Optical glass

Abstract

This invention relates to an optical glass without doubt in ecology, being provided in the following application fields: imaging, sensor, microscope, medicine technology, digital projector, photoetching technology, laser technology, wafer or chip technology, communication, optical communication technology and optics or illumination in the automobile field, wherein the optical class comprises a refractive index nd which is equal to or more than 1.69 and equal to or less than 1.82, and a abbe value vd which is equal to or more than 3 and equal to or less than 46, being characterized by good chemical stability, excellent crystallizing stability, high transmittivity and the following components (in weight proportion): 20 to 30 weight proportion of SiO2,0.5 to 10 weight proportion of B2O3, 0.5 to 8 weight proportion of Al2O3, 10 to 20 weight proportion of La2O3, 8 to 18 weight proportion of Nb2O5, 8 to 28 weight proportion of CaO, 1 to 8 weight proportion of ZnO, 4 to 12 weight proportion of TiO2, and 0.5 to 6 weight proportion of ZrO2. Meanwhile, beside Ge2O2 with the maximum weight proportion of 8, the optical glass can contain 3 weight proportion of SrO, 8 weight proportion of BaO, 3 weight proportion of Na2O, a common clarification (except arsenic), no more than 5 weight proportion of Ag2O, MgO or Y2O3, WO3, no more than 2 weight proportion of Yb2O3 and / or Ta2O5. Besides, the glass contains no more than 6 weight proportion contents of the P2O5 and F, and no more than 1 weight proportion content of F, the optical glass can further contain less than 2 weight proportion of Gd2O3. The glass is optimized to the glass without PbO, As2O3 and Bi2O3, and does not contain alkalis oxide in the optimized operating method.

Description

technical field [0001] The invention relates to optical glasses, uses of such glasses, optical elements or preforms of such optical elements, methods for producing such optical elements and optical components or optical components consisting of such optical elements. Background technique [0002] For imaging, sensors, microscopy, medical technology, digital projection, lithography, laser technology, wafer / chip technology and optical positions such as those required here for optics / illumination in the communication, optical communication technology and automotive fields (lanthanum flint range , including the boundary range towards lanthanum heavy chert), known optical glasses generally containing As 2 o 3 As an essential clarifying agent, so that despite the high refractive index and absorbing components such as lanthanum oxide or titanium oxide, in addition to the desired optical position (refractive index 1.69≤n d ≤1.82 and Abbe value 33≤v d ≤46), but still especially hi...

AI Technical Summary

Problems solved by technology

However, this glass has obvious disadvantages in process technology, and this glass is very sensitive to redox conditions in the melting unit (by Bi 0 induced transmittance reduction), and thus require further increased process technology attention in addition to the redox stabilization typically driven by arsenic