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Method for fabrication of disc substrate

  • US 5,552,098 A
  • Filed: 03/03/1994
  • Issued: 09/03/1996
  • Est. Priority Date: 10/12/1991
  • Status: Expired due to Term
First Claim
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1. A method for forming in a mold cavity created by a first metal mold and a second metal mold a disc substrate having a bottomed centering hole and a reference loading plane for disc rotating and driving means, the reference loading plane being substantially parallel to a planar region on which a light beam is incident, the reference loading plane being projected from the planar region, comprising the steps of:

  • holding a radially outer edge of a stamper in the mold cavity against an outer edge of the first metal mold with a holder attached to the first metal mold;

    holding a radially inner side of the stamper to the first metal mold;

    injecting synthetic resin into the mold cavity for forming the bottomed centering hole, wherein the bottomed centering hole is formed by a stationary member protruding into the mold cavity; and

    punching at least a part of the bottomed centering hole by a movable member protruded into the mold cavity for forming a through-hole.

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