JPH0249752B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fraud prevention device in a gaming machine, and more specifically, in an electrical gaming machine that operates based on an electrical control signal, a noise generating means is used to prevent fraud. The present invention relates to a fraud prevention device in a gaming machine that prevents illegal gaming in which an electrical gaming device is operated illegally.

[Conventional technology] In recent years, with the development of electronic technology, in order to control games in various gaming machines including game machines.
Electronic circuits including ICs, LSIs, microprocessors, etc. are used. Based on electrical control signals output from such electronic circuits, an electrical gaming device provided in the gaming machine is operated to play a game. Gaming machines including such electrical gaming devices include pinball gaming machines such as pachinko gaming machines or coin gaming machines that hit pachinko balls, video gaming machines installed in game centers or coffee shops, and other game centers. Various game machines installed in places such as
There was one described in Publication No. 116376. Here, the electrical gaming device includes a variable display member that is electrically driven, a winning ball device that is electrically driven based on the gaming state, and the like.

By the way, in various gaming machines including the above-mentioned electrical gaming devices, when electromagnetic waves such as high-frequency noise or low-frequency pulse-like noise are applied, they malfunction in response to the noise signal.
There are cases where the device operates when it is not supposed to or operates in a manner different from the original operation. For example, in a pachinko game machine equipped with a variable display member or an electric winning ball device, a glass door frame is provided to be openable and closable in order to hold a glass plate that covers the front surface of the game board. This glass door frame and a metal frame surrounding the glass door frame are formed of a conductor or a conductive member.

However, recently, pachinko gaming machines that include variable display members display variable display members in a variable manner or create winning ball devices even though the conditions that originally require the variable display member to display the variable display members are not met. Malfunctions such as opening the winning ball device even though it was not a condition occurred frequently. When the cause was investigated, it was discovered that an unscrupulous player was repeatedly firing the electronic lighter while holding it close to the metal frame. That is, an electronic lighter includes a piezoelectric element as an ignition means, and is ignited by applying a high frequency voltage to the piezoelectric element, and generates high frequency noise when ignited. and,
The high-frequency noise generated by the electronic lighter is transmitted through the glass door frame or metal frame as an antenna and is transmitted to various electrical and electronic devices installed in the pachinko game machine, and these devices are triggered by the high-frequency noise. An electric control signal may be output by mistake, and the electric control signal may cause a variable display member to display a variable display or open a winning ball device, for example. Note that the device that causes the game machine to operate illegally is not limited to the electronic lighter, but may also include a commercially available radio wave oscillator. This kind of illegal gaming is
It is also used in coin gaming machines. Therefore, in pinball game machines and slot machines such as pachinko and coin game machines, it is necessary to prevent fraudulent games by using equipment that generates fraudulent electromagnetic waves such as the above-mentioned high frequency noise and pulsed low frequency noise. There is.

Moreover, these illegal games using illegal electromagnetic waves are often carried out not only on pinball game machines but also on video game machines installed in game centers. In other words, a video game machine allows one game in response to the insertion of a certain amount of coins, but it is possible to illegally generate electromagnetic waves by placing a device that generates illegal electromagnetic waves, such as an electronic lighter, near the coin slot. When this happens, the built-in electrical and electronic devices malfunction in the same way as when coins are detected due to the noise of illegal electromagnetic waves, resulting in fraudulent games being played for free.

As a means to solve such problems,
There was a technique described in Japanese Patent No. 54-136084. In this conventional technology, when a noise signal of illegal electromagnetic waves is caught, the power to the gaming machine is immediately shut off, games are disabled, and illegal gaming is prevented. In addition to turning the gaming machine back on, it also displayed a message to confirm that the illegal electromagnetic waves had been captured.

[Problems to be Solved by the Invention] On the other hand, some of the electromagnetic waves generated in game parlors are completely incidental and have no purpose for illegal gaming, such as noise caused by static electricity on clothing. Therefore, when noise caused by electromagnetic waves is caught, it is necessary to notify the staff at the game hall as soon as possible and prompt the staff at the game hall to respond flexibly to the situation, taking into account the cause of the generated noise signal. be. In particular, when a noise signal associated with electromagnetic waves is caught, certain types of gaming operations are automatically disabled to automatically and quickly prevent fraudulent gaming, and the occurrence of the noise signal. In the unlikely event that the cause was not for the purpose of illegal gaming, consideration should be given to ensuring that the game machine is quickly released from the inoperable state through the judgment of the game hall staff and flexible response to ensure that the player does not lose out. There is a need to.

However, in the conventional illegal gaming prevention technology, a timer displays a confirmation that a noise signal has been caught after a predetermined period of time has elapsed.
Due to the delay in notification to the game hall staff, the game hall staff's response will be delayed, and if the cause of the noise is not for the purpose of illegal gaming, it will cause discomfort to the players. There were flaws. Moreover, in the conventional technology, if noise caused by electromagnetic waves is caught, the power to the gaming machine is automatically cut off.
A gaming machine that has been powered off will not return to its original state until a predetermined period of time has elapsed based on a timer, and from this point of view, it is difficult for the staff at the gaming facility to restore the machine on a case-by-case basis. However, if the cause of the noise signal was not for the purpose of illegal gaming, there was a risk that the player would feel uncomfortable.

The present invention was devised in view of the above circumstances, and its purpose is to automatically disable certain types of operations of gaming machines as a countermeasure when noise signals that may indicate fraudulent gaming are detected. The aim is to prevent the player from feeling uncomfortable in the event that the cause of the noise is not a fraudulent game, while also being able to prevent fraudulent gaming as quickly as possible by activating the system.

[Means for Solving the Problems] The present invention provides a gaming machine including an electrical gaming device that operates based on an electrical control signal, which prevents fraudulent gaming in which the electrical gaming device is operated illegally using a noise generating means. A fraud prevention device for a gaming machine, the detection means being provided in association with a conductive member included in the gaming machine and detecting that a noise signal generated from the noise generating means is applied to the conductive member. , a fraud detection means for detecting that a fraudulent game has occurred in response to the detection of the noise signal by the detection means; a state holding means for storing and retaining a fraud detection state in accordance with the output of the fraud detection means; manual operation. reset means for canceling the noise signal detection state of the state holding means, and disabling a certain type of operation of the gaming machine based on the fact that the state holding means stores and holds the noise signal detection state; The present invention is characterized by comprising a game disabling means for activating the game.

[Function] In the present invention, by the function of the detection means, it is detected that the noise signal generated from the noise generation means is applied to the conductive member included in the gaming machine, and in response to the detection, the detection of illegal gaming is detected. This is detected by the fraud detection means. The noise signal detection state is stored and held by the state holding means in accordance with the output of the fraud detection means. moreover,
Due to the action of the game disabling means, a certain type of operation of the gaming machine is disabled based on the fact that the state holding means memorizes and holds the noise signal detecting means, and then the reset means is manually operated. As a result, the noise signal detection state of the state holding means is released.

In other words, if noise that may indicate fraudulent gaming is detected, a certain type of operation of the gaming machine will be disabled, and fraudulent gaming can be quickly prevented as much as possible. It is possible to manually cancel the noise based on the judgment of the staff at the game parlor, and in the event that the cause of the noise is not for the purpose of illegal gaming, the staff can flexibly perform the cancellation operation.

[Embodiments of the Invention] Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1A is a front view of a pachinko game machine as an example of a game machine to which the present invention is applied, and FIG. 1B is a perspective view showing the relationship between the metal frame and the locking mechanism.

In FIG. 1A, a pachinko machine 10, which is an example of a pinball game machine, is constructed by rotatably mounting a front frame 11 on a frame member (not shown) of an installation island of the pachinko machine. A game board 12 is attached to the front frame 11. As is conventionally known, the game board 12 is formed with a safe hole 12a, a variable display member 12b, a variable winning ball device 12c, a winning ball device (so-called tulip) 12d, and the like. The variable display member 12b or the variable winning ball device 12c constitutes an electric gaming device that operates based on an electric control signal. A glass door frame 14 equipped with a glass plate 13 is attached to the front surface of the game board 12 so as to be openable and closable. Below the glass door frame 14, a front plate 15 is provided.
is attached so that it can be opened and closed freely. A prize ball discharge port 15a and a batted ball waiting gutter 15b are formed on the front plate 15. The batted ball waiting gutter 15b serves as a ball tray for temporarily storing balls borrowed by players from the ball rental machine and prize balls released from the prize ball release port 15a.
The stored balls are lined up one by one to the terminal end and guided to a ball supply device (not shown).
A metal frame 16 is formed on the front frame 11 around the glass door frame 14 and the front plate 15. A locking mechanism 17 is provided on the back of one side of the front frame 11 in the vertical direction. Here, the glass door frame 14, the metal frame 16, and the locking mechanism 17 are each made of a metallic material, that is, a conductive member that easily transmits electric signals. In other words, in this embodiment, the glass door frame 14, the metal frame 16, and the locking mechanism 17 are used as the conductive members included in the gaming machine.

Note that if a large amount of prize balls are stored in the ball waiting gutter 15b and staying on the back side of the game board, the pachinko balls become a conductive member, so the ball waiting gutter 15b
In some cases, illegal games are played by bringing an electronic lighter, which is an example of high-frequency oscillation means, close to the prize balls stored in the game machine. In this case, a metal plate in contact with the prize balls may be provided on the back side of the game board, and this metal plate and the prize balls may be used as conductive members.

Further, below the front frame 11, a ball hitting handle 19 included in the electric ball hitting mechanism is provided. Although not shown, the electric ball hitting mechanism further includes a ball hitting motor, a ball hitting cam, a ball hitting hammer, a ball hitting switch, and a single hitting switch 36b.

In FIG. 1B, a high frequency signal detection antenna 18a, which is an example of a detection means, is electrically connected to the metal frame 16. Furthermore, a high frequency signal detection antenna 18b, which is an example of a detection means, is connected to the locking mechanism 17. More specifically, the antennas 18a, 18
Terminal 1 is connected to the tip of the antenna wire 181, respectively.
82, and the terminal 182 is attached to the metal frame 1 with the screw 183.
6. Each is connected to the washer 17a of the locking mechanism 17. The hook 17b of the locking mechanism 17 is provided to be slidable vertically relative to the washer 17a, and a hook-shaped portion of the hook 17b engages with an engaging portion (not shown) provided on the installation island. This locks the front frame 11. That is, in this example,
The antenna 18 is attached to the glass door frame 14, the metal frame 16, and the locking mechanism 17 by taking advantage of the fact that they are made of metal and can easily transmit electrical signals such as noise.
By electrically connecting the terminals 182 of a and 18b, it is possible to detect that high frequency noise is intentionally applied to the metal frame 16. The antenna wire 181 of these antennas 18a and 18b is
The signal is applied to a fraud detection/prevention circuit 30 shown in FIG. 3, which will be described later.

FIG. 2 is an illustrative view of an island formed by installing a plurality of pachinko machines to which the present invention is applied.
In the figure, one island includes island platforms 21a and 21b.
are provided in two rows. On each island stand 21a, 21b, a plurality of pachinko machines 10 are arranged in parallel, back to back. The balls of each pachinko machine 10 are dropped downward through the ball recovery path. In the lower part between the island stands 21a and 21b,
A collection gutter 22 is provided from one side of the island to the other side (rightward in the figure). A lift 23 is provided at the end of the collecting gutter 22 for lifting the balls collected by the collecting gutter 22. The balls lifted by the lift 23 are temporarily stored in a storage tank 24. A replenishment gutter 25 for supplying replenishment balls is provided below the temporary storage tank 24 along the length of the island. Supply gutter 25 at the top of each pachinko machine 10
A tributary gutter 26 is formed therein. The supply balls diverted by the tributary gutter 26 are supplied to the prize ball tank of the corresponding pachinko machine 10 when a supply control shutter 27, which is an example of a supply means, is opened. This replenishment control shutter 27 is opened when the prize balls stored in the prize ball tank of the corresponding pachinko machine 10 becomes less than a certain amount, and is closed when the predetermined amount of replenishment is completed, and the stop control is performed. Even if the number of balls in the prize ball tank falls below a predetermined amount, it will not open.

By the way, a fraud detection/prevention circuit 30 is provided in relation to the plurality of pachinko machines 10. The fraud detection output of each pachinko machine is given to a fraud display panel 28, which is an example of a display means provided on one side of the island. The unauthorized display panel 28 is displayed on each pachinko machine 10.
The machine number of the corresponding pachinko machine is drawn in relation to each display part (e.g., a light emitting diode or a light bulb). When the fraud detection/prevention circuit 30 of a certain Pachinko machine detects a fraudulent game, the display section corresponding to the machine number of the Pachinko machine lights up. Further, on one side of the island, a fraud alarm light 29 is provided to notify that fraud has occurred on any platform on the island. In addition to or in place of the fraud alarm light 29, a buzzer, a bell, a chime, a speaker, or the like, which is an example of an audio alarm means for issuing an audio alarm, may be provided. Note that the buzzer may be provided for each pachinko machine.

FIG. 3 shows a block diagram of one embodiment of the present invention, particularly showing the fraud detection/prevention circuit 30 and notification means. In the figure, the fraud detection/prevention circuit 30 includes antennas 18a and 18b, a fraud detection circuit 31 as an example of fraud detection means, a latch circuit 32 as an example of state holding means, a reset switch 33, a power supply circuit 34,
It includes an AC power supply 35, a ball hitting motor drive circuit 36, and a buzzer 37, which is an example of a sound alarm means that generates an alarm with a sound, which is another example of an alarm means. In addition, latch circuit 3
The fraud detection output No. 2 is given to the fraud display panel 28.

In addition, if there are multiple islands in the gaming area,
More preferably, when a fraud detection output of any machine number is received on the fraud display panel of each island, the fraud detection output is sent to the fraud display panel 38 for each island, which is an example of a display means provided at a location away from the island. Given. The display panel 38 includes a display portion corresponding to each island, and the island number of the corresponding island is depicted on the panel. In this way, there is an advantage that the staff can easily know about fraud by monitoring the fraud display panel 38 from a remote location without having to constantly monitor the inside of the gaming hall. The fraud display panels 28, 38 or the buzzer 37 constitute a notification means for notifying that a fraud has occurred based on the fact that a state holding means, which will be described later, stores and holds a fraud detection state.

Next, the operation of this embodiment will be explained with reference to FIGS. 1A to 3. The player opens the glass door frame 14
Alternatively, when the electronic lighter is ignited (or ignited) with the electronic lighter brought close to the front surface of the metal frame 16 or the locking mechanism 17, high-frequency noise is generated from the electronic lighter. This high frequency noise is transmitted to the antenna 18a through the metal frame 16 and the like, and is detected by the antenna 18a. Note that the noise generating means may be a commercially available radio wave oscillator, and electromagnetic waves such as radio waves oscillated from the radio wave oscillator and high frequency noise oscillated from the electronic lighter are detected by the antenna 18a. High frequency noise and the like detected by the antenna 18a are provided to the fraud detection circuit 31. The fraud detection circuit 31 derives a high level signal indicating that a fraudulent game has occurred in response to input such as high frequency noise for a certain period of time and supplies it to the latch circuit 32. More preferably, in order to prevent power supply noise or one-off noise from being erroneously detected as fraudulent gaming,
1 may be configured to detect illegal games in response to high frequency noise of a frequency component in a slightly wider band than the oscillation frequency band of an electronic lighter which operates using a piezoelectric element.

A constant voltage is constantly supplied to the latch circuit 32 from a constant voltage power supply circuit 34 via a reset switch 33. This latch circuit 32 includes a self-holding relay, and when the output of the fraud detection circuit 31 is applied, it closes its normally open contact to form a closed circuit between the AC power source 35 and the buzzer 37, and opens its normally closed contact. The power supply to the ball hitting motor drive circuit 36 is then stopped. For this purpose, the normally closed contacts of the self-holding relay included in the latch circuit 32, the AC power supply 35, and the ball-striking motor drive circuit 36 are connected in series. The ball hitting motor drive circuit 36 is comprised of a series circuit including a starting switch 36a, a single hitting switch 36b, and a ball hitting motor 36c. The ball-striking switch 36a is closed when pressed by the player when the player wishes to perform a ball-striking operation, and supplies power to the ball-striking motor 36c. 19 or when the player touches the ball hitting handle 19. The single hit switch 36b is a normally closed switch that cuts off the power supply when pressed when the player wants to play a single hit. Therefore, a series circuit of the normally closed contact of the self-holding relay included in the ball hitting motor drive circuit 36 and the latch circuit 32 and the AC power supply 35 constitutes a hitting prohibition means, which is an example of the game disabling activation means. It turns out. When the latch circuit 32 maintains the fraud detection state, the buzzer 37 sounds to notify that fraud has occurred. Further, the output of the normally open contact of the self-holding relay included in the latch circuit 32 is given to the fraud display panel 28 as a fraud detection state holding signal. Note that the indicator light of the fraud display panel may be provided for each pachinko machine. Then, the display section corresponding to the fraudulent pachinko machine is displayed.

By the way, the staff member who notices the possibility of fraudulent gaming may look at the display status of each display section of the fraudulent display panel 28 and determine which pachinko machine the player is playing with may be playing fraudulently. First, determine whether the player is actually playing illegally or whether the noise signal was accidentally emitted due to static electricity on clothing, etc., and if the player is actually playing illegally, identify the problem. Take measures such as warning the player or forcing him or her to stop playing. Thereafter, the staff member presses the reset switch 33 to release power from the constant voltage power supply circuit 34 to the latch circuit 32, thereby restoring the self-holding relay included in the latch circuit 32. In this way, the latch circuit 32
After releasing the illegal game detection state, the buzzer 37 stops sounding, power is supplied to the ball hitting motor 36c, and the ball hitting operation can be performed again. The reset switch 33 constitutes a reset means that releases the fraud detection state of the state holding means by manual operation.

Next, the fraud detection circuit 31 and the latch circuit 32
Also, details of the constant voltage power supply circuit 34 will be explained.

FIG. 4 is a detailed circuit diagram of the fraud detection circuit 31, the latch circuit 32, and the constant voltage power supply circuit 34.
In the configuration, the fraud detection circuit 31 is an IC (type name
NE555) Includes 31a, IC31a and resistor 31b
and a time constant circuit consisting of a capacitor 31c constitute a one-shot circuit. The time constant of this time constant circuit is determined based on the fraudulent game detection output period from which a pulse signal is to be derived when a fraudulent game is detected. A constant voltage is supplied from a constant voltage circuit 34 to one end of the IC 31a and the resistor 31b.
A series circuit of a variable resistor 31d and a capacitor 31e is inserted between the static voltage line output from the constant voltage circuit 34 and the ground line. capacitor 3
A diode 31f is connected in parallel to 1e.
The antennas 18a and 18b are connected to the input end of the IC 31a and the cathode end of the diode 31f. The output terminal of IC31a is the latch circuit 32
It is grounded through a coil 32a of a self-holding relay included in the self-holding relay. A backflow prevention diode 32c is connected in parallel to the coil 32a. A series circuit of a normally open contact 32b and a reset switch 33 is connected between the output end of the IC 31a and the positive voltage line of the constant voltage power supply 34, which is closed by the energization of the relay coil 32a. Self-holding relay coil 3
The normally open contact 32d of 2a is inserted into a closed circuit between the AC power source 35 and the buzzer. The detailed circuit diagram shown in FIG. 4 shows only the circuit for sounding the buzzer when an illegal game is detected, but the circuit is configured to disable the game as in the embodiment shown in FIG. 3. Needless to say, it's a good thing.

In operation, the constant voltage power supply circuit 34 generates a constant voltage, supplies power to the IC 31a, and
The capacitor 31e is constantly charged to a constant voltage. In this state, the terminal voltage of the capacitor 31e, that is, a positive voltage is applied to the input terminal of the IC 31a. However, when the antenna 18a or 18b detects high frequency noise based on the oscillation operation of the electronic lighter, a negative pulse is transmitted to the IC31.
Connection point 31g between input terminal a and capacitor 31e
given to. The high frequency noise applied to the antenna 18a is such a minute current that it cannot trigger the IC 31a by itself. However, when the electronic lighter is operated to ignite, the oscillation operation is repeated, so that the charge in the capacitor 31e is gradually discharged via the antenna 18a, the metal frame 16, etc. due to the negative oscillation pulse. Therefore, a negative trigger pulse is applied to the input terminal of the IC 31a. Accordingly, I.C.
31a is the resistance value of resistor 31b and capacitor 31c
A high level signal is derived for a certain period of time based on a time constant determined by the capacitance of , and the coil 32a of the self-holding relay is energized. Accordingly, normally open contact 32b
is closed, and the output voltage of the constant voltage power supply circuit 34 is continuously supplied to the relay 32a for self-holding.
Therefore, the normally open contact 32b of the self-holding relay is closed continuously, and the output of the AC power supply 35 is supplied to the buzzer 37, causing the buzzer to sound.

If the staff member notices an illegal game, he or she goes to the illegal game machine, issues a warning to the player, and takes steps such as discontinuing the game, and then presses the reset switch 33. Incidentally, if the generation of the noise signal is not due to the purpose of illegal gaming due to static electricity on clothing, etc., the reset switch 33 is pressed without issuing a warning to the player. In response, the coil 32a of the self-holding relay is demagnetized so that the normally open contact 32b is opened. As a result, the contact point 32d based on the detection of illegal gaming
The self-holding state of is released and the buzzer 37 stops ringing.

In addition, in the above-mentioned embodiment, as an example of the game disabling means for disabling the game based on the detection output of illegal games, the case where the ball hitting operation is prohibited was explained, but as another example of the game disabling means For example, the game machine may be disabled by a replenishment inhibiting means that closes the shutter 27 shown in FIG. It may be activated.

Further, in the above-described embodiment, a pachinko machine was described as an example of a gaming machine, but the technical idea of the present invention is not limited to this and can be applied to various other gaming machines. For example, when applied to a video game device using a CRT display, an antenna 18a is attached to a metal plate provided in a coin slot.
18b and CRT according to the illegal game detection output.
The configuration may be such that the power supply to the circuit that controls the display is cut off.

[Effects of the Invention] The present invention has the above-described configuration, and when a noise signal that may indicate fraudulent gaming is detected, it is possible to disable certain types of operations of the gaming machine and promptly prevent fraudulent gaming as much as possible. Moreover, the memory of the noise signal detection state can be manually cleared based on the judgment of the game hall staff, so that the staff can flexibly adjust the noise signal detection state in the event that the cause of the noise is not due to illegal gaming. The release operation has made it possible to reduce the player's discomfort as much as possible.

[Brief explanation of drawings]

FIGS. 1A and 1B are illustrative views of a pachinko game machine, which is an example of a game machine to which the present invention is applied.
FIG. 2 is an illustrative diagram of an island constructed by installing a plurality of pachinko gaming machines. FIG. 3 is a block diagram of a fraud detection/prevention device 30 according to an embodiment of the present invention. FIG. 4 is a detailed circuit diagram of the fraud detection circuit 31, the latch circuit 32, and the constant voltage power supply circuit 34. In the figure, 10 is a pachinko machine as an example of a gaming machine, 14 is a glass door frame, 16 is a metal frame, 18a, 1
8b is an antenna which is an example of a detection means, 30 is a fraud detection/prevention circuit, 31 is a fraud detection circuit which is an example of a fraud detection means, 32 is a latch circuit which is an example of a state holding means, 34 is a constant voltage circuit, and 35 is an AC power supply. , 36 is a ball hitting motor drive circuit, 37 is a buzzer which is an example of a notification means, and 28 and 38 are fraud display panels which are an example of a notification means.

Claims (1)

[Scope of Claims] 1. In a gaming machine including an electrical gaming device that operates based on an electrical control signal, a method for preventing fraudulent gaming in which the electrical gaming device is operated illegally using a noise generating means. A prevention device comprising: a detection means provided in association with a conductive member included in the gaming machine and configured to detect that a noise signal generated from the noise generating means is applied to the conductive member; a fraud detecting means for detecting that a fraudulent game has occurred in response to the detection of a noise signal; a state holding means for storing and retaining a fraud detection state in response to the output of the fraud detecting means; and maintaining the state by manual operation. a reset means for canceling the noise signal detection state of the means; and a game disable activation for disabling a certain type of operation of the gaming machine based on the fact that the state holding means stores and holds the noise signal detection state. A fraud prevention device in a gaming machine, which is equipped with means. 2. The game machine is a pinball game machine that includes a game board and a ball hitting means for hitting balls onto the game board, and the game disable activation means is a ball hitting prohibition means that prohibits the ball hitting operation by the ball hitting means. , A fraud prevention device for a gaming machine according to claim 1. 3. The gaming machine is a pachinko gaming machine that includes a gaming board on which a winning area is formed and a prize ball discharging means that pays out prize balls according to the winning balls that enter the winning area, and the pachinko gaming machine includes: A replenishing means for replenishing balls to the prize ball discharging means is provided in conjunction, and the game disabling means is a replenishment prohibiting means for prohibiting the replenishing means from replenishing balls. Anti-fraud device for gaming machines. 4. The gaming machine is a gaming machine that can play a game that changes a display based on electrical drive according to predetermined conditions, and the gaming disabling means is a gaming machine that can play a game that changes a display based on electrical drive according to a predetermined condition; A fraud prevention device in a gaming machine according to claim 2, which is a blocking means.