| 摘要 |
PURPOSE:To minimize the time required for focusing, and to obtain exact shutter timing by operating unitedly a lens driving member and a lens positioning member, so that a rotation of a step cam and movement of a photographic lens are executed simultaneously. CONSTITUTION:A titled device is constituted so that a cam groove of a lens driving member 40 to which a guide pin of a photographic lens for going straight on in the optical axis direction has been engaged so as to be slidable is provided in parallel to a step cam 31 of a lens positioning member 30 and also at a position separated a little in the optical axis direction, both of them are operated unitedly so that a rotation of the step cam 31 and a movement of the photographic lens are executed simultaneously, the lens positioning member 30 is stopped by a signal of a control device, and thereafter, only the lens driving member 40 is operated and immediately a pin of the photographic lens is made to abut on the step cam 31, and the focusing is executed. In this state, the lens driving member 40 and the lens positioning member 30 is stopped, and thereafter, the lens driving member 40 is stopped at a position determined by the lens positioning member 30, by which the time required for focusing can be shortened. |
