JP2005007692A - Thermal transfer ink ribbon, printed matter for authentication, and method for forming image for printed matter for authentication - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal transfer ink ribbon for making printed matter with a high security in which it is not easily recognized that a fluorescent image is printed, the printed matter for authentication on which the fluorescent image is printed by using the ink ribbon, and a method for inspecting the printed matter for authentication. <P>SOLUTION: The thermal transfer ink ribbon R1 provided with a belt-like substrate 1 for the thermal transfer ink ribbon, the first ink layer 21 comprising a fluorescent coloring material 3 emitting the first visible light excited by the first exciting light in the longitudinal direction of the belt-like substrate of this thermal transfer ink ribbon, and the second ink layer 22 comprising a fluorescent coloring material 4 emitting the second visible light excited by the first or the second exciting light, is formed. In addition, the printed matter for authentication is recorded with the first fluorescent image by the first ink layer 21 and the second fluorescent image by the second ink layer 22 of this thermal transfer ink ribbon R1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is, for example, an authentication card that requires countermeasures against forgery or alteration, a thermal transfer ink ribbon for printing a fluorescent image on an authentication printed matter such as a passbook, an authentication printed matter, and an image formation of the authentication printed matter. Regarding the method.
[0002]
[Prior art]
For example, printed materials for authentication such as credit cards, driver's licenses, employee's cards, and entry / exit permits for entry / exit, such as cards for personal authentication and passbooks, are printed materials that require high security. The person's face photo is printed or affixed to authenticate the person. However, since the technology of color copiers and color printers has advanced greatly in recent years, crimes that exploit this to create counterfeits and altered products have become a social problem.
[0003]
Various proposals have been made to prevent these counterfeits and alterations (for example, see Patent Document 1). In Patent Document 1, red (hereinafter referred to as R), green (hereinafter referred to as G), and blue (hereinafter referred to as B) light excited by light in a wavelength region other than visible light. An original image is printed on a substrate using three types of fluorescent inks that emit light. The printed phosphor image is irradiated with black light containing excitation light, and R, G, B light is emitted from the phosphor image, and the original image is formed by additive mixing of the emitted light. An image forming method has been proposed in which a close fluorescent image appears.
[0004]
In the image forming method, the spectral wavelength distributions of excitation light that emits R, G, and B light are at least partially overlapped. The reason for this is that the excitation light from the UV-A type black light source with one kind of ultraviolet light (UV) containing a large amount of light in the overlapping portion is excited to emit R, G and B, and the fluorescent image is efficiently obtained. This is to make it visible.
[0005]
[Patent Document 1]
JP 10-35089 A (first page)
[0006]
[Problems to be solved by the invention]
The black light used in the conventional image forming method disclosed in Patent Document 1 is commercially available as a UV-A type light source, and can be easily obtained by anyone. It can be easily known that a phosphor image (hereinafter referred to as a fluorescent image) is printed on the printed matter. As described above, there is a problem that security is reduced when it is easily recognized that the fluorescent image is printed.
[0007]
The present invention has been made to solve the above-mentioned problems, and when printing a fluorescent image on a print for authentication, the thermal transfer ink for recording a high-security image in which the printing of the fluorescent image is not easily visible It is an object of the present invention to provide a ribbon, an authentication printed matter recorded using the thermal transfer ink ribbon, and an image forming method for the authentication printed matter.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a thermal transfer ink ribbon according to claim 1 comprises a belt-like support for the thermal transfer ink ribbon and a first ink layer containing a first fluorescent colorant in the length direction of the support. And a second ink layer containing a second fluorescent colorant in the length direction of the support, wherein the first and second ink layers are alternately formed on one surface of the support. It is characterized by being.
[0009]
The printed matter for authentication according to claim 6 contains a first ink layer containing a first fluorescent colorant and a second fluorescent colorant in the length direction of the belt-like support of the thermal transfer ink ribbon. A printed matter for authentication recorded using a thermal transfer ink ribbon in which the first and second ink layers are alternately formed on one surface of the support. The first fluorescent image recorded with the first ink layer and the second fluorescent image recorded with the second ink layer are provided at predetermined positions.
[0010]
Furthermore, in the image forming method of the printed matter for authentication according to claim 10, the first visible light that emits the first visible light when excited by the first excitation light in the length direction of the belt-like support of the thermal transfer ink ribbon. A first ink layer containing a fluorescent colorant and a second ink layer containing a second fluorescent colorant that emits second visible light when excited by the first or second excitation light. An image forming method of a printed matter for authentication using a thermal transfer ink ribbon in which the first and second ink layers are alternately formed on one surface of the support,
A reading step for reading image information, a creation step for creating recording data for recording on an authentication print from the image information read in the reading step, and the authentication for the recording data created in the recording data creation step. And a recording step of recording a first fluorescent image by the first ink layer of the thermal transfer ink ribbon and a second fluorescent image by the second ink layer at a predetermined position of the printed material for printing. And
[0011]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
First, a first embodiment of a thermal transfer ink ribbon according to the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of the thermal transfer ink ribbon R1 of the present invention. The thermal transfer ink ribbon R1 includes a belt-like support 1 and a first ink layer 21 formed of a heat-meltable binder 5a in which a fluorescent colorant 3 is dispersed and contained on one surface of the support 1. A second layer formed of a heat-meltable binder 5b that is disposed adjacent to the same surface of the support 1 where the first ink layer 21 is formed and contains the fluorescent colorant 4 dispersedly. The first ink layer 21 and the second ink layer 22 are sequentially and repeatedly applied in the length direction of the support 1.
[0012]
The support 1 is made of a synthetic resin film such as polyester or polyimide having a thickness of 2 to 6 μm, for example.
[0013]
The 1st ink layer 21 and the 2nd ink layer 22 disperse | distribute the fluorescent color materials 3 and 4 light-emitted by irradiating excitation light to the heat-meltable binder 5a, 5b, and are 2-4 micrometers thick compositions. It consists of
[0014]
Furthermore, the heat-meltable binders 5a and 5b are made of heat-meltable, colorless and transparent or monochromatic transparent materials such as microcrystalline wax, higher fatty acid, higher fatty acid ester, vinyl chloride-vinyl acetate copolymer, and saturated polyester resin. Those having a melting point of 6 ° C to 100 ° C are preferably used.
[0015]
For fluorescent colorants such as fluorescent colorant 3 and fluorescent colorant 4, inorganic fluorescent pigments, organic fluorescent pigments, and wavelength conversion colorants are used.
[0016]
Inorganic fluorescent pigments are composed of oxides such as Ca, Ba, Mg, Zn, and Cd, sulfides, silicates, and the like, and metal elements such as Mn, Zn, Ag, and Cu, or lanthanoids. A pigment obtained by adding an activator containing a rare earth element and baking is used.
[0017]
As the organic fluorescent pigment, a diaminostilbene disulfonic acid derivative, an imidazole derivative, a coumarin derivative, or a fluorescein dye is used.
[0018]
As the wavelength conversion colorant, a rhodamine fluorescent pigment or the like is used.
[0019]
These inorganic fluorescent pigments and organic fluorescent pigments are excited mainly by ultraviolet light and emit visible light. The wavelength conversion colorant emits visible light when excited by visible light.
[0020]
Here, the composition of the fluorescent colorant will be described. The fluorescent colorant 3 of the thermal transfer ink ribbon R1 shown in FIG. 1 is composed of, for example, a fluorescent pigment (composition formula Y ₂ O ₃ : Eu) that emits red light when excited with excitation light having a wavelength of 254 nm. The first ink layer 21 is obtained by dispersing the fluorescent pigment in a hot-melt binder 5a (for example, microcrystalline wax), applying it to the surface of the support 1 by gravure printing (not shown), and drying the ink layer. 21 is formed.
[0021]
The fluorescent colorant 4 is made of a fluorescent pigment (composition formula Sr ₅ (PO ₂ ) ₃ Cl: Eu) that emits blue light when excited with excitation light having a wavelength of 365 nm or 254 nm, for example. The second ink layer 22 contains the fluorescent pigment dispersed in a hot-melt binder 5b (for example, microcrystalline wax), applied to the surface of the support 1 by gravure printing, and dried to dry the ink layer 22. Is formed.
[0022]
The thermal transfer ink ribbon R1 is formed by alternately arranging the first ink layer 21 and the second ink layer 22 on one surface of the support 1.
[0023]
FIG. 2 is a diagram illustrating a relationship between excitation light and light emission of the thermal transfer ink ribbon R1. The fluorescent colorant 3 of the first ink layer 21 emits red light 32 when excited by the excitation light 31 having a wavelength of 254 nm, and the fluorescent colorant 4 of the second ink layer 22 has a wavelength of 254 nm. It shows a state in which the blue light 34 is emitted even if it is excited by any one of the excitation light 31 or the excitation light 33 having a wavelength of 365 nm.
[0024]
Next, a method for forming the thermal transfer ink ribbon of the first embodiment will be described. In order to obtain a printed matter for authentication, visibility is required, and for example, it is necessary to form a color image such as a face image. For this purpose, a yellow pigment (hereinafter referred to as C), a magenta pigment (hereinafter referred to as M), and a cyan pigment (hereinafter referred to as C) are added to the thermal transfer ink ribbon described in FIGS. And a visible ink layer each containing a black pigment (hereinafter referred to as BK) are sequentially formed in the length direction of the thermal transfer ink ribbon.
[0025]
By printing the thermal transfer ink ribbon configured in this manner using, for example, an image forming method described later, color image printing and fluorescent image printing on a print for authentication can be performed.
[0026]
(Second Embodiment)
Next, the thermal transfer ink ribbon R2 according to the second embodiment of the present invention will be described.
[0027]
In addition, the same thing as what was used for 1st Embodiment demonstrated previously is attached | subjected and demonstrated with the same code | symbol.
[0028]
FIG. 3 is a side sectional view of the thermal transfer ink ribbon R2 of the present invention. The thermal transfer ink ribbon R2 includes a support 1 and an ink layer 23 that forms a heat-meltable binder 5c containing a fluorescent colorant 3 and a fluorescent colorant 4 on one surface of the support 1. .
[0029]
Since the composition material for forming the ink layer 23 and the method for forming the ink layer 23 are the same as those of the first ink layer 21 or the second ink layer 22 of the thermal transfer ink ribbon R1, description thereof will be omitted.
[0030]
The fluorescent colorant 3 is composed of a fluorescent pigment (composition formula Y ₂ O ₃ : Eu) that emits red light 32 when excited with excitation light 31 having a wavelength of 254 nm, for example, and the fluorescent colorant 4 is, for example, 365 nm. And a fluorescent pigment (composition formula Sr ₅ (PO ₂ ) ₃ Cl: Eu) that emits blue light 34 when excited by excitation light having a wavelength of 254 nm.
[0031]
The thermal transfer ink ribbon R2 contains these fluorescent colorants 3 and 4 dispersed in a hot-melt binder 5c (for example, microcrystalline wax), applied to one surface of the support 1 by gravure printing, and dried. Thus, the ink layer 23 is formed.
[0032]
FIG. 4 is a diagram showing the relationship between excitation light and light emission of the thermal transfer ink ribbon R2. That is, the fluorescent colorant 3 of the ink layer 23 emits red light 32 when excited by the excitation light 31 having a wavelength of 254 nm, and the fluorescent colorant 4 has an excitation light 31 having a wavelength of 254 nm or a wavelength of 365 nm. It shows a state in which blue light 34 is emitted when excited by the excitation light 33 having the following.
[0033]
By printing the thermal transfer ink ribbon R2 configured as described above using, for example, an image forming method to be described later, color image printing such as a face image on a print for authentication and fluorescent image printing can be performed.
[0034]
Next, an image forming method for forming an image such as a printed matter for authentication using the thermal transfer ink ribbon R1 or R2 of the present invention will be described with reference to FIGS.
[0035]
FIG. 5 is a flowchart for forming an image on a print for authentication using the thermal transfer ink ribbon of the present invention, and FIG. 6 is a recording operation processing subroutine. Note that the difference between the thermal transfer ink ribbon R1 and the thermal transfer ink ribbon R2 is only the difference in whether two ink layers are formed on the support 1 or one ink layer is formed. The image forming method using the thermal transfer ink ribbon R1 in which two ink layers are formed includes an image forming method using the thermal transfer ink ribbon R2 in which one ink layer is formed. Therefore, an image forming method for printing on a recording medium using the thermal transfer ink ribbon R1 will be mainly described.
[0036]
The flowchart of FIG. 5 is processed by a CPU (not disclosed) constituting a print control unit that controls the print unit.
[0037]
The first step is an image information reading process routine (S1). The image information described here is a pattern such as a human face or a pattern captured by a silver halide photograph or a digital camera. In this processing routine (S1), this image information is read as image data.
[0038]
The second step is a recording data creation processing routine (S2), which is a routine for creating recording data for recording from the read image data on the print for authentication. This recording data is recording data for recording on the authentication printed matter for each of the first ink layer 21 and the second ink layer 22 from the image data obtained in the first step.
[0039]
The third step is a recording operation processing subroutine (S3), and the detailed recording operation is shown in FIG. Hereinafter, the recording operation subroutine will be described with reference to the flowchart of FIG.
[0040]
The recording data created in the second step is transferred to the print control unit. In the printing unit, the above-described thermal transfer ink ribbon R1 is sandwiched between the thermal head for printing and the recording medium that is the printed matter for authentication. At this time, with respect to the thermal head, the recording surface of the recording medium and the ink layer forming surface on which the first ink layer 21 or the second ink layer 22 of the thermal transfer ink ribbon R1 are in contact with each other. Then, the thermal transfer ink ribbon R1 is pressed with a predetermined pressure from the other surface side of the support 1 (S10).
[0041]
Then, the print control unit conveys the recording medium and the thermal transfer ink ribbon R1 at a predetermined recording speed as the thermal head is driven based on the recording data created in the second step (S11), and the recording data Based on the above, the first ink layer 21 is transferred to the recording medium by the thermal head (S13), thereby recording an image.
[0042]
The recording at this time is recorded line by line in a direction perpendicular to the conveyance direction of the recording medium, and whether or not recording has been performed up to a predetermined number of lines is confirmed (S14). The number of lines is set when recording data is created.
[0043]
Next, it is confirmed whether or not the number of times of recording has reached a predetermined value (S15). The thermal transfer ink ribbon R1 has two ink layers, and it is necessary to record an image in the case of the first ink layer 21 and the second ink layer 22, and the number of times of recording is two.
[0044]
The thermal transfer ink ribbon R1 needs to record an image of the second ink layer 22, and performs the processes of S11 to S14 again in the same manner as the image recording by the first ink layer 21.
[0045]
Next, the conveyance of the recording medium and the thermal transfer ink ribbon R1 is stopped (S16), and the pressing force is applied so that the recording surface of the recording medium, the ink layer forming surface of the thermal transfer ink ribbon R1, and the thermal head come into contact with each other. Is released to separate the recording surface and the thermal transfer ink ribbon R1 (S17). In this state, the transfer operation to the recording medium by the first ink layer 21 and the second ink layer 22 of the thermal transfer ink ribbon R1 is completed.
[0046]
Next, a printed matter for authentication in which a fluorescent image is printed using the thermal transfer ink ribbon R1 or the thermal transfer ink ribbon R2 of the present invention will be described with reference to FIGS.
[0047]
FIG. 7 is a diagram showing a first example of the authentication printed matter created according to the present invention. FIG. 7 shows a state where the square pattern 12 and the background face image 13 are printed on the recording medium 14 using the above-described procedure.
[0048]
That is, the recording medium 14 has a square pattern (first fluorescent image) 12 with the first ink layer 21 of the thermal transfer ink ribbon R1 and a face image with background (second fluorescent image) 13 with the second ink layer 22. Are recorded so as not to overlap each other. In this case, in the image forming flowchart of FIG. 5, the recording operation processing subroutine (S3) is performed twice according to the two types of image information.
[0049]
When the recording medium 14 produced in this way is irradiated with excitation light from the UV-A type black light source 10 having a wavelength of 365 nm, the rectangular pattern 12 recorded by the first ink layer 21 becomes the first pattern 12. Since the wavelength (254 nm) for exciting the fluorescent colorant 3 contained in the ink layer 21 is not irradiated, it does not emit light and cannot be viewed. On the other hand, the background face image 13 recorded by the second ink layer 22 is irradiated with a wavelength (365 nm) that excites the fluorescent colorant 4 contained in the second ink layer 22, and therefore emits blue light. The person who inspects can visually recognize. FIG. 7A shows this state.
[0050]
On the other hand, FIG. 7B shows a state in which the recording medium 14 is irradiated with the light source 11 that emits excitation light of 254 nm. In this case, both the fluorescent colorant 3 included in the first ink layer 21 and the fluorescent colorant 4 included in the second ink layer 22 are excited at a wavelength of 254 nm. The square pattern 12 recorded with the ink layer 21 emits red light, and the background face image 13 recorded with the second ink layer 22 emits blue light so that the person inspecting can view it.
[0051]
As described above, according to the present invention, the fluorescent image that is not visually recognized when the recording medium 14 is irradiated with the light source 10 that irradiates the UV-A type black light having the wavelength of 365 nm is the light having the wavelength of 254 nm. When the excitation light of the light source 11 that irradiates is irradiated, it becomes visible and the recording medium 14 with high security can be obtained. Further, the authenticity of the printed matter can be determined by emitting the presence of the rectangular pattern 12 recorded by the first ink layer 21 by irradiating it with excitation light having a wavelength of 254 nm.
[0052]
FIG. 8 is a diagram showing a second example of the printed matter for authentication created according to the present invention. In the description of the second example, the same parts as those in the first example are denoted by the same reference numerals, and the description thereof is omitted. FIG. 8A shows a state in which the recording medium 15 on which an image has been formed is irradiated with excitation light using a UV-A type light source 10 that emits excitation light having a wavelength of 365 nm using the thermal transfer ink ribbon R1. Is shown.
[0053]
In the recording medium 15 according to the second example, a part of the background face image 13 recorded with the second ink layer 22 overlaps the rectangular pattern 12 recorded with the first ink layer 21 of the thermal transfer ink ribbon R1. Is recorded. Also in this case, in the image forming flowchart of FIG. 5, the recording operation processing subroutine (S3) is performed twice in accordance with two types of image information.
[0054]
When the recording medium 15 thus prepared is irradiated with excitation light using a UV-A type light source 10 that emits excitation light having a wavelength of 365 nm, the rectangular pattern 12 recorded by the first ink layer 21 is obtained. Since the wavelength (254 nm) for exciting the fluorescent colorant 3 contained in the first ink layer 21 is not irradiated, it does not emit light and the person who inspects cannot visually recognize it. On the other hand, the background face image 13 recorded by the second ink layer 22 emits blue light because it is irradiated with excitation light having a wavelength (365 nm) that excites the fluorescent colorant 4 contained in the second ink layer 22. Therefore, the person who inspects can visually recognize.
[0055]
On the other hand, FIG. 8B shows a state in which the recording medium 15 is irradiated with the light source 11 that emits excitation light of 254 nm. In this case, both the fluorescent colorant 3 included in the first ink layer 21 and the fluorescent colorant 4 included in the second ink layer 22 are excited by excitation light having a wavelength of 254 nm. The square pattern 12 recorded with the ink layer 21 emits red light, and the background face image 13 recorded with the second ink layer 22 emits blue light. Further, the overlapping portion 20 of the square pattern 12 and the background face image 13 emits magenta light that is a mixed color of red light and blue light.
[0056]
As described above, since the presence of the square pattern 12 recorded by the first ink layer 21 can be confirmed by irradiating the excitation light using the light source 11 that emits the excitation light of 254 nm, the authenticity of the recording medium 15 can be determined. Can be used. In addition, since the portion 20 where the rectangular pattern 12 and the background face image 13 are overlapped and recorded emits magenta light, if the emission color of the overlapping portion 20 is defined, both images are forged. Even if it is done, the printed matter for authentication with higher security can be provided by measuring the emission of the prescribed emission color.
[0057]
FIG. 9 is a diagram showing a third example of the printed matter for authentication created according to the present invention. In the description of the third example, the same parts as those in the first and second examples are denoted by the same reference numerals, and the description thereof is omitted.
[0058]
In the recording medium 16 according to the third example, the square pattern 12 recorded by the first ink layer 21 of the thermal transfer ink ribbon R1 and the background face image 13 recorded by the second ink layer 22 are overlapped at the same position. Recorded. Further, the background face image 13 may be recorded using the thermal transfer ink ribbon R2 containing the fluorescent colorants 3 and 4.
[0059]
When the recording medium 16 is irradiated with excitation light using a UV-A type light source 10 that emits excitation light having a wavelength of 365 nm, the second ink layer 22 is recorded when recording is performed using the thermal transfer ink ribbon R1. When the fluorescent color material 4 included in the recording medium is recorded using the thermal transfer ink ribbon R2, only the fluorescent color material 4 included in the ink layer 23 is excited, so that the face image with background 13 emits blue light. The person inspecting can visually check.
[0060]
Further, when the recording medium 16 is irradiated with excitation light using the light source 11 that emits excitation light of 254 nm, the red light contained in the rectangular pattern 12 recorded by the first ink layer 21 of the thermal transfer ink ribbon R1 is emitted. Both the fluorescent colorant 3 that emits light and the fluorescent colorant 4 that emits blue light included in the background face image 13 recorded by the second ink layer 22 emit light, and the background face on which the overlapping image appears. The image 13 emits magenta light. Further, in the background image recorded using the thermal transfer ink ribbon R2, the fluorescent color materials 3 and 4 included in the ink layer 23 are excited, and the background image 13 emits magenta light. Thereby, the person who test | inspects the face image 13 with a background can visually recognize.
[0061]
As described above, in the authentication printed matter of the third example, when the excitation light is irradiated by the UV-A type light source 10 that emits the excitation light having a wavelength of 365 nm, the face image 13 with the background is visible only by the emission of the blue light. However, it is possible to visually recognize magenta light emission by irradiating excitation light having a wavelength 11 of 254 nm, and security is improved. The authenticity of the printed matter can be determined by confirming that the light emission color of the background face image 13 is changed by the light source 11 that emits excitation light having a wavelength of 254 nm. Further, if the color of the face image 13 when the light source 11 that emits the excitation light having a wavelength of 254 nm is irradiated is defined in advance, even if both images are forged, the light emission of the defined emission color can be performed. By measuring the emission of the specified emission color by measuring, it is possible to provide a printed material with high security.
[0062]
【The invention's effect】
By using the thermal transfer ink ribbon of the present invention, it is possible to provide an authentication printed matter with high security in which a fluorescent image is not easily printed.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a thermal transfer ink ribbon R1 according to a first embodiment of the invention.
FIG. 2 is a diagram illustrating a relationship between excitation light and light emission of a thermal transfer ink ribbon R1 and a specific example of a thermal transfer ink ribbon.
FIG. 3 is a side sectional view of a thermal transfer ink ribbon R2 according to a second embodiment of the present invention.
FIG. 4 is a diagram illustrating a relationship between excitation light and light emission of the thermal transfer ink ribbon R2 and a specific example of the thermal transfer ink ribbon.
FIG. 5 is a flowchart for forming a fluorescent image on a print for authentication using the thermal transfer ink ribbon of the present invention.
6 is a flowchart of a recording operation processing subroutine of FIG.
FIG. 7 is a diagram showing a first example of an authentication printed material created according to the present invention.
FIG. 8 is a diagram showing a second example of the authentication printed matter created according to the present invention.
FIG. 9 is a diagram showing a third example of the authentication printed matter created according to the present invention.
[Explanation of symbols]
R1 Thermal transfer ink ribbon R2 Thermal transfer ink ribbon 1 Support 21 First ink layer 22 Second ink layer 23 Third ink layers 3 and 4, Fluorescent colorant 5 Hot melt binder 31 Excitation light 32 having a wavelength of 254 nm Red light 33 Excitation light 34 having a wavelength of 365 nm Blue light 10 UV-A type light source 11 having a wavelength of 365 nm Light source 12 having a wavelength of 254 nm Square pattern 13 Background image 14, 15, 16 with print 20 Printed part 20

Claims (11)

A belt-like support of a thermal transfer ink ribbon;
A first ink layer containing a first fluorescent colorant in the length direction of the support; and a second ink layer containing a second fluorescent colorant in the length direction of the support;
The thermal transfer ink ribbon, wherein the first and second ink layers are alternately formed on one surface of the support. A belt-like support of a thermal transfer ink ribbon;
An ink layer containing a first fluorescent colorant and a second fluorescent colorant in the length direction of the support;
The thermal transfer ink ribbon, wherein the ink layer is formed on one surface of the support. The first fluorescent colorant is composed of a fluorescent pigment that emits first visible light when excited by first excitation light,
The said 2nd fluorescent coloring material is comprised with the fluorescent pigment which light-emits 2nd visible light, when excited by the 1st or 2nd excitation light, The Claim 1 or Claim 2 characterized by the above-mentioned. Thermal transfer ink ribbon. 4. The thermal transfer ink ribbon according to claim 3, wherein the first excitation light has a wavelength of 254 nm and the second excitation light has a wavelength of 365 nm. 4. The thermal transfer ink ribbon according to claim 3, wherein the first visible light is red light and the second visible light is blue light. A first ink layer containing a first fluorescent colorant and a second ink layer containing a second fluorescent colorant are provided in the length direction of the belt-like support of the thermal transfer ink ribbon, And a printed matter for authentication recorded using a thermal transfer ink ribbon in which the second ink layer is alternately formed on one surface of the support,
A printed matter for authentication, comprising a first fluorescent image recorded with the first ink layer and a second fluorescent image recorded with the second ink layer at a predetermined position of the printed matter. The printed matter for authentication according to claim 6, wherein the first fluorescent image and the second fluorescent image are recorded so that part or all of the first fluorescent image and the second fluorescent image overlap each other. An ink layer containing a first fluorescent colorant and a second fluorescent colorant is provided in the length direction of the belt-like support of the thermal transfer ink ribbon, and the ink layer is formed on one surface of the support. Prints for authentication recorded using a thermal transfer ink ribbon,
A printed matter for authentication, wherein a fluorescent image having the ink layer is recorded at a predetermined position of the printed matter. The first fluorescent colorant is composed of a fluorescent pigment that emits first visible light when excited by first excitation light,
The said 2nd fluorescent color material is comprised with the fluorescent pigment which light-emits 2nd visible light, when excited by the 1st or 2nd excitation light, The Claim 6 or Claim 8 characterized by the above-mentioned. Printed material for authentication. A first ink layer containing a first fluorescent colorant that emits first visible light when excited by first excitation light in the length direction of the belt-like support of the thermal transfer ink ribbon; Or a second ink layer containing a second fluorescent colorant that emits second visible light when excited by the second excitation light, wherein the first and second ink layers are formed on the support. An image forming method of a printed matter for authentication using a thermal transfer ink ribbon formed alternately on one side,
A reading step for reading image information;
A creation step for creating recording data for recording on the authentication printed matter from the image information read in the reading step;
Recording the first fluorescent image by the first ink layer of the thermal transfer ink ribbon at a predetermined position of the print for authentication with the recording data created in the creating step;
And a recording step of recording a second fluorescent image with the second ink layer. When excited by the first excitation light in the length direction of the belt-like support of the thermal transfer ink ribbon, it is excited by the first fluorescent colorant that emits the first visible light and the first or second excitation light. Then, there is provided an ink layer containing a second fluorescent colorant that emits the second visible light, and the printed matter for authentication using the thermal transfer ink ribbon in which the ink layer is formed on one surface of the support. An image forming method comprising:
A reading step for reading image information;
A creation step for creating recording data for recording on the authentication printed matter from the image information read in the reading step;
And a recording step of recording a fluorescent image using the thermal transfer ink ribbon at a predetermined position of the authentication printed matter.

Images