| 摘要 |
PURPOSE:To simply obtain a nonspherical surface lens useful as searchlight, etc., by pouring molten glass into the rotary surface of molten lead while rotating the molten lead in a furnace together with the furnace in such a way that the melt surface of lead becomes a nonspherical surface shape and cooling. CONSTITUTION:Molten lead AG is fed to a furnace 1 consisting of a heating nichrome wire 2, a shaft 3 and a revolving mechanism 4 of NC control circuit to balance by a correlation equation shown by formula I [x is horizontal line; y is axis of ordinate; K is function of angular speed omega(rad/s) and specific gravity of molten lead r] up to desired depth. Then the furnace 1 is rotated at desired angular speed omega(rad/s), the lead surface is made into a nonspherical surface (parabola) of a curved line equation shown by formula II (g is acceleration of gravity; H is depth of molten lead) and made into a stationary state. Then molten glass S is poured from an electric furnace 6 through a conduit 5 to the rotary surface of the molten lead AG of nonspherical surface in the furnace 1 and annealed to solidify the molten lead AG and the molten glass S. Then the glass of nonspherical surface is taken out from the mold face of the molten lead AG and processed to give a nonspherical lens. |
