Rotation angle detecting device

Details Rotation angle detecting device Rotation angle detecting device

2007-10-23

2007-10-23

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C073S514310, C073S514390

Reexamination Certificate

active

11707158

ABSTRACT:
A rotation angle detecting device is rotated by a rotating object via a gear mechanism to detect a rotation angle of the rotating object. The rotation angle detecting device includes a housing, a magnet rotor unit having a permanent magnet and a central hole, a magnetic sensor unit including a pair of magnetic sensor elements each of which detects magnetic flux density of a magnetic field generated by the permanent magnet in a direction different from the other, and a signal processor that calculates a rotation angle of the rotating object from the magnetic flux density. The magnetic rotor unit includes a mechanism for changing the magnetic flux density as the number of turns of the magnet rotor unit changes.

REFERENCES:
patent: 6630823 (2003-10-01), Tateishi et al.
patent: 6861837 (2005-03-01), Shimizu et al.
patent: 6894487 (2005-05-01), Kunz-Vizenetz

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