JPS6397185A - Injustice detector of pinball machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field]

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

[Prior art]

Conventionally, in a pachinko machine, a device has been developed for detecting fraudulent activity in which a player brings a magnet close to a winning hole from the outside and guides the ejected pachinko balls to the winning hole using magnetic force. Such fraud detection devices mainly detect magnetic fields, and use reed switches, Hall elements, etc. as sensors.

[Problems to be solved by the invention]

Those using reed switches had problems with magnetic field detection sensitivity and could not perform effective detection. Furthermore, those using a magnetoelectric conversion element such as a Hall element have the advantage of high detection sensitivity. However, a pachinko machine has a solenoid for opening and closing the winning opening, a motor or solenoid for launching the pachinko ball, a rotation indicator for the variable winning opening,
Other devices that generate a large number of magnetic fields, such as lamps, are used. For this reason, the magnetoelectric conversion element detects many direct current and alternating current noise magnetic fields, making it impossible to selectively detect only the magnetic field caused by an external magnet associated with fraudulent activity. The present invention is based on the above l? , '18, and its purpose is to effectively detect only external magnetic fields related to fraudulent acts and improve the reliability of the device.

[Means to solve the problem]

As shown in FIG. 1, the configuration of the invention for solving the above problems includes a plurality of magnetic sensors A1 to Δn provided at a plurality of locations on the game board for detecting magnetic fields, and the magnetic sensor a plurality of waveform shaping circuits B1 that input each output signal and binarize the output signal with a predetermined level as a threshold;
~Bn, a time difference calculation means C which inputs each output signal of the waveform shaping circuit and outputs a time difference signal according to a time difference in level transition timing of each signal, and a time difference signal outputted from the time difference calculation means. A determining means is provided for inputting the input signal and outputting a determining signal when the time difference is larger than a reference value.

[Effect]

The magnetic sensors A1 to Δn are provided at different locations on the game board, and their output signals are sent to the respective waveform shaping circuits B1 to B1.
Enter Bn. Each waveform shaping circuit outputs a binary signal to the time difference calculation means C by using a predetermined level as a threshold value for the input signal inputted from each magnetic sensor. The time difference calculation means C inputs each output signal of each waveform shaping circuit, calculates the time difference between the level transition timings of each signal, and outputs a time difference signal to the determination means. The determination means inputs this time difference signal and outputs a determination signal when the time difference is larger than a reference value. This determination signal is an external magnet detection signal, that is, a fraud detection signal, and serves as an input signal to an alarm device or the like.

【Example】

The present invention will be described below based on specific examples. FIG. 2 is an external view showing the mechanism of the pachinko machine. 50
is a frame body, and a game board 51 is supported by the frame body 50. The game board 51 is provided with various winning holes, of which 52, 53, and 54 are specific winning holes. When a prize is won in that particular winning hole, a combination operation that determines a winning mode is started. Reference numeral 65 is a grand prize opening that opens and closes depending on the winning mode, and an opening/closing door 64 is opened and closed by a solenoid provided inside. In the center of the game board 51, a variable numerical value display 27 and a variable lamp display 29 are arranged to display a chance combination state when a ball wins in a specific winning hole 52, 53, 54,
A large number of lamps are arranged in other parts of the game board 51. Furthermore, a motor 55 for launching pachinko balls is disposed below the frame 50. As described above, there are many magnetic sources in a pachinko machine. In such a pachinko machine, Hall elements 11 and 12 are arranged on the control board on the back side of the game board 51 at two locations near the specific winning openings 52, 53, and 54. The electrical configuration of this detection device is shown in FIG. The output signal terminals a and b of the Hall element 11 are connected to the absolute value amplification circuit 21
It is connected to the. The output signal of the absolute value amplification circuit 21 is input to the non-inverting input terminal of the comparator 31. Further, the Hall element 12 also has a similar circuit configuration. The outputs of the comparators 31 and 32 are input to an exclusive OR gate (hereinafter referred to as rEXOR gate) 4o, and the output of the EXOR gate 40 is input to a sawtooth wave generation circuit 41. Then, the sawtooth wave generation circuit 41
The output is input to the inverted terminal of the comparator 42. The output of the comparator 42 is input to the set terminal of the latch circuit 43, and the Q terminal of the latch circuit 43 outputs a determination signal, that is, a fraud detection signal. In this embodiment, the waveform shaping circuit is an absolute value amplifier circuit 21.2.
2 and comparators 31 and 32, the time difference calculation means consists of an EXOR gate 4o and a sawtooth wave generation circuit 41, and the determination means consists of a comparator 42 and a latch circuit 4.
It is composed of 3. Next, the operation of this device will be explained. As shown in FIG. 4(a), the output signals of the Hall elements 11 and 12 vary linearly with respect to the magnetic flux density B in the detection range, and the polarity of the output signal is reversed depending on the polarity of the magnetic field. To detect fraud, it is only necessary to detect the approach of an external magnet, and there is no need to detect the polarity of the magnetic field. Therefore, the output signals of the Hall elements 11 and 12 are converted into absolute value detection signals by the absolute value amplification circuits 21 and 22. converted. Further, the detection signal for the distance l between the external magnet and the Hall element 11.12 is the fourth
It changes as shown in Figure (b). Furthermore, the way the magnet moves when a fraudulent act is carried out depends on the external magnet and the Hall element 11.
It is considered that the distance l to 12 changes with respect to time t as shown in FIG. 4(C). Therefore, the waveform of the detection signal from the Hall elements 11 and 12 is as shown in FIG. 4(d). This detection signal is input to the comparators 31 and 32 and compared with the threshold voltage Vhl, and when the detection signal exceeds the threshold voltage Vhl, it becomes a low level and the detection signal becomes the threshold voltage Vhl.
A pitch lower than l is binarized to a high level. Therefore, when the magnet moves as shown in Figure 4(c), the output signals of the comparators 31 and 32 are as shown in Figure 4(e).
As shown in the figure, the waveforms become rectangular waves X (solid line) and Y (broken line), respectively. In other words, the level is low when the magnet is close to the Hall element 11, 12, and the level is high when the magnet is moving away. However, since the Hall element 11 and the Hall element 12 are arranged at different positions on the game board 51, the magnet does not approach or move away from the two Hall elements 11 and 12 in exactly the same positional relationship. Therefore, the magnitude of the magnetic field detected by those elements causes a time lag, and the time at which the detection signal crosses the threshold voltage Vhl, that is, the time at which the level of the output signals of the comparators 31 and 32 transitions, differs. , a time difference occurs in the transition time. Since the outputs of the comparators 31 and 32 are input to the EXOR gate 40, the output signal of the EXOR gate 40 becomes as shown in FIG. 4(f). That is, the output signal of the EXOR gate 40 is at a high level during the time difference period. The output signal of this EXOR gate 40 is input to a sawtooth wave generation circuit 41, and the sawtooth wave generation circuit 41 generates a sawtooth wave that increases linearly while the input signal is at a high level, as shown in FIG. 4(g). It is input to the comparator 42. The sawtooth wave output from the sawtooth wave generation circuit 41 is compared with a threshold voltage Vh2 by a comparator 42, and when the sawtooth wave exceeds this threshold voltage Vh2, the output of the comparator 42 becomes a low level. As a result, the latch circuit 43 is set, the Q terminal of the latch circuit 43 becomes high level, and a fraud detection signal is output. In this way, when the time difference becomes larger than a predetermined value, a fraud detection signal is output. By the way, this time difference is due to the fact that the magnet is connected to the Hall detection element 11.
12 is inversely proportional to the speed at which it approaches or moves away from it. Since various magnetic field generation sources are stationary, even if the noise magnetic fields generated from these sources are detected by the Hall elements 11 and 12,
Since the time difference is the difference in propagation time of radio waves, it is much smaller than the above-mentioned time difference. Therefore, by providing a threshold value for determining the time difference, it is possible to eliminate the influence of the noise magnetic field. In the above embodiment, the sawtooth wave generation circuit 41 is used to calculate the time difference, but a counter 45 may also be used as shown in FIG. While this counter 45 is receiving a low level signal, the count value is reset to O, but while receiving a high level signal, it counts the pulse signal output from the oscillator 46. And counter 45
The overflow signal is input to the latch circuit 48, the latch circuit 48 is set, and the fraud detection signal is output from the Q terminal. The initialization circuit 47 is a circuit that resets the counter 45 and the latch circuit 48 when the pachinko machine starts operating. Further, the time difference calculating means and determining means may be constituted by a microprocessor used for controlling winning balls, generating random numbers, etc.

【Effect of the invention】

The present invention includes a plurality of magnetic sensors, a plurality of waveform shaping circuits that binarize each output signal of the magnetic sensors with a predetermined level as a threshold, and a time difference in the transition timing of the level of each output signal of the waveform shaping circuit. Since it is equipped with a time difference calculating means to calculate the time difference and a judgment means that outputs a judgment signal when the time difference is larger than a reference value, it is possible to detect only the approach of the target external magnet from among many noise magnetic fields. can. Therefore, the reliability of the detection device was improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the concept of the present invention. FIG. 2 is an external view of a pachinko machine equipped with a fraud detection device according to a specific embodiment of the present invention. FIG. 3 is an electrical circuit diagram showing the electrical configuration of a fraud detection device according to an embodiment. FIG. 4 is a characteristic diagram for explaining the operation of the device. FIG. 5 is an electrical circuit diagram showing the electrical configuration of a fraud detection device according to another embodiment. 11.12°-Hall element 50--Frame 51-Game board 52.53.54 -Specific prize opening 65--Big prize opening 55゛Motor patent applicant Sanyo Bussan Co., Ltd. Patent attorney Osamu Fujitani ^41 / ni71 beg) 4 evil

Claims (1)

[Claims] A plurality of magnetic sensors that detect magnetic fields provided at a plurality of locations on a game board; each output signal of the magnetic sensor is input, and the output signal is converted into a binary value with a predetermined level as a threshold value. a plurality of waveform shaping circuits that input each output signal of the waveform shaping circuit and output a time difference signal according to a time difference in level transition timing of each signal; and an output of the time difference calculation means. A fraud detection device for a pachinko machine, comprising: determining means for inputting a time difference signal, and outputting a determination signal when the time difference is larger than a reference value.