JP4629384B2 - Game machine - Google Patents

Description

  The present invention relates to a gaming machine such as a slot machine, and more particularly to a gaming machine capable of preventing an illegal act that causes a medal detection sensor to malfunction.

In a gaming machine such as a slot machine, it is determined whether the inserted medal is a regular size (diameter) medal and whether a regular medal is correctly inserted or not Some have a medal selector (medal sorting device) that can be detected and counted by two medal detection sensors on the downstream side (see, for example, Patent Documents 1 and 2).
JP 2002-248210 A JP 2002-336416 A

  The medal detection sensors in the medal selector described in the above-mentioned patent documents are all light-shielding photosensors (infrared sensors) composed of a projector (part) and a light receiver (part), and are directed from the projector to the light receiver. When the medal blocks the optical axis of the irradiated light, the passage of the inserted medal is detected and counted.

  Therefore, when an infrared emitting device or the like is inserted from the medal insertion slot to the vicinity of the medal detection sensor inside the medal selector and the infrared ray is emitted toward the light receiver, the medal detection sensor malfunctions and the medal is actually There is a risk that a fraudulent act of making a virtual medal insertion state similar to the one inserted may occur. When such an illegal act is performed, the game hall suffers a great damage because it can be in a pseudo credit state as if many medals were actually inserted and stored.

  In order to prevent this, it may be possible to shift the mounting positions of the upstream and downstream medal detection sensors so that they do not match the light emitting position of the infrared emitting device. The design must be changed, such as changing the sheath and shape, resulting in high costs.

  Further, the shape of the infrared emitting device may be changed for a new medal selector, and there is a risk that fraud will be performed again.

According to the present invention, the above problem is solved as follows.
(1) to guide the medal inserted from the medal insertion slot in Tokomu medal passage within the housing, providing a medal detection sensor consisting of a transmitter and receiver, by the medal detection sensor, the passage of the entered medals In response to a plurality of pulse signals having different duty ratios, the control board that controls each device of the gaming machine and receives a light reception signal that is a detection signal of the medal detection sensor and the projector The pulse pattern control means capable of changing the light emission pattern of the pulse signal and whether or not the light emission pattern emitted by the projector matches the light reception pattern received by the light receiver . and a pulse pattern detecting means for detecting said pulse pattern detecting means, and said light receiving pattern and the light emitting pattern When detecting the致, the inputted received signal to the control board, by the light receiving signal is temporarily turned off, pass Medals been detected, before Symbol medals officially turned from the medal insertion slot Can be identified.

According to the present invention, the above problem is solved as follows.
(1) A medal detection sensor composed of a projector and a light receiver is provided in a medal passage that guides a medal inserted from a medal slot and takes it into the housing, and the inserted medal is directed from the projector to the light receiver. In a gaming machine that detects the passage of medals by blocking the emitted optical axis, the projector emits light with a pulse signal, and the light emission pattern of the pulse signal is changed by a pulse pattern control means. Make it possible.

  (2) In the above item (1), the pulse pattern control means includes a pulse width modulator for changing the pulse width in the light emission pattern.

  (3) In the above item (1) or (2), the pulse pattern control means includes a pulse interval modulator that changes the pulse interval in the light emission pattern.

  (4) In the above item (1), the pulse pattern control means is a pulse pattern memory in which pulse patterns having different pulse widths or pulse intervals in the light emission pattern or both are stored.

  (5) In the above item (4), the pulse pattern memory stores a plurality of different pulse patterns in advance.

According to the present invention, the following effects can be achieved.
According to the first aspect of the present invention, since the light emission pattern for causing the projector of the medal detection sensor to emit light by the pulse signal can be changed by the pulse pattern control means, an infrared emitting device or the like is inserted from the medal slot. Even if a malfunction occurs in the medal detection sensor, it is difficult to emit infrared rays in synchronization with the light emission pattern of the projector, so a virtual medal insertion state similar to that in which a medal is actually inserted is set. There is no fear of cheating.

  According to the second aspect of the invention, since the pulse width of the light emission pattern is changed by the pulse width modulator, it becomes difficult to emit infrared rays from an infrared emitting device or the like in synchronization with the pulse width. Is definitely prevented.

According to the invention of claim 3, since the interval between the pulses of the light emission pattern is changed by the pulse interval modulator, it becomes difficult to emit infrared rays from an infrared emitting device or the like in synchronization with the pulse interval. As with the above, fraudulent acts are reliably prevented.
In this case, if it is used in combination with the pulse modulator according to claim 2, it becomes even more difficult to perform fraud.

  According to the fourth aspect of the present invention, the pulse pattern having different pulse width or pulse interval or both can be read from the pulse pattern memory and the projector can be caused to emit light. It is difficult to emit more infrared rays, and fraudulent acts are reliably prevented as described above.

According to the invention of claim 5, since a plurality of different pulse patterns can be sequentially or randomly called from the pulse pattern memory to cause the projector to emit light,
It becomes more difficult to synchronize infrared rays emitted from an infrared emitting device or the like with the pulse pattern.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a gaming machine (slot machine) to which an embodiment of the present invention is applied. In the following description, the front side of the page in FIG. 1 is the front of the gaming machine, the back side of the page is the back side, the left side of the page is also the left side, and the right side of the page is the right side.

  The gaming machine (1) uses a disk-shaped medal (including coins) as a game medium, and inserts this medal, which will be described later, provided on the right side of the front door (2a) provided on the front surface of the housing (2). A predetermined game is played by putting it in the part (6). In the housing (2), the three rotating bodies (3a) having a plurality of kinds of symbols on the outer peripheral surface, the symbol display unit (3) incorporating the rotation motor, the index sensor, and the like are controlled. Control board, lighting device, acoustic device, and other devices are housed.

  In addition, on the front side of the front door (2a), a display window (2b) through which the symbol of the symbol display unit (3) can be seen from above, and a display lamp for displaying the winning line of the symbol display unit (3) ( 4) A display unit (5) for displaying the number of medals paid out, the number of credits, the number of bonuses, etc. at the time of winning when the symbols arranged on the winning line are in a predetermined combination, one medal A medal insertion part (6) that can be inserted into the housing (2) one by one, a switch operation part (7) in which various operation switches are arranged, a payout outlet (8) for payout medals and returned medals, and a payout outlet ( 8) A saucer (9) is provided for receiving medals coming out of 8).

  The switch operation unit (7) has an adjustment switch button (operated when adjusting a medal in a credit state (a state in which the number of medals inserted in the medal insertion unit (6) is electrically stored and stored in advance)). 10) One-insert switch button (11) operated when investing one credited medal into the game one by one, MAX bet switch button operated when investing the maximum number of three medals into the game (12), a start lever (13) operated when starting rotation of each rotating body (3a) in the symbol display unit (3), and a stop switch operated when stopping rotation of each rotating body (3a) A button (14), a settlement button (not shown), and the like are arranged.

  As shown in the block diagram of FIG. 8, the symbol display unit (3) is connected to a control board (C) including a central processing unit (CPU), and the rotation of the three rotating bodies (3a) is controlled. It is like that.

  In a gaming machine (1) such as a slot machine, a game is executed by taking a medal inserted into the medal insertion unit (6) into the gaming machine (1) to make a credit state, and a one-sheet insertion switch button (11) or MAX. The operation is started by operating the bet switch button (12) and operating the start lever (13).

  The medals inserted from the medal insertion unit (6) are sent to a medal selector (15), which will be described later, provided inside the housing (2) and arranged directly below the medal insertion unit (6). After authenticity and insertion are detected, it is sent to a medal payout hopper (not shown) arranged below the medal selector (15).

  As shown in the block diagram of FIG. 8, the medal payout hopper (H) is connected to the control board (C), and when winning a prize, the medal payout is performed by a payout sensor and a hopper motor (both not shown) in the medal payout hopper. The medals stored in the hopper are automatically paid out.

  After the medal is taken into the game machine (1), when the start lever (13) is operated, the three spinning bodies (3a) rotate all at once and the game is started. After a predetermined time has passed, the stop switch buttons (14) corresponding to the respective torso bodies (3a) are sequentially operated, and the rotation of each torso body (3a) is individually stopped, whereby the symbols arranged on the winning line are displayed. Depending on the combination, the number of medals distributed according to the presence / absence of a prize and the size of the prize is determined. When winning, medals are paid out from the payout exit (8) to the tray (9) by the medal payout hopper for the number of payouts.

  FIG. 2 shows a rear view of the lower half portion of the front door (2a). A medal selector (15) is provided below the medal insertion portion (6). As shown in detail in FIGS. 3 to 6, the medal selector (15) is made of a synthetic resin and is made of a synthetic resin disposed on the rear surface side thereof. The main part is an open / close guide plate (17), a metal movable guide plate (18), a solenoid (19) disposed on the front side of the selector base (16), and a medal passage direction detecting means (20). It is configured as.

  On the rear surface of the selector base (16), a vertical path (21a) communicating with the slot of the medal slot (6) described above and an arcuate curved path (21b) at the lower end of the vertical path (21a) are provided. 4 and FIG. 5, a medal comprising a slope (21 c) that gently slopes downward and communicates with a slit-like outlet hole (22) opened at the lower end of the right side plate (16 a) in FIGS. A passage (21) is formed. The width of the medal passage (21) is approximately equal to the diameter of the medal, and a plurality of ridges (23) are provided on the front surface thereof to reduce the passage resistance of the inserted medal and smoothly pass the medal. The projections are parallel to each other.

  The curved path (21b), the inclined path (21c), and the outlet hole (22) communicating with the side end of the inclined path (21c) are about 15 ° so that the upper part faces the rear with respect to the vertical plane. It is tilted backward (see FIGS. 5 and 6).

  This will be described in detail later, but when a medal (or coin) smaller than a regular medal is inserted, or when the gaming machine is not in operation, the inserted medal is laid down by its own weight and the medal passage ( 21) to discharge more.

  At the lower end of the rear surface of the selector base (16), there is a receiving plate (24) made of hard metal for supporting and rolling the lower end of the inserted medal, and the upper end surface thereof is a curved path (21b). It is fixed from the front side with a screw (25) so as to be aligned with the same surface as the lower end of the ramp (21c).

  The upper end of the open / close guide plate (17) is moved slightly to the side by a pin (27) on a pair of support pieces (26) and (26) protruding at the upper corner of the rear surface of the selector base (16). It is pivotally mounted and is always urged toward the selector base (16) by the torsion spring (28) so that the front surface of the lower end is in contact with the rear surface of the receiving plate (24).

  In the opening and closing guide plate (17) facing the lower part of the curved path (21b) and the inclined path (21c), a discharge port (29) for discharging the medal to the return duct (33), which will be described later, on its side Has a large opening.

  The rear surface facing the vertical path (21a) is closed by an open / close guide plate (17) so as to form a guide path (30) through which one medal can pass (see FIG. 5).

  As shown in FIG. 5, it is located between the lower end portion of the open / close guide plate (17), the opposed surfaces of the curved path (21b) and the lower end portion of the inclined path (21c) in the selector base (16), and between them. A guide groove (31) is formed by the upper end surface of the receiving plate (24) to guide the lower end of the medal in a freely rolling manner.

  A metal cover plate (32) having an inward L-shape in plan view is attached to the inner surface of the side piece (17a) connected to the lower part of the side end in the medal passage direction of the opening / closing guide plate (17). Yes. This cover plate (32) receives medals etc. that have fallen down from the outlet (29) and is put into a return duct (33) (see FIG. 2) provided directly below the medal selector (15). And return from the payout opening (8) to the tray (9).

  As shown in FIGS. 3 and 4, the upper end of the reject lever (35) is pivotable in the front-rear direction by a pin (36) on the support piece (34) protruding from the front upper part of the selector base (16). The rear-side pressing piece (35a) that is pivotally attached to the bottom of the selector base (16) is inserted through the opening (37) of the selector base (16) so that the rear surface can come into contact with the front surface of the open / close guide plate (17). It has become.

  As shown in FIG. 1, when the reject button (38) provided immediately below the medal insertion part (6) on the front face of the front door (2a) is pressed, the rear end is below the front side of the reject lever (35). The pressing piece (35a) protrudes from the opening (37) by abutting on the front surface of the facing piece (35b) and turning backward, and the opening / closing guide plate (17) is turned backward.

  As a result, the gap between the selector base (16) and the opening / closing guide plate (17) is greatly opened, and the medals and foreign matters jammed in the medal passage (21) are discharged to the return duct (33).

  As shown in the cross-sectional views of FIGS. 3, 4, and 7, the movable guide plate (18) described above is a guide piece that faces the upper end portion of the inclined path (21 c) on the rear surface side of the selector base (16). 18a), and an operating piece (18b) that is connected to the central portion and extends forward through the selector base (16), and also extends forward through the selector base (16). A pair of pivot pieces (18c) (18c), and the two pivot pieces (18c) are connected to a pair of support pieces (39) projecting forward of the selector base (16), and a torsion spring (40) Is pivotally attached to the pin (41) inserted through the guide pin (41) so that the guide piece (18a) is always urged in a direction away from the ramp (21c). Yes.

  A long hanging piece (42) is connected to the front end of the one (left) pivot piece (18c), and the rear projecting piece (42a) at its lower end penetrates the selector base (16). Thus, it always protrudes near the exit of the ramp (21c).

  This rearward projecting piece (42a) blocks the passage of the inserted medal (M) when the solenoid (19) is turned off, that is, when the game hall is being prepared and the gaming machine is not in operation. Thus, it is prevented from being sent to the medal payout hopper and forcibly inserted into the return duct (33).

  When the gaming machine is in an operating state, the solenoid (19) is turned on so that the medal can pass, the tilting plate (43) on the front side of the solenoid (19) is sucked, and the upper end push piece (43a) As shown in FIG. 7, the upright piece (18d) at the front end of the actuating piece (18b) in the movable guide plate (18) is pushed backward as shown in FIG.

  As a result, the guide piece (18a) at the lower end moves in a direction approaching the inclined path (21c), and the medal (M) is placed between the opposed surfaces of the lower end portion of the guide piece (18a) and the inclined path (21c). A guide groove is formed to guide the upper end of the guide. At the same time, the rearward projecting piece (42a) retracts forward from the ramp (21c), so that the inserted medal (M) can roll toward the payout hopper.

  When the solenoid (19) is turned off, the lower end portion of the tilting plate (43) is pulled by the return spring (44), and the pushing piece (43a) at the upper end portion moves forward, so that the movable guide plate (18 ) Is rotated backward about the pin (41), and the guide piece (18a) is rotated rearward and separated from the inclined path (21c), as indicated by a two-dot chain line in FIG.

  As a result, a guide groove that guides the upper end of the medal (M) is opened, and the medal (M) is laid down by its own weight while passing through the rearward inclined slope (21c) as shown by a two-dot chain line. It is discharged into the return duct (33).

  Even when the solenoid (19) is turned on, when a medal smaller than the diameter of the regular medal (M) is inserted, its upper end is not guided by the guide piece (18a). It is laid down and discharged into the return duct (33).

  As shown in FIGS. 3, 4, and 6, the medal passage direction detection means (20) is provided at the upper end and the lower portion of the downward piece (45 a) in the substrate (45) having an inverted L shape when viewed from the side. A transmission type first medal detection sensor (S1) comprising a light projector (46) whose light projection axis faces backward and a light receiver (47) whose light reception axis faces obliquely up and down; Two medal detection sensors (S2) are incorporated in two sets along the upstream side and the downstream side along the medal (M) passing direction.

A light emitting element such as an infrared light emitting diode is used for the projector (46), and a light receiving element such as a phototransistor is used for the light receiver (47).
A reflector (48) that refracts the optical axis from the light projector (46) toward the light receiver (47) is provided at the lower rear end of the rear piece (45b) of the substrate (45).

  The medal passage direction detection means (20) has a rear piece (45b) that passes through the selector base (16) and projects upward near the exit of the ramp (21c), and the light from the reflector (48). The shaft (49) is fixed to the front surface of the selector base (16) with a screw (50) so as to be blocked by its upper end when the inserted medal (M) passes.

  The first and second medal detection sensors (S1) and (S2) and the solenoid (19) described above are connected to the control board (C) shown in FIG. 8 by harnesses (51) and (52) shown in FIG. ing.

  (53) is a medal chute for guiding and inserting the medal (M) coming out from the outlet hole (22) of the medal passage (21) into the medal hopper.

  The projector (46) of the first and second medal detection sensors (S1) (S2) is connected to the pulse pattern control means (54) of any of the embodiments shown in the block diagrams of FIGS. In this way, light emission is performed with a light emission pattern controlled.

  That is, the pulse pattern control means (54) of the embodiment shown in FIG. 8 includes a pulse width modulator (55) and a pulse width variable signal transmitter (56) connected to the pulse width modulator (55) and transmitting a pulse width variable signal. The pulse width variable signal transmitter (56) is periodically input with a repetitive signal from the control board (C).

  When a control signal of a pulse is transmitted from the control board (C) to the pulse width modulator (55) via the pulse width variable signal transmitter (56), a pulse signal having a different duty ratio is transmitted to the projector (46). That is, for example, as shown in FIG. 9, a pulse signal in which the pulse width (light emission time) (t) changes into a plurality of patterns (for example, 4 patterns) with respect to the repetition time (T) (constant) is repeatedly transmitted at a constant cycle, The projector (46) emits light according to the light emission pattern.

When the light projector (46) emits light with the above pulse pattern and this light is received by the light receiver (47), a pulse pattern detection means (not shown), for example, synchronizes the phases of the light emission pattern and the light reception pattern. As shown in FIG. 9, when the pulse patterns of the projector (46) and the light receiver (47) completely match, a light reception signal is input to the control board (C) .

  When the inserted medal (M) blocks the optical axis emitting light with the above pulse pattern, the pulse signal of that portion does not reach the light receiver (47), so the first and second medal detection sensors (S1) ( S2) is turned off and it is detected that the medal (M) has passed. Further, the passing direction of the medal (M) is also detected at the same time according to the order in which both detection sensors (S1) and (S2) are turned on / off and the time.

As mentioned above, when the projector (46) emits light with a pulse signal with different duty ratios (pulse widths), an infrared emitter is inserted from the medal slot, and infrared rays are directed toward the light receiver (47). Even if it tries to malfunction the medal detection sensors (S1) (S2), it becomes difficult to emit infrared rays in synchronization with a plurality of different pulse widths in the light emission pattern , and the projector (46) and the receiver ( A mismatch occurs in the pulse pattern with 47) and an error signal is generated.
Therefore, there is no fear that an illegal act of making a virtual medal insertion state similar to that when a medal is actually inserted is performed.

  The pulse pattern control means (54) of the embodiment shown in FIG. 10 includes a pulse interval modulator (57), a pulse interval variable signal transmitter (58) connected to the pulse interval modulator (58) and transmitting a pulse interval variable signal. In this pulse interval variable signal transmitter (58), a repetitive signal is periodically input from the control board (C).

  When a control signal of a pulse is transmitted from the control board (C) to the pulse interval modulator (57) via the pulse interval variable signal transmitter (58), as shown in FIG. A pulse signal having a constant pulse width (light emission time) (t) and a pulse interval (T) changing to a plurality of patterns (for example, three patterns) is repeatedly transmitted at a constant period, and a projector (46 ) Emits light.

Similarly to the above, the light receiver (47) is configured to input a light reception signal to the control board (C) when the pulse pattern of the light projector (46) completely matches.
Accordingly, as described above, when the inserted medal (M) blocks the optical axis of the projector (46), the pulse signal of that portion does not reach the light receiver (47), so the first and second medal detection sensors (S1) and (S2) are turned off, and it is detected that the medal (M) has passed.

  In the pulse pattern control means (54) including the pulse interval modulator (57) as described above, since the pulse interval (T) changes, infrared rays are emitted in synchronization with different pulse intervals by an infrared emission device or the like. It is difficult to prevent fraud.

  The embodiment shown in FIG. 12 is an example in which the pulse pattern control means (54) is a pulse pattern memory (ROM) (59) provided on the control board (C).

  In the pulse pattern memory (59), for example, as shown in FIG. 13, a plurality of pulse patterns (1) to (n) are stored.

  As described above, each pulse pattern has a different pulse width duty ratio, a plurality of different pulse intervals, or a random change in pulse width and pulse interval. Created and stored in digital code.

The control board (C) reads such a plurality of pulse patterns in order or randomly, and the projector (46) emits light based on the pulse pattern, and the light receiver (47) receives the light reception signal in synchronization with this pattern. if so transmits a, as described above, by using an infrared firing device, it becomes difficult to emit infrared synchronized with the various pulse patterns, to malfunction of the medal detection sensor (S1) (S2) There is no fear of cheating.

  8 and 10, the pulse width variable signal transmitter (56) and the pulse interval variable signal transmitter (58) provided in the pulse pattern control means (54) are omitted. May be provided on the control board (C), and the variable signal may be directly transmitted from the control board (C) to the pulse width modulator (55) and the pulse interval modulator (57).

  Further, a pulse width modulator (55) and a pulse interval modulator (57) are provided in one pulse pattern control means (54), thereby forming a pulse pattern having a different pulse width and pulse interval, The projector (46) may emit light according to the light emission pattern.

  The pulse pattern memory (59) of the above embodiment is a ROM that stores a plurality of types of pulse patterns in advance, but a ROM that stores one type of pulse pattern in which the pulse width and / or the pulse interval are appropriately changed. May be used.

  Further, instead of the ROM as described above, a RAM or the like that stores an appropriate pulse pattern output by a random number generator or the like may be used.

  In the above embodiment, two medal detection sensors for detecting the passage of the medal (M) are provided, but there may be one.

It is a front view of a gaming machine to which the present invention is applied. Similarly, it is a rear view of the principal part of the front door. It is a disassembled perspective view of a medal selector provided with a medal detection sensor. Similarly, it is a rear view of the medal selector with the medal chute attached. It is the VV line vertical side view of FIG. Similarly, it is a VI-VI line longitudinal section side view. Similarly, it is a VII-VII line vertical side view. Similarly, it is a block diagram of the principal part for game machine control provided with the pulse pattern control means of 1st Embodiment. It is a figure which shows the light emission pattern and light reception pattern which are obtained by the pulse pattern control means of FIG. It is a block diagram of the principal part for game machine control provided with the pulse pattern control means of 2nd Embodiment. It is a figure which shows the light emission pattern and light reception pattern which are obtained by the pulse pattern control means of FIG. It is a block diagram of the principal part for game machine control provided with the pulse pattern control means of 3rd Embodiment. It is an example of the pulse pattern memorize | stored in the pulse pattern memory of FIG.

Explanation of symbols

(1) Pachislot machines
(2) Body
(2a) Front door
(2b) Display window
(3) Symbol display unit
(3a) Revolver
(4) Indicator lamp
(5) Display
(6) Medal insertion part
(7) Switch operation part
(8) Payment exit
(9) saucer
(10) Checkout switch button
(11) Single switch button
(12) MAX bet switch button
(13) Start lever
(14) Stop switch button
(15) Medal selector
(16) Selector base
(17) Opening / closing guide plate
(18) Movable guide plate
(18a) Guide piece
(18b) Actuating piece
(18c) pivot piece
(18d) Standing piece
(19) Solenoid
(20) Medal passing direction detection means
(21) Medal passage
(21a) Vertical path
(21b) Curved road
(21c) Ramp
(22) Outlet hole
(23) Projections
(24) Support plate
(25) Screw
(26) Support piece
(27) Pin
(28) Torsion spring
(29) Discharge port
(30) Guideway
(31) Guide groove
(32) Cover plate
(33) Return duct
(34) Support piece
(35) Reject lever
(35a) Pressing piece
(35b) Downward strip
(36) Pin
(37) Opening
(38) Reject button
(39) Support piece
(40) Torsion spring
(41) Pin
(42) Drooping piece
(42a) Backward projecting piece
(43) Tilt plate
(43a) Backward piece
(44) Return spring
(45) Board
(45a) Downward piece
(45b) Backward piece
(46) Floodlight
(47) Receiver
(48) Reflector
(49) Optical axis
(50) Screw
(51) (52) Harness
(53) Medal Shoot
(54) Pulse pattern control means
(55) Pulse width modulator
(56) Signal transmitter for variable pulse width
(57) Pulse interval modulator
(58) Pulse interval variable signal transmitter
(59) Pulse pattern memory
(C) Control board
(H) Medal payout hopper
(M) Medal
(S1) First medal detection sensor
(S2) Second medal detection sensor

Claims (5)

The Tokomu medal passage in the housing to guide the inserted medal from medal insertion slot, provided a medal detection sensor consisting of a transmitter and receiver, by the medal detection sensor, detects the passing of the entered medals In gaming machines,
A control board that controls each device of the gaming machine and receives a light reception signal that is a detection signal of the medal detection sensor;
And controlling the projector to emit light according to a plurality of pulse signals having different duty ratios, and a pulse pattern control means capable of changing a light emission pattern of the pulse signal;
Pulse pattern detection means for detecting whether or not the light emission pattern emitted by the projector matches the light reception pattern received by the light receiver ,
When the pulse pattern detection means detects the coincidence between the light emission pattern and the light reception pattern, the light reception signal is input to the control board,
Wherein by receiving signal is temporarily turned off, pass Medals been detected, a game machine, characterized in that to enable identifying that the previous SL medal was formally charged from the medal insertion slot.
  The gaming machine according to claim 1, wherein the pulse pattern control means includes a pulse width modulator for changing a pulse width in the light emission pattern.   The gaming machine according to claim 1 or 2, wherein the pulse pattern control means includes a pulse interval modulator that changes a pulse interval in the light emission pattern.   2. The gaming machine according to claim 1, wherein the pulse pattern control means is a pulse pattern memory in which pulse patterns having different pulse widths or pulse intervals in the light emission pattern or both are stored. The gaming machine according to claim 4, wherein the pulse pattern memory stores a plurality of different pulse patterns in advance.

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