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Title:
STAMPER FOR DUPLICATING DISK SUBSTRATE
Document Type and Number:
Japanese Patent JPH0342236
Kind Code:
A
Abstract:

PURPOSE: To obtain a stamper capable of duplicating a disk substrate of high quality by providing a piercing hole having a specific diameter for sending a gas for releasing in the vicinity of the center of the stamper.

CONSTITUTION: A piercing hole 7 for sending a gas for releasing at the time of release in a disk substrate duplicating process is formed to the center of a stamper 1. The proper size of the piecing hole 7 is 0.01 - 1mm, pref., 0.05 - 0.1mm. By this method, when a resin substrate + cured UV resin is released from the stamper in the disk substrate duplicating process, the release gas is sent in through said piercing hole and release is performed from the center to the outer peripheral part of the stamper and, therefore, the generation of the broken piece of a 2P resin at the outer peripheral and thereof is suppressed and, even if the broken piece is generated, since an air stream going to the outer peripheral part from the center is formed by air pressure, said broken piece becomes hard to bond to the disk substrate and the disk substrate of high quality can be duplicated.


Inventors:
ITO FUMIO
Application Number:
JP17735489A
Publication Date:
February 22, 1991
Filing Date:
July 10, 1989
Export Citation:
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Assignee:
RICOH KK
International Classes:
G11B7/26; B29D17/00; (IPC1-7): B29D17/00; G11B7/26
Attorney, Agent or Firm:
Toshiaki Ikeura (1 outside)



 
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