Patent ID: 6522128
Filing Date: 2003-02-18
Classification: G01B,G01D,H05K

Abstract:
An apparatus for use in a position encoder comprising:a first plurality of conductor tracks arranged along a measurement path; a second plurality of conductor tracks arranged along said measurement path; wherein the first and second pluralities of conductor tracks are superimposed on each other to define (i) a first circuit having at least two series connected loops arranged along the measurement path; and (ii) a second circuit having at least one loop which extends along said measurement path; characterised in that the conductor tracks of said first plurality of conductor tracks which form part of said first circuit are arranged in first and second groups which are transversely spaced relative to said measurement path; the conductor tracks of said second plurality of conductor tracks which form part of said first circuit are arranged for connecting conductor tracks in the first group with conductor tracks in the second group; and the conductor track or tracks of said first plurality of conductor tracks which form said at least one loop of said second circuit are located between and electrically separate from said first and second groups of conductor tracks.