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:
Sep. 20, 2005
Filed:
Feb. 09, 2004
Hideyuki Nakanishi, Ohtsu, JP;
Shoichi Takasuka, Osaka, JP;
Shinichi Ijima, Takatsuki, JP;
Akio Yoshikawa, Kyotanabe, JP;
Teruhiro Shiono, Osaka, JP;
Hideyuki Nakanishi, Ohtsu, JP;
Shoichi Takasuka, Osaka, JP;
Shinichi Ijima, Takatsuki, JP;
Akio Yoshikawa, Kyotanabe, JP;
Teruhiro Shiono, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A first diffractive optical element pattern with a pattern pitch that is no greater than a wavelength of incident light is formed on a first main surface of substrate such as a glass plate. Second diffractive optical element patterns are formed at positions that are respectively incident to positive first-order diffracted light and negative first-order diffracted light produced by the first diffractive optical element pattern. Negative first-order diffracted light produced by each second diffractive optical element pattern is incident upon a boundary face of the substrate at an angle that is smaller than the critical angle, and so exits the substrate.