Method and apparatus for imprinting energy ray-setting resin, and discs and semiconductor devices with imprinted resin layer
Disclosed herein is a method for transferring a pattern of minute dents and projections to an energy ray-setting resin layer coated on a substrate plate by pressing a master pattern on a transfer mold, followed by irradiation of energy rays. The pattern transfer method comprises the steps of pressing a master pattern on a transfer mold against the resin layer under a predetermined imprinting pressure, irradiating the resin layer under the imprinting pressure with energy rays, interrupting the irradiation of energy rays and at the same time cancelling application of the imprinting pressure and holding the resin layer and the transfer mold in a non-pressed state to relieve the resin layer of internal stresses, and recommencing irradiation of the resin layer with energy rays to complete hardening of the resin layer which is held in contact with the transfer mold in a non-pressed state.
1. A method for transferring a pattern of minute dents and projections to an energy ray-setting resin layer coated on a substrate plate by pressing a master pattern on a transfer mold, followed by irradiation with energy rays, characterized in that said method comprises the steps of:
pressing said transfer mold against said resin layer by application of a predetermined imprinting pressure in a pattern imprinting stage to imprint profiles of minute dents and projections of said master pattern on said resin layer;
hardening said resin layer in a first hardening stage, irradiating energy rays toward said resin layer which is still in pressed contact with said transfer mold under said imprinting pressure;
temporarily interrupting irradiation of energy rays of hardening of said resin layer halfway in an interrupting stress relieving stage, holding said transfer mold in a non-pressed state to relieve internal stresses of said resin layer; and
recommencing irradiation of energy rays to complete hardening of said resin layer in a second hardening stage, holding said transfer mold in contact with said resin layer in a non-pressed state.
2. A method as defined in claim 1 , wherein said energy ray-setting resin is an ultraviolet-setting resin.
3. A method as defined in claim 1 , wherein said energy ray-setting resin is an electron ray-setting resin.