Angle measuring device

Details Angle measuring device Angle measuring device

1989-09-28

1990-07-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

049452320

ABSTRACT:
An angle measuring device for measuring the turning angle of a crankshaft in an internal combustion engine in order to control the ignition timing, etc. thereof comprises: a rotating disc adapted to rotate in synchronization with the rotation of a crankshaft and having a plurality of slits formed along the circumference thereof; light-emitting elements arranged in the vicinity of the rotating disc; light-receiving elements adapted to receive light emitted from the light-emitting elements through the slits of the rotating disc; a signal processing circuit adapted to measure the turning angle of the rotating disc by processing signals output from the light-receiving elements; a power-source line for supplying power-source voltage to the signal processing circuit; a first diode whose anode and cathode are connected to the input terminal of the signal processing circuit and to the power source line, respectively; and a second diode whose anode and cathode are connected to a ground line and to the input terminal of the signal processing circuit, respectively.

REFERENCES:
patent: 4604521 (1986-08-01), Takekoshi et al.
patent: 4767925 (1988-08-01), Kawamoto

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