Optical glass and optical element

Abstract

The present application provides an optical glass, which contains, in terms of weight percentage, SiO2: 8-25%; B2O3: 8-25%; BaO: 30-50%; La2O3: 20-37%, wherein La2O3 / (SiO2+B2O3) is 0.5-2.0. Through reasonable component design, the optical glass obtained by the present application has a suitable thermal expansion coefficient, and meets the use of high-performance optical instruments.

Description

Technical Field

[0001] This invention relates to an optical glass, and more particularly to an optical glass with a suitable coefficient of thermal expansion. Background Technology

[0002] In recent years, the rapid development of digitalization and high precision in optical instruments has placed higher demands on the lightweighting and miniaturization of optical components used in various optical instruments, such as digital cameras, camcorders, projectors, and projection televisions. Optical glass with a refractive index of 1.64–1.74 and an Abbe number of 47–56 has the characteristics of high refractive index and moderate dispersion. When applied to optical imaging systems, it can improve the field of view of the lens and enhance image quality. Optical components made of optical glass also need to have a suitable coefficient of thermal expansion to withstand the impact of temperature changes and meet the requirements of chemical stability for long-term use in external environments. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an optical glass with a suitable coefficient of thermal expansion.

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

[0005] (1) Optical glass, the composition of which is expressed as a weight percentage, contains: SiO2: 8-25%; B2O3: 8-25%; BaO: 30-50%; La2O3: 20-37%, of which La2O3 / (SiO2+B2O3) is 0.5-2.0.

[0006] (2) The optical glass according to (1) further comprises, by weight percentage: Al2O3: 0-5%; and / or ZrO2: 0-5%; and / or Li2O: 0-5%; and / or SrO: 0-5%; and / or Y2O3: 0-5%; and / or clarifying agent: 0-0.5%, wherein the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

[0007] (3) Optical glass, the composition of which is expressed as a weight percentage, contains SiO2, B2O3, BaO and La2O3 as essential components, wherein the ratio of La2O3 / (SiO2+B2O3) is 0.5 to 2.0, and the refractive index n of the optical glass is... d The Abbe number ν ranges from 1.64 to 1.74. d The coefficient of thermal expansion is 47–56, and the coefficient of thermal expansion is α. 100 / 300℃ 80×10 -7 / K~120×10 -7 / K.

[0008] (4) The optical glass according to (3) comprises, by weight percentage: SiO2: 8-25%; and / or B2O3: 8-25%; and / or BaO: 30-50%; and / or La2O3: 20-37%; and / or Al2O3: 0-5%; and / or ZrO2: 0-5%; and / or Li2O: 0-5%; and / or SrO: 0-5%; and / or Y2O3: 0-5%; and / or clarifying agent: 0-0.5%, wherein the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

[0009] (5) The optical glass according to any one of (1) to (4) has components expressed as weight percentages that satisfy one or more of the following four conditions:

[0010] 1) The BaO / La2O3 ratio is 1.0 to 2.0, preferably 1.0 to 1.8, and more preferably 1.1 to 1.6;

[0011] 2) The ratio of La2O3 / (SiO2+B2O3) is 0.6 to 1.5, preferably 0.7 to 1.2;

[0012] 3) The ratio of B2O3 / (Al2O3+ZrO2) is 1.0 to 9.0, preferably 2.0 to 8.0, and more preferably 2.4 to 7.6;

[0013] 4) The ratio of SiO2 / (Al2O3+ZrO2+Li2O+SrO+Y2O3) is 1.0 to 8.0, with SiO2 / being preferred.

[0014] (Al2O3+ZrO2+Li2O+SrO+Y2O3) is 1.5~5.0, more preferably SiO2 /

[0015] (Al2O3+ZrO2+Li2O+SrO+Y2O3) is 2.1~4.5.

[0016] (6) The optical glass according to any one of (1) to (4), wherein the composition is expressed in weight percentage, wherein: SiO2: 10-20%, preferably SiO2: 13-17%; and / or B2O3: 10-21%, preferably B2O3: 12-16%; and / or BaO: 32-45%, preferably BaO: 34-41%; and / or La2O3: 22-35%, preferably La2O3: 24-31%; and / or Al2O3: 0.1-3%, preferably Al2O3 : 0.5-2%; and / or ZrO2: 0.1-3%, preferably ZrO2: 0.5-2%; and / or Li2O: 0-3%, preferably Li2O: 0-1%; and / or SrO: 0-3%, preferably SrO: 0-2%; and / or Y2O3: 0.1-3%, preferably Y2O3: 0.5-2%; and / or clarifying agent: 0-0.3%, preferably clarifying agent: 0-0.2%, wherein the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

[0017] (7) The optical glass according to any one of (1) to (4) has components expressed as weight percentages, wherein the total content of SiO2, B2O3, BaO and La2O3 is 90% or more, preferably 92% or more, and more preferably 94% or more.

[0018] (8) The optical glass according to any one of (1) to (4), wherein the composition, expressed as a weight percentage, further contains: Gd2O3+Ta2O5+Na2O+K2O+MgO+CaO: 0-5%, preferably

[0019] Gd2O3+Ta2O5+Na2O+K2O+MgO+CaO: 0-3%, more preferably Gd2O3+Ta2O5+Na2O+K2O+MgO+CaO: 0-1%.

[0020] (9) The refractive index n of the optical glass according to any one of (1) to (4) d The value is 1.64–1.74, preferably 1.66–1.72; Abbe number ν d The value is 47–56, preferably 49–54.

[0021] (10) The coefficient of thermal expansion α of the optical glass according to any one of (1) to (4) 100 / 300℃ 80×10 -7 / K~120×10 -7 / K, preferably 90×10 -7 / K~110×10 -7 / K; and / or water resistance stability DW It is classified into two or more categories, preferably one category; and / or the transition temperature T g The temperature is below 660°C, preferably below 640°C; and / or the density ρ is 4.50 g / cm³. 3 The preferred value is 4.40 g / cm³. 3 The following; and / or λ 80 The wavelength is 390 nm or less, preferably 380 nm or less; and / or the bubble density is grade A or higher, preferably grade A0 or higher, more preferably grade A. 00 Grade; and / or the temperature coefficient of refractive index dn / dt is 0 × 10⁻⁶. -6 Below / ℃, preferably -0.1×10 -6 Below / ℃, more preferably -0.5×10 -6 Below / ℃, and / or with anti-crystallization performance of grade C or above, preferably grade B or above, more preferably grade A.

[0022] (11) Glass preform, made of any of the optical glass described in (1) to (10).

[0023] (12) An optical element made of any of the optical glass described in (1) to (10), or made of the glass preform described in (11).

[0024] (13) An optical instrument containing any one of the optical glass described in (1) to (10), or containing the optical element described in (12).

[0025] The beneficial effects of this invention are: through reasonable component design, the optical glass obtained by this invention has a suitable coefficient of thermal expansion, which meets the requirements of high-performance optical instruments. Detailed Implementation

[0026] The embodiments of the optical glass of the present invention will now be described in detail. However, the present invention is not limited to the embodiments described below, and appropriate modifications can be made to implement it within the scope of the purpose of the present invention. Furthermore, regarding repeated descriptions, although there are appropriate omissions, this will not limit the spirit of the invention. In the following text, the optical glass of the present invention will sometimes be simply referred to as glass.

[0027] Optical Glass

[0028] The composition range of each component in the optical glass of the present invention will be described below. In the present invention, unless otherwise specified, the content of each component and the total content are all expressed as a weight percentage (wt%), that is, the weight percentage of the content of each component and the total content relative to the total amount of glass material converted into oxide composition. Here, "converted into oxide composition" means that when the oxides, complex salts, and hydroxides used as raw materials for the optical glass of the present invention decompose and transform into oxides upon melting, the total amount of such oxides is taken as 100%.

[0029] Unless otherwise specified in the specific context, the numerical ranges listed in this invention include upper and lower limits, and "above" and "below" include endpoint values ​​and all integers and fractions included in the range, but are not limited to the specific values ​​listed when the range is defined. The term "and / or" as used herein is inclusive; for example, "A and / or B" means only A, or only B, or both A and B.

[0030] <Essential and Optional Components>

[0031] SiO2 is a network-forming component of glass, playing a role in maintaining glass stability and providing suitable viscosity for molten glass forming. If the SiO2 content is too high, it will lead to a decrease in the glass's refractive index, high high-temperature viscosity, and poor melting performance; conversely, a low SiO2 content will result in poor resistance to crystallization and a tendency for streaks to appear. Therefore, the SiO2 content ranges from 8% to 25%, preferably 10% to 20%, and more preferably 13% to 17%.

[0032] B2O3 is a network-forming component of glass, playing a role in maintaining glass stability and improving its melting performance. However, excessively high B2O3 content leads to decreased chemical stability and reduced viscosity, increasing the difficulty of glass forming; conversely, low B2O3 content results in poor vitrification properties and resistance to crystallization, reducing production performance. Therefore, the B2O3 content ranges from 8% to 25%, preferably 10% to 21%, and more preferably 12% to 16%.

[0033] BaO, an alkaline earth metal oxide, can reduce the high-temperature viscosity of glass, improve its melting performance, and lower its refractive index temperature coefficient in this invention. However, when its content is high, the glass's resistance to crystallization and chemical stability deteriorate. Therefore, the BaO content is 30–50%, preferably 32–45%, and more preferably 34–41%.

[0034] In this invention, La2O3 increases the refractive index, which helps improve the transmittance of the glass in the visible light band and reduce the temperature coefficient of refractive index. However, when its content is too high, the glass's resistance to devitrification and chemical stability decrease, and the raw material cost of the glass increases. Therefore, the content of La2O3 is 20-37%, preferably 22-35%, and more preferably 24-31%.

[0035] In some embodiments, by controlling the ratio of BaO to La2O3 content (BaO / La2O3) to be below 2.0, the glass can have suitable viscosity and bubble density; however, if BaO / La2O3 is below 1.0, the temperature coefficient of refractive index and the coefficient of thermal expansion of the glass are difficult to meet design requirements. Therefore, it is preferable that BaO / La2O3 is 1.0 to 2.0, more preferably 1.0 to 1.8, and even more preferably 1.1 to 1.6.

[0036] In some embodiments, by controlling the ratio of La2O3 content to the total content of SiO2 and B2O3 (SiO2+B2O3), La2O3 / (SiO2+B2O3) is below 2.0, the anti-crystallization performance and colorimetric requirements of the glass can be guaranteed. However, if La2O3 / (SiO2+B2O3) is below 0.5, the refractive index, Abbe number, and coefficient of thermal expansion of the glass are difficult to meet the requirements. Therefore, it is preferable that La2O3 / (SiO2+B2O3) is 0.5 to 2.0, more preferably 0.6 to 1.5, and even more preferably 0.7 to 1.2.

[0037] In this invention, Al2O3 reduces the coefficient of thermal expansion of glass and improves its thermal stability. However, excessive Al2O3 content will lead to an increase in the glass transition temperature and a rise in the high-temperature viscosity of the glass, making it difficult to eliminate bubbles. Therefore, the Al2O3 content ranges from 0 to 5%, preferably from 0.1 to 3%, and more preferably from 0.5 to 2%.

[0038] ZrO2 can increase the refractive index of glass and regulate dispersion, while also adjusting the temperature coefficient of refractive index and reducing the coefficient of thermal expansion. However, excessive ZrO2 content can lead to an increase in the melting temperature of the glass, and the glass is prone to crystallization when the content exceeds 5%. Therefore, the ZrO2 content range is 0–5%, preferably 0.1–3%, and more preferably 0.5–2%.

[0039] In some embodiments, by controlling the ratio of B2O3 content to the total content of Al2O3 and ZrO2 (Al2O3+ZrO2), B2O3 / (Al2O3+ZrO2), to be below 9.0, the glass can have suitable density and melting properties. However, if B2O3 / (Al2O3+ZrO2) is below 1.0, the glass transition temperature and high-temperature viscosity are relatively high, bubbles are easily formed in the glass, and the stability of the glass decreases. Therefore, it is preferable that B2O3 / (Al2O3+ZrO2) is 1.0 to 9.0, more preferably 2.0 to 8.0, and even more preferably 2.4 to 7.6.

[0040] Li₂O is an alkali metal oxide with a strong fluxing effect, which is beneficial for increasing the content of other components that contribute to the strength of glass. Li₂O can also lower the glass transition temperature. However, excessive Li₂O content can lead to easy crystallization of the glass, which is detrimental to subsequent hot working and also negatively affects the chemical stability and coefficient of thermal expansion of the glass. Therefore, in this invention, the Li₂O content is 0–5%, preferably 0–3%, and more preferably 0–1%.

[0041] SrO can adjust the refractive index and Abbe number of glass, improving its melting performance. However, if its content is too high, the glass's resistance to crystallization decreases, and the cost of the glass also increases rapidly. Therefore, the SrO content is 0–5%, preferably 0–3%, and more preferably 0–2%.

[0042] In this invention, Y₂O₃ is a component that achieves high refractive index and low dispersion properties. By coexisting with La₂O₃, it can improve the glass's resistance to crystallization. However, a high Y₂O₃ content leads to a decrease in the glass's devitrification resistance and increases costs. Therefore, the Y₂O₃ content ranges from 0 to 5%, preferably 0.1 to 3%, and more preferably 0.5 to 2%.

[0043] In some embodiments, the ratio between the content of SiO2 and the total content of Al2O3+ZrO2+Li2O+SrO+Y2O3 is controlled by adjusting the content of SiO2 /

[0044] A SiO2 / (Al2O3+ZrO2+Li2O+SrO+Y2O3) ratio below 8.0 provides suitable chemical stability and a suitable coefficient of thermal expansion for the glass. However, if the SiO2 / (Al2O3+ZrO2+Li2O+SrO+Y2O3) ratio is below 1.0, the glass's resistance to crystallization and bubble formation deteriorates, and it becomes more prone to crystal formation. Therefore, a SiO2 / (Al2O3+ZrO2+Li2O+SrO+Y2O3) ratio is preferred.

[0045] (Al2O3+ZrO2+Li2O+SrO+Y2O3) is 1.0~8.0, more preferably SiO2 /

[0046] (Al2O3+ZrO2+Li2O+SrO+Y2O3) is 1.5~5.0, with further preference given to SiO2 /

[0047] (Al2O3+ZrO2+Li2O+SrO+Y2O3) is 2.1~4.5.

[0048] In this invention, the clarification effect of glass can be improved by using one or more of the following components containing 0-0.5% Sb₂O₃, SnO, SnO₂, and CeO₂ as a clarifying agent. Preferably, the content of the clarifying agent is 0-0.3%, more preferably 0-0.2%. When the content of Sb₂O₃ exceeds 0.5%, the clarification performance of the glass tends to decrease. At the same time, due to its strong oxidizing effect, it promotes the corrosion of platinum or platinum alloy vessels used for molten glass and the deterioration of the forming mold. Therefore, in this invention, the content of Sb₂O₃ is preferably 0-0.5%, more preferably 0-0.3%, and even more preferably 0-0.2%. SnO and SnO₂ can also be used as clarifying agents, but when their content exceeds 0.5%, the tendency of glass coloring increases, or when the glass is heated, softened, and re-formed such as by molding, Sn will become the starting point for crystal nucleation, resulting in a tendency for devitrification. Therefore, the SnO2 content of the present invention is preferably 0-0.5%, more preferably 0-0.3%, further preferably 0-0.2%, and even more preferably free of SnO2; the SnO content is preferably 0-0.5%, more preferably 0-0.3%, further preferably 0-0.2%, and even more preferably free of SnO. CeO2 has a similar function to SnO2, and its content is preferably 0-0.5%, more preferably 0-0.3%, further preferably 0-0.2%, and even more preferably free of CeO2.

[0049] In some embodiments of the present invention, in order to ensure that the optical glass meets the requirements for refractive index and Abbe number, has a suitable coefficient of thermal expansion and anti-crystallization properties, as well as excellent chemical stability and bubble content, it is preferable that the total content of SiO2, B2O3, BaO, and La2O3 is 90% or more, more preferably 92% or more, and even more preferably 94% or more.

[0050] Without affecting the glass properties of the present invention, one or more components selected from Gd2O3, Ta2O5, Na2O, K2O, MgO, and CaO may be appropriately included. The content of the above components individually or in total is preferably less than 5%, more preferably less than 3%, further preferably less than 1%, and even more preferably not included in the above components.

[0051] <Components that should not be present>

[0052] In the glass of this invention, even if oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo are contained in small amounts, either alone or in combination, the glass will be colored and absorb at specific wavelengths in the visible light region, thereby weakening the property of this invention to improve visible light transmittance. Therefore, it is preferable that the glass does not contain these oxides, especially for optical glass where transmittance in the visible light region is required.

[0053] Oxides of Th, Cd, Tl, Os, Be, and Se have been increasingly subject to controlled use in recent years due to their status as hazardous chemicals. Environmental protection measures are essential not only in glass manufacturing but also in processing and post-product disposal. Therefore, given the importance of environmental impact, it is preferable to avoid the presence of these substances, except where their contamination is unavoidable. As a result, the optical glass becomes virtually free of pollutants. Therefore, the optical glass of this invention can be manufactured, processed, and disposed of even without special environmental countermeasures.

[0054] To achieve environmental friendliness, the optical glass of the present invention preferably does not contain As2O3 and PbO.

[0055] The terms "not containing" and "0%" as used herein mean that the compound, molecule, or element was not intentionally added to the optical glass of this invention as a raw material; however, as raw materials and / or equipment for producing optical glass, there may be certain impurities or components that are not intentionally added, which may be present in small or trace amounts in the final optical glass, and such cases are also within the scope of protection of this patent.

[0056] The performance of the optical glass of the present invention will now be described.

[0057] <Refractive Index and Abbe Number>

[0058] The refractive index (n) of optical glass d ) and Abbe number (ν d Test according to the method specified in GB / T 7962.1—2010.

[0059] In some embodiments, the refractive index (n) of the optical glass of the present invention d The lower limit is 1.64, and the preferred lower limit is 1.66.

[0060] In some embodiments, the refractive index (n) of the optical glass of the present invention d The upper limit for () is 1.74, and the preferred upper limit is 1.72.

[0061] In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The lower limit is 47, and the preferred lower limit is 49.

[0062] In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The upper limit for ) is 56, and the preferred upper limit is 54.

[0063] Coefficient of thermal expansion

[0064] The coefficient of thermal expansion of optical glass (α) 100 / 300℃ Data were tested at 100–300°C according to the method specified in GB / T7962.16—2010.

[0065] In some embodiments, the coefficient of thermal expansion (α) of the optical glass of the present invention is... 100 / 300℃ ) is 80×10 -7 / K~120×10 -7 / K, preferably 90×10 -7 / K~110×10 -7 / K.

[0066] <Stability under water resistance>

[0067] Water resistance stability of optical glass (D) W (Powder method) Tested according to the method specified in GB / T 17129.

[0068] In some embodiments, the water resistance stability (D) of the optical glass of the present invention is... W There are two or more categories, with category 1 being preferred.

[0069] <Transition Temperature>

[0070] Transition temperature of optical glass (T) g The test shall be conducted in accordance with the method specified in GB / T7962.16—2010.

[0071] In some embodiments, the transition temperature (T) of the optical glass of the present invention is... g The temperature should be below 660℃, preferably below 640℃.

[0072] <Density>

[0073] Density (ρ) was tested according to the method specified in GB / T7962.20—2010.

[0074] In some embodiments, the density (ρ) of the optical glass of the present invention is 4.50 g / cm³. 3 The preferred value is 4.40 g / cm³. 3 the following.

[0075] <Colorization>

[0076] The short-wavelength transmission spectral characteristics of the glass of this invention are expressed using colorimetric intensity (λ). 80 ) represents. λ 80 This refers to the wavelength corresponding to a glass transmittance of 80%. λ 80 The measurement was performed using a glass with a thickness of 10 ± 0.1 mm and two optically polished, parallel planes. The spectral transmittance was measured in the wavelength range from 280 nm to 700 nm, and wavelengths exhibiting 80% transmittance were recorded. Spectroscopic transmittance, or transmittance, is the value of the light incident perpendicularly to the aforementioned surface of the glass with an intensity I... in Light passes through the glass and exits from a plane with an intensity of I. out In the case of light, through I out / I in The value represents the transmittance, which also includes the surface reflection loss on the aforementioned surfaces of the glass. The higher the refractive index of the glass, the greater the surface reflection loss. Therefore, in high-refractive-index glasses, λ... 80 A low value means that the glass itself has very little coloration and high light transmittance.

[0077] In some embodiments, the λ of the optical glass of the present invention 80 For wavelengths below 390nm, λ is preferred. 80 It is below 380nm.

[0078] <Effervescence>

[0079] The bubble content of optical glass shall be tested according to the method specified in GB / T7962.8—2010.

[0080] In some embodiments, the bubble degree of the optical glass of the present invention is grade A or above, preferably grade A0 or above, and more preferably grade A. 00 class.

[0081] <Temperature coefficient of refractive index>

[0082] The refractive index temperature coefficient (dn / dt) of optical glass was tested according to the method specified in GB / T 7962.4—2010, within the range of 20–40℃. -6 / ℃))

[0083] In some embodiments, the refractive index temperature coefficient (dn / dt) of the optical glass of the present invention is 0 × 10⁻⁶. -6 Below / ℃, preferably -0.1×10 -6 Below / ℃, more preferably -0.5×10 -6 / ℃ below.

[0084] Anti-crystallization properties

[0085] The resistance to crystallization of glass was tested using the following methods:

[0086] The glass sample was processed to a size of 20×20×10mm, polished on both sides, and then placed in a container at a temperature of T. g Hold the glass in a crystallization furnace at +200℃ for 30 minutes. After cooling, polish both surfaces. Judge the crystallization performance of the glass according to Table 1 below, with Grade A being the best and Grade E being the worst.

[0087] Table 1. Grading and Judgment Criteria for Anti-crystallization Performance

[0088] serial number level standard 1 A No visible crystal particles 2 B Visible crystal particles, few in number and dispersed. 3 C Large or densely packed small crystal particles are visible to the naked eye. 4 D Large and dense crystallized grains 5 E Complete crystallization and devitrification of glass

[0089] In some embodiments, the anti-crystallization performance of the optical glass of the present invention is grade C or above, preferably grade B or above, and more preferably grade A.

[0090] [Manufacturing methods for optical glass]

[0091] The manufacturing method of the optical glass of this invention is as follows: The glass of this invention is produced using conventional raw materials and processes, including but not limited to using salt raw materials (such as carbonates, nitrates, sulfates, etc.), hydroxides, oxides, boric acid, etc., as raw materials. After the raw materials are prepared according to conventional methods, the prepared furnace charge is put into a melting furnace (such as a platinum crucible, quartz crucible, etc.) at 1000-1400℃ for melting. After clarification, stirring, and homogenization, a homogeneous molten glass without bubbles and undissolved substances is obtained. This molten glass is then cast in a mold and annealed. Those skilled in the art can appropriately select raw materials, process methods, and process parameters according to actual needs.

[0092] [Glass preforms and optical components]

[0093] Glass preforms can be manufactured from the optical glass using methods such as grinding, hot pressing, or precision stamping. Specifically, glass preforms can be manufactured by machining the optical glass, such as grinding and polishing; or by hot pressing a preform made from the optical glass for molding and then grinding it; or by precision stamping a preform made from the ground glass.

[0094] It should be noted that the means of preparing the glass preform are not limited to those described above. As mentioned above, the optical glass of the present invention is useful for various optical components and optical designs, and it is particularly preferred to form a preform from the optical glass of the present invention, using the preform for re-hot pressing, precision stamping, etc., to manufacture optical components such as lenses and prisms.

[0095] Both the glass preform and the optical element of the present invention are formed from the optical glass described above. The glass preform of the present invention possesses the excellent properties of optical glass; the optical element of the present invention possesses the excellent properties of optical glass, and can provide various optical elements such as lenses and prisms with high optical value.

[0096] Examples of lenses include concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, plano-concave lenses, and so on, where the lens surface is spherical or aspherical.

[0097] [Optical Instruments]

[0098] The optical elements formed by the optical glass of this invention can be used to manufacture optical instruments such as photographic equipment, video equipment, display equipment, and monitoring equipment.

[0099] Example

[0100] <Example of Optical Glass>

[0101] To further illustrate and explain the technical solution of the present invention, the following non-limiting embodiments are provided.

[0102] In this embodiment, optical glass with the composition shown in Tables 2 and 3 was obtained using the optical glass manufacturing method described above. Furthermore, the properties of each glass were measured using the testing method described in this invention, and the measurement results are shown in Tables 2 and 3.

[0103] Table 2.

[0104] Example (wt%) 1# 2# 3# 4# 5# 6# 7# <![CDATA[SiO2]]> 16 13.8 15.77 15.92 16.07 15.87 15.62 <![CDATA[B2O3]]> 14 14.2 16 14.66 15.17 14 12.91 BaO 38 35.25 37.24 34 38.28 36.34 38.63 <![CDATA[La2O3]]> 26 31 25.9 28.89 24 27.89 28 <![CDATA[Al2O3]]> 4 1.99 1.3 1.67 1.21 1.82 0.91 <![CDATA[ZrO2]]> 1.8 1.77 1.53 1.82 1.71 1.28 0.92 <![CDATA[Li2O]]> 0.1 0.9 0.69 0.45 0.83 1 0.36 SrO 0 0.4 0.88 0.69 0.93 0.9 2 <![CDATA[Y2O3]]> 0 0.64 0.69 1.85 1.75 0.85 0.6 <![CDATA[Sb2O3]]> 0.1 0.05 0 0.05 0.05 0.05 0.05 <![CDATA[SnO2]]> 0 0 0 0 0 0 0 SnO 0 0 0 0 0 0 0 <![CDATA[CeO2]]> 0 0 0 0 0 0 0 total 100 100 100 100 100 100 100 <![CDATA[La2O3 / (SiO2+B2O3)]]> 0.87 1.11 0.82 0.94 0.77 0.93 0.98 <![CDATA[BaO / La2O3]]> 1.46 1.14 1.44 1.18 1.60 1.30 1.38 <![CDATA[SiO2 / (Al2O3+ZrO2+Li2O+SrO+Y2O3)]]> 2.71 2.42 3.10 2.46 2.50 2.71 3.26 <![CDATA[B2O3 / (Al2O3+ZrO2)]]> 2.41 3.78 5.65 4.20 5.20 4.52 7.05 <![CDATA[SiO2+B2O3+BaO+La2O3]]> 94 94.25 94.91 93.47 93.52 94.1 95.16 <![CDATA[n d ]]> 1.6985 1.6984 1.6628 1.7021 1.7105 1.6742 1.7022 <![CDATA[ν d ]]> 52.36 51.67 54.13 52.98 51.40 53.76 51.27 Anti-crystallization properties Grade A Grade A Grade A Grade A Grade A Grade A Grade A <![CDATA[D w ]]> Category 2 Class 1 Category 2 Class 1 Class 1 Class 1 Class 1 <![CDATA[dn / dt(×10 -6 / ℃)]]> -1.10 -1.45 -1.91 -1.53 -2.68 -0.81 -2.40 <![CDATA[ρ(g / cm 3 )]]> 4.24 4.27 4.30 4.23 4.31 4.33 4.21 Bubble density (grade) <![CDATA[A 00 ]]> <![CDATA[A 00 ]]> <![CDATA[A 00 ]]> <![CDATA[A 00 ]]> <![CDATA[A 00 ]]> <![CDATA[A 00 ]]> <![CDATA[A 00 ]]> <![CDATA[α 100 / 300℃ (×10 -7 / K)]]> 110 102 105 93 96 101 97 <![CDATA[T g (℃)]]> 620 623 627 625 635 631 617 <![CDATA[λ 80 (nm)]]> 377 365 362 371 364 367 378

[0105] Table 3.

[0106]

[0107]

[0108] <Example of Glass Prefabricated Components>

[0109] The glass obtained from optical glass Examples 1 to 14# is used, for example, by grinding, or by molding such as hot pressing or precision stamping, to produce preforms of various lenses and prisms such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses.

[0110] <Optical Component Examples>

[0111] Annealing these preforms obtained from the above glass preform examples reduces internal deformation of the glass while fine-tuning them so that optical properties such as refractive index reach the desired values.

[0112] Next, the prefabricated parts are ground and polished to produce various lenses and prisms, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. Anti-reflective coatings can also be applied to the surface of the resulting optical elements.

[0113] <Examples of Optical Instruments>

[0114] The optical elements obtained from the above-described optical element embodiments can be used, through optical design, to form optical components or optical assemblies by using one or more optical elements. They can be used in, for example, imaging devices, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / lighting in the automotive field, photolithography, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips, or for camera equipment and devices in the automotive field.

Claims

1. Optical glass, characterized in that, Its composition, expressed as a weight percentage, contains: SiO2: 8–25%; B2O3: 8–25%; BaO: 30–50%; La2O3: 24–37%, of which La2O3 / (SiO2+B2O3) is 0.87–1.5, B2O3 / (Al2O3+ZrO2) is 1.0–9.0, BaO / La2O3 is 1.1–1.52, and the Abbe number ν d The temperature coefficient of refractive index is 47–54.1, and the temperature coefficient of refractive index dn / dt is -2.53 × 10⁻⁶. -6 / ℃~0×10 -6 / ℃, bubble degree is A 00 class.

2. The optical glass according to claim 1, characterized in that, Its components, expressed as a weight percentage, also contain: Al2O3: 0–5%; and / or ZrO2: 0–5%; and / or Li2O: 0–5%; and / or SrO: 0–5%; and / or Y2O3: 0–5%; and / or clarifying agent: 0–0.5%, wherein the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

3. Optical glass, characterized in that, Its composition, expressed as a weight percentage, contains SiO2: 8–25%; B2O3: 8–25%; BaO: 30–50%; La2O3: 24–37%, wherein the ratio of La2O3 / (SiO2+B2O3) is 0.87–1.5, the ratio of B2O3 / (Al2O3+ZrO2) is 1.0–9.0, and the ratio of BaO / La2O3 is 1.1–1.

52. The refractive index n of the optical glass is... d The Abbe number ν ranges from 1.64 to 1.

74. d The coefficient of thermal expansion is 47–54.

1. 100 / 300℃ 80×10 -7 / K~120×10 -7 / K, the temperature coefficient of refractive index dn / dt is -2.53×10 -6 / ℃~0×10 -6 / ℃, bubble degree is A 00 class.

4. The optical glass according to claim 3, characterized in that, Its components are expressed as a weight percentage and contain: Al2O3: 0-5%; and / or ZrO2: 0-5%; and / or Li2O: 0-5%; and / or SrO: 0-5%; and / or Y2O3: 0-5%; and / or clarifying agent: 0-0.5%, wherein the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

5. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage and meet one or more of the following three conditions: 1) The ratio of La2O3 / (SiO2+B2O3) is 0.87 to 1.2; 2) The ratio of B2O3 / (Al2O3+ZrO2) is 2.0–8.0; 3) SiO2 / (Al2O3+ZrO2+Li2O+SrO+Y2O3) is 1.0~8.

0.

6. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as a weight percentage and satisfy one or both of the following two conditions: 1) The ratio of B2O3 / (Al2O3+ZrO2) is 2.4–7.6; 2) SiO2 / (Al2O3+ZrO2+Li2O+SrO+Y2O3) is 1.5~5.

0.

7. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition, expressed as a weight percentage, satisfies the following condition: SiO2 / (Al2O3+ZrO2+Li2O+SrO+Y2O3) is 2.1 to 4.

5.

8. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: SiO2: 10-20%; and / or B2O3: 10-21%; and / or BaO: 32-45%; and / or La2O3: 24-35%; and / or Al2O3: 0.1-3%; and / or ZrO2: 0.1-3%; and / or Li2O: 0-3%; and / or SrO: 0-3%; and / or Y2O3: 0.1-3%; and / or clarifying agent: 0-0.3%, wherein the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

9. The optical glass according to any one of claims 1 to 4, characterized in that, Its components are expressed as weight percentages, wherein: SiO2: 13-17%; and / or B2O3: 12-16%; and / or BaO: 34-41%; and / or La2O3: 24-31%; and / or Al2O3: 0.5-2%; and / or ZrO2: 0.5-2%; and / or Li2O: 0-1%; and / or SrO: 0-2%; and / or Y2O3: 0.5-2%; and / or clarifying agent: 0-0.2%, wherein the clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2.

10. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which the total content of SiO2, B2O3, BaO and La2O3 is more than 90%.

11. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which the total content of SiO2, B2O3, BaO and La2O3 is more than 92%.

12. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition is expressed as a weight percentage, of which the total content of SiO2, B2O3, BaO and La2O3 is more than 94%.

13. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition, expressed as a weight percentage, also contains: Gd2O3+Ta2O5+Na2O+K2O+MgO+CaO: 0~5%.

14. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition, expressed as a weight percentage, also contains: Gd2O3+Ta2O5+Na2O+K2O+MgO+CaO: 0~3%.

15. The optical glass according to any one of claims 1 to 4, characterized in that, Its composition, expressed as a weight percentage, also contains: Gd2O3+Ta2O5+Na2O+K2O+MgO+CaO: 0~1%.

16. The optical glass according to any one of claims 1 to 2, characterized in that, The refractive index n of the optical glass d The value ranges from 1.64 to 1.

74.

17. The optical glass according to any one of claims 1 to 4, characterized in that, The refractive index n of the optical glass d The Abbe number is 1.66–1.

72. d The range is 49 to 54.

18. The optical glass according to any one of claims 1 to 2, characterized in that, The coefficient of thermal expansion of the optical glass is α 100 / 300℃ 80×10 -7 / K~120×10 -7 / K.

19. The optical glass according to any one of claims 1 to 4, characterized in that, The coefficient of thermal expansion of the optical glass is α 100 / 300℃ 90×10 -7 / K~110×10 -7 / K; and / or water resistance stability D W Class 2 or above; and / or transition temperature T g Temperature below 660℃; and / or density ρ of 4.50 g / cm³ 3 The following; and / or λ 80 For wavelengths below 390 nm; and / or for refractive index temperature coefficients dn / dt of -2.53 × 10⁻⁶. -6 / ℃~-0.1×10 -6 / ℃; and / or anti-crystallization performance of grade C or above.

20. The optical glass according to any one of claims 1 to 4, characterized in that, The water resistance stability D of the optical glass W Class 1; and / or transition temperature T g Temperature below 640℃; and / or density ρ of 4.40 g / cm³ 3 The following; and / or λ 80 For wavelengths below 380 nm; and / or for refractive index temperature coefficients dn / dt of -2.53 × 10⁻⁶. -6 / ℃~-0.5×10 -6 / ℃, and / or anti-crystallization performance is Grade B or above.

21. The optical glass according to any one of claims 1 to 4, characterized in that, The optical glass has an anti-crystallization performance of Grade A.

22. A glass precast component, characterized in that, It is made of the optical glass described in any one of claims 1 to 21.

23. An optical element, characterized in that, It is made of optical glass as described in any one of claims 1 to 21, or of glass preform as described in claim 22.

24. An optical instrument, characterized in that, It contains the optical glass according to any one of claims 1 to 21, or the optical element according to claim 23.

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