Machine Design

Tight-fitting fabs no problem for controllerina-stage

A stage with controller electronics nestled inside was a key in fielding a metrology station compact enough to fit in a small footprint.

An Agile Systems MAX 3000 (top) powers Nanometrics metrology stations (above).


Integrated metrology systems by Nanometrics Inc. had to scan 300-mm wafers quickly to look for defects in films, but could only take up a minimum of space in clean rooms. A MAX 3000 controller from Agile Systems was a natural candidate for controlling the motion of wafer scanning electronics because it fit in a space 3 5 2 in. It took the place of an external box the size of a large PC chassis that was used in previous generations. For the Nanometrics controller Agile devised a special daughterboard which carried extra I/O and sin/cos high-resolution encoders to work with the direct-drive stage. The motors can completely spin a 300-mm wafer in 400 msec and make a 7-in. move in 400-msec hitting a top speed of 21 ips with submicron accuracy. The only external cables to the controller are a power cable and a FireWire connection which also carries machine vision video.

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Agile Systems, Ontario, Canada,
agile-systems.com
Nanometrics Inc., Milpitas, Calif., nanometrics.com

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