Patent ID: 8783179

Claim:
A lithographic printing plate support comprising: an aluminum plate; and an aluminum anodized film formed on the aluminum plate and having micropores which extend in a depth direction of the anodized film from a surface of the anodized film opposite from the aluminum plate, wherein each of the micropores has a large-diameter portion which extends to a depth of 5 to 60 nm (depth A) from the surface of the anodized film and a small-diameter portion which communicates with a bottom of the large-diameter portion and extends to a depth of 900 to 2,000 nm from a communication position, wherein an average diameter of the large-diameter portion at the surface of the anodized film is from 10 to 60 nm and a ratio of the depth A to the average diameter of the large-diameter portion (depth A/average diameter) is from 0.1 to 4.0, wherein a communication position average diameter of the small-diameter portion is more than 0 but less than 20 nm, and wherein a ratio of the average diameter of the small-diameter portion to the average diameter of the large-diameter portion (small-diameter portion diameter/large-diameter portion diameter) is up to 0.85.