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:
Jan. 31, 2012
Filed:
Mar. 19, 2010
Masayuki Oto, Zama, JP;
Masayuki Oto, Zama, JP;
Seiko Epson Corporation, , JP;
Abstract
A laminated half-wave plate includes: first and second wave plates having optical axes intersecting each other, wherein when phase differences of the first and second wave plates with respect to a wavelength λ are represented by Γand Γ, in-plane bearing angles formed by a polarization plane of a linearly-polarized beam incident on the laminated half-wave plate and the optical axes of the first and second wave plates are represented by θand θ, an angle formed by the polarization directions of the linearly-polarized beams incident on and emitted from the laminated half-wave plate is represented by φ, and an optical axis adjustment amount is represented by a, the following expressions are satisfied: Γ=180°+n×360°; Γ=180°+n×360° (where n in Γand Γis a non-negative integer); θ=φ/4+a; and θ=3φ/4−a.