Length or angle measuring apparatus

Details Length or angle measuring apparatus Length or angle measuring apparatus

1990-11-14

1991-09-24

Cuchlinski, Jr., William A.

Geometrical instruments

Distance measuring

Environmental isolation

33702, G01B 1104

Patent

active

050503111

ABSTRACT:
A length or angle measuring apparatus which measures the relative position of two objects comprises a scale attached to a first object to be measured and a scanning unit which has at least one scanning element connected to the second object to be measured, wherein the second object and the scanning unit have different thermal expansion coefficients. The graduation of the scale is scanning by a scanning element of the scanning unit at a scanning point. Fastening means are provided which fasten the scanning unit to the second object to be measured, such that the scanning point of the scanning element of the scanning unit has no zero point displacement with temperature changes.

REFERENCES:
patent: 3816002 (1974-06-01), Wieg
patent: 4262423 (1981-04-01), Affa
patent: 4593471 (1986-06-01), Nelle
"Neuere Entwicklunger biefotoelektrischen Langenmessgeraten" by A. Ernst Messen und Prufen/Automatik.

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