Optical glass and optical element

Abstract

The present application provides an optical glass, which contains P2O5: 20-35%; Nb2O5: 37-55%; TiO2: 1-12%; BaO: 4-19%; Na2O: 0.5-14% by weight percentage, wherein Nb2O5 / P2O5 is 1.3-2.7. Through reasonable component design, the optical glass has excellent chemical stability and higher Young's modulus.

Description

Technical Field

[0001] This invention relates to an optical glass, and more particularly to an optical glass with excellent chemical stability and high Young's modulus, and optical elements made therefrom. Background Technology

[0002] With the continuous integration of optics with electronic information science and new materials science, the application of optical glass, as a fundamental material for optoelectronics, in fields such as optical transmission, optical storage, and optoelectronic displays has advanced rapidly. The rapid development of optical components and instruments in terms of digitization, integration, and high precision has placed higher demands on the performance of optical glass used in these instruments and equipment. 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 of optical instruments, the demand for high-refractive-index glass is becoming increasingly apparent. However, when processing optical glass into smaller or thinner optical components, if its Young's modulus is low, it is prone to deformation during use, reducing the lifespan of the optical instrument. On the other hand, optical glass is subject to corrosion from various liquids in the environment (such as acids, alkalis, and water) during processing or use. Therefore, the resistance of optical glass to these corrosions, i.e., the chemical stability of optical glass, is crucial to the accuracy and lifespan of the instrument. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an optical glass with excellent chemical stability and high Young's modulus.

[0004] The technical solution adopted by this invention to solve the technical problem is:

[0005] (1) Optical glass, the composition of which is expressed as a weight percentage, contains: P2O5: 20-35%; Nb2O5: 37-55%; TiO2: 1-12%; BaO: 4-19%; Na2O: 0.5-14%, of which Nb2O5 / P2O5 is 1.3-2.7.

[0006] (2) The optical glass according to (1) further comprises, by weight percentage: CaO: 0-8%; and / or MgO: 0-5%; and / or SrO: 0-8%; and / or ZnO: 0-5%; and / or Li2O: 0-5%; and / or K2O: 0-5%; and / or Ln2O3: 0-5%; and / or SiO2: 0-5%; and / or B2O3: 0-5%; and / or Al2O3: 0-3%; and / or WO3: 0-3%; and / or ZrO2: 0-5%; and / or Bi2O3: 0-3%; and / or clarifying agent: 0-1%, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0007] (3) Optical glass containing P2O5, Nb2O5, TiO2, BaO, and Na2O, the composition of which is expressed as a weight percentage, wherein the Nb2O5 / P2O5 ratio is 1.3 to 2.7, and the refractive index n of the optical glass is... d The Abbe number ν ranges from 1.82 to 1.89. d The stability of acid resistance is 18-26. A Class 2 or above, water resistance stability D W For classes 2 and above, Young's modulus E is 8000 × 10⁻⁶. 7 Pa or above.

[0008] (4) The optical glass according to (3) comprises, by weight percentage: P2O5: 20-35%; and / or Nb2O5: 37-55%; and / or TiO2: 1-12%; and / or BaO: 4-19%; and / or Na2O: 0.5-14%; and / or CaO: 0-8%; and / or MgO: 0-5%; and / or SrO: 0-8%; and / or ZnO: 0-5%; and / or Li2O: 0-5%; and / or K2O: 0-5%; And / or Ln2O3: 0-5%; and / or SiO2: 0-5%; and / or B2O3: 0-5%; and / or Al2O3: 0-3%; and / or WO3: 0-3%; and / or ZrO2: 0-5%; and / or Bi2O3: 0-3%; and / or clarifying agent: 0-1%, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0009] (5) The optical glass according to any one of (1) to (4), wherein the composition is expressed as a weight percentage, wherein: Nb2O5 / P2O5 is 1.4 to 2.5, preferably Nb2O5 / P2O5 is 1.5 to 2.2, more preferably Nb2O5 / P2O5 is 1.6 to 2.0; and / or SrO / TiO2 is 0.01 to 5.0, preferably SrO / TiO2 is 0.01 to 2.0, more preferably SrO / TiO2 is 0.05 to 1.0, and even more preferably SrO The ratio of SiO2 to TiO2 is 0.1–0.7; and / or the ratio of BaO to (Na2O+K2O+TiO2) is 0.4–5.0, preferably 0.5–3.0, more preferably 0.6–2.5, and even more preferably 0.7–1.5; and / or the ratio of SiO2+CaO+ZnO) to SrO is 0.3–8.0. Preferably, the ratio of (SiO2+CaO+ZnO) / SrO is 0.5–5.0, more preferably (SiO2+CaO+ZnO) / SrO is 0.6–3.0, and even more preferably (SiO2+CaO+ZnO) / SrO is 0.7–2.0; and / or the ratio of Na2O / BaO is 0.05–2.0, preferably Na2O / BaO is 0.1–1.5, more preferably Na2O / BaO is 0.2–1.0, and even more preferably Na2O / BaO is 0.4– 0.9; and / or BaO / P2O5 is 0.15 to 0.9, preferably BaO / P2O5 is 0.25 to 0.8, more preferably BaO / P2O5 is 0.3 to 0.7, and even more preferably BaO / P2O5 is 0.35 to 0.6; and / or TiO2 / CaO is 0.4 to 10.0, preferably TiO2 / CaO is 0.8 to 8.0, more preferably TiO2 / CaO is 1.0 to 6.0, and even more preferably TiO2 / CaO is 1.2 to 5.0.

[0010] (6) The optical glass according to any one of (1) to (4), wherein the composition is expressed as a weight percentage, wherein (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is 2.0 or less, preferably.

[0011] The ratio of (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is 1.5 or less, more preferably (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is 1.0 or less, even more preferably (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is 0.5 or less; and / or (Li2O+B2O3+Bi2O3) / TiO2 is 1.0 or less, preferably (Li2O+B2O3+B2O3+Bi2O3) / SrO is 0.5 or less; and / or (Li2O+B2O3+Bi2O3) / TiO2 is 1.0 or less, preferably (Li2O+B2O3+B2O3+Bi2O3) / TiO2 is 1.0 or less. The ratio of (Li₂O₃) / TiO₂ is 0.8 or less, more preferably (Li₂O+B₂O₃+Bi₂O₃) / TiO₂ is 0.5 or less, and even more preferably (Li₂O+B₂O₃+Bi₂O₃) / TiO₂ is 0.2 or less; and / or (WO₃+ZnO+K₂O+CaO+MgO) / TiO₂ is 2.0 or less, preferably (WO₃+ZnO+K₂O+CaO+MgO) / TiO₂ is 0.05 to 1.5, more preferably (WO₃+ZnO+K₂O+C₂O₃) / TiO₂ is 0.05 to 1.5, and more preferably (WO₃+ZnO+K₂O+C₂O₃) / TiO₂ is 0.05 to 1.5. The ratio of (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.1–1.0, more preferably 0.2–0.8; and / or the ratio of (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.03–0.4, preferably 0.04–0.3, and more preferably 0.05–0.25. Further preferred ratios are (WO3+K2O+TiO2+B2O3) / Nb2O5 of 0.06 to 0.15; and / or (Li2O+B2O3+TiO2) / BaO of 0.06 to 2.0, preferably (Li2O+B2O3+TiO2) / BaO of 0.07 to 1.5, more preferably (Li2O+B2O3+TiO2) / BaO of 0.08 to 1.0, and even more preferably (Li2O+B2O3+TiO2) / BaO of 0.1 to 0.5.

[0012] (7) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: P2O5: 22-32%, preferably P2O5: 25-30%; and / or Nb2O5: 41-52%, preferably Nb2O5: 43-50%; and / or TiO2: 2-10%, preferably TiO2: 3-7%; and / or BaO: 6-16.5%, preferably BaO: 10-15%; and / or N a₂O: 2–12%, preferably Na₂O: 5–10%; and / or CaO: greater than 0 but less than or equal to 6%, preferably CaO: 1–4%; and / or MgO: 0–3%, preferably MgO: 0–1%; and / or SrO: greater than 0 but less than or equal to 5%, preferably SrO: 0.5–3%; and / or ZnO: 0–3%, preferably ZnO: 0–1%; and / or Li₂O: 0–3%, preferably Li₂O: 0.5–3%. ~1%; and / or K2O: 0-3%, preferably K2O: 0-1%; and / or Ln2O3: 0-3%, preferably Ln2O3: 0-1%; and / or SiO2: 0-3%, preferably SiO2: 0-1%; and / or B2O3: 0-3%, preferably B2O3: 0-1%; and / or Al2O3: 0-2%, preferably Al2O3: 0-1%; and / or WO3: 0-2%, preferably WO3: 0-1% %; and / or ZrO2: 0-2%, preferably ZrO2: 0-1%; and / or Bi2O3: 0-2%, preferably Bi2O3: 0-1%; and / or clarifying agent: 0-0.5%, preferably clarifying agent: 0-0.1%, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0013] (8) The optical glass according to any one of (1) to (4) is free from MgO; and / or free from ZnO; and / or free from Li2O; and / or free from K2O; and / or free from Ln2O3; and / or free from B2O3; and / or free from Al2O3; and / or free from WO3; and / or free from ZrO2; and / or free from Bi2O3; and / or free from clarifying agent, wherein Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0014] (9) The optical glass according to any one of (1) to (4), wherein the refractive index n of the optical glass is d The Abbe number is 1.82–1.89, preferably 1.83–1.88, and more preferably 1.84–1.87; d The value is 18 to 26, preferably 20 to 25, and more preferably 21 to 24.

[0015] (10) The optical glass according to any one of (1) to (4), wherein the relative partial dispersion P of the optical glass g,F The relative partial dispersion deviation value ΔP is 0.58–0.72, preferably 0.60–0.68, and more preferably 0.62–0.65; g,F It is 0.08 or less, preferably 0.005 to 0.06, and more preferably 0.01 to 0.04.

[0016] (11) The optical glass according to any one of (1) to (4), wherein the coefficient of thermal expansion of the optical glass is α 100 / 300℃ 100×10 -7 / K or less, preferably 95×10 -7 / K or less, preferably 90×10 -7 / K below; and / or acid resistance stability D A It is classified as Class 2 or above, preferably Class 1; and / or water resistance stability D W It is classified into two or more categories, preferably one category; and / or the transition temperature T g The temperature is below 670°C, preferably below 660°C, and more preferably below 650°C; and / or the wear degree F A The density is 250–290, preferably 260–285, more preferably 265–280; and / or the density ρ is 4.00 g / cm³. 3 The preferred value is 3.90 g / cm³. 3 The preferred value is 3.80 g / cm³. 3 The following; and / or λ 70 For wavelengths below 430nm, λ is preferred. 70 For wavelengths below 420nm, λ is preferred. 70 The wavelength is 410 nm or less; and / or λ5 is 400 nm or less, preferably 390 nm or less, more preferably 380 nm or less; and / or the weather resistance CR is Class 2 or more, preferably Class 1; and / or the Young's modulus E is 8000 × 10⁻⁶. 7 Pa or higher, preferably 8500×10 Pa 7 Pa or higher, more preferably 9000 × 10 Pa 7 Pa or higher; and / or a bubble degree of A grade or higher, preferably A0 grade or higher, more preferably A. 00 class.

[0017] (12) Glass preform, made of any of the optical glass described in (1) to (11).

[0018] (13) Optical element, made of any of the optical glass described in (1) to (11), or made of the glass preform described in (12).

[0019] (14) An optical instrument containing any one of the optical glass described in (1) to (11), or containing the optical element described in (13).

[0020] The beneficial effects of this invention are: through reasonable component design, the optical glass of this invention has excellent chemical stability and high Young's modulus. Detailed Implementation

[0021] 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.

[0022] Optical Glass

[0023] 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%.

[0024] 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.

[0025] <Essential and Optional Components>

[0026] P2O5 is the network generator of the glass of this invention. Compared with silicate glass, phosphate glass can melt at low temperatures, which is beneficial to improving the light transmittance of the glass. If the content of P2O5 is too high, it is difficult for the glass to obtain a high refractive index. Therefore, the content of P2O5 in this invention is 20-35%, preferably 22-32%, and more preferably 25-30%.

[0027] Nb₂O₅ is a high-refractive-index, high-dispersion component that can improve the refractive index and devitrification resistance of glass, and also reduces the relative partial dispersion (P0) of glass. g,F ) and relative partial dispersion deviation (ΔP) g,FTo achieve the aforementioned effects, this invention uses Nb2O5 with a content of 37% or more. Preferably, the lower limit of the Nb2O5 content is 41%, and more preferably, it is 43%. If the Nb2O5 content exceeds 55%, the thermal and chemical stability of the glass decreases, and the light transmittance decreases. Therefore, the upper limit of the Nb2O5 content in this invention is 55%, preferably 52%, and more preferably 50%.

[0028] In some embodiments, controlling the Nb2O5 / P2O5 ratio within the range of 1.3 to 2.7 can improve the glass's resistance to crystallization and chemical stability, optimize its Young's modulus, and more easily obtain the desired P content. g,F Value and ΔP g,F Therefore, the preferred Nb2O5 / P2O5 ratio is 1.3 to 2.7, more preferably 1.4 to 2.5, even more preferably 1.5 to 2.2, and still more preferably 1.6 to 2.0.

[0029] TiO2 possesses high refractive index and high dispersion properties, which can improve the chemical stability of glass and adjust the relative partial dispersion (P0) of the glass. g,F ) and relative partial dispersion deviation (ΔP) g,F If the TiO2 content is too high, the glass's resistance to devitrification and light transmittance will decrease. Therefore, the TiO2 content is 1-12%, preferably 2-10%, and more preferably 3-7%.

[0030] BaO can improve the devitrification resistance and hardness of glass, and reduce the temperature coefficient of refractive index and the coefficient of thermal expansion of glass. In this invention, the above effects are achieved by containing 4% or more BaO, preferably 6% or more, and more preferably 10% or more. On the other hand, by keeping the BaO content at 19% or less, the decrease in chemical stability caused by excessive BaO content can be prevented. Therefore, the BaO content is 19% or less, preferably 16.5% or less, and more preferably 15% or less.

[0031] In some embodiments, controlling the ratio of BaO content to P2O5 content (BaO / P2O5) within the range of 0.15 to 0.9 can improve the weather resistance and light transmittance of the glass and optimize its abrasion resistance. Therefore, a BaO / P2O5 ratio of 0.15 to 0.9 is preferred, 0.25 to 0.8 is more preferred, 0.3 to 0.7 is even more preferred, and 0.35 to 0.6 is still more preferred.

[0032] CaO helps adjust the optical constants of glass, improve its processing properties and weather resistance, but excessive CaO content can worsen the glass's resistance to crystallization. Therefore, the CaO content is 0–8%, preferably greater than 0 but less than or equal to 6%, and more preferably 1–4%.

[0033] In some embodiments, controlling the TiO2 / CaO ratio (TiO2 / CaO) within the range of 0.4 to 10.0 is beneficial for reducing the coefficient of thermal expansion of the glass and optimizing its Young's modulus and abrasion resistance. Therefore, a TiO2 / CaO ratio of 0.4 to 10.0 is preferred, more preferably 0.8 to 8.0, even more preferably 1.0 to 6.0, and still more preferably 1.2 to 5.0.

[0034] SrO can adjust the refractive index and dispersion of glass, but if the content is too high, the chemical stability of the glass will decrease, and the cost of the glass will also increase. Therefore, the SrO content is 0-8%, preferably greater than 0 but less than or equal to 5%, and more preferably 0.5-3%.

[0035] In some embodiments, controlling the SrO / TiO2 ratio (SrO / TiO2) within the range of 0.01 to 5.0 is beneficial for the glass to achieve the desired P content. g,F Value and ΔP g,F While increasing the value, the Young's modulus of the glass is also improved to prevent a decrease in light transmittance. Therefore, the preferred SrO / TiO2 ratio is 0.01 to 5.0, more preferably 0.01 to 2.0, even more preferably 0.05 to 1.0, and even more preferably 0.1 to 0.7.

[0036] MgO is beneficial for reducing the density and melting temperature of glass; however, excessive MgO content makes it difficult for the glass to achieve the designed refractive index, and reduces its resistance to crystallization and stability. Therefore, the MgO content is 0–5%, preferably 0–3%, and more preferably 0–1%. In some embodiments, it is even more preferable that the glass does not contain MgO.

[0037] ZnO can lower the glass transition temperature and fusing temperature, improve the chemical stability of glass, and reduce its high-temperature viscosity. However, if the ZnO content is too high, the glass's resistance to crystallization deteriorates, and it is prone to devitrification due to excessively low viscosity. Therefore, the ZnO content in this invention is 0–5%, preferably 0–3%, and more preferably 0–1%. In some embodiments, it is further preferred that the glass does not contain ZnO.

[0038] Li₂O can improve the melting properties of glass and lower its transition temperature. However, if its content is too high, the refractive index of the glass will be difficult to meet the design requirements, and the chemical stability of the glass will deteriorate. Therefore, the content of Li₂O in this invention is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that the glass does not contain Li₂O.

[0039] Na₂O can improve the melt flowability and formability of glass, and optimize its light transmittance. However, if its content is too high, it is detrimental to the thermal expansion coefficient and chemical stability of the glass. Therefore, the Na₂O content is 0.5–14%, preferably 2–12%, and more preferably 5–10%.

[0040] In some embodiments, controlling the Na2O / BaO ratio (Na2O / BaO) within the range of 0.05 to 2.0 is beneficial for improving the bubble content of the glass, optimizing its abrasion resistance, and preventing an increase in the coefficient of thermal expansion. Therefore, a Na2O / BaO ratio of 0.05 to 2.0 is preferred, more preferably 0.1 to 1.5, even more preferably 0.2 to 1.0, and still more preferably 0.4 to 0.9.

[0041] K2O improves the thermal stability and melt properties of glass, but excessive K2O content reduces the glass's resistance to devitrification. Therefore, the K2O content is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is even more preferable that the glass does not contain K2O.

[0042] In some embodiments, the ratio of BaO content to the total content of Na2O, K2O, and TiO2 (Na2O+K2O+TiO2), BaO / (Na2O+K2O+TiO2), is controlled within the range of 0.4 to 5.0, making it easier for the glass to obtain the desired P content. g,F Value and ΔP g,F To prevent the glass density from increasing, the BaO / (Na₂O+K₂O+TiO₂) ratio is preferably 0.4–5.0, more preferably 0.5–3.0. Furthermore, controlling the BaO / (Na₂O+K₂O+TiO₂) ratio within the range of 0.6–2.5 can further optimize the glass's abrasion resistance and bubble content. Therefore, a BaO / (Na₂O+K₂O+TiO₂) ratio of 0.6–2.5 is further preferred, and even more preferably 0.7–1.5.

[0043] Ln2O3 (Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3) is a component that improves the refractive index of glass and is an optional component in the optical glass of the present invention. By controlling the content of Ln2O3 to below 5%, the devitrification resistance of the glass can be prevented from decreasing. Therefore, in the present invention, the content of Ln2O3 is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that Ln2O3 is not present.

[0044] The presence of SiO2 in phosphate glass can make the glass mesh more compact, improving its chemical stability and mechanical strength. However, phosphate glass meshes are not very compatible with SiO2, and phase separation precipitation can easily occur when the SiO2 content is too high. Therefore, in this invention, the SiO2 content is 0-5%, preferably 0-3%, and more preferably 0-1%.

[0045] In some embodiments, controlling the ratio of the total content of SiO2, CaO, and ZnO (SiO2+CaO+ZnO) to the content of SrO (SiO2+CaO+ZnO) / SrO within the range of 0.3 to 8.0 is beneficial for reducing the coefficient of thermal expansion and density of the glass and optimizing its weather resistance. Therefore, it is preferable that (SiO2+CaO+ZnO) / SrO is 0.3 to 8.0, more preferably (SiO2+CaO+ZnO) / SrO is 0.5 to 5.0, further preferably (SiO2+CaO+ZnO) / SrO is 0.6 to 3.0, and even more preferably (SiO2+CaO+ZnO) / SrO is 0.7 to 2.0.

[0046] B2O3 improves the thermal stability and melt permeability of glass, but its high content reduces the chemical stability and devitrification resistance of the glass. Therefore, the content of B2O3 in this invention is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that the glass does not contain B2O3.

[0047] In some embodiments, controlling the ratio of the total content of Li2O, B2O3, and TiO2 (Li2O+B2O3+TiO2) to the content of BaO (Li2O+B2O3+TiO2) / BaO within the range of 0.06 to 2.0 can improve the weather resistance of the glass, prevent the transition temperature from rising, and make it easier to obtain the desired P. g,F Value and ΔP g,FTherefore, the preferred value of (Li2O+B2O3+TiO2) / BaO is 0.06 to 2.0, more preferably (Li2O+B2O3+TiO2) / BaO is 0.07 to 1.5, further preferably (Li2O+B2O3+TiO2) / BaO is 0.08 to 1.0, and even more preferably (Li2O+B2O3+TiO2) / BaO is 0.1 to 0.5.

[0048] Al2O3 can improve the chemical stability of glass, but when its content exceeds 3%, the meltability and light transmittance of the glass deteriorate. Therefore, the content of Al2O3 in this invention is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is further preferred that Al2O3 is not present.

[0049] WO3 is an optional component that can adjust the optical constants and devitrification resistance of glass, but when its content is high, the transmittance and anti-crystallization properties of the glass decrease. Therefore, the WO3 content is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is even more preferable that the glass does not contain WO3.

[0050] In some embodiments, the ratio of the total content of WO3, ZnO, K2O, CaO, and MgO (WO3+ZnO+K2O+CaO+MgO) to the content of TiO2 (WO3+ZnO+K2O+CaO+MgO) / TiO2 is controlled to be below 2.0. This can reduce the glass transition temperature while increasing the bubble content of the glass and optimizing its abrasion resistance. Therefore, it is preferable that (WO3+ZnO+K2O+CaO+MgO) / TiO2 is below 2.0, more preferably (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.05 to 1.5, further preferably (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.1 to 1.0, and even more preferably (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.2 to 0.8.

[0051] In some embodiments, controlling the ratio of the total content of WO3, K2O, TiO2, and B2O3 (WO3+K2O+TiO2+B2O3) to the content of Nb2O5 (WO3+K2O+TiO2+B2O3) / Nb2O5 within the range of 0.03 to 0.4 can reduce the coefficient of thermal expansion of the glass and improve its light transmittance and chemical stability. Therefore, it is preferable that (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.03 to 0.4, more preferably (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.04 to 0.3, further preferably (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.05 to 0.25, and even more preferably (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.06 to 0.15.

[0052] An appropriate amount of ZrO2 can increase the mechanical strength and hardness of glass, improve its resistance to crystallization, and adjust the P of the glass. g,F Value and ΔP g,F However, ZrO2 is difficult to dissolve in phosphate glass, and excessive ZrO2 content can lead to difficulties in material processing. Therefore, the ZrO2 content in this invention is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is further preferred that ZrO2 is not present.

[0053] Bi₂O₃ can increase the refractive index of glass, but its high density is detrimental to lightweight glass design. Therefore, the content of Bi₂O₃ in this invention is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is further preferred that Bi₂O₃ is not present.

[0054] In some embodiments, controlling the ratio between the total content of ZnO, Li2O, K2O, WO3, B2O3 and Bi2O3 (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) and the content of SrO (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO below 2.0 can improve the bubble content of the glass while having a low coefficient of thermal expansion, optimize Young's modulus, and prevent a decrease in light transmittance. Therefore, it is preferable that (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is 2.0 or less, more preferably (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is 1.5 or less, even more preferably (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is 1.0 or less, and even more preferably (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is 0.5 or less.

[0055] In some embodiments, the ratio of the total content of Li2O, B2O3, and Bi2O3 (Li2O+B2O3+Bi2O3) to the content of TiO2 (Li2O+B2O3+Bi2O3) / TiO2 is controlled below 1.0. This allows the glass to have a lower transition temperature while also reducing its density, optimizing its chemical stability, and making it easier to achieve the desired Pg. g,F Value and ΔP g,F Therefore, it is preferable that (Li2O+B2O3+Bi2O3) / TiO2 is 1.0 or less, more preferably (Li2O+B2O3+Bi2O3) / TiO2 is 0.8 or less, even more preferably (Li2O+B2O3+Bi2O3) / TiO2 is 0.5 or less, and even more preferably (Li2O+B2O3+Bi2O3) / TiO2 is 0.2 or less.

[0056] In this invention, one or more components selected from Sb₂O₃, SnO₂, and CeO₂ are used as clarifying agents, which can improve the clarification effect and bubble content of the glass. Preferably, the content of the clarifying agent is 0-0.5%, more preferably 0-0.1%. 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 1%, 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 0-1%, more preferably 0-0.5%, further preferably 0-0.1%, and even more preferably free of Sb₂O₃. SnO₂ can also be used as a clarifying agent, but when its content exceeds 1%, 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 0-1%, more preferably 0-0.5%, further preferably 0-0.1%, and even more preferably does not contain SnO2. The role and content ratio of CeO2 are the same as those of SnO2, and its content is preferably 0-1%, more preferably 0-0.5%, further preferably 0-0.1%, and even more preferably does not contain CeO2.

[0057] <Components that should not be present>

[0058] 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.

[0059] 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.

[0060] To achieve environmental friendliness, the optical glass of the present invention preferably does not contain As2O3 and PbO.

[0061] 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.

[0062] The performance of the optical glass of the present invention will now be described.

[0063] <Refractive Index and Abbe Number>

[0064] 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.

[0065] In some embodiments, the refractive index (n) of the optical glass of the present invention d The lower limit is 1.82, the preferred lower limit is 1.83, and the more preferred lower limit is 1.84.

[0066] In some embodiments, the refractive index (n) of the optical glass of the present invention d The upper limit of ) is 1.89, the preferred upper limit is 1.88, and the more preferred upper limit is 1.87.

[0067] In some embodiments, the Abbe number (ν) of the optical glass of the present invention dThe lower limit is 18, the preferred lower limit is 20, and the more preferred lower limit is 21.

[0068] In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The upper limit of ) is 26, the preferred upper limit is 25, and the more preferred upper limit is 24.

[0069] Coefficient of thermal expansion

[0070] The coefficient of thermal expansion of optical glass (α) 100 / 300℃ Data were tested at 100–300°C according to the method specified in GB / T7962.16—2010.

[0071] In some embodiments, the coefficient of thermal expansion (α) of the optical glass of the present invention is... 100 / 300℃ ) is 100×10 -7 / K or less, preferably 95×10 -7 / K or less, preferably 90×10 -7 / K or below.

[0072] <Stability under acid conditions>

[0073] Acid resistance stability of optical glass (D) A (Powder method) Tested according to the method specified in GB / T 17129.

[0074] 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.

[0075] <Stability under water resistance>

[0076] Water resistance stability of optical glass (D) W (Powder method) Tested according to the method specified in GB / T 17129.

[0077] 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.

[0078] <Relative partial dispersion and relative partial dispersion deviation>

[0079] The following formula illustrates the relative partial dispersion (P) g,F ) and relative partial dispersion deviation (ΔP) g,F ) origin.

[0080] The relative partial dispersion of wavelengths x and y is expressed by the following equation (1):

[0081] P x,y =(n x-n y ) / (n F -n C (1)

[0082] According to the Abbe number formula, for most so-called "normal glass" (hereinafter, H-K6 and F4 are selected as "normal glass"), the following equation (2) holds true.

[0083] P x,y =m x,y ·v d +b x,y (2)

[0084] This linear relationship is based on P. x,y For the ordinate, v d The x-axis is used to represent the coordinates, where m is the x-axis. x,y Let b be the slope. x,y This is the intercept.

[0085] As is well known, the correction of a second-order spectrum, that is, the achromatic correction of more than two wavelengths, requires at least one type of glass that does not conform to the above formula (2) (i.e., its P). x,y The value deviates from Abbe's empirical formula, and the deviation is expressed as ΔP. x,y This means that each P x,y -v d The point is translated by ΔP relative to the "normal line" that conforms to equation (2) above. x,y Quantity, thus the ΔP of each glass x,y The numerical value can be obtained using the following formula (3):

[0086] P x,y =m x,y ·v d +b x,y +ΔP x,y (3)

[0087] Therefore, ΔP x,y It quantitatively represents the deviation of the special dispersion characteristics compared to "normal glass".

[0088] Therefore, from the above, we can obtain the relative partial dispersion (P). g,F ) and relative partial dispersion deviation (ΔP) g,F The calculation formulas for ) are as follows: (4) and (5):

[0089] P g,F =(n g -n F ) / (n F -n C (4)

[0090] ΔP g,F =P g,F-0.6457 +0.001703v d (5)

[0091] In some embodiments, the relative partial dispersion (P) of the optical glass of the present invention g,F The value is 0.58 to 0.72, preferably 0.60 to 0.68, and more preferably 0.62 to 0.65.

[0092] In some embodiments, the relative partial dispersion deviation (ΔP) of the optical glass of the present invention g,F The value is 0.08 or less, preferably 0.005 to 0.06, and more preferably 0.01 to 0.04.

[0093] <Transition Temperature>

[0094] Transition temperature of optical glass (T) g The test shall be conducted in accordance with the method specified in GB / T7962.16—2010.

[0095] In some embodiments, the transition temperature (T) of the optical glass of the present invention is... g The temperature is below 670°C, preferably below 660°C, and more preferably below 650°C.

[0096] <wear level>

[0097] 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:

[0098] F A =V / V0×100=(W / ρ) / (W0 / ρ0)×100

[0099] Where: V—volume wear of the tested sample;

[0100] V0—Standard sample volume wear amount;

[0101] W—Mass wear of the tested sample;

[0102] W0—Standard sample mass wear amount;

[0103] ρ—Density of the sample being measured;

[0104] ρ0 — density of the standard sample.

[0105] In some embodiments, the abrasion degree (F) of the optical glass of the present invention A The lower limit of ) is 250, the preferred lower limit is 260, and the more preferred lower limit is 265.

[0106] In some embodiments, the abrasion degree (F) of the optical glass of the present invention A The upper limit of ) is 290, the preferred upper limit is 285, and the more preferred upper limit is 280.

[0107] <Density>

[0108] Density (ρ) was tested according to the method specified in GB / T7962.20—2010.

[0109] In some embodiments, the density (ρ) of the optical glass of the present invention is 4.00 g / cm³. 3 The preferred value is 3.90 g / cm³. 3 The preferred value is 3.80 g / cm³. 3 the following.

[0110] <shading>

[0111] The short-wavelength transmission spectral characteristics of the glass of this invention are expressed using colorimetry (λ). 70 And λ5) represent. λ 70 This refers to the wavelength corresponding to a glass transmittance of 70%. λ 70 The measurement was performed using a glass with a thickness of 10 ± 0.1 mm and two optically polished, parallel planes. The spectral transmittance was measured in the wavelength range from 280 nm to 700 nm, and wavelengths exhibiting 70% transmittance were recorded. Spectroscopic transmittance, or transmittance, is the value of transmittance when an intensity I is incident perpendicularly onto the aforementioned surface of the glass. in Light passes through the glass and exits from a plane with an intensity of I. out In the case of light, through I out / I in The value represents the transmittance, which also includes the surface reflection loss on the aforementioned surfaces of the glass. The higher the refractive index of the glass, the greater the surface reflection loss. Therefore, in high-refractive-index glasses, λ... 70 A low value means that the glass itself has very little coloration and high light transmittance.

[0112] In some embodiments, the λ of the optical glass of the present invention 70 For wavelengths below 430nm, λ is preferred. 70 For wavelengths below 420nm, λ is preferred. 70 It is below 410nm.

[0113] In some embodiments, the λ5 of the optical glass of the present invention is 400 nm or less, preferably 390 nm or less, and more preferably 380 nm or less.

[0114] <Weather resistance>

[0115] 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.

[0116] Table 1.

[0117]

[0118]

[0119] In some embodiments, the weather resistance (CR) of the optical glass of the present invention is Class 2 or above, preferably Class 1.

[0120] Young's Modulus

[0121] Young's modulus (E) is obtained by ultrasonic testing of its longitudinal and transverse wave velocities, and then calculated using the following formula.

[0122]

[0123] G = V S 2 ρ

[0124] In the formula: E is Young's modulus, Pa;

[0125] G is the shear modulus, Pa;

[0126] V T The transverse wave velocity is in m / s;

[0127] V S The longitudinal wave velocity is given in m / s.

[0128] ρ is the density of glass, in g / cm³ 3 .

[0129] In some embodiments, the Young's modulus (E) of the optical glass of the present invention is 8000 × 10⁻⁶. 7 Pa or higher, preferably 8500×10 Pa 7 Pa or higher, more preferably 9000 × 10 Pa 7 Pa or above.

[0130] <Effervescence>

[0131] The bubble content of optical glass shall be tested according to the method specified in GB / T7962.8—2010.

[0132] 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.

[0133] [Manufacturing methods for optical glass]

[0134] 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, phosphates, metaphosphates, 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 1050-1250°C, preferably 1100-1200°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.

[0135] [Glass preforms and optical components]

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] [Optical Instruments]

[0141] 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.

[0142] Example

[0143] <Example of Optical Glass>

[0144] To further illustrate and explain the technical solution of the present invention, the following non-limiting embodiments are provided.

[0145] 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.

[0146] Table 2.

[0147]

[0148]

[0149] Table 3.

[0150]

[0151]

[0152]

[0153] Table 4.

[0154]

[0155]

[0156]

[0157] <Example of Glass Prefabricated Components>

[0158] The glass obtained from optical glass Examples 1 to 21# is used, for example, by grinding, or by molding such as hot pressing or precision stamping, to produce 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.

[0159] <Optical Component Examples>

[0160] Annealing the preforms obtained from the above glass preform examples reduces the internal stress of the glass while fine-tuning the refractive index, so that the optical properties such as the refractive index reach the desired values.

[0161] 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.

[0162] <Examples of Optical Instruments>

[0163] 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: P2O5: 20–35%; Nb2O5: 37–55%; TiO2: 2–12%; BaO: 4–19%; Na2O: 0.5–14%; SrO: greater than 0 but less than or equal to 8%, wherein Nb2O5 / P2O5 is 1.4–2.0, BaO / (Na2O+K2O+TiO2) is 0.4–1.5, SrO / TiO2 is 0.1–0.7, (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.2–1.70, Na2O / BaO is 0.56–2.0, (SiO2+CaO+ZnO) / SrO is 0.3–2.0, and Young's modulus E is 8915 × 10⁻⁶. 7 Above Pa, the coefficient of thermal expansion α 100 / 300℃ 90×10 -7 Below / K, the density ρ is 3.80 g / cm³. 3 the following.

2. The optical glass according to claim 1, characterized in that, Its components, expressed as a weight percentage, also contain: CaO: 0–8%; and / or MgO: 0–5%; and / or ZnO: 0–5%; and / or Li2O: 0–5%; and / or K2O: 0–5%; and / or Ln2O3: 0–5%; and / or SiO2: 0–5%; and / or B2O3: 0–5%; and / or Al2O3: 0–3%; and / or WO3: 0–3%; and / or ZrO2: 0–5%; and / or Bi2O3: 0–3%; and / or clarifying agent: 0–1%, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

3. Optical glass, characterized in that, Its composition, expressed as a weight percentage, contains: P2O5: 20–35%; Nb2O5: 37–55%; TiO2: 2–12%; BaO: 4–19%; Na2O: 0.5–14%, wherein Nb2O5 / P2O5 is 1.4–2.0, BaO / (Na2O+K2O+TiO2) is 0.4–1.5, SrO / TiO2 is 0.1–0.7, (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.2–1.70, Na2O / BaO is 0.56–2.0, and (SiO2+CaO+ZnO) / SrO is 0.3–2.

0. The refractive index n of the optical glass is... d The Abbe number ν ranges from 1.82 to 1.

89. d The stability of the acid is 18-26. A Class 2 or above, water resistance stability D W For classes 2 and above, Young's modulus E is 8915 × 10⁻⁶. 7 Above Pa, the coefficient of thermal expansion α 100 / 300℃ 90×10 -7 Below / K, the density ρ is 3.80 g / cm³. 3 the following.

4. The optical glass according to claim 3, characterized in that, Its components, expressed as a weight percentage, also contain: CaO: 0–8%; and / or MgO: 0–5%; and / or SrO: greater than 0 but less than or equal to 8%; and / or ZnO: 0–5%; and / or Li2O: 0–5%; and / or K2O: 0–5%; and / or Ln2O3: 0–5%; and / or SiO2: 0–5%; and / or B2O3: 0–5%; and / or Al2O3: 0–3%; and / or WO3: 0–3%; and / or ZrO2: 0–5%; and / or Bi2O3: 0–3%; and / or clarifying agent: 0–1%, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

5. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: Nb2O5 / P2O5 is 1.5 to 2.0; and / or BaO / (Na2O+K2O+TiO2) is 0.5 to 1.5; and / or (SiO2+CaO+ZnO) / SrO is 0.5 to 2.0; and / or Na2O / BaO is 0.56 to 1.5; and / or BaO / P2O5 is 0.15 to 0.9; and / or TiO2 / CaO is 0.4 to 10.

0.

6. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: Nb2O5 / P2O5 is 1.6 to 2.0; and / or BaO / (Na2O+K2O+TiO2) is 0.6 to 1.5; and / or (SiO2+CaO+ZnO) / SrO is 0.6 to 2.0; and / or Na2O / BaO is 0.56 to 1.0; and / or BaO / P2O5 is 0.25 to 0.8; and / or TiO2 / CaO is 0.8 to 8.

0.

7. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: BaO / (Na2O+K2O+TiO2) is 0.7-1.5; and / or (SiO2+CaO+ZnO) / SrO is 0.7-2.0; and / or Na2O / BaO is 0.56-0.9; and / or BaO / P2O5 is 0.3-0.7; and / or TiO2 / CaO is 1.0-6.

0.

8. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, wherein: BaO / P2O5 is 0.35 to 0.6; and / or TiO2 / CaO is 1.2 to 5.

0.

9. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is less than 2.0; and / or (Li2O+B2O3+Bi2O3) / TiO2 is less than 1.0; and / or (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.2 to 1.5; and / or (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.03 to 0.4; and / or (Li2O+B2O3+TiO2) / BaO is 0.06 to 2.

0.

10. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is less than 1.5; and / or (Li2O+B2O3+Bi2O3) / TiO2 is less than 0.8; and / or (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.2 to 1.0; and / or (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.04 to 0.3; and / or (Li2O+B2O3+TiO2) / BaO is 0.07 to 1.

5.

11. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is less than 1.0; and / or (Li2O+B2O3+Bi2O3) / TiO2 is less than 0.5; and / or (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.2 to 0.8; and / or (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.05 to 0.25; and / or (Li2O+B2O3+TiO2) / BaO is 0.08 to 1.

0.

12. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is less than 0.5; and / or (Li2O+B2O3+Bi2O3) / TiO2 is less than 0.2; and / or (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.06 to 0.15; and / or (Li2O+B2O3+TiO2) / BaO is 0.1 to 0.

5.

13. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: P2O5: 22–32%; and / or Nb2O5: 41–52%; and / or TiO2: 2–10%; and / or BaO: 6–16.5%; and / or Na2O: 2–12%; and / or CaO: greater than 0 but less than or equal to 6%; and / or MgO: 0–3%; and / or SrO: greater than 0 but less than or equal to 5%; and / or ZnO: 0–3%; and / or Li2O: 0–3%; and / or K2O: 0–3%; and / or Or Ln2O3: 0-3%; and / or SiO2: 0-3%; and / or B2O3: 0-3%; and / or Al2O3: 0-2%; and / or WO3: 0-2%; and / or ZrO2: 0-2%; and / or Bi2O3: 0-2%; and / or clarifying agent: 0-0.5%, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

14. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, including: P2O5: 25–30%; and / or Nb2O5: 43–50%; and / or TiO2: 3–7%; and / or BaO: 10–15%; and / or Na2O: 5–10%; and / or CaO: 1–4%; and / or MgO: 0–1%; and / or SrO: 0.5–3%; and / or ZnO: 0–1%; and / or Li2O: 0–1%; and / or K2O: 0–1%; and / or Ln2O3: 0-1%; and / or SiO2: 0-1%; and / or B2O3: 0-1%; and / or Al2O3: 0-1%; and / or WO3: 0-1%; and / or ZrO2: 0-1%; and / or Bi2O3: 0-1%; and / or clarifying agent: 0-0.1%, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

15. The optical glass according to any one of claims 1 to 4, characterized in that, Its components do not contain MgO; and / or do not contain ZnO; and / or do not contain Li2O; and / or do not contain K2O; and / or do not contain Ln2O3; and / or do not contain B2O3; and / or do not contain Al2O3; and / or do not contain WO3; and / or do not contain ZrO2; and / or do not contain Bi2O3; and / or do not contain a clarifying agent, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

16. The optical glass according to any one of claims 1 to 2, characterized in that, The refractive index n of the optical glass d The range is 1.82–1.89; the Abbe number ν d The range is 18 to 26.

17. The optical glass according to any one of claims 1 to 4, characterized in that, The refractive index n of the optical glass d The Abbe number is 1.83–1.

88. d It is 20 to 25.

18. The optical glass according to any one of claims 1 to 4, characterized in that, The refractive index n of the optical glass d The Abbe number is 1.84–1.

87. d It ranges from 21 to 24.

19. The optical glass according to any one of claims 1 to 4, characterized in that, The relative partial dispersion P of the optical glass g,F The relative partial dispersion deviation value ΔP is 0.58–0.

72. g,F It is below 0.

08.

20. The optical glass according to any one of claims 1 to 4, characterized in that, The relative partial dispersion P of the optical glass g,F The relative partial dispersion deviation value ΔP is 0.60–0.

68. g,F It ranges from 0.005 to 0.

06.

21. The optical glass according to any one of claims 1 to 4, characterized in that, The relative partial dispersion P of the optical glass g,F The relative partial dispersion deviation value ΔP is 0.62–0.

65. g,F The value ranges from 0.01 to 0.

04.

22. The optical glass according to any one of claims 1 to 2, characterized in that, The acid resistance stability D of the optical glass A Class 2 or above; and / or water resistance stability D W It is classified as category 2 or above.

23. The optical glass according to any one of claims 1 to 4, characterized in that, The acid resistance stability D of the optical glass A Class 1; and / or water resistance stability D W Class 1; and / or transition temperature T g Temperature below 670℃; and / or wear degree F A 250–290; and / or λ 70 The wavelength is below 430 nm; and / or λ5 is below 400 nm; and / or the weather resistance CR is Class 2 or above; and / or the Young's modulus E is 9000×10⁻⁶. 7 Pa or higher; and / or bubble degree of A or higher.

24. The optical glass according to any one of claims 1 to 4, characterized in that, The transition temperature T of the optical glass g Temperature below 660℃; and / or wear degree F A 260–285; and / or λ 70 The wavelength is below 420nm; and / or λ5 is below 390nm; and / or the weather resistance CR is Class 1; and / or the bubble degree is A0 or above.

25. The optical glass according to any one of claims 1 to 4, characterized in that, The transition temperature T of the optical glass g Temperature below 650℃; and / or wear degree F A 265–280; and / or λ 70 The wavelength is below 410 nm; and / or λ5 is below 380 nm; and / or the bubble degree is A. 00 class.

26. A glass precast component, characterized in that, It is made of the optical glass described in any one of claims 1 to 25.

27. An optical element, characterized in that, It is made of optical glass as described in any one of claims 1 to 25, or of glass preform as described in claim 26.

28. An optical instrument, characterized in that, It contains the optical glass according to any one of claims 1 to 25, or the optical element according to claim 27.

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