| 摘要 |
PURPOSE:To precisely control a focusing position with a simple constitution by deciding the initial position of a focus lens according to the rotating position of the final stage gear in a gear mechanism provided between a motor and a focus lens, respectively controlling the motor and setting the initial position in case of controlling a focusing position. CONSTITUTION:The initial position of the focus lens 1 is decided according to the locking of a lock piece 10 equipped on a switching ring 8 which is the final stage gear in the reduction gear mechanism 3 with a stopper 11 equipped in a radial direction of the switching ring 8. In case of controlling the rotating quantity of the motor 4, the motor 4 is reversely rotated to the initial position where the lock piece 10 is locked by the stopper 11. Thus, a switch for setting the initial position is not necessitated and the precise control of focusing position can be attained. |
