Verfahren und Vorrichtung zur Herstellung eines optischen Gegenstands

摘要

Optical material 1, which was already roughly molded, is deposited into a space defined by a top mold 2, a bottom mold 3 and a drum mold 4, and is then heated, pressed and molded, thus providing an optical element. By controlling the rate of plastic deformation of the optical material so as to prevent the material from entering clearance sections between the outside diameter of the top mold or of the bottom mold and the inside diameter of the drum mold, an optical element of high precision with no burr nor strain is provided at low cost.