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:
Mar. 29, 1977
Filed:
Jul. 07, 1975
Applicant:
Inventors:
Akira Takahashi, Tokyo, JA;
Masamichi Furukawa, Kawasaki, JA;
Assignee:
Ricoh Co., Ltd., Tokyo, JA;
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; G03B / ; G03B / ;
U.S. Cl.
CPC ...
354 / ; 354 / ; 354 / ;
Abstract
A memory device is provided for storing a photometric quantity that is sensed and photoelectrically converted, by a light receiving element disposed in the light path of the finder of a single lens reflex camera, and used for determining a shutter speed or exposure time, which device includes an analogue-digital converter for conversion of the photometric quantity into a digital quantity, and which converter includes a digital-analogue converter having a plurality of storage elements which correspond in number to one more than the number of manually settable change-over steps of the shutter speed.