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:
Jan. 31, 2017
Filed:
May. 08, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Maiko Niwa, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A laminated diffraction optical element includes a substrate, and a resin layer provided on the substrate and including an optically effective portion and an optically non-effective outer portion adjacent to the optically effective portion. The optically non-effective outer portion in the resin layer has a continuous shape such that a layer thickness decreases when extending toward an outer periphery of the substrate. An angle formed between a straight line connecting both ends of the continuous shape and a tangent to a surface of the substrate at a point opposite to an end closer to the surface of the substrate is within a range of 20 to 60 degrees.