| abstract |
PURPOSE:To mass produce optical parts simply with omitting processes of rough grinding and finish polishing, by using a top and a bottom molds, subjecting an optical crystal material to hot forging. CONSTITUTION:An optical crystal materials such as sodium chloride, silver chloride, thallium chloride, zinc selenide, etc. is utilized because it has characteristics wherein ductility is increased at high temperature and forging can be carried out at high temperature of (0.5-0.9)Tm (Tm is melting point of optical crystal shown by absolute temperature). Namely, the optical crystal material is put between the top mold 1 and the bottom mold 2 having pressing faces with <=about 0.05mu average rughness of ten sampled, covered with the corrosion-resistant coating layer 5 such as platinum, aluminum nitride, etc., heated to a given temperature by the heater 3, and pressed by the top mold 1 and the bottom mold 2, to form the optical part 4. |