JP3909238B2 - Printed matter with micropattern - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a printed matter having a micropattern in which the entire portion provided with a micropattern in a planar shape can be seen only as a monotonous solid portion in a normal viewing state.
[0002]
[Prior art]
Conventionally, in order to prevent forgery of securities and the like, printed materials in which fine characters, figures, etc. (hereinafter referred to as micropatterns) that cannot be copied or reproduced by a copying machine or a scanner are arranged in a line are known.
[0003]
The micropatterns are used in printed matter such as underline of characters, straight ruled lines, and wavy ruled lines, but if this part is magnified and observed using a magnifying glass, each part is visible. The shape of the micro pattern is recognized. For example, a bank with a serial number brown or dark green is printed with a row of micro patterns such as “NIPPON GINKO” so as to constitute a part of the linear portion as described above.
[0004]
When this micro pattern is duplicated with a copier or scanner, it will be crushed if the pattern making line is thick or the line density is high, and conversely if the pattern making line is thin, it will be blurred and accurate. It is not reproduced as a pattern. In other words, when the micropattern portion of the copied printed material is enlarged and examined, it is understood that the printed material is a copied printed material.
[0005]
[Problems to be solved by the invention]
In contrast to the above-described prior art, the present inventors considered that the micropatterns 2 are assembled in a planar shape so that only the solid part can be seen with the naked eye. It was found to produce.
[0006]
Characters, figures, and the like that are micropatterns 2 differ in the area of the image line portion formed by the image in the formation region, that is, the ratio of the area on which ink is placed, depending on the shape. Therefore, when a large number of micropatterns 2 are assembled into a planar shape as described above, there are two or more types of micropattern assembly regions with different printed surface brightness recognized by the naked eye, that is, solid portions having different tones. A case occurs. For example, as shown in FIG. 2, when a large number of micropatterns 2 made up of black “M”, “I”, “C”, “R”, and “O” characters are assembled for each character, The micro pattern assembly region 1 of “M” is dark, and the micro pattern assembly region 1 of “I” appears to be formed by five extremely thin solid portions.
[0007]
As a result, not only does it look bad, but it is easy to see that some kind of work is done on that part, so it tells the person who intends to counterfeit what to overcome. That is, there is a problem that the effect of preventing forgery is poor.
[0008]
Accordingly, an object of the present invention is to solve the above problems and provide a printed matter having a micropattern in which the entire portion provided with the micropattern in a planar shape can be seen only as a monotonous solid portion in a normal viewing state. is there.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the printed matter having the micropattern of the present invention has two types of micropattern assembly regions having a large number of micropatterns assembled in a plane and having different printed surface brightness recognized by the naked eye. A combination of the above, a printed matter formed in succession on the surface of the base sheet, and the average L ^* value of the darkest micropattern assembly region in the L ^* a ^* b ^* color system described in JIS Z 8729 Background portions other than the micropattern in the micropattern assembly region where the ΔL ^* value exceeds 15 at least so that the difference ΔL ^* value between each of the average L ^* values of the other micropattern assembly regions is 15 or less. Each of the correction patterns for filling in is provided.
[0010]
In the above configuration, the average L ^* value of the darkest micropattern assembly region in the L ^* a ^* b ^* color system described in JIS Z 8729 and the average L of each of the other micropattern assembly regions ^A correction pattern for filling a background portion other than the micropattern is provided for each micropattern assembly region where the ΔL ^* value exceeds 10 so that the difference ΔL ^* value from the ^* value is 10 or less. .
[0011]
In each of the above-described configurations, at least one micropattern assembly region has a portion in which micropatterns are regularly arranged in a mesh pattern with the same shape and a constant fine pitch.
[0012]
Further, at least two or more micropattern assembly regions have a portion in which the micropatterns are regularly arranged in the same shape and at a constant fine pitch in the same region, and these micropattern assembly regions have at least 2 micropattern assembly regions. You may make it have the arrangement | sequence state of a seed | species.
[0013]
Further, in the configuration relating to the arrangement of the micro patterns, the correction pattern is a plain network using an FM screen.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the printed matter having the micropattern of the present invention will be described in detail with reference to the drawings.
[0015]
FIG. 1 is a schematic diagram showing an example of a portion provided with a micropattern on the surface of a printed matter having a micropattern according to the present invention and an enlarged content thereof, and FIG. 2 is a schematic diagram showing a comparative example without a correction pattern. FIG. 3 is a plan view showing a printed material used in a comparative experiment of a portion provided with a micropattern on the surface of FIGS. 1 and 2, and FIG. 4 shows a lens sheet disposed on the print having the micropattern according to the present invention. FIG. 5 is a schematic diagram for explaining a virtual image enlarged in FIG. 4. In the figure, 1 is a micropattern assembly area, 2 is a micropattern, 3 is a correction pattern, 4 is a white card substrate, 5 is a corrected pattern, 6 is an uncorrected pattern, 7 is a transparent substrate, and 8 is convex The light condensing element, 9 is a lens sheet, 10 is a printed matter having a micropattern, and 11 is an enlarged virtual image.
[0016]
The printed matter 10 having the micropatterns of the present invention has a large number of micropatterns 2 that have a large number of micropatterns 2 assembled in a planar shape and have two or more types of micropattern assembly regions 1 with different brightness on the printed surface recognized by the naked eye. In the printed matter formed on the surface of the base sheet, the brightness of the color between the micropattern gathering regions 1 is set so that the entire portion provided with the micropattern 2 can be seen only as a monotonous solid portion in a normal viewing state. The difference between the two is minimized. Specifically, at least the micropattern assembly region 1 having a lightness that is too low was corrected by providing a correction pattern 3 that fills the background portion other than the micropattern 2.
[0017]
The micro pattern 2 in the present invention is a fine character (in this case, also referred to as a micro character), a figure or the like that cannot be reproduced or reproduced by a copying machine or a scanner, and may be a complicated one such as a logo, a mark, or an emblem. included. In FIG. 1, each character of “M”, “I”, “C”, “R”, and “O” is a micro pattern 2. The micropattern assembly region 1 having a large number of micropatterns 2 assembled in a planar shape can be seen only as a solid part at first glance. However, in the state where the correction pattern 3 is not provided, the brightness of the printed surface recognized by the naked eye. There are two or more types of micropattern assembly regions 1 having different sizes, that is, solid portions having different tones.
[0018]
The lightness of the color is expressed as an average value obtained by measuring the L ^* a ^* b ^* color value index L ^* value of each micropattern assembly region 1 with a color difference meter according to the measurement method described in JIS Z 8729. did. Then, when 20 subjects were tested to determine how much the brightness difference is recognized as a monotonous solid portion, the average L ^* value of the darkest micropattern assembly region 1 and other micropattern assembly regions 1 When the difference ΔL ^* value from each of the average L ^* values according to the above is less than 15, more than half of the people recognized that the ΔL ^* value 15 is used as a reference when the correction pattern 3 is provided. , provided a correction pattern 3 as the micro pattern set region 1 at least [Delta] L ^* value is more than 15 [Delta] L ^* value of 15 less.
[0019]
In the above test, the difference ΔL ^* value between the average L ^* value of the darkest micropattern assembly region 1 and the average L ^* value of each of the other micropattern assembly regions 1 is within 10 Since all the persons recognized as a monotonous solid part, this ΔL ^* value of 10 is used as a reference when providing the correction pattern 3, and the ΔL ^* value is at least for the micropattern assembly region 1 in which the ΔL ^* value exceeds 10. It is preferable to provide the correction pattern 3 so as to be within 10 because the object of the present invention can be achieved more reliably.
[0020]
Note that the correction by the correction pattern 3 described above is to read the difference from the darkest micropattern assembly region 1 from the area calculation of the background portion, and to calculate the plain network corresponding to the inverse difference from the darkest micropattern assembly region 1 individually. Lightness adjustment is performed by a method of printing by embedding in the background portion of the micropattern assembly region 1. Here, the plain network refers to a halftone dot aggregate having uniform brightness with no gradation.
[0021]
Further, the correction pattern 3 is not limited to the plain network as long as the brightness adjustment as described above can be performed. For example, solid printing may be performed using special color ink.
[0022]
By the way, the printed matter 10 having the micro pattern is formed by copying the printed matter in any case where the solid portion is constituted by the set of the micro patterns 2 as in the present invention or the line portion is constituted as in the prior art. If the shape of the micropattern 2 is enlarged with a magnifying glass or the like and the shape of the micropattern 2 is examined, it can be determined whether or not the printed matter is a duplicate. However, there is a possibility that the shape of the micropattern 2 may be imitated. is there. Therefore, in order to make the authenticity determination easier and more reliable, it is conceivable to use decoration means (see Japanese Patent Application Laid-Open No. 2001-55000) for obtaining an enlarged dot drawing pattern using the moire phenomenon for the micropattern. Specifically, in at least one micropattern assembly region 1, the micropatterns 2 have portions that are regularly arranged in a mesh pattern with the same shape and a constant fine pitch (see FIG. 1). In this case, the authenticity determination is performed by using a transparent sheet (hereinafter referred to as a lens sheet) in which convex condensing elements 8 are provided in the same arrangement as the micropatterns 2 arranged on the surface of the transparent substrate 7. By arranging the convex light condensing elements 8 in a certain arrangement with the crossing angle shifted with respect to the micropattern in the certain arrangement of the printed material (see FIG. 4), an enlarged virtual image 11 of the micropattern 2 appears ( It is determined whether or not the printed material has been duplicated due to the generation of the virtual image. Therefore, forgery is more difficult because a virtual image cannot be generated only by imitating the shape of the micropattern.
[0023]
It should be noted that at least one pair of the convex condensing element 8 of the lens sheet 9 and the printed micropattern 2 is completely overlapped in the vertical direction, and another micropattern 2 that is equidistant from the overlapping micropattern 2 is present. The micropattern 2 corresponding to the other micropattern 2 is shifted radially outward from the overlapping micropattern 2 as the center, and the micropattern outside the center micropattern 2 is shifted to the outside. When the convex condensing element 8 of the lens sheet 9 and the micropattern 2 of the printed material are arranged so that the width shifted by 2 is increased, the enlarged virtual image 11 of the micropattern 2 floats and appears in front of the actual position. Can be issued. In addition, when the radiation structure is shifted inward, the virtual image appears after being submerged from the actual position. Therefore, in this case, forgery is more difficult than a printed matter that can simply generate the enlarged virtual image 11 of the micropattern 2.
[0024]
Further, when a virtual image of the enlarged micropattern 2 is visually recognized, in at least two or more micropattern assembly regions 1, the micropatterns 2 are regularly arranged in a uniform mesh pattern with the same shape and a constant fine pitch. It is more preferable in terms of the anti-counterfeit effect if the micropattern assembly region 1 has at least two kinds of arrangement states. In other words, if there are those in which the pitch differs between regions where virtual images can appear, the number of lens sheets 9 is required by the number of types of pitches in order to confirm all virtual images. Further, if there is an object whose arrangement direction is rotated and shifted between areas where virtual images can appear, it is necessary to reposition the lens sheet 9 by the number of types of rotations in order to confirm all the virtual images. .
[0025]
In addition, when the virtual image of the micropattern 2 enlarged as described above is visually recognized, it is preferable that the plain network of the correction pattern 3 is an FM screen. This is because the FM screen expresses the gradation expression by the number of minute dots, unlike the AM screen that expresses the gradation expression as used in normal printing by the size of the halftone dots. No moire occurs even when 9 is placed. Therefore, when the virtual image of the enlarged micro pattern 2 is confirmed, the moire of the background portion does not get in the way.
[0026]
【Example】
On the outer periphery of the white card base 4 having a thickness of 1.3 mm, micropatterns 2 made of black characters “M”, “I”, “C”, “R”, and “O” are arranged in 6 columns and 12 rows, respectively. The prints were arranged at intervals of 18, 22, 18, 22, 18 μm in order. As shown in FIG. 2, the printed matter having the micropattern 2 is formed of five different rectangular solid portions in which the “M” micropattern assembly region 1 is dark and the “I” micropattern assembly region 1 is extremely thin. It looks like.
[0027]
Therefore, the stage of design design is such that a slightly darker FM screen is formed in the micro pattern collection area 1 of “I” and a slightly thinner FM screen is formed in the micro pattern collection area 1 of “C”, “R”, and “O”. Then, by providing non-grayscale plain network data such as 25%, 5%, 5%, 7%, etc. on the background of each micropattern assembly area 1, "I", "C", "R" The lightness difference ΔL ^* value of the “O” micropattern assembly region 1 with respect to the “M” micropattern assembly region 1 is set to 15 or less so that it appears to be formed of one rectangular solid portion. (See FIG. 1).
[0028]
The corrected pattern 5 (pattern a) of FIG. 1 and the uncorrected pattern 6 (pattern b) of FIG. 2 are formed side by side on the white card base 4 as shown in FIG. The subject asked, “Where is the anti-counterfeit pattern? ”Pointed out that“ they are in the solid part of pattern b ”, but less than the majority pointed out that“ it is also in the part of pattern a ”.
[0029]
When a lens sheet provided with a plurality of convex condensing elements at a predetermined interval is superimposed on the transparent pattern 5 on the corrected pattern 5 in FIG. 1, “M” and “M” that cannot be visually recognized by the naked eye. Each of the micropatterns 2 of “I”, “C”, “R”, and “O” was enlarged about 15 times and emerged as one word “MICRO”.
[0030]
【The invention's effect】
Since the printed matter having the micropattern of the present invention has the above-described configuration, it has the following effects.
[0031]
That is, specifically, by providing correction patterns for filling background portions other than the micropatterns for several micropattern assembly regions, the difference in color brightness between the micropattern assembly regions is minimized. Therefore, the printed matter having the micropattern of the present invention has a good appearance because the entire portion provided with the micropattern in a planar shape can be seen only as a monotonous solid portion in a normal viewing state. In addition, since it is not easy to know which part is crafted for a person who attempts to counterfeit, the counterfeit prevention effect is excellent.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an embodiment of a portion provided with a micropattern on the surface of a printed matter having a micropattern according to the present invention and the enlarged contents thereof.
FIG. 2 is a schematic diagram illustrating a comparative example in which no correction pattern is provided.
FIG. 3 is a plan view showing a printed matter used in a comparative experiment of a portion where a micropattern is provided in the planar shape of FIGS. 1 and 2;
FIG. 4 is a cross-sectional view showing a state in which a lens sheet is arranged on a print having a micropattern according to the present invention.
5 is a schematic diagram illustrating a virtual image enlarged in FIG. 4. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Micro pattern gathering area | region 2 Micro pattern 3 Correction pattern 4 White card | curd base material 5 Corrected pattern 6 Uncorrected pattern 7 Transparent substrate 8 Convex condensing element 9 Lens sheet 10 Printed matter 11 with a micro pattern Enlarged virtual image

Claims (5)

A printed matter having a large number of micropatterns assembled in a planar shape and a combination of two or more micropattern assembly regions with different brightness on the printed surface recognized by the naked eye, and formed in succession on the surface of the base sheet. ,
The difference ΔL between the average L ^* value of the darkest micropattern assembly region in L ^* a ^* b ^* color system described in JIS Z 8729 and the average L ^* value of each of the other micropattern assembly regions ^* A micropattern characterized in that a correction pattern that fills a background portion other than the micropattern is provided for each micropattern assembly region where at least ΔL ^* value exceeds 15 so that all values are within 15 Printed matter. The difference ΔL between the average L ^* value of the darkest micropattern assembly region in L ^* a ^* b ^* color system described in JIS Z 8729 and the average L ^* value of each of the other micropattern assembly regions ^{2. The} micropattern according to claim 1, wherein a correction pattern that fills a background portion other than the micropattern is provided for each micropattern assembly region in which at least ΔL ^* value exceeds 10 so that all ^* values are within 10. Printed matter. The printed matter having the micropattern according to claim 1 or 2, wherein at least one micropattern assembly region has a portion in which the micropattern has the same shape and is regularly arranged in a mesh pattern at a constant fine pitch. . At least two or more micropattern assembly regions have portions in which the micropatterns are regularly arranged in the same shape and at a constant fine pitch in the same region, and these micropattern assembly regions include at least two types of micropattern assembly regions The printed matter having the micropattern according to claim 3, which has an array state. The printed matter having a micro pattern according to claim 3, wherein the correction pattern is a plain network using an FM screen.

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