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. 25, 1977
Filed:
Sep. 03, 1975
Applicant:
Inventors:
Chiharu Mori, Tokyo, JA;
Masahiro Kawasaki, Tokyo, JA;
Assignee:
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JA;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
356226 ; 354 / ;
Abstract
An exposure meter circuit is disclosed in which the photoreceptor may be either a photovoltaic element such as a photodiode or a photoconductive element such as a CdS element. The meter is able to provide an indication of various exposure determining factors such as object brightness, shutter speed, aperture, or a fixed point for alignment by appropriate choice of circuit values.