Optical glass, glass preforms, optical components and optical instruments

Abstract

The invention provides an optical glass, the components of which are represented by weight percentage, containing: P 2 o 5 : 4~30%; BaO: 0~20%; Nb 2 o 5 : 10~45%; Li 2 O+K 2 O+Na 2 O: 0~35%; of which BaO / Nb 2 o 5 0 to 0.5. Through reasonable component design in the present invention, the optical glass of the present invention has a lower temperature coefficient of refractive index while having the expected refractive index and Abbe number, which brings greater freedom for fixed-focus lenses to correct temperature drift It has excellent chemical stability and anti-devitrification ability, and the transmittance will not decrease significantly after long-term use. It is very suitable for vehicle-mounted lenses, especially suitable for applications that need to withstand harsh working environments, such as wind, sand, mud, and sharp temperature changes. and other imaging applications.

Description

technical field [0001] The invention relates to an optical glass, in particular to an optical glass with a refractive index of 1.73-1.81 and an Abbe number of 20-30. Background technique [0002] In the prior art, glass with a refractive index of 1.73-1.81 and an Abbe number of 20-30 belongs to high refractive index and high dispersion optical glass, and is widely used in various lens designs. In recent years, vehicle-mounted lens equipment has developed vigorously. Compared with general photography and other applications, the quality of vehicle-mounted lenses is closely related to safety. Harsh working environment, such as reversing camera, front-view camera, rear-view mirror auxiliary camera, etc. [0003] The principle of designing a vehicle-mounted lens to meet the harsh working environment is that the structure is as simple as possible, and the more complex the structure, the worse the reliability. Therefore, in order to meet the design requirements of long life (more...

AI Technical Summary

Problems solved by technology

[0009] However, if the optical glass with the above-mentioned refractive index and Abbe number needs to achieve a temperature coefficient of refractive index lower than -2.0, the component design must be different from the conventional ones, which usually leads to poor anti-devitrification performance of the glass, and is difficult for streaks and bubbles. Eliminate issues such as

If the anti-devitrification ability of the glass is poor, it will firstly increase the difficulty of the production of glass blanks, resulting in a decline in the yield rate, and even cannot be produced normally in serious cases; secondly, crystal precipitation is prone to occur during the secondary molding process, resulting in a decline in the yield rate. Can't even do secondary pressing

For glass materials used in the automotive field, if the yield rate of the glass is low, and the cold processing method cannot be used for secondary molding, the cost will increase significantly

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