High-strength high-transmittance stray light eliminating cover plate glass as well as preparation method and application thereof

Abstract

The invention relates to a special glass material, in particular to high-strength and high-transmittance stray light eliminating cover plate glass as well as a preparation method and application thereof. The invention relates to a high-temperature-resistant ceramic which is prepared from the following components in percentage by mass: 55.0 to 66.0 percent of SiO2, 17.0 to 23.0 percent of Al2O3, 2.0 to 7.0 percent of B2O3, 10.0 to 15.0 percent of Na2O, 0 to 1.0 percent of CaO, 1.5 to 3.0 percent of MgO, 0 to 3.0 percent of CeO2 and 0 to 5.0 percent of Bi2O3. The cover plate glass provided by the invention has strong transmittance to light in ultraviolet, visible and near-infrared bands, the stray light eliminating layer can be formed through blackening reduction, the stray light eliminating layer can be blackened from the substrate, has good absorptivity to stray light, and meanwhile has relatively high bending strength, so that the cover plate glass can be applied to the field of light emitting devices. The method can be applied to instruments and equipment requiring high image definition and high strength, such as a mobile phone camera and a camera cover plate.

Description

Technical Field

[0001] The present invention relates to special glass materials, and in particular to a high-strength, high-transmittance, stray-light eliminating cover glass, a preparation method thereof, and an application thereof. Background Art

[0002] In recent years, with the continuous development of intelligent electronic devices such as mobile phones, cameras, and computers, the application of optical glass in electronic device imaging, photography, and laser components has become more and more extensive. In particular, the demand for electronic product display screens has been continuously rising in recent years, and the application of touch panels in display screens has become more and more extensive. The touch module is a sensitive electronic component and requires a cover plate for protection. At the same time, the backplane materials of mobile phones and intelligent wearable devices have gradually developed towards the direction of de-metallization.

[0003] With the continuous development of technologies such as 5G, wireless charging, and human health monitoring, the requirements for the signal transmission, charge conduction, and anti-crosstalk capabilities of the back cover material are constantly increasing. The metal back cover affects the transmission efficiency, while non-metal materials such as glass and ceramics are more suitable for 5G technology applications. Among the emerging materials, the PC+PMMA composite material can simultaneously meet the requirements of rigidity and wireless charging without shielding, and has a cost advantage. However, its hardness is still at a certain distance from that of glass and ceramics. However, due to the problem of yield rate, the speed of large-scale use of ceramics is slower than that of glass.

[0004] For example, for the cover glass used in mobile phone lenses, when the off-axis light reaches the non-optical surfaces outside the effective light-transmitting aperture of the lens, the reflected light on these surfaces reaches the image plane through the effective light-transmitting aperture, forming stray light. When there is more stray light in the camera, it will lead to a reduction in the imaging effect and photo quality. This requires that the cover glass used in mobile phone lenses has good anti-crosstalk ability to stray light. Therefore, the stray light test is an important link in the performance evaluation of the cover glass for mobile phone lenses. The existing mobile phone camera glass cover plate will adhere black light-shielding ink to its edge and one side to eliminate stray light. However, the ink has problems such as low surface tension, insufficient adhesion when adhered to the 0TC panel, and unstable adhesion, and cannot meet the adhesion requirements with a relatively high dyne value. Therefore, it is of great significance to develop a high-strength, high-transmittance, and self-darkening cover glass. Summary of the Invention

[0005] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a high-strength, high-transmittance, stray-light eliminating cover glass, a preparation method thereof, and an application thereof. The cover glass provided by the present invention has strong transmittance to light in the ultraviolet, visible, and near-infrared bands. Through blackening reduction, a stray-light eliminating layer can be formed. This stray-light eliminating layer can turn black from the substrate and has good absorption rate for stray light. At the same time, it has a relatively high bending strength and can be applied to instrument devices such as mobile phone cameras and camera cover plates that require high image clarity and high strength.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] In a first aspect, a high-strength and high-transmittance stray-light eliminating cover glass is composed of the following components in terms of mass percentage: SiO 2 55.0 - 66.0%, Al 2 O 3 17.0 - 23.0%, B 2 O 3 2.0 - 7.0%, Na 2 O 10.0 - 15.0%, CaO 0 - 1.0%, MgO 1.5 - 3.0%, CeO 2 0 - 3.0%, Bi 2 O 3 0 - 5.0%; wherein, the contents of Bi 2 O 3 and CeO 2 are not both 0 at the same time.

[0008] The sum of the mass percentages of each component is 100%.

[0009] In the above glass system of the present invention, the addition of Bi 2 O 3 can improve the refractive index and dispersion ability of the glass. Bi 2 O 3 also helps to enhance the thermal stability of the glass and its light absorption ability. At the same time, since the Bi element (usually introduced as Bi 2 O 3 or Bi(NO 3 ) 3 ) can be reduced to black in a high-temperature hydrogen atmosphere, this characteristic can be used to optimize the stray-light absorption effect; at the same time, CeO 2 has excellent thermal stability and physical properties, which can improve the impact resistance and heat resistance of the glass, making the glass harder and more durable. In addition, the introduction of CeO 2 can also enhance the blackening effect of the glass; the present invention controls the contents and ratios of Bi 2 O 3 , the clarifying agent CeO 2 and other oxides not only adjust the mechanical strength and optical properties of the glass, but also can further enhance the stray-light eliminating effect after blackening reduction.

[0010] In the glass system provided by the present invention, it contains SiO 2 , Al 2 O 3 , B 2 O 3、 Na 2O, CaO, MgO, CeO 2 and Bi 2 O 3 , by precisely controlling SiO 2 , Al 2 O 3 , B 2 O 3、 Na 2 O, CaO, MgO, CeO 2 and Bi 2 O 3 These components and their contents achieve excellent comprehensive properties, including chemical stability, thermal stability, optical transmittance, and stray light absorption rate after reduction and blackening, etc. SiO 2 , CaO, B 2 O 3 , Al 2 O 3 and the integrated effect of MgO jointly improve the thermal stability and chemical stability of the glass. SiO 2 as the main component provides the basis of the structure; the synergistic effect of CaO, B 2 O 3 , Al 2 O 3 and Na 2 O regulates the thermal expansion coefficient and enhances the chemical stability. The addition of MgO further improves the erosion resistance of the glass in a complex environment and extends the service life. The introduction of Al 2 O 3 , MgO, B 2 O 3 and CeO 2 improves the optical quality and enhances the optical transmittance performance of the glass material. In addition, by adjusting the contents of Al 2 O 3 , MgO and CaO, the crystallization tendency of the glass is effectively reduced, and the transmittance performance of the formed glass is further improved. The common effect of Na 2 O and CeO 2 reduces the clarification difficulty of the glass and reduces defects such as bubbles during the glass melting process.

[0011] In a second aspect, a method for preparing the above-mentioned high-strength and high-transmittance stray light eliminating cover glass includes the following steps:

[0012] Mix the raw materials evenly according to the ratio to obtain a mixture, and melt, stir, clarify, and form the mixture in sequence.

[0013] In a third aspect, an application of the above-mentioned high-strength and high-transmittance stray light eliminating cover glass in the optical field or the intelligent technology field.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The bending strength of the high-strength and high-transmittance stray-light eliminating cover glass provided by the present invention is greater than 125 MPa. In the wavelength range of 400 - 1000 nm, the maximum transmittance ≥ 90.6%, and the minimum transmittance ≥ 86.6%.

[0016] 2. The acid resistance stability and moisture resistance stability of the high-strength and high-transmittance stray-light eliminating cover glass provided by the present invention are Grade 1, with good mechanical properties and processing properties, meeting the requirements of various high-transmittance and high-strength glass cover materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0018] Figure 1 It is a transmittance comparison curve graph of the 2-mm-thick glass products of Comparative Example 1 and Example 3 in the wavelength range of 350 - 1000 nm.

[0019] Figure 2 It is a bending strength comparison graph of the glass materials of Examples 1 - 7 and Comparative Examples 1 - 3.

[0020] Figure 3 It is a schematic diagram of the glass cover for a machine camera, where 1 is the light passing hole, 2 is the lens passing hole, and 3 is the stray light absorption area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanations of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] The present invention provides a high-strength and high-transmittance stray-light eliminating cover glass, its preparation method and application.

[0024] In a typical embodiment of the present invention, a high-strength and high-transmittance stray-light eliminating cover glass is provided, which is composed of the following components in terms of mass percentage: SiO2 55.0 to 66.0%, Al 2 O 3 17.0 to 23.0%, B 2 O 3 2.0 to 7.0%, Na 2 O 10.0 to 15.0%, CaO 0 to 1.0%, MgO 1.5 to 3.0%, CeO 2 0 to 3.0%, Bi 2 O 3 0 to 5.0%; wherein, Bi 2 O 3 and CeO 2 do not have a content of 0 simultaneously.

[0025] In the present invention, SiO 2 is a glass - forming oxide. As the main constituent of the glass, it provides the basic framework of the structure, endows the glass with good chemical stability and mechanical strength. A suitable SiO 2 content can reduce the thermal expansion coefficient of the glass, and improve the thermal stability, chemical stability, softening temperature, heat resistance, hardness and mechanical strength of the glass, etc. An excessively high SiO 2 content may lead to an increase in the melting point and difficulty in processing; an excessively low SiO 2 content will weaken the chemical stability and mechanical strength of the glass. The content of SiO 2 is preferably 55.0 to 65.0%, 55.0 to 63.0%, 55.0 to 58.0%, 55.0 to 57.0%, 55.0 to 56.5%, 55.0 to 56.0%, 58.0 to 63.0%, 57.0 to 63.0%, 56.5 to 63.0%, 56.0 to 58.0%, 58.0 to 65.0%, 60 to 65.0%, 56.5 to 57.9%, 56.8 to 57.5%, etc.

[0026] Al 2 O 3 is an essential component for improving the chemical stability of the glass. It can reduce the crystallization tendency of the glass, and is also a component for increasing the hardness and mechanical strength of the glass and increasing the tensile elastic modulus. In the glass network structure, alumina is a network intermediate oxide, between the network - forming body and the network - modifying body. In glasses with an alumina content of less than 2%, alumina basically exists entirely in the four - coordinate form. In medium / high - alumina silicate glasses, aluminum has two coordinations. One is the four - coordinate case, where A1 3+ is located in the tetrahedron to form an aluminum - oxygen tetrahedron [AlO 4 ; the other is the six - coordinate case, that is, A1 3+ is located in the octahedron to form an aluminum - oxygen octahedron [AlO6 . When it is in a high coordination state, it makes the glass have a high refractive index and a small molecular volume; when it is in a low coordination state, the refractive index and density of the glass decrease. Al 2 O 3 The content of is preferably 17.0 - 22.0%, 17.0 - 21.0%, 17.0 - 20.5%, 17.0 - 20.0%, 17.0 - 19.0%, 17.0 - 18.5%, 17.0 - 18.0%, 17.0 - 17.5%, 17.5 - 22.0%, 17.5 - 21.0%, 17.5 - 20.5%, 17.5 - 20.0%, 17.5 - 19.0%, 17.5 - 18.5%, 18.0 - 22.0%, 18.0 - 21.0%, 18.0 - 20.5%, 18.0 - 20.0%, 18.0 - 19.0%, 18.0 - 18.5%, 19.0 - 22.0%, 19.0 - 21.0%, 19.0 - 20.5%, 19.0 - 20.0%, etc.

[0027] In the present invention, B 2 O 3 is also a glass - forming oxide. It forms structural units with borate triangles [BO 3 and borate tetrahedrons [BO 4 , and together with silicate tetrahedrons, it forms a structural network in borosilicate glass. B 2 O 3 can reduce the viscosity of the glass at high temperatures and increase the viscosity of the glass at low temperatures. Therefore, the glass with a higher content of B 2 O 3 has a wider forming temperature range. In addition, B 2 O 3 also plays a role in promoting melting, accelerating the dissolution and clarification of the glass. However, when the addition amount of B 2 O 3 is too high, due to the increase in borate triangles, the thermal expansion coefficient of the glass and others will increase instead, resulting in the boron anomaly phenomenon and reducing the chemical stability of the glass. The content of B 2 O 3 is preferably 2.0 - 6.0%, 2.0 - 5.5%, 2.0 - 5.0%, 2.0 - 4.5%, 2.0 - 4.0%, 2.0 - 3.5%, 2.0 - 3.0%, 3.0 - 6.0%, 3.0 - 5.5%, 3.0 - 5.0%, 3.0 - 4.5%, 3.0 - 4.0%, 3.0 - 3.5%, 3.5 - 6.0%, 3.5 - 5.5%, 3.5 - 5.0%, 3.5 - 4.5%, etc.

[0028] In the present invention, Na 2O is an oxide outside the glass network. Alkali metal ions are easy to move and diffuse in the vitreous body, which can reduce the viscosity of glass melting at high temperatures and make the glass easy to melt. It is a good flux, but the introduction amount cannot be too much. Excessive introduction will increase the thermal expansion coefficient of the glass and reduce the chemical stability, thermal stability and mechanical strength of the glass. Na 2 The content of O is preferably 11.0 - 15.0%, 12.0 - 15.0%, 12.5 - 15.0%, 13.0 - 15.0%, 13.5 - 15.0%, 14.0 - 15.0%, 11.0 - 14.5%, 12.0 - 14.5%, 11.0 - 14.0%, 12.0 - 14.0%, 12.5 - 13.5%, etc.

[0029] In the present invention, the introduction of CaO can increase the chemical stability and mechanical strength of the glass. At the same time, CaO can reduce the glass viscosity at high temperatures, which is beneficial to clarification. However, when the introduction amount is large, it is easy to cause glass crystallization and reduce the thermal stability of the glass; the introduction of MgO can improve the thermal stability of the glass and can reduce the thermal expansion coefficient of the glass. However, too much introduction of MgO will increase the glass viscosity and cause difficulties in glass forming. MgO and CaO jointly improve the mechanical strength and chemical durability of the glass in the present invention. The addition of MgO especially helps to reduce the increase in the thermal expansion coefficient caused by CaO. The content of CaO is preferably 0.1 - 1.0%, 0.1 - 0.9%, 0.1 - 0.8%, 0.1 - 0.7%, 0.1 - 0.6%, 0.1 - 0.5%, 0.1 - 0.4%, etc. The content of MgO is preferably 1.5 - 2.5%, 1.5 - 2.0%, 1.5 - 1.8%, 1.8 - 3.0%, 1.8 - 2.5%, 1.8 - 2.0%, 2.0 - 3.0%, 2.5 - 3.0%, etc.

[0030] In the present invention, the addition of Bi 2 O 3 can improve the refractive index and dispersion ability of the glass. Bi 2 O 3 also helps to improve the thermal stability of the glass and enhance the light absorption ability. At the same time, due to the Bi element (usually introduced as Bi 2 O 3 or Bi(NO 3 ) 3 ) can be reduced to black in a high-temperature hydrogen atmosphere, this characteristic can be used to optimize the stray light absorption effect. However, the introduction of Bi 2 O 3 needs to be precisely controlled. Excessive addition of Bi 2 O 3 may lead to a significant reduction in the chemical stability of the glass, especially when reacting with reducing gases, and its stability problem is more prominent. In addition, high concentrations of Bi2 O 3 During the glass melting process, it may cause severe erosion to the smelting vessel, which limits its application range in glass production. In addition, excessive Bi 2 O 3 may also promote glass crystallization and affect its transparency and optical uniformity. On the contrary, insufficient Bi 2 O 3 content makes it difficult to improve the optical properties. In the present invention, CeO 2 is a variable valence oxide. CeO 2 decomposes to release oxygen at high temperatures. The higher the temperature rises by 1 °C, the more oxygen can be separated from its chemical bonding, and the greater the clarification effect. And the solubility of oxygen decreases with the increase of temperature, thus generating the clarification effect. At the same time, CeO 2 has excellent thermal stability and physical properties, which can improve the impact resistance and heat resistance of the glass, making the glass harder and more durable. At the same time, the introduction of CeO 2 can also enhance the effect of glass darkening. The content of Bi 2 O 3 is preferably 0.1 - 5.0%, 0.1 - 4.5%, 0.1 - 4.0%, 0.1 - 3.6%, 0.1 - 3.5%, 0.1 - 3.0%, 0.1 - 2.5%, 0.1 - 2.0%, 0.5 - 5.0%, 0.5 - 4.5%, 0.5 - 4.0%, 0.5 - 3.6%, 0.5 - 3.5%, 0.5 - 3.0%, 0.5 - 2.5%, 0.5 - 2.0%, 1.0 - 5.0%, 1.0 - 4.5%, 1.0 - 4.0%, 1.0 - 3.6%, 1.0 - 3.5%, 1.0 - 3.0%, 1.0 - 2.5%, 1.0 - 2.0%, 1.2 - 5.0%, 1.2 - 4.5%, 1.2 - 4.0%, 1.2 - 3.6%, 1.2 - 3.5%, 1.2 - 3.0%, 1.2 - 2.5%, 1.2 - 2.0%, 2.0 - 3.0%, 3.0 - 4.0%, etc. The content of CeO 2 is preferably 0.1 - 3.0%, 0.1 - 2.5%, 0.1 - 2.0%, 0.1 - 1.5%, 0.1 - 1.0%, 0.1 - 0.5%, 0.1 - 0.3%, 0.5 - 3.0%, 1.0 - 3.0%, 1.5 - 3.0%, 2.0 - 3.0%, 2.5 - 3.0%, etc.

[0031] In some embodiments, the content of Bi 2 O 3 is less than five - halves times the content of B 2 O 3 . Research shows that the cover glass has better performance under this composition condition.

[0032] In some embodiments, the flexural strength is ≥125 MPa, preferably 125 - 134 MPa.

[0033] In some embodiments, it includes a light-transmitting effective area and / or a light-absorbing area; when the thickness of the light-transmitting effective area is 2 mm, in the wavelength range of 400 - 1000 nm, the maximum transmittance is ≥90.6%, preferably 90.6 - 92.5%, and the minimum transmittance is ≥86.6%, preferably 86.6 - 88.8%; the maximum optical transmittance of the light-absorbing area is ≤1.6%, preferably 1.3 - 1.6%.

[0034] In some embodiments, the coefficient of thermal expansion (α 20-300℃ ) within the temperature range of 20 - 300 °C is not higher than 77.7×10 -7 / °C, preferably (74.8 - 76.1)×10 -7 / °C. The cover glass of the present invention has a low coefficient of thermal expansion, which can reduce the dimensional change caused by temperature variation and maintain the accuracy and stability of the device.

[0035] In some embodiments, the softening point temperature is not higher than 883 °C, preferably 861 - 883 °C. Having a low softening point temperature is beneficial for forming and processing, and is conducive to saving energy and reducing production costs, especially during large-scale production.

[0036] The cover glass of the present invention has excellent acid resistance stability and moisture resistance stability, and their grades are both level 1, and can maintain the stability of the internal structure of the glass for a long time.

[0037] Another embodiment of the present invention provides a method for preparing the above-mentioned high-strength, high-transmittance and anti-glare cover glass, which includes the following steps:

[0038] Mix the raw materials evenly to obtain a mixture, and sequentially carry out melting, stirring, clarification, and forming on the mixture.

[0039] In some embodiments, the melting temperature is 1600 - 1620 °C. Specifically, the melting time is 8 - 30 h. At this melting time, it helps the clarification of the glass melt.

[0040] There are certain requirements for the uniformity of the glass melt before glass forming, so it is necessary to stir the glass melt before forming at a certain rotation speed for a period of time to improve the uniformity of the melt. In some embodiments, the stirring rotation speed is 10 - 20 r / min, and the stirring time is 3 - 12 h. When the uniformity of the melt is low, the melt is prone to layering or agglomeration, resulting in difficulties in melting and homogenizing the glass, and even stripe or stone defects may occur in severe cases.

[0041] In some embodiments, the forming temperature is 1570 - 1600 °C and the forming time is 5 - 25 min. Secondary bubbles, impurities, etc. are prevented from generating through rapid glass forming.

[0042] Through the above preparation method, a light-transmitting glass can be obtained with a maximum transmittance ≥ 90.6% and a minimum transmittance ≥ 86.6% within the wavelength range of 400 - 1000 nm, i.e., a light-transmitting glass as an effective light-transmitting region can be obtained. In order to enable the cover glass to have the performance of eliminating stray light, the cover glass can be further subjected to blackening treatment, thereby increasing the absorption rate of stray light of the glass and reducing the optical transmittance. Therefore, in some embodiments, the formed blank is subjected to blackening treatment. Specifically, the blackening treatment is carried out in a reducing atmosphere, the time of the blackening treatment is 4000 - 16000 min, the pressure of the reducing gas is 0.01 - 0.5 MPa, and the temperature is 450 - 570 °C. For example, in one embodiment, the blackening treatment is carried out in a reducing atmosphere, the temperature of the blackening treatment is 500 °C, the pressure is 0.18 MPa, and the time is 68 h. More specifically, the reduction treatment is carried out in a hydrogen atmosphere, and there are multiple cycles of gas charging and deflation during the entire reduction process, and one cycle period is 160 - 300 min.

[0043] In one or more embodiments, the formed blank is annealed and then subjected to blackening treatment. Annealing is carried out to eliminate the internal stress of the glass to meet the requirements of subsequent cold processing. Specifically, the annealing temperature is 500 - 620 °C.

[0044] The method of the present invention has process stability. The glass material prepared under this process method can exhibit stable characteristics and will not cause an ignorable fluctuation in glass performance due to the increase or decrease of the process within this range. Of course, it can be understood that within this process range, some higher temperatures can shorten the preparation process compared to lower temperatures. If it is necessary to shorten the time cost as much as possible, those skilled in the art can select a relatively higher temperature within the temperature range disclosed in the present invention during operation.

[0045] A third embodiment of the present invention provides an application of the above high-strength, high-transmittance, stray-light-eliminating cover glass in the optical field or the intelligent technology field.

[0046] In some embodiments, the high-strength, high-transmittance, stray-light-eliminating cover glass is used as an optical lens or an optical window.

[0047] In some embodiments, the high-strength, high-transmittance, stray-light-eliminating cover glass is used as the cover glass of a camera lens.

[0048] In order to enable those skilled in the art to more clearly understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in combination with specific examples and comparative examples.

[0049] The performance parameters in the following examples were obtained by the following methods:

[0050] The coefficient of thermal expansion α of the glass sample was measured using a DIL 402 type coefficient of thermal expansion measuring instrument produced by Netzsch, Germany. For sample preparation, the glass sample was polished into a cylindrical glass bar with a diameter of Φ6×50 mm, and both end faces were made parallel. The heating rate was set at 5 °C / min, and the data acquisition period was 20 ms. Refer to GB / T7962.16~2010.

[0051] The softening point temperature of the glass sample was measured using a Model PPV-1000 / 1200 type plate viscometer produced by Orton. For sample preparation: The glass sample was polished into a cylindrical glass bar with a diameter of Φ6×6 mm, and both end faces were made parallel. The sample was placed between the top and bottom disks, which were made of a heat-resistant metal alloy with a diameter of 44 mm and a thickness of 6 mm. The top metal disk was connected to the bottom of the probe rod. Two very thin platinum films (with a diameter of 40 mm and a thickness of 0.001 inches) were placed between the sample and the top and bottom disks to facilitate sampling and sample placement. Refer to ASTM C-1351M.

[0052] The transmittance test was carried out using a UV-Vis-NIR spectrophotometer.

[0053] After the surface of the polished glass sample was eroded by the measuring media with pH values of 2.9, 4.6, and 6.0, the time when purple-blue interference colors appeared on the glass surface, or when the surface showed variegated colors or peeling, was observed under an incandescent lamp. The acid resistance stability of the colorless optical glass was classified in a decreasing order according to the length of time. Refer to GB / T 7962.14~2010.

[0054] The polished glass sample was kept at a constant temperature and humidity of 50 °C and 85% relative humidity for 20 h, and the moisture resistance stability of the colorless optical glass was classified in a decreasing order by comparing with the turbidity values of the standard samples H (BaK7) and H (ZK9). Refer to GB / T7962.15~2010.

[0055] The flexural strength of the glass sample was tested using the three-point bending method. The glass sample was processed into the required size for testing, and then the glass sample was placed between two support points, and a fixed load perpendicular to the center of the sample was applied. Then, by applying different bending moments, the flexural stress and strain of the glass were measured under different conditions. Finally, the flexural strength of the glass was determined. Refer to GB / T 37781-2019.

[0056] Example 1

[0057] The components of the high-strength, high-transmittance, stray light-eliminating cover glass blank of this embodiment, the weight percentage of each component, and the physical properties of the obtained glass are shown in Table 1. Figure 2 .

[0058] The preparation method of the high-strength, high-transmittance, stray light-eliminating cover glass blank is as follows: quartz sand, aluminum hydroxide, boric acid, sodium nitrate, calcium carbonate, bismuth oxide, basic magnesium carbonate, cerium oxide, and bismuth oxide are used as raw materials, and after being fully mixed, they are melted at 1600°C for 8 hours, mechanically stirred (10r / min, 3 hours), assisted with high-temperature clarification, and formed at 1580°C (forming time is 5 minutes) to obtain the glass blank. The glass blank is placed in an annealing furnace preheated to 520°C for annealing and heat preservation for 2 hours. After the heat preservation is completed, the power is turned off and the temperature is lowered with the furnace to eliminate the stress in the glass to meet the requirements of later cold processing.

[0059] Example 2

[0060] The components of the high-strength, high-transmittance, stray light-eliminating cover glass blank of this embodiment, the weight percentage of each component, and the physical properties of the obtained glass are shown in Table 1. Figure 2 .

[0061] In the preparation method of the high-strength, high-transmittance, stray light-eliminating cover glass blank, the melting temperature is 1600°C, the melting time is 16 hours, mechanical stirring (20 r / min, 12 hours), the molding temperature is 1570°C, the molding time is 15 minutes, and the other preparation steps and parameters are the same as those in Example 1.

[0062] Example 3

[0063] The components of the high-strength, high-transmittance, stray light-eliminating cover glass blank, the weight percentage of each component, and the physical properties of the obtained glass are shown in Table 1. Figures 1 - 2 .

[0064] In the preparation method of the high-strength, high-transmittance, stray light-eliminating cover glass blank in this embodiment, the melting temperature is 1600°C and the melting time is 30 hours; mechanical stirring (20 r / min, 12 hours), the molding temperature is 1580°C, and the molding time is 25 minutes. The other preparation steps and parameters are the same as those in Example 1.

[0065] Example 4

[0066] The components of the high-strength, high-transmittance, stray light-eliminating cover glass blank, the weight percentage of each component, and the physical properties of the obtained glass are shown in Table 1. Figure 2 .

[0067] In the preparation method of the high-strength and high-transmittance stray-light eliminating cover glass blank in this embodiment, the melting temperature is 1620 °C and the melting time is 20 h; mechanical stirring (20 r / min, 14 h), the forming temperature is 1590 °C, and the forming time is 25 min. Other preparation steps and parameters are the same as those in Embodiment 1.

[0068] Example 5

[0069] The components of the high-strength and high-transmittance stray-light eliminating cover glass blank, the weight percentage of each component, and the physical properties of the obtained glass are shown in Table 1. Figure 2 。

[0070] In the preparation method of the high-strength and high-transmittance stray-light eliminating cover glass blank in this embodiment, the melting temperature is 1620 °C and the melting time is 25 h; mechanical stirring (20 r / min, 14 h), the forming temperature is 1600 °C, and the forming time is 25 min. Other preparation steps and parameters are the same as those in Embodiment 1.

[0071] Example 6

[0072] The components of the high-strength and high-transmittance stray-light eliminating cover glass blank, the weight percentage of each component, and the physical properties of the obtained glass are shown in Table 1. Figure 2 。

[0073] In the preparation method of the high-strength and high-transmittance stray-light eliminating cover glass blank in this embodiment, the melting temperature is 1600 °C and the melting time is 30 h; mechanical stirring (20 r / min, 12 h), the forming temperature is 1580 °C, and the forming time is 25 min. Other preparation steps and parameters are the same as those in Embodiment 1.

[0074] Example 7

[0075] The components of the high-strength and high-transmittance stray-light eliminating cover glass blank, the weight percentage of each component, and the physical properties of the obtained glass are shown in Table 1. Figure 2 。

[0076] In the preparation method of the high-strength and high-transmittance stray-light eliminating cover glass blank in this embodiment, the melting temperature is 1600 °C and the melting time is 30 h; mechanical stirring (20 r / min, 14 h), the forming temperature is 1580 °C, and the forming time is 25 min. Other preparation steps and parameters are the same as those in Embodiment 1.

[0077] Comparative Examples 1 to 3

[0078] The components of the glass in Comparative Examples 1 to 3, the weight percentage of each component, and the physical properties of the obtained glass are shown in Table 1. Figures 1 - 2 。

[0079] The preparation steps and parameters of the glass in Comparative Examples 1 to 3 are the same as those in Example 1.

[0080] Table 1 Components, contents and physical properties of the high-strength, high-transmittance and stray-light eliminating cover glass in Examples 1 to 7 and Comparative Examples 1 to 3 of the present invention

[0081]

[0082]

[0083] Among them, the maximum optical transmittance in the light absorption region of the 1 mm sample is detected by detecting the optical transmittance after blackening the sample. The conditions for blackening treatment are: under a hydrogen atmosphere, at a hydrogen pressure of 0.18 MPa and a temperature of 520 °C, for 68 h.

[0084] In Examples 1 to 7, by reasonably adding corresponding components and controlling the ratio of each component in the raw materials, the optical transmittance and bending strength performance of the glass are better. As can be seen from Table 1, the optical transmittance of the high-strength, high-transmittance and stray-light eliminating cover glass prepared in Examples 1 to 7 of the present invention is as follows: in the wavelength range of 400 to 1000 nm, the maximum transmittance ≥ 90.6%, and the minimum transmittance ≥ 86.6%. The comprehensive performance is superior to the glass involved in Comparative Examples 1 to 3, and at the same time, it has good acid / tide resistance stability and can maintain the stability of the internal structure of the glass for a long time.

[0085] As described above, the high-strength, high-transmittance and stray-light eliminating cover glass provided in Examples 1 to 7 of the present invention has excellent optical transmittance performance, high bending strength and good processing performance. This is because in Examples 1 to 7 of the present invention, the proportion of each component raw material is adjusted in the preparation of the high-strength, high-transmittance and stray-light eliminating cover glass, and the appropriate stirring speed and time are set. Therefore, the high-strength, high-transmittance and stray-light eliminating cover glass of the present invention has a high optical transmittance and a high bending strength, and has a broad application prospect.

[0086] The glass cover plate for a mobile phone camera prepared by using Example 1 is shown in Figure 3. It includes a light passing hole 1, a lens passing hole 2 and a stray light absorption region 3. The light passing hole 1 and the lens passing hole 2 are both light-transmitting effective regions formed by light-transmitting glass before blackening treatment, and the stray light absorption region 3 is a region where a light absorption layer is formed on the surface of the light-transmitting glass after blackening treatment.

[0087] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-strength, high-transmittance, stray light-eliminating cover glass, characterized in that: Calculated by mass percentage, it is composed of the following components: SiO2 55.0-66.0%, Al2O3 17.0-23.0%, B2O3 2.0-7.0%, Na2O10.0-15.0%, CaO 0-1.0%, MgO 1.5-3.0%, CeO2 0-3.0%, Bi2O3 0-5.0%; wherein the contents of Bi2O3 and CeO2 are not the same and are both 0.

2. The high-strength, high-transmittance, stray light-eliminating cover glass according to claim 1, characterized in that: The content of SiO2 is 55.0-65.0%, or 55.0-63.0%, or 55.0-58.0%, or 55.0-57.0%, or 55.0-56.5%, or 55.0-56.0%, or 58.0-63.0%, or 57.0-63.0%, or 56.5-63.0%, or 56.0-58.0%, or 58.0-65.0%, or 60-65.0%, or 56.5-57.9%, or 56.8-57.5%; Or, the content of Al2O3 is 17.0-22.0%, or 17.0-21.0%, or 17.0-20.5%, or 17.0-20.0%, or 17.0-19.0%, or 17.0-18.5%, or 17.0-18.0%, or 17.0-17.5%, or 17.5-22.0%, or 17.5-21.0%, or 17.5-20.5%, or 17.5-2 0.0%, or 17.5-19.0%, or 17.5-18.5%, or 18.0-22.0%, or 18.0-21.0%, or 18.0-20.5%, or 18.0-20.0%, or 18.0-19.0%, or 18.0-18.5%, or 19.0-22.0%, or 19.0-21.0%, or 19.0-20.5%, or 19.0-20.0%; Or, the content of B2O3 is 2.0-6.0%, or 2.0-5.5%, or 2.0-5.0%, or 2.0-4.5%, or 2.0-4.0%, or 2.0-3.5%, or 2.0-3.0%, or 3.0-6.0%, or 3.0-5.5%, or 3.0-5.0%, or 3.0-4.5%, or 3.0-4.0%, or 3.0-3.5%, or 3.5-6.0%, or 3.5-5.5%, or 3.5-5.0%, or 3.5-4.5%; Or, the content of Na2O is 11.0-15.0%, or 12.0-15.0%, or 12.5-15.0%, or 13.0-15.0%, or 13.5-15.0%, or 14.0-15.0%, or 11.0-14.5%, or 12.0-14.5%, or 11.0-14.0%, or 12.0-14.0%, or 12.5-13.5%; Or, the content of CaO is 0.1-1.0%, or 0.1-0.9%, or 0.1-0.8%, or 0.1-0.7%, or 0.1-0.6%, or 0.1-0.5%, or 0.1-0.4%; Or, the content of MgO is 1.5-2.5%, or 1.5-2.0%, or 1.5-1.8%, or 1.8-3.0%, or 1.8-2.5%, or 1.8-2.0%, or 2.0-3.0%, or 2.5-3.0%; Or, the content of Bi2O3 is 0.1-5.0%, or 0.1-4.5%, or 0.1-4.0%, or 0.1-3.6%, or 0.1-3.5%, or 0.1-3.0%, or 0.1-2.5%, or 0.1-2.0%, or 0.5-5.0%, or 0.5-4.5%, or 0.5-4.0%, or 0.5-3.6%, or 0.5-3.5%, or 0.5-3.0%, or 0.5-2.5%, or 0.5-2.0%, or 1.0- 5.0%, or 1.0-4.5%, or 1.0-4.0%, or 1.0-3.6%, or 1.0-3.5%, or 1.0-3.0%, or 1.0-2.5%, or 1.0-2.0%, or 1.2-5.0%, or 1.2-4.5%, or 1.2-4.0%, or 1.2-3.6%, or 1.2-3.5%, or 1.2-3.0%, or 1.2-2.5%, or 1.2-2.0%, or 2.0-3.0%, or 3.0-4.0%; Or, the content of CeO2 is 0.1-3.0%, or 0.1-2.5%, or 0.1-2.0%, or 0.1-1.5%, or 0.1-1.0%, or 0.1-0.5%, or 0.1-0.3%, or 0.5-3.0%, or 1.0-3.0%, or 1.5-3.0%, or 2.0-3.0%, or 2.5-3.0%; Or, the content of Bi2O3 is less than two-fifths of the content of B2O3.

3. The high-strength, high-transmittance, stray light-eliminating cover glass according to claim 1, characterized in that: The flexural strength is ≥125 MPa, preferably 125-134 MPa.

4. The high-strength, high-transmittance, stray light-eliminating cover glass according to claim 1, characterized in that: It includes a light-transmitting effective area and / or a light-absorbing area; when the thickness of the light-transmitting effective area is 2 mm, within the wavelength range of 400 to 1000 nm, the maximum transmittance is ≥90.6%, preferably 90.6 to 92.5%, and the minimum transmittance is ≥86.6%, preferably 86.6 to 88.8%; the maximum optical transmittance of the light-absorbing area is ≤1.6%, preferably 1.3 to 1.6%.

5. The high-strength, high-transmittance, stray light-eliminating cover glass according to claim 1, characterized in that: The thermal expansion coefficient in the temperature range of 20-300℃ is not higher than 77.7×10 -7 / ℃, preferably (74.8~76.1)×10 -7 / ℃; Alternatively, the softening point temperature is not higher than 883°C, preferably 861 to 883°C.

6. A method for preparing the high-strength, high-transmittance, stray light-eliminating cover glass according to claim 1, characterized in that: The steps include: The raw materials are mixed uniformly according to a proportion to obtain a mixture, and the mixture is melted, stirred, clarified and formed in sequence.

7. The method for preparing the high-strength, high-transmittance, stray light-eliminating cover glass according to claim 6, characterized in that: The melting temperature is 1600-1620°C; preferably, the melting time is 8-30h; Or, the stirring speed is 10-20 r / min, and the stirring time is 3-12 h; Alternatively, the molding temperature is 1570-1600° C., and the molding time is 5-25 min.

8. The method for preparing the high-strength, high-transmittance, stray light-eliminating cover glass according to claim 6, characterized in that: The formed blank is subjected to a blackening treatment; preferably, the blackening treatment is carried out under a reducing atmosphere, the blackening treatment time is 4000 to 16000 minutes, the pressure of the reducing gas is 0.01 to 0.5 MPa, and the temperature is 450 to 570°C; Preferably, the formed blank is annealed and then subjected to blackening treatment; further preferably, the annealing temperature is 500-620°C.

9. Use of the high-strength, high-transmittance, stray light-eliminating cover glass according to any one of claims 1 to 5 in the field of optics or intelligent technology.

10. The use according to claim 9, characterized in that: The high-strength, high-transmittance, stray-light-eliminating cover glass is used as an optical lens or an optical window; Alternatively, the high-strength and high-transmittance stray light-eliminating cover glass is used as the cover glass of a camera lens.

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