JPH08310107A - Method of producing copying preventive pattern and print thereof - Google Patents

Abstract

PURPOSE: To obtain a copying preventive pattern whose latent image appears when it is copied by a copying machine, by composing a line drawing in the part which is not given a latent image forming a curved collective pattern and a line drawing in the part which is given a latent image of fixed-cycle broken lines having a common image width in the direction perpendicular to a basic curve. CONSTITUTION: A border line 15 between a line drawing in the part which is not given a latent image and a line drawing in the part which is given a latent image crosses roughly perpendicuIarly a straight line 11 at an intersection 10 of a basic curve 8 and the outline 9 of the latent image. A boundary line 14 between an image area and a non-image area on a fixed-cycle broken line between the part which is not given a latent image and the part which is given a latent image is a straight line which intersects roughly perpendicularly a straight line 11 at an intersection 10' of the basic curve 8 and the boundary line 14 between the image area and the non-image area on the fixed-cycle broken line. The length of one cycle consisting of an image area and a non-image area which are continuous in the direction of the basic curves of respective fixed-cycle broken lines are made different from each other and the areas of the image areas corresponding to one cycle of respective fixed-cycle broken lines are made equal to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a latent image, which is usually invisible to the naked eye, to a curvilinear aggregate pattern, and develops a latent image in a printed matter requiring forgery and alteration prevention when copied by a copying machine. And a printed matter thereof.

[0002]

2. Description of the Related Art Counterfeiting and alteration prevention measures are important elements in printed matters such as securities such as banknotes, stock certificates, bonds, various certificates and important documents. Countermeasures against forgery and alteration of these printed materials mainly show a method that uses a design that uses a lot of geometric patterns in the design, and if some means and action are applied to the printed material, a latent image that cannot be visually recognized appears. There is such a method. Typical examples of the former are a tint block pattern, a color pattern, and a relief pattern, which are widely used in the design of printed matters such as securities. The latter representative example is a latent image intaglio, and colors are normally reproduced by a copying machine. There are functional inks and copy protection lines that are not protected. However, with the recent remarkable spread of color copying machines, there is a risk that crimes due to forgery and alteration will increase, and the development of technology as a more effective countermeasure against forgery and alteration has been desired.

Countermeasures against forgery and alteration using the above-mentioned geometric pattern include a tint block, a color pattern, and a relief pattern.
Basically, a pattern is composed of a set of curved strokes having a constant stroke width. These patterns can be counterfeited or counterfeited in consideration of design characteristics such as the design of printed matter, making it difficult to make the same pattern in a forged product by complicating the pattern, Its role as an anti-counterfeiting measure is enhanced by using a color that is difficult to reproduce by a plate-making device or by using a color that is difficult to reproduce in a copying machine, or by creating a complicated curved line to generate moire for scanning input / output of a copying machine and a scanner. . Further, the patterns are widely used worldwide in the design of printed matters such as securities, and at the same time, they have been used for a long time as printed matters having a monetary value such as banknotes, stocks, bonds, etc. It is an important design as a design that impresses a sense of luxury, and securities such as banknotes, stock certificates, bonds,
In printed matter such as various certificates and important documents, a tint block, a color pattern, a relief pattern and the like are patterns that are indispensable in terms of design. However, recently, with the advent of high-performance photoengraving equipment or copying machines, sufficient forgery,
It has the drawback that it does not provide the effect of preventing alteration.

Further, as a typical technique of displaying a latent image that cannot be visually recognized by applying some means and action to the above-mentioned printed matter, a copy-preventing image is generally used. There is a series of techniques called. That is, the latent image applied to the printed matter appears by copying with a copying machine. In a printed matter suitable for preventing forgery by such a copying machine, a latent image in which characters composed of fine dots, which are halftone dots of 85 lines and 30%, are displayed on the surface of a base paper is printed with silver ink, and then printed. Coarse or denser than the latent image (for example, 150 lines 30) in the blank area other than this latent image.
%) Printed with a halftone dot and a printed pattern such as a tint pattern or a tint pattern on the upper surface of the latent image, which is suitable for preventing forgery by copying (JP-A-57-20395). Also, a latent image is printed on the surface of the paper with halftone dots, a background of the same density as the latent image is printed simultaneously with a line, and a light color that is not reproduced by copying the decorative pattern on the upper surface of the latent image including the background. By overprinting with the transparent ink of, the surface of the printed matter is finished well and the pattern disappears when it is copied.
The background is reproduced and the latent image is not reproduced, and the density difference between the background and the latent image is apparent, and it can be seen at a glance that it is a copy, which is suitable for copy prevention (JP-A-60-7999).
No. 1), a latent image composed of halftone dots of 150 lines and 10%, and 50 to 60 on a white ground around the latent image.
Using a latent image plate with a background consisting of lines of about 10% lines, a dark pattern is printed on the surface of the paper and a waveform pattern of parallel lines that forms a moire pattern when it interferes with the lines of the background. By using an overprint plate equipped with, the light-colored overprint that is not reproduced by a copier on the surface of the paper, a moire pattern that is dazzling to the naked eye is formed on the surface of the printed matter, so the presence of a latent image can be identified. When the image is copied to a copying machine, the latent image and the waveform pattern are not reproduced, but only the background is reproduced. Therefore, the latent image can be recognized separately from the background.
-87380 gazette) etc. are disclosed.

In the printed matter according to the above-mentioned publications, a latent image is formed by the density of image lines (hereinafter referred to as a screen pattern) in which halftone dots or lines are continuously arranged at a constant cycle, and the printed matter of FIG. As shown in 1), the pattern (2) on the entire printing surface is a screen pattern having a uniform density. When the printed matter (1) provided with the latent image is copied by a copying machine, a densely constructed screen pattern (3) which is not reproduced and a coarsely constructed screen pattern (4) which is reproduced are shown in FIG. As shown in the pattern (2 ′) of (1 ′), a latent image of a screen pattern (3 ′) having a dense structure that is not reproduced, whereas a screen pattern (4 ′) having a coarse structure that is reproduced due to a difference in density is generated. The part is exposed so that it can be seen at a glance that it is a copy. However, since the entire print surface has a screen pattern with uniform density, the same print surface is visible to the naked eye. There is a drawback that the existence of a latent image can be discriminated by the different screen pattern above and by the interference part (5) with the boundary line of the latent image caused by the difference in screen shape and the screen pattern. It As a method for solving the above-mentioned drawbacks, all of the above-mentioned publications and the like provide different patterns, light-colored transparent ink, and light-color overprinting in order to camouflage the latent image, but the method is difficult to identify the latent image. However, it has the drawback of increasing the number of steps and not being economical.

Further, the inventors of the present invention set a background consisting of a latent image consisting of a pattern of halftone dots or lines on the surface of the paper and a background consisting of a pattern having a different density between the latent image and the latent image.
As a printed matter suitable for copy prevention (Japanese Unexamined Patent Publication No. 4-170569), in which a latent image pattern provided with the latent image is not discerned by the naked eye in a printed matter simultaneously printed with colors, the latent image is camouflaged. A different pattern, light-colored transparent ink, or a light-colored overprint, without a circular pattern, or with a concentric pattern that increases the dot percentage of a partial screen pattern to the entire screen pattern, etc. However, as described above, since the latent image is formed by the screen pattern in each of the above-mentioned conventional techniques, the latent image is easy to visually recognize. Since information such as written characters must play the role of camouflage, it can be used only for the background pattern of documents. , Or a single color print image line pattern itself subjected to the latent image on the free design of the pattern as Simon pattern, it is impossible to artistic prints with a decorative effect. Further, since the above-mentioned conventional methods are all required to have a screen pattern consisting of halftone dots or lines and other dense and dense patterns, securities such as banknotes, stock certificates, bonds, etc. that frequently use a tint block and a color pattern. There is a drawback that it is not suitable for use in existing products such as.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it can be applied to securities such as banknotes, stock certificates, bonds, etc., including various certificates and important documents requiring copy protection. By applying a latent image that is not normally visible to the naked eye to an applicable curvilinear aggregate pattern, overprinting for camouflage is not required, and a copy prevention pattern that has the effect of preventing forgery and alteration by a copying machine is created. The purpose is to provide a method and a printed matter thereof.

[0008]

The line drawing construction of the copy protection pattern of the present invention comprises a line drawing of a portion not forming a latent image forming a curved aggregate pattern and a line drawing of a portion forming a latent image, respectively. Each part is composed of a fixed period break line consisting of drawing lines of a predetermined shape arranged at regular intervals in the basic curve direction and having a common drawing line width in the direction perpendicular to the basic curve. The length of one cycle consisting of one imaged part and a non-imaged part continuous in the basic curve direction of the constant break line is different from each other, and corresponds to the one cycle of the constant break line of each part. The feature is that the drawing area ratios of the portions are equal to each other. In addition, the boundary line on the line drawing of the line drawing of the part where the latent image is not applied and the line drawing of the part where the latent image is applied is approximately perpendicular to the straight line tangent to the basic curve at the intersection of the basic curve and the contour line of the latent image. , And the boundary line between the non-image area and the non-image area on the fixed-cycle disconnection line of the part without the latent image and the part with the latent image on the basic curve and the fixed-cycle disconnection line. It is characterized in that it is a straight line that intersects at a substantially right angle with a straight line that is in contact with the basic curve at the intersection of the boundary between the imaged portion and the non-imaged portion.

[0009]

In a printed matter suitable for preventing forgery by a conventional copying machine, a latent image is formed by the density of screen patterns such as halftone dots or lines, and the entire printed surface has a screen pattern having a uniform density. On the other hand, in the line drawing configuration of the present invention, the line drawing of the portion not subjected to the latent image forming the curvilinear aggregate pattern and the line drawing of the portion subjected to the latent image are provided at constant intervals in the basic curve direction for each portion. In the direction of the basic curve of the fixed-cycle break line of each part, it is composed of fixed-cycle break lines that have a common drawing width in the direction perpendicular to the basic curve, which consists of the predetermined-shaped drawing lines arranged in The length of one cycle consisting of one continuous drawing part and non-drawing part is different from each other, and the drawing area ratios of the parts corresponding to the one cycle of the constant break line of each part are equal to each other. As copy protection pattern Constructed. That is, the line drawing of the portion not subjected to the latent image and the line drawing of the portion subjected to the latent image have the same drawing area ratio in the portions corresponding to the respective one cycles,
In addition, when observing the entire printed matter on which a line image with expansion values and the like is printed, the observer observes that the line image of the portion with the latent image and the line image of the portion without the latent image have different periodic shapes. Even though the line is a break line, the latent image is recognized as if it were a single continuous line in the direction of the basic curve, which makes it possible to make the latent image invisible to the naked eye. Further, when a printed matter having the line drawing structure of the present invention is copied by a copying machine, due to the resolving power of the copying machine, the periodic break line of the portion without the latent image is reproduced as it is, and the periodic break of the portion with the latent image is broken. Since the line is not reproduced or becomes defective in reproduction, when observing the copy with the naked eye, the line image of the part where the latent image is not applied is a continuous line in the direction of the basic curve, although it is a periodic break line. Although it is recognized as if it were a drawing line of a book, the line image of the part where the latent image is applied becomes unrecognizable, and a density difference occurs between the part where the latent image is not applied and the part where the latent image is applied. Express.

Further, the boundary line on the line drawing of the line drawing of the portion where the latent image is not applied and the line drawing of the line drawing of the portion where the latent image is applied is defined with respect to the straight line tangent to the basic curve at the intersection of the basic curve and the contour line of the latent image. , A straight line that intersects at a right angle, and at the same time, the boundary line between the non-imaged part and the imaged part on the fixed-cycle break line of the part without the latent image and the part with the latent image A straight line that intersects the basic curve at the intersection of the boundary line of the non-drawing part and the drawing line on the disconnection line is a straight line that intersects at a substantially right angle, according to the curved shape of the basic curve, each boundary You can give different angles to the lines. Therefore, the boundary line between the line drawing of the part without the latent image and the line drawing of the part with the latent image, and the image on the fixed-cycle disconnection line of each of the part without the latent image and the part with the latent image The boundary between the line part and the non-image line part is always changed by the curve shape of the copy protection pattern regardless of the outline of the latent image, and the line image of the part without the latent image and the line image of the part with the latent image The upper boundary line and the boundary line between the non-image area and the non-image area on the periodic break line of the non-latent image area and the non-latent image area are not necessarily in the same direction. It is possible to prevent interference between the contour line of the image and the line image of the copy protection pattern, and it effectively acts on the non-visibility of the latent image by the naked eye.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The line drawing structure of a copy protection pattern according to the present invention will be described with reference to the drawings. The copy protection pattern according to the line drawing configuration of the present invention is
Originally, as shown in FIG. 3, the line drawing is composed of a curved line drawing (6) of a portion without a latent image and a curved line drawing (7) of a portion with a latent image. In order to show the configuration in more detail, assuming that the curved line drawing is a straight line, description will be given with reference to FIG. FIG. 4 is an enlarged view of the boundary part on each line drawing, assuming that the line drawing of the part without the latent image and the line drawing of the part with the latent image are linearly continuous. Therefore, the basic curve (8) and the latent image in FIG. 5 showing the line drawing configuration of the portion without the latent image and the portion with the latent image when the copy protection pattern of the present invention is formed by the curved line image. Of the straight line (11) tangent to the basic curve (8) at the intersection (10) with the contour line (9), and the basic curve (8) and the latent image-free portion and the latent image-free portion, respectively. The straight line (11) tangent to the basic curve (8) at the intersection (10 ′) of the boundary line (14) between the imaged portion and the non-imaged portion on the fixed period break line is the basic curve (8) in FIG. ) Is the same.

First, in FIG. 4, an image in the direction perpendicular to the basic curve of the image portion of the constant period break line in the portion where the latent image is not applied and the image portion of the constant period break line in the portion where the latent image is applied are shown. The line width is A, the length in the basic curve direction of the image part of the fixed period break line where the latent image is not applied is B, and the basic curve direction of the non-image line part of the fixed period break line where the latent image is not applied Is the length of B ', the basic part of the drawing line of the fixed-cycle break line of the latent image is indicated by b, and the basic length of the non-drawing part of the fixed break of the latent image is shown. The length in the curve direction is b ', the length in the basic curve direction of one cycle consisting of one imaged part and non-imaged part in which a constant period break line of the part where the latent image is not applied is continuous, and the latent image is The length in the direction of the basic curve of one cycle consisting of one imaged part and a non-imaged part where the fixed-period disconnection line of the applied part is continuous is W ', and the expansion value generated around the imaged part when printed ( Well Is a contraction value) χ '. Here, in the case of printing a copy protection pattern according to the line drawing configuration of the present invention, in order to obtain the effects of the present invention as described above, a fixed period break line of a portion without a latent image and a portion of the latent image with a latent image are provided. Since the drawing area ratio of the fixed period break line is an important factor, consider the changes in the drawing width in the direction perpendicular to the basic curve and the drawing length in the basic curve in the drawing area during printing. It is preferable. On the printed matter, the length in the direction of the basic curve of the image portion (12) of the periodic break line in the portion where no latent image is applied is B
+ Χ '+ χ', and the length in the basic curve direction of the image portion (13) of the periodic break line of the latent imaged portion is b + χ '+
χ '. In order to obtain the action and effect of the present invention, when the printed matter having the line drawing structure of the present invention is copied by the copying machine, the fixed period break line of the portion not subjected to the latent image is reproduced as it is due to the resolving power of the copying machine. Therefore, it is necessary that the periodic break line of the portion on which the latent image is applied is not reproduced or reproduction failure occurs. Therefore, (B + χ '+ χ')>
At the same time as satisfying (b + χ '+ χ'), the periodic break line of the part without the latent image and the periodic break line of the part with the latent image appear to have the same density. The drawing area ratios of the portions corresponding to the one cycle of the constant period break line must be equal to each other. That is, in the line drawing configuration that achieves the effects of the present invention, at the stage of line drawing design, the length W in the basic curve direction of the one cycle of the fixed period break line of the portion where the latent image is not applied and the portion where the latent image is applied are determined. The length W ′ of the periodic break line in the direction of the basic curve of the one cycle is W: (B
+ Χ '+ χ') = W ': (b + χ' + χ ') must be satisfied.

Further, in the line drawing construction of the copy protection pattern of the present invention, a line drawing of a portion which does not form a latent image forming a curved aggregate pattern and a line drawing of a portion where a latent image is formed are basically provided for each part. Consists of fixed-cycle break lines that have a common drawing width in the direction perpendicular to the basic curve, and are composed of fixed-shape cut lines arranged at regular intervals in the curve direction. An image line of a part corresponding to the one period of the fixed-cycle break line of each part is different from each other in the length of one period consisting of one image line part and a non-image line part continuous in the basic curve direction of the line The area ratio is equal to each other. When the length in the basic curve direction of the non-image part of the periodic break line of the latent imaged part on the printed matter is b ′,
The b ′ shown in FIG. 4 may be set to 30 μm to 60 μm, which is a range in which the latent image is not visually recognized by the naked eye and is not resolved by the copying machine.

Further, in the conventionally disclosed copy-preventing printed matter, since the latent image is formed by the density of the screen pattern such as halftone dots or lines, the latent image of each image forming the copy-preventing pattern is hidden. The direction of the boundary line between the image line of the non-image part and the image line of the latent image is the same in the boundary part between the non-image part and the latent image part. However, since this causes interference, the latent image is visually perceived, which was one factor that forced us to use the camouflage pattern.
As shown in FIG. 5, the line drawing structure of the present invention is a method for enhancing the non-visibility of a latent image in a copy protection pattern. The boundary line (15) is a straight line that intersects the straight line (11) that is in contact with the basic curve (8) at the intersection (10) between the basic curve (8) and the contour line (9) of the latent image, at a right angle.
At the same time, the boundary line (1) between the imaged area and the non-imaged area on the periodic break line of the non-latent imaged portion and the latent imaged portion, respectively.
4) is a straight line (11) tangent to the basic curve (8) at the intersection (10 ') of the basic curve (8) and the boundary line (14) between the imaged portion and the non-imaged portion on the fixed period break line. On the other hand, it may be a straight line that intersects at a substantially right angle. By the way, Figure 6
When the boundary line (15) and the contour line (9) of the latent image are in the same direction and the boundary line (14) is in one direction regardless of the basic curve (8) as shown in FIG. Even when the line drawing design method of
5) has a regularity in the same direction as the latent image contour line (9) depending on the location, causing interference, and the boundary line (14) is oriented in the same direction depending on the location as the basic curve (8). It has regularity and causes interference. On the other hand, in the present invention, as shown in FIG. 5, the boundary line (15) is
Since the straight line (11) that is in contact with the basic curve (8) at the intersection of the basic curve (8) and the contour line (9) of the latent image can be made to intersect at a substantially right angle, the latent image is not applied. The boundary (15) of the periodic break line of the part and the periodic break line of the part on which the latent image is applied and the contour line (9) of the latent image can be made to have no regularity in the same direction. Therefore, when a copy protection pattern using the line drawing structure according to the present invention is printed, the image part (1) of the periodic break line of the part where the latent image is not applied is printed.
2), the image part of the periodic break line of the latent imaged part (1
3), between the contour line (9) of the latent image and the boundary line (14) between the imaged portion and the non-imaged portion on the fixed period break line of the non-latent imaged portion and the latent imaged portion, respectively. Interference can be prevented.

The embodiment of the present invention will be described in more detail.
Generally, a color pattern is a pattern drawn on a mathematical function according to a design, and therefore, as a device for creating the pattern, a device for drawing by a mechanical operation of a gear, a cam or the like, and a two-dimensional computer There is a device that draws by a function on coordinates, but in this embodiment, a commercially available computer
An example using a graphic design device (hereinafter referred to as CGS) will be described.

In the present invention, as described above, the expansion value (or contraction value) is preliminarily tested when the line drawing is designed at the time of plate making in consideration of the expansion value (or contraction value) of the drawing line. I investigated with a line. As a test image, a printed matter (16) as shown in FIG. 7 having a conventional color pattern pattern having an image width on the plate making film original plate of 100 μm was prepared. In this printed matter (16), commercially available coated paper (SK coat) is used as the paper, and the rheological suitability of the ink is
After performing offset printing with a commercially available offset ink (gray) having a viscosity of 99 poise and a tack value of 4.4, which is a general suitability, a color pattern (17) of the printed matter (16)
As a result of measuring the drawing width of the drawing line (18) of 116 μm, the expansion value of the drawing line in the drawing line width direction is 16 in total.
It was found that the expansion value (or contraction value) χ ′ generated around the image line when printing was 8 μm.

Using the value of the expansion value of 8 μm generated around the image line obtained by the test image line, the basic curve of the image part of the fixed period break line of the part where the latent image is not applied by the line image structure of the present invention. A printing plate was obtained to obtain a chromatic pattern printed matter FIG. First, a commercially available CGS is used to set a basic curve (8), which is a basic spline curve forming a color pattern as shown in FIG. 9, on two-dimensional coordinates, and a latent image pattern (19) is set.
Were arranged on a basic curve (8) consisting of a spline curve. It should be noted that the latent image pattern may be either characters or figures as long as it can be clearly identified by visual inspection when the printed matter of the present invention is reproduced by a copier by a discerning person. The boundary between the line drawing of the portion without the latent image and the line drawing of the portion with the latent image is a partial enlarged view of the basic curve (8) consisting of the spline curve in FIG. 9 and the contour line (9) of the latent image pattern. It is formed at an intersection (10) between the contour line (9) of the latent image pattern and the basic curve (8) in FIG.

First, in the copy-preventing color pattern to be created in the present embodiment, the print image in the direction perpendicular to the basic curve of the image portion of the periodic break line in the portion where the latent image is not applied in FIG. The line width is set to 116 μm and the line width A in line drawing design
Was set to 100 μm by subtracting the expansion value of 16 μm of the drawing line in the drawing line width direction grasped by the above-mentioned test drawing line. Next, in order to define the line drawing design of the portion on which the latent image is applied, that is, in order to define the length W ′ in the direction of the basic curve of one period of the fixed period break line of the portion on which the latent image is applied, the latent image is applied. Set the length b in the direction of the basic curve of the image part of the periodic break line of the shaded part and the length b'in the direction of the basic curve of the non-image part of the constant period break line of the latent imaged part. is necessary. First, regarding the length b + χ '+ χ' in the basic curve direction of the image part of the periodic break line on the printed matter, the latent image is not visible to the naked eye and is resolved by the copying machine. The output resolution of a general copying machine is 400d.
Since one pixel is 64 μm in terms of pi, 64 μm or less is suitable as a guide for the length that is difficult to be resolved, and in the present embodiment, the length b + χ ′ + χ ′ was set to 50 μm.
Therefore, b was set to 34 μm by subtracting the expansion value 16 μm of the drawing line in the direction of the basic curve grasped by the test drawing line. Next, the length b ′ in the basic curve direction of the non-image area of the periodic break line of the latent image is 30 μm which is a range in which the latent image is not visually recognized by the naked eye and is not resolved by the copying machine. ~ 60
Although it is possible to set the thickness to 50 μm, it is set to 50 μm in this embodiment. As a result, the length W'in the basic curve direction of one cycle of the constant-period break line of the latent imaged portion is 34 + 16 + 50 100 μm.
m, and the image area ratio is (b + χ '+ χ') / W '
50% of x100 was obtained. Further, when a printed matter having the line drawing structure of the present invention is copied by a copying machine, the constant power line of the portion not subjected to the latent image is reproduced as it is by the resolving power of the copying machine, and the constant frequency of the portion subjected to the latent image is fixed. Since it is necessary that the disconnection line is not reproduced or defective reproduction is required, (B + χ '+ χ')> (b + χ '+ χ') must be satisfied, and (B + χ '+ χ')> 50 is essential. It becomes a condition. Therefore, the length B in the basic direction of the image part of the fixed-period break line in the part where the latent image is not applied in the line drawing design.
Was 134 μm, and B + χ ′ + χ ′ was 134 + 8 + 8, 150 μm. Therefore, set b, W'and B
Is applied to the above formula, W: 150 = 100: 5
It becomes 0, and 300 μm is obtained as the length W in the direction of the basic curve of one cycle of the periodic break line of the part without the latent image, and the basic curve of the non-image part of the constant break line of the part without the latent image is obtained. A length B ′ in the direction of 150 μm was obtained.

Further, according to the numerical value obtained by the above-mentioned calculation formula, in the two-dimensional data as shown in FIG. 11, in the line drawing designing stage, the drawing part (12 ') of the fixed period break line of the part where the latent image is not applied is formed. Stroke width A perpendicular to the basic curve of 1
00 μm, the length B of the image area (12 ′) in the direction of the basic curve
Is 134 μm, the length W of the fixed-cycle disconnection line of the part without the latent image in the direction of the basic curve of the one cycle is 300 μm, and the base of the image part (13 ′) of the fixed-cycle disconnection line of the part with the latent image is The drawing line width A in the direction perpendicular to the curve is 100 μm, the length b of the drawing line part (13 ′) in the basic curve direction is 34 μm, and the basic of the one cycle of the constant break line of the latent imaged part Using a commercially available laser plotter to obtain a film original plate for plate making, using a commercially available laser plotter, a color pattern having a length W ′ in the curved direction of 100 μm,
A printing plate was prepared using a commercially available positive type PS plate. Next, using the obtained printing plate, on a commercially available coated paper (SK coat),
Rheological suitability of the ink is a commercially available offset ink (gray) with a viscosity of 99 poise and a tack value of 4.4. The adjustment of printing equipment is the same as general lithographic offset printing, and offset printing is performed without special adjustment. The printed matter of FIG. 8 was obtained.

When the printed matter of FIG. 8 is visually observed, it is apparent to the observer that the line drawing of the portion on which the latent image is formed and the line drawing of the portion on which the latent image is not formed are the periodic break lines having different shapes. Regardless, the latent image is recognized as if it were a single continuous line in the direction of the basic curve, which makes it possible to make the latent image indistinguishable by the naked eye. Therefore,
The observer cannot visually recognize the existence of the latent image-applied portion (20) unless he / she attempts to magnify the printed line image, and at first glance, the printed matter having the latent image-applied striated pattern (21) ( 22) looks like the same print as the print (16) with the conventional tint block pattern (17) of FIG. 7.

FIG. 12 shows a duplicate (23) obtained by duplicating FIG. 9 of the printed matter having the color pattern of the present invention by a color copying machine (Canon Color Laser Copier 470). The latent image portion (25) shown in FIG. 12, which is opposed to the latent image portion (20) shown in FIG. Since only the line mark ') becomes a line drawing that can be recognized, the state becomes a visible image (25), and it was obvious that it was a duplicate using a copying machine. This makes it possible to discriminate between true and false.

[0022]

As described above, according to the present invention, the latent image cannot be discerned by the naked eye, and when the image is copied by a copying machine, the portion provided with the latent image cannot be reproduced and the latent image is visualized. Therefore, it is possible to prevent forgery and alteration by a copying machine. Further, in the chromatic pattern of the present invention, since the latent image cannot be easily identified with the naked eye even in monochrome printing, it is not necessary to overprint the camouflage pattern, and the chromatic pattern can be used as a monochrome tint pattern. it can. As a result, the present invention provides a technique for preventing counterfeiting and alteration of securities such as banknotes, stock certificates, bonds, etc., and various certificates and important documents that must be prevented from forgery and alteration by a copying machine. It is valid.

[Brief description of drawings]

1 is a pattern of a conventional copy-preventing printed matter and a partially enlarged view of the pattern.

FIG. 2 is a pattern of a conventional copy-preventing printed matter and a partially enlarged view of the pattern.

FIG. 3 is a copy-enhanced pattern of the present invention and a partially enlarged view of the pattern.

FIG. 4 is an enlarged view of a boundary between a line drawing of a portion without a latent image and a line drawing of a portion with a latent image.

FIG. 5 is a diagram showing a line drawing configuration of a portion without a latent image and a portion with a latent image.

FIG. 6 shows a boundary line between a line drawing of a portion without a latent image and a line drawing of a portion with a latent image in the same direction as a contour line of the latent image, and Diagram showing the case where the boundary line between the drawing part and the non-drawing part on each periodic break line is unidirectional regardless of the basic curve

FIG. 7 is a conventional printed matter having a color pattern and an enlarged view of the pattern.

FIG. 8 is an enlarged view of a printed matter having a color pattern of the present invention and the pattern.

FIG. 9 is a diagram in which a basic curve and a latent image pattern that form a color pattern are set.

FIG. 10 is a partially enlarged view of a basic curve and a latent image pattern that form a color pattern.

FIG. 11 is a line drawing configuration diagram on the two-dimensional data of the color pattern of the present invention.

FIG. 12 is a partially enlarged view of a duplicate of a printed matter on which the colored pattern of the present invention is applied and the duplicated pattern.

[Explanation of symbols]

1 Conventional Copy Protection Printed Material 2 Pattern on Entire Printed Surface 3 Non-Reproduced Dense Structured Screen Pattern on Printed Material 3 ′ Non-Regenerated Densely Configured Screen Pattern 4 Regenerated Coarsely Configured Screen Pattern on Printed Material 4 '' Coarse-structured screen pattern reproduced on copy 5 Interference with boundary line of latent image 6 Line drawing of non-latent image portion 7 Line drawing of latent image portion 8 Basic curve 9 Contour line of latent image 10 Intersection point between basic curve and contour line of latent image 10 'Intersection point between boundary line of imaged part and non-imaged part on fixed period disconnection line and basic curve 11 Straight line tangent to basic curve 12 Image part of constant period break line 12 'Image part of constant period break line of the part not to apply latent image 13 Image part of constant period break line of part to which latent image is applied 13' of part of latent image Apply a latent image 14 of the periodic break line Boundary line between the non-imaged part and the imaged part on the periodic break lines of the non-imaged part and the latent imaged part 15 Printed matter having a conventional color pattern 17 Conventional color pattern 18 Image line of a conventional color pattern 19 Latent image pattern 20 Latent image-applied portion 20 'Latent image-applied line drawing 21 Latent image is provided Chromatic pattern 21 'Line drawing of a part without a latent image 22 Printed matter having a colored pattern with a latent image 23 Reproduction 24 Duplicate color pattern 24' Line drawing of a duplicated pattern 25 Visual image A Latent Image width in the direction perpendicular to the basic curve of the image part of the periodic break line of the part where the image is not applied and the image part of the image of the periodic break line of the part where the latent image is applied B of the part where the latent image is not applied The length in the direction of the basic curve of the image part of the periodic break line B'of the periodic break line of the part where the latent image is not applied The length of the non-image area in the direction of the basic curve b The length of the periodic break line in the area where the latent image is applied The length of the image area in the direction of the basic curve b'The non-image of the periodic break line in the area where the latent image is applied Length of the line part in the direction of the basic curve W Basic length of one cycle of the constant period break line of the part without the latent image W'Length of the part of the constant curve of the part with the latent image line Basic curve of the break line Length of direction χ'Expansion value (or contraction value) that occurs around the drawing line

Claims (12)

[Claims] 1. A line drawing of a portion not formed with a latent image forming a curved aggregate pattern and a line drawing of a portion formed with a latent image are arranged at a predetermined interval in the basic curve direction for each portion. Consist of fixed-cycle break lines that have a common drawing width in the direction perpendicular to the basic curve, and are continuous in the basic curve direction of the fixed-cycle break lines of each part. It is characterized in that the lengths of one cycle composed of the line portion and the non-drawing portion are different from each other, and the drawing area ratios of the portions corresponding to the one cycle of the fixed period break lines of the respective portions are equal to each other. How to create a copy protection pattern. 2. A line drawing of a portion on which a latent image is not formed and a line drawing of a portion on which a latent image is formed, which forms a curved aggregate pattern, are arranged in the basic curve direction at predetermined intervals for each portion. Consist of fixed-cycle break lines that have a common drawing width in the direction perpendicular to the basic curve, and are continuous in the basic curve direction of the fixed-cycle break lines of each part. It is characterized in that the lengths of one cycle composed of the line portion and the non-drawing portion are different from each other, and the drawing area ratios of the portions corresponding to the one cycle of the fixed period break lines of the respective portions are equal to each other. A printed matter having a copy protection pattern. 3. A straight line which is tangent to the basic curve at the intersection of the basic curve and the contour line of the latent image, the boundary line on the line drawing of the line drawing of the portion not having the latent image and the line drawing of the portion having the latent image. , A straight line that intersects at a substantially right angle, and at the same time, the boundary line between the non-image area and the non-image area on the line with the constant period of the non-latent image and the latent image 2. The copy protection pattern according to claim 1, wherein the line is a line that intersects with a straight line that is in contact with the basic curve at an intersection of the boundary between the imaged portion on the break line and the non-imaged portion. How to make. 4. A straight line which is tangent to the basic curve at the intersection of the basic curve and the contour line of the latent image, in which the boundary line on the line drawing of the line drawing of the part where the latent image is not applied and the line drawing of the part where the latent image is applied , A straight line that intersects at a substantially right angle, and at the same time, the boundary line between the non-image area and the non-image area on the line with the constant period of the non-latent image and the latent image 3. The copy protection pattern latent image according to claim 2, wherein the line is a line that intersects with a straight line that is in contact with the basic curve at a point of intersection between the drawing line portion on the disconnection line and the boundary line of the non-printing line portion, and that is a substantially right angle. Printed material with an image. 5. The method of creating a copy protection pattern according to claim 1, wherein the curved aggregate pattern is a tint block pattern or a color pattern pattern. 6. The printed matter having a copy protection pattern according to claim 2, wherein the curved aggregate pattern is a tint block pattern or a color pattern pattern. 7. The method of creating a copy protection pattern according to claim 3, wherein the curved aggregate pattern is a tint block pattern or a color pattern pattern. 8. The printed matter having a copy protection pattern according to claim 4, wherein the curved aggregate pattern is a tint block pattern or a color pattern pattern. 9. The method according to claim 1, wherein the curved aggregate pattern is a relief pattern. 10. The printed matter having a copy-preventing pattern according to claim 2, wherein the curved aggregate pattern is a relief pattern. 11. The method according to claim 3, wherein the curved aggregate pattern is a relief pattern. 12. The printed matter having a copy-preventing pattern according to claim 4, wherein the curved aggregate pattern is a relief pattern.