Lighting control system for pinball games
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United States of America Patent
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Feb 25, 1992
Grant Date -
N/A
app pub date -
Feb 11, 1991
filing date -
Feb 11, 1991
priority date (Note) -
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Abstract
A lighting control system for pinball games employs a lighting circuit board that supports at least one string of lamps connected in parallel. The lighting board associates a triac with each lighting string for switching the output of an a.c. power supply to each lighting string. The triacs are controlled responsive to the output of a zero-cross detection circuit, which monitors the a.c. power supply. The intensity of the lighting strings is independently controllable responsive to conditions on the game playfield by varying the length of time the triac switches power relative to the zero-crossing point of the output of the a.c. power supply.
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