PREFORM FOR PRECISION PRESS MOLDING AND METHOD FOR PRODUCING OPTICAL ELEMENT

PROBLEM TO BE SOLVED: To provide an oxide glass preform containing a fluorine component which is useful for producing a good optical element, such as a lens, by precision press molding, and to provide a method for producing the good optical element by using the preform. SOLUTION: The preform for pre...

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Hauptverfasser:	YAMAMOTO HIDEAKI, SUU GAKUROKU
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS GLASS MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES METALLURGY MINERAL OR SLAG WOOL OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an oxide glass preform containing a fluorine component which is useful for producing a good optical element, such as a lens, by precision press molding, and to provide a method for producing the good optical element by using the preform. SOLUTION: The preform for precision press molding is characterized in that light reflectance on two faces mutually facing opposite sides with respect to the center of the preform have different values and is formed of oxide glass containing a fluorine component, and the preform for precision press molding is characterized in that surface free energies at two faces mutually facing opposite sides with respect to the center of the preform have different values and is formed of oxide glass containing a fluorine component. In a method for producing an optical element by precision press molding a glass preform, the method for producing the optical element uses the preform for precision press molding. COPYRIGHT: (C)2008,JPO&INPIT