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. 08, 2000
Filed:
Dec. 09, 1998
Applicant:
Inventor:
Hiroyuki Kunugi, Kanagawa-ken, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359204 ; 347241 ; 347243 ;
Abstract
The multi-beam optical unit of the invention limits the number of reflection times by half mirrors to one time or below when a plurality of beams are combined into one and guided to a polygon mirror, so that an influence upon an image due to a positioning error of the half mirrors can be minimized. Besides, power of emitted beams can be made uniform by using the half mirrors having transmissivity and reflectance satisfying predetermined conditions regardless of the number of times that the beams penetrate the half mirrors. Thus, the service lives of a plurality of beam emitting sources can be made uniform, and maintainability can be improved.