JP3744012B2 - Information recording medium - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an information recording medium that records an image in a non-contact manner, and more particularly to an information recording medium that provides high security by easily determining that the information recording medium has been altered.
[0002]
[Prior art]
Conventionally, information recording media include identification cards such as plastic ID cards, driver's licenses, foreign national registration cards, passports, departure cards, student ID cards, employee ID cards, savings passbooks, credit cards, prepaid cards Proof cards etc. are known. As a method of recording on such an information recording medium, an information recording medium such as a plastic card is provided by controlling the thermal head by controlling the thermal head by contacting the thermal head directly on the surface of the plastic card or the like via a transfer ribbon. Image recording including characters on the surface is performed.
[0003]
[Problems to be solved by the invention]
However, when image recording is performed with such a thermal head, there is a problem that it is easy to alter a halftone image such as a character image or a face on the surface of the information recording medium, and security is low. In addition, once a halftone image such as a character image or face is formed with a thermal head or the like, the recorded image is formed inside even if the recorded image is formed inside by covering the information recording medium with a surface protective layer, etc. Since it cannot be easily determined that the image has been printed, a halftone image such as a character image or a face on the surface of the information recording medium is altered.
Furthermore, for the above-described flat internal recording image modification, it is relatively easy to modify the recording image after deleting the surface protective layer and then providing a new surface protective layer. There is still a problem that the security of the information recording medium and its image is low.
[0004]
Therefore, the present invention provides an information recording medium having high security that can be easily distinguished when the information recording medium is altered.
[0005]
[Means for Solving the Problems]
To achieve the above object, according to claim 1 of the present invention,
A heat-sensitive recording layer that is sensitive to laser light is formed on a support, and the heat-sensitive recording layer has a colored layer that is thermally destroyed by the laser light and is colored, and does not absorb laser light on the heat-sensitive recording layer. An information recording medium formed with a surface layer serving as an optical filter that transmits a wavelength region of laser light ,
Forming the thermosensitive recording layer on a support having a three-dimensional shape by changing the thickness in the thickness direction ;
At least the outermost layer portion of the surface layer is a heat-sensitive layer that thermally breaks at a temperature lower than the heat break temperature of the heat-sensitive recording layer.
[0006]
According to claim 2 of the present invention,
The heat-sensitive recording layer is composed of one or more layers in which a heat-sensitive agent that is thermally destroyed by laser light is impregnated with a photothermal conversion agent that absorbs laser light.
[0009]
According to claim 3 of the present invention,
A separation layer is provided between the support and the thermosensitive recording layer.
[0010]
Furthermore, according to claim 4 of the present invention,
The main component of the heat-sensitive recording layer is a leuco dye, a mixture of a leuco dye and a developer, a mixture of a leuco dye and a developer and a binder, a metal centered on tin, a resin and an organic polymer. The main component is at least one of a metal mainly composed of a mixture, a leuco dye in which a color developer and a color reducing agent are combined with a binder, and a crystal.
[0011]
[Action]
According to the information recording medium of claim 1 of the present invention, a colored layer that is thermally destroyed by a laser beam and is colored is formed on a support having a three-dimensional shape by changing the thickness in the thickness direction. Furthermore, since the upper surface of the colored layer is protected by the surface layer, the colored layer is thermally destroyed three-dimensionally and can be visually observed by irradiating the laser beam. Further, since the protected surface layer does not absorb the laser beam, the power attenuation amount of the laser beam passing through the colored layer is small.
In addition, if the surface layer is an optical filter that transmits the wavelength region of the laser beam, the laser beam and the like outside the specific wavelength region can be shielded, so that the effect of preventing alteration or alteration of recorded information can be significantly improved. Can do.
In addition, since at least the outermost surface layer of the surface layer is thermally destroyed at a temperature lower than the thermal destruction temperature of the heat-sensitive recording layer, for example, even if it is attempted to alter or tamper with contact heating recording means such as a thermal head or a thermal needle. Since the surface layer protecting the layer is first thermally destroyed, the forgery prevention effect is high.
[0012]
According to the information recording medium of claim 2, the heat-sensitive recording layer is composed of one or more layers in which a heat-sensitive agent that is thermally destroyed by laser light is impregnated with a light-to-heat conversion agent that absorbs laser light. Absorption capability is increased and the power of the beam can be reduced.
[0015]
Further, according to the information recording medium of claim 3 , since the separation layer is provided between the support and the heat-sensitive recording layer, if the surface layer or the heat-sensitive layer is peeled off to attempt alteration or alteration, The recording layer is separated and cannot be altered or altered.
[0016]
Further, according to the information recording medium of claim 4 , the main component of the heat-sensitive recording layer is leuco dye, a mixture of leuco dye and developer, leuco dye and mixture of developer and binder, tin. Since the main component is at least one of a metal centered on a metal, a metal centered on a mixture of a resin and an organic polymer, a leuco dye in which a developer and a color reducer are combined with a binder, and a crystal, Even if the energy by the laser is small, it is sufficiently colored and visualized.
[0017]
【Example】
Hereinafter, an information recording medium according to an embodiment of the present invention will be described with reference to the drawings.
[0018]
<Example 1>
First, FIGS. 1A to 1D show a cross-sectional configuration of an information recording medium for recording an image including characters in one embodiment.
In this embodiment, the information recording medium is, for example, a plastic card (P) such as an ID card or a driver's license, and the thickness is changed in an arc shape in the thickness direction as shown in FIG. The support (11), the thermosensitive recording layer (12), and the surface layer (13). Information recording media include ID cards, membership cards, prepaid cards, IC cards, credit cards, passports, departure cards, student ID cards, employee ID cards, savings passbooks, identification cards, patches, stickers, etc. Other inspection certificates, owner certificates, national registration cards in foreign countries, etc.
In this embodiment, the support (11) is a polymer material having a heat resistance equal to or higher than the heat sensitive temperature of the heat sensitive recording layer (12), such as polyvinyl chloride (PVC), polyethylene terephthalate (PET), ABS. Resin, phenol resin, polybutylene terephthalate (PBT), polycarbonate (PC), polypropylene (PP), polymethyl methacrylate (PMMA), polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) , Polyphenylene sulfide (PPS), and other polymeric materials, paper, wood, glass, and the like, but may also be a notebook or notebook type.
[0019]
Further, a heat-sensitive recording layer (12) is formed on the support (11) whose thickness is changed in an arc shape in the thickness direction as a portion for recording with laser light. The main component forming the heat-sensitive recording layer (12) is a leuco dye, a combination of a leuco dye and a developer, or a combination of a leuco dye, a developer and a binder. as,
3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide, 3,3-bis (p-dimethylaminophenyl) phthalide, 3- (p-dimethylaminophenyl) -3- (1,2 -Dimethylindol-3-yl) phthalide, 3- (p-dimethylaminophenyl) -3- (2-methylindol-3-yl) phthalide, 3,3 bis (1,2-dimethylindol-3-yl) -5-dimethylaminophthalide, 3,3-bis (1,2 dimethylindol-3-yl) -6-dimethylaminophthalide, 3,3 bis (9-ethylcarbazol-3-yl) -6-dimethyl Aminophthalide, 3,3-bis (2-phenylindol-3-yl) -6-dimethylaminophthalide, 3-p-dimethylaminophenyl-3- (1-methylpyrrolo) Tri-3-yl) -6-dimethylaminophthalide and the like, 4,4′-bis-dimethylaminobenzhydrylbenzyl ether, N-halophenyl-leucooramine, N-2,4, Diphenylmethane dyes such as 5-trichlorophenyl leucooramine, thiazine dyes such as benzoyl leucomethylene blue and p-nitrobenzoyl leucomethylene blue, 3-methyl-spirodinaphthylene, 3-ethyl-spiro-dinaphthobirane, 3-phenyl- Spiro dyes such as spiro-dinaphthobiran, 3-benzyl-spiro-dinaphthobiran, 3-methyl-naphtho (6′-methoxybenzo) spirobiran, 3-propyl-spiro-dibenzobilane, rhodamine-B-anilinolactam, rhodamine ( p-nitroanilino) lacta Lactam dyes such as rhodamine (o-chloroanilino) lactam, 3-dimethylamino-7-methoxyfluorane, 3-diethylamino-6-methoxyfluorane, 3-diethylamino-7-methoxyfluorane, 3-diethylamino- 7-chlorofluorane, 3-diethylamino 6-methyl-7-chlorofluorane, 3-diethylamino-6,7-dimethylfluorane, 3- (N-ethyl-Np-toluidino) -7-methylfluorane 3-diethylamino-7-acetyl-N-methylaminofluorane, 3-diethylamino-7-N-methylaminofluorane, 3-diethylamino-7-dibenzylaminofluorane, 3-diethylamino-7-N-chloroethyl -N-methylaminofluorane, 3-diethylamino-7-N-di Tylaminofluorane, 3- (N-ethyl-Np-toluidino) -6-methyl-7-phenylaminofluorane, 3- (N-ethyl-Np-toluidino) -6-methyl-7- (P-Toluidino) fluorane, 3-diethylamino-6-methyl-7-phenylaminofluorane, 3-diethylamino-7- (2-carbomethoxy-phenylamino) fluorane and the like can be mentioned.
[0020]
As a developer,
Inorganic acidic substances such as activated clay, acid clay, attabargite, bentonite, colloidal silica, aluminum silicate, 4-tert-butylphenol, 4-hydroxydiphenoxide, α-naphthol, β-naphthol, 4-hydroxyacetophenol, 4-tert -Octylcatechol, 2,2'-dihydroxydiphenol, 2,2'-methylenebis (4-methyl-6-tert-isobutylphenol), 4,4'-isopropylidenebis (2-tert-butylphenol), 4, 4′-sec-butylidenephenol, 4-phenylphenol, 4,4′-isopropylidenediphnylphenol, 2,2′-methylenebis (4-chlorophenol), hydroquinone, 4,4′-cyclohexylidynediphenol, Novolac type pheno Resin, phenolic compounds such as phenol polymer, benzoic acid, p-tert-butylbenzoic acid, trichlorobenzoic acid, tephthalic acid, 3-sec-butyl-4-hydroxybenzoic acid, 3-cyclohexyl-4-hydroxybenzoic acid 3,5-dimethyl-4-hydroxybenzoic acid, salicylic acid, 3-isopropylsalicylic acid, 3-tert-butylsalicylic acid, 3-benzylsalicylic acid, 3- (α-methylbenzyl) salicylic acid, 3-chloro-5- (α Aromatic methyl such as -methylbenzyl) salicylic acid, 3,5-di-tert-butylsalicylic acid, 3-phenyl-5- (α, α-dimethylbenzyl) salicylic acid, 3,5-di-α-methylbenzylsalicylic acid, etc. Acids and their phenolic compounds, aromatic carboxylic acids such as zinc, magne Ium, mention may be made of aluminum, calcium, titanium, manganese, tin, an organic acidic substance such as a salt with a polyvalent metal such as nickel or the like.
[0021]
As a binder,
Cellulose esters such as nitrocellulose, cellulose phosphate, cellulose propionate, cellulose acetate, cellulose butyrate, cellulose myristate, cellulose palmitate, cellulose acetate / propionate, cellulose acetate / butyrate, methyl cellulose, ethyl cellulose, propyl cellulose, etc. Cellulose ethers, polystyrene, polyvinyl chloride, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, polyvinyl alcohol, polyvinyl pyrrolidone, and other vinyl resins Styrene-butadiene copolymer, styrene-acrylonitrile copolymer, styrene-butadiene-acrylonitrile copolymer, vinyl chloride -Copolymer resins such as vinyl acetate copolymer, polymethyl acrylate, polybutyl acrylate , Acrylic resins such as polyacrylic acid, polymethacrylic acid, polyacrylamide and polyacrylonitrile, polyesters such as polyethylene terephthalate, poly (4,4′isopropylidenediphenylene-co-1,4-cyclohexylenedimethylene carbonate) , Poly (ethylenedioxy-3,3′-phenylene thiocarbonate), poly (4,4′-isopropylidene diphenylene carbonate-co-terephthalate), poly (4,4′-isopropylidene diphenylene carbonate), poly (4,4′-sec-butylidene diphenylene carbonate), poly (4,4′-isopropylidene diphenylene carbonate-block-oxyethylene) and other polyarylate resins, polyamides, polyimides, epoxy resins, phenols resin , Polyethylene, polypropylene, polyolefins such as chlorinated polyethylene, and the like.
Furthermore, in addition to these leuco dyes, it consists of any of tin, tin alloys such as tin and bismuth and antimony, low melting point metals such as Te, liquid crystals, and mixed systems of resins and organic polymers. .
If the thermal recording layer (12) alone cannot absorb a laser or the like efficiently, an organic dye such as polymethine, naphthoquinone, anthraquine, triphenylmethane, aminium, or diimmonium as a light absorber, Thermally sensitive light absorbers such as metal complexes such as phthalocyanine, naphthalocyanine, and dithiol, infrared absorbing glass containing Fe2 + and / or Cu2 +, and other metal oxides, metal sulfides, metal hydroxides, etc. A heat sensitive recording agent is provided in a layer form as a light absorbing layer.
[0022]
Furthermore, the surface layer (13) does not absorb laser light having a wavelength in the visible region and is equivalent to the thermal recording layer (12), or a polymer compound that thermally breaks at a lower temperature than the thermal recording layer (12), for example, Vinyl chloride, vinyl acetate, vinyl chloride-vinyl acetate copolymer, mixture of vinyl chloride-vinyl acetate copolymer and polyester, mixture of vinyl chloride-vinyl acetate copolymer and polymethyl methacrylate, polyester resin such as polyethylene terephthalate, epoxy A resin, polystyrene, polystyrene acrylate, or the like having at least one phase transformation temperature such as a glass transition temperature equal to or lower than that of the thermosensitive recording layer (12) is used.
[0023]
Next, as an example of the support (11) of the information recording medium, as shown in FIG. 1 (b), the center of the support is concave, and as shown in FIG. As shown in FIGS. 2A and 2B, the X direction and the Y direction in the scanning direction are shown in addition to the cross-sectional view shown in FIG. Various cross-sections are possible, such as those with different directions and patterns. Although these information recording media are not shown in the figure, those formed with a laser beam can be easily identified by the three-dimensionalization of the recorded image because the recorded image is on the inner surface of the information recording medium. Since it can be easily recognized that the information recording medium is altered or altered by pasting another image on the surface or the like, it can have very high security. In addition, when falsification or alteration is performed by a contact-type recording method such as a thermal head, the heat of the thermal head is transferred by heat conduction from the surface layer (13). However, the temperature is higher than that of the thermosensitive recording layer (12). As a result, it is found that the surface layer (13) is thermally destroyed before recording on the heat-sensitive recording layer (12), and that alteration, alteration, and the like have been performed. Furthermore, even if tampering or alteration is performed using a high-power optical head or the like, since the focal plane is different in the thickness direction of the support, the focal point does not focus on each surface of the thermal recording layer (12). I can't record. In this way, it becomes very difficult to tamper and alter.
[0024]
<Example 2>
Next, another embodiment of the information recording medium will be described.
The plastic card (P) in FIG. 3 has a leuco dye, leuco dye and developer, or leuco dye and developer and binder, etc. There is a thermosensitive recording layer (22) by a tin alloy system such as tin, bismuth and antimony, a low melting point metal system such as Te, a liquid crystal system, a mixed system of resin and organic polymer, etc., and this thermosensitive recording layer (22) As such, it is one that absorbs laser light or is premixed with a photothermal conversion agent, whereby the laser light absorbability is enhanced and protected by the surface layer (23).
[0025]
<Example 3>
Further, the plastic card (P) of FIG. 4 has a polymethine series, a naphthoquinone series, an anthrakin series, a triphenylmethane series, an aminium series, as shown above, on the thermosensitive recording layer (22) on the support (21). Organic dyes such as diimmonium-based, metal complexes such as phthalocyanine-based, naphthalocyanine-based, dithiol-based, infrared absorbing glass containing Fe2 + and / or Cu2 +, other metal oxides, metal sulfides, metal hydroxides The light absorption layer (25) made of a light absorber such as is separated, and the boundary between the surface layer (23) and the photothermal conversion layer (25) is slightly thermally destroyed when irradiated with laser light. Is centered on the light-to-heat conversion layer (25), so heat transfer by absorption of laser light from the surface layer (23) to the heat-sensitive recording layer as compared with the contact heating type recording method such as a thermal head. distance Is short and efficient. Therefore, the temperature rise of the surface layer (23) is less than that of the contact heating type recording method, and it is not subject to thermal destruction as can be seen from the appearance. Therefore, although recording with a laser beam is possible, tampering or alteration with a thermal head or the like cannot be performed.
[0026]
<Example 4>
FIG. 5 shows the photothermal conversion layer (25) formed in the deep part on the support (21). According to the plastic card (P) of FIG. 5, thermal destruction of the surface layer (23) due to laser light irradiation is eliminated.
[0027]
<Example 5>
In the plastic card (P) of FIG. 6, a heat-sensitive recording layer (22) is formed on a support (21), and further a photothermal conversion layer (25) is formed thereon, and the photothermal conversion layer (25) The top surface is a heat-resistant, heat-resistant fracture surface layer (28), and the outermost surface layer is tampered with as an easily heat-breakable surface layer (29) that is immediately thermally destroyed by direct heating to enhance the effect of preventing alteration.
[0028]
<Example 6>
Furthermore, the plastic card (P) shown in FIG. 7 is provided with a separation layer (30) on the upper surface of the support (21), so that the layer more than the thermosensitive recording layer (22) is peeled off from the support (21). If so, the separation layer (30) is peeled off. Incidentally, the separation layer (30) is not limited to the sixth embodiment, and needless to say, it can be applied to the layer structures of the first to fifth embodiments.
[0029]
【The invention's effect】
According to the information recording medium of the present invention, the colored layer that is thermally destroyed by the laser beam is provided on the support having a three-dimensional shape by changing the thickness in the thickness direction. Since the surface layer is protected by the surface layer, the colored layer is thermally destroyed three-dimensionally by irradiating the laser beam so that it can be visually observed. Further, since the surface layer as the protective layer does not absorb the laser beam, the power attenuation amount of the laser beam passing through the colored layer is small. In addition, the heat-sensitive recording layer is composed of one or more layers in which a heat-sensitive agent that is thermally destroyed by laser light is impregnated with a light-to-heat conversion agent that absorbs laser light, so that the ability to absorb laser light is increased and the beam power is reduced. It becomes possible. Furthermore, if the surface layer is an optical filter that transmits the wavelength region of the laser light, laser light and the like outside the specific wavelength region can be shielded, so that the effect of preventing falsification and alteration of image information can be significantly improved. it can.
[0030]
Further, according to the information recording medium of the present invention, at least the outermost surface layer portion of the surface layer is thermally destroyed at a temperature lower than the thermal destruction temperature of the heat-sensitive recording layer, so that, for example, contact heating recording such as a thermal head or a thermal needle Even if it is attempted to alter or tamper with the means, the surface layer protecting the heat-sensitive layer is first thermally destroyed, so that the effect of preventing forgery is high. In addition, since a separation layer is provided between the support and the heat-sensitive recording layer, if the surface layer or heat-sensitive layer is peeled off to alter or tamper with it, the heat-sensitive recording layer separates and cannot be altered or tampered with. End up.
[0031]
Further, according to the information recording medium of the present invention, the main component of the heat-sensitive recording layer is mainly leuco dye, a mixture of leuco dye and developer, a mixture of leuco dye and developer and binder, and tin. Since the main component is at least one of the following metals, metals mainly composed of a mixture of resin and organic polymer, leuco dyes in which developers and color reducers are combined with binders, and crystals: Even if the energy by is small, it is sufficiently colored and visualized.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory diagram (a) to (d) showing in cross section a laminated structure of an information recording medium for recording an image including characters according to an embodiment of the present invention.
FIGS. 2A and 2B are explanatory views showing a laminated structure of an information recording medium according to another embodiment of the present invention by a cross section (a) and a plane (b).
FIG. 3 is an explanatory diagram showing, in section, the laminated structure of an information recording medium in another embodiment of the present invention.
FIG. 4 is an explanatory view showing in cross section the laminated structure of the information recording medium in another embodiment of the present invention.
FIG. 5 is an explanatory diagram showing, in section, the laminated structure of the information recording medium in another embodiment of the present invention.
FIG. 6 is an explanatory diagram showing, in section, the laminated structure of the information recording medium in another embodiment of the present invention.
FIG. 7 is an explanatory view showing in cross section the laminated structure of an information recording medium in another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Support 12 ... Thermal recording layer 13 ... Surface layer 21 ... Support 22 ... Thermal recording layer 23 ... Surface layer 25 ... Photothermal conversion layer 28 ... Heat-resistant fracture surface layer 29 ... Heat-resistant fracture surface layer 30 ... Separation layer P ... plastic cards

Claims (4)

A heat-sensitive recording layer that is sensitive to laser light is formed on a support, and the heat-sensitive recording layer has a colored layer that is thermally destroyed by the laser light and is colored, and does not absorb laser light on the heat-sensitive recording layer. An information recording medium formed with a surface layer serving as an optical filter that transmits a wavelength region of laser light ,
Forming the thermosensitive recording layer on a support having a three-dimensional shape by changing the thickness in the thickness direction ;
An information recording medium, wherein at least the outermost surface layer portion of the surface layer is a heat-sensitive layer that is thermally destroyed at a temperature lower than a heat destruction temperature of the heat-sensitive recording layer.   2. The information recording medium according to claim 1, wherein the heat-sensitive recording layer is composed of one or more layers in which a heat-sensitive agent that is thermally destroyed by the laser light is impregnated with a light-heat converting agent that absorbs the laser light. The information recording medium according to claim 1 or 2, characterized in that a separating layer between the support and the heat-sensitive recording layer. The main component of the thermosensitive recording layer is a leuco dye, a mixture of a leuco dye and a developer, a mixture of a leuco dye and a developer and a binder, a metal centered on tin, a resin and an organic polymer. metal the mixture was centered, developer and Gen'irozai binder and a any combination of the leuco dye, according to claims 1 to 3, characterized in that it is mainly composed of at least one of the crystals Information recording media.

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