H - Electricity – 01 – L
Patent
H - Electricity
01
L
H01L 21/31 (2006.01) B29C 35/08 (2006.01) B29C 41/22 (2006.01) B29C 67/00 (2006.01) B29C 71/00 (2006.01) H01L 21/469 (2006.01) B29C 71/04 (2006.01)
Patent
CA 2056416
2056416 9015674 PCTABS00003 An improved stereolithographic apparatus and method is described. In one embodiment, the improvement comprises immersing at least a portion of a part (109) in a volume of a liquid solvent in a vapor degreaser while subjecting the portion to ultrasonic agitation to substantially remove excess resin (111). Several examples of solvents are provided, including ethanol, and Freon TMS. In a second embodiment, the improvement comprises building the part (109) on a layer of liquid resin (103) supported by a volume of a dense, immiscible, and UV transparent intermediate liquid, and integratably immersing at least a portion of the built part (109) in the intermediate liquid, and then either subjecting the immersed portion to ultrasonic agitation to substantially remove excess resin (111), or subjecting the immersed portion to UV light. Several examples of intermediate liquids are provided, including perfluorinated fluids, such as Fluorinert FC-40, and water-based salt solutions, such as solutions of magnesium sulfate or sodium chloride in water.
Almquist Thomas A.
Lewis Mark A.
Leyden Richard N.
Nguyen Hop D.
3d Systems Inc.
Smart & Biggar
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