Patent Publication Number: US-10788734-B2

Title: Instant film pack and device using the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Continuation of PCT International Application No. PCT/JP2018/001921 filed on 23 Jan. 2018, which claims priority under 35 U.S.C. § 119(a) to Japanese Patent Application No. 2017-022852 filed on 10 Feb. 2017. The above application is hereby expressly incorporated by reference, in its entirety, into the present application. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an instant film pack and a device using the same such as a developer spreading device, a printer, and a camera. 
     2. Description of the Related Art 
     In a box-shaped case, an instant film pack in which a plurality of mono-sheet type instant film units (hereinafter, abbreviates to film units) is accommodated in a box-shaped case has been variously sold. The case is made of a synthetic resin having light shielding properties, and an exposure opening which exposes an exposure surface of the film unit and a slit-shaped discharge port through which the film unit is discharged from the case are formed in the case. The instant film pack is used in a device such as an instant camera or a printer, and is loaded into a film pack room provided in the device for each case. 
     In a case where the instant film pack is not used, the discharge port and the exposure opening are closed to shield an inside of the case from light. A light shielding sheet formed of a synthetic resin film having light shielding properties is attached from the outside to the discharge port such that the discharge port is shielded from light. Also, the exposure opening is blocked from the inside by a film cover which is accommodated together with the film unit. The film cover is formed in a thin plate shape by using a synthetic resin having light shielding properties, and is disposed between the exposure opening and the front-most film unit. Light shielding ribs that engage with grooves, which are disposed on an exposure opening side on an inner wall surface of the case, to improve light shielding properties within the case are formed in the film cover. 
     An ejection mechanism for ejecting the film cover and the exposed film unit to the outside of the device is built in the device that uses the instant film pack. The ejection mechanism includes a claw member, a claw member driving mechanism, a transport roller pair, and a spreading roller pair. The claw member is inserted into a cut-off portion formed in a lower side of a front surface of the case from below, and holds a lower end edge of the film unit to push up the film unit toward the discharge port. The claw member driving mechanism drives the claw member. The transport roller pair rotates while pinching the film unit discharged from the case, and transports the film unit. The spreading roller pair ejects the film unit from the transport roller pair to the outside of the device, and simultaneously spreads a developer. 
     The most problem caused in the device that uses the instant film pack is an ejection error which occurs in a case where the film unit is ejected from the case. The cause is mainly warpage, deformation or the like of the film unit, and in particular, the cause is a large variation in shape of both end portions of the film unit. For this reason, an end of the film unit may be stopped by the discharge port of the case. 
     Since the ejection mechanism is mainly designed in order to appropriately eject the film unit and appropriately spread the developer, a high load is applied in a case where a film cover having stiffness higher than that of the film unit is ejected, and thus, failure is caused. In order to solve the problem, a thickness of the film cover is reduced. However, in a case where the thickness of the film cover is excessively thin, the film cover is co-ejected with (accompanies) the film unit positioned in the foremost row in a case where the film cover is ejected. Therefore, on the surface of the film cover on the side facing the exposure opening, a push-up rib (accompanying prevention rib) is formed along an ejecting direction, the push-up rib which is in contact with the inner wall surface of the case to push up the film cover to the film unit side. The push-up rib prevents the film cover and the film unit from being ejected together such that the film unit does not face the discharge port during the ejection of the film cover (see JP2000-081689A (corresponding to U.S. Pat. No. 6,183,114B1)). 
     SUMMARY OF THE INVENTION 
     With the demand for diversification of the film unit size, for example, a substantially square-shaped film unit having a square size which is wider and longer than the film unit according to the related art, is desired. In the film unit having such a square size, the film cover covering the exposure surface of the film unit also has a larger size than the sizes of the related art. Therefore, as the size increases, distortion during molding is more likely to occur than in the related art, and the film cover may be deformed into a spherical shape in which a center portion is recessed and a peripheral part is protruded. 
     The spherically deformed film cover is accommodated in the case together with a plurality of film units. A support piece and a support rib are formed on a cover in the case so as to protrude, and a front-most film cover or film unit is pressed against an edge of the exposure opening of the case. In addition, in a case where the film pack is loaded into a film pack room such as a camera or a printer, the press member in the film pack room enters the case through the opening of the cover, presses a film unit press plate in the case, and presses the film cover or the film unit positioned in the foremost row against the edge of the exposure opening of the case. 
     Therefore, in a case where the square-sized film cover is larger than that of the related art, the amount of deformation of the film cover becomes significant, and there is a concern that both side edge portions of the film cover may be stopped on both end portions of the discharge port of the case. In a case where the both side edge portions are stopped, the film cover cannot be ejected. 
     The present invention has been made in order to solve the problems, and an object of the present invention is to provide an instant film pack that prevents an ejection error of the film cover and a device using the same. 
     In order to solve the above problems, an instant film pack according to the present invention comprises a plurality of film units, a case, a film cover, an accompanying prevention rib, and a bending guide portion. The film unit has a developer pod which contains a developer. The case has an exposure opening and a slit-shaped discharge port, and laminates and accommodates the plurality of film units. The film cover covers an exposure surface of the film unit to lighttightly block the exposure opening and is ejected from the discharge port. The accompanying prevention rib is formed at a distal end portion on a front surface of the film cover facing the exposure opening so as to protrude from both side edge portions with a height equal to a gap of the discharge port, and preventing the film unit positioned in the topmost layer from being ejected. The bending guide portion tilts an outer portion of the accompanying prevention rib of the film cover in a protruding direction of the accompanying prevention rib. 
     It is preferable that the film cover is a synthetic resin molded item having light shielding properties, and the bending guide portion is a groove formed on the outer portion along the accompanying prevention rib on the outside of the accompanying prevention rib in a width direction of the film cover. 
     It is preferable that the accompanying prevention rib has a tilt surface whose protruding height gradually decreases toward the distal end of the film cover. 
     It is preferable that a developer spreading device according to the present invention comprise the instant film pack which accommodates the film unit including a mask sheet, a photosensitive sheet which is pasted onto the mask sheet, a cover sheet which is pasted onto the photosensitive sheet and includes a front surface as the exposure surface, and the developer pod which is formed at a distal end portion in a transport direction perpendicular to a width direction of the exposure surface and contains the developer, a transport roller pair, a spreading roller pair, a control member, and an ejection guide. The transport roller pair transports the film unit discharged through the discharge port while pinching the film unit. The spreading roller pair is arranged on a downstream side of the transport roller pair in the transport direction, and spreads the developer between the photosensitive sheet and the cover sheet by crushing the developer pod while pinching the film unit. The control member is formed to extend in the width direction of the exposure surface between the transport roller pair and the spreading roller pair, and a distal end of which is in contact with the film unit to control a distribution of the developer spread by crushing of the developer pod. The ejection guide is formed on an outlet side of the spreading roller pair from which the film cover is ejected, in a state in which the film cover passes through the spreading roller pair, and guides the outer portion of the accompanying prevention rib bent by the bending guide portion to the outlet. 
     It is preferable that the ejection guide includes a guide passage that guides the distal end portion of the film cover delivered from the spreading roller pair towards a film ejection port, the guide passage has a tilt surface that is provided to be tilted with respect to a proximal end surface, and a tilt angle of the tilt surface with respect to the proximal end surface is 15° or more and 55° or less. 
     A printer according to the present invention comprises the developer spreading device, and an exposure head. The exposure head is provided on an upstream side of the developer spreading device in the transport direction, and irradiates the exposure surface of the film unit transported by the transport roller pair with line-shaped print light parallel to the width direction of the exposure surface. 
     A digital camera according to the present invention comprises the printer, and an imaging unit. The imaging unit includes an imaging optical system, captures a subject image, and outputs image data to the printer. 
     According to the present invention, it is possible to prevent the ejection error of the film cover. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a front perspective view of a digital camera with a printer. 
         FIG. 2  is a front view of the digital camera with a printer. 
         FIG. 3  is a sectional view taken along line III-III of  FIG. 2 . 
         FIG. 4  is a rear perspective view of the digital camera with a printer. 
         FIG. 5  is a perspective view of an instant film pack. 
         FIG. 6  is a sectional view of the instant film pack. 
         FIG. 7  is an exploded perspective view of the instant film pack. 
         FIG. 8  is a sectional view of the instant film pack. 
         FIG. 9  is a sectional view of a film unit. 
         FIG. 10  is a front view of the film unit. 
         FIG. 11  is a perspective view of a developer pod in a state in which a packaging material is opened. 
         FIG. 12  is a perspective view of a film cover. 
         FIG. 13  is a sectional view of the film cover. 
         FIG. 14  is a perspective view showing bending guide grooves. 
         FIG. 15A  is a front view showing a discharge port and a film cover which includes bending guide grooves according to the present invention. 
         FIG. 15B  is a front view showing a discharge port and a film cover which does not have the bending guide grooves according to the present invention. 
         FIG. 16  is a plan view of the film cover. 
         FIG. 17  is a sectional view of a printer unit. 
         FIG. 18  is a perspective view of the printer unit. 
         FIG. 19  is a plan view showing a state in which the film cover passes through the printer unit. 
         FIG. 20  is a plan view showing a state in which the film unit passes through the printer unit. 
         FIG. 21  is a sectional view showing a state in which the developer pod is crushed by a spreading roller pair. 
         FIG. 22A  is a sectional view showing an example of a shape of a distal end of a spreading control member. 
         FIG. 22B  is a sectional view showing an example of the shape of the distal end of the spreading control member. 
         FIG. 23A  is a sectional view showing an example of a shape of a distal end of a spreading control member according to the related art. 
         FIG. 23B  is a sectional view showing an example of the shape of the distal end of the spreading control member according to the related art. 
         FIG. 24  is a front view showing a spreading state of a developer in a case where a width of the spreading control member falls in a predetermined range. 
         FIG. 25  is a perspective view of an external appearance of a digital camera with a printer according to a second embodiment when viewed from a rear surface, a plane, and a right side surface. 
         FIG. 26  is a perspective view of the external appearance of the digital camera with a printer according to the second embodiment when viewed from a rear surface, a plane, and a left side surface. 
         FIG. 27  is a rear view of the digital camera with a printer according to the second embodiment. 
         FIG. 28  is a plan view of the digital camera with a printer according to the second embodiment. 
         FIG. 29  is a sectional view taken along line XXIX-XXIX of  FIG. 28 . 
         FIG. 30  is an exploded perspective view of film holding portions. 
         FIG. 31  is a perspective view of an external appearance of a printer according to a third embodiment when viewed from a rear surface, a plane, and a right side surface. 
         FIG. 32  is a perspective view of the external appearance of the printer according to the third embodiment when viewed from a rear surface, a plane, and a left side surface. 
         FIG. 33  is a perspective view of the external appearance of the printer according to the third embodiment when viewed from a rear surface, a bottom surface, and a right side surface. 
         FIG. 34  is a perspective view of the external appearance of the printer according to the third embodiment when viewed from a rear surface, a bottom surface, and a left side surface. 
         FIG. 35  is a front view of the printer according to the third embodiment. 
         FIG. 36  is a rear view of the printer according to the third embodiment. 
         FIG. 37  is a plan view of the printer according to the third embodiment. 
         FIG. 38  is a bottom view of the printer according to the third embodiment. 
         FIG. 39  is a left side view of the printer according to the third embodiment. 
         FIG. 40  is a right side view of the printer according to the third embodiment. 
         FIG. 41  is a sectional view taken along line XLI-XLI of  FIG. 36 . 
         FIG. 42  is a sectional view taken along line XLII-XLII of  FIG. 36 . 
         FIG. 43  is a sectional view taken along line XLIII-XLIII of  FIG. 36 . 
         FIG. 44  is a perspective view of an external appearance of a printer according to a fourth embodiment when viewed from a rear surface, a plane, and a right side surface. 
         FIG. 45  is a perspective view of the external appearance of the printer according to the fourth embodiment when viewed from a rear surface, a plane, and a left side surface. 
         FIG. 46  is a rear view of the printer according to the fourth embodiment. 
         FIG. 47  is a sectional view taken along line XLVII-XLVII of  FIG. 46 . 
         FIG. 48  is a sectional view taken along line XLVIII-XLVIII of  FIG. 46 . 
         FIG. 49  is a sectional view taken along line XLIX-XLIX of  FIG. 46 . 
         FIG. 50  is a perspective view of an external appearance of a printer according to a fifth embodiment when viewed from a rear surface, a plane, and a right side surface. 
         FIG. 51  is a perspective view of the external appearance of the printer according to the fifth embodiment when viewed from a rear surface, a plane, and a left side surface. 
         FIG. 52  is a rear view of the printer according to the fifth embodiment. 
         FIG. 53  is a sectional view taken along line LIII-LIII of  FIG. 52 . 
         FIG. 54  is a sectional view taken along line LIV-LIV of  FIG. 52 . 
         FIG. 55  is a sectional view taken along line LV-LV of  FIG. 52 . 
         FIG. 56  is a perspective view of an external appearance of a printer according to a sixth embodiment when viewed from a rear surface, a plane, and a right side surface. 
         FIG. 57  is a perspective view of the external appearance of the printer according to the sixth embodiment when viewed from a rear surface, a plane, and a left side surface. 
         FIG. 58  is a rear view of the printer according to the sixth embodiment. 
         FIG. 59  is a plan view of the printer according to the sixth embodiment. 
         FIG. 60  is a left side view of the printer according to the sixth embodiment. 
         FIG. 61  is a right side view of the printer according to the sixth embodiment. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     First Embodiment 
     In  FIG. 1 , a digital camera  10  with a printer according to the present invention comprises a camera body  11 , an imaging unit  12 , and a printer unit  13 . An imaging window  15  and two release switches  16 A and  16 B are provided on a front surface of the camera body  11 . 
     As shown in  FIG. 2 , the camera body  11  has a substantially square shape in front view. A film unit  29  (see  FIG. 7 ) as a recording medium used in the digital camera  10  with a printer has a substantially square shape. 
     The imaging window  15  is disposed in the center on the front surface of the camera body  11 . The imaging window  15  exposes an imaging optical system  19  (see  FIG. 3 ) constituting the imaging unit  12 . 
     As shown in  FIG. 3 , the imaging optical system  19  and a solid-state imaging device  20  are provided in the imaging unit  12 . For example, the solid-state imaging device  20  is a complementary metal-oxide-semiconductor (CMOS) image sensor, and includes a light receiving surface constituted by a plurality of pixels (not shown) arranged in a two-dimensional matrix shape. Each pixel includes a photoelectric conversion element, photoelectrically converts a subject image formed on the light receiving surface by the imaging optical system  19 , and generates an imaging signal. 
     The solid-state imaging device  20  comprises signal processing circuits (all not shown) such as a noise removal circuit, an auto gain controller, and an A/D conversion circuit. The noise removal circuit performs a noise removal process on the imaging signal. The auto gain controller amplifies a level of the imaging signal to an optimum value. The A/D conversion circuit converts the imaging signal into a digital signal, and outputs the digital signal to a built-in memory (not shown) from the solid-state imaging device  20 . An output signal of the solid-state imaging device  20  is image data (so-called RAW data) having one color signal for each pixel. 
     The solid-state imaging device  20  is driven by pressing at least one of the release switch  16 A or  16 B, and the subject image is captured. 
     A film ejection port  22  is formed in a top surface of the camera body  11 . The film unit  29  on which an image is printed is ejected from the film ejection port  22 . 
     A loading cover  24  is attached to a rear surface of the camera body  11  through a hinge portion  24   c . The hinge portion  24   c  supports the loading cover  24  such that the loading cover can move rotationally between an opened position and a closed position. As represented by a dashed double-dotted line, the loading cover  24  opens a film pack room  25  within the camera body  11  in the opened position. As represented by a solid line, the loading cover  24  covers the film pack room  25  in the closed position. An instant film pack  26  is loaded within the film pack room  25 . A pair of press members  24   a  and  24   b  is formed on an inner surface of the loading cover  24 . 
     As shown in  FIG. 4 , a rear display unit  17  and an operation unit  18  are provided on an outer surface of the loading cover  24 , that is, a rear surface of the camera body  11 . The rear display unit  17  is, for example, a liquid crystal display (LCD) panel. Image data items corresponding one frame output from the solid-state imaging device  20  are sequentially input into the rear display unit  17 , and are displayed as a live preview image. 
     A photographer presses at least one of the release switch  16 A or  16 B, and thus, capturing is started. Image data items are acquired from the solid-state imaging device  20  through the capturing. An image processing unit (not shown) performs known image processing on the image data items, and then the image data items are compressed. Examples of the image processing include matrix operation, demosaicing, γ correction, brightness conversion, color difference conversion, and resizing. The image data items on which the image processing and compression are performed is recorded in a built-in memory (not shown) such as a flash memory provided within the camera body  11 . 
     In a case where a menu switch  18   a  of the operation unit  18  is pressed, the image is played and displayed on the rear display unit  17  based on the image data items recorded in the built-in memory. In a case where an image desired to be printed is displayed on the rear display unit  17 , the photographer presses a print switch  18   b  of the operation unit  18 , and a printing process using the printer unit  13  is started. 
     In  FIGS. 5 and 6 , the instant film pack  26  comprises a case  27 , a film unit press plate  28 , the film unit  29 , and a film cover  30 . 
     As shown in  FIG. 6 , the case  27  accommodates a plurality of film units  29  and one film cover  30  while the film units and the film cover are laminated. The case  27  is made of a material such as a thermoplastic resin or a paper resin acquired by mixing the thermoplastic resin with cellulose. The case  27  includes a box-shaped case member  31 , and a cover  32  that covers an opening formed in a rear surface of the case member  31 . 
     As shown in  FIG. 7 , an exposure opening  31   a  for exposing the film unit  29  is formed in the case member  31 . In the following description, a surface of the instant film pack  26  in which the exposure opening  31   a  is formed is a “front surface”, a surface opposite to the “front surface” is a “rear surface”, a surface facing the film ejection port  22  of the camera body  11  is a “top surface”, and a surface opposite to the “top surface” is a “bottom surface”. The film cover  30  is overlapped before the film unit  29  initially set in the exposure opening  31   a  within the case member  31 . Accordingly, the exposure opening  31   a  is lighttightly blocked by the film cover  30 . A cut-off portion  31   b  into which a known claw member  57  (see  FIGS. 17 and 18 ) formed at the camera is inserted is formed in a lower portion of the exposure opening  31   a.    
     A discharge port  31   c  is formed in a top surface of the case member  31 . The discharge port  31   c  is formed in a slit shape. The film units  29  or the film cover  30  are discharged one by one outwards from the instant film pack  26  by the claw member  57  inserted into the cut-off portion  31   b  of the case member  31  through the discharge port  31   c.    
     A light shielding seal  31   d  is pasted onto the case member  31  so as to close the discharge port  31   c  from the outside. The light shielding seal  31   d  is formed as a flexible sheet. The light shielding seal  31   d  is pasted onto one edge of a long side of the discharge port  31   c  so as not to hinder the film unit or the film cover in a case where the film unit  29  or the film cover  30  passes through the discharge port  31   c.    
     As shown in  FIG. 8 , in the case member  31 , a pair of light shielding grooves  31   e  is formed in positions corresponding to both sides of the exposure opening  31   a  and an inner wall surface facing the film cover  30 . A pair of outer light shielding ribs  30   c  of the film cover  30  to be described below is inserted into the pair of light shielding grooves  31   e.    
     As shown in  FIG. 7 , the cover  32  includes a pair of openings  32   a , a pair of unit support protrusions  32   b , a pair of caulking pins  32   c , and a support piece  32   d . The pair of openings  32   a  is formed so as to be vertically spaced apart from each other with a predetermined space, and is openings into which the press members  24   a  and  24   b  formed at the camera are inserted in a case where the instant film pack is loaded into the camera. 
     The pair of unit support protrusions  32   b  are formed at both side edge portions of the cover  32  so as to be vertically long, and each has an arc shape of which a center portion protrudes toward the exposure opening  31   a . The unit support protrusions  32   b  touch both side edge portions on a rear surface of the film unit  29  positioned in the last layer, and push up the film unit  29  by each having the arc shape of which the center portion protrudes toward the exposure opening  31   a . Accordingly, a gap between the film cover  30  and the exposure opening  31   a  is prevented from being formed. 
     The pair of caulking pins  32   c  is used for attaching the film unit press plate  28 . The support piece  32   d  supports the center portion of the film unit  29  positioned in the last layer from behind, and prevents the film unit  29  from being bent in which the center portion thereof is curved toward the cover  32 . 
     The film unit press plate  28  includes two elastic sheets  28   a  and  28   b  made of a synthetic resin. The sheet  28   a  is pressed by the press members  24   a  and  24   b  in a case where the loading cover  24  closes the film pack room, and is curved so as to protrude toward the cover  32 . An opening  28   c  and a pair of holes  28   d  are formed in the sheet  28   a . The opening  28   c  is formed in the center portion of the sheet  28   a  so as to be vertically long, and the support piece  32   d  is inserted into this opening. The pair of caulking pins  32   c  is inserted into the pair of holes  28   d , and the pair of holes is used for attaching the film unit press plate  28  to the cover  32 . 
     An opening  28   e  and a pair of holes  28   f  are formed in the sheet  28   b . The opening  28   e  is formed in the center portion of the sheet  28   b , and the support piece  32   d  is inserted into this opening. The pair of caulking pins  32   c  is inserted into the pair of holes  28   f . A lower end portion  28   h  of the sheet  28   b  is attached to a lower end portion  28   g  of the sheet  28   a . Accordingly, the sheet  28   b  prevents the sheet  28   a  from being slack, and prevents light leak from the pair of openings  32   a . The sheet  28   b  pushes up the film unit  29  in a substantially planar manner in a case where the sheet  28   a  is elastically bent by the press members  24   a  and  24   b . As a result, the film cover  30  positioned in the foremost layer or the film unit  29  is pressed rearwards on the front surface of the case member  31 . 
     As shown in  FIG. 9 , the film unit  29  includes a mask sheet  33 , a photosensitive sheet  34 , a cover sheet  35 , a developer pod  36 , and a trap portion  37 , and is a so-called mono-sheet type film. The mask sheet  33  is formed as a sheet made of a thin synthetic resin, and includes a screen opening  33   a . A photosensitive layer, a diffusion reflective layer, and an image reception layer are formed in the photosensitive sheet  34 . The cover sheet  35  includes an exposure surface  29   a  facing an exposure head  51  to be described below. 
     The developer pod  36  is formed in a substantially bag shape, and contains a developer  38  therein. The developer pod  36  is pasted onto an end portion of the photosensitive sheet  34  close to the discharge port  31   c , and is wrapped by an end portion of the mask sheet  33 . Both ends of the developer pod  36  are spaced apart from both ends of the film unit  29  with predetermined spaces in a width direction of the exposure surface  29   a.    
     As shown in  FIG. 10 , a width W 1  of the developer pod  36  is equal to a width W 2  of the exposure surface  29   a . In this example, a case where the widths are equal to each other includes a case where the widths are substantially equal to each other. Portions of the film unit  29  which are positioned outside both ends of the developer pod  36  in the width direction of the exposure surface  29   a  are side edge portions  29   b . As shown in  FIG. 9 , the trap portion  37  is pasted onto an end portion of the photosensitive sheet  34  opposite to the discharge port  31   c , and is similarly wrapped by the end portion of the mask sheet  33 . 
     As will be described in detail later, the film unit  29  irradiates the photosensitive layer with a print light at the time of printing, and thus, the photosensitive layer is exposed. The developer pod  36  is torn at the time of development, and the developer  38  flows and is spread into a gap  39  between the photosensitive sheet  34  and the cover sheet  35 . An image acquired through the exposure of the photosensitive layer is reversed by the diffusion reflective layer, and is transferred to the image reception layer. By doing this, a positive image appears on a positive image observation surface  40  of the photosensitive sheet  34  exposed through the screen opening  33   a.    
     As shown in  FIG. 11 , the developer pod  36  is formed by using a packaging material  44 , and contains the developer  38  (see  FIG. 9 ). The packaging material  44  is acquired by pasting aluminum foil into a paper support and applying an adhesive to the aluminum foil pasted onto the paper support. As depicted by mosaic hatching in the diagram, middle seals  46  to  48  are formed near the center of the developer pod  36 . As depicted by hatching in the diagram, a weak seal  49  is formed in an outlet portion through which the developer  38  leaks. The outlet portion that is pasted by the weak seal  49  is pasted with adhesive strength weaker than those of the middle seals  46  to  48 . 
     The middle seals  46  and  47  paste positions in which the developer pod  36  is divided into three in the width direction of the film unit  29  and which are close to the outlet of the developer  38 . The middle seals  48  paste a position which is the center in the width direction of the film unit  29  and is opposite to the outlet of the developer  38 . 
     The middle seals  46  to  48  have a function of controlling the spreading of the developer  38 . Specifically, the middle seals  46  to  48  spread the developer  38  into the gap  39  (see  FIG. 9 ) from the developer pod  36  as depicted by a dashed line of  FIG. 10  in a case where the weak seal  49  is broken through crushing using a spreading roller pair  54  to be described below and the developer  38  leaks from the outlet portion in three divided positions. 
     As shown in  FIGS. 12 and 13 , the film cover  30  is formed as a sheet thinner than the film unit  29 , and has light shielding properties and flexibility. The film cover  30  is a molded item made of a synthetic resin, and is made, for example, of polystyrene containing carbon black. 
     The film cover  30  comprises a cover member  30   a , a pair of accompanying prevention ribs  30   b , a pair of outer light shielding ribs  30   c , a pair of inner light shielding ribs  30   d , a light shielding film  30   e , and bending guide grooves  30   g  as bending guide portions. 
     The accompanying prevention ribs  30   b , the outer light shielding ribs  30   c , the inner light shielding ribs  30   d , and the bending guide grooves  30   g  as the bending guide portions are integrally formed on a front surface of the cover member  30   a  facing the exposure opening  31   a  (see  FIG. 7 ). The outer light shielding ribs  30   c  and the inner light shielding ribs  30   d  are positioned closer to proximal ends than the accompanying prevention ribs  30   b  in a discharge direction in a case where the film cover  30  is discharged through the discharge port  31   c . The light shielding film  30   e  is pasted onto a rear surface of the cover member  30   a.    
     The cover member  30   a  has a width enough to close at least the exposure opening  31   a , and the width is 72.2 mm in the present embodiment. 
     The accompanying prevention ribs  30   b  are arranged in parallel with a discharge direction from a distal end of the film cover  30  in the discharge direction. The accompanying prevention ribs  30   b  prevent the film unit  29  positioned in the next layer from being discharged together in a case where the film cover  30  is discharged through the discharge port  31   c . Thus, the accompanying prevention ribs  30   b  are formed so as to protrude from positions which are the distal end portion on the front surface of the cover member  30   a  facing the exposure opening  31   a  and are both side edge portions with a height equal to the gap of the discharge port  31   c , and prevent the film unit  29  positioned in the topmost layer from being ejected. A case where the height is equal to the gap of the discharge port  31   c  includes a case where the height of the accompanying prevention ribs  30   b  is substantially equal to the gap. 
     As shown in  FIGS. 13 and 14 , a tilt surface  41  of which a protruding height gradually decreases toward the distal end from the proximal end of the cover member  30   a  is formed at each accompanying prevention rib  30   b . It preferable that the tilt surface  41  has a tilt angle α of 7° to 30° (which is equal to greater than 7° and is equal to or less than 30°, and “˜” includes an upper limit and a lower limit in the following description) with respect to the cover member  30   a . The tilt angle α is set in the above-described range, and thus, the distal end of the film cover  30  can smoothly pass without rapidly increasing a load of a motor that rotates the spreading roller pair  54  in a case where the distal end of the film cover  30  passes between the spreading roller pair (see  FIG. 17 )  54 . 
     As shown in  FIG. 14 , the bending guide groove  30   g  guides bending so as to tilt a portion (hereinafter, side edge portion)  30   f  which is at the distal end portion of the film cover  30  and is on the outside of the accompanying prevention rib  30   b  in the protruding direction (arrow A 1 ) of the accompanying prevention rib  30   b . The bending guide groove  30   g  having an arc-shaped cross section is formed on the outside of the accompanying prevention rib  30   b  in a width direction of the cover member  30   a  along the accompanying prevention rib  30   b.    
     The sectional shape of the bending guide groove  30   g  is not particularly limited, and may be a triangle shape, a square shape, and other sectional shapes in addition to an arc shape. The bending guide groove  30   g  may be continuously formed along the accompanying prevention rib  30   b , and may also be intermittently formed along the accompanying prevention rib  30   b . The bending guide groove  30   g  is formed so as to be close to the accompanying prevention rib  30   b , but may be formed, for example, in a surface opposite to the accompanying prevention rib  30   b  although not shown. In this case, the bending guide groove may guide bending so as to tilt the side edge portion  30   f  outside the accompanying prevention rib  30   b  in the protruding direction of the accompanying prevention rib  30   b  by using the groove. 
       FIGS. 15A and 15B  are diagrams for describing an ejection effect of the film cover  30  through the discharge port  31   c  using the bending guide grooves  30   g , and show the relationship between a distortion state of film covers  30  and  201  and the discharge port  31   c .  FIG. 15A  shows the film cover  30  which includes the bending guide groove  30   g  according to the present invention, and  FIG. 15B  shows a film cover  201  of the related art which does not include the bending guide grooves  30   g.    
     The exposure surface  29   a  of the instant film pack  26  having the square size according to the present invention has an area greater than that of the instant film pack according to the related art. Thus, a distortion amount at which the center portion of the film cover protrudes in a spherical shape is also large at the time of molding the film cover  30 . In addition, as shown in  FIG. 15B , the film cover  201  is pressed through the pressing using the press members  24   a  and  24   b  within the instant film pack  26  such that the center portion thereof is strongly pressed and both side edge portions  30   f  thereof are weakly pressed as represented by an arrow. Accordingly, in a case of the film cover  201  according to the related art on which the bending guide grooves  30   g  are not formed as shown in  FIG. 15B , since the both side edge portions  30   f  of the cover member  30   a  are stopped by the discharge port  31   c , there is a concern that an error will occur in the discharge of the film cover  30 . In contrast, in the film cover  30  according to the embodiment of the present invention having the bending guide grooves  30   g  as shown in  FIG. 15A , the both side edge portions  30   f  are bent in a direction in which a bending deformation at the time of molding the film cover is relaxed by the bending guide grooves  30   g . Thus, the both side edge portions  30   f  are not stopped by the discharge port  31   c , and thus, the film cover  30  can be smoothly ejected through the discharge port  31   c.    
     As shown in  FIG. 16 , the pair of outer light shielding ribs  30   c  is arranged in parallel with each other in a width direction perpendicular to the discharge direction of the film cover  30 , and extends in a narrow strip shape along the discharge direction. 
     The outer light shielding ribs  30   c  are formed so as to be spaced apart from one end in the width direction of the film cover  30  with a predetermined space. Portions ranging from an edge of the film cover  30  in the width direction to outer edges  42  of the outer light shielding ribs  30   c  are the side edge portions  30   f  of the film cover  30 . The both side edge portions  30   f  of the film cover  30  face the both side edge portions  29   b  of the film unit  29 , and do not face portions of the film unit which are positioned inside the both side edge portions  29   b . Accordingly, in a case where the film unit  29  is transported by a capstan roller  61  to be described below, only the both side edge portions  29   b  of the film unit  29  are pinched, and the developer pod  36  is prevented from being crushed. Widths D 1  of the both side edge portions  30   f  are 2.3 mm in the present embodiment. 
     A second distance L 2  which is a space between the outer edges  42  of the pair of outer light shielding ribs  30   c  is 67.6 mm in the present embodiment. The outer edges  42  of the outer light shielding rib  30   c  is an edge positioned outside in the width direction of the film cover  30 . 
     The pair of inner light shielding ribs  30   d  is positioned inside the pair of outer light shielding ribs  30   c  in the width direction of the film cover  30 . The pair of inner light shielding ribs  30   d  is arranged in parallel with each other, and extends in a narrow strip shape along the discharge direction. The pair of inner light shielding ribs  30   d  faces both side edges of the exposure opening  31   a.    
     As shown in  FIG. 8 , in a state in which the instant film pack  26  is accommodated in the case member  31 , the outer light shielding ribs  30   c  are inserted into the light shielding grooves  31   e , and the inner light shielding ribs  30   d  are positioned near both the side edges of the exposure opening  31   a . Accordingly, a labyrinth structure is built by the light shielding grooves  31   e , the outer light shielding ribs  30   c , and the inner light shielding ribs  30   d . Due to the labyrinth structure, even in a case where the film cover  30  is deformed in a thickness direction and the gap between the film cover  30  and the exposure opening  31   a  is formed, external light is prevented from being incident within the instant film pack  26  through the gap. In  FIG. 8 , the film unit  29  is not shown for simplicity of illustration. 
     As shown in  FIG. 16 , the light shielding film  30   e  is provided at a lower end of the cover member  30   a  with which the claw member  57  (see  FIG. 17 ) engages. The light shielding film  30   e  is formed in a striped shape, and is pasted onto such that a part  43  thereof protrudes from the lower end of the cover member  30   a . The protruding part  43  is bent in an L shape toward the front surface of the cover member  30   a . A width of at least the part  43  of the light shielding film  30   e  is greater than a width of the cut-off portion  31   b  formed on the case member  31 . The cut-off portion  31   b  is blocked from the inside by the part  43  of the light shielding film  30   e , external light is prevented from being incident within the instant film pack  26  through the cut-off portion  31   b.    
     Although not shown, a distal-end light shielding flap made of a synthetic resin film having light shielding properties is attached to the center portion of the upper end of the cover member  30   a . The distal-end light shielding flap is bent toward the film unit  29 , and blocks the center portion of the discharge port  31   c  within the case  27 . Accordingly, the film cover  30  or the film unit  29  is prevented from being blown away through the discharge port  31   c  due to impact in a case where the instant film pack  26  fell onto the floor. 
     As shown in  FIGS. 17 and 18 , the printer unit  13  includes the exposure head  51  and a developer spreading device  52 . For example, the exposure head  51  includes a light source, a liquid crystal shutter, and a lens. 
     The exposure head  51  is disposed in a position facing a transport path of the film unit on an upstream side of the developer spreading device  52  in a transport direction of the film unit. The exposure head  51  irradiates the exposure surface  29   a  with line-shaped print light parallel to the width direction of the film unit  29 . 
     The developer spreading device  52  includes a transport roller pair  53 , the spreading roller pair  54 , a spreading control member  56 , a film pack room  25  (see  FIGS. 3 and 17 ), the claw member  57 , a claw member driving mechanism (not shown), and an ejection guide  58 . 
     The claw member  57  is inserted into the cut-off portion  31   b  of the case member  31  by the claw member driving mechanism, and presses the film cover  30  or the foremost film unit  29 . Accordingly, the film cover  30  or the foremost film unit  29  is discharged outwards from the instant film pack  26  through the discharge port  31   c.    
     The transport roller pair  53  and the spreading roller pair  54  are driven so as to be rotated by a motor (not shown), and transport the film cover  30  and the film unit  29  while pinching the film cover and the film unit. The transport roller pair  53  includes the capstan roller  61  and a pinch roller  62 . The capstan roller  61  and the pinch roller  62  are arranged in a position in which these rollers pinch a transport path of the film unit  29 . 
     The capstan roller  61  is disposed on a side (a left side of the transport path in the diagram) facing the exposure surface  29   a  of the film unit  29 . The capstan roller  61  includes a pair of cylindrical roller members  61   a  and a rotational shaft  61   b  that holds the roller members  61   a . A spike (not shown) including a plurality of small protrusions is formed on a circumferential surface of the roller member  61   a.    
     As shown in  FIGS. 19 and 20 , a first distance L 1  which is a space between inner side edges  61   c  of the pair of roller members  61   a  is longer than the second distance L 2 . The holding force of the transport roller pair  53  that holds the film cover  30  is improved. Since a holding area of the transport roller pair  53  that holds the film cover  30  increases, a frictional force occurring between the transport roller pair and the film cover  30  also increases. Thus, it is possible to transport the film unit with a sufficient holding force even with low torque. The inner side edges  61   c  of the pair of roller members  61   a  are edges positioned on the inside in an axial direction of the rotational shaft  61   b.    
     As shown in  FIG. 20 , the pair of roller members  61   a  is arranged in a position in which the pair of roller members is in slidingly contact with the both side edge portions  29   b  of the film unit  29 . That is, the first distance L 1  which is a space between the inner side edges  61   c  of the transport roller pair  53  is longer than the width W 1  of the developer pod  36 . Accordingly, the transport roller pair  53  can transport the film unit without tearing the developer pod  36  of the film unit  29 . 
     As shown in  FIG. 21 , the pinch roller  62  is disposed on a side (a right side of the transport path in the diagram) facing the positive image observation surface  40  of the film unit  29 . The pinch roller  62  includes a roller member  62   a  and a rotational shaft  62   b . Both end portions of the roller member  62   a  are pressed toward the capstan roller  61  by springs  66  as press mechanisms. 
     The transport roller pair  53  transports the film unit toward the spreading roller pair  54  while pinching the both side edge portions  29   b  of the film unit  29  discharged from the instant film pack  26  by the claw member  57 . An exposure position P (see  FIG. 17 ) in which the exposure head  51  exposes the film unit  29  with print light is positioned between the discharge port  31   c  of the instant film pack  26  and the transport roller pair  53 . The exposure using the exposure head  51  is performed for a period during which the film unit is transmitted by the transport roller pair  53 . 
     The exposure is started based on output signals from a detection sensor (not shown) that detects the passing of the distal end portion of the film unit  29  and a rotation speed detection sensor that detects a rotation speed of the capstan roller  61 . Initially, the passing of the distal end portion is detected by the distal-end-portion passing detection sensor. The detection of the rotation speed is started by the rotation speed detection sensor based on the detection signal. In a case where the rotation speed reaches a predetermined value, the detection sensor detects that the exposure surface  29   a  of the film unit  29  is transported to a position facing the exposure head  51 . Accordingly, the exposure using the exposure head  51  is started. 
     The exposure is performed by sequentially exposing line images on the film unit  29  by the exposure head  51  while moving the film unit  29  for each line. Accordingly, an image corresponding to a single screen is exposed on the photosensitive layer of the film unit  29 . The film unit  29  is subsequently transported toward the spreading roller pair  54  by the transport roller pair  53 . 
     The spreading roller pair  54  includes spreading rollers  63  and  64 , and is arranged on a downstream side of the transport roller pair  53  in the transport direction. The spreading roller  63  is disposed on the side (the left side of the transport path in the diagram) facing the exposure surface  29   a  of the film unit  29 . The spreading roller  64  is disposed on the side (the right side of the transport path in the diagram) facing the image observation surface of the film unit  29 . Both end portions of the spreading roller  64  are pressed toward the spreading roller  63  by springs  67  as press mechanisms. 
     Although not shown, driving gears are attached to one-side shaft end portions of the spreading rollers  63  and  64 , and both the driving gears mesh each other. The motor is connected to one of the driving gears through an intermediate gear. Thus, in a case where the motor rotates, the spreading rollers  63  and  64  are rotated in synchronization with the motor. 
     The spreading roller pair  54  transports the film unit  29  transported by the transport roller pair  53  toward the ejection guide  58  while pinching the film unit over the entire width. The film unit is pinched by the spreading roller pair  54 , and thus, the developer pod  36  of the film unit  29  is crushed. Accordingly, the developer is spread into the gap  39  (see  FIG. 8 ). The film unit  29  delivered from the spreading roller pair  54  is transported toward the ejection guide  58 . 
     The spreading control member  56  is provided between the transport roller pair  53  and the spreading roller pair  54 . The spreading control member  56  touches the positive image observation surface  40  of the transported film unit  29 , and controls the distribution of the spreading developer by rubbing the positive image observation surface  40  of the film unit  29 . The spreading control member  56  is disposed in a position in which a space between the transport roller pair  53  and the spreading roller pair  54  is substantially divided into two. Thus, the spreading control member  56  can control the developer spread into the gap  39  of the film unit  29  in the transport direction of the film unit  29 . 
     The spreading control member  56  extends in a direction which is in parallel with the width direction of the film unit  29  being transported and is perpendicular to the transport direction of the film unit  29 . The spreading control member  56  is formed integrally with a plate-shaped support member  56   a , and is fixed to the camera body  11  through the support member  56   a.    
     A distal end of the spreading control member  56  protrudes toward the film unit  29  from a pinching position in which the spreading roller pair  54  pinches the film unit  29  on a cross-section which is perpendicular to the exposure surface  29   a  of the film unit  29  being transported and is in parallel with the transport direction. Specifically, the spreading control member  56  is formed in a mountain shape of which a dimension in the transport direction gradually decreases toward the film unit  29 . Accordingly, the spreading control member  56  can reliably rub the positive image observation surface  40  of the film unit  29 . 
     As shown in  FIG. 22A , the distal end of the spreading control member  56 , that is, an end surface  56   b  at a top of the mountain shape is formed in a convex shape of which the center portion protrudes toward the film unit  29  on a cross-section of the film unit  29  in the width direction. Specifically, the end surface  56   b  is formed such that the center portion protrudes from distal ends of both side edges of the spreading control member  56  on the cross-section of the film unit  29  by 0.01 mm to 0.5 mm in the width direction.  FIG. 22A  shows a dimension in a thickness direction (a protruding direction of the spreading control member  56 ) with respect to a width direction of the spreading control member  56  for the sake of convenience in the description. 
     Since most components of the camera body  11  including the spreading control member  56  are molded items made of a synthetic resin, the components are distorted in some cases. Particularly, both ends of the spreading control member  56  are distorted toward the film unit  29  in many cases as shown in  FIG. 22B . However, since the spreading control member  56  is formed in the convex shape of which the center portion of the distal end protrudes toward the film unit  29  as described above, the spreading control member can press the film unit  29  with an equal pressing force in the width direction of the film unit  29 . Accordingly, it is possible to control the developer  38  spread into the gap  39  of the film unit  29  over the width direction of the film unit  29 . The developer  38  is spread into the gap  39  from the developer pod  36  in three divided positions, and the spreading control member  56  touches the film unit  29  with the equal pressing force. Thus, the developer  38  can be more equally spread in the width direction of the film unit  29 . 
     Meanwhile, as shown in  FIG. 23A , an end surface  69   a  on a distal end of a spreading control member  69  according to the related art is formed in a flat shape. Thus, in a case where both ends of the spreading control member  69  are distorted toward the film unit  29  as shown in  FIG. 23B , a pressure of the center portion against the film unit  29  is weak, and thus, the developer more easily flows in the center portion than both the end portions. Accordingly, since the developer does not reach four corners of the exposure surface  29   a , development unevenness is caused. As stated above, the spreading control member  56  according to the present invention is formed in the convex shape of which the center portion of the distal end protrudes, the center portion and both the end portions can equally press the film unit  29 . 
     As shown in  FIG. 24 , a width W 3  of the spreading control member  56  is less than the width W 2  of the exposure surface  29   a . Specifically, the width W 3  of the spreading control member  56  is 70% to 95% of the width W 2  of the exposure surface  29   a . The width of the spreading control member  56  mentioned in this example is a width of the end surface  56   b  that controls the spreading of the developer by rubbing the positive image observation surface  40  of the film unit  29 . The width W 3  of the spreading control member  56  is less than the width W 2  of the exposure surface  29   a , and thus, the developer easily flows around the outside of the spreading control member  56  in the width direction of the exposure surface  29   a . Accordingly, the developer is equally spread over the entire width of the exposure surface  29   a . As described above, since the developer  38  is spread into the gap  39  of the film unit  29  by the spreading roller pair  54  and the distribution of the developer  38  is controlled in the transport direction by the spreading control member  56 , the developer is equally spread to the four corners of the exposure surface  29   a . Accordingly, it is possible to prevent the development unevenness of the film unit  29 . 
     As shown in  FIG. 21 , the ejection guide  58  includes a guide passage  68  that guides the distal end portion of the film unit  29  delivered from the spreading roller pair  54  towards the film ejection port  22 . The ejection guide  58  is formed separately from the camera body  11 , and is fixed to the camera body  11  through a support member (not shown). One guide surface of the guide passage  68  is a tilt surface  68   a . A tilt angle β of the tilt surface  68   a  with respect to a proximal end surface  68   b  preferably ranges from 15° to 55°, and particularly preferably 25° to 45°. The tilt angle β is set in this range, and thus, the both side edge portions  30   f  of the film cover  30  are not stopped by an end surface  58   a  of the ejection guide  58  in a case where the distal end of the film cover  30  passes through the ejection guide  58 . Accordingly, it is possible to eliminate the ejection error of the film cover  30 . A development treatment is ended, and the film unit  29  delivered into the guide passage  68  by the spreading roller pair  54  is transported to the film ejection port  22  along the guide passage  68 , and is ejected to the outside of the camera body  11 . 
     As mentioned above, the distal end portion of the spreading control member  56  protrudes toward the film unit  29  from the pinching position in which the spreading roller pair  54  pinches the film unit  29 . Thus, the film unit  29  is in contact with the spreading roller pair  54 , the spreading control member  56 , and the guide passage  68  of the ejection guide  58 . Accordingly, the film unit  29  is curved in a gentle S shape. As a result, a sliding contact force of the film unit  29  and the spreading control member  56  increases, and the developer  38  is more effectively spread by the spreading control member  56 . 
     In a case where the film cover  30  passes through the spreading roller pair  54 , the spherical distortion of the film cover  30  is corrected through the pinching performed by the spreading roller pair  54 . Since the both side edge portions  30   f  of the cover member  30   a  is further bent by the bending guide grooves  30   g  at the time of correction, the distal ends of the both side edge portions  30   f  are not stopped by an end surface  58   a  of the ejection guide  58 , and the film cover  30  can be smoothly ejected. 
     Second Embodiment 
     In a second embodiment, film holding portions are formed in the loading cover, and position alignment protrusion portions and reversal loading prevention cut-off portions are formed at the film pack room. In the second embodiment, the exterior shape of the digital camera with a printer is the same as the front surface, the rear surface, the side surfaces, the planes, and the bottom surface of the digital camera with a printer according to the first embodiment, and the internal shapes of the loading cover and the film pack room are different from those of the digital camera with a printer according to the first embodiment. The same components as those used in the first embodiment will be assigned the same references, and thus, the description thereof will be omitted. 
     As shown in  FIGS. 25 to 28 , a digital camera  80  with a printer comprises a camera body  81 . Although not shown, the digital camera  80  with a printer comprises the imaging unit  12  and the printer unit  13  which are the same as those of the digital camera  10  with a printer according to the first embodiment. 
     A loading cover  82  is attached to a rear surface of the camera body  81  through a hinge portion  82   c . The hinge portion  82   c  supports the loading cover  82  such that the loading cover can move rotationally between an opened position and a closed position. The loading cover  82  opens a film pack room  83  within the camera body  81  in the opened position. The loading cover  82  covers the film pack room  83  in the closed position. The same instant film pack  26  as that of the first embodiment is loaded into the film pack room  83 . 
     Position alignment protrusion portions  84   a  to  84   c  are formed on both side surfaces of the film pack room  83 . The position alignment protrusion portions  84   a  to  84   c  are formed in wedge shapes of which a thickness gradually increases along a loading direction of the instant film pack  26 , and prevent the instant film pack  26  from being loaded in a reverse direction. 
     The reversal loading prevention cut-off portions  85   a  and  85   b  are formed on both side surfaces of the film pack room  83 . Each of the reversal loading prevention cut-off portions  85   a  and  85   b  are formed in L shapes. The reversal loading prevention cut-off portions  85   a  and  85   b  engage with protrusion portions  26   a  (see  FIG. 5 ) formed on both side surfaces of the instant film pack  26 , and thus, the reversal loading prevention cut-off portions together with the position alignment protrusion portions  84   a  to  84   c  prevent the instant film pack  26  from being loaded in the reverse direction. 
     A cut-off portion  87  is formed in the film pack room  83  in a position facing the cut-off portion  31   b  of the instant film pack  26 . The cut-off portion  87  is continuously formed up to a bottom surface of the film pack room  83 . The claw member  57  formed in the camera body  81  passes through the cut-off portion  87  and enters the inside of the instant film pack  26 , and the film units  29  are discharged to the outside of the instant film pack  26  one by one. 
     A pair of film holding portions  82   a  and  82   b  is formed on the inner surface of the loading cover  82 . Similarly to the press members  24   a  and  24   b  according to the first embodiment, in a case where the instant film pack  26  is loaded into the film pack room  83  and the loading cover  82  is positioned in the closed position, the film holding portions  82   a  and  82   b  pass through the openings  32   a , are inserted into the instant film pack  26 , and press the film unit press plate  28 . Accordingly, the film unit  29  within the instant film pack  26  is pressed in a laminated direction. 
     As shown in  FIG. 29 , the film holding portion  82   a  includes a pair of press members  88 , a holding frame  89 , and springs  91 . The holding frame  89  holds the press members  88 , and is fixed to an inner wall surface of the loading cover  82 . The film holding portion  82   b  has the same configuration as that of the film holding portion  82   a.    
     As shown in  FIG. 30 , a press surface  88   a  is formed at one end portion of the press member  88 . The press surface  88   a  is formed in a smooth curved surface shape. A rotational shaft  88   b  is formed at the other end portion of the press member  88 . An engagement hole  89   a  is formed in the holding frame  89 . The rotational shaft  88   b  engages with the engagement hole  89   a  so as to move rotationally. 
     The pair of press members  88  faces each other such that the positions of the press surface  88   a  and the rotational shaft  88   b  are opposite to each other, and are held by the holding frame  89 . For example, the holding frame  89  is fixed to the loading cover  82  through screwing. 
     The springs  91  are torsion coil springs, and are attached between the press members  88  and the holding frame  89 . The springs  91  bias the press members  88  such that the press surfaces  88   a  move rotationally around the rotational shafts  88   b  upwards in the diagram. Accordingly, the press surfaces  88   a  press the film unit press plate  28 . 
     Third Embodiment 
     A third embodiment is acquired by applying the present invention to a printer. Similarly to the first and second embodiments, a printer according to the third embodiment and the subsequent embodiments is a printer in which the instant film pack  26  is loaded into the film pack room, the image data items are received from an electronic device such as a smartphone through wireless communication, and an image is printed on the film unit  29  based on the received image data items. The same components as those used in the embodiments will be assigned the same references, and thus, the description thereof will be omitted. 
     As shown in  FIGS. 31 to 40 , a printer  100  comprises a main body  101 . The printer unit  13  (not shown) which is the same as that of the first embodiment is provided at the main body  101 . A loading cover  102  is attached to a rear surface of the main body  101  through a hinge portion  102   c . The hinge portion  102   c  supports the loading cover  102  such that the loading cover can move rotationally between an opened position and a closed position. The loading cover  102  opens a film pack room  103  within the main body  101  in the opened position. The loading cover  102  covers the film pack room  103  in the closed position. The same instant film pack  26  as that of the first embodiment is loaded into the film pack room  103 . An operation button  101   a  is provided at the main body  101 . For example, the operation button  101   a  is a print switch for instructing that a printing process using the printer unit  13  is to be performed. 
     As shown in  FIGS. 41 to 43 , the film pack room  103  comprises a cut-off portion  104  and a rectangular frame  106 . The cut-off portion  104  is formed in a position facing the cut-off portion  31   b  of the instant film pack  26 , and is continuous with a bottom surface of the film pack room  103 . The claw member  57  formed in the main body  101  passes through the cut-off portion  104  and enters the inside of the instant film pack  26 , and the film units  29  are discharged to the outside of the instant film pack  26  one by one. The rectangular frame  106  is formed in a position facing the exposure opening  31   a  of the instant film pack  26 . 
     Fourth Embodiment 
     In a fourth embodiment, position alignment protrusion portions are formed at the film pack room. In the fourth embodiment, the exterior shape of the printer is the same as the front surface, the side surfaces, the plane, and the bottom surface of the printer according to the third embodiment, and the shape of the rear surface including the inside of the film pack room is different from that of the printer according to the third embodiment. The same components as those used in the embodiments will be assigned the same references, and thus, the description thereof will be omitted. 
     As shown in  FIGS. 44 to 46 , in a printer  110 , a pair of position alignment protrusion portions  111   a  and  111   b  are formed on both side surfaces of the film pack room  103 . As shown in  FIGS. 47 to 49 , the position alignment protrusion portions  111   a  and  111   b  are formed in the same wedge shape as those of the position alignment protrusion portions  84   a  to  84   c  according to the second embodiment, and prevent the instant film pack  26  from being loaded in a reverse direction. Although not shown, the cut-off portion  104  into which the claw member  57  is inserted and the rectangular frame  106  may also be formed at the film pack room  103  in the present embodiment. 
     Fifth Embodiment 
     In a fifth embodiment, reversal loading prevention cut-off portions and position alignment protrusion portions are formed at the film pack room. In the fifth embodiment, the exterior shape of the printer is the same as the front surface, the side surfaces, the plane, and the bottom surface of the printer according to the third embodiment, and the shape of the rear surface including the inside of the film pack room is different from that of the printer according to the third embodiment. The same components as those used in the embodiments will be assigned the same references, and thus, the description thereof will be omitted. 
     As shown in  FIGS. 50 to 52 , in a printer  120 , reversal loading prevention cut-off portions  121   a  and  121   b  are formed on both side surfaces of the film pack room  103 . As shown in  FIGS. 53 and 54 , the reversal loading prevention cut-off portions  121   a  and  121   b  are formed in L shapes. Similarly to the reversal loading prevention cut-off portions  85   a  and  85   b  according to the second embodiment, the reversal loading prevention cut-off portions  121   a  and  121   b  prevent the instant film pack  26  from being loaded in a reverse direction. 
     As shown in  FIGS. 53 to 55 , position alignment protrusion portions  122   a  to  122   c  are formed on both side surfaces of the film pack room  103 . The position alignment protrusion portions  122   a  to  122   c  are formed in the same wedge shape as those of the position alignment protrusion portions  84   a  to  84   c  according to the second embodiment, and prevent the instant film pack  26  from being loaded in a reverse direction. Although not shown, the cut-off portion  104  into which the claw member  57  is inserted and the rectangular frame  106  may also be formed at the film pack room  103  in the present embodiment. 
     Sixth Embodiment 
     In a sixth embodiment, reversal loading prevention cut-off portions and position alignment protrusion portions are formed at the film pack room. In the sixth embodiment, the exterior shape of the printer is the same as the front surface and the bottom surface of the printer according to the third embodiment, and the shapes of the rear surface, the side surfaces, and the plane including the inside of the loading cover are different from those of the printer according to the third embodiment. The same components as those used in the embodiments will be assigned the same references, and thus, the description thereof will be omitted. 
     As shown in  FIGS. 56 to 61 , in a printer  130 , a pair of film holding portions  102   a  and  102   b  is formed on an inner surface of the loading cover  102 . The film holding portions  102   a  and  102   b  have the same configurations as those of the film holding portions  82   a  and  82   b  according to the second embodiment. That is, in a case where the instant film pack  26  is loaded into the film pack room  103  and the loading cover  24  is positioned in the closed position, the film holding portions  102   a  and  102   b  pass through the opening  32   a , are inserted into the instant film pack  26 , and press the film unit press plate  28 . Accordingly, the film unit  29  within the instant film pack  26  is pressed in a laminated direction. Although not shown, the cut-off portion  104  into which the claw member  57  is inserted, the rectangular frame  106 , the reversal loading prevention cut-off portions, and the position alignment protrusion portions may also be formed at the film pack room  103  in the present embodiment. 
     EXPLANATION OF REFERENCES 
     
         
         
           
               10 : digital camera with printer 
               11 : camera body 
               12 : imaging unit 
               13 : printer unit 
               15 : imaging window 
               16 A: release switch 
               16 B: release switch 
               17 : rear display unit 
               18 : operation unit 
               18   a : menu switch 
               18   b : print switch 
               19 : imaging optical system 
               20 : solid-state imaging device 
               22 : film ejection port 
               24 : loading cover 
               24   a ,  24   b : press member 
               24   c : hinge portion 
               25 : film pack room 
               26 : instant film pack 
               26   a : protrusion portion 
               27 : case 
               28 : film unit press plate 
               28   a ,  28   b : sheet 
               28   c ,  28   e : opening 
               28   d ,  28   f : hole 
               28   g ,  28   h : lower end portion 
               29 : film unit 
               29   a : exposure surface 
               29   b : side edge portion 
               30 : film cover 
               30   a : cover member 
               30   b : accompanying prevention rib 
               30   c : outer light shielding rib 
               30   d : inner light shielding rib 
               30   e : light shielding film 
               30   f : side edge portion 
               30   g : bending guide groove (bending guide portion) 
               31 : case member 
               31   a : exposure opening 
               31   b : cut-off portion 
               31   c : discharge port 
               31   d : light shielding seal 
               31   e : light shielding groove 
               32 : cover 
               32   a : opening 
               32   b : unit support protrusion 
               32   c : caulking pin 
               32   d : support piece 
               33 : mask sheet 
               33   a : screen opening 
               34 : photosensitive sheet 
               35 : cover sheet 
               36 : developer pod 
               37 : trap portion 
               38 : developer 
               39 : gap 
               40 : positive image observation surface 
               41 : tilt surface 
               42 : outer edge 
               43 : part 
               44 : packaging material 
               46 ,  47 ,  48 : middle seal 
               49 : weak seal 
               51 : exposure head 
               52 : developer spreading device 
               53 : transport roller pair 
               54 : spreading roller pair 
               56 : spreading control member 
               56   a : support member 
               56   b : end surface 
               57 : claw member 
               58 : ejection guide 
               58   a : end surface 
               61 : capstan roller 
               61   a : roller member 
               61   b : rotational shaft 
               61   c : inner side edge 
               62 : pinch roller 
               62   a : roller member 
               62   b : rotational shaft 
               63 ,  64 : spreading roller 
               66 ,  67 : spring 
               68 : guide passage 
               68   a : tilt surface 
               68   b : proximal end surface 
               69 : spreading control member 
               69   a : end surface 
               80 : digital camera with printer 
               81 : camera body 
               82 : loading cover 
               82   a ,  82   b : film holding portion 
               82   c : hinge portion 
               83 : film pack room 
               84   a  to  84   c : position alignment protrusion portion 
               85   a ,  85   b : reversal loading prevention cut-off portion 
               87 : cut-off portion 
               88 : press member 
               88   a : press surface 
               88   b : rotational shaft 
               89 : holding frame 
               89   a : engagement hole 
               91 : spring 
               100 : printer 
               101 : main body 
               101   a : operation button 
               102 : loading cover 
               102   a ,  102   b : film holding portion 
               102   c : hinge portion 
               103 : film pack room 
               104 : cut-off portion 
               106 : frame 
               110 : printer 
               111   a ,  111   b : position alignment protrusion portion 
               120 : printer 
               121   a ,  121   b : reversal loading prevention cut-off portion 
               122   a  to  122   c : position alignment protrusion portion 
               130 : printer 
               201 : film cover 
             A 1 : arrow 
             D 1 : width of both side edge portions 
             L 1 : first distance 
             L 2 : second distance 
             P: exposure position 
             W 1 : width of developer pod 
             W 2 : width of exposure surface 
             W 3 : width of spreading control member 
             α: tilt angle with respect to cover member of tilt surface of accompanying prevention ribs 
             β: tilt angle with respect to proximal end surface of tilt surface of guide passage