JPH04145592A - Method for discriminating kind of sheet piece - Google Patents

Abstract

PURPOSE:To improve the security accuracy by coating a kind identification layer of a conductive material with an opaque material or printing or applying paint to the surface of the kind identification layer. CONSTITUTION:A kind identification layer 104 marked with a conductive material having such a property that can reflect or absorb part of projected microwave energy and an opaque-material layer 103 are formed on an opaque sheet substrate 105. The layer 103 may be formed by applying opaque printing ink or paint to the surface of the layer 103 or laminating an opaque film to the surface of the layer 103. Therefore, the security accuracy can be improved, since the information on the kind identification layer cannot be detected without a facility equipped with a microwave projecting detector.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention provides sheet pieces made of non-conductive materials, such as cards, banknotes, securities such as securities, passports, etc. The electrical conductivity of the identification indicia layered on paper or plastic sheet pieces, such as important documents with monetary value, to enable machines to identify the authenticity and type of the sheet pieces. This relates to methods for reading patterns on materials.

(Prior technology) A machine automatically and quickly identifies the authenticity, fakeness, and type of sheet pieces made of non-conductive materials such as paper and plastic, such as cards, banknotes, securities, passports, etc. As a technique to make this possible, a pattern drawn on the surface of the sheet piece using ink, carbon, paint, or some other means is determined by microwave reception signals to determine whether the pattern is correct or not. (For example, Japanese Patent Application Laid-open No. 160133/1983).

Further, a detection method using microwaves is also known, which uses sheet pieces in which metal fibers are randomly distributed and utilizes the fact that the distribution of the metal fibers in each sheet piece is different from sheet to sheet.

These techniques are based on the fact that conductive materials have the property of partially reflecting and absorbing microwaves when they are emitted. When microwaves are projected onto a sheet of non-conductive material, most of the radiation is transmitted and the rest is reflected.

As an identification device for carrying out the identification method, as shown in FIG. 1, a device including a microwave irradiation device and a detector is used. The microwave irradiation detector 102 detects the reflected microwave energy of the irradiated microwave on the type identification layer of the sheet piece 110 that has been conveyed by the conveyance device. Then, the detected data is calculated and compared with a threshold value etc. to determine whether the sheet piece 110 is genuine or not.
Identify the type.

At this time, conventionally, the microwave energy reflected from the microwaves applied to the surface of the sheet piece 110, such as a pattern drawn by printing a conductive material, is detected by the microwave radiation detector 102. Because it can be visually confirmed, the detected data is transmitted to the microwave irradiation detector 10.
2 can be confirmed even without detection, and it is easy to form the same type identification area on a counterfeit non-conductive sheet piece and create a reflection characteristic that is considered to be correct.

(Problems to be Solved by the Invention) In such conventional type identification methods and devices,
Since the pattern for identification can be visually confirmed from the outside without the need to check it with a microwave reception signal, it is easy to form a pattern to identify the same type on a piece of counterfeit non-conductive sheet. .

The present invention provides indicia for type identification purposes in a conductive material in a layer of a sheet piece by covering with an opaque material,
This is a method and apparatus for confirming by projecting microwaves and using microwave reception signals in a state that cannot be confirmed from the outside.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a diagram for marking an opaque sheet-like base material with a conductive material having a property of reflecting and/or absorbing a part of microwave energy applied thereto. By irradiating microwaves onto a sheet piece consisting of a type identification layer with a pattern drawn on it and an opaque material layer formed on the type identification layer, and detecting the reflected microwave energy, the type identification layer is detected. Concerning how to identify types.

The present invention covers a mark made of conductive material for the purpose of type identification by covering it with an opaque material, or by printing or painting the surface, so that it cannot be seen from the outside, and by projecting microwaves, Confirm by microwave reception signal.

The method for identifying authenticity and type according to the present invention provides higher security and accuracy because information on the type identification layer cannot be detected except in equipment equipped with a microwave irradiation detector.

If a non-conductive material with a conductive material layer is covered with an opaque material and inserted into a sheet piece, the microwave energy will be reflected depending on the transferred area density or the transferred pattern. The rest will be transparent. These ratios have specific values depending on the pattern and areal density of the conductive material used for marking.

Types of conductive materials include particles of aluminum, stainless steel, and iron, which are mixed into printing inks or paints and coated and laminated by printing or painting on sheet pieces. Examples of the base material (opaque sheet material) for the sheet piece include paper, polyethylene terephthalate film, polyolefin film, polyimide film, and the like.

As the opaque material layer formed on the type identification layer, an opaque printing ink or paint may be used to form a covering layer, or an opaque film may be laminated.

The printing, painting, or laminating method may be performed by conventionally known printing or the like.

By laminating or printing, the type identification area is covered and cannot be confirmed from the outside.

(Example) The present invention will be explained based on the drawings. The drawings depict one embodiment of the invention. FIG. 1 is a plan view showing an overview of the detection state, and FIG. 2 is a side view.

FIG. 3 shows a sectional view of a sheet piece according to the present invention, and FIG. 4 shows a plan view.

The microwave irradiation detector 102 is disposed facing the passageway 0 of the sheet piece 110 to detect information on the type identification layer.

In order to carry out a method for identifying the type of a sheet piece using a sheet piece in which such a type identification layer is provided in an intermediate layer that is not visible from the outside, the sheet piece 110 is fed into the passage 10 and the sheet piece is Microwave irradiation detector 10 detects the type identification layer of the piece.
Position to the second detection position.

Next, a microwave is projected from the microwave irradiation detector 102, the reflected microwave energy at this time is detected by the microwave irradiation detector 102, the detected value is output to the calculation section, necessary calculations are performed, and the Compare with the value and output a signal as necessary.

[Effects of the Invention] The present invention makes it impossible to check from the outside by covering the conductive material layers with opaque materials by laminating them or forming them into a multilayer structure, or by printing or painting the surfaces. The state of the conductive material can be confirmed using the microwave reception signal, and the authenticity and type can be identified. Therefore, information on the type identification area can be used only in equipment other than equipment equipped with a microwave irradiation detector. Since it cannot be detected, the accuracy is higher for security.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the positional relationship of the microwave irradiation detector in the type identification method, Fig. 2 is a side view showing the positional relationship of the microwave irradiation detector in the type identification method, and Fig. 3 is the present invention. FIG. 4 is a cross-sectional view of the sheet piece, and FIG. 4 is a plan view of the sheet piece. The symbols in the figure are 10... passage 1, 102... microwave irradiation detector, 103... opaque material, 104...
・・Type identification layer marked with conductive material, 105・
... Opaque base material, 110 ... Sheet piece. Patent applicant: Toyo Ink Mfg. Co., Ltd. Drawings Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A pattern or the like for marking purposes is drawn on an opaque sheet-like base material using a conductive material that has the property of reflecting and/or absorbing part of the microwave energy applied to it. A method for identifying the type of the type identification layer by applying microwaves to a type identification layer and a sheet piece formed by forming an opaque material layer on the type identification layer and detecting reflected microwave energy. . 2. The type identification method according to claim 1, wherein the type identification layer is a sheet piece whose surface is printed or painted with an opaque coating. 3. The type identification method according to claim 1, which is a sheet piece obtained by laminating the surface of the type identification layer with an opaque sheet.