Method and apparatus for monitoring wet contact touchpads

Details Method and apparatus for monitoring wet contact touchpads Method and apparatus for monitoring wet contact touchpads

2006-10-10

2006-10-10

Edwards, Jr., Timothy (Department: 2612)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

C341S020000, C200S600000

Reexamination Certificate

active

07119799

ABSTRACT:
Method and apparatus for monitoring wet contact touchpads where the opening of the contacts and the closing of the contacts of a wet contact touchpad are monitored and sensed by a timer/controller. The wet contact touchpad forms a capacitor which is charged to maintain a low voltage when the contacts are open. Upon reaching a predetermined decreasing voltage charge across the wet contact touchpad, the voltage status is further scrutinized by voltage sampling to determine when a contact closure or a contact break has occurred. Such determination is carried out in multiple cycle fashion by quickly and repeatedly introducing a charge voltage, discontinuing the charge voltage, and sampling the charged voltage to determine a decrease or an increase. A decrease indicates a wet contact touchpad closed circuit and an increase indicates a wet contact touchpad open circuit. Sampling of the increasing or decreasing charges determines timed occurrences accurately.

REFERENCES:
patent: 3920940 (1975-11-01), Brown et al.
patent: 4263736 (1981-04-01), Beierwaltes et al.
patent: 4700369 (1987-10-01), Siegal et al.
patent: 5285428 (1994-02-01), Rosow et al.
patent: 5702799 (1997-12-01), Brown et al.

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