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. 11, 2020
Filed:
Jul. 31, 2017
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Kei Ueda, Atsugi, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/02 (2006.01); G03B 11/00 (2006.01);
U.S. Cl.
CPC ...
G02B 5/0257 (2013.01); G02B 5/0268 (2013.01); G03B 11/00 (2013.01);
Abstract
An optical element includes an optical surface with a random uneven shape that satisfies 0.30≤I≤1.00 and 0.00≤C≤0.60 where P is an average pitch, Iis a ratio of a component intensity sum from 0.9P to 1.1P to a component intensity sum of an entire frequency spectrum calculated with a square area in which each side is equal to or longer than 40 μm, and Cis a value of a second largest intensity peak in an autocorrelation function calculated with a square area in which each side is 20P.