| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens barrel by which a differential mechanism required for a full-time manual function is easily formed by imparting friction to a manual operation ring. SOLUTION: The manual operation ring 2 is attached so as to be freely rotatable by 360 deg. by the outside diameter of a front cover 1 and a roller attached at the outside diameter of the front cover 1. Also, a gear is threaded at an inside diameter, and is linked with epicyclic pinions 12a and 12b. Also, it is pressed in a radial direction by a spring part 1a provided at the front cover 1, so that a specified load is applied to rotation. |
