System for stamping an optical storage disk
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United States of America Patent
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-
Jun 27, 1995
Issued Date -
N/A
app pub date -
Jan 11, 1994
filing date -
Jun 9, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical storage disk consists of a glass substrate (1) into which guide tracks (3) for servo-controlling the focussed light beams are directly stamped by a hot stamp process. After stamping, the glass substrate is thermally quenched in the stamping device to increase its breaking resistance through thermal curing. In order to achieve uniform guide tracks over the entire surface of an optical storage disk, flexible stamp stencils (35) in a flexible holder (34) are used whose curvature can be changed by applying hydro-static pressure. Suitable stamp stencils consist of monocristalline silicon disks with surface hardening, or of metal disks, structured in photolithographic processes. The stamp lands are made with bevelled edges to facilitate the separating of stamp and glass substrate after cooling.
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