Rotation angle detection apparatus

Details Rotation angle detection apparatus Rotation angle detection apparatus

2008-01-29

2008-01-29

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

Reexamination Certificate

active

07323866

ABSTRACT:
A rotation angle detection apparatus is capable of preventing an eddy current and radio wave noise from being transmitted from outside to a yoke and a permanent magnet through a metal plate, and thence to a non-contact sensor through radiation as it is. The apparatus includes a yoke, a permanent magnet that is arranged on an inner wall surface with magnetic flux flowing from its N pole to its S pole through an inner space thereof, a metal plate formed integral with the yoke and the permanent magnet through a resin by insert molding, and a non-contact sensor arranged in the inner space of the permanent magnet. Between the metal plate and the individual end faces of the yoke and the permanent magnet, there is interposed a high impedance member that prevents radio wave noise from flowing from the metal plate to the yoke and the permanent magnet.

REFERENCES:
patent: 2005/0073299 (2005-04-01), Yoshikawa et al.
patent: 2004-84503 (2004-03-01), None
patent: 2005-233768 (2005-09-01), None

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