| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a noise from producing in an electromagnetic clutch, when changing over manual operation drive and servo drive of optical regulating means by the electromagnetic clutch. SOLUTION: In this optical device, the manual drive of the optical regulating means is possible by a manual operation input to a manual driving member 3, and the servo drive is possible by driving torque transmission from a servo driving system 5 to the manual driving members. The optical device is provided with the electromagnetic clutch 6 having an input side member 19 connected to the servo driving system, and an output side member 20 outputting a driving force transmitted from the input side member, to the manual driving member, so that the input side member and the output side member are brought in contact together by action of an electromagnetic force generated by energizing under a contact pressure depending on energizing value, the input side member and output side member being brought in contact together, despite of energizing/ non-energizing the electromagnetic clutch.</p> |
