Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD OF FABRICATING MAGNETIC CODER DEVICE AND DEVICE OBTAINED THEREBY
Document Type and Number:
Japanese Patent JP2005043344
Kind Code:
A
Abstract:

To improve a technique for fabricating a magnetic coder device for improving the operation and the coding density which can be attained.

This method comprises the steps of: generating a mixture of ferromagnetic particles or ferrites in a matrix; molding the matrix; and subjecting the molded matrix to a magnetic field so as to obtain a continuous alternation of north and south magnetic poles. The method comprises: using a matrix having viscosity that is sufficiently low to enable the ferrites to migrate; 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 suddenly cooling the matrix while the magnetic field is maintained so as to freeze the particles in the matrix.


Inventors:
SAUTIER PASCAL
ARGY GILLES
Application Number:
JP2004170344A
Publication Date:
February 17, 2005
Filing Date:
June 08, 2004
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
HUTCHINSON SA
International Classes:
G01D5/245; F02D35/00; G01D5/14; G01D5/16; G01P3/487; H01F13/00; H01F41/02; (IPC1-7): G01D5/245; F02D35/00
Attorney, Agent or Firm:
Eiji Saegusa
Kakehi Yuro
Yata Ryuichi