Pre-engraved substrate for magnetic, magneto-optical, or phase transition optical disc
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United States of America Patent
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Sep 16, 2003
Grant Date -
N/A
app pub date -
May 16, 2001
filing date -
Aug 5, 1998
priority date (Note) -
Expired
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Abstract
The invention concerns a pre-engraved substrate for a memory disc recordable by magnetic, magneto-optical or phase transition constraint, its manufacturing method and the resulting disc. Said pre-engraved substrate comprises a support (1) having at its surface a surface film (2) in a reflecting material and enabling to obtain a surface with optical polish and at least a recordable film (4), the surface film (2) and the film (4) comprising a succession of microgrooves and/or pits (7) representing a pre-formatting signal, the walls (8) of said pits and/or microgrooves (7) being formed in such of films (2) and (4) of the material constituting said film. The invention is useful for making magnetic, magneto-optical and phase transition optical discs, used particularly in the field of computers.
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