Patent ID: 8409671

Claim:
A method for forming a resin film, comprising the steps of: providing an apparatus; spreading a liquid material on a substrate or between substrates by rotating the substrate(s) using the apparatus; during or after rotating, irradiating annular light from a central side to an outer circumferential side of the substrate(s) using the apparatus such that an inner diameter and an outer diameter of the annular light are increased concentrically in relation to a rotation center of the substrate(s) as irradiation time of the annular light progresses, so that an amount of light irradiation energy per unit area of surface to which the annular light is irradiated is uniform, such that the liquid material is cured; wherein the apparatus comprising: a substrate rotation mechanism for rotating the substrate(s), in which the liquid material for forming the resin film has been fed on the substrate or between the substrates; a light-irradiating mechanism for curing the spread liquid material by irradiating light thereto during or after spreading the liquid material by rotation, and for shifting the irradiation of light from a central side to an outer circumferential side of the substrate(s), the light-irradiating mechanism comprising: a light source for generating light to be irradiated to a light irradiated surface of the resin film; a control unit for controlling start and stop of irradiating the light; and a light-irradiating head that is provided with an annular-light-irradiating portion for changing the light from the light source into annular light; and wherein the light-irradiating head is provided with a lens member for orienting the annular light at a predetermined angle phi formed with respect to a central axis of the rotation center, so that an amount of light irradiation energy per unit area of a surface to which the annular light is irradiated is uniform.