Optical disk stamper

Details Optical disk stamper Optical disk stamper

2005-01-25

2005-01-25

Mackey, James P. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Shaping or casting surface

C425S810000

Reexamination Certificate

active

06846174

ABSTRACT:
Optical-disk stamper that prevents mold-release defects caused by mold-release irregularities that occur when the mold is opened while improving transferability during disk molding to enable the manufacture of high-quality optical disks at a favorable yield rate. On one side of a stamper body (1), a molding surface (2) furnished when bumps (3) for imprinting pits into an optical disk is formed. The molding surface, including the bumps, is formed of a polymer resin whose thermal diffusivity is 0.01 m2/h or under. More preferably the molding surface is formed of a poorly heat-conducting phenolic resin whose thermal diffusivity is between 0.0004 and 0.001 m2/h, suppressing heat diffusion from the molten resin toward the stamper during the disk molding process and nullifying rapid cooling and local hardening of the resin.

REFERENCES:
patent: 4723903 (1988-02-01), Okazaki et al.
patent: 6354827 (2002-03-01), Kerfeld
patent: 6706465 (2004-03-01), Sano

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