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    51.
    发明专利
    未知

    公开(公告)号：DE69623489D1

    公开(公告)日：2002-10-10

    申请号：DE69623489

    申请日：1996-09-27

    Applicant: 3D SYSTEMS INC

    Inventor： LEYDEN N ,  THAYER S ,  BEDAL J ,  ALMQUIST A ,  HULL W ,  EARL M ,  KEREKES A ,  SMALLEY R ,  MEROT M ,  FEDCHENKO P ,  LOCKARD S ,  PANG H ,  THAT TON

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

    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.

    STEREOLITHOGRAPHIC BEAM PROFILING
    54.
    发明专利
    STEREOLITHOGRAPHIC BEAM PROFILING 未知

    公开(公告)号：CA1341214C

    公开(公告)日：2001-04-10

    申请号：CA617113

    申请日：1989-04-17

    Applicant: 3D SYSTEMS INC

    Inventor： TARNOFF HARRY L ,  SPENCE STUART THOMAS

    IPC: B29C67/00 ,  G01J1/42 ,  G03F7/00 ,  G03F7/20 ,  G06T17/00 ,  G06T17/10 ,  G06T17/20 ,  B29C69/00 ,  G05D3/00

    Abstract: An apparatus and a method for profiling the intensity of a beam and thus measuring the overall intensity and power of a beam are disclosed that have particular use in stereolithography. A beam sensor comprising a pinhole in a plate and a photodetector behind the pinhole measures the intensity of portions of a beam as the beam is moved over the beam sensor. Software associated with the sensors in a computer controls the scanning mechanism for the beam so that the beam is shifted to find the pinhole and move across it in order to develop the intensity profile. The invention can be used to detect drift in the scanning mechanism, determine the focus of the beam, and predict the depth and width of photopolymer cured by the beam. A related apparatus and method for calibrating and normalizing a stereolithographic apparatus is described, and a related apparatus and method for correcting for drift in production of objects by stereolithography, is also described.

    STEREOLITHOGRAPHIC CURL REDUCTION
    55.
    发明专利
    STEREOLITHOGRAPHIC CURL REDUCTION 未知

    公开(公告)号：CA1340890C

    公开(公告)日：2000-02-01

    申请号：CA617087

    申请日：1989-04-17

    Applicant: 3D SYSTEMS INC

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

    IPC: G03F7/20

    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.

    Apparatus and methods for fabricating molded refractory articles
    56.
    发明专利
    Apparatus and methods for fabricating molded refractory articles 未知

    公开(公告)号：AU4955699A

    公开(公告)日：1999-12-30

    申请号：AU4955699

    申请日：1999-06-11

    Applicant: 3D SYSTEMS INC

    Inventor： LOCKARD MICHAEL F ,  SCHMIDT KRIS ,  HULL CHARLES W

    IPC: B22F3/00 ,  B22F3/10 ,  B22F3/12 ,  B22F3/105

    Abstract: A method for making a molded refractory article including the steps of providing a mold including a master pattern, the mold and master pattern defining a mold cavity; filling the mold cavity with a mixture comprising refractory particles and a heat fugitive binder; placing the assembly of the mold, master pattern and mixture in a furnace; curing the mixture; separating the mold and master pattern from the cured mixture; removing the binder to form a porous structure, sintering the porous structure to provide a porous refractory article and infiltrating the porous refractory article with a filler metal.

    Reduced stereolithographic part distortion through isolation
    58.
    发明专利
    Reduced stereolithographic part distortion through isolation 未知

    公开(公告)号：HK1001677A1

    公开(公告)日：1998-07-03

    申请号：HK98100632

    申请日：1998-01-23

    Applicant: 3D SYSTEMS INC

    Inventor： SMALLEY DENNIS ROLLETTE

    IPC: B29C35/08 ,  B29C67/00 ,  B29K105/24 ,  B29C

    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.

    Stereolithographic curl reduction
    59.
    发明专利
    Stereolithographic curl reduction 未知

    公开(公告)号：HK1001675A1

    公开(公告)日：1998-07-03

    申请号：HK98100600

    申请日：1998-01-22

    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 ,  B29C

    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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