JP5504755B2 - Low frequency near electromagnetic field detection sensor and game machine - Google Patents

Description

  The present invention relates to a low-frequency near electromagnetic field detection sensor and a gaming machine, and in particular, a proximity switch malfunctions a low-frequency near electromagnetic field that causes a malfunction in a proximity switch that detects passage of a game ball provided in the gaming machine. The present invention relates to a low-frequency near electromagnetic field detection sensor that can be detected at a timing before the game, and a gaming machine.

  The pachinko gaming machine is equipped with a plurality of game ball detection switches for detecting a game ball, and outputs a detection signal to the control circuit when the game ball passes through a main winning opening and a gate.

  The mainstream in this game ball detection switch is a direct current 2-wire proximity switch. The DC 2-wire proximity switch can be used in the same image as the contact switch by operating in the form of 2-wire open or closed operation, and also for detecting metal balls in a non-contact manner Since the superiority such as excellent durability is evaluated, it is used more frequently than the game ball detection switch using other principles.

  However, since the proximity switch is configured by an electronic circuit, it has been found in the past that a fraudulent act that exploits a weak point caused by the configuration of the electronic circuit has been detected. For example, if a player deliberately brings a transceiver or mobile phone close to a pachinko gaming machine for improper purposes, the radio wave is emitted to the pachinko gaming machine, and the gaming ball detection switch falls into a functional disorder due to the radio wave. The ball count could be manipulated incorrectly.

  Therefore, as a technology to detect radio waves before the occurrence of the above-mentioned functional failure, a radio wave sensor is installed for each pachinko machine, an antenna is formed with a printed circuit board pattern, and magnetic flux concentration is achieved with a ferrite core, thereby achieving the desired sensitivity. The technology to detect dead radio waves radiated toward the game board surface by securing the insensitive band, but to set the dead band in the LC series resonance circuit to stop the detection operation for the radio waves emitted from mobile phones etc. (See Patent Document 1).

JP 2004-222959 A

  By the way, a recent study has recognized that a game ball detection switch may malfunction due to a relatively low frequency AC noise superimposed on a metal part of a pachinko gaming machine. This AC noise becomes prominent in the band near the resonance frequency of the LC resonance circuit provided in the game ball detection switch, and becomes a problem of matching of the noise band generated naturally. In general, the resonance frequency of the LC resonance circuit is set to 500 kHz to 1.2 MHz, and this resonance frequency band belongs to a low-frequency near electromagnetic field region lower than the radio wave band. Actually, the detection band of the above-described conventional radio wave sensor is 50 Mhz to 2 Ghz, and there is a risk of detection leakage due to band mismatch.

  In addition, the reaction region of the electromagnetic field in the vicinity of the low frequency of the game ball detection switch and the detection region of the conventional radio wave sensor do not always coincide with each other, and there is a possibility that monitoring omission occurs. More specifically, this is due to the directivity of the penetrating coil of the game ball detection switch, and even if the sensitivity is high in the vertical direction of the through hole, the side surface direction may be a dead area. Therefore, while the sensitivity is insufficient in the game ball detection direction, there is a risk that trouble may occur due to detection of a non-malicious electromagnetic wave such as a mobile phone generated from a direction that does not require detection.

  The present invention has been made in view of such a situation, and the low-frequency near electromagnetic field is generated at the timing before the malfunction of the game ball detection switch is caused by the low-frequency near electromagnetic field generated inside the pachinko gaming machine. By making it possible to detect, it is possible to appropriately monitor the low-frequency near electromagnetic field and to suppress the functional failure of the game ball detection switch.

According to the first embodiment of the present invention, there is provided a low-frequency near electromagnetic field detection sensor that is mounted on a pachinko gaming machine and includes a first high-frequency oscillation circuit, which is used in combination with a proximity switch that detects a game ball, A proximity switch that includes a second high-frequency oscillation circuit that oscillates a high-frequency signal in a band corresponding to the first high-frequency oscillation circuit , a coil that detects arrival of a low-frequency near electromagnetic field by voltage induction, and the coil; LC resonance circuit in which the resonance frequency is set to be a frequency corresponding to the resonance frequency of , and a shield member that surrounds a part of the coil surface and opens another part different from the part, Oscillation stop means for setting the oscillation state of the second high-frequency oscillation circuit, and oscillation detection means for detecting oscillation of the second high-frequency oscillation circuit, wherein the oscillation stop means has the low-frequency near electromagnetic field Irradiation If not, the oscillation of the second high-frequency oscillation circuit is stopped, and when the electromagnetic field near the low frequency is irradiated, the second high-frequency oscillation circuit is oscillated, and the LC resonance circuit A proximity switch for detecting a sphere, including a coil larger than an inductive component of the coil of the LC resonance circuit, and a capacitor having a smaller capacitance component than a capacitor included in the proximity switch for detecting the game ball, and the LC resonance circuit There is provided a low-frequency near electromagnetic field detection sensor in which the resonance frequency by the coil and capacitor is set to be the resonance frequency by the coil and capacitor of the LC resonance circuit included in the proximity switch for detecting the game ball.
Further, according to the second embodiment of the present invention, a first LC resonant circuit including a first coil and a first capacitor Yu technique ball passes, the gaming ball has passed through the first coil And a first signal processing unit for detecting that the oscillation at the first resonance frequency defined by the first LC resonance circuit is stopped based on the voltage induced in the first coil. A low-frequency near electromagnetic field detection sensor used in combination with a proximity switch and mounted on a pachinko gaming machine, wherein a second coil corresponding to the first coil and a second capacitor corresponding to the first capacitor are provided. The second LC resonance circuit including the low-frequency near electromagnetic field has arrived by the second resonance frequency defined by the second LC resonance circuit based on the voltage induced in the second coil. Detected when oscillation starts A signal processing unit, wherein the inductance of the second coil, the first greater than the inductance of the coil, the first resonant frequency is equal to the second resonance frequency, said second The capacitance of the capacitor is smaller than the capacitance of the first capacitor, and the product of the inductance of the second coil and the capacitance of the second capacitor is the inductance of the first coil and the capacitance of the first coil. A low frequency near electromagnetic field detection sensor equal to the product of the capacitance of the first capacitor is provided.

  By setting the detection directivity of the low-frequency near electromagnetic field detection sensor according to the opening direction of the shield member, and by setting the detection area of the low-frequency near electromagnetic field detection sensor according to the size of the opening, The detection region of the low-frequency near electromagnetic field detection sensor can include a region in which the proximity switch that detects the game ball causes a malfunction due to the low-frequency near electromagnetic field.

  The LC resonance circuit includes a coil that is larger than the induction component of the coil of the LC resonance circuit that the proximity switch that detects the game ball has, and a capacitance component that is smaller than the capacitor that the proximity switch that detects the game ball has. A capacitor is included, and the resonance frequency of the LC resonance circuit by the coil and the capacitor is set to be very similar to the resonance frequency of the LC resonance circuit by the proximity switch for detecting the game ball and the capacitor. Can be.

  The oscillation stopping means can be set to have a negative conductance so as to stop the oscillation of the second high-frequency oscillation circuit, and to set the negative conductance by setting a constant of a sensitivity adjustment resistor. can do.

  The oscillation stop means can be set to have a negative conductance so as to stop the oscillation of the high-frequency oscillation circuit by fixedly installing a metal lump in the detection region of the coil.

  The gaming machine of the present invention can include the low-frequency near electromagnetic field detection sensor according to any one of claims 1 to 5 and a proximity switch that detects the game ball.

  When the low-frequency near electromagnetic field detection sensor detects the arrival of a near electromagnetic wave, a notification means for notifying the inside of the gaming machine or the outside of the gaming machine based on the output signal may be further included. it can.

  The low-frequency near electromagnetic field detection sensor can be disposed in the vicinity of a metal member or a metal plated structure disposed on the board surface of the gaming machine.

  The proximity switch for detecting the game ball may include a first through hole for detecting the passage of the game ball, and the near electromagnetic field detection sensor is substantially the same as the first through hole. A second through-hole having the same shape can be included, and the first through-hole and the second through-hole can be arranged so that their center lines are coaxially arranged. it can.

  The low-frequency near electromagnetic field detection sensor of one aspect of the present invention is, for example, an abnormality detection unit, and the proximity switch mounted on the pachinko gaming machine is, for example, a proximity switch of a game ball detection unit, The high-frequency oscillation circuit is, for example, a high-frequency oscillation circuit of a game ball detection unit, and the second high-frequency oscillation circuit that oscillates a high-frequency signal in a band very similar to the first high-frequency oscillation circuit is, for example, an abnormality detection The high-frequency oscillation circuit of the unit, which detects the arrival of a low-frequency near electromagnetic field by voltage induction, is a coil of the anomaly detection unit, includes the coil, and a frequency very similar to the resonance frequency of the proximity switch The LC resonance circuit whose resonance frequency is set to be is an LC resonance circuit composed of a coil and a capacitor of an abnormality detection unit, which surrounds a part of the coil surface and is different from the part For example, the shield member having a part opened is a shield member of an abnormality detection unit, and the oscillation stop means for setting the oscillation state of the second high-frequency oscillation circuit is, for example, a high-frequency oscillation circuit of the abnormality detection unit The oscillation detection means for detecting the oscillation of the second high-frequency oscillation circuit is, for example, a discrimination circuit, and the low-frequency near electromagnetic wave is adjusted by the adjustment resistance as the oscillation stop means. When the field is not irradiated, the oscillation of the second high-frequency oscillation circuit is stopped, and when the electromagnetic field near the low frequency is irradiated, the second high-frequency oscillation circuit is oscillated.

  With such a configuration, when a low-frequency near electromagnetic field arrives at the proximity switch, the low-frequency near electromagnetic field detection region includes a range in which the proximity switch is affected by the low-frequency near electromagnetic field due to the configuration of the shield member. In addition, by setting the resistance value of the adjustment resistor, which is the oscillation stop means, when the electromagnetic field near the low frequency is not irradiated, the oscillation of the high frequency oscillation circuit in the abnormality detection unit is stopped. When a low-frequency near electromagnetic field is irradiated, by detecting the oscillation of the high-frequency oscillation circuit by causing the high-frequency oscillation circuit to oscillate in the abnormality detection unit, the proximity switch malfunctions due to the low-frequency near electromagnetic field. It is possible to detect that a low-frequency near electromagnetic field has an influence on the proximity switch at a timing before the occurrence of.

  As a result, due to the influence of the magnetic field near the low frequency, the arrival of the electromagnetic field near the low frequency at the proximity switch is detected at the stage where the arrival of the electromagnetic field near the low frequency is detected before the proximity switch as the game ball detection switch malfunctions. It is possible to suppress malfunctions caused by the above, and it is possible to suppress fraud against gaming machines.

  According to the present invention, it is possible to appropriately monitor the low-frequency near electromagnetic field arriving at the proximity switch, and it is possible to suppress malfunction of the proximity switch caused by the approach of the low-frequency near electromagnetic field. It is possible to suppress fraud against the machine.

It is a figure explaining the structural example of the pachinko game machine provided with the abnormality detection part which consists of a low frequency near electromagnetic field sensor to which the present invention is applied. It is a figure explaining the structural example of the abnormality detection part of FIG. It is side surface sectional drawing explaining the structural example of the game ball detection part of FIG. 1, and an abnormality detection part. It is a block diagram explaining the structural example of a game ball detection part and an abnormality detection part. It is a figure explaining the range influenced by a low frequency electromagnetic field with respect to a game ball detection part and an abnormality detection part. It is a flowchart explaining an abnormality detection process. It is a figure explaining the other structural example of an abnormality detection part. It is a figure explaining the other structural example of an abnormality detection part. It is a figure which shows the structural example of the game ball detection switch which integrated the game ball detection part and the abnormality detection part. It is a figure which shows the structural example of the coil spool of FIG. It is a figure which shows the example of a setting of the conductance of the game ball detection part of FIG. 9, and an abnormality detection part. It is a figure explaining operation | movement of the game ball detection switch of FIG. It is a figure explaining operation | movement of the game ball detection switch of FIG. It is a figure which shows the other structural example of the game ball detection switch which integrated the game ball detection part and the abnormality detection part. It is a figure explaining operation | movement of the game ball detection switch of FIG. It is a figure which shows the other structural example of the coil spool of FIG.

  Embodiments of the present invention will be described below. Correspondences between the configuration requirements of the present invention and the embodiments described in the detailed description of the present invention are exemplified as follows. This description is to confirm that the embodiments supporting the present invention are described in the detailed description of the invention. Accordingly, although there are embodiments that are described in the detailed description of the invention but are not described here as embodiments corresponding to the constituent elements of the present invention, It does not mean that the embodiment does not correspond to the configuration requirements. Conversely, even if an embodiment is described here as corresponding to a configuration requirement, that means that the embodiment does not correspond to a configuration requirement other than the configuration requirement. It's not something to do.

  That is, the low-frequency near electromagnetic field detection sensor (for example, the abnormality detection unit 2 in FIG. 4) according to one aspect of the present invention is mounted on the pachinko gaming machine, and the first high-frequency oscillation circuit (for example, the high-frequency oscillation circuit in FIG. 4). 221), a low-frequency near electromagnetic field detection sensor used in combination with a proximity switch for detecting a game ball (for example, the game ball detection unit 2 in FIG. 4), which is very similar to the first high-frequency oscillation circuit A second high-frequency oscillation circuit (for example, high-frequency oscillation circuit 211 in FIG. 4) that oscillates a high-frequency signal in a band, and a coil (for example, coil L1 in FIG. 4) that detects the arrival of a low-frequency near electromagnetic field by voltage induction. And an LC resonance circuit (for example, LC resonance circuit 201 in FIG. 4) in which the resonance frequency is set to be very similar to the resonance frequency of the proximity switch, and a part of the coil surface Siege In addition, a shield member (for example, the shield member 21 in FIG. 4) having an opening other than the above-mentioned part, and an oscillation stop unit (for example, FIG. 4) for setting the oscillation state of the second high-frequency oscillation circuit. Sensitivity adjustment resistor R1) and oscillation detection means (for example, the discrimination circuit 212 in FIG. 4) for detecting oscillation of the second high-frequency oscillation circuit. When it is not irradiated, the oscillation of the second high-frequency oscillation circuit is stopped, and when the electromagnetic field near the low frequency is irradiated, the second high-frequency oscillation circuit is oscillated.

  In the LC resonance circuit, a proximity switch that detects the game ball has a coil (for example, the coil L1 in FIG. 4) larger than the induction component of the coil of the LC resonance circuit (for example, the coil L2 in FIG. 4), and In addition, a capacitor (for example, capacitor C1 in FIG. 4) having a smaller capacitance component than a capacitor (for example, capacitor C2 in FIG. 4) included in the proximity switch that detects the game ball is included, and the LC resonance circuit The resonance frequency by the coil and the capacitor can be set to be very similar to the resonance frequency by the coil and the capacitor of the LC resonance circuit included in the proximity switch that detects the game ball.

  The oscillation stopping means (for example, the sensitivity adjustment resistor R1 in FIG. 4) can be set to have a negative conductance so as to stop the oscillation of the second high-frequency oscillation circuit. Negative conductance can be set by setting a constant.

  The oscillation stop means sets a negative conductance so as to stop the oscillation of the high-frequency oscillation circuit by fixing a metal lump (for example, a metal lump 501 in FIG. 7) in the detection region of the coil. Can be.

Hereinafter, the best mode for carrying out the invention (hereinafter referred to as an embodiment) will be described. The description will be given in the following order.
1. 1st Embodiment (example which arrange | positions the through-hole of a game ball detection part and an abnormality detection part coaxially)
2. Second embodiment (example in which a game ball detection unit and an abnormality detection unit are separately provided)
3. Third Embodiment (Example of a game ball detection switch in which a game ball detection unit and an abnormality detection unit are integrated)
4). Fourth Embodiment (Example of measures against mutual interference of coils using diodes)
5. Fifth embodiment (example of measures against mutual interference of coils by a shield member)

<1. First Embodiment>
[Configuration example of an embodiment of a pachinko gaming machine including an abnormality detection unit including a low-frequency near electromagnetic field sensor to which the present invention is applied]
FIG. 1 shows a configuration example of a part for detecting the passage of a game ball in a pachinko gaming machine provided with an abnormality detection unit composed of a low-frequency near electromagnetic field sensor to which the present invention is applied. That is, the game ball 3 of FIG. 1 needs to be counted, for example, inserted into a chucker called a tulip or paid out.

  The game ball detector 2 is provided with a through-hole 2 a having substantially the same diameter as the game ball 3. In addition, the abnormality detection unit 1 is provided with a through-hole 1a having substantially the same diameter coaxially with the through-hole 2a of the game ball detection unit 2.

  When the uppermost game ball 3 in the figure passes through the through-hole 2a of the game ball detection unit 2, the game ball detection unit 2 detects the passage of the game ball 3 and outputs a corresponding signal. Further, when the game ball 3 passes through the through hole 2 a of the game ball detection unit 2, the game ball 3 passes through the through hole 1 a of the abnormality detection unit 1. Although the abnormality detection unit 1 is provided with the through hole 1a, it only allows the game ball 3 to pass therethrough and does not detect the passage of the game ball 3. The abnormality detection unit 1 detects the arrival of a low-frequency near electromagnetic field, and outputs a corresponding signal when detecting this.

[Configuration example of game ball detection unit and abnormality detection unit]
Next, referring to FIGS. 2 and 3, a configuration example around the through-hole 1 a of the abnormality detection unit 1 will be described.

  As shown in FIG. 2, the through hole 1 a is specifically configured by a cylindrical coil spool 11. As shown in FIGS. 2 and 3, the coil spool 11 is provided with a groove in the outer peripheral direction of the outer side surface, and the coil L <b> 1 is embedded by winding a copper wire in an annular shape a plurality of times along the groove. It has a structured. The shield member 21 is provided at the bottom of the main body of the abnormality detection unit 1 and has an annular shape and is provided with an annular groove having the same width as that of the coil spool above the coil member. By fitting the spool 11, the coil L1 is surrounded and the electromagnetic field is shielded. More specifically, the groove of the shield member 21 has substantially the same diameter and the same shape as the cylindrical bottom portion of the coil spool 11, and the cylindrical bottom portion of the coil spool 11 fits into the groove of the shield member 21. It has become.

  Although not shown in FIG. 2, the structure around the through hole 2a of the game ball detector 2 is basically configured in the same manner as the structure around the through hole 1a. That is, in the configuration around the through-hole 2a, a coil spool 111, a shield member 121, and a coil L2 are provided instead of the coil spool 11, the shield member 21, and the coil L1. However, the shield member 121 has a configuration in which the height of the cylindrical outer side surface is higher than that of the shield member 21, and is configured to surround the coil L2 from the outer peripheral side to the substantially upper portion, and the axial direction of the coil winding of the coil L2 In contrast, the opening is configured to be smaller. In other words, the shield member 21 is provided only to a position lower than the shield member 121 in the height direction, and the exposed portion on the outer peripheral side of the coil L1 is wide and the opening is large. ing. The coil L1 has a structure in which the number of windings is larger than that of the coil L2.

  As shown in FIG. 3, a signal processing unit 32 is provided on the substrate 31 in the right direction of the coil spool 11 of the abnormality detection unit 1 in the drawing. Similarly, a signal processing unit 132 is provided on the substrate 131 in the right direction of the coil spool 111 of the game ball detection unit 2 in the drawing. The signal processing unit 32 detects the arrival of a low-frequency near electromagnetic field based on the voltage induced by the coil L1, and supplies a signal corresponding to the detection result to the control unit 301 (FIG. 4). The signal processing unit 132 detects the passage of the game ball based on the voltage induced by the coil L2, and supplies a signal corresponding to the detection result to the control unit 301 (FIG. 4).

[Example of functional configuration realized by abnormality detection unit and game ball detection unit]
Next, functions realized by the abnormality detection unit 1 and the game ball detection unit 2 will be described with reference to FIG.

  The abnormality detection unit 1 includes a coil L1 that functions as an antenna, and a signal processing unit 32. The signal processing unit 32 includes a capacitor C1, a high-frequency oscillation circuit 211, a discrimination circuit 212, and an output circuit 213. The signal processing unit 32 detects a low-frequency near electromagnetic field based on a signal from the coil L1, and controls the detection result. 301 is supplied. More specifically, both ends of the capacitor C1 are connected in parallel with the coil L1, and the end portion that becomes the upper voltage is connected to the high-frequency oscillation circuit 211, and the end portion that becomes the lower voltage is grounded. The high-frequency oscillation circuit 211 is grounded while being supplied with power from a power source, and is further grounded via the sensitivity adjustment resistor R 1, and outputs an oscillation output to the discrimination circuit 212. The discrimination circuit 212 is supplied with power from the power supply and is grounded, compares the oscillation output supplied from the high-frequency oscillation circuit 211 with a predetermined threshold value, and supplies the comparison result to the output circuit 213. The output circuit 213 is supplied with power from the power source and is grounded, detects a low-frequency near electromagnetic field based on the comparison result of the discrimination circuit 212, and outputs the detection result as a signal V1 to the control unit 301.

  The high-frequency oscillation circuit 211 is set in an oscillation stop state in a normal state, and is set so as to shift to an oscillation state only when the coil L1 is exposed to a low-frequency near electromagnetic field. More specifically, the conductance gL1 of the LC resonance circuit 201 and the conductance gi1 of the high-frequency oscillation circuit 211 are based on the Nyquist oscillation condition, and in the following formula (1), the high-frequency oscillation circuit 211 is in an oscillation stop state. In the case of Equation (2), the high-frequency oscillation circuit 211 is always in an oscillation state.

gL1> gi1
... (1)

gL1 <gi1
... (2)

  Therefore, by adjusting the resistance value of the sensitivity adjustment resistor R1, the conductance gi1 of the high-frequency oscillation circuit 211 is set to be smaller than the conductance gL1 of the LC resonance circuit 201, that is, the sensitivity adjustment resistor R1 is set to a larger value, The conductance gi1 of the circuit 211 is set to be small. As a result, since the relationship of the above-described formula (1) can be maintained, the high-frequency oscillation circuit 211 is in an oscillation stop state when the coil L1 is not exposed to the low-frequency near electromagnetic field. At this time, since the high-frequency oscillation circuit 211 is not performing an oscillation operation, a value smaller than the threshold value is supplied to the discrimination circuit 212, so that the discrimination circuit 212 indicates that no oscillation operation is performed. The signal is supplied to the output circuit 213. As a result, the output circuit 213 outputs a signal indicating that the output circuit 213 is not exposed to the low-frequency near electromagnetic field to the control unit 301.

  On the other hand, the coil L1 induces a sine wave voltage by being exposed to a low-frequency near electromagnetic field. At this time, in the vicinity of the resonance point of the LC resonance circuit 201, the conductance gL1 decreases and shifts from the state of the above equation (1) to the state of the equation (2), so that the high frequency oscillation circuit 211 starts steady oscillation. Then, the oscillation output is output to the discrimination circuit 212. At this time, since a value larger than the threshold value is supplied to the discrimination circuit 212, the discrimination circuit 212 supplies a signal indicating that the oscillation operation is performed to the output circuit 213. As a result, the output circuit 213 outputs a signal indicating that it is exposed to the low-frequency near electromagnetic field to the control unit 301.

  The game ball detection unit 2 is configured in substantially the same manner as the abnormality detection unit 1 and includes a coil L2 and a signal processing unit 132. The signal processing unit 132 includes a capacitor C2, a high-frequency oscillation circuit 221, a discrimination circuit 222, and an output circuit 223. The signal processing unit 132 detects the passage of the game ball 3 based on the signal of the coil L2, and controls the detection result. 301 is supplied. More specifically, both ends of the capacitor C2 are connected in parallel with the coil L2, and the end portion that becomes the upper voltage is connected to the high-frequency oscillation circuit 221 and the end portion that becomes the lower voltage is grounded. The high-frequency oscillation circuit 221 is grounded while being supplied with power from a power supply, and is further grounded via a sensitivity adjustment resistor R2, and outputs an oscillation output to the discrimination circuit 222. The discrimination circuit 222 is supplied with power from the power source and is grounded, compares the oscillation output supplied from the high-frequency oscillation circuit 221 with a predetermined threshold value, and supplies the comparison result to the output circuit 223. The output circuit 223 is supplied with power from the power source and is grounded, detects the passage of the game ball 3 based on the comparison result of the discrimination circuit 222, and outputs the detection result to the control unit 301 as a signal V2.

  Note that the high-frequency oscillation circuit 221 is set to be in an oscillation stop state when the game ball 3 is in a passing state, and is set to shift to an oscillation state only when the game ball 3 is not passing through. More specifically, the conductance gL2 of the LC resonance circuit 202 and the conductance gi2 of the high-frequency oscillation circuit 221 are based on the Nyquist oscillation condition, and the high-frequency oscillation circuit 221 is in an oscillation stop state in the following equation (3). In the case of Equation (4), the high-frequency oscillation circuit 221 is always in an oscillation state.

gL2> gi2
... (3)

gL2 <gi2
... (4)

  Therefore, by adjusting the resistance value of the sensitivity adjustment resistor R2, the conductance gi2 of the high-frequency oscillation circuit 221 is set to be smaller than the conductance gL2 of the LC resonance circuit 202, that is, the sensitivity adjustment resistor R2 is set to be small, and high-frequency oscillation is performed. The conductance gi2 of the circuit 221 is set larger. As a result, since the relationship of the above-described formula (4) can be maintained, the high-frequency oscillation circuit 221 always oscillates when the game ball 3 is not passing. At this time, since the high-frequency oscillation circuit 221 performs an oscillation operation, a value larger than the threshold value is supplied to the discrimination circuit 222, and the discrimination circuit 222 indicates that the oscillation operation is being performed. Is supplied to the output circuit 223. As a result, the output circuit 223 outputs a signal indicating that the game ball 3 has not passed to the control unit 301.

  On the other hand, since the conductance gL2 rises when the game ball 3 passes through the coil L2, and the state of the equation (4) shifts to the state of the equation (3), the high frequency oscillation circuit 221 oscillates. It stops and outputs the oscillation output to the discrimination circuit 222. At this time, since a value smaller than the threshold value is supplied to the discrimination circuit 212, the discrimination circuit 222 supplies a signal indicating that the oscillation operation is not performed to the output circuit 213. As a result, the output circuit 213 outputs a signal indicating that the game ball 3 has not passed to the control unit 301.

  Further, the number of turns of the coil L1 is larger than the number of turns of the coil L2, but in order to unify the resonance frequencies of the LC resonance circuits 201 and 202, the capacitance of the capacitor C2 is larger than that of the capacitor C1. Is set to be small and satisfies the relationship of the following formula (5).

L1 × C1 = L2 × C2
... (5)

  Here, L1 and L2 are the inductances of the coils L1 and L2, respectively, and C1 and C2 are the respective capacitances of the capacitors C1 and C2. As a result, since the resonance frequencies of the LC resonance circuits 201 and 202 are set to values that are very similar to each other, an abnormality can be reliably detected with respect to the induced electromagnetic wave in the same band as the induced electromagnetic wave that affects the game ball detector 2. Since the radio waves that do not affect the game ball detection unit 2 can be reliably undetected, an abnormal state due to other factors can hardly be erroneously detected.

  Further, as shown in FIGS. 3 and 4, the shield members 21 and 121 are located in the region where the coil L2 is shielded by the shield member 121 rather than the region where the coil L1 is shielded by the shield member 21. Widely set. Moreover, the area | region which is not shielded by the shielding members 21 and 121 is set so that the directivity may become common also from the point by which the through-holes 1a and 2a are provided coaxially. In FIG. 4, a dotted arrow indicates the arrival direction of the external electromagnetic field.

  With such a configuration, the coil L1 has more turns than the coil L2, and the opening of the coil L1 by the shield member 21 is set wider than the opening of the coil L2 by the shield member 121. Therefore, as shown in FIG. 5, the ranges Z2-1 and Z2-2 in which the low-frequency electromagnetic field can be detected by the abnormality detection unit 1 are affected by the low-frequency electromagnetic field of the game ball detection unit 2. The receiving ranges Z1-1 and Z1-2 can be configured to be completely included, and the sensitivity of the abnormality detection unit 1 can be increased more than that of the game ball detection unit 2.

  Note that FIG. 5 is a one-dot chain line in which the abnormality detection unit 1 and the game ball detection unit 2 are arranged one above the other, and the low-frequency near electromagnetic field can be detected by the abnormality detection unit 1 when viewed from the side surface direction. It is a figure which shows the range Z1-1 and Z1-2 shown by the dotted line where the shown range Z2-1 and Z2-2 and the game ball | bowl detection part 2 are influenced by a low frequency near electromagnetic field. Here, in FIG. 5, the upper ranges Z1-1 and Z2-1 are both larger than the ranges Z1-2 and Z2-2 because the shield members 21 and 121 are both larger. This is because the opening is set wider than the upper part. Further, ranges Z2-1 and Z2-2 in which the low-frequency electromagnetic field can be detected by the abnormality detection unit 1, and ranges Z1-1 and Z1-2 in which the game ball detection unit 2 is affected by the low-frequency electromagnetic field However, the reason why they are configured in a substantially similar shape and coaxially is that the directivity of the openings of the shield members 21 and 121 is unified, and only the sizes of the openings are different.

  As a result, the abnormality detection unit 1 can detect the low-frequency near electromagnetic field at a timing before the game ball detection unit 2 is affected by the low-frequency near electromagnetic field. At a timing before malfunction occurs, it is possible to take a countermeasure in consideration of the influence of the low-frequency near electromagnetic field, and it is possible to suppress fraud using the low-frequency near electromagnetic field.

[Abnormality detection processing]
Next, the abnormality detection process will be described with reference to the flowchart of FIG.

  In step S1, the discrimination circuit 212 determines whether or not the amplitude of the oscillation output of the high frequency oscillation circuit 211 is greater than a predetermined value. That is, when the low-frequency near electromagnetic field does not affect the coil L1, no sinusoidal voltage is induced, so that the resonance action by the LC resonance circuit 201 does not occur, and the high-frequency oscillation circuit 211 does not oscillate. For this reason, since the amplitude of the oscillation output of the high-frequency oscillation circuit 211 does not become larger than the predetermined value, the process of step S1 is repeated. At this time, the discrimination circuit 212 is in a state of outputting, for example, a low signal of the ground potential to the output circuit 213. As a result, during this time, the output circuit 213 outputs, for example, a Low signal having the same value as the ground potential to the control unit 301 as the signal V1 indicating that the low-frequency near electromagnetic field is not detected.

  On the other hand, in step S1, when a low-frequency near electromagnetic field affects the coil L1, a sinusoidal voltage is induced, so that a resonance action is generated by the LC resonance circuit 201. Therefore, the high-frequency oscillation circuit 211 generates an oscillation output. To start. For this reason, since the amplitude of the oscillation output of the high-frequency oscillation circuit 211 becomes larger than a predetermined value, the process proceeds to step S2.

  In step S2, the discrimination circuit 212 detects an amplitude higher than a predetermined value, and for example, as a signal V1 indicating that a low-frequency near electromagnetic field is detected as an abnormal state, a Hi signal having the same value as the power supply voltage is detected. Is supplied to the output circuit 213.

  In step S <b> 3, the output circuit 213 outputs, for example, a Hi signal of the power supply potential as a signal indicating that the low-frequency near electromagnetic field that is in an abnormal state is detected to the control unit 301.

  In step S <b> 11, the control unit 301 determines whether or not the signal V <b> 1 indicating that an abnormality is detected is supplied from the abnormality detection unit 1, and processing is performed until a signal indicating abnormality is supplied. repeat.

  In step S11, for example, when the signal V1 indicating that the low-frequency near electromagnetic field is detected is supplied by the processing in step S3, in step S12, the control unit 301 All the signals V2 supplied from the game ball detector 2 are fixed to invalid signals. That is, the operation in the game ball detection unit 2 in the state where the low-frequency near electromagnetic field is detected is considered to be an abnormal operation in which the low-frequency near electromagnetic field is generated by, for example, a malicious third party. In the meantime, the signal V2 output from the game ball detector 2 is treated as an invalid signal. Alternatively, the control unit 301 can identify that the signals are supplied under the condition that the low-frequency near electromagnetic field is detected in association with the signal V2 output from the game ball detection unit 2. And information that can be confirmed later as a result of detecting the game ball in an abnormal state is recorded.

  In step S13, the control unit 301 controls the reporting unit 301a in FIG. 4, and from the reporting output unit 302 provided with a display function such as an LCD (Liquid Crystal Display) and a voice output function such as a speaker. Information indicating that a low-frequency near electromagnetic field is detected is presented to the inside of the gaming machine or the outside of the gaming machine by an image or sound.

  Through the above processing, it is possible to detect a low-frequency near electromagnetic field that has a high possibility of affecting the game ball detection unit 2 at a timing before the game ball detection unit 2 is affected. In addition, if a low-frequency near electromagnetic field is detected, it is notified that an abnormality due to the low-frequency near electromagnetic field has occurred, and may be affected by the low-frequency near electromagnetic field, or may be affected in the future. It is possible to take measures such as recording the fact that the game ball detection result of the game ball detection unit 2 with high reliability is a detection result with low reliability, or ignoring the detection result, and in the vicinity of the low frequency It is possible to suppress fraud using electromagnetic fields.

<2. Second Embodiment>
[Example of configuration in which a game ball detection unit and an abnormality detection unit are separately arranged]
In the above, as in the case of the through hole 2a of the game ball detection unit 2, the configuration example in which the through hole 1a is provided in the abnormality detection unit 1 and the game ball 3 is passed has been described. As shown in the figure, a metal lump 501 having substantially the same diameter as that of the through-hole 1a is inserted into the through-hole 1a of the abnormality detecting unit 1 to forcibly increase the conductance gL1 of the LC resonance circuit 201. By satisfying the above-described equation (1), the high-frequency oscillation circuit 211 may be set in an oscillation stopped state under a condition where it is not exposed to a low-frequency near electromagnetic field.

  In such a case, the abnormality detection unit 1 has no through-hole 1a, so that the game ball 3 cannot pass therethrough. Therefore, in such a case, for example, as shown in FIG. 8, the range that is right next to the game ball detection unit 2 and that can detect an abnormality is affected by the low-frequency electromagnetic field of the game ball detection unit 2. You may make it arrange | position the abnormality detection part 1 in the position which can include the range to receive, or the position which can be substantially included.

  In addition, since there are metal game ball launch rails, frame grounds, molded products with metal plating for decoration, etc. on the gaming machine board surface, when a low frequency near electromagnetic field is irradiated Eddy currents are generated at the irradiation point, and secondary electromagnetic waves are generated. Therefore, by arranging the abnormality detection unit 1 so that these secondary electromagnetic waves can be detected, it is possible to further expand the detection range and more reliably detect the low-frequency near electromagnetic field. Therefore, fraudulent acts can be suppressed.

<3. Third Embodiment>
[Example of configuration in which the game ball detection unit and the abnormality detection unit are integrated into one structure]
In the above description, an example in which the abnormality detection unit 1 and the game ball detection unit 2 are configured separately and used in combination with each other has been described. However, the structure is integrated and the coil spool is shared. It may be.

  FIG. 9 shows a configuration example of a game ball detection switch in which the abnormality detection unit 1 and the game ball detection unit 2 are integrated. In the game ball detection switch 401 of FIG. 9, the same reference numerals are given to the components having the same functions as those of the abnormality detection unit 1 and the game ball detection unit 2 in FIG. Shall be omitted. In other words, the game ball detection switch 401 in FIG. 9 is different from the abnormality detection unit 1 and the game ball detection unit 2 in FIG. 4 in that resonance circuits 411 and 412 are provided instead of the resonance circuits 201 and 202. The shield members 21 and 121 are removed. Although a shield member may be required for measures such as environmental change, an example of mounting the shield member in this configuration example will be described later with reference to FIG.

  The resonance circuits 411 and 412 are configured by a coil L11 and a capacitor C11, and a coil L12 and a capacitor C12, respectively. Further, as shown in FIG. 10, the coils L11 and L12 are both wound around a common coil spool 421. The coil spool 421 includes a through hole 421a having substantially the same diameter as the through holes 1a and 2a in FIG. 1 and allows the game ball 3 to pass therethrough.

  The structures and functions of the coils L11 and L12 and the capacitors C11 and C12 are the same as those of the coils L1 and L2 and the capacitors C1 and C2, but the inductance and capacitance, and the sensitivity of each of the corresponding oscillation circuits 211 and 221 are the same. The setting method of the adjustment resistors R1 and R2 is different.

  That is, the relationship between the conductances gL1 and gL2 of the resonance circuits 411 and 412 and the distance d between the game ball 3 and the through surface of the through hole 421a is the relationship indicated by the curve gL in FIG.

  As shown in FIG. 11, the conductances gL1 and gL2 of the resonance circuits 411 and 412 are small as the distance d is small and approach the through hole 421a, and are large as the distance d is large and small as they are separated. Therefore, in the abnormality detection unit 1, the resistance value of the sensitivity adjustment resistor R1 is set to be large, the conductance gi1 of the oscillation circuit 211 is reduced, and the formula (1) regardless of the distance between the game ball 3 and the penetrating surface. Is maintained, and the oscillation circuit 211 is set to be in an oscillation stop state.

  On the other hand, in the game ball detection unit 2, when the resistance value of the sensitivity adjustment resistor R2 is set to be small and the distance between the game ball and the through surface becomes a predetermined value d1, the equations (3) and (4) are After switching, the oscillation circuit 221 is set so that the oscillation stop state and the constant oscillation state are switched.

  As a result, for example, when it is not exposed to the low-frequency near electromagnetic field, the input voltage Vx of the resonance circuit 411 of the game ball detection unit 2 depends on whether or not the through-hole 421a of the game ball 3 has passed. Changes as indicated by. That is, at times t0 to t1, t2 to t3, and after t4 when the game ball 3 does not pass, the state of the above-described equation (4) is maintained and the oscillation state is always set. Therefore, when the discrimination voltage in the discrimination circuit 222 is set to a voltage V12 that is an intermediate potential between the peak value of the input voltage Vx and the 0V voltage, the voltage becomes lower than the discrimination voltage (in FIG. 12, the voltage V12 is set to the negative side). The discrimination circuit 222 outputs a corresponding Hi discrimination result. In response to this, the output circuit 223 outputs the signal V2 as a Hi signal indicating that the game ball 3 has not passed.

  Conversely, at times t1 to t2 and t3 to t4 when the game ball 3 passes, the state of the above-described formula (3) is maintained and the oscillation is stopped. For this reason, as shown in the second stage from the top in FIG. 12, since it does not become lower than the voltage V12 that is the discrimination potential, the discrimination circuit 222 outputs a corresponding Low discrimination result. In response to this, the output circuit 223 outputs the signal V2 as a Low signal indicating that the game ball 3 is passing.

  At this time, in the abnormality detection unit 1, since the coil L12 oscillates a weak mutual interference wave caused by the induced voltage of the coil L11, as shown in the third stage of FIG. Vy generates a high-frequency signal substantially in synchronization with the input voltage Vx. However, since this peak value is small, by setting the voltage V11 that is larger in absolute value than this peak value as the discrimination threshold of the discrimination circuit 212, the discrimination circuit 212 can generate a low-frequency near electromagnetic field in any case. A Low signal indicating that there is no signal is output. Accordingly, as shown in the fourth stage of FIG. 12, at any timing, the output circuit 213 outputs the signal V1 as a Low signal indicating that no low-frequency near electromagnetic field is generated.

  On the other hand, when a low-frequency near electromagnetic field is generated, the input voltage Vx of the oscillation circuit 221 of the game ball detector 2 has a waveform as shown in the uppermost stage of FIG. That is, when the low-frequency near electromagnetic field is not generated as at times t0 to t13, the same behavior as the waveform in FIG. However, as shown after time t13, when a low frequency near electromagnetic field is generated, the input voltage Vx is not passed through the game ball 3 due to resonance of the low frequency near electromagnetic field, and time t15 to time t15. From c to t16, the peak value rises to the power supply voltage of the oscillation circuit 221. At this time, the behavior of the voltage Vx when the game ball 3 passes maintains a certain wave height, although a slight decrease in amplitude is observed. As a result, after time t13 when the low-frequency near electromagnetic field is generated, a signal lower than the discrimination threshold voltage V12 is output regardless of whether or not the game ball 3 has passed. Outputs a Hi signal indicating that the game ball 3 has not passed as the signal V2.

  At this time, in the abnormality detection unit 1, the input voltage Vy of the oscillation circuit 211 at the timing up to time t13 until the low-frequency near electromagnetic field is generated, as shown in the third stage of FIG. Behaves as in. However, after time t13 when the low-frequency near electromagnetic field is generated, the peak value rises to the power supply voltage of the oscillation circuit 211 along with the resonance caused by the low-frequency near electromagnetic field, and the state is maintained. For this reason, since a signal lower than the voltage V11 that is the discrimination threshold is output, as shown in the fourth stage of FIG. 13, the output circuit 213 outputs the signal V1 in the vicinity of the low frequency after time t13. A Hi signal indicating that an electromagnetic field is generated is output.

  As a result, the control unit 301 can recognize the generation of the low-frequency near electromagnetic field based on the signal V1. That is, as shown at times t14 to t15 in the second stage of FIG. 13, even if the game ball 3 passes, the game ball 3 does not pass as shown at times t13 to t14 and after t15. However, the signal V2 is Hi, and in any case, the malfunction occurs as the game ball 3 does not pass (see the malfunction area in the figure). However, since the control unit 301 detects the generation of a low-frequency near electromagnetic field when the signal V1 is Hi, it is possible to prevent erroneous detection. That is, when the signal V1 is Hi and the occurrence of a low-frequency near electromagnetic field is detected, the signal V2 is invalidated regardless of whether or not the game ball 3 has passed. Detection can be prevented.

  12 and 13 (including the subsequent FIG. 15), the uppermost stage shows the waveform of the input voltage Vx of the oscillation circuit 221, and the second stage is the signal V2 that is the output signal of the output circuit 223. The waveform is shown. 12 and 13, the third stage shows the waveform of the input voltage Vy of the oscillation circuit 211, and the lowermost stage shows the waveform of the signal V <b> 1 that is the output signal of the output circuit 213. Show. Furthermore, the range drawn in the vertical stripe shape in the top and third waveform shows that the waveform is sufficiently high frequency in the time direction on the horizontal axis. The outer shape is displayed so as to be an envelope of the oscillation wave height.

<4. Fourth Embodiment>
[Configuration example of adding a diode when the game ball detection unit and the abnormality detection unit are integrated]
In the above description, the case where the game ball detection unit and the abnormality detection unit are integrated is described. However, in this case, the coils L11 and L12 are provided in the common coil spool 421, thereby causing an influence due to mutual interference. . That is, the waveform of the input voltage Vy of the oscillation circuit 211 of the abnormality detection unit 1 at the timing when the game ball 3 shown in the third stage of FIGS. 12 and 13 does not pass is generated due to the induced voltage of the coil L12. It is an interference wave of the coil L11 to do. For this reason, if a peak value lower than the voltage V11 that is the discrimination threshold voltage is generated due to interference, the abnormality detection unit 1 may malfunction.

  Therefore, the reference voltage of the input voltage Vy of the oscillation circuit 211 in the abnormality detection unit 1 is shifted by a diode so that the reference voltage is higher than the voltage V11 that is the discrimination threshold value of the discrimination circuit 212 by the abnormality detection unit 1. May be prevented.

  FIG. 14 shows a configuration example of the game ball detection switch 401 in which the diode D1 is provided in the previous stage of the oscillation circuit 211 of the abnormality detection unit 1 so as to prevent the influence of the interference wave. In the game ball detection switch 401 of FIG. 14, the same reference numerals are given to the components having the same functions as those of the game ball detection switch 401 of FIG. 9, and the description thereof will be omitted as appropriate. That is, the game ball detection switch 401 in FIG. 14 is different from the game ball detection switch 401 in FIG. 9 in that a diode D 1 is provided in the previous stage of the oscillation circuit 211.

  The cathode of the diode D1 is connected to one end of the coil L11 and one end of the capacitor C11, and the anode is connected to the oscillation circuit 211 as the input voltage Vy.

  With such a configuration, for example, as shown in the third stage of FIG. 15, the input voltage Vy of the oscillation circuit 211 of the abnormality detection unit 1 is the discrimination threshold of the discrimination circuit 212 by the forward potential Vd of the diode D1. Shifted away from a certain voltage V11. As a result, as shown at times t0 to t31 and t32 to t33, the peak values of the mutual interference waves of the coils L11 and L12 when the game ball 3 is not passed without being exposed to the low-frequency near electromagnetic field. However, it is possible to make it difficult to fall below the voltage V11.

  As a result, the abnormality detection unit 1 can prevent malfunction due to mutual interference waves. In FIG. 15, the waveforms at the top, second, and fourth stages are the same as those in FIG. Further, the configuration of the diode is not limited to a single stage as shown in FIG. 14, and the influence of mutual interference can be further reduced by shifting to a higher potential from the discrimination threshold by employing a multi-stage configuration. You may do it.

<5. Fifth embodiment>
[Configuration example of adding a shield member when the game ball detection unit and the abnormality detection unit are integrated]
In the above, the example of reducing the influence of the mutual interference wave by the diode has been described. However, the mutual interference wave itself between the coils L11 and L12 is reduced to prevent the malfunction due to the mutual interference wave. Good.

  FIG. 16 shows a configuration example of a coil spool in which the coil L12 of the game ball detection unit 2 is surrounded by a shield member.

  That is, instead of the coil spool 421, a coil spool 453 is provided, and the coils L11 and L12 are shared, and the shield member 451 surrounds the coil L12 so that the portion of the coil L12 is hidden from above. Further, a groove 453a is provided between the coils L11 and L12 of the coil spool 453, and a shield member 452 is fitted between both the coils, so that the coil L12 is surrounded by the shield members 451 and 452, and interference waves hardly leak. To do.

  With such a configuration, it is possible to reduce the influence of mutual interference on the coil L11 due to the induced voltage generated by the coil L12, and it is possible to prevent malfunction due to mutual interference between the coils L11 and L12.

  16 is a side sectional view in the vicinity of the coil spool 453, and the lower portion is an exploded perspective view in the vicinity of the coil spool 453.

  As described above, according to the present invention, the low-frequency near electromagnetic field can be detected by the low-frequency near electromagnetic field generated inside the pachinko gaming machine at a timing before the malfunction of the game ball detection switch occurs. In addition, it is possible to appropriately monitor the low-frequency near electromagnetic field and to appropriately suppress the malfunction of the game ball detection switch.

  In this specification, the processing of each step constituting the flowchart is not limited to the processing performed in time series in the order described, but of course, it is not necessarily performed in time series, either in parallel or individually. This includes processing to be executed.

DESCRIPTION OF SYMBOLS 1 Abnormality detection part 2 Game ball | bowl detection part 3 Game ball | bowl 11 Coil spool 21 Shield member 31 Substrate 32 Signal processing part 111 Coil spool 121 Shield member 131 Substrate 132 Signal processing part 201, 202 Resonance circuit 211 High frequency oscillation circuit 212 Discrimination circuit 213 Output Circuit 221 High-frequency oscillation circuit 222 Discrimination circuit 223 Output circuit 301 Control unit L1, L2 Coil C1, C2 Capacitor R1, R2 Sensitivity adjustment resistor

Claims (10)

A low-frequency near electromagnetic field detection sensor that is mounted on a pachinko gaming machine and includes a first high-frequency oscillation circuit and used in combination with a proximity switch that detects a game ball,
A second high-frequency oscillation circuit that oscillates a high-frequency signal in a band corresponding to the first high-frequency oscillation circuit;
A coil that detects the arrival of an electromagnetic field in the vicinity of a low frequency by inducing voltage,
An LC resonance circuit including the coil and having a resonance frequency set to be a frequency corresponding to the resonance frequency of the proximity switch;
A shield member surrounding a part of the coil surface and opening another part different from the part;
Oscillation stop means for setting an oscillation state of the second high-frequency oscillation circuit;
Oscillation detection means for detecting oscillation of the second high-frequency oscillation circuit,
The oscillation stopping means is
When the low-frequency near electromagnetic field is not irradiated, the oscillation of the second high-frequency oscillation circuit is stopped,
When the low-frequency near electromagnetic field is irradiated, the second high-frequency oscillation circuit is oscillated,
The LC resonant circuit is:
A proximity switch that detects the game ball includes a coil that is larger than the inductive component of the coil of the LC resonance circuit, and a capacitor that has a smaller capacitance component than the capacitor that the proximity switch that detects the game ball has,
A low-frequency near electromagnetic field detection sensor, wherein a resonance frequency by a coil and a capacitor of the LC resonance circuit is set to be a resonance frequency by a coil and a capacitor of the LC resonance circuit included in a proximity switch that detects the game ball. By setting the detection directivity of the low-frequency near electromagnetic field detection sensor according to the opening direction of the shield member, and by setting the detection area of the low-frequency near electromagnetic field detection sensor according to the size of the opening, The low-frequency near electromagnetic field detection sensor according to claim 1, wherein the detection region of the low-frequency near electromagnetic field detection sensor includes a region in which a malfunction occurs due to the low-frequency near electromagnetic field of a proximity switch that detects the game ball. The oscillation stopping means is
A negative conductance is set so as to stop the oscillation of the second high-frequency oscillation circuit;
Low-frequency electromagnetic field near the detection sensor according to claim 1 or 2 to set the negative conductance by constant setting of the sensitivity adjustment resistor. The oscillation stopping means is
The low-frequency near electromagnetic field detection according to claim 1 or 2 , wherein a negative conductance is set so as to stop the oscillation of the high-frequency oscillation circuit by fixedly installing a metal block in the detection region of the coil. Sensor. The first LC resonance circuit including the first coil and the first capacitor through which the game ball passes, and the voltage induced in the first coil that the game ball has passed through the first coil. And a proximity switch including a first signal processing unit that detects when the oscillation at the first resonance frequency defined by the first LC resonance circuit stops, and is mounted on a pachinko gaming machine. Near-frequency electromagnetic field detection sensor,
A second LC resonant circuit including a second coil corresponding to the first coil and a second capacitor corresponding to the first capacitor;
A first detection of the arrival of a low-frequency near electromagnetic field by starting oscillation at a second resonance frequency defined by the second LC resonance circuit based on a voltage induced in the second coil. A two-signal processing unit,
The inductance of the second coil is larger than the inductance of the first coil,
The first resonance frequency is equal to the second resonance frequency ;
The capacitance of the second capacitor is smaller than the capacitance of the first capacitor,
The low-frequency near electromagnetic field detection sensor , wherein the product of the inductance of the second coil and the capacitance of the second capacitor is equal to the product of the inductance of the first coil and the capacitance of the first capacitor . further,
A second shield that surrounds a part of the second coil and shields the electromagnetic field, corresponding to a first shield member that surrounds a part of the first coil and shields the electromagnetic field in the proximity switch. Including members,
The low-frequency vicinity according to claim 5 , wherein an opening of the second coil not surrounded by the second shield member is wider than an opening of the first coil not surrounded by the first shield member. Electromagnetic field detection sensor. Gaming machine comprising a low-frequency electromagnetic near field detecting sensor according to any one of claims 1 to 6, and a proximity switch for detecting the game balls. The notification device according to claim 7 , further comprising: a notification means for notifying the inside of the gaming machine or the outside of the gaming machine based on the output signal when the low-frequency near electromagnetic field detection sensor detects the arrival of near electromagnetic waves. Gaming machine. The gaming machine according to claim 7 or 8 , wherein the low-frequency near electromagnetic field detection sensor is disposed in the vicinity of a metal member or a structure plated with metal, which is disposed on a board surface of the gaming machine. The proximity switch that detects the game ball includes a first through hole that detects passage of the game ball,
The near electromagnetic field detection sensor includes a second through hole having substantially the same shape as the first through hole,
It said first through hole, and the second through opening is a game machine according to any one of claims 7 to 9 respective center lines are arranged coaxially.

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