Alignment system and method
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United States of America Patent
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May 26, 2020
Grant Date -
Aug 15, 2019
app pub date -
Nov 10, 2016
filing date -
Nov 11, 2015
priority date (Note) -
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Abstract
An alignment system (100) and method for positioning and/or keeping a first object (1) at a controlled distanced (D1) with respect to a second object (2). An object stage (11) is configured to hold a surface (1a) of the first object (1) at a distance (D1) over a surface (2a) of the second object (2). A sensor device (31) comprising a probe tip (31a) is connected at a predetermined probe level distance (Dp) relative to the surface (1a) of the first object (1). The probe tip (31a) is configured to perform an atomic force measurement (AFM) of a force (F1) exerted via the probe tip (31a) on a surface (2a) of the second object (2). A controller (80) is configured to control an object stage actuator (21) as a function of the probe level distance (Dp) and the measured force (F1) to maintain the controlled distanced (D1).
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