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. 19, 2011
Filed:
Dec. 21, 2007
Junji Miyashita, Fujiyoshida, JP;
Takumi Miyashita, Fujikawaguchiko-machi, JP;
Junji Miyashita, Fujiyoshida, JP;
Takumi Miyashita, Fujikawaguchiko-machi, JP;
Citizen Electronics Co., Ltd., Fujiyoshida-shi, Yamanashi-ken, JP;
Abstract
A planar light-emitting device includes an elongate first lightguide plate () having a light entrance end surface () disposed facing an exit surface () of a light-emitting package (), a reflecting side surface () extending substantially at right angles to the light entrance end surface to reflect light entering through the light entrance end surface, and a light exit side surface () facing the reflecting side surface, and a flat plate-shaped second lightguide plate () having a light entrance side edge surface () facing the light exit side surface (). The first lightguide plate is configured to satisfy the condition of t<t≦twhere: t, tand tare the respective heights of the light exit side surface (), the reflecting side surface () and the light entrance end surface (). The surfaces of the first lightguide plate other than the light entrance end surface () and the light exit side surface () are reflecting surfaces.