High voltage stylus for portable computer

Details High voltage stylus for portable computer High voltage stylus for portable computer

1994-02-04

1998-10-27

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

058280111

ABSTRACT:
The invention concerns a stylus for producing a high-voltage, sinusoidal signal for an electrostatic digitizing pad. The high voltage is obtained by applying a sine wave to one lead of the primary of a transformer, and applying the inverse of the sine wave to the other lead of the primary. The secondary of the transformer produces the high voltage, which is developed into a signal which is applied to the digitizing pad.

REFERENCES:
patent: 4862152 (1989-08-01), Milner
patent: 5054005 (1991-10-01), Schorum
patent: 5138118 (1992-08-01), Russell
patent: 5218174 (1993-06-01), Gray et al.
patent: 5225637 (1993-07-01), Rodgers et al.

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