JPH0824739B2 - Pachinko machine prize detection device - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prize detecting device for a pachinko machine that detects a pachinko ball that has won a prize, and more particularly, to a device that prevents erroneous detection of a pachinko ball by an external radio wave such as a transceiver.

[Prior art]

In a pachinko machine, for example, a device described in Japanese Utility Model Laid-Open No. 60-190376 is known as a device for detecting a pachinko ball (hereinafter, simply referred to as a "winning ball") that has won a prize. In this device, an air-core coil is used as a coil, and the passing direction of the winning ball and the axis of the air-core coil are parallel to each other so that the winning ball passes through the inside of the air-core coil. Further, the diameter of the coil is configured to be at least larger than the diameter of the pachinko ball so that the winning ball can pass through. Then, when the winning ball passes through the air-core coil, the metal ball existing in the air-core coil increases the inductance of the coil, thereby increasing the Q value of the oscillation circuit and oscillating. Therefore, the case where the signal level of the oscillation frequency of the oscillation circuit is high corresponds to the passage of the winning ball.

[Problems to be Solved by the Invention]

However, in such a conventional detection device, since the diameter of the coil is large, it is easy to receive radio waves from a transceiver or the like, and the radio waves increase the signal level of the oscillation circuit.
There is a problem that a winning ball is erroneously detected as a winning ball even if there is no winning ball. It is an object of the present invention to prevent erroneous detection of winning spheres due to external radio waves or the like in the winning sphere detection device.

[Means for Solving the Problems]

The configuration of the invention for solving the above-mentioned problems is a frame having a passage hole through which a pachinko sphere passes, a coil disposed in the passage hole, the impedance of which changes by the passage of the pachinko sphere, and a coil. An oscillation circuit including as an excitation element,
In a prize detection device of a pachinko machine that detects passage of a pachinko ball by a signal level of an oscillation circuit, a columnar portion around which a coil is wound, and the columnar portion is integrally formed on the end face of the columnar portion, It has a ferrite core consisting of a detection surface with a cross-sectional area larger than the cross-sectional area, the axis of the columnar part of the ferrite core is perpendicular to the passage direction of the pachinko ball, and the detection surface becomes part of the side wall surface of the passage hole. As described above, the ferrite core is arranged on the frame body, and the oscillation circuit is set to be in an oscillation state when the pachinko ball does not pass through the passage hole and to be in an oscillation stop state when the pachinko ball passes through the passage hole. It is characterized by being

[Action]

In this detection device, the coil is wound around the ferrite core, so that the coil is downsized. In the ferrite core, since the area of the detection surface facing the pachinko ball is larger than the cross-sectional area of the columnar part around which the coil is wound, the detection sensitivity is high. The miniaturized coil is arranged such that, on the side wall of the passage hole, the axis of the coil is perpendicular to the passing direction of the pachinko ball and the detection surface constitutes a part of the side wall surface of the frame. Therefore, the coil having such an arrangement has a directivity in which the magnetic field is sensitive only to the radio wave that is horizontally polarized on the ground and is incident from the side circumference of the coil. For example, if the axis of the coil is oriented in a direction perpendicular to the glass surface of the pachinko machine, it will not be sensitive to radio waves incident from a direction perpendicular to the glass surface of the pachinko machine. As a result, malfunctions of the transceiver and the like due to external radio waves are reduced. Also, the oscillation circuit is set to oscillate when the pachinko ball does not pass through the passage hole, and is set to stop oscillation when the pachinko ball passes through the passage hole, so that even if an external radio wave such as a transceiver is Since the oscillation does not stop even if it is incident, it is not erroneously determined that the pachinko ball has passed. Further, since the side peripheral portion of the coil can be easily shielded by a metal tube or the like, by shielding the side peripheral portion, it is possible to shield the electromagnetic waves coming from the side peripheral portion of the coil.

【Example】

Hereinafter, the present invention will be described based on specific examples. In FIG. 1 of a perspective view of a winning detection device 20 of a pachinko machine according to the present invention, the winning detection device 20 has a frame body 21 in which a passage hole 23 is partially formed, and a base portion 22 and a frame thereof. Lid 22a
Thus, the circuit board 26 that constitutes the sphere detection circuit 34 is built in. A power supply line 28 connected to a power source and a signal line 29 for outputting a winning signal are drawn out from a circuit board 26 built in the base 22 of the frame 21. The main winning detection device 20,
Power is supplied from the power supply line 28, and a winning detection signal from the ball detection circuit 34 is output from the signal line 29. On the side wall 24 of the passage hole 23 of the frame body 21, the ferrite core 25a
The coil 25 wound around is embedded so that its axis 25b is perpendicular to the axis 23a of the passage hole 23 which is the passing direction of the winning ball B. The end of the ferrite core 25a that perpendicularly forms the magnetic field is a circle with a side of 4.5 mm.
The wound part of is a circle with a diameter of 2.5 mm and the length is 4 mm. The inductance 25 of the coil 25 is 470 μH.
The thickness of the passage hole 23 in the direction of the axis 23a is about 6 mm. coil
The size of 25 is designed so as not to impair the detection sensitivity of winning balls. The front surface 24a of the side wall 24 is open. When the winning detection device 20 is mounted on the pachinko machine, the front surface 24a is closed by one surface of a guide gutter (not shown) that guides the winning ball. As a result, the obstacle due to the side wall of the passage hole 23 is eliminated in the passage of the guide gutter. The winning detection device 20 is arranged in a direction in which the axis 25b of the coil 25 is perpendicular to the glass surface (not shown) on the front surface of the pachinko machine. Thus, in the present invention, the coil 25 is designed to be small,
Since the axis 25b is arranged perpendicularly to the passing direction of the winning ball B, it is insensitive to the electromagnetic wave incident from the end face direction of the coil 25. That is, directivity occurs in the radio wave reception of the coil 25. In particular, by arranging the winning detection device 20 so that the axis 25b of the coil 25 is perpendicular to the glass surface of the front of the pachinko machine, the electromagnetic wave in the direction perpendicular to the glass surface where the electromagnetic wave is most likely to arrive is Can be made insensitive. Also, by covering the side portion 25C of the coil 25 with a metal tube,
It is possible to shield against electromagnetic waves incident from the side portion 25C. The sphere detection circuit 34 and the signal processing circuit 50 are configured as shown in FIG. The sphere detection circuit 34 includes an oscillation circuit 31, a detection circuit 32, and a waveform shaping circuit 33.
The coil 25 is connected to 31. The specific circuit configuration of the ball detection circuit 34 is shown in FIG. The transistor Tr1 is an oscillation transistor, the transistor Tr2 is a detection transistor, the capacitor C1 and the resistors R4 and R5 are a detection capacitor and a resistor, respectively, and the transistor Tr3 is a waveform shaping transistor. . When the transistor Tr1 is oscillating,
The transistor Tr2 is turned on / off at a half cycle of the oscillation signal, the capacitor C1 is charged, and when the voltage exceeds a predetermined value, the transistor Tr3 is turned on and a detection current is output. The value of the inductance of the coil 25 is set so that the transistor Tr1 is in an oscillating state when there is no winning ball. When a winning ball exists, an eddy current is generated in the winning ball B by electromagnetic induction, and the resistance of the coil 25 increases due to the eddy current loss, the loss of the oscillation circuit increases, and the oscillation stops. When the oscillation is stopped, the transistor Tr1 is turned off, the transistor Tr2 is turned off, the transistor Tr3 is turned off, and the output current stops flowing. The signal processing circuit 50 on the control device side, which is connected to the present winning detection device 20, is a series circuit of a resistor R1 and a resistor R2 to which the signal line 29 is connected, and a transistor Tr4 for inputting a signal at the dividing point.
And an inverter IV for inputting its collector terminal voltage. The power supply line 28 is connected to the 24V power source, and the signal line 29 is grounded via the series connection of the resistors R1 and R2. The current is supplied to the sphere detection circuit via the power supply line 28, and is fed back via the signal line 29 and the resistors R1 and R2. That is, the winning detection device 20 of the present invention is used as a serial two-terminal element,
The resistance between the two terminals changes in a binary manner upon detection of a winning ball. In this way, with the signal processing circuit 50 on the control device side connected, the winning detection device 20 of the present embodiment operates as follows. When the winning ball B does not pass near the coil 25, the oscillation circuit 31 oscillates at a predetermined frequency, but when the winning ball B passes near the coil 25, the eddy current induced in the winning ball B causes The loss increases, and the oscillation circuit 31 stops oscillation. The signal S1 is input to the detection circuit 32,
The envelope is detected. The detected signal S2 is input to the waveform shaping circuit 33 and shaped into a rectangular wave. Therefore, the output S3 of the waveform shaping circuit 33 is at a high level in the normal state where the winning ball B is not detected, and becomes low level when the winning ball B is detected. The signal S4 at the connection point between resistors R1 and R2 is
The transistor Tr4 is turned on / off in proportion to S3 and according to the signal level of the signal S4. Since the collector signal of the transistor Tr4 is inverted by the inverter IV, its output signal S5
Corresponds to the signal S3. In this way, the passage of the winning ball B can be taken out as an on / off signal. As described above, the detection signal output from the winning detection device 20 is a high-level and low-level binary signal, and the signal of the corresponding level is output only during the time when the winning ball B passes the sensor section of the device. That is. Then, the winning ball B is detected by the level fluctuation of the signal from the high level to the low level or vice versa.

【The invention's effect】

In the present invention, the coil is wound around the ferrite core, and the area of the detection surface facing the pachinko ball is larger than the cross-sectional area of the columnar portion around which the coil is wound, so the size is reduced and the detection sensitivity is increased. . Further, the coil is arranged on the side wall of the passage hole such that the axis of the coil is perpendicular to the passing direction of the pachinko ball and the detection surface constitutes a part of the side wall surface of the frame. Therefore, the coil having such an arrangement has a directivity in which the magnetic field is sensitive only to the radio wave that is horizontally polarized on the ground and is incident from the side circumference of the coil.
It is possible to reduce the sensitivity of the transceiver or the like to an external electric field. In particular, if the axis of the coil is perpendicular to the glass surface of the pachinko machine, it is possible to make it insensitive to the direction perpendicular to the glass surface of the pachinko machine, which receives the most radio waves. Also, the oscillation circuit is set to oscillate when the pachinko ball does not pass through the passage hole, and is set to stop oscillation when the pachinko ball passes through the passage hole, so that even if an external radio wave such as a transceiver is Since the oscillation does not stop even if it is incident, it is not erroneously determined that the pachinko ball has passed. Further, by shielding the side peripheral portion of the coil with a metal tube or the like, it is possible to make the coil insensitive to the direction perpendicular to the side peripheral portion of the coil.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a winning detection device for a pachinko machine according to a specific embodiment of the present invention. FIG. 2 is a block diagram showing an electrical configuration of the winning detection device according to the embodiment. FIG. 3 is a circuit diagram showing a concrete circuit configuration of the apparatus of the embodiment. 20 ... prize detection device, 21 ... frame, 23 ... passage hole, 24 ...
… Side wall, 25 …… Coil, 26 …… Circuit board

Claims (1)

[Claims] 1. A frame body having a passage hole through which a pachinko ball passes, a coil disposed in the passage hole, the impedance of which changes when the pachinko ball passes, and the coil as an excitation element. An oscillation circuit, and a winning detection device of a pachinko machine that detects passage of the pachinko ball by a signal level of the oscillation circuit, wherein a columnar portion around which the coil is wound, and an end surface of the columnar portion integrally with the columnar portion. And a ferrite core comprising a detection surface having a cross-sectional area larger than the cross-sectional area of the columnar portion, the axis of the columnar portion of the ferrite core is perpendicular to the passing direction of the pachinko ball, the detection surface is The ferrite core is disposed on the frame so as to be a part of the side wall surface of the passage hole, and the oscillation circuit is in an oscillating state when the pachinko ball does not pass through the passage hole. Ri, winning detecting device of the pachinko machine, characterized in that the pachinko ball is set such that the oscillation stop state when passing through the passage hole.