Electromagnetic position transducer
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United States of America Patent
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-
Jun 9, 1992
Grant Date -
N/A
app pub date -
Nov 1, 1990
filing date -
Nov 1, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is electromagnetic transducer that does not require complex analog to digital, digital to analog converters, microprocessors or large memory circuitry. The transducer has a helical transmitter coil with tap nodes spaced between its end extremities. An oscillator drives the coil for simultaneously producing oppositely directed current on opposite sides of selected taps, creating a moving fringing field that is compatible with modern graphic display tablet technology. A control circuit of the transducer has a closed-loop integrator for detecting the centroid of a received stylus signal. Analog and digital versions of the integrator are disclosed.
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