Patent ID: 6459261
Filing Date: 2002-10-01
Classification: G01B,G01D

Abstract:
A magnetic incremental motion detection system for outputting a pair of digital signals as a collective representation of an incremental movement of an object, said magnetic incremental motion detection system comprising:a target having a surface, said target adjoined to the object to thereby synchronously move with the object; a plurality of indications adjoined to said surface of said target, said indications being serially and uniformly disposed along an area of said surface; a first magnetic sensing device including means for outputting a first digital signal in response to a synchronous movement of said target with the object; a second magnetic sensing device including means for outputting a second digital signal in response to said synchronous movement of said target with the object, said second digital signal being consistently out of phase by a same degree and uniformly offset with respect to said first digital signal to collectively represent incremental movement of the object; and a first magnet having a north pole and a south pole each having a pole face, wherein said first magnetic sensing device includes at least one magnetic flux sensing element aligned with one of said pole faces of said first magnet.