Patent ID: 7833378

Claim:
A method of manufacturing an optical disc, comprising: (i) controlling a temperature of first and second molds disposed side-by-side constituted by fixed molds mounted on a fixed platen and movable molds wherein the moveable molds move and fit the respective fixed molds to form cavities therebetween, by passing a temperature-controlling medium through temperature controlling flow passages provided in both the fixed and movable platens in the vicinity of a boundary between the first and second molds, and by passing a temperature-controlling medium through supplementary temperature controlling flow passages independent from the temperature controlling flow passages, which are formed substantially or nearly perpendicular to the temperature controlling flow passages as viewed in the axial direction of the molds in at least one of the fixed platen or the movable platen, wherein the supplementary temperature controlling flow passages are provided on either side of the cavities so as to sandwich the cavities as viewed in the axial direction of the molds; (ii) molding a first disc substrate by the first mold simultaneously with a second disc substrate by the second mold while controlling the temperature of the first and second molds by step (i); (iii) upon releasing the molded first and second disc substrates, applying an adhesive onto the molded first disc substrate, and (iv) attaching the second disc substrate to the first disc substrate by means of the adhesive.