Current feed circuit for sensor coils in coordinate input...

Details Current feed circuit for sensor coils in coordinate input... Current feed circuit for sensor coils in coordinate input...

2006-01-17

2006-01-17

Chow, Dennis-Doon (Department: 2677)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Stylus

C345S174000, C178S018070

Reexamination Certificate

active

06987507

ABSTRACT:
A current feed circuit for feeding a high-frequency current to a plurality of sensor coils in a coordinate input device includes a high-frequency signal transmitting circuit for generating a high-frequency current corresponding to a high-frequency signal input; a plurality of driver transistors, each being provided between the high-frequency signal transmitting circuit and each of a plurality of sensor coils for transmitting the high-frequency current to the corresponding sensor coil; and a plurality of switches, each being provided with respect to each of the plurality of driver transistors for turning on/off the corresponding driver transistor.

REFERENCES:
patent: 4728944 (1988-03-01), Tamaru et al.
patent: 5796389 (1998-08-01), Bertram et al.

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