MEASURING INSTRUMENT WITH ARC MOTION AND SEPARATED ENCODER TRACKS

原文（中国語）

A measuring instrument includes a movable portion configured to rotate in an arc motion about a pivot portion, and an electronic position encoder configured to measure an absolute relative position between a detector portion and a scale portion, one of which forms part of the movable portion. A maximum movement range of the movable encoder portion is less than 360 degrees. In the scale portion, first and second scale element portions are arranged with central reference points at first and second radial distances RDand RD, respectively, from the pivot portion, for which the ratio of RD/RDis at least 1.4. In various implementations, a separation distance between first and second scale tracks (which include the respective scale element portions) is greater than the first scale track width and the second scale track width.