JP4641863B2 - Optical glass and optical product manufacturing method - Google Patents
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- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
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Description
本発明は光学ガラスに関し、さらに詳しくは、高屈折率で低分散の光学特性を有すると共に、安定生産が可能な光学ガラスに関するものである。 The present invention relates to an optical glass, and more particularly to an optical glass having high refractive index and low dispersion optical characteristics and capable of stable production.
従来、高屈折率で、かつ低分散の光学特性を有する光学ガラスは、例えば特許文献１や特許文献２に示されているように、高屈折率、低分散特性をもたらすために、Ｌａ２Ｏ３、Ｇｄ２Ｏ３、Ｙ２Ｏ３、Ｔａ２Ｏ５、ＺｒＯ２などが多量に含有され、Ｂ２Ｏ３やＳｉＯ２などのガラス網目形成成分が少ないために、極めて結晶化傾向が強いものになっており、安定生産に問題があった。
本発明は、このような事情のもとで、高屈折率で低分散の光学特性を有すると共に、安定生産が可能な光学ガラス、およびそれを用いた光学製品の製造方法を提供することを目的とするものである。 SUMMARY OF THE INVENTION An object of the present invention is to provide an optical glass having high refractive index and low dispersion optical characteristics and capable of stable production under such circumstances, and an optical product manufacturing method using the same. It is what.
本発明者らは、前記の好ましい特性を有する光学ガラスを開発すべく、ガラスを構成する各成分組成の光学的特性、熱的特性および耐失透性などに与える影響について鋭意研究を重ねた結果、ＳｉＯ２とＢ２Ｏ３との合計含有量に対し、Ｌａ２Ｏ３とＧｄ２Ｏ３とＹ２Ｏ３とＹｂ２Ｏ３との合計含有量の割合およびＺｒＯ２とＴａ２Ｏ５とＮｂ２Ｏ５との合計含有量の割合を特定範囲に制御することにより、高屈折率で低分散の光学特性を有し、しかも安定生産が可能な光学ガラスが得られること、そして、この光学ガラスを用い、特定の工程を施すことにより、所望の光学製品が効率よく得られることを見出し、この知見に基づいて本発明を完成するに至った。 In order to develop an optical glass having the above-mentioned preferable characteristics, the present inventors have conducted extensive research on the influence of each component composition constituting the glass on the optical characteristics, thermal characteristics, devitrification resistance, etc. The ratio of the total content of La 2 O 3 , Gd 2 O 3 , Y 2 O 3 and Yb 2 O 3 to the total content of SiO 2 and B 2 O 3 , and ZrO 2 and Ta 2 O 5 By controlling the ratio of the total content of Nb 2 O 5 to a specific range, an optical glass having high refractive index and low dispersion optical characteristics and capable of stable production can be obtained. It has been found that a desired optical product can be efficiently obtained by applying a specific process using optical glass, and the present invention has been completed based on this finding.
すなわち、本発明は、
（１） Ｌａ２Ｏ３、Ｇｄ２Ｏ３、Ｙ２Ｏ３およびＹｂ２Ｏ３の中から選ばれる少なくとも１種と、ＺｒＯ２、Ｔａ２Ｏ５およびＮｂ２Ｏ５の中から選ばれる少なくとも１種を含むホウケイ酸ガラスであって、ＳｉＯ２とＢ２Ｏ３との合計含有量に対し、Ｌａ２Ｏ３とＧｄ２Ｏ３とＹ２Ｏ３とＹｂ２Ｏ３との合計含有量の割合（重量比）が２〜４であり、かつＺｒＯ２とＴａ２Ｏ５とＮｂ２Ｏ５との合計含有量の割合（重量比）が１〜２であり、重量％でＬａ ２ Ｏ ３ ３０〜４８％、Ｙｂ ２ Ｏ ３ ０〜２％、ＷＯ ３ ０〜１％を含む光学ガラス（以下、本発明の光学ガラスＩという）からなることを特徴とする光学製品、
（２） 光学ガラスが、ＺｎＯを含み、ＳｉＯ２とＢ２Ｏ３との合計含有量に対するＺｎＯ含有量の割合（重量比）が０を超え２以下である上記（１）に記載の光学製品、
（３） ＳｉＯ２とＢ２Ｏ３との合計含有量に対し、Ｌａ２Ｏ３とＧｄ２Ｏ３とＹ２Ｏ３とＹｂ２Ｏ３との合計含有量の割合（重量比）が２〜４であり、かつＺｒＯ２とＴａ２Ｏ５とＮｂ２Ｏ５との合計含有量の割合（重量比）が１〜２であり、ＺｎＯの割合（重量比）が０．１〜０．５である上記（２）に記載の光学製品、
（４） ガラス組成が、重量％で、ＳｉＯ２ ３〜１０％、Ｂ２Ｏ３ ７〜１５％、ＺｎＯ ０〜１５％、ＺｒＯ２ ２〜８％およびＴａ２Ｏ５ １３〜１９％を含み、かつＳｉＯ２とＢ２Ｏ３とＧｅＯ２の合計含有量が１４〜２０％、Ｂ２Ｏ３とＺｎＯの合計含有量が９％以上およびＬａ２Ｏ３とＧｄ２Ｏ３とＹ２Ｏ３とＹｂ２Ｏ３の合計含有量が５０〜６０％であって、上記各成分の合計含有量が９５％を超える上記（１）ないし（３）のいずれか１項に記載の光学製品、
（５） 光学ガラスが、Ｌｉ２Ｏ ０〜１重量％を含む上記（４）に記載の光学製品、
（６） 光学ガラスが、Ｎｂ２Ｏ５ ０〜３重量％を含む上記（４）または（５）に記載の光学製品、
（７） 光学ガラスが、重量％で、Ｂ２Ｏ３ ９〜１２％およびＺｎＯ １〜７％を含み、かつＢ２Ｏ３とＺｎＯの合計含有量が１２％以上である上記（４）、（５）または（６）に記載の光学製品、
（８） 光学ガラスが、重量％で、ＳｉＯ２ ６〜９％、Ｂ２Ｏ３ ９〜１２％およびＧｅＯ２ ０〜５％を含み、かつＳｉＯ２とＢ２Ｏ３とＧｅＯ２の合計含有量が１６〜１９％である上記（４）ないし（７）のいずれか１項に記載の光学製品、
（９） 光学ガラスがＹｂ ２ Ｏ ３ を含まない上記（１）ないし（８）のいずれかに記載の光学製品、および
（１０） 光学ガラスの屈折率ｎdが１．８７５以上で、アッベ数νｄが３９．５以上であり、ガラス転移点Ｔｇが７００℃以下である上記（１）ないし（９）のいずれか１項に記載の光学ガラス（以下、本発明の光学ガラスＩＩという）からなる光学製品、
を提供するものである。
That is, the present invention
(1) At least one selected from La 2 O 3 , Gd 2 O 3 , Y 2 O 3 and Yb 2 O 3 , and at least selected from ZrO 2 , Ta 2 O 5 and Nb 2 O 5 A borosilicate glass containing one kind, and the total content of La 2 O 3 , Gd 2 O 3 , Y 2 O 3 and Yb 2 O 3 with respect to the total content of SiO 2 and B 2 O 3 the proportion (weight ratio) of 2 to 4, and ZrO 2 and the total content ratio of the Ta 2 O 5 and Nb 2 O 5 (weight ratio) Ri is 1-2 der, La in weight percent 2 An optical product comprising optical glass (hereinafter referred to as optical glass I of the present invention) containing O 3 30 to 48%, Yb 2 O 3 0 to 2%, and WO 3 0 to 1% ,
(2) The optical product according to (1), wherein the optical glass contains ZnO, and the ratio (weight ratio) of the ZnO content to the total content of SiO 2 and B 2 O 3 is more than 0 and 2 or less. ,
(3) The ratio (weight ratio) of the total content of La 2 O 3 , Gd 2 O 3 , Y 2 O 3 and Yb 2 O 3 is 2 with respect to the total content of SiO 2 and B 2 O 3. To 4 and the ratio (weight ratio) of the total content of ZrO 2 , Ta 2 O 5 and Nb 2 O 5 is 1 to 2, and the ratio (weight ratio) of ZnO is 0.1 to 0.3. The optical product according to (2), which is 5,
(4) a glass composition, in weight%, SiO 2 3~10%, B 2 O 3 7~15%, 0~15% ZnO, the Z rO 2 2~8% and Ta 2 O 5 13~19% And the total content of SiO 2 , B 2 O 3 and GeO 2 is 14 to 20%, the total content of B 2 O 3 and ZnO is 9% or more, and La 2 O 3 , Gd 2 O 3 and Y 2 The optical product according to any one of (1) to (3), wherein the total content of O 3 and Yb 2 O 3 is 50 to 60%, and the total content of the components exceeds 95%. ,
(5) The optical product according to (4) above , wherein the optical glass contains Li 2 O 0 to 1% by weight,
(6) The optical product according to (4) or (5) above , wherein the optical glass contains 0 to 3% by weight of Nb 2 O 5
(7) The above (4), wherein the optical glass contains 9 to 12% B 2 O 3 and 1 to 7% ZnO by weight%, and the total content of B 2 O 3 and ZnO is 12% or more, (5) or the optical product according to (6),
(8) The optical glass contains 6 to 9% of SiO 2, 9 to 12% of B 2 O 3 and 0 to 5% of GeO 2 by weight%, and the total content of SiO 2 , B 2 O 3 and GeO 2 The optical product according to any one of (4) to (7), wherein the amount is 16 to 19%,
(9) The optical product according to any one of (1) to (8) above, wherein the optical glass does not contain Yb 2 O 3 , and ( 10 ) the refractive index nd of the optical glass is 1.875 or more, and the Abbe number νd optical There are at 39.5 or more, to the glass transition point Tg of the above (1) to the 700 ° C. or less (9) of any of the optical glass (hereinafter, the optical referred glass II of the present invention) according to item 1 consisting Products,
Is to provide.
本発明の光学ガラスは、高屈折率、低分散性の光学特性を有すると共に、従来の光学ガラスに比べて安定に生産することが可能であるという特長を有する。 The optical glass of the present invention has the characteristics that it has high refractive index and low dispersibility optical characteristics and can be produced more stably than conventional optical glass.
本発明の光学ガラスは、上記（１）に記載の光学ガラスＩ、上記（９）に記載の光学ガラスＩＩ、上記（１０）に記載の光学ガラスIIIの３つの態様があり、以下、これらのガラスについて説明する。 The optical glass of the present invention has three modes, the optical glass I described in (1) above, the optical glass II described in (9) above, and the optical glass III described in (10) above. The glass will be described.
本発明の光学ガラスＩは、Ｌａ２Ｏ３、Ｇｄ２Ｏ３、Ｙ２Ｏ３およびＹｂ２Ｏ３の中から選ばれる少なくとも１種と、ＺｒＯ２、Ｔａ２Ｏ５およびＮｂ２Ｏ５の中から選ばれる少なくとも１種を含むホウケイ酸ガラスであって、ＳｉＯ２とＢ２Ｏ３との合計含有量に対し、Ｌａ２Ｏ３とＧｄ２Ｏ３とＹ２Ｏ３とＹｂ２Ｏ３との合計含有量の割合（重量比）が２〜４であり、かつＺｒＯ２とＴａ２Ｏ５とＮｂ２Ｏ５との合計含有量の割合（重量比）が１〜２である光学ガラスである。 The optical glass I of the present invention comprises at least one selected from La 2 O 3 , Gd 2 O 3 , Y 2 O 3 and Yb 2 O 3 , ZrO 2 , Ta 2 O 5 and Nb 2 O 5 . a borosilicate glass containing at least one selected from among, the total content of SiO 2 and B 2 O 3, La 2 O 3 and Gd 2 O 3 and Y 2 O 3 and Yb 2 O 3 the total percentage content (weight ratio) is 2 to 4, and optical glass proportion of the total content of ZrO 2 and Ta 2 O 5 and Nb 2 O 5 (weight ratio) is 1 to 2 and It is.
また、本発明の光学ガラスＩＩは、屈折率ｎdが１．８７５以上、アッベ数νdが３９．５以上であり、ガラス転移点Ｔｇが７００℃以下である高屈折率低分散で、かつ低ガラス転移温度の特徴を有するガラスである。 Further, the optical glass II of the present invention has a high refractive index and low dispersion having a refractive index nd of 1.875 or more, an Abbe number νd of 39.5 or more, a glass transition point Tg of 700 ° C. or less, and a low glass It is a glass having the characteristics of a transition temperature.
さらに、本発明の光学ガラスIIIは、ガラス組成が、重量％で、ＳｉＯ２ ３〜１０％、Ｂ２Ｏ３ ７〜１５％、Ｌａ２Ｏ３ ３０〜６０％、ＺｒＯ２ ２〜８％およびＴａ２Ｏ５ １３〜１９％を含み、かつＳｉＯ２とＢ２Ｏ３の合計含有量が１４〜２０％であって、上記各成分の合計含有量が９５％以上である光学ガラスである。 Further, the optical glass III of the present invention, the glass composition, in weight%, SiO 2 3~10%, B 2 O 3 7~15%, La 2 O 3 30~60%, ZrO 2 2~8% and The optical glass contains 13 to 19% Ta 2 O 5 and has a total content of SiO 2 and B 2 O 3 of 14 to 20%, and the total content of the above components is 95% or more.
上記光学ガラスＩにおいて、ＳｉＯ２とＢ２Ｏ３との合計含有量に対し、Ｌａ２Ｏ３とＧｄ２Ｏ３とＹ２Ｏ３とＹｂ２Ｏ３との合計含有量の割合（Ｌａ２Ｏ３＋Ｇｄ２Ｏ３＋Ｙ２Ｏ３＋Ｙｂ２Ｏ３）／（ＳｉＯ２＋Ｂ２Ｏ３）が、重量比で２より低いと、本発明の目的である高屈折率および高アッベ数が低くなり、Ｌａ２Ｏ３やＧｄ２Ｏ３、Ｙ２Ｏ３に比べて分散を高めるＺｎＯの含有量が制限され、その結果量産可能なガラス転移点を有する光学ガラスが得られないし、逆に４を超えると耐失透性が不十分になり、安定に量産可能な光学ガラスが得られない。したがって、ＳｉＯ２とＢ２Ｏ３との合計含有量に対し、Ｌａ２Ｏ３とＧｄ２Ｏ３とＹ２Ｏ３とＹｂ２Ｏ３との合計含有量の割合は、重量比で２〜４の範囲に限定され、好ましくは３〜４、より好ましくは３．１〜３．７の範囲である。 In the optical glass I, the ratio of the total content of La 2 O 3 , Gd 2 O 3 , Y 2 O 3 and Yb 2 O 3 to the total content of SiO 2 and B 2 O 3 (La 2 When O 3 + Gd 2 O 3 + Y 2 O 3 + Yb 2 O 3 ) / (SiO 2 + B 2 O 3 ) is lower than 2 by weight, the high refractive index and high Abbe number, which are the objects of the present invention, are lowered. , The content of ZnO that increases dispersion compared to La 2 O 3 , Gd 2 O 3 , and Y 2 O 3 is limited. As a result, an optical glass having a glass transition point that can be mass-produced cannot be obtained. If it exceeds, devitrification resistance becomes insufficient, and an optical glass that can be stably mass-produced cannot be obtained. Therefore, the ratio of the total content of La 2 O 3 , Gd 2 O 3 , Y 2 O 3 and Yb 2 O 3 with respect to the total content of SiO 2 and B 2 O 3 is 2 to 2 by weight ratio. It is limited to the range of 4, preferably 3 to 4, more preferably 3.1 to 3.7.
一方、ＳｉＯ２とＢ２Ｏ３との合計含有量に対し、ＺｒＯ２とＴａ２Ｏ５とＮｂ２Ｏ５との合計含有量の割合（ＺｒＯ２＋Ｔａ２Ｏ５＋Ｎｂ２Ｏ５）／（ＳｉＯ２＋Ｂ２Ｏ３）が、重量比で１より低いと、本発明の目的とする高屈折率を有すると共に、量産可能な安定性を有する光学ガラスが得られないし、逆に２を超えると、アッベ数νdが小さくなり、本発明の目的とする低分散の光学ガラスが得られない。したがって、ＳｉＯ２とＢ２Ｏ３との合計含有量に対し、ＺｒＯ２とＴａ２Ｏ５とＮｂ２Ｏ５との合計含有量の割合は、重量比で１〜２の範囲に限定され、好ましくは１．１〜１．５、より好ましくは１．２〜１．４の範囲である。 On the other hand, the ratio of the total content of ZrO 2 , Ta 2 O 5 and Nb 2 O 5 to the total content of SiO 2 and B 2 O 3 (ZrO 2 + Ta 2 O 5 + Nb 2 O 5 ) / ( If SiO 2 + B 2 O 3 ) is lower than 1 by weight, an optical glass having the high refractive index of the present invention and having stability that can be mass-produced cannot be obtained. The Abbe number νd becomes small, and the low-dispersion optical glass targeted by the present invention cannot be obtained. Therefore, the ratio of the total content of ZrO 2 , Ta 2 O 5 and Nb 2 O 5 with respect to the total content of SiO 2 and B 2 O 3 is limited to a range of 1-2 by weight ratio, Preferably it is 1.1-1.5, More preferably, it is the range of 1.2-1.4.
この光学ガラスＩにおいては、さらにＺｎＯを含んでいてもよく、ＳｉＯ２とＢ２Ｏ３との合計量に対するＺｎＯの含有割合ＺｎＯ／（ＳｉＯ２＋Ｂ２Ｏ３）は、重量比で０を超え２以下が好ましく、より好ましくは０を超えて１以下であり、特に好ましくは０．１〜０．５である。ＺｎＯ／（ＳｉＯ２＋Ｂ２Ｏ３）の割合が上記範囲にあることにより、ガラスを高屈折率および低分散（屈折率の波長依存性が小さい）にすると共に、耐失透性の良化および粘性流動の温度を低下させることができる。 In this optical glass I, ZnO may further be contained, and the ZnO content ratio ZnO / (SiO 2 + B 2 O 3 ) with respect to the total amount of SiO 2 and B 2 O 3 exceeds 0 by weight. 2 or less is preferable, more preferably more than 0 and 1 or less, and particularly preferably 0.1 to 0.5. When the ratio of ZnO / (SiO 2 + B 2 O 3 ) is within the above range, the glass is made to have a high refractive index and low dispersion (the refractive index has a small wavelength dependency), and the devitrification resistance is improved and The temperature of viscous flow can be reduced.
本発明の光学ガラスＩおよびＩＩにおける好ましいガラス組成としては、重量％で、ＳｉＯ２ ３〜１０％、Ｂ２Ｏ３ ７〜１５％、ＧｅＯ２ ０〜５％、ＺｎＯ ０〜１５％、Ｌａ２Ｏ３ ３０〜６０％、Ｇｄ２Ｏ３ ０〜３０％、Ｙ２Ｏ３ ０〜１０％、Ｙｂ２Ｏ３ ０〜５％、ＺｒＯ２ ２〜８％およびＴａ２Ｏ５ １３〜１９％を含み、かつＳｉＯ２とＢ２Ｏ３とＧｅＯ２の合計含有量が１４〜２０％、Ｂ２Ｏ３とＺｎＯの合計含有量が９％以上およびＬａ２Ｏ３とＧｄ２Ｏ３とＹ２Ｏ３とＹｂ２Ｏ３の合計含有量が５０〜６０％であって、上記各成分の合計含有量が９５％を超えるものを挙げることができる。 Preferred glass compositions in the optical glasses I and II of the present invention are, by weight, SiO 2 3-10%, B 2 O 3 7-15%, GeO 2 0-5%, ZnO 0-15%, La 2. O 3 30-60%, Gd 2 O 3 0-30%, Y 2 O 3 0-10%, Yb 2 O 3 0-5%, ZrO 2 2-8% and Ta 2 O 5 13-19% And the total content of SiO 2 , B 2 O 3 and GeO 2 is 14 to 20%, the total content of B 2 O 3 and ZnO is 9% or more, and La 2 O 3 , Gd 2 O 3 and Y 2 The total content of O 3 and Yb 2 O 3 is 50 to 60%, and the total content of the above components exceeds 95%.
上記ガラス組成において、ＳｉＯ２は耐失透性を維持するために必須のガラス網目形成成分であって、その含有量は３〜１０重量％の範囲が好ましい。この含有量が３重量％未満では耐失透性が不十分となるし、１０重量％を超えると屈折率が低下し、本発明の目的とする高屈折率光学ガラスが得られにくい。耐失透性および屈折率を考慮すると、このＳｉＯ２のより好ましい含有量は６〜９重量％、さらに好ましくは６．５〜８．５重量％の範囲である。 In the above glass composition, SiO 2 is an essential glass network forming component for maintaining devitrification resistance, and the content thereof is preferably in the range of 3 to 10% by weight. When the content is less than 3% by weight, the devitrification resistance is insufficient. When the content exceeds 10% by weight, the refractive index is lowered, and it is difficult to obtain the high-refractive index optical glass of the present invention. Considering devitrification resistance and refractive index, the more preferable content of SiO 2 is in the range of 6 to 9% by weight, more preferably 6.5 to 8.5% by weight.
Ｂ２Ｏ３は網目形成酸化物として、あるいはガラスの溶融性、流動粘性の温度低下に効果的な成分であって、その含有量は７〜１５重量％の範囲が好ましい。この含有量が７重量％未満ではガラスの溶融性や流動粘性の温度低下効果が十分に発揮されないし、１５重量％を超えると屈折率が低下し、本発明の目的とする高屈折率光学ガラスが得られにくい。ガラスの溶融性や流動粘性の温度低下効果および屈折率を考慮すると、このＢ２Ｏ３のより好ましい含有量は９〜１２重量％、さらに好ましくは９．５〜１１重量％の範囲である。 B 2 O 3 is a component that is effective as a network-forming oxide or for reducing the temperature of the meltability and flow viscosity of glass, and its content is preferably in the range of 7 to 15% by weight. If the content is less than 7% by weight, the temperature lowering effect of the melting property and flow viscosity of the glass is not sufficiently exhibited. If the content exceeds 15% by weight, the refractive index is lowered, and the high refractive index optical glass which is the object of the present invention. Is difficult to obtain. Considering the temperature lowering effect and the refractive index of glass meltability and flow viscosity, the more preferable content of B 2 O 3 is 9 to 12% by weight, more preferably 9.5 to 11% by weight.
ＧｅＯ２は上記ＳｉＯ２と同様の効果を有し、０〜５重量％の範囲で含有させることができる。この含有量が５重量％を超えると耐失透性が低下しやすい。 GeO 2 has the same effect as that of SiO 2 and can be contained in the range of 0 to 5% by weight. If this content exceeds 5% by weight, the devitrification resistance tends to decrease.
上記ＳｉＯ２とＢ２Ｏ３とＧｅＯ２の合計含有量は１４〜２０重量％の範囲が好ましい。この合計含有量が１４重量％未満では結晶化傾向が強くなり安定に製造可能な光学ガラスが得られにくいし、２０重量％を超えると屈折率が低下して本発明の目的とする高屈折率光学ガラスが得られにくい。結晶化傾向および屈折率を考慮すると、このＳｉＯ２とＢ２Ｏ３とＧｅＯ２のより好ましい合計含有量は１６〜１９重量％、さらに好ましくは１６〜１８重量％の範囲である。 The total content of SiO 2 , B 2 O 3 and GeO 2 is preferably in the range of 14 to 20% by weight. If the total content is less than 14% by weight, the tendency to crystallize is strong, and it is difficult to obtain an optical glass that can be stably produced. If the total content exceeds 20% by weight, the refractive index decreases and the high refractive index that is the object of the present invention is achieved. Optical glass is difficult to obtain. Considering the crystallization tendency and the refractive index, the more preferable total content of SiO 2 , B 2 O 3 and GeO 2 is in the range of 16 to 19% by weight, more preferably 16 to 18% by weight.
ＺｎＯはガラスを高屈折率および低分散（屈折率の波長依存性が小さい）にすると共に、耐失透性の良化および粘性流動の温度を低下させる効果を有する。したがって、特にＢ２Ｏ３との量の調整を行い適宜添加する成分である。具体的には、（ＳｉＯ２＋Ｂ２Ｏ３）：ＺｎＯ：（Ｌａ２Ｏ３＋Ｇｄ２Ｏ３＋Ｙ２Ｏ３＋Ｙｂ２Ｏ３）：（Ｎｂ２Ｏ５＋ＺｒＯ２＋Ｔａ２Ｏ５）を調整することにより、ｎdを１．８７５以上、νdを３９．５以上とし、かつ製造可能な耐失透性をもたせると共に、Ｂ２Ｏ３とＺｎＯの合計含有量を、好ましくは９重量％以上、より好ましくは１２重量％以上にすることで、粘性流動の温度を低下（Ｔｇを７００℃以下）することができる。このＺｎＯは０〜１５％の範囲で含有させるのが有利である。この含有量が１５重量％を超える場合、目的の範囲の屈折率を得ようとすると耐失透性が不十分になるおそれがあるし、逆に安定生産可能な耐失透性を維持しようとすると屈折率が低下し、本発明の目的とする高屈折率の光学ガラスが得られにくい。より好ましいＺｎＯの含有量は１〜７重量％の範囲、さらに好ましくは３〜５重量％の範囲である。 ZnO has the effect of making the glass have a high refractive index and a low dispersion (the refractive index has a small wavelength dependence), improves devitrification resistance, and lowers the temperature of viscous flow. Therefore, it is a component that is appropriately added by adjusting the amount of B 2 O 3 in particular. Specifically, (SiO 2 + B 2 O 3 ): ZnO: (La 2 O 3 + Gd 2 O 3 + Y 2 O 3 + Yb 2 O 3 ) :( Nb 2 O 5 + ZrO 2 + Ta 2 O 5 ) is adjusted. Thus, nd is 1.875 or more, νd is 39.5 or more, and can be produced with devitrification resistance, and the total content of B 2 O 3 and ZnO is preferably 9% by weight or more. Preferably, the temperature of viscous flow can be lowered (Tg is 700 ° C. or less) by setting it to 12% by weight or more. This ZnO is advantageously contained in the range of 0 to 15%. When this content exceeds 15% by weight, the devitrification resistance may be insufficient when trying to obtain a refractive index in the target range, and conversely, an attempt is made to maintain the devitrification resistance capable of stable production. Then, a refractive index falls and it is difficult to obtain an optical glass having a high refractive index as an object of the present invention. The content of ZnO is more preferably in the range of 1 to 7% by weight, still more preferably in the range of 3 to 5% by weight.
Ｌａ２Ｏ３は高屈折率、低分散の光学ガラスを得るための必須の成分であって、その含有量は３０〜６０重量％の範囲が好ましい。この含有量が３０重量％未満では目的とする高屈折率、低分散の光学ガラスが得られにくいし、６０重量％を超えると耐失透性が低下し、安定生産可能なガラスが得られにくい。より好ましい含有量は３７〜４８重量％、さらに好ましくは４０〜４５重量％の範囲である。 La 2 O 3 is an essential component for obtaining a high refractive index, low dispersion optical glass, and its content is preferably in the range of 30 to 60% by weight. If the content is less than 30% by weight, it is difficult to obtain the desired high refractive index and low dispersion optical glass, and if it exceeds 60% by weight, the devitrification resistance is lowered and it is difficult to obtain a glass that can be stably produced. . A more preferable content is in the range of 37 to 48% by weight, still more preferably 40 to 45% by weight.
Ｇｄ２Ｏ３は上記Ｌａ２Ｏ３との置換により０〜３０重量％の範囲で含有させることができる。この含有量が３０重量％を超えると耐失透性が低下し、安定生産可能なガラスが得られにくい。より好ましい含有量は０〜１８重量％、さらに好ましくは５〜１５重量％の範囲である。 Gd 2 O 3 can be contained in the range of 0 to 30% by weight by substitution with La 2 O 3 . When this content exceeds 30% by weight, the devitrification resistance decreases, and it is difficult to obtain a glass that can be stably produced. A more preferred content is in the range of 0 to 18% by weight, still more preferably 5 to 15% by weight.
Ｙ２Ｏ３およびＹｂ２Ｏ３もまた、上記Ｌａ２Ｏ３との置換により、それぞれ０〜１０重量％および０〜５重量％の範囲で含有させることができる。Ｙ２Ｏ３の含有量が１０重量％を超えたり、Ｙｂ２Ｏ３の含有量が５重量％を超えると耐失透性が低下し、安定生産可能なガラスが得られにくい。Ｙ２Ｏ３のより好ましい含有量は０〜６重量％、さらに好ましくは３〜６重量％の範囲である。また、Ｙｂ２Ｏ３のより好ましい含有量は０〜５重量％、さらに好ましくは０〜２重量％の範囲である。 Y 2 O 3 and Yb 2 O 3 can also be contained in the range of 0 to 10% by weight and 0 to 5% by weight, respectively, by substitution with La 2 O 3 . When the content of Y 2 O 3 exceeds 10% by weight or the content of Yb 2 O 3 exceeds 5% by weight, the devitrification resistance decreases and it is difficult to obtain a glass that can be stably produced. The more preferable content of Y 2 O 3 is 0 to 6% by weight, and more preferably 3 to 6% by weight. Further, the more preferable content of Yb 2 O 3 is 0 to 5% by weight, and more preferably 0 to 2% by weight.
上記Ｌａ２Ｏ３とＧｄ２Ｏ３、Ｙ２Ｏ３およびＹｂ２Ｏ３は、いずれも光学特性に対しては、類似する効果を有しており、これらの成分の合計含有量は５０〜６０重量％の範囲にあるのが好ましい。この合計含有量が５０重量％未満では本発明の目的とする高屈折率、低分散の光学ガラスが得られにくいし、６０重量％を超えると耐失透性が低下して、安定に生産可能な光学ガラスが得られにくい。より好ましい合計含有量は５１〜５８重量％、さらに好ましくは５４〜５６重量％の範囲である。 La 2 O 3 and Gd 2 O 3 , Y 2 O 3 and Yb 2 O 3 all have similar effects on the optical properties, and the total content of these components is 50 to It is preferably in the range of 60% by weight. If the total content is less than 50% by weight, it is difficult to obtain the high refractive index and low dispersion optical glass which is the object of the present invention, and if it exceeds 60% by weight, the devitrification resistance is lowered and can be stably produced. Optical glass is difficult to obtain. A more preferable total content is in the range of 51 to 58% by weight, still more preferably 54 to 56% by weight.
ＺｒＯ２は高屈折率をもたらす成分であり、かつ少量の添加で耐失透性を改善する効果を有している。その含有量は２〜８重量％の範囲が好ましい。この含有量が２重量％未満では高屈折率の光学ガラスが得られにくく、かつ耐失透性の改善効果が十分に発揮されないおそれがあるし、８重量％を超えると逆に耐失透性が低下し、ガラス転移点が高くなり、本発明の目的が達せられないおそれがある。より好ましい含有量は４〜８重量％、さらに好ましくは４〜６重量％の範囲である。 ZrO 2 is a component that provides a high refractive index, and has the effect of improving devitrification resistance when added in a small amount. The content is preferably in the range of 2 to 8% by weight. If the content is less than 2% by weight, it is difficult to obtain an optical glass having a high refractive index, and the effect of improving the devitrification resistance may not be sufficiently exhibited. If the content exceeds 8% by weight, the devitrification resistance is reversed. Decreases, the glass transition point becomes high, and the object of the present invention may not be achieved. A more preferable content is in the range of 4 to 8% by weight, still more preferably 4 to 6% by weight.
Ｔａ２Ｏ５は高屈折率をもたらす必須成分であり、その含有量は１３〜１９重量％の範囲が好ましい。この含有量が１３重量％未満では本発明の目的とする高屈折率の光学ガラスが得られにくいし、１９重量％を超えると耐失透性が低下すると共に、透過吸収端の長波長側へのシフトが生じるおそれがある。より好ましい含有量は１３〜１７重量％、さらに好ましくは１４〜１７重量％の範囲である。 Ta 2 O 5 is an essential component that provides a high refractive index, and its content is preferably in the range of 13 to 19% by weight. If the content is less than 13% by weight, it is difficult to obtain an optical glass having a high refractive index as the object of the present invention. If the content exceeds 19% by weight, the devitrification resistance is lowered and the transmission absorption edge is shifted to the longer wavelength side. Shift may occur. A more preferable content is in the range of 13 to 17% by weight, still more preferably 14 to 17% by weight.
本発明の光学ガラスＩおよびＩＩにおいては、前記各成分、すなわち、ＳｉＯ２、Ｂ２Ｏ３、ＧｅＯ２、ＺｎＯ、Ｌａ２Ｏ３、Ｇｄ２Ｏ３、Ｙ２Ｏ３、Ｙｂ２Ｏ３、ＺｒＯ２およびＴａ２Ｏ５の合計含有量は、９５重量％を超えることが好ましい。この合計含有量が９５重量％以下では、本発明の目的とする光学特性、粘性流動温度の低下および耐失透性のいずれをも満たす光学ガラスが得られにくい。より好ましい合計含有量は９６重量％以上、さらに好ましくは９８重量％以上である。 In the optical glasses I and II of the present invention, each of the above components, that is, SiO 2 , B 2 O 3 , GeO 2 , ZnO, La 2 O 3 , Gd 2 O 3 , Y 2 O 3 , Yb 2 O 3 , The total content of ZrO 2 and Ta 2 O 5 is preferably more than 95% by weight. When the total content is 95% by weight or less, it is difficult to obtain an optical glass satisfying all of the optical characteristics, viscosity flow temperature reduction, and devitrification resistance aimed by the present invention. A more preferable total content is 96% by weight or more, and still more preferably 98% by weight or more.
本発明の光学ガラスＩおよびＩＩにおいて、前記各成分以外に、Ｎｂ２Ｏ３、ＷＯ３、Ａｌ２Ｏ３、Ｂｉ２Ｏ３、Ｇａ２Ｏ３、ＢａＯ、ＳｒＯ、ＣａＯ、ＭｇＯ、Ｎａ２Ｏ、Ｋ２Ｏ、Ｌｉ２ＯおよびＳｂ２Ｏ３を所望により含有させることができる。 In the optical glasses I and II of the present invention, in addition to the above components, Nb 2 O 3 , WO 3 , Al 2 O 3 , Bi 2 O 3 , Ga 2 O 3 , BaO, SrO, CaO, MgO, Na 2 O , K 2 O, Li 2 O and Sb 2 O 3 can be included as desired.
Ｎｂ２Ｏ３およびＷＯ３は少量の添加によって、耐失透性を良化させる成分であり、それぞれ０〜３重量％の範囲で含有させることができる。Ｎｂ２Ｏ３の含有量が３重量％を超えたり、ＷＯ３の含有量が３重量％を超えると、ガラスの短波長域の吸収が強まり、着色を生じる原因となる。Ｎｂ２Ｏ３のより好ましい含有量は０〜１．５重量％、さらに好ましくは０．５〜１．５重量％の範囲である。また、ＷＯ３のより好ましい含有量は０〜２重量％、さらに好ましくは０〜１重量％の範囲である。 Nb 2 O 3 and WO 3 are components for improving devitrification resistance by addition of a small amount, and can be contained in the range of 0 to 3% by weight, respectively. If the content of Nb 2 O 3 exceeds 3% by weight or the content of WO 3 exceeds 3% by weight, the absorption in the short wavelength region of the glass becomes strong, which causes coloring. The more preferable content of Nb 2 O 3 is 0 to 1.5% by weight, and more preferably 0.5 to 1.5% by weight. Further, the more preferable content of WO 3 is 0 to 2% by weight, and more preferably 0 to 1% by weight.
Ｂｉ２Ｏ３は少量の添加でＴｇを低下させる効果を有する成分であり、０〜３重量％の範囲で含有させることができる。この含有量が３重量％を超えると耐失透性の低下や着色を生じる原因となる。より好ましい含有量は０〜２重量％、さらに好ましくは０〜１重量％の範囲である。 Bi 2 O 3 is a component having an effect of lowering Tg by addition of a small amount, and can be contained in a range of 0 to 3% by weight. When this content exceeds 3% by weight, devitrification resistance is lowered and coloring is caused. A more preferable content is in the range of 0 to 2% by weight, and still more preferably 0 to 1% by weight.
Ａｌ２Ｏ３およびＧａ２Ｏ３は少量の添加で耐失透性を改善する作用を有する場合があるが、同時に屈折率を低下させる作用を有している。したがって、それらの含有量は、それぞれ０〜３重量％の範囲が好ましい。Ａｌ２Ｏ３のより好ましい含有量は０〜２．５重量％、さらに好ましくは０〜０．５重量％の範囲である。 Al 2 O 3 and Ga 2 O 3 may have an effect of improving devitrification resistance by addition of a small amount, but at the same time have an effect of lowering the refractive index. Accordingly, their content is preferably in the range of 0 to 3% by weight. A more preferable content of Al 2 O 3 is in the range of 0 to 2.5% by weight, more preferably 0 to 0.5% by weight.
ＢａＯ、ＳｒＯ、ＣａＯおよびＭｇＯは、ガラス原料として炭酸塩や硝酸塩を用いることにより脱泡を促進させる効果を有しているが、その合計含有量が３重量％を超えると耐失透性が低下して、安定生産可能な光学ガラスが得られにくい。したがって、ＢａＯとＳｒＯとＣａＯとＭｇＯの合計含有量は０〜３重量％の範囲が好ましい。ＢａＯのより好ましい含有量は０〜２重量％、さらに好ましくは０〜１重量％の範囲である。また、ＳｒＯのより好ましい含有量は０〜２重量％、さらに好ましくは０〜１重量％の範囲である。 BaO, SrO, CaO and MgO have the effect of promoting defoaming by using carbonates and nitrates as glass raw materials, but devitrification resistance decreases when the total content exceeds 3% by weight. Thus, it is difficult to obtain an optical glass that can be stably produced. Therefore, the total content of BaO, SrO, CaO and MgO is preferably in the range of 0 to 3% by weight. A more preferable content of BaO is in the range of 0 to 2% by weight, more preferably 0 to 1% by weight. Further, the more preferable content of SrO is in the range of 0 to 2% by weight, more preferably 0 to 1% by weight.
Ｎａ２Ｏ、Ｋ２ＯおよびＬｉ２Ｏは、Ｔｇの低下に効果を有し、特にＬｉ２Ｏはその効果が極めて高い。しかしながら、これらの成分は耐失透性および屈折率を低下させる作用が大きいため、Ｎａ２ＯとＫ２ＯとＬｉ２Ｏの合計含有量は０〜１重量％の範囲が好ましい。Ｌｉ２Ｏのより好ましい含有量は０〜０．５重量％の範囲である。 Na 2 O, K 2 O and Li 2 O are effective in lowering Tg, and particularly Li 2 O is extremely effective. However, since these components have a large effect of reducing devitrification resistance and refractive index, the total content of Na 2 O, K 2 O and Li 2 O is preferably in the range of 0 to 1% by weight. A more preferable content of Li 2 O is in the range of 0 to 0.5% by weight.
さらに、清澄剤であるＳｂ２Ｏ３を０〜１重量％の範囲で含有させることができる。なお、このＳｂ２Ｏ３は、他の清澄剤、例えばＳｎＯ２などと置き換えることもできる。Ｓｂ２Ｏ３のより好ましい含有量は０〜０．５重量％の範囲である。 Further, the Sb 2 O 3 is a fining agent may be contained in a range of 0 to 1 wt%. The Sb 2 O 3 can be replaced with other fining agents such as SnO 2 . A more preferable content of Sb 2 O 3 is in the range of 0 to 0.5% by weight.
本発明はまた、ガラス組成が、重量％で、ＳｉＯ２ ３〜１０％、Ｂ２Ｏ３ ７〜１５％、Ｌａ２Ｏ３ ３０〜６０％、ＺｒＯ２ ２〜８％およびＴａ２Ｏ５ １３〜１９％を含み、かつＳｉＯ２とＢ２Ｏ３の合計含有量が１４〜２０％であって、上記各成分の合計含有量が９５％以上である光学ガラスIIIをも提供する。 The present invention also includes glass compositions with weight percentages of SiO 2 3-10%, B 2 O 3 7-15%, La 2 O 3 30-60%, ZrO 2 2-8% and Ta 2 O 5 13. There is also provided an optical glass III containing ˜19% and having a total content of SiO 2 and B 2 O 3 of 14 to 20% and a total content of the above components of 95% or more.
この光学ガラスIIIとしては、Ｌａ２Ｏ３の一部がＧｄ２Ｏ３および／またはＹ２Ｏ３で置換され、Ｇｄ２Ｏ３の含有量が０〜３０重量％およびＹ２Ｏ３の含有量が０〜１０重量％であり、ガラス転移点Ｔｇが７００℃以下である光学ガラスが好ましい。 As this optical glass III, a part of La 2 O 3 is substituted with Gd 2 O 3 and / or Y 2 O 3 , the content of Gd 2 O 3 is 0 to 30% by weight and the content of Y 2 O 3 An optical glass having an amount of 0 to 10% by weight and a glass transition point Tg of 700 ° C. or less is preferred.
また、光学ガラスIIIにおいては、ＺｎＯ ０〜１５重量％を含み、かつＺｎＯとＢ２Ｏ３との合計含有量が９重量％以上であるのが好ましい。特にＬａ２Ｏ３の一部がＧｄ２Ｏ３および／またはＹ２Ｏ３で置換され、Ｇｄ２Ｏ３の含有量が０〜３０重量％、Ｙ２Ｏ３の含有量が０〜１０重量％、ＺｎＯの含有量が０〜１５重量％、Ｎｂ２Ｏ５の含有量が０〜３重量％およびＬｉ２Ｏの含有量が０〜１重量％であり、ガラス転移点Ｔｇが７００℃以下であるものが好適である。 In the optical glass III, it is preferable that ZnO is contained in an amount of 0 to 15% by weight, and the total content of ZnO and B 2 O 3 is 9% by weight or more. Particularly, a part of La 2 O 3 is substituted with Gd 2 O 3 and / or Y 2 O 3 , the content of Gd 2 O 3 is 0 to 30% by weight, and the content of Y 2 O 3 is 0 to 10% by weight. %, ZnO content is 0 to 15% by weight, Nb 2 O 5 content is 0 to 3% by weight, Li 2 O content is 0 to 1% by weight, and glass transition point Tg is 700 ° C. or less. Are preferred.
この光学ガラスIIIにおける範囲の限定理由及び好ましい範囲などは、前記光学ガラスＩにおいて説明したとおりである。 The reason for limiting the range and the preferable range of the optical glass III are as described in the optical glass I.
本発明の光学製品の製造方法によれば、前述の本発明の光学ガラスを溶解工程、プレス成形工程を経て成形したガラスを、ガラス転移点付近の温度、例えば７２０℃以下、ガラスによっては７００℃以下でアニール処理することにより、レンズ、プリズムなどの光学製品が得られる。 According to the method for producing an optical product of the present invention, the glass obtained by molding the above-described optical glass of the present invention through a melting step and a press molding step is subjected to a temperature near the glass transition point, for example, 720 ° C. or less, and 700 ° C. depending on the glass By annealing the following, optical products such as lenses and prisms can be obtained.
また、本発明の光学ガラスを溶解工程、成形工程を経て予備成形したガラスプリフォームを、プレス成形に適した温度（粘度が１０５〜１０８ポアズに相当する温度）、例えば８５０℃に再加熱して軟化させ、これをプレス成形したガラスを、ガラス転移点付近の温度、例えば７２０℃以下、ガラスによっては７００℃以下でアニール処理することにより、レンズ、プリズムなどの光学製品が得られる。 Further, a glass preform obtained by preforming the optical glass of the present invention through a melting step and a molding step is reheated to a temperature suitable for press molding (a temperature corresponding to a viscosity of 10 5 to 10 8 poise), for example, 850 ° C. Then, the glass that has been softened and press-molded is annealed at a temperature near the glass transition point, for example, 720 ° C. or lower, or 700 ° C. or lower depending on the glass, whereby optical products such as lenses and prisms can be obtained.
次に、本発明を実施例により、さらに詳細に説明するが、本発明は、これらの例によってなんら限定されるものではない。
実施例１〜１０および比較例１、２
表１〜表３に示すガラス組成になるように、原料として炭酸塩、硝酸塩、水酸化物、酸化物などを用い、各原料粉末をよく混合したのち、白金製坩堝に入れ、１４００℃に設定された炉内で溶融し、撹拌、清澄後適当な温度に予熱した鉄製枠に流し込み、Ｔｇ近傍の温度で２時間保持したのち、徐冷して光学ガラスを作製した。
EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
Examples 1 to 10 and Comparative Examples 1 and 2
Carbonates, nitrates, hydroxides, oxides, etc. are used as raw materials so that the glass compositions shown in Tables 1 to 3 are obtained. After thoroughly mixing the raw material powders, they are put in a platinum crucible and set to 1400 ° C. It was melted in the furnace, stirred and clarified, poured into an iron frame preheated to an appropriate temperature, held at a temperature near Tg for 2 hours, and then slowly cooled to produce an optical glass.
なお、光学ガラスの特性は、以下に示す方法により測定した。その結果を表１〜表３に示す。
（１）屈折率［ｎd］およびアッベ数［νd］
１時間当たり、３０℃の降温速度で冷却した光学ガラスについて測定した。
（２）ガラス転移点Ｔｇ
熱機械分析装置を用いて、昇温速度４℃／分の条件下で測定した。
（３）液相温度［Ｌ.Ｔ.］
５０ミリリットルの白金製坩堝にガラスを入れ、蓋を付けて炉内に所定の温度で２時間保持し、冷却後ガラス内部を１００倍の顕微鏡で観察し、結晶の有無から、液相温度を決定した。なお、温度は１０℃刻みで変化させた。
（４）λ８０
１０ｍｍ厚の研磨サンプルについて、分光透過率を測定した際の透過率８０％の波長（ｎｍ）を求めた。
In addition, the characteristic of optical glass was measured by the method shown below. The results are shown in Tables 1 to 3.
(1) Refractive index [nd] and Abbe number [νd]
It measured about the optical glass cooled with the temperature-fall rate of 30 degreeC per hour.
(2) Glass transition point Tg
Using a thermomechanical analyzer, the measurement was performed under the condition of a heating rate of 4 ° C./min.
(3) Liquidus temperature [LT]
Put the glass in a 50 ml platinum crucible, put a lid on it and hold it in the furnace for 2 hours at a specified temperature. did. The temperature was changed in increments of 10 ° C.
(4) λ80
For a 10 mm thick polished sample, the wavelength (nm) of the transmittance of 80% when the spectral transmittance was measured was determined.
表１、表２および表３の実施例に示すように、本発明のガラスにおいては、ｎdが１．８７５以上で、νdが３９．５以上であると共に、実施例１〜６ではＴｇが７００℃以下、実施例７〜１０ではＴｇが７０７〜７１３℃以下であることが分かる。 As shown in the examples of Table 1, Table 2, and Table 3, in the glass of the present invention, nd is 1.875 or more, νd is 39.5 or more, and in Examples 1 to 6, Tg is 700. It can be seen that Tg is 707 to 713 ° C. or lower in Examples 7 to 10 ° C. or lower.
一方、比較例１は、（Ｎｂ２Ｏ５＋ＺｒＯ２＋Ｔａ２Ｏ５）／（ＳｉＯ２＋Ｂ２Ｏ３）が１．０７９で１．２未満であり、Ｔｇが７３５℃と高い。また、比較例２は、（Ｌａ２Ｏ３＋Ｇｄ２Ｏ３＋Ｙ２Ｏ３＋Ｙｂ２Ｏ５）／（ＳｉＯ２＋Ｂ２Ｏ３）が１．９６７で３．１未満であり、ｎdが１．８６と低い。 On the other hand, in Comparative Example 1, (Nb 2 O 5 + ZrO 2 + Ta 2 O 5 ) / (SiO 2 + B 2 O 3 ) is 1.079, less than 1.2, and Tg is as high as 735 ° C. In Comparative Example 2, (La 2 O 3 + Gd 2 O 3 + Y 2 O 3 + Yb 2 O 5 ) / (SiO 2 + B 2 O 3 ) is 1.967, which is less than 3.1, and nd is 1. 86 and low.
また、本発明の実施例６で得られた光学ガラスを、８５０℃の電気炉に５分間保持した結果、十分に軟化した。一方、比較例１で得られた光学ガラスではほとんど軟化が起こらなかった。このことは、本発明の光学ガラスは、従来の光学ガラスに比べて低温で再加熱プレスが可能なことを示している。 Further, the optical glass obtained in Example 6 of the present invention was sufficiently softened as a result of being held in an electric furnace at 850 ° C. for 5 minutes. On the other hand, the optical glass obtained in Comparative Example 1 hardly softened. This indicates that the optical glass of the present invention can be reheated and pressed at a lower temperature than the conventional optical glass.
本発明によれば、高屈折率で低分散の光学特性を有すると共に、安定生産が可能な光学ガラス、およびそれを用いた光学製品の製造方法を提供することが可能となる。 According to the present invention, it is possible to provide an optical glass having high refractive index and low dispersion optical characteristics and capable of stable production, and an optical product manufacturing method using the same.
Claims (10)
The optical product according to any one of claims 1 to 9, wherein the optical glass has a refractive index nd of 1.875 or more, an Abbe number νd of 39.5 or more, and a glass transition point Tg of 700 ° C or less.
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