Detection means for touch control switches

Details Detection means for touch control switches Detection means for touch control switches

1978-04-12

1979-11-20

Hix, L. T.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

361181, 331 65, H01H 3500

Patent

active

041752392

ABSTRACT:
In a touch control system including one or more touch sensitive devices which capacitively transmit a relatively large electrical signal when not touched and transmit a relatively small electrical signal when touched an improved means for detecting the touch and no-touch conditions of the touch sensitive devices includes a comparator having positive feedback associated therewith. By increasing or decreasing the positive feedback the touch control system is operable either asynchronously or synchronously with an external control system. Furthermore, a plurality of touch sensitive devices may be multiplexed utilizing a single detection means constructed in accordance with the invention disclosed herein while requiring a relatively low voltage drive signal.

REFERENCES:
patent: 3492440 (1970-01-01), Cerbone
patent: 3549905 (1970-12-01), Johnson
patent: 3581124 (1971-05-01), Flores
patent: 3621307 (1971-11-01), Raven
patent: 3958239 (1976-05-01), Green

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