Patent ID: 6849350

Claim:
An article having surface irregularities comprising a substrate and an organic-inorganic composite film formed on the surface of the substrate, wherein the organic-inorganic composite film contains a metal oxide represented by the following formula (3): M 3 O P (3) wherein M 3 is Si, Ti, Zr, Ge, Al, Sn or Sb, and p is 2 when M 3 is Si, Ti, Zr, Ge or Sn and 3/2 when M 3 is Al or Sb, and a metal compound represented by the following formula (4): R 2 M 4 O q (4) wherein R 2 is an aryl group, substituted aryl group or benzyl group, M 4 is Si, Ti, Zr, Ge, Al, Sn or Sb, and q is 3/2 when M 4 is Si, Ti, Zr, Ge or Sn and 2 when M 4 is Al or Sb; and wherein at least one of M 3 in the formula (3) and M 4 in the formula (4) is at least one specific metal atom selected from the group consisting of Ti, Zr, Ge, Al, Sn and Sb, and the specific metal atom accounts for at least 10 atom % of the total of M 3 and M 4 .