CN110818250A - Optical glass - Google Patents
Optical glass Download PDFInfo
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- CN110818250A CN110818250A CN201911347305.9A CN201911347305A CN110818250A CN 110818250 A CN110818250 A CN 110818250A CN 201911347305 A CN201911347305 A CN 201911347305A CN 110818250 A CN110818250 A CN 110818250A
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- glass
- optical glass
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
- C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
Abstract
The invention provides optical glass, which comprises the following components in percentage by weight: SiO 22：35～60％；Al2O3: 15-30%; MgO: 5-20%; ZnO: 1 to 18% of (SiO)2+Al2O3) /(ZnO + MgO) is 1.5 to 6.0. The optical glass has the refractive index of 1.51-1.61, the Abbe number of 45-58, high elastic modulus and compressive strength and excellent chemical stability.
Description
Technical Field
The invention relates to optical glass, in particular to optical glass with a refractive index of 1.51-1.61 and an Abbe number of 45-58.
Background
With the increasing proportion of the marine industry in national economy, ocean development is continually expanding to depth and breadth. According to the definition of Chinese encyclopedia, deep sea refers to a marine environment below 200 m. Compared with the shallow sea environment, the deep sea environment has huge pressure and extreme temperature, pH value and biofouling problems, which present more challenges for various optical instruments applied in the marine environment, such as underwater imaging systems, underwater lighting systems, submarine observation windows, etc.
First, the optical glass must have a high transmittance to provide a clear image quality for the optical system. Secondly, the glass must have higher compressive strength to ensure that the optical instrument can work normally under the great pressure in deep sea. Third, the glass must have high chemical stability and not be severely eroded in weakly alkaline seawater, prolonging the life cycle of the optical instrument. In addition, the performance of glass against marine organism adhesion and the like also needs to be considered. This is a new topic that the development of the times puts forward to the optical design and the research of optical materials.
In the prior art, the optical glass with the refractive index of 1.51-1.61 and the Abbe number of 45-58 has the properties of chemical stability, elastic modulus and the like which are difficult to meet the use requirement in the marine environment, and is shown in Table 1 below. If an optical glass having excellent chemical stability, particularly excellent alkali resistance, and high elastic modulus can be developed, the problem of designing an optical system in the development of marine environments can be effectively solved.
TABLE 1 chemical stability and elastic modulus of optical glass with partial refractive index of 1.51-1.61 and Abbe number of 45-58
Disclosure of Invention
For the reasons, the technical problem to be solved by the invention is to provide an optical glass with a refractive index of 1.51-1.61 and an Abbe number of 45-58, which has a higher elastic modulus and excellent chemical stability.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the optical glass comprises the following components in percentage by weight: SiO 22：35～60％；Al2O3: 15-30%; MgO: 5-20%; ZnO: 1 to 18% of (SiO)2+Al2O3) /(ZnO + MgO) is 1.5 to 6.0.
Further, the optical glass comprises the following components in percentage by weight: TiO 22：0～8％；ZrO2：0～8％；CaO：0～10％；SrO：0～10％；BaO：0～10％；Li2O+K2O+Na2O: 0 to 5 percent; a clarifying agent: 0 to 1.5 percent.
Optical glass, the composition of which is expressed in weight percent and is made of SiO2：35～60％；Al2O3：15～30％；MgO：5～20％；ZnO：1～18％；TiO2：0～8％；ZrO2：0～8％；CaO：0～10％；SrO：0～10％；BaO：0～10％；Li2O+K2O+Na2O: 0 to 5 percent; a clarifying agent: 0 to 1.5% of a surfactant,wherein (SiO)2+Al2O3) /(ZnO + MgO) is 1.5 to 6.0.
Further, the optical glass comprises the following components in percentage by weight: SiO 22: 40-58%; and/or Al2O3: 18-28%; and/or MgO: 6-18%; and/or ZnO: 2-16%; and/or TiO2: 1-7%; and/or ZrO2: 0.1-6%; and/or CaO: 0-8%; and/or SrO: 0-8%; and/or BaO: 0-8%; and/or Li2O+K2O+Na2O: 0 to 4 percent; and/or a clarifying agent: 0.1 to 1.5 percent.
Further, the optical glass comprises the following components in percentage by weight: (SiO)2+Al2O3) /(ZnO + MgO) is 2.0 to 5.0, preferably (SiO)2+Al2O3) /(ZnO + MgO) is 2.5 to 4.5.
Further, the optical glass comprises the following components in percentage by weight: SiO 22/Al2O31.2 to 3.5, preferably SiO2/Al2O31.5 to 3.0, more preferably SiO2/Al2O31.6 to 2.5.
Further, the optical glass comprises the following components in percentage by weight: the ratio of MgO/ZnO is 0.3 to 4.0, preferably 0.35 to 3.5, and more preferably 0.4 to 3.0.
Further, the optical glass comprises the following components in percentage by weight: 8-30% of MgO + ZnO, preferably 10-28% of MgO + ZnO, and more preferably 12-25% of MgO + ZnO.
Further, the optical glass comprises the following components in percentage by weight: (SiO)2+Al2O3+ZnO+MgO)/(ZrO2+TiO2) Is 7.0 or more, preferably (SiO)2+Al2O3+ZnO+MgO)/(ZrO2+TiO2) Is 8.0 or more, more preferably (SiO)2+Al2O3+ZnO+MgO)/(ZrO2+TiO2) Is 9.0 or more.
Further, it is characterized byThe optical glass comprises the following components in percentage by weight: SiO 22: 45-55 percent; and/or Al2O3: 20-28%; and/or MgO: 8-15%; and/or ZnO: 5-15%; and/or TiO2: 2-6%; and/or ZrO2: 1-5%; and/or CaO: 0 to 5 percent; and/or SrO: 0 to 5 percent; and/or BaO: 0 to 5 percent; and/or Li2O+K2O+Na2O: 0 to 3 percent; and/or a clarifying agent: 0.1 to 1.3 percent.
Further, the refractive index n of the optical glassd1.51 to 1.61, preferably 1.53 to 1.59; abbe number vd45 to 58, preferably 48 to 56.
Further, the stability of the optical glass against water action DWIs 3 or more, preferably 2 or more, more preferably 1; and/or stability against acid action DAIs 3 or more, preferably 2 or more, more preferably 1; and/or stability against alkaline effects ASIs 3 or more, preferably 2 or more, and more preferably 1.
Further, the elastic modulus E of the optical glass is 8000 multiplied by 107Pa or more, preferably 8500X 107Pa or more, more preferably 9000X 107Pa or more, more preferably 9500X 107Pa is above; and/or the compressive strength P is 500MPa or more, preferably 600MPa or more, more preferably 700MPa or more, still more preferably 800MPa or more, and still more preferably 900MPa or more.
The glass preform is made of the optical glass.
And the optical element is made of the optical glass or the glass prefabricated member.
An optical device comprising the above optical glass or the above optical element.
The invention has the beneficial effects that: the refractive index of the optical glass obtained by the invention is 1.51-1.61, the Abbe number is 45-58, the optical glass has high elastic modulus, compressive strength and excellent chemical stability, can not generate obvious corrosion after long-term use, and is suitable for use in environments such as oceans and the like.
Detailed Description
The optical glass of the present invention is obtained by the following steps, which are not limited to the above-described embodiments, and can be appropriately modified within the scope of the object of the present invention. Note that, although the description of the duplicate description may be appropriately omitted, the gist of the invention is not limited to this. The optical glass of the present invention may be simply referred to as glass in the following.
[ optical glass ]
The ranges of the respective components of the optical glass of the present invention are explained below. In the present specification, the contents of the respective components are all expressed in terms of weight percentage with respect to the total amount of glass matter converted into the composition of oxides, if not specifically stated. Here, the "composition converted to oxides" means that when oxides, complex salts, hydroxides, and the like used as raw materials of the optical glass composition component (component) of the present invention are decomposed in the melt and converted to oxides, the total amount of the oxides is 100%.
Unless otherwise indicated herein, the numerical ranges set forth herein include upper and lower values, and the terms "above" and "below" include the endpoints, and all integers and fractions within the range, and are not limited to the specific values listed in the defined range. The term "and/or" as used herein is inclusive, e.g., "a; and/or B "means A alone, B alone, or both A and B.
< essential Components and optional Components >
SiO2The glass is a network former which forms the glass of the invention, is the basis for forming the glass, and the content of the glass is closely related to key indexes of the glass, such as chemical stability, mechanical strength, refractive index, Abbe number and the like. Wherein if SiO2At a content exceeding 60%, the glass becomes difficult to melt and clarification becomes difficult; if SiO2Less than 35%, the chemical stability of the glass is reduced. Thus, SiO2The content of (B) is 35 to 60%, preferably 40 to 58%, more preferably 45 to 55%.
Al2O3The addition of the Al into the glass can improve the thermal stability and the chemical stability of the glass, enhance the elastic modulus and the hardness of the glass and improve the mechanical strength of the glass, and more than 15 percent of Al is introduced into the glass2O3To obtain the above effects, it is preferable to introduce 18% or more of Al2O3More preferably, 20% or more of Al is introduced2O3. Due to Al2O3High melting point and high surface tension, if Al2O3When the content exceeds 30%, the viscosity of the glass increases and bubbles are hardly eliminated, so that Al2O3The content of (b) is limited to 30% or less, preferably 28% or less.
SiO2And Al2O3The relative content of (A) will determine the structure of the glass to a certain extent, and has a great influence on chemical stability, mechanical strength and the like when SiO2/Al2O3When the viscosity is more than 3.5, the high-temperature viscosity of the glass is high, which is not beneficial to production; when SiO is present2/Al2O3When the glass content is less than 1.2, the mechanical strength of the glass is lowered, and the glass cannot meet the requirements for use in deep sea environments. Thus, SiO2/Al2O3The value of (b) is limited to 1.2 to 3.5, preferably 1.5 to 3.0, and more preferably 1.6 to 2.5.
BaO, CaO, SrO and MgO are alkaline earth metal oxides, and when the BaO, the CaO, the SrO and the MgO are added into glass, the refractive index and the dispersion of the glass can be adjusted, the stability of the glass is enhanced, and the high-temperature viscosity of the glass is reduced. The common technical literature recognizes that the role of oxides of the same family in such glasses is essentially the same. However, the inventors have found through extensive experimental studies that the effects of the above alkaline earth metal oxides are greatly different from each other in terms of the most important elastic modulus, chemical stability, etc. of the glass of the present invention.
BaO is the weakest in its ability to increase the elastic modulus of the glass, and its content is limited to 10% or less, preferably 8% or less, and more preferably 5% or less.
SrO has the capability of increasing the elastic modulus of glass more than BaO but less than CaO, the capability of destroying the chemical stability of the glass is less than BaO when the SrO is added into the glass, and if the content of the SrO exceeds 10 percent, the devitrification resistance of the glass is rapidly deteriorated, so that the SrO content is 0-10 percent, preferably 0-8 percent, and more preferably 0-5 percent.
In the system glass of the invention, the capability of increasing the elastic modulus of the glass by CaO is higher than that of BaO and SrO, the elastic modulus of the glass is increased by introducing CaO with the content of less than 10 percent, the content of CaO is preferably 0 to 8 percent, and the content of CaO is more preferably 0 to 5 percent.
MgO is advantageous for the glass of the present invention system in rapidly increasing the elastic modulus of the glass and is compatible with SiO2、Al2O3Forming a magnesium-aluminum-silicon ternary system to form a network similar to a spinel structure, and improving the chemical stability and mechanical strength of the glass. If the content of MgO exceeds 20%, the glass is difficult to melt and is liable to crystallize during molding; if the content is less than 5%, a network of a nearly spinel structure cannot be formed. Therefore, the MgO content is 5 to 20%, preferably 6 to 18%, and more preferably 8 to 15%.
For the glass of the system, ZnO is added into the glass, so that the chemical stability of the glass can be improved, the high-temperature viscosity of the glass is reduced, and the production difficulty of the glass is reduced, wherein the effect is achieved by introducing more than 1% of ZnO. However, the inventors have studied and found that when the content of ZnO exceeds 18%, the elastic modulus of the glass decreases. Therefore, the content of ZnO is limited to 1 to 18%, preferably 2 to 16% or less, and more preferably 5 to 15%.
The inventor researches and discovers that when ZnO and MgO metal oxides are added, the glass generates complex synergistic effect, and the performance does not change linearly with the addition of a single substance. In some embodiments, when the value of MgO/ZnO exceeds 4.0, the high temperature viscosity of the glass rapidly increases although the chemical stability of the glass may be somewhat improved; when the MgO/ZnO value is less than 0.3, the elastic modulus of the glass decreases. Therefore, in the present invention, the value of MgO/ZnO is preferably 0.3 to 4.0, more preferably 0.35 to 3.5, and still more preferably 0.4 to 3.0.
Further, in the present glass, in order to obtain more excellent chemical stability, the content of MgO + ZnO is preferably limited to 8 to 30%, more preferably 10 to 28%, and still more preferably 12 to 25%.
Li2O、K2O、Na2O belongs to alkali metal oxide, and the addition of proper amount can reduce the forming difficulty of the glass and reduce crystallization, but the chemical stability and elastic modulus of the glass can be rapidly reduced. Thus Li2O+K2O+Na2The O content is limited to 5% or less, preferably 4% or less, more preferably 3% or less, and further preferably not added.
ZrO2The addition of a proper amount of the glass into the glass can improve the devitrification resistance of the glass and the chemical stability of the glass. More importantly, a proper amount of ZrO is added2The corrosion of molten glass to refractory materials in the production process can be reduced, on one hand, the service life of the furnace body can be prolonged, the maintenance cost of the furnace body is reduced, the waste discharge is reduced, on the other hand, impurities in the refractory materials can be obviously inhibited from entering the glass, and the transmittance and the anti-crystallization stability of the glass are improved. However, ZrO2Is high, and if the content exceeds 8%, the glass becomes very difficult to melt and the devitrification resistance is rapidly lowered, so that ZrO in the present invention2The content is limited to 8% or less. In some embodiments, if ZrO2The content of (A) is less than 0.1%, and the corrosion of the glass to the refractory material is obviously increased. Thus, ZrO in the invention2The content is preferably 0.1 to 8%, more preferably 0.1 to 6%, and further preferably 1 to 5%.
Appropriate amount of TiO2When the glass is added into glass, the density and the high-temperature viscosity of the glass can be reduced, the clarification and the elimination of stripes of the glass are facilitated, the optical uniformity of the glass is improved, and further the mechanical strength of the glass is improved, which is particularly important for ensuring the safety of an optical system in a marine environment. After extensive experimental research, the inventor finds that if TiO2The content of (b) exceeds 8%, and the devitrification resistance of the glass is drastically lowered, so that the content thereof is 0 to 8%, preferably 1 to 7%, more preferably 2 to 6%.
For the glass of the system of the invention, SiO2、Al2O3The ratio of the total value of (A) to the total value of ZnO and MgO, the chemical stability of the glass, and the elastic modulusThe amount and mechanical strength are strongly related. When (SiO)2+Al2O3) When the value of (ZnO + MgO) is more than 6.0, the elastic modulus of the glass does not rise any more, but the high-temperature viscosity of the glass rises rapidly; when (SiO)2+Al2O3) When the ratio of ZnO + MgO is less than 1.5, the chemical stability and the elastic modulus of the glass rapidly decrease. Therefore, to obtain a glass having a suitable high-temperature viscosity, excellent chemical stability and a high elastic modulus, (SiO)2+Al2O3) The value of (ZnO + MgO) is limited to 1.5 to 6.0, preferably 2.0 to 5.0, and more preferably 2.5 to 4.5.
In some embodiments of the invention, (SiO)2+Al2O3+ZnO+MgO)/(ZrO2+TiO2) When the value of (A) is less than 7.0, the devitrification resistance of the glass is drastically lowered and it is difficult to meet the design requirements. Thus, (SiO)2+Al2O3+ZnO+MgO)/(ZrO2+TiO2) The value of (b) is 7.0 or more, preferably 8.0 or more, and more preferably 9.0 or more.
In the invention, 0-1.5% of Sb is added2O3、SnO2SnO and CeO2One or more components in the glass can be used as a clarifying agent to improve the clarifying effect of the glass, and 0.1-1.5% of the clarifying agent is preferably added, more preferably 0.1-1.4% of the clarifying agent is added, and further preferably 0.1-1.3% of the clarifying agent is added.
< component which should not be contained >
In the glass of the present invention, even when a small amount of oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo is contained singly or in combination, the glass is colored and absorbs at a specific wavelength in the visible light region, thereby impairing the property of the present invention to improve the effect of visible light transmittance.
In recent years, oxides of Th, Cd, Tl, Os, Be, and Se tend to Be used as harmful chemical substances in a controlled manner, and measures for protecting the environment are required not only in the glass production process but also in the processing process and disposal after commercialization. Therefore, when importance is attached to the influence on the environment, it is preferable that these components are not substantially contained except for inevitable mixing. Thereby, the optical glass becomes practically free from substances contaminating the environment. Therefore, the optical glass of the present invention can be manufactured, processed, and discarded without taking special measures for environmental countermeasures.
In order to achieve environmental friendliness, the optical glass of the present invention does not contain As2O3And PbO. Although As2O3Has the effects of eliminating bubbles and better preventing the glass from coloring, but As2O3The addition of (b) increases the platinum attack of the glass on the furnace, particularly on the platinum furnace, resulting in more platinum ions entering the glass, which adversely affects the service life of the platinum furnace. PbO can significantly improve the high-refractivity and high-dispersion properties of the glass, but PbO and As2O3All cause environmental pollution.
The "no incorporation", "no inclusion", "no addition" and "0%" described herein mean that the compound, molecule, element or the like is not intentionally added as a raw material to the optical glass of the present invention; however, it is within the scope of the present invention that certain impurities or components which are not intentionally added may be present as raw materials and/or equipment for producing the optical glass and may be contained in the final optical glass in small or trace amounts.
The performance of the optical glass of the present invention will be described below.
< refractive index and Abbe number >
Refractive index (n) of optical glassd) And Abbe number (v)d) The test was carried out according to the method specified in GB/T7962.1-2010.
Refractive index (n) of the optical glass of the present inventiond) 1.51 to 1.61, preferably 1.53 to 1.59; abbe number (v)d) 45 to 58, preferably 48 to 56.
< stability against Water action >
Stability of optical glass to Water action (D)W) (powder method) the test was carried out according to the method prescribed in GB/T17129.
Stability to Water action of the optical glass of the invention (D)W) Is 3 or more, preferably 2 or more, and more preferably 1.
< stability against acid Effect >
Stability of acid resistance of optical glass (D)A) (powder method) the test was carried out according to the method prescribed in GB/T17129.
Stability of acid resistance of the optical glass of the present invention (D)A) Is 3 or more, preferably 2 or more, and more preferably 1.
< stability of alkali resistance action >
Stability of alkali resistance of optical glass (A)S) The test was carried out according to the method specified in GB/T7962.21-2019.
Stability of alkali resistance of the optical glass of the invention (A)S) Is 3 or more, preferably 2 or more, and more preferably 1.
< elastic modulus >
The modulus of elasticity (E) of the optical glass was measured according to the method specified in GB/T7962.6-2010.
The elastic modulus (E) of the optical glass of the present invention is 8000X 107Pa or more, preferably 8500X 107Pa or more, more preferably 9000X 107Pa or more, more preferably 9500X 107Pa or above.
< compressive Strength >
The compressive strength (P) of the optical glass was measured according to the method specified in GB/T8489-2006.
The compressive strength (P) of the optical glass of the present invention is 500MPa or more, preferably 600MPa or more, more preferably 700MPa or more, still more preferably 800MPa or more, and still more preferably 900MPa or more.
< resistance to crystallization >
The method for testing the anti-devitrification performance of the optical glass comprises the following steps: cutting the sample glass into a size of 20mm × 20mm × 10mm, and placing at a temperature TgKeeping the temperature in a muffle furnace at +230 ℃ for 30 minutes, taking out the muffle furnace, putting the muffle furnace into heat-preservation cotton, slowly cooling the muffle furnace, and observing the surface crystallization condition after cooling. If the glass sample has no obvious crystallization, the crystallization resistance of the glass is excellent.
[ production method ]
The method for manufacturing the optical glass comprises the following steps: the glass is produced by adopting conventional raw materials and conventional processes, carbonate, nitrate, sulfate, hydroxide, oxide and the like are used as raw materials, the materials are mixed according to a conventional method, the mixed furnace burden is put into a smelting furnace at 1550-1650 ℃ for smelting, and the homogeneous molten glass without bubbles and undissolved substances is obtained after clarification, stirring and homogenization, and the homogeneous molten glass is cast in a mould and annealed. Those skilled in the art can appropriately select the raw materials, the process method and the process parameters according to the actual needs.
Glass preform and optical element
The glass preform can be produced from the optical glass produced by, for example, grinding or press molding such as reheat press molding or precision press molding. That is, the glass preform may be produced by machining the optical glass by grinding, polishing, or the like, or by producing a preform for press molding from the optical glass, subjecting the preform to reheat press molding, and then polishing, or by precision press molding the preform obtained by polishing.
It should be noted that the means for producing the glass preform is not limited to the above means. As described above, the optical glass of the present invention is useful for various optical elements and optical designs, and among them, it is particularly preferable to form a preform from the optical glass of the present invention, and use the preform for reheat press forming, precision press forming, or the like to produce optical elements such as lenses, prisms, or the like.
The glass preform of the present invention and the optical element are each formed of the above-described optical glass of the present invention. The glass preform of the present invention has excellent characteristics possessed by optical glass; the optical element of the present invention has excellent characteristics of optical glass, and can provide optical elements such as various lenses and prisms having high optical values.
Examples of the lens include various lenses such as a concave meniscus lens, a convex meniscus lens, a double convex lens, a double concave lens, a plano-convex lens, and a plano-concave lens, each of which has a spherical or aspherical lens surface.
[ optical instruments ]
The optical element formed by the optical glass can be used for manufacturing optical instruments such as photographic equipment, vehicle-mounted equipment, camera equipment, display equipment, monitoring equipment and the like.
The optical glass has excellent chemical stability, high compression strength and other performances, and is particularly suitable for being applied to the fields of marine environment and the like.
Examples
< example of optical glass >
In order to further clarify the explanation and explanation of the technical solution of the present invention, the following non-limiting examples are provided.
In this example, optical glasses having optical glass compositions shown in tables 2 to 3 were obtained by the above-mentioned method for producing optical glasses. The characteristics of each glass were measured by the test method described in the present invention, and the measurement results are shown in tables 2 to 3. In tables 2 to 3, SiO2/Al2O3Is denoted by K1; the value of MgO/ZnO is expressed as K2; the total amount of MgO + ZnO is represented by K3; (SiO)2+Al2O3) The value of (ZnO + MgO) is represented by K4; (SiO)2+Al2O3+ZnO+MgO)/(ZrO2+TiO2) Is denoted by K5. In the test of the crystallization resistance, no obvious crystallization is marked as 'A', and obvious crystallization is marked as 'B'.
TABLE 2
TABLE 3
< glass preform example >
Various lenses such as a concave meniscus lens, a convex meniscus lens, a biconvex lens, a biconcave lens, a plano-convex lens and a plano-concave lens, and preforms such as prisms were produced from the glasses obtained in examples 1 to 20 of optical glass by means of polishing or press molding such as reheat press molding and precision press molding.
< optical element example >
The preforms obtained in the above examples of glass preforms were annealed to reduce the deformation in the glass and to fine-tune the optical properties such as refractive index to desired values.
Next, each preform is ground and polished to produce various lenses such as a concave meniscus lens, a convex meniscus lens, a biconvex lens, a biconcave lens, a plano-convex lens, and a plano-concave lens, and prisms. The surface of the resulting optical element may be coated with an antireflection film.
< optical Instrument example >
The optical element produced by the above-described optical element embodiment can be used, for example, for imaging apparatuses, sensors, microscopes, medical technologies, digital projection, communications, optical communication technologies/information transmission, optics/illumination in the automotive field, photolithography, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips, or for image pickup apparatuses and devices in the marine field, by forming an optical component or optical assembly by using one or more optical elements through optical design.
Claims (16)
1. Optical glass, characterized in that its components, expressed in weight percent, contain: SiO 22：35～60％；Al2O3: 15-30%; MgO: 5-20%; ZnO: 1 to 18% of (SiO)2+Al2O3) /(ZnO + MgO) is 1.5 to 6.0.
2. The optical glass according to claim 1, wherein the composition further comprises, in weight percent: tiO2：0～8％；ZrO2：0～8％；CaO：0～10％；SrO：0～10％；BaO：0～10％；Li2O+K2O+Na2O: 0 to 5 percent; a clarifying agent: 0 to 1.5 percent.
3. Optical glass, characterized in that its composition, expressed in weight percentage, is represented by SiO2：35～60％；Al2O3：15～30％；MgO：5～20％；ZnO：1～18％；TiO2：0～8％；ZrO2：0～8％；CaO：0～10％；SrO：0～10％；BaO：0～10％；Li2O+K2O+Na2O: 0 to 5 percent; a clarifying agent: 0 to 1.5% of a component of (SiO)2+Al2O3) /(ZnO + MgO) is 1.5 to 6.0.
4. An optical glass according to any one of claims 1 to 3, characterised in that it comprises, in percentages by weight: SiO 22: 40-58%; and/or Al2O3: 18-28%; and/or MgO: 6-18%; and/or ZnO: 2-16%; and/or TiO2: 1-7%; and/or ZrO2: 0.1-6%; and/or CaO: 0-8%; and/or SrO: 0-8%; and/or BaO: 0-8%; and/or Li2O+K2O+Na2O: 0 to 4 percent; and/or a clarifying agent: 0.1 to 1.5 percent.
5. An optical glass according to any one of claims 1 to 3, characterised in that it comprises, in percentages by weight: (SiO)2+Al2O3) /(ZnO + MgO) is 2.0 to 5.0, preferably (SiO)2+Al2O3) /(ZnO + MgO) is 2.5 to 4.5.
6. An optical glass according to any one of claims 1 to 3, characterised in that it comprises, in percentages by weight: SiO 22/Al2O31.2 to 3.5, preferably SiO2/Al2O31.5 to 3.0, more preferably SiO2/Al2O31.6 to 2.5.
7. An optical glass according to any one of claims 1 to 3, characterised in that it comprises, in percentages by weight: the ratio of MgO/ZnO is 0.3 to 4.0, preferably 0.35 to 3.5, and more preferably 0.4 to 3.0.
8. An optical glass according to any one of claims 1 to 3, characterised in that it comprises, in percentages by weight: 8-30% of MgO + ZnO, preferably 10-28% of MgO + ZnO, and more preferably 12-25% of MgO + ZnO.
9. An optical glass according to any one of claims 1 to 3, characterised in that it comprises, in percentages by weight: (SiO)2+Al2O3+ZnO+MgO)/(ZrO2+TiO2) Is 7.0 or more, preferably (SiO)2+Al2O3+ZnO+MgO)/(ZrO2+TiO2) Is 8.0 or more, more preferably (SiO)2+Al2O3+ZnO+MgO)/(ZrO2+TiO2) Is 9.0 or more.
10. An optical glass according to any one of claims 1 to 3, characterised in that it comprises, in percentages by weight: SiO 22: 45-55 percent; and/or Al2O3: 20-28%; and/or MgO: 8-15%; and/or ZnO: 5-15%; and/or TiO2: 2-6%; and/or ZrO2: 1-5%; and/or CaO: 0 to 5 percent; and/or SrO: 0 to 5 percent; and/or BaO: 0 to 5 percent; and/or Li2O+K2O+Na2O: 0 to 3 percent; and/or a clarifying agent: 0.1 to 1.3 percent.
11. An optical glass according to any one of claims 1 to 3, wherein the refractive index n of the optical glassd1.51 to 1.61, preferably 1.53 to 1.59; abbe numberνd45 to 58, preferably 48 to 56.
12. The optical glass according to any one of claims 1 to 3, wherein the optical glass has a stability to water action DWIs 3 or more, preferably 2 or more, more preferably 1; and/or stability against acid action DAIs 3 or more, preferably 2 or more, more preferably 1; and/or stability against alkaline effects ASIs 3 or more, preferably 2 or more, and more preferably 1.
13. An optical glass according to any one of claims 1 to 3, wherein the optical glass has an elastic modulus E of 8000X 107Pa or more, preferably 8500X 107Pa or more, more preferably 9000X 107Pa or more, more preferably 9500X 107Pa is above; and/or the compressive strength P is 500MPa or more, preferably 600MPa or more, more preferably 700MPa or more, still more preferably 800MPa or more, and still more preferably 900MPa or more.
14. A glass preform made of the optical glass according to any one of claims 1 to 13.
15. An optical element produced from the optical glass according to any one of claims 1 to 13 or the glass preform according to claim 14.
16. An optical device comprising the optical glass according to any one of claims 1 to 13 or the optical element according to claim 15.
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| CN201911347305.9A CN110818250B (en) | 2019-12-24 | 2019-12-24 | Optical glass |
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| CN201911347305.9A CN110818250B (en) | 2019-12-24 | 2019-12-24 | Optical glass |
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| CN110818250B (en) | 2022-02-01 |
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