Video scope

Abstract: A video scope, has a grip portion (2) to be held by an operator; an entering portion (11) for entering an object; and a pickup holding portion (3) provided at a tip end of the entering portion, wherein the pickup holding portion (3) is provided with picking up means of picking up an object to be picked up from at least two directions.

Description: The present invention relates to a video scope according to the generic clause of claim 1 incorporating a solid state imaging device such as CCD, and more particularly to a video scope to be used for photographing a diseased part within an oral cavity in dental surgery, an oral cavity surgical department, or the like. From document US-A-5976076 there is known a video scope according to the generic clause of claim 1, which has a grip and an entering portion and an image pickup means, which picks up an image from the two directions. Document DE4307411A shows a video scope having a grip portion, an entering portion, a portion for holding image pickup means provided at the tip of the entering portion, wherein said portion for holding image pickup means is provided with image pickup means, wherein while the pickup means are moved a 3-D image is also possible, and wherein the portion for holding the pickup means is substantially U-shaped having a central portion and two wings. In recent years, in dental surgery, an oral cavity surgical department or the like, our way of thinking has advanced from medical treatment to prevention. This preventive medical examination starts with grasping the state of the interior of a patient's oral cavity, and as its method, a photograph for the interior of oral cavity has been taken through the use of a video scope using a solid state imaging device such as CCD, and has been preserved as a record. Also, conventionally, a dental mirror with a small diameter was generally used at the time of examining a state of the interior of an oral cavity in the dental surgery, but in recent years, in the observation of the interior of an oral cavity, and informed consent in which an image on a monitor TV is shown to a patient for explanation, or the like, a video scope using a solid state imaging device such as CCD has been put to practical use. As such a conventional video scope, there is a video scope for holding it in one hand to pick up a tooth from the oral cavity or by inserting the tip end portion into the oral cavity as disclosed in Japanese Patent Laid-Open No. 8-332170 (USP5,745,165). However, since such a conventional video scope photographs teeth in units of one tooth or a plurality of teeth through a pickup incident window provided at a place on the side, the inclined plane of the tip end or the end surface thereof only from one direction, there is a problem that in order to pick up the inner part (the back side) of the oral cavity, the lip side (the surface side) and the clenched teeth surface side for all teeth, there are a great number of times of movement and image pickup and it takes a lot of time. Also, since the back side, the surface side and the clenched teeth surface side of all the teeth are separately picked up, it is difficult to specify which tooth an image obtained by picking up indicates, when an image is picked up by holding a video scope from the same direction, it is difficult to pigeonhole the pickup data because the image is turned upside down between the back side and the surface side of the tooth, or between an upper chin tooth and a lower chin tooth. Also, since a distance between a tooth, which is an obj ect to be picked up, and the video scope is prone to fluctuate, it is necessary to correct image shakes due to hand shakes, thus necessitating a complicated operation. Also, in the case of a disease in which a teeth is cracked, it is difficult to find out the position of the crack in pickup from one direction, and to observe it. The present invention has been achieved in the light of such points, and is aimed, for example, to provide a simple, easy-to-use video scope capable of picking up an object to be picked up from at least two directions at the same time, picking up an image in a short time and easily pigeonholing data obtained by picking up, and further easily picking up a crack in the object to be picked up, without problems resulting from handshaking. This object is met by the characterizing features of claim 1. Prefered embodiments are shown in the subclaims. A video scope according to the present invention is capable of picking up an image for the object to be picked up from plural directions easily in a short time. Also, since images from plural directions are picked up at the same time, it is easy to specify which object to be picked up an image obtained by picking up is, and it is easy to pigeonhole data obtained by picking up. According to the invention, it is possible to easily pick up images for the object to be picked up from three directions through the use of three pickup systems in a short time. Also, a central portion of a substantially quasi-horseshoe-shaped pickup holding portion is caused to abut upon a portion to be picked up for picking up, whereby the distance between the object to be picked up and the pickup system is fixed, and image shakes due to hand shakes are eliminated, and therefore, it is not necessary to achieve focus, resulting in excellent operability. According to the invention in addition to the above described effects, any solid state imaging device becomes unnecessary for wing portions within the pickup holding portion, and therefore, the wing portions within the pickup holding portion become smaller in a widthwise direction, and as a result, the pickup holding portion can be miniaturized. According to the invention it is possible to pick up images for the object to be picked up from two directions easily in a short time through the use of first and second pickup systems . Also, the central portion of the substantially quasi-horseshoe-shaped pickup holding portion is caused to abut upon the portion to be picked up for picking up, whereby the distance between the object to be picked up and the pickup system is fixed, and image shakes due to hand shakes are eliminated, and therefore, it is not necessary to achieve focus, resulting in excellent operability. Further, through the use of the second pickup system, transmitted light from a light source provided in one of the wing portions within the pickup holding portion is picked up, whereby it is possible to easily observe a crack in the object to be picked up. With the provision of an incident window , the pickup holding portion can be made into an airtight or watertight structure, and therefore, it is possible to prevent any foreign matter from entering the interior of the pickup holding portion to affect the pickup system and to easily wash it. Then, it is possible to change angles between a grip portion, an entering portion and the pickup holding portion in accordance with a shape of the portion to be picked up, resulting in excellent operability. An object and an object to be picked up which are used in the present invention are both not particularly limited, but if the object is the interior of an oral cavity and the object to be picked up is a tooth, especially high effect will be obtained. Any solid state imaging device may be used as long as it can be installed within the pickup holding portion and can pick up an obj ect to be picked up, and for example, a CCD imaging device, a MOS type imaging device or the like can be named. The reflector is not particularly limited, but for example, a prism mirror, a mirror or the like can be used. Any light source may be used as long as it can be installed within the pickup holding portion and has sufficient illuminance for picking up the object to be picked up, and for example, a lamp, a LED or the like can be named. Of these, a white LED has lower power consumption than lamps, and has a long life, and therefore it is maintenance-free, and is preferable. Any incident window may be used as long as it is made of material capable of guiding image pickup light, and for example, glass, transparent resin or the like can be named. The shape may be the substantially quasi-horseshoe-shaped, and windows divided in three surfaces of the pickup holding portion respectively may be used. FIG. 1 is an external view showing a video scope according to an embodiment of the present invention; FIG. 2 is a partially enlarged sectional view for the video scope according to an embodiment of the present invention; FIGS. 3A to 3C are actual views showing an image obtained by picking up with the video scope according to an embodiment of the present invention; FIG. 4 is a partially enlarged sectional view for a video scope according to another embodiment of the present invention; FIG. 5 is a partially enlarged sectional view for a video scope according to another embodiment of the present invention; and FIG. 6 is an actual view showing an image obtained by picking up with a video scope according to another embodiment of the present invention. Description of Symbols 1 Entering Portion 2 Grip Portion 3 Pickup Holding Portion 4 Incident Window 5 Objective Lens 6 CCD Unit 7 White LED 8 Video Output Cable 9 Mirror 10 Substrate 11 Bent Entering Portion 12 Central Portion 13 Wing Portion 14 Tooth (First Embodiment) Next, with reference to FIGS. 1 to 3, the description will be made of a first embodiment of the present invention. FIG. 1 is an external view showing a video scope; FIG. 2 is a partially enlarged sectional view for the video scope; and FIGS. 3A to 3C are actual views showing an image for the interior of the oral cavity obtained by picking up with the same video scope. In FIGS. 1 and 2, reference numeral 1 denotes an entering portion for entering the interior of the oral cavity, which is the object; and 2, a grip portion which an operator holds in one hand. The entering portion 1 has, at its tip end portion, a bent entering portion 11 which is bent. At the tip end of the bent entering portion 11, a substantially quasi-horseshoe-shaped pickup holding portion 3 is mounted air-tightly or water-tightly and pivotally with an opening side of a substantially quasi-horseshoe-shaped directed downward. It is made into the air-tight or water-tight structure in order to prevent saliva or the like from entering. In order to enable the pickup holding portion 3 to rotate up to a position parallel with or to orthogonally intersect the entering portion 1, an angle of rotation is preferably about 180°. On an inner wall in the central portion 12 and inner walls of twowingportions 13 in the substantially quasi-horseshoe-shaped portion of the pickup holding portion 3, there is hermetically formed an incident window 4 made of glass capable of guiding image pickup light respectively. Further, inside the central portion 12 of the pickup holding portion 3, and inside two wing portions 13 located to oppose to each other at both ends of the central portion 12, a pickup system provided with a CCD unit 6, which is a solid state imaging device, and an objective lens 5, and a white LED 7 as a light source for throwing light are incorporated respectively, and illumination light is thrown through the incident window 4. The objective lens 5 is provided with an iris diaphragm, but it is omitted in this figure. In the grip portion 2, a camera circuit for operating the CCD unit 6 and the white LED 7 is incorporated, and power supply for driving the camera circuit and the white LED7 is mounted. For this power supply, low voltage power supply such as, for example, an alkaline battery, a lithium battery and a charging type battery can be used, and a combination of a detachable battery pack and a charger may be used. The camera circuit and power supply are omitted in this figure. From the rear of the grip portion 2, a video output cable 8 connected to a display such as a monitor TV is drawn out. This video output cable 8 is water-tightly configured over the rear from within the grip portion 2. Also, these camera circuit and power supply may not be incorporated in the grip portion 2, but be configured separately. Also, as regards the angle of view, a range of about one tooth can be observed for a molar, and a range of about three teeth can be observed for a small tooth such as a fore-tooth and a dogtooth. A video scope according to the present embodiment is capable of observing a clenched teeth surface (FIG. 3B) of teeth, the back side of a tooth, which is the inner part of the oral cavity, and its gum portion (FIG. 3A), and the surface side of a tooth, which is the lip side, and its gum portion (FIG. 3C) at the same time as shown in FIG. 3 through the use of three pickup systems by inserting the entering portion 1 into the oral cavity holding the grip portion 2 to cause the pickup holding portion 3 to abut upon a tooth 14 in such a manner as to cover the tooth 14, which is the object to be picked up, with the substantially quasi-horseshoe-shaped. Also, since images from three directions can be picked up at the same time, time required for picking up can be shortened, the consultation time can be shortened, and it is easy to specify which object to be picked up an image obtained by picking up is, and it is easy to pigeonhole the data obtained by picking up. At the time of observing a back tooth such as a molar, the lip is kept out of the way of the entering portion 1 by rotating the pickup holding portion 3 as shown in a chain line in FIG. 1, and therefore it is easy to use. Also, since the pickup holding portion 3 is caused to be in contact with the tooth 14, the distance between the tooth 14 and the pickup system is fixed, no image shakes due to hand shakes are caused, there is no need for focusing, and the pickup holding portion 3 can be caused to slide along the tooth 14 while being in contact therewith. Therefore, it has excellent operability. Also, if the system has image storing means of storing an image, the image data will be able to be simply pigeonholed. (Second Embodiment) Next, with reference to FIG. 4, the description will be made of a second embodiment of the present invention. FIG. 4 is a partially enlarged sectional view for a video scope, and in FIG. 4, on the inner surface of a substantially quasi-horseshoe-shaped pickup holding portion 3, an incident window 4 made of glass capable of guiding light is hermetically fixed. Reference numeral 7 denotes a white LED for throwing light, and the light is thrown through the incident window 4. Within two wing portions 13 of the pickup holding portion 3, a mirror 9 is incorporated as a reflector for side viewing. Also, inside the central portion 12 of the pickup holding portion 3, a pickup system provided with an objective lens 5 and a CCD unit 6, and on both sides thereof, pickup systems, each provided with an objective lens 5 for focusing an input image from a mirror 9 and a CCD unit 6 are fixed in parallel on a substrate 10 and are incorporated. The objective lens 5 is provided with an iris diaphragm, but it is omitted in this drawing. The configuration of portions other than the pickup holding portion 3 is the same as in the first embodiment, and as shown in FIG. 1, the pickup holding portion 3 is pivotally mounted'onto a bent entering portion 11 at the tip end of the entering portion 1. A video scope according to the present embodiment is capable of picking up images for a tooth 14, which is a object to be picked up, at the same time from three directions through the use of the pickup systems and two mirrors 9, and the configuration of portions other than the pickup holding portion 3 is the same as in the first embodiment. Therefore, the same effects as in the first embodiment can be obtained. In addition, three CCD units 6 are fixed onto one sheet of substrate 10, whereby the configuration of the interior of the pickup holding portion 3 and wiring are simplified, and there are no CCD units within the wing portions 13 of the pickup holding portion 3. Therefore, the wing portions 13 of the pickup holding portion 3 become smaller in a widthwise direction, and as a result, the pickup holding portion can be miniaturized. In the present embodiment, the configuration in which three CCD units 6 are fixed to the substrate 10 has been used, but in place thereof, there may be used a configuration, in which one CCD unit is fixed onto the substrate 10, and at the central portion of the CCD unit, an image for the object to be picked up which has passed through the objective lens 5 without passing through the mirror 9 is directly inputted, and at end portions of the CCD unit, an image for the object to be picked up which has passed through the objective lens 5 through the mirror 9 is inputted. At this time, the mirror 9 is set to an appropriate angle depending upon a size of the CCD unit, positions of the objective lenses or the like. (Third Embodiment) Next, with reference to FIGS. 5 and 6, the description will be made of a third embodiment of the present invention. FIG. 5 is a partially enlarged sectional view for the video scope; and FIG. 6 is an actual view partially showing an image for the interior of the oral cavity obtained by picking up with the same video scope. In FIG. 5, on the inner surface of the substantially quasi-horseshoe-shaped pickup holding portion 3, an incident window 4 made of glass capable of guiding light is hermetically fixed. Within the pickup holding portion 3, a-first pickup system provided with an objective lens 5 and a CCD unit 6 is incorporated in the central portion 12, a white LED 7 as a light source is provided facing the opposite side in one of the wing portions 13, and a second pickup system provided with an objective lens 5 and a CCD unit 6 is incorporated in the other wing portion 13. The objective lens 5 is provided with an iris diaphragm, but it is omitted in this figure. The configuration of portions other than the pickup holding portion 3 is the same as in the first embodiment, and as shown in FIG. 1, the pickup holding portion 3 is pivotally mounted onto a bent entering portion 11 at the tip end of the entering portion 1. A video scope according to the present embodiment is capable of observing a clenched surface of teeth, the back side of a tooth, which is the inner part of the oral cavity, and its gum portion, or the surface side of a tooth, which is the lip side, and its gum portion at the same time through the use of the first and second pickup systems by inserting the entering portion 1 into the oral cavity, which is an obj ect, holding the grip portion 2 to cause the pickup holding portion 3 to abut upon a tooth 14 in such a manner as to cover the tooth 14, which is the object to be picked up, with the substantially quasi-horseshoe-shaped. Also, since images from two directions can be picked up at the same time, time required for picking up can be shortened, the consultation time can be shortened, it is easy to specify which object to be picked up an image obtained by picking up is, and it is easy to pigeonhole the data obtained by picking up. Since the pickup holding portion 3 is pivotally mounted at the tip end of the entering portion 1 in the same way as the first embodiment, the lip is kept out of the way of the entering portion 1 even when a back tooth such as a molar is observed and therefore it is easy to use. Also, since the pickup holding portion 3 is caused to be in contact with the tooth 14 in the same way as the first embodiment, the distance between the tooth 14 and the pickup system is fixed, and no image shakes due to hand shakes are caused, there is no need for focusing, and the pickup holding portion 3 can be caused to slide along the tooth 14 while being in contact therewith. Therefore, it has excellent operability. Also, if the system has image storing means of storing an image, the image data will be able to be simply pigeonholed. Further, through the use of the second pickup system, transmitted light from the white LED7 which has permeated the tooth 14 is picked up, whereby if the tooth 14 is cracked, its portion appears on the screen as shown in FIG. 6, and can be easily observed. In this respect, through the use of a video scope according to the first embodiment, a white LED provided within one of the wing portions of the pickup holding portion is switched off, and through the use of the CCD unit provided there, transmitted light, which permeated the tooth, from the white LED provided within the other wing portion is picked up, whereby a crack in the tooth can be easily observed in the same way as the video scope according to the third embodiment. As described above, a video scope according to the present invention, for example, is capable of picking up an object to be picked up from at least two directions at the same time, simply and easily picking up in a short time, and easily pigeonholing data obtained by picking up. Also, a crack on the object to be picked up can be easily picked up.

Claims: A video scope, comprising: a grip portion (2) to be held by an operator; an entering portion (1) for entering an object; and a portion for holding image pickup means (3) provided at a tip end of said entering portion (1), wherein said portion for holding image pickup means (3) is provided with image pickup means (5,6) for picking up an image of an object to be picked up from at least two directions, characterized in that said portion for holding image pickup means (3) is substantially quasi-horseshoe-shaped having a central portion (12) and two wing portions (13), which are located at both ends of said central portion so as to oppose to each other, wherein either said image pickup means has a pickup system that is provided within said central portion (12) of said portion for holding image pickup means and within said two wing portions (13), respectively, or the image pickup means has a pickup system (5,6) provided within said central portion (12) of said portion for holding image pickup means and reflectors (9) provided within said two wing portions (13), respectively, or the image pickup means has a first image pickup system provided within the central portion (12) of said portion for holding image pickup means, a light source (7) provided within one of said wing portions (13) and a second image pickup system (5,6) provided within the other of said wing portions (13). The video scope according to claim 1, wherein the pickup systems include at least an objective lens (5) and a solid state imaging device (6). The video scope according to any one of claims 1 or 2, further comprising an incident window (4) for pickup light in an inner wall of said central portion of said portion for holding image pickup means and in inner walls of said two wing portions respectively. The video scope according to any one of claims 1 to 3, wherein the tip end (11) of said entering portion (1) is bent, and said portion for holding image pickup means (3) is pivotally provided at the tip end of said entering portion.

Inventors: OOSHIMA KIYOKO, UCHIDA SHINJI, OOSHIMA, KIYOKO, UCHIDA, SHINJI
Applicants: MATSUSHITA ELECTRIC IND CO LTD, MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Application year: 2001
Main classification: A61B1
IPC codes: A61B1