JP2013066757A - Game machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a game machine, in which damage to a sound control unit can be prevented when an overcurrent is generated by the separation of a connector, wherein a speaker and the sound control unit are connected by a drawer connector.SOLUTION: The game machine has speakers 10c and 10d, which are provided in an outer frame, the sound control unit 300, which is provided in an intermediate frame and outputs an audio signal to the speakers 10c and 10d, an intermediate frame side connector 301a, which is provided in the intermediate frame and is electrically connected to the sound control unit 300, and an outer frame side connector 301b, which is provided in the outer frame and is electrically connected to the speakers 10c and 10d, and is provided with the drawer connector 301, in which the intermediate frame opens and closes in relation to the outer frame and thereby the intermediate frame side connector 301a and the outer frame side connector 301b are electrically separated and connected, and protective circuits 302 and 303, which are provided in wiring which connects the sound control unit 300 and the intermediate frame side connector 301a.

Description

The present invention relates to a gaming machine such as a pachinko machine or an arrangement ball machine provided with a payout device for paying out game balls.

Conventionally, sound effects are output from a speaker as a game progresses. In recent years, in order to improve sound quality and volume, speakers have been provided at the lower part of the gaming machine in addition to the upper part of the gaming machine, and the speaker at the lower part of the gaming machine can be provided on the curtain of the outer frame. Is preferred. Since the middle frame provided with the voice control unit can be opened and closed with respect to the outer frame, the voice control unit and the speaker are connected using a relatively long wire harness. A gaming machine in which a connector is interposed between the wire harnesses has been proposed (see Patent Document 1). With such a configuration, when the inner frame opens beyond the length of the wire harness with respect to the outer frame, disconnection of the wire harness can be avoided by disconnecting the connector.

JP 2003-154137 A

However, in the configuration of Patent Document 1, when closing the middle frame, there is a possibility that the wire harness is sandwiched between the middle frame and the outer frame, and when the connector is removed, it is necessary to reconnect the connector. Become. For this reason, it is conceivable to use a drawer connector to connect the audio control unit and the speaker, thereby eliminating the wire harness and separating and connecting the connector with the opening and closing of the inner frame.

By the way, when troubles such as ball clogging occur during a game, the middle frame is released with the power turned on to solve the trouble, and then the middle frame is closed to continue the game. Yes. For this reason, in a configuration employing a drawer connector, if the middle frame is opened at a timing when a loud sound is being output from the speaker, an overcurrent will flow back to the voice control unit side, and the voice control unit etc. Electronic components may be damaged.

Therefore, in view of the above points, the present invention prevents a voice control unit from being damaged when an overvoltage occurs due to electrical separation of the connector in a gaming machine that connects a speaker side and a voice control unit side with a drawer connector. Objective.

In order to achieve the above object, in the gaming machine of the present invention,
Speakers,
An audio control unit for outputting an audio signal to the speaker;
A first connector electrically connected to the voice control unit; and a second connector electrically connected to the speaker, wherein the first connector and the second connector can be electrically separated and connected. A drawer connector,
A protection circuit provided between the voice control unit and the first connector,
The protection circuit is configured such that in the frequency band of the audio signal output from the audio control unit as the game progresses, the impedance decreases as the frequency of the audio signal increases, and from the impedance of the speaker The protection circuit has a higher impedance.

By providing the protection circuit in this way, even if the electrical contact between the first connector and the second connector is separated in a state where a loud sound is output from the speaker, the contact of the second connector It is possible to prevent a current due to the generated back electromotive voltage from flowing to the voice control unit, and to protect the voice control unit. In the frequency band of the audio signal used in the gaming machine of the present invention, the protection circuit has a lower impedance as the frequency of the audio signal increases, and the frequency band of the audio signal used in the gaming machine of the present invention Since the impedance of the speaker is smaller than the impedance of the protection circuit, the normal audio signal as designed is normal when the middle frame side connector and the outer frame side connector are connected (connector connection state). Is output, that is, the current from the audio control unit related to the audio signal flows mainly to the speaker side instead of the protection circuit. Thereby, even in the configuration provided with the protection circuit, it is possible to reduce the audio output loss of normal audio signals at the normal time and maintain high-quality audio output.

In order to achieve the above purpose, in other gaming machines,
An outer frame fixed to the island facility,
A middle frame that can be opened and closed with respect to the outer frame;
A speaker provided on the outer frame;
An audio control unit provided in the middle frame and outputting an audio signal to the speaker;
An inner frame side connector provided on the inner frame and electrically connected to the voice control unit; and an outer frame side connector provided on the outer frame and electrically connected to the speaker. A drawer connector for electrically separating and connecting the middle frame side connector and the outer frame side connector by opening and closing with respect to the outer frame;
A protection circuit provided in a wiring connecting the voice control unit and the middle frame side connector,
The protection circuit is configured such that in the frequency band of the audio signal output from the audio control unit as the game progresses, the impedance decreases as the frequency of the audio signal increases, and from the impedance of the speaker The impedance of the protection circuit may be higher.

By providing the protection circuit in this way, even when the middle frame is opened and the middle frame side connector and the outer frame side connector are separated while a loud sound is being output from the speaker, the middle frame side connector It is possible to prevent the current due to the back electromotive voltage generated at the contact point from flowing to the voice control unit, and to protect the voice control unit. In the frequency band of the audio signal used in the gaming machine of the present invention, the protection circuit has a lower impedance as the frequency of the audio signal increases, and the frequency band of the audio signal used in the gaming machine of the present invention Since the impedance of the speaker is smaller than the impedance of the protection circuit, the normal audio signal as designed is normal when the middle frame side connector and the outer frame side connector are connected (connector connection state). Is output, that is, the current from the audio control unit related to the audio signal flows mainly to the speaker side instead of the protection circuit. Thereby, even in the configuration provided with the protection circuit, it is possible to reduce the audio output loss of normal audio signals at the normal time and maintain high-quality audio output.
In addition, when the connector is connected, high-frequency noise exceeding the normal audio signal frequency band (
When this occurs, the ratio of the current related to the high-frequency noise absorbed (flowed) to the protection circuit side having a high impedance is increased, whereby the noise can be removed. . That is, while reducing output loss of normal audio signal as much as possible,
When high-frequency noise occurs, the noise can be removed as much as possible.

In addition, the higher the frequency, the smaller the impedance of the protection circuit,
When an overvoltage (easily generated at a high frequency) such as a counter electromotive voltage occurs, it is possible to prevent the impedance of the protection circuit from becoming higher than the impedance of the voice control unit. When a back electromotive voltage is generated at the contact of the middle frame side connector or the like when the middle frame is opened (connector open state), the current generated by the back electromotive voltage surely flows to the protection circuit side. Can be.
In another gaming machine, the protection circuit includes a resistor and a capacitor.
The middle frame side connector and the outer frame side connector may be connected in parallel to the speaker in a state of being electrically connected.

According to the protection circuit having such a configuration, even when a counter electromotive voltage is generated at the contact of the middle frame side connector, the counter electromotive voltage is consumed as thermal energy, and a rapid voltage increase can be suppressed.

According to the configuration of the present invention, in the gaming machine in which the speaker side and the voice control unit side are connected by the drawer connector, the voice control unit can be prevented from being damaged when an overvoltage is generated due to the electrical separation of the connector.

1 is a front view of a gaming machine according to an embodiment to which the present invention is applied. It is a block diagram which shows the schematic apparatus of an electronic controller. It is a circuit diagram which shows the relationship between an amplifier circuit and a speaker. It is a perspective view of a connector. It is a perspective view which shows the state which open | released the middle frame with respect to the outer frame. It is explanatory drawing which shows the relationship between the frequency and impedance of a lower speaker and a protection circuit.

Embodiments in which the present invention is applied to a pachinko machine will be described below with reference to the drawings. FIG.
It is a front view of the gaming machine 1 (pachinko machine) of the present embodiment. As shown in FIG. 1, the front portion of the gaming machine 1 includes a main body frame 2, a middle frame 3, a front frame 4, an upper plate portion 5, a lower plate portion 6, a locking device 9, a game board 20, and the like. The game board 20 has a gate through which game balls can pass, a game entrance to which game balls can enter (such as a start entrance, a big prize entrance, a general prize entrance, etc.) and a game to a specific entrance. There are a symbol display device that displays a symbol variation effect when a ball enters, and a number of obstacle nails, etc.
In FIG. 1, the details of the board surface configuration of the game board 20 are not shown. Further, the middle frame 3 is not clearly shown in FIG. 1 because the front frame 4 and the like are arranged on the front side.

The main body frame 2 is an assembly of wooden plate-like bodies in a substantially rectangular frame shape, and constitutes an outer frame of the gaming machine 1. The outer frame 2 is fixed to an island facility where a plurality of gaming machines 1 are arranged side by side. Middle frame 3
Is made of plastic, is fitted inside the main body frame 2 and is pivotally supported at the left end so as to be openable and closable with respect to the outer frame 2. The middle frame 3 has a frame portion that occupies about 2/3 of the upper side and a lower side 1
The lower plate occupies about / 3. The game board 20 and the front frame 4 are provided so as to overlap each other on the front side of the frame body part, and the upper plate part 5 and the lower plate part 6 are provided on the front side of the lower plate part. The game board 20 is a substantially rectangular wooden plate-like body and is detachably attached to the front surface side of the middle frame 3, and its back side is covered by a back mechanism board (not shown). In the lower plate portion, a launching unit (not shown) constituting launching means for launching a game ball onto the game board 20
A ball feeding device (not shown) for supplying game balls to the launching device unit is provided.

The front frame 4 is disposed on the front side of the middle frame 3 and is supported at the left end of the middle frame 3 so as to be opened and closed.
The front frame 4 is made of plastic, and a circular opening 4a is formed in order to make the board surface of the game board 20 arranged on the back side visible. A substantially rectangular transparent plate frame (not shown) including a transparent plate such as a glass plate corresponding to the opening 4a is attached to the back surface of the front frame 4. Lamps such as LEDs (not shown) are provided around the game board 20 in the front frame 4. These lamps are turned on / off or blinking as the game progresses in order to enhance the gaming effect.

The upper plate part 5 is provided on the lower side of the front frame 4 and is supported at the left end of the middle frame 3 so as to be opened and closed.
The upper dish part 5 includes a dish outer edge part 5a, a discharge port 5b for discharging game balls from the inside of the gaming machine 1, and a ball release button 5c for discharging the game balls of the upper dish part 5 to the lower dish part 6. It has. Dish outer edge 5
On the upper surface of a, an effect button 5d, a ball rental button 5e, and the like are provided.

The lower plate part 6 is provided below the upper plate part 5. A discharge port 6 a for discharging game balls from the inside of the gaming machine 1 to the lower plate portion 6 is provided in the approximate center of the lower plate portion 6. An ashtray 7 is provided at the left end of the lower dish portion 6. At the right end of the lower plate part 6, a launching handle 8 is provided for a player to operate a launching device unit (not shown). The firing handle 8 is provided with a touch switch 8a for detecting that the player is touching. On the left side surface of the launch handle 8, a launch stop switch 8b that is operated by the player to temporarily stop the launch of the game ball is disposed.

The locking device 9 is provided at the center of the right end of the middle frame 3 and is used to lock the front frame 4 when it is closed.

The gaming machine 1 also has speakers 10a to 10 for generating sound effects corresponding to the gaming state.
10d is provided. The speakers 10 a to 10 d are composed of upper speakers 10 a and 10 b provided at the upper part of the gaming machine 1 and lower speakers 10 c and 10 d provided at the lower part of the gaming machine 1. The upper speakers 10 a and 10 b are disposed on the front frame 4 fixed to the middle frame 3, and the lower speakers 10 c and 10 d are provided on a curtain plate fixed to the front side of the outer frame 2. For this reason,
When the middle frame 3 is opened with respect to the outer frame 2, the upper speakers 10a and 10b move together with the middle frame 3, while the lower speakers 10c and 10b do not move. In addition, gaming machine 1
A prepaid card unit 13 (CR unit) is mounted on the left side of. In addition,
The “outer frame” of the present invention includes an outer frame 2 main body and a curtain fixed to the main body.

Next, the electronic control device of the gaming machine 1 of this embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating a schematic configuration of the electronic control device. The electronic control device shown in FIG.
Is disposed on a back mechanism board (not shown). Although not shown, the back mechanism board is provided with a prize ball tank for storing game balls and a tank rail for supplying the game balls stored in the prize ball tank to the game ball payout device. The “inner frame” of the present invention includes not only the main body of the inner frame 3 but also a back mechanism board that moves together with the inner frame 3 by opening and closing the inner frame 3 with respect to the outer frame 2.

As shown in FIG. 2, the electronic control unit includes a main control unit 200 and sub-control units 230, 260, and 280 connected to the main control unit 200. The sub control unit includes a payout control unit (prize ball control unit) 230, a sub control unit 260, and an effect display control unit 280.
The main control unit 200 includes a main control board 200a, and the sub control units 230, 260, and 280 serve as peripheral control boards, a payout control board 230a, a sub control board 260a, and an effect display control board 28.
0a is provided.

The main control unit 200 constitutes a main control unit that controls the progress of the game.
A command signal (command data) for instructing processing contents is transmitted to 30, 260, and each sub-control unit 2
Reference numerals 30, 260, and 280 are configured to perform various controls based on the command signal.

The CPU 200b of the main control board 200a constituting the main control unit 200 includes a CPU core, a built-in RAM (hereinafter simply referred to as RAM), a built-in ROM (hereinafter also simply referred to as ROM), etc., and is stored in the ROM. The control program controls operation of the entire gaming machine 1 (basic progress control of the game) using the RAM as a work area. Note that the main control board 200 of the present embodiment.
The control cycle of the CPU 200b of a is set to 2 ms.

The payout control board 230a constituting the payout control unit 230 is the CPU 2 of the main control board 200a.
CPU 230b having the same configuration as 00b is provided. To the payout control unit 230, the launch control unit 250, the CR unit 13, and the like are connected.

When a game ball enters a variety of entrances (such as a start entrance and a big prize entrance) provided on the game board 20, the main control unit 200 instructs the payout control unit 230 to issue a prize ball. Request signal (
A prize ball payout command) is output, and in accordance with this, a prize ball is paid out under the control of the payout control unit 230. Further, when the player operates the lending button 5e, a lending payout request signal for instructing lending payout is output from the CR unit 13 to the payout control unit 230 based on the operation, and a payout is made accordingly. The payout of the rental ball is performed under the control of the control unit 230.

The launch control unit 250 constitutes launch control means for controlling the launch of a game ball on the game board. The launch control board 250a includes a launch motor (not shown), a touch switch 8a, a launch stop switch 8b, and the like. It is connected.

The sub-control unit 260 constitutes sub-control means for controlling various effects executed as the game progresses. The sub-control board 260a includes a CPU 260b, a ROM (not shown), a RAM, and a RAM.
Arithmetic circuit components having a sound source IC (sound generator), a sound source ROM, an input / output port and the like are provided, and are connected to the main control unit 200 at the input / output port. The CPU 260b of the sub-control unit 260 is configured to control the sound source IC based on a control command transmitted from the main control unit 200, and the sound source IC uses specific sound data from sound data stored in the sound source ROM. Is read and reproduced. Audio data (audio signal) reproduced by the sound source IC is output from the speakers 10a to 10d. The sub-control unit 260 is configured to control effect control using decoration display by various lamps, symbol display by the effect display device 25, and the like in addition to the reproduction of sound effects output from the speakers 10a to 10d.

An effect display control unit 280 is connected to the sub control unit 260. Production display control board 2
Arithmetic circuit components (not shown) having a CPU 280b, a RAM, a ROM, an input / output port, a VDP (video display processor), etc. are provided at 80a, and are connected to the sub-control board 260a at the input / output port. The effect display control unit 280 includes the effect display device 2
5 is connected. The effect display control unit 280 is configured such that the CPU 280b performs display control of the effect display device 25 using the RAM as a work area according to a control program stored in the ROM.

Various LEDs and lamps 262 are connected to the sub-control board 260a via a decorative drive board 261. The various LEDs / lamps 262 are for enhancing the gaming effect, and these lamps are turned on / off or blinking in accordance with the progress of the game to enhance the gaming effect. The sub-control unit 260 has an amplifier board 263 provided with an amplifier circuit 300 described later.
Is connected. Speakers 10a to 10d are connected to the amplifier substrate 263,
The audio signal from the sub-control unit 260 is amplified and output to the speakers 10a to 10d. From the speakers 10a to 10d, various sounds, sounds, and the like are output in accordance with the progress of the game. Further, the effect button 5 d is connected to the sub-control unit 260 via the effect button board 264. The sub-control unit 260 and the amplifier circuit 300 correspond to the “voice control unit” of the present invention.

FIG. 3 is a circuit diagram showing the relationship between the amplifier circuit 300 provided on the amplifier substrate 263 and the speakers 10a to 10d. The amplifier circuit 300 and the upper speakers 10a and 10b are provided on the middle frame 3 side, and the lower speakers 10c and 10d are provided on the outer frame 2 side. The amplifier circuit 300 and the upper speakers 10a and 10b are connected by wiring, and are configured to be electrically connected even when the front frame 4 and the middle frame 3 are opened. On the other hand, the amplifier circuit 300 and the lower speakers 10c and 10d are connected by wiring through the connector 301. When the middle frame 4 is opened with respect to the outer frame 2, the connector 301 is separated, The electrical connection between the amplifier circuit 300 and the lower speakers 10c and 10d is released. The connector 301 includes an inner frame side connector 301a and an outer frame side connector 301b. The wiring on the amplifier circuit 300 side is connected to the middle frame side connector 301a, and the wiring on the lower speaker 10c, 10d side is connected to the outer frame side connector 301b.

4 is a perspective view of the connector 301, and FIG. 5 is a perspective view of the gaming machine 1 showing the state in which the middle frame 3 is opened with respect to the outer frame 2 as seen from the back side. In this embodiment, a drawer connector is used as the connector 301. As shown in FIG. 4, in this embodiment, the middle frame side connector 301 is used.
Is configured as a male connector, and the outer frame connector 301b is configured as a female connector.

As shown in FIG. 5, the middle frame side connector 301a (male side connector) is provided on the middle frame 3 side, and the outer frame side connector 301b (female side connector) is provided on the outer frame 2 side. Then, by opening the middle frame 3 with respect to the outer frame 2, the middle frame side connector 301a and the outer frame side connector 301 are provided.
b is separated (the electrical connection between the amplifier circuit 300 and the lower speakers 10c and 10d is released (disconnected)), and the middle frame 3 is closed with respect to the outer frame 2, so that The frame side connector 301b is connected (the amplifier circuit 300 and the lower speaker 10).
c and 10d are electrically connected).

In the gaming machine 1, when a trouble such as a ball clogging occurs during the game, the middle frame 3 is opened with the power turned on to perform maintenance of the tank rail and the like. For example, the frame 3 is closed and the game is continued. When the drawer connector 301 is used as in this embodiment, the middle frame 3 is opened when the middle frame 3 is opened, so that the middle frame 3 is opened when the power is turned on. In this case, back electromotive force (back electromotive voltage) may be generated at the contact point of the middle frame side connector 301a. For this reason, when the middle frame 3 is opened and the middle frame side connector 301a and the outer frame side connector 301b are separated in a state where a large volume of sound is being output from the lower speakers 10c and 10d, the output from the amplifier circuit 300 is output. There is a risk of losing a place to the speaker side, causing an overcurrent to flow back to the amplifier circuit 300 and damaging electronic components such as the amplifier circuit 300 and the sub-control unit 260.

Therefore, in this embodiment, as shown in FIG. 3, the amplifier circuit 300 and the middle frame side connector 30 are provided.
Protection circuits 302 and 303 are provided between 1a and 1a. The protection circuits 302 and 303 are RC circuits in which resistors and capacitors are connected in series, and the protection circuits 302 and 303 are connected in parallel to the speakers 10c and 10d. As a result, when the middle frame 3 is opened and the middle frame side connector 301a and the outer frame side connector 301b are separated during operation of the gaming machine (especially during sound output), the back of the middle frame side connector 301a is caused to reverse. When a voltage is generated, the current generated by the counter electromotive voltage flows to the protection circuits 302 and 303. In the protection circuits 302 and 303,
The back electromotive force is consumed as heat energy, and a rapid voltage rise can be suppressed. As a result, even when the middle frame 3 is opened and the middle frame side connector 301a and the outer frame side connector 301b are separated in a state where a large volume is output from the lower speakers 10c and 10d, the middle frame side connector 301a. Thus, it is possible to prevent the current due to the back electromotive voltage generated at the contact point from flowing through the amplifier circuit 300 and protect the amplifier circuit 300 and the sub-control unit 260.

FIG. 6 shows the relationship between the frequency and impedance of the lower speakers 10c and 10d and the protection circuits 302 and 303. As shown in FIG. 6, the lower speakers 10c and 10d have a characteristic that the impedance increases as the frequency of the audio signal increases. On the other hand, the protection circuits 302 and 303 have a characteristic that the impedance decreases as the frequency of the audio signal increases. The frequency band (1) of the audio signal normally output from the amplifier circuit 300 as the game progresses
(00 Hz to 10000 Hz), the impedance of the lower speakers 10 c and 10 d is smaller than the impedance of the protection circuits 302 and 303. For this reason, in the frequency band (100 Hz to 10000 Hz) of the audio signal used in the gaming machine of this embodiment (the sound in the band outside this frequency band is usually inaudible to humans), the current from the amplifier circuit 300 is , The current flows mainly to the lower speakers 10c and 10d instead of the protection circuits 302 and 303. Thereby, when the designed audio signal is output, the audio output loss of the audio signal can be reduced as much as possible, and high-quality audio output can be maintained. At this time, the protection circuit 3
Although the current related to the audio signal also flows on the 02 and 303 sides, the amount of current flowing to the protection circuit side can be reduced as much as possible by making the impedance on the protection circuit side sufficiently higher than the impedance on the lower speaker side.

Further, when the impedance of the amplifier circuit 300 is lower than the impedance of the protection circuits 302 and 303, a current due to the counter electromotive voltage generated at the contact of the middle frame side connector 301a when the middle frame 4 is opened may flow to the amplifier circuit 300. is there. On the other hand, the counter electromotive voltage is likely to be generated at a high frequency. In this embodiment, the protection circuits 302 and 303 have a characteristic that the impedance decreases as the frequency of the audio signal increases. The impedance of the protection circuit when an electromotive voltage is generated can be made sufficiently lower than the impedance of the amplifier circuit. For this reason, when the middle frame 3 is opened and the middle frame side connector 301a and the outer frame side connector 301b are separated, a current due to the back electromotive voltage generated at the contact of the middle frame side connector 301a flows to the protection circuits 302 and 303. Thereby, it is possible to prevent a current due to the back electromotive voltage generated at the contact of the middle frame side connector 301a from flowing to the amplifier circuit 300, and to protect the amplifier circuit 300 and the sub-control unit 260.

The protection circuits 302 and 303 have lower impedance as the frequency of the audio signal is higher, and lower than the impedance of the lower speakers 10c and 10d in a high frequency band (approximately 40000 Hz or higher). For this reason, in the high frequency band, the protection circuits 302 and 303 are mainly used.
Current will flow through. As a result, high-frequency sound (noise) is generated from the protection circuits 302 and 303.
The high-frequency noise can be removed by the protection circuits 302 and 303.

(Other embodiments)
As mentioned above, although the Example of this invention was described, this invention is not limited to this,
As long as it does not deviate from the scope described in each claim, it is not limited to the wording of each claim, the scope is easily replaced by those skilled in the art, and improvements based on the knowledge that those skilled in the art normally have are made as appropriate. Can be added.

For example, in the above embodiment, the protection circuits 302 and 303 include R and resistors and capacitors.
Although the C circuit is used, the present invention is not limited to this configuration. The protection circuit has a characteristic that the impedance decreases as the frequency of the audio signal increases, and the frequency band (100 Hz) of audio normally used in the gaming machine 1 is used. It is only necessary that the impedance of the lower speakers 10c and 10d is smaller than the impedance of the protection circuits 302 and 303 at 10000 Hz. In the present embodiment, the frequency band (10000 exceeding the frequency band (100 Hz to 10000 Hz).
(Hz or higher), the impedance of the protection circuits 302 and 303 is lower than the impedance of the amplifier circuit 300 and the sub-control unit 260.

DESCRIPTION OF SYMBOLS 1 ... Game machine, 2 ... Outer frame, 3 ... Middle frame, 10a, 10b ... Upper speaker, 10c, 10d ...
Lower speaker, 260 ... sub-control unit, 300 ... amplifier circuit, 301 ... connector, 302,
303: protection circuit.

Claims (1)

Speakers,
An audio control unit for outputting an audio signal to the speaker;
A first connector electrically connected to the voice control unit; and a second connector electrically connected to the speaker, wherein the first connector and the second connector can be electrically separated and connected. A drawer connector,
A protection circuit provided between the voice control unit and the first connector,
The protection circuit is configured such that in the frequency band of the audio signal output from the audio control unit as the game progresses, the impedance decreases as the frequency of the audio signal increases, and from the impedance of the speaker A gaming machine, wherein the protection circuit has a higher impedance.

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