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:
Sep. 15, 2009
Filed:
Oct. 05, 2004
Makoto Okada, Osaka, JP;
Kayoko Fujimura, Osaka, JP;
Makoto Okada, Osaka, JP;
Kayoko Fujimura, Osaka, JP;
Nalux Co., Ltd., Osaka, JP;
Japan Science and Technology Agency, Saitama, JP;
Abstract
A polarizing element usable for two wavelengths in a predetermined wavelength region and having a simple structure. The polarizing element has a two-layer structure in which a grid pattern of a constant period Λ having a triangular cross-section is formed on a substrate and a film with a refractive index higher than that of the substrate is deposited on the grid pattern. When first and second wavelengths λ, λsatisfy λ<λ, Λ cos θ<λwhere θis the angle of incidence on the grid surface. The grid period, the grid height, and the film thickness are determined so that with respect to the first wavelength λ, the reflection efficiency of the TE-polarized zero-order diffracted light is a predetermined value or more and the transmission efficiency of the TM-polarized zero-order diffracted light is a predetermined value or more and so that with respect to the wavelength λ, the transmission efficiency of the TE-polarized zero-order diffracted light is a predetermined value or more and the reflection efficiency of the TM-polarized zero-order diffracted light is a predetermined value or more.