JP2007168356A - Image forming body with latent image pattern - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming body which enables the verification of the truth to be easily and surely performed even if a verification film for development (the verification of the truth) is not separately prepared and which has a latent image pattern excellent in security by imparting the degree of freedom to the latent image pattern, and a developing method for the image forming body. <P>SOLUTION: In this image forming body 1, latent image patterns 10A, 10B and 10C, which are composed of lines with a line ratio of 1:1 and the same pitch, and the other line-like non-latent-image patterns are formed in a combined manner at three corners on one paper base material 42; and the phase of the latent image pattern and that of the non-latent-image pattern are deviated from each other by half a pitch. The latent image patterns 10A, 10B and 10C, which are formed at the three corners, and a line-like pattern 20 for verification, which has the same line ratio and the same pitch, are formed at one corner regarded as a target for fold lines 40A, 40B and 40C. The image forming body 1 has the latent image pattern in which a watermark printed layer 44 is applied to parts of the line-like latent image pattern and the line-like pattern for verification. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is applied to an image forming body that is required to prevent counterfeiting and copying of securities such as stocks / bonds, gift certificates or certification papers used in local governments, admission tickets, etc. The present invention relates to an image forming body having a latent image pattern which has a difficult latent image pattern and can be visualized by another tool for recognizing the latent image pattern.

  Conventionally, in addition to securities such as stock certificates, gift certificates, credit cards, etc., printing with sophisticated printing technology has been applied to prevent unauthorized use due to counterfeiting and duplication, such as seals and tags for products. However, in view of the frequent occurrence of unauthorized use due to counterfeiting and copying in recent years, special anti-counterfeiting measures have been taken in addition to these sophisticated printing.

  As a special anti-counterfeiting measure, for example, there is a method of pasting a hologram, applying a material or image that develops color with ultraviolet rays, and performing authenticity judgment by irradiating with ultraviolet rays. An embossed pattern in which multiple line-shaped uneven pattern groups with different line directions are formed. As an image body with a so-called opal effect, the shading and brightness of the line-shaped uneven pattern group changes when the viewing angle is changed. There are methods such as pasting on securities.

  Any of the above anti-counterfeiting measures can recognize a hidden pattern etc. by visual observation such as changing the angle, and forgery of this anti-counterfeiting technology was relatively easy to forge .

  In contrast to the anti-counterfeiting technology, a hidden line (latent image pattern) or the like cannot be recognized at first glance, but a line is composed of a latent image part having a width of approximately 1: 1 and a non-latent image part. When a line film having a line pattern of the same shape as this line is superimposed on a printed matter whose phase is shifted by 1/2 pitch between the latent image part and the non-latent image part, the non-latent image part becomes the line film. There is a method using a technique called the “line moiré method” that is hidden by the line pattern, and only the latent image part appears to appear as an image, and authenticity is determined by the presence or absence of the image of the latent image part. is there.

  The above-mentioned “line moire method” will be described in more detail. For example, as shown in the front view of FIG. 6, a line pattern having a width and pitch of about 1: 1 is a heart-shaped latent image portion (30) and The non-latent image portion (32) is formed, and as shown in FIG. 7 as a partially enlarged view of the A portion shown in FIG. 6, the latent image portion (30) and the non-latent image portion (32) are formed. The line direction of the line pattern is the same direction, and the phase of the line is shifted by ½ pitch. This image is called a line moiré image (3), for example, shown in the front enlarged view of FIG. Thus, when a line film (34) having a line pattern having the same shape as this line (line width (W) and pitch (P)) is superimposed, the non-latent image portion (32) is As shown in the front view of FIG. 9, only the latent image portion (30) is hidden by the line pattern of the line film (34). In which it becomes visible emerged as preparative image.

  When this line moire image (3) is used for anti-counterfeiting, for example, a triangular visible image (36) is formed in the vicinity of the latent image portion (30) as shown in FIG. Normally, only the visible visible image (36) is visible to the naked eye, so this visible image (36) seems to be an anti-counterfeiting measure at first glance. In addition, by superimposing the line film (34) on the line moire image, as shown in FIG. 9, it is performed with or without a heart-shaped latent image portion (30) in addition to the visible image (36). (For example, refer to Patent Document 1).

  Further, as a technique that makes it difficult to duplicate the technique of the “line moiré method”, for example, a line with the same pitch in which the line ratio between the line part and the non-line part is 1: 1 on the sheet, Two to several types of line patterns arranged at different line angles are formed, and the phase is shifted by a half pitch with respect to the line pattern within one to several types of line pattern areas of the line patterns. There is a formed image forming body having a latent image line pattern of characters, and in this visualization, the visualized line sheets having the same pitch as the line pattern are aligned with each other so that the line angle matches each other. In some cases, a latent image line pattern of characters formed in a line pattern area corresponding to each line angle is visualized when they are superposed (see, for example, Patent Document 2).

The above prior art documents are shown below.
Japanese Utility Model Publication No. 62-20307 JP 2001-213042 A

  However, in any of the above-mentioned “line moiré methods”, when the latent image pattern is visualized (verification for verifying the authenticity of securities, etc.), the verification transparency that matches the latent image pattern A separate film is required, and it is necessary to distribute the verification film to a verification laboratory or the like that performs the verification, and the management thereof is not easy. Furthermore, if there is only one type of verification film distributed, the latent image pattern formed on securities, etc., and the pitch, line shape, etc., must be matched to it. However, there was a problem that there was a limit.

  The present invention solves the problems of the prior art, and the problem is that on the sheet-like base material, the line-to-non-line portion ratio is approximately 1: 1 and the pitch is Substantially the same line-shaped latent image pattern and other line-shaped non-latent image patterns are formed, and the phase of the line-shaped latent image pattern and the line-shaped non-latent image pattern is approximately ½. Even if the image forming body is shifted in pitch and the latent image pattern is visualized (authentication verification), a verification film for verifying it can be easily and securely verified without special preparation. Since it does not require a verification film, it gives a degree of freedom to the shape and pitch of the latent image pattern, so that an image forming body having a latent image pattern with excellent security including design can be obtained. It is to provide.

  In order to achieve the above object in the present invention, first, in the invention of claim 1, the line ratio of the line portion to the non-line portion is approximately 1: 1 at least at one place on the opaque sheet-like substrate. The line-shaped latent image pattern having substantially the same pitch and the other line-shaped non-latent image pattern are combined to form the line-shaped latent image pattern and the line-shaped non-latent image. In the image forming body having a latent image pattern in which the phase of the pattern is shifted, the line-shaped latent image pattern has a line-to-line ratio of about 1: 1, and the pitch is substantially the same as the line-shaped latent image pattern. The verification line pattern is formed so that the line-shaped latent image pattern is visualized when the base material is folded and overlapped, and the position of the line-shaped latent image pattern and the position of the verification line-shaped pattern is based on Latent image putter characterized in that the material is made transparent or translucent It is obtained by the image forming body having a.

  For the transparency or translucency, for example, watermark printing or paper watermark may be applied, and the opacity is preferably 50% or less for visualization.

  In the invention of claim 2, the line ratio of the line part and the non-line part is approximately 1: 1 and the pitch is substantially the same at least at one place on the transparent or translucent sheet-like substrate. The line-shaped latent image pattern and the other line-shaped non-latent image pattern are combined and formed, and the line-shaped latent image pattern and the line-shaped non-latent image pattern are shifted in phase. In the image forming body having a pattern, the line-shaped latent image pattern has a line-line ratio of about 1: 1, and the verification line-shaped pattern having a pitch substantially the same as the line-shaped latent image pattern is the line-shaped latent image pattern. An image forming body having a latent image pattern is characterized in that the linear latent image pattern is formed to be visible when the substrate is folded and overlapped.

  For the visualization, the substrate must be transparent or translucent, and preferably has an opacity of 50% or less.

  In the invention of claim 3, the line-like latent image pattern and line-like non-latent image pattern are formed of special inks that are not visible. An image forming body having the latent image pattern described in the item.

  The image forming body having the latent image pattern according to any one of claims 1 to 3, wherein the verification line pattern is folded back to the line-shaped latent image pattern formed on the image forming body (or The line-like latent image pattern can be visualized (visualized) with transmitted light by being folded back and aligned with a virtual line.

  The “opacity” mentioned above is a value obtained by the paper opacity test method specified in JIS P8138, and is measured by setting a green filter using a hunter reflectometer. The measurement method is that when a white plate having a reflectance of 89% is applied to the back of the test paper and a black plate (similarly having a reflectance of 0.5% or less) is applied. The reflectance ratio is expressed as a percentage.

  In addition, the above-mentioned “line ratio between the line part and the non-line part” is a ratio of the width of one line (line part) to the width between the lines (non-line part). say.

  Since this invention is the above structure, there exist the following effects.

  That is, according to the first aspect of the present invention, the line-to-non-linear portion ratio is approximately 1: 1 and the pitch is substantially equal to each other at least at one location on the opaque sheet-like substrate. The same line-shaped latent image pattern and the other line-shaped non-latent image pattern are formed to be combined, and the line-shaped latent image pattern and the line-shaped non-latent image pattern are shifted in phase. In the image forming body having an image pattern, the line-shaped latent image pattern has a line-line ratio of about 1: 1, and a verification line-shaped pattern having a pitch substantially the same as the line-shaped latent image pattern. When the base material is folded and overlapped, the line-shaped latent image pattern is formed to be visualized, and the base material at the position of the line-shaped latent image pattern and the verification line-shaped pattern is made transparent or translucent Therefore, when verifying the line-like latent image pattern, Since the latent image pattern and the verification line pattern are in a single sheet, a separate verification line film is not required as in the prior art. Film management becomes easy.

  Furthermore, it is possible to obtain an image forming body having a latent image pattern that can increase the flexibility of the line shape of the latent image pattern, its pitch, and the like, and can improve the security including design.

According to the second aspect of the present invention, the line ratio between the line part and the non-line part is approximately 1: 1 at least at one place on the transparent or translucent sheet-like substrate, and the pitch Are formed by combining substantially the same line-shaped latent image pattern and other line-shaped non-latent image patterns, and shifting the phases of the line-shaped latent image pattern and the line-shaped non-latent image pattern. In the image forming body having a latent image pattern, the line-like latent image pattern has a line-to-line ratio of about 1: 1 and has a pitch substantially the same as the line-like latent image pattern. The line-shaped latent image pattern is formed by visualizing the line-shaped latent image pattern when the substrate is folded and overlapped, thereby verifying the line-shaped latent image pattern as in the case of the invention of claim 1. At this time, this line-shaped latent image pattern and the verification line-shaped pattern are one sheet. Since in the seat, without the need for conventional parallel line film for verifying separately as, therefore, it is easy to manage line screen films such verification offices for performing the verification.

  Furthermore, it is possible to obtain an image forming body having a latent image pattern that can increase the flexibility of the line shape of the latent image pattern, its pitch, and the like, and can improve the security including design.

  Regarding the above-mentioned claim 1 or 2, in order to conceal the latent image and improve the visibility at the time of visualization, the line ratio is most preferably 1: 1, but even if it is slightly different from 1: 1, some effect is obtained. The same pitch is most preferable, but a certain degree of effect can be obtained even if the pitch is slightly different, and a phase shift of 1/2 pitch is most preferable, but a certain degree of effect can be obtained even if it is slightly different from 1/2. In any case, the closer to the best, the better.

  Preferably, the line width of the line-shaped latent image pattern, line-shaped non-latent image pattern, and verification line-shaped pattern is in the range of 30 to 500 μm, so that the line-shaped latent image pattern by printing or the like is used. And a line-shaped non-latent image pattern and a verification line-shaped pattern reproducibility (reproducibility of fine lines), and has a latent image pattern that makes it difficult to visually recognize the line-shaped latent image pattern of the image forming body. If the line width of the line-shaped latent image pattern or the like is less than 30 μm, the reproducibility of the line-shaped latent image pattern or the verification line-shaped pattern of the image formed body by printing or the like is insufficient. The design is too fine, and even if the verification line pattern is superimposed, it becomes difficult to visually recognize or machine-read. On the contrary, if it exceeds 500 μm, the line-like latent image pattern formed on the image forming body is visually (For verification Or also) be determined with no superimposed Jo pattern, it may easily be copied reproduced by a copying machine, less preferred.

  Furthermore, according to the invention according to claim 3, the line-like latent image pattern and the line-like non-latent image pattern are formed of special inks that cannot be visually checked, so Other than machine reading, the image forming body having a latent image pattern with higher security that cannot be visually recognized and cannot be reproduced by a copying machine or the like can be obtained.

  As a method for visualizing an image forming body having the latent image pattern, a verification line pattern is folded back by a folding line (or virtual line) on the line-shaped latent image pattern formed on the image forming body. The line-shaped latent image pattern is visualized with transmitted light so as to be aligned with each other, so that a separate line-pattern film for verification is not required as in the prior art. It is possible to provide a method for visualizing an image forming body having a latent image pattern that enables easy and reliable verification work and management at a verification place and the like and enables verification with excellent security.

  The folding line is not necessarily provided, but it is preferable to provide the folding line because it facilitates superimposition at the time of visualization. However, since the surface is often printed, it is preferable to make the color less noticeable or thinner.

  Therefore, the present invention is excellent as an image forming body having a latent image pattern for preventing counterfeiting and copying of securities such as stocks / bonds, gift certificates or certificate papers used in local governments, admission tickets, and a method for visualization thereof. It has a practical effect.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is an explanatory view showing an example of an image forming body having a latent image pattern of the present invention, and FIG. 2 is an explanatory view showing another example of an image forming body having a latent image pattern of the present invention. . 3 is an explanatory diagram showing an example of visualization of the image forming body having the latent image pattern of FIG. 1, and FIG. 4 is an example of visualization of the image forming body having the latent image pattern of FIG. It is explanatory drawing which shows a case. FIG. 5 is an explanatory view showing an example of the line pattern of the line pattern constituting the image forming body having the latent image pattern of the present invention.

  As shown in the plan view of FIG. 1A, for example, the image forming body having a latent image pattern according to the present invention has a line formed at three corners of an upper part and a lower left part of a substantially square-shaped paper substrate (42). The latent image pattern A (10A), the latent image pattern B (10B), the latent image pattern C (10C), and the other than that, where the ratio of the line to the non-line part is 1: 1 and the pitch is the same. It is formed by combining non-latent image patterns (not shown in particular) composed of lines, and the latent image patterns A, B, C (10A, 10B, 10C) composed of lines and non-latent images composed of lines. The phase of the image pattern (not shown) is shifted by 1/2 pitch.

  A typical example of the sheet-like base material of the present invention is “paper” as described above, but is not necessarily limited to paper, and if it can be printed and bent, for example, a plastic sheet But you can. This plastic sheet is originally transparent or translucent, and the opacity can be selectively increased by printing on the surface or matting (roughening the surface to reduce the smoothness).

  As described above, the line pattern for verification (line patterns A, B, and C (10A, 10B, and 10C) formed at the three corners are the same as the line pattern and have the same pitch. 20) is formed in the lower right corner, and the latent image patterns A, B, and C (10A, 10B, and 10C) are formed of the respective lines in which the verification line pattern (20) is formed in the three corners. ), The fold line A (40A), the fold line B (40B), and the fold line C (40C) form an object shape.

  Further, for example, as shown in FIG. 1 (b) showing the BB plane of FIG. 1 (a) in cross section, a latent image pattern A (10A) formed by a line formed at the upper left corner and the right side A latent image in which a watermark printing layer (44) having an opacity of 50% or less is applied on a paper substrate (42) corresponding to the position of the verification line pattern (20) formed in the lower corner. The image forming body (1) has a pattern.

  Note that watermark printing is also performed on the paper substrate (42) corresponding to the positions of the latent image patterns B and C (10B, 10C) formed by lines formed at the upper right and lower left corners shown in FIG. A layer (not shown) is applied. Also, the watermark printing layer (44) shown in FIG. 1B may be formed on the latent image pattern A (10A) or the verification line pattern (20) formed of a line, and further this watermark printing. In place of the layer (44), although not shown in particular, it is a paper watermark (of which a white watermark is used) that makes this portion of the cardboard thin so that the opacity is 50% or less when the paper base (42) is made. May be.

As a method for visualizing an image forming body (1) having a latent image pattern as shown in FIGS. 1 (a) and 1 (b), for example, with respect to a folding line A (40A) of about 45 ° rising to the right, The latent image pattern A (10A) and the verification line pattern (20), which are line-shaped in relation to the target shape, are folded at a wrapping line A (40A), for example, as shown in FIG. When the direction of each line is aligned and superimposed, the latent image pattern composed of lines is visualized. That is, the letter “A” can be visually recognized or machine-read by transmitted light (not shown) from the rear.

  Further, with respect to the folding line B (40B) at the center in the horizontal direction shown in FIG. 1 (a), a latent image pattern B (10B) composed of parallel lines and a verification line pattern (20) which are related to the target shape. For example, as shown in FIG. 3B, when the lines are folded at the folding line B (40B) and the directions of the respective lines are aligned and superimposed, the latent image pattern formed by the lines is visualized. That is, the letter “B” can be visually recognized or machine-read by transmitted light (not shown) from behind.

  Furthermore, with respect to the folding line C (40C) at the center in the vertical direction shown in FIG. 1 (a), a latent image pattern C (10C) composed of parallel lines having a target shape relationship and a verification line pattern (20). For example, as shown in FIG. 3C, when the lines are folded at the folding line C (40C) and the directions of the lines are aligned and superimposed, the latent image pattern of the lines is visualized. That is, the letter “C” can be visually recognized or machine-read by transmitted light (not shown) from the rear, and three latent image patterns are formed by the image forming body (1) having one latent image pattern. Can be obtained as an image forming body (1) having a latent image pattern that can be visualized.

  As another form of the image forming body having a latent image pattern of the present invention, for example, as shown in the plan view of FIG. 2A, a paper base made of thin paper having a substantially square shape and an opacity of 50% or less. In the upper left corner of the material (43), the ratio of the line part to the non-line part is 1: 1, and the latent image pattern A (10A) consisting of parallel lines with the same pitch and non-line parts other than that. A latent image pattern formed by combining a latent image pattern (not shown in particular) and having a line ratio between the line portion and the non-line portion of 1: 1 at the upper right corner and a line having the same pitch. B (10B) and a non-latent image pattern (not shown) composed of other lines are combined to form each of the latent image patterns A and B (10A, 10B) composed of the lines. The phase of a non-latent image pattern (not shown) made up of lines is shifted by 1/2 pitch.

  As described above, the verification line pattern A having the same line ratio as that of the latent image patterns A and B (10A, 10B) formed of the lines formed at the upper two corners and the same pitch. B (20A, 20B) is formed in the lower two corners, and the verification line patterns A and B (20A, 20B) are formed in the upper two corners. , B (10A, 10B), an image forming body (1) having a latent image pattern formed in a target shape by respective fold lines AB (40AB).

  Since a thin paper having an opacity of 50% or less is used as the paper base in this case, the watermark printing layer (44) as shown in FIG. 1B is not required. For example, FIG. As shown in FIG. 2 (b), which is a cross-sectional view of the B-B plane, a latent image pattern A (10A) composed of lines on a paper substrate (43) composed of thin paper having an opacity of 50% or less. Further, the image forming body (1) having a latent image pattern in which the verification line pattern A (20A) that forms the target shape by the folding line AB (40AB) can be directly formed.

Further, as a method for visualizing the image forming body (1) having the latent image pattern shown in FIGS. 2 (a) and 2 (b), for example, a target shape with respect to a central folding line AB (40AB) in the horizontal direction. The line latent image pattern A (10A), the verification line pattern A (20A), the line latent image pattern B (10B), and the verification line pattern B (20B), For example, as shown in the perspective view of FIG. 4, a latent image pattern A (10A), a verification line pattern A (20A), and a latent image pattern composed of lines are folded at a folding line AB (40AB). When the directions of the lines of B (10B) and the verification line pattern B (20B) are aligned and overlapped, the letters “A” and “B” are seen from above by transmitted light (O) from below. Enables visual or machine reading It can be an image forming member having an image pattern (1).

  As described above, if the latent image pattern consisting of lines and the verification line pattern are folding lines and the target position is the target line direction, the number, position, and line type are limited. However, the image forming body (1) having a latent image pattern composed of an infinite number of combinations can be obtained.

  For example, as shown in FIG. 5A, the line pattern that forms the line latent image pattern A (10A), the verification line pattern A (20A), etc. It may be a line pattern (18) composed of straight lines, but is not limited to the line pattern (18) composed of these straight lines. For example, as shown in FIG. In addition, it may be a linear line pattern (18a) formed by dots, or may be a line pattern (17) consisting of wavy lines as shown in FIG. 5 (c). The line-like pattern (17) made of wavy lines can be, for example, a line-like pattern (not shown) made of wavy lines formed by dots.

  The watermark printing layer (44) formed on the paper base (42) shown in FIG. 1 (b) is, for example, a paper base by letterpress printing using a colorless printing ink mainly composed of boil oil. For example, a colorless printing ink proposed in Japanese Patent Application Laid-Open No. 02-127599 is applied to cellulose to form a watermark printed layer (44) by infiltrating the material, and to improve the drying property and the spinnability. A watermark ink containing a solid resin having a refractive index similar to that of normal temperature and a wax, animal or vegetable oil, or the like can also be used.

  These watermark inks penetrate into the paper substrate (42), make the opacity 50% or less, and make the latent image pattern visualized by the transmitted light from the back visible or machine-readable from the front It is.

  Instead of the watermark printing layer (44), a paper watermark (at the time of paper making, the thickness and density of the paper web is changed so that the portion that becomes the watermark portion has an opacity of 50% or less and can be seen through with transmitted light. In particular, a white watermark can be used. As a method of this paper watermark, in the wire part during the paper making process, a device with a water-permeable presser mesh called a dandy roll on the roll surface acts on the paper web and corresponds to the pattern provided on the dandy roll surface. A method of giving a basis weight change such as a change in thickness and density to a part of the paper web by using the unevenness is used.

Examples of the paper substrate (43) made of thin paper having an opacity of 50% or less include high-quality paper, medium-quality paper, translucent glassine paper, and imitation paper having a basis weight of about 55 g / m ² or less. It is selected as appropriate according to the application.

As described above, a single paper substrate (42) is provided with a watermark printed layer (44) or a paper watermark (not shown) that has an opacity of 50% or less, or a single paper substrate (42). Since a latent image pattern A (10A) and a verification line pattern (20) are formed on a paper base made of thin paper with a transparency of 50% or less, various types of lines are separately provided as in the past. It does not require a verification line film, makes it easy to manage the line film at a verification laboratory that performs the verification, and further increases the degree of freedom in the line shape and pitch of the latent image pattern, including design. It can be set as the image forming body (1) which has a latent image pattern which can also improve security, and its visualization method.

  In the present invention, for example, the line width of the latent image pattern A (10A) and the verification line pattern (20) shown in FIG. 1A are preferably in the range of 30 μm to 500 μm. .

  When these line widths are less than 30 μm, the reproducibility of the latent image pattern A (10A) and the verification line pattern (20) consisting of a single line is lacking in various printing and printing with an inkjet printer, etc. The design is too fine, and even if the verification line pattern is overlaid as shown in FIG. 3A, it becomes difficult to visually recognize or machine read the letter “A”. The formed latent image pattern A (10A) composed of parallel lines can be visually discerned (even when the verification universal line pattern is not overlaid) and may be easily reproduced by a copying machine. , Not very preferable.

  Furthermore, in the invention according to the third aspect, for example, the latent image pattern A (10A) formed by a parallel line and other non-latent image patterns (not shown) shown in FIG. For example, fluorescent ink or infrared absorbing ink can be used as the special ink.

Examples of fluorescent substances (pigments) that are dispersed in the former fluorescent ink and emit fluorescence at a short wavelength (around 254 nm) include, for example, Zn ₂ SiO ₄ : Mn, Ca ₂ B ₅ O ₉ Cl: Eu ²⁺ , CawO ₄ , ZnO: Zn, Y ₂ O ₂ S: Ag, YVO ₄ : Eu, Gd ₂ O ₂ S: Tb, LaO ₂ S: Tb, Y ₃ Al ₅ O ₁₂ : Ce, etc. Several types of fluorescent substances (pigments) that emit fluorescence with a long wavelength (near 340 nm) are resin solid solutions of fluorescent dyes such as aromatic heterocyclic derivatives. Methacrylic acid ester, urea / formalin resin, melamine / formalin resin, vinyl chloride, vinyl chloride / vinyl acetate copolymer, alkyd resin and their modified ones. , For example, dyes such as fluorescein, eosin, rhodamine B, rhodamine 6G, thioflavine as aromatic heterocyclic derivatives, derivatives such as diaminostilbene disulfonic acid, imidazole, coumarin, triazole, carbazole, pyridine, naphthalic acid, imidazolone, anthracene, etc. And a latent image pattern printed with these fluorescent inks can be visually confirmed or machine-read by irradiation with black light.

  In addition, as the latter infrared absorbing ink, an ink that is in accordance with a printing method (offset, gravure, letterpress, screen printing, etc.) is prepared by dissolving and dispersing an infrared absorbing material that absorbs only in the infrared wavelength region with a binder resin and a solvent. It is what.

Examples of the ink include phosphoric acid crystal powder containing phosphorus pentoxide as a main component and containing iron oxide or copper oxide or both, glass-based powder containing phosphorus pentoxide as a main component and containing Fe ₂₊ or Cu ₂₊ ions, and metal complex. Infrared absorbing materials such as cyanine, phthalocyanine, naphthalocyanine, anthraquinone, colonic methine, azleoniom, pyrylium and the like, and binders thereof include polyvinyl chloride, vinyl acetate- Examples of the solvent include vinyl chloride copolymer, polyacryl, polystyrene, polyamide, and the like, and examples of the solvent include linseed fat, kiri fat, alcohols such as toluene, acetone, isopropyl alcohol, methyl ethyl ketone, and ethylene glycol. , Flexo, offset, etc.) The above binder and solvent are selected according to the formula and the base material, and can be adjusted in consideration of viscosity, transferability, drying property, etc., and can be made into an ink containing an infrared absorbing material, and printed with these infrared ray absorbing inks. The latent image pattern can be observed on the monitor of an infrared verification machine composed of an infrared camera and a monitor for detecting an infrared absorbing material.

  In this way, a verification place that verifies the authenticity of the latent image pattern A (10A) printed with fluorescent ink that is invisible under white light or colorless infrared absorbing ink that does not contain carbon black. It is possible to obtain an image forming body (1) having a latent image pattern with higher security that cannot be visually recognized except by machine reading such as, and that cannot be reproduced with a copying machine.

An example of an image forming body having a latent image pattern according to the present invention will be described, in which (a) is a front view thereof, and (b) is a cross-sectional view of the BB plane of (a). The other example of the image forming body which has a latent image pattern of this invention is demonstrated, (a) is the front view, (b) is sectional drawing of the BB surface of (a). is there. 1 shows an embodiment of visualization of an example of an image forming body having a latent image pattern according to the present invention, in which (a) is visualization of a latent image pattern A, and (b) is latent imaging. The image pattern B is visualized, and (c) is the latent image pattern C visualized. It is a perspective view showing one embodiment of visualization of another example of an image forming body having a latent image pattern of the present invention. The example of the form of the line-shaped pattern which comprises the image forming body which has a latent image of this invention is shown, (a) is a line-shaped pattern which consists of a straight line, (b) is a straight line dotted. (C) is a line-shaped pattern consisting of wavy lines, It is a front view for demonstrating an example of the line moiré image which comprises the conventional image forming body. It is the elements on larger scale of the A section of the front view of the line moiré image shown in FIG. It is a front enlarged view for demonstrating one example which overlapped the line film on the line moire image which has a latent image part. It is a front view showing an example in which a latent image portion is visualized and appears to float when a line film is superimposed on a line moire image having a latent image portion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Image forming body which has a latent image pattern 3 ... Line moiré image 10A ... Latent image pattern A which consists of a line
10B ... Latent image pattern B consisting of lines
10C ... Latent image pattern C consisting of lines
18 ... Line-like pattern 18a consisting of straight lines ... Line-like pattern 18b consisting of straight lines as dots ... Line-like pattern 18c consisting of wavy lines ... Line-like pattern consisting of dots as wavy lines 20 ... Verification Line pattern 20A for verification Line pattern A for verification
20B ... Line pattern B for verification
30 ... Latent image part 32 ... Non-latent image part 34 ... Line film 36 ... Visual image 40A ... Folding line A
40B ... Folding line B
40C ... Folding line C
40AB ... Folding line AB
42 ... Paper base 43 ... Paper base made of thin paper 44 ... Watermark printing layer O ... Transmitted light P ... Line pitch of line film W ... Line width of line film

Claims (3)

  In at least one place on the opaque sheet-like base material, the line ratio of the line part and the non-line part is approximately 1: 1, and the line-like latent image pattern having the same pitch with each other and other lines An image forming body formed by combining a linear non-latent image pattern and having a latent image pattern in which the phase of the parallel latent image pattern and the non-latent image pattern is shifted. When the base line is folded and overlapped with the latent image pattern, the verification line pattern having a line ratio of approximately 1: 1 and the pitch substantially the same as the line-shaped latent image pattern is superimposed on the line-shaped latent image. An image pattern is formed so as to be visualized, and the latent image pattern is characterized in that the substrate at the location of the line-shaped latent image pattern and the verification line-shaped pattern is made transparent or translucent Image forming body.   A line-shaped latent image pattern having a line-to-line and non-line-line line ratio of approximately 1: 1 and having substantially the same pitch, at least in one place on a transparent or translucent sheet-like substrate In the image forming body having a latent image pattern formed by combining the line-shaped non-latent image pattern other than the line-shaped latent image pattern and the line-shaped non-latent image pattern, When a line-shaped latent image pattern and a line-shaped verification pattern having a line-line ratio of approximately 1: 1 and having the same pitch as the line-shaped latent image pattern are folded and overlapped, An image forming body having a latent image pattern, wherein the linear latent image pattern is formed to be visualized.   3. The image having a latent image pattern according to claim 1, wherein the line-shaped latent image pattern and the line-shaped non-latent image pattern are formed of a special ink that cannot be visually observed. 4. Formed body.

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