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Stereolithography using repeated exposures to increase strength and reduce distortion

  • US 4,945,032 A
  • Filed: 10/31/1989
  • Issued: 07/31/1990
  • Est. Priority Date: 03/31/1988
  • Status: Expired due to Fees
First Claim
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1. In a method for the formation of a thin walled three-dimensional object in a reservoir of liquid ultraviolet-curable ethylenically unsaturated material and in which a support is positioned immediately beneath the upper surface of the liquid reservoir with said upper surface being exposed to ultraviolet light in a pattern of line exposures to solidify the liquid at and near said upper surface in a series of cross-sections of the desired three-dimensional object, one atop the other, and thus form a series of superposed layers which adhere to one another to build said three-dimensional object within the liquid reservoir, the improvement comprising, stopping the line exposure at any portion of the surface in the formation of said series of superposed layers and then repeating the line exposure at least once again in the production of each said superposed layer so that the strength and solvent resistance of the formed object are increased and its distortion is minimized.

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