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. 26, 2015
Filed:
Jun. 22, 2012
Applicant:
Jun Amako, Tsurugashima, JP;
Inventor:
Jun Amako, Tsurugashima, JP;
Assignee:
Seiko Epson Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J 3/28 (2006.01); G02B 27/42 (2006.01); G01J 3/18 (2006.01); G01J 3/44 (2006.01); G02B 5/18 (2006.01); G01J 3/02 (2006.01);
U.S. Cl.
CPC ...
G02B 27/4261 (2013.01); G01J 3/18 (2013.01); G01J 3/44 (2013.01); G02B 5/1871 (2013.01); G02B 27/4272 (2013.01); G01J 3/0224 (2013.01);
Abstract
A transmissive diffraction grating includes a polarization conversion layer, a first diffractive layer disposed on one surface side of the polarization conversion layer, and a second diffractive layer disposed on the other surface side of the polarization conversion layer. Both the first diffractive layer and the second diffractive layer include refractive index modulation structures arranged with a period P in a first direction, and diffraction efficiency for a TE polarized light component is higher than a diffraction efficiency for a TM polarized light component.