Glass manufacturing – Press molding machine – Mold ring or baffle laterally and movably supported
Patent
1989-08-22
1991-05-14
Lindsay, Robert L.
Glass manufacturing
Press molding machine
Mold ring or baffle laterally and movably supported
65 37, 65355, 249 67, 249111, 425416, 425808, C03B 1108
Patent
active
050152807
ABSTRACT:
A mold arranged between a pair of heater blocks for molding an optical element comprises a pair of first and second elements each having a molding surface for defining a cavity and an outer surface opposite to the molding surface and in contact with a corresponding heater block, and a ring member for guiding the first and second elements. The rear surface of at least one of the first and second elements has a part which is not in contact with the corresponding heater block. Also, another mold comprises a pair of first and second elements each having a molding surface for defining a cavity and an outer surface opposite to the molding surface, a first ring member for guiding the first and second elements, and a second outer ring member made of a material with a lower thermal conductivity than that of the first ring member. A molding method for optical elements is such that a glass with a viscosity of 10.sup.12 poise or more is fed to a mold with a temperature at or below the glass transition point, heated to a temperature corresponding to the glass viscosity of 10.sup.8 to 10.sup.10 poise and pressed for 3 to 90 seconds. The glass is then cooled at a rate of 1.5.degree. to 2.5.degree. C./sec to a viscosity of 10.sup.10 to 10.sup.11 poise and thereafter at a rate of 0.2.degree. to 1.5.degree. C./sec with the glass pressurized, and removed as an optical element at or below the glass transition point.
REFERENCES:
patent: 2059767 (1936-11-01), Bausch
patent: 3887350 (1975-06-01), Jenkins
patent: 4481023 (1984-11-01), Marechal et al.
patent: 4629489 (1986-12-01), Hirota et al.
patent: 4738703 (1988-04-01), Izumitani et al.
Inoue Takashi
Kimoto Takayuki
Nakamura Shoji
Sunohara Masaaki
Yonetani Daijirou
Lindsay Robert L.
Matsushita Electric - Industrial Co., Ltd.
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