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. 27, 2017
Filed:
Jan. 21, 2016
Seiko Epson Corporation, Tokyo, JP;
Naoto Takehana, Matsumoto, JP;
SEIKO EPSON CORPORATION, Tokyo, JP;
Abstract
In a projection optical apparatus, a refractive system includes a plurality of lens groups, one of which includes a first lens located in a position closest to a reflective system and a first lens frame having an accommodation section that accommodates the first lens. The first lens has a lens cutoff section, and the accommodation section has a wall section that is located outside the lens cutoff section and a first opening section that exposes a side surface of the first lens that is opposite the lens cutoff section. The wall section is provided with an open section that exposes the lens cutoff section. A guide barrel is so formed as to expose the first opening section and the open section. A projection optical apparatus enclosure has a second opening section that exposes the first opening section and is configured to be capable of exposing the open section.