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US 5,686,225 AGranted
Method of manufacturing a multilayer information disc
AssigneeSamsung Electronics Co., Ltd.
InventorKwang-hyuk Chang
Life of this patent
Estimating the term…
Abstract
A multilayer information disc formed by joining a plurality of disc units and a manufacturing method thereof are provided. The plurality of disc units contain information tracks which have the same spiral directions relative to an optical pickup device when the plurality of the disc units are joined. As a result, information recorded on all of the disc units can be reproduced by rotating the multilayer information disc in a single direction. Consequently, the structure and cost of the recording/reproducing apparatus which reproduces the information is reduced.
Claims5
A manufacturing method of a multilayer information disc, comprising the steps of:
- manufacturing an original disc having an original recording surface, wherein said original recording surface comprises an original information track having one of a plurality of pits and a plurality of protrusions and having an original spiral direction;
- manufacturing a metal mask based on said original disc,
- wherein said metal mask comprises a metal mask recording surface having a metal mask information track, and
- wherein said metal mask recording surface is complementary to said original recording surface such that a metal mask spiral direction of said metal mask information track is opposite to said original spiral direction when said original disc and said metal mask are separate;
- manufacturing a first disc unit based on said metal mask,
- wherein said first disc unit comprises a first recording surface having a first information track, and
- wherein said first recording surface is substantially identical to said original recording surface such that a first spiral direction of said first information track is the same as said original spiral direction;
- manufacturing a second disc unit,
- wherein said second disc unit comprises a second recording surface having a second information track, and
- wherein said second information track has a second spiral direction which is the opposite to said first spiral direction when said first and second disc units are separate;
- and
- forming a multilayered structure by joining said first and second disc units such that said first and second recording surfaces face each other and such that said first and second spiral directions are the same when said first and second disc units are joined,
- wherein said second disc unit is manufactured based on said original disc, and
- wherein said second recording surface is substantially identical to said metal mask recording surface such that said second spiral direction is the same as said metal mask spiral direction.
11 more elements
A manufacturing method of a multilayer information disc, comprising the steps of:
- manufacturing an original disc having an original recording surface, wherein said original recording surface comprises an original information track having one of a plurality of pits and a plurality of protrusions and having an original spiral direction;
- manufacturing a metal mask based on said original disc,
- wherein said metal mask comprises a metal mask recording surface having a metal mask information track, and
- wherein said metal mask recording surface is complementary to said original recording surface such that a metal mask spiral direction of said metal mask information track is opposite to said original spiral direction when said original disc and said metal mask are separate;
- manufacturing a first disc unit based on said metal mask,
- wherein said first disc unit comprises a first recording surface having a first information track, and
- wherein said first recording surface is substantially identical to said original recording surface such that a first spiral direction of said first information track is the same as said original spiral direction;
- manufacturing a second disc unit,
- wherein said second disc unit comprises a second recording surface having a second information track, and
- wherein said second information track has a second spiral direction which is the opposite to said first spiral direction when said first and second disc units are separate;
- and
- forming a multilayered structure by joining said first and second disc units such that said first and second recording surfaces face each other and such that said first and second spiral directions are the same when said first and second disc units are joined;
- manufacturing an intermediary stamp directly from said metal mask,
- wherein said intermediary stamp comprises an intermediary recording surface having an intermediary information track, and
- wherein said intermediary recording surface is substantially identical to said original recording surface such that an intermediary spiral direction of said intermediary information track is the same as said original spiral direction;
- manufacturing a molding stamp directly from said intermediary stamp,
- wherein said molding stamp comprises a molding recording surface having a molding information track, and
- wherein said molding recording surface is substantially identical to said metal mask recording surface such that a molding spiral direction of said molding information track is the same as said metal mask spiral direction;
- and
- manufacturing said first disc unit based on said molding stamp such that said first spiral direction is the same as said original spiral direction,
- wherein said second disc unit is manufactured based on said intermediary stamp such that said second spiral direction is the same as said metal mask spiral direction.
18 more elements
Dependencies are inferred from the claim text.