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. 15, 1980
Filed:
Jun. 29, 1978
Applicant:
Inventor:
Kenji Fukuoka, Fussa, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; G03B / ;
U.S. Cl.
CPC ...
354 25 ;
Abstract
An automatic focusing device for cameras, microscopes and the like for automatically adjusting the focal point of a lens with the aid of an operational circuit. The operational circuit derives brightness information of adjacent picture elements, calculates differences in picture element brightness from this brightness information, and aids in the smoothness of brightness change associated with this difference for a number of picture elements. An accumulated value of this smoothness of brightness change is obtained for all picture elements, and the optical system is moved to make the accumulated value a maximum and to adjust the focal point accordingly.