CN117658445A - 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
CN117658445A
CN117658445A CN202211030904.XA CN202211030904A CN117658445A CN 117658445 A CN117658445 A CN 117658445A CN 202211030904 A CN202211030904 A CN 202211030904A CN 117658445 A CN117658445 A CN 117658445A
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optical glass
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glass
sio
percent
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孙伟
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CDGM Glass Co Ltd
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CDGM Glass Co Ltd
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Priority to CN202211030904.XA priority Critical patent/CN117658445A/en
Priority to PCT/CN2023/109264 priority patent/WO2024041294A1/en
Publication of CN117658445A publication Critical patent/CN117658445A/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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  • Chemical & Material Sciences (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 optical glass, which comprises the following components in percentage by weight: siO (SiO) 2 ：2～20％；B 2 O 3 ：3～20％；La 2 O 3 ：35～60％；Y 2 O 3 ：5～30％；ZrO 2 ：2～15％；Nb 2 O 5 ：1～15％；Ta 2 O 5 : 0-15%. Through reasonable component design, the invention can obtain the optical glass with excellent chemical stability with lower raw material cost.

Description

Optical glass, glass preform, optical element, and optical instrument
Technical Field
The present invention relates to an optical glass, and more particularly, to an optical glass having a refractive index of 1.86 to 1.92 and an abbe number of 36 to 44, and a glass preform, an optical element, and an optical instrument each made of the same.
Background
In recent years, optical instruments are digitalized and highly refined, and high requirements are put on optical glass applied to the optical instruments. The optical glass with the refractive index of 1.86-1.92 and the Abbe number of 36-44 has higher refractive index, so that miniaturization, ultrathin and wide angle are easier to realize, and the application scene is wider. In order to apply the optical glass to various optical instruments, the optical glass needs to be processed or cleaned, and if the chemical stability of the optical glass is poor, the glass is easy to be blemished in the processing or cleaning process, so that the yield of the optical glass is reduced. In the prior art, optical glass with refractive index of 1.86-1.92 and Abbe number of 36-44 contains a large amount of Ta 2 O 5 An optical glass having a refractive index of 1.85 to 1.90 and an Abbe number of 35 to 45 as disclosed in CN101386469A, which contains Ta in an amount of more than 19% and less than 27% 2 O 5 。Ta 2 O 5 Is a scarce metal component, and has a high Ta content 2 O 5 The cost control of the optical glass is disadvantageous. In imaging devices such as digital cameras and digital video cameras,in various optical devices such as image playback (projection) devices such as projectors and projection televisions, it is desirable to use optical glasses having excellent chemical stability and low raw material cost in order to improve yield and reduce cost.
Disclosure of Invention
The invention aims to solve the technical problem of providing the optical glass with low raw material cost and excellent chemical stability.
The technical scheme adopted for solving the technical problems is as follows:
the optical glass comprises the following components in percentage by weight: siO (SiO) 2 ：2～20％；B 2 O 3 ：3～20％；La 2 O 3 ：35～60％；Y 2 O 3 ：5～30％；ZrO 2 ：2～15％；Nb 2 O 5 ：1～15％；Ta 2 O 5 ：0～15％。
Further, the optical glass comprises the following components in percentage by weight: gd (Gd) 2 O 3 : 0-8%; and/or TiO 2 : 0-5%; and/or RO: 0-8%; and/or Rn 2 O: 0-8%; and/or WO 3 : 0-5%; and/or ZnO: 0-8%; and/or Al 2 O 3 : 0-8%; and/or Yb 2 O 3 : 0-8%; and/or GeO 2 : 0-5%; and/or clarifying agent: 0 to 2 percent of RO is one or more of MgO, caO, srO, baO, rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O and a clarifying agent of Sb 2 O 3 、SnO、SnO 2 、CeO 2 One or more of the following.
An optical glass, the components of which are represented by weight percentage and are composed of SiO 2 ：2～20％；B 2 O 3 ：3～20％；La 2 O 3 ：35～60％；Y 2 O 3 ：5～30％；ZrO 2 ：2～15％；Nb 2 O 5 ：1～15％；Ta 2 O 5 ：0～15％；Gd 2 O 3 ：0～8％；TiO 2 ：0～5％；RO：0～8％；Rn 2 O：0～8％；WO 3 ：0～5％；ZnO：0～8％；Al 2 O 3 ：0～8％；Yb 2 O 3 ：0～8％；GeO 2 : 0-5%; clarifying agent: 0 to 2 percent of the composition, wherein the RO is one or more of MgO, caO, srO, baO, rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O and a clarifying agent of Sb 2 O 3 、SnO、SnO 2 、CeO 2 One or more of the following.
Further, the optical glass comprises the following components in percentage by weight: la (La) 2 O 3 +Y 2 O 3 +Gd 2 O 3 45 to 75%, preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 50 to 75%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 55 to 70%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 60 to 70 percent.
Further, the optical glass comprises the following components in percentage by weight: y is Y 2 O 3 /B 2 O 3 From 0.5 to 5.0, preferably Y 2 O 3 /B 2 O 3 From 0.6 to 3.0, more preferably Y 2 O 3 /B 2 O 3 From 0.7 to 2.5, more preferably Y 2 O 3 /B 2 O 3 0.8 to 2.0.
Further, the optical glass comprises the following components in percentage by weight: gd (Gd) 2 O 3 /(SiO 2 +B 2 O 3 ) Is 1.0 or less, preferably Gd 2 O 3 /(SiO 2 +B 2 O 3 ) Is 0.8 or less, more preferably Gd 2 O 3 /(SiO 2 +B 2 O 3 ) Is 0.5 or less, and further preferably Gd 2 O 3 /(SiO 2 +B 2 O 3 ) Is 0.3 or less.
Further, the optical glass comprises the following components in percentage by weight: (La) 2 O 3 +Y 2 O 3 )/ZrO 2 Is 4.0 or more, preferably (La 2 O 3 +Y 2 O 3 )/ZrO 2 Is 5.0 to 20.0, more preferably (La) 2 O 3 +Y 2 O 3 )/ZrO 2 Is 6.0 to 13.0, more preferably (La) 2 O 3 +Y 2 O 3 )/ZrO 2 7.0 to 11.0.
Further, the optical glass comprises the following components in percentage by weight: y is Y 2 O 3 /(Ta 2 O 5 +ZnO) of 0.5 to 8.0, preferably Y 2 O 3 /(Ta 2 O 5 +ZnO) of 0.7 to 5.0, more preferably Y 2 O 3 /(Ta 2 O 5 +ZnO) is 0.8 to 4.0, more preferably Y 2 O 3 /(Ta 2 O 5 +ZnO) is 1.0 to 3.0.
Further, the optical glass comprises the following components in percentage by weight: la (La) 2 O 3 /Nb 2 O 5 At least 3.0, preferably La 2 O 3 /Nb 2 O 5 From 4.0 to 30.0, more preferably La 2 O 3 /Nb 2 O 5 From 5.0 to 20.0, la being more preferred 2 O 3 /Nb 2 O 5 6.0 to 12.0.
Further, the optical glass comprises the following components in percentage by weight: (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 0.3 to 8.0, preferably (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 0.5 to 6.0, more preferably (Ta 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 0.6 to 5.0, more preferably (Ta 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 0.8 to 3.0.
Further, the optical glass comprises the following components in percentage by weight: (TiO) 2 +WO 3 )/Y 2 O 3 Is 1.0 or less, preferably (TiO) 2 +WO 3 )/Y 2 O 3 Is 0.8 or less, more preferably (TiO) 2 +WO 3 )/Y 2 O 3 Is 0.5 or less, more preferably (TiO) 2 +WO 3 )/Y 2 O 3 Is 0.1 or less.
Further, the optical glass comprises the following components in percentage by weight: (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 1.0 or less, preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.8 or less, more preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.5 or less, more preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.3 or less.
Further, the optical glass comprises the following components in percentage by weight: siO (SiO) 2 :3 to 15%, preferably SiO 2 : 4-10%; and/or B 2 O 3 :5 to 15%, preferably B 2 O 3 : 7-13%; and/or La 2 O 3 :38 to 60%, preferably La 2 O 3 : 41-55%; and/or Y 2 O 3 :7 to 24%, preferably Y 2 O 3 :8 to 22%, more preferably Y 2 O 3 : 11-22%; and/or ZrO 2 :3 to 13%, preferably ZrO 2 : 4-10%; and/or Nb 2 O 5 :2 to 10%, preferably Nb 2 O 5 : 3-8%; and/or Ta 2 O 5 :2 to 12%, preferably Ta 2 O 5 : 5-10%; and/or Gd 2 O 3 :0 to 5%, preferably Gd 2 O 3 :0 to 3 percent; and/or TiO 2 :0 to 3%, preferably TiO 2 :0 to 2 percent; and/or RO: 0-3%, preferably RO:0 to 2 percent; and/or Rn 2 O:0 to 3%, preferably Rn 2 O:0 to 2 percent; and/or WO 3 :0 to 3%, preferably WO 3 :0 to 2 percent; and/or ZnO:0 to 4%, preferably ZnO:0 to 2 percent; and/or Al 2 O 3 :0 to 4%, preferably Al 2 O 3 :0 to 2 percent; and/or Yb 2 O 3 :0 to 5%, preferably Yb 2 O 3 :0 to 3 percent; and/or GeO 2 ：0～3％Preferably GeO 2 :0 to 1 percent; and/or clarifying agent: 0-1%, preferably clarifying agent: 0 to 0.5 percent, the RO is one or more of MgO, caO, srO, baO and Rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O and a clarifying agent of Sb 2 O 3 、SnO、SnO 2 、CeO 2 One or more of the following.
Further, the optical glass does not contain WO in the components 3 The method comprises the steps of carrying out a first treatment on the surface of the And/or does not contain TiO 2 The method comprises the steps of carrying out a first treatment on the surface of the And/or does not contain RO; and/or does not contain Rn 2 O; and/or contain no ZnO; and/or does not contain Al 2 O 3 The method comprises the steps of carrying out a first treatment on the surface of the And/or does not contain GeO 2 The RO is one or more of MgO, caO, srO, baO, rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O.
Further, the optical glass comprises the following components in percentage by weight 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 、Nb 2 O 5 、Ta 2 O 5 The total content of (2) is 85% or more, preferably SiO 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 、Nb 2 O 5 、Ta 2 O 5 The total content of (2) is 88% or more, more preferably SiO 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 、Nb 2 O 5 、Ta 2 O 5 The total content of (2) is 90% or more, further preferably SiO 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 、Nb 2 O 5 、Ta 2 O 5 The total content of (2) is 95% or more.
Further, the refractive index n of the optical glass d From 1.86 to 1.92, preferably from 1.87 to 1.91, more preferably from 1.88 to 1.90, abbe number v d 36 to 44, preferably 38 to 43, more preferably 39 to 42.
Further, the density ρ of the optical glass is 5.20g/cm 3 Hereinafter, it is preferably 5.15g/cm 3 Hereinafter, more preferably 5.10g/cm 3 The following are set forth; and/or coefficient of thermal expansion alpha 20/120℃ 85X 10 -7 Preferably 80X 10, and K is less than or equal to -7 Preferably 75X 10 or less per K -7 and/K or below; and/or stability against water action D W More than 2 types, preferably 1 type; and/or lambda 70 Is 400nm or less, preferably lambda 70 Is 390nm or less, more preferably lambda 70 385nm or less; and/or lambda 5 Is 340nm or less, preferably lambda 5 330nm or less, more preferably lambda 5 Is 325nm or less; and/or weather resistance CR is 2 or more, preferably 1; and/or knoop hardness H K 690×10 7 Pa or more, preferably 700×10 7 Pa or more, more preferably 710×10 7 Pa or more; and/or Young's modulus E of 10500×10 7 Pa～14500×10 7 Pa, preferably 11000X 10 7 Pa～14000×10 7 Pa, more preferably 11500X 10 7 Pa～13500×10 7 Pa; and/or the degree of air bubbles is a class A or more, preferably A 0 Above the stage, more preferably A 00 A stage.
And a glass preform made of the optical glass.
The optical element is made of the optical glass or the glass prefabricated member.
An optical instrument comprising the optical glass and/or comprising the optical element.
The beneficial effects of the invention are as follows: through reasonable component design, the invention can obtain the optical glass with excellent chemical stability with lower raw material cost.
Detailed Description
The embodiments of the optical glass of the present invention will be described in detail below, but the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the object of the present invention. In the repeated explanation, the optical glass of the present invention is sometimes referred to simply as glass in the following description, although the explanation is omitted appropriately, and the gist of the present invention is not limited thereto.
[ optical glass ]
The ranges of the respective components (ingredients) of the optical glass of the present invention are described below. In the present invention, unless otherwise specified, the content and the total content of each component are all expressed in weight percent (wt%), that is, the content and the total content of each component are expressed in weight percent with respect to the total amount of the glass substance converted into the composition of oxide. The term "composition converted into oxide" as used herein means that the total amount of oxide used as a raw material of the optical glass composition of the present invention is 100% when the oxide, the composite salt, the hydroxide, and the like are melted and decomposed and converted into oxide.
Unless otherwise indicated in a particular context, the numerical ranges set forth herein include upper and lower limits, and "above" and "below" include the endpoints, and all integers and fractions within the range, and are not limited to the specific values set forth in the defined range. The term "and/or" as used herein is inclusive, e.g. "a and/or B", meaning either a alone, B alone, or both a and B.
< essential Components and optional Components >
SiO 2 Has the functions of adjusting optical constant, improving chemical stability of glass, maintaining viscosity suitable for melting glass, reducing abrasion degree and erosion of refractory material, and is prepared by the method of the invention by containing more than 2% of SiO 2 To obtain the above effect, siO is preferred 2 The content of (C) is 3% or more, more preferably SiO 2 The content of (2) is 4% or more. If SiO is 2 The content of (2) is too high, the difficulty in melting the glass increases, and the transition temperature increases. Thus, siO in the present invention 2 The upper limit of the content of (2) is 20%, preferably 15%, more preferably 10%.
B 2 O 3 The glass has improved meltability and devitrification resistance, and is favorable for lowering the glass transition temperature, and the glass comprises more than 3 percent of B 2 O 3 To obtain the above effect, it preferably contains 5% or more of B 2 O 3 More preferably, the content of B is 7% or more 2 O 3 . If B 2 O 3 If the content of (b) is too high, the chemical stability of the glass becomes poor, particularly the water resistance becomes poor, and the refractive index and light transmittance of the glass become low. Thus B 2 O 3 The content of (2) is 20% or less, preferably 15% or less, and more preferably 13% or less.
La 2 O 3 Is an effective component for improving the refractive index of glass, has obvious effect on improving the chemical stability and the devitrification resistance of the glass, and is difficult to reach the required optical constant if the content is less than 35 percent; if the content is more than 60%, the devitrification tendency of the glass increases, and the thermal stability becomes poor. Therefore La 2 O 3 The content of (2) is limited to 35 to 60%, preferably 38 to 60%, more preferably 41 to 55%.
Y 2 O 3 The glass has improved refractive index and devitrification resistance, and the Young's modulus is adjusted by containing more than 5% of Y 2 O 3 To obtain the above-mentioned effects; if the content exceeds 30%, the chemical stability and weather resistance of the glass are deteriorated. Thus, Y in the present invention 2 O 3 The content is 5 to 30%, preferably 7 to 24%, more preferably 8 to 22%, and even more preferably 11 to 22%.
In some embodiments, Y 2 O 3 Content of (B) and B 2 O 3 Ratio Y between the contents of (2) 2 O 3 /B 2 O 3 The Young's modulus of the glass is controlled within the range of 0.5-5.0, which is favorable for obtaining proper Young's modulus of the glass. Therefore, Y is preferred 2 O 3 /B 2 O 3 From 0.5 to 5.0, more preferably Y 2 O 3 /B 2 O 3 0.6 to 3.0. Further, by combining Y 2 O 3 /B 2 O 3 The temperature is controlled within the range of 0.7-2.5, which is favorable for further reducing the thermal expansion coefficient of the glass and optimizing the bubble degree of the glass. Therefore, Y is further preferable 2 O 3 /B 2 O 3 From 0.7 to 2.5, more preferably Y 2 O 3 /B 2 O 3 0.8 to 2.0.
Gd 2 O 3 The refractive index and chemical stability of the glass can be improved, but if the content is more than 8%, the devitrification resistance and abrasion resistance of the glass become poor. Thus Gd 2 O 3 The content of (2) is 0 to 8%, preferably 0 to 5%, more preferably 0 to 3%.
In some embodiments, gd 2 O 3 Content of (2) and SiO 2 And B 2 O 3 Is the total content of SiO 2 +B 2 O 3 Ratio between Gd 2 O 3 /(SiO 2 +B 2 O 3 ) The density of the glass can be reduced and the bubble degree and abrasion degree of the glass can be optimized by controlling the glass content below 1.0. Thus, gd is preferred 2 O 3 /(SiO 2 +B 2 O 3 ) Is 1.0 or less, more preferably Gd 2 O 3 /(SiO 2 +B 2 O 3 ) Is 0.8 or less, and further preferably Gd 2 O 3 /(SiO 2 +B 2 O 3 ) Gd is more preferably 0.5 or less 2 O 3 /(SiO 2 +B 2 O 3 ) Is 0.3 or less.
In some embodiments, by combining La 2 O 3 、Y 2 O 3 And Gd 2 O 3 Sum of (1) La 2 O 3 +Y 2 O 3 +Gd 2 O 3 The glass is controlled in the range of 45 to 75%, the desired refractive index and Abbe number are more easily obtained, and the devitrification resistance and weather resistance of the glass are optimized. Therefore, la is preferred 2 O 3 +Y 2 O 3 +Gd 2 O 3 45 to 75%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 50 to 75%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 55 to 70%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 60 to 70 percent.
Yb 2 O 3 Also, a component imparting high refractive and low dispersion properties to the glass, and if the content exceeds 8%, the crystallization resistance of the glass is lowered. Thus, the first and second substrates are bonded together,Yb 2 O 3 the content of (C) is 0 to 8%, preferably 0 to 5%, more preferably 0 to 3%, and even more preferably no Yb is contained 2 O 3 。
ZrO 2 The viscosity, hardness, refractive index and chemical stability of the optical glass can be improved, and the thermal expansion coefficient of the glass can be reduced; when ZrO (ZrO) 2 When the content of (b) is too high, devitrification resistance of the glass decreases, melting difficulty increases, melting temperature increases, and inclusion and light transmittance decrease occur in the glass. Thus, zrO in the present invention 2 The content of (2) to (15%), preferably 3% to (13%), more preferably 4% to (10%).
In some embodiments, by combining La 2 O 3 And Y 2 O 3 Sum of (1) La 2 O 3 +Y 2 O 3 With ZrO 2 Ratio between the contents of (La) 2 O 3 +Y 2 O 3 )/ZrO 2 The Young's modulus of the glass is controlled to be more than 4.0, so that the glass is easy to obtain the expected Young's modulus, and the density of the glass is reduced. Therefore, (La 2 O 3 +Y 2 O 3 )/ZrO 2 Is 4.0 or more, more preferably (La 2 O 3 +Y 2 O 3 )/ZrO 2 5.0 to 20.0. Further, control (La 2 O 3 +Y 2 O 3 )/ZrO 2 In the range of 6.0 to 13.0, the weather resistance and hardness of the glass can be further optimized. Therefore, (La 2 O 3 +Y 2 O 3 )/ZrO 2 In the range of 6.0 to 13.0, more preferably (La) 2 O 3 +Y 2 O 3 )/ZrO 2 7.0 to 11.0.
TiO 2 The refractive index of the glass can be increased, but too high a content greatly reduces the dispersion coefficient and increases the tendency to devitrify, even causing the glass to be significantly colored. Thus, tiO 2 The content is limited to 0 to 5%, preferably 0 to 3%, more preferably 0 to 2%, and even more preferably no TiO is contained 2 。
Nb 2 O 5 Is a high-refraction high-dispersion component, can improve the refractive index and the devitrification resistance of the glass,the thermal expansion coefficient of the glass is reduced by containing more than 1% of Nb 2 O 5 To obtain the above effect, nb is preferable 2 O 5 The lower limit of the content of (2%) is more preferably 3%. If Nb is 2 O 5 The content of Nb exceeds 15%, the heat stability and weather resistance of the glass are lowered, and the light transmittance is lowered, so Nb in the present invention 2 O 5 The upper limit of the content of (2) is 15%, preferably 10%, more preferably 8%.
In some embodiments, la 2 O 3 Content of (2) and Nb 2 O 5 Ratio La between the contents of (A) 2 O 3 /Nb 2 O 5 The glass hardness is improved while preventing the decrease of light transmittance and achieving a proper Young's modulus by controlling the glass hardness to 3.0 or more. Therefore, la is preferred 2 O 3 /Nb 2 O 5 At least 3.0, more preferably La 2 O 3 /Nb 2 O 5 From 4.0 to 30.0, la is more preferable 2 O 3 /Nb 2 O 5 From 5.0 to 20.0, la being more preferred 2 O 3 /Nb 2 O 5 6.0 to 12.0.
Alkaline earth oxide RO (RO is one or more of MgO, caO, srO, baO) can adjust the optical constants of the glass to optimize the chemical stability of the glass, but when its content is high, the devitrification resistance of the glass decreases. Therefore, the RO content is limited to 0 to 8%, preferably 0 to 3%, more preferably 0 to 2%. In some embodiments, it is further preferred that RO is not present.
Alkali metal oxide Rn 2 O(Rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O) can lower the glass transition temperature, adjust the optical constant and high-temperature viscosity of the glass, improve the meltability of the glass, but when the content thereof is high, the devitrification resistance and chemical stability of the glass are reduced. Thus, rn in the present invention 2 The content of O is 0 to 8%, preferably 0 to 3%, more preferably 0 to 2%. In some embodiments, it is further preferred that Rn is absent 2 O。
WO 3 Can be improvedRefractive index and mechanical Strength of glass, if WO 3 The content of (2) exceeds 5%, the thermal stability of the glass decreases, and the devitrification resistance decreases. Thus, WO 3 The upper limit of the content of (2) is 5%, preferably 3%, more preferably 2%. In some embodiments, it is further preferred that WO is not included 3 。
In some embodiments, tiO is used 2 And WO 3 Is TiO based on the total content of 2 +WO 3 And Y is equal to 2 O 3 Ratio between the contents of (TiO) 2 +WO 3 )/Y 2 O 3 The chemical stability and the bubble degree of the glass can be improved by controlling the temperature below 1.0. Therefore, it is preferable that (TiO 2 +WO 3 )/Y 2 O 3 Is 1.0 or less, more preferably (TiO) 2 +WO 3 )/Y 2 O 3 Is 0.8 or less. Further, control (TiO 2 +WO 3 )/Y 2 O 3 The abrasion degree of the glass can be further optimized below 0.5, and the rise of the thermal expansion coefficient of the glass can be prevented. Therefore, it is more preferable that (TiO 2 +WO 3 )/Y 2 O 3 Is 0.5 or less, more preferably (TiO) 2 +WO 3 )/Y 2 O 3 Is 0.1 or less.
ZnO can adjust the refractive index and dispersion of the glass, and reduce the high-temperature viscosity and the transition temperature of the glass. If the ZnO content is too high, the glass forming difficulty is increased, and the crystallization resistance is deteriorated. Accordingly, the content of ZnO is 0 to 8%, preferably 0 to 4%, more preferably 0 to 2%. In some embodiments, it is further preferred that ZnO is absent.
In some embodiments, by incorporating Gd 2 O 3 And ZnO total content Gd 2 O 3 +ZnO and Y 2 O 3 Ratio between the contents of (Gd) 2 O 3 +ZnO)/Y 2 O 3 The thermal expansion coefficient of the glass can be reduced and the abrasion degree of the glass can be optimized by controlling the temperature below 1.0. Therefore, (Gd 2 O 3 +ZnO)/Y 2 O 3 Is 1.0 or less, more preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.8 or less. Further, control (Gd 2 O 3 +ZnO)/Y 2 O 3 Below 0.5, the glass can be made more easily to have a suitable Young's modulus and the glass hardness can be prevented from being lowered. Therefore, (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.5 or less, more preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.3 or less.
Ta 2 O 5 The glass has the functions of improving the refractive index and improving the devitrification resistance of the glass, but if the content is too high, the thermal stability of the glass is reduced, the density is increased, and the optical constant is difficult to control to a desired range; on the other hand, ta compared with other components 2 O 5 Is very expensive, and the amount of the catalyst to be used should be reduced as much as possible from the practical and cost viewpoints. Thus, ta in the present invention 2 O 5 The content of (2) is limited to 0 to 15%, preferably 2 to 12%, more preferably 5 to 10%.
In some embodiments, Y 2 O 3 Content of (2) and Ta 2 O 5 Total content Ta of ZnO 2 O 5 Ratio between +ZnO Y 2 O 3 /(Ta 2 O 5 +ZnO) is controlled within the range of 0.5-8.0, which is beneficial to improving the chemical stability of the glass, preventing the light transmittance from being reduced and improving the hardness of the glass. Therefore, Y is preferred 2 O 3 /(Ta 2 O 5 +ZnO) of 0.5 to 8.0, more preferably Y 2 O 3 /(Ta 2 O 5 +ZnO) is 0.7 to 5.0, and Y is more preferable 2 O 3 /(Ta 2 O 5 +ZnO) is 0.8 to 4.0, and Y is more preferable 2 O 3 /(Ta 2 O 5 +ZnO) is 1.0 to 3.0.
In some embodiments, by combining Ta 2 O 5 And Gd 2 O 3 Is the total content Ta of (2) 2 O 5 +Gd 2 O 3 With Nb 2 O 5 Ratio between the contents of (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 The thermal expansion coefficient of the glass can be reduced while the chemical stability of the glass is improved by controlling the temperature within the range of 0.3-8.0. Therefore, it is excellentSelect (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 0.3 to 8.0, more preferably (Ta 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 0.5 to 6.0. Further, it is preferable that (Ta 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Within the range of 0.6-5.0, the density and Young's modulus of the glass are optimized. Therefore, it is more preferable that (Ta 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 0.6 to 5.0, more preferably (Ta 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 0.8 to 3.0.
Al 2 O 3 The chemical stability of the glass can be improved, but when the content exceeds 8%, the melting property and light transmittance of the glass become poor. Thus, al in the present invention 2 O 3 The content of (2) is 0 to 8%, preferably 0 to 4%, more preferably 0 to 2%. In some embodiments, it is further preferred that Al is absent 2 O 3 。
GeO 2 Has the effect of improving the refractive index and the devitrification resistance, but if the content is too high, the chemical stability of the glass is reduced; on the other hand, geO is superior to other components 2 Is very expensive, and the amount of the catalyst to be used should be reduced as much as possible from the practical and cost viewpoints. Thus, geO in the present invention 2 The content of (2) is limited to 0 to 5%, preferably 0 to 3%, more preferably 0 to 1%, and even more preferably no GeO is contained 2 。
In the invention, 0 to 2 percent of Sb is contained 2 O 3 、SnO、SnO 2 、CeO 2 The one or more components in the glass are used as a clarifying agent, so that the clarifying effect of the glass can be improved, the bubble degree of the glass is improved, the content of the clarifying agent is preferably 0-1%, and the content of the clarifying agent is more preferably 0-0.5%. Since the optical glass of the present invention has a reasonable design of the types and contents of components and is excellent in bubble degree, it is further preferable that a clarifier is not contained in some embodiments. When Sb is 2 O 3 At a content exceeding 2%, the glass tends to be degraded in fining property and is strongly oxidizedThe action promotes corrosion of platinum or platinum alloy vessels for melting glass and deterioration of molding dies, so that Sb is preferable in the present invention 2 O 3 The content of (C) is 0 to 2%, more preferably 0 to 1%, still more preferably 0 to 0.5%, and still more preferably no Sb is contained 2 O 3 . SnO and SnO 2 When the content exceeds 2%, the glass tends to be colored, or when the glass is heated, softened, and subjected to press molding or the like to be reformed, sn becomes a starting point of nucleation and devitrification tends to occur. Thus SnO of the present invention 2 The content of (2) is preferably 0 to 2%, more preferably 0 to 1%, still more preferably 0 to 0.5%, and still more preferably no SnO is contained 2 The method comprises the steps of carrying out a first treatment on the surface of the The content of SnO is preferably 0 to 2%, more preferably 0 to 1%, still more preferably 0 to 0.5%, and still more preferably no SnO is contained. CeO (CeO) 2 Action and content ratio of (2) and SnO 2 The content thereof is preferably 0 to 2%, more preferably 0 to 1%, even more preferably 0 to 0.5%, and still more preferably no CeO is contained 2 。
In some embodiments, to achieve lower coefficients of thermal expansion and density, higher hardness and light transmittance, excellent chemical stability and suitable abrasion and Young's modulus for the optical glass of the present invention, siO is preferred 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 、Nb 2 O 5 、Ta 2 O 5 The total content of (2) is 85% or more, more preferably SiO 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 、Nb 2 O 5 、Ta 2 O 5 The total content of (2) is 88% or more, and SiO is more preferable 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 、Nb 2 O 5 、Ta 2 O 5 The total content of (2) is 90% or more, and SiO is more preferable 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 、Nb 2 O 5 、Ta 2 O 5 The total content of (2) is 95% or more.
< component not to be contained >
In the glass of the present invention, V, cr, mn, fe, co, ni, cu, ag and oxides of transition metals such as Mo are colored even when they are contained in small amounts, either alone or in combination, and absorb at a specific wavelength in the visible light range, so that the property of the present invention of improving the visible light transmittance effect is impaired, and therefore, in particular, an optical glass having a wavelength transmittance in the visible light range is preferably practically not contained.
Th, cd, tl, os, be and Se oxides have a tendency to be used in a controlled manner as harmful chemical substances in recent years, and are required to provide environmental protection not only in the glass manufacturing process but also in the processing steps and disposal after production. Therefore, in the case where the influence on the environment is emphasized, it is preferable that they are not substantially contained except for unavoidable mixing. As a result, the optical glass becomes practically free from environmental pollutants. Therefore, the optical glass of the present invention can be manufactured, processed, and discarded without taking special measures against the environment.
In order to achieve environmental friendliness, the optical glass of the present invention preferably does not contain As 2 O 3 And PbO.
The term "not containing" or "0%" as used herein means 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 also within the scope of the present invention that certain impurities or components may be present as raw materials and/or equipment for producing optical glass that are not intentionally added, and that may be present in small or trace amounts in the final optical glass.
The performance of the optical glass of the present invention will be described below.
< refractive index and Abbe number >
Refractive index (n) d ) With Abbe number (v) d ) Tested according to the method specified in GB/T7962.1-2010.
In some embodiments, the refractive index (n d ) The lower limit of (2) is 1.86, preferably 1.87, more preferably 1.88.
In some embodiments, the refractive index (n d ) The upper limit of (2) is 1.92, preferably 1.91, more preferably 1.90.
In some embodiments, the Abbe number (. Nu.) of the optical glass of the present invention d ) The lower limit of (2) is 36, preferably 38, and more preferably 39.
In some embodiments, the Abbe number (. Nu.) of the optical glass of the present invention d ) The upper limit of (2) is 44, preferably 43, and more preferably 42.
< Density >
The density (. Rho.) of the optical glass was measured according to the method prescribed in GB/T7962.20-2010.
In some embodiments, the optical glass of the present invention has a density (ρ) of 5.20g/cm 3 Hereinafter, it is preferably 5.15g/cm 3 Hereinafter, more preferably 5.10g/cm 3 The following is given.
< coefficient of thermal expansion >
Coefficient of thermal expansion (. Alpha.) of optical glass 20/120℃ ) Data at 20-120℃were tested according to the procedure prescribed in GB/T7962.16-2010.
In some embodiments, the optical glass of the present invention has a coefficient of thermal expansion (α 20/120℃ ) 85X 10 -7 Preferably 80X 10, and K is less than or equal to -7 Preferably 75X 10 or less per K -7 and/K or below.
< stability against Water action >
Stability against Water action of optical glass (D W ) (powder method) the test was carried out according to the method prescribed in GB/T17129.
In some embodiments, the water resistance stability (D W ) More than 2 kinds, preferably 1 kind.
< coloring degree >
The glass of the present invention has a coloring degree (lambda) for short-wave transmission spectrum characteristics 70 And lambda (lambda) 5 ) And (3) representing. Lambda (lambda) 70 Refers to the wavelength corresponding to when the glass transmittance reaches 70%. Lambda (lambda) 70 Is to measure spectral transmittance in a wavelength range from 280nm to 700nm and to exhibit a wavelength of 70% transmittance using glass having a thickness of 10.+ -. 0.1mm having two opposite planes which are parallel to each other and optically polished. The spectral transmittance or transmittance is the intensity I at right angles to the surface of the glass in Transmits through glass and emits intensity I from a plane out In the case of light passing through I out /I in The indicated amounts, and also the transmittance of the surface reflection losses on the above-mentioned surface of the glass. The higher the refractive index of the glass, the greater the surface reflection loss. Thus, in high refractive index glass, λ 70 The small value of (2) means that the glass itself is extremely little colored and the light transmittance is high.
In some embodiments, λ of the optical glass of the present invention 70 Is 400nm or less, preferably lambda 70 Is 390nm or less, more preferably lambda 70 Is 385nm or less.
In some embodiments, λ of the optical glass of the present invention 5 Is 340nm or less, preferably lambda 5 330nm or less, more preferably lambda 5 Is 325nm or less.
< weather resistance >
The weather resistance (CR) test method of the optical glass is as follows: the sample is placed in a test box in a saturated steam environment with the relative humidity of 90 percent, and the sample is alternately circulated at the temperature of 40-50 ℃ for 15 cycles every 1 hour. Weather resistance categories were classified according to the amount of turbidity change before and after sample placement, and weather resistance classification conditions are shown in table 1:
table 1.
In some embodiments, the optical glass of the present invention has a weatherability (CR) of 2 or more, preferably 1.
< Knoop hardness >
Knoop hardness of optical glass (H K ) According to GB/T7962.18-2010, and performing a test by using a test method specified in the specification.
In some embodiments, the optical glass of the present invention has a knoop hardness (H K ) 690×10 7 Pa or more, preferably 700×10 7 Pa or more, more preferably 710×10 7 Pa or more.
< Young's modulus >
Young's modulus (E) is obtained by measuring longitudinal wave velocity and transverse wave velocity by ultrasonic wave and calculating according to the following formula.
G＝V S 2 ρ
Wherein: e is Young's modulus, pa;
g is the shear modulus, pa;
V T is transverse wave speed, m/s;
V S is longitudinal wave speed, m/s;
ρ is the density of the glass, g/cm 3 。
In some embodiments, the Young's modulus (E) of the optical glass of the present invention has a lower limit of 10500×10 7 Pa, a preferable lower limit is 11000×10 7 Pa, and a lower limit of 11500×10 is more preferable 7 Pa。
In some embodiments, the Young's modulus (E) of the optical glass of the present invention has an upper limit of 14500X 10 7 Pa, the preferable upper limit is 14000×10 7 Pa, and more preferably an upper limit of 13500X 10 7 Pa。
< bubble degree >
The bubble degree of the optical glass was measured according to the method prescribed in GB/T7962.8-2010.
In some embodiments, the optical glass of the present invention has a bubble degree of class A or more, preferably class A 0 Above the stage, more preferably A 00 A stage.
[ method for producing optical glass ]
The manufacturing method of the optical glass comprises the following steps: the glass of the invention is produced by adopting conventional raw materials and processes, including but not limited to oxide, hydroxide, compound salt (such as carbonate, nitrate, sulfate and the like), boric acid and the like as raw materials, after being proportioned according to a conventional method, the proportioned furnace burden is put into a smelting furnace (such as a platinum or platinum alloy crucible) with the temperature of 1200-1450 ℃ to be smelted, and after clarification and homogenization, homogeneous molten glass without bubbles and undissolved substances is obtained, and the molten glass is cast in a mould and annealed. Those skilled in the art can appropriately select the raw materials, the process methods, and the process parameters according to actual needs.
[ glass preform and optical element ]
The optical glass thus produced may be used to produce a glass preform by direct drop molding, grinding, or compression molding such as hot press molding. That is, the glass preform may be produced by directly precision drop molding a molten optical glass into a glass precision preform, or by mechanical processing such as grinding and polishing, or by producing a preform for press molding from an optical glass, and then performing hot press molding and polishing on the preform. The means for producing the glass preform is not limited to the above-described 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 performing hot press molding, precision press molding, and the like to produce optical elements such as lenses and prisms.
The glass preform and the optical element of the present invention are each formed of the optical glass of the present invention described above. The glass preform of the present invention has excellent characteristics possessed by an optical glass; the optical element of the present invention has excellent characteristics of optical glass, and can provide various optical elements such as lenses and prisms having high optical value.
Examples of the lens include 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, each of which has a spherical or aspherical lens surface.
[ optical instrument ]
The optical element formed by the optical glass can be used for manufacturing optical instruments such as photographic equipment, image pickup equipment, projection equipment, display equipment, vehicle-mounted equipment, monitoring equipment and the like.
Examples
< example of optical glass >
In order to further clearly illustrate and describe the technical solutions of the present invention, the following non-limiting examples are provided.
In this example, optical glasses having compositions shown in tables 2 to 4 were obtained by using the above-described optical glass manufacturing method. The characteristics of each glass were measured by the test method of the present invention, and the measurement results are shown in tables 2 to 4.
Table 2.
/>
Table 3.
/>
Table 4.
/>
< example of glass preform >
The glasses obtained in examples 1 to 24 were subjected to polishing, re-hot press molding, and press molding such as precision press molding to prepare various kinds of lenses such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses, and preforms such as prisms.
< example of optical element >
The glass preforms obtained in the above examples were annealed, and the refractive index was fine-tuned while reducing the internal stress of the glass so that the optical characteristics such as refractive index reached the desired values.
Next, each preform was ground and polished to produce various lenses and prisms 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. The surface of the obtained optical element may be coated with an antireflection film.
< example of optical instrument >
The optical elements produced by the above-described optical element embodiments are useful, for example, in imaging devices, sensors, microscopes, medical technology, digital projection, communications, 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 optical components or optical assemblies using one or more optical elements.

Claims (20)

1. The optical glass is characterized by comprising the following components in percentage by weight: siO (SiO) 2 ：2～20％；B 2 O 3 ：3～20％；La 2 O 3 ：35～60％；Y 2 O 3 ：5～30％；ZrO 2 ：2～15％；Nb 2 O 5 ：1～15％；Ta 2 O 5 ：0～15％。
2. The optical glass according to claim 1, wherein the composition, expressed in weight percent, further comprises: gd (Gd) 2 O 3 : 0-8%; and/or TiO 2 : 0-5%; and/or RO: 0-8%; and/or Rn 2 O: 0-8%; and/or WO 3 : 0-5%; and/or ZnO: 0-8%; and/or Al 2 O 3 : 0-8%; and/or Yb 2 O 3 : 0-8%; and/or GeO 2 : 0-5%; and/or clarifying agent: 0 to 2 percent of RO is one or more of MgO, caO, srO, baO, rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O and a clarifying agent of Sb 2 O 3 、SnO、SnO 2 、CeO 2 One or more of the following.
3. An optical glass, characterized in that the components thereof are represented by weight percent and are composed of SiO 2 ：2～20％；B 2 O 3 ：3～20％；La 2 O 3 ：35～60％；Y 2 O 3 ：5～30％；ZrO 2 ：2～15％；Nb 2 O 5 ：1～15％；Ta 2 O 5 ：0～15％；Gd 2 O 3 ：0～8％；TiO 2 ：0～5％；RO：0～8％；Rn 2 O：0～8％；WO 3 ：0～5％；ZnO：0～8％；Al 2 O 3 ：0～8％；Yb 2 O 3 ：0～8％；GeO 2 : 0-5%; clarifying agent: 0 to 2 percent of the composition, wherein the RO is one or more of MgO, caO, srO, baO, rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O and a clarifying agent of Sb 2 O 3 、SnO、SnO 2 、CeO 2 One or more of the following.
4. An optical glass according to any one of claims 1 to 3, wherein the components thereof are expressed in weight percent, wherein: la (La) 2 O 3 +Y 2 O 3 +Gd 2 O 3 45 to 75%, preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 50 to 75%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 55 to 70%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 60 to 70 percent.
5. An optical glass according to any one of claims 1 to 3, wherein the components thereof are expressed in weight percent, wherein: y is Y 2 O 3 /B 2 O 3 From 0.5 to 5.0, preferably Y 2 O 3 /B 2 O 3 From 0.6 to 3.0, more preferably Y 2 O 3 /B 2 O 3 From 0.7 to 2.5, more preferably Y 2 O 3 /B 2 O 3 0.8 to 2.0.
6. An optical glass according to any one of claims 1 to 3, wherein the components thereof are expressed in weight percent, wherein: gd (Gd) 2 O 3 /(SiO 2 +B 2 O 3 ) Is 1.0 or less, preferably Gd 2 O 3 /(SiO 2 +B 2 O 3 ) Is 0.8 or less, more preferably Gd 2 O 3 /(SiO 2 +B 2 O 3 ) Is 0.5 or less, and further preferably Gd 2 O 3 /(SiO 2 +B 2 O 3 ) Is 0.3 or less.
7. An optical glass according to any one of claims 1 to 3, wherein the components thereof are expressed in weight percent, wherein: (La) 2 O 3 +Y 2 O 3 )/ZrO 2 Is 4.0 or more, preferably (La 2 O 3 +Y 2 O 3 )/ZrO 2 Is 5.0 to 20.0, more preferably (La) 2 O 3 +Y 2 O 3 )/ZrO 2 Is 6.0 to 13.0, more preferably (La) 2 O 3 +Y 2 O 3 )/ZrO 2 7.0 to 11.0.
8. An optical glass according to any one of claims 1 to 3, wherein the components thereof are expressed in weight percent, wherein: y is Y 2 O 3 /(Ta 2 O 5 +ZnO) of 0.5 to 8.0, preferably Y 2 O 3 /(Ta 2 O 5 +ZnO) of 0.7 to 5.0, more preferably Y 2 O 3 /(Ta 2 O 5 +ZnO) is 0.8 to 4.0, more preferably Y 2 O 3 /(Ta 2 O 5 +ZnO) is 1.0 to 3.0.
9. An optical glass according to any one of claims 1 to 3, wherein the components thereof are expressed in weight percent, wherein: la (La) 2 O 3 /Nb 2 O 5 At least 3.0, preferably La 2 O 3 /Nb 2 O 5 From 4.0 to 30.0, more preferably La 2 O 3 /Nb 2 O 5 From 5.0 to 20.0, la being more preferred 2 O 3 /Nb 2 O 5 6.0 to 12.0.
10. An optical glass according to any one of claims 1 to 3, wherein the components thereof are expressed in weight percent, wherein: (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 0.3 to 8.0, preferably (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 0.5 to 6.0, more preferably (Ta 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 0.6 to 5.0, more preferably (Ta 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 0.8 to 3.0.
11. An optical glass according to any one of claims 1 to 3, wherein the components thereof are expressed in weight percent, wherein: (TiO) 2 +WO 3 )/Y 2 O 3 Is 1.0 or less, preferably (TiO) 2 +WO 3 )/Y 2 O 3 Is 0.8 or less, more preferably (TiO) 2 +WO 3 )/Y 2 O 3 Is 0.5 or less, more preferably (TiO) 2 +WO 3 )/Y 2 O 3 Is 0.1 or less.
12. An optical glass according to any one of claims 1 to 3, wherein the components thereof are expressed in weight percent, wherein: (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 1.0 or less, preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.8 or less, more preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.5 or less, more preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.3 or less.
13. An optical glass according to any one of claims 1 to 3, wherein the components thereof are expressed in weight percent, wherein: siO (SiO) 2 :3 to 15%, preferably SiO 2 : 4-10%; and/or B 2 O 3 :5 to 15%, preferably B 2 O 3 : 7-13%; and/or La 2 O 3 :38 to 60%, preferably La 2 O 3 : 41-55%; and/or Y 2 O 3 :7 to 24%, preferably Y 2 O 3 :8 to 22%, more preferably Y 2 O 3 : 11-22%; and/or ZrO 2 :3 to 13%, preferably ZrO 2 : 4-10%; and/or Nb 2 O 5 :2 to 10%, preferably Nb 2 O 5 : 3-8%; and/or Ta 2 O 5 :2 to 12%, preferably Ta 2 O 5 : 5-10%; and/or Gd 2 O 3 :0 to 5%, preferably Gd 2 O 3 :0 to 3 percent; and/or TiO 2 :0 to 3%, preferably TiO 2 :0 to 2 percent; and/or RO: 0-3%, preferably RO:0 to 2 percent; and/or Rn 2 O:0 to 3%, preferably Rn 2 O:0 to 2 percent; and/or WO 3 :0 to 3%, preferably WO 3 :0 to 2 percent; and/or ZnO:0 to 4%, preferably ZnO:0 to 2 percent; and/or Al 2 O 3 :0 to 4%, preferably Al 2 O 3 :0 to 2 percent; and/or Yb 2 O 3 :0 to 5%, preferably Yb 2 O 3 :0 to 3 percent; and/or GeO 2 :0 to 3%, preferably GeO 2 :0 to 1 percent; and/or clarifying agent: 0-1%, preferably clarifying agent: 0 to 0.5 percent, the RO is one or more of MgO, caO, srO, baO and Rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O and a clarifying agent of Sb 2 O 3 、SnO、SnO 2 、CeO 2 One or more of the following.
14. An optical glass according to any one of claims 1 to 3, wherein the component does not contain WO 3 The method comprises the steps of carrying out a first treatment on the surface of the And/or does not contain TiO 2 The method comprises the steps of carrying out a first treatment on the surface of the And/or does not contain RO; and/or does not contain Rn 2 O; and/or contain no ZnO; and/or does not contain Al 2 O 3 The method comprises the steps of carrying out a first treatment on the surface of the And/or does not contain GeO 2 The RO is one or more of MgO, caO, srO, baO, rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O.
15. An optical glass according to any one of claims 1 to 3, wherein the components are expressed in weight percent as SiO 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 、Nb 2 O 5 、Ta 2 O 5 The total content of (2) is 85% or more, preferably SiO 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 、Nb 2 O 5 、Ta 2 O 5 The total content of (2) is 88% or more, more preferably SiO 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 、Nb 2 O 5 、Ta 2 O 5 The total content of (2) is 90% or more, further preferably SiO 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 、Nb 2 O 5 、Ta 2 O 5 The total content of (2) is 95% or more.
16. An optical glass according to any one of claims 1 to 3, wherein the refractive index n of the optical glass d From 1.86 to 1.92, preferably from 1.87 to 1.91, more preferably from 1.88 to 1.90, abbe number v d 36 to 44, preferably 38 to 43, more preferably 39 to 42.
17. An optical glass according to any one of claims 1 to 3, wherein the optical glass has a density ρ of 5.20g/cm 3 Hereinafter, it is preferably 5.15g/cm 3 Hereinafter, more preferably 5.10g/cm 3 The following are set forth; and/or coefficient of thermal expansion alpha 20/120℃ 85X 10 -7 Preferably 80X 10, and K is less than or equal to -7 Preferably 75X 10 or less per K -7 and/K or below; and/or stability against water action D W More than 2 types, preferably 1 type; and/or lambda 70 Is 400nm or less, preferably lambda 70 Is 390nm or less, more preferably lambda 70 385nm or less; and/or lambda 5 Is 340nm or less, preferably lambda 5 330nm or less, more preferably lambda 5 Is 325nm or less; and/or weather resistance CR is 2 or more, preferably 1; and/or knoop hardness H K 690×10 7 Pa or more, preferably 700×10 7 Pa or more, more preferably 710×10 7 Pa or more; and/or Young's modulus E of 10500×10 7 Pa～14500×10 7 Pa, preferably 11000X 10 7 Pa～14000×10 7 Pa, more preferably 11500X 10 7 Pa～13500×10 7 Pa; and/or the degree of air bubbles is a class A or more, preferably A 0 Above the stage, more preferably A 00 A stage.
18. A glass preform produced by using the optical glass according to any one of claims 1 to 17.
19. An optical element, characterized in that it is made of the optical glass according to any one of claims 1 to 17 or made of the glass preform according to claim 18.
20. An optical instrument comprising the optical glass according to any one of claims 1 to 17 and/or the optical element according to claim 19.
CN202211030904.XA 2022-08-26 2022-08-26 Optical glass, glass preform, optical element, and optical instrument Pending CN117658445A (en)

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