Patent ID: 7041961

Claim:
Device for measurement of a rotational angle of two components that can be rotated relative to each other, with a bushing and shaft stub ( 30 , 33 ) that can be coupled to rotate in unison with a first component ( 50 ), with a materialized measure ( 10 ) connected coaxially and rotating in unison with bushing and shaft stub ( 30 , 33 ), and with a sensing device ( 20 ) that optically senses the materialized measure ( 10 ) connected to rotate in unison with a second component ( 51 ), characterized by the fact that the materialized measure ( 10 ) has an angular lattice structure ( 12 ), that the sensing device ( 20 ) has a circular track of optical sensor elements ( 21 ) spaced apart at an angle and arranged coaxially to bushing and shaft stub ( 30 , 33 ), that a light source ( 31 ) is arranged coaxially in bushing and shaft stub ( 30 , 33 ), that the light source ( 31 ) illuminates the materialized measure ( 10 ), that the sensing device ( 20 ) is arranged on the side of the materialized measure ( 10 ) opposite light source ( 31 ), that the shaft stub ( 33 ) is inserted coaxially into the first component ( 50 ), that the shaft stub ( 33 ) is inserted axially alignable in the first component ( 50 ), that the sensing device ( 20 ) is arranged in a cap ( 40 ) mountable on the second component ( 51 ), and that an inductive current is fed to the light source ( 31 ) via a coil ( 44 ) arranged in cap ( 40 ) to a coil ( 34 ) in bushing and shaft stub ( 30 , 33 ), and rotating therewith.