Precision pen height control for micro-scale direct writing technology
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United States of America Patent
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Apr 30, 2013
Grant Date -
Dec 17, 2009
app pub date -
Jun 11, 2008
filing date -
Jun 11, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus for precision pen height control which includes a dispensing member, a fluid dispensing system, a vertical position sensing system, and a vertical position controller. The fluid dispensing system is in fluid communication with an opening in the dispensing member via a tubular member. A vertical position sensing system, which includes a diffraction grating and a sensor, is engaged to the tubular member. The sensor is positioned adjacent the diffraction grating. The diffraction grating is engaged to a vertical support, which is engaged to the tubular member. The sensor produces a vertical position signal based upon the position of the vertical support. The vertical position controller is engaged to the vertical position sensing system, and receives a control signal generated from the vertical position signal. The vertical position controller produces and applies vertical forces to the vertical support in response to the control signal.
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