Optical glass, optical elements and optical instruments

Abstract

The present invention provides an optical glass comprising, by weight, 1-12% SiO2, 5-18% B2O3, 40-60% La2O3, 4-20% Y2O3, 1-12% ZrO2, 4-20% Nb2O5, and 4-18% TiO2. Through rational component design, the present invention can produce optical glass with excellent devitrification resistance at a low raw material cost.

Description

Technical Field

[0001] The present invention relates to optical glass, in particular to optical glass with a refractive index of 1.92-1.98 and an Abbe number of 29-36, and optical elements and optical instruments made of the same. Background Art

[0002] In recent years, with the advancement of technology and the continuous upgrading of optoelectronic information products, the demand for optical glass has gradually increased, and at the same time, higher performance requirements have been placed on optical glass. At the same radius of curvature, the higher the refractive index of the glass, the larger the imaging field of view. With the trend of miniaturization of optical devices, the demand for high-refractive-index glass is becoming increasingly prominent. Optical glass with a refractive index of 1.92 to 1.98 and an Abbe number of 29 to 36 is easier to miniaturize, ultra-thin, and widen the angle of view due to its high refractive index, and its application scenarios are relatively broad.

[0003] Due to the high demand for high-refractive-index optical glass, it is hoped that it can be manufactured at a lower raw material cost to improve the sustainable supply capacity. CN110128005A discloses a high-refractive-index optical glass with a refractive index of 1.87 or higher and an Abbe number of 40 or lower. It contains a large amount of Gd2O3 and WO3, which is not conducive to cost control. JP2019-11232A discloses a high-refractive-index optical glass, which contains a large amount of BaO and has a need for improved devitrification resistance. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an optical glass with low raw material cost and excellent devitrification resistance.

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

[0006] Optical glass, whose components are expressed in weight percentage, contains: SiO2: 1-12%; B2O3: 5-18%; La2O3: 40-60%; Y2O3: 4-20%; ZrO2: 1-12%; Nb2O5: 4-20%; TiO2: 4-18%.

[0007] Furthermore, the optical glass, whose components are expressed in weight percentage, also contains: Gd2O3: 0-9%; and / or Ta2O5: 0-8%; and / or RO: 0-9%; and / or Rn2O: 0-6%; and / or WO3: 0-6%; and / or ZnO: 0-8%; and / or Al2O3: 0-5%; and / or Yb2O3: 0-10%; and / or GeO2: 0-5%; and / or clarifier: 0-2%, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO, SnO2, and CeO2.

[0008] The optical glass comprises, expressed in weight percentage, 1-12% SiO2, 5-18% B2O3, 40-60% La2O3, 4-20% Y2O3, 1-12% ZrO2, 4-20% Nb2O5, 4-18% TiO2, 0-9% Gd2O3, 0-8% Ta2O5, 0-9% RO, 0-6% Rn2O, 0-6% WO3, 0-6% ZnO, 0-8% Al2O3, 0-5% Yb2O3, 0-10% GeO2, and 0-2% clarifier, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO, SnO2, and CeO2.

[0009] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: La2O3+Y2O3+Gd2O3 is 46-70%, preferably La2O3+Y2O3+Gd2O3 is 50-68%, and more preferably La2O3+Y2O3+Gd2O3 is 55-65%.

[0010] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: SiO2+B2O3 is 8-28%, preferably SiO2+B2O3 is 10-25%, and more preferably SiO2+B2O3 is 12-20%.

[0011] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (B2O3+TiO2) / (SiO2+ZnO) is 1.0~10.0, preferably (B2O3+TiO2) / (SiO2+ZnO) is 1.0~8.0, more preferably (B2O3+TiO2) / (SiO2+ZnO) is 1.5~7.0, and further preferably (B2O3+TiO2) / (SiO2+ZnO) is 2.0~5.0.

[0012] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (Ta2O5+Gd2O3) / Y2O3 is less than 1.0, preferably (Ta2O5+Gd2O3) / Y2O3 is less than 0.6, more preferably (Ta2O5+Gd2O3) / Y2O3 is less than 0.4, and further preferably (Ta2O5+Gd2O3) / Y2O3 is less than 0.1.

[0013] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: TiO2 / Y2O3 is 0.3-4.0, preferably TiO2 / Y2O3 is 0.5-3.0, more preferably TiO2 / Y2O3 is 0.6-2.0, and further preferably TiO2 / Y2O3 is 0.75-1.5.

[0014] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: Y2O3 / B2O3 is 0.4-3.0, preferably Y2O3 / B2O3 is 0.5-2.5, more preferably Y2O3 / B2O3 is 0.6-1.5, and further preferably Y2O3 / B2O3 is 0.7-1.2.

[0015] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: La2O3 / (TiO2+Nb2O5) is 1.2~6.0, preferably La2O3 / (TiO2+Nb2O5) is 1.5~5.0, more preferably La2O3 / (TiO2+Nb2O5) is 2.0~4.0, and further preferably La2O3 / (TiO2+Nb2O5) is 2.5~3.5.

[0016] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: TiO2 / (Nb2O5+WO3) is 0.3~3.0, preferably TiO2 / (Nb2O5+WO3) is 0.4~2.0, more preferably TiO2 / (Nb2O5+WO3) is 0.6~1.5, and further preferably TiO2 / (Nb2O5+WO3) is 0.8~1.3.

[0017] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: ZnO / (SiO2+B2O3) is less than 0.5, preferably ZnO / (SiO2+B2O3) is less than 0.3, more preferably ZnO / (SiO2+B2O3) is less than 0.2, and further preferably ZnO / (SiO2+B2O3) is less than 0.1.

[0018] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (Gd2O3+ZnO) / Y2O3 is less than 1.0, preferably (Gd2O3+ZnO) / Y2O3 is less than 0.6, more preferably (Gd2O3+ZnO) / Y2O3 is less than 0.3, and further preferably (Gd2O3+ZnO) / Y2O3 is less than 0.1.

[0019] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: WO3 / Y2O3 is less than 0.8, preferably WO3 / Y2O3 is less than 0.6, more preferably WO3 / Y2O3 is 0.02-0.5, and further preferably WO3 / Y2O3 is 0.05-0.3.

[0020] Furthermore, the optical glass, wherein the components are expressed in weight percentage, wherein: SiO2: 2-10%, preferably SiO2: 4-9%; and / or B2O3: 6-14%, preferably B2O3: 7-12%; and / or La2O3: 43-58%, preferably La2O3: 46-53%; and / or Y2O3: 5-15%, preferably Y2O3: 6-12%; and / or ZrO2: 3-10%, preferably ZrO2: 4-9%; and / or Nb2O5: 5-15%, preferably Nb2O5: 7-12%; and / or Ta2O5: 0-4%, preferably Ta2O5: 0-2%; and / or Gd2O3: 0-5%, preferably Gd2O3: 0-3%, more preferably Gd2O3: 0-1%; and / or TiO2: 5-13%, preferably TiO2: 6-12 %; and / or RO: 0-4%, preferably RO: 0-2%; and / or Rn2O: 0-4%, preferably Rn2O: 0-1%; and / or WO3: 0-4%, preferably WO3: 0.5-3%; and / or ZnO: 0-4%, preferably ZnO: 0-2%; and / or Al2O3: 0-3%, preferably Al2O3: 0-1%; and / or Yb2O3: 0-5%, preferably Yb2O3: 0-1%; and / or GeO2: 0-3%, preferably GeO2: 0-1%; and / or clarifier: 0-1%, preferably clarifier: 0-0.5%, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO, SnO2, and CeO2.

[0021] Furthermore, the optical glass, whose components are expressed in weight percentage, has a total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 of more than 88%, preferably a total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 of more than 90%, more preferably a total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 of more than 92%, and further preferably a total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 of more than 95%.

[0022] Furthermore, the optical glass does not contain Ta2O5; and / or does not contain Yb2O3; and / or does not contain RO; and / or does not contain Rn2O; and / or does not contain ZnO; and / or does not contain Al2O3; and / or does not contain GeO2 in its components, and the RO is one or more of MgO, CaO, SrO, and BaO, and Rn2O is one or more of Li2O, Na2O, and K2O.

[0023] Furthermore, the refractive index n of the optical glass is d is 1.92 to 1.98, preferably 1.93 to 1.97, more preferably 1.94 to 1.96, and the Abbe number v d It is 29-36, preferably 30-35, and more preferably 31-34.

[0024] Furthermore, the density of the optical glass is 5.10 g / cm 3 Below, preferably 5.00 g / cm 3 Below, more preferably 4.95g / cm 3 Below; and / or thermal expansion coefficient α -30 / 70℃ 85×10 -7 / K or less, preferably 80×10 -7 / K or less, more preferably 75×10 -7 / K or less, more preferably 70×10 -7 / K or less; and / or water resistance stability D W 2 or more, preferably 1; and / or acid resistance stability D A Two or more types, preferably one type; and / or 70 425nm or less, preferably λ 70 420nm or less, more preferably λ 70415nm or less; and / or λ5 is 375nm or less, preferably λ5 is 370nm or less, more preferably λ5 is 365nm or less; and / or weather resistance CR is 2 or more, preferably 1; and / or Knoop hardness H K 650×10 7 Pa or more, preferably 660×10 7 Pa or more, more preferably 670×10 7 Pa or more, more preferably 680×10 7 Pa or more; and / or Young's modulus E is 11000×10 7 Pa~15000×10 7 Pa, preferably 11500×10 7 Pa~14500×10 7 Pa, more preferably 12000×10 7 Pa~14000×10 7 Pa, more preferably 12500×10 7 Pa~13500×10 7 Pa; and / or the bubble degree is A grade or above, preferably A0 grade or above, more preferably A 00 Grade; and / or wear degree F A It is 80-130, preferably 90-120, and more preferably 95-115.

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

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

[0027] An optical instrument contains the above-mentioned optical glass and / or contains the above-mentioned optical element.

[0028] The beneficial effects of the present invention are: through reasonable component design, the present invention can obtain optical glass with excellent devitrification resistance at a lower raw material cost. DETAILED DESCRIPTION

[0029] The following describes in detail embodiments of the optical glass of the present invention. However, the present invention is not limited to the embodiments described below and can be implemented with appropriate modifications within the scope of the present invention. Furthermore, although repeated descriptions may be omitted as appropriate, this does not limit the scope of the invention. In the following description, the optical glass of the present invention may be simply referred to as "glass."

[0030] [Optical glass]

[0031] The following describes the ranges of the various components (ingredients) of the optical glass of the present invention. In the present invention, unless otherwise specified, the content and total content of each component are all expressed in weight percentage (wt%), that is, the content and total content of each component are expressed as the weight percentage of the total amount of the glass material converted into an oxide composition. Here, the "composition converted into oxides" refers to the case where the oxides, complex salts, hydroxides, etc. used as raw materials for the optical glass of the present invention decompose and convert to oxides during melting, with the total amount of the oxide material being taken as 100%.

[0032] Unless otherwise indicated in specific circumstances, the numerical ranges listed in the present invention include upper and lower limits, and "above" and "below" include the endpoint values, as well as all integers and fractions included in the range, without being limited to the specific values listed when defining the range. The term "and / or" herein is inclusive, for example, "A and / or B" means only A, or only B, or both A and B.

[0033] <Essential Components and Optional Components>

[0034] B2O3, in the present invention, is a network-forming component that improves the thermal stability and meltability of glass. This effect is achieved by containing 5% or more B2O3. Preferably, the B2O3 content is 6% or more, and more preferably, 7% or more. Excessive B2O3 content reduces the refractive index of the glass and impairs its chemical stability. Therefore, the upper limit of the B2O3 content in the present invention is 18%, preferably 14%, and more preferably 12%.

[0035] SiO2 has the effect of improving the chemical stability of glass, maintaining the viscosity suitable for molten glass molding, and reducing the erosion of refractory materials. If its content is too high, the melting difficulty of glass increases and it is also unfavorable to lowering the transition temperature of glass. Therefore, in the present invention, the content of SiO2 is 1-12%, preferably 2-10%, and more preferably 4-9%.

[0036] In some embodiments, by controlling the combined content of SiO2 and B2O3 (SiO2 + B2O3) within a range of 8-28%, the glass's abrasion resistance and weather resistance can be optimized while maintaining glass formation stability, thereby preventing a decrease in the glass's devitrification resistance. Therefore, the SiO2 + B2O3 content is preferably 8-28%, more preferably 10-25%, and even more preferably 12-20%.

[0037] La2O3 is an effective component for increasing the refractive index of glass and significantly improves its chemical stability and resistance to devitrification. However, if its content is less than 40%, achieving the desired optical constants is difficult. If it exceeds 60%, the glass's tendency to devitrify increases, and its thermal stability deteriorates. Therefore, the La2O3 content is limited to 40-60%, preferably 43-58%, and more preferably 46-53%.

[0038] Y2O3 can increase the refractive index and devitrification resistance of glass and adjust the Young's modulus of glass. The present invention achieves these effects by containing at least 4% Y2O3. If the content exceeds 20%, the chemical stability and weather resistance of the glass deteriorate. Therefore, the Y2O3 content in the present invention is 4-20%, preferably 5-15%, and more preferably 6-12%.

[0039] In some embodiments, controlling the ratio of the Y2O3 content to the B2O3 content (Y2O3 / B2O3) within the range of 0.4 to 3.0 is beneficial for achieving an appropriate Young's modulus in the glass. Therefore, a Y2O3 / B2O3 ratio of 0.4 to 3.0 is preferred, with a Y2O3 / B2O3 ratio of 0.5 to 2.5 being more preferred. Furthermore, controlling the Y2O3 / B2O3 ratio within the range of 0.6 to 1.5 is beneficial for further reducing the thermal expansion coefficient of the glass and optimizing the bubble content of the glass. Therefore, a Y2O3 / B2O3 ratio of 0.6 to 1.5 is further preferred, with a Y2O3 / B2O3 ratio of 0.7 to 1.2 being even more preferred.

[0040] Gd2O3 can improve the refractive index and chemical stability of glass, but if its content is too high, the glass's devitrification resistance and abrasion resistance will deteriorate, and the cost of the glass will increase. Therefore, the Gd2O3 content is 0-9%, preferably 0-5%, more preferably 0-3%, and even more preferably 0-1%.

[0041] In some embodiments, by controlling the combined content of La2O3, Y2O3, and Gd2O3 (La2O3+Y2O3+Gd2O3) within a range of 46-70%, the glass more easily achieves a desired refractive index and Abbe number, while also optimizing the glass's devitrification resistance and weather resistance. Therefore, the La2O3+Y2O3+Gd2O3 content is preferably 46-70%, more preferably 50-68%, and even more preferably 55-65%.

[0042] Yb2O3 is also a component that imparts high refractive index and low dispersion properties to glass. If its content exceeds 10%, the glass's anti-devitrification properties decrease. Therefore, the Yb2O3 content is 0-10%, preferably 0-5%, more preferably 0-1%, and even more preferably, no Yb2O3 is present.

[0043] ZrO2 can increase the viscosity, hardness, refractive index, and chemical stability of optical glass, and can also reduce the thermal expansion coefficient of the glass. However, when the ZrO2 content is too high, the glass's resistance to devitrification decreases, melting becomes more difficult, the melting temperature rises, and inclusions form within the glass, resulting in a decrease in light transmittance. Therefore, the ZrO2 content in the present invention is 1-12%, preferably 3-10%, and more preferably 4-9%.

[0044] TiO2 is a high-refractive and high-dispersion component that can significantly increase the refractive index and dispersion of glass. The inventors have found that an appropriate amount of TiO2 can increase glass stability; however, excessive amounts significantly reduce the transmittance of the glass and deteriorate its chemical stability. Therefore, the TiO2 content in the present invention is 4-18%, preferably 5-13%, and more preferably 6-12%.

[0045] In some embodiments, controlling the ratio of TiO2 to Y2O3 (TiO2 / Y2O3) within a range of 0.3 to 4.0 can optimize the abrasion resistance and weather resistance of the glass. Therefore, a TiO2 / Y2O3 ratio of 0.3 to 4.0 is preferred, with a TiO2 / Y2O3 ratio of 0.5 to 3.0 being more preferred. Furthermore, controlling the TiO2 / Y2O3 ratio within a range of 0.6 to 2.0 can further improve the chemical stability and blistering of the glass. Therefore, a TiO2 / Y2O3 ratio of 0.6 to 2.0 is further preferred, with a TiO2 / Y2O3 ratio of 0.75 to 1.5 being even more preferred.

[0046] Nb2O5 is a high-refractive, high-dispersion component that can increase the refractive index and devitrification resistance of glass and reduce its thermal expansion coefficient. In the present invention, this effect is achieved by containing 4% or more Nb2O5. The preferred lower limit for the Nb2O5 content is 5%, and more preferably 7%. If the Nb2O5 content exceeds 20%, the thermal stability and weather resistance of the glass decrease, and the light transmittance falls. Therefore, in the present invention, the upper limit for the Nb2O5 content is 20%, preferably 15%, and more preferably 12%.

[0047] In some embodiments, controlling the ratio of the La2O3 content to the total content of TiO2 and Nb2O5, La2O3 / (TiO2+Nb2O5), within the range of 1.2 to 6.0 is beneficial to improving the Young's modulus of the glass and preventing a decrease in the light transmittance of the glass. Therefore, La2O3 / (TiO2+Nb2O5) is preferably 1.2 to 6.0, and more preferably La2O3 / (TiO2+Nb2O5) is 1.5 to 5.0. Furthermore, controlling La2O3 / (TiO2+Nb2O5) within the range of 2.0 to 4.0 can further reduce the density and thermal expansion coefficient of the glass. Therefore, La2O3 / (TiO2+Nb2O5) is more preferably 2.0 to 4.0, and even more preferably La2O3 / (TiO2+Nb2O5) is 2.5 to 3.5.

[0048] Alkaline earth metal oxides (RO) (RO is one or more of MgO, CaO, SrO, and BaO) can adjust the optical constants of glass and optimize its chemical stability. However, high RO content can reduce the glass's resistance to devitrification. Therefore, the RO content is limited to 0-9%, preferably 0-4%, and more preferably 0-2%. In some embodiments, RO is preferably absent.

[0049] Alkali metal oxides (Rn2O) (Rn2O is one or more of Li2O, Na2O, and K2O) can lower the glass transition temperature, adjust the optical constants and high-temperature viscosity of the glass, and improve the glass's meltability. However, high Rn2O content can reduce the glass's devitrification resistance and chemical stability. Therefore, the Rn2O content in the present invention is 0-6%, preferably 0-4%, and more preferably 0-1%. In some embodiments, Rn2O is preferably absent.

[0050] WO3 can increase the refractive index and mechanical strength of glass. If the WO3 content exceeds 6%, the thermal stability of the glass decreases and the resistance to devitrification decreases. Therefore, the WO3 content is 0-6%, preferably 0-4%, and more preferably 0.5-3%.

[0051] In some embodiments, controlling the ratio of WO3 to Y2O3 (WO3 / Y2O3) to below 0.8 helps improve the chemical stability and devitrification resistance of the glass. Therefore, WO3 / Y2O3 is preferably below 0.8, and more preferably below 0.6. Furthermore, controlling the WO3 / Y2O3 ratio to within the range of 0.02 to 0.5 can further optimize the hardness and blistering of the glass. Therefore, WO3 / Y2O3 is more preferably between 0.02 and 0.5, and even more preferably between 0.05 and 0.3.

[0052] In some embodiments, controlling the ratio of TiO2 to the total content of Nb2O5 and WO3 (Nb2O5+WO3) (TiO2 / (Nb2O5+WO3)) within the range of 0.3 to 3.0 can reduce the density of the glass while preventing a decrease in the light transmittance of the glass. Therefore, preferably, TiO2 / (Nb2O5+WO3) is 0.3 to 3.0, and more preferably, TiO2 / (Nb2O5+WO3) is 0.4 to 2.0. Furthermore, controlling TiO2 / (Nb2O5+WO3) within the range of 0.6 to 1.5 can further optimize the Young's modulus and weather resistance of the glass. Therefore, more preferably, TiO2 / (Nb2O5+WO3) is 0.6 to 1.5, and even more preferably, TiO2 / (Nb2O5+WO3) is 0.8 to 1.3.

[0053] ZnO can adjust the refractive index and dispersion of glass, lowering its high-temperature viscosity and transition temperature. Excessive ZnO content increases glass molding difficulty and deteriorates its anti-devitrification properties. Therefore, the ZnO content is 0-8%, preferably 0-4%, and more preferably 0-2%. In some embodiments, ZnO is preferably absent.

[0054] In some embodiments, controlling the ratio of ZnO content to the combined content of SiO2 and B2O3 (SiO2 + B2O3) (ZnO / (SiO2 + B2O3)) to below 0.5 can improve the meltability of the glass, increase the bubble content, and optimize the abrasiveness. Therefore, ZnO / (SiO2 + B2O3) is preferably below 0.5, more preferably below 0.3, further preferably below 0.2, and even more preferably below 0.1.

[0055] In some embodiments, the ratio of the total content of B2O3 and TiO2 (B2O3+TiO2) to the total content of SiO2 and ZnO (SiO2+ZnO) (B2O3+TiO2) / (SiO2+ZnO) is controlled within a range of 1.0 to 10.0, which can improve the chemical stability of the glass and prevent the glass from decreasing in light transmittance. Therefore, preferably, (B2O3+TiO2) / (SiO2+ZnO) is 1.0 to 10.0, and more preferably, (B2O3+TiO2) / (SiO2+ZnO) is 1.0 to 8.0. Furthermore, by controlling (B2O3+TiO2) / (SiO2+ZnO) within a range of 1.5 to 7.0, the hardness of the glass can be further increased and the thermal expansion coefficient of the glass can be reduced. Therefore, it is more preferred that (B2O3+TiO2) / (SiO2+ZnO) is 1.5 to 7.0, and it is further preferred that (B2O3+TiO2) / (SiO2+ZnO) is 2.0 to 5.0.

[0056] In some embodiments, by controlling the ratio of the total content of Gd2O3 and ZnO Gd2O3 + ZnO to the content of Y2O3 (Gd2O3 + ZnO) / Y2O3) to be below 1.0, the thermal expansion coefficient of the glass can be reduced and the abrasiveness of the glass can be optimized. Therefore, it is preferred that (Gd2O3 + ZnO) / Y2O3 is below 1.0, and more preferably (Gd2O3 + ZnO) / Y2O3 is below 0.6. Furthermore, controlling (Gd2O3 + ZnO) / Y2O3 to be below 0.3 can make it easier for the glass to obtain a suitable Young's modulus and prevent the glass hardness from decreasing. Therefore, it is further preferred that (Gd2O3 + ZnO) / Y2O3 is below 0.3, and it is even more preferred that (Gd2O3 + ZnO) / Y2O3 is below 0.1.

[0057] Ta2O5 increases the refractive index and improves the glass's resistance to devitrification. However, excessive Ta2O5 content can reduce the glass's thermal stability and increase its density. Furthermore, Ta2O5 is very expensive compared to other components, so its use should be minimized for practical and cost reasons. Therefore, the Ta2O5 content in the present invention is limited to 0-8%, preferably 0-4%, and more preferably 0-2%. In some embodiments, it is further preferred that Ta2O5 be absent.

[0058] In some embodiments, the ratio of the combined content of Ta2O5 and Gd2O3 (Ta2O5 + Gd2O3) to the content of Y2O3 ((Ta2O5 + Gd2O3) / Y2O3)) is controlled to be below 1.0, which is beneficial for obtaining suitable abrasiveness of the glass, optimizing the density and Young's modulus of the glass, and preventing deterioration of the chemical stability of the glass. Therefore, (Ta2O5 + Gd2O3) / Y2O3 is preferably below 1.0, more preferably (Ta2O5 + Gd2O3) / Y2O3 is below 0.6, further preferably (Ta2O5 + Gd2O3) / Y2O3 is below 0.4, and even more preferably (Ta2O5 + Gd2O3) / Y2O3 is below 0.1.

[0059] Al2O3 can improve the chemical stability of glass, but when its content exceeds 5%, the glass's meltability and light transmittance deteriorate. Therefore, in the present invention, the Al2O3 content is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that Al2O3 is not contained.

[0060] GeO2 increases the refractive index and resistance to devitrification, but excessive GeO2 content can reduce the chemical stability of glass. Furthermore, GeO2 is very expensive compared to other components, so its use should be minimized for practical and cost reasons. Therefore, the GeO2 content in the present invention is limited to 0-5%, preferably 0-3%, more preferably 0-1%, and even more preferably, no GeO2 is present.

[0061] The present invention includes 0-2% of one or more of Sb2O3, SnO, SnO2, and CeO2 as clarifiers to enhance the clarification and foaming properties of the glass. The preferred clarifier content is 0-1%, and more preferably 0-0.5%. Due to the rational design of the component types and contents of the optical glass of the present invention, its foaming properties are excellent. Therefore, in some embodiments, it is further preferred that no clarifier be included. When the Sb2O3 content exceeds 2%, the glass tends to have reduced clarification properties. Furthermore, its strong oxidizing effect promotes corrosion of the platinum or platinum alloy vessel used to melt the glass and deteriorates the forming mold. Therefore, the present invention preferably includes 0-2% Sb2O3, more preferably 0-1%, even more preferably 0-0.5%, and even more preferably no Sb2O3. SnO and SnO2 can also serve as clarifiers, but when their content exceeds 2%, the glass tends to color. Furthermore, when the glass is heated, softened, and then re-molded by molding, Sn can serve as a starting point for crystal nucleation, leading to devitrification. Therefore, the content of SnO2 in the present invention is preferably 0-2%, more preferably 0-1%, further preferably 0-0.5%, and further preferably no SnO2 is contained; the content of SnO is preferably 0-2%, more preferably 0-1%, further preferably 0-0.5%, and further preferably no SnO is contained. The role and content ratio of CeO2 are the same as those of SnO2, and its content is preferably 0-2%, more preferably 0-1%, further preferably 0-0.5%, and further preferably no CeO2 is contained.

[0062] In some embodiments, in order to make the optical glass of the present invention obtain a lower thermal expansion coefficient and density, a higher light transmittance and bubble degree level, as well as an appropriate abrasion resistance and Young's modulus, the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 is preferably 88% or more, more preferably the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 is 90% or more, further preferably the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 is 92% or more, and even more preferably the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5, and TiO2 is 95% or more.

[0063] <Components that should not be contained>

[0064] In the glass of the present invention, even if oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo are contained alone or in combination in small amounts, the glass will be colored and absorb specific wavelengths in the visible light region, thereby weakening the property of the present invention of improving visible light transmittance. Therefore, it is preferably substantially free of such oxides, especially in optical glasses requiring transmittance at wavelengths in the visible light region.

[0065] Oxides of Th, Cd, Tl, Os, Be, and Se have been increasingly regulated as hazardous chemicals in recent years, necessitating environmental protection measures not only during glass manufacturing but also during processing and post-product disposal. Therefore, given the importance of environmental impact, it is preferable to virtually eliminate these oxides, except where they are unavoidably incorporated. This results in optical glass being virtually free of environmentally polluting substances. Therefore, even without adopting specific environmental countermeasures, the optical glass of the present invention can be manufactured, processed, and disposed of.

[0066] In order to achieve environmental friendliness, the optical glass of the present invention preferably does not contain As2O3 and PbO.

[0067] The "does not contain" and "0%" recorded herein means that the compound, molecule or element is not intentionally added as a raw material to the optical glass of the present invention; however, as raw materials and / or equipment for producing optical glass, there may be certain impurities or components that are not intentionally added, which may be contained in small amounts or trace amounts in the final optical glass. This situation is also within the scope of protection of the patent of this invention.

[0068] Next, the properties of the optical glass of the present invention will be described.

[0069] <Refractive Index and Abbe Number>

[0070] The refractive index of optical glass (n d ) and Abbe number (ν d ) Tested in accordance with the method specified in GB / T 7962.1-2010.

[0071] In some embodiments, the refractive index (n d ) is 1.92, preferably 1.93, and more preferably 1.94.

[0072] In some embodiments, the refractive index (n d ) is 1.98, preferably 1.97, and more preferably 1.96.

[0073] In some embodiments, the Abbe number (ν d ) is 29, preferably 30, and more preferably 31.

[0074] In some embodiments, the Abbe number (ν d ) is 36, preferably 35, and more preferably 34.

[0075] <density>

[0076] The density (ρ) of optical glass is tested according to the method specified in GB / T7962.20-2010.

[0077] In some embodiments, the density (ρ) of the optical glass of the present invention is 5.10 g / cm 3 Below, preferably 5.00 g / cm 3 Below, more preferably 4.95g / cm 3 the following.

[0078] <Coefficient of Thermal Expansion>

[0079] Thermal expansion coefficient of optical glass (α -30 / 70℃ ) The data at -30~70℃ was tested according to the method specified in GB / T7962.16-2010.

[0080] In some embodiments, the thermal expansion coefficient (α -30 / 70℃ ) is 85×10 -7 / K or less, preferably 80×10 -7 / K or less, more preferably 75×10 -7 / K or less, more preferably 70×10 -7 / K or less.

[0081] <Water resistance stability>

[0082] Water resistance stability of optical glass (D W ) (Powder method) Tested in accordance with the method specified in GB / T 17129.

[0083] In some embodiments, the water resistance stability (D W ) is 2 or more types, preferably 1 type.

[0084] <Acid resistance stability>

[0085] Acid resistance stability of optical glass (D A ) (Powder method) Tested in accordance with the method specified in GB / T 17129.

[0086] In some embodiments, the acid resistance stability (D A ) is 2 or more types, preferably 1 type.

[0087] <Color>

[0088] The short-wave transmission spectrum characteristics of the glass of the present invention are expressed by the coloration (λ 70 and λ5). 70 Refers to the wavelength when the glass transmittance reaches 70%. 70 The measurement is to use a glass with a thickness of 10±0.1mm and two parallel and optically polished opposite surfaces, and measure the spectral transmittance in the wavelength range from 280nm to 700nm and the wavelength at which the transmittance is 70%. The so-called spectral transmittance or transmittance is the wavelength at which the incident intensity I is perpendicular to the above surface of the glass. in Light of intensity I passes through the glass and emerges from a plane out The light of the case through I out / I in The amount expressed by λ also includes the transmittance of the glass due to surface reflection losses on the surface above. The higher the refractive index of the glass, the greater the surface reflection losses. Therefore, in high refractive index glass, λ 70 A small value of means that the glass itself is less colored and the light transmittance is high.

[0089] In some embodiments, the λ of the optical glass of the present invention is 70 425nm or less, preferably λ 70 420nm or less, more preferably λ 70 Below 415nm.

[0090] In some embodiments, the optical glass of the present invention has a λ5 of 375 nm or less, preferably 370 nm or less, and more preferably 365 nm or less.

[0091] Weather resistance

[0092] The weather resistance (CR) test method for optical glass is as follows: Place the sample in a test chamber with a saturated water vapor environment at a relative humidity of 90%, alternating between 40 and 50°C every hour for 15 cycles. The weather resistance category is determined based on the change in turbidity before and after the sample is placed. The weather resistance classification is shown in Table 1:

[0093] Table 1.

[0094]

[0095]

[0096] In some embodiments, the weather resistance (CR) of the optical glass of the present invention is Class 2 or higher, preferably Class 1.

[0097] <Knoop hardness>

[0098] Knoop hardness of optical glass (H K ) Test according to the test method specified in GB / T7962.18-2010.

[0099] In some embodiments, the Knoop hardness (H K ) is 650×10 7 Pa or more, preferably 660×10 7 Pa or more, more preferably 670×10 7 Pa or more, more preferably 680×10 7 Pa and above.

[0100] <Young's modulus>

[0101] Young's modulus (E) is calculated using the following formula using ultrasonic testing of its longitudinal wave velocity and shear wave velocity.

[0102]

[0103] G=V S 2 ρ

[0104] Where: E is Young's modulus, Pa;

[0105] G is the shear modulus, Pa;

[0106] V T is the shear wave velocity, m / s;

[0107] V S is the longitudinal wave velocity, m / s;

[0108] ρ is the density of glass, g / cm 3 .

[0109] In some embodiments, the lower limit of the Young's modulus (E) of the optical glass of the present invention is 11000×10 7 Pa, the preferred lower limit is 11500×10 7 Pa, and the more preferred lower limit is 12000×10 7 Pa, and the lower limit is more preferably 12500×10 7 Pa.

[0110] In some embodiments, the upper limit of the Young's modulus (E) of the optical glass of the present invention is 15000×10 7 Pa, the upper limit is preferably 14500×107 Pa, and the upper limit is more preferably 14000×10 7 Pa, and the upper limit is more preferably 13500×10 7 Pa.

[0111] <Bubble Degree>

[0112] The bubble degree of optical glass is tested according to the method specified in GB / T7962.8-2010.

[0113] In some embodiments, the bubble degree of the optical glass of the present invention is above grade A, preferably above grade A0, and more preferably above grade A. 00 class.

[0114] <Abrasion>

[0115] Abrasiveness of optical glass (F A ) refers to the value obtained by multiplying the ratio of the wear volume of the sample to the wear volume (volume) of the standard sample (H-K9 glass) under exactly the same conditions by 100, and is expressed as follows:

[0116] F A =V / V0×100=(W / ρ) / (W0 / ρ0)×100

[0117] Where: V—volume wear of the sample being tested;

[0118] V0—volume wear of standard sample;

[0119] W—mass wear loss of the sample being tested;

[0120] W0—mass wear of standard sample;

[0121] ρ—density of the sample being measured;

[0122] ρ0—density of standard sample.

[0123] In some embodiments, the abrasiveness (F A ) is 80, preferably 90, and more preferably 95.

[0124] In some embodiments, the abrasiveness (F A ) has an upper limit of 130, a preferred upper limit of 120, and a more preferred upper limit of 115.

[0125] [Method for manufacturing optical glass]

[0126] The optical glass of the present invention is produced using conventional raw materials and processes, including but not limited to oxides, hydroxides, complex salts (such as carbonates, nitrates, sulfates, etc.), boric acid, etc., and after being prepared according to conventional methods, the prepared charge is placed in a melting furnace (such as a platinum or platinum alloy crucible) at 1200-1450°C for melting. After clarification and homogenization, a homogeneous molten glass free of bubbles and undissolved matter is obtained. The molten glass is then cast in a mold and annealed. Those skilled in the art can appropriately select the raw materials, process methods, and process parameters according to actual needs.

[0127] [Glass preforms and optical components]

[0128] A glass preform can be produced from the produced optical glass using methods such as direct drop molding, grinding, or compression molding such as hot pressing. Specifically, the molten optical glass can be directly drop molded into a precision glass preform, or the glass preform can be produced through mechanical processing such as grinding and lapping. Alternatively, the glass preform can be produced by forming a preform for compression molding from the optical glass, hot pressing the preform, and then grinding the preform. It should be noted that the methods for producing the glass preform are not limited to the methods described above.

[0129] As described above, the optical glass of the present invention is useful for various optical elements and optical designs. It is particularly preferred to form a preform from the optical glass of the present invention and use the preform to perform re-hot pressing, precision stamping, etc. to produce optical elements such as lenses and prisms.

[0130] The glass preform and optical element of the present invention are both formed from the optical glass of the present invention. The glass preform and optical element of the present invention possess the excellent properties of optical glass, and they can provide various optical elements such as lenses and prisms with high optical value.

[0131] Examples of the lens include various lenses having spherical or aspherical lens surfaces, such as a concave meniscus lens, a convex meniscus lens, a biconvex lens, a biconcave lens, a plano-convex lens, and a plano-concave lens.

[0132] [Optical Instruments]

[0133] The optical elements formed by the optical glass of the present invention can be used to manufacture optical instruments such as photographic equipment, video equipment, projection equipment, display equipment, vehicle-mounted equipment and monitoring equipment.

[0134] Example

[0135] <Optical Glass Example>

[0136] In order to further clearly illustrate and describe the technical solutions of the present invention, the following non-limiting examples are provided.

[0137] This embodiment uses the above-mentioned optical glass manufacturing method to obtain optical glasses having the compositions shown in Tables 2 to 4. In addition, the properties of each glass were measured using the testing method described in the present invention, and the measurement results are shown in Tables 2 to 4.

[0138] Table 2.

[0139]

[0140]

[0141]

[0142] Table 3.

[0143]

[0144]

[0145] Table 4.

[0146]

[0147]

[0148]

[0149] <Glass Preform Example>

[0150] The glass obtained from optical glass examples 1 to 24# is used to make preforms of various lenses, prisms, etc., such as concave meniscus lenses, convex meniscus lenses, double convex lenses, double concave lenses, plano-convex lenses, and plano-concave lenses, by means of, for example, grinding processing, or molding methods such as re-hot pressing, precision stamping, etc.

[0151] <Optical Element Example>

[0152] The preforms obtained from the above-mentioned glass preform embodiments are annealed to reduce the internal stress of the glass and fine-tune the refractive index so that the optical properties such as the refractive index reach the desired values.

[0153] Each preform is then ground and polished to produce various lenses and prisms, including concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. The surfaces of the resulting optical elements can also be coated with an anti-reflection film.

[0154] <Optical Instrument Example>

[0155] The optical elements made from the above-mentioned optical element embodiments are optically designed and formed into optical components or optical assemblies using one or more optical elements, which can be used in, for example, imaging equipment, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / lighting in the automotive field, photolithography technology, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips.

Claims

1. Optical glass, characterized in that The components, expressed in weight percentage, contain: SiO2: 1-12%; B2O3: 5-18%; La2O3: 40-60%; Y2O3: 4-20%; ZrO2: 1-12%; Nb2O5: 4-20%; TiO2: 4-18%, (B2O3+TiO2) / (SiO2+ZnO) is 1.0-3.666, TiO2 / Y2O3 is 0.75-1.5, TiO2 / (Nb2O5+WO3) is 0.8-1.002, (Gd2O3+ZnO) / Y2O3 is less than 0.1, Y2O3 / B2O3 is 0.5-1.2, and the refractive index n of the optical glass is 1.0-3.666, TiO2 / Y2O3 is 0.75-1.5, TiO2 / (Nb2O5+WO3) is 0.8-1.002, (Gd2O3+ZnO) / Y2O3 is less than 0.1, and Y2O3 / B2O3 is 0.5-1.

2. d is 1.94~1.96, λ 70 Below 420nm.

2. The optical glass according to claim 1, wherein Its components, expressed in weight percentage, further contain: Gd2O3: 0-9%; and / or Ta2O5: 0-8%; and / or RO: 0-9%; and / or Rn2O: 0-6%; and / or WO3: 0-6%; and / or ZnO: 0-8%; and / or Al2O3: 0-5%; and / or Yb2O3: 0-10%; and / or GeO2: 0-5%; and / or clarifier: 0-2%, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO, SnO2, and CeO2.

3. Optical glass, characterized in that Its components, expressed in weight percentage, are SiO2: 1-12%; B2O3: 5-18%; La2O3: 40-60%; Y2O3: 4-20%; ZrO2: 1-12%; Nb2O5: 4-20%; TiO2: 4-18%; Gd2O3: 0-9%; Ta2O5: 0-8%; RO: 0~9%; Rn2O: 0~6%; WO3: 0~6%; ZnO: 0-8%; Al2O3: 0-5%; Yb2O3: 0-10%; GeO2: 0-5%; clarifier: 0-2%, (B2O3+TiO2) / (SiO2+ZnO) is 1.0-3.666, TiO2 / Y2O3 is 0.75-1.5, TiO2 / (Nb2O5+WO3) is 0.8-1.002, (Gd2O3+ZnO) / Y2O3 is less than 0.1, Y2O3 / B2O3 is 0.5-1.2, and the refractive index n of the optical glass is d is 1.94~1.96, λ 70 The particle size is below 420 nm, the RO is one or more of MgO, CaO, SrO, and BaO, the Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO, SnO2, and CeO2.

4. The optical glass according to any one of claims 1 to 3, characterized in that The components are expressed in weight percentage, wherein La2O3+Y2O3+Gd2O3 accounts for 46-70%.

5. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein La2O3+Y2O3+Gd2O3 accounts for 50-68%.

6. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein La2O3+Y2O3+Gd2O3 accounts for 55-65%.

7. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein SiO2+B2O3 accounts for 8-28%.

8. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein SiO2+B2O3 accounts for 10-25%.

9. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein SiO2+B2O3 accounts for 12-20%.

10. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein: (B2O3+TiO2) / (SiO2+ZnO) is 1.5 to 3.

666.

11. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein: (B2O3+TiO2) / (SiO2+ZnO) is 2.0-3.

666.

12. The optical glass according to any one of claims 1 to 3, characterized in that: Its components are expressed in weight percentage, wherein: (Ta2O5+Gd2O3) / Y2O3 is less than 1.

0.

13. The optical glass according to any one of claims 1 to 3, characterized in that: Its components are expressed in weight percentage, wherein: (Ta2O5+Gd2O3) / Y2O3 is less than 0.

6.

14. The optical glass according to any one of claims 1 to 3, characterized in that: Its components are expressed in weight percentage, wherein: (Ta2O5+Gd2O3) / Y2O3 is less than 0.

4.

15. The optical glass according to any one of claims 1 to 3, characterized in that: Its components are expressed in weight percentage, wherein: (Ta2O5+Gd2O3) / Y2O3 is less than 0.

1.

16. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein Y2O3 / B2O3 is 0.6-1.

2.

17. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein Y2O3 / B2O3 is 0.7-1.

2.

18. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein La2O3 / (TiO2+Nb2O5) is 1.2 to 6.

0.

19. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein La2O3 / (TiO2+Nb2O5) is 1.5 to 5.

0.

20. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein La2O3 / (TiO2+Nb2O5) is 2.0-4.

0.

21. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein La2O3 / (TiO2+Nb2O5) is 2.5-3.

5.

22. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein: ZnO / (SiO2+B2O3) is less than 0.

5.

23. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein: ZnO / (SiO2+B2O3) is less than 0.

3.

24. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein: ZnO / (SiO2+B2O3) is less than 0.

2.

25. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein: ZnO / (SiO2+B2O3) is less than 0.

1.

26. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein WO3 / Y2O3 is less than 0.

8.

27. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein WO3 / Y2O3 is less than 0.

6.

28. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein WO3 / Y2O3 is 0.02-0.

5.

29. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein WO3 / Y2O3 is 0.05-0.

3.

30. The optical glass according to any one of claims 1 to 3, characterized in that: The components are expressed in weight percentage, wherein: SiO2: 2-10%; and / or B2O3: 6-14%; and / or La2O3: 43-58%; and / or Y2O3: 5-15%; and / or ZrO2: 3-10%; and / or Nb2O5: 5-15%; and / or Ta2O5: 0-4%; and / or Gd2O3: 0-5%; and / or TiO2: 5-13%; and / or RO: 0-4%; and / or Rn2O: 0-4 %; and / or WO3: 0-4%; and / or ZnO: 0-4%; and / or Al2O3: 0-3%; and / or Yb2O3: 0-5%; and / or GeO2: 0-3%; and / or clarifier: 0-1%, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO, SnO2, and CeO2.

31. The optical glass according to any one of claims 1 to 3, characterized in that The components are expressed in weight percentage, wherein: SiO2: 4-9%; and / or B2O3: 7-12%; and / or La2O3: 46-53%; and / or Y2O3: 6-12%; and / or ZrO2: 4-9%; and / or Nb2O5: 7-12%; and / or Ta2O5: 0-2%; and / or Gd2O3: 0-3%; and / or TiO2: 6-12%; and / or RO: 0-2%; and / or Rn2O: 0-1%; and and / or WO3: 0.5-3%; and / or ZnO: 0-2%; and / or Al2O3: 0-1%; and / or Yb2O3: 0-1%; and / or GeO2: 0-1%; and / or clarifier: 0-0.5%, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO, SnO2, and CeO2.

32. The optical glass according to any one of claims 1 to 3, characterized in that The components are expressed in weight percentage, wherein: Gd2O3: 0-1%.

33. The optical glass according to any one of claims 1 to 3, characterized in that Its components are expressed in weight percentage, and the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5 and TiO2 is more than 88%.

34. The optical glass according to any one of claims 1 to 3, characterized in that Its components are expressed in weight percentage, and the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5 and TiO2 is more than 90%.

35. The optical glass according to any one of claims 1 to 3, characterized in that Its components are expressed in weight percentage, and the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5 and TiO2 is more than 92%.

36. The optical glass according to any one of claims 1 to 3, characterized in that Its components are expressed in weight percentage, and the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, Nb2O5 and TiO2 is more than 95%.

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

38. The optical glass according to any one of claims 1 to 3, characterized in that The Abbe number v of the optical glass d It is 29 to 36.

39. The optical glass according to any one of claims 1 to 3, characterized in that The Abbe number v of the optical glass d It is 30 to 35.

40. The optical glass according to any one of claims 1 to 3, characterized in that The Abbe number v of the optical glass d It is 31 to 34.

41. The optical glass according to any one of claims 1 to 3, characterized in that The density of the optical glass is 5.10 g / cm 3 Below; and / or thermal expansion coefficient α -30 / 70℃ 85×10 -7 / K or less; and / or water resistance stability D W Class 2 or above; and / or acid resistance stability D A More than 2 categories; and / or λ 70 415nm or less; and / or λ5 is 375nm or less; and / or weather resistance CR is 2 or more; and / or Knoop hardness H K 650×10 7 Pa or more; and / or Young's modulus E is 11000×10 7 Pa~15000×10 7 Pa; and / or bubble degree is above grade A; and / or abrasion degree is F A It is 80 to 130.

42. The optical glass according to any one of claims 1 to 3, characterized in that The density of the optical glass is 5.00 g / cm 3 Below; and / or thermal expansion coefficient α -30 / 70℃ 80×10 -7 / K or less; and / or water resistance stability D W Class 1; and / or acid resistance stability D A Class 1; and / or λ5 is 370nm or less; and / or weather resistance CR is Class 1; and / or Knoop hardness H K 660×10 7 Pa or more; and / or Young's modulus E is 11500×10 7 Pa~14500×10 7 Pa; and / or bubble degree is A0 or above; and / or abrasion degree is F A It is 90 to 120.

43. The optical glass according to any one of claims 1 to 3, characterized in that The density of the optical glass is 4.95 g / cm 3 Below; and / or thermal expansion coefficient α -30 / 70℃ 75×10 -7 / K or less; and / or λ5 is 365nm or less; and / or Knoop hardness H K 670×10 7 Pa or more; and / or Young's modulus E is 12000×10 7 Pa~14000×10 7 Pa; and / or bubble degree is A 00 Grade; and / or wear degree F A It is 95 to 115.

44. The optical glass according to any one of claims 1 to 3, characterized in that The thermal expansion coefficient of the optical glass is α -30 / 70℃ 70×10 -7 / K or less; and / or Knoop hardness H K 680×10 7 Pa or more; and / or Young's modulus E is 12500×10 7 Pa~13500×10 7 Pa.

45. A glass preform, characterized in that Made of the optical glass described in any one of claims 1 to 44.

46. An optical element, characterized in that It is made of the optical glass according to any one of claims 1 to 44, or made of the glass preform according to claim 45.

47. An optical instrument, characterized in that Containing the optical glass according to any one of claims 1 to 44, and / or containing the optical element according to claim 46.

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