JPH06247088A - Printed matter - Google Patents

Abstract

PURPOSE:To provide a printed matter which effectively restrains copying of the same against malicious copying practice. CONSTITUTION:Patterns 4a to 4f, which are different from one another at a resolution level by a copying apparatus, are used as a copy restraining pattern, and dots of a screen tint and line intervals, or the thickness of numerous lines and line intervals, which constitute these patterns, are gradated. Therefore, the patterns 4a to 4f of a printed matter 2, which are copied on a copying material, are different from one another according to the resolution level of a copying apparatus, and a copy can be easily discriminated.

Description

Detailed Description of the Invention

The present invention relates to printed matter having a copy restraint pattern that substantially nullifies the abuse of counterfeit copies by copiers.

[0002]

2. Description of the Related Art With the improvement of resolution (resolution or resolution) and color reproducibility of a copying machine such as a color copying machine, various documents can be finely copied. On the other hand,
There is a problem of malicious use of securities such as checks, stock certificates, or important documents such as deeds of letters by malicious (inconvenient) copying.

Various attempts have been already proposed to make copying difficult in order to prevent such abuse. For example, Japanese Patent Application Laid-Open No. 53-142237 discloses different gradations for a background pattern of a flat screen having a narrow pitch, for example, 133 lines / inch, and a warning pattern for a flat screen having a wide pitch, for example, 65 lines / inch. Disclosed is a method of combining camouflage in addition to the combination of patterns included therein to make reproduction by a color copier difficult. Background patterns with a narrow pitch and halftone dots that make up camouflage cannot be copied by a color copying machine, and halftone dots that make up a wide pitch warning pattern are copied by a color copying machine to reveal the warning pattern. It can be identified as a duplicated document.

In addition, Japanese Patent Publication No. 62-19643 discloses
Disclosed is a method in which a latent image appears when a copy is made, although it is not visible in a visual state. That is, by making a copy, it is possible to easily identify the copy.

[0005]

The improvement of the performance of the copying machine is tremendous, and the resolution thereof is greatly improved. On the other hand, the resolution level of the copying machine is various. The method disclosed in Japanese Patent Laid-Open No. 53-142237 uses a warning pattern with different resolution levels by the copying machine and its background pattern. Therefore, in order for the copying warning pattern to appear, the copying machine uses the warning pattern. And the background pattern must have a resolution capable of copying only one of the patterns. Since the resolution of the copying machine changes according to the technological progress of the copying machine, it is not easy to determine the resolution level of the warning pattern and the background pattern by the copying machine. Further, there are various copying machines having different performances, and it is usually unknown whether a printed matter is copied by a copying machine having any performance.

In the method disclosed in Japanese Patent Publication No. 62-61943, since the latent image of the original printed matter cannot be visually inspected, it cannot be visually inspected whether or not it was copied by a copying machine.

The present invention solves the above-mentioned problems, and provides a copy restraint pattern in which the copy restraint effectively functions even with a copying machine having various performances or for improving the performance of the copying machine. A printed matter having the above is provided.

[0008]

In the printed matter of the present invention, gradation is added so that the pitches of the flat screens or lines forming a plurality of patterns are different from each other in resolution level by optical copying. Formed.

[0009] Preferably, the area of each point of the flat screen forming the plurality of patterns, or the individual thickness of the line is different so that the patterns have different resolution levels by a copying machine. Further, it is formed with gradation.

Preferably, the plurality of patterns are
The gradations are formed so as to change sequentially and stepwise.

Further, preferably, the gradations of the plurality of patterns are formed so as to be synchronized with each other.

Further, specifically, a character, a symbol, or a graphic formed by combining the patterns is formed.

Further, specifically, the plurality of patterns are formed in combination with a camouflage pattern such as a wood grain pattern, a linear pattern or a sand pattern pattern.

[0014]

The copying performance of the copying machine depends on the area of the halftone dots of the flat screen or the thickness of the lines (exemplified by halftone dots below). For example, among a plurality of patterns formed on a printed matter with different pitches of flat screens and different areas of halftone dots of flat screens, a pattern composed of a flat screen having halftone dots having an area less than the resolution of the copying machine is a copying machine. The pattern which is not copied by the copying machine and is composed of a flat net having halftone dots having an area larger than that of the disassembly of the copying machine is copied by the copying machine. Therefore, when a copying machine with low performance is used, the number of patterns that are not copied increases. When a high-performance copying machine is used, the number of uncopied patterns is reduced. For example, forming a pattern composed of a flat screen having halftone dots whose area is less than the resolution of the highest-performance copying machine. Then, some patterns are not copied. Further, even when the pattern is copied, the shape of the halftone dots formed on the original printed matter is not accurately copied, and, for example, a halftone dot is solidly copied. From the above, no matter which copier is used to copy a printed matter with the copy restraint pattern, it is possible to easily visually identify whether it is the original printed matter or the copied printed matter, or to identify with a magnifying glass.

When a plurality of patterns are synchronized with each other by changing the pitch of halftone dots and the size of halftone dots of the flat screens forming them and synchronizing them with each other, the original printed matter is composed of different flat screens. Since it is not easy to visually identify that the printed matter is present, the aesthetic appearance of the printed matter is not impaired. On the other hand, when copying is performed by a copying machine, a copy pattern corresponding to the size of the halftone dots forming each pattern appears, so that the copied printed matter can be easily identified.

Furthermore, when the above-mentioned pattern is formed in combination with a camouflage pattern, for example, a wood grain pattern, a linear pattern, a sand pattern pattern or the like, the pattern can hardly be discerned in the visual state, and the copy restraint function is further improved. on the other hand,
When the printed matter formed in this way is copied, as described above, a copied pattern corresponding to the size of the halftone dots forming each pattern appears, so that the copied printed matter can be easily identified.

[0017]

EXAMPLE A first example will be described. Figure 1 (A)
The top view of the printed matter of this example is shown in FIG. As shown in FIG. 1A, the printed matter 2 is formed with gradations of patterns 4a to 4f each composed of a flat screen having different resolution levels by a copying machine. The "flat mesh" is composed of halftone dots having the same line spacing and halftone dots having the same size. Further, the flat screens forming the patterns 4a to 4f are respectively configured in synchronization with each other, and it is not easily visually recognized that the patterns 4a to 4f are composed of flat screens having different gradations. .

FIG. 1B is a diagram showing the number of halftone dots per inch of a flat net which constitutes the patterns 4a to 4f of the portion along the line YY of the printed matter 2 shown in FIG. Figure 1 (C)
Figure 2 shows the size of halftone dots on a flat screen. As shown in FIG. 1B, the number of mesh lines per inch increases from the inner pattern 4a to the outer pattern 4f, that is, the interval between the mesh lines decreases. Further, as shown in FIG. 1C, the size of the halftone dot decreases from the inner pattern 4a toward the outer pattern 4f.

FIG. 2 illustrates flat screens forming patterns 4a to 4f, respectively. As shown in FIG. 2, pattern 4a
~ 4f is 2 in each of the patterns 4a to 4f.
It is composed of halftone dots 10a to 10f formed at the same interval dimensionally and halftone dots 12a to 12f formed to the same size. Pitch (line spacing) P of mesh wires 10a to 10f
100, P85, P70, P55, P40, P25 are
For example, 50 lines / inch (or DP
I: Dot Per Inch), 75 lines / inch, 100 lines / inch, 125 lines / inch, 150 lines / inch, 175 lines /
Inches.

The halftone dots 12a-12f have patterns 4a-4.
All patterns 4a-4 so that f are synchronized with each other.
Halftone dots 10a to 10f such that the total sum of the areas of halftone dots 12a to 12f existing in the same size range of f is almost equal.
It has an area corresponding to the pitch. For example, pattern 4
The total area of the halftone dots 12a existing within the predetermined range of a and the total area of the halftone dots 12b existing within the predetermined range having the same size as the pattern 4a of the pattern 4b become equal. Therefore, in the patterns 4a to 4f, the pitch of the halftone lines 10a to 10f becomes shorter as going from the pattern 4a to the pattern 4f, and accordingly, the areas of the halftone dots 12a to 12f also become smaller.

As described above, in the printed matter 2, the pattern 4a is formed.
~ 4f are formed so as to be "tuned", so that it is visually observable that the flat meshes forming the patterns 4a to 4f are composed of different mesh lines 10a to 10f and halftone dots 12a to 12f. Although visible, it is usually difficult to visually identify.

Of the halftone dots 12a to 12f illustrated in FIG. 2, for example, 12e and 12f cannot be identified even at the resolution level L1 of the highest performance color copying machine. Further, preferably, the halftone dots 12a and 12b can be identified by the resolution level L3 of the lowest color copying machine. Also, the halftone dots 12a, 12
b and 12c are resolution levels L of a standard color copying machine.
It can be identified by 2.

FIGS. 3 (A) to 3 (C) respectively show copies of the above-mentioned printed matter 2 copied by a color copying machine having resolution levels L3, L2 and L1. Note that FIG. 3 (A)
The shaded portions in (C) to (C) indicate the copied portions. As shown in FIG. 3A, when a color copying machine having a resolution level L3 is used for copying,
Since the halftone dots 12c to 12f having the resolution level L3 or lower cannot be reproduced, only the patterns 4a and 4b are copied almost solidly, but the outer patterns 4c to 4f are not copied.
Therefore, when copying with a copying machine of this resolution level L3, it can be visually confirmed that the copy is made, and this is effective as a copy check pattern.

As shown in FIG. 3B, the resolution level L
When copying with a color copying machine of No. 2, halftone dots 12d to 12f having a resolution level of L2 or less cannot be reproduced with the color copying machine, so only the patterns 4a to 4c are copied in a solid pattern, but the outer patterns. 4d to 4f are not copied. Therefore, even when the image is copied by a copying machine having this resolution level L3, it can be visually confirmed that the image has been copied, which is effective as a copy check pattern.

As shown in FIG. 3C, the resolution level L
When copying with the color copying machine of No. 1, since the halftone dots 12e and 12f having the resolution level L1 or less cannot be reproduced with that color copying machine, only the patterns 4a to 4d are copied in a solid pattern, but the outer patterns. 4e and 4f are not copied. When the distance between the pattern 4f and the pattern 4d is very short, it is not always easy to visually identify that the outer patterns 4e and 4f are not copied, but the size of the shape of the copied part Is accurately measured using a measuring instrument or the like, and the shapes of the halftone dots 12a to 12d of the copied patterns 4a to 4d are inspected using a magnifying glass or the like, the halftone dots 12a to 12d which should be present. Since it does not exist, it can be sufficiently identified as a copy.

Further, the copied patterns 4a to 4d shown in FIG. 3C are the same as the pattern 4a in the printed matter 2.
Since the size of halftone dots 12a to 12d of .about.4d increases from halftone dot 12d to halftone dot 10a, there is a tendency for clear copying from pattern 4d to pattern 4a. Therefore, in the printed matter 2, since the patterns 4a to 4f are synchronized, the patterns 4a to 4f
It is difficult to visually recognize that the gradation of f is different, but when the patterns 4a to 4f are copied, the difference in gradation appears as a difference in sharpness, so that it is possible to easily identify that the copy has been made.

Since the patterns 4a to 4f are configured in synchronization with each other, it is difficult to visually recognize that the patterns 4a to 4f formed on the printed matter 2 have different gradations. Pattern 4a composed of tones
4f is copied as a different pattern that can be visually identified, and effectively functions as a copy check pattern.

As described above, the printed matter 2 having the above-described copy restraint pattern effectively exhibits the copy restraint function even in a color copying machine or a monotone copying machine having various resolutions. In the future, a color copier or a monotone copier having a resolution higher than the resolution level L1 may appear. In this case,
Although the diagonal lines shown in the copy portion shown in (C) spread further outward, it is easy to identify the duplicate because of the difference in the sharpness of the copied pattern. Further, when the copied portion is inspected with a magnifying glass or the like, it is possible to identify whether it is a duplicate or not, as described above. That is, even if the resolution of the color copying machine is improved, the plurality of patterns formed with gradation so that the resolution levels by the copying machine described above are different,
The copy restraint will be effective in the future without changing the pattern of the printed matter 2.

The shapes of the halftone dots 12a to 12f shown in FIG. 2 are not limited to circles, but can be various other shapes. For example, as shown in FIG. 4, individual shapes of halftone dots are made into “petal-like” shapes and, as shown in FIG. 2, gradation is added. Since petal-like shapes are close to each other, even a color copier having a considerably high resolution tends to copy adjacent petals into a shape close to a circle when copying. Therefore, when the duplicate is inspected with a magnifying glass, it can be identified as the duplicate.

The second embodiment will be described. FIG. 5 shows a plan view of the printed matter of this embodiment. As shown in FIG. 5, on the printed matter 22, patterns 24b to 24f corresponding to the shape of the pattern 24a are sequentially formed outside the T-shaped pattern 24a, and one character "T" is formed in the patterns 24a to 24f.
Is formed. The patterns 24a to 24f are, for example, the patterns 4a to 4f of the above-described printed matter 2 shown in FIG.
And the same flat mesh respectively.

5A to 5C, the resolution levels L3. A copy of the above-mentioned printed matter 22 is copied by an L2 and L1 color copying machine. The shaded portions in FIGS. 5A to 5C indicate portions that are not copied, as in FIG. In this case, the same effect as that of the first embodiment described above can be obtained for the character "T" formed by the patterns 24a to 24f on the printed matter 22. As shown in FIG. 5A, when copying is performed by a color copying machine having a resolution level L3,
In the color copying machine, halftone dot 1 with resolution level L3 or less
Since patterns 2c to 12f cannot be reproduced, patterns 24a and 2f
Although only 4b is copied in a substantially solid state, the outer patterns 24c to 24f are not copied, and are copied in a "T" shape which is considerably smaller than the "T" shape of the printed matter 22. Therefore, when copying with a copying machine of this resolution level L3, it can be visually confirmed that the copy is made, and this is effective as a copy check pattern.

As shown in FIG. 5B, the resolution level L
When copying with the color copying machine of No. 2, since the halftone dots 12d to 12f having the resolution level L2 or less cannot be reproduced with the color copying machine, only the patterns 24a to 24c are copied in a solid pattern, but the outer patterns are printed. 24d to 24f are not copied, but are copied to a "T" shape smaller than the "T" shape of the printed matter 22. Therefore, even when the image is copied by a copying machine having this resolution level L3, it can be visually confirmed that the image has been copied, which is effective as a copy check pattern.

As shown in FIG. 5C, the resolution level L
When the color copying machine 1 is used for copying, the dot 12f having the resolution level L1 or lower cannot be reproduced by the color copying machine, so only the patterns 24a to 24d are copied in a solid pattern, but the outer pattern 24e, 4f is not copied,
It is copied to a “T” shape slightly smaller than the “T” shape of the printed matter 22. Therefore, when the distance between the pattern 4f and the pattern 4d is very short, the outer patterns 4e and 4f are formed.
It is not always easy to visually identify that the dots are not copied, but as in the first embodiment described above, the shapes of the halftone dots 12a to 12d inspected by using a magnifying glass or the like, or It is possible to discriminate that the image is copied from the difference in sharpness of the pattern.

The third embodiment will be described. Figure 6
A plan view of the printed matter of this embodiment is shown in FIG. FIG. 7 (A)
As shown in FIG. 3, the printed matter 32 has patterns 34a to 34f formed of lines having gradations having different resolution levels by the copying machine. The “lines” forming each of the patterns 34a to 34f are composed of a plurality of lines having the same line spacing and the same thickness in each of the patterns 34a to 34f. In addition, patterns 34a to 3
The lines constituting 4f are arranged in synchronization with each other, and it is not easy to visually identify that the patterns 34a to 34f are lines having different gradations. FIG. 7B is a diagram of the number of lines per inch of parallel lines that form the patterns 34a to 34f of the portion along the line CC of the printed matter 32 shown in FIG.
The line thickness is shown in (C). As shown in FIG. 7B, the number of lines per inch increases from the inner pattern 34a to the outer pattern 34f, that is, the line interval decreases. Further, as shown in FIG. 7C, the inner pattern 34a to the outer pattern 34a
The line becomes thinner toward f.

FIG. 8 illustrates lines that form the patterns 34a to 34f, respectively. As shown in FIG. 8, the patterns 34a to 34f are respectively the patterns 34a to 34f.
In the line 42a with the same spacing and the same thickness.
.About.42f. Lines 42a to 42f pitch (line spacing) P100, P85, P70, P55, P4
0 and P25 are, for example, 50 lines / inch (or DPI: Dot Per Inch), 75 lines / inch, respectively.
100 lines / inch, 125 lines / inch, 150 lines / inch, and 175 lines / inch.

Lines 42a-42f are patterns 4a-4.
All patterns 34a ...
Lines 32a to 32 existing in the same size range of 34f
Parallel lines 42a to 4 such that the total area of f is almost equal
It has a thickness corresponding to the pitch of 2f. For example, the sum of the areas of the parallel lines 42a existing within the predetermined range of the pattern 34a and the sum of the areas of the parallel lines 42b existing within the predetermined range having the same size as the pattern 34a of the pattern 34b become equal. Therefore, in the patterns 34a to 34f, the line 42 is moved from the pattern 34a to the pattern 34f.
Since the pitch of a to 42f becomes short, the thickness of the parallel lines 42a to 42f becomes small accordingly.

As described above, in the printed matter 32, the patterns 34a to 34f are formed so as to "tune" like the printed matters 2 and 22 described above, and thus the patterns 34a to 34f are formed.
The fact that the lines forming 34f are formed with different intervals and different thicknesses can be visually observed when carefully viewed, but usually, it is difficult to visually identify them.

Of the lines 42a to 42f illustrated in FIG. 8, for example, lines 42e and 42f cannot be identified even at the resolution level L1 of the color copying machine having the highest performance. Further, preferably, the lines 42a and 42b can be identified by the resolution level L3 of the lowest color copying machine. The line 42
a, 42b and 42c can be identified by the resolution level L2 of a standard color copying machine.

When the printed matter 32 is also copied by a color copying machine having various resolutions, the same copying as in FIGS. 3A to 3C is performed. Therefore, the pattern using such lines also effectively exhibits the copy restraint function, as in the case of using the flat screen.

The fourth embodiment will be described. In the above-described embodiment, an example is shown in which halftone dots or lines of the above pattern are printed on a base printing paper that is hardly copied even if it is copied, such as a white background or a light yellow background, or that is difficult to copy. It was In the fourth embodiment, FIG.
As shown in, the radial wavy line pattern is formed by combining the above-mentioned components of the paran. As a forming method,
A method of forming and printing the camouflage pattern and the pattern on the same plate, or preparing different plates for the camouflage pattern and the pattern and overprinting the pattern on the camouflage pattern, or the camouflage pattern on the pattern There is a method of overprinting. A combination of such a wavy pattern and a pattern is visually
The wavy line pattern is emphasized and visually recognized, and the pattern is hardly discernible. That is, in a normal state, the radial wavy line pattern is emphasized and visually recognized, and the radial wavy line pattern increases the camouflage effect. Increase. On the other hand, when such a printed matter is copied, as described above, the patterns appear in addition to the copy of the radial wavy line pattern depending on the printing state of the halftone dots or the lines, so the above-mentioned copy restraint pattern The function as is still maintained.

As the camouflage pattern such as the above wavy line pattern, various other patterns such as a wood grain pattern as shown in FIG. 10 or a sand pattern pattern can be applied.

As the color of the radial wavy line pattern shown in FIG. 9, in addition to the color clearly reproduced and copied when copied, for example, dark yellow is printed and when viewed, the yellow color is While the camouflage function for visual observation is considerably emphasized, yellow has a relatively low copy reproducibility when copied, so it is copied lightly and the copy state of halftone dots or lines clearly appears according to those patterns. It is also possible to put it out and put it in a copy state similar to that when the above-mentioned pattern is printed on almost a white background. That is, the color of the camouflage pattern is not particularly limited as long as it does not hinder the appearance of the above-described pattern.

As another embodiment of the camouflage pattern, a camouflage pattern having a white grain pattern as shown in FIG. 11A is used, and the camouflage pattern and characters as shown in FIG. 11B are used. As shown in FIG. 11C, in combination with the copy restraint pattern in which the density of “COPY” (size of halftone dots or thickness of lines) becomes lower (smaller or thinner) from the upper side to the lower side. In addition, the copy restraint pattern may be partially exposed from the white portion of the camouflage pattern. When a printed matter as shown in FIG.
As shown in (A) and (B), in addition to copying the grain pattern according to the printing state of the dots or lines that are the constituent elements of the copy restraint pattern, the copy restraint pattern (“COP
Y ”) appears, the function as the copy restraint pattern is still maintained, and the camouflage effect that makes it difficult to visually identify the copy restraint pattern by the grain pattern is exhibited. Note that FIG.
FIG. 12B is a duplicate when the printed matter shown in FIG. 11C is printed at high density, and FIG. 12B is a duplicate when the printed matter shown in FIG. 11C is printed at low density. FIG. 12 (A),
As shown in (B), the copy restraint pattern appears in addition to the copy of the grain pattern according to the printing state of the dots or lines that are the constituents of the copy restraint pattern.
The function as the copy restraint pattern is still maintained.

The pattern formed on the printed matter is not limited to the above-mentioned one, and other patterns such as characters, symbols and figures may be used.

Further, the colors of the flat meshes or lines forming the patterns may be different among the patterns.

Further, the case where the gradation of the flat screen or the parallel lines constituting the pattern is sequentially and stepwise changed has been exemplified, but the change of the gradation of the flat screen or the parallel lines may not be stepwise. Good.

Further, although the case of a color copying machine is exemplified as the optical copying, when the monotone copying copy restraint pattern of the present invention is also copied using a monotone copying machine, the same as above. The copy restraint pattern of the present invention effectively exhibits the copy restraint function.

The case where a plurality of patterns are synchronized with each other has been exemplified as the printed matter having the copy restraint pattern of the present invention, but the plurality of patterns need not necessarily be synchronized with each other. When synchronized, there is an advantage that it is difficult to visually identify, but from the viewpoint of the copy restraint function, it is not necessary to synchronize, and multiple patterns are given different gradations and different resolution levels are obtained by copying. It suffices if a net or lines are formed.

[0049]

As described above, according to the present invention, with respect to the halftone dots or the line widths of the flat nets forming the plurality of patterns which are the copy restraint patterns, the resolution level by optical copying between the patterns. By changing the values so as to be different from each other, it is possible to provide a printed matter that enables effective copy restraint even for optical copying with various resolutions. In particular, by adjusting the size and line spacing of the halftone dots that form a plurality of patterns, or the thickness and line spacing of the lines, to synchronize the plurality of patterns, the original printed matter These patterns are not easily visually recognizable, and when copied, a pattern having large halftone dots or thick lines is exposed, and the copied printed matter can be easily identified.

[Brief description of drawings]

FIG. 1A is a plan view of a printed material in which a plurality of screens having different resolution levels are formed according to the first embodiment.
FIG. 1B is a diagram showing the number of mesh wires per inch, FIG.
(C) is a diagram showing the size of the halftone dot.

FIG. 2 is a diagram for explaining in detail a flat screen of the printed matter shown in FIG.

3A and 3B are diagrams showing respective copy states when the printed matter shown in FIG. 1A is copied by a copying machine having a different resolution.

FIG. 4 is a diagram showing another shape of a halftone dot of a flat screen.

FIG. 5A is a plan view of a printed material in which a plurality of screens having different resolution levels are formed according to the second embodiment.
FIG. 5B is a diagram showing the number of halftone wires per inch, FIG.
(C) is a diagram showing the size of the halftone dot.

6A and 6B are diagrams showing respective copying states when the printed matter shown in FIG. 5A is copied by copying machines having different resolutions.

FIG. 7 (A) is a plan view of a printed material on which lines having different resolution levels are formed according to the first embodiment, and FIG.
Shows the number of lines per inch, FIG. 7 (C)
Is a diagram showing the thickness of the line.

FIG. 8 is a diagram for explaining in detail the lines of the printed matter shown in FIG.

FIG. 9 is a diagram showing a radial pattern as a first example of a camouflage pattern as a fourth embodiment.

FIG. 10 is a diagram showing a grain pattern as a second example of the camouflage pattern as the fourth embodiment.

FIG. 11A is a camouflage pattern with a white grain pattern, and FIG. 11B is a copy check pattern.
(C) is the camouflage pattern shown in (A),
It is a printed matter printed in combination with the copy restraint pattern shown in (B).

FIG. 12 (A) is a duplicate of the printed matter shown in FIG. 11 (C) printed at high density, and FIG. 12 (B) is shown in FIG. 11 (C).
It is a duplicate of the printed matter shown in (1) when printed at low density.

[Explanation of symbols]

2, 22, 32 ... Printed matter 4a to 4f, 24a to 24f, 34a to 34f ... Patterns 10a to 10f ... Halftone lines 12a to 12f ... Halftone dots 42a to 42f ... All lines

Claims (6)

[Claims] 1. A printed matter characterized by being formed with gradation so that the pitch of the meshes or lines forming a plurality of patterns is different so that the resolution levels by optical copying are different between the patterns. . 2. The area of each point of the flat mesh forming the plurality of patterns, or the individual thickness of the line is so different that the resolution level by the copying machine is different between the patterns. The printed material according to claim 1, wherein the printed material is formed with a tone. 3. The printed matter according to claim 1, wherein the plurality of patterns are formed so that gradations thereof are sequentially and stepwise changed. 4. The printed matter according to claim 1, wherein the gradations of the plurality of patterns are formed so as to be synchronized with each other. 5. The printed matter according to any one of claims 1 to 4, wherein characters, symbols, and figures formed by combining the patterns are formed. 6. The printed matter according to claim 1, which is formed by combining the pattern and a camouflage pattern.