TWI687385B

TWI687385B - Optical glass and optical components

Info

Publication number: TWI687385B
Application number: TW107110484A
Authority: TW
Inventors: 佐佐木勇人; 塩田勇樹; 池西幹男
Original assignee: 日商Ｈｏｙａ股份有限公司
Priority date: 2017-03-31
Filing date: 2018-03-27
Publication date: 2020-03-11
Also published as: TW201841848A; KR102077390B1; KR20180111681A; CN108689599A

Abstract

本發明提供光學玻璃和光學元件，上述光學玻璃包含P⁵⁺ 、Al³⁺ 、Nb⁵⁺ 、O^2- 及F^- 作為必要成分，Al³⁺ 的含量相對於P⁵⁺ 的含量的莫耳比(Al³⁺ /P⁵⁺ )為0.30以上，Nb⁵⁺ 的含量為1.0陽離子%以上，O^2- 含量為10～85陰離子%、F^- 的含量為15～90陰離子%、O^2- 的含量相對於P⁵⁺ 和Nb⁵⁺ 的合計含量的莫耳比(O^2- /(P⁵⁺ +Nb⁵⁺ ))為3.0以上。The present invention provides an optical glass and an optical element. The optical glass includes P ⁵⁺ , Al ³⁺ , Nb ⁵⁺ , O ^2- and F ^- as essential components, and the content of Al ³⁺ relative to the content of P ⁵⁺ The ratio (Al ³⁺ /P ⁵⁺ ) is 0.30 or more, the Nb ⁵⁺ content is 1.0 cation% or more, the O ^2- content is 10 to 85 anion %, the F ^- content is 15 to 90 anion %, O ^2- The molar ratio (O ^2- /(P ⁵⁺ +Nb ⁵⁺ )) to the total content of P ⁵⁺ and Nb ⁵⁺ is 3.0 or more.

Description

光學玻璃及光學元件Optical glass and optical components

本發明關於一種光學玻璃和光學元件。The invention relates to an optical glass and an optical element.

包含磷、氧及氟的氟磷酸鹽玻璃作為色散低、顯示出正的異常色散性的光學玻璃廣為人知。因為氟磷酸鹽玻璃具有上述的優異的光學特性，因此作為用於校正高階的色像差的光學元件材料的利用價值高。這樣的氟磷酸鹽玻璃的例子在專利文獻1～4中有所記載。Fluorophosphate glass containing phosphorus, oxygen, and fluorine is widely known as an optical glass having low dispersion and showing positive abnormal dispersion. Since fluorophosphate glass has the above-mentioned excellent optical characteristics, it has high utility value as an optical element material for correcting high-order chromatic aberration. Examples of such fluorophosphate glasses are described in Patent Documents 1 to 4.

[先前技術文獻] [專利文獻] 專利文獻1：日本特開2005-112717號公報。專利文獻2：日本特開2013-151410號公報。專利文獻3：日本特開昭51-114412號公報。專利文獻4：日本特開昭58-217451號公報。[Prior Art Literature] [Patent Literature] Patent Literature 1: Japanese Patent Laid-Open No. 2005-112717. Patent Document 2: Japanese Patent Laid-Open No. 2013-151410. Patent Document 3: Japanese Patent Laid-Open No. 51-114412. Patent Document 4: Japanese Unexamined Patent Publication No. 58-217451.

[發明所欲解決的問題][Problems to be solved by the invention]

雖然像這樣之氟磷酸鹽玻璃具有優異的光學特性，但是在對玻璃進行熔融、成型的高溫步驟中顯示出明顯的揮發性。在熔融、成型過程中發生從玻璃熔融液中揮發的情況可能會成為玻璃的變質、光學特性的變動、玻璃的均勻性降低這類現象產生的原因。Although fluorophosphate glass like this has excellent optical properties, it shows significant volatility in the high-temperature step of melting and shaping the glass. The volatilization from the glass melt during melting and forming may cause the glass to deteriorate, the optical characteristics to change, and the uniformity of the glass to decrease.

此外，在對由光學玻璃形成的玻璃材料進行研磨、拋光，製作透鏡、棱鏡等光學元件的過程中，通常會對拋光後的玻璃進行清洗。另一方面，在被拋光的玻璃的表面，通常存在目視無法辨認，被稱為潛在傷痕的微小傷痕。但是，當由於清洗而玻璃的表面受到侵蝕時，有時潛在傷痕擴大、顯現出來而成為光的散射源，則玻璃的表面品質降低。此外，有時亦由於清洗所導致的玻璃表面的變質而使玻璃的表面品質降低。對於氟磷酸鹽玻璃，為了抑制上述那樣的玻璃表面品質的降低，期望提高氟磷酸鹽玻璃的化學耐久性。In addition, in the process of grinding and polishing a glass material formed of optical glass and manufacturing optical elements such as lenses and prisms, the polished glass is usually washed. On the other hand, on the surface of the polished glass, there are usually small flaws called latent flaws that are not recognizable visually. However, when the surface of the glass is eroded due to cleaning, the potential flaws may expand and appear as a light scattering source, and the surface quality of the glass may deteriorate. In addition, the surface quality of the glass is sometimes deteriorated due to the deterioration of the glass surface caused by cleaning. For the fluorophosphate glass, in order to suppress the deterioration of the glass surface quality as described above, it is desired to improve the chemical durability of the fluorophosphate glass.

本發明的一實施態樣的目的在於提供於高溫步驟中的氟磷酸鹽玻璃揮發性低減的同時，部分分散比大、適於色像差校正的光學玻璃；以及由上述光學玻璃形成的光學元件。An object of an embodiment of the present invention is to provide an fluorophosphate glass in a high-temperature step with reduced volatility, a partially dispersed ratio, and an optical glass suitable for correction of chromatic aberration; and an optical element formed of the foregoing optical glass .

此外，本發明的另外一實施態樣的目的在於提供具有優異的化學耐久性，且部分分散比大、適於色像差校正的由氟磷酸鹽玻璃形成的光學玻璃；以及由上述光學玻璃形成的光學元件。 [用以解決問題的技術手段]In addition, an object of another embodiment of the present invention is to provide an optical glass formed of fluorophosphate glass having excellent chemical durability, a large partial dispersion ratio, and suitable for chromatic aberration correction; and an optical glass formed of the above Optics. [Technical means to solve problems]

本發明的一實施態樣涉及一種光學玻璃(以下，也記載為「光學玻璃1」)，包含P⁵⁺ 、Al³⁺ 、Nb⁵⁺ 、O^2- 及F^- 作為必要成分； Al³⁺ 的含量相對於P⁵⁺ 的含量的莫耳比(Al³⁺ /P⁵⁺ )為0.30以上； Nb⁵⁺ 的含量為1.0陽離子%以上； O^2- 的含量為10～85陰離子%； F^- 的含量為15～90陰離子%； O^2- 的含量相對於P⁵⁺ 和Nb⁵⁺ 的合計含量的莫耳比(O^2- /(P⁵⁺ +Nb⁵⁺ ))為3.0以上。An embodiment of the present invention relates to an optical glass (hereinafter also referred to as "optical glass 1"), which includes P ⁵⁺ , Al ³⁺ , Nb ⁵⁺ , O ^2- and F ^- as essential components; Al ³⁺ the molar ratio of the content with respect to the content of P ⁵⁺ (Al ³⁺ / P ⁵⁺⁾ of 0.30 or more; Nb ⁵⁺ content is at least 1.0 cation%; O ^2- content of 10 to 85 anionic%; F ^- an amount of 15 to 90 anionic%; molar ratio ^{^{(O 2- / (P 5+ +}} Nb 5+)) O ^2- content relative to the total content of Nb ⁵⁺ and P ⁵⁺ is less than 3.0.

上述光學玻璃較佳具有正的異常色散性。作為正的異常色散性的指標，可使用部分分散比Pg,F。部分分散比Pg,F使用F線(波長486.13nm)處的折射率nF、C線(波長656.27nm)處的折射率nC以及g線(波長435.84nm)處的折射率ng，如下式這樣表示。 Pg,F＝(ng-nF)/(nF-nC) ・・・(1)式已知玻璃中包含的Nb在紫外區域的固有吸收波長接近於可見光區域，此外吸收強度也大。由此，折射率的波長色散顯示出高色散化的傾向。亦即，顯示出F線與C線的折射率差nF-nC增大、阿貝數νd減小的傾向。另一方面，g線與F線的折射率差ng-nF也增大。在此，如果增大ng-nF的效果大於增大nF-nC的效果，則根據(1)式可知，Pg,F增大。本發明人著眼於該點，發現導入Nb作為玻璃成分，能夠在將低色散性(νd大)維持在與現有的氟磷酸鹽玻璃同程度的範圍的情況下，大幅增加部分分散比Pg,F。然而，含有Nb的氟磷酸鹽玻璃在其熔融過程中，Nb易於從玻璃熔融液中揮發。當在熔融過程中Nb和F結合時，會生成氟化鈮。氟化鈮的蒸汽壓高，易於從玻璃熔融液中揮發。為了讓用於提高部分分散比而導入的Nb不助長揮發，本發明人進行了深入研究，結果得到了以下的見解。一般認為P⁵⁺ 在玻璃中以-O-P-O-的結構存在，有助於玻璃的網路形成。亦認為與P⁵⁺ 價數相等的Nb⁵⁺ 也藉由在-O-P-O-結構中佔據P的位置從而有助於玻璃的網路形成。一般認為當Nb⁵⁺ 被引入到網路結構中時，不易產生蒸汽壓高的氟化鈮，其結果是玻璃的揮發性降低。但是，為了將Nb⁵⁺ 引入到網路結構中，需要充足數量的O^2- 。當考慮Nb⁵⁺ 存在的情況時，如果O^2- 的含量相對於構成網路的陽離子(P⁵⁺ 和Nb⁵⁺ )的合計含量的莫耳比(O^2- /(P⁵⁺ +Nb⁵⁺ ))為3.0以上，則Nb⁵⁺ 易於被引入到網路中，由此能夠抑制揮發性的增大。本發明人基於上述的見解，完成了關於上述本發明的一實施態樣的光學玻璃。The optical glass preferably has positive abnormal dispersion. As an index of positive abnormal dispersion, a partial dispersion ratio Pg, F can be used. The partial dispersion ratio Pg, F uses the refractive index nF at the F line (wavelength 486.13 nm), the refractive index nC at the C line (wavelength 656.27 nm), and the refractive index ng at the g line (wavelength 435.84 nm), as shown in the following formula . Pg,F=(ng-nF)/(nF-nC)-(1) It is known that the inherent absorption wavelength of Nb contained in glass in the ultraviolet region is close to that in the visible region, and the absorption intensity is also large. Thus, the wavelength dispersion of the refractive index shows a tendency to increase dispersion. That is, the refractive index difference nF-nC between the F line and the C line tends to increase, and the Abbe number νd tends to decrease. On the other hand, the refractive index difference ng-nF between the g-line and the F-line also increases. Here, if the effect of increasing ng-nF is greater than the effect of increasing nF-nC, it can be seen from equation (1) that Pg and F increase. The inventors focused on this point and found that the introduction of Nb as a glass component can greatly increase the partial dispersion ratio Pg,F while maintaining the low dispersion (large νd) in the same range as the existing fluorophosphate glass. . However, during the melting process of Nb-containing fluorophosphate glass, Nb tends to volatilize from the glass melt. When Nb and F are combined during the melting process, niobium fluoride is formed. Niobium fluoride has a high vapor pressure and is easy to volatilize from the glass melt. In order to prevent the Nb introduced for improving the partial dispersion ratio from promoting volatilization, the present inventors conducted intensive studies and as a result obtained the following insights. It is generally believed that P ⁵⁺ exists in the structure of -OPO- in the glass, which contributes to the formation of the glass network. It is also believed that Nb ^5+, which is equivalent to the valence of P ^5+, also contributes to the formation of the glass network by occupying the position of P in the -OPO- structure. It is generally believed that when Nb ⁵⁺ is introduced into the network structure, niobium fluoride with high vapor pressure is not easily generated, and as a result, the volatility of the glass is reduced. However, in order to introduce Nb ⁵⁺ into the network structure, a sufficient amount of O ^{2- is required} . When considering the present situation of Nb ^5+, if the molar ratio of O ^2- to the content of cation (P ⁵⁺ and Nb ⁵⁺⁾ constituting the web of the total content ^{^{(O 2- / (P 5+ +}} Nb ⁵⁺ )) is 3.0 or more, Nb ⁵⁺ can be easily introduced into the network, thereby suppressing an increase in volatility. Based on the above findings, the inventor has completed the optical glass according to one embodiment of the present invention.

本發明的另一實施態樣涉及一種光學玻璃，由氟磷酸鹽玻璃形成；浸漬於NaOH水溶液中15小時情況下的每單位面積的質量減少量D_NaOH 小於0.25mg/(cm² ・15h)；且阿貝數νd和部分分散比Pg,F滿足下述(4)式： Pg,F＞-0.0004νd+0.5718 ・・・(4)式。 [發明功效]Another embodiment of the present invention relates to an optical glass formed of fluorophosphate glass; the mass reduction per unit area D _{NaOH is} less than 0.25 mg/(cm ² ·15h) when immersed in a NaOH aqueous solution for 15 hours; The Abbe number νd and the partial dispersion ratio Pg, F satisfy the following formula (4): Pg, F>-0.0004νd+0.5718 (4) formula. [Effect of invention]

根據本發明的一實施態樣，能夠提供在高溫步驟中的氟磷酸鹽玻璃的揮發性降低的同時，部分分散比大、適於色像差校正的光學玻璃；能夠提供由上述光學玻璃形成的光學元件。此外，根據本發明的另一實施態樣，能夠提供作為氟磷酸鹽玻璃，部分分散比大、適於色像差校正且具有優異的化學耐久性的光學玻璃；能夠提供由上述光學玻璃形成的光學元件。According to an embodiment of the present invention, it is possible to provide an optical glass with a large partial dispersion ratio and suitable for chromatic aberration correction while reducing the volatility of fluorophosphate glass in a high-temperature step; Optical element. In addition, according to another embodiment of the present invention, it is possible to provide an fluorophosphate glass that has a large partial dispersion ratio, is suitable for chromatic aberration correction, and has excellent chemical durability; Optical element.

在本發明和本說明書中，陽離子成分的含量和合計含量只要沒有特別記述以陽離子%表示，陰離子成分的含量和合計含量只要沒有特別記述以陰離子%表示。在此，「陽離子%」是指按照「(關注的陽離子的個數/玻璃成分中的陽離子的總數)×100」算出的值，意為關注的陽離子量相對於陽離子成分的總量的莫耳百分率。此外，「陰離子%」是指按照「(關注的陰離子的個數/玻璃成分中的陰離子的總數)×100」算出的值，意為關注的陰離子量相對於陰離子成分的總量的莫耳百分率。陽離子成分彼此的含量的莫耳比等於關注的陽離子成分的以陽離子%表示的含量的比，陰離子成分彼此的含量的莫耳比等於關注的陰離子成分的以陰離子%表示的含量的比。陽離子成分的含量和陰離子成分的含量的莫耳比為將全部的陽離子成分和全部的陰離子成分的總量設為100莫耳%時的關注的成分彼此的含量(莫耳%表示)的比率。另外，各成分的含量能夠藉由公知的方法例如感應耦合電漿發射光譜分析法(ICP-AES)、感應耦合電漿質譜分析法(ICP-MS)、離子層析法等進行定量。In the present invention and the present specification, the content and the total content of the cationic component are expressed as cation% unless otherwise specified, and the content and the total content of the anionic component are expressed as anion% unless otherwise described. Here, "cation %" refers to a value calculated according to "(number of cations of interest/total number of cations in glass component) x 100", meaning moles of cations of interest relative to the total amount of cation components percentage. In addition, "anion %" means a value calculated according to "(number of anions of interest/total number of anions in glass component) x 100", meaning the molar percentage of the amount of anion of interest with respect to the total amount of anion components . The molar ratio of the content of the cationic components to each other is equal to the content ratio of the cationic component of interest in terms of cation %, and the molar ratio of the content of the anion component to each other is equal to the ratio of content of the anion component of interest in terms of anion %. The molar ratio of the content of the cationic component and the content of the anionic component is the ratio of the content of the components of interest (expressed in molar %) when the total amount of all cationic components and all anionic components is set to 100 molar %. In addition, the content of each component can be quantified by a known method such as inductively coupled plasma emission spectrometry (ICP-AES), inductively coupled plasma mass spectrometry (ICP-MS), ion chromatography, or the like.

此外，在本發明和本說明書中，「氟磷酸鹽玻璃」是指至少包含磷、氧及氟作為構成玻璃的元素的玻璃。In addition, in the present invention and the present specification, "fluorophosphate glass" refers to glass containing at least phosphorus, oxygen, and fluorine as elements constituting the glass.

[光學玻璃1] ＜玻璃成分＞以下，對本發明的一實施態樣的光學玻璃1進行說明。 P⁵⁺ 具有作為網路形成成分的作用。Al³⁺ 為發揮維持玻璃的熱穩定性、改善化學耐久性、加工性的作用的成分。從良好地維持玻璃的熱穩定性的方面出發，Al³⁺ 的含量相對於P⁵⁺ 的含量的莫耳比(Al³⁺ /P⁵⁺ )為0.30以上。在維持阿貝數的狀態下，提高折射率，將莫耳比(Al³⁺ /P⁵⁺ )設為0.30以上是有效的。莫耳比(Al³⁺ /P⁵⁺ )的較佳的下限為0.5。另一方面，從良好地維持玻璃的熱穩定性的方面出發，莫耳比(Al³⁺ /P⁵⁺ )的較佳的上限為2，更較佳的上限為1。[Optical glass 1] <Glass component> Hereinafter, an optical glass 1 according to an embodiment of the present invention will be described. P ⁵⁺ has a role as a network forming component. Al ³⁺ is a component that functions to maintain the thermal stability of glass, improve chemical durability, and workability. From the aspect of maintaining good thermal stability of the glass, the content of Al ³⁺ with respect to the molar ratio of the content of P ⁵⁺ (Al ³⁺ / P ⁵⁺⁾ is 0.30 or more. While maintaining the Abbe number, it is effective to increase the refractive index and set the molar ratio (Al ³⁺ /P ⁵⁺ ) to 0.30 or more. The preferred lower limit of the molar ratio (Al ³⁺ /P ⁵⁺ ) is 0.5. On the other hand, from the viewpoint of maintaining the thermal stability of the glass well, the preferred upper limit of the molar ratio (Al ³⁺ /P ⁵⁺ ) is 2, and the more preferred upper limit is 1.

Nb⁵⁺ 具有與P⁵⁺ 一起作為網路形成成分而維持玻璃的熱穩定性並且使部分分散比增加的作用。為了得到這樣的效果，Nb⁵⁺ 的含量為1.0%以上。Nb⁵⁺ 的含量的較佳的下限為1.5%，更佳的下限為2%，進一步較佳的下限為2.5%，更進一步較佳的下限為3%。另一方面，當Nb⁵⁺ 的含量過剩時，玻璃熔融時的揮發性變得顯著，產生玻璃的均勻性降低的傾向。因此，Nb⁵⁺ 的含量的較佳的上限為15%，更佳的上限為13%，進一步較佳的上限為10%。另外，關於Nb⁵⁺ 和玻璃的化學耐久性的關係如後所述。Nb ⁵⁺ has a role as P ⁵⁺ as a network forming component to maintain the thermal stability of the glass and increase the partial dispersion ratio. In order to obtain such an effect, the content of Nb ⁵⁺ is 1.0% or more. The preferred lower limit of the content of Nb ⁵⁺ is 1.5%, the more preferred lower limit is 2%, the further preferred lower limit is 2.5%, and the further preferred lower limit is 3%. On the other hand, when the content of Nb ⁵⁺ is excessive, the volatility when the glass is melted becomes significant, and the uniformity of the glass tends to decrease. Therefore, the preferable upper limit of the content of Nb ⁵⁺ is 15%, the more preferable upper limit is 13%, and the more preferable upper limit is 10%. In addition, the relationship between Nb ⁵⁺ and the chemical durability of glass will be described later.

從維持玻璃的熱穩定性的方面出發，P⁵⁺ 和Nb⁵⁺ 的合計含量(P⁵⁺ +Nb⁵⁺ )較佳為15%以上。P⁵⁺ 和Nb⁵⁺ 的合計含量(P⁵⁺ +Nb⁵⁺ )的較佳的下限為20%。From the viewpoint of maintaining the thermal stability of the glass, the total content of P ⁵⁺ and Nb ⁵⁺ (P ⁵⁺ +Nb ⁵⁺ ) is preferably 15% or more. The preferable lower limit of the total content of P ⁵⁺ and Nb ⁵⁺ (P ⁵⁺ +Nb ⁵⁺ ) is 20%.

O^2- 具有維持玻璃的熱穩定性的作用。為了得到這樣的作用，O^2- 的含量為10陰離子%以上。當O^2- 的含量比85陰離子%多時，F^- 的含量不足，難以得到低色散性。因此，O^2- 的含量為10～85陰離子%。O^2- 的含量的較佳的下限為20%，更佳的下限為30%，較佳的上限為80%，更佳的上限為75%，進一步較佳的上限為70.93%，更進一步較佳的上限為70%。O ^2- has the effect of maintaining the thermal stability of the glass. In order to obtain such an effect, the content of O ^2- is 10% or more of anion. When the content of O ^2- is more than 85% of anions, the content of F ^- is insufficient, and it is difficult to obtain low dispersion. Therefore, the content of O ^2- is 10 to 85% of anions. The preferred lower limit of the content of O ^2- is 20%, the more preferred lower limit is 30%, the preferred upper limit is 80%, the preferred upper limit is 75%, the further preferred upper limit is 70.93%, and the further The upper limit is 70%.

F^- 具有使玻璃低色散化並且賦予異常色散性的作用、使玻璃化轉變溫度降低、改善化學耐久性的作用。當F^- 的含量比15陰離子%少時，難以得到上述效果。另一方面，當F^- 的含量超過90陰離子%時，難以維持玻璃的熱穩定性。此外，當F^- 的含量過剩時，顯示出後述的D_NaOH 、D_STPP 、D₀ 的各值增加的傾向。從以上的觀點出發，F^- 的含量為15～90陰離子%。F^- 的含量的較佳的下限為20%，更佳的下限為25%，進一步較佳的下限為28.86%，更進一步較佳的下限為30%，較佳的上限為80%，更佳的上限為70%。F ^-It has the effects of lowering the dispersion of glass and giving abnormal dispersion, lowering the glass transition temperature, and improving the chemical durability. When the content of F ^- is less than 15 anion %, it is difficult to obtain the above effect. On the other hand, when the content of F ^- exceeds 90 anion %, it is difficult to maintain the thermal stability of the glass. In addition, when the content of F ^- is excessive, the values of D _NaOH , D _STPP , and D ₀ described later tend to increase. From the above point of view, F ^- the anion content of 15 to 90%. F ^- a preferred minimum content of 20%, the lower limit is more preferably 25%, more preferably lower limit of 28.86%, and further preferred lower limit is 30% upper limit is preferably 80%, more preferably The upper limit is 70%.

如上述那樣，從降低由於導入Nb⁵⁺ 而導致的從玻璃熔融液中的揮發增大的方面出發，O^2- 的含量相對於P⁵⁺ 和Nb⁵⁺ 的合計含量的莫耳比(O^2- /(P⁵⁺ +Nb⁵⁺ ))為3.0以上。莫耳比(O^2- /(P⁵⁺ +Nb⁵⁺ ))的較佳的下限為3.2。從維持玻璃的熱穩定性的方面出發，莫耳比(O^2- /(P⁵⁺ +Nb⁵⁺ ))的較佳的上限為4.0，更佳的上限為3.8。As described above, from the viewpoint of reducing the increase in volatilization from the glass melt due to the introduction of Nb ⁵⁺ , the molar ratio of O ^2- content to the total content of P ⁵⁺ and Nb ⁵⁺ (O ^2- /(P ⁵⁺ +Nb ⁵⁺ )) is 3.0 or more. The preferred lower limit of the molar ratio (O ^2- /(P ⁵⁺ +Nb ⁵⁺ )) is 3.2. From the viewpoint of maintaining the thermal stability of the glass, the preferred upper limit of the molar ratio (O ^2- /(P ⁵⁺ +Nb ⁵⁺ )) is 4.0, and the more preferred upper limit is 3.8.

鹼土金屬成分即Mg²⁺ 、Ca²⁺ 、Sr²⁺ 及Ba²⁺ 為發揮調節玻璃的黏性、折射率，使熱穩定性提高的作用的成分。為了得到上述效果，較佳鹼土金屬成分的合計含量R²⁺ (Mg²⁺ +Ca²⁺ +Sr²⁺ +Ba²⁺ )為20陽離子%以上，更佳為30%以上，進一步較佳為35%以上。另一方面，由於當鹼土金屬成分的合計含量R²⁺ 過剩時顯示出熱穩定性降低的傾向，因此較佳鹼土金屬成分的合計含量R²⁺ 為50%以下。R²⁺ 更佳的上限為45%，進一步較佳的上限為40%。The alkaline earth metal components, that is, Mg ²⁺ , Ca ²⁺ , Sr ²⁺ and Ba ²⁺ are components that play a role in adjusting the viscosity and refractive index of the glass and improving the thermal stability. In order to obtain the above effect, the total content of the alkaline earth metal components R ²⁺ (Mg ²⁺ +Ca ²⁺ +Sr ²⁺ +Ba ²⁺ ) is preferably 20 cation% or more, more preferably 30% or more, and further preferably More than 35%. On the other hand, when the total content R ^{2+ of the} alkaline earth metal components is excessive, the thermal stability tends to decrease. Therefore, the total content R ²⁺ of the alkaline earth metal components is preferably 50% or less. The more preferable upper limit of R ²⁺ is 45%, and the more preferable upper limit is 40%.

上述光學玻璃也可以包含一種以上的選自La³⁺ 、Gd³⁺ 、Y³⁺ 、Lu³⁺ 及Yb³⁺ 中的稀土成分。抑制玻璃的比重增大的同時並且對於一定的折射率降低色散為前提，La³⁺ 、Gd³⁺ 、Y³⁺ 、Lu³⁺ 及Yb³⁺ 的合計含量(La³⁺ +Gd³⁺ +Y³⁺ +Lu³⁺ +Yb³⁺ )相對於Al³⁺ 的含量的莫耳比((La³⁺ +Gd³⁺ +Y³⁺ +Lu³⁺ +Yb³⁺ )/Al³⁺ )較佳為0.3以下。莫耳比((La³⁺ +Gd³⁺ +Y³⁺ +Lu³⁺ +Yb³⁺ )/Al³⁺ )的更佳的上限為0.2，進一步較佳的上限為0.1。莫耳比((La³⁺ +Gd³⁺ +Y³⁺ +Lu³⁺ +Yb³⁺ )/Al³⁺ )也可以為0。The optical glass may contain one or more rare earth components selected from La ³⁺ , Gd ³⁺ , Y ³⁺ , Lu ³⁺ and Yb ³⁺ . The total content of La ³⁺ , Gd ³⁺ , Y ³⁺ , Lu ³⁺ and Yb ³⁺ (La ³⁺ +Gd ³⁺ + Y ³⁺ +Lu ³⁺ +Yb ³⁺ )Molar ratio relative to the content of Al ³⁺ ((La ³⁺ +Gd ³⁺ +Y ³⁺ +Lu ³⁺ +Yb ³⁺ )/Al ³⁺ ) It is preferably 0.3 or less. The more preferable upper limit of the molar ratio ((La ³⁺ +Gd ³⁺ +Y ³⁺ +Lu ³⁺ +Yb ³⁺ )/Al ³⁺ ) is 0.2, and the more preferable upper limit is 0.1. The molar ratio ((La ³⁺ +Gd ³⁺ +Y ³⁺ +Lu ³⁺ +Yb ³⁺ )/Al ³⁺ ) may also be 0.

接著，對各成分的含量進行說明。Next, the content of each component will be described.

P⁵⁺ 是形成玻璃的網路的必要成分。從良好地維持熱穩定性的方面出發，P⁵⁺ 的含量的較佳的下限為5%，更佳的下限為10%，進一步較佳的下限為20%。從良好地維持化學耐久性，維持低色散性、反常部分色散性的方面出發，P⁵⁺ 的含量的較佳的上限為40%，更佳的上限為38%，進一步較佳的上限為35%。P ⁵⁺ is an essential component of the glass network. From the viewpoint of maintaining good thermal stability, the preferable lower limit of the content of P ⁵⁺ is 5%, the more preferable lower limit is 10%, and the more preferable lower limit is 20%. From the viewpoint of maintaining good chemical durability, maintaining low dispersion and abnormal partial dispersion, the preferred upper limit of the content of P ⁵⁺ is 40%, the more preferred upper limit is 38%, and the further preferred upper limit is 35 %.

Al³⁺ 為發揮使熱穩定性、化學耐久性、加工性提高的作用的必要成分，也發揮提高折射率的作用。從上述的觀點出發，Al³⁺ 的含量的較佳的下限為5%，更佳的下限為7%，進一步較佳的下限為9%，更進一步較佳的下限為11%。從上述的觀點出發，Al³⁺ 的含量的較佳的上限為40%，更佳的上限為38%，進一步較佳的上限為36%，更進一步較佳的上限為34%。Al ³⁺ is an essential component that functions to improve thermal stability, chemical durability, and workability, and also functions to increase the refractive index. From the above viewpoint, the preferable lower limit of the content of Al ³⁺ is 5%, the more preferable lower limit is 7%, the more preferable lower limit is 9%, and the still more preferable lower limit is 11%. From the above viewpoint, the preferred upper limit of the Al ³⁺ content is 40%, the more preferred upper limit is 38%, the further preferred upper limit is 36%, and the further preferred upper limit is 34%.

在以原子%表示的玻璃組成中，O^2- 的含量相對於Al³⁺ 的含量的比O^2- /Al³⁺ 較佳小於12，更佳小於10，進一步較佳小於8。當O^2- 的含量過多時，F^- 的含量相對減少，顯示出玻璃化轉變溫度上升的傾向。另一方面，如上所述，為使熱穩定性、化學耐久性、加工性提高，具有期望的光學特性，Al³⁺ 是有用的成分。為了在充分得到Al³⁺ 的效果的情況下抑制玻璃化轉變溫度的上升，較佳以原子%表示的玻璃組成中的O^2- 的含量相對於Al³⁺ 的含量的比O^2- /Al³⁺ 為上述範圍。從抑制由於Al³⁺ 的含量相對增加而導致的耐失透性降低的觀點出發，關於上述的比O^2- /Al³⁺ 的下限，能夠將例如2以上或3以上作為基準。另外，以原子%表示的玻璃組成中的各成分的含量，可作為將全部陽離子成分和全部陰離子成分的合計含量設為100莫耳%時的將各成分的含量以莫耳百分率表示的值而算出。In the glass composition expressed in atomic %, the ratio of the content of O ^{2- to} the content of Al ³⁺ , O ^2- /Al ^{3+, is} preferably less than 12, more preferably less than 10, and still more preferably less than 8. When the content of O ^2- is excessive, the content of F ^- relatively decreases, and the glass transition temperature tends to increase. On the other hand, as described above, Al ³⁺ is a useful component in order to improve thermal stability, chemical durability, and processability and have desired optical characteristics. In order to suppress the increase in the glass transition temperature when the effect of Al ³⁺ is sufficiently obtained, the ratio of the content of O ^{2- to} the content of Al ³⁺ in the glass composition expressed in atomic% is preferably O ^2- /Al ³⁺ is the above range. From suppressing devitrification resistance decreases viewpoint since the content of Al ³⁺ caused by relative increase, regarding the lower limit of the above ratio O ^2- / Al ^3+, it is possible for example, 2 or more, or 3 or more as a reference. In addition, the content of each component in the glass composition expressed in atomic% can be regarded as a value expressed as a percentage of the molar content when the total content of all cationic components and all anionic components is set to 100 mol% Figure it out.

Mg²⁺ 、Ca²⁺ 、Sr²⁺ 、Ba²⁺ 的各成分的較佳的含量如下所述。 Mg²⁺ 的含量的較佳的範圍為0～10%，更佳的範圍為0～8%。 Ca²⁺ 的含量的較佳的範圍為0～20%，更佳的範圍為0～15%。 Sr²⁺ 的含量的較佳的範圍為0～40%，更佳的範圍為0～30%。 Ba²⁺ 的含量的較佳的下限為5%，更佳的下限為10%，較佳的上限為50%，更佳的上限為40%。The preferable content of each component of Mg ²⁺ , Ca ²⁺ , Sr ²⁺ , Ba ²⁺ is as follows. The preferable range of the content of Mg ²⁺ is 0 to 10%, and the more preferable range is 0 to 8%. The preferable range of the content of Ca ²⁺ is 0-20%, and the more preferable range is 0-15%. The preferable range of the content of Sr ²⁺ is 0 to 40%, and the more preferable range is 0 to 30%. The preferred lower limit of the Ba ²⁺ content is 5%, the more preferred lower limit is 10%, the preferred upper limit is 50%, and the more preferred upper limit is 40%.

La³⁺ 、Gd³⁺ 、Y³⁺ 、Lu³⁺ 的各較佳的含量如下所述。 La³⁺ 的含量的較佳的範圍為0～5%，更佳的範圍為0～3%。 Gd³⁺ 的含量的較佳的範圍為0～5%，更佳的範圍為0～3%。 Y³⁺ 的含量的較佳的範圍為0～5%，更佳的範圍為0～3%。 Lu³⁺ 的含量的較佳的範圍為0～5%，更佳的範圍為0～3%。The preferable contents of La ³⁺ , Gd ³⁺ , Y ³⁺ and Lu ³⁺ are as follows. The preferable range of the content of La ³⁺ is 0 to 5%, and the more preferable range is 0 to 3%. The preferable range of the content of Gd ³⁺ is 0 to 5%, and the more preferable range is 0 to 3%. The preferable range of the content of Y ³⁺ is 0 to 5%, and the more preferable range is 0 to 3%. The preferable range of the content of Lu ³⁺ is 0 to 5%, and the more preferable range is 0 to 3%.

Yb³⁺ 由於在紅外區域具有光吸收，因此不較佳用於基於紅外光的成像。因此，Yb³⁺ 的含量較佳使用與其他稀土成分的合計含量的莫耳比(Yb³⁺ /(La³⁺ +Gd³⁺ +Y³⁺ +Lu³⁺ +Yb³⁺ ))按照以下的方法進行限制。亦即，較佳將Yb³⁺ 的含量相對於La³⁺ 、Gd³⁺ 、Y³⁺ 、Lu³⁺ 及Yb³⁺ 的合計含量的莫耳比(Yb³⁺ /(La³⁺ +Gd³⁺ +Y³⁺ +Lu³⁺ +Yb³⁺ ))設為0.5以下，更佳設為0.1以下，進一步較佳設為0(Yb³⁺ 的含量為0%)。Since Yb ³⁺ has light absorption in the infrared region, it is not preferred for imaging based on infrared light. Therefore, for the content of Yb ³⁺ , it is preferable to use the molar ratio (Yb ³⁺ /(La ³⁺ +Gd ³⁺ +Y ³⁺ +Lu ³⁺ +Yb ³⁺ )) of the total content with other rare earth components according to the following Method. That is, the preferred content of the Yb ³⁺ molar ratio of the total content of ^{^{^{La 3+, Gd 3+, Y 3+}}} , Lu 3+ and Yb ³⁺ is ^{^{(Yb 3+ / (La 3+ +}} Gd ³⁺ +Y ³⁺ +Lu ³⁺ +Yb ³⁺ )) is set to 0.5 or less, more preferably 0.1 or less, and even more preferably 0 (the content of Yb ³⁺ is 0%).

Zn²⁺ 具有在維持折射率的情況下使熱穩定性提高的作用。但當過量含有時，色散變高，難以得到期望的光學特性。因此，Zn²⁺ 的含量較佳設為0～10%的範圍。為了得到上述效果，Zn²⁺ 的含量的更佳的上限為8%，進一步較佳的上限為5%。Zn²⁺ 的含量也可以為0%。Zn ²⁺ has the effect of improving thermal stability while maintaining the refractive index. However, when excessively contained, the dispersion becomes high, making it difficult to obtain desired optical characteristics. Therefore, the content of Zn ²⁺ is preferably in the range of 0 to 10%. In order to obtain the above effect, the more preferable upper limit of the content of Zn ²⁺ is 8%, and the more preferable upper limit is 5%. The content of Zn ²⁺ may also be 0%.

鹼金屬成分為具有調節玻璃的黏性、使熱穩定性提高的作用的陽離子成分。當鹼金屬成分的合計含量R⁺ 過剩時，熱穩定性降低。因此，鹼金屬成分的合計含量R⁺ 的較佳的範圍為0～30%。從上述的觀點出發，R⁺ 的更佳的範圍為0～20%，進一步較佳的範圍為0～15%。R⁺ 的上限進一步較佳為10%，更進一步較佳為8%，更進一步較佳為7%。此外，當鹼金屬成分的合計含量R⁺ 過剩時，後述的D_STPP 和D₀ 的各值顯示出增加的傾向。因此，從對玻璃賦予優異的化學耐久性的方面出發，R⁺ 較佳為上述的範圍。另一方面，從降低玻璃化轉變溫度的觀點出發，R⁺ 的較佳的下限為1%，更佳的下限為2%，進一步較佳的下限為3%。作為鹼金屬成分R⁺ ，能夠示出Li⁺ 、Na⁺ 、K⁺ 、Rb⁺ 、Cs⁺ 。Rb⁺ 、Cs⁺ 與其它鹼金屬成分相比，易於引起玻璃的比重增大。因此，Rb⁺ 的含量較佳為0～3%，更佳為0～2%，進一步較佳為0～1%，也可以為0%。 Cs⁺ 的含量較佳為0～3%，更佳為0～2%，進一步較佳為0～1%，也可以為0%。從維持玻璃的熱穩定性的方面出發，Li⁺ 的含量的較佳的範圍為0～30%，更佳的範圍為2～20%，進一步較佳的範圍為4～10%。從維持玻璃的熱穩定性的方面出發，Na⁺ 的含量的較佳的範圍為0～10%，更佳的範圍為0～8%，進一步較佳的範圍為0～6%。從維持玻璃的熱穩定性的方面出發，K⁺ 的含量的較佳的範圍為0～10%，更佳的範圍為0～8%，進一步較佳的範圍為0～6%。The alkali metal component is a cationic component that has a function of adjusting the viscosity of glass and improving thermal stability. When the total content R ^{+ of the} alkali metal components becomes excessive, the thermal stability decreases. Therefore, the preferable range of the total content R ⁺ of the alkali metal components is 0 to 30%. From the above viewpoint, the more preferable range of R ⁺ is 0 to 20%, and the more preferable range is 0 to 15%. The upper limit of R ⁺ is further preferably 10%, still more preferably 8%, still more preferably 7%. In addition, when the total content R ^{+ of the} alkali metal components is excessive, the values of D _STPP and D ₀ described later tend to increase. Therefore, from the viewpoint of imparting excellent chemical durability to the glass, R ^{+ is} preferably within the above range. On the other hand, from the viewpoint of lowering the glass transition temperature, the preferred lower limit of R ⁺ is 1%, the more preferred lower limit is 2%, and the more preferred lower limit is 3%. As the alkali metal component R ⁺ , Li ⁺ , Na ⁺ , K ⁺ , Rb ⁺ , and Cs ⁺ can be shown. Rb ⁺ and Cs ⁺ tend to increase the specific gravity of glass compared to other alkali metal components. Therefore, the content of Rb ⁺ is preferably 0 to 3%, more preferably 0 to 2%, still more preferably 0 to 1%, or 0%. The content of Cs ⁺ is preferably 0 to 3%, more preferably 0 to 2%, still more preferably 0 to 1%, or 0%. From the viewpoint of maintaining the thermal stability of the glass, the preferred range of the content of Li ⁺ is 0 to 30%, the more preferred range is 2 to 20%, and the further preferred range is 4 to 10%. From the viewpoint of maintaining the thermal stability of the glass, the preferable range of the content of Na ⁺ is 0 to 10%, the more preferable range is 0 to 8%, and the more preferable range is 0 to 6%. From the viewpoint of maintaining the thermal stability of the glass, the content of K ⁺ is preferably in the range of 0 to 10%, more preferably in the range of 0 to 8%, and even more preferably in the range of 0 to 6%.

Si⁴⁺ 當少量時也能夠含有，但如果使其含有過量，則熔融性、熱穩定性降低。因此，Si⁴⁺ 的含量較佳設為0～5%的範圍，更佳設為0～3%的範圍，進一步較佳設為0～1%的範圍，也可以設為0%。Si ⁴⁺ can be contained in a small amount, but if it is contained in an excessive amount, the meltability and thermal stability are reduced. Therefore, the content of Si ⁴⁺ is preferably in the range of 0 to 5%, more preferably in the range of 0 to 3%, even more preferably in the range of 0 to 1%, or may be 0%.

B³⁺ 即使少量含有也顯示出顯著的揮發性。為了不助長揮發，較佳將B³⁺ 的含量設為2%以下。B³⁺ 的含量的較佳的範圍為0～1%，更佳的範圍為0～0.1%，進一步較佳為0%。B ³⁺ shows significant volatility even if it is contained in small amounts. In order not to promote volatilization, the content of B ³⁺ is preferably 2% or less. The preferred range of the content of B ³⁺ is 0 to 1%, the more preferred range is 0 to 0.1%, and the more preferred range is 0%.

在熔融玻璃從安裝於玻璃熔融裝置的管中流出時，為了抑制玻璃熔融液向管外周的潤濕、抑制由於潤濕而導致的玻璃的品質降低，含有Cl^- 是有效的。Cl^- 的含量的較佳的範圍為0～1%，更佳的範圍為0～0.5%，進一步較佳的範圍為0～0.3%。Cl^- 也具有作為澄清劑的效果。When molten glass flows out of a tube installed in a glass melting device, it is effective to contain Cl ⁻ in order to suppress the wetting of the glass melt to the outer periphery of the tube and the quality of the glass due to wetting. The preferred range of the content of Cl ^- is 0 to 1%, the more preferred range is 0 to 0.5%, and the further preferred range is 0 to 0.3%. Cl ^- also has an effect as a clarifying agent.

除此以外，也能夠少量添加Sb³⁺ 、Ce⁴⁺ 等作為澄清劑。澄清劑的總量能夠為0%以上，較佳設為小於1%。例如，Sb³⁺ 和Ce⁴⁺ 的合計含量能夠為0%以上，較佳小於1%。In addition to this, it is also possible to add Sb ³⁺ , Ce ⁴⁺ and the like as a clarifying agent in a small amount. The total amount of clarifying agent can be 0% or more, preferably less than 1%. For example, the total content of Sb ³⁺ and Ce ⁴⁺ can be 0% or more, preferably less than 1%.

Pb、Cd、As、Th為擔心造成環境負擔的成分。因此，上述光學玻璃1較佳實質上不包含Pb、Cd、As及Th中的至少一種。 Pb²⁺ 的含量較佳為0～0.5%，更佳為0～0.1%，進一步較佳為0～0.05%，特別較佳實質上不包含Pb²⁺ 。 Cd²⁺ 的含量較佳為0～0.5%，更佳為0～0.1%，進一步較佳為0～0.05%，特別較佳實質上不包含Cd²⁺ 。 As³⁺ 的含量較佳為0～0.1%，更佳為0～0.05%，進一步較佳為0～0.01%，特別較佳實質上不包含As³⁺ 。 Th⁴⁺ 的含量較佳為0～0.1%，更佳為0～0.05%，進一步較佳為0～0.01%，特別較佳實質上不包含Th⁴⁺ 。Pb, Cd, As, Th are components that worry about environmental burden. Therefore, the optical glass 1 preferably does not substantially include at least one of Pb, Cd, As, and Th. The content of Pb ²⁺ is preferably 0 to 0.5%, more preferably 0 to 0.1%, still more preferably 0 to 0.05%, and particularly preferably does not substantially contain Pb ²⁺ . The content of Cd ²⁺ is preferably 0 to 0.5%, more preferably 0 to 0.1%, still more preferably 0 to 0.05%, and particularly preferably does not substantially contain Cd ²⁺ . The content of As ³⁺ is preferably 0 to 0.1%, more preferably 0 to 0.05%, still more preferably 0 to 0.01%, and particularly preferably does not substantially include As ³⁺ . The content of Th ⁴⁺ is preferably 0 to 0.1%, more preferably 0 to 0.05%, still more preferably 0 to 0.01%, and particularly preferably does not substantially include Th ⁴⁺ .

上述光學玻璃1較佳能夠在整個可見光區域的寬範圍顯示高的透射率。為了有效利用這樣的優勢，較佳上述光學玻璃不包含著色劑。作為著色劑，能夠例示Cu、Co、Ni、Fe、Cr、Eu、Nd、Er、V等。上述光學玻璃1較佳實質上不包含Cu、Co、Ni、Fe、Cr、Eu、Nd、Er及V中的至少一種。以陽離子%表示的Cu、Co、Ni、Fe、Cr、Eu、Nd、Er、V的含量的範圍任一元素均較佳小於100ppm，更佳為0～80ppm，進一步較佳為0～50ppm以下，特別較佳實質上不包含。在此，ppm為陽離子ppm。此外，Hf、Ga、Ge、Te、Tb為昂貴的成分。因此，光學玻璃1較佳實質上不包含Hf、Ga、Ge、Te及Tb中的至少一種。以陽離子%表示的Hf、Ga、Ge、Te、Tb的含量的範圍任一元素均較佳為0～0.1%，更佳為0～0.05%，進一步較佳為0～0.01%，更進一步較佳為0～0.005%，更進一步較佳為0～0.001%，特別較佳實質上不包含。上述光學玻璃能夠在不導入Hf、Ga、Ge、Te、Tb的情況下顯示出各種特性。The above-mentioned optical glass 1 is preferably capable of displaying high transmittance over a wide range of visible light. In order to effectively utilize such advantages, it is preferable that the optical glass does not contain a colorant. As the colorant, Cu, Co, Ni, Fe, Cr, Eu, Nd, Er, V, etc. can be exemplified. The optical glass 1 preferably does not substantially contain at least one of Cu, Co, Ni, Fe, Cr, Eu, Nd, Er, and V. Any element in the content range of Cu, Co, Ni, Fe, Cr, Eu, Nd, Er, V expressed as cation% is preferably less than 100 ppm, more preferably 0 to 80 ppm, and even more preferably 0 to 50 ppm or less , It is particularly preferably not substantially included. Here, ppm is cation ppm. In addition, Hf, Ga, Ge, Te, and Tb are expensive components. Therefore, the optical glass 1 preferably does not substantially include at least one of Hf, Ga, Ge, Te, and Tb. Any element in the content range of Hf, Ga, Ge, Te, and Tb expressed as cation% is preferably 0 to 0.1%, more preferably 0 to 0.05%, further preferably 0 to 0.01%, and further It is preferably 0 to 0.005%, further preferably 0 to 0.001%, and particularly preferably does not substantially include. The above-mentioned optical glass can exhibit various characteristics without introducing Hf, Ga, Ge, Te, or Tb.

＜玻璃特性＞ (阿貝數νd、折射率nd) 在上述光學玻璃1中，從有效利用反常部分色散性的方面出發，阿貝數νd較佳為45以上的範圍。阿貝數νd為表示與分散有關的性質的值，使用d線、F線、C線處的各折射率nd、nF、nC，表示為νd＝(nd-1)/(nF-nC)。阿貝數νd的較佳的上限為80，更佳的上限為70。另一方面，為了有效利用低色散性，阿貝數νd的較佳的下限為45，更佳的下限為50，進一步較佳的下限為55。<Glass characteristics> (Abbe number νd, refractive index nd) In the above-mentioned optical glass 1, the Abbe number νd is preferably in the range of 45 or more from the viewpoint of effective use of anomalous partial dispersion. The Abbe number νd is a value indicating a property related to dispersion, and each refractive index nd, nF, nC at the d-line, F-line, and C-line is used, and is expressed as νd=(nd-1)/(nF-nC). The preferable upper limit of the Abbe number νd is 80, and the more preferable upper limit is 70. On the other hand, in order to effectively use the low dispersion, the lower limit of the Abbe number νd is preferably 45, the more preferable lower limit is 50, and the more preferable lower limit is 55.

進而，藉由使折射率nd為以下的範圍，從而能夠在具有同等的聚光力的情況下，使透鏡的光學功能面的曲率的絕對值減少(緩和棱鏡的光學功能面的彎曲)。無論是精密壓製成型還是研磨、拋光，透鏡的光學功能面的彎曲越緩和則越容易進行製作，因此藉由使用高折射率的玻璃從而能夠提高光學元件的生產率。進而，藉由提高折射率，也能夠提供適合於用於高功能、緊湊的光學體系中的光學元件的玻璃材料。在上述光學玻璃1中，較佳的折射率nd的範圍為滿足下述(2)式的範圍，更佳的折射率nd的範圍為滿足下述(3)式的範圍。 nd≥1.80653-0.00459×νd ・・・(2)式 nd≥1.84303-0.00459×νd ・・・(3)式Furthermore, by setting the refractive index nd to the following range, the absolute value of the curvature of the optical functional surface of the lens can be reduced (to reduce the curvature of the optical functional surface of the prism) with the same converging power. Regardless of precision press molding, grinding, or polishing, the gentler the bending of the optical functional surface of the lens, the easier it is to manufacture. Therefore, the use of high refractive index glass can increase the productivity of optical elements. Furthermore, by increasing the refractive index, it is possible to provide a glass material suitable for an optical element in a high-function, compact optical system. In the above-mentioned optical glass 1, the preferable range of the refractive index nd is a range satisfying the following formula (2), and the more preferable range of the refractive index nd is a range satisfying the following formula (3). nd≥1.80653-0.00459×νd formula (2) nd≥1.84303-0.00459×νd formula (3)

在圖1中，圖示了(2)式和(3)式中各自等號成立時的式子。上述光學玻璃1較佳顯示出正的異常色散性。異常色散性可使用ΔPg,F定量地表示。部分分散比Pg,F可使用g線、F線、C線處的各折射率ng、nF、nC，藉由先前所示的(1)式(Pg,F＝(ng-nF)/(nF-nC))而算出。作為阿貝數νd為45以上的市售的低色散玻璃，已知有HOYA制FCD100、FCD515等。在將橫軸設為阿貝數νd、縱軸設為部分分散比Pg,F的圖中，在坐標(95.1 0.5334)處對FCD100進行作圖，在坐標(68.63 0.5441)處對FCD515進行作圖，研究連接上述2點的直線L。該直線L大致可表示為「Pg,F＝-0.0004νd+0.5718」。在圖2中圖示了直線L。如圖2所示的那樣，阿貝數νd為45以上的市售的低色散玻璃(現有的玻璃)在阿貝數νd-部分分散比Pg,F的圖中位於直線L的線上或部分分散比Pg,F比直線L小的一側。就上述光學玻璃1而言，在較佳的實施態樣中，阿貝數νd和部分分散比Pg,F滿足下述(4)式。 Pg,F＞-0.0004νd+0.5718 ・・・(4)式阿貝數νd為45以上且滿足上述(4)式的光學玻璃，相對於特定的阿貝數νd，部分分散比Pg,F大，適合作為高階的色像差校正用的光學玻璃。In FIG. 1, the equations when the equal signs in equations (2) and (3) are established are shown. The optical glass 1 preferably exhibits positive abnormal dispersion. Abnormal dispersion can be expressed quantitatively using ΔPg, F. For the partial dispersion ratio Pg, F, the refractive indexes ng, nF, nC at the g-line, F-line, and C-line can be used, according to the equation (1) shown previously (Pg,F=(ng-nF)/(nF -nC)). As commercially available low-dispersion glass having an Abbe number νd of 45 or more, HOYA FCD100, FCD515 and the like are known. In a graph where the horizontal axis is Abbe number νd and the vertical axis is the partial dispersion ratio Pg, F, the FCD100 is plotted at the coordinate (95.1 0.5334), and the FCD515 is plotted at the coordinate (68.63 0.5441). , Study the straight line L connecting the above two points. The straight line L can be roughly expressed as "Pg,F=-0.0004νd+0.5718". The straight line L is illustrated in FIG. 2. As shown in FIG. 2, a commercially available low-dispersion glass (existing glass) having an Abbe number νd of 45 or more is located on the line or part of the line L in the graph of Abbe number νd-partial dispersion ratio Pg,F The side smaller than Pg and F is smaller than the straight line L. As for the optical glass 1 described above, in a preferred embodiment, the Abbe number νd and the partial dispersion ratio Pg,F satisfy the following formula (4). Pg,F＞-0.0004νd+0.5718 ・···················································································································································································· , Suitable for high-order chromatic aberration correction optical glass.

(透射率) 上述光學玻璃1較佳為著色極少，適合作為相機鏡頭等成像用的光學元件、投影儀等投射用的光學元件的材料。上述光學玻璃1的較佳的態樣為波長400nm～700nm、厚度10mm時的內部透射率為96.5%以上的玻璃。上述內部透射率的較佳的範圍為97%以上，進一步較佳的範圍為98%以上，更進一步較佳的範圍為99%以上。另外，雷射光用玻璃等包含發光離子例如Nd、Eu、Er、V等的玻璃，由於在可見光區域具有吸收，因此不適合用於相機鏡頭等成像用的光學元件、投影儀等投射用的光學元件的材料。(Transmittance) The optical glass 1 preferably has very little coloring, and is suitable as a material for imaging optical elements such as camera lenses and projection optical elements such as projectors. A preferable aspect of the above-mentioned optical glass 1 is glass having an internal transmittance of 96.5% or more at a wavelength of 400 nm to 700 nm and a thickness of 10 mm. The preferable range of the internal transmittance is 97% or more, the more preferable range is 98% or more, and the still more preferable range is 99% or more. In addition, glass for laser light, etc., which contains light-emitting ions such as Nd, Eu, Er, V, etc., has absorption in the visible light region, so it is not suitable for optical elements for imaging such as camera lenses and projection optical elements such as projectors. s material.

(玻璃轉換溫度Tg) 上述光學玻璃1的較佳的方式為玻璃轉換溫度Tg為550℃以下的光學玻璃。當玻璃轉換溫度低時，能夠降低將玻璃再加熱、軟化而進行壓製成型時的加熱溫度。其結果是易於抑制玻璃和壓製成型模具的熔接。此外，由於能夠降低加熱溫度，因此也能夠減少玻璃的加熱裝置、壓製成型模具等的熱消耗。進而，還能夠降低玻璃的退火溫度，因此能夠延長退火爐的壽命。玻璃轉換溫度的更佳的範圍為530℃以下，進一步較佳的範圍為500℃以下。(Glass transition temperature Tg) A preferable aspect of the optical glass 1 is an optical glass having a glass transition temperature Tg of 550°C or lower. When the glass transition temperature is low, the heating temperature when the glass is reheated and softened for press molding can be reduced. As a result, it is easy to suppress welding of the glass and the press mold. In addition, since the heating temperature can be reduced, the heat consumption of the glass heating device, the press mold, and the like can also be reduced. Furthermore, the annealing temperature of the glass can be lowered, so the life of the annealing furnace can be extended. The more preferable range of the glass transition temperature is 530°C or lower, and the more preferable range is 500°C or lower.

(液相溫度) 上述光學玻璃1的較佳的方式為液相溫度為850℃以下的光學玻璃。當液相溫度低時，能夠使玻璃的熔融、成型溫度降低。其結果是，能夠降低熔融、成型時的玻璃的揮發性，能夠抑制條紋的產生、光學特性的變動。液相溫度的更佳的範圍為800℃以下，進一步較佳的範圍為750℃以下。(Liquid phase temperature) A preferable embodiment of the optical glass 1 is an optical glass with a liquid phase temperature of 850°C or lower. When the liquidus temperature is low, the melting and forming temperature of the glass can be reduced. As a result, it is possible to reduce the volatility of the glass during melting and molding, and to suppress the occurrence of streaks and changes in optical characteristics. The more preferable range of the liquidus temperature is 800°C or lower, and the more preferable range is 750°C or lower.

(比重) 上述光學玻璃1能夠不依賴於雖可使部分分散比增加但也使比重增加的稀土，而是主要藉由含有Nb⁵⁺ 而提高部分分散比，在部分分散比大的氟磷酸鹽玻璃中比重相對較小。上述光學玻璃1的較佳的方式為比重為4.2以下的光學玻璃。藉由減小比重，從而能夠將光學元件輕質化。比重的更佳的範圍為4.1以下，進一步較佳的範圍為4以下。(Specific gravity) The above-mentioned optical glass 1 can not depend on the rare earth that can increase the partial dispersion ratio but also increase the specific gravity, but mainly improves the partial dispersion ratio by containing Nb ^5+, and the fluorophosphate with a large dispersion ratio in the partial The specific gravity in glass is relatively small. A preferred embodiment of the optical glass 1 is an optical glass having a specific gravity of 4.2 or less. By reducing the specific gravity, the optical element can be reduced in weight. The more preferable range of specific gravity is 4.1 or less, and the more preferable range is 4 or less.

[光學玻璃2] 以下，對本發明的一實施態樣的光學玻璃2進行說明。[Optical Glass 2] Hereinafter, an optical glass 2 according to an embodiment of the present invention will be described.

＜玻璃特性＞上述光學玻璃2的阿貝數νd和部分分散比Pg,F滿足下述(4)式。 Pg,F＞-0.0004νd+0.5718 ・・・(4) 阿貝數νd和部分分散比Pg,F滿足上述(4)式的上述光學玻璃2適合作為高階的色像差校正用的光學玻璃。此外，在上述光學玻璃2中，從有效利用反常部分色散性的方面出發，較佳阿貝數νd為45以上的範圍。阿貝數νd的較佳的上限為80，更佳的上限為70。另一方面，為了有效利用低色散性，阿貝數νd的更佳的下限為50，進一步較佳的下限為55。<Glass characteristics> The Abbe number νd and partial dispersion ratios Pg and F of the optical glass 2 satisfy the following formula (4). Pg,F>-0.0004νd+0.5718 (4) Abbe number νd and partial dispersion ratio Pg,F The above-mentioned optical glass 2 satisfying the above formula (4) is suitable as an optical glass for high-order chromatic aberration correction. In addition, in the optical glass 2 described above, it is preferable that the Abbe number νd is in the range of 45 or more from the viewpoint of effective use of abnormal partial dispersion. The preferable upper limit of the Abbe number νd is 80, and the more preferable upper limit is 70. On the other hand, in order to effectively use low dispersion, the lower limit of the Abbe number νd is more preferably 50, and the more preferable lower limit is 55.

＜化學耐久性＞ (D_NaOH ) 上述光學玻璃2具有浸漬於NaOH水溶液中15小時情況下的每單位面積的質量減少量D_NaOH 小於0.25mg/(cm² ・15h)的化學耐久性。上述質量減少量D_NaOH 可藉由以下的方法而求得。首先，準備直徑43.7mm、厚5mm的圓板狀的玻璃試樣。直徑43.7mm的相對的2個表面被雙面拋光，對於側面，藉由貼合對下述的氫氧化鈉(NaOH)的水溶液具有化學耐久性的膠帶(例如，聚醯亞胺膠帶等)等的方法進行掩蔽。因此，圓板狀的玻璃試樣的上述2個表面被暴露在下述的氫氧化鈉(NaOH)的水溶液中。這2個表面的面積的合計(以下，記為「玻璃試樣的表面積」。)為30cm² 。接著，測定玻璃試樣的質量M_before 後，在液體溫度50℃、濃度0.01 mol/l的充分攪拌的氫氧化鈉(NaOH)的水溶液中浸漬玻璃試樣15小時，測定浸漬後的玻璃試樣的質量M_after 。浸漬前後的質量差(M_before ‐M_after )(單位：mg)除以玻璃試樣的表面積的值為D_NaOH 。亦即，藉由「(M_before ‐M_after )/30」而求得的值為D_NaOH 。上述光學玻璃2具有D_NaOH 小於0.25mg/(cm² ・15h)的化學耐久性。根據具有上述範圍的D_NaOH 的光學玻璃，能夠抑制由於潛在傷痕的顯現等而發生表面品質的降低。從維持高的表面品質的方面出發，D_NaOH 較佳小於0.20mg/(cm² ・15h)，更佳小於0.10mg/(cm² ・15h)。D_NaOH 的下限沒有特別限定，能夠考慮將例如0.02mg/(cm² ・15h)以上作為基準。<Chemical Durability> (D _NaOH ) The optical glass 2 has a chemical durability in which the mass reduction per unit area D _{NaOH is} less than 0.25 mg/(cm ² ·15h) when immersed in an aqueous NaOH solution for 15 hours. The mass reduction amount D _NaOH can be obtained by the following method. First, a disk-shaped glass sample having a diameter of 43.7 mm and a thickness of 5 mm is prepared. The opposing two surfaces with a diameter of 43.7 mm are double-sided polished, and the side surfaces are bonded with a tape (for example, polyimide tape, etc.) that has chemical durability against the following aqueous solution of sodium hydroxide (NaOH) Method of masking. Therefore, the two surfaces of the disk-shaped glass sample are exposed to the aqueous solution of sodium hydroxide (NaOH) described below. The total area of these two surfaces (hereinafter referred to as "surface area of glass sample") is 30 cm ² . Next, after measuring the mass M _before of the glass sample, the glass sample was immersed in a sufficiently stirred aqueous solution of sodium hydroxide (NaOH) at a liquid temperature of 50° C. and a concentration of 0.01 mol/l for 15 hours, and the glass sample after immersion was measured The quality of M _after . The value of the mass difference _{before and} _after immersion (M _before- M _after ) (unit: mg) divided by the surface area of the glass sample is D _NaOH . That is, the value obtained by "(M _before ‐M _after )/30" is D _NaOH . The optical glass 2 has a chemical durability of D _{NaOH of} less than 0.25 mg/(cm ² ·15h). According to the optical glass having D _NaOH in the above-mentioned range, it is possible to suppress the deterioration of the surface quality due to the appearance of potential scratches and the like. From the viewpoint of maintaining high surface quality, D _{NaOH is} preferably less than 0.20 mg/(cm ² ·15h), and more preferably less than 0.10 mg/(cm ² ·15h). The lower limit of D _NaOH is not particularly limited, and for example, 0.02 mg/(cm ² ·15h) or more can be considered as a reference.

(關於D_A ) 上述光學玻璃2較佳具有D_A 小於0.35%的化學耐久性。 D_A 按照日本光學玻璃工業協會標準JOGIS06-2009規定的耐酸性重量減少率Da的測定方法來測定。具體而言，測定方法如下所述。將與比重相當的質量(M_before 、單位：g)的粉末玻璃(粒度425μm～600μm)放入鉑筐中，將其浸漬在石英玻璃製圓底燒瓶內的80ml的濃度0.01 mol/l的硝酸水溶液中，在沸騰水溶中處理60分鐘，測定該處理後的粉末玻璃的質量M_after (單位：g)。將上述處理前後的粉末玻璃的質量差除以處理前的粉末玻璃的質量的值(M_before ‐M_after )/M_before 以百分比表示的結果[(M_before ‐M_after )/M_before ]×100為D_A 。具有上述範圍的D_A 的光學玻璃適合作為要求優異耐酸性的屋外設置的監控攝影機、車載攝影機所配備的光學元件用的玻璃材料。 D_A 的下限沒有特別限定，能夠考慮將例如0.20%以上作為基準。(Regarding D _A ) The optical glass 2 preferably has a chemical durability with D _{A of} less than 0.35%. D _{A is} measured in accordance with the method for measuring the acid resistance weight loss rate Da specified by the Japan Optical Glass Industry Association Standard JOGIS06-2009. Specifically, the measurement method is as follows. Put powder glass (particle size 425 μm to 600 μm) of mass (M _before , unit: g) equivalent to specific gravity into a platinum basket, and immerse it in 80 ml of nitric acid with a concentration of 0.01 mol/l in a quartz glass round bottom flask aqueous solution, 60 minutes in a boiling water bath, the mass M _after the glass powder after the treatment (unit: g). The result of dividing the mass difference of the powder glass before and after the above treatment by the mass of the powder glass before the treatment (M _before ‐M _after )/M _before as a percentage [(M _before ‐M _after )/M _before ]×100 Is D _A. The optical glass having D _A in the above range is suitable as a glass material for optical elements provided in surveillance cameras and vehicle-mounted cameras installed outdoors requiring excellent acid resistance. The lower limit of D _A is not particularly limited, and for example, 0.20% or more can be considered as a reference.

(關於D_STPP ) 上述光學玻璃2較佳具有D_STPP 小於0.40mg/(cm² ・h)的化學耐久性。 D_STPP 的測定方法如下所述。首先，準備直徑43.7mm、厚5mm的圓板狀的玻璃試樣。直徑43.7mm的相對的2個表面被雙面拋光，對於側面，藉由貼合對下述的三聚磷酸鈉的水溶液具有化學耐久性的膠帶(例如，聚醯亞胺膠帶等)等的方法進行掩蔽。因此，圓板狀的玻璃試樣的上述2個表面被暴露在下述的三聚磷酸鈉的水溶液中。這2個表面的面積的合計(玻璃試樣的表面積)為30cm² 。接著，測定玻璃試樣的質量M_before 後，在液體溫度50℃、濃度0.01 mol/l的充分攪拌的三聚磷酸鈉(Na₅ P₃ O₁₀ )的水溶液中浸漬1小時，測定浸漬後的玻璃試樣的質量M_after 。將浸漬前後的質量差(M_before ‐M_after )(單位：mg)除以玻璃試樣的表面積和浸漬時間的值設為D_STPP 。亦即，藉由「(M_before ‐M_after )/(30×1)」而求得的值為D_STPP 。上述光學玻璃2更佳具有D_STPP 小於0.20mg/(cm² ・h)的化學耐久性。D_STPP 的下限沒有特別限定，能夠考慮將例如0.02mg/(cm² ・h)以上作為基準。藉由使D_STPP 為上述範圍內，從而能夠更進一步抑制發生表面品質的降低。(Regarding D _STPP ) The optical glass 2 preferably has a chemical durability of D _{STPP of} less than 0.40 mg/(cm ² ·h). The measurement method of D _STPP is as follows. First, a disk-shaped glass sample having a diameter of 43.7 mm and a thickness of 5 mm is prepared. The opposing two surfaces with a diameter of 43.7 mm are double-sided polished, and on the sides, a method of attaching a tape (for example, polyimide tape, etc.) that has chemical durability to the following aqueous solution of sodium tripolyphosphate is applied Masking. Therefore, the two surfaces of the disk-shaped glass sample were exposed to the aqueous solution of sodium tripolyphosphate described below. The total area of these two surfaces (surface area of the glass sample) is 30 cm ² . Next, after measuring the mass M _before of the glass sample, it was immersed in a well-stirred aqueous solution of sodium tripolyphosphate (Na ₅ P ₃ O ₁₀ ) at a liquid temperature of 50° C. and a concentration of 0.01 mol/l for 1 hour. The quality of the glass sample M _after . The value of the mass difference (M _before- M _after ) _{before and} _after immersion (unit: mg) divided by the surface area of the glass sample and the immersion time was defined as D _STPP . That is, the value obtained by "(M _before- M _after )/(30×1)" is D _STPP . The optical glass 2 preferably has a chemical durability with a D _{STPP of} less than 0.20 mg/(cm ² ·h). The lower limit of D _STPP is not particularly limited, and for example, 0.02 mg/(cm ² ·h) or more can be considered as a reference. By setting D _STPP to be within the above range, it is possible to further suppress the occurrence of a decrease in surface quality.

關於光學玻璃2的其它的玻璃特性，能夠將關於光學玻璃1所記載的上述各種事項的1個或2個以上任意組合而應用。此外，關於光學玻璃1的玻璃特性，能夠將關於光學玻璃2所記載的上述各種事項的1個或2個以上任意組合而應用。With regard to other glass characteristics of the optical glass 2, any one or more of the above-mentioned various matters described for the optical glass 1 can be applied in any combination. In addition, regarding the glass characteristics of the optical glass 1, any one or more of the above-mentioned various matters described for the optical glass 2 can be applied in any combination.

(D₀ ) 在上述光學玻璃2中，較佳D₀ 小於5.0×10^-3 mg / (cm² ・h)。D₀ 有時也稱為在水中的真正的化學耐久性。 D₀ 的測定方法如下所述。首先，準備直徑43.7mm、厚5mm的圓板狀的玻璃試樣。直徑43.7mm的相對的2個表面被雙面拋光，對於側面，藉由貼合對下述的純水具有化學耐久性的膠帶(例如，聚醯亞胺膠帶等)等的方法進行掩蔽。因此，圓板狀的玻璃試樣的上述2個表面被暴露在下述的純水中。這2個表面的面積的合計(玻璃試樣的表面積)為30cm² 。接著，測定玻璃試樣的質量M_before 後，將玻璃試樣浸漬在以每分鐘1升的速度藉由離子交換樹脂進行循環、保持在水溫50℃、pH＝7.0±0.2、充分攪拌的純水中。測定在上述純水中浸漬20小時以上(較佳40小時以上)後的玻璃試樣的質量M_after 。將浸漬前後的質量差(M_before ‐M_after )(單位：mg)除以玻璃試樣的表面積和浸漬時間的值設為D₀ 。亦即，藉由「(M_before ‐M_after )/(30×浸漬時間(單位：小時))」而求得的值為D₀ 。藉由使D₀ 為上述範圍，從而能夠抑制在清洗、高濕環境下的玻璃的表面品質的降低。D₀ 的下限沒有特別限定，能夠考慮將例如0.4×10^-3 mg/(cm² ・h)以上作為基準。(D ₀ ) In the above-mentioned optical glass 2, it is preferable that D _{0 is} less than 5.0×10 ^-3 mg / (cm ² ·h). D _{0 is} sometimes referred to as true chemical durability in water. The measuring method of D ₀ is as follows. First, a disk-shaped glass sample having a diameter of 43.7 mm and a thickness of 5 mm is prepared. Two opposing surfaces with a diameter of 43.7 mm are double-sided polished, and the side surfaces are masked by a method such as sticking a tape (for example, polyimide tape, etc.) that has chemical durability to pure water described below. Therefore, the two surfaces of the disk-shaped glass sample were exposed to pure water described below. The total area of these two surfaces (surface area of the glass sample) is 30 cm ² . Next, after measuring the mass M _before of the glass sample, the glass sample was immersed in a purely circulated flow rate of 1 liter per minute with an ion exchange resin, maintained at a water temperature of 50° C., pH=7.0±0.2, and sufficiently stirred. In water. The mass M _after of the glass sample after immersion in the pure water for 20 hours or more (preferably 40 hours or more) is measured. The value of the mass difference (M _before- M _after ) _{before and} _after immersion (unit: mg) divided by the surface area of the glass sample and the immersion time was set as D ₀ . That is, the value obtained by "(M _before- M _after )/(30 x immersion time (unit: hour))" is D ₀ . By setting D _{0 to} be in the above range, it is possible to suppress a decrease in the surface quality of the glass in a clean, high-humidity environment. The lower limit of D ₀ is not particularly limited, and for example, 0.4×10 ^-3 mg/(cm ² ·h) or more can be considered as a reference.

＜玻璃組成＞上述光學玻璃2較佳包含Nb⁵⁺ 。 Nb⁵⁺ 具有使部分分散比增加並且使化學耐久性提高的作用，尤其具有使D_NaOH 和D_A 的值降低的作用。從得到這樣的效果的方面出發，Nb⁵⁺ 的含量的較佳的範圍為1.0%以上，更佳的範圍為1.5%以上，進一步較佳的範圍為2%以上，更進一步較佳的範圍為2.5%以上，更進一步較佳的範圍為3%以上。此外，藉由含有Nb⁵⁺ ，能夠得到維持玻璃的熱穩定性的效果。從抑制玻璃熔融時的揮發性的方面出發，Nb⁵⁺ 的含量的較佳的上限為15%。<Glass composition> The optical glass 2 preferably contains Nb ⁵⁺ . Nb ⁵⁺ has the effect of increasing the partial dispersion ratio and improving the chemical durability, and particularly has the effect of reducing the values of D _NaOH and D _A. From the viewpoint of obtaining such an effect, the preferable range of the content of Nb ⁵⁺ is 1.0% or more, the more preferable range is 1.5% or more, the more preferable range is 2% or more, and the still more preferable range is 2.5% or more, and a further preferable range is 3% or more. In addition, by containing Nb ⁵⁺ , the effect of maintaining the thermal stability of the glass can be obtained. The preferable upper limit of the content of Nb ⁵⁺ is 15% from the viewpoint of suppressing volatility during glass melting.

由於Al³⁺ 和Nb⁵⁺ 均有助於提高化學耐久性，因此從對玻璃賦予優異的化學耐久性的方面出發，Al³⁺ 和Nb⁵⁺ 的合計含量較佳設為10%以上，更佳設為12%以上，進一步較佳設為15%以上。從維持熱穩定性的方面出發，Al³⁺ 和Nb⁵⁺ 的合計含量較佳設為45%以下，更佳設為35%以下。Since Al ³⁺ and Nb ⁵⁺ both contribute to the improvement of chemical durability, the total content of Al ³⁺ and Nb ⁵⁺ is preferably set to 10% or more from the viewpoint of imparting excellent chemical durability to the glass, more It is preferably 12% or more, and more preferably 15% or more. From the viewpoint of maintaining thermal stability, the total content of Al ³⁺ and Nb ⁵⁺ is preferably 45% or less, and more preferably 35% or less.

關於光學玻璃2的其它的玻璃組成，能夠將關於光學玻璃1所記載的上述各種事項的1個或2個以上任意組合而應用。此外，關於光學玻璃1的玻璃組成，能夠將關於光學玻璃2所記載的上述各種事項的1個或2個以上任意組合而應用。As for the other glass composition of the optical glass 2, any one or more of the above-mentioned various matters described for the optical glass 1 can be applied in any combination. In addition, the glass composition of the optical glass 1 can be applied by arbitrarily combining one or more of the above-mentioned various matters described for the optical glass 2.

＜玻璃的製造方法＞上述光學玻璃1和光學玻璃2能夠藉由例如以可得到期望的特性的方式將玻璃原料進行調合、熔融、成型而得到。作為玻璃原料，可以使用例如磷酸鹽、氟化物、鹼金屬化合物、鹼土金屬化合物等。關於玻璃的熔融法、成型法可以使用公知的方法。<The manufacturing method of glass> The said optical glass 1 and the optical glass 2 can be obtained by mixing, melting, and shaping a glass raw material so that a desired characteristic can be obtained, for example. As the glass raw material, for example, phosphates, fluorides, alkali metal compounds, alkaline earth metal compounds, and the like can be used. A well-known method can be used for the glass melting method and the molding method.

[壓製成型用玻璃材料及其製造方法以及玻璃成型體的製造方法] 根據本發明的一實施態樣，能夠提供由上述光學玻璃1或上述光學玻璃2形成的壓製成型用玻璃材料、由上述光學玻璃形成的玻璃成型體、以及它們的製造方法。壓製成型用玻璃材料是指加熱而供於壓製成型的玻璃塊的意思。作為壓製成型用玻璃材料的例子，能夠示出：精密壓製成型用預製件、用於壓製成型光學元件坯件的玻璃材料(壓製成型用玻璃料滴)等具有與壓製成型品的質量相當的質量的玻璃塊。壓製成型用玻璃材料可經過加工玻璃成型體的步驟而製作。玻璃成型體能夠像上述那樣對玻璃原料進行加熱、熔融，將得到的熔融玻璃成型而製作。作為玻璃成型體的加工法，能夠例示切割、研磨、拋光等。[Glass material for press molding, method for producing the same, and method for producing glass molded body] According to one embodiment of the present invention, the glass material for press molding formed from the optical glass 1 or the optical glass 2 described above can be provided. Glass molded bodies formed of glass, and methods for producing them. The glass material for press molding means the glass block heated and supplied for press molding. As examples of the glass material for press molding, a preform for precision press molding, a glass material for press molding of an optical element blank (glass drop for press molding), etc., have a quality equivalent to that of the press molded product Glass block. The glass material for press molding can be produced through the step of processing a glass molded body. The glass molded body can be produced by heating and melting glass raw materials as described above, and molding the obtained molten glass. As a processing method of the glass molded body, cutting, grinding, polishing, etc. can be exemplified.

[光學元件坯件及其製造方法] 根據本發明的一實施態樣，能夠提供由上述光學玻璃1或上述光學玻璃2形成的光學元件坯件。光學元件坯件為具有與想要製造的光學元件的形狀近似的形狀的玻璃成型體。光學元件坯件可以藉由將玻璃成型為在想要製造的光學元件的形狀上加上因加工而除去的加工餘量的形狀的方法等來製作。能夠藉由例如對壓製成型用玻璃材料進行加熱、軟化而壓製成型的方法(二次壓製法)；使用公知的方法將熔融玻璃塊供給至壓製成型模具而進行壓製成型的方法(直接壓製法)等而製作光學元件坯件。[Optical element blank and manufacturing method thereof] According to an embodiment of the present invention, an optical element blank formed of the optical glass 1 or the optical glass 2 described above can be provided. The optical element blank is a glass molded body having a shape similar to the shape of the optical element to be manufactured. The optical element blank can be produced by a method of molding glass into a shape in which the processing allowance removed by processing is added to the shape of the optical element to be manufactured. A method of compression molding (for example, secondary compression method) by heating and softening a glass material for compression molding (secondary compression method); a method of compression molding by supplying a molten glass block to a compression molding die using a known method (direct compression method) And so on to produce optical element blanks.

[光學元件及其製造方法] 根據本發明的一實施態樣，能夠提供由上述光學玻璃1或上述光學玻璃2形成的光學元件。作為光學元件的種類，能夠例示：球面透鏡、非球面透鏡等透鏡、棱鏡、繞射光柵等。作為透鏡的形狀，能夠例示：雙凸透鏡、平凸透鏡、雙凹透鏡、平凹透鏡、凸凹透鏡、凹凸透鏡等各種形狀。光學元件能夠藉由包含對由上述光學玻璃形成的玻璃成型體進行加工的步驟的方法來製造。作為加工，能夠例示：切割、切削、粗研磨、精研磨、拋光等。在進行這樣的加工時使用上述玻璃，從而能夠減輕破損，能夠穩定地供給高品質的光學元件。[Optical element and manufacturing method thereof] According to an embodiment of the present invention, an optical element formed of the optical glass 1 or the optical glass 2 can be provided. Examples of the types of optical elements include lenses such as spherical lenses and aspheric lenses, prisms, and diffraction gratings. As the shape of the lens, various shapes such as a lenticular lens, a plano-convex lens, a biconcave lens, a plano-concave lens, a convex-concave lens, and a concave-convex lens can be exemplified. The optical element can be manufactured by a method including the step of processing the glass molded body formed of the optical glass. Examples of processing include cutting, cutting, rough grinding, fine grinding, and polishing. When the above-mentioned glass is used for such processing, damage can be reduced, and high-quality optical elements can be stably supplied.

[實施例] 以下，藉由實施例對本發明進一步詳細說明。但是，本發明不限定於實施例所示的方式。[Examples] Hereinafter, the present invention will be described in further detail by examples. However, the present invention is not limited to the embodiments shown in the examples.

(實施例1) 以成為表1所示的玻璃組成的方式，使用與各玻璃組成分別相當的磷酸鹽、氟化物、氧化物等作為用於導入各成分的原料，稱量原料，充分混合而製成調合原料。將該調合原料加入到鉑製的坩堝中，進行加熱、熔融。熔融後，將熔融玻璃流入鑄模，放置冷卻至玻璃轉換溫度附近後立刻放入退火爐，在玻璃轉換溫度範圍進行約1小時退火處理後，在爐內放置冷卻至室溫，由此得到表1所示的各光學玻璃。使用光學顯微鏡放大觀察得到的光學玻璃，結果沒有發現晶體的析出、鉑粒子等異物、氣泡，也沒有觀察到條紋。像這樣得到的光學玻璃的各特性如表1所示。光學玻璃的各特性藉由以下所示的方法進行測定。(Example 1) Phosphates, fluorides, oxides, etc. corresponding to the respective glass compositions were used as raw materials for introducing the respective components so as to achieve the glass compositions shown in Table 1, and the raw materials were weighed and mixed thoroughly. Made into blended raw materials. This blended raw material was added to a platinum crucible, and heated and melted. After melting, the molten glass was poured into a mold, placed and cooled to near the glass transition temperature, and immediately placed in an annealing furnace. After annealing for about 1 hour in the glass transition temperature range, it was placed in the furnace and cooled to room temperature, thereby obtaining Table 1. Each optical glass shown. When the optical glass obtained was magnified and observed with an optical microscope, no precipitation of crystals, foreign particles such as platinum particles, bubbles, and streaks were observed. Each characteristic of the optical glass obtained in this way is shown in Table 1. Each characteristic of optical glass was measured by the method shown below.

(1)折射率nd、ng、nF、nC及阿貝數νd 使用日本光學玻璃工業協會標準的折射率測定法，對以降溫速度-30℃/小時進行降溫而得到的玻璃，測定折射率nd、ng、nF、nC、阿貝數νd。此外，在圖1中，對上述各光學玻璃的阿貝數νd和折射率nd進行製圖。(1) Refractive index nd, ng, nF, nC and Abbe number νd The refractive index nd is measured for the glass obtained by cooling at a cooling rate of -30°C/hour using the standard refractive index measurement method of the Japan Optical Glass Industry Association , Ng, nF, nC, Abbe number νd. In addition, in FIG. 1, the Abbe number νd and the refractive index nd of each optical glass described above are plotted.

(2)部分分散比Pg,F以及Pg,F從標準線偏離的偏差ΔPg,F 根據折射率ng、nF、nC算出部分分散比Pg,F，並且算出從根據阿貝數νd算出的標準線上的部分分散比Pg,F(0)偏離的偏差ΔPg,F。在表1中，示出折射率nd、阿貝數νd以及由ng、nF、nC算出的Pg,F和ΔPg,F。此外，在圖2中，對上述各光學玻璃的阿貝數νd和部分分散比Pg,F進行製圖。(2) Partial dispersion ratio Pg, F and Pg, F deviation from the standard line ΔPg, F Partial dispersion ratio Pg, F is calculated from the refractive index ng, nF, nC, and from the standard line calculated from Abbe number νd The partial dispersion ratio Pg,F(0) deviates from the deviation ΔPg,F. In Table 1, the refractive index nd, Abbe number νd, and Pg,F and ΔPg,F calculated from ng, nF, and nC are shown. In addition, in FIG. 2, the Abbe number νd and the partial dispersion ratio Pg,F of each optical glass described above are plotted.

(3)玻璃轉換溫度Tg 使用NETZSCH公司製造的差示掃描量熱分析裝置(DSC3300)，以升溫速度10℃/分鐘測定玻璃轉換溫度Tg。(3) Glass transition temperature Tg Using a differential scanning calorimetry analyzer (DSC3300) manufactured by NETZSCH, the glass transition temperature Tg was measured at a temperature increase rate of 10°C/min.

(4)液相溫度LT 將50g的玻璃放入鉑坩堝內，以蓋上鉑蓋的狀態在1100℃融解20分鐘後，在規定的溫度保持2小時。觀察保持2小時後的玻璃，根據有無晶體的析出而求得液相溫度LT。對於表1所示的各玻璃，使用上述的方法將玻璃在850℃保持2小時後，進行目視和使用光學顯微鏡的放大觀察(100倍)，結果沒有發現晶體的析出。因此，表1所示的各玻璃的液相溫度LT為850℃以下。(4) Liquid phase temperature LT 50 g of glass was placed in a platinum crucible, melted at 1100° C. for 20 minutes in a state covered with a platinum lid, and then maintained at a predetermined temperature for 2 hours. The glass after holding for 2 hours was observed, and the liquidus temperature LT was determined based on the presence or absence of crystal precipitation. For each glass shown in Table 1, after holding the glass at 850°C for 2 hours using the method described above, visual observation and magnification observation (100 times) using an optical microscope were performed, and as a result, no precipitation of crystals was found. Therefore, the liquidus temperature LT of each glass shown in Table 1 is 850°C or less.

(5)比重藉由阿基米德法測定比重。(5) Specific gravity Determine specific gravity by Archimedes method.

(6)融解中的揮發減少量的評價使玻璃批料(以收量計為150～200g)填充到鉑坩堝，蓋上鉑蓋，測定質量X，然後在1050℃融解1.5小時。然後，在即將把熔融玻璃澆鑄到鑄模前再次測定內部加入了熔融玻璃的蓋有鉑蓋的鉑坩堝的質量Y，求得質量變化率(X-Y)/X。當以收量成為150g的方式準備玻璃批料時，X為150g，當以收量為200g的方式準備玻璃批料時，X為200g。在玻璃批料包含碳酸鹽的情況下，在融解中，碳酸鹽中的CO₂ 被排出。在玻璃批料包含硫酸鹽、硝酸鹽、氫氧化物的情況下，SO₃ 、NO₂ 、H₂ O在融解中被排出。可以預先算出玻璃批料中包含的CO₂ 、SO₃ 、NO₂ 、H₂ O這些氣體成分的質量，以從玻璃批料的質量中減去氣體成分的質量的值成為質量X的方式來製備玻璃批料。在表1中，質量變化率為2%以下的設為A，質量變化率大於2%且為4%以下的設為B，質量變化率大於4%的設為C。另外，對表1所示的實施例的各玻璃，按照日本光學玻璃工業協會標準的內部透射率測定(JOGIS-17)測定在厚度10mm的內部透射率，結果在所有的試樣中均具有96.50%以上的透射率。(6) Evaluation of reduction in volatilization during melting A platinum crucible was filled with a glass batch (150-200 g in terms of yield), covered with a platinum lid, and mass X was measured, followed by melting at 1050°C for 1.5 hours. Then, immediately before casting the molten glass into the casting mold, the mass Y of the platinum crucible covered with a platinum lid and containing molten glass was measured again, and the mass change rate (XY)/X was obtained. When a glass batch is prepared in a yield of 150 g, X is 150 g, and when a glass batch is prepared in a yield of 200 g, X is 200 g. In the case where the glass batch contains carbonate, the CO ₂ in the carbonate is discharged during melting. In the case where the glass batch contains sulfate, nitrate, and hydroxide, SO ₃ , NO ₂ , and H ₂ O are discharged during melting. The mass of the gas components CO ₂ , SO ₃ , NO ₂ , and H ₂ O contained in the glass batch can be calculated in advance, and prepared by subtracting the mass of the gas component from the mass of the glass batch to become the mass X Glass batch. In Table 1, the rate of change of mass is 2% or less is set to A, the rate of change of mass is greater than 2% and 4% or less is set to B, and the rate of change of mass is greater than 4% is set to C. In addition, for each glass of the example shown in Table 1, the internal transmittance was measured at a thickness of 10 mm according to the internal transmittance measurement (JOGIS-17) standard of the Japan Optical Glass Industry Association. As a result, all the samples had 96.50 % Transmittance.

(7)D_NaOH 將直徑43.7mm、厚5mm的圓板狀的玻璃試樣(2個表面被雙面拋光)浸漬在液體溫度50℃、濃度0.01 mol/l的充分攪拌的氫氧化鈉(NaOH)的水溶液中15小時，將浸漬前後的質量減少量除以玻璃試樣的表面積的值作為D_NaOH 。(7) D _NaOH Dip a 43.7mm diameter and 5mm thick disc-shaped glass sample (two surfaces are polished on both sides) into a fully stirred sodium hydroxide (NaOH) with a liquid temperature of 50°C and a concentration of 0.01 mol/l ) In the aqueous solution for 15 hours, the value of the mass reduction before and after immersion divided by the surface area of the glass sample is taken as D _NaOH .

(8)D_A 將與比重相當的質量(g)的粉末玻璃(粒度425μm～600μm)放入鉑筐中，將其浸漬在石英玻璃製圓底燒瓶內的80ml的濃度0.01 mol/l的硝酸水溶液中，在沸騰水溶中處理60分鐘，將處理前後的粉末玻璃的質量減少量除以浸漬前的粉末玻璃的質量的值的百分比設為D_A 。(8) D _A considerable proportion of the mass (g) of glass powder (particle size 425μm ~ 600μm) put into a platinum basket, immersed 80ml its concentration in the quartz glass-made round bottom flask 0.01 mol / l nitric acid In the aqueous solution, the treatment was carried out in boiling water solution for 60 minutes, and the percentage of the value obtained by dividing the mass reduction of the powder glass before and after the treatment by the mass of the powder glass before immersion was D _A.

(9)D_STPP 將直徑43.7mm、厚5mm的圓板狀的玻璃試樣浸漬在液體溫度50℃、濃度0.01 mol/l的充分攪拌的三聚磷酸鈉(Na₅ P₃ O₁₀ )的水溶液中1小時，將浸漬前後的質量減少量除以玻璃試樣的表面積和浸漬時間的值作為D_STPP 。(9) D _STPP immersed a disc-shaped glass sample with a diameter of 43.7 mm and a thickness of 5 mm in a well-stirred aqueous solution of sodium tripolyphosphate (Na ₅ P ₃ O ₁₀ ) at a liquid temperature of 50°C and a concentration of 0.01 mol/l During 1 hour, the value of the mass reduction before and after the immersion is divided by the surface area of the glass sample and the immersion time as D _STPP .

(10)D₀ 將直徑43.7mm、厚5mm的圓板狀的玻璃試樣浸漬在以每分鐘1升的速度藉由離子交換樹脂進行循環、保持在水溫50℃、pH＝7.0±0.2、充分攪拌的純水中45小時，將浸漬前後的質量差除以玻璃試樣的單位表面積和浸漬的時間的值作為D₀ 。(10) D ₀ immersed a disk-shaped glass sample with a diameter of 43.7 mm and a thickness of 5 mm in a circulation of 1 liter per minute through an ion exchange resin, maintained at a water temperature of 50° C., and pH=7.0±0.2, For 45 hours of fully stirred pure water, the difference in mass before and after the immersion was divided by the value of the unit surface area of the glass sample and the immersion time as D ₀ .

(比較例1) 製作具有表1所示的比較例1的組成的玻璃，按照上述方法，對折射率nd、阿貝數νd、部分分散比Pg,F、玻璃轉換溫度Tg、比重、融解中的揮發減少量進行評價。比較例1為關於光學玻璃1的比較例的玻璃，進行融解中的揮發減少量的評價，結果質量變化率大於4%(評價結果C)。(Comparative Example 1) A glass having the composition of Comparative Example 1 shown in Table 1 was prepared. According to the above method, the refractive index nd, Abbe number νd, partial dispersion ratio Pg, F, glass transition temperature Tg, specific gravity, melting The amount of volatile reduction was evaluated. Comparative Example 1 is a glass of the comparative example of the optical glass 1, and the amount of volatilization reduction during melting was evaluated, and as a result, the mass change rate was greater than 4% (evaluation result C).

(比較例2) 製作具有表1所示的比較例2的組成的玻璃，對折射率nd、阿貝數νd、部分分散比Pg,F、玻璃轉換溫度Tg、比重、融解中的揮發減少量、D_NaOH 進行評價。評價結果如表1所示。比較例2為關於光學玻璃2的比較例的玻璃，D_NaOH 大於0.25mg/(cm² ・15h)，且不滿足(4)式。(Comparative Example 2) A glass having the composition of Comparative Example 2 shown in Table 1 was prepared. The refractive index nd, Abbe number νd, partial dispersion ratio Pg, F, glass transition temperature Tg, specific gravity, and volatile reduction during melting , D _NaOH for evaluation. The evaluation results are shown in Table 1. Comparative example 2 is a glass of a comparative example of optical glass 2, D _{NaOH is} more than 0.25 mg/(cm ² ·15h), and does not satisfy the formula (4).

以上的結果如表1(表1-1～表1-7)所示。The above results are shown in Table 1 (Table 1-1 to Table 1-7).

(註)在正值的情況下，滿足下式。 Pg,F＞-0.0004νd+0.5718

(Note) In the case of a positive value, the following formula is satisfied. Pg,F＞-0.0004νd+0.5718

(註)在正值的情況下，滿足下式。 Pg,F＞-0.0004νd+0.5718

(註)在正值的情況下，滿足下式。 Pg,F＞-0.0004νd+0.5718

(註)在正值的情況下，滿足下式。 Pg,F＞-0.0004νd+0.5718

(註)在正值的情況下，滿足下式。 Pg,F＞-0.0004νd+0.5718

(註)在正值的情況下，滿足下式。 Pg,F＞-0.0004νd+0.5718

(註)在正值的情況下，滿足下式。 Pg,F＞-0.0004νd+0.5718

表1中的實施例的以原子%表示的玻璃組成如表2(表2-1～表2-3)所示。The glass composition in atomic% of the examples in Table 1 is shown in Table 2 (Table 2-1 to Table 2-3).

(實施例2) 使用上述實施例1的各光學玻璃，按照上述的公知的方法製作透鏡坯件。對製作的透鏡坯件進行研磨、拋光，製作各種透鏡(雙凸透鏡、凸凹鏡、凹凸透鏡、雙凹透鏡、平凸透鏡、平凹透鏡)。任一透鏡均為輕質、適合於高階的色像差校正的透鏡。(Example 2) Using each optical glass of Example 1 above, a lens blank was produced in accordance with the above-mentioned known method. Grind and polish the produced lens blanks to produce various lenses (biconvex lens, convex-concave mirror, concave-convex lens, biconcave lens, plano-convex lens, plano-concave lens). Either lens is lightweight and suitable for high-order chromatic aberration correction.

最後，對上述的各方式進行總結。Finally, the above methods are summarized.

根據一實施態樣，可提供光學玻璃1，該光學玻璃1包含P⁵⁺ 、Al³⁺ 、Nb⁵⁺ 、O^2- 及F^- 作為必要成分，Al³⁺ 的含量相對於P⁵⁺ 的含量的莫耳比(Al³⁺ /P⁵⁺ )為0.30以上，Nb⁵⁺ 的含量為1.0陽離子%以上，O^2- 的含量為10～85陰離子%、F^- 的含量為15～90陰離子%、O^2- 的含量相對於P⁵⁺ 和Nb⁵⁺ 的合計含量的莫耳比(O^2- /(P⁵⁺ +Nb⁵⁺ ))為3.0以上。According to an embodiment, an optical glass 1 can be provided, which includes P ⁵⁺ , Al ³⁺ , Nb ⁵⁺ , O ^2- and F ^- as essential components, and the content of Al ³⁺ relative to that of P ⁵⁺ The molar ratio of the content (Al ³⁺ /P ⁵⁺ ) is 0.30 or more, the content of Nb ⁵⁺ is 1.0 cation% or more, the content of O ^2- is 10 to 85 anions %, and the content of F ^- is 15 to 90 anions The molar ratio of the content of% and O ^2- to the total content of P ⁵⁺ and Nb ⁵⁺ (O ^2- /(P ⁵⁺ +Nb ⁵⁺ )) is 3.0 or more.

在一實施態樣中，上述光學玻璃1能夠包含至少一種選自Mg²⁺ 、Ca²⁺ 、Sr²⁺ 及Ba²⁺ 中的鹼土金屬成分，Mg²⁺ 、Ca²⁺ 、Sr²⁺ 及Ba²⁺ 的合計含量為20陽離子%以上。In one embodiment, the optical glass 1 can include at least one alkaline earth metal component selected from the group consisting of Mg ²⁺ , Ca ²⁺ , Sr ²⁺ and Ba ²⁺ , Mg ²⁺ , Ca ²⁺ , Sr ²⁺ and The total content of Ba ²⁺ is 20 cation% or more.

在一實施態樣中，上述光學玻璃1的P⁵⁺ 的含量能夠為5～40陽離子%，Al³⁺ 的含量能夠為5～30陽離子%。In one embodiment, the content of P ⁵⁺ in the optical glass 1 can be ^5-40 cation %, and the content of Al ³⁺ can be 5-30 cation %.

在一實施態樣中，上述光學玻璃1的莫耳比(O^2- /(P⁵⁺ +Nb⁵⁺ ))能夠為4.0以下。In one embodiment, the molar ratio (O ^2- /(P ⁵⁺ +Nb ⁵⁺ )) of the optical glass 1 can be 4.0 or less.

在一實施態樣中，上述光學玻璃1能夠包含至少一種選自La³⁺ 、Gd³⁺ 、Y³⁺ 、Lu³⁺ 及Yb³⁺ 中的稀土成分，La³⁺ 、Gd³⁺ 、Y³⁺ 、Lu³⁺ 及Yb³⁺ 的合計含量(La³⁺ +Gd³⁺ +Y³⁺ +Lu³⁺ +Yb³⁺ )相對於Al³⁺ 的含量的莫耳比((La³⁺ +Gd³⁺ +Y³⁺ +Lu³⁺ +Yb³⁺ )/Al³⁺ )能夠為0.3以下。In an embodiment, the optical glass 1 can include at least one rare earth component selected from La ³⁺ , Gd ³⁺ , Y ³⁺ , Lu ³⁺ and Yb ³⁺ , La ³⁺ , Gd ³⁺ , Y The total content of ³⁺ , Lu ³⁺ and Yb ³⁺ (La ³⁺ +Gd ³⁺ +Y ³⁺ +Lu ³⁺ +Yb ³⁺ ) relative to the content of Al ³⁺ ((La ³⁺ +Gd ³⁺ +Y ³⁺ +Lu ³⁺ +Yb ³⁺ )/Al ³⁺ ) can be 0.3 or less.

根據一實施態樣，可提供光學玻璃2，該光學玻璃2由氟磷酸鹽玻璃形成，浸漬於NaOH水溶液中15小時情況下的每單位面積的質量減少量D_NaOH 小於0.25mg/(cm²‧15h)，且阿貝數νd和部分分散比Pg,F滿足上述(4)式。 According to an embodiment, an optical glass 2 can be provided, which is formed of fluorophosphate glass and has a mass reduction per unit area D _{NaOH of} less than 0.25 mg/(cm ² ‧ when immersed in an aqueous NaOH solution for 15 hours 15h), and Abbe number νd and partial dispersion ratio Pg, F satisfy the above formula (4).

根據一實施態樣，上述光學玻璃2的D_A能夠小於0.35%。 According to an embodiment, the D _{A of} the optical glass 2 can be less than 0.35%.

根據一實施態樣，上述光學玻璃2的D_STPP能夠小於0.40mg/(cm²‧h)。 According to an embodiment, the D _{STPP of} the optical glass 2 can be less than 0.40 mg/(cm ² ‧h).

根據一實施態樣，上述光學玻璃2的D₀能夠小於5.0×10^-3mg/(cm²‧h)。 According to an embodiment, the D _{0 of the} above optical glass 2 can be less than 5.0×10 ^-3 mg/(cm ² ‧h).

根據一實施態樣，上述光學玻璃2能夠包含Nb⁵⁺。 According to one embodiment, the optical glass 2 can contain Nb ⁵⁺ .

根據一實施態樣，上述光學玻璃2能夠包含1.0%以上的Nb⁵⁺。 According to an embodiment, the optical glass 2 can contain Nb ^{5+ of} 1.0% or more.

根據一實施態樣，上述光學玻璃2的Nb⁵⁺的含量能夠為15%以下。 According to one embodiment, the Nb ⁵⁺ content of the optical glass 2 can be 15% or less.

根據一實施態樣，上述光學玻璃2的Al³⁺和Nb⁵⁺的合計含量能夠為10%以上。 According to one embodiment, the total content of Al ³⁺ and Nb ⁵⁺ of the optical glass 2 can be 10% or more.

根據一實施態樣，上述光學玻璃2的P⁵⁺的含量能夠為5~40%。 According to an embodiment, the content of P ⁵⁺ in the optical glass 2 can be ^5-40 %.

根據一實施態樣，上述光學玻璃2的Al³⁺的含量能夠為5~40%。 According to an embodiment, the Al ³⁺ content of the optical glass 2 can be 5-40%.

根據一實施態樣，上述光學玻璃2的Mg²⁺的含量能夠為0~10%。 According to one embodiment, the Mg ²⁺ content of the optical glass 2 can be 0-10%.

根據一實施態樣，上述光學玻璃2的Ca²⁺的含量能夠為0~20%。 According to an embodiment, the Ca ²⁺ content of the optical glass 2 can be 0-20%.

根據一實施態樣，上述光學玻璃2的Sr²⁺的含量能夠為0~40%。 According to an embodiment, the Sr ²⁺ content of the optical glass 2 can be 0-40%.

根據一實施態樣，上述光學玻璃2的Ba²⁺的含量能夠為5~40%。 According to one embodiment, the Ba ²⁺ content of the optical glass 2 can be 5-40%.

根據一實施態樣，上述光學玻璃2的La³⁺的含量能夠為0~5%。 According to an embodiment, the content of La ³⁺ in the optical glass 2 can be 0 to 5%.

根據一實施態樣，上述光學玻璃2的Gd³⁺的含量能夠為0~5%。 According to an embodiment, the content of Gd ³⁺ in the optical glass 2 can be 0 to 5%.

根據一實施態樣，上述光學玻璃2的Y³⁺的含量能夠為0~5%。 According to an embodiment, the content of Y ³⁺ in the optical glass 2 can be 0 to 5%.

根據一實施態樣，上述光學玻璃2的Lu³⁺的含量能夠為0~5%。 According to one embodiment, the content of Lu ³⁺ in the optical glass 2 can be 0 to 5%.

根據一實施態樣，上述光學玻璃2的Yb³⁺的含量相對於La³⁺、Gd³⁺、Y³⁺、Lu³⁺及Yb³⁺的合計含量的莫耳比(Yb³⁺/(La³⁺+Gd³⁺+Y³⁺+Lu³⁺+Yb³⁺))能夠為0.5以下。According to one embodiment, the content of Yb ³⁺ in the optical glass 2 is a molar ratio of the total content of La ³⁺ , Gd ³⁺ , Y ³⁺ , Lu ³⁺ and Yb ³⁺ (Yb ³⁺ /( La ³⁺ +Gd ³⁺ +Y ³⁺ +Lu ³⁺ +Yb ³⁺ )) can be 0.5 or less.

根據一實施態樣，上述光學玻璃2的Zn²⁺ 的含量能夠為0～10%。According to an embodiment, the content of Zn ²⁺ of the optical glass 2 can be 0 to 10%.

根據一實施態樣，上述光學玻璃2的鹼金屬成分的合計含量能夠為0～30%。According to one embodiment, the total content of the alkali metal components of the optical glass 2 can be 0 to 30%.

根據一實施態樣，上述光學玻璃2的Rb⁺ 的含量能夠為0～1%。According to an embodiment, the Rb ⁺ content of the optical glass 2 can be 0 to 1%.

根據一實施態樣，上述光學玻璃2的Cs⁺ 的含量能夠為0～1%。According to one embodiment, the Cs ⁺ content of the optical glass 2 can be 0 to 1%.

根據一實施態樣，上述光學玻璃2的Li⁺ 的含量能夠為0～30%。According to an embodiment, the content of Li ⁺ of the optical glass 2 can be 0 to 30%.

根據一實施態樣，上述光學玻璃2的Li⁺ 的含量能夠為2%以上。According to one embodiment, the content of Li ⁺ in the optical glass 2 can be 2% or more.

根據一實施態樣，上述光學玻璃2的Li⁺ 的含量能夠為4～10%。According to one embodiment, the content of Li ⁺ of the optical glass 2 can be 4 to 10%.

根據一實施態樣，上述光學玻璃2的Na⁺ 的含量能夠為0～10%。According to one embodiment, the Na ⁺ content of the optical glass 2 can be 0 to 10%.

根據一實施態樣，上述光學玻璃2的K⁺ 的含量能夠為0～10%。According to an embodiment, the K ⁺ content of the optical glass 2 can be 0 to 10%.

根據一實施態樣，上述光學玻璃2的Si⁴⁺ 的含量能夠為0～5%。According to an embodiment, the Si ⁴⁺ content of the optical glass 2 can be 0 to 5%.

根據一實施態樣，上述光學玻璃2的B³⁺ 的含量能夠為2%以下。According to one embodiment, the content of B ³⁺ in the optical glass 2 can be 2% or less.

根據一實施態樣，上述光學玻璃2的Cl^- 的含量能夠為0～1%。According to one embodiment, the Cl ^- content of the optical glass 2 can be 0 to 1%.

根據一實施態樣，上述光學玻璃2的Sb³⁺ 和Ce⁴⁺ 的合計含量能夠為0%以上，能夠小於1%。According to one embodiment, the total content of Sb ³⁺ and Ce ⁴⁺ in the optical glass 2 can be 0% or more and can be less than 1%.

根據一實施態樣，上述光學玻璃2能夠實質上不包含Pb、Cd、As及Th中的至少一種。According to an embodiment, the optical glass 2 may not substantially include at least one of Pb, Cd, As, and Th.

根據一實施態樣，上述光學玻璃2能夠實質上不包含Cu、Co、Ni、Fe、Cr、Eu、Nd、Er及V中的至少一種。According to an embodiment, the optical glass 2 may not substantially include at least one of Cu, Co, Ni, Fe, Cr, Eu, Nd, Er, and V.

根據一實施態樣，上述光學玻璃2能夠實質上不包含Hf、Ga、Ge、Te及Tb中的至少一種。According to an embodiment, the optical glass 2 may not substantially include at least one of Hf, Ga, Ge, Te, and Tb.

根據一實施態樣，上述光學玻璃2的阿貝數νd能夠為45以上。According to an embodiment, the Abbe number νd of the optical glass 2 can be 45 or more.

根據一實施態樣，上述光學玻璃2的阿貝數νd能夠為80以下。According to an embodiment, the Abbe number νd of the optical glass 2 can be 80 or less.

根據一實施態樣，上述光學玻璃2的折射率nd和阿貝數νd能夠滿足下述(2)式。 nd≥1.80653-0.00459×νd ・・・(2)式According to one embodiment, the refractive index nd and Abbe number νd of the optical glass 2 can satisfy the following formula (2). nd≥1.80653-0.00459×νd・(2)

根據一實施態樣，上述光學玻璃2的折射率nd和阿貝數νd能夠滿足下述(3)式。 nd≥1.84303-0.00459×νd ・・・(3)式According to one embodiment, the refractive index nd and Abbe number νd of the optical glass 2 can satisfy the following formula (3). nd≥1.84303-0.00459×νd・(3)

根據一實施態樣，上述光學玻璃2的波長400nm～700nm、厚度10mm時的內部透射率能夠為96.5%以上。According to one embodiment, the internal transmittance of the optical glass 2 at a wavelength of 400 nm to 700 nm and a thickness of 10 mm can be 96.5% or more.

根據一實施態樣，上述光學玻璃2的玻璃轉換溫度Tg能夠為550℃以下。According to one embodiment, the glass transition temperature Tg of the optical glass 2 can be 550° C. or lower.

根據一實施態樣，上述光學玻璃2的液相溫度能夠為850℃以下。According to an embodiment, the liquidus temperature of the optical glass 2 can be 850°C or lower.

根據一實施態樣，上述光學玻璃2的比重能夠為4.2以下。According to an embodiment, the specific gravity of the optical glass 2 can be 4.2 or less.

進而根據另一實施態樣，可提供由上述光學玻璃1或上述光學玻璃2形成的光學元件。According to another embodiment, an optical element formed of the optical glass 1 or the optical glass 2 can be provided.

應當認為本次公開的實施方式在所有方面均為例示而並非限制。本發明的範圍是由專利請求保護的範圍而不是上述的說明所示出的，意在包含與專利請求保護的範圍等同的含義和範圍內的全部變更。例如，對於上述例示的玻璃組成，能夠藉由進行說明書中記載的組成調整而得到本發明的一實施態樣的光學玻璃。此外，當然能夠將2個以上的說明書中作為例示或較佳的範圍而記載的事項進行任意組合。It should be considered that the embodiment disclosed this time is an example in all respects and not a limitation. The scope of the present invention is shown by the scope claimed by the patent rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope claimed by the patent. For example, regarding the glass composition exemplified above, the optical glass according to an embodiment of the present invention can be obtained by adjusting the composition described in the specification. In addition, it is of course possible to arbitrarily combine items described as examples or preferable ranges in two or more specifications.

無。no.

圖1表示於阿貝數νd-折射率nd圖中，實施例之光學玻璃的光學特性。圖2表示於阿貝數νd-部分分散比Pg,F圖中，實施例的光學玻璃的光學特性和現有的光學玻璃的光學特性。FIG. 1 shows the optical characteristics of the optical glass of the embodiment in the Abbe number νd-refractive index nd graph. FIG. 2 shows the optical characteristics of the optical glass of the example and the optical characteristics of the conventional optical glass in the Abbe number νd-partial dispersion ratio Pg, F graph.

Claims

一種光學玻璃，包含P⁵⁺、Al³⁺、Nb⁵⁺、O^2-及F^-作為必要成分；Al³⁺的含量相對於P⁵⁺的含量的莫耳比(Al³⁺/P⁵⁺)為0.30以上；Nb⁵⁺的含量為1.0陽離子%以上；O^2-的含量為10~85陰離子%；F^-的含量為15~90陰離子%；O^2-的含量相對於P⁵⁺和Nb⁵⁺的合計含量的莫耳比(O^2-/(P⁵⁺+Nb⁵⁺))為3.0以上。 An optical glass containing P ⁵⁺ , Al ³⁺ , Nb ⁵⁺ , O ^2- and F ^- as essential components; the molar ratio of the content of Al ^{3+ to} the content of P ⁵⁺ (Al ³⁺ /P ^{5 +} ) Is 0.30 or more; Nb ⁵⁺ content is 1.0 cation% or more; O ^2- content is 10~85 anion %; F ^- content is 15~90 anion %; O ^2- content is relative to P ⁵⁺ and the total content of Nb ⁵⁺ molar ratio ^{^{(O 2- / (P 5+ +}} Nb 5+)) is 3.0 or more.

如申請專利範圍第1項所述之光學玻璃，其中，包含至少一種選自Mg²⁺、Ca²⁺、Sr²⁺及Ba²⁺中的鹼土金屬成分；Mg²⁺、Ca²⁺、Sr²⁺及Ba²⁺的合計含量為20陽離子%以上。 The optical glass as described in item 1 of the patent application scope, which contains at least one alkaline earth metal component selected from Mg ²⁺ , Ca ²⁺ , Sr ²⁺ and Ba ²⁺ ; Mg ²⁺ , Ca ²⁺ , Sr The total content of ²⁺ and Ba ²⁺ is 20 cation% or more.

如申請專利範圍第1項所述之光學玻璃，其中，P⁵⁺的含量為5~40陽離子%；Al³⁺的含量為5~30陽離子%。 The optical glass as described in item 1 of the patent application scope, wherein the content of P ^{5+ is 5-40} cation %; the content of Al ³⁺ is 5-30 cation %.

如申請專利範圍第1至3項中任一項所述之光學玻璃，其中，莫耳比(O^2-/(P⁵⁺+Nb⁵⁺))為4.0以下。 The optical glass according to any one of items 1 to 3 of the patent application range, wherein the molar ratio (O ^2- /(P ⁵⁺ +Nb ⁵⁺ )) is 4.0 or less.

如申請專利範圍第1至3項中任一項所述之光學玻璃，其中，包含至少一種選自La³⁺、Gd³⁺、Y³⁺、Lu³⁺及Yb³⁺中的稀土成分；La³⁺、Gd³⁺、Y³⁺、Lu³⁺及Yb³⁺的合計含量(La³⁺+Gd³⁺+Y³⁺+Lu³⁺+Yb³⁺)相對於Al³⁺的含量的莫耳比((La³⁺+Gd³⁺+Y³⁺+Lu³⁺+Yb³⁺)/Al³⁺)為0.3以下。 The optical glass according to any one of items 1 to 3 of the patent application scope, which contains at least one rare earth component selected from La ³⁺ , Gd ³⁺ , Y ³⁺ , Lu ³⁺ and Yb ³⁺ ; The total content of La ³⁺ , Gd ³⁺ , Y ³⁺ , Lu ³⁺ and Yb ³⁺ (La ³⁺ +Gd ³⁺ +Y ³⁺ +Lu ³⁺ +Yb ³⁺ ) relative to Al ³⁺ The molar ratio ((La ³⁺ +Gd ³⁺ +Y ³⁺ +Lu ³⁺ +Yb ³⁺ )/Al ³⁺ ) is 0.3 or less.

一種光學玻璃，由氟磷酸鹽玻璃形成，其中包含Nb⁵⁺作為必要成分且O^2-的含量相對於P⁵⁺和Nb⁵⁺的合計含量的莫耳比(O^2-/(P⁵⁺+Nb⁵⁺))為3.0以上，浸漬於NaOH水溶液中15小時情況下的每單位面積的質量減少量D_NaOH小於0.25mg/(cm²‧15h)；且阿貝數νd和部分分散比Pg,F滿足下述(4)式： Pg,F>-0.0004νd+0.5718 (4)式。 An optical glass formed of fluorophosphate glass, which contains Nb ⁵⁺ as an essential component and the molar ratio of the content of O ^2- relative to the total content of P ⁵⁺ and Nb ⁵⁺ (O ^2- /(P ⁵⁺ +Nb ⁵⁺ )) is 3.0 or more, the mass reduction per unit area D _{NaOH is} less than 0.25 mg/(cm ² ‧15h) when immersed in NaOH aqueous solution for 15 hours; and Abbe number νd and partial dispersion ratio Pg , F satisfies the following formula (4): Pg, F>-0.0004νd+0.5718 (4) formula.

一種光學元件，係由申請專利範圍第1至6項中任一項所述之光學玻璃形成。An optical element is formed from the optical glass described in any one of the items 1 to 6 of the patent application range.