| 摘要 |
<p>The apparatus has light sources (10, 11) emitting light that is visible to a human eye, and an operating plate (1) including a signal-transmitter surface region with a coating (21) for transmitting infrared light. A light source emits light of infrared wavelength, where the plate includes sensor surface regions (51-53) on a side that is turned away from a user. The sensor surface region is provided with the coating for partially transmitting the infrared light, and proximity sensors (31-33) are arranged behind the sensor surface region and sensitive to the infrared light.</p> |
