| 摘要 |
A solid state touch or push button assembly (10) particularly for elevators, with no moving button parts and operated by capacitive sensing, either as a constant pressure or a auto balancing button. When one touches or pushes on the button, the capacitance is changed and sensed. When so changed, the circuitry causes the electrical or electronic function controlled by the touch button to be activated (or deactivated, depending on the design, or otherwise altered). An annular ring of LEDs (3) located in a light ring (2) surrounding the touch button surface (1) are concurrently activated, providing visual feedback to the button pusher. The light ring includes at its bottom underside an alternating series of triangular, sawtooth or grooved, light entry, diffusing surfaces, with each LED crowned by three such surfaces forming a chamber (24), producing a relatively even, bright, light distribution or halo from the encircling ring surface (2A) surrounding the touch button surface. The chambers lead into a solid, transparent, light-pipelike upper portion (27), which transmits the light coming in from the chambers to the encircling ring area surrounding the button surface. The LEDs are carried on a PCB base (23), which is carried by and keyed to the bottom of the molded body portion of the light ring. |
