Optical glass, optical element, and optical instrument

Abstract

This invention provides an optical glass whose composition, expressed as a weight percentage, contains: SiO2: 51-68%; B2O3: 6-19%; RO: 6-25%; ZnO: 1-10%; K2O: 0.5-10%; Na2O: greater than 0 but less than or equal to 8%; Al2O3: 0-8%, wherein (SiO2+K2O) / (B2O3+Al2O3) is 2.0-10.0, and RO is the total content of BaO, SrO, CaO, and MgO. Through reasonable composition design, the optical glass of this invention has a low density while possessing the desired refractive index and Abbe number.

Description

Technical Field

[0001] This invention relates to an optical glass, and more particularly to a low-density optical glass, as well as optical elements and optical instruments made therefrom. Background Technology

[0002] In recent years, optical glasses with refractive indices of 1.50–1.56 and Abbe numbers of 60–66 have been widely used in optical imaging equipment (such as digital cameras, camera phones, surveillance cameras, and dashcams). Optical imaging equipment has two main development trends: first, the size of the equipment is becoming smaller, allowing for easier coupling with other devices; second, the image quality is becoming higher, meeting the demands of high-definition video applications. As instruments using optical systems become increasingly digital and sophisticated, the requirements for lightweight optical components such as lenses used in various optical instruments are becoming increasingly stringent. This necessitates that the optical glass used to manufacture these components have a lower density. Chinese patent CN100371277C discloses a phosphate-based optical glass with similar optical constants to the aforementioned glass, but its higher density is detrimental to the lightweight development of optical instruments. Summary of the Invention

[0003] Based on the above reasons, the technical problem to be solved by the present invention is to provide an optical glass with a refractive index of 1.50 to 1.56, an Abbe number of 60 to 66, and a low density.

[0004] The technical solution adopted by this invention to solve the technical problem is:

[0005] (1) Optical glass, the composition of which is expressed as a weight percentage, contains: SiO2: 51-68%; B2O3: 6-19%; RO: 6-25%; ZnO: 1-10%; K2O: 0.5-10%; Na2O: greater than 0 but less than or equal to 8%; Al2O3: 0-8%, wherein (SiO2+K2O) / (B2O3+Al2O3) is 2.0-10.0, and the RO is the total content of BaO, SrO, CaO and MgO.

[0006] (2) The optical glass according to (1) further comprises, by weight percentage: Bi2O3: 0-4%; and / or Li2O: 0-5%; and / or Ln2O3: 0-5%; and / or ZrO2: 0-5%; and / or TiO2: 0-2%; and / or P2O5: 0-3%; and / or Sb2O3: 0-2%; and / or SnO2: 0-1%, wherein the Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3.

[0007] (3) Optical glass, the composition of which contains SiO2, B2O3, ZnO, K2O, Na2O and alkaline earth metal oxides, the composition expressed as a weight percentage, contains 0-8% Al2O3, wherein (SiO2+K2O) / (B2O3+Al2O3) is 2.0-10.0, and the refractive index n of the optical glass is... d The Abbe number v ranges from 1.50 to 1.56. d Its value is 60-66, and its density ρ is 3.00 g / cm³. 3 the following.

[0008] (4) The optical glass according to (3) comprises, by weight percentage: SiO2: 51-68%; and / or B2O3: 6-19%; and / or RO: 6-25%; and / or ZnO: 1-10%; and / or K2O: 0.5-10%; and / or Na2O: greater than 0 but less than or equal to 8%; and / or Bi2O3: 0-4%; and / or Li2O: 0-5%; and / or Ln2O3: 0-5%; and / or ZrO2: 0-5%; and / or TiO2: 0-2%; and / or P2O5: 0-3%; and / or Sb2O3: 0-2%; and / or SnO2: 0-1%, wherein Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3, and RO is the total content of BaO, SrO, CaO, and MgO.

[0009] (5) The optical glass according to any one of (1) to (4) has a composition expressed in weight percentage, wherein: SiO2 / BaO is 3.0 to 11.0, preferably SiO2 / BaO is 3.5 to 10.0, more preferably SiO2 / BaO is 4.0 to 7.0, and even more preferably SiO2 / BaO is 4.2 to 5.5.

[0010] (6) The optical glass according to any one of (1) to (4) has its composition expressed as a weight percentage, wherein: (SiO2+K2O) / (B2O3+Al2O3) is 2.5 to 8.0, preferably (SiO2+K2O) / (B2O3+Al2O3) is 3.0 to 7.0, and more preferably (SiO2+K2O) / (B2O3+Al2O3) is 3.5 to 5.0.

[0011] (7) The optical glass according to any one of (1) to (4) has its components expressed as weight percentages, wherein: Na2O / (Na2O+K2O) is 0.05 to 0.8, preferably Na2O / (Na2O+K2O) is 0.1 to 0.6, more preferably Na2O / (Na2O+K2O) is 0.1 to 0.5, and even more preferably Na2O / (Na2O+K2O) is 0.15 to 0.35.

[0012] (8) The optical glass according to any one of (1) to (4) has its components expressed in weight percentage, wherein: BaO / Na2O is 2.0 to 20.0, preferably BaO / Na2O is 3.0 to 15.0, more preferably BaO / Na2O is 4.0 to 10.0, and even more preferably BaO / Na2O is 5.0 to 7.5.

[0013] (9) The optical glass according to any one of (1) to (4) has its components expressed in weight percentage, wherein: BaO / ZnO is 1.0 to 10.0, preferably BaO / ZnO is 1.2 to 8.0, more preferably BaO / ZnO is 1.5 to 5.0, and even more preferably BaO / ZnO is 1.8 to 3.0.

[0014] (10) The optical glass according to any one of (1) to (4) has its components expressed in weight percentage, wherein: ZnO / (Na2O+K2O) is 0.1 to 5.0, preferably ZnO / (Na2O+K2O) is 0.2 to 3.0, more preferably ZnO / (Na2O+K2O) is 0.4 to 2.0, and even more preferably ZnO / (Na2O+K2O) is 0.5 to 1.0.

[0015] (11) The optical glass according to any one of (1) to (4) has its components expressed as weight percentages, wherein: (ZnO+BaO) / (SiO2+Na2O) is 0.1 to 0.5, preferably (ZnO+BaO) / (SiO2+Na2O) is 0.15 to 0.45, more preferably (ZnO+BaO) / (SiO2+Na2O) is 0.2 to 0.4, and even more preferably (ZnO+BaO) / (SiO2+Na2O) is 0.23 to 0.37.

[0016] (12) The optical glass according to any one of (1) to (4) has its components expressed as weight percentages, wherein: ZnO / (RO+Ln2O3) is 0.05 to 1.0, preferably ZnO / (RO+Ln2O3) is 0.1 to 0.8, more preferably ZnO / (RO+Ln2O3) is 0.2 to 0.7, and even more preferably ZnO / (RO+Ln2O3) is 0.25 to 0.6, wherein Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3, and RO is the total content of BaO, SrO, CaO, and MgO.

[0017] (13) The optical glass according to any one of (1) to (4) has its components expressed in weight percentage, wherein: Ln2O3 / BaO is 0.5 or less, preferably Ln2O3 / BaO is 0.3 or less, more preferably Ln2O3 / BaO is 0.2 or less, and even more preferably Ln2O3 / BaO is 0.1 or less, wherein Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3.

[0018] (14) The optical glass according to any one of (1) to (4) has its composition expressed as a weight percentage, wherein: 10×Bi2O3 / BaO is 0.05 to 4.0, preferably 10×Bi2O3 / BaO is 0.1 to 3.0, more preferably 10×Bi2O3 / BaO is 0.2 to 2.0, and even more preferably 10×Bi2O3 / BaO is 0.25 to 1.0.

[0019] (15) The optical glass according to any one of (1) to (4) has the following composition expressed in weight percentage: Bi2O3 / Sb2O3 is 0.1 to 10.0, preferably Bi2O3 / Sb2O3 is 0.5 to 8.0, more preferably Bi2O3 / Sb2O3 is 1.0 to 6.0, and even more preferably Bi2O3 / Sb2O3 is 1.0 to 4.0.

[0020] (16) The optical glass according to any one of (1) to (4) has its components expressed as weight percentages, wherein: (CaO+TiO2) / B2O3 is 0.8 or less, preferably (CaO+TiO2) / B2O3 is 0.6 or less, more preferably (CaO+TiO2) / B2O3 is 0.5 or less, and even more preferably (CaO+TiO2) / B2O3 is 0.2 or less.

[0021] (17) The optical glass according to any one of (1) to (4), wherein the composition is expressed as a weight percentage, wherein: SiO2: 52-65%, preferably SiO2: 56-61%; and / or B2O3: 8-18%, preferably B2O3: 10-15%; and / or RO: 8-20%, preferably RO: 9-18%; and / or ZnO: 2-8%, preferably ZnO: 3-7%; and / or K2O: 1-8%, preferably K2O: 3-7%; and / or Na2O: 0.5-7%, preferably Na2O: 1-5%; and / or Sb2O3: greater than 0 but less than or equal to 2%, preferably Sb2O3: 0.05-1.5%, more preferably Sb2O3: 0.1-1%; and / or Bi2O3: 0.05-3%. The preferred components are Bi2O3: 0.1-1%; and / or Al2O3: 1-6%, preferably Al2O3: 2-5%; and / or Li2O: 0-3%, preferably Li2O: 0-1%; and / or Ln2O3: 0-3%, preferably Ln2O3: 0-2%; and / or ZrO2: 0-3%, preferably ZrO2: 0-2%; and / or TiO2: 0-1%, preferably TiO2: 0-0.5%; and / or P2O5: 0-1%, preferably P2O5: 0-0.5%; and / or SnO2: 0-0.5%, preferably SnO2: 0-0.2%, wherein Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3, and RO is the total content of BaO, SrO, CaO, and MgO.

[0022] (18) The optical glass according to any one of (1) to (4) has the following components expressed in weight percentage: BaO: 6-19%, preferably BaO: 8-17%, more preferably BaO: 10-15%; and / or SrO: 0-5%, preferably SrO: 0-3%, more preferably SrO: 0-1%; and / or MgO: 0-5%, preferably MgO: 0-3%, more preferably MgO: 0-1%; and / or CaO: 0-5%, preferably CaO: 0-3%, more preferably CaO: 0-1%.

[0023] (19) The optical glass according to any one of (1) to (4) is free from MgO; and / or free from SrO; and / or free from CaO; and / or free from Li2O; and / or free from TiO2; and / or free from ZrO2; and / or free from P2O5; and / or free from Ln2O3; and / or free from SnO2, wherein Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3.

[0024] (20) The refractive index n of the optical glass according to any one of (1) to (4) dThe Abbe number v is 1.50 to 1.56, preferably 1.51 to 1.55, more preferably 1.515 to 1.54. d The value is 60-66, preferably 61-65, and more preferably 62-64.

[0025] (21) The density ρ of the optical glass according to any one of (1) to (4) is 3.00 g / cm³. 3 The preferred value is 2.90 g / cm³. 3 The following is a preferred value: 2.80 g / cm³ 3 The following is a further preferred value: 2.70 g / cm³ 3 The following; and / or the coefficient of thermal expansion α 0-300℃ 45×10 -7 / K~75×10 -7 / K, preferably 50×10 -7 / K~70×10 -7 / K, more preferably 55×10 -7 / K~65×10 -7 / K, further preferably 57×10 -7 / K~62×10 -7 / K; and / or acid resistance stability D A It is classified as Class 2 or above, preferably Class 1; and / or water resistance stability D W The weather resistance (CR) is classified as Class 2 or more, preferably Class 1; and / or the weather resistance (CR) is classified as Class 2 or more, preferably Class 1; and / or the transition temperature (T) is... g The upper limit of the crystallization temperature is 570–610°C, preferably 575–605°C, more preferably 580–600°C, and even more preferably 580–595°C; and / or the upper limit of the crystallization temperature T. max Temperature is below 1050°C, preferably below 1000°C, more preferably below 950°C, and even more preferably below 900°C; and / or light transmittance τ 400-900nm ≥90.0%, preferred light transmittance τ 400-900nm ≥90.5%, more preferably light transmittance τ 400-900nm ≥91.0%, further optimized light transmittance τ 400-900nm ≥91.5%.

[0026] (22) Glass preform, made of any of the optical glass described in (1) to (21).

[0027] (23) An optical element made of the optical glass described in any one of claims 1(1) to (21), or made of the glass preform described in (22).

[0028] (24) A glass article having a blackening layer, made of any of the optical glass described in (1) to (21).

[0029] (25) For the glass article with a blackened layer according to (24), the light transmittance of the blackened layer portion of the glass article with a thickness of less than 10 mm in the 400-900 nm range is ≤3.0%, preferably ≤2.0%, more preferably ≤1.0%, and even more preferably ≤0.5%; and the light transmittance of the transparent portion of the glass article with a blackened layer in the 400-900 nm range is ≥90.0%, preferably ≥90.5%, more preferably ≥91.0%, and even more preferably ≥91.5%.

[0030] (26) An optical instrument containing any of the optical glass described in (1) to (21), and / or containing the optical element described in (23), and / or containing the glass article having a blackening layer described in (24) or (25).

[0031] The beneficial effects of the present invention are: through reasonable component design, the optical glass of the present invention has a low density while having the desired refractive index and Abbe number. Detailed Implementation

[0032] The embodiments of the present invention will now 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 present invention's objectives. Furthermore, regarding repeated descriptions, although there are appropriate omissions, this will not limit the spirit of the invention. In the following text, the optical glass of the present invention will sometimes be simply referred to as glass.

[0033] Optical Glass

[0034] The composition range of each component in the optical glass of the present invention will be described below. In the present invention, unless otherwise specified, the content of each component and the total content are all expressed as a weight percentage (wt%), that is, the weight percentage of the content of each component and the total content relative to the total amount of glass material converted into oxide composition. Here, "converted into oxide composition" means that when the oxides, complex salts, and hydroxides used as raw materials for the optical glass of the present invention decompose and transform into oxides upon melting, the total amount of such oxides is taken as 100%.

[0035] Unless otherwise specified in the specific context, the numerical ranges listed in this invention 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.

[0036] <Essential and Optional Components>

[0037] SiO2 forms the framework of glass, playing a crucial role in maintaining its chemical stability and improving its resistance to devitrification. In this invention, the above-mentioned effects are achieved by containing at least 51% SiO2, preferably at least 52%, and more preferably at least 56%. If the SiO2 content exceeds 68%, the glass meltability decreases, vitrification becomes difficult, and internal quality problems such as stone formation are easily encountered. Simultaneously, the glass transition temperature increases. Therefore, the upper limit for the SiO2 content is 68%, preferably 65%, and more preferably 61%.

[0038] B2O3 can improve the melt flow properties and devitrification resistance of glass, but when its content is too high, the chemical stability of the glass decreases and it has an adverse effect on the coefficient of thermal expansion. Therefore, the content of B2O3 in this invention is 6-19%, preferably 8-18%, and more preferably 10-15%.

[0039] Al2O3 can improve the chemical stability, mechanical strength, and weather resistance of glass. However, if its content is too high, the meltability of the glass decreases and its resistance to crystallization deteriorates. Therefore, the content of Al2O3 is 0–8%, preferably 1–6%, and more preferably 2–5%.

[0040] Alkaline earth metal oxides (RO, where RO is the total content of BaO, SrO, CaO, and MgO) can adjust the refractive index of glass, but when their content is too high, the glass's resistance to devitrification and chemical stability decrease. Therefore, the RO content is 6–25%, preferably 8–20%, and more preferably 9–18%.

[0041] BaO can increase the refractive index of glass, improve its coefficient of thermal expansion and high-temperature viscosity. However, if its content is too high, the chemical stability of the glass deteriorates. Therefore, the BaO content is limited to 6-19%, preferably 8-17%, and more preferably 10-15%.

[0042] In some embodiments, controlling the ratio of SiO2 content to BaO content (SiO2 / BaO) within the range of 3.0 to 11.0 is beneficial for the glass to obtain excellent thermal expansion coefficient and chemical stability, and optimizes the glass density. Therefore, a SiO2 / BaO ratio of 3.0 to 11.0 is preferred, a SiO2 / BaO ratio of 3.5 to 10.0 is more preferred, a SiO2 / BaO ratio of 4.0 to 7.0 is even more preferred, and a SiO2 / BaO ratio of 4.2 to 5.5 is even more preferred.

[0043] SrO can adjust the refractive index and Abbe number of glass, but if its content is too high, the chemical stability of the glass decreases, and the cost of the glass also increases rapidly. Therefore, the content of SrO is limited to 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is even more preferable that the glass does not contain SrO.

[0044] CaO helps to improve the refractive index and hardness of glass and optimize its abrasion resistance. However, if the CaO content is too high, it will lead to a decrease in the glass's resistance to crystallization. Therefore, the CaO content 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 CaO.

[0045] MgO can reduce the relative partial dispersion of glass, but if the MgO content is too high, the refractive index of the glass is difficult to meet the design requirements, and the glass's anti-crystallization performance and stability decrease. Therefore, the MgO content is limited to 0-5%, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred that the glass does not contain MgO.

[0046] K2O improves the thermal stability and melt permeability of glass, and this invention achieves these effects by containing more than 0.5% K2O. However, if the K2O content exceeds 10%, the glass's resistance to devitrification and chemical stability decrease. Therefore, the K2O content in this invention is 0.5% to 10%, preferably 1% to 8%, and more preferably 3% to 7%.

[0047] In some embodiments, controlling the ratio (SiO2+K2O) / (B2O3+Al2O3) between the total content of SiO2 and K2O (SiO2+K2O) and the total content of B2O3 and Al2O3 (B2O3+Al2O3) within the range of 2.0 to 10.0 is beneficial to improving the glass's resistance to crystallization and preventing an increase in glass density. In some embodiments, when using the optical glass of the present invention to manufacture glass products with a blackening layer, controlling (SiO2+K2O) / (B2O3+Al2O3) within the range of 2.0 to 10.0 can further optimize the blackening performance of the glass. Therefore, the preferred ratio of (SiO2+K2O) / (B2O3+Al2O3) is 2.0 to 10.0, more preferably (SiO2+K2O) / (B2O3+Al2O3) is 2.5 to 8.0, even more preferably (SiO2+K2O) / (B2O3+Al2O3) is 3.0 to 7.0, and even more preferably (SiO2+K2O) / (B2O3+Al2O3) is 3.5 to 5.0.

[0048] Na₂O improves the meltability of glass, thus enhancing the glass melting process. However, excessive Na₂O content reduces the chemical stability and weather resistance of the glass. Therefore, the Na₂O content is greater than 0 but less than or equal to 8%, preferably 0.5–7%, and more preferably 1–5%.

[0049] In some embodiments, controlling the Na2O / (Na2O+K2O) ratio within the range of 0.05 to 0.8 is beneficial for the glass to achieve excellent thermal expansion coefficient while optimizing its weather resistance. Therefore, a Na2O / (Na2O+K2O) ratio of 0.05 to 0.8 is preferred, a Na2O / (Na2O+K2O) ratio of 0.1 to 0.6 is more preferred, a Na2O / (Na2O+K2O) ratio of 0.1 to 0.5 is even more preferred, and a Na2O / (Na2O+K2O) ratio of 0.15 to 0.35 is even more preferred.

[0050] In some embodiments, controlling the ratio of BaO content to Na2O content (BaO / Na2O) within the range of 2.0 to 20.0 is beneficial for improving the chemical stability and weather resistance of the glass and optimizing the glass transition temperature. Therefore, a BaO / Na2O ratio of 2.0 to 20.0 is preferred, more preferably 3.0 to 15.0, even more preferably 4.0 to 10.0, and still more preferably 5.0 to 7.5.

[0051] ZnO can improve the melting properties of glass, lower its transition temperature and high-temperature viscosity, and facilitate the elimination of bubbles within the glass; however, excessive ZnO content can reduce the glass's resistance to devitrification and its chemical stability. Therefore, the ZnO content is 1–10%, preferably 2–8%, and more preferably 3–7%.

[0052] In some embodiments, controlling the ratio of BaO content to ZnO content (BaO / ZnO) within the range of 1.0 to 10.0 can improve the light transmittance of the glass and prevent a decrease in the transition temperature. Therefore, a BaO / ZnO ratio of 1.0 to 10.0 is preferred, a BaO / ZnO ratio of 1.2 to 8.0 is more preferred, a BaO / ZnO ratio of 1.5 to 5.0 is even more preferred, and a BaO / ZnO ratio of 1.8 to 3.0 is still preferred.

[0053] In some embodiments, controlling the ratio of ZnO content to the total content of Na2O and K2O (Na2O+K2O), ZnO / (Na2O+K2O), within the range of 0.1 to 5.0, is beneficial for the glass to achieve both excellent thermal expansion coefficient and optimized light transmittance. Therefore, a ZnO / (Na2O+K2O) ratio of 0.1 to 5.0 is preferred, more preferably 0.2 to 3.0, further preferably 0.4 to 2.0, and even more preferably 0.5 to 1.0.

[0054] In some embodiments, controlling the ratio (ZnO+BaO) / (SiO2+Na2O) between the total content of ZnO and BaO (ZnO+BaO) and the total content of SiO2 and Na2O (SiO2+Na2O) within the range of 0.1 to 0.5 is beneficial for improving the bubble content of the glass and reducing its density and coefficient of thermal expansion. In some embodiments, when using the optical glass of the present invention to manufacture glass products with a blackening layer, controlling (ZnO+BaO) / (SiO2+Na2O) within the range of 0.1 to 0.5 can also optimize the blackening performance of the glass. Therefore, the preferred ratio of (ZnO+BaO) / (SiO2+Na2O) is 0.1 to 0.5, more preferably (ZnO+BaO) / (SiO2+Na2O) is 0.15 to 0.45, even more preferably (ZnO+BaO) / (SiO2+Na2O) is 0.2 to 0.4, and even more preferably (ZnO+BaO) / (SiO2+Na2O) is 0.23 to 0.37.

[0055] Li₂O can lower the glass transition temperature, adjust the high-temperature viscosity of glass, and improve the melting properties of glass. However, a high Li₂O content is detrimental to the chemical stability and cost-effectiveness of the glass. Therefore, the Li₂O content in this invention is 5% or less, preferably 3% or less, and more preferably 1% or less. In some embodiments, it is further preferred that Li₂O is not present.

[0056] Ln2O3 (Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3) is a component that improves the refractive index and chemical stability of glass. By controlling the content of Ln2O3 to below 5%, the devitrification resistance of the glass can be prevented from decreasing. Preferably, the upper limit of the Ln2O3 content range is 3%, more preferably 2%. In some embodiments, it is further preferred that the glass does not contain Ln2O3.

[0057] In some embodiments, controlling the ratio of ZnO content to the total content of RO and Ln2O3, ZnO / (RO+Ln2O3), within the range of 0.05 to 1.0, allows the glass of the present invention to achieve the desired refractive index while possessing excellent transition temperature. Therefore, it is preferable that ZnO / (RO+Ln2O3) is 0.05 to 1.0, more preferably 0.1 to 0.8, further preferably 0.2 to 0.7, and even more preferably 0.25 to 0.6.

[0058] In some embodiments, controlling the ratio of Ln2O3 content to BaO content (Ln2O3 / BaO) to be below 0.5 can improve the weather resistance of the glass and prevent the glass's anti-crystallization properties and transition temperature from deteriorating. Therefore, it is preferable that Ln2O3 / BaO is below 0.5, more preferably below 0.3, further preferably below 0.2, and even more preferably below 0.1.

[0059] ZrO2 can improve the refractive index and chemical stability of glass, reduce its coefficient of thermal expansion, and optimize its high-temperature viscosity. However, when the ZrO2 content is too high, the glass's devitrification resistance decreases, melting difficulty increases, melting temperature rises, and inclusions and light transmittance appear within the glass. Therefore, the ZrO2 content in this invention is 0–5%, preferably 0–3%, and more preferably 0–2%. In some embodiments, it is further preferred that the glass does not contain ZrO2.

[0060] Bi₂O₃ can increase the refractive index and partial dispersion ratio of glass, which is beneficial for improving the weather resistance of glass and reducing its coefficient of thermal expansion. In some embodiments, the presence of Bi₂O₃ in the glass of the present invention can also improve its blackening properties. However, if the Bi₂O₃ content is too high, the glass's resistance to crystallization will decrease. Therefore, the Bi₂O₃ content is 0–4%, preferably 0.05–3%, and more preferably 0.1–1%.

[0061] In some embodiments, controlling the 10×Bi₂O₃ / BaO ratio within the range of 0.05 to 4.0 can optimize the coefficient of thermal expansion while achieving excellent weather resistance in the glass. In some embodiments, when using the optical glass of the present invention to manufacture glass articles with a blackening layer, controlling the 10×Bi₂O₃ / BaO ratio within the range of 0.05 to 4.0 can also optimize the blackening performance of the glass. Therefore, it is preferable that the 10×Bi₂O₃ / BaO ratio is 0.05 to 4.0, more preferably 0.1 to 3.0, even more preferably 0.2 to 2.0, and even more preferably 0.25 to 1.0.

[0062] Sb₂O₃, as a clarifying agent, can improve the clarification effect and bubble content of glass. However, when its content is too high, the glass tends to have reduced clarification performance. Simultaneously, its strong oxidizing effect promotes the corrosion of platinum or platinum alloy vessels used in glassmaking and the deterioration of the forming molds. Therefore, the Sb₂O₃ content is 0–2%. In some embodiments, by containing more than 0 but less than or equal to 2% Sb₂O₃, a lower light transmittance can be achieved after the glass blackening treatment, allowing the optical glass of this invention to be used in the manufacture of glass products with a blackened layer. Therefore, it is preferable that the Sb₂O₃ content is more than 0 but less than or equal to 2%, more preferably 0.05–1.5%, and even more preferably 0.1–1%.

[0063] In some embodiments, controlling the Bi2O3 / Sb2O3 ratio between the Bi2O3 and Sb2O3 contents within the range of 0.1 to 10.0 can prevent a deterioration in the glass's anti-crystallization properties. In some embodiments, when using the optical glass of the present invention to manufacture glass articles with a blackening layer, controlling the Bi2O3 / Sb2O3 ratio within the range of 0.1 to 10.0 can also optimize the glass's blackening properties. Therefore, a Bi2O3 / Sb2O3 ratio of 0.1 to 10.0 is preferred, more preferably 0.5 to 8.0, even more preferably 1.0 to 6.0, and still more preferably 1.0 to 4.0.

[0064] TiO2 improves the refractive index and dispersion of glass. However, if the TiO2 content is too high, the tendency of the glass to crystallize increases, and the transition temperature rises. Therefore, the TiO2 content in this invention is 0-2%, preferably 0-1%, and more preferably 0-0.5%. In some embodiments, it is further preferred that the glass does not contain TiO2.

[0065] In some embodiments, controlling the total content of CaO and TiO2, specifically the ratio of CaO+TiO2 to B2O3 (CaO+TiO2) / B2O3, to be below 0.8, can prevent a decrease in the glass's resistance to crystallization and transmittance, and prevent the glass's coefficient of thermal expansion from failing to meet design requirements. Therefore, it is preferable that (CaO+TiO2) / B2O3 is below 0.8, more preferably below 0.6, further preferably below 0.5, and even more preferably below 0.2.

[0066] P2O5 is an optional component that can improve the devitrification resistance of glass, and in particular, by keeping the P2O5 content below 3%, it can suppress the decrease in the chemical stability of the glass. Therefore, the P2O5 content is limited to 3% or less, preferably 1% or less, and more preferably 0.5% or less. In some embodiments, it is further preferred that P2O5 is not present.

[0067] SnO2, as a clarifying agent, can improve the clarification effect of glass and increase the bubble content of the glass. The SnO2 content is 0-1%, preferably 0-0.5%, and more preferably 0-0.2%. In some embodiments, it is further preferred that the glass does not contain SnO2.

[0068] <Components that should not be present>

[0069] In the glass of this 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 this invention to improve visible light transmittance. Therefore, it is preferable that the glass does not contain these oxides, especially for optical glass where transmittance in the visible light region is required.

[0070] 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 glass manufacturing but also in processing and post-product disposal. 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 optical glass becomes virtually free of pollutants. Therefore, the optical glass of this invention can be manufactured, processed, and disposed of even without special environmental countermeasures.

[0071] To achieve environmental friendliness, the optical glass of the present invention preferably does not contain As2O3 and PbO.

[0072] The terms "not containing" and "0%" as used herein mean that the compound, molecule, or element was not intentionally added to the optical glass of this invention as a raw material; 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 present in small or trace amounts in the final optical glass, and such cases are also within the scope of protection of this patent.

[0073] The performance of the optical glass of the present invention will now be described.

[0074] <Refractive Index and Abbe Number>

[0075] The refractive index (n) of optical glass d ) and Abbe number (ν d Test according to the method specified in GB / T 7962.1-2010.

[0076] In some embodiments, the refractive index (n) of the optical glass of the present invention d The lower limit is 1.50, the preferred lower limit is 1.51, and the more preferred lower limit is 1.515.

[0077] In some embodiments, the refractive index (n) of the optical glass of the present invention d The upper limit of ) is 1.56, the preferred upper limit is 1.55, and the more preferred upper limit is 1.54.

[0078] In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The lower limit is 60, the preferred lower limit is 61, and the more preferred lower limit is 62.

[0079] In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The upper limit of ) is 66, the preferred upper limit is 65, and the more preferred upper limit is 64.

[0080] <Density>

[0081] The density (ρ) of optical glass was tested according to the method specified in GB / T7962.20-2010.

[0082] In some embodiments, the density (ρ) of the optical glass of the present invention is 3.00 g / cm³. 3 The preferred value is 2.90 g / cm³. 3 The following is a preferred value: 2.80 g / cm³ 3 The following is a further preferred value: 2.70 g / cm³ 3 the following.

[0083] <Coefficient of thermal expansion>

[0084] The coefficient of thermal expansion of the glass used to manufacture anti-halo stepped glass is crucial. It needs to match the coefficient of thermal expansion of gallium arsenide material to prevent the bonded components from separating when the temperature changes, which would reduce the image resolution and sensitivity of optical instruments such as low-light night vision devices.

[0085] The coefficient of thermal expansion of optical glass (α) 0-300℃ Data from 0 to 300℃ were tested according to the method specified in GB / T7962.16-2010.

[0086] In some embodiments, the coefficient of thermal expansion (α) of the optical glass of the present invention is... 0-300℃ ) is 45×10 -7 / K~75×10 -7 / K, preferably 50×10 -7 / K~70×10 -7 / K, more preferably 55×10 -7 / K~65×10 -7 / K, further preferably 57×10 -7 / K~62×10 -7 / K.

[0087] <Stability under water resistance>

[0088] Water resistance stability of optical glass (D) W (Powder method) Tested according to the method specified in GB / T 17129.

[0089] In some embodiments, the water resistance stability (D) of the optical glass of the present invention is... W There are two or more categories, with category 1 being preferred.

[0090] <Stability under acid conditions>

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

[0092] In some embodiments, the acid resistance stability (D) of the optical glass of the present invention is... A There are two or more categories, with category 1 being preferred.

[0093] <Weather resistance>

[0094] The weather resistance (CR) test method for optical glass is as follows: The sample is placed in a test chamber with a relative humidity of 90% saturated water vapor, and the temperature is alternately cyclical every 1 hour at 40–50°C, for 15 cycles. Weather resistance is classified according to the change in turbidity before and after the sample placement. The weather resistance classification is shown in Table 1.

[0095] Table 1.

[0096]

[0097] In some embodiments, the weather resistance (CR) of the optical glass of the present invention is Class 2 or above, preferably Class 1.

[0098] <Transition Temperature>

[0099] Transition temperature of optical glass (T) g The test shall be conducted in accordance with the method specified in GB / T7962.16-2010.

[0100] In some embodiments, the transition temperature (T) of the optical glass of the present invention is... g The temperature is 570–610℃, preferably 575–605℃, more preferably 580–600℃, and even more preferably 580–595℃.

[0101] <Upper limit of crystallization temperature>

[0102] Upper limit of crystallization temperature (T) max The test method is as follows: 10×10×150mm 3 A glass sample is placed in a platinum crucible and then placed in a temperature gradient furnace at 900–1200°C for 4 hours. Afterward, the crucible is removed from the furnace and allowed to cool naturally. The glass surface and any crystals within the glass are immediately observed. The lowest temperature within the set temperature range corresponding to the area where no crystals were found is taken as the "upper limit of crystallization temperature." It should be noted that this test method is only valid for crystallization temperatures between 900 and 1200°C. If no crystals are found on the entire surface and inside the sample after holding at this temperature, the sample's upper limit of crystallization temperature can be considered to be below 900°C.

[0103] Glasses with lower upper crystallization temperatures have a reduced risk of crystallization even when molten glass flows out at lower temperatures. This reduces the risk of devitrification during glass formation from the molten state, thus minimizing the impact on the optical properties of optical components using glass. Furthermore, lower crystallization temperatures allow for lower glass forming temperatures, reducing energy consumption during glass forming and lowering manufacturing costs.

[0104] The optical glass of this invention exhibits excellent crystallization stability and a low upper limit of crystallization temperature (T). max In some embodiments, the upper limit of the crystallization temperature (T) of the optical glass of the present invention is... max The temperature is below 1050°C, preferably below 1000°C, more preferably below 950°C, and even more preferably below 900°C.

[0105] <Light transmittance>

[0106] The light transmittance of the glass was tested according to the method specified in GB / T7962.12-2010 for a 3mm thick sample.

[0107] In some embodiments, the light transmittance (τ) of the optical glass of the present invention 400-900nm Light transmittance ≥ 90.0%, preferably light transmittance (τ) 400-900nm Light transmittance ≥ 90.5%, more preferably light transmittance (τ) 400-900nm )≥91.0%, further optimized light transmittance (τ) 400-900nm ≥91.5%.

[0108] [Manufacturing methods for optical glass]

[0109] The manufacturing method of the optical glass of this invention is as follows: The glass of this invention is produced using conventional raw materials and processes, including but not limited to using oxides, hydroxides, complex salts (such as carbonates, nitrates, sulfates, etc.), boric acid, etc. as raw materials. After the raw materials are prepared according to conventional methods, the prepared furnace charge is put into a melting furnace (such as a platinum or platinum alloy crucible) at 1200-1600°C 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.

[0110] [Glass products with a blackened layer and their manufacturing method]

[0111] The glass article with a blackened layer described in this invention is a translucent glass with a blackened layer, and the glass article with a blackened layer can be 2D, 2.5D, or 3D in construction. The 2.5D or 3D construction described herein refers to a glass article with a blackened layer having a non-planar construction. "Non-planar construction" as used herein means that in a 2.5D or 3D shape, at least a portion of the glass article with a blackened layer extends outward or along an angle defined by the plane of the original, layout configuration of the 2D glass. A 2.5D or 3D glass article with a blackened layer formed of glass may have one or more protruding or curved portions. The glass article with a blackened layer of this invention can have any reasonably useful shape and thickness.

[0112] The present invention provides a method for manufacturing glass articles with a blackened layer, comprising glass molding processing, blackening treatment, and shaping treatment. The glass molding processing can be performed using methods such as direct drip molding, grinding, polishing, and / or molding to form a glass article with a specific shape, the glass article having a 2D, 2.5D, or 3D structure. The blackening treatment forms a blackened layer on the surface of the glass article through physical or chemical methods. In some embodiments, the blackening treatment involves placing the glass article in a reducing atmosphere at a certain temperature for a certain period of time. Preferably, the reducing atmosphere is hydrogen (H2) or carbon monoxide (CO), more preferably hydrogen (H2); the preferred temperature is T. g Below -10℃, a more preferred temperature is T. g -10℃~T g -200℃, with a further preferred temperature of T g -20℃~T g -100℃, with a further preferred temperature of T g -20℃~T g -60℃, with a further preferred temperature of T g -30℃~T g -50℃; the preferred blackening treatment time is 50–1000 hours, more preferably 100–800 hours, further preferably 200–700 hours, and even more preferably 300–600 hours. The shaping process involves processing a specific area of ​​the blackened glass molded body to remove the blackened layer from that area, making that specific area transparent while other areas retain the blackened layer, thus producing a glass product with a blackened layer. The size and location of the specific area can be determined according to actual needs.

[0113] The glass products with a blackening layer obtained by this invention possess the excellent properties of the optical glass of this invention.

[0114] In some embodiments, the density (ρ) of the glass article having a blackened layer according to the present invention is 3.00 g / cm³. 3 The preferred value is 2.90 g / cm³. 3 The following is a preferred value: 2.80 g / cm³ 3 The following is a further preferred value: 2.70 g / cm³ 3 Below. In some embodiments, the coefficient of thermal expansion (α) of the glass article having a blackening layer according to the present invention is... 0-300℃ ) is 45×10 -7 / K~75×10 -7 / K, preferably 50×10 -7 / K~70×10 -7 / K, more preferably 55×10 -7 / K~65×10 -7 / K, further preferably 57×10 -7 / K~62×10 -7 / K. In some embodiments, the present invention provides water resistance stability (D) of glass articles with a blackened layer. W The glass article of the present invention has two or more categories, preferably one category. In some embodiments, the glass article with the blackened layer exhibits improved acid resistance stability (D...). A The weather resistance (CR) of the glass article with the blackening layer of the present invention is of class 2 or more, preferably class 1. In some embodiments, the weather resistance (CR) of the glass article with the blackening layer of the present invention is of class 2 or more, preferably class 1. In some embodiments, the transition temperature (T) of the glass article with the blackening layer of the present invention is... g The crystallization temperature is 570–610℃, preferably 575–605℃, more preferably 580–600℃, and even more preferably 580–595℃. In some embodiments, the upper limit of the crystallization temperature (T) of the glass article having a blackening layer according to the present invention is... max The temperature is below 1050°C, preferably below 1000°C, more preferably below 950°C, and even more preferably below 900°C.

[0115] The light transmittance of the glass article with a blackened layer is tested according to the method specified in GB / T7962.12-2010. In some embodiments, the light transmittance of the blackened layer portion of the glass article with a blackened layer thickness of 10 mm or less in the 400-900 nm range is ≤3.0%, preferably ≤2.0%, more preferably ≤1.0%, and even more preferably ≤0.5%. In some embodiments, the light transmittance of the transparent portion of the glass article with a blackened layer thickness of 10 mm or less in the 400-900 nm range is ≥90.0%, preferably ≥90.5%, more preferably ≥91.0%, and even more preferably ≥91.5%. Preferably, the above thickness is 1-8 mm, more preferably 2-6 mm, and even more preferably 3-5 mm.

[0116] In some embodiments, the glass article with the blackening layer is anti-halo stepped glass.

[0117] [Glass preforms and optical components]

[0118] Glass preforms can be manufactured from the produced optical glass using methods such as direct drop forming, grinding, or hot pressing. Specifically, glass preforms can be manufactured by directly and precisely drop-forming molten optical glass into precision glass preforms, or by machining such as grinding and polishing, or by hot pressing a preform made from optical glass for compression molding followed by grinding. It should be noted that the methods for preparing glass preforms are not limited to the methods described above.

[0119] As described above, the optical glass of the present invention is useful for various optical components and optical designs. It is particularly preferred to form a preform from the optical glass of the present invention, and to use the preform for hot pressing, precision stamping, etc., to manufacture optical components such as lenses and prisms.

[0120] Both the glass preform and the optical element of the present invention are formed from the optical glass described above. The glass preform of the present invention possesses the excellent properties of optical glass; the optical element of the present invention possesses the excellent properties of optical glass, and can provide various optical elements such as lenses and prisms with high optical value.

[0121] Examples of lenses include concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, plano-concave lenses, and so on, where the lens surface is spherical or aspherical.

[0122] [Optical Instruments]

[0123] The optical elements formed by the optical glass of this invention, as well as glass products with a blackening layer, can be used to manufacture optical instruments such as photographic equipment, video equipment, projection equipment, display equipment, vehicle-mounted equipment, monitoring equipment, and low-light night vision devices.

[0124] Example

[0125] <Example of Optical Glass>

[0126] To further illustrate and explain the technical solution of the present invention, the following non-limiting embodiments are provided.

[0127] In this embodiment, optical glass with the composition shown in Tables 2 to 4 was obtained using the optical glass manufacturing method described above. Furthermore, the properties of each glass were measured using the testing method described in this invention, and the measurement results are shown in Tables 2 to 4.

[0128] Table 2.

[0129]

[0130]

[0131] Table 3.

[0132]

[0133]

[0134] Table 4.

[0135]

[0136]

[0137]

[0138] <Example of Glass Prefabricated Components>

[0139] The glass obtained from optical glass Examples 1 to 24# is used to manufacture preforms of various lenses and prisms, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses, by means of grinding, hot pressing, precision stamping, or other molding methods.

[0140] <Optical Component Examples>

[0141] Annealing these preforms obtained from the above glass preform examples reduces internal stress in the glass while fine-tuning the refractive index, so that optical properties such as the refractive index reach the desired values.

[0142] Next, the prefabricated parts are 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. Anti-reflective coatings can also be applied to the surface of the resulting optical elements.

[0143] <Examples of Optical Instruments>

[0144] The optical elements obtained from the above-described optical element embodiments can be used, through optical design, to form optical components or optical assemblies by using one or more optical elements. These components can be used in, for example, imaging devices, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / lighting in the automotive field, lithography technology, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices that include such circuits and chips.

Claims

1. Optical glass, characterized in that, Its components are expressed as a weight percentage, containing: SiO2: 51-68%; B2O3: 6-19%; RO: 10-25%; ZnO: 1-10%; K2O: 0.5-10%; Na2O: greater than 0 but less than or equal to 4.8%; Al2O3: 0-8%; Bi2O3: 0.05-4%; BaO: 10-19%, wherein (SiO2+K2O) / (B2O3+Al2O3) is 2.0-10.0, 10×Bi2O3 / BaO is 0.05-4.0, SiO2 / BaO is 3.0-6.8, and RO is the total content of BaO, SrO, CaO, and MgO.

2. The optical glass according to claim 1, characterized in that, Its components, expressed as a weight percentage, also contain: Li2O: 0–5%; and / or Ln2O3: 0–5%; and / or ZrO2: 0–5%; and / or TiO2: 0–2%; and / or P2O5: 0–3%; and / or Sb2O3: 0–2%; and / or SnO2: 0–1%, wherein the Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3.

3. Optical glass, characterized in that, Its composition includes SiO2, B2O3, ZnO, K2O, Na2O, and alkaline earth metal oxides. The composition, expressed as a weight percentage, contains 0–8% Al2O3, Na2O: greater than 0 but less than or equal to 4.8%, Bi2O3: 0.05–4%, and BaO: 10–19%. The ratio of (SiO2+K2O) / (B2O3+Al2O3) is 2.0–10.0, 10×Bi2O3 / BaO is 0.05–4.0, and SiO2 / BaO is 3.0–6.

8. The refractive index n of the optical glass is... d The Abbe number v ranges from 1.50 to 1.

56. d Its value is 60-66, and its density ρ is 3.00 g / cm³. 3 the following.

4. The optical glass according to claim 3, characterized in that, Its components, expressed as a weight percentage, contain: SiO2: 51-68%; and / or B2O3: 6-19%; and / or RO: 10-25%; and / or ZnO: 1-10%; and / or K2O: 0.5-10%; and / or Li2O: 0-5%; and / or Ln2O3: 0-5%; and / or ZrO2: 0-5%; and / or TiO2: 0-2%; and / or P2O5: 0-3%; and / or Sb2O3: 0-2%; and / or SnO2: 0-1%, wherein Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3, and RO is the total content of BaO, SrO, CaO, and MgO.

5. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which: SiO2 / BaO is 3.5 to 6.

8.

6. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which: SiO2 / BaO is 4.0 to 6.

8.

7. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which: SiO2 / BaO is 4.2 to 5.

5.

8. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which (SiO2+K2O) / (B2O3+Al2O3) is 2.5 to 8.

0.

9. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which (SiO2+K2O) / (B2O3+Al2O3) is 3.0 to 7.

0.

10. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which (SiO2+K2O) / (B2O3+Al2O3) is 3.5 to 5.

0.

11. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: Na2O / (Na2O+K2O) is 0.05 to 0.

8.

12. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: Na2O / (Na2O+K2O) is 0.1 to 0.

6.

13. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: Na2O / (Na2O+K2O) is 0.1 to 0.

5.

14. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: Na2O / (Na2O+K2O) is 0.15 to 0.

35.

15. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: BaO / Na2O is 2.4 to 20.

0.

16. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: BaO / Na2O is 3.0 to 15.

0.

17. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: BaO / Na2O is 4.0 to 10.

0.

18. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: BaO / Na2O is 5.0 to 7.

5.

19. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: BaO / ZnO is 1.0 to 10.

0.

20. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: BaO / ZnO is 1.2 to 8.

0.

21. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: BaO / ZnO is 1.5 to 5.

0.

22. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: BaO / ZnO is 1.8 to 3.

0.

23. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which ZnO / (Na2O+K2O) is 0.1 to 5.

0.

24. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which ZnO / (Na2O+K2O) is 0.2 to 3.

0.

25. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which ZnO / (Na2O+K2O) is 0.4 to 2.

0.

26. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which ZnO / (Na2O+K2O) is 0.5 to 1.

0.

27. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which (ZnO+BaO) / (SiO2+Na2O) is 0.15 to 0.

5.

28. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which (ZnO+BaO) / (SiO2+Na2O) is 0.15 to 0.

45.

29. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which (ZnO+BaO) / (SiO2+Na2O) is 0.2 to 0.

4.

30. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which (ZnO+BaO) / (SiO2+Na2O) is 0.23 to 0.

37.

31. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, wherein: ZnO / (RO+Ln2O3) is 0.05 to 1.0, and Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3, and RO is the total content of BaO, SrO, CaO, and MgO.

32. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, wherein: ZnO / (RO+Ln2O3) is 0.1 to 0.8, and Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3, and RO is the total content of BaO, SrO, CaO, and MgO.

33. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, wherein: ZnO / (RO+Ln2O3) is 0.2 to 0.7, wherein Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3, and RO is the total content of BaO, SrO, CaO, and MgO.

34. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, wherein: ZnO / (RO+Ln2O3) is 0.25 to 0.6, wherein Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3, and RO is the total content of BaO, SrO, CaO, and MgO.

35. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, wherein: Ln2O3 / BaO is less than 0.5, and the Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3.

36. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, wherein: Ln2O3 / BaO is less than 0.3, and the Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3.

37. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, wherein: Ln2O3 / BaO is less than 0.2, and the Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3.

38. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, wherein: Ln2O3 / BaO is less than 0.1, and the Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3.

39. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: 10×Bi2O3 / BaO is 0.1 to 3.

0.

40. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: 10×Bi2O3 / BaO is 0.2 to 2.

0.

41. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: 10×Bi2O3 / BaO is 0.25 to 1.

0.

42. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: Bi2O3 / Sb2O3 is 0.1 to 10.

0.

43. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: Bi2O3 / Sb2O3 is 0.5 to 8.

0.

44. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which: Bi2O3 / Sb2O3 is 1.0 to 6.

0.

45. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which: Bi2O3 / Sb2O3 is 1.0 to 4.

0.

46. ​​The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which (CaO+TiO2) / B2O3 is less than 0.

8.

47. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which (CaO+TiO2) / B2O3 is less than 0.

6.

48. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which (CaO+TiO2) / B2O3 is less than 0.

5.

49. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which (CaO+TiO2) / B2O3 is less than 0.

2.

50. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: SiO2: 52-65%; and / or B2O3: 8-18%; and / or RO: 8-20%; and / or ZnO: 2-8%; and / or K2O: 1-8%; and / or Na2O: 0.5-4.8%; and / or Sb2O3: greater than 0 but less than or equal to 2%; and / or Bi2O3: 0.05-3%; and / or Al2O3: 1-6%; and / or Li2O: 0-3%; and / or Ln2O3: 0-3%; and / or ZrO2: 0-3%; and / or TiO2: 0-1%; and / or P2O5: 0-1%; and / or SnO2: 0-0.5%, wherein Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3, and RO is the total content of BaO, SrO, CaO, and MgO.

51. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: SiO2: 56-61%; and / or B2O3: 10-15%; and / or RO: 9-18%; and / or ZnO: 3-7%; and / or K2O: 3-7%; and / or Na2O: 1-4.8%; and / or Sb2O3: 0.05-1.5%; and / or Bi2O3: 0.1-1%; and / or Al2O3: 2-5%; and / or Li2O: 0-1%; and / or Ln2O3: 0-2%; and / or ZrO2: 0-2%; and / or TiO2: 0-0.5%; and / or P2O5: 0-0.5%; and / or SnO2: 0-0.2%, wherein Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3, and RO is the total content of BaO, SrO, CaO, and MgO.

52. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, of which: Sb2O3: 0.1-1%.

53. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage. Wherein: BaO: 10-17%; and / or SrO: 0-5%; and / or MgO: 0-5%; and / or CaO: 0-5%.

54. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage. Wherein: BaO: 10-15%; and / or SrO: 0-3%; and / or MgO: 0-3%; and / or CaO: 0-3%.

55. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage, wherein: SrO: 0-1%; and / or MgO: 0-1%; and / or CaO: 0-1%.

56. The optical glass according to any one of claims 1 to 4, characterized in that, Its components do not contain MgO; and / or do not contain SrO; and / or do not contain CaO; and / or do not contain Li2O; and / or do not contain TiO2; and / or do not contain ZrO2; and / or do not contain P2O5; and / or do not contain Ln2O3; and / or do not contain SnO2, wherein Ln2O3 is one or more of La2O3, Gd2O3, and Y2O3.

57. The optical glass according to any one of claims 1 to 4, characterized in that, The refractive index n of the optical glass d The Abbe number v ranges from 1.50 to 1.

56. d It ranges from 60 to 66.

58. The optical glass according to any one of claims 1 to 4, characterized in that, The refractive index n of the optical glass d The Abbe number v is between 1.51 and 1.

55. d It ranges from 61 to 65.

59. The optical glass according to any one of claims 1 to 4, characterized in that, The refractive index n of the optical glass d The Abbe number v ranges from 1.515 to 1.

54. d It ranges from 62 to 64.

60. The optical glass according to any one of claims 1 to 4, characterized in that, The density ρ of the optical glass is 3.00 g / cm³. 3 The following; and / or the coefficient of thermal expansion α 0-300℃ 45×10 -7 / K~75×10 -7 / K; and / or acid resistance stability D A Class 2 or above; and / or water resistance stability D W Class 2 or above; and / or weather resistance CR is Class 2 or above; and / or transition temperature T g The upper limit of the crystallization temperature is 570–610℃; and / or the upper limit of the crystallization temperature T. max Temperature below 1050℃; and / or light transmittance τ 400-900nm ≥90.0%.

61. The optical glass according to any one of claims 1 to 4, characterized in that, The density ρ of the optical glass is 2.90 g / cm³. 3 The following; and / or the coefficient of thermal expansion α 0-300℃ 50×10 -7 / K~70×10 -7 / K; and / or acid resistance stability D A Class 1; and / or water resistance stability D W Class 1; and / or weather resistance CR is Class 1; and / or transition temperature T g The upper limit of the crystallization temperature is 575–605℃; and / or the upper limit of the crystallization temperature T. max Temperature below 1000℃; and / or light transmittance τ 400-900nm ≥90.5%.

62. The optical glass according to any one of claims 1 to 4, characterized in that, The density ρ of the optical glass is 2.80 g / cm³. 3 The following; and / or the coefficient of thermal expansion α 0-300℃ 55×10 -7 / K~65×10 -7 / K; and / or transition temperature T g The upper limit of the crystallization temperature is 580–600℃; and / or the upper limit of the crystallization temperature T. max Temperature below 950℃; and / or light transmittance τ 400-900nm ≥91.0%.

63. The optical glass according to any one of claims 1 to 4, characterized in that, The density ρ of the optical glass is 2.70 g / cm³. 3 The following; and / or the coefficient of thermal expansion α 0-300℃ 57×10 -7 / K~62×10 -7 / K; and / or transition temperature T g The upper limit of the crystallization temperature is 580–595℃; and / or the upper limit of the crystallization temperature T. max Temperature below 900℃; and / or light transmittance τ 400-900nm ≥91.5%.

64. A glass precast component, characterized in that, It is made of the optical glass described in any one of claims 1 to 63.

65. An optical element, characterized in that, It is made of optical glass as described in any one of claims 1 to 63, or of glass preform as described in claim 64.

66. A glass product having a blackened layer, characterized in that, It is made of the optical glass described in any one of claims 1 to 63.

67. The glass article with a blackened layer according to claim 66, characterized in that, For glass products with a blackened layer thickness of less than 10 mm, the light transmittance of the blackened layer portion in the 400-900 nm range is ≤3.0%; for glass products with a blackened layer thickness of less than 10 mm, the light transmittance of the transparent portion in the 400-900 nm range is ≥90.0%.

68. The glass article with a blackened layer according to claim 66, characterized in that, For glass products with a blackened layer thickness of less than 10 mm, the light transmittance of the blackened layer portion in the 400-900 nm range is ≤2.0%; for glass products with a blackened layer thickness of less than 10 mm, the light transmittance of the transparent portion in the 400-900 nm range is ≥90.5%.

69. The glass article with a blackened layer according to claim 66, characterized in that, For glass products with a blackened layer thickness of less than 10 mm, the light transmittance of the blackened layer portion in the 400-900 nm range is ≤1.0%; for glass products with a blackened layer thickness of less than 10 mm, the light transmittance of the transparent portion in the 400-900 nm range is ≥91.0%.

70. The glass article with a blackened layer according to claim 66, characterized in that, For glass products with a blackened layer thickness of less than 10 mm, the light transmittance of the blackened layer portion in the 400-900 nm range is ≤0.5%; for glass products with a blackened layer thickness of less than 10 mm, the light transmittance of the transparent portion in the 400-900 nm range is ≥91.5%.

71. An optical instrument, characterized in that, The product contains the optical glass according to any one of claims 1 to 63, and / or contains the optical element according to claim 65, and / or contains the glass article with a blackening layer according to any one of claims 66 to 70.

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