The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 22, 1981
Filed:
Dec. 20, 1979
Yoshihisa Maitani, Hachioji, JP;
Katsuhiko Tsunefuji, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
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.