Position measuring apparatus

Details Position measuring apparatus Position measuring apparatus

1992-05-04

1993-02-02

Haroian, Harry N.

Geometrical instruments

Distance measuring

Error compensation

33705, G01B 1104

Patent

active

051828677

ABSTRACT:
A position measuring apparatus is described wherein a probing unit is connected with a first object and probes the graduation of a measuring scale which is arranged upon a support member. The support member is fastened to a second object. The support member and the second object have different coefficients of thermal expansion. The support member is rigidly connected with an auxiliary support member. The coefficient of thermal expansion of the auxiliary support member differs from the thermal expansion coefficient of the support member. The cross-sections of the support member and the auxiliary support member are chosen so that the resulting coefficient of thermal expansion of the structural combination of the support member and the auxiliary support member is substantially equal to the coefficient of thermal expansion of the second object.

REFERENCES:
patent: 4593471 (1986-06-01), Nelle
patent: 5050311 (1991-09-01), Nelle
patent: 5065525 (1991-11-01), Szenger

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