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:
Aug. 11, 1992
Filed:
May. 21, 1991
Applicant:
Inventor:
Ryoichi Imai, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
353 / ; 353 / ; 377 18 ; 250570 ; 250557 ;
Abstract
An information retrieval apparatus used in a microfilm reader, a reader/printer, or the like includes a first illuminator for illuminating information and a mark recorded on an information recording medium, a second illuminator for illuminating the mark, and a detector for detecting the mark illuminated by the second illuminator. The second illuminator includes a solid-state light-emitting element for emitting monochromatic radiation having a wavelength of visible light. A designator designates an optimal position of the detector on the basis of a position of the mark projected on a screen is arranged.