JPH0732777A - Matter to be checked for genuineness and method and apparatus for checking genuineness of the same - Google Patents

Abstract

PURPOSE:To enhance security and durability by mixing many magnetic polymer elements in a scanning region of a matter to be checked at random, and using an inherent detection signal obtained by magnetically scanning the region for checking genuineness of the matter to be checked. CONSTITUTION:A matter 10 to be checked for genuineness to need to prevent forgery of securities, bank note, ID card, etc., comprises many magnetic polymer elements 12 mixed at random to be directed in directions of an unspecified number of the general public in a base material 1 made of nonmagnetic material such as sheet, plastic, etc. As the element 12, a wirelike element in which a magnetic metal powder 14 made of a high permeability magnetic material, or a high coercive force material is mixed with an element body 13 made of a polymer material such as a known synthetic resin, etc., having flexibility is used. A code display unit 18 provided by enciphering inherent information responsive to a distributed state of the element 12 in a scanning region 17 by a processor is provided in the matter 10 to be checked.

Description

Detailed Description of the Invention

[0001]

This invention relates to important documents, securities, cash vouchers such as banknotes and checks, travelers checks, ID cards, CD cards, credit cards and other cards, passports, art works, boat racing, horse racing, etc. The present invention relates to a detected object whose authenticity is to be checked and whose authenticity is to be checked, such as a public competition voting ticket, etc., and a check method and device thereof.

[0002]

2. Description of the Related Art As a means for checking the authenticity of documents, patent application publication No. 63-501250 (USP 4,820,
No. 912), microwave checking methods and devices are known. In this prior art, a microwave is incident on a large number of metal wires randomly distributed in a document, and a unique digital mark corresponding to the response microwave flux is recorded at an appropriate place on the document according to a certain rule.
When determining the authenticity of the document, the microwave is incident on the document and the response microwave flux is collated with the digital mark. When the two coincide, it is determined that the document is genuine.

[0003]

In the checking means using the microwave as in the above-mentioned prior art, the SN ratio is deteriorated when the response microwave flux is measured because it is easily affected by external noise. Further, since the above-mentioned prior art device oscillates microwaves, it can be considered as a noise source. Moreover, microwave transmitters and receivers are generally large and costly.

Further, when a metal wire is mixed into a thin object to be detected such as paper, the metal wire may be exposed on the surface. If the metal wire is exposed, it will be noticeable in appearance, which is not preferable. Moreover, it becomes an obstacle when printing or coloring the object to be detected, and rust may occur. Also, when the object to be detected is bent, the metal wire may be bent to project onto the surface of the object to be detected, or the code unique to the object to be detected may differ from that at the time of creation of the object to be detected. It may be impossible. These problems are somewhat improved by making the wire diameter of the metal wire smaller, but they cannot be a fundamental solution. Further, thinning the metal wire is not realistic because it not only causes deterioration of the SN ratio but also leads to cost increase.

It is therefore an object of the present invention to provide an object to be detected which has a high SN ratio and a method and apparatus for checking the object, which can avoid the problems found when burying a metal wire.

[0006]

The object to be detected of the present invention developed to achieve the above object comprises a base material made of a non-magnetic material, and a scanning region provided at a specific position of the base material. A plurality of magnetic polymer elements in which magnetic elements are mixed in a flexible element body made of a polymer material, the elements being randomly mixed in the scanning region so as to face an unspecified number of directions; And a code display section which is provided in a part of the material and in which information corresponding to a specific output obtained according to the magnetic polymer element in the scanning area is coded and recorded. Examples of the magnetic metal include Permalloy,
Powders made of magnetically soft, high-permeability magnetic materials such as sendust, Co-based amorphous, and soft ferrite, or for example, ferrite, Sm-Co alloy, N
A powder made of a magnetically hard high coercive force material such as d alloy is suitable.

[0007] An example of the substrate is paper, and the magnetic polymer element together with pulp fibers of the paper may be embedded in the substrate. An example of a polymer material used for the element body of the magnetic polymer element is acrylic resin. In some cases, the magnetic polymer element may be covered with a coating layer having a color similar to that of the base material, if necessary.

The apparatus for checking the authenticity of the object to be detected according to the present invention magnetically scans the magnetic polymer element in the scanning region and captures an output which changes according to the distribution of the magnetic polymer element. Detecting means for obtaining a detection signal peculiar to the detected object, means for obtaining an encrypted code by encrypting the detected signal, code writing means for recording the encrypted code in the code display portion of the detected object, and the code When the reading means for reading the encryption code recorded on the display unit and the encryption code read by the reading means and the detection signal detected by the detection means are collated and the two correspond to each other, the detected object is detected. And a means for judging that is authentic.

[0009]

In the present invention, a large number of the magnetic polymer elements are randomly mixed in the scanning area of the object to be detected in the manufacturing process for manufacturing the object to be detected, and the scanning area is magnetically scanned. The obtained unique detection signal is used for checking the authenticity of the detected object. That is,
While moving the object to be detected at a predetermined speed, the detection means captures a detection signal corresponding to the distribution of the magnetic polymer element in the scanning region. This detection signal has an output pattern specific to each scanning area because it changes for each minute portion of the scanning area depending on the mixing density of the magnetic polymer elements, the size of the magnetic polymer elements, the arrangement direction, and the like. This detection signal is encrypted by a specific rule when the detected object is created and recorded on the code display portion of the detected object.

In the process of verifying whether or not the object to be detected is authentic, the scanning area is rescanned to obtain a detection signal specific to this scanning area, and
The encryption code recorded on the code display portion of the detected object is read, and when the encrypted code corresponds to the detection signal, it is determined that the detected object is authentic.

Since the magnetic polymer element mixed in the object to be detected of the present invention is sufficiently flexible as compared with the metal wire,
Even if the element is bent when mixed with a thin object to be detected, there is no problem that the element projects or breaks on the surface of the object to be detected. Therefore, the detected object can maintain a good surface state, does not rust, and can be printed or colored without problems. Further, it is also possible to prevent the distribution pattern of the elements from changing.

When the base material is paper and the magnetic polymer element is cut into the base material together with the pulp fiber of the paper as in claim 4, the pulp fiber and the magnetic polymer element are three-dimensional. Since the magnetic polymer elements are entangled with each other (three-dimensionally), it is possible to avoid problems such as the magnetic polymer element moving and peeling in the base material, and the magnetic polymer element rising up on the surface of the base material, and the magnetic polymer element has extremely high state stability. With
The detected object has high security.

[0013]

Embodiments of the present invention will be described below with reference to FIGS. As shown in FIG. 2, a large number of magnetic polymer elements 1 are provided in the base material 11 of the object to be detected 10.
2 is randomly mixed so as to face an unspecified number of directions. The base material 11 is made of a non-magnetic material such as paper or plastic. The magnetic polymer element 12 is a wire-shaped element in which a magnetic metal powder 14 is mixed inside an element body 13 made of a polymer material, for example, as in the cross section shown in FIG.

An example of the polymer material used for the element body 13 is polyethylene, polyester, urethane, etc. In short, a well-known synthetic resin having appropriate flexibility can be applied. As the magnetic metal powder 14, a magnetically soft high permeability magnetic material or a magnetically hard high coercive force material is suitable.

As an example of the method for manufacturing the magnetic polymer element 12, a dry manufacturing method using a container 15 having a double structure as shown in FIG. 3 is applied. In this case, the polymer material 13a that has been liquefied by heating to 200 ° C. to 500 ° C. is placed in the outer chamber 15a of the container 15, and the magnetic metal powder 14 is placed in the inner chamber 15b of the container 15. And polymer material 1
Both 3a and the magnetic metal powder 14 are dropped from the nozzle 16 in the lower part of the container 15 or extruded by applying pressure, so that the polymer material 13a is cooled from the nozzle 16 and is cooled and solidified. Metal powder 14 is polymer material 13
It is mixed inside a.

Alternatively, as shown in FIG. 4, a pipe 13b made of a polymer material produced in advance is impregnated with, for example, an alkaline solution 14a containing magnetic metal ions to deposit a magnetic metal on the inner surface 13c of the pipe 13b. Such a wet manufacturing method may be applied.

These magnetic polymer elements 12 are mixed so as to be contained in a specific scanning region 17 at a certain density when the detection object 10 is manufactured. In addition, a non-woven fabric is prepared in advance by the magnetic polymer element 12, and the non-woven fabric is cut into an appropriate size to scan the detection region 1 of the detection object 10.
7 may be buried.

The magnetic polymer element 12 in the illustrated example has a wire shape, but may be a ribbon or a foil. Element 12
The sectional shape of is not limited to a circle, and may be, for example, a polygon, a rectangle, an oval, or the like. The outer diameter D1 (or thickness) of the magnetic polymer element 12 depends on the size of the object to be detected 10, but is, for example, about 5 to 50 μm. The inner diameter D2 of the element body 13 is about 2 to 20 .mu.m. The particle size of the magnetic metal powder 14 is, for example, 1 μm or less, and preferably the average particle size is about 0.2 to 0.3 μm. The mixing ratio of the magnetic metal powder 14 is preferably about 40 to 70% by volume, and it is desirable that the magnetic metal powder 14 be mixed in the central portion of the cross section of the element 12 as much as possible.

A code display section 18 is provided on the detected object 10. The scanning area 17 is provided in the code display portion 18.
The unique information according to the distribution state of the magnetic polymer element 12 in the above is encrypted and written by the processing device 20 described below.

When a high magnetic permeability magnetic material (for example, a magnetically soft metal such as permalloy, Co-based amorphous, sendust, or soft ferrite) is used for the magnetic metal powder 14, the object 10 to be detected is Magnetically scanned by a processor 20 as shown in FIG. The processing device 20 includes a housing 25 and a transfer mechanism 26. The transfer mechanism 26 is configured to move the object to be detected 10 at a constant speed in the direction of arrow F in the figure by a transfer member 27 using a belt, rollers, or the like.

An induction voltage detecting coil pair 33 including an exciting coil 31 and a detecting coil 32 is provided in the middle of the moving path of the object to be detected 10. The excitation coil 31 and the detection coil 32 are provided on the core 41 of the detection head 40. The core 41 is made of a high magnetic permeability alloy material and has a gap 4
Have two.

There is a detector 43 near the gap 42,
The scanning area 17 passes through the detection section 43. A DC power supply circuit 45 for applying a DC bias magnetic field to the core 41 is connected to the exciting coil 31. By passing a current through the exciting coil 31, the core 41
A certain amount of magnetic flux passes through, and part of the bias magnetic field passes through the detection unit 43. Although the coil 32 is adopted as an example of the magnetic detector in the above embodiment, a magnetic detecting element such as a Hall element may be used instead of the coil 32.

The processing device 20 includes a controller 50 using a microcomputer, a code writing unit 51 for recording the following encryption code on the code display unit 18 of the object to be detected 10, and a code display unit 18. A code reading unit 52 for reading the encrypted code is provided. The code writing section 51 and the reading section 52 are connected to a read / write circuit 53. Controller 50
Includes an A / D converter 60, a comparator 61, an encryption code converter 62, and the like. A display 65 is connected to the controller 50.

Next, the operation of the apparatus 20 of the above embodiment will be described. FIG. 6 shows an outline of a process for producing the detected object 10. In step S1, the magnetic polymer element 12 is mixed into the base material 11 when the base material 11 of the object to be detected 10 is manufactured. In step S2, the detected object 10 is moved in the arrow F direction at a predetermined speed by the transfer mechanism 26. This step S2 includes a scanning step S3 and a detecting step S4.

In the scanning step S3, a direct current is passed through the exciting coil 31 by the direct current power supply circuit 45, and a bias magnetic field is applied to the core 41 in advance. Detection unit 4 of core 41
Without the magnetic polymer element 12 in 3, the permeability of the gap 42 remains in its initial state, so the magnetic flux through the core 41 is constant. Therefore, no voltage due to electromagnetic induction is generated in the coil 32, and the voltage output to the controller 50 is substantially zero.

By moving the object 10 to be detected in the direction of arrow F at a predetermined speed by the transfer mechanism 26, the detecting portion 43 is detected.
When the scanning area 17 is passed through, the plurality of minute portions of the scanning area 17 sequentially pass through the detecting section 43. At this time, since the magnetic permeability of the gap 42 changes with time according to the magnetic polymer element 12, the number of magnetic fluxes passing through the core 41 changes. As a result, the electromagnetic induction voltage is generated in the detection coil 32.

The induced voltage is the density, diameter (or thickness), length, direction, magnetic metal powder 14 of the magnetic polymer element 12.
Since the size of the output voltage changes depending on the nature of the output voltage, it is measured as a unique output voltage pattern. In this embodiment, in the detection step S4, the scanning area 17 is divided and detected for each minute time, and the output voltage for each minute time is ranked in a plurality of stages and digitized. In this way, a coded detection signal specific to the scanning area 17 is obtained. In addition, when manufacturing the magnetic polymer element 12,
By intentionally mixing the magnetic metal powder 14 non-uniformly, a wider variety of output patterns can be obtained.

In the encryption step S5, the above-mentioned detection signal is encrypted by the encryption code converter 62 according to a specific rule. The code encrypted in this way is
In the writing step S6, the code is recorded on the code display section 18 by the magnetic head of the code writing section 51. The code display section 18 of this embodiment is a magnetic band, but the code code is displayed on the code display section 18 using a print head, for example.
May be recorded with an optically readable mark and code (for example, a bar code, a two-dimensional bar code, an OCR character, etc.), or a hologram in which the code is recorded may be stamped in order according to an encryption code. Good.

The processing device 20 is also used to check whether the detected object 10 is authentic or not. FIG. 7 shows an outline of the matching process for checking the authenticity of the detected object 10. Step S11 includes a scanning step S3 and a detection step S4 similar to the above-described process of creating the detected object 10. By scanning the scanning region 17 at a predetermined speed, a detection signal corresponding to the magnetic polymer element 12 is generated. obtain.

In the code reading step S12,
The code reading unit 52 reads the encryption code recorded in the code display unit 18. This code is
In the code reproduction step S13, the code for verification is reproduced by being decrypted by the encryption code converter 62 based on a predetermined rule. And a determination step S
14, the collation code and the detection step S4
The detection signal detected in (1) is compared by the comparator 61, and only when the both match, it is determined that the detected object 10 is a genuine product, and the collation result is displayed on the display 65.

According to the processing device 20, the object 10 to be detected is
Since the scanning area 17 can be detected even if the external magnetic field given to the magnetic field is weak, even if the code code or other information is magnetically recorded in the code display portion 18 or other places, the magnetic information is not recorded. There is no destruction. Since the induced voltage detection signal is obtained by the core 41 having the gap 42 and the coil 32, it is unlikely to be affected by external noise.

When a high coercive force material (for example, magnetically hard metal such as ferrite, Sm-Co alloy, Nd alloy) is used for the magnetic metal powder 14 of the magnetic polymer element 12, the magnetic polymer element 12 is used. Since the magnetic flux can be constantly generated from the element 12 by pre-magnetizing, the simplified processing device as shown in FIG. 8 is used when checking the authenticity of the object to be detected 10. It is possible to use 68. In this processing device 68, the DC power supply circuit 45 for generating the bias magnetic field and the coil 31 described in the embodiment (FIG. 5) can be omitted,
The structure is simple.

In any of the above embodiments, the magnetic polymer element 12 used for the object to be detected 10 is extremely flexible and has a high degree of flexibility so that it cannot be bent even when bent. Therefore, even if the object 10 is bent and is mixed in a thin object 10 such as paper, the element 12 does not break and project onto the surface of the object 10. , It does not have any influence on the peculiar pattern when the detected object 10 is created.

Moreover, since the surface of the magnetic polymer element 12 is covered with the element body 13 made of a polymer material, it can be easily colored by a well-known coloring means. Therefore, even if a part of the element 12 is exposed on the surface of the object to be detected 10, there is no problem in printing or coloring so as to be inconspicuous. In particular, when the detected object 10 is made of paper, it is not known from the outside that the element 12 is mixed,
It has high security.

Next, another embodiment of the processing apparatus will be described with reference to the processing apparatus 70 shown in FIG. It should be noted that parts common to those of the processing device 20 of the above-described embodiment are designated by common reference numerals and description thereof will be omitted, and different parts will be described below.

The processing apparatus 70 shown in FIG. 9 includes a first MR element 71 and a second MR element 72, which are examples of a pair of magnetoelectric conversion elements, in the movement path of the object to be detected 10. The magnetic sensor 73 is provided. These MR elements 7
1, 72 are arranged in the moving direction (scanning direction) of the object to be detected 10. The magnetic sensor 73 includes an MR element 71,
Behind 72, a magnet 74 is arranged as an example of a magnetic field generating means. The magnet 74 may be a permanent magnet or an electromagnet using an electromagnetic coil may be used.

The MR elements 71 and 72 are magnetoresistive elements whose electric resistance value changes according to the strength of the magnetic field. Depending on the required specifications, the positive magnetic elements made of compound semiconductors such as indium antimony and gallium arsenide are used. A material having characteristics or a material having negative magnetic characteristics such as a ferromagnetic material such as nickel cobalt or permalloy is used.

These MR elements 71 and 72 are electrically connected to each other, and moreover, the MR elements 71 and 72 are connected to each other.
A magnetic field of the same strength is applied by the magnet 74. Further, the first MR element 71 is connected to the controller 50 via the detection circuit 75. The second MR element 72 is connected to the DC power supply circuit 45. The scanning area 17 is moved along the direction in which the MR elements 71, 72 are arranged.

When the magnetic polymer element 12 passes under the MR elements 71 and 72, the output voltage V changes as the position of the magnetic polymer element 12 changes in the moving direction of the scanning region 17.
_out changes. That is, when the magnetic polymer element 12 does not exist near the MR elements 71 and 72, the magnetic field of the magnet 74 is evenly applied to the MR elements 71 and 72,
Since the resistance values of the MR elements 71 and 72 are equal to each other, the output voltage V _out is about half (V _in / 2) with respect to the input voltage V _in .
Becomes When the magnetic polymer element 12 moves under the MR elements 71, 72 by moving the magnetic polymer element 12 in the direction of the arrow F, the magnetic polymer element 12 passes through the MR elements 71, 72 depending on the position of the magnetic polymer element 12. As the magnetic flux changes with time, and the resistance values of the MR elements 71 and 72 differ, the output voltage V _out rises and falls substantially above (V _in / 2).

Here, the resistance of the first MR element 71 is set to R ₁ ,
When the resistance of the second MR element 72 is R ₂ , the output voltage V
_out is represented by V _out = V _in × {R ₂ / (R ₁ + R ₂ )}. The output voltage V _out changes in size according to the distribution density of the magnetic polymer element 12, the diameter (or thickness), the length, the direction of the magnetic polymer element 12, and the like, so that the output voltage V _out is unique. The pattern is detected.
In this case, the magnetic metal powder 14 is preferably made of a magnetic material having a high magnetic permeability (for example, a magnetically soft metal such as permalloy, Co-based amorphous, sendust, or soft ferrite).

The magnetic polymer element 12 may be a magnetic polymer element 12 shown in FIG. 10, in which magnetic metal powder 14 is mixed in the entire cross section of an element body 13 made of a polymer material. Good. An example of the polymer material used for the element body 13 may be a thermoplastic resin such as polyethylene, polyester or urethane similar to the above-mentioned embodiment, but when the substrate 11 is paper, the element body 13 is preferably an acrylic resin. There is. The mixing amount of the magnetic metal powder 14 is 30 wt% ~
A range of 80 wt% is preferred. If it is less than 30 wt%, the output by the magnetic metal powder 14 may not reach the practical level, and if it exceeds 80 wt%, the strength (mainly tensile strength) of the element 12 is remarkably reduced and it cannot be put to practical use.

As shown in FIG. 11, the magnetic polymer element 12 is embedded in the base material 11 together with the pulp fibers 80 of the paper base material 11. The step of scooping the magnetic polymer element 12 into the pulp fiber 80 can be carried out without any problem by a normal paper pulp manufacturing process. When the pulp fiber 80 and the magnetic polymer element 12 are thus squeezed together, the pulp fiber 80 and the magnetic polymer element 12 are entangled three-dimensionally (three-dimensionally), so that the magnetic polymer element 12 is a base material. Since it is possible to avoid problems such as movement in 11 and peeling, magnetic polymer element 12 rising up on the surface of substrate 11, magnetic polymer element 12 has extremely high state stability. In addition, the magnetic polymer element 1
Since 2 is three-dimensionally intertwined with pulp fiber 80, forgery is difficult and security is improved.

The magnetic polymer element 12 can be manufactured using the manufacturing apparatus 90 shown in FIG. The manufacturing apparatus 90 includes an acrylic solution supply unit 92 having a nozzle 91 for ejecting an acrylic solution, a solution tank 94 containing a coagulating solution 93, and the like. As shown in an enlarged scale in FIG. 13, an acrylic solution 9 containing a large number of magnetic metal powders 14 is mixed.
By drawing 5 out of the nozzle 91 and passing it through the coagulation solution 93, the magnetic polymer element 12 in which a large number of magnetic metal powders 14 are mixed inside the acrylic element body 13 is obtained. This magnetic polymer element 12 is, for example, 2 mm to 10 mm.
Cut to length.

The cross-sectional shape of the magnetic polymer element 12 is not limited to a circle, but the opening cross section of the nozzle 91 may be rectangular so that a magnetic polymer element having a rectangular cross section or a polygonal cross section is manufactured. Good. The flat shape of the magnetic polymer element 12 is advantageous in mixing the element 12 when the base material 11 is thin.

Moreover, when acrylic resin is used for the element body 13 of the magnetic polymer element 12, since the specific gravity of the magnetic polymer element 12 is close to that of the pulp fiber 80, the pulp fiber 80 and the magnetic polymer element 12 are in a pulp solution. It is well mixed inside, and when the surface of the acrylic resin (the surface of the magnetic polymer element 12) is viewed under a microscope, innumerable small projections are swelled up.
The entanglement between 2 and the pulp fiber 80 becomes extremely strong. In addition, in the case of the conventional metal magnetic wire, since the wire is likely to accumulate under the pulp solution, it is difficult to mix with the pulp fiber. Further, since the conventional metal magnetic wire has a smooth surface, it has a poor bite to pulp fibers.

The magnetic polymer element 12 shown in FIG.
As described above, the base material 1 is provided on the entire outer circumference of the element 12.
You may make it coat with the coating layer 98 of the same color as 1. As an example of the coating layer 98, when the base material 11 is white, a white material in which a polymer material contains titanium oxide 99 is used. When the base material 11 is brown, the coating layer 98 may be brown.

In the magnetic polymer element 12 provided with the coating layer 98 as described above, as shown in FIG. 15, the magnetic metal powder 14 is mixed by the acrylic solution supply section 111 using the nozzle 110 having a double structure. Acrylic solution 95
Is coated with a polymer solution 112 containing titanium oxide 99 and is passed through a coagulating solution 93 (see FIG. 12).

The length of the magnetic polymer element 12 is 2 mm.
The range from 1 to 10 mm is preferred. If it is less than 2 mm, the elements 12 become too fine and are evenly dispersed like powder in the base material 11. Therefore, in the current processing devices 20 and 70, the output is uniform and random as shown in FIG. The features are hard to come out. When the length is, for example, 5 mm, the output tends to have a characteristic as shown in FIG. If the length of the element 12 exceeds 10 mm, it becomes difficult for the element 12 to mix with the pulp fibers in the pulp solution, and it is difficult to scrape the magnetic polymer element 12 in the current papermaking technology.

The wire diameter of the magnetic polymer element 12 is 10
It is preferably between 100 μm and 100 μm. As shown in FIG. 18, if the wire diameter is 10 μm or more, a practical level output can be obtained as long as the content of the magnetic metal powder 14 is sufficient. The larger the wire diameter, the larger the output, which is preferable.
When the thickness of the paper as the base material 11 is about 100 μm and the wire diameter of the element 12 exceeds 100 μm, part of the element 12 is exposed on the surface of the base material 11, which is not preferable. That is, the wire diameter needs to be equal to or less than the thickness of the base material 11.

The present invention can also be proved to be authentic by embedding the magnetic polymer element 12 on the back surface of the canvas of the painting and recording the code in the code display section. In addition, the present invention is useful for distinguishing the imitation from the genuine object by embedding the magnetic polymer element 12 in a three-dimensional object such as a work of art.

[0051]

EFFECTS OF THE INVENTION According to the present invention, even if the object to be detected is bent, there is no problem such as the element protruding or breaking on the surface of the object to be detected, and a good surface suitable for printing or coloring. The state is obtained, and there is no problem that the distribution pattern of the element changes. Further, it is possible to avoid the occurrence of rust. Since the present invention magnetically detects the magnetic polymer element mixed in the scanning region, noise generation from the device is avoided and the SN ratio is high as compared with the checking means using microwaves.

When the magnetic polymer element is rubbed together with the pulp fiber of the paper, the pulp fiber and the magnetic polymer element are sufficiently entangled three-dimensionally, so that the magnetic polymer element and the substrate are highly integrated. Things are obtained. In this case, the magnetic polymer element may move or peel off in the substrate,
This makes it possible to avoid problems such as fluffing on the surface of the base material, making it an object with high durability and security. In addition, it is possible to cut into a predetermined size, print or write with a writing instrument such as a pen, and an object to be detected having a wide range of applications can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a magnetic polymer element used for an object to be detected according to an embodiment of the present invention.

FIG. 2 is a plan view conceptually showing an example of an object to be detected.

FIG. 3 is a sectional view showing an outline of an apparatus for manufacturing the magnetic polymer element shown in FIG.

FIG. 4 is a sectional view showing another example of an apparatus for producing a magnetic polymer element.

FIG. 5 is a side view showing a partial cross-section of a processing apparatus showing an embodiment of the present invention.

FIG. 6 is a flowchart showing steps of processing when creating an object to be detected.

FIG. 7 is a flowchart showing steps of a process for collating an object to be detected.

FIG. 8 is a side view showing a partial cross-section of a processing apparatus showing another embodiment of the present invention.

FIG. 9 is a side view showing a schematic partial cross-section of still another embodiment of the processing apparatus.

FIG. 10 is a cross-sectional view showing another embodiment of the magnetic polymer element used for the object to be detected.

FIG. 11 is an enlarged view of a part of the object to be detected when the magnetic polymer element is rubbed into the paper.

FIG. 12 is a sectional view showing an example of an apparatus for manufacturing a magnetic polymer element using acrylic.

13 is an enlarged cross-sectional view showing a part of the device shown in FIG.

FIG. 14 is a cross-sectional view when a coating layer is provided on the magnetic polymer element.

FIG. 15 is a sectional view showing a part of an apparatus for manufacturing the magnetic polymer device shown in FIG.

FIG. 16 is a diagram showing the output when the length of the magnetic polymer element is less than 2 mm.

FIG. 17 is a diagram showing the output when the length of the magnetic polymer element is 5 mm.

FIG. 18 is a diagram showing the relationship between the wire diameter of a magnetic polymer element and the output.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Detected object 11 ... Base material 12 ... Magnetic polymer element 13 ... Element main body 14 ... Magnetic metal powder 17 ... Scan area 18 ... Code display part 20 ... Processing device 32 ... Detection coil 50 ... Controller 51 ... Code writing part 52 ... Code reading unit 70 ... Processing device 80 ... Pulp fiber 98 ... Coating layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masumi Yoda 3-10, Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Japan Article Co., Ltd. (72) Minor Komiya 3-10, Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Within the corporation

Claims (9)

[Claims] 1. A base material made of a non-magnetic material, a scanning region provided at a specific position of the base material, and an element randomly mixed in the scanning region so as to face an unspecified number of directions. And a large number of magnetic polymer elements containing a magnetic metal in a flexible element body made of a polymer material, and a unique magnetic element provided on a part of the base material and obtained according to the magnetic polymer element in the scanning region. And a code display section in which information corresponding to the output of the above is coded and recorded. 2. The object to be detected according to claim 1, wherein the magnetic metal is powder of a magnetically soft high-permeability magnetic material. 3. The object to be detected according to claim 1, wherein the magnetic metal is powder of a magnetically hard high coercive force material. 4. The object to be detected according to claim 1, wherein the base material is paper, and the magnetic polymer element is embedded in the base material together with pulp fibers of the paper. . 5. The object to be detected according to claim 4, wherein the polymer material of the element body of the magnetic polymer element is acrylic resin. 6. The object to be detected according to claim 4, wherein the outer surface of the magnetic polymer element is entirely covered with a coating layer of a color similar to that of the base material. 7. The object to be detected according to claim 6, wherein the coating layer is a white coating layer in which a polymer material contains titanium oxide. 8. A substrate having a base material made of a non-magnetic material, a large number of magnetic polymer elements in which an element main body made of a polymer material contains a magnetic metal, and a scanning region in which the magnetic polymer elements are randomly mixed. A method for checking the authenticity of a detected object, comprising a creating process for creating the detected object, and a matching process for checking the detected object, the creating process comprising: Scanning step for magnetically scanning the magnetic polymer element in the area, and detection step for obtaining a detection signal specific to the object to be detected by capturing the output that changes according to the distribution of the magnetic polymer element when scanning the scanning area And a step of obtaining an encryption code by encrypting the detection signal, and a step of recording the encryption code on the code display portion of the detected object. The matching process is unique to the object to be detected by capturing a scanning step of magnetically scanning the magnetic polymer element in the scanning area and an output that changes according to the distribution of the magnetic polymer element when scanning the scanning area. Detection step for obtaining the detection signal of the above, a code reading step for reading the code code recorded on the code display section, and the detected object is authentic when the code code corresponds to the detection signal detected in the detection step. A method for checking the authenticity of an object to be detected, comprising the step of determining that 9. A base material made of a non-magnetic material, a large number of magnetic polymer elements in which an element body made of a polymer material contains a magnetic metal made of a high coercive force material or a magnetic material having a high magnetic permeability, and the magnetic polymer. A device for checking the authenticity of an object to be detected having a scanning area in which elements are randomly mixed, wherein the magnetic polymer element in the scanning area is magnetically scanned and according to the distribution of the magnetic polymer element. Detecting means for obtaining a detection signal peculiar to this detected object by capturing the changing output,
Means for obtaining an encryption code by encrypting the detection signal, code writing means for recording the encryption code on the code display portion of the detected object, and reading for reading the encryption code recorded on the code display portion. And means for collating the encryption code read by the reading means with the detection signal detected by the detecting means and determining that the detected object is authentic when the two correspond to each other. A device for checking the authenticity of a characteristic detected object.