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Methods and apparatus for capacitively detecting key motion and finger presence on a magnetic keyboard key

  • US 9,941,878 B2
  • Filed: 06/27/2016
  • Issued: 04/10/2018
  • Est. Priority Date: 01/04/2013
  • Status: Active Grant
First Claim
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1. A key assembly for use in a keyboard, the assembly comprising:

  • a key guide including a first magnetic component;

    a keycap including a second magnetic component and configured to be pressed downwardly relative to the key guide; and

    a first keystroke sensor comprising a transmitter electrode and a receiver electrode, wherein the transmitter electrode and the receiver electrode are configured to measure a variable capacitance affected by a change in a capacitive coupling between the first and second magnetic components occurring during a keystroke.

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