High voltage stylus for portable computers

Details High voltage stylus for portable computers High voltage stylus for portable computers

1997-03-14

1999-11-30

Shankar, Vijay

Telegraphy

Systems

Position coordinate determination for writing

178 1802, 178 1803, 178 1804, 178 1901, 178 1903, G08C 2100

Patent

active

059946512

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:
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patent: 5138118 (1992-08-01), Russell
patent: 5178010 (1993-01-01), Holzel
patent: 5218174 (1993-06-01), Gray et al.
patent: 5225637 (1993-07-01), Rodgers et al.
patent: 5528002 (1996-06-01), Katabami
patent: 5736980 (1998-04-01), Iguchi et al.

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