JPH11286162A - Printed matter with anti-copying effect and its manufacturing method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] A technique for preventing forgery of a valuable printed matter such as a certificate or securities by a copying machine. SOLUTION: When forming a latent image pattern for copy prevention on a printed matter, instead of using the size of a halftone dot, a crossing portion of a straight line is liable to be enlarged and enlarged by copying, and the density of a copying machine is reproduced in a high density. This is based on characteristics. The boundary between the latent image portion (pattern having no straight line intersection) and the background portion (pattern having no straight line intersection) cannot be apparently recognized, and the latent image is completely formed. However, when the image is copied, the latent image clearly appears.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for preventing forgery of valuable printed matter such as certificates and securities by a copying machine.

[0002]

2. Description of the Related Art Conventionally, latent image patterns used in this type of copy-prevention printed matter are all small or large in halftone dots.
Latent images are formed due to the difference in the thickness of the image lines such as lines, and these are recognized as printed matter having a uniform density when the pattern is formed on the entire printing surface. When a printed material having such a latent image is copied by a copying machine, a density difference occurs between a small halftone dot that is not reproduced and a small halftone dot that is reproduced, and a latent image appears. However, the printed matter produced by such a principle has a drawback that the boundary between the latent image portion and the background portion other than the latent image can be easily recognized at the time of visual observation, and the latent image can be seen even in the initial printed matter state. Was.

[0003]

Generally, as a principle of a copying machine, an image is formed by projecting light on an object to be copied and detecting reflected light thereof. However, at the intersection where the objects on the copy are densely arranged, the light emission of the copying machine becomes too large, but it is difficult to adjust the light emission of the copying machine at the intersection of the objects. As a result, light crosses over the object intersections of the printed matter, and the image enlargement or the intersections tend to be easily deformed.

According to the present invention, when a latent image pattern (hidden image) for copy prevention is formed on a printed material, the intersection of a straight line is liable to be greatly enlarged by copying instead of utilizing the size of a halftone dot.
This is based on the characteristic of a copying machine that the density is reproduced at a high density.In the printed matter produced by the method of the present invention, the boundary between the latent image portion and the background portion other than the latent image cannot be recognized visually, and the latent image is completely hidden. The purpose of this method is to produce a printed material having an effect of preventing forgery in which a warning character or the like appears at the time of copying in order to clearly form a latent image depending on copying.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a copy-preventing printed matter having a latent image formed by an image configuration of a first pattern and a second pattern. In the first pattern, the unit rectangular object (I)
And a straight line group (1, 2, 3) and a straight line group (3 ′) that intersect with the unit rectangular object within the unit rectangular object, and the second pattern has the same size as the first pattern. It is composed of a unit rectangular object (I ') and straight lines (4, 5) that do not intersect with the unit rectangular object in the unit rectangular object. The line area is set equal to the image area of the straight line group in the unit rectangular image of the second pattern so that the straight lines in the unit rectangle of the first pattern and the second pattern have the same angle and the same direction. It is a printed pattern characterized by having done.

In a copy-prevention printed matter having a latent image formed of the first pattern and the second pattern image structure, the first pattern includes a unit rectangular image (I) and a unit rectangular image. Group of straight lines (1,
2, 3) and a group of straight lines that do not intersect (3 ').
The pattern is composed of a unit rectangular image (I ") having the same size as the first pattern and a double line (6, 6) that does not intersect within the unit rectangular image.
7, 8, 9) or a group of straight lines of multiple lines.
The image area of the straight line group in the unit rectangular image of the pattern,
The image area of the straight line group in the unit rectangular object of the pattern is made equal, and the straight lines in the unit rectangle of the first pattern and the second pattern are configured to have the same angle and the same direction. It is a printed pattern.

Further, in a copy-preventing printed matter having a latent image formed of the first pattern and the image pattern of the second pattern, the first pattern is smaller than the unit rectangular area and the unit rectangular area. Straight line group (10,1
1), and the second pattern is smaller than the range of the unit rectangle, and within the unit rectangle range, the double line (12, 12 ′, 13,...) Of the straight line group (10, 11) of the first pattern.
13 ′, 14, 14 ′, 15, 15 ′) or a group of straight lines of multiple lines, and furthermore, the image area of the straight line group within the unit rectangular range of the first pattern, and the line area within the unit rectangular range of the second pattern. Is a printed pattern characterized in that the image areas of the straight line groups are equal, and the straight line groups of the respective patterns are discontinuous with each other.

Further, in order to solve the above-mentioned problem, the invention of this method is directed to a copy-prevention printed matter having a latent image formed by the image configuration of the first pattern and the second pattern. The pattern includes a unit rectangular object (I) and a group of straight lines (1, 2, 2,
3) and a group of straight lines (3 ′) that do not intersect. The second pattern has a unit rectangular object (I ′) having the same size as the first pattern and an intersecting unit rectangular object within the unit rectangular object. And a straight line group (4, 5) which does not have the same image area as the straight line group in the unit rectangular image of the first pattern and the straight line group in the unit rectangular image of the second pattern. And a straight line group in the unit rectangle of the first pattern and the second pattern having the same angle and the same direction.

In a copy-prevention printed matter having a latent image formed by the first pattern and the second pattern image configuration, the first pattern includes a unit rectangular image (I) and a unit rectangular image. Group of straight lines (1,
2, 3) and a group of straight lines that do not intersect (3 ').
The pattern is composed of a unit rectangular image (I ") having the same size as the first pattern and a double line (6, 6) that does not intersect within the unit rectangular image.
7, 8, 9) or a group of straight lines of multiple lines.
The image area of the straight line group in the unit rectangular image of the pattern,
The image area of the straight line group in the unit rectangular object of the pattern is made equal, and the straight lines in the unit rectangle of the first pattern and the second pattern are configured to have the same angle and the same direction. This is a method for producing a printed pattern.

In a copy-preventing printed matter provided with a latent image formed of the first pattern and the second pattern image, the first pattern is smaller than the unit rectangular area and is smaller than the unit rectangular area. Straight line group (10,1
1), and the second pattern is smaller than the range of the unit rectangle, and within the unit rectangle range, the double line (12, 12 ′, 13,...) Of the straight line group (10, 11) of the first pattern.
13 ′, 14, 14 ′, 15, 15 ′) or a group of straight lines of multiple lines, and furthermore, the image area of the straight line group within the unit rectangular range of the first pattern, and the line area within the unit rectangular range of the second pattern. Is a method of producing a printed pattern, characterized in that the image areas of the straight line groups are equal and the straight line groups of each pattern are discontinuous with each other.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a printed matter having a copy preventing effect according to the present invention and a method for producing the same will be described.
Embodiment 1 In the first pattern of FIG. 1, I is a unit rectangular object, and 1, 2, 3, and 3 ′ are a group of straight lines in the unit rectangular object I. At this time, 1, 2, 3, and 3 'are diagonal lines. Among them, diagonal lines 3 and 3' change their angles at certain points and exist on the extension of the diagonal line 1 or diagonal line 2.
A is the image area of the oblique line 1, d is the image area of the oblique line 2,
b and c are the image areas of the oblique lines 3 and 3 '. Further, the oblique lines 1 and 2 are straight lines which have directionality and are in contact with one side or one corner of the unit rectangular image I, and are oblique lines 3 and 3 '.
Has two directions, and the oblique line 3 is 1 of the unit rectangular image I.
The oblique line 3 ′ is a straight line that does not touch the unit rectangular image I.

In the second pattern of FIG. 2, I 'is a unit rectangular image, 4 is a diagonal line having the same angle as the diagonal line 1 in FIG. 1, 5 is a diagonal line having the same angle as the diagonal line 2 in FIG. The image I 'is a straight line that does not touch. Further, e is the image area of the oblique line 4, and f is the image area of the oblique line 5. At this time, assuming that the total image area in the straight line group in FIG. 1 is A, A = 2a +
2b + 2c + 2d. If the total image area in the straight line group in FIG. 2 is A ′, then A ′ = 2e + 2f, and the total image area in the straight line group is A = A ′, the unit rectangular object I and the unit rectangle The sum of the image areas in the straight line group within the image I 'becomes equal.

With such an image configuration of the first and second patterns, a small size which is difficult to be recognized by the naked eye,
Furthermore, as shown in FIG. 3, the object configuration in the unit rectangular objects (I, I ′) of the first pattern and the second pattern is arranged at the same angle and in the same direction, so that the object shape is changed. Even if different, it looks easy to look the same shape (W portion in FIG. 4). When the object configurations of these two patterns are arranged and printed in, for example, a character shape L (a portion indicated by a phantom line in FIG. 4), that is, in a shape of, for example, English character “C”, as shown in FIG. The printed pattern D can be printed on the surface of, and the apparent print density is the same, so that the latent image cannot be confirmed.

As shown in FIG. 5, a copy obtained by copying the printed matter of the paper P is C, T is the area printed and copied in the second pattern, and S is the first area. This area is printed and copied in a pattern. At this time, the intersections of the oblique lines 1, 2, and 3 in contact with one side or one corner of the unit rectangular object I, which is the object configuration of the first pattern shown in FIG. The amount of light is too large, and the image is thickened and the image is deformed due to light fogging.

As a result, the area S printed and copied with the image configuration of the first pattern of the copy C of FIG. 5 with respect to the print pattern D of FIG. 4 is expressed with high density. On the other hand, the oblique line 4 and the oblique line 5 in FIG. 2 are reproduced as they are in the area T printed and copied with the image configuration of the second pattern of the copy C. For this reason, in the first and second patterns, a density difference occurs as shown in FIG. 5, and the meaningful image of the English character “C” can be easily recognized as a latent image.

[Embodiment 2] The first pattern of Embodiment 2 is as follows.
This is the same as FIG. 1 described above. In FIG. 6, which is the second putter, I ″ is a unit rectangular image, oblique lines 6 and 7 are oblique lines having the same angle as oblique line 1 in FIG. 1, and oblique lines 8 and 9 are oblique lines having the same angle as oblique line 2 in FIG. It is an oblique line and is a straight line that does not touch the unit rectangular image line I ". The image width of the oblique line 6 and the oblique line 7 is configured to be half the image width of the oblique line 4 in FIG. 2, and the image width of the oblique line 8 and the oblique line 9 is one of the oblique line 5 in FIG. / 2 image width. At this time, g is the image area of the oblique line 6, h is the image area of the oblique line 7, i is the image area of the oblique line 9, and j is the oblique line 8.
, And k is the distance between the oblique lines 6 and 7 and between the oblique lines 8 and 9.

If the total image area of the straight line group in the first pattern is A, then A = 2a + 2b + 2c + 2d (see FIG. 1 and description above). Assuming that the total image area in the straight line group in FIG. 6 is B, B = 2g + 2h + 2
i + 2j, and the total image area of the straight line group at this time is A = B, and the total image area of the straight line groups within the unit rectangular image I and the unit rectangular image I "is equal.

With such an image configuration of the first and second patterns, the size of the image in the unit rectangular image of the first and second patterns is very small, so that it is difficult to recognize the image with normal eyes. By arranging the line configuration at the same angle and in the same direction as in FIG. 3, even if the object shapes are different, it is easy to see the same shape in appearance. When these two types of object configurations are arranged and printed in, for example, a character shape L ′ (a portion indicated by a phantom line in FIG. 7), that is, for example, in a shape of an English character “C”, as shown in FIG. Since the printed pattern D 'can be printed on the surface and the apparent print density is the same, the latent image cannot be confirmed.

As shown in FIG. 8, a copy obtained by copying the printed matter of the paper P ′ is C ′, X is an area printed and copied in the second pattern, and S ′ is the area shown in FIG. This is the area printed and copied with the image configuration of the first pattern. At this time, the intersections of the oblique lines 1, 2, and 3 in contact with one side or one corner of the unit rectangular image I, which is the object configuration of the first pattern in FIG. Is too large, and the fogging of light causes thickening of the object and deformation of the object.

On the other hand, printing is performed with the object configuration of the second pattern,
In the copied area X, when the image widths of the oblique lines 6, 7, 7, 8 and 9 in FIG. 6 and the distance k between the oblique lines 6 and 7 and the oblique lines 8 and 9 in FIG. Therefore, in a general copying machine, it is difficult to reproduce a minute image from a relationship of resolution, and as a result, the image is expressed with a low density. For this reason, a large density difference occurs between the first and second patterns, and the meaningful image of the English character “C” can be more effectively and easily recognized as a latent image. (The difference in density between the copies shown in FIGS. 5 and 8 is apparent.)

[Embodiment 3] FIG. 9 shows an image configuration of a first pattern according to an embodiment of the present invention, which is constituted by a straight line intersecting a straight line 10 and a straight line 11 within a range II in a unit rectangle. Is the image area of the straight line 11, and m is the image area of the straight line 10. In the second pattern of FIG. 10, the intermittent straight lines 12, 12 ', 13, 13' are straight lines having the same angle as the straight line 10 within the range of the unit rectangle II ', and the intermittent straight lines 14, 1
4 ′, 15, 15 ′ are straight lines having the same angle as the straight line 11. Further, p and n are configured with half the image width of the straight line 11 in FIG. 9, o and q are configured with half the image width of the straight line 10 in FIG. Straight line 12, 12 ', 1
The intervals are 3, 13 ', 14, 14', 15, 15 '.

Assuming that the total image area of the straight line group in the first pattern of FIG. 9 is E, E = u + m. If the total image area of the straight line group in the second pattern of FIG. '= N + o + p + q. Further, the total image area of the straight line group is E = E ′, and the total image area of the straight line group in the unit rectangle II and the unit rectangle II ′ is equal. At this time, the straight lines 10 and 11 in the unit rectangle II and the intermittent straight lines 12, 12 ', 13, and
13 ', 14, 14', 15, 15 'are set at an arbitrary position and an arbitrary length, and are arranged so as not to touch the boundary of the unit rectangle. That is, the straight line group in each pattern is in a discontinuous state. Also, of course, no straight line exists at the boundary between the adjacent unit rectangle II and the adjacent unit rectangle II ′.

The first and second pattern object configurations have such a small size that it is usually difficult to recognize them visually, and further, the first pattern object configuration and the second pattern unit. By forming the object configuration within the rectangular object at the same angle, even if the object shape is different, it is easy to see the same shape in appearance. When these two types of object configurations are arranged and printed in, for example, a character shape L "(a portion indicated by a phantom line in FIG. 11), that is, in the shape of, for example, an English character" C ",
Since the print pattern D "can be printed on the surface of the paper P" and the print density is apparently the same, the latent image cannot be confirmed. FIG.
As shown in the figure, a copy of the printed matter of the sheet P "is C".
Where Y is an area printed and copied in the second pattern object configuration, and Z is an area printed and copied in the first pattern object configuration. At this time, the intersection of the straight line 10 and the straight line 11, which is the object configuration of the first pattern shown in FIG. This causes line deformation.

On the other hand, the area Y printed and copied with the object configuration of the second pattern in FIG.
When the image width and the image interval r are 2, 12 ', 13, 13', 14, 14 ', 15, and 15', each straight line has a very small size. In this case, it is difficult to reproduce a minute image from the relationship of resolution, and the image is expressed with a relatively low density. For this reason, the density is high in the image configuration of the first pattern, and the density is low in the image configuration of the second pattern, so that a large density difference occurs. That is, after copying, the meaningful image of the English character "C" can be easily recognized as a latent image. Further, in the printing of the image configuration of the first and second patterns, it is possible to print a copy-forgery-inhibited pattern or the like with a low print density. This is particularly effective when used as a method for preventing the copying of valuable printed matter such as certificates and securities, since it can be read visually easily.

[0025]

In the first embodiment using the unit rectangular object,
When the image configuration of the first pattern is configured as a meaningful image and the image configuration of the second pattern is configured as a background, the two image configurations are equal in density, so that only a uniform background can be recognized as a printed matter. However, when a copy is made by a copying machine, a density difference occurs at the intersection of the image configuration of the first pattern due to the image thickness. As a result, a meaningful image appears with respect to the background, and it becomes visually clear that the image is a duplicate.

In the second embodiment using a unit rectangular object, when the object structure of the first pattern is configured as a meaningful image and the object configuration of the second pattern is set as a background, the two pattern object configurations are equal. Because of the density, the printed matter can be recognized only as a uniform background. However, when the image is copied by a copying machine, the intersection of the object configuration of the first pattern becomes thicker, and the object configuration of the second pattern becomes thinner. As a result, a meaningful image appears with respect to the background, and the image becomes clearer and clearer.

In the third embodiment which does not use a unit rectangular object,
When the object configuration of the first pattern is configured as a meaningful image and the object configuration of the second pattern is configured as a background, the first pattern and the first
There is no unit rectangular object at the boundary of the object configuration of the pattern, the second pattern and the second pattern, and the adjacent pattern of the first pattern and the second pattern, and the first pattern, the first pattern, and the 2 patterns, 2nd pattern and 1st pattern
Around the boundary of the unit rectangle of the pattern and the second pattern,
Since the straight lines in the unit rectangle are not continuous and the number of image lines in the unit rectangle is relatively small as compared with the first and second embodiments,
Since the print density is low and the same, the printed matter can be recognized only as a uniform background. However, when copied by a copying machine, the image configuration of the first pattern has a thicker image at the intersection, and the image configuration of the second pattern has a thinner image. As a result, after copying,
The meaningful image appears on the background, and the latent image effect is largely and clearly expressed.

[Brief description of the drawings]

FIG. 1 is a diagram of a first pattern composed of a unit rectangular image line and a straight line group having an intersection.

FIG. 2 is a diagram of a second pattern composed of a unit rectangular object and a straight line group having no intersection.

FIG. 3 is an enlarged view of a portion W in FIG. 4;

FIG. 4 is a diagram of a printed matter having the image configuration of the first pattern in FIG. 1 and the image configuration of the second pattern in FIG. 2;

FIG. 5 is a view of the copy of FIG. 3;

FIG. 6 is a diagram of a second pattern composed of a unit rectangular object and a straight line group having no intersection.

7 is a diagram of a printed matter having the image configuration of the first pattern in FIG. 1 and the image configuration of the second pattern in FIG. 6;

FIG. 8 is a view of a copy of FIG. 7;

FIG. 9 is a diagram of a first pattern formed by a group of straight lines intersecting in a unit rectangle.

FIG. 10 is a diagram of a second pattern constituted by a group of straight lines intermittent in a unit rectangle.

11 is a diagram of a printed matter having the image configuration of the first pattern in FIG. 9 and the image configuration of the second pattern in FIG. 10;

FIG. 12 is a copy of FIG.

[Explanation of Signs] I, I ', I "unit rectangular image II, II' unit rectangle P, P ', P" paper D, D', D "print pattern C, C ', C" copy L, L ', L "Character shape S, S' Region where latent image appears with high density after copying T Region where reproduced and reproduced as it is W Enlarged portion of printed matter X Region with low density after copying Y Copy Area where the density is reduced and Z is copied and the density is increased and the latent image appears

Claims (6)

[Claims] 1. A copy prevention printed matter having a latent image formed by a first pattern and a second pattern image configuration, wherein the first pattern includes a unit rectangular image (I) and a unit rectangular image. In the line, a group of straight lines (1, 2, 2,
3) and a group of straight lines (3 ′) that do not intersect. The second pattern has a unit rectangular object (I ′) having the same size as the first pattern and an intersecting unit rectangular object within the unit rectangular object. And a straight line group (4, 5) which does not have the same image area as the straight line group in the unit rectangular image of the first pattern and the straight line group in the unit rectangular image of the second pattern. And a straight pattern group in the unit rectangle of the first pattern and the second pattern having the same angle and the same direction. 2. A printed matter for copy prevention having a latent image formed by a first pattern and an image configuration of a second pattern, wherein the first pattern includes a unit rectangular object (I) and a unit rectangular object. Group of straight lines (1, 2, 2,
3) and a group of straight lines (3 ′) that do not intersect. The second pattern has a unit rectangular image (I ″) having the same size as the first pattern and a double line (“I”) that does not intersect within the unit rectangular image. 6,
7, 8, 9) or a group of straight lines of multiple lines.
The image area of the straight line group in the unit rectangular image of the pattern,
The image area of the straight line group in the unit rectangular object of the pattern is made equal, and the straight lines in the unit rectangle of the first pattern and the second pattern are configured to have the same angle and the same direction. Print pattern. 3. In a printed matter for copy prevention having a latent image formed by an image configuration of a first pattern and a second pattern, the first pattern is smaller than a unit rectangular area and a unit rectangular area. Straight line group (10,1
1), and the second pattern is smaller than the range of the unit rectangle, and within the unit rectangle range, the double line (12, 12 ′, 13,...) Of the straight line group (10, 11) of the first pattern.
13 ′, 14, 14 ′, 15, 15 ′) or a group of straight lines of multiple lines, and furthermore, the image area of the straight line group within the unit rectangular range of the first pattern, and the line area within the unit rectangular range of the second pattern. Wherein the image areas of the straight line groups are equal, and the straight line groups of each pattern are configured to be discontinuous with each other. 4. In a printed matter for copy prevention provided with a latent image formed by a first pattern and an image configuration of a second pattern, the first pattern includes a unit rectangular image (I) and a unit rectangular image. In the line, a group of straight lines (1, 2, 2,
3) and a group of straight lines (3 ′) that do not intersect. The second pattern has a unit rectangular object (I ′) having the same size as the first pattern and an intersecting unit rectangular object within the unit rectangular object. And a straight line group (4, 5) which does not have the same image area as the straight line group in the unit rectangular image of the first pattern and the straight line group in the unit rectangular image of the second pattern. A method for producing a printed pattern, wherein the straight lines in the unit rectangle of the first pattern and the second pattern have the same angle and the same direction. 5. In a copy-prevention printed matter provided with a latent image formed of the first pattern and the second pattern image configuration, the first pattern includes a unit rectangular image (I) and a unit rectangular image. Group of straight lines (1, 2, 2,
3) and a group of straight lines (3 ′) that do not intersect. The second pattern has a unit rectangular image (I ″) having the same size as the first pattern and a double line (“I”) that does not intersect within the unit rectangular image. 6,
7, 8, 9) or a group of straight lines of multiple lines.
The image area of the straight line group in the unit rectangular image of the pattern,
The image area of the straight line group in the unit rectangular object of the pattern is made equal, and the straight lines in the unit rectangle of the first pattern and the second pattern are configured to have the same angle and the same direction. How to make a printed pattern. 6. A copy protection printed matter having a latent image formed of the first pattern and the second pattern image configuration, wherein the first pattern is smaller than a unit rectangular area and a unit rectangular area. Straight line group (10,1
1), and the second pattern is smaller than the range of the unit rectangle, and within the unit rectangle range, the double line (12, 12 ′, 13,...) Of the straight line group (10, 11) of the first pattern.
13 ′, 14, 14 ′, 15, 15 ′) or a group of straight lines of multiple lines, and furthermore, the image area of the straight line group within the unit rectangular range of the first pattern, and the line area within the unit rectangular range of the second pattern. Wherein the image areas of the straight line groups are equal, and the straight line groups of each pattern are configured to be discontinuous with each other.