Patent ID: 7722921

Claim:
An anti-reflection film producing method of producing anti-reflection film including a transparent support, at least one optical functional layer overlaid on said support, and a low refractive index layer, overlaid on said optical functional layer, and having a lower refractive index than said optical functional layer, said anti-reflection film producing method comprising: a coating step of coating a surface of said optical functional layer with liquid for forming said low refractive index layer, to form a coating layer; a drying step of promoting drying of said coating layer; a hardening step of thermally hardening said coating layer after promoting of drying, to form said low refractive index layer; said hardening step including: a first heating step of heating said coating layer at a first temperature level for hardening; a second heating step of heating said coating layer at a second temperature level for hardening higher than said first temperature; and wherein said first temperature level is equal to or higher than 70 deg. C. and equal to or lower than 110 deg. C.; and wherein said second temperature level is equal to or higher than 100 deg. C. and equal to or lower than 160 deg. C.