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:
Jan. 08, 1980
Filed:
Oct. 30, 1978
Eiichi Tano, Kamifukuoka, JP;
Shinji Urata, Tachikawa, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An indication device in a single lens camera of through-the-lens automatic exposure control type. The device comprises an aperture control device for controlling an aperture value by utilizing an object brightness (B), a film sensitivity (S) and a manual shutter speed (T). Also, a shutter control device is employed in which stopped-down metering is carried out by using an aperture value (A) controlled by the aperture control device. An actual aperture value controlled by the aperture value (A) and a shutter speed are automatically set according to the object brightness and film sensitivity to have a suitable exposure value according to the following equation: