EP0158906A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical card
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1985-03-29
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Granted: —
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Expires: 2005-03-29
Abstract
Abstract An optical recording material comprising (1) a substrate, (II) a recording layer provided on said substrate, the recording layer consisting of light transmissive portions and light screening portions, and (III) a reflective metallic thin film layer provided on the recording layer; as well as a process therefor. The invention also includes an optical card comprising the optical recording material provided on a card substrate. In the cases of the optical recording material and the optical card, it is possible to readily carry out high density recording, the alternation of written information is difficult, and the written information can be read out on a basis of the difference in light reflectivity.
Inventors
- 👤 Mitsuru Takeda
- 👤 Wataru Kuramochi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 05:49
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/30; B42D25/36; B42D25/373; B42D25/20; B42D25/23; B42D25/351; B42D25/40; B42D25/405; B42D25/415; B42D25/42; B42D25/43; B42D25/435; B42D25/45; B42D25/46; B42D25/465; B42D25/47; G; G06; G06K; G06K1/00; G06K1/12; G06K1/126; G06K19/00; G06K19/06; G06K19/06009; G06K19/06046; G07; G07F; G07F7/00; G07F7/08; G07F7/086; G11; G11B; G11B13/00; G11B7/00; G11B7/002; G11B7/0033; G11B7/004; G11B7/005; G11B7/0052; G11B7/24; G11B7/24003; G11B7/24012; G11B7/241; G11B7/242; G11B7/243; G11B7/2433; G11B7/244; G11B7/251; G11B7/252; G11B7/258; G11B7/26; G11B2007/24302; G11B2007/24306; G11B2007/24308; G11B2007/24312; G11B2007/24316; G11B7/245; G11B7/246; G11B7/2467; G11B7/249; G11B7/253; G11B7/2533; G11B7/2535; G11B7/256; G11B7/2585; G11B7/259; G11B7/2595; Y; Y10; Y10S; Y10S283/00; Y10S283/904; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/24876; Y10T428/24893
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
77 words
An optical recording material comprising (I) a substrate, (II) a recording layer provided on said substrate, said recording layer consisting of light transmissive portions and light screening portions, and (III) a reflective thin film layer provided on said recording layer, wherein readout of information - written in said recording layer and/or said thin film layer is carried out by irradiating the optical recording material with a record playback light from the recording layer-free side of the substrate.
Claim 2
Dependent Claim
77 words
An optical recording material comprising (I) a substrate, (II) a recording layer provided on said substrate, said recording layer consisting of light transmissive portions and light screening portions, and (III) a reflective thin film layer provided on said recording layer, wherein readout of information - written in said recording layer and/or said thin film layer is carried out by irradiating the optical recording material with a record playback light from the recording layer-free side of the substrate.
Claim 3
Dependent Claim
39 words
The optical recording material according to claim 1 wherein said recording layer is a first recording layer and said thin film layer is a second - recording layer capable of writing information by irradiating it with an energy beam.
Claim 4
Dependent Claim
32 words
The optical recording material according to claim 1 wherein said recording layer is a first recording layer and said thin film layer is a second recording layer having recording pits formed therein.
Claim 5
Dependent Claim
40 words
The optical recording material according to claimsl or 2 wherein readout of information written in said recording layer is carried out by irradiating the optical recording material with a record playback light from the recording layer-free side of the substrate.
Claim 6
Dependent Claim
55 words
The optical recording material according to any of claimsl to 4 wherein said recording layer comprises a photosensitive material containing (a) a transparent resin as a binder, (b) a photodecomposable development restrainer having a diazo or azido group, and (c) a metal complex compound or a metal compound which is reduced to form metallic nuclei.
Claim 7
Dependent Claim
53 words
The optical recording material according to any of claims 1 to 5 wherein said thin film layer is a metallic thin film layer composed of a metal or alloy selected from the group consisting of Te, Zn, Pb, Cd, Bi, Sn, Se, In, Ga, Rb, Te-Se, Te-Se-Pb, Te-Pb, Te-Sn-S, Sn-Cu, Te-Cu and Te-Cu-Pb.
Claim 8
Dependent Claim
38 words
The optical recording material according to any of claims 1to 5 wherein said thin film layer is a metallic thin film layer composed of a metal selected from the group consisting of Al, Cr, Ni, Ag and Au.
Claim 9
Dependent Claim
58 words
The optical recording material according to any of claims 1 to 5 wherein said thin film layer is composed of a multilayer film selected from the group consisting of In/Te and SiO 2 /Ti/SiO 2 /Al, or of composite material selected from the group consisting of Te-CH 4 , Te-CS 2' Te-styrene, Sn-SO 2 , GeS-Sn and SnS-S.
Claim 10
Dependent Claim
50 words
The optical recording material according to any of claims 1 to 5 wherein said thin film layer is a thin film obtained by cohering a dyestuff, by dispersing the dyestuff or metal particles in thermosetting resins or by adhering the dyestuff or metal particles to the surface of said resins.
Claim 11
Dependent Claim
43 words
The optical recording material according to any of claims 1 to 5 wherein said thin film layer is composed of a compound selected from the group consisting of-Te oxide, Sb oxide, Mo oxide, Ge oxide, V oxide, Sm oxide, Te oxide and Te-Sn.
Claim 12
Dependent Claim
38 words
The optical recording material according to any of claims 1 to 5 wherein said thin film layer is composed of a material selected from the group consisting of chal- cogen, color formation type Mo03-Cu and MoO 3 -Sn-Cu.
Claim 13
Dependent Claim
39 words
The optical recording material according to any of claims 1 to 5 wherein said thin film layer is composed of a optomagnetic recording material selected from the group consisting of GdCo, TbCo, GdFe, DyFe, GdTbFe, GdFeBi, TbDyFe and MnCuBi.
Claim 14
Dependent Claim
41 words
The optical recording material according to any of claims 5 to 12 wherein said metal compound which is reduced to form metallic nuclei is a compound of a metal selected from the group consisting of Pd, Au, Ag, Pt and Cu.
Claim 15
Dependent Claim
15 words
The optical recording material according to claim 13 wherein said metal compound is palladium chloride.
Claim 16
Dependent Claim
70 words
A process for preparing an optical recording material which comprises the steps of applying onto a substrate a photosensitive material wherein any one of unexposed portions and exposed portions exhibits light transmission properties and the other exhibits light screening properties; then imagewise exposing the substrate provided with the photosensitive material; developing it to forming a recording layer; and thereafter forming a reflective metallic thin film layer on said recording layer.
Claim 17
Dependent Claim
70 words
A process for preparing an optical recording material which comprises the steps of applying onto a substrate a photosensitive material wherein any one of unexposed portions and exposed portions exhibits light transmission properties and the other exhibits light screening properties; then imagewise exposing the substrate provided with the photosensitive material; developing it to forming a recording layer; and thereafter forming a reflective metallic thin film layer on said recording layer.
Claim 18
Dependent Claim
39 words
The process according to claim 15 wherein the reflective thin film layer is formed and thereafter it is irradiated with an energy beam to provide recording spots, thereby forming said reflective thin film layer into a second recording layer.
Claim 19
Dependent Claim
36 words
The process according to claim 15 or 16 wherein in forming said recording layer, an aqueous solution containing both of a water-soluble reducible metallic salt and a reducing agent is employed as a physical developing solution.
Claim 20
Dependent Claim
30 words
The process according to claim 17 wherein said reducible metallic salt is a water-soluble salt of a metal selected from the group consisting of Ni, Co, Fe, Cr, and Cu.
Claim 21
Dependent Claim
38 words
The process according to claim 18 wherein said metallic salt is one member selected from the group consisting of halide, sulfate, and nitrate of a metal selected from the group consisting of Ni, Co, Fe, Cr, and Cu.
Claim 22
Dependent Claim
16 words
The process according to claim 19 wherein said metallic salt is a water-soluble salt of Ni.
Claim 23
Dependent Claim
95 words
An optical card comprising an optical recording material provided on a card sbustrate, said optical recording material comprising (a) a substrate for the optical recording material, (b) a recording layer provided at the lower surface of said substrate for the optical recording material, said recording layer consisting of light transmissive portions and light screening portions, and (c) a reflective thin film layer provided at the lower surface of said recording layer, wherein said optical recording material is provided on said card substrate so that said thin film layer comes into contact with said card substrate.
Claim 24
Dependent Claim
95 words
An optical card comprising an optical recording material provided on a card sbustrate, said optical recording material comprising (a) a substrate for the optical recording material, (b) a recording layer provided at the lower surface of said substrate for the optical recording material, said recording layer consisting of light transmissive portions and light screening portions, and (c) a reflective thin film layer provided at the lower surface of said recording layer, wherein said optical recording material is provided on said card substrate so that said thin film layer comes into contact with said card substrate.
Claim 25
Dependent Claim
26 words
The optical card according to claim 21 wherein said optical recording material and a card protective layer are provided on said card substrate in this order.
Claim 26
Dependent Claim
72 words
In an optical card according to claim 21 or u wnere- in it has an optical data recording region at a predetermined portion of a card surface and optical data recorded in said recording region are readout by means. of a line sensor, the improvement which comprises bars provided at a predetermined portion of said optical data recording region in a direction coinciding with the data readout direction of said line sensor.
References Cited (Backward Citations)
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