Patent ID: 8475004
Filing Date: 2013-07-02
Classification: G02B,H01L,Y10T

Abstract:
1. A transparent sheet for use with a light emitting body with one of surfaces of the transparent sheet being adjacent to the light emitting body, wherein the other surface of the transparent sheet includes a plurality of minute regions δ, a largest inscribed circle of the minute regions δ having a diameter from 0.2 μm to 8.0 μm, one of the minute regions δ being adjoined by and surrounded by some other ones of the minute regions δ, the plurality of minute regions δ include a plurality of minute regions δ the minute regions δ the minute regions δ the predetermined reference plane is equidistant from the minute regions δ d is from 0.2 μm to 1.4 μm, the plurality of minute regions δ have a shape of a polygon in a plane of the other surface, the plurality of minute regions δ are arranged in the plane of the other surface along a first direction that is parallel to one side of the polygon, and ones of the plurality of minute regions δ adjoining each other along the first direction are at positions which are coincident with each other in terms of a second direction that is perpendicular to the first direction, and a pair of minute regions adjoining each other along the second direction are at positions which are shifted from each other in terms of the first direction.