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Helmuth E Meissner

Tetsuro Izumitani

Shinichiro Hirota

Kishio Sugawara

Optical lenses high in configurational accuracy with smooth surfaces are press molded in a carefully finished, polished and properly dimensioned mold preferably in a non-oxidizing atmosphere. The molding operation includes placing a quantity of glass having an internal viscosity of at least about 10.sup.6 poises in such a mold while maintaining the mold at a temperature at least equal to the glass transition temperature and thereafter passing the glass into a lens of predetermined configuration at a pressure of at least 100 Kg/cm.sup.2. Performing procedures are also disclosed.

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Tokyo, Japan

Helmuth E Meissner