Optical glass, optical components, and optical instruments

Abstract

To provide an optical glass that has a lower transition temperature and a lower density while having a desired refractive index and a desired Abbe number.SOLUTION: The present invention provides an optical glass that includes the following components, in percentage by weight: 50-70% of SiO2, 2-18% of B2O3, 10-30% of K2O, and more than 3% to 20% or less of F, where SiO2 / (K2O+F) is 1.2-4.5.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to optical glass, and particularly to optical glass having a refractive index of 1.45 to 1.51 and an Abbe number of 66 to 74, as well as optical components and optical devices manufactured therefrom.

Background Art

[0002] In recent years, with the development of optoelectronic information, digital displays, etc., miniaturization, weight reduction, and high performance of optical components used in optical systems have been demanded. Currently, the manufacturing methods of optical components mainly include precision molding methods such as direct press molding method and secondary press molding method, which can reduce raw material consumption, labor costs and material costs, and reduce environmental pollution. With this technology, aspherical components can be mass-produced at low cost. So-called precision pressing means that a glass preform is pressed with a high-precision mold of a predetermined product shape at a certain temperature and pressure to obtain a glass product having the final product shape and optical function. Various optical components such as spherical lenses, aspherical lenses, prisms, diffraction gratings, etc. can be manufactured by the precision pressing technology.

[0003] When performing precision pressing molding, in order to transfer the high-precision mold surface to the completed glass product, it is necessary to press the glass preform at a high temperature (usually 20 to 60 °C or more above the glass transition temperature). In this case, the surface of the molding mold is easily oxidized and eroded even in a protective gas under high temperature and pressure. In order to extend the life of the mold and suppress the damage of the mold due to the high-temperature environment, it is necessary to lower the molding temperature. Therefore, it is necessary to make the transition temperature of the optical glass used for pressing as low as possible. Chinese Patent Application No. CN101300202A discloses optical glass having a refractive index of 1.45 to 1.65 and an Abbe number of 65 or more, and it is necessary to further lower its transition temperature. Chinese Patent Application No. CN108529874A discloses optical glass having a refractive index of 1.42 to 1.53 and an Abbe number of 55 to 98. Although its transition temperature is low, its density is relatively high and it does not meet the requirement of weight reduction.

Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an optical glass with a refractive index of 1.45 to 1.51 and an Abbe number of 66 to 74.

[0005] To solve the technical problem, the present invention uses the following technical solutions.

[0006] (1) An optical glass, the components of which, in weight percentages, include 50 to 70% of SiO2, 2 to 18% of B2O3, 10 to 30% of K2O, and more than 3% to 20% or less of F, and SiO2 / (K2O + F) is 1.2 to 4.5.

[0007] (2) The components of which, in weight percentages, further include 0 to 5% of Al2O3, and / or 0 to 2% of Nb2O5, and / or 0 to 2% of TiO2, and / or 0 to 3% of ZrO2, and / or 0 to 7% of Na2O, and / or 0 to 5% of Li2O, and / or 0 to 5% of Ln2O3, and / or 0 to 2% of WO3, and / or 0 to 3% of Ta2O5, and / or 0 to 2% of Bi2O3, and / or 0 to 8% of RO, and / or 0 to 5% of ZnO, and / or 0 to 3% of P2O5, and / or 0 to 1% of a fining agent. The above Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, RO is one or more of BaO, SrO, CaO, MgO, and the fining agent is one or more of Sb2O3, SnO2, CeO2. The optical glass according to (1).

[0008] (3) An optical glass, the components of which include SiO2, B2O3, K2O and F. The components are represented by weight percentages, SiO2 / (K2O + F) is 1.2 to 4.5, and the refractive index n d of the above optical glass is 1.45 to 1.51, the Abbe number v d is 66 to 74, the transition temperature T g is 490 °C or lower, and the density ρ is 2.70 g / cm 3 or less.

[0009] (4) The components are, by weight percentage, 50-70% SiO2, and / or 2-18% B2O3, and / or 10-30% K2O, and / or 0-2% Nb2O5, and / or 0-2% TiO2, and / or 0-3% ZrO2, and / or more than 3% but less than or equal to 20% F, and / or 0-5% Al2O3, and / or 0-7% Na2O, and / or 0-5% Li2O, and / or 0-5% Ln2O3, and / or 0-2% WO3, and / The optical glass according to (3), comprising 0-3% Ta2O5 and / or 0-2% Bi2O3 and / or 0-8% RO, 0-5% ZnO and / or 0-3% P2O5 and / or 0-1% clarifying agent, wherein Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, and Yb2O3, RO is one or more of BaO, SrO, CaO, and MgO, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0010] (5) The components are expressed as a percentage by weight and satisfy one or more of the following five conditions: 1) The F / B2O3 ratio is 0.2 to 5.0, preferably 0.3 to 2.0, more preferably 0.4 to 1.5, and even more preferably 0.5 to 0.9. 2) Al2O3 / F is 1.0 or less, preferably 0.8 or less, more preferably 0.01 to 0.5, and even more preferably 0.07 to 0.3. 3) The K2O / F ratio is 0.7 to 7.0, preferably 1.0 to 5.0, more preferably 1.5 to 3.0, and even more preferably 1.8 to 2.8. 4) The SiO2 / (K2O+F) ratio is 1.3 to 3.5, preferably 1.5 to 3.0, and more preferably 1.7 to 2.5. 5) The optical glass according to any one of (1) to (4), wherein (ZrO2+Nb2O5+TiO2) / F is 0.01 to 1.0, preferably (ZrO2+Nb2O5+TiO2) / F is 0.01 to 0.8, more preferably (ZrO2+Nb2O5+TiO2) / F is 0.02 to 0.6, and even more preferably (ZrO2+Nb2O5+TiO2) / F is 0.03 to 0.4.

[0011] (6) The components are expressed as weight percentages, and (Nb2O5+TiO2+Bi2O3+Ta2O5+WO3) / B2O3 is greater than 0 and 0.8 or less, preferably (Nb2O5+TiO2+Bi2O3+Ta2O5+WO3) / B2O3 is 0.01 to 0.5, more preferably (Nb2O5+TiO2+Bi2O3+Ta2O5+WO3) / B2O3 is 0.01 to 0.3, and even more preferably , (Nb2O5+TiO2+Bi2O3+Ta2O5+WO3) / B2O3 is 0.02 to 0.2 and / or (Nb2O5+TiO2) / Al2O3 is 2.0 or less, preferably (Nb2O5+TiO2) / Al2O3 is 0.01 to 1.5, more preferably (Nb2O5+TiO2) / Al2O3 is 0.05 to 1.0, even more preferably (Nb2O5+TiO2) / Al2O3 is 0.1 to 0.5, and / or (Li2O+Na2O+K2O) / B2O3 is 0.7 to 6.0, preferably (Li2O+Na2O+K2O) / B2O3 is 0.8 to 5.0, more preferably (Li2O+Na2O+K2O) / B2O3 is 1.0 to 3.0, even more preferably (Li2O+Na2O+K2O) / B2O3 is 1.5 to 2.0, and / or The optical glass according to any one of (1) to (4), wherein the (Li2O+Na2O+K2O) / SiO2 ratio is 0.15 to 0.8, preferably 0.18 to 0.7, more preferably 0.2 to 0.6, and even more preferably 0.2 to 0.45.

[0012] (7) The components are expressed as weight percentages, with SiO2 being 52-68%, preferably 54-64%, and / or B2O3 being 4-16%, preferably 8-14%, and / or K2O being 12-27%, preferably 13-25%, and / or Nb2O5 being 0-1%, preferably 0-0.8%, and / or TiO2 being 0-1%, preferably 0-0 The amount of 0.8% and / or ZrO2 is 0-2%, preferably ZrO2 is 0-1%, and / or F is 5-16%, preferably F is 6-12%, and / or Al2O3 is 0.1-3%, preferably Al2O3 is 0.2-2%, and / or Na2O is 0-5%, preferably Na2O is 0-3%, and / or Li2O is 0-4%, preferably Li2O is 0-3%, and / or Ln2O3 is 0 The total amount is ~3%, preferably Ln2O3 is 0~1%, and / or WO3 is 0~1%, preferably WO3 is 0~0.5%, and / or Ta2O5 is 0~2%, preferably Ta2O5 is 0~1%, and / or Bi2O3 is 0~1%, preferably Bi2O3 is 0~0.5%, and / or RO is 0~5%, preferably RO is 0~2%, and / or ZnO is 0~2%, preferably ZnO is 1 The optical glass according to any one of (1) to (4), wherein the clarifying agent is less than %, and / or P2O5 is 0 to 2%, preferably 0 to 1%, and / or the clarifying agent is 0 to 0.5%, preferably 0 to 0.2%, and the Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, and Yb2O3, RO is one or more of BaO, SrO, CaO, and MgO, and the clarifying agent is one or more of Sb2O3, SnO2, and CeO2.

[0013] (8) The component does not contain Na₂O, and / or does not contain Li₂O, and / or does not contain La₂O₃, and / or does not contain Gd₂O₃, and / or does not contain Y₂O₃, and / or does not contain Yb₂O₃, and / or does not contain ZnO, and / or does not contain P₂O₅, and / or does not contain BaO, and / or does not contain SrO, and / or does not contain CaO, and / or does not contain MgO, and is the optical glass according to any one of (1) to (4).

[0014] (9) The refractive index n of the optical glass d is 1.45 to 1.51, preferably 1.46 to 1.50, more preferably 1.47 to 1.49, and the Abbe number v d is 66 to 74, preferably 68 to 72, more preferably 69 to 71, and is the optical glass according to any one of (1) to (4).

[0015] (10) The transmittance τ of the above optical glass at 365 nm 365nm is 98.0% or more, preferably 99.0% or more, more preferably 99.5% or more, and / or the ultraviolet attenuation resistance performance Δτ of the transmittance at 365 nm 365nm is 1.0% or less, preferably 1.0% or less, more preferably 0.8% or less, and / or the ultraviolet attenuation resistance performance Δτ of the transmittance at 405 nm 405nm is 0.5% or less, preferably 0.3% or less, more preferably 0.2% or less, and / or the bubble degree is Class A or above, preferably Class A0 or above, more preferably Class A 00 class or above, and / or the vein is Class C or above, preferably Class B or above, and / or the weather resistance CR is Class 2 or above, preferably Class 1, and / or the transition temperature T g is 490 °C or less, preferably 480 °C or less, more preferably 475 °C or less, and / or the wear degree F A is 60 to 90, preferably 65 to 85, more preferably 70 to 80, and / or the density ρ is 2.70 g / cm 3The following, preferably 2.60 g / cm³ 3 The following, and more preferably, 2.50 g / cm³ 3 The following applies, and / or the refractive index batch stability is -15 × 10⁻⁶. -5 ~+15×10 -5 Preferably, -10 × 10 -5 ~+10×10 -5 And more preferably, -5 × 10 -5 ~+5×10 -5 And more preferably, -2 × 10 -5 ~+2×10 -5 The optical glass described in any one of items (1) to (4).

[0016] (11) A glass preform, which is manufactured from an optical glass as described in any one of items (1) to (10).

[0017] (12) An optical component which is manufactured from an optical glass as described in any one of items (1) to (10), or from a glass preform as described in (11).

[0018] (13) Optical instrument comprising optical glass as described in any one of items (1) to (10) and / or optical components as described in (12).

[0019] The beneficial effects of the present invention are as follows: Through a rational design of its components, the optical glass of the present invention not only has a desired refractive index and Abbe number, but also a lower transition temperature and density. [Modes for carrying out the invention]

[0020] The embodiments of the optical glass of the present invention will be described in detail below, but 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. While redundant explanations may be omitted as appropriate, this does not limit the gist of the present invention, and in the following description, the optical glass of the present invention may be simply referred to as glass.

[0021] Photolithography lenses in photolithography equipment utilize radiation-resistant optical glass with a refractive index of 1.45–1.51 and an Abbe number of 66–74, and the precision of this glass determines the precision of the lens in the photolithography equipment. Optical components made from ordinary optical glass undergo a significant decrease in transmittance and a change in refractive index after prolonged exposure in the ultraviolet band (355–430 nm), which is fatal for all types of photolithography equipment operating in the ultraviolet band. As chip manufacturing technology and advanced packaging technologies develop toward finer line widths and higher efficiency, photolithography equipment operating in this band requires higher resolution, higher light output, and larger exposure areas. Therefore, optical materials used in such photolithography equipment require larger dimensions, better radiation resistance, transmittance, and optical uniformity. The main problems with this type of optical material in the prior art are as follows: Due to its low UV resistance, the transmittance attenuation can reach 5% under the verification conditions of photolithography equipment, and the low transmittance at 365nm of this type of material makes it difficult to meet the requirements of high-precision photolithography equipment. In some embodiments, the transmittance of the optical glass of the present invention at 365nm (τ 365nm ) is 98.0% or higher, preferably 99.0% or higher, and more preferably 99.5% or higher, and the UV attenuation performance (Δτ) of the transmittance at 365 nm is 98.0% or higher. 365nm ) is 1.0% or less, preferably 0.9% or less, more preferably 0.8% or less, and the UV attenuation performance (Δτ) of transmittance at 405 nm is 405nm The content of the material is 0.5% or less, preferably 0.3% or less, and more preferably 0.2% or less. The optical glass of the present invention can also be used in fields such as chip manufacturing and advanced packaging.

[0022] [Optical glass] The following describes the range of each component (composition) of the optical glass of the present invention. In the present invention, unless otherwise specified, the content of each component and the total content are all expressed as weight percentages (weight %). In the present invention, all components except for the F (fluorine) component are expressed as the sum of the weight percentage of all oxide components in the glass and the weight percentage of the F component in the glass being 100%.

[0023] Unless otherwise indicated in specific cases, the numerical ranges enumerated in this invention include upper and lower limits, and “greater than or equal to” and “less than or equal to” include all integers and fractions that fall within the boundary values ​​and ranges, and are not limited to the specific values ​​enumerated when the range is defined. The terms “and / or” as used herein are inclusive, and for example, “A and / or B” means A only, B only, or both A and B.

[0024] <Essential and Optional Ingredients> SiO2 is the main network-forming component of the glass of the present invention. If the SiO2 content is less than 50%, the transmittance of the glass at 365 nm becomes low, which is fatal for ultraviolet optical systems with long optical paths and high illumination requirements, such as lenses in photolithography equipment and prisms in exposure machines. Therefore, the lower limit of the SiO2 content is 50%, preferably 52%, and more preferably 54%. If the SiO2 content exceeds 70%, the refractive index of the glass becomes difficult to meet the design requirements, and at the same time, the glass needs to be melted at a higher temperature. As the smelting temperature increases, the erosion of the crucible by the glass liquid increases exponentially, the content of ions that have strong absorption in the ultraviolet band, such as iron (Fe) ions and platinum (Pt) ions, increases rapidly, and the transmittance of ultraviolet light, especially at 365 nm, decreases rapidly. In addition, if the SiO2 content is too high, the high-temperature viscosity of the glass becomes too high, making it difficult to meet design requirements such as optical uniformity, bubble degree, and striation. Therefore, the upper limit of the SiO2 content is 70%, preferably 68%, and more preferably 64%.

[0025] An appropriate amount of B2O3 can increase the refractive index of the glass, strengthen its structure, and improve its meltability and UV resistance. If the B2O3 content exceeds 18%, the erosion of the crucible by the glass liquid increases rapidly, and the UV transmittance decreases sharply. If the B2O3 content is less than 2%, the glass becomes difficult to dissolve. Therefore, the B2O3 content is 2-18%, preferably 4-16%, and more preferably 8-14%.

[0026] Al2O3 can increase the density of the internal structure of glass, improving ultraviolet transmittance and the chemical stability of the glass. However, if its content exceeds 5%, it becomes more likely to form stones inside the glass, degrading the internal quality of the glass. Therefore, the Al2O3 content should be 0-5%, preferably 0.1-3%, and more preferably 0.2-2%.

[0027] ZrO2 improves the devitrification resistance of glass, enhances its chemical stability and mechanical properties, reduces erosion of the crucible material during the melting process, and increases the ultraviolet transmittance of glass. If the content is too high, the difficulty of melting the glass increases, the smelting temperature rises, inclusions may form inside the glass, and the light transmittance may decrease. Therefore, the ZrO2 content in this invention is 0 to 3%, preferably 0 to 2%, and more preferably 0 to 1%.

[0028] K2O can improve the thermal stability and meltability of glass, lower the effect of the transition temperature, reduce the high-temperature viscosity of glass, and strengthen the network structure of glass by providing free oxygen, thereby increasing the ultraviolet transmittance of glass. However, if the content is too high, the devitrification resistance and chemical stability of glass will decrease. Therefore, the K2O content in this invention is 10 to 30%, preferably 12 to 27%, and more preferably 13 to 25%.

[0029] Na2O can improve the meltability of glass and lower its liquidus temperature. However, if its content is too high, it promotes a decrease in the glass's resistance to crystallization and lengthens the time it takes for the glass to change from liquid to solid during cooling and molding, making crystallization more likely. Therefore, the Na2O content in this invention is 0-7%, preferably 0-5%, and more preferably 0-3%. In some embodiments, it is even more preferable to not include Na2O.

[0030] Li2O can effectively lower the transition temperature of glass. However, optical glass is usually smelted using platinum or platinum alloy vessels, and in high-temperature smelting processes, the Li in the glass components easily corrodes the platinum or platinum alloy vessels, resulting in a large amount of platinum-containing impurities in the finished glass product, which in turn reduces the ultraviolet transmittance of the glass. Therefore, the Li2O content in this invention is 0-5%, preferably 0-4%, and more preferably 0-3%. In some embodiments, it is even more preferable to not include Li2O.

[0031] In some embodiments, controlling the ratio of the total content of Li2O, Na2O, and K2O (Li2O+Na2O+K2O) to the content of B2O3 ((Li2O+Na2O+K2O) / B2O3) to within the range of 0.7 to 6.0 can improve the ultraviolet transmittance and refractive index batch stability of the glass, which is very important for photolithography equipment. Therefore, preferably, (Li2O+Na2O+K2O) / B2O3 is 0.7 to 6.0, more preferably, (Li2O+Na2O+K2O) / B2O3 is 0.8 to 5.0, even more preferably, (Li2O+Na2O+K2O) / B2O3 is 1.0 to 3.0, and even more preferably, (Li2O+Na2O+K2O) / B2O3 is 1.5 to 2.0.

[0032] In some embodiments, controlling the ratio of the total content of Li2O, Na2O, and K2O (Li2O+Na2O+K2O) to the content of SiO2 ((Li2O+Na2O+K2O) / SiO2) within the range of 0.15 to 0.8 can suppress the volatilization of F in the glass, improve the batch stability of the refractive index of the glass, and lower the transition temperature of the glass. Therefore, preferably, (Li2O+Na2O+K2O) / SiO2 is 0.15 to 0.8, and more preferably, (Li2O+Na2O+K2O) / SiO2 is 0.18 to 0.7. Furthermore, controlling (Li2O+Na2O+K2O) / SiO2 within the range of 0.2 to 0.6 can optimize the abrasion degree, high-temperature viscosity, and weather resistance of the glass to a more appropriate range. Therefore, more preferably, (Li2O+Na2O+K2O) / SiO2 is 0.2 to 0.6, and even more preferably, (Li2O+Na2O+K2O) / SiO2 is 0.2 to 0.45.

[0033] Ln2O3 (where Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, and Yb2O3) is a component that can improve the refractive index and chemical stability of glass. By limiting the Ln2O3 content to 5% or less, it is possible to prevent a decrease in the devitrification resistance of the glass and prevent the refractive index and Abbe number of the glass from exceeding the design requirements. Therefore, the Ln2O3 content is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is even more preferable to omit La2O3 and / or Gd2O3 and / or Y2O3 and / or Yb2O3.

[0034] Nb2O5, TiO2, Bi2O3, Ta2O5, and WO3 are oxides with high refractive index and high dispersion. When used in glass, they improve the UV resistance of the glass, as well as its refractive index and dispersion. However, if the content of the above oxides is high, the UV transmittance of the glass decreases. Therefore, the content of Nb2O5 in this invention is 0-2%, preferably 0-1%, and more preferably 0-0.8%. The content of TiO2 is 0-2%, preferably 0-1%, and more preferably 0-0.8%. The content of Bi2O3 is 0-2%, preferably 0-1%, and more preferably 0-0.5%. The content of WO3 is 0-2%, preferably 0-1%, and more preferably 0-0.5%. The content of Ta2O5 is 0-3%, preferably 0-2%, and more preferably 0-1%.

[0035] In some embodiments, controlling the ratio of the total content of Nb2O5, TiO2, Bi2O3, Ta2O5, and WO3 (Nb2O5+TiO2+Bi2O3+Ta2O5+WO3) to the content of B2O3 ((Nb2O5+TiO2+Bi2O3+Ta2O5+WO3) / B2O3) within a range of greater than 0 to 0.8 improves the UV resistance of the glass, prevents a decrease in the UV transmittance of the glass, and optimizes the bubble degree and refractive index batch stability of the glass. Therefore, preferably, (Nb2O5+TiO2+Bi2O3+Ta2O5+WO3) / B2O3 is greater than 0 and 0.8 or less, more preferably, (Nb2O5+TiO2+Bi2O3+Ta2O5+WO3) / B2O3 is 0.01 to 0.5, even more preferably, (Nb2O5+TiO2+Bi2O3+Ta2O5+WO3) / B2O3 is 0.01 to 0.3, and even more preferably, (Nb2O5+TiO2+Bi2O3+Ta2O5+WO3) / B2O3 is 0.02 to 0.2.

[0036] In some embodiments, controlling the ratio of the total content of Nb2O5 and TiO2 (Nb2O5+TiO2) to the content of Al2O3 ((Nb2O5+TiO2) / Al2O3) to 2.0 or less improves the UV resistance of the glass and simultaneously prevents an increase in the density of the glass. Therefore, preferably, (Nb2O5+TiO2) / Al2O3 is 2.0 or less, and more preferably, (Nb2O5+TiO2) / Al2O3 is 0.01 to 1.5. Furthermore, controlling (Nb2O5+TiO2) / Al2O3 to the range of 0.05 to 1.0 further optimizes the degree of glass wear and striations. Therefore, more preferably, (Nb2O5+TiO2) / Al2O3 is 0.05 to 1.0, and even more preferably, (Nb2O5+TiO2) / Al2O3 is 0.1 to 0.5.

[0037] Alkaline earth metal oxides (RO, where RO is one or more of BaO, SrO, CaO, and MgO) adjust the optical constants and high-temperature viscosity of glass, but if their content is high, it reduces the ultraviolet transmittance and chemical properties of the glass. Therefore, the RO content is 0-8%, preferably 0-5%, and more preferably 0-2%. In some embodiments, it is even more preferable to omit BaO and / or SrO and / or CaO and / or MgO.

[0038] ZnO can strengthen the network structure of glass and improve its refractive index and ultraviolet transmittance. Too much ZnO can cause the glass to split easily, reducing ultraviolet transmittance and worsening its striations. Therefore, the ZnO content is 0-5%, preferably 0-2%, and more preferably less than 1%. In some embodiments, it is even more preferable to have no ZnO at all.

[0039] P2O5 lowers the melting temperature of the glass raw material and increases the ultraviolet transmittance of the glass. However, if its content is high, the crystallization prevention performance and chemical stability of the glass decrease. Therefore, the P2O5 content is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is even more preferable to not include P2O5.

[0040] In this invention, by including 0-1% of one or more of Sb2O3, SnO2, and CeO2 as a clarifying agent, the clarifying effect of the glass can be enhanced and the degree of bubble formation in the glass can be increased. Preferably, the clarifying agent content is 0-0.5%, and more preferably, 0-0.2%. The optical glass of this invention has a rationally designed composition and content, and exhibits excellent bubble formation; therefore, in some embodiments, it is even more preferable to not include a clarifying agent. When the Sb2O3 content exceeds 1%, the glass tends to lose its clarifying performance, and at the same time, its strong oxidizing effect promotes corrosion of platinum or platinum alloy containers used for glass melting and deterioration of molding dies. Therefore, in this invention, preferably, the Sb2O3 content is 0-1%, more preferably 0-0.5%, even more preferably 0-0.2%, and even more preferably, Sb2O3 is not included. SnO2 can also be used as a clarifying agent, but if its content exceeds 1%, the glass tends to become discolored, or when the glass is heated and softened and then reshaped by press molding, Sn acts as a nucleation site for crystal formation, making it prone to devitrification. Therefore, the SnO2 content in the present invention is 0-1%, more preferably 0-0.5%, even more preferably 0-0.2%, and even more preferably no SnO2. The ratio of the action and content of CeO2 is the same as that of SnO2, and its content is preferably 0-1%, more preferably 0-0.5%, even more preferably 0-0.2%, and even more preferably no CeO2.

[0041] Fluorine (F) can lower the transition temperature of glass and improve its UV transmittance and UV resistance. If the F content is too high, volatilization during the glass melting process increases, causing fluctuations in the refractive index and the inherent quality of the glass (stratigraphy, bubble degree). At the same time, the optical uniformity of the glass does not meet the design requirements, and it negatively affects the production environment and the health of workers. Therefore, the F content should be between 3% and 20%, preferably between 5% and 16%, and more preferably between 6% and 12%.

[0042] In some embodiments, controlling the ratio of F content to B2O3 content, F / B2O3, to a range of 0.2 to 5.0 can improve the ultraviolet transmittance of the glass and prevent deterioration of its UV resistance. Therefore, preferably, F / B2O3 is 0.2 to 5.0, and more preferably, F / B2O3 is 0.3 to 2.0. Furthermore, controlling F / B2O3 to a range of 0.4 to 1.5 can further optimize the degree of bubble formation and abrasion of the glass. Therefore, more preferably, F / B2O3 is 0.4 to 1.5, and even more preferably, F / B2O3 is 0.5 to 0.9.

[0043] In some embodiments, controlling the ratio of Al2O3 content to F content, Al2O3 / F, to 0.1 or less can prevent a decrease in the UV transmittance and weather resistance of the glass. Therefore, preferably, Al2O3 / F is 1.0 or less, and more preferably, Al2O3 / F is 0.8 or less. Furthermore, controlling Al2O3 / F in the range of 0.01 to 0.5 can further enhance the striation of the glass. Therefore, more preferably, Al2O3 / F is 0.01 to 0.5, and even more preferably, Al2O3 / F is 0.07 to 0.3.

[0044] In some embodiments, controlling the ratio of K2O content to F content, K2O / F, within the range of 0.7 to 7.0 helps improve the striation and UV resistance of the glass, and improve the refractive index batch stability of the glass. Therefore, preferably, K2O / F is 0.7 to 7.0, more preferably, K2O / F is 1.0 to 5.0, even more preferably, K2O / F is 1.5 to 3.0, and even more preferably, K2O / F is 1.8 to 2.8.

[0045] In some embodiments, controlling the ratio of SiO2 content to the total content of K2O and F, K2O+F, SiO2 / (K2O+F), within the range of 1.2 to 4.5 helps the glass obtain appropriate abrasion and transition temperature. Therefore, preferably, SiO2 / (K2O+F) is 1.2 to 4.5, and more preferably, SiO2 / (K2O+F) is 1.3 to 3.5. Furthermore, controlling SiO2 / (K2O+F) within the range of 1.5 to 3.0 can further increase the bubbleness and ultraviolet transmittance of the glass. Therefore, even more preferably, SiO2 / (K2O+F) is 1.5 to 3.0, and even more preferably, SiO2 / (K2O+F) is 1.7 to 2.5.

[0046] In some embodiments, the ratio of the total content of ZrO2, Nb2O5, and TiO2 (ZrO2+Nb2O5+TiO2) to the content of F (F) (ZrO2+Nb2O5+TiO2) / F is controlled to be within the range of 0.01 to 1.0, so that the glass has excellent UV resistance and a low transition temperature, as well as appropriate abrasion resistance. Therefore, preferably, (ZrO2+Nb2O5+TiO2) / F is 0.01 to 1.0, more preferably, (ZrO2+Nb2O5+TiO2) / F is 0.01 to 0.8, even more preferably, (ZrO2+Nb2O5+TiO2) / F is 0.02 to 0.6, and even more preferably, (ZrO2+Nb2O5+TiO2) / F is 0.03 to 0.4.

[0047] <Ingredients that should not be included> 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 present, either alone or in small amounts, the glass becomes colored and absorption occurs at specific wavelengths in the visible light region. This weakens the visible light transmittance improvement effect of the present invention. Therefore, especially in optical glass where transmittance in the visible light region wavelength is required, these oxides are preferably substantially absent.

[0048] Oxides of Th, Cd, Tl, Os, Be, and Se are increasingly being regulated as hazardous chemicals not only in the glass manufacturing process but also in the processing and post-production treatment, making environmental protection efforts necessary. Therefore, when prioritizing environmental impact, it is preferable to substantially exclude these substances, except for unavoidable contamination. As a result, the optical glass is substantially free of substances that pollute the environment. Accordingly, the optical glass of the present invention can be manufactured, processed, and disposed of without taking special environmental measures.

[0049] From an environmentally friendly standpoint, the optical glass of the present invention preferably does not contain As2O3 and PbO.

[0050] The terms "not included" and "0%" as used herein mean that the compound, molecule, or element is not intentionally added as a raw material for the optical glass of the present invention. However, impurities or components that are not intentionally added may exist as raw materials and / or manufacturing equipment for optical glass, and may be present in small or trace amounts in the final optical glass. This situation is also within the scope of the patent protection of the present invention.

[0051] The performance of the optical glass of the present invention will be described below.

[0052] <Refractive index and Abbe number> Refractive index of optical glass (n d ) and Abbe number (ν d ) shall be tested according to the method specified in "GB / T7962.1-2010".

[0053] 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 the refractive index (n) of the optical glass of the present invention is 1.45, preferably 1.46, and more preferably 1.47. In some embodiments, the refractive index (n) of the optical glass of the present invention is d The upper limit of ) is 1.51, preferably 1.50, and more preferably 1.49.

[0054] In some embodiments, the Abbe number (ν) of the optical glass of the present invention is used. d The lower limit of the Abbe number (ν) of the optical glass of the present invention is 66, preferably 68, and more preferably 69. d The upper limit of ) is 74, preferably 72, and more preferably 71.

[0055] Transmittance τ at <365nm 365nm > The ultraviolet transmittance of the optical glass of the present invention is characterized by the transmittance at 365 nm, and the transmittance at 365 nm (τ 365nm The glass sample was tested according to the method specified in "GB / T7962.12-2010", and the thickness of the glass sample was 10 mm.

[0056] In some embodiments, the transmittance of the optical glass of the present invention at 365 nm (τ 365nm The percentage is 98.0% or higher, preferably 99.0% or higher, and more preferably 99.5% or higher.

[0057] <UV resistance> The UV resistance performance of optical glass is Δτ 365nm or Δτ 405nm Characterized by Δτ 365nm This is the UV attenuation resistance performance of the transmittance at 365 nm, and Δτ 405nm This is the UV attenuation resistance performance of the transmittance at 405 nm, and Δτ 365nm or Δτ 405nm The lower the value, the better the UV resistance of the glass.

[0058] Δτ 365nm The test method is as follows: The original transmittance τ at 365 nm of the sample is measured according to the method specified in "GB / T7962.12-2010". 365nm-1 The glass surface was tested by irradiating it with a high-pressure mercury lamp, and the power density on the glass surface was 1 W / cm². 2 After 2 hours of irradiation, the transmittance τ365nm-2 at 365nm was tested again according to the method specified in "GB / T7962.12-2010", and the difference τ between the two tests was measured. 365nm-1 -τ 365nm-2 This represents the attenuation of glass at that wavelength, and the thickness of the glass sample is 10 mm.

[0059] In some embodiments, the UV attenuation performance (Δτ) of the transmittance of the optical glass of the present invention at 365 nm is determined by the UV attenuation performance (Δτ) 365nm The content of the saturates is 1.0% or less, preferably 0.9% or less, and more preferably 0.8% or less.

[0060] Δτ 405nm The test method is as follows: The original transmittance τ at 405 nm of the sample is determined according to the method specified in "GB / T7962.12-2010". 405nm-1 The glass surface was tested by irradiating it with a high-pressure mercury lamp, and the power density on the glass surface was 1 W / cm². 2 After 2 hours of irradiation, the transmittance at 405 nm τ was measured according to the method specified in "GB / T7962.12-2010". 405nm-2 Test it again and the difference τ between the two tests 405nm-1 -τ 405nm-2 This represents the attenuation of glass at that wavelength, and the thickness of the glass sample is 10 mm.

[0061] In some embodiments, the UV attenuation performance (Δτ) of the transmittance of the optical glass of the present invention at 405 nm is determined by the UV attenuation performance (Δτ) 405nm The amount is 0.5% or less, preferably 0.3% or less, and more preferably 0.2% or less.

[0062] <Bubble level> The bubble degree of optical glass is tested and classified according to the method specified in "GB / T7962.8-2010".

[0063] In some embodiments, the bubble degree of the optical glass of the present invention is A or higher, preferably A0 or higher, and more preferably A 00 It is a certain class.

[0064] <Striae> The test method for striations in optical glass is as follows: A striation measuring device is created using a point light source and a lens, and the striations are compared with a standard sample from the direction in which they are most clearly visible, and classified into four grades according to Table 1.

[0065] [Table 1]

[0066] In some embodiments, the striations of the optical glass of the present invention are of grade C or higher, preferably grade B or higher.

[0067] <Weather resistance> The test method for the weather resistance (CR) of optical glass is as follows: The sample is placed in a test chamber with a relative humidity of 90% and a saturated water vapor environment, and the test is performed for 15 cycles alternating between 40-50°C and 40-50°C every hour. The weather resistance type is classified by the change in turbidity before and after the sample is introduced, and the weather resistance classifications are shown in Table 2.

[0068] [Table 2]

[0069] In some embodiments, the weather resistance (CR) of the optical glass of the present invention is Class 2 or higher, preferably Class 1.

[0070] <Transition Temperature> Transition temperature of optical glass (T g ) shall be tested according to the method specified in "GB / T7962.16-2010".

[0071] In some embodiments, the transition temperature (T) of the optical glass of the present invention is determined to be the same as that of the optical glass of the present invention. g The temperature is 490°C or lower, preferably 480°C or lower, and more preferably 475°C or lower.

[0072] <Abrasion level> Abrasion degree of optical glass (F A This refers to the ratio of the amount of wear of the sample to the amount of wear (volume) of a standard sample (H-K9 glass) under exactly the same conditions, multiplied by 100, and the formula is shown as follows.

[0073] F A =V / V0×100=(W / ρ) / (W0 / ρ0)×100 In the formula, V - volumetric wear of the test sample, V0 - Volume wear amount of standard sample, W - Mass wear amount of the sample under test, W0 - Mass wear amount of standard sample, ρ - density of the test sample, ρ0 - Density of the standard sample.

[0074] In some embodiments, the degree of wear (F) of the optical glass of the present invention is A The lower limit of ) is 60, preferably 65, and more preferably 70.

[0075] In some embodiments, the degree of wear (F) of the optical glass of the present invention is A The upper limit of ) is 90, preferably 85, and more preferably 80.

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

[0077] In some embodiments, the density (ρ) of the optical glass of the present invention is 2.70 g / cm³. 3The following, preferably 2.60 g / cm³ 3 The following, and more preferably, 2.50 g / cm³ 3 The following applies:

[0078] <Refractive Index Batch Stability> The test method for batch stability of optical glass refractive index is as follows: Using the same glass compounding method, manufacturing method, and equipment, the glass is melted in two separate stages. After obtaining the glass after both melting stages, the refractive index n of the first glass is measured according to the method specified in "GB / T7962.1-2010". d1回目 and the refractive index n of the second glass d2回目 Each of them was tested, n d1回目 -n d2回目 This refers to the batch stability of the refractive index of the glass material.

[0079] In some embodiments, the refractive index batch stability of the optical glass of the present invention is -15 × 10 -5 ~+15×10 -5 Preferably, -10 × 10 -5 ~+10×10 -5 And more preferably, -5 × 10 -5 ~+5×10 -5 And more preferably, 2 × 10 -5 ~+2×10 -5 That is the case.

[0080] [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 produced by conventional raw materials and conventional processes, using carbonates, nitrates, sulfates, phosphates, metaphosphates, hydroxides, oxides, fluorides, etc. as raw materials, and after compounding them according to conventional methods, the compounded furnace charge is placed in a smelting furnace (platinum crucible, quartz crucible, etc.) at 1200 to 1450°C and melted, followed by clarification, stirring, and homogenization to obtain homogeneous molten glass free of bubbles and unmelted material, which is then poured into a mold and annealed. Those skilled in the art can appropriately select the raw materials, processing methods, and processing parameters according to actual needs.

[0081] [Glass preforms and optical components] For example, glass preforms can be manufactured from optical glass using die molding methods such as direct drop molding, grinding, or heated press molding. That is, glass preforms can be manufactured by directly precision drop molding molten optical glass into a glass precision preform, or by machining such as polishing or grinding, or by manufacturing a preform material for die molding from optical glass, reheating and press molding the preform material, and then grinding it to produce a glass preform. It should be noted that the means for manufacturing glass preforms are not limited to the above means.

[0082] As described above, the optical glass of the present invention is useful for various optical components and optical designs. In particular, a preform material is formed from the optical glass of the present invention, and components such as lenses and prisms are manufactured by reheating press molding, precision stamping molding, etc., using the preform material.

[0083] Both the glass preform and optical components of the present invention are formed from the optical glass of the present invention. The glass preform of the present invention has the excellent properties of optical glass, and the optical components of the present invention have the excellent properties of optical glass, making it possible to provide various optical components such as lenses and prisms with high optical value.

[0084] 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.

[0085] [Optical equipment] Optical components formed from the optical glass of the present invention can be used in the manufacture of optical equipment such as photographic equipment, video recording equipment, projection equipment, display equipment, mask aligners, in-vehicle equipment, and surveillance equipment.

[0086] (Examples) <Examples of optical glass applications> To further clarify and illustrate the technical solutions of the present invention, the following non-limiting examples are provided.

[0087] In this embodiment, optical glass having the compositions shown in Tables 3 to 5 is obtained using the optical glass manufacturing method described above. The properties of each glass were tested according to the test method described in the present invention, and the test results are shown in Tables 3 to 5.

[0088] [Table 3-1]

[0089] [Table 3-2]

[0090] [Table 4-1]

[0091] [Table 4-2]

[0092] [Table 5-1]

[0093] [Table 5-2]

[0094] <Examples of glass preforms> Using 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 by die forming means such as grinding, reheating press forming, or precision stamping.

[0095] <Examples of optical components> The preforms obtained in the above-described examples of glass preforms are annealed, and the internal stress of the glass is reduced while fine-tuning the refractive index so that the refractive index and other optical properties reach the required values.

[0096] Next, each preform is ground to produce various lenses and prisms, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. An anti-reflective coating can also be applied to the surface of the resulting optical components.

[0097] <Examples of optical instruments> Optical components manufactured by the embodiments of the optical components described above can be used, for example, in imaging equipment, sensors, microscopes, medical technology, digital projection, communications, optical communications technology / information transmission, automotive optics / lighting, photolithography technology, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips, through optical design and by using one or more optical components to form optical members or optical assemblies.

Claims

1. It is an optical glass, and its components are, by weight percentage, 50-70% SiO ２ , 2-18% B ２ O ３ , 10-30% K ２ O, 0-2% Nb ２ O ５ , 0-2% TiO ２ , 0-3% ZrO ２ , and, 4.53% to 20% or less of F, SiO ２ / (K ２ O + F) is 1.2 to 4.5, and (ZrO ２ +Nb ２ O ５ +TiO ２ Optical glass characterized in that the ratio of ) / F is between 0.01 and 1.

0.

2. Its components are 0-5% Al by weight. ２ O ３ , and / or 0-7% Na ２ O, and / or 0-5% Li ２ O, and / or 0-5% Ln ２ O ３ , and / or 0-2% WO ３ , and / or 0-3% Ta ２ O ５ , and / or 0-2% Bi ２ O ３ , and / or 0-8% RO, and / or 0-5% ZnO, and / or 0-3% P ２ O ５ , and / or further comprising 0-1% clarifying agent, the Ln ２ O ３ La ２ O ３ , Gd ２ O ３ , Y ２ O ３ Yb ２ O ３ One or more of the following are present, RO is one or more of BaO, SrO, CaO, MgO, and the clarifying agent is Sb ２ O ３ , SnO ２ , CEO ２ The optical glass according to claim 1, characterized in that it is one or more of the following.

3. It is an optical glass, and its components are, by weight percentage, 50-70% SiO ２ , 2-18% B ２ O ３ , 10-30% K ２ O 0-2% Nb ２ O ５ , 0-2% TiO ２ , 0-3% ZrO ２ , and, 4.53-20% F (ZrO ２ +Nb ２ O ５ +TiO ２ ) / F is between 0.01 and 1.0, Its components are expressed as weight percentages, SiO ２ / (K ２ O + F) is 1.2 to 4.5, and the refractive index n of the optical glass ｄ is 1.45-1.51, Abbe number v ｄ The temperature range is 66-74, and the transition temperature is T. ｇ The temperature should be below 490°C, and the density ρ should be 2.70 g / cm³. ３ Optical glass characterized by the following:

4. Its components are 0-5% Al by weight. ２ O ３ , and / or 0-7% Na ２ O, and / or 0-5% Li ２ O, and / or 0-5% Ln ２ O ３ , and / or 0-2% WO ３ , and / or 0-3% Ta ２ O ５ , and / or 0-2% Bi ２ O ３ , and / or 0-8% RO, 0-5% ZnO, and / or 0-3% P ２ O ５ , and / or comprising 0-1% clarifying agent, the Ln ２ O ３ La ２ O ３ , Gd ２ O ３ , Y ２ O ３ Yb ２ O ３ One or more of the following are present, RO is one or more of BaO, SrO, CaO, MgO, and the clarifying agent is Sb ２ O ３ , SnO ２ , CEO ２ The optical glass according to claim 3, characterized in that it is one or more of the following.

5. The components are expressed as a percentage by weight and satisfy one or more of the following eight conditions: 1) F / B ２ O ３ The range is 0.2 to 5.

0. 2) Al ２ O ３ / F is 1.0 or less, 3) K ２ The O / F ratio is between 0.7 and 7.

0. 4) SiO ２ / (K ２ O+F) is between 1.3 and 3.

5. 5) (Nb ２ O ５ +TiO ２ +Bi ２ O ３ +Ta ２ O ５ +WO ３ ) / B ２ O ３ is greater than 0 to 0.8 or less, 6) (Nb ２ O ５ +TiO ２ ) / Al ２ O ３ It is 2.0 or less, 7) (Li ２ O + Na ２ O+K ２ O) / B ２ O ３ The range is 0.7 to 6.

0. 8) (Li ２ O + Na ２ O+K ２ O) / SiO ２ The optical glass according to any one of claims 1 to 4, characterized in that the coefficient is 0.15 to 0.

8.

6. The components are expressed as weight percentages and satisfy one or more of the following nine conditions: 1) F / B ２ O ３ The range is 0.3 to 2.

0. 2) Al ２ O ３ / F is 0.8 or less, 3) K ２ O / F is between 1.0 and 5.

0. 4) SiO ２ / (K ２ O+F) is between 1.5 and 3.

0. 5) (ZrO ２ +Nb ２ O ５ +TiO ２ ) / F is between 0.01 and 0.8, 6) (Nb ２ O ５ +TiO ２ +Bi ２ O ３ +Ta ２ O ５ +WO ３ ) / B ２ O ３ It is between 0.01 and 0.

5. 7) (Nb ２ O ５ +TiO ２ ) / Al ２ O ３ The range is 0.01 to 1.

5. 8) (Li ２ O + Na ２ O+K ２ O) / B ２ O ３ The range is 0.8 to 5.

0. 9) (Li ２ O + Na ２ O+K ２ O) / SiO ２ The optical glass according to any one of claims 1 to 4, characterized in that the coefficient is 0.18 to 0.

7.

7. The components are expressed as weight percentages and satisfy one or more of the following nine conditions: 1) F / B ２ O ３ It is 0.4 to 1.5, 2) (Nb ２ O ５ +TiO ２ ) / Al ２ O ３ The range is 0.01 to 1.

5. 3) K ２ The O / F ratio is between 1.5 and 3.

0. 4) SiO ２ / (K ２ O+F) is between 1.7 and 2.

5. 5) (ZrO ２ +Nb ２ O ５ +TiO ２ ) / F is between 0.02 and 0.6, 6) (Nb ２ O ５ +TiO ２ +Bi ２ O ３ +Ta ２ O ５ +WO ３ ) / B ２ O ３ The range is 0.01 to 0.

3. 7) (Nb ２ O ５ +TiO ２ ) / Al ２ O ３ The range is 0.05 to 1.

0. 8) (Li ２ O + Na ２ O+K ２ O) / B ２ O ３ The range is 1.0 to 3.

0. 9) (Li ２ O + Na ２ O+K ２ O) / SiO ２ The optical glass according to any one of claims 1 to 4, characterized in that the coefficient is 0.2 to 0.

6.

8. The components are expressed as a percentage by weight and satisfy one or more of the following eight conditions: 1) F / B ２ O ３ It is 0.5 to 0.9, 2) Al ２ O ３ / F is between 0.07 and 0.

3. 3) K ２ The O / F ratio is between 1.8 and 2.

8. 4) (ZrO ２ +Nb ２ O ５ +TiO ２ ) / F is 0.03 to 0.4, 5) (Nb ２ O ５ +TiO ２ +Bi ２ O ３ +Ta ２ O ５ +WO ３ ) / B ２ O ３ It is 0.02 to 0.2, 6) (Nb ２ O ５ +TiO ２ ) / Al ２ O ３ It is between 0.1 and 0.

5. 7) (Li ２ O + Na ２ O+K ２ O) / B ２ O ３ It is between 1.5 and 2.

0. 8) (Li ２ O + Na ２ O+K ２ O) / SiO ２ The optical glass according to any one of claims 1 to 4, characterized in that the coefficient is 0.2 to 0.

45.

9. The components are expressed as weight percentages. SiO ２ is 52-68%, and / or B2O3 is 4-16%, and / or K ２ O is 12-27%, and / or Nb ２ O ５ is 0-1%, and / or TiO ２ is 0-1%, and / or ZrO ２ is 0-2%, and / or F is 5-16%, and / or Al ２ O ３ is 0.1-3%, and / or Na ２ O is 0-5%, and / or Li ２ O is 0-4%, and / or Ln ２ O ３ is 0-3%, and / or WO ３ is 0-1%, and / or Ta ２ O ５ is 0-2%, and / or Bi ２ O ３ is 0-1%, and / or RO is 0-5%, and / or ZnO is 0-2%, and / or P ２ O ５ is 0-2%, and / or The clarifying agent is present in a concentration of 0-0.5%. The Ln ２ O ３ La ２ O ３ , Gd ２ O ３ , Y ２ O ３ Yb ２ O ３ One or more of the following are present, RO is one or more of BaO, SrO, CaO, MgO, and the clarifying agent is Sb ２ O ３ , SnO ２ , CEO ２ An optical glass according to any one of claims 1 to 4, characterized in that it is one or more of the following.

10. The components are expressed as weight percentages. SiO ２ is 54-64%, and / or B ２ O ３ is 8-14%, and / or K ２ O is 13-25%, and / or Nb ２ O ５ is 0-0.8%, and / or TiO ２ is 0-0.8%, and / or ZrO ２ is 0-1%, and / or F is 6-12%, and / or Al ２ O ３ is 0.2 to 2%, and / or Na ２ O is 0-3%, and / or Li ２ O is 0-3%, and / or Ln ２ O ３ is 0-1%, and / or WO ３ is 0-0.5%, and / or Ta ２ O ５ is 0-1%, and / or Bi ２ O ３ is 0-0.5%, and / or RO is 0-2%, and / or ZnO is less than 1%, and / or P ２ O ５ is 0-1%, and / or The clarifying agent is 0-0.2%, and the Ln ２ O ３ La ２ O ３ , Gd ２ O ３ , Y ２ O ３ Yb ２ O ３ One or more of the following are present, RO is one or more of BaO, SrO, CaO, MgO, and the clarifying agent is Sb ２ O ３ , SnO ２ , CEO ２ An optical glass according to any one of claims 1 to 4, characterized in that it is one or more of the following.

11. The component is Na ２ O does not contain and / or Li ２ O-free and / or La2O3-free and / or Gd ２ O ３ Does not include and / or Y ２ O ３ Does not include and / or Yb ２ O ３ It does not contain and / or does not contain ZnO and / or P ２ O ５ An optical glass according to any one of claims 1 to 4, characterized in that it does not contain, and / or BaO, and / or SrO, and / or CaO, and / or MgO.

12. The refractive index n of the optical glass ｄ is 1.45 to 1.51, and / or Abbe number v ｄ is 66-74 and / or Transmittance τ at 365 nm ３６５ｎｍ is 98.0% or more, and / or UV attenuation performance Δτ at 365 nm transmittance ３６５ｎｍ is 1.0% or less, and / or UV attenuation resistance Δτ at the 405 nm point ４０５ｎｍ is 0.5% or less, and / or The degree of the bubble is A-grade or higher, and / or The pulse is of grade C or higher, and / or Weather resistance CR is Class 2 or higher, and / or Transition temperature T ｇ is 490°C or lower, and / or Abrasion level F Ａ is 60 to 90 and / or The density ρ is 2.70 g / cm³. ３ The following and / or The refractive index batch stability is -15 × 10⁻⁶. －５ ~ + 15 × 10 －５ That is An optical glass according to any one of claims 1 to 4, characterized in that

13. The refractive index n of the optical glass ｄ is 1.47 to 1.49, and / or Abbe number v ｄ is 69-71 and / or Transmittance τ at 365 nm ３６５ｎｍ is 99.5% or more, and / or UV attenuation performance Δτ at 365 nm transmittance ３６５ｎｍ is 0.8% or less, and / or UV attenuation resistance Δτ at the 405 nm point ４０５ｎｍ is 0.2% or less, and / or The degree of the bubble is A ００ Grade 1 or higher, and / or The pulse is of grade B or higher, and / or Weather resistance CR is Class 1, and / or Transition temperature T ｇ is 475°C or lower, and / or Abrasion level F Ａ is 70-80 and / or The density ρ is 2.50 g / cm³. ３ The following and / or The refractive index batch stability is -5 × 10⁻⁶. －５ ~ + 5 × 10 －５ The optical glass according to any one of claims 1 to 4, characterized in that it is the optical glass described in any one of claims 1 to 4.

14. A glass preform, characterized in that it is manufactured from the optical glass described in any one of claims 1 to 4.

15. An optical component, characterized in that it is manufactured from the glass preform described in claim 14.

16. An optical instrument, characterized by including the optical component described in claim 15.

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