Optical glass, glass preform, optical element, and optical instrument

Abstract

The present application provides an optical glass, which contains, in terms of weight percentage, SiO2: 1-15%; B2O3: 2-18%; La2O3: 35-65%; Y2O3: 5-25%; ZrO2: 2-15%; Nb2O5: 1-15%; TiO2: 5-20%, and the refractive index n d of the optical glass is 1.96 or more. Through reasonable component design, the optical glass obtained by the present application has a desired refractive index and Abbe number, and has a lower density, meeting the lightweight use of optical instruments.

Description

Technical Field

[0001] This invention relates to an optical glass, and more particularly to an optical glass with a refractive index of 1.96 or higher and an Abbe number of 34 or lower, as well as glass preforms, optical elements and optical instruments made therefrom. Background Technology

[0002] In recent years, the digitization of optical instruments and the high-definition of images and videos have been developing rapidly. The high-definition of images and videos is particularly prominent in optical instruments such as digital cameras, camcorders, and projectors. At the same time, the optical systems contained in these instruments are being optimized for weight reduction and miniaturization by reducing the number of optical components such as lenses or prisms.

[0003] For the same radius of curvature, glass with a higher refractive index yields a larger imaging field of view, which is beneficial for reducing the number of optical components in optical instruments. With the trend towards miniaturization in optical instruments, the demand for high-refractive-index glass is becoming increasingly apparent. To achieve lightweight optical instruments, in addition to reducing the number of optical components in the optical system, reducing the density of optical glass is also an important approach. CN101734855A discloses a high-refractive-index optical glass with a refractive index greater than 1.95 and less than or equal to 2.20 and a dispersion coefficient of 15–25. However, its high density is not conducive to further achieving lightweight optical instruments. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an optical glass with a refractive index of 1.96 or higher, an Abbe number of 34 or lower, and a low density.

[0005] The technical solution adopted by this invention to solve the technical problem is:

[0006] Optical glass, the composition of which is expressed as a weight percentage, contains: SiO2: 1-15%; B2O3: 2-18%; La2O3: 35-65%; Y2O3: 5-25%; ZrO2: 2-15%; Nb2O5: 1-15%; TiO2: 5-20%, and the refractive index n of the optical glass is given. d It is above 1.96.

[0007] Furthermore, the optical glass, whose composition is expressed as a weight percentage, also contains: Gd2O3: 0-10%; and / or Ta2O5: 0-5%; and / or RO: 0-10%; and / or Rn2O: 0-8%; and / or WO3: 0-5%; and / or ZnO: 0-10%; and / or Al2O3: 0-8%; and / or Yb2O3: 0-10%; and / or GeO2: 0-5%; and / or clarifying agent: 0-2%, wherein the RO is one or more of MgO, CaO, SrO, and BaO, the Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifying agent is one or more of Sb2O3, SnO, SnO2, and CeO2.

[0008] Optical glass, the composition of which is expressed as a weight percentage, is as follows: SiO2: 1-15%; B2O3: 2-18%; La2O3: 35-65%; Y2O3: 5-25%; ZrO2: 2-15%; Nb2O5: 1-15%; TiO2: 5-20%; Gd2O3: 0-10%; Ta2O5: 0-5%; RO: 0-10%; Rn2O: 0-8%; WO3: 0-5%. ZnO: 0-10%; Al2O3: 0-8%; Yb2O3: 0-10%; GeO2: 0-5%; clarifying agent: 0-2% composition, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifying agent is one or more of Sb2O3, SnO, SnO2, and CeO2, and the refractive index n of the optical glass is... d It is above 1.96.

[0009] Furthermore, the composition of the optical glass is expressed as a weight percentage, wherein: La2O3+Y2O3+Gd2O3 is 45-75%, preferably La2O3+Y2O3+Gd2O3 is 50-75%, and more preferably La2O3+Y2O3+Gd2O3 is 55-70%.

[0010] Furthermore, the composition of the optical glass is expressed as a weight percentage, wherein: SiO2+B2O3 is 5-30%, preferably 8-25%, and more preferably 10-20%.

[0011] Furthermore, the composition of the optical glass is expressed as a weight percentage, wherein: (La2O3+TiO2) / Nb2O5 is 3.0 to 30.0, preferably (La2O3+TiO2) / Nb2O5 is 4.0 to 25.0, more preferably (La2O3+TiO2) / Nb2O5 is 5.0 to 20.0, and even more preferably (La2O3+TiO2) / Nb2O5 is 5.5 to 15.0.

[0012] Furthermore, the composition of the optical glass is expressed as a weight percentage, wherein: Nb2O5 / Y2O3 is 0.1 to 2.0, preferably 0.2 to 1.5, more preferably 0.3 to 1.3, and even more preferably 0.3 to 1.0.

[0013] Furthermore, the optical glass comprises, by weight percentage, Y2O3 / TiO2 of 0.3 to 3.0, preferably 0.4 to 2.0, more preferably 0.5 to 1.5, and even more preferably 0.7 to 1.3.

[0014] Furthermore, the composition of the optical glass is expressed as a weight percentage, wherein: (Nb2O5+WO3+Gd2O3) / TiO2 is 0.1 to 3.0, preferably (Nb2O5+WO3+Gd2O3) / TiO2 is 0.2 to 2.5, more preferably (Nb2O5+WO3+Gd2O3) / TiO2 is 0.3 to 2.0, and even more preferably (Nb2O5+WO3+Gd2O3) / TiO2 is 0.4 to 1.5.

[0015] Furthermore, the optical glass comprises, by weight percentage, (RO+ZnO) / Y2O3 of 1.0 or less, preferably (RO+ZnO) / Y2O3 of 0.8 or less, more preferably (RO+ZnO) / Y2O3 of 0.5 or less, and even more preferably (RO+ZnO) / Y2O3 of 0.2 or less, wherein RO is one or more of MgO, CaO, SrO, and BaO.

[0016] Furthermore, the optical glass comprises, by weight percentage, (RO+Gd2O3) / Y2O3 of 1.0 or less, preferably (RO+Gd2O3) / Y2O3 of 0.8 or less, more preferably (RO+Gd2O3) / Y2O3 of 0.6 or less, and even more preferably (RO+Gd2O3) / Y2O3 of 0.3 or less, wherein RO is one or more of MgO, CaO, SrO, and BaO.

[0017] Furthermore, the composition of the optical glass is expressed as a weight percentage, wherein: (WO3+TiO2) / Y2O3 is 0.3 to 3.0, preferably (WO3+TiO2) / Y2O3 is 0.4 to 2.5, more preferably (WO3+TiO2) / Y2O3 is 0.5 to 2.0, and even more preferably (WO3+TiO2) / Y2O3 is 0.7 to 1.5.

[0018] Furthermore, the composition of the optical glass is expressed as a weight percentage, wherein (SiO2+B2O3) / Y2O3 is 0.2 to 3.5, preferably (SiO2+B2O3) / Y2O3 is 0.4 to 3.0, more preferably (SiO2+B2O3) / Y2O3 is 0.5 to 2.5, and even more preferably (SiO2+B2O3) / Y2O3 is 0.7 to 1.8.

[0019] Furthermore, the optical glass comprises, in weight percentages, SiO2: 2-10%, preferably 4-9%; and / or B2O3: 4-12%, preferably 5-10%; and / or La2O3: 40-60%, preferably 42-55%; and / or Y2O3: 6-20%, preferably 8-18%, more preferably 8-15%; and / or ZrO2: 3-12%, preferably 4-10%; and / or Nb2O5: 3-12%, preferably 5-10%; and / or Ta2O5: 0-3%, preferably 0-1%; and / or Gd2O3: 0-6%, preferably 0-4%; and / or TiO2: 6-18%, preferably 8-9%; 15; and / or RO: 0-5%, preferably RO: 0-2%; and / or Rn2O: 0-3%, preferably Rn2O: 0-2%; and / or WO3: 0-3%, preferably WO3: 0-2%; and / or ZnO: 0-5%, preferably ZnO: 0-2%; and / or Al2O3: 0-4%, preferably Al2O3: 0-2%; and / or Yb2O3: 0-5%, preferably Yb2O3: 0-2%; and / or GeO2: 0-3%, preferably GeO2: 0-1%; and / or clarifying agent: 0-1%, preferably clarifying agent: 0-0.5%, wherein the RO is one or more of MgO, CaO, SrO, and BaO, the Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifying agent is one or more of Sb2O3, SnO, SnO2, and CeO2.

[0020] Furthermore, the optical glass, whose composition is expressed as a weight percentage, has a total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 of 90% or more, preferably 92% or more, more preferably 94% or more, and even more preferably 96% or more.

[0021] Furthermore, the optical glass described herein does not contain Ta2O5; and / or WO3; and / or Yb2O3; and / or RO; and / or Rn2O; and / or ZnO; and / or Al2O3; and / or GeO2, wherein RO is one or more of MgO, CaO, SrO, and BaO, and Rn2O is one or more of Li2O, Na2O, and K2O.

[0022] Furthermore, the refractive index n of the optical glass... d The Abbe number is 1.97 or higher, preferably 1.98 or higher, more preferably 1.99 or higher, and even more preferably 1.99 to 2.02; d The value is 23 to 34, preferably 25 to 33, more preferably 26 to 32, and even more preferably 27 to 31.

[0023] Furthermore, the density ρ of the optical glass is 5.20 g / cm³. 3 The preferred value is 5.10 g / cm³. 3 The following is more preferably 5.00 g / cm³. 3 The following; and / or the coefficient of thermal expansion α -30 / 70℃ 85×10 -7 / K or less, preferably 80×10 -7 / K or less, preferably 75×10 -7 / K or below; and / or water resistance stability D W It is classified as Class 2 or above, preferably Class 1; and / or acid resistance stability D A The weather resistance (CR) is 2 or more, preferably 1; and / or the weather resistance (CR) is 2 or more, preferably 1; and / or the Knoop hardness (H) is... K 670×10 7 Pa or higher, preferably 680 × 10 Pa 7 Pa or higher, more preferably 690 × 10 Pa. 7 Pa or above; and / or Young's modulus E is 11500 × 10⁻⁶.7 Pa ~ 15500 × 10 7 Pa, preferably 12000 × 10 7 Pa ~ 15000 × 10 7 Pa, more preferably 12500 × 10 7 Pa ~ 14500 × 10 7 Pa, more preferably 13000 × 10 7 Pa ~ 14000 × 10 7 Pa; and / or a bubble degree of A or above, preferably A0 or above, more preferably A 00 Grade; and / or wear degree F A The value is 80-125, preferably 85-115, and more preferably 90-105.

[0024] The glass preform is made of the aforementioned optical glass.

[0025] The optical element is made of the optical glass described above, or of the glass preform described above.

[0026] An optical instrument containing the aforementioned optical glass and / or containing the aforementioned optical elements.

[0027] The beneficial effects of this invention are: through reasonable component design, the optical glass obtained by this invention has a low density while having the desired refractive index and Abbe number, which meets the requirements for lightweight optical instruments. Detailed Implementation

[0028] The embodiments of the optical glass of the present invention will now be described in detail. However, the present invention is not limited to the embodiments described below, and appropriate modifications can be made to implement it within the scope of the purpose of the present invention. Furthermore, regarding repeated descriptions, although there are appropriate omissions, this will not limit the spirit of the invention. In the following text, the optical glass of the present invention will sometimes be simply referred to as glass.

[0029] Optical Glass

[0030] The composition range of each component in the optical glass of the present invention will be described below. In the present invention, unless otherwise specified, the content of each component and the total content are all expressed as a weight percentage (wt%), that is, the weight percentage of the content of each component and the total content relative to the total amount of glass material converted into oxide composition. Here, "converted into oxide composition" means that when the oxides, complex salts, and hydroxides used as raw materials for the optical glass of the present invention decompose and transform into oxides upon melting, the total amount of such oxides is taken as 100%.

[0031] Unless otherwise specified in the specific context, the numerical ranges listed in this invention include upper and lower limits, and "above" and "below" include endpoint values ​​and all integers and fractions included in the range, but are not limited to the specific values ​​listed when the range is defined. The term "and / or" as used herein is inclusive; for example, "A and / or B" means only A, or only B, or both A and B.

[0032] <Essential and Optional Components>

[0033] B2O3 is a glass network-forming component that improves glass fusibility and devitrification resistance, and lowers glass transition temperature and density. This invention achieves these effects by containing 2% or more B2O3, preferably 4% or more, and more preferably 5% or more. However, if its content exceeds 18%, the stability of the glass decreases, and the refractive index decreases, making it difficult to achieve the high refractive index of this invention. Therefore, the maximum B2O3 content in this invention is 18%, preferably 12%, and more preferably 10%.

[0034] SiO2 is also a network-forming component, which can adjust the coefficient of thermal expansion of glass, improve its resistance to devitrification and chemical stability, and also improve its thermal stability and high-temperature viscosity. However, if its content exceeds 15%, the melting properties of the glass tend to deteriorate and the transition temperature increases. Therefore, the SiO2 content in this invention is 1-15%, preferably 2-10%, and more preferably 4-9%.

[0035] In some embodiments, by controlling the total content of SiO2 and B2O3 (SiO2+B2O3) within the range of 5-30%, the abrasion resistance and weather resistance of the glass can be optimized while maintaining the stability of glass formation, and the devitrification resistance of the glass can be prevented from decreasing. Therefore, it is preferable that the content of SiO2+B2O3 is 5-30%, more preferably 8-25%, and even more preferably 10-20%.

[0036] La2O3 is an effective component for improving the refractive index of glass, and it has a significant effect on improving the chemical stability and devitrification resistance of glass. If its content is less than 35%, it is difficult to achieve the required optical constant; if the content is higher than 65%, the glass's devitrification tendency increases and its thermal stability deteriorates. Therefore, the content of La2O3 is limited to 35-65%, preferably 40-60%, and more preferably 42-55%.

[0037] Y₂O₃ can improve the refractive index and devitrification resistance of glass, and adjust the Young's modulus of glass. This invention achieves the above effects by containing more than 5% Y₂O₃; if its content exceeds 25%, the chemical stability and weather resistance of the glass deteriorate. Therefore, the Y₂O₃ content in this invention is 5-25%, preferably 6-20%, more preferably 8-18%, and even more preferably 8-15%.

[0038] In some embodiments, controlling the ratio of the total SiO2 and B2O3 content (SiO2+B2O3) to the Y2O3 content (SiO2+B2O3) / Y2O3 within the range of 0.2 to 3.5 is beneficial for improving the bubble content of the glass and preventing an increase in the coefficient of thermal expansion. Therefore, it is preferable that (SiO2+B2O3) / Y2O3 is 0.2 to 3.5, more preferably 0.4 to 3.0. Furthermore, controlling (SiO2+B2O3) / Y2O3 within the range of 0.5 to 2.5 can further improve the hardness and weather resistance of the glass. Therefore, it is even more preferable that (SiO2+B2O3) / Y2O3 is 0.5 to 2.5, and even more preferably 0.7 to 1.8.

[0039] Gd₂O₃ can improve the refractive index and chemical stability of glass, but if its content exceeds 10%, the glass's resistance to devitrification and abrasion resistance deteriorates. Therefore, the content of Gd₂O₃ is 0–10%, preferably 0–6%, and more preferably 0–4%.

[0040] In some embodiments, by controlling the total content of La2O3, Y2O3, and Gd2O3 (La2O3+Y2O3+Gd2O3) within the range of 45-75%, the glass is more likely to achieve the desired refractive index and Abbe number, and the glass's resistance to devitrification and weathering is optimized. Therefore, a content of 45-75% La2O3+Y2O3+Gd2O3 is preferred, 50-75% is more preferred, and 55-70% is even more preferred.

[0041] Yb₂O₃ is also a component that imparts high refractive index and low dispersion to glass. If its content exceeds 8%, the glass's resistance to crystallization decreases. Therefore, the content of Yb₂O₃ is 0-10%, preferably 0-5%, more preferably 0-2%, and even more preferably does not contain Yb₂O₃.

[0042] ZrO2 can improve the viscosity, hardness, refractive index, and chemical stability of optical glass, and can also reduce the coefficient of thermal expansion of glass. However, when the ZrO2 content is too high, the glass's resistance to devitrification decreases, the melting difficulty increases, the melting temperature rises, and inclusions appear inside the glass, leading to a decrease in light transmittance. Therefore, the ZrO2 content in this invention is 2-15%, preferably 3-12%, and more preferably 4-10%.

[0043] TiO2 is a high-refractive-index and high-dispersion component that can significantly improve the refractive index and dispersion of glass. The inventors have found that an appropriate amount of TiO2 can increase the stability of glass; however, excessive TiO2 content significantly reduces the transmittance of the glass and deteriorates its chemical stability. Therefore, the TiO2 content in this invention is 5–20%, preferably 6–18%, and more preferably 8–15%.

[0044] In some embodiments, by controlling the ratio of Y₂O₃ content to TiO₂ content, Y₂O₃ / TiO₂, within the range of 0.3 to 3.0, the weather resistance of the glass can be improved and the abrasion resistance optimized. Therefore, a Y₂O₃ / TiO₂ ratio of 0.3 to 3.0 is preferred, and a Y₂O₃ / TiO₂ ratio of 0.4 to 2.0 is more preferred. Furthermore, controlling the Y₂O₃ / TiO₂ ratio within the range of 0.5 to 1.5 can further improve the chemical stability and bubble content of the glass. Therefore, a Y₂O₃ / TiO₂ ratio of 0.5 to 1.5 is even more preferred, and a Y₂O₃ / TiO₂ ratio of 0.7 to 1.3 is even more preferred.

[0045] Nb₂O₅ is a high-refractive-index and high-dispersion component that can improve the refractive index and devitrification resistance of glass, and reduce the coefficient of thermal expansion of glass. In this invention, the above effects are achieved by containing more than 1% Nb₂O₅, preferably with a lower limit of 3%, more preferably with a lower limit of 5%. If the Nb₂O₅ content exceeds 15%, the thermal stability and weather resistance of the glass decrease, and the light transmittance decreases. Therefore, the upper limit of the Nb₂O₅ content in this invention is 15%, preferably 12%, and more preferably 10%.

[0046] In some embodiments, by controlling the ratio of the total content of La2O3 and TiO2 (La2O3+TiO2) to the content of Nb2O5 (La2O3+TiO2) / Nb2O5 within the range of 3.0 to 30.0, the chemical stability of the glass can be improved and the abrasion resistance of the glass can be optimized. Therefore, it is preferable that (La2O3+TiO2) / Nb2O5 is 3.0 to 30.0, more preferably (La2O3+TiO2) / Nb2O5 is 4.0 to 25.0. Furthermore, controlling (La2O3+TiO2) / Nb2O5 within the range of 5.0 to 20.0 can further reduce the coefficient of thermal expansion of the glass and improve the hardness of the glass. Therefore, it is further preferable that (La2O3+TiO2) / Nb2O5 is 5.0 to 20.0, and even more preferably (La2O3+TiO2) / Nb2O5 is 5.5 to 15.0.

[0047] In some embodiments, controlling the ratio of Nb₂O₅ content to Y₂O₃ content, Nb₂O₅ / Y₂O₃, within the range of 0.1 to 2.0 can improve the Young's modulus of the glass while preventing a decrease in glass hardness. Therefore, an Nb₂O₅ / Y₂O₃ ratio of 0.1 to 2.0 is preferred, and an Nb₂O₅ / Y₂O₃ ratio of 0.2 to 1.5 is more preferred. Furthermore, controlling the Nb₂O₅ / Y₂O₃ ratio within the range of 0.3 to 1.3 can further optimize the bubble content and abrasion resistance of the glass. Therefore, an Nb₂O₅ / Y₂O₃ ratio of 0.3 to 1.3 is even more preferred, and an Nb₂O₅ / Y₂O₃ ratio of 0.3 to 1.0 is even more preferred.

[0048] Alkaline earth metal oxides (RO, which is one or more of MgO, CaO, SrO, and BaO) can adjust the optical constants of glass and optimize its chemical stability, but when their content is high, the glass's devitrification resistance decreases. Therefore, the RO content is limited to 0-10%, preferably 0-5%, and more preferably 0-2%. In some embodiments, it is further preferred that the glass does not contain RO.

[0049] In some embodiments, controlling the ratio of the total content of RO and Gd2O3 (RO+Gd2O3) to the content of Y2O3 (RO+Gd2O3) / Y2O3 to below 1.0 is beneficial for reducing the density of the glass, improving its chemical stability, and optimizing its Young's modulus and bubble content. Therefore, it is preferable that (RO+Gd2O3) / Y2O3 is below 1.0, more preferably below 0.8, further preferably below 0.6, and even more preferably below 0.3.

[0050] Alkali metal oxides Rn₂O (Rn₂O is one or more of Li₂O, Na₂O, and K₂O) can lower the glass transition temperature, adjust the optical constants and high-temperature viscosity of the glass, and improve the glass's meltability. However, when its content is high, the glass's resistance to devitrification and chemical stability decrease. Therefore, in this invention, the Rn₂O content is 0–8%, preferably 0–3%, and more preferably 0–2%. In some embodiments, it is further preferred that the glass does not contain Rn₂O.

[0051] WO3 can improve the refractive index and mechanical strength of glass. However, if the WO3 content exceeds 5%, the thermal stability and devitrification resistance of the glass decrease. Therefore, the upper limit of the WO3 content is 5%, preferably 3%, and more preferably 2%. In some embodiments, it is even more preferable that the glass does not contain WO3.

[0052] In some embodiments, controlling the ratio of the total content of Nb2O5, WO3, and Gd2O3 (Nb2O5+WO3+Gd2O3) to the TiO2 content (Nb2O5+WO3+Gd2O3) / TiO2 within the range of 0.1 to 3.0 can improve the light transmittance of the glass while preventing an increase in density. Therefore, it is preferable that (Nb2O5+WO3+Gd2O3) / TiO2 is 0.1 to 3.0, and more preferably (Nb2O5+WO3+Gd2O3) / TiO2 is 0.2 to 2.5. Furthermore, controlling (Nb2O5+WO3+Gd2O3) / TiO2 within the range of 0.3 to 2.0 can further reduce the coefficient of thermal expansion of the glass and increase Young's modulus. Therefore, it is further preferred that the ratio of (Nb2O5+WO3+Gd2O3) / TiO2 is 0.3 to 2.0, and even more preferred that the ratio of (Nb2O5+WO3+Gd2O3) / TiO2 is 0.4 to 1.5.

[0053] In some embodiments, controlling the ratio of the total content of WO3 and TiO2 (WO3+TiO2) to the content of Y2O3 (WO3+TiO2) / Y2O3 within the range of 0.3 to 3.0 is beneficial for improving the chemical stability of the glass and optimizing its wear resistance and Young's modulus. Therefore, it is preferable that (WO3+TiO2) / Y2O3 is 0.3 to 3.0, more preferably 0.4 to 2.5, further preferably 0.5 to 2.0, and even more preferably 0.7 to 1.5.

[0054] ZnO can adjust the refractive index and dispersion of glass, and reduce its high-temperature viscosity and transition temperature. However, if the ZnO content is too high, glass forming becomes more difficult, and its resistance to crystallization deteriorates. Therefore, the ZnO content is 0–10%, preferably 0–5%, and more preferably 0–2%. In some embodiments, it is further preferred that the glass does not contain ZnO.

[0055] In some embodiments, controlling the ratio of the total RO and ZnO content (RO+ZnO) to the Y2O3 content (RO+ZnO) / Y2O3 to below 1.0 can improve the weather resistance of the glass, optimize its abrasion resistance, and prevent the glass from becoming less bubble-prone and having a lower coefficient of thermal expansion. Therefore, it is preferable that (RO+ZnO) / Y2O3 is below 1.0, more preferably below 0.8, further preferably below 0.5, and even more preferably below 0.2.

[0056] Ta2O5 can improve the refractive index and enhance the devitrification resistance of glass, but if its content is too high, the thermal stability of the glass will decrease and the density will increase. On the other hand, compared with other components, Ta2O5 is very expensive. From the perspective of practicality and cost, its usage should be minimized. Therefore, the content of Ta2O5 in this invention is limited to 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that Ta2O5 is not present.

[0057] Al2O3 can improve the chemical stability of glass, but when its content exceeds 8%, the meltability and light transmittance of the glass deteriorate. Therefore, the content of Al2O3 in this invention is 0-8%, preferably 0-4%, and more preferably 0-2%. In some embodiments, it is further preferred that Al2O3 is not present.

[0058] GeO2 improves refractive index and devitrification resistance, but excessive content reduces the chemical stability of the glass. Furthermore, GeO2 is very expensive compared to other components, and its usage should be minimized from a practical and cost-effective perspective. Therefore, the GeO2 content in this invention is limited to 0-5%, preferably 0-3%, more preferably 0-1%, and even more preferably free of GeO2.

[0059] In this invention, one or more components selected from Sb₂O₃, SnO, SnO₂, and CeO₂ are used as clarifying agents to improve the clarification effect and bubble content of the glass. Preferably, the content of the clarifying agent is 0-1%, more preferably 0-0.5%. Because the optical glass of this invention has a reasonable design in terms of component types and content, resulting in excellent bubble content, it is further preferred in some embodiments to be free of clarifying agents. When the Sb₂O₃ content exceeds 2%, the glass tends to have reduced clarification performance. Simultaneously, its strong oxidizing effect promotes the corrosion of platinum or platinum alloy vessels used for molten glass and the deterioration of the forming mold. Therefore, in this invention, the Sb₂O₃ content is preferably 0-2%, more preferably 0-1%, further preferably 0-0.5%, and even more preferably free of Sb₂O₃. SnO and SnO₂ can also be used as clarifying agents, but when their content exceeds 2%, the tendency for glass coloring increases, or when the glass is heated, softened, and then molded, Sn becomes the starting point for crystal nucleation, leading to a tendency for devitrification. Therefore, the SnO2 content of the present invention is preferably 0-2%, more preferably 0-1%, further preferably 0-0.5%, and even more preferably free of SnO2; the SnO content is preferably 0-2%, more preferably 0-1%, further preferably 0-0.5%, and even more preferably free of SnO. The role and content ratio of CeO2 are the same as those of SnO2, and its content is preferably 0-2%, more preferably 0-1%, further preferably 0-0.5%, and even more preferably free of CeO2.

[0060] In some embodiments, to achieve a lower coefficient of thermal expansion and density, higher light transmittance and bubble level, and suitable wear resistance and Young's modulus in the optical glass of the present invention, the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 is preferably 90% or more; more preferably, the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 is 92% or more; even more preferably, the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 is 94% or more; and even more preferably, the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 is 96% or more.

[0061] <Components that should not be present>

[0062] In the glass of this invention, even if oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo are contained in small amounts, either alone or in combination, the glass will be colored and absorb at specific wavelengths in the visible light region, thereby weakening the property of this invention to improve visible light transmittance. Therefore, it is preferable that the glass does not contain these oxides, especially for optical glass where transmittance in the visible light region is required.

[0063] Oxides of Th, Cd, Tl, Os, Be, and Se have been increasingly subject to controlled use in recent years due to their status as hazardous chemicals. Environmental protection measures are essential not only in glass manufacturing but also in processing and post-product disposal. Therefore, given the importance of environmental impact, it is preferable to avoid the presence of these substances, except where their contamination is unavoidable. As a result, the optical glass becomes virtually free of pollutants. Therefore, the optical glass of this invention can be manufactured, processed, and disposed of even without special environmental countermeasures.

[0064] To achieve environmental friendliness, the optical glass of the present invention preferably does not contain As2O3 and PbO.

[0065] The terms "not containing" and "0%" as used herein mean that the compound, molecule, or element was not intentionally added to the optical glass of this invention as a raw material; however, as raw materials and / or equipment for producing optical glass, there may be certain impurities or components that are not intentionally added, which may be present in small or trace amounts in the final optical glass, and such cases are also within the scope of protection of this patent.

[0066] The performance of the optical glass of the present invention will now be described.

[0067] <Refractive Index and Abbe Number>

[0068] The refractive index (n) of optical glass d ) and Abbe number (ν d Test according to the method specified in GB / T 7962.1—2010.

[0069] In some embodiments, the refractive index (n) of the optical glass of the present invention d The lower limit is 1.96, the preferred lower limit is 1.97, the more preferred lower limit is 1.98, and the even more preferred lower limit is 1.99.

[0070] In some embodiments, the refractive index (n) of the optical glass of the present invention d The upper limit of ) is 2.10, the preferred upper limit is 2.05, and the more preferred upper limit is 2.02.

[0071] In some embodiments, the Abbe number (ν) of the optical glass of the present inventiond The lower limit of ) is 23, the preferred lower limit is 25, the more preferred lower limit is 26, and the even more preferred lower limit is 27.

[0072] In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The upper limit of ) is 34, the preferred upper limit is 33, the more preferred upper limit is 32, and the even more preferred upper limit is 31.

[0073] <Density>

[0074] The density (ρ) of optical glass was tested according to the method specified in GB / T7962.20-2010.

[0075] In some embodiments, the density (ρ) of the optical glass of the present invention is 5.20 g / cm³. 3 The preferred value is 5.10 g / cm³. 3 The following is more preferably 5.00 g / cm³. 3 the following.

[0076] <Coefficient of thermal expansion>

[0077] The coefficient of thermal expansion of optical glass (α) -30 / 70℃ Data for -30 to 70℃ were tested according to the method specified in GB / T7962.16-2010.

[0078] In some embodiments, the coefficient of thermal expansion (α) of the optical glass of the present invention is... -30 / 70℃ ) is 85×10 -7 / K or less, preferably 80×10 -7 / K or less, preferably 75×10 -7 / K or below.

[0079] <Stability under water resistance>

[0080] Water resistance stability of optical glass (D) W (Powder method) Tested according to the method specified in GB / T 17129.

[0081] In some embodiments, the water resistance stability (D) of the optical glass of the present invention is... W There are two or more categories, with category 1 being preferred.

[0082] <Stability under acid conditions>

[0083] Acid resistance stability of optical glass (D) A (Powder method) Tested according to the method specified in GB / T 17129.

[0084] In some embodiments, the acid resistance stability (D) of the optical glass of the present invention is...A There are two or more categories, with category 1 being preferred.

[0085] <Weather resistance>

[0086] The weather resistance (CR) test method for optical glass is as follows: The sample is placed in a test chamber with a relative humidity of 90% saturated water vapor, and the temperature is alternately cyclical every 1 hour at 40–50°C, for 15 cycles. Weather resistance is classified according to the change in turbidity before and after the sample placement. The weather resistance classification is shown in Table 1.

[0087] Table 1.

[0088]

[0089] In some embodiments, the weather resistance (CR) of the optical glass of the present invention is Class 2 or above, preferably Class 1.

[0090] Knoop Hardness

[0091] Knoop hardness (H) of optical glass K The test shall be conducted in accordance with the test method specified in GB / T7962.18-2010.

[0092] In some embodiments, the Knoop hardness (H) of the optical glass of the present invention is... K ) is 670×10 7 Pa or higher, preferably 680 × 10 Pa 7 Pa or higher, more preferably 690 × 10 Pa. 7 Pa or above.

[0093] Young's Modulus

[0094] Young's modulus (E) is obtained by ultrasonic testing of its longitudinal and transverse wave velocities, and then calculated using the following formula.

[0095]

[0096] G = V S 2 ρ

[0097] In the formula: E is Young's modulus, Pa;

[0098] G is the shear modulus, Pa;

[0099] V T The transverse wave velocity is in m / s;

[0100] V S The longitudinal wave velocity is given in m / s.

[0101] ρ is the density of glass, in g / cm³ 3 .

[0102] In some embodiments, the lower limit of the Young's modulus (E) of the optical glass of the present invention is 11500 × 10⁻⁶. 7 Pa, preferably with a lower limit of 12000 × 10 7 Pa, more preferably a lower limit of 12500 × 10 7 Pa, with a further preferred lower limit of 13000 × 10 7 Pa.

[0103] In some embodiments, the upper limit of the Young's modulus (E) of the optical glass of the present invention is 15500 × 10⁻⁶. 7 Pa, preferably with an upper limit of 15000×10 7 Pa, more preferably an upper limit of 14500 × 10 7 Pa, with a further optimized upper limit of 14000×10 7 Pa.

[0104] <wear level>

[0105] Abrasion resistance (F) of optical glass A The wear amount (volume) refers to the ratio of the wear amount of the test specimen to the wear amount (volume) of the standard specimen (H-K9 glass) under exactly the same conditions, multiplied by 100. The formula is as follows:

[0106] F A =V / V0×100=(W / ρ) / (W0 / ρ0)×100

[0107] Where: V—volume wear of the tested sample;

[0108] V0—Standard sample volume wear amount;

[0109] W—Mass wear of the tested sample;

[0110] W0—Standard sample mass wear amount;

[0111] ρ—Density of the sample being measured;

[0112] ρ0 — density of the standard sample.

[0113] In some embodiments, the abrasion degree (F) of the optical glass of the present invention A The lower limit is 80, the preferred lower limit is 85, and the more preferred lower limit is 90.

[0114] In some embodiments, the abrasion degree (F) of the optical glass of the present invention A The upper limit of ) is 125, the preferred upper limit is 115, and the more preferred upper limit is 105.

[0115] <Effervescence>

[0116] The bubble content of optical glass shall be tested according to the method specified in GB / T7962.8-2010.

[0117] In some embodiments, the bubble degree of the optical glass of the present invention is grade A or above, preferably grade A0 or above, and more preferably grade A. 00 class.

[0118] [Manufacturing methods for optical glass]

[0119] The manufacturing method of the optical glass of this invention is as follows: The glass of this invention is produced using conventional raw materials and processes, including but not limited to using oxides, hydroxides, complex salts (such as carbonates, nitrates, sulfates, etc.), boric acid, etc. as raw materials. After the raw materials are prepared according to conventional methods, the prepared furnace charge is put into a melting furnace (such as a platinum or platinum alloy crucible) at 1200-1450°C for melting. After clarification and homogenization, a homogeneous molten glass without bubbles and undissolved substances is obtained. This molten glass is then cast in a mold and annealed. Those skilled in the art can appropriately select raw materials, process methods, and process parameters according to actual needs.

[0120] [Glass preforms and optical components]

[0121] Glass preforms can be manufactured from the produced optical glass using methods such as direct drop forming, grinding, or hot pressing. Specifically, glass preforms can be manufactured by directly and precisely drop-forming molten optical glass into precision glass preforms, or by machining such as grinding and polishing, or by hot pressing a preform made from optical glass for compression molding followed by grinding. It should be noted that the methods for preparing glass preforms are not limited to the methods described above.

[0122] As described above, the optical glass of the present invention is useful for various optical components and optical designs. It is particularly preferred to form a preform from the optical glass of the present invention, and to use the preform for hot pressing, precision stamping, etc., to manufacture optical components such as lenses and prisms.

[0123] Both the glass preform and the optical element of the present invention are formed from the optical glass described above. The glass preform of the present invention possesses the excellent properties of optical glass; the optical element of the present invention possesses the excellent properties of optical glass, and can provide various optical elements such as lenses and prisms with high optical value.

[0124] Examples of lenses include concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, plano-concave lenses, and so on, where the lens surface is spherical or aspherical.

[0125] [Optical Instruments]

[0126] The optical elements formed by the optical glass of this invention can be used to manufacture optical instruments such as photographic equipment, video equipment, projection equipment, display equipment, vehicle-mounted equipment, and monitoring equipment.

[0127] Example

[0128] <Example of Optical Glass>

[0129] To further illustrate and explain the technical solution of the present invention, the following non-limiting embodiments are provided.

[0130] In this embodiment, optical glass with the composition shown in Tables 2 to 4 was obtained using the optical glass manufacturing method described above. Furthermore, the properties of each glass were measured using the testing method described in this invention, and the measurement results are shown in Tables 2 to 4.

[0131] Table 2.

[0132]

[0133]

[0134] Table 3.

[0135]

[0136]

[0137] Table 4.

[0138]

[0139]

[0140]

[0141] <Example of Glass Prefabricated Components>

[0142] The glass obtained from optical glass Examples 1 to 24# is used to manufacture preforms of various lenses and prisms, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses, by means of grinding, hot pressing, precision stamping, or other molding methods.

[0143] <Optical Component Examples>

[0144] Annealing these preforms obtained from the above glass preform examples reduces internal stress in the glass while fine-tuning the refractive index, so that optical properties such as the refractive index reach the desired values.

[0145] Next, the prefabricated parts are ground and polished to produce various lenses and prisms, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. Anti-reflective coatings can also be applied to the surface of the resulting optical elements.

[0146] <Examples of Optical Instruments>

[0147] The optical elements obtained from the above-described optical element embodiments can be used, through optical design, to form optical components or optical assemblies by using one or more optical elements. These components can be used in, for example, imaging devices, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / lighting in the automotive field, lithography technology, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices that include such circuits and chips.

Claims

1. Optical glass, characterized in that, Its composition, expressed as a weight percentage, contains: SiO2: 1–15%; B2O3: 2–10%; La2O3: 35–65%; Y2O3: 5–25%; ZrO2: 2–15%; Nb2O5: 5–15%; TiO2: 5–20%; WO3: 0–5%; RO: 0–10%, Y2O3 / TiO2 is 0.7–3.0, (WO3+TiO2) / Y2O3 is 0.3–1.5, Nb2O5 / Y2O3 is 0.2–0.867, (Nb2O5+WO3+Gd2O3) / TiO2 is 0.587–1.02, (RO+Gd2O3) / Y2O3 is less than 1.0, wherein RO is one or more of MgO, CaO, SrO, and BaO, and the refractive index n of the optical glass is... d It has a strength of 1.99 or higher, and a density ρ of 4.99 g / cm³. 3 The Young's modulus E is 13000 × 10⁻⁶. 7 Pa ~ 15500 × 10 7 Pa, wear degree F A It ranges from 90 to 105.

2. The optical glass according to claim 1, characterized in that, Its components are expressed as a weight percentage and also contain: Gd2O3: 0-10%; or Ta2O5: 0-5%; or Rn2O: 0-8%; or ZnO: 0-10%; or Al2O3: 0-8%; or Yb2O3: 0-10%; or GeO2: 0-5%; or clarifying agent: 0-2%, where Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifying agent is one or more of Sb2O3, SnO, SnO2, and CeO2.

3. Optical glass, characterized in that, Its composition is expressed as a weight percentage: SiO2: 1–15%; B2O3: 2–10%; La2O3: 35–65%; Y2O3: 5–25%; ZrO2: 2–15%; Nb2O5: 5–15%; TiO2: 5–20%; Gd2O3: 0–10%; Ta2O5: 0–5%; RO: 0–10%; Rn2O: 0–8%; WO3: 0–5%. ZnO: 0-10%; Al2O3: 0-8%; Yb2O3: 0-10%; GeO2: 0-5%; clarifying agent: 0-2% composition, Y2O3 / TiO2 is 0.7-3.0, (WO3+TiO2) / Y2O3 is 0.3-1.5, Nb2O5 / Y2O3 is 0.2-0.867, (Nb2O5+WO3+Gd2O3) / TiO2 is 0.587-1.02, (RO+Gd2O3) / Y2O3 is less than 1.0, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifying agent is one or more of Sb2O3, SnO, SnO2, and CeO2, and the refractive index n of the optical glass is... d It has a strength of 1.99 or higher, and a density ρ of 4.99 g / cm³. 3 The Young's modulus E is 13000 × 10⁻⁶. 7 Pa ~ 15500 × 10 7 Pa, wear degree F A It ranges from 90 to 105.

4. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, of which: La2O3+Y2O3+Gd2O3 is 45-75%.

5. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, of which: La2O3+Y2O3+Gd2O3 is 50-75%.

6. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, of which: La2O3+Y2O3+Gd2O3 is 55-70%.

7. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which: SiO2+B2O3 is 5-30%.

8. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which: SiO2+B2O3 is 8-25%.

9. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which: SiO2+B2O3 is 10-20%.

10. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which (La2O3+TiO2) / Nb2O5 is 3.0 to 30.

0.

11. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which (La2O3+TiO2) / Nb2O5 is 4.0 to 25.

0.

12. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which (La2O3+TiO2) / Nb2O5 is 5.0 to 20.

0.

13. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which (La2O3+TiO2) / Nb2O5 is 5.5 to 15.

0.

14. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which: Nb2O5 / Y2O3 is 0.3 to 0.

867.

15. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which: Nb2O5 / Y2O3 is 0.3 to 0.

867.

16. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which: Y2O3 / TiO2 is 0.7 to 2.

0.

17. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which: Y2O3 / TiO2 is 0.7 to 1.

5.

18. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which: Y2O3 / TiO2 is 0.7 to 1.

3.

19. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, wherein (RO+ZnO) / Y2O3 is less than 1.0, and RO is one or more of MgO, CaO, SrO, and BaO.

20. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, wherein (RO+ZnO) / Y2O3 is less than 0.8, and RO is one or more of MgO, CaO, SrO, and BaO.

21. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, wherein (RO+ZnO) / Y2O3 is less than 0.5, and RO is one or more of MgO, CaO, SrO, and BaO.

22. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, wherein (RO+ZnO) / Y2O3 is less than 0.2, and RO is one or more of MgO, CaO, SrO, and BaO.

23. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, wherein (RO+Gd2O3) / Y2O3 is less than 0.8, and the RO is one or more of MgO, CaO, SrO, and BaO.

24. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, wherein (RO+Gd2O3) / Y2O3 is less than 0.6, and the RO is one or more of MgO, CaO, SrO, and BaO.

25. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, wherein (RO+Gd2O3) / Y2O3 is less than 0.3, and RO is one or more of MgO, CaO, SrO, and BaO.

26. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, of which (WO3+TiO2) / Y2O3 is 0.4 to 1.

5.

27. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, of which (WO3+TiO2) / Y2O3 is 0.5 to 1.

5.

28. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, of which (WO3+TiO2) / Y2O3 is 0.7 to 1.

5.

29. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which (SiO2+B2O3) / Y2O3 is 0.2 to 3.

5.

30. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which (SiO2+B2O3) / Y2O3 is 0.4 to 3.

0.

31. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which (SiO2+B2O3) / Y2O3 is 0.5 to 2.

5.

32. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, of which (SiO2+B2O3) / Y2O3 is 0.7 to 1.

8.

33. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as weight percentages, wherein: SiO2: 2–10%; and / or B2O3: 4–10%; and / or La2O3: 40–60%; and / or Y2O3: 6–20%; and / or ZrO2: 3–12%; and / or Nb2O5: 5–12%; and / or Ta2O5: 0–3%; and / or Gd2O3: 0–6%; and / or TiO2: 6–18%; and / or RO: 0–5%; and / or Rn2O: 0–3% %; and / or WO3: 0-3%; and / or ZnO: 0-5%; and / or Al2O3: 0-4%; and / or Yb2O3: 0-5%; and / or GeO2: 0-3%; and / or clarifying agent: 0-1%, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifying agent is one or more of Sb2O3, SnO, SnO2, and CeO2.

34. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as weight percentages, wherein: SiO2: 4–9%; and / or B2O3: 5–10%; and / or La2O3: 42–55%; and / or Y2O3: 8–18%; and / or ZrO2: 4–10%; and / or Nb2O5: 5–10%; and / or Ta2O5: 0–1%; and / or Gd2O3: 0–4%; and / or TiO2: 8–15%; and / or RO: 0–2%; and / or Rn2O: 0–2%. And / or WO3: 0-2%; and / or ZnO: 0-2%; and / or Al2O3: 0-2%; and / or Yb2O3: 0-2%; and / or GeO2: 0-1%; and / or clarifying agent: 0-0.5%, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifying agent is one or more of Sb2O3, SnO, SnO2, and CeO2.

35. The optical glass according to any one of claims 1 to 3, characterized in that, Its components are expressed as a weight percentage, of which: Y2O3: 8-15%.

36. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, with the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 exceeding 90%.

37. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, with the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 exceeding 92%.

38. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, with the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 exceeding 94%.

39. The optical glass according to any one of claims 1 to 3, characterized in that, Its composition is expressed as a weight percentage, with the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 exceeding 96%.

40. The optical glass according to any one of claims 1 to 3, characterized in that, Its components do not contain Ta2O5; and / or WO3; and / or Yb2O3; and / or RO; and / or Rn2O; and / or ZnO; and / or Al2O3; and / or GeO2, wherein RO is one or more of MgO, CaO, SrO, and BaO, and Rn2O is one or more of Li2O, Na2O, and K2O.

41. The optical glass according to any one of claims 1 to 3, characterized in that, The refractive index n of the optical glass d The range is 1.99 to 2.02; Abbe number v d The range is 23 to 34.

42. The optical glass according to any one of claims 1 to 3, characterized in that, The Abbe number v of the optical glass d The range is 25 to 33.

43. The optical glass according to any one of claims 1 to 3, characterized in that, The Abbe number v of the optical glass d The range is 26 to 32.

44. The optical glass according to any one of claims 1 to 3, characterized in that, The Abbe number v of the optical glass d The range is 27 to 31.

45. The optical glass according to any one of claims 1 to 3, characterized in that, The coefficient of thermal expansion of the optical glass is α -30 / 70℃ 85×10 -7 / K or below; and / or water resistance stability D W Class 2 or above; and / or acid resistance stability D A Class 2 or above; and / or weather resistance CR class 2 or above; and / or Knoop hardness H K 670×10 7 Pa or above; and / or Young's modulus E is 13000 × 10⁻⁶. 7 Pa ~ 15000 × 10 7 Pa; and / or bubble degree of A or above.

46. ​​The optical glass according to any one of claims 1 to 3, characterized in that, The coefficient of thermal expansion of the optical glass is α -30 / 70℃ 80×10 -7 / K or below; and / or water resistance stability D W Class 1; and / or acid resistance stability D A Class 1; and / or weather resistance CR is Class 1; and / or Knoop hardness H K 680×10 7 Pa or above; and / or Young's modulus E is 13000 × 10⁻⁶. 7 Pa ~ 14500 × 10 7 Pa; and / or bubble degree of A0 or above.

47. The optical glass according to any one of claims 1 to 3, characterized in that, The coefficient of thermal expansion of the optical glass is α -30 / 70℃ 75×10 -7 / K or below; and / or Knoop hardness H K 690×10 7 Pa or above; and / or Young's modulus E is 13000 × 10⁻⁶. 7 Pa ~ 14000 × 10 7 Pa; and / or bubble degree of A 00 class.

48. A glass precast component, characterized in that, It is made of the optical glass described in any one of claims 1 to 47.

49. An optical element, characterized in that, It is made of the optical glass described in any one of claims 1 to 47, or of the glass preform described in claim 48.

50. An optical instrument, characterized in that, It contains the optical glass according to any one of claims 1 to 47, and / or contains the optical element according to claim 49.

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