JP5023987B2 - Image forming body - Google Patents

Description

  The present invention is effective in preventing counterfeiting of securities such as banknotes, gift certificates, admission tickets, stock certificates, and printing media such as packages, product labels, and the like, and image formation for counterfeiting that is particularly difficult to copy by copying or scanning About the body.

  Counterfeit prevention measures are indispensable for securities such as gift certificates, admission tickets, cash vouchers, stock certificates, and claims. Conventionally, printed matter that can be read mechanically and optically as electronic data after use, such as gift certificates, printed matter that makes counterfeiting and forging more difficult, and does not interfere with design and appearance, or color Printed products that have been provided with anti-counterfeit measures such as printed materials that are difficult to be copied by a copy or a scanner are widely used in the market.

  As one of the printing application technologies that make counterfeiting and forging more difficult, for example, the phase is approximately ½ pitch between the latent image portion and non-latent image portion of many lines (striped parallel lines with the same pitch). When a line film of the same shape as this line is superimposed on the printed matter that has been shifted, the part (latent image) where the line is shifted becomes visible as a pattern. In addition, there is a method that uses a technique to create a latent image by shifting a sequence of neatly arranged halftone dots. When overlapping halftone dots of the same pattern, a (latent image) is displayed on the part where the halftone dots are shifted. As visible.

However, in the method using this technique, since the pattern itself is relatively simple, the latent image pattern is easily detected by operations such as image enlargement, and if it has a certain knowledge and technique, it can be easily produced. It was possible and there was a problem in terms of preventing counterfeiting. As a countermeasure, for example, Patent Document 1 discloses several types of latent lines with line patterns configured by using several types of line pitches and several types of line angles on an image forming sheet such as a single printing sheet. A technique is disclosed for forming an image and determining the authenticity of an image forming body, which requires a line sheet for visualization (for authenticity determination) on which two or more types of line patterns are formed. .
Japanese Laid-Open Patent Publication No. 2007-15120

  However, the configuration of Patent Document 1 is more complicated and difficult to counterfeit or duplicate compared to the above-described technique. However, due to high performance of scanners and the like, a fine latent image pattern with colored ink is visually recognized. There is a possibility that counterfeiting is possible. Further, in order to make it more complicated, several kinds of verification tools for authenticity determination are required, so that the authenticity determination operation becomes complicated and there is a problem that application development is limited.

  The present invention solves the problems of the prior art, and the problem is that the latent image is not easily seen by the naked eye, but also by a high-performance scanner or the like, and counterfeiting and duplication are difficult and the anti-counterfeiting effect is achieved. It is an object of the present invention to provide an anti-counterfeit printed matter that can be used for a high-quality verification tool for visualization (for authenticity determination) on which a line pattern is conventionally used for authenticity determination.

The invention according to claim 1 of the present invention is an image forming body in which an image with an embossed pattern is formed on a base material, and the embossed pattern exhibits (a) a visually recognizable pattern without using a verification tool. Visible image part and (b) a pattern that is difficult to visually recognize without using the verification tool, but is visible by combining the verification tool and combining the pattern provided on the verification tool with the embossed pattern. An image forming body comprising a latent image portion to be presented.

  Further, in the invention according to claim 2 of the present invention, the portion of the visible image is made of a concave portion or a convex portion formed in a pattern of uniform halftone dots or lines, and the latent image The portion is made of a concave portion or a convex portion formed in a pattern of halftone dots or lines that are partially shifted in phase by about ½ pitch with respect to the pattern of the portion of the visible image, and The image forming apparatus according to claim 1, wherein the verification tool is configured such that a halftone dot or a line pattern having the same phase as the pattern of the portion of the visible image is formed of ink on a transparent substrate. Is the body.

  Since the present invention is configured as described above, the following effects can be obtained. That is, according to the invention according to claim 1, the embossed plate is made of delicate halftone dots and the like, embossed by impressing and pressing the base material such as paper, and the embossed pattern is provided on the paper base material. As a result, it becomes difficult to copy a fine pattern by a copy or a scanner, and an image forming body having a high anti-counterfeit effect can be obtained. Furthermore, although it is difficult to visually recognize without using a verification tool, it is provided with a latent image part that presents a visible image by overlapping the verification tool and combining the pattern provided on the verification tool and the embossed pattern, It is difficult to recognize other than the production party.

  In addition, the image forming body of the present invention does not use ink for forming a latent image, and unlike the image expression using the uneven shape and the deviation of the ink as in the conventional “intaglio latent image printing”, the front surface is Of course, the image of the latent image is not conspicuous even when viewed at an angle from different angles, making it difficult to analyze. The latent image can also be formed by pressing it on another printed pattern or paper substrate with a watermark. It is difficult to analyze and counterfeit, and by applying a dedicated verification tool, the latent image can be visualized and authentication can be easily determined.

  Further, according to the invention described in claim 2, it is possible to use conventional printing-related equipment for the production of a plate-making pattern and the production of an embossed plate, and it has been conventionally used for authenticity determination. A line or halftone screen film can be used as an image forming body. Furthermore, it is possible to prepare a plurality of latent images, and a multi-change latent image that changes the pattern that appears when the angle at which the verification tool is applied is changed.

  Hereinafter, an image forming body according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an enlarged schematic view for explaining the change in the column of the idle pressing latent image change in one embodiment of the image forming body of the present invention. (A) is the front view which looked at the halftone dot 9 which comprises the visible image visualized as an embossed pattern from the upper part. As shown by the halftone dots existing on the cross-sectional line in the figure, the halftone dots of uniform phase forming the visible image and the halftone dots partially shifting the phase by about 1/2 pitch forming the latent image Each pattern is formed by a set of halftone dots. (B) is a cross-sectional view of the embossed plate 2 and the cross-sectional portion of the cross-sectional portion of the paper 1 which is a blank substrate, and (c) is a light transmitting part 4 and a light blocking part in the same phase as the halftone dots. 5 is a front view of the verification tool 3 formed in a stripe shape in the vertical direction. In the following, embossed halftone dots are displayed in black for the sake of explanation, but in reality they are visualized as shades of embossed patterns with a collection of halftone dots with different sizes, and can not be copied, In copying, it is the color of the substrate, that is, usually the white color of the paper.

FIG. 2 is an enlarged schematic diagram conceptually illustrating the column change of the idle pressing latent image change in the embodiment of the image forming body of the present invention described in FIG. (A) is a conceptual explanatory view of the case where the verification tool 3 is applied to the blank paper 1 and the light source 10 is on the upper side, and (b) is a front view as viewed from above through the verification tool 3. . Here, the light emitted from the upper light source 10 is visually reflected by the surface of the paper 1 as the base material through the light transmitting portion 4 of the verification tool 3, but the phase is substantially the same as the halftone dot portion having the same phase. A halftone dot portion shifted by ½ pitch causes a difference in reflectivity, resulting in a contrast between a portion that appears black and a portion that appears white, and as a result, the latent image becomes visible. In a case where there are few embossed patterns as so-called “deception patterns” used for preventing counterfeiting, the latent image pattern can be confirmed with a light source from above.

  FIG. 3 is an enlarged schematic view conceptually illustrating the vertical change of the idle pressing latent image change in the embodiment of the image forming body of the present invention described in FIG. 1 in addition to the description of FIG. 2 described above. . (A) is the conceptual explanatory drawing which looked at the case where the verification tool 3 was applied to the paper 1 which was pressed idle, and the light source 10 is the lower part, and (b) was the front view seen from the upper surface through the verification tool 3. . When there are many embossed patterns as so-called “deception” patterns used to prevent counterfeiting, it is difficult to confirm the latent image pattern with the light source from above, but the latent image pattern is confirmed with transmitted light from the light source from below. Is possible.

  The image forming body of the present invention can also prepare a plurality of latent images by using the above-described principle, and a multi-change latent image in which the pattern that emerges can be changed by changing the angle to which the verification tool is applied is also possible. . In the image forming body of the present invention, since the pattern is confirmed by the contrast due to the difference in the light reflectance or light transmittance between the visible image pattern and the latent image pattern, a clear contrast as obtained with colored ink is obtained. Although it is difficult, a vertical and horizontal two-change latent image in which two latent images are shifted by 90 degrees with respect to one latent image is desirable. In the case of the vertical and horizontal two-change latent images, if the phase of the halftone dots constituting both patterns is the same, the light transmission unit 4 and the light blocking unit 5 are formed in stripes in one direction with the same phase. It is possible to check the vertical and horizontal latent images using one tool 3.

  FIG. 4 is an enlarged schematic diagram for explaining the change in the row of the idle pressing latent image change in the embodiment of the image forming body of the present invention. (A) is the front view which looked at the halftone dot 9 which comprises the visible image visualized as an embossed pattern from the upper part, (b) is the embossed plate 2 and the said cross-sectional location of the paper 1 which is the base material pressed idle FIG. 4C is a front view of the verification tool 3 in which the light transmitting part 4 and the light blocking part 5 are formed on the stripe in the horizontal direction with the same phase as the halftone dot.

  FIG. 5 is an enlarged schematic diagram conceptually illustrating the row change as well as the column change of the idle pressing latent image change in the embodiment of the image forming body of the present invention described in the description of FIG. 1. (A) is a conceptual explanatory view of the case where the verification tool 3 is applied to the blank paper 1 and the light source 10 is on the upper side, and (b) is a front view as viewed from above through the verification tool 3. .

  FIG. 6 conceptually illustrates the row change in addition to the description of FIG. 5 described above, similar to the column change of the idling latent image change of the image forming body of the present invention described in the description of FIG. It is an expansion schematic diagram demonstrated to. (A) is the conceptual explanatory drawing which looked at the case where the verification tool 3 was applied to the paper 1 which was pressed idle, and the light source 10 is the lower part, and (b) was the front view seen from the upper surface through the verification tool 3. .

  FIG. 7 is a pattern diagram showing an image formed by imprinting the same embossed plate on a substrate and pressing it in the image forming body according to the embodiment of the present invention. (A) is a pattern diagram of the visible image 6 visualized as an embossed pattern, (b) is a pattern diagram in which one pattern 7 of a latent image that appears by applying the verification tool 3 is visualized, (c ) Is a pattern diagram in which two patterns 8 of a latent image appearing by changing the angle of the verification tool 3 by 90 degrees are visualized.

  Next, a method for producing the image forming body of the present invention will be described.

Conventional printing-related equipment can be used for producing a plate-making pattern and an embossed plate used in the present invention. A copper plate having a thickness of about 1.5 mm can be used as a material constituting the embossing plate for empty pressing. The material for the embossing plate is not particularly limited to this. For example, a metal plate such as a zinc plate, an iron plate, an aluminum plate, a nickel plate, or an engineering plastic sheet such as an acetal resin can be used. A copper plate is preferably used because it can be easily patterned using equipment.

  The above-described copper plate is subjected to patterning for forming a desired visible image and latent image using a laser engraving method or a corrosion method to obtain an embossed plate. In addition, it is also possible to carry out chromium plating on the surface from the durability of the plate, the peelability from the substrate, and the like. As the shape of the embossed plate, either a relief plate or an intaglio plate can be used, but in order to imprint a delicate pattern and transfer the shape of the embossed plate to the substrate, the relief plate is desirable. Letterpress is preferred.

  The depth or pattern height of the embossed plate is 0.03 mm to 0.15 mm. If the height difference of the concavo-convex pattern is smaller than 0.03 mm, the visibility of the visible image itself becomes low, and the latent image becomes unclear even if it is visualized. Further, setting the height difference of the concavo-convex pattern to 0.15 mm or more requires equipment having a large pressure. Furthermore, if this height difference is set to 0.15 mm or more, a three-dimensional lift pattern is applied to a sheet of paper that is normally used as a base material, and damage such as tearing is caused, and a deep pattern is formed. In this case, the phase deviation is easily recognized by the shadow, which is not preferable.

  The pitch of halftone dots or lines is 0.05 mm to 2.5 mm. If the pitch is less than 0.05 mm, it is difficult to reproduce the image even when a high pressure is applied, and the image has a low contrast. When the pitch exceeds 2.5 mm, the shift of the halftone dot pattern becomes easy to visually recognize, the presence of the latent image is read, and the forgery prevention effect is lowered. Although it depends on the complexity of the image to be used and the base material to be idled, it is generally recommended that the width of the light transmitting part and the light blocking part of the verification tool be 0.15 mm with a pitch of 0.3 mm. The phase shift for forming the latent image can be used in the range of 1/4 to 3/4, but 1/2 is suitable for developing a latent image with high contrast.

  The image forming body of the present invention is formed by stamping on a base material such as paper and pressing it with the embossed plate described above. The substrate is not particularly limited as long as it can be pressed and processed unevenly, such as paper media such as paper used for securities or packaging, paperboard, etc., plastic, etc. Can be widely applied. This unevenness processing method can be selected as appropriate in consideration of the area of the pattern, the material of the base material, the quantity to be produced, etc., and can also be a flat press or a rotary press, and a heating press is not excluded.

  In the image forming body of the present invention produced as described above, only the embossed pattern is visualized on the surface as shown in FIG. Here, as the verification tool, apply a verification tool that has a halftone dot or line pattern with the same phase as the pattern of the visible image portion of the embossed pattern formed on a transparent substrate with ink. Thus, by combining the pattern provided on the verification tool and the embossed pattern, a latent image having a visible pattern is visualized.

The image forming body of the present invention can lift (make visible) a pattern (character or image) using a concave or convex pattern not related to color or ink. Therefore, the degree of freedom of design is greatly improved as compared with the conventional technology, and it is possible to use not only for prevention of counterfeiting but also for authenticity determination. In addition to lotteries and trading cards, it can be applied to publications such as children's books and educational materials that require design and uniqueness. Also, it has great industrial applicability because it can be developed as the latest sales promotion tool by making use of the game characteristics that do not know where characters and images are hidden.

The enlarged schematic diagram explaining the change of the column of a blank pushing latent image change of one Embodiment of the image forming body of this invention. FIG. 3 is an enlarged schematic diagram conceptually illustrating a change in a column of a change in a latent image when an image forming body according to an embodiment of the present invention is used. FIG. 4 is an enlarged schematic diagram conceptually adding and explaining a change in a column of a latent push latent image change in an embodiment of the image forming body of the present invention. The enlarged schematic diagram explaining the change of the row | line | column of an idling latent image change of one Embodiment of the image forming body of this invention. FIG. 3 is an enlarged schematic diagram conceptually illustrating a row change of a blank push latent image change in an embodiment of the image forming body of the present invention. FIG. 4 is an enlarged schematic diagram conceptually adding and explaining a change in a row of idle pressing latent image changes in an embodiment of the image forming body of the present invention. The pattern figure showing the image formed on the base material in one Embodiment of the image forming body of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base material, paper 2 ... Embossed plate 3 ... Verification tool 4 ... Light transmission part 5 ... Light beam blocking part 6 ... Visible image 7 ... Latent image (1 pattern) 8 ... latent image (2 patterns) 9 ... halftone dot 10 ... light source

Claims (2)

An image forming body in which an image by an embossed pattern is formed on a base material, and the embossed pattern is (a) a portion of a visible image that presents a visually observable pattern without using a verification tool, and
(B) A portion of a latent image that presents a visible pattern by overlapping the verification tool and combining the pattern provided on the verification tool and the embossed pattern, which is difficult to visually recognize without using the verification tool;
An image forming body comprising:   The portion of the visible image is made of a concave portion or a convex portion formed in a pattern of either halftone dots or lines of uniform phase, and the portion of the latent image is the pattern of the portion of the visible image. In contrast, it is made of a concave portion or a convex portion formed in a pattern of halftone dots or lines that are partially shifted in phase by about ½ pitch, and the verification tool includes a portion of the visible image. The image forming body according to claim 1, wherein a halftone dot or a line pattern having the same phase as the pattern is formed on a transparent substrate with ink.