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:
Feb. 22, 2011
Filed:
Sep. 28, 2006
Applicant:
Masayuki Oto, Zama, JP;
Inventor:
Masayuki Oto, Zama, JP;
Assignee:
Epson Toyocom Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A laminated plate having a wider bandwidth at a desired retardation is provided. A laminated wave plateincludes a first wave plateand a second wave platethat are laminated to each other so that respective optical axes of the first wave plate and the second wave plate intersect each other at an angle of 51.5 degrees when the first wave plate has a retardation Γof 360 degrees and an in-plane azimuth of −8 degrees, while the second wave plate has a retardation Γand an in-plane azimuth of 43.5 degrees. Thus, the laminated wave platefunctions as a desired retardation Γin a wavelength from 600 nm to 800 nm as a whole.