JP2002029138A - Forgery-proof printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forgery-proof printed matter which need not a different process, using the difference in metallic luster without any adverse effect on the improvement of performance of a copying machine. SOLUTION: This forgery-proof printed matter consists of an undercoat layer for forming the difference in metallic luster printed in image lines on a printing paper and a metallic tone ink printed on the undercoat layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forgery-prevention printed matter for preventing counterfeiting by copying gold notes, securities, other important documents, and the like.

[0002]

2. Description of the Related Art Conventionally, forgery of important documents such as gold notes and securities by a color copying machine has been a problem, and techniques for preventing forgery such as halftone dot modulation using fine dots and holograms have been made.

In dot modulation, a printed matter having a background provided with halftone dots having a resolution lower than that of a copying machine and a latent image provided with halftones having a resolution equal to or greater than the resolution is produced. Disappears and a halftone dot having a resolution higher than the resolution of the latent image is copied, so that only the latent image appears on the copy to indicate that the copy is a copy.

The hologram utilizes the fact that the color of reflected light changes depending on the viewing angle provided on the metallic glossy surface by the copying machine and cannot reproduce the light reflection characteristic.

[0005]

However, these techniques have the following problems.

In the dot modulation, when the performance of a copying machine is improved and the resolution is increased, the background intended to be created with a dot having a resolution lower than the resolution is copied, and the effect of the dot modulation cannot be sufficiently obtained. was there.

In the case of holograms, it is difficult to create a hologram by printing, so a hologram-processed seal or foil is prepared in advance, and the hologram is printed separately on a printed matter to be forged and prevented from being forged with a seal sticking machine or a foil stamping machine. The work of pasting was required.

In view of these problems, the present invention provides a forgery-prevention printed matter which is not affected by the improvement in the performance of a copying machine and does not require a separate process.

[0009]

SUMMARY OF THE INVENTION According to the present invention, even if a metallic ink layer is provided on a printing paper by printing, the ink cannot sufficiently fill the unevenness of the surface of the printing paper. Irregularities are generated, light is irregularly reflected by the irregularities on the surface of the metallic ink layer, and good metallic luster cannot be obtained.In addition, ink and varnish are printed on the printing paper in advance to fill the unevenness on the printing paper surface. After printing the metallic ink on it, the surface of the metallic ink layer can be smoothed, and light is not irregularly reflected on the surface of the metallic ink layer to obtain good metallic luster. Is printed in advance with ink, varnish, etc. on the surface, and the unevenness of the printing paper surface in the image area is smoothed by filling it. Kkuinki layer good metallic luster is obtained, to provide anti-counterfeit printed matter characterized in that utilizing the fact that the metallic ink layer on the non-image area can not be obtained a good metallic luster.

[0010]

Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 to 3 show a first embodiment.

An undercoat layer 2 composed of an object on a printing paper 1
Is printed with ink, varnish and the like.

Next, printing is performed with metallic ink 3 so as to cover the portion where the undercoat layer 2 is applied. At this time, it is preferable to change the viscosity of the ink used for the undercoat layer 2 in accordance with the ink absorbency of the printing paper. For example, for printing paper with low ink absorption such as coated paper, ink with low viscosity, varnish etc., for printing paper with high ink absorption such as high quality paper, ink with high viscosity,
It is effective to use a varnish or the like.

The surface of the metallic ink 3 where the undercoat layer 2 is not applied is affected by the unevenness of the surface of the printing paper 1.
Although the surface of the metallic ink 3 has irregularities, the undercoat layer 2 is applied to the printing paper 1 at the place where the undercoat layer 2 is applied.
Since the surface irregularities are reduced, the surface of the metallic ink 3 becomes smooth. As a result, in a portion where the undercoat layer 2 is not applied, the incident light 4
Is irregularly reflected 5, but the surface of the metallic ink 3 where the undercoat layer 2 is applied is smooth and the incident light 4
Is almost totally reflected 6, so that there is a difference between the metallic luster of the area where the undercoat layer 2 is not applied and the metallic luster of the area where the undercoat layer 2 is applied.

Even if the user wants to copy the printed matter, the color copier determines the difference between the glossiness of the portion where the undercoat layer 2 is not applied and the dark color of the portion where the undercoat layer 2 is applied. Since the color difference is reproduced, there is no possibility that the difference in gloss is reproduced, and a sufficient forgery prevention effect can be obtained.

As another embodiment of the present invention, a printing paper 1
That the undercoat layer 2 consisting of the image lines above has gradations,
The metallic ink 3 printed on the undercoat layer 2 has a gradation, the undercoat layer 2 printed on the printing paper 1 and the metallic ink 3 printed on the undercoat layer 2 have gradation. You can also use what you have. (Not shown).

Even if the combination of inks having gradations is changed as described above, the same forgery prevention effect can be obtained.
There are no design restrictions.

[0018]

As described above, according to the present invention, while the surface layer is covered with the same ink, the image area and
Since the non-image area is formed, it is not affected by the improvement of the resolution of the copying machine as in dot modulation, and the undercoat layer composed of the image and the metallic ink are printed in one step by the printing machine. Therefore, it is possible to provide a forgery-preventive printed matter that does not require a separate step of creating and attaching an expensive hologram such as hologram processing.

[Brief description of the drawings]

FIG. 1 is a perspective view of a printed material according to a first embodiment.

FIG. 2 is an enlarged sectional view taken along the line AA of FIG. 1;

FIG. 3 is a diagram of light incidence / reflection in the AA cross section.

[Explanation of symbols]

1. Printing paper 2. Undercoat layer 3. Metallic ink
4. Incident light5. Diffuse reflection 6. Total reflection reference number P00019

Claims (1)

[Claims] 1. An anti-counterfeit printed matter obtained by printing an undercoat layer for forming a difference in gloss on a printing paper and printing a metallic ink thereon.