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:
Jul. 31, 2012
Filed:
Mar. 19, 2010
Masayuki Oto, Zama, JP;
Masayuki Oto, Zama, JP;
Seiko Epson Corporation, , JP;
Abstract
A laminated wave plate includes a first wave plate with a phase difference of Γ=180° with respect to a designed wavelength λand a second wave plate with a phase difference of Γ=180°, in which the first wave plate and the second wave plate are arranged and laminated so that optical axes thereof intersect each other, the laminated wave plate converting an incident linearly-polarized beam into a linearly-polarized beam obtained by rotating a polarization plane of the incident linearly-polarized beam by a predetermined angle φ and outputting the converted linearly-polarized beam. When in-plane bearing angles formed by the polarization plane of the incident linearly-polarized beam and optical axes of the first and second wave plates are represented by θand θand an optical axis adjustment amount is represented by a, the following expressions are satisfied: θ=φ/4+a; and θ=3φ/4−a.