PRODUCTION OF GLASS FORM WITH REFRACTIVE INDEX DISTRIBUTION

PURPOSE:To obtain the title glass form with the refractive index distribution smoothly corrected by making a heating treatment after ion exchange treatment of a glass form in a molten salt lower in diffusion rate than that used in said ion exchange process. CONSTITUTION:A refractive index distributi...

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Bibliographische Detailangaben
1. Verfasser:	FUJII KIYOSUMI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY GLASS JOINING GLASS TO GLASS OR OTHER MATERIALS MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES METALLURGY MINERAL OR SLAG WOOL OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain the title glass form with the refractive index distribution smoothly corrected by making a heating treatment after ion exchange treatment of a glass form in a molten salt lower in diffusion rate than that used in said ion exchange process. CONSTITUTION:A refractive index distribution-type lens (GI lens) is dipped into a molten salt (normally NaNO3) to carry out ion exchange treatment followed by dipping the resultant lens into a second molten salt lower in diffusion rate and greater in specific gravity than NaNO3 (pref. RbNO3, CsNO3, Sr(NO3)2, Ba(NO3)2, etc.) to make a heating treatment, thus accomplishing refractive index distribution correction. It is preferable that the treatment temperature be higher than the ion exchange treatment temperature by 20-50 deg.C (i.e., 470-500 deg.C) and the treatment time 10-30min.