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:
Apr. 17, 2007
Filed:
Feb. 26, 2003
Mitsuru Kano, Fukushima-ken, JP;
Mitsuru Kano, Fukushima-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A backlight is disposed on a rear surface side of a subject to be irradiated and illuminates the subject to be irradiated from the rear surface side. The backlight includes: a light guide plate; an intermediate light guide disposed along an end surface on one side of the light guide plate; and a light source disposed to an end portion of the intermediate light guide. One surface side of the light guide plate is formed into a reflection surface on which a concavoconvex shape is formed so as to reflect light propagating inside thereof. The other surface side of the light guide plate is formed into an exit surface that outputs the light reflected by the reflection surface. The reflection surface includes a plurality of grooves that are formed of a gentle slope portion and a steep slope portion. The subject to be irradiated is disposed outside of the exit surface.