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. 08, 2025
Filed:
Oct. 04, 2022
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventors:
Kosuke Tabayashi, Azumino, JP;
Norikazu Kadotani, Azumino, JP;
Assignee:
SEIKO EPSON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B 21/20 (2006.01); G02B 26/00 (2006.01); G03B 21/16 (2006.01);
U.S. Cl.
CPC ...
G02B 26/008 (2013.01); G03B 21/16 (2013.01); G03B 21/204 (2013.01); G03B 21/2066 (2013.01);
Abstract
A phosphor wheel includes a wheel element including a disk-shaped substrate having a first surface and a second surface opposite from the first surface, an annular phosphor disposed at the first surface on a circle around the center of the substrate, and a plurality of fins disposed at the second surface and extending outward from the side facing the center of the substrate, and a balance corrector that corrects nonuniformity of the rotational balance of the wheel element, and the balance corrector includes a first balancer and a second balancer that is lighter than the first balancer.