Surface smoothing of stereolithographically formed 3-D objects
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United States of America Patent
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-
May 25, 2004
Grant Date -
Jan 2, 2003
app pub date -
Aug 29, 2002
filing date -
Aug 8, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A stereolithographic method and apparatus for forming polymeric structures comprising a plurality of overlying layers, each layer formed by polymerizing a thin layer of liquid photopolymer on a prior layer. Crevices formed at the layer interfaces are filled by a stereolithographic method comprising lifting the multilayered structure from the liquid photopolymer, draining excess liquid therefrom, tilting the structure to provide an acute angle of incidence between an incident radiation beam and a side wall of the object, and applying radiation to the crevice to polymerize at least the surface of a quantity of liquid photopolymer therein. The structure may then be subjected to a separate final full cure to fully harden the structure. An exemplary use is the packaging of electronic components and the like.
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