JPS6249199B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to printed matter that is prevented from forgery, particularly by copying.

Although counterfeiting is undesirable under any circumstances, counterfeiting has a large impact on securities, banknotes, credit cards, gift certificates, admission tickets, etc.

With the recent development of color copying machines, it has become relatively easy to forge these printed materials.
There is a growing need to prevent counterfeiting.

Although they are not forgeries, there are many secret and important documents that would be problematic if they were copied and their contents were leaked.

In view of the above points, the present invention provides a printed matter that is prevented from being forged by copying, and furthermore, a printed matter that is prevented from being copied.

That is, in the present invention, desired items are printed on a support and an iris layer is provided, the iris layer is made of a layered material in which a large number of resin layers having different refractive indexes are alternately laminated, and a metal layer is provided. This invention relates to an anti-counterfeiting printed matter characterized in that it does not contain any of the following:

The iris layer has different colored iris patterns depending on the viewing angle. Current color copying techniques cannot produce faithful color copies of such iris layers. For example, when the iris layer is copied using currently commercially available color copying machines, only a dark blue copy image is generally obtained, and the difference from the actual iris layer is obvious at first glance. Furthermore, even if color copying technology were to develop beyond its current level, it would be impossible to obtain a copy that exhibits an iris pattern of different colors depending on the viewing angle. Therefore, even if the printed matter of the present invention, in which both the iris layer and the printing are present, is reproduced in color,
At least in the iris layer, a faithful copy image cannot be obtained, and therefore, forgery due to copying can be prevented.

Furthermore, as described above, even if the iris layer is copied using a commercially available color copying machine, only a dark blue copy image will be obtained. On the other hand, when printing using ordinary black and blue printing inks is performed using the color copying machine, a black copy image with a slight bluish tinge is obtained. Therefore, the duplicated images of the iris layer portion and the printed portion cannot be clearly distinguished. Therefore, when a printed matter of the present invention in which the iris layer at least partially overlaps with the print or is provided in close or close proximity to the print is color-copied, the copied image of the printed portion is separated from the copied image of the iris layer. Because the content cannot be determined, the content cannot be read, and it is ultimately impossible to copy (here, "uncopyable" means that a copy of the content that can be read is not available, and the same applies hereinafter).

Furthermore, the current mainstream monochrome copying machine is an electrophotographic copying machine such as PPC, but when the printed matter of the present invention is copied using this machine, a black copy image is obtained for both the iris layer and the printed part. After all, it cannot be copied.

In the present invention, if the sole purpose is to prevent counterfeiting, it is sufficient to provide an iris layer on at least one part of the support surface on which desired items are printed. However, if the purpose is also to prevent copying, it is necessary to consider the relationship between the printing position and the position where the iris layer is provided, as described later.

Next, the present invention will be explained based on the drawings.

1 to 5 are partial cross-sectional views showing various embodiments of the printed matter of the present invention.

The printed matter of FIG. 1 has an iris layer 2 provided entirely on a support 1, and a print 3 provided thereon. Hereinafter, the iris layer provided entirely on the support 1 will be referred to as the iris layer 20.

In the printed matter of FIG. 2, a printing 3 is first provided on a support 1, and then an iris layer 21 is provided over the entire surface.

In the printed matter of FIG. 3, a partial iris layer 22 is first provided on the support 1, and then a print 3 is provided so as to partially overlap the iris layer 22.

In the printed matter of FIG. 4, a print 3 is first provided on a support 1, and then a partial iris layer 23 is provided so as to partially overlap the print 3 or to cover the entire print 3. . In this embodiment, if the partial iris layer 23 is completely aligned with the print 3, there is an effect of preventing forgery, but there is no effect of preventing copying.

The printed matter shown in FIG. 5 is one in which the printing 3 and the partial iris layer 24 are placed in close contact or close to each other in the plane direction. In order to obtain a copy prevention effect in this embodiment, it is necessary to at least partially bring the print 3 and the partial iris layer 24 into close contact with each other so that the content of the copied image of the print 3 cannot be read.

As the support 1 used in the present invention, paper, synthetic paper,
Both resin films and laminates thereof can be used.

Printing 3 includes regular letterpress, intaglio, gravure,
Includes all printing obtained by methods such as screens. The concept also includes toner images obtained by electrophotographic copying, transfer images obtained by pressure-sensitive printing, thermal printing, and the like.

The iris layer 2 used in the present invention is formed by laminating a large number of resin layers (for example, 100 or more layers) alternately having different refractive indexes. Examples of combinations of resins having different refractive indexes include combinations of ethylene-vinyl acetate copolymer and polystyrene, and polyester and polymethyl methacrylate.

All of the iris layers 1 to 4 have a forgery prevention effect.

In the embodiments of FIGS. 2 and 4, the iris layers 21 and 23 need to be transparent so that the printing can be seen through.

In the embodiments shown in FIGS. 1 and 2, the iris layer is provided on the entire surface, so the iris layer may be directly formed on the entire surface of the support 1 or the support 1 provided with the printing 3. In the embodiments shown in Figures 3 to 5, it is necessary to partially provide the iris layer, but since it may be difficult to partially form the iris layer, in that case, a transfer foil having an iris layer is used as the transfer layer. A partial iris layer may be formed using the iris layer.

Since the iris layer used in the present invention has a large film property, in the embodiments shown in FIGS. 1 and 2, a separately prepared iris layer may be laminated.

In the present invention, in order to improve the durability of the iris layer 2 or to improve the printability of the iris layer 2, a transparent top coat layer 4 of a suitable resin is formed on the iris layer 2 as shown in FIG. In addition, printing 3 may be provided. Further, in order to protect both the iris layer 2 and the print layer 3, a transparent top coat layer 5 may be provided on the entire surface in addition to the iris layer 2 and the print layer 3 as shown in FIG.
Furthermore, when a transfer foil is used, a transfer foil having a layer serving as a protective layer for the iris layer may be used as a transfer layer. If the adhesion between the iris layer 2 and the support 1 is poor, an undercoat layer may be provided as appropriate.

Next, the present invention will be explained with reference to Examples.

Example: ^A coated paper with a thickness of 9
A 19 μm thick iris film (pale pink color) consisting of approximately 100 layers of polyester (approximately 1000 Å thick) and polymethyl methacrylate layers (approximately 1000 Å thick) alternately laminated on one side of a μm polyester film. A transparent film with iris luster) was laminated using a polyurethane adhesive, and black letters were printed on it using a gravure printing machine to obtain a printed matter.

The anti-counterfeiting effect of the printed matter obtained in the above example was examined using a commercially available color copying machine. As a result, in the copies obtained from the printed matter of Examples, the entire portion corresponding to the iris layer appeared dark blue, and exhibited almost no iris luster.

[Brief explanation of the drawing]

1 to 7 are partial cross-sectional views showing respective embodiments of the printed matter of the present invention. (Main symbols in the drawing), 1: Support, 2, 20,
21, 22, 23, 24: iris layer, 3: printing.

Claims (1)

[Scope of Claims] 1. Printing of desired items and an iris layer are provided on a support, and the iris layer is made of a layered material in which a large number of resin layers having different refractive indexes are alternately laminated, and is made of a metal. An anti-counterfeiting printed matter characterized in that it does not contain a layer. 2. The printed matter according to claim 1, wherein an iris layer is provided on the entire surface of the support, and printing is provided on the iris layer. 3. The printed matter according to claim 1, wherein printing is provided on a support, and an iris layer that can be seen through the entire surface is provided thereon. 4. The printed matter according to claim 1, wherein an iris layer is partially provided on a support, and a print is provided thereon so as to at least partially overlap the iris layer. 5. The printed material according to claim 1, wherein a printing is provided on a support, and a partially transparent iris layer is provided thereon so as to overlap at least a portion of the printing.