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. 02, 1988
Filed:
Aug. 04, 1986
Applicant:
Inventors:
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J / ; G03B / ;
U.S. Cl.
CPC ...
250201 ; 354403 ;
Abstract
In an automatic focus detecting device having a light projecting element for projecting light for focus detection onto an object to be photographed and a light receiving element for receiving the light reflected by the object, controls an imaging optical system moving to an in-focus position on the basis of an output signal of the light receiving element. The disclosed light emission quantity control device includes a counter for counting the light emission time of the light projecting element from the start thereof and increases the light emission quantity of the light projecting element after the lapse of a predetermined time counted by the counter.