OPTICAL GLASS, PREFORM AND OPTICAL ELEMENT
PROBLEM TO BE SOLVED: To provide an optical glass having a refractive index (n) and an Abbe number (ν) which are in each desired range, a small partial dispersion ratio (θg, F), and heightened transparency to visible light, and to provide a preform and an optical element using the optical glass.SOLU...
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Format | Patent |
Language | English |
Published |
18.10.2012
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Abstract | PROBLEM TO BE SOLVED: To provide an optical glass having a refractive index (n) and an Abbe number (ν) which are in each desired range, a small partial dispersion ratio (θg, F), and heightened transparency to visible light, and to provide a preform and an optical element using the optical glass.SOLUTION: The optical glass contains in mol%, a ≤60.0% SiOcomponent and a ≤25.0% TaOcomponent to a total amount of a glass material of a composition in terms of oxides, and the partial dispersion ratio (θg, F) satisfies following relations with the Abbe number (ν): in the range of ν≤25, (-0.00160×ν+0.63460)≤(θg, F)≤(-0.00563×ν+0.75573), and in the range of ν>25, (-0.00250×ν+0.65710)≤(θg, F)≤(-0.00340×ν+0.70000). |
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AbstractList | PROBLEM TO BE SOLVED: To provide an optical glass having a refractive index (n) and an Abbe number (ν) which are in each desired range, a small partial dispersion ratio (θg, F), and heightened transparency to visible light, and to provide a preform and an optical element using the optical glass.SOLUTION: The optical glass contains in mol%, a ≤60.0% SiOcomponent and a ≤25.0% TaOcomponent to a total amount of a glass material of a composition in terms of oxides, and the partial dispersion ratio (θg, F) satisfies following relations with the Abbe number (ν): in the range of ν≤25, (-0.00160×ν+0.63460)≤(θg, F)≤(-0.00563×ν+0.75573), and in the range of ν>25, (-0.00250×ν+0.65710)≤(θg, F)≤(-0.00340×ν+0.70000). |
Author | TSUDA TETSUYA TSUCHIBUCHI NANA |
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Snippet | PROBLEM TO BE SOLVED: To provide an optical glass having a refractive index (n) and an Abbe number (ν) which are in each desired range, a small partial... |
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SubjectTerms | CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY GLASS JOINING GLASS TO GLASS OR OTHER MATERIALS 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 |
Title | OPTICAL GLASS, PREFORM AND OPTICAL ELEMENT |
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