Method of and apparatus for measuring and controlling fluid level in stereolithography
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United States of America Patent
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Nov 2, 1993
Issued Date -
N/A
app pub date -
May 6, 1992
filing date -
Sep 26, 1988
priority date (Note) -
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Abstract
Improved apparatus and methods for forming a layer of material over a surface of a previously-formed cross-section of a three-dimensional object in anticipation of forming a next cross-section of the object out of the layer. A volume of material, including at least some excess material, is placed over the surface, and the excess material is swept off by placing the excess material in the predetermined path of a sweeping member, the path being substantially in a plane spaced from a working surface of material. The member may be directed to sweep the excess material away through a successive number of sweeps, which may vary for each cross-section, at least a velocity which may vary for each sweep. Additionally, the clearance between the member and the surface of the previous cross-section may vary for each sweep. A 'winged' member is also provided, comprising two legs extending from a base, and a 'Trident' embodiment is also provided, comprising three legs extending from a base.
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