Position locating using digital logic controlled by pulse propagation time intervals
Magnetostrictive position indicator Patent #: 4071818
ApplicationNo. 06/162311 filed on 06/23/1980
US Classes:178/18.02, Error correction178/18.07, Inductive33/1MX-Y motion
ExaminersPrimary: Strecker, Gerard R.
Assistant: Snow, Walter E.
Attorney, Agent or Firm
International ClassesG06F 3/033 (20060101)
G01B 7/004 (20060101)
AbstractAn improved position determination device utilizes an energized movable pointer which is inductively coupled to a grid of spaced parallel electrical conductors for each coordinate direction. The termini of the spaced conductors of each grid are traversed by a respective magnetostrictive element. Strain waves are propagated from the region where each magnetostrictive element is traversed by the respective energized conductors to a sensor and the time between arrival of the strain waves and the arrival of reference strain waves from reference points on the magnetostrictive elements is computed to determine the coordinates of the pointer.