an embodiment of the present invention will be explained by referring to the drawings in detail below . fig1 shows an embodiment of a pachinko machine for which an electronic display device and a game board according to the present invention are used , in a front view thereof . in fig1 a reference numeral 1 denotes the frame of the game machine , and a reference numeral 2 denotes a variable display unit of a liquid crystal display disposed on the back of the game board 3 of the pachinko machine . here , the area of the liquid crystal display screen occupies most of the area of the game board 3 , and a picture 18 is generated by a display on the liquid crystal display . the removable game board 3 is installed in front of the liquid crystal display . the base board is constituted of a sufficiently transparent board material which is an acrylic panel here to avoid disturbing the liquid crystal display when viewing it from the front . fig2 shows a cross - sectional side view of the game machine in fig1 wherein a reference numeral 13 denotes a front glass panel , a reference numeral 14 denotes an electronic control board housing , and a reference numeral 15 denotes a start - up winning ball detector . a guide rail 4 , nails 5 , a rotary pinwheel 6 , a start - up winning port 7 , a jackpot port 8 , and other winning ports 10 are arranged on the front side of the game board 3 , while a winning ball guide 9 is arranged on the back . it is effective to constitute them with a transparent material so as to provide them with transparency . the transparent board 3 is installed on the game board 1 in an easily removable fashion such as with screws or by insertion so that it can be easily replaced . although not shown , the game board 3 is arranged with electrical wiring for turning indicators 12 on or off , a drive unit for opening and closing the jackpot port 8 , and its electrical wiring , which are connected to an electronic control board in the electronic control board housing 14 through a connector 16 . the wiring is led to the surrounding nontransparent region by a transparent electrode consisting of ito . referring to fig1 a pachinko ball 17 projected by a ball projector ( not shown ) travels along the guide rail 4 , bumps against or is guided by the nails 5 and the pinwheels 6 while dropping , and , if it enters in the winning port 7 , becomes a winning ball . the winning ball is guided to the winning ball guide 9 , and detected by the start - up winning ball detector 15 ( fig2 ). the detection is converted to an electric signal , which is then input to the electronic control board ( not shown ) in the electronic control board housing 14 ( fig2 ) as an input signal . upon receipt of the signal , a cpu on the electronic control board determines various decisions to control the display screen of the liquid crystal display which constitutes the variable display unit 2 , opening or closing operations of the jackpot port 8 on the game board 3 , and turning the indicator 12 on or off . here , if no ball enters in the start - up winning port 7 for three minutes , the displayed flower 18 starts fading . in addition , a missed ball is returned through a reject port 11 . infrared sensors ( not shown ) are installed around the game board so that the position of the pachinko ball can be detected with a 10 × 10 matrix within the traveling range of the ball . here , it is arranged so that , when a pachinko ball enters in the start - up winning port 7 , a character ( not shown ) displayed on the variable display unit chases the ball dropping on the game board surface . it can be used to detect whether or not a ball enters in the winning port with the sensor . in such a case , it may have a structure that the ball pass through the winning port as is without providing the winning ball guide 9 . with such an arrangement , it becomes possible to avoid a situation such that the display on the variable display unit is hidden by the winning ball guide . it may be also possible to provide a function for detecting the ball on the winning port itself . according to the present invention , the front surface of the variable display unit of the game machine can be utilized as the ball moving region so that there is no limitation on the size of variable display unit and an electronic display device with a large screen can be used for the front surface of the variable display unit of the game machine . as a result , the amount of displayed information is significantly increased so that it becomes possible to provide more variety with the contents of the display and to increase the degree of freedom . thus , in turn , it becomes possible to provide new possibilities and fascination with the pachinko machine or pinball machine . furthermore , it becomes possible to vary the display on the variable display unit and the details of the game such as the number of prize balls according to the movement or speed of a ball passing over the transparent area by detecting the presence of the balls passing over the transparent area . in addition , the updating of pachinko machines can be performed simply by changing the display data for the electronic display device with a large screen on the variable display unit , which can be performed by replacing the electronic control board , and / or by replacing the transparent game board . therefore , the waste produced in the updating of the game machines is only the electronic control board and / or the transparent game board so that waste can be significantly reduced . furthermore , the ease of replacement also reduces the time and cost required for replacement .
a game machine is provided in which the effective area for the game is not restricted even if the display area of the variable display unit is increased . the game machine comprises a variable display unit having an electronic display device , and a transparent area arranged with nails , decorations such as pinwheels , and a winning port which area is provided in front of the variable display unit .