1979-12-20
1981-09-22
Gonzales, John
354234, 354258, G03B 924
Patent
active
042906814
ABSTRACT:
A tortion coil spring is charged with a driving force for rotation in response to a film winding operation. When a start position regulating member is released from the shutter driving member, the shutter driving member is rotated by the driving force, till it runs against a shutter speed determining member. During said rotation, a connecting mechanism connected to the shutter driving member to be forward and backward reciprocated by the rotation of the shutter driving member makes a forward motion. Two shutter sectors connected to the connecting mechanism are moved by the forward motion to increase the area of an aperture as an exposure hole for a pencil of rays at the fixed rate by the function of a speed control mechanism. After stopped for a fixed time in response to the brightness of the light reflected from a foreground subject, the rotation of the shutter driving member is resumed. When the shutter driving member is released from the shutter speed determining member. Since simultaneously, the connecting mechanism makes a backward motion, the shutter sectors are moved by the backward motion to close the exposure hole immediately.
REFERENCES:
patent: 4118721 (1978-10-01), Hashimoto
patent: 4183646 (1980-01-01), Tsunefuji
Maitani Yoshihisa
Tsunefuji Katsuhiko
Gonzales John
Olympus Optical Co,. Ltd.
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