Patent ID: 7676935

Claim:
An angle-measurement system, comprising: a scanning head; and a bearing assembly including: graduated ring; an outer ring; and rolling bodies; wherein the graduated ring is rotatable about an axis relative to the outer ring; wherein a separate rolling surface is formed on each of the graduated ring and the outer ring, the rolling surface of the graduated ring having a smaller path radius than the rolling surface of the outer ring; wherein the rolling surface of the outer ring is arranged opposite the rolling surface of the graduated ring, the rolling bodies arranged between the two rolling surfaces such that the bearing assembly is free of radial play; wherein an angle scaling is applied directly onto the graduated ring such that a geometrical pattern of the angle scaling in a first region deviates from a geometrical pattern of the angle scaling in a second region as a function of rotational eccentricities of the bearing assembly; and wherein the scanning head is configured to scan the angle scaling.