| 摘要 |
PURPOSE:To obtain a thin lens shutter camera by constituting the mechanism so that focusing may be performed with the aid of the collapsibility of a mirror frame and the movement of a lens frame which is provided to advance and retreat in the mirror frame by one motor. CONSTITUTION:By driving the motor 13, a screw 12 is rotated but a gear 11 is not rotated, consequently the mirror frame 3 is moved in a B direction. When a stopper 3a provided in the mirror frame 3 abuts on a body 1, the feeding of the mirror frame 3 is finished and the mirror frame 3 is set at an infinity position where photographing can be possible. When it reaches the infinity position, the gear 11 can not be moved in the B direction and the load in the mirror frame 3 becomes lighter than the load with which the mirror frame 3 is moved in the B direction and the screw 12 and the gear 11 begin to integrally rotate. When a gear 10 rotates, a cam 9 rotates and pushes up the projecting part 5a of the lens frame 5 on which the cam 9 abuts in the B direction. Under a usage condition, a necessary driving current is supplied to the motor 13 from a focal distance adjustment and control circuit, and focusing is performed. Thus, the constitution of the device is simplified and the thickness of a body at the time of housing is made thin. |
