Microscopic roughness structure with protective film and method thereof

A protective film-attached microscopic roughness structure comprising:

• a microscopic roughness structure on the surface having a microscopically rough structure having a period less than or equal to the wavelength of visible light, and
• a protective film for protecting the surface of the microscopic roughness structure affixed thereto,
• wherein the protective film comprises an adhesive layer that is in contact with the surface on the microscopically rough structure side;
• in the infrared absorption spectrum of the surface of the microscopically rough structure, the ratio (A1/A2) of the peak area A1 having the absorption maximum in the region of 3700 cm−1 to 3100 cm−1, and the peak area A2 having the absorption maximum in the region of 1730±10 cm−1, is 0.1 to 0.8;
• and in the infrared absorption spectrum of the surface of the adhesive layer, the ratio (B1/B2) of the peak area B1 having the absorption maximum in the region of 3700 cm−1 to 3100 cm−1, and the peak area B2 having the absorption maximum in the region of 1730±10 cm−1, is 0.6 to 1.3,
• wherein the adhesive layer of the protective film is affixed to the entire surface of the microscopic roughness structure extending beyond the surface of the microscopic roughness structure.