Ultraprecision Mass Fabrication of Aspherical Fresnel Lens by Glass Molding Press
Glass molding press (GMP) was applied to the fabrication of glass aspherical Fresnel lens for high-efficiency mass production. A pair of molds for the Fresnel lens was precisely fabricated on the Nickel Phosphorous (Ni-P) plating layer by the single diamond cutting with multi-axis machining center. A kind of low transition temperature (Tg) glass was heated to several tens degree centigrade above its Tg and compressed between the two molds. In this way, the shape of the mold was replicated to the glass lens surface. The molding process was simulated by finite element method (FEM), and the molding condition was optimized to minimize the residual stress.
T. F. Zhou et al., "Ultraprecision Mass Fabrication of Aspherical Fresnel Lens by Glass Molding Press", Advanced Materials Research, Vol. 325, pp. 713-718, 2011