Optical glass, optical element, and optical instrument

Abstract

The present invention provides an optical glass, comprises the following components in percentage by weight: P2O5: 16-33%; Nb2O5: 40-55%; TiO2: 1-13%; BaO: 1-15%; and Na2O: 0.5-15%. By means of rational component design, the optical glass obtained by the present invention has excellent intrinsic quality while having a desired refractive index and Abbe number, and can be used for high-performance optical instruments.

Description

Optical glass, 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 1.86-1.93 and an Abbe number of 16-24, and optical elements and optical instruments made of the same. Background Art

[0002] In recent years, the rapid development of optoelectronic information, digital display, surveillance and security, and automotive imaging has necessitated miniaturization, lightweighting, and high performance requirements for optical components used in optical systems. High-refractive-index, high-dispersion optical glass can be coupled with low-dispersion optical glass to effectively eliminate chromatic aberration and secondary spectra. This effectively shortens the overall optical length of lenses and miniaturizes imaging systems, resulting in a broad range of applications. At the same radius of curvature, glass with a higher refractive index produces a larger imaging field of view, which helps reduce the number of optical components in optical instruments. With the trend toward miniaturization of optical instruments, the demand for high-refractive-index glass is becoming increasingly pronounced.

[0003] Chinese patent CN101792258A discloses a high-refractive, high-dispersion optical glass with a refractive index of 1.70 to 2.20 and an Abbe number of 10 to 40. The glass contains 40 to 85 mol% TeO2. However, due to the large amount of TeO2 contained in the glass, it is prone to volatilization streaks during production, which is not conducive to the formation of optical glass with excellent intrinsic quality. Chinese patent CN1204073C discloses a high-refractive, high-dispersion optical glass with a refractive index of 1.88 or higher and an Abbe number of 22 to 28. The glass contains 15 to 25 wt% SiO2, but its 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 excellent intrinsic quality, a refractive index of 1.86-1.93 and an Abbe number of 16-24.

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

[0007] The optical glass comprises, expressed in weight percentage, 16-33% of P2O5, 40-55% of Nb2O5, 1-13% of TiO2, 1-15% of BaO, and 0.5-15% of Na2O.

[0008] Furthermore, the optical glass, expressed in weight percentage, further comprises: 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%; and / or WO3: 0-3%; and / or ZrO2: 0-5%; and / or Bi2O3: 0-3%; and / or TeO2: 0-5%; 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, consists of 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%; B2O3: 0~5%; Al2O3: 0~3%; WO3: 0~3%; ZrO2: 0~5%; Bi2O3: 0~3%; TeO2: 0~5%; 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.

[0010] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (B2O3+WO3+Bi2O3) / ZnO is less than 2.0, preferably (B2O3+WO3+Bi2O3) / ZnO is less than 1.0, more preferably (B2O3+WO3+Bi2O3) / ZnO is less than 0.5, and further preferably (B2O3+WO3+Bi2O3) / ZnO is less than 0.2.

[0011] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: ZnO / BaO is less than 3.0, preferably ZnO / BaO is 0.05-2.0, more preferably ZnO / BaO is 0.1-1.5, and further preferably ZnO / BaO is 0.2-0.8.

[0012] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (B2O3+Li2O+K2O) / ZnO is less than 2.0, preferably (B2O3+Li2O+K2O) / ZnO is less than 1.0, more preferably (B2O3+Li2O+K2O) / ZnO is less than 0.5, and further preferably (B2O3+Li2O+K2O) / ZnO is less than 0.2.

[0013] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (P2O5+BaO) / (ZnO+CaO) is greater than 2.0, preferably (P2O5+BaO) / (ZnO+CaO) is 3.0~20.0, more preferably (P2O5+BaO) / (ZnO+CaO) is 5.0~15.0, and further preferably (P2O5+BaO) / (ZnO+CaO) is 8.0~12.0.

[0014] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (Na2O+K2O) / Nb2O5 is 0.05~0.45, preferably (Na2O+K2O) / Nb2O5 is 0.1~0.4, more preferably (Na2O+K2O) / Nb2O5 is 0.1~0.3, and further preferably (Na2O+K2O) / Nb2O5 is 0.1~0.25.

[0015] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (BaO+K2O+ZnO) / (Na2O+CaO) is 0.1~8.0, preferably (BaO+K2O+ZnO) / (Na2O+CaO) is 0.2~5.0, more preferably (BaO+K2O+ZnO) / (Na2O+CaO) is 0.3~2.5, and further preferably (BaO+K2O+ZnO) / (Na2O+CaO) is 0.5~1.5.

[0016] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (TiO2+K2O) / P2O5 is 0.05~0.8, preferably (TiO2+K2O) / P2O5 is 0.1~0.6, more preferably (TiO2+K2O) / P2O5 is 0.1~0.5, and further preferably (TiO2+K2O) / P2O5 is 0.15~0.4.

[0017] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is less than 0.8, preferably (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is less than 0.5, more preferably (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is less than 0.3, and further preferably (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is less than 0.1, and the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3.

[0018] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: (WO3+TiO2) / Nb2O5 is 0.02~0.3, preferably (WO3+TiO2) / Nb2O5 is 0.05~0.25, more preferably (WO3+TiO2) / Nb2O5 is 0.05~0.2, and further preferably (WO3+TiO2) / Nb2O5 is 0.07~0.17.

[0019] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: ZnO / TiO2 is less than 3.0, preferably ZnO / TiO2 is 0.01-2.0, more preferably ZnO / TiO2 is 0.1-1.5, and further preferably ZnO / TiO2 is 0.2-0.8.

[0020] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: TiO2 / BaO is 0.2-8.0, preferably TiO2 / BaO is 0.3-5.0, more preferably TiO2 / BaO is 0.5-3.0, and further preferably TiO2 / BaO is 0.6-1.5.

[0021] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: ZnO / (Na2O+TiO2) is less than 2.0, preferably ZnO / (Na2O+TiO2) is 0.01~1.5, more preferably ZnO / (Na2O+TiO2) is 0.05~0.8, and further preferably ZnO / (Na2O+TiO2) is 0.05~0.4.

[0022] Furthermore, the components of the optical glass are expressed in weight percentage, wherein: TiO2 / CaO is 0.5-10.0, preferably TiO2 / CaO is 1.0-8.0, more preferably TiO2 / CaO is 2.0-7.0, and further preferably TiO2 / CaO is 2.5-6.0.

[0023] Furthermore, the optical glass, wherein the components are expressed in weight percentage, wherein: 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 Na2O: 6-10%; 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: 0-3%, preferably SrO: 0-1%; and / or ZnO: greater than 0 but less than or equal to 6%, preferably ZnO: 1-4%; 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: 0-3%, preferably ZrO2: 0-1%; and / or Bi2O3: 0-2%, preferably Bi2O3: 0-1%; and / or TeO2: 0-3%, preferably TeO2: 0-1%; and / or clarifier: 0-0.5%, preferably clarifier: 0-0.1%, 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 optical glass does not contain MgO, SrO, Li2O, K2O, Ln2O3, B2O3, Al2O3, WO3, ZrO2, Bi2O3, TeO2, or any other clarifier, 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.

[0025] Furthermore, the refractive index n of the optical glass is d 1.86 to 1.93, preferably 1.87 to 1.92, more preferably 1.88 to 1.91; Abbe number ν d It is 16-24, preferably 17-23, and more preferably 18-22.

[0026] Furthermore, the thermal expansion coefficient of the optical glass is 100 / 300℃ 95×10 -7 / K or less, preferably 90×10 -7 / K or less, more preferably 85×10 -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 0.63 to 0.66; and / or relative partial dispersion deviation value 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 670°C or less, preferably 660°C or less, more preferably 650°C or less; and / or wear degree F A 230 to 270, preferably 240 to 265, more preferably 245 to 260; and / or density ρ is 3.90 g / cm 3 Below, preferably 3.80g / cm 3 Below, more preferably 3.70g / cm 3 Below; and / or 70 440nm or less, preferably λ 70 430nm or less, more preferably λ 70 is 425nm or less; and / or λ5 is 400nm or less, preferably λ5 is 390nm or less, more preferably λ5 is 385nm 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 9000×10 7 Pa or more, more preferably 9500×10 7 Pa or more; and / or the bubble degree is A grade or more, preferably A0 grade or more, more preferably A 00 class.

[0027] The glass preform is made of the above-mentioned optical glass.

[0028] The optical element is made of the above optical glass, or made of the above glass preform.

[0029] An optical instrument containing the above-mentioned optical glass or the above-mentioned optical element.

[0030] The beneficial effects of the present invention are as follows: through reasonable component design, the optical glass obtained by the present invention has a desired refractive index and Abbe number and at the same time has excellent intrinsic quality, meeting the requirements for use in high-performance optical instruments. DETAILED DESCRIPTION

[0031] 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."

[0032] [Optical glass]

[0033] 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%.

[0034] 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.

[0035] <Essential Components and Optional Components>

[0036] 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 16-33%, preferably 20-30%, and more preferably 22-28%.

[0037] 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 40% Nb2O5. The preferred lower limit for the Nb2O5 content is 45%, and more preferably 46%. If the Nb2O5 content exceeds 55%, the thermal and chemical stability of the glass decreases, and the light transmittance falls. Therefore, the upper limit of the Nb2O5 content in the present invention is 55%, and preferably 53%.

[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 13%, preferably 3 to 10%, and more preferably 4 to 8%.

[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 1% or more of BaO. Preferably, the BaO content is 2% or more, and more preferably, 3% or more. Meanwhile, by limiting the BaO content to 15% or less, the reduction in chemical stability caused by excessive BaO content can be prevented. Therefore, the BaO content is 15% or less, preferably 12% or less, and more preferably 9% or less.

[0040] In some embodiments, controlling the ratio of TiO2 to BaO (TiO2 / BaO) within a range of 0.2 to 8.0 is beneficial for improving the chemical stability of the glass and reducing 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 a range of 0.5 to 3.0 can further optimize the abrasiveness of the glass, making it easier for the glass to obtain the desired P g,F Value and ΔP g,F Therefore, it is more preferred that TiO2 / BaO is 0.5 to 3.0, and it is further preferred that TiO2 / BaO is 0.6 to 1.5.

[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 0.5 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 0.5 to 10.0, more preferably 1.0 to 8.0, further preferably 2.0 to 7.0, and even more preferably 2.5 to 6.0.

[0043] SrO can adjust the refractive index and dispersion of glass, but excessive SrO content can reduce the chemical stability of the glass and increase its cost. Therefore, the SrO content is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, SrO is preferably absent.

[0044] 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.

[0045] 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 0-8%, preferably greater than 0 but less than or equal to 6%, and more preferably 1-4%.

[0046] In some embodiments, controlling the ratio of ZnO content to the total content of Na2O and TiO2 (Na2O+TiO2) (ZnO / (Na2O+TiO2)) to below 2.0 can improve the bubble content of the glass while preventing the glass transition temperature from rising. Therefore, ZnO / (Na2O+TiO2) is preferably below 2.0, and more preferably ZnO / (Na2O+TiO2) is 0.01 to 1.5. Furthermore, controlling ZnO / (Na2O+TiO2) to within the range of 0.05 to 0.8 can further optimize the abrasion resistance and weather resistance of the glass. Therefore, ZnO / (Na2O+TiO2) is more preferably 0.05 to 0.8, and even more preferably ZnO / (Na2O+TiO2) is 0.05 to 0.4.

[0047] In some embodiments, the ratio of the total content of P2O5 and BaO (P2O5+BaO) to the total content of ZnO and CaO (ZnO+CaO) (P2O5+BaO) / (ZnO+CaO) is controlled to be above 2.0, which can improve the light transmittance of the glass while preventing the transition temperature from deteriorating. Therefore, it is preferred that (P2O5+BaO) / (ZnO+CaO) is above 2.0, and more preferably (P2O5+BaO) / (ZnO+CaO) is 3.0-20.0. Furthermore, by controlling (P2O5+BaO) / (ZnO+CaO) within the range of 5.0-15.0, the Young's modulus and bubble degree of the glass can be further optimized. Therefore, it is further preferred that (P2O5+BaO) / (ZnO+CaO) is 5.0-15.0, and it is even more preferred that (P2O5+BaO) / (ZnO+CaO) is 8.0-12.0.

[0048] In some embodiments, controlling the ZnO / BaO ratio (ZnO / BaO) below 3.0 helps improve the weather resistance of the glass. Therefore, a ZnO / BaO ratio of 3.0 or less is preferred. Furthermore, controlling the ZnO / BaO ratio within a range of 0.05 to 2.0 can also optimize the abrasiveness of the glass while lowering the transition temperature. Therefore, a ZnO / BaO ratio of 0.05 to 2.0 is more preferred, 0.1 to 1.5 is even more preferred, and 0.2 to 0.8 is even more preferred.

[0049] In some embodiments, controlling the ratio of ZnO to TiO2 (ZnO / TiO2) to below 3.0 can optimize the abrasiveness and chemical stability of the glass and prevent an increase in the glass transition temperature. Therefore, the ZnO / TiO2 ratio is preferably below 3.0, more preferably 0.01 to 2.0, further preferably 0.1 to 1.5, and even more preferably 0.2 to 0.8.

[0050] 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.

[0051] 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 0.5-15%, preferably 3-12%, and more preferably 6-10%.

[0052] 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.

[0053] In some embodiments, the ratio of the total content of Na2O and K2O (Na2O+K2O) to the content of Nb2O5 (Na2O+K2O) / Nb2O5 is controlled within the range of 0.05 to 0.45, which is beneficial for the glass to obtain high refractive index, high dispersion and desired P g,F Value and ΔP g,F Therefore, the (Na2O+K2O) / Nb2O5 ratio is preferably 0.05 to 0.45, more preferably 0.1 to 0.4, further preferably 0.1 to 0.3, and even more preferably 0.1 to 0.25.

[0054] In some embodiments, the ratio of the total content of TiO2 and K2O (TiO2+K2O) to the content of P2O5 ((TiO2+K2O) / P2O5)) is controlled within the range of 0.05 to 0.8, so that the glass has the desired P g,F Value and ΔP g,F Therefore, the ratio of (TiO2+K2O) / P2O5 is preferably 0.05 to 0.8, more preferably 0.1 to 0.6, further preferably 0.1 to 0.5, and even more preferably 0.15 to 0.4.

[0055] 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.

[0056] 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%.

[0057] 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.

[0058] In some embodiments, the ratio of the total content of B2O3, Li2O and K2O (B2O3+Li2O+K2O) to the content of ZnO (B2O3+Li2O+K2O) / ZnO is controlled to be below 2.0, so that the glass can obtain the desired P g,F Value and ΔP g,F The glass is characterized by a low molecular weight, low molecular weight, and low molecular weight. ... Therefore, the ratio (B2O3+Li2O+KO2O) / ZnO is preferably 2.0 or less, more preferably 1.0 or less, further preferably 0.5 or less, and even more preferably 0

[0059] In some embodiments, the ratio of the combined content of BaO, KO, and ZnO (BaO+KO+ZnO) to the combined content of NaO and CaO (NaO+CaO) (BaO+KO+ZnO) / (NaO+CaO) is within a range of 0.1 to 8.0, which helps reduce the density and thermal expansion coefficient of the glass. Therefore, (BaO+KO+ZnO) / (NaO+CaO) is preferably 0.1 to 8.0, and more preferably (BaO+KO+ZnO) / (NaO+CaO) is 0.2 to 5.0. Furthermore, controlling (BaO+KO+ZnO) / (NaO+CaO) within a range of 0.3 to 2.5 can further optimize the abrasion resistance and weather resistance of the glass. Therefore, it is more preferred that (BaO+K2O+ZnO) / (Na2O+CaO) is 0.3 to 2.5, and it is further preferred that (BaO+K2O+ZnO) / (Na2O+CaO) is 0.5 to 1.5.

[0060] 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.

[0061] 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.

[0062] In some embodiments, controlling the ratio of the combined content of WO3 and TiO2 (WO3+TiO2) to the content of Nb2O5 ((WO3+TiO2) / Nb2O5)) within the range of 0.02 to 0.3 is beneficial for reducing the density of the glass and optimizing the Young's modulus and abrasiveness of the glass. Therefore, (WO3+TiO2) / Nb2O5 is preferably 0.02 to 0.3, more preferably (WO3+TiO2) / Nb2O5 is 0.05 to 0.25, further preferably (WO3+TiO2) / Nb2O5 is 0.05 to 0.2, and even more preferably (WO3+TiO2) / Nb2O5 is 0.07 to 0.17.

[0063] 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 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, ZrO2 is further preferably absent.

[0064] 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.

[0065] In some embodiments, the ratio of the total content of B2O3, WO3 and Bi2O3 (B2O3+WO3+Bi2O3) to the content of ZnO (B2O3+WO3+Bi2O3) / ZnO is controlled to be below 2.0, which is beneficial for the glass to obtain the desired P g,F Value and ΔP g,FWhile optimizing the glass's light transmittance and bubble content, the glass's density is prevented from increasing. Therefore, the ratio (B2O3+WO3+Bi2O3) / ZnO is preferably 2.0 or less, more preferably 1.0 or less, further preferably 0.5 or less, and even more preferably 0.2 or less.

[0066] In some embodiments, 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 is controlled to be below 0.8, and the glass has a desired P g,F Value and ΔP g,F While optimizing the chemical stability and bubble content of the glass, the ratio of (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is preferably 0.8 or less, more preferably (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is 0.5 or less, further 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.

[0067] TeO2 is an optional component that increases the refractive index of glass and lowers its transition temperature. Excessive TeO2 content can react with platinum, reducing its lifespan, leading to the ingress of platinum particles into the glass, reducing its transmittance, and causing volatilization streaks, which can reduce 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 preferably absent.

[0068] 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.

[0069] <Components that should not be contained>

[0070] 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.

[0071] 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.

[0072] In order to achieve environmental friendliness, the optical glass of the present invention preferably does not contain As2O3 and PbO.

[0073] 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.

[0074] Next, the properties of the optical glass of the present invention will be described.

[0075] <Refractive Index and Abbe Number>

[0076] 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.

[0077] In some embodiments, the refractive index (n d ) is 1.86, preferably 1.87, and more preferably 1.88.

[0078] In some embodiments, the refractive index (n d ) is 1.93, preferably 1.92, and more preferably 1.91.

[0079] In some embodiments, the Abbe number (ν d ) is 16, preferably 17, and more preferably 18.

[0080] In some embodiments, the Abbe number (ν d ) is 24, preferably 23, and more preferably 22.

[0081] <Coefficient of Thermal Expansion>

[0082] 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.

[0083] In some embodiments, the thermal expansion coefficient (α 100 / 300℃ ) is 95×10 -7 / K or less, preferably 90×10 -7 / K or less, more preferably 85×10 -7 / K or less.

[0084] <Acid resistance stability>

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

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

[0087] <Water resistance stability>

[0088] Water resistance stability of optical glass (D W ) (Powder method) Tested in accordance with the method specified in GB / T 17129.

[0089] In some embodiments, the water resistance stability (D W ) is 2 or more types, preferably 1 type.

[0090] <Relative Partial Dispersion and Relative Partial Dispersion Deviation Value>

[0091] The relative partial dispersion (P g,F ) and relative partial dispersion deviation (ΔP g,F ) origin.

[0092] The relative partial dispersion for wavelengths x and y is expressed by the following equation (1): x,y =(n x -n y ) / (n F -n C ) (1)

[0093] 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)

[0094] 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.

[0095] 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 ΔPx,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)

[0096] Therefore, ΔP x,y It quantitatively expresses the deviation characteristics of special dispersion compared with "normal glass".

[0097] 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)

[0098] In some embodiments, the relative partial dispersion (P g,F ) is 0.58, preferably 0.60, and more preferably 0.63.

[0099] In some embodiments, the relative partial dispersion (P g,F ) has an upper limit of 0.72, a preferred upper limit of 0.68, and a more preferred upper limit of 0.66.

[0100] In some embodiments, the relative partial dispersion deviation value (ΔP g,F ) is 0.01, and the preferred lower limit is 0.02.

[0101] In some embodiments, the relative partial dispersion deviation value (ΔP g,F ) is 0.08, preferably 0.06, and more preferably 0.05.

[0102] <Transition Temperature>

[0103] Transition temperature of optical glass (T g ) Test according to the method specified in GB / T7962.16-2010.

[0104] In some embodiments, the transition temperature (T g ) is 670°C or lower, preferably 660°C or lower, more preferably 650°C or lower.

[0105] <Abrasion>

[0106] 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

[0107] Where: V—volume wear of the sample being tested;

[0108] V0—volume wear of standard sample;

[0109] W—mass wear loss of the sample being tested;

[0110] W0—mass wear of standard sample;

[0111] ρ—density of the sample being measured;

[0112] ρ0—density of standard sample.

[0113] In some embodiments, the abrasiveness (F A ) has a lower limit of 230, a preferred lower limit of 240, and a more preferred lower limit of 245.

[0114] In some embodiments, the abrasiveness (F A ) has an upper limit of 270, a preferred upper limit of 265, and a more preferred upper limit of 260.

[0115] <density>

[0116] Density (ρ) is tested according to the method specified in GB / T7962.20-2010.

[0117] In some embodiments, the density (ρ) of the optical glass of the present invention is 3.90 g / cm 3 Below, preferably 3.80g / cm 3 Below, more preferably 3.70g / cm 3 the following.

[0118] <Color>

[0119] 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.

[0120] In some embodiments, the λ of the optical glass of the present invention is 70 440nm or less, preferably λ 70 430nm or less, more preferably λ 70 Below 425nm.

[0121] 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 385 nm or less.

[0122] Weather resistance

[0123] 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:

[0124] Table 1.

[0125] In some embodiments, the weather resistance (CR) of the optical glass of the present invention is Class 2 or higher, preferably Class 1.

[0126] <Young's modulus>

[0127] Young's modulus (E) is calculated using the following formula using ultrasonic testing of its longitudinal wave velocity and shear wave velocity. G=VS 2 ρ

[0128] Where: E is Young's modulus, Pa;

[0129] G is the shear modulus, Pa;

[0130] V T is the shear wave velocity, m / s;

[0131] V S is the longitudinal wave velocity, m / s;

[0132] ρ is the density of glass, g / cm 3 .

[0133] In some embodiments, the Young's modulus (E) of the optical glass of the present invention is 8000×10 7 Pa or more, preferably 9000×10 7 Pa or more, more preferably 9500×10 7 Pa and above.

[0134] <Bubble Degree>

[0135] The bubble degree of optical glass is tested according to the method specified in GB / T7962.8-2010.

[0136] 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.

[0137] [Method for manufacturing optical glass]

[0138] 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.

[0139] [Glass preforms and optical components]

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] [Optical Instruments]

[0145] 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.

[0146] Example

[0147] <Optical Glass Example>

[0148] In order to further clearly illustrate and describe the technical solutions of the present invention, the following non-limiting examples are provided.

[0149] 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.

[0150] Table 2.

[0151] Table 3.

[0152] Table 4.

[0153] <Glass Preform Example>

[0154] 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.

[0155] <Optical Element Example>

[0156] 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.

[0157] 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.

[0158] <Optical Instrument Example>

[0159] 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 are expressed in weight percentage and contain: P2O5: 16-33%; Nb2O5: 40-55%; TiO2: 1-13%; BaO: 1-15%; Na2O: 0.5-15%.

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: 0-5%; 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%; and / or WO3: 0-3%; and / or ZrO2: 0-5%; and / or Bi2O3: 0-3%; and / or TeO2: 0-5%; 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: 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%; B2O3: 0~5%; Al2O3: 0~3%; WO3: 0~3%; ZrO2: 0~5%; Bi2O3: 0~3%; TeO2: 0~5%; Clarifier: 0-1% composition, the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, Lu2O3, and the clarifier is one or more of Sb2O3, SnO2, 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 13 conditions: 1) (B2O3+WO3+Bi2O3) / ZnO is less than 2.0, preferably (B2O3+WO3+Bi2O3) / ZnO is less than 1.0, more preferably (B2O3+WO3+Bi2O3) / ZnO is less than 0.5, and further preferably (B2O3+WO3+Bi2O3) / ZnO is less than 0.2; 2) ZnO / BaO is 3.0 or less, preferably ZnO / BaO is 0.05 to 2.0, more preferably ZnO / BaO is 0.1 to 1.5, and further preferably ZnO / BaO is 0.2 to 0.8; 3) (B2O3+Li2O+K2O) / ZnO is less than 2.0, preferably (B2O3+Li2O+K2O) / ZnO is less than 1.0, more preferably (B2O3+Li2O+K2O) / ZnO is less than 0.5, and further preferably (B2O3+Li2O+K2O) / ZnO is less than 0.2; 4) (P2O5+BaO) / (ZnO+CaO) is 2.0 or more, preferably (P2O5+BaO) / (ZnO+CaO) is 3.0 to 20.0, more preferably (P2O5+BaO) / (ZnO+CaO) is 5.0 to 15.0, and further preferably (P2O5+BaO) / (ZnO+CaO) is 8.0 to 12.0; 5) (Na2O+K2O) / Nb2O5 is 0.05 to 0.45, preferably (Na2O+K2O) / Nb2O5 is 0.1 to 0.4, more preferably (Na2O+K2O) / Nb2O5 is 0.1 to 0.3, and further preferably (Na2O+K2O) / Nb2O5 is 0.1 to 0.25; 6) (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 further preferably (BaO + K2O + ZnO) / (Na2O + CaO) is 0.5 to 1.5; 7) (TiO2+K2O) / P2O5 is 0.05-0.8, preferably (TiO2+K2O) / P2O5 is 0.1-0.6, more preferably (TiO2+K2O) / P2O5 is 0.1-0.5, and further preferably (TiO2+K2O) / P2O5 is 0.15-0.4; 8) (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is less than 0.8, preferably (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is less than 0.5, more preferably (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is less than 0.3, and further preferably (Ln2O3+Li2O+K2O+WO3+Bi2O3) / TiO2 is less than 0.1; 9) (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 further preferably (WO3+TiO2) / Nb2O5 is 0.07 to 0.17; 10) ZnO / TiO2 is less than 3.0, preferably ZnO / TiO2 is 0.01 to 2.0, more preferably ZnO / TiO2 is 0.1 to 1.5, and further preferably ZnO / TiO2 is 0.2 to 0.8; 11) TiO2 / BaO is 0.2 to 8.0, preferably TiO2 / BaO is 0.3 to 5.0, more preferably TiO2 / BaO is 0.5 to 3.0, and further preferably TiO2 / BaO is 0.6 to 1.5; 12) ZnO / (Na2O+TiO2) is less than 2.0, preferably ZnO / (Na2O+TiO2) is 0.01 to 1.5, more preferably ZnO / (Na2O+TiO2) is 0.05 to 0.8, and further preferably ZnO / (Na2O+TiO2) is 0.05 to 0.4; 13) TiO2 / CaO is 0.5 to 10.0, preferably TiO2 / CaO is 1.0 to 8.0, more preferably TiO2 / CaO is 2.0 to 7.0, and further preferably TiO2 / CaO is 2.5 to 6.

0. The Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3.

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: 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 Na2O: 6-10%; and / or 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: 0-3%, preferably SrO: 0-1%; and / or ZnO: greater than 0 but less than or equal to 6%, preferably ZnO: 1-4%; 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: 0-3%, preferably ZrO2: 0-1 %; and / or Bi2O3: 0-2%, preferably Bi2O3: 0-1%; and / or TeO2: 0-3%, preferably TeO2: 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, and 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 SrO; 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 TeO2; 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 1.86 to 1.93, preferably 1.87 to 1.92, more preferably 1.88 to 1.91; Abbe number ν d It is 16-24, preferably 17-23, and more preferably 18-22.

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℃ 95×10 -7 / K or less, preferably 90×10 -7 / K or less, more preferably 85×10 -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 0.63 to 0.66; and / or relative partial dispersion deviation value 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 670°C or less, preferably 660°C or less, more preferably 650°C or less; and / or abrasion degree F A 230 to 270, preferably 240 to 265, more preferably 245 to 260; and / or density ρ is 3.90 g / cm 3 Below, preferably 3.80g / cm 3 Below, more preferably 3.70g / cm 3 Below; and / or 70 440nm or less, preferably λ 70 430nm or less, preferably λ 70 is 425nm or less; and / or λ5 is 400nm or less, preferably λ5 is 390nm or less, more preferably λ5 is 385nm 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 9000×10 7 Pa or more, more preferably 9500×10 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.

Images