Apparatus and method for controlling exposure of a solidifiable medium using a pulsed radiation source in building a three-dimensional object using stereolithography
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United States of America Patent
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Apr 10, 2001
Grant Date -
N/A
app pub date -
May 18, 1999
filing date -
Apr 28, 1997
priority date (Note) -
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Abstract
Methods and apparatus for forming three-dimensional objects from a medium solidifiable when subjected to a beam of pulsed radiation wherein the pulses of radiation are made to occur when the beam is directed to desired pulsing locations on a target surface of the medium. Preferred embodiments of the instant invention include a pulsed laser assembly, including a laser and a pulse generation circuit, a control computer, a plurality of mirrors and mirror encoders. The computer controls the movement of the mirrors which guide the laser beam across the surface of the solidifiable medium. The pulsing of the laser beam is correlated to the position of the mirrors and thus, is not dependent upon time. Pulsing linked to position of beam placement allows controlled and repeatable use of a pulsed beam for the formation of objects.
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