Push button including a photosensor
View Patent ↗With respect to a push button, a part of a depressing portion is detected by a photo sensor when the depressing portion urged upward by a spring is depressed and stroke of the depressed depressing portion reaches a predetermined distance. Thereby, switch between OFF and ON is carried out. Also, the push button includes a metal dome. Load of the spring works on the depressing portion when depressed. Further, when the stroke of the depressed depressing portion reaches a predetermined distance so as to switch between OFF and ON, the load of the spring and that of the metal dome integrally work on the depressing portion.
1. A push button comprising:
a depressing portion;
an urging portion that urges the depressing portion in a first direction;
a detection target portion that pokes out from the depressing portion in a second direction that is opposite to the first direction;
a protruding portion that pokes out from the depressing portion in the second direction;
a photo sensor that detects the detection target portion when the depressing portion is depressed in the second direction by a predetermined distance or longer; and
an elastic portion that gets elastically deformed when the depressing portion is depressed in the second direction by the predetermined distance or longer, wherein
the elastic portion is a dome-shaped metallic round plate;
a round convex portion is arranged in the protruding portion;
a round concave portion is arranged in the elastic portion; and,
the round convex portion contacts the round concave portion when the elastic portion is pushed by the protruding portion.