Position sensing device

Details Position sensing device Position sensing device

2007-10-02

2007-10-02

Barlow, John (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system

Orientation or position

Reexamination Certificate

active

10995778

ABSTRACT:
A position sensing device having an insulating board, a first conductive sensing element, a second conductive sensing element, an oscillator, conductive material, a differential amplifier, and a processor. The first and second spaced conductive sensing elements are on the insulating board. The oscillator generates an oscillating signals and the conductive material is spaced from the sensing elements. The conductive material receives the oscillating signal to create an electric field between the conductive material and the first and second sensing elements. The differential amplifier includes differential inputs that are connected to the conductive sensing elements. The signal levels at the differential inputs vary based on the position of a pointing object of a user relative to the first and second conductive sensing elements. The processor generates a position signal based on an output of the differential amplifier.

REFERENCES:
patent: 4284947 (1981-08-01), Walton
patent: 5008497 (1991-04-01), Asher
patent: 5149919 (1992-09-01), Greanias et al.
patent: 5159159 (1992-10-01), Asher

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