Patent ID: 7736558

Claim:
A nano-imprint method comprising the steps of: softening a thin resin film that is made of poly (methyl methacrylate) and has a thickness of 50 μm or smaller, in an object to be processed, by infiltrating supercritical CO 2 into the thin resin film with a pressure between 10 and 30 MPa, the object including a substrate and the thin resin film applied onto the substrate; transferring a nano-order pattern onto the thin resin film that has been softened, by pressing a mold that has the pattern against the thin resin film in the object, and a temperature of the object being made lower than a glass transition temperature of the thin resin film in said transferring step; decompressing the supercritical CO 2 when the thin resin film is being soft after said transferring step, and hardening the thin resin film; and maintaining a temperature of the mold at a constant temperature equal to or lower than the glass transition temperature of the thin resin film in each of said softening, transferring and decompressing steps.