| 摘要 |
PURPOSE:To improve the traveling reliability of a shutter by starting the traveling of the shutter when a motor is turning stably after the lapse of its rise time and then to realize the miniaturization on the shutter with a reduction of the motor load by setting the shutter traveling that has no relation with the film winding. CONSTITUTION:A motor driving shutter consists of the 1st clutch mechanism which drives the 1st and 2nd ratchet wheels 10 and 11 with a built-in motor 1 and then advances the front curtain 6 with engagement to the wheel 10, an electromagnetic device (trigger switch 20, electromagnet 23, etc.) which works after detecting the traveling of the curtain 6 and after the lapse of the set time, the 2nd clutch mechanism which is energized by the electromagnetic device and engages with the 2nd wheel 11, etc. A mirror is raised up during the rise time of the motor 1, and the wheel 10 engages with the clutch mechanism with a rise end signal to drive the curtain 6. The traveling of the curtain 6 is detected by the electromagnetic device. Then the wheel 11 engages with the 2nd clutch mechanism after a prescribed period of time elapse to drive the rear curtain. |
