Process for producing information recording discs
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United States of America Patent
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May 30, 1989
Grant Date -
N/A
app pub date -
Aug 11, 1988
filing date -
Aug 11, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for producing information recording discs of an air sandwich structure by ultrasonic welding together two disc substrates, at least one of which has a recording medium containing layer, through outer and inner peripheral spacers lying therebetween, which process is characterized in that the ultrasonic welding is carried out by the use of a horn and an anvil which are so designed that each of said horn and said anvil has a difference in height along the axial direction between its portion corresponding to the outer peripheral spacer and its portion corresponding to the inner peripheral spacer, wherein the sum of differences in height of said horn and said anvil corresponds to the difference in thickness between the outer peripheral poritons of said two disc substrates plus the outer peripheral spacer and the inner peripheral portions of said two disc substrates plus the inner peripheral spacer.
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