Rotation angle detecting device including magnetic member...

Electricity: measuring and testing – Magnetic – Displacement

Reexamination Certificate

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C324S207200

Reexamination Certificate

active

07148680

ABSTRACT:
A rotation angle detecting device for a rotation object includes a rotor and a pair of permanent magnets and a magnetic detector disposed at the rotation axis of the rotation object. One of the permanent magnets has a circumferentially extending rut-shape concavity around the magnet detector or an axially extending elliptic columnar surface having a central portion thicker than others to make magnetic flux density in the vicinity of said magnetic detector constant in an axial or a diametrical direction.

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patent: 64-37607 (1989-02-01), None
patent: 2-122205 (1990-05-01), None
patent: 2-298815 (1990-12-01), None

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