EP0271300A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Replication of carriers bearing digitally recorded information
Assignee: EMI Group Ltd
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Filing: 1987-12-04
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Granted: —
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Expires: 2007-12-04
Abstract
Abstract The holographic manufacture of Compact Discs has three stages namely mastering, production of the sub-master holograms and replication. In the production stage, a holographic plate 1, spacer 3 and master transparency 4 are positioned against a prism 2, and then illuminated with split beams from a laser 7 in order to record a hologram, at plate 1, of the master transparency 4. The resultant hologram of plate 1 is then mass replicated on polycarbonate or photochromic discs to produce Compact Discs compatible to Component Disc conventional Compact Disc players.
Inventors
- 👤 Anthony Lang
- 👤 Paul Bloch
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 11:01
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/20; G11; G11B; G11B7/00; G11B7/004; G11B7/0065; G11B7/28; G03H1/0402; G03H1/0408; G03H2223/00; G03H2223/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
Equipment for the replication of carriers bearing digitally recorded information comprising means to locate a transparency of a carrier at a replication station, the carrier bearing digitally recorded information, means to position a photosensitive plate at the replication station, means to illuminate the carrier and the plate at the replication station to effect holographic patterning on the carrier, means to produce one or more replication carriers each having representations of the digitally recorded information derived from the holographic patterning on said photosensitive carrier.
Claim 2
Dependent Claim
83 words
Equipment for the replication of carriers bearing digitally recorded information comprising means to locate a transparency of a carrier at a replication station, the carrier bearing digitally recorded information, means to position a photosensitive plate at the replication station, means to illuminate the carrier and the plate at the replication station to effect holographic patterning on the carrier, means to produce one or more replication carriers each having representations of the digitally recorded information derived from the holographic patterning on said photosensitive carrier.
Claim 3
Dependent Claim
10 words
Equipment according to Claim 1, wherein the carriers comprise discs.
Claim 4
Independent Claim
84 words
A method for the replication of carriers bearing digitally recorded information comprising means to locate a transparency of a carrier at a replication station, the carrier bearing digitally recorded information, means to position a photosensitive plate at the replication station, means to illuminate the carrier and the plate at the replication station to effect holographic patterning on the carrier, means to produce one or more replication carriers each having representations of the digitally recorded information derived from the holographic patterning on said photosensitive carrier.
Claim 5
Independent Claim
84 words
A method for the replication of carriers bearing digitally recorded information comprising means to locate a transparency of a carrier at a replication station, the carrier bearing digitally recorded information, means to position a photosensitive plate at the replication station, means to illuminate the carrier and the plate at the replication station to effect holographic patterning on the carrier, means to produce one or more replication carriers each having representations of the digitally recorded information derived from the holographic patterning on said photosensitive carrier.
Claim 6
Dependent Claim
11 words
A method according to Claim 3, wherein the carriers comprise discs.
References Cited (Backward Citations)
No citation records indexed.
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