Low power sensing apparatus for digitizer tablets

Details Low power sensing apparatus for digitizer tablets Low power sensing apparatus for digitizer tablets

1990-11-13

1991-11-19

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

050668331

ABSTRACT:
A digitizer tablet consuming less power than is required of current tablets comprises short duration fast rise time energizing pulses, and a resonant circuit in the induced signal detector tuned to the frequency of the pulse repetition rate or preferably a higher frequency. Peak detector or timed sample and hold circuits are connected to the resonant circuit to improve resolution and reduce noise.

REFERENCES:
patent: 3732369 (1973-05-01), Cotter
patent: 4012588 (1977-03-01), Davis et al.
patent: 4054746 (1977-10-01), Kamm
patent: 4455451 (1984-06-01), Kriz
patent: 4713496 (1987-12-01), Kimura et al.
patent: 4723056 (1988-02-01), Tamaru et al.
patent: 4786765 (1988-11-01), Yamanami et al.
patent: 4806918 (1989-02-01), Berke et al.

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