JP3390500B2 - Printed matter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed matter having a copy restraint pattern which substantially invalidates malicious copying by a copying machine.

[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, it has become a problem to maliciously (inconveniencely) copy important documents such as checks, stock certificates, and other important documents such as deeds, and then misuse the copies.

In order to prevent such abuse, various attempts have been proposed to make copying difficult or to restrain copying. For example, JP-A-53-142237
The publication discloses a first warning mark for a flat screen having a narrow pitch, for example, 133 lines / inch (or DPI: dot per inch), and a second warning for a flat screen having a wide pitch, for example, 65 lines / inch. Camouflage (hidden pattern) for a mixed mark that is a mixture of two warning marks with a mark
Disclosed is a technique intended to suppress malicious copying because the warning mark is clearly copied when the printed matter is copied while the patterns are combined to make the warning mark of the printed matter difficult to see.

[0004]

The improvement of the performance of the copying machine is tremendous, and the resolution thereof is greatly improved. JP-A-5
In the method disclosed in Japanese Patent Laid-Open No. 3-142237, since the mark is formed by using a flat screen, if the malicious copying is effectively prohibited, for example, the copying is performed with a halftone dot pitch that is difficult to copy by a copying machine. There is a need. That is, it becomes necessary to make the pitch of halftone dots finer. This leads to a competition between printing technology and the performance of color copiers, and it is always necessary to print documents to match the performance of modern copiers. This also causes the problem that when printed previously, a document printed with a pattern effective as a copy restraint pattern will soon become invalid due to the development of color copier technology.

Further, when a copy restraint pattern is manufactured to restrain malicious copying against a high-performance copying machine or to cope with difficulty, a low-performance copying machine may not be effective.

Further, there are various copying machines having different performances, and it is generally unknown which copying machine the document is to be copied by. Even if malicious copying is attempted, a copying machine according to the importance of the document should usually be used. Therefore, it is not appropriate from the manufacturing cost of printed matter to always print the copy restraint pattern corresponding to the copier having the latest performance on all printed matters.

The present invention solves the above-mentioned problems, is appropriate as a manufacturing price (printing price), and can improve the performance of a copying machine with a copying machine having various performances or in the future. Also provided is a printed matter having a copy restraint pattern in which the copy restraint function continues to function effectively.

[0008]

According to the present invention, at least two patterns composed of halftone dots or lines are printed, and the number of halftone dots or lines forming the pattern is different, There is provided a printed matter in which the area ratio of halftone dots or lines in the pattern changes in a slanted manner in the pattern.

Preferably, all of the halftone dots or lines forming the at least two patterns have the same color, and the at least two patterns have the same area ratio of the halftone dots or lines in at least adjacent portions. Becomes

Further, in the printed matter of the present invention, preferably, the size or thickness of the changing component in the pattern includes a size that cannot be copied by a copying machine.

Preferably, the size or thickness of the changing halftone dots or lines in the pattern includes a size or thickness that cannot be copied by a copying machine.

More preferably, one of the at least two patterns constitutes the background of the printed matter with halftone dots or lines having a smaller halftone dot pitch or mesh pitch than the other pattern. A latent image pattern such as a character or a figure is formed with halftone dots or lines having a larger halftone dot pitch or halftone dot pitch than the pattern forming the background portion of the two patterns.

Preferably, one of the at least two patterns constitutes the background of the printed matter with halftone dots or lines having a larger halftone dot pitch or mesh pitch than the other pattern, Characters with halftone dots or halftone dots or lines that are smaller than the pattern that constitutes the background part of the two patterns,
It forms a latent image pattern such as a figure. Also preferably,
The pattern and a camouflage pattern for making it difficult to identify the pattern are formed in combination.

[0014]

The copying performance of the copying machine depends on the components, specifically, the area of the halftone dot or the thickness of the line (hereinafter, exemplified by the halftone dot). In the present invention, since the area of the halftone dots is changed in a slanted or stepwise manner, some areas cannot be copied by the copying machine and some areas can be copied depending on the size of the area of the halftone dots. In other words, since the pattern of the present invention is not a flat screen but has an inclined shape or a stepwise change, a copyable portion and a non-copyable portion are formed depending on the resolution of the copying machine. The size (density) of the halftone dots to be resolved also changes depending on the optical characteristics (density setting) of the copying machine. For example, if you use a low-performance copier,
There are many areas that cannot be copied. Further, even if the copy setting is lowered and copying is performed, there are many portions that cannot be copied. further,
When a high-performance copying machine is used, a considerable portion is copied, but since the area of the halftone dots or the line width includes a portion that cannot be copied by the copying machine, some portions cannot be copied. Further, when the density setting is increased and copying is performed, the size of the halftone dots to be resolved becomes large, so that the copy is made in a solid pattern.
From the above, even if the printed matter having the copy restraint pattern is copied by any of the copying machines, it can be easily visually identified by a magnifying glass whether or not the printed matter is a copy of the original printed matter.

When the halftone dots of the two patterns are synchronized, it is difficult to visually identify those patterns of the original printed matter, but when copied with a copying machine, the size of the halftone dots or the thickness of the lines are made. Since a copy pattern corresponding to the above appears, the copied print can be easily identified by comparing the original print and the copy. When the two patterns are synchronized,
The area size or the line thickness of the halftone dots forming the pattern formed at the large pitch is larger than the area size or the line thickness of the halftone dots forming the pattern formed at the small pitch. Therefore, when copied, the pattern formed with a large pitch appears more clearly as a copied image.

If the changing dot size or line thickness in the pattern includes a size that cannot be copied by a copying machine, even if copying is performed by a high performance copying machine, Since there are some parts that cannot be printed out, it is easy to see that this is a copy.

One of at least two patterns constitutes the background of the printed matter, and
When the other pattern of the two patterns is a pattern of characters, figures, etc., in a synchronized state,
Visually, the other pattern melts into the background and is difficult to identify, but when a copy is taken, it clearly floats, so it can be easily seen as a copy. Especially, the background, characters, and figures
When two patterns are synchronized, the size of the halftone dots or the line width that forms the pattern of characters, figures, etc. formed with a large pitch is the halftone dot that forms the background pattern formed with a small pitch. Larger than the size of the area or the thickness of the line. Therefore, when copied, the pattern of characters, figures, etc. formed with a large pitch is more
Since the image appears more clearly as a copied image, when a pattern such as a character or a figure which is indistinguishable from the original printed matter by being blended into the background is copied, it clearly appears and a copy can be easily identified.

Further, the above-mentioned pattern can be visually observed with the naked eye.
When combined with camouflage patterns, such as camouflage patterns such as wood grain patterns, linear patterns, and sand pattern patterns, almost no patterns can be discerned visually, and the copy restraint function is further improved. On the other hand, when the printed matter formed in this way is copied, a copy result corresponding to the above-mentioned synchronized state is obtained.

[0019]

EXAMPLE FIG. 1A shows a plan view of a printed matter 2 on which a pattern is formed using halftone dots as a first embodiment of a preferred embodiment of a printed matter having a copy restraint pattern of the present invention. Thus, in this embodiment, halftone dots are used as constituent elements. The printed matter 2 has a background 4 as an example of the first pattern.
And a rectangular figure 6 as an example of the second pattern. The background 4 and the rectangular figure 6 are “plucked”. In FIG. 2, the background 4 and the rectangular figure 6 are adjacent to each other, that is, the part that constitutes the background 4 of the part of the line along both sides of the line Y-Y, that is, the high density portion 43 at the upper end, the intermediate density inside. A portion 42 and a low-concentration portion 41 in the central portion,
The portions forming the rectangular figure 6, that is, the halftone dots of the low density portion 61 at the center and the high density portion 62 at the lower end are illustrated in detail.

As illustrated in FIG. 2, the background 4 has a center line C.
From the low-density portion 41 of the portion -C to the high-density portion 4 of the upper end
Up to 3, halftone dots 401 to 409 are formed at the same vertical mesh pitch P41, for example, the number of lines is 150 lines / inch (or DPI: Dot Per Inch). In this example, the horizontal mesh pitch P42 is also 150 lines / inch, which is the same as the vertical mesh pitch P41. These halftone dots 401
The color tone of the printing inks of .about.409 was printed in pink. The rectangular graphic 6 is formed from the low-density portion 61 at the center line C-C to the high-density portion 62 at the lower end at a vertical mesh pitch P61, for example, the number of lines is 65 lines / inch, and the halftone dots 601 to 603. There is. In this example, the mesh pitch P62 in the horizontal direction is 65 lines / inch, which is the same as the mesh pitch P61 in the vertical direction. The color tone of the printing ink of these halftone dots 601 to 603 was printed in the same pink color as the background color tone. That is, the mesh pitch P41 of the halftone dots 401 to 409 that form the background 4
Further, the mesh pitch P42 is narrow, the mesh pitch P61 and the mesh pitch P62 of the halftone dots 601 to 603 forming the rectangular graphic 6 are wide, and the background 4 and the rectangular graphic 6 are formed with different mesh pitches.

Along the both sides of the line Y-Y, the areas of the halftone dots 401 to 409 are increased from the position of the center line C-C to the upper end of the background 4, and the rectangular figure is drawn from the position of the center line C-C. The areas of the halftone dots 601 to 603 increase toward the lower end of No. 6. In order to make it difficult to visually distinguish the background 4 and the rectangular figure 6, it is sufficient to "tune" them. That is, for each certain unit area of the background 4 and the rectangular figure 6, the total area (area ratio) of the halftone dots contained therein may be substantially the same for the background 4 and the rectangular figure 6. For that purpose, each of the meshes forming the rectangular graphic 6 having a large mesh pitch is formed larger than the area of each of the halftone dots of the adjacent background 4. In this example, the background 4 has 150 lines.
Since the DPI and the rectangular figure 6 have the number of lines of 65 DPI (however, for the sake of illustration, in FIG. 2, the halftone dot pitch P41 and the halftone dot pitch P61 are about 1: 1.5), the tuning is performed. , The halftone dots of the rectangular graphic 6 are (150/65) ² ≈4.6 times the area of the halftone dots forming the adjacent background 4. The diameter of the halftone dot of the rectangular figure 6 is about twice as large as the diameter of the halftone dot forming the adjacent background 4.

The reason why the halftone dot pitch P61 of the rectangular graphic 6 is made larger than the halftone dot pitch P41 of the background 4 is that the size of the halftone dots composing the rectangular graphic 6 is larger than that of the halftone dots composing the background 4. Since it is large, the rectangular figure 6 appears more clearly when copied. In the original printed matter, the rectangular figure 6 is synchronized with the background 4, that is, the rectangular figure 6 melts into the background 4 so that the rectangular figure 6 is difficult to visually identify.
When a copy is made, it clearly appears so that it can be easily identified that there is a copy. For example, when a person who attempts malicious copying makes a copy of a rectangular graphic 6 that is difficult to identify due to the original printed matter being blended into the background 4, the rectangular graphic 6 appears, so that the malicious use is abandoned.

By changing the size of the above-described halftone dots in a slanted or stepwise manner, as shown in FIG. 1B as the density curve CV4 of the background 4 and the density curve CV6 of the rectangular figure 6, The density of the background 4 and the rectangular figure 6 is the center line C
There is almost no pattern at the -C position, but the pattern is formed so that the density (gradation) increases from the center line C-C toward the end. As a result, visually
The edges look dark pink and become light pink toward the center line C-C, and the center line C-C position is the color of the printed matter itself.
In this example, it appears white. In addition, since the background 4 and the rectangular figure 6 are synchronized so that the area ratios of their halftone dots are substantially the same, the rectangular figure 6 existing in the background 4 appears to be united with the background 4. In other words, with a magnifying glass, or even if you look carefully, you can see the background 4 and the rectangular figure 6
However, in a normal state, the rectangular graphic 6 blends into the background 4, and the background 4 and the rectangular graphic 6 are difficult to visually distinguish easily.

The sizes of the areas of the halftone dots 401 to 409 and the halftone dots 601 to 603 illustrated in FIG. 2 cannot be identified by the resolution level L1 of the current latest high-performance color copying machine. To 403 and halftone dots 601 to
602 is included. More preferably, a halftone dot 4 having an area that can be sufficiently identified by the resolution level L3 of the lowest color copying machine.
07-409 are included. The resolution level L2 indicates a resolution level between the highest resolution level L1 and the lowest resolution level L3.

FIGS. 3 (A) to 3 (C) respectively show copies of the above-mentioned printed matter 2 when the above-mentioned printed matter 2 is 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. However, it is shown that they are copied with the same density for the sake of illustration, and in reality, the density of the original background 4 and the original rectangular figure 6 is reproduced with the reproducibility according to the resolution level of the color copying machine described later. Shall be copied accordingly. As described above, since the rectangular figure 6 has halftone dots having a wider pitch than the background 4, and the background 4 and the rectangular figure 6 are in synchronization, in other words, the area of the halftone dots forming the rectangular figure 6 is Since it is larger than the area of the halftone dots that form the adjacent background 4,
Note that in the following, the rectangular figure 6 appears more clearly when copied.

As shown in FIG. 3A, the resolution level L
When copying with the color copying machine of No. 3, halftone dots having a resolution level of L3 or less cannot be reproduced with the color copying machine, so that the copy pattern is almost solid only in the high density portion 43 at the end of the background 4. However, the intermediate density portion 42 inside the background 4, the low density portion 41 at the center of the background 4, and the rectangular graphic 6 are not copied. Therefore, when copying with a copying machine of this resolution level L3,
It is known that the image is a copy, and it 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 having a resolution level of L2 or lower cannot be reproduced with that color copying machine.
Compared to the example shown in (A), the copy pattern has a high density portion 43 at the end of the background 4 to an intermediate density portion 4 inside.
The portion copied toward 2 is enlarged. However, the low-density portion 41 at the center of the background 4 and the rectangular graphic 6 are still not copied. Therefore, even if it is copied at the resolution level L2 or visually, it is found that it is a copy, and it is effective as a copy check pattern.

As shown in FIG. 3C, the resolution level L
When copied by the color copying machine No. 1, the copy pattern is the intermediate density portion 42 and the rectangular figure 6 inside the background 4.
Although the portion to be copied up to the high density portion 62 at the end of is expanded, the low density portion 41 at the center of the background 4 and the low density portion 61 at the center of the rectangular graphic 6 are not copied. Low-density part 4 in the center of background 4 that is not copied
It is not always easy to visually identify the presence of the low density portion 61 in the central portion of the rectangular graphic 6 and the original printed matter 2. However, by using a magnifying glass or the like, the shapes of the halftone dots of the high density portion 62 at the end of the rectangular figure 6 and the low density portion 41 at the center of the background 4 can be accurately identified. Therefore, if the copied printed matter is inspected using a magnifying glass or the like, there is no halftone dot that should be present, so that it can be easily identified as the copied one. In addition, the copied portion and the background 4 shown in FIG.
Areas of the halftone dots forming these portions are almost equal in the intermediate density portion 42 in the inside and the high density portion 62 at the end of the rectangular figure 6, but due to the difference in the mesh pitch, a rectangle having a wide mesh pitch is formed. The high density portion 62 at the end of the figure 6 is
There is a tendency for the image to be copied more clearly than the intermediate density portion 42 inside the background 4 having a narrow mesh pitch, and the copied portion can be easily identified visually. That is, the original printed matter 2
In the above, since the background 4 and the rectangular figure 6 are in synchronization with each other, the high-density portion 62 at the end of the rectangular figure 6 which is difficult to visually identify can be easily visually identified by copying. That is, even if a color copying machine having a high resolution level is used, the copy restraint pattern of the present invention effectively exhibits the copy restraint function.

As described above, the printed matter 2 having the above-mentioned copy restraint pattern effectively exhibits the copy restraint function even in a color copying machine or a monotone copying machine having various resolutions. Although the above example illustrates the case of copying a color printed matter by a color copying machine, the same applies to the case of copying by a monochrome copying machine.

In the future, a color copying machine or a monotone copying machine having a resolution higher than the resolution level L1 may appear. In this case, the slanted line showing the copy portion shown in FIG. 3C is enlarged to the vicinity of the center line CC. However, as described above, since the copied portion in the rectangular graphic 6 tends to be copied more remarkably than the copied portion of the background 4, it is easy to identify the copy. In addition, if the copied portion is inspected with a magnifying glass or the like, as described above, it is possible to identify whether or not the copied portion has been copied. That is, the above-mentioned copy restraint pattern having the two types of halftone dot pitches and the halftone dots having a changed area does not change the halftone dot pitch in the future even if the resolution of the color copying machine is improved. The copy restraint is effective.

The shapes of the halftone dots 401 to 409 and halftone dots 601 to 603 illustrated 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 “petal-like” shapes,
Moreover, gradation is added according to the position as shown in FIG. Since the petal-like shapes are close to each other, even in a color copying machine having a considerably high resolution, when copying, adjacent petals tend to stick to each other to form a shape close to a circle. Therefore, when the duplicate is inspected with a magnifying glass, it can be identified as the duplicate.

In the above embodiments, the halftone dots are used as the constituent elements of the pattern, but the constituent elements of the pattern of the present invention are not limited to the halftone dots. For example, "lines" may be used. The parallel line refers to one having a large number of lines in a certain unit area. FIG. 5A shows a plan view of a printed matter 12 on which a pattern is formed by using lines as a second embodiment of the preferred embodiment of the printed matter having the copy restraint pattern of the present invention. The printed matter 12 has a background (base) 14 as an example of the first pattern and a rectangular graphic 16 as an example of the second pattern. In FIG. 6, the high density portion 14 at the end portion, which is a portion forming the background 14 of the portion adjacent to the background 14 and the rectangular graphic 16, that is, the portion along the line Y-Y.
3, the inner intermediate density portion 142, the central low density portion 141, and the portion forming the rectangular graphic 16.
The details of the lines of the low-density portion 161 at the center and the high-density portion 162 at the end are illustrated.

The background 14 is composed of a plurality of lines 1401 to 1409 with a same mesh pitch P141, for example, a line number of 150 lines / inch, from a low density portion 141 at the center line CC to a high density portion 143 at the end. Has been formed. The color tones of these lines 1401 to 1409 are all the same light blue.
The rectangular figure 16 also has a low-density portion 161 at the center line CC.
From the end to the high density portion 162 at the end, the same mesh pitch P1
61, for example, 65 lines / inch and a plurality of halftone dots 16
01 to 1603. These lines 160
The colors 1-11603 are all light blue, which is the same as the lines 1401-1409. In other words, the lines 140 that make up the background 14
The mesh pitch P141 of 1 to 1409 is narrow, and the rectangular figure 1
Mesh pitch P1 of lines 1601 to 1603 forming 6
61 is wide, and the background 14 and the rectangular figure 1 have different mesh pitches.
6 and 6 are formed.

Lines 1401 to 1409 along both sides of the line Y-Y from the position of the center line C-C toward the end of the background 14.
Is thicker, and similarly, lines 1601 to 1603 are drawn from the center line CC position toward the end of the rectangular graphic 16.
Is thicker. Moreover, at the same position along both sides of the line Y-Y, the line widths of the lines forming the background 14 and the line lines forming the rectangular graphic 16 have a substantially equal area ratio in a certain unit area. , That is,
It is formed to match.

With the configuration of the lines described above, as is clear from the density curve CV14 of the background 14 and the density curve CV16 of the rectangular figure 16 shown in FIG. 5B, the density of the background 14 and the rectangular figure 16 is At the center line C-C position, there is almost no pattern, but the pattern is formed so that the density increases from the center line C-C toward the end. As a result, the edges visually appear dark blue and the center line C-
As it goes to C, it appears light blue, and the position of the center line C-C appears as the color of the printed matter itself, which is white in this example.
Moreover, since the background 14 and the rectangular figure 16 which are adjacent to each other are formed in synchronization with each other, the rectangular figure 16 existing in the background 14 seems to be hidden. The identification becomes difficult.

Lines 1401 to 1409 illustrated in FIG.
The lines 1601 to 1603 have thicknesses that cannot be identified by the resolution level L1 of the current latest high-performance color copying machine.
601-1602 are included. More preferably, it includes lines 1407 to 1409 having a thickness that can be sufficiently identified at the resolution level L3 of the lowest color copying machine. The resolution level L2 indicates a resolution level between the highest resolution level L1 and the lowest resolution level L3.

Also in the second embodiment, when copying is performed with a color copying machine having various resolutions, the same copying as in FIGS. 3A to 3C is obtained. Therefore, the pattern using such parallel lines effectively exhibits the copy restraint function as in the case of using halftone dots.

The first pattern and the second pattern are
It is not limited to the above. For example, rectangular figures 6, 16
You may use alphanumeric characters instead of. Further, the color is not limited to the above-described pink, light blue, etc., and any color can be used. Further, in the above-described example, the case where a color copying machine is used as the copying machine is illustrated, but when the copying check pattern of the present invention that is monotone printed 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.

Although the preferred embodiment has been described above as the printed matter having the copy restraint pattern of the present invention, the background 4 (or 14) and the rectangular figure 6 (or 16) are not necessarily in a synchronized state. Although there is an advantage that it is difficult to visually identify when synchronized, it is not necessary to be synchronized from the point of view of the copy restraint function, and the size of halftone dots or lines may be changed in an inclined or stepwise manner. It is sufficient if there is a change in concentration.

A printed matter according to the third embodiment of the present invention will be described. In the third embodiment, as shown in FIG. 7, the radial wavy line pattern is formed in combination with the constituent elements of the above-mentioned pattern. As the forming method, a camouflage pattern and a pattern are formed on the same plate and printed, or different plates are prepared for the camouflage pattern and the pattern, and the pattern is overprinted on the camouflage pattern, or There is a method of overprinting camouflage patterns on the pattern. In such a combination of a wavy line pattern and a pattern, the wavy line pattern is visually emphasized and visually recognized, and the pattern is hardly discernible. That is, in a normal state, the wavy line pattern is emphasized and visually recognized, and the wavy line pattern increases the camouflage effect. Therefore, whether or not the copy check pattern is a printed matter cannot be discriminated at all, and thus the copy check function is increased. . On the other hand, when such a printed matter is copied, as described above, in addition to the copy of the wavy line pattern, those patterns appear according to the printing state of the halftone dots or the lines. Functionality is still maintained.

As the camouflage pattern such as the wavy line pattern described above, various other patterns such as the wood grain pattern illustrated in FIG. 8 or the sand pattern can be applied. When the above-described pattern is printed on the printing paper on which the camouflage pattern is printed, the copy restraint effect is the same as the copy restraint function in the case of wood grain.

As the color of the wavy line pattern shown in FIG. 7 and the grain pattern shown in FIG. 8, in addition to the color clearly reproduced when copied, for example, dark yellow is printed, When visually inspected, the yellow color is considerably emphasized and the camouflage function for visual observation is maintained, but when copied, the yellow color has relatively low copy reproducibility. It is also possible to reveal the pattern clearly according to the pattern and set it in the same copying state as 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 example of the camouflage pattern, a camouflage pattern having a white grain pattern as shown in FIG. 9A is used, and the camouflage pattern and the characters shown in FIG. 9B are used. In combination with the copy restraint pattern in which the number of lines or the line width of the lines forming "COPY" decreases from the upper side to the lower side,
As shown in FIG. 9C, the copy restraint pattern may be partially exposed from the white portion of the camouflage pattern.

When a printed matter as shown in FIG. 9 (C) is copied, as shown in FIGS. 10 (A) and 10 (B), the printed state such as a halftone dot or a line is a component of the copy restraint pattern. In addition to copying the grain pattern, a copy restraint pattern (“COPY”) appears, so that the function as the copy restraint pattern is still maintained, and the grain check pattern makes it difficult to visually identify the copy restraint pattern. The camouflage effect is exhibited. It should be noted that FIG. 10 (A) is a duplicate of the printed matter shown in FIG. 9 (C) printed at high density, and FIG. 10 (B) is the printed matter shown in FIG. 9 (C) printed at low density. Is a duplicate of. FIG. 10 (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.

[0045]

As described above, according to the present invention, by changing the halftone dots or lines forming the copy restraint pattern, it is effective for copying means such as copying machines having various resolutions. A printed matter is provided which enables copy restraint. In particular, at least adjacent portions of two patterns having different mesh pitches are synchronized with each other so that the patterns of the original printed matter cannot be easily identified by visual observation.
When copied, the copy of the pattern having a large mesh pitch becomes more apparent, and the copied printed matter can be easily identified. Furthermore, when the above-described pattern is printed on a printing paper on which a camouflage pattern such as a wood grain pattern is printed as a base, the copy check function against visual observation is further enhanced.

[Brief description of drawings]

FIG. 1A is a plan view of a printed matter using halftone dots as a first embodiment of a printed matter having a copy restraint pattern of the present invention, and FIG. 1B is a graph showing its density distribution. Is.

FIG. 2 is a diagram showing details of halftone dots constituting a background and a figure 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.

FIG. 5 (A) is a plan view of a printed matter using lines as a second embodiment of the printed matter having the copy check pattern of the present invention, and FIG. 5 (B) is a graph showing its density distribution. Is.

FIG. 6 is a diagram showing details of lines forming a background and a figure of the printed matter shown in FIG.

FIG. 7 is a diagram showing a radial wavy line pattern as a first example of a camouflage pattern as a third embodiment of the present invention.

FIG. 8 is a diagram showing a grain pattern as a second example of the camouflage pattern as the third embodiment of the present invention.

FIG. 9A is a camouflage pattern with a white grain pattern, and FIG. 9B 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).

10A is a duplicate of the printed matter shown in FIG. 9C when printed at high density, and FIG. 10B is a duplicate when the printed matter shown in FIG. 9C is printed at low density. It is a thing.

[Explanation of symbols]

2, 12 ... Printed matter 4, 14 ... 41, 141..Low density area in the center of the background 42, 142 ··· Intermediate density portion inside the background 43, 143 ... High density areas at the edge of the background 401-409 ... 1401 to 1409 ... 6, 16 ... Rectangular figures 61, 161 .. Low density area in the center of rectangular figure 62, 162 ... High-density areas at the ends of rectangular figures 601-603 ... 1601-1603 ... Line

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B42D 1/10-15/10 B41M 3/14 G03G 21/00

Claims (6)

(57) [Claims] 1. At least two composed of halftone dots or lines.
One of which pattern is printed, the pattern Ri <br/> different number of lines of dot or line screen which constitutes the area ratio of the halftone dots or line screen in the pattern is a change in the inclined within the pattern Printed matter. 2. Constructing the at least two patterns
All the halftone dots or lines have the same color, and the at least two patterns have the same area ratio of halftone dots or lines in at least adjacent portions.
Printed matter described. 3. A changing halftone dot in the pattern or
The size or thickness of the line screen includes a size or thickness dimension which can not be copied by the copying machine, according to claim 1 or 2 prints according. 4. One of the at least two patterns has a halftone dot pitch greater than that of the other pattern.
Or, the background of the printed matter is constituted by halftone dots or lines having a small mesh pitch, and the background portion of the at least two patterns is constituted.
Larger dot pitch or mesh pitch than the pattern
The printed matter according to claim 3, wherein a latent image pattern such as characters and figures is formed by the halftone dots or lines . 5. One of the at least two patterns has a halftone dot pitch as compared with the other pattern.
The background of the printed matter is constituted by halftone dots or lines having a large mesh pitch, and the background portion of the at least two patterns is constituted.
Smaller dot pitch or mesh pitch than the pattern
The printed matter according to claim 3, wherein a latent image pattern such as characters and figures is formed by the halftone dots or lines . 6. The printed matter according to claim 1, which is formed by combining the pattern and a camouflage pattern for making it difficult to identify the pattern.