| 摘要 |
A push button switch for use in logic-level switching applications. It has dual-intensity LED backlighting of a display: the switch off-state is low intensity and the on-state is distinctly brighter. The button assembly, not attached to the main body, uses magnets to provide a tactile touch and a retaining force. The backlight power is inductively coupled to the button assembly by a high-frequency oscillator that also limits and controls the LED backlight current. Switching is by a Hall-effect switch; alternate action is by bistable logic; and diode logic provides single-wire switch output and remote-control input. The wire can also carry remotely generated pulse signals to program an alternative active display. There are no mechanisms or wear parts in the assemblies, allowing impregnation sealing. |
