Slot machine

Claim 2

A slot machine having plural series of symbols, each of said plural series of symbols being composed of a plurality of symbols arranged in an array and in which each of said plural series of symbols is moved, and when a plurality of combinations of symbols on prize-winning lines coincide with a prize-winning combination, a predetermined prize is awarded, characterised in that the said slot machine comprises; a winning probability table memory (50, 51, 52) for storing a relation between random numbers and the kind of group, said group being one of a plurality of groups into which said prize-winning symbol combinations are classified; sampling means (50, 51, 52) for deriving one of a plurality of said random numbers therefrom; judgement means (50, 51, 52) for judging said kind of group to which said derived random number belongs, by referring to said prize-winning probability table memory; hit request signal generator means (50, 51, 52) for generating a hit request signal in correspondence with the group judged by said judgement means; and control means (40, 41) responsive to said hit request signal for stopping the movement of each of said plural series of symbols.

Claim 3

A slot machine including a plurality of reels on the outer periphery of which a plurality of symbols are disposed at predetermined intervals; a pulse motor for rotating each of said reels; detector means for detecting the state of movement of said plurality of symbols by referring to the rotatory position of said reel within one rotation thereof; and means for judging whether said plurality of symbols stopped on winning lines form any prize-winning symbol combination or not, characterised in that said slot machine comprises; a winning probability table memory for storing a relation between random numbers and the kind of group, said group being one of a plurality of groups into which said prize-winning symbol combinations are classified; sampling means for deriving one of a plurality of said random numbers therefrom; judgement means for judging said kind of group to which said derived random number belongs, by referring to said prize-winning probability table memory; hit request signal generator means for generating a hit request signal in correspondence with the group judged by said judgement means; and control means responsive to said hit request signal for stopping the movement of each of said plural series of symbols.

Claim 4

A slot machine including a plurality of reels on the outer periphery of which a plurality of symbols are disposed at predetermined intervals; a pulse motor for rotating each of said reels; detector means for detecting the state of movement of said plurality of symbols by referring to the rotatory position of said reel within one rotation thereof; and means for judging whether said plurality of symbols stopped on winning lines form any prize-winning symbol combination or not, characterised in that said slot machine comprises; a winning probability table memory for storing a relation between random numbers and the kind of group, said group being one of a plurality of groups into which said prize-winning symbol combinations are classified; sampling means for deriving one of a plurality of said random numbers therefrom; judgement means for judging said kind of group to which said derived random number belongs, by referring to said prize-winning probability table memory; hit request signal generator means for generating a hit request signal in correspondence with the group judged by said judgement means; and control means responsive to said hit request signal for stopping the movement of each of said plural series of symbols.

Claim 5

A slot machine as set forth in claim 2, further comprising count means for calculating the remaining number of wins for each of said group, in which the number of wins obtainable during a predetermined N number of games is decided for each of said group, every time said hit request signal is generated, the remaining number of winnings for a group corresponding to the generated hit request signal is subtracted by "I", and when the remaining number of winnings reaches "0", even if a further hit request signal for said group is generated, said prize-winning symbol combinations belonging to said group are made not to be completed.

Claim 6

A slot machine as set forth in any one of the preceding claims, in which said plurality of groups are classified into three kinds of a big hit, a middle hit, and a small hit.

Claim 7

A slot machine as set forth in claim 4, in which said sampling means is made operative after the start of the movement of said plural series of symbols, and derives one of said random numbers.

Claim 8

A slot machine as set forth in claim 4 or 5, further comprising evaluation means which evaluates, every time one of said reels stops, whether it is possible to complete a prize-winning symbol combination belonging to said group previously determined, and controls said control means in accordance with the evaluated results.

Claim 9

A slot machine as set forth in any one of the preceding claims, further comprising a start lever for initiating the rotation of said plurality of reels.

Claim 10

A slot machine as set forth in any one of the preceding claims, further comprising stop buttons each for stopping the movement of respective series of symbols.

Claim 11

A slot machine as set forth in claim 8, further comprising judging means for judging symbols on said winning lines at a time instant when said stop button is operated, and in which a stop position of the symbols to be stopped by said stop button operation is controlled so as to complete a prize-winning symbol combination belonging to said group previously determined.

Claim 12

A slot machine as set forth in claim 9, in which the stop control is carried out for M frames subsequently following from the time instant when said stop button is operated.

Claim 13

A slot machine as set forth in claim 10, in which said M frames are four frames.