Jeco Co., Ltd.

Osamu Tanaka

Noboru Watanabe

Hiroshi Iiyama

Seiichi Komasaku

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.

Angle change detector

An inclinometer comprising a sector weight pivotally supported on a main body which may become inclined, the weight being relatively rotatable with respect to the main body and constantly hanging vertically due to gravity regardless of an inclination of the main body. A code part is provided on the weight, corresponding to a plurality of bits based on a predetermined code according to a relative rotary angle of the weight with respect to the main body, and a detecting part which becomes inclined together with the main body and becomes displaced with respect to the weight along each of the bits of the code part, produces a detection output based on the predetermined code according to the inclination angle of the main body.

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Kawasaki, Japan

Osamu Tanaka