Rotation detecting device

Details Rotation detecting device Rotation detecting device

2007-12-11

2007-12-11

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S207200, C324S251000, C324S207210

Reexamination Certificate

active

11819766

ABSTRACT:
A rotation detecting device for detecting a rotating object includes a housing having a bearing and an mounting surface, a rotor member having magnetic peripheral portion and a rotary shaft that is supported by the bearing, a biasing permanent magnet for providing magnetic field around the mounting surface and the magnetic peripheral portion, an IC sensor chip including plural magnetic sensor elements disposed on the mounting surface to provide a sensing signal related to change in magnetic field around the sensor elements, and an IC signal processing chip that provides a rotation signal according to the sensing signal. In this device, the bearing and the mounting surface are integrally formed into the housing at a prescribed distance to secure an unchanged air gap distance.

REFERENCES:
patent: 6366079 (2002-04-01), Uenoyama
patent: 6420865 (2002-07-01), Rettenmeier
patent: 6498479 (2002-12-01), Hamaoka et al.
patent: 6812694 (2004-11-01), Uenoyama
patent: A-62-66117 (1987-03-01), None
patent: A-64-88115 (1989-04-01), None
patent: A-2-262008 (1990-10-01), None

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