US Patent 11656685 Information handling system keyboard with haptic enhanced membrane trigger

A portable information handling system includes a keyboard having a first set of conventional keys with a first travel distance to impact a membrane, such as keys having rubber dome biasing devices, and a second set of keys having a second smaller travel distance to impact the membrane with an alternative biasing device and haptic feedback to reinforce an input feel for an end user. In one example embodiment, the second set of keys are biased upward with a compressible foam with the membrane raised by a platform structure under the second set of keys and a piezoelectric device under the membrane for each key to provide a vibration when the membrane detects an input.