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:
Feb. 24, 2015
Filed:
Nov. 10, 2011
Applicants:
Daigo Kobayashi, Tokyo, JP;
Wataru Kikuchi, Warabi, JP;
Inventors:
Daigo Kobayashi, Tokyo, JP;
Wataru Kikuchi, Warabi, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 7/02 (2006.01); G02B 3/00 (2006.01); B29B 11/00 (2006.01); B29D 11/00 (2006.01);
U.S. Cl.
CPC ...
G02B 3/00 (2013.01); G02B 7/02 (2013.01); B29D 11/0073 (2013.01);
Abstract
To provide a plastic optical element with reduced birefringence. An angle formed by a line segment that connects a gate corresponding part of a core lens to the center of the core lens and a line segment that connects a gate corresponding part of a molded portion to the center of the core lens is greater than or equal to 90 degrees and is less than or equal to 180 degrees when viewed in a direction along the optical axis of the plastic optical element.