CN115321815A - High-refraction high-dispersion optical glass - Google Patents
High-refraction high-dispersion optical glass Download PDFInfo
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- CN115321815A CN115321815A CN202211031626.XA CN202211031626A CN115321815A CN 115321815 A CN115321815 A CN 115321815A CN 202211031626 A CN202211031626 A CN 202211031626A CN 115321815 A CN115321815 A CN 115321815A
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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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- 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
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
- C03C1/004—Refining agents
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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
- C03C4/00—Compositions for glass with special properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
Abstract
The invention provides high-refraction high-dispersion optical glass, which comprises the following components in percentage by weight: siO 2 2 +B 2 O 3 ：5～30％；La 2 O 3 +Y 2 O 3 +Gd 2 O 3 ：45～75％；ZrO 2 ：2～15％；Nb 2 O 5 ：1～15％；TiO 2 :5 to 20% of (SiO) 2 +B 2 O 3 )/Y 2 O 3 Is 0.2 to 3.5. Through reasonable component design, the optical glass obtained by the invention has excellent bubble degree and lower thermal expansion coefficient while having the expected refractive index and Abbe number.
Description
Technical Field
The invention relates to optical glass, in particular to high-refraction and high-dispersion optical glass.
Background
In recent years, with the spread of digital cameras, surveillance and security, on-vehicle imaging, and the like, demands for optical elements mounted on these devices have been increasing, and high-refractive high-dispersive optical glass is an optical material that can be widely used in these devices. An optical element mounted in an optical instrument for vehicle mounting and an optical element mounted in an optical instrument generating heat such as a projector, a copying machine, a laser printer and the like are used in an environment where a temperature change is large, and if the thermal expansion coefficient of the optical glass is too large, thermal expansion of the optical element occurs due to a change in the environmental temperature. Because of the difference of the expansion coefficient with the optical element fixing clamp, stress is generated in the optical element, and then birefringence is generated, so that the imaging characteristic is changed. Therefore, it is desirable that the optical glass has a low thermal expansion coefficient. On the other hand, optical glass must have excellent internal quality (striae, bubbles, inclusions, etc.) in addition to desired optical properties, and if the composition design of the optical glass is not reasonable, a large number of bubbles are likely to be present in the glass, resulting in the rejection of the glass.
Disclosure of Invention
The technical problem to be solved by the invention is to provide high-refraction high-dispersion optical glass with excellent bubble degree and lower thermal expansion coefficient.
The technical scheme adopted by the invention for solving the technical problem is as follows:
(1) High-refractive high-dispersive optical glass, the composition of which is expressed by weight percentage and comprises: siO 2 2 +B 2 O 3 ：5～30％；La 2 O 3 +Y 2 O 3 +Gd 2 O 3 ：45～75％；ZrO 2 ：2～15％；Nb 2 O 5 ：1～15％；TiO 2 :5 to 20 percent of (SiO) 2 +B 2 O 3 )/Y 2 O 3 Is 0.2 to 3.5.
(2) The high-refractive-index and high-dispersion optical glass according to (1), which comprises the following components in percentage by weight: ta 2 O 5 :0 to 5 percent; and/or RO:0 to 10 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 and high dispersive optical glass containing ZrO 2 、Nb 2 O 5 、TiO 2 The components of the material are expressed by weight percentage and contain 5 to 30 percent of SiO 2 +B 2 O 3 And 45 to 75% of La 2 O 3 +Y 2 O 3 +Gd 2 O 3 Wherein (SiO) 2 +B 2 O 3 )/Y 2 O 3 0.2 to 3.5, the refractive index of the high-refractive-index high-dispersion optical glass is more than 1.97, the Abbe number is 25 to 34, and the thermal expansion coefficient alpha is -30/70℃ Is 85X 10 -7 A bubble degree of A or more is not more than class K.
(4) The high-refractive-index, high-dispersion optical glass according to (3), which comprises the following components in percentage by weight: zrO (zirconium oxide) 2 :2 to 15 percent; and/or Nb 2 O 5 :1 to 15 percent; and/or TiO 2 :5 to 20 percent; and/or Ta 2 O 5 :0 to 5 percent; and/or RO:0 to 10 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, high-dispersion optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight and satisfies one or more of 8 cases:
1)(La 2 O 3 +TiO 2 )/Nb 2 O 5 is 3.0 to 30.0, preferably (La) 2 O 3 +TiO 2 )/Nb 2 O 5 Is 4.0 to 25.0, more preferably (La) 2 O 3 +TiO 2 )/Nb 2 O 5 Is 5.0 to 20.0, more preferably (La) 2 O 3 +TiO 2 )/Nb 2 O 5 5.5 to 15.0;
2)Nb 2 O 5 /Y 2 O 3 0.1 to 2.0, preferably Nb 2 O 5 /Y 2 O 3 Is 0.2 to 1.5, more preferably Nb 2 O 5 /Y 2 O 3 0.3 to 1.3, more preferablySelecting Nb 2 O 5 /Y 2 O 3 0.3 to 1.0;
3)Y 2 O 3 /TiO 2 0.3 to 3.0, preferably Y 2 O 3 /TiO 2 Is 0.4 to 2.0, more preferably Y 2 O 3 /TiO 2 Is 0.5 to 1.5, and Y is more preferably 2 O 3 /TiO 2 0.7 to 1.3;
4)(SiO 2 +B 2 O 3 )/Y 2 O 3 0.4 to 3.0, preferably (SiO) 2 +B 2 O 3 )/Y 2 O 3 Is 0.5 to 2.5, more preferably (SiO) 2 +B 2 O 3 )/Y 2 O 3 0.7 to 1.8;
5)(Nb 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 0.1 to 3.0, preferably (Nb) 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 Is 0.2 to 2.5, more preferably (Nb) 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 Is 0.3 to 2.0, more preferably (Nb) 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 0.4 to 1.5;
6)(RO+ZnO)/Y 2 O 3 is 1.0 or less, preferably (RO + ZnO)/Y 2 O 3 Is 0.8 or less, more preferably (RO + ZnO)/Y 2 O 3 Is 0.5 or less, and (RO + ZnO)/Y is more preferable 2 O 3 Is 0.2 or less;
7)(RO+Gd 2 O 3 )/Y 2 O 3 is 1.0 or less, preferably (RO + Gd) 2 O 3 )/Y 2 O 3 Is 0.8 or less, more preferably (RO + Gd) 2 O 3 )/Y 2 O 3 Is 0.6 or less, and more preferably (RO + Gd) 2 O 3 )/Y 2 O 3 Is 0.3 or less;
8)(WO 3 +TiO 2 )/Y 2 O 3 from 0.3 to 3.0, preferably (WO) 3 +TiO 2 )/Y 2 O 3 Is 0.4 to 2.5, more preferably (WO) 3 +TiO 2 )/Y 2 O 3 Is 0.5 to 2.0, and is more preferably (WO) 3 +TiO 2 )/Y 2 O 3 Is in the range of 0.7 to 1.5,
the RO is one or more of MgO, caO, srO and BaO.
(6) The high-refractive-index, high-dispersion optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: siO 2 2 +B 2 O 3 :8 to 25%, preferably SiO 2 +B 2 O 3 :10 to 20 percent; and/or 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 percent; and/or ZrO 2 :3 to 12%, preferably ZrO 2 :4 to 10 percent; and/or Nb 2 O 5 :3 to 12%, preferably Nb 2 O 5 :5 to 10 percent; and/or Ta 2 O 5 :0 to 3%, preferably Ta 2 O 5 :0 to 1 percent; and/or TiO 2 :6 to 18%, preferably TiO 2 :8 to 15 percent; and/or RO:0 to 5%, 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 2 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).
(7) The high-refractive-index, high-dispersion optical glass according to any one of (1) to (4), which comprises, in terms of weight percent: siO 2 2 :1 to 15%, preferably SiO 2 :2 to 10%, more preferably SiO 2 :4 to 9 percent; and/or B 2 O 3 :2 to 18%, preferably B 2 O 3 :4 to 12%, more preferably B 2 O 3 :5 to 10 percent; and/or La 2 O 3 :35 to 65%, preferably La 2 O 3 :40 to 60%, more preferably La 2 O 3 :42 to 55 percent; and/or Y 2 O 3 :5 to 25%, preferably Y 2 O 3 :6 to 20%, more preferably Y 2 O 3 :8 to 18%, more preferably Y 2 O 3 :8 to 15 percent; and/or Gd 2 O 3 :0 to 10%, preferably Gd 2 O 3 :0 to 6%, more preferably Gd 2 O 3 ：0～4％。
(8) The high-refractive-index, high-dispersion optical glass according to any one of (1) to (4), which does not contain Ta in its composition 2 O 5 (ii) a And/or does not contain WO 3 (ii) a And/or does not contain Yb 2 O 3 (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, high-dispersion optical glass according to any one of (1) to (4), wherein the refractive index n of the high-refractive-index, high-dispersion optical glass d 1.97 or more, preferably 1.98 or more, more preferably 1.99 or more; abbe number v d Is 25 to 34, preferably 26 to 33, more preferably 27 to 32, and still more preferably 28 to 31.
(10) The high-refractive-index, high-dispersion optical glass according to any one of (1) to (4), wherein the density ρ of the high-refractive-index, high-dispersion optical glass is 5.20g/cm 3 Below, preferably 5.10g/cm 3 Hereinafter, more preferably 5.00g/cm 3 The following; and/or coefficient of thermal expansion alpha -30/70℃ Is 85X 10 -7 Preferably 80X 10 or less,/K -7 A value of less than or equal to K, more preferably 75X 10 -7 below/K; and/or stability against water action D W Is 2 or more, preferably 1; and/or stabilization against acid actionProperty D A Is 2 or more, preferably 1; and/or the weather resistance CR is of class 2 or more, preferably of class 1; and/or Knoop hardness H 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; and/or a Young's modulus E of 11500X 10 7 Pa～15500×10 7 Pa, preferably 12000X 10 7 Pa～15000×10 7 Pa, more preferably 12500X 10 7 Pa～14500×10 7 Pa, further preferably 13000X 10 7 Pa～14000×10 7 Pa; and/or the degree of bubbling is class A or higher, preferably class A 0 More preferably A or more 00 Stage (2); and/or degree of wear F A Is 80 to 125, preferably 85 to 115, more preferably 90 to 105.
(11) A glass preform made of the high-refractive-index, high-dispersive optical glass according to any one of (1) to (10).
(12) An optical element produced from the high-refractive-index, high-dispersion 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 high-dispersion optical glass according to any one of (1) to (10) and/or the optical element according to (12).
The invention has the beneficial effects that: through reasonable component design, the optical glass obtained by the invention has excellent bubble degree and lower thermal expansion coefficient while having the expected refractive index and Abbe number.
Detailed Description
The present invention is not limited to the embodiments described below, and can be carried out with appropriate modifications within the scope of the object of the present invention. In addition, although the description of the overlapping portions may be appropriately omitted, the gist of the present invention is not limited thereto, and in the following description, the high-refractive high-dispersive optical glass of the present invention may be simply referred to as optical glass or glass.
[ high refractive index and high dispersive optical glass ]
The ranges of the respective components (ingredients) of the high-refractive high-dispersive optical glass of the present invention are described 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 >
B 2 O 3 Is a component for forming glass network, and has the functions of raising glass meltability and devitrification resistance and reducing glass transition temperature and density, and the invention contains more than 2% of B 2 O 3 In order to obtain the above effects, it is preferable to contain 4% or more of B 2 O 3 More preferably 5% or more of B 2 O 3 (ii) a However, if the content exceeds 18%, the glass is deteriorated in stability and the refractive index is lowered, and it is difficult to obtain the high refractive index of the present invention. Thus, in the present invention B 2 O 3 The upper limit of the content of (B) is 18%, preferably 12%, more preferably 10%.
SiO 2 The glass is also a network forming component, can adjust the thermal expansion coefficient of the glass, improves the devitrification resistance and the chemical stability of the glass, and also has the function of improving the thermal stability and the high-temperature viscosity of the glass; if the content exceeds 15%, the melting property of the glass tends to deteriorate and the transition temperature rises. Thus, siO in the present invention 2 The content of (B) is 1 to 15%, preferably 2 to 10%, more preferably 4 to 9%。
In some embodiments, the SiO is formed by mixing SiO 2 And B 2 O 3 SiO in total content 2 +B 2 O 3 The content of the glass transition metal is controlled within the range of 5-30%, so that the abrasion degree and weather resistance of the glass can be optimized while the glass forming stability of the glass is maintained, and the devitrification resistance of the glass is prevented from being reduced. Therefore, siO is preferable 2 +B 2 O 3 5 to 30%, more preferably SiO 2 +B 2 O 3 8 to 25%, and SiO is more preferable 2 +B 2 O 3 10 to 20 percent.
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%, devitrification tendency of the glass is rather increased and 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 5 percent of Y 2 O 3 To obtain the above-mentioned effect; 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 is 5 to 25%, preferably 6 to 20%, more preferably 8 to 18%, and still more preferably 8 to 15%.
In some embodiments, the SiO is 2 And B 2 O 3 SiO (total content) 2 +B 2 O 3 And Y 2 O 3 Ratio between contents of (SiO) 2 +B 2 O 3 )/Y 2 O 3 The control range is 0.2-3.5, which is beneficial to improving the bubble degree of the glass and preventing the thermal expansion coefficient of the glass from increasing. Therefore, (SiO) is preferable 2 +B 2 O 3 )/Y 2 O 3 Is 0.2 to 3.5, more preferably (SiO) 2 +B 2 O 3 )/Y 2 O 3 0.4 to 3.0. Further, control (SiO) 2 +B 2 O 3 )/Y 2 O 3 In the range of 0.5 to 2.5, the hardness and weather resistance of the glass can be further improved. Therefore, (SiO) is more preferable 2 +B 2 O 3 )/Y 2 O 3 Is 0.5 to 2.5, and (SiO) is more preferable 2 +B 2 O 3 )/Y 2 O 3 0.7 to 1.8.
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 6%, more preferably 0 to 4%.
In some embodiments, by passing La 2 O 3 、Y 2 O 3 And Gd 2 O 3 The 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 Is 55 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 8%, 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 2%, 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 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 In an amount of2 to 15%, preferably 3 to 12%, more preferably 4 to 10%.
TiO 2 Is a high-refraction high-dispersion component, can obviously improve the refractive index and dispersion of glass in the glass, and the inventor researches and discovers that a proper amount of TiO is contained 2 The glass stability can be increased; but if too much TiO content is contained 2 The transmittance of the glass is significantly reduced, and the chemical stability of the glass tends to be deteriorated. Thus, tiO in the present invention 2 The content of (b) is 5 to 20%, preferably 6 to 18%, more preferably 8 to 15%.
In some embodiments, by reacting Y 2 O 3 In relation to TiO 2 Ratio Y between contents of 2 O 3 /TiO 2 The control is within the range of 0.3-3.0, the weather resistance of the glass can be improved, and the abrasion degree is optimized. Therefore, Y is preferred 2 O 3 /TiO 2 Is 0.3 to 3.0, more preferably Y 2 O 3 /TiO 2 0.4 to 2.0. Further, control Y 2 O 3 /TiO 2 Within the range of 0.5 to 1.5, the chemical stability and the bubble degree of the glass can be further improved. Therefore, Y is more preferable 2 O 3 /TiO 2 Is 0.5 to 1.5, and Y is more preferably 2 O 3 /TiO 2 0.7 to 1.3.
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 1 percent of Nb 2 O 5 To obtain the above effects, nb is preferable 2 O 5 The lower limit of (B) is 3%, and the more preferable lower limit is 5%. If Nb 2 O 5 More than 15%, the glass is lowered in thermal stability and weather resistance and the light transmittance is lowered, so that Nb in the present invention is contained 2 O 5 The upper limit of the content of (b) is 15%, preferably 12%, more preferably 10%.
In some embodiments, by passing La 2 O 3 And TiO 2 The total content La of 2 O 3 +TiO 2 And Nb 2 O 5 Ratio between contents of (La) 2 O 3 +TiO 2 )/Nb 2 O 5 The chemical stability of the glass can be improved and the abrasion degree of the glass can be optimized by controlling the range of 3.0-30.0. Therefore, (La) is preferable 2 O 3 +TiO 2 )/Nb 2 O 5 Is 3.0 to 30.0, more preferably (La) 2 O 3 +TiO 2 )/Nb 2 O 5 Is 4.0 to 25.0. Further, control (La) 2 O 3 +TiO 2 )/Nb 2 O 5 In the range of 5.0 to 20.0, the thermal expansion coefficient of the glass can be further reduced and the hardness of the glass can be improved. Therefore, (La) is more preferable 2 O 3 +TiO 2 )/Nb 2 O 5 Is 5.0 to 20.0, more preferably (La) 2 O 3 +TiO 2 )/Nb 2 O 5 5.5 to 15.0.
In some embodiments, nb is 2 O 5 Content of (2) and Y 2 O 3 Ratio Nb between contents of 2 O 5 /Y 2 O 3 By controlling the value within the range of 0.1 to 2.0, the Young's modulus of the glass can be improved and the hardness of the glass can be prevented from lowering. Therefore, nb is preferable 2 O 5 /Y 2 O 3 Is 0.1 to 2.0, more preferably Nb 2 O 5 /Y 2 O 3 0.2 to 1.5. Further, controlling Nb 2 O 5 /Y 2 O 3 In the range of 0.3 to 1.3, the bubble degree and abrasion degree of the glass can be further optimized. Therefore, nb is more preferable 2 O 5 /Y 2 O 3 0.3 to 1.3, more preferably Nb 2 O 5 /Y 2 O 3 0.3 to 1.0.
Alkaline earth metal oxide RO (RO is one or more of MgO, caO, srO, and BaO) can adjust optical constants of the glass and optimize chemical stability of the glass, but when the content is high, devitrification resistance of the glass is lowered. Therefore, the RO content is limited to 0 to 10%, preferably 0 to 5%, and more preferably 0 to 2%. In some embodiments, it is further preferred that no RO is present.
In some embodiments, RO and Gd are administered 2 O 3 Total content RO of+Gd 2 O 3 And Y 2 O 3 Ratio between contents of (RO + Gd) 2 O 3 )/Y 2 O 3 The control is below 1.0, which is beneficial to reducing the density of the glass, improving the chemical stability of the glass and optimizing the Young modulus and the bubble degree of the glass. Therefore, (RO + Gd) is preferable 2 O 3 )/Y 2 O 3 Is 1.0 or less, more preferably (RO + Gd) 2 O 3 )/Y 2 O 3 Is 0.8 or less, more preferably (RO + Gd) 2 O 3 )/Y 2 O 3 Is 0.6 or less, more preferably (RO + Gd) 2 O 3 )/Y 2 O 3 Is 0.3 or less.
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。
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 that WO is absent 3 。
In some embodiments, nb is 2 O 5 、WO 3 、Gd 2 O 3 Total content of (2) Nb 2 O 5 +WO 3 +Gd 2 O 3 With TiO 2 Ratio between contents (Nb) 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 The light transmittance of the glass can be improved and the density can be prevented from increasing by controlling the concentration to be within the range of 0.1 to 3.0. Therefore, (Nb) is preferable 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 0.1 to 3.0, furtherPreferably (Nb) 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 0.2 to 2.5. Further, control (Nb) 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 In the range of 0.3 to 2.0, the thermal expansion coefficient of the glass can be further reduced, and the Young's modulus can be improved. Therefore, (Nb) is more preferable 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 Is 0.3 to 2.0, more preferably (Nb) 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 0.4 to 1.5.
In some embodiments, WO is 3 And TiO 2 2 WO in total 3 +TiO 2 And Y 2 O 3 Ratio between contents of (WO) 3 +TiO 2 )/Y 2 O 3 The control is in the range of 0.3-3.0, which is beneficial to improving the chemical stability of the glass and optimizing the abrasion degree and Young modulus. Therefore, preferred is (WO) 3 +TiO 2 )/Y 2 O 3 Is 0.3 to 3.0, more preferably (WO) 3 +TiO 2 )/Y 2 O 3 Is 0.4 to 2.5, and is more preferably (WO) 3 +TiO 2 )/Y 2 O 3 Is 0.5 to 2.0, more preferably (WO) 3 +TiO 2 )/Y 2 O 3 0.7 to 1.5.
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 difficulty of glass forming 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 combined content of RO and ZnO RO + ZnO and Y are combined 2 O 3 The ratio (RO + ZnO)/Y between the contents of (A) and (B) 2 O 3 By controlling the amount to 1.0 or less, the weather resistance of the glass can be improved, the degree of abrasion can be optimized, and the deterioration of the bubble degree and the thermal expansion coefficient of the glass can be prevented. Therefore, (RO + ZnO)/Y is preferable 2 O 3 Is 1.0 or less, more preferably (RO + ZnO)/Y 2 O 3 Is 0.8 or less, preferably(RO + ZnO)/Y is selected 2 O 3 Is 0.5 or less, more preferably (RO + ZnO)/Y 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 of the glass is too high, the thermal stability of the glass is reduced, and the density is increased; on the other hand, ta is compared with other components 2 O 5 The price of (2) is very expensive, and the amount of use should be minimized from the practical and cost viewpoints. Thus, ta in the 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 。
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 refractive index and devitrification resistance, 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 has clarifying propertiesThe Sb is preferred in the present invention because it has a reduced tendency to promote the corrosion of platinum or platinum alloy vessels for melting glass and the deterioration of molding dies due to its strong oxidizing action 2 O 3 The content of (A) 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 However, when the content exceeds 2%, the glass tends to be colored more, or when the glass is heated, softened, press-molded or the like and then reformed, sn becomes a starting point of crystal nucleus formation, and the glass tends to be devitrified. 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 discarded without taking special measures for environmental countermeasures.
To be environmentally friendly, the high-refractive high-dispersive optical glass of the invention preferably does not contain As 2 O 3 And PbO.
"0%" or "0%" is not included in the present invention, and means that the compound, molecule, element or the like is not intentionally added as a raw material to the high-refractive high-dispersive 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 high-dispersive 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 (v) d ) The test was carried out according to the method specified in GB/T7962.1-2010.
In some embodiments, the refractive index (n) of the high refractive high dispersive optical glass of the present invention d ) The lower limit of (b) is 1.97, preferably 1.98, more preferably 1.99.
In some embodiments, the refractive index (n) of the high refractive high dispersive optical glass of the present invention d ) The upper limit of (2) is 2.10, preferably the upper limit is 2.05, and more preferably the upper limit is 2.02.
In some embodiments, the high-refractive, high-dispersion optical glass of the invention has an Abbe number (v) d ) The lower limit of (b) is 25, preferably 26, more preferably 27, and still more preferably 28.
In some embodiments, the Abbe number (v) of the high refractive, high dispersive optical glass of the present invention d ) The upper limit of (2) is 34, preferably 33, more preferably 32, and still more preferably 31.
< Density >
The density (. Rho.) of the optical glass was measured according to the method specified in GB/T7962.20-2010.
In some embodiments, the invention provides a high foldThe density (. Rho.) of the high refractive index optical glass was 5.20g/cm 3 Below, preferably 5.10g/cm 3 Hereinafter, more preferably 5.00g/cm 3 The following.
< coefficient of thermal expansion >
Coefficient of thermal expansion (alpha) of optical glass -30/70℃ ) The data at-30 to 70 ℃ were tested according to the method specified in GB/T7962.16-2010.
In some embodiments, the high refractive high dispersive optical glass of the present invention has a coefficient of thermal expansion (α) -30/70℃ ) Is 85X 10 -7 A value of 80X 10 or less, preferably below/K -7 A value of not more than 75X 10 -7 and/K is less than or equal to.
< stability against Water action >
Stability to Water action of optical glasses (D) W ) (powder method) the test was carried out according to the method described in GB/T17129.
In some embodiments, the water stability (D) of the high refractive high dispersive optical glass of the present invention W ) Is 2 or more, preferably 1.
< stability against acid Effect >
Stability of acid resistance of optical glass (D) A ) (powder method) the test was carried out according to the method prescribed in GB/T17129.
In some embodiments, the high refractive high dispersive optical glass of the present invention has stability to acid action (D) A ) Is 2 or more, preferably 1.
< 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 high-refractive high-dispersive optical glass of the present invention has a weatherability (CR) of 2 or more, preferably 1.
< 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 high-refractive, high-dispersive optical glass 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 measuring the longitudinal wave velocity and the transverse wave velocity of the Young modulus by ultrasonic waves and 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 low limit of the Young's modulus (E) of the high-refractive, high-dispersive optical glass of the invention is 11500X 10 7 Pa, preferably lower limit of 12000X 10 7 Pa, more preferably lower limit of 12500X 10 7 Pa, a further preferred lower limit is 13000X 10 7 Pa。
In some embodiments, the high-refractive high-dispersive optical glass of the invention has a Young's modulus (E) of 15500X 10 7 Pa, preferably upper limit of 15000X 10 7 Pa, more preferably upper limit14500×10 7 Pa, more preferably 14000X 10 7 Pa。
< degree of wear >
Degree of abrasion (F) of optical glass A ) The abrasion loss of the sample is multiplied by 100 under the same conditions, and the ratio is expressed as follows:
F A ＝V/V 0 ×100＝(W/ρ)/(W 0 /ρ 0 )×100
in the formula: v, the volume abrasion loss of the measured sample;
V 0 -the amount of wear of the standard sample volume;
w is the abrasion loss of the quality of the sample to be measured;
W 0 -abrasion loss of standard sample mass;
rho is the density of the sample to be measured;
ρ 0 -standard sample density.
In some embodiments, the high refractive high dispersive optical glass of the present invention has an abrasion (F) A ) The lower limit of (2) is 80, preferably 85, and more preferably 90.
In some embodiments, the high-refractive high-dispersive optical glass of the present invention has an abrasion loss (F) A ) The upper limit of (2) is 125, the upper limit is preferably 115, and the upper limit is more preferably 105.
< degree of bubbling >
The bubble degree of the optical glass was measured according to the method specified in GB/T7962.8-2010.
In some embodiments, the high-refractive high-dispersive optical glass of the invention has a bubble size of class A or above, preferably A 0 More preferably A or more 00 And (4) stage.
[ method for producing optical glass ]
The manufacturing method of the high-refraction high-dispersion 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 made from the high-refractive high-dispersive optical glass produced by direct gob-casting, grinding, or press molding such as hot press molding. That is, a glass preform can be produced by direct precision gob-molding of 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 optical glass, subjecting the preform to reheat press molding, and then performing polishing processing. It should be noted that the means for producing the glass preform is not limited to the above means.
As described above, the high-refractive-index, high-dispersion optical glass of the present invention is useful for various optical elements and optical designs, and among them, it is particularly preferable to form a preform from the optical glass of the present invention, and use the preform for reheat press molding, precision press molding, or 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 above-described high-refractive high-dispersive optical glass of the present invention. The glass prefabricated member has excellent characteristics of high-refraction and high-dispersion optical glass; the optical element of the present invention has excellent characteristics of high-refractive-index, high-dispersion optical glass, and can provide various optical elements such as lenses and prisms having high optical values.
Examples of the lens include various lenses such as a concave meniscus lens, a convex meniscus lens, a double convex lens, a double concave lens, a plano-convex lens, and a plano-concave lens, each of which has a spherical or aspherical lens surface.
[ optical instruments ]
The optical element formed by the high-refraction high-dispersion optical glass can be used for manufacturing optical instruments such as photographic equipment, camera equipment, projection equipment, display equipment, vehicle-mounted equipment, monitoring equipment and the like.
Examples
< high refractive index high dispersive optical glass example >
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 and high-dispersive optical glasses having compositions shown in tables 2 to 4 were obtained by the above-described 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 a concave meniscus lens, a convex meniscus lens, a biconvex lens, a biconcave lens, a plano-convex lens and a plano-concave lens, and a preform such as a prism were produced by using the glasses obtained in examples 1 to 24# of the high-refractive high-dispersive optical glass by means of polishing or press molding such as reheat press molding and precision press molding.
< optical element example >
The preforms obtained from the above glass preform examples were annealed to reduce the internal stress of the glass and to fine-tune the refractive index so that the optical properties such as refractive index reached the desired values.
Next, each preform is ground and polished to produce various lenses such as a concave meniscus lens, a convex meniscus lens, a biconvex lens, a biconcave lens, a plano-convex lens, and a plano-concave lens, and a prism. The surface of the resulting optical element may be coated with an antireflection film.
< optical Instrument example >
The optical element produced by the above-described optical element embodiments can be used, for example, for imaging devices, sensors, microscopes, medical technology, digital projection, communication, optical communication technology/information transmission, optics/illumination in the automotive field, lithography, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips, by optical design, by forming an optical component or optical assembly using one or more optical elements.
Claims (13)
1. High-refractive-index, high-dispersion optical glass, characterized in that its composition, expressed in weight percentages, comprises: siO 2 2 +B 2 O 3 ：5～30％；La 2 O 3 +Y 2 O 3 +Gd 2 O 3 ：45～75％；ZrO 2 ：2～15％；Nb 2 O 5 ：1～15％；TiO 2 :5 to 20% of (SiO) 2 +B 2 O 3 )/Y 2 O 3 0.2 to 3.5.
2. A high-refractive-index, high-dispersive optical glass according to claim 1, characterized in that it further comprises, in percentages by weight: ta 2 O 5 :0 to 5 percent; and/or RO:0 to 10 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 high-dispersion optical glass characterized by containing ZrO 2 、Nb 2 O 5 、TiO 2 The components of the material are expressed by weight percentage and contain 5 to 30 percent of SiO 2 +B 2 O 3 And 45 to 75% of La 2 O 3 +Y 2 O 3 +Gd 2 O 3 Wherein (SiO) 2 +B 2 O 3 )/Y 2 O 3 0.2 to 3.5, the high-refractive index and high-dispersion optical glass has a refractive index of 1.97 or more, an Abbe number of 25 to 34, and a thermal expansion coefficient alpha -30/70℃ Is 85X 10 -7 A degree of bubbling of A or more and a value of K or less.
4. A high-refractive-index, high-dispersive optical glass according to claim 3, characterized in that its composition, expressed in weight percentages, comprises: zrO (ZrO) 2 :2 to 15 percent; and/or Nb 2 O 5 :1 to 15 percent; and/or TiO 2 :5 to 20 percent; and/or Ta 2 O 5 :0 to 5 percent; and/or RO:0 to 10 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. A high-refractive-index, high-dispersion optical glass according to any one of claims 1 to 4, whose composition, expressed in weight percentage, satisfies one or more of the following 8 conditions:
1)(La 2 O 3 +TiO 2 )/Nb 2 O 5 is 3.0 to 30.0, preferably (La) 2 O 3 +TiO 2 )/Nb 2 O 5 Is 4.0 to 25.0, more preferably (La) 2 O 3 +TiO 2 )/Nb 2 O 5 Is 5.0 to 20.0, and (La) is more preferable 2 O 3 +TiO 2 )/Nb 2 O 5 5.5 to 15.0;
2)Nb 2 O 5 /Y 2 O 3 0.1 to 2.0, preferably Nb 2 O 5 /Y 2 O 3 Is 0.2 to 1.5, more preferably Nb 2 O 5 /Y 2 O 3 Is 0.3 to 1.3, and Nb is more preferable 2 O 5 /Y 2 O 3 0.3 to 1.0;
3)Y 2 O 3 /TiO 2 0.3 to 3.0, preferably Y 2 O 3 /TiO 2 Is 0.4 to 2.0, more preferably Y 2 O 3 /TiO 2 Is 0.5 to 1.5, and Y is more preferably 2 O 3 /TiO 2 0.7 to 1.3;
4)(SiO 2 +B 2 O 3 )/Y 2 O 3 0.4 to 3.0, preferably (SiO) 2 +B 2 O 3 )/Y 2 O 3 Is 0.5 to 2.5, more preferably (SiO) 2 +B 2 O 3 )/Y 2 O 3 0.7 to 1.8;
5)(Nb 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 0.1 to 3.0, preferably (Nb) 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 Is 0.2 to 2.5, more preferably (Nb) 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 Is 0.3 to 2.0, and (Nb) is more preferable 2 O 5 +WO 3 +Gd 2 O 3 )/TiO 2 0.4 to 1.5;
6)(RO+ZnO)/Y 2 O 3 is 1.0 or less, preferably (RO + ZnO)/Y 2 O 3 Is 0.8 or less, more preferably (RO + ZnO)/Y 2 O 3 Is 0.5 or less, and (RO + ZnO)/Y is more preferable 2 O 3 Is 0.2 or less;
7)(RO+Gd 2 O 3 )/Y 2 O 3 is 1.0 or less, preferably (RO + Gd) 2 O 3 )/Y 2 O 3 Is 0.8 or less, more preferably (RO + Gd) 2 O 3 )/Y 2 O 3 Is 0.6 or less, and more preferably (RO + Gd) 2 O 3 )/Y 2 O 3 Is 0.3 or less;
8)(WO 3 +TiO 2 )/Y 2 O 3 from 0.3 to 3.0, preferably (WO) 3 +TiO 2 )/Y 2 O 3 Is 0.4 to 2.5, more preferably (WO) 3 +TiO 2 )/Y 2 O 3 Is 0.5 to 2.0, and is more preferably (WO) 3 +TiO 2 )/Y 2 O 3 Is 0.7 to 1.5 percent,
the RO is one or more of MgO, caO, srO and BaO.
6. A high-refractive-index, high-dispersive optical glass according to any one of claims 1 to 4, characterised in that its components are expressed in weight percentages in which: siO 2 2 +B 2 O 3 :8 to 25%, preferably SiO 2 +B 2 O 3 :10 to 20 percent; and/or La 2 O 3 +Y 2 O 3 +Gd 2 O 3 ：50～75%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 :55 to 70 percent; and/or ZrO 2 :3 to 12%, preferably ZrO 2 :4 to 10 percent; and/or Nb 2 O 5 :3 to 12%, preferably Nb 2 O 5 :5 to 10 percent; and/or Ta 2 O 5 :0 to 3%, preferably Ta 2 O 5 :0 to 1 percent; and/or TiO 2 :6 to 18%, preferably TiO 2 :8 to 15 percent; and/or RO:0 to 5%, 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 2 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).
7. A high-refractive-index, high-dispersive optical glass according to any one of claims 1 to 4, characterised in that its components are expressed in weight percentages in which: siO 2 2 :1 to 15%, preferably SiO 2 :2 to 10%, more preferably SiO 2 :4 to 9 percent; and/or B 2 O 3 :2 to 18%, preferably B 2 O 3 :4 to 12%, more preferably B 2 O 3 :5 to 10 percent; and/or La 2 O 3 :35 to 65%, preferably La 2 O 3 :40 to 60%, more preferably La 2 O 3 :42 to 55 percent; and/or Y 2 O 3 :5 to 25%, preferably Y 2 O 3 :6 to 20%, more preferably Y 2 O 3 :8 to 18%, and Y is more preferably 2 O 3 :8 to 15 percent; and/or Gd 2 O 3 :0 to 10%, preferably Gd 2 O 3 :0 to 6%, more preferably Gd 2 O 3 ：0～4％。
8. A high-refractive-index, high-dispersive optical glass according to any one of claims 1 to 4, characterised in that it does not contain Ta 2 O 5 (ii) a And/or does not contain WO 3 (ii) a And/or does not contain Yb 2 O 3 (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. A high-refractive-index, high-dispersion optical glass according to any one of claims 1 to 4, wherein the high-refractive-index, high-dispersion optical glass has a refractive index n d 1.97 or more, preferably 1.98 or more, more preferably 1.99 or more; abbe number v d Is 25 to 34, preferably 26 to 33, more preferably 27 to 32, and still more preferably 28 to 31.
10. The high-refractive-index, high-dispersion optical glass according to any one of claims 1 to 4, wherein the density p of the high-refractive-index, high-dispersion optical glass is 5.20g/cm 3 Below, preferably 5.10g/cm 3 Hereinafter, more preferably 5.00g/cm 3 The following; and/or coefficient of thermal expansion alpha -30/70℃ Is 85X 10 -7 Preferably 80X 10 or less,/K -7 A value of less than or equal to K, more preferably 75X 10 -7 below/K; and/or stability against water action D W Is 2 or more, preferably 1; and/or stability against acid action D A Is 2 or more, preferably 1; and/or the weather resistance CR is of class 2 or more, preferably of class 1; and/or Knoop hardness H K Is 670 multiplied by 10 7 Pa or more, preferably 680X 10 7 Pa or more, more preferably 690X 10 7 Pa is above; and/or Young's modulusE is 11500X 10 7 Pa～15500×10 7 Pa, preferably 12000X 10 7 Pa～15000×10 7 Pa, more preferably 12500X 10 7 Pa～14500×10 7 Pa, more preferably 13000X 10 7 Pa～14000×10 7 Pa; and/or the degree of bubbling is class A or higher, preferably class A 0 More preferably A or more 00 A stage; and/or degree of wear F A Is 80 to 125, preferably 85 to 115, and more preferably 90 to 105.
11. A glass preform made of the high-refractive-index, high-dispersion optical glass according to any one of claims 1 to 10.
12. An optical element, characterized by being made of the high-refractive-index, high-dispersion optical glass of any one of claims 1 to 10, or the glass preform of claim 11.
13. An optical instrument comprising the high-refractive high-dispersion 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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