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:
Dec. 13, 2016
Filed:
Jun. 18, 2015
Canon Kabushiki Kaisha, Tokyo, JP;
Shuichi Kurokawa, Saitama, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
The imaging optical element includes an optical surface whose shape within a sub-scanning section has a non-circular shape. Assuming that a coordinate along a main scanning direction is Y and a coordinate along a sub-scanning direction is Z and that, within the sub-scanning section, a curvature radius on an optical axis of the optical surface is r, an eccentricity is k, a coefficient of variation in the curvature radius of the optical surface is D, and an aspherical surface coefficient is GY, when a shape S of the optical surface within the sub-scanning section is defined by an expression: the expression includes a term in which n is an odd number equal to or larger than 3, and the aspherical surface coefficient of at least one of the terms in which n is an odd number equal to or larger than 3 is changed asymmetrically along the main scanning direction.