Position Detecting System

摘要

A position detecting system detects and responds to the movement of a target through a sensing domain area of a plane. The movement causes the amount of the target that lies within a sensing domain area to change. A portion of the target always lies within at least one of the sensing domain areas of the plane.

主权项

1. A position detecting system comprising:
a sensor having a coil, the coil having a longitudinal axis, the coil to generate a time varying magnetic field, the time varying magnetic field having a plurality of magnetic field vectors that intersect a sensing domain area of a plane, the plane being substantially orthogonal to the longitudinal axis, each magnetic field vector that intersects the sensing domain area having a normal component that lies orthogonal to the plane and a tangent component that lies parallel to the plane, a magnitude of the normal component being substantially greater than a magnitude of the tangent component, an orientation of the normal component matching an orientation of the time varying magnetic field at an intersection of the longitudinal axis and the plane; a target being movable within the plane, a portion of the target always lying within the sensing domain area of the plane; and a support structure connected to the sensor and the target.