| 摘要 |
PROBLEM TO BE SOLVED: To disuse a cam mechanism for zooming and to control all the means based on digital data by operating an entire moving means integrally moving front and rear groups and a relative moving means changing space between the front and the rear groups in the case a focusing operation means is operated so that a focal length may be set and in-focus operation may be performed. SOLUTION: When a driving ring 12 is rotated by an entire moving motor 18 moving the entire lens group, the front lens group L1 is moved in an optical axis direction and the rear group lens L2 is integrally moved with a front group supporting ring 13. When a driving screw shaft 22 is turned by a rear group moving motor 21, a rear group supporting ring 14 is moved relatively to the ring 13, and the space between the lenses L2 and L1 is changed. The motors 18 and 21 are respectively driven and controlled through motor control means 25 and 26, and when a focusing operation means 32 is operated, the motors 18 and 21 are actuated to bring a subject into focus. |
