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Self-referencing capacitive key cell structure and switchcore matrices formed therefrom

  • US 4,876,461 A
  • Filed: 02/23/1989
  • Issued: 10/24/1989
  • Est. Priority Date: 02/23/1989
  • Status: Expired due to Fees
First Claim
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1. In a capacitive key cell of the type including a contact switch in series with a key cell capacitor for use in a matrix of similar capacitive key cells, the improvement wherein each key cell further includes an intracell coactive loading capacitor connected between a low impedance source of constant voltage and the junction of the contact switch with the key cell capacitor.

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