JPS62944Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to securities, and more particularly to securities that can be prevented from forgery by color copying by providing a diffraction grating pattern.

Conventionally, various attempts have been made to prevent the counterfeiting of securities. For example, there are various methods such as applying various background patterns using thin lines or halftone dots, applying various color patterns using low-density ink, applying special OCR characters, etc. However, although these are effective in preventing handwritten counterfeiting and counterfeiting by adding color to black-and-white copies, they are not effective in preventing counterfeiting using recent color copies.

Therefore, as a result of various research aimed at effectively preventing counterfeiting of securities by copying using color copying, the inventor of the present invention has developed a reflective layer on at least one side of the paper. ,
Furthermore, we have discovered that securities on which a resin layer with a diffraction grating pattern is provided are extremely effective in preventing counterfeiting, and have thus arrived at the present invention.

The present invention will be described below with reference to the drawings.

FIG. 1 is a plan view schematically showing an example of the securities of the present invention in the case of a stock certificate, and the securities have predetermined information 2 printed on paper 1 and a diffraction grating. It has a configuration including a pattern section 3 . Predetermined matters 2 are printed in the same way as ordinary securities. Further, if necessary, colored patterns 4 and the like are printed in the same manner as ordinary securities. As shown in FIG. 2, the enlarged cross-sectional view of the diffraction grating pattern portion 3 is as follows.
It consists of a laminate of a reflective layer 5 and a resin layer 6 having a diffraction grating pattern.

If an attempt is made to forge a security with such a configuration using a color copy, the diffraction grating pattern section 3 will look different depending on the viewing angle in the original, but when it is copied, the light in a certain direction of the copy will appear. Not only are several colors fixed, but the pattern 7 as shown in Figure 3 is determined, and there is no longer any possibility that the colors will look different depending on the viewing angle. , you can tell at a glance that it's a fake. In this way, the present invention aims to prevent counterfeiting by utilizing the fact that once the diffraction grating pattern is copied, it is fixed to a certain pattern and the diffraction grating pattern can no longer be seen.

In the above, the reflective layer constituting the diffraction grating pattern portion is provided to make the diffraction grating pattern of the resin layer having the diffraction grating pattern even more visible since the paper constituting the securities is not reflective.
For example, it is provided by printing with gold or silver ink, pasting aluminum foil, or stamping with foil. In addition, the resin layer having a diffraction grating pattern can be formed by pasting a thermoplastic resin film such as polyvinyl chloride or acrylic resin on the reflective layer, or by forming a film of these resins by coating or printing, and then applying heat press. The diffraction grating pattern can be provided by creating a diffraction grating pattern by , cutting, photographic technology, or the like. For example, by stamping silver foil on part of the paper,
Furthermore, after coating 10μ of polyvinyl chloride on top of that, using a mold with a diffraction grating pattern,
A diffraction grating pattern portion can be provided by stamping at 150°C. In addition, in the present invention, it is also possible to paste a resin layer on which a diffraction grating pattern is previously provided on the reflective layer, but since heat fusion is used during pasting, there is a risk that the diffraction grating pattern will disappear or become weakened. I don't like it very much.

As is clear from the above explanation, the present invention is applicable to stock certificates,
It is extremely effective in preventing counterfeiting of various securities such as checks, bills, gift certificates, lottery tickets, bonds, certificates of deposit, investment certificates, admission tickets, and tickets.

Example A company mark for stock certificates and the like was printed with metallic luster ink such as silver or gold ink, and further coated with a colorless polyvinyl chloride layer. next,
A press mold with an unevenness of approximately 1μ pitch was heated to 150℃.
The polyvinyl chloride layer was heated and stamped to form irregularities corresponding to the mold on the surface of the polyvinyl chloride layer.
When this was visually observed under visible light, the reflected light from the areas printed with silver ink appeared to change color depending on the viewing angle. When this stock certificate, etc. was copied using a Fuji Color Copy Machine FCB-B430 manufactured by Fuji Photo Film Co., Ltd., the color of the company mark above was partially changed in the copy, but it did not change depending on the viewing angle.
It was clearly different from the real thing.

[Brief explanation of the drawing]

FIG. 1 is a plan view schematically showing an example of the securities of the present invention in the case of a stock certificate, FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIG. FIG. 2 is a plan view schematically showing the state of the illustrated securities. DESCRIPTION OF SYMBOLS 1...paper, 2...predetermined matter, 3 ...diffraction grating pattern part, 5...reflection layer, 6...resin layer with a diffraction grating pattern.

Claims (1)

[Scope of utility model registration request] A reflective layer made of silver, gold, aluminum foil, or ink with a metallic luster such as gold ink or silver ink is provided on at least one side of the paper on which the specified information is printed, and a diffraction layer is further applied on the reflective layer. A security having a resin layer with a grid pattern.