Optical glass, glass preform, optical element, and optical instrument

Abstract

Provided in the present invention is an optical glass, which comprises the following components in percentage by weight: 20-35% of P2O5, 37-55% of Nb2O5, 1-12% of TiO2, 4-19% of BaO, and 0.5-14% of Na2O. By means of a reasonable component design, the optical glass of the present invention contains no components that are harmful to the environment, e.g., PbO, also has a high refractive index and high chromatic dispersion properties, and can meet the requirements for use in a high-performance optical instrument.

Description

Optical glass, glass preforms, optical components and optical instruments Technical Field

[0001] The present invention relates to optical glass, in particular to optical glass with a refractive index of 1.82-1.89 and an Abbe number of 18-26, and a glass preform, an optical element and an optical instrument made of the same. Background Art

[0002] In recent years, the digitization of optical instruments and the advancement of high-definition images and videos have been rapidly developing. This high-definition image and video is particularly prominent in optical instruments such as digital cameras, camcorders, and projectors. Simultaneously, the optical systems within these instruments are being designed to reduce the number of optical components, such as lenses and prisms, in order to achieve lightweighting and miniaturization. At the same radius of curvature, glass with a higher refractive index provides a wider imaging field of view, which facilitates reducing the number of optical components in an optical instrument. With the trend toward miniaturization of optical instruments, demand for high-refractive-index, high-dispersion optical glass with a refractive index of 1.82 to 1.89 and an Abbe number of 18 to 26 is growing.

[0003] Chinese patents CN1186279C and CN1229293C each disclose a high-refractive-index, high-dispersion optical glass. Both contain large amounts of PbO, which is harmful to the environment. Furthermore, the glass has a high density, which is not conducive to lightweighting. Chinese patents CN102471130A, CN101932532A, and CN101289275A each disclose a high-refractive-index, high-dispersion optical glass. These glasses each contain large amounts of SiO2, and their solubility needs to be improved.

[0004] Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an optical glass with a refractive index of 1.82 to 1.89 and an Abbe number of 18 to 26, which meets environmental protection requirements.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] The optical glass comprises, expressed in weight percentage, 20-35% of P2O5, 37-55% of Nb2O5, 1-12% of TiO2, 4-19% of BaO, and 0.5-14% of Na2O.

[0008] Furthermore, the optical glass, expressed in weight percentage, further contains: CaO: 0-8%; and / or MgO: 0-5%; and / or SrO: 0-8%; and / or ZnO: 0-5%; and / or Li2O: 0-5%; and / or K2O: 0-5%; and / or Ln2O3: 0-5%; and / or SiO2: 0-5%; and / or B2O3: 0-5%; and / or Al2O3: 0-3%; and / or WO3: 0-3%; and / or ZrO2: 0-5%; and / or Bi2O3: 0-3%; and / or clarifier: 0-1%, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

[0009] Optical glass, whose components are expressed in weight percentage, comprises P2O5: 20-35%; Nb2O5: 37-55%; TiO2: 1-12%; BaO: 4-19%; Na2O: 0.5-14%; CaO: 0-8%; MgO: 0-5%; SrO: 0-8%; ZnO: 0-5%; Li2O: 0-5%; K2O: 0-5%; Ln2O3: 0-5%; The invention relates to a novel nanostructured carbon ...

[0010] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is less than 2.0, preferably (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is less than 1.5, more preferably (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is less than 1.0, and further preferably (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is less than 0.5.

[0011] Furthermore, the optical glass, wherein: (Li2O+B2O3+Bi2O3) / TiO2 is less than 1.0, preferably (Li2O+B2O3+Bi2O3) / TiO2 is less than 0.8, more preferably (Li2O+B2O3+Bi2O3) / TiO2 is less than 0.5, and further preferably (Li2O+B2O3+Bi2O3) / TiO2 is less than 0.2.

[0012] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: SrO / TiO2 is 0.01 to 5.0, preferably SrO / TiO2 is 0.01 to 2.0, more preferably SrO / TiO2 is 0.05 to 1.0, and further preferably SrO / TiO2 is 0.1 to 0.7.

[0013] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: BaO / (Na2O+K2O+TiO2) is 0.4~5.0, preferably BaO / (Na2O+K2O+TiO2) is 0.5~3.0, more preferably BaO / (Na2O+K2O+TiO2) is 0.6~2.5, and further preferably BaO / (Na2O+K2O+TiO2) is 0.7~1.5.

[0014] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: Nb2O5 / P2O5 is 1.3-2.7, preferably Nb2O5 / P2O5 is 1.4-2.5, more preferably Nb2O5 / P2O5 is 1.5-2.2, and further preferably Nb2O5 / P2O5 is 1.6-2.0.

[0015] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (SiO2+CaO+ZnO) / SrO is 0.3~8.0, preferably (SiO2+CaO+ZnO) / SrO is 0.5~5.0, more preferably (SiO2+CaO+ZnO) / SrO is 0.6~3.0, and further preferably (SiO2+CaO+ZnO) / SrO is 0.7~2.0.

[0016] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (WO3+ZnO+K2O+CaO+MgO) / TiO2 is less than 2.0, preferably (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.05~1.5, more preferably (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.1~1.0, and further preferably (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.2~0.8.

[0017] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.03~0.4, preferably (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.04~0.3, more preferably (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.05~0.25, and further preferably (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.06~0.15.

[0018] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: Na2O / BaO is 0.05-2.0, preferably Na2O / BaO is 0.1-1.5, more preferably Na2O / BaO is 0.2-1.0, and further preferably Na2O / BaO is 0.4-0.9.

[0019] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: BaO / P2O5 is 0.15-0.9, preferably BaO / P2O5 is 0.25-0.8, more preferably BaO / P2O5 is 0.3-0.7, and further preferably BaO / P2O5 is 0.35-0.6.

[0020] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (Li2O+B2O3+TiO2) / BaO is 0.06~2.0, preferably (Li2O+B2O3+TiO2) / BaO is 0.07~1.5, more preferably (Li2O+B2O3+TiO2) / BaO is 0.08~1.0, and further preferably (Li2O+B2O3+TiO2) / BaO is 0.1~0.5.

[0021] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: TiO2 / CaO is 0.4-10.0, preferably TiO2 / CaO is 0.8-8.0, more preferably TiO2 / CaO is 1.0-6.0, and further preferably TiO2 / CaO is 1.2-5.0.

[0022] Furthermore, the optical glass, wherein the components are expressed in weight percentage, wherein: P2O5: 22-32%, preferably P2O5: 25-30%; and / or Nb2O5: 41-52%, preferably Nb2O5: 43-50%; and / or TiO2: 2-10%, preferably TiO2: 3-7%; and / or BaO: 6-16.5%, preferably BaO: 10-15%; and / or Na2O: 2-12%, preferably Na2O: 5-10%; and / or CaO: greater than 0 but less than or equal to 6%, preferably CaO: 1-4%; and / or MgO: 0-3%, preferably MgO: 0-1%; and / or SrO: greater than 0 but less than or equal to 5%, preferably SrO: 0.5-3%; and / or ZnO: 0-3%, preferably ZnO: 0-1%; and / or Li2O: 0-3%, preferably Li2O: 0-1%; and / or K2O: 0-3%, preferably K2O: 0-1%; and / or Ln2O3: 0-3%, preferably Ln2O3: 0-1%; and / or SiO2: 0-3%, preferably SiO2: 0-1%; and / or B2O3: 0-3%, preferably B2O3: 0-1%; and / or Al2O3: 0-2%, preferably Al2O3: 0-1%; and / or WO3: 0-2%, preferably WO3: 0-1%; and / or ZrO2: 0-2%, preferably ZrO2: 0-1%; and / or Bi2O3: 0-2%, preferably Bi2O3: 0-1%; and / or clarifier: 0-0.5%, preferably clarifier: 0-0.1%, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

[0023] Furthermore, the optical glass does not contain MgO, and / or does not contain ZnO, and / or does not contain Li2O, and / or does not contain K2O, and / or does not contain Ln2O3, and / or does not contain B2O3, and / or does not contain Al2O3, and / or does not contain WO3, and / or does not contain ZrO2, and / or does not contain Bi2O3, and / or does not contain clarifiers, and the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

[0024] Furthermore, the refractive index n of the optical glass is d 1.82 to 1.89, preferably 1.83 to 1.88, more preferably 1.84 to 1.87; Abbe number ν d It is 18-26, preferably 20-25, and more preferably 21-24.

[0025] Furthermore, the thermal expansion coefficient α of the optical glass 100 / 300℃ 100×10 -7 / K or less, preferably 95×10 -7 / K or less, more preferably 90×10 -7 / K or less; and / or acid resistance stability D A 2 or more, preferably 1; and / or water resistance stability D W More than 2 types, preferably 1 type; and / or relative partial dispersion P g,F 0.58 to 0.72, preferably 0.60 to 0.68, more preferably 0.62 to 0.65; and / or relative partial dispersion deviation value ΔP g,F is 0.08 or less, preferably 0.005 to 0.06, more preferably 0.01 to 0.04; and / or transition temperature T g 670°C or less, preferably 660°C or less, more preferably 650°C or less; and / or wear degree F A 250 to 290, preferably 260 to 285, more preferably 265 to 280; and / or density ρ is 4.00 g / cm 3 Below, preferably 3.90g / cm 3 Below, more preferably 3.80g / cm 3 Below; and / or 70 430nm or less, preferably λ 70 420nm or less, more preferably λ 70 410nm or less; and / or λ5 is 400nm or less, preferably λ5 is 390nm or less, more preferably λ5 is 380nm or less; and / or weather resistance CR is 2 or more, preferably 1; and / or Young's modulus E is 8000×10 7 Pa or more, preferably 8500×10 7 Pa or more, more preferably 9000×10 7 Pa or more; and / or the bubble degree is A grade or more, preferably A0 grade or more, more preferably A 00 class.

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

[0027] The optical element is made of the above optical glass, or made of the above glass preform.

[0028] An optical instrument containing the above-mentioned optical glass or the above-mentioned optical element.

[0029] The beneficial effects of the present invention are: through reasonable component design, the optical glass of the present invention does not contain components harmful to the environment such as PbO, and at the same time has high refractive and high dispersion properties, meeting the requirements for use in high-performance optical instruments. DETAILED DESCRIPTION

[0030] 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."

[0031] [Optical glass]

[0032] 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%.

[0033] 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.

[0034] <Essential Components and Optional Components>

[0035] Phosphate (P2O5) is a network former in the glass of the present invention. Compared to silicate glass, phosphate glass can melt at lower temperatures, which helps improve the glass's light transmittance. If the P2O5 content is too high, the glass will have difficulty achieving a high refractive index. Therefore, the P2O5 content in the present invention is 20-35%, preferably 22-32%, and more preferably 25-30%.

[0036] Nb2O5 is a high refractive and high dispersion component that can increase the refractive index and devitrification resistance of glass and has the effect of reducing the relative partial dispersion (P g,F ) and relative partial dispersion deviation (ΔP g,F) effect, the present invention achieves this effect by containing at least 37% Nb2O5. The preferred lower limit for the Nb2O5 content is 41%, and more preferably 43%. If the Nb2O5 content exceeds 55%, the thermal and chemical stability of the glass decreases, and the light transmittance falls. Therefore, the upper limit for the Nb2O5 content in the present invention is 55%, preferably 52%, and more preferably 50%.

[0037] In some embodiments, the ratio of Nb2O5 to P2O5 is controlled within the range of 1.3 to 2.7, which can improve the anti-crystallization performance and chemical stability of the glass, optimize the Young's modulus of the glass, and more easily obtain the desired P g,F Value and ΔP g,F Therefore, Nb2O5 / P2O5 is preferably 1.3 to 2.7, more preferably 1.4 to 2.5, further preferably 1.5 to 2.2, and still further preferably 1.6 to 2.0.

[0038] TiO2 has high refractive index and high dispersion properties, which can improve the chemical stability of glass and adjust the relative partial dispersion of glass (P g,F ) and relative partial dispersion deviation (ΔP g,F ), if its content is too high, the glass's resistance to devitrification and light transmittance are reduced. Therefore, the content of TiO2 is 1 to 12%, preferably 2 to 10%, and more preferably 3 to 7%.

[0039] BaO improves the devitrification resistance and hardness of glass and reduces its temperature coefficient of refractive index and thermal expansion coefficient. In the present invention, these effects are achieved by containing 4% or more BaO. Preferably, the BaO content is 6% or more, and more preferably, 10% or more. On the other hand, by limiting the BaO content to 19% or less, the reduction in chemical stability caused by excessive BaO content can be prevented. Therefore, the BaO content is 19% or less, preferably 16.5% or less, and more preferably 15% or less.

[0040] In some embodiments, controlling the ratio of BaO to P2O5 (BaO / P2O5) within a range of 0.15 to 0.9 can improve the weather resistance and light transmittance of the glass and optimize the abrasiveness of the glass. Therefore, the BaO / P2O5 ratio is preferably 0.15 to 0.9, more preferably 0.25 to 0.8, further preferably 0.3 to 0.7, and even more preferably 0.35 to 0.6.

[0041] CaO helps adjust the optical constants of glass and improve its processing properties and weather resistance. However, excessive CaO content can deteriorate the glass's anti-devitrification properties. Therefore, the CaO content is 0-8%, preferably greater than 0 but less than or equal to 6%, and more preferably 1-4%.

[0042] In some embodiments, controlling the ratio of TiO2 to CaO (TiO2 / CaO) within a range of 0.4 to 10.0 is beneficial for reducing the thermal expansion coefficient of the glass and optimizing the Young's modulus and abrasiveness of the glass. Therefore, the TiO2 / CaO ratio is preferably 0.4 to 10.0, more preferably 0.8 to 8.0, further preferably 1.0 to 6.0, and even more preferably 1.2 to 5.0.

[0043] SrO can adjust the refractive index and dispersion of glass, but excessive SrO content reduces the chemical stability of the glass and increases its cost. Therefore, the SrO content is 0-8%, preferably greater than 0 but less than or equal to 5%, and more preferably 0.5-3%.

[0044] In some embodiments, the ratio of SrO to TiO2 is controlled within the range of 0.01 to 5.0, which is beneficial for the glass to have a desired P g,F Value and ΔP g,F Therefore, the SrO / TiO2 ratio is preferably 0.01 to 5.0, more preferably 0.01 to 2.0, further preferably 0.05 to 1.0, and even more preferably 0.1 to 0.7.

[0045] MgO helps reduce the density and melting temperature of glass. However, excessive MgO content makes it difficult for the glass's refractive index to meet design requirements, and the glass's anti-vitrification performance and stability are reduced. Therefore, the MgO content is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, MgO is preferably absent.

[0046] ZnO can lower the glass transition temperature and melting point, improve the chemical stability of glass, and reduce its high-temperature viscosity. However, if the ZnO content is too high, the glass's anti-vitrification properties will deteriorate, and devitrification may occur due to low viscosity. Therefore, the ZnO content in the present invention is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, ZnO is preferably absent.

[0047] Li2O can improve the meltability of glass and lower its transition temperature. However, if its content is too high, the refractive index of the glass will not meet the design requirements, and the chemical stability of the glass will deteriorate. Therefore, the content of Li2O in the present invention is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that Li2O be absent.

[0048] Na2O can improve the meltability and formability of glass and optimize the light transmittance of glass. However, if its content is too high, it will be detrimental to the thermal expansion coefficient and chemical stability of the glass. Therefore, the Na2O content is 0.5-14%, preferably 2-12%, and more preferably 5-10%.

[0049] In some embodiments, controlling the ratio of Na2O to BaO (Na2O / BaO) within a range of 0.05 to 2.0 is beneficial for increasing the bubble content of the glass, optimizing the abrasiveness of the glass, and preventing an increase in the thermal expansion coefficient. Therefore, the Na2O / BaO ratio is preferably 0.05 to 2.0, more preferably 0.1 to 1.5, further preferably 0.2 to 1.0, and even more preferably 0.4 to 0.9.

[0050] K2O improves the thermal stability and meltability of glass, but excessive K2O content reduces the glass's resistance to devitrification. Therefore, the K2O content is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that K2O be absent.

[0051] In some embodiments, the ratio of BaO content to the total content of Na2O, K2O and TiO2 (Na2O+K2O+TiO2) is controlled within the range of 0.4 to 5.0, and the glass can more easily obtain the desired P g,F Value and ΔP g,F The value is adjusted to prevent the density of the glass from increasing. Therefore, the BaO / (Na2O+K2O+TiO2) is preferably 0.4-5.0, and the BaO / (Na2O+K2O+TiO2) is more preferably 0.5-3.0. Furthermore, controlling the BaO / (Na2O+K2O+TiO2) within the range of 0.6-2.5 can further optimize the abrasiveness and bubble content of the glass. Therefore, the BaO / (Na2O+K2O+TiO2) is more preferably 0.6-2.5, and even more preferably 0.7-1.5.

[0052] Ln2O3 (Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3) is a component that increases the refractive index of glass and is an optional component in the optical glass of the present invention. By controlling the Ln2O3 content to 5% or less, a decrease in the glass's devitrification resistance can be prevented. Therefore, in the present invention, the Ln2O3 content is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, Ln2O3 is further preferably absent.

[0053] The inclusion of SiO2 in phosphate glass can make the glass network more compact, improving the chemical stability and mechanical strength of the glass. However, the phosphate glass network is not very compatible with SiO2, and phase separation and precipitation are easily caused when the SiO2 content is too high. Therefore, the SiO2 content in the present invention is 0-5%, preferably 0-3%, and more preferably 0-1%.

[0054] In some embodiments, controlling the ratio of the total content of SiO2, CaO, and ZnO (SiO2+CaO+ZnO) to the content of SrO ((SiO2+CaO+ZnO) / SrO)) within a range of 0.3 to 8.0 is beneficial for reducing the thermal expansion coefficient and density of the glass and optimizing the weather resistance of the glass. Therefore, (SiO2+CaO+ZnO) / SrO is preferably 0.3 to 8.0, more preferably (SiO2+CaO+ZnO) / SrO is 0.5 to 5.0, further preferably (SiO2+CaO+ZnO) / SrO is 0.6 to 3.0, and even more preferably (SiO2+CaO+ZnO) / SrO is 0.7 to 2.0.

[0055] B2O3 improves the thermal stability and meltability of glass, but high B2O3 content reduces the chemical stability and devitrification resistance of the glass. Therefore, the B2O3 content in the present invention is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, B2O3 is preferably absent.

[0056] In some embodiments, the ratio of the total content of Li2O, B2O3 and TiO2 (Li2O+B2O3+TiO2) to the content of BaO (Li2O+B2O3+TiO2) / BaO is controlled within the range of 0.06 to 2.0, which can improve the weather resistance of the glass, prevent the transition temperature from increasing, and make it easier to obtain the desired P g,F Value and ΔP g,FTherefore, (Li2O+B2O3+TiO2) / BaO is preferably 0.06 to 2.0, more preferably (Li2O+B2O3+TiO2) / BaO is 0.07 to 1.5, further preferably (Li2O+B2O3+TiO2) / BaO is 0.08 to 1.0, and further preferably (Li2O+B2O3+TiO2) / BaO is 0.1 to 0.5.

[0057] Al2O3 can improve the chemical stability of glass, but when its content exceeds 3%, the glass's meltability and light transmittance deteriorate. Therefore, in the present invention, the Al2O3 content is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is further preferred that Al2O3 is not contained.

[0058] WO3 is an optional component that can adjust the optical constants and devitrification resistance of glass. However, high WO3 content reduces the transmittance and devitrification resistance of the glass. Therefore, the WO3 content is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, WO3 is preferably absent.

[0059] In some embodiments, the ratio of the total content of WO3, ZnO, K2O, CaO, and MgO (WO3+ZnO+K2O+CaO+MgO) to the content of TiO2 (WO3+ZnO+K2O+CaO+MgO) / TiO2 is controlled to be below 2.0, which can reduce the glass transition temperature while increasing the bubble degree of the glass and optimizing the abrasiveness of the glass. Therefore, (WO3+ZnO+K2O+CaO+MgO) / TiO2 is preferably below 2.0, more preferably (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.05-1.5, further preferably (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.1-1.0, and even more preferably (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.2-0.8.

[0060] In some embodiments, the ratio of the total content of WO3, K2O, TiO2, and B2O3 (WO3+K2O+TiO2+B2O3) to the content of Nb2O5 (WO3+K2O+TiO2+B2O3) / Nb2O5) is controlled within a range of 0.03 to 0.4, which can reduce the thermal expansion coefficient of the glass and improve the light transmittance and chemical stability of the glass. Therefore, (WO3+K2O+TiO2+B2O3) / Nb2O5 is preferably 0.03 to 0.4, more preferably (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.04 to 0.3, further preferably (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.05 to 0.25, and even more preferably (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.06 to 0.15.

[0061] A proper amount of ZrO2 can increase the mechanical strength and hardness of the glass, improve the anti-crystallization performance of the glass, and adjust the P g,F Value and ΔP g,F However, ZrO2 is difficult to dissolve in phosphate glass, and excessive ZrO2 content can lead to difficulties in sintering. Therefore, the content of ZrO2 in the present invention is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, ZrO2 is further preferably absent.

[0062] Bi2O3 can increase the refractive index of glass, but Bi2O3 has a high density, which is not conducive to lightweight glass design. Therefore, the content of Bi2O3 in the present invention is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is further preferred that Bi2O3 is not included.

[0063] In some embodiments, the ratio of the total content of ZnO, Li2O, K2O, WO3, B2O3 and Bi2O3 (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) to the content of SrO (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is controlled to below 2.0. This can improve the bubble degree of the glass while having a lower thermal expansion coefficient, optimize the Young's modulus, and prevent a decrease in light transmittance. Therefore, it is preferred that (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is less than 2.0, it is more preferred that (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is less than 1.5, it is further preferred that (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is less than 1.0, and it is further preferred that (ZnO+Li2O+K2O+WO3+B2O3+Bi2O3) / SrO is less than 0.5.

[0064] In some embodiments, the ratio of the total content of Li2O, B2O3 and Bi2O3 (Li2O+B2O3+Bi2O3) to the content of TiO2 (Li2O+B2O3+Bi2O3) / TiO2 is controlled to be below 1.0. This helps reduce the density of the glass while having a lower transition temperature, optimizes the chemical stability of the glass, and more easily achieves the desired P g,F Value and ΔP g,F Therefore, it is preferred that (Li2O+B2O3+Bi2O3) / TiO2 is 1.0 or less, more preferably (Li2O+B2O3+Bi2O3) / TiO2 is 0.8 or less, further preferably (Li2O+B2O3+Bi2O3) / TiO2 is 0.5 or less, and further preferably (Li2O+B2O3+Bi2O3) / TiO2 is 0.2 or less.

[0065] The present invention includes 0-1% of one or more of Sb2O3, SnO2, and CeO2 as a clarifier to enhance the clarification and foaming properties of the glass. The preferred clarifier content is 0-0.5%, and more preferably 0-0.1%. Due to the rational design of the component types and contents of the optical glass of the present invention, which results in excellent foaming properties, it is further preferred in some embodiments to exclude the inclusion of a clarifier. When the Sb2O3 content exceeds 1%, the clarification properties of the glass tend to decrease. Furthermore, its strong oxidizing effect promotes corrosion of the platinum or platinum alloy vessel used for melting the glass and deteriorates the forming mold. Therefore, the present invention preferably includes 0-1% Sb2O3, more preferably 0-0.5%, even more preferably 0-0.1%, and even more preferably excludes the inclusion of Sb2O3. SnO2 can also serve as a clarifier, but when its content exceeds 1%, 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 0-1%, more preferably 0-0.5%, further preferably 0-0.1%, and further preferably no SnO2 is contained. The role and content ratio of CeO2 are the same as those of SnO2, and its content is preferably 0-1%, more preferably 0-0.5%, further preferably 0-0.1%, and further preferably no CeO2 is contained.

[0066] <Components that should not be contained>

[0067] 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.

[0068] 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.

[0069] In order to achieve environmental friendliness, the optical glass of the present invention preferably does not contain As2O3 and PbO.

[0070] 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.

[0071] Next, the properties of the optical glass of the present invention will be described.

[0072] <Refractive Index and Abbe Number>

[0073] 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.

[0074] In some embodiments, the refractive index (n d ) is 1.82, preferably 1.83, and more preferably 1.84.

[0075] In some embodiments, the refractive index (n d ) is 1.89, preferably 1.88, and more preferably 1.87.

[0076] In some embodiments, the Abbe number (ν d) is 18, preferably 20, and more preferably 21.

[0077] In some embodiments, the Abbe number (ν d ) is 26, preferably 25, and more preferably 24.

[0078] <Coefficient of Thermal Expansion>

[0079] Thermal expansion coefficient of optical glass (α 100 / 300℃ ) The data at 100-300℃ were tested according to the method specified in GB / T7962.16-2010.

[0080] In some embodiments, the thermal expansion coefficient (α 100 / 300℃ ) is 100×10 -7 / K or less, preferably 95×10 -7 / K or less, more preferably 90×10 -7 / K or less.

[0081] <Acid resistance stability>

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

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

[0084] <Water resistance stability>

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

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

[0087] <Relative Partial Dispersion and Relative Partial Dispersion Deviation Value>

[0088] The relative partial dispersion (P g,F ) and relative partial dispersion deviation (ΔP g,F ) origin.

[0089] The relative partial dispersion for wavelengths x and y is expressed by the following equation (1): x,y =(n x -n y ) / (nF -n C ) (1)

[0090] According to the Abbe number formula, for most so-called "normal glasses" (H-K6 and F4 are selected as "normal glasses" below), the following formula (2) is valid: x,y =m x,y ·v d +b x,y (2)

[0091] This linear relationship is based on P x,y is the vertical coordinate, v d It is represented by the horizontal axis, where m x,y is the slope, b x,y is the intercept.

[0092] As is known to all, the correction of the secondary spectrum, i.e. the achromatization of more than two wavelengths, requires at least one glass that does not conform to the above formula (2) (i.e. its P x,y The deviation value deviates from Abbe's empirical formula), and its deviation value is expressed as ΔP x,y If it is expressed as, then each P x,y -v d The point is shifted by ΔP relative to the “normal line” that conforms to the above formula (2) x,y Quantity, so that the ΔP of each glass x,y The value can be calculated using the following formula (3): x,y =m x,y ·v d +b x,y +ΔP x,y (3)

[0093] Therefore, ΔP x,y It quantitatively expresses the deviation characteristics of special dispersion compared with "normal glass".

[0094] Therefore, the relative partial dispersion (P g,F ) and relative partial dispersion deviation (ΔP g,F ) is calculated as follows (4) and (5): g,F =(n g -n F ) / (n F -n C ) (4) ΔP g,F =P g,F-0.6457+0.001703v d (5)

[0095] In some embodiments, the relative partial dispersion (P g,F ) is 0.58 to 0.72, preferably 0.60 to 0.68, and more preferably 0.62 to 0.65.

[0096] In some embodiments, the relative partial dispersion deviation value (ΔP g,F ) is 0.08 or less, preferably 0.005 to 0.06, and more preferably 0.01 to 0.04.

[0097] <Transition Temperature>

[0098] Transition temperature of optical glass (T g ) Test according to the method specified in GB / T7962.16-2010.

[0099] In some embodiments, the transition temperature (T g ) is 670°C or lower, preferably 660°C or lower, more preferably 650°C or lower.

[0100] <Abrasion>

[0101] 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: F A =V / V0×100=(W / ρ) / (W0 / ρ0)×100

[0102] Where: V—volume wear of the sample being tested;

[0103] V0—volume wear of standard sample;

[0104] W—mass wear loss of the sample being tested;

[0105] W0—mass wear of standard sample;

[0106] ρ—density of the sample being measured;

[0107] ρ0—density of standard sample.

[0108] In some embodiments, the abrasiveness (F A ) is 250, preferably 260, and more preferably 265.

[0109] In some embodiments, the abrasiveness (F A ) is 290, preferably 285, and more preferably 280.

[0110] <density>

[0111] Density (ρ) is tested according to the method specified in GB / T7962.20-2010.

[0112] In some embodiments, the density (ρ) of the optical glass of the present invention is 4.00 g / cm 3 Below, preferably 3.90g / cm 3 Below, more preferably 3.80g / cm 3 the following.

[0113] <Color>

[0114] 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.

[0115] In some embodiments, the λ of the optical glass of the present invention is 70 430nm or less, preferably λ 70 420nm or less, more preferably λ 70 Below 410nm.

[0116] In some embodiments, the optical glass of the present invention has a λ5 of 400 nm or less, preferably λ5 of 390 nm or less, and more preferably λ5 of 380 nm or less.

[0117] Weather resistance

[0118] 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:

[0119] Table 1.

[0120] In some embodiments, the weather resistance (CR) of the optical glass of the present invention is Class 2 or higher, preferably Class 1.

[0121] <Young's modulus>

[0122] Young's modulus (E) is calculated using the following formula using ultrasonic testing of its longitudinal wave velocity and shear wave velocity. G=V S 2 ρ

[0123] Where: E is Young's modulus, Pa;

[0124] G is the shear modulus, Pa;

[0125] V T is the shear wave velocity, m / s;

[0126] V S is the longitudinal wave velocity, m / s;

[0127] ρ is the density of glass, g / cm 3 .

[0128] In some embodiments, the Young's modulus (E) of the optical glass of the present invention is 8000×10 7 Pa or more, preferably 8500×10 7 Pa or more, more preferably 9000×10 7 Pa or above.

[0129] <Bubble Degree>

[0130] The bubble degree of optical glass is tested according to the method specified in GB / T7962.8-2010.

[0131] 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.

[0132] [Method for manufacturing optical glass]

[0133] The manufacturing method of the optical glass of the present invention is as follows: The glass of the present invention is produced using conventional raw materials and processes, including but not limited to using oxides, hydroxides, complex salts (such as carbonates, nitrates, sulfates, phosphates, metaphosphates, etc.), boric acid, etc. as raw materials. After the materials are prepared according to conventional methods, the prepared furnace materials are placed in a melting furnace (such as a platinum or platinum alloy crucible) at 1050-1250°C, preferably 1100-1200°C, and melted. After clarification and homogenization, a homogeneous molten glass free of bubbles and undissolved matter is obtained. The molten glass is 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.

[0134] [Glass preforms and optical components]

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] [Optical Instruments]

[0140] 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.

[0141] Example

[0142] <Optical Glass Example>

[0143] In order to further clearly illustrate and describe the technical solutions of the present invention, the following non-limiting examples are provided.

[0144] 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.

[0145] Table 2.

[0146] Table 3.

[0147] Table 4.

[0148] <Glass Preform Example>

[0149] The glass obtained from optical glass examples 1 to 21# 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.

[0150] <Optical Element Example>

[0151] 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.

[0152] 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.

[0153] <Optical Instrument Example>

[0154] 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: Its components, expressed in weight percentage, include: P2O5: 20-35%; Nb2O5: 37-55%; TiO2: 1-12%; BaO: 4-19%; Na2O: 0.5-14%.

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

3. Optical glass, characterized in that: Its components, expressed in weight percentage, are P2O5: 20-35%; Nb2O5: 37-55%; TiO2: 1-12%; BaO: 4-19%; Na2O: 0.5-14%; CaO: 0-8%; MgO: 0-5%; SrO: 0-8%; The invention comprises the following components: ZnO: 0-5%; Li2O: 0-5%; K2O: 0-5%; Ln2O3: 0-5%; SiO2: 0-5%; B2O3: 0-5%; Al2O3: 0-3%; WO3: 0-3%; ZrO2: 0-5%; Bi2O3: 0-3%; and clarifier: 0-1%, wherein Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3 and Lu2O3, and the clarifier is one or more of Sb2O3, SnO2 and CeO2.

4. The optical glass according to any one of claims 1 to 3, characterized in that: Its components are expressed in weight percentage and meet one or more of the following 12 conditions: 1) (ZnO + Li2O + K2O + WO3 + B2O3 + Bi2O3) / SrO is less than 2.0, preferably (ZnO + Li2O + K2O + WO3 + B2O3 + Bi2O3) / SrO is less than 1.5, more preferably (ZnO + Li2O + K2O + WO3 + B2O3 + Bi2O3) / SrO is less than 1.0, and further preferably (ZnO + Li2O + K2O + WO3 + B2O3 + Bi2O3) / SrO is less than 0.5; 2) (Li2O+B2O3+Bi2O3) / TiO2 is less than 1.0, preferably (Li2O+B2O3+Bi2O3) / TiO2 is less than 0.8, more preferably (Li2O+B2O3+Bi2O3) / TiO2 is less than 0.5, and further preferably (Li2O+B2O3+Bi2O3) / TiO2 is less than 0.2; 3) SrO / TiO2 is 0.01 to 5.0, preferably SrO / TiO2 is 0.01 to 2.0, more preferably SrO / TiO2 is 0.05 to 1.0, and further preferably SrO / TiO2 is 0.1 to 0.7; 4) BaO / (Na2O+K2O+TiO2) is 0.4 to 5.0, preferably BaO / (Na2O+K2O+TiO2) is 0.5 to 3.0, more preferably BaO / (Na2O+K2O+TiO2) is 0.6 to 2.5, and further preferably BaO / (Na2O+K2O+TiO2) is 0.7 to 1.5; 5) Nb2O5 / P2O5 is 1.3 to 2.7, preferably Nb2O5 / P2O5 is 1.4 to 2.5, more preferably Nb2O5 / P2O5 is 1.5 to 2.2, and further preferably Nb2O5 / P2O5 is 1.6 to 2.0; 6) (SiO2+CaO+ZnO) / SrO is 0.3 to 8.0, preferably (SiO2+CaO+ZnO) / SrO is 0.5 to 5.0, more preferably (SiO2+CaO+ZnO) / SrO is 0.6 to 3.0, and further preferably (SiO2+CaO+ZnO) / SrO is 0.7 to 2.0; 7) (WO3+ZnO+K2O+CaO+MgO) / TiO2 is less than 2.0, preferably (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.05 to 1.5, more preferably (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.1 to 1.0, and further preferably (WO3+ZnO+K2O+CaO+MgO) / TiO2 is 0.2 to 0.8; 8) (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.03-0.4, preferably (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.04-0.3, more preferably (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.05-0.25, and further preferably (WO3+K2O+TiO2+B2O3) / Nb2O5 is 0.06-0.15; 9) Na2O / BaO is 0.05 to 2.0, preferably Na2O / BaO is 0.1 to 1.5, more preferably Na2O / BaO is 0.2 to 1.0, and further preferably Na2O / BaO is 0.4 to 0.9; 10) BaO / P2O5 is 0.15 to 0.9, preferably BaO / P2O5 is 0.25 to 0.8, more preferably BaO / P2O5 is 0.3 to 0.7, and further preferably BaO / P2O5 is 0.35 to 0.6; 11) (Li2O+B2O3+TiO2) / BaO is 0.06 to 2.0, preferably (Li2O+B2O3+TiO2) / BaO is 0.07 to 1.5, more preferably (Li2O+B2O3+TiO2) / BaO is 0.08 to 1.0, and further preferably (Li2O+B2O3+TiO2) / BaO is 0.1 to 0.5; 12) TiO2 / CaO is 0.4 to 10.0, preferably TiO2 / CaO is 0.8 to 8.0, more preferably TiO2 / CaO is 1.0 to 6.0, and further preferably TiO2 / CaO is 1.2 to 5.

0.

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

6. The optical glass according to any one of claims 1 to 3, characterized in that: Its components do not contain MgO; and / or do not contain ZnO; and / or do not contain Li2O; and / or do not contain K2O; and / or do not contain Ln2O3; and / or do not contain B2O3; and / or do not contain Al2O3; and / or do not contain WO3; and / or do not contain ZrO2; and / or do not contain Bi2O3; and / or do not contain clarifiers, and the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

7. The optical glass according to any one of claims 1 to 3, characterized in that: The refractive index n of the optical glass d 1.82 to 1.89, preferably 1.83 to 1.88, more preferably 1.84 to 1.87; Abbe number ν d It is 18-26, preferably 20-25, and more preferably 21-24.

8. 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 100 / 300℃ 100×10 -7 / K or less, preferably 95×10 -7 / K or less, more preferably 90×10 -7 / K or less; and / or acid resistance stability D A 2 or more, preferably 1; and / or water resistance stability D W Two or more types, preferably one type; and / or relative partial dispersion P g,F 0.58 to 0.72, preferably 0.60 to 0.68, more preferably 0.62 to 0.65; and / or relative partial dispersion deviation value ΔP g,F is 0.08 or less, preferably 0.005 to 0.06, more preferably 0.01 to 0.04; and / or the transition temperature T g 670°C or less, preferably 660°C or less, more preferably 650°C or less; and / or abrasion degree F A 250 to 290, preferably 260 to 285, more preferably 265 to 280; and / or density ρ is 4.00 g / cm 3 Below, preferably 3.90g / cm 3 Below, more preferably 3.80g / cm 3 Below; and / or 70 430nm or less, preferably λ 70 420nm or less, preferably λ 70 is 410nm or less; and / or λ5 is 400nm or less, preferably λ5 is 390nm or less, more preferably λ5 is 380nm or less; and / or weather resistance CR is 2 or more, preferably 1; and / or Young's modulus E is 8000×10 7 Pa or more, preferably 8500×10 7 Pa or more, more preferably 9000×10 7 Pa or more; and / or the bubble degree is A grade or more, preferably A0 grade or more, more preferably A 00 class.

9. A glass preform, characterized in that: Made of the optical glass described in any one of claims 1 to 8.

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

11. An optical instrument, characterized in that A method of manufacturing an optical glass comprising the optical glass according to any one of claims 1 to 8, or a method of manufacturing an optical element comprising the optical glass according to claim 10.

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