Patent ID: 9507072
Filing Date: 2016-11-29
CPC Classification: G02B

Claim Text:
1. A light guide formed in a plate shape, comprising: light emitting surfaces set on two opposing main surfaces; and a light incidence surface set on at least one side-edge surface, wherein a light emitting mechanism is formed in at least one region of at least two main surfaces, the haze value is 3% or lower in the region where the light emitting mechanism is formed; when a perfect diffuse light enters through the at least one light incidence surface, a maximum emission angle from a region of one main surface with the light emission mechanism is in a range from −30 degrees to +30 degrees with respect to a normal line to the main surface, while the maximum emission angle from a region of the other main surface with the light emission mechanism is in a range from −60 degrees to −30 degrees; in a range from +30 degrees to +60 degrees; or in both of a range from −60 degrees to −30 degrees and another range from +30 degrees to +60 degrees; and the utilization efficiency of emitted light is 15% or greater.