Optical glass, optical element and optical instrument

Abstract

The invention provides optical glass which is relatively high in hardness and relatively low in thermal expansion coefficient. The optical glass 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; nb2O5: greater than 0% but less than or equal to 8%; wO3: 0.1 to 8%; zrO2: 0.5 to 10 percent; the ratio of WO3 to Li2O is 2.0 to 8.0, and the ratio of 10 * Li2O to ZrO2 is 1.3 to 10.0. Through reasonable component design, the optical glass has high refractive index, low dispersion, low thermal expansion coefficient and high hardness, and can be widely applied to high-performance optical instruments.

Description

TECHNICAL FIELD

[0001] The present application relates to an optical glass, in particular to an optical glass with high hardness and low thermal expansion coefficient, and an optical element and an optical instrument made therefrom. BACKGROUND

[0002] In recent years, with the rapid development of smart phones, monitoring security, vehicle imaging, VR (virtual reality), AR (augmented reality) and other technologies, the demand for optical elements mounted on these devices continues to increase. High refractive index low dispersion optical glass is an optical material that can be widely used in these instruments. Lenses formed of high refractive index low dispersion glass can correct chromatic aberration and achieve compactness of the optical system by being combined with lenses formed of ultra-low dispersion glass and the like. Therefore, high refractive index low dispersion glass plays a very important role as an optical element constituting a camera optical system, a projection optical system such as a projector, and the like. Optical glass used in vehicle-mounted, monitoring security and other fields has high requirements for hardness to resist the wear and impact of sand during vehicle travel and to prolong the service life of the optical glass.

[0003] Optical elements installed in vehicle-mounted optical instruments, and optical elements installed in optical instruments such as projectors, copiers, laser printers and the like that generate heat are used in environments with large temperature changes. If the thermal expansion coefficient of the optical glass is too large, thermal expansion of the optical element occurs due to changes in the ambient temperature. Because the expansion coefficient is different from that of the optical element fixing clamp, stress is generated in the optical element, and birefringence is further generated, causing changes in the imaging characteristics. Therefore, it is desirable for the optical glass to have a low thermal expansion coefficient. Patent document No. JP2020-531207 discloses a high refractive index low dispersion optical glass with a high thermal expansion coefficient, which is not suitable for application in optical instruments in environments with large temperature changes. SUMMARY

[0004] The technical problem to be solved by the present application is to provide an optical glass with high hardness and low thermal expansion coefficient.

[0005] The technical solution adopted by the present application to solve the technical problem is:

[0006] (1) An optical glass comprising, in terms of weight percentage, SiO2: 1 to 10%; B2O3: 7 to 18%; La2O3: 24 to 39%; Gd2O3+ Y2O3: 4 to 17%; ZnO: 8.5 to 20%; Ta2O5: 8.5 to 19%; Nb2O5: more than 0% but less than or equal to 8%; WO3: 0.1 to 8%; ZrO2: 0.5 to 10%; Li2O: more than 0% but less than or equal to 7%, wherein WO3 / Li2O is 2.0 to 8.0 and 10 x Li2O / ZrO2 is 1.3 to 10.0.

[0007] (2) The optical glass according to (1), further comprising, in terms of weight percentage, TiO2: 0 to 4.5%; and / or Na2O: 0 to 5%; and / or K2O: 0 to 5%; and / or Al2O3: 0 to 4.5%; and / or RO: 0 to 4.5%, the RO being one or more of MgO, CaO, SrO, BaO; and / or Yb2O3: 0 to 5%; and / or GeO2: 0 to 3%; and / or P2O5: 0 to 3%; and / or a fining agent: 0 to 1%, the fining agent being one or more of Sb2O3, SnO2, CeO2.

[0008] (3) An optical glass comprising, in terms of weight percentage, SiO2, B2O3, La2O3, ZnO, Ta2O5, Nb2O5, WO3, ZrO2, and Li2O, wherein WO3 / Li2O is 2.0 to 8.0 and 10 x Li2O / ZrO2 is 1.3 to 10.0, the optical glass having a refractive index n d of 1.82 to 1.875, an Abbe number v d of 36 to 44, a thermal expansion coefficient a -30 / 70℃ of 81 x 10 -7 / K or less, and a Knoop hardness H K of 620 x 10 7 Pa or more.

[0009] (4) The optical glass according to (3), which contains, in terms of weight percentage, Si02: 1 to 10%; and / or B203: 7 to 18%; and / or La203: 24 to 39%; and / or Gd203+ Y203: 4 to 17%; and / or ZnO: 8.5 to 20%; and / or Ta205: 8.5 to 19%; and / or Nb205: more than 0% but less than or equal to 8%; and / or W03: 0.1 to 8%; and / or Zr02: 0.5 to 10%; and / or Li20: more than 0% but less than or equal to 7%; and / or Ti02: 0 to 4.5%; and / or Na20: 0 to 5%; and / or K20: 0 to 5%; and / or Al203: 0 to 4.5%; and / or RO: 0 to 4.5%; and / or Yb203: 0 to 5%; and / or Ge02: 0 to 3%; and / or P205: 0 to 3%; and / or fining agent: 0 to 1%, the RO being one or more of MgO, CaO, SrO, BaO, and the fining agent being one or more of Sb203, Sn02, Ce02.

[0010] (5) The optical glass according to any one of (1) to (4), which contains, in terms of weight percentage, satisfies one or more of the following 13 cases:

[0011] 1) W03 / Li20 is 2.5 to 6.5, preferably W03 / Li20 is 2.8 to 5.5, more preferably W03 / Li20 is 3.0 to 4.5;

[0012] 2) 10 x Li20 / Zr02is 1.5 to 8.0, preferably 10 x Li20 / Zr02is 1.8 to 6.0, more preferably 10 x Li20 / Zr02is 2.0 to 4.0;

[0013] 3) ZnO / Ta205is 0.6 to 1.8, preferably ZnO / Ta205is 0.7 to 1.5, more preferably ZnO / Ta205is 0.8 to 1.3, further preferably ZnO / Ta205is 0.9 to 1.1;

[0014] 4) Ta205 / B203is 0.7 to 2.5, preferably Ta205 / B203is 0.8 to 2.0, more preferably Ta205 / B203is 0.85 to 1.5, further preferably Ta205 / B203is 0.9 to 1.3;

[0015] 5) Nb205 / W03is 0.05 to 1.2, preferably Nb205 / W03is 0.05 to 1.0, more preferably Nb205 / W03is 0.1 to 0.8, further preferably Nb205 / W03is 0.2 to 0.6;

[0016] 6) B203 / Si02is 1.0 to 5.0, preferably B203 / Si02is 1.5 to 4.5, more preferably B203 / Si02is 1.8 to 4.0, further preferably B203 / Si02is 2.0 to 3.0;

[0017] 7) (Gd203+ Y203) / Zr02is 0.6 to 4.5, preferably (Gd203+ Y203) / Zr02is 1.0 to 4.0, more preferably (Gd203+ Y203) / Zr02is 1.5 to 3.5, further preferably (Gd203+ Y203) / Zr02is 2.0 to 3.0;

[0018] 8) (B203+ ZnO) / (Gd203+ Y203) is 1.0 to 6.0, preferably (B203+ ZnO) / (Gd203+ Y203) is 1.5 to 5.0, more preferably (B203+ ZnO) / (Gd203+ Y203) is 1.8 to 4.0, further preferably (B203+ ZnO) / (Gd203+ Y203) is 2.1 to 3.0;

[0019] 9) La203 / (ZnO + W03) is 1.2 to 4.0, preferably La203 / (ZnO + W03) is 1.3 to 3.5, more preferably La203 / (ZnO + W03) is 1.4 to 2.5, further preferably La203 / (ZnO + W03) is 1.5 to 2.0;

[0020] 10) (B203+ W03) / Zr02is 1.0 to 8.5, preferably (B203+ W03) / Zr02is 2.0 to 7.0, more preferably (B203+ W03) / Zr02is 2.8 to 5.5, further preferably (B203+ W03) / Zr02is 3.2 to 4.8;

[0021] 11) (La203+ Gd203+ Y203) / (ZnO + Ta205) is 0.8 to 2.5, preferably (La203+ Gd203+ Y203) / (ZnO + Ta205) is 0.8 to 2.2, more preferably (La203+ Gd203+ Y203) / (ZnO + Ta205) is 1.0 to 2.0, further preferably (La203+ Gd203+ Y203) / (ZnO + Ta205) is 1.1 to 1.8;

[0022] 12) (ZnO + W03) / B203is 0.7 to 2.5, preferably (ZnO + W03) / B203is 0.8 to 2.0, more preferably (ZnO + W03) / B203is 0.9 to 1.8, further preferably (ZnO + W03) / B203is 1.0 to 1.5;

[0023] 13) (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.

[0024] (6) The optical glass according to any one of (1) to (4), wherein the components are represented by weight percentage, wherein: SiO2: 3 to 9%, preferably SiO2: 4 to 8%; and / or B2O3: 9 to 16%, preferably B2O3: 11 to 15%; and / or La2O3: 26 to 36%, preferably La2O3: 28 to 34%; and / or Gd2O3 + Y2O3: 6 to 15%, preferably Gd2O3 + Y2O3: 8 to 13%; and / or ZnO: 10.5 to 18%, preferably ZnO: 11 to 15.5%; and / or Ta2O5: 10.5 to 18%, preferably Ta2O5: 12 to 17%; and / or Nb2O5: 0.1 to 5%, preferably Nb2O5: 0.5 to 3.5%; and / or WO3: 0.5 to 6%, preferably WO3: 1 to 5%; and / or ZrO2: 1 to 8%, preferably ZrO2: 2 to 7%; and / or Li2O: 0.1 to 5%, preferably Li2O: 0.6 to 3.5%; and / or TiO2: 0 to 3%, preferably TiO2: 0 to 1%; and / or Na2O: 0 to 3%, preferably Na2O: 0 to 1%; and / or K2O: 0 to 3%, preferably K2O: 0 to 1%; and / or Al2O3: 0 to 3%, preferably Al2O3: 0 to 1%; and / or RO: 0 to 3%, preferably RO: 0 to 1%; and / or Yb2O3: 0 to 3%, preferably Yb2O3: 0 to 1%; and / or GeO2: 0 to 2%, preferably GeO2: 0 to 1%; and / or P2O5: 0 to 1%, preferably P2O5: 0 to 0.5%; and / or fining agent: 0 to 0.5%, preferably 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 Sb2O3, SnO2, CeO2.

[0025] (7) The optical glass according to any one of (1) to (4), wherein the components are represented by weight percentage, wherein: Gd2O3: 1 to 15%, preferably Gd2O3: 5 to 13%, more preferably Gd2O3: 7 to 12%; and / or Y2O3: 0 to 9%, preferably Y2O3: 0 to 5%, more preferably Y2O3: 0 to 3%.

[0026] (8) The optical glass according to any one of (1) to (4), which does not contain Na2O; and / or does not contain K2O; and / or does not contain MgO; and / or does not contain CaO; and / or does not contain SrO; and / or does not contain BaO; and / or does not contain Yb2O3; and / or does not contain GeO2; and / or does not contain P2O5; and / or does not contain F.

[0027] (9) The optical glass according to any one of (1) to (4), which has a refractive index n d of 1.82 to 1.875, preferably 1.83 to 1.87, more preferably 1.84 to 1.86; and / or an Abbe number v d of 36 to 44, preferably 38 to 42, more preferably 39 to 41; and / or a thermal expansion coefficient α -30 / 70℃ of 81 x 10 -7 / K or less, preferably 78 x 10 -7 / K or less, more preferably 75 x 10 -7 / K or less, further preferably 70 x 10 -7 / K or less, more further preferably 67 x 10 -7 / K or less; and / or a water resistance stability D W of Class 3 or more, preferably Class 2 or more, more preferably Class 1; and / or a Knoop hardness H K of 620 x 10 7 Pa or more, preferably 640 x 10 7 Pa or more, more preferably 650 x 10 7 Pa or more; and / or an abrasion degree F A of 80 to 120, preferably 85 to 115, more preferably 90 to 110, further preferably 95 to 105; and / or a Young's modulus E of 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; and / or a transition temperature T g of 620°C or less, preferably 610°C or less, more preferably 600°C or less; and / or a bubble degree of Class A or more, preferably Class A0 or more, more preferably Class A 00 ; and / or a weather resistance of Class 2 or more, preferably Class 1; and / or a λ 70 of 400 nm or less, preferably a λ 70 of 390 nm or less, more preferably a λ 70λ5 is 380 nm or less; and / or λ5 is 360 nm or less, preferably λ5 is 350 nm or less, more preferably λ5 is 340 nm or less; and / or the density p is 5.30 g / cm 3 more preferably 5.15 g / cm 3 more preferably 5.15 g / cm 3 and / or the secondary pressure type anti-crystallization performance is B class or more, preferably A class.

[0028] (10) A glass preform made of the optical glass described in any one of (1) to (9).

[0029] (11) An optical element made of the optical glass described in any one of (1) to (9), or made of the glass preform described in (10).

[0030] (12) An optical instrument containing the optical glass described in any one of (1) to (9), and / or containing the optical element described in (11).

[0031] The present application has the following advantageous effects: through reasonable component design, the optical glass of the present application has high refractive index and low dispersion, and also has low thermal expansion coefficient and high hardness, and can be widely applied in high-performance optical instruments. DETAILED DESCRIPTION

[0032] Hereinafter, the embodiments of the 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 by appropriately changing within the scope of the object of the present application. In addition, regarding the repeatedly described parts, although there are appropriately omitted descriptions, the gist of the present application will not be limited thereby, and in the following content, the optical glass of the present application can be simply referred to as glass.

[0033] [Optical glass]

[0034] Hereinafter, the range of each component (ingredient) of the optical glass of the present application will be described. In the present application, if not otherwise specified, the content, the total content, and the total amount of each component are all expressed by weight percentage (wt%), that is, the content, the total content, and the total amount of each component are expressed by weight percentage with respect to the total amount of the glass material converted into oxide composition. Here, the "converted into oxide composition" means that, in the case where the oxide, the complex salt, and the hydroxide, etc. used as raw materials of the optical glass composition component of the present application are decomposed and converted into oxide when melted, the total amount of the oxide is taken as 100%.

[0035] Unless otherwise indicated herein, ranges of values listed herein include the upper and lower values, whether the specification states the range explicitly, whether the description states the range implicitly, and whether the description states the range parametrically, as well as any and all subranges and / or subcategories falling therein. The term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated items, including but not limited to any single item. The term "comprising" as used herein is synonymous with "including", "containing", or "comprising", and is inclusive or open-ended and does not exclude additional, unrecited elements or method steps.

[0036] <Essential and Optional Components>

[0037] SiO2can improve the viscosity of molten glass, improve the devitrification resistance and weather resistance of glass, but if its content is too high, the melting difficulty of 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., as well as all ranges and subranges 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.

[0038] B2O3is a glass network former component, which can improve the melting property and devitrification resistance of 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., as well as all ranges and subranges 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] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] In some embodiments, the ratio between the total content of B2O3, ZnO, B2O3+ZnO, and the total content of Gd2O3, Y2O3, 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 making the glass have excellent secondary compression 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 above values. It should be understood that in embodiments, any of the above ranges can be combined with any other range.

[0046] 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 material 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 above values. It should be understood that in embodiments, any of the above ranges can be combined with any other range.

[0047] 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.

[0048] 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.

[0049] 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 in the range of 0.8-2.5, more preferably (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is in the range of 0.8-2.2, further preferably (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is in the range of 1.0-2.0, and more further preferably (La2O3+Gd2O3+Y2O3) / (ZnO+Ta2O5) is in the range of 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, 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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 meanwhile, the glass resistance to crystallization is reduced. 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.

[0058] In some embodiments, the ratio between the total content of B203, W03, 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.

[0059] 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.

[0060] 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 subranges 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.

[0061] 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, 10xLi2O / ZrO2is preferably 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 subranges 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, 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, or the like, 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] <Components not to be contained>

[0070] 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 specific wavelengths in the visible region, it is preferable that they are not actually contained.

[0071] 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.

[0072] 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.

[0073] 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 cases are also within the scope of protection of the present application.

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

[0075] <Refractive index and Abbe number>

[0076] 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".

[0077] In some embodiments, the lower limit of the refractive index (n d ) of the optical glass of the present application is 1.82, preferably 1.83, and more preferably 1.84. In some embodiments, the upper limit of the refractive index (n d ) of the optical glass of the present application is 1.875, preferably 1.87, and more preferably 1.86. In some embodiments, the refractive index (nd ) 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, etc., and all ranges and subranges between the above values.

[0078] In some embodiments, the Abbe number (ν d ) is 36, preferably 38, and more preferably 39. In some embodiments, the Abbe number (ν d ) has an upper limit of 44, preferably an upper limit of 42, and 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, etc., and all ranges and subranges between the above values.

[0079] <Coefficient of Thermal Expansion>

[0080] Thermal expansion coefficient of optical glass (α -30 / 70℃ ) The data at -30~70℃ was tested according to the method specified in the national standard "GB / T7962.16-2010".

[0081] In some embodiments, the thermal expansion coefficient (α -30 / 70℃ ) is 81×10 -7 / K or less, preferably 78×10 -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. In some embodiments, the thermal expansion coefficient (α -30 / 70℃ ) can be 81×10 -7 / K、80×10 -7 / K、79×10 -7 / K、78×10 -7 / K、77×10 -7 / K、76×10 -7 / K、75×10-7 / 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 the like, and all ranges and subranges between the above values.

[0082] <Water resistance stability>

[0083] 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).

[0084] In some embodiments, the water resistance stability (D W ) of the optical glass of the present application is Class 3 or more, preferably Class 2 or more, and more preferably Class 1.

[0085] <Weather resistance>

[0086] 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 at 40-50°C every 1 h 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:

[0087] Table 1.

[0088]

[0089] In some embodiments, the weather resistance (CR) of the optical glass of the present application is Class 2 or more, and preferably Class 1.

[0090] <Hardness>

[0091] The hardness (H K) according to the test method stipulated in the national standard GB / T 7962.18-2010. In the present application, the Knoop hardness can be simply referred to as hardness.

[0092] In some embodiments, the optical glass of the present application has a Knoop hardness (H K ) of 620 x 10 7 Pa or more, preferably 640 x 10 7 Pa or more, and more preferably 650 x 10 7 Pa or more. 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.

[0093] <Bubble degree>

[0094] The bubble degree of the optical glass is tested according to the method stipulated in the national standard GB / T 7962.8-2010.

[0095] In some embodiments, the optical glass of the present application has a bubble degree of Grade A or more, preferably Grade A0 or more, and more preferably Grade A 00 .

[0096] <Density>

[0097] The density (p) of the optical glass is tested according to the method stipulated in the national standard GB / T 7962.20-2010.

[0098] In some embodiments, the optical glass of the present application has a density (p) of 5.30 g / cm 3 or more, preferably 5.20 g / cm 3 or more, and more preferably 5.15 g / cm 3 or more. In some embodiments, the density (p) can be 5.30 g / cm 3 , 5.29 g / cm 3 , 5.28 g / cm 3 , etc., as well as all ranges and sub-ranges between the above-mentioned values., 5.27 g / cm 3 , 5.26 g / cm 3 , 5.25 g / cm 3 , 5.24 g / cm 3 , 5.23 g / cm 3 , 5.22 g / cm 3 , 5.21 g / cm 3 , 5.20 g / cm 3 , 5.19 g / cm 3 , 5.18 g / cm 3 , 5.17 g / cm 3 , 5.16 g / cm 3 , 5.15 g / cm 3 , 5.14 g / cm 3 , 5.13 g / cm 3 , 5.12 g / cm 3 , 5.11 g / cm 3 , 5.10 g / cm 3 , 5.09 g / cm 3 , 5.08 g / cm 3 , 5.07 g / cm 3 , 5.06 g / cm 3 , 5.05 g / cm 3 and all ranges and subranges therebetween.

[0099] <Young's modulus>

[0100] 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.

[0101]

[0102] G = V S 2 ρ

[0103] wherein E is Young's modulus, Pa;

[0104] G is shear modulus, Pa;

[0105] V T is the transverse wave velocity, m / s;

[0106] V S is the longitudinal wave velocity, m / s;

[0107] ρ is the density of the glass, g / cm 3

[0108] In some embodiments, the optical glass of the present application has a Young's modulus (E) of 10500 x 10​7 Pa, preferably 11000 x 10 7 Pa, more preferably 11500 x 10 7 Pa, further preferably the lower limit is 12000 x 10 7 Pa. 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 therebetween.

[0109] <degree of abrasion>

[0110] The degree of abrasion (F A ) of the optical glass refers to the value obtained by multiplying the ratio of the wear amount of the sample to the wear amount (volume) of the standard sample (H-K9 glass) by 100 under the same conditions, and is expressed by the following formula:

[0111] F A = V / V0 x 100 = (W / ρ) / (W0 / ρ0) x 100

[0112] In the formula, V is the volume wear amount of the sample to be measured;

[0113] V0 is the volume wear amount of the standard sample;

[0114] W is the mass wear amount of the sample to be measured;

[0115] W0— standard sample mass abrasion amount;

[0116] ρ— density of the sample to be measured;

[0117] ρ0— density of the standard sample.

[0118] In some embodiments, the lower limit of the abrasion degree (F A ) of the optical glass of the present application is 80, preferably 85, more preferably 90, and further preferably 95. In some embodiments, the upper limit of the abrasion degree (F A ) of the optical glass of the present application is 120, preferably 115, more preferably 110, and further preferably 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 all ranges and subranges between the above-mentioned values.

[0119] <Transition temperature>

[0120] 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.

[0121] In some embodiments, the transition temperature (T g ) of the optical glass of the present application is 620℃ or lower, preferably 610℃ or lower, and more preferably 600℃ or lower. In some embodiments, the transition temperature (T g ) can be 580℃, 583℃, 585℃, 587℃, 590℃, 593℃, 595℃, 597℃, 600℃, 603℃, 605℃, 607℃, 610℃, 613℃, 615℃, 617℃, 620℃, and all ranges and subranges between the above-mentioned values.

[0122] <Coloring degree>

[0123] The short-wave transmission spectral characteristics of the glass of the present application are represented by the coloring degrees (λ 70 and λ5). λ 70 is the wavelength corresponding to the transmittance of the glass reaching 70%. λ 70The measurement is performed using a glass having two opposite flat surfaces of 10 ± 0.1 mm in thickness, which are parallel to each other and optically polished, and the wavelength at which the transmittance is 70% is determined in the wavelength region from 280 nm to 700 nm. The transmittance or transmittance is an amount represented by I in / I out , which is a case where light of intensity I out is made to pass through the glass and exit from one flat surface as light of 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 less colored and the light transmittance is high.

[0124] λ5 is the same.

[0125] In some embodiments, the optical glass of the present application has λ 70 of 400 nm or less, preferably λ 70 of 390 nm or less, more preferably λ 70 of 380 nm or less. In some embodiments, the optical glass of the present application has λ 70 of 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, or the like, as well as all ranges and sub-ranges between the aforementioned values.

[0126] In some embodiments, the optical glass of the present application has a λ5of 360 nm or less, preferably a λ5of 350 nm or less, more preferably a λ5of 340 nm or less. In some embodiments, the optical glass can have a λ5of 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, etc., and all ranges and sub-ranges between the above values.

[0127] [Secondary press molding anti-crystallization performance]

[0128] The test method for 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 (800 °C for 15 minutes is used in the examples of the present application), 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.

[0129] In the secondary press molding anti-crystallization performance test, according to the foregoing test method, "A" is recorded for the glass surface having no devitrification or crystallization particles and the interior having no crystal particles, "B" is recorded for the glass interior having no crystallization particles but the surface layer having devitrification or crystallization particles (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), "C" is recorded for the glass interior having 1-10 crystal particles, "D" is recorded for the glass interior having 10-20 crystal particles, and "X" is recorded for the glass interior having 20 or more dense crystallization particles.

[0130] In some embodiments, the optical glass of the present application has a secondary press molding anti-crystallization performance of grade B or higher, preferably grade A.

[0131] [Method for manufacturing optical glass]

[0132] The optical glass of the present application is produced by a conventional method using conventional raw materials, including but not limited to oxides, hydroxides, complex salts (e.g., carbonates, nitrates, sulfates, etc.), boric acid, etc. The raw materials are mixed in a conventional manner, and the mixture is then melted in a melting furnace (e.g., a platinum or platinum alloy crucible) at a temperature of 1150 to 1450°C. The molten glass is then clarified and homogenized to remove bubbles and undissolved substances, and the resulting homogeneous molten glass is cast in a mold and annealed. The raw materials, the method, and the parameters can be appropriately selected by those skilled in the art according to the actual needs.

[0133] [Glass preform and optical element]

[0134] A glass preform can be produced from the optical glass by, for example, direct drop molding, or a molding method such as press molding, or hot press molding. That is, a glass preform can be produced by directly precision drop molding a molten optical glass into a glass precision preform, or by mechanical processing such as grinding and polishing, or by re-hot press molding a preform for press molding made of the optical glass, followed by grinding and polishing. Note that the method of producing a glass preform is not limited to the above methods.

[0135] As described above, the optical glass of the present application is useful for various optical elements and optical designs, and it is particularly preferable to form a preform from the optical glass of the present application, and to use the preform for re-hot press molding, precision press molding, etc., to produce optical elements such as lenses and prisms.

[0136] The glass preform and the optical element of the present application are each formed from the above-described optical glass of the present application. The glass preform of the present application has the excellent properties of the optical glass, and the optical element of the present application has the excellent properties of the optical glass, and can provide various optical elements such as lenses and prisms having high optical value.

[0137] As examples of lenses, there are various lenses such as concave meniscus lenses, convex meniscus lenses, lenticular lenses, double concave lenses, plano-convex lenses, and plano-concave lenses, in which the lens surface is a spherical surface or a non-spherical surface.

[0138] [Optical instrument]

[0139] The optical element formed from the optical glass of the present application can be used to produce optical instruments such as photographic equipment, video recording equipment, projection equipment, display equipment, vehicle-mounted equipment, and monitoring equipment.

[0140] Examples

[0141] [Optical glass examples]

[0142] In order to further clarify and illustrate the technical solutions of the present application, the following non-limiting examples are provided.

[0143] The optical glasses having the compositions shown in Tables 2 to 4 were obtained by the above-described method for producing optical glasses. In addition, the properties of each glass were measured by the test methods described in the present application, and the measurement results are shown in Tables 2 to 4.

[0144] Table 2

[0145]

[0146]

[0147] Table 3

[0148]

[0149]

[0150] Table 4

[0151]

[0152]

[0153]

[0154] <Example of Glass Preform>

[0155] The glasses obtained in Examples 1 to 18 of optical glass were used to produce various preforms such as concave meniscus lenses, convex meniscus lenses, double convex lenses, double concave lenses, plano-convex lenses, plano-concave lenses, prisms, and the like, using a means such as grinding processing, or a means such as reheat press molding, precision press molding, and the like.

[0156] <Example of Optical Element>

[0157] The preforms obtained in the above-described example of glass preform were annealed to reduce the internal stress of the glass while finely adjusting the refractive index, so that the optical properties such as the refractive index reached the desired values.

[0158] Next, each preform was ground and polished to produce various lenses such as concave meniscus lenses, convex meniscus lenses, double convex lenses, double concave lenses, plano-convex lenses, plano-concave lenses, prisms, and the like. An antireflection film can also be applied to the surface of the obtained optical element.

[0159] <Example of Optical Instrument>

[0160] 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. 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%; Nb2O5: greater than 0% but less than or equal to 8%; WO3: 0.1-8%; ZrO2: 0.5-10%; Li2O: greater than 0% but less than or equal to 7%, wherein WO3 / Li2O is 2.0-8.0, and 10×Li2O / ZrO2 is 1.3-10.

0.

2. The optical glass according to claim 1, wherein Its components, expressed in weight percentage, further contain: 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 the RO is one or more of MgO, CaO, SrO, and BaO, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

3. Optical glass, characterized in that Its components include SiO2, B2O3, La2O3, ZnO, Ta2O5, Nb2O5, WO3, ZrO2 and Li2O, and its components are expressed in weight percentage, wherein WO3 / Li2O is 2.0-8.0, 10×Li2O / ZrO2 is 1.3-10.0, and the refractive index of the optical glass is n d is 1.82~1.875, Abbe number v d The thermal expansion coefficient is 36 to 44, -30 / 70℃ 81×10 -7 / K or less, Knoop hardness H K 620×10 7 Pa and above.

4. The optical glass according to claim 3, wherein 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 optical glass according to any one of claims 1 to 4, characterized in that: Its components, expressed in weight percentage, meet one or more of the following 13 conditions: 1) WO3 / Li2O is 2.5 to 6.5, preferably WO3 / Li2O is 2.8 to 5.5, and more preferably WO3 / Li2O is 3.0 to 4.5; 2) 10×Li2O / ZrO2 is 1.5 to 8.0, preferably 10×Li2O / ZrO2 is 1.8 to 6.0, and more preferably 10×Li2O / ZrO2 is 2.0 to 4.0; 3) ZnO / Ta2O5 is 0.6 to 1.8, preferably ZnO / Ta2O5 is 0.7 to 1.5, more preferably ZnO / Ta2O5 is 0.8 to 1.3, and further preferably ZnO / Ta2O5 is 0.9 to 1.1; 4) 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; 5) 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; 6) 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; 7) (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; 8) (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; 9) 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; 10) (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; 11) (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; 12) (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; 13) (Nb2O5+WO3) / SiO2 is 0.1~1.8, preferably (Nb2O5+WO3) / SiO2 is 0.1~1.6, more preferably (Nb2O5+WO3) / SiO2 is 0.2~1.4, and further preferably (Nb2O5+WO3) / SiO2 is 0.5~1.

2.

6. The 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.

7. The 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%.

8. The 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.

9. The optical glass according to any one of claims 1 to 4, characterized in that: The refractive index n of the optical glass d 1.82 to 1.875, preferably 1.83 to 1.87, more preferably 1.84 to 1.86; and / or Abbe number v d 36 to 44, preferably 38 to 42, more preferably 39 to 41; and / or thermal expansion coefficient α -30 / 70℃ 81×10 -7 / K or less, preferably 78×10 -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.

10. A glass preform, characterized in that Made of the optical glass according to any one of claims 1 to 9.

11. An optical element, characterized in that The optical glass is made of any one of claims 1 to 9, or the glass preform is made of claim 10.

12. An optical instrument, characterized in that Contains the optical glass according to any one of claims 1 to 9, and / or contains the optical element according to claim 11.

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