Positioner with long travel in two dimensions

Details Positioner with long travel in two dimensions Positioner with long travel in two dimensions

1996-02-21

1997-12-23

Fulton, Christopher W.

Geometrical instruments

Miscellaneous

Light direction

33568, 33573, 33DIG1, G01B 700, B25H 100, B23Q 1600

Patent

active

056996217

ABSTRACT:
A precision positioning system is provided which provides long travel in two of the linear dimensions, while using non-contact bearings for both a first subassembly which provides long travel in one of the linear dimension and a second subassembly which provides long travel in the second linear dimension. The first or upper subassembly is preferably a magnetic subassembly which, in addition to providing long travel, also compensates or positions in three rotary dimensions and in the third linear dimension. The second subassembly is preferably either an air bearing or magnetic subassembly and is normally used only to provide long travel. Angled surfaces may be provided for magnetic bearings and capacitive or other gap sensing probes may be mounted to the stage and ground flush with the bearing actuators to provide more precise gap measurements.

REFERENCES:
patent: 3377711 (1968-04-01), Wempe
patent: 4575942 (1986-03-01), Moriyama
patent: 4676649 (1987-06-01), Phillips
patent: 5105552 (1992-04-01), Bielle
patent: 5142791 (1992-09-01), Kobayashi et al.
patent: 5326335 (1994-07-01), Takei

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