Optical glass, glass preforms, optical elements and optical instruments

Abstract

The present invention provides an optical glass containing the following components by weight: SiO2: 1-18%, B2O3: 4-18%, La2O3: 35-60%, Y2O3: 6-30%, ZrO2: 2-15%, and Nb2O5: 2-18%. By rationally designing the components, the present invention makes it possible to obtain optical glass with the expected refractive index and Abbe number at lower raw material costs.

Description

[Technical Field]

[0001] The present invention relates to optical glass, and more particularly to optical glass having a refractive index of 1.85 to 1.91 and an Abbe number of 35 to 43, as well as a glass preform, optical element and optical instrument made therefrom. [Background technology]

[0002] In recent years, with the rapid development of digitalization and high precision in optical systems, there has been a growing demand for reducing the number of optical elements, such as lenses and prisms, used in optical devices such as photographic devices like digital cameras and video cameras, and image reproduction (projection) devices like projectors and projector televisions, thereby reducing the overall weight and size of the optical system. In optical system design, high-refractive-index glass and aspherical lenses are widely used to achieve compactness, ultra-thinness, and a wide angle of view, making it easier to achieve lighter weight and higher performance while also correcting color differences. Therefore, there is a high demand for optical glass with a refractive index of 1.85 to 1.91 and an Abbe number of 35 to 43. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Chinese Patent Application Publication No. 101549954 Summary of the Invention [Problem to be solved by the invention]

[0004] In the prior art, optical glasses with a refractive index of 1.85 to 1.91 and an Abbe number of 35 to 43 contain large amounts of Ta2O5. For example, the optical glass disclosed in Patent Document 1 (China Patent Application Publication No. 101549954) with a refractive index of 1.85 to 1.91 and an Abbe number of 38 to 42 contains 10 to 25% Ta2O5. Ta2O5 is a rare metal component, and the use of Ta2O5 is extremely disadvantageous in controlling product costs. Therefore, reducing or eliminating the use of Ta2O5 in optical glasses is a goal in the development of optical glasses.

[0005] The technical problem to be solved by the present invention is to provide an optical glass that is low in raw material cost and has a refractive index of 1.85 to 1.91 and an Abbe number of 35 to 43. [Means for solving the problem]

[0006] The technical solutions adopted by the present invention to solve the technical problems are as follows. Optical glass containing the following components by weight: SiO2: 1-18%, B2O3: 4-18%, La2O3: 35-60%, Y2O3: 6-30%, ZrO2: 2-15%, Nb2O5: 2-18%.

[0007] The optical glass further contains the following components in weight percent: Ta2O5: 0-5%, and / or Gd2O3: 0-10%, and / or TiO2: 0-8%, and / or RO: 0-8%, and / or Rn2O: 0-8%, and / or WO3: 0-5%, and / or ZnO: 0-8%, and / or Al2O3: 0-8%, and / or Yb2O3: 0-8%, and / or GeO2: 0-5%, and / or a fining agent: 0-2%, where RO is one or more of MgO, CaO, SrO, and BaO, Rn2O is one or more of Li2O, Na2O, and K2O, and the fining agent is one or more of Sb2O3, SnO, SnO2, and CeO2.

[0008] Optical glass containing the following components by weight: SiO2: 1-18%, B2O3: 4-18%, La2O3: 35-60%, Y2O3: 6-30%, ZrO2: 2-15%, Nb2O5: 2-18%, Ta2O5: 0-5%, Gd2O3: 0-10%, TiO2: 0-8%, RO: 0-8%, Rn2O: 0-8%, WO3: 0-5% , ZnO: 0-8%, Al2O3: 0-8%, Yb2O3: 0-8%, GeO2: 0-5%, fining agent: 0-2%, RO is one or more of MgO, CaO, SrO, BaO, Rn2O is one or more of Li2O, Na2O, K2O, and the fining agent is one or more of Sb2O3, SnO, SnO2, CeO2.

[0009] The optical glass further contains the following components in weight percent: La2O3+Y2O3+Gd2O3 is 45 to 75%, preferably La2O3+Y2O3+Gd2O3 is 50 to 75%, more preferably La2O3+Y2O3+Gd2O3 is 55 to 70%, and even more preferably La2O3+Y2O3+Gd2O3 is 60 to 70%.

[0010] The optical glass further contains the following components in weight percent: Y2O3 / B2O3 is 0.5 to 5.0, preferably Y2O3 / B2O3 is 0.6 to 3.0, more preferably Y2O3 / B2O3 is 0.7 to 2.5, and even more preferably Y2O3 / B2O3 is 0.8 to 2.0.

[0011] Furthermore, the optical glass contains the following components in weight percent: Gd2O3 / (SiO2+B2O3) is 1.0 or less, preferably Gd2O3 / (SiO2+B2O3) is 0.6 or less, more preferably Gd2O3 / (SiO2+B2O3) is 0.5 or less, and even more preferably Gd2O3 / (SiO2+B2O3) is 0.3 or less.

[0012] The optical glass further contains the following components in weight percent: (La2O3+Y2O3) / ZrO2 is 5.0 or more, preferably (La2O3+Y2O3) / ZrO2 is 6.0 to 20.0, more preferably (La2O3+Y2O3) / ZrO2 is 7.0 to 15.0, and even more preferably (La2O3+Y2O3) / ZrO2 is 7.5 to 10.0.

[0013] Furthermore, the optical glass contains the following components in weight percent: Ta2O5 / Y2O3 is 0.8 or less, preferably Ta2O5 / Y2O3 is 0.5 or less, more preferably Ta2O5 / Y2O3 is 0.3 or less, and even more preferably Ta2O5 / Y2O3 is 0.1 or less.

[0014] The optical glass further contains the following components in weight percent: La2O3 / Nb2O5 is 2.0 to 20.0, preferably La2O3 / Nb2O5 is 3.0 to 15.0, more preferably La2O3 / Nb2O5 is 4.0 to 10.0, and even more preferably La2O3 / Nb2O5 is 4.5 to 9.0.

[0015] Furthermore, the optical glass contains the following components in weight percent: Ta2O5 / (Nb2O5+Y2O3) is 0.5 or less, preferably Ta2O5 / (Nb2O5+Y2O3) is 0.3 or less, more preferably Ta2O5 / (Nb2O5+Y2O3) is 0.2 or less, and even more preferably Ta2O5 / (Nb2O5+Y2O3) is 0.1 or less.

[0016] The optical glass further contains the following components in weight percent: (TiO2+WO3) / Y2O3 is 1.0 or less, preferably (TiO2+WO3) / Y2O3 is 0.8 or less, more preferably (TiO2+WO3) / Y2O3 is 0.6 or less, and even more preferably (TiO2+WO3) / Y2O3 is 0.3 or less.

[0017] The optical glass further contains the following components in weight percent: (Gd2O3+ZnO) / Y2O3 is 1.0 or less, preferably (Gd2O3+ZnO) / Y2O3 is 0.8 or less, more preferably (Gd2O3+ZnO) / Y2O3 is 0.5 or less, and even more preferably (Gd2O3+ZnO) / Y2O3 is 0.3 or less.

[0018] The optical glass further contains the following components in weight percent: SiO2: 3 to 15%, preferably SiO2: 4 to 10%, and / or B2O3: 5 to 15%, preferably B2O3: 7 to 13%, and / or La2O3: 38 to 56%, preferably La2O3: 41 to 54%, and / or Y2O3: 7 to 24%, preferably Y2O3: 8 to 22%, more preferably Y2O3: 11 to 22%. , and / or ZrO2: 3 to 13%, preferably ZrO2: 4 to 10%, and / or Nb2O5: 4 to 15%, preferably Nb2O5: 5 to 10%, and / or Ta2O5: 0 to 2%, preferably Ta2O5: 0 to 1%, and / or Gd2O3: 0 to 8%, preferably Gd2O3: 0 to 5%, more preferably Gd2O3: 0 to 3%, and / or TiO2: 0 to 5%, preferably Ti O2: 0-3%, and / or RO: 0-3%, preferably RO: 0-2%, and / or Rn2O: 0-3%, preferably Rn2O: 0-2%, and / or WO3: 0-3%, preferably WO3: 0-2%, and / or ZnO: 0-4%, preferably ZnO: 0-2%, and / or Al2O3: 0-4%, preferably Al2O3: 0-2%, and / or Yb2O3: 0-5%, preferably Rn2O is one or more of MgO, CaO, SrO, and BaO; Rn2O is one or more of Li2O, Na2O, and K2O; and the fining agent is one or more of Sb2O3, SnO, SnO2, and CeO2.

[0019] The optical glass further comprises components that are free of WO3, and / or free of Ta2O5, and / or free of RO, and / or free of Rn2O, and / or free of ZnO, and / or free of Al2O3, and / or free of GeO2, wherein RO is one or more of MgO, CaO, SrO, and BaO, and Rn2O is one or more of Li2O, Na2O, and K2O.

[0020] Furthermore, the optical glass contains the following components in weight percent: SiO2, B2O3, La2O3, Y2O3, ZrO2, and Nb2O5, with a total content of 86% or more, preferably SiO2, B2O3, La2O3, Y2O3, ZrO2, and Nb2O5 of 88% or more, more preferably SiO2, B2O3, La2O3, Y2O3, ZrO2, and Nb2O5 of 90% or more, and even more preferably SiO2, B2O3, La2O3, Y2O3, ZrO2, and Nb2O5 of 95% or more.

[0021] Furthermore, the refractive index n of the optical glass d is 1.85 to 1.91, preferably 1.86 to 1.90, more preferably 1.875 to 1.895, and Abbe number v d is 35 to 43, preferably 37 to 42, and more preferably 38 to 41.

[0022] Furthermore, the density ρ of the optical glass is 5.10 g / cm 3 or less, preferably 5.00 g / cm 3 or less, more preferably 4.90 g / cm 3 and / or the thermal expansion coefficient α -30 / 70℃ is 80 x 10 -7 / K or less, preferably 70 × 10 -7 / K or less, preferably 65×10 -7 / K or less, and / or water resistance stability D W is Class 2 or more, preferably Class 1, and / or acid resistance stability D A is class 2 or more, preferably class 1, and / or λ 70 is 400 nm or less, preferably λ 70 is 390 nm or less, more preferably λ 70is 385 nm or less, and / or λ5 is 360 nm or less, preferably λ5 is 350 nm or less, more preferably λ5 is 345 nm or less, and / or weather resistance CR is Class 2 or more, preferably Class 1, and / or Knoop hardness H K is 650 x 10 7 Pa or more, preferably 660 x 10 7 Pa or more, preferably 670×10 7 Pa or more, more preferably 680 × 10 7 Pa or more, and / or Young's modulus E is 11000 × 10 7 Pa~14000×10 7 Pa, preferably 11500 x 10 7 Pa~13500×10 7 Pa, more preferably 12000×10 7 Pa~13000×10 7 Pa and / or wear rate F A and / or the foaming degree is class A or higher, preferably class A0 or higher, more preferably class A. 00 It is a grade.

[0023] A glass preform manufactured from the above optical glass. An optical element manufactured from the above optical glass or the above glass preform. An optical instrument comprising the optical glass and / or the optical element. [Effects of the Invention]

[0024] The beneficial effects of the present invention are as follows: By rationally designing the components, the present invention makes it possible to obtain optical glass having the required refractive index and Abbe number at lower raw material costs. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, embodiments of the optical glass according to the present invention will be described in detail, but the present invention is not limited to the embodiments described below, and can be practiced by making appropriate modifications within the scope of the object of the present invention. Furthermore, although some omissions may be made, the gist of the present invention is not limited by repetition of the description, and hereinafter the optical glass of the present invention may also be referred to simply as glass.

[0026] [Optical glass] The range of components of the optical glass of the present invention will be explained below. In this specification, the content and total content of each component will be expressed in weight percent (wt%) unless otherwise specified. That is, the content and total content of each component will be expressed as a weight percent relative to the total weight of the glass material converted into an oxide composition. "Converted to an oxide composition" here refers to the case where the total weight of the oxide material when the oxides, complex salts, hydroxides, etc. used as raw materials for the optical glass composition of the present invention are decomposed and converted into oxides during melting is taken as 100%.

[0027] Specifically, the numerical ranges set forth herein include upper and lower limits, and the terms "greater than or equal to" and "less than or equal to" include the endpoints, and all integers and fractions subsumed within the range, but are not limited to the specific values ​​set forth when the range is limited. References herein to "and / or" are inclusive, e.g., "A and / or B" means A only, B only, or both A and B.

[0028] <Required and optional ingredients> SiO2 adjusts the optical constants, improves the chemical stability of glass, maintains a suitable viscosity for molten glass, and reduces abrasion and erosion of refractories. In the present invention, SiO2 is added at 1% or more to achieve these effects, preferably at 3% or more, and more preferably at 4% or more. If the SiO2 content is too high, the glass becomes more difficult to melt and the transition temperature rises. Therefore, in the present invention, the upper limit of the SiO2 content is 18%, preferably 15%, and more preferably 10%.

[0029] B2O3 is beneficial for improving the melting property and devitrification resistance of glass and lowering the glass transition temperature. To achieve these effects, the present invention adds 4% or more of B2O3, preferably a B2O3 content of 5% or more, and more preferably a B2O3 content of 7% or more. If the B2O3 content is too high, the chemical stability of the glass, particularly its water resistance, will deteriorate, and the refractive index and light transmittance of the glass will decrease. Therefore, the B2O3 content is set to 18% or less, preferably 15% or less, and more preferably 13% or less.

[0030] La2O3 is an effective component for increasing the refractive index of glass and has a significant effect of improving the chemical stability and devitrification resistance of glass, but if its content is less than 35%, it is difficult to achieve the desired optical constants, and if its content exceeds 60%, the tendency of the glass to devitrify increases and thermal stability deteriorates. Therefore, the La2O3 content is limited to 35 to 60%, preferably 38 to 56%, and more preferably 41 to 54%.

[0031] Y2O3 increases the refractive index and devitrification resistance of glass and can adjust the Young's modulus of glass. In the present invention, 6% or more of Y2O3 is added to achieve the above effects. If the content exceeds 30%, the chemical stability and weather resistance of the glass deteriorate. Therefore, in the present invention, the Y2O3 content is 6 to 30%, preferably 7 to 24%, more preferably 8 to 22%, and even more preferably 11 to 22%.

[0032] In some embodiments, controlling the ratio of the Y2O3 content to the B2O3 content (Y2O3 / B2O3) within a range of 0.5 to 5.0 is advantageous for achieving an appropriate Young's modulus for the glass. Therefore, Y2O3 / B2O3 is preferably 0.5 to 5.0, and more preferably 0.6 to 3.0. Furthermore, controlling Y2O3 / B2O3 within a range of 0.7 to 2.5 is advantageous for further reducing the thermal expansion coefficient of the glass and optimizing the bubble content of the glass. Therefore, Y2O3 / B2O3 is more preferably 0.7 to 2.5, and even more preferably 0.8 to 2.0.

[0033] Although Gd2O3 can increase the refractive index and chemical stability of glass, if its content exceeds 10%, the devitrification resistance and abrasion resistance of the glass deteriorate. Therefore, the Gd2O3 content is 0 to 10%, preferably 0 to 8%, more preferably 0 to 5%, and even more preferably 0 to 3%.

[0034] In some embodiments, the ratio of GdO / (SiO+B) to the total content of SiO and B is controlled to 1.0 or less, thereby reducing the density of the glass and optimizing the degree of porosity and abrasion. Therefore, preferably, GdO / (SiO+B) is 1.0 or less, more preferably, GdO / (SiO+B) is 0.6 or less, even more preferably, GdO / (SiO+B) is 0.5 or less, and even more preferably, GdO / (SiO+B) is 0.3 or less.

[0035] In some embodiments, by controlling the total content of La2O3, Y2O3, and Gd2O3 (La2O3+Y2O3+Gd2O3) to within 45 to 75%, the glass can easily achieve the desired refractive index and Abbe number, and the devitrification resistance and weather resistance of the glass can be optimized. Therefore, preferably, La2O3+Y2O3+Gd2O3 is 45 to 75%, more preferably, La2O3+Y2O3+Gd2O3 is 50 to 75%, even more preferably, La2O3+Y2O3+Gd2O3 is 55 to 70%, and even more preferably, La2O3+Y2O3+Gd2O3 is 60 to 70%.

[0036] Yb2O3 is also a component that imparts high refractive index and low dispersion to the glass, and if its content exceeds 8%, the crystallization resistance of the glass decreases. Therefore, the Yb2O3 content should be 0 to 8%, preferably 0 to 5%, more preferably 0 to 3%, and even more preferably no Yb2O3.

[0037] ZrO2 can increase the viscosity, hardness, refractive index, and chemical stability of optical glass and can also reduce the thermal expansion coefficient of glass, but if the ZrO2 content is too high, the devitrification resistance of the glass decreases, the melting difficulty increases, the melting temperature rises, inclusions occur inside the glass, and the light transmittance decreases. Therefore, in the present invention, the ZrO2 content is 2 to 15%, preferably 3 to 13%, and more preferably 4 to 10%.

[0038] In some embodiments, controlling the ratio of the total content of La2O3 and Y2O3 (La2O3 + Y2O3) to the content of ZrO2 (La2O3 + Y2O3) (La2O3 + Y2O3) / ZrO2) to 5.0 or greater facilitates obtaining the expected Young's modulus of the glass and is advantageous for reducing the density of the glass. Therefore, it is preferable that (La2O3 + Y2O3) / ZrO2 be 5.0 or greater, and more preferably that (La2O3 + Y2O3) / ZrO2 be 6.0 to 20.0. Furthermore, controlling (La2O3 + Y2O3) / ZrO2 to a range of 7.0 to 15.0 can further optimize the weather resistance and hardness of the glass. Therefore, it is more preferable that (La2O3 + Y2O3) / ZrO2 be 7.0 to 15.0, and even more preferably that (La2O3 + Y2O3) / ZrO2 be 7.5 to 10.0.

[0039] Although TiO2 can increase the refractive index of glass, if the content is too high, the dispersion coefficient will decrease significantly, the tendency to crystallize will increase, and the coloring of the glass will become obvious. Therefore, the TiO2 content is limited to 0-8%, preferably 0-5%, and more preferably 0-3%.

[0040] Ta2O5 can increase the refractive index and improve the devitrification resistance of glass, but if its content is too high, the thermal stability of the glass decreases, the density increases, and it becomes difficult to control the optical constants within the desired range. On the other hand, Ta2O5 is very expensive compared to other components, so from the perspective of practicality and cost, it is necessary to reduce its use amount as much as possible. Therefore, in the present invention, the Ta2O5 content is limited to 0 to 5%, preferably 0 to 2%, more preferably 0 to 1%, and even more preferably, Ta2O5 is not contained.

[0041] In some embodiments, the ratio of the Ta2O5 content to the Y2O3 content, Ta2O5 / Y2O3, is controlled to 0.8 or less to improve the chemical stability of the glass, ensure that the glass has an appropriate Young's modulus, and prevent a decrease in light transmittance. Therefore, Ta2O5 / Y2O3 is preferably 0.8 or less, more preferably 0.5 or less, even more preferably 0.3 or less, and even more preferably 0.1 or less.

[0042] Nb2O5 is a high-refractive, high-dispersion component that can increase the refractive index and devitrification resistance of glass and reduce the thermal expansion coefficient of glass. In order to achieve the above effects, the present invention adds 2% or more Nb2O5, with the lower limit of the Nb2O5 content being preferably 4%, more preferably 5%. If the Nb2O5 content exceeds 18%, the thermal stability and weather resistance of the glass will decrease and the light transmittance will decrease, so the upper limit of the Nb2O5 content in the present invention is 18%, preferably 15%, more preferably 10%.

[0043] In some embodiments, the ratio of the La2O3 content to the Nb2O5 content, La2O3 / Nb2O5, is controlled within the range of 2.0 to 20.0, thereby increasing the hardness of the glass, preventing a decrease in light transmittance, and ensuring that the glass has an appropriate Young's modulus. Therefore, La2O3 / Nb2O5 is preferably 2.0 to 20.0, more preferably 3.0 to 15.0, even more preferably 4.0 to 10.0, and still more preferably 4.5 to 9.0.

[0044] In some embodiments, the ratio of the Ta2O5 content to the total Nb2O5 and YO3 content (Nb2O5 + YO3), Ta2O5 / (Nb2O5 + YO3), can be controlled to 0.5 or less to enhance the chemical stability of the glass and prevent a decrease in light transmittance. Therefore, Ta2O5 / (Nb2O5 + YO3) is preferably 0.5 or less. Furthermore, by controlling Ta2O5 / (Nb2O5 + YO3) to 0.3 or less, the weather resistance of the glass can be further improved and the abrasion resistance of the glass can be optimized. Therefore, Ta2O5 / (Nb2O5 + YO3) is more preferably 0.3 or less, even more preferably 0.2 or less, and even more preferably 0.1 or less.

[0045] 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 the chemical stability of the glass, but a high RO content reduces the devitrification resistance of the glass. Therefore, the RO content is limited to 0 to 8%, preferably 0 to 3%, and more preferably 0 to 2%. In some embodiments, it is even more preferable that the glass does not contain RO.

[0046] Alkaline metal oxide RnO (RnO is one or more of LiO, NaO, and KO) can lower the glass transition temperature, adjust the optical constants and high-temperature viscosity of glass, and improve the meltability of glass, but a high RnO content reduces the devitrification resistance and chemical stability of the glass. Therefore, the RnO content in the present invention is 0 to 8%, preferably 0 to 3%, and more preferably 0 to 2%. In some embodiments, it is even more preferable that no RnO is present.

[0047] Although WO3 can increase the refractive index and mechanical strength of glass, a WO3 content exceeding 5% reduces the thermal stability and devitrification resistance of the glass. Therefore, the upper limit of the WO3 content is 5%, preferably 3%, and more preferably 2%. In some embodiments, it is even more preferable to have no WO3.

[0048] In some embodiments, the chemical stability and cellular content of the glass can be improved by controlling the ratio of the total content of TiO2 and WO3 (TiO2 + WO3) to the content of Y2O3 (TiO2 + WO3) (TiO2 + WO3) / Y2O3) to 1.0 or less. Therefore, preferably, (TiO2 + WO3) / Y2O3 is 1.0 or less, and more preferably, (TiO2 + WO3) / Y2O3 is 0.8 or less. Furthermore, by controlling (TiO2 + WO3) / Y2O3 to 0.6 or less, the abrasion resistance of the glass can be further improved and an increase in the thermal expansion coefficient of the glass can be prevented. Therefore, more preferably, (TiO2 + WO3) / Y2O3 is 0.6 or less, and even more preferably, (TiO2 + WO3) / Y2O3 is 0.3 or less.

[0049] ZnO adjusts the refractive index and dispersion of the glass, and can lower the high-temperature viscosity and transition temperature of the glass. If the ZnO content is too high, the glass becomes more difficult to mold and its crystallization resistance deteriorates. Therefore, the ZnO content is 0 to 8%, preferably 0 to 4%, and more preferably 0 to 2%. In some embodiments, it is even more preferable that no ZnO is contained.

[0050] In some embodiments, the ratio of the total content of Gd2O3 and ZnO (Gd2O3 + ZnO) to the content of Y2O3 (Gd2O3 + ZnO) (Gd2O3 + ZnO) / Y2O3) can be controlled to 1.0 or less to reduce the thermal expansion coefficient of the glass and optimize its wear resistance. Therefore, (Gd2O3 + ZnO) / Y2O3 is preferably 1.0 or less, and more preferably 0.8 or less. Furthermore, controlling (Gd2O3 + ZnO) / Y2O3 to 0.5 or less makes it easier for the glass to achieve an appropriate Young's modulus and prevents a decrease in glass hardness. Therefore, it is more preferable that (Gd2O3 + ZnO) / Y2O3 be 0.5 or less, and even more preferably 0.3 or less.

[0051] Although Al2O3 can improve the chemical stability of glass, if its content exceeds 8%, the meltability and light transmittance of the glass deteriorate. Therefore, in the present invention, the Al2O3 content is 0 to 8%, preferably 0 to 4%, and more preferably 0 to 2%. In some embodiments, it is even more preferable that Al2O3 is not contained.

[0052] Although GeO2 can increase the refractive index and devitrification resistance, if its content is too high, the chemical stability of the glass decreases. Furthermore, GeO2 is very expensive compared to other components, and from the viewpoint of practicality and cost, its use amount must be reduced as much as possible. Therefore, the GeO2 content in the present invention is limited to 0 to 5%, preferably 0 to 3%, more preferably 0 to 1%, and even more preferably, GeO2 is not included.

[0053] In the present invention, the addition of 0-2% of one or more of Sb2O3, SnO, SnO2, and CeO2 as a fining agent can enhance the fining effect of the glass and improve the glass's cellularity. The fining agent content is preferably 0-1%, and more preferably 0-0.5%. Because the types and contents of the components of the optical glass of the present invention are rationally designed and the glass has an excellent cellularity, it is even more preferable in some embodiments to not contain a fining agent. If the Sb2O3 content exceeds 2%, the glass's fining tends to decrease, and its strong oxidizing effect accelerates corrosion of platinum or platinum alloy containers for molten glass and deterioration of molding dies. Therefore, the Sb2O3 content in the present invention is preferably 0-2%, more preferably 0-1%, even more preferably 0-0.5%, and even more preferably no Sb2O3. SnO and SnO2 can also be used as fining agents, but if their content exceeds 2%, the glass's tendency to discolor increases, or when the glass is heated, softened, and reshaped by press molding or the like, Sn acts as a starting point for crystal nucleation, leading to devitrification. Therefore, the SnO2 content in the present invention is preferably 0-2%, more preferably 0-1%, even more preferably 0-0.5%, and even more preferably no SnO2 is present. The SnO content is preferably 0-2%, more preferably 0-1%, even more preferably 0-0.5%, and even more preferably no SnO is present. The function and content of CeO2 are identical to those of SnO2, and its content is preferably 0-2%, more preferably 0-1%, even more preferably 0-0.5%, and even more preferably no CeO2 is present.

[0054] In some embodiments, in order to ensure that the optical glass of the present invention has a low coefficient of thermal expansion, high hardness and porosity rating, and appropriate wear resistance and Young's modulus, the total content of SiO2, B2O3, La2O3, Y2O3, ZrO2, and Nb2O5 is preferably 86% or more, more preferably 88% or more, even more preferably 90% or more, and still more preferably 95% or more.

[0055] <Ingredients that should not be included> In the glass of the present invention, even when oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo are contained alone or in combination, even in small amounts, the glass is colored and specific wavelengths in the visible light region are absorbed, weakening the visible light transmission effect of the present invention. Therefore, it is preferable that optical glasses that require wavelength transmittance in the visible light region in particular do not actually contain these oxides. In recent years, there has been a trend toward restricting the use of oxides of Th, Cd, Tl, Os, Be, and Se as harmful chemicals, necessitating environmental protection efforts not only in the glass manufacturing process but also in the processing and disposal of finished products. Therefore, when environmental impact is a major concern, it is preferable to avoid these elements except for unavoidable contamination. This ensures that the optical glass does not contain substances that actually pollute the environment. Therefore, the optical glass of the present invention can be manufactured, processed, and disposed of without requiring special environmental measures. In consideration of the environment, the optical glass of the present invention preferably does not contain As2O3 and PbO.

[0056] The terms "not added," "not containing," and "0%" used herein mean that the component was not intentionally added as a raw material for the glass of the present invention. However, impurities or components not intentionally added as raw materials and / or equipment for producing the glass may exist in small or trace amounts in the final glass, and these are also within the scope of the patent of the present invention.

[0057] The properties of the optical glass of the present invention will be described below. <Refractive index and Abbe number> The refractive index of optical glass (n d ) and Abbe number (ν d ) has been tested in accordance with the method specified in "GB / T7962.1-2010". In some embodiments, the refractive index (n d ) has a lower limit of 1.85, preferably 1.86, and more preferably 1.875. In some embodiments, the refractive index (n d ) has an upper limit of 1.91, preferably 1.90, and more preferably 1.895. In some embodiments, the Abbe number (ν d ) has a lower limit of 35, preferably 37, and more preferably 38. In some embodiments, the Abbe number (ν d ) has an upper limit of 43, preferably 42, and more preferably 41.

[0058] <density> The density (ρ) of optical glass is tested according to the method described in "GB / T7962.20-2010". In some embodiments, the density (ρ) of the optical glass of the present invention is 5.10 g / cm 3 or less, preferably 5.00 g / cm 3 or less, more preferably 4.90 g / cm 3 The following is the result.

[0059] <Thermal expansion coefficient> The thermal expansion coefficient of optical glass (α -30 / 70℃ ) is measured at -30 to 70°C according to the method described in "GB / T7962.16-2010". In some embodiments, the thermal expansion coefficient (α -30 / 70℃) is 80 x 10 -7 / K or less, preferably 70 × 10 -7 / K or less, preferably 65×10 -7 / K or less.

[0060] <Water resistance stability> Water resistance stability of optical glass (D W ) (powder method) is tested according to the method specified in "GB / T17129". In some embodiments, the water resistance stability (D W ) is class 2 or more, preferably class 1.

[0061] <Acid resistance stability> Acid resistance stability of optical glass (D A ) (powder method) is tested according to the method specified in "GB / T17129". In some embodiments, the acid resistance stability (D A ) is class 2 or more, preferably class 1.

[0062] <Coloring degree> The short-wave transmission spectrum characteristics of the glass of the present invention are determined by the coloring degree (λ 70 and λ5). 70 λ refers to the wavelength at which the glass transmittance reaches 70%. 70 The measurement is carried out using a glass with a thickness of 10±0.1 mm having two parallel, optically polished flat surfaces, and measuring the spectral transmittance in the wavelength range from 280 nm to 700 nm, and indicates the wavelength at which the transmittance is 70%. Spectral transmittance or transmittance is the wavelength at which the intensity I is measured perpendicular to the surface of the glass. in The light is incident on the glass and passes through it with an intensity of I out When light of λ is emitted from a single plane, it is expressed as Iout / Iin, and it also includes the transmittance of the surface reflection loss at the surface of the glass. The higher the refractive index of the glass, the greater the surface reflection loss. Therefore, for high refractive index glass, λ 70 The smaller the value, the less coloring there is in the glass itself and the higher the light transmittance. In some embodiments, the λ 70 is 400 nm or less, preferably λ 70 is 390 nm or less, more preferably λ 70 is 385 nm or less. In some embodiments, the optical glass of the present invention has a λ5 of 360 nm or less, preferably a λ5 of 350 nm or less, and more preferably a λ5 of 345 nm or less.

[0063] <Weather resistance> The weather resistance (CR) test method for optical glass is as follows: the sample is placed in a test box in a saturated water vapor environment with a relative humidity of 90%, and the temperature is alternately circulated at 40-50°C every hour for 15 cycles. The weather resistance categories are classified based on the amount of turbidity change before and after leaving the sample, and the weather resistance categories are shown in Table 1.

[0064] [Table 1]

[0065] In some embodiments, the weather resistance (CR) of the optical glass of the present invention is Class 2 or higher, preferably Class 1.

[0066] <Knoop hardness> Knoop hardness of optical glass (H K ) has been tested in accordance with the test method specified in "GB / T7962.18-2010". In some embodiments, the Knoop hardness (H K ) is 650 x 10 7 Pa or more, preferably 660 x 10 7 Pa or more, preferably 670×10 7 Pa or more, more preferably 680 × 10 7 Pa or more.

[0067] <Young's modulus> Young's modulus (E) is calculated by measuring the longitudinal and shear wave velocities using ultrasound, according to the following formula:

[0068]

number

[0069] In some embodiments, the lower limit of the Young's modulus (E) of the optical glass of the present invention is 11000×10 7 Pa, preferably with a lower limit of 11500×10 7 Pa, and more preferably the lower limit is 12000×10 7 It is Pa. In some embodiments, the upper limit of the Young's modulus (E) of the optical glass of the present invention is 14000×10 7 Pa, preferably with an upper limit of 13500×10 7 Pa, and more preferably, the upper limit is 13,000×10 7 It is Pa.

[0070] <Wear Level> Optical glass wear rate (F A ) is the ratio of the wear volume of the sample to the wear volume (volume) of a standard sample (H-K9 glass) under the exact same conditions, multiplied by 100, and the formula is as follows: F A =V / V0×100=(W / ρ) / (W0 / ρ0)×100 where V is the volumetric wear volume of the sample to be measured; V0 - volumetric wear volume of the standard sample; W - mass wear of the sample to be measured; W0 - quality wear volume of the standard sample; ρ - density of the sample to be measured; ρ0 - density of the standard sample.

[0071] In some embodiments, the abrasion rate (F A ) has a lower limit of 70, preferably a lower limit of 80, and more preferably a lower limit of 85. In some embodiments, the abrasion rate (F A ) The upper limit is 120, preferably 110, and more preferably 105.

[0072] <Bubble content> The bubble content of optical glass is tested according to the method specified in "GB / T7962.8-2010". In some embodiments, the bubble content of the optical glass of the present invention is Class A or higher, preferably Class A0 or higher, more preferably Class A 00 It is a grade.

[0073] [Optical glass manufacturing method] The method for producing the optical glass of the present invention is as follows: After mixing conventional raw materials, including but not limited to oxides, hydroxides, complex salts (carbonates, nitrates, sulfates, etc.), boric acid, etc., using conventional processes, the resulting furnace material is placed in a melting furnace (platinum or platinum alloy crucible) at 1200°C to 1450°C and melted. The mixture is then refined and homogenized to obtain a homogeneous molten glass free of bubbles and undissolved materials, which is then cast into a mold and annealed. Those skilled in the art will be able to select the appropriate raw materials, production methods, and process parameters according to actual needs.

[0074] [Glass preforms and optical elements] Glass preforms can be manufactured from optical glass prepared using press molding methods such as direct drop molding, polishing, or hot press molding. That is, molten optical glass can be made into a precision glass preform by direct precision drop molding, or a glass preform can be manufactured by mechanical processing such as grinding or polishing, or a preform blank for press molding can be prepared using optical glass, and this preform blank can be hot pressed and polished to produce a glass preform. It should be noted that the means for manufacturing optical preforms are not limited to the above means.

[0075] As described above, the optical glass of the present invention is useful for various optical elements and optical designs, and it is particularly preferable to form a blank from the optical glass of the present invention and use this blank to carry out hot press molding, precision press molding, or the like to produce optical elements such as lenses and prisms.

[0076] The optical preform and optical element of the present invention are both formed from the optical glass of the present invention. The optical preform of the present invention has the excellent properties of optical glass, and the optical element of the present invention has the excellent properties of optical glass, making it possible to provide optical elements such as various lenses and prisms with high optical value.

[0077] Examples of lenses include various lenses 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, each having a spherical or aspherical lens surface.

[0078] [Optical equipment] Optical elements formed from the optical glass of the present invention can be used to manufacture optical equipment such as photographic devices, imaging devices, projection devices, display devices, in-vehicle devices, and monitoring devices. [Example]

[0079] <Optical Glass Examples> To further clearly illustrate the technical solutions of the present invention, the following non-limiting examples are provided. In the present examples, the above-described optical glass manufacturing method was used to obtain optical glasses having the components shown in Tables 2 to 4. The properties of each glass were measured using the test methods described in the present invention, and the results are shown in Tables 2 to 4.

[0080] [Table 2]

[0081] [Table 3]

[0082] [Table 4]

[0083] <Example of glass preform> The glasses obtained in Examples 1 to 24 of the optical glass are used to manufacture preforms of various lenses, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses, as well as prisms, using polishing means or press molding means such as reheat press molding and precision press molding.

[0084] <Optical element examples> These preforms obtained in the glass preform examples above are annealed to fine-tune the refractive index while reducing the stress inside the glass so that the optical properties, such as the refractive index, reach the desired values. 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.Anti-reflection coatings can also be applied to the surfaces of the resulting optical elements.

[0085] <Optical equipment example> The optical elements manufactured according to the above optical element embodiments can be used in imaging devices, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / illumination in the automotive field, photolithography technology, excimer lasers, wafers, computer chips and integrated circuits and electronic devices containing such circuits and chips, by using one or more optical elements according to optical design to form optical parts or components.

Claims

1. Optical glass containing the following components in weight percent: SiO 2 : 1-18%, B 2 O 3 : 4-18%, La 2 O 3 : 35-60%, Y 2 O 3 : 6-30%, ZrO 2 : 2-15%, Nb 2 O 5 : 2 to 18%.

2. 2. The optical glass of claim 1, further comprising the following components in weight percent: Ta 2 O 5 : 0-5%, and / or Gd 2 O 3 : 0 to 10%, and / or TiO 2 : 0-8%, and / or RO: 0-8%, and / or Rn 2 O: 0-8% and / or WO 3 : 0-5%, and / or ZnO: 0-8%, and / or Al 2 O 3 : 0 to 8%, and / or Yb 2 O 3 : 0 to 8%, and / or GeO 2 : 0-5%, and / or fining agent: 0-2%, RO is one or more of MgO, CaO, SrO, BaO, Rn 2 O is Li 2 O, Na 2 OK 2 The fining agent is one or more of Sb 2 O 3 , SnO, SnO 2 , CeO 2 It is one or more of the following.

3. Optical glass containing the following components in weight percent: SiO 2 : 1-18%, B 2 O 3 : 4-18%, La 2 O 3 : 35-60%, Y 2 O 3 : 6-30%, ZrO 2 : 2-15%, Nb 2 O 5 : 2 to 18%, Ta 2 O 5 : 0-5%, Gd 2 O 3 : 0-10%, TiO 2 : 0-8%, RO: 0-8%, Rn 2 O: 0-8%, WO 3 : 0-5%, ZnO: 0-8%, Al 2 O 3 : 0-8%, Yb 2 O 3 : 0-8%, GeO 2 : 0-5%, fining agent: 0-2%, RO is one or more of MgO, CaO, SrO, BaO, Rn 2 O is Li 2 O, Na 2 OK 2 The fining agent is one or more of Sb 2 O 3 , SnO, SnO 2 , CeO 2 It is one or more of the following.

4. 4. The optical glass according to claim 1, comprising the following components in weight percent: 2 O 3 +Y 2 O 3 +Gd 2 O 3 is 45 to 75%, preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 is 50 to 75%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 is 55 to 70%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 is 60-70%.

5. 4. The optical glass according to claim 1, comprising the following components in weight percent: 2 O 3 / B 2 O 3 is 0.5 to 5.0, preferably Y 2 O 3 / B 2 O 3 is 0.6 to 3.0, more preferably Y 2 O 3 / B 2 O 3 is 0.7 to 2.5, and more preferably Y 2 O 3 / B 2 O 3 is 0.8 to 2.

0.

6. 4. The optical glass according to claim 1, comprising the following components in weight percent: Gd 2 O 3 / (SiO 2 +B 2 O 3 ) is 1.0 or less, preferably Gd 2 O 3 / (SiO 2 +B 2 O 3 ) is 0.6 or less, preferably Gd 2 O 3 / (SiO 2 +B 2 O 3 ) is 0.5 or less, and more preferably Gd 2 O 3 / (SiO 2 +B 2 O 3 ) is less than or equal to 0.

3.

7. 4. The optical glass according to claim 1, comprising the following components in weight percent: 2 O 3 +Y 2 O 3 ) / ZrO 2 is 5.0 or more, preferably (La 2 O 3 +Y 2 O 3 ) / ZrO 2 is 6.0 to 20.0, more preferably (La 2 O 3 +Y 2 O 3 ) / ZrO 2 is 7.0 to 15.0, more preferably (La 2 O 3 +Y 2 O 3 ) / ZrO 2 is 7.5 to 10.

0.

8. 4. The optical glass according to claim 1, comprising the following components in weight percent: 2 O 5 / Y 2 O 3 is 0.8 or less, preferably Ta 2 O 5 / Y 2 O 3 is 0.5 or less, and more preferably Ta 2 O 5 / Y 2 O 3 is 0.3 or less, and more preferably Ta 2 O 5 / Y 2 O 3 is less than or equal to 0.

1.

9. 4. The optical glass according to claim 1, comprising the following components in weight percent: 2 O 3 / Nb 2 O 5 is 2.0 to 20.0, preferably La 2 O 3 / Nb 2 O 5 is 3.0 to 15.0, more preferably La 2 O 3 / Nb 2 O 5 is 4.0 to 10.0, more preferably La 2 O 3 / Nb 2 O 5 is 4.5 to 9.

0.

10. 4. The optical glass according to claim 1, comprising the following components in weight percent: 2 O 5 / (Nb 2 O 5 +Y 2 O 3 ) is 0.5 or less, preferably Ta 2 O 5 / (Nb 2 O 5 +Y 2 O 3 ) is 0.3 or less, more preferably Ta 2 O 5 / (Nb 2 O 5 +Y 2 O 3 ) is 0.2 or less, and more preferably Ta 2 O 5 / (Nb 2 O 5 +Y 2 O 3 ) is less than or equal to 0.

1.

11. 4. The optical glass according to claim 1, comprising the following components in weight percent: (TiO 2 +WO 3 ) / Y 2 O 3 is 1.0 or less, preferably (TiO 2 +WO 3 ) / Y 2 O 3 is 0.8 or less, and more preferably (TiO 2 +WO 3 ) / Y 2 O 3 is 0.6 or less, and more preferably (TiO 2 +WO 3 ) / Y 2 O 3 is less than 0.

3.

12. 4. The optical glass according to claim 1, comprising the following components in weight percent: 2 O 3 +ZnO) / Y 2 O 3 is 1.0 or less, preferably (Gd 2 O 3 +ZnO) / Y 2 O 3 is 0.8 or less, more preferably (Gd 2 O 3 +ZnO) / Y 2 O 3 is 0.5 or less, more preferably (Gd 2 O 3 +ZnO) / Y 2 O 3 is less than or equal to 0.

3.

13. 4. The optical glass according to claim 1, comprising the following components in weight percent: SiO 2 : 3 to 15%, preferably SiO 2 : 4-10%, and / or B 2 O 3 : 5 to 15%, preferably B 2 O 3 : 7-13%, and / or La 2 O 3 : 38 to 56%, preferably La 2 O 3 : 41-54%, and / or Y 2 O 3 : 7 to 24%, preferably Y 2 O 3 : 8 to 22%, more preferably Y 2 O 3 : 11 to 22%, and / or ZrO 2 : 3 to 13%, preferably ZrO 2 : 4 to 10%, and / or Nb 2 O 5 : 4 to 15%, preferably Nb 2 O 5 : 5 to 10%, and / or Ta 2 O 5 : 0 to 2%, preferably Ta 2 O 5 : 0-1%, and / or Gd 2 O 3 : 0 to 8%, preferably Gd 2 O 3 : 0 to 5%, more preferably Gd 2 O 3 : 0 to 3%, and / or TiO 2 : 0 to 5%, preferably TiO 2 : 0 to 3%, and / or RO: 0 to 3%, preferably RO: 0 to 2%, and / or Rn 2 O: 0-3%, preferably Rn 2 O: 0-2% and / or WO 3 : 0 to 3%, preferably WO 3 : 0 to 2%, and / or ZnO: 0 to 4%, preferably ZnO: 0 to 2%, and / or Al 2 O 3 : 0 to 4%, preferably Al 2 O 3 : 0 to 2%, and / or Yb 2 O 3 : 0 to 5%, preferably Yb 2 O 3 : 0 to 3%, and / or GeO 2 : 0 to 3%, preferably GeO 2 : 0 to 1%, and / or fining agent: 0 to 1%, preferably fining agent: 0 to 0.5%, RO is one or more of MgO, CaO, SrO, and BaO, Rn 2 O is Li 2 O, Na 2 OK 2 The fining agent is one or more of Sb 2 O 3 , SnO, SnO 2 , CeO 2 It is one or more of the following.

14. The component is WO 3 does not contain and / or Ta 2 O 5 does not contain and / or does not contain RO and / or Rn 2 No O and / or no ZnO and / or Al 2 O 3 and / or GeO 2 does not contain Rn, RO is one or more of MgO, CaO, SrO, BaO 2 O is Li 2 O, Na 2 OK 2 The optical glass according to any one of claims 1 to 3, wherein O is one or more of O.

15. 4. The optical glass according to claim 1, comprising the following components in % by weight: SiO 2 , B 2 O 3 , La 2 O 3 , Y 2 O 3 , ZrO 2 , Nb 2 O 5 The total content of is 86% or more, preferably SiO 2 , B 2 O 3 , La 2 O 3 , Y 2 O 3 , ZrO 2 , Nb 2 O 5 The total content of is 88% or more, more preferably SiO 2 , B 2 O 3 , La 2 O 3 , Y 2 O 3 , ZrO 2 , Nb 2 O 5 The total content of SiO is 90% or more, and more preferably SiO 2 , B 2 O 3 , La 2 O 3 , Y 2 O 3 , ZrO 2 , Nb 2 O 5 The total content is 95% or more.

16. The optical glass according to any one of claims 1 to 3: the refractive index n d is 1.85 to 1.91, preferably 1.86 to 1.90, more preferably 1.875 to 1.895, Abbe number v d is 35 to 43, preferably 37 to 42, more preferably 38 to 41.

17. The density ρ of the optical glass is 5.10 g / cm 3 or less, preferably 5.00 g / cm 3 or less, more preferably 4.90 g / cm 3 and / or the thermal expansion coefficient α -30 / 70℃ is 80 x 10 -7 / K or less, preferably 70 × 10 -7 / K or less, preferably 65×10 -7 / K or less, and / or water resistance stability D W is Class 2 or more, preferably Class 1, and / or acid resistance stability D A is class 2 or more, preferably class 1, and / or λ 70 is 400 nm or less, preferably λ 70 is 390 nm or less, more preferably λ 70 is 385 nm or less, and / or λ 5 is 360 nm or less, preferably λ 5 is 350 nm or less, more preferably λ 5 is 345 nm or less, and / or weather resistance CR is Class 2 or more, preferably Class 1, and / or Knoop hardness HK is 650 × 10 7 Pa or more, preferably 660 x 10 7 Pa or more, preferably 670×10 7 Pa or more, more preferably 680 × 10 7 Pa or more, and / or Young's modulus E is 11000 × 10 7 Pa~14000×10 7 Pa, preferably 11500 x 10 7 Pa~13500×10 7 Pa, more preferably 12000×10 7 Pa~13000×10 7 Pa and / or wear rate F A and / or the foaming degree is Class A or higher, preferably Class A. 0 Grade or above, preferably A 00 4. The optical glass according to claim 1, wherein the optical glass is of the same grade as the glass of claim 1.

18. A glass preform made from the optical glass according to any one of claims 1 to 17.

19. An optical element produced using the optical glass according to any one of claims 1 to 17, or produced using the glass preform according to claim 18.

20. An optical instrument comprising the optical glass according to any one of claims 1 to 17 and / or the optical element according to claim 19.

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