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. 26, 1980
Filed:
Dec. 21, 1978
Yukio Takaoka, Asaka, JP;
Masahiro Kawasaki, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A self-timer in a camera which has a shutter priority automatic exposure adjustment (EE) mode, a manual exposure adjustment mode or an aperture priority automatic exposure adjustment (ES) mode, or all three exposure adjustment modes. In the (EE) mode, light passing through a lens aperture is received by a light receiving element while the lens aperture is being stopped down. When an aperture value (the quantity of light) suitable for the preset shutter speed and film sensitivity is obtained the supply of current of an aperture control magnet having attracted an aperture locking lever is interrupted to lock the operation of the aperture thereby to determine an aperture value. Simultaneously the locking of a top curtain is released by the lever. The camera has an interlocking timer circuit in which, in modes other than the (EE) mode, the supply of current to the aperture control magnet is interrupted in a period of time such that a period of time required for stopping down the aperture to its minimum aperture value is made slightly longer, thereby to release the top curtain. A switch for changing the time constant of the interlocking timer circuit is provided to increase the operating time of the interlocking timer circuit.