Patent ID: 8069580
Filing Date: 2011-12-06
Classification: G01D,H03M

Abstract:
1. A measuring device for determining a position and/or a speed, comprising: a scale having marks arranged in spaced-apart relationship and designed as magnets or as magnetizable components; and a scanning head, wherein the scale and the scanning head are arranged for movement relative to one another along a movement direction, said scanning head constructed to determine a first spacing of the scanning head in the movement direction relative to a first one of the marks, and a second spacing of the scanning head in the movement direction relative to a second one of the marks, with the position and/or the speed being determined on the basis of the first spacing and the second spacing, said scanning head having at least two measuring systems for determining the first spacing and the second spacing, each said measuring system having a measuring rod and a sensor device which generates an electric pulse that traverses the measuring rod and generates a structure borne sound wave at one of the marks, with the sensor device recording a temporal arrival of the structure borne sound wave.