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:
Jul. 12, 2022
Filed:
Nov. 14, 2019
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Satoshi Yokoyama, Chigasaki, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/18 (2006.01); G02B 5/20 (2006.01);
U.S. Cl.
CPC ...
G02B 5/18 (2013.01); G02B 5/203 (2013.01);
Abstract
A diffractive optical element having, on a surface of a transparent substrate, a plurality of types of regions which provide different phase modulation to an incident light, wherein each of the regions has a microstructure formed with concave and convex portions of which sizes are smaller than the wavelength of the incident light, and wherein in the microstructure, a ratio of the width of the convex portion and the width of the concave portion in the concave and convex portions and the depth of the concave portion are different for each type of region.