Electric field proximity keyboards and detection systems

Computer graphics processing and selective visual display system – Display peripheral interface input device – Including keyboard

Reexamination Certificate

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Details

C345S173000, C345S179000, C341S022000

Reexamination Certificate

active

07145552

ABSTRACT:
The invention is related to an electric field proximity detection system suitable for use as a touch sensitive keyboard or to be used in close proximity without direct contact. In an embodiment of a circuit useful in the system, an AC signal is coupled to a single electrode functioning as an antenna radiating an electric field through a high impedance circuit. A conductive object in close proximity disturbs the field causing a voltage change across nodes of the high impedance circuit that is compared by a detector circuit that generates a DC output indicating an object is close to the electrode. In another embodiment, the circuit couples to an analog multiplexer to control a plurality of electrodes. In another embodiment, a row and column address scheme couples a plurality of electrodes and increases resolution without substantially increasing complexity. The circuits may be integrated in a semiconductor to reduce size and cost. The electric field proximity detection system extends to applications related to object detection such as remote sensing, motion detection and remote controls.

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Jim Midolo, The Advent of Programmable Electronic Keyboards, ECN, Dec. 2001, p. 13, EAO Switch Corp, US.
Touch Sensitive, Touch Sensitive Technology Overview, pp. 15-16, Jun. 2002, EAO, US.

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