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    Method of and apparatus for deriving data intermediate to cross-sectional data descriptive of a three-dimensional object
    171.
    发明专利
    Method of and apparatus for deriving data intermediate to cross-sectional data descriptive of a three-dimensional object 未知

    公开(公告)号：AU7380798A

    公开(公告)日：1998-12-08

    申请号：AU7380798

    申请日：1998-05-12

    Applicant: 3D SYSTEMS INC

    Inventor： NGUYEN HOP D ,  SMALLEY DENNIS R

    IPC: B29C67/00

    Abstract: A rapid prototyping and manufacturing apparatus and method (e.g. stereolithographic apparatus and a method) for layer-by-layer formation of a three-dimensional object represented by cross-sectional data including a method and apparatus for deriving data for at least a portion of a region intermediate to two successive cross-sections of data for use in forming the three-dimensional object with improved surface resolution. Outward-facing regions on two or more successive cross-sectional layers of the object are compared to determine whether the outward-facing region(s) associated with one of the layers represents what was originally intended to be a smooth transitional region (i.e. a sloping region) between two cross-sections or a discontinuous region (i.e. vertical transitional region) between two cross-sections. The comparison may involve utilization of common boundaries between outward facing regions on the cross-sections. The comparison may further involve the utilization of widths of the outward-facing regions on adjacent cross-sections.

    Method and apparatus for data manipulation and system control in a selective deposition modeling system
    177.
    发明专利
    Method and apparatus for data manipulation and system control in a selective deposition modeling system 未知

    公开(公告)号：AU7376696A

    公开(公告)日：1997-04-17

    申请号：AU7376696

    申请日：1996-09-27

    Applicant: 3D SYSTEMS INC

    Inventor： EARL JOCELYN M ,  MANNERS CHRIS R ,  KEREKES THOMAS A ,  MARYGOLD PAUL H ,  THAYER JEFFREY S

    IPC: B22F3/00 ,  B29C35/08 ,  B29C41/12 ,  B29C41/36 ,  B29C67/00 ,  B29K63/00 ,  G06T17/00 ,  G06K15/10

    Abstract: A three-dimensional object is formed by selectively depositing successive layers (14) of build material from a print-head (9) having a plurality of orifices or nozzles (10(1)-10(96)), such as an ink-jet type of print-head. The print-head (9) is moved (X-Y control) relative to a support platform (15) in a series of scans in the X-direction offset from one another in the Y-direction and possibly overlapping. The orifices (10(1)-10(96)) extend transversely of the scan X-direction and may be set at an angle (α) to it to control the resolution perpendicular to the scan direction. The platform (15) is movable relative to the print-head in the Z-direction for forming each successive layer (14). The build material is a flowable material and may be a radiation-curable material, such as an ultra-violet curable photo-polymer. The data according to which each layer is formed may be manipulated according to a selected build style to determine the selective activation of the print-head orifices.

    178.
    发明专利
    未知

    公开(公告)号：AT150693T

    公开(公告)日：1997-04-15

    申请号：AT89303778

    申请日：1989-04-17

    Applicant: 3D SYSTEMS INC

    Inventor： HULL CHARLES WILLIAM ,  LEWIS CHARLES WILLIAM ,  FREED RAYMOND SAMUEL ,  SPENCE STUART THOMAS ,  VINSON WAYNE ALLAN ,  SMALLEY DENNIS ROLLETTE

    IPC: B29C35/08 ,  B29C67/00 ,  B29K105/24 ,  B44B1/00 ,  G03F7/00 ,  G03F7/20 ,  G06F17/50 ,  B29C39/42

    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.

    REDUCING STEREOLITHOGRAPHIC PART DISTORTION THROUGH ISOLATION OF STRESS
    180.
    发明专利
    REDUCING STEREOLITHOGRAPHIC PART DISTORTION THROUGH ISOLATION OF STRESS 未知

    公开(公告)号：CA1338628C

    公开(公告)日：1996-10-01

    申请号：CA596850

    申请日：1989-04-17

    Applicant: 3D SYSTEMS INC

    Inventor： SMALLEY DENNIS ROLLETTE

    IPC: B29C35/08 ,  B29C67/00 ,  B29K105/24 ,  G05B15/02

    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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