Patent ID: 7482547

Claim:
A push button switch, comprising: LEDs disposed adjacent to each other on the same substrate; two light barriers disposed on said substrate and erected apart from each other and in between said LEDs; and one light barrier provided on the back side of a control knob, wherein the distal end of said one light barrier is in a positional relationship of fitting into a gap between the two light barriers, and the two light barriers are tall enough to permit the displacement of said one light barrier when the control knob is pushed in, and the substrate, on which two LEDs are mounted adjacent to each other, and in which a plurality of fitting holes are made, is combined with a base structure in which at least two support arms and two light barriers are given an integral structure, and from which a plurality of wiring terminals protrude, the substrate is placed on the support arms in a state of being in contact with the lower ends of the two light barriers, and the wiring terminals are fitted into the plurality of fitting holes and soldered in place.