JP2009285418A - Fraudulent act monitoring system for game machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To always monitor a fraudulent act for a game machine and identify fraudulent modification of a main board without increase in costs. <P>SOLUTION: An optical communication channel-monitoring loop that starts from a monitor device through a plurality of game machine main boards 20 and returns to the monitor device is formed of an optical cable. The cable and the main boards are connected so that the optical connection channel is blocked when a fraudulent act is committed on the main board. The main board includes: an optical communication subscriber line network device (ONU) 5 capable of conducting bidirectional optical communication for sending/receiving optical signals to and from the monitor device; a first splitter 3a for splitting the optical communication channel from one direction of the bidirectional optical communication channel into the channel to the ONU and to those to other game machines; a second splitter 3b for relaying the channel from a reverse direction; and a first and second optical signal monitoring circuits M1 and M2 connected with the first and the second splitters via the channel, respectively, both monitoring circuits sensing whether or not the channel is blocked in one/reverse directions. The main board fraudulently modified is identified by sensing blocking of the bidirectional optical communication channel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an unauthorized monitoring system for gaming machines such as pachinko machines or slot machines, and more particularly to a system for monitoring unauthorized modification of a main board of a gaming machine using optical communication.

  The authenticity of the gaming machine is inspected by an inspector who visits a pachinko parlor. However, in the near future, it will be possible to inspect gaming machines not only from the field but also from a remote location such as an inspection organization using communication. In the case of unauthorized modification of a gaming machine, especially unauthorized modification of the main board, a modification is performed in which an unauthorized device hidden under another place is controlled by impersonating a regular microcomputer on the main board. If it is broken, it is difficult to check the unauthorized modification of the inspection device, and there are some methods other than the discovery of the part added visually. In order to prevent an illegal act by a device pretending to be a regular product, there is a method of eliminating the opportunity to make unauthorized modifications to the gaming machine by always monitoring by monitoring between the monitoring device and the gaming machine. However, in order to perform constant monitoring, it is assumed that the power of the monitoring device and the gaming machine is on, and communication is performed when the gaming machine is turned off after the pachinko store is closed, that is, when the power is off. Cannot be performed and monitoring cannot be performed. This is because when communication is disabled, it cannot be determined whether the gaming machine is simply turned off or whether the main board of the gaming machine has been removed and remodeling has been performed. In addition, when this method is adopted, there are problems from the viewpoint of energy saving in the pachinko parlor, where the gaming machines placed in a narrow space shine even after the end of business. Even if a separate power supply for monitoring is provided and the gaming machine main body is turned off, the problem of energy saving is solved, but it is expected that the wiring of the power supply and the circuit in the gaming machine will be complicated. The

  According to the prior art, communication between the main board of a gaming machine and another board is performed by optical communication, thereby preventing bit corruption due to noise intrusion or illegal acts due to connection of hanging boards (Patent Literature). 1). In addition, a system for monitoring gaming machine fraud using optical communication, in which a circuit housing box containing the main electronic circuit of the gaming machine is wrapped with a monitoring optical fiber and sealed, There is also a system that detects whether or not a gaming machine is turned on and off by detecting the state of an optical signal of the monitoring optical fiber with a control circuit, and monitoring the gaming machine for fraud (Patent Document 2). Furthermore, a monitoring current loop driven by a DC power supply or backup power supply different from the master power supply is provided between the main board and other boards in the gaming machine, and the current in the current loop is monitored and stored in the storage unit. In some cases, the stored current state is read when the master power source is turned on to detect the disconnection of the monitoring current loop when the power source is turned off, thereby detecting the presence or absence of unauthorized modification to the main board or the like (Patent Document 3). .

JP 2004-41297 A JP 2007-222579 A JP 2007-236498 A

  According to the prior art, unauthorized modification of a main board or the like in each gaming machine is monitored using a current loop or an optical communication path loop. In addition, illegal monitoring of individual gaming machines with the power off is performed using a current loop. Therefore, according to the prior art, illegal modification to the main board of all pachinko machines in the pachinko parlor is always monitored at once by using optical communication, and the power supply of the pachinko parlor is not only during the business but also after the business is closed. It is not possible to detect the presence or absence of fraud even in the state of dropping. In addition, the illegally modified main board cannot be specified. Monitoring is also performed at the signal level in the optical communication path loop. Therefore, when the monitoring function is stopped by some work, a bypass of the optical communication path is made and the gaming machine may be modified.

  The object of the present invention is to solve such problems in the prior art and constantly monitor all the gaming machines of the pachinko store using optical communication, so that the power of the gaming machine is turned on as well as the power source. This is to prevent unauthorized modification of the main board or the like of the gaming machine even in a state where the game has fallen.

  According to a first aspect of the present invention, in a gaming machine fraud monitoring system, a plurality of gaming machines each having a main board, a monitoring device for monitoring unauthorized modification of each main board of the gaming machine, and the plurality of gaming machines An optical cable that connects each main board of the gaming machine and the monitoring device so as to form an optical communication path loop, and the optical cable is moved in an unauthorized manner with respect to each main board. The monitoring device has means capable of bidirectional optical communication with the gaming machine powered off, so that the plurality of the optical cables are connected to the plurality of the optical cables. A fraud monitoring system characterized by forming a monitoring loop by optical communication that passes through each main board of the gaming machine and returning to the monitoring device, and monitoring whether or not the main board is tampered with when the gaming machine is turned off. Temu is provided.

  According to one feature of the first aspect of the present invention, the means capable of two-way optical communication of the monitoring device comprises an optical communication network control device and an optical communication terminal device, and originates from one of these devices. The received optical signal may be received by the other device via the monitoring loop.

  According to another characteristic of the first aspect of the present invention, each main board of the gaming machine includes an optical communication terminal device for transmitting and receiving optical signals to and from the monitoring device, and an optical communication path through the optical communication terminal device. And an optical branching device that branches into an optical communication path to the main board of another gaming machine.

  According to still another feature of the first aspect of the present invention, a concentrated terminal board connected to each main board of the gaming machine for collecting data of the main board and the data of the concentrated terminal board are tabulated. It is preferable that the main board, the concentrated terminal board, and the hall computer are connected to each other via an optical communication path.

  According to a second aspect of the present invention, in a gaming machine fraud monitoring system, a plurality of gaming machines each having a main board, a monitoring device for monitoring unauthorized modification of each main board of the gaming machine, An optical cable that connects each main board of the gaming machine and the monitoring device so as to form an optical communication path loop, and the optical cable is moved in an unauthorized manner with respect to each main board. The monitoring device has means capable of bidirectional optical communication with the gaming machine powered off, so that the plurality of the optical cables are connected to the plurality of the optical cables. A monitoring loop is formed by optical communication that passes through each main board of the gaming machine and returns to the monitoring device, and each main board of the plurality of gaming machines monitors whether or not the optical communication path is interrupted when the gaming machine is powered off. It has an optical signal monitoring circuit, whereby the fraud monitoring system and identifies the main board which is tamper during gaming machine power is off is provided.

  According to one feature of the second aspect of the present invention, the means capable of bidirectional optical communication of the monitoring device comprises an optical communication network control device and an optical communication terminal device. The received optical signal may be received by the other device via the monitoring loop.

  According to another feature of the second aspect of the present invention, each main board of the gaming machine includes an optical communication terminal device capable of bidirectional optical communication with the monitoring device for transmitting and receiving optical signals, and bidirectional light. A first optical branching device that branches an optical communication path from one direction of the communication path into an optical communication path to the optical communication terminal device and an optical communication path to the main board of another game machine; A second optical branching device that relays the optical communication path, wherein the optical signal monitoring circuit is connected to the first and second optical branching devices via the optical communication path in one direction and in the opposite direction, respectively. You may comprise the 1st and 2nd optical signal monitoring circuit which detects the presence or absence of interruption | blocking of an optical communication path.

  According to still another feature of the second aspect of the present invention, the first and second optical signal monitoring circuits detect the interruption of the optical communication path in one direction and the reverse direction when the gaming machine power is off. It is preferable that a sensor that holds the state is included, and the held state is reported to the monitoring device via the optical communication terminal device when the gaming machine is turned on.

  According to still another feature of the second aspect of the present invention, the sensor for detecting the interruption of the optical communication path includes a light receiving element that receives an optical signal of the optical communication path and converts it into an electrical signal, An N-gate thyristor controlled by an output signal; a capacitor that is discharged and charged by turning on and off the N-gate thyristor; and a voltage detector that detects a charge / discharge state of the capacitor by detecting a voltage across the capacitor. It may be made.

  According to still another feature of the second aspect of the present invention, a concentrated terminal board connected to each main board of the gaming machine for collecting the data of the main board, and the data of the concentrated terminal board are tabulated. It is preferable that the main board, the concentrated terminal board, and the hall computer are connected to each other via an optical communication path.

  According to the present invention, it is preferable to arrange the monitoring device in the hall computer so that the hall computer can always manage not only the control information of each gaming machine but also information related to fraud.

  According to the present invention, the connection structure between the optical cable and the main board of the gaming machine is such that a slightly larger hole is formed in the outer shape of the optical connector with respect to the main board, and the optical cable is passed therethrough, thereby providing an optical communication path for the optical cable. The main substrate may not be taken out unless it is blocked.

  According to the present invention, the connection structure between the optical cable and the main board of the gaming machine is such that the optical cable is connected from above and below the case by the optical connector having a flange larger than the hole formed in the case of the main board. The structure may be such that the case cannot be opened unless the communication path is blocked.

  According to the present invention, the connection structure between the optical cable and the main board of the gaming machine is such that the optical cable is connected from above and below the case by the optical connector having a flange larger than the hole formed in the case of the main board. A structure in which the main board is relayed and connected via the upper and lower connectors of the board may be used.

  According to the present invention, the connection structure between the optical cable and the main board of the gaming machine is such that the optical cable is attached to the board fixture via the optical connector without a latch and the board fixture has a fulcrum of operation. Accordingly, the optical communication path of the optical cable may be blocked by the operation of the board fixing tool when the main board is attached or detached.

  According to the present invention, since an abnormality in the optical communication path can be detected even when the gaming machine is powered off, it is possible to constantly monitor the gaming machine for fraud regardless of the gaming machine power status. When remodeling or replacing a board, it is necessary to separate the optical communication path from the board, but it is difficult to make a bypass for the optical communication path compared to a metal cable. You will be temporarily disconnected. For this reason, the monitoring device can recognize that there is an abnormality in the optical communication path, and it is possible to discover the modification or replacement of the board by checking the gaming machine. In addition, by providing an optical branch device on the main board or the like inside the gaming machine, the optical communication path branched by the optical branching device from the loop of the optical communication path is not exposed to the outside of the gaming machine. This makes it difficult to avoid the loop part and perform fraud on the branch optical communication path. Furthermore, since the cut part of the optical communication path can be confirmed, it is easy to identify a gaming machine suspected of unauthorized modification. Since optical communication is used, it is possible to perform accurate data communication without mixing noise, and it is difficult to make a bypass of the optical communication path, so that it is possible to prevent an illegal act due to the connection of the hanging board. Further, since the main board of the illegally modified gaming machine can be specified, it is not necessary to detect and confirm the illegally modified gaming machine by silent. Furthermore, by connecting the fraud monitoring system of the present invention to the hall computer directly or indirectly through a central terminal board through an optical communication path, the hall computer collects not only control information of all gaming machines but also information on fraud. Therefore, it can be applied to inspection requests from remote locations by future inspection organizations. Further, since not only data communication from gaming machines but also unauthorized monitoring of gaming machines can be achieved using a common optical communication path, no extra cost or space is required.

  Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are diagrams illustrating a communication system of optical communication, and FIGS. 2A and 2B are diagrams illustrating a monitoring device and a main board of a gaming machine that constitute a fraud monitoring system of the present invention. 3 is a diagram showing a configuration of a fraud monitoring system of the present invention using optical communication.

  For optical communication, the SS system that performs one-to-one communication between the monitoring device 1 and the three gaming machines 2 as shown in FIG. 1A, or the optical communication path is branched by the splitter 3 in the middle as shown in FIG. 1B. There is a PDS system that performs one-to-many communication. In the PDS system, for example, an optical subscriber line terminating device (Optical Line Terminal: hereinafter referred to as “OLT”) and an optical subscriber line network device (Optical Network Unit: hereinafter referred to as “ONU”) are monitored. 1 and the gaming machine 2 can be arranged respectively for optical communication. However, in either method, if the gaming machine 2 is turned off, communication is not established and the problem cannot be solved. In the embodiment of the present invention, “OLT”, “ONU”, and “splitter” constitute “optical communication network control device”, “optical communication terminal device”, and “optical branching device” of the present invention, respectively. .

  Therefore, the OLT 4 and the ONU 5 are arranged in the monitoring device 1 and the gaming machine 2 (substantially the main board of the gaming machine, hereinafter referred to as “gaming machine 2”) as shown in FIGS. 2A and 2B. The monitoring device 1 and each gaming machine 2 are connected by an optical cable 6 as shown in FIG. In addition to the OLT 4 and the ONU 5, a control circuit 7 that controls these devices is provided in the monitoring device 1, and optical connectors A and B are provided on the gaming machine side of the monitoring device 1, respectively.

  In addition to the ONU 5, the gaming machine 2 is provided with a splitter 3 for branching the optical communication path and a main chip 8 that controls other elements including the ONU 5. In addition, connectors A and B for performing optical communication connection with the monitoring device 1 or another gaming machine 2 are provided at both ends of the gaming machine 2, respectively. In FIG. 2A, FIG. 2B, and FIG. 3, a thick line arrow represents an optical communication path, and a thin line arrow represents an electrical signal path.

  As shown in FIG. 3, the optical communication path is connected between the plurality of gaming machines 2 and the monitoring apparatus 1 by connecting the optical connector A and the optical connector B of the monitoring apparatus 1 and the gaming machine 2 with the optical cable 6. A loop is formed. That is, the OLT 4 in the monitoring device 1 communicates with the ONU 5 in the same monitoring device 1 via the optical communication path loop, so that even if the gaming machine is powered off, the optical communication path It becomes possible to grasp the disconnection etc. The optical cable 6 is connected to each gaming machine (main board) 2 so that the optical communication path of the optical cable 6 is blocked when each main board is moved illegally. Specific examples of this connection structure are shown in FIGS. 8 to 11 and will be described later.

  Next, the operation of the fraud monitoring system in FIG. 3 will be described. In the monitoring system of FIG. 3, the monitoring device 1 is configured to perform bidirectional optical communication between the OLT 4 and the ONU 5 in the monitoring device 1 regardless of the power state of the gaming machine 2. That is, the OLT 4 of the monitoring device 1 tries to communicate with the ONU 5 in the gaming machine 2 and the ONU 5 in the monitoring device 1 in a short cycle regardless of the power state of the gaming machine. When the gaming machine 2 is powered on, communication between the monitoring device 1 and each gaming machine 2 is established, so by sending the ID of the main chip mounted on the gaming machine 2 and other data to the monitoring device 1, The authenticity of the gaming machine 2 becomes possible. In addition, when the gaming machine 2 is powered off, communication with each gaming machine 2 cannot be performed, but between the OLT 4 and the ONU 5 in the monitoring device 1 through the optical cable 6 connected to each gaming machine. Communication is possible. Therefore, if communication is performed between the OLT 4 and the ONU 5 in the monitoring device 1, communication cannot be performed if the optical communication path is removed even at one place due to unauthorized modification of the gaming machine 2. It can be confirmed that an abnormality has occurred.

  4 and 5 show the configuration of an optical signal monitoring circuit and a gaming machine (substantially its main board) used in another embodiment of the fraud monitoring system of the present invention. In the embodiment of the fraud monitoring system, the gaming machine 20 in FIG. 5 is replaced with the gaming machine 2 in FIGS. 2B and 3. In the gaming machine 20 of FIG. 5, two splitters 3 a and 3 b are provided instead of the splitter 3 of the gaming machine 2. Further, two optical signal monitoring circuits M1 and M2 that are not included in the gaming machine 2 are provided. Each of these optical signal monitoring circuits M1 and M2 has a configuration as shown in FIG. 4, and is connected to two splitters 3a and 3b through optical communication paths, respectively. Moreover, it connects with ONU5 by the electrical signal path | route. In FIGS. 4 and 5, as in FIGS. 2A, 2 </ b> B, and 3, thick line arrows represent optical communication paths, and thin line arrows represent electrical signal paths.

  The optical signal monitoring circuits M1 and M2 in FIG. 4 are provided with capacitor charge / discharge circuits. As shown in the figure, this charging / discharging circuit includes a capacitor C1 and a drive circuit 41 including a power supply E and a transistor TR. Further, an N-gate thyristor SCR is provided in parallel with the capacitor C1, and the capacitor C1 is discharged by the switching operation of the N-gate thyristor SCR. Further, a light receiving element 42 for converting the optical signals from the splitters 3a and 3b into electrical signals is provided. The output of the light receiving element 42 is connected to the gate terminal of the N gate thyristor SCR. Switching control of the N gate thyristor SCR is performed. A voltage detector 43 for detecting the voltage across the capacitor C1 is also provided.

  Next, the operation of the optical signal monitoring circuits M1 and M2 of FIG. 4 and the gaming machine 20 of FIG. 5 incorporating the circuit will be described. If the light is input to the optical signal monitoring circuits M1 and M2 in FIG. 4, since the N-gate thyristor SCR is off, the charge stored in the capacitor C1 is retained. However, if the optical communication path is disconnected and no light is input even once, the N-gate thyristor SCR continues to be turned on until the charge of the capacitor C1 is exhausted. Therefore, when the power source of the gaming machine 20 is started up, the voltage detector 43 detects the state of the capacitor C1, and notifies the monitoring device 1 via the ONU 5. As a result, as shown in FIG. 6, the monitoring device 1 can grasp at which part the abnormality has occurred. After the communication with the monitoring device 1 is completed, the capacitor C1 is charged by the drive circuit 41.

  Next, with reference to FIGS. 6, 7A, 7B, and 7C, how to identify the disconnection portion of the optical communication path will be described. 7A, 7B and 7C show the state of the capacitor C1 in each of the optical signal monitoring circuits M1 and M2 of the four gaming machines 1 to 4 connected as shown in FIG. When there is no disconnection of the communication path, FIG. 7B is when the disconnection of the optical communication path is one place (disconnection α), and FIG. 7C is when the disconnection of the optical communication path is two places (disconnections α, β) or more. The state of the capacitor C1 is shown. The optical signal monitoring circuits M1 and M2 detect disconnection on the left and right sides of the gaming machine in FIG. 6, respectively, in other words, in FIG. 6, M1 detects disconnection of the optical communication path in the B → A direction and M2 detects A. → Detects disconnection of the optical communication path in the B direction. Therefore, it is possible to identify the disconnection points α and β by detecting the disconnection of the optical communication path from both directions.

  As described above, in this embodiment of the fraud monitoring system, when the gaming machine is powered on by adding the optical signal monitoring circuit of FIG. 4 to the gaming machine as shown in M1 and M2 of FIG. It is possible to specify the location where the optical communication path is disconnected.

  In the embodiment of the fraud monitoring system described above, it is configured to discharge the capacitor in the optical signal monitoring circuit when there is an abnormality in the optical communication path, but instead of such a configuration, a backup of the main chip By discharging the capacitor used in, it is possible to destroy backup data and notify that there was an abnormality.

  Further, the fraud monitoring system of the present invention may be connected to the hall computer directly or indirectly via an optical communication path via a central terminal board connected to each main board of the gaming machine. Further, the monitoring device of the present invention may be arranged in the hall computer. By arranging the monitoring device in the hall computer in this way, the hall computer can manage not only the control information of all the gaming machines but also the information on the illegality of the gaming machines all at once using a common optical communication path. It is fully applicable to requests for inspections from remote locations by other inspection organizations.

  If the main board is taken out of the case, it is more difficult to modify it if the structure is such that this optical communication path cannot be removed. Hereinafter, this structure will be described with reference to FIGS.

  FIG. 8 shows an optical communication path of the optical cable 84 by making a slightly larger hole 83 in the outer shape of the optical connector 82 in the component 81 that is a problem to be taken out, that is, the printed circuit board 81 as the main board, and passing the optical cable 84 therethrough. It shows the structure that can not be taken out without blocking.

  FIG. 9 shows an optical connector 92 having a flange 96 larger than the hole formed in the case 95. By connecting from the upper and lower sides of the case 95, the case can be opened without blocking the optical communication path of the optical cable 94. It shows the structure that disappears.

  FIG. 10 shows a structure that is mechanically the same as that of FIG. 9 and in which the optical cable 104 is connected to the printed circuit board 101 via the upper and lower connectors 107 on the printed circuit board 101 side. This structure is useful when an optical signal has to be taken into the substrate, such as a substrate on which the ONU of the monitoring device is mounted.

  FIG. 11 shows a structure in which the optical cable 114 is attached to the board fixture 118 via the optical connector 112 without a latch, and the board fixture 118 is attached to the printed board 111. By making the board fixture 118 to have a fulcrum C as shown in the figure, the end of the board fixture 118 is always pushed in the directions of arrows A and A ′ when the printed board is mounted or removed. As a result, the optical communication path of the optical cable 114 is blocked. That is, the optical connector 112 moves in the directions of arrows B and B ′.

It is a figure which shows the optical communication system by SS system. It is a figure which shows the optical communication system by a PDS system. It is a block diagram of the monitoring apparatus in the fraud monitoring system by one Embodiment of this invention. It is a lineblock diagram of a game machine in a fraud monitoring system by one embodiment of the present invention. 1 is a configuration diagram of a fraud monitoring system according to an embodiment of the present invention. FIG. It is a circuit diagram of the optical signal monitoring circuit used for the gaming machine in the fraud monitoring system according to another embodiment of the present invention. It is a block diagram of the gaming machine in the fraud monitoring system according to another embodiment of the present invention. FIG. 4 is a configuration diagram similar to FIG. 3 for explaining that a disconnection portion of an optical communication path is specified in a fraud monitoring system according to another embodiment of the present invention. FIG. 7 is a diagram illustrating a state of a capacitor in the optical signal monitoring circuit of FIG. 4 when there is no disconnection in the optical communication path of FIG. 6. FIG. 7 is a diagram illustrating a state of a capacitor in the optical signal monitoring circuit of FIG. 4 when there is one disconnection in the optical communication path of FIG. 6. FIG. 7 is a diagram illustrating a state of a capacitor in the optical signal monitoring circuit of FIG. 4 when there are two disconnections in the optical communication path of FIG. 6. It is a figure which shows an example of the connection structure of the main board | substrate of an amusement machine, and an optical cable. It is a figure which shows another example of the connection structure of the main board | substrate of an amusement machine, and an optical cable. It is a figure which shows another example of the connection structure of the main board | substrate of an amusement machine, and an optical cable. It is a figure which shows another example of the connection structure of the main board | substrate of an amusement machine, and an optical cable.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Monitoring apparatus 2 20 Game machine 3, 3a, 3b Splitter 4 Optical subscriber line termination | terminus apparatus (OLT)
5 Optical subscriber line network equipment (ONU)
6 Optical cable 7 Control circuit 8 Main chip A, B Optical connector M1, M2 Optical signal monitoring circuit E Power supply TR Transistor SCR N gate thyristor C1 Capacitor 41 Drive circuit 42 Light receiving element 43 Voltage detector 81, 91, 101, 111 Printed circuit board 82 , 92, 102, 107, 112 Optical connector 83 Hole 84, 94, 104, 114 Optical cable 95, 105 Case 96 Flange 118 Substrate fixture

Claims (10)

In the fraud monitoring system for gaming machines,
A plurality of gaming machines each having a main board;
A monitoring device for monitoring unauthorized modification of each main board of the gaming machine;
An optical cable that connects each main board of the plurality of gaming machines and the monitoring device so as to form an optical communication path loop;
The optical cable is connected to each main board so that when each main board is improperly moved, the optical communication path of the optical cable is blocked,
The monitoring device has means capable of two-way optical communication when the gaming machine is powered off, thereby returning optical communication from the monitoring device to the monitoring device through the main boards of the plurality of gaming machines. A fraud monitoring system characterized in that a monitoring loop is formed to monitor whether or not the main board has been tampered with when the gaming machine is powered off.   Means capable of bidirectional optical communication of the monitoring device includes an optical communication network control device and an optical communication terminal device. An optical signal transmitted from one of these devices is transmitted to the other device via the monitoring loop. The fraud monitoring system according to claim 1, wherein the fraud monitoring system is configured to receive.   Each main board of the gaming machine includes an optical communication terminal device for transmitting and receiving optical signals to and from the monitoring device, an optical communication path to the optical communication path to the optical communication terminal apparatus, and a main board of another gaming machine. The fraud monitoring system according to claim 2, comprising an optical branching device that branches into an optical communication path.   The main board, connected to each main board of the gaming machine, for collecting data of the main board, and a hall computer for collecting and managing the data of the concentrated terminal board, the main board, The fraud monitoring system according to any one of claims 1 to 3, wherein the central terminal board and the hall computer are connected to each other via an optical communication path. In the fraud monitoring system for gaming machines,
A plurality of gaming machines each having a main board;
A monitoring device for monitoring unauthorized modification of each main board of the gaming machine;
An optical cable connecting each main board of the plurality of gaming machines and the monitoring device so as to form an optical communication path loop;
The optical cable is connected to each main board so that the optical communication path of the optical cable is blocked when each main board is moved illegally,
The monitoring device has means capable of two-way optical communication when the gaming machine is turned off, so that the optical communication returns from the monitoring device to the monitoring device through each main board of the plurality of gaming machines. Form a monitoring loop with
Each main board of the plurality of gaming machines has an optical signal monitoring circuit for monitoring whether or not the optical communication path is interrupted when the gaming machine power is turned off. A fraud monitoring system characterized by identification.   Means capable of bidirectional optical communication of the monitoring device includes an optical communication network control device and an optical communication terminal device. An optical signal transmitted from one of these devices is transmitted to the other device via the monitoring loop. The fraud monitoring system according to claim 5, wherein the fraud monitoring system is configured to receive. Each main board of the gaming machine includes an optical communication terminal device capable of bidirectional optical communication for transmitting and receiving optical signals to and from the monitoring device, and an optical communication path from one direction of the bidirectional optical communication path. It consists of a first optical branching device that branches into an optical communication path to the device and an optical communication path to the main board of another gaming machine, and a second optical branching device that relays the optical communication path from the opposite direction. ,
The optical signal monitoring circuit detects the presence or absence of interruption of the optical communication path in one direction and the reverse direction connected to the first and second optical branching devices via an optical communication path, respectively. The fraud monitoring system according to claim 6, comprising an optical signal monitoring circuit.   The first and second optical signal monitoring circuits are composed of sensors that detect the interruption of the optical communication path in one direction and in the opposite direction when the gaming machine power is turned off, and hold the state. The fraud monitoring system according to claim 7, wherein the fraud monitoring system is reported to the monitoring device via the optical communication terminal device when a power supply is turned on.   The sensor for detecting the interruption of the optical communication path includes a light receiving element that receives an optical signal of the optical communication path and converts it into an electrical signal, an N gate thyristor controlled by an output signal of the light receiving element, and an ON state of the N gate thyristor 9. The fraud monitoring system according to claim 8, further comprising: a capacitor that is discharged and charged when turned off; and a voltage detector that detects a charge / discharge state of the capacitor by detecting a voltage across the capacitor.   The main board, connected to each main board of the gaming machine, for collecting data of the main board, and a hall computer for collecting and managing the data of the concentrated terminal board, the main board, The fraud monitoring system according to any one of claims 5 to 9, wherein the central terminal board and the hall computer are connected to each other through an optical communication path.

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