EP0095821A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Medium for recording optically readable information
Assignee: Docdata NV
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Filing: 1983-06-02
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Granted: —
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Expires: 2003-06-02
Abstract
Abstract The Medium comprises a transparent substrate layer (15), a semi reflective recording layer (11) of a material which can melt, atomize or evaporate under the influence of light, and a separating layer (12). Into the separating layer a regular pattern of holes (18) is made extending through the complete thickness of said layer.
Inventors
- 👤 Joseph Marie Elise Beaujean
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 13:55
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
103 words
Multilayer medium for recording optically readable information, comprising a semi reflective recording layer of a material which can melt, atomized or evaporate under the influence of light, a second transparent layer adjacent to one surface of said recording layer through which the recording or reading bundle of light is received, and a third layer adjacent to the other surface of said recording medium, whereby predetermined surface areas of the recording layer are directed to holes into the adjacent layer, characterized in that the holes are made into the third layer into a regular pattern and extending through the whole thickness of said layer.
Claim 2
Dependent Claim
103 words
Multilayer medium for recording optically readable information, comprising a semi reflective recording layer of a material which can melt, atomized or evaporate under the influence of light, a second transparent layer adjacent to one surface of said recording layer through which the recording or reading bundle of light is received, and a third layer adjacent to the other surface of said recording medium, whereby predetermined surface areas of the recording layer are directed to holes into the adjacent layer, characterized in that the holes are made into the third layer into a regular pattern and extending through the whole thickness of said layer.
Claim 3
Dependent Claim
28 words
Medium for recording the optically readable information according to claim 1, characterized in that the holes in said layer are round openings arranged according to a regular pattern.
Claim 4
Dependent Claim
40 words
Medium for recording optically readable information according to claim 1, characterized in that the holes in the recording layer have the form of slots, which might be rectangular and parallel to each other or concentrically and circular or spiraly shaped.
Claim 5
Dependent Claim
42 words
Medium for recording optically readable information according to one or more of the preceding claims, characterized in that in or onto the transparent substrate layer and/or the recording layer marks are applied indicating the position of the holes in the separating layer.
Claim 6
Dependent Claim
31 words
Medium for recording optically readable information according to one or more of the preceding claims, characterized in that that recording layer is only present above the holes in the separating layer.
Claim 7
Dependent Claim
31 words
Medium for recording optically readable information according to one or more of the preceding claims, characterized in that the surface of the separating layer adjacent to the recording layer is reflective.
Claim 8
Dependent Claim
38 words
Medium for recording optically readable information according to one or more of the preceding claims, characterized in that the surface of the separating layer opposite the recording layer including the holes therein is covered by a reflective layer.
Claim 9
Dependent Claim
22 words
Medium for recording optically readable in formation according to claim 7, characterized in that the reflective layer is a polished metal plate.
Claim 10
Dependent Claim
30 words
Medium for recording optically readable information according to claim 8, characterized in that the separating layer is made as integral part with and from the same material as said plate.
Claim 11
Dependent Claim
31 words
Medium for recording optically readable information according to one or more of the preceding claims, characterized in that between the recording layer and the separating layer a reflective layer is inserted.
Claim 12
Dependent Claim
36 words
Medium for recording optically readable information according to one or more of the preceding claims, characterized in that the material of the separating layer is a plastic material which is hardened by radiation with ultraviolet light.
Claim 13
Dependent Claim
34 words
Medium for recording optically readable information according to one or more of the preceding claims, characterized in that the recording layer is made of a material which melts under the influence of light radiation.
Claim 14
Dependent Claim
33 words
Medium for recording optically readable information according to claim 12, characterized in that the recording layer is made of tellurium, an alloy of tellurium, bismuth, or a double layer of bismuth and selenium.
Claim 15
Dependent Claim
29 words
Medium for recording optically readable information according to one or more of claims 1-11, characterized in that the recording layer completely or partly evaporates or sublimates under light radiation.
Claim 16
Dependent Claim
46 words
Medium for recording optically readable information according to claim 14, characterized in that the recording layer is made of PbS, Ga 2 Cl 6' a hydrid, a nitrid, a material to which hydrogen is absorbed, a alloy of zinc or an amalgam, such as tellurium amalgam.
Claim 17
Dependent Claim
39 words
Medium for recording optically readable information according to claim 13 of 15, characterized in that between the substrate layer and the recording layer a bonding layer is used comprising chromium, platinum or palladium or a combination of said metals.
Claim 18
Dependent Claim
41 words
Medium for recording optically readable information according to claim 7 and/or claim 10, eventually in combination with one or more of the further claims, characterized in that the reflective layer or layers are made of aluminum, rhodium, titanium or polished steel.
References Cited (Backward Citations)
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