Patent ID: 7323124
Filing Date: 2008-01-29
Classification: B29C,B29D,Y10S

Abstract:
1. An optical disc cover layer formation method comprising the steps of: supplying liquid-form photo-curing-type resin to a plate surface of a disc substrate; setting a dummy substrate over the plate surface of the disc substrate, the dummy substrate being formed of light-transmissive material and including a facing surface which opposes the plate surface with a predetermined spacing; coating the photo-curing-type resin on the plate surface, by rotating the disc substrate with the dummy substrate about an axial line perpendicular to the plate surface to spread the photo-curing-type resin between the plate surface and the facing surface; forming the cover layer, by irradiating light of a predetermined wavelength at the photo-curing-type resin through the dummy substrate for curing the photo-curing-type resin; and detaching the dummy substrate from the disc substrate, wherein the dummy substrate comprises a first spacing setting portion which, when the dummy substrate is set over the plate surface and the photo-curing-type resin is spread and coated on the plate surface, contacts the plate surface at the axial line side relative to a coat-region of the photo-curing-type resin on the plate surface and disposes the facing surface at a position opposing the plate surface with the predetermined spacing, and wherein the first spacing setting portion is an extending portion, which is provided at a central portion of the dummy substrate, extending toward the plate surface in a state in which the dummy substrate is set over the plate surface.