JP2010273799A - Magnet detector and method for detecting magnet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnet detector allowing highly sensitive detection of a magnet used for illegal conducts against a game machine by preventing erroneous detection caused due to deviation of a detection origin by influence of excitation change and temperature rise caused due to power supply to electronic equipment. <P>SOLUTION: The magnet detector determines that the magnet is present near the magnet detector if output from a magnetic detection element is greater by a predetermined threshold value than a detection coordinate origin when no magnet is present near the magnet detector. An origin correction processing part discontinuously or continuously obtains output values from the magnetic detection element per predetermined period of time after the power supply to the magnet detector. When an amount of output change of the magnetic detection element in a predetermined period of time is smaller than the predetermined threshold value, the detection coordinate origin is corrected to a detection coordinate origin in the next predetermined period of time based on an average value of the output value from the magnetic detection element in the predetermined period of time. When the amount of output change of the magnetic detection element in the predetermined period of time is the predetermined threshold value or greater, it is determined that the magnet is detected. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a magnet detection device and a magnet detection method, and in particular, in a fraudulent magnet detection device attached to a pachinko machine, a fraud that detects a fraudulently acting magnet in front of the game machine without being affected by temperature change and excitation change. The present invention relates to a magnet detection apparatus and method.

  An illegal act may be performed in which a pachinko ball is unfairly awarded by operating a movement of a pachinko ball using a magnet to win a prize ball by winning an award. As a prior art for detecting magnets used for fraudulent acts, patent document 1 uses a magnet detector attached to the back of a gaming machine to detect and notify external magnets used for fraudulent acts to prevent fraudulent acts. Proposals have been made.

  Further, Patent Literature 2 is disclosed as a prior art for detecting an external magnet with high sensitivity by attaching a magnet detection means using a Hall element capable of detecting magnetism with higher sensitivity than a reed switch to the back surface of the gaming machine.

  However, the back surface of the gaming machine becomes a high temperature due to the effect of heat radiation from the electrical components, and may be erroneously detected by a magnet detection device using a Hall element that is easily affected by a temperature rise. In order to prevent this erroneous detection, in the above-mentioned Patent Document 2, the anti-tampering that accurately detects the magnetism of the external magnet without being affected by the temperature by correcting the output voltage corresponding to the temperature rise by using the temperature guarantee circuit. A device has been proposed.

Japanese Utility Model Publication No. 61-10786

JP 60-40078

  In Patent Document 2, the voltage applied from the Zener diode, which is a temperature guarantee circuit, to the Hall element and the output voltage output by detecting the magnetism of the Hall element vary depending on the characteristics of the Zener diode and the Hall element. Since the output voltage from the Hall element is amplified by an amplifier and an alarm is output, there is a problem that the difference between the amplified output voltage due to the Hall element increases due to variations in characteristics of the Hall element.

  In general, in order to increase the detection sensitivity, the detection sensitivity is increased by amplifying the output voltage from the detection element. For this reason, if the output voltage from the detection element varies, it becomes impossible to increase the amplification factor of the output voltage and increase the sensitivity.

  In addition, the main board, large liquid crystal, motor, etc. of the pachinko machine generate magnetism around the conductive wires in the pachinko machine when the power is turned on. In the conventional magnet detection device, when the magnet detection device is turned on, the magnetic output value of the magnetic detection element is set as the detection coordinate origin, so when the pachinko machine is turned on after the magnet detection device is turned on, There is also a problem that the detection coordinate origin shifts due to the influence and the magnetism of the external magnet cannot be detected correctly.

  In general, there is a method to correct the temperature drift characteristics by monitoring temperature changes using a temperature sensor, etc., but there is a need for additional costs for the temperature sensor and adjustment costs for correcting the characteristic variations of the temperature sensor itself. This leads to an increase in the cost of the magnetic detection device. Also, this method cannot correct the magnetic offset change of the main board, large liquid crystal, motor, etc. of the pachinko machine.

  In view of the above-mentioned problems, the object of the present invention is to use it for fraudulent gaming machines without being affected by temperature rise without adjusting variations in detection characteristics of magnetic detection elements such as Hall elements and temperature sensors. Another object of the present invention is to propose a magnet detection device that can detect an external magnet with high sensitivity.

  Another object of the present invention is to prevent misdetection due to deviations in the detection origin due to excitation changes caused by power-on of electronic equipment existing around the magnetic detection element and deviations in the detection origin due to the effect of temperature rise. Another object of the present invention is to propose a magnetic detection device that can detect an external magnet used for fraudulent acts with high sensitivity.

  In order to achieve the above object, the present invention provides a detection in which the output of the magnetic detection element included in the magnet detection device is the output of the magnetic detection element when there is no magnet in the vicinity of the magnet detection device. A magnet detection device that determines that a magnet is present in the vicinity of a magnet detection device when it is larger than a coordinate origin by a predetermined threshold or more, includes an origin correction processing unit, and the origin correction processing unit detects magnetism after turning on the magnet detection device. When the output value of the element is obtained discontinuously or continuously every predetermined time, and the output change amount of the magnetic detection element within the predetermined time is smaller than a predetermined threshold, the output value of the magnetic detection element within the predetermined time is The detected coordinate origin is corrected to the detected coordinate origin at the next predetermined time based on the average value, and it is determined that the magnet has been detected when the output change amount of the magnetic detection element within the predetermined time is equal to or greater than a predetermined threshold. A magnet detecting device and method of.

  According to one aspect of the present invention, the magnet detection device is for detecting a magnet used for an illegal act of a gaming machine.

  According to the present invention, since a temperature sensor is not used even in an environment where the ambient temperature rises, tuning by a combination of a temperature sensor and a magnetic flux detection element is unnecessary, and therefore, an increase in cost due to adjustment costs is unnecessary, and inexpensive and stable magnetic detection is possible. A possible magnet detection device can be provided.

  Further, even when there is an electronic device with a different input power source around the magnetic detection element, it is not necessary to check and correct the magnetic detection coordinate origin each time the electronic device is turned on. That is, it is not necessary to turn off and turn on the magnet detection device each time the power is supplied to the electronic device.

[BRIEF DESCRIPTION OF THE DRAWINGS] It is an external appearance perspective view of the pachinko game machine with which the magnet detection apparatus is mounted for demonstrating the background of this invention. It is a front view of the gaming machine shown in FIG. It is the external appearance perspective view seen from diagonally right forward of the other example of the pachinko gaming machine in which the magnet detection device is mounted for explaining the background of the present invention. It is the external appearance perspective view which looked at the gaming machine shown in FIG. 3 from diagonally right rear. It is a graph explaining the relationship between the position of a magnet and the output of a magnetic detection element in the technique before this invention. It is a graph explaining the change of the output of the magnetic detection element resulting from the power activation to the pachinko gaming machine in the technique before the present invention. It is a block diagram which shows the structure of the magnet detection apparatus by embodiment of this invention. It is a graph explaining a mode that the detection coordinate origin of a magnetic detection element changes with temperature drift by embodiment of this invention. It is a graph explaining the update of the detection coordinate origin of the magnetic detection element by embodiment of this invention. It is a flowchart explaining the main process of the magnet detection apparatus 81 shown in FIG. It is a flowchart explaining the detail of the origin determination process in step 103 of FIG. It is a flowchart explaining the detail of the magnet detection process in step 104 of FIG. 13 is a flowchart illustrating details of a magnetic flux density calculation process in step 121 of FIG. 12. It is a flowchart explaining the detail of the origin correction process of step 105 of FIG. It is an external appearance perspective view of the magnet detection apparatus 81 by embodiment of this invention. It is a perspective view which shows the inside of the magnet detection apparatus 81 shown in FIG.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. Throughout the drawings, the same reference numerals denote the same parts.

  FIG. 1 is an external perspective view of a pachinko gaming machine equipped with a magnet detection sensor for explaining the background of the present invention, and FIG. 2 is a front view of the gaming machine shown in FIG. 1 and 2, a pachinko gaming machine 3 includes a game frame 12, a game board 14 incorporated in the game frame 12, a game door 12 provided on the front surface of the game board 14, a glass door 16, and a game board. 14, a pachinko ball tray 20 provided on the front side of the game frame 12 below the glass door 16, and a pachinko ball launch handle 22 provided on the right side of the pachinko ball tray 20. And. A single magnet detection device 24 capable of detecting unauthorized magnets from the outside of the gaming machine 3 is attached to the end face of the frame of the glass door 16.

  FIG. 3 is an external perspective view of another example of a pachinko gaming machine equipped with a magnet detector for explaining the background of the present invention as seen from the right front side, and FIG. 4 is a perspective view of the gaming machine shown in FIG. It is the external appearance perspective view seen from the right diagonally back. In this example, a backpack 26 that is a case made of, for example, a transparent plastic that covers the main board is provided on the back surface of the pachinko gaming machine 10, and a magnet detection device 24 a is attached on the backpack 26. .

  In the magnet detection device 24 or 24a that determines that the magnet has been detected when the magnetic force from the magnet is detected and a magnetic force exceeding a preset threshold is detected, an attempt is made to detect a wide range of illegal magnets for the pachinko gaming machine 3 Then, it is necessary to increase the detection sensitivity of the magnet detection device 24 or 24a.

  If the detection threshold value of the output of the magnet detection device 24 or 24a is lowered in order to increase the detection sensitivity, the temperature change in the environment where the magnet detection device 24 or 24a is installed cannot be ignored. The influence due to the temperature change is caused by the temperature drift characteristic of the magnetic detection element mounted on the magnet detection device 24 or 24a. Due to this influence, even if the magnet is not brought close to the magnetic detection element, the magnetic output value of the element changes due to the temperature change. Examples of the magnetic detection element include a Hall element, a magnetoresistive element, and an MI element.

  The magnet detection device 24 or 24a detects the magnet when the difference between the magnetic output value of the magnetic detection element in a state where there is no magnetism and the magnetic output value in the state where the magnetism is present (a state where the magnet is brought closer) exceeds a threshold value. Since this is a device that determines and turns on the output, if the detection threshold is lowered to increase the detection sensitivity, the magnetic output value of the magnetic detection element changes due to changes in the ambient temperature despite the absence of magnetism. There is a problem that the magnet cannot be correctly detected and on-output cannot be performed.

  In particular, the magnet detection device in the present application is intended to be attached to a pachinko gaming machine, and changes in ambient temperature cannot be ignored due to the influence of the main base of the pachinko gaming machine, large liquid crystal, and the like.

  Also, the main board, large liquid crystal, motor, etc. of the pachinko machine generate magnetism when the power of the pachinko machine is turned on. The magnet detection device before the present invention sets the magnetic output value of the magnetic detection element as the detection coordinate origin when the magnet detection device is turned on, so when the pachinko gaming machine is turned on after the magnet detection device is turned on, There is also a problem that the detection coordinate origin shifts due to the influence of magnetism and the magnet cannot be detected correctly.

  In general, there is a method of correcting this temperature drift characteristic by monitoring temperature changes using a temperature sensor, etc., but this method is used to correct the cost due to the addition of the temperature sensor and the characteristic variation of the temperature sensor itself. Adjustment costs are required, leading to an increase in the cost of the magnetic detection device. Also, this method cannot correct the magnetic offset change of the main board, large liquid crystal, motor, etc. of the pachinko machine.

  Therefore, according to the embodiment of the present invention, a temperature drift due to temperature change and a main board of a pachinko machine, a large liquid crystal, and a power supply of a motor without adding a temperature sensor or the like to realize an inexpensive magnet detection device with high detection sensitivity. An apparatus and a method for correcting a magnetic offset change caused by charging are provided.

  FIG. 5 is a graph for explaining the relationship between the position of the magnet and the output of the magnetic detection element in the technique prior to the present invention. In FIG. 5, the upper graph shows the relationship between the output of the magnetic detection element and time, and the lower graph shows the relationship between the detection output state and time. In the state A, the magnet detection device 24 or 24a sets the output of the magnetic detection element when the power is turned on as the detection coordinate origin, and sets a threshold T for detecting the magnet. The threshold T is the amount of change in the output of the magnetic detection element from the detection coordinate origin when a magnet is present.

  In the state B, when the magnet is brought close to the magnet detection device 24 or 24a, the magnetic flux incident on the magnetic detection element increases, so that the output value of the timing detection element moves away from the detection coordinate origin. When the output value exceeds the threshold value T, the detection output state of the magnet detection device becomes “detection on” at time t1, and it is determined that the magnet exists in the vicinity of the magnet detection device.

  In state C, the magnetic flux incident on the magnetic detection element decreases as the magnet approaching the magnet detection device 24 or 24a is moved away, and when the output value of the magnetic detection element becomes smaller than the threshold T, the magnet detection device 24 or 24a The detection output state becomes “detection off” at time t2, and it is determined that the magnet does not exist in the vicinity of the magnet detection device.

   In state D, if the magnet is not in the vicinity of the magnet detection device, the output value of the magnetic detection element is the same as the detection coordinate origin.

  In the state E, when the ambient temperature of the magnet detection device 24 or 24a rises and becomes higher than the ambient temperature in the state A, the output value changes from the detection coordinate origin due to the temperature drift characteristic of the magnetic detection element, and the magnet is Although it is not close, it becomes “detection on” at time t3.

  FIG. 6 is a graph illustrating a change in the output of the magnetic detection element due to power-on to the pachinko gaming machine in the technology prior to the present invention.

  In FIG. 6, in the state A, the magnet detection device 24 or 24a sets the output of the magnetic detection element when the power is turned on as the detection coordinate origin, and sets a threshold T for detecting the magnet. The threshold T is the minimum value of the change amount of the output of the magnetic detection element from the detection coordinate origin.

  Thereafter, when the power of the pachinko gaming machine 10 is turned on in the state B, the output value of the magnetic detection element changes due to the magnetism generated by the electronic components such as the main board, liquid crystal, and motor. Even if there is no magnet due to this change in output, the output value changes from the detected coordinate origin and an offset occurs.

  If the threshold value T is decreased in order to increase the detection sensitivity, there is a problem that “detection on” occurs at a low detection output even though the magnet is not brought close due to the influence of temperature drift and offset change. To do.

  As described above, before the present invention, the output value of the magnetic detection element is output as binary values of “detection on” and “detection off” using only the threshold value for detecting the magnet.

  FIG. 7 is a block diagram showing the configuration of the magnet detection sensor according to the embodiment of the present invention. In FIG. 7, a magnet detection device 71 (corresponding to the magnet detection device 24 in FIGS. 1 and 2 or the magnet detection device 24a in FIGS. 3 and 4) outputs a magnetic detection element 72 and the output of the magnetic detection element 72. And a detection signal processing unit 73 for processing.

  The detection signal processing unit 73 is realized by a microcomputer in the present embodiment. The detection signal processing unit 73 includes a sensor signal acquisition processing unit 74 connected to the output of the magnetic detection element 72, an averaging filter unit 75 connected to the output of the sensor signal acquisition processing unit 74, and an origin determination processing unit 76. A magnet detection processing unit 77 connected to the outputs of the averaging filter unit 75 and the origin determination processing unit 76, and an origin correction determination processing unit 78 connected to the outputs of the sensor signal acquisition processing unit 74 and the magnet detection processing unit 77. It has.

  The sensor signal acquisition processing unit 74 acquires the output signal of the magnetic detection element 72. The averaging filter unit 75 performs averaging by the moving average method in order to remove the influence of the emission pulse included in the signal input to the detection signal processing unit 73. The origin determination processing unit 76 acquires the output of the magnetic detection element 72 when the magnet detection device 71 is turned on, and determines the detection coordinate origin. The magnet detection processing unit 77 calculates the difference between the output of the averaging filter unit 75 and the detection coordinate origin, and obtains the magnitude of the magnetic flux density according to the difference. When the magnitude of the magnetic flux density is equal to or greater than the threshold for detecting the magnet, ON is output, and when it is less than OFF, OFF is output. The origin correction determination processing unit 78 corrects the detected coordinate origin by the method described below.

  According to the embodiment of the present invention, a magnetic flux change threshold for correcting the detection coordinate origin is provided, and when the output value of the magnetic detection element is detected within the magnetic flux change threshold continuously for a predetermined time, Set the output value as the new detection coordinate origin and correct it.

  For the output value of the magnetic detection element used as the new detection coordinate origin, the average value of the output value within a predetermined time or the average value obtained by adding the maximum value and the minimum value of the output value within a predetermined time and dividing by 2 is used. is there.

  With this correction, even if the ambient temperature of the magnet detector changes, the output value due to the temperature drift of the magnetic sensing element can be used as the new detection coordinate origin, so that the flying of the magnet is detected regardless of the influence of the ambient temperature. be able to.

  Further, even if the power of the pachinko gaming machine is turned on after the magnet detection device 71 is turned on and the detection coordinate origin changes due to the influence of magnetism such as the main board, the liquid crystal, and the motor, the same correction can be made.

  In addition, this correction process eliminates the need to consider the effects of temperature and magnetic offset changes due to power-on of the pachinko machine, and the magnet detector can be installed in places where there are large temperature changes such as near the liquid crystal of the pachinko machine. There is also an advantage that there are fewer restrictions on the installation location.

  FIG. 8A is a graph for explaining how the detection coordinate origin of the magnetic detection element 72 changes due to temperature drift according to the embodiment of the present invention, and FIG. 8B is a conventional diagram in which the detection coordinate origin is not corrected. FIG. 8C is a graph showing the detection output state when the detection coordinate origin is corrected according to the embodiment of the present invention. In FIG. 8A, the vertical axis represents the magnitude of the magnetic flux density obtained at the output of the magnetic detection element 72, and the horizontal axis represents time.

  In the conventional technique in which the detection coordinate origin is not changed, as shown in FIG. 8B, the difference between the output of the magnetic detection element 72 and the detection coordinate origin org1 at time t0 when the magnet detection device 71 is turned on is an illegal magnet. The detection output is OFF from time t0 to t1 smaller than the detection threshold Δy, and after t4, and the difference between the output of the magnetic detection element 72 and the detection coordinate origin org1 at time t0 when the magnet detector 71 is turned on is the illegal magnet detection threshold. The detection output is on from t1 to t4 which is Δy or more.

  On the other hand, in the embodiment of the present invention, as shown in FIG. 8C, the detection coordinate origin of the magnetic detection element 72 is org1 at the time t0 when the power to the magnet detection device 71 is turned on. Since the detected coordinate origin changes according to the change of the temperature drift line during t, for example, the average value of the temperature drift line during the predetermined time t is set as the corrected detected coordinate origin org2 during this period. As a result, the difference between the output of the magnetic detection element 72 and the corrected detection coordinate origin org2 of the magnet detection device 71 is smaller than the illegal magnet detection threshold Δy from time t0 to t2, and after t3, the detection output is turned off. The detection output is turned on from t2 to t3 when the difference between the output 72 and the corrected detection coordinate origin org2 is equal to or greater than the illegal magnet detection threshold Δy.

  Thereby, even if the detection coordinate origin changes due to temperature drift, the illegal magnet can be detected accurately.

  FIG. 9 is a graph for explaining the update of the detection coordinate origin of the magnetic detection element 72 according to the embodiment of the present invention. Also in FIG. 9, the vertical axis represents the magnitude of the magnetic flux density obtained at the output of the magnetic detection element 72, and the horizontal axis represents time.

  The magnet detection device 71 sets the output value of the magnetic detection element 72 when the power is turned on as the detection coordinate origin org1. After org1 is set, if the output change amount of the magnetic detection element during the predetermined time t is less than the magnetic flux change threshold Δy, the output value at the predetermined time t is set as the new detection coordinate origin org2. After that, similarly, evaluate whether the output change amount of the magnetic detection element during the predetermined time t is less than the magnetic flux change threshold Δy, and if it matches the condition, set org3, org4 to org8 and the detection coordinate origin to correct Go.

  Further, when the amount of change in output for a predetermined time t is greater than or equal to the magnetic flux change threshold Δy due to the flying of the magnet and does not match the condition, the flying of the magnet can be detected without setting a new detection coordinate origin.

  The magnetic flux change threshold Δy and the predetermined time t can be determined from the temperature drift characteristics of the magnetic detection element 72 mounted on the magnet detection device 71 and the ambient temperature change of the mounting position with respect to the magnet detection device 71.

  For example, when the magnet detection device 71 is installed on the back surface of a pachinko gaming machine, the amount of change in the ambient temperature due to the influence of heat radiation from the backlight of the liquid crystal component is 20 ° C. to the maximum temperature 80 ° C. The magnitude of the output change of the magnetic detection element 72 at this time can be calculated from the temperature drift characteristic.

  In the present embodiment, the output change of the magnetic detection element 72 is 6 μT (micro Tesla). Here, if it is known how long it takes for the temperature to rise from 20 ° C. to 80 ° C., the maximum output change value (μT) per unit time (1 second) can be found.

  If the ambient temperature on the back side of the pachinko gaming machine rises from 20 ° C. before power-on to 80 ° C. after power-on in 15 minutes, the output of the magnetic detection element 72 changes by 6 μT in 15 minutes. The output change of the magnetic detection element is 6 μT ÷ 900 seconds = 0.007 μT per unit time (1 second). The predetermined time t is set to 3 minutes, for example, as a time during which it is difficult for the magnetic flux change accompanying the flying of the illegal magnet to trace the temperature drift line within a predetermined threshold. The magnetic flux change threshold value Δy may be set to the maximum output value during the set predetermined time t, so the magnetic flux change threshold value Δy = the maximum sensor output change amount per unit time (1 second) (μT) × predetermined. It can be obtained at time t, and is 0.007 μT × 180 seconds = 1.44 μT.

FIG. 10 is a flowchart for explaining the main processing of the magnet detection device 71 shown in FIG. In FIG. 10, the sensitivity of each axis is set by the sensor signal acquisition processing unit 74 in step 101. Since sensitivity is provided for each detection axis, the magnetic flux density of each axis is obtained by the following equation. In the following description, one dimension of the X axis will be described for the sake of simplicity, but in actuality, processing can be performed in any one dimension, two dimensions, and three dimensions.
Magnetic flux density (μT) ΔX = (X−X0) ÷ X-axis sensitivity (mV / μT)
Here, X0 is the output of the magnetic detection element 72 when the power is turned on,
X is the output of the magnetic detection element 72,
ΔX is a magnetic flux density change amount.
Since the same applies to the Y and Z axes, the description thereof is omitted.

  Next, at step 102, the origin determination processing unit 76 sets the magnet detection threshold S1, the predetermined time t, and the magnetic flux change threshold Δy.

  Next, in step 103, origin determination processing is performed. The details of this processing are shown in the flowchart shown in FIG. Step 103 is an infinite loop, and is continued until the power is turned off and the main process is completed.

  Following step 103, magnet detection processing is performed in step 104. The details of this processing are shown in the flowchart of FIG. Briefly, (1) when the magnet approaches the magnet detection device 71, the output of the magnetic detection element 72 changes due to the magnetic field of the magnet. (2) The amount of change in the output of the magnetic detection element 72 from the sensor output reference value is obtained as the magnitude of the magnetic flux density. (3) When the magnet is moved closer and the change amount obtained in (2) exceeds the threshold value S1 for detecting the magnet, the detection output is turned on. Further, when the close magnet is moved away and the amount of change falls below the threshold value S1 for detecting the magnet, the detection output is turned off. In this case, the detection coordinate origin that is the output of the magnetic detection element 72 when the magnet is not in the vicinity is the one corrected by the above-described method.

  Following step 104, the origin correction process is performed in step 105. Here, as described with reference to FIGS. 8 and 9, when the output change amount of the magnetic detection element 72 within the predetermined time t is smaller than the predetermined threshold value Δy, the average of the output values of the magnetic detection elements within the predetermined time Based on the value, the detected coordinate origin is corrected to be the detected coordinate origin at the next predetermined time, and when the output change amount of the magnetic detection element 72 within the predetermined time t is equal to or greater than the predetermined threshold Δy, it is determined that the magnet has been detected. .

  Step 105 is also an infinite loop, and is continued until the power is turned off and the main process is completed.

  FIG. 11 is a flowchart for explaining the details of step 103 in FIG. In FIG. 11, in step 111, the number of sampling points is N (N is a natural number). In step 112, the data acquisition number Cnt is reset to zero. In step 113, the X-axis value Xad of the detection output of the magnet detector 71 is AD converted. In step 114, the AD conversion result is added to the previous AD conversion result and stored. Further, the data acquisition number Cnt is incremented. Steps 113 to 115 are repeated until the data acquisition number Cnt reaches a predetermined number N in step 115. When the data acquisition number Cnt becomes equal to or greater than the predetermined number N in step 115, the sum of the AD conversion results is divided by N in step 116 to obtain the origin. That is, the X-axis origin X0 is X0 = Xsum / N. The Y axis and Z axis are the same as the origin determination process for the X axis.

  FIG. 12 is a flowchart for explaining the details of the magnet detection process in step 104 of FIG. In FIG. 12, in step 121, the sensor signal acquisition processing unit 74 calculates the magnitude (ΔX) of the magnetic flux density from the output of the magnetic detection element 72. Next, at step 122, the averaging filter unit 75 performs an averaging process. In this process, the sampling interval Δt (seconds) and the averaging time Tave when N points moving average is Tave = NΔt (seconds), so that the signal X (t) is averaged between Tave (seconds). The output can be expressed as:

  Next, at step 123, it is determined whether or not ΔXave> detection threshold S1 is established. If it is established, the routine proceeds to step 12 where the detection output is turned on, and if not, the detection output is turned off at step 125.

  FIG. 13 is a flowchart for explaining the details of the magnetic flux density calculation process in step 121 of FIG. In FIG. 13, in step 131, the output of the magnetic detection element 72 is AD converted to obtain a digital value Xad. Next, at step 132, the amount of change from the origin of the digital value is calculated. That is, ΔX = (Xad−X0) ÷ Xk (X-axis sensitivity) is calculated. The Y axis and the Z axis are the same as the calculation processing of the magnetic flux density with respect to the X axis.

  FIG. 14 is a flowchart for explaining the details of the origin correction processing in step 105 of FIG. The origin correction process is performed by the origin correction processing unit 78. In FIG. 14, it is determined in step 141 whether the detection output of the magnet detection device 71 is on. If it is ON, the process proceeds to step 142 and it is determined whether the process is step 0. Since the processing step is set to 0 in the initial state, the process proceeds to step 143. In step 143, the maximum change amount Δy_max of the output voltage of the magnetic detection element 72 is initialized to 0, the calculation reference value X_start is initialized to Xad, and the acquisition time Cnt2 for acquiring the corrected detection coordinate origin is set to t. The total value Xsum2 is initialized to Xad. In step 144, the processing step is updated to 1 (STEP = 1).

  If the determination in step 142 is no, the process proceeds to step 146 to determine whether the processing step is 1 (STEP = 1). If not, the process proceeds to step 1407, where the detected coordinate origin X0 is set and updated. That is, X0 = XSum2 / Cnt2. Next, the routine proceeds to step 1408, where the step is updated to STEP = 0.

  If STEP = 1 in step 146, the process proceeds to step 147, and the current change amount (ΔXnow = | X_start−Xad |) of the output voltage of the magnetic detection element 72 is calculated. Next, the routine proceeds to step 148, where the amount of change is converted into the magnitude of the magnetic flux according to the equation ΔXnow = ΔXnow ÷ Xk (X-axis sensitivity).

  Next, at step 149, it is determined whether the current change amount ΔXnow of the output magnetic flux of the magnetic detection element 72 is larger than the maximum change amount Δy_max. If it is larger, the maximum change amount is updated to the current change amount in step 1401. If the determination in step 149 is no, or after step 1401, the process proceeds to step 1402, where it is determined whether the maximum change amount Δy_max is smaller than the magnetic flux change threshold value Δy. If it is smaller, the process proceeds to step 1403, and the acquisition time CNT2 is decremented and the total value is updated by the total value XSUM2 + = XAD.

  If the determination in step 141 is yes, the process proceeds to step 1409 and the processing step is updated to 0 (STEP = 0).

  If the determination in step 146 is no, it is determined that a predetermined time t has passed and step STEP = 2 has been reached, and the detected coordinate origin is updated by, for example, X0 = Xsum2 / Cnt2 in step 1407. Update to

  After Steps 1405, 1406, 1408, and 1409, the process returns to Step 141, and the same operation as described above is repeated until the power of the magnet detector 71 is turned off.

  FIG. 15 is an external perspective view of the magnet detector 71 according to the embodiment of the present invention. In FIG. 15, the magnet detection device 71 includes a VCC power supply pin 151 and a ground (GDN) pin 152. A 3-pin connector 154 including a detection output pin 153 is provided.

  FIG. 16 is a perspective view showing the inside of the magnet detector 71 shown in FIG. In FIG. 16, the magnet detection device 71 includes a magnetic detection element 72, a detection signal processing unit 73, and a 3-pin connector 154. The detection signal processing unit 73 is realized by a microcomputer.

  The present invention is not limited to the above embodiment, and various modifications can be made. For example, the detection signal processing unit 73 may be realized by an electronic device having another signal processing function instead of the microcomputer.

  According to the present invention, it is possible to accurately detect illegal magnets in a pachinko machine even in an environment where the ambient temperature rises and even when there are electronic devices with different input power sources around the magnetic detection element. become.

DESCRIPTION OF SYMBOLS 10 Pachinko machine 24 Magnet detection apparatus 71 Magnet detection apparatus 72 Magnetic detection element 73 Detection signal processing part 74 Sensor signal acquisition process part 75 Average filter part 76 Origin determination process part 77 Magnet detection process part 78 Origin correction process part

Claims (4)

When the output of the magnetic detection element included in the magnet detection device is larger than a detection coordinate origin that is an output of the magnetic detection element when no magnet is present in the vicinity of the magnet detection device, the magnet is detected by the magnet detection device. In the magnet detection device that determines that it exists in the vicinity of
An origin correction processing unit is provided, and the origin correction processing unit obtains an output value of the magnetic detection element after power-on of the magnet detection device discontinuously or continuously every predetermined time, and within the predetermined time When the output change amount of the magnetic detection element is smaller than the predetermined threshold value, the detection coordinate origin is corrected based on the average value of the output values of the magnetic detection element within the predetermined time to detect the detection coordinates at the next predetermined time A magnet detection device characterized by determining that a magnet has been detected when an output change amount of the magnetic detection element within the predetermined time is equal to or greater than the predetermined threshold value.   The magnet detection device according to claim 1, wherein the magnet detection device is for detecting a magnet used for an illegal act of a gaming machine. When the output of the magnetic detection element included in the magnet detection device is larger than a detection coordinate origin that is an output of the magnetic detection element when no magnet is present in the vicinity of the magnet detection device, the magnet is detected by the magnet detection device. In the magnet detection method for determining that it exists in the vicinity of
The output value of the magnetic detection element after power-on of the magnet detection device is obtained discontinuously or continuously every predetermined time, and the output change amount of the magnetic detection element within the predetermined time is smaller than the predetermined threshold value In the case, the detection coordinate origin is corrected based on an average value of the output values of the magnetic detection element within the predetermined time to be a detection coordinate origin at the next predetermined time, and the output of the magnetic detection element within the predetermined time A magnet detection method characterized by determining that a magnet has been detected when the amount of change is equal to or greater than the predetermined threshold.   The magnet detection method according to claim 3, wherein the magnet detection device is for detecting a magnet used for an illegal act of a gaming machine.

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