JP5073383B2 - Coin identification device - Google Patents

Description

  The present invention relates to a coin identification device used in a vending machine or the like.

  In coin recognition devices used in vending machines, money changers, game machines, pachinko ball lending machines, automatic cash dispensers (ATMs) or cash dispensers for cash registers, etc. Coins are detected and identified based on the output of an identification sensor group consisting of a plurality of identification sensors (various detections of material, outer diameter and thickness, identification sensors) provided along the line. Each of these identification sensors is a magnetic sensor provided with an identification coil (detection coil of material, outer diameter, and thickness). In each identification sensor, when a coin passes through each identification sensor, the impedance of each identification coil changes, and the output of each identification sensor changes accordingly. This amount of change in output is generally referred to as a feature amount in the technical field of coin identification devices. This feature amount varies depending on the type of coin, and the inserted coin is detected and identified based on the feature amount. Coins are often identified using the amount of voltage amplitude change as a feature amount. In general, coins are identified by setting an upper limit value and a lower limit value of a feature amount in advance for each type of coin, and determining whether or not the feature amount of the inserted coin falls within the range. Done. Usually, as the identification sensor, three magnetic sensors that are identified by performing material detection, outer diameter detection, and thickness detection as described above are used, and the feature amount of the coin is detected for each sensor.

  However, as vending machines have become more slim, it has become necessary to install a coin identification device in a narrow space. As a result, it has become unavoidable that each identification coil is located in a location close to a metal part, that is, a metal part such as an internal partition iron plate of a vending machine or the like. For this reason, it has been unavoidable that the impedances of the various identification coils change due to the influence of a metal part such as a vending machine. As a result, there is a problem that the feature amount is variously shifted depending on the state of attachment of the identification device to the vending machine or the like, and coins are not detected and identified correctly.

Conventionally, in order to solve this problem, a shield-like protective metal plate is attached in advance near the outside of each identification coil, and each identification coil is greatly influenced by the protective metal plate. Other than this, the influence of the external metal part is reduced to reduce the shift of the feature amount (see, for example, Patent Documents 1-3).
JP-A-3-214385 Japanese Patent Laid-Open No. 48-19297 Japanese Utility Model Publication No. 51-154595

  In recent years, there have been a lot of mischief and theft cases with various counterfeit coins, and counterfeit coins have become more sophisticated year by year. In addition, there is an increasing demand for attaching a coin identification device to a narrower place than before.

  Because of such circumstances, the present inventor has a problem that it is difficult to obtain sufficient detection, identification, or identification accuracy in the near future with the conventional method of suppressing the shift of the feature amount by attaching the metal plate. Predicted. Because of this problem, the inventor has uniquely recognized the need to develop a new method for suppressing the shift of the feature amount due to the influence of the metal part such as a vending machine as a metal casing. By further suppressing the shift of the feature amount due to the metal part of a vending machine, etc., the variation in the shift can also be suppressed, and the range of the upper limit value and the lower limit value for determining the coin can be reduced accordingly. This is because it was originally thought that more accurate coin identification would be possible.

  The present invention has been made in view of the above-mentioned problems and necessity unique to the inventor uniquely found by the inventor, and an object thereof is to provide a coin identifying apparatus that can be appropriately identified. To do.

  The coin identification device according to the present invention is a coin identification device having a coin passage through which a coin passes and a coin identification coil unit that is arranged along the coin passage and identifies a coin, and electrically connects the ends. A conductive member having an inductance component, and the conductive member is provided on a side opposite to the coin passage side of the coin identifying coil portion and provided between the coin identifying coil and the metal portion. Features.

  Moreover, the coin identification device of this invention WHEREIN: In a coin identification device which has a coin channel | path which a coin passes, and a coin identification coil part which is arrange | positioned along the said coin channel | path and identifies a coin, edge parts are electrically connected. A board on which a conductive member having an inductance component is formed, the board being on the side opposite to the coin path side of the coin identification coil part, and between the coin identification coil and the metal part It is provided.

  According to the coin identification device of the present invention, a coin can be appropriately identified.

  Before describing the embodiments of the present invention, the principle, features, etc. of the present invention that the inventors have conceived of will be described.

  Unlike the conventional technique of attaching a metal plate near the outside of the identification coil, the present invention attempts to reduce the influence of the external metal plate by actively absorbing the leakage magnetic flux from the identification coil. It was made based on the principle that the person originally came up with.

  In other words, those skilled in the art other than the present inventor consider that the conventional metal plate is sufficient, and for this reason, the problem is not particularly recognized, and in addition, the present inventor is more coil than the conventional metal plate, As explained below, this invention was made with the original idea that more accurate correct / false discrimination can be achieved by eliminating the leakage flux more effectively, and only the present inventor can do it independently. This is an invention.

  More details are as follows.

  A person skilled in the art has not recognized that the response by the conventional attachment of a metal plate is insufficient.

  Therefore, for those skilled in the art, the conventional problem of attaching a metal plate is not sufficient, and the technical problem that it is necessary to correct or deny coins with higher accuracy has not been recognized.

  Because of these circumstances, there is no motivation for a person skilled in the art other than the present inventor to make a new invention. In other words, such an idea by those skilled in the art has become an obstacle, and there is no possibility that a person skilled in the art can make a new invention.

  Further, as described above, from the viewpoint of a person skilled in the art, generally, a method of attaching a metal plate or a magnetic shielding plate, which is a conventional technique, is generally employed in order to block leakage magnetic flux from a coil. Here, in order to obtain higher efficiency, those skilled in the art may consider a method of attaching a circuit including a coil for absorbing the leakage magnetic flux as an electromagnetic method.

  However, conversely, it is common for those skilled in the art to consider that the method of providing a circuit including such a coil adversely affects the coin identification performance on the identification coil side. Therefore, in general, it cannot be assumed that a person skilled in the art uses a coil.

  However, the inventor has intentionally made the present invention paying attention to a coil that is not assumed by those skilled in the art. The reason is that the present inventor is more efficient to attach the secondary coil closer to the identification coil than to attach the metal plate to the identification coil with respect to the leakage magnetic field (original magnetic field) emitted from the identification coil. This is because we originally thought that the leakage magnetic field could be attenuated.

  Such an idea originated from the following unique technical viewpoint of the present inventor.

  (1) In the case of a metal plate, the magnitude of the repulsive magnetic field caused by the eddy current generated in the metal plate does not occur as much as the original magnetic field. Therefore, the rate at which the original magnetic field can be canceled by the repulsive magnetic field is naturally low, and the efficiency is poor.

  Further, in the case of a metal plate, electrical properties such as impedance matching cannot be used due to its properties. For example, assuming that the distance between the identification coil and the metal plate is constant, the repulsive magnetic field caused by the eddy current is Since the size is uniformly determined by the specific resistance of the metal plate, it is difficult to easily change the efficiency.

  (2) On the other hand, in the case of a coil, a physical phenomenon due to a phase-matching coupling described later can be used due to the nature of the coil. Therefore, matching can be performed according to the electromagnetic characteristics of the leakage magnetic field, and the leakage magnetic field can be efficiently processed. It can be easily attenuated.

  As can be seen from the above description, the present invention has a unique recognition and problem that the present inventor is not sufficient to cope with the conventional attachment of the metal plate, and further, a secondary for absorbing the leakage magnetic flux. It was completed by experimentally verifying the effect of adding a circuit including a coil.

  That is, the present inventor first attaches an additional circuit including a secondary coil separately from the back side of the detection coil, and absorbs leakage magnetic flux from the detection coil by the additional circuit including the secondary coil. We conducted an experiment to verify and confirm whether it was possible. As a result, unexpectedly, that is, contrary to the technical expectation of those skilled in the art, by appropriately adjusting the impedance and resistance value of the coil, the coin identification performance on the detection coil side is not adversely affected. It was confirmed by data that the attached circuit including the next coil can absorb the leakage magnetic flux from the detection coil more efficiently than the conventional method of attaching the metal plate.

  In addition, a capacitor is included in the attached circuit including the secondary coil to form a resonance circuit, and the resonance frequency of the resonance circuit is tuned with an alternating magnetic field generated by the detection coil, so that the detection coil and the secondary coil of the attached circuit are interposed. Experiments have shown that phased coupling (flux pull-in phenomenon) occurs and the leakage flux from the sensing coil can be absorbed better.

  As a result of such an experiment, the inventor was able to confirm that the above-described original technical viewpoint of the inventor was correct.

  That is, in the case of a metal plate, the repulsive magnetic field caused by the eddy current generated in the metal plate does not occur as much as the original magnetic field, and the magnitude of this repulsive magnetic field is uniformly determined by the specific resistance of the metal plate. It is determined. On the other hand, in the case of a circuit including a coil, electrical properties such as impedance matching can be used, and further, a physical phenomenon due to phase coupling can be used. Therefore, the design according to the electrical characteristics of the leakage magnetic flux is possible, and the leakage magnetic flux can be absorbed more efficiently than in the case of a metal plate.

  Furthermore, in practical terms, we focused on the substrate to be attached to the various detection coils and independently reached the idea of forming a printed coil on this substrate. With this configuration, space can be saved.

  Moreover, the adjustment according to the attachment state of a coin identification device is also attained by making a coil, a capacitor, and resistance in an attached circuit variable.

  As described above, according to the present invention, the leakage magnetic flux from various detection coils can be efficiently absorbed electromagnetically by the auxiliary circuit including the secondary coil, and further, on the substrate attached to the various detection coils. By forming the printed coil on the space, it is possible to save space.

  Although the principle of the present invention has been described above, the principle of the present invention will be described in more detail with reference to FIG.

である。この振動電流によってＬ_１に発生する磁束Φは時間的に変化するから、コイルＬ_２を貫く磁束Φも時間的に変化し、コイルＬ_２に誘導電流が発生する。したがって、Ｌ_２、Ｃ_２からなる回路にも周波数負の振動電流が流れる。
二次側の共振周波数は、

であるから、ｆ_１＝ｆ_２となるとき共鳴（同調）が起こるのでＬ_２、Ｃ_２からなる回路の振動電流が最大となる。（一次側の共振周波数＝二次側共振周波数となったとき二次側の電流は最大となる。）ここで、二次側に流れる電流は、同調が起こったときに最大となるから、そのときのＬ_２の値を求めると、

となる。 As shown in FIG. 4, when two vibration circuits are close to each other, each coil causes an electromagnetic induction phenomenon with another coil through a changing magnetic field. When the switch is tilted to the a side and C ₁ is charged and then the switch is tilted to the b side, the charge stored in C ₁ is discharged. However, since L ₁ is present, an oscillating current is generated and its frequency Is

It is. Since the magnetic flux Φ generated in L ₁ by this oscillating current changes with time, the magnetic flux Φ passing through the coil L ₂ also changes with time, and an induced current is generated in the coil L ₂ . Therefore, a negative-frequency oscillating current also flows through a circuit composed of L ₂ and C ₂ .
The secondary side resonance frequency is

Therefore, since resonance (tuning) occurs when f ₁ = f ₂ , the oscillation current of the circuit composed of L ₂ and C ₂ becomes the maximum. (When the resonance frequency on the primary side = the resonance frequency on the secondary side, the current on the secondary side becomes maximum.) Here, the current that flows on the secondary side becomes maximum when tuning occurs. when determining the value of L ₂ when,

It becomes.

  The present invention is based on the above-mentioned idea. In addition, when the alternating magnetic field generated from the back surface of the sensing coil is tuned to the resonance frequency of the printed coil, the alternating magnetic field is absorbed by the printed coil and decreases. This utilizes the property of phase coupling (magnetic flux pull-in phenomenon).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below do not limit the technical scope of the present invention.

  FIG. 5 is a schematic explanatory view of the entire coin identifying device 100 as one embodiment of the present invention as seen from the front. This coin identification device 100 is a machine that requires coin identification such as a vending machine, a change machine, a game machine, a pachinko ball lending machine, an automatic cash dispenser (ATM), or a change dispenser for cash registers. It is built in.

  In this coin identification device 100, a coin passage 2 is formed by being sandwiched between two coin passage walls 1, 1 (see FIG. 1) facing each other in the thickness direction of the paper surface of FIG.

  A coin insertion port 101 communicating with the coin passage 2 is formed on the most upstream side of the coin passage 2.

  A first rail 102 is provided below the coin slot 101 in the coin passage 2. As can be seen from FIG. 1, the first rail 102 is formed in a protruding state inside one of the coin passage walls 1 and 1, and, as shown in FIG. Further, it is formed in an inclined state in which the right end side in the figure as the downstream side is lowered.

  In the middle of the first rail 102, as can be seen from FIG. 5, the identification sensor group 3 is provided from the upstream side to the downstream side. The identification sensor group 3 includes a material sensor 3A, an outer diameter sensor 3B, and a thickness sensor 3C. The material sensor 3A, the outer diameter sensor 3B, and the thickness sensor 3C determine whether the coin 107 inserted into the coin insertion slot 101 is true or false. These material sensor 3A, outer diameter sensor 3B, and thickness sensor 3C have the characteristic configuration of the present invention, and will be described in detail later.

  A correct / false distribution unit 109 for distributing genuine / fake coins is provided slightly ahead of the tip of the first rail 102. This genuine / false distribution unit 109 includes a genuine / false coin distribution solenoid 104 and a genuine / false coin distribution piece 105. These true / false coin sorting solenoids 104 deactivate / activate the true / false coin sorting pieces 105 according to the signal of the judgment result of the true / false by the identification sensor group 3. By the operation of the genuine / fake coin sorting piece 105, the coin 107 passes through the next genuine coin passage (not shown) according to the positive (true coin) and false (fake coin) of the determination result. Then, the coins are distributed and sent to either a coin type outlet 108 and a discharge port (not shown) such as a return port through a false coin passage (not shown).

  The coin type outlet 108 separates the coins 107 determined to be true for each type and drops and stores them in the storage unit AD, and includes a second rail 106 that guides the coins 107 determined to be true. Like the first rail 102, the second rail 106 is formed so as to protrude inward from one of the coin passage walls 1 and 1, and is shown in FIG. As shown in the drawing, the tip end side in the left direction in the figure as the downstream side is lower than the upstream side, and is inclined. As a result, the coin 107 sent to the coin type outlet 108 by the genuine / fake coin sorting piece 105 rolls the second rail 106 in the lower left direction in the figure, and according to the type, the storage portion AD. Dropped into one of the above.

  The material sensor 3A, the outer diameter sensor 3B, and the thickness sensor 3C of the identification sensor group 3 are configured as follows. However, the material sensor 3A, the outer diameter sensor 3B, and the thickness sensor 3C have almost the same configuration. Therefore, here, the material sensor 3A as one of them will be described.

  As shown in FIG. 1, the material sensor 3A has a metal part such as a vending machine (a metal part that is a casing of the vending machine or a metal part of a device installed inside the vending machine) 5 It is installed close to. As described above, the material sensor 3A is configured not to be affected by the metal part 5 of this vending machine or the like. That is, the material sensor 3A has a pair of material detection coils 3a and 3a, which are attached to face the coin passage walls 1 and 1, respectively, and sandwich the coin passage walls 1 and 1 and the coin passage 2. Facing each other. The substrates 4 and 4 are attached to the outer end surface of the material detection coils 3a and 3a opposite to the coin passage 2 side. As a result, one material detection coil 3a faces the metal part 5 of the vending machine or the like through the substrate 4. The substrates 4 and 4 are opposite to the coin passage 2 side of the material detection coils 3a and 3a, and need only be between the material detection coils 3a and 3a and the metal part 5, and are not necessarily limited to the material detection coils 3a, It does not need to be attached to 3a.

  The pair of substrates 4 and 4 are both configured in the same manner. As an example, the configuration is shown in FIG. 2 and the circuit is shown in FIG.

  In the substrate 4 of FIG. 2, 4a is a printed coil made of copper foil, 4b is a substrate body made of an insulating material, and 6 is an external capacitor. The printed coil 4a is printed on the substrate body 4b so as to spread from the vicinity of the center of the substrate 4 to form an inductor L. The inductor L and the capacitor 6 constitute an LC resonance circuit shown in FIG.

  In FIG. 1, the magnetic flux tends to leak from the right side (back) of the material detection coil 3a on the right side of the material sensor 3A toward the metal part 5 of the vending machine or the like. However, the magnetic flux to be leaked is absorbed and lost by the LC resonance circuit (FIG. 3) including the inductor L of the printed coil 4a, the capacitor C connected in parallel with the printed coil 4a, and sold automatically. The metal part 5 such as a machine is not reached. That is, even if the metal part 5 such as the vending machine is disposed close to the material sensor 3A, the magnetic flux to be leaked does not reach the metal part 5 such as the vending machine. For this reason, the inspection of the coin 107 by the material sensor 3A can be properly performed without being influenced by the metal part 5 of the vending machine or the like.

  As described above, the other two outer diameter sensors 3B and thickness sensor 3C are configured in substantially the same manner as the material sensor 3A, function in the same manner, and are not affected by the metal part 5 such as a vending machine. Can be done.

  The coin identifying device 100 is configured as described above, and operates as follows.

  That is, as can be seen from FIG. 5, the coin 107 inserted from the coin insertion slot 101 in the coin identification device 100 is directed to the first rail 102 provided below the coin insertion slot 101 by natural fall in the coin passage 2. Fall. The coin 107 received by the first rail 102 in the downward direction falls while rolling on the first rail 102 in the lower right direction in the figure away from the coin slot 101. The coin 107 sequentially passes through the material sensor 3A, the outer diameter sensor 3B, and the thickness sensor 3C of the identification sensor group 3 while rolling on the first rail 102. While the coin 107 passes through the material sensor 3A, the outer diameter sensor 3B, and the thickness sensor 3C, the authenticity of the coin 107 is inspected. As described above, this authenticity check is properly performed without being affected by the metal part 5 such as a vending machine due to the presence of the substrate 4.

  When the result of the inspection performed in this way is that the coin 107 is determined to be authentic, the correct / false coin distribution is based on the determination signal output from the output terminal (not shown) of the identification sensor group 3. The solenoid 104 is driven. By this drive, the genuine / false coin sorting piece 105 is operated, and the coin 107 is guided to a not-shown genuine coin path, that is, to the second rail 106, and dropped into one of the storage parts A-D depending on the type of the coin. Stored. However, if the result of the inspection is that the coin 107 is determined to be a fake coin, the coin 107 is guided to a fake coin passage (not shown) without being operated, and discharged from a discharge port (not shown). Let

  The shape of the printed coil 4a formed on the substrate body 4b in the substrate 4 is not limited to that shown in FIG. The printed coil 304a formed on the substrate main body 304b may be elliptical or circular as shown in FIG. 8 and other shapes according to the outer shape of each material sensor 3A, outer diameter sensor 3B, and thickness sensor 3C. That is, the printed coil 4a only needs to have an inductance component, and can take any shape such as a polygon or a star. The material of the coil is not limited to copper, and an appropriate conductive material such as a copper alloy or aluminum can be used. Furthermore, the coil component (inductor L) of each detection coil 3a-3c in the embodiment of the present invention is not limited to the printed coil on the substrate body 4b, and is provided on the flexible substrate as long as it has an inductance component. It may take any form such as a wire, a wire wound like a piece of thread, or a wire wound around a plastic hobbin.

  FIG. 9 is a diagram showing an LC resonance circuit according to another embodiment of the present invention. In FIG. 9, the resistor R is a dump resistor. The Q of the LC resonance circuit is lowered by connecting a dump resistor R to the LC resonance circuit. Specifically, the peak shape of the graph showing the impedance change shown in FIG. 6 to be described later can be changed from a steep shape to a gentle shape. As a result, the magnetic flux pulling characteristics due to the phase coupling can be set to an appropriate value, so that the degree of the influence of the identification coil 3 by the metal part such as the vending machine can be set to a minimum value. .

  The equivalent circuit using the printed coil 4a and the capacitor C in each material sensor 3A, outer diameter sensor 3B, and thickness sensor 3C is not limited to the circuits shown in FIGS. As shown in FIGS. 10 to 13, the equivalent circuit of each material sensor 3A, outer diameter sensor 3B, and thickness sensor 3C only needs to include a minimum coil component. That is, the coil whose both ends are short-circuited (FIG. 10), the resistor connected in parallel to both ends of the coil (FIG. 11), the capacitor connected to both ends of the coil (FIG. 12), and the capacitor connected to both ends of the coil And any form such as a series connection of resistors. The circuit example of FIG. 10 is a circuit positioned as the highest concept. Further, at least one of the coil, the capacitor, and the resistor can be made variable. With this configuration, there is an advantage that individual adjustment is possible according to the state of attachment of the identification device to a vending machine or the like, that is, a design margin can be increased.

  In summary, the circuit component only needs to have the lowest inductance component and its ends are electrically connected to each other, and both ends of this coil may be directly connected, or , Resistor R, capacitor C, or inductor L. At this time, the resistance R, the capacitor C, or the inductor L may be fixed or variable, and the variability may be continuous or stepwise. Further, both ends of the coil may be connected through a parallel connection body in which an arbitrary number of capacitors, an arbitrary number of resistors, or an arbitrary number of inductors are connected in parallel. In this case as well, any of the resistors, capacitors, and inductors can be fixed or variable. In any of the above examples, the coil may be configured as shown in FIG. 13 so that the inductance is variable. The configuration for making the coil variable in inductance is not limited to that shown in FIG.

  FIG. 6 is a diagram showing a frequency response with respect to impedance in the LC resonance circuit as the embodiment of the present invention. As shown in FIG. 1, this figure is measured with the substrate 4 attached to the detection coils 3-1 and 3-1 in the material sensor 3 </ b> A, the outer diameter sensor 3 </ b> B, and the thickness sensor 3 </ b> C. From this figure, it can be seen that the resonance frequency of the LC resonance circuit is around 70 KHz. In addition, the impedance is small near the frequency of 80 KHz, which indicates that the resonance frequency of the identification coil is near 80 KHz, and the above-described phase-coupling (magnetic flux pulling phenomenon) occurs.

  FIG. 7 is a diagram for comparing feature amounts of coins in the related art and the embodiment of the present invention. The feature quantity of n Japanese 500 yen coins is measured by the material sensor 3A, the outer diameter sensor 3B and the thickness sensor 3C of the coin discriminating apparatus according to the embodiment of the present invention, and the maximum value (Max value), the average value, and The minimum value (Min value) is shown. Here, the amount of change in the amplitude of the output voltage of the identification sensor is used as a feature amount.

  In FIG. 7, reference numeral 200 denotes a conventional material sensor that does not have a substrate 4, an outer diameter sensor, and a thickness distribution, and a distribution of feature amounts in a state where there is no metal part 5 such as a vending machine (original state). Distribution of features in the state where the metal part 5 of the vending machine or the like is brought close to each of the conventional sensors not having the metal, 202 is a metal part of the vending machine or the like by attaching a metal plate according to the prior art to each of the conventional sensors. The distribution of the feature amount in the state in which 5 is close to the coil portion, and 203 is the state in which the metal portion 5 such as a vending machine is close to the LCR circuit (circuit of FIG. 9) according to the embodiment of the present invention having the substrate 4. The distribution of the feature quantity of each is shown.

  As a result of experimental confirmation, the average value of the feature amount when the metal plate according to the prior art was attached to the coil portion was found to be 1% of the original value.

  On the other hand, when the LCR circuit according to the embodiment of the present invention is attached to the coil portion, the average value of the feature amount is 0.2% of the original value, which is 1/5 smaller than that of the conventional metal plate. I understand.

  As described above, according to the embodiment of the present invention, automatic operation is possible regardless of the state of attachment to a vending machine or the like, which has an effect superior to that obtained by attaching a metal plate near the outside of a conventional identification coil. It is possible to provide a coin identifying device that is not affected by a metal part such as a vending machine.

It is principal part sectional drawing which shows a certain detection coil as embodiment of this invention. It is a figure which shows an example of the board | substrate in FIG. 1, and the printed coil with which it is provided. 3 is an equivalent LC resonance circuit of the substrate of FIG. It is a circuit diagram for demonstrating the principle of this invention. It is the schematic block diagram which looked at the whole coin identification device in the embodiment of the present invention from the front. It is a figure which shows the frequency response with respect to the impedance of the attached LC resonance circuit in embodiment of this invention. It is a figure for comparing the feature-value of the coin in embodiment of this invention with a prior art. It is a figure which shows the board | substrate in another embodiment by this invention, and the printed coil with which it is provided. It is another example of the equivalent circuit which concerns on embodiment of this invention. It is another example of the equivalent circuit which concerns on embodiment of this invention. It is another another example of the equivalent circuit which concerns on embodiment of this invention. It is another example of the equivalent circuit which concerns on embodiment of this invention. It is another example of the equivalent circuit which concerns on embodiment of this invention.

Explanation of symbols

1 Coin passage wall
2 Coin passage
3 Identification sensor group
3A material sensor
3B outer diameter sensor
3C thickness sensor
3a Material detection coil
3b Outer diameter detection coil
3c Thickness detection coil
4, 304 substrate
4a, 304a printed coil
5 Metal parts such as vending machines
6, 306 capacitors

100 coin recognition device
101 coin slot
102 First rail
104 True / false coin sorting solenoid
105 Authentic counterfeit coin
106 Second rail
107 coins

200 Distribution of features when the identification coil has no attachments and no metal around it (original state)
201 Distribution of features when the identification coil has no attachment and the metal part is close to the identification coil part
202 Feature distribution in the state where the metal plate is attached to the identification coil and the metal part is close to the identification coil part
203 Characteristic distribution in a state where the LCR circuit (circuit of FIG. 9) according to the present invention is attached to the identification coil portion and the metal portion is close to the identification coil portion.

Claims (2)

A coin identification device mounted in a device having a metal part, wherein the coin identification device includes a coin passage through which a coin passes, and a coin identification coil unit that is arranged along the coin passage and identifies a coin.
Electrically connecting ends to each other, comprising a conductive member having an inductance component,
The conductive member is on the side opposite to the coin passage side of the coin identification coil portion, and is provided between the coin identification coil and the metal portion.
Coin identification device. A coin identification device mounted in a device having a metal part, wherein the coin identification device includes a coin passage through which a coin passes, and a coin identification coil unit that is arranged along the coin passage and identifies a coin.
The substrate is provided with a conductive member having an inductance component electrically connected between the ends,
The board is provided on the side opposite to the coin passage side of the coin identification coil part and provided between the coin identification coil and the metal part,
Coin identification device.

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