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Apparatus and method for producing an object using stereolithography

  • US 5,904,889 A
  • Filed: 12/23/1996
  • Issued: 05/18/1999
  • Est. Priority Date: 04/25/1995
  • Status: Expired due to Fees
First Claim
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1. A stereolithographic apparatus for producing a three-dimensional object, said apparatus comprising:

  • a tank for receiving a bath of a liquid or powdery material suitable for solidification using electromagnetic radiation, said bath having a bath surface;

    a relatively moveable support for positioning said object in said bath relative to said bath surface so as to form a layer of said material adjacent to said bath surface;

    a solidification device for solidifying said layer by directing electromagnetic radiation thereto;

    a coating device for supplying said material to said bath, said coating device having a bottom side arranged above said bath surface in an operational position;

    an adjustable discharge opening including a gap which is provided in and extends along said bottom side, said gap having a gap width, and including a spacing device for adjusting said gap width;

    a channel formed within said coating device and communicating with said discharge opening; and

    a pump communicating with said channel through a conduit for supplying said material to said adjustable discharge opening.

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