Digitizer system with passive pointer

Details Digitizer system with passive pointer Digitizer system with passive pointer

1990-05-22

1991-09-03

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

050456458

ABSTRACT:
A driving grid is driven by an ac signal comprising a carrier frequency modulated by a lower frequency. An untethered, batteryless pointer includes a pick-up coil in a first tuned circuit tuned to the carrier frequency, connected by diodes to a driving coil in a second tuned circuit tuned to the lower modulating frequency. Energy picked up by the first tuned circuit from the driving grid at the carrier frequency drives the second tuned circuit at the modulating frequency. Modulating frequency signals induced in the receiving grid conductors are used to locate the pointer in the usual manner. Because the carrier signal contains no frequency component of the modulating signal, the driving grid and receiving grid are sufficiently decoupled.

REFERENCES:
patent: 3689885 (1972-09-01), Kaplan et al.
patent: 4023167 (1977-05-01), Wahlstrom
patent: 4423286 (1983-12-01), Bergeron
patent: 4697050 (1987-09-01), Farel et al.
patent: 4704501 (1987-11-01), Taguchi et al.
patent: 4734546 (1988-03-01), Landmeier
patent: 4786765 (1988-11-01), Yamanami et al.
patent: 4878553 (1989-11-01), Yamanami et al.
patent: 4902858 (1990-02-01), Yamanami et al.

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