Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1978-04-06
1980-03-04
Woodiel, Donald O.
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33348, 73178R, 340366B, G01C 2108
Patent
active
041909623
ABSTRACT:
Improvements are disclosed in the pattern cone of the magnetic compass as described and claimed in copending application 769409, Harold T. Lyman, Jr., now U.S. Pat. No. 4,132,113. Simpler apparatus for trimming the sensor outputs of the sine and cosine of the angle between the craft's actual heading and the desired heading, are described and claimed. As in the said copending application the basic apparatus consists of a magnetic compass containing a pattern having a specified relation of black-to-white density with respect to angle, rotating with the compass card, a light source for illumination of the pattern, pairs of sensors mounted in the compass and responsive to the light intensity reflected from or transmitted through the pattern, the output from one pair of sensors being proportional to the sine of the angle made by the sensor pair zero reference line with respect to Magnetic North, and the output of the other pair of sensors being proportional to the cosine of said angle, both outputs being suitable for operation of a remote indicating compass, and various modifications thereof for making the outputs of the sensor pairs proportional to the sine and cosine of the angle between a manually settable desired heading or angle and the angle of the said sensor pair zero reference line with respect to Magnetic North.
REFERENCES:
patent: 3927474 (1975-12-01), Lapeyre et al.
patent: 4132113 (1979-01-01), Lyman
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