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:
May. 29, 2007
Filed:
Apr. 20, 2004
Masayuki Ooto, Kouza-gun, JP;
Masayuki Ooto, Kouza-gun, JP;
Toyo Communication Equipment Co., Ltd., Kanagawa, JP;
Abstract
As a ½ wave plate constituted by laminating two wave plates, a wave plate where temperature dependence of a phase difference is reduced is provided. In a wave plate constituted by laminating a first wave plate having a phase difference τ(deg.) and an optical axis azimuth θ(deg.), and a second wave plate having a phase difference τ(deg.) and an optical axis azimuth θ(deg.), the phase difference τ(deg.) of the first wave plate and the phase difference τ(deg.) of the second wave plate are set to 360n+180 (n=0, 1, 2 . . . ), and an angle formed by polarization planes of incident light and emitted light is θ (deg.). In this case, the first wave plate and the second wave plate are laminated so as to satisfy θ=(90+θ/2)/2 and θ=θ+90+θ/2.