Method of molding a glass composition into an optical element
AssigneeHoya Corporation
InventorsShin-Ichiro Hirota, Yu Oogami, Kazuaki Hashimoto
Life of this patent
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Abstract
A mold has a moling surface of a material containing silicon carbide and/or silicon nitride as a main component and a carbon thin film formed on the molding surface to prevent fusion sticking. A glass substance which has a sag point not higher than 565° C. and a predetermined composition free from arsenic oxide is introduced into the mold. The glass substance is press-formed in a heated and softened condition into a glass optical element of high precision.
Claims26
A method of producing a glass optical element, comprising the steps of:
- preparing a mold which has a molding surface covered with a carbon thin film to prevent fusion sticking;
- preparing a glass substance which has a predetermined glass composition and a predetermined sag point both of which are selected in relation to a pull-out phenomenon of said mold;
- and
- pressing said glass substance into said glass optical element within said mold without substantially fusion sticking with the pullout phenomenon suppressed.
A glass substance for use in manufacturing a glass optical element by molding within a mold, said glass substance having a predetermined sag point and a predetermined glass composition both of which are selected in relation to a pullout phenomenon of said mold.
A glass optical element manufactured by molding within a mold, said glass optical element having a predetermined sag point and a predetermined glass composition both of which are selected in relation to a pull-out phenomenon of the mold.
Dependencies are inferred from the claim text.