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:
Aug. 10, 2021
Filed:
Jul. 29, 2019
Seiko Epson Corporation, Tokyo, JP;
Eiji Morikuni, Matsumoto, JP;
SEIKO EPSON CORPORATION, Tokyo, JP;
Abstract
A projection system is formed of a first optical system and a second optical system sequentially arranged from the demagnifying side toward the magnifying side and forms a first intermediate image and a second intermediate image in positions between a demagnifying-side image formation plane and a magnifying-side image formation plane of the projection system. The second optical system is a lens. The lens has a first transmissive surface, a reflective surface, and a second transmissive surface. The reflective surface has a concave shape, and the second transmissive surface has a convex shape protruding toward the magnifying side. An imaginary line specified in the lens inclines with respect to an imaginary vertical line perpendicular to the imaginary axis in a plane YZ, and the intermediate image is located between the first transmissive surface and the reflective surface.