JP6936473B2 - Anti-counterfeit printed matter - Google Patents

Description

The present invention relates to anti-counterfeit printed matter used for securities, certificates and the like.

As a printed matter used for securities, certificates, etc., an anti-counterfeit printed matter in which a latent image reproduced by a copying machine and a background formed around the latent image are printed is known. For example, in Patent Document 1, the background is composed of many lines printed in parallel at a predetermined pitch, and the latent image has two straight lines arranged in parallel with a line width of 1/2 of the many lines. It is composed of many lines. In such a configuration, the latent image is hidden in the background and difficult to see, and when the latent image is copied by a copier, the latent image is copied and reproduced. Therefore, the authenticity can be easily determined and forgery can be performed. Can be prevented.

Japanese Unexamined Patent Publication No. 2004-25464

In the conventional configuration of Patent Document 1 described above, two straight lines are arranged in a latent image with respect to one straight line constituting the background universal line. Therefore, when the line is copied by a copying machine, the latent image is formed. The image can be reproduced relatively clearly. Further, since the line width of the latent image is set to 1/2 of the line width of the background, the density of the background (the ratio of the straight line portion in the area where the 10,000 lines are drawn) and the density of the latent image are substantially the same. There is also a camouflage effect that makes it difficult to see the latent image in the original. However, in a latent image, the number of straight lines is twice that of the background, and the number of lines differs greatly between the latent image and the background. Therefore, if the original is familiar, the latent image can be visually recognized. There was a limit to the camouflage effect of the latent image due to the background. In particular, in this conventional configuration, since the density of all lines is in the range of 20% to 35%, the background and the latent image are relatively clearly expressed on the paper, and if you get used to it as described above, It is easy to distinguish between the background and the latent image. This point also contributed to the limitation of the camouflage effect. Further, since the density of the background and the latent image is relatively high (in the range of 20% to 35%), the contrast between the copied background and the latent image is different when copied by a copying machine. Since both of these are clearly reproduced, the copied latent image is inconspicuous with respect to the background, and the effect of clearly expressing the copied latent image with respect to the background is also limited.

An object of the present invention is to propose an anti-counterfeit printed matter which can improve the camouflage effect that makes it difficult to visually recognize a latent image and can reproduce the latent image more clearly when copied.

The present invention is an anti-counterfeiting structure in which a double wire composed of two parallel wires at a predetermined pitch is arranged in parallel at a pitch wider than the pitch between the double wires. The anti-counterfeit image includes an image, and in the anti-counterfeit image, the background portion in which each line constituting the double line of the many lines has substantially the same line width and the density is 15% or less and the double line of the many lines are Anti-counterfeiting characterized by being composed of two lines having different line widths from each other and having a latent image portion having a density difference from the background portion in the range of -5% to + 5%. It is a printed matter.

In such a configuration, the background portion and the latent image portion of the anti-counterfeit image are composed of double lines, and the density of the background portion (the ratio of the lines in the background region) is set to 15% or less. Moreover, since the density of the latent image portion (the ratio of the line in the area of the latent image portion) is set to within ± 5% of the density of the background portion, the background portion and the latent image portion appear faint and can be seen as a whole. It is difficult to distinguish between the two because the difference in density between the two is extremely small, and it is difficult to see the latent image portion. In particular, since both the background portion and the latent image portion have a low density and are composed of double lines, the line width of the lines constituting the double lines is narrow, and the camouflage effect that makes the latent image portion difficult to see. Is dramatically improved. Further, since the entire background portion has a uniform density of 15% or less, when the background portion is uniformly copied by a general copying machine, the background portion is difficult to be detected by scanning of the copying machine, and the copied copy has a uniform density of 15% or less. The background portion is difficult to copy. On the other hand, although the density difference between the latent image portion and the background portion is extremely small, the double lines are composed of two lines having different line widths, so that the latent image portion is copied by the copying machine. In addition, one line having a large line width is easily detected by scanning with the copying machine, and it is difficult to copy the detected one line and the other line in the copy. Therefore, in the copy copied by the copying machine, one line of the double lines constituting the latent image portion is copied more clearly than the other line and the background portion, and the latent image is formed by the one line. The part is reproduced. Therefore, the copied latent image portion is conspicuously easy to see. Therefore, according to the configuration of the present invention, since it is difficult to visually recognize the latent image portion, the effect of camouflaging is extremely high, the effect of concealing the existence of the latent image portion is excellent, and the latent image is copied by a copying machine. Since the part is clearly copied and it can be easily determined that it is a copy, the effect of preventing forgery by copying is improved.

Further, in the configuration of the present invention, the background portion and the latent image portion are composed of double lines, and the structure is complicated as compared with a general universal line in which straight lines are arranged in parallel at predetermined intervals. Therefore, it is difficult to accurately analyze these structures to produce forgery, and the effect of preventing forgery is high. Therefore, the anti-counterfeiting effect can be greatly improved in addition to the above-mentioned effect of preventing counterfeiting by copying.

In this configuration, the latent image portion is preferably configured so that the density difference from the background portion is within the range of −3.5% to + 3.5%. With this configuration, the latent image portion becomes more difficult to distinguish from the background portion, so that the camouflage effect of the latent image portion can be further improved. Further, the density of the background portion is preferably in the range of 7% to 13%. Here, when the density is set to 13% or less, the background portion becomes more difficult to copy when copied, and the copied latent image portion can be reproduced more conspicuously. Further, if the concentration is lower than 7%, the density becomes too light, and the camouflage effect of the latent image portion may be reduced, or the reproducibility of the latent image portion may be reduced when the image is copied.

In the anti-counterfeit printed matter of the present invention described above, in the anti-counterfeit image, the pitch between adjacent double lines is 1.1 times as large as the pitch between the lines constituting the double lines. A configuration in the range of 1.5 times is proposed.

With this configuration, the pitch between adjacent double lines (referred to as the pitch between adjacent lines) is 1.1 to 1.5 times the pitch between lines, so that the background and latent image are doubled. The camouflage effect of the present invention described above by lines and the effect of being able to clearly copy the latent image portion can be exhibited more stably. This is because each line of the double line can be expressed independently by setting the relative relationship between the adjacent pitch and the line pitch within the above range. Therefore, for example, two adjacent lines are not mistaken for one line, and the background portion and the latent image portion having a low density can be expressed substantially uniformly.

Here, if the pitch between adjacent lines is closer to 1 times than 1.1 times the pitch between lines, it becomes close to a general universal line in which straight lines are arranged at regular intervals, so that the effect as the above-mentioned double line is obtained. Reduce. Further, if it is made smaller than 1 times, adjacent lines will be too close to each other, and the two lines will be easily seen as one line, so that the above-mentioned effect may not be sufficiently exhibited. On the other hand, if it is made larger than 1.5 times, the pitch between adjacent lines becomes relatively wider than the pitch between lines, each double line is emphasized, and the camouflage effect described above may be reduced.

In the anti-counterfeit printed matter of the present invention described above, one of the double lines of the latent image portion is a continuous line equal to or thicker than the line width of the double line of the background portion. A configuration is proposed in which the other line is a continuous line or a broken line with a line width narrower than that of the one line. Here, the broken line also includes a dotted line.

In such a configuration, when copying is performed by a copying machine, scanning by the copying machine emphasizes one line having a wide line width with respect to the other line having a narrow line width. The line is clearly detected. Therefore, one line having a large line width is relatively clearly copied, and the latent image portion can be reproduced by the copied line. As a result, in the copy copied by the copier, the copied latent image portion can be clearly seen, so that the original can be more easily and surely distinguished from the original in which the latent image portion is concealed.

In the anti-counterfeit printed matter of the present invention described above, one of the double lines of the latent image portion is a broken line thicker than the line width of the double line of the background portion, and the other line is the one. A configuration is proposed in which a continuous line has a line width narrower than that of. Here, the broken line also includes a dotted line.

In such a configuration, when copying is performed by a copying machine, scanning by the copying machine emphasizes one line having a wide line width with respect to the other line having a narrow line width. The line is clearly detected. Therefore, one line having a large line width is relatively clearly copied, and the latent image portion can be reproduced by the copied line. This makes it easier and more reliable to distinguish between the copy and the original. Further, since one of the lines is a broken line with a thick line width, an increase in the density of the latent image portion can be suppressed as much as possible, and the camouflage effect of the background portion can be sufficiently maintained. Therefore, according to this configuration, the effect of camouflaging the latent image portion and the effect of distinguishing the above-mentioned copy can be more stably exhibited.

In the anti-counterfeit printed matter of the present invention described above, it is proposed that the double line of the latent image portion has a line width narrower than the double line of the background portion of the other line, which is thinner than one line. ..

According to such a configuration, the density of the latent image portion can be made as close as possible to the density of the background portion, so that the camouflage effect of the latent image portion by the background portion can be improved. Further, when copying with a copying machine, it is possible to more easily detect one line having a thick line width, so that the latent image portion can be easily reproduced and the copy can be more easily distinguished.

As described above, the anti-counterfeit printed matter of the present invention includes a background portion composed of double lines having the same line width and a latent image portion composed of double lines having different line widths, and the density of the background portion is 15%. Since the density of the latent image portion is as follows and the density of the latent image portion is within ± 5% of the density of the background portion, the effect of camouflaging the latent image portion is high, and the image is copied when it is copied by a copying machine. The latent image can be seen relatively clearly. Therefore, according to the configuration of the present invention, the effect of concealing the latent image portion by the original is high, and the copy and the original can be relatively easily distinguished, and the effect of preventing forgery is high.

It is explanatory drawing which enlarges and shows the anti-counterfeit image 2A of the anti-counterfeit printed matter 1 which concerns on Example 1. FIG. It is explanatory drawing which shows a part of the anti-counterfeit image 2A further enlarged. It is explanatory drawing which shows the copy image 102A which copied the anti-counterfeit image 2A. It is explanatory drawing which enlarges and shows a part of the anti-counterfeit image 2B of Example 2. FIG. It is explanatory drawing which shows the copy image 102B which copied the anti-counterfeit image 2B. It is explanatory drawing which enlarges and shows the anti-counterfeit image 2C of Example 3. FIG. It is explanatory drawing which shows a part of the anti-counterfeit image 2C further enlarged. It is explanatory drawing which shows the copy image 102C which copied the anti-counterfeit image 2C. It is explanatory drawing which enlarges and shows a part of the anti-counterfeit image 2D of Example 4. FIG. It is explanatory drawing which shows the copy image 102D which copied the anti-counterfeit image 2D. It is explanatory drawing which enlarges and shows the anti-counterfeit image 2E of Example 5. It is explanatory drawing which shows a part of the anti-counterfeit image 2E further enlarged. It is explanatory drawing which shows the copy image 102E which copied the anti-counterfeit image 2E. It is a chart which shows the evaluation result of Examples 1-5 and Comparative Examples 1-4.

Embodiments of the present invention will be described with reference to Examples 1-5 below.

FIG. 1 shows an anti-counterfeit image 2A printed on the paper surface of the anti-counterfeit printed matter 1 of Example 1. The anti-counterfeit printed matter 1 is used, for example, for securities, certificates, and the like. As shown in FIGS. 1 and 2, the anti-counterfeit image 2A is composed of many lines 21 in which a plurality of double lines 22 and 26 are arranged in parallel, and starts from two continuous lines 23 and 23 having the same line width. It is composed of a background portion 11 in which a plurality of double lines 22 are arranged in parallel, and a latent image portion 12 in which a plurality of double lines 25 composed of two continuous lines 26a and 26b having different line widths are arranged in parallel. .. Here, the latent image portion 12 is an image of "double" characters (see FIG. 3), and the background portion 11 is provided around the latent image portion 12.

As shown in FIG. 2, the background portion 11 is formed by arranging the above-mentioned double lines 22 at a predetermined pitch, and the double lines 22 are formed from two substantially parallel continuous lines 23 and 23. Become. Then, the pitch P1 between the adjacent double lines 22 (hereinafter, the pitch between the adjacent lines) is from the pitch (hereinafter, the pitch between the lines) P2 between the two continuous lines 23, 23 constituting the double line 22. Is also set to be wide. Here, in the present embodiment, the adjacent pitch P1 is the adjacent double lines 22 and 22, and indicates the distance (interval) between the center of each line width of the adjacent continuous lines 23 and 23. That is, among the two continuous lines 23 and 23 that form one of the adjacent double lines 22, the center of the line width of the continuous line 23 that is close to the other double line 22 and the two lines that make up the other. The distance between the continuous lines 23 and 23 and the center of the line width of the continuous line 23 adjacent to one of the double lines 22 is shown. Further, the line-to-line pitch P2 indicates the distance between the center of the line width of one continuous line 23 and the center of the line width of the other continuous line 23 of the two continuous lines 23, 23 constituting the double line 22. ..

The latent image portion 12 is composed of a double line 25 continuous with the double line 22 of the background portion 11, and the pitch P1 between adjacent lines and the pitch P2 between the lines thereof are substantially equal to the background portion 11. The double line 25 of the latent image unit 12 is composed of two continuous lines 26a and 26b having different line widths, and each of the continuous lines 26a and 26b is two continuous lines constituting the background portion 11. The lines 23 and 23 are provided in a straight line and substantially parallel to each other. Further, in each of the double lines 25 of the latent image portion 12, one of the two continuous lines 26a and 26b constituting the double line 25 is the continuous line 26a of the background portion 11. The line width is thicker than that of the continuous line 23, and the other continuous line 26b is narrower than the line width of the continuous line 23.

As a specific example of such a background portion 11, the line widths of the continuous lines 23 and 23 of the double line 22 are about 32 μm, the adjacent pitch P1 is about 280 μm, and the line pitch P2 is about 220 μm, and the number of lines per inch. Is 100 lines. In this case, the background portion 11 has a density (area ratio occupied by the double line 22) of about 12.5%, and the adjacent pitch P1 is about 1.3 times the line pitch P2. On the other hand, as a specific example of the latent image portion 12, the line width of one continuous line 26a of the double line 25 is about 53 μm, and the line width of the other continuous line 26b is about 21 μm. The adjacent pitch P1 and the line pitch P2 are substantially equal to the background portion 11 described above, and the number of lines is also equal to the background portion 11. In this case, the latent image portion 12 has a density of about 14.6%, and the density difference from the background portion 11 is about 2.1%.

In the anti-counterfeit printed matter 1 of the first embodiment, the background portion 11 and the latent image portion 12 of the anti-counterfeit image 2A have a low density, and the density difference between the background portion 11 and the latent image portion 12 is extremely large. Due to its small size, the anti-counterfeit image 2A is generally faint and difficult to see, and it is extremely difficult to distinguish the latent image portion 12 from the background portion 11 (see FIG. 1). Therefore, the effect of camouflaging the latent image portion 12 is high. Further, the background portion 11 and the latent image portion 12 are composed of the double lines 22 and 25 of the adjacent pitch P1 and the line pitch P2 described above, and the continuous lines constituting the double lines 22 and 25, respectively. 23 and 26 can be expressed independently one by one. Then, by setting the background portion 11 and the latent image portion 12 formed by the double lines 22 and 25 to the above-mentioned low densities, both the background portion 11 and the latent image portion 12 can be expressed substantially uniformly and lightly. That is, by forming the double lines 22 and 25, the background portion 11 and the latent image portion 12 that are substantially uniformly expressed at a low density can be formed, and the effect of camouflaging the latent image portion 12 can be greatly improved. ..

Further, when the anti-counterfeit printed matter 1 is copied by a general copying machine, the background portion 11 has a uniformly low density (about 12.5%), so that it is difficult to detect by scanning with the copying machine, and the whole is accurate. It is not copied to the image, and a part of it is not clearly copied. On the other hand, although the latent image portion 12 has a low density, each double line 25 is composed of a continuous line 26a having a thick line width and a continuous line 26b having a thin line width. Is easy to detect. Therefore, the thick continuous line 26a of the latent image portion 12 is relatively clearly copied, and the thin continuous line 26b is hardly copied. Therefore, in the copy of the anti-counterfeit printed matter 1, as shown in FIG. 3, the copy reproduced by the copy line 126 in which the thick continuous line 26a of the latent image portion 12 is copied to the portion where the anti-counterfeit image 2A is copied. A copy image 102A including the latent image unit 112 appears. Here, in the copy latent image unit 112, the "double" character image (latent image unit 12) is reproduced by the copy line 126. In this way, in the copy, the thick continuous line 26a of each double line 25 constituting the latent image portion 12 is copied, the copy line 126 appears relatively clearly, and the background portion 11 around the copy line 126 is as described above. Since the copy is only partially copied to the copy image 102A, which is a copy of the anti-counterfeit image 2A, the copy latent image portion 112 reproduced by the copy line 126 is conspicuously displayed. Therefore, when the anti-counterfeit printed matter 1 of the first embodiment is copied by a general copying machine, the copied thick continuous line 26a expresses the "double" characters so that they can be clearly seen. Will be done.

As described above, the anti-counterfeit printed matter 1 of the first embodiment has a high effect of camouflaging the latent image portion 12 of the anti-counterfeit image 2A by the background portion 11, and can conceal the existence of the latent image portion 12 (see FIG. 1). Then, when the copy is made by a copying machine, the latent image unit 112 clearly reproduces the latent image unit 12 in the copy (see FIG. 3), so that the original can be easily and clearly distinguished from the original. This makes it possible to prevent counterfeiting by the copying machine. Further, since the anti-counterfeit image 2A is composed of the double lines 22 and 25 of the adjacent pitch P1 and the line pitch P2 which are set relatively precisely, the anti-counterfeit image 2A has a relatively complicated structure. It is extremely difficult to analyze the structure and produce an accurate forgery, and it is highly effective in preventing forgery. Therefore, in addition to the anti-counterfeiting effect of copying, the anti-counterfeit printed matter 1 of the first embodiment has an extremely high effect of preventing counterfeiting by the anti-counterfeit image 2A. The camouflage effect and the anti-counterfeiting effect are due to the fact that the background portion 11 and the latent image portion 12 are each composed of double lines 22 and 25 as described above, so that the latent image portion 12 is clarified. The effect of copying to is due to the fact that the latent image portion 12 is composed of double lines 25 having different line widths from each other.

The anti-counterfeit printed matter 1 of Example 2 is provided with a latent image portion 32 in which double lines 35 composed of continuous lines 36a and 36b are arranged in parallel, as in Example 1 described above. The line widths of the lines 36a and 36b are different from those in the first embodiment. The anti-counterfeit image 2B of the second embodiment is composed of the latent image portion 32 and the background portion 11 described above, and is different from the first embodiment except that the line widths of the continuous lines 36a and 36b of the latent image portion 32 are different. It is the same, and the details of the same components are omitted as appropriate.

As shown in FIG. 4, in the latent image portion 32, one continuous line 36a constituting the double line 35 has substantially the same line width as the continuous line 23 forming the double line 22 of the background portion 11, and the other. The continuous line 36b of is narrower than the continuous line 23 of the background portion 11. In the double line 35 of the latent image portion 32, the two continuous lines 36a and 36b are arranged substantially in parallel, and the continuous lines 36a and 36b are the background portion 11 as in the above-described first embodiment. It is continuous with the continuous lines 23 and 23, respectively.

As a specific example, in the double line 35 of the latent image unit 32, the line width of one continuous line 36a is about 32 μm, and the line width of the other continuous line 36b is about 21 μm. The density of the latent image portion 32 is about 10.4%, and the difference from the density of the background portion 11 (about 12.5%) is about 2.1%. The line width of the other background portion 11, the adjacent pitch P1 and the line pitch P2, the density of the background portion 11, and the like are the same as those in the above-described first embodiment.

Even in the anti-counterfeit image 2B of the second embodiment, since the background portion 11 and the latent image portion 32 are each composed of the double lines 22 and 35, the latent portion 11 and the latent image portion 32 are formed of the double lines 22 and 35, respectively, as in the case of the above-described first embodiment. The effect of camouflaging the image unit 32 is high. Further, when copying with a general copying machine, in the latent image unit 32, since the double line 35 is composed of continuous lines 36a and 36b having different line widths, scanning by the copying machine can be performed. , The thicker continuous line 36a is easily detected. Therefore, similarly to the above-described first embodiment, when copied by a copying machine, one continuous line 36a constituting the double line 35 of the latent image unit 32 is relatively clearly copied, and the other continuous line 36b is copied. Is rarely copied. On the other hand, since the continuous line 23 of the background portion 11 has substantially the same line width as one continuous line 36a of the latent image portion 32, the background portion 11 is compared with the above-described first embodiment when copying by a copying machine. The continuous line 23 of the background portion 11 is also easily detected, and the continuous line 23 is relatively easily copied in the vicinity of the latent image portion 32. As shown in FIG. 5, such a copy includes a copy latent image unit 132 reproduced by a copy line 136 that is a copy of one continuous line 36a of the latent image unit 32, and a background around the copy latent image unit 132. A copy image 102B including a copy peripheral part 131 reproduced by a copy line 135 that is a copy of the continuous line 23 of the part 11 appears. Then, in the copied image 102B, since the other continuous line 36b of the latent image portion 32 is hardly copied as described above, the density of the duplicated latent image portion 132 is lower than that of the copy peripheral portion 131. Therefore, the copy latent image unit 132 is expressed as a blank character (“double” character image) in the copy peripheral portion 133, and is relatively clearly visible.

Further, the configuration of the second embodiment can also have the effect of preventing forgery as in the first embodiment described above. Therefore, the anti-counterfeit printed matter 1 of Example 2 has the same effect as that of Example 1 described above.

In the anti-counterfeit printed matter 1 of the third embodiment, as shown in FIG. 6, the anti-counterfeit image 2C includes a latent image portion 42 composed of a double line 45 composed of a continuous line 46 and a broken line 47. The latent image portion 42 is formed by arranging a plurality of the double wires 45 in parallel. And even in the third embodiment, the latent image portion 42 is an image of "double" characters as in the first embodiment described above. Since the configuration other than the latent image unit 42 is the same as that of the first embodiment described above, the details thereof will be omitted as appropriate.

As shown in FIG. 7, the double line 45 of the latent image portion 42 is a continuous line 46 having a line width substantially the same as the continuous line 23 of the double line 22 constituting the background portion 11, and a continuous line of the background portion 11. A broken line 47 having a line width wider than 23 is arranged substantially in parallel with an interline pitch P2. In the latent image portion 42, the adjacent pitch P1 and the interline pitch P2 of the double line 45 are substantially the same as the adjacent pitch P1 and the interline pitch P2 of the double line 22 of the background portion 11. The continuous line 46 and the broken line 47 of the double line 45 are continuous with the continuous lines 23 and 23 forming the double line 22 of the background portion 11, respectively.

As a specific example, the continuous line 46 of the double line 45 of the latent image portion 42 has a line width of about 32 μm, and the broken line 47 has a line width of about 85 μm, a length of each line segment of about 110 μm, and each line segment. The interval is about 110 μm. The line pitch P2 between the continuous line 46 and the broken line 47 of the double line 45 is the same as that of the first embodiment, and the adjacent pitch P1 between the adjacent double lines 45 is also the same as that of the first embodiment. .. The density of the latent image portion 42 is about 14.6%, and the difference from the density of the background portion 11 (about 12.5%) is about 2.1%.

Even in the anti-counterfeit image 2C of the third embodiment, the background portion 11 and the latent image portion 42 are each composed of the double lines 22 and 45 and have a low density, respectively, as in the above-described first embodiment. Therefore, the effect of camouflaging the latent image portion 42 is high (see FIG. 6). Here, the broken line 47 of the double line 45 constituting the latent image portion 42 is more than twice as wide as the continuous line 23 of the double line 22 of the background portion 11, but the density is low due to the broken line form. Since it can be suppressed, it is difficult to see and it is difficult to distinguish it from the background portion 11. Further, since the latent image portion 42 is composed of a double line 45 composed of a continuous line 46 having a different line width and a broken line 47, when the image is copied by a copying machine, the broken line 47 having a thick line width is scanned. Is easy to detect. Therefore, in the copy copied by the copier, as shown in FIG. 8, the copy image 102C provided with the copy latent image unit 142 reproduced by the copy line 147 on which the broken line 47 is copied appears. Here, in the copy latent image unit 142, the "double" character image (latent image unit 12) is reproduced by the copy line 147, and the background portion 11 is partially around the copy latent image unit 142. It is copied unclearly. Therefore, in the copied image 102C, the copied latent image portion 142 is conspicuously reproduced, so that the image of the "double" character is relatively clearly visible. Thus, the original and the copy can be easily and clearly distinguished, and forgery by the copying machine can be prevented as in Examples 1 and 2 described above.

Further, in the third embodiment, the double line 45 of the latent image portion 42 is composed of the continuous line 46 and the broken line 47, and the entire anti-counterfeit image 2C has a complicated and precise structure. It is more difficult to forge, and the effect of preventing forgery is extremely high. As described above, even in the configuration of the third embodiment, the same effects as those of the first embodiment described above can be obtained.

The anti-counterfeit printed matter 1 of the fourth embodiment is provided with a latent image portion 52 in which a double line 55 composed of a continuous line 56 and a broken line 57 is arranged in parallel, as in the case of the third embodiment described above. The line width of the line 56 and the line width of the broken line 57 are different from those in the third embodiment. The anti-counterfeit image 2D of the fourth embodiment is composed of the latent image portion 52 and the background portion 11 described above, and the above-described embodiment except that the continuous line 56 of the latent image portion 52 and the broken line 57 are different in line width. It is the same as 3, and the details thereof will be omitted as appropriate.

As shown in FIG. 9, the double line 55 of the latent image portion 52 includes a continuous line 56 having a narrower line width than the continuous line 23 constituting the double line 22 of the background portion 11 and the double line 56 of the background portion 11. A broken line 57 having a line width thicker than that of the continuous line 23 of the line 22 is arranged substantially in parallel with an interline pitch P2. The line width of the broken line 57 is wider than that of the broken line 47 of the third embodiment, and the line segment length and the interval are substantially the same. In the latent image unit 52, similarly to the above-described fourth embodiment, the adjacent pitch P1 and the inter-line pitch P2 of the double-dashed line 55 are the adjacent pitch P1 and the inter-line pitch of the double-dashed line 22 of the background portion 11. It is substantially the same as P2, and the continuous line 56 and the broken line 57 of the double line 55 are continuous with the continuous lines 23 and 23 forming the double line 22 of the background portion 11, respectively.

As a specific example, the continuous line 56 of the double line 55 of the latent image portion 52 has a line width of about 21 μm, and the broken line 57 has a line width of about 110 μm. The line segment length and interval of the broken line 57, the inter-line pitch P2, and the adjacent pitch P1 are the same as those in the third embodiment. The density of the latent image portion 52 is about 14.6%, and the difference from the density of the background portion 11 (about 12.5%) is about 2.1%.

In the anti-counterfeit image 2D of the fourth embodiment, similarly to the third embodiment described above, since the double line 55 of the latent image portion 52 is composed of the continuous line 56 and the broken line 57, the copying machine can be used. When the image is copied, the broken line 57 with a thick line width is easily detected. Therefore, as shown in FIG. 10, in the copy, the copy image 102D having the copy latent image unit 152 reproduced by the copy line 157 on which the broken line 57 is copied appears, and the copy latent image unit 152 is conspicuously reproduced. Therefore, the image of "double" characters is relatively clearly visible. In particular, in the fourth embodiment, since the difference in line width between the continuous line 56 and the broken line 57 constituting the double line 55 of the latent image portion 52 is larger than that in the third embodiment described above, copying is performed by the copying line 157. The latent image portion 152 is reproduced more clearly. Therefore, the original and the copy can be easily and clearly distinguished, and forgery by the copying machine can be prevented as in the above-described third embodiment.

Further, in the fourth embodiment, similarly to the third embodiment described above, since the background portion 11 and the latent image portion 52 are each composed of the double lines 22 and 55 and have a low density, the latent image portion 52 Is highly effective in camouflaging. Further, since the double line 55 of the latent image portion 52 is composed of the continuous line 56 and the broken line 57, it is more difficult to accurately forge the anti-counterfeit image 2D, and the effect of preventing forgery is extremely high. As described above, even in the configuration of the fourth embodiment, the same effects as those of the third embodiment described above can be obtained.

The anti-counterfeit printed matter 1 of Example 5 is provided with a latent image portion 62 in which a double line 65 composed of a continuous line 66 and a broken line 67 is arranged in parallel, as in the above-described Examples 3 and 4. , The line width of the continuous line 66 and the line width of the broken line 67 are different from those of Examples 3 and 4. As shown in FIG. 11, the anti-counterfeit image 2E of the fifth embodiment includes such a latent image portion 62 and the background portion 11 described above, and the line width between the continuous line 66 and the broken line 67 of the latent image portion 62 is It is the same as Examples 3 and 4 described above except that they are different, and the details thereof will be omitted as appropriate.

As shown in FIG. 12, the double line 65 of the latent image portion 62 is a continuous line 66 having a wider line width than the continuous line 23 constituting the double line 22 of the background portion 11 and the double line 66 of the background portion 11. The continuous line 23 of the line 22 and the broken line 67 having substantially the same line width are arranged substantially in parallel with the line pitch P2. The continuous line 66 has a line width thicker than the continuous lines 46 and 56 of Examples 3 and 4, and the broken line 67 has a line width narrower than the broken lines 47 and 57 of Examples 3 and 4. The minute length and interval are almost the same. In the latent image unit 62, similarly to the above-described Examples 3 and 4, the adjacent pitch P1 and the interline pitch P2 of the double line 65 are the adjacent pitch P1 and the line of the double line 22 of the background portion 11. It is substantially the same as the inter-pitch P2, and the continuous line 66 and the broken line 67 of the double line 65 are continuous with the continuous lines 23 and 23 forming the double line 22 of the background portion 11, respectively.

As a specific example, the continuous line 66 of the double line 65 of the latent image portion 62 has a line width of about 64 μm, and the broken line 67 has a line width of about 32 μm. The line segment length and interval of the broken line 67, the inter-line pitch P2, and the adjacent pitch P1 are the same as those in the third and fourth embodiments. The density of the latent image portion 62 is about 15.6%, and the difference from the density of the background portion 11 (about 12.5%) is about 3.1%.

In the anti-counterfeit image 2E of the fifth embodiment, since the double line 65 of the latent image portion 62 is composed of the continuous line 66 and the broken line 67, the line width is large when the image is copied by the copying machine. The continuous line 66 is easily detected. Therefore, in the copy, as shown in FIG. 13, a copy image 102E having a copy latent image unit 162 reproduced by the copy line 166 that is a copy of the continuous line 66 appears, and the copy latent image unit 162 is conspicuously reproduced. Therefore, the image of "double" characters is relatively clearly visible. Thus, the original and the copy can be easily and clearly distinguished, and forgery by the copying machine can be prevented as in the above-described Examples 3 and 4.

Further, Example 5 has a high effect of camouflaging the latent image portion 62, similarly to Examples 3 and 4 described above. Here, the density difference between the latent image portion 62 and the background portion 11 is within ± 5% (more specifically, within ± 3.5%), although it is slightly higher than that in Examples 3 and 4 described above. Therefore, the anti-counterfeit image 2E is faint and difficult to see as a whole, and the presence of the latent image portion 62 can be concealed by the background portion 11 (see FIG. 11). Furthermore, even in the fifth embodiment, the anti-counterfeit image 2E has a complicated and precise structure, so that the anti-counterfeiting effect is high. Therefore, even with the configuration of the fifth embodiment, the same effects as those of the above-mentioned examples 3 and 4 can be obtained.

Next, the results of comparing Examples 1 to 5 described above with Comparative Examples 1 to 5 below will be described. The detailed configuration of each Comparative Example 1 to 4 will be described below, and the evaluation results of the Comparative Examples 1 to 4 and the above-mentioned Examples 1 to 5 will be described.

(Comparative Example 1)
Comparative Example 1 is composed of a background portion composed of a plurality of continuous lines arranged in parallel at a predetermined pitch, and a latent image portion in which a plurality of continuous lines having a line width 1/2 of the continuous lines of the background portion are arranged in parallel. It is provided with an anti-counterfeit image (not shown), and is the same as the above-mentioned conventional configuration (configuration of Patent Document 1). In this anti-counterfeit image, as in the above-described embodiment, an image of "double" characters is formed by the latent image portion, and a background portion is provided around the latent image portion. The latent image portion of Comparative Example 1 is formed by arranging two continuous lines branched from each continuous line of the background portion in parallel. Therefore, the density of the latent image portion is substantially the same as that of the background portion. As a specific example of Comparative Example 1, the continuous line of the background portion has a line width of about 100 μm and a pitch of about 400 μm, and the density of the background portion is about 25%. The continuous line of the latent image portion has a line width of about 50 μm and a pitch of about 200 μm, and the density of the latent image portion is about 25%, which is substantially the same as that of the background portion.

(Comparative Example 2)
Similar to Comparative Example 1 described above, Comparative Example 2 is a latent image portion in which a background portion in which a plurality of continuous lines are arranged in parallel and a plurality of continuous lines having a line width of 1/2 of the continuous lines in the background portion are arranged in parallel. Therefore, the anti-counterfeit image is constructed. In Comparative Example 2, the line width and pitch of each continuous line are changed so that the density of the background portion and the latent image portion is lower than that of Comparative Example 1. As a specific example, the continuous line of the background portion has a line width of about 50 μm and a pitch of about 380 μm, and the density of the background portion is about 13%. The continuous line of the latent image portion has a line width of about 25 μm and a pitch of about 190 μm, and the density of the latent image portion is about 13%, which is substantially the same as that of the background portion.

(Comparative Example 3)
Comparative Example 3 is an anti-counterfeit image composed of a background portion composed of a plurality of continuous lines arranged in parallel at a predetermined pitch and a latent image portion composed of a plurality of broken lines continuous with the continuous lines of the background portion. Each continuous line of the background portion and each continuous line of the latent image portion are arranged in a straight line. Then, in this anti-counterfeit image, an image of "double" characters is formed by the latent image portion, and a background portion is provided around the latent image portion, as in the above-described embodiment. As a specific example, the continuous line of the background portion has a line width of about 100 μm and a pitch of about 400 μm, and the density of the background portion is about 25%. Further, the broken line of the latent image portion has a line width of about 200 μm, and the line segment length and the interval of the broken line are set so that the density of the latent image portion is substantially equal to the density of the background portion.

(Comparative Example 4)
Comparative Example 4 is an anti-counterfeit image composed of a background portion of the double line and a latent image portion of the double line, similar to the first embodiment described above, and the line widths of the background portion and the latent image portion are changed. And the pitch is changed. As a specific example, the two continuous lines constituting the double line of the background portion each have a line width of about 90 μm, an adjacent pitch of about 400 μm, and a line-to-line pitch of about 300 μm. Further, the continuous line forming the double line of the latent image portion has a line width of about 110 μm on one side and a line width of about 90 μm on the other side. The pitch between the adjacent images and the pitch between the lines of the latent image portion are substantially the same as those of the background portion. The density of such a background portion is about 25%, and the density of the latent image portion is about 28%.

FIG. 14 shows an evaluation result comparing these Comparative Examples 1 to 4 with the above-mentioned Examples 1 to 5. Here, the evaluation items are two items, "invisibility of the original" and "visibility of the copy". "Invisibility of the original" is determined by looking at the originals (anti-counterfeit printed matter) of specific examples of Examples 1 to 5 and Comparative Examples 1 to 4, and whether or not the latent image portion is difficult to see in each anti-counterfeit image. Is evaluated. In the evaluation of this item, when it is difficult to see the latent image portion, the evaluation is "○", indicating that the latent image portion has high camouflage property. On the other hand, in the "visibility of the copy", the originals (anti-counterfeit printed matter) of the specific examples of Examples 1 to 5 and Comparative Examples 1 to 4 are copied by a general copying machine, and each copy is viewed. This is an evaluation of whether or not the copied latent image portion (image of "double" characters) is easy to see. In the evaluation of this item, when the copy latent image portion is easy to see, the evaluation is "○", which indicates that the effect of easily distinguishing the copy and the original is high.

As shown in the evaluation results, Examples 1 to 5 were evaluated as "○" in both "invisibility of the original" and "visibility of the copy". That is, in each of the originals (anti-counterfeit printed matter 1) of Examples 1 to 5, as described above, when the anti-counterfeit images 2A to 2E are viewed, they are generally faint and difficult to see, and the latent image portions 12, 32. , 42, 52, 62 and the background portion 11 are difficult to distinguish, so that the camouflage effect of these latent image portions 12, 32, 42, 52, 62 is high. This is because the background portion 11 and each latent image portion 12, 32, 42, 52, 62 are each composed of double lines, each has a low density, and the density difference is extremely small. NS. Therefore, in Examples 1 to 5, the existence of each latent image portion 12, 32, 42, 52, 62 can be concealed, and the effect of preventing forgery is high.
On the other hand, in the copy of each of the originals of Examples 1 to 5, as described above, the respective copy latent image portions 112, 132, 142, 152, 162 are reproduced relatively clearly. This is due to the low density of the background portion 11 and the relatively clear copying of one of the two lines constituting each latent image portion 12, 32, 42, 52, 62. Therefore, in the copy obtained by copying Examples 1 to 5 with a copying machine, each copy latent image portion 112, 132, 142, 152, 162 can be easily and clearly visually recognized, so that it can be easily distinguished from the original. can. Therefore, in Examples 1 to 5, the effect of preventing forgery by the copying machine is high.

Further, the evaluation results of Comparative Example 1 were "x" evaluation for "invisibility of the original" and "Δ" evaluation for "visibility of the copy". Here, in Comparative Example 1, the line width of the 10,000 lines constituting the background portion is thicker and the density is significantly higher than in Examples 1 to 5, and the density of the latent image portion is also high. Therefore, in addition to being able to relatively easily know the existence of the anti-counterfeit image in the original, the number of lines of the latent image portion is twice that of the background portion, so that the latent image portion can be visually recognized when familiar. Thus, the "invisibility of the original" in Comparative Example 1 is an "x" evaluation.
On the other hand, in the copy obtained by copying Comparative Example 1, since the number of lines of the background portion and the latent image portion of Comparative Example 1 are different, the background portion is more easily copied than the latent image portion, and both of them. Makes a difference in the reproducibility of. However, in Comparative Example 1, since the density of the background portion and the latent image portion is high, both are relatively clearly copied, and compared with the above-mentioned Examples 1 to 5, both are copied in the copy of Comparative Example 1. It's hard to tell, but once you get used to it, you can see the image of "double" characters. Therefore, the "visibility of the copy" in Comparative Example 1 is an "Δ" evaluation.

Further, the evaluation results of Comparative Example 2 were "Δ" evaluation for "invisibility of the original" and "x" evaluation for "visibility of the copy". Here, in Comparative Example 2, since the densities of the background portion and the latent image portion are as low as in Example 1, it is difficult to see the background portion and the latent image portion as compared with Comparative Example 1 described above. However, since the line width of the background portion is thicker than that of the first embodiment, it is possible to see the background portion when familiar with it, and the latent image portion can be known accordingly. Therefore, the "invisibility of the original" in Comparative Example 2 is a "Δ" evaluation.
On the other hand, in Comparative Example 2, since the density of the background portion and the latent image portion is low, it is difficult to copy both of them. Further, since the continuous lines constituting the latent image portion have the same line width, it is difficult to copy the latent image portion as a whole. Since the line width of the background portion is twice that of the latent image portion, the background portion is easier to copy than the latent image portion, but both of them are unclear in the copy. Because it is easy, it is difficult to visually recognize the image of "double" characters. Therefore, the "visibility of the copy" in Comparative Example 2 is a "Δ" evaluation.

Further, the evaluation results of Comparative Example 3 were "x" evaluation for "invisibility of the original" and "Δ" evaluation for "visibility of the copy". Here, in Comparative Example 3, since the line widths of the continuous line of the background portion and the broken line of the latent image portion are thick and the density of the background portion and the latent image portion is high, it becomes familiar with the continuous line. The broken line can be distinguished relatively easily, and the latent image portion can be easily visually recognized. Thus, the "invisibility of the original" in Comparative Example 3 is an "x" evaluation.
On the other hand, in Comparative Example 3, the background portion is a continuous line, the latent image portion is a broken line, and the density of both is high. Therefore, in this copy, both the background portion and the latent image portion are clearly defined. Since they are copied and the difference between the two is small, it is difficult to distinguish between the two as compared with Examples 1 to 5. Therefore, it is difficult to visually recognize the image of "double" characters. Thus, the "visibility of the copy" in Comparative Example 3 is an "Δ" evaluation.

Further, the evaluation results of Comparative Example 4 were "Δ" evaluation for "invisibility of the original" and "Δ" evaluation for "visibility of the copy". Here, in Comparative Example 4, the line width and density of the double line constituting the background portion are thicker and higher than that in Example 1, and the line width and density of the latent image portion are also thicker and higher. Therefore, the existence of the anti-counterfeit image can be known relatively easily. The line widths of the background portion and the latent image portion are narrower than those of Comparative Example 1 described above, and both the background portion and the latent image portion are composed of double lines. Although it is difficult to distinguish, the line width is thick as described above, so it is easy to see the latent image part when you get used to it. Thus, the "invisibility of the original" in Comparative Example 4 is a "Δ" evaluation.
On the other hand, in Comparative Example 4, one of the double lines of the latent image portion having a wide line width is clearly copied as compared with the other, but the density of the background portion is high, so that the background portion is also clearly copied. It will be copied. Therefore, in the copy, both the background part and the latent image part are reproduced relatively clearly, and it is difficult to distinguish between them, but if you get used to it, you can see the image of "double" characters. Thus, the "visibility of the copy" in Comparative Example 4 is an "Δ" evaluation.

According to the evaluation results described above, it is clear that the configurations of Examples 1 to 5 have both an effect of camouflaging the latent image portion and an effect of clearly reproducing the latent image portion when copied. Is. Therefore, the anti-counterfeit printed matter 1 of Examples 1 to 5 can conceal the latent image portion from the original and prevent counterfeiting due to copying, as compared with relatively 1 to 4.

The present invention is not limited to the above-described examples, and configurations other than the above-mentioned examples can be appropriately modified and implemented within the scope of the gist of the present invention.
For example, in Examples 1 to 5 described above, the adjacent pitch P1 and the inter-line pitch P2 are set with reference to the center of each line width of the continuous line and the broken line, but the present invention is not limited to this, and the continuous line and the broken line are not limited to this. It may be set with reference to one side edge. Even if the pitches P1 and P2 are set with reference to one side edge of each line in this way, the anti-counterfeit image can be provided in the same manner as in Examples 1 to 5 described above, and the same effect can be obtained.

1 Anti-counterfeit printed matter 2A-2E Anti-counterfeit image 11 Background part 12, 32, 42, 52, 62 Latent image part 210,000 lines 22, 25, 35, 45, 55, 65 Double lines 23, 26a, 26b, 36a, 36b, 46, 56, 66 Continuous line 47, 57, 67 Dashed line P1 Adjacent pitch (pitch between adjacent double lines)
P2 Line-to-line pitch (double-line pitch)

Claims (5)

It is provided with an anti-counterfeit image composed of a double line consisting of two parallel lines at a predetermined pitch arranged in parallel at a pitch wider than the pitch between the double lines.
The anti-counterfeit image is
The background portion in which the lines constituting the double line of the 10,000 lines have substantially the same line width and the ratio of the area of the lines constituting the double line of the 10,000 lines per unit area is 15% or less.
The double line of the 10,000 lines is composed of two lines having different line widths, and the ratio of the area of the lines constituting the double line of the 10,000 lines per unit area and the unit in the area of the background portion. An anti-counterfeit printed matter comprising a latent image portion in which the difference from the ratio of double lines of 10,000 lines per area is in the range of -5% to + 5%. The anti-counterfeit image is characterized in that the pitch between adjacent double lines is in the range of 1.1 to 1.5 times the pitch between the lines constituting the double line. The anti-counterfeit printed matter according to claim 1. The double line of the latent image portion is a continuous line in which one line is equal to or thicker than the line width of the double line in the background portion, and the other line is thinner than the one line. The anti-counterfeit printed matter according to claim 1 or 2, wherein the line width is a continuous line or a broken line having a line width narrower than one of the lines. The double line of the latent image portion is a continuous line in which one line is a broken line thicker than the line width of the double line in the background portion and the other line is narrower than the one line. The anti-counterfeit printed matter according to claim 1 or 2, characterized in that. The anti-counterfeiting according to claim 3 or 4, wherein the double line of the latent image portion has a line width narrower than that of the double line of the background portion. Printed matter.

Images