Length measuring apparatus with temperature compensation

Details Length measuring apparatus with temperature compensation Length measuring apparatus with temperature compensation

1987-07-15

1988-10-11

Martin, Jr., William D.

Geometrical instruments

Area integrators

Electrical

33125C, 33125R, G01B 1104

Patent

active

047760982

ABSTRACT:
In a length measuring apparatus for measuring the relative position of two objects movable relative to each other a scanning unit fastened to the first object scans the graduation of a scale fastened to the second object. The scale is connected to the second object at both ends by means of two fastening elements. Each fastening element has a length compensation element allowing translatory movement of bearings at the ends of the scale in the measuring direction. The fixing of a reference point on the scale with respect to the second object is accomplished by means of a fixing element which renders one of the length compensation elements ineffective in its functioning.

REFERENCES:
patent: 4160328 (1979-07-01), Ernst
patent: 4170829 (1979-10-01), Nelle
patent: 4320578 (1982-03-01), Ernst
patent: 4479304 (1984-10-01), Nelle
patent: 4530157 (1985-07-01), Nelle
patent: 4554741 (1985-11-01), Affa
patent: 4584773 (1986-04-01), Rieder et al.

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