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:
Jul. 13, 1993
Filed:
Jan. 10, 1991
Applicant:
Inventor:
Tadayuki Kirigaya, Tokyo, JP;
Assignee:
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354400 ;
Abstract
An automatic focusing device by which a focusing lens is operated in accordance with an object distance measured by a distance measuring unit. The distance of an object in a distance measuring zone provided in a view finder is determined to detect an abrupt change thereof. If the object distance is abruptly changed, the focusing lens is not operated to focus on a new object appearing in the measuring zone. Conversely, if the object distance is not abruptly changed, the focusing lens is operated to again focus on the object in the measuring zone.