Patent ID: 8405796
Filing Date: 2013-03-26
Classification: G02F

Abstract:
1. An illumination device, comprising: a plurality of groups each including (i) a light source and (ii) a light guide arranged to obtain plane light emission by diffusing light from the light source, the light guides overlapping each other such that the light guides lean on their neighboring one so as to make an angle to an irradiated surface, each of the light guides including (i) a reflection surface, which is on a side opposite to the irradiated surface and (ii) a light emitting surface, which is opposite to the reflection surface and is not covered by a neighboring one of the light guides, the light emitting surface being defined by (a) a first emitting surface, which is substantially parallel with the reflection surface and (b) a second emitting surface, which is substantially parallel with the irradiated surface, the first emitting surface and a first portion of the reflection surface defining a first emitting surface region of said each of the light guides, and each of the light guides being provided with, at least in the first emitting surface region, at least one diffusing element arranged to diffuse the light before the light exits the light guide.