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. 21, 2012
Filed:
Nov. 30, 2007
Applicant:
Taisuke Isano, Utsunomiya, JP;
Inventor:
Taisuke Isano, Utsunomiya, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/30 (2006.01);
U.S. Cl.
CPC ...
Abstract
A waveplate including a dielectric substrate and a periodic structure formed on the dielectric substrate, said periodic structure having a period which is equal to or smaller than a wavelength of an incident light, wherein the periodic structure is constructed of a deposited film, and a refractive index of the deposited film gradually changes in a thicknesswise direction of the deposited film.