Patent ID: 8491160
Filing Date: 2013-07-23
Classification: G02B,H01L,Y10T

Abstract:
1. A transparent sheet usable in the state where one of surfaces thereof is adjacent to a light emitting body, wherein: the other surface of the sheet is divided into a plurality of tiny areas δ having such a size that a maximum circle among circles inscribed thereto has a diameter of 0.5 μm or greater and 3 μm or less, and one of the tiny areas δ is adjacent to, and surrounded by, others of the plurality of tiny areas δ; the plurality of tiny areas δ include a plurality of tiny areas δ the plurality of tiny areas δ the plurality of tiny areas δ the tiny areas δ the tiny areas δ the tiny areas δ the tiny areas δ the reference plane is located at an intermediate position, in a direction perpendicular to the other surface of the sheet, between the tiny areas δ d is 0.2 μm or greater and 3.0 μm or less.