METHOD OF MANUFACTURING GLASS PREFORM AND METHOD OF MANUFACTURING OPTICAL ELEMENT

PROBLEM TO BE SOLVED: To provide a method of manufacturing a high grade preform free from devitrification and striae even when glass not so high in stability or glass having volatile in a melted state is used. SOLUTION: In the method of manufacturing the glass preform used for precise press molding,...

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1. Verfasser:	SUU GAKUROKU
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY GLASS JOINING GLASS TO GLASS OR OTHER MATERIALS MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES METALLURGY MINERAL OR SLAG WOOL OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method of manufacturing a high grade preform free from devitrification and striae even when glass not so high in stability or glass having volatile in a melted state is used. SOLUTION: In the method of manufacturing the glass preform used for precise press molding, molten glass lump is separated from molten glass flowing out from a flow out port and is press-molded to form a glass body having a shape similar to that of the preform and the glass body is formed into the preform at least through a grinding process. COPYRIGHT: (C)2008,JPO&INPIT