Mold for molding optical disc

Details Mold for molding optical disc Mold for molding optical disc

1987-02-04

1988-11-08

Woo, Jay H.

Static molds

Providing substitution of alternatively used parts

Part having intelligence

249111, 249112, 249114, 249134, 264338, 425190, 425810, B29C 3338

Patent

active

047830417

ABSTRACT:
A mold for molding an optical disc includes a first mold member having a recess, and a second mold having a body and a plate-like sintered ceramic member secured to the body and having a flat seat surface. The recess and the flat seat surface jointly provides a mold cavity when the first and second mold members are mated together. A disc-shaped thin stamper is adapted to be seated on and detachably secured to the flat seat surface. The ceramic member is made of a ceramic material having Rockwell hardness (A-Scale) of not less than 90, so that the flat seat surface is not subjected to undue damage for a prolonged period of time.

REFERENCES:
patent: 3734449 (1973-05-01), Itou et al.
patent: 4120930 (1978-10-01), Lemelson
patent: 4225109 (1980-09-01), Yotsutsuji et al.
patent: 4614630 (1986-09-01), Pluim, Jr.

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