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:
Apr. 07, 2015
Filed:
Dec. 07, 2011
Shuho Kobayashi, Matsumoto, JP;
Mitsuru Miyabara, Matsumoto, JP;
Makoto Sakurai, Okaya, JP;
Seiko Epson Corporation, Suwa-shi, Nagano, JP;
Abstract
A polarization separation device includes a transmissive substrate formed of crystalline material having a birefringent property and an optical rotatory property, and a polarization separation portion that is provided on an incidence-side surface of the transmissive substrate and transmits P-polarized light and reflects S-polarized light. A reflective element, which reflects the S-polarized light reflected by the polarization separation portion, is disposed substantially in parallel with the transmissive substrate. A phase difference plate is disposed at an emission-side of the transmissive substrate. The P-polarized light, which is transmitted through the polarization separation portion and is incident to the transmissive substrate, is made to be emitted from an emission-side surface of the transmissive substrate while maintaining a polarization plane thereof, and the polarization plane of the P-polarized light transmitted through the transmissive substrate is converted to be as S-polarized light in the phase difference plate.