Capacitive switches do not require any actuating force. They work by the approach of the finger. The electric field (active area) is either printed (printed sensor) or etched (ITO etched sensor). The finger causes a capacitance change, which is detected and evaluated by the sensor or the controller.
Advantages of capacitive switches
- very valuable customer designs can be implemented
- concave and convex user interfaces possible
- slider and wheel functions can be integrated
- production costs are within limits
- high chemical resistance
- easy cleaning
Areas of use
- household appliances
- industrial applications
- medical device manufacturing
In contrast to membrane switches and short-travel keys, there is no tactile feedback. However, this can easily be compensated by an acoustic and optical signal.
Even though the tactile/mechanical keyboard is still the most frequently used input device today, interesting alternatives have arisen with capacitive switches.