JPH1035089A - Image formed body and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image formed body of a high security wherein truth or falsehood can be discriminated with a fluorescent image emitting light with a black light, and reproduction of the fluorescent image is very difficult, and its manufacture. SOLUTION: By using three kinds of fluorescent ink containing three kinds of color materials emitting light of R, G, B by being excited with light of a wavelength area other than that of visible light, R, G, B image data provided to a copy image or a subject arm printed on at leat a part of a substrate 1 to form fluorescent images 3-20. By irradiating with black light containing excitation light, R, G, B lights are emitted from the fluorescent image part 3-20, and the fluorescent image near the copy image is made to appear by mixing of the additive colors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming body, and more particularly to an image forming body which requires novelty in appearance and measures to prevent forgery or alteration by a color copier or the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In the field mainly of the so-called commercial printing field, such as posters, greeting cards, and point-of-sale displays, there is a demand for an image forming body which always has an eye catching effect and is rich in novelty. On the other hand, banknotes, gift certificates, credit cards, etc. are printed materials that require high security, but with the recent technological advances in color copiers, anyone can easily create fake products that are no different from genuine products. It is a social problem. As a countermeasure to prevent forgery by this color copying machine, by printing micro-characters (about 300 μm in size) finer than the scanning accuracy (400 DPI) of color copying, characters are not reproduced when copying. A method of judging authenticity, or a method of printing some image in advance with a transparent fluorescent ink that emits fluorescent light by irradiating light of a specific wavelength, and irradiating it with black light, for example, is a method of judging authenticity used. Have been. The invention of Japanese Patent Application No. 7-127410 filed by the present applicant proposes an anti-counterfeit print using a colored fluorescent ink which is out of the color reproduction range of a color copier. Further, Japanese Patent Application Laid-Open No. 7-309062 proposes a method in which a copy check pattern of characters and marks appears by combining a halftone dot having a size resolvable by a color copier and a halftone dot having a size not resolvable. ing.

[0003]

However, in the field of commercial printing and the like, some of the image forming bodies that emit light in the dark use phosphorescent ink, fluorescent ink, or the like, but they are used in a single color state. There is a problem of lack of novelty and fun. On the other hand, as a countermeasure for preventing forgery or falsification, a method of printing a part of a printed material with fine microcharacters conventionally used has a problem that microcharacters are reproduced due to improvement in resolution of a copying machine. . The method using colorless fluorescent ink has been used for a long time, but previously only a specific company was able to obtain it, so the printed matter using it had high security. However, there is a problem that the demand for fluorescent inks has increased, and colorless fluorescent inks can be obtained relatively easily, and security has been reduced. Conventionally,
When fluorescent ink is used as a countermeasure for counterfeiting gift certificates, the company name, logo, etc. are often printed with one color of fluorescent ink. If printed, there is a problem that a printed matter close to the real thing can be easily reproduced. In addition, when a printed matter having a built-in copy check pattern is copied, a potentially hidden warning character or pattern is revealed, and the copy, that is, a fake copy can be easily visually identified. Printing of printed materials with high print quality requires advanced plate making and printing technology to control the thickening and thinning of halftone dots in response to the progress of the resolution of color copiers, resulting in high printing costs. There is a problem. The present invention has been made in view of the above-mentioned problems, and uses fluorescent ink. However, there is novelty, duplication is not easy,
It is an object of the present invention to provide an image forming body having a high security and an anti-counterfeiting effect and a method of manufacturing the same.

[0004]

Means for solving the above problems are constituted as follows. (1) The first image region including a first colorant that emits visible light having a first spectral wavelength distribution by excitation light other than visible light, and the first image region by excitation light other than visible light. A second image area that emits visible light having a second spectral wavelength distribution different from the spectral wavelength distribution is formed. (2) The first spectral wavelength distribution and the first image area including the first colorant, the second image area including the second colorant, and excitation light other than visible light. The second
And a third image area including a third colorant that emits visible light having a third spectral wavelength distribution different from the spectral color distribution of the first colorant, the second colorant, And the visible light emitted by the third colorant is added to 3
It corresponds to one of the primary colors red, green, and blue. (3) The first of the first image area including the first colorant
And the content of the first colorant per unit area in a portion of the first image area including the first colorant.
And the content of the first colorant in the second portion different from the second portion is different, and the second image area per unit area in the first portion of the second image area including the second colorant is different.
And the third colorant content in a second portion different from the first portion of the second image area including the second colorant, and the third colorant content is changed. The content of the third colorant per unit area in the first portion of the third image region including the colorant, and the first of the third image region including the third colorant. The content of the third colorant in a second portion different from the portion is different. The content of the colorant per unit area as referred to in the present invention may be replaced with the dot area of the ink containing the colorant in the case of halftone printing, or in the case of conventional gravure printing, ink jet printing, etc. May be replaced by the transfer rate of the ink containing the colorant. (4) The spectral wavelength ranges of the excitation light for exciting each of the first to third colorants are at least partially overlapped. (5) The image area containing the colorant is made invisible under visible light. (6) Red, green, and blue image component data corresponding to the three primary colors of additive color mixing are created from an image or a subject, and visible light having a spectral wavelength distribution corresponding to the red is generated by excitation light other than visible light. The colorant that emits light is transferred and fixed to the substrate based on the red image component data, and the excitation light other than visible light emits the colorant that emits visible light having a spectral wavelength distribution corresponding to the green, Based on the green image component data, the color material that is fixed and transferred to the base material and emits visible light having a spectral wavelength distribution corresponding to the blue by excitation light other than visible light is based on the blue image component data. And transfer-fixed to the substrate. (7) In the step of creating red, green, and blue image component data corresponding to the three primary colors, tone data for each color is also created. These means exhibit the following effects. By means of the above (1), different types of visible light can be emitted from the two types of image areas, and the image forming body has novelty or is hard to forge or alter as compared with the conventional one-color light emitting image forming body. It can be. By means of the above (2), full-color development of red, green and blue corresponding to the three primary colors of additive color mixing is possible, and an image forming body which is extremely difficult to forge or forge can be obtained. By means of the above (3), gradation expression is possible in addition to the full color development. By means of the above (4), three types of red, green,
Blue light can be emitted. . By means of the above (5), the image area can be provided so as to overlap the general visible information printing pattern, and the degree of freedom of the layout of the image forming body can be increased. By means of the above (6), the additive color mixing 3
The red, green, and blue image component data corresponding to the primary colors are taken out, recorded on the base material, and the color tone of the image or the subject is added by the additive color mixing of the red, green, and blue coloring light from the base material. Reproducible. By means of the above (7), the gradation of the image or the subject is also recorded on the base material,
Reproducible.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. The "image forming body" of the present invention may be of any type as long as an image is formed on the substrate, such as the substrate, the type of the image, and the forming means. However, in the image forming body according to the present invention, since the object is often a printed matter such as a gift certificate, a passport, an ID card, and the like, “printed matter” is hereinafter used synonymously with “image forming body”.

Colorants that emit visible light by excitation light other than visible light include fluorescent inorganic pigments, fluorescent organic pigments, and fluorescent dyes. The color of these colorants themselves, that is, the body color may be white or colored. As an example of a white fluorescent inorganic pigment, an emission peak wavelength of 610 to 65 excited by ultraviolet light of 254 nm or 365 nm is obtained.
A device that emits 5 nm red light and has an emission peak wavelength of 50
One that emits green light of 5 to 534 nm and one that emits blue light having emission peak wavelengths of 435 and 445 nm are known. In addition, some of them emit visible light such as yellow-green, red-orange, and blue-green. In the present invention, these colorants are used as printing inks, and these colorants are hereinafter referred to as “fluorescent inks”. For fluorescent inks,
If a transparent resin is used as the vehicle, the body color will fade and the ink will become transparent or translucent,
Visual observation becomes difficult. Furthermore, by making the color of the base material as the base color similar to the body color, visual observation becomes more difficult. Such an ink that is difficult to see is hereinafter referred to as “transparent fluorescent ink”.

FIG. 1 is an explanatory view of an image forming body according to the present invention using two kinds of fluorescent inks. As shown in FIG. 1, an image forming body 10 according to the present invention has a first spectral wavelength distribution by a first colorant on a substrate 1 made of paper, plastic, metal, a laminate thereof, and the like. A first image area 1A corresponding to a background printed with a fluorescent ink that emits a color A of visible light and a fluorescent ink that emits a color C having a second spectral wavelength distribution by a second colorant A phosphor image 3-10 including a second image area 2C corresponding to the character "A" is formed. This phosphor image 3-10 may have any pattern, and as shown in FIG. 1, the two image areas are not necessarily divided and may not be adjacent to each other but may partially overlap. The overlapped image area shows light emission of a mixed color (that is, the third color) in which two spectral wavelength distributions are mixed. Further, as long as the phosphor image 3 is printed with a transparent fluorescent ink that is difficult to see, the area and position of the phosphor image 3-10 in the image forming body 10 are free, and the visible information print image 4 by general printing and It is possible to overlap and provide. Therefore, the image forming body 10
The layout freedom is not lost. But,
Even with colored fluorescent ink, there is no problem in the design of the pattern if a common visible ink pattern and a fluorescent ink pattern are used in a superimposed manner, such as the banknotes of a 10,000 yen bill currently in circulation. In this case, the fluorescent colorant may be mixed with the general ink, or a fluorescent ink layer may be formed outside the general ink layer.
It may be reprinted. The area of the phosphor image 3-10 is preferably as wide as economically permissible from the viewpoint of the amount of the fluorescent ink used. This is because the light emission of the fluorescent ink is easy to visually recognize when the area is large to some extent. It is preferable that the selection between the first colorant and the second colorant is such that the distinction between the A color and the C color of the visible light emitted from the first colorant and the second colorant can be clearly performed. Further, the printing in the two types of image areas 1A and 2C may be solid printing or may include gradation. When the spectral wavelength region of the excitation light of the first colorant and the spectral wavelength region of the excitation light of the second colorant are overlapped, the image forming body 10 including the phosphor image 3-10 contains the non-visible light. When a black light containing, for example, ultraviolet light, which is light in a wavelength region, is irradiated, the phosphor image 3-10 emits A color and C color from the solid printed image region 1A and the image region 2C, respectively, and partially. When they overlap, in addition to the colors A and C, the overlapping portion emits the color D, and the phosphor image 3-10 is substantially composed of three types of visible light. Further, when a density gradation is provided in at least one of the image areas 1A and 2C, visible light of more colors is emitted from the overlapped portion, and a visible image rich in color change is obtained. The phosphor image 3-10 using the two types of fluorescent inks described above emits more colors than the conventional one-color phosphor image, and even if an image forming body that produces the same color is to be forged. , Its reproduction becomes difficult. Even if the image forming body 10 according to the present invention is forged, it is possible to easily determine the authenticity only by looking at the phosphor image portion.

FIG. 2 is an explanatory view of an image forming body according to the present invention using three kinds of fluorescent inks. As shown in FIG. 2, in the image forming body 20 according to the present invention, three kinds of visible wavelength distributions of red (hereinafter R), green (hereinafter G), and blue (hereinafter B) are provided on the substrate 1. First, second and third light emitting
The first image area 1R, the second image area 2G, and the third image area 3B, which are printed with a transparent fluorescent ink using the colorant described above, are formed so as to overlap each other to form a figure of a female face. As shown in FIG. 2, the first to third image areas 1R, 2G, and 3B each form an arbitrary pattern even if they do not overlap, and each is independent, for example, forming an abstract pattern. Good. However, as an image used for authenticity determination, an image like a human face is preferable. Since the phosphor image 3-20 is printed with a transparent fluorescent ink, its position on the image forming body 20 cannot be confirmed by visual observation, and it can be freely located at any position on the image forming body 20, It may overlap with the print image 4. Further, it is preferable that the area is wide as far as it is economically permissible from the viewpoint of the amount of ink used and the like, since the image is powerful and can be easily identified. Three types of first to third light emitting R, G, B
It is preferable to select a colorant which allows color reproduction in as wide a range as possible in additive color mixing of R, G, and B.

In the image forming body 20 shown in FIG. 2, the R, R
Images with gradations are printed in register with the G and B fluorescent inks, respectively. Therefore, each image area 1
The contents of the first to third colorants per unit area of two different points in each of R, 2G, and 3B are measured differently. In other words, the intensity of the visible light of R, G, and B emitted from two different points exists. Therefore, a pattern with subtle details such as a person's face can be reproduced with the visible light of R, G, and B.

In addition, the light in the wavelength region other than the optimal visible light region for exciting the first to third colorants to emit R, G, B visible light, that is, the spectral wavelength distribution of the exciting light is at least partially. It is preferred that they overlap. This is because R, G, and B light can be efficiently emitted by one type of excitation light containing a large amount of wavelength light in the overlapping portion.
Therefore, it is necessary to select the first to third colorants not only from the above color reproduction range but also from the viewpoint of the efficiency of the excitation light.

Next, a method of manufacturing an image forming body according to the present invention will be described. The method for producing an image forming body according to the present invention is roughly divided into the following steps. (1) Based on the original color image or subject
The three primary colors of additive color mixing, R, G, and B image component data are created and recorded as needed. (2) excited by light in a wavelength region other than visible light,
A colorant that emits visible light having a spectral wavelength distribution corresponding to R,
Based on the image component data of R, it is transferred and fixed to the substrate. (3) excited by light in a wavelength region other than visible light,
A colorant that emits visible light having a spectral wavelength distribution corresponding to G,
Based on the G image component data, the image is transferred and fixed to the substrate. (4) excited by light in a wavelength region other than visible light,
A colorant that emits visible light having a spectral wavelength distribution corresponding to B,
Based on the image component data of B, the image is transferred and fixed to a substrate.
The following manufacturing method can be adopted as the specific method described above. The above steps (2) to (4) are performed substantially simultaneously, and the order is not limited to the number.

First, R, G, B image component data is generated by reading an original image once recorded on a color film by a color scanner and obtaining R, G, B image component data obtained through an R, G, B separation filter. Or a fluorescent ink created using three primary colors by selecting data of three primary colors yellow (Y), magenta (M), and cyan (C) by subtractive color mixing for printing. Are excited according to the spectral wavelength distributions of R, G, and B, and output R, G, and B are output by a conversion table created in advance.
Convert to B image component data. This conversion is incomplete because the spectral wavelength distribution and intensity of R, G, and B emitted by the fluorescent ink are significantly different from the ideal spectral wavelength distribution and intensity of R, G, and B for additive color mixing. Even if R, G, and B emit the best fluorescent inks, R,
This is for correcting the G and B image component data. Subsequently, the converted data is temporarily stored in a magnetic drum storage device or directly sent to an image setter and output to three original films. Using this original plate film, ordinary plate making such as offset and gravure is performed, and finally, a phosphor is formed on the substrate 1 using R, G, and B fluorescent inks prepared from three kinds of selected colorants. Image 3-20 is printed in three colors. Since the fluorescent ink is nearly transparent, the printing order of the R, G, and B fluorescent inks is free.

Further, a subject is photographed through an R, G, B filter using a digital camera having a CCD having at least 1.3 million pixels or more in a camera back, and the photographed data is temporarily downloaded to an external hard disk, or directly to a computer. , The input R, G, B image component data is converted into output R, G, B image component data, and output to a plate making film by an imagesetter. Alternatively, the phosphor image 3-20 is formed by directly transferring heat from an R, G, B fluorescent thermal transfer type ribbon prepared in advance from a printer by skipping the plate making process, or by jetting R, G, B fluorescent inkjet ink from an inkjet apparatus. May be.

Furthermore, today, designers can use a positive image captured from an image reader by a designer to perform color matching that is almost the same as that of the original image or the subject on a computer screen. ,
Without creating G and B image component data, an image having vivid and realistic color tone and gradation can be created on a color display, and the R, G, and B image component data constituting this screen can be directly used as it is. The phosphor image may be formed by using the R, G, B fluorescent ink or the fluorescent heat transfer ribbon.

FIG. 3 is a schematic sectional view of the phosphor image portion of the image forming body according to the present invention. FIG. 3A is a schematic cross-sectional view of a phosphor image area when two colors of fluorescent ink are used.
What is the layer configuration of the phosphor image section 3-10? A visible information printing layer 4 made of general visible ink such as general visible information is provided on a substrate 1 such as paper or plastic, and an ultraviolet (UV) absorbing layer 5 covering the entire surface of the substrate 1 is provided thereon. This is because, when a whitening agent is used in the paper of the base material 1, the visible light emitted by excitation of the whitening agent becomes a hindrance as noise, and it is necessary to block the visible light. UV from 1 side
Should be reflected uniformly, but this is to prevent the unevenness due to the influence of the visible information print layer 4 and the occurrence of noise. Therefore, if the base material 1 does not use a whitening agent and the phosphor image 3-20 is provided so as not to overlap the visible information printed image 4, the UV absorbing layer 5 does not need to be provided. Next, a predetermined portion is printed with fluorescent inks of colors A and C to provide a fluorescent ink layer 6. Finally, an OP layer 7 made of an acrylic resin or the like functioning as a protective layer
Is provided on the entire surface. In the above layer configuration, the fluorescent ink layer 6
The OP layer 7 must be transparent to both ultraviolet light as excitation light and visible light emitted from the fluorescent ink.

FIG. 3B is a schematic cross-sectional view of the phosphor image portion 3-20 when using fluorescent inks emitting three colors of R, G, and B. Compared with FIG. Only the ink layer 6 is different, and the other layer configurations are the same. The same applies to the function and effect of the UV absorbing layer 5. R,
The G and B fluorescent ink layers 6 can be provided so as to overlap with the visible information printing layer 4 via the UV absorbing layer 5.

The transparent fluorescent ink used in the image forming body according to the present invention is light in a wavelength region other than visible light,
It contains a colorant that emits desired visible light when excited by V light. The colorant is a phosphor, which is a substance that emits luminescence in a broad sense. As the inorganic fluorescent pigment, Ca,
Oxides such as Ba, Mg, Zn, and Cd, sulfides, silicates, and other crystals are the main components, and Mn, Zn, Ag, C
A pigment obtained by adding a metal element such as u, Sb, Pb or the like or a rare earth element such as a lanthanoid as an activator and calcining the same is used. As organic fluorescent pigments, diaminostilbene disulfonic acid derivatives, imidazole derivatives, coumarin derivatives, triazoles, pyridines, naphthalic acids,
Derivatives such as imidazolone, dyes such as fluorescein and eosin, and compounds having a benzene cyclic olefin copolymer such as anthracene are used. Inorganic pigments are excellent in terms of durability and weather resistance of colorless fluorescent inks, but organic pigments are excellent in ink suitability without any particular surface treatment because organic pigments can be reduced in particle size. In order to improve the fluorescent properties such as the luminance of the fluorescent ink and the printability, it is preferable to use a fluorescent pigment having a particle diameter of 0.7 to 50 μm, preferably 1.0 to 20 μm.
It is good to use the pigment particle of the range of. 0.7μm particle size
If the particle size is less than 50 μm, the ink tends to have poor fluidity. The content of the fluorescent pigment based on the entire fluorescent ink composition is suitably from 15 to 50% by weight, and the preferable range is from 20 to 40% by weight. Furthermore, in the present invention, in order to improve the properties (hiding power, coloring power, oil supply amount, durability, etc.) of the pigment, it is preferable to carry out a surface treatment for imparting an affinity to the resin constituting the vehicle. . The vehicle is required to be transparent to both the excitation light and the visible light emitted from the colorant. Examples of the resin constituting the vehicle of the present invention include natural resins such as cellulose, shellac, and rosin, vinyl resins,
Thermoplastic resins such as acrylic resin, styrene resin, polyolefin resin, etc., urea resin, melamine resin, polyurethane resin, epoxy, unsaturated polyester resin, etc. A plasticizer for stabilizing the strength, a solvent for adjusting the viscosity, and a solvent for drying, and auxiliaries such as drying, viscosity, dispersibility, and various reactants are appropriately added. Further, the present invention, after drying the fluorescent ink film, so as not to adsorb contaminants, an electron beam curable ink comprising a monofunctional acrylate or polyfunctional acrylate without using a solvent, or further a photopolymerization initiator,
Use of a photopolymerization-curable ink to which a sensitizer and an auxiliary agent are added is also an effective means.

The use of the transparent fluorescent ink for printing the phosphor image of the image forming body according to the present invention has a problem that it is impossible to check whether or not printing has been performed and further to check the register system. . Therefore, it is preferable to further mix a decolorable colorant in the fluorescent ink composition. The fluorescent ink mixed with the decolorizable colorant shows a visible state at the printing stage, and can be irreversibly decolored by an operation such as irradiation with near infrared rays.
As the decolorable colorant, IR820B (manufactured by Showa Denko) or a cyanine dye and an organic boron ammonium salt such as tetrabutylammonium / butylphenylborate coexist to absorb near-infrared rays and couple the two. Some are reversibly transparent.

The UV absorber used in the image forming body according to the present invention includes zinc oxide and titanium oxide. These inorganic particulate materials are substantially transparent to visible light. Further, the particle size is preferably in the range of 0.1 to 1 μm from the viewpoint of not moving to the fluorescent ink layer.

Example 1 An example sample of an ID card using two colors of fluorescent ink as shown in FIG. 1 was experimentally manufactured. An offset printing plate composed of a character plate and a two-color fluorescent ink special color plate was prepared from the character plate of the visible information print image and the plate of the logo “A”. At this time, a part of the characters of the print image for visible information was made to overlap with the logo. As the base material 1,
White polyethylene terephthalate sheet (188 μm)
Was used, offset printing was performed with black ink for process color using a character plate on the processed surface, and then UV-absorbing ink was solid printed on the entire surface of the image forming body 10.
Next, offset printing was performed using fluorescent inks that colored the logo background blue and the logo characters red, respectively, using two special color plates for fluorescent ink. The two-color fluorescent ink has a peak wavelength of 4 when excited by 254 nm ultraviolet light.
A transparent fluorescent inorganic pigment that emits blue light of 45 nm and red light of a peak wavelength of 655 nm was used. The UV absorbing ink contains 10% by weight of Tinuvin (Ciba Geigy).
The mixed one was used. ID manufactured as above
In the example samples of the card, the presence of the logo "A" could not be visually recognized. When the above-mentioned ID card was irradiated with a black lamp containing ultraviolet light having a peak wavelength of 254 nm, the phosphor image portion 3-1 of the logo “A” was obtained.
From 0, the red letter A appeared in the blue background. By the combination of the two, an image having a strong contrast was obtained, and the red color of the character appeared more vivid than seen in a single color, and the character A appeared to be in front. In addition, although a part of the characters for visible information overlapped the logo, the character image of the overlapped portion did not adversely affect the phosphor image.

(Embodiment 2) R, G, B as shown in FIG.
Example samples using three colors of fluorescent ink were prototyped by the following method. First, by exciting with ultraviolet light of 254 nm, R
(Peak wavelength 625 nm), G (peak wavelength 508 n)
m) and B (peak wavelength: 445 nm) were prepared as R, G, and B fluorescent inks by offsetting the transparent fluorescent inorganic pigment that emits light. Its composition is as follows. R fluorescent ink R fluorescent pigment (manufactured by Nemoto Special Chemicals) 50% by weight micro silica 4 organic bentonite 1 alkyd resin 35 solvent (alkylbenzene type) 10 G fluorescent ink G fluorescent pigment (manufactured by Nemoto Special Chemicals) 6.5% by weight micro silica 10 Organic Bentonite 2 Alkyd Resin 65 Solvent (Alkylbenzene) 16.5 B Fluorescent Ink B Fluorescent Pigment (manufactured by Nemoto Specialty Chemicals) 25% by weight Microsilica 8 Organic Bentonite 2 Alkyd Resin 50 Solvent (Alkylbenzene) 15 Female face as color manuscript Was photographed on a color film and read at a resolution of 400 DPI by a color scanner, and the obtained Y, M and C data were prepared in advance based on the spectral wavelength distributions of R, G and B emitted by the above-described fluorescent ink. For output with conversion table The following R,
The data was converted into G and B image component data, and this was output from an image setter onto a plate making film to obtain an original film having R, G, and B color separation netting images. Using this film, R, G, and B special color printing plates for offset were prepared in the usual manner. Fine paper 9 without optical brightener as base material
At 0 g / m ² , the characters for printing visible information shown in FIG. 2 were printed using process color black. Next, three-color printing was performed at predetermined positions as shown in FIG. 2 using the R, G, and B fluorescent inks and the printing plate, thereby providing a phosphor image 3-20. Finally, OP so as to cover the entire image forming body 10
Layer 7 was formed by solid printing of offset printing. In the sample sample of the gift certificate obtained by the above method, the phosphor image 3-20 was not visible, but the peak wavelength was 2
When a black lamp containing ultraviolet light of 54 nm was irradiated, a female face close to the color film of the document emerged. Even if an attempt is made to forge a genuine image forming body 20 having the phosphor image 3-20 manufactured by the above method, the underlying color original cannot be seen, and copying by a color copier cannot be used at all, Even if the R, G, B phosphors of three colors are found as a result of the analysis, the R, G,
It is extremely difficult to reproduce the B image component data, the color balance of R, G, B, etc. exactly in the same way as the real thing, and it is impossible to reproduce substantially the same thing as the real phosphor image. Therefore, the image forming body 20 having the R, G, B phosphor images manufactured by the above method according to the present invention has extremely high security.

The printed matter according to the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention. For example, the position where the phosphor image is provided may be on the back surface of the base material, and the fluorescent ink of two or more colors does not necessarily need to be transparent, depending on the type of the phosphor image formed, and may be colored. Is also good. That is, a visible phosphor image is formed on the image forming body by the colored fluorescent ink, and by irradiating the phosphor with black light, an image with the same pattern but completely different fluorescence may be formed. . Also, the color of the fluorescent ink is not limited to R, G, and B, and orange, yellow, pink, and the like, or intermediate colors thereof may be used. The transfer and fixing means of the colorant on the base material used in the present invention may be performed by the above-described ordinary printing method using a fluorescent ink or by processing the colorant once onto transfer paper, Alternatively, a non-impact (including a thermal transfer method) method may be used, or a liquid ink may be processed using a fluorescent dye, and two or three colors of printing or printing may be performed by an ink jet method. You may.

[0023]

As described above, the image forming body according to the present invention emits visible light of at least two colors from the phosphor image portion formed on at least a part of the base material, thereby allowing a latent image to be visually observed. This makes it possible to provide a novel eye-catching effect that cannot be seen with conventional one-color light emission, and to make a color copier having an excellent copying function completely unusable as a forgery means. Further, by making the phosphor image transparent and providing the UV absorbing layer, the degree of freedom in the layout of the image forming body can be increased. Further, if an attempt is made to forge a visible image formed by three colors of fluorescent ink that emits R, G, and B visible lights of the image forming body according to the present invention, there is no color original or subject, and , G, B
Type of fluorescent ink, setting conditions of conversion table for converting input R, G, B image component data to output R, G, B image data, color balance setting conditions of R, G, B, printing conditions, etc. Is difficult to determine, and it is extremely difficult to faithfully reproduce a visible image. Therefore, the image forming body according to the present invention has a high forgery or alteration prevention effect, and can enhance security.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an image forming body according to the present invention using two-color fluorescent ink.

FIG. 2 is an explanatory diagram of an image forming body according to the present invention using three color fluorescent inks.

FIG. 3 is a schematic sectional view of a phosphor image portion of an image forming body according to the present invention.

[Explanation of symbols]

Reference Signs List 1 base material 1A first image area printed with fluorescent ink emitting A color 2C second image area printed with fluorescent ink emitting C color 3-10 phosphor image, phosphor image section (In the case of two-color fluorescent ink) 3-20 Phosphor image, phosphor image area (in the case of three-color fluorescent ink) 4 Visible information printed image or visible information printed layer 5 UV absorption layer 6 Fluorescent ink layer 7 OP layer 10 Image forming body of the present invention using two-color fluorescent ink 20 Image forming body of the present invention using three-color fluorescent ink

Claims (7)

[Claims] 1. A first image area including a first colorant that emits visible light having a first spectral wavelength distribution by excitation light other than visible light, and the first image area including excitation light other than visible light. An image forming body comprising a second image area that emits visible light having a second spectral wavelength distribution different from the first spectral wavelength distribution. 2. The first spectral wavelength according to the first image area including the first colorant, the second image area including the second colorant, and excitation light other than visible light. A third image area including a third colorant that emits visible light having a distribution and a third spectral wavelength distribution different from the second spectral wavelength distribution, wherein the first colorant and the second 2. The image forming body according to claim 1, wherein the colorant and the visible light emitted by the third colorant correspond to any of red, green, and blue, which are three primary colors of additive color mixing, respectively. 3. The content of the first colorant per unit area in a first portion of the first image area including the first colorant, and the first content including the first colorant. The content of the first colorant in a second portion different from the first portion of the first image region is different, and the content of the first colorant in the first portion of the second image region including the second colorant is different. The content of the second colorant per unit area,
The content of the second colorant in a second portion different from the first portion of the second image area including the second colorant is different, and the content of the second colorant in the second portion includes the third colorant. A content of the third colorant per unit area in a first portion of the third image area;
The image forming body according to claim 2, wherein a content of the third colorant in a second portion different from a first portion of the third image area including the third colorant is different. 4. The image forming body according to claim 1, wherein a spectral wavelength region of the excitation light for exciting each of the first to third colorants at least partially overlaps. . 5. The image forming body according to claim 1, wherein the image area containing the colorant is difficult to see under visible light. 6. A step of creating image component data of red, green, and blue corresponding to three primary colors of an additive color mixture from an image or a subject, and a spectral wavelength distribution corresponding to the red by excitation light other than visible light. Transferring and fixing a colorant that emits visible light to a base material based on the red image component data; and emitting visible light having a spectral wavelength distribution corresponding to the green by excitation light other than visible light. Transferring and fixing a colorant to be transferred to a base material based on the green image component data, and a colorant that emits visible light having a spectral wavelength distribution corresponding to the blue by excitation light other than visible light, Transferring and fixing to a substrate based on the blue image component data. 7. The method of manufacturing an image forming body according to claim 6, wherein, in the step of creating red, green, and blue image component data corresponding to the three primary colors, gradation data for each color is created.