3D printing system based on projection exposure technology

Abstract

The invention discloses a 3D printing system based on a projection exposure technology, which comprises a material storage device used for storing liquid photosensitive resin and provided with transparent glass at the bottom, printing equipment used for exposing the photosensitive resin to form a required product, and a motion platform for realizing the printing equipment relative to the material storage device, the optical mechanism is arranged below the transparent glass; the optical mechanism sequentially comprises a point light source, a shaping and beam expanding lens group, a digital micromirror element, a secondary miniature lens group and a projection objective lens along a light path propagation path, wherein the shaping and beam expanding lens group is used for expanding the beam of the point light source into an area light source and shaping the area light source into a parallel area light source; the digital micromirror element is used for uploading an image; the secondary miniature lens group is used for miniature the shaped parallel light; and the data processing mechanism is used for uploading the image to the digital micromirror element. The invention further discloses a 3D printing method which is realized through the 3D printing system based on the projection exposure technology. Through the structure, the printing precision is improved.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a 3D printing system based on projection exposure technology. Background technique [0002] As a forward-looking and strategic technology, 3D printing technology has important applications in high-end fields such as aerospace, biomedicine, weapons and equipment, automobiles and molds. In the field of biomedicine, 3D printing technology provides a new flexible preparation method for biochips and biochemical devices, and also provides new research methods and platforms for biomaterials and artificial organs, and realizes the fabrication of complex 3D carrier scaffolds. However, the existing 3D printing technology is still difficult to meet the application requirements in terms of printing accuracy and printing format. At present, most commercial 3D printers have a horizontal resolution of only 50 microns, and a depth resolution of about 50-100 microns. [0003] For large-scal...

AI Technical Summary

Problems solved by technology

[0003] For large-scale and high-precision 3D structures, the current 3D printing technology has not yet effectively solved the problem that printing accuracy and printing size cannot be balanced

On the one hand, the stereolithography technology based on two-photon or laser direct writing can realize the printing of complex structures as small as 0.1 microns, but it is not suitable for the production of biochips due to the limited printing size (less than a few hundred microns); on the other hand, based on The projection-type stereolithography technology is limited by the printing accuracy (greater than 50 microns), and it is difficult to meet the production requirements of tiny structures.

For example, in order to achieve large-format 3D printing, the traditional projection 3D printing system adopts an enlarged optical path system. To achieve a format of 48mm*27mm in single-view exposure, the optical path needs to be enlarged by 2.5 times, and the digital resolution will become 27um. Accuracy will be greatly reduced

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