| 摘要 |
<p>PURPOSE:To reduce the time lag up to actual exposure after the shutter is released by performing arithmetic within the mechanism operation delay time up to the start of the elevation of a mirror after power supply to mirror motor. CONSTITUTION:A switch information input part 26 outputs pieces of information on a mirror-up switch 95, a mirror down switch 96, a file switch 97, and a release switch 98 to a central processing unit 11. A leading-curtain magnet 27 controls the holding/travel start of the leading curtain with the signal from the central processing unit 11. A trailing-curtain magnet 28 controls the holding and travel start of the trailing curtain with the signal from the central processing circuit 11. When a movable mirror is elevated by powering ON a mirror motor 36, pulses which are inputted from a photocoupler 32 for EE pulse control to the pulse counter 13 of the central processing circuit 11 through a peripheral circuit 19 are counted and a stop control magnet 29 drives an EE magnet with a signal outputted when a specific counted value is reached to stop stopping-down operation.</p> |
