Portable electronic compass

Details Portable electronic compass Portable electronic compass

1991-02-01

1992-10-27

Cuchlinski, Jr., William A.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33355R, G01R 3304, G01C 1728

Patent

active

051578417

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.

REFERENCES:
patent: 3921305 (1975-11-01), King, Jr. et al.
patent: 3971981 (1976-07-01), Nakagome et al.
patent: 4402142 (1983-09-01), Dinsmore
patent: 4459749 (1984-07-01), Rieder et al.
patent: 4672565 (1987-06-01), Kuno et al.
patent: 4677754 (1987-07-01), Hormel
patent: 4791729 (1988-12-01), Suda
patent: 4859944 (1989-08-01), Webb

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