Light-curing 3D printing equipment and its image exposure system

Abstract

An image exposure system of a 3D printing device comprises: a spatial light modulator (206), a light source (201), a projection lens (208), a micro-displacement driving mechanism and a controller. The spatial light modulator (206) is provided with a plurality of micromirrors (311) for adjusting the reflective direction of light illuminating the micromirrors according to a control signal, wherein each micro mirror (311) is a concave mirror for converging the light illuminating the micromirror to create a micro light spot of which the size is smaller than a pixel size corresponding to the micromirror (311); the light source (201) generates a light beam illuminating the spatial light modulator (206); the projection lens (208) is aligned with a first direction of the spatial light modulator (206) so that a micro light spot array formed through the micromirror (311) by the light source (201) is projected onto the surface of a light-sensitive material; the micro-displacement driving mechanism is connected with the spatial light modulator (206), and can drive the spatial light modulator to move in third and fourth directions that are perpendicular to each other, in order to finely adjust the position on the surface of the light-sensitive material onto which the micro light spot array is projected; and the controller is used for instructing the light source to perform multiple exposures, and also instructing the micro-displacement driving mechanism to move upon every exposure, in order to project the micro light spot arrays of the various exposures onto different positions on the surface of the light-sensitive material.

Description

technical field [0001] The invention relates to photocurable 3D printing equipment, in particular to an image exposure system of photocurable 3D printing equipment. Background technique [0002] 3D printing technology is based on the computer three-dimensional design model, through the software layered discrete and numerical control forming system, using laser beams, hot-melt nozzles, etc. to accumulate metal powder, ceramic powder, plastic, cell tissue and other special materials layer by layer Bonding, and finally overlaying and molding to create a solid product. Unlike the traditional manufacturing industry, which shapes and cuts raw materials through mechanical processing methods such as moulds, turning and milling to finally produce finished products, 3D printing transforms a three-dimensional entity into several two-dimensional planes. The complexity of manufacturing is reduced. This digital manufacturing mode does not require complex processes, huge machine tools, o...

AI Technical Summary

Problems solved by technology

DMD has many advantages in 3D printing. For example, it can handle ultraviolet light below 400nm without worrying about being damaged. However, its limited resolution restricts its development. For example, the current highest resolution of DMD is 1920×1080

However, this resolution can only produce objects with an area of ​​192×108mm with the commonly used 0.1mm precision in 3D printing, which obviously limits its application.

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