Patent ID: 6964102
Filing Date: 2005-11-15
Classification: G01D

Abstract:
1. A device for detecting the rotational movement of an element which is rotatably arranged around an axis, the device comprising: a material measure that rotates about axis of rotation; a first measuring graduation provided on said material measure and which scans along a first direction, which has a component along said axis of rotation; a second measuring graduation provided on said material measure, wherein both said first measuring graduation and said second measuring graduation surround said axis of rotation in a ring shape, and which can he scanned along said first direction and a second direction that is linearly independent of said first direction; and at least three measuring heads, which are spaced apart from each other along a circumferential direction which surrounds said axis of rotation, are assigned to each of said first measuring graduation and said second measuring graduation for scanning said first measuring graduation and said second measuring graduations.