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. 11, 2002
Filed:
Jun. 22, 2000
Kazuo Aoki, Chino, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
To provide a polarization conversion element which makes it possible to achieve high production efficiency. A polarization conversion element in accordance with the present invention includes a plurality of transmissive members arranged along a predetermined direction, and a plurality of polarization separation films and a plurality of reflection films alternately disposed between the plurality of transmissive members. In each polarization separation film, a transmittance ratio for an ultraviolet light beam of a particular wavelength range which is incident on a surface of each polarization separation film at an angle of incidence of approximately 0 degrees is approximately 40% or more. Each reflection film may be formed so that its transmittance ratio for an ultraviolet light beam of a particular wavelength range which is incident on a surface of each reflection film at an angle of incidence of approximately zero degrees is approximately 40% or more.