| 摘要 |
PROBLEM TO BE SOLVED: To introduce a digital factor into prize-winning probability by means of a blade device which does not allow a game ball to win a prize by opening rotating blades for a short period and which allows the game ball to win a prize only by opening the rotating blades for a long period. SOLUTION: The movable blades 11 have front ends 11b which rotate toward the inside of a prize-winning area 12 with fulcrums 11a pivotally fitted to a game board as respective centers. A pinball game machine includes: a game ball guiding means 13 which guides the game ball to a specific position 11c' of a rolling surface 11c of the game ball when opened; a movable blade rotation means which rotates the movable blades towards the inside of the prize-winning area when opened and holds the movable blades at positions where the game ball guided to the specific position rolls on the rolling surface to be able to enter the prize-winning area; and a movable blade opening control means which with a period required to flow down to the ends 11b of the rolling surfaces from the specific position as a limit value, controls the opening period of the movable blade to an opening period (a) equal to or longer than the limit value and an opening period (a) shorter than the limit value. COPYRIGHT: (C)2010,JPO&INPIT
|
