Patent ID: 6478570
Filing Date: 2002-11-12
Classification: B29C,B29L,Y10S

Abstract:
A disc-producing mold for forming a disc substrate having a circumferential direction by injection molding, comprising a cooling water ditch which is formed by a plurality of arcs of which radiuses are different from each other and connected to each other along the arc,wherein the cooling water ditch has a constant width portion having an approximately constant width and connecting a cooling water inlet and a cooling water outlet of the ditch, a first tapered part connected to the inlet and located on an opposite side of the inlet with respect to the constant width part, and a second tapered part connected to the outlet and located on an opposite side of the outlet with respect to the constant width part, said first tapered part gradually converging along a substantial portion of a length thereof and said second tapered part gradually converging along a substantial portion of a length thereof.