Geometrical instruments – Distance measuring – Error compensation
Patent
1990-09-04
1991-11-19
Haroian, Harry N.
Geometrical instruments
Distance measuring
Error compensation
33704, 33707, G01B 1104
Patent
active
050655256
ABSTRACT:
At least one of the surfaces of the glass or glass-ceramic graduated-scale support (12) of a measuring device is drawn toward a corresponding surface of the guide part (11) by the capillary action of a liquid film (13). The graduated-scale support floats without friction on this liquid film and is secured against floating away laterally by low-friction stops (16-18) which can also be formed of the liquid film itself or suitable shaping of graduated-scale support and of the guide part to which it is mounted. The graduated-scale support advantageously consists of a material having a precisely known small coefficient of thermal expansion, such as quartz glass, or of a material having a negligibly small coefficient of expansion, such as the commercially available glass ceramic material known as Zerodur. By these measures, length or other measurement errors attributable to thermal effects are minimized.
REFERENCES:
patent: 4136958 (1979-01-01), Nelle
patent: 4554741 (1985-11-01), Affa
patent: 4684257 (1987-08-01), Hanaoko
Carl-Zeiss-Stiftung Heidenheim/Brenz
Haroian Harry N.
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