Negative anomalous dispersion optical glass

Abstract

The invention relates to an optical glass having negative anomalous dispersion. The optical glass has optical constants of a refractive index (nd) being above 1.70 and Abbe number (vd) being in a range of 29-35, and has large negative anomalous dispersion, low internal transmittance (10mm / tau80%) and excellent acid resistance (DA). The optical glass does not contain harmful components such as PbOand expensive components like GeO2 and Ta2O5. The above-mentioned negative anomalous dispersion optical glass is characterized in that the optical glass contains (mol%) the following components as necessary components: 10-40% of SiO2 and 10-30% of B2O3, wherein SiO2 / B2O3 can be less than or equal to 3, 5-20% of Nb2O5, 1-10 % of ZrO2, and further contains 2-15% of BaO, 2-20% of MgO, 1-10% of Li2O,and 1-12% of Na2O.

Description

technical field [0001] The present invention relates to an optical glass having a large negative anomalous dispersion value, an optical constant whose refractive index (nd) is more than 1.70 and Abbe's number (vd) is more than 29 but less than 35. And does not contain harmful oxide PbO components, and expensive GeO 2 、 Ta 2 o 5 and other components. More specifically, in addition to optical constants, it has a low internal transparency ratio and excellent acid resistance. Background technique [0002] In the design of the optical system, for ordinary optical glass that does not have anomalous dispersion characteristics, a combination of two optical lenses with different Abbe numbers is usually used to eliminate the chromatic aberration of the two colors of light. However, there is still a difference in the second spectral region Residual chromatic aberration, the secondary spectrum. Especially in the design of high-end optical systems such as SLR cameras, video cameras,...

AI Technical Summary

Problems solved by technology

Some introduced a large amount of Li 2 O, Na 2 O component, there are defects such as poor acid resistance

Images