Classifications

• • 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

Definitions

• the invention relates to an optical glass, in particular to a high-refractive-index optical glass with low thermal expansion coefficient and suitable for precision molding, as well as glass preforms and optical components made of the same.
• Optical glass is a glass material used to manufacture lenses, prisms, mirrors and windows in optical instruments or mechanical systems.
• the mainstream method of manufacturing optical glass into optical components is precision molding (including direct molding and secondary molding).
• Lenses manufactured by precision molding usually do not need to be ground and polished, thereby reducing the consumption of raw materials.
• the cost of manpower and material resources is reduced, and environmental pollution is reduced, and the technology can mass-produce optical components at low cost.
• the so-called precision molding is to use a high-precision mold with a predetermined product shape to mold a glass preform under a certain temperature and pressure, so as to obtain a glass product with the final product shape and optical function.
• Various optical glass products such as spherical lenses, aspherical lenses, prisms and diffraction gratings, can be manufactured through precision molding technology.
• the transition temperature (T g ) of the glass material used for molding needs to be as low as possible.
• optical glass With the advancement of technology and the continuous updating of optoelectronic information products, the demand for optical glass is also increasing, and higher requirements are also placed on the performance of optical glass. For example, because the thermal expansion coefficient of optical glass is too large, it is easy to cause cracks in the thermal processing process, reducing the yield of glass components; at the same time, it also leads to poor thermal shock resistance of optical glass.
• the glass with higher refractive index can obtain a larger imaging field of view.
• the demand for glass with high refractive index becomes more and more obvious.
• the technical problem to be solved by the present invention is to provide a high refractive index optical glass with low thermal expansion coefficient and suitable for precision molding.
• Optical glass whose components are expressed in weight percentage, and contains: B 2 O 3 : 8-20%; La 2 O 3 : 21-40%; Gd 2 O 3 : 6-20%; ZrO 2 : 1 ⁇ 10%; ZnO: 7 ⁇ 20%; WO 3 : 8 ⁇ 20%; TiO 2 : greater than 0 but less than or equal to 10%, wherein (WO 3 +ZnO)/(La 2 O 3 +TiO 2 +ZrO 2 ) is 0.3 to 1.5.
• optical glass according to (1) wherein the components are expressed in weight percentage, and further contains: SiO 2 : 0-9%; and/or Y 2 O 3 : 0-10%; and/or Yb 2 O 3 : 0-10%; and/or Nb 2 O 5 : 0-8%; and/or Rn 2 O: 0-10%; and/or RO: 0-10%; and/or Al 2 O 3 : 0-5%; and/or Ta 2 O 5 : 0-5%; and/or clarifying agent: 0-1%, the Rn 2 O is one of Li 2 O, Na 2 O and K 2 O one or more, RO is one or more of MgO, CaO, SrO, BaO, and the clarifying agent is one or more of Sb 2 O 3 , SnO 2 , SnO and CeO 2 .
• Optical glass containing B 2 O 3 , La 2 O 3 , Gd 2 O 3 , ZrO 2 , ZnO, WO 3 and TiO 2 as essential components, and its components are expressed in weight percent, wherein (WO 3 + ZnO)/(La 2 O 3 +TiO 2 +ZrO 2 ) is 0.3-1.5, the refractive index n d of the optical glass is 1.85-1.91, the Abbe number ⁇ d is 32-38.5, and the thermal expansion coefficient ⁇ is 100/300 °C is 100 ⁇ 10 -7 /K or less.
• Optical glass its components are expressed in weight percentage, B 2 O 3 : 8-20%; La 2 O 3 : 21-40%; Gd 2 O 3 : 6-20%; ZrO 2 : 1-20% 10%; ZnO: 7-20%; WO 3 : 8-20%; TiO 2 : greater than 0 but less than or equal to 10%; SiO 2 : 0-9%; Y 2 O 3 : 0-10%; Yb 2 O 3 : 0-10%; Nb 2 O 5 : 0-8%; Rn 2 O: 0-10%; RO: 0-10%; Al 2 O 3 : 0-5%; Ta 2 O 5 : 0 ⁇ 5%; clarifier: 0 ⁇ 1% composition, wherein (WO 3 +ZnO)/(La 2 O 3 +TiO 2 +ZrO 2 ) is 0.3 ⁇ 1.5, and the Rn 2 O is Li 2 O, Na 2 One or more of O, K 2 O, RO is one or more of MgO, CaO, S
• Nb 2 O 5 /Y 2 O 3 is 0.1 to 2.5;
• Y 2 O 3 /WO 3 is 0.05 to 1.0
• Y 2 O 3 /TiO 2 is 0.2 to 3.5;
• 5 ⁇ Nb 2 O 5 /(WO 3 +Gd 2 O 3 ) is 0.05 to 1.5;
• ZnO/La 2 O 3 is 0.2 ⁇ 0.8;
• Gd 2 O 3 /(La 2 O 3 +Y 2 O 3 ) is 0.2 to 0.8;
• Nb 2 O 5 /WO 3 is 0.03 to 0.7.
• Nb 2 O 5 /Y 2 O 3 is 0.25 to 1.5;
• Y 2 O 3 /TiO 2 is 0.5 to 2.0;
• 5 ⁇ Nb 2 O 5 /(WO 3 +Gd 2 O 3 ) is 0.1 to 1.0;
• ZnO/La 2 O 3 is 0.3 ⁇ 0.7;
• Gd 2 O 3 /(La 2 O 3 +Y 2 O 3 ) is 0.25 to 0.65;
• Nb 2 O 5 /WO 3 is 0.05 to 0.5.
• Nb 2 O 5 /Y 2 O 3 is 0.3 to 0.8;
• Y 2 O 3 /TiO 2 is 0.8 to 1.3;
• 5 ⁇ Nb 2 O 5 /(WO 3 +Gd 2 O 3 ) is 0.15 to 0.5;
• ZnO/La 2 O 3 is 0.35 ⁇ 0.65;
• Gd 2 O 3 /(La 2 O 3 +Y 2 O 3 ) is 0.35 to 0.55;
• Nb 2 O 5 /WO 3 is 0.06 to 0.4.
• Nb 2 O 5 /Y 2 O 3 is 0.4 to 0.7;
• ZnO/La 2 O 3 is 0.4 ⁇ 0.55;
• Nb 2 O 5 /WO 3 is 0.08 to 0.3.
• optical glass according to any one of (1) to (5), wherein the optical glass has a refractive index n d of 1.85 to 1.91, preferably 1.86 to 1.90, more preferably 1.88 to 1.90; Abbe number ⁇ d is 32-38.5, Preferably it is 33-37.5, More preferably, it is 34-37.
• thermo expansion coefficient ⁇ 100/300°C of the optical glass is 100 ⁇ 10 -7 /K or less, preferably 95 ⁇ 10 -7 /K below, more preferably below 90 ⁇ 10 -7 /K; and/or the transition temperature T g is below 620°C, preferably below 610°C, more preferably below 600°C; and/or the upper limit of crystallization temperature is below 1250°C , preferably 1200°C or lower, more preferably 1180°C or lower, still more preferably 1160°C or lower.
• optical element is made of the optical glass described in any one of (1) to (16) or the glass preform described in (17).
• the beneficial effects of the present invention are: through reasonable component design, the optical glass obtained by the present invention has lower transition temperature and thermal expansion coefficient, and is suitable for precision molding.
• optical glass of this invention is not limited to the following embodiment, It can change suitably within the range of the objective of this invention, and can implement.
• this does not limit the gist of the invention.
• the optical glass of the present invention may be simply referred to as glass.
• each component (component) of the optical glass of the present invention will be described below.
• the content of each component and the total content are all expressed in weight percent (wt%), that is, the content and total content of each component are relative to the total glass substance of the composition converted into oxides. Amounts are expressed in weight percent.
• the “composition in terms of oxides” refers to the case where oxides, complex salts, hydroxides, etc. used as raw materials of the optical glass composition of the present invention are decomposed and converted into oxides when melted. , and the total amount of the oxide is taken as 100%.
• B 2 O 3 is a network forming component, which can improve the thermal stability of the glass and improve the melting property of the glass, so that the glass without the melting residue of the glass raw material can be obtained.
• the content of B 2 O 3 is preferably 10% or more, and more preferably the content of B 2 O 3 is 11 % or more.
• the upper limit of the content of B 2 O 3 in the present invention is 20%, preferably 18%, and more preferably 17%. .
• SiO 2 has the functions of improving the chemical stability of glass, maintaining the viscosity suitable for molten glass molding, and reducing the erosion of refractory materials. If its content is too high, the difficulty of melting the glass will increase, and it will be unfavorable to reduce the transition temperature of the glass. Therefore, in the present invention, the content of SiO 2 is 9% or less, preferably 0.5 to 9%, more preferably 1 to 8%, and further preferably 2 to 6%.
• La 2 O 3 is a high-refractive and low-dispersion component, which can increase the refractive index of the glass, adjust the dispersion, and reduce the high temperature viscosity of the glass.
• the content of La 2 O 3 is more than 21%, preferably La 2
• the content of O 3 is 25% or more, and more preferably the content of La 2 O 3 is 28% or more.
• the content of La 2 O 3 is 40% or less, preferably 38% or less, and more preferably 35% or less.
• Gd 2 O 3 is contained in an amount of 6% or more to improve the chemical stability of the optical glass and adjust the thermal expansion coefficient and refractive index of the glass, preferably the content of Gd 2 O 3 is 8% or more, more preferably Gd 2
• the content of O 3 is 9.5% or more, and more preferably the content of Gd 2 O 3 is 11% or more.
• the content of Gd 2 O 3 is 20% or less, preferably 18% or less, and more preferably 16% or less.
• the meltability and devitrification resistance of the glass are improved while maintaining high refractive index and low dispersion. If the content of Y 2 O 3 exceeds 10%, the stability and devitrification resistance of the glass decrease, and the transition temperature increases. Therefore, the content of Y 2 O 3 is 0 to 10%, preferably more than 0 but less than or equal to 6%. In some embodiments, by including 1% or more of Y 2 O 3 , the glass devitrification limit temperature and density can also be lowered. Therefore, the content of Y 2 O 3 in the present invention is more preferably 1 to 5%.
• Gd 2 O 3 /(La 2 O 3 +Y 2 O 3 ) if Gd 2 O 3 /(La 2 O 3 +Y 2 O 3 ) is lower than 0.2, the stability of the glass is reduced, the temperature coefficient of refractive index is increased, and the glass is affected by temperature changes during use. large; when Gd 2 O 3 /(La 2 O 3 +Y 2 O 3 ) exceeds 0.8, the abrasion degree of the glass deteriorates and the density increases.
• Gd 2 O 3 /(La 2 O 3 +Y 2 O 3 ) is preferably 0.2 to 0.8, more preferably Gd 2 O 3 /(La 2 O 3 +Y 2 O 3 ) is 0.25 to 0.65, and still more preferably Gd 2 O 3 /(La 2 O 3 +Y 2 O 3 ) is 0.35 to 0.55.
• Yb 2 O 3 is also a component that imparts high refraction and low dispersion properties to glass, and is an optional component in the present invention.
• the content of Yb 2 O 3 is limited to 0 to 10%, preferably 0 to 5%, more preferably 0 to 2%, and further preferably not containing Yb 2 O 3 .
• ZnO can adjust the refractive index and dispersion of the glass, reduce the transition temperature, improve the anti-devitrification performance of the glass, and improve the stability of the glass. Melting at low temperature, which can improve the transmittance of glass.
• the above effects are obtained by containing 7% or more of ZnO, preferably 8% or more, more preferably 10% or more, and even more preferably 11% or more.
• the ZnO content is limited to 20% or less, preferably 18% or less, and more preferably 16% or less.
• ZnO/La 2 O 3 is preferably 0.2 to 0.8, more preferably ZnO/La 2 O 3 is 0.3 to 0.7, still more preferably ZnO/La 2 O 3 is 0.35 to 0.65, and still more preferably ZnO/La 2 O 3 is 0.4 to 0.55.
• WO 3 can improve the refractive index and mechanical strength of the glass, and reduce the transition temperature of the glass.
• the above effects are obtained by containing more than 8% of WO 3 , preferably the lower limit of the content of WO 3 is 10%, more preferably the lower limit of the content of WO 3 to 12%.
• the upper limit of the content of WO 3 is 20%, preferably 18%, and more preferably 17%.
• Y 2 O 3 /WO 3 is preferably 0.05 to 1.0, more preferably Y 2 O 3 /WO 3 is 0.1 to 0.6, and still more preferably Y 2 O 3 /WO 3 is 0.1 to 0.4.
• Nb 2 O 5 is a high refractive index and high dispersion component, which can improve the refractive index and devitrification resistance of the glass, and reduce the thermal expansion coefficient of the glass. If the content of Nb 2 O 5 is too high, the thermal stability and chemical stability of the glass will be reduced. , the light transmittance decreases. Therefore, the content of Nb 2 O 5 in the present invention is 0 to 8%, preferably 0.5 to 6%, and more preferably 1 to 5%.
• Nb 2 O 5 , WO 3 and Gd 2 O 3 can produce a complex synergistic effect in glass, especially to make 5 ⁇ Nb 2 O 5 /( When WO 3 +Gd 2 O 3 ) is in the range of 0.05 to 1.5, the glass can obtain good hot-press stability and at the same time have a suitable degree of abrasion, preferably 5 ⁇ Nb 2 O 5 /(WO 3 +Gd 2 O 3 ) is 0.1 to 1.0.
• the thermal expansion coefficient of the glass can be further optimized, so 5 ⁇ Nb 2 O 5 /(WO 3 +Gd 2 O 3 ) is 0.15 to 0.5, more preferably 5 ⁇ Nb 2 O 5 /(WO 3 +Gd 2 O 3 ) is 0.2 to 0.4.
• Nb 2 O 5 /Y 2 O 3 is preferably 0.1 to 2.5, more preferably Nb 2 O 5 /Y 2 O 3 is 0.25 to 1.5, still more preferably Nb 2 O 5 /Y 2 O 3 is 0.3 to 0.8, and more preferably More preferably, Nb 2 O 5 /Y 2 O 3 is 0.4 to 0.7.
• Nb 2 O 5 /WO 3 in the range of 0.03-0.7, it helps to improve the thermal stability of the glass and optimize the chemical stability of the glass, preferably Nb 2 O 5 /WO 3 It is 0.05-0.5, it is more preferable that Nb2O5 /WO3 is 0.06-0.4 , and it is more preferable that Nb2O5 / WO3 is 0.08-0.3 .
• TiO 2 has the effect of increasing the refractive index and dispersion of glass, and an appropriate amount can make the glass more stable and reduce the viscosity of the glass.
• the content of TiO 2 exceeds 10%, the crystallization tendency of the glass increases, the transition temperature of the glass increases, and the glass becomes easy to be colored during press molding. Therefore, in the present invention, the content of TiO 2 is greater than 0 but less than or equal to 10%, preferably the content of TiO 2 is 0.5-7%, more preferably 1-5%.
• Y 2 O 3 /TiO 2 is preferably 0.2 to 3.5, more preferably Y 2 O 3 /TiO 2 is 0.5 to 2.0, and still more preferably Y 2 O 3 /TiO 2 is 0.8 to 1.3.
• ZrO 2 is a high-refractive and low-dispersion component, which can increase the refractive index of the glass, adjust the dispersion, and improve the anti-devitrification performance of the glass.
• the above effects are obtained by containing more than 1% ZrO 2 , preferably The content of ZrO 2 is 2% or more. If the content of ZrO 2 is higher than 10%, the difficulty of melting the glass will increase, the melting temperature will increase, and further, inclusions will appear in the glass and the transmittance will decrease. Therefore, the ZrO 2 content is 10% or less, preferably 8% or less, and more preferably 6% or less.
• the glass by controlling the ratio between the total content of WO 3 and ZnO WO 3 +ZnO and the total content of La 2 O 3 , TiO 2 and ZrO 2 La 2 O 3 +TiO 2 +ZrO 2 When (WO 3 +ZnO)/(La 2 O 3 +TiO 2 +ZrO 2 ) is in the range of 0.3 to 1.5, the glass can obtain a lower thermal expansion coefficient while having a lower transition temperature.
• (WO 3 +ZnO)/(La 2 O 3 +TiO 2 +ZrO 2 ) is preferably 0.3 to 1.5, more preferably (WO 3 +ZnO)/(La 2 O 3 +TiO 2 +ZrO 2 ) is 0.5 to 1.0.
• the bubble degree and abrasion degree of the glass can be further optimized, so (WO 3 + ZnO)/(La 2 O 3 +TiO 2 +ZrO 2 ) is 0.6 to 0.9, and more preferably (WO 3 +ZnO)/(La 2 O 3 +TiO 2 +ZrO 2 ) is 0.7 to 0.85.
• Rn 2 O is an alkali metal oxide
• Rn 2 O is one or more of Li 2 O, Na 2 O and K 2 O, which can improve the melting property of glass and lower the transition temperature of glass.
• the content exceeds 10%, the devitrification resistance of the glass deteriorates, and the refractive index decreases significantly. Therefore, in the present invention, the Rn 2 O content is 0 to 10%, preferably 0 to 5%, and more preferably 0.5 to 3%.
• Li 2 O can reduce the transition temperature of glass, but when its content is high, it is unfavorable to the acid resistance stability and thermal expansion coefficient of the glass. Therefore, the content of Li 2 O in the present invention is 6% or less, preferably greater than 0 but less than or equal to 4 %, more preferably 0.1 to 3%, still more preferably 0.5 to 2%.
• the viscosity of the glass can be optimized, and the striae degree and the bubble degree of the glass can be improved, preferably 5 ⁇ Li 2 O/(TiO 2 +SiO 2 ) is 0.1 to 2.0.
• setting the value of 5 ⁇ Li 2 O/(TiO 2 +SiO 2 ) in the range of 0.2 to 1.0 can significantly improve the moldability of the glass and reduce the probability of fogging of the glass during the molding process. Therefore, 5 ⁇ Li 2 O/(TiO 2 +SiO 2 ) is more preferably 0.2 to 1.0, and still more preferably 5 ⁇ Li 2 O/(TiO 2 +SiO 2 ) is 0.3 to 0.8.
• Na 2 O has the effect of improving the melting property of glass, which can improve the melting effect of glass and lower the transition temperature of glass. If the content of Na 2 O exceeds 5 %, the chemical stability and weather resistance of glass will be reduced.
• the content of Na 2 O is 0-5%, preferably the content of Na 2 O is 0-3%, and the content of Na 2 O is more preferably 0-2%.
• K 2 O has the effect of improving the thermal stability and melting properties of glass, but if its content exceeds 5%, the devitrification resistance of the glass decreases, and the chemical stability of the glass deteriorates. Therefore, the content of K 2 O in the present invention is 5% or less, The content of K 2 O is preferably 0 to 3%, more preferably 0 to 2%.
• RO is an alkaline earth metal oxide
• RO is one or more of MgO, CaO, SrO, and BaO. Adding RO into the glass can improve the melting property of the glass and lower the transition temperature of the glass. If the content of RO exceeds 10%, the devitrification resistance of the glass will decrease. Therefore, in the present invention, the RO content is 0 to 10%, preferably 0 to 5%, more preferably 0 to 2%, and further preferably no RO is contained.
• Al 2 O 3 can improve the chemical stability of glass, but when its content exceeds 5%, the meltability and transmittance of the glass deteriorate. Therefore, the content of Al 2 O 3 in the present invention is 0 to 5%, preferably 0 to 2%, more preferably 0 to 1%, and further preferably not containing Al 2 O 3 .
• Ta 2 O 5 has the functions of increasing the refractive index and improving the devitrification resistance of the glass, but if its content is too high, the chemical stability of the glass decreases, and the optical constant is difficult to control to the desired range; on the other hand, compared with other components , Ta 2 O 5 is very expensive, from the practical and cost point of view, its usage should be minimized. Therefore, the Ta 2 O 5 content in the present invention is limited to 0 to 5%, preferably 0 to 2%, more preferably 0 to 1%, and further preferably not containing Ta 2 O 5 .
• the clarifying effect of the glass can be improved, and the content of the clarifying agent is preferably 0- 0.5%, more preferably 0 to 0.1%.
• the content of Sb 2 O 3 exceeds 1%, the glass tends to reduce the refining performance, and at the same time, due to its strong oxidation effect, it promotes the corrosion of the platinum or platinum alloy utensils in which the glass is melted and the deterioration of the forming mold. Therefore, Sb 2 is preferred in the present invention.
• the addition amount of O 3 is 0 to 1%, more preferably 0 to 0.5%, still more preferably 0 to 0.1%.
• SnO and SnO 2 can also be added as fining agents, but when the content exceeds 1%, the tendency to color the glass increases, or when the glass is heated, softened and reshaped by press molding, Sn will become the origin of crystal nucleation , resulting in a tendency to devitrification. Therefore, the content of SnO 2 in the present invention is preferably 0-1%, more preferably 0-0.5, still more preferably 0-0.1%, and even more preferably not contained; the content of SnO is preferably 0-1%, more preferably 0- 0.5%, more preferably 0 to 0.1%, and still more preferably not contained.
• the function and addition ratio of CeO 2 are the same as those of SnO 2 , and its content is preferably 0 to 1%, more preferably 0 to 0.5%, still more preferably 0 to 0.1%, and still more preferably not contained.
• F fluorine
• F can lead to poor glass stability and reduced devitrification resistance, while its volatility can lead to unstable glass optical constants and streaks Since the degree of intensity deteriorates, it is preferable not to contain F.
• GeO 2 An appropriate amount of GeO 2 can be contained in the glass of the present invention, but in some embodiments, the introduction of GeO 2 will lead to a decrease in the transmittance of the glass, and at the same time, since it is an expensive raw material, it reduces the economy of the glass, so it is preferred Does not contain GeO 2 .
• P 2 O 5 may be contained in the glass of the present invention, but in some embodiments, the inclusion of P 2 O 5 in the glass makes it difficult to obtain a desired high refractive index, and the devitrification resistance of the glass decreases, so it is preferred Does not contain P 2 O 5 .
• Bi 2 O 3 An appropriate amount of Bi 2 O 3 may be contained in the glass of the present invention, but in some embodiments, Bi 2 O 3 will reduce the light transmittance of the glass, deteriorate the abrasion degree and chemical stability, and significantly increase the density, Therefore, it is preferable not to contain Bi 2 O 3 .
• the glass of the present invention even if the oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo are contained in small amounts alone or in combination, the glass will be colored, and in the visible light region Specified wavelengths are absorbed, thereby weakening the property of the present invention to improve the visible light transmittance effect. Therefore, it is preferable not to actually contain the optical glass, which requires transmittance at wavelengths in the visible light region.
• Oxides of Th, Cd, Tl, Os, Be, and Se tend to be used in a controlled manner as harmful chemical substances in recent years, and they are environmentally friendly not only in the manufacturing process of glass, but also in the processing process and disposal after productization. Action is required. Therefore, in the case of attaching importance to the influence on the environment, it is preferable not to actually contain them except for unavoidable mixing. Thereby, the optical glass becomes practically free of substances that pollute the environment. Therefore, the optical glass of the present invention can be manufactured, processed, and discarded without taking special measures for environmental measures.
• the optical glass of the present invention preferably does not contain As 2 O 3 and PbO.
• As 2 O 3 has the effect of eliminating bubbles and preventing glass coloration, the addition of As 2 O 3 will increase the platinum erosion of the glass to the furnace, especially the platinum furnace, resulting in more platinum ions entering the glass. The service life of the platinum furnace is adversely affected.
• Does not contain and "0%” described herein means that the compound, molecule or element, etc. is not intentionally added as a raw material to the optical glass of the present invention; however, as a raw material and/or equipment for producing optical glass, there may be some Impurities or components that are not intentionally added will be contained in a small or trace amount in the final optical glass, and this situation is also within the protection scope of the patent of the present invention.
• the refractive index (n d ) and Abbe number ( ⁇ d ) of optical glass are tested according to the methods specified in GB/T 7962.1-2010.
• the lower limit of the refractive index (n d ) of the optical glass of the present invention is 1.85, preferably the lower limit is 1.86, and more preferably the lower limit is 1.88; the upper limit of the refractive index (n d ) is 1.91, preferably 1.90.
• the lower limit of the Abbe number ( ⁇ d ) of the optical glass of the present invention is 32, preferably the lower limit is 33, and more preferably the lower limit is 34; the upper limit of the Abbe number ( ⁇ d ) is 38.5, and the preferred upper limit is 37.5 , more preferably the upper limit is 37.
• the density ( ⁇ ) of optical glass is tested according to the method specified in GB/T7962.20-2010.
• the density ( ⁇ ) of the optical glass of the present invention is 5.50 g/cm 3 or less, preferably 5.40 g/cm 3 or less, more preferably 5.30 g/cm 3 or less, and even more preferably 5.20 g/cm 3 the following.
• the thermal expansion coefficient ( ⁇ 100/300°C ) of the optical glass is tested according to the method specified in GB/T7962.16-2010 at 100-300°C.
• the thermal expansion coefficient ( ⁇ 100/300°C ) of the optical glass of the present invention is 100 ⁇ 10 -7 /K or less, preferably 95 ⁇ 10 -7 /K or less, more preferably 90 ⁇ 10 -7 /K or less.
• the transition temperature (T g ) of the optical glass is tested according to the method specified in GB/T7962.16-2010.
• the transition temperature (T g ) of the optical glass of the present invention is 620°C or lower, preferably 610°C or lower, and more preferably 600°C or lower.
• the short-wave transmission spectral properties of the glasses of the present invention are expressed in terms of tinting degrees ( ⁇ 70 and ⁇ 5 ).
• ⁇ 70 refers to the wavelength corresponding to the glass transmittance of 70%.
• ⁇ 70 was measured by measuring the spectral transmittance in the wavelength range from 280 nm to 700 nm using glass with a thickness of 10 ⁇ 0.1 mm having two opposite planes parallel to each other and optically polished and showing a wavelength of 70% transmittance.
• the so-called spectral transmittance or transmittance is the amount expressed by I out /I in when light of the intensity I in is incident perpendicularly to the above-mentioned surface of the glass, passes through the glass, and emits light of the intensity I out from one plane, and
• the transmittance of the surface reflection loss on the above-mentioned surface of the glass is also included.
• ⁇ 70 of the optical glass of the present invention is less than or equal to 410 nm, preferably ⁇ 70 is less than or equal to 405 nm, more preferably ⁇ 70 is less than or equal to 400 nm, further preferably ⁇ 70 is less than or equal to 395 nm.
• ⁇ 5 of the optical glass of the present invention is less than or equal to 375 nm, preferably ⁇ 5 is less than or equal to 370 nm, more preferably ⁇ 5 is less than or equal to 365 nm, further preferably ⁇ 5 is less than or equal to 360 nm.
• the acid resistance stability (D A ) (powder method) of optical glass is tested according to the method specified in GB/T 17129.
• the acid resistance stability (D A ) of the optical glass of the present invention is three or more types, preferably two or more types, and more preferably one type.
• the water resistance stability (D W ) (powder method) of optical glass is tested according to the method specified in GB/T 17129.
• the water resistance stability (D W ) of the optical glass of the present invention is 2 or more types, preferably 1 type.
• the crystallization performance of the glass was measured by the temperature gradient furnace method.
• the glass was made into a sample of 180 ⁇ 10 ⁇ 10 mm, the sides were polished, and then placed in a furnace with a temperature gradient (10 °C/cm) and heated to 1300 °C for 4 hours. Take it out and cool it to room temperature naturally, and observe the crystallization of the glass under a microscope.
• the maximum temperature corresponding to the appearance of crystals in the glass is the upper limit temperature of the crystallization of the glass.
• the crystallization upper limit temperature of the optical glass of this invention is 1250 degrees C or less, Preferably it is 1200 degrees C or less, More preferably, it is 1180 degrees C or less, More preferably, it is 1160 degrees C or less.
• the manufacturing method of the optical glass of the present invention is as follows: the glass of the present invention is produced by using conventional raw materials and processes, including but not limited to using carbonates, nitrates, sulfates, hydroxides, oxides, etc. , put the prepared charge into a smelting furnace (such as platinum crucible, alumina crucible, etc.) at 1200 ⁇ 1400 ° C for melting, and after clarification, stirring and homogenization, get no bubbles and no undissolved substances. quality molten glass, which is cast in a mold and annealed. Those skilled in the art can appropriately select raw materials, process methods and process parameters according to actual needs.
• a smelting furnace such as platinum crucible, alumina crucible, etc.
• a glass preform can be produced from the optical glass produced by using, for example, a means of grinding, or a means of press forming such as reheat press forming and precision press forming. That is, a glass preform can be produced by subjecting optical glass to mechanical processing such as grinding and polishing, or by producing a preform for press-molding from optical glass, reheating the preform, and then grinding the preform. Glass preforms are produced by machining, or by precision stamping of preforms produced by grinding.
• the means for preparing the glass preform is not limited to the above-mentioned means.
• the optical glass of the present invention is useful for various optical elements and optical designs, and it is particularly preferable to form a preform from the optical glass of the present invention, and to perform reheat press molding, precision press molding, etc. using the preform , making optical components such as lenses and prisms.
• Both the glass preform and the optical element of the present invention are formed from the optical glass of the present invention described above.
• the glass preform of the present invention has the excellent characteristics of optical glass;
• the optical element of the present invention has the excellent characteristics of optical glass, and can provide various optical elements such as lenses and prisms with high optical value.
• lenses include various lenses such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses whose lens surfaces are spherical or aspherical.
• optical element formed by the optical glass of the present invention can be used to manufacture optical instruments such as photographic equipment, imaging equipment, display equipment and monitoring equipment.
• the optical glass which has the composition shown in Table 1 - Table 2 was obtained by the manufacturing method of the said optical glass.
• the properties of each glass were measured by the test method of the present invention, and the measurement results are shown in Tables 1 to 2.
• a concave meniscus lens, a convex meniscus lens, and a biconvex lens are produced by using the glass obtained in the optical glass Examples 1 to 20, for example, by means of grinding, or by means of press molding such as reheat press molding and precision press molding. , Bi-concave lenses, plano-convex lenses, plano-concave lenses and other lenses, prisms and other prefabricated parts.
• each preform is ground and polished to produce various lenses and prisms such as a concave meniscus lens, a convex meniscus lens, a biconvex lens, a biconcave lens, a plano-convex lens, and a plano-concave lens.
• An antireflection film may also be coated on the surface of the obtained optical element.
• optical elements produced by the above-mentioned optical element embodiments are optically designed and formed by using one or more optical elements to form optical components or optical assemblies, which can be used in, for example, imaging equipment, sensors, microscopes, medical technology, digital projection, communications, optical communications Technology/information transmission, optics/lighting in the automotive field, lithography, excimer lasers, wafers, computer chips and integrated circuits and electronic devices including such circuits and chips, or camera equipment and devices for the automotive field.

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• 2020
  • 2020-09-07 CN CN202010928384.9A patent/CN111977970B/zh active Active
• 2021
  • 2021-07-21 WO PCT/CN2021/107560 patent/WO2022048335A1/zh not_active Ceased
  • 2021-07-21 JP JP2023515188A patent/JP7612003B2/ja active Active
  • 2021-07-30 TW TW110128064A patent/TWI783603B/zh active

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