Layer thickness control for stereolithography utilizing...

Plastic and nonmetallic article shaping or treating: processes – Stereolithographic shaping from liquid precursor

Reexamination Certificate

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C264S272130, C264S272170

Reexamination Certificate

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06896837

ABSTRACT:
An apparatus and method for controlling the surface level of a liquid residing within a relatively vertically stationary workpiece support platform disposed within a reservoir for use in stereolithographic processes wherein a layered object or structure is formed by selectively curing portions of the liquid to at least a semisolid state in multiple, at least partially superimposed layers. Providing precise control of liquid depth over the vertically stationary platform as well as focusing of a laser beam for curing the liquid at the varying surface levels thereof relative to the vertically stationary platform is effected using a laser range finder system controlled by a computer used to control the stereolithographic process in a closed loop fashion.

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