Manufacturing method of substrate means for optical recording disk and apparatus therefor
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United States of America Patent
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-
Mar 8, 1994
Grant Date -
N/A
app pub date -
Jan 21, 1992
filing date -
Jun 20, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is provided a substrate for an optical recording disk capable of preventing non-uniformity of thickness of the transfer layer due to a camber of the substrate, and having a transfer layer excellent in uniformity of the thickness thereof. The substrate for the optical recording disk is manufactured in such a manner that a portion ranging from a center portion to an outer circumferencial portion of the substrate is forcively deformed in advance prior to the formation of the transfer layer so as to provide substantially a conical-convex shape, and thereafter, the transfer layer is formed onto a surface side of the conical-convex shape of the substrate.
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