Rotation detector having sensor chip and biasing magnet

Details Rotation detector having sensor chip and biasing magnet Rotation detector having sensor chip and biasing magnet

2006-09-28

2008-12-02

Patidar, Jay M (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S174000, C324S207210, C324S207200

Reexamination Certificate

active

07459905

ABSTRACT:
A rotation detector is positioned to face a rotating object such as a crankshaft of an internal combustion engine. The rotation detector includes a sensor chip mounted on a portion extending from a holder and a magnet for supplying a biasing magnetic field to the sensor chip. Rotation of the rotating object is detected by sensing changes in the magnetic field in which the sensor chip is positioned. A projection is formed on an end surface of the holder while a depression is formed on an end surface of the magnet, and the projection and the depression are tightly engaged with each other to thereby correctly position the magnet relative to the holder. In this manner, the sensor chip is correctly and accurately positioned relative to the biasing magnet. Thus, deviations in rotation detection are minimized, and detection accuracy of the detector is improved.

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Notice of Reasons for Rejection mailed Jul. 8, 2008 in corresponding Japanese Patent Application No. 2005-288245 (English translation attached).

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