| 摘要 |
Optical keyboard comprising particularly a plurality of light sources (51), each source being provided to send light on a given path covering the distance of the keyboard, a plurality of photosensors (52), each of them being arranged to receive light from a light path which covers the keyboard, and a plurality of keys (53) having each a coupling position wherein an optical coupling is provided between at least one of said light sources and at least one of said photosensors. The keyboard is characterized in that at least some of the keys are combining keys which are involved only in optical paths (54, 55) of light inlet and outlet which are proper and exclusive to the combining keys, the position of said combining keys being detected whatever the position of other keys of the keyboard, combining or not, may be. |
