METHOD FOR MANUFACTURING GLASS OPTICAL ELEMENT AND METHOD FOR DETERMINING GLASS COMPOSITION OF GLASS BLANK

摘要

PROBLEM TO BE SOLVED: To provide a method capable of easily manufacturing a glass optical element having a desired refractive index by specified rules with good accuracy even if glass blank to be subjected to a press forming process step undergoes any heat history after melting.

SOLUTION: The method comprises manufacturing the glass optical element having the desired refractive index n3by the press forming process step including press forming the softened glass blank by using forming dies, then cooling the formed glass optical element. The glass blank consisting of the glass having a prescribed composition is used and the refractive index n2of the provisional optical element obtained by the press forming process step is measured. The difference between the reference refractive index n1when the glass of the prescribed composition is processed under the regulated conditions and the refractive index n2of the provisional optical element is determined. The glass having the refractive index of the value obtained by adding the difference or an amount approximately equal to the difference to the desired refractive index n3when the glass is processed under the regulated conditions is prepared and the glass optical element is obtained by the press forming method using the glass blank consisting of the prepared glass.

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