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Title:
STAMPER FOR MANUFACTURING INFORMATION RECORDING MEDIUM
Document Type and Number:
Japanese Patent JPS59171004
Kind Code:
A
Abstract:

PURPOSE: To obtain a stamper which generates no distortion of sound grooves nor ghost by providing a thermoplastic resin layer on the rear side of the stamper on which a projecting bar corresponding to information recording grooves is formed, and forming the rear side as a smooth surface.

CONSTITUTION: A recessed groove 2 corresponding to a projecting bar 1 for forming sound grooves by a press is left on the rear side of a stamper main body A. Therefore, a resin layer B is formed as a smooth surface by heating a thermoplastic resin and spraying it to the rear side of the stamper. In this way, at the time of pressing, even if a force (a) for spreading out the projecting bar 1 is applied, the sound grooves generate no deformation nor distortion. Also, even if a force (b) for pushing laterally the projecting bar 1 is applied by a crushed force of a projecting bar 1', its influence is not exerted, and no ghost is generated. Therefore, a stamper which generates no distortion nor ghost is obtained.


Inventors:
OOGOSHI SEIJI
SUZUKI SHIYUUICHIROU
Application Number:
JP4437283A
Publication Date:
September 27, 1984
Filing Date:
March 18, 1983
Export Citation:
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Assignee:
TOSHIBA EMI KK
International Classes:
G11B3/70; B29C43/00; B29C43/32; B29C43/36; B29C61/00; B29D17/00; G11B3/68; (IPC1-7): B29D17/00; G11B3/70
Attorney, Agent or Firm:
Hideo Takino



 
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