CN115504666A - Optical glass and optical element - Google Patents
Optical glass and optical element Download PDFInfo
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- CN115504666A CN115504666A CN202211037483.3A CN202211037483A CN115504666A CN 115504666 A CN115504666 A CN 115504666A CN 202211037483 A CN202211037483 A CN 202211037483A CN 115504666 A CN115504666 A CN 115504666A
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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
Abstract
The invention provides an optical glass, which comprises the following components in percentage by weight: siO 2 2 +B 2 O 3 ：8～28％；La 2 O 3 +Y 2 O 3 +Gd 2 O 3 ：46～70％；ZrO 2 ：1～12％；Nb 2 O 5 ：4～20％；TiO 2 :4 to 18 percent of La 2 O 3 /(TiO 2 +Nb 2 O 5 ) Is 1.2 to 6.0. Through reasonable component design, the optical glass has higher Young modulus and light transmittance while having higher refractive index.
Description
Technical Field
The present invention relates to an optical glass, and more particularly to an optical glass having a high young's modulus and light transmittance, and an optical element and an optical instrument made of the same.
Background
In recent years, digitalization of optical instruments and high definition of images and videos have been rapidly advanced. In particular, high definition of images and videos is prominent in optical instruments such as digital cameras, video cameras, and projectors. Meanwhile, in the optical systems included in these optical instruments, the number of optical elements such as lenses and prisms is reduced, thereby achieving weight reduction and size reduction. Under the same curvature radius, the higher the refractive index of the glass, the larger the obtained imaging field of view is, which is beneficial to reducing the number of optical elements in the optical instrument, and along with the development trend of miniaturization of the optical instrument, the demand trend of the high refractive index glass is more and more obvious. Optical glass with a high refractive index often contains a high content of components with a strong tinting strength, which generally results in low light transmittance of the optical glass and affects the imaging effect of an optical instrument. On the other hand, when an optical glass is processed into a small or thin optical element, if its young's modulus is small, it is easily deformed during use.
Disclosure of Invention
The invention aims to provide high-refractive-index optical glass with higher Young modulus and light transmittance.
The technical scheme adopted by the invention for solving the technical problem is as follows:
(1) The optical glass comprises the following components in percentage by weight: siO 2 2 +B 2 O 3 ：8～28％；La 2 O 3 +Y 2 O 3 +Gd 2 O 3 ：46～70％；ZrO 2 ：1～12％；Nb 2 O 5 ：4～20％；TiO 2 :4 to 18% of La 2 O 3 /(TiO 2 +Nb 2 O 5 ) Is 1.2 to 6.0.
(2) The optical glass according to (1), which comprises the following components in percentage by weight: ta 2 O 5 :0 to 8 percent; and/or RO:0 to 9 percent; and/or Rn 2 O:0 to 6 percent; and/or WO 3 :0 to 6 percent; and/or ZnO:0 to 8 percent; and/or Al 2 O 3 :0 to 5 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).
(3) Optical glass containing ZrO 2 、Nb 2 O 5 、TiO 2 The components of the material are expressed by weight percentage and contain 8 to 28 percent of SiO 2 +B 2 O 3 And 46 to 70% of La 2 O 3 +Y 2 O 3 +Gd 2 O 3 Wherein La 2 O 3 /(TiO 2 +Nb 2 O 5 ) 1.2 to 6.0, the refractive index n of the optical glass d Is 1.92 to 1.98, abbe number v d 29 to 36, and a Young's modulus E of 11000X 10 7 Pa～15000×10 7 Pa，λ 70 Has a wavelength of 425nm or less and a 5 Has a wavelength of 375nm or less.
(4) The optical glass according to (3)The glass comprises the following components in percentage by weight: zrO (zirconium oxide) 2 :1 to 12 percent; and/or Nb 2 O 5 :4 to 20 percent; and/or TiO 2 :4 to 18 percent; and/or Ta 2 O 5 :0 to 8 percent; and/or RO:0 to 9 percent; and/or Rn 2 O:0 to 6 percent; and/or WO 3 :0 to 6 percent; and/or ZnO:0 to 8 percent; and/or Al 2 O 3 :0 to 5 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 optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: la 2 O 3 /(TiO 2 +Nb 2 O 5 ) 1.5 to 5.0, preferably La 2 O 3 /(TiO 2 +Nb 2 O 5 ) Is 2.0 to 4.0, more preferably La 2 O 3 /(TiO 2 +Nb 2 O 5 ) 2.5 to 3.5; and/or TiO 2 /Y 2 O 3 0.3 to 4.0, preferably TiO 2 /Y 2 O 3 Is 0.5 to 3.0, more preferably TiO 2 /Y 2 O 3 Is in the range of 0.6 to 2.0, and TiO is more preferable 2 /Y 2 O 3 0.75 to 1.5; and/or Y 2 O 3 /B 2 O 3 0.4 to 3.0, preferably Y 2 O 3 /B 2 O 3 Is 0.5 to 2.5, more preferably Y 2 O 3 /B 2 O 3 Is 0.6 to 1.5, and Y is more preferably 2 O 3 /B 2 O 3 0.7 to 1.2; and/or (B) 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is 1.0 to 10.0, preferably (B) 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is 1.0 to 8.0, more preferably (B) 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is 1.5 to 7.0, and (B) is more preferable 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is 2.0 to 5.0.
(6) The optical glass according to any one of (1) to (4), which comprises, in terms of weight percent: (Ta) 2 O 5 +Gd 2 O 3 )/Y 2 O 3 Is 1.0 or less, preferably (Ta) 2 O 5 +Gd 2 O 3 )/Y 2 O 3 Is 0.6 or less, more preferably (Ta) 2 O 5 +Gd 2 O 3 )/Y 2 O 3 Is 0.4 or less, and (Ta) is more preferable 2 O 5 +Gd 2 O 3 )/Y 2 O 3 Is 0.1 or less; and/or TiO 2 /(Nb 2 O 5 +WO 3 ) 0.3 to 3.0, preferably TiO 2 /(Nb 2 O 5 +WO 3 ) 0.4 to 2.0, more preferably TiO 2 /(Nb 2 O 5 +WO 3 ) Is 0.6 to 1.5, and TiO is more preferable 2 /(Nb 2 O 5 +WO 3 ) 0.8 to 1.3; and/or ZnO/(SiO) 2 +B 2 O 3 ) Is 0.5 or less, and ZnO/(SiO) is preferred 2 +B 2 O 3 ) Is 0.3 or less, and ZnO/(SiO) is more preferable 2 +B 2 O 3 ) Is 0.2 or less, and ZnO/(SiO) is more preferable 2 +B 2 O 3 ) Is 0.1 or less; and/or (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 1.0 or less, preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.6 or less, more preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.3 or less, and (Gd) is more preferable 2 O 3 +ZnO)/Y 2 O 3 Is 0.1 or less; and/or WO 3 /Y 2 O 3 Is 0.8 or less, preferably WO 3 /Y 2 O 3 Is 0.6 or less, and WO is more preferable 3 /Y 2 O 3 0.02 to 0.5, and further preferably WO 3 /Y 2 O 3 0.05 to 0.3.
(7) The 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 ：50～68%, preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 :55 to 65 percent; and/or SiO 2 +B 2 O 3 :10 to 25%, preferably SiO 2 +B 2 O 3 :12 to 20 percent; and/or ZrO 2 :3 to 10%, preferably ZrO 2 :4 to 9 percent; and/or Nb 2 O 5 :5 to 15%, preferably Nb 2 O 5 :7 to 12 percent; and/or Ta 2 O 5 :0 to 4%, preferably Ta 2 O 5 :0 to 2 percent; and/or TiO 2 :5 to 13%, preferably TiO 2 :6 to 12 percent; and/or RO:0 to 4%, preferably RO:0 to 2 percent; and/or Rn 2 O:0 to 4%, preferably Rn 2 O:0 to 1 percent; and/or WO 3 :0 to 4%, preferably WO 3 :0.5 to 3 percent; and/or ZnO:0 to 4%, preferably ZnO:0 to 2 percent; and/or Al 2 O 3 :0 to 3%, preferably Al 2 O 3 :0 to 1 percent; and/or Yb 2 O 3 :0 to 5%, preferably Yb 2 O 3 :0 to 1 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 optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: siO 2 2 :1 to 12%, preferably SiO 2 :2 to 10%, more preferably SiO 2 :4 to 9 percent; and/or B 2 O 3 :5 to 18%, preferably B 2 O 3 :6 to 14%, more preferably B 2 O 3 :7 to 12 percent; and/or La 2 O 3 :40 to 60%, preferably La 2 O 3 :43 to 58%, more preferably La 2 O 3 :46 to 53 percent; and/or Y 2 O 3 :4 to 20%, preferably Y 2 O 3 :5 to 15%, more preferably Y 2 O 3 :6 to 12 percent; and/or Gd 2 O 3 :0 to 9%, preferably Gd 2 O 3 :0 to 5%, more preferably Gd 2 O 3 :0 to 3%, and Gd is more preferable 2 O 3 ：0～1％。
(9) The optical glass according to any one of (1) to (4), wherein Ta is not contained in the composition 2 O 5 (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.
(10) The optical glass according to any one of (1) to (4), wherein the refractive index n of the optical glass d Is 1.92 to 1.98, preferably 1.93 to 1.97, more preferably 1.94 to 1.96, abbe number v d Is 29 to 36, preferably 30 to 35, more preferably 31 to 34.
(11) The optical glass according to any one of (1) to (4), wherein the density ρ of the optical glass is 5.10g/cm 3 Below, preferably 5.00g/cm 3 Hereinafter, more preferably 4.95g/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 A value of 70X 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 stability against acid action D A Is 2 or more, preferably 1; and/or lambda 70 Is 425nm or less, preferably lambda 70 Is 420nm or less, more preferably lambda 70 415nm or less; and/or lambda 5 Is 375nm or less, preferably lambda 5 Is 370nm or less, more preferably λ 5 Is less than 365 nm; and/or the weather resistance CR is of class 2 or more, preferably of class 1; and/or Knoop hardness H K Is 650X 10 7 Pa or more, preferably 660X 10 7 Pa or more, more preferably 670X 10 7 Pa or more, and more preferably 680X 10 7 Pa or above; and/or a Young's modulus E of 11000×10 7 Pa～15000×10 7 Pa, preferably 11500X 10 7 Pa～14500×10 7 Pa, more preferably 12000X 10 7 Pa～14000×10 7 Pa, more preferably 12500X 10 7 Pa～13500×10 7 Pa; and/or the degree of bubbling is class A or more, preferably class A 0 More preferably A or more 00 Stage (2); and/or degree of wear F A Is 80 to 130, preferably 90 to 120, more preferably 95 to 115.
(12) A glass preform made of the optical glass according to any one of (1) to (11).
(13) An optical element produced from the optical glass according to any one of (1) to (11), or the glass preform according to (12).
(14) An optical device comprising the optical glass according to any one of (1) to (11) and/or the optical element according to (13).
The beneficial effects of the invention are: through reasonable component design, the optical glass has higher Young modulus and light transmittance while having higher refractive index.
Detailed Description
The optical glass of the present invention is obtained by the following steps, which are not intended to limit the scope of the present invention. Although the description of the overlapping portions may be omitted as appropriate, the gist of the present invention is not limited thereto, and the optical glass of the present invention may be simply referred to as glass in the following description.
[ optical glass ]
The ranges of the respective components (components) of the optical glass of the present invention are explained below. In the present invention, the contents and total contents of the respective components are all expressed in weight percent (wt%), that is, the contents and total contents of the respective components are expressed in weight percent with respect to the total amount of glass matter converted into the composition of oxides, if not specifically stated. Here, the "composition converted to oxides" means that when oxides, complex salts, hydroxides, and the like used as raw materials of the optical glass composition component of the present invention are decomposed and converted to oxides when melted, the total amount of the oxides is 100%.
Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. As used herein, "and/or" is inclusive, e.g., "A and/or B," and means A alone, B alone, or both A and B.
< essential Components and optional Components >
B 2 O 3 In the present invention, the network-forming component improves the thermal stability of the glass and improves the meltability of the glass, and the content of B in the glass composition is 5% or more 2 O 3 To obtain the above effects, B is preferred 2 O 3 The content of (B) is 6% or more, and B is more preferably 2 O 3 The content of (B) is 7% or more. When B is present 2 O 3 When the content of (b) is too large, the refractive index of the glass decreases, and the chemical stability deteriorates. Thus, in the present invention B 2 O 3 The upper limit of the content of (b) is 18%, preferably 14%, more preferably 12%.
SiO 2 Has the effects of improving the chemical stability of the glass, maintaining the viscosity suitable for the formation of the molten glass, and reducing the erosion of the refractory material, and if the content is too high, the difficulty of melting the glass is increased, and the reduction of the transition temperature of the glass is not favorable. Thus, siO in the present invention 2 The content of (b) is 1 to 12%, preferably 2 to 10%, more preferably 4 to 9%.
In some embodiments, by oxidizing SiO 2 And B 2 O 3 SiO in total content 2 +B 2 O 3 The content of the glass is controlled within the range of 8-28%, 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 8 to 28%, more preferably SiO 2 +B 2 O 3 10 to 25%, and SiO is more preferable 2 +B 2 O 3 Is 12 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 40 percent; if the content is more than 60%, 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 40 to 60%, preferably 43 to 58%, more preferably 46 to 53%.
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% of Y 2 O 3 To obtain the above-mentioned effect; if the content exceeds 20%, the chemical stability and weather resistance of the glass are deteriorated. Thus, Y in the present invention 2 O 3 The content is 4 to 20%, preferably 5 to 15%, more preferably 6 to 12%.
In some embodiments, Y is 2 O 3 Content of (A) and B 2 O 3 Ratio Y between contents of 2 O 3 /B 2 O 3 The control range of 0.4-3.0 is favorable for obtaining proper Young's modulus of the glass. Therefore, Y is preferred 2 O 3 /B 2 O 3 Is 0.4 to 3.0, more preferably Y 2 O 3 /B 2 O 3 0.5 to 2.5. Further, by adding Y 2 O 3 /B 2 O 3 The control is in the range of 0.6-1.5, which is beneficial to further reducing the thermal expansion coefficient of the glass and optimizing the bubble degree of the glass. Therefore, Y is more preferable 2 O 3 /B 2 O 3 Is 0.6 to 1.5, and Y is more preferably 2 O 3 /B 2 O 3 0.7 to 1.2.
Gd 2 O 3 The refractive index and chemical stability of the glass can be improved, but if the content is too high, the devitrification resistance and abrasion resistance of the glass are deteriorated, and the cost of the glass is increased. Thus, gd 2 O 3 The content of (b) is 0 to 9%, preferably 0 to 5%, more preferably 0 to 3%, and still more preferably 0 to 1%.
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 The control within the range of 46-70% makes it easier for the glass to obtain the desired refractive index and Abbe number, and optimizes the resistance to devitrification and weather resistance of the glass. Therefore, la is preferable 2 O 3 +Y 2 O 3 +Gd 2 O 3 46 to 70%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 50 to 68%, more preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 Is 55 to 65 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 1%, 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, difficulty in melting is increased, melting temperature is increased, and inclusions appear in the glass and light transmittance is lowered. Thus, zrO in the present invention 2 The content of (B) is 1 to 12%, preferably 3 to 10%, more preferably 4 to 9%.
TiO 2 The component is a high-refraction high-dispersion component, can obviously improve the refractive index and dispersion of glass in the glass, and is found by the research of the inventor that a proper amount of TiO is contained 2 The stability of the glass can be improved; 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 4 to 18%, preferably 5 to 13%, more preferably 6 to 12%.
In some embodiments, the TiO is 2 Content of (A) and Y 2 O 3 In a content ofM.o. ratio TiO 2 /Y 2 O 3 The abrasion degree and the weather resistance of the glass can be optimized by controlling the content of the glass to be within the range of 0.3-4.0. Therefore, tiO is preferred 2 /Y 2 O 3 Is 0.3 to 4.0, more preferably TiO 2 /Y 2 O 3 0.5 to 3.0. Further, control of TiO 2 /Y 2 O 3 In the range of 0.6 to 2.0, the chemical stability and the bubble degree of the glass can be further improved. Therefore, tiO is more preferable 2 /Y 2 O 3 0.6 to 2.0, and TiO is more preferable 2 /Y 2 O 3 0.75 to 1.5.
Nb 2 O 5 Is a high-refraction high-dispersion component, can improve the refractive index and devitrification resistance of the glass and reduce the thermal expansion coefficient of the glass, and the invention contains more than 4 percent of Nb 2 O 5 To obtain the above effects, nb is preferable 2 O 5 The lower limit of the content of (B) is 5%, and the more preferable lower limit is 7%. If Nb 2 O 5 More than 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 contained 2 O 5 The upper limit of the content of (b) is 20%, preferably 15%, more preferably 12%.
In some embodiments, la is 2 O 3 In relation to TiO 2 And Nb 2 O 5 Of the total content of La 2 O 3 /(TiO 2 +Nb 2 O 5 ) The Young modulus of the glass is controlled within the range of 1.2-6.0, so that the Young modulus of the glass is improved, and the light transmittance of the glass is prevented from being reduced. Therefore, la is preferable 2 O 3 /(TiO 2 +Nb 2 O 5 ) 1.2 to 6.0, more preferably La 2 O 3 /(TiO 2 +Nb 2 O 5 ) Is 1.5 to 5.0. Further, controlling La 2 O 3 /(TiO 2 +Nb 2 O 5 ) In the range of 2.0 to 4.0, the density and thermal expansion coefficient of the glass can be further reduced. Therefore, la is more preferable 2 O 3 /(TiO 2 +Nb 2 O 5 ) 2.0 to 4.0, more preferably La 2 O 3 /(TiO 2 +Nb 2 O 5 ) Is 2.5 to 3.5.
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 9%, preferably 0 to 4%, 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 6%, preferably 0 to 4%, more preferably 0 to 1%. 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 (2) exceeds 6%, the glass is deteriorated in thermal stability and devitrification resistance. Thus, WO 3 The content of (B) is 0 to 6%, preferably 0 to 4%, more preferably 0.5 to 3%.
In some embodiments, WO is 3 Content of (A) and Y 2 O 3 Ratio between contents of WO 3 /Y 2 O 3 The control is below 0.8, which is beneficial to improving the chemical stability and crystallization resistance of the glass. Thus, WO is preferred 3 /Y 2 O 3 Is 0.8 or less, and WO is more preferable 3 /Y 2 O 3 Is 0.6 or less. Further, control of WO 3 /Y 2 O 3 In the range of 0.02 to 0.5, the hardness and the bubble degree of the glass can be further optimized. Therefore, WO is further preferred 3 /Y 2 O 3 0.02 to 0.5, and further preferably WO 3 /Y 2 O 3 0.05 to 0.3.
In some embodiments, the TiO is 2 Content of (2) and Nb 2 O 5 And WO 3 In total of (A) containsAmount Nb 2 O 5 +WO 3 Ratio of TiO to 2 /(Nb 2 O 5 +WO 3 ) The concentration of the glass is controlled within the range of 0.3 to 3.0, so that the density of the glass can be reduced, and the light transmittance of the glass can be prevented from being reduced. Therefore, tiO is preferred 2 /(Nb 2 O 5 +WO 3 ) 0.3 to 3.0, more preferably TiO 2 /(Nb 2 O 5 +WO 3 ) 0.4 to 2.0. Further, control of TiO 2 /(Nb 2 O 5 +WO 3 ) Within the range of 0.6 to 1.5, the Young's modulus and weather resistance of the glass can be further optimized. Therefore, tiO is more preferable 2 /(Nb 2 O 5 +WO 3 ) 0.6 to 1.5, and TiO is more preferable 2 /(Nb 2 O 5 +WO 3 ) 0.8 to 1.3.
ZnO can adjust the refractive index and dispersion of the glass, and reduce the high-temperature viscosity and 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. Therefore, the content of ZnO is 0 to 8%, preferably 0 to 4%, more preferably 0 to 2%. In some embodiments, it is further preferred that no ZnO is present.
In some embodiments, the content of ZnO is related to SiO 2 And B 2 O 3 SiO in total content 2 +B 2 O 3 Ratio between ZnO/(SiO) 2 +B 2 O 3 ) Controlling the content of the carbon black to be less than 0.5 can improve the meltability of the glass, improve the bubble degree and optimize the abrasion degree. Therefore, znO/(SiO) is preferable 2 +B 2 O 3 ) Is 0.5 or less, and ZnO/(SiO) is more preferable 2 +B 2 O 3 ) Is 0.3 or less, and ZnO/(SiO) is more preferable 2 +B 2 O 3 ) Is 0.2 or less, and ZnO/(SiO) is more preferable 2 +B 2 O 3 ) Is 0.1 or less.
In some embodiments, B is 2 O 3 And TiO 2 2 Total content of (B) 2 O 3 +TiO 2 With SiO 2 And the total content of ZnO SiO 2 + ZnO ratio (B) 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is controlled at 1.0The chemical stability of the glass can be improved within 10.0, and the light transmittance of the glass can be prevented from being reduced. Therefore, (B) is preferred 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is 1.0 to 10.0, more preferably (B) 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is 1.0 to 8.0. Further, by controlling (B) 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is in the range of 1.5 to 7.0, and can further improve the hardness of the glass and reduce the thermal expansion coefficient of the glass. Therefore, (B) is more preferable 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is 1.5 to 7.0, more preferably (B) 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is 2.0 to 5.0.
In some embodiments, the method comprises administering Gd to the subject 2 O 3 And ZnO in total 2 O 3 + ZnO and Y 2 O 3 Ratio between contents of (Gd) 2 O 3 +ZnO)/Y 2 O 3 The thermal expansion coefficient of the glass can be reduced and the abrasion degree of the glass can be optimized by controlling the thermal expansion coefficient to be less than 1.0. Therefore, (Gd) is preferable 2 O 3 +ZnO)/Y 2 O 3 Is 1.0 or less, more preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.6 or less. Further, control (Gd) 2 O 3 +ZnO)/Y 2 O 3 When the content is 0.3 or less, the glass can be easily provided with a suitable Young's modulus, and the glass hardness can be prevented from being lowered. Therefore, (Gd) is more preferable 2 O 3 +ZnO)/Y 2 O 3 Is 0.3 or less, and is more preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.1 or less.
Ta 2 O 5 The glass has the effects of improving the refractive index and improving 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 present invention 2 O 5 The content of (B) is limited to 0 to 8%, preferably 0 to 4%, more preferably 0 to 2%. In some embodimentsAmong them, it is further preferable not to contain Ta 2 O 5 。
In some embodiments, ta 2 O 5 And Gd 2 O 3 Total content Ta of 2 O 5 +Gd 2 O 3 And Y 2 O 3 Ratio between contents of (Ta) 2 O 5 +Gd 2 O 3 )/Y 2 O 3 The control below 1.0 is beneficial to obtaining proper abrasion degree of the glass, optimizing the density and Young modulus of the glass and preventing the chemical stability of the glass from being deteriorated. Therefore, (Ta) is preferable 2 O 5 +Gd 2 O 3 )/Y 2 O 3 Is 1.0 or less, more preferably (Ta) 2 O 5 +Gd 2 O 3 )/Y 2 O 3 Is 0.6 or less, and (Ta) is more preferable 2 O 5 +Gd 2 O 3 )/Y 2 O 3 Is 0.4 or less, more preferably (Ta) 2 O 5 +Gd 2 O 3 )/Y 2 O 3 Is 0.1 or less.
Al 2 O 3 The chemical stability of the glass can be improved, but when the content exceeds 5%, 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 5%, preferably 0 to 3%, more preferably 0 to 1%. In some embodiments, it is further preferred that Al is absent 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 of the glass can be used as a clarifying agent to improve the clarification effect of the glass and improve the bubbles of the glassThe content of the clarifying agent is preferably 0 to 1%, more preferably 0 to 0.5%. 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 thereof promotes corrosion of the platinum or platinum alloy vessel from which the glass is melted and 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 Action and content ratio of (B) and 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 the glass contains a small amount of oxides of transition metals such as V, cr, mn, fe, co, ni, cu, ag, and Mo 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 effect of the present invention to improve the visible light transmittance.
In recent years, oxides of Th, cd, tl, os, be, and Se tend to Be used as harmful chemical substances in a controlled manner, and measures for protecting the environment are required not only in the glass production process but also in the processing process and disposal after commercialization. Therefore, when importance is attached to the influence on the environment, it is preferable that these components are not substantially contained except for inevitable mixing. Thereby, the optical glass becomes practically free from substances contaminating the environment. Therefore, the optical glass of the present invention can be manufactured, processed, and discarded without taking special measures for environmental countermeasures.
In order to achieve environmental friendliness, the optical glass of the present invention preferably does not contain As 2 O 3 And PbO.
"0%" or "0%" is not contained in the present invention, and means that the compound, molecule, element or the like is not intentionally added to the optical glass of the present invention as a raw material; however, it is within the scope of the present invention that certain impurities or components which are not intentionally added may be present as raw materials and/or equipment for producing the optical glass and may be contained in the final optical glass in small or trace amounts.
The properties of the 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 optical glass of the present invention d ) The lower limit of (b) is 1.92, the preferred lower limit is 1.93, and the more preferred lower limit is 1.94.
In some embodiments, the refractive index (n) of the optical glass of the present invention d ) The upper limit of (2) is 1.98, preferably the upper limit is 1.97, and more preferably the upper limit is 1.96.
In some embodiments, the Abbe number (v) of the optical glass of the present invention d ) The lower limit of (2) is 29, preferably 30, and more preferably 31.
In some embodiments, the Abbe number (. Nu.s) of the optical glass of the present invention d ) The upper limit of (2) is 36, preferably 35, more preferably 34.
< Density >
The density (. Rho.) of the optical glass was measured according to the method specified in GB/T7962.20-2010.
In some embodiments, the optical glass of the present invention has a density (. Rho.) of 5.10g/cm 3 Hereinafter, preferably 5.00g/cm 3 Hereinafter, more preferably 4.95g/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 optical glass of the present invention has a coefficient of thermal expansion (α) -30/70℃ ) Is 85X 10 -7 Preferably 80X 10 or less,/K -7 A value of not more than 75X 10 -7 A value of 70X 10 or less, more preferably -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 optical glass of the present invention has stability to water effects (D) W ) Is 2 or more, preferably 1.
< stability against acid Effect >
Stability of acid resistance of optical glasses (D) A ) (powder method) the test was carried out according to the method described in GB/T17129.
In some embodiments, the stability to acid action of the optical glasses of the invention (D) A ) 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 [ alpha ] 70 The wavelength corresponding to the glass transmittance of 70% is meant. Lambda [ alpha ] 70 Is measured by measuring the spectral transmittance in a wavelength region from 280nm to 700nm using a glass having a thickness of 10. + -. 0.1mm with two opposing planes parallel to each other and optically polished and exhibiting a wavelength of 70% transmittance. 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 quantity 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 rarely colored and has a high light transmittance.
In some embodiments, the λ of the optical glass of the present invention 70 Is 425nm or less, preferably lambda 70 Is 420nm or less, more preferably lambda 70 Is 415nm or less.
In some embodiments, the λ of the optical glass of the present invention 5 Is 375nm or less, preferably lambda 5 Is 370nm or less, more preferably λ 5 Is 365nm or less.
< weather resistance >
The optical glass was tested for weatherability (CR) 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. Weather resistance categories were classified according to the amount of change in haze 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.
< 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 650X 10 7 Pa or more, preferably 660X 10 7 Pa or more, more preferably 670X 10 7 Pa or more, and more preferably 680X 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 lower limit of the Young's modulus (E) of the optical glass of the present invention is 11000X 10 7 Pa, preferably lower limit of 11500X 10 7 Pa, more preferably lower limit of 12000X 10 7 Pa, more preferably a lower limit of 12500X 10 7 Pa。
In some embodiments, the Young's modulus (E) of the optical glass of the present invention has an upper limit of 15000X 10 7 Pa, preferably upper limit of 14500X 10 7 Pa, more preferably 14000X 10 7 Pa, more preferably 13500X 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 bubble degree of class A or more, preferably class A 0 More preferably A or more 00 And (4) stages.
< degree of abrasion >
Degree of abrasion (F) of optical glass A ) The abrasion loss of the sample is multiplied by 100 under the same conditions, and the value is expressed by the following formula:
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 optical glass of the present invention has an abrasion degree (F) A ) The lower limit of (2) is 80, preferably 90, and more preferably 95.
In some embodiments, the optical glass of the present invention has an abrasion loss (F) A ) Preferably, the upper limit of (2) is 130, more preferably 120, and still more preferably 115.
[ method for producing optical glass ]
The method for manufacturing the optical glass comprises the following steps: the glass of the present invention is produced by using conventional materials and processes including but not limited to oxides, hydroxides, complex salts (such as carbonates, nitrates, sulfates, etc.), boric acid, etc. as raw materials, blending by conventional methods, then putting the blended charge into a melting furnace (such as platinum or platinum alloy crucible) at 1200-1450 ℃ to melt, and after clarification and homogenization, obtaining homogeneous molten glass without bubbles and undissolved substances, and casting and annealing the molten glass in a mold. Those skilled in the art can appropriately select the raw materials, the process method and the process parameters according to the actual needs.
Glass preform and optical element
The glass preform can be produced from the optical glass produced by 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 machining such as grinding and polishing, or by producing a preform for press molding from an optical glass, by subjecting the preform to reheat press molding and then to polishing. It should be noted that the means for producing the glass preform is not limited to the above means.
As described above, the optical glass of the present invention is useful for various optical elements and optical designs, and among them, it is particularly preferable to form a preform from the optical glass of the present invention, and use the preform to produce optical elements such as lenses and prisms by reheat press forming, precision press forming, and the like.
The glass preform of the present invention and the optical element are each formed of the above-described optical glass of the present invention. The glass preform of the present invention has excellent characteristics possessed by optical glass; the optical element of the present invention has excellent characteristics of optical glass, and can provide optical elements such as various lenses and prisms having high optical values.
Examples of the lens include various lenses such as a concave meniscus lens, a convex meniscus lens, a double convex lens, a double concave lens, a plano-convex lens, and a plano-concave lens, each of which has a spherical or aspherical lens surface.
[ optical Instrument ]
The optical element formed by the optical glass can be used for manufacturing optical instruments such as photographic equipment, camera equipment, projection equipment, display equipment, vehicle-mounted equipment, monitoring equipment and the like.
Examples
< example of optical glass >
In order to further clarify the explanation and explanation of the technical solution of the present invention, the following non-limiting examples are provided.
In this example, optical glasses having compositions shown in tables 2 to 4 were obtained by the above-mentioned method for producing optical glasses. The characteristics of each glass were measured by the test method described in the present invention, and the measurement results are shown in tables 2 to 4.
Table 2.
Table 3.
Table 4.
< glass preform example >
The glasses obtained in examples 1 to 24# of the optical glasses were subjected to press molding such as polishing or reheat press molding or precision press molding to prepare preforms for various lenses such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses and plano-concave lenses, prisms and the like.
< 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 further 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 (14)
1. Optical glass, characterized in that its components, expressed in weight percent, contain: siO 2 2 +B 2 O 3 ：8～28％；La 2 O 3 +Y 2 O 3 +Gd 2 O 3 ：46～70％；ZrO 2 ：1～12％；Nb 2 O 5 ：4～20％；TiO 2 :4 to 18 percent of La 2 O 3 /(TiO 2 +Nb 2 O 5 ) Is 1.2 to 6.0.
2. An optical glass according to claim 1, characterised in that it further comprises, in percentages by weight: ta 2 O 5 :0 to 8 percent; and/or RO:0 to 9 percent; and/or Rn 2 O:0 to 6 percent; and/or WO 3 :0 to 6 percent; and/or ZnO:0 to 8 percent; and/or Al 2 O 3 :0 to 5 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).
3. An 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 8 to 28 percent of SiO 2 +B 2 O 3 And 46 to 70% of La 2 O 3 +Y 2 O 3 +Gd 2 O 3 Wherein La 2 O 3 /(TiO 2 +Nb 2 O 5 ) 1.2 to 6.0, the refractive index n of the optical glass d Is 1.92 to 1.98, abbe number v d 29 to 36, and a Young's modulus E of 11000X 10 7 Pa～15000×10 7 Pa，λ 70 Has a wavelength of 425nm or less and a 5 Has a wavelength of 375nm or less.
4. An optical glass according to claim 3, characterised in that its composition, expressed in weight percentage, comprises: zrO (ZrO) 2 :1 to 12 percent; and/or Nb 2 O 5 :4 to 20 percent; and/or TiO 2 :4 to 18 percent; and/or Ta 2 O 5 :0 to 8 percent; and/or RO:0 to 9 percent; and/or Rn 2 O:0 to 6 percent; and/or WO 3 :0 to 6 percent; and/or ZnO:0 to 8 percent; and/or Al 2 O 3 :0 to 5 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. An optical glass according to any one of claims 1 to 4, characterised in that its components, expressed in weight percentage, are: la 2 O 3 /(TiO 2 +Nb 2 O 5 ) 1.5 to 5.0, preferably La 2 O 3 /(TiO 2 +Nb 2 O 5 ) Is 2.0 to 4.0, more preferably La 2 O 3 /(TiO 2 +Nb 2 O 5 ) 2.5 to 3.5; and/or TiO 2 /Y 2 O 3 0.3 to 4.0, preferably TiO 2 /Y 2 O 3 Is 0.5 to 3.0More preferably TiO 2 /Y 2 O 3 Is 0.6 to 2.0, and TiO is more preferable 2 /Y 2 O 3 0.75 to 1.5; and/or Y 2 O 3 /B 2 O 3 0.4 to 3.0, preferably Y 2 O 3 /B 2 O 3 Is 0.5 to 2.5, more preferably Y 2 O 3 /B 2 O 3 Is 0.6 to 1.5, and Y is more preferably 2 O 3 /B 2 O 3 0.7 to 1.2; and/or (B) 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is 1.0 to 10.0, preferably (B) 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is 1.0 to 8.0, more preferably (B) 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is 1.5 to 7.0, and (B) is more preferable 2 O 3 +TiO 2 )/(SiO 2 + ZnO) is 2.0 to 5.0.
6. An optical glass according to any one of claims 1 to 4, characterised in that its components, expressed in weight percentage, are: (Ta) 2 O 5 +Gd 2 O 3 )/Y 2 O 3 Is 1.0 or less, preferably (Ta) 2 O 5 +Gd 2 O 3 )/Y 2 O 3 Is 0.6 or less, more preferably (Ta) 2 O 5 +Gd 2 O 3 )/Y 2 O 3 Is 0.4 or less, more preferably (Ta) 2 O 5 +Gd 2 O 3 )/Y 2 O 3 Is 0.1 or less; and/or TiO 2 /(Nb 2 O 5 +WO 3 ) 0.3 to 3.0, preferably TiO 2 /(Nb 2 O 5 +WO 3 ) Is 0.4 to 2.0, more preferably TiO 2 /(Nb 2 O 5 +WO 3 ) Is 0.6 to 1.5, and TiO is more preferable 2 /(Nb 2 O 5 +WO 3 ) 0.8 to 1.3; and/or ZnO/(SiO) 2 +B 2 O 3 ) Is 0.5 or less, and ZnO/(SiO) is preferred 2 +B 2 O 3 ) Is 0.3 or less, and ZnO/(SiO) is more preferable 2 +B 2 O 3 ) Is 0.2 or less, and ZnO/(SiO) is more preferable 2 +B 2 O 3 ) Is 0.1 or less; and/or (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 1.0 or less, preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.6 or less, more preferably (Gd) 2 O 3 +ZnO)/Y 2 O 3 Is 0.3 or less, and (Gd) is more preferable 2 O 3 +ZnO)/Y 2 O 3 Is 0.1 or less; and/or WO 3 /Y 2 O 3 Is 0.8 or less, preferably WO 3 /Y 2 O 3 Is 0.6 or less, and WO is more preferable 3 /Y 2 O 3 0.02 to 0.5, and further preferably WO 3 /Y 2 O 3 0.05 to 0.3.
7. An optical glass according to any one of claims 1 to 4, characterized in that its composition, expressed in weight percentages, is such that: la 2 O 3 +Y 2 O 3 +Gd 2 O 3 :50 to 68%, preferably La 2 O 3 +Y 2 O 3 +Gd 2 O 3 :55 to 65 percent; and/or SiO 2 +B 2 O 3 :10 to 25%, preferably SiO 2 +B 2 O 3 :12 to 20 percent; and/or ZrO 2 :3 to 10%, preferably ZrO 2 :4 to 9 percent; and/or Nb 2 O 5 :5 to 15%, preferably Nb 2 O 5 :7 to 12 percent; and/or Ta 2 O 5 :0 to 4%, preferably Ta 2 O 5 :0 to 2 percent; and/or TiO 2 :5 to 13%, preferably TiO 2 :6 to 12 percent; and/or RO:0 to 4%, preferably RO:0 to 2 percent; and/or Rn 2 O:0 to 4%, preferably Rn 2 O:0 to 1 percent; and/or WO 3 :0 to 4%, preferably WO 3 :0.5 to 3 percent; and/or ZnO:0 to 4%, preferably ZnO:0 to 2 percent; and/or Al 2 O 3 :0 to 3%, preferably Al 2 O 3 :0 to 1 percent; and/or Yb 2 O 3 :0 to 5%, preferably Yb 2 O 3 :0 to 1 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 mixture,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).
8. An optical glass according to any one of claims 1 to 4, characterised in that its components, expressed in weight percentage, are: siO 2 2 :1 to 12%, preferably SiO 2 :2 to 10%, more preferably SiO 2 :4 to 9 percent; and/or B 2 O 3 :5 to 18%, preferably B 2 O 3 :6 to 14%, more preferably B 2 O 3 :7 to 12 percent; and/or La 2 O 3 :40 to 60%, preferably La 2 O 3 :43 to 58%, more preferably La 2 O 3 :46 to 53 percent; and/or Y 2 O 3 :4 to 20%, preferably Y 2 O 3 :5 to 15%, more preferably Y 2 O 3 :6 to 12 percent; and/or Gd 2 O 3 :0 to 9%, preferably Gd 2 O 3 :0 to 5%, more preferably Gd 2 O 3 :0 to 3%, and Gd is more preferable 2 O 3 ：0～1％。
9. An optical glass according to any one of claims 1 to 4, characterised in that it does not contain Ta in its composition 2 O 5 (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.
10. The optical glass according to any one of claims 1 to 4, wherein the refractive index n of the optical glass d Is 1.92 to 1.98, preferably 1.93 to 1.97, more preferably 1.94 to 1.96, abbe number v d Is 29 to 36, preferably 30 to 35, more preferably 31 to 34.
11. The optical glass according to any one of claims 1 to 4, wherein the density p of the optical glass is 5.10g/cm 3 Below, preferably 5.00g/cm 3 Hereinafter, more preferably 4.95g/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 not more than 75X 10 -7 A value of 70X 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 stability against acid action D A Is 2 or more, preferably 1; and/or lambda 70 Is 425nm or less, preferably lambda 70 Is 420nm or less, more preferably lambda 70 415nm or less; and/or lambda 5 Is 375nm or less, preferably lambda 5 Is 370nm or less, more preferably λ 5 Is less than 365 nm; and/or the weather resistance CR is of class 2 or more, preferably of class 1; and/or Knoop hardness H K Is 650 x 10 7 Pa or more, preferably 660X 10 7 Pa or more, more preferably 670X 10 7 Pa or more, more preferably 680X 10 7 Pa or above; and/or a Young's modulus E of 11000X 10 7 Pa～15000×10 7 Pa, preferably 11500X 10 7 Pa～14500×10 7 Pa, more preferably 12000X 10 7 Pa～14000×10 7 Pa, more preferably 12500X 10 7 Pa～13500×10 7 Pa; and/or the degree of bubbling is class A or more, preferably class A 0 More preferably A or more 00 A stage; and/or degree of wear F A Is 80 to 130, preferably 90 to 120, more preferably 95 to 115.
12. A glass preform, characterized by being made of the optical glass according to any one of claims 1 to 11.
13. An optical element produced from the optical glass according to any one of claims 1 to 11 or the glass preform according to claim 12.
14. An optical device comprising the optical glass according to any one of claims 1 to 11 and/or comprising the optical element according to claim 13.
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