Rotation angle detecting apparatus
US7378841B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2006 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | Jan 24, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotation angle detecting apparatus includes: a first permanent magnet; a second permanent magnet disposed so as to face the first permanent magnet, the second permanent magnet rotating together with a shaft; an arc-shaped first magnetic member and second magnetic member fixed to the first permanent magnet and the second permanent magnet; and a magnetic resistor disposed in an air gap formed between the first magnetic member and the second magnetic member so as to be axially aligned with the shaft, the first magnetic member and the second magnetic member each including: a projecting portion pointed at the magnetic resistor; and a wall portion surrounding the magnetic resistor so as to prevent influence from external magnetic fields.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.