Product and process for manufacturing an optical disc master
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United States of America
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Jan 11, 1994
Grant Date -
N/A
app pub date -
Oct 22, 1992
filing date -
Feb 20, 1990
priority date (Note) -
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Abstract
The invention discloses a simplified four step process for making an optical disc master or alternatively a WORM disc by first making or obtaining a transparent polymer disc with a tracking groove of desired geometry molded therein, then spin coating an optically active lamina on the grooved side of the disc, then recording data on said polymer disc with groove controlled and tracked laser means by ablating active lamina, forming pits, the shape of which is determined by the groove geometry and finally depositing a conductive and reflective lamina over the pitted active lamina. To change the OD master to an OD WORM, a protective cover is added to the electrically conductive and optically reflective lamina.
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