JP7397414B2 - Combination of thermal transfer sheets - Google Patents

Description

The present invention relates to a combination of thermal transfer sheets.

2. Description of the Related Art Conventionally, there has been known a sublimation transfer method for producing prints using a thermal transfer sheet provided with a dye layer containing a sublimable dye. The sublimation transfer method has the advantage of smooth gradation expression, but the dye layer that makes up the thermal transfer sheet used is of three colors: Y (yellow), M (magenta), and C (cyan). In many cases (see, for example, Patent Document 1), a full-color image is formed using these three colors, resulting in poor color reproducibility.

In order to improve color reproducibility in the sublimation transfer method, it is conceivable to use a thermal transfer sheet having a dye layer of a color other than the above-mentioned YMC, but in this case, repeated transfers to the receiving layer on the side of the transfer object are possible. As a result, there is concern that thermal damage will accumulate, leading to fusion between the thermal transfer sheet and the receptor layer, and a decrease in density. Furthermore, as the number of dye layers increases, a new problem arises in that image formation takes a correspondingly longer time.

Japanese Patent Application Publication No. 2008-087309

The present invention was made under these circumstances, and its main object is to provide a combination of thermal transfer sheets used in the production of prints that takes advantage of the sublimation transfer method, which provides smooth gradation expression.

The present invention to solve the above-mentioned problems is a method for manufacturing a printed matter, which includes a step of preparing a transfer target, a thermal transfer sheet for the transfer target, an intermediate transfer medium, and a thermal transfer sheet for the intermediate transfer medium. forming a first image on the intermediate transfer medium using the thermal transfer sheet for intermediate transfer medium; and forming a first image on the intermediate transfer medium using the thermal transfer sheet for intermediate transfer medium. The method includes the steps of forming a second image by reversing the image, and transferring the second image on the intermediate transfer medium onto the first image on the transfer target. do.

In the invention, the thermal transfer sheet for the transfer object has a yellow dye layer containing yellow dye Y1, a magenta dye layer containing magenta dye M1, and a cyan dye layer containing cyan dye C1, and the intermediate transfer The thermal transfer sheet for media has a yellow dye layer containing yellow dye Y2, a magenta dye layer containing magenta dye M2, and a cyan dye layer containing cyan dye C2, and has a maximum absorption wavelength of yellow dye Y1 and a yellow dye Y2. have different maximum absorption wavelengths, the maximum absorption wavelength of the magenta dye M1 and the magenta dye M2 are different, and the maximum absorption wavelength of the cyan dye C1 and the maximum absorption wavelength of the cyan dye C2 are different. You can leave it there.

On the other hand, in the invention, the thermal transfer sheet for a transfer object has a yellow dye layer containing yellow dye Y1, a magenta dye layer containing magenta dye M1, and a cyan dye layer containing cyan dye C1. , the thermal transfer sheet for intermediate transfer medium has a yellow dye layer containing yellow dye Y2, a magenta dye layer containing magenta dye M2, and a cyan dye layer containing cyan dye C2, and has a maximum absorption wavelength of yellow dye Y1 and a cyan dye layer containing cyan dye C2. The maximum absorption wavelength of the yellow dye Y2 is the same, the maximum absorption wavelength of the magenta dye M1 is the same as the maximum absorption wavelength of the magenta dye M2, and the maximum absorption wavelength of the cyan dye C1 is the same as the maximum absorption wavelength of the cyan dye C2. The absorption wavelengths may be the same.

Furthermore, in the invention, the maximum absorption wavelengths of the yellow dyes Y1 and Y2 are both in the range of 400 nm to 500 nm, and the maximum absorption wavelengths of the magenta dyes M1 and M2 are both in the range of 500 nm to 600 nm. The maximum absorption wavelengths of the cyan dyes C1 and C2 are both within the range of 600 nm or more and 700 nm or less, and the maximum absorption wavelengths of the yellow dye Y1, magenta dye M1, and cyan dye C1 are each within the following range. are separated from each other by 80 nm or more, and the maximum absorption wavelength of the yellow dye Y2 is between the maximum absorption wavelength of the yellow dye Y1 and the maximum absorption wavelength of the magenta dye M1, and is separated from each other by 30 nm or more, and The maximum absorption wavelength of the magenta dye M2 is between the maximum absorption wavelength of the magenta dye M1 and the maximum absorption wavelength of the cyan dye C1, and is separated from each other by 30 nm or more, and the maximum absorption wavelength of the cyan dye C2 is: The wavelength may be longer than the maximum absorption wavelength of the cyan dye C1, and may be within a range of 30 nm or more and 100 nm or less from the maximum absorption wavelength of the cyan dye C1.

Another aspect of the present invention for solving the above problems includes a first thermal transfer sheet having a yellow dye layer containing a yellow dye Y1, a magenta dye layer containing a magenta dye M1, and a cyan dye layer containing a cyan dye C1; a second thermal transfer sheet having a yellow dye layer containing dye Y2, a magenta dye layer containing magenta dye M2, and a cyan dye layer containing cyan dye C2, the combination comprising: a second thermal transfer sheet having a yellow dye layer containing dye Y2, a magenta dye layer containing magenta dye M2, and a cyan dye layer containing cyan dye C2; Both wavelengths are in the range of 400 nm or more and 500 nm or less, the maximum absorption wavelengths of the magenta dyes M1 and M2 are both in the range of 500 nm or more and 600 nm or less, and the maximum absorption wavelengths of the cyan dyes C1 and C2 are , both are within the range of 600 nm or more and 700 nm or less, the maximum absorption wavelengths of the yellow dye Y1, magenta dye M1, and cyan dye C1 are separated from each other by 80 nm or more, and the maximum absorption wavelength of the yellow dye Y2 is The maximum absorption wavelength of the yellow dye Y1 is between the maximum absorption wavelength of the magenta dye M1 and is separated from each other by 30 nm or more, and the maximum absorption wavelength of the magenta dye M2 is the maximum absorption wavelength of the magenta dye M1. The maximum absorption wavelength of the cyan dye C1 is between the maximum absorption wavelengths of the cyan dye C1 and is separated from each other by 30 nm or more, and the maximum absorption wavelength of the cyan dye C2 is on the longer wavelength side than the maximum absorption wavelength of the cyan dye C1. It is characterized by being within a range of 30 nm or more and 100 nm or less from the maximum absorption wavelength of the cyan dye C1.

According to the method for manufacturing a print of the present invention, since a sublimation transfer method is adopted, a high-quality print with smooth gradation expression and excellent color reproducibility can be manufactured. Furthermore, similar effects can be achieved by using a combination of thermal transfer sheets of the present invention.

FIG. 1 is a configuration diagram of an apparatus for carrying out a method for manufacturing a print according to an embodiment of the present invention. It is a graph showing an example of spectral density for each wavelength of the first image P1. It is a graph showing an example of spectral density for each wavelength of the second image P2. It is a graph showing an example of the spectral density for each wavelength of a print P formed by superimposing a first image P1 and a second image P2. It is a graph showing an example of the spectral density for each wavelength of a print P formed by superimposing a first image P1 and a second image P2. It is a schematic sectional view of an example of the thermal transfer sheet for transfer targets.

1. Method for manufacturing a print The method for manufacturing a print according to an embodiment of the present invention will be described in detail below.

FIG. 1 is a configuration diagram of an apparatus for carrying out a method for manufacturing a print according to an embodiment of the present invention. Note that the apparatus shown in FIG. 1 is an example of an apparatus for carrying out the method of manufacturing a print according to an embodiment of the present invention, and the present invention is not limited to this apparatus.

1-1. Preparation Step As shown in the configuration diagram of the apparatus 100 shown in FIG. 1, in the method for manufacturing a print according to the present embodiment, a transfer object 10, a thermal transfer sheet 20 for the transfer object, an intermediate transfer medium 30, A step of preparing a thermal transfer sheet 40 for intermediate transfer medium is performed.

There are no particular limitations on the specific configurations of the transfer target 10, the transfer target thermal transfer sheet 20, the intermediate transfer medium 30, and the intermediate transfer medium thermal transfer sheet 40 prepared in this step. Note that an example of each specific configuration will be described later.

1-2. First Image Forming Step Next, as shown in the configuration diagram of the apparatus 100 shown in FIG. Above, a step of forming a first image P1 is performed using the thermal head H1 and the thermal transfer sheet 20 for the transferred object.

FIG. 2 is a graph showing an example of spectral density for each wavelength of the first image P1.

For example, the thermal transfer sheet 20 for the transfer object is provided with a yellow dye layer containing yellow dye Y1, a magenta dye layer containing magenta dye M1, and a cyan dye layer containing cyan dye C1. An example of the spectral density for each wavelength of the first image P1 when a solid black first image P1 is formed is shown in FIG. In order to make the explanation easier to understand, an example is given in which the first image P1 is solid black; however, the first image P1 is not limited to this, and the first image P1 is not limited to this. This is an image formed on a printed matter P using yellow dye Y1, magenta dye M1, and cyan dye C1 on the thermal transfer sheet 20 for a transfer object, based on a preset color table.

The measurement of the spectral density for each wavelength of the first image P1 is not particularly limited, and can be performed using a commercially available spectral densitometer. The spectral densities in FIG. 2 and FIGS. 3 and 4 shown below were measured using i1i02 (X-rite spectral densitometer).

1-3. Second Image Forming Step On the other hand, as shown in the configuration diagram of the apparatus 100 shown in FIG. 1, in the method for manufacturing a print according to the present embodiment, the intermediate transfer medium A step of forming a second image P2, which is an inversion of the first image P1, on the thermal transfer sheet 30 using the thermal head H2 and the intermediate transfer medium thermal transfer sheet 40 is performed.

FIG. 3 is a graph showing an example of spectral density for each wavelength of the second image P2.

Here, for example, the thermal transfer sheet 40 for intermediate transfer medium is provided with a yellow dye layer containing yellow dye Y2, a magenta dye layer containing magenta dye M2, and a cyan dye layer containing cyan dye C2. FIG. 3 shows an example of the spectral density of each wavelength of the second image P2 when a solid black second image P2 is formed using the layer. Note that, like the first image P1, the second image P2 is also exemplified as solid black to make the explanation easier to understand, but the second image P2 is not limited to this. Rather, it is a reversed image of the print P to be finally produced, and based on a preset color table, the yellow dye Y2, magenta dye M2, and cyan dye C2 in the thermal transfer sheet 40 for intermediate transfer medium are This is an image formed by

1-4. Transfer (Overlay) Step Next, as shown in the configuration diagram of the apparatus 100 shown in FIG. A step of transferring the second image P2 above onto the first image P1 on the transfer object 10 is performed, and a desired print P is formed.

FIG. 4 is a graph showing an example of the spectral density for each wavelength of a print P formed by superimposing the first image P1 and the second image.

FIG. 4 shows an example of the spectral density for each wavelength of a print formed by the method for manufacturing a print according to the present embodiment. As shown in FIG. 4, according to the method for manufacturing a print according to the present embodiment, the first image P1 formed on the transfer target 10 by the transfer target thermal transfer sheet 20 and the intermediate transfer medium thermal transfer Since the print P is formed by superimposing the second image P2 formed on the intermediate transfer medium 30 by the sheet 40, the spectral density for each wavelength of the print P is naturally the same as that of the first image P1. The spectral density of the second image P2 (FIG. 2) and the spectral density of the second image P2 (FIG. 3) are superimposed. Therefore, as shown in FIGS. 2 and 3, the Y1 dye, M1 dye, and C1 dye contained in the respective dye layers of each color (Y, M, C) in the thermal transfer sheet 20 for the transfer medium, and the thermal transfer medium for the intermediate transfer medium. By varying the maximum absorption wavelengths of the Y2 dye, M2 dye, and C2 dye contained in the respective dye layers of each color (Y, M, C) in the sheet 40, the thermal transfer sheet 20 for the transfer object or for the intermediate transfer medium can be used. It is possible to fill in the valleys in the spectral density of each color that occur when forming only with the thermal transfer sheet 40, and it is possible to significantly improve color reproducibility.

According to the above example, the finally formed print P will contain dyes of six colors: yellow dyes Y1 and Y2, magenta dyes M1 and M2, and cyan dyes C1 and C2. . In transferring the six colors, it is also possible to form six dye layers each containing the dyes of the six colors on a thermal transfer sheet for a transfer object, and to form a print using this thermal transfer sheet for a transfer object. However, in this case, heat damage from the thermal head will be applied to the transferred object six times, and problems such as fusion may occur. It is also possible to provide dye layers of the six colors on a thermal transfer sheet for an intermediate transfer medium and transfer the dye layer to a transfer object using the intermediate transfer medium, but in this case, it is possible to transfer the dye layers from the intermediate transfer medium six times. Re-transfer to the transfer object will be performed, and the completed print will have a six-layer structure, with a large gap between the first layer and the sixth layer, which may cause the image to become blurred. In order to avoid blurring of the image, it may be possible to transfer six colors to the receiving layer of one intermediate transfer medium, but in this case, the problem of catalyst fading may occur. Furthermore, a yellow dye layer containing both yellow dyes Y1 and Y2, a magenta dye layer containing both magenta dyes M1 and M2, and a cyan dye layer containing both cyan dyes C1 and C2 are added to the thermal transfer sheet for the transfer target. It is also possible to form prints using this thermal transfer sheet for transfer objects, but in this case, the amount of each of the two dyes contained in each dye layer can be adjusted independently depending on the amount of heat during transfer. Since adjustment is not possible, even if the valley between the maximum absorption wavelengths of each dye can be filled, the color reproducibility will not be good. On the other hand, according to the method for forming a printed matter according to the present embodiment, in forming the desired printed matter P, as described above, the first image P1 formed directly on the transfer target 10 and the first image P1 formed directly on the transfer target 10 are transferred via the intermediate transfer medium 30. Since the image is divided into two images P2 and a second image P2, which is formed by Since it is possible to use dyes having the following properties, color reproducibility can be improved by adjusting the amount of each dye separately and independently depending on the amount of heat during transfer.

Here, in the above example, the dyes (Y1, M1, and C1) contained in each color dye layer provided in the thermal transfer sheet 20 for a transfer target and the dyes (Y1, M1, and C1) provided in the thermal transfer sheet 40 for an intermediate transfer medium are used. Although the dyes (Y2, M2, and C2) contained in each color dye layer were different from each other, in the method of forming a printed matter according to this embodiment, they do not necessarily have to be different, and the same dye layers are different from each other. Dyes may be used, ie, Y1=Y2, M1=M2, and C1=C2.

Even in this case, in the method for manufacturing a print according to the present embodiment, the first image P1 formed on the transfer object 10 by the transfer object thermal transfer sheet 20 and the intermediate transfer medium thermal transfer sheet 40 Thus, the second image P2 formed on the intermediate transfer medium 30 is superimposed to form a print P.

FIG. 5 is a graph showing an example of the spectral density for each wavelength of a print P formed by superimposing the first image P1 and the second image.

Here, since the first image P1 and the second image P2 are images formed by dye layers containing the same dye, their spectral densities are as shown in FIG. 2, and the same images cannot be superimposed. The completed print P has a higher density, as shown in FIG.

As described above with reference to specific examples, according to the method for manufacturing a print according to the present embodiment, the first image is formed directly on the transfer target, and the first image is In order to form a final printed matter by superimposing the image on the second image, the dye contained in the dye layer in the thermal transfer sheet for the transfer object used to form the first image, and the second image. The combination of dyes contained in the dye layers in the thermal transfer sheet for intermediate transfer media used to form images can be freely selected, and the amount of dye contained in each dye layer can be adjusted separately and independently. Therefore, it is possible to improve the color reproducibility and density of the final print by changing the selection method, so to speak, by combining them, and by adjusting the density of the image formed using each dye layer. becomes.

2. What is prepared in the method for manufacturing a print according to the present embodiment The following is a transfer object, a thermal transfer sheet for a transfer object, and an intermediate transfer medium prepared in the method for manufacturing a print according to the embodiment described above. , and the structure of the thermal transfer sheet for intermediate transfer medium will be explained.

2-1. Object to be transferred The object to be transferred prepared in the method for manufacturing a print according to the present embodiment is not particularly limited, and may be a conventionally known substrate used in a sublimation thermal transfer method, such as a card base material or a thermal transfer image-receiving sheet. A transfer body can be appropriately selected and used.

2-2. Thermal Transfer Sheet for Transferred Materials and Thermal Transfer Sheets for Intermediate Transfer Medium The structure of the thermal transfer sheet for transferred materials itself prepared in the method for producing printed matter according to the present embodiment is not particularly limited, and may be of the sublimation type. A conventionally known thermal transfer sheet used in a thermal transfer method can be appropriately selected and used.

Further, the structure of the thermal transfer sheet itself for an intermediate transfer medium prepared in the method for manufacturing a print according to the present embodiment is not particularly limited, and a conventionally known thermal transfer sheet used in a sublimation type thermal transfer method may be used as appropriate. It can be used selectively.

In other words, the difference between the thermal transfer sheet for a transfer object and the thermal transfer sheet for an intermediate transfer medium prepared in this embodiment is the difference in purpose, specifically, whether it is used for forming an image on a transfer object or for intermediate transfer. The difference lies in whether it is used to form an image on the medium, and there is no difference in the structure of the medium itself. Therefore, although a thermal transfer sheet for a transfer target will be described below, the present invention can also be applied to a thermal transfer sheet for an intermediate transfer medium.

FIG. 6 is a schematic cross-sectional view of an example of a thermal transfer sheet for an object to be transferred.

As shown in FIG. 6, the thermal transfer sheet 20 for transfer objects includes a base material 21, a dye layer 22 located on one surface of the base material 21, and a back layer located on the other surface of the base material 21. 23, and the dye layer 22 may have a structure in which a yellow dye layer 22Y, a magenta dye layer 22M, and a cyan dye layer 22C are arranged in plane sequential order.

The materials and thicknesses of the base material 21 and back layer 23 constituting the thermal transfer sheet 20 for transferred objects are not particularly limited, and the base material and back layer of conventionally known thermal transfer sheets may be appropriately selected. Just use it.

The dye layer 22 constituting the thermal transfer sheet 20 for an object to be transferred contains a sublimable dye and a binder.

The sublimable dye is not particularly limited and can be appropriately selected and used from conventionally known sublimable dyes, but one that has good characteristics as a printing material, for example, has sufficient color density, Those that do not discolor or fade due to light, heat, temperature, etc. are preferred, and include diarylmethane dyes, triarylmethane dyes, thiazole dyes, merocyanine dyes, pyrazolone dyes, methine dyes, indoaniline dyes, acetophenone azomethine, and pyrazoloazomethine. , azomethine dyes such as imidazoazomethine, imidazoazomethine, pyridone azomethine, xanthene dyes, oxazine dyes, cyanostyrene dyes such as dicyanostyrene and tricyanostyrene, thiazine dyes, azine dyes, acridine dyes, benzene azo Azo dyes such as pyridone azo, thiophene azo, isothiazo azo, pyrrole azo, pyrazole azo, imidazo azo, thiadiazole azo, triazole azo, and disazo, spiropyran dyes, indolino spiropyran dyes, fluoran dyes, rhodamine lactam dyes Examples include dyes, naphthoquinone dyes, anthraquinone dyes, and quinophthalone dyes. More specifically, red dyes such as Disperse Red 60, Disperse Violet 26, CeresRed 7B, Samaron Red F3BS, yellow dyes such as Disperse Yellow 231, PTY-52, Macrolex Yellow 6G, Solvent Blue 63, Waku Sorin Blue AP-FW, Holon Brilliant Blue SR, MS Blue 100, C. I. Examples include blue dyes such as Solvent Blue 22.

Examples of the binder resin for supporting the sublimable dye include cellulose resins such as ethyl cellulose resin, hydroxyethyl cellulose resin, ethyl hydroxy cellulose resin, methyl cellulose resin, and cellulose acetate resin, polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, and polyvinyl Examples include vinyl resins such as acetal and polyvinylpyrrolidone, acrylic resins such as poly(meth)acrylate and poly(meth)acrylamide, polyurethane, polyamide, and polyester. Among these, resins such as cellulose resins, vinyl resins, acrylic resins, polyurethanes, and polyesters are preferred in terms of heat resistance, dye migration properties, and the like.

The dye layer 22 may contain additives such as inorganic particles and organic particles. Examples of inorganic particles include carbon black, silica, alumina, titanium dioxide, molybdenum disulfide, etc., and examples of organic particles include polyethylene wax. Further, the dye layer 22 may contain a mold release agent. Examples of the mold release agent include silicone oil, phosphate ester, and fluorine-based materials. Furthermore, the dye layer 22 may contain various curing agents such as isocyanate, epoxy resin, and carbodiimide.

Here, in the method for manufacturing a print according to the present embodiment, the dye in the dye layer provided on the thermal transfer sheet for the transfer target and the dye layer provided on the thermal transfer sheet for the intermediate transfer medium are By considering the relationship between the dyes and their respective maximum absorption wavelengths, it is possible to improve color reproducibility and density when images formed by these two thermal transfer sheets are superimposed. Therefore, the relationship between the dyes contained in the dye layers of the thermal transfer sheet for a transfer object and the thermal transfer sheet for an intermediate transfer medium, or in other words, the combination, is important.

For example, a thermal transfer sheet for an intermediate transfer medium has a yellow dye layer containing a yellow dye Y1, a magenta dye layer containing a magenta dye M1, and a cyan dye layer containing a cyan dye C1, and a thermal transfer sheet for an intermediate transfer medium has a yellow dye layer containing a yellow dye Y1, a magenta dye layer containing a magenta dye M1, and a cyan dye layer containing a cyan dye C1. When a yellow dye layer containing dye Y2, a magenta dye layer containing magenta dye M2, and a cyan dye layer containing cyan dye C2 are provided, which of the yellow dyes Y1 and Y2 has the maximum absorption wavelength? The maximum absorption wavelengths of the magenta dyes M1 and M2 are both within the range of 500 nm to 600 nm, and the maximum absorption wavelengths of the cyan dyes C1 and C2 are both 600 nm. It is preferable that the maximum absorption wavelengths of the yellow dye Y1, the magenta dye M1, and the cyan dye C1 are separated from each other by 80 nm or more. Further, it is preferable that the maximum absorption wavelengths of the yellow dye Y2, magenta dye M2, and cyan dye C2 are also separated from each other by 80 nm or more. Furthermore, it is more preferable that the maximum absorption wavelengths of yellow dye Y1, yellow dye Y2, magenta dye M1, magenta dye M2, cyan dye C1, and cyan dye C2 are separated from each other by 30 nm or more.

Furthermore, the maximum absorption wavelength of the yellow dye Y2 is between the maximum absorption wavelength of the yellow dye Y1 and the maximum absorption wavelength of the magenta dye M1, and the maximum absorption wavelength of the magenta dye M2 is between the maximum absorption wavelength of the magenta dye M1. It is between the maximum absorption wavelength of the cyan dye C1 and the maximum absorption wavelength of the cyan dye C1, and is separated from each other by 30 nm or more, and the maximum absorption wavelength of the cyan dye C1 is on the longer wavelength side than the maximum absorption wavelength of the cyan dye C1. More preferably, the wavelength is within a range of 30 nm or more and 100 nm or less from the maximum absorption wavelength of the cyan dye C1.

An example of a combination of yellow dyes Y1 and Y2 that satisfies the above relationship is a combination of Disperse Yellow 201 and a dye represented by the following structural formula (1).

Furthermore, examples of the combination of magenta dyes M1 and M2 that satisfy the above relationship include a combination of a dye represented by the following structural formula (2) and a dye represented by the following structural formula (3). I can do it.

Further, as a combination of cyan dyes C1 and C2 that satisfy the above relationship, for example, a combination of Disperse Blue 354 and a dye represented by the following structural formula (4) can be mentioned.

One of the above combinations of yellow dye, magenta dye, and cyan dye may be used in the dye layer of the thermal transfer sheet for the transfer target, and the other may be used in the dye layer of the thermal transfer sheet for the intermediate transfer medium. Moreover, the above-mentioned combinations are only examples, and it is also possible to use dyes other than these.

2-3. Intermediate Transfer Medium The intermediate transfer medium prepared in the method for manufacturing a print according to the present embodiment is not particularly limited, and any conventionally known intermediate transfer medium used in a sublimation thermal transfer method may be appropriately selected and used. I can do it. The intermediate transfer medium may have, for example, a structure in which a release layer, a primer layer, a protective layer, and a receptor layer are laminated in this order on one surface of a base material, and each of these layers is not particularly limited. It never happens.

10...Transfer object 20...Thermal transfer sheet for transfer object 30...Intermediate transfer medium 40...Thermal transfer sheet for intermediate transfer medium P1...First image P2...Second image P...Printed object 100...Printed object forming device

Claims (3)

a first thermal transfer sheet having a yellow dye layer containing yellow dye Y1, a magenta dye layer containing magenta dye M1, and a cyan dye layer containing cyan dye C1;
A second thermal transfer sheet having a yellow dye layer containing yellow dye Y2, a magenta dye layer containing magenta dye M2, and a cyan dye layer containing cyan dye C2,
The maximum absorption wavelengths of the yellow dyes Y1 and Y2 are both within the range of 400 nm or more and 500 nm or less,
The maximum absorption wavelengths of the magenta dyes M1 and M2 are both within the range of 500 nm or more and 600 nm or less,
The maximum absorption wavelengths of the cyan dyes C1 and C2 are both within the range of 600 nm or more and 700 nm or less,
The maximum absorption wavelengths of the yellow dye Y1, magenta dye M1, and cyan dye C1 are separated from each other by 80 nm or more,
The maximum absorption wavelength of the yellow dye Y2 is between the maximum absorption wavelength of the yellow dye Y1 and the maximum absorption wavelength of the magenta dye M1, and is separated from each other by 30 nm or more,
The maximum absorption wavelength of the magenta dye M2 is between the maximum absorption wavelength of the magenta dye M1 and the maximum absorption wavelength of the cyan dye C1, and is separated from each other by 30 nm or more,
The maximum absorption wavelength of the cyan dye C2 is on the longer wavelength side than the maximum absorption wavelength of the cyan dye C1, and is within a range of 30 nm or more and 100 nm or less from the maximum absorption wavelength of the cyan dye C1. A combination of a first thermal transfer sheet and a second thermal transfer sheet. a first thermal transfer sheet having a yellow dye layer containing yellow dye Y1, a magenta dye layer containing magenta dye M1, and a cyan dye layer containing cyan dye C1;
A second thermal transfer sheet having a yellow dye layer containing yellow dye Y2, a magenta dye layer containing magenta dye M2, and a cyan dye layer containing cyan dye C2,
The first thermal transfer sheet has a yellow dye layer containing yellow dye Y1, a magenta dye layer containing magenta dye M1, and a cyan dye layer containing cyan dye C1,
The second thermal transfer sheet has a yellow dye layer containing yellow dye Y2, a magenta dye layer containing magenta dye M2, and a cyan dye layer containing cyan dye C2,
The maximum absorption wavelength of the yellow dye Y1 and the maximum absorption wavelength of the yellow dye Y2 are different,
The maximum absorption wavelength of the magenta dye M1 and the maximum absorption wavelength of the magenta dye M2 are different,
A combination of a first thermal transfer sheet and a second thermal transfer sheet, characterized in that the maximum absorption wavelength of the cyan dye C1 and the maximum absorption wavelength of the cyan dye C2 are different. a first thermal transfer sheet having a yellow dye layer containing yellow dye Y1, a magenta dye layer containing magenta dye M1, and a cyan dye layer containing cyan dye C1;
A second thermal transfer sheet having a yellow dye layer containing yellow dye Y2, a magenta dye layer containing magenta dye M2, and a cyan dye layer containing cyan dye C2,
The first thermal transfer sheet has a yellow dye layer containing yellow dye Y1, a magenta dye layer containing magenta dye M1, and a cyan dye layer containing cyan dye C1,
The second thermal transfer sheet has a yellow dye layer containing yellow dye Y2, a magenta dye layer containing magenta dye M2, and a cyan dye layer containing cyan dye C2,
The maximum absorption wavelength of the yellow dye Y1 and the maximum absorption wavelength of the yellow dye Y2 are the same,
The maximum absorption wavelength of the magenta dye M1 and the maximum absorption wavelength of the magenta dye M2 are the same,
The maximum absorption wavelength of the cyan dye C1 and the maximum absorption wavelength of the cyan dye C2 are the same,
The amount of the yellow dye Y1 contained in the yellow dye layer of the first thermal transfer sheet is different from the amount of the yellow dye Y2 contained in the yellow dye layer of the second thermal transfer sheet,
The amount of the magenta dye M1 contained in the magenta dye layer of the first thermal transfer sheet is different from the amount of the dye M2 contained in the magenta dye layer of the second thermal transfer sheet,
The amount of the cyan dye C1 contained in the cyan dye layer of the first thermal transfer sheet and the amount of the cyan dye C2 contained in the cyan dye layer of the second thermal transfer sheet are different. A combination of a thermal transfer sheet and a second thermal transfer sheet.

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