Touch sensitive sensor, especially for control and switching purposes, has light source and light-sensitive sensor that detects contact with the walls of light guide between it and the light source as change in intensity

摘要

Touch sensitive sensor (1) has an light guide (2) into which light from a light source (3) is coupled, so that it propagates by total reflection of the fiber surfaces (11). A light sensitive sensor (4) detects contact with the light guide surface because it causes a change in the detected light intensity. The cross section of the light guide can be round or rectangular.