Optical glass, optical element and optical instrument

Abstract

The invention relates to optical glass, an optical element and an optical instrument. The optical glass comprises the following components in percentage by weight: 38-65% of SiO2; li2O: 2 to 7%; 5 to 12 percent of Na2O; 1 to 8 percent of SrO; 0 to 10 percent of BaO; 2 to 12 percent of B2O3; zrO2: 2-10%, wherein the ratio of (SrO + BaO) / B2O3 is 0.75-2.70. Through reasonable component design, the optical glass disclosed by the invention has higher hardness while having expected refractive index and Abbe number.

Description

Technical Field

[0001] This invention relates to an optical glass, and more particularly to an optical glass with high hardness, as well as glass preforms, optical elements and optical instruments made therefrom. Background Technology

[0002] In recent years, the rapid development of digitalization and high precision in equipment using optical systems has led to a surge in demand for reducing the number of optical components such as lenses and prisms used in various optical devices, including digital cameras, camcorders, and image reproduction (projection) equipment such as projectors and screen-sharing televisions. This has resulted in a significant need for overall lightweighting and miniaturization of optical systems. Among optical glasses used to manufacture these components, there is a substantial demand for optical glasses with refractive indices of 1.550–1.600 and Abbe numbers of 55.00–60.00, which contribute to overall lightweighting and miniaturization of optical systems. Optical instruments (such as imaging equipment and optical devices) inevitably encounter drops or impacts from hard objects during use. This necessitates that the optical glass used in these instruments possess high hardness to prevent damage during use and extend the lifespan of the optical instruments. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an optical glass with a refractive index of 1.550 to 1.600, an Abbe number of 55.00 to 60.00, and high hardness.

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

[0005] Optical glass, whose composition is expressed as a weight percentage, contains: SiO2: 38-65%; Li2O: 2-7%; Na2O: 5-12%; SrO: 1-8%; BaO: 0-10%; B2O3: 2-12%; ZrO2: 2-10%, wherein the ratio of (SrO+BaO) / B2O3 is 0.75-2.70.

[0006] Furthermore, its components, expressed as a weight percentage, also contain: K2O: 0–2%; and / or MgO: 0–5%; and / or ZnO: 0–10%; and / or Al2O3: 0–10%; and / or GeO2: 0–2%; and / or TiO2: 0–1%; and / or La2O3: 0–4%; and / or Y2O3: 0–6%; and / or Nb2O5: 0–2%; and / or Sb2O3: 0–0.6%; and / or SnO2: 0–1%.

[0007] The optical glass comprises SiO2, Li2O, Na2O, SrO, B2O3, and ZrO2, and contains 0–10% BaO by weight, wherein the (SrO+BaO) / B2O3 ratio is 0.75–2.70. The optical glass has a refractive index of 1.550–1.600, an Abbe number of 55.00–60.00, and a microkernel hardness of 55 × 10⁻⁶. 9 Pa or above.

[0008] Furthermore, its components, expressed as weight percentages, contain: SiO2: 38–65%; and / or Li2O: 2–7%; and / or Na2O: 5–12%; and / or SrO: 1–8%; and / or B2O3: 2–12%; and / or ZrO2: 2–10%; and / or K2O: 0–2%; and / or MgO: 0–5%; and / or ZnO: 0–10%; and / or Al2O3: 0–10%; and / or GeO2: 0–2%; and / or TiO2: 0–1%; and / or La2O3: 0–4%; and / or Y2O3: 0–6%; and / or Nb2O5: 0–2%; and / or Sb2O3: 0–0.6%; and / or SnO2: 0–1%.

[0009] Furthermore, its components are expressed as weight percentages, wherein: Li₂O / (Li₂O+Na₂O) is 0.20–0.45, preferably 0.25–0.40, more preferably 0.30–0.36; and / or (MgO+ZnO) / Na₂O is 0.20–1.25, preferably 0.30–1.00, more preferably 0.40–0.80; and / or (SrO+Ba The ratio of (SrO+BaO) / B2O3 is 0.90–2.00, preferably 1.00–1.50; and / or the ratio of Li2O / ZrO2 is 0.50–1.75, preferably 0.60–1.20, more preferably 0.70–0.90; and / or the ratio of (ZnO+B2O3) / ZrO2 is 1.33–4.00, preferably 1.66–3.50, more preferably 2.00–3.00.

[0010] Furthermore, its components are expressed as weight percentages, wherein: SiO2: 44–61%, preferably SiO2: 50–57%; and / or Li2O: 2.5–6.5%, preferably Li2O: 3–6%; and / or Na2O: 6–11.5%, preferably Na2O: 7–11%; and / or SrO: 1.5–7%, preferably SrO: 2–6%; and / or BaO: 1–9%, preferably BaO: 2–8%; and / or B2O3: 3–11%, preferably B2O3: 4–10%; and / or ZrO2: 3–9%, preferably ZrO2: 4–8%; and / or Or K2O: 0–1%; and / or MgO: 0–4%, preferably MgO: 0.5–3%; and / or ZnO: 0–8%, preferably ZnO: 2–6%; and / or Al2O3: 0–5%; and / or GeO2: 0–0.5%; and / or TiO2: 0–0.5%; and / or La2O3: 0–1%; and / or Y2O3: 0–1.5%; and / or Nb2O5: 0–1%; and / or Sb2O3: 0–0.4%, preferably Sb2O3: 0.1–0.3%; and / or SnO2: 0–0.8%, preferably SnO2: 0–0.6%.

[0011] Furthermore, its components do not contain K2O; and / or Al2O3; and / or GeO2; and / or TiO2; and / or La2O3; and / or Y2O3; and / or Nb2O5; and / or CeO2; and / or CaO; and / or P2O5; and / or Gd2O3; and / or Ta2O5.

[0012] Furthermore, the optical glass has a refractive index of 1.550–1.600, preferably 1.555–1.595, more preferably 1.560–1.590; and / or an Abbe number of 55.00–60.00; and / or a transition temperature of 485°C or higher, preferably 490°C or higher, more preferably 495°C or higher; and / or a water resistance rating of Class 3 or higher, preferably Class 2 or higher; and / or an acid resistance rating of Class 2 or higher, preferably Class 1; and / or a coefficient of thermal expansion α. 20-120℃ 60×10 -7 / ℃~100×10 -7 / ℃, preferably 65×10 -7 / ℃~95×10 -7 / ℃, more preferably 70×10 -7 / ℃~90×10 -7 / ℃; and / or Young's modulus is 85×10⁻⁶. 9 Pa or higher, preferably 87 × 10 Pa 9 Pa or higher, more preferably 89 × 10 Pa 9Pa or higher; and / or a Poisson's ratio of 0.230 to 0.250, preferably 0.232 to 0.248, more preferably 0.232 to 0.246; and / or a microkernel hardness of 55 × 10⁻⁶. 9 Pa or higher, preferably 56 × 10 Pa 9 Pa or higher, more preferably 57 × 10 Pa. 9 Pa or higher; and / or a density of 2.90 g / cm³. 3 The preferred value is 2.87 g / cm³. 3 The preferred value is 2.84 g / cm³. 3 The following are acceptable conditions: and / or the clarification temperature is 1400°C or below, preferably 1300°C or below, more preferably 1200°C or below; and / or the anti-crystallization performance is Class 3 or above, preferably Class 2 or above, more preferably Class 1.

[0013] The glass preform is made of the aforementioned optical glass.

[0014] The optical element is made of the optical glass described above, or of the glass preform described above.

[0015] An optical instrument containing the aforementioned optical glass and / or containing the aforementioned optical elements.

[0016] The beneficial effects of this invention are: through reasonable component design, the optical glass of this invention has high hardness while having the desired refractive index and Abbe number. Detailed Implementation

[0017] 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.

[0018] Optical Glass

[0019] The composition range of each component (ingredient) of the optical glass of the present invention will be described below. In the present invention, unless otherwise specified, the content of each component, the total content, and the aggregate content are all expressed as weight percentages (wt%), that is, the weight percentage of the content of each component, the total content, and the aggregate content relative to the total amount of glass material converted into oxide composition. Here, "converted into oxide composition" refers to the total amount of oxides used as raw materials for the optical glass of the present invention, where the oxides, complex salts, and hydroxides decompose and transform into oxides upon melting, and the total amount of such oxides is taken as 100%.

[0020] 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.

[0021] <Essential and Optional Components>

[0022] SiO2 is a glass network forger and an essential component of the optical glass of this invention. SiO2 can improve the glass's resistance to devitrification and thermal stability. However, if the SiO2 content in the glass is too high, the high-temperature viscosity of the glass will be too high, leading to an increase in the glass refining temperature. Therefore, the SiO2 content is 38-65%, preferably 44-61%, and more preferably 50-57%. In some embodiments, the SiO2 content can be 38%, 38.5%, 39%, 39.5%, 40%, 40.5%, 41%, 41.5%, 42%, 42.5%, 43%, 43.5%, 44%, 44.5%, 45%, 45.5%, 46%, 46.5%, 47%, 47.5%, 48%, 48.5%, 49%, 49.5%, 50%, 50.5%, 51%, 51.5%, 52%, 52.5%, 53%, 53.5%, 54%, 54.5%, 55%, 55.5%, 56%, 56.5%, 57%, 57.5%, 58%, 58.5%, 59%, 59.5%, 60%, 60.5%, 61%, 61.5%, 62%, 62.5%, 63%, 63.5%, 64%, 64.5%, 65%, etc., as well as all ranges and subranges between the above values. It should be understood that, in the implementation plan, any of the above scopes can be combined with any other scopes.

[0023] Li₂O can significantly lower the refining temperature of glass without significantly affecting its coefficient of thermal expansion, Young's modulus, and hardness. However, excessively high Li₂O content can lead to depolymerization of the glass network and a decrease in its resistance to crystallization. Therefore, the Li₂O content is 2–7%, preferably 2.5–6.5%, and more preferably 3–6%. In some embodiments, the Li₂O content can be 2%, 2.3%, 2.5%, 2.7%, 3%, 3.3%, 3.5%, 3.7%, 4%, 4.3%, 4.5%, 4.7%, 5%, 5.3%, 5.5%, 5.7%, 6%, 6.3%, 6.5%, 6.7%, 7%, etc., as well as all ranges and sub-ranges between these values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0024] Na₂O is an essential component of the optical glass of this invention. Na₂O can lower the refining temperature of the glass and increase its coefficient of thermal expansion. However, excessive Na₂O content leads to a decrease in the glass's transition temperature and a deterioration in its chemical stability. Therefore, the Na₂O content is 5–12%, preferably 6–11.5%, and more preferably 7–11%. In some embodiments, the Na₂O content can be 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, etc., as well as all ranges and sub-ranges between these values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0025] Through extensive experimental research, the inventors discovered that in some embodiments, controlling the Li₂O / (Li₂O+Na₂O) ratio within the range of 0.20 to 0.45 allows the glass to exhibit better water resistance and a lower refining temperature. Therefore, a Li₂O / (Li₂O+Na₂O) ratio of 0.20 to 0.45 is preferred, 0.25 to 0.40 is more preferred, and 0.30 to 0.36 is even more preferred. In some embodiments, Li₂O / (Li₂O+Na₂O) can be 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0026] K2O is an external component of the glass network. K2O in glass helps reduce viscosity, simplify glass refining, and increase the coefficient of thermal expansion. However, the glass of this invention has a relatively high alkali metal content; excessive K2O can lead to an excessively high alkali metal content, thereby reducing the glass's resistance to crystallization. Therefore, the K2O content is 0-2%, preferably 0-1%, and more preferably no K2O. In some embodiments, the K2O content 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%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc., as well as all ranges and sub-ranges between these values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0027] MgO is an intermediate component in glass networks. Among divalent metal oxides, MgO has a relatively strong ability to enter the glass network, which is beneficial for improving the chemical stability of the glass. Within a certain range, increasing the MgO content increases the hardness of the glass. However, excessively high MgO content will reduce the glass's resistance to crystallization and lead to a decrease in the content of other divalent metal oxides in the glass, resulting in increased viscosity and decreased refractive index. Therefore, the MgO content is 0–5%, preferably 0–4%, and more preferably 0.5–3%. In some embodiments, the MgO content 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%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.3%, 2.5%, 2.7%, 3%, 3.3%, 3.5%, 3.7%, 4%, 4.3%, 4.5%, 4.7%, 5%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0028] ZnO is an intermediate component in glass networks. Compared to other divalent metal oxides, ZnO has the highest tendency to integrate into glass networks, and its application in high-alkali silicate glass systems is beneficial for reducing the coefficient of thermal expansion of the glass. Simultaneously, ZnO also increases the refractive index of the glass. However, if the ZnO content is too high, the content of network-forming components in the glass will be insufficient, leading to a decrease in the glass's resistance to crystallization. Therefore, the ZnO content is 0–10%, preferably 0–8%, and more preferably 2–6%. In some embodiments, the ZnO content can be 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 1.3%, 1.5%, 1.7%, 2%, 2.3%, 2.5%, 2.7%, 3%, 3.3%, 3.5%, 3.7%, 4%, 4.3%, 4.5%, 4.7%, 5%, 5.3%, 5.5%, 5.7%, 6%, 6.3%, 6.5%, 6.7%, 7%, 7.3%, 7.5%, 7.7%, 8%, 8.3%, 8.5%, 8.7%, 9%, 9.3%, 9.5%, 9.7%, 10%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0029] Through extensive experimental research, the inventors discovered that in some embodiments, controlling the (MgO+ZnO) / Na2O ratio within the range of 0.20 to 1.25 is beneficial for improving the glass's resistance to crystallization, and for giving the glass a higher Young's modulus and a higher transition temperature. Therefore, a (MgO+ZnO) / Na2O ratio of 0.20 to 1.25 is preferred, a ratio of 0.30 to 1.00 is more preferred, and a ratio of 0.40 to 0.80 is even more preferred. In some implementations, (MgO+ZnO) / Na2O can be 0.20, 0.23, 0.25, 0.27, 0.30, 0.33, 0.35, 0.37, 0.40, 0.43, 0.45, 0.47, 0.50, 0.53, 0.55, 0.57, 0.60, 0.63, 0.65, 0.67, 0.70, 0.73, 0.75, 0.77, 0.80, 0.83, 0.85, 0.87, 0.90, 0.93, 0.95, 0.97, 1.00, 1.03, 1.05, 1.07, 1.10, 1.13, 1.15, 1.17, 1.20, 1.23, 1.25, etc., as well as all ranges and subranges between the above values. It should be understood that, in the implementation plan, any of the above scopes can be combined with any other scopes.

[0030] SrO is an intermediate component in the glass network. SrO has a similar effect on increasing the refractive index as ZnO, but its tendency to enter the glass network is relatively lower. Compared to BaO, the presence of SrO in glass is beneficial for improving its chemical stability. At low SrO contents, the glass's acid and water resistance cannot meet the requirements for use. Therefore, the SrO content is 1–8%, preferably 1.5–7%, and more preferably 2–6%. In some embodiments, the SrO content can be 1%, 1.3%, 1.5%, 1.7%, 2%, 2.3%, 2.5%, 2.7%, 3%, 3.3%, 3.5%, 3.7%, 4%, 4.3%, 4.5%, 4.7%, 5%, 5.3%, 5.5%, 5.7%, 6%, 6.3%, 6.5%, 6.7%, 7%, 7.3%, 7.5%, 7.7%, 8%, etc., as well as all ranges and sub-ranges between these values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0031] BaO increases the refractive index of glass, and an appropriate amount of BaO is beneficial for improving the anti-crystallization properties of the glass of this invention. Compared with MgO and SrO, BaO has a greater impact on the coefficient of thermal expansion of glass; increasing the BaO content increases the coefficient of thermal expansion. However, if the BaO content is too high, the density of the glass increases, and its acid resistance decreases. Therefore, the BaO content is 0–10%, preferably 1–9%, and more preferably 2–8%. In some embodiments, the BaO content can be 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 1.3%, 1.5%, 1.7%, 2%, 2.3%, 2.5%, 2.7%, 3%, 3.3%, 3.5%, 3.7%, 4%, 4.3%, 4.5%, 4.7%, 5%, 5.3%, 5.5%, 5.7%, 6%, 6.3%, 6.5%, 6.7%, 7%, 7.3%, 7.5%, 7.7%, 8%, 8.3%, 8.5%, 8.7%, 9%, 9.3%, 9.5%, 9.7%, 10%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0032] B2O3 is a glass network forging component. In the silicate glass system of the glass of the present invention, the content of B2O3 can be adjusted within a wide range without affecting the good anti-crystallization properties of the glass of the present invention. However, excessively high B2O3 content is detrimental to the glass obtaining good chemical stability. Therefore, the content of B2O3 is 2-12%, preferably 3-11%, and more preferably 4-10%. In some embodiments, the content of B2O3 can be 2%, 2.3%, 2.5%, 2.7%, 3%, 3.3%, 3.5%, 3.7%, 4%, 4.3%, 4.5%, 4.7%, 5%, 5.3%, 5.5%, 5.7%, 6%, 6.3%, 6.5%, 6.7%, 7%, 7.3%, 7.5%, 7.7%, 8%, 8.3%, 8.5%, 8.7%, 9%, 9.3%, 9.5%, 9.7%, 10%, 10.3%, 10.5%, 10.7%, 11%, 11.3%, 11.5%, 11.7%, 12%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0033] Through extensive experimental research, the inventors discovered that, in some embodiments, controlling the (SrO+BaO) / B2O3 ratio within the range of 0.75 to 2.70 can improve the chemical stability and hardness of the glass. Therefore, a (SrO+BaO) / B2O3 ratio of 0.75 to 2.70 is preferred, a (SrO+BaO) / B2O3 ratio of 0.90 to 2.00 is more preferred, and a (SrO+BaO) / B2O3 ratio of 1.00 to 1.50 is even more preferred. In some implementations, (SrO+BaO) / B2O3 can be 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 1.05, 1.10, 1.15, 1.20, 1.25, 1.30, 1.35, 1.40, 1.45, 1.50, 1.55, 1.60, 1.65, 1.70, 1.75, 1.80, 1.85, 1.90, 1.95, 2.00, 2.05, 2.10, 2.15, 2.20, 2.25, 2.30, 2.35, 2.40, 2.45, 2.50, 5.55, 2.60, 2.65, 2.70, etc., as well as all ranges and subranges between the above values. It should be understood that, in the implementation plan, any of the above scopes can be combined with any other scopes.

[0034] Al2O3 is a glass network forging component that can improve the chemical stability, mechanical strength, and weather resistance of glass. In the high-alkali silicate glass system of this invention, an appropriate amount of Al2O3 does not affect the melting of the glass batch, the rising and removal of bubbles in the molten glass, or lead to a decrease in the glass's resistance to crystallization. However, excessive Al2O3 content can easily lead to a decrease in the glass's devitrification resistance. Therefore, the Al2O3 content is 0-10%, preferably 0-5%, and more preferably no Al2O3. In some embodiments, the Al2O3 content can be 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 1.3%, 1.5%, 1.7%, 2%, 2.3%, 2.5%, 2.7%, 3%, 3.3%, 3.5%, 3.7%, 4%, 4.3%, 4.5%, 4.7%, 5%, 5.3%, 5.5%, 5.7%, 6%, 6.3%, 6.5%, 6.7%, 7%, 7.3%, 7.5%, 7.7%, 8%, 8.3%, 8.5%, 8.7%, 9%, 9.3%, 9.5%, 9.7%, 10%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0035] GeO2 increases the refractive index of glass, and a small amount of GeO2 does not reduce the glass's resistance to crystallization. However, GeO2 is expensive, and a high content is detrimental to glass cost control. Therefore, the GeO2 content is 0-2%, preferably 0-0.5%, and more preferably no GeO2. In some embodiments, the GeO2 content 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%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0036] TiO2 improves the refractive index of glass, but excessive content can lead to poor devitrification resistance and reduced light transmittance. Therefore, the TiO2 content in the glass of this invention is 0-1%, preferably 0-0.5%, and more preferably no TiO2. In some embodiments, the TiO2 content 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%, etc., as well as all ranges and sub-ranges between these values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0037] ZrO2 is an intermediate component in the glass network. In the high-alkali silicate glass system of this invention, ZrO2 generally exists in the form of [ZrO6]. The presence of ZrO2 in the glass is beneficial for increasing the glass's refractive index, water resistance, acid resistance, and weather resistance. Within a certain range, increasing the ZrO2 content is beneficial for improving the glass's hardness. However, ZrO2 is a refractory component. If the ZrO2 content is too high, the melting process of the glass batch will be slow, requiring a longer melting time. This leads to more severe volatilization of alkali metals during glass manufacturing, which is detrimental to maintaining the consistency of the composition of different batches of glass. Therefore, the ZrO2 content is 2-10%, preferably 3-9%, and more preferably 4-8%. In some embodiments, the ZrO2 content can be 2%, 2.3%, 2.5%, 2.7%, 3%, 3.3%, 3.5%, 3.7%, 4%, 4.3%, 4.5%, 4.7%, 5%, 5.3%, 5.5%, 5.7%, 6%, 6.3%, 6.5%, 6.7%, 7%, 7.3%, 7.5%, 7.7%, 8%, 8.3%, 8.5%, 8.7%, 9%, 9.3%, 9.5%, 9.7%, 10%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0038] Through extensive experimental research, the inventors discovered that in some embodiments, controlling the Li₂O / ZrO₂ ratio within the range of 0.50 to 1.75 is beneficial for improving the glass's production performance and giving it better resistance to crystallization, lower high-temperature viscosity, and higher Young's modulus. Therefore, a Li₂O / ZrO₂ ratio of 0.50 to 1.75 is preferred, 0.60 to 1.20 is more preferred, and 0.70 to 0.90 is even more preferred. In some implementations, the Li₂O / ZrO₂ content can be 0.50, 0.53, 0.55, 0.57, 0.60, 0.63, 0.65, 0.67, 0.70, 0.73, 0.75, 0.77, 0.80, 0.83, 0.85, 0.87, 0.90, 0.93, 0.95, 0.97, 1.00, 1.03, 1.05, 1.07, 1.10, 1... 1.13, 1.15, 1.17, 1.20, 1.23, 1.25, 1.27, 1.30, 1.33, 1.35, 1.37, 1.40, 1.43, 1.45, 1.47, 1.50, 1.53, 1.55, 1.57, 1.60, 1.63, 1.65, 1.67, 1.70, 1.73, 1.75, etc., as well as all ranges and subranges between the above values. It should be understood that, in the implementation scheme, any of the above ranges can be combined with any other range.

[0039] Increasing the ZnO and B2O3 content in glass leads to a decrease in the solubility of ZrO2, making it difficult to improve the intrinsic quality of continuously produced glass and increasing its tendency to crystallize. However, if the ZnO and B2O3 content in glass is too low, the refining temperature of the glass increases. Through extensive experimental research, the inventors discovered that by controlling the (ZnO+B2O3) / ZrO2 ratio within the range of 1.33 to 4.00, the glass can simultaneously possess a lower refining temperature and better anti-crystallization properties. Therefore, a (ZnO+B2O3) / ZrO2 ratio of 1.33 to 4.00 is preferred, a ratio of 1.66 to 3.50 is more preferred, and a ratio of 2.00 to 3.00 is even more preferred. In some implementations, the ratio of (ZnO+B2O3) / ZrO2 can be 1.33, 1.35, 1.37, 1.40, 1.43, 1.45, 1.47, 1.50, 1.53, 1.55, 1.57, 1.60, 1.63, 1.65, 1.67, 1.70, 1.73, 1.75, 1.80, 1.83, 1.85, 1.87, 1.90, 1.93, 1.95, 1.97, 2.00, 2.03, 2.05, 2.07, 2.10, 2.13, 2.15, 2.17, 2.20, 2.23, 2.25, 2.27, 2.30, 2.33, 2.35, 2.37, 2.40, 2.43, 2.45, 2.47, 2.50, 2.53, 2.55, 2.57, 2.60, 2.6 3, 2.65, 2.67, 2.70, 2.73, 2.75, 2.80, 2.83, 2.85, 2.87, 2.90, 2.93, 2.95, 2.97, 3.00, 3.03, 3.05, 3.07, 3.10, 3.13, 3.15, 3.17, 3.20, 3.23, 3.25, 3.27, 3.30, 3.33, 3.35, 3 3.37, 3.40, 3.43, 3.45, 3.47, 3.50, 3.53, 3.55, 3.57, 3.60, 3.63, 3.65, 3.67, 3.70, 3.73, 3.75, 3.80, 3.83, 3.85, 3.87, 3.90, 3.93, 3.95, 3.97, 4.00, etc., as well as all ranges and subranges between the above values. It should be understood that, in the implementation scheme, any of the above ranges can be combined with any other range.

[0040] La2O3 is beneficial for increasing the refractive index of glass, but in high-alkali glass, a high content of La2O3 significantly reduces the glass's resistance to crystallization. Therefore, the La2O3 content is 0-4%, preferably 0-1%, and more preferably no La2O3. In some embodiments, the La2O3 content can be 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 1.3%, 1.5%, 1.7%, 2%, 2.3%, 2.5%, 2.7%, 3%, 3.3%, 3.5%, 3.7%, 4%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0041] Y₂O₃ is beneficial for increasing the refractive index of glass, and a small amount of Y₂O₃ is beneficial for increasing the glass transition temperature. In high-alkali glass, a high content of Y₂O₃ significantly reduces the glass's resistance to crystallization. With the same content, the decrease in glass resistance to crystallization caused by the presence of Y₂O₃ is less than that caused by La₂O₃. Therefore, the Y₂O₃ content is 0–6%, preferably 0–1.5%, and more preferably no Y₂O₃. In some embodiments, the Y₂O₃ content can be 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 1.3%, 1.5%, 1.7%, 2%, 2.3%, 2.5%, 2.7%, 3%, 3.3%, 3.5%, 3.7%, 4%, 4.3%, 4.5%, 4.7%, 5%, 5.3%, 5.5%, 5.7%, 6%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in the implementation plan, any of the above scopes can be combined with any other scopes.

[0042] Nb₂O₅ has the effect of increasing the refractive index of glass. A small amount of Nb₂O₅ can significantly increase the refractive index of the glass of the present invention; however, excessive Nb₂O₅ content leads to a decrease in the glass's resistance to crystallization. Therefore, the Nb₂O₅ content is 0-2%, preferably 0-1%, and more preferably no Nb₂O₅. In some embodiments, the Nb₂O₅ content 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%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0043] Sb₂O₃ and SnO₂ act as clarifying agents in glass. In the glass of this invention, selecting Sb₂O₃ or SnO₂, or using both in combination, are both clarifying agent choices that achieve good clarification effects. The higher the content of Sb₂O₃ and SnO₂, the better the clarification effect of the glass. However, if the content of Sb₂O₃ and SnO₂ is further increased, the clarification effect of the glass reaches a certain level and then stops improving, while the glass becomes more corrosive to platinum devices during production. Within a certain range, the content of Sb₂O₃ and SnO₂ can achieve the usable properties of the glass of this invention. Therefore, the Sb₂O₃ content of the glass is 0-0.6%, preferably 0-0.4%, more preferably 0.1-0.3%; the SnO₂ content of the glass is 0-1%, preferably 0-0.8%, more preferably 0-0.6%. The glass of this invention preferably contains one of Sb₂O₃ and SnO₂ as a clarifying agent. In some embodiments, the Sb₂O₃ content can be 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range. In some embodiments, the SnO₂ content 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%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0044] <Components that should not be present>

[0045] CeO2 can also be used as a clarifier for glass, but it can cause severe coloration and is a valuable raw material. Therefore, the glass of this invention preferably does not contain CeO2.

[0046] CaO is an intermediate component in glass networks. The presence of CaO in glass is detrimental to maintaining the glass's high transition temperature, high hardness, and low density while simultaneously ensuring the refractive index and Abbe number meet target ranges. Therefore, the glass of this invention preferably does not contain CaO.

[0047] P2O5 reduces the chemical stability of the glass of the present invention and significantly reduces its resistance to crystallization. Therefore, the glass of the present invention preferably does not contain P2O5.

[0048] Gd₂O₃ is an optional component of the glass of this invention. The effect of Gd₂O₃ on glass properties is similar to that of La₂O₃ and Y₂O₃, but Gd₂O₃ also has the disadvantage of being expensive and a precious component. Therefore, the glass of this invention preferably does not contain Gd₂O₃.

[0049] Ta₂O₅ can increase the refractive index of glass. However, Ta₂O₅ is a valuable raw material. Therefore, the glass of this invention preferably does not contain Ta₂O₅.

[0050] Rb₂O, Cs₂O, RuO₂, RhO₂, HfO₂, Sc₂O₃, Yb₂O₃, Ga₂O₃, and In₂O₃ are valuable raw material components, and their presence is foreseeable as not significantly improving the performance of the glass of the present invention. Therefore, the glass of the present invention preferably does not contain Rb₂O, and / or does not contain Cs₂O, and / or does not contain RuO₂, and / or does not contain RhO₂, and / or does not contain HfO₂, and / or does not contain Sc₂O₃, and / or does not contain Yb₂O₃, and / or does not contain Ga₂O₃, and / or does not contain In₂O₃.

[0051] PbO, As₂O₃, Tl₂O, HgO, and CdO are components harmful to human health and the environment. Avoiding the use of these components can reduce environmental pollution during their mining and smelting processes. Therefore, the glass of this invention preferably does not contain PbO, and / or does not contain As₂O₃, and / or does not contain Tl₂O, and / or does not contain HgO, and / or does not contain CdO.

[0052] WO3, V2O5, Cr2O3, MnO2, Fe2O3, CoO, NiO, CuO, Pr2O3, Nd2O3, Pm2O3, Sm2O3, Eu2O3, Tb4O7, Dy2O3, Ho2O3, Er2O3, Tm2O3, and Lu2O3 are components that cause glass coloring. Therefore, the glass of the present invention preferably does not contain WO3, and / or does not contain V2O5, and / or does not contain Cr2O3, and / or does not contain MnO2, and / or does not contain... Contains Fe2O3, and / or does not contain CoO, and / or does not contain NiO, and / or does not contain CuO, and / or does not contain Pr2O3, and / or does not contain Nd2O3, and / or does not contain Pm2O3, and / or does not contain Sm2O3, and / or does not contain Eu2O3, and / or does not contain Tb4O7, and / or does not contain Dy2O3, and / or does not contain Ho2O3, and / or does not contain Er2O3, and / or does not contain Tm2O3, and / or does not contain Lu2O3.

[0053] 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 used in the production of optical glass, there may be some unintentionally added impurities or components that are present in small or trace amounts in the final optical glass. Such cases are also within the scope of protection of this patent.

[0054] The performance of the optical glass of the present invention will now be described.

[0055] <Refractive index and Abbe number>

[0056] The refractive index (n) of optical glass d ) and Abbe number (ν d Test according to the method specified in standard GB / T 7962.1—2010. d n F n C These are the refractive indices of the glass corresponding to wavelengths of 587.6 nm, 480.0 nm, and 656.3 nm, respectively.

[0057] Abbe number (ν) d Defined by the following formula:

[0058]

[0059] In some embodiments, the refractive index (n) of the optical glass of the present invention is... d The refractive index is 1.550 to 1.600, preferably 1.555 to 1.595, and more preferably 1.560 to 1.590. In some embodiments, the refractive index of the optical glass can be 1.550, 1.555, 1.560, 1.565, 1.570, 1.575, 1.580, 1.585, 1.590, 1.595, 1.600, etc., as well as all ranges and subranges between the above values.

[0060] In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The Abbe number is 55.00 to 60.00. In some embodiments, the Abbe number of the optical glass can be 55.00, 55.50, 56.00, 56.50, 57.00, 57.50, 58.00, 58.50, 59.00, 59.50, 60.00, etc., as well as all ranges and subranges between the above values.

[0061] <Transition Temperature>

[0062] Transition temperature (T) of optical glass g Test according to the method specified in standard GB / T 7962.16—2010.

[0063] In some embodiments, the transition temperature (T) of the optical glass of the present invention is... gThe temperature transition temperature is 485°C or higher, preferably 490°C or higher, and more preferably 495°C or higher. In some embodiments, the transition temperature of the optical glass of the present invention can be 485°C, 490°C, 495°C, 500°C, 505°C, 510°C, 515°C, 520°C, 525°C, 530°C, 535°C, 540°C, 545°C, 550°C, etc., as well as all ranges and sub-ranges between the above values.

[0064] <Water Resistance Stability>

[0065] The water resistance stability (R) of glass was tested according to the method described in standard GB / T 17129. W That is, the percentage of leaching of glass with a certain particle size and mass under the action of a specific water environment is tested, and the water resistance stability of the glass is divided into 6 categories according to Table 1 below.

[0066] Table 1.

[0067]

[0068] In some embodiments, the water resistance (R) of the optical glass of the present invention is... W It should be of 3 or more categories, preferably 2 or more categories.

[0069] <Acid resistance>

[0070] The acid resistance stability (R) of optical glass was tested according to the method described in standard GB / T 17129. A That is, the percentage of leaching of glass with a certain particle size and mass under the action of a specific acid environment is tested, and the acid resistance stability of the glass is divided into 6 categories according to Table 2 below.

[0071] Table 2.

[0072]

[0073] In some embodiments, the acid resistance (R) of the optical glass of the present invention is... A There are two or more categories, with category 1 being preferred.

[0074] Coefficient of thermal expansion

[0075] The coefficient of thermal expansion of optical glass was tested according to the method specified in standard GB / T 7962.16—2010. The coefficient of thermal expansion of optical glass described in this specification is the average coefficient of thermal expansion (α) of the glass in the range of 20–120℃. 20-120℃ ).

[0076] The glass of this invention has a moderate coefficient of thermal expansion, which is beneficial for compatibility with common sealing materials and optical glass for tubes. In some embodiments, the coefficient of thermal expansion of the optical glass of this invention (α) is...20-120℃ ) is 60×10 -7 / ℃~100×10 -7 / ℃, preferably 65×10 -7 / ℃~95×10 -7 / ℃, more preferably 70×10 -7 / ℃~90×10 -7 / ℃. In some embodiments, the coefficient of thermal expansion (α) of the optical glass of the present invention is... 20-120℃ ) is 60×10 -7 / ℃, 63×10 -7 / ℃, 65×10 -7 / ℃, 67×10 -7 / ℃, 70×10 -7 / ℃, 73×10 -7 / ℃, 75×10 -7 / ℃, 77×10 -7 / ℃, 80×10 -7 / ℃, 83×10 -7 / ℃, 85×10 -7 / ℃, 87×10 -7 / ℃, 90×10 -7 / ℃, 93×10 -7 / ℃, 95×10 -7 / ℃, 97×10 -7 / ℃, 100×10 -7 / ℃, etc., and all ranges and subranges between the above values.

[0077] Young's Modulus

[0078] The Young's modulus (E) of optical glass was tested according to the method described in standard GB / T 7962.6—2010.

[0079] In some embodiments, the Young's modulus (E) of the optical glass of the present invention is 85 × 10⁻⁶. 9 Pa or higher, preferably 87 × 10 Pa 9 Pa or higher, more preferably 89 × 10 Pa 9 Pa or higher. In some embodiments, the Young's modulus of the optical glass of the present invention is 85 × 10⁻⁶. 9 Pa, 85.5 × 10 9 Pa, 86×10 9 Pa, 86.5 × 10 9 Pa, 87×10 9 Pa, 87.5 × 10 9 Pa, 88×10 9 Pa, 88.5×10 9 Pa, 89×109 Pa, 89.5 × 10 9 Pa, 90×10 9 Pa, 90.5 × 10 9 Pa, 91×10 9 Pa, 91.5 × 10 9 Pa, 92×10 9 Pa, etc., and all ranges and subranges between the above values.

[0080] Poisson's ratio

[0081] The Poisson's ratio of the glass was tested according to the method described in the standard GB / T 7962.6—2010.

[0082] The optical glass of the present invention has a relatively suitable Poisson's ratio. In some embodiments, the Poisson's ratio of the optical glass of the present invention is 0.230 to 0.250, preferably 0.232 to 0.248, and more preferably 0.232 to 0.246. In some embodiments, the Poisson's ratio of the optical glass of the present invention can be 0.230, 0.231, 0.232, 0.233, 0.234, 0.235, 0.236, 0.237, 0.238, 0.239, 0.240, 0.241, 0.242, 0.243, 0.244, 0.245, 0.246, 0.247, 0.248, 0.249, 0.250, etc., as well as all ranges and subranges between the above values.

[0083] <Micro Kelvin Hardness>

[0084] Optical glass was processed into 40×30×10mm samples with two polished surfaces. The samples were held at a temperature 25°C below their transformation temperature for 50 hours, then cooled at a rate of -2°C / hour for 100 hours, and finally allowed to cool naturally to room temperature. The micro-Kirch hardness (referred to as hardness in this invention) of the glass was tested using a microhardness tester and a standard Kirchhoff hardness indenter, specifically a pyramidal diamond indenter with an α angle of 172.5° and a β angle of 130° between its two top edges. The force was applied for 10 seconds, and the corresponding weight was 200g. The micro-Kirch hardness (H) of the glass was calculated using the following formula. K ):

[0085]

[0086] Where F is the magnitude of the test force and d is the length of the diagonal of the indentation.

[0087] In some embodiments, the microkeratology of the optical glass of the present invention is 55 × 10⁻⁶. 9 Pa or higher, preferably 56 × 10 Pa 9Pa or higher, more preferably 57 × 10 Pa. 9 Pa or higher. In some embodiments, the microkeratological hardness of the optical glass of the present invention is 55 × 10⁻⁶ Pa. 9 Pa, 55.3 × 10 9 Pa, 55.5 × 10 9 Pa, 55.7 × 10 9 Pa, 56×10 9 Pa, 56.3 × 10 9 Pa, 56.5 × 10 9 Pa, 56.7 × 10 9 Pa, 57×10 9 Pa, 57.3 × 10 9 Pa, 57.5 × 10 9 Pa, 57.7 × 10 9 Pa, 58×10 9 Pa, etc., and all ranges and subranges between the above values.

[0088] <Density>

[0089] The density of optical glass was tested according to the method specified in the standard GB / T7962.20—2010.

[0090] In some embodiments, the density (ρ) of the optical glass of the present invention is 2.90 g / cm³. 3 The preferred value is 2.87 g / cm³. 3 The preferred value is 2.84 g / cm³. 3 In some embodiments, the density of the optical glass of the present invention can be 2.75 g / cm³. 3 2.76 g / cm 3 2.77 g / cm 3 2.78g / cm 3 2.79 g / cm 3 2.80g / cm 3 2.81 g / cm 3 2.82 g / cm 3 2.83 g / cm 3 2.84 g / cm 3 2.85g / cm 3 2.86 g / cm 3 2.87 g / cm 3 2.88g / cm 3 2.89 g / cm 3 2.90g / cm 3 And so on, as well as all ranges and subranges between the above values.

[0091] <Clarification Temperature>

[0092] In this invention, the temperature corresponding to a glass viscosity of 100 poise is defined as the glass refining temperature. A lower glass refining temperature is beneficial for reducing energy consumption during glass production, minimizing refractory waste and dust generated from the volatilization of glass components, and extending the lifespan of platinum equipment on the production line, thus possessing greater economic and social value. The high-temperature viscosity curve of the glass is tested using the rotor viscometer method described in the standard ASTM C965-1996R2017. The optical glass of this invention, in addition to possessing good Young's modulus and chemical stability, also exhibits a relatively low refining temperature.

[0093] In some embodiments, the refining temperature (T) of the optical glass of the present invention f The refining temperature is below 1400℃, preferably below 1300℃, and more preferably below 1200℃. In some embodiments, the refining temperature of the optical glass of the present invention can be 1100℃, 1110℃, 1120℃, 1130℃, 1140℃, 1150℃, 1160℃, 1170℃, 1180℃, 1190℃, 1200℃, 1210℃, 1220℃, 1230℃, 1240℃, 1250℃, 1260℃, 1270℃, 1280℃, 1290℃, 1300℃, 1310℃, 1320℃, 1330℃, 1340℃, 1350℃, 1360℃, 1370℃, 1380℃, 1390℃, 1400℃, etc., as well as all ranges and sub-ranges between the above values.

[0094] Anti-crystallization properties

[0095] The optical glass of this invention was cut into glass blocks of 20×20×10 mm in size, washed with deionized water, and then placed in a test furnace at 900°C for a specific time before being removed and its surface and internal condition observed. The anti-crystallization performance of the glass was rated using the method described in Table 3.

[0096] Table 3.

[0097]

[0098] In some embodiments, the optical glass of the present invention has an anti-crystallization performance of Class 3 or more, preferably Class 2 or more, and more preferably Class 1. The optical glass of the present invention has good anti-crystallization performance.

[0099] [Manufacturing methods for optical glass]

[0100] The optical glass described in this invention can be prepared using a conventional melting method. Specifically, oxides, hydroxides, fluorides, hydrates, various salts (carbonates, nitrates, sulfates, phosphates, metaphosphates, etc.), boric acid, etc., are used as raw materials. These are thoroughly mixed according to a predetermined ratio of glass components and then placed into a chamber constructed of platinum or refractory material at a set temperature. After a certain period of stirring, bubbling, and settling, the raw materials undergo a solid-state reaction, melting, and homogenization process to form a homogeneous glass melt. The manufacturing temperature of the glass of this invention is within the conventional glass furnace temperature range. Those skilled in the art can determine the temperatures for the raw material melting and homogenization stages of the glass within the range of 1300–1550°C based on actual conditions. Those skilled in the art can appropriately select raw materials, process methods, and process parameters according to actual needs.

[0101] [Glass preforms and optical components]

[0102] Glass preforms can be manufactured from the optical glass using methods such as grinding, hot pressing, or precision stamping. Specifically, glass preforms can be manufactured by machining the optical glass, such as grinding and polishing; or by hot pressing a preform made from the optical glass for molding and then grinding it; or by precision stamping a preform made from the ground glass.

[0103] It should be noted that the means of preparing the glass preform are not limited to those described above. As mentioned above, the optical glass of the present invention is useful for various optical elements and optical designs, and it is particularly preferred to form a preform from the optical glass of the present invention, using the preform for hot pressing, precision stamping, etc., to manufacture optical elements such as lenses, prisms, and diffraction gratings.

[0104] 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, prisms, and diffraction gratings with high optical value.

[0105] 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.

[0106] [Optical Instruments]

[0107] The optical elements formed by the optical glass of this invention can be used to manufacture optical instruments such as photographic equipment, portable electronic devices (such as mobile phones, watches, etc.), video cameras, display devices, and monitoring equipment.

[0108] [Example]

[0109] <Example of Optical Glass>

[0110] To further illustrate and explain the technical solution of the present invention, the following non-limiting embodiments are provided.

[0111] In this embodiment, optical glass with the composition shown in Tables 4 to 8 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 4 to 8.

[0112] Table 4.

[0113]

[0114] Table 5.

[0115]

[0116] Table 6.

[0117]

[0118] Table 7.

[0119]

[0120] Table 8.

[0121]

[0122] <Example of Glass Prefabricated Components>

[0123] The glass obtained in the optical glass examples in Tables 4 to 8 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.

[0124] <Optical Component Examples>

[0125] Annealing these preforms obtained from the above glass preform examples reduces internal stress in the glass while fine-tuning the refractive index, so that optical properties such as the refractive index reach the desired values.

[0126] 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.

[0127] <Examples of Optical Instruments>

[0128] The optical elements obtained from the above-described optical element embodiments can be used, through optical design, to form optical components or optical assemblies by using one or more optical elements. These components can be used in, for example, imaging devices, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / lighting in the automotive field, lithography technology, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices that include such circuits and chips.

Claims

1. Optical glass, characterized in that, Its composition, expressed as a weight percentage, contains: SiO2: 38–65%; Li2O: 2–7%; Na2O: 5–12%; SrO: 1–8%; BaO: 0–10%; B2O3: 2–12%; ZrO2: 2–10%, of which (SrO+BaO) / B2O3 is 0.75–2.

70.

2. The optical glass according to claim 1, characterized in that, Its components, expressed as a weight percentage, also include: K2O: 0–2%; and / or MgO: 0–5%; and / or ZnO: 0–10%; and / or Al2O3: 0–10%; and / or GeO2: 0–2%; and / or TiO2: 0–1%; and / or La2O3: 0–4%; and / or Y2O3: 0–6%; and / or Nb2O5: 0–2%; and / or Sb2O3: 0–0.6%; and / or SnO2: 0–1%.

3. Optical glass, characterized in that, Its composition includes SiO2, Li2O, Na2O, SrO, B2O3, and ZrO2. The composition, expressed as a weight percentage, contains 0–10% BaO, with the (SrO+BaO) / B2O3 ratio ranging from 0.75 to 2.

70. The optical glass has a refractive index of 1.550–1.600, an Abbe number of 55.00–60.00, and a microkernel hardness of 55 × 10⁻⁶. 9 Pa or above.

4. The optical glass according to claim 3, characterized in that, Its composition, expressed as a weight percentage, contains: SiO2: 38–65%; and / or Li2O: 2–7%; and / or Na2O: 5–12%; and / or SrO: 1–8%; and / or B2O3: 2–12%; and / or ZrO2: 2–10%; and / or K2O: 0–2%; and / or MgO: 0–5%; and / or ZnO: 0–10%; and / or Al2O3: 0–10%; and / or GeO2: 0–2%; and / or TiO2: 0–1%; and / or La2O3: 0–4%; and / or Y2O3: 0–6%; and / or Nb2O5: 0–2%; and / or Sb2O3: 0–0.6%; and / or SnO2: 0–1%.

5. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: Li₂O / (Li₂O+Na₂O) is 0.20–0.45, preferably 0.25–0.40, more preferably 0.30–0.36; and / or (MgO+ZnO) / Na₂O is 0.20–1.25, preferably 0.30–1.00, more preferably 0.40–0.80; and / or (SrO+BaO) The ratio of (SrO+BaO) / B2O3 is 0.90 to 2.00, preferably 1.00 to 1.50; and / or the ratio of Li2O / ZrO2 is 0.50 to 1.75, preferably 0.60 to 1.20, more preferably 0.70 to 0.90; and / or the ratio of (ZnO+B2O3) / ZrO2 is 1.33 to 4.00, preferably 1.66 to 3.50, more preferably 2.00 to 3.

00.

6. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: SiO2: 44-61%, preferably SiO2: 50-57%; and / or Li2O: 2.5-6.5%, preferably Li2O: 3-6%; and / or Na2O: 6-11.5%, preferably Na2O: 7-11%; and / or SrO: 1.5-7%, preferably SrO: 2-6%; and / or BaO: 1-9%, preferably BaO: 2-8%; and / or B2O3: 3-11%, preferably B2O3: 4-10%; and / or ZrO2: 3-9%, preferably ZrO2: 4-8%; and / or K2 O: 0–1%; and / or MgO: 0–4%, preferably MgO: 0.5–3%; and / or ZnO: 0–8%, preferably ZnO: 2–6%; and / or Al2O3: 0–5%; and / or GeO2: 0–0.5%; and / or TiO2: 0–0.5%; and / or La2O3: 0–1%; and / or Y2O3: 0–1.5%; and / or Nb2O5: 0–1%; and / or Sb2O3: 0–0.4%, preferably Sb2O3: 0.1–0.3%; and / or SnO2: 0–0.8%, preferably SnO2: 0–0.6%.

7. The optical glass according to any one of claims 1 to 4, characterized in that, Its components do not contain K2O; and / or do not contain Al2O3; and / or do not contain GeO2; and / or do not contain TiO2; and / or do not contain La2O3; and / or do not contain Y2O3; and / or do not contain Nb2O5; and / or do not contain CeO2; and / or do not contain CaO; and / or do not contain P2O5; and / or do not contain Gd2O3; and / or do not contain Ta2O5.

8. The optical glass according to any one of claims 1 to 4, characterized in that, The optical glass has a refractive index of 1.550–1.600, preferably 1.555–1.595, more preferably 1.560–1.590; and / or an Abbe number of 55.00–60.00; and / or a transition temperature of 485°C or higher, preferably 490°C or higher, more preferably 495°C or higher; and / or a water resistance of Class 3 or higher, preferably Class 2 or higher; and / or an acid resistance of Class 2 or higher, preferably Class 1; and / or a coefficient of thermal expansion α. 20-120℃ 60×10 -7 / ℃~100×10 -7 / ℃, preferably 65×10 -7 / ℃~95×10 -7 / ℃, more preferably 70×10 -7 / ℃~90×10 -7 / ℃; and / or Young's modulus is 85×10⁻⁶. 9 Pa or higher, preferably 87 × 10 Pa 9 Pa or higher, more preferably 89 × 10 Pa 9 Pa or higher; and / or a Poisson's ratio of 0.230 to 0.250, preferably 0.232 to 0.248, more preferably 0.232 to 0.246; and / or a microkernel hardness of 55 × 10⁻⁶. 9 Pa or higher, preferably 56 × 10 Pa 9 Pa or higher, more preferably 57 × 10 Pa. 9 Pa or higher; and / or a density of 2.90 g / cm³. 3 The preferred value is 2.87 g / cm³. 3 The preferred value is 2.84 g / cm³. 3 The following are acceptable conditions: and / or the clarification temperature is 1400°C or below, preferably 1300°C or below, more preferably 1200°C or below; and / or the anti-crystallization performance is Class 3 or above, preferably Class 2 or above, more preferably Class 1.

9. A glass precast component, characterized in that, It is made of the optical glass described in any one of claims 1 to 8.

10. An optical element, characterized in that, It is made of the optical glass described in any one of claims 1 to 8, or of the glass preform described in claim 9.

11. An optical instrument, characterized in that, It contains the optical glass according to any one of claims 1 to 8, and / or contains the optical element according to claim 10.

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