Apparatus for sensing the position of a pointing object

Details Apparatus for sensing the position of a pointing object Apparatus for sensing the position of a pointing object

2006-02-14

2006-02-14

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S672000

Reexamination Certificate

active

06998856

ABSTRACT:
A computer system (10) includes a keyboard (11), a first pair of position-sensing electrodes (18.1and18.2), a second pair of position-sensing electrodes (20.1and20.2), a signal injection electrode (22) and an oscillator (27). The oscillator injects a signal via the electrode (22) and the operators left hand L, creating a field around the operator's right hand R. The position electrodes are arranged underneath the keyboard and sense the strenght of the field enabling the position of the operator's right hand R in an X-Y plane above the keyboard to be determined. Each position-sensing electrode is coupled to a difference amplifier (28and30) via a pair of buffer amplifiers (40.1, 40.2, 30.1, 30.2). The amplification factor of the buffer amplifiers can be varied so as to scale the field strength values sensed by the electrodes, thereby permitting the output of the difference amplifier to be varied so as to adjust the sensivity of the system to different positions of the operator's hand R.

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