| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens barrel having a motive power transmitting mechanism by which automatic focusing is attained by a motor by transmitting driving force from the motor to a focusing barrel at the time of automatic focusing, and the driving force from a manual focusing barrel is transmitted to the focusing barrel without performing switching operation and also the driving force from the manual focusing barrel can not be transmitted to the motor side at the time of manual focusing. SOLUTION: The automatic focusing barrel is separated into the automatic focusing barrel 6 and a driving ring 10 receiving the driving force of the motor 11, and a pair of springs A and B different in winding direction are inserted and fitted to the ring 10, thus a focusing barrel 5 is moved in an optical axis direction through the ring 10, the springs A and B and the barrel 6 at the time of motor-driven focusing, and the barrel 5 is moved in the optical axis direction through the springs A and B and the barrel 6 and also manual driving force is prevented from being transmitted to the motor side at the time of manual focusing. |
