CN115385570A - High refractive index optical glass - Google Patents
High refractive index optical glass Download PDFInfo
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- CN115385570A CN115385570A CN202211031174.5A CN202211031174A CN115385570A CN 115385570 A CN115385570 A CN 115385570A CN 202211031174 A CN202211031174 A CN 202211031174A CN 115385570 A CN115385570 A CN 115385570A
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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
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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
- G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
Abstract
The invention provides a high-refractive-index optical glass, which comprises the following components in percentage by weight: siO 2 2 ：1～15％；B 2 O 3 ：5～25％；La 2 O 3 ：35～65％；Y 2 O 3 ：4～25％；ZrO 2 ：2～15％；Nb 2 O 5 :3 to 20% of (SiO) 2 +Y 2 O 3 )/B 2 O 3 Is 0.5 to 5.0. Through reasonable component design, the optical glass has excellent bubble degree while having the expected refractive index and Abbe number.
Description
Technical Field
The present invention relates to an optical glass, and more particularly to a high refractive index optical glass excellent in a bubble fraction, and a glass preform, an optical element and an optical instrument made of the same.
Background
In recent years, various optical instruments such as digital cameras, video cameras, projectors, and projection televisions have been advancing to digitalize and increase the definition, and in order to realize miniaturization and weight reduction of the optical instruments, it is necessary to reduce the number of lenses and prisms used in an optical system. The high refractive index optical glass has a wide range of demands because it can obtain a large viewing angle with a small volume, thereby reducing the number of optical glasses used in optical instruments. In the case of optical glass, the refractive index and Abbe number are core optical characteristics. The refractive index and the Abbe number determine the basic functions of the glass, the optical glass needs to have excellent internal quality (stripes, bubbles, inclusions and the like) besides the expected optical performance, and if the component design of the optical glass is not reasonable, a large amount of bubbles exist in the glass, so that the glass is scrapped.
Disclosure of Invention
The invention aims to provide high-refractive-index optical glass with excellent bubble degree.
The technical scheme adopted by the invention for solving the technical problem is as follows:
(1) The high-refractive-index optical glass comprises the following components in percentage by weight: siO 2 2 ：1～15％；B 2 O 3 ：5～25％；La 2 O 3 ：35～65％；Y 2 O 3 ：4～25％；ZrO 2 ：2～15％；Nb 2 O 5 :3 to 20 percent of (SiO) 2 +Y 2 O 3 )/B 2 O 3 0.5 to 5.0.
(2) The high refractive index optical glass according to (1), which comprises the following components in percentage by weight: gd (Gd) 2 O 3 :0 to 10 percent; and/or TiO 2 :0 to 10 percent; and/or Ta 2 O 5 :0 to 5 percent; and/or RO:0 to 8 percent; and/or Rn 2 O:0 to 8 percent; and/or WO 3 :0 to 5 percent; and/or ZnO:0 to 10 percent; and/or Al 2 O 3 :0 to 8 percent; and/or Yb 2 O 3 :0 to 10 percent; and/or GeO 2 :0 to 5 percent; and/or a clarifying agent: 0-2%, RO is one or more of MgO, caO, srO and BaO, rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O and Sb as clarifier 2 O 3 、SnO、SnO 2 、CeO 2 One or more of (a).
(3) High refractive index optical glass containing SiO 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 And Nb 2 O 5 The components of which are expressed in weight percent, wherein 2 +Y 2 O 3 )/B 2 O 3 0.5 to 5.0, the refractive index n of the optical glass d Is 1.87 to 1.94, abbe number v d 33 to 41 and the degree of air bubbles is above class A.
(4) The optical glass according to (3), which comprises the following components in percentage by weight: siO 2 2 :1 to 15 percent; and/or B 2 O 3 :5 to 25 percent; and/or La 2 O 3 :35 to 65 percent; and/or Y 2 O 3 :4 to 25 percent; and/or ZrO 2 :2 to 15 percent; and/or Nb 2 O 5 :3 to 20 percent; and/or Gd 2 O 3 :0 to 10 percent; and/or TiO 2 :0 to 10 percent; and/or Ta 2 O 5 :0 to 5 percent; and/or RO:0 to 8 percent; and/or Rn 2 O:0 to 8 percent; and/or WO 3 :0 to 5 percent; and/or ZnO:0 to 10 percent; and/or Al 2 O 3 :0 to 8 percent; and/or Yb 2 O 3 :0 to 10 percent; and/or GeO 2 :0 to 5 percent; and/or a clarifying agent: 0-2%, RO is one or more of MgO, caO, srO and BaO, rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O and Sb as clarifier 2 O 3 、SnO、SnO 2 、CeO 2 One or more of (a).
(5) The high refractive index optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: 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 Is 50 to 75%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 Is 55 to 70%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 60 to 70 percent; and/or (SiO) 2 +Y 2 O 3 )/B 2 O 3 0.7 to 3.0, preferably (SiO) 2 +Y 2 O 3 )/B 2 O 3 Is 1.0 to 2.5, more preferably (SiO) 2 +Y 2 O 3 )/B 2 O 3 1.0 to 2.0; and/or Y 2 O 3 /(SiO 2 +ZrO 2 ) 0.3 to 3.5, preferably Y 2 O 3 /(SiO 2 +ZrO 2 ) Is 0.4 to 3.0, more preferably Y 2 O 3 /(SiO 2 +ZrO 2 ) Is 0.5 to 2.5, and Y is more preferably 2 O 3 /(SiO 2 +ZrO 2 ) 0.5 to 2.0; and/or (Y) 2 O 3 +Nb 2 O 5 )/La 2 O 3 Is 0.2 to 1.0, preferably (Y) 2 O 3 +Nb 2 O 5 )/La 2 O 3 Is 0.25 to 0.8, more preferably (Y) 2 O 3 +Nb 2 O 5 )/La 2 O 3 Is 0.3 to 0.7, more preferably (Y) 2 O 3 +Nb 2 O 5 )/La 2 O 3 0.35 to 0.65; and/or Nb 2 O 5 /B 2 O 3 0.2 to 2.5, preferably Nb 2 O 5 /B 2 O 3 Is 0.4 to 2.0, more preferably Nb 2 O 5 /B 2 O 3 Is 0.5 to 1.8, and Nb is more preferable 2 O 5 /B 2 O 3 Is 0.6 to 1.5.
(6) The high refractive index optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: tiO 2 2 /(Y 2 O 3 +Nb 2 O 5 ) Is 1.0 or less, preferably TiO 2 /(Y 2 O 3 +Nb 2 O 5 ) Is 0.8 or less, and TiO is more preferable 2 /(Y 2 O 3 +Nb 2 O 5 ) Is 0.5 or less, and TiO is more preferable 2 /(Y 2 O 3 +Nb 2 O 5 ) Is 0.3 or less; and/or (RO + Rn) 2 O)/SiO 2 Is 1.5 or less, preferably (RO + Rn) 2 O)/SiO 2 Is 1.0 or less, more preferably (RO + Rn) 2 O)/SiO 2 Is 0.8 or less, more preferably (RO + Rn) 2 O)/SiO 2 Is 0.5 or less; and/or ZnO/Y 2 O 3 Is 1.0 or less, preferably ZnO/Y 2 O 3 Is 0.8 or less, and ZnO/Y is more preferable 2 O 3 Is 0.5 or less, and ZnO/Y is more preferable 2 O 3 Is 0.2 or less; and/or (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 2.0 or less, preferably (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 1.5 or less, more preferably (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 1.0 or less, more preferably (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 The RO is one or more of MgO, caO, srO and BaO, and Rn is less than 0.8 2 O is Li 2 O、Na 2 O、K 2 One or more of O.
(7) The high refractive index optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: siO 2 2 :2 to 12%, preferably SiO 2 :4 to 10 percent; and/or B 2 O 3 :7 to 20%, preferably B 2 O 3 :9 to 16 percent; and/or La 2 O 3 :40 to 60%, preferably La 2 O 3 :42 to 55 percent; and/or Y 2 O 3 :6 to 22%, preferably Y 2 O 3 :8 to 20%, more preferably Y 2 O 3 :11 to 20 percent; and/or Gd 2 O 3 :0 to 7%, preferably Gd 2 O 3 :0 to 5 percent; and/or ZrO 2 :3 to 12%, preferably ZrO 2 :4 to 10 percent; and/or Nb 2 O 5 :5 to 15%, preferably Nb 2 O 5 :7 to 11 percent; and/or Ta 2 O 5 :0 to 3%, preferably Ta 2 O 5 :0 to 1 percent; and/or TiO 2 :0 to 8%, preferably TiO 2 :0 to 5 percent; and/or RO:0 to 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 5%, 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 a clarifying agent: 0 to 1%, preferably a clarifying agent: 0 to 0.5 percent of the total weight of the catalyst, wherein the RO is one or more of MgO, caO, srO and BaO, and Rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O and Sb as clarifier 2 O 3 、SnO、SnO 2 、CeO 2 One or more of (a).
(8) According to (1) & gt(4) Any of the high refractive index optical glasses does not contain WO in the components 3 (ii) a And/or does not contain Ta 2 O 5 (ii) a And/or does not contain RO; and/or does not contain Rn 2 O; and/or does not contain ZnO; and/or does not contain Al 2 O 3 (ii) a And/or does not contain GeO 2 The RO is one or more of MgO, caO, srO and BaO, and Rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O.
(9) The high refractive index optical glass according to any one of (1) to (4), wherein the refractive index n of the high refractive index optical glass d Is 1.87 to 1.94, preferably 1.88 to 1.92, more preferably 1.89 to 1.91, abbe number v d 33 to 41, preferably 35 to 40, more preferably 36 to 39.
(10) The high refractive index optical glass according to any one of (1) to (4), which has a thermal expansion coefficient α 20/120℃ Is 95X 10 -7 Preferably 90X 10 or less,/K -7 A value of 80X 10 or less in terms of/K or less -7 below/K; and/or stability against water action D W Is 2 or more, preferably 1; and/or lambda 70 Is 410nm or less, preferably λ 70 Is 400nm or less, more preferably lambda 70 Is below 395 nm; and/or lambda 5 Is 370nm or less, preferably λ 5 Is 360nm or less, more preferably lambda 5 Is below 355 nm; and/or the weather resistance CR is of class 2 or more, preferably of class 1; and/or Knoop hardness H K Is 670X 10 7 Pa or more, preferably 680X 10 7 Pa or more, more preferably 690X 10 7 Pa or above; and/or a Young's modulus E of 10000X 10 7 Pa～14000×10 7 Pa, preferably 11000X 10 7 Pa～13500×10 7 Pa, more preferably 11500X 10 7 Pa～13000×10 7 Pa; and/or the degree of bubbling is class A or more, preferably class A 0 More preferably A or more 00 And (4) stage.
(11) A glass preform made of the high refractive index optical glass according to any one of (1) to (10).
(12) An optical element produced from the high refractive index optical glass according to any one of (1) to (10), or the glass preform according to (11).
(13) An optical device comprising the high refractive index optical glass according to any one of (1) to (10) and/or the optical element according to (12).
The beneficial effects of the invention are: through reasonable component design, the optical glass has excellent bubble degree while having the expected refractive index and Abbe number.
Detailed Description
The embodiments of the high refractive index optical glass of the present invention will be described in detail below, but the present invention is not limited to the embodiments described below, and can be implemented by making appropriate changes within the scope of the object of the present invention. Although the description of the overlapping portions may be omitted as appropriate, the invention is not limited thereto, and the high refractive index optical glass of the present invention may be simply referred to as optical glass or glass in the following description.
[ high refractive index optical glass ]
The ranges of the respective components (components) of the high refractive index 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 only A, or only B, or both A and B.
< essential Components and optional Components >
SiO 2 Has the functions of regulating optical constant, improving chemical stability of glass, maintaining viscosity suitable for molten glass, reducing abrasion degree and resisting corrosion to refractory material, and contains SiO in 1% or more 2 To obtain the above effects, siO is preferable 2 The content of (A) is 2% or more, and SiO is more preferable 2 The content of (A) is more than 4%. If SiO 2 Too high a content of (b) increases the difficulty of melting the glass and increases the transition temperature. Thus, siO in the present invention 2 The upper limit of the content of (b) is 15%, preferably 12%, more preferably 10%.
B 2 O 3 Can improve the melting property and devitrification resistance of the glass and is beneficial to reducing the transition temperature of the glass, and the invention contains more than 5 percent of B 2 O 3 In order to obtain the above effects, it is preferable to contain 7% or more of B 2 O 3 More preferably 9% or more of B 2 O 3 . If B is 2 O 3 If the content of (b) is too high, the chemical stability of the glass is deteriorated, particularly the water resistance is deteriorated, and the refractive index and the light transmittance of the glass are lowered. Thus, B 2 O 3 The content of (b) is 25% or less, preferably 20% or less, more preferably 16% or less.
La 2 O 3 The glass is an effective component for improving the refractive index of the glass, has obvious effects on improving the chemical stability and the devitrification resistance of the glass, and cannot reach the required optical constant if the content of the glass is less than 35 percent; if the content is more than 65%, the devitrification tendency of the glass is rather increased and the thermal stability is deteriorated. Thus, la 2 O 3 The content of (b) is limited to 35 to 65%, preferably 40 to 60%, more preferably 42 to 55%.
Y 2 O 3 The invention can improve the refractive index and devitrification resistance of the glass and adjust the Young's modulus of the glass by containing more than 4 percent of Y 2 O 3 To obtain the above effects; if the content exceeds 25%, the chemical stability and weather resistance of the glass are deteriorated. Thus, Y in the present invention 2 O 3 The content of (b) is 4 to 25%, preferably 6 to 22%, more preferably 8 to 20%, and still more preferably 11 to 20%.
In some embodiments, the SiO is 2 And Y 2 O 3 SiO (total content) 2 +Y 2 O 3 And B 2 O 3 In the middle of ratio of (SiO) 2 +Y 2 O 3 )/B 2 O 3 The bubble degree and the light transmittance of the glass can be improved by controlling the content of the glass to be within the range of 0.5-5.0. Therefore, (SiO) is preferable 2 +Y 2 O 3 )/B 2 O 3 Is 0.5 to 5.0, more preferably (SiO) 2 +Y 2 O 3 )/B 2 O 3 0.7 to 3.0. Further, control (SiO) 2 +Y 2 O 3 )/B 2 O 3 The hardness of the glass can be further optimized within the range of 1.0 to 2.5. Therefore, (SiO) is more preferable 2 +Y 2 O 3 )/B 2 O 3 Is 1.0 to 2.5, and (SiO) is more preferable 2 +Y 2 O 3 )/B 2 O 3 Is 1.0 to 2.0.
Gd 2 O 3 The refractive index and chemical stability of the glass can be improved, but if the content thereof is more than 10%, devitrification resistance and abrasion resistance of the glass are deteriorated. Thus, gd 2 O 3 The content of (B) is 0 to 10%, preferably 0 to 7%, more preferably 0 to 5%.
In some embodiments, by passing La 2 O 3 、Y 2 O 3 And Gd 2 O 3 Total content La of 2 O 3 +Y 2 O 3 +Gd 2 O 3 Controlled in the range of 45 to 75%, the glass is easier to obtain the desired refractive index and Abbe number, and the devitrification resistance and weather resistance of the glass are optimized. Therefore, la is preferable 2 O 3 +Y 2 O 3 +Gd 2 O 3 From 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 And is a component imparting high-refractivity, low-dispersion properties to the glass, and if the content thereof exceeds 10%, the devitrification resistance of the glass is lowered. Thus, yb 2 O 3 The content of (B) is 0 to 10%, preferably 0 to 5%, more preferably 0 to 3%, and further preferably Yb is not 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 2 2 When the content of (b) is too high, devitrification resistance of the glass is lowered, melting difficulty is increased, melting temperature is increased, and inclusions appear in the glass and light transmittance is lowered. Thus, zrO in the invention 2 The content of (b) is 2 to 15%, preferably 3 to 12%, more preferably 4 to 10%.
In some embodiments, Y is 2 O 3 Content of (D) and SiO 2 And ZrO 2 SiO (total content) 2 +ZrO 2 Ratio Y therebetween 2 O 3 /(SiO 2 +ZrO 2 ) The abrasion degree of the glass can be optimized and the hardness of the glass can be prevented from being reduced by controlling the abrasion degree of the glass within the range of 0.3-3.5. Therefore, Y is preferred 2 O 3 /(SiO 2 +ZrO 2 ) Is 0.3 to 3.5, and Y is more preferably 2 O 3 /(SiO 2 +ZrO 2 ) 0.4 to 3.0. Further, Y is 2 O 3 /(SiO 2 +ZrO 2 ) The control range of 0.5-2.5 can further optimize the weather resistance and Young modulus of the glass. Therefore, Y is more preferable 2 O 3 /(SiO 2 +ZrO 2 ) Is 0.5 to 2.5, and Y is more preferably 2 O 3 /(SiO 2 +ZrO 2 ) 0.5 to 2.0.
Nb 2 O 5 Is a high-refraction high-dispersion component, can improve the refractive index and the devitrification resistance of the glass and reduce the thermal expansion coefficient of the glass, and the invention contains more than 3 percent of Nb 2 O 5 To obtain the above effects, nb is preferable 2 O 5 The lower limit of (B) is 5%, and the more preferable lower limit is 7%. If Nb 2 O 5 In an amount exceeding 20%, the glass is lowered in thermal stability and weather resistance, and the light transmittance is lowered, so that Nb in the present invention is 2 O 5 The upper limit of the content of (b) is 20%, preferably 15%, more preferably 11%.
In some embodiments, Y is 2 O 3 And Nb 2 O 5 Total content of (3) and La 2 O 3 Ratio between contents of (Y) 2 O 3 +Nb 2 O 5 )/La 2 O 3 The control is in the range of 0.2-1.0, which is beneficial to improving the hardness and the light transmittance of the glass. Therefore, (Y) is preferable 2 O 3 +Nb 2 O 5 )/La 2 O 3 Is 0.2 to 1.0, more preferably (Y) 2 O 3 +Nb 2 O 5 )/La 2 O 3 0.25 to 0.8. Further, will (Y) 2 O 3 +Nb 2 O 5 )/La 2 O 3 The Young modulus and the bubble degree of the glass can be further optimized by controlling the Young modulus to be within the range of 0.3-0.7. Therefore, (Y) is more preferable 2 O 3 +Nb 2 O 5 )/La 2 O 3 Is 0.3 to 0.7, more preferably (Y) 2 O 3 +Nb 2 O 5 )/La 2 O 3 0.35 to 0.65.
In some embodiments, nb is 2 O 5 Content of (A) and (B) 2 O 3 Ratio Nb between contents of 2 O 5 /B 2 O 3 The chemical stability and the light transmittance of the glass can be optimized by controlling the content of the glass to be between 0.2 and 2.5. Therefore, nb is preferable 2 O 5 /B 2 O 3 Is 0.2 to 2.5, more preferably Nb 2 O 5 /B 2 O 3 0.4 to 2.0. Further, nb is 2 O 5 /B 2 O 3 The bubble degree and the thermal expansion coefficient of the glass can be further optimized by controlling the temperature to be within the range of 0.5-1.8. Therefore, nb is more preferable 2 O 5 /B 2 O 3 0.5 to 1.8, and Nb is more preferable 2 O 5 /B 2 O 3 0.6 to 1.5.
TiO 2 Can liftHigh refractive index glasses, but too high a content, greatly reduce the Abbe number and increase the tendency to devitrify, even make the glass visibly colored. Thus, tiO 2 The content is limited to 0 to 10%, preferably 0 to 8%, more preferably 0 to 5%.
In some embodiments, the TiO is 2 Content of (A) and Y 2 O 3 And Nb 2 O 5 Of (2) TiO 2 /(Y 2 O 3 +Nb 2 O 5 ) When the content is controlled to 1.0 or less, the crystallization resistance and weather resistance of the glass can be improved. Therefore, tiO is preferred 2 /(Y 2 O 3 +Nb 2 O 5 ) Is 1.0 or less, and TiO is more preferable 2 /(Y 2 O 3 +Nb 2 O 5 ) Is 0.8 or less. Further, tiO is added 2 /(Y 2 O 3 +Nb 2 O 5 ) The thermal expansion coefficient and hardness of the glass can be further optimized by controlling the content of the glass to be less than 0.5. Therefore, tiO is more preferable 2 /(Y 2 O 3 +Nb 2 O 5 ) Is 0.5 or less, and TiO is more preferable 2 /(Y 2 O 3 +Nb 2 O 5 ) Is 0.3 or less.
The alkaline earth metal oxide RO (RO is one or more of MgO, caO, srO, and BaO) can adjust the optical constants of the glass to optimize the chemical stability of the glass, but when the content thereof is high, the devitrification resistance of the glass is lowered. Therefore, the RO content is limited to 0 to 8%, preferably 0 to 3%, and more preferably 0 to 2%. In some embodiments, it is further preferred that no RO is present.
Alkali metal oxide Rn 2 O(Rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O) may lower the transition temperature of the glass, adjust the optical constants and high-temperature viscosity of the glass, and improve the melting property of the glass, but when the content is high, the devitrification resistance and chemical stability of the glass are lowered. 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。
In some embodimentsIn (1), RO and Rn 2 Total content of O RO + Rn 2 O and SiO 2 Ratio between contents of (RO + Rn) 2 O)/SiO 2 The control below 1.5 can optimize the weather resistance and the striae degree of the glass, so that the glass can obtain the proper Young modulus more easily. Therefore, (RO + Rn) is preferable 2 O)/SiO 2 Is 1.5 or less, more preferably (RO + Rn) 2 O)/SiO 2 Is 1.0 or less, and more preferably (RO + Rn) 2 O)/SiO 2 Is 0.8 or less, more preferably (RO + Rn) 2 O)/SiO 2 Is 0.5 or less.
WO 3 Can improve the refractive index and mechanical strength of the glass, if WO 3 When the content of (B) exceeds 5%, the glass is deteriorated in thermal stability and devitrification resistance. Thus, WO 3 The upper limit of the content of (B) is 5%, preferably 3%, more preferably 2%. In some embodiments, it is further preferred not to contain WO 3 。
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 content of ZnO is too high, the glass forming difficulty is increased, and the devitrification resistance is deteriorated. Accordingly, the content of ZnO is 0 to 10%, preferably 0 to 5%, more preferably 0 to 2%. In some embodiments, it is further preferred that no ZnO is present.
In some embodiments, the amount of ZnO is related to Y 2 O 3 Ratio between contents of (3) ZnO/Y 2 O 3 The bubble degree and the chemical stability of the glass can be improved, the thermal expansion coefficient of the glass is reduced, and the abrasion degree of the glass is optimized by controlling the bubble degree and the chemical stability of the glass to be less than 1.0. Therefore, znO/Y is preferred 2 O 3 Is 1.0 or less, and ZnO/Y is more preferable 2 O 3 Is 0.8 or less, and ZnO/Y is more preferable 2 O 3 Is 0.5 or less, and ZnO/Y is more preferable 2 O 3 Is 0.2 or less.
Ta 2 O 5 The glass has the effects of improving the refractive index and 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 is compared with other components 2 O 5 Is very expensiveExpensive, and the amount of the catalyst used should be minimized from the practical and cost viewpoints. Thus, ta in the present invention 2 O 5 The content of (b) is limited to 0 to 5%, preferably 0 to 3%, more preferably 0 to 1%. In some embodiments, it is further preferred that Ta is not included 2 O 5 。
In some embodiments, by reacting Ta 2 O 5 And Gd 2 O 3 Total content Ta of 2 O 5 +Gd 2 O 3 And Nb 2 O 5 Ratio between contents of (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Controlling the thermal expansion coefficient to 2.0 or less can improve the chemical stability of the glass and reduce the thermal expansion coefficient of the glass. Therefore, (Ta) is preferable 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 2.0 or less, more preferably (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 1.5 or less. Further, it is preferable to use (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Below 1.0, it is advantageous to optimize the density and Young's modulus of the glass. Therefore, (Ta) is more preferable 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 1.0 or less, more preferably (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 0.8 or less.
Al 2 O 3 The chemical stability of the glass can be improved, but when the content thereof exceeds 8%, the melting property and light transmittance of the glass are deteriorated. Therefore, al in the present invention 2 O 3 The content of (B) is 0 to 8%, preferably 0 to 4%, more preferably 0 to 2%. In some embodiments, it is further preferred that Al is not present 2 O 3 。
GeO 2 Has the functions of improving the refractive index and resisting devitrification, but if the content is too high, the chemical stability of the glass is reduced; on the other hand, geO is compared with other components 2 The price of (2) is very expensive, and the amount of use should be minimized from the practical and cost viewpoints. Accordingly, geO in the present invention 2 The content of (b) is limited to 0 to 5%, preferably 0 to 3%, more preferably 0 to 1%, and further 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 One or more components in the glass can be used as a clarifying agent to improve the clarifying effect of the glass and improve the bubble degree of the glass, and the content of the clarifying agent is preferably 0 to 1 percent, and more preferably 0 to 0.5 percent. Since the optical glass of the present invention is excellent in the degree of foaming due to its rational component kinds and contents, it is further preferable in some embodiments that no fining agent is contained. When Sb is present 2 O 3 At contents exceeding 2%, the glass tends to have a reduced fining ability, and since the strong oxidizing action promotes the corrosion of the platinum or platinum alloy vessel from which the glass is melted and the deterioration of the forming mold, sb is preferred in the present invention 2 O 3 The content of (B) is 0 to 2%, more preferably 0 to 1%, still more preferably 0 to 0.5%, and still more preferably Sb is not contained 2 O 3 . SnO and SnO 2 However, when the content exceeds 2%, the glass tends to be colored, or when the glass is heated, softened, and subjected to re-molding such as press molding, sn becomes a starting point of crystal nucleus formation, and devitrification tends to occur. Thus the SnO of the invention 2 The content of (B) is preferably 0 to 2%, more preferably 0 to 1%, still more preferably 0 to 0.5%, and still more preferably not containing SnO 2 (ii) a The SnO content is preferably 0 to 2%, more preferably 0 to 1%, still more preferably 0 to 0.5%, and still more preferably no SnO. CeO (CeO) 2 The function and content ratio of (A) and (B) of SnO 2 The content is preferably 0 to 2%, more preferably 0 to 1%, even more preferably 0 to 0.5%, and even more preferably no CeO 2 。
< 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 under control, and measures for protecting the environment are required not only in the glass production process but also in the processing process and in the disposal after the production of products. 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 disposed of without taking special measures for environmental measures.
In order to achieve environmental friendliness, the optical glass of the present invention preferably does not contain As 2 O 3 And PbO.
"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 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 high refractive index optical glass of the present invention will be described below.
< refractive index and Abbe number >
Refractive index (n) of optical glass d ) And Abbe number (. Nu.) 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 invention d ) The lower limit of (b) is 1.87, preferably 1.88, more preferably 1.89.
In some embodiments, the refractive index (n) of the optical glass of the present invention d ) The upper limit of (2) is 1.94, preferably 1.92, more preferably 1.91.
In some embodiments, the optical glasses of the present inventionAbbe number (v) of glass d ) The lower limit of (2) is 33, preferably 35, more preferably 36.
In some embodiments, the Abbe number (. Nu.s) of the optical glass of the present invention d ) The upper limit of (2) is 41, preferably 40, and more preferably 39.
< coefficient of thermal expansion >
Coefficient of thermal expansion (alpha) of optical glass 20/120℃ ) The data at 20-120 ℃ were measured according to the method specified in GB/T7962.16-2010.
In some embodiments, the optical glass of the present invention has a coefficient of thermal expansion (α) 20/120℃ ) Is 95X 10 -7 Preferably 90X 10 or less,/K -7 A value of 80X 10 or less, more preferably 80K or less -7 The ratio of the sulfur to the sulfur is below K.
< stability against Water Effect >
Stability to Water action of optical glasses (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.
< degree of coloration >
Coloring degree (. Lamda.) for short-wave transmittance spectral characteristics of the glass of the present invention 70 And λ 5 ) And (4) showing. Lambda 70 The wavelength corresponding to the glass transmittance of 70% is meant. Lambda 70 Is measured using a glass having a thickness of 10 + -0.1 mm with two opposing planes parallel to each other and optically polished, measuring a spectral transmittance in a wavelength region from 280nm to 700nm and exhibiting a wavelength of transmittance of 70%. The spectral transmittance or transmittance is the intensity I of light incident perpendicularly to the surface of the glass in Light transmitted through the glass and having an intensity I emitted from a plane out In the case of light of (1) through (I) out /I in The quantities expressed and also the transmission 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 glasses, λ 70 A small value of (A) means that the glass itself is colored very little and has a high light transmittance.
In some embodiments, the λ of the optical glass of the present invention 70 Is 410nm or less, preferably λ 70 Is 400nm or less, more preferably lambda 70 Is 395nm or less.
In some embodiments, the λ of the optical glass of the present invention 5 Is 370nm or less, preferably λ 5 Is 360nm or less, more preferably lambda 5 Is 355nm or less.
< weather resistance >
The test method of the weatherability (CR) of the optical glass is as follows: the sample is placed in a test box in a saturated water vapor environment with the relative humidity of 90 percent, and is circulated alternately at intervals of 1h at the temperature of 40-50 ℃ for 15 periods. The weather resistance categories were classified according to the amount of change in turbidity before and after the sample was left, and the weather resistance categories 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 or more.
< Knoop hardness >
Knoop hardness (H) of optical glass K ) 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 invention K ) Is 670 multiplied by 10 7 Pa or more, preferably 680X 10 7 Pa or more, more preferably 690X 10 7 Pa or above.
< Young's modulus >
The Young modulus (E) is obtained by testing the longitudinal wave speed and the transverse wave speed of the Young modulus by adopting ultrasonic waves and then calculating according to the following formula.
G＝V S 2 ρ
In the formula: e is Young's modulus, pa;
g is shear modulus, pa;
V T is the transverse wave velocity, m/s;
V S is the longitudinal wave velocity, m/s;
rho is the density of the glass, g/cm 3 。
In some embodiments, the lower limit of the Young's modulus (E) of the optical glass of the present invention is 10000X 10 7 Pa, preferably lower limit of 11000X 10 7 Pa, more preferably a lower limit of 11500X 10 7 Pa。
In some embodiments, the Young's modulus (E) of the optical glass of the present invention has an upper limit of 14000X 10 7 Pa, preferably upper limit of 13500X 10 7 Pa, more preferably the upper limit is 13000X 10 7 Pa。
< degree of bubbling >
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 degree of foaming of class A or more, preferably class A 0 More preferably A or more 00 And (4) stages.
[ method for producing optical glass ]
The method for manufacturing the high-refractive-index 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 oxides, hydroxides, composite salts (such as carbonates, nitrates, sulfates and the like) and boric acid and the like as raw materials, after being mixed by a conventional method, the mixed furnace materials are put into a smelting furnace (such as a platinum or platinum alloy crucible) with the temperature of 1200-1450 ℃ for smelting, 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 method and the process parameters according to the actual needs.
Glass preform and optical element
The glass preform can be produced from the produced high refractive index optical glass by direct gob casting, grinding, or press molding such as hot press molding. That is, a glass preform can be produced by directly precision-gob-molding a molten optical glass into a glass precision preform, by producing a glass preform by mechanical processing such as grinding and polishing, or by producing a preform for press molding from a high refractive index optical glass, by subjecting the preform to reheat press molding, and then to polishing processing. Note that the means for producing the glass preform is not limited to the above means.
As described above, the high refractive index 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 high refractive index optical glass of the present invention, and use the preform for reheat press molding, precision press molding, or the like to produce optical elements such as lenses and prisms.
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 Instrument ]
The optical element formed by the high-refractive-index 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 high refractive index 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, high refractive index optical glasses having compositions shown in tables 2 to 4 were obtained by the above 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 4.
Table 2.
Table 3.
Table 4.
< glass preform example >
Various 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 were produced by press molding the glasses obtained in examples 1 to 24# of the high refractive index optical glasses by means of, for example, polishing or hot press molding or precision press molding.
< optical element example >
The preforms obtained in the above examples of glass preforms 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 embodiment >
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. High-refractive-index optical glass characterized by comprising, in weight percent: siO 2 2 ：1～15％；B 2 O 3 ：5～25％；La 2 O 3 ：35～65％；Y 2 O 3 ：4～25％；ZrO 2 ：2～15％；Nb 2 O 5 :3 to 20% of (SiO) 2 +Y 2 O 3 )/B 2 O 3 Is 0.5 to 5.0.
2. The high refractive index optical glass according to claim 1, wherein the composition further comprises, in weight percent: gd (Gd) 2 O 3 :0 to 10 percent; and/or TiO 2 :0 to 10 percent; and/or Ta 2 O 5 :0 to 5 percent; and/or RO:0 to 8 percent; and/or Rn 2 O:0 to 8 percent; and/or WO 3 :0 to 5 percent; and/or ZnO:0 to 10 percent; and/or Al 2 O 3 :0 to 8 percent; and/or Yb 2 O 3 ：0～10％；And/or GeO 2 :0 to 5 percent; and/or a clarifying agent: 0 to 2 percent of RO, rn and one or more of MgO, caO, srO and BaO 2 O is Li 2 O、Na 2 O、K 2 One or more of O and Sb as clarifier 2 O 3 、SnO、SnO 2 、CeO 2 One or more of (a).
3. The high refractive index optical glass is characterized by containing SiO 2 、B 2 O 3 、La 2 O 3 、Y 2 O 3 、ZrO 2 And Nb 2 O 5 The components of which are expressed in weight percent, wherein (SiO) 2 +Y 2 O 3 )/B 2 O 3 0.5 to 5.0, the refractive index n of the optical glass d Is 1.87 to 1.94, abbe number v d 33 to 41 and the degree of air bubbles is above class A.
4. An optical glass according to claim 3, characterised in that its composition, expressed in weight percentage, comprises: siO 2 2 :1 to 15 percent; and/or B 2 O 3 :5 to 25 percent; and/or La 2 O 3 :35 to 65 percent; and/or Y 2 O 3 :4 to 25 percent; and/or ZrO 2 :2 to 15 percent; and/or Nb 2 O 5 :3 to 20 percent; and/or Gd 2 O 3 :0 to 10 percent; and/or TiO 2 :0 to 10 percent; and/or Ta 2 O 5 :0 to 5 percent; and/or RO:0 to 8 percent; and/or Rn 2 O:0 to 8 percent; and/or WO 3 :0 to 5 percent; and/or ZnO:0 to 10 percent; and/or Al 2 O 3 :0 to 8 percent; and/or Yb 2 O 3 :0 to 10 percent; and/or GeO 2 :0 to 5 percent; and/or a clarifying agent: 0 to 2 percent of RO, rn and one or more of MgO, caO, srO and BaO 2 O is Li 2 O、Na 2 O、K 2 One or more of O and Sb as clarifier 2 O 3 、SnO、SnO 2 、CeO 2 One or more of (a).
5. The high refractive index optical glass according to any one of claims 1 to 4, wherein the components are represented by weight percentage, wherein: 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 Is 55 to 70%, and La is more preferable 2 O 3 +Y 2 O 3 +Gd 2 O 3 60 to 70 percent; and/or (SiO) 2 +Y 2 O 3 )/B 2 O 3 0.7 to 3.0, preferably (SiO) 2 +Y 2 O 3 )/B 2 O 3 Is 1.0 to 2.5, more preferably (SiO) 2 +Y 2 O 3 )/B 2 O 3 1.0 to 2.0; and/or Y 2 O 3 /(SiO 2 +ZrO 2 ) 0.3 to 3.5, preferably Y 2 O 3 /(SiO 2 +ZrO 2 ) Is 0.4 to 3.0, more preferably Y 2 O 3 /(SiO 2 +ZrO 2 ) Is 0.5 to 2.5, and Y is more preferably 2 O 3 /(SiO 2 +ZrO 2 ) 0.5 to 2.0; and/or (Y) 2 O 3 +Nb 2 O 5 )/La 2 O 3 Is 0.2 to 1.0, preferably (Y) 2 O 3 +Nb 2 O 5 )/La 2 O 3 Is 0.25 to 0.8, more preferably (Y) 2 O 3 +Nb 2 O 5 )/La 2 O 3 Is 0.3 to 0.7, more preferably (Y) 2 O 3 +Nb 2 O 5 )/La 2 O 3 0.35 to 0.65; and/or Nb 2 O 5 /B 2 O 3 0.2 to 2.5, preferably Nb 2 O 5 /B 2 O 3 Is 0.4 to 2.0, more preferably Nb 2 O 5 /B 2 O 3 Is 0.5 to 1.8, and Nb is more preferable 2 O 5 /B 2 O 3 0.6 to 1.5.
6. According to claim 14-the high refractive index optical glass is characterized in that the components are expressed by weight percentage, wherein: tiO 2 2 /(Y 2 O 3 +Nb 2 O 5 ) Is 1.0 or less, preferably TiO 2 /(Y 2 O 3 +Nb 2 O 5 ) Is 0.8 or less, and TiO is more preferable 2 /(Y 2 O 3 +Nb 2 O 5 ) Is 0.5 or less, and TiO is more preferable 2 /(Y 2 O 3 +Nb 2 O 5 ) Is 0.3 or less; and/or (RO + Rn) 2 O)/SiO 2 Is 1.5 or less, preferably (RO + Rn) 2 O)/SiO 2 Is 1.0 or less, more preferably (RO + Rn) 2 O)/SiO 2 Is 0.8 or less, more preferably (RO + Rn) 2 O)/SiO 2 Is 0.5 or less; and/or ZnO/Y 2 O 3 Is 1.0 or less, preferably ZnO/Y 2 O 3 Is 0.8 or less, and ZnO/Y is more preferable 2 O 3 Is 0.5 or less, and ZnO/Y is more preferable 2 O 3 Is 0.2 or less; and/or (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 2.0 or less, preferably (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 1.5 or less, more preferably (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 Is 1.0 or less, more preferably (Ta) 2 O 5 +Gd 2 O 3 )/Nb 2 O 5 The RO is one or more of MgO, caO, srO and BaO, rn is less than or equal to 0.8 2 O is Li 2 O、Na 2 O、K 2 One or more of O.
7. A high refractive index optical glass according to any one of claims 1 to 4, wherein the composition is expressed in weight percentage, wherein: siO 2 2 :2 to 12%, preferably SiO 2 :4 to 10 percent; and/or B 2 O 3 :7 to 20%, preferably B 2 O 3 :9 to 16 percent; and/or La 2 O 3 :40 to 60%, preferably La 2 O 3 :42 to 55 percent; and/or Y 2 O 3 ：6～22%, preferably Y 2 O 3 :8 to 20%, more preferably Y 2 O 3 :11 to 20 percent; and/or Gd 2 O 3 :0 to 7%, preferably Gd 2 O 3 :0 to 5 percent; and/or ZrO 2 :3 to 12%, preferably ZrO 2 :4 to 10 percent; and/or Nb 2 O 5 :5 to 15%, preferably Nb 2 O 5 :7 to 11 percent; and/or Ta 2 O 5 :0 to 3%, preferably Ta 2 O 5 :0 to 1 percent; and/or TiO 2 :0 to 8%, preferably TiO 2 :0 to 5 percent; and/or RO:0 to 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 5%, 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 a clarifying agent: 0 to 1%, preferably a clarifying agent: 0 to 0.5 percent of the total weight of the catalyst, wherein the RO is one or more of MgO, caO, srO and BaO, and Rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O and Sb as clarifier 2 O 3 、SnO、SnO 2 、CeO 2 One or more of (a).
8. The high refractive index optical glass according to any one of claims 1 to 4, wherein WO is not contained in the composition 3 (ii) a And/or does not contain Ta 2 O 5 (ii) a And/or does not contain RO; and/or does not contain Rn 2 O; and/or no ZnO; and/or does not contain Al 2 O 3 (ii) a And/or does not contain GeO 2 The RO is one or more of MgO, caO, srO and BaO, and Rn 2 O is Li 2 O、Na 2 O、K 2 One or more of O.
9. The high refractive index optical glass according to any one of claims 1 to 4The glass is characterized in that the refractive index n of the high-refractive-index optical glass d Is 1.87 to 1.94, preferably 1.88 to 1.92, more preferably 1.89 to 1.91, abbe number v d 33 to 41, preferably 35 to 40, more preferably 36 to 39.
10. The high refractive index optical glass according to any one of claims 1 to 4, wherein the high refractive index optical glass has a thermal expansion coefficient α 20/120℃ Is 95X 10 -7 Preferably 90X 10 or less,/K -7 A value of 80X 10 or less in terms of/K or less -7 below/K; and/or stability against water action D W Is 2 or more, preferably 1; and/or lambda 70 Is 410nm or less, preferably λ 70 Is 400nm or less, more preferably lambda 70 Is below 395 nm; and/or lambda 5 Is 370nm or less, preferably λ 5 Is 360nm or less, more preferably λ 5 Is below 355 nm; and/or the weather resistance CR is of class 2 or more, preferably of class 1; and/or Knoop hardness H K Is 670X 10 7 Pa or more, preferably 680X 10 7 Pa or more, more preferably 690X 10 7 Pa is above; and/or a Young's modulus E of 10000X 10 7 Pa～14000×10 7 Pa, preferably 11000X 10 7 Pa～13500×10 7 Pa, more preferably 11500X 10 7 Pa～13000×10 7 Pa; and/or the degree of bubbling is class A or more, preferably class A 0 More preferably A or more 00 And (4) stages.
11. A glass preform characterized by being made of the high refractive index optical glass according to any one of claims 1 to 10.
12. An optical element produced from the high refractive index 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 high refractive index optical glass according to any one of claims 1 to 10 and/or comprising the optical element according to claim 12.
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