Optical glass with low density

Abstract

The present invention relates to a glass having a high refractive index and a low density, which is suitable for use in the field of augmented reality (AR), in particular for AR glasses.

Description

technical field [0001] The invention relates to an optical glass, glass products and applications thereof. Background technique [0002] The present invention is about glasses that can be used in the field of Augmented Reality (AR). High-refractive glasses (and thus high-index glasses) are advantageous for AR glasses because they increase the field of view (FoV). On the other hand, the density of such glasses generally increases disproportionately with the refractive index. This means that even if it were possible to make the wafer thinner for AR applications, the glass used in the glasses would become quite heavy, making AR glasses uncomfortable to wear for long periods of time. Since there is a trend to move from over-the-head to standard eyeglass shapes which should then be worn longer or always be worn like normal eyeglasses, there is a need to make eyeglasses lighter. This weight reduction is also advantageous for many other application areas, as camera optics in the...

AI Technical Summary

Problems solved by technology

[0007] On the one hand, P-SF glasses in the Abbe diagram range are problematic due to the high cost of the mixture, and furthermore, due to the Bi 2 o 3 At higher levels, the glass is very soft (scratches easily) and has a relatively poor UV transmittance edge

In addition, both glasses are prepared discontinuously in platinum crucibles, which may lead to problems in the platinum alloy bath and the reduction of Bi(III) to Bi(0)

[0008] As already mentioned above, there are some glasses that are more or less suitable, but are usually still in the range of too low refractive index (typically heavy flint glasses) or are difficult to handle (typically lanthanum heavy flint glasses)

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