EP0175408A1
Expired / Lapsed
EP
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Method of manufacturing an optically readable information disk
Assignee: Koninklijke Philips NV
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Filing: 1985-08-30
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Granted: —
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Expires: 2005-08-30
Abstract
Abstract An optically readable information disk having an optically readable information track of information areas situated alternately at a higher level and at a lower level and comprising a substrate which has a metal layer on at least one side, the information track being present only in the metal layer, the surface of the substrate adjoining the metal layer having a flat structure.
Inventors
- 👤 Hendricus Franciscus Joannes Jacobus Van Tongeren
- 👤 Petrus Egidius Jacobus Legierse
- 👤 Wilhelmus Barend Van Maurik
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 15:32
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; G11B7/242; G11B7/243; G11B7/258; G11B7/26; G11B7/253; G11B7/2533
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
An optically readable information disk having an optically readable information track of information areas situated alternately at a higher level and at a lower level and comprising a substrate which has a metal layer on at least main surface, characterized in that the information track is present only in the metal layer, the surface of the substrate adjoining the metal layer having a flat structure.
Claim 2
Dependent Claim
65 words
An optically readable information disk having an optically readable information track of information areas situated alternately at a higher level and at a lower level and comprising a substrate which has a metal layer on at least main surface, characterized in that the information track is present only in the metal layer, the surface of the substrate adjoining the metal layer having a flat structure.
Claim 3
Dependent Claim
30 words
An optically readable information disk as claimed in Claim 1, characterized in that a synthetic resin substrate is used which has a soft-metal layer on at least one main surface.
Claim 4
Dependent Claim
40 words
An optically readable information disk as claimed in Claim 2, characterized in that the synthetic resin substrate on at least one main surface has an electrolessly deposited metal layer which is covered with an electroplated layer of a soft metal.
Claim 5
Dependent Claim
50 words
An optically readable information disk as claimed in Claim 3, characterized in that the synthetic resin substrate is a synthetic resin foil which on at least one main surface has an electrolessly deposited layer of Ag, Ni or Cu covered with an electroplated layer of In or a Pb/Sn alloy.
Claim 6
Dependent Claim
36 words
An optically readable information disk as claimed in any one of the preceding Claims, characterized in that the metal layer is covered with a protective lacquer which in turn is covered with a synthetic resin foil.
Claim 7
Independent Claim
154 words
A method of manufacturing optically readable information disks, characterized in that a strip-shaped substrate which has a metal layer on one or both main surfaces is guided into a press or between a pair of rollers, a die of the press or the surface of one of the rollers bearing a pattern in the form of a negative of the desired information track, the information track is formed only in the metal layer of the substrate by compression or by rolling, at least the exposed surface of the part of the metal layer comprising the information track is provided with a trans- parant protective layer of a synthetic resin, and the information disk is separated from the remainder of the substrate strip by cutting outside the circumference of the information track present in the metal layer, and optionally a hole is punched in the centre of the substrate portion provided with the information track.
Claim 8
Independent Claim
154 words
A method of manufacturing optically readable information disks, characterized in that a strip-shaped substrate which has a metal layer on one or both main surfaces is guided into a press or between a pair of rollers, a die of the press or the surface of one of the rollers bearing a pattern in the form of a negative of the desired information track, the information track is formed only in the metal layer of the substrate by compression or by rolling, at least the exposed surface of the part of the metal layer comprising the information track is provided with a trans- parant protective layer of a synthetic resin, and the information disk is separated from the remainder of the substrate strip by cutting outside the circumference of the information track present in the metal layer, and optionally a hole is punched in the centre of the substrate portion provided with the information track.
Claim 9
Dependent Claim
29 words
A method as claimed in Claim 6, characterized in that reference holes with which the substrate can be exactly positioned are provided adjacent to the edges of the substrate.
References Cited (Backward Citations)
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