Optical glass, method for producing the same, and optical element

Abstract

The present invention provides an optical glass, a method for producing the same, and an optical element. The optical glass comprises the following composition in terms of cation mole percentage: B 3+ : 55 to 80%, preferably 63 to 73%; Si 4+ : 0.5 to 5%, preferably 1 to 4.5%; Al 3+ : 0 to 7%, preferably 0.5 to 6%; La 3+ : 5 to 15%, preferably 7 to 13%; Zn 2+ : 0 to 15%, preferably 1 to 10%; Ba 2+ : 0 to 5%, preferably 0.5 to 4%; Sr 2+ : 2 to 11%, preferably 4 to 9%; Zr 4+ : 0.4 to 5%, preferably 1.0 to 3.5%. The optical glass of the present invention has a high refractive index, can obtain a large amount of light refraction, and realizes miniaturization of an optical system; also has a high Abbe number, and can correct chromatic aberration. In addition, the optical glass of the present invention has a low devitrification tendency.

Description

TECHNICAL FIELD

[0001] The present application relates to an optical glass, a preparation method thereof and an optical element, and belongs to the field of optical glasses. BACKGROUND

[0002] With the development of image reproduction devices such as projectors, projection televisions and cameras, the requirements for low-cost, wide-angle, high-definition and ultra-thin optical systems are becoming higher and higher.

[0003] Chinese Patent Application CN112174517A discloses an optical glass with a refractive index of 1.65-1.755 and an Abbe number of 50-57, which contains 4-19% Y2O3 by weight percentage, and ZnO / (Gd2O3+Y2O3) is 0.4-3.0. The composition contains Y2O3 which is relatively expensive, which is not conducive to reducing the cost of glass raw materials.

[0004] Chinese Patent Application CN1903762A discloses an optical glass with a refractive index greater than or equal to 1.65 and an Abbe number of 50-60, which contains 5-20 mol% Li2O. The raw materials such as Li2O and Li2CO3 introduced into Li2O are expensive and have large fluctuations, resulting in high cost and instability, which is not conducive to reducing the cost of glass raw materials.

[0005] US Patent Application US4526874A discloses an optical glass with a refractive index greater than 1.70 and an Abbe number greater than 22, which contains 15-35wt% TiO2, which is not conducive to improving the spectral transmittance of the glass.

[0006] Chinese Patent Application CN101805120A discloses an optical glass with a refractive index of 1.71-1.75 and an Abbe number of 45-52, which contains 15-30wt% of the expensive rare earth element Gd2O3, which is not conducive to reducing the cost of glass raw materials. SUMMARY

[0007] Problems to be solved by the invention

[0008] In view of the technical problems existing in the prior art, the present application first provides an optical glass. The optical glass of the present application has the characteristics of high refractive index, can obtain a large amount of light refraction, and realizes the miniaturization of the optical system; also has the characteristics of high Abbe number, can correct chromatic aberration. In addition, the optical glass of the present application has a low devitrification tendency.

[0009] Further, the present application also provides a preparation method of an optical glass, and the optical glass of the present application can be selectively made by using low-cost raw materials, having the advantage of low cost.

[0010] Solution for solving the problem

[0011] The present application provides an optical glass comprising the following composition in terms of cation mole percentage:

[0012] B 3+ : 55 to 80%, preferably 63 to 73%;

[0013] Si 4+ : 0.5 to 5%, preferably 1 to 4.5%;

[0014] Al 3+ : 0 to 7%, preferably 0.5 to 6%;

[0015] La 3+ : 5 to 15%, preferably 7 to 13%;

[0016] Zn 2+ : 0 to 15%, preferably 1 to 10%;

[0017] Ba 2+ : 0 to 5%, preferably 0.5 to 4%;

[0018] Sr 2+ : 2 to 11%, preferably 4 to 9%;

[0019] Zr 4+ : 0.4 to 5%, preferably 1.0 to 3.5%.

[0020] The optical glass according to the present application, wherein the sum of the contents of Si 4+ , Al 3+ , and B 3+ ∑(Si 4+ + Al 3+ + B 3+ ) is 63 to 83%, preferably 67 to 79% in terms of mole percentage.

[0021] The optical glass according to the present application, wherein the ratio of the sum of the contents of Si 4+ and Al 3+ to the content of B 3+ ∑(Si 4+ + Al 3+ ) / B 3+ is not more than 0.20, preferably not more than 0.18.

[0022] The optical glass according to the present application, wherein the sum of the contents of Ba 2+ and Sr 2+ ∑(Ba 2+ + Sr 2+ ) is 3 to 13%, preferably 6 to 10% in terms of mole percentage.

[0023] The optical glass according to the present application, wherein the content of La 3+ is 0.1 to 0.3, and the content of Ba 2+ and Sr 2+ is 0.1 to 0.3, and the ratio of La 3+ / (Ba 2+ + Sr 2+ ) is 1 to 2, preferably 1.2 to 1.8.

[0024] The content of La 3+ is 0.1 to 0.3, and the content of Si 4+ , B 3+ and Al 3+ is 0.1 to 0.3, and the ratio of La 3+ / (Si 4+ +B 3+ +Al 3+ ) is 0.05 to 0.25, preferably 0.10 to 0.18.

[0025] The optical glass according to the present application, wherein the refractive index of the optical glass is 1.71 to 1.75, and the Abbe number is 50 to 54.

[0026] The optical glass according to the present application, wherein the optical glass does not contain one or more than two kinds of Li + , Na + , K + , Ca 2+ , Ge 4+ , Te 4 + , Gd 3+ , Y 3+ , Ta 5+ , Ti 4+ and W 6+ .

[0027] The optical glass according to the present application, wherein the crystallization temperature of the optical glass is lower than 1000℃, the transition temperature is 655℃ or lower, and the ratio of the transition temperature to the crystallization temperature is 0.6 or higher.

[0028] The internal transmittance of the optical glass of 10mm thickness at 370nm reaches 0.95 or higher.

[0029] The present application also provides a preparation method of the optical glass according to the present application, which comprises weighing and mixing the raw materials of each component according to the proportion, then smelting, and then pouring or pouring into a forming mold, or directly pressing into shape.

[0030] The present application also provides an optical element comprising the optical glass according to the present application.

[0031] Effects of the Invention

[0032] The optical glass of the present application has a high refractive index, and can obtain a large amount of refraction of light, and can realize miniaturization of an optical system. Further, the optical glass of the present application has a high Abbe number, and can correct chromatic aberration. In addition, the optical glass of the present application has a low tendency of devitrification.

[0033] The raw material cost and the manufacturing cost of the method for producing the optical glass of the present application are low, and mass production is possible. DETAILED DESCRIPTION

[0034] Various exemplary embodiments, features, and aspects of the present application will be described in detail below. The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.

[0035] In addition, in order to better illustrate the present application, numerous specific details are set forth in the following detailed description. One skilled in the art will understand, however, that the application can be practiced without certain of the specific details herein. In other instances, well-known methods, structures, apparatuses, and steps have not been described in detail in order to avoid obscuring the subject matter of the present application.

[0036] Unless otherwise defined, all terms used in the present specification, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that the terms of the present application, unless otherwise specifically defined, are used in their broadest sense as an abbreviation of a concept.

[0037] In the present specification, the meaning indicated by "may" includes both the meaning of performing a certain process and the meaning of not performing the certain process.

[0038] In the present specification, the expressions "some specific / preferred embodiments", "other specific / preferred embodiments", "embodiments", and the like, mean that the specific elements (for example, features, structures, properties, and / or characteristics) described in relation to the embodiments are included in at least one of the embodiments described herein, and can be present in other embodiments or can not be present in other embodiments. In addition, it should be understood that the elements can be combined in various embodiments in any suitable manner.

[0039] In the present specification, the numerical range indicated by "numerical value A to numerical value B" means a range including the end point values A and B.

[0040] The present application provides an optical glass comprising the following composition in terms of cation mole percentage:

[0041] B 3+ : 55 to 80%, preferably 63 to 73%;

[0042] Si 4+ : 0.5-5%, preferably 1-4.5%;

[0043] Al 3+ : 0-7%, preferably 0.5-6%;

[0044] La 3+ : 5-15%, preferably 7-13%;

[0045] Zn 2+ : 0-15%, preferably 1-10%;

[0046] Ba 2+ : 0-5%, preferably 0.5-4%;

[0047] Sr 2+ : 2-11%, preferably 4-9%;

[0048] Zr 4+ : 0.4-5%, preferably 1.0-3.5%.

[0049] The optical glass of the present application has a refractive index (n d ) of 1.71-1.75 and an Abbe number (υ d ) of 50-54. The optical glass of the present application can be made using low-cost raw materials, has the advantage of low cost, has a high refractive index, can obtain a large amount of light refraction, and can realize miniaturization of an optical system, and has a high Abbe number, and can correct chromatic aberration.

[0050] In the present application, the anions of the optical glass are all O 2- .

[0051] The "molar percentage of cation" of the present application refers to the percentage of the number of moles of the cation to the total number of moles of all cations.

[0052] In the optical glass of the present application, the above-mentioned cations are selected in terms of molar percentage for the following reasons.

[0053] B 3+ is a component that constitutes the glass framework and is also a fluxing agent that reduces the viscosity of the glass during melting. Boron oxygen triangles [BO3] and boron oxygen tetrahedra [BO4] are structural units, and boron can exist in the form of a triangle [BO3] or a boron oxygen tetrahedron [BO4] under different conditions. Under high-temperature melting conditions, it is generally difficult to form a boron oxygen tetrahedron, and it can only exist in the form of a triangle, but under low-temperature conditions, B 3+It has the tendency to form tetrahedron with free oxygen, which makes the structure compact and increases the low temperature viscosity of the glass. However, it also has the characteristics of reducing the viscosity of the glass at high temperature and increasing the viscosity of the glass at low temperature, and is the main component for reducing the refractive index of the glass. When the content of B 3+ is too low, it cannot play the role of fluxing, and at the same time, it reduces the chemical stability of the glass; when the content of B 3+ is too high, it reduces the refractive index of the glass, and at the same time, it increases the phase separation tendency of the glass. Therefore, the content of B 3+ is 55-80%, preferably 63-73%, and more preferably 66-70% in terms of mole percentage.

[0054] Si 4+ is also a network former of the glass, which can promote the formation of stable glass, and is an effective component for increasing the viscosity and anti-crystallization performance and chemical stability of the glass. If the content of Si 4+ is too low, it cannot play the expected role; if the content of Si 4+ is too high, it causes the melting property of the glass to be poor and the upper limit temperature of crystallization to be high. Therefore, the content of Si 4+ is controlled to be 0.5-5% in terms of mole percentage, preferably 1-4.5%, and more preferably 2-4%.

[0055] Al 3+ can increase the chemical durability of the glass and the acid resistance, and in a specific composition, it can increase the resistance to devitrification of the glass. In the glass structure, Al 3+ exists in the form of tetrahedron [AlO4] or octahedron [AlO6], and can form a uniform and continuous three-dimensional spatial network with silicon oxygen tetrahedron [SiO4], boron oxygen triangle [BO3] or boron oxygen tetrahedron [BO4]. If the content of Al 3+ is too high, the network chain length in the glass increases, which causes the viscosity of the glass to be large, the bubbles in the glass to be difficult to overflow, the melting temperature of the glass to be high, and the temperature at which the glass is prone to crystallization to be high. Therefore, the content of Al 3+ is controlled to be 0-7% in terms of mole percentage, preferably 0.5-6%, and more preferably 1-5%.

[0056] Through research and experiments, it is found that in the present application, the sum of the contents of Si 4+ , Al 3+ and B 3+ ∑(Si 4+ + Al 3+ + B 3+ ) has an important influence on the performance of the glass. The structure of the borate glass determines that it has poor chemical stability, small high temperature viscosity and is prone to devitrification. In order to improve the properties of the borate glass, part of Si 4+ , Al 3+ is usually replaced by B3+ improving the chemical stability of the glass, reducing the devitrification tendency, and increasing the forming range of the glass; the electrical valence of the rare earth ions is high, the field strength is great, and the ability to give free oxygen is weak, so if the content of B 3+ in the composition is too high, there will be more boron oxygen triangles [BO3] in the glass, if the content of B 3+ is appropriate, and Si 4+ , Al 3+ is introduced into the glass, when there is sufficient free oxygen in the glass, the boron oxygen triangle [BO3] is converted to the boron oxygen tetrahedron [BO4], and the [BO4] is separated by the silicon oxygen tetrahedron [SiO4], the three structure groups form a balance, the structure network is strengthened, and the generation of boron crystalline compounds is inhibited. Therefore, in the present application, the content of ∑(Si 4+ + Al 3+ + B 3+ ) is controlled at 63-83%, preferably controlled at 67-79%, more preferably controlled at 70-76%.

[0057] Similarly, in the present application, the ratio of the sum of the contents of Si 4+ and Al 3+ to the content of B 3+ ∑(Si 4+ + Al 3+ ) / B 3+ has a crucial influence on the performance of the glass, if the content of ∑(Si 4+ + Al 3+ ) / B 3+ is too high, the melting amount of La 3+ in the glass will be reduced, at the same time, the formation of internal crystal nucleus in the glass will be increased, the internal foreign matters will be increased and grown, which leads to the fact that the glass cannot be made into lens blanks by the secondary compression molding method, and leads to the increase of the cost of the lens. Therefore, in the present application, the content of ∑(Si 4+ + Al 3+ ) / B 3+ is not more than 0.20, preferably not more than 0.18, in terms of mole percentage.

[0058] La 3+ is an effective component for increasing the refractive index of the glass and increasing the Abbe number, and is the main component of optical glass. When the content of La 3+ in the glass is too low, the glass cannot reach the required high refractive index, and when the content of La 3+ is too high, the glass has poor crystallization performance and very low high-temperature viscosity, which is not conducive to the forming of the glass. Therefore, in the present application, the content of La 3+ is 5-15%, preferably 7-13%, more preferably 8-12%, and particularly preferably 9.5-11.5%, in terms of mole percentage.

[0059] Zn 2+ is an effective component for improving chemical stability and thermal stability of the glass and the refractive index. The zinc-oxygen octahedron [ZnO6] is used as the network modifier oxide, and the zinc-oxygen tetrahedron [ZnO4] is also formed to enter the structure network of the glass, so that the structure of the glass is more stable. If the content of Zn 2+ is too high, the corresponding effect cannot be achieved. Therefore, in the present application, the content of Zn 2+ is controlled to be 0-15%, preferably 1-10%, and more preferably 1.5-8.0% in terms of mole percentage.

[0060] Ba 2+ is an arbitrary component which can not only improve the refractive index and devitrification resistance of the glass, but also improve the melting property of the glass raw material, but the content of Ba 2+ is too high, which increases the specific gravity of the glass and has strong corrosion to the melting device, and is not conducive to reducing the production cost of the glass. In the present application, the content of Ba 2+ is controlled to be 0-5%, and preferably 0.5-4%.

[0061] Sr 2+ has the effect of improving the low-temperature melting property of the glass and the refractive index of the glass, and can improve the internal transmittance of the glass. When the content of Sr 2+ is too low, the internal transmittance of the obtained glass cannot achieve the effect of the present application, but when the content of Sr 2+ is too high, it is difficult to obtain the optical performance of the present application. Therefore, in the present application, the content of Sr 2+ is 2-11% in terms of mole percentage, preferably 4-9%, and particularly preferably 5-8%.

[0062] It is found through a large number of experiments that Ba 2+ and Sr 2+ are network modifier ions in the glass structure, and the polyhedron around the ions will tend to regular arrangement due to the strong bond, which increases the short-range order of the glass and the glass tends to crystallize. Therefore, in the present application, the sum of the contents of Ba 2+ and Sr 2+ ∑(Ba 2+ + Sr 2+ ) is 3-13% in terms of mole percentage, preferably 6-10%, and more preferably 7-9%.

[0063] It is found through a large number of experiments that the ratio of the content of La 3+ to the sum of the contents of Ba 2+ and Sr 2+ has a great influence on the optical performance and chemical stability of the present application. In order to achieve the effect of the present application, the content of La 3+ is 0-5% in terms of mole percentage, and the sum of the contents of Ba 2+ and Sr2+ The ratio of the sum of the contents is 1 to 2, preferably 1.2 to 1.8.

[0064] La 3+ The content of Si 4+ B 3+ And Al 3+ The ratio of the sum of contents of La 3+ / (Si 4+ +B 3+ +Al 3+ La plays an important role in the stability and optical properties of glass. 3+ / (Si 4+ +B 3+ +Al 3+ When the value is too low, Sr will decrease. 2+ Ba 2+ With a low melting point, it is difficult to obtain excellent light transmittance; when La 3+ The content of Si 4+ B 3+ And Al 3+ The ratio of the sum of contents of La 3+ / (Si 4+ +B 3+ +Al 3+ When the concentration of La is too high, it leads to a deterioration in the crystallization properties of the glass. To achieve the effects of this invention, the La content, expressed as a molar percentage, is... 3+ / (Si 4+ +B 3+ +Al 3+ The value can be 0.05 to 0.25, preferably 0.10 to 0.18, and particularly preferably 0.13 to 0.17.

[0065] Zr 4+ It possesses high refractive index and low dispersion properties. Introducing it into glass can improve its chemical stability and increase its refractive index; when glass contains a large amount of rare earth ions, introducing a certain amount of Zr can further enhance its properties. 4+ It can reduce the tendency of glass to crystallize; but when Zr 4+ Excessive Zr content can raise the upper limit of glass crystallization temperature, increase the crystallization rate, and worsen the glass's resistance to crystallization. Furthermore, Zr has a small ionic radius, high charge, and a strong ionic field; when Zr... 4+ When the Zr content is too high, it can cause anion accumulation, which tends to cause phase separation in the glass; and when Zr... 4+ When the content of Zr is too low, it will not have the desired effect. Therefore, in this invention, the content of Zr is specified as a molar percentage. 2+ The content is 0.4-5%, preferably 1.0-3.5%, and more preferably 1.8-3.0%.

[0066] Sb 3+It can be introduced in the glass system to eliminate bubbles, and its content is not higher than 0.05%.

[0067] In the present application, the optical glass can not contain one or a combination of two or more of Li + , Na + , K + , Ca 2+ , Ge 4+ , Te 4+ , Gd 3+ , Y 3+ , Ta 5+ , Ti 4+ and W 6+ .

[0068] Ca 2+ can also increase the refractive index of the glass, accelerate the melting and fining process of the glass, and improve the chemical stability of the glass; but at high temperature, it can reduce the viscosity of the glass liquid, accelerate the corrosion of the high-temperature glass liquid to the melting equipment, increase the impurity content in the glass, and strengthen the crystallization tendency of the glass. In the present application, the glass former is B 3+ , which has low high-temperature viscosity, so Ca 2+ is not introduced.

[0069] The optical glass of the present application can not contain Li + , Na + and K + which affect the thermal properties of the glass, can not contain Ti 4+ and W 6+ which affect the internal transmission of the glass, and can not contain Ge 4+ , Te 4+ , Gd 3+ , Y 3+ and Ta 5+ which are expensive.

[0070] In addition, in order to ensure the spectral transmittance of the optical glass of the present application, the optical glass provided by the present application does not artificially introduce other elements that can be colored, such as V, Mo, Cr, Mn, Fe, Co, Ni, Cu and Ag; and does not artificially introduce compounds containing harmful elements such as Th, Cd, Tl, Os, Be, Se, Pb, As, Hg and fluorides.

[0071] Further, in the present application, the crystallization temperature of the optical glass is lower than 1000℃, the transition temperature is lower than 655℃, and the ratio of the transition temperature to the crystallization temperature is higher than 0.6; the density of the optical glass of the present application is lower than 4.20g / cm 3 .

[0072] The internal transmittance of the optical glass of 10 mm thickness at 370 nm is 0.95 or more.

[0073] In the present application, the optical glass has excellent chemical stability. Specifically, the optical glass of the present application has a water resistance stability (powder method) of Grade 1; an acid resistance stability (powder method) of Grade 3 or more, for example, Grade 3, Grade 2, Grade 1, etc.; a surface method moisture resistance stability (surface method) of Grade 1; a surface method acid resistance stability (surface method) of Grade 2 or more, for example, Grade 2, Grade 1, etc.; an alkali resistance stability (surface method) of Grade 1; and a washing resistance stability (surface method) of Grade 2 or more, for example, Grade 2, Grade 1, etc.

[0074] The present application also provides a preparation method of the optical glass according to the present application, characterized in that the method comprises the following steps: weighing and mixing the raw materials of each component according to the proportion, melting, and then pouring or pouring into a forming mold, or directly pressing into a shape.

[0075] Specifically, the preparation method comprises the following steps: weighing and mixing the raw materials of each component according to the proportion to prepare a batch, and putting the prepared batch into a melting device (such as a platinum crucible, etc.), melting into a glass liquid at a temperature of 1150-1200°C, rising to 1250-1300°C to homogenize and remove bubbles, and reducing to 1000-1050°C to adjust the viscosity of the glass liquid. The whole process takes about 4-6 hours, and finally pouring or pouring into a forming mold, or directly pressing into a shape, and slowly cooling to obtain the optical glass.

[0076] The present application also provides an optical element comprising the optical glass according to the present application. The optical element is mainly used in digital products, video cameras, liquid crystal projection, etc.

[0077] Examples

[0078] The embodiments of the present application will be described in detail below with reference to the examples, but those skilled in the art will understand that the following examples are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application. The specific conditions are not specified in the examples, and the conventional conditions or the conditions recommended by the manufacturer are used. The reagents or instruments used are not specified by the manufacturer, and are all conventional products that can be obtained by purchase.

[0079] Examples 1-98

[0080] Example 1-98 Each component is made of SiO2, H3BO3, La2O3, ZnO, SrCO3, BaCO3, ZrO2, Al(OH)3, etc. The raw materials are weighed according to the proportions in Tables 1-14, mixed uniformly, and then made into a batch. The batch is then put into a platinum crucible, melted into a glass liquid at a temperature of 1150-1200°C, homogenized and bubble-removed at a temperature of 1250-1300°C, and the viscosity of the glass liquid is adjusted at a temperature of 1020°C. After about 5 hours, the glass is poured into a mold and slowly cooled to obtain an optical glass.

[0081] Performance test

[0082] 1. Refractive index n d , Abbe number υ d

[0083] The refractive index n d , Abbe number υ d of the obtained optical glass are measured according to the test method of GB / T 7962.1-2010, and the n d , υ d listed in the table are the data after annealing at -4°C / H.

[0084] 2. Transition temperature (Tg) of the optical glass

[0085] The transition temperature (Tg) of the optical glass is tested by using a TMA tester of the American PE company.

[0086] 3. Crystallization temperature L T of the optical glass

[0087] The crystallization temperature L T of the optical glass is measured by using a GM-N16P gradient furnace of the Japanese Hozan company.

[0088] 4. Density (ρ) of the optical glass

[0089] The measurement is performed according to the method specified in GB / T 7962.20-87.

[0090] 5. λd 80 and λ5

[0091] A glass sample with a thickness of 10±0.1mm and mutually parallel planes polished by optical grinding is prepared. A light with an intensity of I in is shot into the glass sample from a direction perpendicular to the above-mentioned planes, the intensity of the transmitted light I out is measured, and the intensity ratio I out / I in is called the external transmittance of the glass.

[0092] The wavelength corresponding to 80% external transmittance in the range of 200 to 700 nm is denoted by λ 80 The wavelength corresponding to 5% external transmittance is denoted by λ5.

[0093] 6. Water resistance stability D by powder method W

[0094] A 10 g ± 0.0001 g of powder glass having a particle size of 425 to 560 μm is charged into a filter, immersed in a quartz glass flask containing 80 mL of distilled water (pH = 6.5 to 7.5), and kept at a constant temperature of 98 to 100°C in a water bath for 60 minutes. The glass particles are all transferred to a constant weight filter, washed with 80 mL of anhydrous ethanol, and dried at 120 ± 5°C to a constant weight. The glass leaching percentage is calculated according to the formula: D = (B - C) / A x 100 W where D is the glass leaching percentage (%); B is the mass of the filter and sample (in g); C is the mass of the filter and sample after erosion (in g); and A is the mass of the filter (in g).

[0095] The water resistance stability D of optical glass is classified according to the mass leaching percentage, as shown in Table a below. W Table a

[0096] Table a

[0097]

[0098] 7. Acid resistance stability D by powder method A

[0099] The determination method is similar to that of D W , except that the flask is charged with 0.01 mol / L nitric acid solution for treatment. The glass leaching percentage is calculated according to the formula: D = (B - C) / A x 100 A where D is the glass leaching percentage (%); B is the mass of the filter and sample (in g); C is the mass of the filter and sample after erosion (in g); and A is the mass of the filter (in g).

[0100] The acid resistance stability D of optical glass is classified according to the mass leaching percentage, as shown in Table b below. A Table b

[0101] Table b

[0102]

[0103] 8. Surface method for moisture resistance stability R C (S)

[0104] The optical glass resistance to moist atmosphere is classified into three levels according to the time required for hydrolytic spots to form on the polished surface of the glass at a temperature of 50°C and a relative humidity of 85%, as shown in Table C.

[0105] Table C

[0106]

[0107] 9. Surface method resistance to acid R A (S)

[0108] The optical glass resistance to acid is classified into three levels according to the time required for interference colors to appear on the polished surface of the glass, or for the surface to become mottled or to flake off, in an acetic acid solution of 0.1 N (pH = 2.9) at a temperature of 50°C, as shown in Table D.

[0109] Table D

[0110]

[0111] 10. Surface method resistance to alkali R OH (S)

[0112] A six-surface polished sample of size 40 mm x 40 mm x 5 mm is immersed in a fully stirred aqueous solution of sodium hydroxide having a constant temperature of 50°C ± 3°C and a concentration of 0.01 mol / l for 15 hours. The optical glass resistance to alkali R 2 (S) is classified into five levels according to the average value of the amount of leaching per unit area, in mg / (cm OH ·15h), as shown in Table E.

[0113] Table E

[0114]

[0115] 11. Surface method resistance to washing RP(S)

[0116] A six-surface polished sample of size 35 mm x 35 mm x 8 mm is immersed in a fully stirred aqueous solution of Na5P3O 10 10 having a constant temperature of 50°C ± 3°C and a concentration of 0.01 mol / l for 1 hour. The optical glass resistance to washing RP(S) is classified into five levels according to the average value of the amount of leaching per unit area, in mg / (cm 2 ·h), as shown in Table F.

[0117] Table F

[0118]

[0119] 12. Internal transmittance τ at 370 nm 10 :

[0120] The internal transmittance is the transmittance excluding surface reflection loss of the sample. It was measured using a Hitachi UH4150UV-VIS-NIR spectrophotometer with 10mm and 50mm thickness samples exhibiting grade 1 bubbles and grade B streaks. The transmittance was then calculated using the following formula:

[0121]

[0122] In the formula: τ 10 —Internal transmittance of a 10mm sample; T 10 T 50 —Transmittance (including surface loss) of samples with a thickness of 10 mm and 50 mm; Refractive index n of the optical glass prepared in Examples 1-98 d Abbe number υ d Transition temperature Tg, liquidus temperature L T When the specific gravity ρ and external transmittance reach 80%, the corresponding wavelength λ 80 When the external transmittance reaches 5%, the corresponding wavelength λ5 is observed; water resistance stability D. W (Powder method), acid resistance stability D A (Powder method), stability against humid atmosphere R C (S) (Surface method), acid resistance stability R A (S)(Surface method), Alkali resistance stability R OH (S) (surface method), washability stability RP(S) (surface method), etc., are listed in Table 1-14.

[0123] Table 1: Examples 1-7

[0124] Composition / mol% 1 2 3 4 5 6 7 Si 4+ ]] 4.5 2.2 4.2 4.5 4.1 4.5 0.9 Al 3+ ]] 1.1 1.9 0 1.5 5.5 1 3.3 B 3+ ]]> 65.2 70.4 69.9 73.5 62.2 64.2 68.1 La 3+ ]] 11.3 11.6 12.9 9.9 11.2 10.9 9.1 Zn 2+ ]] 9.7 4.2 1.9 1.6 6.6 10.6 9.5 Sr 2+ ]]> 6.2 5.7 6.2 6.9 7.4 8.4 4.9 Ba 2+ ]] 0 1.9 2.7 1.6 0 0 3 Zr 4+ ]] 2 2.1 2.2 0.5 3 0.4 1.2 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 70.8 74.5 74.1 79.5 71.8 69.7 72.3 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.09 0.06 0.06 0.08 0.15 0.09 0.06 ∑(Sr 2+ +Ba 2+ )]]> 6.2 7.6 8.9 8.5 7.4 8.4 7.9 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.8 1.5 1.4 1.2 1.5 1.3 1.2 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.16 0.16 0.17 0.12 0.16 0.16 0.13 n d ]]> 1.7259 1.7143 1.7221 1.7126 1.7247 1.7217 1.7197 d ]]> ​ 51.9 53.2 52.8 53.4 51.6 51.9 51.5 Tg (°C) 638 640 648 650 641 641 642 L T (°C) 960 945 945 945 940 965 960 Tg / L T ]]> 0.66 0.68 0.69 0.69 0.68 0.66 0.67 Specific gravity (g / cm3) 3 )]]> 3.99 4.09 4.11 3.97 4.14 3.94 3.98 80 (nm) ​ 361 361 362 362 361 361 362 ​ 268 270 270 270 268 271 267 10 (370nm) ​ 0.964 0.961 0.962 0.964 0.967 0.973 0.955 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [R C (grade) 1 1 1 1 1 1 1 [R A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) 2 2 2 2 2 2 2

[0125] Table 2: Examples 8-14:

[0126] Composition / mol% 8 9 10 11 12 13 14 Si 4+ ]] 2.9 3.7 4.8 2.6 2 3.6 3.2 Al 3+ ]]> 3.8 2 0 4.2 4.8 1.1 1.9 B 3+ ]]> 74.8 70.6 68.7 64.7 60.3 68.2 67.7 La 3+ ]] 8.3 11.8 11 9.5 12.3 11.4 8.5 Zn 2+ ]]> 0.7 3.2 6.9 9.3 9.8 4.2 8.8 Sr 2+ ]]> 7.1 6.2 7.3 6.9 8.4 8.3 7.5 Ba 2+ ]] 0 0 0 1.7 0 0 0 Zr 4+ ]] 2.4 2.5 1.3 1.1 2.4 3.2 2.4 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 81.5 76.3 73.5 71.5 67.1 72.9 72.8 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.09 0.08 0.07 0.11 0.11 0.07 0.08 ∑(Sr 2+ +Ba 2+ )]]> 7.1 6.2 7.3 8.6 8.4 8.3 7.5 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.2 1.9 1.5 1.1 1.5 1.4 1.1 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.10 0.15 0.15 0.13 0.18 0.16 0.12 n d ]]> 1.7161 1.7167 1.7172 1.7195 1.7204 1.7205 1.7214 d ]]> ​ 52.5 53.4 52.1 53.3 51.1 52.7 52.1 Tg (°C) 650 643 643 646 646 646 637 L T (°C) 930 965 945 945 950 955 945 Tg / L T ]] 0.70 0.67 0.68 0.68 0.68 0.68 0.67 Specific gravity (g / cm3) 3 )]]> 3.91 4.09 3.97 3.97 4.14 4.12 3.93 80 (nm) ​ 363 363 362 364 362 362 362 ​ 271 270 268 267 270 270 270 10 (370nm) ​ 0.963 0.962 0.967 0.962 0.973 0.969 0.962 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [R C (grade) 1 1 1 1 1 1 1 [R A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) 2 2 2 2 2 2 2

[0127] Table 3: Examples 15-21:

[0128] Composition / mol% 15 16 17 18 19 20 21 Si 4+ ]] 4.9 2.2 3.3 3.8 4.5 2.8 2.1 Al 3+ ]]> 1.8 2 2.4 2.3 3.3 1.1 1.3 B 3+ ]]> 64 70.6 63 69 64.7 67.6 67.9 La 3+ ]] 10 12.9 11.5 9.3 11.3 11.3 10.3 Zn 2+ ]]> 9.3 3.6 11.2 5.8 4.3 6.5 10.3 Sr 2+ ]]> 7.9 5.8 6.7 5.1 8.6 5.3 5.6 Ba 2+ ]]> 1 1.5 1 1.9 0 2.1 0 Zr 4+ ]]> 1.1 1.4 0.9 2.8 3.3 3.3 2.5 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 70.7 74.8 68.7 75.1 72.5 71.5 71.3 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.10 0.06 0.09 0.09 0.12 0.06 0.05 ∑(Sr 2+ +Ba 2+ )]]> 8.9 7.3 7.7 7 8.6 7.4 5.6 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.1 1.8 1.5 1.3 1.3 1.5 1.8 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.14 0.17 0.17 0.12 0.16 0.16 0.14 n d ]]> 1.7231 1.7234 1.7237 1.7239 1.7243 1.7243 1.7245 d ]]> ​ 52.4 52.6 52.4 52.9 52.3 52.4 52.1 Tg (°C) 645 645 648 637 639 646 645 L T (°C) 955 955 950 945 945 960 940 Tg / L T ]]> 0.68 0.68 0.68 0.67 0.68 0.67 0.69 Specific gravity (g / cm3) 3 ) 4.02 4.01 4.02 3.97 1.14 4.11 4.02 80 (nm) ​ 361 361 361 362 363 363 361 ​ 268 271 272 269 268 271 271 10 (370nm) ​ 0.964 0.962 0.963 0.951 0.969 0.956 0.956 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [R C (grade) 1 1 1 1 1 1 1 [R A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) 2 2 2 2 2 2 2

[0129] Table 4: Examples 22-28:

[0130] Composition / mol% 22 23 24 25 26 27 28 Si 4+ ]] 4.7 2.5 4 3 2.9 4.6 2.5 Al 3+ ]]> 1.1 1.4 0 3.3 2.6 2 0.6 B 3+ ]]> 68 70.6 67.4 72 65.4 65.9 72.7 La 3+ ]] 12.9 9.2 11.6 8 11.4 11.6 10.6 Zn 2+ ]]> 2.2 6.2 4.4 7.8 5.6 4.8 4.1 Sr 2+ ]]> 6.8 7.9 8.7 4.7 8.8 5.4 6.4 Ba 2+ ]] 1.5 0.3 0.6 0 0 2.3 0 Zr 4+ ]]> 2.8 1.9 3.3 1.2 3.3 3.4 3.1 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 73.8 74.5 71.4 78.3 70.9 72.5 75.8 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.09 0.06 0.06 0.09 0.08 0.10 0.04 ∑(Sr 2+ +Ba 2+ )]]> 8.3 8.2 9.3 4.7 8.8 7.7 6.4 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.6 1.1 1.2 1.7 1.3 1.5 1.7 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.17 0.12 0.16 0.10 0.16 0.16 0.14 n d ]]> 1.7249 1.7253 1.7253 1.7256 1.7257 1.7262 1.7206 d ]]> ​ 52.5 51.8 52.6 52.3 52.2 52.5 52.3 Tg (°C) 648 643 639 637 643 645 645 L T (°C) 950 945 950 950 945 940 950 Tg / L T ]]> 0.68 0.68 0.67 0.67 0.68 0.69 0.68 Specific gravity (g / cm3) 3 ) 4.01 3.92 4.01 3.88 4.16 4.09 4.01 80 (nm) ​ 363 363 362 360 361 361 362 ​ 270 270 270 270 268 270 269 10 (370nm) ​ 0.963 0.965 0.968 0.954 0.972 0.955 0.963 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [R C (grade) 1 1 1 1 1 1 1 [R A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) 2 2 2 2 2 2 2

[0131] Table 5: Examples 29-35:

[0132] Composition / mol% 29 30 31 32 33 34 35 Si 4+ ]] 3.6 1 2.4 2.3 3.3 2.6 4.3 Al 3+ ]]> 4 1.9 3 2 2 0 5.4 B 3+ ]]> 66.2 67.6 68.7 65.6 70.9 66.9 68.4 La 3+ ]] 12.3 10.6 11.5 12.5 11 12.7 8.6 Zn 2+ ]]> 2.8 10.8 2.6 4.5 1.7 6.5 5.5 Sr 2+ ]]> 9 4.5 7.3 10.3 7.3 7.7 6.9 Ba 2+ ]] 0 2.9 1.8 0 2.6 2.5 0 Zr 4+ ]]> 2.1 0.7 2.7 2.8 1.2 1.1 0.9 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 73.8 70.5 74.1 69.9 76.2 69.5 78.1 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.11 0.04 0.08 0.07 0.07 0.04 0.14 ∑(Sr 2+ +Ba 2+ )]]> 9 7.4 9.1 10.3 9.9 10.2 6.9 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.4 1.4 1.3 1.2 1.1 1.2 1.2 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.17 0.15 0.16 0.18 0.14 0.18 0.11 n d ]]> 1.7232 1.7265 1.7261 1.7269 1.7276 1.728 1.729 d ]]> ​ 52.4 51.2 52.1 52.5 52.4 51.1 53.7 Tg (°C) 646 638 646 638 651 645 643 L T (°C) 950 945 950 960 940 955 955 Tg / L T ]]> 0.68 0.68 0.68 0.66 0.69 0.68 0.67 Specific gravity (g / cm3) 3 ​ 4.15 3.98 4.15 4.18 4.12 4.1 3.91 80 (nm) ​ 361 363 362 362 363 362 361 ​ 269 270 268 269 271 270 270 10 (370nm) ​ 0.967 0.955 0.967 0.979 0.965 0.963 0.965 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [R C (grade) 1 1 1 1 1 1 1 [R A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) 2 2 2 2 2 2 2

[0133] Table 6: Examples 36-42

[0134] Composition / mol% 36 37 38 39 40 41 42 Si 4+ ]]> 4.1 4.7 4.2 4.1 1.4 3.2 1.5 Al 3+ ]]> 5 3.2 2 3.5 2.8 2.7 5.7 B 3+ ]]> 59.9 64.8 65.1 62.7 68.4 62.9 62.3 La 3+ ]] 9.5 10.7 12 10.1 8.8 10.6 12.7 Zn 2+ ]]> 10.8 7.7 4.4 9 9.6 10.1 8.8 Sr 2+ ]]> 8.3 6.7 8.9 7.1 5.5 5 8.4 Ba 2+ ]]> 0.4 0.7 0 1.1 1.3 3.9 0 Zr 4+ ]]> 2 1.5 3.4 2.4 2.2 1.6 0.6 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 69 72.7 71.3 70.3 72.6 68.8 69.5 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.15 0.12 0.10 0.12 0.06 0.09 0.12 ∑(Sr 2+ +Ba 2+ )]]> 8.7 7.4 8.9 8.2 6.8 8.9 8.4 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.1 1.4 1.3 1.2 1.3 1.2 1.5 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.14 0.15 0.17 0.14 0.12 0.15 0.18 n d ]]> 1.7303 1.7309 1.73114 1.7312 1.7317 1.7325 1.7229 d ]]> ​ 52.5 51.3 51.6 52.3 51.7 51.5 52.3 Tg (°C) 643 639 637 643 643 643 639 L T (°C) 965 955 955 950 945 950 950 Tg / L T ]]> 0.67 0.67 0.67 0.68 0.68 0.68 0.67 Specific gravity (g / cm3) 3 )]]> 3.99 4.01 4.17 4.1 3.98 3.99 4.08 80 (nm) ​ 361 362 361 363 361 361 363 ​ 269 269 269 270 267 270 270 10 (370nm) ​ 0.971 0.965 0.972 0.963 0.958 0.957 0.972 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [R C (grade) 1 1 1 1 1 1 1 [R A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) 2 2 2 2 2 2 2

[0135] Table 7: Examples 43-49

[0136] Composition / mol% 43 44 45 46 47 48 49 Si 4+ ]]> 1.7 1.2 4.7 2.7 4.1 3.3 3.4 Al 3+ ]]> 2.2 2.3 3.8 3.6 1.6 0.5 4.4 B 3+ ]]> 68 63.1 66.6 67.7 69.3 71.3 63.5 La 3+ ]] 10.1 10.8 11.2 10.6 12.6 7 11.2 Zn 2+ ]]> 7.5 10.7 3.7 6 2.7 10.2 5.9 Sr 2+ ]]> 8.6 7.4 5.1 6 8.9 4.8 8.7 Ba 2+ ]]> 0 1.9 2.2 2.3 0 1.5 1.3 Zr 4+ ]]> 1.9 2.6 2.7 1.1 0.8 1.4 1.6 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 71.9 66.6 75.1 74 75 75.1 71.3 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.06 0.06 0.13 0.09 0.08 0.05 0.12 ∑(Sr 2+ +Ba 2+ )]]> 8.6 9.3 7.3 8.3 8.9 6.3 10 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.2 1.2 1.5 1.3 1.4 1.1 1.1 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.14 0.16 0.15 0.14 0.17 0.09 0.16 n d ]]> 1.7331 1.7339 1.7353 1.7355 1.7358 1.7364 1.7374 d ]]> ​ 51.6 52.4 51.9 51.4 53.1 53.7 51.4 Tg (°C) 636 642 641 636 645 647 634 L T (°C) 945 965 950 955 945 960 950 Tg / L T ]]> 0.67 0.67 0.67 0.67 0.68 0.67 0.67 Specific gravity (g / cm3) 3 )]]> 4.01 4.11 3.98 4.01 4.11 3.89 4.15 80 (nm)]]> ​ 361 361 362 363 363 362 362 ​ 269 268 272 270 270 269 269 10 (370nm) ​ 0.975 0.967 0.954 0.963 0.965 0.955 0.978 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [R C (grade) 1 1 1 1 1 1 1 [R A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) 2 2 2 2 2 2 2

[0137] Table 8: Examples 50-56

[0138] Composition / mol% 50 51 52 53 54 55 56 Si 4+ ]] 3.1 2.8 1.3 2.5 2.6 3.8 3 Al 3+ ]]> 3.6 0.5 2.9 5.5 0 6 0.5 B 3+ ]]> 66.7 68.4 71.8 70.5 62.5 62.4 70.6 La 3+ ]] 11.4 9.4 12.1 8.8 12.7 9.5 10.7 Zn 2+ ]]> 4.6 10.8 1.9 3.9 10.4 9.7 5.2 Sr 2+ ]]> 8.2 4.9 8.7 6.3 9.7 4.1 6.9 Ba 2+ ]]> 1.7 2.7 0 1.8 0.7 2.7 1.3 Zr 4+ ]]> 0.7 0.5 1.3 0.7 1.4 1.8 1.8 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 73.4 71.7 76 78.5 65.1 72.2 74.1 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.10 0.05 0.06 0.11 0.04 0.16 0.05 ∑(Sr 2+ +Ba 2+ )]]> 9.9 7.6 8.7 8.1 10.4 6.8 8.2 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.2 1.2 1.4 1.1 1.2 1.4 1.3 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.16 0.13 0.16 0.11 0.20 0.13 0.14 n d ]]> 1.7377 1.7378 1.7379 1.7324 1.7389 1.7389 1.7389 d ]]> ​ 53.7 51.3 53.7 53.9 51.9 51.1 52.1 Tg (°C) 646 643 649 643 646 648 642 L T (°C) 945 955 955 965 955 955 950 Tg / L T ]]> 0.68 0.67 0.68 0.67 0.68 0.68 0.68 Specific gravity (g / cm3) 3 )] 4.11 3.96 4.09 3.92 4.16 3.99 4.05 80 (nm)]]> ​ 361 361 362 360 361 362 363 ​ 269 269 269 272 270 267 268 10 (370nm) ​ 0.971 0.957 0.969 0.964 0.973 0.957 0.964 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [R C (grade) 1 1 1 1 1 1 1 [R A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) 2 2 2 2 2 2 2

[0139] Table 9: Examples 57-63

[0140] Composition / mol% 57 58 59 60 61 62 63 Si 4+ ]]> 1.4 3.4 4.5 2.2 2.7 4.3 4.3 Al 3+ ]]> 2 1.8 3.9 1.1 0.5 4.8 5.1 B 3+ ]]> 69.9 70.7 63.1 72.3 69.3 70.7 66.8 La 3+ ]] 11 7.4 9.8 12.3 10.9 10.4 10.2 Zn 2+ ]]> 6.9 7.2 8.1 3.2 4.8 2.4 7.3 Sr 2+ ]]> 4.8 5.6 8.7 6 9.2 5.2 5.2 Ba 2+ ]]> 2 1.2 0 1.7 0.4 0 0 Zr 4+ ]]> 2 2.7 1.9 1.2 2.2 2.2 1.1 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 73.3 75.9 71.5 75.6 72.5 79.8 76.2 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.05 0.07 0.13 0.05 0.05 0.13 0.14 ∑(Sr 2+ +Ba 2+ )]]> 6.8 6.8 8.7 7.7 9.6 5.2 5.2 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.6 1.1 1.1 1.6 1.1 2 2 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.15 0.10 0.14 0.16 0.15 0.13 0.13 n d ]]> 1.7389 1.7389 1.7392 1.7396 1.7396 1.7397 1.7397 d ]]> ​ 52.3 51.9 52.7 51.5 51.5 53.8 53.7 Tg (°C) 643 637 647 642 643 647 634 L T (°C) 955 960 955 955 955 955 950 Tg / L T ]] 0.67 0.66 0.68 0.67 0.67 0.68 0.67 Specific gravity (g / cm3) 3 ) 3.98 3.91 3.99 4.05 4.12 3.97 3.91 80 (nm)]]> ​ 362 362 364 363 362 362 361 ​ 272 269 271 270 269 270 271 10 (370nm) ​ 0.952 0.958 0.965 0.963 0.965 0.955 0.953 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [R C (grade) 1 1 1 1 1 1 1 [R A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) 2 2 2 2 2 2 2

[0141] Table 10: Examples 64-70

[0142] Composition / mol% 64 65 66 67 68 69 70 Si 4+ ]] 2.5 3.2 4.2 4 4.8 3.8 3 Al 3+ ]]> 3.6 2.5 1.8 4.8 0.6 5.1 3.2 B 3+ ]]> 66.3 63 68.3 67.2 63.7 65 62.2 La 3+ ]] 10.3 10.9 11 10.4 13.1 7.8 10.9 Zn 2+ ]]> 7.1 8.8 2.5 4.6 8 9.6 9.4 Sr 2+ ]]> 7.8 6.2 7.5 8 4.6 5.6 8.1 Ba 2+ ]] 0 2.5 2 0 4.2 0.9 1.1 Zr 4+ ]]> 2.4 2.9 2.7 1 1 2.2 2.1 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 72.4 68.7 74.3 76 69.1 73.9 68.4 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.09 0.09 0.09 0.13 0.08 0.14 0.10 ∑(Sr 2+ +Ba 2+ )]]> 7.8 8.7 9.5 8 8.8 6.5 9.2 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.3 1.3 1.2 1.3 1.5 1.2 1.2 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.14 0.16 0.15 0.14 0.19 0.11 0.16 n d ]]> 1.7398 1.7399 1.7399 1.7409 1.7412 1.7413 1.7417 d ]]> ​ 51.5 50.5 52.8 53.6 52.7 52.8 52.4 Tg (°C) 639 634 647 644 643 643 641 L T (°C) 960 945 945 955 950 955 955 Tg / L T ]]> 0.67 0.67 0.68 0.67 0.68 0.67 0.67 Specific gravity (g / cm3) 3 )]]> 4.01 4.09 4.11 3.94 4.08 3.9 4.13 80 (nm) ​ 363 363 362 363 363 361 361 ​ 272 269 272 269 270 270 272 <![CDATA[τ 10 (370nm)]]> 0.963 0.963 0.961 0.969 0.956 0.957 0.964 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [RC C (grade) 1 1 1 1 1 1 1 [RC A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) 2 2 2 2 2 2 2

[0143] Table 11: Examples 71-77

[0144] Composition / mol% 71 72 73 74 75 76 77 Si 4+ ]] 3.8 1.5 4.3 1.1 3.6 2.1 2.1 Al 3+ ]]> 6.6 2.8 1.7 4.7 3.2 6.1 4.1 B 3+ ]]> 64.3 72 72.1 69.1 70 67.9 69.5 La 3+ ]] 12.4 12.3 12.3 9.2 10.3 9.2 8.5 Zn 2+ ]] 5.8 3.7 0.8 9.1 4.9 3.6 6.4 Sr 2+ ]]> 6.1 6.7 5 3.5 6.2 8.6 4.2 Ba 2+ ]]> 0.4 0.3 1.7 2.4 0 0 3.2 Zr 4+ ]]> 0.6 0.7 2.1 0.9 1.8 2.5 2 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 74.7 76.3 78.1 74.9 76.8 76.1 75.7 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.16 0.06 0.08 0.08 0.10 0.12 0.09 ∑(Sr 2+ +Ba 2+ )]]> 6.5 7 6.7 5.9 6.2 8.6 7.4 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.9 1.8 1.8 1.6 1.7 1.1 1.1 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.17 0.16 0.16 0.12 0.13 0.12 0.11 n d ]]> 1.7418 1.7419 1.7419 1.7421 1.7421 1.7423 1.7424 d ]]> ​ 51.5 51.6 53.1 51.7 53.4 52.8 53.1 Tg (°C) 639 646 652 647 646 645 647 L T (°C) 950 945 930 960 935 965 950 Tg / L T ]]> 0.67 0.68 0.70 0.67 0.69 0.67 0.68 Specific gravity (g / cm3) 3 )]]> 3.99 4.02 3.97 3.95 3.99 3.99 3.99 80 (nm) ​ 363 362 363 363 362 361 361 ​ 270 269 270 270 270 269 269 10 (370nm) ​ 0.963 0.965 0.954 0.953 0.962 0.977 0.954 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [R C (grade) 1 1 1 1 1 1 1 [R A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) 2 2 2 2 2 2 2

[0145] Table 12: Examples 78-84

[0146] Composition / mol% 78 79 80 81 82 83 84 Si 4+ ]] 2.4 4.5 4.8 3.3 1.9 4 2.8 Al 3+ ]]> 1.2 1.2 3.2 4.8 1.4 4.2 5.1 B 3+ ]]> 73.2 66.9 64.1 63.7 65.2 63.3 63.9 La 3+ ]] 12.6 11.6 9.7 10.4 11.5 14.5 13.9 Zn 2+ ]] 0.9 5.8 7.8 7.6 8.8 3.6 3.9 Sr 2+ ]]> 8.1 8.4 7.2 7.4 6.9 9.4 7.9 Ba 2+ ]] 0 0.8 0 0 1.6 0 0 Zr 4+ ]]> 1.6 0.8 3.2 2.8 2.7 1 2.5 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 76.8 72.6 72.1 71.8 68.5 71.5 71.8 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.05 0.09 0.12 0.13 0.05 0.13 0.12 ∑(Sr 2+ +Ba 2+ )]]> 8.1 9.2 7.2 7.4 8.5 9.4 7.9 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.6 1.3 1.3 1.4 1.4 1.5 1.8 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.16 0.16 0.13 0.14 0.17 0.20 0.19 n d ]]> 1.7425 1.7434 1.7439 1.744 1.7475 1.7389 1.745 d ]]> ​ 53.7 52.1 52.3 53.1 51.5 51.4 50.9 Tg (°C) 655 637 636 643 647 647 643 L T (°C) 935 960 945 950 955 965 955 Tg / L T ]] 0.70 0.66 0.67 0.68 0.68 0.67 0.67 Specific gravity (g / cm3) 3 )]]> 4.15 4.09 4.02 4.11 4.1 4.17 4.12 80 (nm) ​ 362 361 363 362 363 363 361 ​ 269 270 272 268 270 268 268 10 (370nm) ​ 0.967 0.973 0.961 0.965 0.963 0.966 0.969 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [R C (grade) 1 1 1 1 1 1 1 [R A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) 2 2 2 2 2 2 2

[0147] Table 13: Examples 85-91

[0148] Composition / mol% 85 86 87 88 89 90 91 Si 4+ ]] 1.2 1.9 3.4 1.5 3.4 3.8 3.4 Al 3+ ]]> 0.5 5.6 3.3 4 6.7 2.6 4.8 B 3+ ]]> 77.9 66.7 67.4 72.4 65.1 68 70 La 3+ ]] 10.1 10.2 12.7 11.3 12.9 11 9.2 Zn 2+ ]]> 0.8 4.8 2.7 0.7 3.7 6.7 4.7 Sr 2+ ]]> 6.5 6.9 6.7 7.4 5 7.1 5.9 Ba 2+ ]]> 0.7 1.9 3.3 0 1.6 0 0.8 Zr 4+ ]]> 2.3 2 0.5 2.7 1.6 0.8 1.2 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 79.6 74.2 74.1 77.9 75.2 74.4 78.2 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.02 0.11 0.10 0.08 0.16 0.09 0.12 ∑(Sr 2+ +Ba 2+ )]]> 7.2 8.8 10 7.4 6.6 7.1 6.7 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.4 1.2 1.3 1.5 2 1.5 1.4 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.13 0.14 0.17 0.15 0.17 0.15 0.12 n d ]]> 1.7352 1.7463 1.7266 1.7426 1.7318 1.7473 1.7435 d ]]> ​ 53 52.3 52.7 53.2 50.5 53.8 51.3 Tg (°C) 653 647 645 656 642 642 649 L T (°C) 925 945 935 940 960 950 945 Tg / L T ]] 0.71 0.68 0.69 0.70 0.67 0.68 0.69 Specific gravity (g / cm3) 3 ) 4.01 4.06 4.13 4.05 4.02 3.98 3.92 80 (nm) ​ 362 363 362 361 361 363 363 ​ 270 270 270 268 269 270 269 10 (370nm) ​ 0.963 0.963 0.964 0.967 0.957 0.962 0.963 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [R C (grade) 1 1 1 1 1 1 1 [R A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) 2 2 2 2 2 2 2

[0149] Table 14: Examples 92-98

[0150] Composition / mol% 92 93 94 95 96 97 98 Si 4+ ]] 1.8 2.8 4.9 1.5 3 4 1.2 Al 3+ ]]> 4.2 1 2.4 1.2 2.9 5.8 4.2 B 3+ ]]> 67 73.1 63.5 65 65.1 62 67 La 3+ ]] 11.6 10.9 11.2 11.1 10.9 10.3 11.1 Zn 2+ ]]> 7.6 3.6 5.1 10 5.7 8.1 2.9 Sr 2+ ]]> 5.9 5.7 7.2 9.4 9.5 5.5 10.1 Ba 2+ ]] 1.1 0 2.4 0 0 0.8 0 Zr 4+ ]]> 0.8 2.9 3.3 1.8 2.9 3.5 3.5 Total 100 100 100 100 100 100 100 ∑(Si 4+ +B 3+ +Al 3+ )]]> 73 76.9 70.8 67.7 71 71.8 72.4 ∑(Al 3+ +Si 4+ ) / B 3+ ]]> 0.09 0.05 0.11 0.04 0.09 0.16 0.08 ∑(Sr 2+ +Ba 2+ )]]> 7 5.7 9.6 9.4 9.5 6.3 10.1 La 3+ / ∑(Ba 2+ +Sr 2+ )]]> 1.7 1.9 1.2 1.2 1.1 1.6 1.1 La 3+ / ∑(Si 4+ +B 3+ +Al 3+ )]]> 0.16 0.14 0.16 0.16 0.15 0.14 0.15 n d ]]> 1.7481 1.7424 1.7436 1.7417 1.7408 1.7391 1.7445 d ]]> ​ 50.9 53.8 52.9 51.3 51.4 51.2 51.6 Tg (°C) 647 643 641 645 639 635 645 L T (°C) 960 945 930 945 955 955 960 Tg / L T ]]> 0.67 0.68 0.69 0.68 0.67 0.66 0.67 Specific gravity (g / cm3) 3 )]]> 3.99 3.99 4.13 4.11 4.13 4.01 4.17 80 (nm) ​ 361 362 362 361 363 361 363 ​ 268 270 270 269 270 268 269 10 (370nm) ​ 0.965 0.959 0.965 0.967 0.972 0.956 0.978 D w (grade) 1 1 1 1 1 1 1 D A (grade) 3 3 3 3 3 3 3 [R C (grade) 1 1 1 1 1 1 1 [R A (grade) 2 2 2 2 2 2 2 [R OH (S) (stage) 1 1 1 1 1 1 1 RP (S) (grade) Composition / mol% Total Tg (°C) RP (S) (grade) Composition / mol% Total Tg (°C) RP (S) (grade) Composition / mol% Total Tg (°C) RP (S) (grade) Composition / mol% Total Tg (°C) RP (S) (grade) Composition / mol% Total Tg (°C) RP (S) (grade) Composition / mol% Total Tg (°C) RP (S) (grade) Composition / mol% Total Tg (°C) RP (S) (grade) Composition / mol% Total Tg (°C) RP (S) (grade) Composition / mol% Total Tg (°C) RP (S) (grade) Composition / mol% Total Tg (°C) RP (S) (grade) Composition / mol% Total Tg (°C) RP (S) (grade) Composition / mol% Total Tg (°C) RP (S) (grade) Composition / mol% Total Tg (°C) 2 2 2 2 2 2 2

[0151] From Tables 1-14, it can be seen that the glasses of the present application (Examples 1-98) have the required refractive index (n d ) and Abbe number (υ d ), a crystallization temperature lower than 1000°C, a ratio of the transformation temperature T g to the upper crystallization temperature (L T ) (T g / L T ) not less than 0.6, and can form stable glasses and can be mass-produced; a specific gravity lower than 4.20 g / cm 3 ; high internal transmittance properties, with an internal transmittance of 10 mm thick optical glass at 370 nm reaching 0.95 or more; and the optical glass of the present application also has excellent chemical stability.

[0152] It should be noted that, although the technical solutions of the present application are described with specific examples, those skilled in the art can understand that the present application should not be limited thereto.

[0153] The above has described various embodiments of the present application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles, practical application, or technical improvement in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. An optical glass, characterized by comprising: comprising the following composition in terms of mole percentage of cations: B 3+ ：59.9~80%； Si 4+ : 0.5-5%; Al 3+ ：0~7%； La 3+ : 5-15% Zn 2+ : 0~15% Ba 2+ : 0~5% Sr 2+ ：2~11%； Zr 4+ ：0.6~5%； The optical glass does not contain Li + , Na + , and Y 3+ ; the sum of the contents of Si 4+ , Al 3+ , and B 3+ , ∑(Si 4+ + Al 3+ + B 3+ ), is 63-83%, the ratio of the content of La 3+ to the sum of the contents of Ba 2+ and Sr 2+ , La 3+ / (Ba 2+ + Sr 2+ ), is 1-2; The optical glass has a refractive index of 1.71 to 1.75 and an Abbe number of 50 to 54.

2. The optical glass according to claim 1, characterized by comprising the following composition in terms of mole percentage of cations: B 3+ ：63~73%； Si 4+ : 1-4.5%; Al 3+ ：0.5~6%； La 3+ : 7-13% Zn 2+ : 1-10% Ba 2+ : 0.5-4%; Sr 2+ ：5.1~9%； Zr 4+ ：1.0~3.5%。 3. The optical glass according to claim 1 or 2, characterized by, The sum of the contents of Si 4+ , Al 3+ , and B 3+ , ∑(Si 4+ + Al 3+ + B 3+ ), is 67 to 79% in terms of mole percentage.

4. The optical glass according to claim 1 or 2, characterized by Si 4+ Al 3+ B 3+ 4+ 3+ 3+ not more than 0.20.​​​ 5. The optical glass according to claim 1 or 2, characterized by, Si 4+ Al 3+ B 3+ 4+ 3+ 3+ not more than 0.18.​​​ 6. The optical glass according to claim 1 or 2, characterized by Ba 2+ with Sr 2+ content ∑(Ba 2+ + Sr 2+ ) is 3-13%.

7. The optical glass according to claim 6, characterized by Ba, in mole percentage 2+ With Sr 2+ The sum of contents ∑(Ba 2+ +Sr 2+ The percentage is 6-10%.

8. The optical glass according to claim 1 or 2, characterized by, In mole percentage, La 3+ The content of Ba 2+ and Sr 2+ The ratio of the sum of contents of La 3+ / (Ba 2+ +Sr 2+ The value is 1.2~1.8; La 3+ The content of Si 4+ B 3+ And Al 3+ The ratio of the sum of contents of La 3+ / (Si 4+ +B 3+ +Al 3+ The value is 0.05~0.

25.

9. The optical glass according to claim 8, characterized by In mole percentage, La 3+ The content of Si 4+ B 3 + And Al 3+ The ratio of the sum of contents of La 3+ / (Si 4+ +B 3+ +Al 3+ The value is 0.10~0.

18.

10. The optical glass according to claim 1 or 2, characterized by, The optical glass further does not contain K + , Ca 2+ , Ge 4+ , Te 4+ , Gd 3+ , Ta 5+ , Ti 4+ , and W 6+ in combination of one or more of two or more.

11. The optical glass according to claim 1 or 2, characterized by, The optical glass has a crystallization temperature lower than 1000℃, a transition temperature of 655℃ or lower, and a ratio of the transition temperature to the crystallization temperature of 0.6 or higher; The internal transmittance of the optical glass at 370nm reaches 0.95 or higher.

12. A method of producing an optical glass according to any one of claims 1 to 11, characterized by, comprising: The raw materials of each component are weighed according to the proportion, mixed uniformly, then smelted, and then poured or poured into a forming mold, or directly pressed into a shape.

13. An optical element, characterized by, The optical glass according to any one of claims 1 to 11.

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