High Refractive Index Optical Glass

Abstract

The present invention relates to high refractive index optical bismuth oxide glasses, and also to the production and use of such glasses. A high transmission optical glass is described, which has the following composition (in mole % as oxide): Bi2O3 at least 40, ΣSiO2+B2O3+Al2O3 20–59, R2O0–10, RO0–30, other components 0.01– 20. The glass has a refractive index (nd) of 1.9≤nd≤2.2, an Abbe number of 10≤νd≤21, and a transition temperature (Tg) of not higher than 480°C.

Description

technical field [0001] The present invention relates to high refractive optical bismuth oxide glasses, and also to the production and use of such glasses. Background technique [0002] In recent years, the market trends in optics and optoelectronics (applications in imaging, projection, telecommunication, optical information technology, mobile hard disk and laser technology) are increasingly towards miniaturization. This can be seen in ever smaller end products, and naturally requires ever smaller miniaturization of the individual parts and assemblies of such end products. For producers of optical glass, this development has been accompanied by a significant reduction in the demand for raw glass, despite the increasing number of end products. At the same time, for glass producers, there is increasing price pressure from other processors, because in the production of such smaller components from glass blocks and / or ingots, there is Significantly greater amounts of scrap are...

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Problems solved by technology

Said publication does not describe the problem of a possible reduction in transmission in the case of glasses with a high bismuth oxide content

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