JP6786687B2 - Laser recording device - Google Patents

Description

Embodiments of the present invention relate to a laser recording device.

In the conventional laser recording method, when laser recording is performed directly on the recording medium, only monochromatic recording can be performed by utilizing the carbonization of the recording medium at the recording position (laser irradiation position) and the color change due to the reaction of the color former.

Also, a multicolored image is recorded by controlling the focusing position of laser light on a plastic object that is in the form of a film such as a transfer film or a laminated film, or a plastic object provided with such a film, and such a plastic object. A method to do so is also proposed.

Japanese Patent No. 4091423 Japanese Unexamined Patent Publication No. 2005-138558 Japanese Patent No. 3509246 Japanese Unexamined Patent Publication No. 2008-179131 Japanese Unexamined Patent Publication No. 2010-131878 Japanese Unexamined Patent Publication No. 2004-25739

However, in the prior art, it is necessary to have a plurality of laser light source devices having different wavelengths and a plurality of ultraviolet light irradiation devices for stopping color development, so that it is difficult to reduce the device cost and downsize the device. It was. Further, when the focusing position of the laser is changed according to the color-developing layer, the quality of the recorded image may be easily deteriorated due to variations in the recording medium such as distortion, unevenness, optical system, and thickness of the color-developing layer. ..

The present invention has been made in view of the above, and in a laser recording device that scans a laser beam to record an image, a laser capable of simplifying the device configuration while maintaining and improving the quality of the recorded image. The purpose is to provide a recording device.

The laser recording apparatus of the embodiment includes heat-sensitive materials having different color development threshold temperatures, and the laser light is emitted so that the threshold temperature of the heat-sensitive material contained through the intermediate layer that performs heat insulation and heat transfer becomes high. This is a laser recording device that records by irradiating a recording medium provided with a plurality of heat-sensitive recording layers laminated from the surface side to be irradiated with the laser beam.
Then, the control unit of the laser recording device increases the power density of the laser beam relatively higher when recording the heat-sensitive recording layer having a higher threshold temperature, and is more effective when recording the heat-sensitive recording layer having a lower threshold temperature. When the laser beam is irradiated to record the heat-sensitive recording layer to be recorded and the same recording position is recorded by irradiating the laser beam multiple times at the same recording position, a plurality of recording areas are provided. It is divided into the sub-recording areas of the above, and the irradiation cycle of the laser light in each of the sub-recording areas of the same heat-sensitive recording layer is controlled to be the same.

FIG. 1 is a schematic configuration explanatory view of a recording medium used in the embodiment. FIG. 2 is an explanatory diagram of a color development principle in monochromatic color development of the embodiment. FIG. 3 is an explanatory diagram of an example of laser irradiation conditions. FIG. 4 is a schematic block diagram of the laser recording device of the embodiment. FIG. 5 is an image diagram of laser irradiation seen from a cross section perpendicular to the stacking direction of each layer of the recording medium. FIG. 6 is an image diagram of irradiation of the laser beam LB as seen from the incident direction of the laser beam LB. FIG. 7 is an explanatory diagram of the correspondence between the image of laser irradiation viewed from a cross section perpendicular to the stacking direction of each layer of the recording medium and the image of irradiation of laser light LB viewed from the incident direction of laser light LB. .. FIG. 8 is an explanatory diagram of the correspondence between the image of laser irradiation viewed from a cross section perpendicular to the stacking direction of each layer of the recording medium and the image of irradiation of laser light LB viewed from the incident direction of laser light LB. .. FIG. 9 is an explanatory diagram of pixel numbering constituting an image corresponding to the input image data. FIG. 10 is a processing flowchart for shortening the total recording time in laser recording. FIG. 11 is an explanatory diagram for determining a sub-recording area in the second modification. FIG. 12 is a detailed processing flowchart of the calculation processing of a plurality of regions that can be recorded with the period Ttem in the second modification. FIG. 13 is an explanatory diagram of the effect of the second modification. FIG. 14 is a detailed processing flowchart of the calculation processing of a plurality of regions that can be recorded in the periodic Ttem in the third modification. FIG. 15 is an explanatory diagram for determining a sub-recording area in the third modification. FIG. 16 is an explanatory diagram of the effect of the fourth modification. FIG. 17 is an explanatory diagram of the fifth modification. FIG. 18 is an explanatory diagram of a color development principle in the plurality of colors of the fourth embodiment. FIG. 19 is an explanatory diagram of an energy-time relationship in which each color-developing layer in the fourth embodiment exceeds a threshold temperature for color development. FIG. 20 is an explanatory diagram of an example of laser irradiation conditions. FIG. 21 is an explanatory diagram of a specific configuration example of the recording medium. FIG. 22 is an explanatory diagram of a color development method by mixing a plurality of colors according to the first aspect. FIG. 23 is an explanatory diagram of a color development method using a single color. FIG. 24 is an operation flowchart of the first aspect of the fourth embodiment. FIG. 25 is a flowchart of the conversion process to CMYRBK data. FIG. 26 is an operation flowchart of a modified example of the first aspect of the fourth embodiment. FIG. 27 is an operation flowchart of the second aspect of the fourth embodiment. FIG. 28 is a flowchart of the conversion process to CMYRBK data. FIG. 29 is a schematic configuration explanatory view of the recording medium used in the fifth embodiment. FIG. 30 is an explanatory diagram of the recording control of the sixth embodiment. FIG. 31 is an operation flowchart of the sixth embodiment. FIG. 32 is a flowchart of the conversion process to CMYRGBK data. FIG. 33 is an operation flowchart of the first aspect of the fourth embodiment. FIG. 34 is an operation flowchart of the second aspect of the sixth embodiment. FIG. 35 is a flowchart of the conversion process to CMYRGBK data.

Hereinafter, embodiments will be described in detail with reference to the drawings.
[1] First Embodiment First, the principle of the first embodiment will be described.
In the laser recording method of the first embodiment, the heat generated on at least the protective layer 18 by the laser irradiation is conducted to each layer and the temperature of each layer is changed depending on the method of applying the heat by the laser, that is, the laser irradiation condition. This is a recording method in which each layer is selectively colored by control.

FIG. 1 is a schematic configuration explanatory view of a recording medium used in the embodiment.
As shown in FIG. 1, the recording medium 10 has a low temperature coloring layer 13, a first spacer layer 14, a medium temperature coloring layer 15, a second spacer layer 16, a high temperature coloring layer 17, and a protective layer 18 on the base material 12. They are stacked in order. Here, the low-temperature coloring layer 13, the medium-temperature coloring layer 15, and the high-temperature coloring layer 17 constitute a heat-sensitive recording layer (low-temperature heat-sensitive recording layer, medium-temperature heat-sensitive recording layer, high-temperature heat-sensitive recording layer) on which image recording is performed, and the first spacer. The layer 14 and the second spacer layer 16 form an intermediate layer for heat insulation and heat transfer.

In the above configuration, the base material 12 includes a low temperature coloring layer 13, a first spacer layer 14, and a medium temperature coloring layer 1.
5. Holds the second spacer layer 16, the high temperature coloring layer 17, and the protective layer 18.
The low temperature coloring layer 13 is a layer containing a temperature indicating material as a heat sensitive material that develops color when the temperature becomes equal to or higher than the first threshold temperature Tl.

The first spacer layer 14 provides a thermal barrier when the low temperature coloring layer 13 is not colored, and the low temperature coloring layer 13 provides a thermal barrier.
It is a layer that suppresses heat transfer from the medium temperature coloring layer 15 side.
The medium-temperature coloring layer 15 is a layer containing a temperature-indicating material as a heat-sensitive material that develops color when the temperature becomes equal to or higher than the second threshold temperature Tm (> Tl).

The second spacer layer 16 provides a thermal barrier when the medium temperature coloring layer 15 is not colored, and the medium temperature coloring layer 15 provides a thermal barrier.
It is a layer that suppresses heat transfer from the high temperature coloring layer 17 side.
The high-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 Th (> Tm) or higher.

The protective layer 18 is a layer for protecting the low temperature coloring layer 13, the first spacer layer 14, the medium temperature coloring layer 15, the second spacer layer 16, and the high temperature coloring layer 17.

FIG. 2 is an explanatory diagram of a color development principle in monochromatic color development of the embodiment.
FIG. 2A is an explanatory diagram of the principle when the low temperature coloring layer 13 is individually colored.
Further, FIG. 2B is an explanatory diagram of the principle when the medium temperature coloring layer 15 is individually colored.
Further, FIG. 2C is an explanatory diagram of the principle when the high temperature coloring layer 17 is individually colored.

When only the low temperature coloring layer 13 is colored, heat is transferred from the laser irradiation position and the low temperature coloring layer 1 is developed.
It is necessary to transfer heat up to 3, but at the same time, recording is performed under laser irradiation conditions in which the temperature of the medium temperature coloring layer 15 does not exceed the second threshold temperature Tm and the temperature of the high temperature coloring layer 17 does not exceed the third threshold temperature Th. Do.
As a result, as shown in FIG. 2A, the color is developed in the coloring region 21 of the low temperature coloring layer 13.

Further, when only the medium temperature coloring layer 15 is to be colored, heat must be transferred from the laser irradiation position to the medium temperature coloring layer 15, but at the same time, the temperature of the high temperature coloring layer 17 is the third threshold temperature Th.
The heat transfer is suppressed by the spacer layer 14, and the recording is performed under the laser irradiation condition in which the temperature of the low temperature coloring layer 13 does not exceed the first threshold temperature Tl.
As a result, as shown in FIG. 2B, color is developed in the color development region 22 of the medium temperature color development layer 15.

Further, when only the high temperature coloring layer 17 is to be colored, heat must be transferred from the laser irradiation position to the high temperature coloring layer 17, but at the same time, the spacer layer 16 and the spacer layer 14 suppress the heat transfer. Recording is performed under laser irradiation conditions in which the temperature of the medium temperature coloring layer 15 does not exceed the second threshold temperature Tm and the temperature of the low temperature coloring layer 13 does not exceed the first threshold temperature Tl.
As a result, as shown in FIG. 2C, color is developed in the color development region 23 of the high temperature color development layer 17.

FIG. 3 is an explanatory diagram of an example of laser irradiation conditions.
As shown in FIG. 3, the power densities and recording times of the laser light for coloring each of the low temperature coloring layer 13, the medium temperature coloring layer 15, and the high temperature coloring layer 17 are set to the power densities PDl and PDm, respectively.
, PDh and recording time th, tm, tl
PDl <PDm <PDh and th <tm <tl
Set to meet the conditions of.

In other words, when it comes to power density,
PDl + α1 = PDm + α2 = PDh (α1>α2> 0)
And. In this case, the values of α1 and α2 shall be appropriately set in advance according to the materials constituting the low temperature coloring layer 13, the medium temperature coloring layer 15, and the high temperature coloring layer 17.

Also, regarding the recording time
th + β1 = tm + β2 = tl (β1>β2> 0)
And. In this case, the values of β1 and β2 shall be appropriately set in advance according to the materials constituting the low temperature coloring layer 13, the medium temperature coloring layer 15, and the high temperature coloring layer 17.

That is, in order to selectively develop the color of the low temperature coloring layer 13, the power density PDl is relatively the smallest and the recording time tl is relatively the largest.
By irradiating the laser beam under such conditions, the temperature of the medium temperature coloring layer 15 does not exceed the second threshold temperature Tm and the high temperature coloring layer 15 is transferred to the high temperature coloring layer 17 and the medium temperature coloring layer 15. The temperature of the low temperature coloring layer 13 can be made to exceed the first threshold temperature Tl while the temperature of 17 does not exceed the third threshold temperature Th.

Further, in order to selectively develop the color of the high temperature coloring layer 17, the power density PDh is relatively the largest and the recording time th is relatively the shortest. By irradiating the laser beam under such conditions, the medium temperature coloring layer 15 is at the stage where heat is transferred to the medium temperature coloring layer 15 and the low temperature coloring layer 13.
Only the high temperature coloring layer 17 can exceed the threshold temperature without exceeding the threshold temperature of the above and the threshold temperature of the low temperature coloring layer 13.

Further, in order to selectively develop the color of only the medium temperature coloring layer 15, the power density PDm and the recording time tm are set to relatively intermediate values as described above.

By irradiating the laser under such conditions, the high temperature coloring layer 17 and the low temperature coloring layer 13
At the stage where heat is transferred to, only the medium temperature coloring layer 15 can exceed the threshold temperature without exceeding the threshold temperature of the high temperature coloring layer 17 and the threshold temperature of the low temperature coloring layer 13.

As described above, since each layer corresponding to the three primary colors can be selectively developed, full-color recording in which the three primary colors are combined becomes possible. Further, according to the method of the present embodiment
Since the three primary colors can be superimposed and recorded in the stacking direction of each layer of the recording medium, it is possible to provide a good-looking image even at a relatively low resolution as compared with the case where the three primary colors are arranged separately along a two-dimensional plane.

A more detailed embodiment will be described below.
FIG. 4 is a schematic block diagram of the laser recording device of the embodiment.
The laser recording device 100 effectively emits the laser head unit 102 that emits the laser light LB for recording to the recording medium 10 placed on the recording stage 101 and the laser light LB emitted by the laser head unit 102. Drive unit 1 for driving the recording stage 101 for scanning
It includes 03 and a control unit 104 configured as a microcomputer that controls a laser head unit 102 and a drive unit 103 based on recorded image data input from the outside.

In the above configuration, the laser head unit 102 uses the laser light LB under the control of the control unit 104.
Spot control unit 10 as an optical system that controls the focal position of the laser beam and the spot diameter of the laser beam LB.
It has 2A.

Further, the control unit 104 uses the laser head unit 10 based on a control program stored in advance.
The power density, irradiation time, focal position, spot diameter, etc. of the laser beam LB emitted from 2 are controlled.

First, the scanning speed of the laser is changed for each color to be developed on the recording medium 10 in which three color-developing layers each having different threshold temperatures Tl, Tm, and Th corresponding to one of the three primary colors are laminated. The method of controlling the recording time of each color and selectively developing the three primary colors will be described.

In the first embodiment, the scanning speed of the laser beam LB is controlled as a parameter for controlling the recording time. That is, the recording time is controlled to be relatively long by relatively slowing the scanning speed of the laser beam LB.

FIG. 5 is an image diagram of laser irradiation seen from a cross section perpendicular to the stacking direction of each layer of the recording medium.
Further, FIG. 6 is an image diagram of irradiation of the laser beam LB as seen from the incident direction of the laser beam LB.
In FIG. 6, the position of the spot SPT of the laser beam LB for each unit time is schematically shown.

5 (a) and 6 (a) show the laser beam LB when the low temperature coloring layer 13 is selectively colored.
When only the low temperature coloring layer 13 is to be colored, for example, the power density PDl = 0.01 to 15.0 [W / cm ² ] is set, and the scanning speed V1 = 1. 0-
The laser is scanned at a speed of 90 [mm / s].

Here, the power density PDl is set in the above range because the power density PDl <0.01 [W.
If it is [/ cm ² ], the temperature may not rise to the first threshold temperature Tl, which is the threshold temperature of the low temperature coloring layer 13, and if the power density PDl> 15.0 [W / cm ² ], the temperature This is because there is a possibility that the medium temperature coloring layer 15 and the high temperature coloring layer 17 will develop color at the same time.

Further, when the scanning speed V1 <1.0 [mm / s], the energy applied to the same portion is too large, so that the temperature rises too much and the medium temperature coloring layer 15 and the high temperature coloring layer 17 may develop colors at the same time. When the scanning speed is V1> 90 [mm / s], the threshold temperature of the low temperature coloring layer 13 (
This is because the temperature may not rise to the first threshold temperature Tl).

Further, FIGS. 5 (b) and 6 (b) show the power density and scanning speed of the laser when the medium-temperature coloring layer 15 is selectively colored, and when only the medium-temperature coloring layer 15 is colored, the laser power density and the scanning speed are shown. For example, the power density is PDm = 1.0 to 100.0 [W / cm ² ], and the scanning speed is V2 = 10 to 5.
The laser is scanned at a speed of 00 [mm / s].

Here, the power density PDm is set in the above range because the power density PDm <1.0 [W /
If it is cm ² ], the temperature may not rise to the second threshold temperature Tm, which is the threshold temperature of the medium temperature coloring layer 15, and if the power density PDm> 100.0 [W / cm ² ], the temperature is high. This is because the temperature may rise too much and the high temperature coloring layer 17 may develop color, and the temperature transmitted to the low temperature coloring layer 13 may also exceed the threshold temperature (first threshold temperature Tl) to develop color.

Further, when the scanning speed V2 <10 [mm / s], the energy applied to the same location is too large, so that the temperature may rise too much and the high temperature coloring layer 17 may develop color, and the low temperature coloring layer 13 may develop color. There is a possibility that the temperature transmitted to the above will also exceed the threshold temperature (first threshold temperature Tl) to develop color, and when the scanning speed V2> 500 [mm / s], the second threshold temperature of the medium temperature coloring layer 15 This is because the temperature may not rise to the threshold temperature Tm.

Further, FIGS. 5 (c) and 6 (c) show the scanning speed and power density of the laser beam LB when the high-temperature coloring layer 17 is selectively colored, and when only the high-temperature coloring layer 17 is colored. To
For example, the power density PDh = 150 to 1000 [W / cm ² ], and the scanning speed V3 = 75.
The laser is scanned at a speed of 0-6000 [mm / s].

Here, the power density PDh is set in the above range because the power density PDh <150 [W /
If it is cm ² ], the temperature may not rise to the threshold temperature of the high temperature coloring layer 17, and if the power density PDh> 1000 [W / cm ² ], the temperature rises too much and the protection on the surface layer is present. There is a possibility that the layer 18 is thermally destroyed, and the heat generated on the surface layer is too large, so that the temperature of these layers becomes the threshold temperature (when it is transmitted to the medium temperature coloring layer 15 and the low temperature coloring layer 13).
This is because there is a possibility that the color may be developed at the same time when the first threshold temperature Tl or the second threshold temperature Tm) is exceeded.

Further, if the scanning speed is V3 <750 [mm / s], the energy applied to the same location is too large, so that the temperature rises too much and the protective layer 18 on the surface layer may be thermally destroyed. When the heat generated in the surface layer is too large and is transmitted to the medium temperature coloring layer 15 and the low temperature coloring layer 13, the temperature of these layers becomes the threshold temperature (first threshold temperature Tl or second threshold temperature T).
There is a possibility that the color will be developed at the same time exceeding m), and if the scanning speed V3> 6000 [mm / s], the temperature may not rise to the third threshold temperature Th, which is the threshold temperature of the high temperature coloring layer 17. Because.

These power densities and scanning speeds largely depend on the absorption rate when the energy of the laser beam is absorbed by the surface layer. In the above example, a protective layer whose surface layer is a material having an absorption rate of about 1% to 50%. This is an example used for.

In the above configuration, it is desirable to use the following materials as the recording medium.
For example, as the base material 12, polyester resin, polyethylene terephthalate (PET),
Glycol-modified polyester (PET-G), polypropylene (PP), polycarbonate (PC), polyvinyl chloride (PVC), styrene-butadiene copolymer (SBR), polyacrylic resin, polyurethane resin, polystyrene resin, etc. Processed into film or plate Use a resin that can be used.

Further, as a filler for the resin used for the recording medium, it is possible to use a resin such as silica, titanium oxide, calcium carbonate, and alumina in which whiteness, surface smoothness, heat insulating property, etc. are added to the base material.

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

The low-temperature coloring layer 13, the medium-temperature coloring layer 15, and the high-temperature coloring layer 17 are, for example, polyvinyl alcohol.
Highly transparent resins such as polyvinyl acetate and polyacrylic are used as binders, and leuco dyes, leuco dyes and other temperature-indicating materials are used as coloring materials that develop three primary colors when a certain threshold temperature is exceeded.

Leuco dye as a coloring material, leuco dye, and other temperature-indicating materials include 3,3-bis (1).
-N-Butyl-2-methyl-indole-3-yl) Phthalide, 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-toluidino) -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- Coloring dyes such as chloroanilinofluorane, rhodamine B lactam, 3-methylspirodinaphthopyran, 3-ethylspirinaftopyran, and 3-benzylspironaftpyran can be mentioned.

Further, as the color developer, any acidic substance used as an electron acceptor in the heat-sensitive recorder can be used. For example, an inorganic substance such as active white clay or acidic white clay, an inorganic acid, an aromatic carboxylic acid, an anhydride thereof, or Examples thereof include metal salts, organic sulfonic acids, other organic acids, and organic color-developing agents such as phenolic compounds, and phenolic acid is particularly preferable.

More specific examples of the color developer include bis3-allyl-4-hydroxyphenylsulfone, polyhydroxystyrene, zinc salt of 3,5-di-t-butylsalicylic acid, and 3-octyl-5-methylsalicylic acid. Zinc salt, 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'-ethylenebis (2-methylphenol), 4,4'-thiobis (6-t-butyl-3-methylphenol), 1,1-bis (4-hydroxyphenyl) -cyclohexane , 2,2'-bis (4-hydroxyphenyl) -n-heptane,
Phenolic compounds such as 4,4'-cyclohexylidenebis (2-isopropylphenol), 4,4'-sulfonyldiphenol, salts of the phenolic compounds, salicylic acid anilide, novolak type phenolic resin, p-hydroxybenzoic acid Examples include benzyl.

Further, the spacer layers 14 and 16 provided between the layers of each color developing layer are made of polypropylene (PP).
Polyvinyl alcohol (PVA), styrene-butadiene copolymer (SBR), polystyrene, polyacrylic and the like can be used.

On the other hand, the laser to be used is preferably a red to infrared light laser having a strong thermal action, and a wavelength band of 800 to 15000 nm is preferable. YA used especially for thermal processing
G laser, YVO ₄ laser, CO ₂ laser, semiconductor laser and the like are preferable.

The wavelength band of the laser light LB is set to 800 to 15000 nm because when the wavelength band of the laser light LB is less than 800 nm, a special layer that absorbs light and converts it into heat in order to obtain heat for color development is formed as a surface layer. This is because it is necessary to use another color former that causes color development by light energy instead of heat.

Further, when the wavelength band of the laser light LB exceeds 15,000 nm, the beam waist at the focusing point is not sufficiently small when the laser light is focused by a lens or the like, and the size of the pixels that can be recorded cannot be reduced. This is because it becomes difficult to record a high-resolution image.

As described above, according to the first embodiment, the recording time of each color can be controlled by changing the scanning speed of the laser for each color to be developed, and the three primary colors can be selectively developed. The device configuration can be simplified while maintaining and improving the quality of the recorded image.

[2] Second Embodiment In the first embodiment, the method of controlling the recording time of each color by changing the scanning speed of the laser for each color to be developed and selectively developing the three primary colors has been described. , Book 2nd
The embodiment is an embodiment in which the laser scanning speed is kept constant and the recording time is controlled by the number of scannings instead of changing the laser scanning speed.

FIG. 7 is an explanatory diagram of the correspondence between the image of laser irradiation viewed from a cross section perpendicular to the stacking direction of each layer of the recording medium and the image of irradiation of laser light LB viewed from the incident direction of laser light LB. ..

In the second embodiment, in order to control the recording time for selectively developing the three primary colors, the scanning speed of the laser beam LB is set to a constant value of, for example, 10 to 6000 [mm / s], and irradiation is repeated. The recording time is controlled by the number of times (scanning number).

FIG. 7A shows the power density and the number of scans when the low temperature coloring layer 13 is selectively colored, and when the low temperature coloring layer 13 is colored, for example, 0.01 to 15.0 [W]. / Cm ² ]
Scan repeatedly 3 to 50 times at the same location with the power density of.
In FIG. 7, in order to facilitate understanding of the difference in the number of scans, the position of the laser spot SPT (laser irradiation position) when viewed from the incident direction of the laser is shifted up and down, but it is actually the same. The laser is repeatedly radiated to the position repeatedly.

Here, the power density PDl is set in the above range because the power density PDl <0.01 [W.
If it is [/ cm ² ], the temperature may not rise to the threshold temperature (first threshold temperature Tl) of the low temperature coloring layer 13, and if the power density PDl> 15.0 [W / cm ² ], the temperature This is because there is a possibility that the medium temperature coloring layer 15 and the high temperature coloring layer 17 will develop color at the same time.

Further, the number of scans CT1 corresponding to the low-temperature color-developing layer 13 is set in the above range by the number of scans CT.
If 1 <3 [times], the temperature may not rise to the threshold temperature (first threshold temperature Tl) of the low-temperature coloring layer 13, and if the number of scans CT1> 50 [times], the same location is added. This is because the energy is too large, so that the temperature rises too much, and the medium temperature coloring layer 15 and the high temperature coloring layer 17 may develop colors at the same time.

Further, FIG. 7B shows the power density and the number of scans of the laser beam LB when the medium temperature coloring layer 15 is selectively colored. When only the medium temperature coloring layer 15 is colored, for example, 1. 0-
The same location is repeatedly scanned 1 to 30 times with a power density of 100.0 [W / cm ² ].

Here, the power density PDm is set in the above range because the power density PDm <1.0 [W /
When it is [cm ² ], the temperature may not rise to the threshold temperature (second threshold temperature Tm) of the medium temperature coloring layer 15, and when the power density PDm> 100.0 [W / cm ² ], the temperature is high. This is because the temperature may rise too much and the high temperature coloring layer 17 may develop color, and the temperature transmitted to the low temperature coloring layer 13 may also exceed the threshold value to develop color.

Further, the number of scans CT2 corresponding to the medium-temperature color-developing layer 15 is set in the above range by the number of scans CT.
This is because when 2 <1 [times], the temperature does not rise to the threshold temperature (second threshold temperature Tm) of the medium temperature coloring layer 15, and when the number of scans CT2> 30 [times], the energy applied to the same location is applied. Is too large, the temperature may rise too much, and the high temperature coloring layer 17 may develop color, and the temperature transmitted to the low temperature coloring layer 13 may also exceed the threshold temperature (first threshold temperature Tl). Because there is sex.

Further, FIG. 7C shows the power density and the number of scans of the laser when the high-temperature coloring layer 17 is selectively colored, and when only the high-temperature coloring layer 17 is colored, for example, 150 to 100
The same location is repeatedly scanned 1 to 10 times with a power density of 0 [W / cm ² ].

Here, the power density PDh is set in the above range because the power density PDh <150 [W /
If it is cm ² ], the temperature may not rise to the threshold temperature of the high temperature coloring layer 17, and if the power density PDh> 1000 [W / cm ² ], the temperature rises too much and the protection on the surface layer is present. There is a possibility that the layer 18 is thermally destroyed, and the heat generated on the surface layer is too large, so that the temperature of these layers becomes the threshold temperature (first) when it is transmitted to the low temperature coloring layer 13 or the medium temperature coloring layer 15. This is because there is a possibility that the color may be developed at the same time when the threshold temperature Tl or the second threshold temperature Tm) is exceeded.

Further, the number of scans CT3 corresponding to the high-temperature color-developing layer 17 is set in the above range by the number of scans CT.
This is because when 3 <1 [times], the temperature does not rise to the threshold temperature (third threshold temperature Th) of the high-temperature coloring layer 17, and when the number of scans CT3> 10 [times], the energy applied to the same location is applied. Is too large, the temperature may rise too much and the protective layer 18 on the surface layer may be thermally destroyed, and the heat generated on the surface layer is too large, so that the medium temperature coloring layer 15 and the low temperature coloring layer 13 may be thermally destroyed. This is because the temperature of these layers may exceed the threshold temperature (second threshold temperature Tm or first threshold temperature Tl) and simultaneously develop color when the temperature is transmitted to.
Other configurations and operations are the same as those in the first embodiment.

As described above, according to the second embodiment, the recording time of each color can be controlled by changing the number of times the laser is scanned for each color to be developed, and the three primary colors can be selectively developed. The device configuration can be simplified while maintaining and improving the quality of the recorded image.

[3] Third Embodiment In the first embodiment, a method of controlling the recording time of each color by changing the scanning speed of the laser for each color to be developed and selectively developing the three primary colors has been described. , Book 3rd
The embodiment is an embodiment in which the laser scanning speed is kept constant and the recording time is controlled by the waiting time (scanning standby time) at the time of scanning instead of changing the laser scanning speed.

FIG. 8 is an explanatory diagram of the correspondence between the image of laser irradiation viewed from a cross section perpendicular to the stacking direction of each layer of the recording medium and the image of irradiation of laser light LB viewed from the incident direction of laser light LB. ..

As shown in FIG. 8, in the third embodiment, in order to selectively develop the three primary colors, for example, the power density is set to a constant value of 1 to 20000 [W / cm ² ], and the scanning speed is set to 10 to 60.
A constant value of 00 [mm / s], a constant number of scans of 1 to 50, and a waiting time (scanning standby time) from the nth scan to the n + 1th scan when repeating laser scanning. Is controlled by.

FIG. 8A schematically shows the power density, the scanning speed, and the number of scans when the low temperature coloring layer 13 is selectively colored. When the low temperature coloring layer 13 is colored, for example, the waiting time is shown. WT1 is set from 100 to 100,000 [μs], and the above power density, scanning speed,
The same location is repeatedly scanned according to the number of scans.

Here, the waiting time WT1 is set in the above range because the waiting time WT is set.
When 1 <100 [μs], the temperature rises too much and the medium temperature coloring layer 15 and the high temperature coloring layer 17 may develop colors at the same time. When the waiting time WT1> 100000 [μs], the low temperature coloring layer This is because the temperature of 13 may not rise to the threshold temperature.

Further, FIG. 8B schematically shows the power density, scanning speed, and number of scans of the laser beam LB when the medium-temperature color-developing layer 15 is selectively colored, and when only the medium-temperature color-developing layer 15 is colored. For example, the waiting time WT2 is set to 10 to 10000 [μs], and the same location is repeatedly scanned with the above power density, scanning speed, and number of scans.

Here, the waiting time WT2 is set in the above range because the waiting time WT is set.
If 1 <10 [μs], the temperature may rise too much and the high temperature coloring layer 17 may develop color, and the temperature transmitted to the low temperature coloring layer 13 may also exceed the threshold value to develop color. This is because if the waiting time WT2> 10000 [μs], the temperature of the medium temperature coloring layer 15 may not rise to the threshold temperature.

Further, FIG. 8C schematically shows the power density, scanning speed, and number of scans of the laser when the high temperature coloring layer 17 is selectively colored, and when only the medium temperature coloring layer 15 is colored, FIG. For example, the waiting time WT3 is set to 0.1 to 5000 [μs], and the above power density is set.
The same location is repeatedly scanned at the scanning speed and the number of scans.

Here, the waiting time WT3 is set in the above range because the waiting time WT
If 1 <0.1 [μs], the temperature may rise too much and the protective layer 18 on the surface layer may be thermally destroyed, and the heat that can be generated on the surface layer is too large, resulting in medium temperature color development. Layer 15
When the temperature of these layers exceeds the threshold temperature and the color is simultaneously developed when the temperature is transmitted to the low temperature coloring layer 13, the temperature of the high temperature coloring layer 17 is the threshold when the waiting time WT3> 5000 [μs]. This is because it may not rise to the temperature.
Other configurations and operations are the same as those in the first embodiment.

As described above, according to the third embodiment, the recording time of each color is controlled by changing the waiting time at the time of irradiation of the laser beam LB for each color to be developed, and the three primary colors are selectively developed. Therefore, the device configuration can be simplified while maintaining and improving the quality of the recorded image.

[4] Modifications of the first to third embodiments [4.1] First modification In each of the above embodiments, the scanning speed of the laser beam LB, the number of scans of the laser beam LB (number of small company floors), or Although the waiting time was controlled individually, it is also possible to configure the waiting time to be controlled in combination.

[4.2] Second Modified Example In the above description, the image is recorded for each recording dot, but in the second modified example, a plurality of recording dots (pixels) are recorded within a certain recording time. This is a modified example in which the total recording time until the end of the image recording process on the recording medium 10 is shortened by adopting the configuration of recording in.

That is, in the second modification, the heat applied on the surface is applied to the lower layer (high temperature coloring layer 17 → medium temperature coloring layer 15 →) by utilizing the time lag from the irradiation of the laser beam LB to the transfer of heat to each coloring layer.
The total recording time is shortened by simultaneously proceeding with the recording of other recording dots (pixels) while being transmitted to the low temperature coloring layer 13).

In this second modification, in order to stably raise the temperature to the threshold of color development at each recording dot, the same spot is irradiated with the laser beam LB once or a plurality of times at a constant cycle.
By the way, since there are irradiation conditions of the laser light LB suitable for developing each color, when the laser light LB is irradiated a plurality of times, there is an optimum period in the second and subsequent irradiations.

Therefore, in the second modification, the recording area corresponding to the desired recorded image is divided into a plurality of sub-recording areas that can be recorded at the optimum cycle in the second and subsequent irradiations, and the recording of each sub-recording area is completed. After that, the process moves to the recording of the next sub-recording area, and the recordings are combined to finally obtain the desired image.
In the following description, a certain coloring layer (in this embodiment, the low temperature coloring layer 13 and the medium temperature coloring layer 1)
As an irradiation condition for selectively coloring 5 and the high-temperature coloring layer 17),
-Laser scanning speed at recording pixels: Vtem
-Laser scanning speed with non-recording pixels: Ve
-Pitch in the sub-scanning direction: d
-Time cycle when repeatedly irradiating a certain pixel at the same location: Ttem
And.

In addition, information such as pixels of the recorded image is specified as follows.
-Width of the recorded image in the scanning direction (width of the recording area in the scanning direction): w
-Width in the sub-scanning (height) direction of the recorded image (width in the sub-scanning direction of the recording area): H
・ Width of one side of one pixel: R
-Number of pixels in the scanning direction of the recorded image: w / R
-Number of pixels in the secondary scanning direction of the recorded image: H / R
· N pixels of the recording pixel data: _{I n}
-Position data of the nth pixel: P _n
-Recording time in the unit recording area when recording up to the nth pixel: t _n
・ Area number that can be recorded with T: X
_-Position of end pixel of area X: P _fX
-Position of start pixel of area X: P _sX
・_Distance from P _sX to P _n : D _n

FIG. 9 is an explanatory diagram of pixel numbering constituting an image corresponding to the input image data.
In the following description, the "nth pixel" in the above information refers to the pixel in the upper left corner of a desired image (a rectangular image as a whole: corresponding to a recording area) as shown in FIG. As the pixel, number the second pixel and the third pixel toward the right, and the right end (for example,
Next to the α pixel in the first row) is the leftmost pixel one step below (the first pixel in the second row: α + 1 pixel)
It is a pixel number when counted as.

Further, in the second modification, the low temperature coloring layer 13 is colored cyan (C), the medium temperature coloring layer 15 is colored magenta (M), and the high temperature coloring layer 17 is colored yellow (Y).
In this case, the color of the low temperature color development layer 13, the color development of the medium temperature color development layer 15, and the color development of the high temperature color development layer 17
When distinguishing the color development of, c, m, and y are used as subscripts. If there is no subscript, it is not limited to any color development layer and is generalized.

FIG. 10 is a processing flowchart for shortening the total recording time in laser recording.
FIG. 11 is an explanatory diagram for determining a sub-recording area in the second modification.
First, when the recorded image data is input (step S1), the control unit 104 converts the recorded image data into CMY data (step S2).

That is, when the recorded image data 50 shown in FIG. 11A is input, the control unit 104 sets the control unit 104.
As shown in FIGS. 11 (b) to 11 (d), the data is converted into cyan (C) data, magenta (M) data, and yellow (Y) data. In FIG. 11, for ease of understanding, four images (C, M,) of cyan monochromatic, magenta monochromatic, yellow monochromatic, and black (= C + M + Y)
It is assumed that (character images of Y and K) are included in the image corresponding to the recorded image data.

Next, the control unit 104 acquires CMY image data I and pixel position data P based on the converted cyan data, magenta data, and yellow data (step S3).
Subsequently, the control unit 104 sets the variable tem = 1 for specifying the recording cycle T (step S4).

Then, the control unit 104 sets the laser scanning speed Vtem at the recording pixel when recording the pixels in a plurality of regions (start points Ps1 to PsX and end points Pf1 to PfX of the plurality of sub-recording areas) that can be recorded in the periodic Ttem. And the calculation (calculation) is performed based on the laser scanning speed Ve in the non-recording pixel that does not record the pixel (step S5).
In the case of FIG. 11 (e), that is, for cyan data, the first sub-recording area (corresponding to the position of the pixel 61) is based on the laser scanning speed Vtem of the recording pixel 51 and the laser scanning speed Ve of the non-recording pixel 52. The range of the end point Pf1 corresponding to the positions of the start point Ps1 and the pixel 62) and the second sub-recording area (the range of the end point Pf2 corresponding to the positions of the start point Ps2 and the pixel 64 corresponding to the position of the pixel 63). Is calculated (calculated).

Further, in the case of FIG. 11F, that is, for magenta data, it corresponds to the first sub-recording area (corresponding to the position of the pixel 65) based on the laser scanning speed Vtem in the recording pixel and the laser scanning speed Ve in the non-recording pixel. The range of the end point Pf1 corresponding to the positions of the start point Ps1 and the pixel 66) and the second sub-recording area (the range of the end point Pf2 corresponding to the positions of the start point Ps2 and the pixel 68 corresponding to the position of the pixel 67). Is calculated (calculated).

Further, in the case of FIG. 11 (g), that is, for the yellow data, since there is only one sub-recording area based on the laser scanning speed Vtem in the recording pixel and the laser scanning speed Ve in the non-recording pixel, the sub-recording is concerned. The area (the range of the start point Ps1 corresponding to the position of the pixel 69 and the end point Pf1 corresponding to the position of the pixel 70) is calculated (calculated).

Here, the calculation process (step S5) of a plurality of regions that can be recorded in the periodic Ttem will be described in detail.
FIG. 12 is a detailed processing flowchart of the calculation processing of a plurality of regions that can be recorded in the periodic Ttem in the second modification.

In the second modification, the time in which the heat given to the surface of the recording medium 10 by the irradiation of the laser beam LB to develop the color of a certain color-developing layer is transferred to the color-developing layer is used, and the other pixel recording is advanced during that time. , Pixels that can be recorded during the optimum irradiation repetition cycle of color development are set as one sub-recording area.

First, the control unit 104 determines whether or not the previously set cycle t _n-1 is smaller than the cycle Ttem (step S411).

In the determination of step S411, when the period t _n-1 is equal to or greater than the period Ttem (false) (step S411; No), up to the n-1st pixel is determined as one sub-recording area, and the nth pixel is determined. _{Is set to} the starting point P _{sX + 1} of the next sub-recording area, and further, set to X = X + 1 in order to proceed to the next area with t _n = 0 (step S423), and the process is set to step S420.
Move to.

In the determination of step S411, if the previously set cycle t _n-1 is smaller (true) than the cycle Ttem (step S411; Yes), the control unit 104 sets (n-1) in the lateral direction of the recorded image. Divide by the number of pixels of, and make A (integer part) + B (decimal part) of the quotient (step S412).

Subsequently, the control unit 104 determines whether or not B = 0 (step S413).
In the determination of step S413, if B = 0 (true) (step S413; Y
es), the control unit 104 adds the time required for idling to move from the rightmost pixel to the leftmost pixel one step below to the period t _n-1, and the start point P of the area X from the n-1st pixel. _The time required for _idling to move to _sX is subtracted (step S414), and the process _proceeds to step S416.

If B ≠ 0 (false) in the determination in step S413 (step S413; N)
o), the control unit 104, the start point of the area X from the (n-1) th pixel from the period _{t n-1 P sX}
The time required for idling to move to is subtracted (step S415).
Next, the control unit 104 determines whether or not the pixel In is a recording pixel (step S416).

In the determination of step S416, when the pixel In is a recording pixel (true) (step S416; Yes), the control unit 104 scans one pixel in the cycle tun and one pixel in the cycle tun-1 at the recording scanning speed. The time (R / Vtem) and the time required for _idling to move from the nth pixel to the start point P _sX are added and substituted (step S417), and the process _proceeds to step S419.

In the determination of step S416, when the pixel In is not a recording pixel but a non-recording pixel (false) (step S416; No), the control unit 104 sets the cycle tun to the cycle nt-1.
Substitutes the sum of the time (R / Ve) for idling one pixel and the time (D _n / Ve) required for _idling to move from the nth pixel to the start point P _sX (step S418). ).

Next, the control unit 104 adds 1 to the pixel number n (step S419).
Subsequently, the control unit 104 determines whether or not the pixel number n is smaller than the total number of pixels of the recorded image (step S420).

In the determination of step S420, if the pixel number n is smaller than the total number of pixels of the recorded image (true) (step S420; Yes), the process proceeds to step S411 again, and the processes of steps S411 to S420 are repeated. ..
In the determination in step S420, when the pixel number n is equal to or greater than the total number of pixels of the recorded image (false).
(Step S420; No), it is determined whether or not t _n = Ttem at that time (step S420; No).
Step S421).

In the determination of step S421, if t _n = Ttem at that time, (
Step S421; Yes), the process proceeds to step S6 (step S61).
In the determination of step S421, when t _n ≠ Ttem at that time (false)
(Step S421; No), with a waiting time Wait = T-t _n-1 (
Step S422), the process proceeds to step S6 (step S61).

Subsequently, the control unit 104 controls the laser head unit 102 and the drive unit 103, and repeats irradiation of the start point Ps1 to the end point Pf1 of the sub-recording area N times (step S61), and the start point Ps2 to the sub-recording area. Irradiation of the end point Pf2 is repeated N times (step S62), ..., Irradiation of the start point PsX to the end point PfX of the sub-recording area is repeated N times (step S6X) to Pf.
X), it is determined whether or not the variable tem = Cn (= number of types of color-developing layer) for specifying the recording cycle T is satisfied (step S7).

In the determination of step S7, when the variable tem <Cn, (step S7; No.
), Since the processing has not been completed yet, the control unit 104 adds 1 to the variable tem, initializes the start points Ps1 to PsX and the end points Pf1 to PfX (step S8), and shifts the processing to step S5 again. Then, the process proceeds to the next sub-recording area process, and the same process is repeated thereafter.
In the determination of step S7, when the variable tem = Cn (step S7; Ye
s), the process is terminated.

FIG. 13 is an explanatory diagram of the effect of the second modification.
According to the second modification, as shown in FIG. 13, a plurality of sub-recording areas 53 and 5 are set for each pixel.
4, ... Are determined, and recording is performed in the same cycle for each sub-recording area 53, 54, ... Therefore, even if the scanning speeds of the recording pixel and the non-recording pixel (idle pixel) are different, the cycle Ttem is adjusted. It is possible to repeatedly irradiate and simultaneously record the area that can be recorded in the periodic Ttem. Therefore, it is possible to significantly reduce the total recording time while stabilizing the color development state, and it is possible to improve the productivity of recording.

[4.3] Third Modified Example Similar to the second modified example, the third modified example has a configuration in which a plurality of recording dots (pixels) are recorded within a fixed recording time with respect to the recording medium 10. This is a modified example in which the total recording time until the end of the image recording process is shortened.

The difference from the second modification is that the sub-recording area that can be recorded in the periodic Ttem is not specified in pixel units, but is specified in rows at regular intervals.
In the third modification, the time in which the heat given to the surface of the recording medium by laser irradiation to develop the color of the color-developing layer to be recorded is transferred to the color-developing layer is used, and the other pixel recording is advanced during that time, so that the color is developed. The number of lines that can be recorded during the optimum irradiation repetition cycle of is calculated, and the lines to be recorded as one recording area are arranged at regular intervals over the entire desired recorded image, and this is used as one unit recording area.
The calculation of the sub-recording area is performed in step S5 of FIG. 10 as in the second modification.

FIG. 14 is a detailed processing flowchart of the calculation processing of a plurality of regions that can be recorded in the periodic Ttem in the third modification.
FIG. 15 is an explanatory diagram for determining a sub-recording area in the third modification.
First, the control unit 104 assumes that all one line in the width direction of the image corresponding to the input recorded image data 50 is a recording pixel, and advances by one line in the width direction at the laser scanning speed of the recording pixel. The required time is calculated and set to A (step S431).

Next, the control unit 104 calculates how many lines can be recorded in the width direction in the period Ttem, and sets B (integer part) + C (decimal part) (step S432).
Subsequently, the control unit 104 determines whether or not the fractional part C = 0 (step S433).

In the determination of step S433, if C = 0 (true) (step S433; Yes).
, B = B-1, and the number of lines that can be recorded in the periodic Ttem is reduced by one line (step S434).
The process proceeds to step S436. This is to secure the time to _idle from the end point P _fX of each recording area to the start point P _sX of the recording area.

Further, in the determination of step S433, if C ≠ 0 (false) (step S433; No.
), The control unit 104 shifts the process to step S436 without changing it as B = B (step S435), and calculates how many pixels (total number of lines to be recorded) are in the height direction of the recorded image. , Calculate the quotient of the value divided by the number of lines B that can be recorded in the period Ttem, and D (integer part) + E
(Decimal part) (step S436).

Next, the control unit 104 determines whether X indicating the number of the unit recording area is smaller than B × E, and determines whether or not the last line of the sub-recording area is outside the desired recorded image. judge(
S437).

In the determination of step S437, if X indicating the number of the unit recording area is smaller (true) than B × E (step S437; Yes), B = B remains unchanged (step S).
438), the process proceeds to step S440.

In the determination of step S437, if X indicating the number of the unit recording area is B × E or more (false) (step S437; No), the control unit 104 sets B = B-1 and the waiting time. Wait = A + AC (step S439).

Next, the control unit 104 calculates the pixel number of the start point P _sX and the end point P _{fX of the Xth} sub-recording area, and stores the start point P _sX and the end point P _fX (step S440).
Next, the control unit 104 determines whether or not X is smaller than the value obtained by adding 1 to the last number of recording areas D by setting X = X + 1 (step S441) in order to process the next sub recording area. (Step S442).

In the determination of step S442, if X is smaller (true) than the value obtained by adding 1 to the last number of recording areas D (step S442; Yes), the process is shifted to step S437 again, and steps S437 to step S437 are performed. The process of S442 is repeated.

In the determination of step S442, if X is equal to or greater than the value obtained by adding 1 to the last number of recording areas D (false) (step S442; No), the process is performed in step S6 (step S6).
The process proceeds to 1), and the same processing as in the second modification is performed below.

According to the third modification, as shown in FIG. 15, a plurality of sub-recording areas 53, 54, ... Are determined on a line-by-line basis (in FIG. 15, as a group of rows every other row), and at regular intervals. Since the number of lines is opened for recording, when recording is performed in the same cycle for each sub-recording area 53, 54, ..., The effect of heat remaining when recording adjacent lines or neighboring lines is reduced. As a result, the total recording time can be significantly shortened while stabilizing the color development state, and the productivity of recording can be improved.

[4.4] Fourth Modified Example FIG. 16 is an explanatory diagram of the effect of the fourth modified example.
In the above-mentioned second modification or third modification, the sub-recording area is set for each pixel or line, but as shown in FIG. 16, the sub-recording area is divided into the width direction and the height direction. It is also possible to configure it to set 53 to 57.

[4.5] Fifth Modified Example FIG. 17 is an explanatory diagram of the fifth modified example.
In the above description, the spot diameter of the laser beam at the time of image recording has not been described in detail, but the spot control unit 102A controls the optical system to control the spot diameter of the laser beam on the surface of the recording medium. However, the farther the coloring layer is from the surface (in the case of the above embodiment, the higher temperature coloring layer 17 → the medium temperature coloring layer 15 → the low temperature coloring layer 13), the smaller the spot diameter on the surface of the recording medium of the laser light is, and each color is developed. It is also possible to configure the size of the recording dots (minimum color development region) in the layer to be constant.

More specifically, in the case of the example of FIG. 17, FIG. 17 (c) is made so that the diameters of the coloring regions are equal.
Spot diameter SPh at the time of recording of the high temperature coloring layer 17 shown in FIG. 17> The medium temperature coloring layer 15 shown in FIG. 17 (b).
Spot diameter SPm at the time of recording> Spot diameter SPl at the time of recording of the low temperature coloring layer 13 shown in FIG. 17 (a).
With this configuration, it is possible to record a full-color image with a higher resolution.

[4.6] Sixth Modification Example In the above description, the irradiation time of the laser beam LB was controlled in an analog manner, but the laser beam is pulsed and the irradiation time of the laser beam LB is digitally determined by the number of pulses. It is also possible to configure it to control.

[4.7] Seventh Modification Example In addition to the irradiation control of the laser beam LB, the recording medium 10 itself by blowing air, heating and cooling the recording stage 101, or the surrounding environmental temperature is controlled to further increase the recording speed. It is also possible to improve.

[4.8] Eighth Modification Example In the above description, the case where the color-developing layer has three layers has been described, but the case where there are two layers and 4
The same can be applied to the case of layers or more.

[4.9] Ninth Modification Example The control unit 104 of the laser recording device 100 of the present embodiment includes a control device such as a CPU and an RO.
It is equipped with a storage device such as M (Read Only Memory) and RAM, an external storage device such as an HDD and a CD drive device, a display device such as a display device, and an input device such as a keyboard and a mouse. It is the hardware configuration used.

The program executed by the control unit 104 of the laser recording apparatus 100 of the present embodiment is a file in an installable format or an executable format, and is a CD-ROM, a flexible disk (FD), a CD-R, or a DVD (Digital Versaille Disk). ) Etc. are recorded on a computer-readable recording medium and provided.

In addition, the program executed by the control unit 104 of the laser recording device 100 of the present embodiment is
It may be configured to be provided by storing it on a computer connected to a network such as the Internet and downloading it via the network. Further, the program executed by the control unit 104 of the laser recording device 100 of the present embodiment may be provided or distributed via a network such as the Internet.

Further, the program of the control unit 104 of the laser recording device 100 of the present embodiment may be configured to be provided by incorporating it in a ROM or the like in advance.

As described above, the laser recording apparatus of the embodiment includes heat-sensitive materials having different color development threshold temperatures, and the threshold temperature of the heat-sensitive material contained through the intermediate layer that performs heat insulation and heat transfer. A laser recording device that records by irradiating a recording medium having a plurality of heat-sensitive recording layers laminated from the surface side on which the laser beam is irradiated so as to be high with the laser beam.
The power density of the laser beam is relatively high during recording of the heat-sensitive recording layer having a high threshold temperature, and the laser beam has an effectively longer irradiation time during recording of the heat-sensitive recording layer having a low threshold temperature. Although the control unit is provided for recording the heat-sensitive recording layer to be recorded by irradiating the light, the following aspects are also possible as the embodiment.

In the first aspect, when the control unit records the same recording position by irradiating the laser beam a plurality of times, the recording area is divided into a plurality of sub-recording areas, and the same heat-sensitive recording layer is used. The irradiation cycle of the laser beam in each of the sub-recording areas may be controlled to be the same.
Further, in the second aspect, the spot control unit for controlling the spot diameter of the laser beam is provided, and the control unit is described via the spot control unit according to the stacking position of the thermal recording layer to be recorded. The spot diameter of the laser beam may be changed.

Further, in the third aspect, the control unit increases the spot diameter as the heat-sensitive recording layer is laminated on the surface side irradiated with the laser light, and the recording is formed on the plurality of heat-sensitive recording layers. The size of the dots may be constant.

Further, in the fourth aspect, the wavelength of the laser beam may be set to 800 to 12000 nm.

Further, in the fifth aspect, the heat-sensitive recording layer of the recording medium is provided for each of the three primary colors that perform color expression by subtractive color mixing, and the control unit forms a color image based on the input image data. You may do it.

Further, heat-sensitive materials having different color development threshold temperatures are included, and the surface side to which the laser beam is irradiated so that the threshold temperature of the heat-sensitive material contained through the intermediate layer for heat insulation and heat transfer becomes high. It is a method executed by a laser recording apparatus that irradiates a recording medium provided with a plurality of laminated heat-sensitive recording layers with the laser light to perform recording, and the more the recording of the heat-sensitive recording layer having a high threshold temperature, the more the said. The heat-sensitive recording layer to be recorded by irradiating the laser light with the process of setting the power density of the laser light relatively high and the irradiation time effectively longer than the recording time of the heat-sensitive recording layer having a low threshold temperature. It is also possible to have a method that includes a process of recording for.

[5] Fourth Embodiment By the way, the laser recording method of the first to third embodiments is a recording method in which each layer is selectively colored by controlling the laser irradiation conditions. Embodiment ~ Third
In the method of the embodiment, when recording with three primary colors, each color is recorded, so at least three scans are required, and in the case of mixed colors, the number of scans is equal to the number of colors to be mixed. Due to the duplication, it would take a lot of time to record.

Therefore, in the fourth embodiment, the power density, irradiation time, and irradiation cycle of the laser are controlled as parameters under specific conditions, and two or three colors adjacent to each other in the direction perpendicular to the incident direction of the laser are simultaneously developed. This is an embodiment for the purpose of shortening the recording time by causing the number of scans when recording the color mixture to occur.

In the following, the power density, irradiation time, and irradiation cycle of the laser are appropriately controlled when recording pixels in which multiple colors of the three primary colors are mixed on a recording medium in which color-developing layers of the three primary colors having different threshold temperatures are laminated. By doing so, a method will be described in which the color development temperatures are selectively different from each other and a plurality of (2 or 3 types in the present fourth embodiment) color development layers laminated in order according to the color development temperature are colored. ..

Instead of controlling the laser power density, irradiation time, and irradiation cycle, the laser power,
It is also possible to appropriately control the pulse width, scanning speed, delay time (interval time) at the time of repeated irradiation, spot diameter, and defocus amount.

FIG. 18 is an explanatory diagram of a color development principle in the plurality of colors of the fourth embodiment.
That is, FIG. 18A is a principle explanatory view in the case where the low temperature coloring layer 13 and the medium temperature coloring layer 15 are colored in parallel.
Further, FIG. 18B is an explanatory diagram of the principle when the medium temperature coloring layer 15 and the high temperature coloring layer 17 are colored in parallel.

Further, FIG. 18C is an explanatory diagram of the principle when the low temperature coloring layer 13, the medium temperature coloring layer 15, and the high temperature coloring layer 17 are colored in parallel.
As shown in FIG. 18A, when the laser beam LB for recording is irradiated under specific conditions, the color development target region CL of the low temperature color development layer 13 exceeds the color development threshold temperature ThL, and the color of the medium temperature color development layer 15 is developed. The target region CM exceeds the threshold temperature ThM for color development, and the high temperature color development layer 17 has the threshold temperature T for color development.
By not exceeding hH, low / medium temperature color mixing can be performed.

Similarly, as shown in FIG. 18B, when the laser beam LB for recording is irradiated under specific conditions, the color development target region CM of the medium temperature color development layer 15 exceeds the color development threshold temperature ThM, and the high temperature color development layer 1
By preventing the color development target region CH of No. 7 from exceeding the color development threshold temperature ThH and the low temperature color development layer 13 not exceeding the color development threshold temperature ThL, the medium / high temperature color development layer can be mixed.

Further, as shown in FIG. 18C, when the laser beam LB for recording is irradiated under specific conditions, the color development target region CL of the low temperature color development layer 13 exceeds the color development threshold temperature ThL, and the medium temperature color development layer 15
By making the color development target area CM of the above color development target region CM exceed the color development threshold temperature ThM and the color development target area CH of the high temperature color development layer 17 exceeding the color development threshold temperature ThH, low / medium / high temperature color development layer mixing can be performed.

FIG. 19 is an explanatory diagram of an energy-time relationship in which each color-developing layer in the fourth embodiment exceeds a threshold temperature for color development.
In FIG. 19, for each of the color-developing layers 13, 15, 17, the color-developing layers 13, 15,
A threshold arrival time curve at which the color development target region of 17 reaches the threshold temperature for color development is shown.

Specifically, the energy-time curve that the low-temperature color-developing layer 13 reaches the corresponding color-developing threshold temperature is the threshold arrival time curve LL shown by a broken line, and in FIG. It shows that the color-developing layer 13 develops color.

The energy-time curve that the medium-temperature color-developing layer 15 reaches the corresponding color-developing threshold temperature is the threshold arrival time curve LM shown by the alternate long and short dash line, and in FIG. 19, the medium-temperature color development layer is in the region above the threshold arrival time curve LM. It shows that 15 develops a color.

Further, the energy-time curve reaching the threshold temperature of color development corresponding to the high temperature color development layer 17 is the threshold value arrival time curve LH shown by a solid line, and in FIG. 19, the high temperature color development layer 17 is located in the region above the threshold value arrival time curve LH. It shows that it develops color.

Thus, the left end is defined by the threshold arrival time curve LL, the lower end is defined by the threshold arrival time curve LM, in the region A _LM right end is defined by the threshold arrival time curve LH, low-temperature color-forming layer 13 and the medium temperature color-forming layer 15 It shows that it develops color.

Further, the left end is defined by the threshold arrival time curve LH, lower end defined by the threshold arrival time curve LM, in the region A _MH upper end defined by the threshold arrival time curve LL, the medium temperature color-forming layer 15 and the high temperature color-forming layer 17 Color develops.
Further, in the region A _LMH where the left end is defined by the threshold arrival time curve LH and the lower end is defined by the threshold arrival time curve LL, it is shown that all of the low temperature coloring layer 13, the medium temperature coloring layer 15, and the high temperature coloring layer 17 develop color. ing.

In FIG. 19, the left end is defined by the threshold arrival time curve LL, area A _L where the right end is defined by the threshold arrival time curve LM, only the low-temperature color-forming layer 13 described in the first to third embodiments Indicates that is the area where color develops. Similarly, the upper end is the threshold arrival time curve L.
Is defined by L, the lower end is defined by the threshold arrival time curve LM, the area A _M of the right end is defined by the threshold arrival time curve LH, only medium temperature color-forming layer 15 described in the first to third embodiments is indicates a region which develops, the upper end is defined by the threshold arrival time curve LM, area a _H of the lower end is defined by the threshold arrival time curve LH is high temperature color development described in the first to third embodiments It shows that only the layer 17 is a color-developing region.

Here, an example of the laser irradiation condition will be described.
FIG. 20 is an explanatory diagram of an example of laser irradiation conditions.
In FIG. 20, the function of the energy E that gives the (low temperature) threshold arrival time curve LL shown in FIG. 19 is Tl (E), and the function of the energy E that gives the (medium temperature) threshold arrival time curve LM is Tm (E) [ When the unit is time], the function of energy E that gives the (high temperature) threshold arrival time curve LH is Th (E), and the time that actually gives energy is T (E).
By controlling the laser irradiation under the conditions as shown in FIG. 20, it is possible to cause a plurality of coloring layers to develop colors in parallel at the same time.

More specifically, when the medium temperature coloring layer 15 and the high temperature coloring layer 17 are to be colored,
T (E) <Tl (E) and T (E)> Tm (E) and T (E)> Th (E)
Must be met.

Next, a specific configuration example of the recording medium 10 will be described.
FIG. 21 is an explanatory diagram of a specific configuration example of the recording medium.
The base material 12 constituting the recording medium 10 has a thickness of, for example, 100 μm.
The thermal conductivity ratio is, for example, 0.01 to 5.00 W / m / K.

The thickness of the low-temperature color-developing layer 13 is, for example, 1 to 10 μm, and the thermal conductivity ratio is, for example, 0.1 to 10 W / m / K.
The thickness of the first spacer 14 is, for example, 7 to 100 μm.
The thermal conductivity ratio is, for example, 0.01 to 1 W / m / K.

The thickness of the medium-temperature coloring layer 15 is, for example, 1 to 10 μm, and the thermal conductivity ratio is, for example, 0.1 to 10 W / m / K.
The thickness of the second spacer 16 is, for example, 1 to 10 μm, and the thermal conductivity ratio is, for example, 0.01 to 1 W / m / K.

The thickness of the high-temperature coloring layer 17 is, for example, 0.5 to 5 μm, and the thermal conductivity ratio is, for example, 0.1 to 10 W / m / K.
The thickness of the protective layer 18 is, for example, 0.5 to 5 μm, and the thermal conductivity ratio is, for example, 0.01 to 1 W / m / K.

[5.1] First Aspect First, a first aspect of the fourth embodiment will be described.
FIG. 22 is an explanatory diagram of a color development method by mixing a plurality of colors according to the first aspect.
In FIG. 22, when the low temperature coloring layer 13 is a cyan (C) coloring layer, the medium temperature coloring layer 15 is a magenta (M) coloring layer, and the high temperature coloring layer 17 is a yellow (Y) coloring layer, laser light is irradiated. The temperature change of each of the color-developing layers 13, 15 and 17 in the case of the above is explained.
In this case, the rate of change in temperature is set by setting (changing) the power density of the laser according to the combination of the color-developing layers to be colored.

First, a case where blue (B) is developed will be described.
FIG. 22A shows the temperature change rate when the cyan color-developing layer 13 which is the low-temperature color-developing layer 13 and the magenta color-developing layer 15 which is the medium-temperature color-developing layer 15 are developed, and the laser beam is irradiated to obtain blue (B). It is a temperature-time curve when color is developed.
As shown in FIG. 22 (a), the magenta color-developing layer, which is the medium-temperature color-developing layer 15, starts color development at time t11.

Then, the time t12 when the cyan color-developing layer, which is the low-temperature color-developing layer 13, starts color development (at this point, blue starts color development) has passed, and the time t13 immediately before the yellow color-development layer, which is the high-temperature color-development layer 17, develops color. Time until any time of TCM is irradiated with laser light LB until
By stopping the irradiation, blue (B) can be developed.

Next, a case where red (R) is developed will be described.
FIG. 22B shows the temperature change rate when the magenta color-developing layer 15 is the medium-temperature color-developing layer 15 and the yellow color-developing layer 17 which is the high-temperature color-developing layer 17 is set, and laser light is irradiated to obtain red (R). It is a temperature-time curve when color is developed.

As shown in FIG. 22B, the magenta color-developing layer, which is the medium-temperature color-developing layer 15, starts color development at time t14.
Then, the time t15 when the yellow color-developing layer, which is the high-temperature color-developing layer 17, starts to develop color (at this point, red starts to develop color) has passed, and the time t16 immediately before the cyan-color-development layer, which is the low-temperature color-developing layer 13, develops color. Irradiate the laser beam LB until any time of TMY.
By stopping the irradiation, red (R) can be developed.

Next, a case where black (K) is developed will be described.
FIG. 22C shows the temperature change rate when all of the cyan color-developing layer 13 which is the low-temperature color-developing layer 13, the magenta color-developing layer which is the medium-temperature color-developing layer 15, and the yellow color-developing layer which is the high-temperature color-developing layer 17 are colored. , It is a temperature-time curve when irradiating a laser beam to develop a color of black (K).
As shown in FIG. 22C, the yellow coloring layer, which is the high temperature coloring layer 17, starts coloring at time t17.

Then, at time t18 when the magenta color-developing layer, which is the medium-temperature color-developing layer 15, begins to develop color (at this point, red starts to develop color), and at time t19, when the cyan-color-development layer, which is the low-temperature color-developing layer 13, develops color. When it reaches, black begins to develop color.
Therefore, black (K) can be developed by irradiating the laser beam LB until an appropriate time after time t19 and stopping the irradiation.

FIG. 23 is an explanatory diagram of a color development method using a single color.
Also in FIG. 23, when the low temperature coloring layer 13 is a cyan (C) coloring layer, the medium temperature coloring layer 15 is a magenta (M) coloring layer, and the high temperature coloring layer 17 is a yellow (Y) coloring layer, laser light is irradiated. The temperature change of each of the coloring layers 13, 15 and 17 in the case of the above is explained.
Also in this case, the rate of change in temperature is set by setting (changing) the power density of the laser according to the combination of the color-developing layers to be colored, as in the case of FIG. 22.

First, a case where cyan (C) is independently colored will be described.
FIG. 23 (a) shows a temperature-time curve when the cyan (C) color is developed by irradiating the laser beam with the temperature change rate set to the temperature change rate when the cyan color layer 13 which is the low temperature color development layer is developed independently. Is.
As shown in FIG. 23A, the cyan color-developing layer, which is the low-temperature color-developing layer 13, starts color development at time t21.

Then, the laser beam LB is irradiated until any time in TC until the time t22 immediately before the magenta color-developing layer, which is the medium-temperature color-developing layer 15, develops color, and the irradiation is stopped to obtain cyan (C). Can be colored independently.

Next, a case where the magenta (M) is independently colored will be described.
FIG. 23B shows a temperature-time curve when the magenta color-developing layer, which is the medium-temperature color-developing layer 15, is set to the temperature change rate when the magenta color-developing layer is independently developed, and is irradiated with laser light to develop the magenta (M) color. Is.

As shown in FIG. 23 (b), the magenta color-developing layer, which is the medium-temperature color-developing layer 15, starts color development at time t22.
Then, the laser light LB is irradiated to any time in the time TM until the time t23 immediately before the yellow color-developing layer, which is the high-temperature color-developing layer 17, starts to develop color, and the irradiation is stopped to magenta ( M) can be independently colored.

Next, a case where yellow (Y) is developed will be described.
FIG. 23 (c) is a temperature-time curve when the yellow (Y) color is developed by irradiating the laser beam with the temperature change rate when the yellow color-developing layer is independently developed.
As shown in FIG. 23 (c), the yellow coloring layer, which is the high temperature coloring layer 17, starts coloring at time t24.

Then, the magenta color-developing layer, which is the medium-temperature color-developing layer 15, is irradiated with the laser beam LB until any time in the time TY until the time t25 immediately before the start of color development, and the irradiation is stopped to yellow (yellow). Y) can be independently colored.

Next, the operation of the first aspect of the fourth embodiment will be described.
FIG. 24 is an operation flowchart of the first aspect of the fourth embodiment.
First, when the recorded image data is input (step S11), the control unit 104 divides (converts) the recorded image data into RGB data (step S12).

Next, the control unit 104 binarizes the converted R (red) data, G (green) data, and B (blue) data (step S13).
Then, the control unit 104 converts the binarized RGB data of each pixel into CMYRBK data (step S14). That is, cyan (C), magenta (M), yellow (Y).
, Red (R), blue (B), and black (K) are converted into data. Here, the reason why green (G) is not contained is that, in the case of the fourth embodiment, the cyan coloring layer which is the low temperature coloring layer 13 and the yellow coloring layer which is the high temperature coloring layer 17 pass through the spacer layer. Because they are not stacked next to each other
This is because simultaneous color development cannot be performed.

Subsequently, the control unit 104 controls the laser head unit 102 and the drive unit 103 to control cyan (C), magenta (M), yellow (Y), red (R), blue (B), and black (K). The image is recorded by developing each color of.

Here, the process of converting the RGB data of each binarized pixel into CMYRBK data (step S14) will be described in detail.

FIG. 25 is a flowchart of the conversion process to CMYRBK data.
In the process of step S14, the control unit 104 first determines the RGB data (combination of binarized data) of each pixel (step S141).

Subsequently, the control unit 104 performs a process of converting the RGB data into CMYRBK data based on the combination of the binarized data (step S142).
Specifically, the control unit 104 has a combination of RGB data binarized data (0,1,1).
That is, when (R, G, B) = (0,1,1), the CMYRBK data is set as follows (step S1421).
(R, G, B) = (0,1,1)
→ (C, M, Y, R, B, K) = (1,0,0,0,0,0)

Similarly, when the combination of the binarized data of the RGB data is (1,0,1), that is, (R, G, B) = (1,0,1), the control unit 104 determines the CMYRBK data. Is set as follows (step S1422).
(R, G, B) = (1,0,1)
→ (C, M, Y, R, B, K) = (0,1,0,0,0,0)

Further, when the combination of the binarized data of the RGB data is (1,1,0), that is, (R, G, B) = (1,1,0), the control unit 104 sets the CMYRBK data as follows. (Step S1423).
(R, G, B) = (1,1,0)
→ (C, M, Y, R, B, K) = (0,0,1,0,0,0)

Further, when the combination of the binarized data of the RGB data is (1,1,0), that is, (R, G, B) = (1,0,0), the control unit 104 sets the CMYRBK data as follows. (Step S1424).
(R, G, B) = (1,0,0)
→ (C, M, Y, R, B, K) = (0,0,0,1,0,0)

Further, when the combination of the binarized data of the RGB data is (0,1,0), that is, (R, G, B) = (0,1,0), the control unit 104 sets the CMYRBK data as follows. (Step S1425).
(R, G, B) = (0,1,0)
→ (C, M, Y, R, B, K) = (1,0,1,0,0,0)

Further, when the combination of the binarized data of the RGB data is (0,0,1), that is, (R, G, B) = (0,0,1), the control unit 104 sets the CMYRBK data as follows. (Step S1426).
(R, G, B) = (0,0,1)
→ (C, M, Y, R, B, K) = (0,0,0,0,1,0)

Further, when the combination of the binarized data of the RGB data is (0,0,0), that is, (R, G, B) = (0,0,0), the control unit 104 sets the CMYRBK data as follows. (Step S1427).
(R, G, B) = (0,0,0)
→ (C, M, Y, R, B, K) = (0,0,0,0,0,1)

Further, when the combination of the binarized data of the RGB data is (1,1,0), that is, (R, G, B) = (1,1,1), the control unit 104 sets the CMYRBK data as follows. (Step S1428).
(R, G, B) = (1,1,1)
→ (C, M, Y, R, B, K) = (0,0,0,0,0,0)
This is because (R, G, B) = (1,1,1) represents white, so recording (printing)
Because there is no need for.

Then, the control unit 104 records (prints) “1” in the CMYRBK data, “0”.
CMYRBK data is recorded with "" as a non-recording (non-printing) pixel (step S143).
..
As described above, since recording is performed, full-color recording can be performed in a short time as compared with the case where all are recorded in a single color.

[5.1.1] Modification example of the first aspect of the fourth embodiment FIG. 26 is an operation flowchart of the modification of the first aspect of the fourth embodiment.
In FIG. 26, the same parts as those in FIG. 25 are designated by the same reference numerals. In FIG. 26, the difference from the first aspect of FIG. 25 is that the binarized RGB data is converted into CMY data and processed.

According to the modification of the first aspect of the fourth embodiment, when the recorded image data is input (step S11), the control unit 104 divides (converts) the recorded image data into RGB data (step S12).

Next, the control unit 104 binarizes the converted R (red) data, G (green) data, and B (blue) data (step S13).
Then, the control unit 104 converts the binarized RGB data of each pixel into CMYRBK data (step S14).

Subsequently, the control unit 104 controls the laser head unit 102 and the drive unit 103 to control cyan (C), magenta (M), yellow (Y), red (R), blue (B), and black (K). The image is recorded by developing each color of.

Here, the process of converting the RGB data of each binarized pixel into CMYRBK data (step S14) will be described in detail.
In the process of step S14, the control unit 104 first converts RGB data into CMY data (step S141A).

Subsequently, the control unit 104 determines the CMY data (combination of binarized data) of each pixel (step S141B).
Subsequently, the control unit 104 performs a process of converting to CMYRBK data, which is recording data, based on the combination of binarized data of CMY data (step S142A).

Specifically, the control unit 104 has a combination of binarized data of CMY data (1,0,0).
That is, when (C, M, Y) = (1,0,0), the CMYRBK data is set as follows (step S1421).
(C, M, Y) = (1,0,0)
→ (C, M, Y, R, B, K) = (1,0,0,0,0,0)

Similarly, the control unit 104 controls the CMYRBK data when the combination of the binarized data of the CMY data is (0,1,0), that is, (C, M, Y) = (0,1,0). Is set as follows (step S1422).
(C, M, Y) = (0,1,0)
→ (C, M, Y, R, B, K) = (0,1,0,0,0,0)

Further, when the combination of the binarized data of the CMY data is (0,0,1), that is, (C, M, Y) = (0,0,1), the control unit 104 sets the CMYRBK data as follows. (Step S1423).
(C, M, Y) = (0,0,1)
→ (C, M, Y, R, B, K) = (0,0,1,0,0,0)

Further, when the combination of the binarized data of the CMY data is (0,1,1), that is, (C, M, Y) = (0,1,1), the control unit 104 sets the CMYRBK data as follows. (Step S1424).
(C, M, Y) = (0,1,1)
→ (C, M, Y, R, B, K) = (0,0,0,1,0,0)

Further, when the combination of the binarized data of the CMY data is (1,0,1), that is, (C, M, Y) = (1,0,1), the control unit 104 sets the CMYRBK data as follows. (Step S1425).
(C, M, Y) = (1,0,1)
→ (C, M, Y, R, B, K) = (1,0,1,0,0,0)

Further, when the combination of the binarized data of the CMY data is (1,1,0), that is, (C, M, Y) = (1,1,0), the control unit 104 sets the CMYRBK data as follows. (Step S1426).
(C, M, Y) = (1,1,0)
→ (C, M, Y, R, B, K) = (0,0,0,0,1,0)

Further, when the combination of the binarized data of the CMY data is (1,1,1), that is, (C, M, Y) = (1,1,1), the control unit 104 sets the CMYRBK data as follows. (Step S1427).
(C, M, Y) = (1,1,1)
→ (C, M, Y, R, B, K) = (0,0,0,0,0,1)

Further, when the combination of the binarized data of the CMY data is (0,0,0), that is, (C, M, Y) = (0,0,0), the control unit 104 sets the CMYRBK data as follows. (Step S1428).
(C, M, Y) = (0,0,0)
→ (C, M, Y, R, B, K) = (0,0,0,0,0,0)
This is because (C, M, Y) = (0,0,0) represents white, so recording (printing)
Because there is no need for.

Then, the control unit 104 records (prints) “1” in the CMYRBK data, “0”.
CMYRBK data is recorded with "" as a non-recording (non-printing) pixel (step S143).
..
Since the recording is performed as described above, even in this modified example, full-color recording can be performed in a short time as compared with the case where all are recorded in a single color.

[5.1.2] Second aspect of the fourth embodiment Next, the operation of the second aspect of the fourth embodiment will be described.
FIG. 27 is an operation flowchart of the second aspect of the fourth embodiment.
First, when the recorded image data in the RGB data format is input to the control unit 104 (
Step S21), RGB data is converted into CMY data (step S22).

Next, the control unit 104 binarizes the converted C (cyan) data, M (magenta) data, and Y (yellow) data (step S23).
Then, the control unit 104 converts the binarized CMY data of each pixel into CMYRBK data (step S24). That is, cyan (C), magenta (M), yellow (Y).
, Red (R), blue (B), and black (K) are converted into data.

Subsequently, the control unit 104 controls the laser head unit 102 and the drive unit 103 to control cyan (C), magenta (M), yellow (Y), red (R), blue (B), and black (K). The image is recorded by developing each color of (step S25).

Here, the process of converting the CMY data of each binarized pixel into CMYRBK data (step S24) will be described in detail.

FIG. 28 is a flowchart of the conversion process to CMYRBK data.
In FIG. 28, the same parts as those in FIG. 26 are designated by the same reference numerals, and detailed description thereof will be incorporated.
In the process of step S24, the control unit 104 first determines the CMY data (combination of binarized data) of each pixel (step S241).

Subsequently, the control unit 104 performs a process of converting to CMYRBK data, which is recording data, based on the combination of binarized data of CMY data (step S242).
Then, as in the modified example of the first aspect of the fourth embodiment, steps S1421 to step S1
The processing of 425 and step S143 is performed.

As described above, since the second aspect of the fourth embodiment records, even in the second aspect of the fourth embodiment, full-color recording can be performed in a shorter time than in the case of recording all in a single color. ..

[6] Fifth Embodiment Next, the fifth embodiment will be described.

FIG. 29 is a schematic configuration explanatory view of the recording medium used in the fifth embodiment.
As shown in FIG. 1, the recording medium 10A has a low temperature coloring layer 13, a first spacer layer 14, a medium temperature coloring layer 15, a second spacer layer 16, a high temperature coloring layer 17, a protective layer 18, and peeling on the base material 12. Layer 1
91 and the photo / thermal conversion layer 192 are laminated in this order. Here, the base material 12, the low temperature coloring layer 13, the first spacer layer 14, the medium temperature coloring layer 15, the second spacer layer 16, the high temperature coloring layer 17,
The protective layer 18 is the same as in each of the above embodiments.

In the above configuration, the release layer 191 is a layer for peeling the light / heat conversion layer 192 after the recording is completed.
Further, the light / heat conversion layer 192 is a layer for absorbing visible light and converting it into heat energy, and in order to efficiently absorb the laser LB, it contains pigments and dyes of colors including complementary colors of the laser LB. It is preferable to have. Alternatively, it can be black and contain components such as carbon black that absorb any visible light.

With such a configuration, according to the fifth embodiment, when recording with the laser LB, a laser having a shorter wavelength can be used, and the minimum spot diameter at the time of focusing is reduced to increase the resolution. , It is possible to achieve high definition.

[7] Sixth Embodiment In the above description, the embodiment of conversion to CMYRBK data has been described prior to image recording, but in the sixth embodiment, G (green) is further added to the CMYRGBK data. It is an embodiment in the case of conversion.

First, the principle of the sixth embodiment will be described.
In the recording media 10 and 10A described above, when the laser LB is controlled with a constant power density or a constant irradiation cycle, the low temperature coloring layer 13 and the high temperature coloring layer 17 are colored, and only the medium temperature coloring layer 15 is formed. It was not possible to control the color not to develop.
Therefore, in the sixth embodiment, the power density, irradiation cycle, irradiation time, and the like of the laser LB are modulated so that only the medium temperature coloring layer 15 is not colored.

FIG. 30 is an explanatory diagram of the recording control of the sixth embodiment.
Specifically, as shown in FIG. 30, by changing the temperature of the surface layer (surface layer of the protective layer 18) of the recording medium 10 as shown in the temperature curve TTS, the temperature of the high temperature coloring layer 17 is changed to the temperature curve TTY. As shown in time t31 to time t32, the temperature of the high temperature coloring layer 18 is changed so as to exceed the threshold temperature ThH to develop color.
Then, between the time t32 and the time t34, the temperature of the surface layer of the recording medium 10 is set to the threshold temperature Th.
A predetermined temperature is set between H and the threshold temperature ThM. As a result, the temperature of the medium temperature coloring layer 15 becomes a predetermined temperature between the threshold temperature ThM and the threshold temperature ThC as shown in the temperature curve TTM.
The medium temperature coloring layer 15 does not develop color.
On the other hand, the temperature of the low temperature coloring layer 13 is determined at time t33 as shown in the temperature polarity TTC.
The threshold temperature ThL is exceeded.
In parallel with this, by controlling the laser LB so that the temperature of the surface layer of the recording medium 10 becomes less than the threshold temperature ThL at time t34, the temperature of the high temperature coloring layer 17 and the temperature of the medium temperature coloring layer 15
And the temperature of the low temperature coloring layer 13 gradually decreased, and at time t35, the low temperature coloring layer 13
The temperature of is below the threshold temperature ThL as shown in the temperature polarity TTC, and the recording ends.
Since the irradiation control of the laser LB and the temperature control of the recording medium 10 are performed in this way, it is possible to prevent the color development of only the medium temperature color development layer 15 and to develop the color of G (green).

Next, the operation of the sixth embodiment will be described.
FIG. 31 is an operation flowchart of the sixth embodiment.
First, when the recorded image data is input (step S31), the control unit 104 divides (converts) the recorded image data into RGB data (step S32).

Next, the control unit 104 binarizes the converted R (red) data, G (green) data, and B (blue) data (step S33).
Then, the control unit 104 converts the binarized RGB data of each pixel into CMYRGBK data (step S34). That is, cyan (C), magenta (M), yellow (Y).
), Red (R), green (G), blue (B), and black (K).

Subsequently, the control unit 104 controls the laser head unit 102 and the drive unit 103 to control cyan (C), magenta (M), yellow (Y), red (R), green (G), and blue (B). And black (K)
The image is recorded by developing each color of (step S35).

Here, the process of converting the binarized RGB data of each pixel into CMYRGBK data (step S14) will be described in detail.
FIG. 32 is a flowchart of the conversion process to CMYRGBK data.
In the process of step S34, the control unit 104 first determines the RGB data (combination of binarized data) of each pixel (step S341).

Subsequently, the control unit 104 performs a process of converting to CMYRGBK data, which is recording data, based on the combination of binarized RGB data (step S342).
Specifically, the control unit 104 has a combination of RGB data binarized data (0,1,1).
That is, in the case of (R, G, B) = (0,1,1), the CMYRGBK data is set as follows (step S3421).
(R, G, B) = (0,1,1)
→ (C, M, Y, R, G, B, K) = (1,0,0,0,0,0,0)

Similarly, when the combination of the binarized data of the RGB data is (1,0,1), that is, (R, G, B) = (1,0,1), the control unit 104 determines the CMYRGBK data. Is set as follows (step S3422).
(R, G, B) = (1,0,1)
→ (C, M, Y, R, G, B, K) = (0,1,0,0,0,0,0)

Further, when the combination of the binarized RGB data is (1,1,0), that is, (R, G, B) = (1,1,0), the control unit 104 sets the CMYRGBK data as follows. (Step S3423).
(R, G, B) = (1,1,0)
→ (C, M, Y, R, G, B, K) = (0,0,1,0,0,0,0)

Further, when the combination of the binarized RGB data is (1,1,0), that is, (R, G, B) = (1,0,0), the control unit 104 sets the CMYRGBK data as follows. (Step S3424).
(R, G, B) = (1,0,0)
→ (C, M, Y, R, G, B, K) = (0,0,0,1,0,0,0)

Further, when the combination of the binarized data of the RGB data is (0,1,0), that is, (R, G, B) = (0,1,0), the control unit 104 sets the CMYRGBK data as follows. (Step S3425).
(R, G, B) = (0,1,0)
→ (C, M, Y, R, G, B, K) = (0,0,0,0,1,0,0)

Further, when the combination of the binarized data of the RGB data is (0,0,1), that is, (R, G, B) = (0,0,1), the control unit 104 sets the CMYRGBK data as follows. (Step S3426).
(R, G, B) = (0,0,1)
→ (C, M, Y, R, G, B, K) = (0,0,0,0,0,1,0)

Further, when the combination of the binarized data of the RGB data is (0,0,0), that is, (R, G, B) = (0,0,0), the control unit 104 sets the CMYRGBK data as follows. (Step S3427).
(R, G, B) = (0,0,0)
→ (C, M, Y, R, G, B, K) = (0,0,0,0,0,0,1)

Further, when the combination of the binarized RGB data is (1,1,0), that is, (R, G, B) = (1,1,1), the control unit 104 sets CMYRGBK as follows. (Step S3428).
(R, G, B) = (1,1,1)
→ (C, M, Y, R, G, B, K) = (0,0,0,0,0,0,0)
This is because (R, G, B) = (1,1,1) represents white, so recording (printing)
Because there is no need for.

Then, the control unit 104 records (prints) "1" in the CMYRGBK data, and "
CMYRGBK data is recorded with "0" as a non-recording (non-printing) pixel (step S34).
3).
As described above, since recording is performed, full-color recording including green (G) can be performed in a short time as compared with the case where all are recorded in a single color.

[7.1] First Aspect of the Sixth Embodiment FIG. 33 is an operation flowchart of the first aspect of the fourth embodiment.
In FIG. 33, the same parts as those in FIG. 32 are designated by the same reference numerals. In FIG. 33, the difference from the first aspect of FIG. 32 is that the binarized RGB data is converted into CMY data and processed.
According to the modification of the first aspect of the sixth embodiment, when the recorded image data is input (step S31), the control unit 104 divides (converts) the recorded image data into RGB data (step S32).

Next, the control unit 104 binarizes the converted R (red) data, G (green) data, and B (blue) data (step S33).
Then, the control unit 104 converts the binarized RGB data of each pixel into CMYRGBK data (step S34).

Subsequently, the control unit 104 controls the laser head unit 102 and the drive unit 103 to control cyan (C), magenta (M), yellow (Y), red (R), green (G), and blue (B). And black (K)
The image is recorded by developing each color of.

Here, the process of converting the binarized RGB data of each pixel into CMYRGBK data (step S34) will be described in detail.
In the process of step S34, first, the control unit 104 converts RGB data into CMY data (step S341A).
Subsequently, the control unit 104 determines the CMY data (combination of binarized data) of each pixel (step S341B).
Subsequently, the control unit 104 performs a process of converting to CMYRGBK data, which is recording data, based on the combination of binarized data of CMY data (step S342).
Then, the processes of steps S3421 to S3425 and step S343 are performed in the same manner as in the sixth embodiment.
As described above, since the first aspect of the sixth embodiment records, even in the modified example of the first aspect of the sixth embodiment, the full color can be achieved in a short time as compared with the case of recording all in a single color. You can record.

[7.2] Second Embodiment of the Sixth Embodiment Next, the operation of the second embodiment of the sixth embodiment will be described.
FIG. 34 is an operation flowchart of the second aspect of the sixth embodiment.
First, when the recorded image data in the RGB data format is input to the control unit 104 (
Step S41), the RGB data is converted into CMY data (step S42).

Next, the control unit 104 binarizes the converted C (cyan) data, M (magenta) data, and Y (yellow) data (step S43).
Then, the control unit 104 converts the binarized CMY data of each pixel into CMYRGBK data (step S44). That is, cyan (C), magenta (M), yellow (Y).
), Red (R), green (G), blue (B), and black (K).

Subsequently, the control unit 104 controls the laser head unit 102 and the drive unit 103 to control cyan (C), magenta (M), yellow (Y), red (R), green (g), blue (B), and the like. An image is recorded by developing each color of black (K) (step S45).

Here, the process of converting the CMY data of each binarized pixel into CMYRGBK data (step S44) will be described in detail.
FIG. 35 is a flowchart of the conversion process to CMYRGBK data.
In FIG. 35, the same parts as those in FIG. 33 are designated by the same reference numerals, and detailed description thereof will be incorporated.
In the process of step S44, the control unit 104 first determines the CMY data (combination of binarized data) of each pixel (step S441).
Subsequently, the control unit 104 performs a process of converting the CMYRBK data, which is the recording data, into the CMYRBK data based on the combination of the binarized data of the CMY data (step S442).
Then, the processes of steps S3421 to S3425 and step S343 are performed in the same manner as in the first aspect of the sixth embodiment.
As described above, since the second aspect of the sixth embodiment records, even in the second aspect of the sixth embodiment, full-color recording can be performed in a shorter time than in the case of recording all in a single color. ..

As described above, according to the fourth to sixth embodiments, since a plurality of colors can be developed in parallel at the same time, the device configuration can be simplified while maintaining and improving the quality of the recorded image. Full-color recording can be performed in a shorter time.
In the above description, the coloring layer is the low temperature coloring layer 13, the medium temperature coloring layer 15, and the high temperature coloring layer 17.
Although the three types of cases described above have been described, it is also possible to configure so as to provide four or more types of color-developing layers and similarly develop a plurality of color-developing layers in parallel.

10, 10A Recording medium 12 Base material 13 Low temperature color development layer 14 First spacer layer 15 Medium temperature color development layer 16 Second spacer layer 17 High temperature color development layer 18 Protective layer 21 to 23 Color development area 30 Laser spot 50 Recorded image data 51 Recording pixel 52 Non Recording pixels 53 to 57 Sub-recording area 100 Laser recording device 101 Recording stage 102 Laser head unit 102A Spot control unit 103 Drive unit 104 Control unit 191 Peeling layer 192 Light / heat conversion layer CT1-CT3 Scanning count LB Laser light PDh, PDl, PDm power density Pf1 to PfX end point Ps1 to PsX start point SPT spot SPh, SPl, SPm spot diameter Th third threshold temperature Tl first threshold temperature Tm second threshold temperature Ttem cycle Ve laser scanning speed Vtem laser scanning speed th, tl , Tm Recording time V1 to V3 Scanning speed WT1 to WT3 Waiting time

Claims (8)

Heat-sensitive materials having different color development threshold temperatures are included, and the heat-sensitive materials contained via an intermediate layer that insulates and transfers heat are laminated from the surface side irradiated with laser light so that the threshold temperature of the heat-sensitive material becomes high. A laser recording device that irradiates a recording medium provided with a plurality of heat-sensitive recording layers with the laser beam to perform recording.
The power density of the laser beam is relatively high during recording of the heat-sensitive recording layer having a high threshold temperature, and the laser beam has an effectively longer irradiation time during recording of the heat-sensitive recording layer having a low threshold temperature. When recording on the heat-sensitive recording layer to be recorded and recording by irradiating the same recording position with the laser beam a plurality of times, the recording area is divided into a plurality of sub-recording areas and the same. A laser recording apparatus including a control unit that controls so that the irradiation cycles of the laser light in each of the sub-recording areas of the heat-sensitive recording layer are the same . The control unit slows down the scanning speed of the laser beam at the same recording position as the heat-sensitive recording layer has a lower threshold temperature.
The laser recording apparatus according to claim 1. The control unit increases the number of times the laser beam is irradiated at the same recording position as the heat-sensitive recording layer has a lower threshold temperature.
The laser recording apparatus according to claim 1. The control unit lengthens the waiting time from the previous irradiation of the laser beam to the current irradiation at the same recording position as the thermal recording layer has a lower threshold temperature.
The laser recording apparatus according to claim 1. The control unit performs the recording for each of the thermal recording layers.
The laser recording apparatus according to any one of claims 1 to 4. Heat-sensitive materials having different color development threshold temperatures are included, and the heat-sensitive materials contained via an intermediate layer that insulates and transfers heat are laminated from the surface side irradiated with laser light so that the threshold temperature of the heat-sensitive material becomes high. A laser recording device that irradiates a recording medium provided with a plurality of heat-sensitive recording layers with the laser beam to perform recording.
When recording by irradiating the same recording position of the plurality of laminated heat-sensitive recording layers with the laser beam to simultaneously develop colors of the plurality of heat-sensitive recording layers to be colored , a plurality of sub recording areas are used. A laser recording apparatus including a control unit that is divided into recording areas and controls so that the irradiation cycles of the laser light in each of the sub-recording areas of the same thermal recording layer are the same . The control unit controls the laser beam so as to develop a color of the plurality of the heat-sensitive recording layers laminated in close proximity to each other or the plurality of the heat-sensitive recording layers laminated via the other heat-sensitive recording layers.
The laser recording apparatus according to claim 6. The control unit controls the power density, irradiation time, and irradiation cycle of the laser beam to simultaneously and simultaneously develop a plurality of heat-sensitive recording layers to be colored.
The laser recording apparatus according to claim 6 or 7.

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