| 摘要 |
A proximity sensor which includes a bar magnet having opposing North and South poles and two magnetic responsive sensors disposed on a lateral face of the magnet between the opposing North and South poles and a pair of corresponding flux concentrators, configured such that the magnetic responsive sensors are sandwiched between the magnet and the flux concentrators along a lateral face of the magnet between opposing pole faces forming a dual-element sensor assembly. In one embodiment the dual-element sensor assembly is adapted to be utilized with a two-channel ferrous target, a target wheel having ferrous targets that are axially separated to correspond to the two-channel sensor assembly. In this embodiment the sensors are configured such that the longitudinal axis of the sensor is generally parallel to the axis of rotation of the ferrous target wheel. In order to provide the directional information, the targets on each channel are also angularly separated on the ferrous target wheel to provide a unique logic sequence for each direction of rotation. In an alternate embodiment the dual element sensor assembly is utilized with a single channel target wheel with the sensors aligned such that the longitudinal axis of the sensor assembly is generally perpendicular to the axis of rotation of the ferrous target such that the sensors are sequentially disposed to a single channel target as the target wheel rotates. Similar to the other embodiment, the alternative embodiment is also able to provide a unique logic sequence depending on the direction of rotation of the ferrous target wheel. Thus, the sensor in accordance with the present invention is not only able to sense the proximity of a ferrous target, but also the direction of rotation of the ferrous target wheel.
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