An optical glass, its preparation method and application

Abstract

The present invention relates to the technical field of glass, and particularly relates to an optical glass, a preparation method thereof, and an application thereof. The optical glass comprises oxide components in the following weight percentages: La2O3: 30% - 40%; Ga2O3: 15% - 25%; Nb2O5: 8% - 18%; TiO2: 5% - 10%; HfO2: 5% - 10%; Ta2O5: 5% - 10%; SiO2: 5% - 10%; BaO: 2% - 6%; RF3: 1% - 3%, where R can be one or both of La and Ga; C: 0.005% - 0.02%. The refractive index of the optical glass is ≥2.0, the internal transmittance is ≥93% @ 440 nm, and the water resistance stability is Grade 1, and it can be used in fields such as virtual reality, digital cameras, and vehicle-mounted displays.

Description

Technical Field

[0001] The present invention relates to the technical field of glass, and in particular to an optical glass, a preparation method thereof, and an application thereof. Background Art

[0002] Virtual reality uses computer technology to apply virtual information to the real world. The real environment and virtual objects are superimposed on the same picture or space in real time and coexist, giving people a sense of immersive experience and becoming the focus of the development of the information industry in recent years. The diffractive waveguide is a key component of the virtual reality system, which determines the augmented reality experience of the virtual reality system. The high refractive index glass belongs to the basic material of the diffractive waveguide. Its high refractive index can enable the system to obtain a wider field of view (FOV) and higher optical clarity, and is also conducive to the miniaturization and wearable of components.

[0003] At present, due to the component characteristics, the high refractive index glass usually contains a relatively high content of components such as TiO2, resulting in glass coloring, reducing the glass transmittance, especially the transmittance in the blue light region, thereby increasing the glass light absorption and reducing the imaging quality. Therefore, how to prepare a high refractive index glass with high transmittance has become a research hotspot in the field of optical glass. Summary of the Invention

[0004] The present invention provides an optical glass, a preparation method thereof, and an application thereof, so as to solve the problems of low refractive index and poor internal transmittance of existing optical glasses. The optical glass of the present invention has a high refractive index, can significantly improve the light transmittance of the optical glass, and can expand its application fields.

[0005] According to the first aspect of the present invention, the present invention provides an optical glass, comprising the following components in weight percentage:

[0006] La2O3: 30% - 40%;

[0007] Ga2O3: 15% - 25%;

[0008] Nb2O5: 8% - 18%;

[0009] TiO2: 5% - 10%;

[0010] HfO2: 5% - 10%;

[0011] Ta2O5: 5% - 10%;

[0012] SiO2: 5% - 10%;

[0013] BaO: 2% - 6%;

[0014] RF3: 1% - 3%, R is selected from one or two of La or Ga;

[0015] C: 0.005% - 0.02%.

[0016] Furthermore, it includes components with the following weight percentages:

[0017] La2O3: 32% - 35%;

[0018] Ga2O3: 16% - 20%;

[0019] Nb2O5: 12% - 15%;

[0020] TiO2: 6% - 8%;

[0021] HfO2: 6% - 8%;

[0022] Ta2O5: 5% - 8%;

[0023] SiO2: 5% - 7%;

[0024] BaO: 3% - 6%;

[0025] RF3: 1% - 2%, where R is selected from one or both of La or Ga;

[0026] C: 0.01% - 0.015%.

[0027] Among the components of the optical glass provided by the present invention, the SiO2 component is an important network former of the optical glass provided by the present invention, which can improve the glass-forming ability, strength, and chemical stability of the glass. In the examples of the present invention, the weight percentage of the SiO2 component is controlled to be 5% - 10%, preferably 5% - 7%, which can not only obtain a homogeneous glass body but also ensure that the glass has a high refractive index. If the weight percentage of this component is less than 5%, the glass-forming ability and chemical properties deteriorate; if the weight percentage of this component exceeds 10%, the refractive index of the glass decreases.

[0028] La2O3 is a necessary component for the optical glass to have a high refractive index. The weight percentage of this component is controlled to be 30% - 40%, preferably 32% - 35%. If the weight percentage of the La2O3 component is less than 30%, it is difficult to ensure that the refractive index of the glass ≥ 2.0. If the weight percentage of the La2O3 component exceeds 40%, it will cause the glass to crystallize and the glass-forming property to deteriorate.

[0029] Ga2O3 is a necessary component for the optical glass to have good chemical stability and a high refractive index, which can improve the water resistance and refractive index of the glass. In the present invention, the weight percentage of this component is controlled within 15% - 25%, preferably 16% - 20%. If the weight percentage of this component is less than 15%, the improvement of the water resistance of the glass is not obvious; if the weight percentage of this component exceeds 25%, it will cause the glass to crystallize and the glass-forming property to deteriorate.

[0030] Nb2O5 helps to improve the glass-forming property and refractive index of optical glass. The weight percentage of this component is controlled at 8% - 18%, preferably 12% - 15%. If the weight percentage of this component is less than 8%, the improvement of the glass refractive index is not obvious; if the weight percentage of this component exceeds 18%, it is difficult for Nb2O5 to be fully melted in the glass, and the optical uniformity of the glass becomes poor.

[0031] TiO2 is a necessary component for optical glass to have a high refractive index. The weight percentage of this component is controlled at 5% - 10%, preferably 6% - 8%. If the weight percentage of this component is less than 5%, the improvement of the glass refractive index is not obvious; if the weight percentage of this component exceeds 10%, TiO2 will significantly increase the glass coloring, resulting in a decrease in the internal transmittance.

[0032] HfO2 is a necessary component for optical glass to have a high refractive index. The weight percentage of this component is controlled at 5% - 10%, preferably 6% - 8%. If the weight percentage of the HfO2 component is less than 5%, it is difficult to ensure that the refractive index of the glass ≥ 2.0; if the weight percentage of the HfO2 component exceeds 10%, it will cause the glass to crystallize and the glass-forming property becomes poor.

[0033] Ta2O5 is a necessary component for optical glass to have excellent chemical stability. The weight percentage of this component is controlled at 5% - 10%, preferably 5% - 8%. If the weight percentage of this component is less than 5%, the improvement of the glass chemical stability is not obvious; if the weight percentage of this component exceeds 10%, Ta2O5 will cause the glass to crystallize and the glass-forming property becomes poor.

[0034] BaO is a necessary component for optical glass to have a high refractive index. The weight percentage of this component is controlled at 2% - 6%, preferably 3% - 6%. If the weight percentage of the BaO component is less than 2%, it is difficult to ensure that the refractive index of the glass ≥ 2.0; if the weight percentage of the BaO component exceeds 6%, it will cause the glass chemical stability to become poor.

[0035] The RF3 component is used as a decolorizer for optical glass. In the embodiments of the present invention, the weight percentage of this component is controlled at 1% - 3%, preferably 1% - 2%. If the weight percentage of this component is less than 1%, the coloring in the glass cannot be completely eliminated, and high-transmittance glass cannot be obtained; if the weight percentage of this component exceeds 3%, the excessive fluoride will corrode the Pt crucible, reduce the optical quality of the glass, and even cause the crucible to crack.

[0036] Component C is used as a decolorizer for optical glass. In the embodiments of the present invention, the weight percentage of this component is controlled to be 0.005% - 0.02%, preferably 0.01% - 0.015%. If the weight percentage of this component is less than 0.005%, the coloring in the glass cannot be completely eliminated, and high transmittance glass cannot be obtained; if the weight percentage of this component exceeds 0.015%, it will corrode the Pt crucible, reduce the optical quality of the glass, and even cause the crucible to crack.

[0037] In the above solution, an optical glass of the present invention selects several components such as La2O3, Ga2O3, Nb2O5, TiO2, HfO2, Ta2O5, SiO2, BaO, RF3, and C as raw materials, and special limitations are imposed on the dosages of each component, so that the components fully play their mutual synergistic effects, and the obtained optical glass has the characteristics of high refractive index, high internal transmittance, and good water resistance stability, thereby expanding its application fields.

[0038] Furthermore, the refractive index of the optical glass is ≥2.0, the internal transmittance at 440 nm is ≥93%, and the water resistance stability is better than Grade 1.

[0039] The optical glass with the above characteristics can be well applied as a lens in fields such as virtual reality systems, digital cameras, or in-vehicle displays.

[0040] According to the second aspect of the present invention, the present invention also provides a preparation method for the above optical glass, including the following steps:

[0041] (1) Weigh the corresponding raw materials according to the contents of each component of the optical glass and mix them evenly;

[0042] (2) Melt the evenly mixed raw materials at high temperature under the protection of N2, use mechanical stirring to clarify and homogenize them, and anneal them after casting and forming to obtain a high refractive index optical glass.

[0043] In the above solution, the preparation method of an optical glass of the present invention first mixes each raw material evenly, and then melts the evenly mixed raw materials at high temperature under the protection of N2, uses mechanical stirring to clarify and homogenize them, and prepares them by annealing after casting and forming. The optical glass obtained by the above solution has a high refractive index, and the optical glass component of the present invention contains a low amount of TiO2, RF3, and a very small amount of C. Using an N2 atmosphere can improve the internal transmittance of the optical glass at 440 nm.

[0044] Furthermore, the device used for the high-temperature melting includes a high-temperature atmosphere protection melting furnace, a Pt-20Rh crucible, and a Pt-30Rh stirrer.

[0045] Using a pure Pt crucible and stirrer, the high-temperature glass liquid erodes them greatly, forming a Pt flash point, resulting in poor light transmittance and optical uniformity of the glass. In the above solution, a Pt-20Rh crucible and a Pt-30Rh stirrer are used for the high-temperature melting of glass, which is beneficial to improving the light transmittance and optical uniformity of optical glass.

[0046] Further, during the high-temperature melting process, N2 with a purity of 5N is introduced into the furnace cavity, and the furnace cavity pressure is 0.11 MPa - 0.13 Mpa.

[0047] In the above solution, by limiting the gas purity and furnace cavity pressure in the furnace cavity during the high-temperature melting process, the oxygen content in the furnace cavity can be reduced, preventing ions in the glass from existing in a high-valence state.

[0048] Further, during the high-temperature melting process, a Pt-30Rh frame stirrer is used for stirring to promote the clarification and homogenization of the glass liquid. The rotation speed is 50 rpm - 80 rpm, and the stirring time is 2 h - 4 h.

[0049] In the above solution, by further limiting the type of stirrer, stirring speed, and stirring time used during the high-temperature melting process, it is beneficial to improve the efficiency of high-temperature melting.

[0050] Further, the temperature of the high-temperature melting is 1400 °C - 1450 °C, and the time is 4 h - 8 h.

[0051] In the above solution, by limiting the temperature and time of high-temperature melting within a reasonable range value, it can ensure that each raw material forms a uniform, bubble-free glass liquid that meets the forming requirements after high-temperature heating, which is beneficial to subsequent processing and forming.

[0052] Further, the forming temperature of the casting forming is 1150 °C - 1250 °C, and the preheated mold temperature is 500 °C - 560 °C.

[0053] In the above solution, by limiting the forming temperature of the casting forming and the preheated mold temperature within a reasonable range value, the casting forming efficiency can be improved.

[0054] Further, the annealing temperature is 700 °C - 730 °C, and the annealing time is 3 h - 5 h.

[0055] In the above solution, by limiting the annealing temperature and annealing time within a reasonable range value, it is beneficial to better eliminate the stress in the optical glass and improve its light transparency and mechanical strength.

[0056] According to the third aspect of the present invention, the present invention also provides the above optical glass for use as a lens in a virtual reality system, a digital camera, or an in-vehicle display.

[0057] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0058] 1. The components of the optical glass provided in the embodiments of the present invention contain relatively large amounts of heavy metal oxides La2O3, Nb2O5, HfO2, and BaO, which can increase the refractive index of the glass body and ensure that the refractive index of the glass is ≥ 2.0.

[0059] 2. The components of the optical glass provided in the embodiments of the present invention contain a certain amount of Ga2O3 and Ta2O5, which significantly improve the chemical stability of the glass, and the water resistance stability is improved from level 3 to level 1.

[0060] 3. The high refractive index glass components provided in the embodiments of the present invention contain a relatively low amount of TiO₂, RF₃, and an extremely small amount of C, and an N₂ atmosphere is used, which increases the internal transmittance of the glass at 440 nm from 88% to 93%.

[0061] 4. The optical glass provided in the embodiments of the present invention has comprehensive properties such as a refractive index above 2.0, a relatively high internal transmittance, and excellent chemical stability, and can be used in fields such as virtual reality, digital cameras, and vehicle-mounted displays. Detailed implementation manners

[0062] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0063] In the components of the glass provided in the embodiments of the present invention, SiO₂ is the basic component, and the corresponding raw material is quartz sand; La₂O₃, Ga₂O₃, Nb₂O₅, TiO₂, HfO₂, Ta₂O₅, BaO, RF₃, and C are the functional components of the glass provided in the embodiments of the present invention. These functional components can all be the respective oxides / fluorides / elemental substances themselves, the corresponding carbonates, or the corresponding nitrates. These basic components and functional components are used together to prepare the optical glass.

[0064] Example 1

[0065] This example provides an optical glass, and the weight percentage contents of its respective components are shown in Table 1 below. Its preparation method includes the following steps:

[0066] Weigh the corresponding weights of raw materials according to the glass components in Table 1, and mix these raw materials evenly to obtain a batch. Add the batch balls into a Pt-20Rh crucible, and carry out high-temperature melting at 1450 °C for 8 h under the protection of N2. The furnace chamber pressure is 0.11 MPa. Use a Pt-30Rh stirrer to mechanically stir the glass melt at a rotation speed of 80 rpm for 4 h. Adopt the casting forming method, pour the homogenized glass melt into a preheated mold. The forming temperature is 1250 °C, and the preheated mold temperature is 560 °C. The formed glass is annealed at 730 °C for 3 h, and then turn off the power supply of the annealing furnace; finally, perform performance tests on the optical glass.

[0067] Example 2

[0068] This example provides an optical glass, and the weight percentage contents of its various components are shown in Table 1 below. Its preparation method includes the following steps:

[0069] Weigh the corresponding weights of raw materials according to the glass components in Table 1, and mix these raw materials evenly to obtain a batch. Add the batch balls into a Pt-20Rh crucible, and carry out high-temperature melting at 1420 °C for 4 h under the protection of N2. The furnace chamber pressure is 0.11 MPa. Use a Pt-30Rh stirrer to mechanically stir the glass melt at a rotation speed of 60 rpm for 3 h. Adopt the casting forming method, pour the homogenized glass melt into a preheated mold. The forming temperature is 1150 °C, and the preheated mold temperature is 520 °C. The formed glass is annealed at 720 °C for 4 h, and then turn off the power supply of the annealing furnace; finally, perform performance tests on the optical glass.

[0070] Example 3

[0071] This example provides an optical glass, and the weight percentage contents of its various components are shown in Table 1 below. Its preparation method includes the following steps:

[0072] Weigh the corresponding weights of raw materials according to the glass components in Table 1, and mix these raw materials evenly to obtain a batch. Add the batch balls into a Pt-20Rh crucible, and carry out high-temperature melting at 1400 °C for 6 h under the protection of N2. The furnace chamber pressure is 0.11 MPa. Use a Pt-30Rh stirrer to mechanically stir the glass melt at a rotation speed of 50 rpm for 2 h. Adopt the casting forming method, pour the homogenized glass melt into a preheated mold. The forming temperature is 1180 °C, and the preheated mold temperature is 540 °C. The formed glass is annealed at 710 °C for 4 h, and then turn off the power supply of the annealing furnace; finally, perform performance tests on the optical glass.

[0073] Example 4

[0074] This embodiment provides an optical glass, and the weight percentage contents of its various components are shown in Table 1 below. Its preparation method includes the following steps:

[0075] Weigh the corresponding weights of raw materials according to the glass components in Table 1, and mix these raw materials evenly to obtain a batch. Add the batch balls into a Pt-20Rh crucible, and carry out high-temperature melting at 1450°C for 5 h under N2 protection. The furnace chamber pressure is 0.13 MPa. Use a Pt-30Rh stirrer to mechanically stir the glass melt at a rotation speed of 50 rpm for 3 h. Adopt a casting forming method, pour the homogenized glass melt into a preheated mold, the forming temperature is 1200°C, and the preheated mold temperature is 500°C. The formed glass is annealed at 700°C for 5 h, and then turn off the power supply of the annealing furnace; finally, perform performance tests on the optical glass.

[0076] Example 5

[0077] This embodiment provides an optical glass, and the weight percentage contents of its various components are shown in Table 1 below. Its preparation method includes the following steps:

[0078] Weigh the corresponding weights of raw materials according to the glass components in Table 1, and mix these raw materials evenly to obtain a batch. Add the batch balls into a Pt-20Rh crucible, and carry out high-temperature melting at 1430°C for 4 h under N2 protection. The furnace chamber pressure is 0.13 MPa. Use a Pt-30Rh stirrer to mechanically stir the glass melt at a rotation speed of 80 rpm for 3 h. Adopt a casting forming method, pour the homogenized glass melt into a preheated mold, the forming temperature is 1150°C, and the preheated mold temperature is 500°C. The formed glass is annealed at 700°C for 5 h, and then turn off the power supply of the annealing furnace; finally, perform performance tests on the optical glass.

[0079] Example 6

[0080] This embodiment provides an optical glass, and the weight percentage contents of its various components are shown in Table 1 below. Its preparation method includes the following steps:

[0081] Weigh the corresponding weights of raw materials according to the glass components in Table 1, and mix these raw materials evenly to obtain a batch. Add the batch balls into a Pt-20Rh crucible, and carry out high-temperature melting at 1420°C for 5 h under N2 protection. The furnace chamber pressure is 0.12 MPa. Use a Pt-30Rh stirrer to mechanically stir the glass melt at a rotation speed of 60 rpm for 4 h. Adopt a casting forming method, pour the homogenized glass melt into a preheated mold, the forming temperature is 1250°C, and the preheated mold temperature is 520°C. The formed glass is annealed at 720°C for 4 h, and then turn off the power supply of the annealing furnace; finally, perform performance tests on the optical glass.

[0082] Example 7

[0083] This example provides an optical glass, and the weight percentage contents of its various components are shown in Table 1 below. Its preparation method includes the following steps:

[0084] Weigh the corresponding weights of raw materials according to the glass components in Table 1, and mix these raw materials evenly to obtain a batch. Add the batch balls into a Pt-20Rh crucible, and carry out high-temperature melting at 1450°C for 8 h under N2 protection. The furnace chamber pressure is 0.11 MPa. Use a Pt-30Rh stirrer to mechanically stir the glass melt, with a rotation speed of 70 rpm and a stirring time of 2 h. Adopt a casting forming method, pour the homogenized glass melt into a preheated mold, with a forming temperature of 1180°C and a preheated mold temperature of 560°C. The formed glass is annealed at 710°C for 4 h, and then turn off the power supply of the annealing furnace; finally, perform performance tests on the optical glass.

[0085] Example 8

[0086] This example provides an optical glass, and the weight percentage contents of its various components are shown in Table 1 below. Its preparation method includes the following steps:

[0087] Weigh the corresponding weights of raw materials according to the glass components in Table 1, and mix these raw materials evenly to obtain a batch. Add the batch balls into a Pt-20Rh crucible, and carry out high-temperature melting at 1400°C for 6 h under N2 protection. The furnace chamber pressure is 0.11 MPa. Use a Pt-30Rh stirrer to mechanically stir the glass melt, with a rotation speed of 50 rpm and a stirring time of 2 h. Adopt a casting forming method, pour the homogenized glass melt into a preheated mold, with a forming temperature of 1200°C and a preheated mold temperature of 540°C. The formed glass is annealed at 730°C for 3 h, and then turn off the power supply of the annealing furnace; finally, perform performance tests on the optical glass.

[0088] Comparative Example 1

[0089] This comparative example provides an optical glass, and the weight percentage contents of its various components are shown in Table 2 below. Its preparation method is the same as that of Example 6.

[0090] Comparative Example 2

[0091] This comparative example provides an optical glass, and the weight percentage contents of its various components are shown in Table 2 below. Its preparation method is the same as that of Example 6.

[0092] Comparative Example 3

[0093] This comparative example provides an optical glass, and the weight percentage contents of its various components are shown in Table 2 below. Its preparation method is the same as that of Example 6.

[0094] Comparative Example 4

[0095] This comparative example provides an optical glass, and the weight percentage contents of its various components are shown in Table 2 below. Its preparation method is the same as that of Example 6, except that during the preparation of the optical glass, N2 is not introduced, and melting is carried out in an atmospheric environment.

[0096] Comparative Example 5

[0097] This comparative example provides an optical glass, and the weight percentage contents of its various components are shown in Table 2 below. Its preparation method is the same as that of Example 6.

[0098] Comparative Example 6

[0099] This comparative example provides an optical glass, and the weight percentage contents of its various components are shown in Table 2 below. Its preparation method is the same as that of Example 6, except that during the preparation of the optical glass, a pure Pt crucible and a pure Pt stirrer are used.

[0100] Comparative Examples 7 - 9

[0101] This comparative example provides an optical glass, and the weight percentage contents of its various components are shown in Table 2 below. Its preparation method is the same as that of Example 6.

[0102] The optical glasses prepared in the examples and comparative examples of the present invention were subjected to performance tests according to the following method, and the specific performance test results are shown in Table 1.

[0103] The refractive index was tested according to the method of GB / T 7962.1 - 2010 "Test Methods for Colorless Optical Glass - Part 1: Refractive Index and Abbe Number".

[0104] The internal transmittance was tested according to the method of GB / T 7962.12 - 2010 "Test Methods for Colorless Optical Glass - Part 12: Spectral Internal Transmittance".

[0105] The water resistance stability was tested according to the method of GB / T 6582 - 2021 "Test Method and Classification for the Resistance of Glass to Water at 98 °C - Granular Method".

[0106] The optical homogeneity was tested according to the method of GB / T 7962.2 - 2010 "Test Methods for Colorless Optical Glass - Part 2: Optical Homogeneity - Fizeau Plane Interference Method".

[0107] Table 1. Component and Performance Test Results of the Optical Glass in the Examples of the Present Invention

[0108]

[0109]

[0110] Table 2 Component and Performance Test Results of the Optical Glass in Example 6 and Comparative Examples of the Present Invention

[0111]

[0112] As can be seen from Table 1, the optical glass prepared in the embodiment of the present invention has comprehensive properties such as a high refractive index (≥2.0), good internal transmittance (≥93% @ 440 nm), and excellent chemical stability (Grade 1).

[0113] As can be seen from Table 2, when the content of TiO2 in the optical glass of Comparative Example 1 is relatively high, the glass coloring becomes heavier, and the internal transmittance is only 86.1%; in the optical glass of Comparative Example 2, since it does not contain LaF3 or GaF3 fluoride, Fe ions in the glass exist in the form of high-valent Fe 3+ form, the glass coloring becomes heavier, and the internal transmittance is only 72.2%; in the optical glass of Comparative Example 3, since it does not contain C, it is not conducive to forming a weak reducing atmosphere during the melting process, and Fe ions exist in the form of high-valent Fe 3+ form, the glass coloring becomes heavier, and the internal transmittance deteriorates; the melting of the optical glass of Comparative Example 4 is carried out in an atmospheric environment, and Fe ions in the glass cannot exist in the form of low-valent Fe 2+ form, resulting in a low internal transmittance of the glass; in the optical glass of Comparative Example 5, due to the low content of Ta2O5 and Ga2O3, the water resistance stability of the glass deteriorates, and the water resistance grade is 3; in the optical glass of Comparative Example 6, due to the use of a pure Pt crucible and stirrer, the high-temperature glass liquid erodes it greatly, forming Pt flash points, resulting in poor light transmittance and optical uniformity of the glass. From the comparison results of Comparative Examples 7-8 and the embodiment of the present invention, it can be seen that controlling the weight percentage content of the RF3 component within a reasonable range is beneficial to improving the overall performance of the optical glass of the present invention. If the weight percentage content of this component is less than 1%, the coloring in the glass cannot be completely eliminated, and high-transmittance glass cannot be obtained; if the weight percentage content of this component exceeds 3%, the excessive fluoride will corrode the Pt crucible, reduce the optical quality of the glass, and even cause the crucible to rupture. From the comparison results of Comparative Example 9 and the embodiment of the present invention, it can be seen that without adding the HfO2 component, it is difficult to ensure that the refractive index of the glass is ≥2.0.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical glass, characterized in that, Comprising components with the following weight percentages: La2O3: 30% - 40%; Ga2O3: 15% - 25%; Nb2O5: 8% - 18%; TiO2: 5% - 10%; HfO2: 5% - 10%; Ta2O5: 5% - 10%; SiO2: 5% - 10%; BaO: 2% - 6%; RF3: 1% - 3%, where R is selected from one or both of La and Ga; C：0.005％-0.02％； The refractive index of the optical glass is ≥2.0, the internal transmittance at 440 nm is ≥93%, and the water resistance stability is better than grade 1; The preparation method of the optical glass comprises the following steps: (1) Weigh the corresponding raw materials according to the component contents of the optical glass and mix them evenly; (2) Melt the evenly mixed raw materials at high temperature under N2 protection, use mechanical stirring to clarify and homogenize them, and anneal after casting and forming to obtain a high refractive index optical glass.

2. The optical glass according to claim 1, wherein, Comprising components with the following weight percentages: La2O3: 32% - 35%; Ga2O3: 16% - 20%; Nb2O5: 12% - 15%; TiO2: 6% - 8%; HfO2: 6% - 8%; Ta2O5: 5% - 8%; SiO2: 5% - 7%; BaO: 3% - 6%; RF3: 1% - 2%, where R is selected from one or both of La and Ga; C：0.01％-0.015％。 3. The method for preparing the optical glass according to claim 1 or 2, characterized in that, Comprising the following steps: (1) Weigh the corresponding raw materials according to the component contents of the optical glass and mix them evenly; (2) Melt the evenly mixed raw materials at high temperature under N2 protection, use mechanical stirring to clarify and homogenize them, and anneal after casting and forming to obtain a high refractive index optical glass.

4. The method for preparing the optical glass according to claim 3, characterized in that, The device used for the high-temperature melting includes a high-temperature atmosphere protection melting furnace, a Pt-20Rh crucible, and a Pt-30Rh stirrer.

5. The manufacturing method of the optical glass according to claim 4, characterized in that, During the high-temperature melting process, N2 with a purity of 5N is introduced into the furnace cavity, and the furnace cavity pressure is 0.11 MPa - 0.13 Mpa; And / or, during the high-temperature melting process, a Pt-30Rh frame stirrer is used for stirring to promote the clarification and homogenization of the glass liquid, the rotation speed is 50 rpm - 80 rpm, and the stirring time is 2 h - 4 h.

6. The preparation method of the optical glass according to claim 3, characterized in that, The temperature of the high-temperature melting is 1400 °C - 1450 °C, and the time is 4 h - 8 h.

7. The method for preparing the optical glass according to claim 3, wherein The forming temperature of the casting and forming is 1150 °C - 1250 °C, and the preheated mold temperature is 500 °C - 560 °C.

8. The manufacturing method of the optical glass according to claim 3, characterized in that, The annealing temperature is 700 °C - 730 °C, and the annealing time is 3 h - 5 h.

9. Application of the optical glass according to claim 1 or 2 as a lens in a virtual reality system, a digital camera, or an in-vehicle display.

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