Copy control printouts

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

[Technical field]

[0001] The present invention relates to copy-deterrent printed matter. [Background technology]

[0002] A copy-deterrent printed matter is generally formed by printing and forming a latent image and its background by matching them with tweezers. In this type of printed matter, it is difficult to distinguish and recognize the latent image from its background. However, when this printed matter is copied, the latent image becomes visible, making it easier to distinguish and recognize the latent image from its background. This makes it possible to deter the act of copying and counterfeiting printed matter, and is used, for example, for bonds and various certificates of economic value.

[0003] Many types of such copy-deterrent printed matter are known, and for example, Patent Documents 1 to 5 all relate to copy-deterrent printed matter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5957861 [Patent Document 2] Japanese Patent Application Publication No. 6-262893 [Patent Document 3] Japanese Patent Application Publication No. 6-199085 [Patent Document 4] Japanese Utility Model Application Publication No. 6-71156 Summary of the Invention [Problem to be solved by the invention]

[0005] Thus, research and development into copy-prevention printed matter continues day and night, but at the same time, copy technology is also advancing and diversifying. For this reason, even if it is possible to prevent copying using a specific copy machine, it may not be possible to prevent copying using a different type of copy machine.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a copy prevention printout capable of preventing copying by various copy machines. [Means for solving the problem]

[0007] That is, the invention described in claim 1 is a printed matter in which a latent image and its background are printed and formed by tweezing, and the latent image becomes visible when the latent image is copied. The latent image is composed of a number of lines, The lines that make up this latent image are made up of minute dots, and the density is higher in the center area of ​​the line and lower as it approaches the periphery of the line, making this a copy-deterrent print.

[0008] Next, the invention described in claim 2 is the copy prevention printed matter described in claim 1, characterized in that the diameter of the dots is constant and the density is expressed by the area occupied by these dots.

[0009] Next, the invention described in claim 3 is such that the area occupied by the dots in the central region is Located on either side of the central area 3. The copy deterrent printed matter according to claim 2, characterized in that the area occupied by the dots in the peripheral region is at least 5% larger.

[0010] Next, the invention described in claim 4 is the copy deterrent printed matter described in any one of claims 1 to 3, characterized in that the diameter of the minute dots is 0.05 mm or less.

[0011] Next, the invention described in claim 5 is a copy-deterrent printed matter described in any of claims 1 to 4, characterized in that the background is composed of a large number of lines, and the lines that make up this background are lines with no change in density.

[0012] Next, the invention described in claim 6 is the copy deterrent printed matter described in claim 5, characterized in that the width of the lines constituting the latent image is 2 to 10 times that of the lines constituting the background.

[0013] Next, the invention described in claim 7 is a method for making a background image by using the lines pitch 7. The copy prevention print according to claim 5 or 6, characterized in that the thickness is 0.25 to 1.00 mm.

[0014] Next, the method according to claim 8 The invention is in the central area The dots occupy 12 to 20% of the surface area. In the peripheral areas The dots occupy 1 to 10% of the surface area. Claim 3 This is a copy-deterrent printed material.

[0015] Next, the invention described in claim 9 is a copy deterrent printed matter described in any of claims 5 to 8, characterized in that the line constituting the background and the line constituting the latent image are continuous to form a single line. Effect of the Invention

[0016] The copy-deterrent printed matter of the present invention is constructed by arranging minute dots, and is constructed so that the density is high in the central region of the line and decreases as it approaches the periphery of the line. As mentioned above, there are various copy machines, but in all copy machines, there is an area between the high-density central region and the low-density peripheral region that cannot be copied, and copying is not possible in the area closer to the periphery than this area. Therefore, when this copy-deterrent printed matter is copied, the density of the latent image decreases. On the other hand, the background is copied without decreasing in density, so the contrast between the copied latent image and the background is high, and the latent image can be easily recognized. And, for this reason, it is possible to strongly deter counterfeiting by copying. [Brief description of the drawings]

[0017] [Figure 1] 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 copying. [Diagram 2] FIG. 2 is an illustration of a latent image and background according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, specific examples of the present disclosure will be described with reference to the accompanying drawings. Fig. 1(a) is an explanatory diagram of a copy prevention print according to a specific example of the present invention.

[0019] As can be seen from FIG. 1(a), this copy deterrent print 100 is formed by printing a latent image 10 and a background 20. In this example, the latent image 10 is the character "copy." The latent image 10 and the background 20 are arranged with tweezers pressed together, with no gap between them. The density of the latent image 10 and the density of the background 20 are configured to be approximately equal. Since the latent image 10 and the background 20 have approximately the same density and are arranged with no gap between them, that is, with tweezers pressed together, it is difficult to distinguish between the two and recognize the latent image 10 by observing with the naked eye.

[0020] The latent image 10 is composed of a large number of lines arranged with blank spaces between the lines that are not printed. The background 20 is also composed of a large number of lines arranged with blank spaces between the lines that are not printed. In this way, both the latent image 10 and the background 20 are composed of a large number of lines arranged with blank spaces between them, but the lines that make up the latent image 10 and the lines that make up the background are of different types of lines, and by copying, the lines that make up the background are reproduced as they are, but the lines that make up the latent image change. Figure 1(b) shows the copy obtained by copying, and as shown here, the density of the latent image 10 has decreased, and a clear contrast appears between the latent image 10 and the background 20.

[0021] As shown in Figure 2, the lines 11 that make up the latent image 10 are made up of minute dots of the same diameter arranged randomly, and the density is expressed by the area occupied by these dots. This method of expressing density is called the FM (Frequency Modulation) screen method in the printing industry, and is a well-known method of expressing density.

[0022] The lines 11 constituting the latent image 10 are configured so that the area occupied by the dots is high in the central region of the lines 11 and decreases as it approaches the periphery of the lines. Therefore, the density is also high in the central region and decreases as it approaches the periphery of the lines. Since the lines 11 constituting the latent image 10 are thus configured with both high and low density regions, the density of the latent image 10 is configured to be approximately equal to the density of the background 20, making it difficult to recognize the latent image 10 by naked eye observation. On the other hand, the area occupied by the dots (i.e., density) is configured so that it is high in the central region and decreases as it approaches the periphery, and no matter which copy machine is used, there is an area between the central region and the periphery that cannot be copied, making it possible to visualize the latent image 10 by copying and deterring counterfeiting.

[0023] In this example, the central region 11 1 This central area 11 1 Located on both sides of the periphery area 11 2 The central region 11 thus constitutes the line 11 that constitutes the latent image 10. 1 This central area 11 1 Located on both sides of the periphery area 11 2 In the case where the peripheral region 11 is configured with 2 The area occupied by the dots in the central region 11 is set to 1 to 10% (preferably 3 to 6%). 1 It is desirable that the area occupied by the dots in the peripheral region 11 is 12 to 20% (preferably 12 to 16%). 2 If the area occupied by the dots in the peripheral region 11 is larger than this range, the density of the dots will increase overall, making the dots less likely to disappear. 2 If the area occupied by the dots in the central region 11 is smaller than this range, the density of the dots will be low overall if the line width b0 described below is narrow. 1 If the area occupied by the dots in the central region 11 is larger than this range, the density of the dots will increase overall, making it difficult for the dots to disappear. 1 If the area of ​​the dots in is smaller than this range, the density will be too low and the balance with the line 21 will be lost.

[0024] In addition, these central regions 11 1 and peripheral areas 11 2 It is also possible to arrange an intermediate region between the central region 11 and the 1 and peripheral areas 11 2 When an intermediate region is disposed between the central region 11 and the intermediate region 12, the area occupied by the dots in the intermediate region is 1 The area occupied by the dots and the surrounding area 11 2 Of course, the density is highest in the central region, next highest in the intermediate region, and 11% higher in the peripheral region. 2 The intermediate region may be provided in a plurality of places.

[0025] If the diameter of the dots constituting the lines constituting this latent image 10 is too large, they may be reproduced as is by copying. Also, if the diameter is too small, it becomes difficult to produce sufficient density. To avoid this, it is desirable to use dots with a diameter of 0.005 to 0.1 mm, preferably 0.05 mm or less. In a 150 line / inch screen, the diameter of the dots is 0.032 to 0.042 mm. In a 211 line / inch screen, the diameter of the dots is 0.02 to 0.03 mm. In this way, by making a plate using a 150 line / inch screen or a 211 line / inch screen, it is possible to print the lines 11 constituting the latent image 10. The dots may be round, elliptical, polygonal, or the like. In this case, the maximum diameter is used as the diameter of the dots.

[0026] By the way, in this way, the central area 11 1 and peripheral areas 11 2 Unlike the lines 11, which have different densities, the lines 21 that make up the background are printed with a uniform density, with no density variation. Therefore, they can be reproduced without losing density when copied.

[0027] As described above, both the latent image 10 and the background 20 are composed of a large number of lines (the lines 11 constituting the latent image 10 and the lines 21 constituting the background 20), but in order to make it difficult to recognize the latent image 10 by naked eye observation, it is desirable that the lines 11 constituting the latent image 10 and the lines 21 constituting the background 20 are continuous to form a single line. In other words, a single line is a line 21 with no density change in the background 20, and when this line is extended into the latent image 10, it becomes a line 11 composed of dots. In this example, both the lines 11 constituting the latent image 10 and the lines 21 constituting the background 20 are straight lines, but this is not limited to this and they may be curved lines.

[0028] In this way, the lines 11 constituting the latent image 10 and the lines 21 constituting the background 20 are continuous to form a single line, so the pitch a formed by the lines 21 constituting the background 20 and the blank spaces 22 between them is equal to the pitch formed by the lines 11 constituting the latent image 10 and the blank spaces 22 between them. This pitch a is preferably 0.25 to 1 mm. If the pitch a is larger than this range, the spacing between the lines will be wider, making it difficult to form characters (they will not become characters). If the pitch a is smaller than this range, the spacing between the lines will be narrower, increasing the possibility that the lines will be blurred when copied.

[0029] Incidentally, in order to make the density of the latent image 10 and the density of the background 20 approximately equal to make it difficult to recognize the latent image 10, it is desirable to set the width b0 of the line 11 constituting the latent image 10 to 2 to 10 times the width c of the line 21 constituting the background 20. 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 is likely to remain after copying, but the density of the dots must also be increased according to their thickness, so the dots are difficult to erase. If the line width c is smaller than this range, they will disappear after copying. Also, 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 blank areas between the dots will become narrower and will be difficult to erase. If the line width b0 is smaller than this range, the dots will not be blurred sufficiently, so they will be difficult to erase.

[0030] In addition, in order to make it difficult to recognize the latent image 10 and to make the latent image 10 visible when copied, the central region 11 1 It is desirable to set the width b1 of the blank space between the lines 11 constituting the latent image 10 to 0.0025 to 0.5 mm (preferably 0.01 to 0.1 mm), and the width b3 of the blank space between the lines 11 constituting the latent image 10 to 0.0125 to 0.6 mm. If the line width b1 is larger than this range, the density of the dots increases overall, making the dots less likely to disappear. If the line width b1 is smaller than this range, the density difference with the line 21 will be visible before copying, increasing the possibility that the latent image will be visible. If the blank space width b3 is larger than this range, the width b0 will be too large, and if it is smaller than this range, the width b0 will be too small. EXAMPLES

[0031] As the copy-deterrent printed matter 100, printed matter with the design of Fig. 1 was created under 30 types of conditions (Example 1 to Example 30) as shown in Table 1. The diameter of the dots constituting the lines 11 constituting the latent image 10 was set to 0.032 to 0.042 mm.

[0032] The obtained copy-inhibiting printed matter 100 of Examples 1 to 30 was evaluated for the visibility of the latent image before copying and the visibility of the latent image after copying. Five copy machines were used: Canon C5255R, RICOH MPC6502, Kyocera 3050ci, SHARP MX3610DS, and FUJI XEROX multi-copy machine. The copy conditions were color copy (normal mode, photo mode, map mode). The visibility after copying was visually evaluated for each example on a total of 15 sheets copied using the above-mentioned five copy machines and three modes. The evaluation of the visibility of the latent image before copying and the evaluation of the visibility of the latent image after copying (a comprehensive evaluation of the 15 copies of each example) are shown in Table 1.

[0033] [Table 1]

[0034] In all the examples, the latent image was invisible before copying, and was visible after copying. Among them, Examples 1 to 14 had a good balance between the concealment of the latent image before copying and the visibility of the latent image after copying, and Examples 4 and 7 were particularly excellent.

[0035] The present invention has been described above on the assumption that the background is plain, but it goes without saying that the background may be colored. In this case, when copying is made, a portion of the latent image 10 is not copied, and the density of the latent image is reduced, so that the latent image 10 appears to be a different color from the background 20. This makes it possible to discourage copying.

[0036] Also, a fine pattern or the like may be printed as the background. In this case, the latent image 10 will look different from the background 20 when copied. For this reason, copying can be strongly discouraged, just as in the case where the background is plain or colored. [Explanation of symbols]

[0037] 100: Copy control printouts 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: The pitch of the lines that make up the background b0: Width of the lines that make up the latent image 10 b1: Width of the central area b3: Width of the blank area c: The width of the lines that make up the background

Claims

1. A copy-deterrent printed matter is a printed matter in which a latent image and its background are printed by tweezing, and the latent image becomes visible when the printed matter is copied. The latent image is composed of a number of lines, The lines that make up this latent image are made up of minute dots, with the density being higher in the central area of ​​the line and lowering as one approaches the periphery of the line.

2. 2. The copy prevention print according to claim 1, wherein the diameter of the dots is constant, and the density is expressed by the area occupied by the dots.

3. 3. The copy prevention print according to claim 2, wherein the area occupied by the dots in the central region is at least 5% larger than the area occupied by the dots in the peripheral regions located on both sides of the central region.

4. 4. The copy prevention print according to claim 1, wherein the diameter of the minute dots is 0.05 mm or less.

5. 5. The copy prevention print according to claim 1, wherein the background is composed of a large number of lines, and the lines constituting the background are lines with no density change.

6. 6. The copy-deterrent printed matter according to claim 5, wherein the width of said lines constituting the latent image is 2 to 10 times that of said lines constituting the background.

7. 7. The copy prevention print according to claim 5, wherein the pitch of the lines constituting the background is 0.25 to 1.00 mm.

8. A copy deterrent printed matter as described in claim 3, characterized in that the area occupied by dots in the central region is 12 to 20%, and the area occupied by dots in the peripheral region is 1 to 10%.

9. 9. The copy deterrent printed matter according to claim 5, wherein the line constituting the background and the line constituting the latent image are continuous to form a single line.

Images