Optical glass, glass preform, optical element and optical instrument

Abstract

The invention provides optical glass which comprises the following components in percentage by weight: 20-32% of SiO2; 21 to 34 percent of TiO2; 8 to 20 percent of Nb2O5; baO: greater than 10% but less than or equal to 22%; 8.5% to 20% of Na2O; and 0.1 to 9 percent of Bi2O3. Through reasonable component design, the optical glass with the refractive index of 1.81-1.88 and the Abbe number of 20-27 is obtained by adopting a silicate glass system, the raw material cost and the production cost of the optical glass are relatively low, and the requirement of environmental protection is met.

Description

Technical Field

[0001] This invention relates to an optical glass, and more particularly to an optical glass with a refractive index of 1.81 to 1.88 and an Abbe number of 20 to 27. Background Technology

[0002] Optical glass with a refractive index of 1.81–1.88 and an Abbe number of 20–27 belongs to high-refractive-index flint glass. This type of glass has a high refractive index and dispersion. When used in conjunction with crown glass, it can effectively eliminate chromatic aberration and secondary spectrum. At the same time, it can effectively shorten the overall optical length of the lens and make the imaging system miniaturized. Therefore, this type of glass has broad application prospects in optical design.

[0003] In existing technologies, the P2O5-Nb2O5-TiO2-RO glass system (i.e., the phosphate system) is commonly used to manufacture high-refractive-index, high-dispersion glasses. For example, CN102206043A discloses an optical glass with a refractive index of 1.70–2.00 and an Abbe number of 15–29.5; CN101941796A discloses an optical glass with a refractive index of 1.80–1.92 and an Abbe number of 18–23; and CN103663961A discloses an optical glass with a refractive index of 1.75–2.20 and an Abbe number of 10–35. The raw material cost of phosphate system optical glasses is higher than that of silicate and borate system glasses, and their production is more difficult and costly. Phosphate glasses cause greater corrosion (consumption) of platinumware used in the production process than silicate and borate system glasses. Furthermore, platinumware produced using phosphate glass requires special purification during recycling, further increasing production costs. On the other hand, phosphate glass exhibits significant volatilization during production, resulting in substantial environmental impact and affecting the consistency of glass performance. Existing technologies also employ the SiO2-PbO system to manufacture high-refractive-index, high-dispersion optical glasses. For example, CN1186279C discloses an optical glass with a refractive index of 1.75–1.85 and an Abbe number of 21–28, and CN1229293C discloses an optical glass with a refractive index of 1.75–1.90. However, SiO2-PbO optical glasses contain a large amount of PbO, making it difficult to meet environmental protection requirements. 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 1.81 to 1.88 and an Abbe number of 20 to 27 that meets the requirements of environmental protection.

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

[0006] Optical glass, whose composition by weight percentage contains: SiO2: 20-32%; TiO2: 21-34%; Nb2O5: 8-20%; BaO: greater than 10% but less than or equal to 22%; Na2O: 8.5-20%; Bi2O3: 0.1-9%.

[0007] Furthermore, the optical glass, expressed as a weight percentage, further contains: ZrO2: 0-8%; and / or Al2O3: 0-3%; and / or CaO: 0-5%; and / or SrO: 0-5%; and / or MgO: 0-5%; and / or K2O: 0-5%; and / or Li2O: 0-3%; and / or Ln2O3: 0-5%; and / or B2O3: 0-4%; and / or ZnO: 0-4%; and / or WO3: 0-4%; and / or P2O5: 0-3%; and / or clarifying agent: 0-1%, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, and Yb2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0008] Optical glass, its composition by weight percentage is as follows: SiO2: 20-32%; TiO2: 21-34%; Nb2O5: 8-20%; BaO: greater than 10% but less than or equal to 22%; Na2O: 8.5-20%; Bi2O3: 0.1-9%; ZrO2: 0-8%; Al2O3: 0-3%; CaO: 0-5%; SrO: 0-5%; MgO: 0-5%. The composition includes: K2O: 0-5%; Li2O: 0-3%; Ln2O3: 0-5%; B2O3: 0-4%; ZnO: 0-4%; WO3: 0-4%; P2O5: 0-3%; and clarifying agent: 0-1%. The Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, and Yb2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0009] Furthermore, the optical glass comprises, by weight percentage, Nb2O5 / SiO2 of 0.3 to 0.9, preferably 0.35 to 0.8, more preferably 0.4 to 0.7, and even more preferably 0.45 to 0.65.

[0010] Furthermore, the optical glass comprises, by weight percentage, Bi2O3 / BaO of 0.01 to 0.8, preferably 0.02 to 0.7, more preferably 0.03 to 0.5, and even more preferably 0.05 to 0.35.

[0011] Furthermore, the composition of the optical glass is expressed as a weight percentage, wherein:

[0012] The ratio of (B2O3+Li2O+ZnO) / Bi2O3 is 1.5 or less, preferably 1.0 or less, more preferably 0.8 or less, and even more preferably 0.5 or less.

[0013] Furthermore, the optical glass comprises, by weight percentage, Bi2O3 / Na2O of 0.01 to 1.0, preferably 0.02 to 0.8, more preferably 0.03 to 0.5, and even more preferably 0.05 to 0.3.

[0014] Furthermore, the optical glass, its composition expressed as a weight percentage, wherein: Nb2O5 / (TiO2+BaO+Bi2O3) is 0.15-0.6, preferably 0.2-0.5, more preferably 0.2-0.45, and even more preferably Nb2O5 /

[0015] The concentration of (TiO2+BaO+Bi2O3) is 0.25-0.4.

[0016] Furthermore, the optical glass, wherein the composition is expressed as a weight percentage, wherein: CaO / Bi2O3 is 2.0 or less, preferably 1.5 or less, more preferably 1.0 or less, and even more preferably 0.1 to 0.8.

[0017] Furthermore, the optical glass comprises, by weight percentage, BaO / (Na2O+SiO2) of 0.2 to 0.66, preferably 0.25 to 0.6, more preferably 0.3 to 0.5, and even more preferably 0.35 to 0.45.

[0018] Furthermore, the composition of the optical glass is expressed as a weight percentage, wherein:

[0019] The ratio of (Na2O+Bi2O3) / (TiO2+ZrO2) is 0.25 to 1.2, preferably 0.3 to 1.0, more preferably 0.35 to 0.8, and even more preferably 0.4 to 0.65.

[0020] Furthermore, the optical glass comprises, by weight percentage, ZnO+CaO+SrO+MgO+Li2O+K2O of 0-8%, preferably ZnO+CaO+SrO+MgO+Li2O+K2O of 0-5%, more preferably ZnO+CaO+SrO+MgO+Li2O+K2O of 0-3%, and even more preferably ZnO+CaO+SrO+MgO+Li2O+K2O of 0-2%.

[0021] Furthermore, the optical glass comprises, by weight percentage: SiO2: 21-30%, preferably SiO2: 23-28%; and / or TiO2: 23-32%, preferably TiO2: 25-30%; and / or Nb2O5: 10-18%, preferably Nb2O5: 12-16%, more preferably Nb2O5: 12-14.5%; and / or BaO: 12-19%, preferably BaO: 14-17%; and / or Na2O: 10-18%, preferably Nb2O5: 14-17%. a2O: 11-15%; and / or Bi2O3: 0.5-7%, preferably Bi2O3: 1-5%; and / or ZrO2: 0.5-6%, preferably ZrO2: 1-4%; and / or Al2O3: 0-2%, preferably Al2O3: 0-1%; and / or CaO: 0-3%, preferably CaO: 0.1-2%; and / or SrO: 0-2%, preferably SrO: 0-1%, more preferably without SrO; and / or MgO: 0-2%, preferably MgO: 0-1%, more preferably without SrO; Contains no MgO; and / or K2O: 0–3%, preferably 0–1%, more preferably no K2O; and / or Li2O: 0–2%, preferably 0–1%, more preferably no Li2O; and / or Ln2O3: 0–3%, preferably 0–1%, more preferably no Ln2O3; and / or B2O3: 0–3%, preferably 0–1%, more preferably no B2O3; and / or ZnO: 0–3%, preferably 0–1%, more preferably no ZnO. It contains no ZnO; and / or WO3: 0-3%, preferably WO3: 0-1%, more preferably no WO3; and / or P2O5: 0-2%, preferably P2O5: 0-1%, more preferably no P2O5; and / or clarifying agent: 0-0.5%, preferably clarifying agent: 0-0.2%, more preferably no clarifying agent, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, and Yb2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0022] Furthermore, the refractive index n of the optical glass d The value is 1.81 to 1.88, preferably 1.82 to...

[0023] 1.87, more preferably 1.83 to 1.86; and / or Abbe number ν d The value is 20 to 27, preferably 21 to 26, and more preferably 22 to 25.

[0024] Furthermore, the λ of the optical glass 70 For wavelengths below 430nm, λ is preferred. 70 For wavelengths below 420nm, λ is preferred. 70The wavelength is 415 nm or less; and / or λ5 is 395 nm or less, preferably 385 nm or less, more preferably 380 nm or less; and / or acid resistance stability RA is Class 2 or more, preferably Class 1; and / or weather resistance CR is Class 2 or more, preferably Class 1; and / or coefficient of thermal expansion α 100～300℃ 125×10 -7 / K or less, preferably 120×10 -7 / K or less, preferably 115×10 -7 Below / K, 97×10 is further preferred. -7 / K~113×10 -7 / K; and / or density ρ is 3.80 g / cm³. 3 The preferred value is 3.70 g / cm³. 3 The preferred value is 3.60 g / cm³. 3 The following is a further preferred value: 3.40–3.60 g / cm³. 3 ; and / or transition temperature T g The temperature is below 650°C, preferably below 640°C, more preferably below 630°C, and even more preferably 601–625°C; and / or the secondary pressing anti-crystallization performance is grade B or higher, preferably grade A; and / or the bubble degree is grade A or higher, preferably grade A0 or higher, more preferably grade A. 00 Grade; and / or stripe density of grade C or above, preferably grade B or above.

[0025] The glass preform is made of the aforementioned optical glass.

[0026] The optical element is made of the optical glass described above, or of the glass preform described above.

[0027] An optical instrument containing the aforementioned optical glass or containing the aforementioned optical elements.

[0028] The beneficial effects of this invention are: through reasonable component design, this invention uses a silicate glass system to obtain optical glass with a refractive index of 1.81 to 1.88 and an Abbe number of 20 to 27. The raw material cost and production cost of the optical glass of this invention are low, and it meets the requirements of environmental protection. Detailed Implementation

[0029] 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.

[0030] Optical Glass

[0031] 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%.

[0032] 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.

[0033] <Essential and Non-essential Components>

[0034] SiO2 is the network generator of the glass of this invention, possessing the functions of maintaining the chemical stability of the glass, a viscosity suitable for molten glass forming, improving the glass's resistance to devitrification, and reducing the erosion of molten glass on refractory materials. If the SiO2 content is below 20%, it is difficult to achieve the above effects; therefore, the lower limit of the SiO2 content is 20%, preferably 21%, and more preferably 23%. If the SiO2 content is above 32%, the meltability of the glass decreases, and the transition temperature increases. Therefore, the upper limit of the SiO2 content is 32%, preferably 30%, and more preferably 28%. In some embodiments, the SiO2 may be included in the form of 20%, 20.5%, 21%, 21.5%, 22%, 22.5%, 23%, 23.5%, 24%, 24.5%, 25%, 25.5%, 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, or 32%.

[0035] TiO2 improves the refractive index and dispersion of glass, and enhances its resistance to devitrification. In this invention, containing an appropriate amount of TiO2 makes the glass more stable and reduces its high-temperature viscosity. This invention achieves these effects by containing 21% or more TiO2, preferably 23% or more, and more preferably 25% or more. If the TiO2 content exceeds 34%, the glass's tendency to crystallize and color increases, and its transition temperature rises. Therefore, in this invention, the TiO2 content is 34% or less, preferably 32% or less, and more preferably 30% or less. In some embodiments, the composition may include 21%, 21.5%, 22%, 22.5%, 23%, 23.5%, 24%, 24.5%, 25%, 25.5%, 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, or 34% TiO2.

[0036] Nb₂O₅ is a high-refractive-index and high-dispersion component that can improve the devitrification resistance of glass and reduce its coefficient of thermal expansion. This invention achieves these effects by containing at least 8% Nb₂O₅, preferably at 10% or more, and more preferably at 12% or more. If the Nb₂O₅ content exceeds 20%, the weather resistance and light transmittance of the glass decrease, and the glass transition temperature increases. Therefore, the upper limit of the Nb₂O₅ content in this invention is 20%, preferably 18%, more preferably 16%, and even more preferably 14.5%. In some embodiments, Nb2O5 may be included in the form of 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, or 20%.

[0037] In some embodiments, controlling the Nb₂O₅ content to SiO₂ content ratio (Nb₂O₅ / SiO₂) within the range of 0.3 to 0.9 allows the glass of the present invention to achieve excellent thermal expansion coefficient and transition temperature while improving the light transmittance of the glass. Therefore, a Nb₂O₅ / SiO₂ ratio of 0.3 to 0.9 is preferred, more preferably 0.35 to 0.8, further preferably 0.4 to 0.7, and even more preferably 0.45 to 0.65. In some embodiments, the Nb₂O₅ / SiO₂ value can be 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9.

[0038] Bi₂O₃ is an essential component of the optical glass of this invention. In this invention, it can improve the glass's resistance to crystallization during secondary molding and optimize its mechanical properties. However, if its content is too high, the chemical stability of the glass decreases. Therefore, the content of Bi₂O₃ is 0.1% to 9%, preferably 0.5% to 7%, and more preferably 1% to 5%. In some embodiments, it may contain 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, or 9% Bi₂O₃.

[0039] In this invention, BaO can improve the refractive index, devitrification resistance, and melt permeability of the glass, preventing a decrease in light transmittance and devitrification after secondary molding. This invention achieves these effects by containing more than 10% BaO, preferably with a lower limit of 12%, and more preferably 14%. On the other hand, if the BaO content exceeds 22%, the chemical stability of the glass deteriorates, and the density increases significantly. Therefore, the upper limit of the BaO content is 22%, preferably 19%, and more preferably 17%. In some embodiments, the product may contain more than 10%, 10.1%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, 20.5%, 21%, 21.5%, or 22% BaO.

[0040] In some embodiments, controlling the Bi2O3 / BaO ratio within the range of 0.01 to 0.8 can improve the glass's resistance to crystallization during secondary molding and reduce streaking, thereby optimizing the glass's coefficient of thermal expansion. Therefore, a Bi2O3 / BaO ratio of 0.01 to 0.8 is preferred, more preferably 0.02 to 0.7, even more preferably 0.03 to 0.5, and still more preferably 0.05 to 0.35. In some implementations, the Bi2O3 / BaO value can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, or 0.8.

[0041] In some embodiments, controlling the Nb2O5 content to the total content of TiO2, BaO, and Bi2O3 (TiO2+BaO+Bi2O3), the ratio Nb2O5 / (TiO2+BaO+Bi2O3), within the range of 0.15 to 0.6, is beneficial for improving the bubble content of the glass and reducing its density. Therefore, Nb2O5 /

[0042] The ratio of Nb2O5 / (TiO2+BaO+Bi2O3) is 0.15 to 0.6, more preferably 0.2 to 0.5, even more preferably 0.2 to 0.45, and still more preferably 0.25 to 0.4. In some embodiments, the value of Nb2O5 / (TiO2+BaO+Bi2O3) can be 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, or 0. 34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6.

[0043] SrO can increase the refractive index of glass and improve its melting performance, but if its content is too high, the glass's resistance to crystallization decreases, and the cost of the glass also increases rapidly. Therefore, the SrO content is 0-5%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is further preferred that no SrO is contained. In some embodiments, it may contain 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5% SrO.

[0044] CaO helps improve the refractive index and hardness of glass and optimizes its abrasion resistance. However, if the CaO content is too high, it will lead to a decrease in the glass's resistance to crystallization. Therefore, the CaO content is 0-5%, preferably 0-3%, and more preferably 0.1-2%. In some embodiments, it may contain 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5% CaO.

[0045] In some embodiments, controlling the ratio of CaO to Bi2O3 content (CaO / Bi2O3) to be below 2.0 can improve the chemical stability and striation of the glass, and optimize the coefficient of thermal expansion of the glass. Therefore, it is preferable that the CaO / Bi2O3 ratio is below 2.0, more preferably below 1.5, further preferably below 1.0, and even more preferably from 0.1 to 0.8. In some implementations, the value of CaO / Bi2O3 can be 0, greater than 0, 0.01, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, or 2.0.

[0046] MgO can reduce the relative partial dispersion of glass, but if the MgO content is too high, the refractive index of the glass is difficult to meet the design requirements, and the anti-crystallization performance and stability of the glass decrease. Therefore, the MgO content is 0-5%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is further preferred that no MgO is contained. In some embodiments, MgO may be contained in the form of 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%.

[0047] Li₂O can lower the glass transition temperature and improve the glass's melting properties, but high Li₂O content is detrimental to the glass's chemical stability, resistance to crystallization, and coefficient of thermal expansion. Therefore, in this invention, the Li₂O content is 3% or less, preferably 2% or less, and more preferably 1% or less. In some embodiments, it is further preferred that the glass does not contain Li₂O. In some embodiments, the product may contain 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, or 3% Li₂O.

[0048] Na₂O can improve the chemical stability of glass and enhance its resistance to crystallization during secondary molding. In this invention, the above effects are achieved by containing 8.5% or more Na₂O, preferably 10% or more, and more preferably 11% or more. On the other hand, if the Na₂O content is too high, the refractive index of the glass may not meet the design requirements. Therefore, the Na₂O content is 20% or less, preferably 18% or less, and more preferably 15% or less. In some embodiments, Na₂O may be included in amounts of 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, and 20%.

[0049] In some embodiments, controlling the ratio of Bi2O3 to Na2O (Bi2O3 / Na2O) within the range of 0.01 to 1.0 can improve the glass's resistance to crystallization during secondary molding and optimize its bubble content and chemical stability. Therefore, a Bi2O3 / Na2O ratio of 0.01 to 1.0 is preferred, more preferably 0.02 to 0.8, further preferably 0.03 to 0.5, and even more preferably 0.05 to 0.3. In some implementations, the Bi2O3 / Na2O value can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, or 1.0.

[0050] In some embodiments, controlling the ratio of BaO content to the total content of Na2O and SiO2 (Na2O+SiO2), BaO / (Na2O+SiO2), within the range of 0.2 to 0.66, can improve the weather resistance and streaking of the glass and optimize the glass transition temperature. Therefore, it is preferable that BaO / (Na2O+SiO2) is 0.2 to 0.66, more preferably 0.25 to 0.6, further preferably 0.3 to 0.5, and even more preferably 0.35 to 0.45. In some embodiments, the value of BaO / (Na2O+SiO2) can be 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, or 0.4. 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66.

[0051] K₂O improves the thermal stability and melt properties of glass, but its content exceeding 5% deteriorates the glass's resistance to devitrification and chemical stability. Therefore, the K₂O content in this invention is 5% or less, preferably 3% or less, and more preferably 1% or less. In some embodiments, it is further preferred that K₂O is not present. In some embodiments, K₂O may be included in the following amounts: 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, and 5%.

[0052] ZrO2 can improve the refractive index and devitrification resistance of glass, as well as its chemical stability and mechanical properties. However, if its content is too high, the melting difficulty of the glass increases, making it prone to inclusions and a decrease in light transmittance, while also reducing the glass's resistance to crystallization. Therefore, the ZrO2 content is 0-8%, preferably 0.5-6%, and more preferably 1-4%. In some embodiments, it may contain 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, or 8% ZrO2.

[0053] In some embodiments, controlling the ratio (Na2O+Bi2O3) / (TiO2+ZrO2) between the total content of Na2O and Bi2O3 (Na2O+Bi2O3) and the total content of TiO2 and ZrO2 (TiO2+ZrO2) (Na2O+Bi2O3) and the total content of TiO2 and ZrO2 (TiO2+ZrO2) within the range of 0.25 to 1.2 can improve the glass's resistance to crystallization during secondary molding and its chemical stability, while reducing the glass's density. Therefore, it is preferable that (Na2O+Bi2O3) / (TiO2+ZrO2) is 0.25 to 1.2, more preferably (Na2O+Bi2O3) / (TiO2+ZrO2) is 0.3 to 1.0, and even more preferably (Na2O+Bi2O3) /

[0054] The ratio of (TiO2+ZrO2) is 0.35 to 0.8, and more preferably (Na2O+Bi2O3) / (TiO2+ZrO2) is 0.4 to 0.65. In some embodiments, the value of (Na2O+Bi2O3) / (TiO2+ZrO2) can be 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, or 0.4. 8, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2.

[0055] Al2O3 can improve the chemical stability of glass, but if its content is too high, the glass's resistance to devitrification and its meltability will decrease, and it will easily lead to crystallization during secondary molding. Therefore, the content of Al2O3 is 3% or less, preferably 2% or less, and more preferably 1% or less. In some embodiments, it may contain 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, or 3% Al2O3.

[0056] Ln2O3 (Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, and Yb2O3) is a component that improves the refractive index and chemical stability of glass. By controlling the Ln2O3 content to below 5%, the devitrification resistance of the glass can be prevented from decreasing. Preferably, the upper limit of the Ln2O3 content range is 3%, more preferably 1%. In some embodiments, it is further preferred that Ln2O3 is not present. In some embodiments, Ln2O3 may be included in the following amounts: 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, and 5%.

[0057] B2O3 can improve the meltability of glass; however, if its content is too high, the refractive index of the glass decreases, and the resistance to crystallization during secondary molding deteriorates. Therefore, in this invention, the content of B2O3 is 4% or less, preferably 3% or less, and more preferably 1% or less. In some embodiments, it is further preferred that the glass does not contain B2O3. In some embodiments, the composition may include 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.5%, and 4% B2O3.

[0058] ZnO can lower the glass transition temperature. However, if its content is too high, the glass's resistance to crystallization decreases, and its high-temperature viscosity is low, making molding difficult. Therefore, the ZnO content in this invention is 0-4%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that it does not contain ZnO. In some embodiments, it may contain 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, or 4% ZnO.

[0059] In some embodiments, controlling the total content of ZnO, CaO, SrO, MgO, Li2O, and K2O (ZnO+CaO+SrO+MgO+Li2O+K2O) to below 8% can improve the glass's weather resistance while maintaining high light transmittance. Therefore, it is preferable that the content of ZnO+CaO+SrO+MgO+Li2O+K2O is 0-8%, more preferably 0-5%, even more preferably 0-3%, and still more preferably...

[0060] The concentration of ZnO+CaO+SrO+MgO+Li2O+K2O is 0-2%. In some embodiments, the concentration of ZnO+CaO+SrO+MgO+Li2O+K2O can be 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, or 8%.

[0061] In some embodiments, controlling the ratio between the total content of B2O3, Li2O, and ZnO (B2O3+Li2O+ZnO) and the content of Bi2O3 (B2O3+Li2O+ZnO) / Bi2O3 to be below 1.5 can improve the bubble content of the glass and prevent the weather resistance from deteriorating. Therefore, it is preferable that (B2O3+Li2O+ZnO) / Bi2O3 is below 1.5, more preferably (B2O3+Li2O+ZnO) / Bi2O3 is below 1.0, further preferably (B2O3+Li2O+ZnO) / Bi2O3 is below 0.8, and even more preferably (B2O3+Li2O+ZnO) / Bi2O3 is below 0.5. In some implementations, the value of (B2O3+Li2O+ZnO) / Bi2O3 can be 0, greater than 0, 0.01, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, or 1.5.

[0062] WO3 can improve the refractive index and dispersion of glass. However, if its content is too high, the light transmittance of the glass decreases, and the resistance to crystallization during secondary molding deteriorates. Therefore, the WO3 content in this invention is 0-4%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that WO3 is not present. In some embodiments, WO3 may be included in the following amounts: 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, and 4%.

[0063] P2O5 can improve the devitrification resistance of glass, but if its content is too high, the chemical stability of the glass will decrease, and P2O5 is easily volatilized during production, which has a significant impact on the environment and the consistency of glass performance. Therefore, the P2O5 content is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is further preferred that it does not contain P2O5. In some embodiments, it may contain 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, or 3% P2O5.

[0064] In some embodiments of the present invention, the clarification effect and bubble content of the glass can be improved by using one or more components selected from Sb₂O₃, SnO₂, and CeO₂ as a clarifying agent, which contains 0-1% of these components. Preferably, the content of the clarifying agent is 0-0.5%, more preferably 0-0.2%. Since the optical glass of the present invention has a reasonable design in terms of component types and contents, and its bubble content is excellent, it is further preferred in some embodiments to not contain a clarifying agent. 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, the present invention preferably has an Sb₂O₃ content of 0-1%, more preferably 0-0.5%, further preferably 0-0.2%, and even more preferably no 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 again, Sn becomes the starting point for crystal nucleation, resulting in a tendency for devitrification. Therefore, the SnO2 content in this invention is preferably 0-1%, more preferably 0-0.5%, further preferably 0-0.2%, and even more preferably does not contain SnO2. The function and content of CeO2 are the same as SnO2, and its content is preferably 0-1%, more preferably 0-0.5%, further preferably 0-0.2%, and even more preferably does not contain CeO2. In some embodiments, a clarifying agent may be included in amounts of 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, and 1%. In some embodiments, the composition may include 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1% Sb₂O₃. In some embodiments, the composition may include 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1% SnO₂. In some implementations, CeO2 may be included in amounts of 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, and 1%.

[0065] <Components that should not be present>

[0066] 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.

[0067] 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. This results in optical glass that is virtually free of pollutants. Consequently, the optical glass of this invention can be manufactured, processed, and disposed of even without specific environmental countermeasures. Furthermore, to achieve environmental friendliness, the optical glass of this invention preferably does not contain As₂O₃ and PbO.

[0068] 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.

[0069] The performance of the optical glass of the present invention will be described below:

[0070] <Refractive Index and Abbe Number>

[0071] Refractive index of optical glass (n) d ) and Abbe number (ν d Test according to the method specified in GB / T 7962.1—2010.

[0072] In some embodiments, the refractive index (n) of the optical glass of the present invention d The upper limit of ) is 1.88, the preferred upper limit is 1.87, and the more preferred upper limit is 1.86.

[0073] In some embodiments, the refractive index (n) of the optical glass of the present invention d The lower limit is 1.81, the preferred lower limit is 1.82, and the more preferred lower limit is 1.83.

[0074] In some embodiments, the refractive index (n) of the optical glass of the present invention d The possible values ​​are 1.81, 1.815, 1.82, 1.825, 1.83, 1.835, 1.84, 1.845, 1.85, 1.855, 1.86, 1.865, 1.87, 1.875, and 1.88.

[0075] In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The upper limit of ) is 27, the preferred upper limit is 26, and the more preferred upper limit is 25.

[0076] In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The lower limit is 20, the preferred lower limit is 21, and the more preferred lower limit is 22.

[0077] In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The possible values ​​are 20, 20.5, 21, 21.5, 22, 22.5, 23, 23.5, 24, 24.5, 25, 25.5, 26, 26.5, and 27.

[0078] <Colorization>

[0079] The short-wavelength transmission spectral characteristics of the glass of this invention are expressed using colorimetric intensity (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.

[0080] 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 415nm.

[0081] In some embodiments, the λ5 of the optical glass of the present invention is 395 nm or less, preferably 385 nm or less, and more preferably 380 nm or less.

[0082] <Acid resistance>

[0083] The acid resistance stability (RA) (surface method) of optical glass was tested according to the method specified in GB / T 7962.14-2010.

[0084] In some embodiments, the acid resistance (RA) of the optical glass of the present invention is Class 2 or above, preferably Class 1.

[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. Weather Resistance Classification Table

[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] Coefficient of thermal expansion

[0091] 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.

[0092] In some embodiments, the coefficient of thermal expansion (α) of the optical glass of the present invention is... 100～300℃ ) is 125×10 -7 / K or less, preferably 120×10 -7 / K or less, preferably 115×10 -7 Below / K, 97×10 is further preferred. -7 / K~113×10 -7 / K.

[0093] <Density>

[0094] The density (ρ) of optical glass is tested according to the method specified in GB / T7962.20-2010.

[0095] In some embodiments, the density (ρ) of the optical glass of the present invention is 3.80 g / cm³.3 The preferred value is 3.70 g / cm³. 3 The preferred value is 3.60 g / cm³. 3 The following is a further preferred value: 3.40–3.60 g / cm³. 3 .

[0096] <Transition Temperature>

[0097] Transition temperature of optical glass (T) g The test shall be conducted in accordance with the method specified in GB / T7962.16—2010.

[0098] In some embodiments, the transition temperature (T) of the optical glass of the present invention is... g The temperature is below 650°C, preferably below 640°C, more preferably below 630°C, and even more preferably 601–625°C.

[0099] <Resistant Crystallization Properties in Secondary Molding>

[0100] The test method for the secondary molding anti-crystallization performance is as follows: cut the sample glass into 20×20×10mm pieces and place them in a container at a temperature of T. g Hold the glass sample in a muffle furnace at +(200~250)℃ for 15~30 minutes (this invention uses 830℃ for 30 minutes). After cooling, observe the glass surface and interior for any devitrification or crystal particles. If the glass sample has no devitrification or crystal particles, then the glass exhibits excellent resistance to crystallization during secondary molding.

[0101] In the secondary molding anti-crystallization performance test, according to the aforementioned test method, glass with no devitrification or crystal grains on the surface and no crystal grains inside is recorded as "A", glass with no crystal grains inside but devitrification or crystal grains on the surface layer is recorded as "B" (devitrification or crystal grains on the surface of glass during secondary molding can be removed by grinding, but this may increase grinding costs), glass with 1 to 10 crystal grains inside is recorded as "C", glass with 10 to 20 crystal grains inside is recorded as "D", and glass with more than 20 dense crystal grains inside is recorded as "×".

[0102] In some embodiments, the secondary molding anti-crystallization performance of the optical glass of the present invention is grade B or above, preferably grade A.

[0103] <Effervescence>

[0104] The bubble content of optical glass shall be tested according to the method specified in GB / T7962.8-2010.

[0105] 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.

[0106] <Stripe>

[0107] The striae of the glass are checked by comparing it with a standard sample from the direction in which the striae are most easily visible using a striameter consisting of a point light source and a lens. The striae are divided into 4 levels, as detailed in Table 2 below.

[0108] Table 2. Stripe Grading Table

[0109] grade stripe intensity A No visible streaks were observed under the specified testing conditions. B Under the specified testing conditions, it exhibits fine and dispersed streaks. C Slight parallel streaks are present under the specified testing conditions. D Under the specified testing conditions, there are coarse parallel stripes.

[0110] In some embodiments, the striation of the optical glass of this invention is grade C or higher, preferably grade B or higher.

[0111] [Manufacturing Method]

[0112] 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 oxides, hydroxides, fluorides, and various salts (carbonates, nitrates, sulfates, phosphates, metaphosphates), etc. After being batched according to conventional methods, the batched material is melted in a melting furnace (such as a platinum crucible) at 1000–1400°C. 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.

[0113] [Glass preforms and optical components]

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] [Optical Instruments]

[0119] 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.

[0120] Example

[0121] <Example of Optical Glass>

[0122] To further illustrate and explain the technical solution of the present invention, the following non-limiting embodiments are provided.

[0123] In this embodiment, optical glass with the composition shown in Tables 3 to 5 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 3 to 5.

[0124] Table 3.

[0125]

[0126]

[0127] Table 4.

[0128]

[0129]

[0130]

[0131] Table 5.

[0132]

[0133]

[0134] <Example of Glass Prefabricated Components>

[0135] The glass obtained from Examples 1 to 24 of the optical glass 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.

[0136] <Optical Component Examples>

[0137] Annealing these preforms obtained from the above glass preform examples reduces internal deformation of the glass while fine-tuning them so that optical properties such as refractive index reach the desired values.

[0138] 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.

[0139] <Examples of Optical Instruments>

[0140] 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. They 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, photolithography, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips, or for camera equipment and devices in the automotive field.

Claims

1. Optical glass, characterized by comprise, in percent by weight: SiO2: 20 to 32%; TiO2: 21 to 34%; Nb2O5: 8 to 20%; BaO: more than 10% but less than or equal to 22%; Na2O: 8.5 to 20%; Bi2O3: 0.1 to 9%.

2. The optical glass according to claim 1, characterized by comprise, in percent by weight: SiO2: 20 to 32%; TiO2: 21 to 34%; Nb2O5: 8 to 20%; BaO: more than 10% but less than or equal to 22%; Na2O: 8.5 to 20%; Bi2O3: 0.1 to 9%; ZrO2: 0 to 8%; Al2O3: 0 to 3%; CaO: 0 to 5%; SrO: 0 to 5%; MgO: 0 to 5%; K2O: 0 to 5%; Li2O: 0 to 3%; Ln2O3: 0 to 5%; B2O3: 0 to 4%; ZnO: 0 to 4%; WO3: 0 to 4%; P2O5: 0 to 3%; clarifier: 0 to 1%, said Ln2O3 being one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and the clarifier being one or more of Sb2O3, SnO2 and CeO2.

3. Optical glass, characterized by comprise, in percent by weight: SiO2: 20 to 32%; TiO2: 21 to 34%; Nb2O5: 8 to 20%; BaO: more than 10% but less than or equal to 22%; Na2O: 8.5 to 20%; Bi2O3: 0.1 to 9%; ZrO2: 0 to 8%; Al2O3: 0 to 3%; CaO: 0 to 5%; SrO: 0 to 5%; MgO: 0 to 5%; K2O: 0 to 5%; Li2O: 0 to 3%; Ln2O3: 0 to 5%; B2O3: 0 to 4%; ZnO: 0 to 4%; WO3: 0 to 4%; P2O5: 0 to 3%; clarifier: 0 to 1%, said Ln2O3 being one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and the clarifier being one or more of Sb2O3, SnO2 and CeO2. comprise, in percent by weight: SiO2: 20 to 32%; TiO2: 21 to 34%; Nb2O5: 8 to 20%; BaO: more than 10% but less than or equal to 22%; Na2O: 8.5 to 20%; Bi2O3: 0.1 to 9%; ZrO2: 0 to 8%; Al2O3: 0 to 3%; CaO: 0 to 5%; SrO: 0 to 5%; MgO: 0 to 5%; K2O: 0 to 5%; Li2O: 0 to 3%; Ln2O3: 0 to 5%; B2O3: 0 to 4%; ZnO: 0 to 4%; WO3: 0 to 4%; P2O5: 0 to 3%; clarifier: 0 to 1%, said Ln2O3 being one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and the clarifier being one or more of Sb2O3, SnO2 and CeO2. comprise, in percent by weight: SiO2: 20 to 32%; TiO2: 21 to 34%; Nb2O5: 8 to 20%; BaO: more than 10% but less than or equal to 22%; Na2O: 8.5 to 20%; Bi2O3: 0.1 to 9%; ZrO2: 0 to 8%; Al2O3: 0 to 3%; CaO: 0 to 5%; SrO: 0 to 5%; MgO: 0 to 5%; K2O: 0 to 5%; Li2O: 0 to 3%; Ln2O3: 0 to 5%; B2O3: 0 to 4%; ZnO: 0 to 4%; WO3: 0 to 4%; P2O5: 0 to 3%; clarifier: 0 to 1%, said Ln2O3 being one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and the clarifier being one or more of Sb2O3, SnO2 and CeO2. comprise, in percent by weight: SiO2: 20 to 32%; TiO2: 21 to 34%; Nb2O5: 8 to 20%; BaO: more than 10% but less than or equal to 22%; Na2O: 8.5 to 20%; Bi2O3: 0.1 to 9%; ZrO2: 0 to 8%; Al2O3: 0 to 3%; CaO: 0 to 5%; SrO: 0 to 5%; MgO: 0 to 5%; K2O: 0 to 5%; Li2O: 0 to 3%; Ln2O3: 0 to 5%; B2O3: 0 to 4%; ZnO: 0 to 4%; WO3: 0 to 4%; P2O5: 0 to 3%; clarifier: 0 to 1%, said Ln2O3 being one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and the clarifier being one or more of Sb2O3, SnO2 and CeO2.

4. The optical glass according to any one of claims 1 to 3, characterized by ​ 5. The optical glass according to any one of claims 1 to 3, characterized by ​ 6. The optical glass according to any one of claims 1 to 3, characterized by ​ 7. The optical glass according to any one of claims 1 to 3, characterized by its components are expressed in percent by weight, wherein: Bi2O3 / Na2O is from 0.01 to 1.0, preferably Bi2O3 / Na2O is from 0.02 to 0.8, more preferably Bi2O3 / Na2O is from 0.03 to 0.5, further preferably Bi2O3 / Na2O is from 0.05 to 0.

3.

8. The optical glass according to any one of claims 1 to 3, characterized by its components are expressed in percent by weight, wherein: Nb2O5 / (TiO2+BaO+Bi2O3) is from 0.15 to 0.6, preferably Nb2O5 / (TiO2+BaO+Bi2O3) is from 0.2 to 0.5, more preferably Nb2O5 / (TiO2+BaO+Bi2O3) is from 0.25 to 0.45, further preferably Nb2O5 / (TiO2+BaO+Bi2O3) is from 0.3 to 0.

4. its components are expressed in percent by weight, wherein: Nb2O5 / (TiO2+BaO+Bi2O3) is from 0.15 to 0.6, preferably Nb2O5 / (TiO2+BaO+Bi2O3) is from 0.2 to 0.5, more preferably Nb2O5 / (TiO2+BaO+Bi2O3) is from 0.25 to 0.45, further preferably Nb2O5 / (TiO2+BaO+Bi2O3) is from 0.3 to 0.

4.

9. The optical glass according to any one of claims 1 to 3, characterized by, its components are expressed in percent by weight, wherein: CaO / Bi2O3 is 2.0 or less, preferably CaO / Bi2O3 is 1.5 or less, more preferably CaO / Bi2O3 is 1.0 or less, further preferably CaO / Bi2O3 is from 0.1 to 0.

8.

10. The optical glass according to any one of claims 1 to 3, characterized by, its components are expressed in percent by weight, wherein: BaO / (Na2O+SiO2) is from 0.2 to 0.66, preferably BaO / (Na2O+SiO2) is from 0.25 to 0.6, more preferably BaO / (Na2O+SiO2) is from 0.3 to 0.5, further preferably BaO / (Na2O+SiO2) is from 0.35 to 0.

45.

11. The optical glass according to any one of claims 1 to 3, characterized by its components are expressed in percent by weight, wherein: (Na2O+Bi2O3) / (TiO2+ZrO2) is from 0.25 to 1.2, preferably (Na2O+Bi2O3) / (TiO2+ZrO2) is from 0.3 to 1.0, more preferably (Na2O+Bi2O3) / (TiO2+ZrO2) is from 0.35 to 0.8, further preferably (Na2O+Bi2O3) / (TiO2+ZrO2) is from 0.4 to 0.

65.

12. The optical glass according to any one of claims 1 to 3, characterized by its components are expressed in percent by weight, wherein: ZnO+CaO+SrO+MgO+Li2O+K2O is from 0 to 8%, preferably ZnO+CaO+SrO+MgO+Li2O+K2O is from 0 to 5%, more preferably ZnO+CaO+SrO+MgO+Li2O+K2O is from 0 to 3%, further preferably ZnO+CaO+SrO+MgO+Li2O+K2O is from 0 to 2%.

13. The optical glass according to any one of claims 1 to 3, characterized by, of which the components are expressed in percentage by weight, in which: SiO2: 21 to 30%, preferably SiO2: 23 to 28%; and / or TiO2: 23 to 32%, preferably TiO2: 25 to 30%; and / or Nb2O5: 10 to 18%, preferably Nb2O5: 12 to 16%, more preferably Nb2O5: 12 to 14.5%; and / or BaO: 12 to 19%, preferably BaO: 14 to 17%; and / or Na2O: 10 to 18%, preferably Na2O: 11 to 15%; and / or Bi2O3: 0.5 to 7%, preferably Bi2O3: 1 to 5%; and / or ZrO2: 0.5 to 6%, preferably ZrO2: 1 to 4%; and / or Al2O3: 0 to 2%, preferably Al2O3: 0 to 1%; and / or CaO: 0 to 3%, preferably CaO: 0.1 to 2%; and / or SrO: 0 to 2%, preferably SrO: 0 to 1%, more preferably free of SrO; and / or MgO: 0 to 2%, preferably MgO: 0 to 1%, more preferably free of MgO; and / or K2O: 0 to 3%, preferably K2O: 0 to 1%, more preferably free of K2O; and / or Li2O: 0 to 2%, preferably Li2O: 0 to 1%, more preferably free of Li2O; and / or Ln2O3: 0 to 3%, preferably Ln2O3: 0 to 1%, more preferably free of Ln2O3; and / or B2O3: 0 to 3%, preferably B2O3: 0 to 1%, more preferably free of B2O3; and / or ZnO: 0 to 3%, preferably ZnO: 0 to 1%, more preferably free of ZnO; and / or WO3: 0 to 3%, preferably WO3: 0 to 1%, more preferably free of WO3; and / or P2O5: 0 to 2%, preferably P2O5: 0 to 1%, more preferably free of P2O5; and / or fining agent: 0 to 0.5%, preferably fining agent: 0 to 0.2%, more preferably free of fining agent, said Ln2O3 being one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and the fining agent being one or more of Sb2O3, SnO2 and CeO2.

14. The optical glass according to any one of claims 1 to 3, characterized by, The optical glass has a refractive index n d of 1.81 to 1.88, preferably 1.82 to 1.87, more preferably 1.83 to 1.86; and / or an Abbe number v d of 20 to 27, preferably 21 to 26, more preferably 22 to 25.

15. The optical glass according to any one of claims 1 to 3, characterized by The λ of the optical glass 70 For wavelengths below 430nm, λ is preferred. 70 For wavelengths below 420nm, λ is preferred. 70 The wavelength is 415 nm or less; and / or λ5 is 395 nm or less, preferably 385 nm or less, more preferably 380 nm or less; and / or acid resistance stability RA is Class 2 or more, preferably Class 1; and / or weather resistance CR is Class 2 or more, preferably Class 1; and / or coefficient of thermal expansion α 100～300℃ 125×10 -7 / K or less, preferably 120×10 -7 / K or less, preferably 115×10 -7 Below / K, 97×10 is further preferred. -7 / K~113×10 -7 / K; and / or density ρ is 3.80 g / cm³. 3 The preferred value is 3.70 g / cm³. 3 The preferred value is 3.60 g / cm³. 3 The following is a further preferred value: 3.40–3.60 g / cm³. 3 ; and / or transition temperature T g The temperature is below 650°C, preferably below 640°C, more preferably below 630°C, and even more preferably 601–625°C; and / or the secondary pressing anti-crystallization performance is grade B or higher, preferably grade A; and / or the bubble degree is grade A or higher, preferably grade A0 or higher, more preferably grade A. 00 Grade; and / or stripe density of grade C or above, preferably grade B or above.

16. Glass preform, characterized in that, An optical glass according to any one of claims 1 to 15 is used.

17. An optical element, characterized by, An optical glass according to any one of claims 1 to 15 is used, or a glass preform according to claim 16 is used.

18. Optical instrument, characterized in that An optical element according to claim 17 is used, or an optical glass according to any one of claims 1 to 15 is used.

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