Optical glass, glass preform, optical element and optical instrument

Abstract

Provided in the present invention is optical glass. The optical glass comprises the following components, in percentages by weight: SiO2+B2O3: 3-18%; La2O3+Y2O3+Gd2O3: 45-65%; ZrO2: 3-13%; Nb2O5: 3-15%; and TiO2: 8-22%, wherein (La2O3+Gd2O3) / Nb2O5 is 3.5-15.0. By means of reasonable component design, the optical glass of the present invention has the desired refractive index and Abbe number, and also has a relatively low thermal expansion coefficient and a good light transmittance.

Description

Optical glass, glass preforms, optical components and optical instruments Technical Field

[0001] The present invention relates to optical glass, in particular to optical glass with a refractive index of 1.98 or higher and an Abbe number of 22 to 31, and a glass preform, an optical element and an optical instrument made of the same. Background Art

[0002] High-refractive-index optical glass is a key material for manufacturing diffractive waveguide components for augmented reality / mixed reality (AR / MR) devices. Its refractive index determines the field of view (FOV) of AR / MR devices. For example, optical glass with a refractive index of 1.9 can achieve a FOV of 65°. However, in practical applications, optical glass with a higher refractive index is required to enhance the FOV of AR / MR devices and provide users with a near-realistic user experience. Furthermore, lenses formed from high-refractive-index optical glass can miniaturize optical systems. Ultra-high-refractive-index optical glass with a refractive index of 1.98 or higher is experiencing increasing market demand.

[0003] CN102050574A discloses an ultra-high refractive index optical glass with a refractive index of 2.0 to 2.3 and an Abbe number of 17 to 25. The glass is a B2O3-Bi2O3-Ga2O3 system glass. Although it has a relatively high refractive index, it can be seen from its embodiments that λ 70 The optimal wavelength is 490nm, and the optimal λ5 is 428nm. This glass has low light transmittance, significantly reducing the brightness of AR / MR devices. On the other hand, optical components installed in automotive optical instruments and heat-generating optical devices such as projectors, copiers, and laser printers are used in environments with large temperature fluctuations. If the thermal expansion coefficient of the optical glass is too large, the thermal expansion of the optical component due to changes in ambient temperature will differ from the expansion coefficient of the optical component fixture, causing stress in the optical component and further birefringence, which can affect imaging characteristics. Therefore, optical glass with a low thermal expansion coefficient is desirable.

[0004] Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an optical glass with a refractive index of 1.98 or more, an Abbe number of 22 to 31, a low thermal expansion coefficient and excellent light transmittance.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] (1) Optical glass, the components of which, expressed in percentage by weight, contain: SiO2 + B2O3: 3-18%; La2O3 + Y2O3 + Gd2O3: 45-65%; ZrO2: 3-13%; Nb2O5: 3-15%; TiO2: 8-22%, wherein (La2O3 + Gd2O3) / Nb2O5 is 3.5-15.0.

[0008] (2) The optical glass according to (1), wherein the components are expressed in weight percentage and further contain: ZnO: 0-5%; and / or RO: 0-6%; and / or Rn2O: 0-5%; and / or WO3: 0-5%; and / or Ta2O5: 0-5%; and / or Al2O3: 0-5%; and / or Yb2O3: 0-8%; and / or GeO2: 0-3%; and / or P2O5: 0-4%; and / or clarifier: 0-1%, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

[0009] (3) Optical glass containing ZrO2, Nb2O5, and TiO2 as essential components, wherein the components, expressed in weight percentage, contain 3 to 18% of SiO2 + B2O3 and 45 to 65% of La2O3 + Y2O3 + Gd2O3, wherein (La2O3 + Gd2O3) / Nb2O5 is 3.5 to 15.0, and the refractive index of the optical glass is n d is 1.98 or more, the Abbe number ν d The thermal expansion coefficient is 22 to 31, -30 / 70℃ 90×10 -7 / K or less.

[0010] (4) The optical glass according to (3), wherein the components are expressed in weight percentage and further contain: ZrO2: 3-13%; and / or Nb2O5: 3-15%; and / or TiO2: 8-22%; and / or ZnO: 0-5%; and / or RO: 0-6%; and / or Rn2O: 0-5%; and / or WO3: 0-5%; and / or Ta2O5: 0-5%; and / or Al2O3: 0-5%; and / or Yb2O3: 0-8%; and / or GeO2: 0-3%; and / or P2O5: 0-4%; and / or a clarifier: 0-1%, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

[0011] (5) The optical glass according to any one of (1) to (4), wherein the composition is expressed in weight percentage, wherein: (La2O3+Gd2O3) / Nb2O5 is 4.0 to 10.0, preferably (La2O3+Gd2O3) / Nb2O5 is 5.0 to 8.0, and more preferably (La2O3+Gd2O3) / Nb2O5 is 5.5 to 6.5.

[0012] (6) The optical glass according to any one of (1) to (4), wherein the composition is expressed in weight percentage, wherein: SiO2 / B2O3 is 0.4 to 4.0, preferably SiO2 / B2O3 is 0.5 to 3.0, more preferably SiO2 / B2O3 is 0.6 to 2.0, and further preferably SiO2 / B2O3 is 0.7 to 1.2.

[0013] (7) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: (ZnO + Y2O3) / Gd2O3 is less than 0.8, preferably (ZnO + Y2O3) / Gd2O3 is less than 0.6, more preferably (ZnO + Y2O3) / Gd2O3 is 0.01 to 0.5, and further preferably (ZnO + Y2O3) / Gd2O3 is 0.05 to 0.3.

[0014] (8) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: (SiO2 + B2O3) / Gd2O3 is 0.3 to 2.5, preferably (SiO2 + B2O3) / Gd2O3 is 0.4 to 2.0, more preferably (SiO2 + B2O3) / Gd2O3 is 0.5 to 1.5, and further preferably (SiO2 + B2O3) / Gd2O3 is 0.7 to 1.2.

[0015] (9) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: ZnO / (SiO2+B2O3) is less than 0.8, preferably ZnO / (SiO2+B2O3) is less than 0.6, more preferably ZnO / (SiO2+B2O3) is 0.01 to 0.5, and further preferably ZnO / (SiO2+B2O3) is 0.02 to 0.3.

[0016] (10) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: (SiO2+B2O3+La2O3) / ZrO2 is 4.0 to 15.0, preferably (SiO2+B2O3+La2O3) / ZrO2 is 5.0 to 12.0, more preferably (SiO2+B2O3+La2O3) / ZrO2 is 6.5 to 10.0, and further preferably (SiO2+B2O3+La2O3) / ZrO2 is 7.5 to 9.0.

[0017] (11) The optical glass according to any one of (1) to (4), wherein the composition is expressed in weight percentage, wherein: B2O3 / TiO2 is 0.1 to 1.0, preferably B2O3 / TiO2 is 0.2 to 0.8, more preferably B2O3 / TiO2 is 0.2 to 0.7, and further preferably B2O3 / TiO2 is 0.3 to 0.5.

[0018] (12) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: (Gd2O3+Nb2O5+TiO2) / (SiO2+B2O3) is 1.0 to 8.0, preferably (Gd2O3+Nb2O5+TiO2) / (SiO2+B2O3) is 1.5 to 6.0, more preferably (Gd2O3+Nb2O5+TiO2) / (SiO2+B2O3) is 2.0 to 5.0, and further preferably (Gd2O3+Nb2O5+TiO2) / (SiO2+B2O3) is 2.5 to 4.0.

[0019] (13) The optical glass according to any one of (1) to (4), wherein the composition is expressed in weight percentage, wherein: (Gd2O3+TiO2) / (La2O3+Nb2O5) is 0.3 to 0.9, preferably (Gd2O3+TiO2) / (La2O3+Nb2O5) is 0.35 to 0.8, more preferably (Gd2O3+TiO2) / (La2O3+Nb2O5) is 0.4 to 0.7, and further preferably (Gd2O3+TiO2) / (La2O3+Nb2O5) is 0.45 to 0.6.

[0020] (14) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: (B2O3+La2O3) / (Gd2O3+Nb2O5+TiO2) is 0.7 to 2.5, preferably (B2O3+La2O3) / (Gd2O3+Nb2O5+TiO2) is 0.8 to 2.0, more preferably (B2O3+La2O3) / (Gd2O3+Nb2O5+TiO2) is 0.9 to 1.7, and further preferably (B2O3+La2O3) / (Gd2O3+Nb2O5+TiO2) is 1.0 to 1.5.

[0021] (15) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: (B2O3+La2O3) / (Gd2O3+SiO2) is 1.5 to 5.5, preferably (B2O3+La2O3) / (Gd2O3+SiO2) is 2.0 to 4.0, more preferably (B2O3+La2O3) / (Gd2O3+SiO2) is 2.3 to 3.3, and further preferably (B2O3+La2O3) / (Gd2O3+SiO2) is 2.5 to 3.2.

[0022] (16) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: B2O3 / (ZrO2+Y2O3) is 0.2 to 2.5, preferably B2O3 / (ZrO2+Y2O3) is 0.4 to 2.0, more preferably B2O3 / (ZrO2+Y2O3) is 0.5 to 1.5, and further preferably B2O3 / (ZrO2+Y2O3) is 0.6 to 1.0.

[0023] (17) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: RO / Nb2O5 is less than 0.8, preferably RO / Nb2O5 is less than 0.5, more preferably RO / Nb2O5 is less than 0.3, and further preferably RO / Nb2O5 is less than 0.1, and the RO is one or more of MgO, CaO, SrO, and BaO.

[0024] (18) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: (B2O3+La2O3+Y2O3+RO) / Gd2O3 is 2.0 to 7.0, preferably (B2O3+La2O3+Y2O3+RO) / Gd2O3 is 2.5 to 6.0, more preferably (B2O3+La2O3+Y2O3+RO) / Gd2O3 is 3.0 to 4.6, and further preferably (B2O3+La2O3+Y2O3+RO) / Gd2O3 is 3.5 to 4.5, and the RO is one or more of MgO, CaO, SrO, and BaO.

[0025] (19) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: (RO + GeO2 + Y2O3 + Ta2O5) / La2O3 is less than 0.3, preferably (RO + GeO2 + Y2O3 + Ta2O5) / La2O3 is less than 0.2, more preferably (RO + GeO2 + Y2O3 + Ta2O5) / La2O3 is less than 0.15, and further preferably (RO + GeO2 + Y2O3 + Ta2O5) / La2O3 is less than 0.1, and the RO is one or more of MgO, CaO, SrO, and BaO.

[0026] (20) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: SiO2 + B2O3: 5-15%, preferably SiO2 + B2O3: 7-13%; and / or La2O3 + Y2O3 + Gd2O3: 50-63%, preferably La2O3 + Y2O3 + Gd2O3: 52-60%; and / or ZrO2: 4-11%, preferably ZrO2: 6-10%; and / or Nb2O5: 5-13%, preferably Nb2O5: 7-12%; and / or TiO2: 10-20%, preferably TiO2: 13-18%; and / or ZnO: 0-4%, preferably ZnO: 0.1-3%; and / or RO: 0-4%, preferably RO: 0-2%; and / or Rn2O: 0-3%, preferably Rn2O: 0-1%; and / or WO3: 0-3%, preferably WO3: 0-1%; and / or Ta2O5: 0-3%, preferably Ta2O5: 0-1%; and / or Al2O3: 0-3%, preferably Al2O3: 0-1%; and / or Yb2O3: 0-5%, preferably Yb2O3: 0-1%; and / or GeO2: 0-2%, preferably GeO2: 0-1%; and / or P2O5: 0-2%, preferably P2O5: 0-1%; and / or clarifier: 0-0.5%, preferably clarifier: 0-0.2%, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

[0027] (21) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: SiO2: 1 to 10%, preferably SiO2: 2 to 8%, more preferably SiO2: 3 to 7%; and / or B2O3: 1 to 10%, preferably B2O3: 2 to 9%, more preferably B2O3: 4 to 8%; and / or La2O3: 35 to 50%, preferably La2O3: 37 to 47%, more preferably La2O3: 41 to 46%; and / or Y2O3: 0 to 6%, preferably Y2O3: 0 to 4%, more preferably Y2O3: 0.1 to 3%; and / or Gd2O3: 6 to 20%, preferably Gd2O3: 8 to 18%, more preferably Gd2O3: 11 to 15%.

[0028] (22) The optical glass according to any one of (1) to (4), wherein the components do not contain WO3; and / or do not contain Ta2O5; and / or do not contain RO; and / or do not contain Rn2O; and / or do not contain P2O5; and / or do not contain Al2O3; and / or do not contain GeO2; and / or do not contain Yb2O3, wherein RO is one or more of MgO, CaO, SrO, and BaO, and Rn2O is one or more of Li2O, Na2O, and K2O.

[0029] (23) The refractive index n of the optical glass according to any one of (1) to (4) d is 1.98 or more, preferably 1.99 or more, more preferably 2.00 to 2.15, further preferably 2.01 to 2.10, and further preferably 2.03 to 2.07. The Abbe number v d It is 22-31, preferably 23-30, more preferably 24-29, and further preferably 25-28.

[0030] (24) The thermal expansion coefficient α of the optical glass according to any one of (1) to (4) -30 / 70℃ 90×10 -7 / K or less, preferably 80×10 -7 / K or less, more preferably 75×10 -7 / K or less; and / or acid resistance stability D A Two or more types, preferably one type; and / or 70 480nm or less, preferably λ 70 470nm or less, more preferably λ 70 465nm or less; and / or λ5 is 390nm or less, preferably λ5 is 380nm or less, more preferably λ5 is 375nm or less; and / or weather resistance CR is 2 or more, preferably 1; and / or Knoop hardness H K 630×10 7 Pa or more, preferably 650×10 7 Pa or more, more preferably 660×10 7 Pa or more; and / or Young's modulus E is 11000×10 7 Pa or more, preferably 12000×10 7 Pa or more, more preferably 13000×10 7 Pa or more; and / or the bubble degree is A grade or more, preferably A0 grade or more, more preferably A 00 Grade; and / or density ρ is 5.50g / cm 3 Below, preferably 5.40g / cm 3 Below, more preferably 5.30g / cm 3 Below; and / or wear FA It is 90-140, preferably 100-130, more preferably 110-123.

[0031] (25) A glass preform made of any one of the optical glasses described in (1) to (24).

[0032] (26) An optical element made of the optical glass described in any one of (1) to (24), or made of the glass preform described in (25).

[0033] (27) An optical instrument comprising the optical glass described in any one of (1) to (24) and / or the optical element described in (26).

[0034] The beneficial effects of the present invention are: through reasonable component design, the optical glass of the present invention has a desired refractive index and Abbe number, as well as a low thermal expansion coefficient and excellent light transmittance. DETAILED DESCRIPTION

[0035] The following describes in detail embodiments of the optical glass of the present invention. However, the present invention is not limited to the embodiments described below and can be implemented with appropriate modifications within the scope of the present invention. Furthermore, although repeated descriptions may be omitted as appropriate, this does not limit the scope of the invention. In the following description, the optical glass of the present invention may be simply referred to as "glass."

[0036] [Optical glass]

[0037] The following describes the ranges of the various components (ingredients) of the optical glass of the present invention. In the present invention, unless otherwise specified, the content and total content of each component are all expressed in weight percentage (wt%), that is, the content and total content of each component are expressed as the weight percentage of the total amount of the glass material converted into an oxide composition. Here, the "composition converted into oxides" refers to the case where the oxides, complex salts, hydroxides, etc. used as raw materials for the optical glass of the present invention decompose and convert to oxides during melting, with the total amount of the oxide material being taken as 100%.

[0038] Unless otherwise indicated in specific circumstances, the numerical ranges listed in the present invention include upper and lower limits, and "above" and "below" include the endpoint values, as well as all integers and fractions included in the range, without being limited to the specific values ​​listed when defining the range. The term "and / or" herein is inclusive, for example, "A and / or B" means only A, or only B, or both A and B.

[0039] <Essential Components and Optional Components>

[0040] SiO2 can increase the viscosity of molten glass, reduce the coloring of glass, improve the chemical stability of glass, and increase the resistance to devitrification. In the present invention, the above-mentioned effects are achieved by containing SiO2 at least 1%. Preferably, the content of SiO2 is at least 2%, and more preferably, the content of SiO2 is at least 3%. If the content of SiO2 is too high, the melting difficulty of the glass increases, the transition temperature rises, and the refractive index decreases. Therefore, in the present invention, the content of SiO2 is upper limited to 10%, preferably upper limited to 8%, and more preferably upper limited to 7%.

[0041] B2O3 improves the meltability and devitrification resistance of glass, which helps lower the glass transition temperature. The present invention achieves this effect by containing at least 1% B2O3, preferably at least 2%, and more preferably at least 4%. Excessive B2O3 content impairs the chemical stability of the glass and reduces its refractive index, hindering the high refractive index achieved in the present invention. Therefore, the B2O3 content is 10% or less, preferably 9% or less, and more preferably 8% or less.

[0042] In some embodiments, controlling the combined content of SiO2 and B2O3 (SiO2 + B2O3) within a range of 3 to 18% is beneficial for improving the chemical stability of the glass and optimizing the abrasiveness of the glass. Therefore, the combined content of SiO2 + B2O3 is preferably 3 to 18%, more preferably 5 to 15%, and even more preferably 7 to 13%.

[0043] In some embodiments, controlling the ratio of SiO2 to B2O3 (SiO2 / B2O3) within a range of 0.4 to 4.0 is beneficial for improving the anti-devitrification property of the glass and optimizing the weather resistance and Young's modulus of the glass. Therefore, SiO2 / B2O3 is preferably 0.4 to 4.0, more preferably 0.5 to 3.0, further preferably 0.6 to 2.0, and even more preferably 0.7 to 1.2.

[0044] La2O3 is an effective component for increasing the refractive index of glass and significantly improves its chemical stability and resistance to devitrification. If its content is less than 35%, achieving the desired optical constants is difficult. If it exceeds 50%, the glass's tendency to devitrify increases, and its thermal stability deteriorates. Therefore, the La2O3 content is limited to 35-50%, preferably 37-47%, and more preferably 41-46%.

[0045] Gd2O3 can increase the refractive index and chemical stability of glass, improving its thermal stability. However, if its content is too high, the glass's resistance to devitrification deteriorates and the raw material cost increases. Therefore, the Gd2O3 content is 6-20%, preferably 8-18%, and more preferably 11-15%.

[0046] In some embodiments, the ratio of the total content of SiO2 and B2O3 (SiO2+B2O3) to the content of Gd2O3 ((SiO2+B2O3) / Gd2O3)) is controlled within a range of 0.3 to 2.5, which can optimize the abrasiveness and blistering of the glass and increase the Young's modulus of the glass. Therefore, (SiO2+B2O3) / Gd2O3 is preferably 0.3 to 2.5, more preferably (SiO2+B2O3) / Gd2O3 is 0.4 to 2.0, further preferably (SiO2+B2O3) / Gd2O3 is 0.5 to 1.5, and even more preferably (SiO2+B2O3) / Gd2O3 is 0.7 to 1.2.

[0047] In some embodiments, controlling the ratio (B2O3+La2O3) / (Gd2O3+SiO2) between the combined content of B2O3 and La2O3 (B2O3+La2O3) and the combined content of Gd2O3 and SiO2 (Gd2O3+SiO2) (B2O3+La2O3) / (Gd2O3+SiO2) within a range of 1.5 to 5.5 is beneficial for reducing the density of the glass and improving the chemical stability of the glass. Therefore, preferably, (B2O3+La2O3) / (Gd2O3+SiO2) is 1.5 to 5.5, and more preferably, (B2O3+La2O3) / (Gd2O3+SiO2) is 2.0 to 4.0. Furthermore, controlling (B2O3+La2O3) / (Gd2O3+SiO2) within a range of 2.3 to 3.3 can further optimize the bubble density and Young's modulus of the glass. Therefore, it is further preferred that (B2O3+La2O3) / (Gd2O3+SiO2) is 2.3 to 3.3, and it is further preferred that (B2O3+La2O3) / (Gd2O3+SiO2) is 2.5 to 3.2.

[0048] Y2O3 can improve the refractive index and devitrification resistance of glass. If its content is too high, the chemical stability and weather resistance of the glass will deteriorate. Therefore, the content of Y2O3 in the present invention is 0-6%, preferably 0-4%, and more preferably 0.1-3%.

[0049] In some embodiments, the combined content of La2O3, Y2O3, and Gd2O3 (La2O3+Y2O3+Gd2O3) is controlled within a range of 45-65%. This makes it easier for the glass to achieve a desired refractive index and Abbe number, while also optimizing the glass's devitrification resistance and weather resistance. Therefore, the combined content of La2O3+Y2O3+Gd2O3 is preferably 45-65%, more preferably 50-63%, and even more preferably 52-60%.

[0050] Yb2O3 is a component that imparts high refractive index and low dispersion to glass. If its content exceeds 8%, the glass's anti-devitrification properties decrease. Therefore, the Yb2O3 content is 0-8%, preferably 0-5%, more preferably 0-1%, and even more preferably, no Yb2O3 is present.

[0051] ZrO2 can improve the devitrification resistance of glass and improve its chemical stability and mechanical properties. However, if its content is too high, it will increase the melting difficulty of the glass, increase the melting temperature, and lead to the formation of inclusions inside the glass and a decrease in light transmittance. Therefore, the ZrO2 content in the present invention is 3-13%, preferably 4-11%, and more preferably 6-10%.

[0052] In some embodiments, the ratio of the total content of SiO2, B2O3, and La2O3 (SiO2 + B2O3 + La2O3) to the content of ZrO2 ((SiO2 + B2O3 + La2O3) / ZrO2)) is controlled within a range of 4.0 to 15.0, which can improve the Young's modulus and hardness of the glass and optimize the weather resistance of the glass. Therefore, (SiO2 + B2O3 + La2O3) / ZrO2 is preferably 4.0 to 15.0, more preferably (SiO2 + B2O3 + La2O3) / ZrO2 is 5.0 to 12.0, further preferably (SiO2 + B2O3 + La2O3) / ZrO2 is 6.5 to 10.0, and even more preferably (SiO2 + B2O3 + La2O3) / ZrO2 is 7.5 to 9.0.

[0053] In some embodiments, controlling the ratio of the B2O3 content to the combined content of ZrO2 and Y2O3 (ZrO2 + Y2O3), B2O3 / (ZrO2 + Y2O3), within a range of 0.2 to 2.5 can improve the chemical stability and thermal expansion coefficient of the glass and prevent a decrease in the hardness of the glass. Therefore, B2O3 / (ZrO2 + Y2O3) is preferably 0.2 to 2.5, more preferably 0.4 to 2.0, further preferably 0.5 to 1.5, and even more preferably 0.6 to 1.0.

[0054] Nb2O5 can increase the refractive index and devitrification resistance of glass and reduce its thermal expansion coefficient. In the present invention, the above effects are achieved by containing 3% or more Nb2O5. The preferred lower limit for the Nb2O5 content is 5%, and more preferably 7%. If the Nb2O5 content exceeds 15%, the thermal stability and weather resistance of the glass decrease, and the light transmittance decreases. Therefore, in the present invention, the upper limit for the Nb2O5 content is 15%, preferably 13%, and more preferably 12%.

[0055] In some embodiments, the ratio of the total content of La2O3 and Gd2O3 (La2O3+Gd2O3) to the content of Nb2O5 ((La2O3+Gd2O3) / Nb2O5)) is controlled within a range of 3.5 to 15.0, which is beneficial for reducing the thermal expansion coefficient of the glass while obtaining the desired refractive index and Abbe number, and optimizing the light transmittance and Young's modulus. Therefore, (La2O3+Gd2O3) / Nb2O5 is preferably 3.5 to 15.0, more preferably (La2O3+Gd2O3) / Nb2O5 is 4.0 to 10.0, further preferably (La2O3+Gd2O3) / Nb2O5 is 5.0 to 8.0, and even more preferably (La2O3+Gd2O3) / Nb2O5 is 5.5 to 6.5.

[0056] TiO2 can increase the refractive index of glass, improve its stability, and reduce its density. If its content is too high, the Abbe number of the glass will not meet the design requirements, and the light transmittance of the glass will decrease. Therefore, the TiO2 content is 8-22%, preferably 10-20%, and more preferably 13-18%.

[0057] In some embodiments, controlling the ratio of B2O3 to TiO2 (B2O3 / TiO2) within a range of 0.1 to 1.0 can improve the bubble content and chemical stability of the glass and prevent a decrease in the light transmittance of the glass. Therefore, B2O3 / TiO2 is preferably 0.1 to 1.0, more preferably 0.2 to 0.8, further preferably 0.2 to 0.7, and even more preferably 0.3 to 0.5.

[0058] In some embodiments, the ratio of the total content of Gd2O3, Nb2O5 and TiO2 Gd2O3+Nb2O5+TiO2 to the total content of SiO2 and B2O3 SiO2+B2O3 (Gd2O3+Nb2O5+TiO2) / (SiO2+B2O3) is controlled within the range of 1.0 to 8.0, which is beneficial to reducing the density and thermal expansion coefficient of the glass and improving the chemical stability and light transmittance of the glass. Therefore, (Gd2O3+Nb2O5+TiO2) / (SiO2+B2O3) is preferably 1.0~8.0, (Gd2O3+Nb2O5+TiO2) / (SiO2+B2O3) is more preferably 1.5~6.0, (Gd2O3+Nb2O5+TiO2) / (SiO2+B2O3) is further preferably 2.0~5.0, and (Gd2O3+Nb2O5+TiO2) / (SiO2+B2O3) is further preferably 2.5~4.0.

[0059] In some embodiments, the ratio of the total content of Gd2O3 and TiO2 Gd2O3+TiO2 to the total content of La2O3 and Nb2O5 La2O3+Nb2O5 (Gd2O3+TiO2) / (La2O3+Nb2O5) is controlled within the range of 0.3 to 0.9, which can optimize the density and abrasiveness of the glass and improve the anti-crystallization performance and weather resistance of the glass. Therefore, the preferred ratio of (Gd2O3+TiO2) / (La2O3+Nb2O5) is 0.3~0.9, the more preferred ratio of (Gd2O3+TiO2) / (La2O3+Nb2O5) is 0.35~0.8, the further preferred ratio of (Gd2O3+TiO2) / (La2O3+Nb2O5) is 0.4~0.7, and the further preferred ratio of (Gd2O3+TiO2) / (La2O3+Nb2O5) is 0.45~0.6.

[0060] In some embodiments, the ratio of the total content of B2O3 and La2O3 (B2O3+La2O3) to the total content of Gd2O3, Nb2O5, and TiO2 (Gd2O3+Nb2O5+TiO2) (B2O3+La2O3) / (Gd2O3+Nb2O5+TiO2) is controlled within the range of 0.7 to 2.5, which can increase the bubble degree of the glass and prevent the deterioration of the Young's modulus and hardness of the glass. Therefore, the preferred ratio of (B2O3+La2O3) / (Gd2O3+Nb2O5+TiO2) is 0.7~2.5, the more preferred ratio of (B2O3+La2O3) / (Gd2O3+Nb2O5+TiO2) is 0.8~2.0, the further preferred ratio of (B2O3+La2O3) / (Gd2O3+Nb2O5+TiO2) is 0.9~1.7, and the further preferred ratio of (B2O3+La2O3) / (Gd2O3+Nb2O5+TiO2) is 1.0~1.5.

[0061] ZnO improves the devitrification resistance of glass, enhances the solubility of glass raw materials, and reduces the high-temperature viscosity and transition temperature of glass. Excessive ZnO content increases the difficulty of glass molding and reduces thermal stability. Therefore, the ZnO content is preferably 0-5%, preferably 0-4%, and more preferably 0.1-3%.

[0062] In some embodiments, the ratio of the total content of ZnO and Y2O3, ZnO+Y2O3, to the content of Gd2O3, (ZnO+Y2O3) / Gd2O3, is controlled to be below 0.8, which is beneficial to improving the Young's modulus and anti-crystallization performance of the glass. Therefore, it is preferred that (ZnO+Y2O3) / Gd2O3 is below 0.8, and more preferably (ZnO+Y2O3) / Gd2O3 is below 0.6. Furthermore, controlling (ZnO+Y2O3) / Gd2O3 within the range of 0.01 to 0.5 can further optimize the bubble degree of the glass. Therefore, it is further preferred that (ZnO+Y2O3) / Gd2O3 is 0.01 to 0.5, and it is even more preferred that (ZnO+Y2O3) / Gd2O3 is 0.05 to 0.3.

[0063] In some embodiments, controlling the ratio of ZnO content to the total content of SiO2 and B2O3 (SiO2 + B2O3) (ZnO / (SiO2 + B2O3)) to below 0.8 is beneficial for improving the chemical stability and bubble content of the glass. Therefore, ZnO / (SiO2 + B2O3) is preferably below 0.8, and more preferably ZnO / (SiO2 + B2O3) is below 0.6. Furthermore, controlling ZnO / (SiO2 + B2O3) within the range of 0.01 to 0.5 can further optimize the thermal expansion coefficient of the glass. Therefore, ZnO / (SiO2 + B2O3) is more preferably between 0.01 and 0.5, and even more preferably between 0.02 and 0.3.

[0064] Alkaline earth metal oxides (RO) (RO is one or more of MgO, CaO, SrO, and BaO) can adjust the optical constants of glass and optimize its chemical stability. However, high RO content can reduce the glass's resistance to devitrification. Therefore, the RO content is limited to 0-6%, preferably 0-4%, and more preferably 0-2%. In some embodiments, RO is preferably absent.

[0065] In some embodiments, controlling the ratio of RO to Nb2O5 (RO / Nb2O5) to below 0.8 helps reduce the thermal expansion coefficient of the glass and prevents degradation of the glass's weather resistance and devitrification resistance. Therefore, RO / Nb2O5 is preferably below 0.8, more preferably below 0.5, further preferably below 0.3, and even more preferably below 0.1.

[0066] In some embodiments, the ratio of the total content of B2O3, La2O3, Y2O3 and RO B2O3+La2O3+Y2O3+RO to the content of Gd2O3 (B2O3+La2O3+Y2O3+RO) / Gd2O3 is controlled within the range of 2.0 to 7.0, which can improve the weather resistance of the glass and optimize the abrasion resistance and thermal expansion coefficient of the glass. Therefore, the preferred range of (B2O3+La2O3+Y2O3+RO) / Gd2O3 is 2.0~7.0, the more preferred range of (B2O3+La2O3+Y2O3+RO) / Gd2O3 is 2.5~6.0, the further preferred range of (B2O3+La2O3+Y2O3+RO) / Gd2O3 is 3.0~4.6, and the further preferred range of (B2O3+La2O3+Y2O3+RO) / Gd2O3 is 3.5~4.5.

[0067] Alkali metal oxides (Rn2O) (Rn2O is one or more of Li2O, Na2O, and K2O) can lower the glass transition temperature, adjust the optical constants and high-temperature viscosity of the glass, and improve the glass's meltability. However, high Rn2O content can reduce the glass's devitrification resistance and chemical stability. Therefore, the Rn2O content in the present invention is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, Rn2O is preferably absent.

[0068] WO3 can increase the refractive index and mechanical strength of glass. However, if the WO3 content exceeds 5%, the thermal stability of the glass decreases and its resistance to devitrification is reduced. Therefore, the upper limit of the WO3 content is 5%, preferably 3%, and more preferably 1%. In some embodiments, WO3 is further preferably not contained.

[0069] Ta2O5 increases the refractive index and improves the devitrification resistance of glass. However, if its content is too high, the thermal stability of the glass decreases, the density increases, and the optical constants become difficult to control within the desired range. Furthermore, Ta2O5 is very expensive compared to other components, and its use should be minimized for practical and cost reasons. Therefore, the Ta2O5 content in the present invention is limited to 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that Ta2O5 be absent.

[0070] Al2O3 can improve the chemical stability of glass, but when its content exceeds 5%, the glass's meltability and light transmittance deteriorate. Therefore, in the present invention, the Al2O3 content is 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that Al2O3 is not contained.

[0071] P2O5 can improve the devitrification resistance of glass, but if its content is too high, the chemical stability will decrease. Therefore, the content of P2O5 is 0-4%, preferably 0-2%, more preferably 0-1%, and even more preferably no P2O5 is contained.

[0072] GeO2 increases the refractive index and resistance to devitrification, but excessive GeO2 content can reduce the chemical stability of glass. Furthermore, GeO2 is very expensive compared to other components, so its use should be minimized for practical and cost reasons. Therefore, the GeO2 content in the present invention is limited to 0-3%, preferably 0-2%, more preferably 0-1%, and even more preferably, no GeO2 is present.

[0073] In some embodiments, the ratio of the total content of RO, GeO2, Y2O3, and Ta2O5 (RO+GeO2+Y2O3+Ta2O5) to the content of La2O3 (RO+GeO2+Y2O3+Ta2O5) / La2O3) is controlled to be below 0.3, which can optimize the bubble degree and abrasiveness of the glass and prevent the deterioration of the Young's modulus of the glass. Therefore, (RO+GeO2+Y2O3+Ta2O5) / La2O3 is preferably below 0.3, more preferably (RO+GeO2+Y2O3+Ta2O5) / La2O3 is below 0.2, further preferably (RO+GeO2+Y2O3+Ta2O5) / La2O3 is below 0.15, and even more preferably (RO+GeO2+Y2O3+Ta2O5) / La2O3 is below 0.1.

[0074] The present invention includes 0-1% of one or more of Sb2O3, SnO2, and CeO2 as a clarifier to enhance the clarification and foaming properties of the glass. The preferred clarifier content is 0-0.5%, and more preferably 0-0.2%. Due to the rational design of the component types and contents of the optical glass of the present invention, which results in excellent foaming properties, it is further preferred in some embodiments to exclude the inclusion of a clarifier. When the Sb2O3 content exceeds 1%, the clarification properties of the glass tend to decrease. Furthermore, its strong oxidizing effect promotes corrosion of the platinum or platinum alloy vessel used to melt the glass and deteriorates the forming mold. Therefore, the present invention preferably includes an Sb2O3 content of 0-1%, more preferably 0-0.5%, even more preferably 0-0.2%, and even more preferably, excludes the inclusion of Sb2O3. SnO2 can also serve as a clarifier, but when its content exceeds 1%, the glass tends to color. Furthermore, when the glass is heated, softened, and then re-molded by molding, Sn can serve as a starting point for crystal nucleation, leading to devitrification. Therefore, the content of SnO2 in the present invention is preferably 0-1%, more preferably 0-0.5%, further preferably 0-0.2%, and further preferably no SnO2 is contained. The role and content ratio of CeO2 are the same as those of SnO2, and its content is preferably 0-1%, more preferably 0-0.5%, further preferably 0-0.2%, and further preferably no CeO2 is contained.

[0075] <Components that should not be contained>

[0076] 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 alone or in combination in small amounts, the glass will be colored and absorb specific wavelengths in the visible light region, thereby weakening the property of the present invention of improving visible light transmittance. Therefore, it is preferably substantially free of such oxides, especially in optical glasses requiring transmittance at wavelengths in the visible light region.

[0077] Oxides of Th, Cd, Tl, Os, Be, and Se have been increasingly regulated as hazardous chemicals in recent years, necessitating environmental protection measures not only during glass manufacturing but also during processing and post-product disposal. Therefore, given the importance of environmental impact, it is preferable to virtually eliminate these oxides, except where they are unavoidably incorporated. This results in optical glass being virtually free of environmentally polluting substances. Therefore, even without adopting specific environmental countermeasures, the optical glass of the present invention can be manufactured, processed, and disposed of.

[0078] In order to achieve environmental friendliness, the optical glass of the present invention preferably does not contain As2O3 and PbO.

[0079] The "does not contain" and "0%" recorded herein means that the compound, molecule or element is not intentionally added as a raw material to the optical glass of the present invention; however, as raw materials and / or equipment for producing optical glass, there may be certain impurities or components that are not intentionally added, which may be contained in small amounts or trace amounts in the final optical glass. This situation is also within the scope of protection of the patent of this invention.

[0080] Next, the properties of the optical glass of the present invention will be described.

[0081] <Refractive Index and Abbe Number>

[0082] The refractive index of optical glass (n d ) and Abbe number (ν d ) Tested in accordance with the method specified in GB / T 7962.1-2010.

[0083] In some embodiments, the refractive index (n d ) has a lower limit of 1.98, a preferred lower limit of 1.99, a more preferred lower limit of 2.00, a further preferred lower limit of 2.01, and a further preferred lower limit of 2.03.

[0084] In some embodiments, the refractive index (n d ) is 2.15, preferably 2.10, and more preferably 2.07.

[0085] In some embodiments, the Abbe number (ν d ) is 22, preferably 23, more preferably 24, and further preferably 25.

[0086] In some embodiments, the Abbe number (ν d ) has an upper limit of 31, a preferred upper limit of 30, a more preferred upper limit of 29, and a further preferred upper limit of 28.

[0087] <Coefficient of Thermal Expansion>

[0088] Thermal expansion coefficient of optical glass (α -30 / 70℃ ) The data at -30~70℃ was tested according to the method specified in GB / T7962.16-2010.

[0089] In some embodiments, the thermal expansion coefficient (α -30 / 70℃ ) is 90×10 -7 / K or less, preferably 80×10 -7 / K or less, more preferably 75×10 -7 / K or less.

[0090] <Acid resistance stability>

[0091] Acid resistance stability of optical glass (D A ) (Powder method) Tested in accordance with the method specified in GB / T 17129.

[0092] In some embodiments, the acid resistance stability (D A ) is 2 or more types, preferably 1 type.

[0093] <Color>

[0094] The short-wave transmission spectrum characteristics of the glass of the present invention are expressed by the coloration (λ 70 and λ5). 70 Refers to the wavelength when the glass transmittance reaches 70%. 70 The measurement is to use a glass with a thickness of 10±0.1mm and two parallel and optically polished opposite surfaces, and measure the spectral transmittance in the wavelength range from 280nm to 700nm and the wavelength at which the transmittance is 70%. The so-called spectral transmittance or transmittance is the wavelength at which the incident intensity I is perpendicular to the above surface of the glass. in Light of intensity I passes through the glass and emerges from a plane out The light of the case through I out / I in The amount expressed by λ also includes the transmittance of the glass due to surface reflection losses on the surface above. The higher the refractive index of the glass, the greater the surface reflection losses. Therefore, in high refractive index glass, λ 70 A small value of means that the glass itself is less colored and the light transmittance is high.

[0095] In some embodiments, the λ of the optical glass of the present invention is 70 480nm or less, preferably λ 70 470nm or less, more preferably λ 70 Below 465nm.

[0096] In some embodiments, the optical glass of the present invention has a λ5 of 390 nm or less, preferably 380 nm or less, and more preferably 375 nm or less.

[0097] Weather resistance

[0098] The weather resistance (CR) test method for optical glass is as follows: Place the sample in a test chamber with a saturated water vapor environment at a relative humidity of 90%, alternating between 40 and 50°C every hour for 15 cycles. The weather resistance category is determined based on the change in turbidity before and after the sample is placed. The weather resistance classification is shown in Table 1:

[0099] Table 1.

[0100] In some embodiments, the weather resistance (CR) of the optical glass of the present invention is Class 2 or higher, preferably Class 1.

[0101] <Knoop hardness>

[0102] Knoop hardness of optical glass (H K ) Test according to the test method specified in GB / T7962.18-2010.

[0103] In some embodiments, the Knoop hardness (H K ) is 630×10 7 Pa or more, preferably 650×10 7 Pa or more, more preferably 660×10 7 Pa and above.

[0104] <Young's modulus>

[0105] Young's modulus (E) is calculated using the following formula using ultrasonic testing of its longitudinal wave velocity and shear wave velocity. G=V S 2 ρ

[0106] Where: E is Young's modulus, Pa;

[0107] G is the shear modulus, Pa;

[0108] V T is the shear wave velocity, m / s;

[0109] V S is the longitudinal wave velocity, m / s;

[0110] ρ is the density of glass, g / cm 3 .

[0111] In some embodiments, the Young's modulus (E) of the optical glass of the present invention is 11000×10 7 Pa or more, preferably 12000×10 7 Pa or more, more preferably 13000×10 7 Pa and above.

[0112] <Bubble Degree>

[0113] The bubble degree of optical glass is tested according to the method specified in GB / T7962.8-2010.

[0114] In some embodiments, the bubble degree of the optical glass of the present invention is above grade A, preferably above grade A0, and more preferably above grade A. 00 class.

[0115] <density>

[0116] The density (ρ) of optical glass is tested according to the method specified in GB / T7962.20-2010.

[0117] In some embodiments, the density (ρ) of the optical glass of the present invention is 5.50 g / cm 3 Below, preferably 5.40g / cm 3 Below, more preferably 5.30g / cm 3 the following.

[0118] <Abrasion>

[0119] Abrasiveness of optical glass (F A ) refers to the value obtained by multiplying the ratio of the wear volume of the sample to the wear volume (volume) of the standard sample (H-K9 glass) under exactly the same conditions by 100, and is expressed as follows:

[0120] F A =V / V0×100=(W / ρ) / (W0 / ρ0)×100

[0121] Where: V—volume wear of the sample being tested;

[0122] V0—volume wear of standard sample;

[0123] W—mass wear loss of the sample being tested;

[0124] W0—mass wear of standard sample;

[0125] ρ—density of the sample being measured;

[0126] ρ0—density of standard sample.

[0127] In some embodiments, the abrasiveness (F A ) is 90, preferably 100, and more preferably 110.

[0128] In some embodiments, the abrasiveness (F A ) has an upper limit of 140, a preferred upper limit of 130, and a more preferred upper limit of 123.

[0129] [Method for manufacturing optical glass]

[0130] The optical glass of the present invention is produced using conventional raw materials and processes, including but not limited to oxides, hydroxides, complex salts (such as carbonates, nitrates, sulfates, etc.), boric acid, etc., and after being prepared according to conventional methods, the prepared charge is placed in a melting furnace (such as a platinum or platinum alloy crucible) at 1200-1450°C for melting. After clarification and homogenization, a homogeneous molten glass free of bubbles and undissolved matter is obtained. The molten glass is then cast in a mold and annealed. Those skilled in the art will be able to appropriately select the raw materials, process methods, and process parameters according to actual needs.

[0131] [Glass preforms and optical components]

[0132] A glass preform can be produced from the produced optical glass using methods such as direct drop molding, grinding, or compression molding such as hot pressing. Specifically, the molten optical glass can be directly drop molded into a precision glass preform, or the glass preform can be produced through mechanical processing such as grinding and lapping. Alternatively, the glass preform can be produced by forming a preform for compression molding from the optical glass, hot pressing the preform, and then grinding the preform. It should be noted that the methods for producing the glass preform are not limited to the methods described above.

[0133] As described above, the optical glass of the present invention is useful for various optical elements and optical designs. It is particularly preferred to form a preform from the optical glass of the present invention and use the preform to perform re-hot pressing, precision stamping, etc. to produce optical elements such as lenses and prisms.

[0134] The glass preform and optical element of the present invention are both formed from the optical glass of the present invention. The glass preform and optical element of the present invention possess the excellent properties of optical glass, and they can provide various optical elements such as lenses and prisms with high optical value.

[0135] Examples of the lens include various lenses having spherical or aspherical lens surfaces, such as a concave meniscus lens, a convex meniscus lens, a biconvex lens, a biconcave lens, a plano-convex lens, and a plano-concave lens.

[0136] [Optical Instruments]

[0137] The optical elements formed by the optical glass of the present invention can be used to make optical instruments such as photographic equipment, video equipment, projection equipment, display equipment, vehicle-mounted equipment and monitoring equipment.

[0138] Example

[0139] <Optical Glass Example>

[0140] In order to further clearly illustrate and describe the technical solutions of the present invention, the following non-limiting examples are provided.

[0141] This embodiment uses the above-mentioned optical glass manufacturing method to obtain optical glasses having the compositions shown in Tables 2 to 4. In addition, the properties of each glass were measured using the testing method described in the present invention, and the measurement results are shown in Tables 2 to 4.

[0142] Table 2.

[0143] Table 3.

[0144] Table 4.

[0145] <Glass Preform Example>

[0146] The glass obtained from optical glass examples 1 to 24# is used to make preforms of various lenses, prisms, etc., such as concave meniscus lenses, convex meniscus lenses, double convex lenses, double concave lenses, plano-convex lenses, and plano-concave lenses, by means of, for example, grinding processing, or molding methods such as re-hot pressing, precision stamping, etc.

[0147] <Optical Element Example>

[0148] The preforms obtained from the above-mentioned glass preform embodiments are annealed to reduce the internal stress of the glass and fine-tune the refractive index so that the optical properties such as the refractive index reach the desired values.

[0149] Each preform is then ground and polished to produce various lenses and prisms, including concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. The surfaces of the resulting optical elements can also be coated with an anti-reflection film.

[0150] <Optical Instrument Example>

[0151] The optical elements made from the above-mentioned optical element embodiments are optically designed and formed into optical components or optical assemblies using one or more optical elements, which can be used in, for example, imaging equipment, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / lighting in the automotive field, photolithography technology, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips.

Claims

1. Optical glass, characterized in that: Its components, expressed in weight percentage, include: SiO2+B2O3: 3-18%; La2O3+Y2O3+Gd2O3: 45-65%; ZrO2: 3-13%; Nb2O5: 3-15%; TiO2: 8-22%, wherein (La2O3+Gd2O3) / Nb2O5 is 3.5-15.

0.

2. The optical glass according to claim 1, characterized in that: Its components are expressed in weight percentage and further contain: ZnO: 0-5%; and / or RO: 0-6%; and / or Rn2O: 0-5%; and / or WO3: 0-5%; and / or Ta2O5: 0-5%; and / or Al2O3: 0-5%; and / or Yb2O3: 0-8%; and / or GeO2: 0-3%; and / or P2O5: 0-4%; and / or clarifier: 0-1%, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

3. Optical glass, characterized in that: Contains ZrO2, Nb2O5, and TiO2 as essential components, and the components, expressed in weight percentage, contain 3 to 18% of SiO2+B2O3 and 45 to 65% of La2O3+Y2O3+Gd2O3, wherein (La2O3+Gd2O3) / Nb2O5 is 3.5 to 15.0, and the refractive index of the optical glass is n d is 1.98 or more, the Abbe number ν d The thermal expansion coefficient is 22 to 31. -30 / 70℃ 90×10 -7 / K or less.

4. The optical glass according to claim 3, characterized in that: Its components, expressed in weight percentage, also contain: ZrO2: 3-13%; and / or Nb2O5: 3-15%; and / or TiO2: 8-22%; and / or ZnO: 0-5%; and / or RO: 0-6%; and / or Rn2O: 0-5%; and / or WO3: 0-5%; and / or Ta2O5: 0-5%; and / or Al2O3: 0-5%; and / or Yb2O3: 0-8%; and / or GeO2: 0-3%; and / or P2O5: 0-4%; and / or clarifier: 0-1%, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, 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 are expressed in weight percentage and meet one or more of the following 15 conditions: 1) (La2O3+Gd2O3) / Nb2O5 is 4.0 to 10.0, preferably (La2O3+Gd2O3) / Nb2O5 is 5.0 to 8.0, and more preferably (La2O3+Gd2O3) / Nb2O5 is 5.5 to 6.5; 2) SiO2 / B2O3 is 0.4 to 4.0, preferably SiO2 / B2O3 is 0.5 to 3.0, more preferably SiO2 / B2O3 is 0.6 to 2.0, and further preferably SiO2 / B2O3 is 0.7 to 1.2; 3) (ZnO + Y2O3) / Gd2O3 is less than 0.8, preferably (ZnO + Y2O3) / Gd2O3 is less than 0.6, more preferably (ZnO + Y2O3) / Gd2O3 is 0.01 to 0.5, and further preferably (ZnO + Y2O3) / Gd2O3 is 0.05 to 0.3; 4) (SiO2+B2O3) / Gd2O3 is 0.3-2.5, preferably (SiO2+B2O3) / Gd2O3 is 0.4-2.0, more preferably (SiO2+B2O3) / Gd2O3 is 0.5-1.5, and further preferably (SiO2+B2O3) / Gd2O3 is 0.7-1.2; 5) ZnO / (SiO2+B2O3) is 0.8 or less, preferably ZnO / (SiO2+B2O3) is 0.6 or less, more preferably ZnO / (SiO2+B2O3) is 0.01 to 0.5, and further preferably ZnO / (SiO2+B2O3) is 0.02 to 0.3; 6) (SiO2+B2O3+La2O3) / ZrO2 is 4.0-15.0, preferably (SiO2+B2O3+La2O3) / ZrO2 is 5.0-12.0, more preferably (SiO2+B2O3+La2O3) / ZrO2 is 6.5-10.0, and further preferably (SiO2+B2O3+La2O3) / ZrO2 is 7.5-9.0; 7) B2O3 / TiO2 is 0.1 to 1.0, preferably B2O3 / TiO2 is 0.2 to 0.8, more preferably B2O3 / TiO2 is 0.2 to 0.7, and further preferably B2O3 / TiO2 is 0.3 to 0.5; 8) (Gd2O3+Nb2O5+TiO2) / (SiO2+B2O3) is 1.0 to 8.0, preferably (Gd2O3+Nb2O5+TiO2) / (SiO2+B2O3) is 1.5 to 6.0, more preferably (Gd2O3+Nb2O5+TiO2) / (SiO2+B2O3) is 2.0 to 5.0, and further preferably (Gd2O3+Nb2O5+TiO2) / (SiO2+B2O3) is 2.5 to 4.0; 9) (Gd2O3+TiO2) / (La2O3+Nb2O5) is 0.3-0.9, preferably (Gd2O3+TiO2) / (La2O3+Nb2O5) is 0.35-0.8, more preferably (Gd2O3+TiO2) / (La2O3+Nb2O5) is 0.4-0.7, and further preferably (Gd2O3+TiO2) / (La2O3+Nb2O5) is 0.45-0.6; 10) (B2O3+La2O3) / (Gd2O3+Nb2O5+TiO2) is 0.7 to 2.5, preferably (B2O3+La2O3) / (Gd2O3+Nb2O5+TiO2) is 0.8 to 2.0, more preferably (B2O3+La2O3) / (Gd2O3+Nb2O5+TiO2) is 0.9 to 1.7, and further preferably (B2O3+La2O3) / (Gd2O3+Nb2O5+TiO2) is 1.0 to 1.5; 11) (B2O3+La2O3) / (Gd2O3+SiO2) is 1.5 to 5.5, preferably (B2O3+La2O3) / (Gd2O3+SiO2) is 2.0 to 4.0, more preferably (B2O3+La2O3) / (Gd2O3+SiO2) is 2.3 to 3.3, and further preferably (B2O3+La2O3) / (Gd2O3+SiO2) is 2.5 to 3.2; 12) B2O3 / (ZrO2+Y2O3) is 0.2 to 2.5, preferably B2O3 / (ZrO2+Y2O3) is 0.4 to 2.0, more preferably B2O3 / (ZrO2+Y2O3) is 0.5 to 1.5, and further preferably B2O3 / (ZrO2+Y2O3) is 0.6 to 1.0; 13) RO / Nb2O5 is 0.8 or less, preferably RO / Nb2O5 is 0.5 or less, more preferably RO / Nb2O5 is 0.3 or less, and further preferably RO / Nb2O5 is 0.1 or less; 14) (B2O3+La2O3+Y2O3+RO) / Gd2O3 is 2.0 to 7.0, preferably (B2O3+La2O3+Y2O3+RO) / Gd2O3 is 2.5 to 6.0, more preferably (B2O3+La2O3+Y2O3+RO) / Gd2O3 is 3.0 to 4.6, and further preferably (B2O3+La2O3+Y2O3+RO) / Gd2O3 is 3.5 to 4.5; 15) (RO+GeO2+Y2O3+Ta2O5) / La2O3 is less than 0.3, preferably (RO+GeO2+Y2O3+Ta2O5) / La2O3 is less than 0.2, more preferably (RO+GeO2+Y2O3+Ta2O5) / La2O3 is less than 0.15, and further preferably (RO+GeO2+Y2O3+Ta2O5) / La2O3 is less than 0.1, wherein RO is one or more of MgO, CaO, SrO, and BaO.

6. The optical glass according to any one of claims 1 to 4, characterized in that: Its components are expressed in weight percentage, wherein: SiO2+B2O3: 5-15%, preferably SiO2+B2O3: 7-13%; and / or La2O3+Y2O3+Gd2O3: 50-63%, preferably La2O3+Y2O3+Gd2O3: 52-60%; and / or ZrO2: 4-11%, preferably ZrO2: 6-10%; and / or Nb2O5: 5-13%, preferably Nb2O5: 7-12%; and / or TiO2: 10-20%, preferably TiO2: 13-18%; and / or ZnO: 0-4%, preferably ZnO: 0.1-3%; and / or RO: 0-4%, preferably RO: 0-2%; and / or Rn2O: 0-3%, preferably Rn2O: 0-1%; and / or Or WO3: 0-3%, preferably WO3: 0-1%; and / or Ta2O5: 0-3%, preferably Ta2O5: 0-1%; and / or Al2O3: 0-3%, preferably Al2O3: 0-1%; and / or Yb2O3: 0-5%, preferably Yb2O3: 0-1%; and / or GeO2: 0-2%, preferably GeO2: 0-1%; and / or P2O5: 0-2%, preferably P2O5: 0-1%; and / or clarifier: 0-0.5%, preferably clarifier: 0-0.2%, wherein RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, 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, among which: SiO2: 1-10%, preferably SiO2: 2-8%, more preferably SiO2: 3-7%; and / or B2O3: 1-10%, preferably B2O3: 2-9%, more preferably B2O3: 4-8%; and / or La2O3: 35-50%, preferably La2O3: 37-47%, more preferably La2O3: 41-46%; and / or Y2O3: 0-6%, preferably Y2O3: 0-4%, more preferably Y2O3: 0.1-3%; and / or Gd2O3: 6-20%, preferably Gd2O3: 8-18%, more preferably Gd2O3: 11-15%.

8. The optical glass according to any one of claims 1 to 4, characterized in that: Its components do not contain WO3; and / or do not contain Ta2O5; and / or do not contain RO; and / or do not contain Rn2O; and / or do not contain P2O5; and / or do not contain Al2O3; and / or do not contain GeO2; and / or do not contain Yb2O3, and RO is one or more of MgO, CaO, SrO, and BaO, and Rn2O is one or more of Li2O, Na2O, and K2O.

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 is 1.99 or more, preferably 2.00 to 2.15, and the Abbe number v d It is 23-30, preferably 25-28.

10. The optical glass according to any one of claims 1 to 4, characterized in that: The thermal expansion coefficient of the optical glass is α -30 / 70℃ 90×10 -7 / K or less, preferably 75×10 -7 / K or less; and / or acid resistance stability D A Two or more types, preferably one type; and / or 70 480nm or less, preferably λ 70 465nm or less; and / or λ5 is 390nm or less, preferably λ5 is 375nm or less; and / or weather resistance CR is 2 or more, preferably 1; and / or Knoop hardness H K 630×10 7 Pa or more, preferably 660×10 7 Pa or more; and / or Young's modulus E is 11000×10 7 Pa or more, preferably 13000×10 7 Pa or above; and / or the bubble degree is above grade A, preferably A 00 Grade; and / or density ρ is 5.50g / cm 3 Below, preferably 5.30 g / cm 3 Below; and / or wear degree F A It is 90-140, preferably 110-123.

11. A glass preform, characterized in that: Made of the optical glass described in any one of claims 1 to 10.

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

13. An optical instrument, characterized in that Contains the optical glass according to any one of claims 1 to 10, and / or contains the optical element according to claim 12.

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