PL46503B1 - - Google Patents

Description

The invention relates to optical glasses based on the three-component melting systems B2O3 - ZnO - WOs (or MoOs) and B203 - CdO - WO3 (or MoO3), individually or in combination, and exhibiting a refractive index in the range of nd = = 1.67 - 1.83 and vd = 34 - 48. In this range, so far only rarely useful optical glasses have been obtained, especially glasses produced on the basis of boron-silicate, most often containing lead oxide. According to the invention, optical glass is based on a three-component glass basic, including with *). The patent holder has stated that the inventors are Dr. Werner Vogel and Wolfgang Heindorf. 22 - 47% by weight B * Os 50 - 68% "ZnO or 45 - 72%" CdO and 0 - 25% "WO3 and / or MoO3 with additives. Compared to known glasses with the same optical properties, glass in Due to the invention, and in particular glasses of the zinc-hram-borate group, they are almost completely colorless and show much higher light transmittance in the short-wave spectral range. Their chemical resistance is better than that of lead-containing glasses. By adding oxides of niobium, tantalum, lanthanum, zirconium, titanium and alkaline earth elements, the optical properties of these glasses can be further changed. 'Due to the low tendency to crystallize, large glasses can be made of these glasses. alloy solids without any extra durability. It is advisable to introduce alloy components, in particular in the form of zinc or cadmium tungstate, niobate titanates or tantalates. Glasses with the above-mentioned optical properties can be used because of their good dispersion and abnormal partial dispersion, especially for the correction of the secondary spectrum. some application examples are given for the smelted glasses according to the invention W03M0O3 ND2O5 Ta205 La2D3 TiC2 KjTiFa SiO2 na vd 17.3 - - _____ 1.68773 44.3 - - - _____ 1.67008 48.0 2.0 - 15.0 - _ _ _ _ 1.74 757 38.0 2.0 - - 15.0 - '. - • - - '1.71310 43.4 5.0 - 15.0 - 20.0 - - - 1.73773 44.6 5.0 - - 15.0 20.0 - - - 1.75349 40, 6 - 2.0 10.0 - 25.0 - - - 1.76 146 42.3 10.0 - - 11.0 17.0 _ _ _ 1.73 178 43.4 - 3.0 - 11.0 25.0 _ _ _ 1.74 172 45.4 2.0 - - 10.0 25.0 - - - 1.73867 46.4 2.0 - - 11.0 20.0 5.0 - - 1.76 776 39, 5 - - - 11.0 25.0 - 5.0 - 1.73420 44.4 6.0 - - _____ 1.73724 42.6 11.8 - - _____ 1.74478 41.3 15.1 -, - - - - - l - 1.74952 40.2 21.8 - - _____ 1.75953 38.5 5.0 5.0 - _____ 1.75258 39.7 2.0 - 15.0 _____ 1.80039 35, 1 5.0 - 11.0 - 20.0 _ _ _ 1.79469 38.2 10.0 - 11.0 - 17.0 _ _ _ 1.78 847 37.1 3.0 - - 10.0 20 , 0 5.0 - - 1.79903 38.0 10.0 - - 11.0 17.0 _ _ _ 1.81767 39.3 - 2.5 - 13.0 25.0 - - - 1.78795 42.7 3.0 - - 10.0 30.0 - - - 1.78723 43.1 - 2.5 - 10.1 25.3 - - - 1.77844 44.3 2.0 - 11.0 - 20.0 5.0 - - 1.82508 34.7 10.0 - 5.0 8.0 - - 3.0 - 1.75960 36.3 - 2.0 - - - 10.3 - 8, 0 1.81257 31.7 10.0 - - 11.0 17.0 - - - 1.75461 41.9 3.0 2.0 5.0 6.0 20.0 - - - 1.76205 40, 9 B * Oa 30.5 35.0 29.0 29.0 30.0 30.0 29.0 30.0 3 0.0 30.0 29.0 29.0 32.8 30.7 29.6 28.2 30.0 30.0 30.0 30.0 30.0 30.0 27.0 27.0 29, 0 30.0 30.0 23.2 30.0 30.0 ZnO 52.1 65.0 54.0 54.0 34.0 34.0 34.0 32.0 31.0 33.0 33.0 30.0 - - - - - - - - -. - - -. - - - - 10.0 20.0 CdO - - - - - - - - - - - 61.2 57.5 55.3 51.0 60.0 53.0 34.0 32.0 32.0 32 . 0 32.5 30.0 33.1 32.0 44.0 56.0 22.0 14.0 PL

Claims (13)

1. Claims 1. Optical glass having a refractive index of 1.67 - 1.83 and vj = 33 - 48, characterized in that it is a three-component base glass, consisting of 22 - 47 ° % by weight of B203 50-68% "ZnO or 45-72%" CdO and 0-25% "WO3 and / or Mo03 with additives. 2. Optical glass according to claim 1, having a refractive index nd = 1.67 - 1.77 and va = 36 - .48, characterized in that the base glass consists of 28 - 46% by weight B203 50 - 68% "ZnO and 0 - 25% "WO3 and / or MOO 3. Optical glass according to claim 1, having a refractive index nd = 1.73 - 1.83 and Vci = 33 - 45, characterized in that the base glass consists of 22 - 47% by weight B 2 O 3 45 - 72% CdO and 2 - 22 % by weight MoO3, WO3 is introduced into the alloy as CdW04. W03 or 2—11% - 2 - 4. Optical glass according to claim 2. The composition of claim 2, characterized in that it comprises up to 18% by weight additionally of Ta * Os and ND2O5, individually or together. 5. Optical glass according to claim 2 and 4, characterized in that it additionally contains 15 to 25% by weight of La 2 O 3. 6. Optical glass according to claim 2 to 5, characterized in that it additionally contains 1 to 10% by weight of TiO2, which is introduced as TiOa or also as K2TiFe. 7. Optical glass according to claim The process of claim 3, further comprising ND2O5 and TaaOo individually or together in an amount from 5-20% by weight. 8. S. Optical glass according to claims 3 and 7, characterized in that it additionally contains 15-25% by weight of La2C2. 9. Optical glass according to claim 3 and 8, characterized in that it additionally contains 0 - 4 wt.% ThO 2, 0 - 8 wt.% ZrO 2 and 0 - 12% wt. TiO 2 (also in the form of K 2 TiFe) singly or in combination. 10. Optical glass according to claim 3,19, characterized by the addition of alkaline earth oxides such as, for example, 0 - 12 wt.% CaO, 0 - 15 wt.% SrO and 0 - 20 wt.% BaO, alone or in combination. 11. Optical glass according to claim 1, 3 and 10, characterized by the addition of 0-4% by weight of AUO3 and / or 0-8% by weight of SiO2. 12. Optical glass, characterized in that it consists of any mixtures of glasses according to claim 1, 2 and 4 - 6 and glasses according to claims 3 and 7 - 11. 13. Optical glass according to claim 1 to 12, characterized in that 1 to 2% by weight of fluorine is used instead of oxygen with the raw material for melting. VEB Jenaer Glaswerk Schott & Gen. Deputy: dr Andrzej Au patent attorney PL