JP5670073B2 - Magnetic field detection apparatus and ball game apparatus using the same - Google Patents

Description

  The present invention relates to a magnetic field detection device that detects a magnetic vector with magnetic sensors directed in three orthogonal directions, and more particularly to a magnetic field detection device having different detection sensitivities in accordance with directions and a ball game apparatus using the same.

  A magnetic field detection device using a three-axis magnetic sensor that detects magnetic field strengths in three directions orthogonal to each other is used in various applications.

  In Patent Document 1 below, a magnetic sensor including an X-axis sensor, a Y-axis sensor, and a Z-axis sensor that detect a magnetic field is mounted on a ball game apparatus. The ball game apparatus is equipped with four or more magnetic sensors that detect magnetism in three axial directions, and each magnetic sensor can detect a magnetic field from a magnet.

  By detecting a magnetic field with each of the four magnetic sensors, an illegal player's action using a magnet is detected.

JP 2009-279247 A

  The magnetic sensor described in Patent Document 1 has uniform sensitivity in the X-axis direction, the Y-axis direction, and the Z-axis direction, and has a narrow sensing area. Therefore, unless four or more magnetic sensors are mounted, the presence of a magnet cannot be detected in a wide range of the ball game apparatus. Also, an area that cannot be covered by the sensitivity of each magnetic sensor is likely to occur.

  The present invention solves the above-described conventional problems, can detect a magnetic field in three axial directions, sets a three-dimensional coordinate by a control unit, and changes sensitivity according to the direction on the three-dimensional coordinate. Accordingly, an object of the present invention is to provide a magnetic field detection device that can detect a magnetic field vector having a required magnitude in a required region.

  Another object of the present invention is to provide a ball game apparatus that can effectively detect the approach of an illegal magnet by covering the wide area using the magnetic field detection apparatus.

The magnetic field detection device of the present invention includes a magnetic detection unit in which an X axis, a Y axis, and a Z axis orthogonal to each other are determined, and a control unit,
The magnetic detection unit is provided with an X-axis sensor that detects a magnetic field in the X-axis direction, a Y-axis sensor that detects a magnetic field in the Y-axis direction, and a Z-axis sensor that detects a magnetic field in the Z-axis direction,
Three-dimensional coordinates are set by the control unit, the direction of the magnetic vector calculated from the detection output of each sensor is specified on the three-dimensional coordinates,
The sensitivity of at least one of the X-axis sensor, the Y-axis sensor, and the Z-axis sensor is different from the sensitivity of the other sensors, and the detection area for detecting the magnetic vector has a three-dimensional coordinate. It is characterized in that it is set so as to differ depending on the direction from the origin.

In the magnetic field detection apparatus of the present invention, in the control unit, the extent of the detection region for detecting the magnetic vector is made different depending on the direction. Therefore, it is possible to detect the magnetic field conforming to APPLICATIONS. When a plurality of magnetic field detection devices are used, each magnetic field detection device can cover a wide range.

The present invention, in the control unit, and the sensitivity coefficient of the particular orientation of the three-dimensional coordinates that is different from the other direction, is different from the spread of the detection region from the origin.

For example, at least one of the sensitivity coefficient of the X-axis and Y-axis and Z-axis of the three-dimensional coordinates by different other, the spread of the detection region from the origin can be made different according to the direction.

That is, according to the present invention, the sensitivity of the X axis is L, the sensitivity of the Y axis is M, the sensitivity of the Z axis is N, the detection output of the X axis is x, the detection output of the Y axis is y, and the detection output of the Z axis is z. , {(L · x ) ² + (M · y) ² + (N · z) ² } can be configured to acquire a detection output having a predetermined value or more.
In this case, the sensitivities L, M, and N can be freely changed.

Further, according to the present invention, the X-axis, Y-axis, and Z-axis components of the disturbance magnetic field are set to “x0”, “y0”, and “z0”, respectively, and √ [{L · (x−x0)} ² + {M · (y It is preferable to acquire a detection output in which −y0)} ² + {N · (z−z0)} ² ] is equal to or greater than a predetermined value.

The present invention also eliminates one of the directions of sensitivity of the X-axis and Y-axis and Z-axis of the three-dimensional coordinates, it is possible to differ the spread of the detection region from the origin according to the direction.

The ball game apparatus of the present invention is equipped with the magnetic field detection device and detects an approach of an illegal magnetic field from the outside, and the detection area is wide except for the illegal magnetic field provided in the ball game apparatus . In consideration of a member that generates magnetism, it is reduced in an arbitrary direction .

  The ball game apparatus of the present invention may be configured such that a host computer that communicates with the control unit is provided, and information regarding sensitivity is transmitted from the control unit to the host computer.

  In addition, the host computer instructs the control unit to notify the host computer of information about the sensitivity held by the control unit when the power is turned on, and the information notified from the control unit It is determined whether or not the information matches the information stored in advance in the computer. When the information matches, the control unit is instructed to start the operation. When the information does not match, the control unit is in an abnormal state. It is possible to judge.

Magnetic field sensing apparatus of the present invention, it is possible to change the spread of the detection area according to the direction, it is possible to set the detection area in accordance with the use for application.

The ball game apparatus of the present invention is equipped with a magnetic field detection device, so that the detection area can be widened in a direction that requires monitoring, and the approach of illegal magnets can be detected effectively. In addition, with a small number of magnetic field detection devices, it is possible to cover a wide area that needs to be monitored, and it is possible to narrow the detection area for an area that may be erroneously detected.

The circuit block diagram of the magnetic field detection apparatus of embodiment of this invention, Explanatory drawing of the X-axis sensor, the Y-axis sensor, and the Z-axis sensor provided in the magnetic detection unit, 3D explanatory diagram showing the principle of magnetic vector detection operation, Explanatory diagram showing an example of sensitivity settings, Explanatory diagram showing an example of sensitivity settings, (A) is a plan view of a ball game apparatus equipped with a magnetic field detection device, (B) is a front view, (A) is a plan view of a ball game apparatus equipped with a magnetic field detection device, (B) is a front view, A circuit block diagram showing a connection line between a main controller and a host computer mounted on the ball game apparatus, A waveform diagram showing communication signals between the main control unit and the host computer,

  A magnetic field detection device 1 according to an embodiment of the present invention shown in FIG. As shown in FIG. 2, in the magnetic detection unit 2, the X axis, the Y axis, and the Z axis, which are reference axes orthogonal to each other, are determined as fixed axes.

  As shown in FIG. 2, the X-axis sensor 3 is fixed along the X-axis, the Y-axis sensor 4 is fixed along the Y-axis, and the Z-axis sensor is fixed along the Z-axis. Has been. The X-axis sensor 3, the Y-axis sensor 4, and the Z-axis sensor 5 are all composed of GMR elements. The GMR element is composed of a pinned magnetic layer and a free magnetic layer made of a soft magnetic material such as a Ni—Co alloy or a Ni—Fe alloy, and a nonmagnetic material such as copper sandwiched between the pinned magnetic layer and the free magnetic layer. And a conductive layer. An antiferromagnetic layer is laminated under the pinned magnetic layer, and the magnetization of the pinned magnetic layer is pinned by antiferromagnetic coupling between the antiferromagnetic layer and the pinned magnetic layer.

  The X-axis sensor 3 detects a component of the magnetism in the X direction, and the magnetization direction of the pinned magnetic layer is fixed in the PX direction along the X axis. The direction of magnetization of the free magnetic layer responds to the direction of magnetism. When the magnetization direction of the free magnetic layer is parallel to the PX direction, the resistance value of the X-axis sensor 3 is minimized, and when the magnetization direction of the free magnetic layer is opposite to the PX direction, the resistance value of the X-axis sensor 3 is maximized. become. Further, when the magnetization direction of the free magnetic layer is orthogonal to the PX direction, the resistance value is an average value of the maximum value and the minimum value.

  In the magnetic field data detection unit 6 shown in FIG. 1, the X-axis sensor 3 and the fixed resistance are connected in series, and a voltage is applied to the series circuit of the X-axis sensor 3 and the fixed resistance. The potential between the resistor and the resistor is taken out as an X axis detection output. When a magnetic field directed in the X direction is not applied to the X-axis sensor 3, or when a magnetic field orthogonal to PX is applied, the X-axis detection output becomes a midpoint potential.

  When the magnetic vector V of the magnetic field applied from the outside is directed in the pinned direction PX of the magnetization of the pinned magnetic layer of the X-axis sensor 3, the X-axis detection output becomes a maximum value on the plus side with respect to the midpoint potential. Become. On the other hand, when the magnetic vector V is directed opposite to the magnetization fixed direction PX of the fixed magnetic layer of the X-axis sensor 3, the reverse magnetic field component applied to the X-axis sensor 3 has a maximum value. At this time, the detected output of the X axis has a maximum value on the minus side with respect to the midpoint potential.

  In the magnetic field data detection unit 6, each of the Y-axis sensor 4 and the Z-axis sensor 5 is also connected in series with a fixed resistor, and a voltage is applied to the Y-axis sensor 4 or the series circuit of the Z-axis sensor 5 and the fixed resistor. Thus, the potential between each sensor and the fixed resistor is taken out as a Y-axis or Z-axis detection output.

  When the magnetic vector V is directed in the pinned direction PY of the magnetization of the pinned magnetic layer of the Y-axis sensor 4, the Y-axis detection output becomes a maximum value on the plus side with respect to the midpoint potential. When the magnetic vector V is directed in the direction opposite to the fixed direction PY of the magnetization of the fixed magnetic layer of the Y-axis sensor 4, the Y-axis detection output has a maximum value on the minus side with respect to the midpoint potential. Similarly, when the magnetic vector V is directed in the same direction as the magnetization fixed direction PZ of the pinned magnetic layer of the Z-axis sensor 5, the Z-axis detection output becomes a maximum value on the plus side with respect to the midpoint potential. When the magnetic vector V becomes opposite to the magnetization fixed direction PZ of the magnetization of the fixed magnetic layer of the Z-axis sensor 5, the Z-axis detection output becomes a maximum value on the minus side with respect to the midpoint potential.

  If the magnitude of the magnetic vector V is constant, the detection outputs from the X-axis sensor 3, the Y-axis sensor 4, and the Z-axis sensor 5 are the absolute value of the positive maximum value and the negative maximum value. The absolute value is the same.

  As the X-axis sensor 3, a positive detection output and a negative detection output are obtained depending on the direction of the magnetic vector, and the absolute value is the same between the maximum value of the positive detection output and the maximum value of the negative detection output. If it becomes, it can also be comprised with magnetic sensors other than a GMR element. For example, a Hall element or MR element that can detect only the positive magnetic field intensity along the X axis and a Hall element or MR element that can detect only the negative magnetic field intensity may be combined and used as the X axis sensor 3. Good. The same applies to the Y-axis sensor 4 and the Z-axis sensor 5.

  As shown in FIG. 1, the detection output of the X axis, the Y axis, and the Z axis detected by the magnetic field data detection unit 6 is given to the control unit 10. The control unit 10 includes an A / D conversion unit, a CPU, a clock circuit, and the like. According to the measurement time of the clock circuit of the control unit 10, the detection outputs of the X axis, the Y axis, and the Z axis detected by the magnetic field data detection unit 6 are intermittently sampled in a short cycle and read out to the control unit 10. . Each detection output is converted into a digital value by the A / D conversion unit provided in the control unit 10.

  A memory 7 is connected to the CPU constituting the control unit 10. In the memory 7, software for arithmetic processing is programmed and stored. The arithmetic processing of the control unit 10 is executed by the software.

  A sensitivity coefficient is set in the control unit 10, and the X-axis detection output, the Y-axis detection output, and the Z-axis detection output that are read from the magnetic field data detection unit 6 at regular intervals are multiplied by the sensitivity coefficient ( Multiplied). When the sensitivity coefficient of the detection output of the X axis is “L”, the sensitivity coefficient of the detection output of the Y axis is “M”, and the sensitivity coefficient of the detection output of the Z axis is “N”, the control unit 10 uses the magnetic field data. The X-axis detection output read from the detection unit 6 is multiplied by the sensitivity coefficient “L”, and only data whose result is a certain value “R” or more is acquired. Similarly, the Y axis detection output read from the magnetic field data detection unit 6 is multiplied by the sensitivity coefficient “M”, and only the data whose result is equal to or greater than a certain value “R” is acquired, and the Z axis detection output is obtained. Is multiplied by the sensitivity coefficient “N”, and only data whose result is equal to or greater than a certain value “R” is acquired.

That is, assuming that the detection output of the X axis acquired by the control unit 10 at a certain time is “x”, the detection output of the Y axis is “y”, and the detection output of the Z axis is “z”, the control unit 10 Taking into account the sensitivity coefficient, Va = √ [(L · x) ² + (M · y) ² + (N · z) ² ] is calculated (Va is the absolute value of the magnetic vector V), and Va is constant. Only data that is greater than or equal to the value “R” is acquired.

In the example shown in FIG. 3, the sensitivity coefficient “L” of the detection output of the X axis, the sensitivity coefficient “M” of the detection output of the Y axis, and the sensitivity coefficient “N” of the detection output of the Z axis all have the same value “ A ”is set. Therefore, only data in which Va = √ [(A · x) ² + (A · y) ² + (A · z) ² ] is equal to or greater than “R” is acquired.

  It is assumed that the characteristics of the X-axis sensor 3, the Y-axis sensor 4, and the Z-axis sensor 5 are all uniform, and the characteristics such as resistance connected to the sensors 3, 4, and 5 in the magnetic field data detection unit 6 are also uniform. In this case, when the sensitivity coefficient in each direction of the X axis, the Y axis, and the Z axis is set to the same “A” and data of a certain value “R” or more is acquired, as shown in FIG. A spherical three-dimensional detection region G having a radius R is set. In FIG. 3, if the magnetic vector V has an absolute value greater than “R”, it is determined that the control unit 10 has detected magnetism of a predetermined strength regardless of the direction in which the magnetic vector V is directed.

  In the embodiment of the present invention, the sensitivity coefficients of the X, Y, and Z axes are different from each other. This sensitivity coefficient can be freely changed and set in the control unit 20 by an external operation.

  In the setting example shown in FIG. 4, both the positive and negative sensitivity coefficients of the X axis are “A” and the positive and negative sensitivity coefficients of the Z axis are both “A”, as shown in FIG. Further, as shown in FIG. 4A, both positive and negative sensitivity coefficients of Y are “B”. The sensitivity coefficient “B” is set to a value smaller than “A”.

The control unit 10 multiplies the X-axis positive / negative detection output obtained from the magnetic field data detection unit 6 by the sensitivity coefficient “A”, multiplies the Y-axis positive / negative detection output by the sensitivity coefficient “B”, and the Z-axis. Is multiplied by the sensitivity coefficient “A”, and as a result, data having an absolute value equal to or greater than “R” is acquired. That is, Va = √ [(A · x) ² + (B · y) ² + (A · z) ² ] is calculated, and data whose value is “R” or more is acquired.

  As a result, as shown in FIG. 4, a three-dimensional detection area Ga in which the positive and negative directions of the Y axis are crushed is set in the three-dimensional coordinates. The detection sensitivity with respect to the external magnetic field acting from the positive and negative directions of the X axis and the positive and negative directions of the Z axis is the same as in FIG. 3, but the sensitivity is lowered with respect to the external magnetic field acting from the positive and negative directions of the Y axis.

  In the sensitivity coefficient setting examples shown in FIGS. 5A and 5B, the positive and negative sensitivity coefficients on the X axis are “A”, and the positive and negative sensitivity coefficients on the Z axis are “B”. With respect to the Y axis, the sensitivity coefficient on the plus side is “C”, and the sensitivity coefficient on the minus side is “D”. The sensitivity coefficient “B” is smaller than the sensitivity coefficient “A”. The sensitivity coefficient “C” is smaller than the sensitivity coefficient “B”, and the sensitivity coefficient “D” is smaller than the sensitivity coefficient “C”.

  The control unit 10 multiplies the X axis positive / negative detection output acquired from the magnetic field data detection unit 6 by the sensitivity coefficient “A”. The Z axis positive / negative detection output is multiplied by the sensitivity coefficient “B”. For the Y axis detection output, the sensitivity coefficient “C” is multiplied by the plus output, and the sensitivity coefficient “D” is multiplied by the minus output. In the control unit 10, only data having a predetermined value “R” or more as a result of multiplying the detection output of the X axis, the Y axis, and the Z axis by the sensitivity coefficient is acquired.

In this case, Va = √ [(A · x) ² + (C · y) ² or (D · y) ² + (B · z) ² ] is calculated, and data whose value is “R” or more is calculated. To be acquired.

  The detection region Gb at this time is a three-dimensional shape in which the Z direction is crushed up and down as shown in FIG. 5 (B), and the negative side of the Y axis is crushed larger than the plus side as shown in FIG. 5 (A). This detection area Gb is set. In this detection region Gb, the detection sensitivity of the component directed to the Z axis is lower than the detection sensitivity of the component directed to the X axis of the external magnetic field. Regarding the Y-axis direction, the sensitivity to the component given from the minus side is lower than the sensitivity to the component given from the plus side of the external magnetic field.

Actually, in an environment where the magnetic field detection device 1 is used, there is a magnetic field that causes a disturbance other than the magnetic vector V to be measured. The disturbance magnetic field is a surrounding electronic device, a metal object, or geomagnetism. Therefore, a disturbance magnetic field in an environment where the magnetic field detection device 1 is used is detected in advance using the magnetic field detection device 1 itself, and the magnitudes of the disturbance magnetic field “x0”, “y0”, and “z0” are controlled by the control unit. 10 is stored. In the case of setting the sensitivity coefficient shown in FIG. 4, Va = √ {{A · (x−x0)} ² + {B · (y−y0)} ² + {A · (z− z0)} ² ] is calculated, and data whose value is “R” or more is acquired.

  As a result, the disturbance magnetic field is canceled, and the magnetic vector V that is the detection target can be accurately detected.

  FIG. 6 shows an outline of the ball game apparatus 20. The ball game device 20 is a game in which an iron ball is launched and inserted into a plurality of winning holes. A display board 21 is provided in the front part of the ball game apparatus 20, and an iron ball is launched into the display board 21 when a handle 22 provided on the lower side of the front part is operated. In the ball game apparatus 20, a speaker 23 is disposed above as a member that generates magnetism, and a solenoid 24 is disposed near the handle 22.

In the ball game apparatus 20, the magnetic field detection device 1 is disposed at a substantially central portion on the back side of the display board 21. The magnetic field detection device 1 has a sensitivity coefficient set in the pattern shown in FIG. 5 and has a detection region Gb. The sensitivity of the detection region Gb of the magnetic field detection device 1 decreases in the vertical direction (Z direction) in which the speaker 23 and the solenoid 24 are disposed, but the sensitivity in the horizontal direction (X direction) is high. Since various electronic circuits and magnetic parts that generate magnetism are arranged in the negative direction of the Y-axis, the sensitivity in that direction is extremely low. On the other hand, as shown in FIG. 6 (A), the sensitivity region Gb on the positive side of the Y-axis extends over a wide range along the front surface of the display panel 21. With the magnetic field detection device 1 installed, The magnitudes “x0”, “y0”, and “z0” of the disturbance magnetic field are measured and stored in advance, and the offset components “x0” and “y0” are detected from the detection outputs “x”, “y”, and “z” as described above. "Z0" is divided to perform the operation.

  As a result, when an illegal magnet approaches the display board 21, it is easy to detect an illegal magnetic field from the magnet by the detection region Gb that extends widely to the front side of the display board 21. Moreover, since the detection area Gb does not swell greatly on the positive side of the Y-axis, it is sensitive to magnetism emitted from a player's property located away from the display board 21, such as a mobile phone or a magnetic necklace. It becomes dull and the probability of misdetecting these becomes low.

  In addition, since the detection sensitivity of the ball game apparatus 20 toward the portion where the speaker 23 and the solenoid 24 are arranged is lowered, the magnetic field generated from the speaker 23 and the solenoid 24 is a magnetic field from an illegal magnet. It is easy to prevent mistaken recognition. Since the detection sensitivity in the negative direction of the Y axis is also reduced, the possibility of erroneous detection of a magnetic field from an electronic circuit or a mechanism that generates magnetism provided on the back of the display board 21 is also reduced.

  In the embodiment shown in FIG. 7, two magnetic field generators 1 </ b> A and 1 </ b> B are attached to the ball game apparatus 20. The magnetic field generator 1 </ b> A is attached to the back side and the upper part of the display panel 21, and the magnetic field generator 1 </ b> B is attached to the back side and the lower part of the display board 21.

  As shown in FIG. 7B, in the magnetic field generator 1A, the positive and negative sensitivity coefficients of the X axis are “A”. The sensitivity coefficient on the negative side of the Z axis is “A”, but the sensitivity coefficient on the positive side of the Z axis is “0”. In the magnetic field generator 1B, the positive and negative sensitivity coefficients in the X direction are “A”. The sensitivity coefficient on the positive side of the Z axis is “A”, but the sensitivity coefficient on the negative side of the Z axis is “0”. As shown in FIG. 7A, in both the magnetic field generators 1A and 1B, the sensitivity coefficient on the plus side of the Y axis is “C”, but the sensitivity coefficient on the minus side of the Y axis is “0”. In this way, it is possible to set so that the sensitivity in either direction is completely eliminated.

  As shown in FIG. 7B, the ball game apparatus 20 can completely remove the speaker 23 and the solenoid 24 from the detection areas Gc of the two magnetic field detection apparatuses 1A and 1B. Further, as shown in FIG. 7A, the back side of the display panel 21 can be completely removed from the detection areas Gc of the two magnetic field detection devices 1A and 1B.

  As shown in FIG. 7A, since a wide area and a shallow detection area Gc is formed in front of the display board 21 (+ Y side), when an illegal magnet approaches the display board 21 It becomes easy to detect. As shown in FIG. 7B, the detection areas Gc of the two magnetic field detection devices 1A and 1B overlap each other in front of the display panel 21, and are monitored by the two magnetic field detection devices 1A and 1B. . Therefore, the probability of finding illegal magnet approach can be increased.

  As shown in FIG. 8, the ball game apparatus 20 includes various electronic control mechanisms, a display, and the like, and is provided with a main control unit 100 that performs overall control thereof. The control unit 10 of the magnetic field detection apparatus 1 shown in FIG. 1 is included in the main control unit 100, and is controlled by other software that is executed by the main control unit 100 together with other electronic control mechanisms and displays. , X axis, Y axis and Z axis detection outputs are processed, and the sensitivity coefficient is set.

  The main control unit 100 and the host computer 30 mounted on each of the ball game apparatuses 20 arranged in the store are connected by an interface. By transferring serial data using one connection line 31 of the interface, the host computer 30 and the main controller 100 can communicate detection information of the magnetic field detection device 1. By using only one connection line 31 of the interface, it is possible to communicate magnetic field detection information without burdening other controls.

  When an illegal magnet approaches the ball game apparatus 20 and its magnetic field is detected by the detection areas of the magnetic field detection devices 1, 1 </ b> A, 1 </ b> B, the host computer 30 via the connection line 31 from the main control unit 100 that also serves as the control unit 10. Will be alerted. When the host computer 30 receives a warning, a command to stop using the ball game apparatus 20 is given to the main control unit 100.

  An example of communication between the host computer 30 and the main control unit 100 of each of the magnetic field detection devices 1, 1A, 1B is shown in FIG.

  In FIG. 9A, when the host computer 30 is turned on in the morning or the like, the host computer 30 requests the main control unit 100 to transfer data related to the sensitivity coefficient information of the magnetic field detector 1. Request pulse signal 35 is provided. In response to this, in FIG. 9B, the main control unit 100 gives a pulse signal 36 including data of sensitivity coefficient information to the host computer 30. The pulse signal 36 includes ID information and sensitivity coefficient information assigned to each ball game apparatus 20. This information is a signal obtained by encrypting the sensitivity coefficients A, B, C, D,... Shown in FIGS.

  In the host computer 30, the ID information transferred from the main control unit 100 is decoded, and the ball game apparatus 20 that has sent the data is specified. Further, data including sensitivity coefficient information is decoded, and it is confirmed whether or not these data match the regular data held in the host computer 30. If they match, a confirmation signal pulse 37 shown in FIG. 9C is given to each main control unit 100, and the ball game apparatus 20 is operated normally. When the sensitivity coefficient information does not match, a command such as stopping the operation of the main control unit 100 is issued through the connection line 31 or through another connection line in the interface.

  As described above, if the information for the sensitivity coefficient of the magnetic field detection device 1 is included in the coefficients for various controls executed by the main control device 100, the information is temporarily stored in the memory of the main control device 100. When a fraud such as rewriting one of the coefficients is performed, abnormality is likely to occur in the stored data specific to each ball game apparatus 20 called the sensitivity coefficient and in the darkened data. By collating the data related to the sensitivity coefficient with a normal one, it is possible to increase the probability of finding fraud in data rewriting of the main control unit 100.

  In each of the above embodiments, the sensitivity coefficients in the Z-axis direction, the Y-axis direction, or the Z-axis direction are different from each other, but the sensitivity in directions other than the X, Y, and Z axes is partially increased or suppressed. You can also In this case, it can be implemented by setting a sensitivity coefficient in an arbitrary direction on the three-dimensional coordinates, projecting the sensitivity coefficient on each of the X, Y, and Z axes and assigning the sensitivity coefficient to each axis.

  The magnetic field detection device of the present invention is used for various magnetic field detections in addition to being used for finding illegal games in the ball game device as described above. For example, various game devices, vehicle safety confirmation devices, security devices, and the like.

1, 1A, 1B Magnetic field detection device 2 Magnetic detection unit 3 X-axis sensor 4 Y-axis sensor 5 Z-axis sensor 6 Magnetic field data detection unit 7 Memory 10 Control unit 20 Ball game device 21 Display panel 22 Handle 23 Speaker 24 Solenoid A, B, C, D Sensitivity coefficient G, Ga, Gb, Gc Detection area

Claims (10)

A magnetic detection unit in which an X axis, a Y axis, and a Z axis orthogonal to each other are determined, and a control unit,
The magnetic detection unit is provided with an X-axis sensor that detects a magnetic field in the X-axis direction, a Y-axis sensor that detects a magnetic field in the Y-axis direction, and a Z-axis sensor that detects a magnetic field in the Z-axis direction,
Three-dimensional coordinates are set by the control unit, the direction of the magnetic vector calculated from the detection output of each sensor is specified on the three-dimensional coordinates,
The sensitivity of at least one of the X-axis sensor, the Y-axis sensor, and the Z-axis sensor is different from the sensitivity of the other sensors, and the detection area for detecting the magnetic vector has a three-dimensional coordinate. A magnetic field detection device, wherein the magnetic field detection device is set so as to differ depending on the direction from the origin. Wherein the control unit, the sensitivity coefficient of the particular orientation of the three-dimensional coordinates that is different from the other direction, the magnetic field detecting device according to claim 1, characterized in that is different from the spread of the detection region from the origin. 3. The magnetic field detection according to claim 2, wherein at least one of the sensitivity coefficients of the X-axis, Y-axis, and Z-axis of the three- dimensional coordinates is different from the others, and the extent of the detection region from the origin is made different depending on the direction. apparatus. When the X-axis sensitivity is L, the Y-axis sensitivity is M, the Z-axis sensitivity is N, the X-axis detection output is x, the Y-axis detection output is y, and the Z-axis detection output is z , √ ^{{(L · x) 2 +} (M · y) 2 + (N · z) 2} is the magnetic field detection device according to claim 3 for obtaining a detection output which becomes a predetermined value or more.   The magnetic field detection device according to claim 4, wherein the sensitivities L, M, and N can be freely changed. X axis sensitivity is L, Y axis sensitivity is M, Z axis sensitivity is N, X axis detection output is x, Y axis detection output is y, Z axis detection output is z, disturbance magnetic field X axis And the components of the Y-axis and the Z-axis are “x0”, “y0”, and “z0”, respectively, √ [{L · (x−x0)} ² + {M · (y−y0)} ² + {N · (z The magnetic field detection device according to claim 3, wherein a detection output in which −z0)} ² ] is equal to or greater than a predetermined value is acquired. 4. The magnetic field detection device according to claim 2, wherein sensitivity in any one of the X-axis, Y-axis, and Z-axis directions of the three- dimensional coordinates is eliminated, and the extent of the detection region from the origin is made different depending on the direction. A ball game apparatus equipped with the magnetic field detection device according to claim 1 and capable of detecting an approach of an illegal magnetic field from the outside, wherein the detection area extends within the ball game apparatus . A ball game apparatus that is reduced in an arbitrary direction in consideration of a provided member that generates magnetism.   The ball game apparatus according to claim 8, wherein a host computer that communicates with the control unit is provided, and information about sensitivity is transmitted from the control unit to the host computer.   The host computer instructs the control unit to notify the host computer of information about the sensitivity held by the control unit when the power is turned on, and the information notified from the control unit is sent to the host computer. It is determined whether or not the information matches the information held in advance. If the information matches, the control unit is instructed to start the operation. If the information does not match, it is determined that the control unit is in an abnormal state. The ball game apparatus according to claim 9.

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