| 摘要 |
PURPOSE:To stop a moving member properly by detecting the moving state of a moving body for exposure and changing the braking force of a braking means of the moving member by an output from the detecting means. CONSTITUTION:After being kept at the on state for a prescribed period in order to make an optical system go ahead, an advancing clutch 12 is turned off and then a rear clatch 13 is turned on. An optical system stopping position sensor 14 checkes the optical system, and when detecting the optical system, turns off a rear clatch 13. To determine the supporting point position of a spring to be acted as the braking force at the stop of the optical system, inputs from a pressure sensor 16 to the input ports A0-A3 of a microcomputer 31 are successively checked and a flag F/D to reset the supporting point position to a proper supporting point position D is set up to stop the optical system properly. |
