Portable electronic compass
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
Feb 1, 1991
filing date -
Feb 1, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention is a motion sensitive, battery operated compass utilizing Hall effect digital switches to sense the orientation of the compass in relation to the earth's magnetic field. A vibration sensing circuit serves to turn the compass on when it is in motion, and to turn the compass off when it is at rest. A chopper circuit is provided to interrupt the power supply at a predetermined frequency to conserve battery power. The Hall effect switches are mounted in a known relationship to a rotating magnet allowing selection and decoding of the sensor outputs to provide signals for the operation of an alpha numberic display.
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