Method of fabricating a magnetic coder device, and the device obtained thereby
US7452492B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2004 |
| Grant date | Nov 18, 2008 |
| Priority date | — |
| Expiry date | Oct 25, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/80
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of fabricating a magnetic coder device, the method being of the type consisting in making a mixture of ferromagnetic particles or ferrites in a matrix, in molding the matrix, and in subjecting the molded matrix to a magnetic field so as to obtain a continuous alternation of north and south magnetic poles, which method consists in using a matrix having viscosity that is sufficiently low to enable the ferrites to migrate, in applying a magnetic field during the molding operation while maintaining the matrix at a given temperature in order to reduce its viscosity and thereby making it easier to cause the ferromagnetic particles to migrate and become oriented in their direction of easy magnetization, and to obtain discontinuous shapes having high particle concentration, and in suddenly cooling the matrix while the magnetic field is maintained so as to freeze the particles in the matrix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.