Patent Publication Number: US-2009233692-A1

Title: Slot Machine

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims a priority from the U.S. Provisional Patent Application No. 61/035,604 filed on Mar. 11, 2008, the entire contents of which are incorporated herein by reference. 
    
    
     BACKGROUND 
     1. Field of the Invention 
     The present invention relates to a slot machine having a reel which displays the payout amount. 
     2. Description of Related Art 
     As is disclosed in US Patent 2005/0250577A1, for example, conventionally, there has been a slot machine having a rotating wheel which displays the payout amount. 
     When a predetermined condition is met in a slot game, the rotating wheel is rotated and stopped so as to display the payout amount which will be awarded to a player. The rotating wheel is provided separately from a reel which is used for the slot game. 
     Therefore, rotation and stop of the rotating wheel is performed when the slot game is performed. In other words, the rotation and stop of the rotating wheel does not affect a process of the slot game. 
     SUMMARY 
     The present invention has been conceived in view of the above circumstance and the object of the present invention is to provide an unprecedented novel slot machine in which a reel for displaying a payout amount and a reel used for a slot game are combined. 
     To achieve the object of the present invention, there is provided a slot machine comprising: a plurality of payout trigger symbols; a plurality of symbols including the payout trigger symbols; a symbol group comprising the symbols; a plurality of symbol frames in each of which one of the symbols is arranged; a display device for displaying each of the symbol frames; a plurality of payout amount frames being superimposed on a part of each of the symbol frames which is displayed on the display device, a payout amount being arranged in each of the payout amount frames; a unit game in which a payout amount is awarded to a player when all the symbols displayed on the display device are the payout trigger symbols; an input device with which a player performs a betting operation for the unit game; and a processor programmed, for repeating the unit game repeatedly, to execute each of processes from the process of (1) below to the process of (7) below: (1) selecting some of the symbols at random from the symbol group upon completing a betting operation for a current unit game by a player using the input device; (2) displaying on the display device each of the selected symbols being rearranged in each of the symbol frames; (3) determining whether all the symbols displayed on the display device are the payout trigger symbols or not; (4) returning to the process of (1) if it is determined that not all the symbols displayed on the display device are the payout trigger symbols; (5) rearranging each payout amount in each of the payout amount frames if it is determined that all the symbols displayed on the display device are the payout trigger symbols; (6) enlarging a size of each payout amount rearranged in each of the payout amount frames to a size of each of the symbol frames and displaying each of the enlarged payout amount on the display device; and (7) awarding a total amount of the payout amounts that are rearranged in the payout amount frames to the player and returning to the process of (1). 
     Furthermore, according to another aspect of the present invention, there is provided a slot machine, comprising: a plurality of payout trigger symbols; a plurality of symbols including the payout trigger symbols; a symbol group comprising the symbols; a plurality of symbol frames in each of which one of the symbols is arranged; a display device for displaying each of the symbol frames; a plurality of payout amount frames being superimposed on a part of each of the symbol frames which is displayed on the display device, a payout amount being arranged in each of the payout amount frames; a unit game in which a payout amount is awarded to a player when all the symbols displayed on the display device are the payout trigger symbols; an input device with which a player performs a betting operation for the unit game; and a processor programmed, for repeating the unit game repeatedly, to execute each of processes from the process of (1) below to the process of (7) below: (1) selecting some of the symbols at random from the symbol group upon completing a betting operation for a current unit game by a player using the input device; (2) displaying on the display device each of the selected symbols being rearranged in each of the symbol frames and rearranging each payout amount in each of the payout amount frames; (3) determining whether all the symbols displayed on the display device are the payout trigger symbols or not; (4) returning to the process of (1) if it is determined that not all the symbols displayed on the display device are the payout trigger symbols; (5) enlarging a size of each payout amount rearranged in each of the payout amount frames to a size of each of the symbol frames and displaying each of the enlarged payout amount on the display device if it is determined that all the symbols displayed on the display device are the payout trigger symbols; and (6) awarding a total amount of the payout amounts that are rearranged in the payout amount frames to the player and returning to the process of (1). 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a view showing characteristics of a slot machine which is one embodiment of the present invention; 
         FIG. 2  is a perspective view of the slot machine; 
         FIG. 3  is a schematic view showing symbol columns drawn on reel band of each reel; 
         FIG. 4  is a schematic view showing payout amount columns drawn on reel band of each mini reel; 
         FIG. 5  is a block diagram showing an internal construction of entire slot machine; 
         FIG. 6  is a block diagram showing an internal construction of a sub control board; 
         FIG. 7  is a view showing one of an image displayed on a liquid crystal panel; 
         FIG. 8  is a view showing one of an image displayed on the liquid crystal panel; 
         FIG. 9  is a flowchart of a main control program; 
         FIG. 10  is a flowchart of a main game process program; 
         FIG. 11  is a flowchart of a unit game process program; 
         FIG. 12  is a view showing characteristics of a slot machine which is other embodiment of the present invention; 
         FIG. 13  is a flowchart of a unit game process program. 
     
    
    
     DETAILED DESCRIPTION 
     1. Characteristics of the Present Invention 
       FIG. 1  is a view showing characteristics of a slot machine which is one embodiment of the present invention. Incidentally, the portion from the above will be described for specifying a state of a liquid crystal panel  5 B in  FIG. 1 . 
     In the slot machine according to the present embodiment, a slot game attempting rearrangement of three payout trigger symbols is executed. 
     In the slot game, as shown in  FIG. 1 , symbol display frames W 1 , W 2  and W 3  arranging three symbols are displayed on the known liquid crystal panel  5 B. In this respect, three video reels R 1 , R 2  and R 3  are assigned to three symbol display frames W 1 , W 2  and W 3 , respectively. Therefore, one of symbols drawn on a reel band of each video reel R 1 , R 2  and R 3  is arranged in each of the symbol display frames W 1 , W 2  and W 3 . Payout amount display frames Q 1 , Q 2  and Q 3  are superimposed on the symbol display frames W 1 , W 2  and W 3 , respectively. In this respect, the three payout amount display frames Q 1 , Q 2  and Q 3  are assigned to three mini reels M 1 , M 2  and M 3 , respectively. Therefore, one of payout amounts drawn on a reel band of each mini reel M 1 , M 2  and M 3  is arranged in each payout amount display frame Q 1 , Q 2  and Q 3 . Incidentally, each mini reel M 1 , M 2  and M 3  is a kind of reel which is displayed on the liquid crystal panel  5 B with video data. Further, the liquid crystal panel  5 B has a bet amount display portion  7 , a payout amount display portion  8  and a credit amount display portion  9 . Incidentally, a touch panel  101  is provided on a front face of the liquid crystal panel  5 B. 
     Namely, in this slot game, a slot game is executed such that the three video reels R 1 , R 2  and R 3  rearrange a symbol of “FRANKENSTEIN” which is the payout trigger symbol, in the symbol display frames W 1 , W 2  and W 3  of the liquid crystal panel  5 B. When each video reel R 1 , R 2  and R 3  is rotated and stopped, one symbol is rearranged in each symbol display frame W 1 , W 2  and W 3 , respectively. 
     When the symbol of “FRANKENSTEIN” is rearranged in each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panels  5 B shown on both sides in the upper stage of  FIG. 1 , each mini reel M 1 , M 2 , M 3  is displayed by a scrolling manner in each payout amount display frame Q 1 , Q 2  and Q 3  after a predetermined time has passed. 
     After a predetermined time has further passed, each mini reel M 1 , M 2  and M 3  automatically is displayed by a stopped manner on the liquid crystal panel  5 B shown on the right side in the middle stage of  FIG. 1 . Therefore, one of the payout amounts drawn on the reel band of each mini reel M 1 , M 2  and M 3  is rearranged in each payout amount display frame Q 1 , Q 2  and Q 3 , respectively. 
     Then, as shown on the liquid crystal panel  5 B shown on both sides in the middle stage of  FIG. 1 , each payout amount display frame Q 1 , Q 2  and Q 3  is displayed being enlarged to fit into a size of each symbol display frame W 1 , W 2  and W 3 . Accordingly, the payout amount rearranged in each payout amount display frame Q 1 , Q 2  and Q 3  is displayed being enlarged. 
     Further, the total amount of the payout amounts that have been rearranged in the payout amount display frames Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B is computed. As shown on the liquid crystal panel  5 B shown on the left side in the middle stage of  FIG. 1 , the payout amount which is computed by multiplying the total amount by the bet amount which is indicated by a player is displayed in the payout amount display portion  8 . With this, the computed payout amount is awarded to the player. Incidentally, the bet amount which is indicated by a player is displayed in the bet amount display portion  7 . When the slot game is finished, the payout amount displayed in the payout amount display portion  8  is added to the amount in the credit amount display portion  9 , and the added amount is displayed in the credit amount display portion  9 , as shown on the liquid crystal panel  5 B shown on the left side in the lower stage of  FIG. 1 . 
     With this, a unit game of a slot game is configured. 
     2. Construction of the Slot Machine 
     Hereinafter, the one embodiment embodying the present invention will be explained in detail with reference to the drawings. 
     First, an outline construction of the slot machine  1  according to the present embodiment will be explained with reference to  FIG. 2 .  FIG. 2  is a perspective view of the slot machine  1  according to the present embodiment. 
     As shown in  FIG. 2 , the slot machine  1  is an upright type slot machine arranged in a game arcade such as casino, in order to execute predetermined game modes, such slot machine includes a cabinet  3  in which electronic and mechanical components are installed. For example, as a display portion  4  to display information concerning a game, there are provided an upper display portion  4 A, a middle variable display portion  4 B and a lower display portion  4 C. Each display portion  4 A to  4 C is mounted at the front of the oblong cabinet  3 . The upper display portion  4 A includes a liquid crystal panel  5 A which is arranged above the middle variable display portion  4 B. On the liquid crystal panel  5 A, for example, an effect image, an introduction of a game content, and a rule explanation of a game are displayed. The lower display portion  4 C is arranged below the middle variable display portion  4 B, and includes a plastic panel  5 C on which images are printed, and a plastic panel  5 C is lightened by backlights. 
     The middle variable display portion  4 B, which is used to display an execution state of a game, includes the liquid crystal panel  5 B which is fixed at the front door of the cabinet  3 . In this liquid crystal panel  5 B, three symbols of the video reels are displayed by a scrolling manner and by a stopped manner, respectively. In the middle variable display portion  4 B, the three symbol display frames W 1 , W 2  and W 3  corresponding to each video reel R 1 , R 2  and R 3  are displayed on the liquid crystal panel  5 B. Further, in the middle variable display portion  4 B, the three payout amount display frames Q 1 , Q 2  and Q 3  corresponding to each mini reel M 1 , M 2  and M 3  are displayed on the liquid crystal panel  5 B. Each of the payout amount display frames Q 1 , Q 2  and Q 3  is superimposed on each corresponding symbol display frame W 1 , W 2  and W 3 . Further, a touch panel  101  is provided on the front surface of the liquid crystal panel  5 B. On the lower position of the middle variable display portion  4 B, the bet amount display portion  7 , the payout amount display portion  8  and the credit amount display portion  9  are arranged on the liquid crystal panel  5 B. Also the upper portion of the middle variable display portion  4 B, is related to the back side, thereby a player may play a game in a cozy posture. 
     Now, images of a slot game to be displayed on the liquid crystal panel  5 B are explained.  FIG. 7  and  FIG. 8  are drawings showing contents displayed on the liquid crystal panel  5 B, as one example of images of a slot game to be displayed on the liquid crystal panel  5 B. As shown in  FIG. 7  and  FIG. 8 , on the liquid crystal panel  5 B in a slot game, the symbol drawn on the reel band of each video reel R 1 , R 2  and R 3  is displayed in each symbol display frames W 1 , W 2  and W 3 , so that they can be viewed by a player.  FIG. 7  shows a state in which the symbol drawn on the reel band of each video reel R 1 , R 2  and R 3  is arranged or rearranged in each symbol display frames W 1 , W 2  and W 3  of the liquid crystal panel  5 B.  FIG. 8  shows a state in which the symbol drawn on the reel band of each video reel R 1 , R 2  and R 3  is displayed by a scrolling manner in each symbol display frames W 1 , W 2  and W 3  of the liquid crystal panel  5 B. Incidentally, on the reel band of each video reel R 1 , R 2  and R 3 , a symbol column constructed from twenty-two symbols is drawn respectively (refer to  FIG. 3 ). 
     On the liquid crystal panel  5 B, as shown in  FIG. 7  and  FIG. 8 , the payout amount display frame Q 1 , Q 2  and Q 3  is superimposed on each corresponding symbol display frame W 1 , W 2  and W 3  while a slot game is executed. Further, the payout amount drawn on the reel band of each mini reel M 1 , M 2  and M 3  is displayed in each corresponding payout amount display frame Q 1 , Q 2  and Q 3 , so that they can be viewed by a player.  FIG. 7  and  FIG. 8  show a state in which the payout amount drawn on the reel band of each mini reel M 1 , M 2  and M 3  is arranged or rearranged in each corresponding payout amount display frame Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B. Incidentally, a column of the payout amounts including twenty-two payout amounts is drawn on the reel band of each mini reel M 1 , M 2  and M 3  (refer to  FIG. 4 ). 
     As shown on the liquid crystal panel  5 B shown on the right side in the upper stage of  FIG. 1 , the payout amount drawn on the reel band of each mini reel M 1 , M 2  and M 3  is displayed by a scrolling manner in each corresponding payout amount display frame Q 1 , Q 2  and Q 3 , after the payout trigger symbol is rearranged in each symbol display frame W 1 , W 2  and W 3 . Further, as shown on the liquid crystal panel  5 B shown on both sides in the middle stage of  FIG. 1 , each payout amount display frame Q 1 , Q 2  and Q 3  is displayed being enlarged so as to be interposed on each corresponding symbol display frame W 1 , W 2  and W 3 , after the payout amount is rearranged in each payout amount display frame Q 1 , Q 2  and Q 3 . Accordingly, each payout amount displayed in the payout amount display frame Q 1 , Q 2  and Q 3  is displayed being enlarged. 
     Returning to  FIG. 7  and  FIG. 8 , the bet amount display portion  7 , the payout amount display portion  8  and the credit amount display portion  9  are arranged on the liquid crystal panel  5 B. On the bet amount display portion  7 , the bet amount which is indicated by the current player is displayed. On the payout amount display portion  8 , the payout amount awarded in a slot game to a player is displayed. On the credit amount display portion  9 , the credit amount which is owned by the current player is displayed. 
     Therefore, on the liquid crystal panel  5 B in a slot game, one symbol which is drawn on the reel band of each video reel R 1 , R 2  and R 3  is arranged in each of the three symbol display frames W 1 , W 2  and W 3 . In addition, one payout amount which is drawn on the reel band of each mini reel M 1 , M 2  and M 3  is arranged in each of the three payout amount display frames Q 1 , Q 2  and Q 3 . 
     Returning to  FIG. 2 , between the middle variable display portion  4 B and the lower display portion  4 C, at the front of the cabinet  3 , an operation table  10  which is projected forward is arranged. On the operation table  10 , a variety of operation buttons  11  including a BET button, a collecting button, a spin button and a CASHOUT button are arranged as an operation portion to execute a game. On the operation table  10 , a coin insertion slot  12  and a bill insertion slot  13  are arranged. Also between the operation table  10  and the middle variable display portion  4 B, a ticket printer  14 , a card reader  15  and a reader/writer  15  are arranged. At the lowest position of the cabinet  3 , a coin tray  16  is also arranged. 
     Incidentally, in the slot machine  1  of the present embodiment, gaming medium may be coin, bill, or electronic value (credit). Here, the gaming medium may be others as well, such as medal, token, electronic money, or ticket. 
     Further, on the cabinet  3  of the slot machine  1 , light emitting portions  20  are arranged around a game area including the upper display portion  4 A, the middle variable display portion  4 B, the lower display portion  4 C and the operation table  10 . 
     Furthermore, the slot machine  1  also includes a topper effect device  28  which is installed on the cabinet  3 . The topper effect device  28  is shaped in a rectangular board shaped, and is arranged almost parallel to the liquid crystal panel  5 A of the upper display portion  4 A. The cabinet  3  is further provided with speakers  23  on its both sides. 
     3. Outline of Symbols 
     Next, the symbols drawn on the reel band of each video reel R 1 , R 2  and R 3  will be explained with reference to  FIG. 3 . These symbols are scrolled and rearranged in each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B in a slot game.  FIG. 3  is a schematic view showing symbol columns drawn on the reel band of each video reel R 1 , R 2  and R 3 . 
     On the reel band of each video reel R 1 , R 2  and R 3 , twenty-two symbols are arranged respectively. Each symbol column of video reel R 1 , R 2  and R 3  is constructed from the symbols including “FRANKENSTEIN”, “BLUE7”, “BELL”, “APPLE”, “CHERRY”, “ORANGE” and “PLUM”. And the symbols of predetermined types are arranged in a predetermined sequence. In other words, a symbol group is composed of each of the symbols of “FRANKENSTEIN”, “BLUE7”, “BELL”, “APPLE”, “CHERRY”, “ORANGE” and “PLUM”. 
     Incidentally, to each symbol composing the symbol column of each video reel R 1 , R 2  and R 3  shown in  FIG. 3 , a code number is allocated from top to down in sequence. 
     4. General Description of the Payout Amount 
     Subsequently, the payout amounts drawn on the reel band of each mini reel M 1 , M 2  and M 3  will be explained with reference to  FIG. 4 . These payout amounts are scrolled and rearranged in each payout amount display frame Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B while a slot game is executed.  FIG. 4  is a schematic view showing columns of the payout amounts drawn on the reel band of each mini reel M 1 , M 2  and M 3 . 
     Each mini reel M 1 , M 2  and M 3  is a kind of reel which is displayed on the liquid crystal panel  5 B with video data. Twenty-two payout amounts are drawn on the reel band of each mini reel M 1 , M 2  and M 3 . The column of the payout amounts of each mini reel M 1 , M 2  and M 3  is comprised of a combination of the payout amounts including “100”, “50”, “10”, “5”, “3” and “1”. Predetermined kinds of payout amounts are positioned in a predetermined order. 
     In this respect, the total amount of the payout amounts which are rearranged in the payout amount display frames Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B corresponds to the payout amount which is awarded to a player. 
     Incidentally, to each of the payout amount composing the column of the payout amounts of each mini reel M 1 , M 2  and M 3  shown in  FIG. 4 , a code number is allocated from top to down in sequence. 
     5. Internal Construction of the Slot Machine 
     Next, an internal construction of the above slot machine  1  will be explained with reference to  FIG. 5  and  FIG. 6 . 
       FIG. 5  is a block diagram showing an internal construction of entire slot machine  1 . As shown in  FIG. 5 , the slot machine  1  includes a plurality of construction elements such as a main control board  71 , in which a microcomputer  31  is included. The main control board  71  is constructed from the microcomputer  31 , a random number generation circuit  35 , a sampling circuit  36 , a clock pulse generation circuit  37  and a frequency divider  38 . The main control board  71  also includes an illumination effect driving circuit  61 , a hopper driving circuit  63 , a payout completion signal circuit  65  and a display portion driving circuit  67 . 
     The microcomputer  31  is constructed from a main CPU  32 , a RAM  33  and a ROM  34 . The main CPU  32  runs based on programs stored in the ROM  34 , and inputs/outputs a signal with other elements through an I/O port  39 , so as to execute control of the entire slot machine  1 . Data and programs used when the main CPU  32  runs are stored in the RAM  33 . For example, after-mentioned random numbers which are sampled by the sampling circuit  36  are stored temporarily after a start of a game, also the code numbers of the respective video reels R 1 , R 2  and R 3  and the symbol numbers are stored in the RAM  33  and also the code numbers of the respective mini reel M 1 , M 2  and M 3  and the payout numbers are stored in the RAM  3 . Programs executed by the main CPU  32  and permanent data are stored in the ROM  34 . 
     Especially, the programs stored in the ROM  34  include game programs and game system programs (abbreviated as “the game programs and the like” hereinafter). Further, the first lottery programs mentioned below and the second lottery programs mentioned below are also included in the game programs. 
     The first lottery program is a program used to determine the code numbers of the respective video reels R 1 , R 2  and R 3  that correspond to each symbol rearranged in the respective symbol display frames W 1 , W 2  and W 3  of the liquid crystal panel  5 B. Then, in the lottery program, it is included symbol weighing data corresponding to each of plural kinds of payout rates (for example, 80%, 84%, and 88%). The symbol weighing data are the data indicating correlation between the code number of each video reel R 1 , R 2  and R 3  and one or plural random numbers belonging to a predetermined number range (0 to 255), every each of the three video reels R 1 , R 2  and R 3 . In other words, each of the code number of one video reel R 1 , R 2  and R 3  is associated with one or more random numbers corresponding to the payout rate. The random numbers are extracted by the lottery program, and symbols specified finally by the random numbers are rearranged in the respective symbol display frames W 1 , W 2  and W 3  of the liquid crystal panel  5 B. 
     The second lottery program is a program used to determine the code numbers of the respective mini reels M 1 , M 2  and M 3  that correspond to each of the payout amounts rearranged in the respective payout amount display frames Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B. Then, in the lottery program, it is included weighing data corresponding to each of plural kinds of payout rates (for example, 80%, 84%, and 88%). The weighing data are the data indicating correlation between the code number of each mini reel M 1 , M 2  and M 3  and one or plural random numbers belonging to a predetermined number range (0 to 255), every each of the three mini reels M 1 , M 2  and M 3 . In other words, each of the code number of one mini reel M 1 , M 2  and M 3  is associated with one or more random numbers corresponding to the payout rate. The random numbers are extracted by the lottery program, and the payout amounts specified finally by the random numbers are rearranged in the respective payout amount display frames Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B. 
     Random numbers over a predetermined range are generated by the random number generation circuit  35 , which is operated based on instructions from the main CPU  32 . The random numbers are voluntarily extracted from the random numbers generated by the random number generation circuit  35  by the sampling circuit  36 , based on instructions from the main CPU  32 , and the extracted random numbers are input to the main CPU  32 . The base clock for running the main CPU  32  is generated by the clock pulse generation circuit  37 , and signals which are generated by dividing the base clock in a predetermined frequency are input to the main CPU  32  by the frequency divider  38 . 
     And to the main control board  71 , the touch panel  101  is connected. The touch panel  101  is arranged in front of the liquid crystal panel  5 B, and specifies the coordinate position of the portion touched by a player. The position on which a player touched and the direction of the movement of the touched portion are determined based on the specified coordinate position information. A signal corresponding to the determination is input to the main CPU  32  through the I/O port  39 . 
     Also, the operation buttons  11  for instructing an execution of a game are connected to the main control board  71 . The operation buttons  11  include the spin button, the collecting button and the BET button and the like. A signal corresponding to the depressing of these buttons is input to the main CPU  32  through the I/O port  39 . 
     A ticket printer  14 , a reader/writer  15 , a coin sensor  21  and a bill sensor  22  are connected to the main control board  71 . The reader/writer  15  reads information from an IC card and writes information in an IC card. The ticket printer  14  prints tickets with bar codes. The bill sensor  22  detects a bill inserted to the bill slot  13  one by one and sends a signal corresponding to the detection to the main CPU  32  via the I/O port  39 . The coin sensor  21  detects a coin inserted to the coin slot  12  one by one and sends a signal corresponding to the detection to the main CPU  32  via the I/O port  39 . 
     An effect signal which is used to conduct illumination effect is output to the above-mentioned light emitting portions  20  and the topper effect device  28  by the illumination effect driving circuit  61 . Then, the topper effect device  28  is serially connected to the illumination effect driving circuit  61  through the light emitting portions  20 . 
     A hopper  64  is driven by the hopper driving circuit  63  based on control of main CPU  32 . The hopper  64  executes payout of coins, and coins are paid out from the coin tray  16 . Data of the number of coins are input from the connected coin detecting portion  66  by the payout completion signal circuit  65 . When the number of coins becomes a predetermined number, a signal indicating completion of the coins is input to the main CPU  32 . The number of the coins paid out from the hopper  64  is calculated by the coin detecting portion  66 , and the data of the number calculated are input to the payout completion signal circuit  65 . The each display operation of the bet amount display portion  7 , payout amount display portion  8  and credit amount display portion  9  is controlled by the display portion driving circuit  67 . 
     Furthermore, a sub control board  72  is connected to the main control board  71 . The sub control board  72  is connected to the liquid crystal panel  5 A, the liquid crystal panel  5 B and the speakers  23 . 
       FIG. 6  is a block diagram showing an internal construction of the sub control board  72 . As shown in  FIG. 6 , a command from the main control board  71  is input to the sub control board  72 . The display control on the liquid crystal panel  5 A of the upper display portion  4 A and the liquid crystal panel  5 B of the variable display portion  4 B, and the sound output control on the speaker  23  are executed by the sub control board  72 . The sub control board  72  is constructed on a circuit board different from the circuit board for the main control board  71 , and includes a microcomputer  73  (abbreviated as “sub-microcomputer” hereinafter) as a main construction element, and a sound source IC  78 , a power amplifier  79  and an image control circuit  81 . The sound source IC  78  controls the sound output from the speakers  23 , the power amplifier  79  is used as an amplification device, and the image control circuit  81  runs as a display control device of the liquid crystal panel  5 A and  5 B. 
     The sub-microcomputer  73  includes a sub CPU  74 , a program ROM  75 , a work RAM  76 , an IN port  77  and an OUT port  80 . The control operations are executed by the sub CPU  74  based on a control order sent from the main control board  71 , the program ROM  75  is used as a memory device. Although a clock pulse generation circuit, a frequency divider, a random number generation circuit and a sampling circuit are not included in the sub control board  72 , the sub control board  72  is constructed so as to execute random number sampling according to operation programs thereof. Control programs executed by the sub CPU  74  are stored in the program ROM  75 . The work RAM  76  is constructed as a temporary storing device when the above control programs are executed by the sub CPU  74 . 
     The image control circuit  81  includes an image control CPU  82 , an image control work RAM  83 , an image control program ROM  84 , an IN port  85 , an image ROM  86 , a video RAM  87  and an image control IC  88 . Images displayed on the liquid crystal panel  5 A and  5 B are determined by the image control CPU  82 , based on parameters set by the sub-microcomputer  73 , according to image control programs stored in the image control program ROM  84 . 
     The image control programs regarding to a display of the liquid crystal panel  5 A,  5 B and a variety of selection tables are stored in the image control program ROM  84 . The image control work RAM  83  is constructed as a temporary storing device when the image control programs are executed by the image control CPU  82 . Images corresponding to contents determined by the image control CPU  82  are formed by the image control IC  88 , and are output to the liquid crystal panel  5 A,  5 B. 
     In the image ROM  86 , dot data used to form images are stored. Thus, it stores the dot data on symbols drawn on the reel band of the each video reel R 1 , R 2  and R 3  and the dot data on the payout amounts drawn on the reel band of the each mini reel M 1 , M 2  and M 3 . The video RAM  87  runs as a temporary storing device when the images are formed by the image control IC  88 . 
     Further, based on a control signal from the main CPU  32 , the image control circuit  81  performs display control of scrolling display/stop display of the video reels R 1 , R 2  and R 3  in the respective symbol display frames W 1 , W 2  and W 3  of the liquid crystal panel  5 B. In addition, based on a control signal from the main CPU  32 , the image control circuit  81  performs display control of scrolling display/stop display of the mini reels M 1 , M 2  and M 3  in the respective payout amount display frames Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B. 
     6. General Description of a Slot Game 
     Next, the payout amount when a slot game is executed in the slot machine  1  according to the present embodiment employing the video reels R 1 , R 2  and R 3  will be explained. 
     The symbol of “FRANKENSTEIN” is the payout trigger symbol. That is, only when the symbol of “FRANKENSTEIN” is rearranged in each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B while a slot game is executed, a payout is awarded to a player. An amount of the payout corresponds to a total amount of the payout amounts which are rearranged in the payout amount display frames Q 1 , Q 2  and Q 3  on the liquid crystal panel  5 B, respectively. 
     Here, the total amount indicates the payout amount when the bet amount is “1”. Therefore, when the bet amount is “1”, the total amount is paid out, and when the bet amount is more than “2”, the payout amount obtained by multiplying the total amount by the bet amount is paid out. 
     Therefore, on the liquid crystal panel  5 B, for example, when “50” is rearranged in the payout amount display frame Q 1 , and “1” is rearranged in the payout amount display frame Q 2 , and “100” is rearranged in the payout amount display frame Q 3 , an amount obtained by multiplying “151”, which is a total amount of the payout amounts rearranged in the payout amount display frames Q 1 , Q 2  and Q 3 , by the bet amount will be paid out. 
     Incidentally, if the symbol of “FRANKENSTEIN” is not rearranged in any one of the symbol display frames W 1 , W 2  and W 3  of the liquid crystal panel  5 B, a player has lost and no payout for losing is made. 
     As mentioned above, in the slot machine  1  according to the present embodiment, a slot game is executed. 
     In other words, in a slot game, the slot game is executed by rearranging the symbol of “FRANKENSTEIN” by three video reels R 1 , R 2  and R 3  in the symbol display frames W 1 , W 2  and W 3  of the liquid crystal panel  5 B. In the slot game, firstly, a part of symbol column (one symbol) drawn on the reel band of each video reel R 1 , R 2  and R 3  (shown in  FIG. 3 ), is arranged in each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B (refer to  FIG. 7 ). Here, after a player sets the bet amount by depressing the BET button among the operation buttons  11 , if the player depresses the spin button among the operation buttons  11 , each of the video reels R 1 , R 2  and R 3  rotates, the symbol column drawn on the reel band of each video reel R 1 , R 2  and R 3  shown in  FIG. 3 , is scrolled from up to down in the symbol display frames W 1 , W 2  and W 3  of the liquid crystal panel  5 B (refer to  FIG. 8 ). 
     After a predetermined time, each of the video reels R 1 , R 2  and R 3  stops automatically, a part of symbol column (one symbol) drawn on the reel band of each video reel R 1 , R 2  and R 3  shown in  FIG. 3 , is rearranged in each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B (refer to  FIG. 7 ). 
     Then, as shown on the liquid crystal panel  5 B shown on both sides in the upper stage of  FIG. 1  above, when the symbol of “FRANKENSTEIN” is rearranged in each of the symbol display frames W 1 , W 2  and W 3 , respectively, each mini reel M 1 , M 2  and M 3  is automatically displayed by a scrolling manner after a predetermined time has passed. Therefore, the column of the payout amounts drawn on the reel band of each mini reel M 1 , M 2  and M 3  shown in  FIG. 4  is scrolled from up to down in each payout amount display frame Q 1 , Q 2  and Q 3 , regardless of whether a player has depressed the operation button  11  such as the BET button or the spin button. 
     After a predetermined time has further passed, each mini reel M 1 , M 2  and M 3  is automatically displayed by a stopped manner as shown on the liquid crystal panel  5 B shown on the right side in the middle stage of  FIG. 1  above. Therefore, a part (one payout amount) of the column of the payout amounts drawn on the reel band of each mini reel M 1 , M 2  and M 3  shown in  FIG. 4  is rearranged in each payout amount display frame Q 1 , Q 2  and Q 3  (refer to the right side in the middle stage of  FIG. 1 ). 
     Then, as shown on the liquid crystal panel  5 B shown on both sides in the middle stage of  FIG. 1  above, each payout amount display frame Q 1 , Q 2  and Q 3  is displayed being enlarged to fit into a size of each symbol display frame W 1 , W 2  and W 3 , respectively. Accordingly, the payout amount rearranged in each payout amount display frame Q 1 , Q 2  and Q 3  is displayed being enlarged. 
     Further, as shown on the liquid crystal panel  5 B shown on the left side in the middle stage of  FIG. 1 , a total amount of the payout amounts rearranged in the payout amount display frames Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B is computed. Then, as shown on the liquid crystal panel  5 B shown on the left side in the lower stage of  FIG. 1  above, a payout amount obtained by multiplying the computed total amount by the bet amount will be awarded to a player. 
     7. Operation of the Slot Machine 
     Next, a main control program executed in the slot machine  1  according to the present embodiment will be explained with reference to drawings.  FIG. 9  is a flowchart of the main control program. 
     First, when a power switch is pressed (power activation), the microcomputer  31  is started to operate, an initial setting process is executed by the microcomputer  31  in step (abbreviated as “S”)  1 . In the initial setting process, BIOS stored in the ROM  34  is executed by the main CPU  32 . Compressed data included in the BIOS are expanded to the RAM  33 , and when the BIOS expansion to the RAM  33  is executed, a diagnosing process and initialization process of various peripheral devices are executed. Also, the game programs and the like are written from the ROM  34  to the RAM  33  by the main CPU  32 , so as to obtain the payout rate setting data and country ID information. Also, during execution of the initial setting process, a verification process to each program is executed. 
     Then in S 2 , the main CPU  32  reads out the game programs and the like from the RAM  33 , and executes the programs in sequence so as to conduct the main game process. A game is executed in the slot machine  1  according to the present embodiment by executing the main game process. Then, the main game process is repeated when the power is supplied to the slot machine  1 . 
     Next, a sub process of the main game process in S 2  above will be explained with reference to  FIG. 10 .  FIG. 10  is a flowchart of the main game process program in the slot machine  1  according to the present embodiment. Incidentally, each program shown in the flowchart of  FIG. 10  is stored in the ROM  34  or the RAM  33  of the slot machine  1 , and is executed by the main CPU  32 . 
     First, as shown in  FIG. 10 , a start acceptance process is executed by the main CPU  32  in S 11 . At this time, in the start acceptance process, an insertion of coins or a bet operation using the BET button among the operation buttons  11  is executed by a player. 
     Then, in S 12 , the main CPU  32  determines whether or not unit game start conditions are met. Here, the unit game start conditions are that the spin button among the operation buttons  11  is depressed. Accordingly, this determination is made based on a signal which is input to the main CPU  32  depending on depressing the operation buttons  11 . At this point, if the spin button among the operation buttons  11  is not depressed (S 12 : NO), the process returns to the start acceptance process (S 11 ) again. Thereby, an operation of changing the bet amount and the like are possible. In contrast, if the spin button among the operation buttons  11  is depressed (S 12 : YES), the bet amount set based on the above bet operation is reduced from the credit amount owned by the player at the moment, and is stored in the RAM  33  as bet information. Incidentally, the credit amount after the reduction is also stored in the RAM  33  as credit information. Then, by sending a control signal to the display portion driving circuit  67 , the main CPU  32  displays the credit information stored in the RAM  33  (the credit amount after the above reduction) on the credit amount display portion  9  of the liquid crystal panel  5 B. 
     Then, when the process proceeds to S 13 , the main CPU  32  executes a unit game process. So, a sub process of the unit game process will be explained based on  FIG. 11 .  FIG. 11  is a flowchart of the sub process of the unit game process program in the slot machine  1  according to the present embodiment. Incidentally, a program shown in the flowchart of  FIG. 11  is stored in the ROM  34  or the RAM  33  of the slot machine  1 , and is executed by the main CPU  32 . 
     First, in the unit game process of S 13  above, as shown in  FIG. 11 , the main CPU  32  executes a symbol random select process in S 21 . Specifically, when the first lottery program included in the game programs is executed by the main CPU  32 , the random number corresponding to each video reel R 1 , R 2  and R 3  respectively is selected from a range of “0 to 255”. Then, with reference to the symbol weighting data corresponding to the payout rate setting data, based on the three random numbers, the code number of each video reel R 1 , R 2  and R 3  is determined by the main CPU  32 . The main CPU  32  stores the determined code number of each video reel R 1 , R 2  and R 3  in the RAM  33  by overwriting code number information for symbol in the RAM  33  with the determined code number of each video reel R 1 , R 2  and R 3  so as to correspond to each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B. Thereafter, the process proceeds to S 22 . 
     Here, the code number of each video reel R 1 , R 2  and R 3  is associated with the symbol number to be rearranged in each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B, so each symbol to be rearranged in such game is determined by overwriting the code number information for symbol in the RAM  33  with the code number of each video reel R 1 , R 2  and R 3  determined by the main CPU  32  so as to correspond to each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B. For example, if the main CPU  32  determines that all of the code number of each video reel R 1 , R 2  and R 3  are “21” and then overwrites the code number information for symbol in the RAM  33  with the code number of each video reel R 1 , R 2  and R 3  so as to correspond to each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B, the main CPU  32  determines to rearrange the three symbols of “FRANKENSTEIN” (refer to  FIG. 3 ). Thus, by overwriting the code number information for symbol in the RAM  33  with the code number of each video reel R 1 , R 2  and R 3  selected by a lottery so as to correspond to each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B, each symbol to be rearranged in a unit game of a slot game is determined. 
     Subsequently, when proceeding to S 22 , the main CPU  32  executes a symbol display process. In other words, by sending a control signal to the sub control board  72 , the main CPU  32  starts a scrolling display of each video reel R 1 , R 2  and R 3  in each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B. After that, an effect mode (a display mode of images on the liquid crystal panel  5 B and a sound output mode from the speakers  23 ) for each unit game is determined by the main CPU  32 , and the sub control board  72  is ordered to start the effect in a predetermined effect pattern. Then, when a predetermined timing to stop displaying each video reel R 1 , R 2  and R 3  in scrolling manner comes, the main CPU  32 , by sending a control signal to the sub control board  72 , stops scrolling of each video reel R 1 , R 2  and R 3  being displayed. The stop operation is based on the code number stored in the RAM  33  by overwriting the code number information for symbol in the RAM  33  with the code number so as to correspond to each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B. With this, each symbol which determined in S 21  above-mentioned is rearranged in each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B. 
     After that, when proceeding to S 23 , the main CPU  32  determines whether or not the payout trigger symbol is realized. Here, when the symbol of “FRANKENSTEIN” is rearranged in each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B respectively, it is determined that the payout trigger symbol is realized. Therefore, the determination is made based on the code number in the RAM  33  by overwriting the code number information for symbol in the RAM  33  with the code number so as to correspond to each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B. At this point, if the payout trigger symbol is not realized (S 23 : NO), the process returns to the start acceptance process (S 11 ) in the above-mentioned main game process of  FIG. 10  above. In contrast, if the payout trigger symbol is realized (S 23 : YES), the process proceeds to S 24 . 
     In S 24 , the main CPU  32  executes a payout amount random select process. Specifically, when the second lottery program included in the game programs is executed by the main CPU  32 , the random number corresponding to each mini reel M 1 , M 2  and M 3  respectively is selected from a range of “0 to 255”. Then, with reference to the weighting data corresponding to the payout rate setting data, based on the three random numbers, the code number of each mini reel M 1 , M 2  and M 3  is determined by the main CPU  32 . The main CPU  32  stores the determined code number of each mini reel M 1 , M 2  and M 3  by overwriting code number information for payout amount in the RAM  33  with the determined code number of each mini reel M 1 , M 2  and M 3  so as to correspond to each payout amount display frame Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B. Thereafter, the process proceeds to S 25 . 
     Here, the code number of each mini reel M 1 , M 2  and M 3  is associated with the payout number to be rearranged in each payout amount display frame Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B, so each of the payout amounts to be rearranged in such game is determined by overwriting the code number information for payout amount in the RAM  33  with the code number of each mini reel M 1 , M 2  and M 3  determined by the main CPU  32  so as to correspond to each payout amount display frame Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B. For example, if the main CPU  32  determines that all of the code number of each mini reel M 1 , M 2  and M 3  are “21” and then overwrites the code number information for payout amount in the RAM  33  with the code number of each mini reel M 1 , M 2  and M 3  so as to correspond to each payout amount display frame Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B, the main CPU  32  determines to rearrange the three payout amounts of “100” (refer to  FIG. 4 ). Thus, by overwriting the code number information for payout amount in the RAM  33  with the code number of each mini reel M 1 , M 2  and M 3  selected by a lottery so as to correspond to each payout amount display frame Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B, each payout amount to be rearranged in a unit game of a slot game is determined. 
     Subsequently, when proceeding to S 25 , the main CPU  32  executes a payout amount display process. In other words, by sending a control signal to the sub control board  72 , the main CPU  32  starts a scrolling display of each mini reel M 1 , M 2  and M 3  in each payout amount display frame Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B. After that, an effect mode (a display mode of images on the liquid crystal panel  5 B and a sound output mode from the speakers  23 ) for each unit game is determined by the main CPU  32 , and the sub control board  72  is ordered to start the effect in a predetermined effect pattern. Then, when a predetermined timing to stop displaying each mini reel M 1 , M 2  and M 3  in scrolling manner comes, the main CPU  32 , by sending a control signal to the sub control board  72 , stops scrolling of each mini reel M 1 , M 2  and M 3  being displayed. The stop operation is based on the code number stored in the RAM  33  by overwriting the code number information for payout amount in the RAM  33  with the code number so as to correspond to each payout amount display frame Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B. With this, each of the payout amounts that determined in S 21  above-mentioned is rearranged in each payout amount display frame Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B. 
     Then, the main CPU 32  executes a payout amount zoom display process in S 26 . In this process, by sending a control signal to the sub control board  72 , the main CPU 32  executes the following display control. 
     Namely, as shown on the liquid crystal panel  5 B shown on the both sides in the middle side of  FIG. 1  above, each payout amount display frame Q 1 , Q 2  and Q 3  is displayed being enlarged to fit into a size of each symbol display frame W 1 , W 2  and W 3 . Accordingly, the payout amount rearranged in each payout amount display frame Q 1 , Q 2  and Q 3  is displayed being enlarged. 
     Further, the main CPU  32  computes a payout amount obtained by multiplying a total amount of the payout amounts rearranged in the payout amount display frames Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B by the bet amount. Incidentally, the computation is executed based on the bet information in the RAM  33  and the code number information for payout amount. The computed payout amount is stored in RAM  33  as payout information. After that, by sending a control signal to the display portion driving circuit  67 , the main CPU  32  displays the payout information stored in the RAM  33  (the above-mentioned computed amount) on the payout amount display portion  8  of the liquid crystal panel  5 B. 
     Then, the main CPU  32  executes a payout process in S 27 . In the payout process, the payout amount awarded to a player in a slot game is paid out to the player based on the payout information stored in the RAM  33 . 
     When the payout is executed, the credit amount stored in the RAM  33  as the payout information (the payout amount awarded to a player in a slot game) are added to the credit amount stored in the RAM  33  as the credit information, and the added value is overwritten in the RAM  33  as the credit information. After that, by sending a control signal to the display portion driving circuit  67 , the main CPU  32  displays the credit information stored in the RAM  33  (the added value computed in S 27 ) on the credit amount display portion  9  of the liquid crystal panel  5 B. At the same time, the main CPU  32  overwrites “0” to the RAM  33  as the payout information, and displays “0” on the payout amount display portion  8  of the liquid crystal panel  5 B by sending a control signal to the display portion driving circuit  67 . 
     Incidentally, in the payout process, the credit amount owned by a player at the moment may be paid out by coins corresponding to the credit amount (one credit equals to one coin) based on the player&#39;s depressing the CASHOUT button among the operation buttons  11 , or may also be paid out by a ticket with a bar code which is printed by the ticket printer  14 . 
     Then, after the main CPU  32  executes the above-mentioned payout process in S 27 , the process returns to the start acceptance process (S 11 ) in the above-mentioned main game process of  FIG. 10  above. 
     8. Others 
     Incidentally, the present invention is not limited to the above embodiments, but various changes may be made without departing from its scope. 
     For example, as shown in  FIG. 12 , the payout amount may be rearranged in each payout amount display frame Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B by each unit game of a slot game regardless of whether the symbol of “FRANKENSTEIN” is rearranged in each symbol display frame W 1 , W 2  and W 3  on the liquid crystal panel  5 B. 
     In other words, as shown on the liquid crystal panel  5 B shown on the left side in the upper stage of  FIG. 12 , when each video reel R 1 , R 2  and R 3  is rotated in the symbol display frames W 1 , W 2  and W 3 , respectively, each mini reel M 1 , M 2  and M 3  is also displayed by a scrolling manner in the payout amount display frames Q 1 , Q 2  and Q 3 . 
     When a predetermined time has further passed, as shown on the liquid crystal panel  5 B shown on the right side in the upper stage of  FIG. 12 , each video reel R 1 , R 2  and R 3  automatically stops and each mini reel M 1 , M 2  and M 3  is automatically displayed in a stopped manner. Accordingly, one of the symbols drawn on the reel band of each video reel R 1 , R 2  and R 3  is rearranged in each symbol display frame W 1 , W 2  and W 3 , respectively. Further, one of the payout amounts drawn on the reel band of each mini reel M 1 , M 2  and M 3  is rearranged in each payout amount display frame Q 1 , Q 2  and Q 3 , respectively. 
     Here, as shown on the liquid crystal panel  5 B shown on the right side in the upper stage of  FIG. 12 , when the symbol of “FRANKENSTEIN” is rearranged in each symbol display frame W 1 , W 2  and W 3 , respectively, the following display control will be performed. 
     Namely, as shown on the liquid crystal panel  5 B shown on the right side in the lower side of  FIG. 12 , each payout amount display frame Q 1 , Q 2  and Q 3  is displayed being enlarged to fit into a size of each symbol display frame W 1 , W 2  and W 3 . Accordingly, the payout amount rearranged in each payout amount display frame Q 1 , Q 2  and Q 3  is displayed being enlarged. Further, a total amount of the payout amounts rearranged in the payout amount display frames Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B is computed. A payout amount obtained by multiplying the total amount by the bet amount which is indicated by a player is displayed in the payout amount display portion  8 . With this, the obtained payout amount will be awarded to the player. Incidentally, the bet amount which is indicated by the player is displayed in the bet amount display portion  7 . 
     When the slot game is finished, the payout amount displayed in the payout amount display portion  8  is added to the amount in the credit amount display portion  9 , and the added amount is displayed in the credit amount display portion  9 , as shown on the liquid crystal panel  5 B shown on the left side in the lower stage of  FIG. 1 . 
     Therefore, also in this case, only in a unit game in which the symbol of “FRANKENSTEIN” is rearranged in each symbol display frame W 1 , W 2  and W 3  of the liquid crystal panel  5 B, respectively, a total amount of the payout amounts rearranged in the payout amount display frames Q 1 , Q 2  and Q 3  of the liquid crystal panel  5 B is computed. A payout amount obtained by multiplying the computed total amount by the bet amount will be awarded to the player. 
     For executing such a slot game, the main CPU  32  executes a unit game process program shown in  FIG. 13  instead of the unit game process program shown in  FIG. 11 . Compared to the unit game process program shown in  FIG. 11 , the unit game process program shown in  FIG. 13  is different in that the processes of S 24  and S 25  are executed prior to the process of S 23 . Other processes are the same in the unit game process program shown in  FIG. 13  and the unit game process program shown in  FIG. 11 , so detailed explanation will be omitted.