JP3509928B2 - Printed copy to prevent forgery - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various printed matters which are prevented from forgery due to copying, and for example, prevent forgery by color copying printed matters such as banknotes, checks, gift certificates, and various securities. For printed matter.

[0002]

2. Description of the Related Art As the accuracy of color copying machines has improved in recent years, there has been a situation in which banknotes, checks, gift certificates, various securities, etc. are copied and forged. To prevent counterfeiting by copying, use special ink, imprint magnetic mark,
Attempts have been made to print hidden letters by using fluorescent substances, but there were problems in terms of lack of sustainability, the need for special equipment, and high costs.

In order to solve these problems, a latent image composed of fine constituents has already been printed on the surface of a substrate, which has been already disclosed in Japanese Patent Publication No. 55-45400, and a latent image is formed on a white background around the latent image. A latent image-containing printed matter that is printed using a finer component that is coarser or denser than the image, and Japanese Patent Publication No. 58-477.
No. 08, a color composite image having a camouflage tone image printed with a first tone image and a second tone image, a color copier for one of the first tone image and the second tone image. The density that can be reproduced by, for example, the number of screen lines (the number of lines or points per unit length of the screen) is 65 lines per inch (2.54 cm), and the density that cannot be reproduced by the other, for example, the number of screen lines is 1 Inch (2.
One of the first tone image and the second tone image cannot be distinguished from the other when formed with 130 lines per 54 cm) and observed with the naked eye, but one tone image is clear when copied by a copying machine. Of the document in which the warning mark is formed, or the dark pattern pattern of 150 is disclosed on the surface of the base paper disclosed in Japanese Patent Laid-Open No. 2-81698.
To 175 lines, 10% halftone dots, background patterns other than this pattern are printed in shades that can be clearly discriminated from the pattern pattern, and 150 to 175 lines and 10% halftone dots are printed, respectively. There has been proposed a copy forgery prevention sheet imprinted with a wording indicating that this pattern is provided on the copy. Furthermore, as a modification of the document in Japanese Examined Patent Publication No. 58-47708, Jpn.
There has also been proposed a copy-counterfeiting copy protection paper of a full-function type, which is overprinted with a gradation print layer incorporating a camouflage pattern, which is disclosed in Japanese Patent Publication No.

[0004]

However, in these conventional proposals, when copying is performed with a copy density suitable for each latent image, a latent image or a warning image by characters is clearly revealed. When the copy density deviates from the predetermined range, these warning image portions become unclear, which makes it difficult to distinguish them from the background portion. For example, when the density adjustment of a color copying machine is set to a light level, both the warning image portion and the background portion are copied at the same light density, making it difficult to identify with the naked eye.
It becomes noticeable when it overlaps with the amount of money, the issue date, the title, etc. This phenomenon is due to the limit value of the reproduction lens of the color copying machine, and occurs when the density exceeds the fixed density range. The full-function copy forgery prevention paper disclosed in Japanese Utility Model Publication No. 3-15338 does not have such inconvenience, but a new inconvenience that the design of the printed matter is restricted by adopting the gradation printing layer. Occurs. The present invention eliminates the inconveniences that these conventional anti-counterfeit printed materials have, and in color copying over a wide range from high density to low density, a clear warning image or background appears, and the warning image becomes clear. It is an object of the present invention to provide a distinguishable copy / counterfeit printed matter.

[0005]

SUMMARY OF THE INVENTION The inventor of the present invention, when printing a warning image portion and a background portion with different screen rulings by printing with a plurality of different color inks, when copying this printed matter with a color copying machine. , Each color of cyan, magenta, yellow, and black is scanned, and when each color toner is transferred onto the substrate, it corresponds to each latent image part printed in multiple colors at the specific copy density set by the density adjustment mechanism. It was found that only the warning image part or the background part that is printed is copied. The present invention has been made based on this finding, in which a warning image portion is composed of at least two color inks on a substrate surface, and a background portion is also composed of at least two color inks identical to the warning image portion. ,
The warning image portion and the background portion of the same color ink are printed with different screen rulings.

In the above-mentioned printed matter, by adjusting the ink density and / or the screen density of the warning image portion and the background portion, a clearer warning image or background is exposed over a wide range from dark to light. It is possible to obtain a printed copy for preventing copy forgery. In addition, the number of screen lines is 1 for the warning image part of one color ink.
50 to 80 lines per inch (2.54 cm) and a screen density of 5 to 80%, and the background portion is set to 100 to 180 lines per 1 inch (2.54 cm) of the screen line number, and a screen density of 5 to 80%. The warning image part of the other color ink has a screen ruling of 1 inch (2.54
cm) 100 to 180 lines, screen density 5 to 8
0% and the background part has a screen ruling of 1 inch (2.5
4 cm) 50-80 lines, screen density 5-80
% Is preferable.

[0007]

The warning image portion and the background portion are composed of two or more different color inks of the same color, and the same ink color of the warning image portion and the background portion is printed with different screen rulings to print the printed matter. When copying with a copying machine, even if the density is biased to one side by adjusting the density of the color copying machine, the printed part of at least one of the printed colors is visible in a visually recognizable state. To do.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Here, FIG. 1 is a perspective view schematically showing a printed matter having a warning image portion made of characters printed in a first color and a background portion made of a ground pattern, and FIG. 2 is a similar view printed in a second color. FIG. 3 is a perspective view schematically showing a printed matter having a warning portion and a background portion, FIG. 3 is a perspective view schematically showing a printed matter printed by overlapping two colors, and FIG. 4 is another embodiment using two color inks. FIG. 5 is a perspective view schematically showing the copied state.

First, a description will be given of the first embodiment in which cyan is used as the first color and magenta is used as the second color. As shown in FIG. 1, the print state of the cyan color as the first color is as shown in FIG. On the surface of the substrate 1, a warning image portion composed of the character 2 of "copy" is printed with a screen line number of 65 lines and a screen density of about 15%, and the ground pattern 3 part other than the character 2 is used as a background portion and the screen line number is 150 lines. , Print with a screen density of about 15%. The printing state of the second color, magenta, is as shown in FIG.
On the surface, a warning image portion consisting of the character 2 of "copy" is printed with a screen ruling of 150 lines and a screen density of about 10%, and the ground pattern 3 portion other than the character 2 is the background portion and the screen ruling is 65 lines. Print with a screen density of about 10%. FIG. 3 shows a state in which two colors of cyan and magenta are overprinted under the above printing conditions.

According to such printing, even a person who observes very carefully can see the letters 2 and the ground pattern 3 with the naked eye.
It is impossible to distinguish and visually recognize the parts. Also,
Although not shown, various kinds of prints such as a title and an amount of money can be printed on the substrate 1 in the same manner as an ordinary printed matter. Then, when this printed matter was copied by a color copying machine (Color Laser Copier 500, manufactured by Canon), the following results were obtained, and it was obvious that it was a copied matter.

When copying is performed with the lightness adjustment of the color copying machine set to the lightest state, the screen line number of the cyan ink is 65 lines, the printed portion with a screen density of about 15% and the screen line number of the magenta color ink is 150 lines, Character 2 with overprinted print area with screen density of about 10%
Only part was confirmed in cyan.

Further, when the light and shade adjustment of the color copying machine is set to a moderate state, the screen line number of the cyan ink is 65 lines, the printed portion with a screen density of about 15% and the screen line number of 150 lines of the magenta ink, and the screen. Cyan and a slight magenta color were confirmed in the 2 parts of the character printed overprinting the density of about 10%. The number of screen lines was 150 lines with cyan ink, and the print part with about 15% screen density and magenta color ink. A magenta color and a slight cyan color were confirmed in the ground pattern 3 part in which the printed part having a screen line number of 65 lines and a screen density of about 10% was overprinted.

Further, when the tint adjustment of the color copying machine is set to the darkest state, the screen line number is 65 lines with the cyan color ink, the printed portion with the screen density of about 15% and the screen line number 150 line with the magenta color ink, Character 2 with overprinted print area with screen density of about 10%
The part becomes cyan with a strong purple color, while the number of screen lines with cyan ink is 150 and the screen density is 15%.
About 3 parts of the background pattern on which the approximately printed portion and the printed portion having the screen frequency of 65 lines and the screen density of about 10% by the magenta color ink were overprinted became a magenta strong purple.

Next, a description will be given of a second embodiment in which 20% by weight of cyan and 80% by weight of cyan are mixed as a first color to dilute cyan with a medium and magenta is used as a second color. As shown in FIG. 1, the print state of the cyan color diluted with the first color medium is a warning image portion consisting of the letters 2 of “copy” on the surface of the substrate 1 of the printed matter, the screen frequency is 65 lines, and the screen density is Printing is performed at about 18%, and the background portion, which is the ground pattern 3 portion other than the character 2, is printed at a screen ruling of 150 lines and a screen density of about 18%. Further, as shown in FIG. 2, the printing state of the magenta color which is the second color is as follows.
The warning image part consisting of the character 2 of "copy" is printed with a screen line number of 150 lines and a screen density of about 18%, and the ground pattern 3 part other than the character 2 is used as a background part with a screen line number of 65 lines and a screen density of 18%. Print with a degree. FIG. 3 shows a state in which two colors of cyan and magenta diluted with medium are overprinted under the above printing conditions.

According to such printing, as in the first embodiment, even a person who observes very carefully cannot visually recognize the character 2 portion and the ground pattern 3 portion by distinguishing them with the naked eye. is there. Although not shown, various kinds of prints such as a title and an amount of money can be printed on the substrate 1 in the same manner as an ordinary printed matter. Then, when this printed matter was copied by a color copying machine (Color Laser Copier 500, manufactured by Canon), the following results were obtained, and it was obvious that it was a copied matter.

When copying is performed with the lightness adjustment of the color copying machine set to the lightest state, the number of screen lines is 150 lines with a cyan color ink diluted with medium, the printed portion with a screen density of about 18% and the screen line with a magenta color ink. Only 3 parts of the ground pattern in which several 65 lines and a printed part with a screen density of about 18% were overprinted were confirmed in magenta, and 2 parts of the character were raised in white.

Further, when the light and shade adjustment of the color copying machine is set to a moderate state, the number of screen lines is 150 lines and the screen density is 18% by the cyan color ink diluted with medium.
About 65 printed lines with a magenta color ink and 65 printed lines with a screen density of about 18%, and the background pattern 3 part with overprinting a printed density of about 18% is magenta. Cyan color and slight magenta color were confirmed in the character 2 part where the printed part with a screen density of about 18% and the screen ruling of 150 lines with magenta color ink and the printed part with a screen density of about 18% were overprinted.

Further, when the tint adjustment of the color copying machine is set to the darkest state, the screen line number of the cyan ink is 150 lines, the printed portion with the screen density of about 18% and the screen line number of 65 lines of the magenta color ink, Magenta and a slight cyan color are confirmed in the three parts of the background pattern on which the printed part with a screen density of about 18% is overprinted, while the printed part with a screen frequency of 65 lines and a screen density of about 18% is printed with cyan ink. Screen line number of 150 lines with magenta ink, screen density 18%
Cyan color and magenta color were confirmed in the character 2 part which was overprinted with about a printed part.

FIGS. 4 and 5 show still another embodiment, in which the warning pattern 4 is printed as the warning image portion and the background pattern 5 is printed as the background portion on the substrate 1 with ink of two colors. is there. In the printed state shown in FIG. 4, it is not easy to distinguish between the warning pattern 4 and the ground pattern 5 with the naked eye, but when this is copied by a color copying machine, the warning pattern 4 becomes clear as shown in FIG. It becomes obvious and it becomes obvious that it is a copy. The ink used in this embodiment may be the two-color ink used in the first embodiment or the second embodiment described above, and the printing conditions for the warning image portion and the background portion are as follows.
For example, it is preferable that the warning image portion has a screen ruling of 65 lines, the screen density of cyan ink is about 15%, and the magenta ink is about 10%, and the background portion has a screen ruling. 15
0 line, screen density is about 15% for cyan ink,
About 10% of magenta color ink is suitable.

The combination of different colors in the present invention is not limited to the combination of the two primary colors described above, but may be a combination of the three primary colors or a combination of the two primary colors or the combination of the three primary colors and the black ink. Further, the camouflage pattern may be printed over the entire surface to make it more difficult to distinguish the warning image portion and the background portion with the naked eye.

[0021]

As is apparent from the above description,
According to the present invention, the warning image portion and the background portion are made of the same ink of two or more colors, and the same ink color of the warning image portion and the background portion is printed with different screen rulings, so that the warning is visible to the naked eye. Although it is almost impossible to distinguish between the image part and the background part, the warning image part and the background part can be recognized with the naked eye when copying with a color copying machine. Since the warning image or the background can be clearly revealed in color copying over a range, the warning image can be clearly identified, the copy is self-explanatory, and the forgery of the printed matter due to the copy can be surely prevented. Produce an effect.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing a printed matter having a warning image portion formed of characters printed in a first color and a background portion formed of a ground pattern.

FIG. 2 is a perspective view schematically showing a printed matter having a similar warning image portion and a background portion printed in a second color.

FIG. 3 is a perspective view schematically showing a printed matter in which two colors are printed in an overlapping manner.

FIG. 4 is a perspective view schematically showing another embodiment using two color inks.

5 is a perspective view schematically showing a state in which the printed matter of FIG. 4 is copied.

[Explanation of symbols]

1 base Two characters 3 ground pattern 4 warning patterns 5 ground pattern

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Claims (4)

(57) [Claims] 1. A printed matter which is printed on the surface of a substrate such that the warning image portion and the background portion can be recognized by the naked eye evenly, but when the copy is made, the warning image portion and the background portion can be visually identifiable. The part is composed of at least two colors of ink, the background part is composed of at least two colors of ink which are the same as the warning image part, and the warning image part and the background part of the same color ink are printed with different screen rulings. A printed matter for preventing copy forgery, which is characterized by 2. The copy forgery prevention printed matter according to claim 1, wherein the warning image portion and the background portion are printed with different ink densities or screen densities. 3. The copy / counterfeit prevention printed material according to claim 1, wherein the warning image portion and the background portion are printed with different ink densities and screen densities. 4. The warning image portion of one color ink is 50 to 50 per 1 inch (2.54 cm) of the screen ruling.
80 lines, screen density 5-80%, background area 100-per 1 inch (2.54 cm)
180 lines and screen density of 5 to 80%, while the warning image part of ink of other colors is 100 to 180 lines per 1 inch (2.54 cm) screen line number, screen density of 5 to 80%, and the background part is 2. The copy forgery prevention printed material according to claim 1, wherein the number of screen lines is 50 to 80 lines per inch (2.54 cm) and the screen density is 5 to 80%.