Segmented-core inductance in stylus for EM-graphical tablet

Details Segmented-core inductance in stylus for EM-graphical tablet Segmented-core inductance in stylus for EM-graphical tablet

1994-07-21

1995-10-24

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

345179, G08C 2100

Patent

active

054612047

ABSTRACT:
A graphical tablet and a stylus interact electromagnetically with one another. The stylus includes a coil and a transducer to affect an inductance of the coil in response to a force exerted on a tip of the stylus. The transducer comprises first and second ferrite cores. The cores are mounted to move with respect to one another in response to the force. The cores are substantially in contact with one another in the absence of the force. Disengaging causes a well detectable jump in the inductance.

REFERENCES:
patent: 4006628 (1977-02-01), St. Jacques
patent: 4713977 (1987-12-01), Koster et al.
patent: 5206785 (1993-04-01), Hukashima
patent: 5231381 (1993-07-01), Duwaer

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