ANNEALING METHOD FOR OPTICAL GLASS ELEMENT

PROBLEM TO BE SOLVED: To shorten an annealing time for releasing a gradient refractive index and a stress during manufacturing procss such as a molding process without impacting to an optical property of an optical glass element. SOLUTION: A cooling rate of an annealing from a maximum temperature of...

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Bibliographische Detailangaben
1. Verfasser:	FUJIMURA MAMORU
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY GLASS MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES METALLURGY MINERAL OR SLAG WOOL OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To shorten an annealing time for releasing a gradient refractive index and a stress during manufacturing procss such as a molding process without impacting to an optical property of an optical glass element. SOLUTION: A cooling rate of an annealing from a maximum temperature of heating a formed optical glass element is adjusted between 20 deg.C and 50 deg.C per hour. And the maximum temperature of an annealing furnace is kept above a distortion temperature of a nitrate material to be annealed and below an annealing temperature; furthermore a retention time of the maximum temperature is kept from 5 minutes to an hour.