Digitizer with capacitive and inductive coupling

Details Digitizer with capacitive and inductive coupling Digitizer with capacitive and inductive coupling

1991-01-15

1992-06-23

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

051245094

ABSTRACT:
A battery powered oscillator in a freely movable pointer drives a coil and a divider. A grid of spaced conductors in a base unit is inductively coupled to the coil. A conductive plate that lies parallel to the conductor grid capacitively couples the signal from the divider to a phase locked loop to provide a reference signal that has a constant phase in relation to the oscillator. Detection circuitry uses the signals induced in selected grid conductors and the phase reference signal to determine the location of the pointer relative to the conductors. As an alternative to the phase locked loop, the signal induced in an idle reference conductor can be combined with the capacitively coupled reference signal to aid in demodulating the induced signals. As an alternative to an oscillator in the pointer, the coil may be driven by a signal capacitively coupled from the base unit.

REFERENCES:
patent: 3732369 (1973-05-01), Cotter
patent: 3767858 (1973-10-01), Rodgers
patent: 4022971 (1977-05-01), Rodgers
patent: 4210775 (1980-07-01), Rodgers et al.
patent: 4423286 (1983-12-01), Bergeron
patent: 4661656 (1987-04-01), Rodgers et al.
patent: 4692568 (1987-09-01), Morita
patent: 4734546 (1988-05-01), Landmeier
patent: 4831216 (1989-05-01), Landmeier
patent: 5007085 (1991-04-01), Greanios et al.

Affiliated with

Also associated with

Rating

Digitizer with capacitive and inductive coupling does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digitizer with capacitive and inductive coupling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digitizer with capacitive and inductive coupling will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-934448