EP0530699A1
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EP
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A rewritable recording medium and a method of recording in the same
Assignee: Panasonic Holdings Corp
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Filing: 1992-08-28
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Granted: —
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Expires: 2012-08-28
Abstract
Abstract A rewritable recording medium which can perform multi-color recording is provided. The recording medium comprises an optical absorption layer and an optically selective absorption layer sequentially stacked on a substrate, wherein the optically selective absorption layer includes a plurality of colored segments and a reversible thermosensitive recording matrix in contact with the colored segments, the reversible thermosensitive recording matrix being formed so as to cover the colored segments and so as to come in contact with the optical absorption layer, and changing in light transmittance in a reversible manner by application of heat.
Inventors
- 👤 Yoshio Kishimoto
- 👤 Masaaki Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 10:56
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/28; B41M5/34; B41M5/36; B41M5/363; G; G02; G02F; G02F1/00; G02F1/01; G02F1/0147; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901
Claims Analysis
Total Claims: 50
Claim 1
Independent Claim
78 words
A rewritable recording medium comprising an optical reflection layer and an optically selective absorption layer sequentially stacked on a substrate, wherein the optically selective absorption layer includes a plurality of colored segments and a reversible thermosensitive recording matrix in contact with the colored segments, the reversible thermosensitive recording matrix being formed so as to cover the colored segments at least on the medium surface side, and changing in light transmittance in a reversible manner by application of heat.
Claim 2
Dependent Claim
75 words
A rewritable recording medium according to claim 1, wherein the reversible thermosensitive recording matrix is made of a composition comprising organic crystalline microparticles and a transparent matrix polymer, the colored segments are a plurality of colored particles dispersed in the recording matrix made of the composition, and the organic crystalline microparticles change in crystalline state depending upon the heating and cooling process of the recording matrix, which changes the light transmittance of the recording matrix.
Claim 3
Dependent Claim
28 words
A rewritable recording medium according to claim 2, wherein the colored particles can transmit light of a prescribed wavelength, and absorb light of other wavelengths to generate heat.
Claim 4
Dependent Claim
27 words
A rewritable recording medium according to claim 2, wherein the colored particles are arranged in the recording matrix made of the composition substantially in a single layer.
Claim 5
Dependent Claim
17 words
A rewritable recording medium according to claim 3, wherein the colored particles exhibit a plurality of hues.
Claim 6
Dependent Claim
27 words
A rewritable recording medium according to claim 5, wherein the colored particles are a mixture of three primary colored particles which are red, green, and blue particles.
Claim 7
Dependent Claim
46 words
A rewritable recording medium according to claim 2, wherein the compound constituting at least the surface portion of the colored particles has a group which can facilitate the formation of a crystal nucleus of the organic crystalline microparticles in the recording matrix made of the composition.
Claim 8
Dependent Claim
39 words
A rewritable recording medium according to claim 7, wherein the compound constituting at least the surface portion of the colored particles, and the compound constituting the organic crystalline microparticles have a group capable of forming a hydrogen bond, respectively.
Claim 9
Dependent Claim
46 words
A rewritable recording medium according to claim 8, wherein the compound constituting the organic crystalline microparticles have at least one group selected from the group consisting of a carboxyl group and a hydroxyl group, and have a melting point in the range of 60 to 120°C.
Claim 10
Dependent Claim
35 words
A rewritable recording medium according to claim 2, wherein the colored particles are made of glass or a polymer, and spherical particles with a mean particle size in the range of 1 to 100 µm.
Claim 11
Dependent Claim
53 words
A recording medium according to claim 1, wherein the colored segments in the optically selective absorption layer are arranged on the top surface of the optical reflection layer to form a coloring layer, and a layer of the reversible thermosensitive recording matrix is formed on the coloring layer to form a recording layer.
Claim 12
Dependent Claim
40 words
A rewritable recording medium according to claim 11, wherein the colored segments are arranged in parallel with each other to form striped segments so that a plurality of colors corresponding to the striped segments are exhibited in a prescribed order.
Claim 13
Dependent Claim
29 words
A rewritable recording medium according to claim 11, wherein the colored segments can transmit light of a prescribed wavelength, and absorb light of the other wavelengths to generate heat.
Claim 14
Dependent Claim
17 words
A rewritable recording medium according to claim 11, wherein the colored segments exhibit a plurality of hues.
Claim 15
Dependent Claim
25 words
A rewritable recording medium according to claim 14, wherein the colored segments are colored in three primary colors which are red, green, and blue, respectively.
Claim 16
Dependent Claim
21 words
A rewritable recording medium according to claim 14, wherein the colored segments are colored in red, green, blue, and black, respectively.
Claim 17
Dependent Claim
56 words
A rewritable recording medium according to claim 11, wherein the reversible thermosensitive recording matrix is made of a composition comprising organic crystalline microparticles and a transparent matrix polymer, and the organic crystalline microparticles change in crystalline state depending upon the heating and cooling process of the recording matrix, which changes the light transmissibility of the matrix.
Claim 18
Dependent Claim
51 words
A rewritable recording medium according to claim 11, wherein the compound constituting at least a surface of the colored segments in contact with the recording layer, has a group which can facilitate the formation of a crystal nucleus of the organic crystalline microparticles in the recording matrix made of the composition.
Claim 19
Dependent Claim
44 words
A rewritable recording medium according to claim 18, wherein the compound constituting at least a surface of the colored segments in contact with the recording layer, and the compound constituting the organic crystalline microparticles have a group capable of forming a hydrogen bond, respectively.
Claim 20
Dependent Claim
46 words
A rewritable recording medium according to claim 19, wherein the compound constituting the organic crystalline microparticles have at least one group selected from the group consisting of a carboxyl group and a hydroxyl group, and have a melting point in the range of 60 to 120°C.
Claim 21
Dependent Claim
20 words
A rewritable recording medium according to claim 1, further comprising a transparent protection layer on the optically selective absorption layer.
Claim 22
Dependent Claim
83 words
A rewritable recording medium comprising an optical absorption layer and an optically selective absorption layer sequentially stacked on a substrate, wherein the optically selective absorption layer includes a plurality of colored segments and a reversible thermosensitive recording matrix in contact with the colored segments, the reversible thermosensitive recording matrix being formed so as to cover the colored segments and so as to come in contact with the optical absorption layer, and changing in light transmittance in a reversible manner by application of heat.
Claim 23
Dependent Claim
75 words
A rewritable recording medium according to claim 22, wherein the reversible thermosensitive recording matrix is made of a composition comprising organic crystalline microparticles and a transparent matrix polymer, the colored segments are a plurality of colored particles arranged in the matrix substantially in a single layer, and the organic crystalline microparticles change in crystalline state depending upon the heating and cooling process of the recording matrix, which changes the light transmittance of the recording matrix.
Claim 24
Dependent Claim
40 words
A rewritable recording medium according to claim 23, wherein the optically selective absorption layer further comprises a recording layer made of the reversible thermosensitive recording matrix at the interface between the optically selective absorption layer and the optical absorption layer.
Claim 25
Dependent Claim
29 words
A rewritable recording medium according to claim 23, wherein the colored particles can transmit light of a prescribed wavelength, and absorb light of the other wavelengths to generate heat.
Claim 26
Dependent Claim
17 words
A rewritable recording medium according to claim 25, wherein the colored segments exhibit a plurality of hues.
Claim 27
Dependent Claim
27 words
A rewritable recording medium according to claim 26, wherein the colored particles are a mixture of three primary colored particles which are red, green, and blue particles.
Claim 28
Dependent Claim
46 words
A rewritable recording medium according to claim 23, wherein the compound constituting at least the surface portion of the colored particles has a group which can facilitate the formation of a crystal nucleus of the organic crystalline microparticles in the recording matrix made of the composition.
Claim 29
Dependent Claim
36 words
A rewritable recording medium according to claim 28, wherein the compound constituting at least the surface portion of the colored particles, and the organic crystalline microparticles have a group capable of forming a hydrogen bond, respectively.
Claim 30
Dependent Claim
46 words
A rewritable recording medium according to claim 29, wherein the compound constituting the organic crystalline microparticles have at least one group selected from the group consisting of a carboxyl group and a hydroxyl group, and have a melting point in the range of 60 to 120°C.
Claim 31
Dependent Claim
35 words
A rewritable recording medium according to claim 23, wherein the colored particles are made of glass or a polymer, and spherical particles with a mean particle size in the range of 1 to 100 µm.
Claim 32
Dependent Claim
84 words
A rewritable recording medium according to claim 22, wherein the optically selective absorption layer comprises a second recording layer made of the reversible thermosensitive recording matrix formed on the optical absorption layer; a coloring layer including a plurality of colored segments formed on the second recording layer, and a first recording layer made of the reversible thermosensitive recording matrix formed on the coloring layer, and the colored segments are arranged along the top surface of the second recording layer to form a coloring layer.
Claim 33
Dependent Claim
40 words
A rewritable recording medium according to claim 32, wherein the colored segments are arranged in parallel with each other to form striped segments so that a plurality of colors corresponding to the striped segments are exhibited in a prescribed order.
Claim 34
Dependent Claim
29 words
A rewritable recording medium according to claim 32, wherein the colored segments can transmit light of a prescribed wavelength and absorbs light of the other wavelengths to generate heat.
Claim 35
Dependent Claim
17 words
A rewritable recording medium according to claim 32, wherein the colored segments exhibit a plurality of hues.
Claim 36
Dependent Claim
25 words
A rewritable recording medium according to claim 32, wherein the colored segments are colored in three primary colors which are red, green, and blue, respectively.
Claim 37
Dependent Claim
28 words
A rewritable recording medium according to claim 32, wherein the reversible thermosensitive recording matrix is made of a composition comprising organic crystalline microparticles and a transparent matrix polymer.
Claim 38
Dependent Claim
54 words
A rewritable recording medium according to claim 32, wherein the compound constituting at least a surface of the colored segments in contact with the first recording layer and the second recording layer, respectively, has a group which can facilitate the formation of a crystal nucleus of the organic crystalline microparticles in the recording matrix.
Claim 39
Dependent Claim
50 words
A rewritable recording medium according to claim 38, wherein the compound constituting at least a surface of the colored segments in contact with the first recording layer and the second recording layer, respectively, and the compound constituting the organic crystalline microparticles have a group capable of forming a hydrogen bond.
Claim 40
Dependent Claim
43 words
A rewritable recording medium according to claim 39, wherein the organic crystalline microparticles have at least one group selected from the group consisting of a carboxyl group and a hydroxyl group, and have a melting point in the range of 60 to 120°C.
Claim 41
Dependent Claim
19 words
A rewritable recording medium according to claim 32, wherein the colored segments are made of glass or a polymer.
Claim 42
Dependent Claim
20 words
A rewritable recording medium according to claim 22, further comprising a transparent protection layer on the optically selective absorption layer.
Claim 43
Independent Claim
189 words
A method of recording information in a rewritable recording medium comprising an optical reflection layer and an optically selective absorption layer Sequentially stacked on a substrate; wherein the optically selective absorption layer in the recording medium includes a plurality of colored segments, and a reversible thermosensitive recording matrix in contact with the colored segments, the reversible thermosensitive recording matrix being formed so as to cover the colored segments at least on the medium surface side, and changing in light transmittance in a reversible manner with application of heat; the recording method comprising the steps of: a) heating and cooling the reversible thermosensitive recording matrix in the optically selective absorption layer so that the matrix becomes light transmissible, b) detecting the color and position of each segment of the colored segments, and c) heating a portion of the reversible thermosensitive recording matrix which locates at the medium surface side of the desired segment in response to the information on the color and position of the segment, and an image signal to be recorded so that the portion of the reversible thermosensitive recording matrix scatters light, which masks the colored segments.
Claim 44
Dependent Claim
45 words
A method according to claim 43, wherein the colored segments are a plurality of colored particles arranged in the reversible thermosensitive recording matrix substantially in a single layer, and the application of heat is conducted by means of a thermal recording head or laser beam.
Claim 45
Dependent Claim
73 words
A method according to claim 43, wherein the colored segments in the optically selective absorption layer are arranged on the top surface of the optical reflection layer to form a coloring layer, a layer of the reversible thermosensitive recording matrix is formed on the coloring layer to form a recording layer, and the application of heat is conducted by heating the recording layer by means of a thermal recording head or laser beam.
Claim 46
Independent Claim
223 words
A method of recording information in a rewritable recording medium comprising an optical absorption layer and an optically selective absorption layer sequentially laminated on a substrate, wherein the optically selective absorption layer includes colored segments of three primary colors which are red, green, and blue, respectively, and a reversible thermosensitive recording matrix in contact with the colored segments, the reversible thermosensitive recording matrix being formed so as to cover the colored segments and so as to be in contact with the optical absorption layer, and changing in light transmittance in a reversible manner by application of heat, the method of recording comprising the steps of: a) heating and cooling the reversible thermosensitive recording matrix in the optically selective absorption layer so that the recording matrix becomes light transmissible, and b) irradiating the colored segments with light corresponding to an color image signal, whereby the optical absorption layer absorbs the light which has passed through the colored segments to generate heat, which causes a change of the reversible thermosensitive recording matrix in contact with the optical absorption layer to scatter light, so that the color of the segments is developed; while the colored segments which have absorbed light generate heat, which causes a change of the reversible thermosensitive recording matrix in contact with the segments to scatter light, so that the segments are masked.
Claim 47
Dependent Claim
94 words
A method according to claim 46, wherein the reversible thermosensitive recording matrix is made of a composition comprising organic crystalline microparticles and a transparent matrix polymer, the colored segments are a plurality of colored particles arranged in the matrix made of the composition substantially in a single layer, and the organic crystalline microparticles change in crystalline state due to the generation of heat of the optical absorption layer or the colored particles, which causes a change of the recording matrix in contact with the optical absorption layer or the colored particles to scatter light.
Claim 48
Dependent Claim
38 words
A method according to claim 47, wherein the optically selective absorption layer further comprises a recording layer made of the reversible thermosensitive recording matrix at the interface between the optically selective absorption layer and the optical absorption layer.
Claim 49
Dependent Claim
26 words
A method according to claim 48, wherein the generation of heat of the optical absorption layer causes a change of the recording layer to scatter light.
Claim 50
Dependent Claim
123 words
A method according to claim 46, wherein the optically selective absorption layer comprises a second recording layer made of the reversible thermosensitive recording matrix formed on the optical absorption layer; a coloring layer including a plurality of colored segments formed on the second recording layer, and a first recording layer made of the reversible thermosensitive recording matrix formed on the coloring layer, the colored segments are arranged along the top surface of the second recording layer to form a coloring layer, and the color of the colored segments is developed by a light reflection of the second recording layer in a light scattering state, while the colored segments absorbing the light are masked by the first recording layer in a light scattering state.
References Cited (Backward Citations)
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