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US 4,170,829 AGranted
Correction apparatus for longitudinal or angular measuring system
AssigneeDr. Johannes Heidenhain GmbH
InventorGunther Nelle
Life of this patent
Estimating the term…
Abstract
An apparatus for compensating for errors in a longitudinal or angular measuring device includes one or more adjustment members arranged to contact the measuring scale of the measuring device and to deflect the scale out of the graduation plane. The deflection of the scale is used to alter the indicated position as measured by the measuring device in order to accomplish the desired correction.
Claims12
In a measuring device including a measuring scale having spaced graduations and a scanning unit movable along the scale, an error correction apparatus comprising:
- means for deflecting the measuring scale at one or more points along the scale such that the graduations do not lie in a single plane, said deflecting means operating to alter the effective spacing of the graduations to accomplish the error correction.
Dependencies are inferred from the claim text.