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:
Feb. 14, 1978
Filed:
Jul. 14, 1975
Tsukumo Nobusawa, Tokyo, JA;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JA;
Abstract
This invention provides for automatically adjusting the diaphragm opening in a camera having a shutter operated in an automatic manner for controlling exposure time, so as to counteract such problems as the exposure time being adjusted to the point within its adjustability range at which slight hand movements result in a blurred photograph. A camera embodying the invention includes diaphragm driving circuitry responsive to a drive control signal, such as a sequence of drive pulses, supplied thereto, and a digital circuit arrangement for selectively applying the drive control signal to cause the diaphragm opening to be adjusted from a manual presetting thereof to a setting that, under prevailing lighting conditions, is consistent with an acceptable range of exposure times.