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:
May. 30, 2017
Filed:
Apr. 04, 2013
Kuraray Co., Ltd., Kurashiki-shi, JP;
Seiji Kinoshita, Tsukuba, JP;
KURARAY CO., LTD., Kurashiki-shi, JP;
Abstract
Provided is an edge-light type illumination device capable of increasing luminance directly thereunder and capable of providing anisotropy to the luminance distribution. Light to be emitted from an emission surface () of a light-guide plate () fulfills a condition (1) E/E>2.0 and a condition (2) E(20°,0°)/E(20°,90°)>1.2. Here, average intensity of light to be emitted from the emission surface () is Em and total light intensity of the light to be emitted in a Z-axis direction is Etotal, the total light intensity Etotal(20°, 0°) of the light to be emitted is ΣΔPi(20°,0°)/Δω when an angle θ of the light to be emitted relative to a Z-axis direction is 20° and an angle φ of the light to be emitted relative to an X-axis direction is 0°, and the total light intensity Etotal(20°, 90°) of the light to be emitted from the emission surface () is ΣΔPi(20°,90°)/Δω when the angle θ of the light to be emitted relative to the Z-axis direction is 20° and the angle φ of the light to be emitted relative to the X-axis direction is 90°.