Method and apparatus for the fabrication of optical record media such as a digital audio disc
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United States of America Patent
Stats
-
Jan 7, 1992
Grant Date -
N/A
app pub date -
Sep 28, 1989
filing date -
Sep 30, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A novel optodynamic method and apparatus for the manufacture of an optical record medium of the type having a multiplicity of pits or like optically detectable marks representative of digitized information to be reproduced wherein a stamper is provided which is of quartz glass or like material that transmits ultraviolet radiation and which has a stamping surface shaped as a negative of the optically detectable marks to be created, the stamping surface is pressed against a blank sheet of polycarbonate or like plastic that absorbs ultraviolet radiation the surfaces of blank sheet is irradiated with ultraviolet light through the stamper whereby the surface of the blank sheet gels, or softens, to permit the optically detectable marks to be impressed thereon. The stamping may be dome in a partial vacuum in order to assure closer contact between the stamper and the blank sheet.
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