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:
Jun. 17, 2025
Filed:
Mar. 30, 2022
Seiko Epson Corporation, Tokyo, JP;
Hirotaka Yanagisawa, Azumino, JP;
SEIKO EPSON CORPORATION, Tokyo, JP;
Abstract
An attachment optical system is detachably attached to a magnification side of a projection optical system of a projection display device, and projects light emitted from the projection optical system on an imaging plane different from a magnification side imaging plane of the projection optical system. The attachment optical system includes an optical element having a second optical axis as an extension of a first optical axis of the projection optical system. The optical element has a plane of incidence on the second optical axis, a first reflecting surface that reflects light emitted from the plane of incidence, a second reflecting surface that reflects light reflected by the first reflecting surface, and an exit surface that transmits light reflected by the second reflecting surface. The first reflecting surface and the exit surface are continuous in an axial area where light passes the second optical axis and the first optical axis.