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. 11, 2010
Filed:
Mar. 09, 2007
Satoshi Kawakita, Tokyo, JP;
Motoo Aiba, Tokyo, JP;
Kyu Kanno, Miyagi, JP;
Jin Sato, Miyagi, JP;
Takatoshi Yamada, Kanagawa, JP;
Satoshi Kawakita, Tokyo, JP;
Motoo Aiba, Tokyo, JP;
Kyu Kanno, Miyagi, JP;
Jin Sato, Miyagi, JP;
Takatoshi Yamada, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A diffraction element for diffracting a particular wavelength of incident optical beam includes: a base section made from a first resin and provided with a predetermined diffraction pattern; and a cover section made from a second resin and covering the diffraction pattern, wherein a rate of change of refraction index of the first resin is substantially the same as a rate of change of refraction index of the second resin in a temperature range between a first temperature and a second temperature.