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Title:
【発明の名称】メモリデイスク用基板の製造方法
Document Type and Number:
Japanese Patent JPH0638964
Kind Code:
B2
Abstract:
A method of manufacturing a substrate for a memory disk characterized in that a blank material comprising a non-magnetic metal substrate covered with a non-magnetic metal as an underlayer is subjected to a coining operation by two dies having flat compressing surfaces within an apparatus including a mandrel and a die ring arranged to limit the spreading extent of the material whereby a surface having ultra-preciseness is obtained.

Inventors:
Thomas You Co
Watanabe Kozo
Atsushi Yamazaki
Application Number:
JP29759685A
Publication Date:
May 25, 1994
Filing Date:
December 28, 1985
Export Citation:
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Assignee:
Furukawa Aluminum Industry Co., Ltd.
Kawasaki Steel Co., Ltd.
ITOCHU Corporation
International Classes:
B21D31/00; B21D1/06; B21D22/02; G11B5/84; G11B23/00; (IPC1-7): B21D1/06; B21D22/02; G11B5/84
Domestic Patent References:
JP57185964A
JP58141828A
JP6247822A
JP61502787A
Attorney, Agent or Firm:
Kyozo Yuasa (4 outside)