Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-09-28
1990-06-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, B01D 534
Patent
active
049356224
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; a photodiode adapted to receive light emitted from the light-emitting elements through the slits of the rotating disc; a resistor for converting electric-current signals output from the photodiode into voltage signals; a clamping device for clamping the maximum voltage at the output terminal of the converter to such a voltage value as will not allow the photodiode to be forward-biased, and a signal processing circuit adapted to measure the turning angle of the rotating disc by processing the electric-current signals converted into voltage signal by the resistor.
REFERENCES:
patent: 3836260 (1974-09-01), Ulyanov et al.
patent: 3944813 (1976-03-01), Fowler
patent: 4418288 (1983-11-01), Imai et al.
patent: 4636630 (1987-01-01), Nagai
patent: 4733070 (1988-03-01), Ookawa et al.
patent: 4827122 (1989-05-01), Ikeda
Hata Toshiaki
Ikeuchi Masayuki
Allen Stephone B.
Mitsubishi Denki & Kabushiki Kaisha
Nelms David C.
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