JPH06274848A - Information recording medium - Google Patents

Abstract

PURPOSE:To obtain the information only on the fibers consisting of magnetic materials and to obviate forgery and alteration by detecting fibers consisting of nonmagnetic materials as well together with the fibers consisting of the magnetic materials at the time of irradiating the information recording medium with X-rays and detecting the coexisting positions, postures and shapes of the fibers coexisting therein. CONSTITUTION:The region is scanned by using a magnetic head and magnetic flux densities are changed in the positions where the magnetic fibers 3 exist. The changes thereof vary with the distances of the fibers 3 from the scanning plane of a base material 2 and the postures thereof. Electrical analog signals are thereby obtd. and the reading of the information recorded on the information recording medium 1 is possible. A person needs to exactly know the positions and postures of the materials 3 in order to make forgery and alteration in this constitution. Seeing-through the inside by irradiation with X-rays is used as the means thereof and the nonmagnetic fibers 4 are also made to coexist in addition to the materials 3 in order to prevent such forgery or alteration. The fresh detection signals are generated in correspondence to the fiber 4 which are ought not to be detected in such a manner, by which the forgery or alteration is surely prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium, such as a card or securities, which can be confirmed to be real and cannot be tampered with, and which requires a high degree of protection or guarantee. It is about.

[0002]

2. Description of the Related Art Conventionally, as an information recording medium of this kind, fibers made of a magnetic material are arbitrarily mixed inside the medium, and the mixed state of the fibers in a specific area of the medium is recorded information on the medium. (See Japanese Patent Laid-Open No. 50-19999). Then, in such a medium, the set area is scanned by a magnetic head, and a change in magnetic flux density based on a difference in the presence or absence of fibers, a tilt, a distance from the medium surface, or the like is detected. Is reading and checking.

In such a conventional technique, the distribution density and the mixed state of the fibers mixed in the medium change three-dimensionally in the plane direction and the thickness direction of the medium, and the Since the shape of the flow is not constant, even if a plurality of media are manufactured under the same conditions, the fiber distribution density and the mixed state of the media are not exactly the same. Further, once the medium is prepared, the position of each fiber with respect to the medium is immovable, and it is impossible to adjust the movement, addition or removal of the fibers by an external operation. Therefore, the record information determined by the arrangement of the fibers in the medium is automatically added as unique record information at the time of producing the medium, and cannot be tampered with.

[0004]

The above-mentioned proposal makes it possible to provide an original and tamper-proof information recording medium, but the following problems to be solved still remain. There is. That is, in the above-described technique, by using X-rays or the like for the mixed position, posture, shape, etc. of the fibers made of a magnetic material that serves as a recording information holding material,
It can be detected. In this way, the mixed position and orientation of fibers,
Alternatively, when information such as a shape is detected, there is a possibility that the information may be forged or tampered with by some method.

[0005]

The present invention is intended to provide an information recording medium capable of effectively solving the above-mentioned conventional problems. The information recording medium according to claim 1 is made of a non-magnetic material. It is characterized in that fibers made of a magnetic material and fibers made of a non-magnetic material are mixed in an arbitrary dispersed state inside the base material. The information recording medium according to claim 2 has a first base material made of a non-magnetic material and a first base material made of a non-magnetic material and laminated on the first base material. Fibers made of a magnetic material are mixed in an arbitrary dispersed state on one of the base materials, and fibers made of a non-magnetic material are mixed in an arbitrary dispersed state on the other base material. It is characterized by Further, claim 3
The information recording medium described is composed of a fiber made of a magnetic material and a fiber made of a non-magnetic material mixed in an arbitrary dispersed state inside a base material made of a non-magnetic material, and a plurality of the base materials. It is characterized by being integrally laminated.

[0006]

According to the information recording medium of the present invention, when the information recording medium is irradiated with X-rays or the like to detect the mixed position, posture, shape or the like of the fibers mixed therein, a magnetic material serving as an information source. Since the fibers made of non-magnetic material are also detected together with the fibers made of, the detection of only the fibers made of magnetic material is prevented. This further increases the difficulty of counterfeiting and tampering.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 indicates an information recording medium according to this embodiment, and in this embodiment, a card type information recording medium made of resin is illustrated. In this information recording medium 1, a fiber made of a magnetic material (hereinafter,
A schematic structure in which a magnetic fiber 3 and a fiber made of a non-magnetic material (hereinafter referred to as a non-magnetic fiber) 4 are mixed in an arbitrary dispersed state is shown.

More specifically, the base material 2 is formed into a strip shape by extrusion molding so as to have a thickness of 0.01 to 1.00 mm by using a thermoplastic resin such as PET or PVC or paper. After that, it is punched by a press or formed into a predetermined shape by a papermaking process.

The magnetic fiber 3 is made of Fe, Fe-S.
i, Fe-Al, Fe-Si-Al, Fe-Si-B,
Fe-Ni, Fe-Co, Fe-Ni-Co and Fe-S
Various materials and F mainly composed of i binary system and Fe-Ni binary system
e-As, Fe-Sn, Fe-P, etc. are used, the wire diameter is 5 μm to 100 μm, and the length is 1 mm to 100 mm.
Has been made. The magnetic fiber 3 may be magnetized in advance, or may be magnetized after being mixed in the base material 2.

Further, the non-magnetic fiber 4 is made of a non-metal material such as various synthetic fibers or a non-ferrous material having a low magnetic permeability, specifically Te, Sn, In, Al, Bi, Pb,
Zn or the like is used, the wire diameter is 5 μm to 100 μm, and the length is 1 mm to 100 mm. The magnetic fibers 3 and the non-magnetic fibers 4 are mixed in the material of the base material 2 in advance, and are mixed into the material as the material melts during extrusion molding of the base material 2 and extruded. As shown in FIGS. 1 and 3, the resin flows in the base material 2 in a three-dimensional posture as shown in FIGS.

In the information recording medium 1 of the present embodiment thus formed, for example, as shown in FIG. 1, the area of the information recording medium 1 having the width H and the entire length in the long side direction is formed by the magnetic head. By scanning, peculiar record information is detected from the information recording medium 1. That is, when the area is scanned by the magnetic head, the magnetic flux density changes at the position where the magnetic fiber 3 exists. The change depends on the distance of the magnetic fiber 3 from the scanning surface of the base material 2 and the attitude with respect to the magnetic head. Differently, an electric analog signal corresponding to this is obtained, and this is read as the information recorded on the information recording medium 1. For example, for the scanning of the area shown in FIG. 1, the detection signal as shown by the solid line in FIG. 3 is obtained.

The information obtained in this way is
Since it is formed automatically when the base material 2 is molded,
The control is impossible, and therefore, the counterfeiting and tampering are prevented as in the conventional case. On the other hand, in order to perform forgery or falsification, it is necessary to accurately know the position and orientation of the magnetic material 3 in the base material 2, and as a means therefor, there is internal fluoroscopy by X-ray irradiation as described above. However, when the internal perspective of the information recording medium 1 of this embodiment is performed using this means, the non-magnetic fiber 4 is simultaneously detected together with the magnetic material 3 existing in the area, and the magnetic fiber exists as if it were at that position. The detection result is as follows. When the magnetic material 3 is embedded in the base material 2 based on the detection result to manufacture an information recording medium, the magnetic fiber 3 is also positioned at the position of the non-magnetic fiber 4, and as a result, it is forged. When information is read from the information recording medium, as shown by the chain line in FIG. 3, a detection signal corresponding to the non-magnetic fiber 4 that should not be originally detected is newly added, and the genuine information recording medium 1 is added. It is immediately determined that the recorded information is different. As described above, according to the information recording medium 1 in the present embodiment, although the recorded information is read, the forgery and falsification thereof can be surely prevented.

In the above embodiment, the magnetic fiber 3
Although the example in which the nonmagnetic fiber 4 and the non-magnetic fiber 4 are simultaneously mixed in the single base material 2 is shown, the present invention is not limited to this. For example, as shown in FIG. Then 2
An information recording medium in which a base material 2 containing only magnetic fibers 3 and a base material 2 containing only non-magnetic fibers 4 are prepared in advance, and these base materials 2 are integrally laminated. It is also possible to set it to 10. Further, as shown in FIG. 5, a plurality of (two in the illustrated example) information recording media 1 having a structure in which the magnetic fibers 3 and the non-magnetic fibers 4 are mixed as shown in the above-described embodiment are integrally laminated. It is also possible to use the information recording medium 20 configured as described above.

[0014]

As described above, according to the information recording medium of the present invention, the information recording medium is irradiated with X-rays to detect the mixed position, posture, shape, etc. of the fibers mixed therein. In this case, by detecting the fibers made of a magnetic material together with the fibers made of a magnetic material that form the information recording pattern, it is possible to prevent the detection of only the fibers made of the magnetic material and It is possible to prevent the reproduction, and thereby, it is possible to obtain an excellent effect such that the difficulty of forgery or falsification of recorded information can be improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing an information recording medium according to a first aspect of the present invention, showing a state in which magnetic fibers and non-magnetic fibers are mixed.

FIG. 2 is a partial longitudinal sectional view showing the information recording medium according to claim 1 of the present invention, showing a state in which magnetic fibers and non-magnetic fibers are mixed.

FIG. 3 is a waveform chart of a signal obtained when reading information from the information recording medium according to claim 1 of the present invention.

FIG. 4 is a partial longitudinal sectional view showing an information recording medium according to a second aspect of the present invention, showing a state in which magnetic fibers and non-magnetic fibers are mixed.

FIG. 5 is a partial vertical cross-sectional view showing an information recording medium according to a third aspect of the present invention, showing a state in which magnetic fibers and non-magnetic fibers are mixed.

[Explanation of symbols]

 1 Information Recording Medium 2 Base Material 3 Magnetic Fiber 4 Non-Magnetic Fiber 10 Information Recording Medium 20 Information Recording Medium

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location G06K 19/06 G07F 7/08 G11B 5/708 7215-5D 5/80 7303-5D

Claims (3)

[Claims] 1. An information recording medium, wherein fibers made of a magnetic material and fibers made of a nonmagnetic material are mixed in an arbitrary dispersed state inside a base material made of a nonmagnetic material. 2. A first base material made of a non-magnetic material, and a first base material made of a non-magnetic material and laminated on the first base material, and one of these base materials is provided. In which the fibers made of a magnetic material are mixed in an arbitrary dispersed state, and the fibers made of a non-magnetic material are mixed in an arbitrary dispersed state on the other base material. Medium. 3. A fiber made of a magnetic material and fibers made of a non-magnetic material are mixed in a base material made of a non-magnetic material in an arbitrary dispersed state, and a plurality of the base materials are integrally formed. An information recording medium characterized by being laminated.