JPS6079991A - Printed matter suitable for preventing duplication - Google Patents

Abstract

PURPOSE:To favorably finish the surface of a printed mater and enable to discriminate a copy, by a method wherein a latent image is printed by using fine picture constituents, a background is printed by using fine picture constituents of a different shape, and a decorative pattern is overlappingly printed in a light-colored transparent ink. CONSTITUTION:The latent image 2 is printed on the surface of a paper 1 by using dots, and simultaneously, a background with a density equal to that of the latent image 2 is printed by using solid line instead of dots. The decorative pattern 4 is overlappingly printed on the surface of the latent image 2 inclusive of the background, in a transparent ink of such a light color that it can not be reproduced by duplication. When the printed matter thus obtained is duplicated, the pattern 4 becomes invisible, the background 3 is reproduced, and the latent image 2 is not reproduced, so that a distinct difference in density is generated between the background 3 and the latent image 2, and the copy can be discriminated to be a copy at a glance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a well-appearing printed matter suitable for preventing forgery by a copying machine.

To prevent important documents such as securities from being forged using color copiers, rVOI, which is difficult to discern with the naked eye, is printed on the surface of the paper.
It has already been proposed that a warning mark such as a DJ is printed on the copying machine so that the warning mark can be distinguished from the background and be visually recognized when the copying machine is used.

As a prior art of this kind, the background is composed of fine halftone dots,
A document is known in which the warning mark is composed of halftone dots that are twice the size of the background, and an overlying cam 72 is provided for both of them so that the background and the warning mark can be distinguished with the naked eye. There is.

However, even before the above-mentioned prior art, documents with warning marks consisting of halftone dots of different sizes from the background had been considered, but there were some drawbacks that should be noted in such cases.

Therefore, although the provision of camouflage is effective in making the warning mark difficult to identify, the document also has various disadvantages and has not been put to widespread use.

First of all, the document uses a hybrid mask of warning marks, surrounding background, and camouflage. By using a hybrid mask, the plate configuration before printing is naturally a halftone plate, and as shown in Figure 1, after printing, paper A
It is obvious that the ink layer B applied to the top surface is printed in one layer, and the resulting printed matter is bland and has a uniform color with only large and small halftone dots arranged thereon.

Secondly, the printed matter obtained by such a plate structure is disadvantageous in that the warning mark after copying cannot be clearly recognized. In a combination of halftone dots with the same shape, if the size difference between the dots is extreme, the warning mark will be visible to the naked eye even if a camouflage is installed, so we added a restriction that the warning mark must be a multiple of the screen used for the background. Due to this, there are problems with reproducibility after copying, and some of the camouflage remains along with the warning marks, making it unsightly.

Thirdly, since camouflage is printed on a uniform plane with warning marks, it is not possible to create a free design and it is impossible to achieve a decorative effect, making it almost impossible to add a sense of beauty to printed matter. The disadvantage is that it spoils the appearance of the document and is not practical.

The present invention provides a single stamp that overcomes the disadvantages of the prior art described above.

The present invention will be described below with reference to the drawings. As shown in FIGS. 2 to 4, 150 lines 10
A latent image 2 is printed with halftone dots of approximately 100 mm, and a background 3 with the same density as that of the latent image 2 is simultaneously printed on the white area around the latent image, with 50 lines and 10% lines. ,
Then, on the upper surface of the latent image 2 including the background, a decorative pattern 4 such as a background pattern or herringbone is overprinted with transparent ink of a light color that cannot be reproduced by copying.

In this way, the fine constituent elements of latent image 2 are halftone dots of about 150 lines and 10%, while the fine constituent elements of background 3 around the latent image are halftone dots of about 50 lines and IO%, and both are The feature is that the shapes of the constructors are different. Therefore, if you carefully observe the latent image 2 before overprinting the decorative pattern 4, you can faintly identify the latent image 2, but after overprinting the decorative pattern 4, both are obscured and cannot be identified with the naked eye. It appears that only pattern 4 exists on the surface of the paper.

This pattern 4 is of such a light color that it cannot be reproduced by copying, so when it is copied, the pattern 4 cannot be seen, whereas the background 3 printed with parallel lines is reproduced, and the latent image 2 is As a result of not being reproduced, the density difference between the background 3 and the latent image 2 becomes obvious, and the letters r C0PYJ are clearly recognized, so it can be seen at a glance that it is a copy. (6th
(Fig.) This shows another actual appearance when the background 3 is printed with 150 lines and about 10 dots, and by doing this, the latent image 2 is reproduced when it is put on a copying machine. On the other hand, since the back pin 3 is no longer reproduced, a difference occurs between the two and the latent image 2 is clearly identified.

Finally, as is clear from the above two embodiments, the present invention is configured so that the background or latent image printed with parallel lines is reproduced by copying, and the latent image or background printed with halftone dots is not reproduced. It is characterized by this.

Note that the constituent shapes of the parallel lines and halftone dots are not limited to those shown.

That is, the present invention prints a latent image 2 made of fine constituents on the surface of a paper 10, and also prints a background 3 made of fine +YIII constituents having a different shape from the above mentioned constituents in the white area around the latent image.
By simultaneously printing , and overprinting a light-colored iA bright ink decorative pattern 4 that cannot be reproduced by copying on the upper surface of the latent image 2, the cross-sectional shape of the paper 1 is changed as shown in the third figure.
A single-color multi-ink layer of a latent image 2 and a background 3 are formed on the upper surface, and an ink layer of a decorative pattern 4 is further superposed on the upper surface. Therefore, the plate configuration before printing is such that the latent image and the decorative pattern are separate plates, which is a big difference from the prior art described above. As a result of this separate edition, decorative pattern 4
The design and color tone can be freely selected, and if a pattern is formed according to the printed material, it can be applied to a wide range of documents and is extremely useful in practice.

As a result, the randomly selected decorative pattern 4 assimilates the reproducible parallel lines, and as a result, the latent image and the background are sufficiently obscured, making it completely difficult to distinguish between them with the naked eye, and the decorative pattern is pale in color. 4 cannot be reproduced when it is applied to a copying machine, so after copying, the latent image 2, which has a noticeable difference in density from the spine 1λ, clearly appears and can be identified.

The microstructure forming the latent image 2 and the background 3 is unique in that it is not a combination of points of the same shape as in the prior art, but has a completely different shape. This is due to significant structural differences.

By making the constituent elements different shapes as described above, the surface of the paper 1 can be printed in various ways without being restricted by the size of the dots as in the prior art, and as a result, the decorative pattern 4 finishes the surface of the printed matter beautifully and with good appearance. It has great practical benefits for a wide variety of documents.

[Brief explanation of the drawing]

FIG. 1 is a schematic enlarged sectional view of a printed matter based on the conventional prior art with anti-counterfeiting measures, FIG. 2 is a schematic plan view of a printed matter according to the present invention, and FIG. 3 is a partially enlarged sectional view of the same. Figure 4 is a partial plan view of the present invention before overprinting the decorative pattern;
The figure is a partial plan view showing another embodiment, and FIG. 6 is a plan view of a copy of the printed matter of the present invention. l is paper, 2 is m image, 3 is background, 4 is decoration ((, (Patent applicant: Hosokawa Letterpress Co., Ltd. Patent attorney: Yukihiko Kaneko

Claims (1)

[Claims] 1. Printing a latent image called a fine construct on the surface of the paper, and simultaneously printing a background consisting of a fine construct having a shape different from that of the said construct on the white area around the nuclear latent image. However, a decorative pattern is overprinted on top of the latent image using light-colored transparent ink that cannot be reproduced by copying, thereby creating a printed matter suitable for preventing copying. 2. The printed material according to claim 1, wherein the latent image is printed with a halftone dot-like fine structure, and the background is printed with a parallel line-like fine structure. 3. The printed material according to claim 1, wherein the latent image is printed with line-like fine structure elements, and the background is printed with halftone dot-like fine structure elements. 4. A printed matter according to claim 2, in which fine components of the latent image are not reproduced by the line copying machine, but fine components of the background are reproduced by the copying machine. 4. The printed matter according to claim 3, wherein the background fine structure is not used by a copying machine.