Glass materials, glass components, and optical instruments

Abstract

This invention provides a glass material whose composition, expressed as a weight percentage, contains: SiO2: 17-32%; B2O3: 18-32%; La2O3: 7.5-23%; BaO: 12-27.5%; SrO: 2-15%. Through reasonable composition design, the glass material obtained by this invention exhibits high light transmittance. This invention also provides a glass element and an optical instrument.

Description

[Technical Field]

[0001] This invention relates to a glass material, and more particularly to a glass material with high light transmittance. [Previous Technology]

[0002] In recent years, the continuous integration of optics with electronic information science, life science, and new materials science has led to rapid advancements in the application of glass materials, as a fundamental material for optoelectronics, in fields such as optical transmission, optical storage, and optoelectronic displays. The rapid development of optical instruments and equipment in terms of digitization, integration, and high precision has placed higher demands on the performance of glass materials used in optical instruments and equipment.

[0003] With the rapid development of technologies such as large field-of-view high-resolution endoscope systems and large numerical aperture low-absorption optical fibers, optical fiber core glass requires a higher refractive index to achieve a larger numerical aperture, while also needing high transmittance to achieve low light absorption under 3-5 meter optical path conditions. Existing technologies mainly achieve these properties by adding a high content of PbO to the glass material. However, with the increasing demands of environmental policies and growing health awareness, lead-containing glass cannot meet environmental protection requirements. Patent document CN101389575A discloses a glass with a refractive index of 1.55-1.69 and an Abbe number of 55-65. Although it does not contain PbO, it contains 46-70 wt% B2O3. Excessive B2O3 increases the difficulty of glass forming and easily produces streaks. Patent document CN1215032A discloses a glass with a refractive index of 1.55-1.63 and an Abbe number of 55-63, which contains 45-50wt% SiO2. Excessive SiO2 will increase the melting temperature and high-temperature viscosity of the glass, which is not conducive to improving the light transmittance of the glass. [Summary of the Invention]

[0004] Based on the above reasons, the technical problem to be solved by the present invention is to provide a glass material with high light transmittance.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a glass material, the composition of which is expressed in weight percentage, containing: SiO2: 17-32%; B2O3: 18-32%; La2O3: 7.5-23%; BaO: 12-27.5%; SrO: 2-15%.

[0006] Further, the glass material, whose composition is expressed as a weight percentage, also contains: Al2O3: 0-10%; and / or ZrO2: 0-10%; and / or Gd2O3: 0-8%; and / or Y2O3: 0-8%; and / or Yb2O3: 0-5%; and / or Nb2O5: 0-5%; and / or WO3: 0-5%; and / or ZnO: 0-4.5%; and / or Rn2O: 0- 6.5%; and / or MgO: 0-5%; and / or CaO: 0-4%; and / or TiO2: 0-5%; and / or Ta2O5: 0-5%; and / or P2O5: 0-4%; and / or F: 0-5%; and / or clarifying agent: 0-1%, wherein the Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

[0007] Glass material, the composition of which is expressed as a weight percentage, is as follows: SiO2: 17-32%; B2O3: 18-32%; La2O3: 7.5-23%; BaO: 12-27.5%; SrO: 2-15%; Al2O3: 0-10%; ZrO2: 0-10%; Gd2O3: 0-8%; Y2O3: 0-8%; Yb2O3: 0-5%; Nb2O5: 0-5%; WO3: Composition: 0-5%; ZnO: 0-4.5%; Rn2O: 0-6.5%; MgO: 0-5%; CaO: 0-4%; TiO2: 0-5%; Ta2O5: 0-5%; P2O5: 0-4%; F: 0-5%; clarifying agent: 0-1%, wherein Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

[0008] Further, the glass material is composed of components expressed as a weight percentage, wherein: Ln2O3: 7.5-28%, preferably Ln2O3: 10-25%, more preferably Ln2O3: 11-20%, and the Ln2O3 is the total content of La2O3, Gd2O3, Y2O3 and Yb2O3.

[0009] Further, the glass material is expressed in weight percentage, wherein: B2O3 / SiO2 is 0.7-1.7, preferably B2O3 / SiO2 is 0.75-1.5, more preferably B2O3 / SiO2 is 0.8-1.3, and even more preferably B2O3 / SiO2 is 0.85-1.1.

[0010] Further, the glass material is expressed in weight percentage, wherein: (La2O3+SrO) / BaO is 0.5-2.5, preferably (La2O3+SrO) / BaO is 0.7-2.0, more preferably (La2O3+SrO) / BaO is 0.8-1.8, and even more preferably (La2O3+SrO) / BaO is 0.9-1.5.

[0011] Further, the glass material is expressed in weight percentage, wherein: SrO / La2O3 is 0.1-1.5, preferably SrO / La2O3 is 0.2-1.2, more preferably SrO / La2O3 is 0.3-1.0, and even more preferably SrO / La2O3 is 0.35-0.8.

[0012] Further, the glass material has the following composition expressed in weight percentage: La2O3 / SiO2 is 0.3-1.2, preferably La2O3 / SiO2 is 0.35-1.0, more preferably La2O3 / SiO2 is 0.4-0.9, and even more preferably La2O3 / SiO2 is 0.45-0.8.

[0013] Further, the glass material, the composition of which is expressed as a weight percentage, wherein: (BaO+SrO) / (ZrO2+Al2O3) is 1.0-15.0, preferably (BaO+SrO) / (ZrO2+Al2O3) is 1.5-10.0, more preferably (BaO+SrO) / (ZrO2+Al2O3) is 2.0-8.0, and even more preferably (BaO+SrO) / (ZrO2+Al2O3) is 2.5-5.0.

[0014] Further, the glass material is expressed in weight percentage, wherein: Al2O3 / B2O3 is 0.01-0.45, preferably Al2O3 / B2O3 is 0.05-0.4, and more preferably Al2O3 / B2O3 is 0.1-0.3.

[0015] Further, the glass material is expressed in weight percentage, wherein: ZrO2 / SiO2 is 0.01-0.4, preferably ZrO2 / SiO2 is 0.05-0.35, and more preferably ZrO2 / SiO2 is 0.1-0.3.

[0016] Further, the glass material is expressed in weight percentage, wherein: Al2O3 / ZrO2 is 0.2-8.0, preferably Al2O3 / ZrO2 is 0.5-6.0, more preferably Al2O3 / ZrO2 is 0.8-4.0, and even more preferably Al2O3 / ZrO2 is 1.0-2.0.

[0017] Further, the glass material, the composition of which is expressed as a weight percentage, wherein: (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO is 1.0 or less, preferably (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO is 0.8 or less, more preferably (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO is 0.5 or less, and even more preferably (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO is 0.3 or less, wherein Rn2O is one or more of Li2O, Na2O, and K2O.

[0018] Further, the glass material, the composition of which is expressed as a weight percentage, wherein: (ZnO+CaO+Rn2O) / La2O3 is 1.0 or less, preferably (ZnO+CaO+Rn2O) / La2O3 is 0.8 or less, more preferably (ZnO+CaO+Rn2O) / La2O3 is 0.5 or less, and even more preferably (ZnO+CaO+Rn2O) / La2O3 is 0.3 or less, wherein Rn2O is one or more of Li2O, Na2O, and K2O.

[0019] Further, the glass material, the composition of which is expressed in weight percentage, wherein: SiO2: 21-30%, preferably SiO2: 22-28%; and / or B2O3: 21-30%, preferably B2O3: 22-29%; and / or La2O3: 11-20%, preferably La2O3: 12-18%; and / or BaO: 15-25%, preferably BaO: 16-23%; and / or SrO: 3-13%, preferably SrO: 5.5-11%; and / or Al2O3: 1-8%, preferably Al ZrO2: 2-7%; and / or ZrO2: 0.5-8%, preferably ZrO2: 1-7%; and / or Gd2O3: 0-5%, preferably Gd2O3: 0-1.5%, more preferably Gd2O3-free; and / or Y2O3: 0-5%, preferably Y2O3: 0-1.5%, more preferably Y2O3-free; and / or Yb2O3: 0-3%, preferably Yb2O3: 0-2%, more preferably Yb2O3-free; and / or Nb2O5: 0-3%, preferably Nb2O5: 0-1%, more preferably Nb2O5-free. ; and / or WO3: 0-3%, preferably WO3: 0-1%, more preferably WO3-free; and / or ZnO: 0-3%, preferably ZnO: 0-2%, more preferably ZnO-free; and / or Rn2O: 0-5%, preferably Rn2O: 0-2%; and / or MgO: 0-3%, preferably MgO: 0-2%, more preferably MgO-free; and / or CaO: 0-3%, preferably CaO: 0-2%, more preferably CaO-free; and / or TiO2: 0-3%, preferably TiO2: 0-2%, more preferably TiO-free. 2; and / or Ta2O5: 0-3%, preferably Ta2O5: 0-1%, more preferably not containing Ta2O5; and / or P2O5: 0-2%, preferably P2O5: 0-1%, more preferably not containing P2O5; and / or F: 0-3%, preferably F: 0-2%, more preferably not containing F; and / or clarifying agent: 0-0.5%, preferably clarifying agent: 0-0.2%, wherein the Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

[0020] Further, the glass material, the composition of which is expressed in weight percentage, wherein: Li2O: 0-5%, preferably Li2O: 0-3%, more preferably Li2O: 0-2%; and / or Na2O: 0-5%, preferably Na2O: 0-3%, more preferably Na2O: 0-2%, and more preferably does not contain Na2O; and / or K2O: 0-5%, preferably K2O: 0-3%, more preferably K2O: 0-2%, and more preferably does not contain K2O.

[0021] Further, for glass materials with a thickness of 12 mm or less, the average light transmittance τ400-800nm ​​at 400-800nm ​​is 99.0% or more, preferably 99.5% or more, and more preferably 99.7% or more; and / or for glass materials with a thickness of 12 mm or less, the light transmittance τ400nm at 400nm is 99.0% or more, preferably 99.5% or more, and more preferably 99.7% or more.

[0022] Further, the thickness of the glass material is 1-12mm, preferably 2-12mm, more preferably 5-10mm, and even more preferably 2mm, 5mm, 8mm or 10mm.

[0023] Further, the refractive index nd of the glass material is 1.59-1.66, preferably 1.60-1.65, more preferably 1.61-1.64; and / or the Abbe number νd is 55-61, preferably 56-60, more preferably 57-59; and / or the transition temperature Tg is below 650℃, preferably 600-650℃, more preferably 605-645℃, even more preferably 610-640℃; and / or the water resistance stability DW is Class 3 or above, preferably Class 2 or above, more preferably Class 1; and / or the density ρ is 3.6. The Knoop hardness (HK) is 500 × 10⁷ Pa or more, preferably 515 × 10⁷ Pa or more, more preferably 530 × 10⁷ Pa or more; and / or the Young's modulus (E) is 7000 × 10⁷ Pa or more, preferably 7300 × 10⁷ Pa or more, more preferably 7600 × 10⁷ Pa or more; and / or the abrasion resistance (FA) is 200 or less, preferably 175 or less, more preferably 150 or less; and / or the coefficient of thermal expansion (α) is 20 / 300. The viscosity at 1200°C is 90×10⁻⁷ / K or less, preferably 50×10⁻⁷ / K-85×10⁻⁷ / K, more preferably 55×10⁻⁷ / K-80×10⁻⁷ / K, and even more preferably 60×10⁻⁷ / K-72×10⁻⁷ / K; and / or the high-temperature viscosity at 1200°C is 60 dPaS or less, preferably 40 dPaS or less, more preferably 30 dPaS or less; and / or the anti-crystallization performance is Grade B or above, preferably Grade A.

[0024] The glass preform is made of the glass material described above.

[0025] The glass element is made of the glass material described above or the glass preform described above.

[0026] An optical instrument containing the glass material described above, or containing the glass element described above.

[0027] The beneficial effect of the present invention is that, through reasonable component design, the glass material obtained by the present invention has high light transmittance.

Implementation Method

[0029] Hereinafter, embodiments of the glass material of the present invention will be described in detail. However, the present invention is not limited to the embodiments described below, and appropriate modifications can be made to implement it within the scope of the purpose of the present invention. Furthermore, regarding repeated descriptions, although there are appropriate omissions, this will not limit the spirit of the invention. In the following text, the glass material of the present invention will sometimes be simply referred to as glass.

[0030] [Glass Material]

[0031] The component ranges of the glass material of the present invention will be described below. In this specification, unless otherwise specified, the content of each component, the total content, and the total content are all expressed as a weight percentage relative to the total amount of glass material converted into oxides. Here, "converted into oxides" means that when the oxides, complex salts, and hydroxides used as raw materials that are components of the glass material of the present invention decompose and transform into oxides upon melting, the total amount of such oxides is taken as 100%.

[0032] Unless otherwise specified in the specific context, the numerical ranges listed herein include upper and lower limits, and "above" and "below" include endpoint values ​​and all integers and fractions included in the range, but are not limited to the specific values ​​listed when the range is defined. The term "and / or" as used herein is inclusive, for example, "A and / or B" means only A, or only B, or both A and B.

[0033] <Essential and Optional Components>

[0034] SiO2 is the framework of glass materials. As a glass network generator, it plays a role in maintaining the chemical stability of glass and improving its devitrification resistance. If the SiO2 content is less than 17%, the above effects are not obvious. Therefore, the lower limit of SiO2 content is 17%, preferably 21%, and more preferably 22%. If the SiO2 content is higher than 32%, the meltability of the glass decreases, the transition temperature and high-temperature viscosity increase, which is not conducive to improving the light transmittance of the glass. Therefore, the upper limit of SiO2 content is 32%, preferably 30%, and more preferably 28%.

[0035] B2O3 is a component that forms a glass network structure and is an essential component of the glass of the present invention. By containing more than 18% B2O3, the meltability, devitrification resistance, and light transmittance of the glass can be improved. If the B2O3 content exceeds 32%, the chemical stability of the glass deteriorates, glass volatilization increases, which is not conducive to the stable control of optical constants, and the streaking is easily deteriorated. Therefore, the B2O3 content is 18-32%, preferably 21-30%, and more preferably 22-29%.

[0036] In some embodiments, controlling the ratio of B2O3 content to SiO2 content, B2O3 / SiO2, within the range of 0.7-1.7 can reduce the high-temperature viscosity of the glass while preventing a decrease in Young's modulus. Therefore, a B2O3 / SiO2 ratio of 0.7-1.7 is preferred, and a B2O3 / SiO2 ratio of 0.75-1.5 is more preferred. Furthermore, controlling the B2O3 / SiO2 ratio within the range of 0.8-1.3 can further optimize the transmittance and coefficient of thermal expansion of the glass. Therefore, a B2O3 / SiO2 ratio of 0.8-1.3 is further preferred, and a B2O3 / SiO2 ratio of 0.85-1.1 is even more preferred.

[0037] La2O3 is an essential component of the glass of the present invention. It can improve the refractive index, chemical stability, and mechanical strength of the glass, and reduce the relative partial dispersion of the glass. In the present invention, the above effects are achieved by containing 7.5% or more La2O3, preferably 11% or more La2O3, and more preferably 12% or more La2O3. If the content of La2O3 exceeds 23%, the anti-crystallization and thermal stability of the glass tend to deteriorate. Therefore, in the present invention, the content of La2O3 is 23% or less, preferably 20% or less, and more preferably 18% or less.

[0038] In some embodiments, controlling the ratio of La2O3 content to SiO2 content, La2O3 / SiO2, within the range of 0.3-1.2, allows the glass to exhibit excellent abrasion resistance while preventing an increase in transition temperature. Therefore, a La2O3 / SiO2 ratio of 0.3-1.2 is preferred, and a La2O3 / SiO2 ratio of 0.35-1.0 is more preferred. Furthermore, controlling the La2O3 / SiO2 ratio within the range of 0.4-0.9 can further optimize the light transmittance of the glass. Therefore, a La2O3 / SiO2 ratio of 0.4-0.9 is further preferred, and a La2O3 / SiO2 ratio of 0.45-0.8 is even more preferred.

[0039] Gd2O3 can improve the refractive index and chemical stability of glass, but if its content is higher than 8%, the glass's resistance to devitrification and abrasion resistance will deteriorate. Therefore, the content of Gd2O3 is 0-8%, preferably 0-5%, and more preferably 0-1.5%. In some embodiments, it is further preferred that the glass does not contain Gd2O3.

[0040] Y2O3 can increase the refractive index of glass, reduce its density and crystallization upper limit temperature, but if its content is higher than 8%, the glass's resistance to devitrification and weathering deteriorates. Therefore, in this invention, the Y2O3 content is 0-8%, preferably 0-5%, and more preferably 0-1.5%. In some embodiments, it is further preferred that the glass does not contain Y2O3.

[0041] Yb2O3 is also a component that imparts high refractive index and low dispersion properties to glass. If its content exceeds 5%, the glass's resistance to crystallization deteriorates. Therefore, the content of Yb2O3 is 0-5%, preferably 0-3%, and more preferably 0-2%. In some embodiments, it is even more preferable that Yb2O3 is not present.

[0042] In some embodiments, controlling the total content of La2O3, Gd2O3, Y2O3, and Yb2O3 (Ln2O3) within the range of 7.5-28% can more easily achieve the desired refractive index and improve chemical stability while preventing a deterioration in the glass's resistance to crystallization. Therefore, it is preferable that the content of Ln2O3 is 7.5-28%, more preferably 10-25%, and even more preferably 11-20%.

[0043] ZrO2 can adjust the optical constant of glass, improve its resistance to devitrification and chemical stability. If its content exceeds 10%, the glass melting performance decreases, the melting temperature increases, and it is easy to cause inclusions inside the glass and a decrease in its transmittance, and it is difficult to maintain a low transition temperature. Therefore, the ZrO2 content is 0-10%, preferably 0.5-8%, and more preferably 1-7%.

[0044] In some embodiments, controlling the ratio of ZrO2 content to SiO2 content (ZrO2 / SiO2) within the range of 0.01-0.4 can improve the hardness and chemical stability of the glass and prevent a deterioration in its anti-crystallization properties. Therefore, a ZrO2 / SiO2 ratio of 0.01-0.4 is preferred, a ZrO2 / SiO2 ratio of 0.05-0.35 is more preferred, and a ZrO2 / SiO2 ratio of 0.1-0.3 is even more preferred.

[0045] Nb2O5 improves the refractive index and dispersion of glass, and also enhances its resistance to crystallization and chemical stability. If its content exceeds 5%, the glass dispersion increases, failing to achieve the optical properties of the glass of this invention, while the light transmittance of the glass decreases. Therefore, the Nb2O5 content is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that the glass does not contain Nb2O5.

[0046] WO3 can improve the refractive index and dispersion of glass. If its content is too high, the light transmittance of the glass will decrease and the anti-crystallization performance will deteriorate. Therefore, the content of WO3 is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is even more preferable that the glass does not contain WO3.

[0047] ZnO can lower the glass transition temperature, improve the chemical stability of the glass, and reduce the high-temperature viscosity of the glass. If the ZnO content is too high, the anti-crystallization performance of the glass will deteriorate and the coefficient of thermal expansion will increase. Therefore, the ZnO content in this invention is 0-4.5%, preferably 0-3%, and more preferably 0-2%. In some embodiments, it is further preferred that the glass does not contain ZnO.

[0048] Alkali metal oxides Rn2O (Rn2O is one or more of Li2O, Na2O, and K2O) can lower the glass transition temperature, adjust the optical constant and high-temperature viscosity of the glass, and improve the meltability of the glass. However, when its content is high, the glass's resistance to devitrification and chemical stability decrease. Therefore, in this invention, the content of Rn2O is 0-6.5%, preferably 0-5%, and more preferably 0-2%.

[0049] Li₂O can lower the glass transition temperature, but its high content is detrimental to the glass's acid resistance and coefficient of thermal expansion, and it also corrodes the melting vessel (such as a platinum crucible). Therefore, the content of Li₂O is 0-5%, preferably 0-3%, and more preferably 0-2%.

[0050] Na2O improves the melting properties of glass and lowers the glass transition temperature. However, when its content is too high, the chemical stability and weather resistance of the glass decrease. Therefore, the content of Na2O is 0-5%, preferably 0-3%, and more preferably 0-2%. In some embodiments, it is further preferred that Na2O is not present.

[0051] K2O has the effect of improving the thermal stability and meltability of glass, but when the K2O content exceeds 5%, the devitrification resistance of the glass decreases. Therefore, the K2O content is 0-5%, preferably 0-3%, and more preferably 0-2%. In some embodiments, it is even more preferable that the glass does not contain K2O.

[0052] MgO can reduce the melting temperature and relative partial dispersion of glass, but when the MgO content is too high, the anti-crystallization properties and stability of the glass decrease. Therefore, the MgO content is 0-5%, preferably 0-3%, and more preferably 0-2%. In some embodiments, it is further preferred that the glass does not contain MgO.

[0053] CaO helps improve the density and processing performance of glass, but if the CaO content is too high, it will make it difficult for the optical constants of the glass to meet the design requirements and deteriorate the anti-crystallization performance. Therefore, the CaO content is 0-4%, preferably 0-3%, and more preferably 0-2%. In some embodiments, it is even more preferable that the glass does not contain CaO.

[0054] In some embodiments, controlling the ratio (ZnO+CaO+Rn2O) / La2O3 between the total content of ZnO, CaO, and Rn2O (ZnO+CaO+Rn2O) and the content of La2O3 (ZnO+CaO+Rn2O) / La2O3 to below 1.0 can improve the chemical stability and light transmittance of the glass and prevent the density and wear resistance from deteriorating. Therefore, it is preferable that (ZnO+CaO+Rn2O) / La2O3 is below 1.0, more preferably (ZnO+CaO+Rn2O) / La2O3 is below 0.8, further preferably (ZnO+CaO+Rn2O) / La2O3 is below 0.5, and even more preferably (ZnO+CaO+Rn2O) / La2O3 is below 0.3.

[0055] SrO can improve the devitrification resistance and melting performance of glass, but if its content is too high, it will be difficult for the refractive index of the glass to meet the design requirements, and the cost of the glass will also rise rapidly. Therefore, the content of SrO is 2-15%, preferably 3-13%, and more preferably 5.5-11%.

[0056] In some embodiments, controlling the ratio of SrO content to La2O3 content (SrO / La2O3) within the range of 0.1-1.5 can improve the chemical stability and Young's modulus of the glass and prevent an increase in the coefficient of thermal expansion of the glass. Therefore, it is preferable that the SrO / La2O3 ratio is 0.1-1.5, more preferably 0.2-1.2, even more preferably 0.3-1.0, and even more preferably 0.35-0.8.

[0057] In some embodiments, by controlling the ratio between the total content of Y2O3, Gd2O3, ZnO, CaO, and Rn2O (Y2O3+Gd2O3+ZnO+CaO+Rn2O) and the content of SrO (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO below 1.0, it is possible to reduce the high-temperature viscosity and transition temperature of the glass while preventing a decrease in hardness. Therefore, it is preferable that (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO is 1.0 or less, more preferably (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO is 0.8 or less, even more preferably (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO is 0.5 or less, and even more preferably (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO is 0.3 or less.

[0058] In this invention, BaO plays a role in adjusting the refractive index of glass, improving glass transmittance and devitrification resistance, and can also reduce the temperature coefficient of refractive index and the coefficient of thermal expansion of glass. If its content is too high, the chemical stability of the glass will decrease. Therefore, the content of BaO is 12-27.5%, preferably 15-25%, and more preferably 16-23%.

[0059] In some embodiments, the ratio of the total content of La2O3 and SrO (La2O3+SrO) to the content of BaO (La2O3+SrO) / BaO is controlled within the range of 0.5-2.5. This can reduce the coefficient of thermal expansion and transition temperature of the glass while preventing a decrease in the Young's modulus of the glass. Therefore, it is preferable that (La2O3+SrO) / BaO is 0.5-2.5, more preferably (La2O3+SrO) / BaO is 0.7-2.0, further preferably (La2O3+SrO) / BaO is 0.8-1.8, and even more preferably (La2O3+SrO) / BaO is 0.9-1.5.

[0060] TiO2 has the function of increasing the refractive index of glass and can participate in the formation of glass network. An appropriate amount can make the glass more stable, but too much content will lead to a decrease in the light transmittance of the glass and obvious glass coloring. Therefore, the TiO2 content of the present invention is 0-5%, preferably 0-3%, and more preferably 0-2%. In some embodiments, it is further preferred that TiO2 is not contained.

[0061] Al2O3 can improve the stability and devitrification resistance of glass, and increase its strength. However, when its content exceeds 10%, the chemical stability and meltability of the glass decrease. Therefore, the content of Al2O3 in this invention is 0-10%, preferably 1-8%, and more preferably 2-7%.

[0062] In some embodiments, controlling the ratio of Al2O3 content to ZrO2 content (Al2O3 / ZrO2) within the range of 0.2-8.0 can reduce the high-temperature viscosity of the glass while preventing a deterioration in the glass's anti-crystallization properties. Therefore, an Al2O3 / ZrO2 ratio of 0.2-8.0 is preferred, and an Al2O3 / ZrO2 ratio of 0.5-6.0 is more preferred. Furthermore, keeping the Al2O3 / ZrO2 ratio within the range of 0.8-4.0 can further optimize the hardness and abrasion resistance of the glass. Therefore, an Al2O3 / ZrO2 ratio of 0.8-4.0 is further preferred, and an Al2O3 / ZrO2 ratio of 1.0-2.0 is even more preferred.

[0063] In some embodiments, controlling the ratio of Al2O3 content to B2O3 content (Al2O3 / B2O3) within the range of 0.01-0.45 can reduce the coefficient of thermal expansion of the glass, prevent the glass transition temperature from rising, and improve the light transmittance of the glass. Therefore, it is preferable that Al2O3 / B2O3 is 0.01-0.45, more preferably 0.05-0.4, and even more preferably 0.1-0.3.

[0064] In some embodiments, controlling the ratio (BaO+SrO) / (ZrO2+Al2O3) between the total content of BaO and SrO (BaO+SrO) and the total content of ZrO2 and Al2O3 (ZrO2+Al2O3) within the range of 1.0-15.0 can optimize the abrasion resistance of the glass while reducing its density. Therefore, it is preferable that (BaO+SrO) / (ZrO2+Al2O3) is 1.0-15.0, and more preferably (BaO+SrO) / (ZrO2+Al2O3) is 1.5-10.0. Furthermore, controlling (BaO+SrO) / (ZrO2+Al2O3) within the range of 2.0-8.0 can further optimize the high-temperature viscosity of the glass. Therefore, the preferred ratio of (BaO+SrO) / (ZrO2+Al2O3) is 2.0-8.0, and the preferred ratio of (BaO+SrO) / (ZrO2+Al2O3) is 2.5-5.0.

[0065] Ta2O5 can improve the refractive index and devitrification resistance of glass, but if its content is too high, the thermal stability of the glass will decrease and the density will increase. On the other hand, compared with other components, Ta2O5 is very expensive. From the perspective of practicality and cost, its usage should be minimized. Therefore, the content of Ta2O5 in this invention is limited to 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that Ta2O5 is not present.

[0066] P2O5 can improve the devitrification resistance of glass, but if its content is too high, the chemical stability of the glass will deteriorate. Therefore, the content of P2O5 is 0-4%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is even more preferable that P2O5 is not present.

[0067] In this invention, one or more components containing 0-1% of Sb2O3, SnO2, SnO, CeO2 are used as clarifiers to improve the clarification effect of glass and increase the bubble content of glass. Preferably, the content of the clarifier is 0-0.5%, and more preferably, the content of the clarifier is 0-0.2%.

[0068] F can be used to adjust the refractive index of glass and reduce the temperature coefficient of refractive index. However, its volatilization during the production process causes environmental pollution. Furthermore, in the forming temperature range, its volatilization from the glass surface can create heterogeneous components, reducing glass quality and the consistency of optical constants. Therefore, the content of F is 0-5%, preferably 0-3%, and more preferably 0-2%. In some embodiments, it is further preferred that F is not present.

[0069] <Components that should not be present>

[0070] In the glass of the present invention, even if oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo are contained in small amounts, either alone or in combination, the glass will be colored and absorb at specific wavelengths in the visible light region, thereby weakening the property of the present invention to improve visible light transmittance. Therefore, it is preferable that the glass material, especially for glass materials that require transmittance in the visible light region, does not contain these oxides.

[0071] Oxides of Th, Cd, Tl, Os, Be, and Se have been increasingly subject to controlled use in recent years due to their status as hazardous chemicals. Environmental protection measures are essential not only in the glass manufacturing process but also in the processing and disposal of finished products. Therefore, given the importance of environmental impact, it is preferable to avoid the presence of these substances, except where their contamination is unavoidable. As a result, the glass material becomes virtually free of pollutants. Therefore, the glass material of the present invention can be manufactured, processed, and disposed of even without special environmental countermeasures.

[0072] To achieve environmental friendliness, the glass material of the present invention preferably does not contain As2O3 and PbO. Although As2O3 has the effect of eliminating bubbles and preventing glass discoloration, the addition of As2O3 will increase the corrosion of platinum in the furnace, especially in platinum furnaces, resulting in more platinum ions entering the glass and adversely affecting the service life of the platinum furnace.

[0073] The terms “not containing” and “0%” used herein mean that the compound, molecule or element was not intentionally added to the glass material of the present invention as a raw material; however, as raw materials and / or equipment for producing glass materials, there may be some impurities or components that are not intentionally added, which may be present in small or trace amounts in the final glass material, and such situations are also within the scope of protection of this patent.

[0074] The properties of the glass material of the present invention will be described below.

[0075] <Refractive Index and Abbe Number>

[0076] The refractive index (nd) and Abbe number (νd) of the glass material shall be tested in accordance with the method specified in GB / T 7962.1—2010.

[0077] In some embodiments, the upper limit of the refractive index (nd) of the glass material of the present invention is 1.66, preferably 1.65, and more preferably 1.64.

[0078] In some embodiments, the lower limit of the refractive index (nd) of the glass material of the present invention is 1.59, preferably 1.60, and more preferably 1.61.

[0079] In some embodiments, the upper limit of the Abbe number (νd) of the glass material of the present invention is 61, preferably 60, and more preferably 59.

[0080] In some embodiments, the lower limit of the Abbe number (νd) of the glass material of the present invention is 55, preferably 56, and more preferably 57.

[0081] <Transition Temperature>

[0082] The transition temperature (Tg) of the glass material shall be tested in accordance with the method specified in GB / T7962.16—2010.

[0083] In some embodiments, the transition temperature (Tg) of the glass material of the present invention is below 650°C, preferably 600-650°C, more preferably 605-645°C, and even more preferably 610-640°C.

[0084] <Stability under water resistance>

[0085] The water resistance stability (DW) of glass materials (powder method) shall be tested in accordance with the method specified in GB / T 17129.

[0086] In some embodiments, the water resistance stability (DW) of the glass material of the present invention is Class 3 or above, preferably Class 2 or above, and more preferably Class 1.

[0087] <Density>

[0088] The density (ρ) of the glass material shall be tested in accordance with the method specified in GB / T7962.20—2010.

[0089] In some embodiments, the density (ρ) of the glass material of the present invention is 3.60 g / cm3 or less, preferably 3.50 g / cm3 or less, and more preferably 3.40 g / cm3 or less.

[0090] <Knoop Hardness>

[0091] The Knoop hardness (HK) of glass materials shall be tested in accordance with the method specified in GB / T7962.18—2010.

[0092] In some embodiments, the Knoop hardness (HK) of the glass material of the present invention is 500×107 Pa or more, preferably 515×107 Pa or more, and more preferably 530×107 Pa or more.

[0093] Young's Modulus>

[0094] The Young's modulus (E) of the glass material is obtained by ultrasonic testing of its longitudinal wave velocity and transverse wave velocity, and then calculated according to the following formula: G=VS 2ρ Where: E is Young's modulus, Pa; G is shear modulus, Pa; VT is transverse wave velocity, m / s; VS is longitudinal wave velocity, m / s; ρ is glass density, g / cm3.

[0095] In some embodiments, the Young's modulus (E) of the glass material of the present invention is 7000×107 Pa or more, preferably 7300×107 Pa or more, and more preferably 7600×107 Pa or more.

[0096] <Wearing Degree>

[0097] The abrasion degree (FA) of glass material refers to the value obtained by multiplying the ratio of the abrasion amount of the test sample to the abrasion amount (volume) of the standard sample (H-K9 glass) under exactly the same conditions by 100. It is expressed by the following formula: Where: V—volume abrasion amount of the test sample; V0—volume abrasion amount of the standard sample; W—mass abrasion amount of the test sample; W0—mass abrasion amount of the standard sample; ρ—density of the test sample; ρ0—density of the standard sample.

[0098] In some embodiments, the abrasion degree (FA) of the glass material of the present invention is 200 or less, preferably 175 or less, and more preferably 150 or less.

[0099] <Coefficient of thermal expansion>

[0100] Data on the coefficient of thermal expansion (α20 / 300 ℃) of glass materials at 20-300℃, tested according to the method specified in GB / T7962.16—2010.

[0101] In some embodiments, the coefficient of thermal expansion (α20 / 300 °C) of the glass material of the present invention is 90×10-7 / K or less, preferably 50×10-7 / K-85×10-7 / K, more preferably 55×10-7 / K-80×10-7 / K, and even more preferably 60×10-7 / K-72×10-7 / K.

[0102] <Anti-crystallization performance>

[0103] The test method for the anti-crystallization performance of glass materials is as follows: cut the glass sample into 20×20×10mm dimensions, place it in a muffle furnace at a temperature of Tg+200℃ and hold for 60 minutes, remove it and cool it, then observe whether there is devitrification or crystal particles on the glass surface and inside. If the glass sample has no devitrification or crystal particles, then the glass has excellent anti-crystallization performance.

[0104] According to the aforementioned test method, glass with no devitrification or crystal grains on the surface and no crystal grains inside is recorded as “A”, glass with no crystal grains inside but with devitrification or crystal grains on the surface layer is recorded as “B”, glass with 1-10 crystal grains inside is recorded as “C”, glass with 10-20 crystal grains inside is recorded as “D”, and glass with more than 20 dense crystal grains inside is recorded as “×”.

[0105] In some embodiments, the anti-crystallization performance of the glass material of the present invention is grade B or above, preferably grade A.

[0106] <High Temperature Viscosity>

[0107] The high-temperature viscosity of glass materials is tested using the following method: The rotation method is used with a THETA Rheotronic II high-temperature viscometer. The unit of measurement is dPaS (poise). The smaller the value, the lower the viscosity.

[0108] In some embodiments, the high-temperature viscosity of the glass material of the present invention at 1200°C is less than 60 dPaS, preferably less than 40 dPaS, and more preferably less than 30 dPaS.

[0109] <Average light transmittance of 400-800nm>

[0110] The average light transmittance of the glass material in the 400-800nm ​​range (τ400-800nm) shall be tested according to the method specified in GB / T 7962.12-2010. The higher the average light transmittance in the 400-800nm ​​range, the lower the average light transmission loss of the glass material.

[0111] In some embodiments, the average light transmittance (τ400-800nm) of the glass material with a thickness of 12mm or less is 99.0% or more, preferably 99.5% or more, and more preferably 99.7% or more.

[0112] The thickness of the above-mentioned glass material is preferably 1-12mm, more preferably 2-12mm, even more preferably 5-10mm, and even more preferably 2mm or 5mm or 8mm or 10mm.

[0113] <400nm light transmittance>

[0114] The 400nm light transmittance (τ400nm) of the glass material is tested according to the method specified in GB / T 7962.12-2010. The higher the 400nm light transmittance, the lower the absorption of blue light in the glass material, and the closer the lighting effect is to white light.

[0115] In some embodiments, the light transmittance (τ400nm) of the glass material with a thickness of 12mm or less is 99.0% or more, preferably 99.5% or more, and more preferably 99.7% or more.

[0116] The thickness of the above-mentioned glass material is preferably 1-12mm, more preferably 2-12mm, even more preferably 5-10mm, and even more preferably 2mm or 5mm or 8mm or 10mm.

[0117] [Manufacturing Method]

[0118] The manufacturing method of the glass material of the present invention is as follows: The glass of the present invention is produced using conventional raw materials and processes, including but not limited to using oxides, hydroxides, fluorides, various salts (carbonates, nitrates, sulfates, phosphates, metaphosphates), boric acid, etc. as raw materials. After the raw materials are prepared according to conventional methods, the prepared furnace charge is put into a melting furnace (such as a platinum, gold, or platinum alloy crucible) at 1000-1400℃ for melting. After clarification and homogenization, a homogeneous molten glass without bubbles and undissolved substances is obtained. This molten glass is then cast in a mold and annealed. Those skilled in the art can appropriately select raw materials, process methods, and process parameters according to actual needs.

[0119] [Glass prefabrication and glass components]

[0120] Glass preforms can be manufactured from the glass material using methods such as grinding, hot pressing, or precision stamping. Specifically, glass preforms can be manufactured by machining the glass material, such as grinding and polishing; or by making a preform from the glass material for molding, then hot pressing and grinding the preform; or by precision stamping a preform made through grinding.

[0121] It should be noted that the means of preparing glass preforms are not limited to the means described above. As mentioned above, the glass material of the present invention is useful for various glass components and optical designs, and it is particularly preferred to form preforms from the glass material of the present invention, using the preforms for reheat pressing, precision stamping, etc., to manufacture glass components such as lenses and prisms.

[0122] Both the glass preform and the glass element of the present invention are formed from the glass material of the present invention described above. The glass preform of the present invention possesses the excellent properties of the glass material; the glass element of the present invention possesses the excellent properties of the glass material, and can provide various lenses, prisms and other glass elements with high optical value.

[0123] As examples of lenses, various lenses such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses with spherical or aspherical lens surfaces can be cited.

[0124] The glass material of the present invention can be used to draw glass components such as optical fibers.

[0125] [Optical Instruments]

[0126] The glass elements formed by the glass material of the present invention can be used to manufacture optical instruments such as photographic equipment, video equipment, endoscopes, display devices and monitoring equipment.

[0127] Example

[0128] <Examples of Glass Materials>

[0129] To further illustrate and explain the technical solution of the present invention, the following non-limiting embodiments are provided.

[0130] In this embodiment, a glass material with the composition shown in Tables 1-3 was obtained using the glass material manufacturing method described above. Furthermore, the characteristics of each glass were measured using the testing method described in this invention, and the measurement results are shown in Tables 1-3. In the following embodiments, the average light transmittance (τ400-800nm) and light transmittance (τ400nm) of the glass material at 400-800nm ​​were obtained using test results of a 10mm thick glass material.

[0131] Table 1 Components (wt%) 1# 2# 3# 4# 5# 6# 7# 8# SiO2 21.06 22.59 19.31 25.86 22.03 21.51 18.96 23.94 B2O3 19.25 22.46 21.14 23.35 25.18 22.06 20.24 26.18 La2O3 11.54 16.24 18.15 14.26 15.32 17.16 15.22 14.72 Gd2O3 2.24 0 0.17 0 0.22 0 0.65 0 Y2O3 0.85 0 0 0 0 0.45 0.5 0 Yb2O3 0 0 0 0 0 0 0 0 ZrO2 8.25 5.26 4.85 3.36 4.32 3.05 3.16 2.75 Nb2O5 0 0 0 0.5 0 0 0 0 WO3 0 0 0.1 0 0 0 0 0 ZnO 0.25 0 0 0 0 0 0 0 Li2O 4.23 0 0.36 1.24 1.06 0.75 0.41 0.22 Na2O 0 0 0 0 0 0 0 0 K2O 0 2.3 0 0 0 0 0 0 MgO 0 0 0 0 0.1 0 0 0 CaO 1.24 0 0.45 0 0 0 0 0 SrO 14.18 7.22 10.15 6.27 5.82 9.33 10.25 8.17 BaO 13.53 16.73 19.25 20.36 22.15 20.48 24.32 19.15 TiO2 0 0 0 0 0 0 0 0 Al2O3 3.28 4.65 3.57 4.65 3.75 5.16 6.24 4.82 Ta2O5 0 0 2.45 0 0 0 0 0 P2O5 0 2.35 0 0 0 0 0 0 Sb2O3 0.1 0.2 0.05 0.15 0.05 0.05 0.05 0.05 SnO2 0 0 0 0 0 0 0 0 SnO 0 0 0 0 0 0 0 0 CeO2 0 0 0 0 0 0 0 0 F 0 0 0 0 0 0 0 0 total 100 100 100 100 100 100 100 100 Rn2O 4.23 2.3 0.36 1.24 1.06 0.75 0.41 0.22 Ln2O3 14.63 16.24 18.32 14.26 15.54 17.61 16.37 14.72 B2O3 / SiO2 0.914 0.994 1.095 0.903 1.143 1.026 1.068 1.094 Al2O3 / ZrO2 0.398 0.884 0.736 1.384 0.868 1.692 1.975 1.753 Al2O3 / B2O3 0.170 0.207 0.169 0.199 0.149 0.234 0.308 0.184 SrO / La2O3 1.229 0.445 0.559 0.44 0.38 0.544 0.673 0.555 La2O3 / SiO2 0.548 0.719 0.940 0.551 0.695 0.798 0.803 0.615 ZrO2 / SiO2 0.392 0.233 0.251 0.13 0.196 0.142 0.167 0.115 (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO 0.621 0.319 0.097 0.198 0.22 0.129 0.152 0.027 (ZnO+CaO+Rn2O) / La2O3 0.496 0.142 0.045 0.087 0.069 0.044 0.027 0.015 (La2O3+SrO) / BaO 1.901 1.402 1.470 1.008 0.954 1.293 1.047 1.195 (BaO+SrO) / (ZrO2+Al2O3) 2.403 2.417 3.492 3.325 3.466 3.631 3.678 3.609 nd 1.62246 1.61834 1.63451 1.61334 1.61435 1.62746 1.62346 1.61047 νd 57.33 58.24 59.18 58.56 58.08 57.82 57.46 58.17 α20 / 300℃ (×10-7 / K) 68 64 65 64 63 65 67 61 DW Class 1 Class 1 Class 1 Class 1 Class 1 Class 1 Class 1 Class 1 Tg (°C) 630 622 621 617 621 608 622 615 ρ (g / cm3) 3.43 3.40 3.37 3.34 3.36 3.34 3.37 3.31 E (×107 Pa) 7618 7671 7630 7686 7633 7662 7674 7683 HK (107 Pa) 520 530 528 536 532 535 533 541 FA 152 150 149 142 148 143 146 145 τ 400nm (%) 99.6 99.7 99.7 99.8 99.7 99.8 99.7 99.8 τ 400-800nm (%) 99.7 99.7 99.7 99.8 99.8 99.8 99.8 99.9 Viscosity at 1200℃ (dPaS) 37 30 28 twenty two twenty four 16 20 18 Resistance to crystallization (Grade 1) B A A A A A A A

[0132] Table 2 Components (wt%) 9# 10# 11# 12# 13# 14# 15# 16# SiO2 24.25 18.13 21.53 30.26 24.8 19.78 18.52 20.8 B2O3 19.34 28.78 31.42 22.27 30.82 29.25 18.42 21.33 La2O3 8.65 10.15 20.38 22.53 9.88 12.56 19.62 13.26 Gd2O3 4.35 0 1.33 0.25 0 0 3.11 0 Y2O3 0 1.25 0 1.42 0.38 0 0.25 3.26 Yb2O3 0 0 0 0 0 0 0 0 ZrO2 2.86 1.15 5.24 0.35 1.25 1.37 3.35 4.16 Nb2O5 0 0 0 0 0 0.25 0 0 WO3 0 0 0 0 0.5 0 0 0.23 ZnO 2.5 0 0 0.56 0 1.2 0 1 Li2O 0 0.82 0 0.15 2.65 1.83 0 0.25 Na2O 0 1.42 0 0 0.36 0 0.45 2.4 K2O 0.5 0 1 0 0.52 0 1.25 0 MgO 0 0 0 0.35 0 0 1.27 0 CaO 0 0 0 0 0 0 0 0 SrO 8.55 6.32 2.56 3.75 4.66 4.17 9.21 13.25 BaO 26.35 22.17 12.86 14.52 15.53 23.15 22.53 17.42 TiO2 0.4 0 0.5 0.8 0 0 0 0 Al2O3 0.65 8.26 1.44 2.23 7.25 6.34 1.82 2.54 Ta2O5 0 1.5 0 0.5 0.3 0 0.1 0 P2O5 0.5 0 1.24 0 1 0 0 0.1 Sb2O3 0.1 0.05 0 0.06 0.1 0 0.05 0 SnO2 0 0 0 0 0 0.1 0.05 0 SnO 0 0 0 0 0 0 0 0 CeO2 0 0 0 0 0 0 0 0 F 1 0 0.5 0 0 0 0 0 Total 100 100 100 100 100 100 100 100 Rn2O 0.5 \(2. \dot{2} \dot{4}\) 1 0.15 3.53 1.83 1.7 \(2. \dot{6} \dot{5}\) Ln2O3 13 11.4 21.71 24.2 10.26 12.56 22.98 16.52 B2O3 / SiO2 0.798 1.587 1.459 0.736 1.243 1.479 0.995 1.025 Al2O3 / ZrO2 0.227 7.183 0.275 6.371 5.8 4.628 0.543 0.611 Al2O3 / B2O3 0.034 0.287 0.046 0.1 0.235 0.217 0.099 0.119 SrO / La2O3 0.988 0.623 0.126 0.166 0.472 0.332 0.469 0.999 La2O3 / SiO2 0.357 0.56 0.947 0.745 0.398 0.635 1.059 0.638 ZrO2 / SiO2 0.118 0.063 0.243 0.012 0.05 0.069 0.181 0.2 (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO 0.86 0.552 0.91 0.635 0.839 0.727 0.549 0.522 (ZnO+CaO+Rn2O) / La2O3 0.347 0.221 0.049 0.032 0.357 0.241 0.087 0.275 (La2O3+SrO) / BaO 0.653 0.743 1.784 1.81 0.936 0.723 1.28 1.522 (BaO+SrO) / (ZrO2+Al2O3) 9.943 3.028 2.308 7.081 2.375 3.543 6.139 4.578 nd 1.60436 1.59753 1.64827 1.65428 1.59452 1.60247 1.65127 1.62033 νd 55.76 56.34 59.36 60.45 56.34 57.26 59.32 58.16 α20 / 300℃ (×10-7 / K) 80 75 77 74 73 70 72 70 DW Class 1 Class 1 Class 1 Class 1 Class 1 Class 1 Class 1 Class 1 Tg (°C) 641 625 633 625 623 621 625 626 ρ (g / cm3) 3.45 3.40 3.42 3.40 3.41 3.40 3.38 3.41 E (×107 Pa) 7520 7525 7533 7562 7601 7578 7662 7643 HK (107 Pa) 522 528 518 520 516 523 525 531 FA 163 165 162 160 158 153 151 149 τ 400nm (%) 99.2 99.2 99.2 99.3 99.5 99.6 99.5 99.6 τ 400-800nm (%) 99.3 99.3 99.2 99.3 99.6 99.6 99.6 99.6 Viscosity at 1200℃ (dPaS) 56 45 47 50 42 43 35 33 Resistance to crystallization (Grade 1) A B A B A A A A

[0133] Table 3 Components (wt%) 17# 18# 19# 20# twenty one# twenty two# twenty three# twenty four# SiO2 25.08 26.46 26.66 23.89 26.14 25.41 23.44 23.97 B2O3 24.34 22.52 23.76 23.46 27.18 21.55 24.73 26.16 La2O3 15.02 17.21 15.28 14.62 13.72 14.46 15.25 13.36 Gd2O3 0 0 0 0 0 0 0 0 Y2O3 0 0 0 0 0 0 0 0 Yb2O3 0 0 0 0 0 0 0 0 ZrO2 3.26 2.84 3.18 5.05 2.64 2.74 3.36 3.85 Nb2O5 0 0 0 0 0 0 0 0 WO3 0 0 0 0 0 0 0 0 ZnO 0 0 0 0 0 0 0 0 Li2O 0.15 0.35 0.05 0.37 0.28 0.54 0.62 0.73 Na2O 0 0 0 0 0 0 0 0 K2O 0 0 0 0 0 0 0 0 MgO 0 0 0 0 0 0 0 0 CaO 0 0 0 0 0 0 0 0 SrO 7.45 8.26 9.14 8.26 7.15 10.24 9.52 7.25 BaO 20.54 18.72 17.33 18.65 20.05 21.34 18.42 19.38 TiO2 0 0 0 0 0 0 0 0 Al2O3 4.16 3.64 4.55 5.62 2.84 3.67 4.56 5.25 Ta2O5 0 0 0 0 0 0 0 0 P2O5 0 0 0 0 0 0 0 0 Sb2O3 0 0 0.05 0.08 0 0.02 0.1 0.05 SnO2 0 0 0 0 0 0.03 0 0 SnO 0 0 0 0 0 0 0 0 CeO2 0 0 0 0 0 0 0 0 F 0 0 0 0 0 0 0 0 total 100 100 100 100 100 100 100 100 Rn2O 0.15 0.35 0.05 0.37 0.28 0.54 0.62 0.73 Ln2O3 15.02 17.21 15.28 14.62 13.72 14.46 15.25 13.36 B2O3 / SiO2 0.97 0.851 0.891 0.982 1.04 0.848 1.055 1.091 Al2O3 / ZrO2 1.276 1.282 1.431 1.113 1.076 1.339 1.357 1.364 Al2O3 / B2O3 0.171 0.162 0.191 0.24 0.104 0.17 0.184 0.201 SrO / La2O3 0.496 0.48 0.598 0.565 0.521 0.708 0.624 0.543 La2O3 / SiO2 0.599 0.65 0.573 0.612 0.525 0.569 0.651 0.557 ZrO2 / SiO2 0.13 0.107 0.119 0.211 0.101 0.108 0.143 0.161 (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO 0.02 0.042 0.005 0.045 0.039 0.053 0.065 0.101 (ZnO+CaO+Rn2O) / La2O3 0.01 0.02 0.003 0.025 0.02 0.037 0.041 0.055 (La2O3+SrO) / BaO 1.094 1.361 1.409 1.227 1.041 1.157 1.345 1.063 (BaO+SrO) / (ZrO2+Al2O3) 3.772 4.164 3.424 2.522 4.964 4.927 3.528 2.926 nd 1.61225 1.62453 1.61352 1.61224 1.61085 1.61124 1.61285 1.60872 νd 58.65 57.37 58.06 57.44 58.25 58.36 58.13 57.62 α20 / 300℃ (×10-7 / K) 62 65 63 62 62 65 63 64 DW Class 1 Class 1 Class 1 Class 1 Class 1 Class 1 Class 1 Class 1 Tg (°C) 620 617 610 620 618 616 615 613 ρ (g / cm3) 3.35 3.30 3.36 3.33 3.28 3.35 3.32 3.34 E (×107 Pa) 7675 7659 7723 7718 7692 7705 7694 7678 HK (107 Pa) 538 542 540 535 541 537 542 540 FA 142 145 143 142 140 144 142 143 τ 400nm (%) 99.8 99.9 99.8 99.8 99.9 99.8 99.8 99.8 τ 400-800nm (%) 99.8 99.9 99.9 99.9 99.9 99.9 99.9 99.8 Viscosity at 1200℃ (dPaS) 11 15 12 10 17 14 15 17 Resistance to crystallization (Grade 1) A A A A A A A A

[0134] <Example of Glass Precast Components>

[0135] The glass obtained in Examples 1-24 is used by means such as grinding, or by molding such as hot pressing or precision stamping to produce preforms of various lenses, prisms, etc., such as concave crescent lenses, convex crescent lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses.

[0136] <Example of Glass Components>

[0137] Annealing these preforms obtained in the above glass preform embodiments reduces the deformation inside the glass while fine-tuning it so that the optical properties such as the refractive index reach the required values.

[0138] Next, each preform is ground and polished to produce various lenses and prisms such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. An anti-reflective film can also be coated on the surface of the obtained glass element.

[0139] <Example of an Optical Instrument>

[0140] The glass element obtained by the above glass element embodiment can be used in optical design to form an optical component or optical element by using one or more glass elements. For example, it can be used in imaging devices, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / lighting in the automotive field, lithography, excimer lasers, wafers, computer wafers, and integrated circuits and electronic devices including such circuits and wafers, or for camera equipment and devices in the automotive field. [Simplified Explanation of the Diagram]

[0028] None

Claims

1. A glass material, the components of which are expressed as weight percentages, comprising: SiO2: 17-32%; B2O3: 18-32%; La2O3: 7.5-23%; BaO: 12-27.5%; SrO: 2-15%; ZnO: 0-4.5%; Rn2O: 0-6.5%; and CaO: 0-4%, wherein (ZnO+CaO+Rn2O) / La2O3 is less than 1.0, and the Rn2O is one or more of Li2O, Na2O, and K2O.

2. The glass material as described in claim 1, wherein its components are expressed as weight percentages, further comprises: Al2O3: 0-10%; and / or ZrO2: 0-10%; And / or Gd2O3: 0-8%; and / or Y2O3: 0-8%; and / or Yb2O3: 0-5%; and / or Nb2O5: 0-5%; and / or WO3: 0-5%; and / or MgO: 0-5%; and / or TiO2: 0-5%; and / or Ta2O5: 0-5%; and / or P2O5: 0-4%; and / or F: 0-5%; and / or clarifying agent: 0-1%, wherein the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

3. A glass material, the composition of which, expressed as a weight percentage, is SiO2: 17-32%; B2O3: 18-32%; La2O3: 7.5-23%; BaO: 12-27.5%; SrO: 2-15%; Al2O3: 0-10%; ZrO2: 0-10%; Gd2O3: 0-8%; Y2O3: 0-8%; Yb2O3: 0-5%; Nb2O5: 0-5%; WO3: 0-5%; ZnO: 0-4.5%; Rn2O: 0-6.5%; MgO: 0-5%; CaO: 0-4%; TiO2: 0-5%; Ta2O5: 0-5%; P2O5: 0-4%; F：0-5%； Clarifying agent: 0-1% composition, wherein (ZnO+CaO+Rn2O) / La2O3 is less than 1.0, wherein Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

4. The glass material as described in any one of claims 1 to 3, wherein the composition, expressed as a weight percentage, satisfies one or more of the following ten conditions: 1) Ln2O3: 7.5-28%, wherein the Ln2O3 is the total content of La2O3, Gd2O3, Y2O3, and Yb2O3; 2) B2O3 / SiO2: 0.7-1.7; 3) (La2O3+SrO) / BaO: 0.5-2.5; 4) SrO / La2O3: 0.1-1.5; 5) La2O3 / SiO2: 0.3-1.2; 6) (BaO+SrO) / (ZrO2+Al2O3): 1.0-15.0; 7) Al2O3 / B2O3: 0.01-0.45; 8) ZrO2 / SiO2: 0.01-0.4; 9) Al2O3 / ZrO2 is 0.2-8.0; 10) (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO is below 1.

0.

5. The glass material as described in any one of claims 1 to 3, wherein the composition, expressed as a weight percentage, satisfies one or more of the following 11 conditions: 1) Ln2O3: 10-25%, wherein the Ln2O3 is the total content of La2O3, Gd2O3, Y2O3, and Yb2O3; 2) B2O3 / SiO2: 0.8-1.3; 3) (La2O3+SrO) / BaO: 0.8-1.8; 4) SrO / La2O3: 0.3-1.0; 5) La2O3 / SiO2: 0.4-0.9; 6) (BaO+SrO) / (ZrO2+Al2O3): 2.0-8.0; 7) Al2O3 / B2O3: 0.05-0.4; 8) ZrO2 / SiO2: 0.05-0.35; 9) Al2O3 / ZrO2 is 0.8-4.0; 10) (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO is less than 0.5; 11) (ZnO+CaO+Rn2O) / La2O3 is less than 0.

5.

6. The glass material as described in any one of claims 1 to 3, wherein the composition, expressed as a weight percentage, satisfies one or more of the following 11 conditions: 1) Ln2O3: 11-20%, wherein the Ln2O3 is the total content of La2O3, Gd2O3, Y2O3, and Yb2O3; 2) B2O3 / SiO2: 0.85-1.1; 3) (La2O3+SrO) / BaO: 0.9-1.5; 4) SrO / La2O3: 0.35-0.8; 5) La2O3 / SiO2: 0.45-0.8; 6) (BaO+SrO) / (ZrO2+Al2O3): 2.5-5.0; 7) Al2O3 / B2O3: 0.1-0.3; 8) ZrO2 / SiO2: 0.1-0.3; 9) Al2O3 / ZrO2 is 1.0-2.0; 10) (Y2O3+Gd2O3+ZnO+CaO+Rn2O) / SrO is less than 0.3; 11) (ZnO+CaO+Rn2O) / La2O3 is less than 0.

3.

7. The glass material as described in any one of claims 1 to 3, wherein the composition, expressed as a weight percentage, comprises: SiO2: 21-30%; and / or B2O3: 21-30%; and / or La2O3: 11-20%; and / or BaO: 15-25%; and / or SrO: 3-13%; and / or Al2O3: 1-8%; and / or ZrO2: 0.5-8%; and / or Gd2O3: 0-5%; and / or Y2O3: 0-5%; and / or Yb2O3: 0-3%; and / or Nb2O5: 0-3%; and / or WO3: 0-3%; and / or ZnO: 0-3%; and / or Rn2O: 0-5%; and / or MgO: 0-3%; and / or CaO: 0-3%; and / or TiO2: 0-3%; and / or Ta2O5: 0-3%; and / or P2O5: 0-2%; and / or F: 0-3%; and / or clarifying agent: 0-0.5%, wherein the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

8. The glass material as described in any one of claims 1 to 3, wherein the components, expressed as a percentage by weight, comprise: SiO2: 22-28%; and / or B2O3: 22-29%; and / or La2O3: 12-18%; and / or BaO: 16-23%; and / or SrO: 5.5-11%; and / or Al2O3: 2-7%; and / or ZrO2: 1-7%; and / or Gd2O3: 0-1.5%; and / or Y2O3: 0-1.5%; and / or Yb2O3: 0-2%; and / or Nb2O5: 0-1%; and / or WO3: 0-1%; and / or ZnO: 0-2%; and / or Rn2O: 0-2%; and / or MgO: 0-2%; and / or CaO: 0-2%; and / or TiO2: 0-2%; and / or Ta2O5: 0-1%; and / or P2O5: 0-1%; and / or F: 0-2%; and / or clarifying agent: 0-0.2%, wherein the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

9. The glass material as described in any one of claims 1 to 3, wherein the composition is expressed as a weight percentage, wherein: Li2O: 0-5%; and / or Na2O: 0-5%; And / or K2O: 0-5%.

10. The glass material as described in any one of claims 1 to 3, wherein the composition is expressed as a weight percentage, wherein: Li2O: 0-2%; and / or Na2O: 0-2%; And / or K2O: 0-2%.

11. The glass material as described in any one of claims 1 to 3, wherein the composition does not contain Gd2O3; and / or Y2O3; and / or Yb2O3; and / or Nb2O5; and / or WO3; and / or ZnO; and / or MgO; and / or CaO; and / or TiO2; and / or Ta2O5; and / or P2O5; and / or F; and / or Na2O; and / or K2O.

12. The glass material as described in any one of claims 1 to 3, wherein the average light transmittance τ400-800nm ​​of the glass material with a thickness of 1-12mm is 99.0% or more; and / or the light transmittance τ400nm of the glass material with a thickness of 1-12mm is 99.0% or more; and / or the refractive index nd is 1.59-1.66; and / or the Abbe number νd is 55-61; and / or the transition temperature Tg is 650°C. Below ℃; and / or water resistance stability DW is Class 2 or above; and / or density ρ is below 3.60 g / cm3; and / or Knoop hardness HK is above 500×107 Pa; and / or Young's modulus E is above 7000×107 Pa; and / or abrasion degree FA is below 200; and / or coefficient of thermal expansion α20 / 300℃ is below 90×10-7 / K; and / or high-temperature viscosity at 1200℃ is below 60 dPaS; and / or anti-crystallization performance is Class B or above.

13. The glass material as described in any one of claims 1 to 3, wherein the average light transmittance τ400-800nm ​​of the glass material with a thickness of 1-12mm is 99.7% or more; and / or the light transmittance τ400nm of the glass material with a thickness of 1-12mm is 99.7% or more; and / or the refractive index nd is 1.61-1.64; and / or the Abbe number νd is 57-59; and / or the transition temperature Tg is 610-64. 0℃; and / or water resistance stability (DW) is Class 1; and / or density (ρ) is below 3.40 g / cm3; and / or Knoop hardness (HK) is above 530 × 107 Pa; and / or Young's modulus (E) is above 7600 × 107 Pa; and / or abrasion resistance (FA) is below 150; and / or coefficient of thermal expansion (α) at ​​20℃ / 300℃ is 60 × 10⁻⁷ / K - 72 × 10⁻⁷ / K; and / or high-temperature viscosity at 1200℃ is below 30 dPaS; and / or anti-crystallization performance is Grade A.

14. A glass element made of the glass material described in any one of claims 1 to 13.

15. An optical instrument comprising a glass material as described in any one of claims 1 to 13, or comprising a glass element as described in claim 14.