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:
Oct. 08, 2019
Filed:
May. 18, 2018
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventors:
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 1/11 (2015.01); G02B 5/00 (2006.01); G02B 27/00 (2006.01);
U.S. Cl.
CPC ...
G02B 1/11 (2013.01); G02B 5/003 (2013.01); G02B 27/0018 (2013.01);
Abstract
An optical element includes an optically effective surface and an optically non-effective surface, and a light-shielding coating film is formed on the optically non-effective surface. The optically non-effective surface includes a round-chamfered concave step corner section, the light-shielding coating film is formed over the entire concave step corner section, the light-shielding coating film has a raised area near a location where one of planes of the concave step corner section is connected to the round chamfer. Consequently, film cracking of the optically non-effective surface of a stepped shape is inhibited and a reliable optical element is provided.