Rotational speed transducers
US4093853A · kind A · utility
9Cited by
4References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1977 |
| Grant date | Jun 6, 1978 |
| Priority date | — |
| Expiry date | Feb 22, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P1/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotational speed transducer comprises a member which is mounted to rotate at a speed related to a rotational speed input. A lamp and a photocell are mounted in relation to the rotatable member such that light from the lamp is only reflected by the rotatable member toward the photocell each time a reflector portion or portions of the rotatable member comes into a particular position or positions with respect to the lamp so as to provide an electrical output, from the photocell, which is a measure of the rotational speed input. The reflector portions may be portions of a disc which constitutes the rotatable member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.