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:
Sep. 10, 2013
Filed:
Jul. 28, 2010
Hidekazu Shimomura, Yokohama, JP;
Hidekazu Shimomura, Yokohama, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A light scanning apparatus comprises a light source unit, a deflection unit, an incident optical system, and an imaging optical system including a transmission type imaging optical element and a reflection optical element are provided. A light beam deflected for scanning by the deflection unit passes through the imaging optical element in order of a first and a second transmission surfaces, and then passes through the imaging optical element again a third and fourth transmission surfaces. The first and fourth transmission surfaces of the imaging optical element are different in shape from another in the sub-scanning direction. Respective components are set so that, in a sub-scanning section, the light beam deflected for scanning is turned back by the reflection optical element and refracted/diffracted at the first transmission surface in a direction in which a reflected light beam passes through the third transmission surface, and that predetermined Conditional Expression is satisfied.