| 摘要 |
PURPOSE:To provide three modes: 'full-time manual', 'acceleration manual', and 'manual lock', in a lens barrel using a ultrasonic motor for an AF motor and capable of switching to the manual action without using a special switching means. CONSTITUTION:A manual action ring 4 is made slidable at three positions in the optical axis direction, and 'full-time manual' is realized by the coupling with a manual action input ring 17 at the middle position. When the manual action ring 4 is slid backward, 'acceleration manual' is realized by the coupling with a ring 20 serving as an output member. When the manual action ring 4 is slid forward, 'manual lock' is realized by the coupling with a friction washer 21. |
