Patent ID: 6542088
Filing Date: 2003-04-01
Classification: G01B,G01D

Abstract:
A multi-turn rotary encoder, comprising:a first code carrier connected with an input shaft; a scanning device that scans said first code carrier and generates an absolute position of said input shaft within one revolution, and a digital code word is present at an output of said scanning device; a second code carrier for measuring the number of revolutions of said input shaft; a reduction gear arranged between and coupled to said first code carrier and said second code carrier; said second code carrier comprises a magnetic body with at least one north and south pole; a substrate with a spatial arrangement of sensor elements integrated therein, which are sensitive to magnetic fields, is associated with said magnetic body; an evaluation circuit integrated into said substrate, wherein scanning signals, which are phase-shifted with respect to each other, from said sensor elements are supplied, and that said evaluation circuit combines said scanning signals in such a way that a second digital code word is present serially or in parallel at an output of said evaluation circuit; and a combination logical device, which is supplied with said first and second digital code words and which forms a resultant multi-digit code word therefrom.