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:
May. 17, 2022
Filed:
Nov. 25, 2019
Canon Kabushiki Kaisha, Tokyo, JP;
Yoshihisa Kawamura, Yokohama, JP;
Hideki Ina, Tokyo, JP;
Ryo Yoshida, Kawasaki, JP;
Yukinobu Suzuki, Koza-gun, JP;
Koji Hara, Ichikawa, JP;
Yoshiyuki Nakagawa, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A curved surface constituting a convex surface or a concave surface of each of a plurality of lenses includes at least a silicon nitride layer and another silicon nitride layer. An interlayer having a composition different from a composition of the silicon nitride layer and a composition of the other silicon nitride layer is arranged between the silicon nitride layer and the other silicon nitride layer, and a thickness of the interlayer is less than a thickness of the silicon nitride layer and a thickness of the other silicon nitride layer.