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AssigneeHoya Corporation
InventorYasuhiro FUJIWARA
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A method for manufacturing glass containing a component(s) from Bi3+, Ti4+, Nb5+, and W6+, permitting stable production of high-quality glass with little coloration. A molten glass is contained in a container and is brought into contact with an electrode, a potential is applied so that the electrode serves as an anode and the container coming into contact with the molten glass serves as a cathode. The electrode has a standard electrode potential greater than that of the container. A voltage is applied between the cathode and the anode, with the value of the potential at which the current flowing between the cathode and anode essentially goes to zero as the upper limit thereof, to inhibit corrosion of the container. Further provided are methods of manufacturing a glass material for press molding and an optical element from the glass prepared by the above method.
A method for manufacturing glass containing one or more components from among Bi3+, Ti4+, Nb5+, and W6+, comprising melting glass starting materials, characterized in that a molten glass is contained in a container having a surface coming into contact with the molten glass that is made of a noble metal or a noble metal alloy, the molten glass is brought into contact with an electrode, a potential is applied so that the electrode serves as an anode and the surface of the container coming into contact with the molten glass serves as a cathode, at least the surface of the electrode coming into contact with the molten glass is comprised of a noble metal or a noble metal alloy having a standard electrode potential greater than the standard electrode potential of the noble metal or noble metal alloy of the surface of the container, and a voltage is applied between the cathode and the anode, with the value of the potential at which the current flowing between the cathode and anode essentially goes to zero as the upper limit thereof, to inhibit corrosion of the surface of the container coming into contact with the molten glass.
Dependencies are inferred from the claim text.