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:
Jun. 16, 1987
Filed:
Dec. 10, 1984
Applicant:
Inventors:
Takashi Amikura, Tokyo, JP;
Akihiro Fujiwara, Kanagawa, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
250201 ; 250204 ;
Abstract
In the disclosed automatic focus adjusting device of the active type having a light emitting element for projecting light for focus detection onto an object to be photographed, light emitting operation and non-light emitting operations of the light emitting element are periodically effected, and the duty ratio or frequency of the light emitting period is variable.