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. 07, 1990
Filed:
Mar. 22, 1989
Applicant:
Inventor:
Kazuhiro Takahashi, Kawasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F21V / ; F21V / ; G02B / ;
U.S. Cl.
CPC ...
2502011 ; 250205 ; 350469 ; 362268 ;
Abstract
An illuminating optical device including: a light source for emitting a light beam; and an illuminating optical system for receiving the light beam from the light source to irradiate an object with the light beam, the illuminating optical system having an optical axis and an illuminance-distribution changing lens system which is movable in the direction of the optical axis to change an illuminace-distribution forming characteristic of the illuminating optical system.