Optical glass, optical elements, and optical instruments

Abstract

The present invention provides optical glass containing, when expressed by weight percentage, P2O5: 16% to 33%, Nb2O5: 40% to 55%, TiO2: 1% to 13%, BaO: 1% to 15%, and Na2O: 0.5% to 15%. Through rational compositional design, the optical glass obtained in the present invention has the desired refractive index and Abbe number, as well as excellent intrinsic quality, meeting the requirements for use in high-performance optical instruments.

Description

[Technical Field]

[0001] The present invention relates to optical glass, and more particularly to optical glass having a refractive index of 1.86 to 1.93 and an Abbe number of 16 to 24, and to optical elements and optical instruments manufactured therefrom. [Background technology]

[0002] In recent years, with the rapid development of fields such as optoelectronic information, digital displays, surveillance security, and in-vehicle imaging, there has been an increasing demand for miniaturization, weight reduction, and high performance of optical elements used in optical systems. High-refractive-index, high-dispersion optical glass, when used in combination with low-dispersion optical glass, can effectively eliminate chromatic aberration and secondary spectra, while simultaneously effectively shortening the overall optical length of the lens and miniaturizing the imaging system. Therefore, the future application potential of such glass is very broad. For the same radius of curvature, higher refractive index glass provides a larger imaging field of view, which is advantageous in reducing the number of optical elements in optical instruments. As optical instruments become smaller, the demand for high-refractive-index glass will become increasingly pronounced.

[0003] Chinese patent application CN101792258A discloses a high-refractive-index, high-dispersion optical glass having a refractive index of 1.70 to 2.20, an Abbe number of 10 to 40, and containing 40 to 85 mol% TeO2. Such glass is prone to volatilization and striations during the manufacturing process due to the large amount of TeO2 it contains, which is unfavorable for forming optical glass with excellent internal quality. Chinese patent application CN1204073C discloses a high-refractive-index, high-dispersion optical glass having a refractive index of 1.88 or higher, an Abbe number of 22 to 28, and containing 15 to 25 wt% SiO2, and there is room for improvement in its meltability. [Overview of the project] [Problems that the invention aims to solve]

[0004] The problem that this invention aims to solve is to provide optical glass with excellent intrinsic quality, a refractive index of 1.86 to 1.93, and an Abbe number of 16 to 24. [Means for solving the problem]

[0005] The technical means employed by this invention to solve the problem are as follows:

[0006] Optical glass, when expressed by weight percentage, contains P2O5: 16% to 33%, Nb2O5: 40% to 55%, TiO2: 1% to 13%, BaO: 1% to 15%, and Na2O: 0.5% to 15%.

[0007] Furthermore, the composition of the optical glass, expressed by weight percentage, is as follows: CaO: 0-8%, and / or MgO: 0-5%, and / or SrO: 0-5%, and / or ZnO: 0-8%, 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%. The mixture further contains %, and / or WO3: 0-3%, and / or ZrO2: 0-5%, and / or Bi2O3: 0-3%, and / or TeO2: 0-5%, and / or a clarifying agent: 0-1%, wherein Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0008] The composition of optical glass, expressed by weight percentage, is as follows: P2O5: 16%~33%, Nb2O5: 40%~55%, TiO2: 1%~13%, BaO: 1%~15%, Na2O: 0.5%~15%, CaO: 0~8%, MgO: 0~5%, SrO: 0~5%, ZnO: 0~8%, Li2O: 0~5%, K2O: 0~5%, Ln2O3: 0~5%, SiO2: 0~5%. The mixture consists of B2O3: 0-5%, Al2O3: 0-3%, WO3: 0-3%, ZrO2: 0-5%, Bi2O3: 0-3%, TeO2: 0-5%, and a clarifying agent: 0-1%. The Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0009] Furthermore, the optical glass, when its composition is expressed by weight percentage, has a (B2O3+WO3+Bi2O3) / ZnO ratio of 2.0 or less, preferably (B2O3+WO3+Bi2O3) / ZnO ratio of 1.0 or less, more preferably (B2O3+WO3+Bi2O3) / ZnO ratio of 0.5 or less, and even more preferably (B2O3+WO3+Bi2O3) / ZnO ratio of 0.2 or less.

[0010] Furthermore, the optical glass, when its composition is expressed by weight percentage, has a ZnO / BaO ratio of 3.0 or less, preferably 0.05 to 2.0, more preferably 0.1 to 1.5, and even more preferably 0.2 to 0.8.

[0011] Furthermore, the optical glass, when its composition is expressed by weight percentage, has a (B2O3+Li2O+K2O) / ZnO ratio of 2.0 or less, preferably (B2O3+Li2O+K2O) / ZnO ratio of 1.0 or less, more preferably (B2O3+Li2O+K2O) / ZnO ratio of 0.5 or less, and even more preferably (B2O3+Li2O+K2O) / ZnO ratio of 0.2 or less.

[0012] Furthermore, the optical glass, when its composition is expressed by weight percentage, has a (P2O5+BaO) / (ZnO+CaO) ratio of 2.0 or higher, preferably (P2O5+BaO) / (ZnO+CaO) of 3.0 to 20.0, more preferably (P2O5+BaO) / (ZnO+CaO) of 5.0 to 15.0, and even more preferably (P2O5+BaO) / (ZnO+CaO) of 8.0 to 12.0.

[0013] Furthermore, the composition of the optical glass, when expressed by weight percentage, has a (Na2O+K2O) / Nb2O5 ratio of 0.05 to 0.45, preferably 0.1 to 0.4, more preferably 0.1 to 0.3, and even more preferably 0.1 to 0.25.

[0014] Furthermore, when the composition of the optical glass is expressed by weight percentage, (BaO+K2O+ZnO) / (Na2O+CaO) is 0.1 to 8.0, preferably (BaO+K2O+ZnO) / (Na2O+CaO) is 0.2 to 5.0, more preferably (BaO+K2O+ZnO) / (Na2O+CaO) is 0.3 to 2.5, and even more preferably (BaO+K2O+ZnO) / (Na2O+CaO) is 0.5 to 1.5.

[0015] Furthermore, the composition of the optical glass, expressed by weight percentage, is such that (TiO2+K2O) / P2O5 is 0.05 to 0.8, preferably (TiO2+K2O) / P2O5 is 0.1 to 0.6, more preferably (TiO2+K2O) / P2O5 is 0.1 to 0.5, and even more preferably (TiO2+K2O) / P2O5 is 0.15 to 0.4.

[0016] Furthermore, the optical glass, when its composition is expressed by weight percentage, has a (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 ratio of 0.8 or less, preferably (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 ratio of 0.5 or less, more preferably (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 ratio of 0.3 or less, and even more preferably (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 ratio of 0.1 or less, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3.

[0017] Furthermore, the composition of the optical glass, when expressed by weight percentage, is such that (WO3+TiO2) / Nb2O5 is 0.02 to 0.3, preferably (WO3+TiO2) / Nb2O5 is 0.05 to 0.25, more preferably (WO3+TiO2) / Nb2O5 is 0.05 to 0.2, and even more preferably (WO3+TiO2) / Nb2O5 is 0.07 to 0.17.

[0018] Furthermore, the optical glass, when its composition is expressed by weight percentage, has a ZnO / TiO2 ratio of 3.0 or less, preferably 0.01 to 2.0, more preferably 0.1 to 1.5, and even more preferably 0.2 to 0.8.

[0019] Furthermore, the composition of the optical glass, expressed by weight percentage, is such that TiO2 / BaO is 0.2 to 8.0, preferably 0.3 to 5.0, more preferably 0.5 to 3.0, and even more preferably 0.6 to 1.5.

[0020] Furthermore, when the composition of the optical glass is expressed by weight percentage, the ZnO / (Na2O+TiO2) ratio is 2.0 or less, preferably 0.01 to 1.5, more preferably 0.05 to 0.8, and even more preferably 0.05 to 0.4.

[0021] Furthermore, the composition of the optical glass, expressed by weight percentage, is such that TiO2 / CaO is 0.5 to 10.0, preferably 1.0 to 8.0, more preferably 2.0 to 7.0, and even more preferably 2.5 to 6.0.

[0022] Furthermore, the composition of the optical glass, expressed by weight percentage, is P2O5: 20%~30%, preferably P2O5: 22%~28%, and / or Nb2O5: 45%~55%, preferably Nb2O5: 46%~53%, and / or TiO2: 3%~10%, preferably TiO2: 4%~8%, and / or BaO: 2%~12%, preferably BaO: 3%~9%, and / or Na2O: 3%~12%, preferably N a2O: 6% to 10%, and / or CaO: greater than 0% and 6% or less, preferably CaO: 1% to 4%, and / or MgO: 0% to 3%, preferably MgO: 0% to 1%, and / or SrO: 0% to 3%, preferably SrO: 0% to 1%, and / or ZnO: greater than 0% and 6% or less, preferably ZnO: 1% to 4%, and / or Li2O: 0% to 3%, preferably Li2O: 0% to 1%, and / or K2O: 0% to 3%, preferably K2 O: 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: 0-3%, preferably ZrO2: 0 The mixture contains ~1% and / or Bi2O3:0~2%, preferably Bi2O3:0~1%, and / or TeO2:0~3%, preferably TeO2:0~1%, and / or clarifying agent:0~0.5%, preferably clarifying agent:0~0.1%, wherein the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0023] Further, the composition of the optical glass does not contain MgO, and / or does not contain SrO, 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 TeO₂, and / or does not contain a fining agent, wherein Ln₂O₃ is one or more selected from the group consisting of La₂O₃, Gd₂O₃, Y₂O₃, Yb₂O₃ and Lu₂O₃, and the fining agent is one or more selected from the group consisting of Sb₂O₃, SnO₂ and CeO₂.

[0024] Further, the refractive index n of the optical glass d is 1.86 to 1.93, preferably 1.87 to 1.92, more preferably 1.88 to 1.91, and the Abbe number ν d is 16 to 24, preferably 17 to 23, more preferably 18 to 22.

[0025] Further, the thermal expansion coefficient α of the optical glass 100 / 300℃ is 95×10 -7 / K or less, preferably 90×10 -7 / K or less, more preferably 85×10 -7 / K or less, and / or the acid resistance stability D A is class 2 or higher, preferably class 1, and / or the water resistance stability D W is class 2 or higher, preferably class 1, and / or the relative partial dispersion P g,F is 0.58 to 0.72, preferably 0.60 to 0.68, more preferably 0.63 to 0.66, and / or the relative partial dispersion deviation ΔP g,F is 0.08 or less, preferably 0.01 to 0.06, more preferably 0.02 to 0.05, and / or the transition temperature T g is 670°C or lower, preferably 660°C or lower, more preferably 650°C or lower, and / or the abrasion degree F AThe density ρ is 230-270, preferably 240-265, more preferably 245-260, and / or the density ρ is 3.90 g / cm³. 3 The following, preferably 3.80 g / cm³ 3 The following, and more preferably, 3.70 g / cm³ 3 The following and / or λ 70 The wavelength is 440 nm or less, preferably λ 70 λ is 430 nm or less, and more preferably, 70 The wavelength is 425 nm or less, and / or λ5 is 400 nm or less, preferably λ5 is 390 nm or less, more preferably λ5 is 385 nm or less, and / or weather resistance CR is class 2 or higher, preferably class 1, and / or Young's modulus E is 8000 × 10 7 Pa or higher, preferably 9000 × 10 7 Pa or higher, more preferably 9500 × 10 7 Pa or higher, and / or the degree of bubbles is level A or higher, preferably level A0 or higher, more preferably level A 00 That is the case.

[0026] A glass preform, manufactured from the optical glass described above.

[0027] An optical element, manufactured from the optical glass described above, or from the glass preform described above.

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

[0029] A beneficial effect of the present invention is that, through rational compositional design, the optical glass obtained in this invention has the desired refractive index and Abbe number, as well as excellent intrinsic quality, meeting the requirements for use in high-performance optical instruments. [Modes for carrying out the invention]

[0030] The embodiments of the optical glass of the present invention will be described in detail below. However, the present invention is not limited to the embodiments described below and can be modified as appropriate within the scope of the object of the present invention. In addition, explanations that are redundant may be omitted as appropriate, but this does not limit the spirit of the invention, and in the following, the optical glass of the present invention may be simply referred to as glass.

[0031] [Optical glass] The following describes the compositional (component) ranges of the optical glass of the present invention. In the present invention, unless otherwise specified, the content of each composition and the total content are all expressed in weight percentage (wt%), that is, as the weight percentage of the content of each composition and the total content relative to the total amount of glass material in terms of oxide composition. Here, "oxide-equivalent composition" means that when oxides, composite salts, and hydroxides used as raw materials for the compositional components of the optical glass of the present invention decompose into oxides during melting, the total amount of said oxides is considered to be 100%.

[0032] The numerical ranges described in this invention include upper and lower limits unless otherwise specified in particular cases. "Greater than or equal to" and "less than or equal to" include endpoint values ​​and all integers and fractions within this range, but are not limited to the specific values ​​stated when the range is limited. "And / or" as used herein is inclusive; for example, "A and / or B" means A only, or B only, or both A and B.

[0033] <Required and Optional Ingredients> P2O5 is a network component of the glass in this invention. Compared to silicate glass, phosphate glass can be melted at low temperatures and is advantageous for increasing the light transmittance of the glass. However, if the P2O5 content is too high, it becomes difficult to obtain a high refractive index for the glass. Therefore, in this invention, the P2O5 content is 16% to 33%, preferably 20% to 30%, and more preferably 22% to 28%.

[0034] Nb2O5 is a high-refractive index, high-dispersion component that enhances the refractive index and devitrification resistance of glass, as well as the relative partial dispersion (P) of glass. g,F ) and relative partial variance deviation (ΔP g,F ) has the effect of reducing. In the present invention, the above effect is achieved by including 40% or more Nb2O5, preferably the lower limit of the Nb2O5 content is 45%, and more preferably 46%. If the Nb2O5 content exceeds 55%, the thermal stability and chemical stability of the glass decrease, and the light transmittance decreases. Therefore, in the present invention, the upper limit of the Nb2O5 content is 55%, and preferably 53%.

[0035] TiO2 possesses high refractive index and high dispersion properties, enhancing the chemical stability of glass and improving the relative partial dispersion (P) of glass. g,F ) and relative partial variance deviation (ΔP g,F The TiO2 content can be adjusted, but if it is too high, the devitrification resistance and light transmittance of the glass will decrease. Therefore, the TiO2 content is 1% to 13%, preferably 3% to 10%, and more preferably 4% to 8%.

[0036] BaO can improve the devitrification resistance and hardness of glass, and reduce the refractive index temperature coefficient and thermal expansion coefficient of glass. In this invention, the above effects are achieved by including 1% or more BaO, preferably 2% or more, and more preferably 3% or more. On the other hand, by keeping the BaO content at 15% or less, it is possible to prevent a decrease in chemical stability due to an excessively high BaO content. Therefore, the BaO content is 15% or less, preferably 12% or less, and more preferably 9% or less.

[0037] In some embodiments, controlling the ratio of TiO2 content to BaO content, TiO2 / BaO, within the range of 0.2 to 8.0 is advantageous in increasing the chemical stability of the glass and lowering the thermal expansion coefficient of the glass. Therefore, preferably, TiO2 / BaO is 0.2 to 8.0, and more preferably, TiO2 / BaO is 0.3 to 5.0. Furthermore, controlling TiO2 / BaO within the range of 0.5 to 3.0 can further optimize the degree of glass wear, and the glass can achieve the desired P g,F Value and ΔP g,F This makes it easier to obtain the desired value. Therefore, more preferably, the TiO2 / BaO ratio is 0.5 to 3.0, and even more preferably, the TiO2 / BaO ratio is 0.6 to 1.5.

[0038] CaO contributes to adjusting the optical constants of glass and improves its workability and weather resistance. However, if the CaO content is too high, the glass's devitrification resistance deteriorates. Therefore, the CaO content is 0-8%, preferably greater than 0% and 6% or less, and more preferably 1%-4%.

[0039] In some embodiments, controlling the ratio of TiO2 content to CaO content, TiO2 / CaO, within the range of 0.5 to 10.0 is advantageous in reducing the thermal expansion coefficient of the glass and optimizing the Young's modulus and abrasion of the glass. Therefore, preferably, TiO2 / CaO is 0.5 to 10.0, more preferably 1.0 to 8.0, even more preferably 2.0 to 7.0, and even more preferably 2.5 to 6.0.

[0040] SrO can adjust the refractive index and dispersion of glass, but if its content is too high, the chemical stability of the glass decreases and the cost of the glass increases. Therefore, the SrO content is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is even more preferable to not contain SrO.

[0041] While MgO is beneficial in reducing the density and melting temperature of glass, too much MgO makes it difficult for the refractive index of the glass to meet design requirements, reducing the devitrification resistance and stability of the glass. Therefore, the MgO content is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is even more preferable to have no MgO content.

[0042] ZnO can lower the transition temperature and melting temperature of glass, improve the chemical stability of glass, and reduce the high-temperature viscosity of glass. However, if the ZnO content is too high, the devitrification resistance of glass deteriorates, and the viscosity becomes too low, making it prone to devitrification. Therefore, in the present invention, the ZnO content is 0 to 8%, preferably greater than 0 and 6% or less, and more preferably 1% to 4%.

[0043] In some embodiments, controlling the ratio of ZnO content to the total content of Na2O and TiO2 (Na2O + TiO2), ZnO / (Na2O + TiO2), to 2.0 or less prevents an increase in the glass transition temperature and increases the degree of glass bubbles. Therefore, preferably, ZnO / (Na2O + TiO2) is 2.0 or less, and more preferably, ZnO / (Na2O + TiO2) is 0.01 to 1.5. Furthermore, controlling ZnO / (Na2O + TiO2) within the range of 0.05 to 0.8 further optimizes the degree of glass wear and weather resistance. Therefore, more preferably, ZnO / (Na2O + TiO2) is 0.05 to 0.8, and even more preferably, ZnO / (Na2O + TiO2) is 0.05 to 0.4.

[0044] In some embodiments, controlling the ratio (P2O5+BaO) / (ZnO+CaO), which is the total content of P2O5 and BaO, to 2.0 or higher can increase the light transmittance of the glass and prevent deterioration of the transition temperature. Therefore, preferably, (P2O5+BaO) / (ZnO+CaO) is 2.0 or higher, and more preferably, (P2O5+BaO) / (ZnO+CaO) is 3.0 to 20.0. Furthermore, controlling (P2O5+BaO) / (ZnO+CaO) within the range of 5.0 to 15.0 can further optimize the Young's modulus and degree of bubbleness of the glass. Therefore, more preferably, (P2O5+BaO) / (ZnO+CaO) is 5.0 to 15.0, and even more preferably, (P2O5+BaO) / (ZnO+CaO) is 8.0 to 12.0.

[0045] In some embodiments, controlling the ratio of ZnO content to BaO content, ZnO / BaO, to 3.0 or less is advantageous for improving the weather resistance of the glass. Therefore, preferably, ZnO / BaO is 3.0 or less. Furthermore, controlling ZnO / BaO within the range of 0.05 to 2.0 can lower the transition temperature of the glass and optimize the degree of glass wear. Therefore, more preferably, ZnO / BaO is 0.05 to 2.0, even more preferably, ZnO / BaO is 0.1 to 1.5, and even more preferably, ZnO / BaO is 0.2 to 0.8.

[0046] In some embodiments, controlling the ratio of ZnO content to TiO2 content, ZnO / TiO2, to 3.0 or less optimizes the wear and chemical stability of the glass and prevents an increase in the glass transition temperature. Therefore, preferably, ZnO / TiO2 is 3.0 or less, more preferably ZnO / TiO2 is 0.01 to 2.0, even more preferably ZnO / TiO2 is 0.1 to 1.5, and even more preferably ZnO / TiO2 is 0.2 to 0.8.

[0047] Li2O can improve the meltability of glass and lower the transition temperature, but 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, in the present invention, the Li2O content is 0 to 5%, preferably 0 to 3%, and more preferably 0 to 1%. In some embodiments, it is even more preferable to not contain Li2O.

[0048] Na2O can improve the meltability and moldability of glass and optimize its light transmittance, but if its content is too high, it is detrimental to the thermal expansion coefficient and chemical stability of the glass. Therefore, the Na2O content is 0.5% to 15%, preferably 3% to 12%, and more preferably 6% to 10%.

[0049] K2O improves the thermal stability and meltability of glass, but if its content is too high, the glass's resistance to devitrification decreases. Therefore, the K2O content is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is even more preferable to omit K2O.

[0050] In some embodiments, by controlling the ratio of the total content of Na2O and K2O (Na2O+K2O) to the content of Nb2O5 ((Na2O+K2O) / Nb2O5) within the range of 0.05 to 0.45, the glass can be made to have high refractive index, high dispersion and desired P properties. g,F Value and ΔP g,F This is advantageous for obtaining the desired value and optimizes the devitrification resistance and abrasion resistance of the glass. Therefore, preferably, (Na2O+K2O) / Nb2O5 is 0.05 to 0.45, more preferably, (Na2O+K2O) / Nb2O5 is 0.1 to 0.4, even more preferably, (Na2O+K2O) / Nb2O5 is 0.1 to 0.3, and even more preferably, (Na2O+K2O) / Nb2O5 is 0.1 to 0.25.

[0051] In some embodiments, by controlling the ratio of the total content of TiO2 and K2O (TiO2+K2O) to the content of P2O5 ((TiO2+K2O) / P2O5) within the range of 0.05 to 0.8, the glass can achieve a desired P2O content. g,F Value and ΔP g,F This maintains a certain value while preventing deterioration of the light transmittance and Young's modulus of the glass. Therefore, preferably, (TiO2+K2O) / P2O5 is 0.05 to 0.8, more preferably, (TiO2+K2O) / P2O5 is 0.1 to 0.6, even more preferably, (TiO2+K2O) / P2O5 is 0.1 to 0.5, and even more preferably, (TiO2+K2O) / P2O5 is 0.15 to 0.4.

[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 devitrification resistance of the glass can be prevented. Therefore, in the present invention, the Ln2O3 content is 0 to 5%, preferably 0 to 3%, and more preferably 0 to 1%. In some embodiments, it is even more preferable not to contain Ln2O3.

[0053] Adding SiO2 to phosphate glass can make the glass network denser, increasing the chemical stability and mechanical strength of the glass. However, phosphate glass networks do not have a strong affinity for SiO2, and if the SiO2 content is too high, phase separation and precipitation are likely to occur. Therefore, in the present invention, the SiO2 content is 0 to 5%, preferably 0 to 3%, and more preferably 0 to 1%.

[0054] B2O3 improves the thermal stability and meltability of glass, but if its content is high, the chemical stability and devitrification resistance of the glass decrease. Therefore, in the present invention, the B2O3 content is 0 to 5%, preferably 0 to 3%, and more preferably 0 to 1%. In some embodiments, B2O3 is even more preferably omitted.

[0055] In some embodiments, by controlling the ratio of the total content of B2O3, Li2O, and K2O (B2O3+Li2O+K2O) to the content of ZnO ((B2O3+Li2O+K2O) / ZnO) to 2.0 or less, the glass can achieve a desired P g,F Value and ΔP g,F This allows for obtaining the desired value and Young's modulus, while also preventing deterioration of the glass's chemical stability and bubble density. Therefore, preferably, (B2O3+Li2O+K2O) / ZnO is 2.0 or less, more preferably, (B2O3+Li2O+K2O) / ZnO is 1.0 or less, even more preferably, (B2O3+Li2O+K2O) / ZnO is 0.5 or less, and even more preferably, (B2O3+Li2O+K2O) / ZnO is 0.2 or less.

[0056] In some embodiments, controlling the ratio (BaO+K2O+ZnO) / (Na2O+CaO), which is the total content of BaO, K2O, and ZnO, to the total content of Na2O and CaO, within the range of 0.1 to 8.0 is advantageous for reducing the density and thermal expansion coefficient of the glass. Therefore, preferably, (BaO+K2O+ZnO) / (Na2O+CaO) is 0.1 to 8.0, and more preferably, (BaO+K2O+ZnO) / (Na2O+CaO) is 0.2 to 5.0. Furthermore, controlling (BaO+K2O+ZnO) / (Na2O+CaO) within the range of 0.3 to 2.5 can further optimize the abrasion resistance and weather resistance of the glass. Therefore, more preferably, (BaO+K2O+ZnO) / (Na2O+CaO) is 0.3 to 2.5, and even more preferably, (BaO+K2O+ZnO) / (Na2O+CaO) is 0.5 to 1.5.

[0057] Al2O3 can improve the chemical stability of glass, but if its content exceeds 3%, the meltability and light transmittance of the glass deteriorate. Therefore, in the present invention, the Al2O3 content is 0 to 3%, preferably 0 to 2%, and more preferably 0 to 1%. In some embodiments, it is even more preferable to not contain Al2O3.

[0058] WO3 is an optional component that can adjust the optical constants and devitrification resistance of the glass, but if its content is high, the transmittance and devitrification resistance of the glass will decrease. Therefore, the WO3 content is 0 to 3%, preferably 0 to 2%, and more preferably 0 to 1%. In some embodiments, it is even more preferable not to contain WO3.

[0059] In some embodiments, controlling the ratio (WO3+TiO2) / Nb2O5, which is the total content of WO3 and TiO2 (WO3+TiO2) to the content of Nb2O5, within the range of 0.02 to 0.3 is advantageous for reducing the density of the glass and optimizing the Young's modulus and abrasion of the glass. Therefore, preferably, (WO3+TiO2) / Nb2O5 is 0.02 to 0.3, more preferably, (WO3+TiO2) / Nb2O5 is 0.05 to 0.25, even more preferably, (WO3+TiO2) / Nb2O5 is 0.05 to 0.2, and even more preferably, (WO3+TiO2) / Nb2O5 is 0.07 to 0.17.

[0060] The appropriate amount of ZrO2 improves the mechanical strength and hardness of the glass, enhances its devitrification resistance, and improves the P content of the glass. g,F Value and ΔP g,F The value can be adjusted. However, ZrO2 is poorly soluble in phosphate glass, and if its content is too high, melting becomes difficult. Therefore, in the present invention, the ZrO2 content is 0 to 5%, preferably 0 to 3%, and more preferably 0 to 1%. In some embodiments, it is even more preferable to not contain ZrO2.

[0061] Bi2O3 can increase the refractive index of glass, but a high density of Bi2O3 is detrimental to the lightweight design of the glass. Therefore, in the present invention, the Bi2O3 content is 0 to 3%, preferably 0 to 2%, and more preferably 0 to 1%. In some embodiments, it is even more preferable to not contain Bi2O3.

[0062] In some embodiments, by controlling the ratio of the total content of B2O3, WO3, and Bi2O3 (B2O3+WO3+Bi2O3) to the content of ZnO ((B2O3+WO3+Bi2O3) / ZnO) to 2.0 or less, the glass can achieve a desired P g,F Value and ΔP g,F This is advantageous for obtaining the desired value, while also optimizing the light transmittance and bubble density of the glass and preventing an increase in glass density. Therefore, preferably, (B2O3+WO3+Bi2O3) / ZnO is 2.0 or less, more preferably, (B2O3+WO3+Bi2O3) / ZnO is 1.0 or less, even more preferably, (B2O3+WO3+Bi2O3) / ZnO is 0.5 or less, and even more preferably, (B2O3+WO3+Bi2O3) / ZnO is 0.2 or less.

[0063] In some embodiments, by controlling the ratio of the total content of Ln2O3, Li2O, K2O, WO3, and Bi2O3 (Ln2O3+Li2O+K2O+WO3+Bi2O3) to the content of TiO2 ((Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2) to 0.8 or less, the glass can achieve a desired P g,F Value and ΔP g,F The glass has a value that optimizes its chemical stability and bubble degree. Therefore, preferably, (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is 0.8 or less, more preferably, (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is 0.5 or less, even more preferably, (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is 0.3 or less, and even more preferably, (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is 0.1 or less.

[0064] TeO2 is an optional component that increases the refractive index of glass and lowers its transition temperature. However, if its content is too high, it readily reacts with platinum-based equipment, reducing the service life of the equipment, allowing platinum particles to easily become embedded in the glass, decreasing the glass's transmittance, and causing striations due to volatilization, thus degrading the intrinsic quality of the glass. Therefore, the TeO2 content is limited to 5% or less, preferably 3% or less, and more preferably 1% or less. In some embodiments, TeO2 is even more preferably omitted.

[0065] In the present invention, by including 0 to 1% of one or more components from Sb2O3, SnO2, and CeO2 as a clarifying agent, the clarifying effect of the glass can be enhanced and the degree of bubbles in the glass can be increased. Preferably, the clarifying agent content is 0 to 0.5%, and more preferably, 0 to 0.1%. The optical glass of the present invention has a rational design of composition types and content and excellent bubble degree, and in some embodiments, it is even more preferably free of clarifying agents. When the Sb2O3 content exceeds 1%, the clarifying performance of the glass tends to decrease, and its strong oxidizing effect accelerates the corrosion of platinum or platinum alloy containers used to melt the glass and the deterioration of molding dies. Therefore, in the present invention, the Sb2O3 content is preferably 0 to 1%, more preferably 0 to 0.5%, even more preferably 0 to 0.1%, and even more preferably free of Sb2O3. SnO2 may be used as a clarifying agent, but if its content exceeds 1%, the tendency for the glass to become discolored increases, or when the glass is heated, softened, and reshaped by press molding, Sn tends to act as a nucleation site for crystal formation, leading to devitrification. Therefore, the SnO2 content of the present invention is preferably 0-1%, more preferably 0-0.5%, even more preferably 0-0.1%, and even more preferably no SnO2 is present. The action and content ratio of CeO2 are the same as that of SnO2, and its content is preferably 0-1%, more preferably 0-0.5%, even more preferably 0-0.1%, and even more preferably no CeO2 is present.

[0066] <Prohibited ingredients> 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 included in small amounts, either individually or in combination, the glass becomes colored, absorption occurs at specific wavelengths in the visible light region, and thereby weakens the property of the present invention that enhances the visible light transmittance effect. Therefore, it is preferable that optical glass, in particular, which requires transmittance at wavelengths in the visible light region, is substantially free of these oxides.

[0067] In recent years, there has been a trend to reduce the use of oxides of Th, Cd, Tl, Os, Be, and Se as hazardous chemical substances, and measures to protect the environment are necessary not only in the glass manufacturing process but also in the processing process and disposal after the product is manufactured. Therefore, when environmental impact is a priority, it is preferable to substantially omit these substances unless they are inevitably mixed in. As a result, the optical glass will substantially contain no substances that pollute the environment. Consequently, the optical glass of the present invention can be manufactured, processed, and disposed of without taking any special environmental protection measures.

[0068] For environmental reasons, the optical glass of the present invention preferably does not contain As2O3 and PbO.

[0069] In this specification, "not contained" and "0%" mean that the compound, molecule, or element in question is not intentionally added to the optical glass of the present invention as a raw material. However, some impurities or components that were not intentionally added may be present in the raw materials and / or equipment used to produce the optical glass, and these may be present in small or trace amounts in the final optical glass. Such cases are also within the scope of protection of the patent of this invention.

[0070] The performance of the optical glass of the present invention will be described below.

[0071] <Refractive index and Abbe number> Refractive index of optical glass (n d ) and Abbe number (v d) shall be measured according to the method specified in GB / T7962.1-2010.

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

[0073] In some embodiments, the refractive index (n) of the optical glass of the present invention is determined by the present invention. d The upper limit of ) is 1.93, preferably 1.92, and more preferably 1.91.

[0074] In some embodiments, the Abbe number (ν) of the optical glass of the present invention is used. d The lower limit of ) is 16, preferably 17, and more preferably 18.

[0075] In some embodiments, the Abbe number (ν) of the optical glass of the present invention is used. d The upper limit of ) is 24, preferably 23, and more preferably 22.

[0076] <Coefficient of thermal expansion> The thermal expansion coefficient of optical glass (α 100 / 300℃ The data for 100-300°C is tested according to the method specified in GB / T7962.16-2010.

[0077] In some embodiments, the optical glass of the present invention has a thermal expansion coefficient (α 100 / 300℃ ) is 95 x 10 -7 / K or less, preferably 90 × 10 -7 / K or less, more preferably 85 × 10 -7 It is less than or equal to / K.

[0078] <Acid resistance stability> Acid resistance stability of optical glass (D A The (powder method) is measured according to the method specified in GB / T17129.

[0079] In some embodiments, the acid resistance stability of the optical glass of the present invention (D A ) consists of two or more classes, preferably one class.

[0080] <Water resistance stability> Water resistance stability of optical glass (D W The (powder method) is measured according to the method specified in GB / T17129.

[0081] In some embodiments, the water resistance stability of the optical glass of the present invention (D W ) consists of two or more classes, preferably one class.

[0082] <Relative partial variance and relative partial variance deviation score> Relative partial variance (P g,F ) and relative partial variance deviation (ΔP g,F The origin of ) is explained by the following formula.

[0083] The relative partial dispersion with respect to wavelengths x and y is expressed by the following equation (1).

[0084] P x,y =(n x -n y ) / (n F -n C )(1) According to the Abbe number formula, for many so-called "normal glass" (hereinafter, H-K6 and F4 will be selected as "normal glass"), the following equation (2) holds true.

[0085] P x,y =m x,y ·v d +b x,y (2) Such a linear relationship is P x,y Let v be the vertical coordinate. d Let be expressed as the x-coordinate, and in the equation, m x,y The slope is and b x,y This is the intercept.

[0086] As is well known, the correction of secondary spectrum, that is, achromatization for two or more wavelengths, requires at least one type of glass that does not conform to the above formula (2) (i.e., its P x,y value deviates from the Abbe number empirical formula), and the deviation value is represented by ΔP x,y When expressed by this, each P x,y -v d point is shifted by an amount of ΔP x,y relative to the "normal line" conforming to the above formula (2). Thus, the ΔP x,y value of each glass can be obtained by the following formula (3).

[0087] P x,y =m x,y ·v d +b x,y +ΔP x,y (3) Therefore, ΔP x,y quantitatively indicates the deviation characteristic of anomalous dispersion when compared with "normal glass".

[0088] Therefore, based on the above, the calculation formulas for relative partial dispersion (P g,F ) and relative partial dispersion deviation (ΔP g,F ) are the following formulas (4) and (5).

[0089] P g,F =(n g -n F ) / (n F -n C )(4) ΔP g,F =P g,F -0.6457+0.001703v d (5) In some embodiments, the lower limit of the relative partial dispersion (P g,F ) of the optical glass of the present invention is 0.58, preferably 0.60, and more preferably 0.63.

[0090] In some embodiments, the upper limit of the relative partial dispersion (P g,F ) of the optical glass of the present invention is 0.72, preferably 0.68, and more preferably 0.66.

[0091] In some embodiments, the relative partial dispersion deviation value (ΔP g,F ) of the optical glass of the present invention has a lower limit of 0.01, preferably 0.02.

[0092] In some embodiments, the relative partial dispersion deviation value (ΔP g,F ) of the optical glass of the present invention has an upper limit of 0.08, preferably 0.06, and more preferably 0.05.

[0093] <Transition temperature> The transition temperature (T g ) of optical glass is measured according to the method specified in "GB / T 7962.16-2010".

[0094] In some embodiments, the optical glass of the present invention has a transition temperature (T g ) of 670°C or lower, preferably 660°C or lower, and more preferably 650°C or lower.

[0095] <Abrasion degree> The abrasion degree (F A ) of optical glass is a value obtained by multiplying the ratio of the abrasion amount of a sample to the abrasion amount (volume) of a standard sample (H-K9 glass) by 100 under the same all conditions, and is represented by the following formula.

[0096] F A =V / V0×100=(W / ρ) / (W0 / ρ0)×100 In the formula, V is the volume abrasion amount of the test sample, V0 is the volume abrasion amount of the standard sample, W is the mass abrasion amount of the test sample, W0 is the mass abrasion amount of the standard sample, ρ is the density of the test sample, ρ0 is the density of the standard sample.

[0097] In some embodiments, the abrasion degree (F AThe lower limit of ) is 230, preferably 240, and more preferably 245.

[0098] In some embodiments, the degree of wear (F) of the optical glass of the present invention is A The upper limit of ) is 270, preferably 265, and more preferably 260.

[0099] <density> The density (ρ) is measured according to the method specified in GB / T7962.20-2010.

[0100] In some embodiments, the density (ρ) of the optical glass of the present invention is 3.90 g / cm³. 3 The following, preferably 3.80 g / cm³ 3 The following, and more preferably, 3.70 g / cm³ 3 The following applies:

[0101] <Coloring degree> The short-wave transmission spectral characteristics of the glass of the present invention are as follows: chromaticity (λ 70 And it is represented by λ5). 70 This refers to the corresponding wavelength when the glass transmittance reaches 70%. λ 70 The measurement is performed using a glass with a thickness of 10 ± 0.1 mm, having two opposing planes that are parallel to each other and optically polished, and measuring the spectral transmittance in the wavelength range of 280 nm to 700 nm, using the wavelength that shows a transmittance of 70%. The so-called spectral transmittance or transmittance is the intensity I of the glass surface. in Light is incident perpendicularly, passes through the glass, and is emitted from one plane with intensity I out When light is emitted, out / I in This quantity is represented by λ and is the transmittance including the surface reflection loss at the above surface of the glass. The higher the refractive index of the glass, the greater the surface reflection loss. Therefore, in high refractive index glass, λ 70 A small value indicates that the glass itself has very little coloration and therefore high light transmittance.

[0102] In some embodiments, the λ of the optical glass of the present invention 70 It is 440 nm or less, preferably λ 70 λ is 430 nm or less, and more preferably λ 70 It is below 425nm.

[0103] In some embodiments, the λ5 of the optical glass of the present invention is 400 nm or less, preferably 390 nm or less, and more preferably 385 nm or less.

[0104] <Weather resistance> The test method for the weather resistance (CR) of optical glass is as follows: The sample is placed in a test box with a saturated water vapor atmosphere at 90% relative humidity and circulated alternately at 40-50°C every hour for 15 cycles. The weather resistance class is determined by the change in turbidity before and after the sample is left standing, and the weather resistance class classifications are shown in Table 1.

[0105] [Table 1]

[0106] In some embodiments, the weather resistance (CR) of the optical glass of the present invention is class 2 or higher, preferably class 1.

[0107] Young's modulus Young's modulus (E) is calculated by measuring the longitudinal and transverse wave velocities using ultrasound and employing the following formula.

number

[0108] In some embodiments, the Young's modulus (E) of the optical glass of the present invention is 8000 × 10⁻¹⁰. 7 Pa or higher, preferably 9000 × 10 7 Pa or higher, more preferably 9500 × 10 7 It is Pa or higher.

[0109] <Bubble level> The bubble content of optical glass shall be measured according to the method specified in GB / T7962.8-2010.

[0110] In some embodiments, the bubble level of the optical glass of the present invention is level A or higher, preferably level A0 or higher, and more preferably level A 00 That is the case.

[0111] [Manufacturing method for optical glass] The method for manufacturing the optical glass of the present invention is as follows. The glass of the present invention is manufactured using conventional raw materials and processes, and is manufactured using raw materials that include, but are not limited to, oxides, hydroxides, complex salts (e.g., carbonates, nitrates, sulfates, phosphates, metaphosphates, etc.), boric acid, etc. After compounding the raw materials in a conventional manner, the compounded furnace material is placed in a melting furnace (e.g., a platinum or platinum alloy crucible) at 1050 to 1250°C, preferably 1100 to 1200°C, and melted. After clarification and homogenization, a homogeneous molten glass free of bubbles and undissolved substances is obtained, and this molten glass is cast in a mold and annealed to manufacture the glass. Those skilled in the art can appropriately select the raw materials, process methods, and process parameters as needed.

[0112] [Glass preforms and optical elements] Glass preforms can be manufactured from manufactured optical glass using, for example, direct gob molding, polishing, or press molding methods such as hot press molding. Specifically, glass preforms can be manufactured by directly applying precision gob molding to molten optical glass to produce precision glass preforms, by applying machining such as grinding and polishing, or by manufacturing a preform for press molding from optical glass, re-heat press molding the preform, and then polishing it. However, the means for manufacturing glass preforms are not limited to the above-mentioned methods.

[0113] As described above, the optical glass of the present invention is useful for various optical elements and optical designs. In particular, it is preferable to form a preform from the optical glass of the present invention and use the preform to manufacture optical elements such as lenses and prisms by performing reheat press molding, precision press molding, etc.

[0114] Both the glass preform and the optical element of the present invention are formed from the optical glass of the present invention described above. The glass preform of the present invention possesses the excellent properties of optical glass, and the optical element of the present invention possesses the excellent properties of optical glass, making it possible to provide various optical elements such as lenses and prisms with high optical value.

[0115] Examples of lenses include various types of lenses whose lens surfaces are spherical or aspherical, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses.

[0116] [Optical equipment] The optical elements formed from the optical glass of the present invention can be used to manufacture optical devices such as cameras, imaging devices, projection devices, display devices, in-vehicle devices, and monitoring devices.

[0117] (Examples) <Examples of optical glass applications> To further clarify and explain the technical solutions of the present invention, the following non-limiting embodiments are provided.

[0118] In this embodiment, optical glass having the compositions shown in Tables 2 to 4 is obtained by the optical glass manufacturing method described above. Furthermore, the properties of each glass are measured using the measurement method described in the present invention, and the measurement results are shown in Tables 2 to 4.

[0119] [Table 2] TIFF2026529537000004.tif254170TIFF2026529537000005.tif68170

[0120] [Table 3] TIFF2026529537000007.tif252170TIFF2026529537000008.tif68170

[0121] [Table 4] TIFF2026529537000010.tif253170TIFF2026529537000011.tif68170

[0122] <Examples of glass preforms> From the glass obtained in Examples 1 to 21 of optical glass, various lenses such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, plano-concave lenses, and preforms such as prisms are manufactured using methods such as polishing, reheat press molding, and precision press molding.

[0123] <Examples of optical elements> The preforms obtained in the above-described examples of glass preforms are annealed to fine-tune the refractive index while reducing internal stress in the glass so that optical properties such as refractive index reach the desired values.

[0124] Next, each preform is ground and polished to manufacture various lenses and prisms, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. An anti-reflective coating can also be applied to the surface of the resulting optical elements.

[0125] <Examples of optical instruments> Optical elements manufactured from the above-described embodiments can be used, by optical design, to form optical members or optical assemblies using one or more optical elements, for example, in imaging equipment, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / lighting in the automotive field, lithography technology, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips.

Claims

1. When the composition is expressed as a percentage by weight, P ２ O ５ :16%~33%, Nb ２ O ５ :40%~55%, TiO ２ : 1% to 13%, BaO: 1% to 15%, and Na ２ Optical glass characterized by containing O: 0.5% to 15%.

2. When the composition is expressed in percentage by weight, it contains CaO: 0-8%, and / or MgO: 0-5%, and / or SrO: 0-5%, and / or ZnO: 0-8%, and / or Li ２ O: 0-5%, and / or K ２ O: 0-5%, and / or Ln ２ O ３ : 0-5%, and / or SiO ２ : 0-5%, and / or B ２ O ３ : 0-5%, and / or Al ２ O ３ : 0-3%, and / or WO ３ : 0-3%, and / or ZrO ２ : 0-5%, and / or Bi ２ O ３ : 0-3%, and / or TeO ２ : 0-5%, and / or fining agent: 0-1%, wherein said Ln ２ O ３ is selected from La ２ O ３ , Gd ２ O ３ , Y ２ O ３ , Yb ２ O ３ , Lu ２ O ３ one or more of the above, and the fining agent is selected from Sb ２ O ３ , SnO ２ , CeO ２ one or more of the above, the optical glass according to claim 1.

3. When the composition is expressed as a percentage by weight, P ２ O ５ :16%~33%, Nb ２ O ５ :40%~55%, TiO ２ : 1% to 13%, BaO: 1% to 15%, Na ２ O: 0.5% to 15%, CaO: 0 to 8%, MgO: 0 to 5%, SrO: 0 to 5%, ZnO: 0 to 8%, Li ２ O: 0-5%, K ２ O: 0-5%, Ln ２ O ３ : 0-5%, SiO ２ : 0-5%, B ２ O ３ : 0-5%, Al ２ O ３ : 0-3%, WO ３ : 0-3%, ZrO ２ : 0-5%, Bi ２ O ３ : 0-3%, TeO ２ Ln ２ O ３ La ２ O ３ , Gd ２ O ３ , Y ２ O ３ Yb ２ O ３ Lu ２ O ３ It is one or more of the following, and the clarifying agent is Sb ２ O ３ , SnO ２ , CEO ２ An optical glass characterized by being one or more of the following types.

4. When the composition is expressed as a percentage by weight, 1) (B ２ O ３ +WO ３ +Bi ２ O ３ ) / ZnO is 2.0 or less, preferably, (B ２ O ３ +WO ３ +Bi ２ O ３ ) / ZnO is 1.0 or less, more preferably, (B ２ O ３ +WO ３ +Bi ２ O ３ ) / ZnO is 0.5 or less, further preferably, (B ２ O ３ +WO ３ +Bi ２ O ３ ) / ZnO is 0.2 or less, 2) The ZnO / BaO ratio is 3.0 or less, preferably 0.05 to 2.0, more preferably 0.1 to 1.5, and even more preferably 0.2 to 0.

8. 3) (B ２ O ３ + Li ２ O + K ２ O) / ZnO is 2.0 or less, preferably (B ２ O ３ + Li ２ O + K ２ O) / ZnO is 1.0 or less, more preferably (B ２ O ３ + Li ２ O + K ２ O) / ZnO is 0.5 or less, still more preferably (B ２ O ３ + Li ２ O + K ２ O) / ZnO is 0.2 or less, 4) (P ２ O ５ (P) + BaO) / (ZnO + CaO) is 2.0 or greater, preferably (P ２ O ５ (P) + BaO) / (ZnO + CaO) is 3.0 to 20.0, and more preferably (P ２ O ５ (P) + BaO) / (ZnO + CaO) is 5.0 to 15.0, and more preferably (P ２ O ５ The ratio of (+BaO) / (ZnO+CaO) is between 8.0 and 12.

0. 5) (Na ２ O+K ２ O) / Nb ２ O ５ The ratio is 0.05 to 0.45, preferably (Na ２ O+K ２ O) / Nb ２ O ５ The ratio is 0.1 to 0.4, and more preferably (Na ２ O+K ２ O) / Nb ２ O ５ The ratio is 0.1 to 0.3, and more preferably (Na ２ O+K ２ O) / Nb ２ O ５ The value must be between 0.1 and 0.

25. 6) (BaO + K ２ O+ZnO) / (Na ２ (O + CaO) is 0.1 to 8.0, preferably (BaO + K ２ O+ZnO) / (Na ２ (O + CaO) is 0.2 to 5.0, more preferably (BaO + K ２ O+ZnO) / (Na ２ (O + CaO) is 0.3 to 2.5, and more preferably (BaO + K ２ O+ZnO) / (Na ２ The ratio of O + CaO is between 0.5 and 1.

5. 7) (TiO ２ +K ２ O) / P ２ O ５ The ratio is 0.05 to 0.8, preferably (TiO ２ +K ２ O) / P ２ O ５ is 0.1 to 0.6, and more preferably (TiO ２ +K ２ O) / P ２ O ５ is 0.1 to 0.5, and more preferably (TiO ２ +K ２ O) / P ２ O ５ The value is between 0.15 and 0.

4. 8) (Ln ２ O ３ +Li ２ O+K ２ O+WO ３ +Bi ２ O ３ ) / TiO ２ It is 0.8 or less, preferably (Ln ２ O ３ +Li ２ O+K ２ O+WO ３ +Bi ２ O ３ ) / TiO ２ It is 0.5 or less, and more preferably (Ln ２ O ３ +Li ２ O+K ２ O+WO ３ +Bi ２ O ３ ) / TiO ２ It is 0.3 or less, and more preferably (Ln ２ O ３ +Li ２ O+K ２ O+WO ３ +Bi ２ O ３ ) / TiO ２ The value must be 0.1 or less. 、 9) (WO ３ +TiO ２ ) / Nb ２ O ５ The ratio is 0.02 to 0.3, preferably (WO ３ +TiO ２ ) / Nb ２ O ５ is 0.05 to 0.25, and more preferably (WO ３ +TiO ２ ) / Nb ２ O ５ is 0.05 to 0.2, and more preferably (WO ３ +TiO ２ ) / Nb ２ O ５ The value is between 0.07 and 0.

17. 10) ZnO / TiO ２ The ratio is 3.0 or less, preferably ZnO / TiO ２ The ratio is 0.01 to 2.0, and more preferably ZnO / TiO ２ The ratio is 0.1 to 1.5, and more preferably ZnO / TiO ２ The value must be between 0.2 and 0.

8. 11) TiO ２ The / BaO ratio is 0.2 to 8.0, preferably TiO ２ The ratio of BaO is 0.3-5.0, and more preferably TiO ２ The / BaO ratio is 0.5 to 3.0, and more preferably TiO ２ The BaO content should be between 0.6 and 1.

5. 12) ZnO / (Na ２ O+TiO ２ ) is 2.0 or less, preferably ZnO / (Na ２ O+TiO ２ ) is 0.01 to 1.5, more preferably ZnO / (Na ２ O+TiO ２ ) is 0.05 to 0.8, and more preferably ZnO / (Na ２ O+TiO ２ ) is between 0.05 and 0.

4. 13) TiO ２ The CaO content is 0.5 to 10.0, preferably TiO ２ The ratio of CaO is 1.0 to 8.0, and more preferably TiO ２ The / CaO content is 2.0 to 7.0, and more preferably TiO ２ / Satisfying one or more of the following 13 conditions: CaO content is between 2.5 and 6.0, The Ln ２ O ３ La ２ O ３ , Gd ２ O ３ , Y ２ O ３ Yb ２ O ３ Lu ２ O ３ The optical glass according to any one of claims 1 to 3, characterized in that it is one or more of the types found therein.

5. When the composition is expressed as a percentage by weight, P ２ O ５ : 20% to 30%, preferably P ２ O ５ : 22% to 28%, and / or Nb ２ O ５ : 45% to 55%, preferably Nb ２ O ５ : 46% to 53%, and / or TiO ２ : 3% to 10%, preferably TiO ２ : 4% to 8%, and / or BaO: 2% to 12%, preferably BaO: 3% to 9%, and / or Na ２ O: 3% to 12%, preferably Na ２ O: 6% to 10%, and / or CaO: greater than 0% and 6% or less, preferably CaO: 1% to 4%, and / or MgO: 0% to 3%, preferably MgO: 0% to 1%, and / or SrO: 0% to 3%, preferably SrO: 0% to 1%, and / or ZnO: greater than 0% and 6% or less, preferably ZnO: 1% to 4%, and / or Li ２ O: 0-3%, preferably Li ２ O: 0-1%, and / or K ２ O: 0-3%, preferably K ２ O: 0-1%, and / or Ln ２ O ３ : 0-3%, preferably Ln ２ O ３ : 0-1%, and / or SiO ２ : 0-3%, preferably SiO ２ : 0-1%, and / or B ２ O ３ : 0-3%, preferably B ２ O ３ : 0-1%, and / or Al ２ O ３ : 0-2%, preferably Al ２ O ３ : 0-1%, and / or WO ３ : 0-2%, preferably WO ３ : 0-1%, and / or ZrO ２ : 0-3%, preferably ZrO ２ : 0-1%, and / or Bi ２ O ３ : 0-2%, preferably Bi ２ O ３ : 0-1%, and / or TeO ２ : 0-3%, preferably TeO ２ The Ln contains 0-1%, and / or 0-0.5%, preferably 0-0.1%, of the Ln ２ O ３ La ２ O ３ , Gd ２ O ３ , Y ２ O ３ Yb ２ O ３ Lu ２ O ３ It is one or more of the following, and the clarifying agent is Sb ２ O ３ , SnO ２ , CEO ２ The optical glass according to any one of claims 1 to 3, characterized in that it is one or more of the types found therein.

6. The composition does not contain MgO and / or SrO and / or Li ２ It does not contain O, and / or K ２ O-free and / or Ln ２ O ３ It does not contain and / or B ２ O ３ It does not contain and / or Al ２ O ３ Does not contain and / or WO ３ It does not contain and / or ZrO ２ It does not contain and / or Bi ２ O ３ It does not contain and / or TeO ２ It does not contain and / or contains a clarifying agent, and the Ln ２ O ３ La ２ O ３ , Gd ２ O ３ , Y ２ O ３ Yb ２ O ３ Lu ２ O ３ One or more of the above, and the clarifying agent is Sb ２ O ３ , SnO ２ , CEO ２ The optical glass according to any one of claims 1 to 3, characterized in that it is one or more of the types found therein.

7. The refractive index n of the optical glass ｄ The value is 1.86 to 1.93, preferably 1.87 to 1.92, more preferably 1.88 to 1.91, and the Abbe number ν ｄ The optical glass according to any one of claims 1 to 3, characterized in that the ratio is 16 to 24, preferably 17 to 23, and more preferably 18 to 22.

8. The thermal expansion coefficient α of the optical glass １００／３００℃ 95 x 10 －７ / K or less, preferably 90 × 10 －７ It is less than or equal to / K, and more preferably 85 × 10 －７ / K or less, and / or acid resistance stability D Ａ The water resistance stability is Class D, which is Class 2 or higher, preferably Class 1, and / or Class D. Ｗ There are two or more classes, preferably one class, and / or relative partial dispersion P ｇ，Ｆ The value is 0.58 to 0.72, preferably 0.60 to 0.68, more preferably 0.63 to 0.66, and / or the relative partial variance deviation ΔP ｇ，Ｆ The value is 0.08 or less, preferably 0.01 to 0.06, more preferably 0.02 to 0.05, and / or the transition temperature T is 0.08 or less. ｇ The temperature is 670°C or lower, preferably 660°C or lower, more preferably 650°C or lower, and / or the degree of wear F Ａ The density ρ is 230 to 270, preferably 240 to 265, more preferably 245 to 260, and / or the density ρ is 3.90 g / cm³. ３ The following, preferably 3.80 g / cm³ ３ The following, and more preferably 3.70 g / cm³ ３ The following and / or λ ７０ The wavelength is 440 nm or less, preferably λ ７０ λ is 430 nm or less, and more preferably, ７０ The wavelength is 425 nm or less, and / or λ ５ The wavelength is 400 nm or less, preferably λ ５ λ is 390 nm or less, and more preferably, ５ The wavelength is 385 nm or less, and / or the weather resistance CR is class 2 or higher, preferably class 1, and / or the Young's modulus E is 8000 × 10⁻¹⁴. ７ The pressure is Pa or higher, preferably 9000 × 10 ７ Pa or higher, more preferably 9500 × 10 ７ The pressure is Pa or higher, and / or the degree of bubbles is level A or higher, preferably level A ０ That is all, more preferably Level A ００ The optical glass according to any one of claims 1 to 3, characterized in that it is the optical glass described in any one of claims 1 to 3.

9. A glass preform characterized by being manufactured from the optical glass described in any one of claims 1 to 8.

10. An optical element characterized by being manufactured from the optical glass described in any one of claims 1 to 8, or from the glass preform described in claim 9.

11. An optical device characterized by containing the optical glass described in any one of claims 1 to 8, or containing the optical element described in claim 10.

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