| 摘要 |
PURPOSE:To stop a filter to a prescribed position accurately, by stopping an optical filter disc drive motor through the coincidence between an optical filter disc position detecting signal and a position set signal. CONSTITUTION:A 3-circuit 5-contact switch circuit 201 sets the stop position of an optical filter disc of color temperature conversion or ND filter with one, two or more binary signals. An optical filter disc position detecting means 207' is provided corresponding to the optical filter disc. A control circuit 210' stops an optical filter disc drive motor 219, when the collector output of photo transistors 207-209 being the position detection means output coincides with the outputs 16-18 of a seraial parallel conversion circuit 203. |
