| 摘要 |
PURPOSE:To increase shutter speed, by securing the optimum driving method for a pulse motor. CONSTITUTION:The shutter disk 3 is mounted to the rotary shaft 2 of the pulse motor 1 via the shutter disk attaching boss 4. Then the motor 1 is driven to give a rotation to the disk 3. Thus the optical aperture part (slit 31) of the disk 3 is rotated to give a passage or cut-off to the flux of light shown by the arrow. The motor 1 is controlled and driven by the shutter control driving circuit. This driving circuit gives a shutter action that completes in N steps to the pulse motor, and the position of completion is detected for the 1st step to the (n-2) the step and the Nth step respectively. Based on this detection output, the control driving pulse is supplied to the pulse motor. |
