ANNEALING METHOD FOR OPTICAL GLASS ELEMENT

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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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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creator FUJIMURA MAMORU
description 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.
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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. 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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.</abstract><edition>7</edition><oa>free_for_read</oa></addata></record>
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subjects CHEMISTRY
GLASS
MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
METALLURGY
MINERAL OR SLAG WOOL
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
title ANNEALING METHOD FOR OPTICAL GLASS ELEMENT
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