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:
Dec. 14, 1982
Filed:
Jan. 26, 1977
Yoshiyuki Takishima, Yokohama, JP;
Yukio Mashimo, Tokyo, JP;
Masanori Uchidoi, Yokohama, JP;
Hiroshi Aizawa, Kawasaki, JP;
Bernhard H Andresen, Dallas, TX (US);
Robert C Martin, Dallas, TX (US);
Stephen C Kwan, Plano, TX (US);
Canon Kabushiki Kaisha, Tokyo, JP;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A storage device for storing photographic exposure information employs a closed-loop analog-to-digital (A-D) converter circuit includes a counter and a digital-to-analog (D-A) converter. The influence of erroneous signals which are created at the output of the D-A converter when the exposure information is stored in the counter is eliminated. The D-A converter circuit employs a ladder network of coarse accuracy. The stored exposure value, however, is highly accurate because of the closed-loop nature of the A-D converter circuit. Means responsive to the stored value for operating the exposure system of the camera are disclosed.