JP2001199180A - Information recording medium and recording method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording medium and its recording method, with which a display recording can be executed without applying a mechanical stress at the display recording to a card, the influence on the display recording is small even when a protective layer is formed thicker and the display recording with two colors different from each other can be executed selectively. SOLUTION: This information recording medium is formed of a base, a first light absorption layer formed on at least one side of the base, a first heat sensitive coloring layer formed on the first light absorption layer, a heat insulating intermediate layer formed on the first heat sensitive coloring layer, a second light absorption layer, which is formed on the heat insulating intermediate layer and the maximum light absorption wavelength region of which is different from that of the first light absorption layer, and a second heat sensitive coloring layer. By selectively shining laser beam having the wavelength within the maximum light absorption wavelength region of the respective light absorption layer, the heat sensitive coloring layer is selectively colored for the realization of display recording.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium such as a card capable of recording and displaying information by irradiating a laser beam, and a recording method therefor. And a recording method thereof.

[0002]

2. Description of the Related Art Conventionally, when an information recording medium such as a card is issued to its user, variable information such as an ID code and a name, which differs for each card, is displayed by various means on a card which has been prepared in advance. are doing. For example, embossing is performed by applying a partial pressure to a predetermined portion of the card base material to form an embossed character, or a metal thin film layer, a heat-sensitive layer, and a protective film are sequentially laminated on the card base material. In addition, there is known an image (character) forming and erasing method in which a heated thermal head is brought into contact with the surface of a card using a thermal head by utilizing a change in transparency depending on the temperature of the heat-sensitive layer to perform recording and display.

However, when characters are formed by the embossing process, mechanical stress is applied to the card base material, and there is a risk that the card base material is deformed. Also, when displaying with a thermal head with a thermal layer, if a protective layer such as an oversheet is formed too thick on the card surface, the heat of the thermal head will not be transmitted sufficiently to the thermal layer, so the protective layer should be formed as thin as possible. Or,
Further, since the protective layer is not provided, there is a danger that the card surface may be damaged due to rubbing or the like caused by the thermal head coming into contact with the card surface.

Further, in display recording using a conventional thermal head, the resolution of the thermal head is about 16 d at the maximum.
There is a limitation that even when it is desired to form a finer recorded image, it is not possible to display a finer recorded image even when it is desired to form a finer recorded image, and there is a problem that it cannot be applied when displaying fine characters or designs. In addition, when the thermal head is brought into contact with the card surface, the heat is always transmitted from the upper layer, and the heat around the contact area of the thermal head is also affected, and some color bleeding and fogging will inevitably occur. May be undesirable.

In these display recordings, since the heat-sensitive layer and the color-forming layer are of a single color, only one color can be displayed.
The displayed and recorded contents were difficult to see and were monotonous, and there was a limit in the design and it was plain.

[0006]

According to the present invention, display recording can be performed without applying mechanical stress when performing display recording on a card, and even when a protective layer such as an oversheet is formed thick. Provided is an information recording medium having a small influence on display recording and capable of selectively performing display recording using two different colors, and a recording method thereof.

[0007]

In order to achieve the above-mentioned object, an information recording medium according to a first aspect of the present invention comprises a base, a first light absorbing layer formed on at least one side of the base, and
A first heat-sensitive coloring layer formed on the first light-absorbing layer, a heat-insulating intermediate layer formed on the first heat-sensitive coloring layer, and a heat-insulating intermediate layer formed on the heat-insulating intermediate layer A second light absorbing layer having a different maximum light absorption wavelength region from the first light absorbing layer;
A second thermosensitive coloring layer formed on the second light absorbing layer.

Further, an information recording medium according to a second aspect of the present invention includes a base, a first light absorbing layer formed on at least one side of the base, and a first light absorbing layer formed on the first light absorbing layer. A first heat-sensitive coloring layer, a heat-insulating intermediate layer formed on the first heat-sensitive coloring layer, a second heat-sensitive coloring layer formed on the heat-insulating intermediate layer, and the second heat-sensitive coloring layer. Formed on the thermosensitive coloring layer,
A second light absorption layer having a maximum light absorption wavelength range different from that of the first light absorption layer;
And a light-absorbing layer.

Further, in the recording method for an information recording medium according to the third aspect of the present invention, the light-absorbing intermediate layer formed on at least one side of the substrate is sandwiched between the upper and lower layers of the heat-insulating intermediate layer. Layer and a thermosensitive coloring layer, respectively, are laminated, and light recording layers provided on the upper layer side and the lower layer side, respectively, are displayed and recorded on an information recording medium constituted by light absorbing layers having different maximum light absorption wavelength regions. In the method for recording an information recording medium, a laser beam having a wavelength within a maximum light absorption wavelength region of a light absorption layer provided on the upper layer side or the lower layer side is selected from above the information recording medium. By irradiating the heat-sensitive coloring layer, the heat-sensitive coloring layer provided on the upper layer side or the lower layer side of the heat-insulating intermediate layer is selectively colored to perform display recording.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the information recording medium and the recording method of the present invention will be described in detail. FIG. 1 is a cross-sectional view of a first embodiment of an information recording medium according to the present invention, and FIG. 2 is a diagram showing an information recording medium of the first embodiment irradiated with a laser to perform display recording on a first thermosensitive coloring layer. FIG. 3 is a view showing a state in which the information recording medium of the first embodiment is irradiated with a laser to perform display recording on the second thermosensitive coloring layer, and FIG. 4 is a view showing the present invention. FIG. 5 is a cross-sectional view of the information recording medium according to the second embodiment, and FIG. 5 is a diagram illustrating a state in which display recording is performed on the first thermosensitive coloring layer by irradiating the information recording medium of the second embodiment with laser. FIG. 4 is a diagram illustrating a state in which display recording is performed on a second thermosensitive coloring layer by irradiating a laser to the information recording medium of the second embodiment.

First, a first embodiment of the information recording medium according to the present invention will be described. As shown in FIG. 1, an information recording medium 1 according to a first embodiment of the present invention includes a sheet-shaped or plate-shaped base 2 and a first light absorbing layer 3 formed on at least one side of the base 2. A first thermosensitive coloring layer 4 formed on the first light absorbing layer 3; and a first thermosensitive coloring layer 4
A heat insulating intermediate layer 5 provided thereon, a second light absorbing layer 6 formed on the heat insulating intermediate layer 5, and a second light absorbing layer 6
The second heat-sensitive coloring layer 7 formed thereon and, if necessary, a protective layer 8 are laminated on the second heat-sensitive coloring layer 7.
At this time, the thermosensitive coloring layers 4, 7 and the light absorbing layers 3, 6
May be formed so as to cover the entire surface or only a part of the card shape.

The first light absorbing layer 3 and the second light absorbing layer 6 have different maximum light absorption wavelength ranges, and the respective light absorbing layers 3 and 6 receive laser light. By changing the absorption wavelength region that generates heat when the heat-sensitive coloring layers 4 and 7 are stacked independently of each other with the heat-insulating intermediate layer 5 interposed therebetween, the coloring can be performed independently.
That is, the heat insulating intermediate layer 5 is set in the middle, and the first
By providing the light absorbing layer 3 and the first heat-sensitive coloring layer 4 and the second light absorbing layer 6 and the second heat-sensitive coloring layer 7 above the light absorbing layer 3, heat energy due to the light-to-heat conversion effect of the laser light is provided. Has an effect on the first thermosensitive coloring layer 4 or the second thermosensitive coloring layer 7 separately, and it is possible to perform separated coloring using one and the same laser beam.

The base 2 is in the form of a sheet or a plate. For example, vinyl chloride, ABS resin, AS resin,
Polyester, polypropylene, styrene resin, acrylic, polycarbonate, vinyl chloride-vinyl acetate copolymer, synthetic resin such as PET-G, or paper, non-woven fabric,
A metal deposit or the like is used. In addition, a printed layer may be provided on the base 2 by printing a picture, pattern, character, or the like of a desired design by, for example, silk screen printing or offset printing.

The first light absorbing layer 3 and the second light absorbing layer 6 include a light absorbing material for converting light into heat, and include a first thermosensitive coloring layer 4 and a second thermosensitive coloring layer. Colorless or light-colored pigments are used in order not to hinder the color development of No. 7 and to further suppress the ground color. The first light absorbing layer 3 and the second light absorbing layer 6 are formed by mixing or mixing a light absorbing material with a binder such as a water-soluble resin, or by coating or printing. Examples of the light-absorbing material used for the first light-absorbing layer 3 and the second light-absorbing layer 6 include phthalocyanine-based, naphthalosinian-based, bisthiourea-based compounds, squarylium-based, azurenium-based, and the like.
Triphenylamine, trisazo, diphenylmethane, triphenylmethane, triallylmethane, quinone, naphthoquinone, anthraquinone, azo,
An immonium-based compound, a diimmonium-based compound, a special metal complex-based compound, a metal sulfide and a thiourea-based compound, a phosphorus compound and a copper compound, or the like can be used. A mixture of two or more of the above may be used.

The first heat-sensitive coloring layer 4 and the second heat-sensitive coloring layer 7 include an electron-donating dye precursor and an electron-accepting compound which are colored by a thermal melting reaction, and a sensitizer, a fading inhibitor, Fillers such as pigments and lubricants, dispersants, binders and the like are included. The first thermosensitive coloring layer 4 and the second thermosensitive coloring layer 7 are formed by coating, printing, etc. on the base 2. The layer is formed by gravure, roll coating, spray coating, dipping, or the like. As the electron-donating dye precursor, those that are adapted to this type of heat-sensitive material as leuco dyes, and in the case of full color, those that develop yellow, magenta, and cyan are selected, for example, triphenylmethane. System, fluoran system, phenothiazine system, auramine system,
There are spiropyran type, indolinophthalide type and the like.

The electron-accepting compound is used as a color developer in combination with an electron-donating dye precursor, has heat resistance enough to withstand hot press, and has a printing property. It is necessary to react with high sensitivity to the heat applied at the time of the reaction, and for example, the following compounds can be used. Phenolic substances such as bisphenol A, octylphosphonic acid, nonylphosphonic acid, decylphosphonic acid, dodecylphosphonic acid, tetradecylphosphonic acid, hexadecylphosphonic acid, octadecylphosphonic acid, eicosylphosphonic acid, etc. and α-hydroxyoctanoic Acids, α-hydroxydodecanoic acid, α-hydroxytetradecanoic acid, α-hydroxyoctadecanoic acid, α-thiodiphenyl acid, quinones and the like.

As the sensitizer, for example, 1-hydroxy-2
-Phenyl naphthoate, p-benzylbiphenyl, stearic acid amide, behenic acid amide, methylenebisstearic acid amide, dibenzyl oxalate, tolylbiphenyl ether, fatty acid amides and the like.

Examples of the anti-fading agent include analogs of a developer in which a hydroxyl group is blocked, organic metal salts such as zinc salts, and hindered phenols. Further, the pigment is required to have no hiding properties, a high oil absorption, a high pH, and no activity with respect to the dye. In addition, if it is a white pigment, it has the effect of scattering visible light and near-infrared light around,
Promotes the absorption of near-infrared light into the light absorber and increases the heat generation effect. Examples of the pigment include calcium carbonate, aluminum hydroxide, silicate, zeolite, silica, kaolin clay, and urea formalin resin.

As a binder, a water-soluble resin is mainly used as a main component, and polyvinyl alcohol, starch, modified starch, methylcellulose, hydroxyethylcellulose,
Gelatin, casein, alkylene-maleic anhydride copolymer, polyvinylpyrrolidone, acrylamide-based water-soluble resin, styrene-butadiene copolymer emulsion,
Examples include urea resins, melamine resins, amide resins, polyurethane resins, and the like. Further, various auxiliary agents can be added as needed. The first thermosensitive coloring layer 4 and the second thermosensitive coloring layer 7 may use different materials.

It is desirable that the heat-insulating intermediate layer 5 has no activity with respect to the dye and has no concealing property, and blocks heat from the first thermosensitive coloring layer 4 and the second thermosensitive coloring layer 7. Therefore, it is desirable to have a thickness of 1 to 3 μm. Examples of the material of the heat-insulating intermediate layer 5 include pigments such as calcium carbonate, aluminum hydroxide, silicate, zeolite, silica, kaolin clay, and urea formalin resin.
And polyvinyl alcohol, starch, modified starch,
Methylcellulose, hydroxyethylcellulose, gelatin, casein, alkylene-maleic anhydride copolymer, polyvinylpyrrolidone, acrylamide-based water-soluble resin, styrene-butadiene copolymer emulsion, urea resin, melamine resin, amide resin, polyurethane resin, etc. It is selected from binder resins, and is formed in a state where transparency is not particularly impaired and transmission of near-infrared light is not hindered.

Further, a protective layer 8 is formed on the second light absorbing layer 6.
May be provided. By providing the protective layer 8, each layer can be protected from adverse effects due to external heat, scratches, and the like at the time of forming. The protective layer 8 has chemical resistance, water resistance,
The binder resin has abrasion resistance and transparency, and may be selected from the above binder resins, and is usually formed to have a thickness of 0.1 to 10 μm. In particular, a thermosetting resin or an ionizing radiation-curable resin such as an ultraviolet ray or an electron beam is usually used in order to impart friction resistance, chemical resistance and stain resistance to the surface. Further, an anchor layer may be provided between the protective layer 8 and the second thermosensitive coloring layer 7 in order to enhance the adhesion.

The information recording medium 1 of the present invention can be applied to cards such as a credit card, a cash card, a membership card, and the like. This is effective when displaying and recording different individual information on a card. When performing display recording on the information recording medium 1 of the present invention, as shown in FIG.
0 is irradiated on the information recording medium 1 via the objective lens 11. At this time, the wavelength of the writing laser light 10 is set to the first
Irradiation according to the maximum absorption wavelength of the light absorbing layer 3 causes the first light absorbing layer 3 to generate heat, and the first heat absorbing layer 4 on the first light absorbing layer 3 is affected by this heat. Develops color. At this time, since the heat is blocked by the heat insulating intermediate layer 5, the second thermosensitive coloring layer 7 does not develop color.

The wavelength of the writing laser beam 10 is
By irradiating according to the maximum absorption wavelength of the second light absorption layer 6, the second light absorption layer 6 generates heat as shown in FIG. The upper second thermosensitive coloring layer 7 develops a color. At this time, since the heat is also blocked by the heat insulating intermediate layer 5, the first thermosensitive coloring layer 3 does not develop color.
In this way, by selectively irradiating the wavelength of the writing laser light 10, display and recording can be selectively performed on the two light absorbing layers.

Next, a second embodiment of the information recording medium according to the present invention will be described. As shown in FIG. 4, an information recording medium 1 according to a second embodiment of the present invention includes a sheet-shaped or plate-shaped base 2 and a first light-absorbing layer 3 formed on at least one side of the base 2. A first thermosensitive coloring layer 4 formed on the first light absorbing layer 3; and a first thermosensitive coloring layer 4
A heat-insulating intermediate layer 5 provided thereon, a second heat-sensitive coloring layer 7 formed on the heat-insulating intermediate layer 5, and a second light absorption formed on the second heat-sensitive coloring layer 7 A layer 6 and, if necessary, a protective layer 8 are laminated on the second light absorbing layer 6.

The information recording medium 1 according to the second embodiment includes a second thermosensitive coloring layer 7 formed on the heat insulating intermediate layer 5 and a second thermosensitive coloring layer 7.
In this state, the order of lamination of the light absorbing layers 6 is changed. According to the information recording medium 1 of the second embodiment, the first
Since the heat-insulating intermediate layer 5 and the second thermosensitive coloring layer 7 are laminated between the thermosensitive coloring layer 4 and the second light absorbing layer 6,
A second light absorbing layer 6 more than the information recording medium 1 of the first embodiment
This is preferable because the first thermosensitive coloring layer 4 is less susceptible to the influence of the heat generated in step (1).

When performing display recording on the information recording medium 1 of the second embodiment of the present invention, as shown in FIG.
Irradiation is performed on the information recording medium 1 via the optical disc 1. At this time, by irradiating the wavelength of the writing laser light 10 in accordance with the maximum absorption wavelength of the first light absorbing layer 3, the first light absorbing layer 3 generates heat, and the first light absorbing layer 3 is heated by the influence of the heat. The first thermosensitive coloring layer 4 on the light absorbing layer 3 develops a color. At this time, since the heat is blocked by the heat insulating intermediate layer 5, the second thermosensitive coloring layer 7 does not develop color.

The wavelength of the writing laser beam 10 is
By irradiating according to the maximum absorption wavelength of the second light absorption layer 6, the second light absorption layer 6 generates heat as shown in FIG. The lower second thermosensitive coloring layer 7 develops a color. At this time, the heat-insulating intermediate layer 5 and the second
Since the heat is blocked by the heat-sensitive coloring layer 7, the first heat-sensitive coloring layer 3 does not develop color. In this manner, by selectively irradiating the wavelength of the writing laser light 10, display and recording can be selectively performed on the two light absorbing layers.

Next, the recording method of the information recording medium of the present invention will be described. The recording method of the information recording medium of the present invention,
The information recording medium having the above-described configuration, that is, the light-absorbing layer and the thermosensitive coloring layer are formed on the upper and lower layers of the heat-insulating intermediate layer with the heat-insulating intermediate layer formed on at least one side of the substrate interposed therebetween. Recording of an information recording medium for performing display recording on an information recording medium in which light absorbing layers provided in layers and provided on the upper layer side and the lower layer side, respectively, are formed of light absorbing agents having different maximum light absorption wavelength regions. Is the way. Then, by selecting and irradiating a laser beam having a wavelength within the maximum light absorption wavelength region of the light absorbing layer provided on the upper layer side or the lower layer side from above the information recording medium, the heat insulating intermediate is selected. The thermosensitive coloring layer provided on the upper layer side or the lower layer side of the layer is selectively colored to display and record pictures, patterns, characters, images and the like.

When a pulse laser beam is used as the laser beam, light having a high output is irradiated only for a very short period of time, so that heat does not accumulate on the substrate or the like. This is preferable because design processing, drawing of characters, and the like can be performed without causing damage such as the above. Also,
By controlling the wavelength of the pulsed laser light, various types of different designs, design displays such as patterns, image information displays such as face photographs, and machine-readable information different for each information recording medium 1, for example, bar codes, Since display records such as OCR characters and OMR can be formed by different colors, a wide range of display records can be selected.

[0030]

Example 1 A polyethylene terephthalate film (E-20, manufactured by Toray Industries, Inc.) having a thickness of 188 μm was used as a substrate 2, and the first light absorbing layer 3 was formed on one surface of the substrate 2 by gravure printing. The information recording medium 1 was manufactured by laminating the first thermosensitive coloring layer 4, the heat insulating intermediate layer 5, the second light absorbing layer 6, the second thermosensitive coloring layer 7, and the protective layer 8 in this order. Here, the first light absorbing layer 3 is provided with a near-infrared light absorbing material (Titanium Co., Ltd.
X-304A) and a solvent (polyvinyl alcohol 10%)
An aqueous solution) and an isocyanate curing agent were mixed to form a film having a thickness of 1 to 2 μm after drying.

Subsequently, as a first thermosensitive coloring layer 4, a black dye (3- (N-ethyl-Nacylamino) -6-methyl-7-anilinofluorane), a developer (bisphenol A) and After drying with a solvent (10% aqueous solution of polyvinyl alcohol), a film was formed on the first light absorbing layer 3 so as to have a thickness of 5 μm.

Next, a 10% aqueous solution of polyvinyl alcohol was used as the heat-insulating intermediate layer 5 and formed to a thickness of 2 μm after drying. Further, as the second light absorbing layer 6,
As an infrared absorbing agent having an absorption at a longer wavelength side than the first light absorbing layer 3, a mixture of a solvent (10% aqueous solution of polyvinyl alcohol) of an ITO ultrafine particle powder and an isocyanate curing agent is dried and then dried. It was formed on the heat-insulating intermediate layer 5 so as to have a thickness of about 2 μm.

Subsequently, a red dye (3-diethylamino-7-chlorofluorane) was used as the second thermosensitive coloring layer 7.
, A developer (3,3-dichlorophenylthiourea) and a solvent (10% aqueous solution of polyvinyl alcohol) are dried, and then dried to a thickness of 5 μm on the first light absorbing layer 3. Formed. The dye and the developer used for the first thermosensitive coloring layer 4 and the second thermosensitive coloring layer 7 are sufficiently dispersed with a sand middle to form a coating material having an average particle size of 0.3 μm, and the visible light and near The transmittance of infrared light was minimized.

Further, the protective layer 8 for improving the weather resistance is made of an ultraviolet-curable resin (urethane acrylate) to form a second layer.
Formed on the light absorbing layer 6 of FIG. When writing was performed on the information recording medium manufactured as described above by irradiating a semiconductor laser beam having a wavelength of 780 nm, the first thermosensitive coloring layer 4 was colored black. When writing was performed by irradiating a semiconductor laser beam having a wavelength of 1300 nm, the second thermosensitive coloring layer 7 was colored red. At this time, no color bleeding was observed for both colors, and a clear display record was obtained.

[0035]

Second Embodiment In the second embodiment, in the lamination structure of the first embodiment, the laminating positions of the second light absorbing layer 6 and the second thermosensitive coloring layer 7 are exchanged, and the gravure is applied to one surface of the base 2. Using a printing method, the first light absorbing layer 3, the first thermosensitive coloring layer 4, the heat insulating intermediate layer 5, the second thermosensitive coloring layer 7, the second light absorbing layer 6,
The information recording medium 1 was manufactured by laminating the protective layer 8 in this order.
Then, when writing was performed by irradiating a semiconductor laser beam having a wavelength of 780 nm, the first thermosensitive coloring layer 4 was colored black. When writing was performed by irradiating a semiconductor laser beam having a wavelength of 1300 nm, the second thermosensitive coloring layer 7 was colored red. At this time, no color bleeding was observed for both colors, and a clear display record was obtained.

[0036]

As described above in detail, the information recording medium of the present invention can perform display recording without applying mechanical stress when performing display recording on a card. Even if the protective layer is formed thick, the effect on display recording is small, and display recording using two different colors can be selected and performed. Also,
By using a card as the information recording medium, it is possible to perform display recording without adversely affecting the card base material, particularly when displaying and recording individual information such as a name, an ID code, and the like that differ for each card user on the card. It is effective.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of an information recording medium according to the present invention.

FIG. 2 is a diagram illustrating a state in which display recording is performed on a first thermosensitive coloring layer by irradiating a laser to the information recording medium of the first embodiment.

FIG. 3 is a diagram illustrating a state in which display recording is performed on a second thermosensitive coloring layer by irradiating the information recording medium of the first embodiment with a laser.

FIG. 4 is a sectional view of a second embodiment of the information recording medium according to the present invention.

FIG. 5 is a diagram illustrating a state in which display recording is performed on a first thermosensitive coloring layer by irradiating a laser to an information recording medium of a second embodiment.

FIG. 6 is a diagram illustrating a state in which display recording is performed on a second thermosensitive coloring layer by irradiating a laser to the information recording medium of the second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 information recording medium 2 substrate 3 first light absorbing layer 4 first heat-sensitive coloring layer 5 heat-insulating intermediate layer 6 second light-absorbing layer 7 second heat-sensitive coloring layer 8 protective layer 9 laser light source 10 laser light 11 Objective lens 10 Coloring part

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B41M 5/18 Q 5/26 S G06K 19/00 CF term (Reference) 2C005 HA10 HB01 HB09 HB17 JA15 JB02 JB33 JC03 KA06 KA25 KA40 KA70 LA22 LB17 2H026 AA07 AA14 AA24 BB02 BB21 FF03 FF07 FF13 FF22 2H111 HA14 HA23 HA35 5B035 BA03 BB03

Claims (3)

[Claims] 1. A substrate, a first light absorbing layer formed on at least one side of the substrate, a first thermosensitive coloring layer formed on the first light absorbing layer, A heat-insulating intermediate layer formed on the first heat-sensitive coloring layer, and a second light-absorbing layer formed on the heat-insulating intermediate layer and having a maximum light absorption wavelength region different from that of the first light absorption layer. An information recording medium comprising: a second heat-sensitive coloring layer formed on the second light-absorbing layer. 2. A base, a first light absorbing layer formed on at least one side of the base, a first thermosensitive coloring layer formed on the first light absorbing layer, A heat-insulating intermediate layer formed on the first heat-sensitive coloring layer, a second heat-sensitive coloring layer formed on the heat-insulating intermediate layer, and a heat-sensitive coloring layer formed on the second heat-sensitive coloring layer. An information recording medium, comprising: the first light absorption layer and a second light absorption layer having a different maximum light absorption wavelength region. 3. A light-absorbing layer and a heat-sensitive coloring layer are respectively provided on an upper layer side and a lower layer side of the heat-insulating intermediate layer with a heat-insulating intermediate layer formed on at least one side of the substrate therebetween. A light absorption layer provided on each of the upper layer side and the lower layer side, an information recording medium configured with light absorption layers having different maximum light absorption wavelength regions, a recording method of an information recording medium performing display recording, From above the information recording medium, by selectively irradiating laser light having a wavelength within the maximum light absorption wavelength region of the light absorption layer provided on the upper layer side or the lower layer side,
A recording method for an information recording medium, wherein display recording is performed by selectively coloring a thermosensitive coloring layer provided on an upper layer side or a lower layer side of the heat insulating intermediate layer.