JPS59202899A - Print to which forgery-preventive measure is executed - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] TECHNICAL FIELD The present invention relates to printed matter with anti-counterfeit measures.

Printed materials such as checks, securities, paperbacks, credit cards, commuter passes, driver's licenses, identification cards, etc. are usually subject to various counterfeit prevention measures, but the present invention provides a completely new method of counterfeit prevention. It provides a means of prevention.

In today's society where photography and printing technology are highly developed, the printed materials mentioned above are always at risk of being counterfeited.One way to prevent counterfeiting is to make these printed materials easily available. For example, sheets with watermarks, colored fibers, or metal fibers are still used today.The present invention also basically The purpose is to apply counterfeit d prevention measures to printed materials using materials that are not easily available.

More specifically, the provision of an outer surface that exhibits iris color provides a counterfeit prevention measure for printed matter.

Printed matter to which the anti-counterfeiting measures of the present invention have been applied produce interference fringes in a unique iris color depending on the viewing angle, and it can be easily determined by visual inspection that the printed matter is not a forgery.

The mechanism itself for producing interference fringes is known, and examples of its application to transfer foils are also known. However, there has never been an example of using this as a means of preventing counterfeiting.

In order to develop interference fringes, a thin film layer having an optical thickness equivalent to a predetermined wavelength minus an odd multiple of the wavelength is formed on the substrate.The material for forming the thin film layer is, for example, A
IF 3, A120s, A12E+3, Bi2O3,
Bi253, B1Se3.0e02, cdsXCr20
31Cu20) Fe203, Fe304pn2o3, M
gF2, MgO1FbF2, PbO, 5b203, Sb
2S3, EliO1Si02.5n02, Ti01T
iC+2, I%'05, ZnO, ZnS XZrO2
, etc. By changing the type and film thickness of the thin film forming substance, the interference color changes. For example, when a thin film of 5i02 (refractive index 1.47) is formed on an 81 substrate, it becomes orange at a VVAi thickness of 0.25/1 m. Color, 0.5
01tTn is green, and 1.0 μm is pink.

By forming the thin film layer into multiple layers rather than a single layer, and due to the unevenness of the substrate and subtle changes in the thickness of the thin film layer, the interference color comes to exhibit an extremely biaxial iris color.

Known methods such as vacuum evaporation, sputtering, CVl:1 method, etc. are used to form the film layer. ○If the physical strength of the thin B layer is insufficient, the surface may be coated with acrylic, nitrocellulose, A protective layer may also be formed on 841 such as polyurethane.

In this case, the protective layer also has an optical thickness that is an odd number multiple of one wavelength.

It is desirable to form the It is also possible to add a colorant to the protective layer.

As a means for providing interference fringes that express iris color on printed matter, methods such as gluing and transfer can be used. The present invention will be described in detail below with reference to Examples.

Example-1 On the surface of a 20 μm thick polyester film, a two-component curing polyurethane resin was applied to a thickness of 0.5 μm after drying.
1 (3-6To
0.4μ of 5b2s3 vapor deposited film with rr? +', EI
A deposited film of i02 was formed to a thickness of 0.5μ7n. The thus produced vapor-deposited film was cut into strips and pasted onto the signature area of a credit card using a hardening adhesive. Even if an attempt was made to tamper with the signature part of this credit card, it was firmly attached to the signature part of the credit card. - Obtaining a vapor-deposited film that exhibits colored interference fringes (which is practically impossible); Credit card (which has anti-counterfeiting ability); The vapor-deposited film of Example 1 was attached to the entire surface of a paper-bound identification card with a larger size using a hardening adhesive to obtain an identification card with anti-counterfeiting properties.

Example - A polyester film with a thickness of 10 μm was provided, a polyurethane protective layer with a film thickness of approximately 1.5 μσ was applied thereon, and then A1
A thin film of 0.3 μm for Sn03 and 0.5 μm for Sn02 was formed. Next, reflective J lead of metal aluminum was formed to a thickness of 0.11 zm using a vacuum evaporation apparatus. Then above this (
A transfer foil was completed by applying 0.1 mm of this heat-sensitive adhesive Δl. like this? Using the transfer foil thus obtained, the company emblem of the company emblem of the stock certificate association was engraved using a heated letterpress plate to transfer the company emblem.

The stock certificate obtained in this way has extremely beautiful iris-colored interference fringes on the lapel emblem, and even with the use of advanced technology, this part cannot be forged (virtually inedible). Ta.

As described above, the present invention is an anti-counterfeiting measure by developing colored interference fringes on part or the entire surface of the Japanese printing press, and also has an aesthetic effect. It has excellent productivity and can be produced at a relatively low cost, making it a highly useful invention.

Claims (1)

[Claims] A printed product that has an anti-counterfeiting feature and is characterized by having an outer surface that exhibits iris-colored interference fringes.