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Apparatus and related method for forming a substantially flat stereolithographic working surface

  • US 5,447,822 A
  • Filed: 04/20/1994
  • Issued: 09/05/1995
  • Est. Priority Date: 09/28/1989
  • Status: Expired due to Fees
First Claim
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1. An improved method for stereolithographically forming a three-dimensional object from a curable resin which is transformable upon exposure to solidifying radiation, comprising the steps of successively forming layers of said curable resin at a desired working surface in preparation for forming layers of said three-dimensional object, successively transforming said layers of curable resin by selectively exposing said layers of curable resin to solidifying radiation to form said layers of said three-dimensional object, and repeating said steps of forming and transforming so as to buildup the three-dimensional object from a plurality of adhered layers, the improvement comprising the steps of:

  • covering at least a portion of the curable resin with a film, having a thickness, located at the working surface;

    retracting the film from the working surface, without translation of the film along the plane of the working surface, by peeling the film from the working surface;

    exposing the curable resin at the working surface to solidifying radiation in a pattern to form a layer of the three-dimensional object; and

    repeating the covering, retracting and exposing steps a plurality of times to form a plurality of layers of the three-dimensional object.

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