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:
Mar. 03, 2009
Filed:
Oct. 25, 2005
Takuro Sugiura, Fukushima-ken, JP;
Koichi Yamamoto, Fukushima-ken, JP;
Hideaki Nagakubo, Fukushima-ken, JP;
Takuro Sugiura, Fukushima-ken, JP;
Koichi Yamamoto, Fukushima-ken, JP;
Hideaki Nagakubo, Fukushima-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A light guiding plate comprises a pair of main surfaces opposite to each other, and an end surface on which light emitted from a light source is incident. One of the pair of main surfaces has a plurality of prisms. Each of the prisms has a first surface which is relatively close to the end surface and has a relatively gentle slope, a second surface which is relatively distant from the end surface and has a relatively steep slope, and a third surface located between the first surface and the second surface, and an angle between the second surface and the third surface is an acute angle.