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    46.
    发明专利
    未知

    公开(公告)号：ES2082782T3

    公开(公告)日：1996-04-01

    申请号：ES89309762

    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

    IPC: B29C35/08 ,  B29C41/12 ,  B29C67/00 ,  B29K105/24 ,  G01F23/292 ,  G01F23/36 ,  G05D9/12 ,  B29C39/42

    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.

    48.
    发明专利
    未知

    公开(公告)号：AT456075T

    公开(公告)日：2010-02-15

    申请号：AT06251473

    申请日：2006-03-20

    Applicant: 3D SYSTEMS INC

    Inventor： HULL CHARLES W ,  PARTANEN JOUNI P ,  SPERRY CHARLES R ,  DUNNE PATRICK ,  SCOTT SUZANNE M ,  MCNAMARA DENNIS F ,  MANNERS CHRIS R

    IPC: G03F7/00 ,  B29C67/00 ,  G03F7/20

    Abstract: A solid imaging method employing sub-pixel shifting in multiple exposures of the digitally light projected image of a cross-section of a three-dimensional object on a solidifiable liquid medium. The multiple exposures provide increased resolution, preserving image features in a three-dimensional object and smoothing out rough or uneven edges that would otherwise occur using digital light projectors that are limited by the number of pixels in an image projected over the size of the image. Algorithms are used to select pixels to be illuminated within the boundary of each image projected in the cross-section being exposed.

    50.
    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.

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