Abstract:
There is disclosed a camera in which a power for a pop-up action of a built-in strobe is branched and taken out from &amp; barrel-driving power transmitting path, the barrel is popped up in synchronization with an advancing action of the barrel from a retracted position to a shooting position, and a driving source for the barrel and a driving source for the strobe are from a common source. A first interrupting gear and a second interrupting gear are disposed coaxially and mutually movably in an intermediate portion of the barrel gear train. A following spring is interposed between the first interrupting gear and the second interrupting gear. The first interrupting gear idles in a predetermined range with respect to the second interrupting gear. A lock lever and a lock portion are made such that they can be engaged with and disengaged from each other. The lock lever and the lock portion are engaged with each other when the strobe is popped up by the upward movement of a rack, thereby preventing the strobe from moving in a pop-down direction. The following spring accumulates energy by the turning movement of the first interrupting gear in the pop-down direction, and, when the first interrupting gear is turned beyond a predetermined position, the engagement between the lock lever and the lock portion is released, and the pop-down action is carried out by the accumulated energy of the following spring.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a camera having a pop-up strobe for moving a flash light-emitting unit attached to the camera between an irradiation position for shooting and an accommodation position. 
     2. Description of the Related Art 
     Some cameras include an electronic flash (strobe) so that many people can enjoy picture taking easily without failure. The strobe is controlled such that it automatically flashes when the subject brightness is insufficient at the time of picture taking. Of this kind of cameras, there is one having a so-called pop-up mechanism in which, if a main-switch or the like is turned ON so as to bring the camera into a picture taking state, a flash light-emitting unit pops up from an upper face of the camera to a light-emitting position and, if the switch is turned OFF, the light-emitting unit pops down into the accommodation position inside the camera body. 
     Conventionally, as a pop-up driving mechanism of a strobe for a camera including this kind of pop-up mechanism, especially for a camera also including an action mechanism for changing an irradiation angle of a flash light-emitting unit in synchronization with change of a focal length of a lens (“zoom action” hereinafter), there is a pop-up strobe device described in Japanese Patent Laid-Open Publication No. 03038626 A, a retractable zoom strobe device described in Japanese Patent Laid-Open Publication No. 03043721 A, a camera with a built-in strobe is described in Japanese Patent Laid-Open Publication No. 06075278 A, and a camera described in Japanese Patent Laid-Open Publication No. 07110512 A. All of them includes a motor for a strobe only. Japanese Patent Laid-Open Publication No. 04199034 A discloses a camera in which a motor for moving a mirror up and down and for charging a shutter is also used for pop-up operation of a strobe and zooming operation. 
     Of this kind of cameras, there is one in which a barrel holding a lens can be retracted from a shooting position for taking a picture to a retracted position where the lens is accommodated in a casing of the camera so that the outer size of the camera can be compact when the camera is carried or kept in storage. A powered motor built in the camera is utilized for moving the barrel between the shooting position and the retracted position. 
     When the strobe is popped up, the flash light-emitting unit moves between the light-emitting position and the accommodating position and thus, a power of a motor can be utilized, and there is a camera in which a motor for driving the strobe is mounted as described above. Especially in a camera in which a lens can change the focal length and flash light-emitting unit also can be zoomed, a strobe-driving motor for popping up the strobe and moving the flash light-emitting unit is mounted as described above. 
     If a camera separately includes a lens-driving, motor and a strobe-driving motor, the weight of the camera and the size thereof are increased. Further, positions for these motors must be allocated inside the camera, and flexibility in the design of camera is lowered. 
     In the case of a camera in which a strobe-driving motor is also used for moving up and down the mirror and charging the shutter as the one described in Japanese Patent Laid-open Publication No. H4-199034, since there is no direct relation between these mechanisms, the rotation direction of the motor is changed when the motor is used for driving the strobe and when the motor is used for the mirror. However, when a camera includes a zoom mechanism of a lens, it is preferable if the flash light-emitting unit is popped down when the lens is retracted because these actions can be synchronized. 
     SUMMARY OF THE INVENTION 
     Thereupon, it is a first object of the present invention to reduce weight and size of a camera including a retractable barrel and a pop-up mechanism, by using a strobe-driving motor for driving a lens, and popping the strobe up and down in accordance with a retracting action of the barrel. 
     In order to pop-up the strobe reliably, it is necessary to drive the strobe such that a, sufficient distance is secured for pop-up action. If sufficient distance is secured for pop-up action, there is an adverse possibility that a distance between the shooting position and the retracted position of the barrel is increased. If the distance between the shooting position and the retracted position is increased, a length of optical axis of the camera, i.e., a thickness of the camera is adversely increased. 
     Thereupon, it is another object of the invention to provide a camera including a pop-up strobe in which the strobe can be popped up utilizing the power of a barrel-driving motor, and the barrel can reliably move between a shooting position and a retracted position. 
     As technical means for achieving the above object, there is provided a camera including a pop-up strobe, comprising a retracting mechanism for moving a barrel between a retracted position and a shooting position by a power output from a driving source, a pop-up mechanism for moving a flash light-emitting unit between an accommodated position and an irradiating position, power branching means provided in an intermediate portion of a barrel-power transmitting path between the driving source to the barrel, and a pop-up power transmitting path for transmitting a power of the driving source from the power branching means to a driving mechanism of the pop-up mechanism. 
     For example, in the case of a structure in which an output of the driving source is transmitted to the barrel through the power transmitting path comprising a gear train, an appropriate gear constituting the gear train is meshed with another gear as power branching means, and the driving force for the pop-up mechanism of the strobe is obtained from this other gear. Further, the pop-up action is carried out when the barrel is advanced to the shooting position, and the pop-down action is carried out when the barrel is retracted to the retracted position. Therefore, the retracting action of the barrel and the pop-up action of the flash light-emitting unit can be synchronized. 
     According to a second aspect of the invention, there is provided a camera, including a pop-up strobe, comprising a retracting mechanism for moving a barrel between a retracted position and a shooting position by a power output from a driving source, a pop-up mechanism for moving a flash light-emitting unit between an accommodated position and an irradiating position, power branching means provided in an intermediate portion of a barrel-power transmitting path between the driving source to the barrel, and a pop-up power transmitting path for transmitting a power of the driving source from the power branching means to a driving mechanism of the pop-up mechanism, wherein when the barrel is moved from the retracted position to the shooting position, the barrel is further moved forward from the shooting position, a pop-up action for moving the flash light-emitting unit from the accommodated position to the irradiating position is carried out, and, after the pop-up action is completed, the barrel is retracted and moved to the shooting position. 
     As described above, it is preferable to reduce the movement amount of the barrel between the retracted position and the shooting position in order to make the camera thinner. However, if the moving amount from retracted position to the shooting position is reduced, there is an adverse possibility that a sufficient moving amount for pop-up action cannot be obtained. Thereupon, the barrel is further advanced forward from the shooting position to increase the moving amount, and the pop-up action is carried out utilizing this moving amount. Thereafter, the barrel is retracted to the shooting position to bring the camera into the shootable state. If the pop-up mechanism of the strobe is provided with appropriate engaging/disengaging means so that the power caused by the retracting action to the shooting position of the barrel is not transmitted the strobe by the action of the engaging/disengaging means in a state in which the pop-up is completed, the flash light-emitting unit maintains the irradiating position. The flash light-emitting unit is biased in a pop-down direction by the biasing means, the action of the engaging/disengaging means is released halfway through the retracting movement of the barrel to the retracted position, this biasing force is applied to the flash light-emitting unit, and the flash light-emitting unit is brought to the accommodated position. With this arrangement, the pop-up and pop-down action can reliably be carried out. 
     According to a third aspect of the invention, there is provided a camera including a pop-up strobe comprising a zoom lens device including a retracting mechanism for moving a barrel between a retracted position, a wide-angle shooting position and a telephotograph shooting position by a power output from a driving source, a pop-up mechanism for moving a flash light-emitting unit between an accommodated position and an irradiating position, power branching means provided in an intermediate portion of a barrel-power transmitting path between the driving source to the barrel, and a pop-up power transmitting path for transmitting a power of the driving source from the power branching means to a driving mechanism of the pop-up mechanism, wherein when the barrel is moved from the retracted position to the wide-angle shooting position. The barrel is further moved forward from the wide-angle shooting position, a pop-up action for moving the flash light-emitting unit from the accommodated position to the irradiating position is carried out, and, after the pop-up action is completed, the barrel is retracted and moved to the wide-angle shooting position. 
     When the strobe is popped up, the barrel in the retracted position is slightly advanced beyond the shooting position and then, the barrel is retracted to the shooting position. An advancing/retracting mechanism of the barrel for advancing the barrel from the shooting position and then retracting the barrel is complicated in structure, and in the case of a camera having tie retracting mechanism provided with a unifocal lens device which has a merit of simple structure, if the camera is provided w the advancing/retracting mechanism; its merit is lost. On the other hand, in the case of a camera having a zoom lens device, the barrel is advanced from the retracted position to the wide-angle shooting position, and it is advanced and retracted between the wide-angle shooting position and the telephotograph shooting position by the zoom action. Therefore, it is unnecessary to separately prepare the advancing/retracting mechanism which advances the barrel from the retracted position beyond the wide-angle shooting position and then retract the barrel to the wide-angle shooting position. 
     According to a fourth aspect of the invention, a constituent element of the pop-up power transmitting path is provided with power accumulating means, the power accumulating means accumulates a power halfway through the pop-up action, and when the barrel is popped down from the irradiating position to the accommodated position, the pop-down action is carried out by the accumulated power. 
     As described above, it can be biased against the flash light-emitting unit by the biasing means but in this case, it is always biased, and, when a coil spring is utilized, for example, there is an adverse possibility that a desired action cannot be obtained because of fatigue. If, however, the power is accumulated at the time of pop-up action, the desired action is not prevented from being obtained by the fatigue even if the power accumulating means comprises a coil spring because the coil spring is usually in its natural length state. Further, since the pop-down action is carried out by the accumulated power, the pop-down action can be carried out irrespective of the moving amount of the barrel. Even if the distance between the retracted position and the shooting position is shortened for reducing the thickness of the camera, the pop-down action can reliably be carried out. The moving amount of the barrel can be reduced to a minimum by combining the invention of the fourth aspect with the second or the third aspect. 
     According to a fifth aspect of the invention, the camera further comprises a pair of interrupting power transmitting elements which are provided in the pop-up power transmitting path, and which are capable of relatively move and mutually transmitting a moving power, non-interference means for cutting a transmission of the moving force between the pair of interrupting power transmitting elements, and moving-preventing means for preventing a second interrupting power transmitting element of the pair of interrupting power transmitting elements disposed closer to the flash light-emitting unit from moving in a predetermined direction, wherein the power accumulating means is interposed between the pair of interrupting power transmitting elements, when a first interrupting power transmitting element disposed closer to the power branching means is moved from its original position to a second position in a normal direction, the second interrupting power transmitting element is moved from its original position to a second position, and the flash light-emitting unit is moved to the irradiating position, the second interrupting power transmitting element is prevented from moving toward the original position by the moving-preventing means in a state in which the second interrupting power transmitting element is in the second position. The power accumulating means accumulates power by moving the first interrupting power transmitting element from the second position to a first position in the opposite direction, a moving-preventing operation of the moving-preventing means is acting, a movement of the first interrupting power transmitting element from the first position to the second position transmitted to the second interrupting power transmitting element by the non-interference means, a restraint of the second interrupting power transmitting element by the moving-preventing means is released by moving the first interrupting power transmitting element from the first position toward the original position in the opposite direction, thereby allowing the second interrupting power transmitting element to move, the flash light-emitting unit is moved to the accommodated position by the power accumulating means, in a state in which the first interrupting power transmitting element and the second interrupting power transmitting element are in their original positions, the barrel is in the retracted position, and the flash light-emitting unit is in the accommodated position, and the camera is brought into a shootable state when the first interrupting power transmitting element is in the first position. 
     If the barrel is moved from the retracted position to the wide-angle shooting position in the case of a camera having a zoom lens device or other variable focus lens, or to the shooting position, i.e., forward in the case of a camera having a short focus lens, its power is transmitted to the first interrupting power transmitting element through the power branching means, and the first interrupting power transmitting element is moved from the original position in the normal direction. At that time, the second interrupting power transmitting element is also moved from the original position in the same direction together with the first interrupting power transmitting element, thereby moving the flash light-emitting unit from the accommodated position to the irradiating position. If the barrel advances to an appropriate position beyond the wide-angle shooting position or the shooting position, the first and second interrupting power transmitting element move to the second positions, and the flash light-emitting unit comes to the irradiating position. The moving-preventing means is connected to the second interrupting power transmitting element located in the second position, and the second interrupting power transmitting element is prevented from moving toward the original position. If the barrel is retracted to the wide-angle shooting position or the shooting position, the first interrupting power transmitting element moves from the second position and comes to the first position. At that time, the power is accumulated in the power accumulating means. On the other hand, since the second interrupting power transmitting element is maintained in the second position, the flash light-emitting unit is maintained in the irradiating position and thus, the strobe shooting can be carried out. 
     If the barrel is retracted from the wide-angle shooting position or the shooting position to the retracted position, the first interrupting power transmitting element moves from the first position to the original position. Since the restriction by the moving-preventing means is released halfway through this movement, the second interrupting power transmitting element is set free. Further, since the power for moving toward the original position is applied to the second interrupting power transmitting element by the power accumulating means, the second interrupting power transmitting element moves to the original position by this biasing force. At that time, the barrel is in the wide-angle shooting position or the shooting position, and the camera is brought into the shootable state. 
     According to a sixth aspect of the invention, the pair of interrupting power transmitting elements comprise power transmitting elements which are capable of turning mutually and coaxially. That is, the interrupting power transmitting elements may be capable of mutually sliding straight but, when the barrel-power transmitting path comprises a gear train, the rotating force is obtained from the power branching means. Therefore, in order to transmit this rotating force to the driving mechanism of the pop-up mechanism efficiently, it is preferable that the pop-up power transmitting path also comprises a gear train. When this structure is employed, it is preferable that the interrupting power transmitting element can also turn because the structure is simplified, and if the transmitting element can turn, the installation space is reduced, which is advantageous for reducing the camera in size. 
     According to a seventh aspect of the invention, one of the pair of interrupting power transmitting elements is provided with a projection. The other is provided with a receiving groove for accommodating the projection, and the non-interference means does not transmit the power between the interrupting power transmitting elements when the projection is not in engagement with any of ends of the receiving groove. Since the non-interference means comprises the combination of the projection and the receiving groove, the power can be transmitted reliably with such a structure. 
     According to an eighth aspect of the invention, the power accumulating means comprises a torsion coil spring whose opposite ends are respectively engaged with ends of the interrupting power transmitting elements. When the pair of interrupting power transmitting elements can turn mutually, the torsion coil spring is connected between both the elements. If one of the transmitting element is fixed and the other is turned, the torsion coil spring is twisted and resilience is accumulated. Therefore, if the fixed state of the one transmitting element is released, this transmitting element is turned in the same direction as the other transmitting element. 
     According to a ninth aspect of the invention, there is provided a pop-up method of a strobe of a camera having a pop-up strobe, wherein when a retracting action for moving a barrel between a retracted position and a shooting position by a power output from a driving source is carried out, a pop-up action for moving a flash light-emitting unit from an accommodated position to an irradiating position is carried out in synchronization with the moving action of the barrel. If the barrel is moved from the retracted position to the shooting position, the flash light-emitting unit, is popped up to the retracted position in synchronization with this moving action. If the barrel is moved from the shooting position to the retracted position, the flash light-emitting unit is popped down to the accommodated position. 
     According to a tenth aspect of the invention, there is provided a pop-up method of a strobe of a camera having a pop-up strobe, wherein a retracting action for moving a barrel between a retracted position and a shooting position by a power output from a driving source is carried out, a pop-up action for moving a flash light-emitting unit from an accommodated position to an irradiating position is carried out in synchronization with the moving action of the barrel, when the barrel is moved to a shooting position, the barrel is advanced slightly from the shooting position, the flash light-emitting unit is moved to the irradiating position with this advancing action and then, the barrel is retracted to the shooting position. When the camera is brought into the shootable state, the barrel moves beyond the shooting position. The strobe can reliably pop up by this moving distance. Thereafter, if the barrel is moved to the shooting position, the camera can be used for shooting in a state in which the strobe is popped up. 
     These and other features, objects, and advantages of the present invention will become apparent upon reading the following description thereof together with reference to the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a schematic front view showing the structure of a camera including a pop-up strobe according to the present invention; 
     FIG. 2 is an enlarged schematic exploded perspective view showing the structure of an essential portion of a driving mechanism of the pop-up strobe; 
     FIG. 3 is a schematic front view showing the pop-up action of the pop-up mechanism and showing a state in which a barrel is retracted; 
     FIG. 4 is a schematic front view showing the pop-up action of the pop-up mechanism and showing a state immediately after the pop-up action was completed; 
     FIG. 5 is a schematic front view showing the pop-up action of the pop-up mechanism and showing a state in which the barrel is in a shooting position on a short focus side; 
     FIG. 6 is a schematic front view showing the pop-up action of the pop-up mechanism and showing a state in which the barrel is in the shooting position on a long focus side; 
     FIG. 7 is a schematic front view showing the pop-up action of the pop-up mechanism and showing a state in which the barrel is retracted; 
     FIG. 8 is a schematic view showing the pop-up action of the pop-up mechanism and showing a state in which the barrel is in the shooting position on the short focus side; 
     FIG. 9 is a side view showing the zoom action of the pop-up mechanism and showing a state in which the barrel is in the shooting position on the long focus side; 
     FIG. 10 is a schematic block electrical circuit diagram showing a control system of the camera including the pop-up strobe according to the invention.; 
     FIG. 11 is a flowchart showing the procedure executed for bringing the camera including the pop-up strobe of the invention into a shootable state; and 
     FIG. 12 is a flowchart showing the procedure executed for bringing the camera including the pop-up strobe of the invention into a non-shootable state. 
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     A camera including a pop-up strobe of the present invention will be explained below concretely based on an illustrated preferred embodiment. This embodiment shows a case in which a motor for carrying out a zoom action in agreement with a pop-up action is mounted in the camera. A mechanism for carrying out a zoom action will also be explained together with a pop-up mechanism. 
     FIG. 1 is a schematic front view showing the structure of a camera including a pop-up strobe according to the present invention. The power of a barrel motor  1  as a driving source disposed in a lower portion of a camera body is transmitted to a barrel driving gear  5  provided on an outer peripheral face of a barrel  4  from a driving gear  2  fitted to an output shaft  1   a  through an appropriate gear train  3  constituting a barrel-power transmitting path. As the barrel  4  is turned around the optical axis, a predetermined barrel is retracted in the optical axis direction through an appropriate mechanism such as a cam mechanism, thereby moving the lens in the same direction. This moving range is between a retracted position where the lens cannot be used for shooting and a position where the lens can be used for shooting, and between a wide-angle shooting position, where the focal length is short and a telephotograph shooting position where the focal length is long, and the barrel comes the forefront position. 
     A branch gear  8  constituting power branching means is meshed with a gear  3   a  constituting the gear train  3 . A gear train  10  constituting a pop-up mechanism is connected to the branch gear  8 . A transmitting gear  12  is meshed with an input gear  11  which is coaxial with the branch gear  8 , a first interrupting gear  13  constituting a first interrupting power transmitting element is meshed with the transmitting gear  12 . A second interrupting gear  14  constituting a second interrupting power transmitting element is provided coaxially with the first interrupting gear  13 . The first interrupting gear  13  and the second interrupting gear  14  are supported such that they can be turned together. 
     A lock lever  15  constituting moving-preventing means is turnably supported by a turning shaft  12   a  of the transmitting gear  12 . The transmitting gear  12  is provided at its side with a releasing projection  16  which is engaged with and disengaged from the lock lever  15  by the turning motion of the transmitting gear  12 . The lock lever  15  can turn in an undermentioned direction by resilience of a pushing spring  17  comprising a compression coil spring. As shown in FIG. 2, a following spring  18  comprising a torsion spring constituting power accumulating means is interposed between the first interrupting gear  13  and the second interrupting gear  14 . An end of the following spring  18  is locked to the first interrupting gear  13  and the second interrupting gear  14 . Therefore, if the first interrupting gear  13  is turned in a state where the second interrupting gear  14  is fixed, the following spring  18  is twisted and the resilience is accumulated. At that time, if the fixed state of the second interrupting gear  14  is released, the second interrupting gear  14  is turned in the same direction in which the first interrupting gear  13  was turned. An engaging projection  13   a  projects from a face of the first interrupting gear  13  opposed to the second interrupting gear  14 . On the other hand, an arc receiving groove  14 a having appropriate length for receiving the engaging projection  13   a  is formed in a face of the second interrupting gear  14  opposed to the first interrupting gear  13 , thereby forming dead band means. That is, when the engaging projection  13   a  is moved in the receiving groove  14   a , a turning force is not transmitted between the first interrupting gear  13  and the second interrupting gear  14 . When the engaging projection  13   a  abuts against any one of end edges  14   b  and  14   c , a turning force in a direction in which the engaging projection  13   a  pushes the one of the end edges or in a direction in which the one of the end edges pushes the engaging projection  13   a  is transmitted. 
     As shown in FIG. 1, a control gear  19  is meshed with the second interrupting gear  14 , a driving gear  20  which is rotated in unison with the control gear  19  is provided coaxially with the control gear  19 . A rack  21  is meshed with the driving gear  20 , and the rack  21  is straightly moved if the driving gear  20  is turned. The control gear  19  is provided at its side with a lock plate  22  which is circular around a turning shaft of the control gear  19 . The lock plate  22  includes a lock portion  22   a  which is partially expanded into a fan-shape to constitute moving-preventing means. The lock lever  15  receives the resilience of the pushing spring  17  to enter a turning region of the lock portion  22   a.    
     As shown in FIG.  1  and FIGS. 7 to  9 , the rack  21  is provided on an exchanging plate  31  which is slidably supported in the vertical direction as viewed in FIG.  1 . The exchanging plate  31  is formed with a pair of long guide holes  31   a  arranged vertically, whose longitudinal direction is along a sliding direction of the exchanging plate  31 . Guide pins  32  embedded in the camera body are loosely inserted through the guide holes  31   a.    
     A driving plate  36  is provided such as to be superposed on the exchanging plate  31 . As shown in FIGS. 7 and 9, a pair of driving holes  36   a , whose longitudinal direction is along a direction appropriately inclined with respect to the guide holes  31   a , are formed in the driving plate  36 . The guide pins  32  are also loosely inserted through the driving holes  36   a . An extension spring  37  is stretched between the exchanging plate  31  and the driving plate  36 . 
     An upper portion of the driving plate  36  is extended upward, and the upper portion is provided with a cam  39  formed with a cam hole  38 . The cam  39  is located on a side portion of a flash light-emitting unit  40 . The flash light-emitting unit  40  is accommodated in a strobe casing  41  turnably supported around a supporting shaft  42  on a rear side of the camera body, and a light-emitting window  43  is mounted to the strobe casing  41  at the front side. The flash light-emitting unit  40  is popped up and down by the turning motion of the strobe casing  41  around the supporting shaft  42 . In a pop-down state, a back side of the strobe casing  41  is located at an upper side and substantially coincides with an upper face of the camera body, and, in a pop-up state, the light-emitting window  43  is directed forwardly. 
     A driving lever  44  is turnably supported by the supporting shaft  42  of the strobe casing  41 . A driving spring  45  comprising a torsion coil spring fitted in the supporting shaft  42  is bridged between the driving lever  44  and the strobe casing  41 . The driving lever  44  is formed with a long input hole  44   a , and an input pin  46   a  embedded in a tip end of a pop-up lever  46  is loosely inserted through the driving lever  44 . 
     As shown in FIGS. 7 to  9 , the pop-up lever  46  is formed into a substantially V-shape, and one end of the V-shape is turnably supported by the camera body through a shaft  46   b . A resilience of a driving spring  47  comprising a compression spring is applied to a bent portion of the V-shape so that the pop-up lever  46  is turned in a direction in which the flash light-emitting unit  40  is popped up, i.e., in a direction in which the strobe casing  41  is turned in the clockwise direction around the supporting shaft  42  in FIG.  7 . The input pin  46   a  is embedded in the other end of the V-shape of the pop-up lever  46 . A restriction pin  46   c  is embedded in a portion of the pop up lever  46  between its bent portion and the input pin  46   a  so that the restriction pin  46   c  receives the resilience of the driving spring  47  and the restriction pin  46   c  is pushed into an appropriate position on an outer side edge of the cam.  39  of the driving plate  36 . 
     The flash light-emitting unit  40  is supported along a bottom of the strobe casing  41  such that the flash light-emitting unit  40  can slide in the optical axis. The flash light-emitting unit  40  is biased by biasing means (not shown) so that an input pin  40   a  embedded in the side of the flash light-emitting unit  40  is located in the cam hole  38 , and is pushed within the cam hole  38  by a cam face  38   a.    
     FIG. 10 is a block diagram showing a control system for controlling the action of the camera including the pop-up strobe, and mainly comprises a CPU  51 . Input to the CPU  51  are metering data concerning brightness of a subject obtained by a metering circuit  52 , distance data concerning a distance between the lens and the subject obtained by an auto focus (AF) circuit  53 , and positional data concerning an advance/retract position of the barrel obtained by an barrel encoder  54 . On the other hand, CPU  51  sends a motor driving signal to a driver circuit  55  which advances or retracts the barrel motor  1 , a driver circuit  57  for driving an AF motor  56  which drives an AF of the lens, and a driver circuit  59  for driving a transport motor  58  which winds and rewinds the first frame set of a film. By turning a main switch  60  ON or OFF, the CPU  51  switches a state of camera between a shootable state and a non-shootable state which is selected when the camera is carried. A release switch  61  for allowing the camera to execute a release action is connected to the CPU  51 . 
     First, with reference to flowcharts in FIGS. 11 and 12, a procedure for bringing the camera into the shootable state and a procedure for bringing the camera into the non-shootable state will be explained. When the camera is to be brought into the shootable state, a procedure shown in FIG. 11 is executed. If the main switch  60  is turned on (step  1101 ) (step is abbreviated as “S” hereinafter), a driving signal is sent from the CPU  51  to the driver circuit  55  in order to bring the camera into the shootable state (S 1102 ). An output signal of the barrel encoder  54  is monitored, and it is judged whether the barrel came to an inverted position which corresponds to a second position which will be described later (S 1103 ), and the barrel is advanced to the inverted position. 
     If the barrel came to the inverted position (YES in S 1103 ), the barrel motor  1  is rotated reversely, thereby transferring the barrel (S 1104 ). An output signal of the barrel encoder  54  is monitored, it is judged whether the barrel came to the shooting position corresponding to a first position which will be described later (S 1105 ) and if YES, (YES in S 1105 ), the operation of the barrel motor  1  is stopped (S 1106 ), the procedure is completed (S 1107 ). In this state, the barrel is in the shooting position, and the camera is in a shooting state. In a state where the barrel is in the shooting position, and if the barrel is of a zoom lens device, the lens is in a wide-angle shooting position, and if the barrel is of a unifocal lens device, the lens is in infinity shooting position. 
     In order to bring the camera into the non-shootable state, the procedure shown in FIG. 12 is executed. If the main switch  60  is turned OFF (S 1201 ), the barrel motor  1  is operated in the direction to retract the barrel, and the barrel is transported (S 1202 ). It is monitored whether the barrel came to the retracted position by the output signal of the barrel encoder  54  (S 1203 ). In a state where the barrel is in the retracted position (YES in S 1208 ), the camera is brought into the non-shootable state, the barrel motor  1  is stopped (S 1204 ), and the main switch OFF procedure is completed (S 1205 ). 
     Next, the pop-up and pop-down actions will be explained with reference to FIGS. 3 to  6 . The actions will be explained with reference to the operating procedure shown in FIGS. 11 and 12. 
     FIG. 3 shows a state in which the barrel is in its retracted position, and the flash light-emitting unit  40  is in its accommodated position. In this state, the releasing projection  16  of the transmitting gear  12  turns the lock lever  15  against the resilience of the pushing spring  17 , and the lock lever  15  is disengaged from the lock portion  22   a . The engaging projection  13   a  of the first interrupting gear  13  is located in the vicinity of one of the end edges  14   b  of the receiving groove  14   a  of the second interrupting gear  14 . The positions of the first interrupting gear  13  and the second interrupting gear  14  are defined as original positions. In the original positions, the following spring  18  is in its natural state, and the resilience is not accumulated. 
     In the state shown in FIG. 3, if the main switch  60  is turned ON to bring the camera into the shootable state (S 1101 ), the barrel motor  1  is operated, its output rotation is transmitted to the barrel driving gear  5  provided on the barrel  4 , and the predetermined barrel holding the lens is advanced from the retracted position (S 1102 ). At that time, the branch gear  8  is turned in the clockwise direction in FIG. 3 by the output rotation of the barrel motor  1 . If the turning force is transmitted to the transmitting gear  12 , the transmitting gear  12  is turned in the counterclockwise direction in FIG. 3, and the releasing projection  16  is disengaged from the lock lever  16 . Therefore, the lock lever  15  receives the resilience of the pushing spring  17 , is turned, and abuts against the outer peripheral face of the lock portion  22   a  of the lock plate  22 . The turning force of the transmitting gear  12  is transmitted to the first interrupting gear  13 , and the first interrupting gear  13  is turned in the clockwise direction in FIG.  8 . If the engaging projection  13   a  of the first interrupting gear  13  abuts against the end edge  14   b  of the receiving groove  14   a  by this turning motion as shown in FIG. 3, the second interrupting gear  14  is also turned in the same direction. Therefore, the control gear  19  and the driving gear  20  are turned in the counterclockwise direction in FIG. 3 to move the rack  21  which is meshed with the driving gear  20  upward in FIG.  3 . By this upward movement of the rack  21 , the strobe casing  41  is turned from its accommodated position to the irradiating position, thereby causing the pop-up action of the strobe. 
     FIG. 7 shows a state in which the strobe is in its accommodated position. From this state, if the rack  21  moves upward, the exchanging plate  31  forming the rack  21  moves upward in FIG.  7 . If the exchanging plate  31  moves upward, the driving plate  36  is pulled through the extension spring  37  and moves in the same direction. The guide pins  32  are loosely inserted through the driving holes  36   a  of the driving plate  36 , and the driving holes  36   a  are formed such that they are inclined with respect to the guide holes  31   a  of the exchanging plate  31 . Therefore, the driving plate  36  moves upward and the driving holes  36   a  are guided by the guide pins  32  and retracted. If the driving plate  36  moves upward, the restriction pin  46   c  abuts against the outer periphery of the cam  39  of the driving plate  36 , and the restricted pop-up lever  46  is turned in the counterclockwise direction in FIG. 7 around the shaft  46   b  by the resilience of the driving spring  47 . By this turning motion., the input pin  46   a  is turned in the same direction around the shaft  46   b , and the driving lever  44  having the input hole  44   a  through which the input pin  46   a  is loosely inserted is turned in the clockwise direction in FIG. 7 around the supporting shaft  42 . By the turning motion of the driving lever  44 , the driving spring  45  is twisted, its resilience is applied to the strobe casing  41 , the strobe casing  41  is turned in the clockwise direction in FIG. 7 around the supporting shaft  42 . This turning motion causes the pop-up action of the strobe, and this state is shown in FIGS. 4 and 8. 
     Positions of the first interrupting gear  13  and the second interrupting gear  14 , shown in FIGS. 4 and 8, are defined as second positions. That is, the main switch  60  is turned ON, and the barrel is advanced from its retracted position (S 1102 ). If the barrel advances to the inverted position (YES in S 1103 ), the first interrupting gear  13  and the second interrupting gear  14  move from the original positions to the second positions. In the state where the first interrupting gear  13  and the second interrupting gear  14  are located at the second positions, the engaging projection  13   a  is in abutment against the end edge  14   b  of the receiving groove  14   a . If the first interrupting gear  13  is turned in the clockwise direction in FIG. 4, the second interrupting gear  14  is also turned in the same direction. The outer peripheral face of the lock portion  22   a  is released from the lock lever  15 , and the lock lever  15  is engaged with the end edge of the lock portion  22   a . Therefore, the lock plate  22  and the control gear  19  are prevented from turning in the clockwise direction in FIG.  4 . 
     In the state in which the first interrupting gear  13  and the second interrupting gear  14  are at located at the second positions, the predetermined barrel which has advanced from the retracted position is in the inverted position, which is forward of the wide-angle shooting position on the short focus side. Therefore, the barrel is retracted to the wide-angle shooting position (S 1104 ). If the barrel is retracted to a predetermined position, the branch gear  8  is turned in the counterclockwise direction in FIG.  4 . If this turning force is transmitted to the first interrupting gear  13  through the transmitting gear  12 , the first interrupting gear  13  is turned in the counterclockwise direction in FIG.  4 . At that time, since the engaging projection  13   a  of the first interrupting gear  13  is turned in the same direction, it is turned in the receiving groove  14   a , the turning force of the first interrupting gear  13  is not transmitted to the second interrupting gear  14 . Further, since the second interrupting gear  14  which is meshed with the control gear  19  is not turned in the clockwise direction in FIG. 4 because the control gear  19  is prevented from turning in the clockwise direction FIG.  4 . Therefore, the following spring  18  interposed between the first interrupting gear  13  and the second interrupting gear  14  is twisted by the turning motion of the first interrupting gear  13 , and power is accumulated in the following spring  18 . 
     If the predetermined barrel is retracted to the wide-angle position (S 1105 ), the first interrupting gear  13  is located in the first position as shown in FIG.  5 . That is, the engaging projection  13   a  is located in the medium position of the receiving groove  14   a . The releasing projection  16  of the transmitting gear  12  is located in the vicinity of the lock lever  16 . In this state, since the barrel is in the shootable position, the camera can be used for shooting. Further, since the flash light-emitting unit  40  is popped up, the strobe can be used as necessary. 
     When the camera is not used, the main switch  60  is turned OFF (S 1201 ). With this operation, the barrel is retracted from the shootable position to the retracted position (S 1202 ). By the output rotation of the barrel motor  1  for retracting the barrel, the branch gear  8  is turned in the counterclockwise direction from the state shown in FIG.  5 . The transmitting gear  12  is turned in the clockwise direction in FIG. 5, the releasing projection  16  pusher, the lock lever  15 , and the lock lever  16  is turned in the clockwise direction in FIG. 5 against the resilience of the pushing spring  17 . Since the lock lever  15  is disengaged from the lock portion  22   a  by this turning motion, the control gear  19  and the driving gear  20  are allowed to turn in the clockwise direction in FIG.  5 . On the other hand, the power is accumulated in the following spring  18 , the first interrupting gear  13  receives the power of the transmitting gear  12  and is turned in the counterclockwise direction in FIG. 5, and the second interrupting gear  14  follows the first interrupting gear  13  and is turned in the same direction by this accumulated force of the following spring  18 . By this turning motion, the control gear  19  and the driving gear  20  are turned in the clockwise direction. In a state in which the barrel has been retracted to the retracted position, the first interrupting gear  13  is turned to its original position, and the second interrupting gear  14  which followed the first interrupting gear  13  is also located in its original position as shown in FIG.  3 . The driving gear  20  is also in a state shown in FIG.  3 . Thus, the flash light-emitting unit  40  is located in its accommodated position. 
     That is, the rack  21  is lowered from the state shown in FIG. 8 by the turning motion of the driving gear  20 , and the exchanging plate  31  is lowered. If the exchanging plate  31  is lowered, the driving plate  36  is pulled by the extension spring  37 , the driving holes  36   a  are guided by the guide pins  32 , and the driving plate  36  is advanced while being lowered from a state shown in FIG.  8 . If the driving plate  36  is lowered, the cam  39  pushes the restriction pin  46   c  downward against the resilience of the driving spring  47  so that the pop-up lever  46  is turned in the clockwise direction in FIG. 8 around the shaft  46   b , thereby turning the driving lever  44  to which the input pin  46   a  is connected in the counterclockwise direction in FIG.  8 . Therefore, the strobe casing  41  connected to the driving lever  44  through the driving spring  45  is turned in the counterclockwise direction in FIG. 8 around the supporting shaft  42 , and the strobe casing  41  is brought into its accommodated position as shown in FIG.  7 . The barrel is located in its retracted position (S 1203 ). 
     Next, the zoom action of the flash light-emitting unit  40  will be explained with reference to FIGS. 5,  6 ,  8  and  9 . A positional relationship of the transmitting gear  12 , the first interrupting gear  13 , the second interrupting gear  14 , the control gear  19 , the lock plate  22 , and the rack  21  and the like in a state in which a predetermined barrel holding the lens is in the wide-angle shooting position is shown in FIG. 5, end a position of the flash light-emitting unit  40  is shown in FIG.  8 . 
     The barrel is advanced in order to move the lens to the telephotograph shooting position where the focal length is long. The branch gear  8  receives the power of the barrel motor  1  and is turned in the clockwise direction in FIG.  5 . The transmitting gear  12  is turned in the counterclockwise direction in FIG. 6, the releasing projection  16  is separated from the lock lever  15  and therefore, the engagement state between the lock lever  15  and the lock portion  22   a  is maintained. The first interrupting gear  13  is turned in the clock-wise direction in FIG. 6, the engaging projection  13   a  moves in the receiving groove  14   a , and, therefore, the first interrupting gear  13  idles until the engaging projection  13   a  abuts against the end edge  14   b  of the receiving groove  14   a . At that time, the power accumulated in the following spring  18  disappears, but the power is again accumulated when the first interrupting gear  13  is again turned in the opposite direction. After the engaging projection  13   a  is turned in the clockwise direction in FIG.  5  and abuts against the end edge  14   b  of the receiving groove  14   a , the second interrupting gear  14  follows the turning motion of the first interrupting gear  13  and is also turned in the clockwise direction in FIG. 6, and, therefore, the control gear  19  meshed with the second interrupting gear  14  and the driving gear  20  which is coaxial with the control gear  19  are turned in the counterclockwise direction in FIG. 5, and the rack  21  meshed with the driving gear  20  is moved upward. 
     By the upward movement of the rack  21 , the exchanging plate  31  is also moved upward, and the driving plate  36  is also moved upward through the extension spring  37 . When the driving plate  36  is moved upward, since the driving holes  36   a  are guided by the guide pins  32 , the driving plate  36  is moved upward while being retracted gradually. If the driving plate  36  is moved upward while being retracted, the input pin  40   a  which is in abutment against the cam face  38   a  of the cam hole  38  formed in the upper portion of the driving plate  36  is guided by the cam face  38   a  and moved. Therefore, the flash light-emitting unit  40  included in the input pin  40   a  slides against the strobe casing  41 , and, thus, the flash light-emitting unit  40  is moved in the optical axial direction to assume a state shown in FIG.  9 . By this movement, the irradiating angle of the flash light-emitting unit  40  is changed in synchronization with change in focal length. At that time, the first interrupting gear  13  and the like are in a state shown in FIG.  6 . 
     If the lens is moved from the telephotograph shooting position to the wide-angle shooting position, the branch gear  8  is turned in the counterclockwise direction in FIG.  6 . By this turning motion, the first interrupting gear  13  is turned in the counterclockwise direction and the second interrupting gear  14 , which is connected to the first interrupting gear  13  through the following spring  18 , is also turned in the same direction. By this turning motion of the second interrupting gear  14  in the counterclockwise direction, the control gear  19  and the driving gear  20  are turned in the clockwise direction in FIG. 6, and the rack  21  is lowered. By the lowering motion of the rack  21 , the exchanging plate  31  is lowered, and the driving plate  36  is lowered while advancing. Therefore, the flash light-emitting unit  40  is advanced through the input pin  40   a  which is guided by the cam hole  38  of the driving plate  36 . 
     The control gear  19  is turned in the clockwise direction in FIG. 6 until the lock portion  22   a  engages the lock lever  16 , and, thereafter, the control gear  19  and the second interrupting gear  14  are prevented from turning and only the first interrupting gear  13  is turned in the counterclockwise direction in FIG.  6 . This turning motion is allowed by a motion that the engaging projection  13   a  moves in the receiving groove  14   a . At that time, the power is accumulated in the following spring  18 . The action for retracting the barrel into the retracted position is as described above. 
     Although the above embodiment has been explained based on a case in which the camera includes the zoom lens device, it is possible to apply this pop-up strobe to a camera having a unifocal lens device. When this pop-up strobe is applied to a camera having a unifocal lens device, it is possible to use a mechanism which advances the barrel from the retracted position beyond the infinity shooting position which is the shootable position, and the barrel can be moved to a point-blank shooting position utilizing this mechanism. That is, when the camera is used for shooting, the barrel is advanced from the retracted position to the point-blank shooting position beyond the infinity shooting position and then, the barrel is retracted to the infinity shooting position and brought on standby for shooting. 
     As explained above, according to the camera including the pop-up strobe of the present invention, since the driving force of the pop-up mechanism is branched from the medium portion of the power transmitting path from the driving source to the barrel, it is unnecessary to separately prepare additional driving source for the pop-up mechanism. Therefore, the camera can be reduced in both weight and size. 
     According to the camera including the pop-up strobe of the invention described in the second aspect, the flash light-emitting unit can be provided with a sufficient driving distance when the barrel is popped up by moving the barrel forward from the shooting position. Therefore, a distance between the retracted position and the shooting position can be shortened, and this prevents the camera from being thickened. 
     According to the camera including the pop-up strobe of the invention described in the third aspect, the zoom device having the mechanism for advancing the lens forward from the wide-angle shooting position is applied to the camera. Therefore, it is unnecessary to separately prepare a mechanism for advancing the barrel forward from the shooting position, and the camera can easily be improved utilizing the existing structure. 
     According to the camera including the pop-up strobe of the invention described in the fourth aspect, the power accumulated in the power accumulating means is utilized for popping down the strobe light-emitting unit. Therefore, it is possible to reliably pop-down the strobe light-emitting unit irrespective of length of the moving distance of the barrel from the shooting position to the retracted position by accumulating the power in the power accumulating means halfway through the pop-up action. Further, since the power is accumulated halfway through the pop-up action, the power accumulating means is usually free. Therefore, it is possible to prevent the power accumulating means from becoming fatigued. 
     According to the camera including the pop-up strobe of the invention described in the fifth aspect, after the barrel was moved forward from the shooting position, the barrel is retreated to the shooting position, and the power is accumulated in the power accumulating means. When the barrel is retracted from the shooting position to the retracted position, the strobe light-emitting unit is popped down by the power accumulated in the power accumulating means. Therefore, the barrel can be moved forward freely. Thus, the barrel can be advanced from the shooting position to an arbitrary position, and the focal length of the lens held by the barrel can be changed. Further, since the moving preventing means is not released by the power acting when the barrel is moved forward from the shooting position, the power caused by this movement can easily be utilized for the zooming action of the flash light-emitting unit. 
     According to the camera including the pop-up strobe of the invention described in the sixth aspect, since the space for disposing the interrupting power transmitting element can be reduced to a minimum, it is possible to easily reduced the camera in size. 
     It will become apparent to those skilled in the art that various modifications to the embodiments of the invention as described herein can be made without departing from the spirit or scope of the invention as defined by the amended claims.