High-refraction low-dispersion optical glass

Abstract

The invention provides high-refraction low-dispersion optical glass which is relatively low in transformation temperature and relatively low in coloring degree. The optical glass with high refraction and low dispersion comprises the following components in percentage by weight: 1-10% of SiO2; 7%-18% of B2O3; 24 to 39 percent of La2O3; 4 to 17 percent of Gd2O3 and Y2O3; 8.5% to 20% of ZnO; 8.5% to 19% of Ta2O5; and 0.5 to 10% of ZrO2, wherein the ratio of ZnO to Ta2O5 is 0.6 to 1.8. Through reasonable component design, the optical glass disclosed by the invention has expected refractive index and Abbe number as well as lower coloring degree and lower transformation temperature, is suitable for precise compression molding and is beneficial to improving the imaging effect of an optical instrument.

Description

TECHNICAL FIELD

[0001] The present application relates to an optical glass, in particular to a high refractive low dispersion optical glass with low transition temperature and low coloration degree, and a glass preform, an optical element and an optical instrument made of the same. BACKGROUND

[0002] In recent years, with the progress of science and technology, the continuous updating of optoelectronic information products, the demand for optical glass gradually increases, and higher requirements for the performance of optical glass are put forward. At the same time, with the development trend of miniaturization of optical instruments, the demand for high refractive low dispersion optical glass is becoming more and more obvious. The mainstream manufacturing method of optical elements at present is precision molding (including direct molding method and secondary molding method), and the lenses manufactured by using the precision molding technology usually do not need to be ground and polished, thereby reducing the consumption of raw materials, reducing the cost of manpower and material resources, and reducing environmental pollution. This technology can produce non-spherical elements in large quantities at low cost. So-called precision molding is to mold a glass preform under certain temperature and pressure by using a high-precision mold with a predetermined product shape, so as to obtain a glass product with final product shape and optical function. The optical glass suitable for precision molding requires a lower transition temperature to inhibit the damage of high temperature environment to the mold and prolong the service life of the molding mold. On the other hand, in order to make the imaging of optical instruments clearer, the optical glass applied therein is required to have a lower coloration degree, so that the light transmittance of the optical glass is more excellent, and a better imaging effect is achieved. Patent document CN111039563A discloses an optical glass with a refractive index of 1.8000-2.0000 and an Abbe number of 25.0-45.0, which has a relatively high refractive index, but its transition temperature is relatively high, which is not conducive to precision molding, and its coloration degree is also relatively high, which is not conducive to improving the imaging effect of optical instruments. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a high refractive low dispersion optical glass with low transition temperature and low coloration degree.

[0004] The technical solution adopted by the present application to solve the technical problem is:

[0005] (1) A high refractive low dispersion optical glass, the components are represented by weight percentage, containing: SiO2: 1-10%; B2O3: 7-18%; La2O3: 24-39%; Gd2O3+Y2O3: 4-17%; ZnO: 8.5-20%; Ta2O5: 8.5-19%; ZrO2: 0.5-10%, wherein ZnO / Ta2O5 is 0.6-1.8.

[0006] (2) The high refractive low dispersive optical glass according to (1), further comprising, in terms of weight percentage: Nb2O5: more than 0% but less than or equal to 8%; and / or WO3: 0.1-8%; and / or TiO2: 0-4.5%; and / or Li2O: more than 0% but less than or equal to 7%; and / or Na2O: 0-5%; and / or K2O: 0-5%; and / or Al2O3: 0-4.5%; and / or RO: 0-4.5%; and / or Yb2O3: 0-5%; and / or GeO2: 0-3%; and / or P2O5: 0-3%; and / or fining agent: 0-1%, the RO being one or more of MgO, CaO, SrO, BaO, and the fining agent being one or more of Sb2O3, SnO2, CeO2.

[0007] (3) A high refractive low dispersive optical glass comprising, in terms of weight percentage, SiO2, B2O3, La2O3, ZnO, ZrO2 and Ta2O5, wherein ZnO / Ta2O5 is 0.6-1.8, the high refractive low dispersive optical glass having a refractive index n d of 1.82-1.88, an Abbe number v d of 36-44, a transition temperature T g of 620°C or lower, and a λ 70 of 400 nm or lower.

[0008] (4) The high refractive low dispersive optical glass according to (3), comprising, in terms of weight percentage: SiO2: 1-10%; and / or B2O3: 7-18%; and / or La2O3: 24-39%; and / or Gd2O3+Y2O3: 4-17%; and / or ZnO: 8.5-20%; and / or Ta2O5: 8.5-19%; and / or Nb2O5: more than 0% but less than or equal to 8%; and / or WO3: 0.1-8%; and / or ZrO2: 0.5-10%; and / or Li2O: more than 0% but less than or equal to 7%; and / or TiO2: 0-4.5%; and / or Na2O: 0-5%; and / or K2O: 0-5%; and / or Al2O3: 0-4.5%; and / or RO: 0-4.5%; and / or Yb2O3: 0-5%; and / or GeO2: 0-3%; and / or P2O5: 0-3%; and / or fining agent: 0-1%, the RO being one or more of MgO, CaO, SrO, BaO, and the fining agent being one or more of Sb2O3, SnO2, CeO2.

[0009] (5) The high refractive low dispersive optical glass according to any one of (1) to (4), comprising, in terms of weight percentage, one or more of the following six cases:

[0010] 1) ZnO / Ta2O5 is 0.7 to 1.5, preferably ZnO / Ta2O5 is 0.8 to 1.3, more preferably ZnO / Ta2O5 is 0.9 to 1.1;

[0011] 2) Ta2O5 / B2O3 is 0.7 to 2.5, preferably Ta2O5 / B2O3 is 0.8 to 2.0, more preferably Ta2O5 / B2O3 is 0.85 to 1.5, further preferably Ta2O5 / B2O3 is 0.9 to 1.3;

[0012] 3) B2O3 / SiO2 is 1.0 to 5.0, preferably B2O3 / SiO2 is 1.5 to 4.5, more preferably B2O3 / SiO2 is 1.8 to 4.0, further preferably B2O3 / SiO2 is 2.0 to 3.0;

[0013] 4) (Gd2O3+Y2O3) / ZrO2 is 0.6 to 4.5, preferably (Gd2O3+Y2O3) / ZrO2 is 1.0 to 4.0, more preferably (Gd2O3+Y2O3) / ZrO2 is 1.5 to 3.5, further preferably (Gd2O3+Y2O3) / ZrO2 is 2.0 to 3.0;

[0014] 5) (B2O3+ZnO) / (Gd2O3+Y2O3) is 1.0 to 6.0, preferably (B2O3+ZnO) / (Gd2O3+Y2O3) is 1.5 to 5.0, more preferably (B2O3+ZnO) / (Gd2O3+Y2O3) is 1.8 to 4.0, further preferably (B2O3+ZnO) / (Gd2O3+Y2O3) is 2.1 to 3.0;

[0015] 6) (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is 0.8 to 2.5, preferably (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is 0.8 to 2.2, more preferably (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is 1.0 to 2.0, further preferably (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is 1.1 to 1.8.

[0016] (6) The high-refractive low-dispersion optical glass according to any one of (1) to (4), whose components are expressed in terms of weight percentage, satisfies one or more of the following 7 cases:

[0017] 1) Nb2O5 / WO3 is 0.05 to 1.2, preferably Nb2O5 / WO3 is 0.05 to 1.0, more preferably Nb2O5 / WO3 is 0.1 to 0.8, further preferably Nb2O5 / WO3 is 0.2 to 0.6;

[0018] 2) WO3 / Li2O is 2.0 to 8.0, preferably WO3 / Li2O is 2.5 to 6.5, more preferably WO3 / Li2O is 2.8 to 5.5, further preferably WO3 / Li2O is 3.0 to 4.5;

[0019] 3) La2O3 / (ZnO + WO3) is 1.2 to 4.0, preferably La2O3 / (ZnO + WO3) is 1.3 to 3.5, more preferably La2O3 / (ZnO + WO3) is 1.4 to 2.5, further preferably La2O3 / (ZnO + WO3) is 1.5 to 2.0;

[0020] 4) (B2O3 + WO3) / ZrO2 is 1.0 to 8.5, preferably (B2O3 + WO3) / ZrO2 is 2.0 to 7.0, more preferably (B2O3 + WO3) / ZrO2 is 2.8 to 5.5, further preferably (B2O3 + WO3) / ZrO2 is 3.2 to 4.8;

[0021] 5) (ZnO + WO3) / B2O3 is 0.7 to 2.5, preferably (ZnO + WO3) / B2O3 is 0.8 to 2.0, more preferably (ZnO + WO3) / B2O3 is 0.9 to 1.8, further preferably (ZnO + WO3) / B2O3 is 1.0 to 1.5;

[0022] 6) (Nb2O5 + WO3) / SiO2 is 0.1 to 1.8, preferably (Nb2O5 + WO3) / SiO2 is 0.1 to 1.6, more preferably (Nb2O5 + WO3) / SiO2 is 0.2 to 1.4, further preferably (Nb2O5 + WO3) / SiO2 is 0.5 to 1.2;

[0023] 7) 10 x Li2O / ZrO2 is 1.3 to 10.0, preferably 10 x Li2O / ZrO2 is 1.5 to 8.0, more preferably 10 x Li2O / ZrO2 is 1.8 to 6.0, further preferably 10 x Li2O / ZrO2 is 2.0 to 4.0.

[0024] (7) The high-refractive low-dispersion optical glass according to any one of (1) to (4), wherein the components are represented by weight percentage, and wherein: Si02: 3 to 9%, preferably Si02: 4 to 8%; and / or B203: 9 to 16%, preferably B203: 11 to 15%; and / or La203: 26 to 36%, preferably La203: 28 to 34%; and / or Gd203 + Y203: 6 to 15%, preferably Gd203 + Y203: 8 to 13%; and / or ZnO: 10.5 to 18%, preferably ZnO: 11 to 15.5%; and / or Ta205: 10.5 to 18%, preferably Ta205: 12 to 17%; and / or Nb205: 0.1 to 5%, preferably Nb205: 0.5 to 3.5%; and / or W03: 0.5 to 6%, preferably W03: 1 to 5%; and / or Zr02: 1 to 8%, preferably Zr02: 2 to 7%; and / or Li20: 0.1 to 5%, preferably Li20: 0.6 to 3.5%; and / or Ti02: 0 to 3%, preferably Ti02: 0 to 1%; and / or Na20: 0 to 3%, preferably Na20: 0 to 1%; and / or K20: 0 to 3%, preferably K20: 0 to 1%; and / or Al203: 0 to 3%, preferably Al203: 0 to 1%; and / or RO: 0 to 3%, preferably RO: 0 to 1%; and / or Yb203: 0 to 3%, preferably Yb203: 0 to 1%; and / or Ge02: 0 to 2%, preferably Ge02: 0 to 1%; and / or P205: 0 to 1%, preferably P205: 0 to 0.5%; and / or a fining agent: 0 to 0.5%, preferably a fining agent: 0 to 0.2%, the RO being one or more of MgO, CaO, SrO, BaO, and the fining agent being one or more of Sb203, Sn02, Ce02.

[0025] (8) The high-refractive low-dispersion optical glass according to any one of (1) to (4), wherein the components are represented by weight percentage, and wherein: Gd203: 1 to 15%, preferably Gd203: 5 to 13%, more preferably Gd203: 7 to 12%; and / or Y203: 0 to 9%, preferably Y203: 0 to 5%, more preferably Y203: 0 to 3%.

[0026] (9) The high-refractive low-dispersion optical glass according to any one of (1) to (4), wherein the components do not contain Na20; and / or do not contain K20; and / or do not contain MgO; and / or do not contain CaO; and / or do not contain SrO; and / or do not contain BaO; and / or do not contain Yb203; and / or do not contain Ge02; and / or do not contain P205; and / or do not contain F.

[0027] (10) The high-refractive low-dispersion optical glass according to any one of (1) to (4), wherein the high-refractive low-dispersion optical glass has a refractive index nd is 1.82 to 1.88, preferably 1.83 to 1.87, more preferably 1.84 to 1.86, and the Abbe number v d It is 36-44, preferably 38-42, and more preferably 39-41.

[0028] (11) The high-refractive-low-dispersion optical glass according to any one of (1) to (4), wherein the thermal expansion coefficient α of the high-refractive-low-dispersion optical glass is -30 / 70℃ 85×10 -7 / K or less, preferably 80×10 -7 / K or less, more preferably 75×10 -7 / K or less, more preferably 70×10 -7 / K or less, more preferably 67×10 -7 / K or less; and / or water resistance stability D W 3 or more, preferably 2 or more, more preferably 1; and / or Knoop hardness H K 620×10 7 Pa or more, preferably 640×10 7 Pa or more, more preferably 650×10 7 Pa or above; and / or wear degree F A 80 to 120, preferably 85 to 115, more preferably 90 to 110, and even more preferably 95 to 105; and / or Young's modulus E is 10500×10 7 Pa or more, preferably 11000×10 7 Pa or more, more preferably 11500×10 7 Pa or more, more preferably 12000×10 7 Pa or above; and / or transition temperature T g The temperature is 620°C or lower, preferably 610°C or lower, more preferably 600°C or lower; and / or the bubble degree is A grade or higher, preferably A0 grade or higher, more preferably A 00 and / or weather resistance is 2 or more, preferably 1 type; and / or λ 70 400nm or less, preferably λ 70 390nm or less, more preferably λ 70 380nm or less; and / or λ5 is 360nm or less, preferably λ5 is 350nm or less, more preferably λ5 is 340nm or less; and / or density ρ is 5.30g / cm 3 Below, preferably 5.20g / cm 3 Below, more preferably 5.15g / cm 3 and / or the secondary pressing anti-crystallization performance is B level or above, preferably A level.

[0029] (12) A glass preform made of the high refractive low dispersion optical glass according to any one of (1) to (11).

[0030] (13) An optical element made of the high refractive low dispersion optical glass according to any one of (1) to (11), or made of the glass preform according to (12).

[0031] (14) An optical instrument containing the high refractive low dispersion optical glass according to any one of (1) to (11), and / or containing the optical element according to (13).

[0032] The present application has the beneficial effect that, through reasonable component design, the optical glass has a desired refractive index and Abbe number, while also having a low coloration degree and a low transition temperature, is suitable for precision mold forming, and is conducive to improving the imaging effect of optical instruments. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of the high refractive low dispersion optical glass of the present application will be described in detail, but the present application is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the object of the present application. Furthermore, with respect to repeatedly described parts, although there are appropriate omissions of descriptions, the gist of the application is not limited thereby, and in the following content, the high refractive low dispersion optical glass of the present application can be simply referred to as optical glass or glass.

[0034] [High refractive low dispersion optical glass]

[0035] Hereinafter, the range of each component (ingredient) of the high refractive low dispersion optical glass of the present application will be described. In the present application, unless otherwise specified, the content, total content, and total amount of each component are all expressed in weight percent (wt%), that is, the content, total content, and total amount of each component are expressed as a weight percentage with respect to the total amount of glass material converted into an oxide composition. Here, the "converted into an oxide composition" refers to the case where, when the oxide, complex salt, and hydroxide, etc. used as raw materials for the optical glass composition components of the present application are melted, they are decomposed and converted into an oxide.

[0036] Unless otherwise indicated in a specific case, the numerical ranges listed herein include the upper and lower limit values, "and / or" includes the end point values, and all integers and fractions within the range, and are not limited to the specific values listed in the defined range. As used herein, "and / or" is inclusive, for example, "A and / or B" means only A, or only B, or both A and B.

[0037] [Necessary components and optional components]

[0038] SiO2may improve the viscosity of the molten glass, improve the devitrification resistance and weather resistance of the glass, but if its content is too high, the melting difficulty of the glass increases, the transition temperature rises, and the refractive index is difficult to meet the design requirements. Therefore, the content of SiO2in the present application is 1-10%, preferably 3-9%, more preferably 4-8%. In some embodiments, the content of SiO2may be 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, etc., and all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range.

[0039] B2O3is a glass network former component, which can improve the melting property and devitrification resistance of the glass, and if the content of B2O3is too high, the chemical stability and light transmittance of the glass decrease, and the refractive index of the glass is difficult to meet the design requirements. Therefore, the content of B2O3in the present application is 7-18%, preferably 9-16%, more preferably 11-15%. In some embodiments, the content of B2O3may be 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, etc., and all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range.

[0040] In some embodiments, the ratio between the content of B2O3 and the content of SiO2, B2O3 / SiO2, is controlled in the range of 1.0-5.0, which can reduce the coloration of the glass while improving the secondary press molding anti-crystallization performance of the glass. Therefore, B2O3 / SiO2 is preferably 1.0-5.0, more preferably B2O3 / SiO2 is 1.5-4.5, further preferably B2O3 / SiO2 is 1.8-4.0, and more further preferably B2O3 / SiO2 is 2.0-3.0. In some embodiments, B2O3 / SiO2 can be 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, 2.0, 2.05, 2.1, 2.15, 2.2, 2.25, 2.3, 2.35, 2.4, 2.45, 2.5, 2.55, 2.6, 2.65, 2.7, 2.75, 2.8, 2.85, 2.9, 2.95, 3.0, 3.05, 3.1, 3.15, 3.2, 3.25, 3.3, 3.35, 3.4, 3.45, 3.5, 3.55, 3.6, 3.65, 3.7, 3.75, 3.8, 3.85, 3.9, 3.95, 4.0, 4.05, 4.1, 4.15, 4.2, 4.25, 4.3, 4.35, 4.4, 4.45, 4.5, 4.55, 4.6, 4.65, 4.7, 4.75, 4.8, 4.85, 4.9, 4.95, 5.0, and all ranges and subranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range.

[0041] La2O3 is a high-refractive low-dispersion component, which can increase the refractive index and adjust the dispersion of the glass, improve the stability of the glass, and reduce the high-temperature viscosity of the glass. If the content of La2O3 is too high, the anti-crystallization performance of the glass decreases and the transition temperature increases. Therefore, the content of La2O3 in the present application is 24-39%, preferably 26-36%, and more preferably 28-34%. In some embodiments, the content of La2O3 can be 24%, 24.5%, 25%, 25.5%, 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34%, 34.5%, 35%, 35.5%, 36%, 36.5%, 37%, 37.5%, 38%, 38.5%, 39%, and all ranges and subranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range.

[0042] In the present application, by containing 4-17% of Gd2O3and Y2O3, the melting property and the anti-crystallization property of the glass can be improved while maintaining high refractive index and low dispersion. Therefore, in the present application, Gd2O3+ Y2O3is 4-17%, preferably 6-15%, and more preferably 8-13%. In some embodiments, the content of Gd2O3+ Y2O3may be 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, and the like, as well as all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range.

[0043] Further, in some embodiments, Gd2O3can play a role in reducing the relative partial dispersion of the glass and improving the chemical stability, but if its content is too high, the resistance to devitrification of the glass becomes poor and the transition temperature increases. Therefore, in some embodiments, the content of Gd2O3is 1-15%, preferably 5-13%, and more preferably 7-12%. In some embodiments, the content of Gd2O3may be 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, and the like, as well as all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range. In some embodiments, Y2O3is beneficial to reducing the density of the glass, but if its content is too high, the resistance to devitrification of the glass becomes poor. Therefore, in some embodiments, the content of Y2O3is 0-9%, preferably 0-5%, and more preferably 0-3%. In some embodiments, the content of Y2O3may be 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, and the like, as well as all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range.

[0044] Yb2O3 is a high-refractive low-dispersive component. If the content of Yb2O3 exceeds 5%, the anti-crystallization property of the glass will decrease. Therefore, the content of Yb2O3 is 0-5%, preferably 0-3%, more preferably 0-1%, and further preferably no Yb2O3. In some embodiments, the content of Yb2O3 can be 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, and the like, as well as all ranges and sub-ranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range.

[0045] ZnO can improve the chemical stability of the glass, improve the weather resistance of the glass, and reduce the transition temperature of the glass. However, when the content of ZnO is too high, it will increase the erosion of platinum gold vessels during the melting process, reduce the service life of the furnace, and is not conducive to the anti-crystallization property of the glass. Therefore, the content of ZnO in the present application is 8.5-20%, preferably 10.5-18%, and more preferably 11-15.5%. In some embodiments, the content of ZnO can be 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, and the like, as well as all ranges and sub-ranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range.

[0046] In some embodiments, the ratio between the total content of B2O3, ZnO and the total content of Gd2O3, Y2O3, (B2O3+ZnO) / (Gd2O3+Y2O3) is controlled in the range of 1.0-6.0, which can improve the weather resistance of the glass while providing the glass with excellent secondary press molding anti-crystallization performance. Therefore, (B2O3+ZnO) / (Gd2O3+Y2O3) is preferably 1.0-6.0, more preferably (B2O3+ZnO) / (Gd2O3+Y2O3) is 1.5-5.0, further preferably (B2O3+ZnO) / (Gd2O3+Y2O3) is 1.8-4.0, and more further preferably (B2O3+ZnO) / (Gd2O3+Y2O3) is 2.1-3.0. In some embodiments, (B2O3+ZnO) / (Gd2O3+Y2O3) can be 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, and all ranges and subranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range.

[0047] Ta2O5 has the effect of improving the refractive index of the glass and improving the resistance to devitrification, but if its content is too high, the melting property of the glass decreases, the density increases, and the cost control of the glass raw materials is not favorable. Therefore, the content of Ta2O5 in the present application is 8.5-19%, preferably 10.5-18%, and more preferably 12-17%. In some embodiments, the content of Ta2O5 can be 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, and all ranges and subranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range.

[0048] In some embodiments, the ratio between the content of ZnO and the content of Ta2O5, ZnO / Ta2O5, is controlled in the range of 0.6-1.8, which can improve the secondary press forming crystallization resistance of the glass while reducing the coloration of the glass. Therefore, it is preferred that ZnO / Ta2O5 is in the range of 0.6-1.8, more preferably ZnO / Ta2O5 is in the range of 0.7-1.5, further preferably ZnO / Ta2O5 is in the range of 0.8-1.3, and more further preferably ZnO / Ta2O5 is in the range of 0.9-1.1. In some embodiments, ZnO / Ta2O5 can be 0.6, 0.63, 0.65, 0.67, 0.7, 0.73, 0.75, 0.77, 0.8, 0.83, 0.85, 0.87, 0.9, 0.93, 0.95, 0.97, 1.0, 1.03, 1.05, 1.07, 1.1, 1.13, 1.15, 1.17, 1.2, 1.23, 1.25, 1.27, 1.3, 1.33, 1.35, 1.37, 1.4, 1.43, 1.45, 1.47, 1.5, 1.53, 1.55, 1.57, 1.6, 1.63, 1.65, 1.67, 1.7, 1.73, 1.75, 1.77, 1.8, and all ranges and sub-ranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range.

[0049] In some embodiments, the ratio between the content of Ta2O5and the content of B2O3, Ta2O5 / B2O3, is controlled in the range of 0.7-2.5, which can reduce the transition temperature of the glass while increasing the bubble degree of the glass. Thus, Ta2O5 / B2O3is preferably in the range of 0.7-2.5, more preferably in the range of 0.8-2.0, further preferably in the range of 0.85-1.5, and more further preferably in the range of 0.9-1.3. In some embodiments, Ta2O5 / B2O3may be 0.7, 0.73, 0.75, 0.77, 0.8, 0.83, 0.85, 0.87, 0.9, 0.93, 0.95, 0.97, 1.0, 1.03, 1.05, 1.07, 1.1, 1.13, 1.15, 1.17, 1.2, 1.23, 1.25, 1.27, 1.3, 1.33, 1.35, 1.37, 1.4, 1.43, 1.45, 1.47, 1.5, 1.53, 1.55, 1.57, 1.6, 1.63, 1.65, 1.67, 1.7, 1.73, 1.75, 1.77, 1.8, 1.83, 1.85, 1.87, 1.9, 1.93, 1.95, 1.97, 2.0, 2.03, 2.05, 2.07, 2.1, 2.13, 2.15, 2.17, 2.2, 2.23, 2.25, 2.27, 2.3, 2.33, 2.35, 2.37, 2.4, 2.43, 2.45, 2.47, 2.5, and all ranges and sub-ranges between the above values. It should be understood that in embodiments, any of the above ranges can be combined with any other range.

[0050] In some embodiments, the ratio between the total content of La2O3, Gd2O3, Y2O3, La2O3+Gd2O3+Y2O3, and the total content of ZnO, Ta2O5, ZnO+Ta2O5, (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5), is controlled in the range of 0.8-2.5, which is beneficial to improve the chemical stability of the glass, and make the glass have a lower density. Therefore, it is preferred that (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is 0.8-2.5, more preferably (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is 0.8-2.2, further preferably (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is 1.0-2.0, and more further preferably (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is 1.1-1.8. In some embodiments, (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) can be 0.8, 0.83, 0.85, 0.87, 0.9, 0.93, 0.95, 0.97, 1.0, 1.03, 1.05, 1.07, 1.1, 1.13, 1.15, 1.17, 1.2, 1.23, 1.25, 1.27, 1.3, 1.33, 1.35, 1.37, 1.4, 1.43, 1.45, 1.47, 1.5, 1.53, 1.55, 1.57, 1.6, 1.63, 1.65, 1.67, 1.7, 1.73, 1.75, 1.77, 1.8, 1.83, 1.85, 1.87, 1.9, 1.93, 1.95, 1.97, 2.0, 2.03, 2.05, 2.07, 2.1, 2.13, 2.15, 2.17, 2.2, 2.23, 2.25, 2.27, 2.3, 2.33, 2.35, 2.37, 2.4, 2.43, 2.45, 2.47, 2.5, and the like, and all ranges and subranges between the above values. It should be understood that in embodiments, any of the above ranges can be combined with any other range.

[0051] WO3 can increase the refractive index of the glass, decrease the transition temperature of the glass, and improve the glass's resistance to devitrification, but if its content is too high, the glass's coloration increases and the visible light transmittance decreases. Therefore, the content of WO3 in the present application is 0.1-8%, preferably 0.5-6%, and more preferably 1-5%. In some embodiments, the content of WO3 can be 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, etc., as well as all ranges and sub-ranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range.

[0052] In some embodiments, the ratio between the total content of ZnO and WO3 (ZnO+WO3) and the content of B2O3, (ZnO+WO3) / B2O3, is controlled in the range of 0.7-2.5, which can increase the hardness of the glass while preventing the transition temperature of the glass from increasing. Therefore, (ZnO+WO3) / B2O3 is preferably 0.7-2.5, more preferably (ZnO+WO3) / B2O3 is 0.8-2.0, further preferably (ZnO+WO3) / B2O3 is 0.9-1.8, and more further preferably (ZnO+WO3) / B2O3 is 1.0-1.5. In some embodiments, (ZnO+WO3) / B2O3 can be 0.7, 0.73, 0.75, 0.77, 0.8, 0.83, 0.85, 0.87, 0.9, 0.93, 0.95, 0.97, 1.0, 1.03, 1.05, 1.07, 1.1, 1.13, 1.15, 1.17, 1.2, 1.23, 1.25, 1.27, 1.3, 1.33, 1.35, 1.37, 1.4, 1.43, 1.45, 1.47, 1.5, 1.53, 1.55, 1.57, 1.6, 1.63, 1.65, 1.67, 1.7, 1.73, 1.75, 1.77, 1.8, 1.83, 1.85, 1.87, 1.9, 1.93, 1.95, 1.97, 2.0, 2.03, 2.05, 2.07, 2.1, 2.13, 2.15, 2.17, 2.2, 2.23, 2.25, 2.27, 2.3, 2.33, 2.35, 2.37, 2.4, 2.43, 2.45, 2.47, 2.5, etc., as well as all ranges and sub-ranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range.

[0053] In some embodiments, the ratio between the content of La2O3and the total content of ZnO, WO3, ZnO+WO3, is controlled in the range of 1.2 to 4.0, which can improve the bubble degree of the glass while preventing the weather resistance of the glass from deteriorating. Therefore, it is preferred that La2O3 / (ZnO+WO3) is 1.2 to 4.0, more preferred that La2O3 / (ZnO+WO3) is 1.3 to 3.5, further preferred that La2O3 / (ZnO+WO3) is 1.4 to 2.5, and more further preferred that La2O3 / (ZnO+WO3) is 1.5 to 2.0. In some embodiments, La2O3 / (ZnO+WO3) can be 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, 2.0, 2.05, 2.1, 2.15, 2.2, 2.25, 2.3, 2.35, 2.4, 2.45, 2.5, 2.55, 2.6, 2.65, 2.7, 2.75, 2.8, 2.85, 2.9, 2.95, 3.0, 3.05, 3.1, 3.15, 3.2, 3.25, 3.3, 3.35, 3.4, 3.45, 3.5, 3.55, 3.6, 3.65, 3.7, 3.75, 3.8, 3.85, 3.9, 3.95, 4.0, and all ranges and subranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any of the other ranges.

[0054] Nb2O5is an essential component of the glass of the present application, which has the effects of increasing the refractive index of the glass, adjusting the dispersion, and improving the chemical stability, but if its content is too high, the glass resistance to devitrification decreases. Therefore, the content of Nb2O5is greater than 0% but less than or equal to 8%, preferably 0.1 to 5%, and more preferably 0.5 to 3.5%. In some embodiments, the content of Nb2O5may be greater than 0%, 0.01%, 0.05%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, and all ranges and subranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any of the other ranges.

[0055] In some embodiments, the ratio between the content of Nb2O5and the content of WO3, Nb2O5 / WO3, is controlled in the range of 0.05-1.2, which can improve the Young's modulus of the glass while providing the glass with better abrasion resistance. Thus, it is preferred that Nb2O5 / WO3is in the range of 0.05-1.2, more preferably, Nb2O5 / WO3is in the range of 0.05-1.0, even more preferably, Nb2O5 / WO3is in the range of 0.1-0.8, and even more preferably, Nb2O5 / WO3is in the range of 0.2-0.6. In some embodiments, Nb2O5 / WO3may be 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.13, 0.15, 0.17, 0.2, 0.23, 0.25, 0.27, 0.3, 0.33, 0.35, 0.37, 0.4, 0.43, 0.45, 0.47, 0.5, 0.53, 0.55, 0.57, 0.6, 0.63, 0.65, 0.67, 0.7, 0.73, 0.75, 0.77, 0.8, 0.83, 0.85, 0.87, 0.9, 0.93, 0.95, 0.97, 1.0, 1.03, 1.05, 1.07, 1.1, 1.13, 1.15, 1.17, 1.2, and the like, as well as all ranges and sub-ranges between the aforementioned values. It is to be understood that in embodiments, any of the aforementioned ranges can be combined with any of the other ranges.

[0056] In some embodiments, the ratio between the total content of Nb2O5, WO3 and the content of SiO2, (Nb2O5+WO3) / SiO2, is controlled in the range of 0.1 to 1.8, which can improve the Young's modulus of the glass while preventing the weather resistance of the glass from deteriorating. Therefore, (Nb2O5+WO3) / SiO2 is preferably in the range of 0.1 to 1.8, more preferably in the range of 0.1 to 1.6, further preferably in the range of 0.2 to 1.4, and more further preferably in the range of 0.5 to 1.2. In some embodiments, (Nb2O5+WO3) / SiO2 can be 0.1, 0.13, 0.15, 0.17, 0.2, 0.23, 0.25, 0.27, 0.3, 0.33, 0.35, 0.37, 0.4, 0.43, 0.45, 0.47, 0.5, 0.53, 0.55, 0.57, 0.6, 0.63, 0.65, 0.67, 0.7, 0.73, 0.75, 0.77, 0.8, 0.83, 0.85, 0.87, 0.9, 0.93, 0.95, 0.97, 1.0, 1.03, 1.05, 1.07, 1.1, 1.13, 1.15, 1.17, 1.2, 1.23, 1.25, 1.27, 1.3, 1.33, 1.35, 1.37, 1.4, 1.43, 1.45, 1.47, 1.5, 1.53, 1.55, 1.57, 1.6, 1.63, 1.65, 1.67, 1.7, 1.73, 1.75, 1.77, 1.8, and the like, as well as all ranges and subranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any of the other ranges.

[0057] TiO2 can improve the refractive index and dispersion of the glass, and improve the stability of the glass. However, if the content of TiO2 is too high, the visible light transmittance of the glass will decrease, and the glass is prone to crystallization during the press molding process. Therefore, the content of TiO2 in the present application is 0 to 4.5%, preferably 0 to 3%, and more preferably 0 to 1%. In some embodiments, the content of TiO2 can be 0%, greater than 0%, 0.01%, 0.05%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, and the like, as well as all ranges and subranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any of the other ranges.

[0058] Zr02can improve the refractive index and resistance to devitrification of the glass, improve the chemical stability and mechanical properties of the glass, if the content is too high, the melting difficulty of the glass increases, which is easy to cause the inclusion in the glass and the decrease of light transmittance, and also reduces the anti-crystallization performance of the glass. Therefore, the content of Zr02in the present application is 0.5-10%, preferably 1-8%, more preferably 2-7%. In some embodiments, the content of Zr02may be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, etc., and all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range.

[0059] In some embodiments, the ratio between the total content of B203, WO3, B203+WO3, and the content of Zr02, (B203+WO3) / Zr02, is controlled in the range of 1.0-8.5, which can improve the hardness of the glass while making the glass have better abrasion resistance. Therefore, (B203+WO3) / Zr02is preferably 1.0-8.5, more preferably (B203+WO3) / Zr02is 2.0-7.0, further preferably (B203+WO3) / Zr02is 2.8-5.5, more further preferably (B203+WO3) / Zr02is 3.2-4.8. In some embodiments, (B203+WO3) / Zr02may be 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8.0, 8.1, 8.2, 8.3, 8.4, 8.5, etc., and all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range.

[0060] In some embodiments, the ratio between the total content of Gd2O3, Y2O3, (Gd2O3+Y2O3) and the content of ZrO2, (Gd2O3+Y2O3) / ZrO2, is controlled in the range of 0.6 to 4.5, which can increase the hardness of the glass while preventing the increase of the transition temperature of the glass. Therefore, it is preferred that (Gd2O3+Y2O3) / ZrO2 is in the range of 0.6 to 4.5, more preferred that (Gd2O3+Y2O3) / ZrO2 is in the range of 1.0 to 4.0, further preferred that (Gd2O3+Y2O3) / ZrO2 is in the range of 1.5 to 3.5, and more further preferred that (Gd2O3+Y2O3) / ZrO2 is in the range of 2.0 to 3.0. In some embodiments, (Gd2O3+Y2O3) / ZrO2 can be 0.6, 0.63, 0.65, 0.67, 0.7, 0.73, 0.75, 0.77, 0.8, 0.83, 0.85, 0.87, 0.9, 0.93, 0.95, 0.97, 1.0, 1.03, 1.05, 1.07, 1.1, 1.13, 1.15, 1.17, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, 2.0, 2.05, 2.1, 2.15, 2.2, 2.25, 2.3, 2.35, 2.4, 2.45, 2.5, 2.55, 2.6, 2.65, 2.7, 2.75, 2.8, 2.85, 2.9, 2.95, 3.0, 3.05, 3.1, 3.15, 3.2, 3.25, 3.3, 3.35, 3.4, 3.45, 3.5, 3.55, 3.6, 3.65, 3.7, 3.75, 3.8, 3.85, 3.9, 3.95, 4.0, 4.05, 4.1, 4.15, 4.2, 4.25, 4.3, 4.35, 4.4, 4.45, 4.5, and all ranges and sub-ranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range.

[0061] Li2O is an essential component of the glass of the present application, which can reduce the transition temperature of the glass and improve the melting property of the glass. However, if the content of Li2O is too high, the glass will have poor anti-crystallization property and the refractive index of the glass will be difficult to meet the design requirements. Therefore, the content of Li2O is greater than 0% but less than or equal to 7%, preferably 0.1-5%, more preferably 0.6-3.5%. In some embodiments, the content of Li2O can be greater than 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, and all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range.

[0062] In some embodiments, controlling 10xLi2O / ZrO2in the range of 1.3-10.0 can improve the hardness of the glass while making the glass have good abrasion resistance. Therefore, preferably, 10xLi2O / ZrO2is 1.3-10.0, more preferably 10xLi2O / ZrO2is 1.5-8.0, further preferably 10xLi2O / ZrO2is 1.8-6.0, more further preferably 10xLi2O / ZrO2is 2.0-4.0. In some embodiments, 10xLi2O / ZrO2may be 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8.0, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9.0, 9.1, 9.2, 9.3, 9.4, 9.5, 9.6, 9.7, 9.8, 9.9, 10.0, and all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range.

[0063] In some embodiments, the ratio between the content of WO3and the content of Li2O, WO3 / Li2O, is controlled in the range of 2.0-8.0, which can reduce the coefficient of thermal expansion of the glass while increasing the bubble degree of the glass. Therefore, it is preferred that WO3 / Li2O is in the range of 2.0-8.0, more preferred that WO3 / Li2O is in the range of 2.5-6.5, further preferred that WO3 / Li2O is in the range of 2.8-5.5, and more further preferred that WO3 / Li2O is in the range of 3.0-4.5. In some embodiments, WO3 / Li2O can be 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8.0, and all ranges and sub-ranges between the above values. It should be understood that in embodiments, any of the above ranges can be combined with any other range.

[0064] Na2O and K2O can improve the melting property of the glass, adjust the optical constant of the glass, but if the content is too high, the chemical stability and anti-crystallization performance of the glass will rapidly decrease, and the volatilization of the glass during the melting and forming stage will sharply increase. The volatilized substances will fall into the glass liquid during the melting and forming process, which can easily lead to the scrapping of the product. Therefore, the content of Na2O in the present application is 0-5%, preferably 0-3%, more preferably 0-1%, and further preferably no Na2O is contained. The content of K2O is 0-5%, preferably 0-3%, more preferably 0-1%, and further preferably no K2O is contained. In some embodiments, the content of Na2O can be 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, and all ranges and subranges between the above values. It should be understood that in embodiments, any of the above ranges can be combined with any other range. In some embodiments, the content of K2O can be 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, and all ranges and subranges between the above values. It should be understood that in embodiments, any of the above ranges can be combined with any other range.

[0065] Al2O3 can reduce the thermal expansion coefficient of the glass, improve the anti-crystallization and thermal stability of the glass, but if the content of Al2O3 is too high, the glass transition temperature will increase, and the melting property of the glass will become poor. Therefore, the content of Al2O3 in the present application is 0-4.5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, the content of Al2O3 can be 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, and all ranges and subranges between the above values. It should be understood that in embodiments, any of the above ranges can be combined with any other range.

[0066] RO (RO is one or more of MgO, CaO, SrO, and BaO) can improve the melting property of the glass, adjust the optical constant of the glass, and reduce the devitrification resistance of the glass if its content exceeds 4.5%. Therefore, the content of RO in the present application is 0-4.5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred to not contain MgO, and / or not contain CaO, and / or not contain SrO, and / or not contain BaO. In some embodiments, the content of MgO can be 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, etc., and all ranges and subranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range. In some embodiments, the content of CaO can be 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, etc., and all ranges and subranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range. In some embodiments, the content of SrO can be 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, etc., and all ranges and subranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range. In some embodiments, the content of BaO can be 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, etc., and all ranges and subranges between the aforementioned values. It should be understood that in embodiments, any of the aforementioned ranges can be combined with any other range.

[0067] Ge02 has the effect of increasing the refractive index and the devitrification resistance of the glass, but if its content is too high, the chemical stability of the glass decreases; on the other hand, compared with other components, Ge02 is very expensive in price, and from the perspective of the cost of glass raw materials, its use amount should be reduced as much as possible. Therefore, the content of Ge02 in the present application is 0-3%, preferably 0-2%, more preferably 0-1%, and further preferably does not contain Ge02. In some embodiments, the content of Ge02 can be 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, etc., as well as all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range.

[0068] P205 can improve the devitrification resistance of the glass, but if its content is too high, the chemical stability of the glass decreases. Therefore, the content of P205 is 0-3%, preferably 0-1%, more preferably 0-0.5%, and further preferably does not contain P205. In some embodiments, the content of P205 can be 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, etc., as well as all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range.

[0069] In the present invention, by containing 0-1% of one or more components of Sb203, Sn02, Ce02as fining agent, the fining effect of the glass can be improved, and the glass bubble degree can be improved. Preferably, the content of the fining agent is 0-0.5%, more preferably, the content of the fining agent is 0-0.2%. When the content of Sb203 exceeds 1%, the glass has a tendency to reduce the fining performance, and at the same time, due to its strong oxidation effect, it promotes the corrosion of platinum or platinum alloy vessels for melting the glass and the deterioration of the forming mold, therefore, in the present invention, the content of Sb203 is preferably 0-1%, more preferably 0-0.5%, and further preferably 0-0.2%. In some embodiments, the content of Sb203 can be 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc., as well as all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range. Sn02can also be used as a fining agent, but when its content exceeds 1%, the glass has a tendency to increase the coloration, or when the glass is heated, softened and formed by mold pressing or other re-shaping, Sn becomes the starting point for the generation of crystal nuclei, and has a tendency to produce devitrification. Therefore, in the present invention, the content of Sn02is preferably 0-1%, more preferably 0-0.5%, and further preferably 0-0.2%. In some embodiments, the content of Sn02can be 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc., as well as all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range. The role and content of Ce02are consistent with those of Sn02, and the content of Ce02is preferably 0-1%, more preferably 0-0.5%, and further preferably 0-0.2%. In some embodiments, the content of Ce02can be 0%, greater than 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc., as well as all ranges and sub-ranges between the above-mentioned values. It should be understood that in embodiments, any of the above-mentioned ranges can be combined with any other range.

[0070] <Components not to be contained>

[0071] The glass of the present application is colored by the oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo, even if they are contained in small amounts alone or in combination, and the glass absorbs specific wavelengths in the visible region, thereby reducing the effect of the present application of increasing the visible light transmittance, and thus, for optical glasses that require transmittance of visible light, it is preferable that they are not actually contained.

[0072] The oxides of Th, Cd, Tl, Os, Be, and Se have a tendency to be controlled in use as harmful chemical substances in recent years, and measures for environmental protection are necessary not only in the manufacturing process of the glass, but also in the processing process and disposal after productization. Thus, in the case where the influence on the environment is taken into consideration, it is preferable that they are not actually contained except for inevitable mixing. Thus, the optical glass becomes practically free from substances that pollute the environment. Thus, the optical glass of the present application can be manufactured, processed, and discarded without taking special measures for environmental countermeasures.

[0073] F (fluorine) reduces the refractive index of the glass, and is not favorable for obtaining a high refractive index glass, and volatilization of F during melting of the glass raw material causes problems such as deterioration of the striation of the glass and pollution of the environment, and thus, it is preferable that the optical glass of the present application does not contain F. In order to achieve environmental friendliness, the optical glass of the present application preferably does not contain As2O3 and PbO.

[0074] The "does not contain" and "0%" described herein mean that the compound, molecule, or element, etc. is not intentionally added as a raw material to the optical glass of the present application; however, as a raw material and / or equipment for producing the optical glass, there can be some impurities or components that are not intentionally added and are contained in small amounts or traces in the final optical glass, and such a case is also within the scope of the present application.

[0075] Next, the properties of the high refractive low dispersion optical glass of the present application will be described.

[0076] <Refractive index and Abbe number>

[0077] The refractive index (n d ) and Abbe number (v d ) of the optical glass were measured according to the method prescribed in the national standard "GB / T 7962.1-2010".

[0078] In some embodiments, the lower limit of the refractive index (n d ) of the high refractive low dispersion optical glass of the present application is 1.82, preferably the lower limit is 1.83, and more preferably the lower limit is 1.84. In some embodiments, the refractive index (n d) can be 1.82, 1.823, 1.825, 1.827, 1.83, 1.833, 1.835, 1.837, 1.84, 1.843, 1.845, 1.847, 1.85, 1.853, 1.855, 1.857, 1.86, 1.863, 1.865, 1.867, 1.87, 1.873, 1.875, 1.877, 1.88, and the like, as well as all ranges and sub-ranges between the aforementioned values. d ) can be 1.82, 1.823, 1.825, 1.827, 1.83, 1.833, 1.835, 1.837, 1.84, 1.843, 1.845, 1.847, 1.85, 1.853, 1.855, 1.857, 1.86, 1.863, 1.865, 1.867, 1.87, 1.873, 1.875, 1.877, 1.88, and the like, as well as all ranges and sub-ranges between the aforementioned values.

[0079] In some embodiments, the Abbe number (ν d ) of the high-refractive low-dispersion optical glass of the present application has a lower limit of 36, preferably a lower limit of 38, more preferably a lower limit of 39. In some embodiments, the Abbe number (ν d ) of the optical glass of the present application has an upper limit of 44, preferably an upper limit of 42, more preferably an upper limit of 41. In some embodiments, the Abbe number (ν d ) can be 36, 36.3, 36.5, 36.7, 37, 37.3, 37.5, 37.7, 38, 38.3, 38.5, 38.7, 39, 39.3, 39.5, 39.7, 40, 40.3, 40.5, 40.7, 41, 41.3, 41.5, 41.7, 42, 42.3, 42.5, 42.7, 43, 43.3, 43.5, 43.7, 44, and the like, as well as all ranges and sub-ranges between the aforementioned values.

[0080] <coefficient of thermal expansion>

[0081] The coefficient of thermal expansion (α -30 / 70℃ ) of the optical glass is tested according to the method specified in the national standard GB / T 7962.16-2010, and the data at -30-70℃ is obtained.

[0082] In some embodiments, the coefficient of thermal expansion (α -30 / 70℃ ) of the high-refractive low-dispersion optical glass of the present application is 85x10 -7 / K or less, preferably 80x10 -7 / K or less, more preferably 75x10 -7 / K or less, further preferably 70x10 -7 / K or less, more further preferably 67x10 -7 / K or less. In some embodiments, the coefficient of thermal expansion (α -30 / 70℃ ) can be 85x10 -7 / K, 84x10 -7 / K, 83x10 -7 / K, 82 x 10 -7 / K, 81 x 10 -7 / K, 80 x 10 -7 / K, 79 x 10 -7 / K, 78 x 10 -7 / K, 77 x 10 -7 / K, 76 x 10 -7 / K, 75 x 10 -7 / K, 74 x 10 -7 / K, 73 x 10 -7 / K, 72 x 10 -7 / K, 71 x 10 -7 / K, 70 x 10 -7 / K, 69 x 10 -7 / K, 68 x 10 -7 / K, 67 x 10 -7 / K, 66 x 10 -7 / K, 65 x 10 -7 / K, 64 x 10 -7 / K, 63 x 10 -7 / K, 62 x 10 -7 / K, 61 x 10 -7 / K, 60 x 10 -7 / K, 59 x 10 -7 / K, 58 x 10 -7 / K, and all ranges and subranges between the above values.

[0083] <Water resistance stability>

[0084] The water resistance stability (D W ) of the optical glass was tested according to the method specified in the national standard GB / T 17129 (powder method).

[0085] In some embodiments, the water resistance stability (D W ) of the high refractive low dispersive optical glass of the present application is Class 3 or above, preferably Class 2 or above, and more preferably Class 1.

[0086] <Weather resistance>

[0087] The weather resistance (CR) of the optical glass was tested as follows: the sample was placed in a test box with a saturated water vapor environment with a relative humidity of 90%, and was alternately cycled every 1 h at 40-50°C for 15 cycles. The weather resistance class was divided according to the change in haze before and after the sample was placed, and the weather resistance classification is shown in Table 1:

[0088] Table 1.

[0089]

[0090] In some embodiments, the weather resistance (CR) of the high-refractive low-dispersion optical glass of the present application is Class 2 or above, preferably Class 1.

[0091] <Knoop hardness>

[0092] The Knoop hardness (H K ) of the optical glass is tested according to the test method specified in the national standard GB / T 7962.18-2010. In the present application, the Knoop hardness can be referred to simply as hardness.

[0093] In some embodiments, the Knoop hardness (H K ) of the optical glass of the present application is 620 x 10 7 Pa or above, preferably 640 x 10 7 Pa or above, more preferably 650 x 10 7 Pa or above. In some embodiments, the Knoop hardness (H K ) can be 620 x 10 7 Pa, 625 x 10 7 Pa, 630 x 10 7 Pa, 635 x 10 7 Pa, 640 x 10 7 Pa, 645 x 10 7 Pa, 650 x 10 7 Pa, 655 x 10 7 Pa, 660 x 10 7 Pa, 665 x 10 7 Pa, 670 x 10 7 Pa, 675 x 10 7 Pa, etc., as well as all ranges and sub-ranges between the above-mentioned values.

[0094] <Air bubble degree>

[0095] The air bubble degree of the optical glass is tested according to the method specified in the national standard GB / T 7962.8-2010.

[0096] In some embodiments, the air bubble degree of the high-refractive low-dispersion optical glass of the present application is Class A or above, preferably Class A0 or above, more preferably Class A 00 .

[0097] <Density>

[0098] The density (p) of the optical glass is tested according to the method specified in the national standard GB / T 7962.20-2010.

[0099] In some embodiments, the density (p) of the high refractive low dispersive optical glass of the present application is 5.30 g / cm3 3 More preferably, the density (p) is 5.15 g / cm3 3 More preferably, the density (p) is 5.15 g / cm3 3 In some embodiments, the density (p) can be 5.30 g / cm3 3 , 5.29 g / cm3 3 , 5.28 g / cm3 3 , 5.27 g / cm3 3 , 5.26 g / cm3 3 , 5.25 g / cm3 3 , 5.24 g / cm3 3 , 5.23 g / cm3 3 , 5.22 g / cm3 3 , 5.21 g / cm3 3 , 5.20 g / cm3 3 , 5.19 g / cm3 3 , 5.18 g / cm3 3 , 5.17 g / cm3 3 , 5.16 g / cm3 3 , 5.15 g / cm3 3 , 5.14 g / cm3 3 , 5.13 g / cm3 3 , 5.12 g / cm3 3 , 5.11 g / cm3 3 , 5.10 g / cm3 3 , 5.09 g / cm3 3 , 5.08 g / cm3 3 , 5.07 g / cm3 3 , 5.06 g / cm3 3 , 5.05 g / cm3 3 and all ranges and subranges therebetween.

[0100] <Young's modulus>

[0101] Young's modulus (E) is measured by ultrasonic testing of the longitudinal wave velocity and the transverse wave velocity, and is calculated according to the following formula.

[0102]

[0103] G = V S 2 p

[0104] wherein: E is Young's modulus, Pa;

[0105] G is shear modulus, Pa;

[0106] V T is a velocity of a transverse wave, m / s;

[0107] V S is a velocity of a longitudinal wave, m / s;

[0108] ρ is a density of the glass, g / cm 3 .

[0109] In some embodiments, the Young's modulus (E) of the high-refractive low-dispersive optical glass of the present application is 10500 x 10 7 Pa or more, preferably 11000 x 10 7 Pa or more, more preferably 11500 x 10 7 Pa or more, further preferably 12000 x 10 7 Pa or more. In some embodiments, the Young's modulus (E) can be 10500 x 10 7 Pa, 10600 x 10 7 Pa, 10700 x 10 7 Pa, 10800 x 10 7 Pa, 10900 x 10 7 Pa, 11000 x 10 7 Pa, 11100 x 10 7 Pa, 11200 x 10 7 Pa, 11300 x 10 7 Pa, 11400 x 10 7 Pa, 11500 x 10 7 Pa, 11600 x 10 7 Pa, 11700 x 10 7 Pa, 11800 x 10 7 Pa, 11900 x 10 7 Pa, 12000 x 10 7 Pa, 12100 x 10 7 Pa, 12200 x 10 7 Pa, 12300 x 10 7 Pa, 12400 x 10 7 Pa, 12500 x 10 7 Pa, and all ranges and subranges between the above values.

[0110] <degree of abrasion>

[0111] The degree of abrasion (F A ) of the optical glass refers to a value obtained by multiplying the ratio of the amount of abrasion of a sample to that of a standard sample (H-K9 glass) by 100 under the same conditions, and is expressed by the following formula:

[0112] F A = V / V0 x 100 = (W / p) / (W0 / p0) x 100

[0113] In the formula: V - volume loss of the measured sample;

[0114] V0 - volume loss of the standard sample;

[0115] W - mass loss of the measured sample;

[0116] W0 - mass loss of the standard sample;

[0117] p - density of the measured sample;

[0118] p0 - density of the standard sample.

[0119] In some embodiments, the abrasion degree (F A ) of the high-refractive low-dispersion optical glass of the present application has a lower limit of 80, preferably a lower limit of 85, more preferably a lower limit of 90, and further preferably a lower limit of 95. In some embodiments, the abrasion degree (F A ) of the high-refractive low-dispersion optical glass of the present application has an upper limit of 120, preferably an upper limit of 115, more preferably an upper limit of 110, and further preferably an upper limit of 105. In some embodiments, the abrasion degree (F A ) can be 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, and the like, as well as all ranges and sub-ranges between the above-mentioned values.

[0120] <Transition Temperature>

[0121] The transition temperature (T g ) of the optical glass is tested according to the method specified in the national standard GB / T 7962.16-2010.

[0122] In some embodiments, the transition temperature (T g ) of the high-refractive low-dispersion optical glass of the present application is below 620℃, preferably below 610℃, and more preferably below 600℃. In some embodiments, the transition temperature (T g) can be 580°C, 583°C, 585°C, 587°C, 590°C, 593°C, 595°C, 597°C, 600°C, 603°C, 605°C, 607°C, 610°C, 613°C, 615°C, 617°C, 620°C, and the like, as well as all ranges and subranges therebetween.

[0123] <Staining degree>

[0124] The short wavelength transmission spectral characteristics of the glass of the present application are expressed by a staining degree (λ 70 and λ5). λ 70 is the wavelength at which the transmittance of the glass reaches 70%. The determination of λ 70 is performed using a glass having a thickness of 10 ± 0.1 mm with two opposite faces parallel to each other and optically polished, the spectral transmittance is determined in the wavelength range from 280 nm to 700 nm and the wavelength at which the transmittance is 70% is expressed. The spectral transmittance or transmittance is the quantity expressed by I in / I out when a light having an intensity I out perpendicularly incident on the above-mentioned surface of the glass, transmits through the glass and exits from one face with an intensity I in and also includes the transmittance of the surface reflection loss on the above-mentioned surface of the glass. The higher the refractive index of the glass, the greater the surface reflection loss. Therefore, in optical glasses, a small value of λ 70 means that the glass itself is little stained and the light transmittance is high.

[0125] The same applies to λ5.

[0126] In some embodiments, the λ 70 of the high refractive low dispersive optical glass of the present application is 400 nm or less, preferably λ 70 is 390 nm or less, more preferably λ 70 is 380 nm or less. In some embodiments, the λ 70 of the optical glass can be 365 nm, 366 nm, 367 nm, 368 nm, 369 nm, 370 nm, 371 nm, 372 nm, 373 nm, 374 nm, 375 nm, 376 nm, 377 nm, 378 nm, 379 nm, 380 nm, 381 nm, 382 nm, 383 nm, 384 nm, 385 nm, 386 nm, 387 nm, 388 nm, 389 nm, 390 nm, 391 nm, 392 nm, 393 nm, 394 nm, 395 nm, 396 nm, 397 nm, 398 nm, 399 nm, 400 nm, and the like, as well as all ranges and subranges therebetween.

[0127] In some embodiments, the high-refractive low-dispersion optical glass of the present application has a λ5 of 360 nm or less, preferably a λ5 of 350 nm or less, and more preferably a λ5 of 340 nm or less. In some embodiments, the optical glass can have a λ5 of 325 nm, 326 nm, 327 nm, 328 nm, 329 nm, 330 nm, 331 nm, 332 nm, 333 nm, 334 nm, 335 nm, 336 nm, 337 nm, 338 nm, 339 nm, 340 nm, 341 nm, 342 nm, 343 nm, 344 nm, 345 nm, 346 nm, 347 nm, 348 nm, 349 nm, 350 nm, 351 nm, 352 nm, 353 nm, 354 nm, 355 nm, 356 nm, 357 nm, 358 nm, 359 nm, 360 nm, and the like, as well as all ranges and sub-ranges between the aforementioned values.

[0128] [Secondary press molding anti-crystallization performance]

[0129] The test method for the secondary press molding anti-crystallization performance is as follows: the sample glass is cut into a size of 20 x 20 x 10 mm, and is placed in a muffle furnace at a temperature of T g +(180-250) °C for 15-30 minutes (the present application uses 800 °C for 15 minutes), and after being taken out and cooled, the glass surface and interior are observed for the presence or absence of devitrification or crystal particles. If the glass sample has no devitrification and crystal particles, the glass has excellent secondary press molding anti-crystallization performance.

[0130] In the secondary press molding anti-crystallization performance test, according to the aforementioned test method, the glass surface has no devitrification or crystallization particles and the interior has no crystal particles, which is recorded as "A", the glass interior has no crystallization particles but the surface layer has devitrification or crystallization particles, which is recorded as "B" (the devitrification or crystallization particles on the surface of the glass during secondary press molding can be removed by grinding, but this can increase the grinding cost), the glass interior has 1-10 crystal particles, which is recorded as "C", the glass interior has 10-20 crystal particles, which is recorded as "D", and the interior has 20 or more dense crystallization particles, which is recorded as "X".

[0131] In some embodiments, the secondary press molding anti-crystallization performance of the high-refractive low-dispersion optical glass of the present application is grade B or higher, and preferably grade A.

[0132] [Manufacturing method of high-refractive low-dispersion optical glass]

[0133] The high-refractive low-dispersion optical glass of the present application is produced by the following method: The glass of the present application is produced by using conventional raw materials and processes, including but not limited to using oxides, hydroxides, complex salts (such as carbonates, nitrates, sulfates, etc.), boric acid, etc. as raw materials, and after batching according to conventional methods, the batched materials are put into a melting furnace (such as a platinum or platinum alloy crucible) at 1150 to 1450°C for melting, and after being clarified and homogenized, a homogeneous molten glass without bubbles and undissolved substances is obtained, which is cast in a mold and annealed to form the glass. Those skilled in the art can appropriately select raw materials, process methods and process parameters according to actual needs.

[0134] [Glass preform and optical element]

[0135] A glass preform can be made from the produced high-refractive low-dispersion optical glass using, for example, direct drop molding, or a means of machining by grinding, or a means of compression molding such as hot pressing. That is, a glass precision preform can be made by directly precision drop molding of a molten optical glass, or a glass preform can be made by machining such as grinding and polishing, or a glass preform can be made by reheating and compression molding of a preform blank for compression molding of an optical glass, followed by machining by grinding. Note that the means of making a glass preform is not limited to the above means.

[0136] As described above, the high-refractive low-dispersion optical glass of the present application is useful for various optical elements and optical designs, and among them, it is particularly preferable to form a preform blank from the high-refractive low-dispersion optical glass of the present application, and to use the preform blank for reheating and compression molding, precision punch molding, etc. to make optical elements such as lenses and prisms.

[0137] The glass preform and the optical element of the present application are both formed from the above-described high-refractive low-dispersion optical glass of the present application. The glass preform of the present application has the excellent properties possessed by optical glasses; the optical element of the present application has the excellent properties possessed by optical glasses, and can provide various optical elements such as lenses and prisms that are high in optical value.

[0138] As examples of lenses, various lenses such as concave meniscus lenses, convex meniscus lenses, lenticular lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses, whose lens surfaces are spherical or aspherical, can be given.

[0139] [Optical instrument]

[0140] The optical element formed from the high-refractive low-dispersion optical glass of the present application can be used to make optical instruments such as photographic equipment, video recording equipment, projection equipment, display equipment, vehicle-mounted equipment, and monitoring equipment.

[0141] Examples

[0142] <High refractive low dispersion optical glass embodiment>

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

[0144] In this embodiment, the optical glass having the composition shown in Tables 2 to 4 was obtained by the manufacturing method of the high refractive low dispersion optical glass described above. In addition, the properties of each glass were measured by the test method described in the present application, and the measurement results are shown in Tables 2 to 4.

[0145] Table 2.

[0146]

[0147]

[0148] Table 3.

[0149]

[0150]

[0151]

[0152] Table 4.

[0153]

[0154]

[0155] <Glass preform embodiment>

[0156] The glass obtained in the high refractive low dispersion optical glass embodiments 1 to 18 was used to manufacture various lenses, prisms, etc. such as concave meniscus lenses, convex meniscus lenses, double convex lenses, double concave lenses, plano-convex lenses, plano-concave lenses, etc. using a grinding process, or a molding process such as reheat press molding, precision press molding, etc.

[0157] <Optical element embodiment>

[0158] The preforms obtained in the glass preform embodiment described above were annealed to reduce the internal stress of the glass while fine-tuning the refractive index so that the optical properties such as the refractive index reach the desired values.

[0159] Next, each preform was ground and polished to manufacture various lenses, prisms, etc. such as concave meniscus lenses, convex meniscus lenses, double convex lenses, double concave lenses, plano-convex lenses, plano-concave lenses, etc. The surface of the obtained optical element can also be coated with an anti-reflection film.

[0160] <Optical instrument embodiment>

[0161] The optical elements produced according to the above embodiments of the optical elements can be used, for example, in imaging devices, sensors, microscopes, medical technology, digital projection, communication, optical communication technology / information transmission, optics / illumination in the automotive sector, lithography technology, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices comprising such circuits and chips, by optical design, by using one or more optical elements to form an optical component or optical assembly.

Claims

1. High refractive index and low dispersion optical glass, characterized in that: Its components, expressed in weight percentage, include: SiO2: 1-10%; B2O3: 7-18%; La2O3: 24-39%; Gd2O3+Y2O3: 4-17%; ZnO: 8.5-20%; Ta2O5: 8.5-19%; ZrO2: 0.5-10%, wherein the ZnO / Ta2O5 ratio is 0.6-1.

8.

2. The high-refractive and low-dispersion optical glass according to claim 1, characterized in that: Its components, expressed in weight percentage, further contain: Nb2O5: greater than 0% but less than or equal to 8%; and / or WO3: 0.1-8%; and / or TiO2: 0-4.5%; and / or Li2O: greater than 0% but less than or equal to 7%; and / or Na2O: 0-5%; and / or K2O: 0-5%; and / or Al2O3: 0-4.5%; and / or RO: 0-4.5%; and / or Yb2O3: 0-5%; and / or GeO2: 0-3%; and / or P2O5: 0-3%; and / or clarifier: 0-1%, wherein RO is one or more of MgO, CaO, SrO, and BaO, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

3. High refractive index and low dispersion optical glass, characterized in that: Its components include SiO2, B2O3, La2O3, ZnO, ZrO2 and Ta2O5, and its components are expressed in weight percentage, wherein ZnO / Ta2O5 is 0.6 to 1.8, and the refractive index n of the high refractive and low dispersion optical glass is d is 1.82~1.88, Abbe number v d 36~44, transition temperature T g Below 620℃, λ 70 Below 400nm.

4. The high-refractive and low-dispersion optical glass according to claim 3, characterized in that: The composition thereof is expressed in weight percentage and contains: SiO2: 1-10%; and / or B2O3: 7-18%; and / or La2O3: 24-39%; and / or Gd2O3+Y2O3: 4-17%; and / or ZnO: 8.5-20%; and / or Ta2O5: 8.5-19%; and / or Nb2O5: greater than 0% but less than or equal to 8%; and / or WO3: 0.1-8%; and / or ZrO2: 0.5-10%; and / or Li2O: greater than 0% but less than or equal to 7%; and / or TiO2: 0-4.5%; and / or Na2O: 0-5%; and / or K2O: 0-5%; and / or Al2O3: 0-4.5%; and / or RO: 0-4.5%; and / or Yb2O3: 0-5%; and / or GeO2: 0-3%; and / or P2O5: 0-3%; and / or clarifier: 0-1%, wherein RO is one or more of MgO, CaO, SrO and BaO, and the clarifier is one or more of Sb2O3, SnO2 and CeO2.

5. The high-refractive-low-dispersion optical glass according to any one of claims 1 to 4, characterized in that: Its components are expressed in weight percentage and meet one or more of the following six conditions: 1) ZnO / Ta2O5 is 0.7 to 1.5, preferably ZnO / Ta2O5 is 0.8 to 1.3, and more preferably ZnO / Ta2O5 is 0.9 to 1.1; 2) Ta2O5 / B2O3 is 0.7 to 2.5, preferably Ta2O5 / B2O3 is 0.8 to 2.0, more preferably Ta2O5 / B2O3 is 0.85 to 1.5, and further preferably Ta2O5 / B2O3 is 0.9 to 1.3; 3) B2O3 / SiO2 is 1.0 to 5.0, preferably B2O3 / SiO2 is 1.5 to 4.5, more preferably B2O3 / SiO2 is 1.8 to 4.0, and further preferably B2O3 / SiO2 is 2.0 to 3.0; 4) (Gd2O3+Y2O3) / ZrO2 is 0.6 to 4.5, preferably (Gd2O3+Y2O3) / ZrO2 is 1.0 to 4.0, more preferably (Gd2O3+Y2O3) / ZrO2 is 1.5 to 3.5, and further preferably (Gd2O3+Y2O3) / ZrO2 is 2.0 to 3.0; 5) (B2O3+ZnO) / (Gd2O3+Y2O3) is 1.0-6.0, preferably (B2O3+ZnO) / (Gd2O3+Y2O3) is 1.5-5.0, more preferably (B2O3+ZnO) / (Gd2O3+Y2O3) is 1.8-4.0, and further preferably (B2O3+ZnO) / (Gd2O3+Y2O3) is 2.1-3.0; 6)(La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is 0.8~2.5, preferably (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is 0.8~2.2, more preferably (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is 1.0~2.0, and further preferably (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is 1.1~1.

8.

6. The high-refractive and low-dispersion optical glass according to any one of claims 1 to 4, characterized in that: Its components are expressed in weight percentage and meet one or more of the following 7 conditions: 1) Nb2O5 / WO3 is 0.05 to 1.2, preferably Nb2O5 / WO3 is 0.05 to 1.0, more preferably Nb2O5 / WO3 is 0.1 to 0.8, and further preferably Nb2O5 / WO3 is 0.2 to 0.6; 2) WO3 / Li2O is 2.0 to 8.0, preferably WO3 / Li2O is 2.5 to 6.5, more preferably WO3 / Li2O is 2.8 to 5.5, and further preferably WO3 / Li2O is 3.0 to 4.5; 3) La2O3 / (ZnO+WO3) is 1.2 to 4.0, preferably La2O3 / (ZnO+WO3) is 1.3 to 3.5, more preferably La2O3 / (ZnO+WO3) is 1.4 to 2.5, and further preferably La2O3 / (ZnO+WO3) is 1.5 to 2.0; 4) (B2O3+WO3) / ZrO2 is 1.0 to 8.5, preferably (B2O3+WO3) / ZrO2 is 2.0 to 7.0, more preferably (B2O3+WO3) / ZrO2 is 2.8 to 5.5, and further preferably (B2O3+WO3) / ZrO2 is 3.2 to 4.8; 5) (ZnO + WO3) / B2O3 is 0.7 to 2.5, preferably (ZnO + WO3) / B2O3 is 0.8 to 2.0, more preferably (ZnO + WO3) / B2O3 is 0.9 to 1.8, and further preferably (ZnO + WO3) / B2O3 is 1.0 to 1.5; 6) (Nb2O5+WO3) / SiO2 is 0.1 to 1.8, preferably (Nb2O5+WO3) / SiO2 is 0.1 to 1.6, more preferably (Nb2O5+WO3) / SiO2 is 0.2 to 1.4, and further preferably (Nb2O5+WO3) / SiO2 is 0.5 to 1.2; 7) 10×Li2O / ZrO2 is 1.3 to 10.0, preferably 10×Li2O / ZrO2 is 1.5 to 8.0, more preferably 10×Li2O / ZrO2 is 1.8 to 6.0, and further preferably 10×Li2O / ZrO2 is 2.0 to 4.

0.

7. The high-refractive and low-dispersion optical glass according to any one of claims 1 to 4, characterized in that: The components are expressed in weight percentage, wherein: SiO2: 3-9%, preferably SiO2: 4-8%; and / or B2O3: 9-16%, preferably B2O3: 11-15%; and / or La2O3: 26-36%, preferably La2O3: 28-34%; and / or Gd2O3+Y2O3: 6-15%, preferably Gd2O3+Y2O3: 8-13%; and / or ZnO: 10.5-1 8%, preferably ZnO: 11-15.5%; and / or Ta2O5: 10.5-18%, preferably Ta2O5: 12-17%; and / or Nb2O5: 0.1-5%, preferably Nb2O5: 0.5-3.5%; and / or WO3: 0.5-6%, preferably WO3: 1-5%; and / or ZrO2: 1-8%, preferably ZrO2: 2-7%; and / or Li2O: 0.1-5%, Preferably Li2O: 0.6-3.5%; and / or TiO2: 0-3%, preferably TiO2: 0-1%; and / or Na2O: 0-3%, preferably Na2O: 0-1%; and / or K2O: 0-3%, preferably K2O: 0-1%; and / or Al2O3: 0-3%, preferably Al2O3: 0-1%; and / or RO: 0-3%, preferably RO: 0-1%; and / or Yb2O3: 0-3 %, preferably Yb2O3: 0-1%; and / or GeO2: 0-2%, preferably GeO2: 0-1%; and / or P2O5: 0-1%, preferably P2O5: 0-0.5%; and / or clarifier: 0-0.5%, preferably clarifier: 0-0.2%, the RO is one or more of MgO, CaO, SrO, and BaO, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

8. The high-refractive and low-dispersion optical glass according to any one of claims 1 to 4, characterized in that: Its components are expressed in weight percentage, wherein: Gd2O3: 1-15%, preferably Gd2O3: 5-13%, more preferably Gd2O3: 7-12%; and / or Y2O3: 0-9%, preferably Y2O3: 0-5%, more preferably Y2O3: 0-3%.

9. The high-refractive and low-dispersion optical glass according to any one of claims 1 to 4, characterized in that: Its components do not contain Na2O; and / or do not contain K2O; and / or do not contain MgO; and / or do not contain CaO; and / or do not contain SrO; and / or do not contain BaO; and / or do not contain Yb2O3; and / or do not contain GeO2; and / or do not contain P2O5; and / or do not contain F.

10. The high-refractive and low-dispersion optical glass according to any one of claims 1 to 4, characterized in that: The refractive index n of the high refractive and low dispersion optical glass is d is 1.82 to 1.88, preferably 1.83 to 1.87, more preferably 1.84 to 1.86, and the Abbe number v d It is 36-44, preferably 38-42, and more preferably 39-41.

11. The high-refractive and low-dispersion optical glass according to any one of claims 1 to 4, characterized in that: The thermal expansion coefficient α of the high-refractive and low-dispersion optical glass -30 / 70℃ 85×10 -7 / K or less, preferably 80×10 -7 / K or less, more preferably 75×10 -7 / K or less, more preferably 70×10 -7 / K or less, more preferably 67×10 -7 / K or less; and / or water resistance stability D W 3 or more, preferably 2 or more, more preferably 1; and / or Knoop hardness H K 620×10 7 Pa or more, preferably 640×10 7 Pa or more, more preferably 650×10 7 Pa or above; and / or wear degree F A 80 to 120, preferably 85 to 115, more preferably 90 to 110, and even more preferably 95 to 105; and / or Young's modulus E is 10500×10 7 Pa or more, preferably 11000×10 7 Pa or more, more preferably 11500×10 7 Pa or more, more preferably 12000×10 7 Pa or above; and / or transition temperature T g The temperature is 620°C or lower, preferably 610°C or lower, more preferably 600°C or lower; and / or the bubble degree is A grade or higher, preferably A0 grade or higher, more preferably A 00 and / or weather resistance is 2 or more, preferably 1 type; and / or λ 70 400nm or less, preferably λ 70 390nm or less, more preferably λ 70 380nm or less; and / or λ5 is 360nm or less, preferably λ5 is 350nm or less, more preferably λ5 is 340nm or less; and / or density ρ is 5.30g / cm 3 Below, preferably 5.20g / cm 3 Below, more preferably 5.15g / cm 3 and / or the secondary pressing anti-crystallization performance is B level or above, preferably A level.

12. A glass preform, characterized in that: The optical glass is made of the high-refractive and low-dispersion optical glass according to any one of claims 1 to 11.

13. An optical element, characterized in that The optical glass is made of the high-refractive and low-dispersion optical glass according to any one of claims 1 to 11, or the glass preform according to claim 12.

14. An optical instrument, characterized in that Contains the high-refractive-low-dispersion optical glass according to any one of claims 1 to 11, and / or contains the optical element according to claim 13.

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