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. 07, 1984
Filed:
Feb. 04, 1981
Applicant:
Inventors:
Masayoshi Yamamichi, Kanagawa, JP;
Yukio Iura, Kanagawa, JP;
Hiroshi Aizawa, Tokyo, JP;
Tadashi Ito, Kanagawa, JP;
Tetsuya Taguchi, Kanagawa, JP;
Tadanori Uchidoi, Kanagawa, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; G03B / ; G03B / ; G03B / ;
U.S. Cl.
CPC ...
354448 ; 354152 ; 354266 ; 3542711 ; 354484 ;
Abstract
A droppage in a power source voltage below a prescribed value is prevented by using an electro-magnetic device of low power consumption type in a single lens reflex camera, and at the same time when the power source voltage is lower than the prescribed value, an erroneous function prevent circuit is activated to make the control circuit of a camera electronically inoperative and an indication of warning is made.