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Top-down DLP equipment contains a liquid tank that can hold resin, which is used to hold resin that can be cured after being irradiated by ultraviolet light of a specific wavelength.

The DLP imaging system is fixedly placed above the liquid tank, and its imaging surface is located just above the liquid tank. , through energy and pattern control, a thin layer of resin of a certain thickness and shape can be cured each time. A sinking mechanism is set up above the liquid tank. After each cross-sectional exposure is completed, it drops downward to a certain height, so that the currently cured solid resin is bonded to the sinking plate or the last molded resin layer.