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:
Apr. 13, 1993
Filed:
Aug. 30, 1990
Takumi Kobayashi, Tokyo, JP;
Kiyoshi Kawano, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A shutter device of a camera which includes first and second sector mechanisms which constitute a lens shutter and which are independently opened and closed to define an aperture. A photometer, for detecting the luminance of an object to be photographed, and a diaphragm controller for controlling the aperture defined by the second sector mechanism, in accordance with luminance data detected by the photometer, are provided. A shutter opening element is provided which normally closes the first sector mechanism and opens the first sector mechanism when the second sector mechanism is held to define a predetermined aperture determined by the diaphragm controller, and a shutter closing element is provided which closes the second sector mechanisms at a predetermined timing in accordance with the luminance data of the photometer after the first sector mechanism is opened by the shutter opening element.