Optical glass having high refractive index

Abstract

The invention relates to a precise molded optical glass having a high refractive index and a low dispersion and an optical element, an optical parts or an optical assembly containing the optical glass. The refractive index nd of the optical glass is more than or equal to 1.74 but less than or equal to 1.82, an Abbe coefficient ud is more than or equal to 40.0 but less than or equal to 47 and a transformation temperature Tg is less than or equal to 600 DEG C. The optical glass contains the following oxide based weights: SiO2 of 1 to 5 wt. %, B2O3 of 14 to 30 wt. %, La203 of 18 to 28 wt. %, Gd2O3 of 5 to 20 wt. %, Ta2O5 of 2 to 13 wt. %, Li2O of 1to 5 wt. %, ZnO of 14 to 25 wt. %, ZrO2 of 2 to 6 wt. %, WO3 of 5 to 12 wt. %, Nb2O5 of 1 to 7 wt. %, Na2O of 0 to 1 wt. % and Yb2O3 of 0 to 1 wt. %. For favorable application, the optical component can be produced without finishing, such as lens for digital camera. The precise molded optical component can be applied to the fields of imaging, projecting, remote communication, photo-communication engineering and laser technique.

Description

technical field [0001] The present invention relates to precision shaped optical glass with high refractive index and low dispersion. For advantageous applications, optical components can be produced without finishing, such as lenses for digital cameras, for example. Optical components produced by precision molding are used in the fields of imaging, projection, telecommunication, optical communication engineering and laser technology. Background technique [0002] In the precision molding process, the lower the transition temperature of the glass, the longer the life of the mold, and therefore the higher the profit. Therefore, there is a need for so-called "low Tg glasses", ie glasses with low melting points and low transition temperatures, ie glasses with sufficient viscosity for processing at as low a temperature as possible. [0003] In recent years, the market trend in the field of optics and optoelectronics technology is towards increasing miniaturization. This manif...

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Problems solved by technology

Bi is included in each case 2 o 3 And it imparts its own color to the glass, which makes the internal transmittance of the glass worse

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