Process for the production of a three-dimensional object with resolution improvement by “pixel shift”

摘要

The invention relates to a process or device for the production of a three-dimensional object by layer-wise solidification of a material which is solidifiable under the application of electromagnetic irradiation by means of mask illumination, wherein the mask is produced using an image forming unit having a prescribed resolution, which is formed from a constant number of image forming elements (pixels) being discrete and being arranged in a spatially mutually fixed manner. For the improvement of the resolution along the outer and inner contours of the sectional areas of the object to be generated layer-wise in the sub-pixel range, a multiple illumination per layer is performed, which consists of a series of multiple images that are mutually shifted in the sub-pixel range in the image/construction plane, wherein a separate mask/bitmap is produced for each shifted image.

主权项

1. A device for producing a three-dimensional object from a solidifiable material, comprising:
an image forming unit comprising a number of image forming elements arranged in a two-dimensional matrix, wherein during an object building operation,
each image forming element projects a first solidification energy onto a surface of the solidifiable material, thereby projecting a first set of pixels on the surface of the solidifiable material, the first set of pixels defining an image pattern at a first position and each pixel in the first set of pixels corresponding to one of the image forming elements, andeach image forming element projects a second solidification energy onto the surface of the solidifiable material, thereby projecting a second set of pixels on the surface of the solidifiable material, the second set of pixels defining the image pattern at a second position shifted relative to the first position, and each pixel in the second set of pixels corresponding to one of the image forming elements.