Abstract:
A camera includes a lens barrel capable of extending and collapsing in which when the lens barrel is extended, exposures are possible. The camera includes an aperture member in which any one of a plurality of aperture values can be selected, an aperture set up handler varying a position based on the aperture value, and a coupling member for mechanically coupling the aperture member with the aperture set up handler to transmit the position of the aperture set up handler to the aperture member so that said aperture member is set up to an aperture value according to the position of the aperture set up handler. The aperture member returns to an original setting when the lens barrel is collapsed. The aperture set up handler returns to a position to set up the aperture member to the original setting in accordance with the collapse operation of the lens barrel.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a camera having a function of setting up an aperture value. 
     2. Description of the Related Art 
     Hitherto, there are known many types of cameras provided with various functions in order that anyone takes a beautiful photograph in a simple way. 
     Of such types of cameras, there are known cameras each having a function in which when a camera is brought in an operative state, a main power source switch is turned on, and when the camera is brought in an inoperative state, the main power source switch is turned off, and in addition, as in a camera disclosed in Japanese Utility Model Application Laid Open Gazette Hei. 7-1431, a function in which an aperture value is electrically automatically set up before photography and after photography the aperture value is electrically automatically returned to a predetermined aperture value. 
     However, appending the functions of electrically controlling the aperture value, as disclosed in Japanese Utility Model Application Laid Open Gazette Hei. 7-1431, involves a rise of the manufacturing cost of the camera. 
     Thus, there is considered, as a camera capable of taking a beautiful photography in a simple way even if anyone operates such a camera, suppressing the cost up, a camera that appends a function of manually setting up an aperture value. 
     However, in such a camera, there is a possibility that a user forgets setting up of an aperture value and takes photography, and thereby involving a failure of photography. 
     SUMMARY OF THE INVENTION 
     In view of the foregoing, it is an object of the present invention to provide a camera reducing a failure of photography due to user&#39;s forgetting of setting up of an aperture value, and also implementing reduction of the cost of the camera. 
     To achieve the above-mentioned objects, the present invention provides a camera having a lens barrel capable of extending and collapsing in which when the lens barrel is extended, a photography is available, said camera comprising: 
     an aperture member in which any one of a plurality of aperture values is set up in accordance with a mechanical force; 
     an aperture set up handler varying a position or a posture in accordance with a set up operation for an aperture value; and 
     a coupling member for mechanically coupling said aperture member with said aperture set up handler to transmit the position or the posture according to the set up operation for the aperture value by said aperture set up handler to said aperture member so that said aperture member is set up to an aperture value according to a position or a posture after the set up operation of said aperture set up handler, 
     wherein said aperture member returns to an aperture value of a predetermined opening in accordance with a collapse operation of said lens barrel, and 
     said aperture set up handler returns to a position or a posture to set up said aperture member to the aperture value of the predetermined opening in accordance with the collapse operation of said lens barrel. 
     According to the camera of the present invention, the aperture value is set up by a user&#39;s operation. Thus, as compared with a camera in which an aperture value is automatically set up, it is possible to reduce the price f the camera. Further, according to the camera of the present invention, while the aperture value is set up by a user&#39;s operation, the aperture member returns to the aperture value of a predetermined opening by the collapse operation of the lens barrel. Thus, when the aperture value of high frequency in the use is selected to the aperture value of the predetermined opening, it is possible to reduce troublesomeness of the set up operation for the aperture value by a user at the time of the subsequent photography, and further it is possible to reduce a possibility of a failure of the photography due to the user&#39;s forgetting of setting up of the aperture value. Further according to the camera of the present invention, when the aperture member returns to the aperture value of the predetermined opening, the collapse operation of the lens barrel is utilized. This feature makes it possible to prevent the aperture value from being inadvertently set up to the aperture value of the predetermined opening. 
     In the camera according to the present invention as mentioned above, it is preferable that said aperture member is enabled in a direction to be set up to the aperture value of the predetermined opening of the plurality of aperture values, and 
     said camera further comprises a click lever in which in an extension state of said lens barrel, even when said aperture member is set up to any one of the plurality of aperture values, said click is engaged with said aperture member to maintain the aperture value thus set up, and as said lens barrel transfers in a state from the extension state to a collapse state, said click lever at least temporarily releases an engagement with said aperture member to transfer said aperture member to the aperture value of the predetermined opening by an enabling force. 
     The use of the click lever makes it possible at the time of photography to prevent the aperture value from being inadvertently varied, and further makes it possible at the time of collapse of the lens barrel that the aperture value is reliably returned to the aperture value of the predetermined opening. 
     Further, in the camera according to the present invention as mentioned above, it is preferable that said camera further comprises a photometry section for measuring brightness of field, and 
     an instruction section for instructing a position or a posture of said aperture set up handler to set up said aperture member to an aperture value according to the brightness of field obtained through measurement by said photometry section. 
     Making provision of the instruction section makes it possible to guide a user as to the operation of the aperture set up handler and whereby the user can easily set up the aperture value. 
     In the camera as mentioned above, it is acceptable that said instruction section has a plurality of light-emitting devices disposed at positions according to the position or the posture of said aperture set up handler. 
     Further in the camera as mentioned above, it is acceptable that each of said plurality of light-emitting devices emits a plurality of lights. 
     In the camera according to the present invention as mentioned above, it is preferable that said lens barrel is manually extended and collapsed. 
     Adoption of the lens barrel as mentioned above needs no driving mechanism for driving the lens barrel and thus it is possible to implement further reduction of the price of the camera. 
     In the camera according to the present invention as mentioned above, it is preferable that said camera further comprises a main power switch, which turns on when the lens barrel is extended, and turns off when the lens barrel is collapsed. 
     Making provision of the main power switch makes it possible to simplify the operation of the camera and also makes it possible to prevent the useless consumption of power of the battery due to forgetting turning off the main power switch. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective front view of a camera according to an embodiment of the present invention. 
     FIG. 2 is a plan view of an aperture set up dial and four light-emitting devices. 
     FIG. 3 is a partially sectional view of the camera in a state that a lens barrel is extended to a predetermined extension position, in which a left side of the camera is partially broken. 
     FIG. 4 is a view of a right side of the camera in a state that a lens barrel is collapsed to a predetermined collapse position. 
     FIG. 5 is a view of a right side of the camera in a state that a lens barrel is extended to a predetermined extension position. 
     FIGS.  6 ( a )- 6 ( c ) are perspective views showing three states of a rubber bellows, respectively. 
     FIG. 7 is a perspective view of a camera in which a lens barrel is extended to a predetermined extension position. 
     FIG. 8 is a perspective view showing a part of an internal structure of a camera in which a lens barrel is extended to a predetermined extension position. 
     FIG. 9 is a perspective view showing a shutter base in a state that a fixed barrel is removed. 
     FIG. 10 is a perspective view showing a fixed barrel and an aperture member in half way of collapse of a lens barrel. 
     FIG. 11 is an exploded perspective view of a part of a lens barrel in which a shutter base and an external barrel are removed. 
     FIG. 12 is a perspective view of a lens barrel extended to a predetermined extension position, looking from a side of a camera body in a state that a shutter base is removed. 
     FIG. 13 is a perspective view of a cam gear and members provided in the vicinity of the cam gear, looking from a side of the surface of the cam gear. 
     FIG. 14 is a perspective view of a cam gear and members provided in the vicinity of the cam gear, looking from a side of the back of the cam gear. 
     FIG. 15 is a flowchart useful for understanding a series of operations in the camera. 
     FIGS.  16 ( a )- 16 ( e ) are views showing stepwise relations between the cam gear from starting of the rotation to the termination of the rotation and the member contacted to the cam gear. 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Embodiments of the present invention will be described with reference to the accompanying drawings. 
     FIG. 1 is a perspective front view of a camera according to an embodiment of the present invention. 
     A camera  1  is an instant camera of such a type in which a film pack for an instant photography, wherein a film unit for an instant photography is laminated, is mounted on the camera. 
     The film unit used here is exposed on its photosensitive surface with a photographic light, and thereafter a film driving mechanism is driven so that the exposed film unit is developed and discharged out of the camera. The film unit consists of a mono-sheet type of self development-processing sensitized material in which a development pod of the film unit is crushed during development and discharged during driving, and developer is uniformly developed between a photosensitive layer and a transfer layer, so that a developing processing and a transfer processing are performed and whereby a positive image promptly appears. 
     The camera  1  is provided with a front cover  11 , a back cover  12 , and a battery chamber cover  13  which forms an appearance of the camera  1  together with the front cover  11  and the back cover  12 . A camera main frame is provided inside the appearance defined by the front cover  11 , the back cover  12  and the battery chamber cover  13 . 
     On the front center of the camera  1 , there is provided a lens barrel  20  having a cylindrical geometry, which is varied in its position with respect to a camera main frame between before the use of the camera and at the time of the use of the camera, the lens barrel  20  accommodating an image taking lens  21 . Geometry of the lens barrel  20  is not restricted to a cylinder-shaped one, and it is acceptable that the geometry is an angular tube-shaped one. FIG. 1 shows a state that the lens barrel  20  is extended to a predetermined extension position. In the camera  1 , the lens barrel  20  is extended from a predetermined collapsed position provided on the camera main frame so that photography is available when the camera offers the state as shown in FIG.  1 . According to the camera  1 , extension and collapse of the lens barrel  20  are performed by a manual operation, and thus there is no need to provide a driving mechanism necessary for extension and collapse of the lens barrel  20 . Therefore, it is possible to realize the low price of the camera. Further, for the purpose of the user&#39;s convenience in a user&#39;s manual extension operation from the collapsed position, the top portion of the lens barrel  20  is provided with a finger stop  201 . The finger stop  201  of the camera  1  is one projecting in a radius direction of the lens barrel  20  throughout the perimeter of the lens barrel  20 . However, the finger stop  201  of the camera  1  is not restricted to this structure. It is acceptable that the finger stop  201  is one, which partially projects, recesses in opposite throughout the perimeter of the lens barrel  20 , becomes hollow to meet figures of fingers, or is large in frictional resistance. 
     In the right side in the front of the camera  1  (the left side on FIG.  1 ), there is disposed a release button  30 . According to the camera  1 , when the release button  30  is depressed, the film unit is exposed with photographic light. Further, in the oblique upper of the release button  30 , there is provided a flash  40  on the front of which a protector  41  is disposed. Furthermore, in the left side of the protector  41  (the right side on FIG.  1 ), there is provided a flash light receiving window  50  for introducing a flash light to a photo-electric element or a photocell (not illustrated) for receiving light quantity of the flash light reflected on a camera subject at the time of light emission of the flash. Still furthermore, the camera  1  is provided with a photometry section  60  for measuring brightness of field. On the flashlight receiving window  50 , there is provided a light-receiving window  61  for introducing light to a built-in photometric element (not illustrated). The camera  1  is loaded with a reverse-Galilean finder. At the position adjacent to the flash  40 , there is disposed a finder objective window  71 . And at the back of the camera  1 , there is disposed a finder eyepiece window  72 . 
     At the right side of the camera  1 , there is provided a strap through portion  14  through which a strap is passed. 
     On the top of the camera  1 , there is provided a film unit discharge slot  80  for discharging a film unit subjected to the photography out of the camera  1 . At the right side of the film unit discharge slot  80 , there are provided an aperture set up dial  91  and four light-emitting devices  92 . Hereinafter, the aperture set up dial  91  and four light-emitting devices  92  will be explained in conjunction with FIG. 2 together with FIG.  1 . 
     FIG. 2 is a plan view of an aperture set up dial and four light-emitting devices. 
     The aperture set up dial  91  is one of the controls that is to be operated by a user at the time of the use of the camera  1 . The aperture set up dial  91  is provided with an index  91   a  and a cylindrical aperture dial rotating convex member  91   b  for the purpose of easy operation for a user, also in view of the design matter. Four light-emitting devices  92  are disposed on the periphery of the aperture set up dial  91  on an adjacent basis. The light-emitting devices  92  individually emit red light and green light. As will be described later, the aperture values of the camera  1  are selectable between four steps. The light-emitting devices  92  have a one-to-one correspondence with the aperture values. The aperture value of the camera  1  is set up by a mechanism, which will be described later, to an aperture value associated with the light-emitting device  92  to which the index  91   a  meets. When the photometry section  60  measures brightness of field, the light emitting device  92  associated with the aperture value corresponding to the measured brightness of field turns on a light with red to instruct a user to set up the aperture value. When the user adjusts the index  91   a  to the light-emitting device now turning on a light with red through the user&#39;s rotary operation of the aperture set up dial  91 , the light-emitting device  92  now turning on a light with red is changed over to turning on a light with green, so that it is informed the user that the aperture value of the camera  1  is set up to the aperture value according to the brightness of field. According to the present embodiment, the use of the four light emitting devices  92  makes it possible to guide the operation of the aperture set up dial  91  by the user, so that the user can easily set up the aperture value. The four light-emitting devices  92  correspond to the instruction section referred to in the present invention. 
     Next, there will be described the internal structure of the camera  1  shown in FIG.  1 . 
     First, there will be explained an outline of the internal structure of the camera  1 . 
     FIG. 3 is a partially sectional view of the camera in a state that a lens barrel is extended to a predetermined extension position, in which a left side of the camera is partially broken. 
     The main frame of the camera  1  comprises a main body  110  and a fixed barrel  120  for accommodating the collapsed lens barrel  20 . On the lens barrel  20 , as the image taking lens, a first image taking lens  211  and a second image taking lens  212  are supported. In front of the first image taking lens  211 , there is disposed a lens barrier  22  which opens and shuts selectively. The lens barrel  20  further comprises a shutter base  23  on which shutter blades and the like are mounted, an outer cylinder  24  covering the periphery of the shutter base  23 , a barrier ring  25  disposed in front of the shutter base  23 , and a barrier base  26  disposed in front of the barrier ring  25 . The shutter base  23 , the outer cylinder  24 , the barrier ring  25  and the barrier base  26  are collapsed and extended in one united body. The camera  1  is provided with a rubber bellows  130  for shielding the light, which couples the shutter base  23  and the main body  110 . Thus, it is possible to prevent incidence of light different from the photographic light. Further, the main body  110  is provided with two developing rollers  111  as shown with a dotted line. The developing rollers  111  hold therebetween the film unit subjected to the exposure and discharge the same out of the camera  1 . With respect to the film unit held by the developing rollers  111 , a development pod of the film unit is crushed, and developer is uniformly developed between a photosensitive layer and a transfer layer, so that a developing processing and a transfer processing are performed. 
     Next, there will be explained collapse and extension of the lens barrel in conjunction with FIG.  4  and FIG. 5 together with FIG.  3 . 
     FIG. 4 is a view of a right side of the camera in a state that a lens barrel is collapsed to a predetermined collapse position. FIG. 5 is a view of a right side of the camera in a state that a lens barrel is extended to a predetermined extension position. In the cameras shown in any of the figures, the front cover, the back cover and the battery chamber cover are removed. 
     When the lens barrel  20  is collapsed, the shutter base  23  shown in FIG. 3 is received by the main body  110  through a rubber bellows  130  so that the lens barrel  20  is positioned at a predetermined collapse position (cf. FIG.  4 ). On the other hand, when the lens barrel  20  is extended, a rear end  231  of the shutter base  23  shown in FIG. 3 is in contact with a top end  121  of the fixed barrel  120 , so that the lens barrel  20  is positioned at a predetermined extension position (cf. FIG.  3  and FIG.  5 ). Therefore, it is possible for any one through a manual operation to extend the lens barrel  20  to the extension position or to collapse the lens barrel  20  to the collapse position. 
     On the periphery of the shutter base  23  shown in FIG. 3, there are provided two stopper projections  232  (FIG.  4  and FIG. 5) in a peripheral direction of the shutter base at intervals of 180°. On the other hand, on the periphery of the fixed barrel  120 , as shown in FIG.  4  and FIG. 5, there are provided a long hole  122  extending in an extension direction of the lens barrel  20  and a stopper projection  123  projecting toward the outside. The long hole  122  is provided at a position to meet a position on which the stopper projection  232  of the shutter base  23  projects. The stopper projection  232  of the shutter base  23  is inserted into the long hole  122 . The stopper projection  123  of the fixed barrel  120  is provided in the vicinity of the middle of the long hole  122 . Those stopper projections  232  and  123  stop the edges of a toggle spring  300 , respectively. While FIG.  4  and FIG. 5 show only one toggle spring  300 , it is noted that the camera  1  is provided with another toggle  300  located at the opposite position to the position of the illustrated toggle spring  300  of the shutter base  23 . The lens barrel  20  is enabled by the toggle springs  300 , when it is located in the vicinity of the extension position, toward the extension position, and when it is located in the vicinity of the collapse position, toward the collapse position. Consequently, when the toggle springs  300  are used to extend the lens barrel  20  to the vicinity of the extension position or collapse the lens barrel  20  to the vicinity of the collapse position, the enabling force to the operational direction is added. Thus, it is possible to improve operability. Further, according to the present embodiment, two toggle springs  300  are provided at intervals of 180°. This feature makes it possible to prevent the lens barrel  20  from slanting or being caught by the fixed barrel  120  in the extension operation and the collapse operation for the lens barrel  20 . Further, the rubber bellows  130  shown in FIG. 3 also serves to enable the lens barrel  20  to the extension position in the manual extension operation for the lens barrel  20 , and thereby improving operability. Here, there will be explained the rubber bellows with reference to FIG.  6 . 
     FIGS.  6 ( a )- 6 ( c ) are perspective views showing three states of a rubber bellows, respectively. 
     FIG.  6 ( a ) is a perspective view of the rubber bellows wherein the lens barrel is extended to a predetermined extension position. FIG.  6 ( b ) is a perspective view of the rubber bellows wherein the lens barrel is located between a predetermined extension position and a predetermined collapse position. FIG.  6 ( c ) is a perspective view of the rubber bellows wherein the lens barrel is collapsed to a predetermined collapse position. 
     When the lens barrel is extended to a predetermined extension position, the rubber bellows  130  are completely extended and the geometry at that time offers a frustum of pyramid-like shaped one as shown in FIG.  6 ( a ). The rubber bellows  130  has openings at the front  131  and the back  132 , respectively, and as shown in FIG.  3 . The front periphery of the rubber bellows  130  is fixed on the shutter base  23 , and the back periphery of the rubber bellows  130  is fixed on the main body  110 . Further, as shown in FIG.  6 ( a ), a periphery  133  coupling the front periphery and the back periphery, of the rubber bellows  130 , is provided with a recess  1331  in the peripheral direction of the periphery  133 . The portion, on which the recess  1331  is provided, of the periphery  133  is thinner than the remaining portion of the periphery  133 . The periphery  133  of the rubber bellows  130  is folded by the recess  1331 , as the lens barrel changes over from the extension state to the collapse state, and through the state as shown in FIG.  6 ( b ), when the lens barrel collapses to a predetermined collapse position, the lens barrel is completely folded as shown in FIG.  6 ( c ). The rubber bellows  130  shown in FIG.  6 ( c ) is in a state that the front  131  enters downward in the figure over the back  132  and is turned over. When the rubber bellows  130  is turned over, there is no enabling force of the rubber bellows  130  for enabling the lens barrel  20  toward the extension position. 
     Next, there will be explained the internal structure of the camera  1  more in detail in conjunction with FIG.  7 . 
     FIG. 7 is a perspective view of a camera in which a lens barrel is extended to a predetermined extension position. Incidentally, in the camera shown in FIG. 7, the front cover, the rear cover and the battery chamber cover are removed, and further, the outer barrel and the like are removed so that the shutter appears looking from the lens barrel. 
     The camera  1  is provided with a main power switch  115  on a peripheral wall of the fixed barrel  120 . The main power switch  115  is a contact switch having a fixed electrode not varied and a flexible electrode, which is flexible with respect to the fixed electrode. Details of the structure of the contact switch will be described later. On the periphery of the shutter base  23 , there is provided a projection piece  233  projecting outwards. On the peripheral wall of the fixed barrel  120 , there is provided a breaking hole  124  extending in the extension direction of the lens barrel  20 . The projection piece  233  of the shutter base  23  is inserted into the breaking hole  124 . A projecting end of the projection piece  233  projects from the peripheral wall of the fixed barrel  120 . When the lens barrel  20  collapses at the collapse position, the projecting end projecting from the fixed barrel  120 , of the projection piece  233  is located backwards of the main power switch  115 , so that the main power switch  115  turns off. On the other hand, when the extension operation of the lens barrel  20  is performed, the projecting end of the projection piece  233  advances from the back of the main power switch  115  to the main power switch  115  as the extension operation is performed. When the lens barrel  20  is extended to the extension position, the main power switch  115  is pushed by the projecting end of the projection piece  233  as shown in FIG. 7, so that the flexible electrode is in contact with the fixed electrode, whereby the main power switch  115  turns on. In other words, according to the camera  1 , the extension operation of the lens barrel  20  causes the main power switch  115  turns on, and the collapse operation of the lens barrel  20  causes the main power switch  115  turns off. Thus, the operation of the camera is simplified, and also it is possible to prevent a waste of the battery due to forgetting to turn off the main power switch  115 . 
     Next, there will be explained a shutter provided on the camera  1  in conjunction with FIG. 7. A shutter  400  is disposed on the lens barrel  20  and is provided with a shutter blade  410  and a gear  420 . 
     The shutter blade  410  performs open and shut operation in the shutter base  23  on a rotary shaft  410   a  so that an internal film unit (not illustrated) is exposed with a photographic light. The open and shut operation forms a shutter operation of the camera  1 . The shutter blade  410  is enabled so that it is closed by a spring (not illustrated). The shutter blade  410  shown in FIG. 7 is in a state that it is closed. The shutter blade  410  rotates in a clockwise direction on the rotary shaft  410   a  opposing to enabling by a spring (not illustrated), so that an aperture  411  is positioned at an incident path of the photographic light to expose the film unit with the photographic light. Thereafter, the shutter blade  410 , which rotates in a clockwise direction, rotate in the opposite direction by the enabling force by a spring (not illustrated) and then returns to the state that it is closed. A gear  420  is provided in the front of the shutter base  23 . The shutter blade  410  is engaged with the gear  420 . This engagement serves to limit the switching speed of the shutter blade  410 . The engagement is of a governor mechanism. According to the present embodiment, when the shutter blade  410  is opened, the opening speed of the shutter blade  410  is decrease by the governor mechanism and the enabling force of the spring that enables the shutter blade  410 . Thus, according to the present embodiment, it is possible to prevent harmful effects caused by the fact that the opening speed of the shutter blade is too fast. 
     Next, there will be described members provided inside the camera main body more in detail in conjunction with FIG. 8 together with FIG.  7 . 
     FIG. 8 is a perspective view showing a part of an internal structure of a camera in which a lens barrel is extended to a predetermined extension position. 
     A camera main body is provided with a motor  112 . FIG. 8 shows a rotary shaft  112 ′ of the motor  112 . The camera main body is further provided with a reduction gear  113  and a cam gear  114  as a rotary cam. 
     The motor  112  starts the rotation when the release button  30  is depressed. The rotary driving force is transmitted via the reduction gear  113  to the cam gear  114  and the developing roller  111  shown in FIG. 3 as well. 
     The cam gear  114  rotates in a one direction by the rotary driving force of the motor  112 . On a surface of the cam gear  114 , there is provided a first cam plane  1141  in the periphery direction. On the out side of the first cam plane  1141 , there is provided a second cam plane  1142  in the periphery direction. 
     Further, at the rear end of the shutter blade  410 , as shown in FIG. 8, there is provided a flange  412 . According to the camera  1 , a shutter charge mechanism, which will be explained hereinafter in conjunction with FIG.  7  and FIG. 8, is used to kick the flange  412  and thereby opening the shutter blade  410 . 
     A shutter charge mechanism  500 , which is provided on the camera  1 , is disposed on the camera main body as shown in FIG.  7 . The shutter charge mechanism  500  has a charge lever  520  and a set lever  530 . 
     In FIG. 8, the top end  521  of the charge lever  520  is coupled to the flange  412  of the shutter blade  410 . However, FIG. 8 is a perspective view showing a part of an internal structure of a camera in which a lens barrel is extended to a predetermined extension position. The lens barrel is capable of collapsing in an optical axis direction (cf. an arrow A in FIG.  8 ). The top portion  521  of the charge lever  520  is coupled with the flange  412  of the shutter blade  410  only when the lens barrel  20  is extended to a predetermined extension position. The charge lever  520  rotates on a rotary shaft  520   a  shown in FIG.  8 . On the middle of the charge lever  520 , there is provided a contact plane  522  with which the top  531  of the set lever  530  contacts. The rear end of the charge lever  520  is located at the back of the cam gear  114 . While FIG. 8 omits it, as shown in FIG. 7, engaged with a bearing  523  of the rotary shaft of the charge lever  520  is a spring  524  for enabling the charge lever  520  in a direction (upper FIG.  7  and FIG. 8) in which the top end of the charge lever  520  kicks the flange of the shutter blade  410 . One end of the spring  524  is stopped on the contact plane  522 . The charge lever  520  kicks the flange  412  of the shutter blade  410  by the enabling force of the spring  524  so that the shutter  400  performs the shutter operation. According to the present embodiment, the use of the coupling mechanism of the top end  521  and the flange  412 , which are coupled only at the time of the extension, makes it possible to prevent the film unit from being exposed by photographic light even if the release button  30  is erroneously depressed when the lens barrel  20  is collapsed. 
     The set lever  530  rotates on a rotary shaft  530   a  shown in FIG. 8, and has at the rear end a cam follower  532  that contacts with the first cam plane  1141 . Further, as mentioned above, the top  531  of the set lever  530  is in contact with the contact plane  522  of the charge lever  520 . The set lever  530  is enabled in a direction (downwards in FIG.  7  and FIG. 8) opposite to the enabling direction of the charge lever  520  by a spring (not illustrated) having a larger enabling force than the spring (cf. FIG. 7) that enables the charge lever  520 . Also the cam follower  532  is enabled to the first cam plane  1141 . FIG. 8 shows a state that the set lever  530  prevents the top end  521  of the charge lever  520  from kicking the flange  412  of the shutter blade  410  by the enabling force of the spring  524  shown in FIG.  7 . 
     Next, there will be described an aperture member  600  in conjunction with FIG.  8  and FIG.  9 . 
     FIG. 9 is a perspective view showing a shutter base in a state that a fixed barrel is removed. 
     The aperture member  600  is provided with an aperture plate  610 , a click lever  620 , two coupling gears  631  and  632  engaged with one another, a handler  640  coupling to the aperture set up dial  91 , and a click lever enabling spring  650  shown in FIG.  9 . The aperture plate  610  is disposed in front of the shutter blade  410 . The aperture plate  610  is provided with four openings  611 ,  612 ,  613  and  614 , which are different from one another in size. More in detail, the aperture plate  610  is provided with the largest opening  611  at the left side in FIG. 8, and the smaller openings  612 ,  613  and  614  going toward the right side in the named order. The aperture plate  610  is enabled by an aperture plate enabling spring not illustrated in FIG. 8 in a direction counterclockwise in FIG.  8 . Further, the aperture plate  610  is provided with a sawtooth-like shaped engaging member  615 , which is engaged with the top end  621  of the click lever  620 . The top end  621  of the click lever  620  is enabled toward the side of the aperture plate  610  by the click lever enabling spring  650  stopped on the shutter base  23  shown in FIG.  9 . However, the aperture plate  610  rotates on a rotary shaft  610   a , in response to a rotary operation of the aperture set up dial  91 , opposing to the engagement force of the top end  621  of the click lever  620 . Further, in the event that the aperture plate  610  receives a rotary operation of the aperture set up dial  91 , which serves to increase the aperture value, the aperture plate  610  rotates also opposing to the enabling force by the aperture plate enabling spring for enabling the aperture plate  610  per se. That is, upon receipt of the operation of the aperture set up dial  91 , the handler  640  is pushed or drawn. This causes the coupling gear  631  at the side of the aperture set up dial  91  to swing on a shaft  631   a . Then, the coupling gear  632  at the side of the aperture plate  610  also swings on the rotary shaft  610   a  and the aperture plate  610  rotates. For example, as shown in FIG. 8 with arrows, when the aperture set up dial  91  is rotated counterclockwise (cf. an arrow B), the handler  640  is pushed toward the right side of FIG. 8 (cf. an arrow C), so that the coupling gear  631  at the side of the aperture set up dial  91  swings on the shaft  631   a  clockwise (cf. an arrow D). As a result, the coupling gear  632  at the side of the aperture plate  610  swings on the rotary shaft  610   a  counterclockwise (cf. an arrow E) and the aperture plate  610  rotates also counterclockwise (cf. an arrow F). In this manner, upon receipt of the operation of the aperture set up dial  91 , the aperture plate  610  is set up to any one of four aperture values according to the size of the openings  611 ,  612 ,  613  and  614 . Accordingly, as compared with a camera in which the aperture value is automatically set up, it is possible to reduce the cost of the camera. A member, which comprises two coupling gears  631  and  632  mutually engaged with one another and the handler  640 , corresponds to the coupling member referred to in the present invention. 
     Further, there will be explained the aperture member  600  in conjunction with FIG.  10 . 
     FIG. 10 is a perspective view showing a fixed barrel and an aperture member in half way of collapse of a lens barrel. 
     While FIG. 8 omits it, the aperture member  600  has an aperture plate enabling spring  660  one end of which is stopped on the handler  640  and another stopped on the side of the camera main body. The aperture plate  610  is enabled by the aperture plate enabling spring  660  in a direction that the largest opening  611  is located at the incident path of the photographic light. The click lever  620  of the aperture member  600  rotates on the rotary shaft  620   a . When the collapse operation of the lens barrel is performed, the rear end  622  of the click lever  620  runs on to an inclined plane  125  provided on the fixed barrel  120  in half way of the collapse operation, and rotates on the rotary shaft  620   a  as in an arrow G shown in FIG. 10 opposing to the enabling force of the click lever enabling spring  650  shown in FIG. 9 for enabling the click lever  620 , so that the top end  621  of the click lever  620  is disengaged from the engaging member  615  of the aperture plate  610 . Then, the aperture plate  610  rotates (cf. an arrow H) by the enabling force of the aperture plate enabling spring  660  enabling the aperture plate  610  per se, in such a manner that the largest opening  611  is located at the incident path of the photographic light, so that the aperture plate  610  returns to the aperture value according to the largest opening  611  and the aperture set up dial  91  also rotates (cf. an arrow I) in such a manner that the index  91   a  meets the position of the light-emitting device associated with the aperture value of the largest opening  611 . When the lens barrel  20  collapses to a predetermined collapse position, the rear end  622  of the click lever  620  drops from the inclined plane  125  of the fixed barrel  120 , and the top end  621  of the click lever  620  is again engaged with the engaging member  615  of the aperture plate  610  by the enabling force of the click lever enabling spring  650  shown in FIG. 9 enabling the click lever  620 . 
     It often happens that such a type of camera as the camera  1  is used overwhelmingly indoors. The aperture value according to the largest opening  611  is an aperture value optimum to an indoor photography of the aperture values of the camera  1 . According to the present embodiment, since the aperture set up dial  91  is manually rotated so that the aperture value is changed over, it is possible to reduce troublesomeness of the operation of the aperture set up dial  91  by a user by means of returning the aperture plate  610  to the aperture value according to the largest opening  611 , and in addition it is possible to reduce failure in photography due to forgetting set up of the aperture value. In contrast to the camera  1 , in such a type of camera which is used overwhelmingly outdoors, it is preferable that the aperture plate  610  is returned to the aperture value according to the smallest opening  614 . Alternatively, in such a type of camera that it is used half-and-half indoors and outdoors, it is preferable that the aperture plate  610  is returned to the aperture value according to the middle size of openings. According to the camera  1 , to return the aperture plate  610  to the aperture value according to the largest opening  611 , the collapse operation of the lens barrel  20  is utilized. This feature makes it possible to prevent the aperture value from being set up to the aperture value of the largest opening  611  owing to carelessness in photography. 
     According to the camera  1  of the present embodiment, as shown in FIG. 8, the coupling gear  631  at the side of the aperture set up dial  91  is long not so as to disengage the coupling gear  631  with the coupling gear  632  by any operation of the extension and the collapse of the lens barrel  20 . However, a camera according to the present invention is not restricted to the present embodiment, and it is acceptable that the coupling gear  632  at the side of the aperture plate  610  is long, or alternatively it is acceptable that both the coupling gears  631  and  632  are long. 
     Next, there will be explained a lens barrier in conjunction with FIG.  11  and FIG.  12 . 
     FIG. 11 is an exploded perspective view of a part of a lens barrel in which a shutter base and an external barrel are removed. FIG. 12 is a perspective view of a lens barrel extended to a predetermined extension position, looking from a side of a camera body in a state that a shutter base is removed. 
     A lens barrier  22  shown in FIG. 11 is provided with two blade members  221 . The two blade members  221  are pivotally mounted on the barrier base  26 . The barrier base  26  is provided with two pins  261  on which the two blade members  221  are rotatable, respectively. The respective blade member  221  rotates on the associated pin  261 . The two blade members  221  are also provided with two sliding pins  2211 , respectively. The barrier base  26  has two insertion holes  262  through which the two sliding pins  2211  are inserted, respectively, in a peripheral direction. Also the barrier ring has two insertion holes  251  through which the two sliding pins  2211  are inserted, respectively, in the peripheral direction. One end of the coil spring  252  is stopped on the barrier ring  25 . Another end of the coil spring  252  is stopped on the top portion of the sliding pin  2211 , which is inserted via the insertion hole  262  of the barrier base  26  into the insertion hole  251  of the barrier base  25 . The barrier ring  25  has two sliders  253 . Each of the sliders  253  is provided with a sliding member  2531 . The inner wall of the fixed barrel  120  shown in FIG. 12 is provided with projecting guide walls  126  each guiding the associated sliding member  2531 . The slider  253  is positioned at the inner wall plane of the fixed barrel  120 . The sliding member  2531  is in contact with the guide wall  126 . Accordingly, the barrier ring  25  rotates by the extension operation and the collapse operation of the lens barrel and moves in the moving direction of the lens barrel. On the other hand, the barrier base  26  shown in FIG. 11 is fixed on the outer barrel  24  shown in FIG.  12  and is not rotatable. Thus, as shown in FIG. 11, when the lens barrel is extended so that the barrier ring  25  rotates counterclockwise (cf. an arrow J), the two blade members  221  also rotate counterclockwise (cf. an arrow K) on the pins  261 , respectively and thus the lens barrier  22  is opened. On the other hand, when the lens barrel is collapsed so that the barrier ring  25  rotates clockwise (cf. an arrow L), the two blade members  221  also rotate clockwise (cf. an arrow M), respectively and thus the lens barrier  22  is closed. In this manner, according to the present embodiment, the collapse and the extension of the lens barrel by the manual operation are utilized to perform open and close operations for the lens barrier  22 . The coil spring  252  serves to enable the lens barrier  22  to be closed and prevents the lens barrier from being inadvertently opened in the state that the lens barrel is collapsed at the collapse position. 
     Further, there will be described in detail members provided in the vicinity of the cam gear  114  in conjunction with FIG.  13  and FIG.  14 . 
     FIG. 13 is a perspective view of a cam gear and members provided in the vicinity of the cam gear, looking from a side of the surface of the cam gear. FIG. 14 is a perspective view of a cam gear and members provided in the vicinity of the cam gear, looking from a side of the back of the cam gear. 
     As shown in FIG. 13, in the vicinity of the surface of the cam gear  114 , there are provided a cam switch lever  710  and a cam switch  720  as well as the set lever  530 . 
     The cam switch lever  710  rotates on a rotary shaft  710   a . On the middle of the cam switch lever  710 , there is provided a cam follower  711  contacting with the second cam plane  1142 . On the top of the cam switch lever  710 , there is provided a contact  712  contacting with the cam switch  720 . 
     The cam switch  720  is a contact switch having the same structure as the above-mentioned main power switch  115 . The cam switch  720  has a non-deformation of fixed electrode  721  and a flexible electrode  723  fixed on a casing  722 , as shown in FIG.  13 . The flexible electrode  723  is bent with respect to the fixed electrode  721  when the external force pushes the casing  722 . When the flexible electrode  723  contacts with the fixed electrode  721 , the cam switch  720  turns on. When the external force is released, the flexible electrode  723  is separated from the fixed electrode  721  by the elastic force, so that the cam switch  720  turns off. A control unit (not illustrated) of the camera  1  detects the fact that the cam switch  720  changes from the state of the turn-on to the state of the turn-off, and stops the rotation of the motor  112  shown in FIG. 7, so that the rotation of the cam gear  114  is terminated and the rotary driving of the developing roller  111  shown in FIG. 3 is stopped. Incidentally, as mentioned above, the start of rotation of the motor  112  is performed in accordance with the operation of the release switch  30 , and has no connection with the fact that the cam switch  720  turns on. 
     On the other hand, as shown in FIG. 14, the cam member  1143  is provided in the back of the cam gear  114 , and in the vicinity of the back of the cam gear  114  there are provided a synchronizing switch  800  and a holding plate  900  as well as the charge lever  520 . 
     The charge lever  520  has, as mentioned above, the top end  521  coupled to the flange  412  of the shutter blade, and the contact plane  522  with which the top of the set lever  530  contacts, and in addition a pin  525  pushing the synchronizing switch  800  as the charge lever  520  rotates, and a cam follower  526  contacting with the cam member  1143  as the cam gear  114  rotates, in the rear end located at the back of the cam gear  114 . 
     The synchronizing switch  800  is a contact switch having the same structure as the above-mentioned cam switch  720 . When the synchronizing switch  800  is changed from the state of the turn-off to the state of the turn-on, the synchronizing switch  800  instructs the control unit (not illustrated) to perform the light emission of the flash  40 . As shown in FIG. 1, the flash  40  of the camera  1  is provided in front of the camera  1 . Thus, the provision of the synchronizing switch  800  in the vicinity of the cam gear  114  provided on the camera main frame makes it possible to reduce wiring. With respect to the control unit not illustrated, in the event that brightness of field measured by the photometry  60  is not less than a predetermined threshold, even if the control unit receives an instruction of the flash light emission from the synchronizing switch  800 , the control unit prohibits the light emission of the flash  40 . In the event that brightness of field measured by the photometry  60  is less than the predetermined threshold, the control unit permits the light emission of the flash  40  in accordance with the instruction of the flash light emission, and stops the light emission of the flash  40  in accordance with a quantity of flash light reflected on the subject and returned through a flash light receiving window  42 . 
     The holding plate  900  has a first cam follower  910 , a second cam follower  920 , a long hole  930  and a claw  940 . A fixed pin (not illustrated) is inserted into the long hole  930 . The first cam follower  910  and the second cam follower  920  are pushed up by the came member  1143  provided in the back of the cam gear  114 , as the cam gear rotates, the holding plate  900  moves to the developing roller  111  shown in FIG. 3 in its entirety. The claw  940  swings on a shaft  940   a . On the top of the claw  940  there is provided a hook  941 . The hook  941  enters, as the cam gear  114  rotates, between the exposed film unit and a film unit to be subsequently exposed, of a plurality of film units laminated within the film pack, and stops the edge of the lower end of the exposed film unit. The exposed film unit stopped with the hook  941  is carried from the film pack to the developing roller  111  as the holding plate  900  is moved. 
     Lastly, there will be explained a series of operations of the camera of the present embodiment in conjunction with FIG.  15  and FIGS.  16 ( a )- 16 ( e ). 
     FIG. 15 is a flowchart useful for understanding a series of operations in the camera. FIGS.  16 ( a )- 16 ( e ) are views showing stepwise relations between the cam gear from starting of the rotation to the termination of the rotation and the member contacted to the cam gear. 
     First, a user extends the lens barrel  20 , which collapses at a predetermined collapse position, to a predetermined extension position through a manual operation of a finger stop  201  shown in FIG. 1 (a step S 1  in FIG.  15 ). Then, as shown in FIG. 7, the main power switch  115  is pushed by the projection piece  233  so as to turn on. Further, as shown in FIG. 8, the top end  521  of the charge lever  520  is coupled with the flange  412  of the shutter blade  410 . That is, the shutter charge mechanism  500  is coupled with the shutter  400 . Further, the lens barrier  22  shown in FIG. 11 is opened. 
     Next, when the user trains the camera  1  on the subject, the photometry  60  measures the brightness of field (a step S 2  in FIG.  15 ), since the main power switch  115  turns on. In the event that the aperture value according to the measured brightness of field is different from the aperture value of the largest opening  611 , the light-emitting device  92  (cf. FIG. 2) associated with the brightness of field turns on a light with red (a step S 3  in FIG.  15 ). 
     Thereafter, when the user adjusts the index  91   a  to the light-emitting device turning on a light with red through the rotary operation of the aperture set up dial  91 , the aperture plate  610  shown in FIG. 8 rotates in accordance with the operation of the aperture set up dial  91 , so that the aperture value of the camera  1  is set up to the aperture value according to the brightness of field, and the light-emitting device  92  turning on a light with red changes over to turning on a light with green (a step S 4  in FIG.  15 ). Incidentally, according to the camera  1 , when the lens barrel  20  is collapsed, as mentioned above, the aperture plate  610  returns to the aperture value according to the largest opening  611  and the index  91   a  of the aperture set up dial  91  also returns to the position of the light-emitting device associated with the aperture value of the largest opening  611 . Accordingly, in the event that the aperture value according to the brightness of field is the aperture value of the largest opening  611 , the light-emitting device turns on a light with green from the beginning without turning on a light with red as in the step S 3 . 
     When the user pushes the release button  30  (a step S 5  in FIG.  15 ), the motor  112  shown in FIG. 7 starts the rotation (a step S 6  in FIG.  15 ), so that the cam gear  114  shown in FIG.  16 ( a ) starts the rotation by the rotary driving force of the motor  112  (a step S 7  in FIG.  15 ). 
     FIG.  16 ( a ) is a view showing a relation between the cam gear and the member contacting with the cam gear at the time of the start of the rotation of the cam gear. It is noted that each of FIG.  16 ( a ) to FIG.  16 ( e ) is a view showing the state looking from the front side of the cam gear  114 , wherein ones indicated by dotted lines are positioned at the back side of the cam gear  114 . It is assumed that the cam gears  114  shown in FIG.  16 ( a ) to FIG.  16 ( e ) rotate clockwise (cf. the arrows shown in FIG.  16 ( a ) to FIG.  16 ( e )). 
     As shown in FIG.  16 ( a ), the first cam plane  1141  provided on a surface of the gear  114  is in contact with the cam follower  532  of the set lever, and the second cam plane  1142  provided on the surface of the gear  114  is in contact with the cam follower  711  of the cam switch lever. At the back of the cam gear  114 , there is provided the cam member  1143 . At the backside of the cam gear  114 , the first cam follower  910  and the second cam follower  920  of the holding plate  900  are positioned, and in addition the cam follower  526  of the charge lever is positioned. Incidentally, the state of the cam gear  114  shown in FIG.  16 ( a ) is the same as the state of the cam gear  114  shown in FIG.  8 . Accordingly, as mentioned above, even if it is intended that the top end  521  of the charge lever kicks the flange of the shutter blade by enabling of the spring  524  shown in FIG. 7, it is blocked by the set lever  530 . 
     When the cam gear  114  rotates by 20° from the rotation start position, the relation between the cam gear  114  and the member contacting with cam gear is given by the state shown in FIG.  16 ( b ). 
     FIG.  16 ( b ) is a view showing the relation between the cam gear and the member contacting with cam gear when the set lever rotates. 
     As the cam gear  114  rotates, the cam follower  532  of the set lever is pushed up by the first cam plane  1141 , and the set lever  530  shown in FIG. 13 rotates on the rotary shaft  530   a  opposing to the enabling force by a spring not illustrated (a step S 8  in FIG.  15 ), so that the top  531  of the set lever  531  is lifted up in an enabling direction of the spring  524  shown in FIG. 7 for enabling the charge lever  520 . As a result, the charge lever  520  rotates by the enabling force of the spring  524  (a step S 9  in FIG.  15 ), so that the top end of charge lever  520  shown in FIG. 8 kicks the flange  412  of the shutter blade  410  (cf. an arrow P in FIG.  8 ), and the pin  525  shown in FIG. 14 pushes the synchronizing switch  800  indicating the light emission of the flash  40  and turns on the synchronizing switch  800  (a step S 10  in FIG.  15 ). When the flange  412  of the shutter blade  410  is kicked by the top end  521  of charge lever  520 , the shutter operation (cf. the arrow in FIG. 7) for opening and closing the shutter blade  410  is performed (a step S 11  in FIG.  15 ), so that a film unit (not illustrated) is exposed by the photographic light. Further, in the event that the brightness of field is less than a predetermined threshold, the flash  40  emits light in synchronism with the shutter operation (a step S 12  in FIG.  15 ). Incidentally, the rotation of the charge lever  520  causes the cam follower  526  of the charge lever  520  to move inside the cam gear  114 . 
     Thereafter, when the cam gear  114  rotates by 35° from the rotation start position, the relation between the cam gear  114  and the member contacting with cam gear is given by the state shown in FIG.  16 ( c ). When the cam gear  114  rotates by 150° from the rotation start position, the relation between the cam gear  114  and the member contacting with cam gear is given by the state shown in FIG.  16 ( d ). 
     FIG.  16 ( c ) is a view showing the relation between the cam gear and the member contacting with cam gear when the holding plate starts the movement. FIG.  16 ( d ) is view showing the relation between the cam gear and the member contacting with cam gear when the holding plate moves the largest distance. 
     As the cam gear  114  rotates, the first cam follower  910  of the holding plate  900  shown in FIG. 14 is pushed up by the cam member  1143 , so that the film driving operation is performed (a step S 13  in FIG.  15 ). First, as shown in FIG.  16 ( c ), when it begins that the first cam follower  910  of the holding plate  900  is pushed up by the cam member  1143 , the hook  941  of the claw  940  provided on the holding plate  900  shown in FIG. 14 enters between the exposed film unit and a film unit to be subsequently exposed, of a plurality of film units laminated within the film pack, and stops the edge of the lower end of the exposed film unit. The holding plate  900  starts in its entirety the movement to the developing roller  111  shown in FIG.  3 . While the cam gear  114  further rotates from the rotation start position to the position of 150° shown in FIG.  16 ( d ), the film unit stopped by the hook  941  is carried from the film pack to the developing roller  111 . The film unit, which reaches the developing roller  111 , is subjected to the developing processing and the transfer processing, and then discharged out of the camera. In the state shown in FIG.  16 ( c ), the cam follower  711  of the cam switch lever  710  is pushed up by the second cam plane  1142 , the cam switch lever  710  shown in FIG. 13 rotates on the rotary shaft  710   a , so that the contact  712  of the cam switch lever  710  pushes up the cam switch  720  to switch from the turn-off state to the turn-on state. However, the control unit of the camera  1  does not detect that the cam switch  720  becomes the turn-on state. 
     Subsequently, when the cam gear  114  rotates further rotates from the rotation start position to the position of 245°, the relation between the cam gear  114  and the member contacting with cam gear is given by the state shown in FIG.  16 ( e ). 
     FIG.  16 ( e ) is a view showing the relation between the cam gear  114  and the member contacting with cam gear when the charge lever rotates in the opposite direction to the enabling direction by the spring. 
     When the cam gear  114  further rotates, so that the cam member  1143  of the cam gear  114  pushes up the cam follower  526  of the charge lever, the charge lever  520  rotates on the rotary shaft  520   a  shown in FIG. 8 in the opposite direction to the arrow P shown in FIG. 8, opposing to the enabling force of the spring  524  shown in FIG.  7 . The rotation of the charge lever  520  causes the shutter charge operation to be performed, and the charge lever  520  returns to the state (cf. FIG.  16 ( a )) at the time of the start of the rotation of the cam gear  114  (a step S 14  in FIG.  15 ). Further, the rotation of the charge lever  520  causes the contact plane  522  of the charge lever  520  to move in the enabling direction by a spring (not illustrated) for enabling the set lever  530 , so that the set lever  530  is also rotated by the enabling force by the spring and the charge lever  520  returns to the state (cf. FIG.  16 ( a )) at the time of the start of the rotation of the cam gear  114  (the step S 14  in FIG.  15 ). 
     Thereafter, as the cam gear  114  further rotates, the holding plate  900  returns to the position at the time of the start of the rotation of the cam gear  114 . When the cam gear  114  rotates by 360° (cf. FIG.  16 ( a )), the cam follower  711  of the cam switch lever moves along the second cam plane  112 , so that the cam switch lever  710  shown in FIG. 13 rotates on the rotary shaft  710   a . The rotation of the cam switch lever  710  causes the contact  712 , which pushes up the cam switch  720 , to rotate in the opposite direction to the direction of pushing up the cam switch  720 , so that cam switch  720  changes from the turn-on state to the turn-off state. The control unit (not illustrated), which is provided on the camera  1 , detects that the cam switch  720  changes from the turn-on state to the turn-off state, and stops the rotation of the motor  112  (a step S 15  in FIG. 15) to stop the rotation of the cam gear  114  (a step S 16  in FIG.  15 ). 
     As mentioned above in conjunction with FIG. 16, according to the camera  1  of the present embodiment, it is possible to reliably perform a series of main operations of the camera in photography, and also it is possible to reduce the cost of the camera since simply one motor  112  as shown in FIG. 7 can be used as a source of power for performing a series of main operations as mentioned above. 
     When a user manually collapses the lens barrel  20  to a predetermined collapse position, the operation at a step S 17  in FIG. 15 is performed in the camera  1 . That is, the projection piece  233  shown in FIG. 7 goes back backwards the main power switch  115 , so that the main power switch  115  turns off. Further, a coupling of the top end  521  of the charge lever  520  with the flange  412  of the shutter blade  410  is released to close the lens barrier  22 . Furthermore, the aperture plate  610  returns to the aperture value of the largest opening  611 , and the aperture set up dial  91  rotates in such a manner that the index  91   a  meets the position of the light-emitting device  92  associated with the aperture value of the largest opening  611  (a step S 17  in FIG.  15 ). 
     Incidentally, according to the present embodiment, there is explained an example in which the present invention is applied to an instant camera in which a film is delivered out of the camera and is developed. However, the present invention is not restricted to the present embodiment, and it is applicable to the regular camera such a type that photography is performed on a long type of photographic films frame by frame. 
     As mentioned above, according to a camera of the present invention, it is possible to reduce a failure of photography due to user&#39;s forgetting of setting up of an aperture value, and also it is possible to implement reduction of the cost of the camera. 
     While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by those embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and sprit of the present invention.