JPH0728949B2 - Magnetic detection device in fraud detection device of pachinko machine - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a device for detecting fraudulent activity using a magnet in a pachinko machine.

[Prior art]

2. Description of the Related Art Conventionally, in a pachinko machine, a device has been developed for detecting a fraudulent act in which a player brings a magnet close to the winning opening from the outside and guides the launched pachinko ball to the winning opening by magnetic force. Such a fraud detecting device mainly detects a magnetic field, and a reed switch, a hall element, or the like is used for the sensor.

[Problems to be Solved by the Invention]

The one using the reed switch has a problem in the magnetic field detection sensitivity and cannot be effectively detected. Further, a device using a magnetoelectric conversion element such as a Hall element has an advantage of high detection sensitivity. However, the pachinko machine has a solenoid for opening and closing the winning opening, a motor or solenoid for launching a pachinko ball, a rotation indicator for a variable winning opening,
Other devices such as lamps that generate a large number of magnetic fields are used. For this reason, the magnetoelectric conversion element detects a lot of DC and AC noise magnetic fields, and cannot select and detect only the magnetic field by the external magnet involved in the fraudulent activity. The present invention has been made to solve the above problems, and an object of the present invention is to effectively detect only an external magnetic field involved in fraudulent activity and improve the reliability of the device. .

[Means for solving problems]

The structure of the invention for solving the above-mentioned problems is, as its concept is shown in FIG. 1, a magnetic sensor A for detecting a magnetic field,
A drive signal S4 for driving a magnetic source D of a pachinko machine is input, and a signal output by the magnetic sensor A when the magnetic sensor A detects a magnetic field H generated by the magnetic source D by the drive signal S4. In a fraud detecting device for a pachinko machine, which comprises a level adjusting circuit B for converting into a signal of a level substantially equal to the level and a subtracting circuit C for subtracting the output signal S2 of the level adjusting circuit B from the output signal S1 of the magnetic sensor A. It is a magnetic detection device.

[Action]

The magnetic sensor A is provided, for example, at an arbitrary position on the game board or a control board provided on the back surface thereof, and the output signal S1 thereof is input to the subtraction circuit C. Further, a drive signal S4 for driving a magnetic source D such as a solenoid or a motor is input to the level adjusting circuit B. Since the magnetic field H generated by the magnetic generation source D is proportional to the drive signal S4, the output of the magnetic sensor A sensitive to the magnetic field H generated by the magnetic generation source D changes in proportion to the drive signal S4. Level adjustment circuit B
Outputs a signal S2 at a level equal to the signal level output when the magnetic sensor A detects only the magnetic field H generated from the magnetic generation source D by the drive signal S4. Then, the subtraction circuit C has a signal S1 proportional to all magnetic fields output from the magnetic sensor A and a signal output from the magnetic sensor A when the magnetic sensor A detects only the magnetic field H generated from the magnetic source D. The signal S2 having the same level is input from the level adjusting circuit B, and the subtraction result of the signal S1 and the signal S2 is output as the detection signal S3. As a result, the detection signal S3 output from the subtraction circuit C
The signal level of is only proportional to the external magnetic field E, so that the external magnetic field relating to fraud is accurately detected.

【Example】

Hereinafter, the present invention will be described based on specific examples. FIG. 2 is an external view showing the mechanism of the pachinko machine. 50 is a frame, and the game board 51 is supported by the frame 50. The game board 51 is provided with various winning openings, of which 52, 53 and 54 are specific winning openings. When the specific winning opening is won, the combination operation for determining the winning mode is started. 65 is a special winning opening that is opened / closed according to the winning mode, and the opening / closing door 64 is opened / closed by a solenoid provided inside. At the center of the game board 51, a variable numerical value display 27 and a variable lamp display 29 for displaying a combination state of contingencies when a ball wins a specific winning opening 52, 53, 54 are provided, and the game board A large number of lamps are arranged in the other portion of 51. Further, below the frame body 50, a motor 55 for hitting a pachinko ball is arranged. Thus, there are many magnetic sources in pachinko machines. In such a pachinko machine, hall elements 11 and 12 are arranged at two positions near the specific winning openings 52, 53 and 54 on the control board on the back surface of the game board 51. The electrical configuration of the magnetic detection device is shown in FIG.
The output signal terminals a and b of the hall element 11 are absolute value amplifier circuits 13
It is connected to the. The output signal of the absolute value amplifier circuit 13 is input to the non-inverting input terminal of the subtraction amplifier 40. A solenoid that opens and closes the open / close door 64 as a magnetic source.
A solenoid L2 for driving L1 and other actuating members is provided, and those solenoids L1 and L2 are resistors R3 and R4, respectively.
Power is supplied from the power supply 15 via the. And solenoid L1
And Tr2 to control conduction and non-conduction of L2
r2 is connected in series with solenoids L1 and L2. When the transistors Tr1 and Tr2 are turned on by the control signals S51 and S52, respectively, a drive current flows through the solenoids L1 and L2. The drive signals S41 and S42 proportional to the drive current are output as the voltage across the terminals of the resistors R3 and R4. The drive signal S41, S42
Are input to the inverting input terminals of the inverting amplifiers 21 and 22, respectively, and the non-inverting input terminals of the inverting amplifiers 21 and 22 are
The voltage obtained by dividing the power supply voltage Vcc by the resistors R5 and R6 and the resistors R7 and R8 is input. The amplification factors of the inverting amplifiers 21 and 22 are feedback resistors R9 and R1, respectively.
It can be changed by adjusting the size of 1. Then, this amplification factor is a signal of a level equal to the level of the signal output from the absolute value amplifier circuit 13 when the magnetic fields generated by the solenoids L1 and L2 are detected by the Hall element 11 when the drive signals S41 and S42 are at a certain level. Is preset to be output from the inverting amplifiers 21 and 22. The output signals S21 and S22 of the inverting amplifiers 21 and 22 are input to the inverting input terminal of the subtracting amplifier 40, and the output signal S1 of the absolute value amplifying circuit 13 is input to the non-inverting input terminal of the subtracting amplifier 40. ing. Then, the detection signal S3 is output from the output terminal of the subtraction amplifier 40. In the above configuration, the absolute value amplifier circuit 13 outputs a signal proportional to all the magnetic fields detected by the Hall element 11. Then, the output signal S1 of the absolute value amplifier circuit 13
Contains a signal component proportional to the magnetic field generated by the solenoids L1 and L2. However, since the output signals S21 and S22 of the inverting amplifiers 21 and 22 are equal to the signal components proportional to the magnetic fields generated by the solenoids L1 and L2 included in the output signal S1, they are output from the subtraction circuit 40. The detection signal S3 does not include a signal component proportional to the magnetic field generated by the solenoids L1 and L2. Therefore, the detection signal S3
Is a signal proportional to the external magnetic field related to fraud,
It is possible to accurately detect the approach of the external magnet due to cheating. Also, the detection circuit using the hall element 12 can be configured in the same manner as the detection circuit using the hall element 11. In the above embodiment, the drive signals S41 and S42 are currents that are proportional to the drive currents of the solenoids L1 and L2. If neglected, transistor Tr
The control signals S51 and S52 for 1 and Tr2 may be used as the drive signals S41 and S42.

【The invention's effect】

The present invention inputs a drive signal for driving a magnetic source of a pachinko machine, and when the magnetic sensor detects a magnetic field generated by the magnetic source by the drive signal, a level substantially equal to a signal level output by the magnetic sensor. Since it has a level adjusting circuit for converting into a signal of the magnetic sensor and a subtracting circuit for subtracting the output signal of the level adjusting circuit from the output signal of the magnetic sensor, the output of the magnetic source of the pachinko machine from the detection signal of the magnetic field. The signal component proportional to the applied magnetic field is removed. Therefore, it is possible to detect only the approach of the external magnet related to the intended misconduct from among many noise magnetic fields, so that the reliability of the magnetic detection device is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the concept of the present invention.
FIG. 2 is an external view of a pachinko machine provided with a magnetic detection device according to a specific embodiment of the present invention. FIG. 3 is an electric circuit diagram showing an electric configuration of the magnetic detection device according to the embodiment. 11, 12 …… Hall element, 21, 22 …… Inverting amplifier, 40 ……
Subtraction amplifier, 50 ... Frame, 51 ... Game board, 52,53,54 ...
… Specific prize hole, 65 …… Big prize hole, 55 …… Motor

Claims (1)

[Claims] 1. A magnetic sensor for detecting a magnetic field and a drive signal for driving a magnetic generation source of a pachinko machine are input,
From the output signal of the magnetic sensor, a level adjusting circuit that converts the magnetic field generated by the magnetic generation source by the drive signal into a signal of a level substantially equal to the signal level output by the magnetic sensor when the magnetic sensor detects the magnetic field. A magnetic detection device in a fraud detection device of a pachinko machine, which comprises a subtraction circuit for subtracting the output signal of the level adjustment circuit.