Optical glass, glass preform, optical element and optical element

Abstract

The present application provides an optical glass, a glass preform, an optical element and an optical instrument. The optical glass comprises, in terms of percentage by weight, B2O3: 13-23%; SiO2: 1-9%; La2O3: 26-37%; Y2O3: 4-14%; ZrO2: more than 0 but less than or equal to 9%; ZnO: 16-26%; Nb2O5: 1-9%; WO3: 1-9%, wherein La2O3 / (WO3+Nb2O5) is 2.0-5.5. Through reasonable component design, the optical glass of the present application has a desired refractive index and Abbe number, and also has a low density, which is beneficial to realize miniaturization and light weight of the optical instrument.

Description

Technical Field

[0001] This invention relates to the field of glass technology, and in particular to optical glass, glass preforms, optical elements, and optical instruments. Background Technology

[0002] In recent years, with the rapid development of optoelectronic information, digital display, surveillance and security, and automotive imaging, there has been a growing demand for miniaturization, lightweighting, and high performance of optical components used in optical instruments. For the same radius of curvature, glass with a higher refractive index yields a larger imaging field of view, which is beneficial for reducing the number of optical components in optical instruments. With the trend towards miniaturization in optical instruments, the demand for high-refractive-index glass is becoming increasingly apparent. Therefore, optical glass with a refractive index of 1.785–1.835 and an Abbe number of 38–44 has promising application prospects. In terms of achieving lightweighting of optical instruments, in addition to reducing the number of optical components, reducing the density of the optical glass itself is also an important solution. Patent document CN117658446A discloses a high-refractive-index, low-dispersion optical glass with a refractive index of 1.78–1.86 and an Abbe number of 42–50. Although it has a high refractive index, its high density is not conducive to achieving further lightweighting requirements for 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 1.785 to 1.835, an Abbe number of 38 to 44, and a low density, as well as glass preforms, optical elements and optical instruments made therefrom.

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

[0005] The first aspect of this application provides an optical glass whose composition, expressed as a weight percentage, contains: B2O3: 13-23%; SiO2: 1%-9%; La2O3: 26%-37%; Y2O3: 4%-14%; ZrO2: greater than 0% but less than or equal to 9%; ZnO: 16%-26%; Nb2O5: 1%-9%; WO3: 1%-9%, wherein the ratio of La2O3 / (WO3+Nb2O5) is 2.0-5.5.

[0006] In some embodiments, the optical glass, expressed as a weight percentage, further contains: TiO2: 0–4%; and / or Li2O: 0–5%; and / or Gd2O3: 0–4%; and / or Yb2O3: 0–5%; and / or Na2O: 0–3%; and / or K2O: 0–3%; and / or Al2O3: 0–3%; and / or Ta2O5: 0–3%; and / or RO: 0–3%; and / or GeO2: 0–3%; and / or P2O5: 0–3%; and / or clarifying agent: 0–1%, wherein the RO is one or more of MgO, CaO, SrO, and BaO, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0007] This application also provides an optical glass containing B2O3, SiO2, La2O3, Y2O3, ZrO2, ZnO, Nb2O5, and WO3, expressed as a weight percentage, wherein the ratio of La2O3 / (WO3+Nb2O5) is 2.0–5.5, the refractive index of the optical glass is 1.785–1.835, the Abbe number is 38–44, and the density is 4.80 g / cm³. 3 the following.

[0008] In some embodiments, the optical glass contains, by weight percentage: B2O3: 13%–23%; and / or SiO2: 1%–9%; and / or La2O3: 26%–37%; and / or Y2O3: 4%–14%; and / or ZrO2: greater than 0% but less than or equal to 9%; and / or ZnO: 16%–26%; and / or Nb2O5: 1%–9%; and / or WO3: 1%–9%; and / or TiO2: 0%–4%; and / or Li2O: 0%–5%; and / or Or Gd2O3: 0-4%; and / or Yb2O3: 0-5%; and / or Na2O: 0-3%; and / or K2O: 0-3%; and / or Al2O3: 0-3%; and / or Ta2O5: 0-3%; and / or RO: 0-3%; and / or GeO2: 0-3%; and / or P2O5: 0-3%; and / or clarifying agent: 0-1%, wherein the RO is one or more of MgO, CaO, SrO, and BaO, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0009] In some embodiments, the optical glass, expressed as a weight percentage, satisfies one or more of the following nine conditions:

[0010] 1) The ratio of La2O3 / (WO3+Nb2O5) is 2.5 to 4.5, and the ratio of La2O3 / (WO3+Nb2O5) can be selected as 3.1 to 3.7;

[0011] 2) The ratio of (ZnO+Nb2O5) / Y2O3 is 2.0 to 4.0, and can be selected as 2.7 to 3.6, or can be selected as 3.0 to 3.4;

[0012] 3) The Y2O3 / Nb2O5 ratio is 0.8–5.0, and can be 1.0–3.0 or 1.35–2.0.

[0013] 4) The WO3 / Nb2O5 ratio is 0.2–1.1, and can be 0.4–1.0 or 0.6–0.95.

[0014] 5) The ratio of (La2O3+Y2O3) / B2O3 is 1.6 to 3.0, and (La2O3+Y2O3) / B2O3 can be 1.8 to 2.8, or (La2O3+Y2O3) / B2O3 can be 2.0 to 2.4.

[0015] 6) ZnO / B2O3 ratio is 0.8 to 1.8, ZnO / B2O3 ratio can be 1.0 to 1.6, and ZnO / B2O3 ratio can be greater than 1.0 but less than or equal to 1.4;

[0016] 7) The TiO2 / Li2O ratio is 0.1 to 2.5, and the optional TiO2 / Li2O ratio is 0.3 to 2.0, or the optional TiO2 / Li2O ratio is greater than or equal to 0.5 but less than 1.0;

[0017] 8) (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) is 4.5~8.0, (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) is 5.0~7.0, (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) is 5.5~6.8, and further (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) is 5.8~6.6;

[0018] 9. (Ta2O5+Gd2O3) / SiO2 is 1.0 or less, (Ta2O5+Gd2O3) / SiO2 can be 0.8 or less, (Ta2O5+Gd2O3) / SiO2 can be 0.5 or less, and (Ta2O5+Gd2O3) / SiO2 can be 0.2 or less.

[0019] In some embodiments, the optical glass comprises, by weight percentage, B₂O₃: 15%–21%, optionally B₂O₃: 17%–20%; and / or SiO₂: 2%–8%, optionally SiO₂: 3%–7%; and / or La₂O₃: 28%–35%, optionally La₂O₃: 30%–33%; and / or Y₂O₃: 6%–12%, optionally Y₂O₃: 7%–10%; and / or ZrO₂: 1%–7%, optionally ZrO₂: 2%–5%; and / or ZnO : 18%~24%, ZnO: 19%~22% optional; and / or Nb2O5: 2%~8%, Nb2O5: 3%~7% optional; and / or WO3: 1.5%~7%, WO3: 2%~6% optional; and / or TiO2: 0.1%~3%, TiO2: 0.5%~2.5% optional; and / or Li2O: 0.1%~4%, Li2O: 0.5%~3% optional; and / or Gd2O3: 0~2%, Gd2O3: 0~1%, optional (Gd2O3 not included); And / or Yb2O3: 0-2%, optional; Yb2O3: 0-1%, optional (excluding Yb2O3); and / or Na2O: 0-2%, optional; Na2O: 0-1%, optional (excluding Na2O); and / or K2O: 0-2%, optional; K2O: 0-1%, optional (excluding K2O); and / or Al2O3: 0-2%, optional; Al2O3: 0-1%, optional (excluding Al2O3); and / or Ta2O5: 0-2%, optional; Ta2O5: 0-1%, optional (excluding Ta2O5); And / or RO: 0-2%, optional RO: 0-1%, optional RO-free; and / or GeO2: 0-2%, optional GeO2: 0-1%, optional GeO2-free; and / or P2O5: 0-2%, optional P2O5: 0-1%, optional P2O5-free; and / or clarifying agent: 0-0.5%, optional clarifying agent: 0-0.2%, wherein the RO is one or more of MgO, CaO, SrO, and BaO, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0020] In some embodiments, the optical glass has a refractive index of 1.785–1.835, optionally 1.790–1.830, optionally 1.800–1.820, and an Abbe number of 38–44, optionally 39–43, optionally 40–42.

[0021] In some embodiments, the coefficient of thermal expansion α of the optical glass is... 100℃ / 300℃ 100×10 -7 For values ​​below / K, 95×10 can be selected. -7 For values ​​below / K, 90×10 can be selected. -7Below / K, a further option is 87×10 -7 / K or below; and / or water resistance stability of Class 2 or above, Class 1 can be selected; and / or weather resistance of Class 2 or above, Class 1 can be selected; and / or foaming degree of Grade A or above, Grade A0 or above can be selected. 00 Grade; and / or density of 4.80 g / cm³ 3 The following can be selected as 4.70 g / cm³. 3 The following can be selected as 4.60 g / cm³. 3 The following can be further selected as 4.50 g / cm³. 3 The following; and / or a transition temperature of 600°C or below, optionally 580°C or below, optionally 570°C or below, and further optionally 560°C or below; and / or a chromaticity λ 80 The maximum temperature is below 400nm, optionally below 390nm, optionally below 385nm, and further optionally below 380nm; and / or the maximum crystallization temperature is below 1080℃, optionally below 1050℃, optionally below 1000℃, and further optionally below 990℃.

[0022] The second aspect of this application provides a glass preform made of the aforementioned optical glass.

[0023] A third aspect of this application provides an optical element made of the aforementioned optical glass or a glass preform.

[0024] The fourth aspect of this application provides an optical instrument comprising the aforementioned optical glass and / or comprising the aforementioned optical elements.

[0025] The beneficial effects of this invention are: through reasonable component design, the optical glass of this invention has a lower density while having the desired refractive index and Abbe number, which is conducive to the miniaturization and weight reduction of optical instruments. Detailed Implementation

[0026] 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 may be simply referred to as glass.

[0027] Optical Glass

[0028] 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 total content are all expressed as weight percentages (wt%), that is, the weight percentage of the content of each component, the total content, 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%.

[0029] 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.

[0030] <Essential and Optional Components>

[0031] B2O3 is a component of the glass network forging system, which can improve the melt flowability and resistance to crystallization of the glass. However, if the B2O3 content is too high, the chemical stability and light transmittance of the glass decrease, and the refractive index of the glass also decreases. Therefore, in this invention, the B2O3 content is 13-23%, optionally 15-21%, or optionally 17-20%. In some embodiments, the B2O3 content can be 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%, 22%, 22.5%, 23%, 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] SiO2 can increase the viscosity of molten glass, improve its resistance to devitrification and weathering, but if its content is too high, the difficulty of melting the glass increases, the transition temperature rises, and the refractive index decreases. Therefore, the SiO2 content in this invention is 1% to 9%, optionally 2% to 8%, optionally 3% to 7%. In some embodiments, the SiO2 content can be 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 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] La2O3 is a high-refractive-index, low-dispersion component that can increase the refractive index of glass and regulate dispersion, improve the thermal and chemical stability of glass, and reduce the high-temperature viscosity of glass. However, if its content is too high, the anti-crystallization performance of glass will decrease and the transition temperature will increase. Therefore, in this invention, the content of La2O3 is 26%–37%, optionally 28%–35%, optionally 30%–33%. In some embodiments, the content of La2O3 can be 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34%, 34.5%, 35%, 35.5%, 36%, 36.5%, 37%, 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.

[0034] Y₂O₃ can improve the refractive index and anti-crystallization properties of glass, and reduce its density. However, if its content is too high, the chemical stability and weather resistance of the glass will deteriorate. Therefore, the Y₂O₃ content in this invention is 4%–14%, optionally 6%–12%, optionally 7%–10%. In some embodiments, the Y₂O₃ content can be 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 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] In some embodiments, controlling the ratio of the total content of La2O3 and Y2O3 (La2O3+Y2O3) to the content of B2O3 (La2O3+Y2O3) / B2O3 within the range of 1.6 to 3.0 can improve the glass's resistance to crystallization while simultaneously increasing its light transmittance. Therefore, a ratio of (La2O3+Y2O3) / B2O3 of 1.6 to 3.0 is optional, a ratio of (La2O3+Y2O3) / B2O3 of 1.8 to 2.8 is optional, and a ratio of (La2O3+Y2O3) / B2O3 of 2.0 to 2.4 is even more optional. In some implementations, (La2O3+Y2O3) / B2O3 can be 1.6, 1.63, 1.65, 1.67, 1.7, 1.73, 1.75, 1.77, 1.8, 1.83, 1.85, 1.87, 1.9, 1.93, 1.95, 1.97, 2.0, 2.03, 2.05, 2.07, 2.1, 2.13, 2.15, 2.17, 2.2, 2.23, 2.25, or 2. 27, 2.3, 2.33, 2.35, 2.37, 2.4, 2.43, 2.45, 2.47, 2.5, 2.53, 2.55, 2.57, 2.6, 2.63, 2.65, 2.67, 2.7, 2.73, 2.75, 2.77, 2.8, 2.83, 2.85, 2.87, 2.9, 2.93, 2.95, 2.97, 3.0, 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.

[0036] Gd₂O₃ can increase the refractive index of glass, but if its content is too high, the glass's resistance to crystallization and chemical stability will deteriorate. Therefore, the Gd₂O₃ content is 0-4%, optionally 0-2%, optionally 0-1%, and further optionally, it contains no Gd₂O₃. In some embodiments, the Gd₂O₃ 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%, 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.

[0037] Yb₂O₃ is a high-refractive-index, low-dispersion component; if its content exceeds 5%, the glass's resistance to crystallization decreases. Therefore, the Yb₂O₃ content is 0–5%, optionally 0–2%, optionally 0–1%, and further optionally, it contains no Yb₂O₃. In some embodiments, the Yb₂O₃ content can be 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%, 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.

[0038] 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, leading to inclusions and decreased light transmittance, while also reducing the glass's resistance to crystallization. Therefore, in this invention, the ZrO2 content is greater than 0% but less than or equal to 9%, optionally ranging from 0.2% to 7%, 1% to 7%, or 2% to 5%. In some embodiments, the ZrO2 content can be 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%, 8%, 8.5%, 9%, 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.

[0039] ZnO can improve the chemical stability of glass, enhance its weather resistance, and lower its glass transition temperature. However, when its content is too high, it increases the corrosion of platinum vessels during the melting process, reduces the service life of the furnace, and is detrimental to the glass's resistance to crystallization. Therefore, the ZnO content in this invention is 16%–26%, optionally 18%–24%, and optionally 19%–22%. In some embodiments, the ZnO content can be 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, 20.5%, 21%, 21.5%, 22%, 22.5%, 23%, 23.5%, 24%, 24.5%, 25%, 25.5%, 26%, 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.

[0040] In some embodiments, controlling the ratio of ZnO content to B2O3 content (ZnO / B2O3) within the range of 0.8 to 1.8 can improve both the light transmittance and weather resistance of the glass. Therefore, a ZnO / B2O3 ratio of 0.8 to 1.8 is optional, a ZnO / B2O3 ratio of 1.0 to 1.6 is optional, and a ZnO / B2O3 ratio greater than 1.0 but less than or equal to 1.4 is further optional. In some implementations, ZnO / B2O3 can be 0.8, 0.83, 0.85, 0.87, 0.9, 0.93, 0.95, 0.97, 1.0, 1.03, 1.05, 1.07, 1.1, 1.13, 1.15, 1.17, 1.2, 1.23, 1.25, 1.27, 1.3, 1.33, 1.35, 1.37, 1.4, 1.43, 1.45, 1.47, 1.5, 1.53, 1.55, 1.57, 1.6, 1.63, 1.65, 1.67, 1.7, 1.73, 1.75, 1.77, 1.8, etc., as well as all ranges and subranges between these values. It should be understood that, in implementations, any of the above ranges can be combined with any other range.

[0041] Nb₂O₅ is an essential component of the glass of this invention, playing a role in increasing the refractive index of the glass, adjusting dispersion, and improving devitrification resistance. However, if its content is too high, the light transmittance of the glass will decrease. Therefore, the content of Nb₂O₅ is 1% to 9%, optionally 2% to 8%, or optionally 3% to 7%. In some embodiments, the content of Nb₂O₅ can be 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 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.

[0042] In some embodiments, controlling the ratio of Y₂O₃ content to Nb₂O₅ content, Y₂O₃ / Nb₂O₅, within the range of 0.8 to 5.0 can reduce the glass transition temperature while simultaneously lowering the glass's coefficient of thermal expansion. Therefore, a Y₂O₃ / Nb₂O₅ ratio of 0.8 to 5.0 is optional, a Y₂O₃ / Nb₂O₅ ratio of 1.0 to 3.0 is optional, and a Y₂O₃ / Nb₂O₅ ratio of 1.35 to 2.0 is further optional. In some implementations, the Y₂O₃ / Nb₂O₅ ratio can be 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, 2.0, 2.05, 2.1, 2.15, 2.2, 2.25, 2.3, 2.35, 2.4, 2.45, 2.5, 2.55, 2.6, 2.65, 2.7, 2.75, 2.8, 2.85. 2.9, 2.95, 3.0, 3.05, 3.1, 3.15, 3.2, 3.25, 3.3, 3.35, 3.4, 3.45, 3.5, 3.55, 3.6, 3.65, 3.7, 3.75, 3.8, 3.85, 3.9, 3.95, 4.0, 4.05, 4.1, 4.15, 4.2, 4.25, 4.3, 4.35, 4.4, 4.45, 4.5, 4.55, 4.6, 4.65, 4.7, 4.75, 4.8, 4.85, 4.9, 4.95, 5.0, 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.

[0043] In some embodiments, controlling the ratio of the total ZnO and Nb2O5 content (ZnO+Nb2O5) to the Y2O3 content (ZnO+Nb2O5) / Y2O3 within the range of 2.0 to 4.0 can improve the glass's resistance to crystallization while reducing its coefficient of thermal expansion. Therefore, a ratio of (ZnO+Nb2O5) / Y2O3 of 2.0 to 4.0 is optional, a ratio of (ZnO+Nb2O5) / Y2O3 of 2.7 to 3.6 is optional, and a ratio of (ZnO+Nb2O5) / Y2O3 of 3.0 to 3.4 is further optional. In some implementations, (ZnO+Nb2O5) / Y2O3 can be 2.0, 2.05, 2.1, 2.15, 2.2, 2.25, 2.3, 2.35, 2.4, 2.45, 2.5, 2.55, 2.6, 2.65, 2.7, 2.75, 2.8, 2.85, 2.9, 2.95, 3.0, 3.05, 3.1, 3.15, 3.2, 3.25, 3.3, 3.35, 3.4, 3.45, 3.5, 3.55, 3.6, 3.65, 3.7, 3.75, 3.8, 3.85, 3.9, 3.95, 4.0, etc., as well as all ranges and subranges between the above values. It should be understood that, in implementations, any of the above ranges can be combined with any other range.

[0044] WO3 can increase the refractive index of glass, lower its transition temperature, and improve its resistance to crystallization. However, if its content is too high, the light transmittance of the glass will decrease. Therefore, the WO3 content in this invention is 1% to 9%, optionally 1.5% to 7%, or optionally 2% to 6%. In some embodiments, the WO3 content can be 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 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.

[0045] In some embodiments, controlling the ratio of WO3 to Nb2O5 (WO3 / Nb2O5) within the range of 0.2 to 1.1 can improve the chemical stability of the glass while lowering its transition temperature. Therefore, a WO3 / Nb2O5 ratio of 0.2 to 1.1 is optional, a WO3 / Nb2O5 ratio of 0.4 to 1.0 is optional, and a WO3 / Nb2O5 ratio of 0.6 to 0.95 is even more optional. In some implementations, WO3 / Nb2O5 can be 0.2, 0.23, 0.25, 0.27, 0.3, 0.33, 0.35, 0.37, 0.4, 0.43, 0.45, 0.47, 0.5, 0.53, 0.55, 0.57, 0.6, 0.63, 0.65, 0.67, 0.7, 0.73, 0.75, 0.77, 0.8, 0.83, 0.85, 0.87, 0.9, 0.93, 0.95, 0.97, 1.0, 1.03, 1.05, 1.07, 1.1, etc., as well as all ranges and subranges between the above values. It should be understood that, in implementations, any of the above ranges can be combined with any other range.

[0046] In some embodiments, controlling the ratio of La2O3 content to the total content of WO3 and Nb2O5 (WO3+Nb2O5), La2O3 / (WO3+Nb2O5), within the range of 2.0 to 5.5 can reduce the density of the glass while increasing its bubble content. Therefore, a La2O3 / (WO3+Nb2O5) ratio of 2.0 to 5.5 is optional, a La2O3 / (WO3+Nb2O5) ratio of 2.5 to 4.5 is optional, and a La2O3 / (WO3+Nb2O5) ratio of 3.1 to 3.7 is further optional. In some implementations, La2O3 / (WO3+Nb2O5) can be 2.0, 2.05, 2.1, 2.15, 2.2, 2.25, 2.3, 2.35, 2.4, 2.45, 2.5, 2.55, 2.6, 2.65, 2.7, 2.75, 2.8, 2.85, 2.9, 2.95, 3.0, 3.05, 3.1, 3.15, 3.2, 3.25, 3.3, 3.35, 3.4, 3.45, 3.5, or 3.5. 5, 3.6, 3.65, 3.7, 3.75, 3.8, 3.85, 3.9, 3.95, 4.0, 4.05, 4.1, 4.15, 4.2, 4.25, 4.3, 4.35, 4.4, 4.45, 4.5, 4.55, 4.6, 4.65, 4.7, 4.75, 4.8, 4.85, 4.9, 4.95, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 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.

[0047] In some embodiments, the ratio (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) between the total content of La2O3, SiO2, and ZnO (La2O3+SiO2+ZnO) and the total content of Nb2O5, WO3, and Gd2O3 (Nb2O5+WO3+Gd2O3) is controlled within the range of 4.5 to 8.0, which can increase the bubble content of the glass while reducing its density. Therefore, the possible values ​​of (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) are 4.5 to 8.0, (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) are 5.0 to 7.0, (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) are 5.5 to 6.8, and (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) are 5.8 to 6.6. In some implementations, (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) can be 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8.0, etc., as well as all ranges and subranges between the above values. It should be understood that, in implementations, any of the above ranges can be combined with any other range.

[0048] TiO2 can improve the refractive index and dispersion of glass, and enhance its thermal stability. However, if its content is too high, the visible light transmittance of the glass decreases, and it is prone to crystallization during the molding process. Therefore, the TiO2 content in this invention is 0-4%, optionally 0.1%-3%, optionally 0.5%-2.5%. 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%, 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%, 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.

[0049] Li₂O can lower the glass transition temperature and improve the glass's meltability, but if its content is too high, the glass's resistance to crystallization deteriorates, and its refractive index decreases. Therefore, the Li₂O content is 0-5%, optionally 0.1%-4%, or optionally 0.5%-3%. In some embodiments, the Li₂O 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.

[0050] In some embodiments, controlling the TiO2 / Li2O ratio (TiO2 / Li2O) within the range of 0.1 to 2.5 can improve both the glass's resistance to crystallization and its light transmittance. Therefore, a TiO2 / Li2O ratio of 0.1 to 2.5 is optional, a TiO2 / Li2O ratio of 0.3 to 2.0 is optional, and a TiO2 / Li2O ratio greater than or equal to 0.5 but less than 1.0 is further optional. In some implementations, TiO2 / Li2O can be 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, 2.0, 2.05, 2.1, 2.15, 2.2, 2.25, 2.3, 2.35, 2.4, 2.45, 2.5, 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.

[0051] Na₂O and K₂O can improve the meltability of glass and adjust its optical constants. However, if their content is too high, the chemical stability and anti-crystallization properties of the glass will deteriorate, drastically increasing volatilization during melting and forming, and leading to a decrease in the glass's refractive index. Therefore, in this invention, the Na₂O content is 0–3%, optionally 0–2%, optionally 0–1%, and further optionally, it does not contain Na₂O. The K₂O content is 0–3%, optionally 0–2%, optionally 0–1%, and further optionally, it does not contain K₂O. In some embodiments, the Na₂O 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%, 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 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%, 2.3%, 2.5%, 2.7%, 3%, 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.

[0052] Al2O3 can reduce the coefficient of thermal expansion of glass, improving its resistance to crystallization and thermal stability. However, excessive Al2O3 content will lead to an increase in the glass transition temperature and a decrease in the glass's meltability. Therefore, in this invention, the Al2O3 content is 0-3%, optionally 0-2%, optionally 0-1%, and further optionally, it contains no Al2O3. In some embodiments, the Al2O3 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%, 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.

[0053] Ta₂O₅ improves the refractive index and devitrification resistance of glass, but if its content is too high, the thermal stability of the glass decreases and the density increases. Furthermore, compared to other components, Ta₂O₅ is very expensive; from a practical and cost-effective perspective, its usage should be minimized. Therefore, the Ta₂O₅ content in this invention is 0-3%, optionally 0-2%, or optionally 0-1%. In some embodiments, it is further optional that Ta₂O₅ is not present. In some embodiments, the Ta₂O₅ 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%, 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.

[0054] In some embodiments, controlling the ratio of the total content of Ta2O5 and Gd2O3 (Ta2O5+Gd2O3) to the content of SiO2 (Ta2O5+Gd2O3) / SiO2 to below 1.0 can prevent the glass from deteriorating in terms of bubble content and weather resistance, ensuring that the glass has both excellent weather resistance and bubble content. Therefore, it is optional that (Ta2O5+Gd2O3) / SiO2 is below 1.0, or below 0.8, further optional that (Ta2O5+Gd2O3) / SiO2 is below 0.5, and even more optional that (Ta2O5+Gd2O3) / SiO2 is below 0.2. In some implementations, (Ta2O5+Gd2O3) / SiO2 can be 0, greater than 0, 0.01, 0.03, 0.05, 0.07, 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, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in implementations, any of the above ranges can be combined with any other range.

[0055] RO (RO being one or more of MgO, CaO, SrO, and BaO) can improve the meltability of glass and adjust its optical constants. However, if its content is too high, the glass's resistance to crystallization decreases. Therefore, in this invention, the RO content is 0-3%, optionally 0-2%, optionally 0-1%, and further optionally RO-free. In some embodiments, it is further optional that MgO is not present, and / or that CaO is not present, and / or that SrO is not present, and / or that BaO is not present. 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%, 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. In some implementation schemes, the CaO 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%, etc., as well as all ranges and sub-ranges 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. In some embodiments, the SrO 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%, 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 BaO 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%, 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.

[0056] GeO2 improves the refractive index and devitrification resistance of glass, but excessive content reduces its chemical stability. Furthermore, GeO2 is very expensive compared to other components, and its usage should be minimized from the perspective of glass raw material costs. Therefore, the GeO2 content in this invention is 0-3%, optionally 0-2%, optionally 0-1%, and further optionally, it contains 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%, 2.3%, 2.5%, 2.7%, 3%, 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.

[0057] P2O5 can improve the devitrification resistance of glass, but if its content is too high, the chemical stability and resistance to crystallization of the glass will decrease. Therefore, the P2O5 content is 0-3%, optionally 0-2%, optionally 0-1%, and further optionally, it contains no P2O5. In some embodiments, the P2O5 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%, 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.

[0058] In this invention, by using one or more components selected from Sb₂O₃, SnO₂, and CeO₂ as a clarifying agent containing 0-1%, the clarification effect of the glass can be improved, and the bubble content of the glass can be reduced. The content of the clarifying agent can be 0-0.5%, or 0-0.2%. In some embodiments, the content of the clarifying agent can be 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%, 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.

[0059] It is understood that, in some embodiments, the optical glass is composed of the following components, expressed as a weight percentage: B2O3: 13%–23%; SiO2: 1%–9%; La2O3: 26%–37%; Y2O3: 4%–14%; ZrO2: greater than 0% but less than or equal to 9%; ZnO: 16%–26%; Nb2O5: 1%–9%; WO3: 1%–9%; TiO2: 0–4%; Li2O: 0–5%; Gd2O3: 0–4%; Yb2O3: 0–5%; Na2O: 0–3%; K2O: 0–3%; Al2O3: 0–3%; Ta2O5: 0–3%; RO: 0–3%; GeO2: 0–3%; P2O5: 0–3%; clarifying agent: 0–1%.

[0060] <Components that should not be present>

[0061] 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 to omit these oxides, especially for optical glass where transmittance in the visible light region is required.

[0062] 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 eliminate these substances, except where their contamination is unavoidable. Consequently, the optical glass becomes virtually free of pollutants. Therefore, the optical glass of this invention can be manufactured, processed, and disposed of even without specific environmental countermeasures.

[0063] To achieve environmental friendliness, the optical glass of this invention may be selected to be free of As2O3 and PbO.

[0064] The terms "not containing" and "0% by weight" or "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 may be present in small or trace amounts in the final optical glass. Such cases are also within the scope of protection of this patent.

[0065] The performance of the optical glass of the present invention will now be described.

[0066] <Refractive Index and Abbe Number>

[0067] The refractive index (n) of optical glass d ) and Abbe number (ν) d Tested according to the method specified in the national standard GB / T 7962.1—2010.

[0068] In some embodiments, the refractive index (n) of the optical glass of the present invention is... d The lower limit for (n) is 1.785, with an optional lower limit of 1.790 and an optional lower limit of 1.800. In some embodiments, the refractive index (n) of the optical glass of the present invention is... d The upper limit for the refractive index (n) is 1.835, with optional upper limits of 1.830 and 1.820. In some implementations, the refractive index (n) is... d The range can be 1.785, 1.787, 1.790, 1.793, 1.795, 1.797, 1.800, 1.803, 1.805, 1.807, 1.810, 1.813, 1.815, 1.817, 1.820, 1.823, 1.825, 1.827, 1.830, 1.833, 1.835, etc., as well as all ranges and subranges between the above values.

[0069] In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The lower limit for (ν) is 38, with optional lower limits of 39 and 40. In some embodiments, the Abbe number (ν) of the optical glass of the present invention is... d The upper limit for the number of Abbe numbers is 44, with optional upper limits of 43 and 42. In some implementations, the Abbe number (ν) is... d The range can be 38, 38.3, 38.5, 38.7, 39, 39.3, 39.5, 39.7, 40, 40.3, 40.5, 40.7, 41, 41.3, 41.5, 41.7, 42, 42.3, 42.5, 42.7, 43, 43.3, 43.5, 43.7, 44, etc., as well as all ranges and subranges between the above values.

[0070] Coefficient of thermal expansion

[0071] The coefficient of thermal expansion of optical glass (α) 100℃ / 300℃ Data were tested at 100℃~300℃ according to the method specified in the national standard GB / T7962.16—2010.

[0072] In some embodiments, the coefficient of thermal expansion (α) of the optical glass of the present invention is... 100℃ / 300℃ ) is 100×10 -7 For values ​​below / K, 95×10 can be selected. -7 For values ​​below / K, 90×10 can be selected. -7Below / K, a further option is 87×10 -7 / K or below. In some embodiments, the coefficient of thermal expansion (α) 100℃ / 300℃ ) can be 100×10 -7 / K、99×10 -7 / K、98×10 -7 / K、97×10 -7 / K、96×10 -7 / K、95×10 -7 / K、94×10 -7 / K、93×10 -7 / K、92×10 -7 / K、91×10 -7 / K、90×10 -7 / K、89×10 -7 / K、88×10 -7 / K、87×10 -7 / K、86×10 -7 / K、85×10 -7 / K、84×10 -7 / K、83×10 -7 / K、82×10 -7 / K、81×10 -7 / K、80×10 -7 / K, etc., and all ranges and subranges between the above values.

[0073] <Stability under water resistance>

[0074] Water resistance stability of optical glass (D) W (Powder method) Tested according to the method specified in the national standard GB / T 17129.

[0075] In some embodiments, the water resistance stability (D) of the optical glass of the present invention is... W If there are two or more categories, one category can be selected.

[0076] <Weather resistance>

[0077] The weather resistance (CR) test method for optical glass is as follows: The glass sample is placed in a test chamber with a relative humidity of 90% saturated water vapor, and the temperature is alternately cyclical at 40℃ to 50℃ every 1 hour, 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.

[0078] Table 1.

[0079]

[0080] In some embodiments, the weather resistance (CR) of the optical glass of the present invention is Class 2 or above, and can be Class 1.

[0081] <Effervescence>

[0082] The bubble degree of optical glass is tested according to the method specified in the national standard GB / T7962.8—2010.

[0083] In some embodiments, the bubble degree of the optical glass of the present invention is grade A or above, optionally grade A0 or above, optionally grade A. 00 class.

[0084] <Density>

[0085] The density (ρ) of optical glass is tested according to the method specified in the national standard GB / T7962.20—2010.

[0086] In some embodiments, the density (ρ) of the optical glass of the present invention is 4.80 g / cm³. 3 The following can be selected as 4.70 g / cm³. 3 The following can be selected as 4.60 g / cm³. 3 The following can be further selected as 4.50 g / cm³. 3 Below. In some embodiments, the density (ρ) can be 4.80 g / cm³. 3 4.79 g / cm 3 4.78 g / cm 3 4.77 g / cm 3 4.76 g / cm 3 4.75g / cm 3 4.74 g / cm 3 4.73 g / cm 3 4.72 g / cm 3 4.71 g / cm 3 4.70 g / cm 3 4.69 g / cm 3 4.68 g / cm 3 4.67 g / cm 3 4.66 g / cm 3 4.65g / cm 3 4.64 g / cm 3 4.63 g / cm 3 4.62 g / cm 3 4.61 g / cm 3 4.60 g / cm 3 4.59g / cm 3 4.58g / cm 3 4.57 g / cm3 4.56 g / cm 3 4.55g / cm 3 4.54 g / cm 3 4.53 g / cm 3 4.52g / cm 3 4.51 g / cm 3 4.50g / cm 3 4.49 g / cm 3 4.48 g / cm 3 4.47 g / cm 3 4.46 g / cm 3 4.45g / cm 3 4.44 g / cm 3 4.43 g / cm 3 4.42 g / cm 3 4.41 g / cm 3 4.40 g / cm 3 And so on, as well as all ranges and subranges between the above values.

[0087] <Transition Temperature>

[0088] Transition temperature of optical glass (T) g Test according to the method specified in the national standard GB / T7962.16—2010.

[0089] In some embodiments, the transition temperature (T) of the optical glass of the present invention is... g The temperature is below 600°C, optionally below 580°C, optionally below 570°C, and further optionally below 560°C. In some embodiments, the transition temperature (T) is... g The values ​​can be 550℃, 553℃, 555℃, 557℃, 560℃, 563℃, 565℃, 567℃, 570℃, 573℃, 575℃, 577℃, 580℃, 583℃, 585℃, 587℃, 590℃, 593℃, 595℃, 597℃, 600℃, etc., as well as all ranges and subranges between the above values.

[0090] <shading>

[0091] The short-wavelength transmission spectral characteristics of the glass of this invention are expressed using colorimetry (λ). 80 ) represents. λ 80 This refers to the wavelength corresponding to a glass transmittance of 80%. λ 80The 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 80% 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 quantity represented includes the transmittance, which accounts for the surface reflection loss on the aforementioned surfaces of the glass. In optical glass, λ 80 A smaller value means that the glass itself has less coloration and higher light transmittance.

[0092] In some embodiments, the tinting strength (λ) of the optical glass of the present invention 80 The tinting density (λ) of the optical glass is below 400 nm, optionally below 390 nm, optionally below 385 nm, and further optionally below 380 nm. In some embodiments, the tinting density (λ) of the optical glass is... 80 The range can be 370nm, 371nm, 372nm, 373nm, 374nm, 375nm, 376nm, 377nm, 378nm, 379nm, 380nm, 381nm, 382nm, 383nm, 384nm, 385nm, 386nm, 387nm, 388nm, 389nm, 390nm, 391nm, 392nm, 393nm, 394nm, 395nm, 396nm, 397nm, 398nm, 399nm, 400nm, etc., as well as all ranges and subranges between the above values.

[0093] <Upper limit temperature for crystallization>

[0094] The upper limit temperature for crystallization of optical glass was determined using the gradient furnace method. A glass sample measuring 180×10×10 mm was prepared, polished on the sides, and placed in a furnace with a temperature gradient (10℃ / cm) and a maximum temperature zone of 1200℃ for 4 hours. After being removed and allowed to cool naturally to room temperature, the crystallization was observed under a microscope. The highest temperature at which crystals appeared was defined as the upper limit temperature for crystallization. A lower upper limit temperature indicates better resistance to crystallization.

[0095] In some embodiments, the upper limit temperature for crystallization of the optical glass of the present invention is below 1080°C, optionally below 1050°C, optionally below 1000°C, and further optionally below 990°C. In some embodiments, the upper limit temperature for crystallization of the optical glass is 940°C, 950°C, 960°C, 970°C, 980°C, 990°C, 1000°C, 1010°C, 1020°C, 1030°C, 1040°C, 1050°C, 1060°C, 1070°C, 1080°C, etc., as well as all ranges and sub-ranges between the above values.

[0096] [Manufacturing methods for optical glass]

[0097] The manufacturing method of the optical glass of this invention is as follows: The glass of this invention is produced using conventional raw materials and processes, including but not limited to using oxides, hydroxides, complex salts (such as carbonates, nitrates, sulfates, etc.), boric acid, etc. as raw materials. After the raw materials are prepared according to conventional methods, the prepared furnace charge is put into a melting furnace (such as a platinum or platinum alloy crucible) at 1150℃~1400℃ for melting. After clarification and homogenization, a homogeneous molten glass without bubbles and undissolved substances is obtained. This molten glass is then cast in a mold and annealed. Those skilled in the art can appropriately select raw materials, process methods, and process parameters according to actual needs.

[0098] [Glass preforms and optical components]

[0099] 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.

[0100] As described above, the optical glass of the present invention is useful for various optical components and optical designs. In particular, the optical glass of the present invention can be used to form a preform, which can be used for hot pressing, precision stamping, etc., to manufacture optical components such as lenses and prisms.

[0101] 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.

[0102] 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.

[0103] [Optical Instruments]

[0104] 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.

[0105] Example

[0106] <Example of Optical Glass>

[0107] To further illustrate and explain the technical solution of the present invention, the following non-limiting embodiments are provided.

[0108] In this embodiment, optical glass with the composition shown in Tables 2 to 4 was obtained using the optical glass manufacturing method described above. Furthermore, the properties of each glass were measured using the testing method described in this invention, and the measurement results are shown in Tables 2 to 4.

[0109] Table 2.

[0110]

[0111] Table 3.

[0112]

[0113] Table 4.

[0114]

[0115] <Example of Glass Prefabricated Components>

[0116] The glass obtained from optical glass Examples 1 to 15# is used to manufacture preforms of various lenses and prisms, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses, by means of grinding, hot pressing, precision stamping, or other molding methods.

[0117] <Optical Component Examples>

[0118] 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.

[0119] 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.

[0120] <Examples of Optical Instruments>

[0121] 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: B2O3: 13%–23%; SiO2: 1%–9%; La2O3: 26%–37%; Y2O3: 4%–14%; ZrO2: greater than 0% but less than or equal to 9%. ZnO: 16%~26%; Nb2O5: 1%~9%; WO3: 1%~9%, of which La2O3 / (WO3+Nb2O5) is 2.0~5.

5.

2. The optical glass according to claim 1, characterized in that, Its components, expressed as a weight percentage, also contain: TiO2: 0–4%; and / or Li2O: 0–5%; and / or Gd2O3: 0–4%; and / or Yb2O3: 0–5%; and / or Na2O: 0–3%; and / or K2O: 0–3%; and / or Al2O3: 0–3%; and / or Ta2O5: 0–3%; and / or RO: 0–3%; and / or GeO2: 0–3%; and / or P2O5: 0–3%; and / or clarifying agent: 0–1%, wherein the RO is one or more of MgO, CaO, SrO, and BaO, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

3. Optical glass, characterized in that, Its composition includes B2O3, SiO2, La2O3, Y2O3, ZrO2, ZnO, Nb2O5, and WO3, expressed as a weight percentage. The ratio of La2O3 / (WO3+Nb2O5) is 2.0–5.

5. The optical glass has a refractive index of 1.785–1.835, an Abbe number of 38–44, and a density of 4.80 g / cm³. 3 the following.

4. The optical glass according to claim 3, characterized in that, Its composition, expressed as a weight percentage, contains: B2O3: 13%–23%; and / or SiO2: 1%–9%; and / or La2O3: 26%–37%; and / or Y2O3: 4%–14%; and / or ZrO2: greater than 0% but less than or equal to 9%; and / or ZnO: 16%–26%; and / or Nb2O5: 1%–9%; and / or WO3: 1%–9%; and / or TiO2: 0%–4%; and / or Li2O: 0%–5%; and / or Gd2O3: 0%–4%; ~4%; and / or Yb2O3: 0~5%; and / or Na2O: 0~3%; and / or K2O: 0~3%; and / or Al2O3: 0~3%; and / or Ta2O5: 0~3%; and / or RO: 0~3%; and / or GeO2: 0~3%; and / or P2O5: 0~3%; and / or clarifying agent: 0~1%, wherein the RO is one or more of MgO, CaO, SrO, and BaO, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

5. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage and meet one or more of the following nine conditions: 1) The ratio of La2O3 / (WO3+Nb2O5) is 2.5 to 4.5, and the ratio of La2O3 / (WO3+Nb2O5) can be selected as 3.1 to 3.7; 2) The ratio of (ZnO+Nb2O5) / Y2O3 is 2.0 to 4.0, and can be selected as 2.7 to 3.6, or can be selected as 3.0 to 3.4; 3) The Y2O3 / Nb2O5 ratio is 0.8–5.0, and can be 1.0–3.0 or 1.35–2.

0. 4) The WO3 / Nb2O5 ratio is 0.2–1.1, and can be 0.4–1.0 or 0.6–0.

95. 5) The ratio of (La2O3+Y2O3) / B2O3 is 1.6 to 3.0, and (La2O3+Y2O3) / B2O3 can be 1.8 to 2.8, or (La2O3+Y2O3) / B2O3 can be 2.0 to 2.

4. 6) ZnO / B2O3 ratio is 0.8 to 1.8, ZnO / B2O3 ratio can be 1.0 to 1.6, and ZnO / B2O3 ratio can be greater than 1.0 but less than or equal to 1.4; 7) The TiO2 / Li2O ratio is 0.1 to 2.5, and the optional TiO2 / Li2O ratio is 0.3 to 2.0, or the optional TiO2 / Li2O ratio is greater than or equal to 0.5 but less than 1.0; 8) (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) is 4.5~8.0, (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) is 5.0~7.0, (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) is 5.5~6.8, and further (La2O3+SiO2+ZnO) / (Nb2O5+WO3+Gd2O3) is 5.8~6.6; 9. (Ta2O5+Gd2O3) / SiO2 is 1.0 or less, (Ta2O5+Gd2O3) / SiO2 can be 0.8 or less, (Ta2O5+Gd2O3) / SiO2 can be 0.5 or less, and (Ta2O5+Gd2O3) / SiO2 can be 0.2 or less.

6. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, including: B2O3: 15%–21%, optional B2O3: 17%–20%; and / or SiO2: 2%–8%, optional SiO2: 3%–7%; and / or La2O3: 28%–35%, optional La2O3: 30%–33%; and / or Y2O3: 6%–12%, optional Y2O3: 7%–10%; and / or ZrO2: 1%–7%, optional ZrO2: 2%–5%; and / or ZnO: 18%–24%, optional ZnO: 1%–24%. nO: 19%–22%; and / or Nb2O5: 2%–8%, optional Nb2O5: 3%–7%; and / or WO3: 1.5%–7%, optional WO3: 2%–6%; and / or TiO2: 0.1%–3%, optional TiO2: 0.5%–2.5%; and / or Li2O: 0.1%–4%, optional Li2O: 0.5%–3%; and / or Gd2O3: 0–2%, optional Gd2O3: 0–1%, optional Gd2O3 not containing; and / or Yb2O3 : 0-2%, optional Yb2O3; 0-1%, optional not containing Yb2O3; and / or Na2O: 0-2%, optional Na2O; 0-1%, optional not containing Na2O; and / or K2O: 0-2%, optional K2O; 0-1%, optional not containing K2O; and / or Al2O3: 0-2%, optional Al2O3; 0-1%, optional not containing Al2O3; and / or Ta2O5: 0-2%, optional Ta2O5; 0-1%, optional not containing Ta2O5; and / or R O: 0-2%, optional; RO: 0-1%, optional (without RO); and / or GeO2: 0-2%, optional; GeO2: 0-1%, optional (without GeO2); and / or P2O5: 0-2%, optional; P2O5: 0-1%, optional (without P2O5); and / or clarifying agent: 0-0.5%, optional (within 0-0.2%), wherein the RO is one or more of MgO, CaO, SrO, and BaO, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

7. The optical glass according to any one of claims 1 to 4, characterized in that, The optical glass has a refractive index of 1.785–1.835, optionally 1.790–1.830, optionally 1.800–1.820, and an Abbe number of 38–44, optionally 39–43, optionally 40–42.

8. The optical glass according to any one of claims 1 to 4, characterized in that, The coefficient of thermal expansion of the optical glass is α 100℃ / 300℃ 100×10 -7 For values ​​below / K, 95×10 can be selected. -7 For values ​​below / K, 90×10 can be selected. -7 Below / K, a further option is 87×10 -7 / K or below; and / or water resistance stability of Class 2 or above, Class 1 can be selected; and / or weather resistance of Class 2 or above, Class 1 can be selected; and / or foaming degree of Grade A or above, Grade A0 or above can be selected. 00 Grade; and / or density of 4.80 g / cm³ 3 The following can be selected as 4.70 g / cm³. 3 The following can be selected as 4.60 g / cm³. 3 The following can be further selected as 4.50 g / cm³. 3 The following; and / or a transition temperature of 600°C or below, optionally 580°C or below, optionally 570°C or below, and further optionally 560°C or below; and / or a chromaticity λ 80 The maximum temperature is below 400nm, optionally below 390nm, optionally below 385nm, and further optionally below 380nm; and / or the maximum crystallization temperature is below 1080℃, optionally below 1050℃, optionally below 1000℃, and further optionally below 990℃.

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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