Patent Publication Number: US-7589780-B2

Title: Camera and image pick-up device unit used therefor having a sealing structure between a dust-proofing member and an image pick-up device

Description:
The present application is a divisional application of U.S. application Ser. No. 10/300,688, filed Nov. 20, 2002 now U.S. Pat. No. 7,324,148, which claims the benefit of Japanese Applications No. 2002-126724 filed on Apr. 26, 2002, No. 2002-145249 filed on May 20, 2002, No. 2002-145250 filed on May 20, 2002, No. 2002-145253 filed on May 20, 2002, No. 2002-145254 filed on May 20, 2002, No. 2002-153020 filed on May 27, 2002, and No. 2002-153021 filed on May 27, 2002, 
     the entire contents of which are incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an image pick-up device unit having an image pick-up device for obtaining an image signal corresponding to light irradiated on a photoelectrically converting surface or a camera having the image pick-up device unit, such as an interchangeable single-lens reflex digital camera. More particularly, the present invention relates to a camera having a dust-proofing construction of the image pick-up device and image pick-up device unit used for the camera. 
     2. Description of the Related Art 
     Recently, digital cameras such as a so-called digital still camera or a digital video camera (hereinafter, referred to as a digital camera or simply referred to as a camera) are generally put into practical use and are widely spread. In the digital cameras, a construction is such that a subject image formed based on beams (hereinafter, referred to as subject beams) from a subject, which is transmitted through a photographing optical system (also referred to as a photographing lens), is formed onto a photoelectrically converting surface of a solid image pick-up device such as a CCD (Charge Coupled Device, hereinafter, briefly referred to as an image pick-up device), which is arranged at a predetermined position. Further, an electrical image signal or the like indicating a desired subject image is generated by using the photoelectrically converting operation of the image pick-up device. A signal based on the image signal and the like is outputted to a predetermined display device such as an LCD (Liquid Crystal Display) and an image or the like is displayed. Another construction is such that the image signal or the like generated by the image pick-up device is recorded to a predetermined recording area of a predetermined recording medium as predetermined-format image data. Further, the image data recorded to the recording medium is read and the image data is converted to become an image signal which is optimum for displaying the image data using the display device. Thereafter, an image corresponding thereto is displayed based on the processed image signal. 
     In general digital cameras have an optical finder device, so that prior to a photographing operation, a desired subject as a photographing target is observed and a photographing range including the subject is set. 
     In general, a so-called single-lens reflex finder device is used as the optical finder device. In this single-lens reflex finder device, the advancing direction of the subject beams which are transmitted through the photographing optical system is bent by using a reflecting member arranged on the optical axis of the photographing optical system so that a subject image for observation is formed at a predetermined position. On the other hand, upon photographing operation, the reflecting member is evacuated from the optical axis of the photographing optical system, thereby guiding the subject beams onto a light receiving surface, that is, a photoelectrically converting surface and forming the subject image for photographing on the photographically converting surface. 
     Furthermore, recently, a so-called interchangeable lens digital camera having the single-lens reflex finder device is generally put into practical use. In the interchangeable lens digital camera, the photographing optical system is detachable to a camera main body, and a plurality of types of the photographing optical systems are selectively used in the single-camera main body by arbitrarily detaching and exchanging a desired photographing optical system in accordance with user&#39;s desire. 
     In the above-mentioned interchangeable lens digital camera, dust and the like floating in the air enter the camera main body upon detaching the photographing optical system from the camera main body. Various mechanisms which are mechanically operated such as a shutter and stop mechanisms are arranged in the camera main body and thus, the dust is possibly generated from the various mechanisms during the operation. 
     Upon detaching the photographing optical system from the camera main body, the light receiving surface (also referred to as the photoelectrically converting surface) of the image pick-up device arranged in the rear of the photographing optical system is exposed in the ambient air of the camera. Therefore, dust and the like are adhered to the photoelectrically converting surface of the image pick-up device due to electrostatic charge action and the like. 
     Then, for the conventional single-lens reflex digital cameras, for example, Japanese Unexamined Patent Application Publication No. 2000-29132 proposes a technology for suppressing the adhesion of dust and the like to the light receiving surface of the image pick-up device due to the electrostatic charge action. 
     Means disclosed in Japanese Unexamined Patent Application Publication No. 2000-29132 suppresses the adhesion of dust and the like to the light receiving surface of the image pick-up device due to the electrostatic charge action by providing a transparent electrode onto the surface of a cover member for covering the light receiving surface of the image pick-up device provided in the camera and by applying to the transparent electrode a DC voltage or an AC voltage with several kHz to 20 kHz. 
     The means for neutralizing charges generated to the image pick-up device disclosed in the above publication suppresses the adhesion of dust and the like to the light receiving surface of the image pick-up device due to static electricity. 
     On the other hand, as the image pick-up device in the conventional digital cameras, a packaged image pick-up device (e.g., referred to as a packaged CCD) is widely used. In addition to the above-mentioned image pick-up device, recently, the supply of a so-called bare CCD chip is proposed. 
     For example, Japanese Unexamined Patent Application Publication No. 9-130654 discloses means for shaking off dust and the like which are adhered to the photoelectrically converting surface by providing a piezoelectric element between the bare chip CCD and a substrate on which the bare chip CCD is placed and by applying a predetermined voltage to the piezoelectric element, by the reason that dust and the like are, with much possibility, adhered onto the photoelectrically converting surface in the bare chip CCD in many cases. 
     Further, for example, Japanese Unexamined Patent Application Publication No. 2001-298640 proposes means for removing dust and the like adhered to the surface of an optical member such as a low-pass filter arranged in front of the image pick-up device in the conventional interchangeable lens digital cameras. 
     The camera disclosed in Japanese Unexamined Patent Application Publication No. 2001-298640 comprises a wiper member as means for removing the dust and the like adhered to the surface of the optical member arranged in front of the image pick-up device. 
     The wiper member grinds the surface of the optical member such as the low-pass filter and moves on the surface, thereby shaking off dust on the surface of the optical member, thus to remove the dust and the like adhered to the surface of the optical member. The dust and the like grinded by the wiper are put into a groove portion of a camera main body, which is formed near the optical member. 
     However, the means disclosed in Japanese Unexamined Patent Application Publication No. 2000-29132 suppresses the adhesion of dust and the like by neutralizing charges on the electrostatic charged image pick-up device. Consequently, the means is not optimal as means for removing dust which is adhered or deposited, irrespective of the static electricity, to the photoelectrically converting surface of the image pick-up device. 
     Moreover, the means disclosed in Japanese Unexamined Patent Application Publication No. 9-130654 is not the best means for applying to the image pick-up device such as the packaged CCD generally used for the conventional digital cameras because the means is devised in view of the bare chip CCD. 
     In other words, when the means disclosed in Japanese Unexamined Patent Application Publication No. 9-130654 is applied to the general packaged CCD or the like, vibrations to the image pick-up device or the package are applied. Thus, dangerously, the vibrating action adversely influences on various mechanisms which are arranged to the image pick-up device and near it, for example, to cause deterioration or errors. 
     Furthermore, the means disclosed in Japanese Unexamined Patent Application Publication No. 2001-298640 needs a wiper member and a member such as a driving motor for driving the wiper member. The arrangement of the members requires space in the camera. Therefore, there is a problem that the camera itself is increased in size. 
     In addition, with the means disclosed in Japanese Unexamined Patent Application Publication No. 2001-298640, dust and the like shaken off by the wiper member are put into the groove portion formed near the optical member. Dust and the like which are put into the groove portion flow into the space of the camera main body again and might be adhered to inner members of the camera main body such as a mirror unit, a shutter unit, and a lens unit for distance measurement, or might be adhered to the optical member again. 
     In this case, dust and the like adhered to the member are photographed as a part of a captured image or cause inconvenience in the operation of the digital camera. 
     In particular, in the single-lens reflex digital cameras in which the photographing lens is interchangeable, the acquisition of a preferable result (captured image) needs the suppression of the input of dust and the like in the camera main body. Consequently, dust and the like adhered to the optical member provided in the image pick-up device must accurately be removed. However, with the above means disclosed in Japanese Unexamined Patent Application Publication No. 2001-298640, undesirably, removed dust and the like are adhered again. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is a first object of the present invention to provide a digital camera and an assembly (image pick-up device unit) used for the camera that are detachable in a photographing optical system, in which the adhesion of dust and the like to a photoelectrically converting surface of an image pick-up device is substantially prevented and in which dust and the like adhered to an outer surface of a dust-proofing member for sealing and protecting the image pick-up device are surely removed. 
     Further, it is a second object of the present invention to provide a camera and an image pick-up device unit used for the camera in which the structure is simplified, mechanical accuracy is stably ensured, and manufacturing processing is simplified by devising the structure of a dust-proofing mechanism arranged for removing dust and the like adhered to an optical member arranged in the camera. 
     Furthermore, it is a third object of the present invention to provide a camera having the dust-proofing structure for preventing the adhesion of dust and the like to a photoelectrically converting surface of an image pick-up device and an image pick-up device unit used for the camera, in which the structure is simplified and the manufacturing is easy while proposing fixing means contributing to the improvement in fixing force of a dust-proofing member arranged in front of the image pick-up device and assuring a dust proofing function. 
     It is a fourth object of the present invention to provide a camera and an image pick-up device unit, in which the camera comprises means for removing dust and the like adhered to the surface of an optical member arranged in the camera, and whereby it is possible to suppress the re-adhesion or adhesion of dust and the like shaken off from the surface of the optical member to the surface of the optical member or to other internal constituting members. Thus, preferable photographing operation is always maintained, and a preferable photographing result is always obtained. 
     It is a fifth object of the present invention to provide a camera and an image pick-up device unit used for the camera, in which the camera comprises means for removing dust and the like adhered to the surface of an optical member arranged in the camera, and whereby it is possible to suppress the re-adhesion or adhesion of dust and the like shaken off from the surface of the optical member to the surface of the optical member or to other internal constituting members. Thus, preferable photographing operation is always maintained, and a preferable photographing result is always obtained. 
     It is a sixth object of the present invention to provide a camera using an image pick-up device unit having a dust-proofing member for sealing and protecting a photoelectrically converting surface side of an image pick-up device and a member for vibration for applying vibrations with a predetermined amplitude to the dust-proofing member, wherein the attenuation of vibrations of the dust-proofing member is suppressed with a simple structure, the vibrations of the dust-proofing member are stably assured, and dust and the like adhered to the surface of the dust-proofing member are removed easily and surely. 
     It is a seventh object of the present invention to provide a camera having a dust-proofing structure for preventing the adhesion of dust and the like to a photoelectrically converting surface of an image pick-up device and an image pick-up device unit used for the camera, wherein fixing means for fixing and holding without fail a dust-proofing member and a sealing structure arranged in front of the image pick-up device is proposed and the structure is simplified and the manufacturing is easy while accurately ensuring a sealing structure and a dust-proofing function. 
     Briefly, according to a first aspect of the invention, a camera comprises: an image pick-up device which obtains an image signal corresponding to beams irradiated onto a photoelectrically converting surface thereof; an optical device arranged on the photoelectrically converting surface side of the image pick-up device; a dust-proofing member with a circular or polygonal plate-shape as a whole, comprising a transparent portion at an area having at least a predetermined length in a radial direction from the center thereof, opposed to the front side of the optical device at a predetermined interval; a member for vibration arranged at a peripheral portion of the dust-proofing member, which applies vibrations to the dust-proofing member; a sealing structure arranged outside a peripheral portion of the optical device or an adjacent portion thereof, which seals a space portion, that is substantially sealed including a void portion formed by opposing the optical device and the dust-proofing member, on a peripheral side of the optical device and the dust-proofing member; and an image signal processing circuit which converts an image signal obtained from the image pick-up device, corresponding to an image formed onto the photoelectrically converting surface of the image pick-up device, into a signal suitable to recording. 
     According to a second aspect of the invention, a camera comprises: an image pick-up device which obtains an image signal corresponding to beams irradiated onto a photoelectrically converting surface thereof; a dust-proofing member with a circular or polygonal plate-shape as a whole, comprising a transparent portion at an area having at least a predetermined length in a radial direction from the center thereof, opposed to the optical device in front thereof at a predetermined interval; a member for vibration arranged at a peripheral portion of the dust-proofing member, which applies vibrations to the dust-proofing member; a sealing structure arranged outside a peripheral portion of the photoelectrically converting surface of the image pick-up device or an adjacent portion thereof, which seals a space portion, that is substantially sealed including a void portion formed by opposing the photoelectrically converting surface of the image pick-up device and the dust-proofing member, on a peripheral side of the photoelectrically converting surface of the image pick-up device and the dust-proofing member; and an image signal processing circuit which converts an image signal obtained from the image pick-up device, corresponding to an image formed onto the photoelectrically converting surface of the image pick-up device, into a signal suitable to recording. 
     According to a third aspect of the invention, an image pick-up device unit comprises: an image pick-up device which obtains an image signal corresponding to beams irradiated onto a photoelectrically converting surface thereof; an optical member opposed to the front side of the image pick-up device at a predetermined interval; a member for vibration arranged at a peripheral portion of the optical member, which applies vibrations to the optical member; a sealing structure arranged outside a peripheral portion of the photoelectrically converting surface of the image pick-up device to an adjacent portion thereof, which seals a space portion that is substantially sealed at a portion formed by opposing the optical member and the image pick-up device, on a peripheral side of the image pick-up device and the optical member; and a holding structure which presses a peripheral portion of the optical member so as to press and fix the optical member to the sealing structure. 
     The above-mentioned and other objects and benefits of the present invention will be obvious from the following detailed description. 
     That is, according to the present invention, in a camera, in particular, a digital camera, a camera and an assembly used for the camera (image pick-up device unit) are provided, wherein the adhesion of dust and the like onto the photoelectrically converting surface of the image pick-up device is substantially prevented and dust and the like adhered to the outer surface of the dust-proofing member for sealing and protecting the image pick-up device are surely removed. 
     Further, according to the present invention, a camera and an image pick-up device unit used for the camera are provided, wherein the structure is simplified, mechanical accuracy is stably ensured, and manufacturing processing is simplified by devising the structure of the dust-proofing mechanism arranged for removing dust and the like adhered to the optical member arranged in the camera. 
     Furthermore, according to the present invention, there are provided the camera having the dust-proofing structure for preventing the adhesion of dust and the like to the photoelectrically converting surface of the image pick-up device and the image pick-up device unit used for the camera, in which the structure is simplified and the manufacturing is easy while proposing fixing means contributing to the improvement in fixing force of the dust-proofing member arranged in front of the image pick-up device and assuring the dust-proofing function. 
     In addition, according to the present invention, a camera and an image pick-up device unit are provided, wherein the camera comprises means for removing dust and the like adhered to the surface of the optical member arranged in the camera, and wherein it is possible to suppress the re-adhesion of dust and the like shaken off from the surface of the optical member to the surface of the optical member and to suppress the adhesion of dust and the like to another internal member, whereby preferable photographing operation is always maintained, and whereby a preferable photographing result is always obtained. 
     In addition, according to the present invention, a camera and an image pick-up device unit used for the camera are provided, wherein the camera comprises means for removing dust and the like adhered to the surface of the optical member arranged in the camera, and wherein it is possible to suppress the re-adhesion of dust and the like shaken off from the surface of the optical member to the surface of the optical member and to suppress the adhesion of dust and the like to another internal member, whereby preferable photographing operation is always maintained, and whereby a preferable photographing result is always obtained. 
     In addition, according to the present invention, a camera using an image pick-up device unit having the dust-proofing member for sealing and protecting the photoelectrically converting surface of the image pick-up device and the member for vibration for applying vibrations with the predetermined amplitude to the dust-proofing member, and an image pick-up device unit used for the camera, are provided, wherein the attenuation of vibrations of the dust-proofing member is suppressed with the simple structure, the vibrations of the dust-proofing member are stably assured, and dust and the like adhered to the surface of the dust-proofing member are removed easily and surely. 
     In addition, according to the present invention, a camera having the dust-proofing structure for preventing the adhesion of dust and the like onto the photoelectrically converting surface of the image pick-up device and an image pick-up device unit used for the camera are provided, wherein the fixing means for fixing and holding the dust-proofing member and the sealing structure arranged in front of the image pick-up device without fail is proposed and the structure is simplified and the manufacturing is easy while ensuring the sealing structure and the dust-proofing function. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view schematically showing the internal structure of a camera by cutting off a part of the camera according to a first embodiment of the present invention; 
         FIG. 2  is a block diagram schematically showing the main electrical structure of the camera shown in  FIG. 1 ; 
         FIG. 3  is a diagram showing by extracting a part of an image pick-up device unit in the camera shown in  FIG. 1  and a main-part exploded perspective view showing the disassembled image pick-up device unit; 
         FIG. 4  is a perspective view showing a cut-off part of the assembled image pick-up device unit in the camera shown in  FIG. 1 ; 
         FIG. 5  is a sectional view along a cut-off plane of  FIG. 4 ; 
         FIG. 6  is a front view showing only a dust-proofing filter and a piezoelectric element integrated to the dust-proofing filter in the image pick-up device unit in the camera shown in  FIG. 1 ; 
         FIG. 7  is a sectional view along a cut-off line  7 - 7  shown in  FIG. 6 , showing the change in status of the dust-proofing filter and the piezoelectric element upon applying a voltage to the piezoelectric element shown in  FIG. 6 ; 
         FIG. 8  is a sectional view along a cut-off line  8 - 8  shown in  FIG. 6 , showing the change in status of the dust-proofing filter and the piezoelectric element upon applying the voltage to the piezoelectric element shown in  FIG. 6 ; 
         FIG. 9  is a front view showing by extracting only the dust-proofing filter and the picked-up piezoelectric element integrated to the dust-proofing filter in the image pick-up device unit in the camera shown in  FIG. 1 ; 
         FIG. 10  is a sectional view along a cut-off line  10 - 10  shown in  FIG. 9 , showing another example of the change in status in the dust-proofing filter and the piezoelectric element upon applying the voltage to the piezoelectric element shown in  FIG. 9 ; 
         FIG. 11  is a sectional view along a cut-off line  11 - 11  shown in  FIG. 9 , showing another example of the change in status of the dust-proofing filter and the piezoelectric element upon applying the voltage to the piezoelectric element shown in  FIG. 9 ; 
         FIG. 12  is a view showing by extracting a part of an image pick-up device unit in a camera according to a second embodiment of the present invention, and is a perspective view showing a cut-off part of the assembled image pick-up device unit; 
         FIG. 13  is a sectional view along a cut-off plane shown in  FIG. 12 ; 
         FIG. 14  is a diagram showing by extracting a part of an image pick-up device unit in a camera according to a third embodiment of the present invention, and is a perspective view showing a cut-off part of the assembled image pick-up device unit; 
         FIG. 15  is a sectional view along a cut-off plane shown in  FIG. 14 ; 
         FIG. 16  is a diagram showing by extracting a part of members forming an image pick-up device unit in a camera according to a fifth embodiment of the present invention, and is a front view showing a dust-proofing filter supporting member (first member) in the members forming the image pick-up device unit; 
         FIG. 17  is an exploded perspective view showing a dust-filter supporting member and a dust-proofing filter (dust-proofing member) in the members forming the image pick-up device unit shown in  FIG. 16 ; 
         FIG. 18  is a sectional view at a position along a cut-off line  18 - 18  shown in  FIG. 16  when the dust-proofing filter supporting unit shown in  FIG. 17  is adhered to the dust-proofing filter by an adhesion; 
         FIG. 19  is a sectional view schematically showing by extracting a part of the image pick-up device unit when forming a sealing space in which the dust-proofing filter and a predetermined member for assisting the dust-proofing filter completely seal the front side of the image pick-up device from the outside (according to the first embodiment), and showing a state in which no voltage is applied to the piezoelectric element; 
         FIG. 20  is a sectional view showing a state in which a positive voltage is applied to the piezoelectric element in the image pick-up device unit shown in  FIG. 19 ; 
         FIG. 21  is a sectional view showing a state in which a negative voltage is applied to the piezoelectric element in the image pick-up device unit shown in  FIG. 19 ; 
         FIG. 22  is a diagram showing by extracting a part of members forming an image pick-up device unit in a camera according to a sixth embodiment of the present invention, and a perspective view showing a CCD case (second member) in the members of the image pick-up device unit; 
         FIG. 23  is a sectional view at a position along a line  23 - 23  shown in  FIG. 22 ; 
         FIG. 24  is a perspective view showing by extracting a part of members forming an image pick-up device unit in a camera according to a seventh embodiment of the present invention, showing by extracting a CCD case (second member) of the members forming the image pick-up device unit; 
         FIG. 25  is a sectional view at a position along a line  25 - 25  shown in  FIG. 24 ; 
         FIG. 26  is a perspective view showing by extracting a part of members forming an image pick-up device unit in a camera according to an eighth embodiment of the present invention, showing by extracting a dust-proofing supporting member (first member) of the members forming the image pick-up device unit; 
         FIG. 27  is a sectional view at a position along a line  27 - 27  shown in  FIG. 26 ; 
         FIG. 28  is a perspective view showing by extracting a part of members forming an image pick-up device unit in a camera according to a ninth embodiment of the present invention, showing by extracting the back side of a CCD case (second member) of the members forming the image pick-up device unit; 
         FIG. 29  is a sectional at a position along a line  29 - 29  shown in  FIG. 28 ; 
         FIG. 30  is a perspective view showing by extracting a part of members forming an image pick-up device unit in a camera according to a tenth embodiment of the present invention, showing by extracting the back side of a CCD case (second member) of the members forming the image pick-up device unit; 
         FIG. 31  is a sectional view at a position along a line  31 - 31  shown in  FIG. 30 ; 
         FIG. 32  is a perspective view showing by extracting a part of members forming an image pick-up device unit in a camera according to an eleventh embodiment of the present invention; 
         FIG. 33  is a sectional view along a line  33 - 33  shown in  FIG. 32 ; 
         FIG. 34  is a perspective view showing by extracting a part of members forming an image pick-up device unit in a camera according to a twelfth embodiment of the present invention; 
         FIG. 35  is a sectional view along a line  35 - 35  shown in  FIG. 34 ; 
         FIG. 36  is a diagram showing by extracting a part of an image pick-up device unit in a camera according to a thirteenth embodiment of the present invention, showing by extracting a main-part exploded perspective view showing the disassembled image pick-up device unit; 
         FIG. 37  is a diagram showing by extracting a part of the image pick-up device unit in a camera according to a fourteenth embodiment of the present invention, showing by extracting a front view showing a dust-proofing filter supporting member of the image pick-up device unit; 
         FIG. 38  is an exploded perspective view showing a dust-proofing supporting member and a dust-proofing filter of the image pick-up device unit shown in  FIG. 37 ; 
         FIG. 39  is a sectional view at a position along a line  39 - 39  shown in  FIG. 37 ; 
         FIG. 40  is a diagram showing by extracting a part of an image pick-up device unit in a camera according to a fifteenth embodiment of the present invention, specifically, a perspective view showing the adhesion of a dust-proofing filter to a dust-proofing supporting member in the image pick-up device unit; 
         FIG. 41  is a sectional view along a line  41 - 41  shown in  FIG. 40 ; 
         FIG. 42  is a diagram showing by extracting a part of an image pick-up device unit in a camera according to a sixteenth embodiment of the present invention, specifically, a main-part exploded perspective view showing the disassembled image pick-up device unit; 
         FIG. 43  is a perspective view showing a cut-off part when the image pick-up device unit shown in  FIG. 42  is assembled; 
         FIG. 44  is a sectional view along a cut-off plane shown in  FIG. 43 ; 
         FIG. 45  is a main-part exploded perspective view including a cut-off plane when a part of the image pick-up device unit shown in  FIG. 42  is cut off; 
         FIG. 46  is a diagram showing by extracting a part of an image pick-up device unit in a camera according to a seventeenth embodiment of the present invention, specifically, a main-part perspective view showing the assembled image pick-up device unit; 
         FIG. 47  is an exploded perspective view showing by extracting a dust-proofing filter supporting member and a dust-proofing filter among the members forming the image pick-up device unit shown in  FIG. 46 ; 
         FIG. 48  is a front view showing by extracting a part of the image pick-up device unit shown in  FIG. 46 ; 
         FIG. 49  is a sectional view along a line  49 - 49  shown in  FIG. 48 ; 
         FIG. 50  is a diagram showing by extracting a part of an image pick-up device unit in a camera according to an eighteenth embodiment of the present invention, specifically, a perspective view showing the assembled image pick-up device unit; 
         FIG. 51  is a sectional view showing by extracting a part of an image pick-up device unit shown in  FIG. 50 ; 
         FIG. 52  is a main-part enlarged perspective view including a cut-off plane when a part of the image pick-up device unit shown in  FIG. 50  is cut off; 
         FIG. 53  is a diagram showing by extracting a part of an image pick-up device unit in a camera according to a nineteenth embodiment of the present invention, specifically, main-part exploded perspective view showing the disassembled image pick-up device unit; 
         FIG. 54  is a perspective view showing a cut-off part of the image pick-up device unit shown in  FIG. 53  when it is assembled; 
         FIG. 55  is a perspective view showing an assembling state of the image pick-up device unit shown in  FIG. 53 ; 
         FIG. 56  is a sectional view along a line  56 - 56  shown in  FIG. 55 ; 
         FIG. 57  is a perspective view showing by extracting only a dust-proofing filter supporting member among the members forming the image pick-up device unit shown in  FIG. 53 ; 
         FIG. 58  is a main-part enlarged sectional view showing the enlarged structure near a dust receiving unit in the image pick-up device unit applied to a camera according to a twentieth embodiment of the present invention; 
         FIG. 59  is a diagram showing by extracting a part of an image pick-up device unit in a camera according to a twenty-first embodiment of the present invention, specifically, a main-part exploded perspective view showing the disassembled image pick-up device unit; 
         FIG. 60  is a perspective view showing a cut-off part of the image pick-up device unit shown in  FIG. 59  when it is assembled; 
         FIG. 61  is a sectional view along a cut-off plane shown in  FIG. 60 ; 
         FIG. 62  is a perspective view showing a cut-off part upon assembling a part of an image pick-up device unit (main body unit of a sealing structure and a dust-proofing filter supporting member), a dust-proofing filter, and a piezoelectric element in a camera according to a twenty-second embodiment of the present invention; 
         FIG. 63  is a sectional view along a line  63 - 63  shown in  FIG. 62 ; 
         FIG. 64  is a perspective view showing an image pick-up device unit in a camera according to a twenty-third embodiment of the present invention; 
         FIG. 65  is a sectional view along a line  65 - 65  shown in  FIG. 64 ; 
         FIG. 66  is a perspective view of an enlarged portion near a contact portion between a main body of a sealing structure (dust-proofing filter supporting member) and a dust-proofing member (dust-proofing filter) in the image pick-up device unit shown in  FIG. 64 ; 
         FIG. 67  is a sectional view of an image pick-up device unit in a camera according to a twenty-fourth embodiment of the present invention, specifically, a sectional view showing a normal status in which no voltage is applied to a piezoelectric element in the image pick-up device unit; 
         FIG. 68  is a sectional view showing the image pick-up device unit shown in  FIG. 67 , specifically, a sectional view showing a status in which either of a positive voltage or a negative voltage is applied to the piezoelectric element in the image pick-up device unit shown in  FIG. 67 ; 
         FIG. 69  is a sectional view showing an image pick-up device unit shown in  FIG. 67 , specifically, a sectional view showing a status in which either of the negative voltage or the positive voltage is applied to the piezoelectric element in the image pick-up device unit; 
         FIG. 70  is a main-part exploded perspective view showing a disassembled image pick-up device unit in a camera according to a twenty-fifth embodiment of the present invention; 
         FIG. 71  is a perspective view showing an enlarged portion near a contact portion between a main body unit of a sealing structure (dust-proofing supporting member) and a dust-proofing member (dust-proofing filter) in the image pick-up device unit shown in  FIG. 70 ; 
         FIG. 72  is a diagram showing by extracting a part of an image pick-up device unit in a camera according to a twenty-sixth embodiment of the present invention, specifically, a main-part exploded perspective view showing the disassembled image pick-up device unit; 
         FIG. 73  is a main-part enlarged perspective view showing an enlarged part (an attaching portion of a pressing member and a dust-proofing member) in the image pick-up device unit shown in  FIG. 72 ; 
         FIG. 74  is a main-part exploded perspective view showing a disassembled image pick-up device unit in a camera according to a twenty-seventh embodiment of the present invention; 
         FIG. 75  is a main-part enlarged sectional perspective view showing an enlarged cross-section of a part (an attaching portion of a dust-proofing member and a pressing member) of the image pick-up device unit shown in  FIG. 74 ; 
         FIG. 76  is a main-part exploded perspective view showing a disassembled image pick-up device unit in a camera according to a twenty-eighth embodiment of the present invention; 
         FIG. 77  is a main-part enlarged sectional perspective view showing an enlarged cross-section of a part (an attaching portion of a dust-proofing member and a pressing member) of the image pick-up device unit shown in  FIG. 76 ; 
         FIG. 78  is a main-part exploded perspective view showing a disassembled image pick-up device unit in a camera according to a twenty-ninth embodiment of the present invention; 
         FIG. 79  is a perspective view showing an assembling status of the image pick-up device unit shown in  FIG. 78 ; 
         FIG. 80  is a sectional view along a line  80 - 80  shown in  FIG. 79 ; 
         FIG. 81  is a perspective view showing a status of assembling a pressing member to the image pick-up device unit shown in  FIG. 78 ; 
         FIG. 82  is a main-part enlarged sectional perspective view showing an enlarged cross-section of a part (an attaching portion of a dust-proofing member and a pressing member) of the image pick-up device unit shown in  FIG. 78 ; 
         FIG. 83  is a main-part enlarged sectional perspective view showing an enlarged cross-section of a part (an attaching portion of a dust-proofing member and a pressing member) of an image pick-up device unit in a camera according to a thirtieth embodiment of the present invention; 
         FIG. 84  is a main-part enlarged sectional perspective view showing an enlarged cross-section of a part (an attaching portion of a dust-proofing member and a pressing member) of an image pick-up device unit in a camera according to a thirty-first embodiment of the present invention; 
         FIG. 85  is a perspective view schematically showing an image pick-up device unit in a camera according to a thirty-third embodiment of the present invention; 
         FIG. 86  is a main-part enlarged exploded perspective view showing an enlarged status of a pressing member and a pressing member fixing unit in the image pick-up device unit shown in  FIG. 85 ; 
         FIG. 87  is an operation diagram showing one procedure for attaching and fixing the pressing member to the pressing member fixing unit shown in  FIG. 85 ; 
         FIG. 88  is an operation diagram showing another procedure for attaching and fixing the pressing member to the pressing member fixing unit shown in  FIG. 85 ; 
         FIG. 89  is a main-part enlarged exploded perspective view showing a pressing member and a pressing member fixing unit according to a thirty-fourth embodiment of the present invention; 
         FIG. 90  is a main-part enlarged exploded perspective view showing a pressing member and a pressing member fixing unit according to a thirty-fifth embodiment of the present invention; 
         FIG. 91  a sectional view showing by extracting only a pressing member according to a thirty-sixth embodiment of the present invention; 
         FIG. 92  is a sectional view showing by extracting only a pressing member according to a thirty-seventh embodiment of the present invention; 
         FIG. 93  is a sectional view showing by extracting only a pressing member according to a thirty-eighth embodiment of the present invention; 
         FIG. 94  is a main-part enlarged sectional view showing an enlarged part of an image pick-up device unit in which the pressing member shown in  FIG. 93  is applied; and 
         FIG. 95  is a perspective view showing by extracting only a pressing member according to a thirty-ninth embodiment of the present invention. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     First, a description is given of the schematic structure of a camera according to a first embodiment of the present invention. 
       FIGS. 1 and 2  are diagrams showing the schematic structure of the camera according to the first embodiment of the present invention.  FIG. 1  is a perspective view schematically showing the internal structure of a cut-off part of the camera, and  FIG. 2  is a block diagram schematically mainly showing the electrical structure of the camera. 
     According to the first embodiment, a camera  1  comprises a camera main body unit  11  and a lens barrel  12  which are provided independently. The camera main body unit  11  and the lens barrel  12  are detachable. 
     The lens barrel  12  holds a photographing optical system (photographing lenses)  12   a  comprising a plurality of lenses and a driving mechanism of the lenses. The photographing optical system  12   a  comprises a plurality of optical lenses through which a subject beams are transmitted so as to form the subject image generated by the subject beams at a predetermined position (on a photoelectrically converting surface of an image pick-up device  27 , which will be described later). The lens barrel  12  is projected toward the front side of the camera main body unit  11 . 
     The lens barrel  12  is a common one used in conventional cameras. Therefore, a description of the detailed structure is omitted. 
     The camera main body unit  11  is a so-called single-lens reflex camera comprising various members therein, and further having in its front a photographing optical system mounting unit (referred to as a photographing lens mounting unit)  11   a  as a connecting member arranging detachably the lens barrel  12  for holding a photographing optical system  12   a.    
     In other words, an opening for exposure having a predetermined diameter for guiding the subject beams into the camera main body unit  11  is formed substantially in the center in front of the camera main body unit  11 . The photographing optical system mounting unit  11   a  is formed at a peripheral portion of the opening for exposure. 
     The above-mentioned photographing optical system mounting unit  11   a  is arranged in front of an outer-surface side of the camera main body unit  11 . In addition, various operating members for operating the camera main body unit  11 , e.g., a release button  17  and the like for generating an instruction signal to start the photographing operation are arranged at a predetermined position on an upper-surface portion or a back-surface portion of the outer-surface side of the camera main body unit  11 . Since the operating members do not directly relate to the present invention, a description and an illustration of the operating members except for the release button  17  are omitted for the purpose of preventing the complication of the drawing. 
     Referring to  FIG. 1 , in the camera main body unit  11 , various members are arranged at predetermined positions. For example, the camera main body unit  11  comprises: a finder device  13  forming a so-called observation optical system that is provided for forming a desired subject image formed by the photographing optical system  12   a  at a predetermined position different from that on the photoelectrically converting surface of the image pick-up device  27  (refer to  FIG. 2 ); a shutter unit  14  having a shutter mechanism and the like for controlling an irradiation time and the like of the subject beams onto the photoelectrically converting surface of the image pick-up device  27 ; an image pick-up device unit  15  as an assembly of the image pick-up device  27 , including the shutter unit  14 , for obtaining an image signal corresponding to the subject image formed based on the subject beams which are transmitted through the photographing optical system  12   a , and a dust-proofing filter  21  (which will be described in detail later) having optical members, etc., as a dust-proofing member for preventing the adhesion of dust and the like to the photoelectrically converting surface, arranged at a predetermined position in front of the photoelectrically converting surface of the image pick-up device  27 ; and a plurality of circuit boards (only a main circuit board  16  is illustrated in  FIG. 1 ) such as a main circuit board  16  on which various electrical members forming an electrical circuit, e.g., an image signal processing circuit  16   a  (refer to  FIG. 2 ) for various signal processing to the image signal obtained by the image pick-up device  27 , are mounted. 
     The finder device  13  comprises a reflecting mirror  13   b  for bending and guiding an optical axis of the subject beams transmitted through the photographing optical system  12   a  to an observation optical system side, a roof prism  13   a  for receiving the beams outputted from the reflecting mirror  13   b  to form an erecting image, an ocular lens  13   c  for enlarging the image formed by the roof prism  13   a  to form an image best for observation, and the like. 
     The reflecting mirror  13   b  is movable between a position evacuated from the optical axis of the photographing optical system  12   a  and a predetermined position on the optical axis, and is arranged at a predetermined angle, e.g., 45° with respect to the optical axis thereof of the photographing optical system  12   a  in a normal status. Thus, the optical axis of the subject beams transmitted through the photographing optical system  12   a  is bent by the reflecting mirror  13   b  when the camera  1  is in the normal status, and is reflected to the roof prism  13   a  arranged at an upper position of the reflecting mirror  13   b.    
     Upon executing the photographing operation of the camera  1 , the reflecting mirror  13   b  is moved to a predetermined position evacuated from the optical axis of the photographing optical system  12   a  during the actual exposure operation. Consequently, the subject beams are guided to the side of the image pick-up device  27  and irradiate the photoelectrically converting surface. 
     The shutter unit  14  uses a focal plane type shutter mechanism, driving circuit for controlling the operation of the shutter mechanism, etc. which are similar to those generally used in the conventional cameras. Therefore, a description of the detailed structure is omitted. 
     As mentioned above, a plurality of circuit boards arranged in the camera  1  form various electrical circuits. Referring to  FIG. 2 , as the electrical structure, the camera  1  comprises a CPU  41  as a control circuit for wholly controlling the entire camera  1 , the image signal processing circuit  16   a  for performing various signal processing such as signal processing for converting the image signal obtained by the image pick-up device  27  to a signal suitable to a recording format, a work memory  16   b  for temporarily recording the image signal processed by the image signal processing circuit  16   a , image data, and various information in associated therewith, a recording medium  43  for recording the image data for recording in a predetermined format generated by the image signal processing circuit  16   a  to a predetermined area, a recording medium interface  42  for electrically connecting the recording medium  43  to the electrical circuits of the camera  1 , a display unit  46  comprising a liquid crystal display device (LCD) for displaying the image, a display circuit  47  for electrically connecting the display unit  46  to the camera  1 , receiving the image signal processed by the image signal processing circuit  16   a , and generating an image signal optimal to display the display operation by using the display unit  46 , a battery  45  comprising a secondary battery such as a dry cell, a power supply circuit  44  for receiving power from the battery  45  or from external power supply (AC) supplied by a predetermined connection cable (not shown), controlling the power to match the operation of the camera  1 , and supplying electricity to the electrical circuits, a dust-proofing driving unit  48  as the electrical circuit for driving the dust-proofing filter  21  included in the image pick-up device unit  15 , comprising an oscillator, and the like. 
     Next, a detailed description is given of the image pick-up device unit  15  in the camera  1  according to the first embodiment. 
       FIGS. 3 to 5  are diagrams showing by extracting a part of the image pick-up device unit in the camera  1  according to the first embodiment.  FIG. 3  is a main-part exploded perspective view showing the schematic structure of the disassembled image pick-up device unit.  FIG. 4  is a perspective view showing a cut-off part of the assembled image pick-up device unit.  FIG. 5  is a sectional view along a cut-off plane. 
     According to the first embodiment, the image pick-up device unit  15  in the camera  1  is a unit comprising a plurality of members including the shutter unit  14  as mentioned above. However, referring to  FIGS. 3 to 5 , the main portion is only shown and an illustration of the shutter unit  14  is omitted. 
     Referring to  FIGS. 3 to 5 , for the purpose of showing a positional relationship of the members, being the image pick-up device  27  loaded and provided near the image pick-up device unit  15 , a main circuit board  16  on which the image pick-up system electrical circuits comprising the image signal processing circuit  16   a  and the work memory  16   b  are mounted is illustrated. 
     The main circuit board  16  is one of main circuit boards generally used in the conventional cameras, and a detailed description thereof is omitted. 
     The image pick-up device unit  15  comprises: the image pick-up device  27  comprising the CCD and the like, which obtains the image signal corresponding to the light transmitted through the photographing optical system  12   a  and irradiated to the photoelectrically converting surface thereof; an image pick-up device fixing plate  28  comprising a thin-sheet member for fixing and supporting the image pick-up device  27 ; an optical low-pass filter (hereinafter, referred to as an optical LPF)  25  arranged on the side of the photoelectrically converting surface of the image pick-up device  27 , as an optical device which is formed to remove high frequency components from the subject beams transmitted and irradiated through the photographing optical system  12   a ; a low-pass filter supporting member  26  provided in the periphery between the optical LPF  25  and the image pick-up device  27 , which is made of substantially frame-shaped elastic members; an image pick-up device accommodating case member  24  (a second member which will be described later, hereinafter, referred to as a CCD case  24 ) which accommodates, fixes, and holds the image pick-up device  27 , supports the optical LPF  25  (optical device) in contact with a peripheral portion or an adjacent portion of the optical LPF  25 , and which comes into closely contact with a dust-proofing filter supporting member  23  (first member described later) constituting a part of a sealing structure at a predetermined portion; the dust-proofing filter supporting member  23  (first member) which comes into contact with a dust-proofing filter  21  (dust-proofing member) arranged in front of the CCD case  24  at a peripheral portion or an adjacent portion thereof and supports it; the dust-proofing filter  21  as an optical member and a dust-proofing member, opposed and arranged to the front of the optical LPF  25  at a predetermined position having a predetermined interval on the photoelectrically converting surface side of the image pick-up device  27 , which is supported by the dust-proofing filter supporting member  23 ; the piezoelectric element  22  arranged to a surface opposed to the image pick-up device  27  at a peripheral portion of the dust-proofing filter  21 , as a member for vibration for applying predetermined vibrations to the dust-proofing filter  21 , comprising an electromechanical transducer such as piezoelectric ceramics; a pressing member  20  comprising an elastic member which airtightly joints the dust-proofing filter  21  to the dust-proofing filter supporting member  23 , and the like. 
     The image pick-up device  27  obtains the image signal corresponding to the subject image formed onto the photoelectrically converting surface thereof by receiving the subject beams transmitted through the photographing optical system  12   a  onto the photoelectrically converting surface thereof and by performing photoelectrically converting processing, and uses, e.g., a CCD (Charge Coupled Device). 
     The image pick-up device  27  is mounted at a predetermined position on the main circuit board  16  with the image pick-up device fixing plate  28  interposed therebetween. As mentioned above, the image signal processing circuit  16   a , the work memory  16   b , etc. are mounted on the main circuit board  16  so that an output signal from the image pick-up device  27 , that is, the image signal obtained by the photoelectrically converting processing is electrically transmitted to the image signal processing circuit  16   a  or the like. 
     The signal processing in the image signal processing circuit  16   a  includes various signal processing, for example, processing in which the image signal obtained from the image pick-up device  27  is converted, by the photographing optical system  12   a  held in the lens barrel  12  loaded to the photographing optical system mounting unit  11   a , into a signal matching the recording, corresponding to the image formed onto the photoelectrically converting surface of the image pick-up device  27 . The above-mentioned signal processing is the same as processing for treating a digital image signal, which is usually performed in the general digital cameras. Therefore, a detailed description of various signal processing which is usually executed in the camera  1  is omitted. 
     The optical LPF  25  is arranged in front of the image pick-up device  27  via the low-pass filter supporting member  26  interposed. The CCD case  24  is arranged to cover the optical LPF  25 . 
     That is, an opening  24   c  which is rectangular-shaped is provided substantially in the center for the CCD case  24 . The optical LPF  25  and the image pick-up device  27  are arranged from the back side of the opening  24   c . Referring to  FIGS. 4 and 5 , a step portion  24   a  whose cross section is substantially L-shaped is formed at an inner peripheral portion of the back side of the opening  24   c.    
     As mentioned above, the low-pass filter supporting member  26  made of the elastic member or the like is arranged between the optical LPF  25  and the image pick-up device  27 . In the peripheral portion in front of the image pick-up device  27 , the low-pass filter supporting member  26  is arranged within a valid range of the photoelectrically converting surface, in other words, at a position for evacuating the valid beams incident on the image pick-up device  27 , and is abutted onto an adjacent portion of the periphery behind the optical LPF  25 . The airtightness is substantially held between the optical LPF  25  and the image pick-up device  27 . Thus, elastic force generated by the low-pass filter supporting member  26  acts to the optical LPF  25  in the optical axis direction. 
     Then, the peripheral portion in front of the optical LPF  25  airtightly comes into contact with the step portion  24   a  of the CCD case  24 . Thus, the position of the optical LPF  25  in the optical axis direction is regulated against the elastic force which is generated by the low-pass filter supporting member  26  and which displaces the optical LPF  25  in the optical axis direction. 
     In other words, the optical LPF  25  inserted from the back side in the opening  24   c  of the CCD case  24  is subjected to the position regulation in the optical direction by using the step portion  24   a . Consequently, it is possible to prevent the optical LPF  25  from breaking away from the inside of the CCD case  24  to the front side. 
     As mentioned above, after inserting the optical LPF  25  in the opening  24   c  of the CCD case  24  from the back side, the image pick-up device  27  is arranged on the back side of the optical LPF  25 . In this case, the low-pass filter supporting member  26  is sandwiched between the optical LPF  25  and the image pick-up device  27  in the peripheral portion of the low-pass filter supporting member  26 . 
     As mentioned above, the image pick-up device  27  is mounted on the main circuit board  16  via the image pick-up device fixing plate  28  interposed. The image pick-up device fixing plate  28  is fixed to a screw hole  24   e  from the back of the CCD case  24  via a spacer  28   a  interposed by a screw  28   b . The main circuit board  16  is fixed to the image pick-up device fixing plate  28  via a spacer  16   c  interposed by a screw  16   d.    
     In front of the CCD case  24 , the dust-proofing filter supporting member  23  is fixed to the screw hole  24   b  of the CCD case  24  by a screw  23   b . In this case, a circumferential groove  24   d  is substantially annularly formed at a predetermined position in front of the CCD case  24  in the peripheral side thereof, as will be described in detail in  FIGS. 4 and 5 . On the other hand, at a predetermined position on the back and the peripheral side of the dust-proofing filter supporting member  23 , an annular convex portion  23   d  (not shown in  FIG. 3 ) corresponding to the circumferential groove  24   d  of the CCD  24  is formed throughout the circumference with a substantially annular shape. By fitting the annular convex portion  23   d  to the circumferential groove  24   d , the CCD case  24  is airtightly fit to the dust-proofing filter supporting member  23  in an annular area, that is, in an area in which the circumferential groove  24   d  and the annular convex portion  23   d  are formed. 
     The dust-proofing filter  21  is circularly or polygonally plate-shaped as a whole, and at least an area having a predetermined spread in a radial direction from the center of the dust-proofing filter  21  forms a transparent portion. The transparent portion is opposed and arranged to the front of the optical LPF  25  at a predetermined interval. The transparent portion is formed such that the valid beams incident on the photoelectrically converting surface of the image pick-up device  27  from the photographing optical system  12   a  (photographing lens) can be transmitted. 
     At a peripheral portion of one surface (back surface according to the first embodiment) of the dust-proofing filter  21 , integrally therewith, the piezoelectric element  22  formed annularly and including an electromechanical transducer and the like, is integrally arranged therewith as a predetermined member for vibration for applying the vibrations to the dust-proofing filter  21 , by means of adhesion using an adhesive. The piezoelectric element  22  is constituted so as to generate predetermined vibrations in the dust-proofing filter  21  by applying a predetermined driving voltage from the outside. 
     The dust-proofing filter  21  is fixed and held by the pressing member  20  made of the elastic member such as a plate-shaped spring so as to airtightly joint to the dust-proofing filter supporting member  23 . 
     A circular or polygonal opening  23   f  is provided substantially in the center of the dust-proofing filter supporting member  23 . Through the opening  23   f , the subject beams which are transmitted through the photographing optical system  12   a  pass, and the opening  23   f  has a size large enough to irradiate the photoelectrically converting surface of the image pick-up device  27  at the back. 
     A wall portion  23   e  (refer to  FIGS. 4 and 5 ) projecting in front is annularly formed at a peripheral portion of the opening  23   f . Further, a supporting portion  23   c  is formed so that it projects towards the front side at the edge of the wall portion  23   e.    
     A plurality of projecting portions  23   a  (three projecting portions according to the first embodiment) with an almost rectangular shape are formed to project toward the front side, near an outer peripheral portion in front of the dust-proofing filter supporting member  23 . The projecting portion  23   a  is a portion formed to fix the pressing member  20  for fixing and holding the dust-proofing filter  21 . The pressing member  20  is fixed by fastening means such as a fixing screw  20   a  to the edge of the projecting portions  23   a . That is, the projecting portion  23   a  is a supporting member for attaching the pressing member  20 . 
     The pressing member  20  is a member made of the elastic member such as a plate spring, and a base end portion of the pressing member  20  is fixed to the projecting portions  23   a . Further, a free end portion thereof is abutted on an outer peripheral portion of the dust-proofing filter  21 , thereby pressing the dust-proofing filter  21  toward the side of the dust-proofing filter supporting member  23 , that is, in the optical axis direction. 
     In this case, a predetermined portion of the piezoelectric element  22  arranged at the outer peripheral portion at the back of the dust-proofing filter  21  is abutted to the supporting portion  23   c , thereby regulating the positions of the dust-proofing filter  21  and the piezoelectric element  22  in the optical axis direction. Therefore, the dust-proofing filter  21  is fixed and held to airtightly come into contact with the dust-proofing filter supporting member  23  with the piezoelectric element  22  interposed therebetween. 
     In other words, the dust-proofing filter supporting member  23  is airtightly jointed to the dust-proofing filter  21  via the interposed piezoelectric element  22  by a pressing force generated by the pressing member  20 . 
     As mentioned above, with respect to the dust-proofing filter supporting member  23  and the CCD case  24 , the circumferential groove  24   d  and the annular convex portion  23   d  (refer to  FIGS. 4 and 5 ) are airtightly fixed. Further, the dust-proofing filter supporting member  23  is airtightly jointed to the dust-proofing filter  21  via the piezoelectric element  22  interposed by the pressing force generated by the pressing member  20 . 
     The optical LPF  25  arranged to the CCD case  24  is airtightly arranged between the peripheral portion in front of the optical LPF  25  and the step portion  24   a  of the CCD case  24 . Further, the image pick-up device  27  is arranged at the back of the optical LPF  25  via the low-pass filter supporting member  26  interposed. The airtightness is substantially held between the optical LPF  25  and the image pick-up device  27 . 
     Therefore, in a space formed by opposing the optical LPF  25  and the dust-proofing filter  21 , a predetermined void portion  51   a  is formed. A space portion  51   b  is formed at the peripheral side of the optical LPF  25 , that is, formed by the CCD case  24 , the dust-proofing filter supporting member  23 , and the dust-proofing filter  21 . The space portion  51   b  is a sealed space formed to project toward the outside of the optical LPF  25  (refer to  FIGS. 4 and 5 ). Further, the space portion  51   b  is set to be wider than the void portion  51   a . A space containing the void portion  51   a  and the space portion  51   b  constitutes a sealing space  51  which is substantially airtightly sealed by the CCD case  24 , the dust-proofing filter supporting member  23 , the dust-proofing filter  21 , and the optical LPF  25  as mentioned above. 
     As mentioned above, according to the first embodiment, the image pick-up device unit  15  in the camera is constituted by the sealing structure forming the sealing space  51  which includes the void portion  51   a  and substantially sealed and the sealing structure is formed in the periphery of the optical LPF  25  and the dust-proofing filter  21 . 
     According to the first embodiment, the sealing structure further comprises the dust-proofing filter supporting member  23  as the first member for supporting the dust-proofing filter  21  in contact with the peripheral portion or the adjacent portion thereof, and the CCD case  24  as the second member which supports the optical LPF  25  in contact with area of the peripheral portion or the adjacent portion thereof and which is arranged airtightly in contact with the dust-proofing filter supporting member  23  (first member) at the predetermined portion of the CCD case  24 . 
     According to the first embodiment, in the camera with the above-mentioned structure, the dust-proofing filter  21  is opposed at a predetermined position to the front of the image pick-up device  27 , and the sealing space  51  at the periphery of the photoelectrically converting surface of the image pick-up device  27  and the dust-proofing filter  21  is sealed. Consequently, the adhesion of dust, etc. to the photoelectrically converting surface of the image pick-up device  27  is prevented. 
     By applying a periodic voltage to the piezoelectric element  22  arranged integrally with the periphery portion of the dust-proofing filter  21  and by applying predetermined vibrations to the dust-proofing filter  21 , dust and the like to be adhered to the exposure surface in front of the dust-proofing filter  21  are removed. 
       FIG. 6  is a front view showing by extracting only the dust-proofing filter  21  and the piezoelectric element  22  arranged integrally therewith in the image pick-up device unit  15  in the camera  1 .  FIGS. 7 and 8  shows the change in status of the dust-proofing filter  21  and the piezoelectric element  22  upon applying the driving voltage to the piezoelectric element  22  shown in  FIG. 6 , in which  FIG. 7  is a sectional view along a line  7 - 7  shown in  FIG. 6 , and  FIG. 8  is a sectional view along a line  8 - 8  shown in  FIG. 6 . 
     When a negative (−) voltage is applied to the piezoelectric element  22 , the dust-proofing filter  21  is modified as shown by a solid line in  FIGS. 7 and 8 . On the other hand, when a positive (+) voltage is applied to the piezoelectric element  22 , the dust-proofing filter  21  is modified as shown by a dotted line in  FIGS. 7 and 8 . 
     In this case, the amplitude is substantially equal to zero at a node position of the vibration as shown by reference symbols  21   a  shown in  FIGS. 6 to 8 . Thus, the supporting portion  23   c  of the dust-proofing filter supporting member  23  is abutted to a portion corresponding to the node  21   a . Consequently, the dust-proofing filter  21  is efficiently supported without reducing the vibrations. 
     In this status, the CPU  41  controls the dust-proofing filter driving unit  48  (refer to  FIG. 2 ) at a predetermined timing and applies the periodic voltage to the piezoelectric element  22 , thereby vibrating the dust-proofing filter  21 . Thus, it is possible to remove the dust and the like which are adhered to the surface of the dust-proofing filter  21 . 
     A resonant frequency in this case is determined depending on the plate thickness, the material, and the shape of the dust-proofing filter  21 . In one example shown in  FIGS. 6 to 8 , a first-degree vibration is generated and the present invention is not limited to this. However, a high-degree vibration may be generated. 
     In another example shown in  FIGS. 9 to 11 , a second-degree vibration is generated to the dust-proofing filter with the same structure as that in the one example shown in  FIGS. 6 to 8 . 
     In this case,  FIG. 9  is a front view showing by extracting only the dust-proofing filter  21  and the piezoelectric element  22  integrally arranged to the dust-proofing filter  21  in the image pick-up device unit  15  in the camera  1 , similarly to the example shown in  FIG. 6 .  FIGS. 10 and 11  show the change in status of the dust-proofing filter  21  and the piezoelectric element  22  when the voltage is applied to the piezoelectric element  22  shown in  FIG. 9 , in which  FIG. 10  is a sectional view along a line  10 - 10  shown in  FIG. 9 , and  FIG. 11  is a sectional view along a line  11 - 11  shown in  FIG. 9 . 
     Herein, when a negative (−) voltage is applied to the piezoelectric element  22 , the dust-proofing filter  21  is modified as shown by a solid line in  FIGS. 10 and 11 . On the other hand, when a positive (+) voltage is applied to the piezoelectric element  22 , the dust-proofing filter  21  is modified as shown by a dotted line in  FIGS. 10 and 11 . 
     In this case, as shown by reference symbols  21   a  and  21   b  shown in  FIGS. 9 to 11 , the vibration has a two pairs of nodes. By setting the supporting portion  23   c  of the dust-proofing filter supporting member  23  such that it is abutted to a portion corresponding to the joint  21   a , the dust-proofing filter  21  is efficiently supported without reducing the vibration similarly to the above-described example shown in  FIGS. 6 to 8 . 
     In this status, the CPU  41  controls the dust-proofing filter driving unit  48  (refer to  FIG. 2 ) at a predetermined timing and applies the periodic voltage to the piezoelectric element  22 , thereby vibrating the dust-proofing filter  21 . Thus, it is possible to remove dust and the like which are adhered to the surface of the dust-proofing filter  21 . 
     When a first-degree vibration is generated as shown in  FIGS. 6 to 8 , in the sealing space  51 , the amplitude of the dust-proofing filter  21  generates the change in volume shown by a reference symbol C. As shown in  FIGS. 9 to 11 , when a second-degree vibration is generated, the change in volume in the sealing space  51  generated by the amplitude of the dust-proofing filter  21  is obtained by subtracting an area shown by a reference symbol D 2 ×2 from an area shown by a reference symbol D 1 , that is,
 
D1−(D2×2).
 
     The smaller the change in volume to the sealing space  51  is, the smaller the change in inner pressure in the sealing space  51  is. Therefore, it will be understood that, the smaller the change in volume of the sealing space  51  is, the more efficient vibration can be obtained. Thus, in view of the efficiency of the electromechanical transducing, it is preferable to set the generated vibration to a high-degree vibration mode. 
     As mentioned above, according to the first embodiment, the sealing structure for sealing the space portion  51   b  at the peripheral side of the optical LPF  25  and the dust-proofing filter  21  is provided outside from the peripheral or the adjacent portion of the optical LPF  25  so as to form the sealing space  51  which is substantially sealed and includes the void portion  51   a  formed by opposing the optical LPF  25  (optical device) and the dust-proofing filter  21  (dust-proofing member). Therefore, in the case of ensuring a predetermined volume of the space portion, a gap between the optical LPF  25  (optical device) and the dust-proofing filter  21  (dust-proofing member) can be set to be short. 
     In general, if the gap between the optical LPF  25  (optical device) and the dust-proofing filter  21  (dust-proofing member) is set to be short, the volume of the void portion  51   a  is small. Thus, it is well known that the piezoelectric element  22  (member for vibration) causes the inner pressure of the sealing space  51  to be increased upon applying the vibrations to the dust-proofing filter  21 . However, when the inner pressure of the sealing space  51  is high, the vibration of the dust-proofing filter  21  generated by the piezoelectric element  22  tends to be reduced. 
     On the other hand, if the gap between the optical LPF  25  (optical device) and the dust-proofing filter  21  (dust-proofing member) is set to be long, the dimension of the image pick-up device unit  15  in the optical axis direction is also increased. This causes an obstruction against making a small size of the camera  1  in the optical axis direction. 
     According to the first embodiment, it is possible to suppress the increase in dimension of the image pick-up device unit  15  in the optical axis direction without reducing the vibrations of the dust-proofing filter  21  generated by the piezoelectric element  22  while sufficiently assuring the volume of the sealing space  51 , by providing the space portion  51   b  outside from the peripheral portion or the adjacent portion of the optical LPF  25 . Therefore, easily, the above-described arrangement of the space portion  51   b  contributes to making a compact size of the camera  1  in the optical axis direction. 
     According to the first embodiment, in the camera  1 , the dust-proofing filter supporting member  23  and the CCD case  24  are formed independently, and they almost airtightly fit to each other. However, the present invention is not limited to this. For example, the dust-proofing filter supporting member  23  and the CCD case  24  may integrally be formed as one member. A second embodiment of the present invention, which will be described hereinbelow, is described as an example thereof. 
     That is, the structure according to the second embodiment of the present invention is substantially the same as that according to the first embodiment. Unlike the structure of the first embodiment, in place of the dust-proofing filter supporting member ( 23 ) as the first member and the CCD case ( 24 ) as the second member according to the first embodiment, a member formed by integrating the first member and the second member is applied according to the second embodiment. Therefore, the same structure as that according to the first embodiment is not described in detail and are designated by the same reference numerals. The structure of the entire camera is not illustrated and is referred to  FIGS. 1 and 2 . 
       FIGS. 12 and 13  are diagrams showing by extracting a part of an image pick-up device unit in a camera according to the second embodiment of the present invention.  FIG. 12  is a perspective view showing a cut-off part of the assembled image pick-up device unit, corresponding to  FIG. 4  according to the first embodiment.  FIG. 13  is a sectional view along a cut-off plane shown in  FIG. 12 , corresponding to  FIG. 5  according to the first embodiment. 
     Referring to  FIGS. 12 and 13 , similarly to  FIGS. 4 and 5  according to the first embodiment, only a main portion of an image pick-up device unit  15 A is extracted to illustrate and the shutter unit ( 14 ) is not shown. For the purpose of showing the positional relationship of the members, the main circuit board  16  is shown together. 
     As mentioned above, in the image pick-up device unit  15 A according to the second embodiment, in place the dust-proofing filter supporting member ( 23 ; first member) and the CCD case ( 24 ; second member) according to the first embodiment, the member formed by integrating the first member and the second member, that is, a dust-proofing filter supporting and CCD case  33  (hereinafter, briefly referred to as a CCD case)  33  is arranged. 
     The CCD case  33  integrally includes a first portion and a second portion. That is, the first portion functions as the dust-proofing filter supporting unit for supporting the dust-proofing filter  21  in contact with the peripheral portion or the adjacent portion of the dust-proofing filter  21 . The second portion functions as the image pick-up device accommodating case unit for accommodating, fixing, and holding the image pick-up device  27  and for supporting the optical LPF  25  in contact with the peripheral portion or the adjacent portion of the optical LPF  25 . Thus, the sealing structure is formed. 
     In the image pick-up device unit  15 A of the camera according to the second embodiment, the sealing structure is formed as follows. 
     That is, a predetermined void portion  51 Aa is formed in a space formed by opposing the optical LPF  25  and the dust-proofing filter  21 . On the peripheral side of the optical LPF  25 , a space portion  51 Ab is formed by the CCD case  33  and the dust-proofing filter  21  to be extended towards the outside of the optical LPF  25 . The space portion  51 Ab is set to be wider than the void portion  51 Aa. A space containing the void portion  51 Aa and the space portion  51 Ab corresponds to a sealing space  51 A which is substantially airtightly sealed by the CCD case  33 , the dust-proofing filter  21 , and the optical LPF  25 . 
     As mentioned above, in the image pick-up device unit  15 A in the camera according to the second embodiment, the sealing structure includes the sealing space  51 A which is formed at the periphery of the optical LPF  25  and the dust-proofing filter  21  and which is substantially sealed, including the void portion  51 Aa. The sealing structure is provided at the position outside the periphery or the adjacent portion of the optical LPF  25 . 
     Further, according to the second embodiment, the sealing structure includes the CCD case  33 . The CCD case  33  integrally includes the first portion for supporting the dust-proofing filter  21  in contact with the peripheral portion or the adjacent portion of the dust-proofing filter  21  and the second portion for supporting the optical LPF  25  in contact with the peripheral portion or the adjacent portion of the optical LPF  25 . 
     Other structures are the same as those according to the first embodiment. The same advantages as those according to the first embodiment are obtained upon removing dust and the like adhered to the surface of the dust-proofing filter  21  by applying the vibrations to the dust-proofing filter  21  by using the piezoelectric element  22 . 
     As mentioned above, according to the second embodiment, the same advantages as those according to the first embodiment are obtained. 
     Simultaneously, according to the second embodiment, the sealing structure is simplified and the number of parts is reduced because the sealing structure integrally includes the first portion functioning as the dust-proofing filter supporting unit for supporting the dust-proofing filter  21  in contact with the peripheral portion or the adjacent portion of the dust-proofing filter  21  and the second portion functioning as the image pick-up device accommodating case unit for accommodating, fixing, and holding the image pick-up device  27  and for supporting the optical LPF  25  in contact with the peripheral portion and the adjacent portion of the optical LPF  25 . Further, the above-mentioned sealing structure contributes to the reduction in manufacturing costs and the simplification in manufacturing processes. 
     The camera according to the first embodiment has the optical low-pass filter (optical LPF; optical device). However, the present invention is not limited to this and can be applied to an image pick-up device unit in a camera having no optical LPF. 
     In the case of a digital camera using a numerous-pixel type image pick-up device in which the number of valid pixels (the number of pixels used for formation of image data) of the image pick-up device exceeds the resolution of the lens, the image pick-up device unit is formed by excluding the optical LPF in front of the image pick-up device. The present invention can easily be applied in the above-mentioned case. According to a third embodiment, an example will be described hereinbelow. 
     In other words, the structure according to the third embodiment is substantially the same as that according to the second embodiment. Unlike the second embodiment, the optical LPF ( 25 ) according to the second embodiment is excluded and a CCD case  34  for supporting the dust-proofing filter  21  and for fixing and holding the image pick-up device  27  and the optical LPF ( 25 ) is used in place of the CCD case ( 33 ) for fixing and holding the image pick-up device  27  and the optical LPF ( 25 ). Other structures are the same as those according to the second embodiment. Therefore, the same structure as that according to the second embodiment is designated by the same reference numeral and is not described in detail. The structure of the entire camera is not illustrated similarly to the second embodiment and is referred to in  FIGS. 1 and 2  using for the description of the first embodiment. 
       FIGS. 14 and 15  are diagrams showing by extracting a part of the image pick-up device unit in the camera according to the third embodiment of the present invention.  FIG. 14  is a perspective view showing a cut-off part of the assembled image pick-up device unit, corresponding to  FIG. 4  according to the first embodiment or to  FIG. 12  according to the second embodiment.  FIG. 15  is a sectional view along a cut-off plane shown in  FIG. 14 , corresponding to  FIG. 5  according to the first embodiment or to  FIG. 13  according to the second embodiment. 
     Referring to  FIGS. 14 and 15 , similarly to  FIGS. 4 and 5  according to the first embodiment and  FIGS. 12 and 13  according to the second embodiment, only a main portion of an image pick-up device unit  15 B is extracted to be shown and the shutter unit ( 14 ) is not shown. Similarly, the main circuit board  16  is illustrated for the purpose of showing the positional relationship of the members. 
     As mentioned above, according to the third embodiment, the image pick-up device unit  15 B is formed by excluding the optical LPF  25  in the camera  1  according to the first embodiment. Further, similarly to the second embodiment, the image pick-up device unit  15 B comprises a dust-proofing filter supporting and CCD case (hereinafter, simply referred to a CCD case)  34 , as a member formed by integrating the dust-proofing filter supporting member ( 23 ; first member) and the CCD case ( 24 ; second member) according to the first embodiment, without using both of the members. 
     The CCD case  34  integrally includes a first portion and a second portion. That is, the first portion functions as the dust-proofing filter supporting unit for supporting the dust-proofing filter  21  in contact with the peripheral portion or the adjacent portion of the dust-proofing filter  21 . The second portion functions as the image pick-up device accommodating case unit for supporting the photoelectrically converting surface of the image pick-up device  27  in contact with the peripheral portion or the adjacent portion of the image pick-up device  27 . Thus, the sealing structure is formed. 
     The sealing structure in the image pick-up device unit  15 B in the camera is structured as follows according to the third embodiment. 
     That is, a predetermined void portion  51 Ba is formed in a space formed by opposing the photoelectrically converting surface of the image pick-up device  27  and the dust-proofing filter  21 . A space portion  51 Bb includes the CCD case  34  and the dust-proofing filter  21 , extending to the outside of the photoelectrically converting surface on the peripheral side of the photoelectrically converting surface of the image pick-up device  27 . The space portion  51 Bb is set to be wider than the void portion  51 Ba. A space containing the void portion  51 Ba and the space portion  51 Bb forms a sealing space  51 B which is substantially airtightly sealed by the CCD case  34 , the dust-proofing filter  21 , and the image pick-up device  27 . 
     As mentioned above, in the image pick-up device unit  15 B in the camera according to the third embodiment, the sealing structure includes the sealing space  51 B which is formed at the photoelectrically converting surface of the image pick-up device  27  and at the periphery of the dust-proofing filter  21 , which contains the void portion  51 Ba, and which is substantially sealed. The sealing structure is provided at the position outside the periphery or adjacent portion of the photoelectrically converting surface of the image pick-up device  27 . 
     Further, according to the third embodiment, the sealing structure includes the CCD case  34  which is formed by integrating the first portion and the second portion. That is, the first portion supports the dust-proofing filter  21  in contact with the peripheral or the adjacent portion thereof. The second portion supports the photoelectrically converting surface of the image pick-up device  27  in contact with the peripheral or the adjacent portion thereof. 
     According to the third embodiment, the image pick-up device unit  15 B is formed by excluding the optical device as mentioned above. Therefore, the dust-proofing filter  21  has a transparent portion which is arranged and opposed to the photoelectrically converting surface of the image pick-up device  27  in front thereof at a predetermined interval. 
     Other structures are the same as those according to the first and second embodiments. The piezoelectric element  22  applies the vibrations to the dust-proofing filter  21 , thereby obtaining the same advantages as those according to the first and second embodiments upon removing dust and the like which are adhered to the surface of the dust-proofing filter  21 . 
     As mentioned above, according to the third embodiment, the same advantages as those according to the second embodiment are obtained in a camera which applies the image pick-up device unit excluding the optical LPF  25 . 
     Namely, according to the third embodiment, the above-mentioned sealing structure integrally comprises the first portion and the second portion. The first portion functions as the dust-proofing filter supporting unit for supporting the dust-proofing filter  21  in contact with the peripheral or the adjacent portion thereof and the second portion functions as the image pick-up device accommodating case unit for supporting the photoelectrically converting surface of the image pick-up device  27  in contact with the peripheral or the adjacent portion thereof. Advantageously, the sealing structure is simplified and the number of members is reduced. Further, advantageously, the manufacturing process is simplified and the manufacturing cost is reduced. 
     According to the third embodiment, as an example, the camera is formed by excluding the low-pass filter (optical LPF; optical device) according to the first embodiment and the sealing structure comprises the CCD case ( 34 ) which integrally includes the first portion for supporting the dust-proofing filter  21  and the second portion for supporting the image pick-up device  27 . However, the present invention is not limited to the example and, in the image pick-up device unit of the camera having no optical LPF, the dust-proofing filter supporting member ( 23 ) and the CCD case ( 24 ) are independently formed similarly to the first embodiment and they further are airtightly fit to each other. Next, an example of the foregoing will be described according to the fourth embodiment of the present invention. 
     In other words, the structure according to the fourth embodiment is substantially the same as that according to the first embodiment. However, unlike the first embodiment, the optical LPF ( 25 ) according to the first embodiment is excluded and the sealing structure includes the dust-proofing filter supporting member ( 23 ) as the first member for supporting the dust-proofing filter ( 21 ) corresponding to the removal of the optical LPF ( 25 ) in contact with the peripheral or the adjacent portion of the dust-proofing filter ( 21 ) and the CCD case ( 24 ) as the second member for supporting the image pick-up device ( 27 ) at the peripheral or the adjacent portion of the photoelectrically converting surface thereof. Therefore, the same structure as that according to the first embodiment is referred to the drawings used for the description of the first embodiment. 
     In this case, the sealing structure has the space portion ( 51   b ) extending to the outside of the photoelectrically converting surface of the image pick-up device  27 , and the space portion ( 51   b ) is wider than the space containing the air gap portion ( 51   a ) formed by opposing the dust-proofing filter ( 21 ) and the image pick-up device ( 27 ), similarly to the third embodiment. 
     As mentioned above, according to the fourth embodiment, the same advantages as those according to the first to third embodiment are obtained. 
     On the other hand, in the camera according to the first embodiment, the dust-proofing filter supporting member  23  and the dust-proofing filter  21  are airtightly jointed via the piezoelectric element  22  interposed by using the pressing force of the pressing member  20  as the elastic member. However, means for airtightly jointing the dust-proofing filter supporting member  23  and the dust-proofing filter  21  is not limited to the above example. For example, in place of the pressing member  20  (elastic member), the dust-proofing filter and the dust-proofing filter supporting member may be jointed by using adhesion force which is generated by the adhesive. A fifth embodiment of the present invention described in the following is the example. 
     According to the fifth embodiment of the present invention, basically, the structure is substantially the same as that of the first embodiment. However, unlike the structure according to the first embodiment, in place of the pressing member  20  according to the first embodiment, the dust-proofing filter  21  and the dust-proofing filter supporting member  23  are airtightly jointed via the piezoelectric element  22  interposed by using the adhesive. In accordance therewith, the dust-proofing filter supporting member is different from that according to the first embodiment. Therefore, the same structure as that according to the first embodiment is designated by the same reference numeral and is not described in detail. The structure of the entire camera is substantially the same as that according to the first embodiment, therefore, is not illustrated, and  FIGS. 1 and 2  used for the description according to the first embodiment are referred. 
       FIGS. 16 to 18  are diagrams showing by extracting a part of members forming an image pick-up device unit in a camera according to the fifth embodiment of the present invention.  FIG. 16  is a front view showing the dust-proofing filter supporting member (first member) among the members forming the image pick-up device unit.  FIG. 17  is an exploded perspective view showing the dust-proofing filter supporting member and the dust-proofing filter (dust-proofing member) among the members forming the image pick-up device unit.  FIG. 18  is a sectional view at a position along a line  18 - 18  shown in  FIG. 16  when the dust-proofing filter supporting member and the dust-proofing filter are jointed by the adhesive. 
     In the image pick-up device unit ( 15 ) in the camera according to the fifth embodiment, as mentioned above, the dust-proofing filter  21  and a dust-proofing filter supporting member  23 A are airtightly jointed via the piezoelectric element  22  interposed by using an adhesive  31 . 
     Thus, the dust-proofing filter supporting member  23 A is formed as follows. That is, similarly to the first embodiment, a circular or polygonal opening  23 Af is pierced substantially in the center of the dust-proofing filter supporting member  23 A. Similarly to the opening according to the first embodiment, the opening  23 Af has a size large enough to pass through the subject beams transmitted through the photographing optical system ( 12   a ) and to irradiate the photoelectrically converting surface of the image pick-up device  27  at the back. 
     A wall portion  23 Ae projecting on the front side is substantially annularly formed at the peripheral portion of the opening  23 Af. A supporting portion  23 Ac is formed at the edge portion of the wall portion  23 Ae, projecting to the front side (refer to  FIGS. 16 to 18 ). 
     A plurality of (three, according to the fifth embodiment) projecting portions  23 Aa are formed at predetermined positions near an outer peripheral portion of the dust-proofing filter supporting member  23 A, projecting to the front side thereof. The projecting portions  23 Aa function as positional regulating members for positioning when the dust-proofing filter  21  is arranged to adhere to the dust-proofing filter supporting member  23 A. 
     The dust-proofing filter  21  is adhered to the front side of the dust-proofing filter supporting member  23 A via the piezoelectric element  22  interposed by the adhesive  31 . 
     In this case, the adhesive  31  is applied in an annular area throughout the entire region excluding the supporting portion  23 Ac at the edge portion of the wall portion  23 Ae in the dust-proofing filter supporting member  23 A. In this status, the dust-proofing filter  21  is adhered from the front side of the dust-proofing filter supporting member  23 A. In this case, by moving the outer peripheral portion of the dust-proofing filter  21  along the projecting portions  23 Aa in the optical axis direction, the dust-proofing filter  21  is arranged at the predetermined position of the dust-proofing filter supporting member  23 A. Referring to  FIG. 18 , the supporting portions  23 Ac are abutted against predetermined positions (portions as nodes upon vibration) of the dust-proofing filter  21  (actually, of the piezoelectric element  22 ). 
     Thus, the dust-proofing filter supporting member  23 A is airtightly jointed to the dust-proofing filter  21  by the adhesive  31  in the annular area near the peripheral portion of the dust-proofing filter  21 , that is, at the edge portion of the wall portion  23 Ae. 
     Other structures are substantially the same as those according to the first embodiment. By applying the vibrations to the dust-proofing filter  21  by using the piezoelectric element  22 , the same advantages as those according to the first embodiment are obtained upon removing dust and the like adhered to the surface of the dust-proofing filter  21 . 
     As mentioned above, according to the fifth embodiment, the same advantages as those according to the first embodiment are obtained. 
     Further, according to the fifth embodiment, the dust-proofing filter  21  is fixed and held, and the adhesive  31  is used as means for airtightly jointing the dust-proofing filter  21  with the dust-proofing filter supporting member  23 A, thereby simplifying the structure. Advantageously, the number of members is reduced. Further, advantageously, the manufacturing process is simplified and the manufacturing cost is reduced. 
     According to the fifth embodiment, other structures are the same as those according to the first embodiment. However, they are not limited to this and may be the same as those according to any of the second to fourth embodiments. 
     Namely, according to the fifth embodiment, similarly to the first embodiment, the optical LPF  25  is provided, the dust-proofing filter supporting member  23  (first member) and the CCD case  24  (second member) are independently formed, and the dust-proofing filter supporting member  23  (first member) is airtightly fit to the CCD case  24  (second member). 
     Meanwhile, according to the second embodiment, the optical LPF  25  is provided, and the dust-proofing filter supporter and CCD case formed by integrally including the first portion functioning as the dust-proofing filter supporting member and the second portion functioning as the CCD case is provided (refer to  FIGS. 12 and 13 ). 
     In this case, it is similarly advantageous that the shape of the dust-proofing filter supporting and CCD case is the same as that of the CCD case  33  according to the second embodiment and the dust-proofing filter  21  is airtightly jointed to the CCD case  33  by using the adhesive  31 . 
     According to the third embodiment, the optical LPF is excluded and the dust-proofing filter supporting and CCD case formed by integrally including the first portion functioning as the dust-proofing filter supporting member and the second portion functioning as the CCD case is provided (refer to  FIGS. 14 and 15 ). 
     In this case, it is similarly advantageous that the shape of the dust-proofing filter supporting and CCD case is the same as the CCD case  34  according to the third embodiment and the dust-proofing filter  21  is airtightly jointed to the CCD case  34  by using the adhesive  31 . 
     According to the fourth embodiment, the optical LPF is excluded (not shown), the dust-proofing filter supporting member (first member) and the CCD case (second member) are formed independently, and the dust-proofing filter supporting member (first member) and the CCD case (second member) are airtightly fit to each other. In this case, it is similarly advantageous that the shapes of the dust-proofing filter supporting member and the CCD case are the same as the dust-proofing filter supporting member and the CCD case according to the fourth embodiment and the dust-proofing filter  21  is airtightly jointed to the dust-proofing filter supporting member by using the adhesive  31 . 
     According to the fifth embodiment, the image pick-up device unit is structured by independently forming the dust-proofing filter supporting member (first member) and the CCD case (second member), and it is formed by excluding the optical LPF ( 25 ). Advantageously, the fifth embodiment can be applied in entirely the same manner to a camera including the variously modified image pick-up device units. In either case, the same effectiveness can be obtained. 
     As mentioned above, in the image pick-up device unit in the camera according to any of the first to fifth embodiments, the piezoelectric element (member for vibration) is used to apply the predetermined vibrations to the dust-proofing filter. Thus, dust and the like adhered to the surface of the dust-proofing filter are removed. 
     In this case, when the dust-proofing filter is vibrated, the air at the peripheral portion is moved. The dust-proofing filter is arranged in contact with the dust-proofing filter supporting member or the combination of dust-proofing filter supporting and CCD case, thus to constitute the sealing structure which forms a predetermined sealing space. 
     Therefore, if the sealing space is completely airtight, air does not flow into the sealing space from the outside when the dust-proofing filter is vibrated. Thus, it is expected that the positive and negative voltage change is caused in the sealing space. The generation of vibrations while causing the change in voltage requires corresponding energy or power, and cause an obstruction against the vibration of the dust-proofing filter. 
       FIGS. 19 ,  20 , and  21  are sectional views schematically showing by extracting a part of the image pick-up device unit upon forming the sealing space in which the front side of the image pick-up device is completely sealed from the outside by the dust-proofing filter and a predetermined member for supporting the dust-proofing filter.  FIG. 19  shows a status in which the voltage is not applied to the piezoelectric element.  FIG. 20  shows a status in which the positive voltage is applied to the piezoelectric element.  FIG. 21  shows a status in which the negative voltage is applied to the piezoelectric element. 
     A description is given of the structure of the image pick-up device unit according to the first embodiment with reference to  FIGS. 19 to 21  as an example. 
     First, when the voltage is not applied to the piezoelectric element  22  in the image pick-up device unit  15  (refer to  FIG. 19 ), the positive (+) voltage is applied to the piezoelectric element  22 , thus to enter the status shown in  FIG. 20 . In the status shown in  FIG. 20 , the dust-proofing filter  21  is bent toward the optical LPF  25 . Consequently, the back side of the dust-proofing filter  21  is extremely close to the front side of the step portion  24   a  of the CCD case  24 . Then, air in the void portion  51   a  between the dust-proofing filter  21  and the optical LPF  25  flows to the direction evacuating from the void portion  51   a . However, the void portion  51   a  is completely sealed from the outside and the passage between the void portion  51   a  and the space portion  51   b  is substantially shut off by the dust-proofing filter  21 . Thus, the air in the void portion  51   a  has no evacuating portion. Therefore, since the amount of air is not changed irrespective of the decrease in inner volume of the void portion  51   a , a positive inner pressure is generated, resulting in the obstruction against the vibration of the dust-proofing filter  21 . 
     On the other hand, the negative voltage is applied to the piezoelectric element  22  of the image pick-up device unit  15 , resulting in the status shown in  FIG. 21 . In the status shown in  FIG. 21 , the dust-proofing filter  21  is bent in the direction leaving from the optical LPF  25 . In this case, the sealing space  51  containing the void portion  51   a  and the space portion  51   b  between the dust-proofing filter  21  and the optical LPF  25  is completely sealed from the outside and thus no air flows in the sealing space  51 . Since the amount of air is not changed irrespective of the increase in inner volume of the void portion  51   a , the negative inner pressure is generated, resulting in the obstruction against the vibration of the dust-proofing filter  21 . 
     Then, in views of the above-mentioned points, a description is given hereinbelow of various embodiments having means for reducing the inner pressure in the sealing space by flowing the air into the sealing space from the outside upon the vibration of the dust-proofing filter while keeping predetermined airtightness in the sealing space. 
       FIGS. 22 and 23  are diagrams showing by extracting a part of members forming an image pick-up device unit in a camera according to the sixth embodiment of the present invention.  FIG. 22  is a perspective view showing the CCD case (second member) among the members forming the image pick-up device unit.  FIG. 23  is a cross-section of the image pick-up device, that is, a sectional view at a position along a line  23 - 23  shown in  FIG. 22 . 
     According to the sixth embodiment, the structure is substantially the same as that according to the first embodiment. Unlike the structure according to the first embodiment, a notch portion  24 Ak is formed as a flow passage between the void portion  51   a  and the space portion  51   b  at a predetermined position of the CCD case  24 A. Therefore, the same structure as that according to the first embodiment is designated by the same reference numeral and is not described in detail. The illustration of the structures of the entire camera and the entire image pick-up device unit is referred to  FIGS. 1 to 5  used for the description of the first embodiment. 
     Referring to  FIGS. 22 and 23 , the CCD case  24 A in an image pick-up device unit  15 C in the camera according to the sixth embodiment is basically formed substantially similarly to the CCD case  24  according to the first embodiment. 
     According to the sixth embodiment, the CCD case  24 A has the notch portion  24 Ak with a substantially arc-shaped cross-section, which is obtained by notching a part of the step portion  24   a  provided to support the optical LPF  25  inside. 
     In other words, the step portion  24   a  becomes a contact surface portion which is formed such that the CCD case  24  (second member) airtightly comes into contact with the peripheral portion of the optical LPF  25 , and the notch portion  24 Ak is provided at a part of the contact surface. 
     Therefore, the notch portion  24 Ak functions as the flow passage for assisting the air flow between the void portion  51   a  and the space portion  51   b  upon vibration of the dust-proofing filter  21 . 
     That is, according to the sixth embodiment, the sealing structure formed in the image pick-up device unit  15 C has the flow passage for suppressing the resistance of the air flow between the air gap space  51   a  as a relatively narrow space portion and the space portion  51   b  as a relatively large space portion in the sealing space  51  formed in the image pick-up device unit  15 C at a predetermined position, namely, at a part of the step portion  24   a  in the CCD case  24 . 
     Other structures are substantially the same as those according to the first embodiment. 
     In the image pick-up device unit  15 C with the above-mentioned structure, the operation is as follows upon applying the vibrations to the dust-proofing filter  21  by using the piezoelectric element  22 . 
     First, in a status in which no voltage is applied to the piezoelectric element  22  (the same status as that in  FIG. 19 ), the positive voltage is applied to the piezoelectric element  22  and the dust-proofing filter  21  is bent toward the optical LPF  25  (refer to  FIG. 20 ). 
     In this case, even if the back side of the dust-proofing filter  21  extremely comes into contact with the front side of the step portion  24   a  of the CCD case  24  (the similar status of that shown in  FIG. 20 ), the air in the void portion  51   a  passes through the notch portion  24 Ak provided at a part of the CCD case  24 A and flows out to the space portion  51   b.    
     Therefore, in accordance with the reduction in inner volume of the void portion  51   a  due to the bending of the dust-proofing filter  21 , the amount of air in the void portion  51   a  is easily reduced. Consequently, the increase in inner pressure of the void portion  51   a  is suppressed. 
     On the other hand, the negative voltage is applied to the piezoelectric element  22  and then the dust-proofing filter  21  is bent in the direction leaving from the optical LPF  25  (refer to  FIG. 21 ). In this case, the air in the space portion  51   b  flows into the void portion  51   a  via the notch portion  24 Ak. 
     Thus, in accordance with the increase in inner volume of the void portion  51   a  due to the bending of the dust-proofing filter  21 , the amount of air in the void portion  51   a  is easily increased. Consequently, the reduction in inner pressure of the space portion  51   a  is suppressed. 
     As mentioned above, according to the sixth embodiment, only the notch portion  24 Ak is provided at a predetermined position in a part of the CCD case  24 A so as to connect the void portion  51   a  and the space portion  51   b . As a result, the air in the sealing space  51  caused due to the vibrations of the dust-proofing filter  21  by using the piezoelectric element  22  easily flows and the change in inner pressure in the space is suppressed. Therefore, the obstruction against the vibration of the dust-proofing filter  21  is prevented. 
     According to the sixth embodiment, the same image pick-up device unit  15 C as that according to the first embodiment is illustrated but the present invention is not limited to this. 
     In the case of the second embodiment (refer to  FIGS. 12 and 13 ), according to the sixth embodiment, the notch portion ( 24 Ak) as the flow passage is provided at the predetermined position of the CCD case  33 , which are the dust-proofing filter supporter and CCD case, and which are formed by integrating the dust-proofing filter supporting member and the CCD case, namely, at a part of the contact surface which is formed such that the CCD case  33  (second portion of the integration) is airtightly jointed to the peripheral portion of the optical LPF  25 . Thus, the same advantages are obtained in this case. 
     Further, in the case of the third embodiment (refer to  FIGS. 14 and 15 ), according to the sixth embodiment, the notch portion ( 24 Ak) as the flow passage is provided at the predetermined position of the CCD case  34 , which are the dust-proofing filter supporter and CCD case, and which are formed by integrating the dust-proofing filter supporting member and the CCD case, namely, at a part of the contact surface which is formed such that the CCD case  34  (second portion of the integration) airtightly comes into contact with the peripheral portion of the photoelectrically converting surface of the image pick-up device  27 . Thus, the same advantages are obtained in this case. 
     Furthermore, in the case of the fourth embodiment, although not shown, the notch portion ( 24 Ak) as the flow passage is provided at the predetermined position of the CCD case, namely, at a part of the contact surface which is formed such that the CCD case (second member) airtightly comes into contact with the peripheral portion of the photoelectrically converting surface of the image pick-up device. Thus, the same advantages are obtained in this case. 
     As mentioned above, according to the sixth embodiment, it is possible to apply the camera having any of various image pick-up device units such as the image pick-up device unit in which both the dust-proofing filter supporting member (first member) and the CCD case (second member) are formed independently, or the image pick-up device unit in which the optical LPF ( 25 ) is excluded. In any of the examples, the same advantages are obtained. 
       FIGS. 24 and 25  are diagrams showing by extracting a part of members forming an image pick-up device unit in a camera according to a seventh embodiment.  FIG. 24  is a perspective view showing a CCD case (second member) among the members forming the image pick-up device unit.  FIG. 25  is a sectional view at a position along a line  25 - 25  shown in  FIG. 24 . 
     The structure according to the seventh embodiment is the same as that according to the first embodiment. Unlike the first embodiment, a pierced hole  24 Bg as a relatively minute passage is provided for connecting the inside to the outside of the sealing space  51  at a predetermined position of the CCD case  24 B. Therefore, the same structure as that according to the first embodiment is designated by the same reference numeral and a detailed description thereof is omitted. The entire camera and the components of the entire image pick-up device unit are illustrated with reference to  FIGS. 1 to 5  used for the description of the first embodiment. 
     Referring to  FIGS. 24 and 25 , according to the seventh embodiment, the CCD case  24 B in an image pick-up device unit  15 D is basically formed in the same manner as that of the CCD case  24  according to the first embodiment. 
     In the CCD case  24 B according to the seventh embodiment, the pierced hole  24 Bg as the relatively minute passage is provided for connecting the sealing space  51   b  to the outside at a predetermined position of the CCD case  24 B, for example, at a part of an area extending to an outer peripheral side of the optical LPF  25 . 
     Therefore, the pierced hole  24 Bg forms the passage for assisting the air flow between the space portion  51   b  and the outside upon the vibration of the dust-proofing filter  21 . In this case, since the outside air flows into the space portion  51   b  via the pierced hole  24 Bg, there is a danger that dust and the like included in the outside air simultaneously enter. 
     Then, in consideration of the foregoing, in order to prevent the flow in the sealing space  51  of dust and the like having a larger size than a predetermined size via the pierced hole  24 Bg, the pierced hole  24 Bg needs to be set with a relative minute size. As the size of the pierced hole  24   g  set in this case, it is expected that dust and the like adhered to the photoelectrically converting surface of the image pick-up device  27  and the optical device LPF  25  do not affect an adverse influence on the image displayed based on the image signal to be obtained by the image pick-up device  27 . 
     As mentioned above, according to the seventh embodiment, the sealing structure in the image pick-up device unit  15 D comprises the dust-proofing filter supporting member  23  as the first member for supporting the dust-proofing filter  21  (dust-proofing member) in contact with the peripheral portion or the adjacent portion thereof, and the CCD case  24 B as the second member arranged for supporting the optical LPF  25  (optical device) in contact with the peripheral portion or the adjacent portion thereof and for airtightly coming into contact with the dust-proofing filter supporting member  23  (first member) at its predetermined portion. The CCD case  24 B (second member) has the pierced hole  24 Bg as the relatively minute passage for connecting the inside to the outside of the space portion  51   b  (sealing portion  51 ) at the predetermined portion thereof. 
     Other structures are the same as those according to the first embodiment. 
     In the image pick-up device unit  15 D with the above-mentioned structure, the following operations are obtained upon applying the vibrations to the dust-proofing filter  21  by using the piezoelectric element  22 . 
     First, in a status in which no voltage is applied to the piezoelectric element  22  (in the same status as that shown in  FIG. 19 ), the positive voltage is applied to the piezoelectric element  22  and then the dust-proofing filter  21  is bent toward the optical LPF  25  (refer to  FIG. 20 ). 
     In this case, the air in the sealing space  51 , in particular, in the space portion  51   b  flows out via the pierced hole  24 Bg provided at the bottom portion of the CCD case  24 B. 
     Therefore, the reduction in inner volume of the sealing space  51 , in particular, of the space portion  51   a  causes the easy decrease in amount of air in the sealing space  51 . Thus, the increase in inner pressure of the sealing space  51 A is suppressed. 
     On the other hand, the negative voltage is applied to the piezoelectric element  22  and then the dust-proofing filter  21  is bent in the direction leaving from the optical LPF  25  (refer to  FIG. 21 ). In this case, the outside air flows in the sealing space  51 , especially, in the space portion  51   b  via the pierced hole  24 Bg. 
     Therefore, in accordance with the increase in inner volume of the sealing space  51  due to the bending of the dust-proofing filter  21 , the amount of air in the sealing space  51  is easily increased. Thus, the reduction in inner pressure of the sealing space  51  is suppressed. 
     As mentioned above, according to the seventh embodiment, the arrangement of only the pierced hole  24 Bg for connecting the sealing space  51 , especially, the space portion  51   b , to the outside at the predetermined position of the CCD case  24 A facilitates the air flow between the sealing space  51  and the outside caused due to the vibration of the dust-proofing filter  21  generated by the piezoelectric element  22 , and suppresses the change in inner pressure of the sealing space  51 . Thus, the obstruction against the vibration of the dust-proofing filter  21  is suppressed. 
     According to the seventh embodiment, the image pick-up device unit  15 D with the same structure as that according to the first embodiment is illustrated as an example but the present invention is not limited to this. 
     For example, according to the second embodiment (refer to  FIGS. 12 and 13 ), the same advantages are obtained by providing the pierced hole ( 24 Bg) as the relatively minute passage for connecting the inside to the outside of the space  51   b  (sealing space  51 ) at the predetermined position of the CCD case  33  as the dust-proofing filter supporting and CCD case formed by integrating the dust-proofing filter supporting member and the CCD case  33 , namely, at a part of the area extending to the outer peripheral side of the optical LPF  25  as the bottom portion of the CCD case  33  (second member). 
     According to the third embodiment (refer to  FIGS. 14 and 15 ), with the structure formed by excluding the optical LPF, the same advantages as those of the foregoing are obtained by excluding the optical LPF and by providing the pierced hole ( 24 Bg) as the passage at the predetermined position of the CCD case  34  as the dust-proofing filter supporter and CCD case formed by integrating the dust-proofing filter supporting member and the CCD case, namely, at a part of the area extending to the outer peripheral side of the photoelectrically converting surface of the image pick-up device  27  as the bottom portion of the CCD case  34  (second member). 
     According to the fourth embodiment, with the structure excluding the optical LPF (not shown), the same advantages as those of the foregoing are obtained by providing the pierced hole ( 24 Bg) as the passage at a part of the area extending the outer peripheral side of the photoelectrically converting surface of the image pick-up device  27  as the bottom portion of the CCD case (second member). 
     As mentioned above, according to the seventh embodiment, various modified image pick-up device units such as the image pick-up device unit having the structure formed by independently forming the dust-proofing filter supporting member (first member) and the CCD case (second member) and the image pick-up device unit having the structure excluding the optical LPF ( 25 ) can be applied to the camera. In any of the cases, the same advantages are obtained. 
       FIGS. 26 and 27  are diagrams showing by extracting a part of members forming an image pick-up device unit in a camera according to the eighth embodiment of the present invention.  FIG. 26  is a perspective view showing the dust-proofing filter supporting member (first member) among the members forming the image pick-up device unit.  FIG. 27  is a sectional view at a position along a line  27 - 27  shown in  FIG. 26 . 
     According to the eighth embodiment, the basic structure is the same as that according to the first embodiment. The basic structure of the dust-proofing filter supporting member (first member) among the members forming the image pick-up device unit is the same as that of the dust-proofing filter supporting member  23 A according to the fifth embodiment. 
     According to the eighth embodiment, a dust-proofing filter supporting member  23 B has a pierced hole  23 Bh as a relatively minute passage for connecting the inside to the outside of the sealing space  51  at a predetermined position. Therefore, the same structure as that according to the first embodiment is designated by the same reference numeral and a detailed description thereof is omitted. The structures of the entire camera and the image pick-up device unit are illustrated with reference to  FIGS. 1 to 5  used for the description of the first embodiment. The dust-proofing filter supporting member is described with reference to  FIGS. 16 to 18  used for the description of the fifth embodiment. 
     Referring to  FIGS. 26 and 27 , according to the eighth embodiment, the dust-proofing filter supporting member  23 B in an image pick-up device unit  15 E in a camera is basically formed in the same manner as that according to the fifth embodiment. A wall portion  23 Be is formed projecting toward the front side at a peripheral portion of an opening  23 Bf with a substantially annular shape. 
     Further, the dust-proofing filter supporting member  23 B has the pierced hole  23 Bh as the relatively minute passage for connecting the space portion  51   b  to the outside at a predetermined position of the wall portion  23 Be. 
     The pierced hole  23 Bh becomes a passage for facilitating the air flow between the space portion  51   b  and the outside upon the vibration of the dust-proofing filter  21 . Upon using the dust-proofing filter supporting member  23 B with the above-mentioned structure, the outside air flows in the space portion  51   b  via the pierced hole  23 Bh. Thus, there is a danger that dust and the like included in the outside air simultaneously enter. 
     Then, in consideration of the danger, the pierced hole  23 Bh needs to be set with a relatively minute size so as to prevent the flow in the sealing space  51  of dust and the like having a predetermined size via the pierced hole  23 Bh. This is the same as that according to the sixth and seventh embodiments. 
     As mentioned above, according to the eighth embodiment, the sealing structure in the image pick-up device unit  15 E comprises the dust-proofing filter supporting member  23 B as the first member for supporting the dust-proofing filter  21  (dust-proofing member) in contact with the peripheral portion or the adjacent portion thereof, and the CCD case  24  as the second member arranged for supporting the optical LPF  25  (optical device) in contact with the peripheral portion or the adjacent portion thereof and for coming into closely contact with the dust-proofing filter supporting member  23 B (first member) at its predetermined portion. The dust-proofing filter supporting member  23 B (first member) has the pierced hole  23 Bh as the relatively minute passage for connecting the inside to the outside of the space portion  51   b  (sealing portion  51 ) at the predetermined portion thereof. 
     Other structures are the same as those according to the first embodiment. 
     In the image pick-up device unit  15 E with the above-mentioned structure, the following operations are obtained upon applying the vibrations to the dust-proofing filter  21  by using the piezoelectric element  22 . 
     First, in a status in which no voltage is applied to the piezoelectric element  22  (in the same status as that shown in  FIG. 19 ), the positive voltage is applied to the piezoelectric element  22  and then the dust-proofing filter  21  is bent toward the optical LPF  25  (refer to  FIG. 20 ). 
     In this case, the air in the sealing space  51 , in particular, in the space portion  51   b  flows out via the pierced hole  23 Bg. 
     Therefore, the reduction in inner volume of the sealing space  51 , in particular, of the space portion  51   a  facilitates the decrease in amount of air in the sealing space  51 . Thus, the increase in inner pressure of the sealing space  51  is suppressed. 
     On the other hand, the negative voltage is applied to the piezoelectric element  22  and then the dust-proofing filter  21  is bent in the direction leaving from the optical LPF  25  (refer to  FIG. 21 ). In this case, the outside air flows in the sealing space  51 , especially, in the space portion  51   b  via the pierced hole  23 Bh. 
     Therefore, the increase in inner volume of the sealing space  51  due to the bending of the dust-proofing filter  21  facilitates the increase in amount of air in the sealing space  51 . Thus, the reduction in inner pressure of the sealing space  51  is suppressed. 
     As mentioned above, according to the eighth embodiment, the arrangement of only the pierced hole  23 Bh for connecting the sealing space  51 , especially, the space portion  51   b , to the outside at the predetermined position of the dust-proofing filter supporting member  23 B facilitates the air flow, between the sealing space  51  and the outside, caused due to the vibrations of the dust-proofing filter  21  generated by the piezoelectric element  22 , and suppresses the change in inner pressure of the sealing space  51 . Thus, the obstruction against the vibrations of the dust-proofing filter  21  is suppressed. 
     According to the eighth embodiment, the image pick-up device unit  15 E with the same structure as that according to the first to fifth embodiments is illustrated as an example but the present invention is not limited to this. 
     For example, in the case of the second embodiment (refer to  FIGS. 12 and 13 ), the same advantages are obtained by providing the pierced hole  23 Bh as the relatively minute passage for connecting the inside to the outside of the space  51 Ab at the predetermined position of the CCD case  33  (second member) as the dust-proofing filter supporting and CCD case formed by integrating the dust-proofing filter supporting member and the CCD case  33 , namely, at the predetermined position of the substantially annular-shaped wall portion projected toward the front side at the peripheral portion of the opening of the CCD case  33 . 
     Further, in the case of the third embodiment (refer to  FIGS. 14 and 15 ), the same advantages as those of the foregoing are obtained by providing the pierced hole  23 Bh as the relatively minute passage for connecting the space portion  51 Ab to the outside at the predetermined position of the CCD case  34  as the dust-proofing filter supporting and CCD case formed by integrating the dust-proofing filter supporting member and the CCD case, namely, at the predetermined position of the substantially annular-shaped wall portion projected toward the front side at the peripheral portion of the opening of the CCD case  34  (first portion as the dust-proofing filter supporting member). 
     Furthermore, in the case of the fourth embodiment, although not shown, the same advantages as those of the foregoing are obtained by providing the pierced hole ( 23 Bh) as the relatively minute passage at the predetermined position of the CCD case, namely, at the predetermined position of the substantially annular-shaped wall portion projected toward the front side of the peripheral portion of the opening of the CCD case (second member). 
     As mentioned above, according to the eighth embodiment, various modified image pick-up device units such as the image pick-up device unit having the structure formed by independently forming the dust-proofing filter supporting member (first member) and the CCD case (second member) and the image pick-up device unit having the structure excluding the optical LPF ( 25 ) can be applied to the camera. In any of the cases, the same advantages are obtained. 
     Next, a description is given of the ninth embodiment of the present invention. 
       FIGS. 28 and 29  are diagrams showing by extracting a part of members forming an image pick-up device unit in a camera according to the ninth embodiment of the present invention.  FIG. 28  is a perspective view showing the back side of the CCD case (second member) among the members forming the image pick-up device unit.  FIG. 29  is a sectional view at a position along a line  29 - 29  shown in  FIG. 28 . 
     The basic structure according to the ninth embodiment of the present invention, is similar to that according to the seventh embodiment. Only the difference of the structure according to the ninth embodiment is that it is formed by further adding near the passage (pierced hole  24 Bg) provided for connecting the inside to the outside of the sealing space  51  at a predetermined position of the CCD case  24 B, a rubber cap  29 A formed elastically as a sealing assisting member for airtightly covering the opening end of the passage. 
     Therefore, the same structure as that according to the seventh embodiment is designated by the same reference numeral and a detailed description thereof is omitted. The structures of the entire camera and image pick-up device unit are illustrated with reference to  FIGS. 1 and 2  and  FIGS. 3 to 5  used for the description of the first embodiment. 
     Referring to  FIGS. 28 and 29 , according to the ninth embodiment, the CCD case  24 B in the image pick-up device unit  15 D in the camera is formed in the similar manner of that of the CCD case  24 B according to the seventh embodiment. 
     According to the ninth embodiment, near the pierced hole  24 Bg provided at the bottom portion of the CCD case  24 B, the rubber cap  29 A as the sealing assisting member for airtightly covering the opening end of the pierced hole  24 Bg is provided. In order to change the inner volume of the rubber cap  29 A depending on the inner pressure of the sealing space  51 , the rubber cap  29 A is formed with its cross section that is slightly convex-shaped toward the outside in the normal status, and is further made of an elastic member having the elasticity. In addition, the rubber cap  29 A has the pierced hole  24 Bg which is arranged to airtightly cover its opening end for connecting it to the outside of the sealing space  51  (in particular, the space portion  51   b ). 
     Other structures are substantially the same as those according to the seventh embodiment. 
     As mentioned above, according to the ninth embodiment, the rubber cap  29 A is airtightly provided at the outside of the opening end of the pierced hole  24 Bg. Thus, upon vibrating the dust-proofing filter  21 , the air including dust and the like directly do not enter the space portion  51   b  from the outside via the pierced hole  24 Bg. Further, the inner volume of the sealing space  51  is increased by a slightly small amount and the rubber cap  29 A is elastically formed. Consequently, the sealing space  51  is retracted in accordance with the change in inner pressure of the sealing space  51 , thereby increasing and reducing the inner volume of the sealing space  51 . 
     The image pick-up device unit  15 D having the above-mentioned structure has the following operations upon vibration of the dust-proofing filter  21  by using the piezoelectric element  22 . 
     First, in a status in which no voltage is applied to the piezoelectric element  22  (in the same status as that shown in  FIG. 19 ), the positive voltage is applied to the piezoelectric element  22  and then the dust-proofing filter  21  is bent toward the optical LPF  25  (refer to  FIG. 20 ). 
     In this case, the air in the sealing space  51 , in particular, in the space portion  51   b  flows into the rubber cap  29 A via the pierced hole  23 Bg. Simultaneously, the rubber cap  29 A increases the inner volume thereof by the extension caused depending on the inner pressure. 
     Therefore, the reduction in inner volume of the sealing space  51 , in particular, in the space portion  51   a  due to the bending of the dust-proofing filter  21  decreases the amount of air in the sealing space  51 . Thus, the air moves to the rubber cap  29 A. The rubber cap  29 A is relatively easily retracted in accordance with the change in air pressure. Thus, the increase in inner pressure of the sealing space  51  is suppressed. 
     On the other hand, the negative voltage is applied to the piezoelectric element  22  and then the dust-proofing filter  21  is bent in the direction leaving from the optical LPF  25  (refer to  FIG. 21 ). In this case, the air in the rubber cap  29 A flows in the sealing space  51 , especially, in the space portion  51   b  via the pierced hole  23 Bg. In this case, the rubber cap  29 A is relatively easily retracted in accordance with the change in air pressure. 
     Therefore, the increase in inner volume of the sealing space  51  increases due to the bending of the dust-proofing filter  21 . Simultaneously, the air in the rubber cap  29 A moves to the sealing space  51  and the amount of air in the sealing space  51  increases. Thus, the reduction in inner pressure of the sealing space  51  is suppressed. 
     As mentioned above, according to the ninth embodiment, the pierced hole  24 Bg for connecting the sealing space  51 , especially, the space portion  51   b  to the outside, is provided at the predetermined position of the CCD case  24 A, the opening end of the pierced hole  24 Bg is airtightly covered, and the sealing assisting member (rubber cap  29 A) which changes its inner volume depending on the inner pressure of the sealing space  51  is arranged. Consequently, the air between the sealing space  51  and the outside caused due to the vibrations of the dust-proofing filter  21  generated by the piezoelectric element  22  easily flows, and the change in inner pressure of the sealing space  51  is suppressed. Thus, the obstruction against the vibrations of the dust-proofing filter  21  is suppressed. 
     According to the ninth embodiment, the rubber cap  29 A is used as the sealing assisting member for airtightly covering the opening end of the pierced hole  24 Bg as an example. However, the sealing assisting member is not limited to this and, for example, it may be one described according to the tenth embodiment which will be described later. 
       FIGS. 30 and 31  are diagrams showing by extracting a part of members forming an image pick-up device unit in a camera according to the tenth embodiment of the present invention.  FIG. 30  is a perspective view showing the back side of the CCD case (second member) among the members forming the image pick-up device unit.  FIG. 31  is a sectional view at a position along a line  31 - 31  shown in  FIG. 30 . 
     The structure according to the tenth embodiment of the present invention, is similar to that according to the ninth embodiment. Only the difference of the structure according to the tenth embodiment is that it is formed by providing a rubber ring  29 B, as the sealing assisting member, for airtightly covering the opening end of the passage (pierced hole  24 Bg) arranged to the CCD case  24 B, in place of the rubber cap  29 A having the same function as that of the rubber annular  29 B. 
     Therefore, the same structure as that according to the ninth embodiment is designated by the same reference numeral and a detailed description thereof is omitted. The structures of the entire camera and image pick-up device unit are illustrated with reference to  FIGS. 1 and 2  and  FIGS. 3 to 5  used for the description of the first embodiment. 
     According to the tenth embodiment, the rubber ring  29 B made of an elastic member, etc., as the sealing assisting member, is arranged in an annular area of the peripheral portion or the adjacent portion of the optical LPF  25 . In order to change the inner volume of the rubber ring  29 B depending on the inner pressure of the sealing space  51 , the rubber ring  29 B is formed with its cross section that is slightly convex-shaped toward the outside in the normal status so as to change the inner volume of the rubber ring  29 B, and is further made of an elastic member having the elasticity, with a substantially circular shape. In this case, the rubber ring  29 B is arranged to the CCD case  24 B so as to become airtight, excluding the pierced hole  24 Bg as the passage. Incidentally, the structure removing a part of the rubber ring  29 B, namely, a part of the CCD case  24 B adjacent to the pierced hole  24 Bg is shown in  FIG. 30 . 
     Other structures are substantially the same as those according to the ninth embodiment. 
     As mentioned above, according to the tenth embodiment, the rubber ring  29 B is airtightly provided at the outside of the opening end of the pierced hole  24 Bg of the CCD case  24 B. Thus, upon vibration of the dust-proofing filter  21 , the air including dust and the like directly does not enter the space portion  51   b  from the outside via the pierced hole  24 Bg. Further, the inner volume of the sealing space  51  is increased by a slightly small amount and the rubber ring  29 B is elastically formed. Consequently, the sealing space  51  is retracted in accordance with the change in inner pressure of the sealing space  51 , thereby increasing and reducing the inner volume of the sealing space  51 . 
     As mentioned above, according to the tenth embodiment, the same advantages as those according to the ninth embodiment are obtained. Further, the inner volume in the space ensured by the sealing assisting member (rubber ring  29 B) can be increased. 
     According to the ninth and tenth embodiments, the above description is given of the image pick-up device unit  15 D having the above-mentioned structure according to the first to seventh embodiments as an example. However, the present invention is not limited to this. 
     For example, in the case of the second embodiment (refer to  FIGS. 12 and 13 ), the same advantages as those according to the ninth embodiment are obtained by providing the pierced hole  24 Bg for connecting the outside to the sealing space  51  at the predetermined position of the CCD case  33  (second portion) as the dust-proofing filter supporting and CCD case formed by integrating the dust-proofing filter supporting member and the CCD case  33  and by providing the sealing assisting member (rubber cap  29 A) for airtightly covering the opening end of the pierced hole ( 24 Bg) and for changing the inner volume of the sealing space  51  in accordance with the inner pressure thereof. 
     The same advantages as those according to the tenth embodiment are obtained by airtightly arranging the (rubber ring  29 B) made of the elastic member, as the sealing supporting member, at the predetermined position of (the second portion) of the CCD case  33 , namely, in the annular area of the peripheral portion or the adjacent portion of the optical LPF  25 , except for the pierced hole ( 24 Bg; passage). 
     In the case of the third embodiment (refer to  FIGS. 14 and 15 ), the same advantages as those according to the ninth embodiment are obtained by providing the pierced hole ( 24 Bg) for connecting the space portion  51  to the outside at the predetermined position of the CCD case  34  (second member) as the dust-proofing filter supporting and CCD case formed by integrating the dust-proofing filter supporting member and the CCD case and the sealing assisting member (rubber cap  29 A) for airtightly covering the opening end of the pierced hole ( 24 Bg) and for changing the inner volume of the sealing space  51  in accordance with the inner pressure of the sealing space  51 . 
     The same advantages as those according to the tenth embodiment are obtained by airtightly arranging the (rubber ring  29 B) made of the elastic member, as the sealing assisting member, at the predetermined position of the CCD case  33  (second member), namely, in the annular area of the peripheral portion or the adjacent portion of the optical LPF  25 , except for the pierced hole ( 24 Bg; passage). 
     In the case of the fourth embodiment, the same advantages as those according to the ninth embodiment are obtained by providing the pierced hole ( 24 Bg) for connecting the sealing space  51  to the outside at the predetermined position of the CCD case (second member) and by providing the sealing assisting member (rubber cap  29 A) for airtightly covering the opening end of the pierced hole ( 24 Bg) and for changing the inner volume of the sealing space  51  in accordance with the inner pressure of the sealing space  51 . 
     The same advantages as those according to the tenth embodiment are obtained by airtightly arranging the (rubber ring  29 B) made of the elastic member, as the sealing assisting member, at the predetermined position of the CCD case (second member), namely, in the annular area of the peripheral portion or the adjacent portion of the photoelectrically converting surface of the image pick-up device  27 , except for the pierced hole ( 24 Bg; passage). 
     In the image pick-up device unit  15  in the camera  1  according to the first embodiment, as mentioned above, the piezoelectric element  22  as the member for vibration for applying the vibrations to the dust-proofing filter  21  is arranged at the predetermined position of the peripheral portion of the dust-proofing filter  21  by using the adhering means such as an adhesive. 
     In this case, hereinbelow, a detailed description is given of the structure of the dust-proofing filter  21  (dust-proofing member) and the piezoelectric element  22  (member for vibration) in the image pick-up device unit  15 . 
       FIGS. 32 and 33  are diagrams showing by extracting a part of members forming an image pick-up device unit in a camera according to the eleventh embodiment of the present invention.  FIG. 32  is a perspective view showing a cut-off part of the dust-proofing member (optical member; dust-proofing filter), the member for vibration (piezoelectric element), and the dust-proofing filter supporting member, in views of the back side (image pick-up device side).  FIG. 33  is a sectional view along a line  33 - 33  shown in  FIG. 32 . 
     The structure of the camera according to the eleventh embodiment is the same as that according to the first embodiment. Therefore, the structures of the entire camera and image pick-up device unit are stated with reference to  FIGS. 1 and 2  and  FIGS. 3 to 5  used for the description of the first embodiment, and are not described in detail by using the same reference numerals. 
     According to the eleventh embodiment, the piezoelectric element  22  in the image pick-up device unit  15  is an electromechanical transducer in which, for example, plate-shaped piezoelectric ceramics is substantially circular-shaped. The piezoelectric element  22  has a first conductive member  22   b  at one surface thereof, namely, at the surface at which it is adhered to the dust-proofing filter  21 , and a second conductive member  22   a  at another surface, namely, at the surface opposed to the surface of the dust-proofing filter  21  (surface at the back side). 
     A part of the first conductive member  22   b  is formed along the side surface of an outer edge side of the piezoelectric element  22  and, further, is formed extending to another surface. The first conductive member  22   b  and the second conductive member  22   a  are members which function as electrodes of the piezoelectric element  22 . 
     That is, according to the eleventh embodiment, as mentioned above, the piezoelectric element  22  is adhered to the predetermined portion in the peripheral portion of the dust-proofing filter  21  by the means such as an adhesive. One surface of the piezoelectric element  22  becomes the adhering surface to the dust-proofing filter  21 . Therefore, a connecting member such as a lead is not connected to the first conductive member  22   b  arranged to the adhering surface. In other words, the one surface of the piezoelectric surface  22  is not conductive to the first conductive member  22   b.    
     Then, in the piezoelectric element  22 , as mentioned above, a part of the first conductive member  22   b  is formed along the side surface on the outer edge of the piezoelectric element  22 . Further, the part of the first conductive member  22   b  is formed extending to the surface on which the second conductive member  22   a  is formed. Thus, the connecting member is easily connected to the first conductive member  22   b.    
     Corresponding thereto, the second conductive member  22   a  formed on another surface of the piezoelectric element  22  is formed in an area excluding the extending portion of the first conductive member  22   b . An insulating portion  65  is provided between the extending portion of the first conductive member  22   b  and the second conductive member  22   a . Thus, the extending portion of the first conductive member  22   b  and the second conductive member  22   a  are constructed not to be conductive on the other surface of the piezoelectric element  22  on which the second conductive member  22   a  is formed. 
     That is, referring to  FIG. 32 , the dust-proofing filter  21  is adhered to the dust-proofing filter supporting member  23  via the piezoelectric element  22  adhered to the dust-proofing filter  21  interposed, by using the adhering means such as the adhesive  31 . In this case, a predetermined portion on the side where the second conductive member  22   a  of the piezoelectric element  22  is abutted onto the supporting portion  23   c  of the dust-proofing filter supporting member  23 . Therefore, the supporting portion  23   c  of the dust-proofing filter supporting member  23  is sometimes arranged extending over the extending portion of the first conductive member  22   b  and the second conductive member  22   a.    
     The dust-proofing filter supporting member  23  forms a part of the sealing structure as mentioned above. A part of the dust-proofing filter supporting member  23  is conductive. Specifically, the dust-proofing filter supporting member  23  is made of a conductive member such as metal or conductive resin, or is formed to be conductive by using means for applying a conductive coating. 
     In this case, the dust-proofing filter supporting member  23  may be conductive at a portion, namely, at least near a portion of the supporting portion  23   c  which is abutted onto the second conductive member  22   a  of the piezoelectric member  22 . 
     Therefore, the extending portion of the first conductive member  22   b  is conductive to the second conductive member  22   a  by arranging the supporting portion  23   c  of the dust-proofing filter supporting member  23  over both the conductive members  22   a  and  22   b . In order to prevent the conductive state of both the conductive members  22   a  and  22   b , an insulating portion  65  is arranged. 
     As described above, the conductive portion of the dust-proofing filter supporting member  23  (sealing structure) is abutted onto the second conductive member  22   a  which is formed onto the surface of the piezoelectric element  22  (electromechanical transducer), thereby establishing the electrical connection therebetween to be conductive. Simultaneously, the above-stated insulating portion  65  disenables the conduction between the first conductive member  22   b  and the second conductive member  22   a.    
     A predetermined voltage is applied to the piezoelectric element  22  by using the dust-proofing filter driving unit  48 , so that the piezoelectric element  22  generates the vibrations which are applied to the dust-proofing filter  21 . 
     In this case, the electrical connection between the first conductive member  22   b  and the second conductive member  22   a  in the piezoelectric element  22  by using the dust-proofing filter driving unit  48  enables the connection between the extending portion of the first conductive member  22   b  and the connecting member such as a lead from the dust-proofing filter driving unit  48 . On the other hand, the dust-proofing filter supporting member  23  electrically connected to the second conductive member  22   a  is connected to the ground, thereby needing no connecting member such as a lead. 
     As described above, according to the eleventh embodiment, the same advantages as those according to the first embodiment are obtained. 
     Further, according to the eleventh embodiment, the piezoelectric element  22  is formed of the plate-shaped electromechanical transducer, the first conductive member  22   b  is arranged on the one surface of the piezoelectric element  22 , and the second conductive member  22   a  is arranged on the other surface thereof. In addition, a part of the first conductive member  22   b  is formed along the side surface on the outer edge of the piezoelectric element  22  and is further extended to the surface side where the second conductive member  22   a  is formed. 
     The conductive portion is arranged to a part of the dust-proofing filter supporting member  23  and is abutted onto the second conductive member  22   a  of the piezoelectric element  22 . In this case, the extending portion of the first conductive member  22   b  and the second conductive member  22   a  are constructed not to be conductive by providing the insulating portion  65  therebetween. 
     With the foregoing structure, the connecting member such as the lead is easily connected to the first conductive member  22   b  and the second conductive member  22   a  is electrically connected to the ground via the dust-proofing filter supporting member  23 . Thus, the connecting means is omitted. 
     The arrangement of the connecting means such as the lead for connecting the piezoelectric element  22  to the dust-proofing filter driving unit  48  for driving the piezoelectric element  22  is simplified. As a result of the simplification, the working time for assembly in the manufacturing processing is reduced and the manufacturing processing such as the reduction of the working processing is simplified. This contributes to the reduction in manufacturing costs. 
     In addition, the dust-proofing structure formed of the dust-proofing filter  21  and the piezoelectric element  22  is simplified, thereby ensuring the stable mechanical accuracy without the variation in manufacturing. 
     According to the eleventh embodiment, the conductive portion of the dust-proofing filter supporting member  23  is abutted onto the second conductive member  22   a  of the piezoelectric element  22 . However, the conductive portion of the dust-proofing filter supporting member  23  may be abutted onto the first conductive member  22   b . Next, an example thereof is described according to the twelfth embodiment of the present invention. 
       FIGS. 34 and 35  are diagrams showing by extracting a part of members forming an image pick-up device unit in a camera according to the twelfth embodiment of the present invention.  FIG. 34  is a perspective view showing by extracting a part of the dust-proofing member, the member for vibration, and the dust-proofing filter supporting member in view of the back side thereof (image pick-up device side).  FIG. 35  is a sectional view along a line  35 - 35  shown in  FIG. 34 . 
     According to the twelfth embodiment, the structure is basically formed in the same manner as that according to the eleventh embodiment. However, unlike the eleventh embodiment, the first conductive member  22   b  in the piezoelectric member  22  is abutted onto the conductive portion of the dust-proofing filter supporting member  23 . Therefore, other structures are not described and illustrated and are referred to those according to the first embodiment. 
     According to the twelfth embodiment, similarly to the piezoelectric element  22  according to the eleventh embodiment, the piezoelectric element  22  is an electromechanical transducer which is made of plate-shaped piezoelectric ceramics with a substantially circular shape. 
     The piezoelectric element  22  comprises the first conductive member  22   b  on one surface thereof (on the side of the dust-proofing filter  21 ) and the second conductive member  22   a  on another surface thereof (on the reversed side of the dust-proofing filter  21 ). Similarly to the eleventh embodiment, a part of the first conductive member  22   b  is formed along the side surface of the outer edge of the piezoelectric element  22  and is extended to another surface thereof. 
     Corresponding thereto, similarly to the eleventh embodiment, the second conductive member  22   a  formed on the other surface of the piezoelectric element  22  is formed in an area excluding the extending portion of the first conductive member  22   b . The insulating portion  65  is provided between the extending portion of the first conductive member  22   b  and the second conductive member  22   a.    
     According to the twelfth embodiment, the conductive portion of the dust-proofing filter supporting portion  23  having at least a conductive part forms a part of the sealing structure and is abutted onto the first conductive member  22   b  formed onto the piezoelectric element  22  (electromechanical transducer). Thus, the electrical connection between the conductive portion of the dust-proofing filter supporting member  23  and the first conductive member  22   b  is assured to be conductive therebetween. Further, the first conductive member  22   b  and the second conductive member  22   a  are constructed not to be conductive by the above-mentioned insulating portion  65 . Other structures are the same as those according to the first and eleventh embodiments. 
     According to the twelfth embodiment, the same advantages as those according to the eleventh embodiment are obtained. 
     Next, a thirteenth embodiment of the present invention will be described. 
       FIG. 36  is a main-part exploded perspective view showing a disassembled part of an image pick-up device unit in a camera according to the thirteenth embodiment of the present invention. 
     According to the thirteenth embodiment, the structure of the camera is basically the same as that according to the first embodiment. Therefore, the structure of the entire camera is illustrated with reference to  FIGS. 1 and 2  used for the description of the first embodiment and is not described in detail by using the same reference numerals for the same structure. Further, according to the thirteenth embodiment, the image pick-up device unit in the camera is the same as that according to any of the first to fifth embodiment. Therefore, the structure of the entire image pick-up device unit is illustrated with reference to  FIGS. 3 to 5 , and the structure of a part of the image pick-up device unit, namely, of the dust-proofing filter supporting member and the dust-proofing filter are illustrated with reference to  FIGS. 16 to 18  used for the fifth embodiment and are described by using the same reference numerals for the same structure. 
     According to the thirteenth embodiment, an image pick-up device unit  15 F in the camera  1  comprises a plurality of members including the shutter unit  14 , similarly to the above-stated embodiments. Referring to  FIGS. 36 , only the main portion is shown and the shutter unit  14  is not shown. 
     Further, referring to  FIG. 36 , for the purpose of showing the positional relationship of the members, the members are arranged near the image pick-up device unit  15 F, and the main circuit board  16  on which image pick-up system electrical circuits such as the image pick-up device  27 , the image signal processing circuit  16   a , and the work memory  16   b  are mounted is shown together. A general main circuit board used in the conventional camera is applied to the main circuit board  16 , and it is not described in detail. 
     The image pick-up device unit  15 F comprises: the image pick-up device  27  comprising the CCD and the like, which obtains the image signal corresponding to light transmitted through the photographing optical system  12   a  and irradiated to the photoelectrically converting surface thereof; the image pick-up device fixing plate  28  comprising a thin-sheet member for fixing and supporting the image pick-up device  27 ; the optical low-pass filter  25  (hereinafter, referred to as an optical LPF) arranged on the side of the photoelectrically converting surface of the image pick-up device  27 , as an optical device which is formed to remove high frequency components from the subject beams transmitted and irradiated through the photographing optical system  12   a ; the low-pass filter supporting member  26  arranged at a peripheral portion between the optical LPF  25  and the image pick-up device  27 , which is made of an almost-frame-shaped elastic member, etc.; the image pick-up device accommodating case member  24  (hereinafter, referred to as the CCD case  24 ) which accommodates, fixes, and holds the image pick-up device  27 , supports the optical LPF  25  (optical device) to be in contact with a peripheral portion to an adjacent portion of the optical LPF  25  and which comes into closely contact with the dust-proofing filter supporting member  23 A at a predetermined portion thereof, which will be described later; the dust-proofing filter supporting member  23 A is arranged in front of the CCD case  24  and comes into contact with the dust-proofing filter  21  (dust-proofing member) at the peripheral portion or the adjacent portion thereof and supports it; the dust-proofing filter  21  as a dust-proofing member opposed and arranged at the predetermined position having the predetermined interval to the optical LPF  25  in front of the optical LPF  25  on the side of the photoelectrically converting surface of the image pick-up device  27 , which is supported by the dust-proofing filter supporting member  23 A; and the piezoelectric element  22  arranged at the peripheral portion of the dust-proofing filter  21 , to the surface on the opposed side of the image pick-up device  27  as a member for vibration for applying predetermined vibrations to the dust-proofing filter  21 , comprising an electromechanical transducer or the like. 
     The dust-proofing filter  21  is airtightly jointed, fixed, and held to the dust-proofing filter supporting member  23 A (one member forming the sealing structure) by the adhesive  31 . In this case, the dust-proofing filter  21  is adhered and fixed to the dust-proofing filter supporting member  23 A at the entire circumference of the peripheral portion on one surface thereof by using the adhesive  31 . 
     An opening  23 Af with a circular or polygon shape is pierced near almost the center of the dust-proofing filter supporting member  23 A. The subject beams transmitted through the photographing optical system  12   a  pass through the opening  23 Af and are set with a size enough to irradiate the photoelectrically converting surface of the image pick-up device  27  on which the beams are set at the back side. 
     A wall portion  23 Ae projecting toward the front side is formed at the peripheral portion of the opening  23 Af with a substantially annular shape. A supporting portion  23 Ac is formed to further be projected toward the front side (refer to  FIGS. 36 and 16  to  18 ). 
     A plurality of projecting portions  23 Aa (three projecting portions according to the thirteenth embodiment) are formed to be projected toward the front side, near an outer peripheral portion in front of the dust-proofing filter supporting member  23 A. The projecting portions  23 Aa function as position regulating members for positioning upon adhering and arranging the dust-proofing filter  21  to the dust-proofing filter supporting member  23 A. 
     The dust-proofing filter  21  is adhered to the piezoelectric member  22  in front of the dust-proofing filter supporting member  23 A by using the adhesive  31  (refer to  FIG. 18 ). 
     In this case, the adhesive  31  is applied all over the end side of the wall portion  23 Ae of the dust-proofing filter supporting member  23 A, that is, at the entire circumference of the annular area. In this status, the dust-proofing filter  21  is adhered from the front side of the dust-proofing filter supporting member  23 A. In this case, the dust-proofing filter  21  is arranged at a predetermined position of the dust-proofing filter supporting member  23 A by moving the outer circumferential portion of the dust-proofing filter  21  along the projecting portions  23 Aa in the optical axis direction. 
     The supporting portion  23 Ac is abutted onto a predetermined position (portion as a node upon vibration) of the dust-proofing filter  21  (actually, the piezoelectric element  22 ). 
     Therefore, the dust-proofing filter supporting member  23 A is airtightly jointed, is fixed to, and is held to the dust-proofing filter  21  by the adhesive  31  in an annular area near the peripheral portion of the dust-proofing filter  21 , that is, at the end portion of the wall portion  23 Ae. 
     Other structures are substantially the same as those according to the first to fifth embodiments. 
     As mentioned above, the circumferential groove  24   d  is airtightly fit to an annular convex portion, with respect to the dust-proofing filter supporting portion  23 A and the CCD case  24 . The dust-proofing filter supporting member  23 A is airtightly jointed to the dust-proofing filter  21  by adhering force of the adhesive  31  via the piezoelectric element  22  interposed. The optical LPF  25  arranged at the CCD case  24  is constructed to be airtight between the peripheral portion in front and the step portion  24   a  of the CCD case  24 . 
     Further, the image pick-up device  27  is arranged at the back side of the optical LPF  25  via the low-pass filter supporting member  26  interposed and thus the airtightness is held between the optical LPF  25  and the image pick-up device  27 . 
     With the above-described structure, therefore, a predetermined air gap portion is formed in a space in which the optical LPF  25  is opposed to the dust-proofing filter  21 . At the same time, a predetermined space portion is formed at the peripheral portion of the optical LPF  25  by the CCD case  24 , the dust-proofing filter supporting member  23 A, and the dust-proofing filter  21 . The predetermined space is a sealed space formed to be projected to the outside of the optical LPF  25 . 
     In this case, the space portion is set to be wider than the above-stated air gap portion. The space containing the air gap portion and the space portion forms a sealing space which is airtightly sealed by the CCD case  24 , the dust-proofing filter supporting member  23 A, the dust-proofing filter  21 , and the optical LPF  25 . 
     According to the thirteenth embodiment, the image pick-up device unit  15 F in the camera forms the sealing structure which forms the sealing space which is substantially sealed, including the air gap portion formed to the peripheral portion of the optical LPF  25  and the dust-proofing filter  21 . The sealing structure is arranged at the peripheral portion of the optical LPF  25  or the outside the adjacent portion thereof. 
     Further, according to the thirteenth embodiment, the sealing structure comprises the dust-proofing filter supporting member  23 A for supporting the dust-proofing filter  21  in contact with the peripheral portion or the adjacent portion thereof and the CCD case  24  arranged for supporting the optical LPF  25  in contact with the peripheral portion or the adjacent thereof and for coming into closely contact with the dust-proofing filter supporting member  23 A at the predetermined portion thereof. 
     According to the thirteenth embodiment, in the camera  1  with the foregoing structure, the dust-proofing filter  21  is opposed to the predetermined position in front of the image pick-up device  27 , and the sealing space is formed at the photoelectrically converting surface of the image pick-up device  27  and the peripheral portion of the dust-proofing filter  21 . Consequently, the adhesion of dust and the like to the photoelectrically converting surface of the image pick-up device  27  is prevented. 
     Dust and the like adhered to the exposed surface in front of the dust-proofing filter  21  are removed by applying a periodic voltage to the piezoelectric element  22  arranged integrally with the peripheral portion of the dust-proofing filter  21  and by thus applying predetermined vibrations to the dust-proofing filter  21 . 
     In this case, the operations upon vibration of the dust-proofing filter  21  by using the piezoelectric element  22  are the same as those according to the first embodiment described with reference to  FIGS. 6 to 11 . 
     As mentioned above, according to the thirteenth embodiment, the same advantages as those according to the first embodiment are obtained. 
     Further, according to the thirteenth embodiment, the adhesive  31  is used as the means for fixing and holding the dust-proofing filter  21  and for airtightly jointing the dust-proofing filter  21  and the dust-proofing filter supporting member  23 A. Thus, the structure is easily simplified and this contributes to the reduction in number of members. Furthermore, this contributes to the simplification of the manufacturing processing and the reduction in manufacturing costs. 
     In the camera  1  according to the thirteenth embodiment, the dust-proofing filter supporting member  23 A and the CCD case  24  are independently formed and they are airtightly fit to each other. However, the present invention is not limited to this and, advantageously, the dust-proofing filter supporting member  23 A and the CCD case  24  are integrally formed as a single member. 
     In addition, according to the thirteenth embodiment, the dust-proofing filter  21  is adhered and fixed to the dust-proofing filter supporting member  23 A by using the adhesive  31 . In this case, the dust-proofing filter  21  is adhered and fixed to the dust-proofing filter supporting member  23 A (sealing structure) at the entire peripheral portion on one surface thereof by using the adhesive  31 . 
     As mentioned above, upon adhering and fixing the dust-proofing filter  21  to the dust-proofing filter supporting member  23 A, the dust-proofing filter  21  is fixed to the entire peripheral portion of the dust-proofing filter  21 , thereby establishing accurate adhesion and fixing. Consequently, a preferable sealing status is ensured. 
     On the other hand, the vibrations are applied to the dust-proofing filter  21  by using the piezoelectric element  22 . As a result of the vibrating action, dust and the like adhered to the outer surface of the dust-proofing filter  21  is removed. 
     According to the thirteenth embodiment, when the entire circumference of the peripheral portion of the dust-proofing filter  21  is adhered and fixed to the dust-proofing filter supporting member  23 A, the vibrations are attenuated by vibrating the dust-proofing filter  21  using the operation of the piezoelectric element  22  in some cases. 
     For example, means is considered as one for suppressing the attenuation of the vibrations while ensuring the adhering force between the dust-proofing filer supporting member  23 A and the dust-proofing filter  21  according to the fourteenth embodiment. 
     That is, according to the fourteenth embodiment of the present invention, a portion of the adhesive  31  adhering between the dust-proofing filter  21  and the dust-proofing filter supporting member  23 A is fixed at a plurality of predetermined positions at the peripheral portion of the dust-proofing filter  21 . 
       FIGS. 37 to 39  are diagrams showing by extracting a part of an image pick-up device unit according to the fourteenth embodiment of the present invention.  FIG. 37  is a front view showing the dust-proofing filter supporting member in the members forming the image pick-up device unit.  FIG. 38  is an exploded perspective view showing the dust-proofing filter supporting member and the dust-proofing filter (dust-proofing member) among the members forming the image pick-up device unit.  FIG. 39  is a main-part sectional view showing an adhering state of the dust-proofing filter supporting member and the dust-proofing filter by using the adhesive at a position along a line  39 - 39  shown in  FIG. 37 . 
     Basically, the structure according to the fourteenth embodiment is formed in the same manner as that according to the thirteenth embodiment. Unlike the structure according to the thirteenth embodiment, an applying portion of the adhesive  31  is provided so as to adhere and fix the dust-proofing filter  21  to the dust-proofing filter supporting member  23 A. Therefore, only the different portion from that according the thirteenth embodiment is shown and the same structure is designated by the same reference numeral and is not described. Further, the structure of the entire camera is neither described nor shown (refer to  FIGS. 1 ,  2 , and  36 ). 
     According to the fourteenth embodiment, the dust-proofing filter (dust-proofing member) is adhered and fixed to the dust-proofing filter supporting member  23 A forming a part of the sealing structure at a plurality of the peripheral portions of the dust-proofing filter  21 . 
     That is, referring to  FIGS. 37 and 38 , the adhesive  31  is applied to three predetermined portions near the supporting portions  23 Ac of the dust-proofing filter supporting member  23 A. In this case, the dust-proofing filter  21  is adhered to the supporting portions  23 Ac in front of the dust-proofing filter supporting member  23 A. Thus, the dust-proofing filter  21  is adhered and fixed to the dust-proofing filter supporting member  23 A at a plurality of the peripheral portions of the dust-proofing filter  21  via the piezoelectric element  22  interposed. Other structures are the same as those according to the thirteenth embodiment. 
     With the above-described structure according to the fourteenth embodiment, the same advantages as those according to the thirteenth embodiment are obtained. Further, the dust-proofing filter  21  is accurately adhered and fixed to the dust-proofing filter supporting member  23 A and the adhering portions are restricted to several portions. Consequently, as compared with the case of adhering the dust-proofing filter supporting member  23 A to the entire circumference of the peripheral portion of the dust-proofing filter  21 , the attenuation of the vibrations of the dust-proofing filter  21  can be suppressed. Therefore, the vibrating action of the dust-proofing filter  21  can be ensured without fail. 
     According to the fourteenth embodiment, the three adhering portions are set. However, the present invention is not limited to this and, advantageously, a plurality of adhering portions may be used. Preferably, in view of assuring the adhering force is minimum and necessary, the number of the adhering portions is at least three or more. 
     According to the example in the thirteenth and fourteenth embodiments, the supporting portions  23 Ac of the dust-proofing filter supporting member  23 A are abutted onto the predetermined positions of the piezoelectric element  22 . 
     However, upon applying the vibrations to the dust-proofing filter  21  by the operation of the piezoelectric element  22 , the resonant frequency of the vibrations is varied depending on the shape, size, plate thickness, and the material of the dust-proofing filter  21  as mentioned above. 
     Further, as described above, preferably, the supporting portions  23 Ac of the dust-proofing filter supporting member  23 A are abutted onto the portions as vibration nodes of the dust-proofing filter  21 . 
     Then, according to the fifteenth embodiment of the present invention, the portions as the vibration nodes of the dust-proofing filter  21  are not the portions to which the piezoelectric element  22  is arranged but predetermined positions on the surface of the dust-proofing filter  21 . 
       FIGS. 40 and 41  are diagrams showing by extracting a part of an image pick-up device unit in a camera according to the fifteenth embodiment of the present invention.  FIG. 40  is a perspective view showing in a state in which the dust-proofing filter is adhered to the dust-proofing filter supporting member among the members forming the image pick-up device unit.  FIG. 41  is a sectional view along a line  41 - 41  shown in  FIG. 40 . 
     According to the fifteenth embodiment, basically, the structure is formed in the same manner as that according to the thirteenth and fourteenth embodiments. The contact position between the dust-proofing filter  21  and the dust-proofing filter supporting member  23 A is different from that according to the thirteenth and fourteenth embodiments upon adhering and fixing the dust-proofing filter  21  to the dust-proofing filter supporting member  23 A. Therefore, only the different portion from that according to the thirteenth and fourteenth embodiments is shown, and the same structure is designated by the same reference numeral and is not described. Further, the structure of the entire camera is neither shown nor described (refer to  FIGS. 1 ,  2 , and  36 ). 
     According to the fifteenth embodiment, the supporting portion  23 Ac of the dust-proofing filter supporting member  23 A directly is abutted onto the surface of the dust-proofing filter  21 . Corresponding thereto, the piezoelectric element  22  is adhered to the surface of the peripheral portion of the dust-proofing filter  21  so as to avoid the supporting portion  23 Ac. 
     The subject beams transmitted through the photographing optical system  12   a  are incident on the dust-proofing filter  21 . After that, the beams reach the photoelectrically converting surface of the image pick-up device  27  and form the subject image thereon. In other words, the dust-proofing filter  21  is arranged on an optical path of the beams contributing to the formation of the subject image. 
     In consideration of the foregoing, at the surface of the dust-proofing filter  21 , so-called coating processing is generally performed, that is, the formation of various thin films such as (a reflection preventing film or electrostatic charge preventing film) for preventing the reflection or the electrostatic charge, and (an infrared cut-off film or ultraviolet cut-off film) for preventing the absorption and the transmission of the infrared or the ultraviolet. 
     In this case, as the coating processing for the dust-proofing filter  21 , various processing formats are considered, for example, processing for forming, as a single member, a thin film having a function of any of the above various thin films, processing for forming a thin film multi-functioned by laminating a plurality of thin films among the various thin films, and processing for forming a thin film multi-functioned among the various thin films. 
     Herein, the reflection preventing film (refereed to as an AR coating) suppresses a reflection ratio of the surface and improves the transmittance by evaporating a multi-layered film obtained by laminating by a thickness of a ¼-wavelength (0.1 to 0.3 μm), for example, 
     silicon oxide (SiO 2 ), 
     titanate oxide (TiO 2 ), and 
     zinc oxide (ZnO 2 ). 
     The surface reflection ratio of a normal glass is approximately 4%. However, the reflection ratio is suppressed to 1% or less by applying the reflection preventing film to the surface. 
     As the electrostatic charge preventing film, a transparent conductive film used for the optical system is applied. The transparent conductive film has the large conductivity and the high translucency in a visible area and, mainly, a visible light average transmittance is about 80% or more and the resistivity is, in many case, 
     about 1×10 −3  Ω·cm or less. 
     The transparent conductive film includes a metal transparent conductive film made of gold (Au), silver (Ag), platinum (Pt), etc., and an oxide semiconductor transparent conductive film made of 
     indium oxide (In 2 O 3 ), 
     tin oxide (SnO 2 ), 
     zinc oxide (ZnO 2 ), 
     etc. 
     The metal transparent conductive film has a problem on the translucency and the film intensity and therefore the optical fields mainly use the oxide semiconductor transparent conductive film. 
     The infrared cut-off film (referred to as an IR cut-off film) reflects infrared light (having wavelength of 670 to 680 nm or more) and transmits light in other wavelength areas. 
     The ultraviolet cut-off film (referred to as a UV cut-off film) reflects ultraviolet light (having wavelength of 390 to 410 nm or less) and transmits light in other wavelength areas. 
     When the surface of the dust-proofing filter  21  is subjected to the coating processing, the adhering force is not sufficiently assured of adhering the piezoelectric element  22  and the supporting portion  23 Ac to the surface of the dust-proofing filter  21 . The thin film formed by the coating processing is likely to be peeled off. In the state in which the piezoelectric element  22  and the supporting portion  23 Ac are adhered, the thin film is peeled off. Further, not only the piezoelectric element  21  but also the dust-proofing filter supporting member  23 A is also likely to be peeled off. 
     Then, according to the fifteenth embodiment, a thin-film non-forming portion  21   nc  (portion shown by a shaded portion in  FIG. 40 ) is provided, that is, the thin-film non-forming portion  21   nc  is not subjected to the coating processing and has no thin film at a portion to which the piezoelectric element  22  and the supporting portion  23 Ac are adhered. Referring to  FIGS. 40 and 41 , a portion shown by the reference numeral  21   nca  shows a portion to which the piezoelectric element  22  is adhered. As shown in  FIGS. 40 and 41 , the supporting portion  23 Ac of the dust-proofing filter supporting member  23 A is adhered to a portion shown by reference numeral  21   ncb.    
     A thin-film forming portion  21   c  corresponds to a portion other than the thin-film non-forming portion  21   nc  on the surface of the dust-proofing filter  21 , that is, a transparent portion capable of transmitting valid beams incident into the image pick-up device  27  from the photographing lens  12   a  with respect to the dust-proofing filter  21 . 
     Upon adhering and fixing the dust-proofing filter supporting member  23 A to the above-formed dust-proofing filter  21 , the supporting portion  23 Ac is abutted onto the thin-film non-forming portion  21   ncb  of the dust-proofing filter  21 . In this state, the adhesive  31  is used to adhere and fix the dust-proofing filter supporting member  23 A to the dust-proofing filter  21 . 
     Other structures are substantially the same as those according to the thirteenth and fourteenth embodiments. 
     With the thus-formed dust-proofing filter  21 , when the dust-proofing filter supporting member  23 A is directly abutted onto the surface of the dust-proofing filter  21  and is adhered thereto, the same advantages as those according to the thirteenth and fourteenth embodiments are obtained. Further, the dust-proofing filter supporting member  23 A is accurately adhered and fixed to the dust-proofing filter  21 . 
     In this case, with regard to the dust-proofing filter  21  and the dust-proofing filter supporting member  23 A, similarly to the case according to the thirteenth embodiment, the dust-proofing filter  21  may be adhered and fixed to the dust-proofing filter supporting member  23 A at the entire circumference of the peripheral portion thereof or, similarly to the case according to the fourteenth embodiment, the dust-proofing filter  21  may be adhered and fixed to the dust-proofing filter supporting member  23 A at a plurality of positions of the peripheral portion thereof. 
     Next, the sixteenth embodiment of the present invention will be described. 
     According to the sixteenth embodiment of the present invention, basically, the structure is the same as that according to the first embodiment but a part of the image pick-up device unit is different. Therefore, the same components as those according to the first embodiment are designated by the same reference numerals and are not described, and only different components are described. The structure of the entire camera will be illustrated with reference to  FIGS. 1 and 2  used for the first embodiment. 
     According to the sixteenth embodiment, an image pick-up device unit in a camera will be described in detail. 
       FIGS. 42 to 44  are diagrams showing by extracting a part of the image pick-up device unit in the camera according to the sixteenth embodiment.  FIG. 42  is a main-part exploded perspective view showing the disassembled image pick-up device unit.  FIG. 43  is a perspective view showing a cut-off part of the assembled image pick-up device unit.  FIG. 44  is a sectional view along a cut-off plane shown in  FIG. 43 . 
     According to the sixteenth embodiment, an image pick-up device unit  15 G in the camera  1  comprises a plurality of members containing the shutter unit  14 , similarly to the above-mentioned embodiments. Therefore, only a main portion of the image pick-up device unit is illustrated in  FIGS. 42 to 44  and the shutter unit  14  is not shown similarly to the first embodiment (refer to  FIGS. 3 to 5 ). 
     For the purpose of showing a positional relationship of the members, referring to  FIGS. 42 to 44 , the members are arranged near the image pick-up device unit  15 G and the main circuit board  16 , on which the image pick-up system electrical circuits such as the image pick-up device  27 , the image signal processing circuit  16   a , and the work memory  16   b  are mounted, is shown together, similarly to  FIGS. 3 to 5  according to the first embodiment. The main circuit board  16  is one of main circuit boards generally used for the conventional cameras, and a detailed description thereof is omitted. 
     The dust-proofing filter supporting member  23  is fixed to the front side of the CCD case  24  by using a screw  23   b  against a screw hole  24   b  of the CCD case  24 . In this case, referring to  FIGS. 42 to 44 , the circumferential groove  24   d  is formed with a substantially annular shape at a predetermined position on the front side of the peripheral portion of the CCD case  24 . On the other hand, a annular-shaped convex portion  23   d  (not shown in  FIG. 42 ) corresponding to the circumferential groove  24   d  of the CCD case  24  is formed with the substantially annular shape all over the entire circumference at a predetermined position of the back surface at the peripheral portion of the dust-proofing filter supporting member  23 . Therefore, the CCD case  24  is airtightly fit to the dust-proofing filter supporting member  23  in an annular-shaped area, namely, in an area having the circumferential groove  24   d  and the annular-shaped convex portion  23   d  by fitting the annular-shaped convex portion  23   d  to the peripheral portion  24   d.    
     The dust-proofing filter  21  is wholly circular- or polygonal-shaped and has at least an area having a predetermined extensity in a radial direction from the center of the dust-proofing filter  21  as a transparent portion. The transparent portion is opposed to the front side of the optical LPF  25  at a predetermined interval. 
     The piezoelectric element  22 , an electromechanical transducer as a predetermined member for vibration for applying the vibrations to the dust-proofing filter  21 , is arranged to the peripheral portion of one surface of the dust-proofing filter  21  (according to the sixteenth embodiment, at the back, that is, the surface on the image pick-up device  27  side) by adhering means such as an adhesive so as to integrate to the dust-proofing filter  21 . The piezoelectric element  22  generates predetermined vibrations of the dust-proofing filter  21  by externally applying a predetermined driving voltage. In other words, the piezoelectric element  22  as the member for vibration actively removes dust and the like adhered to the surface of the dust-proofing filter, thereby functioning as cleaning means for clearing the surface of the dust-proofing filter  21 . 
     Further, the dust-proofing filter  21  is fixed and held by the pressing member  20  made of the elastic member such as a plate-shaped spring so as to airtightly be jointed to the dust-proofing filter supporting member  23 . 
     An adhering member  52  such as an adhesive tape as dust collecting means is integrally arranged to the dust-proofing filter  21  at an outer peripheral portion of a reversed surface of the adhering surface of the piezoelectric element  22  (according to the sixteenth embodiment, the front side, that is, the reversed side of the image pick-up device  27 , in other words, the surface on the arrangement side of the photographing lens), as another surface of the dust-proofing filter  21 , or on the adjacent portion thereof, by using the adhering means such as the adhesive. 
     In this case, a positional relationship among the dust-proofing filter  21 , the piezoelectric element  22  arranged on the one surface (back side) thereof, and the adhering member  52  arranged on the other surface (front side) is shown in the main-part enlarged perspective view of  FIG. 45 . 
     Namely,  FIG. 45  is the main-part enlarged perspective view showing a cut-off part of the image pick-up device unit  15 G in the camera, including a cut-off plane, according to the sixteenth embodiment, further showing the arrangement of the piezoelectric element  22  and the adhering member  52  to the dust-proofing filter  21 . 
     As described above, the adhering member  52  arranged to the predetermined position of the dust-proofing filter  21  captures and collects dust and the like removed from the front side of the dust-proofing filter  21  by adhesive force of the adhering member  52  upon vibration of the dust-proofing filter  21  due to the operation of the piezoelectric element  22  (which will be described later). 
     The adhering member  52  uses an adhesive tape formed by applying to a predetermined supporter, a rubber-system, acrylic-resin-system, or silicone-system adhesive member. 
     The opening  23   f  with a circular or polygonal shape is set substantially in the center of the dust-proofing filter supporting member  23 . The opening  23   f  is set to have a size large enough to pass through the subject beams transmitted through the photographing optical system  12   a  and to irradiate the photoelectrically converting surface of the image pick-up device  27  arranged at the back with the beams. 
     The wall portion  23   e  projecting to the front side is formed with a substantially annular shape at the peripheral portion of the opening  23   f . The supporting portion  23   c  is formed projecting toward the front side on the edge side of the wall portion  23   e.    
     On the other hand, a plurality of (according to the sixteenth embodiment, three) projecting portions  23   a  are formed projecting toward the front side, near an outer peripheral portion in front of the dust-proofing filter supporting member  23 . The projecting portions  23   a  are portions formed to fix the pressing member  20  for fixing and holding the dust-proofing filter  21 . The pressing member  20  is fixed by fastening means such as a fixing screw  20   a  to the edges of the projecting portions  23   a.    
     The pressing member  20  is a member made of the elastic member such as a plate-shaped spring, and a basic end portion of the pressing member  20  is fixed to the projecting portions  23   a . Further, a free end portion thereof is abutted onto an outer peripheral portion of the dust-proofing filter  21 , thereby pressing the dust-proofing filter  21  toward the side of the dust-proofing filter supporting member  23 , that is, in the optical axis direction. 
     In this case, a predetermined portion of the piezoelectric element  22  arranged at the outer peripheral portion at the back of the dust-proofing filter  21  is abutted onto the supporting portion  23   c , thereby regulating the positions of the dust-proofing filter  21  and the piezoelectric element  22  in the optical axis direction. Therefore, the dust-proofing filter  21  is fixed and held to be airtightly jointed to the dust-proofing filter supporting member  23  with the piezoelectric element  22  interposed therebetween. 
     In other words, the dust-proofing filter supporting member  23  is airtightly jointed to the dust-proofing filter  21  via the interposed piezoelectric element  22  by a pressing force generated by the pressing member  20 . 
     As mentioned above, with respect to the dust-proofing filter supporting member  23  and the CCD case  24 , the circumferential groove  24   d  and the annular-shaped convex portion  23   d  (refer to  FIGS. 42 to 44 ) are airtightly fixed. Further, the dust-proofing filter supporting member  23  is airtightly jointed to the dust-proofing filter  21  via the piezoelectric element  22  interposed by the pressing force of the pressing member  20 . The optical LPF  25  arranged to the CCD case  24  is airtightly arranged between the peripheral portion in front of the optical LPF  25  and the step portion  24   a  of the CCD case  24 . Further, the image pick-up device  27  is arranged at the back of the optical LPF  25  via the low-pass filter supporting member  26  interposed. If the image pick-up device  27  is arranged between the optical LPF  25  and the image pick-up device  27 , the airtightness is substantially held. 
     Therefore, in a space formed by opposing the optical LPF  25  and the dust-proofing filter  21 , the predetermined void portion  51   a  is formed as shown in  FIGS. 43 and 44 . Also, the space portion  51   b  is formed on the peripheral side of the optical LPF  25 , that is, by the CCD case  24 , the dust-proofing filter supporting member  23 , and the dust-proofing filter  21 . The space portion  51   b  is a sealed space formed to project toward the outside of the optical LPF  25 . Further, the space portion  51   b  is set to be wider than the void portion  51   a . A space containing the void portion  51   a  and the space portion  51   b  becomes the sealing space  51  which is substantially airtightly sealed by the CCD case  24 , the dust-proofing filter supporting member  23 , the dust-proofing filter  21 , and the optical LPF  25  as mentioned above. 
     In the image pick-up device unit  15 G in the camera  1  according to the sixteenth embodiment, the sealing structure constitutes the sealing space  51  which is formed at the peripheral portion of the optical LPF  25  and the dust-proofing filter  21  and which is substantially sealed, having the void portion  51   a . The sealing structure is arranged outside from the peripheral portion or the adjacent portion of the optical LPF  25 . 
     Further, according to the sixteenth embodiment, the sealing structure comprises the dust-proofing filter supporting member  23  as the first member for supporting the dust-proofing filter  21  in contact with the peripheral portion or an adjacent portion thereof and the CCD case  24  as the second member which supports the optical LPF  25  in contact with the peripheral portion or the adjacent portion thereof and which is arranged closely in contact with the dust-proofing filter supporting member  23  (first member) at a predetermined portion of the CCD case  24 . 
     In the camera  1  with the above-mentioned structure, the dust-proofing filter  21  is opposed at a predetermined position in front of the image pick-up device  27 , and the sealing space  51  at the periphery of the photoelectrically converting surface of the image pick-up device  27  and the dust-proofing filter  21  is sealed. Consequently, the adhesion of dust, etc. to the photoelectrically converting surface of the image pick-up device  27  is prevented. 
     By applying a periodic voltage to the piezoelectric element  22  arranged integrally with the periphery portion of the dust-proofing filter  21  and applying predetermined vibrations to the dust-proofing filter  21 , dust and the like to be adhered to the exposure surface in front of the dust-proofing filter  21  are removed. 
     In this case, the operations upon vibration of the dust-proofing filter  21  by the piezoelectric element  22  are the same as those according to the first embodiment described with reference to  FIGS. 6 to 11 . 
     Generally, almost all dust and the like removed from the surface in front of the dust-proofing filter  21  falls down to the bottom side in the camera  1  due to the force of gravity. Other dust is adhered to the internal members in the camera  1  or is adhered to the surface of the dust-proofing filter  21  again. 
     According to the sixteenth embodiment, in view of the foregoing, the dust and the like removed from the surface of the dust-proofing filter  21  are captured and collected by adhesive force by the adhering member  52  at the outer peripheral portion of the surface in front of the dust-proofing filter  21  or at the adjacent portion thereof. Consequently, this prevents the re-adhesion of the dust and the like removed from the surface of the dust-proofing filter  21  to the surface of the dust-proofing filter  21  or other internal members. 
     As stated above, according to the sixteenth embodiment, the adhesion of dust and the like to the photoelectrically converting surface of the image pick-up device  27  is prevented by forming the sealing structure near the image pick-up device  27 . 
     Among the members forming the sealing structure, the dust-proofing filter  21  is vibrated by the operation of the piezoelectric element  22 , thereby removing dust and the like adhered to the surface in front of the dust-proofing filter  21  by the vibrating action. 
     In addition, the dust and the like removed from the surface of the dust-proofing filter  21  by the operation of the piezoelectric element  22  are captured and collected by the adhering member  52  arranged to the outer peripheral portion of the surface of the dust-proofing filter  21  or to the adjacent portion thereof. Consequently, this prevents the re-adhesion of the dust and the like to the surface of the dust-proofing filter  21  or the surface of the internal members in the camera  1 . 
     According to the sixteenth embodiment, in the image pick-up device unit  15 G in the camera  1 , the vibrations are applied to the dust-proofing filter  21  by applying a periodic voltage to the piezoelectric element  22  integrated with the dust-proofing filter  21 . The vibrations remove the dust and the like adhered to the surface of the dust-proofing filter  21 . 
     The means for removing the dust and the like by applying the vibrations to the dust-proofing filter  21  is highly advantageous to remove relatively large-sized dust particles and the like. However, all the relatively small-sized dust particles and the like adhered to the surface of the dust-proofing filter  21  are not removed without fail only by using the vibrating action of the dust-proofing filter  21 . 
     Then, according to the seventeenth embodiment of the present invention, an image pick-up device unit in a camera comprises cleaning means for actively removing dust and the like adhered to the surface of the dust-proofing filter  21  and for cleaning the surface of the dust-proofing filter  21 . 
       FIGS. 46 to 49  are diagrams showing by extracting a part of the image pick-up device unit in the camera according to the seventeenth embodiment of the present invention.  FIG. 46  is a perspective view showing by extracting a part of the assembled image pick-up device unit.  FIG. 47  is an exploded perspective view showing the dust-proofing filter supporting member and the dust-proofing filter among members forming the image pick-up device unit.  FIG. 48  is a front view showing by extracting a part of the image pick-up device unit.  FIG. 49  is a sectional view along a line  49 - 49  shown in  FIG. 48 . 
     Referring to  FIGS. 46 to 48 , similarly to the case according to the sixteenth embodiment, only a main portion of the image pick-up device unit is shown and the shutter unit ( 14 ) is not shown. 
     Basically, the structure according to the seventeenth embodiment is formed in the same manner as that according to the sixteenth embodiment. Therefore, in the following, only different portions from those according to the sixteenth embodiment are described in detail, and the same reference numerals denote the same members and are not described in detail. The structure of the entire camera is not shown because it is substantially the same as that according to the first embodiment with reference to  FIGS. 1 and 2  used for the description thereof. 
     In the image pick-up device unit  15 G in the camera  1  according to the sixteenth embodiment, the dust-proofing filter  21  and the dust-proofing filter supporting member  23  are airtightly jointed via the piezoelectric element  22  interposed by using pressing force of the pressing member  20  as the elastic member. 
     On the other hand, in an image pick-up device unit  15 H in the camera according to the seventeenth embodiment, the dust-proofing filter  21  and the dust-proofing filter supporting member  23  are airtightly jointed via the piezoelectric element  22  interposed by using adhering force generated by the adhesive  31  (refer to  FIGS. 47 and 49  and to the fifth embodiment) in place of the pressing force of the pressing member  20  (elastic member) according to the sixteenth embodiment. Therefore, corresponding thereto, the dust-proofing filter supporting member  23 C according to the seventeenth embodiment is differently formed from that according to the dust-proofing filter supporting member  23 C according to the sixteenth embodiment. 
     That is, the dust-proofing filter supporting member  23 C as shown in  FIGS. 46 to 49  has an opening  23 Cf which is circular or polygonal near the center thereof. The subject beams transmitted through the photographing optical system ( 12   a ) pass through the opening  23 Cf which is set to have a size enough for the beams to irradiate the photoelectrically converting surface of the image pick-up device  27  arranged at the back, similarly to the case according to the first embodiment. 
     A wall portion  23 Ce projecting toward the front side is substantially annular-shaped at the peripheral portion of the opening  23 Cf. Further, a supporting portion  23 Cc projecting toward the front side is formed on the edge side of the wall portion  23 Ce. The foregoing is substantially the same as that according to the sixteenth embodiment. 
     On the other hand, a plurality of (according to the seventeenth embodiment, three) projecting portions  23 Ca are formed projecting toward the front side, near an outer peripheral portion in front of the dust-proofing filter supporting member  23 C. The projecting portions  23 Ca function as position regulating members for positioning upon adhering and arranging the dust-proofing filter  21  to the dust-proofing filter supporting member  23 C. 
     At a predetermined position of the outer peripheral portion of the dust-proofing filter supporting member  23 C, a supporting base portion  23 Ch is constituted by a supporting shaft  23 Cg projected in the outer edge direction of the dust-proofing filter supporting member  23 C, for swingably supporting a wiper member  53  as cleaning means, which will be described later, in a predetermined direction. 
     The supporting shaft  23 Cg is a shaft member which is projected toward the front side from the supporting base portion  23 Ch and which is implanted integrally with the dust-proofing filter supporting member  23 C. The wiper member  53  is arranged swingably in an arrow X direction shown in  FIGS. 47 and 48  at the edge portion of the supporting shaft  23 Cg. 
     The dust-proofing filter  21  is adhered by the adhesive  31  via the piezoelectric element  22  interposed in front of the dust-proofing filter supporting member  23 C. 
     In this case, the adhesive  31  is applied all over the area of the wall portion  23 Ce excluding the supporting portion  23 Cc in the edge portion in the dust-proofing filter supporting member  23 C, as an annular-shaped area. In this state, the dust-proofing filter  21  is adhered from the front side of the dust-proofing filter supporting member  23 C. The dust-proofing filter  21  is arranged at the predetermined position of the dust-proofing filter supporting member  23 C by moving the outer peripheral portion of the dust-proofing filter  21  along the projecting portion  23 Ca in the optical direction. The supporting portion  23 Cc is abutted onto a predetermined position (portion as a node upon vibration) of the dust-proofing filter  21  (actually, the piezoelectric element  22 ). 
     Therefore, the dust-proofing filter supporting member  23 C is airtightly jointed to the dust-proofing filter  21  by the adhesive  31  in an annular-shaped area near the peripheral portion of the dust-proofing filter  21 , that is, at the edge portion of the wall portion  23 Ce. 
     Further, similarly to the case according to the sixteenth embodiment, the adhering member  52  as dust collecting means is arranged to the surface outer-peripheral portion in front of the dust-proofing filter  21  or to the adjacent thereto. The piezoelectric element  22  as a member for vibration and an electromechanical transducer is arranged at the peripheral portion at the back of the dust-proofing filter  21 . 
     In addition, according to the seventeenth embodiment, as mentioned above, the image pick-up device unit comprises the wiper member  53  as the cleaning means for removing the dust and the like adhered to the surface of the dust-proofing filter  21  and for cleaning the surface of the dust-proofing filter  21 . 
     The wiper member  53  is swingably arranged in the predetermined direction to the edge portion of the supporting shaft  23 Cg implanted to the supporting base portion  23 Ch of the dust-proofing filter supporting member  23 C. A swinging arm portion  53   a  (refer to  FIG. 49 ) of the wiper member  53  is arranged to come into contact with the surface in front of the dust-proofing filter  21 . The swinging arm portion  53   a  moves smoothly within a predetermined range of the surface in front of the dust-proofing filter  21  by swingingly moving the wiper member  53  in the arrow X direction shown in  FIGS. 47 and 48 . 
     Corresponding thereto, the adhering member  52  arranged at the outer peripheral portion on the surface in front of the dust-proofing filter  21  or at the adjacent portion thereof is arranged in an area excluding the area in which the wiper member  53  moves smoothly. Specifically, the adhering member  52  is arranged in an area shown by reference numerals L 1  to L 3  in  FIGS. 46 to 48 . Consequently, the adhering member  52  does not become the obstruction against the smooth movement of the wiper member  53 . 
     The wiper member  53  is driven by a driving motor  54 . The driving motor  54  is controlled by a wiper driving control unit  55  controlled by the CPU  41 . 
     Other structures are the same as those according to the sixteenth embodiment. 
     According to the seventeenth embodiment, with the above-stated structure, similarly to the sixteenth embodiment, the dust-proofing filter  21  is vibrated by applying a periodic voltage to the piezoelectric element  22  under the control of the dust-proofing filter driving unit  48  (refer to  FIG. 2 ) by the CPU  41  at a predetermined timing. As a result, dust and the like adhered to the surface in front of the dust-proofing filter  21  are removed. 
     The dust and the like removed from the surface of the dust-proofing filter  21  are captured and collected by the adhering member  52  provided at the outer peripheral portion on the surface in front of the dust-proofing filter  21  or at the adjacent portion thereof. 
     In addition, the CPU  41  controls a wiper driving control unit  55  (refer to  FIG. 49 ) and drives the driving motor  54  at a predetermined timing, thereby smoothly moving the wiper member  53  in a predetermined area on the surface in front of the dust-proofing filter  21 . As a result, even relatively small-sized dust particles and the like adhered to the surface of the dust-proofing filter  21  are removed and the surface of the dust-proofing filter  21  further becomes clean. 
     The dust and the like removed from the surface of the dust-proofing filter  21  using the operation of the wiper member  53  are captured and collected by the adhering member  52  arranged at the outer peripheral portion on the surface in front of the dust-proofing filter  21  or at the adjacent portion thereof. 
     As mentioned above, almost all dust and the like are removed from the surface in front of the dust-proofing filter  21  both by using the smoothly moving operation of the wiper member  53  and the vibrating action of the dust-proofing filter  21  due to the piezoelectric element  22 , and then is adhered to the adhering member  52 . Thus, the front surface of the dust-proofing filter  21  is maintained clean. 
     According to the seventeenth embodiment, the same advantages as those according to the sixteenth embodiment are obtained. In addition, according to the seventeenth embodiment, almost all dust and the like adhered to the front surface of the dust-proofing filter  21  can be removed by providing the wiper member  53  as the cleaning means. 
     As described above, the adhering member  52  captures and collects substantially all dust and the like which are removed from the front surface of the dust-proofing filter  21 . Therefore, it is possible to prevent the flow of dust and the like in the space of the camera main body  11  and the adhesion of the dust and the like to the surface of the dust-proofing filter  21  and another inner member. 
     Next, a description is given of an image pick-up device unit in a camera according to the eighteenth embodiment of the present invention. 
       FIGS. 50 to 52  are diagrams showing by extracting a part of the image pick-up device unit in the camera according to the eighteenth embodiment.  FIG. 50  is a perspective view showing by extracting a part of the assembled image pick-up device unit.  FIG. 51  is a sectional view showing by extracting a part of the image pick-up device unit.  FIG. 52  is a main-part enlarged perspective view including a partial cut-off plane of the image pick-up device unit and shows each arrangement of the piezoelectric element and a dust collecting electrode to the dust-proofing filter. 
     Referring to  FIGS. 50 and 51 , similarly to the case according to the sixteenth embodiment, only a main portion of the image pick-up device unit is shown and the shutter unit ( 14 ) is not shown. 
     According to the eighteenth embodiment, basically, the structure is substantially the same as that according to the sixteenth embodiment. Therefore, only different components from those according to the sixteenth embodiment are described in detail. The same reference numerals denote the same components and the details are omitted. The structure of the entire camera is not illustrated because it is substantially the same to that according to the sixteenth embodiment, and is referred to  FIGS. 1 and 2  described for the description thereof. 
     According to the eighteenth embodiment, an image pick-up device unit  15 J comprises, as the dust collecting means, the adhering member  52  according to the sixteenth or seventeenth embodiment and two-step charging type electrical dust-collecting means comprising a needle-shaped electrode  57  for electrostatic charging (ionizing) of dust and the like, a dust collecting electrode  56  for absorbing and collecting the electrostatic charged (ionized) dust and the like, and a driving unit  58  for applying a predetermined voltage to the electrodes  56  and  57 . 
     A plurality of needle-shaped electrodes  57  are fixed to a predetermined position of the dust-proofing filter supporting member  23  so that electrodes  57   a  are opposed to the dust collecting electrode  56  arranged to the outer peripheral portion of the front surface of the dust-proofing filter  21  or to the adjacent portion thereof. Corona discharge is caused by applying a predetermined voltage to the needle-shaped electrode  57  by using the driving unit  58 , thereby charging (applying positive (+) charges to) the dust and the like near the corona discharge. 
     The dust collecting electrode  56  is arranged to the outer peripheral portion of the front surface of the dust-proofing filter  21  or to the adjacent portion thereof by using the adhering means such as an adhesive (refer to  FIG. 52 ). Further, the dust collecting electrode  56  comprises a plate-shaped member having the negative electric charge that is constituted by an electrode (+) to which a predetermined voltage is applied and a set earth electrode (−). 
     Therefore, the dust and the like electrostatic charged by the operation of the needle-shaped electrode  57  are absorbed to the dust collecting electrode  56  by Coulomb force (the amount of electric power) in the electric field of the negative-electric-charged dust collecting electrode  56 . 
     In the image pick-up device unit  15 J according to the eighteenth embodiment, the piezoelectric element  22  as the member for vibration for applying the vibration to the dust-proofing filter  21  removes dust and the like adhered to the surface of the dust-proofing filter  21 , and the removed dust and the like are electrostatic charged by the operation of the needle-shaped electrode  57 . The electrostatic charged dust and the like are absorbed and collected to the dust collecting electrode  56 . 
     In the image pick-up device unit  15 J according to the eighteenth embodiment, the cleaning means for cleaning the surface of the dust-proofing filter  21  comprises the piezoelectric element  22  as the member for vibration for removing dust and the like adhered to the surface of the dust-proofing filter  21  and the two-step charging type electric dust-collecting means having the needle-shaped electrode  57 , the dust collecting electrode  56 , and the driving unit  58  for applying the predetermined voltage to the electrodes  56  and  57 . 
     Other structures are the same as those according to the sixteenth embodiment. 
     As mentioned above, according to the eighteenth embodiment, the same advantages as those according to the sixteenth embodiment are obtained. In addition, the electrical dust-collecting means is provided. Thus, the vibrating action of the dust-proofing filter  21  using the member for vibration (piezoelectric element  22 ) absorbs and collects dust and the like removed from the front surface of the dust-proofing filter  21 . Thus, the front surface of the dust-proofing filter  21  is always maintained clean. 
     Incidentally, according to the eighteenth embodiment, similarly to the case according to the first embodiment (refer to  FIG. 2 ), the image pick-up device unit in the camera is a unit comprising a plurality of members including the shutter unit ( 14 ). However, the present invention is not limited to this and the image pick-up device unit may be constructed by omitting the shutter unit ( 14 ). In this case, the camera with the above-described functions is constructed by adopting a lens shutter method i.e., by providing the shutter unit ( 14 ) in the lens barrel ( 12 ). 
     Next, a description is given of an image pick-up device unit in a camera according to the nineteenth embodiment of the present invention. 
     According to the nineteenth embodiment, basically, the structure is substantially the same as that according to the first embodiment and only a part of the image pick-up device unit is different. Therefore, the same components as those according to the first embodiment are designated by the same reference numerals and are not described, and only the different part is described. The structure of the entire camera is referred to  FIGS. 1 and 2  used for the description of the first embodiment. 
     Hereinbelow, a detailed description is given of the image pick-up device unit in the camera according to the nineteenth embodiment. 
       FIGS. 53 to 57  are diagrams showing by extracting a part of the image pick-up device unit in the camera  1  according to the nineteenth embodiment.  FIG. 53  is a main-part exploded perspective view showing the schematic structure of the disassembled image pick-up device unit.  FIG. 54  is a perspective view showing a cut-off part of the assembled image pick-up device unit. Incidentally, the cross section along a cut-off plane in  FIG. 54  is the same as that according to the first embodiment as shown in  FIG. 5  and therefore  FIG. 5  is referred to. It is not illustrated. 
       FIG. 55  is a perspective view showing the assembled image pick-up device unit.  FIG. 56  is a sectional view along a line  56 - 56  in  FIG. 55 .  FIG. 57  is a perspective view showing only the dust-proofing filter supporting member ( 23 ) among the members forming the image pick-up device unit. 
     According to the nineteenth embodiment, an image pick-up device unit  15 K comprises a plurality of members including the shutter unit  14  similarly to the above-described embodiments. However, only a main portion is illustrated and the shutter unit  14  is not shown in  FIGS. 53 to 56 . 
     For the purpose of showing a positional relationship of the components, referring to  FIGS. 53 and 54 , the image pick-up device  27  is loaded while the components are provided near the image pick-up device unit  15 K, and the main circuit board  16  on which image pick-up system electrical circuits including an image pick-up device, comprising the image signal processing circuit  16   a  and the work memory  16   b , are mounted is illustrated. The main circuit board  16  is one of main circuit boards generally used for the conventional cameras, and a detailed description thereof is omitted. 
     In the image pick-up device unit  15 K according to the nineteenth embodiment, by applying the dust-proofing filter  21  by using the operation of the piezoelectric element  22  as the cleaning means, similarly to the image pick-up device unit according to the above embodiments, dust and the like adhered to the exposure surface in front of the dust-proofing filter  21  are removed. 
     Generally, dust and the like removed from the surface in front of the dust-proofing filter  21  fall down to the bottom side in the main body unit  11  of the camera  1  due to the force of gravity. 
     A dust receiving portion (a dust-receiver)  61  is arranged at a predetermined position of the dust-proofing filter supporting member  23  to receive the dust and the like fallen down to the bottom side of the main body  11  after being removed from the dust-proofing filter  21 . 
     Referring to  FIG. 56 , the dust receiving portion  61  is formed with a box-shaped cross-section having an opening  61   a  on one surface, and is arranged integrally with the dust-proofing filter supporting member  23  at a predetermined position near a lower edge of the dust-proofing filter supporting member  23 . That is, the dust receiving portion  61  is arranged at a predetermined position on the bottom in the main body unit  11  of the camera  1 . 
     In this case, the opening  61   a  of the dust receiving portion  61  is set to be directed to the dust-proofing filter  21  arranged in an upper position of the dust receiving portion  61 . Thus, dust and the like fallen down from the dust-proofing filter  21  fall into the dust receiving portion  61  via the opening  61   a  by the operation of gravity. 
     Further, an adhesive  62  of a rubber system, acrylic resin system, or silicone system is arranged to an inner wall surface of the dust receiving portion  61 . The adhesive  62  is set to capture and collect the dust and the like fallen down in the dust receiving portion  61  by its adhesive force. Therefore, the reflow of the dust and the like adhered to the adhesive  62  outside the dust receiving portion  61  is prevented. 
     As mentioned above, according to the nineteenth embodiment, the dust receiving portion  61  for receiving dust and the like fallen down by the vibrating action of the dust-proofing filter  21  using the piezoelectric element  22  is arranged at a predetermined position of the dust-proofing filter supporting member  23  in the image pick-up device unit  15 K. Consequently, the dust and the like fallen down from the surface of the dust-proofing filter  21  by vibrating them are received and collected in the dust receiving portion  61 . 
     Further, the adhesive  62  made of a predetermined material is set in the dust receiving portion  61 . Therefore, the reflow of the dust and the like collected in the dust receiving portion  61  outside the dust receiving portion  61 , that is, into the camera  1  is prevented. Thus, this suppresses the adhesion of dust and the like to the internal members in the camera  1  and the surface of the dust-proofing filter  21  and the surface of the dust-proofing filter  21  is always maintained clean. 
     According to the nineteenth embodiment, the adhesive  62  is set in the dust receiving portion  61  of the dust-proofing filter supporting member  23 , thus to prevent the reflow of dust and the like captured in the dust receiving portion  61  outside the dust receiving portion  61 . 
     On the other hand, according to the twentieth embodiment of the present invention, by devising the shape of the dust receiving portion, the flow of the dust and the like outside the dust receiving portion is suppressed without setting the adhesive therein. 
       FIG. 58  is a main-part enlarged sectional view showing a main portion of an image pick-up device unit in a camera according to the twentieth embodiment of the present invention, that is, showing the structure near the dust receiving portion.  FIG. 58  shows a main-part cross-section of an enlarged portion corresponding to a portion shown by reference numeral  58  shown in  FIG. 56 . 
     According to the twentieth embodiment, basically, the camera is the same as that according to the nineteenth embodiment, but is different from that in the shape of a dust receiving portion ( 61 A). Therefore, the same members as those according to the nineteenth embodiment are designated by the same reference numerals and are not described in detail. 
     According to the twentieth embodiment, the dust receiving portion  61 A arranged at the predetermined position of the dust-proofing filter supporting member  23  functions as a portion for receiving dust and the like fallen down from the surface of the dust-proofing filter  21  by the vibrating action of the dust-proofing filter  21  using the piezoelectric element  22 , similarly to the nineteenth embodiment. 
     Referring to  FIG. 58 , in the dust receiving portion  61 A, the cross section near the opening  61 Aa is formed with a funnel shape. That is, a funnel-shaped portion  61 Ab has a shape to easily receive dust and the like in the dust receiving portion  61 A. The funnel-shaped portion  61 Ab is conjoined to a hollow portion  61 Ac having a cross section which is rectangular-shaped via a passage  61 Ad. 
     The opening  61 Aa is formed with a relatively wide opening to accurately receive the dust and the like fallen down from the dust-proofing filter  21 . On the other hand, the passage  61 Ad conjoining between the funnel-shaped portion  61 Ab and the hollow portion  61 Ac is formed with a relatively narrow passage so as not to reflow dust and the like in the hollow portion  61 Ac outside. 
     The hollows portion  61 Ac is formed with a relatively wide volume so as to collect too much dust and the like. 
     Further, the passage  61 Ad is formed such that the cross section thereof has a predetermined angle in the vertical direction. That is, the arrangement position of the opening  61 Aa and the arrangement position of the hollow portion  61 Ac correspond to the positions shifted in the vertical direction. This is devised considering that the main body unit  11  always does not have the same position upon using and carrying the camera  1 . 
     That is, by arranging the opening  61 Aa and the hollow portion  61 Ac at the positions shifted in the vertical direction, the dust and the like collected in the hollow portion  61 Ac are not easily flowed out upon using or carrying the camera  1  upside down. 
     In the dust receiving portion  61 A with the above-mentioned shape, the dust and the like entering from the opening  61 Aa easily enter the inside of the hollow portion  61 Ac via the passage  61 Ad from the funnel-shaped portion  61 Ab. On the other hand, the dust and the like entering the inside of the hollow portion  61 Ac are not easily flowed out. 
     Other structures are the same as those according to the nineteenth embodiment. 
     As mentioned above, according to the twentieth embodiment, by devising the shape of the dust receiving portion  61 A, the out-flow of dust and the like to the dust receiving portion  61 A is easily suppressed without providing the adhesive. 
     According to the embodiments, the dust receiving portions  61  and  61 A are arranged at the predetermined positions on the bottom of the camera  1 . The arrangement positions are set in views of the position of the camera  1  and of the gravitation upon using and carrying it, and are set to receive more dust. 
     Therefore, the dust receiving portions  61  and  61 A are arranged not only at the predetermined positions on the bottom of the camera  1  as shown according to the embodiments but also at positions near the peripheral portion of the dust-proofing filter supporting member  23 , that is, at positions on both sides of the camera  1  or either side of them. Thus, the advantages for collecting dust and the like are further obtained. 
     Next, a description is given of an image pick-up device unit in a camera according to the twenty-first embodiment of the present invention. 
       FIGS. 59 to 61  are diagrams showing by extracting a part of the image pick-up device unit in the camera according to the twenty-first embodiment of the present invention.  FIG. 59  is a main-part exploded perspective view showing the disassembled image pick-up device unit.  FIG. 60  is a perspective view showing a cut-off part of the assembled image pick-up device unit.  FIG. 61  is a sectional view along a cut-off plane in  FIG. 60 . 
     According to the twenty-first embodiment, an image pick-up device unit  15 L in a camera comprises a plurality of members including the shutter unit  14  similarly to the embodiments. Therefore, only a main portion is illustrated in  FIGS. 59 to 61  and the shutter unit  14  is not described. For the purpose of showing the positional relationship of members, the main circuit board  16  arranged near the image pick-up device unit  15 L is shown together. The main circuit board  16  is one of main circuit boards generally used for the conventional cameras, and a detailed description thereof is omitted. 
     According to the twenty-first embodiment, basically, the structure is the same as that according to the first embodiment and only a part of the image pick-up device unit is different. Therefore, the same components as those according to the first embodiment are designated by the same reference numerals and only a different portion is described. The structure of the entire camera is referred to  FIGS. 1 and 2  used for the description of the first embodiment. 
     A detailed description is given of an image pick-up device unit  15 L in a camera according to the twenty-first embodiment. 
     According to the twenty-first embodiment, the image pick-up device unit  15 L comprises the image pick-up device unit according to the first embodiment, and a soft member  61  made of circular-shaped rubber on the supporting portion  23   c  as a portion at which the dust-proofing filter supporting member  23  is abutted onto the dust-proofing filter  21  (or the piezoelectric element  22 ) between the dust-proofing filter supporting member  23  as the main portion of the sealing structure and the dust-proofing filter  21  (or the piezoelectric element  22 ). 
     In this case, the soft member  61  provided at the edge of the supporting portion  23   c  of the dust-proofing filter supporting member  23  is abutted onto a predetermined portion of the piezoelectric element  22  arranged at the outer peripheral portion at the back of the dust-proofing filter  21 . Thus, the positions of the dust-proofing filter  21  and the piezoelectric element  22  are regulated in the optical direction. Therefore, the dust-proofing filter  21  is fixed and held to airtightly be jointed to the dust-proofing filter supporting member  23  via the piezoelectric element  22  and the soft member  61  interposed. 
     In other words, the dust-proofing filter supporting member  23  is airtightly jointed to the dust-proofing filter  21  via the piezoelectric element  22  and the soft member  61  by elastic force caused by the pressing member  20 . 
     As mentioned above, in the image pick-up device unit  15 L in the camera according to the twenty-first embodiment, the sealing structure is formed to seal the sealing space  51  (space portion) containing the portion (void portion  51   a ) formed by opposing the image pick-up device unit  27  and the dust-proofing filter  21  and the space portion  51   b  which is substantially sealed at the optical LPF  25  and the dust-proofing filter  21 . The sealing structure is arranged at the outside from the peripheral portion or the adjacent portion of the optical LPF  25 . 
     That is, according to the twenty-first embodiment, the sealing structure comprises the dust-proofing filter  21 , the piezoelectric element  22 , the dust-proofing filter supporting member  23  for supporting the dust-proofing filter  21  in contact with the peripheral portion or the adjacent portion thereof, the CCD case  24  arranged for supporting the optical LPF  25  in contact with the peripheral portion or the adjacent portion thereof and for coming into contact with the dust-proofing filter supporting member  23  at its predetermined portion, the pressing member  20  for pressing the dust-proofing filter  21  (and the piezoelectric element  22 ) to the dust-proofing filter supporting member  23 , and the like. 
     According to the twenty-first embodiment, in the camera with the foregoing structure, the dust-proofing filter  21  is opposed at the predetermined position to the front of the image pick-up device  27  so as to seal the sealing space  51  formed at the photoelectrically converting surface of the image pick-up device  27  and the peripheral portion of the dust-proofing filter  21 . Thus, the adhesion of dust to the photoelectrically converting surface of the image pick-up device  27  is prevented. 
     Dust adhered to the exposing surface in front of the dust-proofing filter  21  is removed by applying a periodic voltage to the piezoelectric element  22  arranged integrally with the peripheral portion of the dust-proofing filter  21  and by applying a predetermined vibration to the dust-proofing filter  21 . 
     Similarly to the above embodiments, preferably, the supporting portion  23   c  of the dust-proofing filter supporting member  23  is abutted on the node of the vibration of the dust-proofing filter  21 . The position of the portion as the node of the vibration of the dust-proofing filter  21  is varied depending on the size (thickness dimension or diameter) of the dust-proofing filter  21  or on the size of the piezoelectric element  22  for vibrating the dust-proofing filter  21 . 
     Therefore, according to the twenty-first embodiment, in addition to the foregoing, the soft member  61  arranged to the supporting portion  23   c  of the dust-proofing filter supporting member  23  is abutted onto the piezoelectric element  22 . Further, the soft member  61  may be abutted onto the predetermined position on the surface of the dust-proofing filter  21  depending on various conditions. 
     According to the twenty-first embodiment, the same advantages as those according to the first embodiment are obtained. 
     Further, according to the twenty-first embodiment, the soft member  61  such as rubber is arranged to the contact portion between the dust-proofing filter supporting member  23  (main body unit of the sealing structure) and the dust-proofing filter  21  (or the piezoelectric element  22 ). 
     Therefore, with the above-described structure, the attenuation of the vibrations of the dust-proofing filter  21  is suppressed at the contact portion where the dust-proofing filter  21  or the piezoelectric element  22  comes into contact with the dust-proofing filter supporting member  23  (main body unit of the sealing structure) upon applying the vibrations to the dust-proofing filter  21  by the operation of the piezoelectric element  22 . 
     Next, a description is given of an image pick-up device unit in a camera according to the twenty-second embodiment of the present invention. 
       FIGS. 62 and 63  are diagrams showing by extracting a part of the image pick-up device unit in the camera according to the twenty-second embodiment of the present invention.  FIG. 62  is a perspective view showing a cut-off part of the assembled main body unit of the sealing structure (dust-proofing filter supporting member), the dust-proofing filter, and the piezoelectric element among the members forming the image pick-up device unit.  FIG. 63  is a sectional view along a line  63 - 63  shown in  FIG. 62 . 
     According to the twenty-second embodiment, basically, the structure is the same as that according to the twenty-first embodiment, and only a dust-proofing filter supporting member  23 D as the main body unit of the sealing structure is different. Therefore, the same structure as that according to the twenty-first embodiment is designated by the same reference numeral and is not described. The structure of the entire camera is not illustrated and is referred to  FIGS. 1 and 2  used for the description of the first embodiment. 
     Referring to  FIGS. 62 and 63 , according to the twenty-second embodiment, similarly to the twenty-first embodiment, the circular-shaped soft member  61  is arranged to the edge portion of a supporting portion  23 Dc and the soft member  61  is abutted on the piezoelectric element  22 . 
     According to the twenty-second embodiment, in the dust-proofing filter supporting member  23 D, a groove portion  23 Dm having a substantially C-shaped cross-section as shown in  FIG. 63  is formed to the entire circumference on the inner peripheral surface of a wall portion  23 De. Thus, the supporting portion  23 Dc is formed with the softness in the direction of an arrow X as shown in  FIG. 63 . 
     Other structures are the same as those according to the twenty-first embodiment. 
     According to the twenty-second embodiment, in the image pick-up device unit, similarly to the twenty-first embodiment, the dust-proofing filter  21  is periodically vibrated by applying a predetermined periodic voltage to the piezoelectric element  22  at a predetermined timing. In this case, the dust-proofing filter  21  is vibrated, conceptually, in the direction of the arrow X as shown in  FIG. 63 . 
     According to the twenty-second embodiment, similarly to the twenty-first embodiment, the soft member  61  such as rubber is arranged to the contact portion between the dust-proofing filter supporting member  23 D (main body unit of the sealing structure) and the dust-proofing filter  21  (or the piezoelectric element  22 ). Further, the groove portion  23 Dm is formed to the predetermined position of the wall portion  23 De in the dust-proofing filter supporting member  23 D. Thus, the dust-proofing filter  21  (or the piezoelectric element  22 ) is supported against the dust-proofing filter supporting member  23 D with softness and the movement of the dust-proofing filter  21  (or the piezoelectric element  22 ) in the direction of the arrow X as shown in  FIG. 63 , that is, the attenuation of the vibration is suppressed. 
     Next, a description is given of an image pick-up device unit in a camera according to the twenty-third embodiment of the present invention. 
       FIGS. 64 to 66  show the twenty-third embodiment of the present invention.  FIG. 64  is a perspective view showing by extracting the image pick-up device unit in the camera according to the twenty-third embodiment.  FIG. 65  is a sectional view along a line  65 - 65  as shown in  FIG. 64 .  FIG. 66  is an enlarged perspective view showing the adjacent portion of the contact portion between the main body unit of the sealing structure (dust-proofing filter supporting member) and the dust-proofing member (dust-proofing filter) in the image pick-up device unit, including the cross section of the adjacent portion of the contact portion. 
     According to the twenty-third embodiment, basically, the structure is the same as that according to the twenty-first embodiment. However, according to the twenty-third embodiment, the soft member  61  according to the twenty-first embodiment is excluded and a dust-proofing filter supporting member  23 E as the main body unit of the sealing structure functions as the soft member  61  according to the twenty-first embodiment. Therefore, the same structure as that according to the first embodiment is designated by the same reference numeral and is not described. The structure of the entire camera is not illustrated and is referred to  FIGS. 1 and 2 . 
     In an image pick-up device unit  15 M according to the twenty-third embodiment, the dust-proofing filter supporting member  23 E as the main body unit of the sealing structure is made of a soft material having the softness of hard rubber. Corresponding thereto, according to the twenty-first embodiment, the soft member  61  according to the twenty-first embodiment is excluded. 
     The dust-proofing filter  21  is supported with the softness via the piezoelectric element  22  interposed by the supporting portion  23   c  formed at the edge portion of the wall portion  23   e  of the dust-proofing filter supporting member  23 E. 
     Other structure is the same as that according to the first embodiment. 
     Therefore, according to the twenty-third embodiment, the soft member  61  according to the twenty-first embodiment is removed and only the dust-proofing filter supporting member  23 E itself is made of the soft material. Thus, the same advantages as those according to the twenty-first embodiment are obtained. This reduces the number of members and contributes to the simplification of the assembling process and to the reduction in manufacturing costs. 
     As means for supporting the dust-proofing filter  21  with the softness, the dust-proofing filter supporting member  23 E is made of the soft material. In addition, at least the adjacent portion of the wall portion  23   e  and the supporting portion  23   c  in the dust-proofing filter supporting member  23 E are made of the soft material. Thus, the same advantages are obtained. 
     Next, a description is given of an image pick-up device unit in a camera according to the twenty-fourth embodiment of the present invention. 
       FIGS. 67 to 69  are sectional views of the image pick-up device unit according to the twenty-fourth embodiment of the present invention.  FIG. 67  is a sectional view showing a normal status in which the voltage is not applied to the piezoelectric element in the image pick-up device unit.  FIG. 68  is a sectional view showing a status in which the positive voltage or the negative voltage is applied to the piezoelectric element in the image pick-up device unit. FIG.  69  is a sectional view showing a status in which the negative voltage or the positive voltage is applied to the piezoelectric element. 
     The sectional views shown in  FIGS. 67 to 69  show the cross section at a portion along a line  65 - 65  shown in  FIG. 64  used for the description of the twenty-third embodiment. 
     According to the twenty-fourth embodiment, basically, the structure is the same as that according to the twenty-third embodiment. According to the twenty-fourth embodiment, only the structure of a dust-proofing filter supporting member  23 F as the main body unit forming the sealing structuring in an image pick-up device unit  15 N is slightly different. The same structure as that according to the twenty-third embodiment is designated by the same reference numeral and is not described in detail. The structure of the entire camera is not illustrated and is referred to  FIGS. 1 and 2  used for the description of the first embodiment. 
     In the image pick-up device unit  15 N in the camera according to the twenty-fourth embodiment, the sealing structure is provided for sealing the predetermined sealing space  51  at the peripheral portion of the image pick-up device unit  27  and the dust-proofing filter  21  so that the almost-sealed void portion  51   a  is structured at the opposed portion of the dust-proofing filter  21  and the image pick-up device  27 . 
     Similarly to the above embodiments, the dust-proofing filter  21  is vibrated by applying a predetermined periodic voltage to the piezoelectric element  22 . 
     According to the twenty-fourth embodiment, in the image pick-up device unit  15 N, a base portion  23 Fs of a projecting portion  23 Fa is elastically formed for attaching the pressing member  20  of the dust-proofing filter supporting member  23 F. Therefore, the base portion  23 Fs of the projecting portion  23 Fa is formed, for example, with concertinas, thus forming a retracting structure for retraction by a predetermined amount in the direction of arrows X 1  and X 2  shown in  FIGS. 68 and 69 . 
     Other structure is the same as that according to the twenty-third embodiment. 
     With the above-mentioned structure, the operation of the image pick-up device unit  15 N of the camera according to the twenty-fourth embodiment is as follows. 
     First, in the normal status (the status shown in  FIG. 67 ) in which the voltage is not applied to the piezoelectric element  22  in the image pick-up device unit  15 N, the positive (+) voltage, for example, is applied to the piezoelectric element  22 , thus to enter the status shown in  FIG. 68 . 
     In this status, the dust-proofing filter  21  is bent toward the image pick-up device  27  and the optical LPF  25 . Thus, the adjacent portion of the center of the dust-proofing filter  21  is extremely in contact with the front surface of the CCD case  24 . On the other hand, force acts in the direction of the arrow X 1  shown in  FIG. 68  near the peripheral portion of the dust-proofing filter  21 . 
     The elastic force acts near the peripheral portion of the dust-proofing filter  21 , whereas the dust-proofing filter  21  is directed toward the image pick-up device  27  and the optical LPF  25  by the pressing member  20 . The base end portion of the pressing member  20  is fixed at a distal end portion of the projecting portion  23 Fa by the fixing screw  20   a . Therefore, the force acting near the peripheral portion of the dust-proofing filter  21  retracts the projecting portion  23 Fa in the direction of the arrow X 1  against the elastic force of the pressing member  20 . The retraction of the projecting portion  23 Fa suppresses the attenuation of the vibrations of the dust-proofing filter  20 . 
     On the other hand, in the normal status (the status shown in  FIG. 67 ) in which the voltage is not applied to the piezoelectric element  22  in the image pick-up device unit  15 N or in the status shown in  FIG. 68 , the application of the voltage to the piezoelectric element  22  is reset and the status returns to that shown in  FIG. 67 . Then, for example, the negative voltage is applied to the piezoelectric element  22  in the image pick-up device unit  15 N, thereby entering the status shown in  FIG. 69 . 
     In this status, the dust-proofing filter  21  is bent in the direction in which the dust-proofing filter  21  is leaving from the optical LPF  25 . Thus, the adjacent portion of the center of the dust-proofing filter  21  is remote from the CCD case  24 . On the other hand, the force acts in the direction of the arrow X 2  shown in  FIG. 69  near the peripheral portion of the dust-proofing filter  21 . 
     In this case, the force acting near the peripheral portion of the dust-proofing filter  21  acts in the direction in which the projecting portion  23 F is constricted in the direction of the arrow X 2 . Thus, the constriction of the projecting portion  23 Fa suppresses the attenuation of the vibration of the dust-proofing filter  20 . 
     According to the twenty-fourth embodiment, the same advantages as those according to the twenty-third embodiment are obtained. Further, in order to attach the pressing member  20 , the base portion  23 Fs of the projecting portion  23 Fa arranged to the dust-proofing filter supporting member  23 F can be elastic. Consequently, upon vibration of the dust-proofing filter  21  by the operation of the piezoelectric element  22 , the attenuation of the vibrations is suppressed and the vibrations are stably ensured. 
     According to the twenty-first to twenty-fourth embodiments, the soft material forms the contact portion of the dust-proofing member (dust-proofing filter) or the member for vibration (piezoelectric element) and the main body unit of the sealing structure (dust-proofing filter supporting member) of the sealing structure, the dust-proofing member or the member for vibration is supported to the main body portion of the sealing structure with softness. However, the attenuation of the vibrations of the dust-proofing member (dust-proofing filter) is suppressed by using another means. Next, this example is described according to the twenty-fifth embodiment of the present invention. 
       FIGS. 70 and 71  are diagrams showing the twenty-fifth embodiment of the present invention.  FIG. 70  is a main-part exploded perspective view showing a disassembled image pick-up device unit according to the twenty-fifth embodiment.  FIG. 71  is an enlarged perspective view showing the adjacent portion of the contact portion of the main body unit in the sealing structure (dust-proofing filter supporting member) and the dust-proofing member (dust-proofing filter) in the image pick-up device unit, including the cross section thereof. 
     According to the twenty-fifth embodiment, the structure is basically the same as that according to the twenty-first embodiment. The dust-proofing filter supporting member  23 G as the main body unit of the sealing structuring, the pressing member  20 A for pressing the dust-proofing filter  21  as the dust-proofing member toward the dust-proofing filter supporting member  23 G, and the arrangement position of the soft member  62  as the means for suppressing the attenuation of the vibration of the dust-proofing filter  21  are different from those according to the twenty-first embodiment. Other structure is the same as that according to the twenty-first embodiment. Therefore, the same structure as that according to the twenty-first embodiment is designated by the same reference numeral and is not described in detail. The structure of the entire camera is not illustrated and is referred to  FIGS. 1 and 2  used for the description of the first embodiment. 
     According to the twenty-fifth embodiment, in an image pick-up device unit  15 P, the dust-proofing filter supporting member  23 G forming the main body unit of the sealing structure is fixed to the screw hole  24   b  of the CCD case  24  by using the screw  23   b  in front of the CCD case  24 . In this case, referring to  FIG. 71 , the CCD case  24  and the dust-proofing filter supporting member  23 G are airtightly fit to each other in an annular area by fitting the circumferential groove  24   d  formed in front of the CCD case  24  to the annular convex portion  23   d  formed at the back of the dust-proofing filter supporting member  23 G, similarly to the case according to the twenty-first embodiment. 
     The dust-proofing filter supporting member  23 G has an opening  23   f  which is circularly or polygonally pierced near the center thereof. The subject beams transmitted through the photographing optical system  12   a  pass through the opening  23   f  which is set to have a size large enough for the beams to irradiate the photoelectrically converting surface of the image pick-up device  27  arranged at the back. 
     The wall portion  23   e  projecting toward the front surface is substantially annular at the peripheral portion of the opening  23   f . Further, the supporting portion  23   c  projecting toward the front surface is formed at the edge portion of the wall portion  23   e.    
     On the other hand, a plurality of (according to the twenty-fifth embodiment, three) projecting portions  23 Gg are formed projecting toward the front side, near an outer peripheral portion in the front of the dust-proofing filter supporting member  23 G. 
     Referring to  FIG. 70 , the projecting portions  23 Gg are formed to fix a pressing member  23 A for fixing and holding the dust-proofing filter  21  by the screw. The pressing member  20 A is fixed to the screw hole formed to the projecting portions  23 Gg by fastening means such as the fixing screw  20   a . The projecting portions  23 Gg function as position regulating members for positioning upon adhering and arranging the dust-proofing filter  21  to the dust-proofing filter supporting member  23 G. 
     The dust-proofing filter  21  is pressed toward the dust-proofing filter supporting member  23 G for being fixed and held, by the pressing member  20 A which is made of an elastic member such as a plate-shaped spring to airtightly be jointed to the dust-proofing filter supporting member  23 G and which is circularly formed. 
     That is, the pressing member  20 A is made of the elastic member such as the plate-shaped spring with a circular shape. A plurality of (three, according to the twenty-fifth embodiment) convex pieces  20 Ab are projected toward the outside at the peripheral portion of the pressing member  20 A. Piercing holes are set to the convex pieces  20 Ab to penetrate the fixing screw  20   a.    
     The dust-proofing filter  21  is arranged at a predetermined position of the dust-proofing filter supporting member  23 G. Then, the pressing member  20 A is fixed by using the screw. In this case, the dust-proofing filter  21  is easily arranged at the predetermined position of the dust-proofing filter supporting member  23 G by moving the peripheral portion of the dust-proofing filter  21  in the optical direction along the projecting portions  23 Gg. 
     The supporting portion  23   c  is abutted on the predetermined position (portion as a node upon vibration) of the dust-proofing filter  21  (actually, the piezoelectric element  22 ). 
     In this status, by overlapping and arranging the pressing member  20 A to the dust-proofing filter  21 , the dust-proofing filter  21  is sandwiched between the pressing member  20 A and the supporting portion  23   c  of the dust-proofing filter supporting member  23 G. 
     Further, the soft member  62  made of rubber, which is circularly formed at a predetermined position, is sandwiched between the pressing member  20 A and the dust-proofing filter  21 . The soft member  62  is adhered to a predetermined position (portion as a node for vibration of the dust-proofing filter  21 ) near the peripheral portion of the surface on the side of the photographing optical system  12   a  of the dust-proofing filter  21 , or to a predetermined position on the side of one surface of a plain-plate portion of the pressing member  20 A, that is, on the opposed side of the dust-proofing filter  21 , by using the adhering means such as the adhesive or a two-sided tape. 
     In this status, by fixing the pressing member  20 A to the screw holes of the projecting portions  23 Gg by using the fixing screw  20   a , a circular plate-shaped portion of the pressing member  20 A is abutted on a predetermined portion of the dust-proofing filter  21  and presses the dust-proofing filter  21  toward the dust-proofing filter supporting member  23 G by its elastic force. 
     In this case, a predetermined portion of the piezoelectric element  22  arranged at the peripheral portion at the back of the dust-proofing filter  21  is abutted on the supporting portion  23   c , thereby regulating the positions of the dust-proofing filter  21  and the piezoelectric element  22  in the optical direction. Thus, the dust-proofing filter  21  is fixed and held to airtightly be jointed to the dust-proofing filter supporting member  23 G via the piezoelectric element  22  interposed. 
     A holding structure for pressing the peripheral portion of the dust-proofing filter  21  to press and fix the dust-proofing filter  21  (dust-proofing member) to the dust-proofing filter supporting member  23 G (sealing structure) comprises the pressing member  20 A, the projecting portions  23 Gg of the dust-proofing filter supporting member  23 G, and the like. 
     Other structure is the same as that according to the twenty-first embodiment. The image pick-up device unit  15 P in the camera according to the twenty-fifth embodiment is operated in the same manner as that according to the twenty-first embodiment and removes the dust and the like adhered to the surface of the dust-proofing filter  21 . 
     As mentioned above, in the image pick-up device unit  15 P according to the twenty-fifth embodiment, the same advantages as those according to the twenty-first embodiment are obtained. 
     According to the twenty-fifth embodiment, the soft member  62  is arranged at the predetermined position between the pressing member  20 A and the dust-proofing filter  21 , thereby easily suppressing the vibrations of the dust-proofing filter  21 . 
     Next, a description is given of an image pick-up device unit in a camera according to the twenty-sixth embodiment of the present invention. 
     According to the twenty-sixth embodiment, basically, the structure is the same as that according to the twenty-fifth embodiment and only a part of the image pick-up device unit is slightly different. Therefore, the same structure as that according to the twenty-fifth embodiment is designated by the same reference numeral. The structure of the entire camera is referred to  FIGS. 1 and 2  used for the description of the first embodiment. 
       FIGS. 72 and 73  are diagrams showing by extracting a part of the image pick-up device unit in the camera according to the twenty-sixth embodiment of the present invention.  FIG. 72  is a main-part exploded perspective view showing the disassembled image pick-up device unit.  FIG. 73  is a main-part enlarged perspective view showing by extracting a part of the image pick-up device unit, including an enlarged portion of the dust-proofing member and an attaching portion of the pressing member. 
     According to the twenty-sixth embodiment, an image pick-up device unit  15 Q in the camera comprises members including the shutter unit  14  according to the above-mentioned embodiments. However, referring to  FIG. 72 , only the main portion is illustrated and the shutter unit  14  is not illustrated. For the purpose of showing the positional relationship of the members, referring to  FIG. 72 , the main circuit board  16  provided near the image pick-up device unit  15 Q is illustrated together. The main circuit board  16  is one of main circuit boards generally used for the conventional cameras, and a detailed description thereof is omitted. 
     A detailed description is given of the image pick-up device unit  15 Q in the camera according to the twenty-sixth embodiment. 
       FIGS. 72 and 73  are diagrams showing by extracting a part of the image pick-up device unit in the camera according to the twenty-sixth embodiment.  FIG. 72  is a main-part exploded perspective view showing the disassembled image pick-up device unit.  FIG. 73  is a main-part enlarged perspective view showing by extracting a part of the image pick-up device unit, including an enlarged portion of the dust-proofing member and the attaching portion of the pressing member. 
     According to the twenty-sixth embodiment, the image pick-up device unit  15 Q in the camera  1  comprises members including the shutter unit  14  as mentioned above. However, referring to  FIG. 72 , only the main portion is illustrated and the shutter unit  14  is not illustrated. For the purpose of showing the positional relationship of the members, referring to  FIG. 72 , the main portion is provided near the image pick-up device unit  15 Q, the image pick-up device  27  is loaded. Further, the main circuit board  16  to which an image pick-up system electrical circuit containing the image signal processing circuit  16   a  and the work memory  16   b  is illustrated together. The main circuit board  16  is of a type generally used for conventional cameras, and a detailed description thereof is omitted. 
     The image pick-up device unit  15 Q comprises: the image pick-up device  27  comprising the CCD and the like, which obtains the image signal corresponding to light transmitted through the photographing optical system  12   a  and irradiated to the photoelectrically converting surface; the image pick-up device fixing plate  28  comprising a thin-sheet member for fixing and supporting the image pick-up device  27 ; the optical low-pass filter (hereinafter, referred to as an optical LPF)  25  arranged on the side of the photoelectrically converting surface of the image pick-up device  27 , as an optical device which is formed to remove high frequency components from the subject beams transmitted and irradiated through the photographing optical system  12   a ; the low-pass filter supporting member  26  provided in the periphery between the optical LPF  25  and the image pick-up device  27 , which is made of substantially-frame-shaped elastic members; the image pick-up device accommodating case member (hereinafter, referred to as the CCD case)  24  which accommodates, fixes, and holds the image pick-up device  27 , supports the optical LPF  25  (optical device) to be in contact with a peripheral portion and at an adjacent portion of the optical LPF  25  and which comes into closely contact with a dust-proofing filter supporting member  23 H comprising a part of a sealing structure, which will be described later, at a predetermined portion; the dust-proofing filter supporting member  23 H which is abutted on the dust-proofing filter  21  (dust-proofing member) arranged in the front of the CCD case  24  at a peripheral portion and an adjacent portion thereof and supports it; the dust-proofing filter  21  as an optical member and a dust-proofing member, opposed and arranged at a predetermined position having a predetermined interval to the optical LPF  25  in the front of the optical LPF  25  on the side of the photoelectrically converting surface of the image pick-up device  27 , which is supported by the dust-proofing filter supporting member  23 H; the piezoelectric element  22  arranged to the surface on the opposed side of the image pick-up device  27  at a peripheral portion of the dust-proofing filter  21 , as a member for vibration for applying a predetermined vibration to the dust-proofing filter  21 , comprising an electromechanical transducer such as piezoelectric ceramics; a plate-shaped pressing member  20 B comprising an elastic member which joints the dust-proofing filter  21  to the dust-proofing filter supporting member  23  airtightly, and the like. 
     The image pick-up device  27  obtains the image signal corresponding to the subject image formed onto the photoelectrically converting surface thereof by receiving the subject beams transmitted through the photographing optical system  12   a  onto the photoelectrically converting surface thereof and by performing photoelectrically converting processing, and corresponds to, e.g., a charge coupled device (CCD). 
     The image pick-up device  27  is mounted at a predetermined position on the main circuit board  16  via the image pick-up device fixing plate  28  interposed. As mentioned above, the image signal processing circuit  16   a  and the work memory  16   b , etc. are mounted on the main circuit board  16  so that an output signal from the image pick-up device  27 , that is, the image signal obtained by the photoelectrically converting processing is transmitted to the image signal processing circuit  16   a  or the like. 
     As the signal processing in the image signal processing circuit  16   a , the photographing optical system  12   a  held in the lens barrel  12  loaded to the photographing optical system mounting unit  11   a  converts the image signal obtained from the image pick-up device  27  to a signal matching the recording, corresponding to the image formed onto the photoelectrically converting surface of the image pick-up device  27 . The above-mentioned signal processing is the same as processing for treating the digital image signal, usually performed in the general digital cameras. Therefore, a detailed description of various signal processing executed in the camera  1  is omitted. 
     The optical LPF  25  is arranged in front of the image pick-up device  27  while sandwiching the low-pass filter supporting member  26 . The CCD case  24  is arranged to cover the optical LPF  25 . 
     That is, an opening  24   c  which is rectangular substantially in the center is provided for the CCD case  24 . The optical LPF  25  and the image pick-up device  27  are arranged from the back side at the opening  24   c . The step portion  24   a  whose cross section is almost L-shaped is formed at an inner peripheral portion of the back side of the opening  24   c  (refer back to  FIGS. 4 and 5 ). 
     As mentioned above, the low-pass filter supporting member  26  made of an elastic member or the like is arranged between the optical LPF  25  and the image pick-up device  27 . In the peripheral portion in front of the image pick-up device  27 , the low-pass filter supporting member  26  is arranged within a valid range of the photoelectrically converting surface, in other words, at a position for evacuating valid beams incident on the image pick-up device  27 , and is abutted on an adjacent portion of the peripheral portion at the back of the optical LPF  25 . The airtightness is substantially held between the optical LPF  25  and the image pick-up device  27 . Thus, elastic force acts to the optical LPF  25  in the optical axis direction by the low-pass filter supporting member  26 . 
     Then, the peripheral portion in front of the optical LPF  25  is airtightly abutted on the step portion  24   a  of the CCD case  24 . Thus, the position of the optical LPF  25  in the optical axis direction is regulated against the elastic force generated by the low-pass filter supporting member  26 , which tends to displace the optical LPF  25  to the optical axis direction. 
     In other words, the optical LPF  25  inserted from the back side in the opening  24   c  of the CCD case  24  is subjected to the position regulation in the optical direction by using the step portion  24   a . Consequently, it is possible to prevent the optical LPF  25  from breaking away from the inside of the CCD case  24  towards the front side. 
     As mentioned above, after inserting the optical LPF  25  in the opening  24   c  of the CCD case  24  from the back side, the image pick-up device  27  is arranged at the back side of the optical LPF  25 . In this case, the low-pass filter supporting member  26  is sandwiched between the optical LPF  25  and the image pick-up device  27  in the peripheral portion of the low-pass filter supporting member  26 . 
     As mentioned above, the image pick-up device  27  is mounted on the main circuit board  16  while sandwiching the image pick-up device fixing plate  28 . The image pick-up device fixing plate  28  is fixed to the screw holes  24   e  from the back of the CCD case  24  via the spacer  28   a  interposed by the screw  28   b . The main circuit board  16  is fixed to the image pick-up device fixing plate  28  via the spacer  16   c  by the screw  16   d  interposed. 
     In front of the CCD case  24 , the dust-proofing supporting member  23 H is fixed to the screw holes  24   b  of the CCD case  24  by the screw  23   b . In this case, the circumferential groove  24   d  is formed with a substantially annular shape at the predetermined position in front of the CCD case  24  in the peripheral side thereof. On the other hand, at the predetermined position at the back and the peripheral side of the dust-proofing filter supporting member  23 H, the annular convex portion  23   d  (not shown in  FIG. 72 , refer to  FIG. 73 , and further refer back to  FIGS. 4  and  5  according to the first embodiment) corresponding to the circumferential groove  24   d  of the CCD  24  is substantially annularly formed throughout the circumference. By fitting the annular convex portion  23   d  to the circumferential groove  24   d , the CCD case  24  is fit to the dust-proofing filter supporting member  23 H airtightly in an annular area, that is, in an area in which the circumferential groove  24   d  and the annular convex portion  24   d  are formed. 
     The dust-proofing filter  21  is circular or polygonal plate-shaped as a whole, and forms a transparent portion as at least an area having a predetermined spread in a radial direction from the center of the dust-proofing filter  21 . The transparent portion is opposed and arranged in front of the optical LPF  25  at a predetermined interval. 
     At the peripheral portion of one surface (back surface according to the twenty-sixth embodiment) of the dust-proofing filter  21 , the piezoelectric element  22  annularly formed by the electromechanical transducer, as a predetermined member for vibration for applying the vibrations to the dust-proofing filter  21 , is integrally arranged by means of adhesion using an adhesive. The piezoelectric element  22  generates predetermined vibrations in the dust-proofing filter  21  by applying a predetermined driving voltage from the outside. 
     The dust-proofing filter  21  is fixed and held by the pressing member  20 B made of the elastic member such as a plate-shaped spring so as to be airtightly jointed to the dust-proofing filter supporting member  23 H. 
     The circular or polygonal opening  23   f  is pierced almost near the center of the dust-proofing filter supporting member  23 H. The opening  23   f  has a size enough to transmit the subject beams which are transmitted through the photographing optical system  12   a  and to irradiate with the beams the photoelectrically converting surface of the image pick-up device  27  arranged at the back. 
     The wall portion  23   e  projecting in front is formed at a peripheral portion of the opening  23   f . Further, the supporting portion  23   c  is formed so that it projects towards the front side at the edge of the wall portion  23   e.    
     A plurality of projecting portions  23 Ha and a plurality of pressing member fixing portions  23 Hg (three projecting portions and three pressing member fixing portions according to the twenty-sixth embodiment) are formed, projecting toward the front side, near an outer peripheral portion in front of the dust-proofing filter supporting member  23 H. 
     The projecting portions  23 Ha function as position regulating members for positioning the dust-proofing filter  21  to the dust-proofing filter supporting member  23 H to arrange the dust-proofing filter  21 . 
     The pressing member fixing portions  23 Hg are portions formed to fix the pressing member  20 B for fixing and holding the dust-proofing filter  21  by the screw as shown in  FIG. 73 . The pressing member  20 B is fixed by fastening means such as the fixing screw  20   a  to the screw hole formed to the pressing member fixing portion  23 Hg. 
       FIG. 73  is a main-part enlarged sectional perspective view showing an enlarged adjacent portion of the pressing member fixing portion  23 Hg used for fixing and holding a part of the image pick-up device unit  15 Q, that is, the dust-proofing filter  21  and the pressing member  20 B to the dust-proofing filter supporting member  23 H. 
     As mentioned above, the pressing member  20 B is made of the elastic member such as the plate-shaped spring and is circularly formed. A plurality of (three, according to the twenty-sixth embodiment) convex pieces  20 Bb are projected toward the outside at the peripheral portion of the pressing member  20 B. Piercing holes are set to the convex pieces  20 Bb through which the fixing screw  20   a  penetrates. 
     The dust-proofing filter  21  is arranged at a predetermined position of the dust-proofing filter supporting member  23 H. Then, the pressing member  20 B is fixed by using the screw. In this case, the dust-proofing filter  21  is easily arranged at the predetermined position of the dust-proofing filter supporting member  23 H by moving the peripheral portion of the dust-proofing filter  21  in the optical direction along the projecting portion  23 Ha. 
     The supporting portion  23   c  is abutted on the predetermined position (portion as a node upon vibration) of the dust-proofing filter  21  (actually, the piezoelectric element  22 ). 
     In this status, by overlapping and arranging the pressing member  20 B to the dust-proofing filter  21 , the dust-proofing filter  21  is sandwiched between the pressing member  20 B and the dust-proofing filter supporting member  23 H. In this case, the pressing member  20 B is fixed to the screw holes of the pressing member fixing portions  23 Hg by the fixing screws  20   a . Then, a plain circular-shaped portion of the pressing member  20 B is abutted on a predetermined portion of the peripheral portion of the dust-proofing filter  21 , thereby pressing the dust-proofing filter  21  toward the side of the dust-proofing filter supporting member  23 H by the elastic force of the pressing member  20 B. 
     In this case, by making the predetermined portion of the piezoelectric element  22  arranged at the peripheral portion at the back of the dust-proofing filter  21  abut on the supporting portion  23   c , the positions of the dust-proofing filter  21  and the piezoelectric element  22  are regulated in the optical axis direction. Therefore, the dust-proofing filler  21  is fixed and held to airtightly be jointed to the dust-proofing filter supporting member  23 H via the piezoelectric element  22  interposed. 
     In other words, the dust-proofing filter supporting member  23 H is airtightly jointed to the dust-proofing filter  21  via the piezoelectric element  22  interposed by the elastic force caused by the pressing member  20 B. 
     As mentioned above, the holding structure for pressing the peripheral portion of the dust-proofing filter  21  to press and fix the dust-proofing filter  21  (dust-proofing member) to the dust-proofing filter supporting member  23 H (sealing structure) comprises the pressing member  20 B, the projecting portions  23 Hg of the dust-proofing filter supporting member  23 H, and the like. 
     Between the dust-proofing filter supporting member  23 H and the CCD case  24 , the circumferential groove  24   d  is airtightly fit to the annular convex portion  23   d . Further, the dust-proofing filter supporting member  23 H is airtightly jointed to the dust-proofing filter  21  via the piezoelectric element  22  interposed by the pressing force of the pressing member  20 B. 
     The optical LPF  25  arranged to the CCD case  24  becomes airtight between the peripheral portion in front of the optical LPF  25  and the step portion  24   a  of the CCD case  24 . 
     Further, the image pick-up device  27  is arranged at the back of the optical LPF  25  via the low-pass filter supporting member  26  interposed. Between the optical LPF  25  and the image pick-up device  27 , the airtightness is substantially held. 
     Therefore, with the foregoing structure, in the space formed by opposing the optical LPF  25  and the dust-proofing filter  21 , a predetermined air gap portion is formed. A space portion is formed on the peripheral side of the optical LPF  25 , that is, by the CCD case  24 , the dust-proofing filter supporting member  23 H, and the dust-proofing filter  21 . The space portion is a sealed space formed, projecting toward the outside of the optical LPF  25 . 
     In this case, the space portion is set to be wider than the air gap portion. A space containing the air gap portion and the space portion becomes a sealing space which is substantially airtightly sealed by the CCD case  24 , the dust-proofing filter supporting member  23 H, the dust-proofing filter  21 , and the optical LPF  25  as mentioned above. 
     As described above, the image pick-up device unit  15 Q in the camera according to the twenty-sixth embodiment comprises the sealing structure for forming the sealing space which is substantially sealed and is formed at the peripheral portion of the optical LPF  25  and the dust-proofing filter  21 , including the air gap portion. The sealing structure is arranged at the outside position from the optical LPF  25  to the adjacent portion thereof. 
     In addition, according to the twenty-sixth embodiment, the sealing structure comprises the dust-proofing filter supporting member  23 H for supporting the dust-proofing filter  21  in contact with the peripheral portion or the adjacent portion thereof, the CCD case  24  arranged for supporting the optical LPF  25  in contact with the peripheral portion or the adjacent portion thereof and for coming into contact with the dust-proofing filter supporting member  23 H at its predetermined portion, and the like. 
     According to the twenty-sixth embodiment, with the foregoing structure, the dust-proofing filter  21  is opposed at the predetermined position to the front of the image pick-up device  27  and the sealing space for sealing a space formed at the photoelectrically converting surface of the image pick-up device  27  and at the peripheral portion of the dust-proofing filter  21  is formed. Thus, the adhesion of dust to the photoelectrically converting surface of the image pick-up device  27  is prevented. 
     Dusts adhered to the exposing surface in front of the dust-proofing filter  21  is removed by applying a periodic voltage to the piezoelectric element  22  arranged integrally with the peripheral portion of the dust-proofing filter  21  and by applying a predetermined vibration to the dust-proofing filter  21 . 
     The soft member  62  used for the image pick-up device unit  15 P according to the twenty-fifth embodiment is removed according to the twenty-sixth embodiment. 
     According to the twenty-sixth embodiment, the dust-proofing filter supporting member  23 H as the sealing structure is airtightly jointed, fixed, and held to the dust-proofing filter  21  as the dust-proofing member arranged in front of the image pick-up device  27  by pressing the dust-proofing filter  21  to the dust-proofing filter supporting member  23 H by using the elastic force of the pressing member  20 B. 
     In this case, the plate-shaped pressing member  20 B is formed with a circular shape. Therefore, the pressing member  20 B uniformly presses the predetermined position near the peripheral portion of the dust-proofing filter  21 . Thus, the dust-proofing filter  21  is stably and accurately fixed and held. 
     The pressing member  20 B is formed with a simple shape and therefore the structure of the holding structure is simplified. Corresponding thereto, advantageously, the members are easily manufactured and the assembling process of the image pick-up device unit  15 Q is simplified. 
     According to the twenty-sixth embodiment, the pressing member  20 B made of the elastic member such as the plate-shaped spring, with the circular shape, is used as the member of the holding structure for airtightly jointing, fixing, and holding the dust-proofing filter  21  to the dust-proofing filter supporting member  23 H by pressing the dust-proofing filter  21  thereto. In this case, the dust-proofing filter  21  is pressed within a predetermined range of a plate-shaped surface of the pressing member  20 B. 
     However, the pressing member  20 B is not limited to the above-description and may use different pressing member. Then, an example different from that according to the twenty-sixth embodiment is illustrated hereinafter. 
     The structure according to the twenty-seventh and twenty-eighth, basically, the structures are the same as that according to the twenty-sixth embodiment. Therefore, the same members are designated by the same reference numerals and are not described. Only different portions are described in detail. 
     First, a description is given of an image pick-up device unit according to the twenty-seventh embodiment of the present invention. 
       FIGS. 74 and 75  are diagrams showing the twenty-seventh embodiment of the present invention.  FIG. 74  is a main-part exploded perspective view showing the disassembled image pick-up device unit.  FIG. 75  is a main-part enlarged sectional perspective view showing an enlarged part of the image pick-up device unit, namely showing the cross section and an enlarged attaching portion of the dust-proofing member and the pressing member. 
     According to the twenty-seventh embodiment, a pressing member  20 C has a plurality of (three, according to the present embodiment) convex portions  20 Cd on the surface onto which the dust-proofing filter  21  should be abutted. When the pressing member  20 C is attached to an image pick-up device unit  15 R, the convex portions  20 Cd are arranged projecting toward the dust-proofing filter  21  by press working, etc. 
     Similarly to the case according to the twenty-sixth embodiment, the pressing member  20 C is fixed to screw holes of the pressing member fixing portion  23 Gg of the dust-proofing filter supporting member  23 G via the dust-proofing filter  21  interposed by the fixing screws  20   a . Thus, the edge portions of the convex portions  20 Cd of the pressing member  20 C are abutted onto the predetermined positions of the peripheral portion of the dust-proofing filter  21 , thereby pressing the dust-proofing filter  21 . Therefore, the pressing member  20 C presses the peripheral portion of the dust-proofing filter  21  with point contact at the plurality of convex portions  20 Cd. 
     According to the twenty-sixth embodiment, the projecting portion  23 Ha is arranged to the dust-proofing filter supporting member  23 H and, thus, the dust-proofing filter supporting member  23 H functions as a position regulating member for positioning the dust-proofing filter  21  upon arranging the dust-proofing filter  21 . However, this is omitted in the dust-proofing filter supporting member  23 G according to the twenty-seventh embodiment. 
     That is, according to the twenty-seventh embodiment, the pressing member fixing portion  23 Gg formed to fix the pressing member  20 C for fixing and holding the dust-proofing filter  21  by the screw functions as the position regulating member of the dust-proofing filter  21 . 
     Other structure is the same as that according to the twenty-sixth embodiment. 
     According to the twenty-seventh embodiment, the structure of the dust-proofing filter supporting member  23 G is the same as that of the dust-proofing filter supporting member  23 G according to the twenty-fifth embodiment and therefore is designated by the same reference numeral (refer to  FIG. 70 ). 
     As mentioned above, according to the twenty-seventh embodiment, the convex portion  20 Cd is arranged to the pressing member  20 C, thereby pressing the dust-proofing filter  21  with point contact. 
     According to the twenty-seventh embodiment, the same advantages as those according to the sixth embodiment are obtained. In addition, as compared with the structure in which the peripheral portion of the dust-proofing filter  21  is pressed by the plain surface according to the twenty-sixth embodiment, the peripheral portion of the dust-proofing filter  21  is pressed with the point contact, thereby preventing the obstruction of the pressing member  20 C against the vibrations of the dust-proofing filter  21  and obtaining the stable vibrations of the dust-proofing filter  21 . 
     Next, a description is given of an image pick-up device unit according to the twenty-eighth embodiment of the present invention. 
       FIGS. 76 and 77  are diagrams showing the twenty-eighth embodiment of the present invention.  FIG. 76  is a main-part exploded perspective view showing the disassembled image pick-up device unit.  FIG. 77  is a main-part enlarged sectional perspective view showing an enlarged part of the image pick-up device unit, namely showing the cross section and an enlarged attaching portion of the dust-proofing member and the pressing member. 
     According to the twenty-eighth embodiment, a pressing member  20 D has a convex groove  20 De which should be abutted onto the dust-proofing filter  21  in the circumferential direction thereof. When the pressing member  20 D is attached to an image pick-up device unit  15 S, the convex groove  20 De is arranged projecting toward the dust-proofing filter  21  by press working, etc. 
     Similarly to the case according to the twenty-seventh embodiment, the pressing member  20 D is fixed to the screw hole of the pressing member fixing portion  23 Gg of the dust-proofing filter supporting member  23 G via the dust-proofing filter  21  interposed by the fixing screw  20   a . Thus, the edge portion of the convex groove  20 De of the pressing member  20 D is abutted to the predetermined portion of the peripheral portion of the dust-proofing filter  21 , thereby pressing the dust-proofing filter  21 . Therefore, the pressing member  20 D presses a predetermined portion at the peripheral portion of the dust-proofing filter  21  with line contact by the convex groove  20 De. 
     According to the twenty-eighth embodiment, the dust-proofing filter supporting member  23 G is used similarly to the case according to the twenty-seventh embodiment. That is, the dust-proofing filter supporting member  23 G obtained by omitting the projecting portion  23 Ha according to the twenty-sixth embodiment from the dust-proofing filter supporting member  23 Ha is used. The pressing member fixing portion  23 Gg controls the position of the dust-proofing filter  21 . 
     Other structure is the same as that according to the twenty-sixth or the twenty-seventh embodiment. 
     As mentioned above, according to the twenty-eighth embodiment, the convex groove  20 De is arranged to the pressing member  20 D, thereby pressing the dust-proofing filter with line contact. 
     Therefore, according to the twenty-eighth embodiment, the same advantages as those according to the twenty-sixth embodiment are obtained. In addition, as compared with the structure in which the peripheral portion of the dust-proofing filter  21  is pressed by the plain surface according to the twenty-sixth embodiment, the peripheral portion of the dust-proofing filter  21  is pressed with the line contact, thereby preventing the obstruction of the pressing member  20 D against the vibration of the dust-proofing filter  21  and obtaining the stable vibration of the dust-proofing filter  21 . 
     According to the twenty-sixth to twenty-eighth embodiments, so-called screw-fastening type fixing means using the fixing screw  20   a  is used as the means for fixing the pressing member ( 20 B,  20 C, or  20 D) to the dust-proofing filter supporting member ( 23 G or  23 H). 
     However, the fixing means of the pressing member is not limited to the foregoing. The pressing member may be fixed and held to the dust-proofing filter supporting member via the dust-proofing filter  21  interposed. 
     Then, a description is given of an example using fixing means of the pressing member different from the screw-fastening type one according to the twenty-sixth to twenty-eighth embodiments. 
     The structure according to the twenty-ninth to thirty-first embodiments is basically the same as that according to the twenty-sixth embodiment. Therefore, the same components are not described and are designated by the same reference numerals. Only different portions are described in detail. 
     First, according to the twenty-ninth embodiment, an image pick-up device unit will be described. 
       FIGS. 78 to 82  are diagrams according to the twenty-ninth embodiment of the present invention.  FIG. 78  is a main-part exploded perspective view showing the disassembled image pick-up device unit.  FIG. 79  is a perspective view showing the assembled image pick-up device unit.  FIG. 80  is a sectional view along a line  80 - 80  shown in  FIG. 79 .  FIG. 81  is a perspective view showing a state of assembling the pressing member to the image pick-up device unit.  FIG. 82  is a main-part enlarged sectional perspective view showing the cross section of an enlarged part of the image pick-up device, namely showing the dust-proofing member and an attaching portion of the pressing member. 
     According to the twenty-ninth embodiment, means for fixing a pressing member  20 E in an image pick-up device unit  15 T to a dust-proofing filter supporting member  23 J is so-called fitting type fixing means using no screw. Thus, the pressing member  20 E made of an elastic member such as a plate-shaped spring, with a circular shape, has a plurality of (three, according to the twenty-ninth embodiment) convex pieces  20 Eb toward the outside at the peripheral portion thereof. Substantially semi-circular-shaped notches are formed at the edges of the convex pieces  20 Eb. 
     On the other hand, according to the twenty-ninth embodiment, in place of the pressing member fixing portion  23 Hg according to the twenty-sixth embodiment, a pressing member fixing portion  23 Jh functioning as the pressing member fixing portion  23 Hg is formed to the dust-proofing filter supporting member  23 J. The pressing member fixing portion  23 Jh has the same function as that of the projecting portion  23 Ha according to the twenty-sixth embodiment, that is, has one function for regulating the position of the dust-proofing filter  21  and another function for fixing and holding the pressing member  20 E. Therefore, according to the twenty-ninth embodiment, similarly to the cases according to the twenty-seventh and twenty-eighth embodiments, the projecting portion  23 Ha according to the twenty-sixth embodiment is omitted. 
     A fitting convex portion  23 Ji having a circumferential groove  23 Jj (refer to  FIG. 80 ) at the base portion is projected at the edge portion of the pressing member fixing portion  23 Jh so as to fit a convex piece  20 Eb of the pressing member  20 E. 
     Thus, the semi-circular notch portions formed to the plurality of convex pieces  20 Eb of the pressing member  20 E are fit to the circumferential grooves  23 Jj of the fitting convex portions  23 Ji provided for a plurality of pressing member fixing portions  23 Jh, thereby attaching the pressing member  20 E to the dust-proofing filter supporting member  23 J via the dust-proofing filter  21  interposed. 
     In a status in which the pressing member  20 E is attached to the dust-proofing filter supporting member  23 J, a circular-shaped plate portion of the pressing member  20 E is abutted on a predetermined position of the peripheral portion of the dust-proofing filter  21  and presses the dust-proofing filter  21  toward the side of the dust-proofing filter supporting member  23 J by the elastic force thereof. 
     The pressing member  20 E is fit to the circumferential groove  23 Jj of the fitting convex portion  23 Ji arranged to the pressing member fixing portion  23 Hj of the dust-proofing filter supporting member  23 J by the following sequence. 
     That is, referring to  FIG. 81 , the pressing member  20 E is bent with a convex shape in a predetermined direction against the elastic force thereof, namely, toward the outside from the front surface of the image pick-up device unit  15 T. In this state, the plurality of convex pieces  20 Eb of the pressing member  20 E are arranged at positions for being fit to the circumferential grooves  23 Jj of the fitting convex portions  23 Ji. By releasing the force amount against the elastic force applied to the pressing member  20 E in this state, the pressing member  20 E is restored to a predetermined form by the elastic force thereof and the notch portions of the convex pieces  20 Eb are fit to the circumferential grooves  23 Jj of the fitting convex portions  23 Ji. 
     Other structure is the same as that according to the twenty-sixth embodiment. 
     With the above-described structure, the same advantages as those according to the twenty-sixth embodiment are obtained. In addition, according to twenty-ninth embodiment, the pressing member  20 E is the fitting-type fixing means and therefore the assembling process is simplified upon fixing the pressing member  20 E at the predetermined position of the dust-proofing filter supporting member  23 J. As compared with the screw-fastening type fixing means, working for attaching the pressing member  20 E is simplified. Thus, the manufacturing process is made efficient and the productivity is improved. Further, this contributes to the reduction in manufacturing costs. 
     According to the twenty-ninth embodiment, the fitting type pressing member can easily be pressed at the peripheral portion of the dust-proofing filter  21  with point contact or with line contact similarly to the twenty-seventh and the twenty-eighth embodiments. An example of this structure will be described according to the thirtieth embodiment (refer to  FIG. 83 ) and the thirty-first embodiment (refer to  FIG. 84 ) of the present invention. 
       FIG. 83  is a main-part enlarged sectional perspective view showing a cross section of an enlarged part of an image pick-up device unit according to thirtieth embodiment of the present invention, namely showing an attaching portion of the dust-proofing member and the pressing member. 
     According to the thirtieth embodiment, similarly to the case according to the twenty-seventh embodiment (refer to  FIGS. 74 and 75 ), a pressing member  20 F in the image pick-up device unit has a plurality of (three, in the present embodiment) convex portions  20 Fd on the surface to be abutted on the dust-proofing filter  21 . The convex portions  20 Fd are formed similarly to the convex portions  20 Cd of the pressing member  20 C according to the twenty-seventh embodiment. 
     Similarly to the case according to the twenty-ninth embodiment, a convex piece  20 Fb of the pressing member  20 F is fit to the circumferential groove  23 Jj of the fitting convex portion  23 Ji of the pressing member fixing portion  23 Jh of the dust-proofing filter supporting member  23 J. Thus, the pressing member  20 F is jointed to the dust-proofing filter supporting member  23 J via the dust-proofing filter  21  interposed. As a result of the jointing, edge portions of a plurality of convex portions  20 Fd of the pressing member  20 F come into contact predetermined portions at the peripheral portion of the dust-proofing filter  21 , thus to press the contact portions. Therefore, the pressing member  20 F presses the peripheral portions of the dust-proofing filter  21  at a plurality of convex portions  20 Fd with point contact. 
     According to the thirtieth embodiment, the projecting portion  23 Ha of the dust-proofing filter supporting member  23 H according to the twenty-sixth embodiment is omitted. A pressing member fixing portion  23 Hh formed for fitting and fixing the pressing member  20 F, which fixes and holds the dust-proofing filter  21 , functions as the position regulating member of the dust-proofing filter  21 . 
     Other structure is the same as that according to the twenty-sixth embodiment. 
     According to the thirtieth embodiment, with the above-described structure, the pressing member  20 F is a fitting type member and the convex portions  20 Fd are formed to the pressing member  20 F, thereby pressing the dust-proofing filter  21  with point contact. 
     Consequently, according to the thirtieth embodiment, the same advantages as those according to the twenty-ninth embodiment are obtained. In addition, according to the thirtieth embodiment, the peripheral portions of the dust-proofing filter  21  are pressed with the point contact. As compared with the structure in which the peripheral portion of the dust-proofing filter  21  is pressed with the plain surface according to the twenty-ninth embodiment, the obstruction of the pressing member  20 F against the vibrations of the dust-proofing filter  21  is suppressed and the vibrations of the dust-proofing filter  21  are stably obtained. 
       FIG. 84  is a main-part enlarged sectional perspective view showing a cross section of an enlarged part of an image pick-up device unit according to thirty-first embodiment of the present invention, namely showing an attaching portion of the dust-proofing member and the pressing member. 
     According to the thirty-first embodiment, similarly to the case according to the twenty-eighth embodiment (refer to  FIGS. 76 and 77 ), a pressing member  20 G in the image pick-up device unit has a circular-shaped convex groove  20 Ge along the circumferential direction on the surface which should be abutted on the dust-proofing filter  21 . The convex groove  20 Ge is formed substantially similarly to the convex groove  20 De of the pressing member  20 D according to the twenty-eighth embodiment. 
     Similarly to the twenty-eighth embodiment, the convex piece  20 Gb of the pressing member  20 G is fit to the circumferential groove  23 Jj of the fitting convex portion  23 Ji of the pressing member fixing portion  23 Jh in the dust-proofing filter supporting member  23 J. Thus, the pressing member  20 G is jointed to the dust-proofing filter supporting member  23 J via the dust-proofing filter  21  interposed. As a result of the jointing, edge portions of the convex groove  20 Ge of the pressing member  20 G are abutted onto predetermined portions at the peripheral portion of the dust-proofing filter  21 , thus to press the contact portions. Therefore, the pressing member  20 G presses the peripheral portion of the dust-proofing filter  21  at the convex groove  20 Ge with line contact. 
     According to the thirty-first embodiment, the projecting portion  23 Ha of the dust-proofing filter supporting member  23 H according to the twenty-sixth embodiment is omitted. The pressing member fixing portion  23 Jh formed for fitting and fixing the pressing member  20 G for fixing and holding the dust-proofing filter  21  functions as the position regulating member of the dust-proofing filter  21 . 
     Other structure is the same as that according to the twenty-sixth embodiment. 
     According to the thirty-first embodiment, with the above-described structure, the convex groove  20 Ge is formed to the pressing member  20 G, thereby pressing the dust-proofing filter  21  with line contact. 
     Consequently, according to the thirty-first embodiment, the same advantages as those according to the twenty-ninth embodiment are obtained. In addition, according to the thirty-first embodiment, the peripheral portion of the dust-proofing filter  21  is pressed with line contact. As compared with the structure in which the peripheral portion of the dust-proofing filter  21  is pressed with the plain surface according to the twenty-ninth embodiment, the obstruction of the pressing member  20 G against the vibrations of the dust-proofing filter  21  is suppressed and the vibrations of the dust-proofing filter  21  are stably obtained. 
     The twenty-sixth to thirty-first embodiments use the example of applying the elastic member such as the plate-shaped spring with a circular shape, as the pressing member for pressing the dust-proofing filter  21  in the predetermined direction and for airtightly jointing, fixing, and holding the dust-proofing filter  21  to the dust-proofing filter supporting member  23 . However, the shape of the pressing member is not limited to be circular and may be formed with another shape. Then, a description is given of another example of the shape of the pressing member in an image pick-up device unit. 
     First, an image pick-up device unit will be described hereinbelow according to the thirty-second embodiment of the present invention. 
     According to the thirty-second embodiment, basically, the structure is the same as that according to the first embodiment. According to the thirty-second embodiment, only shapes of the dust-proofing filter supporting member forming a part of the sealing structure and the pressing member for jointing, for fixing and holding, the dust-proofing filter (dust-proofing member) to the dust-proofing filter supporting member are different from those according to the first embodiment. Therefore, the same structure as that according to the first embodiment is described by using the same reference numeral. The structure of the entire camera is referred to  FIGS. 1 and 2  used for the description of the first embodiment. 
     According to the thirty-second embodiment, with respect to the image pick-up device unit in the camera, mainly, the structures of the dust-proofing filter supporting member  23  and the pressing member  20  for fixing and holding the dust-proofing filter supporting member  23  are described in detail with reference to  FIGS. 3 and 5  used for the description of the first embodiment. 
     Similarly to the image pick-up device units according to the above embodiments, in the image pick-up device unit  15  according to the thirty-second embodiment, the dust-proofing filter  21  is fixed and held to the dust-proofing filter supporting member  23  by a plurality of pressing members  20  made of the elastic member such as the plate-shaped spring to the dust-proofing filter supporting member  23 . Thus, the dust-proofing filter  21  is airtightly jointed to the dust-proofing filter supporting member  23 . 
     A plurality of (three, according to the thirty-second embodiment) projecting portions  23   a  as the pressing member fixing portions are projected toward the front side of the image pick-up device unit  15  at the predetermined position near the outer peripheral portion in front of the dust-proofing filer supporting member  23 . The projecting portions  23   a  are formed for fixing the pressing member  20  which fixes and holds the dust-proofing filter  21 . The pressing member  20  is fixed to edge portions of the projecting portions  23   a  by the fixing screw  20   a  as predetermined fastening means. 
     The pressing member  20  is made of an elastic member such as a plate-shaped spring, and is fixed to the projecting portion  23   a  at the base end portion thereof. A free end portion of the pressing member  20  is abutted onto an outer peripheral portion of the dust-proofing filter  21 , thereby pressing the dust-proofing filter  21  to the side of the dust-proofing filter supporting member  23 , that is, toward the optical axis direction. 
     A convex portion  20   d  similar to the convex portion  20 Cd of the pressing member  20 C according to the twenty-seventh embodiment is formed near the edge portion of the pressing member  20  (refer to  FIGS. 4 and 5 ). 
     That is, according to the thirty-second embodiment, convex portions  20   d  are formed to the surface on which a plurality of pressing members  20  should be abutted on the dust-proofing filter  21 . Upon attaching the pressing members  20  to the image pick-up device unit  15 , the convex portion  20   d  is formed by, e.g., press working, projecting toward the dust-proofing filter  21 . The formation of the convex portion  20   d  to the pressing member  20  presses the dust-proofing filter  21  with point contact according to the thirty-second embodiment. 
     With the above-mentioned structure, in the image pick-up device unit  15 , dust and the like adhered to the exposing surface in front of the dust-proofing filter  21  are removed by applying a periodic voltage to the piezoelectric element  22  arranged integrally with the peripheral portion of the dust-proofing filter  21  and by thus applying predetermined vibrations to the dust-proofing filter  21 . 
     The same operations as those according to the first embodiment are obtained upon removing dust and the like adhered to the dust-proofing filter  21  by applying the periodic voltage to the piezoelectric element  22  and by thus applying the predetermined vibrations to the dust-proofing filter  21  (refer to  FIGS. 6 to 11 ) As mentioned above, according to the thirty-second embodiment, the same advantages as those according to the first embodiment are obtained. 
     Further, according to the thirty-second embodiment, the holding structure for pressing and fixing the dust-proofing filter  21  (dust-proofing member) to the dust-proofing filter supporting member  23  (sealing structure) comprises a plurality of pressing members  20 , thus to press a plurality of portions of the peripheral portion of the dust-proofing filter  21 . 
     In other words, the number of pressing portions of the dust-proofing filter  21  using the pressing member  20  are limited to a plural number. Upon vibrating the dust-proofing filter  21  by the operation of the piezoelectric element  22 , as compared with the case of applying the pressing member comprising one member with a circular shape according to the twenty-sixth to thirty-first embodiments, the dust-proofing filter  21  is pressed toward the dust-proofing filter supporting member  23  in an accurate and stable state without the obstruction against the vibrations of the dust-proofing filter  21 . 
     According to the thirty-second embodiment, a plurality of pressing members  20  are made of the elastic member such as the plate-shaped spring, and the convex portion  20   d  is formed to the surface thereof which is abutted onto the dust-proofing filter  21 . 
     On the other hand, the convex portion  20   d  may be not formed to the plurality of pressing members  20 . The plurality of pressing members  20  may use plain-shaped pressing members (similar to that according to the twenty-sixth embodiment). In place of the convex portion  20   d , the plurality of pressing members  20  may use the pressing member having convex grooves (similar to that according to the twenty-eighth embodiment). 
     According to the thirty-second embodiment, the screw-fastening type fixing means using the fixing screw  20   a  is used as the means for fixing the plurality of pressing members  20  to the dust-proofing filter supporting member. However, another fixing means is considered. Hereinbelow, a description is given of a pressing member different from that according to the thirty-second embodiment. 
     According to the thirty-third to thirty-ninth embodiments, basically, the structure is the same as that according to the thirty-second embodiment. Therefore, the same components are designated by the same reference numerals and are not described. Only different portions are described in detail. 
     Hereinbelow, a description is given of an image pick-up device unit according to the thirty-third embodiment. 
       FIGS. 85 to 88  show the thirty-third embodiment of the present invention.  FIG. 85  is a perspective view schematically showing the image pick-up device unit according to the thirty-third embodiment.  FIG. 86  is a main-part enlarged exploded perspective view showing enlarged parts of the pressing member and the pressing member fixing portion.  FIGS. 87 and 88  are operational diagrams showing the sequence of attaching and fixing the pressing member to the pressing member fixing portion. 
     Referring to  FIGS. 85 and 86 , according to the thirty-third embodiment, a pressing member  20 H has a convex portion  20 Hd on the surface on which it should be abutted onto the dust-proofing filter  21 . Upon attaching the pressing member  20 H to an image pick-up device unit  15 U, the convex portion  20 Hd is formed by, e.g., press working, projecting toward the dust-proofing filter  21 . A pear-shaped piercing hole  20 Hc which is formed by connecting a large-diameter portion and a small-diameter portion and a notch portion  20 Hf are formed at predetermined positions in a proximal end portion  20 Hb of the pressing member  20 H. 
     On the contrary, a plurality of (three, in the present embodiment) pressing member fixing portions  23 Ka are formed, projecting toward the front side of a dust-proofing filter supporting member  23 K, at predetermined positions near the outer peripheral portion in front of a dust-proofing filter supporting member  23 K forming a part of the sealing structure of the image pick-up device unit  15 U. The pressing member fixing portion  23 Ka is formed for fixing a plurality of pressing members  20 H which fixes and holds the dust-proofing filter  21 . 
     Therefore, the pressing member fixing portion  23 Ka has, onto the edge portion thereof, a fitting convex portion  23 Ki having a circumferential groove  23 Kj (refer to  FIG. 86 ) for fitting the piercing hole  20 Hc of the pressing member  20 H at the base portion thereof and a projecting portion  23 Kk engaged to the notch portion  20 Hf of the pressing member  20 H, for positioning the notch portion  20 Hf. 
     Other structure is the same as that according to the thirty-second embodiment. 
     With the above-described structure, upon attaching the pressing member  20 H to the pressing member fixing portion  23 Ka of the dust-proofing filter supporting member  23 K, the fitting convex portion  23 Ki of the pressing member fixing portion  23 Ka is fit to the large-diameter portion of the piercing hole Hc of the pressing member  20 H, thereby entering a status shown in  FIG. 87 . 
     In this status, the pressing member  20 H is slid in the direction shown by an arrow H in  FIG. 87 . Then, the small-diameter portion of the piecing hole  20 Hc of the pressing member  20 H is fit to the circumferential groove  23 Kj of the fitting convex portion  23 Ki in the pressing member fixing portion  23 Ka. Further, by sliding the pressing member  20 H in the direction shown by the arrow H, the notch portion  20 Hf of the pressing member  20 H is engaged to the fitting convex portion  23 Ki of the pressing member fixing portion  23 Ka, thereby entering the status shown in  FIG. 88 . 
     In this case, by fitting the small-diameter portion of the piercing hole Hc of the pressing member  20 H to the circumferential groove  23 Kj of the fitting convex portion  23 Ki in the pressing member fixing portion  23 Ka, the movement of the pressing member  20 H in the direction shown by an arrow J in  FIG. 88  is prevented. Further, by engaging the notch portion  20 Hf of the pressing member  20 H to the fitting convex portion  23 Ki of the pressing member fixing portion  23 Ka, the pressing member  20 H regulates the rotation of the notch portion  20 Hf in the direction shown by an arrow k with the fitting convex portion  23 Ki of the pressing member fixing portion  23 Ka as center. Thus, the pressing member  20 H is accurately fixed to the pressing member fixing portion  23 Ka. 
     As mentioned above, the convex portions  20 Hd of the pressing members  20 H press a plurality of predetermined portions at the peripheral portion of the dust-proofing filter  21  by fitting and fixing the pressing member  20 H to the pressing member fixing portion  23 Ka of the dust-proofing filter supporting member  23 K via the dust-proofing filter  21  interposed. Consequently, the pressing member  20 H presses the dust-proofing filter  21  at a plurality of portions at the peripheral portion thereof with point contact. 
     As mentioned above, according to the thirty-third embodiment, the means for fixing the plurality of pressing members  20 H to the dust-proofing filter supporting member  23 K is the so-called fitting-type fixing means without the screw or the like. Thus, the assembling process upon manufacturing is simplified and this contributes to the improvement in efficiency of the manufacturing process. Further, this contributes to the reduction in manufacturing costs. 
       FIG. 89  is a main-part enlarged exploded perspective view showing by extracting a part of an image pick-up device unit in a camera according to the thirty-fourth embodiment of the present invention, namely showing an example of a pressing member  20 J when the convex portions  20 Hd are omitted from the pressing members  20 H according to the thirty-third embodiment. Other structure is the same as that according to the thirty-third embodiment. 
     According to the thirty-fourth embodiment, the pressing member  20 J is pressed to the dust-proofing filter  21  at a plurality of portions with plane contact. That is, the pressing member  20 J presses the dust-proofing filter  21  with plane contact. However, as compared with the case of using the circular-shaped pressing member according to the twenty-sixth to thirty-first embodiments, the contact area becomes small. Therefore, a factor against the vibrations of the dust-proofing filter  21  is small. 
       FIG. 90  is a main-part enlarged exploded perspective view showing by extracting a part of an image pick-up device unit in a camera according to the thirty-fifth embodiment of the present invention, namely showing an example of a pressing member  20 K when a convex groove  20 Ce is formed in place of the convex portion  20 Hd of the pressing member  20 H. Other structure is the same as that according to the thirty-third embodiment. 
     According to the thirty-fifth embodiment, the pressing member  20 K presses the dust-proofing filter  21  with line contact at a plurality of positions. 
     According to the above embodiments, the pressing member is made of the elastic member such as the plate-shaped spring. In views of the elastic force and the intensity of the member necessary for pressing and fixing the pressing member to the dust-proofing filter supporting member (sealing structure), the material of the pressing member is generally made of metal. 
     However, when the pressing member is made of only a hard material such as metal, the vibrations of the dust-proofing filter are inhibited at the contact portion between the pressing member and the dust-proofing filter. 
     Then, it is considered that the pressing member is made of resin such as a plastic material or a soft material such as hard rubber. 
     For example,  FIG. 91  is a sectional view showing only the pressing member in a camera according to the thirty-sixth embodiment of the present invention. According to the thirty-sixth embodiment, an example is given of formation integral with the convex portion  30   d  at a predetermined portion of the pressing member  30 A. 
     According to the thirty-sixth embodiment, the pressing member  30 A is made of resin such as a plastic material or a soft material such as hard rubber, having elastic force. In this case, the convex portion  30   d  of the pressing member  30 A may be formed with the shape of the convex portion  20 Hd (refer to  FIG. 88 ) of the pressing member  20 H according to the thirty-third embodiment or the shape of the convex portion  20 Ke (refer to  FIG. 90 ) of the pressing member  20 K according to the thirty-fifth embodiment. In this case, the convex portion  30   d  of the pressing member  30 A presses a predetermined circular-shaped area of the peripheral portion of the dust-proofing filter  21  with point contact or with the line contact. 
     Other structure is the same as that according to the thirty-second to thirty-fifth embodiments. 
     According to the thirty-sixth embodiment, the material of the pressing member  30 A is changed. Thus, the pressing member  30 A can be easily applied to the circular-shaped pressing member according to the twenty-sixth to thirty-first embodiments. 
     Depending on a pressing member, the elastic force is further necessary as compared with the pressing member  30 A shown in  FIG. 91 . A pressing member shown in  FIG. 92  is applied to one requiring the larger elastic-force. 
       FIG. 92  is a sectional view showing only a pressing member according to the thirty-seventh embodiment of the present invention. 
     According to the thirty-seventh embodiment, the pressing member  30 B has the member  32  made of the similar material as that of the pressing member  30 A (refer to  FIG. 91 ) according to the thirty-sixth embodiment with the similar shape around a plate-shaped metal member  31 . 
     In other words, upon attaching the pressing member  30 B to the dust-proofing filter supporting member ( 23 C), a convex portion  30   d  is formed at a portion where the pressing member  30 B should be abutted onto the dust-proofing filter  21 . 
     As mentioned above, according to the thirty-sixth and thirty-seventh embodiments (refer to  FIGS. 91 and 92 ), at least the portion which is abutted on the dust-proofing filter  21  in the pressing members  30 A and  30 B, namely, the convex portion  30   d  is made of the resin such as a plastic material or of hard rubber. 
     In the image pick-up device unit ( 15 ) using the thus-formed pressing member  30 A or  30 B, upon applying the predetermined vibrations to the dust-proofing filter  21  by applying the periodic voltage to the piezoelectric element  22  at a predetermined timing, it is suppressed that the vibration of the dust-proofing filter  21  is transmitted to the pressing member  30 A or  30 B itself. 
     The material to be vibrated for the purpose of the dust-proofing is only the dust-proofing filter  21  and another member does not need to be vibrated. However, the pressing members  30 A and  30 B absorb the vibration transmitted from the dust-proofing filter  21  by making the convex portion  30   d  of the pressing members  30 A and  30 B of the soft material. 
     Therefore, the pressing members  30 A and  30 B press the dust-proofing filter  21  toward the dust-proofing filter supporting member ( 23 ) and form a part of the holding structure for fixing and holding the dust-proofing filter  21  while holding the contact state between the dust-proofing filter  21  and the dust-proofing filter supporting member ( 23 ). Further, the pressing members  30 A and  30 B function as members for absorbing the vibrations which suppress the transmission of the vibrations to another member via the pressing members  30 A and  30 B interposed from the dust-proofing filter  21 . 
     A pressing member also functioning as the member for absorbing the vibrations is considered as follows. 
     That is,  FIGS. 93 and 94  are diagrams showing the thirty-eighth embodiment of the present invention.  FIG. 93  is a sectional view showing by extracting only a pressing member.  FIG. 94  is a main-part enlarged sectional view showing an enlarged part of an image pick-up device unit using the pressing member shown in  FIG. 93 . 
     According to the thirty-eighth embodiment, the pressing member  30 C is made of a hard material such as metal, and comprises a plate-shaped spring member  34  having elastic force and a vibration absorbing member  33  arranged at a predetermined position of the plate-shaped spring member  34 . 
     The vibration absorbing member  33  is made of a soft material, e.g., felt, urethane, soft plastic, or rubber, and is adhered to a predetermined position of the plate-shaped spring member  34  by an adhesive or a two-sided tape. 
     Referring to  FIG. 94 , in a state in which the pressing member  30 C is fixed to the projecting portion  23   a  of the dust-proofing filter supporting member  23  by the fixing screw  20   a , the vibration absorbing member  33  adhered to the pressing member  30 C is set to be abutted on a portion as a node for the vibrations of the dust-proofing filter  21 . 
     Other structure is the same as that according to the thirty-second embodiment. 
     As mentioned above, according to the thirty-eighth embodiment, the pressing member  30 C is formed by adhering the vibration absorbing member  33  at the predetermined position of the plate-shaped spring member  34  as the plate-shaped hard member having the elastic force. Thus, as compared with the case in which the contact shape between the pressing member  30 C and the dust-proofing filter  21  becomes a point or a line, the dust-proofing filter  21  is pressed with a slightly wide range. Therefore, the pressing operation is accurately performed and the vibrations are stably ensured without inhibiting the vibrations of the dust-proofing filter  21 . 
     In addition, the pressing member  30 C is made with an extremely simple structure and, therefore, this contributes to the improvement in efficiency of the manufacturing and to the reduction in manufacturing costs. 
     Meanwhile, according to the twenty-sixth embodiment, the pressing member  20 B forming a part of the holding structure is formed with the circular shape. Thus, the peripheral portion of the dust-proofing filter  21  is pressed. Consequently, the peripheral portion of the dust-proofing filter  21  is covered with the pressing member  20 A. 
     As mentioned above, the dust-proofing filter  21  is formed of an optical member opposed to the image pick-up device  27  in the front thereof at a predetermined interval. The dust-proofing filter  21  is arranged on the optical path of the subject beams which are transmitted through the photographing optical system  12   a  and reach the photoelectrically converting surface of the image pick-up device  27 . 
     In this case, through the dust-proofing filter  21 , laser beams (hereinafter, referred to as harmful beams) are transmitted, except for the laser beams contributing to the transmission through the photographing optical system  12   a  and to the formation of the subject image onto the photoelectrically converting surface of the image pick-up device  27 . The harmful beams are mixed in a predetermined area on the photoelectrically converting surface, namely, an area where the image signal for display or recording operation is to be obtained and, then, flare, ghost, etc. are caused on the image formed based on the captured image signal. Further, the flare, ghost, etc. exert an adverse influence on the color, brightness, contrast, etc., thereby deteriorating the picture quality. 
     Means for solving the problems are described hereinbelow. 
       FIG. 95  is a perspective view showing only a pressing member used for an image pick-up device unit in a camera according to the thirty-ninth embodiment of the present invention. 
     According to the thirty-ninth embodiment, the circular-shaped pressing member is used and this structure is the same as that according to the twenty-sixth to thirty-first embodiments and only the pressing member is different. Therefore, the same structure as that according to the twenty-sixth embodiment is not illustrated and is not described in detail, only the different member (pressing member) is described hereinbelow. 
     According to the thirty-ninth embodiment, a pressing member  20 L forming a part of a holding structure is made of an elastic member such as a plate-shaped spring, and has a rectangular-shaped opening  20 Ln substantially in the center thereof. The opening  20 Ln has a shape corresponding to a valid area of the photoelectrically converting surface of the image pick-up device  27 , and the shape is set so that only the beams contributing to the formation of the subject image are transmitted. 
     In other words, according to the thirty-ninth embodiment, the pressing member  20 L has a function for pressing the dust-proofing filter  21  toward the dust-proofing filter supporting member  23  and for fixing and holding the dust-proofing filter  21 . In addition, according to the thirty-ninth embodiment, the pressing member  20 L has a function for limiting the passage of transmitted beams upon transmitting the subject beams after being transmitted through the photographing optical system  12   a , through the dust-proofing filter  21 , and for stopping the beams reaching the photoelectrically converting surface of the image pick-up device  27 . 
     That is, the pressing member  20 L has a function for suppressing the reach of the harmful beams to the photoelectrically converting surface of the image pick-up device  27 . 
     Other structure is the same as that according to the twenty-sixth embodiment. 
     As mentioned above, according to the thirty-ninth embodiment, the opening  20 Ln of the pressing member  20 L is formed with a rectangular shape corresponding to the photoelectrically converting surface of the image pick-up device  27 . In this case, the pressing member  20 L is formed with the shape for covering the adjacent portion of the peripheral portion of the dust-proofing filter  21  pressed by the pressing member  20 L, namely, the portion other than the predetermined portion of the dust-proofing filter  21  corresponding to the opening  20 Ln of the pressing member  20 L. Therefore, the pressing member  20 L has a stop function for limiting the passage of the beams other than the valid beams contributing to the formation of the image formed by the beams incident on the dust-proofing filter  21 , that is, the passage of the harmful beams causing the flare, ghost, etc. 
     Consequently, the occurrence of the flare, ghost, etc. is suppressed and, a preferable image signal is displayed or is recorded. The image displayed based on the image signal assures a preferable picture quality. 
     According to the above embodiments, the example is given of the camera in which the image pick-up optical system is detachably attached to the main body unit of the camera, that is, the interchangeable single-lens reflex camera, and is described in detail. The configuration of the camera is not limited to the above description and the spirit of the present invention does not necessarily require this configuration. 
     It should be understood that the present invention is not limited to the precise disclosed embodiments, and various changes and modifications thereof can be made without departing from the spirit or scope of the invention.