Manufacturing of three-dimensional micro-parts by UV laser induced polymerization

Abstract

This research deals with the development of a simple and practical method for manufacturing high-aspect-ratio (height/width) micro-parts and three-dimensional micro-parts. The desired product shape is obtained by writing along the contour of the product on the surface of a liquid photopolymer using a focused UV laser beam. The written pattern then becomes solid so as to produce a solidified polymer mold or structure. This paper examines the effect of physical parameters such as wavelength of laser beam, focal length of lens, absorption coefficient and writing speed on the shapes of the solidified polymer. The examination is done theoretically, and the optimum conditions to produce high-aspect-ratio micro-parts and three-dimensional micro-parts are also verified. Using these conditions, various microstructures are produced.