TW202417390A - Optical glass, glass preform, optical element, and optical instrument - Google Patents

Abstract

The present invention provides an optical glass, comprising the following components in percentage by weight: SiO2: 2-18%; B2O3: 8-22%; La2O3: 40-60%; Y2O3: 3-18%; ZrO2: 1-15%; and Nb2O5: 2-15%. By means of reasonable component design, the optical glass obtained in the present invention has excellent devitrification resistance and chemical stability.

Description

Optical glass, glass preforms, optical components and optical instruments

The present invention relates to an optical glass, in particular to an optical glass with a refractive index _nd of 1.82 to 1.89 and an Abbe number _vd of 37 to 44, and a glass preform, an optical element and an optical instrument made of the same.

Optical glass with a refractive index n _d of 1.82 to 1.89 and an Abbe number v _d of 37 to 44 belongs to high refractive index optical glass, and is a glass material used to manufacture lenses, prisms, reflectors and windows in optical instruments or mechanical systems, and is widely used. In the prior art, the devitrification resistance and chemical stability of optical glass with a refractive index n _d of 1.82 to 1.89 and an Abbe number v _d of 37 to 44 need to be improved, such as an optical glass with a refractive index n _d of 1.75 to 1.85 and an Abbe number v _d of 34 to 40 disclosed in CN110937802A, and an optical glass with a refractive index n _d of 1.80 to 1.90 and an Abbe number v _d of 30 to 40 disclosed in CN106810066A. Therefore, developing a high refractive index optical glass with excellent devitrification resistance and chemical stability is of great significance to the development of the optoelectronics field.

The technical problem to be solved by the present invention is to provide an optical glass with excellent devitrification resistance and chemical stability.

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 : 2-18%; B ₂ O ₃ : 8-22%; La ₂ O ₃ : 40-60%; Y ₂ O ₃ : 3-18%; ZrO ₂ : 1-15%; Nb ₂ O ₅ : 2-15%.

Furthermore, the optical glass, expressed in weight percentage, further comprises: Ta ₂ O ₅ : 0-10%; and/or Gd ₂ O ₃ : 0-9%; and/or TiO ₂ : 0-6%; and/or RO: 0-10%; and/or Rn ₂ O: 0-8%; and/or WO ₃ : 0-8%; and/or ZnO: 0-10%; and/or Al ₂ O ₃ : 0-5%; and/or Yb ₂ O ₃ : 0-8%; and/or GeO ₂ : 0-5%; and/or a clarifier: 0-1%, wherein 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 Sb ₂ O ₃ , SnO, SnO ₂ , CeO One or more of ₂ .

An optical glass, whose components are expressed in weight percentage, consists of _SiO2 : 2-18%; _B2O3 : 8-22%; La2O3: 40-60% _; Y2O3: 3-18%; _ZrO2 : 1-15%; _Nb2O5 : _2-15 %; Ta2O5: 0-10%; _{Gd2O3 : 0-9} % _{; TiO2} : _0-6 %; _RO : 0-10%; _Rn2O : _0-8 %; _WO3 : _0-8 %; ZnO: 0-10%; _{Al2O3 :} 0-5%; _{Yb2O3 :} 0-8%; _GeO2 : 0-5%; clarifier: 0-1%, wherein RO is one or more of MgO, CaO, SrO and BaO, _Rn2O is _Li2O , _Na2O , K ₂ O, and the clarifier 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: (ZnO+ _Ta2O5 )/ _Nb2O5 is less than _{2.0 ,} preferably (ZnO+ _Ta2O5 )/ _Nb2O5 is _less than _1.5 , more preferably (ZnO+ _Ta2O5 )/ _Nb2O5 is less than 1.0, _{and further} preferably ( _{ZnO+Ta2O5 )} / _Nb2O5 is _0.1-0.8 .

Furthermore, the optical glass has components expressed in weight percentage, wherein: (Gd ₂ O ₃ +Ta ₂ O ₅ +WO ₃ )/La ₂ O ₃ is less than 0.5, preferably (Gd ₂ O ₃ +Ta ₂ O ₅ +WO ₃ )/La ₂ O ₃ is less than 0.4, more preferably (Gd ₂ O ₃ +Ta ₂ O ₅ +WO ₃ )/La ₂ O ₃ is less than 0.3, and further preferably (Gd ₂ O ₃ +Ta ₂ O ₅ +WO ₃ )/La ₂ O ₃ is less than 0.2.

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 0.8, more preferably (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is less than 0.5, and further preferably (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is less than 0.2.

Furthermore, the optical glass has components expressed in weight percentage, wherein: _La2O3 /( _B2O3 + _{Nb2O5 )} is 1.2-5.0 _{, preferably La2O3} /( _B2O3 + _Nb2O5 ) is 1.3-4.0 _{, more} preferably _{La2O3 /} ( _{B2O3 +Nb2O5 )} is _1.5-3.5 , _and further preferably _La2O3 /( _B2O3 + _{Nb2O5 )} is _{1.7-2.7 .}

Furthermore, the optical glass has components expressed in weight percentage, wherein: (ZnO+WO ₃ )/Nb ₂ O ₅ is less than 3.0, preferably (ZnO+WO ₃ )/Nb ₂ O ₅ is less than 2.0, more preferably (ZnO+WO ₃ )/Nb ₂ O ₅ is less than 1.5, and further preferably (ZnO+WO ₃ )/Nb ₂ O ₅ is 0.2-1.0.

Furthermore, the optical glass has components expressed in weight percentage, wherein: (B ₂ O ₃ +RO)/La ₂ O ₃ is 0.15-0.7, preferably (B ₂ O ₃ +RO)/La ₂ O ₃ is 0.15-0.6, more preferably (B ₂ O ₃ +RO)/La ₂ O ₃ is 0.18-0.5, and further preferably (B ₂ O ₃ +RO)/La ₂ O ₃ is 0.2-0.4, and the RO is one or more of MgO, CaO, SrO, and BaO.

Furthermore, the optical glass has components expressed in weight percentage, wherein: (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is less than 2.0, preferably (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is less than 1.5, more preferably (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is less than 1.0, and further preferably (Gd ₂ O ₃ +ZnO)/Y ₂ O ₃ is less than 0.8.

Furthermore, the optical glass, wherein the components are expressed in weight percentage, wherein: SiO ₂ : 4-15%, preferably SiO ₂ : 6-12%; and/or B ₂ O ₃ : 10-20%, preferably B ₂ O ₃ : 12-18%; and/or La ₂ O ₃ : 43-55%, preferably La ₂ O ₃ : 46-52%; and/or Y ₂ O ₃ : 5-15%, preferably Y ₂ O ₃ : 7-13%; and/or ZrO ₂ : 2-12%, preferably ZrO ₂ : 3-10%; and/or Nb ₂ O ₅ : 3-13%, preferably Nb ₂ O ₅ : 5-11%; and/or Ta ₂ O ₅ : 0-5%, preferably Ta ₂ O ₅ : 0-2%; and/or Gd ₂ O ₃ : 0-5%, preferably Gd ₂ O ₃ : 0-2%; and/or TiO ₂ : 0-4%, preferably TiO ₂ : 0-2%; and/or RO: 0-5%, preferably RO: 0-2%; and/or Rn ₂ O: 0-4%, preferably Rn ₂ O: 0-2%; and/or WO ₃ : 0-6%, preferably WO ₃ : 0-4%; and/or ZnO: 1-8%, preferably ZnO: 2-7%; and/or Al ₂ O ₃ : 0-3%, preferably Al ₂ O ₃ : 0-1%; and/or Yb ₂ O ₃ : 0-3%, preferably Yb ₂ O ₃ : 0-1%; and/or GeO ₂ : 0-3%, preferably GeO ₂ : 0-1%; and/or clarifier: 0-0.5%, preferably clarifier: 0-0.2%, 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 .

Furthermore, the optical glass does not contain Ta ₂ O ₅ , and/or does not contain RO, and/or does not contain Rn ₂ O, and/or does not contain Gd ₂ O ₃ , and/or does not contain Yb ₂ O ₃ , and/or does not contain Al ₂ O ₃ , and/or does not contain GeO ₂ , and the 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.

Furthermore, the refractive index _nd of the optical glass is 1.82 to 1.89, preferably 1.83 to 1.88, more preferably 1.84 to 1.87, and the Abbe number _vd is 37 to 44, preferably 38 to 43, more preferably 39 to 42.

Further, the density ρ of the optical glass is 5.00 g/cm ³ or less, preferably 4.90 g/cm ³ or less, and more preferably 4.80 g/cm ³ or less; and/or the thermal expansion coefficient α _{-30/70 ℃} 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; and/or the water resistance stability D _W is 2 or more, preferably 1; and/or the acid resistance stability _DA is 2 or more, preferably 1; and/or λ ₇₀ is 400 nm or less, preferably λ ₇₀ is 395 nm or less, and more preferably λ ₇₀ is 390 nm or less; and/or λ ₅ is 350 nm or less, preferably λ ₅ is 345 nm or less, and more preferably λ 5 is 350 nm or less. ₅ is less than 340nm; and/or weather resistance CR is Class 2 or higher, preferably Class 1; and/or Knoop hardness H _K is 670×10 ⁷ Pa or higher, preferably 680×10 ⁷ Pa or higher, more preferably 690×10 ⁷ Pa or higher, further preferably 695×10 ⁷ Pa or higher; and/or Young's modulus E is 10500×10 ⁷ Pa or higher, preferably 11000×10 ⁷ Pa or higher, more preferably 11500×10 ⁷ Pa or higher; and/or abrasion degree _FA is 75-120, preferably 80-110, more preferably 86-105; and/or bubble degree is A grade or higher, preferably A ₀ grade or higher, more preferably A ₀₀ grade.

A glass preform is made of the above optical glass.

An optical element is made of the optical glass or the glass preform.

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

The beneficial effect of the present invention is that through reasonable component design, the optical glass obtained by the present invention has excellent resistance to devitrification and chemical stability.

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 is an explanation of 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 expressed in weight percentage relative to the total amount of glass material converted into oxide composition. Here, the "composition converted into oxide" means that when the oxides, complex salts, hydroxides, etc. used as raw materials for the optical glass composition of the present invention decompose and transform into oxides during melting, the total amount of the oxide material is taken 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＞

_SiO2 has the functions of adjusting optical constants, improving chemical stability of glass, maintaining viscosity suitable for molten glass, reducing abrasiveness and reducing corrosion to refractory materials. In the present invention, the above effects are obtained by containing more than 2% _SiO2 . Preferably, the content of _SiO2 is more than 4%, and more preferably, the content of _SiO2 is more than 6%. If the content of _SiO2 is too high, the melting difficulty of glass increases and the transition temperature rises. Therefore, in the present invention, the upper limit of the content of _SiO2 is 18%, preferably 15%, and more preferably 12%.

_B2O3 can improve the melting property and _{devitrification resistance of glass, and is beneficial to lowering the transition temperature of glass. The present invention obtains the above effects by containing 8% or more of B2O3 , preferably} 10% or more of _{B2O3 ,} and more preferably 12% or more of _B2O3 . If the content _{of B2O3} is too high, the chemical stability of the glass deteriorates, especially _the water resistance deteriorates, and the refractive index and light transmittance of the glass decrease. Therefore, the content _{of B2O3} is 22% or less, preferably 20% or less, and more preferably 18% or less.

_La2O3 is an effective component for increasing 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 the content is higher than 60%, the devitrification tendency of the glass increases and the thermal stability deteriorates. Therefore, the content of _La2O3 is limited to 40-60%, preferably 43-55%, and more preferably 46-52%.

_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 more than 3% _Y2O3 . If its content exceeds 18%, the chemical stability and weather resistance of _glass will deteriorate. Therefore, the content _{of Y2O3 in} the present invention is 3-18%, preferably 5-15%, and more preferably 7-13%.

_Gd2O3 can improve the refractive index and chemical stability of glass, but _if its content is higher than 9%, the devitrification resistance and abrasion resistance of glass will deteriorate. Therefore, the content _{of Gd2O3} is 0-9%, preferably 0-5%, and more preferably 0-2%. In some embodiments, it is further preferred _{that Gd2O3} is not contained.

_Yb2O3 is also a component that gives glass high refractive and low dispersion properties. If its content exceeds 8%, the anti-crystallization performance of the _glass decreases. Therefore, the content _{of Yb2O3} is 0-8%, preferably 0-3%, more preferably 0-1%, and more preferably _{no Yb2O3} is contained.

_ZrO2 can improve the viscosity, hardness, refractive index and chemical stability of optical glass, and can also reduce the thermal expansion coefficient of glass; when the content of _ZrO2 is too high, the resistance to devitrification of glass decreases, the melting difficulty increases, the melting temperature rises, and inclusions appear inside the glass and the light transmittance decreases. Therefore, the content of _ZrO2 in the present invention is 1-15%, preferably 2-12%, and more preferably 3-10%.

_TiO2 can increase the refractive index of glass, but too high a content will greatly reduce the dispersion coefficient and increase the tendency of crystallization, and even make the glass obviously colored. Therefore, the _TiO2 content is limited to 0-6%, preferably 0-4%, and more preferably 0-2%.

Ta ₂ O ₅ has the effect of increasing the refractive index and improving the devitrification resistance of glass. However, if its content is too high, the thermal stability of glass decreases, the density increases, and the optical constants are difficult to control within the desired range. On the other hand, compared with other components, Ta ₂ O ₅ is very expensive. From the perspective of practicality and cost, its usage should be reduced as much as possible. Therefore, in the present invention, the content of Ta ₂ O ₅ is limited to 0-10%, preferably 0-5%, more preferably 0-2%, and it is further preferred that Ta ₂ O ₅ is not contained.

In some embodiments, the ratio of the combined content of _{Ta2O5 and Gd2O3 (Ta2O5 + Gd2O3 )} to _{the content of Y2O3 ( (Ta2O5 + Gd2O3} ) _{/ Y2O3 )} is controlled below 1.0, which is beneficial for the glass to obtain appropriate abrasiveness, optimize the density and Young _'s modulus of the glass, and prevent the chemical stability of the glass from deteriorating. Therefore _, ( _Ta2O5 + _Gd2O3 )/ _Y2O3 is _{preferably 1.0 or less ,} more _preferably 0.8 _{or less ,} further preferably 0.5 _{or less , and still more preferably 0.2 or less .}

Nb ₂ O ₅ is a high-refractive and high-dispersion component that can increase the refractive index and devitrification resistance of glass and reduce the thermal expansion coefficient of glass. In the present invention, the above effects are obtained by containing more than 2% Nb ₂ O _5. The preferred lower limit of the content of Nb ₂ O ₅ is 3%, and the more preferred lower limit is 5%. If the content of Nb ₂ O ₅ exceeds 15%, the thermal stability and weather resistance of the glass will decrease, and the light transmittance will decrease. Therefore, in the present invention, the upper limit of the content of Nb ₂ O ₅ is 15%, the preferred upper limit is 13%, and the more preferred upper limit is 11%.

In some embodiments, the ratio of La ₂ O ₃ to the total content of B ₂ O ₃ and Nb ₂ O ₅ (B ₂ O ₃ +Nb ₂ O ₅ ) (La ₂ O ₃ /(B ₂ O ₃ +Nb ₂ O ₅ )) is controlled within the range of 1.2 to 5.0, which can increase the Young's modulus of the glass and the bubble degree of the glass. Therefore, La ₂ O ₃ /(B ₂ O ₃ +Nb ₂ O ₅ ) is preferably 1.2 to 5.0, and La ₂ O ₃ /(B ₂ O ₃ +Nb ₂ O ₅ ) is more preferably 1.3 to 4.0. Furthermore, La ₂ O ₃ /(B ₂ O ₃ +Nb ₂ O ₅ ) is controlled within the range of 1.5 to 3.5, which can further increase the hardness of the glass and reduce the thermal expansion coefficient of the glass. Therefore, La ₂ O ₃ /(B ₂ O ₃ +Nb ₂ O ₅ ) is more preferably 1.5 to 3.5, and even more preferably La ₂ O ₃ /(B ₂ O ₃ +Nb ₂ O ₅ ) is 1.7 to 2.7.

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 0-10%, preferably 0-5%, and more preferably 0-2%. In some embodiments, it is further preferred that RO is not contained.

In some embodiments, the ratio of the total content of B ₂ O ₃ and RO (B ₂ O ₃ +RO) to the content of La ₂ O ₃ ((B ₂ O ₃ +RO)/La ₂ O ₃₎ is controlled within the range of 0.15 to 0.7, which can improve the bubble degree and weather resistance of the glass. Therefore, it is preferred that (B ₂ O ₃ +RO)/La ₂ O ₃ is 0.15 to 0.7, and it is more preferred that (B ₂ O ₃ +RO)/La ₂ O ₃ is 0.15 to 0.6. Furthermore, by controlling (B ₂ O ₃ +RO)/La ₂ O ₃ within the range of 0.18 to 0.5, the hardness of the glass can be further improved and the thermal expansion coefficient of the glass can be optimized. Therefore, it is more preferable that (B ₂ O ₃ +RO)/La ₂ O ₃ is 0.18 to 0.5, and it is further more preferable that (B ₂ O ₃ +RO)/La ₂ O ₃ is 0.2 to 0.4.

Alkali metal oxide _Rn2O ( _Rn2O is one or more of _Li2O , _Na2O , _K2O ) can lower the transition temperature of glass, adjust the optical constants and high temperature viscosity of glass, and improve the melting property of glass. However, when the content of Rn2O is high, the devitrification resistance and chemical stability of glass are reduced. Therefore, the content of _Rn2O in the present invention is 0-8%, preferably 0-4%, and more preferably 0-2%. In some embodiments, it is further preferred that _Rn2O is not contained.

ZnO can adjust the refractive index and dispersion of glass, and reduce the high temperature viscosity and transition temperature of glass. If the ZnO content is too high, the difficulty of glass molding increases and the anti-crystallization performance deteriorates. Therefore, the ZnO content is 0-10%, preferably 1-8%, and more preferably 2-7%.

In some embodiments, the ratio of the total content of ZnO and Ta ₂ O ₅ (ZnO+Ta ₂ O ₅ ) to the content of Nb ₂ O ₅ ((ZnO+Ta ₂ O ₅ )/Nb ₂ O ₅₎ ) is controlled below 2.0, which is beneficial to improving the chemical stability and light transmittance of the glass. Therefore, it is preferred that (ZnO+Ta ₂ O ₅ )/Nb ₂ O ₅ is below 2.0, and it is more preferred that (ZnO+Ta ₂ O ₅ )/Nb ₂ O ₅ is below 1.5. Furthermore, by controlling (ZnO+Ta ₂ O ₅ )/Nb ₂ O ₅ below 1.0, the Young's modulus and the degree of blistering of the glass can be further improved. Therefore, it is more preferred that (ZnO+ _Ta2O5 )/ _Nb2O5 is _1.0 or less, _and it is further preferred _that (ZnO+ _Ta2O5 )/ _Nb2O5 is 0.1 to _0.8 .

In some embodiments, by controlling the ratio of the total content of Gd ₂ O ₃ and ZnO Gd ₂ O ₃ + ZnO to the content of Y ₂ O ₃ (Gd ₂ O ₃ + ZnO) / Y ₂ O ₃ to be below 2.0, the thermal expansion coefficient of the glass can be reduced and the abrasiveness of the glass can be optimized. Therefore, it is preferred that (Gd ₂ O ₃ + ZnO) / Y ₂ O ₃ is below 2.0, and it is more preferred that (Gd ₂ O ₃ + ZnO) / Y ₂ O ₃ is below 1.5. Furthermore, by controlling (Gd ₂ O ₃ + ZnO) / Y ₂ O ₃ to be below 1.0, the glass can more easily obtain a suitable Young's modulus and prevent the hardness of the glass from decreasing. Therefore, (Gd ₂ O ₃ + ZnO)/Y ₂ O ₃ is more preferably 1.0 or less, and (Gd ₂ O ₃ + ZnO)/Y ₂ O ₃ is still more preferably 0.8 or less.

WO ₃ can improve the refractive index and mechanical strength of glass. If the content of WO ₃ exceeds 8%, the thermal stability of glass decreases and the resistance to devitrification decreases. Therefore, the content of WO ₃ is 0-8%, preferably 0-6%, and more preferably 0-4%.

In some embodiments, the ratio of the total content of Gd ₂ O ₃ , Ta ₂ O ₅ , and WO ₃ (Gd ₂ O ₃ +Ta ₂ O ₅ +WO ₃₎ to the content of La ₂ O ₃ (Gd ₂ O ₃ +Ta ₂ O ₅ +WO ₃ )/La ₂ O ₃₎ is controlled to be below 0.5, which can reduce the density of the glass and improve the light transmittance of the glass. Therefore, it is preferred that (Gd ₂ O ₃ +Ta ₂ O ₅ +WO ₃ )/La ₂ O ₃ is below 0.5, and it is more preferred that (Gd ₂ O ₃ +Ta ₂ O ₅ +WO ₃ )/La ₂ O ₃ is below 0.4. Furthermore, by controlling (Gd ₂ O ₃ +Ta ₂ O ₅ +WO ₃ )/La ₂ O ₃ to be below 0.3, the abrasion resistance and thermal expansion coefficient of the glass can be further optimized. Therefore, (Gd ₂ O ₃ +Ta ₂ O ₅ +WO ₃ )/La ₂ O ₃ is more preferably 0.3 or less, and (Gd ₂ O ₃ +Ta ₂ O ₅ +WO ₃ )/La ₂ O ₃ is still more preferably 0.2 or less.

In some embodiments, the ratio of the total content of ZnO and WO ₃ ZnO + WO ₃ to the content of Nb ₂ O ₅ (ZnO + WO ₃ ) / Nb ₂ O ₅₎ is controlled to be below 3.0, which can improve the weather resistance of the glass and reduce the density of the glass. Therefore, it is preferred that (ZnO + WO ₃ ) / Nb ₂ O ₅ is below 3.0, more preferably (ZnO + WO ₃ ) / Nb ₂ O ₅ is below 2.0, and further preferably (ZnO + WO ₃ ) / Nb ₂ O ₅ is below 1.5. Furthermore, by controlling (ZnO + WO ₃ ) / Nb ₂ O ₅ within the range of 0.2 to 1.0, the hardness of the glass can be further optimized. Therefore, it is further preferred that (ZnO + WO ₃ ) / Nb ₂ O ₅ is 0.2 to 1.0.

_Al2O3 can improve the chemical stability of glass, but when its content exceeds 5%, _{the glass's solubility and light transmittance deteriorate. Therefore, in the present invention, the content of Al2O3 is 0-5} %, preferably 0-3%, and more preferably 0-1%. In some embodiments, it is further preferred _{that Al2O3} is not contained.

GeO ₂ has the effect of increasing the refractive index and resistance to devitrification, but if its content is too high, the chemical stability of the glass will decrease; on the other hand, compared with other components, GeO ₂ is very expensive, and from the perspective of practicality and cost, its usage should be reduced as much as possible. Therefore, in the present invention, the content of GeO ₂ is limited to 0-5%, preferably 0-3%, more preferably 0-1%, and it is further preferred that GeO ₂ is not contained.

In the present invention, by containing 0-1% 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 0-0.5%, and more preferably 0-0.2%. 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 1%, 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 0-1%, more preferably 0-0.5%, further preferably 0-0.2%, and further preferably does not contain _Sb2O3 . _{SnO and SnO2 can} also be used as clarifiers, but when their content exceeds 1%, 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 0-1%, more preferably 0-0.5%, further preferably 0-0.2%, and further preferably does not contain _SnO2 ; the content of SnO is preferably 0-1%, more preferably 0-0.5%, further preferably 0-0.2%, 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 0-1%, more preferably 0-0.5%, further preferably 0-0.2%, and further preferably does not contain _CeO2 .

＜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.

In recent years, the oxides of Th, Cd, Tl, Os, Be and Se have tended to be controlled as harmful chemicals, and environmental protection measures are necessary not only in the manufacturing process of glass, but also in the processing process and the disposal after productization. Therefore, in the case of paying attention to the impact on the environment, it is preferred that they are not actually contained except for the inevitable mixing. As a result, the optical glass does not actually contain substances that pollute the environment. Therefore, even without taking special environmental countermeasures, the optical glass of the present invention can be manufactured, processed and discarded.

In order to achieve environmental friendliness, the optical glass of the present invention preferably does not contain As ₂ O ₃ and PbO.

The term "does not contain" or "0%" described herein 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 raw materials and/or equipment for producing optical glass, there may be certain impurities or components that are not intentionally added and may be contained in a small amount or trace amount in the final optical glass, and such a situation is also within the scope of protection of the patent of the present invention.

Next, the properties 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 1.82, preferably 1.83, and more preferably 1.84.

In some embodiments, the upper limit of the refractive index (n _d ) of the optical glass of the present invention is 1.89, preferably 1.88, and more preferably 1.87.

In some embodiments, the lower limit of the Abbe number (ν _d ) of the optical glass of the present invention is 37, preferably 38, and more preferably 39.

In some embodiments, the upper limit of the Abbe number (ν _d ) of the optical glass of the present invention is 44, preferably 43, and more preferably 42.

＜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 5.00 g/cm ³ or less, preferably 4.90 g/cm ³ or less, and more preferably 4.80 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 Class 2 or higher, preferably Class 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 Class 2 or higher, preferably Class 1.

＜Coloring＞

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 _λ70 of the optical glass of the present invention is below 400 nm, preferably below ₃₉₅ nm, and more preferably below ₃₉₀ nm.

In some embodiments, the λ ₅ of the optical glass of the present invention is below 350 nm, preferably λ ₅ is below 345 nm, and more preferably λ ₅ is below 340 nm.

＜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 Class 2 or above, preferably Class 1.

＜Knoop hardness＞

The Knoop hardness ( _HK ) 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 670×10 ⁷ Pa or more, preferably 680×10 ⁷ Pa or more, more preferably 690×10 ⁷ Pa or more, and further preferably 695×10 ⁷ Pa or more.

＜Young's modulus＞

Young's modulus (E) is measured by ultrasonic testing of the longitudinal wave velocity and transverse wave velocity, and then calculated using the following formula.

G = V _S ² ρ

Where: E is Young's modulus, Pa;

G is the shear modulus, Pa;

_VT 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 Young's modulus (E) of the optical glass of the present invention is 10500×10 ⁷ Pa or more, preferably 11000×10 ⁷ Pa or more, and more preferably 11500×10 ⁷ Pa or more.

＜Abrasion＞

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:

_FA =V/V0 _× 100=(W/ρ)/( _W0 / _ρ0 )×100

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

V ₀ — volumetric wear of standard sample;

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

W ₀ — standard sample quality wear;

ρ—density of the sample being tested;

ρ ₀ — standard sample density.

In some embodiments, the abrasion resistance ( _FA ) of the optical glass of the present invention has a lower limit of 75, preferably 80, and more preferably 86.

In some embodiments, the upper limit of the abrasion resistance ( _FA ) of the optical glass of the present invention is 120, preferably 110, and more preferably 105.

＜Foaminess＞

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 above grade A, preferably above grade _A0 , and more preferably grade _A00 .

[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 1200-1500°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 by the optical glass of the present invention. The glass preform of the present invention has the excellent properties of optical glass; the optical element of the present invention has the excellent properties of optical glass, and can provide various optical elements such as lenses and prisms 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 manufacture optical instruments such as camera equipment, photographic equipment, projection equipment, display devices, vehicle-mounted equipment and monitoring equipment.

Embodiment

<Optical Glass Example>

In order to further clearly explain and illustrate the technical solution of the present invention, the following non-limiting embodiments 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# SiO2 10.23 13.5 15.2 8.52 3.75 5.3 4.73 6.72 B2O3 18.6 9.45 10.43 17.24 21.05 11.84 17.35 15.23 La2O3 46.37 45.75 46.71 47.6 47.11 42.82 46.8 43.98 Y2O3 5.25 4.65 8.24 13.32 6.33 12.5 15.4 7.2 Gd2O3 0 2.6 0 0 1.5 0 0.55 0 Yb2O3 0 0 0 0 0 0 0 0 ZrO2 2.45 11.5 13.24 3.7 4.45 1.54 5.5 10.25 Nb2O5 13.2 8.23 3.35 7.12 5.58 12.4 6.54 9.2 TiO2 0 0 0 0.1 0 0 0.3 0 Ta2O5 0 1.2 0 0 0.6 0.8 0 2.1 MgO 1 0 0 0.8 0 0 0 0 CaO 0 0 1.4 0.6 0 2.5 0 0 SrO 0 0 0 0 0 0 0 0 BaO 0 2.2 0 0 1.6 0 0 0 Li2O 0 0 0.6 0 0 1 0 0 Na2O 0 0 0 0 0 0.5 0 0 K2O 0 0 0 0 0.8 0 0 1 WO3 1.3 0 0.5 0.8 0 5.2 0 0 ZnO 1.6 0.82 0.33 0 7.23 3.5 2.63 4.32 Al2O3 0 0 0 0 0 0 0 0 GeO2 0 0 0 0 0 0 0 0 Sb2O3 0 0.1 0 0 0 0.1 0.2 0 SnO 0 0 0 0 0 0 0 0 SnO2 0 0 0 0.2 0 0 0 0 CeO2 0 0 0 0 0 0 0 0 Total 100 100 100 100 100 100 100 100 (ZnO+Ta2O5)/Nb2O5 0.121 0.245 0.099 0 1.403 0.347 0.402 0.698 (Gd2O3+Ta2O5+WO3)/La2O3 0.028 0.083 0.011 0.017 0.045 0.14 0.012 0.048 (Ta2O5+Gd2O3)/Y2O3 0 0.817 0 0 0.332 0.064 0.036 0.292 La2O3/(B2O3+Nb2O5) 1.458 2.588 3.39 1.954 1.769 1.767 1.959 1.8 (ZnO+WO3)/Nb2O5 0.22 0.1 0.248 0.112 1.296 0.702 0.402 0.47 (B2O3+RO)/La2O3 0.423 0.255 0.253 0.392 0.481 0.335 0.371 0.347 (Gd2O3+ZnO)/Y2O3 0.305 0.735 0.04 0 1.379 0.28 0.206 0.6 nd 1.8648 1.8836 1.8655 1.8373 1.8225 1.8428 1.8467 1.8756 νd 37.35 39.27 43.26 39.85 43.15 37.83 42.56 39.78 DW Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 DA 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 (×107Pa) 697 694 695 698 688 702 703 701 FA 93 85 94 92 106 95 95 93 E (×107Pa) 11676 11745 11342 11858 11273 12437 12520 12438 ρ(g/cm3) 4.75 4.83 4.73 4.80 4.82 4.72 4.73 4.75 λ70（nm） 382 384 388 390 387 380 377 382 λ5（nm） 331 333 338 340 336 328 327 330 Bubble degree (level) A0 A00 A0 A00 A0 A00 A00 A00 α-30/70℃(×10-7/K) 73 66 70 65 72 63 64 65 [table 3] Example (wt%) 9# 10# 11# 12# 13# 14# 15# 16# SiO2 8.24 7.92 9.03 9.44 11.25 12.24 8.43 9.15 B2O3 14.75 12.24 13.54 19.2 20.35 16.38 14.82 13.64 La2O3 50.67 44.32 43.88 51.87 41.03 41.67 49.28 49.08 Y2O3 3.5 9.44 10.24 4.1 3.2 11.54 9.32 10.04 Gd2O3 0 0 0 0 0 0 0 0 Yb2O3 0 0 0 0 0 0 0 0 ZrO2 9.32 6.16 7.35 4.29 8.18 5.03 6.43 5.26 Nb2O5 10.42 11.22 7.43 8.04 8.32 9.12 6.54 6.8 TiO2 1 0 0.5 0 2.2 0 0 0.3 Ta2O5 0 1.3 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 1.2 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 WO3 2.1 0 2.5 0 1.2 0.6 1.4 0 ZnO 0 6.2 5.53 3.06 4.17 3.42 3.58 4.63 Al2O3 0 0 0 0 0 0 0 1.1 GeO2 0 0 0 0 0 0 0 0 Sb2O3 0 0 0 0 0.1 0 0.2 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 (ZnO+Ta2O5)/Nb2O5 0 0.668 0.744 0.381 0.501 0.375 0.547 0.681 (Gd2O3+Ta2O5+WO3)/La2O3 0.041 0.029 0.057 0 0.029 0.014 0.028 0 (Ta2O5+Gd2O3)/Y2O3 0 0.138 0 0 0 0 0 0 La2O3/(B2O3+Nb2O5) 2.013 1.889 2.093 1.904 1.431 1.634 2.307 2.401 (ZnO+WO3)/Nb2O5 0.202 0.553 1.081 0.381 0.645 0.441 0.761 0.681 (B2O3+RO)/La2O3 0.291 0.303 0.309 0.37 0.496 0.393 0.301 0.278 (Gd2O3+ZnO)/Y2O3 0 0.657 0.54 0.746 1.303 0.296 0.384 0.461 nd 1.8783 1.8475 1.8633 1.8382 1.8553 1.8612 1.8524 1.8534 νd 38.86 38.24 42.16 41.25 40.74 39.66 40.27 41.04 DW Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 DA 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 (×107Pa) 703 705 693 705 690 704 702 705 FA 94 98 92 93 105 95 94 92 E (×107Pa) 11745 12510 12488 12523 11327 11784 12356 12452 ρ(g/cm3) 4.69 4.70 4.77 4.71 4.73 4.70 4.71 4.68 λ70（nm） 386 376 377 380 381 380 381 383 λ5（nm） 335 325 328 331 330 330 330 332 Bubble degree (level) A ₀₀ A ₀₀ A ₀₀ A ₀₀ A ₀ A ₀₀ A ₀₀ A ₀₀ α-30/70℃(×10-7/K) 62 60 62 65 75 63 64 62 [Table 4] Example (wt%) 17# 18# 19# 20# twenty one# twenty two# twenty three# twenty four# SiO2 9.42 8.74 7.83 8.28 6.32 10.23 9.83 8.75 B2O3 12.88 15.53 14.27 15.03 16.62 15.83 14.82 15.82 La2O3 47.87 47.77 47.08 44.64 47.52 46.97 46.48 49.15 Y2O3 8.54 9.32 11.15 10.64 10.38 9.24 7.34 8.5 Gd2O3 0 0 0 0 0 0 0 0 Yb2O3 0 0 0 0 0 0 0 0 ZrO2 8.05 5.22 4.85 6.37 6.25 5.43 4.76 6.35 Nb2O5 7.13 7.88 8.5 8.17 7.83 7.45 6.62 7.38 TiO2 0.8 0 0 1.1 0 0 1.5 0 Ta2O5 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 WO3 0.5 0 1.5 0 1.7 0.2 3.4 0 ZnO 4.81 5.54 4.82 5.77 3.38 4.65 5.25 4.05 Al2O3 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 (ZnO+Ta2O5)/Nb2O5 0.675 0.703 0.567 0.706 0.432 0.624 0.793 0.549 (Gd2O3+Ta2O5+WO3)/La2O3 0.01 0 0.032 0 0.036 0.004 0.073 0 (Ta2O5+Gd2O3)/Y2O3 0 0 0 0 0 0 0 0 La2O3/(B2O3+Nb2O5) 2.392 2.041 2.068 1.924 1.944 2.018 2.168 2.119 (ZnO+WO3)/Nb2O5 0.745 0.703 0.744 0.706 0.649 0.651 1.307 0.549 (B2O3+RO)/La2O3 0.269 0.325 0.303 0.337 0.35 0.337 0.319 0.322 (Gd2O3+ZnO)/Y2O3 0.563 0.594 0.432 0.542 0.326 0.503 0.715 0.476 nd 1.8522 1.8518 1.8512 1.8489 1.8515 1.8478 1.8521 1.8526 νd 40.88 40.62 41.21 40.54 40.26 41.38 40.72 40.57 DW Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 Category 1 DA 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 (×107Pa) 708 704 710 705 703 709 710 704 FA 91 95 94 96 95 93 95 94 E (×107Pa) 12507 12388 12463 12645 12482 12433 12684 12450 ρ(g/cm3) 4.67 4.71 4.72 4.74 4.70 4.72 4.78 4.71 λ70（nm） 382 380 378 377 380 379 378 376 λ5（nm） 330 328 328 327 331 330 327 326 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) 64 65 63 66 65 67 63 64

<Glass Preform Example>

The glass obtained from optical glass embodiments 1 to 24# is used to make preforms of various lenses, prisms, etc., such as concave meniscus lenses, convex meniscus lenses, double convex lenses, double concave lenses, plano-convex lenses, and plano-concave lenses, using means such as grinding processing, or molding means such as re-hot pressing molding, precision stamping molding, etc.

<Optical Element Embodiment>

The preforms obtained in the above-mentioned glass preform embodiment are annealed to reduce the internal stress of the glass and fine-tune the refractive index so that the optical properties such as the refractive index reach the desired values.

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

＜Optical Instrument Embodiment＞

The optical element manufactured by the above-mentioned optical element embodiment is optically designed and formed into an optical component or optical element by using one or more optical elements. It can be used in, for example, imaging equipment, sensors, microscopes, medical technology, digital projection, communications, 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 (17)

An optical glass, wherein the components thereof are expressed in weight percentage and contain: SiO ₂ : 2-18%; B ₂ O ₃ : 8-22%; La ₂ O ₃ : 40-60%; Y ₂ O ₃ : 3-18%; ZrO ₂ : 1-15%; and Nb ₂ O ₅ : 2-15%. The optical glass as claimed in claim 1, wherein the components thereof are expressed in weight percentage and further contain: Ta ₂ O ₅ : 0-10%; and/or Gd ₂ O ₃ : 0-9%; and/or TiO ₂ : 0-6%; and/or RO: 0-10%; and/or Rn ₂ O: 0-8%; and/or WO ₃ : 0-8%; and/or ZnO: 0-10%; and/or Al ₂ O ₃ : 0-5%; and/or Yb ₂ O ₃ : 0-8%; and/or GeO ₂ : 0-5%; and/or a clarifier: 0-1%, wherein 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 Sb ₂ O ₃ , SnO, SnO ₂ , CeO One or more of ₂ . An optical glass, wherein the components thereof are expressed in weight percentage and are composed of _SiO2 : 2-18%; _B2O3 : 8-22% _; La2O3: 40-60%; Y2O3: 3-18%; _ZrO2 : 1-15%; _Nb2O5 : 2-15%; Ta2O5 _: 0-10% _{; Gd2O3} : _0-9 % _{; TiO2} : _0-6 %; _{RO :} 0-10%; Rn2O: _0-8 %; _{WO3 :} 0-8%; ZnO: _0-10 %; Al2O3: 0-5%; _Yb2O3 : 0-8%; GeO2: 0-5%; and a clarifier: _0-1 %, wherein RO is one or more of MgO, CaO, SrO, and BaO, and _Rn2O is _Li2O , _{Na2O , or} the like. 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 seven conditions: 1) (ZnO + Ta ₂ O ₅ ) / Nb ₂ O ₅ is 2.0 or less; 2) (Gd ₂ O ₃ + Ta ₂ O ₅ + WO ₃ ) / La ₂ O ₃ is 0.5 or less; 3) (Ta ₂ O ₅ + Gd ₂ O ₃ ) / Y ₂ O ₃ is 1.0 or less; 4) La ₂ O ₃ / (B ₂ O ₃ + Nb ₂ O ₅ ) is 1.2 to 5.0; 5) (ZnO + WO ₃ ) / Nb ₂ O ₅ is 3.0 or less; 6) (B ₂ O ₃ + RO) / La ₂ O ₃ is 0.15 to 0.7; 7) (Gd ₂ O ₃ + ZnO) / Y ₂ O 3 is 1.2 to 5.0; ₃ is less than 2.0, and the RO is one or more of MgO, CaO, SrO, and BaO. 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 seven conditions: 1) (ZnO + Ta ₂ O ₅ ) / Nb ₂ O ₅ is 1.5 or less; 2) (Gd ₂ O ₃ + Ta ₂ O ₅ + WO ₃ ) / La ₂ O ₃ is 0.4 or less; 3) (Ta ₂ O ₅ + Gd ₂ O ₃ ) / Y ₂ O ₃ is 0.8 or less; 4) La ₂ O ₃ / (B ₂ O ₃ + Nb ₂ O ₅ ) is 1.3 to 4.0; 5) (ZnO + WO ₃ ) / Nb ₂ O ₅ is 2.0 or less; 6) (B ₂ O ₃ + RO) / La ₂ O ₃ is 0.15 to 0.6; 7) (Gd ₂ O ₃ + ZnO) / Y ₂ O 3 is 0.15 to 0.6; ₃ is less than 1.5, and the RO is one or more of MgO, CaO, SrO, and BaO. 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 seven conditions: 1) (ZnO + Ta ₂ O ₅ ) / Nb ₂ O ₅ is 1.0 or less; 2) (Gd ₂ O ₃ + Ta ₂ O ₅ + WO ₃ ) / La ₂ O ₃ is 0.3 or less; 3) (Ta ₂ O ₅ + Gd ₂ O ₃ ) / Y ₂ O ₃ is 0.5 or less; 4) La ₂ O ₃ / (B ₂ O ₃ + Nb ₂ O ₅ ) is 1.5 to 3.5; 5) (ZnO + WO ₃ ) / Nb ₂ O ₅ is 1.5 or less; 6) (B ₂ O ₃ + RO) / La ₂ O ₃ is 0.18 to 0.5; 7) (Gd 2 O 3 + ZnO) / Y ₂ O 3 is 0.6 to 0.8; 8) (Gd ₂ O ₃ + ZnO) / ₃ is less than 1.0, and the RO is one or more of MgO, CaO, SrO, and BaO. The optical glass as described in any one of claims 1 to 3, wherein the composition thereof, expressed in weight percentage, satisfies one or more of the following seven conditions: 1) (ZnO+Ta ₂ O ₅ )/Nb ₂ O ₅ is 0.1 to 0.8; 2) (Gd ₂ O ₃ +Ta ₂ O ₅ +WO ₃ )/La ₂ O ₃ is 0.2 or less; 3) (Ta ₂ O ₅ +Gd ₂ O ₃ )/Y ₂ O ₃ is 0.2 or less; 4) La ₂ O ₃ /(B ₂ O ₃ +Nb ₂ O ₅ ) is 1.7 to 2.7; 5) (ZnO+WO ₃ )/Nb ₂ O ₅ is 0.2 to 1.0; 6) (B ₂ O ₃ +RO)/La ₂ O ₃ is 0.2 to 0.4; 7) (Gd ₂ O ₃ +ZnO)/Y 2 O 3 is 0.2 to 0.5; ₂ O ₃ is below 0.8, and the RO is one or more of MgO, CaO, SrO, and BaO. The optical glass as claimed in any one of claims 1 to 3, wherein the components are expressed in weight percentage, wherein: SiO ₂ : 4 to 15%; and/or B ₂ O ₃ : 10 to 20%; and/or La ₂ O ₃ : 43 to 55%; and/or Y ₂ O ₃ : 5 to 15%; and/or ZrO ₂ : 2 to 12%; and/or Nb ₂ O ₅ : 3 to 13%; and/or Ta ₂ O ₅ : 0 to 5%; and/or Gd ₂ O ₃ : 0 to 5%; and/or TiO ₂ : 0 to 4%; and/or RO : 0 to 5%; and/or Rn ₂ O : 0 to 4%; and/or WO ₃ : 0 to 6%; and/or ZnO : 1 to 8%; and/or Al ₂ O ₃ : 0 to 3%; and/or Yb ₂ O ₃ : 0 to 3%; and/or GeO ₂ : 0-3%; 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 as claimed in any one of claims 1 to 3, wherein the components are expressed in weight percentage, wherein: SiO ₂ : 6 to 12%; and/or B ₂ O ₃ : 12 to 18%; and/or La ₂ O ₃ : 46 to 52%; and/or Y ₂ O ₃ : 7 to 13%; and/or ZrO ₂ : 3 to 10%; and/or Nb ₂ O ₅ : 5 to 11%; and/or Ta ₂ O ₅ : 0 to 2%; and/or Gd ₂ O ₃ : 0 to 2%; and/or TiO ₂ : 0 to 2%; and/or RO : 0 to 2%; and/or Rn ₂ O : 0 to 2%; and/or WO ₃ : 0 to 4%; and/or ZnO : 2 to 7%; and/or Al ₂ O ₃ : 0 to 1%; and/or Yb ₂ O ₃ : 0 to 1%; and/or GeO ₂ : 0-1%; and/or clarifier: 0-0.2%, 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 as described in any one of claims 1 to 3, wherein its composition does not contain Ta ₂ O ₅ ; and/or does not contain RO; and/or does not contain Rn ₂ O; and/or does not contain Gd ₂ O ₃ ; and/or does not contain Yb ₂ O ₃ ; and/or does not contain Al ₂ O ₃ ; and/or does not contain GeO ₂ , 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. The optical glass as described in any one of claims 1 to 3, wherein the refractive index _nd of the optical glass is 1.82 to 1.89, and the Abbe number _vd is 37 to 44. The optical glass as described in any one of claims 1 to 3, wherein the refractive index _nd of the optical glass is 1.84 to 1.87, and the Abbe number _vd is 39 to 42. The optical glass as described in any one of claims 1 to 3, wherein the density ρ of the optical glass is 5.00 g/cm ³ or less; and/or the thermal expansion coefficient α _{-30/70 °C} is 85×10 ^-7 /K or less; and/or the water resistance stability D _W is Class 2 or more; and/or the acid resistance stability _DA is Class 2 or more; and/or λ ₇₀ is 400 nm or less; and/or λ ₅ is 350 nm or less; and/or the weather resistance CR is Class 2 or more; and/or the Knoop hardness H _K is 670×10 ⁷ Pa or more; and/or the Young's modulus E is 10500×10 ⁷ Pa or more; and/or the abrasion resistance _FA is 75 to 120; and/or the bubble degree is Class A or more. The optical glass as described in any one of claims 1 to 3, wherein the density ρ of the optical glass is 4.80 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 390 nm or less; and/or λ ₅ is 340 nm or less; and/or the weather resistance CR is Class 1; and/or the Knoop hardness H _K is 690×10 ⁷ Pa or more; and/or the Young's modulus E is 11500×10 ⁷ Pa or more; and/or the abrasion degree _FA is 86 to 105; and/or the bubble degree is A ₀₀ grade. A glass preform, wherein the preform is made of the optical glass as described in any one of claims 1 to 14. An optical element, wherein the optical element is made of the optical glass as described in any one of claims 1 to 14, or is made of the glass preform as described in claim 15. An optical instrument, comprising the optical glass as described in any one of claims 1 to 14, and/or the optical element as described in claim 16.