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Title:
STAMPER FOR OPTICAL DISK
Document Type and Number:
Japanese Patent JP3690740
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide a stamper for an optical disk which eliminates release failure due to release irregularity during opening the mold while the transferring property is improved for molding a disk and with which high-quality optical disks can be manufactured with high yield.
SOLUTION: A molding face 2 having bumps 3 to transfer and form pits in an optical disk is formed on one face of a stamper body 1. The molding face 2 including the bumps 3 is made of a polymer resin having ≤0.01 m2/h coefficient of thermal diffusion. More preferably, the molding face 2 is made of a phenol resin having 0.0004 to 0.001 m2/h coefficient of thermal diffusion or lower which is less thermally conductive so that the diffusion of heat from a fused resin to the stamper during molding a blank disk is suppressed and local solidification of the fused resin due to rapid cooling is avoided.


Inventors:
Toshio Kawai
Application Number:
JP2001350412A
Publication Date:
August 31, 2005
Filing Date:
November 15, 2001
Export Citation:
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Assignee:
Toshio Kawai
International Classes:
G11B7/26; B29C45/26; B29D17/00; (IPC1-7): G11B7/26
Domestic Patent References:
JP2000135718A
JP5059615U
JP62012939A
JP58010763B1
JP2015170A
Attorney, Agent or Firm:
Samurai