Method for manufacturing optical element
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United States of America Patent
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Feb 28, 2017
Grant Date -
Dec 12, 2013
app pub date -
Jun 5, 2013
filing date -
Jun 7, 2012
priority date (Note) -
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Abstract
A method for manufacturing an optical element includes pressing a phosphate-based glass containing Bi2O3 in a proportion of 10 mass % or higher and 30 mass % or lower with a hot mold; and then cooling the same, in which pressure equal to or higher than the critical pressure of oxygen and equal to or lower than a strength of glass is continuously applied to the glass from the time of bringing the glass into contact with the pressing surface of the mold at a glass viscosity of log η=9 [dPa·sec] or higher and 10 [dPa·sec] or lower until the glass viscosity log η increases to 12 [dPa·sec] by cooling.
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