Electromagnetically driven shutter in camera

Abstract

Abstract PURPOSE:To reduce the stroke of a moving member and to reduce electric power consumption and the time required for resetting the moving member by inverting the moving member by a focusing detection signal in a focusing region and a object brightness signal in an exposing adjustment region. CONSTITUTION:A driving plate 1 is run further toward the right and a switch S2 for changing over a moving direction is opened by a projection 1c to interrupt the conduction of electricity between a light emitting element 6a and an electromagnet 7e to invert a step motor 3 unless a bisected sensor 8 does not detect a focusing point during the focusing stroke. On the other hand, the signal is inputted to a control circuit when the sensor 8 detects the focusing and outputs the focusing signal. Said circuit inverts the output pulses and interrupts at the same time the conduction of electricity to the element 6a and the electromagnet 7e to run the plate 1 in the opposite direction from the midway of the stroke via a motor 3, thereby moving said plate to the exposing stroke region. The control circuit begins to output in succession the pulses of the number corresponding to the object brightness which is preliminarily detected, thereby moving leftward the plate 1 and turning a sector lever 4 in a counterclockwise direction by a cam face if. The opening operation of the sector is executed by the other end thereof.

Inventors

• 👤 Masuo Ogiwara
• 👤 荻原　倍男
• 👤 Hiroaki Ishida
• 👤 石田　廣明
• 👤 Shinji Nagaoka
• 👤 伸治 長岡
• 👤 Koji Sato
• 👤 幸治 佐藤

Bibliographic Details