JPS6013598A - Forgery-preventive print - 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] related to printed matter.

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, so there is a growing need for counterfeit prevention.

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-mentioned points, this Kenmei is designed to provide printed matter that is prevented from being counterfeited by copying, and furthermore, printed matter that is prevented from being copied.

That is, the present invention relates to a counterfeit-preventing or copy-preventing printed matter, which is provided with printing of desired items and an iris layer on a support.

The iris layer changes color depending on the viewing angle. Current color copying techniques cannot produce faithful color copies of such iris layers. For example, when the iris Rj is copied using a color copying card currently available on the market, generally only a copy image of a cured blue color is obtained, and the difference from the actual iris layer is obvious at first glance. Furthermore, even if color copying technology has advanced beyond its current level, it is thought that it will never be possible to produce a copied image that exhibits a QL color pattern that varies 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 copied in color, at least the portion of the iris t= will not be transformed into a faithful projected image, and therefore, forgery due to copying can be prevented.

Further, as mentioned above, even if the rainbow-shaped haj is copied using a commercially available color copying method, only the dark blue initial image will be changed. On the other hand, when printing using ordinary black or blue printing ink is performed using the color copying shield, the resulting copy image becomes black with a slight bluish tinge. 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 Jf4 is provided at least partially overlapping with the printing or in close or close proximity to the printing is reproduced in color, the copied image of the printed portion is separated from the copied image of the iris layer. Since the contents cannot be determined, the contents cannot be read and cannot be copied.

Furthermore, the mainstream of current single-color copying machines is the ppo electrophotographic copying machine, which allows the printed image of both the iris layer and the printed part to be changed to black when copying the printed matter of the present invention. Therefore, 4q photography is still impossible.

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 printed with the desired ψ term. 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 B1 are partial cross-sectional +fi diagrams showing each keyaki embodiment of the printed matter of the present invention.

The 11 seal notifications in Figure 1 have an iris layer (2) on the support (1).
is provided on the entire surface, and on top of that, printing (3) is provided. Hereinafter, the iris layer provided entirely on the support (1) will be referred to as the iris layer (2ti).

The printed matter in FIG. 2 is one in which printing (3) is further applied on support (1), and then an iris layer i (2) i is provided over the entire surface.

The printed matter of z 37 is first provided with glsl iris 1iD 02i on the support (1), and then the iris layer (2
Printing (3) is provided so as to partially overlap 2+.

The printed matter of Fig. 4 is obtained by first providing the printing (3) on the support (1), and then applying the printing (3) so that it overlaps with the printing (3) or the entire printing (3)). A partial iris J arm (231) is provided.In this embodiment G, if the partial iris m (23) is completely matched with the printing (3), there is an effect of preventing forgery, but it is difficult to copy. The preventive effect disappears.

The prints in Figure 5 are print (3) and partial iris T4 (24
) are provided closely or closely in the plane direction. In order to obtain a copy prevention effect in this embodiment, it is necessary to at least partially bring the printing (3) and the partial iris layer (24) into close contact with each other in order to make the content of the copied image of the printing (3) illegible. be.

As the support (1) used in the present invention, paper, synthetic paper, resin film, laminates thereof, etc. can be used.

Printing (3) includes all printing obtained by conventional methods such as letterpress, intaglio, gravure, and screen. The concept also includes toner images obtained by electrophotographic copying, transfer images etched by pressure-sensitive printing, thermal printing, and the like.

Various materials can be used as the iris layer (2), but the main ones are as follows.

(1) A single-layer thin film of one or more iris substances such as copper iodide, lead bromide, magnesium fluoride, zinc sulfide, antimony oxide, aluminum fluoride, titanium oxide, silicon oxide, and silicon dioxide. or laminated; film. These thin films are formed by vapor deposition methods (including vacuum evaporation methods, sputtering methods, ion blating methods, etc., hereinafter referred to as 5), but titanium oxide and the like are formed from titanium tetrachloride etc. by vapor phase chemical deposition methods. It's okay. The thickness of these thin films is usually about 5 to 5 [] Omp.

(2) A combination of a thin film of the iris substance described in (1) above and a gold iris film. Examples of this type of iris layer are 8th to 10th.
As shown in the figure. In Figures 8-10, the arrow indicates that the iris is applied to this side.

The iris layer in FIG. 8 includes a metal thin film (3) with a large thickness so as to have a sufficiently strong fouling ability on the back side of the thin film field of the iris material.
1 are laminated. The thickness of the metal thin film (31) is approximately 50 to 150 mμ. Examples of metals used include aluminum, zinc, chromium, nickel, bismuth, tin, silver, gold, copper, platinum, palladium, indium, and rhodium. The metal thin film Gi+ is usually formed by a vapor deposition method. ' The iris layer in Fig. 9 is made by laminating thin R (1 (3)) on a thin translucent gold that can transmit light to the nit surface on the thin film side of the iris substance. The thickness of the mosquito is 1 to 20
It has a visible light transmittance of about 30 to 70%. The metal used for the metal thin film@, the formation method, etc. are the same as those for the metal thin film (31).

The iris layer shown in FIG. 10 is a thin film of iris material (a thin metal film V (Co., Ltd.) is laminated on the front side of the row, and a thin metal film 011 is laminated on the back side of the row).

(3) As shown in FIG. 11, the iris material thin film (30) in the iris layer of FIG. 10 is slightly replaced with an interference resin film. The iris layer with this structure is based on the principle of a reflective interference filter (the optical thickness of the transparent PJ7 film is 17 mm
When the wavelength corresponds to an odd multiple of 4 wavelengths, the reflectance of that wavelength is maximum.
The reflection peak can be changed over the entire range. The interference resin film (33) is a coating layer of uncolored transparent or colored transparent nitrocellulose, acrylic TD resin, alkyl resin, epoxy resin, etc., and its thickness is usually 1.5 μm or less, A desired iris gloss can be obtained by appropriately selecting the optical thickness. Note that a more vivid iris luster can be obtained by privately increasing the nonuniformity of the film thickness by providing unevenness on the side of the interference resin film.

(4) A large number of layers (for example, 100 or more layers) of resin films having different refractive indexes are laminated alternately. Examples of combinations of resins having mutually different refractive indexes include combinations of engineered 7-acetic acid D-vinyl copolymer and polystyrene, polyester and polymethyl methacrylate, and the like.

The iris layers of OXj (1) to (4) all have a forgery prevention effect. To prevent copying, follow (2) and (3) above.
) is preferred.

In the embodiments of FIGS. 2 and 4, the iris layer Qυ, (23) needs to be transparent so that the printing can be seen through, and for that purpose, the iris layers (1) and (4) are preferable.

In the embodiments of FIGS. 1 and 2, the iris layer is provided on the entire surface, so it is sufficient to form the iris layer as it is 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 in (4) above can be replaced with one having a larger diameter of 11, a separately prepared iris layer may be laminated in the 1-balance shown in Figs. 1 and 2 above.

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 is made of a suitable resin on the iris layer (2) as shown in FIG. A coating layer (4) may be formed and printing (3) may be provided thereon. In order to protect the iris layer (2) and the printed layer (3), as shown in Fig. 7, the iris R''; J.C. (51) may also be provided.

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 iris layer (2) and the support (1) are sufficiently dense, an undercoat layer may be provided as appropriate.

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

Example 1 A 100 mμ thick chromium evaporated layer "1" was formed on one side of coated paper with a thickness of 60 f/m by a vacuum evaporation method, and a 25 mμ thick copper iodide evaporated layer was then formed by a G4 vacuum evaporation method. A printed matter was obtained by printing black letters on it using a gravure printing machine.

Example 2 Aluminum WBI with a thickness of 100 mμ was deposited on the entire surface of one side of a polyethylene terephthalate film with a thickness of 12μ by vacuum deposition. J, thickness 0.
Prints were obtained by printing black letters on a 20 mμ thick Alvia printing machine using a 5μ coating layer of polymethyl methacrylate and a vacuum evaporation method.

Example 3 Tsubo fa: Black characters were printed on one side of coated paper of 6017 m2 using gravure printing, and titanium oxide with a thickness of about 400 mμ was vapor-deposited on the entire surface of the printed coated paper by vacuum deposition method. ) was established to obtain printed materials.

Example 4 An aluminum evaporator with a thickness of 20 mμ was placed on a heat film with a release layer interposed therebetween, a polymethyl methacrylate layer with a thickness of 0.5μ, an aluminum adhesion layer with a thickness of 100 mμ, and a vinyl acetate system with a J thickness of 2μ. Using a transfer foil formed by forming an adhesive layer in this order, the iris layer was transferred in the form of a band onto coated paper with a 60 g/m2 cast, and black letters were printed on the band-shaped iris layer i using a gravure printing machine. I printed it and got the printed material.

Example 5 A transfer foil was prepared by forming a titanium oxide vapor deposited layer with a thickness of about 400 μm and a vinyl acetate adhesive layer with a thickness of 2 μm in this order on a base film via a release layer.

On the other hand, black characters were printed on one side of a coated paper of 1': t, 60 g/m using a gravure printing machine, and then the transfer foil was used to cover the characters to give a stopping effect and an anti-copying effect. Examined. The results are shown in Table 1. The anti-counterfeiting effect was investigated using a commercially available color copying machine. The anti-projection effect was investigated using a commercially available PPA Lumi type color electrophotographic camera.

Note 10 in Table 1: The entire iris layer appears to be dark blue,
Almost no iris luster was exhibited.

Note 20 Mark: Both the iris layer part and the text part were black and the text was impossible to read.

×: Characters were legible.

Example 6 In Example 2, % aluminum with a thickness of 20 mμ
4? A 1 μm thick top coat layer was formed on the entire surface of JFJ using melamine-alkyd resin, and a printed matter was obtained in the same manner as in Example 2, except that letters were printed thereon.

Example 7 A printed matter was obtained in the same manner as in Example 4, except that a HD top coat layer was provided on the entire surface of the coated paper on which the printing and iris layer had been provided.

[Brief explanation of drawings]

FIGS. 1 to 7 are partial sectional views showing each embodiment of the printed matter of the present invention, and FIGS. 8 to 11 (respectively, partial cross-sectional views showing each aspect of the iris layer used in the present invention). (Main symbols in the drawing) (1): Supports (2), (20), t2+, l, (22), t231.
t241: Iris IQ (3): Print Figure 1 ``''1 Year 2 Figure 23 Figure 4 Age 5 Figure 6 Figure 27

Claims (1)

[Scope of Claims] 1. An anti-counterfeiting printed matter comprising a support with printed desired items and a rainbow Wfo. 2. An iris layer is provided on the entire surface of the support, and the iris 1
Claim 1, in which printing is provided on top of SYU.
Printed material mentioned in section. 6. 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.