Shutter driving device

Abstract

Abstract PURPOSE:To simplify the constitution of a shutter driving device by controlling the driving of a motor for rotating a shutter driving ring by a microcomputer according to a specific driving program. CONSTITUTION:When the shutter is released and a release switch 55 is turned on, a brightness detecting circuit 51 operates to detect subject brightness. An MPU 46 refers to a brightness data ROM 48b on the basis of the subject brightness information and stores the number PS of pulses corresponding to the subject information in a specific address of a RAM 49. Then, a distance measuring instrument 50 operates to detect the subject distance and the number PL of pulses corresponding to the distance is also stored in a specific address of the RAM 49. When forward rotation pulses are supplied to a driver circuit 53, a stepping motor 13 begins to rotate forward at timing T1 in a time chart, so that a shutter driving ring 3 rotates counterclockwise and a clutch lever 7 itself rotates. Consequently, the constitution of a clutch mechanism is simplified greatly.

Inventors

• 👤 Kiyotaka Kobayashi
• 👤 清隆 小林
• 👤 Yutaka Yoshida
• 👤 豊 吉田

Bibliographic Details