Frontally shielded capacitive touch sensor system

Details Frontally shielded capacitive touch sensor system Frontally shielded capacitive touch sensor system

1994-03-16

1995-10-10

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

345173, 345174, G08C 2100, G09G 302

Patent

active

054572894

ABSTRACT:
A frontally shielded capacitive touch sensor system includes a capacitive touch sensor having a touch sensitive surface; a front shield mounted in front of the touch sensor and extending peripherally about the surface surrounding an exposed accessible area of the touch sensitive surface; a device for providing a first voltage on the touch sensor and detecting a change in capacitance representative of a touch to the touch sensor and for providing a second voltage on the front shield for controlling the capacitance between the touch sensor and the front shield and shielding the system from stray capacitance occurring at the front shield.

REFERENCES:
patent: 4831566 (1989-05-01), Matthews et al.
patent: 5381160 (1995-01-01), Landmeier

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