Low cost substrate for bump-forming recording media
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United States of America Patent
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Apr 11, 1995
Grant Date -
N/A
app pub date -
Jul 25, 1991
filing date -
Jul 25, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Write-once and erasable recording media (1) and a method of manufacturing such media. According to one aspect of the invention, one or more active layers (26, 30) of the optical data storage medium is formed by spin-on techniques. According to this aspect of the invention, the material used in forming the active layer is formed before the formation of the center aperture (4) in the optical disc. This aspect of the invention provides a substantially smaller 'wedge' than prior methods. According to one preferred aspect of the invention, tracking grooves (24) in a flexible sheet (22) are bonded to a substantially rigid substrate (18). The sheet is bound to the substrate such that the tracking marks are directed away from the substrate. The active layers of an optical recording media are then formed on the sheet by, for example, spin-on techniques.
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