Apparatus for detecting rotational speed
US5962783A · kind A · utility
51Cited by
8References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1997 |
| Grant date | Oct 5, 1999 |
| Priority date | — |
| Expiry date | Jul 15, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.