JPH07101187A - Manufacture of document capable of being discriminated - Google Patents

Abstract

PURPOSE:To provide a method for manufacture of a document capable of being discriminated which is easy to be manufactured without generating any defect contained in a microwave means. CONSTITUTION:In a method for manufacture of a document capable of being discriminated equipped with a metallic thin film of an individually different shape of its own on a substrate, the metallic thin film is formed by being transferred onto the substrate by heating at random a transfer sheet while the transfer sheet equipped with at least a release layer, a metallic thin film, and a heat fusion weldable adhesive layer is being fixed to a base material by pressure. Therefore, the document capable of being simply discriminated can be obtained, and not a microwave but infrared rays can be used for the obtained document.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an identifiable document used for credit cards, prepaid cards, etc., capable of confirming authenticity.

[0002]

2. Description of the Related Art In recent years, forgery and alteration of various documents such as banknotes, passports, credit cards, bonds, and licenses have become a problem, and a means for checking the authenticity of documents has been socially required.

As a method of identifying the authenticity of a document, Japanese Patent Publication No. 63-501250 proposes an identification method using microwaves. The identification method disclosed in the above-mentioned publication mixes non-conductive materials such as paper and plastic with conductive particles such as conductive fibers to determine the physical characteristics that cause different changes in individual documents with respect to microwaves. It is a method of giving and identifying.

[0004]

However, in the identification method using the microwave means described above, the manufacturing method of the conductive fiber-mixed sheet is complicated, and the dispersibility of the conductive fibers is poor and the particles are easily aggregated. It is difficult to impart physical properties with different and inherent changes. Further, the conductive fiber mixed sheet is weak in strength and difficult to be thinned, so that the thickness of the document is increased, which is not practical.

Moreover, it is difficult to completely seal microwaves by the microwave means, and there is a problem of radio interference due to leaked microwaves. Further, microwave irradiation and detection devices are generally large-scale and expensive.

It is an object of the present invention to provide a method for producing an identifiable document which does not suffer from the drawbacks of the microwave means and which is easy to produce.

[0007]

SUMMARY OF THE INVENTION The gist of the present invention is a method of producing an identifiable document comprising a thin metal film of a different and unique shape on a substrate, the substrate comprising at least a release layer, Manufacture of an identifiable document characterized in that a transfer sheet having a metal thin film and a heat-fusible adhesive layer is pressure-bonded while the transfer sheet is randomly heated to transfer the metal thin film onto the substrate. Is the way. Another gist of the present invention is a method for producing an identifiable document, which comprises metal thin films having different unique shapes on a substrate, wherein a masking layer and a metal layer having a random pattern are sequentially provided on the substrate. Thereafter, the masking layer is removed to form a metal thin film on the substrate, which is a method for producing an identifiable document. Still another subject matter of the present invention is a method for producing an identifiable document comprising a metal thin film having a different unique shape on a substrate, wherein a masking layer and a metal layer having a random pattern are provided on the substrate, and The method for producing an identifiable document is characterized in that a sheet having a metal thin film is formed by removing the masking layer, and then the sheet having the metal thin film is laminated on the substrate.

The identifiable documents referred to in the present invention refer to various documents such as passports, credit cards, bonds, and licenses.

As a method for forming a metal thin film on a substrate using a masking layer, for example, a water-soluble resin is applied in a random pattern on the substrate, and a metal is vapor-deposited to form a metal thin film. The resin is dissolved and removed to form a metal thin film having a random pattern. Further, there is a method in which a net-like net is placed on a substrate, a metal is vapor-deposited to form a metal thin film, and then the net is removed to form a random-patterned metal thin film. In the former case, a water-soluble resin is used as the masking layer, and in the latter case, a mesh net is used as the masking layer.

A method for forming a sheet having a metal thin film using a masking layer is, for example, similar to the method described above, a water-soluble resin or a mesh net is provided as a masking layer on a substrate and a metal is vapor-deposited. Then, the masking layer is removed to form a metal thin film sheet. The sheet having the metal thin film is attached onto a substrate.

The substrate used for the identifiable document is not particularly limited, but paper, polyethylene terephthalate (hereinafter abbreviated as PET) or other plastic material can be used. The metal used for the metal thin film is not particularly limited, but Al, S
n, Ni, Ag, Cu, etc. are preferably used. The method for forming the metal thin film is not particularly limited, but there are vapor deposition method, sputtering method and the like.

The water-soluble resin used in the production method of the present invention is not particularly limited, but natural and semi-synthetic polymers such as starch, starch derivatives, cellulose, cellulose derivatives, alginic acid and gum arabic, polyvinyl alcohol, polyvinyl methyl ether. , Polyvinylpyrrolidone, polyacrylic acid soda, polyacrylic imide, polyethylene oxide and copolymers thereof are suitable.

A method of identifying a document obtained by the manufacturing method of the present invention will be described. Incident light, for example infrared rays, is incident on a predetermined position of the document. Among the infrared rays incident on the document, the infrared ray emitted from the metal thin film portion has a high reflection intensity, but the infrared ray emitted from the non-metal thin film portion has a low reflection intensity. The intensity difference between the former two types of light is detected from above the document as an analog signal depending on the document position.

The incident light has a spot diameter, for example, a diameter of 1-10.
Since the irradiation is performed with a light flux of mm, the intensity difference of the reflected light can be obtained as an average value of the spot areas. Since the shape of the metal thin film is unique for each document, the intensity difference of the reflected light differs for each document, and the obtained analog signal also differs for each document.

A document authenticity determination method will be described. This is performed by providing a recording layer capable of previously recording an analog signal unique to each document, for example, a magnetic layer, and comparing the recorded signal with the analog signal read from the document.

Alternatively, a digital signal obtained by converting an analog signal unique to each document by a certain secret rule is recorded in the recording layer. The signal is recorded by binarizing a response signal for each sub-area when the check area of a document is divided into a large number of sub-areas, or changing it into several hierarchical values. . The width of the sub area is set according to the resolution of infrared rays.

The authenticity check of the document measures the change of the response infrared ray flux and compares the converted digital signal with the digital signal to determine the identity or the closeness of the two. This method can prevent forgery more than the method using the analog signal described above.

[0018]

Embodiments Embodiments will be described below with reference to the drawings, but the present invention is not limited thereto. 1 shows a schematic view of a transfer sheet used in the present invention, FIG. 2 shows a method for producing an identifiable document in which a masking layer is provided on a substrate to form a metal thin film, and FIG. 3 shows a sheet having a metal thin film. A method for producing an identifiable document when it is attached to a substrate will be described.

(Example 1) A method of manufacturing an identifiable document using a transfer sheet will be described. On the polyester film substrate 100 shown in FIG. 1, a release layer 110, an Al metal thin film layer 120, and a heat-fusible adhesive 130 (melting point 115).
C.) was sequentially laminated on a base of a PET film having a magnetic layer and a thickness of 188 μm so that the magnetic layer and the release layer 110 faced each other.

Using a plate having a random concavo-convex pattern, the transfer sheet was thermocompression bonded to the PET film under the conditions of 140 ° C. and 30 Kg / cm ² , and then peeled from the release layer 110 to form a metal thin film having a random pattern. Got the documents with.

By changing the pattern of the plate, the pattern of the metal thin film can have a unique shape which is different for each document. The method of thermocompression bonding is not particularly limited, and for example, there is a method of thermocompression bonding using a thermal head according to a random number pattern.

Example 2 A method for producing an identifiable document obtained by providing a water-soluble resin as a masking layer on a substrate will be described with reference to FIGS. 2 (A) to 2 (C). As shown in FIG. 2A, polyvinyl alcohol is applied in a random pattern to the magnetic layer 21 provided on the substrate of the PET film 20 having a thickness of 188 μm to form the water-soluble resin layer 210, and then Al vapor deposition is performed. The Al thin metal film 2 shown in FIG.
Twenty created.

Further, the water-soluble resin layer 210 was washed away with water to obtain a document having a metal thin film having a random pattern shown in FIG. 2 (C). By changing the pattern when the water-soluble resin is applied, the pattern of the metal thin film can be made to have a unique shape different for each document.

Example 3 A method for producing an identifiable document obtained by using a sheet having a metal thin film is shown in FIG.
This will be described with reference to (E). As shown in FIG. 3B, the water-soluble resin 310 is applied in a random pattern on the PET film substrate 30 shown in FIG. The metal thin film 320 is formed. Further, the water-soluble resin layer 310 is removed by washing with water, as shown in FIG.
A sheet 31 having a randomly patterned metal thin film shown in (D) was obtained.

Substrate 2 made of PET film having a thickness of 188 μm
The above-mentioned sheet 31 was attached to the magnetic layer 21 provided on the upper surface of the sheet 0 by using the adhesive 330 to obtain a document having a random thin metal film shown in FIG. 3 (E). By changing the pattern on which the water-soluble resin is applied when the metal sheet is formed, the pattern of the metal thin film can be made to have a unique shape that is different for each document.

[0026]

As described above, according to the manufacturing method of the present invention, a document that can be easily identified can be obtained, and the obtained document can use infrared rays instead of microwaves.

[Brief description of drawings]

FIG. 1 is a schematic view showing a transfer sheet used in a manufacturing method of the present invention.

FIG. 2 is a schematic diagram showing a process of a production method of the present invention using a water-soluble resin as a masking layer.

FIG. 3 is a schematic view showing a process of the manufacturing method of the present invention using a metal thin film sheet.

[Explanation of symbols]

 110 Release Layer 120 Metal Thin Film 130 Thermal Adhesive Adhesive Layer 20 Base 21 Magnetic Layer 210 Water Soluble Resin 220 Metal Thin Film 310 Water Soluble Resin 320 Metal Thin Film

Claims (3)

[Claims] 1. A method for producing an identifiable document comprising metal thin films each having a unique shape different from each other on a substrate, which comprises at least a release layer, a metal thin film, and a heat-sealable adhesive layer on a substrate. A method for producing an identifiable document, comprising heating a transfer sheet at random while press-bonding the transfer sheet provided with the above to form a metal thin film on the substrate. 2. A method of manufacturing an identifiable document comprising metal thin films each having a unique shape different from each other on a substrate, wherein a masking layer having a random pattern and a metal layer are sequentially provided on the substrate, and then masking is performed. A method of making an identifiable document, which comprises removing a layer to form a thin metal film on the substrate. 3. A method for producing an identifiable document comprising a metal thin film having a unique shape different from each other on a substrate, wherein a masking layer having a random pattern and a metal layer are provided on the substrate.
Further, the method for producing an identifiable document, which comprises forming a sheet having a metal thin film by removing the masking layer and then bonding the sheet having the metal thin film on the substrate.