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:
Jun. 13, 2023
Filed:
Dec. 04, 2019
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventors:
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09D 163/00 (2006.01); G02B 5/00 (2006.01); C03C 17/00 (2006.01); C08K 3/22 (2006.01); C09D 5/00 (2006.01);
U.S. Cl.
CPC ...
C09D 163/00 (2013.01); C03C 17/001 (2013.01); C03C 17/009 (2013.01); C08K 3/22 (2013.01); C09D 5/00 (2013.01); G02B 5/003 (2013.01); C08K 2003/2241 (2013.01);
Abstract
An optical element has a lanthanum-containing glass substrate and a light-shielding film on part of the surface of the glass substrate. The light-shielding film is made from a light-shielding paint that contains at least an epoxy resin, fine particles of titania, a dye, an organic solvent, and an amine-based curing agent. The organic solvent in the light-shielding paint has a vapor pressure of 160 Pa or more and 960 Pa or less at a temperature of 20° C. The viscosity of the light-shielding paint is 10.0 mPa·s or more and 100 mPa·s or less.