METHOD FOR TESTING GLASS MATERIAL, METHOD FOR EVALUATING GLASS MATERIAL AND METHOD FOR PRODUCING OPTICAL ELEMENT
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United States of America Patent
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Mar 7, 2013
app pub date -
Sep 6, 2012
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Sep 7, 2011
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Abstract
There is provided a method for testing a glass material and a method for evaluating a glass material capable of preventing a generation of a gap between an evaluation result and an actual degradation state of the surface of a lens, and also to provide a method for producing an optical element capable of sufficiently exhibiting chemical durability possessed by the optical element, which is the method for testing a glass material, to perform a test regarding a chemical durability of a glass material, comprising examining a correlation between a variation of hydrogen ion concentration indexes of a process liquid in which the glass material is immersed, and a variation of chemical durability index values of a prescribed type of the glass material.
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