| 摘要 |
The inventive opto-electronic switch comprises a light-emitting element (1) and a receiving element (2) which outputs a first signal (U(t)) whose value changes according to the amount of light received. The emitting element (1) and the receiving element (2) are arranged in such a manner that the light emitted by the emitting element (1) is diffused or reflected by objects, which are located within a determined area, such that at least one portion of this diffused or reflected light reaches the receiving element (2). The first signal (U(t)) is fed to an evaluation unit in which a switching element (18) changes its switching state if the change of the amount of reflected or dispersed light received by the receiving element, which is caused by motion of the object, is located within the limits of a predetermined motion pattern that corresponds to a tapping of a defined area. The evaluation unit determines time-variable changes in motion and identifies a change in motion of the object as tapping.
|
