Apparatus for detecting rotational speed

Details Apparatus for detecting rotational speed Apparatus for detecting rotational speed

1997-07-15

1999-10-05

Williams, Hezron

Measuring and testing

Speed, velocity, or acceleration

356 25, G01P 1500

Patent

active

059627832

ABSTRACT:
An apparatus for a rotational speed detecting includes a rotating disc having plural slits in a circumferential direction. A radiant element radiates light rays through the slits. A photodetector receives the rays radiated by the radiant element. Peak detectors detects peak points of the detected signal and a calculator calculates a rotational speed. The photodetector include two photodetectors separated by a distance .DELTA.L.

REFERENCES:
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patent: 5051579 (1991-09-01), Tsukiji et al.
patent: 5065324 (1991-11-01), Oshita et al.
patent: 5073710 (1991-12-01), Takagi et al.
patent: 5412302 (1995-05-01), Kido et al.

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