Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1983-06-08
1986-02-25
Little, Willis
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33391, 33402, G01C 906, G01C 912
Patent
active
045718440
ABSTRACT:
An angle change detector which can also be used as an inclination angle detector comprises a pair of opposing magnets, a sector-shaped pendulum made of an electroconductive non-magnetic material and swingable past a spacing between the opposing magnets, and a pair of photosensors disposed on both side edges of the pendulum. Each photosensor comprises a light emitting diode and a phototransistor disposed on both sides of the pendulum. Output signals of the phototransistors are compared with a reference signal for producing an output signal corresponding to the degree of swinging of the pendulum.
REFERENCES:
patent: 2803887 (1957-08-01), Fry
patent: 4277895 (1981-07-01), Wiklund
patent: 4375727 (1983-03-01), McAdam et al.
Iiyama Hiroshi
Komasaku Seiichi
Tanaka Osamu
Watanabe Noboru
Jeco Co., Ltd.
Little Willis
Pfund Charles E.
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