Optical glasses with improved varying partial dispersion in the optical positional range of lanthanum crown glasses and lanthanum flint glasses
专利汇可以提供Optical glasses with improved varying partial dispersion in the optical positional range of lanthanum crown glasses and lanthanum flint glasses专利检索，专利查询，专利分析的服务。并且Optical, fluorine containing barium borosilicate glasses having an improved varying partial dispersion in the optical positional range of lanthanum crown and lanthanum flint glasses wherein the ratio of SiO.sub.2 with respect to SiO.sub.2 and B.sub.2 O.sub.3 is at least 0.62 and the content of fluorine in said glass is between 2 and 7 grams per 100 cc of said glass.，下面是Optical glasses with improved varying partial dispersion in the optical positional range of lanthanum crown glasses and lanthanum flint glasses专利的具体信息内容。
Accordingly, what is claimed is:1. Optical glasses containing barium borosilicate having a varying partial dispersion P.sub.g,F = (n.sub.g - n.sub.f)/(n.sub.F - n.sub.C) in the optical positional range of lanthanum crown and lanthanum flint glasses having an index of refraction of about 1.642 to 1.742 and v.sub.d of about 44.0 to 58.0 and wherein the amount of SiO.sub.2 present in the glass satisfies the following condition: ##EQU2## is at least 0.62 and the content of fluorine in said glass is at least 7 grams per 100 cc. of said glass consisting essentially of:______________________________________ weight percent ______________________________________ SiO.sub.2 20 to 26 B.sub.2 O.sub.3 3 to 8 BaO 20 to 38 MgO 0 to 6 CaO 0 to 18 SrO 0 to 18 La.sub.2 O.sub.3 20 to 32 Y.sub.2 O.sub.3 0 to 25 ThO.sub.2 0 to 18 ______________________________________ and up to 12 equivalent percent of one or more of the following ingredients to adjust the required n.sub.d and v.sub.d values: ZnO, PbO, CdO, TiO.sub.2, ZrO.sub.2, Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5, WO.sub.3, MO.sub.3 and mixtures thereof.2. Optical glass according to claim 1 consisting essentially of:______________________________________ weight percent ______________________________________ SiO.sub.2 and B.sub.2 O.sub.3 26 to 31 BaO + MgO + CaO + SrO 25 to 40 La.sub.2 O.sub.3 + Y.sub.2 O.sub.3 + ThO.sub.2 20 to 32 ______________________________________ 3. Optical glass of claim 1 comprising 60 percent by weight of highly refracting, weakly or moderately dispersing materials selected from the group consisting of La.sub.2 O.sub.3, ThO.sub.2, ZrO.sub.2, BaO, SrO, CaO, ZnO, Ta.sub.2 O.sub.5, Nb.sub.2 O.sub.5 and mixtures thereof.4. Optical glass of claim 3 wherein Y.sub.2 O.sub.3 is added to the composition to substitute an equal amount of La.sub.2 O.sub.3.5. Optical glass of claim 4 wherein up to 25 weight percent of said La.sub.2 O.sub.3 is substituted with Y.sub.2 O.sub.3.6. Optical glass of claim 5 further containing a strong dispersing material selected from the group consisting of MgO, PbO, CdO, Al.sub.2 O.sub.3, TiO.sub.2, WO.sub.3 and mixtures thereof, in an amount sufficient to adjust the required optical position and crystallization stability of said glass.7. Optical glass of claim 3 further containing a strong dispersing material selected from the group consisting of MgO, PbO, CdO, Al.sub.2 O.sub.3, TiO.sub.2, WO.sub.3 and mixtures thereof, in an amount sufficient to adjust the required optical position and crystallization stability of said glass.8. Optical glass according to claim 1 comprising:______________________________________ weight percent ______________________________________ SiO.sub.2 20 to 26 B.sub.2 O.sub.3 2 to 8 BaO 20 to 38 La.sub.2 O.sub.3 20 to 32 ThO.sub.2 0 to 18 F.sub.2 -O 2 to 7 ______________________________________ and wherein the total amount of SiO.sub.2 and B.sub.2 O.sub.3 present in the composition is between 26 and 31 weight percent.9. Optical glass of claim 1 further containing the following strongly dispersing ingredients:______________________________________ weight percent ______________________________________ CdO 0 to 8 PbO 0 to 10 Al.sub.2 O.sub.3 0 to 7 TiO.sub.2 0 to 8 WO.sub.3 0 to 7 ______________________________________ wherein the total amount of said ingredients present in said glass is no greater than 8 equivalent percent.10. Optical glass of claim 1 comprising the following materials:______________________________________ weight percent ______________________________________ SiO.sub.2 20.75 B.sub.2 O.sub.3 7.00 BaO 26.08 La.sub.2 O.sub.3 31.12 ThO.sub.2 15.05 ______________________________________ and 3.74 weight percent of F.sub.2 -O based upon the total weight of oxides present in said glass.11. Optical glass of claim 1 comprising the following materials:______________________________________ weight percent ______________________________________ SlO.sub.2 24.6 B.sub.2 O.sub.3 5.3 BaO 33.5 La.sub.2 O.sub.3 28.8 TiO.sub.2 5.2 ThO.sub.2 2.6 ______________________________________ and 3.3 weight percent of F.sub.2 -O based upon the total weight of oxides present in said glass.12. Optical glass of claim 1 containing 2 to 7 weight percent of F.sub.2 -O based upon the total weight of oxides present in said glass.
This is a continuation of application Ser. No. 402,805, filed Oct. 2, 1973, now abandoned.
BACKGROUND OF THE INVENTION
This invention relates to a novel class of optical glasses, and more particularly, to such glasses which exhibit good stability with respect to changes in climatic conditions, low staining susceptibility and can be ground, polished and pressed like ordinary silicate glasses. These glasses have the same optical position as lanthanum crown glasses (LaC) and lanthanum flint glasses (LaF), but exhibit a higher partial dispersion Pg,F than prior glasses.
Normal commercial glasses, in the optical positional range of the LaC and LaF glasses, have a partial dispersion Pg,F = (ng - nF)/nF - nC) which is considerably reduced, by comparison, with the normal partial dispersion, as calculated from the Abbe equation
Pg,F = 0.6438 - 0.001682vd
and set forth, for example, in the Jenaer Glaswerk Schott & Gen. catalogue for optical glass no. 3050/1966/II 5.
Prior art glasses within the optical positional range of LaC and LaF glasses are characterized by the passage of a straight line through each of the following limiting values (as illustrated in FIG. 1):
______________________________________nd = 1.642 vd = 58.0 to nd = 1.699 vd = 46.0nd = 1.642 vd = 58.0 to nd = 1.652 vd = 58.5nd = 1.652 vd = 58.5 to nd = 1.702 vd = 54.6nd = 1.702 vd = 54.6 to nd = 1.742 vd = 44.0nd = 1.742 vd = 44.0 to nd = 1.699 vd = 46.0______________________________________
Each of these prior art glasses exhibit particularly low Pg,F values.
Glasses having the lowest Pg,F values and most extreme optical positions (e.g. nd =1.697; vd =55.4) consist essentially of B2 O3, CaO, La2 O3, ZrO2 and less than 10 percent by weight of SiO2. In addition to these ingredients, these glasses can also contain MgO, SrO, PbO, ZnO, CdO, TiO2, Al2 O3, Nb2 O5, and WO3 for varying the nd and vd values and for improving the crystallization stability and chemical resistivity of the glasses.
In prior art glasses, when the SiO2 content was raised to above 10 percent by weight, with a corresponding reduction in the amount of B2 O3 present, the optical positional range became smaller and hence an increase in the crystallization tendency and a lowering of the vd value with a given nd value of the glass occurred. One attempt to avoid the tendency of the glass to crystallize was to partially replace CaO and La2 O3 with BaO and ThO2, respectively. However, this attempt was not successful because the vd was considerably low and the Pg,F values were also considerably below the aforementioned normal partial dispersion value. A need therefore has existed for optical glasses having the same optical position as LaC and LaF glasses but with higher partial dispersion Pg,F than prior known glasses of the same optical position.
OBJECTS OF THE INVENTION
It is therefore a significant object of this invention to provide optical glasses having an improved varying partial dispersion in the optical positional range of lanthanum crown glasses and lanthanum flint glasses.
Another object of this invention is to provide optical glasses having a very good stability with respect to changes in climatic conditions.
Still another object of this invention is the provision of optical glass that can be ground, polished and pressed like ordinary silicate glasses.
It is a further object of this invention to provide optical glasses which exhibit a low susceptibility to staining.
A still further object of this invention is the provision of a composition for the production of optical glasses having an enlarged optical glass range without having the drawback of an appreciable reduction in the Pg,F value.
BRIEF SUMMARY OF THE INVENTION
Briefly, the invention relates to optical glasses containing barium borosilicate and having a varying partial dispersion Pg,F [(ng - nf)/(nF - nC)] in the optical positional range of LaC and LaF glasses wherein the amount of SiO2 present in the glass satisfies the following condition: ##EQU1## is at least 0.62 and the content of fluorine is at least 7 grams per 100 cc of glass.
DETAILED DESCRIPTION OF THE INVENTION
The compositions of the glasses according to the invention consist essentially of the following materials:
______________________________________ EquivalentOxide % by wt. or Oxides %______________________________________SiO2 20-26 26-31 Si1/2 O 42-53 60-66B2 O3 2-8.0 B2/3 O 5-20BaO 20-38 BaO 9-18MgO 0-6 25-40 MgO 0-5 10-22CaO 0-18 CaO 0-10SrO 0-18 SrO 0-10Ba2 O3 20-32 Ba2/3 O 10-20Y2 O3 0-25 20-32 Y2/3 O 0-20 10-23ThO2 0-18 Th1/2 O 0-12______________________________________
The above compositions further comprise at least 2 weight percent or 5 equivalent percent and preferably from 2 to 7 weight or 5 to 20 equivalent percent of F2 -O. Thus, in a fictitious purely oxidic glass of the above composition range, so much oxygen is to be replaced by 2 fluorine atoms that the increased weight amounts to 2 to 7 grams per 100 grams of oxidic glass. In an analagous manner, F2 -O is from 5 to 20 equivalent percent which means that 5 to 20 percent of the oxygen are replaced by an equivalent amount of fluorine.
The fluorine content of the glass can be introduced into each compound which is normally employed in the glass-melting art. For example, the fluorine can be introduced by using such compounds as BaF2, LaF2, ThF4, BaSiF6, etc.
In order to adjust the required nd and vd values, up to 12 equivalent percent of one or more of the following ingredients can be used:
divalent components, e.g., ZnO, PbO and CdO;
tetravalent components, e.g., TiO2 and ZrO2 ;
pentavalent components, e.g., Nb2 O5 and Ta2 O5 ; and
hexavalent components, e.g., WO3 and MO3.
The total content of the above-identified highly refracting, weakly or moderately dispersing constituents including La2 O3, ThO2 BaO, SrO, CaO, ZnO, Ta2 O5, Nb2 O5 and ZrO2, is to amount to at least 29 equivalent percent or 60 weight percent, Y2 O3 can be used as a substitute for La2 O3, either is whole or in part. Preferably, up to 25 percent by weight of La2 O3 are replaced by Y2 O3.
Similarly, in order to adjust the required optical positions and improve the crystallization stability of the optical glasses of this invention having the components BaO, La2 O3 and ThO2, portions of the latter components can be replaced by one or more of the following highly refracting, weakly or moderately dispersing components:
______________________________________ weight percent______________________________________CaO 0 - 18SrO 0 - 18ZnO 0 - 10Y2 O3 0 - 25ZrO2 0 - 7Ta2 O5 0 - 12Nb2 O5 0 - 12______________________________________
When more strongly dispersing components, e.g., MgO, PbO, CdO, Al2 O3, TiO2 and WO3, are added to the glasses in order to adjust a required optical position and for crystallization stability, generally up to 8 equivalent percent is utilized.
From 0 to 2 equivalent percent of As2 O3, Sb2 O3, NaCl, NH4 NO3, alkali silicofluorides, etc. can be used as refining agents in the practice of this invention. A preferred refining agent is As2 O3 which is preferably used in an amount of 0.3 weight percent of the total composition.
Represented in Tables 1 and 2 are examples of the optical glasses in accordance with the invention. The various ingredients are set forth in terms of percentage by weight as well as equivalent percent.
TABLE 1__________________________________________________________________________[Compositions in Equivalent Percent] 1 2 3 4 5 6 7 8 9 10__________________________________________________________________________Si1/2 O 50.8 50.2 44.2 49.4 50.2 51.6 50.6 50.8 51.3 50.1B2/3 O 14.6 14.4 19.3 14.3 14.4 14.9 14.5 14.5 14.6 14.2MgO -- -- -- 3.1 -- -- -- -- -- --CaO -- -- -- -- -- -- -- -- -- --SrO -- -- -- -- 3.5 -- -- -- -- --BaO 15.3 13.4 10.9 14.3 12.9 13.1 14.0 15.4 14.7 13.6PbO -- -- -- -- -- -- -- 2.0 3.2 --ZnO -- -- -- -- -- -- -- -- -- 5.1CaO -- -- -- -- -- -- -- -- -- --La.sub. 2/3 O 16.2 16.9 18.3 15.9 16.0 15.2 13.8 14.2 13.1 14.0Y2/3 O -- -- -- -- -- -- -- -- -- --Al2/3 O -- -- -- -- -- -- -- -- -- --Zr1/2 O -- -- -- -- -- -- -- -- -- --Ti1/2 O -- -- -- -- -- -- -- -- -- --Tb1/2 O 3.1 5.1 7.3 3.0 3.0 5.2 7.1 3.1 3.1 3.0Nb2/5 O -- -- -- -- -- -- -- -- -- --Ta2/5 O -- -- -- -- -- -- -- -- -- --W1/3 O -- -- -- -- -- -- -- -- -- --total 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0F2 --O 15.3 13.4 10.9 15.2 15.5 13.1 14.1 9.3 9.4 9.3As2 O3 (refining agent) 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 ##STR1## 0.78 0.78 0.70 0.77 0.78 0.77 0.78 0.78 0.78 0.78highly retractive weakly 34.6 35.4 36.5 33.2 35.4 33.5 34.9 32.7 42.2 35.7dispersing substancesstrongly disp. substances 0 0 0 3.1 0 0 0 6.8 3.2 0 11 12 13 14 15 16 17 18 19__________________________________________________________________________Si1/2 O 43.7 51.2 50.2 48.6 43.2 50.3 49.4 50.8 49.6B2/3 O 19.1 14.4 14.0 13.6 18.8 14.5 14.5 14.5 14.3MgO -- -- -- -- -- -- -- -- --CaO -- -- -- -- -- -- -- -- --SrO -- -- -- -- -- -- -- -- --BaO 10.8 15.6 13.9 13.0 10.6 15.3 14.4 14.4 15.1PbO -- -- -- -- -- -- -- 0.3 --ZnO -- -- -- -- -- -- -- 0.3 --CaO -- -- -- -- -- -- -- -- --La2/3 O 15.8 7.5 15.6 15.7 15.6 16.2 16.1 16.2 15.8Y2/3 O 3.4 8.2 -- -- -- -- -- -- --Al2/3 O -- -- -- -- -- -- -- -- --Zr1/2 O -- -- 6.3 -- -- -- -- 0.5 --Ti1/2 O -- -- -- 7.9 -- -- -- -- 3.1Th1/2 O 7.2 3.1 -- 1.2 7.1 2.1 3.1 3.1 2.1Nb2/5 O -- -- -- -- 4.7 -- 2.5 -- --Ta2/5 O -- -- -- -- -- -- -- -- --W1/3 O -- -- -- -- -- 1.6 -- -- --total 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0F2 -O 6.2 9.4 9.0 9.0 6.2 15.2 14.4 14.4 15.0As2 O3 (refining agent) 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 ##STR2## 0.70 0.78 0.78 0.78 0.70 0.78 0.77 0.78 0.78highly refractive weakly 37.2 34.4 35.9 29.9 38.0 33.6 36.1 34.6 33.0dispersing substancesstrongly disp. substances 0 0 0 7.9 0 1.6 0 0.3 3.1 20 21 22 23 24 25 26 27 28__________________________________________________________________________Si1/2 O 49.8 49.4 50.9 43.0 41.4 42.9 41.9 44.6 41.5B2/3 O 13.9 14.3 14.5 18.8 19.0 18.8 18.3 19.5 18.1MgO -- -- -- -- -- -- -- -- --CaO -- -- -- -- -- -- -- -- --SrO -- -- 5.1 -- -- -- -- -- --BaO 13.8 13.2 10.2 10.5 10.7 10.6 10.2 11.0 10.2PbO -- -- -- -- -- 0.6 -- -- --ZnO -- -- -- -- -- -- -- -- --CaO -- -- -- -- -- -- -- 5.2 --La2/3 O 15.5 16.0 16.3 17.9 18.1 17.8 13.5 12.3 11.6Y2/3 O -- -- -- -- -- -- -- -- --Al2/3 O -- -- -- 1.0 -- -- -- -- --Zr1/2 O 5.9 -- -- 0.5 -- -- -- -- --Ti1/2 O -- 5.0 -- 0.8 -- 3.2 -- -- --Th1/2 O 1.1 2.1 3.0 7.1 5.7 6.1 6.9 7.3 6.9Nb2/5 O -- -- -- -- 4.9 -- 9.1 -- --Ta2/5 O -- -- -- -- -- -- -- -- --W1/3 O -- -- -- -- -- -- -- -- --total 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0F2 --O 8.9 9.2 9.3 10.5 10.7 10.6 6.0 11.0 10.2As2 O3 (refining agent) 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 ##STR3## 0.78 0.77 0.78 0.70 0.68 0.69 0.70 0.70 0.70highly refractive weak 36.3 31.3 34.6 36.0 39.4 34.5 39.7 30.6 40.4dispersing substancesstrongly disp. subst. 0 5.0 0 2.2 0 3.2 0 5.2 0__________________________________________________________________________
TABLE 2__________________________________________________________________________TABLE 2 [Compositions in Weight Percent] 1 2 3 4 5 6 7 8 9 10__________________________________________________________________________SiO2 23.9 23.5 20.8 23.8 23.8 24.9 23.6 23.2 23.2 24.2B2 O3 5.3 5.2 7.0 5.3 5.3 5.5 5.2 5.1 5.1 5.3MgO -- -- -- 2.0 -- -- -- -- -- --CaO -- -- -- -- -- -- -- -- --SrO -- -- -- -- 5.7 -- -- -- --BaO 36.7 32.0 26.7 34.9 31.3 2.2 33.4 35.4 33.4 33.0PbO -- -- -- -- -- -- -- 6.8 10.8 --ZnO -- -- -- -- -- -- -- -- -- 6.6CdO -- -- -- -- ' -- -- -- -- --La2 O3 27.7 28.6 31.1 27.7 27.6 26.4 23.1 3.4 21.4 24.5Y2 O3 -- -- -- -- -- -- -- -- -- --Al2 O3 -- -- -- -- ' -- -- -- -- --ZrO2 -- -- -- -- -- -- -- -- -- --TiO2 -- -- -- -- -- -- -- -- -- --ThO2 6.4 10.5 15.0 6.3 6.3 11.0 14.7 6.1 6.1 6.4Nb2 O5 -- -- -- -- -- -- -- -- -- --Ta2 O5 -- -- -- -- -- -- -- -- -- --WO3 -- -- -- -- -- -- -- -- -- --F2 -O 5.3 4.6 3.7 5.4 5.3 4.6 4.8 2.9 2.9 3.1total 105.3 104.6 103.7 105.4 105.3 104.6 104.8 102.9 102.9 103.1As2 O3 (refining agent) 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3highly refractive weaklydispersing substances 0.8 17.3 72.2 68.9 71.9 69.6 71.2 64.9 60.9 70.5strongly disp. subst. 0 0 0 2.0 0 0 0 6.8 10.8 0md 7.6560 1.6764 1.6906 1.64683 1.65726 1.66801 1.67060 1.68076 1.68369 1.66480yd 58.08 56.32 55.47 57.95 57.36 56.54 56.81 51.22 49.19 55.49ng -n6nf -nC 0.5491 0.5502 0.5504 0.5405 0.5500 0.5518 0.5498 0.5590 0.5600 0.5508ng -ncnf -nC 1.0067 1.0102 1.0104 1.0091 1.0109 1.0119 1.0098 1.0216 1.2059 1.0110__________________________________________________________________________ 11 12 13 14 15 16 17 18 19__________________________________________________________________________NiO2 20.8 25.3 24.9 24.7 20.8 23.8 23.4 23.8 23.8B2 O3 7.0 5.5 5.4 5.5 7.0 5.3 5.3 5.3 5.3MgO -- -- -- -- -- -- -- -- --CHO -- -- -- -- -- -- -- -- --SiO -- -- -- -- -- -- -- -- --BaO 26.1 39.0 35.2 33.1 26.1 37.0 35.0 34.0 37.1PbO -- -- -- -- -- -- -- 1.1 --ZnO -- -- -- -- -- -- -- 0.5 --CnO -- -- -- -- -- -- -- -- --Na2 O3 27.1 13.3 28.1 28.8 27.1 27.6 27.7 27.6 27.5Y2 O3 4.0 10.1 -- -- -- -- -- -- --Al2 O3 -- -- -- -- -- -- -- -- --ZPO2 -- -- 6.4 -- -- -- -- 0.5 --TiO2 -- -- -- 5.3 -- -- -- -- 2.0ThO2 15.0 6.8 -- 2.6 15.0 4.4 6.5 6.3 4.3Nb2 O5 -- -- -- -- 4.0 -- 2.1 -- --Ta2 O5 -- -- -- -- -- -- -- -- --WO3 -- -- -- -- -- 1.9 -- -- --F2 -O 2.2 3.2 3.3 3.2 2.3 5.3 5.0 5.0 5.3total 102.2 103.2 103.3 103.2 102.3 105.3 105.0 105.0 105.3As2 O3 (refining agent)highly refractive weak 72.2 69.2 69.7 61.5 72.2 69.0 71.3 69.8 68.9dispersing substancesstrongly disp. subst. 0 0 0 5.3 0 1.9 0 1.1 2.0hd 1.70571 1.65876 1.67777 1.69932 1.21580 1.66717 1.66350 1.65717 1.67727vd 53.87 56.53 53.54 47.06 50.41 55.33 54.53 56.84 52.44Dg -Df 0.5512 0.5500 0.5521 0.5666 0.5564 0.5529 0.5531 0.5500 0.5572Nf -DcNg -NgNf -Nc 1.0112 4.0099 1.0126 1.0314 1.0189 1.0137 1.0139 1.0298 1.0192__________________________________________________________________________ 20 21 22 23 24 25 26 27 28 29__________________________________________________________________________SiO2 24.4 24.5 24.9 20.4 19.7 20.3 20.6 20.7 20.7 21.0B2 O3 5.3 5.5 5.5 6.9 7.0 6.9 6.9 7.0 7.0 6.1MgO -- -- -- -- -- -- -- -- -- --C2 O -- -- -- -- -- -- -- -- -- --SrO -- -- 8.6 -- -- -- -- -- -- --BaO 34.5 33.4 5.5 25.4 26.1 5.6 25.8 26.1 6.1 26.8PbO -- -- -- -- -- -- -- -- -- --ZnO -- -- -- -- -- -- -- -- -- --CdO -- -- -- -- -- -- 10.4 -- --La2 O3 27.5 28.7 28.9 30.5 31.1 30.5 23.9 20.8 20.8 30.4Y2 O3 -- -- -- -- -- -- -- -- -- --Al2 O3 -- -- -- 0.5 -- -- -- -- -- --ZrO2 6.0 -- -- 0.5 -- -- -- -- -- --TiO2 -- 3.3 -- 0.5 -- 2.0 -- -- -- --ThO2 2.3 4.6 6.6 14.8 11.9 12.7 14.9 15.0 15.0 0.2Nb2 O5 -- -- -- -- 4.2 -- 7.9 -- 10.14 --Ta2 O5 -- -- -- -- -- -- -- -- -- 5.5WO3 -- -- -- 0.5 -- -- -- -- --F2 -O 3.2 3.3 3.2 3.6 3.7 3.7 2.2 3.7 3.7 5.6total 103.2 103.3 103.2 103.6 103.7 103.7 102.2 103.7 103.7 05.6As2 O3 (refining agent) 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3highly refractive weaklydispersing substances 70.3 66.7 69.6 71.2 73.3 68.8 72.5 61.9 72.3 72.9strongly disp. substances 0 3.3 0 1.5 0 4.0 0 10.4 0 0nd 1.67621 1.68671 1.66573 1.69690 1.71202 1.70668 1.73292 1.70976 1.74243 1.68816vd 53.92 50.72 56.42 53.61 50.60 50.05 46.71 51.66 44.58 53.76ng -nF 0.5513 0.5607 0.5501 0.5530 0.5571 0.559 0.5620 0.5546 0.5656 0.5531ng -nenF -nC 1.0120 1.0238 1.0102 1.0139 1.0192 1.0227 1.0255 1.0160 1.0302 1.0142__________________________________________________________________________
Reference is also made to the attached figures. FIG. 1 shows the optical positional range of the glasses in accordance with the invention. FIG. 2 shows the dependence of (ng - nf)/(nF - nc) = Pg,F on (nd -1)/(nF -nC) = vd of known glasses and of the glasses according to the invention. In FIG. 2, both glasses of this invention as well as glasses of the prior art have the same optical position, but the glasses of this invention are shown to exhibit higher partial dispersion Pg,F than the prior art glasses. In these figures, the crosses indicate the glasses according to the inventon. The other markings correspond to commercial LaC and LaF glasses, which are to be found in the 1966 Schott catalogue and 1968 Min catalogue with the indicated numberings.
ILLUSTRATIVE EXAMPLES
The following examples are given by way of illustration of this invention only, and should not be construed as being in any way limiting upon the scope thereof. All percentages are by weight, unless specified to the contrary.
In the production of glass according to each of these examples, the following procedure was used.
The initial materials are well-mixed. The batch is melted at 1460° to 1480° C. in a platinum crucible and refined for two hours at 1520° C. Thereafter the temperature is lowered and stirring takes place from 1420° to 1030° C. The puring takes place at about 980° C. into a preheated casting mold. The reproducibility of the optical values is guaranteed by a melting assembly which is closed as tightly as possible, particularly so that the vaporization of the fluorine can be kept under control and influence the properties of the final melt product.
EXAMPLE 1
The following initial materials were used:
______________________________________ Weighed quantity for 4.6 kg. melt in grams______________________________________SiO2 921.1H3 BO3 549.6BaF2 1329.1La2 O3 1395.7ThO2 668.3As2 O3 13.8______________________________________
thus producing a charge for a 4.6 kg. melt having the following proportions:
______________________________________ Percent by Weight______________________________________SiO2 20.75B2 O3 7.00BaO 26.08La2 O3 31.12ThO2 15.05Total Oxides: 100.00 percentF2 -O 3.74 (increase in Weight due to oxygen replaced by fluorine)As2 O3 (refining agent) 0.30______________________________________
EXAMPLE 2
The following initial materials were used:
______________________________________ Weighed quantity for 4.6 kg. melt in grams______________________________________SiO2 1133.6H3 BO3 449.4BaCO3 308.4Ba(NO3)2 394.5BaF2 1228.2La2 O3 1338.2TiO2 244.8ThO2 119.8As2 O3 13.8______________________________________
thus producing a charge for a 4.6 kg. melt having the following proportions:
______________________________________ Percent by Weight______________________________________SiO2 24.6B2 O3 5.3BaO 33.5La2 O3 28.8TiO2 5.2ThO2 2.6Total Oxides: 100.0F2 -O 3.3Overall Total: 103.3As2 O3 (refining agent): 0.3______________________________________
Having now discussed in considerable detail illustrative and preferred embodiments of the invention, it should be apparent that the objects set forth at the outset of this specification have been satisfied.
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