3D PRINTER, 3D PRINTING METHOD AND LENS MODULE

摘要

A lens module, comprising a first lens, a second lens and a third lens sequentially and coaxially arranged in the transmission direction of incident light. The first lens is a biconcave lens, the second lens is a meniscus lens, and the third lens is a biconvex lens. The first lens comprises a first curved surface and a second curved surface. The second lens comprises a third curved surface and a fourth curved surface. The third lens comprises a fifth curved surface and a sixth curved surface. The first to the sixth curved surfaces are sequentially arranged in the transmission direction of the incident light, and the curvature radii of the first to the sixth curved surfaces are sequentially -37±5%, 400±5%, -130±5%, -60±5%, 360±5% and -68±5% in a unit of millimeter. Due to the arrangement and parameter design of the first to the third lenses of the lens module, the 3D printer can achieve high machining precision. The present invention also provides a 3D printer and a 3D printing method thereof.