An optical glass and an optical assembly

Abstract

The present invention relates to an optical glass and an optical assembly, the optical glass comprising: 5 to 40 mol% of Yb2O3, 6 to 30 mol% of a Group 1A oxide, 5 to 40 mol% of SiO2, and 1 to 65 mol% of B2O3, wherein the Group 1A oxide is at least one of Li2O, Na2O, and K2O, the ratio of the mol% of the Yb2O3 to the Group 1A oxide is 0.167 to 6.67%, the average transmittance for light having a wavelength of 400 to 700 nm is 80% or more, and the average transmittance for light having a wavelength of 930 to 950 nm is 10% or less when the thickness of the optical glass is 1 mm.

Description

Technical Field

[0001] This invention relates to an optical component, and more specifically to an optical glass and an optical component. Background Technology

[0002] In automotive ADAS (Advanced Driver Assistance Systems), such as automatic braking and lane keeping assist systems, systems integrating cameras and millimeter-wave radar have become mainstream. However, it is generally believed that to achieve autonomous driving, LiDAR technology needs to be added, and these three technologies need to be integrated. LiDAR, short for Light Detection and Ranging, is a telemetry method that uses near-infrared, visible, or ultraviolet light to illuminate an object and captures its reflected light through optical sensors to measure distance. The characteristic of LiDAR is that it can accurately detect not only the distance to an object but also its position and shape. LiDAR systems are one of the remote sensing technologies that utilize light. They illuminate an object with pulsed laser light, measure its scattered light, and analyze the distance to distant objects and the properties of the object. Therefore, it is less affected by ambient light or direct sunlight, and generally uses lasers in the 900nm wavelength range (e.g., 905nm, 940nm, 970nm). For autonomous driving of cars, the ability to drive safely on highways and ordinary roads is required. In order to ensure the redundancy of the sensing system, imaging devices with solid-state imaging components such as CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) are usually used with LiDAR systems.

[0003] Solid-state imaging devices have spectral sensitivity from the near-ultraviolet to the near-infrared region. When used in conjunction with a LiDAR system, they are affected by the laser from the LiDAR system, which can lead to problems in obtaining good color reproduction. Therefore, imaging devices need to be equipped with near-infrared cutoff filters to block the laser from the LiDAR system.

[0004] Solid-state imaging devices have expanded their applications to include surveillance cameras and automotive cameras that operate day and night. These devices need to acquire both color images based on visible light and monochrome images based on infrared light. Therefore, it is necessary to develop an optical filter that allows visible light to pass through and faithfully reproduces the visible light-based image, while also selectively allowing specific near-infrared light to pass through—a so-called dual-bandpass filter.

[0005] In the prior art, infrared cut-off filters either form a dielectric multilayer film on a glass substrate to reflect light of a specified wavelength, such as near-infrared light, through the dielectric multilayer film, or form an absorption layer on the glass substrate to absorb light of a specified wavelength, such as near-infrared light, through the absorption layer.

[0006] For a filter with a dielectric multilayer film formed on a glass substrate, light of a specified wavelength, such as near-infrared light, incident on the near-infrared cutoff filter will be reflected by the dielectric multilayer film, allowing only light of the desired wavelength, such as visible light, to pass through. Therefore, for a solid-state imaging device that receives the transmitted light, an image with better color reproduction can be obtained. However, when using a LiDAR system and imaging device simultaneously, the near-infrared light from the LiDAR system is reflected by the dielectric multilayer film of the near-infrared cutoff filter, causing this reflected light to become interference for the LiDAR system and thus affecting its measurement accuracy. Furthermore, when light strikes the dielectric multilayer film obliquely, the optical path length increases, causing phase difference, a shift in the spectral transmittance curve towards shorter wavelengths, and ripples in the spectral transmittance curve. This wavelength shift in the spectral transmittance curve leads to poor color reproduction in the solid-state imaging device. Additionally, the ripples in the spectral transmittance curve result in a ghosting phenomenon on the solid-state imaging device.

[0007] For optical filters with a near-infrared absorbing layer formed on a glass substrate, light of a specified wavelength, such as near-infrared light, is absorbed by the absorbing layer when incident on the near-infrared cutoff filter, allowing only visible light to pass through. For solid-state imaging devices that receive this transmitted light, images with better color reproduction can be obtained. However, the absorbing layer in traditional infrared filters contains near-infrared absorbing dyes and transparent resins, resulting in poor durability, heat resistance, and weather resistance. Furthermore, automotive LiDAR systems require higher outdoor safety and reliability; therefore, near-infrared cutoff filters used in LiDAR systems need to have significantly better durability, heat resistance, and weather resistance than usual.

[0008] Therefore, there is a need to develop an optical component that can stably maintain high transmittance in the visible light range, and also has durability, heat resistance, and weather resistance, and can absorb rather than reflect near-infrared light in a specific wavelength band. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an optical glass and an optical component.

[0010] To achieve the above objectives, the technical solution adopted in the first aspect of the present invention is as follows:

[0011] An optical glass comprising: 5-40 mol% Yb₂O₃, 6-30 mol% Group 1A oxides, 5-40 mol% SiO₂, and 1-65 mol% B₂O₃, wherein the Group 1A oxides are at least one of Li₂O, Na₂O, and K₂O, and the mol% ratio of Yb₂O₃ to the Group 1A oxides is 0.167-6.67%. When the thickness of the optical glass is 1 mm, the average transmittance for light with wavelengths between 400 and 700 nm is above 80%, and the average transmittance for light with wavelengths between 930 and 950 nm is below 10%.

[0012] In some embodiments, the optical glass further includes: 0-15 mol% Al2O3, 0-0.1 mol% Sb2O3, 0-35 mol% at least one oxide selected from CaO, ZnO and BaO, and 0-15 mol% at least one oxide selected from La2O3, Y2O3 and Gd2O3.

[0013] In some embodiments, the content of Al2O3 is 0~5 mol%, such as 0 mol%, 1 mol%, 2 mol%, 3 mol%, 4 mol%, or 5 mol%, but is not limited thereto.

[0014] In some embodiments, the total content of CaO, ZnO and BaO is 4~32 mol%, such as 4 mol%, 5 mol%, 10 mol%, 15 mol%, 20 mol%, 25 mol%, 30 mol% or 32 mol%, but not limited thereto.

[0015] In some embodiments, the combined content of La2O3 and Y2O3 is 4~15 mol%, such as 4 mol%, 5 mol%, 10 mol%, 15 mol%, but not limited thereto.

[0016] In some embodiments, the optical glass does not contain the Gd2O3.

[0017] In some embodiments, the Yb2O3 content is 5~30 mol%, 5 mol%, 10 mol%, 15 mol%, 20 mol%, 25 mol%, or 30 mol%, but is not limited thereto.

[0018] In some embodiments, the content of the group 1A oxide is 6 to 25 mol%, such as 6 mol%, 10 mol%, 15 mol%, 20 mol%, or 25 mol%, but is not limited thereto.

[0019] In some embodiments, the SiO2 content is 8~40 mol%, such as 8 mol%, 10 mol%, 15 mol%, 20 mol%, 25 mol%, 30 mol%, 35 mol%, or 40 mol%, but not limited thereto.

[0020] In some embodiments, the content of B2O3 is 10~50 mol%, such as 10 mol%, 15 mol%, 20 mol%, 25 mol%, 30 mol%, 35 mol%, 40 mol%, 45 mol%, or 50 mol%, but is not limited thereto.

[0021] In some embodiments, when the thickness of the optical glass is 1 mm, the average transmittance for light with wavelengths between 400 and 700 nm is 80-98%, such as 80%, 85%, 90%, or 95%, but not limited thereto; and / or, the average transmittance for light with wavelengths between 930 and 950 nm is 0-10%, such as 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%, but not limited thereto.

[0022] In some embodiments, when the thickness of the optical glass is 1 mm, the average transmittance for light with wavelengths between 400 and 700 nm is 85% to 90%, such as 85%, 90%, or 95%, but not limited thereto; and / or, the average transmittance for light with wavelengths between 930 and 950 nm is 0.2% to 10%, such as 0.2%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%, but not limited thereto.

[0023] In some embodiments, when the thickness of the optical glass is 2 mm, the average transmittance to light with wavelengths between 930 and 950 nm is less than 1%, wherein less than 1% specifically means 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1%, but is not limited thereto.

[0024] In some embodiments, the melting temperature of the optical glass is 1200~1400℃, such as 1200℃, 1250℃, 1300℃, 1350℃ or 1400℃, but is not limited thereto.

[0025] In some embodiments, the thickness of the optical glass is 0.2 to 10 mm, such as 0.2 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, but is not limited thereto.

[0026] In some embodiments, the optical glass is free of white spots, fogging, and crystallization. White spots refer to slight whitening or the appearance of white spots on the optical glass. Fogging refers to almost the entire surface of the optical glass turning white. Crystallization refers to the entire surface of the optical glass turning white and the presence of precipitates.

[0027] In some embodiments, the Group 1A oxide in the optical glass is Li₂O.

[0028] In some embodiments, the content of Li2O is 6~25 mol%, such as 6 mol%, 10 mol%, 15 mol%, 20 mol%, or 25 mol%, but is not limited thereto.

[0029] To achieve the above objectives, the second aspect of the present invention adopts the following technical solution:

[0030] An optical component, characterized in that it comprises optical glass as described above.

[0031] In some embodiments, the optical element is an optical lens or a light sensor.

[0032] In some embodiments, the optical components are used in conjunction with a LiDAR system.

[0033] In some embodiments, the optical glass does not have a dielectric multilayer film structure and / or an absorption layer structure.

[0034] In summary, the optical glass and optical components comprising the present invention, by defining the contents of Yb₂O₃, Group 1A oxides, the ratio of Yb₂O₃ to Group 1A oxides, SiO₂, and B₂O₃ respectively, without the need for additional dielectric multilayer film structures or absorption layer structures, enable the optical glass to have high transmittance in the visible light band and low transmittance in a specific near-infrared light band, while maintaining a low specific gravity. Simultaneously, it improves the chemical durability, weather resistance, thermal stability, and melt properties of the optical glass, increases the glass transition temperature and thus enhances machinability, makes it less prone to crystallization, and facilitates passing environmental weather resistance tests. It is particularly suitable for outdoor use in conjunction with automotive LiDAR systems. Attached Figure Description

[0035] To further understand the features and technical content of this invention, please refer to the following detailed description and accompanying drawings. However, the following detailed description and accompanying drawings are only used to illustrate this invention and are not intended to limit the scope of protection of this invention in any way.

[0036] Figure 1 The transmittance spectra of the optical glasses prepared in Examples 1 to 6 and Comparative Example 2 for light with wavelengths of 350 to 1150 nm are shown.

[0037] Figure 2 The transmittance spectra of the optical glasses prepared in Examples 6 to 10 for light with wavelengths of 350 to 1150 nm are shown. Detailed Implementation

[0038] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the spirit, advantages, and effects of the present invention based on the content described herein.

[0039] When the terms "comprising," "including," or "having" a specific element are used in this invention, unless otherwise stated, they may include other components, parts, structures, regions, locations, devices, systems, steps, or connections, rather than excluding such other elements.

[0040] This invention provides an optical glass that, when the thickness of the optical glass is 1 mm, has an average transmittance of over 80% for light with wavelengths between 400 and 700 nm, and an average transmittance of less than 10% for light with wavelengths between 930 and 950 nm. The incident direction of the light is the normal direction of the principal surface of the optical glass, i.e., the incident angle is 0°.

[0041] In some embodiments, when the thickness of the optical glass is 1 mm, the average transmittance for light with wavelengths between 400 and 700 nm is 80-98%, and the average transmittance for light with wavelengths between 930 and 950 nm is 0-10%.

[0042] In some embodiments, when the thickness of the optical glass is 1 mm, the average transmittance for light with wavelengths between 400 and 700 nm is 85% to 90%, and / or the average transmittance for light with wavelengths between 930 and 950 nm is 0.2% to 10%.

[0043] In some embodiments, when the thickness of the optical glass is 2 mm, the average transmittance to light with wavelengths between 930 and 950 nm is less than 1%.

[0044] Specifically, the optical glass comprises 5-40 mol% Yb₂O₃ and 6-30 mol% Group 1A oxides, and the mol% ratio of Yb₂O₃ to Group 1A oxides is 0.167-6.67%. In some embodiments, the Yb₂O₃ content is 5-30 mol%, and in some embodiments, the Group 1A oxide content is 6-25 mol%, wherein the Group 1A oxide is at least one of Li₂O, Na₂O, and K₂O.

[0045] Conventional optical glass does not absorb sufficiently in the near-infrared region. To achieve sufficient absorption, for example, the thickness of the optical glass needs to be increased, which may be difficult to implement due to the recent trend of miniaturization and reduction in height of camera modules. Therefore, the optical glass provided by this invention contains ytterbium (Yb) and has absorption characteristics in the near-infrared region. Yb has an absorption effect in the 940nm near-infrared region. In addition, Yb is a heavy rare earth element, and as a component of glass, its large atomic weight increases the specific gravity of the optical glass. When the specific gravity of the optical glass increases, the optical lens becomes heavier. When such a lens is installed in an autofocus lens, power consumption increases, and battery consumption becomes serious. From the above perspectives, it is necessary to reduce the proportion of Yb in the composition of the optical glass.

[0046] The optical glass in this invention includes Yb₂O₃ oxide, which increases the refractive index of the optical glass. This component also improves the chemical durability and weather resistance of the optical glass, increases the glass transition temperature, and thus enhances its machinability. However, when the Yb₂O₃ content is too high, it reduces the thermal stability of the glass, leading to crystallization during glass manufacturing and increasing the molten residue of raw materials during glass melting, thereby reducing its meltability. Furthermore, when the glass transition temperature decreases, the optical glass becomes more prone to breakage during mechanical processing, such as cutting, shaving, grinding, and polishing, thus reducing its machinability.

[0047] In this invention, Li₂O is used to improve the meltability and formability of glass, but as the content of Li₂O increases, the thermal stability of the glass will decrease. Na₂O and K₂O both have the effect of improving the meltability of glass, but when the content of these components increases, they tend to reduce the thermal stability, chemical durability, weather resistance, and machinability of the glass.

[0048] Specifically, the optical glass also includes 5-40 mol% SiO2 and 1-65 mol% B2O3. In some embodiments, the SiO2 content is 8-40 mol%, and in some embodiments, the B2O3 content is 10-50 mol%.

[0049] Among the network-forming components of glass, SiO2 and B2O3, SiO2 is effective in improving the thermal stability, chemical durability, weather resistance, machinability, and viscosity adjustment during molten glass forming. However, as the SiO2 content increases, it increases the molten residue of raw materials during molten glass formation, thus reducing its solubility. B2O3 is superior to SiO2 in improving solubility, but it is prone to volatilization during melting.

[0050] Therefore, based on the above viewpoints, this invention, by separately limiting the content of Yb2O3, the content of Group 1A oxides, the ratio of Yb2O3 to Group 1A oxides, the content of SiO2, and the content of B2O3, enables the obtained optical glass to absorb light in the near-infrared region of specific wavelengths, maintain a low specific gravity of the optical glass, and improve the chemical durability, weather resistance, thermal stability, and melting properties of the optical glass, increase the glass transition temperature, thereby improving machinability, making it less prone to crystallization, and also helping to pass environmental weather resistance tests. It is especially suitable for outdoor use in conjunction with automotive LiDAR systems.

[0051] Specifically, the optical glass further includes 0-15 mol% Al₂O₃, 0-0.1 mol% Sb₂O₃, 0-35 mol% at least one oxide selected from CaO, ZnO, and BaO, and 0-15 mol% at least one oxide selected from La₂O₃, Y₂O₃, and Gd₂O₃. In some embodiments, the content of Al₂O₃ is 0-5 mol%; the combined content of CaO, ZnO, and BaO is 4-32 mol%; the combined content of La₂O₃ and Y₂O₃ is 4-15 mol%; and the optical glass does not contain Gd₂O₃.

[0052] Al₂O₃ is a component that improves the chemical durability and weather resistance of glass. However, as the Al₂O₃ content increases, there is a tendency for the refractive index to decrease, the thermal stability of the glass to decrease, and the melt flowability to decrease. Therefore, the Al₂O₃ content was determined based on these considerations.

[0053] Sb2O3 can be added as a flocculant. Although it can suppress the decrease in light transmittance caused by the mixing of a small amount of impurities such as Fe, adding too much Sb2O3 will tend to increase the coloration of the glass.

[0054] ZnO promotes the melting of glass raw materials during glass melting, thus improving its solubility. It also adjusts the refractive index, Abbe number, and lowers the glass transition temperature. CaO and BaO are also components that improve the solubility of glass; however, as the content of these components increases, the thermal stability of the glass decreases, exhibiting a tendency to crystallize.

[0055] La₂O₃ can improve thermal stability and suppress the increase in specific gravity without significantly reducing the light transmittance in the near-infrared region, thus providing high-refractive-index, low-dispersion glass. Y₂O₃ is a component that improves the thermal stability of glass without significantly reducing the light transmittance in the near-infrared region. Furthermore, due to its small atomic weight, Y₂O₃ is a preferred component in suppressing the increase in the specific gravity of glass. However, when the content of Y₂O₃ is too high, the thermal stability of the glass decreases significantly, and it is prone to crystallization. Gd, like Yb, belongs to the heavy rare earth elements. As a component of glass, Gd has a large atomic weight, which increases the specific gravity of the glass. From this perspective, it is preferable to reduce the proportion of Gd in the glass composition.

[0056] Therefore, based on the above viewpoints, the present invention limits the contents of Al2O3, Sb2O3, CaO, ZnO, BaO, La2O3, Y2O3 and Gd2O3 respectively.

[0057] To obtain the desired glass composition, oxides, carbonates, sulfates, nitrates, hydroxides, etc., used as raw materials are weighed, mixed, and thoroughly blended to form a mixture. This mixture is then heated, melted, degassed, and stirred evenly in a molten vessel to produce bubble-free molten glass, which is then shaped. Specifically, it can be produced using known melting methods. The aforementioned glass, due to its excellent thermal stability, can be stably manufactured using known melting and shaping methods.

[0058] In the optical glass of this invention, incident light is absorbed by rare earth elements that absorb near-infrared radiation when passing through the glass. Since only near-infrared radiation in the 940nm wavelength band is attenuated and emitted, the spectral transmittance characteristics of the optical glass can be described by the so-called Beer-Lambert law, and are determined by the concentration of the near-infrared-absorbing rare earth element Yb₂O₃. In other words, the concentration of the near-infrared-absorbing rare earth element in the optical glass of this invention is adjusted to maintain high transmittance stably in the visible range, and exhibits a sharply attenuated spectral transmittance characteristic in the 940nm wavelength band.

[0059] Based on this structure, optical glass, lacking traditional dielectric multilayer films or absorption layers, not only possesses superior oblique incidence characteristics but also exhibits excellent durability, heat resistance, and weather resistance. It can stably maintain high light transmittance and absorb near-infrared radiation within the visible light range. The thickness of the optical glass ranges from 0.2 to 10 mm. Furthermore, the melting temperature of the optical glass is 1200–1400°C. In addition, the optical glass passes a 1000-hour environmental weathering test, exhibiting no white spots, fogging, or crystallization. White spots refer to slight whitening or the appearance of white dots; fogging refers to almost the entire surface of the optical glass turning white; and crystallization refers to the entire surface of the optical glass turning white with exudates. The environmental weathering test involves placing the optical glass in an environment at 85°C and 85% humidity to test the degree of appearance degradation.

[0060] The optical glass of this invention can be applied to optical components, which are devices that use light to record or transmit information. Examples of optical components include digital still camera imaging devices and light sensors that detect light and convert it into electrical signals. By applying the optical glass of this invention to optical components, its excellent absorption characteristics in the near-infrared region contribute to the miniaturization and height reduction of optical devices.

[0061] When this optical glass is used in optical components, it can be used in conjunction with optical filters that have different light absorption characteristics than this optical glass. Examples of optical filters with different light absorption characteristics include: absorption characteristics in different wavelength regions compared to the optical glass of this invention, or different absorption characteristics in the same near-infrared wavelength region. By using this optical glass in conjunction with optical filters having different light absorption characteristics in optical components, optical properties that are difficult to obtain with a single type of glass can be achieved. Examples of optical filters include: infrared cut-off filters located near the camera assembly of an imaging device, cover glass covering the object-side opening of an optical device, and lenses located inside an optical device.

[0062] The optical glass of the present invention will be described below with reference to specific embodiments, but the optical glass of the present invention is not limited to the following embodiments.

[0063] Examples 1-6 and Comparative Examples 1-4: The methods for preparing the optical glasses of these examples and comparative examples are as follows:

[0064] The raw materials include silica powder, boric acid, oxides, hydroxides, carbonates, nitrates, and sulfates. Each raw material is weighed separately and thoroughly mixed and blended. The resulting blended material is placed in a platinum crucible and heated at 1200-1500℃ for 2-4 hours, undergoing melting, flocculation, and stirring to obtain homogenized molten glass. The molten glass is poured into a preheated mold and rapidly cooled, held at a temperature close to the glass transition temperature for 2 hours, and then cooled at a rate of -30℃ / hour to prepare optical glass samples.

[0065] The specific component ratios, melting temperatures, spectral characteristics, and environmental weathering test results of Examples 1-6 and Comparative Examples 1-4 are shown in Table 1. The thickness of Examples 1-6 and Comparative Examples 1-4 is 1 mm, and all components are expressed in mol%.

[0066] Table 1

[0067]

[0068] Examples 7-10: The preparation method and composition ratio of the optical glass in these examples are the same as those in Example 6. The difference from Example 6 is the thickness of the optical glass in Examples 7-10. Specifically, the thickness, melting temperature, spectral characteristics and environmental weathering resistance test results of Examples 7-10 are shown in Table 2.

[0069] Table 2

[0070]

[0071] The transmittance of the optical glass in Examples 1-6 and Comparative Example 2 for light with wavelengths of 350~1150nm is as follows: Figure 1 As shown, the transmittance of the optical glass in Examples 6-10 for light with wavelengths of 350~1150nm is as follows: Figure 1 As shown. The incident direction of the light is the normal direction of the principal surface of the optical glass, i.e., the incident angle is 0°.

[0072] From Table 1 and Figure 1 It can be seen that the proportions of each component in Examples 1-6 are all within the range defined by the present invention. In Comparative Example 1, the content of Yb2O3, the content of Group 1A oxides, and the ratio of Yb2O3 to Group 1A oxides are all outside the range defined by the present invention. In Comparative Example 2, the content of Yb2O3 and the ratio of Yb2O3 to Group 1A oxides are both below the range defined by the present invention. In Comparative Example 3, the content of Group 1A oxides is below the range defined by the present invention. In Comparative Example 4, the content of Yb2O3 is above the range defined by the present invention.

[0073] The melting temperature and spectral characteristics of the optical glasses obtained in Examples 1-6 are all within the range defined by the present invention, and they can also pass the environmental weathering test.

[0074] The optical glass of Comparative Example 1 thus obtained has a melting temperature higher than the range defined in this invention, that is, poor meltability. As a result, under the same processing temperature, there are unmelted parts in the optical glass of Comparative Example 1, resulting in poor glass quality. In addition, the optical glass of Comparative Example 1 crystallizes and cannot achieve the optical properties defined in this invention.

[0075] The optical glass of Comparative Example 2 obtained thus failed the environmental weathering test, that is, it has poor weathering resistance. In addition, the average transmittance of the optical glass of Comparative Example 2 for light with wavelengths between 930 and 950 nm is 21.8%, which is far higher than the range defined by the present invention, and it cannot achieve the optical characteristics defined by the present invention.

[0076] The optical glass crystals obtained in Comparative Examples 3-4 thus cannot achieve the optical properties defined in this invention.

[0077] From Table 2 and Figure 2 It can be seen that the component ratios, melting temperatures, and spectral characteristics of Examples 7-10 are all within the range defined by the present invention, and can also pass the environmental weathering test.

[0078] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Therefore, all equivalent technical changes made based on the description and drawings of the present invention are included within the protection scope of the present invention.

Claims

1. An application of optical glass in optical components, characterized in that... The optical component is a digital still camera imaging device, and the optical glass is a near-infrared cutoff glass. The optical glass comprises: 5-40 mol% Yb₂O₃, 6-30 mol% Group 1A oxides, 5-40 mol% SiO₂, and 10-65 mol% B₂O₃, wherein the Group 1A oxides are at least one of Li₂O, Na₂O, and K₂O. The mol% ratio of Yb₂O₃ to the Group 1A oxides is 0.167-6.67%. When the thickness of the optical glass is 1 mm, the average transmittance for light with wavelengths between 400 and 700 nm is above 80%, and the average transmittance for light with wavelengths between 930 and 950 nm is below 10%.

2. The application of the optical glass according to claim 1 in optical components, characterized in that: The optical glass further includes: 0-15 mol% Al2O3, 0-0.1 mol% Sb2O3, 0-35 mol% at least one oxide selected from CaO, ZnO and BaO, and 0-15 mol% at least one oxide selected from La2O3, Y2O3 and Gd2O3.

3. The application of the optical glass according to claim 2 in optical components, characterized in that: The content of Al2O3 is 0~5 mol%; and / or, the total content of CaO, ZnO and BaO is 4~32 mol%; and / or, the total content of La2O3 and Y2O3 is 4~15 mol%; and / or, the optical glass does not contain Gd2O3.

4. The application of the optical glass according to claim 1 in optical components, characterized in that: The Yb2O3 content is 5~30 mol%; and / or, the group 1A oxide content is 6~25 mol%; and / or, the SiO2 content is 8~40 mol%; and / or, the B2O3 content is 10~50 mol%.

5. The application of the optical glass according to claim 1 in optical components, characterized in that: When the thickness of the optical glass is 1 mm, the average transmittance for light with wavelengths between 400 and 700 nm is 80-98%, and / or the average transmittance for light with wavelengths between 930 and 950 nm is 0-10%.

6. The application of the optical glass according to claim 5 in optical components, characterized in that: When the thickness of the optical glass is 1 mm, the average transmittance for light with wavelengths between 400 and 700 nm is 85% to 90%, and / or the average transmittance for light with wavelengths between 930 and 950 nm is 0.2% to 10%.

7. The application of the optical glass according to claim 1 in optical components, characterized in that: When the thickness of the optical glass is 2 mm, the average transmittance to light with wavelengths between 930 and 950 nm is less than 1%.

8. The application of the optical glass according to claim 1 in optical components, characterized in that: The melting temperature of the optical glass is 1200~1400℃.

9. The application of the optical glass according to claim 1 in optical components, characterized in that: The thickness of the optical glass is 0.2~10mm.

10. The application of the optical glass according to claim 1 in optical components, characterized in that: The group 1A oxide in the optical glass is Li₂O.

11. The application of the optical glass according to claim 1 in optical components, characterized in that: The optical components are used in conjunction with the LiDAR system.

12. The application of the optical glass according to claim 1 in optical components, characterized in that: The optical glass does not have a dielectric multilayer film structure and / or an absorption layer structure.

Images