Rotational angle detecting device

Electricity: measuring and testing – Magnetic – Displacement

Reexamination Certificate

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C324S207240

Reexamination Certificate

active

07034525

ABSTRACT:
In a rotational angle detecting device, an auxiliary magnet is disposed so as to surround a Hall element around the Z-axis, so that variation of offset magnetic flux is suppressed even when the position of the Hall element is displaced in the X-axis direction with respect to the auxiliary magnet. In addition, even when the fabrication position of the Hall element is displaced in the Y-axis direction of the auxiliary magnet, the variation of the offset magnetic flux is suppressed. By adjusting the dimension (the length in cylinder direction) in the Z-axis direction of the auxiliary magnet, the variation of the offset magnetic flux is suppressed even when the Hall element is displaced from the center of the auxiliary magnet in the Z-axis direction. That is, even when the position of the Hall element is displaced from the center of the auxiliary magnet in the three-dimensional direction, the displacement of the offset magnetic flux can be prevented, and thus reduction of the detection precision can be prevented.

REFERENCES:
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patent: 6356073 (2002-03-01), Hamaoka et al.
patent: 6489761 (2002-12-01), Schroeder et al.
patent: 6753681 (2004-06-01), Enomoto et al.
patent: 2004/0061495 (2004-04-01), Shimomura et al.
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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