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:
Oct. 05, 2007
Hideaki Hirai, Kanagawa, JP;
Yoshiyuki Kiyosawa, Miyagi, JP;
Kazuhiro Umeki, Iwate, JP;
Yasuhiro Fujimura, Iwate, JP;
Hideaki Hirai, Kanagawa, JP;
Yoshiyuki Kiyosawa, Miyagi, JP;
Kazuhiro Umeki, Iwate, JP;
Yasuhiro Fujimura, Iwate, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A disclosed optical element includes: a transparent substrate; a subwavelength structure layer disposed on the transparent substrate, the subwavelength structure layer having a refractive index different from a refractive index of the transparent substrate; a minute concave and convex structure of one-dimensional grating formed on the subwavelength structure layer with a subwavelength period smaller than a wavelength to be used, where a concave portion reaches a boundary surface between the transparent substrate and the subwavelength structure layer; and an open hole portion formed on a subwavelength structure layer side of the transparent substrate so as to communicate with the concave portion of the minute structure and to be arranged with the same period as in the minute structure of one-dimensional grating. At least at the open hole portion, a refractive index relative to an incident light is changed in a direction orthogonal to the boundary surface.