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US 8,274,865 B2Granted
Master disk for magnetic recording medium
AssigneeFuji Electric Co., Ltd.
InventorSatomi Kajiwara
Life of this patent
Estimating the term…
Abstract
A master disk for batch transferring of predetermined information recorded therein to a magnetic recording medium includes a substrate transmitting laser light, and convex portions provided on the substrate and formed of material reflecting or blocking the laser light. The convex portions have a pattern corresponding to the predetermined information.
Claims7
A master disk for batch transferring of predetermined information recorded therein to a magnetic recording medium, comprising:
- a substrate transmitting laser light;
- and
- convex portions provided on the substrate and formed of material blocking the laser light, said convex portions having a pattern corresponding to the predetermined information.
A master disk for batch transferring of predetermined information recorded therein to a magnetic recording medium, comprising:
- a substrate transmitting laser light;
- and
- convex portions provided on the substrate and formed of thin metal film blocking or reflecting the laser light, said convex portions having a pattern corresponding to the predetermined information so that when the laser light is irradiated on the master disk having the convex portions on the substrate, the laser light only passes through the substrate where the pattern of the convex portions is not formed.
Dependencies are inferred from the claim text.