CN113415990A - Optical glass, glass preform, optical element and optical instrument - Google Patents

Optical glass, glass preform, optical element and optical instrument Download PDF

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Publication number
CN113415990A
CN113415990A CN202110856394.0A CN202110856394A CN113415990A CN 113415990 A CN113415990 A CN 113415990A CN 202110856394 A CN202110856394 A CN 202110856394A CN 113415990 A CN113415990 A CN 113415990A
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Prior art keywords
glass
optical
optical glass
sio
percent
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蔡冬雪
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CDGM Glass Co Ltd
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CDGM Glass Co Ltd
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Publication of CN113415990A publication Critical patent/CN113415990A/en
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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
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
    • 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

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

The invention provides an optical glass, which comprises the following components in percentage by weight: SiO 22：2～25％；B2O3：12～40％；Al2O3：2～20％；Ln2O3: 30-65%; and (3) RO: 0 to 15% of refractive index n of optical glassdIs 1.66 or more, (SiO)2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is 0.6 to 3.0, Ln2O3Is La2O3、Y2O3、Gd2O3The total content of RO is the total content of MgO, CaO, SrO and BaO. The refractive index of the optical glass obtained by the invention is more than 1.66, the Abbe number is more than 50, the processability and the chemical durability are obviously superior to those of the prior art, the transmittance can not be obviously reduced after long-term use, and the optical glass is very suitable for being used by an outdoor monitoring camera and a vehicle-mounted lens, and is particularly suitable for being used in an outdoor monitoring camera and a vehicle-mounted lensAre particularly suitable for imaging applications that require resistance to harsh operating environments.

Description

Optical glass, glass preform, optical element and optical instrument
Technical Field
The invention relates to optical glass, in particular to optical glass, a glass prefabricated member prepared from the optical glass, an optical element and an optical instrument.
Background
In recent years, with the development of digital camera devices, image pickup devices, projection devices, and in-vehicle devices, etc., the demand for optical elements has been increasing, and development and production of optical glasses with higher performance have been demanded. In the optical glass for manufacturing optical elements, particularly, the market demand for medium refractive index low dispersion optical glass which can correct chromatic aberration and miniaturize an optical system, has a refractive index of more than 1.66 and an abbe number of more than 50 is increasing.
From the prior art, has medium refractionThe lanthanum crown optical glass with low dispersion mainly adopts B2O3-La2O3Systems, however, from these B2O3-La2O3The glass having the above-mentioned system structure is often susceptible to water or acid in terms of the characteristics of the glass components generally used, and the durability is insufficient, so that the glass may be deteriorated in the polishing process and the production process yield may be low. In addition, since a monitoring camera, an in-vehicle camera, and the like, which are increasingly demanded in recent years, are often used outdoors, the conventional glass image pickup element is often exposed to weather or dust, and durability of glass is difficult to be required in the case of long-term use. Therefore, the improvement of the processability and durability of lanthanum crown optical glass with medium refractive index and low dispersion has been the focus of attention and is the focus of research.
Disclosure of Invention
The invention aims to provide optical glass with a refractive index of 1.66 or more, an Abbe number of more than 50, excellent chemical durability and good processability.
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 22：2～25％；B2O3：12～40％；Al2O3：2～20％；Ln2O3: 30-65%; and (3) RO: 0 to 15%, refractive index n of the optical glassdIs 1.66 or more, wherein (SiO)2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is 0.6 to 3.0, the Ln2O3Is La2O3、Y2O3、Gd2O3The total content of RO is the total content of MgO, CaO, SrO and BaO.
Further, the optical glass comprises the following components in percentage by weight: zr02: 0 to 5 percent; and/or Ta2O5: 0 to 5 percent; and/or Nb2O5: 0 to 5 percent; and/or ZnO: 0 to 10 percent; and/or Rn20: 0 to 5 percent; and/or a clarifying agent: 0 to 1%, of the total amount of Rn20 is Li2O、Na2O、K2One or more of O and Sb as clarifier2O3、SnO2SnO and CeO2One or more of (a).
Further, the optical glass comprises the following components in percentage by weight: (SiO)2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is 0.8 to 2.5, preferably (SiO)2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is 1.0 to 2.0, more preferably (SiO)2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is 1.2 to 1.8.
Further, the optical glass comprises the following components in percentage by weight: (SiO)2+Al2O3)/B2O30.2 to 2.5, preferably (SiO)2+Al2O3)/B2O30.3 to 2.0, more preferably (SiO)2+Al2O3)/B2O30.4 to 1.5, and more preferably (SiO)2+Al2O3)/B2O30.5 to 0.8.
Further, the optical glass comprises the following components in percentage by weight: al (Al)2O3/Ln2O30.05 to 0.5, preferably Al2O3/Ln2O30.08 to 0.4, more preferably Al2O3/Ln2O30.1 to 0.3.
Further, the optical glass comprises the following components in percentage by weight: ln2O3The ratio of/RO is 10.0 or more, preferably Ln2O3/RO is 15.0 or more, more preferably Ln2O3The ratio of/RO is 20.0 or more.
Further, the optical glass comprises the following components in percentage by weight: SiO 22: 3 to 20%, preferably SiO2: 6-15%; and/or B2O3: 15 to 38%, preferably B2O3: 21-35%; and/or Al2O3: 3-18%, preferably Al2O3: 4-16%; and/or Ln2O3: 35-60%, preferably Ln2O3: 40-55%; and/or RO: 0-10%, preferably RO: 0 to 5 percent; and/or Zr02: 0 to 3%, preferably Zr02: 0 to 2%, more preferably Zr02: 0 to 1 percent; and/or Ta2O5: 0 to 3%, preferably Ta2O5: 0 to 2%, more preferably Ta2O5: 0 to 1 percent; and/or Nb2O5: 0 to 3%, preferably Nb2O5: 0 to 1%, more preferably Nb2O5: 0 to 0.5 percent; and/or ZnO: 0-5%, preferably ZnO: 0 to 3%, more preferably ZnO: 0 to 1 percent; and/or Rn20: 0 to 3%, preferably Rn20: 0 to 2%, more preferably Rn20: 0 to 1 percent; and/or a clarifying agent: 0-0.5%, preferably clarifying agent: 0 to 0.1%.
Further, the optical glass comprises the following components in percentage by weight: la2O3: 20 to 50%, preferably La2O3: 25 to 45%, more preferably La2O3: 30-40%; and/or Gd2O3: 0 to 10%, preferably Gd2O3: 0 to 5%, more preferably Gd2O3: 0 to 1 percent; and/or Y2O3: 2 to 20%, preferably Y2O3: 4 to 18%, more preferably Y2O3: 6-15%; and/or MgO: 0-5%, preferably MgO: 0 to 4%, more preferably MgO: 0 to 3%, and more preferably MgO: 0-2%; and/or CaO: 0-5%, preferably CaO: 0-4%, more preferably CaO: 0-3%, preferably CaO: 0-2%; and/or SrO: 0 to 5%, preferably SrO: 0 to 4%, more preferably SrO: 0 to 3%, and more preferably SrO: 0-2%; and/or BaO: 0-5%, preferably BaO: 0 to 4%, more preferably BaO: 0 to 3%, and more preferably BaO: 0 to 2 percent.
Further, the refractive index n of the optical glassd1.66 to 1.70, preferably a refractive index ndIs 1.67 to 1.69, and has an Abbe number vdGreater than 50 but less than or equal to 58, preferably Abbe number vdIs 52 to 57.
Further, the stability of the optical glass against water action DWIs 2 or more, preferably 1; and/or stability against acid action DAIs 4 or more, preferably 3 or more; and/or Knoop hardness HKIs 650 x 107Pa or more, preferably 670X 107Pa is above; and/or a density p of 3.70g/cm3Hereinafter, it is preferably 3.60g/cm3The following.
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 and/or comprising the above optical element.
The invention has the beneficial effects that: the refractive index of the optical glass obtained by the invention is more than 1.66, the Abbe number is more than 50, the processability and the chemical durability are obviously superior to those of lanthanum crown glass in the prior art, the processing yield is greatly improved, the transmittance is not obviously reduced after long-term use, and the optical glass is very suitable for being used by an outdoor monitoring camera and a vehicle-mounted lens, and is particularly suitable for being applied to imaging applications which need to bear severe working environments such as wind, rain, sand and dust.
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. In the following, the optical glass of the present invention is sometimes simply referred to as glass.
[ optical glass ]
The ranges of the respective components (components) of the optical glass of the present invention are explained below. In the present invention, the contents and total contents of the respective components are all expressed in weight percent (wt%), that is, the contents and total contents of the respective components are expressed in weight percent with respect to the total amount of the glass substance 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 of the present invention are decomposed in the melt and converted to oxides, the total amount of the oxides is 100%.
Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. As used herein, "and/or" is inclusive, e.g., "A and/or B," and means A alone, B alone, or both A and B.
< essential Components and optional Components >
SiO2Is an essential component of the present invention by containing more than 2% SiO2To improve the processability and chemical durability of the glass. Thus, SiO2The content of (b) is 2% or more, preferably 3% or more, and more preferably 6% or more. On the other hand, by mixing SiO2The content of (b) is limited to 25% or less, and a larger refractive index can be easily obtained, and deterioration of the meltability of the glass and an excessive increase in the viscosity can be suppressed. Thus, SiO2The content of (b) is 25% or less, preferably 20% or less, more preferably 15% or less.
B2O3Is an essential component of the present invention by containing 12% or more of B2O3This has the effect of improving the meltability of glass and resistance to devitrification. Thus, B2O3The content of (b) is 12% or more, preferably 15% or more, and more preferably 21% or more. On the other hand, by mixing B2O3The content of (b) is limited to 40% or less, and deterioration of chemical durability of the glass can be suppressed. Thus, B2O3The content of (b) is 40% or less, preferably 38% or less, more preferably 35% or less.
Al2O3Is an essential component of the present invention, has the effect of improving processability, resistance to devitrification and chemical durability, and Al in the present invention2O3The content of the component (B) is 2% or more, preferably 3% or more, and more preferably 4% or more. Particularly, the SiO content is more than 6%2When the component (C) is contained, 4% or more of Al is added2O3Can inhibit SiO2The devitrification due to the component (B) gives a glass excellent in devitrification resistance. On the other hand, by mixing Al2O3The content of the component is limited to 20% or less, and excessive Al content can be prevented2O3Deterioration of resistance to devitrification and reduction of refractive index due to the component. Thus, Al2O3The content of the component (B) is 20% or less, preferably 18% or less, more preferably 16% or less.
In some embodiments of the invention, the composition is prepared by reacting (SiO)2+Al2O3)/B2O3The value of (A) is limited to 0.2 or more, and the chemical durability and hardness of the glass can be improved; on the other hand, by mixing (SiO)2+Al2O3)/B2O3The limit of 2.5 or less improves the processability of the glass, and suppresses the deterioration of the melting property of the glass raw material and the excessive increase of the viscosity. Therefore, (SiO) is preferable2+Al2O3)/B2O30.2 to 2.5, more preferably (SiO)2+Al2O3)/B2O30.3 to 2.0, and more preferably (SiO)2+Al2O3)/B2O30.4 to 1.5, and more preferably (SiO)2+Al2O3)/B2O30.5 to 0.8.
In the invention, La is added2O3、Y2O3And Gd2O3Total content Ln of2O3By controlling the refractive index and Abbe number of the glass to 30% or more, the refractive index and Abbe number of the glass can be increased, and the glass having a desired refractive index and Abbe number can be easily obtained. Thus, Ln2O3Is more than 30%, preferably more than 35%More preferably 40% or more. On the other hand, by mixing Ln2O3The content of (b) is limited to 65% or less, and the liquidus temperature of the glass can be lowered to prevent devitrification of the glass and improve the chemical durability of the glass. Thus, Ln2O3The content of (b) is 65% or less, preferably 60% or less, more preferably 55% or less.
In some embodiments, Al is added2O3/Ln2O3The content of the glass is controlled to be more than 0.05, so that the chemical durability and hardness of the glass are improved; on the other hand, by mixing Al2O3/Ln2O3The glass processability can be improved by limiting the glass to 0.5 or less. Therefore, Al is preferable2O3/Ln2O30.05 to 0.5, more preferably Al2O3/Ln2O30.08 to 0.4, and further preferably Al2O3/Ln2O30.1 to 0.3.
La2O3Has the effect of improving the refractive index and Abbe number of the glass, and in some embodiments of the invention, by containing more than 20% of La2O3To obtain the above effects, La is preferable2O3The content of (A) is 25% or more, more preferably La2O3The content of (A) is more than 30%. On the other hand, by mixing La2O3The content of (2) is limited to 50% or less, and the stability of the glass can be prevented from being lowered. Thus, La2O3The content of (b) is 50% or less, preferably 45% or less, more preferably 40% or less.
In some embodiments of the invention, Y is2O3The content of (A) is limited to 2% or more, and the specific gravity of the glass can be reduced compared with other rare earth components while the increase in the material cost of the glass can be suppressed while maintaining a high refractive index and a high Abbe number. On the other hand, by mixing Y2O3The content of the component (A) is limited to 20% or less, and deterioration of resistance to devitrification and chemical durability of the glass can be prevented. Thus, Y2O3The content of the component (A) is 2 to 20%, preferably 4 to 18%, more preferably 6 to 15%.
Gd2O3The refractive index and Abbe number of the glass may be increased, in some embodiments of the invention, by the incorporation of Gd2O3The content of (B) is limited to 10% or less, and the increase of the specific gravity of the glass can be suppressed. Thus, Gd2O3The content of (b) is 10% or less, preferably 5% or less, more preferably 1% or less.
By limiting the total content R0 of MgO, CaO, SrO, and BaO to 15% or less, it is possible to suppress deterioration of chemical durability of the glass due to excessive R0 content. Therefore, the content of R0 is 15% or less, preferably 10% or less, and more preferably 5% or less.
In some embodiments of the present invention, MgO can improve the low-temperature melting property of glass, and on the other hand, by setting the content of MgO to 5% or less, deterioration of chemical durability due to the inclusion of an excessive MgO component can be suppressed. Therefore, the content of the MgO component is 5% or less, preferably 4% or less, more preferably 3% or less, and further preferably 2% or less.
In some embodiments of the present invention, CaO can improve the low-temperature fusibility of the glass, while limiting the content of CaO to 5% or less can suppress deterioration of chemical durability due to the excessive content of CaO component. Therefore, the content of the CaO component is 5% or less, preferably 4% or less, more preferably 3% or less, and further preferably 2% or less.
In some embodiments of the present invention, SrO can improve the low-temperature melting property of the glass, and on the other hand, by limiting the content of the SrO component to 5% or less, deterioration in chemical durability due to the excessive SrO component can be suppressed. Therefore, the SrO content is 5% or less, preferably 4% or less, more preferably 3% or less, and still more preferably 2% or less.
In some embodiments of the present invention, BaO can improve the low-temperature melting property of the glass, and on the other hand, by limiting the content of the BaO component to 5% or less, deterioration of chemical durability due to the excessive BaO component can be suppressed. Therefore, the content of the BaO component is 5% or less, preferably 4% or less, more preferably 3% or less, and further preferably 2% or less.
Through a large amount of experimental research of the inventor, the inventor finds that (SiO)2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) of the optical film is controlled to 0.6 or more, and desired optical constants can be obtained while improving chemical durability. On the other hand, by mixing (SiO)2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) of 3.0 or less, and deterioration in the melting property of the glass raw material and excessive increase in the viscosity can be suppressed while improving the processability of the glass. Therefore, (SiO) is preferable2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is 0.6 to 3.0, more preferably (SiO)2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is 0.8 to 2.5, and (SiO) is more preferable2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is 1.0 to 2.0, and (SiO) is more preferable2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is 1.2 to 1.8.
In some embodiments, by mixing Ln2O3the/RO is controlled to 10.0 or more, and the chemical durability of the glass can be improved. Therefore, Ln is preferable2O3The ratio of/RO is 10.0 or more, and Ln is more preferable2O3The ratio of/RO is 15.0 or more, and Ln is more preferable2O3The ratio of/RO is 20.0 or more.
Zr02The refractive index and Abbe number of the glass can be improved, and the processability of the glass can be improved. On the other hand, by adding Zr02The content of (3) is limited to 5% or less, and the content of excess Zr0 can be reduced2Resulting in devitrification of the glass. Thus, Zr02The content of (b) is 5% or less, preferably 3% or less, more preferably 2% or less, and further preferably 1% or less.
Ta2O5Can improve the refractive index and the anti-devitrification performance of the glass. On the other hand, by using expensive Ta2O5The composition is limited to 5% or less, and the raw material cost of the glass can be reduced. Thus, Ta2O5The content of (b) is 5% or less, preferably 3% or less, more preferably 2% or less, and further preferably 1% or less. Ta may not be contained from the viewpoint of cost reduction2O5。
Nb2O5Can increase the refractive index of the glass by adding Nb2O5The content of (B) is limited to 5% or less, and the content of excess Nb can be reduced2O5Devitrification due to the component(s) and a decrease in the transmittance of the glass to visible light (particularly, a wavelength of 500nm or less) can be suppressed. Thus, Nb2O5The content of (b) is 5% or less, preferably 3% or less, more preferably 1% or less, and further preferably 0.5% or less.
While ZnO can improve the low-temperature melting property of the glass, by limiting the content of ZnO to 10% or less, the decrease in abbe number caused by the excessive content of ZnO can be suppressed. Therefore, the ZnO content is 10% or less, preferably 5% or less, more preferably 3% or less, and still more preferably 1% or less.
Rn20(Rn20 is Li2O、Na2O、K2One or more kinds of O) can adjust the refractive index of the glass and improve the meltability of the glass. By mixing Rn2The content of 0 is controlled to 5% or less, and excess Rn content can be suppressed20 component, and deterioration of chemical durability. Thus, Rn2The content of 0 is 5% or less, preferably 3% or less, more preferably 2% or less, and further preferably 1% or less.
The clarifying effect of the glass can be improved by containing 0-1% of clarifying agent, and Sb can be adopted in the invention2O3、SnO2SnO and CeO2As a clarifying agent. However, the present invention has a reasonable formulation design, and therefore, the present invention has a good clarification effect and an excellent bubble content, and therefore, it is preferable to contain 0 to 0.5% of clarifierThe clearing agent is more preferably 0-0.1% of clearing agent, and further preferably no clearing agent.
< 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.
"0%" or "0%" is not contained in the present invention, and means that the compound, molecule, element or the like is not intentionally added to the optical glass of the present invention as a raw material; 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.
In some embodiments, the refractive index (n) of the optical glass of the present inventiond) The lower limit of (B) is 1.66, and the preferable lower limit is 1.67. In some embodiments, the refractive index (n) of the optical glass of the present inventiond) The upper limit of (2) is 1.70, and the preferable upper limit is 1.69.
In some embodiments, the Abbe number (v) of the optical glass of the present inventiond) Is greater than 50, preferably 52 or greater. In some embodiments, the Abbe number (v) of the optical glass of the present inventiond) Is 58 or less, preferably 57 or less.
< stability against Water action >
Stability to Water of optical glass (D)W) (powder method) the test was carried out according to the method prescribed in GB/T17129.
In some embodiments, the optical glass of the present invention has stability to water effects (D)W) Is 2 or more, preferably 1.
< stability against acid Effect >
Stability of acid resistance of optical glasses (D)A) (powder method) the test was carried out according to the method prescribed in GB/T17129.
In some embodiments, the stability to acid action of the optical glasses of the invention (D)A) Is 4 or more, preferably 3 or more.
< Knoop hardness >
Knoop hardness (H) of optical glassK) The test was carried out according to the test method specified in GB/T7962.18-2010.
In some embodiments, the Knoop hardness (H) of the optical glasses of the present inventionK) Is 650 x 107Pa or more, preferably 670X 107Pa or above.
< Density >
The density (. rho.) of the optical glass was measured according to the test method specified in GB/T7962.20-2010.
In some embodiments, the optical glass of the present invention has a density (. rho.) of 3.70g/cm3Hereinafter, it is preferably 3.60g/cm3The following.
[ method for producing optical glass ]
The method for manufacturing the optical glass comprises the following steps: the glass of the invention can be produced by adopting conventional raw materials and processes, including but not limited to using carbonate, nitrate, sulfate, hydroxide, oxide, fluoride and the like as raw materials, mixing the raw materials according to a conventional method, putting the mixed furnace charge into a smelting furnace (such as a platinum or platinum alloy crucible) at 1250-1350 ℃ for smelting, obtaining homogeneous molten glass without bubbles and undissolved substances after clarification and homogenization, casting the molten glass in a mould and annealing.
The glass of the invention can also be produced by adopting a secondary smelting mode, namely, the mixture of the raw materials is firstly put into a quartz, alumina or zirconium crucible for smelting, the clinker is prepared after the smelting is finished, and then the clinker is put into a platinum or platinum alloy crucible for smelting, so that the required high-quality glass is obtained.
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 of the present invention and the optical element are each formed of the above-described optical glass of the present invention. The glass prefabricated member of the invention has the characteristics of medium refractive index and low dispersion; various optical elements such as lenses and prisms having high optical values can be provided. By having such an intermediate refractive index, a large amount of light refraction can be obtained even when the optical element is thinned. Further, by having such low dispersion, it is possible to reduce the deviation of focus (chromatic aberration) due to the wavelength of light when used as a single lens. Therefore, the optical glass of the present invention is useful in optical design, and particularly in the case of constituting an optical system, it is possible to realize miniaturization of the optical system while realizing high imaging characteristics and the like, and it is possible to expand the degree of freedom in optical design.
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.
Further, since the prism has a relatively high refractive index, by combining the prism with an imaging optical system and bending the optical path to direct the prism in a desired direction, a compact and wide-angle optical system can be realized.
[ optical instruments ]
The optical element formed by the optical glass can be used for manufacturing optical instruments such as photographic equipment, camera equipment, projection equipment, display equipment, vehicle-mounted equipment, monitoring equipment and the like. The optical glass has excellent chemical stability, and is particularly suitable for being applied to the fields of vehicle-mounted monitoring, security protection and the like.
In order to further understand the technical solution of the present invention, examples of the optical glass of the present invention will be described below. It should be noted that these examples do not limit the scope of the present invention.
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 compositions shown in tables 1 to 2 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 1 to 2. In the following table (SiO)2+Al2O3)/B2O3Is denoted by K1; ln2O3Is denoted by K2; al (Al)2O3/Ln2O3Is denoted by K3; the value of RO is denoted by K4; (SiO)2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is represented by K5; ln2O3The value of/RO is denoted K6.
TABLE 1
Figure BDA0003184297470000111
Figure BDA0003184297470000121
TABLE 2
Figure BDA0003184297470000122
Figure BDA0003184297470000131
< 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 from the above glass preform examples were annealed to reduce the internal stress of the glass and to fine-tune the refractive index so that the optical properties such as refractive index reached the 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 embodiments can be used, for example, for imaging devices, sensors, microscopes, medical technology, digital projection, communication, optical communication technology/information transmission, optics/illumination in the automotive field, lithography, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips, by optical design, by forming an optical component or optical assembly using one or more optical elements.

Claims (13)

1. Optical glass, characterized in that its components, expressed in weight percent, contain: SiO 22：2～25％；B2O3：12～40％；Al2O3：2～20％；Ln2O3: 30-65%; and (3) RO: 0 to 15%, refractive index n of the optical glassdIs 1.66 or more, wherein (SiO)2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is 0.6 to 3.0, the Ln2O3Is La2O3、Y2O3、Gd2O3The total content of RO is the total content of MgO, CaO, SrO and BaO.
2. An optical glass according to claim 1, characterised in that it further comprises, in percentages by weight: zr02: 0 to 5 percent; and/or Ta2O5: 0 to 5 percent; and/or Nb2O5: 0 to 5 percent; and/or ZnO: 0 to 10 percent; and/or Rn20: 0 to 5 percent; and/or a clarifying agent: 0 to 1%, of the total amount of Rn20 is Li2O、Na2O、K2One or more of O and Sb as clarifier2O3、SnO2SnO and CeO2One or more of (a).
3. An optical glass according to claim 1 or 2, characterised in that its components are expressed in weight percentages, wherein: (SiO)2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is 0.8 to 2.5, preferably (SiO)2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is 1.0 to 2.0, more preferably (SiO)2+Al2O3+Ln2O3)/(RO+B2O3+ndX 8) is 1.2 to 1.8.
4. An optical glass according to claim 1 or 2, characterised in that its components are expressed in weight percentages, wherein: (SiO)2+Al2O3)/B2O30.2 to 2.5, preferably (SiO)2+Al2O3)/B2O30.3 to 2.0, more preferably (SiO)2+Al2O3)/B2O30.4 to 1.5, and more preferably (SiO)2+Al2O3)/B2O30.5 to 0.8.
5. An optical glass according to claim 1 or 2, characterised in that its components are expressed in weight percentages, wherein: al (Al)2O3/Ln2O30.05 to 0.5, preferably Al2O3/Ln2O30.08 to 0.4, more preferably Al2O3/Ln2O30.1 to 0.3.
6. An optical glass according to claim 1 or 2, characterised in that its components are expressed in weight percentages, wherein: ln2O3The ratio of/RO is 10.0 or more, preferably Ln2O3/RO is 15.0 or more, more preferably Ln2O3The ratio of/RO is 20.0 or more.
7. An optical glass according to claim 1 or 2, characterised in that its components are expressed in weight percentages, wherein: SiO 22: 3 to 20%, preferably SiO2: 6-15%; and/or B2O3: 15 to 38%, preferably B2O3: 21-35%; and/or Al2O3: 3-18%, preferably Al2O3: 4-16%; and/or Ln2O3: 35-60%, preferably Ln2O3: 40-55%; and/or RO: 0-10%, preferably RO: 0 to 5 percent; and/or Zr02: 0 to 3%, preferably Zr02: 0 to 2%, more preferably Zr02: 0 to 1 percent; and/or Ta2O5: 0 to 3%, preferably Ta2O5: 0 to 2%, more preferably Ta2O5: 0 to 1 percent; and/or Nb2O5: 0 to 3%, preferably Nb2O5: 0 to 1%, more preferably Nb2O5: 0 to 0.5 percent; and/or ZnO: 0-5%, preferably ZnO: 0 to 3%, more preferably ZnO: 0 to 1 percent; and/or Rn20: 0 to 3%, preferably Rn20: 0 to 2%, more preferably Rn20: 0 to 1 percent; and/or a clarifying agent: 0-0.5%, preferably clarifying agent: 0 to 0.1%.
8. An optical glass according to claim 1 or 2, characterised in that its components are expressed in weight percentages, wherein: la2O3: 20 to 50%, preferably La2O3: 25 to 45%, more preferably La2O3: 30-40%; and/or Gd2O3: 0 to 10%, preferably Gd2O3: 0 to 5%, more preferably Gd2O3: 0 to 1 percent; and/or Y2O3: 2 to 20%, preferably Y2O3: 4 to 18%, more preferably Y2O3: 6-15%; and/or MgO: 0-5%, preferably MgO: 0 to 4%, more preferably MgO: 0 to 3%, and more preferably MgO: 0-2%; and/or CaO: 0-5%, preferably CaO: 0-4%, more preferably CaO: 0-3%, preferably CaO: 0-2%; and/or SrO: 0 to 5%, preferably SrO: 0 to 4%, more preferably SrO: 0 to 3%, and more preferably SrO: 0-2%; and/or BaO: 0-5%, preferably BaO: 0 to 4%, more preferably BaO: 0 to 3%, and more preferably BaO: 0 to 2 percent.
9. Optical glass according to claim 1 or 2, characterised in that the refractive index n of the optical glass isd1.66 to 1.70, preferably a refractive indexndIs 1.67 to 1.69, and has an Abbe number vdGreater than 50 but less than or equal to 58, preferably Abbe number vdIs 52 to 57.
10. The optical glass according to claim 1 or 2, wherein the optical glass has a stability to water action DWIs 2 or more, preferably 1; and/or stability against acid action DAIs 4 or more, preferably 3 or more; and/or Knoop hardness HKIs 650 x 107Pa or more, preferably 670X 107Pa is above; and/or a density p of 3.70g/cm3Hereinafter, it is preferably 3.60g/cm3The following.
11. A glass preform characterized by being made of the optical glass according to any one of claims 1 to 10.
12. An optical element produced from the optical glass according to any one of claims 1 to 10 or the glass preform according to claim 11.
13. An optical device comprising the optical glass according to any one of claims 1 to 10 and/or comprising the optical element according to claim 12.
CN202110856394.0A 2021-07-28 2021-07-28 Optical glass, glass preform, optical element and optical instrument Pending CN113415990A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
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CN111018342A (en) * 2019-12-24 2020-04-17 成都光明光电股份有限公司 Optical glass, glass preform, optical element and optical instrument

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JPWO2018003720A1 (en) * 2016-06-29 2019-04-18 株式会社オハラ Optical glass, preform material and optical element
CN110950531A (en) * 2019-12-18 2020-04-03 成都光明光电股份有限公司 Optical glass, glass preform, optical element and optical instrument
CN110963701A (en) * 2019-12-24 2020-04-07 成都光明光电股份有限公司 Optical glass, glass preform, optical element and optical instrument

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CN109415240A (en) * 2016-06-29 2019-03-01 株式会社小原 Optical glass, preform and optical module
JPWO2018003720A1 (en) * 2016-06-29 2019-04-18 株式会社オハラ Optical glass, preform material and optical element
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CN110963701A (en) * 2019-12-24 2020-04-07 成都光明光电股份有限公司 Optical glass, glass preform, optical element and optical instrument

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111018342A (en) * 2019-12-24 2020-04-17 成都光明光电股份有限公司 Optical glass, glass preform, optical element and optical instrument

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