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公开(公告)号：AT154778T
公开(公告)日：1997-07-15
申请号：AT89303782
申请日：1989-04-17
Applicant: 3D SYSTEMS INC
Inventor： HULL CHARLES WILLIAM , SPENCE STUART THOMAS , ALBERT DAVID J , SMALLEY DENNIS ROLLETTE , HARLOW RICHARD A , STEINBURGH PHILIP , TARNOFF HARRY L , NGUYEN HOP D , LEWIS CHARLES WILLIAM , VORGITCH TOM J , REMBA DAVID Z
IPC: B29C35/08 , B29C67/00 , B29K105/24 , G01J1/42 , G03C9/08 , G03F7/00 , G03F7/20 , G06F17/50 , G06T17/00 , G06T17/10 , G06T17/20 , B29C39/42 , G03C9/00
Abstract: An improved stereolithography system for generating a three-dimensional object by creating a cross-sectional pattern of the object to be formed at a selected surface of a fluid medium capable of altering its physical state in response to appropriate synergistic stimulation by impinging radiation, particle bombardment or chemical reaction, information defining the object being specially processed to reduce curl and distortion, and increase resolution, strength, accuracy, speed and economy of reproduction even for rather difficult object shapes, the successive adjacent laminae, representing corresponding successive adjacent cross-sections of the object, being automatically formed and integrated together to provide a step-wise laminar buildup of the desired object, whereby a three-dimensional object is formed and drawn from a substantially planar surface of the fluid medium during the forming process. The conversion of CAD/CAM data descriptive of the object into stereolithographic data used to trace cross-sections of the object is described.
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公开(公告)号：AT154541T
公开(公告)日：1997-07-15
申请号：AT89303785
申请日：1989-04-17
Applicant: 3D SYSTEMS INC
Inventor： SMALLEY DENNIS ROLLETTE
Abstract: An improved stereolithography system for generating a three-dimensional object by creating a cross-sectional pattern of the object to be formed at a selected surface of a fluid medium capable of altering its physical state in response to appropriate synergistic stimulation by impinging radiation, particle bombardment or chemical reaction, using information defining the object which is specially processed to reduce curl, stress, birdnesting and other distortions, the successive adjacent laminae, representing corresponding successive adjacent cross-sections of the object, being automatically formed and integrated together to provide a step-wise laminar buildup of the desired object, whereby a three-dimensional object is formed and drawn from a substantially planar surface of the fluid medium during the forming process. Reducing stereolithographic distortion through isolation of stress is described.
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公开(公告)号：DE362982T1
公开(公告)日：1996-06-27
申请号：DE89303778
申请日：1989-04-17
Applicant: 3D SYSTEMS INC
Inventor： HULL CHARLES WILLIAM , LEWIS CHARLES WILLIAM VAN , FREED RAYMOND SAMUEL , SPENCE STUART THOMAS , VINSON WAYNE ALLAN , SMALLEY DENNIS ROLLETTE
Abstract: An improved stereolithography system for generating a three-dimensional object by creating a cross-sectional pattern of the object to be formed at a selected surface of a fluid medium capable of altering its physical state in response to appropriate synergistic stimulation by impinging radiation, particle bombardment or chemical reaction, information defining the object being structurally specified to reduce curl, stress and distortion in the ultimately formed object, the successive adjacent laminae, representing corresponding successive adjacent cross-sections of the object, being automatically formed and integrated together to provide a step-wise laminar buildup of the desired object, whereby a three-dimensional object is formed and drawn from a substantially planar surface of the fluid medium during the forming process. A stereolithographic distortion known as curl is defined, and several techniques to eliminate or reduce curl are described, including dashed line, bent line, secondary structure, rivets, and multi-pass techniques. In addition, a quantitative measurement of curl known as the curl factor, and a test part known as a quarter cylinder are described, which together can be used to measure the effectiveness of the above techniques in reducing curl.
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