Process for the production of a three-dimensional object with an improved separation of hardened material layers from a construction plane
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United States of America Patent
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Mar 12, 2013
Grant Date -
Mar 17, 2011
app pub date -
Nov 1, 2010
filing date -
May 7, 2004
priority date (Note) -
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Abstract
The invention relates to a process or a device for the production of a three-dimensional object by layer-wise solidification of a photo-polymerizable resin by means of a planar or essentially planar construction/reference plane, at which the photo-polymerizable resin contained in the liquid material is to be hardened by electromagnetic irradiation, and wherein the material application for the subsequent layer automatically results from the separation of the last hardened layer from the construction/-reference plane, whereby the construction/reference plane is formed by an elastic film. The film is fixed in a frame, and the height position of the frame with the film is adjusted in a basin containing the liquid material such that the pressure of the liquid material compensates the sagging of the film (formation of a negative meniscus), and that the lower side of the film is permanently in contact with the material during the whole construction process.
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