GLASS MOLDED ARTICLE AND METHOD FOR PRODUCING SAME, OPTICAL ELEMENT BLANK, AND OPTICAL ELEMENT AND METHOD FOR PRODUCING SAME
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United States of America Patent
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Jul 16, 2015
app pub date -
Jul 11, 2013
filing date -
Jul 18, 2012
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Abstract
When heating a glass gob including optical glass containing phosphorus, oxygen and fluorine to a temperature at which press-molding is possible, there are many cases in which the surface of the glass gob crystallizes and hardens. The problem of surface crystallization of glass gobs when press-molding is particularly prominent with glass to be polished and subjected to press-molding at a high temperature. This method for producing a glass molded article includes a step for covering the surface of a glass gob, which includes optical glass containing phosphorus, oxygen and fluorine, with a covering agent containing phosphorus, and a step for heating, softening and molding the glass gob covered by the covering agent.
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