Encoder
US6455957B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 9, 2001 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Feb 9, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An encoder includes a plurality of magnetic zones of alternating polarity. At the opposed ends of the encoder magnet are magnetic end zones that provide substantially symmetric magnetic fields. The encoder sensors include first and second sensors that are spaced apart from each other a distance functionally related to the distance between the magnetic end zones. A plurality of first and second sensors are arranged so that the encoder magnet may move relative to the sensors. Each of the first and second sensors provides an associated output signal in response to magnetic influence of the encoder magnet moving past each respective encoder sensor. When each of the first and second encoder sensors senses one of the magnetic end zones of the encoder magnet, the associated output signals are substantially symmetric.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.