Stable wireless pointing device for a tablet

Details Stable wireless pointing device for a tablet Stable wireless pointing device for a tablet

1997-06-24

1998-12-01

Shankar, Vijay

Computer graphics processing and selective visual display system

Display peripheral interface input device

Stylus

345184, 178 1801, 178 1803, 178 1901, 178 1903, 178 2002, G08C 2100, G09G 500

Patent

active

058445480

ABSTRACT:
A system for determining a position of a wireless pointing device relative to the plane of a conductor grid, by inducing currents in the conductor grid, includes a pointing device and a digitizer tablet on which is situated the conductor grid. The pointing device includes an oscillator, a resonator circuit, and a coil to which a tuned alternating current is supplied, and which emits an alternating signal that induces currents in the conductor grid. The power supply of the pointing device includes a DC-DC converter circuit for enabling the power supply to operate with only one low voltage battery, and a voltage stabilizer for preventing drift in the frequency and phase of the signal emitted by the pointing device.

REFERENCES:
patent: 5007085 (1991-04-01), Greanias et al.
patent: 5308936 (1994-05-01), Biggs
patent: 5369227 (1994-11-01), Stone
patent: 5557076 (1996-09-01), Wieczorek

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