Patent ID: 8353218

Claim:
A magneto-strictive scanning unit ( 1 ), said unit comprising: a magneto-strictive position sensor ( 2 ); a housing ( 3 ) tightly enclosing the position sensor ( 2 ) configured as a hollow profile ( 4 ) with face cover plates ( 5 a, b ); and at least one actuation pushrod ( 6 ) with at least one scanning head ( 6 a ) supported longitudinally movable in the scanning unit ( 1 ) in parallel to a longitudinal extension ( 10 ) of the position sensor ( 2 ) outside of housing ( 3 ), and on which actuation pushrod is positioned an encoder magnet ( 12 ) for the position sensor ( 2 ) and is fixed longitudinally, wherein said at least one actuation pushrod ( 6 ) is preloaded into a start position through a spring ( 8 ).