High precision cartesian robot for a planar scanner
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United States of America Patent
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Apr 8, 2003
Issued Date -
N/A
app pub date -
Jun 4, 2001
filing date -
Jun 4, 2001
priority date (Note) -
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Abstract
A Cartesian robot comprises a base member disposed along an x-axis, a transverse member moveably mounted to the base member, and disposed along a y-axis transverse to the x-axis. The robot has a y-carriage for a measurement probe moveably mounted to the transverse member along the y-axis. The x, y, and z axes define a Cartesian coordinate system. The robot includes an innovative structure that achieves high precision with respect to the z-axis by providing a planarized and stable reference surface along the y-axis (vertical axis). The position of the y-carriage with respect to a z-axis is a predictable function of the measured position of the y-carriage on the reference surface, and rigid-body tilt of the reference surface. High accuracy and precision are achieved by utilizing a granite slab for providing the planarized reference surface disposed along the y-axis for the transverse member. The granite slab is supported by a structural frame, and a measurement probe may be mounted to a y-carriage which is moveably mounted to the reference surface of the granite slab. The Cartesian robot is especially suitable for near-field antenna-measuring scanners that require high precision, such as scanners for high-frequency antenna.
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