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:
Mar. 19, 1996
Filed:
Oct. 19, 1994
Applicant:
Inventor:
Keiji Ohsawa, Tokyo, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354406 ; 354407 ; 354408 ; 2502011 ;
Abstract
A focus detection device includes an infrared reduction filter positioned behind the field lens between, the field lens and any secondary imaging lenses. Preferably, the infrared reduction filter is positioned closely adjacent to the field lens, i.e., closer to the field lens than to the secondary imaging lenses, usually between the field lens and any deflection mirror that might be located between the field lens and the secondary imaging lenses.