Electronic compass

Details Electronic compass Electronic compass

1988-04-20

1989-12-19

Cuchlinski, Jr., William A.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

G01C 1726

Patent

active

048873586

ABSTRACT:
An electronic compass (10) comprising a circular semi-transparent wheel (12) mounted for rotation in a horizontal plane and carrying a bar magnet (14) mounted radially with the magnets south pole oriented outwardly to cause the wheel to function as a compass. The wheel (12) is provided with a gray scale (16) located around the wheels periphery. One or more light-emitting diodes (LEDs) (18) are mounted below the wheel (12) and a photoresistor (20) is mounted above the wheel in position to receive the light from the LEDs (18) passing through the wheel. The photoresistor provides a signal, indicative of the intensity of the light received to a voltage comparator circuit (22). The circuit (22), in turn, passes signals to a suitable display means (24) to provide a directional indication related to the position of the bar magnet (14). The circuit (22) includes an adjustment means to permit compensation for variations of the movement of the wheel from the correct directional indication as the compass is swung for calibration.

REFERENCES:
patent: 2236543 (1941-04-01), McFaddan
patent: 3100889 (1963-08-01), Cannon
patent: 3833901 (1974-09-01), Fowler
patent: 4163326 (1979-08-01), Edwards
patent: 4446729 (1984-05-01), Watson, III
patent: 4546551 (1985-10-01), Franks
patent: 4564909 (1986-01-01), Kramer
patent: 4654522 (1987-03-01), Gornick et al.

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