Amusement devices: games – Surface projectile game; game element – Projectors
Patent
1985-03-26
1987-01-06
Pinkham, Richard C.
Amusement devices: games
Surface projectile game; game element
Projectors
324208, 335266, 335268, 335298, 336 77, 336117, 336129, 336136, 273121A, H01F 2106
Patent
active
046341269
ABSTRACT:
A transducer converts the amount of mechanical displacement of a member into an electrical signal by magnetic induction. Two fixed coils different in winding direction from each other are spaced apart from each other by a suitable distance and connected in series. Inside the fixed coils, a movable coil is disposed which moves in cooperative association with the member whose amount of movement is to be detected. With the movable coil supplied with an a.c. current, the fixed coils produce an induction current whose amplitude varies with the relative position of the movable coil. A signal processing circuit generates a pulse having a duty ratio corresponding to the amplitude of the induction current. This pulse is converted into a d.c. current in a smoothing circuit to obtain a d.c. voltage corresponding to the amount of mechanical displacement. In a pinball machine, the amount of this voltage regulates the force with which the plunger of a solenoid strikes a ball, thereby to correlate the amount of movement of a handle manipulated by the player with the trajectory of the ball on a playing field.
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"Twenty-Eighth IEEE Vehicular Technology Conference", Denver, CO, Mar. 22-24, 1978, A Multifunction Integrated Circuit for Automotive Sensors, pp. 533-536.
Kabushiki Kaisha Universal
Lastova MaryAnn Stoll
Pinkham Richard C.
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