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公开(公告)号：DE355945T1
公开(公告)日：1996-06-27
申请号：DE89303785
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：AU3460995A
公开(公告)日：1996-03-22
申请号：AU3460995
申请日：1995-08-29
Applicant: 3D SYSTEMS INC
Inventor： DICKENS ELMER DOUGLAS JR , LEE BIING LIN , TAYLOR GLENN ALFRED , MAGISTRO ANGELO JOSEPH , NG HENDRA , MCALEA KEVIN P , FORDERHASE PAUL F
IPC: C08L101/00 , B29C35/08 , B29C41/00 , B29C67/00 , B29C67/04 , B29K23/00 , B29K77/00 , C08G69/14 , C08J3/12 , C08J9/24 , C08L23/04 , C08L23/10 , C08L23/26 , C08L59/00 , C08L77/00
Abstract: A laser-sinterable powder product has been prepared having unique properties which allow the powder to be sintered in a selective laser sintering machine to form a sintered part which is near-fully dense. For most purposes, the sintered part is indistinguishable from another part having the same dimensions made by isotropically molding the powder. In addition to being freely flowable at a temperature near its softening temperature, a useful powder is disclosed that has a two-tier distribution in which substantially no primary particles have an average diameter greater than 180 mu m, provided further that the number average ratio of particles smaller than 53 mu m is greater than 80%, the remaining larger particles being in the size range from 53 mu m to 180 mu m. A powder with slow recrystallization rates, as evidenced by non-overlapping endothermic and exothermic peaks in their differential scanning calorimetry characteristics for scan rates of on the order of 10 DEG C. to 20 DEG C. per minute, will also result in sintered parts that are near-fully dense, with minimal dimensional distortion.
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公开(公告)号：AT134333T
公开(公告)日：1996-03-15
申请号：AT90306129
申请日：1990-06-06
Applicant: 3D SYSTEMS INC
Inventor： LEYDEN RICHARD N , LEWIS MARK A , ALMQUIST THOMAS A , NGUYEN HOP D
Abstract: An improved stereolithographic apparatus and method is described. In one embodiment, the improvement comprises immersing at least a portion of a part in a volume of a liquid solvent in a vapor degreaser while subjecting the portion to ultrasonic agitation to substantially remove excess resin. Several examples of solvents are provided, including ethanol, and Freon TMS. In a second embodiment, the improvement comprises building the part on a layer of liquid resin supported by a volume of a dense, immiscible, and UV transparent intermediate liquid, and integratably immersing at least a portion of the built part in the intermediate liquid, and then either subjecting the immersed portion to ultrasonic agitation to substantially remove excess resin, or subjecting the immersed portion to UV light. Several examples of intermediate liquids are provided, including perfluorinated fluids, such as Fluorinert FC-40, and water-based salt solutions, such as solutions of magnesium sulfate or sodium chloride in water.
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公开(公告)号：AU2365595A
公开(公告)日：1995-11-16
申请号：AU2365595
申请日：1995-04-25
Applicant: 3D SYSTEMS INC
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Patent Agency Ranking
公开(公告)号：CA1334052C
公开(公告)日：1995-01-24
申请号：CA596826
申请日：1989-04-17
Applicant: 3D SYSTEMS INC
Inventor： SPENCE STUART T , TARNOFF HARRY L , ALMQUIST THOMAS
IPC: B29C67/00 , G01J1/42 , G03F7/00 , G03F7/20 , G06T17/00 , G06T17/10 , G06T17/20 , B32B1/10 , G01B11/14 , G01J1/00 , G03C9/08
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.
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公开(公告)号：AU5252493A
公开(公告)日：1994-06-30
申请号：AU5252493
申请日：1993-12-20
Applicant: 3D SYSTEMS INC
Inventor： STEINMANN BETTINA , WOLF JEAN-PIERRE , SCHULTHESS ADRIAN , HUNZIKER MAX
IPC: C08G59/18 , C08F283/00 , C08F283/10 , C08G59/00 , C08G59/14 , C08G59/40 , C08G59/62 , C08G59/68 , C08L63/00 , G03F7/00 , G03F7/027 , G03F7/029 , G03F7/038 , C08L63/10 , C08L67/00 , C08L67/04 , C08L71/00 , C08L75/04
Abstract: The invention relates to photosensitive compositions containing A) 40-80% by weight of at least one liquid epoxy resin having an epoxide functionality equal to or greater than 2, B) 0.1-10% by weight of at least one cationic photoinitiator for component A), C) 5-40% by weight of at least one liquid cycloaliphatic or aromatic diacrylate, D) 0-15% by weight of at least one liquid poly(meth)acrylate having a (meth)acrylate functionality greater than 2, the content of component D) in the total (meth)acrylate content being at most 50% by weight, E) 0.1-10% by weight of at least one free-radical photoinitiator for the components C) and, if present, D) and F) 5-40% by weight of at least one OH-terminated polyether, polyester or polyurethane, which compositions are particularly suitable, for example, for producing photopolymerised layers, especially of three-dimensional objects.
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公开(公告)号：DE3587656T2
公开(公告)日：1994-04-28
申请号：DE3587656
申请日：1985-08-06
Applicant: 3D SYSTEMS INC
Inventor： HULL CHARLES W
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130.发明专利
公开(公告)号：CA2075985A1
公开(公告)日：1991-08-22
申请号：CA2075985
申请日：1991-02-15
Applicant: 3D SYSTEMS INC
Inventor： HELLER TIMMY BOYD , HILL RAY MCGAFFEY , SAGGAL ABDALLA F
IPC: G03F7/20 , B29C64/124 , B29C67/00
Abstract: 2075985 9112120 PCTABS00006 A method and apparatus (20) for forming a solid three-dimensional article by exposure of successive layers of a liquid material to a vertically movable energy source (32). The apparatus includes a fixed support plate (28) disposed in a container (24), the liquid being dispensed to successively higher levels in the container above the plate. In one embodiment, the liquid is fed from a reservoir (25) below the plate to an upper portion of the container above the plate by an expandable member (150) disposed in the reservoir. A vertically movable liquid dispenser (34) may be provided above the plate either alone or in combination with the expandable member. The energy source includes a laser (50), a focusing optics system (52) and a scanner head (54) for directing a laser beam to solidify selected portions of successive layers of the liquid medium.
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