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. 26, 2001
Filed:
Feb. 19, 1999
Kazuo Aoki, Chino, JP;
Yukihiro Endo, Nagano-ken, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A technique for improving properties of polarizing beam splitters and polarizing conversion elements, and a projection display apparatus having high light utilization efficiency using such polarizing beam splitters are provided. A polarizing beam splitter in accordance with the present invention includes a light transmissive substrate having a refractive index ranging from approximately 1.48 to 1.58, and a polarization separating film formed on the light transmissive substrate. The polarization separating film includes a multilayered structural section formed by alternately arranging MgF,layers and MgO layers. The polarization separating film in accordance with the present invention can improve the transmission property and the reflection property with respect to two types of polarized light. Also, by using the polarization separating film for a polarizing conversion element or a projection display apparatus, it is possible to provide a polarizing conversion element or a projection display apparatus having high light utilization efficiency.