Optical glass

Abstract

The invention provides optical glass which is high in transmittance, good in glass interior quality and beneficial for economic volume production in order to solve the technical problems. The opticalglass comprises, by weight, 0-10% of SiO2, 10-30% of B2O3, 0-20% of La2O3, 0-12% of ZrO2, 10-35% of BaO and 15-40% of Nb2O5. Through the reasonable formula design, the optical glass has the refractiveindex of 1.82-1.88 and the abbe number of 27-33, is high in transmittance, good glass interior quality and beneficial for economic volume production, and can be widely applied to digital cameras, digital video cameras, camera cell phones and other devices.

Description

technical field [0001] The invention relates to an optical glass with a refractive index of 1.82-1.88 and an Abbe number of 27-33, as well as a glass preform and an optical element made of the optical glass. Background technique [0002] In optical design, lenses made of high refraction and high dispersion optical glass are used in combination with lenses made of low refraction and low dispersion optical glass to correct the chromatic aberration of the optical system. The higher the refractive index and dispersion of the glass, the greater the content of components added to give the glass high refraction and high dispersion properties. However, since these components mainly absorb light in the short-wavelength region, the transmittance of the glass in the short-wavelength region will deteriorate, thereby affecting the imaging quality. [0003] CN1931755A discloses a kind of optical glass whose refractive index nd is greater than 1.80 and Abbe number Vd is less than 30, and ...

AI Technical Summary

Problems solved by technology

However, since these components mainly absorb light in the short-wavelength region, the transmittance of the glass in the short-wavelength region will deteriorate, which will affect the image quality

[0003] CN1931755A discloses a kind of optical glass whose refractive index nd is greater than 1.80 and Abbe number Vd is less than 30, and its TiO 2 The content is 22-37%, in such a high TiO 2 When the content is low, the light absorption performance of the glass is poor, and the transmission performance tends to move to the long-wave direction, resulting in obvious coloring of the glass. At the same time, the TiO 2 High content will also lead to glass devitrification

[0005] The glass disclosed in CN102172557A contains a large amount of bismuth oxide. Bismuth oxide is beneficial to increase the refractive index of the glass and reduce the transition temperature of the glass. However, if its content is too large, the devitrification resistance of the glass will be reduced, resulting in easy crystallization of the glass, making it difficult to obtain qualified products

At the same time, bismuth oxide is expensive, and a large amount of introduction is not conducive to the reduction of production costs

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