Plastic and nonmetallic article shaping or treating: processes – Stereolithographic shaping from liquid precursor
Reexamination Certificate
2008-10-20
2011-11-01
Del Sole, Joseph (Department: 1743)
Plastic and nonmetallic article shaping or treating: processes
Stereolithographic shaping from liquid precursor
C264S308000, C425S174400
Reexamination Certificate
active
08048359
ABSTRACT:
There is provided methods and apparatus for compensation of intensity profiles of imagers used in three-dimensional modelers. The intensity profile of the actinic radiation projected from the imager is determined by a variety of techniques, including but not limited to manually operated sensors, exposed and scanned actinic radiation-sensitive paper, and intensity profilers. Once the intensity profile of the imager is determined, each layer of the solidifiable liquid material is cured by projecting a plurality of patterns (as opposed to a single pattern) defining the two-dimensional cross-section of the part being cured. The patterns vary in duration, number, and/or shape to correlate to the intensity profile so that a single layer of selectively cured solidifiable liquid material is cured with a substantially equivalent (or otherwise controlled) amount of actinic radiation per unit of surface area to provide generally controlled and consistent part quality.
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Gregory, II Richard Ora
Hull Charles W.
Kerekes Thomas Alan
Kuek Soon-Chun
Wang Hongqing V.
3-D Systems, Inc.
Del Sole Joseph
Roberson Keith A.
Sanders James
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