Optical measurement apparatus

Details Optical measurement apparatus Optical measurement apparatus

2006-09-26

2006-09-26

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C250S559300, C414S935000

Reexamination Certificate

active

07112812

ABSTRACT:
An apparatus, system and method for measuring a feature of a three-dimensional object, such as a wafer carrier, are provided. The apparatus is for use with an optical scanner and comprises a mounting structure adapted to be disposed on the scanner. The mounting structure has a calibration mark adapted to be read by the scanner and is adapted to position the object so that it is at a first pre-determined distance from the calibration mark. In one aspect of the present invention, the mounting structure further comprises an alignment surface adapted to abut the object. The alignment surface is disposed at a second pre-determined distance from the calibration mark. In another aspect of the present invention, the alignment surface is adapted to abut the object at a point spaced apart from the scanning surface.

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PCT/US02/40503 International Search Report issued Jun. 10, 2003.

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