The paper mainly introduces a design process of the optical system of the desktop rapid prototyping and manufacturing system. Compared with several kinds of light sources

a computer-controlled UV lamp is used because of its high quality and low cost. The beam of UV light is focused into an optical fiber through an ellipsoid lens and taper lens

etc.

then shines down the surface of resin after diffusing

collimating

focusing

filtering stray lights. The fiber is fixed on a workbench controlled by computer to manufacture the parts automatically. The optical system is characterized by low cost

high quality light beam

stabilization and utility.