JP7102207B2 - Recording media, recording devices and methods - Google Patents

Description

Embodiments of the present invention relate to recording media, recording devices and methods.

Conventionally, the conventional method of performing full-color recording with a laser is roughly divided into the following two.
The first method is a method in which energy is applied by a laser to a medium in which color-developing layers of three primary colors having different threshold temperatures are laminated, and the color-developing layers of the three primary colors are selectively colored.

For example, Patent Document 1 discloses a method of selectively developing the three primary colors by moving the position where the laser light is focused by the lens up and down according to the layer to be colored.

Further, in Patent Document 2, heat is applied by a laser to a medium in which color-developing layers of three primary colors having different temperatures for each color are laminated to develop a color having a relatively low threshold temperature, and then ultraviolet rays are emitted. A method has been disclosed in which the heat sensitivity of the color-developing layer is lost by light and the color is changed so that the color does not develop even when heat is applied. This step is also performed for the color that develops at the second lowest temperature, and the color develops at the highest temperature. Complete full-color recording after the color is developed.

The second method is a method in which each layer carrying the three primary colors has absorption characteristics at different wavelengths, and lasers of three types of wavelengths are used to record each color.
For example, Patent Document 3 includes a multilayer body including at least one layer containing a laser-sensitive material, and completes full-color recording by absorbing laser light to record each color to develop or decolorize the laser beam. The method is disclosed.

Japanese Unexamined Patent Publication No. 2005-138558 Japanese Patent No. 3509246 Japanese Patent No. 4411394

However, in the first method, since a medium in which the color-developing layers of the three primary colors are laminated so as to decrease the threshold value from the surface layer toward the base material side is used, it is necessary to have three levels of the color development threshold values of each color, and the low-temperature color-developing layer. Then, since the color is developed at about 100 ° C., the low-temperature color-developing layer develops color due to hot water or the like, and there is a problem in heat resistance. In addition, since it takes a certain amount of time to transfer heat to the low-temperature color-developing layer, there is a risk that the total printing time will be long.

Further, in the second method, it is necessary to use lasers having three different wavelengths, which may increase the size of the apparatus and increase the cost.

The present invention has been made in view of the above, and while improving the heat resistance of the recording medium, it is possible to quickly record a full-color image with a simple configuration, and to simplify the apparatus configuration to reduce costs. It is to provide a recording medium, a recording device and a method capable of capable.

The recording medium of the embodiment is formed on a base material, a plurality of photothermal conversion layers having different wavelengths of light used for photothermal conversion, and a base material, which are laminated on the base material and arranged at positions separated from each other. It is provided with a color-developing layer that is laminated and develops color by transferring heat by photothermal conversion from any of the corresponding photothermal conversion layers, and is provided in at least one of the plurality of photothermal conversion layers. Is arranged so that the two color-developing layers having different color-developing threshold temperatures and color-developing colors are associated with each other.

FIG. 1 is an external front view of the recording medium (counterfeiting prevention medium) of the first embodiment in a state where information is recorded. FIG. 2 is a cross-sectional view of a configuration example of the recording medium of the first embodiment. FIG. 3 is an explanatory diagram of the thickness and thermal conductivity ratio of the recording medium of the first embodiment. FIG. 4 is an explanatory diagram of the light absorption characteristics of the photothermal conversion layer. FIG. 5 is a schematic block diagram of the laser recording apparatus of the first embodiment. FIG. 6 is an explanatory diagram of the reflectance of the gold (Au) mirror for each wavelength. FIG. 7 is an explanatory diagram of the transmittance of germanium (Ge) for each wavelength. FIG. 8 is an explanatory diagram of the transmittance of zinc selenium (ZnSe) for each wavelength. FIG. 9 is an operation processing flowchart of the laser recording device. FIG. 10 is a diagram for explaining the relationship between the energy of the laser light and the irradiation time in the first low temperature coloring layer and the first high temperature coloring layer. FIG. 11 is a diagram for explaining the relationship between the energy of the laser light and the irradiation time in the second low temperature coloring layer and the second high temperature coloring layer. FIG. 12 is an explanatory diagram of the color development control temperature of the first low temperature color development layer. FIG. 13 is an explanatory diagram of the color development control temperature of the first high temperature temperature development layer. FIG. 14 is an explanatory diagram of the color development control temperature of the second low temperature color development layer. FIG. 15 is an explanatory diagram of the color development control temperature of the second high temperature temperature development layer. FIG. 16 is a cross-sectional view of a configuration example of the recording medium of the first modification of the first embodiment. FIG. 17 is a cross-sectional view of a configuration example of the recording medium of the second modification of the first embodiment. FIG. 18 is a cross-sectional view of a configuration example of the recording medium of the third modification of the first embodiment. FIG. 19 is an explanatory diagram of a card-shaped recording medium in which the recording medium of the third modification is formed on a card substrate. FIG. 20 is a schematic block diagram of the laser recording apparatus of the second embodiment. FIG. 21 is an operation processing flowchart of the laser recording device of the second embodiment. FIG. 22 is a schematic block diagram of the laser recording apparatus of the third embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings.
[1] First Embodiment First, the recording medium of the first embodiment will be described.
FIG. 1 is an external front view of the recording medium (counterfeiting prevention medium) of the first embodiment in a state where information is recorded.

The recording medium 10 on which information is recorded is roughly classified into an image forming area ARG for recording an image and a specific information recording area ARI for recording specific information such as ID information, name, and issue date. ..

FIG. 2 is a cross-sectional view of a configuration example of the recording medium of the first embodiment.
FIG. 3 is an explanatory diagram of the thickness and thermal conductivity ratio of the recording medium of the first embodiment.
As shown in FIG. 1, the recording medium 10 has a first low-temperature coloring layer 12, an intermediate layer 13, a first high-temperature coloring layer 14, a photothermal conversion layer 15, an intermediate layer 16, and a second low-temperature coloring layer on the base material 11. 17, the intermediate layer 18, the second high-temperature coloring layer 19, the photothermal conversion layer (functional layer) 20A, and the photothermal conversion layer (protective layer) 20B are laminated in this order.
Here, the first low-temperature coloring layer 12, the first high-temperature coloring layer 14, the second low-temperature coloring layer 17, and the second high-temperature coloring layer 19 function as a heat-sensitive recording layer for image recording.
Further, the intermediate layer 13, the intermediate layer 16 and the intermediate layer 18 function as a heat insulating layer that suppresses heat transfer.

The base material 11 includes a first low-temperature coloring layer 12, an intermediate layer 13, a first high-temperature coloring layer 14, a photothermal conversion layer 15, an intermediate layer 16, a second low-temperature coloring layer 17, an intermediate layer 18, and a second high-temperature coloring layer. 19. Holds the photothermal conversion layer (functional layer) 20A and the photothermal conversion layer (protective layer) 20B.

Here, the thickness of the base material 11 is, for example, 100 μm, and the thermal conductivity ratio thereof is 0.01 to 5.00 W / m / K.

The first low-temperature color-developing layer 12 is a layer containing a temperature-indicating material as a heat-sensitive material that develops color when its temperature becomes the first threshold temperature T1 or higher.
Here, the thickness of the first low-temperature coloring layer 12 is, for example, 1 to 10 μm, and the thermal conductivity ratio thereof is 0.1 to 10 W / m / K.

The intermediate layer 13 is a layer that provides a thermal barrier when the first low temperature coloring layer 12 is not colored and suppresses heat transfer from the first high temperature coloring layer 14 side to the first low temperature coloring layer 12.
Here, the thickness of the intermediate layer 13 is, for example, 7 to 100 μm, and the thermal conductivity ratio thereof is 0.01 to 1 W / m / K.

The first high-temperature color-developing layer 14 is a layer containing a temperature-indicating material as a heat-sensitive material that develops color when the temperature becomes the second threshold temperature T2 (> T1) or higher.
Here, the thickness of the first high-temperature coloring layer 14 is, for example, 1 to 10 μm, and the thermal conductivity ratio thereof is 0.1 to 10 W / m / K.

The photothermal conversion layer 15 absorbs the first wavelength λ1 (for example, λ1 = 1064 nm) belonging to the near infrared rays and performs light / thermal conversion to perform light / heat conversion at least among the first low temperature coloring layer 12 and the first high temperature coloring layer 14. It is a layer that generates and transfers heat for developing one of them.
Here, the thickness of the photothermal conversion layer 15 is, for example, 0.5 to 30 μm, and the thermal conductivity ratio thereof is 0.01 to 1 W / m / K.

The intermediate layer 16 provides a thermal barrier at the time of coloring of the second low temperature coloring layer 17 or the second high temperature coloring layer 19, and is from the second low temperature coloring layer 17 side with respect to the first low temperature coloring layer 12 and the first high temperature coloring layer 14. It is a layer that suppresses heat transfer.
Here, the thickness of the intermediate layer 16 is, for example, 7 to 100 μm, and the thermal conductivity ratio thereof is 0.01 to 50 W / m / K.

The second low-temperature color-developing layer 17 is a layer containing a temperature-indicating material as a heat-sensitive material that develops color when the temperature becomes the third threshold temperature T3 or higher.
Here, the thickness of the second low-temperature coloring layer 17 is, for example, 1 to 10 μm, and the thermal conductivity ratio thereof is 0.1 to 10 W / m / K.

The intermediate layer 18 is a layer that provides a thermal barrier when the second low temperature coloring layer 17 is not colored and suppresses heat transfer from the second high temperature coloring layer 19 side to the second low temperature coloring layer 17.
Here, the thickness of the intermediate layer 18 is, for example, 7 to 100 μm, and the thermal conductivity ratio thereof is 0.01 to 1 W / m / K.

The second high-temperature color-developing layer 19 is a layer containing a temperature-indicating material as a heat-sensitive material that develops color when the temperature becomes the fourth threshold temperature T4 (> T3) or higher.
Here, the thickness of the second high-temperature coloring layer 19 is, for example, 1 to 10 μm, and the thermal conductivity ratio thereof is 0.1 to 10 W / m / K.

The photothermal conversion layer (functional layer) 20A absorbs a second wavelength λ2 (for example, λ2 = 9300 nm) belonging to far infrared rays and performs light / thermal conversion to perform a second low temperature coloring layer 17 and a second high temperature coloring layer 19. Of these, it is a layer that generates and transfers heat for developing color at least one of them. Further, specific functions of this photothermal conversion layer (functional layer) 20A include insertion of anti-counterfeiting items such as holograms, lenticular lenses, microarray lenses, and ultraviolet-excited fluorescent inks, and insertion of internal protection items such as ultraviolet cut layers. Or, it is a layer provided for using both of these functions.
Here, the thickness of the photothermal conversion layer 20A is, for example, 0.5 to 10 μm, and the thermal conductivity ratio thereof is 0.01 to 1 W / m / K.

Similar to the photothermal conversion layer (functional layer) 20A, the photothermal conversion layer (protective layer) 20B absorbs a second wavelength λ2 (for example, λ2 = 9300 nm) belonging to far infrared rays and performs light / heat conversion to perform light / heat conversion. 2 A layer that generates and transfers heat for developing color at least one of the low-temperature coloring layer 17 and the second high-temperature coloring layer 19. Further, the photothermal conversion layer 20B includes a first low temperature coloring layer 12, an intermediate layer 13, a first high temperature coloring layer 14, a photothermal conversion layer 15, an intermediate layer 16, a second low temperature coloring layer 17, an intermediate layer 18, and a second high temperature. This is a layer for protecting the color developing layer 19 and the photothermal conversion layer (functional layer) 20A.
Here, the thickness of the photothermal conversion layer 20B is, for example, 0.5 to 10 μm, and the thermal conductivity ratio thereof is 0.01 to 1 W / m / K.

In the following description, when only the function as a photothermal conversion layer is dealt with, the photothermal conversion layer (functional layer) 20A and the photothermal conversion layer (protective layer) 20B are referred to as a photothermal conversion layer 20 without distinction. And.

Further, in the above description, both the photothermal conversion layer (functional layer) 20A and the photothermal conversion layer (protective layer) 20B have a heat conversion function, but the photothermal conversion layer (functional layer) 20A and the photothermal conversion layer are provided. If one of the (protective layer) 20B has a photothermal conversion function, the other does not need to have a photothermal conversion function. In this case, it is more preferable that the photothermal conversion layer is closer to the color development layer from the viewpoint of heat conduction efficiency. Therefore, in the case of the above example, the photothermal conversion layer (a layer in contact with the second high temperature color development layer 19) ( Functional layer) 20A should be provided.

Here, the photothermal conversion layer 15 and the photothermal conversion layer 20 will be described in detail.
FIG. 4 is an explanatory diagram of the light absorption characteristics of the photothermal conversion layer.
As shown in FIG. 4, the photothermal conversion layer 15 has an absorption peak in the vicinity of a wavelength of 1000 nm, and further has a characteristic of absorbing infrared rays over almost the entire range at a wavelength of 2000 nm or more.

On the other hand, the photothermal conversion layer 20 has a property that it hardly absorbs (transmits) at a wavelength of 2000 nm or less and absorbs infrared rays over almost the entire range at 2000 nm or more.

Further, the intermediate layer 16, the second low temperature coloring layer 17, the intermediate layer 18 and the second high temperature coloring layer 19 have a first wavelength λ1 belonging to near infrared rays (for example, λ1 =) in both the non-coloring state and the coloring state. It is assumed that it is made of a material that transmits light (near infrared light) having (1064 nm). This is because light (near infrared light) having a first wavelength λ1 (for example, λ1 = 1064 nm) belonging to near infrared rays reaches the photothermal conversion layer 15.

Therefore, when near-infrared light having the first wavelength λ1 (for example, λ1 = 1064 nm) is incident from the photothermal conversion layer 20 side, the photothermal conversion layer 20 → the second high temperature coloring layer 19 → the intermediate layer 18 → Each layer is transmitted in the order of the second low temperature coloring layer 17 → the intermediate layer 16, and is almost absorbed by the photothermal conversion layer 15 and photothermally converted to develop the color of the first low temperature coloring layer 12 or the first high temperature coloring layer 14. Become.

On the other hand, when far-infrared light having a second wavelength λ2 (for example, λ2 = 9300 nm) is incident from the photothermal conversion layer 20 side, it is almost absorbed by the photothermal conversion layer 20 and reaches the photothermal conversion layer 15. Without this, photothermal conversion is performed to develop the color of the second low temperature coloring layer 17 or the second high temperature coloring layer 19.

Next, the materials constituting each layer will be described.
First, the base material 11 will be described.
The base material 11 includes polyester resin, polyethylene terephthalate (PET), glycol-modified polyester (PET-G), polypropylene (PP), polycarbonate (PP), and polychloride, which are generally used as card, paper, and film materials. It is possible to use a resin that can be processed into a film or plate, such as vinyl (PVC), styrene butadiene copolymer (SBR), polyacrylic resin, polyurethane resin, and polystyrene resin.

Further, it is also possible to add silica, titanium oxide, calcium carbonate, alumina or the like as a filler to the above-mentioned resin to use a resin having whiteness, surface smoothness, heat insulating property and the like as the base material 11.

For example, in addition to these, the papers and resin materials described in Japanese Patent No. 3889431, Japanese Patent No. 4215817, Japanese Patent No. 4329744, Japanese Patent No. 4391286, and the like can be used.

Specifically, polyethylene terephthalate (A-PET, PETG), polycyclohexane 1,4-dimethylphthalate (PCT), polystyrene (PS), polymethylmethacrylate (PMMA), transparent ABS (MABS), polypropylene (PP). , Polyethylene (PE), Polyvinyl Alcohol (PVA), Styrene butadiene Copolymer (SBR), Acrylic Resin, Acrylic Modified Urethane Resin, Styrene / Acrylic Resin, Ethylene / Acrylic Resin, Urethane Resin, Rosin Modified Maleic Acid Resin, Vinyl Chloride / Acetic Acid Vinyl copolymer, polyvinyl acetal resin, polyamide resin, hydroxyethyl cellulose, hydroxypropyl cellulose, nitrocellulose and other cellulose resins, polyolefin resins, polyamide resins, biodegradable resins, cellulose resins and other other resins, paper A base material, metal material, etc. can be used.

The above resins and fillers are examples, and other materials can be used as long as they satisfy workability and functionality.

In the above configuration, it is preferable to use a white to transparent resin.
Here, "transparency" means that the light transmittance in the visible light region is 30% or more on average in the visible light region.

Next, the first low temperature coloring layer 12, the first high temperature coloring layer 14, the second low temperature coloring layer 17, and the second high temperature coloring layer 19 will be described.
As the first low temperature coloring layer 12, the first high temperature coloring layer 14, the second low temperature coloring layer 17, and the second high temperature coloring layer 19, for example, highly transparent resins such as polyvinyl alcohol, polyvinyl acetate, and polyacrylic are used. As a binder, a leuco dye, a leuco dye or a temperature indicating material, and a color developer are used as a coloring material that develops a color when a certain threshold temperature is exceeded.
Examples of leuco dye, leuco dye or temperature indicating material include 3,3-bis (1-n-butyl-2-methyl-indole-3-yl) phthalide and 7- (1-butyl-2-methyl-1H-indole-). 3-yl) -7- (4-diethylamino-2-methyl-phenyl) -7H-flo [3,4-b] pyridine-5-one, 1- (2,4-dichloro-phenylcarbamoyl) -3, 3-Dimethyl-2-oxo-1-phenoxy-butyl]-(4-diethylamino-phenyl) -carbamic acid isobutyl ester, 3,3-bis (p-dimethylaminophenyl) phthalide, 3,3-bis (p-) Dimethylaminophenyl) -6-dimethylaminophthalide (also known as crystal violet lactone = CVL), 3,3-bis (p-dimethylaminophenyl) -6-aminophthalide, 3,3-bis (p-dimethylaminophenyl)- 6-Nitrophthalide, 3,3-bis 3-dimethylamino-7-methylfluorane, 3-diethylamino-7-chlorofluorane, 3-diethylamino-6-chloro-7-methylfluorane, 3-diethylamino-7- Anilinofluorane, 3-diethylamino-6-methyl-7-anilinofluorane, 2- (2-fluorophenylamino) -6-diethylaminofluorane, 2- (2-fluorophenylamino) -6-di- n-Butylaminofluorane, 3-piperidino-6-methyl-7-anilinofluorane, 3- (N-ethyl-p-toluidino) -7- (N-methylanilino) fluorane, 3- (N-ethyl- p-toluizino) -6-methyl-7-anilinofluorane, 3-N-ethyl-N-isoamylamino-6-methyl-7-anilinofluorane, 3-N-methyl-N-cyclohexylamino-6 -Methyl-7-anilinofluorane, 3-N, N-diethylamino-7-o-chloroanilinofluorane, rhodamine B lactam, 3-methylspirodinaphthopyran, 3-ethylspirinoftopyran, 3- It is possible to use a coloring dye such as benzylspironaftpyran.

Further, as the color developer, any acidic substance used as an electron acceptor in the thermal recorder can be used.
For example, inorganic substances such as active white clay and acidic white clay, inorganic acids, aromatic carboxylic acids, anhydrides thereof or metal salts thereof, organic sulfonic acids, other organic acids, organic color developeres such as phenolic compounds, etc. are revealed. Although it is mentioned as a colorant, a phenolic compound is preferable.

Specific examples of the color developer include bis3-allyl-4-hydroxyphenylsulfone, polyhydroxystyrene, zinc salt of 3,5-di-t-butylsalicylic acid, zinc salt of 3-octyl-5-methylsalicylic acid, and the like. Phenol, 4-phenylphenol, 4-hydroxyacetophenone, 2,2'-dihydroxydiphenyl, 2,2'-methylenebis (4-chlorophenol), 2,2'-methylenebis (4-methyl-6-t-butylphenol) , 4,4'-isopropyridene diphenol (also known as bisphenol A), 4,4'-isopropyridenebis (2-chlorophenol), 4,4'-isopropyridenebis (2-methylphenol), 4,4' Ethylene bis (2-methylphenol), 4,4'-thiobis (6-t-butyl-3-methylphenol), 1,1-bis (4-hydroxyphenyl) -cyclohexane, 2,2'-bis (4) -Hydroxyphenyl) -n-heptane, 4,4'-cyclohexylidenebis (2-isopropylphenol), 4,4'-sulfonyldiphenol and other phenolic compounds, salts of the phenolic compounds, salicylate anilide, novolak Examples thereof include type phenolic resins and benzyl p-hydroxybenzoate.

Further, as the intermediate layer 13, the intermediate layer 16 and the intermediate layer 18, polypropylene (PP), polyvinyl alcohol (PVA), styrene-butadiene copolymer (SBR), polystyrene, polyacrylic acid and the like can be used.

Next, the photothermal conversion layer 20 will be described.
As the photothermal conversion layer 20, a resin-based material that absorbs far infrared rays can be used, but basically, all resin-based materials can be used.

For example, PET-based resin, PETG, PVC-based resin, PVA-based resin, PC-based resin, PP-based resin, PE-based resin, ABS-based resin, polyamide-based resin, vinyl acetate-based resin and the like are typical examples. Further, a copolymer based on these and those to which additives such as silica, calcium carbonate, titanium oxide and carbon are added can also be used as the photothermal conversion layer 20.

Next, the photothermal conversion layer 15 will be described.
On the other hand, as the photothermal conversion layer 15, resin-based materials in general can be used, but it contains an infrared absorbing exothermic agent (near infrared absorbing exothermic agent) and a binder resin.

Then, the photothermal conversion layer 15 is formed by mixing and coating in a solvent so that the mass ratio of the solid content is infrared absorption exothermic agent: binder resin = 1 to 20:99 to 80. The film thickness at the time of coating is preferably 0.5 to 10 μm, more preferably 1 to 5 μm. This is for efficiently generating heat and facilitating control of the amount of heat generated.

As the infrared absorption exothermic agent, a polymethine-based cyanine dye, an azo-based dye, a naphthoquinone-based dye, an anthraquinone-based quinone-based dye, or the like can be used.

Examples of the binder resin include cellulose such as nitrocellulose, cellulose phosphate, cellulose sulfate, cellulose propionate, cellulose acetate, cellulose propionate, cellulose palmitate, cellulose myristate, cellulose acetate butyrate, and cellulose acetate propionate. Estels, polyester resins, hydroxyethyl cellulose, hydroxypropyl cellulose, ethyl cellulose, methyl cellulose, cellulose acetate and other cellulosic resins, polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, polyacrylamide and other vinyl resins, and other poly Acrylic resins such as methyl acrylate and polyacrylic acid, polyolefins such as polyethylene and polypropylene, polyacrylate resins, epoxy resins, phenol resins and the like can be used.

In particular, PET-based resins, PETG, PVC-based resins, PVA-based resins, PC-based resins, PP-based resins, PE-based resins, ABS-based resins, polyamide-based resins, vinyl acetate-based resins and the like are more preferable.
Further, a copolymer based on these or a product to which additives such as silica, calcium carbonate, titanium oxide and carbon are added can be used as the photothermal conversion layer 15.

Next, the laser recording apparatus of the first embodiment will be described.
FIG. 5 is a schematic block diagram of the laser recording apparatus of the first embodiment.
The laser recording apparatus 30 of the first embodiment includes a first laser oscillator 31 that outputs near-infrared laser light LNIR (= wavelength λ1) and a first beam expander 32 that expands the beam diameter of the near-infrared laser light LNIR. The beam diameter of the first mirror 33 that reflects the near-infrared laser light LNIR, the second laser oscillator 34 that outputs the far-infrared laser light LFIR (= wavelength λ2), and the far-infrared laser light LFIR is expanded. The second beam expander 35, the second mirror 36 that reflects the near-infrared laser light LNIR and transmits the far-infrared laser light LFIR, and the second mirror 36 that reflects the near-infrared laser light LNIR and the far-infrared laser light LFIR. A first direction with a first motor 38 that drives the one-way scan mirror 37 and drives the first-way scan mirror 37 to scan the near-infrared laser light LNIR and the far-infrared laser light LFIR in the first direction. The scanning unit 39 and the second-direction scan mirror 40 that reflects the near-infrared laser light LNIR and the far-infrared laser light LFIR are driven, and the near-infrared laser light LNIR and the far-infrared are driven in the second direction orthogonal to the first direction. Guided via a second-direction scanning unit 42 including a second motor 41 that drives a second-direction scanning mirror 40 to scan the external laser beam LFIR, a first-direction scanning unit 39, and a second-direction scanning unit 42. A condensing lens (F · θ lens) 43 that condenses the near-infrared laser light LNIR and the far-infrared laser light LFIR on the recording medium 10, and a stage 44 that conveys and holds the recording medium 10 at a predetermined position. , The calculation unit 45 that calculates the irradiation position and irradiation intensity of the far-infrared laser light LFIR and the near-infrared laser light LNIR based on the input input image data GD, and the first calculation unit 45 based on the calculation result of the calculation unit 45. The output control unit 46 that controls the laser output of the laser oscillator 31 and the second laser oscillator 34, and the first motor 38 and the second motor 41 are controlled based on the calculation results of the calculation unit 45, and the near-infrared laser light LNIR and It includes an irradiation position control unit 47 that controls an irradiation position of the far-infrared laser light LFIR on the recording medium 10.

In the above configuration, as the first laser oscillator 31, it is possible to use a semiconductor laser, a fiber laser, a YAG laser, a YVO ₄ laser, or the like, which are lasers in the near infrared region.
Further, as the second laser oscillator 34, a carbon dioxide laser or the like can be used.

Here, the materials of the first mirror 33, the second mirror 36, the first direction scan mirror 37, the second direction scan mirror 40, and the condenser lens (F · θ lens) 43 will be described.
FIG. 6 is an explanatory diagram of the reflectance of the gold (Au) mirror for each wavelength.
In the above configuration, the first mirror 33 reflects the near-infrared laser light LNIR, and the first-direction scan mirror 37 and the second-direction scan mirror 40 reflect the near-infrared laser light LNIR and the far-infrared laser light LFIR. There is a need.

Therefore, as the first mirror 33, the first-direction scan mirror 37, and the second-direction scan mirror 40, as shown in FIG. 6, a gold mirror that reflects the near-infrared laser light LNIR and the far-infrared laser light LFIR is used. Be done.

FIG. 7 is an explanatory diagram of the transmittance of germanium (Ge) for each wavelength.
Further, the second mirror 36 needs to reflect the infrared laser light LNIR and transmit the far infrared laser light LFIR.
Therefore, as the second mirror 36, as shown in FIG. 7, a germanium mirror using germanium that reflects the near-infrared laser light LNIR and transmits the far-infrared laser light LFIR is used.

FIG. 8 is an explanatory diagram of the transmittance of zinc selenium (ZnSe) for each wavelength.
Further, the condenser lens (F · θ lens) 42 needs to transmit the near-infrared laser light LNIR and the far-infrared laser light LFIR.
Therefore, as the condenser lens (F · θ lens) 42, as shown in FIG. 8, zinc selenium that transmits the near-infrared laser light LNIR and the far-infrared laser light LFIR is used.

Next, the recording process on the recording medium 10 in the laser recording apparatus 30 will be described.
FIG. 9 is an operation processing flowchart of the laser recording device.
In the following description, the first low temperature coloring layer 12 is a black (K) coloring layer, the first high temperature coloring layer 14 is a cyan (C) coloring layer, and the second low temperature coloring layer 17 is a magenta (M) coloring layer. , The second high temperature coloring layer 19 is assumed to be a yellow (Y) coloring layer.

First, when the input image data GD as RGB data is input (step S11), the calculation unit 45 of the laser recording device 30 analyzes the input image data GD and converts it into pixel-by-pixel color data (CMYK data) (step S11). Step S12).
Subsequently, the calculation unit 45 converts the color data into laser irradiation parameter values according to the combination of layers to be colored based on the color data for each pixel (step S13).

Here, as the laser irradiation parameter value, specifically, either far-infrared laser light LFIR or near-infrared laser light LNIR is selected (wavelength selection value), power setting value, scanning speed setting value, pulse width setting value. , Irradiation repeat number set value, scanning pitch set value, etc.
Subsequently, based on the laser irradiation parameter value set in step S13, image recording for causing the first low temperature coloring layer 12 and the first high temperature coloring layer 14 to develop colors using the near infrared laser beam LNIR is performed. (Step S14).

Next, the color development control in each color development layer will be described.
In the following description, for ease of understanding, the first threshold temperature T1 and the third threshold temperature T3 are equal, and the second threshold temperature T2 and the fourth threshold temperature T4 are equal.

First, the image recording for the first low temperature coloring layer 12 and the first high temperature coloring layer 14 will be described in detail.

As described above, the first low temperature coloring layer 12 develops color when its temperature becomes the first threshold temperature T1 or higher, and the first high temperature coloring layer 14 develops its color when its temperature becomes the second threshold temperature T2 (> T1) or higher. Color develops.

FIG. 10 is a diagram for explaining the relationship between the energy of the laser light and the irradiation time in the first low temperature coloring layer and the first high temperature coloring layer.

As shown in FIG. 10, the first low-temperature color-developing layer 12 develops color in the upper right region of the corresponding color-developing curve CL1 (the color-developing region of the first low-temperature color-developing layer 12).
Further, the first high-temperature color-developing layer 14 develops color in the upper right region of the corresponding color-developing curve CH1 (the color-developing region of the first high-temperature color-developing layer 14).

Therefore, in the region ARL1 common to the coloring region of the first low-temperature coloring layer 12 and the non-coloring region of the first high-temperature coloring layer 14, the first of the first low-temperature coloring layer 12 and the first high-temperature coloring layer 14 Only the low temperature coloring layer 12 develops color. That is, in the present embodiment, black (K) is developed.

Similarly, in the region ARH1 common to the coloring region of the first high-temperature coloring layer 14 and the non-coloring region of the first low-temperature coloring layer 12, among the first low-temperature coloring layer 12 and the first high-temperature coloring layer 14, the first 1 Only the high temperature coloring layer 14 develops color. That is, in the present embodiment, cyan (C) is colored.

Further, in the region ARLH1 common to the coloring region of the first low temperature coloring layer 12 and the coloring region of the first high temperature coloring layer 14, the first low temperature coloring layer 12 and the first high temperature coloring layer 14 develop color. That is, in the present embodiment, black (K) and cyan (C) are colored.

Next, the image recording for the second low temperature coloring layer 17 and the second high temperature coloring layer 19 will be described in detail.
As described above, the second low temperature coloring layer 17 develops color when its temperature becomes the third threshold temperature T3 or higher, and the second high temperature coloring layer 19 develops its color when its temperature becomes the fourth threshold temperature T4 (> T3) or higher. Color develops.

FIG. 11 is a diagram for explaining the relationship between the energy of the laser light and the irradiation time in the second low temperature coloring layer and the second high temperature coloring layer.
As shown in FIG. 11, the second low-temperature color-developing layer 17 develops color in the upper right region of the corresponding color-developing curve CH1 (the color-developing region of the second low-temperature color-developing layer 17).
Further, the second high-temperature color-developing layer 19 develops color in the upper right region of the corresponding color-developing curve CH2 (the color-developing region of the second high-temperature color-developing layer 19).

Therefore, in the region ARL2 common to the coloring region of the second low-temperature coloring layer 17 and the non-coloring region of the second high-temperature coloring layer 19, the second of the second low-temperature coloring layer 17 and the second high-temperature coloring layer 19 Only the low temperature coloring layer 17 develops color. That is, in this embodiment, magenta (M) develops color.

Similarly, in the region ARH2 common to the coloring region of the second high-temperature coloring layer 19 and the non-coloring region of the second low-temperature coloring layer 17, among the second low-temperature coloring layer 17 and the second high-temperature coloring layer 19, the second 2 Only the high temperature coloring layer 19 develops color. That is, in the present embodiment, yellow (Y) is developed.

Further, in the region ARLH1 common to the coloring region of the first low temperature coloring layer 12 and the coloring region of the first high temperature coloring layer 14, the first low temperature coloring layer 12 and the first high temperature coloring layer 14 develop color. That is, in the present embodiment, magenta (M) and yellow (Y) are colored.

Hereinafter, more specific color development control will be described.
First, the color development control of the first low temperature color development layer 12 will be described.
FIG. 12 is an explanatory diagram of the color development control temperature of the first low temperature color development layer.
When the first low-temperature color-developing layer 12 is to be colored, it is necessary to generate heat in the photothermal conversion layer 15, so that the near-infrared laser light LNIR (wavelength λ1) is selected and the recording medium 10 is irradiated. Become.

That is, the first laser oscillator 31 of the laser recording device 30 is driven, and the first laser oscillator 31 outputs the near-infrared laser light LNIR (= wavelength λ1) to the first beam expander 32.
The first beam expander 32 expands the beam diameter of the near-infrared laser light LNIR and emits the light to the first mirror 33 side.

As a result, the first mirror 33 reflects the near-infrared laser beam LNIR and guides it to the first-direction scan mirror 37 of the first-direction scanning unit 39.
The first-direction scan mirror 37 is driven by the first motor 38 and reflects the near-infrared laser beam LNIR in the direction corresponding to the scanning position in the first direction (for example, the X direction), and the second-direction scan mirror 40 Lead to.

The second-direction scan mirror 40 is driven by the second motor 41 and reflects the near-infrared laser light LNIR in the direction corresponding to the scanning position in the second direction (for example, the Y direction orthogonal to the X direction) to collect the near-infrared laser light LNIR. Lead to the optical lens 43.

As a result, the condenser lens 43 concentrates the near-infrared laser light LNIR toward a predetermined scanning position guided via the first-direction scanning unit 39 and the second-direction scanning unit 42, and the recording medium 10 Irradiate on.

At this time, as shown in FIG. 12, the temperature of the photothermal conversion layer 15 exceeds the first threshold temperature T1 corresponding to the first low temperature coloring layer 12 and exceeds the second threshold temperature T2 corresponding to the first high temperature coloring layer 14. The near-infrared laser light LNIR is irradiated by setting the laser irradiation parameter value so as not to be present.

As a result, the near-infrared laser light LNIR reaches the photothermal conversion layer 15 via the photothermal conversion layer 20, the second high-temperature coloring layer 19, the intermediate layer 18, the second low-temperature coloring layer 17, and the intermediate layer 16.
Since the photothermal conversion layer 15 absorbs the near-infrared laser light LNIR, performs light-heat conversion, and generates heat, the temperature of the first high-temperature coloring layer 14 closer to the photothermal conversion layer 15 gradually rises, and the photothermal heat is generated. It becomes almost equal to the temperature of the conversion layer 15.

On the other hand, heat is conducted from the photothermal conversion layer 15 to the first low temperature coloring layer 12 via the first high temperature coloring layer 14 and the intermediate layer 13, and as shown in FIG. 12, the temperature of the first low temperature coloring layer 12 gradually increases. By the time the temperature rises and the irradiation of the near-infrared laser light LNIR is completed, the temperature of the first low temperature coloring layer 12 exceeds the first threshold temperature T1, and the first low temperature coloring layer 12 becomes black (K). It will develop color.

Next, the color development control of the first high temperature color development layer 14 will be described.
FIG. 13 is an explanatory diagram of the color development control temperature of the first high temperature temperature development layer.
Since it is necessary to generate heat in the photothermal conversion layer 15 also when the first high-temperature color-developing layer 14 is to be colored, the near-infrared laser light LNIR (wavelength λ1) is selected and the recording medium 10 is irradiated. Become.

Then, as shown in FIG. 13, the temperature of the photothermal conversion layer 15 does not exceed the first threshold temperature T1 corresponding to the first low temperature coloring layer 12 and exceeds the second threshold temperature T2 corresponding to the first high temperature coloring layer 14. The laser irradiation parameter value is set so as to irradiate the near-infrared laser beam LNIR.
As a result, the near-infrared laser light LNIR reaches the photothermal conversion layer 15 via the photothermal conversion layer 20, the second high-temperature coloring layer 19, the intermediate layer 18, the second low-temperature coloring layer 17, and the intermediate layer 16.

In this case, the near-infrared laser light LNIR that irradiates the photothermal conversion layer 15 rapidly increases the amount of heat generated and shortens the heat generation time as compared with the case where the first low-temperature color-developing layer 12 is colored. The value is set.

Therefore, since the photothermal conversion layer 15 absorbs the near-infrared laser light LNIR, performs light-heat conversion, and generates heat rapidly, the temperature of the first high-temperature coloring layer 14 closer to the photothermal conversion layer 15 suddenly changes. The temperature rises and exceeds the second threshold temperature T2, and the first high-temperature coloring layer 14 develops cyan (C).

On the other hand, heat is conducted from the photothermal conversion layer 15 to the first low temperature coloring layer 12 via the first high temperature coloring layer 14 and the intermediate layer 13, but as shown in FIG. 13, the time for heat conduction is short. Since the amount of heat (heat energy) transferred to the first low temperature coloring layer 12 is small, the temperature rise of the first low temperature coloring layer 12 is small, and the temperature of the first low temperature coloring layer 12 exceeds the first threshold temperature T1. There is no such thing, and the first low temperature coloring layer 12 does not develop color.

Subsequently, the irradiation wavelength is changed so as to use the far-infrared laser light LFIR (step S15).
Then, based on the laser irradiation parameter value set in step S13, image recording for causing the second low temperature coloring layer 17 and the second high temperature coloring layer 19 to develop color is performed using the far infrared laser light LFIR. (Step S16).

That is, the second laser oscillator 34 of the laser recording device 30 is driven, and the second laser oscillator 34 outputs the far-infrared laser light LFIR (= wavelength λ2) to the second beam expander 35.

The second beam expander 35 expands the beam diameter of the far-infrared laser light LFIR and emits the light to the first mirror 33 side.
As a result, the first mirror 33 transmits the far-infrared laser light LFIR and guides the first mirror 33 to the first-direction scan mirror 37 of the first-direction scanning unit 39.

The first-direction scan mirror 37 is driven by the first motor 38 and reflects the far-infrared laser beam LFIR in the direction corresponding to the scanning position in the first direction (for example, the X direction), and the second-direction scan mirror 40 Lead to.

The second-direction scan mirror 40 is driven by the second motor 41 and reflects the far-infrared laser light LFIR in the direction corresponding to the scanning position in the second direction (for example, the Y direction orthogonal to the X direction) to collect the far-infrared laser light LFIR. Lead to the optical lens 43.

As a result, the condensing lens 43 condenses the far-infrared laser light LFIR toward a predetermined scanning position guided via the first-direction scanning unit 39 and the second-direction scanning unit 42, and the condensing lens 43 condenses the far-infrared laser light LFIR toward the recording medium 10. Irradiate on.

Next, the color development control of the second low temperature color development layer 17 will be described.
FIG. 14 is an explanatory diagram of the color development control temperature of the second low temperature color development layer.
When the second low-temperature color-developing layer 17 is to be colored, it is necessary to generate heat in the photothermal conversion layer 20, so that the far-infrared laser light LFIR (wavelength λ2) is selected and the recording medium 10 is irradiated. Become.

Then, as shown in FIG. 14, the temperature of the photothermal conversion layer 20 exceeds the third threshold temperature T3 corresponding to the second low temperature coloring layer 17, and does not exceed the fourth threshold temperature T4 corresponding to the second high temperature coloring layer 19. The laser irradiation parameter value is set so as to irradiate the photothermal conversion layer 20 with the far-infrared laser light LFIR.

As a result, the photothermal conversion layer 20 absorbs the far-infrared laser light LFIR, performs light-heat conversion, and generates heat. Therefore, the temperature of the second high-temperature coloring layer 19 closer to the photothermal conversion layer 20 gradually rises. However, the temperature becomes substantially equal to the temperature of the photothermal conversion layer 20.

On the other hand, heat is conducted from the photothermal conversion layer 20 to the second low temperature coloring layer 17 via the second high temperature coloring layer 19 and the intermediate layer 18, and as shown in FIG. 14, the temperature of the second low temperature coloring layer 17 gradually increases. By the time the temperature rises and the irradiation of the far-infrared laser light LFIR ends, the temperature of the second low temperature coloring layer 17 exceeds the third threshold temperature T3, and the second low temperature coloring layer 17 has magenta (M). It will develop color.

Next, the color development control of the second high temperature color development layer 19 will be described.
FIG. 15 is an explanatory diagram of the color development control temperature of the second high temperature temperature development layer.
Since it is necessary to generate heat in the photothermal conversion layer 20 also when the second high-temperature color-developing layer 19 is to be colored, the far-infrared laser light LFIR (wavelength λ2) is selected and the recording medium 10 is irradiated. Become.

Then, as shown in FIG. 15, the temperature of the photothermal conversion layer 20 does not exceed the third threshold temperature T3 corresponding to the second low temperature coloring layer 17, but exceeds the fourth threshold temperature T4 corresponding to the second high temperature coloring layer 19. The laser irradiation parameter value is set so as to irradiate the far-infrared laser light LFIR.

At this time, the far-infrared laser light LFIR that irradiates the photothermal conversion layer 20 rapidly increases the amount of heat generated and shortens the heat generation time as compared with the case where the second low-temperature color-developing layer 17 is colored. Is set.

Therefore, the photothermal conversion layer 20 absorbs the far-infrared laser light LFIR, performs light-heat conversion, and rapidly generates heat. Therefore, the temperature of the second high-temperature coloring layer 19 closer to the photothermal conversion layer 20 suddenly changes. The temperature rises and exceeds the fourth threshold temperature T4, and the second high-temperature coloring layer 19 develops yellow (Y).

On the other hand, heat is conducted from the photothermal conversion layer 20 to the second low temperature coloring layer 17 via the second high temperature coloring layer 19 and the intermediate layer 18, but as shown in FIG. 15, the time for heat conduction is short. Since the amount of heat (heat energy) transferred to the second low temperature coloring layer 17 is small, the temperature rise of the second low temperature coloring layer 17 is small, and the temperature of the second low temperature coloring layer 17 exceeds the third threshold temperature T3. There is no such thing, and the second low temperature coloring layer 17 does not develop color.

As described above, according to the first embodiment, even in the case of full-color recording, it is sufficient that two temperatures can be set as the effective color development threshold temperature, so that the color is developed at the lowest temperature. The threshold temperature for color development of the layer can be set high, and the effective heat resistance of the recording medium can be improved.
Further, as the laser recording device 30, it is only necessary to provide two laser oscillators as a laser light source, so that the cost of the device can be suppressed and the recording time at the time of full-color recording can be shortened.

[1.1] First Modified Example of First Embodiment Next, a first modified example of the first embodiment will be described.
FIG. 16 is a cross-sectional view of a configuration example of the recording medium of the first modification of the first embodiment.

In FIG. 16, the difference from the recording medium 10 of the first embodiment of FIG. 2 is that in the recording medium 10A, the first low temperature coloring layer 12, the intermediate layer 13, the first high temperature coloring layer 14 and the photothermal conversion layer 15 are provided. This is a point in which the photothermal conversion layer 15, the first high temperature coloring layer 14, the intermediate layer 13, and the first low temperature coloring layer 12 are laminated in this order on the base material 11. The intermediate layer 16 and subsequent layers are laminated in the same order as in the first embodiment.

In this case, the first high temperature coloring layer 14 that develops color at a higher temperature is arranged at a place closer to the photothermal conversion layer 15, and the first low temperature coloring layer 12 that develops color at a lower temperature is arranged at a place away from the photothermal conversion layer 15. Therefore, also in the first modification, it is possible to develop the color by the same procedure as in the first embodiment.

Therefore, also in the first modification, as in the first embodiment, when full-color recording is performed, the threshold temperature for color development of the color development layer that develops color at the lowest temperature can be set high, and the recording medium is effective. Heat resistance can be improved.

[1.2] Second Modified Example of First Embodiment Next, a second modified example of the first embodiment will be described.
FIG. 17 is a cross-sectional view of a configuration example of the recording medium of the second modification of the first embodiment.

In FIG. 17, the difference from the recording medium of the first embodiment of FIG. 2 is that the recording medium 10B is based on the first low temperature coloring layer 12, the intermediate layer 13, the first high temperature coloring layer 14, and the photothermal conversion layer 15. The point is that the first high temperature coloring layer 14, the photothermal conversion layer 15, the intermediate layer 13, and the first low temperature coloring layer 12 are laminated in this order on the material 11. The intermediate layer 16 and subsequent layers are laminated in the same order as in the first embodiment.

Also in this case, as in the first modification, the first high temperature coloring layer 14 that develops color at a higher temperature is arranged at a place closer to the photothermal conversion layer 15, and the place further away from the photothermal conversion layer 15 via the intermediate layer 13. Since the first low-temperature color-developing layer 12 that develops color at a low temperature is arranged, it is possible to perform color development in the same procedure as in the first embodiment in the second modification.

Therefore, also in the second modification, as in the first embodiment, when full-color recording is performed, the threshold temperature for color development of the color development layer that develops color at the lowest temperature can be set high, and the recording medium is effective. Heat resistance can be improved.

[1.3] Third Modified Example of the First Embodiment Next, a third modified example of the first embodiment will be described.
This third modification is a case where three colors are desired to be developed when a full-color image is formed.

FIG. 18 is a cross-sectional view of a configuration example of the recording medium of the third modification of the first embodiment.
In FIG. 18, the difference from the recording medium of the first embodiment of FIG. 2 is that the recording medium 10C includes a full-color recording layer 10CC and a monocolor (monochrome) recording layer 10CM, and a first low temperature. The point is that the coloring layer 12 and the intermediate layer 13 are not provided.

FIG. 19 is an explanatory diagram of a card-shaped recording medium in which the recording medium of the third modification is formed on a card substrate.
19 (a) is a cross-sectional view, and FIG. 19 (b) is a plan view.
As shown in FIG. 19B, the card-shaped recording medium 10X in which the recording medium 10C is formed on the card substrate BC is a full-color recording layer 10CC capable of recording full color (for example, YMC) when viewed from the surface side. It includes a formed full-color recording area ARC and a mono-color recording area ARM formed by a mono-color recording layer 10CM capable of recording character strings, mono-color images, and the like.

According to the above configuration, the recording speed of the monocolor recording area ARM can be significantly increased as compared with the case where the full color recording area ARM, that is, the full color recording layer 10CC is provided on the entire surface.

In this case, if the wavelength of the laser beam absorbed by the photothermal conversion layer 15 and causing heat generation and the recording wavelength of the monocolor recording layer 10CM constituting the monocolor recording region ARM are shared, the first high temperature is obtained. Recording to the color developing layer 14 and the monocolor recording layer 10CM can be continuously performed with a single irradiation.

In this case, as the monocolor recording layer 10CM, for example, carbon, copper, or the like is added as a coloring agent to a PC resin, a PVC resin, a PET resin, or the like, and a fiber laser, a YAG laser, a YVO ₄ laser, or the like is used. It can be used for general laser marking films that develop a black color.

[2] Second Embodiment Next, the laser recording apparatus of the second embodiment will be described.
FIG. 20 is a schematic block diagram of the laser recording apparatus of the second embodiment.
The laser recording apparatus 30A of the second embodiment includes a first laser oscillator 31 that outputs a near-infrared laser light LNIR (= wavelength λ1) and a first beam expander 32 that expands the beam diameter of the near-infrared laser light LNIR. And the first motor 38A that drives the first-direction scan mirror 37A that reflects the near-infrared laser light LNIR and drives the first-direction scan mirror 37A to scan the near-infrared laser light LNIR in the first direction. To drive the provided first-direction scanning unit 39A and the second-direction scan mirror 40A that reflects the near-infrared laser light LNIR, and to scan the near-infrared laser light LNIR in the second direction orthogonal to the first direction. A second-direction scanning unit 42A provided with a second motor 41A for driving the second-direction scanning mirror 40A, and a near-infrared laser beam LNIR guided via the first-direction scanning unit 39A and the second-direction scanning unit 42A. A condensing lens (F · θ lens) 43A that collects light on the recording medium 10 and a stage 44A that holds the recording medium 10 are provided.

Further, the laser recording device 30A includes a second laser oscillator 34 that outputs the far-infrared laser light LFIR (= wavelength λ2), a second beam expander 35 that expands the beam diameter of the far-infrared laser light LFIR, and red. A first-direction scanning unit 39B including a first motor 38B that drives a first-direction scan mirror 37B that reflects external laser light LFIR and drives a first-direction scan mirror 37B to scan far-infrared laser light LFIR. The second-direction scan mirror 40B that reflects the far-infrared laser light LFIR is driven, and the second-direction scan mirror 40B is driven to scan the far-infrared laser light LFIR in the second direction orthogonal to the first direction. The near-infrared laser light LNIR and the far-infrared laser light LFIR guided via the second-direction scanning unit 42B provided with the second motor 41B, the first-direction scanning unit 39B, and the second-direction scanning unit 42B are recorded. A condensing lens (F · θ lens) 43B that collects light on the medium 10 and a stage 44B that holds the recording medium 10 in a predetermined position are provided.

Further, the laser recording device 30A calculates the irradiation position and irradiation intensity of the far-infrared laser light LFIR and the near-infrared laser light LNIR based on the input input image data GD, and the calculation unit 45. The output control unit 46 that controls the laser output of the first laser oscillator 31 and the second laser oscillator 34 based on the result, and the first motors 38A and 38B and the second motors 41A and 41B based on the calculation result of the calculation unit 45. It is provided with an irradiation position control unit 47 that controls and controls the irradiation position of the near-infrared laser light LNIR and the far-infrared laser light LFIR on the recording medium 10.

Next, the recording process on the recording medium 10 in the laser recording apparatus 30A will be described.
FIG. 21 is an operation processing flowchart of the laser recording device of the second embodiment.
First, the recording medium 10 is carried into the stage 44A of the laser recording device 30A by a transfer device (not shown), detects whether or not the recording medium 10 has reached a predetermined position (step S22), and the recording medium 10 is placed at a predetermined position. When the above is reached, the recording medium 10 is fixed to the stage 44A (step S23).

Subsequently, when the input image data GD as RGB data is input (step S24), the calculation unit 45 of the laser recording device 30A analyzes the input image data GD and converts it into pixel-by-pixel color data (CMYK data). (Step S25).
Subsequently, the calculation unit 45 converts the color data into laser irradiation parameter values according to the combination of layers to be colored based on the color data for each pixel (step S26).

Here, specifically, the laser irradiation parameter values include a power setting value, a scanning speed setting value, a pulse width setting value, and an irradiation repeat number setting value for each of the far-infrared laser light LFIR and the near-infrared laser light LNIR. Scanning pitch set value, etc.

Subsequently, based on the laser irradiation parameter value set in step S26, image recording for causing the first low temperature coloring layer 12 and the first high temperature coloring layer 14 to develop colors using the near infrared laser beam LNIR is performed. (Step S27).

That is, when the first low-temperature color-developing layer 12 and the first high-temperature color-developing layer 14 are to be colored, the first laser oscillator 31 of the laser recording device 30 is driven, and the first laser oscillator 31 uses the near-infrared laser light LNIR ( = Wavelength λ1) is output to the first beam expander 32.
The first beam expander 32 expands the beam diameter of the near-infrared laser light LNIR and guides it to the first-direction scan mirror 37A of the first-direction scanning unit 39A.

The first-direction scan mirror 37A is driven by the first motor 38A and reflects the near-infrared laser light LNIR in the direction corresponding to the scanning position in the first direction (for example, the X direction), and the second-direction scan mirror 40A Lead to.

The second-direction scan mirror 40A is driven by the second motor 41 and reflects the near-infrared laser light LNIR in the direction corresponding to the scanning position in the second direction (for example, the Y direction orthogonal to the X direction) to collect the near-infrared laser light LNIR. Lead to the optical lens 43A.

As a result, the condenser lens 43A concentrates the near-infrared laser light LNIR toward a predetermined scanning position guided via the first-direction scanning unit 39 and the second-direction scanning unit 42, and the recording medium 10 The top is irradiated to record the first low-temperature color-developing layer 12 and the first high-temperature color-developing layer 14 of the recording medium 10.

When the recording on the first low temperature coloring layer 12 and the first high temperature coloring layer 14 is completed, the recording medium 10 is released from being fixed to the stage 44A (step S28), and the recording medium 10 is carried into the stage 44B by a transfer device (not shown). (Step S29), it is detected whether or not the recording medium 10 has reached the predetermined position (step S30), and when the recording medium 10 reaches the predetermined position, the recording medium 10 is fixed to the stage 44B (step). S31).

In this case, in order to prevent the image recording position from shifting, either physically prevent the position from shifting, or provide a recording position detecting device such as a camera that detects the recording position in step S27 to position the recording position. Try to align.

Then, based on the laser irradiation parameter value set in step S13, image recording for causing the second low temperature coloring layer 17 and the second high temperature coloring layer 19 to develop color is performed using the far infrared laser light LFIR. (Step S32).

That is, when the second low temperature coloring layer 17 and the second high temperature coloring layer 19 are to be colored, the second laser oscillator 34 is driven, and the second laser oscillator 34 uses the far-infrared laser light LFIR (= wavelength λ2). ) Is output to the second beam expander 35.
The second beam expander 35 expands the beam diameter of the far-infrared laser beam LFIR and guides it to the first-direction scan mirror 37B of the first-direction scanning unit 39B.

The first-direction scan mirror 37B is driven by the first motor 38B and reflects the far-infrared laser light LFIR in the direction corresponding to the scanning position in the first direction (for example, the X direction), and the second-direction scan mirror 40B Lead to.

The second-direction scan mirror 40B is driven by the second motor 41B and reflects the far-infrared laser light LFIR in the direction corresponding to the scanning position in the second direction (for example, the Y direction orthogonal to the X direction) to collect the far-infrared laser light LFIR. Lead to the optical lens 43B.

As a result, the condensing lens 43B condenses the far-infrared laser light LFIR toward a predetermined scanning position guided via the first-direction scanning unit 39B and the second-direction scanning unit 42B, and the condensing lens 43B condenses the far-infrared laser light LFIR toward the recording medium 10. The top is irradiated to record the second low-temperature color-developing layer 17 and the second high-temperature color-developing layer 19 of the recording medium 10.

When the recording on the second low temperature coloring layer 17 and the second high temperature coloring layer 19 is completed, the recording medium 10 is released from being fixed to the stage 44B (step S33), and the recording medium 10 is carried out from the stage 44B by a transfer device (not shown). And ends the recording process (step S34).

As described above, according to the second embodiment, the recording process on the first low temperature coloring layer 12 and the first high temperature coloring layer 14 and the recording processing on the second low temperature coloring layer 17 and the second high temperature coloring layer 19 The recording process can be performed in parallel, and the processing capacity can be nearly doubled as compared with the case of the first embodiment.

[3] Third Embodiment Next, the laser recording apparatus of the third embodiment will be described.
FIG. 22 is a schematic block diagram of the laser recording apparatus of the third embodiment.
The difference between the laser recording device 30B of the third embodiment and the laser recording device 30 of the first embodiment of FIG. 5 is that the first laser oscillator 31 outputs between the first beam expander 32 and the first mirror 33. A second laser oscillator is provided between a point provided with an output control unit 51 capable of attenuating while varying the output of the near-infrared laser light LNIR (= wavelength λ1), and between the second beam expander 35 and the second mirror 36. The output control unit 52 is provided so that the output of the far-infrared laser light LFIR (= wavelength λ2) output by 34 can be attenuated while being variable, and the output control unit 46 controls the output based on the calculation result of the calculation unit 45. The point is that the unit 51 and the output control unit 52 are controlled to control the corresponding laser output.

In the above configuration, the output control unit 51 and the output control unit 52 have an ND (Neutral Density) filter or a plurality of ND filters capable of steplessly reducing the amount of light by transmitting through positions having different thicknesses. , It is possible to use an ND filter unit that reduces the amount of light in multiple steps.

According to the above configuration, the laser output can be stabilized and more accurate color development control as compared with the case where the output control of the laser light is controlled by the power supply system of the first laser oscillator 31 or the second laser oscillator 34. Can be done. In particular, it is effective when the laser is used in a low output band of 30% or less of the rated output.

[4] Modifications of the Embodiment In the above description, the color development treatment of the first low temperature color development layer 12 and the first high temperature color development layer 14 and the color development treatment of the second low temperature color development layer 17 and the second high temperature color development layer 19 are defined. , However, if the thermal effect of the other color development process is taken into consideration when the color development process is performed in parallel, the process can be performed in parallel and the processing time is different. In comparison, it can be shortened to about 1/2.

Specifically, for example, when the first low-temperature coloring layer 12 and the first high-temperature coloring layer 14 are subjected to color development processing, the near-infrared laser light LNIR (= wavelength λ1) is absorbed by the photothermal conversion layer 20. Since heat is generated, the color development treatment of the second low temperature coloring layer 17 and the second high temperature coloring layer 19 may be performed in consideration of the amount of heat generated. Further, since it is conceivable that the temperature of the recording medium 10 itself rises due to the color development treatment of the second low temperature coloring layer 17 and the second high temperature coloring layer 19, the temperature rise is used for the first low temperature coloring layer 12 and the first high temperature coloring layer 12. It may be taken into consideration when the color development process of the layer 14 is performed.

In the above description, two color-developing layers (first low-temperature color-developing layer 12 and first high-temperature color-developing layer 14) having different color development threshold temperatures are arranged corresponding to the photothermal conversion layer 15 and correspond to the photothermal conversion layer 20. Therefore, two color-developing layers (second low-temperature color-developing layer 17 and second high-temperature color-developing layer 19) having different color threshold temperatures are arranged, but only one color-developing layer is supported for one of them. It is also possible to provide it.

Further, if at least one of the plurality of photothermal conversion layers is arranged so that two color-developing layers having different color development threshold temperatures are associated with each other, three photothermal conversion layers are provided. The same applies to the above cases.

In the above description, the case where the coloring layer has four layers and three layers has been described, but the same can be applied to the case where there are five or more layers.
For example, in the above description, the case of CMYK four-color recording has been described, but cyan (C), magenta (M), yellow (Y), red (R), green (G), blue (B), and black ( It can also be applied to the case of 7-color recording of CMYRGBK having a 7-color developing layer of K).

In the above description, the near-infrared laser light and the far-infrared laser light are used as the laser light, but the near-ultraviolet laser light and the far-ultraviolet laser light are configured to be used as the laser light depending on the absorption wavelength of the photothermal conversion layer. It is also possible to do.

In the above description, the calculation unit 45, the output control unit 46, and the irradiation position control unit 47 have been described as separate objects, but these are configured as a computer having an MPU, ROM, RAM, etc., and these functions are programmed. And it can also be configured to run through various interfaces.

In this case, the program executed by the computer is a file in an installable format or an executable format, and is a record that can be read by a computer such as a semiconductor recording device such as a CD-ROM, a DVD (Digital Versailles Disk), or a USB memory. It may be recorded on a medium and provided.

Further, the program executed by the computer may be stored on a computer connected to a network such as the Internet and provided by downloading the program via the network. Further, the program executed by the control unit 52 may be provided or distributed via a network such as the Internet.

Further, a program executed by a computer may be configured to be provided by incorporating it into a ROM or the like in advance.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

10, 10A, 10B, 10C Recording medium 10CC Full color recording layer 10CM Monocolor recording layer 10X Card-shaped recording medium 11 Base material 12 First low temperature coloring layer 13 Intermediate layer 14 First high temperature coloring layer 15 Photothermal conversion layer 16 Intermediate layer 17th 2 Low temperature color development layer 18 Intermediate layer 19 Second high temperature color development layer 20 Photothermal conversion layer 20A Photothermal conversion layer (functional layer)
20B photothermal conversion layer (protective layer)
30, 30A, 30B Laser recording device 31 1st laser oscillator 32 1st beam expander 33 1st mirror 34 2nd laser oscillator 35 2nd beam expander 36 2nd mirror 37, 37A, 37B 1st direction scan mirror 38, 38A, 38B 1st motor 39, 39A, 39B 1st direction scanning unit 40, 40A, 40B 2nd direction scan mirror 41, 41A, 41B 2nd motor 42, 42A, 42B 2nd direction scanning unit 43, 43A, 43B collection Optical lens 44, 44A, 44B Stage 45 Calculation unit 46 Output control unit 47 Irradiation position control unit 51 Output control unit 52 Output control unit 52 Control unit ARC Full color recording area ARG Image formation area ARI Specific information recording area ARM Monocolor recording area BC Card substrate GD Input image data LFIR Far-infrared laser light LNIR Near-infrared laser light T1 First threshold temperature T2 Second threshold temperature T3 Third threshold temperature T4 Fourth threshold temperature

Claims (10)

With the base material
A plurality of photothermal conversion layers that are laminated on the base material, arranged at positions separated from each other, and have different wavelengths of light used for photothermal conversion.
A color-developing layer that is laminated on the base material and that develops color by transferring heat from the photothermal conversion from any of the corresponding photothermal conversion layers.
In at least one of the plurality of photothermal conversion layers, two color-developing layers having different color-developing threshold temperatures and color-developing colors are arranged in association with each other.
recoding media. Of the two color-developing layers corresponding to the same photothermal conversion layer and having different threshold temperatures, one of the color-developing layers having a lower threshold temperature is located at a position farther from the corresponding photothermal conversion layer than the other color-developing layer. Laminated in,
The recording medium according to claim 1. The two color-developing layers corresponding to the same photothermal conversion layer and having different threshold temperatures are laminated via an intermediate layer having a heat insulating property.
The recording medium according to claim 2. A monochromatic color-developing layer that develops color when the light is incident is provided.
The recording medium according to any one of claims 1 to 3. The photothermal conversion layer absorbs either infrared light or ultraviolet light to perform the photothermal conversion.
The recording medium according to any one of claims 1 to 4. A plurality of photothermal conversion layers laminated on a base material and arranged at positions separated from each other and having different wavelengths of light used for photothermal conversion, and a plurality of photothermal conversion layers laminated on the base material and used for photothermal conversion. A recording device for recording on a recording medium including a color-developing layer in which heat from the photothermal conversion is transferred from one of the corresponding photothermal conversion layers to develop a color.
The two color-developing layers having different color-developing threshold temperatures and color-developing colors are associated with at least one of the plurality of photothermal conversion layers.
A plurality of light sources that output light used for the photothermal conversion that is absorbed by any of the corresponding photothermal conversion layers.
An optical system that guides light from the plurality of light sources to the recording medium, collects the light, and scans the light on the recording medium.
A control unit that controls the light source and the optical system based on the color-developing layer of the color-developing target corresponding to the input image data.
Recording device equipped with. The optical system includes a plurality of optical systems corresponding to the plurality of light sources.
The recording device according to claim 6. Each of the light paths output by the plurality of light sources is provided with a plurality of light amount reducing units that reduce the amount of the light and adjust the amount of incident light of the recording medium to the corresponding photothermal conversion layer. Yes,
The recording device according to claim 6 or 7. All of the light sources output either infrared light or ultraviolet light, and the wavelengths of the plurality of light sources are different from each other.
The recording device according to any one of claims 6 to 8. A plurality of light sources and an optical system for guiding and condensing light from the plurality of light sources to a recording medium and scanning the light on the recording medium are provided, and the light is laminated on a base material and located at positions separated from each other. A plurality of photothermal conversion layers having different wavelengths of light used for photothermal conversion and a plurality of photothermal conversion layers that are arranged and laminated on the base material, and one of the plurality of photothermal conversion layers corresponding to the photothermal conversion layer is used. It is a method executed by a recording device that records on a recording medium provided with a color-developing layer that develops color by transferring heat by photothermal conversion.
The two color-developing layers having different color-developing threshold temperatures and color-developing colors are associated with at least one of the plurality of photothermal conversion layers.
The process of converting to color data based on the input image data to be recorded,
The process of converting the color data into parameter values for light irradiation to irradiate the recording medium, and
A process of controlling the light source and the optical system based on the converted parameter values, performing photothermal conversion in the photothermal conversion layer corresponding to the color-developing layer to be colored, and controlling the color development of the color-developing layer.
Method with.

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