Optical glass
A technology of optical glass and optical constants, applied in optics, optical components, instruments, etc., can solve problems such as blurring, easy fusion and adhesion of metal molds, and inappropriate optical glass, etc., and achieve low cost and good devitrification resistance.
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[0036] Yb 2 O 3 The component has the effect of increasing the refractive index of the glass and reducing the dispersion, but in order to maintain low Tg and At and good devitrification resistance, it is preferably 1% or less, and more preferably not contained substantially. Invention embodiment
[0037] Examples of the present invention are described below, but the present invention is not limited to these examples.
[0038] Tables 1 to 4 show the compositions of the examples (No. 1 to 26) and comparative examples (A to E) of the optical glass for precision press molding of the present invention, and show the composition of the glass obtained in the respective examples and comparative examples. Refractive index (n d ), Abbe number (ν d ), transformation point (Tg), yield point (At), and temperature difference between yield point and transformation point (At-Tg).
[0039] The optical glass for molding of Example Nos. 1 to 26 and the optical glass of Comparative Examples A to E are...