TW202408955A - Optical glass, optical element and optical instrument - Google Patents

Abstract

The present invention provides optical glass, the components thereof comprising, in percentages by weight: SiO2: 1-12%; B2O3: 5-18%; La2O3: 40-60%; Y2O3: 4-20%; ZrO2: 1-12%; Nb2O5: 4-20%; and TiO2: 4-18%. In the present invention, by means of reasonable component design, optical glass having good devitrification resistance can be obtained at a low raw material cost.

Description

Optical glass, optical components and optical instruments

The present invention relates to an optical glass, in particular to an optical glass with a refractive index n _d of 1.92 to 1.98 and an Abbe number v _d of 29 to 36, as well as optical elements and optical instruments made therefrom.

In recent years, with the advancement of science and technology and the continuous updating of optoelectronic information products, the demand for optical glass has gradually increased, and at the same time, higher requirements have been put forward for the performance of optical glass. Under the same radius of curvature, the higher the refractive index of glass, the larger the imaging field of view. With the development trend of miniaturization of optical devices, the demand for high refractive index glass is becoming more and more obvious. Optical glass with a refractive index n _d of 1.92 to 1.98 and an Abbe number v _d of 29 to 36 has a higher refractive index and is easier to achieve miniaturization, ultra-thinness, and wide-angle use, and its application scenarios are relatively wide.

Due to the large demand for high refractive index optical glass, it is expected that it can be manufactured with lower raw material costs to improve continuous supply capabilities. CN110128005A discloses a high refractive index optical glass with a refractive index _nd of more than 1.87 and an Abbe number _vd of less than 40. It contains a large amount of Gd ₂ O ₃ and WO ₃ , which is not conducive to cost control. JP2019-11232A discloses a high-refractive index optical glass that contains a large amount of BaO, and its devitrification resistance needs to be improved.

The technical problem to be solved by the present invention is to provide an optical glass with lower raw material cost and excellent devitrification resistance.

The technical solution adopted by the present invention to solve the technical problem is:

An optical glass, whose components, expressed in weight percentage, contain: SiO ₂ : 1-12%; B ₂ O ₃ : 5-18%; La ₂ O ₃ : 40-60%; Y ₂ O ₃ : 4-20%; ZrO ₂ : 1-12%; Nb ₂ O ₅ : 4-20%; TiO ₂ : 4-18%.

Furthermore, the optical glass, whose components are expressed in weight percentage, also contains: Gd ₂ O ₃ : 0 to 9%; and/or Ta ₂ O ₅ : 0 to 8%; and/or RO: 0 to 8%. 9%; and/or Rn ₂ O: 0 to 6%; and/or WO ₃ : 0 to 6%; and/or ZnO: 0 to 8%; and/or Al ₂ O ₃ : 0 to 5%; and /or Yb ₂ O ₃ : 0 to 10%; and / or GeO ₂ : 0 to 5%; and / or clarifier: 0 to 2%, and the RO is one or more of MgO, CaO, SrO, and BaO , Rn ₂ O is one or more of Li ₂ O, Na ₂ O, and K ₂ O, and the clarifier is one or more of Sb ₂ O ₃ , SnO, SnO ₂ , and CeO ₂ .

An optical glass whose components are expressed in weight percentage, consisting of SiO ₂ : 1 to 12%; B ₂ O ₃ : 5 to 18%; La ₂ O ₃ : 40 to 60%; Y ₂ O ₃ : 4 to 20% ;ZrO ₂ : 1～12%; Nb ₂ O ₅ : 4～20%; TiO ₂ : 4～18%; Gd ₂ O ₃ : 0～9%; Ta ₂ O ₅ : 0～8%; RO: 0 ~9%; Rn ₂ O: 0 ~ 6%; WO ₃ : 0 ~ 6%; ZnO: 0 ~ 8%; Al ₂ O ₃ : 0 ~ 5%; Yb ₂ O ₃ : 0 ~ 10%; GeO ₂ : 0 to 5%; Clarifying agent: 0 to 2% composition, the RO is one or more of MgO, CaO, SrO, and BaO, and Rn ₂ O is one of Li ₂ O, Na ₂ O, and K ₂ O or more, and the clarifying agent is one or more of Sb ₂ O ₃ , SnO, SnO ₂ , and CeO ₂ .

Furthermore, the optical glass has components expressed in weight percentage, wherein La ₂ O ₃ +Y ₂ O ₃ +Gd ₂ O ₃ is 46-70%, preferably La ₂ O ₃ +Y ₂ O ₃ +Gd ₂ O ₃ is 50-68%, and more preferably La ₂ O ₃ +Y ₂ O ₃ +Gd ₂ O ₃ is 55-65%.

Further, the components of the optical glass are expressed in weight percent, wherein: SiO ₂ +B ₂ O ₃ is 8 to 28%, preferably SiO ₂ +B ₂ O ₃ is 10 to 25%, and more preferably SiO ₂ +B ₂ O ₃ is 12 to 20%.

Furthermore, the optical glass has components expressed in weight percentage, wherein: (B ₂ O ₃ +TiO ₂ )/(SiO ₂ +ZnO) is 1.0-10.0, preferably (B ₂ O ₃ +TiO ₂ )/(SiO ₂ +ZnO) is 1.0-8.0, more preferably (B ₂ O ₃ +TiO ₂ )/(SiO ₂ +ZnO) is 1.5-7.0, and further preferably (B ₂ O ₃ +TiO ₂ )/(SiO ₂ +ZnO) is 2.0-5.0.

Furthermore, the optical glass has components expressed in weight percentage, wherein: (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is less than 1.0, preferably (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is less than 0.6, more preferably (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is less than 0.4, and further preferably (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is less than 0.1.

Furthermore, the optical glass has components expressed in weight percentage, wherein: TiO ₂ /Y ₂ O ₃ is 0.3-4.0, preferably TiO ₂ /Y ₂ O ₃ is 0.5-3.0, more preferably TiO ₂ /Y ₂ O ₃ is 0.6-2.0, and further preferably TiO ₂ /Y ₂ O ₃ is 0.75-1.5.

Furthermore, the optical glass _has components expressed in weight percentage, wherein: _Y2O3 / _{B2O3 is 0.4-3.0 , preferably Y2O3} / _B2O3 is 0.5-2.5 _, more preferably _Y2O3 / _B2O3 is 0.6-1.5, and further preferably _Y2O3 / _B2O3 is _{0.7-1.2 .}

Further, the components of the optical glass are expressed in weight percent, wherein: La ₂ O ₃ /(TiO ₂ +Nb ₂ O ₅ ) is 1.2 to 6.0, preferably La ₂ O ₃ /(TiO ₂ +Nb ₂ O ₅ ) is 1.5 to 5.0, more preferably La ₂ O ₃ /(TiO ₂ +Nb ₂ O ₅ ) is 2.0 to 4.0, and even more preferably La ₂ O ₃ /(TiO ₂ +Nb ₂ O ₅ ) is 2.5 to 3.5.

Further, the components of the optical glass are expressed in weight percent, wherein: TiO2/(Nb2O5+WO3) is 0.3~3.0, preferably TiO2/(Nb2O5+WO3) is 0.4~2.0, and more preferably TiO2/(Nb2O5 +WO3) is 0.6 to 1.5, and further preferably TiO2/(Nb2O5+WO3) is 0.8 to 1.3.

Furthermore, the optical glass has components expressed in weight percentage, wherein: ZnO/(SiO ₂ +B ₂ O ₃ ) is less than 0.5, preferably ZnO/(SiO ₂ +B ₂ O ₃ ) is less than 0.3, more preferably ZnO/(SiO ₂ +B ₂ O ₃ ) is less than 0.2, and further preferably ZnO/(SiO ₂ +B ₂ O ₃ ) is less than 0.1.

Furthermore, the optical glass has components expressed in weight percentage, wherein: (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is less than 1.0, preferably (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is less than 0.6, more preferably (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is less than 0.3, and further preferably (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is less than 0.1.

Further, the components of the optical glass are expressed in weight percent, wherein: WO ₃ /Y ₂ O ₃ is 0.8 or less, preferably WO ₃ /Y ₂ O ₃ is 0.6 or less, and more preferably WO ₃ /Y ₂ O ₃ is 0.02 to 0.5, and more preferably WO ₃ /Y ₂ O ₃ is 0.05 to 0.3.

Furthermore, the optical glass, wherein the components are expressed in weight percentage, wherein: SiO ₂ : 2-10%, preferably SiO ₂ : 4-9%; and/or B ₂ O ₃ : 6-14%, preferably B ₂ O ₃ : 7-12%; and/or La ₂ O ₃ : 43-58%, preferably La ₂ O ₃ : 46-53%; and/or Y ₂ O ₃ : 5-15%, preferably Y ₂ O ₃ : 6-12%; and/or ZrO ₂ : 3-10%, preferably ZrO ₂ : 4-9%; and/or Nb ₂ O ₅ : 5-15%, preferably Nb ₂ O ₅ : 7-12%; and/or Ta ₂ O ₅ : 0-4%, preferably Ta ₂ O ₅ : 0-2%; and/or Gd ₂ O ₃ : 0-5%, preferably Gd ₂ O ₃ : 0-3%, preferably Gd ₂ O ₃ : 0-1%; and/or TiO ₂ : 5-13%, preferably TiO ₂ : 6-12%; and/or RO: 0-4%, preferably RO: 0-2%; and/or Rn ₂ O: 0-4%, preferably Rn ₂ O: 0-1%; and/or WO ₃ : 0-4%, preferably WO ₃ : 0.5-3%; and/or ZnO: 0-4%, preferably ZnO: 0-2%; and/or Al ₂ O ₃ : 0-3%, preferably Al ₂ O ₃ : 0-1%; and/or Yb ₂ O ₃ : 0-5%, preferably Yb ₂ O ₃ : 0-1%; and/or GeO ₂ : 0-3%, preferably GeO ₂ : 0-1%; and/or clarifier: 0-1%, preferably clarifier: 0-0.5%, the RO is one or more of MgO, CaO, SrO, BaO, _Rn2O is one or more of _Li2O , _Na2O , _K2O , the clarifier is one or more of _Sb2O3 , _SnO , _SnO2 , _CeO2 .

Further, the components of the optical glass are expressed in weight percent, and the total content of SiO ₂ , B ₂ O ₃ , La ₂ O ₃ , Y ₂ O ₃ , ZrO ₂ , Nb ₂ O ₅ , and TiO ₂ is 88 % or more, preferably the total content of SiO ₂ , B ₂ O ₃ , La ₂ O ₃ , Y ₂ O ₃ , ZrO ₂ , Nb ₂ O ₅ , and TiO ₂ is 90% or more, and more preferably SiO ₂ , B ₂ O ₃ , The total content of La ₂ O ₃ , Y ₂ O ₃ , ZrO ₂ , Nb ₂ O ₅ , and TiO ₂ is 92% or more, and SiO ₂ , B ₂ O ₃ , La ₂ O ₃ , Y ₂ O ₃ , and ZrO ₂ are more preferred. The total content of , Nb ₂ O ₅ and TiO ₂ is more than 95%.

Furthermore, the optical glass does not contain Ta ₂ O ₅ , and/or does not contain Yb ₂ O ₃ , 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 , and/or does not contain GeO ₂ , and RO is one or more of MgO, CaO, SrO, and BaO, and Rn ₂ O is one or more of Li ₂ O, Na ₂ O, and K ₂ O.

Further, the refractive index n _d of the optical glass is 1.92 to 1.98, preferably 1.93 to 1.97, more preferably 1.94 to 1.96, and the Abbe number v _d is 29 to 36, preferably 30 to 35, more preferably 31～34.

Further, the density ρ of the optical glass is 5.10g/cm ³ or less, preferably 5.00g/cm ³ or less, more preferably 4.95g/cm ³ or less; and/or the thermal expansion coefficient α _{-30/70 °C} is 85×10 ^-7 /K or less, preferably 80×10 ^-7 /K or less, more preferably 75×10 ^-7 /K or less, further preferably 70×10 ^-7 /K or less; and/or the water resistance is stable The property D _W is type 2 or more, preferably type 1; and/or the acid resistance stability D _A is type 2 or more, preferably type 1; and/or λ ₇₀ is 425 nm or less, preferably λ ₇₀ is 420 nm or less, more preferably λ ₇₀ is 415 nm or less; and/or λ ₅ is 375 nm or less, preferably λ ₅ is 370 nm or less, more preferably λ ₅ is 365 nm or less; and/or the weather resistance CR is Category 2 or more, preferably Category 1; and/or The hardness H _K is 650×10 ⁷ Pa or above, preferably 660×10 ⁷ Pa or above, more preferably 670×10 ⁷ Pa or above, further preferably 680×10 ⁷ Pa or above; and/or Young’s modulus E is 11000×10 ⁷ Pa～15000×10 ⁷ Pa, preferably 11500×10 ⁷ Pa～14500×10 ⁷ Pa, more preferably 12000×10 ⁷ Pa～14000×10 ⁷ Pa, even more preferably 12500×10 ⁷ Pa～ 13500×10 ⁷ Pa; and/or the bubble degree is A level or above, preferably A ₀ level or above, more preferably A ₀₀ level; and/or the abrasion degree F _A is 80 to 130, preferably 90 to 120, more preferably It is 95~115.

A glass prefabricated part is made of the above-mentioned optical glass.

An optical element is made of the above-mentioned optical glass or the above-mentioned glass preform.

An optical instrument contains the above-mentioned optical glass, and/or contains the above-mentioned optical element.

The beneficial effects of the present invention are: through reasonable component design, the present invention can obtain optical glass with excellent devitrification resistance at lower raw material costs.

The following is a detailed description of the implementation of the optical glass of the present invention, but the present invention is not limited to the following implementation, and can be implemented with appropriate changes within the scope of the purpose of the present invention. In addition, although there are appropriate omissions of the repeated description, the main purpose of the invention will not be limited by this. In the following content, the optical glass of the present invention is sometimes referred to as glass.

[Optical glass]

The following describes the range of each component (ingredient) of the optical glass of the present invention. In the present invention, unless otherwise specified, the content and total content of each component are all expressed in weight percentage (wt%), that is, the content and total content of each component are relative to the total content of the glass material converted into an oxide composition. Amount expressed as weight percent. Here, the "composition converted into oxides" refers to the case where oxides, complex salts, hydroxides, etc. used as raw materials for the optical glass composition of the present invention are decomposed and converted into oxides when melted. , taking the total amount of the oxide as 100%.

Unless otherwise specified under specific circumstances, the numerical ranges listed in the present invention include upper and lower limits, "above" and "below" include the endpoint values, and include all integers and fractions within the range, and are not limited to the specific values listed when defining the range. The term "and/or" herein is inclusive, for example, "A and/or B" means only A, or only B, or both A and B.

＜Required and optional components＞

_B2O3 in the present invention is a network-forming component that can improve the thermal stability of glass and enhance the solubility of glass. In the present invention, the above-mentioned effects are obtained by containing 5% or _more of _B2O3 . Preferably, _the content of _B2O3 is 6% or more, and more preferably _, the content of _B2O3 is 7% or more. When the content of _B2O3 is too much, the refractive index of the _glass decreases and the chemical stability deteriorates. Therefore, in the present invention _, the upper limit _{of the content of B2O3 is} 18%, preferably 14%, and more preferably 12%.

_SiO2 has the effect of improving the chemical stability of glass, maintaining the viscosity suitable for molten glass molding, and reducing the corrosion of refractory materials. If its content is too high, the melting difficulty of glass increases, and it is not conducive to reducing the transition temperature of glass. Therefore, the content of _SiO2 in the present invention is 1-12%, preferably 2-10%, and more preferably 4-9%.

In some embodiments, by controlling the total content of _SiO2 and _{B2O3 , SiO2} + _{B2O3 ,} within the range _of 8-28%, the glass stability can be maintained while optimizing the abrasion _{resistance and} weather resistance of the glass and preventing the glass from losing clarity. Therefore _{, SiO2} + _B2O3 is preferably 8-28% _, more preferably 10-25%, _and further preferably _12-20 %.

La ₂ O ₃ is an active ingredient that increases the refractive index of glass and has a significant effect on improving the chemical stability and devitrification resistance of glass. If its content is less than 40%, it is difficult to achieve the required optical constants; if its content is more than 60%, On the contrary, the devitrification tendency of the glass increases and the thermal stability becomes worse. Therefore, the content of La ₂ O ₃ is limited to 40 to 60%, preferably 43 to 58%, and more preferably 46 to 53%.

_Y2O3 can improve the refractive index and devitrification resistance of glass and adjust the Young's modulus of glass _. The present invention achieves the above effects by containing 4% or more of _Y2O3 . If the content exceeds 20%, the chemical stability and weather resistance of the _glass will deteriorate. Therefore, the content _{of Y2O3 in} the present invention is 4-20%, preferably 5-15%, and more preferably 6-12%.

In some embodiments, the ratio of the content of Y ₂ O ₃ to the content of B ₂ O ₃ , Y ₂ O ₃ /B ₂ O _3, is controlled within the range of 0.4 to 3.0, which is beneficial for the glass to obtain an appropriate Young's modulus. Therefore, Y ₂ O ₃ /B ₂ O ₃ is preferably 0.4 to 3.0, and more preferably Y ₂ O ₃ /B ₂ O ₃ is 0.5 to 2.5. Furthermore, by controlling Y ₂ O ₃ /B ₂ O ₃ within the range of 0.6 to 1.5, it is beneficial to further reduce the thermal expansion coefficient of the glass and optimize the bubble degree of the glass. Therefore, it is further preferred that Y ₂ O ₃ /B ₂ O ₃ is 0.6 to 1.5, and it is further preferred that Y ₂ O ₃ /B ₂ O ₃ is 0.7 to 1.2.

Gd ₂ O ₃ can improve the refractive index and chemical stability of glass, but if its content is too high, the devitrification resistance and abrasion resistance of the glass will become worse, and the cost of the glass will increase. Therefore, the content of Gd ₂ O ₃ is 0 to 9%, preferably 0 to 5%, more preferably 0 to 3%, even more preferably 0 to 1%.

In some embodiments, by controlling the total content of La ₂ O ₃ , Y ₂ O ₃ and Gd ₂ O ₃ (La ₂ O ₃ +Y ₂ O ₃ +Gd ₂ O ₃ ) within the range of 46 to 70%, the glass can more easily obtain a desired refractive index and Abbe number, and the devitrification resistance and weather resistance of the glass are optimized. Therefore, La ₂ O ₃ +Y ₂ O ₃ +Gd ₂ O ₃ is preferably 46 to 70%, more preferably La ₂ O ₃ +Y ₂ O ₃ +Gd ₂ O ₃ is 50 to 68%, and further preferably La ₂ O ₃ +Y ₂ O ₃ +Gd ₂ O ₃ is 55 to 65%.

Yb ₂ O ₃ is also a component that gives glass high refractive and low dispersion properties. If its content exceeds 10%, the anti-crystallization properties of the glass will decrease. Therefore, the content of Yb ₂ O ₃ is 0 to 10%, preferably 0 to 5%, more preferably 0 to 1%, and further preferably does not contain Yb ₂ O ₃ .

ZrO ₂ can improve the viscosity, hardness, refractive index and chemical stability of optical glass, and can also reduce the thermal expansion coefficient of the glass; when the content of ZrO ₂ is too high, the devitrification resistance of the glass decreases, the melting difficulty increases, and the melting temperature rises , and lead to inclusions inside the glass and a decrease in light transmittance. Therefore, the content of ZrO ₂ in the present invention is 1 to 12%, preferably 3 to 10%, and more preferably 4 to 9%.

_TiO2 is a high-refractive and high-dispersion component. It can significantly improve the refractive index and dispersion of glass. The inventors have found that a proper amount of _TiO2 can increase the stability of glass; but if too much _TiO2 is contained, the transmittance of the glass will be significantly reduced and the chemical stability of the glass will also tend to deteriorate. Therefore, the content of _TiO2 in the present invention is 4-18%, preferably 5-13%, and more preferably 6-12%.

In some embodiments, controlling the ratio TiO ₂ /Y ₂ O ₃ between the content of TiO ₂ and the content of Y ₂ O ₃ in the range of 0.3 to 4.0 can optimize the abrasion and weather resistance of the glass. Therefore, it is preferable that TiO ₂ /Y ₂ O ₃ is 0.3 to 4.0, and it is more preferable that TiO ₂ /Y ₂ O ₃ is 0.5 to 3.0. Furthermore, controlling TiO ₂ /Y ₂ O ₃ in the range of 0.6 to 2.0 can further improve the chemical stability and bubble degree of the glass. Therefore, it is more preferable that TiO ₂ /Y ₂ O ₃ is 0.6 to 2.0, and it is even more preferable that TiO ₂ /Y ₂ O ₃ is 0.75 to 1.5.

Nb ₂ O ₅ is a high refractive and high dispersion component, which can improve the refractive index and devitrification resistance of glass and reduce the thermal expansion coefficient of glass. In the present invention, the above effect is achieved by containing more than 4% of Nb ₂ O _5. Nb is preferred The lower limit of the content of ₂ O ₅ is 5%, and a more preferable lower limit is 7%. If the content of Nb ₂ O ₅ exceeds 20%, the thermal stability and weather resistance of the glass will be reduced, and the light transmittance will decrease. Therefore, the upper limit of the content of Nb ₂ O ₅ in the present invention is 20%, the preferred upper limit is 15%, and the more preferred upper limit is 15%. is 12%.

In some embodiments, the ratio of La ₂ O ₃ to the total content of TiO ₂ and Nb ₂ O ₅ , La ₂ O ₃ / (TiO ₂ + Nb ₂ O ₅ ), is controlled within the range of 1.2 to 6.0, which is beneficial to improving the Young's modulus of the glass and preventing the light transmittance of the glass from decreasing. Therefore, La ₂ O ₃ / (TiO ₂ + Nb ₂ O ₅ ) is preferably 1.2 to 6.0, and La ₂ O ₃ / (TiO ₂ + Nb ₂ O ₅ ) is more preferably 1.5 to 5.0. Furthermore, controlling La ₂ O ₃ / (TiO ₂ + Nb ₂ O ₅ ) within the range of 2.0 to 4.0 can further reduce the density and thermal expansion coefficient of the glass. Therefore, La ₂ O ₃ /(TiO ₂ +Nb _{2 O 5} ) is more preferably 2.0 to 4.0, _{and further} preferably 2.5 to _{3.5 .}

Alkaline earth metal oxide RO (RO is one or more of MgO, CaO, SrO, BaO) can adjust the optical constants of glass and optimize the chemical stability of glass, but when its content is high, the devitrification resistance of glass decreases. Therefore, the RO content is limited to 0-9%, preferably 0-4%, and more preferably 0-2%. In some embodiments, it is further preferred that RO is not contained.

Alkali metal oxide Rn ₂ O (Rn ₂ O is one or more of Li ₂ O, Na ₂ O, K ₂ O) can reduce the transition temperature of glass, adjust the optical constants and high-temperature viscosity of glass, and improve the meltability of glass , but when its content is high, the devitrification resistance and chemical stability of the glass decrease. Therefore, the content of Rn ₂ O in the present invention is 0 to 6%, preferably 0 to 4%, and more preferably 0 to 1%. In some embodiments, it is further preferred not to contain Rn ₂ O.

WO ₃ can improve the refractive index and mechanical strength of glass. If the content of WO ₃ exceeds 6%, the thermal stability of glass decreases and the resistance to devitrification decreases. Therefore, the content of WO ₃ is 0-6%, preferably 0-4%, and more preferably 0.5-3%.

In some embodiments, controlling the ratio WO ₃ /Y ₂ O ₃ between the content of WO ₃ and the content of Y ₂ O ₃ below 0.8 is beneficial to improving the chemical stability and crystallization resistance of the glass. Therefore, it is preferable that WO ₃ /Y ₂ O ₃ is 0.8 or less, and more preferably WO ₃ /Y ₂ O ₃ is 0.6 or less. Furthermore, by controlling WO ₃ /Y ₂ O ₃ in the range of 0.02 to 0.5, the hardness and bubble degree of the glass can be further optimized. Therefore, it is more preferable that WO ₃ /Y ₂ O ₃ is 0.02 to 0.5, and even more preferably WO ₃ /Y ₂ O ₃ is 0.05 to 0.3.

In some embodiments, the ratio TiO2/(Nb2O5+WO3) between the content of TiO2 and the total content of Nb2O5 and WO3, Nb2O5+WO3, is controlled in the range of 0.3 to 3.0, which can reduce the density of the glass while preventing the glass from The light transmittance is reduced. Therefore, it is preferable that TiO ₂ /(Nb ₂ O ₅ +WO ₃ ) is 0.3 to 3.0, and it is more preferable that TiO ₂ /(Nb ₂ O ₅ +WO ₃ ) is 0.4 to 2.0. Furthermore, by controlling TiO ₂ /(Nb ₂ O ₅ +WO ₃ ) in the range of 0.6 to 1.5, the Young's modulus and weather resistance of the glass can be further optimized. Therefore, it is more preferable that TiO ₂ /(Nb ₂ O ₅ +WO ₃ ) is 0.6 to 1.5, and still more preferably, TiO ₂ /(Nb ₂ O ₅ +WO ₃ ) is 0.8 to 1.3.

ZnO can adjust the refractive index and dispersion of glass, and reduce the high temperature viscosity and transition temperature of glass. If the content of ZnO is too high, the difficulty of glass molding increases and the anti-crystallization performance deteriorates. Therefore, the content of ZnO is 0-8%, preferably 0-4%, and more preferably 0-2%. In some embodiments, it is further preferred that ZnO is not contained.

In some embodiments, the ratio ZnO/(SiO ₂ +B ₂ O ₃ ) between the content of ZnO and the total content of SiO ₂ and B ₂ O ₃ SiO ₂ +B ₂ O ₃ can be controlled below 0.5, which can be improved. The meltability of glass improves the degree of bubbles and optimizes abrasion. Therefore, it is preferable that ZnO/(SiO ₂ +B ₂ O ₃ ) is 0.5 or less, more preferably ZnO/(SiO ₂ +B ₂ O ₃ ) is 0.3 or less, and even more preferably ZnO/(SiO ₂ +B ₂ O ₃ ) is 0.2 Hereinafter, it is further preferred that ZnO/(SiO ₂ +B ₂ O ₃ ) is 0.1 or less.

In some embodiments, the ratio _of the total content of _B2O3 and _{TiO2 (B2O3 +} TiO2 ₎ to the total content of _SiO2 and ZnO ( _SiO2 +ZnO) ( _B2O3 + _TiO2 )/( _SiO2 +ZnO) is controlled within the range of 1.0 to 10.0, which can improve the chemical stability of the glass and prevent the glass light transmittance from decreasing. Therefore, it is preferred that ( _B2O3 + _TiO2 )/( _SiO2 +ZnO) is 1.0 _{to 10.0, and more preferably (B2O3 + TiO2} )/( _SiO2 +ZnO) is 1.0 _to 8.0 _. Furthermore, by controlling (B ₂ O ₃ +TiO ₂ )/(SiO ₂ +ZnO) within the range of 1.5 to 7.0, the hardness of the glass can be further increased and the thermal expansion coefficient of the glass can be reduced. Therefore, it is more preferred that (B ₂ O ₃ +TiO ₂ )/(SiO ₂ +ZnO) is 1.5 to 7.0, and it is even more preferred that (B ₂ O ₃ +TiO ₂ )/(SiO ₂ +ZnO) is 2.0 to 5.0.

In some embodiments, the ratio between the total content of Gd ₂ O ₃ and ZnO, Gd ₂ O ₃ + ZnO, and the content of Y ₂ O ₃ (Gd ₂ O ₃ + ZnO)/Y ₂ O ₃ is controlled at 1.0 The following can reduce the thermal expansion coefficient of glass and optimize the wear of glass. Therefore, (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is preferably 1.0 or less, and more preferably (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is 0.6 or less. Furthermore, controlling (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ below 0.3 can make it easier for the glass to obtain a suitable Young's modulus and prevent the glass hardness from decreasing. Therefore, it is more preferable that (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is 0.3 or less, and still more preferably (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is 0.1 or less.

Ta ₂ O ₅ has the function of increasing the refractive index and improving the devitrification resistance of glass. However, if its content is too high, the thermal stability of the glass will decrease and the density will increase. On the other hand, compared with other components, Ta ₂ O ₅ The price is very expensive, and from the perspective of practicality and cost, its use should be reduced as much as possible. Therefore, the content of Ta ₂ O ₅ in the present invention is limited to 0 to 8%, preferably 0 to 4%, and more preferably 0 to 2%. In some embodiments, it is further preferred not to contain Ta ₂ O ₅ .

In some embodiments, the ratio between the total content of Ta ₂ O ₅ and Gd ₂ O ₃ Ta ₂ O ₅ +Gd ₂ O ₃ and the content of Y ₂ O ₃ (Ta ₂ O ₅ +Gd ₂ O ₃ ) /Y ₂ O ₃ is controlled below 1.0, which is beneficial to the glass to obtain appropriate abrasion, optimize the density and Young's modulus of the glass, and prevent the chemical stability of the glass from deteriorating. Therefore, (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is preferably 1.0 or less, more preferably (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is 0.6 or less, and still more preferably (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is 0.4 or less, and more preferably (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is 0.1 or less.

Al ₂ O ₃ can improve the chemical stability of glass, but when its content exceeds 5%, the meltability and light transmittance of the glass become worse. Therefore, the content of Al ₂ O ₃ in the present invention is 0 to 5%, preferably 0 to 3%, and more preferably 0 to 1%. In some embodiments, it is further preferred not to contain Al ₂ O ₃ .

GeO ₂ has the effect of increasing the refractive index and devitrification resistance, but if its content is too high, the chemical stability of the glass decreases; on the other hand, compared with other ingredients, GeO ₂ is very expensive, both in terms of practicality and cost. Considering the perspective, its usage should be reduced as much as possible. Therefore, the content of GeO ₂ in the present invention is limited to 0 to 5%, preferably 0 to 3%, more preferably 0 to 1%, and further preferably does not contain GeO ₂ .

In the present invention, by containing 0-2% of one or more of Sb ₂ O ₃ , SnO, SnO ₂ , and CeO ₂ as a clarifier, the clarification effect of the glass and the bubble degree of the glass can be improved. The content of the clarifier is preferably 0-1%, and more preferably 0-0.5%. Since the types and contents of the components of the optical glass of the present invention are reasonably designed and the bubble degree is excellent, it is further preferred in some embodiments that no clarifier is contained. When _{the Sb2O3} content exceeds 2%, the glass tends to have reduced clarification performance. At the same time, due to its strong oxidizing effect _, it promotes the corrosion of the platinum or platinum alloy container for melting glass and the deterioration of the molding mold. Therefore, the present invention preferably has an _Sb2O3 content of 0-2%, more preferably 0-1%, further preferably 0-0.5%, and further preferably does not contain _Sb2O3 . _{SnO and SnO2 can} also be used as clarifiers, but when their content exceeds 2%, the glass tends to be colored more, or when the glass is heated, softened, and molded again, Sn will become the starting point for the generation of crystal nuclei, resulting in a tendency to devitrification. Therefore, the content of _SnO2 in the present invention is preferably 0-2%, more preferably 0-1%, further preferably 0-0.5%, and further preferably does not contain _SnO2 ; the content of SnO is preferably 0-2%, more preferably 0-1%, further preferably 0-0.5%, and further preferably does not contain SnO. The role and content ratio of _CeO2 are consistent with those of _SnO2 , and its content is preferably 0-2%, more preferably 0-1%, further preferably 0-0.5%, and further preferably does not contain _CeO2 .

In some embodiments, in order to obtain lower thermal expansion coefficient and density, higher light transmittance and bubble level, and suitable abrasion degree and Young's modulus of the optical glass of the present invention, SiO ₂ and B ₂ O are preferred. _3. The total content of La ₂ O ₃ , Y ₂ O ₃ , ZrO ₂ , Nb ₂ O ₅ , and TiO ₂ is more than 88%, and more preferably SiO ₂ , B ₂ O ₃ , La ₂ O ₃ , Y ₂ O ₃ , The total content of ZrO ₂ , Nb ₂ O ₅ , and TiO ₂ is 90% or more, and more preferably the total content of SiO ₂ , B ₂ O ₃ , La ₂ O ₃ , Y ₂ O ₃ , ZrO ₂ , Nb ₂ O ₅ , and TiO ₂ The content is 92% or more, and more preferably the total content of SiO ₂ , B ₂ O ₃ , La ₂ O ₃ , Y ₂ O ₃ , ZrO ₂ , Nb ₂ O ₅ , and TiO ₂ is 95% or more.

＜Ingredients that should not be contained＞

In the glass of the present invention, oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo, even if contained in small amounts alone or in combination, will color the glass and produce absorption at specific wavelengths in the visible light region, thereby weakening the property of the present invention of improving the visible light transmittance. Therefore, it is preferred that the glass is substantially free of oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo, especially when the oxides are contained in small amounts alone or in combination.

The oxides of Th, Cd, Tl, Os, Be and Se have been used as hazardous chemicals in recent years, and their use has tended to be controlled. They are not only used in the manufacturing process of glass, but also in the processing process and the disposal after productization. Measures are required. Therefore, when attaching importance to the impact on the environment, it is preferable that they are not actually contained except for unavoidable mixing. As a result, the optical glass does not actually contain substances that pollute the environment. Therefore, the optical glass of the present invention can be manufactured, processed, and discarded without taking special 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.

"Does not contain" or "0%" described in this article means that the compound, molecule or element 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 the production of optical glass, there will be certain Some impurities or components that are not intentionally added may be contained in small or trace amounts in the final optical glass. This situation is also within the scope of protection of the patent of the present invention.

Next, the performance of the optical glass of the present invention will be described.

＜Refractive Index and Abbe Number＞

The refractive index (n _d ) and Abbe number (ν _d ) of optical glass are tested according to the method specified in GB/T 7962.1—2010.

In some embodiments, the lower limit of the refractive index (n _d ) of the optical glass of the present invention is 1.92, preferably the lower limit is 1.93, and more preferably the lower limit is 1.94.

In some embodiments, the upper limit of the refractive index (n _d ) of the optical glass of the present invention is 1.98, preferably the upper limit is 1.97, and more preferably the upper limit is 1.96.

In some embodiments, the lower limit of the Abbe number (ν _d ) of the optical glass of the present invention is 29, preferably 30, and more preferably 31.

In some embodiments, the upper limit of the Abbe number (ν _d ) of the optical glass of the present invention is 36, preferably the upper limit is 35, and more preferably the upper limit is 34.

＜Density＞

The density (ρ) of optical glass is tested according to the method specified in "GB/T7962.20-2010".

In some embodiments, the density (ρ) of the optical glass of the present invention is 5.10 g/cm ³ or less, preferably 5.00 g/cm ³ or less, and more preferably 4.95 g/cm ³ or less.

＜Thermal expansion coefficient＞

The thermal expansion coefficient of optical glass (α _{-30/70 ℃} ) is tested at -30 ~ 70 ℃ according to the method specified in GB/T7962.16-2010.

In some embodiments, the thermal expansion coefficient (α _{-30/70 ° C.} ) of the optical glass of the present invention is 85×10 ^-7 /K or less, preferably 80×10 ^-7 /K or less, more preferably 75×10 ^-7 /K or less, and further preferably 70×10 ^-7 /K or less.

＜Water resistance stability＞

The water resistance stability (D _W ) (powder method) of optical glass is tested according to the method specified in GB/T 17129.

In some embodiments, the water resistance stability (D _W ) of the optical glass of the present invention is Category 2 or above, preferably Category 1.

＜Acid resistance stability＞

The acid resistance stability ( _DA ) (powder method) of optical glass is tested according to the method specified in GB/T 17129.

In some embodiments, the acid resistance stability ( _DA ) of the optical glass of the present invention is Category 2 or above, preferably Category 1.

＜Coloration＞

The short-wave transmission spectral characteristics of the glass of the present invention are expressed by chromaticity (λ ₇₀ and λ ₅ ). λ ₇₀ refers to the wavelength corresponding to when the glass transmittance reaches 70%. The measurement of λ ₇₀ is to use a glass with a thickness of 10±0.1mm having two opposite planes parallel to each other and optically polished, measure the spectral transmittance in the wavelength range from 280nm to 700nm, and express the wavelength at which the transmittance is 70%. The so-called spectral transmittance or transmittance is the amount expressed by I _out /I _in when light with intensity I _in is incident vertically on the above-mentioned surface of the glass, passes through the glass and emits light with intensity I _out from one plane, and also includes the transmittance of surface reflection loss on the above-mentioned surface of the glass. The higher the refractive index of the glass, the greater the surface reflection loss. Therefore, in high refractive index glass, a small value of _λ70 means that the glass itself has little coloring and high light transmittance.

In some embodiments, the λ ₇₀ of the optical glass of the present invention is 425 nm or less, preferably the λ ₇₀ is 420 nm or less, and more preferably the λ ₇₀ is 415 nm or less.

In some embodiments, the λ ₅ of the optical glass of the present invention is 375 nm or less, preferably the λ ₅ is 370 nm or less, and more preferably the λ ₅ is 365 nm or less.

＜Weather resistance＞

The test method for the weather resistance (CR) of optical glass is as follows: Place the sample in a test chamber with a relative humidity of 90% and saturated water vapor environment, alternately cycle at 40-50°C every 1h, and cycle for 15 cycles. The weather resistance category is divided according to the turbidity change before and after the sample is placed. The weather resistance classification is shown in Table 1: [Table 1] Category 1 2 3 4 a b c Turbidity increase △H (%) <0.3 0.3～1.0 1.0～2.0 2.0～4.0 4.0～6.0 ≥6.0

In some embodiments, the weather resistance (CR) of the optical glass of the present invention is Category 2 or above, preferably Category 1.

＜Knoop hardness＞

The Knoop hardness (H _K ) of optical glass is tested according to the test method specified in "GB/T7962.18-2010".

In some embodiments, the Knoop hardness ( _HK ) of the optical glass of the present invention is 650×10 ⁷ Pa or above, preferably 660×10 ⁷ Pa or above, more preferably 670×10 ⁷ Pa or above, further preferably 680× 10 ⁷ Pa and above.

＜Young's modulus＞

Young's modulus (E) is measured by ultrasonic wave velocity and transverse wave velocity, and then calculated according to the following formula.

G=V _S ² ρ

In the formula: E is Young’s modulus, Pa;

G is the shear modulus, Pa;

V _T is the transverse wave velocity, m/s;

V _S is the longitudinal wave velocity, m/s;

ρ is the density of 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 11000×10 ⁷ Pa, the preferred lower limit is 11500×10 ⁷ Pa, the more preferred lower limit is 12000×10 ⁷ Pa, and the further preferred lower limit is 12500×10 ⁷ Pa.

In some embodiments, the upper limit of the Young's modulus (E) of the optical glass of the present invention is 15000×10 ⁷ Pa, the preferred upper limit is 14500×10 ⁷ Pa, the more preferred upper limit is 14000×10 7 Pa, and the further preferred upper limit is 14000×10 ⁷ Pa. 13500×10 ⁷ Pa.

＜Bubbling degree＞

The bubble content of optical glass is tested according to the method specified in GB/T7962.8-2010.

In some embodiments, the bubble degree of the optical glass of the present invention is level A or above, preferably level A ₀ or above, and more preferably level A ₀₀ .

＜Wear degree＞

The abrasion resistance ( _FA ) of optical glass refers to the ratio of the wear amount of the sample to the wear amount (volume) of the standard sample (H-K9 glass) under exactly the same conditions, multiplied by 100, and is expressed by the following formula:

F _A =V/V ₀ ×100=(W/ρ)/( W ₀ /ρ ₀ )×100

Where: V—volume wear of the sample being tested;

V ₀ —standard sample volume wear amount;

W—the amount of wear of the sample being tested;

W ₀ —standard sample quality wear amount;

ρ—density of the sample being tested;

ρ ₀ —density of standard sample.

In some embodiments, the lower limit of the degree of abrasion ( _FA ) of the optical glass of the present invention is 80, preferably the lower limit is 90, and more preferably the lower limit is 95.

In some embodiments, the upper limit of the abrasion degree ( _FA ) of the optical glass of the present invention is 130, the preferred upper limit is 120, and the more preferred upper limit is 115.

[Manufacturing method of optical glass]

The manufacturing method of the optical glass of the present invention is as follows: the glass of the present invention is produced using conventional raw materials and processes, including but not limited to oxides, hydroxides, complex salts (such as carbonates, nitrates, sulfates, etc.), boric acid, etc. as raw materials, and after mixing the materials according to conventional methods, the prepared furnace materials are put into a melting furnace (such as platinum or platinum alloy crucible) at 1200-1450°C for melting, and after clarification and homogenization, a homogeneous molten glass without bubbles and undissolved substances is obtained, and the molten glass is cast in a mold and annealed. The technical personnel in this field can appropriately select the raw materials, process methods and process parameters according to actual needs.

[Glass preforms and optical components]

A glass preform can be produced from the produced optical glass by direct drop molding, grinding, or hot press molding. That is, the molten optical glass can be directly drop molded into a glass precision preform, or the glass preform can be produced by mechanical processing such as grinding and lapping, or the glass preform can be produced by making a preform for press molding from the optical glass, hot press molding the preform, and then grinding the preform. It should be noted that the means for producing the glass preform are 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 it is particularly preferred to form a preform from the optical glass of the present invention and use the preform to perform re-hot pressing, precision stamping, etc. to produce optical elements such as lenses and prisms.

The glass preform and optical element of the present invention are both formed from the above-mentioned optical glass of the present invention. 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 lenses, prisms and other optical elements with high optical value.

Examples of lenses include various lenses having a spherical or aspherical lens surface, 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.

[Optical instruments]

The optical elements formed by the optical glass of the present invention can be used to produce optical instruments such as photographic equipment, photography equipment, projection equipment, display devices, vehicle-mounted equipment and monitoring equipment.

Embodiment

<Optical Glass Example>

In order to further clearly illustrate and illustrate the technical solutions of the present invention, the following non-limiting examples are provided.

This embodiment adopts the above optical glass manufacturing method to obtain optical glasses having the compositions shown in Tables 2 to 4. In addition, the properties of each glass were measured by the testing method described in the present invention, and the measurement results are shown in Tables 2 to 4. [Table 2] Example (wt%) 1# 2# 3# 4# 5# 6# 7# 8# SiO ₂ 3.54 6.33 10.24 8.26 7.45 2.68 11.25 5.26 _{B2O3 ​} 13.32 8.46 6.15 9.52 10.36 15.24 7.36 11.37 La ₂ O ₃ 48.7 53.23 45.63 43.15 45.86 44.42 45.93 42.45 _{Y2O3 ​} 5.62 4.33 10.1 17.24 15.25 6.88 6.27 5.35 _{Gd2O3 ​} 0 0.6 0 1 0 0 3.2 0 _{Yb2O3 ​} 0 0 0 0 0 0 0 0 ZrO ₂ 10.22 8.35 3.63 2.74 4.66 5.15 9.34 11 _{Nb2O5 ​} 7.14 8.93 15.5 10.3 5.35 13.47 4.85 9.06 _TiO2 10.36 6.27 8.25 5.34 7.27 9.16 8.36 11.25 Ta ₂ O ₅ 0 0.5 0 1.5 0 0 2 0 MgO 0 1 0 0 1.5 0 0 0 CaO 0 0 0 0.5 0 0 0 0 SrO 0 0 0 0 0 0 0 0 BaO 0 0 0 0 0 1 0 1 _Li2O 0 1 0 0 0 0 0 0 _Na2O 0 0 0 0 0.5 0 0 0 _K2O 0 0 0 0 0.5 0 0 0 WO ₃ 1 0 0.5 0.35 1.2 2 1.34 3.26 ZnO 0 0 0 0 0 0 0 0 Al ₂ O ₃ 0 1 0 0 0 0 0 0 _GeO2 0 0 0 0 0 0 0 0 _{Sb2O3 ​} 0.1 0 0 0.1 0 0 0 0 SnO 0 0 0 0 0 0 0 0 _SnO2 0 0 0 0 0.1 0 0.1 0 _CeO2 0 0 0 0 0 0 0 0 Total 100 100 100 100 100 100 100 100 La ₂ O ₃ +Y ₂ O ₃ +Gd ₂ O ₃ 54.32 58.16 55.73 61.39 61.11 51.3 55.4 47.8 SiO ₂ +B ₂ O ₃ 16.86 14.79 16.39 17.78 17.81 17.92 18.61 16.63 (B ₂ O ₃ +TiO ₂ )/(SiO ₂ +ZnO) 6.689 2.327 1.406 1.799 2.366 9.104 1.397 4.3 (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ 0 0.254 0 0.145 0 0 0.829 0 TiO ₂ /Y ₂ O ₃ 1.843 1.448 0.817 0.31 0.477 1.331 1.333 2.103 Y ₂ O ₃ /B ₂ O ₃ 0.422 0.512 1.642 1.811 1.472 0.451 0.852 0.471 La ₂ O ₃ / (TiO ₂ + Nb ₂ O ₅ ) 2.783 3.502 1.921 2.759 3.634 1.963 3.477 2.09 TiO ₂ / (Nb ₂ O ₅ + WO ₃ ) 1.273 0.702 0.516 0.501 1.11 0.592 1.351 0.913 ZnO/(SiO ₂ +B ₂ O ₃ ) 0 0 0 0 0 0 0 0 (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ 0 0.139 0 0.058 0 0 0.51 0 WO ₃ /Y ₂ O ₃ 0.178 0 0.05 0.02 0.079 0.291 0.214 0.609 n _d 1.9626 1.9532 1.9757 1.9428 1.9362 1.9531 1.9256 1.9703 ν _d 31.76 32.34 29.43 33.75 35.63 29.84 35.37 30.29 D _W Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 D _A Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 CR Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 _HK (×10 ⁷ Pa) 680 681 677 675 684 678 674 678 F _A 94 104 98 91 92 105 118 103 E (×10 ⁷ Pa) 12875 12674 12374 12488 12945 12530 12265 12893 ρ（g/cm ³ ） 4.93 4.95 5.04 4.95 4.96 5.03 4.96 4.97 λ ₇₀ (nm) 411 414 420 417 413 419 415 413 λ ₅ (nm) 362 365 369 366 362 370 365 363 Bubble degree (level) A ₀₀ A ₀ A ₀₀ A ₀ A ₀₀ A ₀₀ A ₀₀ A ₀ α _-30/70℃ (×10 ^-7 /K) 75 74 76 75 74 78 75 73 [table 3] Example (wt%) 9# 10# 11# 12# 13# 14# 15# 16# SiO ₂ 6.74 7.32 4.47 6.28 5.39 4.58 6.56 5.44 _{B2O3 ​} 12.52 9.35 9.62 10.54 11.12 11.65 10.53 8.86 La ₂ O ₃ 43.2 50.16 47.79 45.69 49.18 49 46.6 48.36 _{Y2O3 ​} 6 10.25 11.37 8.65 9.27 8.34 7.62 8.37 _{Gd2O3 ​} 1.5 0 0 2.4 0 0 0 0 _{Yb2O3 ​} 0 0 0 0 0 0 0 0 ZrO ₂ 5.63 6.62 6.58 7.31 6.33 5.27 5.64 6.17 _{Nb2O5 ​} 6.17 8.35 8.27 9.15 9.33 9.46 10.04 11.32 _TiO2 15.34 7.45 8.28 8.14 8.64 10.12 9.55 9.28 Ta ₂ O ₅ 1 0 0 0 0 0 0 0 MgO 0 0 0 0 0 0 0 0 CaO 0 0 0 0 0 0 0 0 SrO 0 0 0 0 0 0 0 0 BaO 0.5 0 2 0 0 0 0 0 _Li2O 0 0 0 0 0 0 0 0 _Na2O 0 0 0 0 0 0 0 0 _K2O 0 0 0 0 0 0 0 0 WO ₃ 1.4 0 1.62 0.84 0.63 1.58 1.46 2.2 ZnO 0 0.5 0 1 0 0 2 0 Al ₂ O ₃ 0 0 0 0 0 0 0 0 _GeO2 0 0 0 0 0 0 0 0 _{Sb2O3 ​} 0 0 0 0 0.11 0 0 0 SnO 0 0 0 0 0 0 0 0 _SnO2 0 0 0 0 0 0 0 0 _CeO2 0 0 0 0 0 0 0 0 Total 100 100 100 100 100 100 100 100 La ₂ O ₃ +Y ₂ O ₃ +Gd ₂ O ₃ 50.7 60.41 59.16 56.74 58.45 57.34 54.22 56.73 SiO ₂ +B ₂ O ₃ 19.26 16.67 14.09 16.82 16.51 16.23 17.09 14.3 (B ₂ O ₃ +TiO ₂ )/(SiO ₂ +ZnO) 4.134 2.148 4.004 2.566 3.666 4.753 2.346 3.335 (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ 0.417 0 0 0.277 0 0 0 0 TiO ₂ /Y ₂ O ₃ 2.557 0.727 0.728 0.941 0.932 1.213 1.253 1.109 Y ₂ O ₃ /B ₂ O ₃ 0.479 1.096 1.182 0.821 0.834 0.716 0.724 0.945 La ₂ O ₃ / (TiO ₂ + Nb ₂ O ₅ ) 2.008 3.175 2.888 2.643 2.737 2.503 2.379 2.348 TiO ₂ / (Nb ₂ O ₅ + WO ₃ ) 2.026 0.892 0.837 0.815 0.867 0.917 0.83 0.686 ZnO/(SiO ₂ +B ₂ O ₃ ) 0 0.03 0 0.059 0 0 0.117 0 (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ 0.25 0.049 0 0.393 0 0 0.262 0 WO ₃ /Y ₂ O ₃ 0.233 0 0.142 0.097 0.068 0.189 0.192 0.263 n _d 1.9722 1.9554 1.9483 1.9602 1.9576 1.9642 1.9546 1.9683 ν _d 30.28 32.15 34.64 31.55 32.52 32.06 32.61 31.78 D _W Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 D _A Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 CR Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 _HK (×10 ⁷ Pa) 687 690 685 682 691 688 687 684 F _A 89 115 115 114 102 101 106 107 E (×10 ⁷ Pa) 12286 12967 13021 12432 12988 12932 12894 13085 ρ（g/cm ³ ） 4.98 4.93 4.92 4.91 4.93 4.92 4.93 4.96 λ ₇₀ (nm) 416 410 408 407 410 411 409 413 λ ₅ (nm) 367 360 357 357 361 360 358 362 Bubble degree (level) A ₀ A ₀ A ₀₀ A ₀₀ A ₀₀ A ₀₀ A ₀₀ A ₀₀ α _-30/70℃ (×10 ^-7 /K) 72 70 68 73 67 69 74 72 [Table 4] Example (wt%) 17# 18# 19# 20# twenty one# twenty two# twenty three# twenty four# SiO ₂ 5.82 7.06 7.68 8.54 6.83 6.46 7.15 5.62 _{B2O3 ​} 7.23 10.28 11.46 9.63 8.26 9.73 11.05 10.36 La ₂ O ₃ 48.06 48.93 46.49 48.04 49.88 45.33 54.58 50.41 _{Y2O3 ​} 8.16 9.33 6.45 7.62 10.1 8.55 5.26 9.15 _{Gd2O3 ​} 0 0 0 0 0 0 0 0 _{Yb2O3 ​} 0 0 0 0 0 0 0 0 ZrO ₂ 6.08 4.26 7.75 7.14 6.83 5.56 5.74 5.81 _{Nb2O5 ​} 8.82 8.34 9.18 8.75 8.62 12.14 7.66 8.08 _TiO2 12.33 10.08 9.34 8.83 8.52 7.86 7.53 8.47 Ta ₂ O ₅ 0 0 0 0 0 0 0 0 MgO 0 0 0 0 0 0 0 0 CaO 0 0 0 0 0 0 0 0 SrO 0 0 0 0 0 0 0 0 BaO 0 0 0 0 0 0 0 0 _Li2O 0 0 0 0 0 0 0 0 _Na2O 0 0 0 0 0 0 0 0 _K2O 0 0 0 0 0 0 0 0 WO ₃ 3.5 1.72 1.65 1.45 0.96 0.87 1.03 2.1 ZnO 0 0 0 0 0 3.5 0 0 Al ₂ O ₃ 0 0 0 0 0 0 0 0 _GeO2 0 0 0 0 0 0 0 0 _{Sb2O3 ​} 0 0 0 0 0 0 0 0 SnO 0 0 0 0 0 0 0 0 _SnO2 0 0 0 0 0 0 0 0 _CeO2 0 0 0 0 0 0 0 0 Total 100 100 100 100 100 100 100 100 La ₂ O ₃ +Y ₂ O ₃ +Gd ₂ O ₃ 56.22 58.26 52.94 55.66 59.98 53.88 59.84 59.56 SiO ₂ +B ₂ O ₃ 13.05 17.34 19.14 18.17 15.09 16.19 18.2 15.98 (B ₂ O ₃ +TiO ₂ )/(SiO ₂ +ZnO) 3.361 2.884 2.708 2.162 2.457 1.766 2.599 3.351 (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ 0 0 0 0 0 0 0 0 TiO ₂ /Y ₂ O ₃ 1.511 1.08 1.448 1.159 0.844 0.919 1.432 0.926 Y ₂ O ₃ /B ₂ O ₃ 1.129 0.908 0.563 0.791 1.223 0.879 0.476 0.883 La ₂ O ₃ / (TiO ₂ + Nb ₂ O ₅ ) 2.272 2.656 2.51 2.733 2.91 2.267 3.593 3.046 TiO ₂ / (Nb ₂ O ₅ + WO ₃ ) 1.001 1.002 0.862 0.866 0.889 0.604 0.867 0.832 ZnO/(SiO ₂ +B ₂ O ₃ ) 0 0 0 0 0 0.216 0 0 (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ 0 0 0 0 0 0.409 0 0 WO ₃ /Y ₂ O ₃ 0.429 0.184 0.256 0.19 0.095 0.102 0.196 0.23 n _d 1.9654 1.9533 1.9537 1.9542 1.9623 1.9545 1.9528 1.9541 ν _d 32.05 32.44 32.57 31.85 32.66 32.27 31.83 32.65 D _W Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 D _A Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 CR Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 _HK (×10 ⁷ Pa) 683 689 685 687 690 678 692 684 F _A 98 110 109 105 103 117 104 105 E (×10 ⁷ Pa) 13120 12953 12894 13015 13124 12428 12957 12938 ρ（g/cm ³ ） 4.91 4.90 4.92 4.91 4.93 4.95 4.95 4.91 λ ₇₀ (nm) 410 411 408 410 411 414 413 410 λ ₅ (nm) 360 360 358 362 360 364 363 360 Bubble degree (level) A ₀₀ A ₀₀ A ₀₀ A ₀₀ A ₀₀ A ₀₀ A ₀₀ A ₀₀ α _-30/70℃ (×10 ^-7 /K) 72 67 70 65 66 70 64 67

＜Glass prefabricated part example＞

The glass obtained in Optical Glass Examples 1 to 24# is used to produce concave meniscus lenses, convex meniscus lenses, double meniscus lenses, etc. Prefabricated parts for various lenses, prisms, etc., including convex lens, biconcave lens, plano-convex lens, plano-concave lens, etc.

<Optical Element Example>

The preforms obtained in the above glass preform embodiments are annealed to reduce the internal stress of the glass while fine-tuning the refractive index so that the refractive index and other optical properties reach required values.

Next, each preform is ground and ground to produce various lenses and prisms such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. The surface of the obtained optical element can also be coated with an anti-reflective film.

<Optical Instrument Example>

The optical elements produced by the above optical element embodiments can be used in, for example, imaging equipment, sensors, microscopes, medical technology, digital projection, communications, etc. by using one or more optical elements to form optical components or optical elements through optical design. Optical communication technology/information transmission, optics/illumination in the automotive field, photolithography technology, excimer lasers, chips, computer chips, and integrated circuits and electronic devices including such circuits and chips.

Claims (19)

An optical glass, wherein its components are expressed in weight percentage, containing: SiO ₂ : 1 to 12%; B ₂ O ₃ : 5 to 18%; La ₂ O ₃ : 40 to 60%; Y ₂ O ₃ : 4 ~20%; ZrO ₂ : 1 ~ 12%; Nb ₂ O ₅ : 4 ~ 20%; TiO ₂ : 4 ~ 18%. The optical glass as described in claim 1, wherein its components are expressed in weight percentage, and also contain: Gd ₂ O ₃ : 0 to 9%; and/or Ta ₂ O ₅ : 0 to 8%; and/or RO : 0～9%; and/or Rn ₂ O: 0～6%; and/or WO ₃ : 0～6%; and/or ZnO: 0～8%; and/or Al ₂ O ₃ : 0～5 %; and/or Yb ₂ O ₃ : 0 to 10%; and/or GeO ₂ : 0 to 5%; and/or clarifier: 0 to 2%, and the RO is MgO, CaO, SrO, and BaO. One or more, Rn ₂ O is one or more of Li ₂ O, Na ₂ O, K ₂ O, and the clarifying agent is one or more of Sb ₂ O ₃ , SnO, SnO ₂ , CeO ₂ . An optical glass, wherein the components thereof are expressed in weight percentage and are composed of SiO ₂ : 1-12%; B ₂ O ₃ : 5-18%; La ₂ O ₃ : 40-60%; Y ₂ O ₃ : 4-20%; ZrO ₂ : 1-12%; Nb ₂ O ₅ : 4-20%; TiO ₂ : 4-18%; Gd ₂ O ₃ : 0-9%; Ta ₂ O ₅ : 0-8%; RO : 0-9%; Rn ₂ O : 0-6%; WO ₃ : 0-6%; ZnO : 0-8%; Al ₂ O ₃ : 0-5%; Yb ₂ O ₃ : 0-10%; GeO ₂ : 0-5%; and a clarifier: 0-2%, wherein RO is one or more of MgO, CaO, SrO, and BaO, and Rn ₂ O is Li ₂ O, Na ₂ O, K ₂ O, and the clarifier is one or more of Sb ₂ O ₃ , SnO, SnO ₂ , and CeO ₂ . The optical glass as claimed in any one of claims 1 to 3, wherein the composition thereof, expressed in weight percentage, satisfies one or more of the following 11 conditions: 1) La ₂ O ₃ +Y ₂ O ₃ +Gd ₂ O ₃ is 46 to 70%; 2) SiO ₂ +B ₂ O ₃ is 8 to 28%; 3) (B ₂ O ₃ +TiO ₂ )/(SiO ₂ +ZnO) is 1.0 to 10.0; 4) (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is 1.0 or less; 5) TiO ₂ /Y ₂ O ₃ is 0.3 to 4.0; 6) Y ₂ O ₃ /B ₂ O ₃ is 0.4 to 3.0; 7) La ₂ O ₃ /(TiO ₂ +Nb ₂ O ₅ ) is 1.2 to 6.0; 8) TiO ₂ /(Nb ₂ O ₅ +WO ₃ ) is 0.3 to 3.0; 9) ZnO/(SiO ₂ +B ₂ O ₃ ) is 0.5 or less; 10) (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is 1.0 or less; 11) WO ₃ /Y ₂ O ₃ is 0.8 or less. The optical glass as described in any one of claims 1 to 3, wherein its components are expressed in weight percentage and satisfy one or more of the following 11 situations: 1) La ₂ O ₃ +Y ₂ O ₃ +Gd ₂ O ₃ is 50 to 68%; 2) SiO ₂ +B ₂ O ₃ is 10 to 25%; 3) (B ₂ O ₃ +TiO ₂ )/(SiO ₂ +ZnO) is 1.0 to 8.0; 4) ( Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is 0.6 or less; 5) TiO ₂ /Y ₂ O ₃ is 0.5 to 3.0; 6) Y ₂ O ₃ /B ₂ O ₃ is 0.5 to 2.5; 7 )La ₂ O ₃ /(TiO ₂ +Nb ₂ O ₅ ) is 1.5～5.0; 8)TiO ₂ /(Nb ₂ O ₅ +WO ₃ ) is 0.4～2.0; 9)ZnO/(SiO ₂ +B ₂ O ₃ ) is 0.3 or less; 10) (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is 0.6 or less; 11) WO ₃ /Y ₂ O ₃ is 0.6 or less. The optical glass as claimed in any one of claims 1 to 3, wherein the composition thereof, expressed in weight percentage, satisfies one or more of the following 11 conditions: 1) La ₂ O ₃ +Y ₂ O ₃ +Gd ₂ O ₃ is 55 to 65%; 2) SiO ₂ +B ₂ O ₃ is 12 to 20%; 3) (B ₂ O ₃ +TiO ₂ )/(SiO ₂ +ZnO) is 1.5 to 7.0; 4) (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is 0.4 or less; 5) TiO ₂ /Y ₂ O ₃ is 0.6 to 2.0; 6) Y ₂ O ₃ /B ₂ O ₃ is 0.6 to 1.5; 7) La ₂ O ₃ /(TiO ₂ +Nb ₂ O ₅ ) is 2.0 to 4.0; 8) TiO ₂ /(Nb ₂ O ₅ +WO ₃ ) is 0.6 to 1.5; 9) ZnO/(SiO ₂ +B ₂ O ₃ ) is less than 0.2; 10) (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is less than 0.3; 11) WO ₃ /Y ₂ O ₃ is 0.02 to 0.5. The optical glass as described in any one of claims 1 to 3, wherein its components are expressed in weight percentage and satisfy one or more of the following 9 situations: 1) (B ₂ O ₃ +TiO ₂ )/( SiO ₂ +ZnO) is 2.0 to 5.0; 2) (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is 0.1 or less; 3) TiO ₂ /Y ₂ O ₃ is 0.75 to 1.5; 4) Y ₂ O ₃ /B ₂ O ₃ is 0.7～1.2; 5) La ₂ O ₃ /(TiO ₂ +Nb ₂ O ₅ ) is 2.5～3.5; 6) TiO ₂ /(Nb ₂ O ₅ +WO ₃ ) is 0.8～ 1.3; 7) ZnO/(SiO ₂ +B ₂ O ₃ ) is 0.1 or less; 8) (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is 0.1 or less; 9) WO ₃ /Y ₂ O ₃ is 0.05～ 0.3. The optical glass according to any one of claims 1 to 3, wherein its components are expressed in weight percentage, wherein: SiO ₂ : 2 to 10%; and/or B ₂ O ₃ : 6 to 14%; and /or La ₂ O ₃ : 43 to 58%; and / or Y ₂ O ₃ : 5 to 15%; and / or ZrO ₂ : 3 to 10%; and / or Nb ₂ O ₅ : 5 to 15%; and /or Ta ₂ O ₅ : 0 ~ 4%; and / or Gd ₂ O ₃ : 0 ~ 5%; and / or TiO ₂ : 5 ~ 13%; and / or RO: 0 ~ 4%; and / or Rn ₂ O: 0 to 4%; and/or WO ₃ : 0 to 4%; and/or ZnO: 0 to 4%; and/or Al ₂ O ₃ : 0 to 3%; and/or Yb ₂ O ₃ : 0 to 5%; and/or GeO ₂ : 0 to 3%; and/or clarifier: 0 to 1%, the RO is one or more of MgO, CaO, SrO, and BaO, and Rn ₂ O is Li ₂ One or more of O, Na ₂ O, K ₂ O, and the clarifying agent is one or more of Sb ₂ O ₃ , SnO, SnO ₂ , and CeO ₂ . The optical glass as claimed in any one of claims 1 to 3, wherein the components thereof are expressed in weight percentage, wherein: SiO ₂ : 4-9%; and/or B ₂ O ₃ : 7-12%; and/or La ₂ O ₃ : 46-53%; and/or Y ₂ O ₃ : 6-12%; and/or ZrO ₂ : 4-9%; and/or Nb ₂ O ₅ : 7-12%; and/or Ta ₂ O ₅ : 0-2%; and/or Gd ₂ O ₃ : 0-1%; and/or TiO ₂ : 6-12%; and/or RO : 0-2%; and/or Rn ₂ O : 0-1%; and/or WO ₃ : 0.5-3%; and/or ZnO : 0-2%; and/or Al ₂ O ₃ : 0-1%; and/or Yb ₂ O ₃ : 0-1%; and/or GeO ₂ : 0-1%; and/or clarifier: 0-0.5%, the RO is one or more of MgO, CaO, SrO, BaO, _Rn2O is one or more of _Li2O , _Na2O , _K2O , the clarifier is one or more of _Sb2O3 , _SnO , _SnO2 , _CeO2 . The optical glass according to any one of claims 1 to 3, wherein its components are expressed in weight percentage, SiO ₂ , B ₂ O ₃ , La ₂ O ₃ , Y ₂ O ₃ , ZrO ₂ , Nb ₂ O _5. The total content of TiO ₂ is more than 90%. The optical glass according to any one of claims 1 to 3, wherein the total content of _SiO2 , _{B2O3 , La2O3} , _{Y2O3 , ZrO2} , _Nb2O5 and _TiO2 is ₉₅ % _or more in terms of weight percentage. The optical glass as described in any one of claims ₁ to 3, wherein its composition does _not contain _Ta2O5 ; and/or does not contain _Yb2O3 ; and/or does not contain RO; and/or does not contain _Rn2O ; and/or does not contain ZnO; and/or does not contain _Al2O3 ; and/or does not contain _{GeO2 ,} wherein RO is one or more of MgO, CaO, SrO, and BaO, and _Rn2O is one or more of _Li2O , _Na2O , and _K2O . The optical glass according to any one of claims 1 to 3, wherein the refractive index n _d of the optical glass is 1.92 to 1.98, and the Abbe number v _d is 29 to 36. The optical glass according to any one of claims 1 to 3, wherein the refractive index n _d of the optical glass is 1.94 to 1.96, and the Abbe number v _d is 31 to 34. The optical glass according to any one of claims 1 to 3, wherein the density ρ of the optical glass is 5.10g/cm ³ or less; and/or the thermal expansion coefficient α _{-30/70 ℃} is 85×10 ^-7 /K or less; and/or water resistance stability D _W is category 2 or above; and/or acid resistance stability D _A is category 2 or above; and/or λ ₇₀ is below 425 nm; and/or λ ₅ is below 375 nm; and/or weather resistance CR is Category 2 or above; and/or Knoop hardness H _K is 650×10 ⁷ Pa or above; and/or Young’s modulus E is 11000×10 ⁷ Pa ~ 15000×10 ⁷ Pa; and/or Or the bubble degree is A level or above; and/or the abrasion degree F _A is 80 to 130. The optical glass as described in any one of claims 1 to 3, wherein the density ρ of the optical glass is 4.95 g/cm ³ or less; and/or the thermal expansion coefficient α _{-30/70 ℃} is 70×10 ^-7 /K or less; and/or the water resistance stability D _W is Class 1; and/or the acid resistance stability _DA is Class 1; and/or λ ₇₀ is 415 nm or less; and/or λ ₅ is 365 nm or less; and/or the weather resistance CR is Class 1; and/or the Knoop hardness H _K is 680×10 ⁷ Pa or more; and/or the Young's modulus E is 12500×10 ⁷ Pa to 13500×10 ⁷ Pa; and/or the bubble degree is A ₀₀ grade; and/or the abrasion resistance _FA is 95 to 115. A glass preform made of the optical glass as described in any one of claims 1 to 16. An optical element, wherein the optical element is made of the optical glass as described in any one of claims 1 to 16, or is made of the glass preform as described in claim 17. An optical instrument, comprising the optical glass as described in any one of claims 1 to 16, and/or the optical element as described in claim 18.