JP4158914B2 - Material discrimination device and material discrimination method for sheet-like object to be measured - Google Patents

Description

  The present invention relates to a material discrimination device and a material discrimination method for a sheet-like object to be measured.

Conventionally, according to the invention of measuring using a capacitance sensor for identification as a method for identifying printed matter and paper sheets, a capacitor unit is configured by a detection electrode and an installation electrode in the passage path of the paper sheet, and the paper It is described that the number of leaves can be checked and the presence / absence check of a safety thread embedded in a paper sheet can be checked (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 9-237362

  According to the above-mentioned patent document 1, if measurement is performed using a capacitance sensor for identification, a large detection voltage can be obtained in the safety sled and OVD portions, and a small detection voltage can be obtained in printing and paper portions other than the safety sled. Yes. However, the detected voltage waveform shows only the level of voltage of the unitary voltage and has not reached the recognition of the material of the object to be measured. It is difficult to completely eliminate the counterfeit paper sheets that are pasted.

Moreover, since each of the dielectric and the conductor is separately measured by one sensor, it takes a long time to measure and increases the cost.

On the other hand, the apparatus of the present invention can determine a dielectric, a conductor, and even a composite material using a common apparatus with a single apparatus. Can be reduced.

Further, the composite material could not be discriminated conventionally, but according to the apparatus of the present invention, even the composite material can be easily identified by conveying the sheet.

The material discrimination method of the sheet-like object to be measured according to the present invention is a method for discriminating the material of the sheet-like object to be measured using an apparatus including a waveguide, an irradiation unit, a receiving unit, and a collation / discrimination unit, On the leakage hole of the waveguide having at least one leakage hole, the sheet surface of the sheet-like object to be measured is disposed facing the electromagnetic wave into the waveguide by the irradiation means, The electromagnetic wave irradiated by the receiving means propagates in the waveguide, is emitted to the outside from the leakage hole, and passes through the sheet-like object to be measured. The electromagnetic wave changes, the electromagnetic wave change is received as information on the specific electromagnetic wave change of the material of the sheet-like object to be measured, and the electromagnetic wave information received by the collation / discrimination means and the material specific as a discrimination reference Compare and illuminate To, by recognizing whether the electromagnetic wave varies corresponding to the electromagnetic wave information of any of the material, is characterized in that discriminates the material of the sheet-like object to be measured.

According to another aspect of the present invention, there is provided a method for discriminating a material of a sheet-like object by using an apparatus including a waveguide, an irradiation unit, a receiving unit, a collation / discrimination unit, and a conveying unit. The electromagnetic wave is radiated into the waveguide by the irradiation means, and the leakage hole of the waveguide has a sheet-like object to be measured having at least one leakage hole by the conveying means. The electromagnetic wave radiated by the receiving means propagates in the waveguide, is emitted to the outside from the leak hole, is transported, and passes over the leak hole. The electromagnetic wave in the waveguide is changed, and the change in the electromagnetic wave is received as information on the specific electromagnetic wave change in the material of the sheet-like object to be measured. , Received by the collation / discrimination means By comparing and collating the electromagnetic wave information with the electromagnetic wave information specific to the material serving as a discrimination criterion, and recognizing which material the electromagnetic wave information corresponds to the electromagnetic wave information of the material, The material is discriminated.

  The sheet-like object to be measured is compared with the first detection voltage before the sheet-like object to be measured arrives on the leakage hole of the waveguide having at least one leakage hole. When the second detection voltage when moving onto the leakage hole is lower than the first detection voltage, as the sheet-like object passes over the leakage hole, the voltage gradually decreases. Is determined as a dielectric material, and when the voltage gradually increases and is higher than the first detection voltage, it is determined as a conductor material, and in the process in which the sheet-shaped object to be measured passes, When the voltage gradually increases and becomes lower than the first detection voltage, and when the sheet-like object to be measured completely covers the leakage hole, the voltage rises above the first detection voltage, It is determined that it is composed of body material and conductor material, A material determining method for a sheet-like object to be measured, characterized in that to determine the material of the serial sheet under test.

The material information of the sheet-like object to be measured determined by the collating / discriminating means is recorded, and the electromagnetic wave information of the material over the length of the recorded sheet-like object to be measured by the determining means, and the discrimination criterion A method for determining the material of a sheet-like object to be measured, comprising: comparing and collating with electromagnetic wave information of a material over the length of the sheet-like object to be measured, and determining the sheet-like object to be measured. .

The electromagnetic wave is a material discrimination method for a sheet-like object to be measured, which is a microwave.

The shape of the leak hole is a material discrimination method for a sheet-like object to be measured, which is a geometric shape.

A material discrimination device for a sheet-like object to be measured according to the present invention is a material discrimination device that discriminates a sheet-like object to be measured, which includes a conveyance unit, a measurement unit, and a collation / discrimination unit, and the conveyance unit includes: Means comprising a means for moving a sheet-like object to be measured relative to the waveguide, and the measurement unit includes a waveguide having at least one leakage hole, and an electromagnetic wave in the waveguide. Irradiating means, and the irradiated electromagnetic wave propagates in the waveguide, is emitted to the outside from the leakage hole, and passes through the sheet-like object to be measured conveyed by the conveying unit, thereby The electromagnetic wave in the waveguide is changed, and the means for receiving the change of the electromagnetic wave as information on the specific electromagnetic wave change of the material of the sheet-like object to be measured is provided. Verification showing changes in electromagnetic wave for each material A means for recording using data, and a comparison / collation of information on electromagnetic wave changes obtained when measuring the sheet-like object to be measured by the measurement unit and the collation data recorded on the recording means And a collating means for discriminating the material of the sheet-like object to be measured.

  In the present invention, one or more electromagnetic wave leakage holes are arranged on the wall surface of the waveguide, electromagnetic waves are irradiated into the waveguide to leak an electromagnetic field from each leakage hole, and an object to be measured enters the leakage hole. It is possible to stably determine the material of the sheet-like object to be measured by arranging and measuring the base material or the laminate.

Furthermore, since it is possible to discriminate dielectrics, conductors, and composite materials thereof using a common device, operation time is reduced and costs are also reduced.

For example, even when different materials are layered on a predetermined position or the whole of paper, sheets, printed matter, cards, etc., the dielectric constant can be reduced by scanning using the material discriminating means of the present invention. Changes in electromagnetic waves due to dielectric constant in large areas, changes in electromagnetic waves due to electrical conductivity in areas where electrical conductivity is large, and changes in electromagnetic waves due to both in areas where layers with high dielectric constant and layers with high electrical conductivity are stacked Therefore, it is possible to stably determine the material of the sheet-like object to be measured.

In the present invention, the sheet-like object to be measured is, for example, a base material such as paper, plastic, rubber, or resin, and printing, coating, vapor deposition, sticking, or base material is performed on a predetermined position or the whole of these base materials. It is a laminate that has been layered by a method such as embedding into a substrate or sandwiching it between substrates.

Next, embodiments of the present invention will be described below with reference to the drawings.
(Description of principle)
The principle of determining the material of the sheet-like object to be measured by the leakage electromagnetic field will be described with reference to the drawings. The electromagnetic wave described in the present invention means an electromagnetic wave exceeding the frequency 3 kHz specified in the Radio Law and not exceeding 30 THz. For example, a microwave having a frequency in the range of 1 GHz to 300 GHz is preferable.

FIG. 1 shows the overall configuration of an apparatus for determining the material of a sheet-like object to be measured by a leakage electromagnetic field. The measurement unit 34 includes a waveguide 3, an irradiation unit 31 that radiates electromagnetic waves into the waveguide, a reception unit 32, and a waveguide wall surface that emits electromagnetic waves propagating through the waveguide to the outside. The leakage hole 2 is disposed in the main body and is the main hardware for measuring the sheet-like object to be measured.

The collating / discriminating unit 33 collates the material information recording unit 28 that stores information on electromagnetic wave changes of various materials, and the obtained electromagnetic wave changes and the electromagnetic wave information of various materials recorded in the material information recording unit 28. The collating unit 29 for recognizing a similar material is the main software for discriminating the material of the sheet-like object to be measured.

The conveyance unit 35 conveys a sheet-like object to be measured, and the operator may measure the sheet-like object to be measured while moving the sheet-like object to be measured, or may automatically convey the object.

Next, main principles of the present embodiment will be described with reference to FIGS.
In FIG. 2 (a), a leakage hole 2 for leaking electromagnetic waves 1 is arranged on the upper wall surface of the waveguide 3, and the electromagnetic waves 1 are irradiated into the waveguide 3 from an electromagnetic wave oscillation source. The TE10 mode electromagnetic wave distribution is obtained in the tube. 2 (b) shows the magnetic field distribution 5 of the magnetic field in the waveguide and the magnetic field leaking from the leakage hole 2, and FIG. 2 (c) shows the electric field distribution 6 of the electric field in the waveguide and the electric field leaking from the leakage hole 2. Show. FIG. 2 (d) shows a state in which the object to be measured 4 is placed on the leakage hole 2 so as to face each other, and when the leakage electromagnetic field is transmitted through the object to be measured 4, the material characteristics of the object to be measured 4 The principle is that the magnetic field distribution 5 and the electric field distribution 6 change.

In this case, when a portion having a large dielectric constant such as paper or resin comes to the leakage hole 2, the amplitude and phase of the standing wave generated by the synthesis of the electromagnetic wave opposite to the electromagnetic wave traveling in the waveguide 3 changes. In addition, when a highly conductive portion such as a metal vapor deposition film or a crystal film comes to the leak hole 2, the inside of the waveguide 3 becomes a cavity resonance state, and the amplitude and phase of the electromagnetic field change. In other words, the detected voltage waveform obtained by the measurement shows a waveform shape that combines the change due to the dielectric constant and the change due to the conductivity, so whether the measured material is a dielectric from the measured waveform, It is possible to know whether it is a conductor or whether a dielectric and a conductor are stacked.

In addition, although the preferable shape which the leak hole 2 can take was shown in FIG.2 (e)-(h), it should just be a geometric shape not only this. (e) is a circular hole, (f) is an elongated hole in the waveguide width direction, (g) is a rectangular hole, and (h) is a cross-shaped hole. In particular, the cross-shaped hole of (h) can finely adjust the leaked electromagnetic field to a desired amount if the dimensions in the waveguide axis direction and the width direction are designed as desired.

  FIG. 3A shows the object to be measured 4 of the PET film layer 7 having a thickness of 100 μm, and FIG. 3B shows the object to be measured, for example, using aluminum for the PET film layer 7 having a thickness of 100 μm. The DUT 4 to which the metal vapor deposition layer 8 having a thickness of 500 mm is applied is shown.

In the present embodiment, the measurement object 4 of FIG. 3 is placed opposite to the apparatus of FIG. 2A, and measurement is performed in a stationary state, and the measurement object 4 is moved relatively. Possible to measure.
A case where the measurement object 4 is relatively moved and measured will be described.
FIG. 4 shows a state where the device under test 4 of FIG. 3 is moved relative to the apparatus of FIG. FIG. 4A shows a state immediately before the DUT 4 and the leakage hole 2 overlap, and the detection voltage at this time is the first voltage (this level is considered as the zero reference of the detection voltage). FIG. 4B shows a state in which the degree of overlap is progressing, and the detection voltage at this time is the second voltage. FIG. 4C shows a state in which they are completely overlapped, and the detection voltage at this time is a third voltage.

FIGS. 5A, 5B, and 5C show three classifications of detected voltage waveforms obtained when various objects to be measured 4 are measured in the order shown in FIG.

In the waveform shape of FIG. 5A, as the DUT 4 passes through the leak hole 2, the voltage drops from the first voltage that is the zero reference to the third voltage. The reason for this curve is that, since the DUT 4 is composed of the PET film layer 7, the detection voltage is lowered based on the dielectric constant. Thus, when the DUT 4 is a dielectric material, the first voltage> the third voltage.

In the waveform shape of FIG. 5 (b), as the DUT 4 passes through the leakage hole 2, it drops from the first voltage, which is zero reference, to the second voltage, and then from the second voltage. It exceeds the first voltage and rises to the third voltage. The reason for this curve is that since the DUT 4 is composed of the PET film layer 7 and the metal vapor-deposited layer 8, the second voltage drops based on the dielectric constant of PET, and the third voltage is conductive. The high voltage metal layer closes the leak hole and the waveguide is closed, and the internal voltage approaches the cavity resonance state, and the detection voltage is increased. Thus, when the DUT 4 is a composite material of a dielectric material and a conductive material, the first voltage> the second voltage and the first voltage <the third voltage are shown. . Even if the configuration of the object to be measured is reversed, a similar curve is obtained.

In the waveform shape of FIG. 5C, as the DUT 4 passes through the leakage hole 2, it rises from the first voltage that is the zero reference to the third voltage. The reason for this curve is that, since the DUT 4 is composed of the aluminum foil 8, the detection voltage has increased based on its conductivity. Thus, when the DUT 4 is a conductive material, the first voltage <the third voltage.

In addition, although the case where the object to be measured 4 is relatively moved and measured has been described with reference to FIGS. 4 and 5, the object to be measured 4 may be automatically moved using the transfer device, but may be moved by hand without using the transfer device. You may let them.

On the other hand, a case where the measurement object 4 is placed facing each other and measured in a stationary state will be described.
FIG. 6 shows a state in which the DUT 4 of FIG. 3 is measured in a stationary state with respect to the apparatus of FIG. FIG. 6A shows a state in which the DUT 4 is not on the leak hole 2, and the detection voltage at this time is the first voltage (this level is considered as the zero reference of the detection voltage). FIG. 6B shows a state in which the object to be measured 4 is placed on the leakage hole 3 without scanning, and the detection voltage at this time is the second voltage.

7A, 7B, and 7C are three classifications of detected voltages obtained when various objects to be measured 4 are measured in the order shown in FIG. As described above, when the DUT 4 is moved, the curve as shown in FIG. 5 is shown. However, in the case of FIG. 6 in which the measurement is performed in a stationary state, as shown in FIG. The voltage is obtained.

In the case of FIG. 7A, since the DUT 4 is constituted by the PET film layer 7, the second voltage is a negative voltage based on the dielectric constant. As described above, when the DUT 4 is a dielectric material, the first voltage> the second voltage.

In the case of FIG. 7B, the DUT 4 is composed of the PET film layer 7 and the metal vapor deposition layer 8, but the DUT 4 is placed on the leakage hole 3 without moving relatively. As a result of the measurement, the second voltage did not show a negative voltage due to the dielectric constant of PET, but showed only a positive voltage due to a metal layer having high conductivity. As described above, when the measurement object 4 performs the measurement without conveying the composite material of the dielectric material and the conductive material, the first voltage <the second voltage is shown.

In the case of FIG. 7C, since the DUT 4 is made of the aluminum foil 8, the second voltage is a positive voltage based on its conductivity. As described above, when the DUT 4 is a dielectric material, the first voltage <the second voltage is shown.

FIG. 8A shows a state in which the dimension of the leakage hole 2 is increased in the width direction with respect to the waveguide axis direction, and FIG. 8B shows that the waveguide axis direction is fixed to 2 mm. The detected voltage value when the fine paper is measured while changing the width direction is shown. As a result, the detection voltage increased as the width dimension increased.

Further, FIG. 8C shows that the dimension of the leakage hole 2 is 2 mm in the waveguide axial direction and 4.5 mm in the width direction, which is ½ of the wavelength of the electromagnetic wave 1 passing through the waveguide in the axial direction. As a result of measuring the quality paper by disposing two papers separated by a corresponding distance, a detection voltage approximately twice that of the single paper shown in FIG. 8A is obtained.

(Explanation of the device)
Next, the apparatus will be described with reference to the drawings.
FIG. 9 shows three examples of a material discriminating apparatus that uses a leakage electromagnetic field. The example of FIG. 9A is a microwave reception unit 13 including a transmission antenna 9 and a transmission diode 10 such as a Gunn diode, and a microwave reception unit 12 including a reception antenna 11 and a reception diode 12 such as a Schottky diode. This is an apparatus constituted by a section 14, a waveguide 3 having an upper wall surface provided with a leakage hole 2, and a non-reflection terminator 15 capable of absorbing the power of electromagnetic waves.

When a TE10 mode electromagnetic wave is irradiated from the transmitting diode 10 through the transmitting antenna 9 into the waveguide, a part of the electromagnetic field leaks to the outside from the leakage hole 2, and the DUT 4 is placed on the leakage hole 2. Then, as shown in FIG. 2 (d), the electromagnetic field passes through the DUT 4, and the amplitude or phase of the electromagnetic wave in the waveguide changes depending on the material characteristics. This is changed by the receiving diode 12 through the receiving antenna 11. It detects and discriminate | determines the material of a to-be-measured object from the variation | change_quantity.

In adjusting the apparatus, the positions of the leakage hole 2 and the non-reflecting terminator 15 are arranged with respect to the microwave transmission unit 13 so that the electromagnetic wave in the waveguide can be most leaked from the leakage hole 2. The position of the non-reflecting terminator 15 needs to be adjusted so that when the leak hole 2 is closed with a conductor, the inside of the waveguide is in a cavity resonance state in order to enable measurement based on conductivity. There is.

In the example of FIG. 9B, the non-reflection terminator 15 shown in FIG. The adjustment of the device is functional except that the position of the leak hole 2 and the reflector 16 is arranged with respect to the microwave transmitter 13 so that the electromagnetic wave 1 in the waveguide can be most leaked from the leak hole 2. Is the same as 9 (a).

In the example of FIG. 9C, the microwave transmission unit 13 and the microwave reception unit 14 are provided on one side of the waveguide 3 in FIG. This is an apparatus having a configuration in which a wave transmitter 13 and a microwave receiver 14 are provided. The device is adjusted so that the electromagnetic wave 1 in the waveguide can be most leaked from the leak hole 2, and when the leak hole 2 is covered with a conductor, the inside of the waveguide is in a cavity resonance state. 9B is functionally the same as FIG. 9B except that the positions of the leakage hole 2 and the microwave receiving unit 14 are arranged with respect to the unit 13.

In the following embodiments, a microwave module 19 used for an automatic door or a speed sensor is used as a component combining the microwave transmitter 13 and the microwave receiver 14. This microwave module 19 is provided with a transmitting diode 10, a transmitting antenna 9, a receiving diode 12, and a receiving antenna 11 in an EIA standard rectangular waveguide WR42 type, and 24.15 GHz electromagnetic wave in TE10 mode. It is a module that can transmit and receive.

In addition, as a device having another configuration, an oscillation device using a magnetron instead of a transmission diode is adopted for the microwave transmission unit 13, or a microwave probe is used for the microwave reception unit 14 instead of a reception diode. For example, it may be a precise configuration circuit constructed using high-performance waveguide parts.

Further, although embodiments to which the present invention can be preferably applied are shown, the embodiments of the present invention are limited by these embodiments with respect to the frequency of electromagnetic waves, the mode of electromagnetic waves, leakage holes (size, shape, number, position, etc.), etc. It is not something.

FIG. 10 shows the configuration of the first embodiment of the present invention. The material discrimination device for a sheet-like object to be measured according to the present invention is mounted on a transport device, and the printed matter and cards are relatively moved to judge authenticity.

A material discrimination device for a sheet-like object to be measured according to the first embodiment includes a microwave module 19, a waveguide 3, a reflecting plate 16, an irradiation unit 31, a measurement unit 34 including a reception unit 32, a material information recording unit 28, A collation / discrimination unit 33 including a collation unit 29 and a result display unit 23 are provided. Specifically, the irradiation unit 31 includes a transmission power source unit 17 and a microwave transmission unit 13, and the reception unit 32 is a microwave reception unit. 14, an amplification unit 18, a negative voltage adjustment unit 20, and a positive voltage adjustment unit 21.

The position of the reflector 16 is arranged at a position where the inside of the waveguide 3 becomes a cavity resonance state when the microwave module 19 is oscillated with the leakage hole closed, that is, 65 mm from the left end of the waveguide. did. The leakage hole 2 is a long hole having a diameter of 2 mm and a length of 4.5 mm, and is disposed at a position where a large electromagnetic field can be leaked from the leakage hole 2, that is, at a position 29 mm from the left end of the waveguide 3.

The amplification unit 18 amplifies the detection voltage from the microwave module 19, and in that case, the negative voltage is output when the amplitude of the detection voltage is a dielectric, and the positive voltage is output when the detection voltage is a conductor. The voltage adjustment unit 20 and the positive electrode voltage adjustment unit 21 are set in advance.

In the material information recording unit 28, when measuring paper, PET film, and aluminum vapor deposition, information on electromagnetic waves unique to various materials is stored in advance in an information recording medium (memory, ROM, RAM, etc.). . The electromagnetic wave information that is unique to each material refers to an estimated value that the electromagnetic wave changes when each material is measured by the measuring unit. For example, as various materials, -0.02v for paper, -0.1v for PET film, The deposited film thickness using aluminum was set to +0.5 V (500 mm).

The collating unit 29 constantly compares and collates the voltage of the electromagnetic wave change from the amplifying unit 18 and the electromagnetic wave information of various materials recorded in the material information recording unit 28, and the length of the moving sheet-like object to be measured. Recognize the material that spans the area.

In the authenticity discrimination information recording unit 30, information on materials over the length of the authentic sheet-like object to be measured is stored in advance in an information recording medium or the like.

The calculation unit 22 is a result of the material discrimination over the length of the sheet-like object to be measured by the collating unit 29, and the material information over the length of the authentic sheet-like object to be measured by the authenticity discrimination information recording unit 30; Are compared to perform true / false discrimination.

The result display unit 23 outputs the result of the calculation unit 22 to an external device or the like as 5 V if the result is authentic, and 0 V if the result is a freight, for example.

FIG. 11 shows the configuration of the second embodiment of the present invention. It is the example which used the material discrimination | determination apparatus of the sheet-like to-be-measured object of this invention for authenticity discrimination | determination. It is a figure explaining Example 2 which measured and produced the gift certificate 24 as a to-be-measured object. FIG. 11 shows a gift certificate 24 in which a safety thread 25 (a PET film layer 7 having a film thickness of 40 μm is coated with a metal vapor deposition layer 8 having a vapor deposition film thickness of 500 mm using aluminum and cut into a width of 3 mm) is embedded in a paper 26. FIG. 9 is a diagram showing a state in which authenticity is determined by moving over the leakage hole 2 of the apparatus described in FIG.

FIG. 12 shows detected voltage waveforms when three types of authentic ticket, counterfeit ticket by copying, and counterfeit ticket in which aluminum foil is attached to the counterfeit ticket by copying are measured.

FIG. 12A shows the waveform of a genuine note. Since the safety thread 25 has a base material and a vapor deposition layer stacked, the portions a and c of the curve show a negative polarity level due to PET as the thread base material, and the portion b shows a positive polarity level due to the aluminum vapor deposition film. It becomes the waveform which shows.

FIG. 12B shows a detected voltage waveform of a counterfeit ticket by copying. Since there is no deposited layer of the safety thread 25, the whole paper width range is slightly negative based on the dielectric constant of the paper, and the positive level is not indicated, so it is true / false The result is a fake.

FIG. 12 (c) shows a detected voltage waveform in which an aluminum foil is attached to a counterfeit ticket by copying. The curve b shows the level of positive polarity due to the aluminum foil, but since the PET that is the base material of the safety thread 25 is not overlaid, the level of negative polarity is not shown. Become.

FIG. 13 shows the configuration of the third embodiment of the present invention. It is the example which used the material discrimination | determination apparatus of the sheet-like to-be-measured object of this invention for authenticity discrimination | determination. It is a figure explaining Example 3 which measured the card | curd as a to-be-measured object. It is the figure which showed the state which is moving on the leak hole 2 of the apparatus shown in FIG. 8 and measuring the detection voltage waveform by making various cards 27 distribute | circulated in the market into a to-be-measured object.

FIG. 14 categorizes what detection voltage waveforms are obtained when various cards distributed in the market are measured, and can generally be classified into three types of detection voltage waveforms. In this example, the measurement was performed using three types of cards, ie, a telephone card (registered trademark) of a telephone company, an Io card of a railway company, and a highway card as examples of representative cards classified into three types of detected voltage waveforms. It shows what kind of detection voltage waveform is sometimes obtained.

FIG. 14A shows a detection voltage waveform generally found in a card in which a magnetic layer, a concealing layer, etc. are laminated on a base material, and a telephone card (registered trademark) of a telephone company is given as an example of this. be able to. The a and c portions of the curve showed a negative polarity level mainly due to the card base material, and the b portion showed a positive polarity level due to metal powder, high magnetic permeability alloy powder and the like.

FIG. 14B shows a detected voltage waveform seen in a card in which no metal powder, high magnetic permeability alloy powder, or the like exists, and an iocard can be given as an example. Curves “a” and “c” showed a negative polarity level due to the card base material and the like, but since no metal powder, high magnetic permeability alloy powder, etc. existed, no positive polarity level was shown in b.

FIG. 14 (c) is a card having the same configuration as FIG. 4 (a), but the portions a and c of the curve show negative polarity due to the card base material, etc., but the level is as shown in FIG. 14 (a). It was very small compared to the telephone card. The portion b showed a positive polarity level due to metal powder, high permeability alloy powder, or the like. A highway card can be given as an example.

Next, a configuration example of a discrimination device for identifying these cards will be described.
FIG. 16 shows one configuration of the third embodiment of the present invention. 10 differs from the configuration of FIG. 10 in that a card is provided to move the cards relative to each other, and in the authenticity determination information recording unit 30, various cards classified into three types of detected voltage waveforms, In this embodiment, the information of the detected voltage over the length of the telephone card, Io card and highway card is stored in advance.

The discrimination apparatus according to the third embodiment includes a measurement unit 34 including a microwave module 19, a waveguide 3, a reflector 16, an irradiation unit 31, a reception unit 32, a material information recording unit 28, and a verification unit including a verification unit 29. The determination unit 33, the calculation unit 22, the authenticity determination information recording unit 30, the result display unit 23, and the transport unit 35 are provided. Specifically, the irradiation unit 31 includes a transmission power source unit 17 and a microwave transmission unit 13, and the reception unit 32 includes a microwave reception unit 14, an amplification unit 18, a negative voltage adjustment unit 20, and a positive voltage adjustment unit 21. is doing.

The position of the reflector 16 is a position where the inside of the waveguide 3 becomes a cavity resonance state when the microwave module 19 is oscillated with the leakage hole 2 closed, that is, 65 mm from the left end of the waveguide 3. Arranged. The leakage hole 2 is a long hole having a diameter of 2 mm and a length of 4.5 mm, and is disposed at a position where a large electromagnetic field can be leaked from the leakage hole 2, that is, at a position 29 mm from the left end of the waveguide 3.

The amplification unit 18 amplifies the detection voltage from the microwave module 19, and in that case, the negative voltage is output when the amplitude of the detection voltage is a dielectric, and the positive voltage is output when the detection voltage is a conductor. The voltage adjustment unit 20 and the positive electrode voltage adjustment unit 21 are set in advance.

In the material information recording unit 28, when measuring paper, PET film, and aluminum foil, information on electromagnetic waves unique to various materials is stored in advance in an information recording medium (memory, ROM, RAM, etc.). The electromagnetic wave information unique to various materials refers to an estimated value at which the electromagnetic waves change when each material is measured by the measurement unit.

In the authenticity determination information recording unit 30, information on electromagnetic waves unique to each card, which is obtained when measuring telephone cards, Io cards, and highway cards over a length, is recorded in advance on an information recording medium (memory, ROM, RAM, etc.), etc. Remember it. The electromagnetic wave information unique to each card refers to an estimated value at which the electromagnetic wave changes when measured by the measuring unit over the length.

Information on electromagnetic waves unique to each card classified into the three types of detection voltage waveforms shown in FIG. 15 is recorded in advance in the authenticity discrimination information recording unit 30.
FIG. 15 (a) shows information on unique electromagnetic waves for identifying a card, for example, a telephone card, in which a magnetic layer, a concealing layer, etc. are generally overlaid on a base material. Based on the detected waveform of FIG. 14A, the determination conditions were determined as follows.
(1) Voltage of a <0 (2) Voltage of b> 0 (3) Voltage of c <0 (4) c <-0.8 × b
That is, it can be determined that the object to be measured is a telephone card when this condition is satisfied.

Similarly, FIG. 15 (b) shows information of a specific electromagnetic wave for identifying a card in which no metal powder, high magnetic permeability alloy powder or the like is present, for example, an Io card. Based on the detected waveform in FIG. 14B, the determination conditions were determined as follows.
a <0 (2) b <0 (3) c <0
That is, it can be determined that the device under test is an Io card when this condition is satisfied.

Similarly, FIG. 15C shows specific electromagnetic wave information for identifying the highway card. Based on the detected waveform of FIG. 14 (c), the determination conditions were determined as follows.
(1) a voltage <0 (2) b voltage> 0 (3) c voltage <0 (4) c> -0.8 × b
That is, it is determined that the object to be measured is a highway card when this condition is satisfied.

The verification unit 29 compares the voltage of the electromagnetic wave change over the length from the amplification unit 18 with the electromagnetic wave information unique to each card recorded in the authenticity discrimination information recording unit 30, and determines the type of the card. recognize.

The result display unit 23 can take the result of the collation unit 29 as a telephone card, Io card, highway card, or not applicable, and turn on the corresponding lamp.

As described above, since the dielectric constant is determined by the base material through the thickness of the card, and the conductivity is determined by metal powder, high magnetic permeability alloy powder, etc., the type of card can be identified. Is possible.

It is a figure which shows the structure of the material discrimination | determination apparatus of the sheet-like to-be-measured object of this Embodiment. It is a figure which shows the principle of this Embodiment. It is a figure which shows the fundamental to-be-measured object of this Embodiment. It is a figure which shows the relative position which moves and measures a leak hole and a to-be-measured object. It is a figure which shows the basic detection voltage waveform of this Embodiment. It is a figure which shows the relative position of the stationary state of this Embodiment. It is a figure which shows the detection voltage of the to-be-measured object of this Embodiment. It is a figure which shows the difference by the dimension and number of leak holes of this Embodiment. It is a figure which shows the material discrimination | determination apparatus of this Embodiment. It is a figure which shows Example 1 using the material discrimination | determination apparatus of the sheet-like to-be-measured object which concerns on a present Example. It is a figure which shows Example 2 using the material discrimination | determination apparatus of the sheet-like to-be-measured object which concerns on a present Example. It is a figure which shows the detection voltage waveform of the gift certificate of Example 2. FIG. It is a figure which shows Example 3 using the material discrimination | determination apparatus of the sheet-like to-be-measured object which concerns on a present Example. It is a figure which shows the detection voltage waveform of the various cards of Example 3. It is a figure which shows the electromagnetic wave information intrinsic | native on the various cards of Example 3. FIG. It is a figure which shows Example 3 using the material discrimination | determination apparatus of the sheet-like to-be-measured object which concerns on a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic wave 2 Leakage hole 3 Waveguide 4 Measured object 5 Electric field distribution 6 Magnetic field distribution 7 PET film layer 8 Metal vapor deposition layer 9 Transmission antenna 10 Transmission diode 11 Reception antenna 12 Reception diode 13 Microwave transmission part 14 Microwave reception part 15 Nonreflective terminator 16 Reflector 17 Transmission power supply unit 18 Amplification unit 19 Microwave module 20 Negative voltage adjustment unit 21 Positive voltage adjustment unit 22 Calculation unit 23 Result display unit 24 Prototype gift certificate 25 Safety thread 26 Paper 27 Card 28 Material information recording Unit 29 Verification unit 30 Authenticity discrimination information recording unit 31 Irradiation unit 32 Reception unit 33 Verification / discrimination unit 34 Measurement unit 35 Transport unit

Claims (5)

Discrimination of the material of the sheet-like object to be measured using an apparatus including a waveguide provided with at least one leakage hole and a reflecting plate, irradiation means for irradiating electromagnetic waves, receiving means for receiving the electromagnetic waves , and collation / discrimination means A way to do,
The position of the reflection plate and the leakage hole in the waveguide is determined based on the reception voltage when the sheet-like object is not on the leakage hole as a reference value (± 0), and the leakage hole is covered with a dielectric. The received voltage in the state is received as a value lower than the reference value (minus), and the leakage voltage is adjusted to a position where the received voltage in the state where the conductor is blocked is received as a value higher than the reference value (plus),
On the leakage hole of the waveguide, the sheet surface of the sheet-like object to be measured is placed facing,
The irradiation means irradiates the waveguide with electromagnetic waves,
The electromagnetic wave irradiated by the receiving means generates a magnetic field and an electric field distribution in the waveguide, propagates in the waveguide, leaks from the leakage hole , generates a magnetic field and an electric field distribution, and is emitted to the outside. When the leakage electromagnetic field is transmitted through the sheet-like object to be measured, the magnetic field and electric field distribution in the waveguide change according to the material characteristics of the sheet-like object to be measured, and the sheet-like object to be measured Is received as a value lower than the reference value in the case of a dielectric, and received as a value higher than the reference value in the case of a conductor. And
The electromagnetic wave change information received by the receiving means by the collating / discriminating means is compared with the electromagnetic wave information specific to the material that is input in advance as a discrimination criterion, and the electromagnetic wave change of any material A material discrimination method for a sheet-like object to be measured, wherein the material of the sheet-like object is discriminated by recognizing whether the information corresponds to information. A material for a sheet-like object to be measured using an apparatus provided with a waveguide provided with at least one leakage hole and a reflecting plate, irradiation means for irradiating electromagnetic waves, receiving means for receiving the electromagnetic waves , verification / discrimination means, and conveying means A method for determining
The position of the reflection plate and the leakage hole in the waveguide is determined based on the reception voltage when the sheet-like object is not on the leakage hole as a reference value (± 0), and the leakage hole is covered with a dielectric. The received voltage in the state is received as a value lower than the reference value (minus), and the leakage voltage is adjusted to a position where the received voltage in the state where the conductor is blocked is received as a value higher than the reference value (plus),
The irradiation means irradiates the waveguide with electromagnetic waves,
Sheet measured object by said conveying means conveys to pass through the leakage holes above the waveguide having the leakage hole,
The electromagnetic wave irradiated by the receiving means generates a magnetic field and an electric field distribution in the waveguide, propagates in the waveguide, leaks from the leakage hole , generates a magnetic field and an electric field distribution, and is emitted to the outside. When a leakage electromagnetic field is transmitted through the sheet-like object to be transported and passed over the leakage hole, the magnetic field in the waveguide and the magnetic field in the waveguide due to material properties of the sheet-like object When the electric field distribution changes and the sheet-like object to be measured is a dielectric, it is received as a value lower than the reference value, and in the case of a conductor, the sheet-like object to be measured is received as a value higher than the reference value . Received as information on the inherent electromagnetic changes in materials
The electromagnetic wave change information received by the receiving means by the collating / discriminating means is compared with the electromagnetic wave information specific to the material that is input in advance as a discrimination criterion, and the electromagnetic wave change of any material A material discrimination method for a sheet-like object to be measured, wherein the material of the sheet-like object is discriminated by recognizing whether the information corresponds to information. With respect to the first detection voltage before the sheet-like object to be measured arrives on the leakage hole of the waveguide having at least one leakage hole by the verification / discrimination means,
The second detection voltage when the sheet-like object to be measured moves onto the leakage hole is gradually reduced as the sheet-like object to be measured passes over the leakage hole. If it is lower than the detection voltage of 1, it is determined as a dielectric material,
When the voltage gradually rises and is higher than the first detection voltage, it is determined as a conductor material,
In the process of passing the sheet-like object to be measured, the voltage gradually decreases, becomes lower than the first detection voltage, and when the sheet-like object to be measured completely covers the leakage hole, the voltage is 3. The method for discriminating a material of a sheet-like object to be measured according to claim 2, wherein the material is composed of a dielectric material and a conductor material when the voltage rises above the first detection voltage. The material information of the sheet-like object to be measured determined by the collating / discriminating means is recorded, and the electromagnetic wave information of the material over the length of the recorded sheet-like object to be measured by the determining means, and the discrimination criterion 3. The sheet-like object to be measured according to claim 1 or 2, wherein the sheet-like object to be measured is identified by comparing and collating with electromagnetic wave information of a material over the length of the sheet-like object to be measured. Material identification method. Material discriminating apparatus for discriminating a sheet-like object to be measured, comprising a transport unit, a waveguide provided with at least one leakage hole and a reflector, an irradiation unit for irradiating and a receiving unit, and a collation / discrimination unit Because
The transport unit includes means for transporting the sheet-like object to be measured by moving it relative to the waveguide,
The measurement unit is configured such that when the sheet-like object to be measured closes the leakage hole, the waveguide enters a cavity resonance state, and the sheet-like object to be measured on the leakage hole is made of a dielectric material. WR42 type rectangular waveguide provided with the reflection plate and the leakage hole adjusted so as to be received as a negative voltage (minus) in the case, and as a positive voltage (plus) in the case of a conductor material; ,
The irradiation means for irradiating the waveguide with 24.15 GHz electromagnetic wave in TE10 mode, and the irradiated electromagnetic wave generates a magnetic field and an electric field distribution in the waveguide, and propagates in the waveguide. , is discharged to the outside occurs a magnetic field and electric field distribution leaking from the leak hole, when the electromagnetic field leaking the conveyed sheet measured object passes by the conveyance unit, the sheet-like object to be measured Means for receiving the change in the magnetic field and electric field distribution in the waveguide according to material characteristics, and receiving the change in the magnetic field and electric field distribution as information on the inherent electromagnetic wave change in the material of the sheet-like object to be measured;
The collation / discrimination unit records using collation data indicating a change in electromagnetic wave for each material of the sheet-like object to be measured;
The sheet is compared and collated with information on electromagnetic wave change obtained when measuring the sheet-like object to be measured by the measuring unit, and data for collation storing information on electromagnetic waves inherent to various materials in advance. Collating means for discriminating the material of the object to be measured;
A material discriminating device for a sheet-like object to be measured.

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