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    151.
    发明专利
    未知

    公开(公告)号：DE60021440D1

    公开(公告)日：2005-09-01

    申请号：DE60021440

    申请日：2000-02-08

    Applicant: 3D SYSTEMS INC

    Inventor： GUERTIN D MICHELLE ,  HULL CHARLES W ,  NGUYEN HOP D

    IPC: B29C67/00 ,  B29C35/02 ,  B29C35/08 ,  B29C41/02 ,  G05B19/4099 ,  G06F17/50 ,  G06F19/00

    Abstract: A rapid prototyping and manufacturing (e.g. stereolithography) method and apparatus for making three-dimensional objects on a layer-by-layer basis by selectively exposing layers of material to prescribed synergistic stimulation including forming portions of a lamina using a first exposure (52), allowing a time delay (54), and then applying a second exposure (56). The time delay is sufficient to allow shrinkage of the material to occur that results from the first exposure. It is preferred that the solidified portion resulting from the first exposure does not adhere to the previously formed lamina. It is also preferred that the portion solidified by this first exposure does not adhere to any boundary region that may have been exposed and adhered to the previously formed lamina. The time delay associated with a given cross-sectional region may be occupied by exposing other cross-sectional regions. The delay may occur between two exposures of overlaying hatch or fill vectors. The delay may alternatively occur between exposure of hatch vectors and boundary vectors. The time delay may be determined by a clock, or alternatively, the time delay may be considered to have lapsed upon certain physical conditions being met, such as detecting the amount of shrinkage and determining that it has progressed far enough for the second exposure to occur.

    154.
    发明专利
    未知

    公开(公告)号：DE60000946T2

    公开(公告)日：2003-10-02

    申请号：DE60000946

    申请日：2000-02-22

    Applicant: 3D SYSTEMS INC

    Inventor： BUI LOC V ,  DOAN VU ,  KWO KELLY

    IPC: B29C41/00 ,  B29C67/00 ,  B29K77/00 ,  B29K91/00 ,  C08K5/103 ,  C08K5/12 ,  C08K5/20 ,  C08L23/16 ,  C08L77/06 ,  C08L91/06 ,  C08L93/04 ,  C09D11/00

    Abstract: Phase change compositions that are solid at ambient temperature and liquid at an elevated temperature above ambient temperature are disclosed for advantageous use in selective deposition modeling methods for building three-dimensional objects. A phase change composition according to the disclosed invention is a semi-crystalline component mixture having a freezing point of at least about 68 DEG C., a melting point of at least about 88 DEG C. and a viscosity of about 13 centipoise at 135 DEG C. The composition includes a plurality of waxes having a broad melting point range and molecular weight range. Three-dimensional objects having minimal curl, delamination and stress cracks can be produced at a faster rate than heretofore known by using selective deposition modeling techniques employing the disclosed composition.

    156.
    发明专利
    未知

    公开(公告)号：FR2828422A1

    公开(公告)日：2003-02-14

    申请号：FR0209500

    申请日：2002-07-26

    Applicant: 3D SYSTEMS INC

    Inventor： DARRAH JAMES F ,  XU XIAOSHU

    IPC: B22F3/105 ,  B29C67/00 ,  G05B19/4099 ,  B23K26/08 ,  B23K26/34 ,  B29C67/04 ,  B22F7/02

    Abstract: A computer-controlled apparatus and method for fabricating three-dimensional articles in layerwise fashion is disclosed. Upon dispensing a layer of a fusible powder, a laser irradiates selected locations of that layer to fuse the powder into a cross-section of the article to be formed in that layer, such that the fused cross-sections fuse together into the article. The laser is controlled in a raster scan fashion across the selected locations of the powder layer. The raster scan lines are defined, for each cross-section, to achieve an optimal fill scan time. The optimal fill scan time is determined, by the computer estimating the fill scan time by rotating the cross-section over a plurality of rotational angles, and estimating the fill scan time for each of the rotated cross-sections for at least a sample of the fill scans necessary to form the article. The actual fill scan vectors to be used in selective laser sintering of the article are rotated, from a coordinate axis at the target plane, according to the rotation of the cross-section providing the lowest estimated fill scan time.

    Fabricating a three-dimensional article from powder
    157.
    发明专利
    Fabricating a three-dimensional article from powder 未知

    公开(公告)号：GB2378150A

    公开(公告)日：2003-02-05

    申请号：GB0118650

    申请日：2001-07-31

    Applicant: DTM CORP ,  3D SYSTEMS INC

    Inventor： DARRAH JAMES F ,  XU XIAOSHU

    IPC: B22F3/105 ,  B29C67/00 ,  G05B19/4099 ,  G05B19/409

    Abstract: A computer-controlled apparatus and method for fabricating three-dimensional articles in layerwise fashion is disclosed. Upon dispensing a layer of a fusible powder, a laser 110 irradiates selected locations of that layer on a target surface 104 to fuse the powder into a cross-section of the article to be formed in that layer, such that the cross-sections fuse together into the article. The laser 110 is controlled in a raster scan fashion across the selected locations of the powder layer. The raster scan lines are defined, for each cross-section, to achieve an optimal fill scan time. The optimal fill scan time is determined, by the computer 140 estimating the fill scan time by rotating the cross-section over a plurality of rotational angles, and estimating the fill scan time for each of the rotated cross-sections for at least a sample of the fill scans necessary to form the article. The actual fill scan vectors to be used in selective laser sintering of the article are rotated, from a coordinate axis at the target plane, according to the rotation of the cross-section providing the lowest estimated fill scan time.

    159.
    发明专利
    未知

    公开(公告)号：DE68929366T2

    公开(公告)日：2002-09-26

    申请号：DE68929366

    申请日：1989-09-26

    Applicant: 3D SYSTEMS INC

    Inventor： ALMQUIST THOMAS A ,  HULL CHARLES W ,  MODREK BORZO ,  SERKUCZEWSKI ANDRZEJ R ,  JACOBS PAUL F ,  LEWIS CHARLES W ,  LEWIS MARK A ,  LIRAN ABRAHAM

    IPC: B29C35/08 ,  B29C41/12 ,  B29C67/00 ,  B29K105/24 ,  G01F23/292 ,  G01F23/36 ,  G05D9/12 ,  G01F23/28

    Abstract: A stereolithography method and system for producing three-dimensional plastic objects by forming a plurality of thin layers of partially cured plastic material which are thin cross sections of the desired object. A layer of polymerizable resin is applied to a support surface and the excess is struck off, such as with a doctor blade, to form a smoothed layer. The smoothed layer is subjected to radiation in a predetermined pattern to form the cross-sectional layer into the desired shape. A plurality of layers are subsequently applied, leveled, then cured in the same manner to produce the desired three-dimensional object. Apparatus for measuring the level of the surface of a fluid is also provided. Variations in the level of fluid will be detected and may be used to drive a pump, diaphragm, or plunger in order to maintain the level of the fluid.

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