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:
Oct. 03, 2023
Filed:
Aug. 30, 2021
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventor:
Hirotaka Yanagisawa, Azumino, JP;
Assignee:
SEIKO EPSON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 13/18 (2006.01); G03B 21/28 (2006.01); H04N 9/31 (2006.01);
U.S. Cl.
CPC ...
G02B 13/18 (2013.01); G03B 21/28 (2013.01); H04N 9/312 (2013.01); H04N 9/3105 (2013.01); H04N 9/3179 (2013.01);
Abstract
An optical system forms an intermediate image between a reduction-side conjugate plane and a enlargement-side conjugate plane. The optical system includes a first optical system and a second optical system including a lens and disposed on the enlargement side of the first optical system. The lens has a first transmission surface, a reflection surface disposed on the enlargement side of the first transmission surface, and a second transmission surface disposed on the enlargement side of the reflection surface. At least one of the reflection surface and the second transmission surface is a free-form surface.