Patent ID: 7048988

Claim:
A support for a lithographic printing plate, wherein surface area ratios obtained from three-dimensional data which can be found by measuring 512×512 points in 50 μm square on the surface with an atomic force microscope meets the following requirements (1-i) to (1-iii): (1-i) A surface area ratio ΔS 50(50) is 20 to 90%, (1-ii) A surface area ratio ΔS 50(2-50) is 1 to 30%, and (1-iii) A surface area ratio ΔS 50(0.2-2) is 5 to 40%, where, ΔS 50(50) is the surface area ratio which can be obtained by the following equation from an actual area S x 50 obtained by a three-point estimate from the three-dimensional data and a geometrically measured area S o 50 , ΔS 50(50) =[( S x 50 −S o 50 )/ S o 50 ]×100(%) (1-1) ΔS 50(2-50) is the surface area ratio obtained after extracting components with wavelength of 2 μm or more and 50 μm or less from the three-dimensional data, and ΔS 50(0.2-2) represents the surface area ratio obtained after extracting components with wavelength of 0.2 μm or more and 2 μm or less from the three-dimensional data.