JP2021172032A - Copy restraining printed matter - Google Patents

Abstract

To provide a copy restraining printed matter capable of restraining copying carried out by various copy machines.SOLUTION: A copy restraining printed matter 100 is made by printing formation of a latent image 10 and a background thereof 20 in a butting manner. The latent image 10 is formed by a large number of lines 11. The lines constituting the latent image are formed by arranging fine dots having a certain diameter, and a concentration is represented by an area occupied by these dots. A central region 111 of each of the lines 11 has a high concentration, and the concentration becomes lower as approaching a circumference of the line.SELECTED DRAWING: Figure 2

Description

The present invention relates to copy-checked printed matter.

The copy check printed matter is generally formed by printing and forming a latent image and its background by tweezers. In this printed matter, it is difficult to distinguish the latent image from its background and recognize it. However, when this printed matter is copied, the latent image is visualized, and it becomes easy to distinguish and recognize this latent image from the background. Therefore, it is possible to restrain the act of copying and forging printed matter, and it is used for, for example, bonds and various certificates having economic value.

Many types of such copy-checked printed matter are known. For example, Patent Documents 1 to 5 relate to copy-checked printed matter.

Japanese Patent No. 5957861 Japanese Unexamined Patent Publication No. 6-262893 Japanese Unexamined Patent Publication No. 6-199085 Jikkenhei 6-71156

In this way, research and development on copy-checked printed matter continues day and night, but on the other hand, copy technology is also advancing and diversifying. Therefore, although it is possible to prevent copying by a specific copier, it may not be possible to prevent copying by another type of copier.

Therefore, an object of the present invention is to provide a copy-checking printed matter that can check copying by various copiers.

That is, the invention according to claim 1 is a printed matter obtained by printing and forming a latent image and a background thereof by removing hairs, and the copy restraint printed matter in which the latent image is visualized by copying.
The latent image is composed of a large number of lines.
The line forming the latent image is composed of fine dots arranged, and the density is high in the central region of the line and decreases as it approaches the peripheral edge of the line.

Next, the invention according to claim 2 is the copy-checking printed matter according to claim 1, wherein the diameter of the dot is constant and the density is expressed by the area occupied by the dot.

Next, the invention according to claim 3 is the copy-checking printed matter according to claim 2, wherein the area occupied by the dots in the central region is 5% or more larger than the area occupied by the dots in the peripheral region. be.

Next, the invention according to claim 4 is the copy-checking printed matter according to any one of claims 1 to 3, wherein the diameter of the fine dots is 0.05 mm or less.

Next, the invention according to claim 5 is any of claims 1 to 4, wherein the background is composed of a large number of lines, and the lines constituting the background are lines having no change in density. It is a copy-checking printed matter described in Crab.

Next, the invention according to claim 6 is the copy-checking printed matter according to claim 5, wherein the width of the line forming the latent image is 2 to 10 times the width of the line forming the background. be.

Next, the invention according to claim 7 is the copy-checking printed matter according to claim 5 or 6, wherein the width of the line constituting the background is 0.25 to 1.00 mm.

Next, the invention according to claim 8 is characterized in that the area occupied by the dots in the central region of the line constituting the latent image is 12 to 20%, and the area occupied by the dots in the peripheral edge is 1 to 10%. The copy-checked printed matter according to claim 7.

Next, the invention according to claim 9 is characterized in that the line forming the background and the line forming the latent image form one continuous line. It is a copy check printed matter described in any one of.

The copy-checked printed matter of the present invention is configured by arranging fine dots, and is configured so that the density is high in the central region of the line and decreases as it approaches the peripheral edge of the line. As described above, there are various copiers, but in each copier, there is a region that cannot be copied between the central region with high density and the peripheral region with low density, and the region closer to the periphery than this region. Cannot be copied. Therefore, when the copy-checked printed matter is copied, the density of the latent image decreases. On the other hand, since the background is copied without decreasing its density, the contrast between the copied latent image and the background becomes high, and the latent image can be easily recognized. And, for this reason, it is possible to strongly restrain the forgery by copying.

FIG. 1 relates to a specific example of the present invention, FIG. 1 (a) is an explanatory diagram thereof, and FIG. 1 (b) is an explanatory diagram of a copy. FIG. 2 is an explanatory view of a latent image and a background of a specific example of the present invention.

Hereinafter, specific examples of the present disclosure will be described with reference to the accompanying drawings. FIG. 1A is an explanatory diagram of a copy-checked printed matter according to a specific example of the present invention.

As can be seen from FIG. 1A, the copy-checking printed matter 100 is a print-formed form of the latent image 10 and the background 20. In this example, the latent image 10 is the character "copy". Then, the latent image 10 and the background 20 are arranged by pulling out hair without leaving a gap between them. Further, the density of the latent image 10 and the density of the background 20 are configured to be substantially equal. In this way, since the latent image 10 and the background 20 having substantially the same density are arranged without leaving a gap between them, that is, they are arranged in a pull-out manner, the latent image 10 can be recognized by distinguishing them by macroscopic observation. It is difficult.

The latent image 10 is configured by arranging a large number of lines, and there is a blank portion without printing between the lines. Further, the background 20 is also configured by arranging a large number of lines, and there is a blank portion without printing between the lines. As described above, the latent image 10 and the background 20 are both composed of a large number of lines arranged with a blank portion in between, but the lines constituting the latent image 10 and the lines forming the background are different types. It is a line, and the lines that make up the background are reproduced as they are by copying, but the lines that make up the latent image change. FIG. 1B shows a copy obtained by copying. In this way, the density of the latent image 10 is reduced, and a clear contrast appears between the latent image 10 and the background 20.

As shown in FIG. 2, the line 11 constituting the latent image 10 is formed by randomly arranging fine dots having the same diameter, and the density is expressed by the area occupied by the dots. Such a density expression method is called an FM (Frequency Modulation) screen method in the printing industry, and is a well-known density expression method.

The line 11 constituting the latent image 10 is configured such that the area occupied by the dots in the central region of the line 11 is high and decreases as it approaches the peripheral edge of the line. Therefore, its concentration is also high in the central region and decreases as it approaches the periphery of the line. Since the line 11 constituting the latent image 10 is formed by both the high density region and the low density region in this way, the density of the latent image 10 is configured to be substantially equal to the density of the background 20, and the latent image 10 by macroscopic observation is observed. Can be difficult to recognize. On the other hand, the area occupied by the dots (that is, the density) is high in the central region and decreases as it approaches the peripheral edge, and it is not possible to copy between the central region and the peripheral edge using any of the copiers. Since there is an area, it is possible to visualize the latent image 10 by copying, and it is possible to check forgery.

In this example constitutes a line 11 which constitutes the latent image 10 in the central region 11 ₁ and the central region 11 disposed on both sides of ₁ and the peripheral region 11 _2. When configured in this manner the central region 11 ₁ and the central region 11 disposed on both sides of ₁ and the peripheral region 11 _2, 1-10% of the area occupied by the dots in the peripheral region 11 ₂ (preferably 3 to 6%), the area occupied by the dots in the central region 11 ₁ 12 to 20% (preferably it is desirable that the 12 to 16%). Since the area occupied by the dots in the peripheral region 11 ₂ resulting in increased overall concentration of this range is larger than the dots, the dot is not easily disappear. If the area occupied by the dots in the peripheral region 11 ₂ is less than this range, the concentration of the case narrow linewidth b0 below dots resulting in overall thinner. Since the area occupied by the dots in the central region 11 ₁ resulting in increased overall concentration of this range is larger than the dots, the dot is not easily disappear. The area occupied by the dots in the central region 11 ₁ is too thin is smaller than this range and density, not balanced by a line 21

It is also possible to place the intermediate region between these central region 11 ₁ and the peripheral region 11 _2. Area when placing an intermediate region between the central region 11 ₁ and the peripheral region 11 _2, the area occupied by the dots in the intermediate region, occupied by the dots in the area and the peripheral area 11 ₂ occupied by the dots in the central region 11 ₁ Must be between. Of course, the concentration highest in the central region, next highest in the middle region, low in the peripheral region 11 _2. A plurality of intermediate regions may be provided.

If the diameter of the dots forming the lines forming the latent image 10 is too large, the dots may be reproduced as they are by copying. Also, if it is too small, it will be difficult to obtain a sufficient concentration. In order to avoid this, it is desirable to use dots having a diameter of 0.005 to 0.1 mm, preferably 0.05 mm or less. In the 150-line / inch screen, the diameter of the halftone dots is 0.032 to 0.042 mm. Further, in the screen of 211 wires / inch, the diameter of the halftone dots is 0.02 to 0.03 mm. By making a plate using a screen of 150 lines / inch or a screen of 211 lines / inch in this way, it is possible to print the lines 11 constituting the latent image 10. The shape of the dots may be a round shape, an elliptical shape, a polygonal shape, or the like. In this case, the maximum diameter of halftone dots is used.

Incidentally, in this way differs from the central region 11 ₁ and the peripheral region 11 ₂ and the concentration different line 11, line 21 constituting the background is a line formed by printing a uniform density without density change. Therefore, it can be reproduced without reducing the density by copying.

As described above, the latent image 10 and the background 20 are both composed of a large number of lines (lines 11 constituting the latent image 10 and lines 21 constituting the background 20), but the latent image is observed by the naked eye. In order to make it difficult to recognize the 10, it is desirable that the lines 11 forming the latent image 10 and the lines 21 forming the background 20 form one continuous line. That is, one line is a line 21 whose density does not change in the background 20, and when this line is extended and enters the latent image 10, it becomes a line 11 formed by arranging dots. .. In this example, the line 11 forming the latent image 10 and the line 21 forming the background 20 are both linear, but the present invention is not limited to this, and the line 21 may be curved.

Since the lines 11 forming the latent image 10 and the lines 21 forming the background 20 form one continuous line, the lines 21 forming the background 20 and the blank portion 22 between them The pitch a composed of is equal to the pitch composed of the line 11 forming the latent image 10 and the blank portion 22 between them. The pitch a is preferably 0.25 to 1 mm. If the pitch a is larger than this range, the space between the lines becomes wide and it becomes difficult to compose the character (it does not become a character). If the pitch a is smaller than this range, the distance between the lines becomes narrow, so that there is a high possibility that the lines will be crushed during copying.

By the way, since the density of the latent image 10 and the density of the background 20 are substantially equal to each other, making it difficult to recognize the latent image 10, the width b0 of the line 11 constituting the latent image 10 is set to the width of the line 21 forming the background 20. It is desirable that the value is 2 to 10 times that of c. The width c of the line 21 constituting the background 20 is, for example, 0.025 to 0.2 mm. If the line width c is larger than this range, it tends to remain after copying, but since the density of the dots must be increased according to the thickness of the dots, the dots are hard to disappear. If the line width c is smaller than this range, it disappears after copying. The width b0 of the line 11 constituting the latent image 10 is, for example, 0.15 to 0.95 mm. If the line width b0 is larger than this range, the white portion between the dots becomes narrow and difficult to disappear. If the line width b0 is smaller than this range, the dots cannot be sufficiently blurred, and it becomes difficult to erase the dots.

Further, in order to visualize the latent image 10 when copying with the difficult recognition of the latent image 10, the width b1 of the central region 11 ₁ 0.0025~0.5mm (preferably 0.01 to 0.1 mm), It is desirable that the width b3 of the blank portion between the lines 11 constituting the latent image 10 is 0.0125 to 0.6 mm. If the line width b1 is larger than this range, the density of the dots increases as a whole, so that the dots are hard to disappear. If the line width b1 is smaller than this range, the density difference from the line 21 is visually recognized in the state before copying, and the possibility that the latent image is visible increases. If the width b3 of the blank portion is larger than this range, the width of b0 becomes too large, and if it is smaller than this range, the width of b0 becomes too small.

As the copy check printed matter 100, the printed matter of the design of FIG. 1 was prepared under 30 kinds of conditions (Examples 1 to 30) shown in Table 1. The diameter of the dots forming the line 11 forming the latent image 10 was set to 0.032 to 0.042 mm.

The visibility of the latent image before copying and the visibility of the latent image after copying were evaluated with respect to the obtained copy restraint printed matter 100 of Examples 1 to 30. Five copiers were used: Canon C5255R, RICOH MPC6502, Kyocera 3050ci, SHARP MX3610DS, and FUJI XEROX multi-copier. In addition, three copy conditions were performed: color copy (normal mode, photo mode, map mode). The visibility after copying was visually evaluated for each example with a total of 15 sheets copied in the above-mentioned five copiers and three modes. Table 1 shows an evaluation of the visibility of the latent image before copying and an evaluation of the visibility of the latent image after copying (comprehensive evaluation of 15 copies of each example).

In each case, the latent image was not visible before copying, and the latent image was visible after copying. Among them, Examples 1 to 14 have a good balance between the hiding property of the latent image before copying and the visibility of the latent image after copying, and Examples 4 and 7 are particularly excellent.

Although the present invention has been described above on the premise that the base is plain, it goes without saying that the base may be colored. In this case, when the image is copied, a part of the latent image 10 is not copied and the density of the latent image decreases, so that the latent image 10 looks different from the background 20 in color. Therefore, it is possible to check the copy.

Further, a fine pattern or the like may be printed as a base. Also in this case, the latent image 10 looks different from the background 20 depending on the copy. Therefore, it is possible to strongly restrain the copy as in the case where the base is plain or colored.

100: Copy check printed matter 10: Latent image 11: Lines that make up the latent image 11 ₁ : Central area 11 ₂ : Peripheral area 12: Blank area 20: Background 21: Lines that make up the background 22: Blank area a: Consists of the background Line pitch b0: Width of the line constituting the latent image 10 b1: Width of the central region b3: Width of the blank portion c: Width of the line constituting the background

Claims (9)

In a copy-checked printed matter in which a latent image and its background are printed and formed by tweezers, and the latent image is visualized by copying.
The latent image is composed of a large number of lines.
A copy-checked printed matter characterized in that the lines constituting this latent image are composed of fine dots arranged, and the density is high in the central region of the line and decreases as it approaches the periphery of the line. The copy-checking printed matter according to claim 1, wherein the diameter of the dots is constant, and the density is expressed by the area occupied by the dots. The copy-checked printed matter according to claim 2, wherein the area occupied by the dots in the central region is 5% or more larger than the area occupied by the dots in the peripheral region. The copy-checking printed matter according to any one of claims 1 to 3, wherein the diameter of the fine dots is 0.05 mm or less. The copy-checking printed matter according to any one of claims 1 to 4, wherein the background is composed of a large number of lines, and the lines constituting the background are lines having no change in density. The copy-checking printed matter according to claim 5, wherein the width of the line forming the latent image is 2 to 10 times the width of the line forming the background. The copy-checking printed matter according to claim 5 or 6, wherein the width of the line constituting the background is 0.25 to 1.00 mm. The copy-checking printed matter according to claim 7, wherein the area occupied by the dots in the central region of the line constituting the latent image is 12 to 20%, and the area occupied by the dots in the peripheral edge is 1 to 10%. The copy-checking printed matter according to any one of claims 5 to 8, wherein the line forming the background and the line forming the latent image form one continuous line.

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