Detector device for simultaneously detecting both the direction and number of rotations of rotating member
US5004981A · kind A · utility
20Cited by
7References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1989 |
| Grant date | Apr 2, 1991 |
| Priority date | — |
| Expiry date | Nov 9, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0971
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor for detecting a number of revolutions of a rotary shaft is provided which comprises a ring magnet secured to the outer peripheral surface of the rotary shaft, the number of revolutions of which is to be detected, a Hall IC arranged near the outer peripheral surface of the rotary shaft, for detecting the magnetism of the ring magnet. The ring magnet has one circumferential half of the outer peripheral surface thereof magnetized to serve as the north pole and the other circumferential half of the outer peripheral surface thereof magnetized to serve as the south pole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.