Patent ID: 11880506
Assignee: SENSEL, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 4:
5. The keyboard system of claim 4, wherein the controller is configured to:
register the first keystroke of the first key type in response to the first voltage exceeding a first threshold voltage magnitude;
drive the oscillating voltage across the first inductor at a first frequency during the first haptic feedback cycle in response to registering the first keystroke;
register release of the first keystroke from the first key location on the tactile layer in response to the second voltage exceeding a second threshold voltage magnitude less than the first threshold voltage magnitude; and
drive the second oscillating voltage across the first inductor at a second frequency greater than the first frequency during a second haptic feedback cycle in response to registering release of the first keystroke from the first key location.