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:
Aug. 09, 1988
Filed:
Jan. 13, 1987
Hajime Oda, Yotsukaido, JP;
Hiroyuki Saito, Yotsukaido, JP;
Keiji Arai, Yotsukaido, JP;
Atsushi Misawa, Yotsukaido, JP;
Toshiya Tamura, Yotsukaido, JP;
Michio Taniwaki, Yotsukaido, JP;
Katsuhito Niwa, Yotsukaido, JP;
Seikosha Co., Ltd., Tokyo, JP;
Abstract
A camera has a shutter device driveable to undergo opening movement to open an aperture to effect exposure operation according to a given exposure value, and a motor actuatable to rotate at an unstable rotational speed for driving the shutter device. A detector operates after the motor starts rotating and before the shutter device undergoes its opening movement for detecting the rotational speed of the motor. A controller adjusts the shutter device in accordance with the detected rotational speed of the motor to thereby enable the shutter device to effect the exposure operation so as to accurately achieve the given exposure value.