| 摘要 |
<p>PURPOSE: To provide an illumination control device for a pin ball game machine, which can adjust the luminance of a plurality of illumination rows, independent of one another. CONSTITUTION: An illumination control device for a pin ball game machine, an illumination circuit panel 14 which carries thereon at least one of illumination rows 15 in parallel connection. Triacs 15 which are respectively related to the illumination rows 15 so as to selectively supply an output power from an a.c. power source 20 thereto, are controlled in response to an output from a zero-crossing detecting circuit 30 for monitoring the a.c. power source 20. The luminance of the illumination rows can be controlled, independent from each other, in response to a condition of a playing part of a game, by changing a time length by which the triacs 24 changes over the power with respect to a zero crossing point of the output of the a.c. power source.</p> |
