Patent ID: 6311572
Filing Date: 2001-11-06
Classification: F16F,G01D,H03M

Abstract:
A displacement sensor for acquiring the position of two parts that can be moved relative to one another, the first part being assigned at least two sensors and the second part being assigned, in the direction of movement, a sequence of markings formed by the loops of a helix with a variable pitch, said helix being provided on a cylindrical area of the second part which, when congruent with a sensor, trigger the sensor, wherein each marking has a specific distance from its neighboring markings with regard to the direction of movement and a computer calculates, from the phase shift of the signals of the sensor or of the sensors, the distance of the markings situated in the sensor region and, by assignment of the distance, determines the absolute position of the two parts relative to one another, and wherein at least two sensors lie on a plane transverse to the direction of movement which interact with the markings.