| 摘要 |
PROBLEM TO BE SOLVED: To provide an AF lens barrel having constitution that the rotational adjusting angle of an oscillatory wave motor or a manual adjusting angle can be freely set and giving optimum manual operational feeling. SOLUTION: In a full time manual mechanism having structure where the output ring of a progressive wave motor is meshed with the inside of one of planet gears divided into two in a thickness direction and each having frictional resistance, and a manual operating ring is meshed with the outside of the other, friction between two-divided planet gears is set smaller than the friction between the rotor and the stator of a motor, whereby driving force from the motor or manual operational force at the lens moving terminal of a lens moving ring is released by sliding rotation between the planet gears, and contact pressure between the rotor and the stator of the motor is independently adjusted in order to bring out maximum efficiency, and other driving systems are not influenced by such adjustment. |
