| 摘要 |
PROBLEM TO BE SOLVED: To almost uniformly cool down each part of a specular plate and to suppress warp of a molded disk board, by a method wherein cooling efficiency is increased by ensuring the total extended distance of flow passages and wherein the temperature of a cooling medium made to flow through the flow passages is prevented from rising to a prescribed value or above by keeping down the length of each flow passage to a prescribed value or below, in a mold used for injection molding of the disk board. SOLUTION: In the mold for molding the disk board, including the specular plate 5 which forms a cavity surface directly or with a stamper 20 interposed and has the cooling medium flow passage 9, the cooling medium flow passage 9 formed on the specular plate 5 is composed of a set of cooling medium flow passages 10 comprising a plurality of cooling medium flow passages 10b and 10c adjacent to each other through which the cooling medium is made to flow in the same direction, and the set of the passages 10 is formed spirally. COPYRIGHT: (C)2004,JPO |
