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:
Aug. 04, 2015
Filed:
Mar. 15, 2011
Kenji Yagi, Yokohama, JP;
Minoru Shimizu, Yokohama, JP;
Yasuo Wakui, Yokohama, JP;
Yoshiya Kurachi, Yokohama, JP;
Masatoshi Toda, Tokyo, JP;
Kenji Yagi, Yokohama, JP;
Minoru Shimizu, Yokohama, JP;
Yasuo Wakui, Yokohama, JP;
Yoshiya Kurachi, Yokohama, JP;
Masatoshi Toda, Tokyo, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Abstract
Disclosed is a plate-like light guide element () provided with a light incident surface, a light exit surface (), and an underside surface () disposed on the opposite side of the light exit surface (). A foamed surface layer () is formed on at least a part of at least either the light exit surface () or the underside surface (). The foamed surface layer () contains air bubbles and has a recessed sectional surface including the normal direction of the light exit surface () or the underside surface (). The light guide element () is produced by performing infrared laser etching for at least a part of at least one of the main surfaces of a plate-like light guide element material composed of an acryl resin plate produced by a continuous plate production method, to form the foamed surface layer ().