Patent ID: 8529114

Claim:
A transparent sheet having a first surface and a second surface, wherein the first surface is adjacent to a light emitting element in use, the second surface includes a plurality of minute regions δ comprising a plurality of minute regions δ 1 and a plurality of minute regions δ 2 , the plurality of minute regions δ 1 being randomly arranged and accounting for 40% or more and 98% or less of the plurality of minute regions δ, and the plurality of minute regions δ 2 being the other minute regions δ, among the plurality of minute regions δ, a diameter of a largest circle inscribed in the minute region δ being 0.2 μm or more and 8.0 μm or less, and one minute region δ being adjacent to and surrounded by a plurality of other minute regions δ, each minute region δ 1 projects to a position above the minute region δ 2 , each minute region δ 2 dents to a position below the minute region δ 1 , each minute region δ 1 having a height d above a bottom of each minute region δ 2 , and d is 0.2 μm or more and 1.4 μm or less.