Winning a prize sphere detector null of pachinko

摘要

PURPOSE:To enable troubles and failures of a prize winning ball detector to be easily detected by providing a pulse width modulating circuit for modulating the pulse width of AC pulse signal given to a current supply line to output it to an output signal line in response to a pulse signal showing the detection of prize winning ball. CONSTITUTION:In a signal processing circuit 84, a signal S5 of a connection of resistances R1, R2 is proportional to a signal S4 and a transistor Tr is turned on or off according to the signal level of signal S5. Since the collector signal of transistor Tr is reversed by an inverter IV, the output signal S6 becomes identical with the signal S4. The signal S6 is input in a microcomputer 81 to be subjected to signal analysis. Namely, the pulse width of input signal is measured by a timer or the like so that a prize winning detecting condition can be judged when the pulse width is narrow and a non-prize winning condition can be judge when the pulse width is wide and equal to the pulse width of AC pulse signal given to a current supply line 67. Also, one time of prize winning is judged even if pulses having narrow pulse width are continuously input, and one time of prize winning is judged when the pulse is transferred from the wide width one to narrow width one.