Positioner with long travel in two dimensions

Patent · Tue Dec 23 00:00:00 EST 1997

OSTI ID:871283

Trumper, David L ^[1]; Williams, Mark E ^[2]

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1. Plaistow, NH
2. Pelham, NH

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.

• Research Organization: Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
• DOE Contract Number: AJ4723
• Assignee: Massachusetts Institute of Technology (Cambridge, MA)
• Patent Number(s): US 5699621
• Application Number: 08/604,733
• OSTI ID: 871283
• Country of Publication: United States
• Language: English

Related Subjects

positioner
travel
dimensions
precision
positioning
provided
provides
linear
non-contact
bearings
subassembly
dimension
upper
preferably
magnetic
addition
providing
compensates
positions
rotary
third
air
bearing
normally
provide
angled
surfaces
capacitive
gap
sensing
probes
mounted
stage
ground
flush
actuators
precise
measurements
air bearing
magnetic bearings
magnetic bearing
sensing probe
linear dimension
linear dimensions
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