Patent ID: 7727615

Claim:
A pressure-sensitive adhesive sheet comprising a substrate having a surface roughness (Ra) of not less than 0.03 μm, a lightness (L*) in the L*a*b* color system of not more than 60 in the case of having a chroma (C*) of not more than 60 and a lightness (L*) of not more than 85 in the case of having a chroma (C*) greater than 60, and a contrast ratio of not less than 90%, and a pressure-sensitive adhesive layer, the pressure-sensitive adhesive sheet wherein: the pressure-sensitive adhesive sheet is formed with a plurality of through-holes passing through from one surface to the other surface thereof at a hole density of from 30 to 50,000 per 100 cm 2 through laser processing; said through-holes have a diameter in said substrate and said pressure-sensitive adhesive layer of from 0.1 to 150 μm; said through-holes have a diameter at a surface of said substrate of from 0.1 to 42 μm; melted portions formed by the laser around said through-holes at the surface of said substrate have an outside diameter of not more than 50 μm; and thermally deformed portions formed by the laser around said through-holes or around said melted portions at the surface of said substrate have an outside diameter of not more than 180 μm.