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Europäisches Patentamt

MAGNETISCHER CODIERER UND HERSTELLUNGSVERFAHREN DAFÜR | CODEUR MAGNÉTIQUE ET SON PROCÉDÉ DE FABRICATION | MAGNETIC ENCODER AND MANUFACTURING METHOD THEREOF

Patentnummer:EP2952858B1
IPC Hauptklasse:G01D0005245
Anmelder:
Erfinder:
Anmeldung:30.04.15
Offenlegung:04.06.14
Patenterteilung:14.10.20

Abstract / Hauptanspruch
Provided is a magnetic encoder in which the outer diameter of an annular plastic magnet is increased to widen a magnetic force stable region, and a manufacturing method thereof. An axial-type magnetic encoder 1 includes: an annular fixing member 2 that has a cylindrical part 2A attached to a rotating body and an inward flange part 2B extended radially inward from an end edge of the cylindrical part 2A and is fabricated by press molding; and an annular plastic magnet 3 that is attached by injection molding to a sensor-opposed surface of the annular fixing member 2. The magnetic encoder 1 has a high-form accuracy surface (outer diameter FD of a flat surface) on the sensor-opposed surface more radially outward than a range of a diameter (d - 2·r) determined by an inner diameter d of the cylindrical part 2A and a radius r of a corner between the cylindrical part 2A and the inward flange part 2B. An outer diameter MD of the annular plastic magnet 3 is positioned on the high-form accuracy surface.



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