Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-09-28
1990-07-24
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, G01D 534
Patent
active
049437178
ABSTRACT:
An angle measuring device for measuring the turning angle of a crankshaft in an internal combustion engine in order to control, for example, the ignition timing thereof comprises: a rotating disc which is adapted to rotate in synchronization with a crankshaft and which has 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; and a signal processing circuit adapted to process signals output from the light-receiving elements and including: a semiconductor substrate, a plurality of islands formed on the surface of the semiconductor substrate from diffusion layers, a protective-resistor element formed in one of the islands and connected to the light-emitting means, and separation layers separating the island on which the protective-resistor element is formed from the other islands, no other elements being formed on the island on which the protective-resistor element is formed.
REFERENCES:
patent: 3999064 (1976-12-01), Kramer
patent: 4253021 (1981-02-01), Ernst
patent: 4634859 (1987-01-01), Martel
patent: 4766307 (1988-08-01), Pelgrom et al.
patent: 4893007 (1990-01-01), Stannow et al.
Ikeuchi Masayuki
Okamura Kouichi
Allen Stephone B.
Mitsubishi Denki & Kabushiki Kaisha
Nelms David C.
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