JP2000159537A - Optical glass - Google Patents
Optical glassInfo
- Publication number
- JP2000159537A JP2000159537A JP10330396A JP33039698A JP2000159537A JP 2000159537 A JP2000159537 A JP 2000159537A JP 10330396 A JP10330396 A JP 10330396A JP 33039698 A JP33039698 A JP 33039698A JP 2000159537 A JP2000159537 A JP 2000159537A
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- JP
- Japan
- Prior art keywords
- less
- refractive index
- optical glass
- specific gravity
- abbe number
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
- C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はカメラや眼鏡のレン
ズ等に使用される光学ガラスの改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an optical glass used for a lens of a camera or spectacles.
【０００２】[0002]
【従来の技術】カメラや眼鏡等のレンズの薄型化や軽量
化に伴い、より大きな屈折率で軽量かつ低分散の光学ガ
ラスが必要となってきている。従来の屈折率の大きい光
学ガラスはＢ2Ｏ3、Ｌａ2Ｏ3、ＰｂＯ、ＣａＯ等を主成
分としており広く使用されている。2. Description of the Related Art As lenses such as cameras and spectacles have become thinner and lighter, there has been a need for lighter, lower-dispersion optical glass having a larger refractive index. Conventional optical glasses having a large refractive index contain B 2 O 3 , La 2 O 3 , PbO, CaO and the like as main components and are widely used.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、光学ガ
ラスの屈折率を高くするためにＬａ2Ｏ3やＰｂＯを多く
すると比重が大きくなるとともに、分散が大きくなる問
題があった。本発明は高屈折率で比重が低く、低分散の
光学ガラスを提供することを目的とする。However, when La 2 O 3 or PbO is increased to increase the refractive index of the optical glass, there is a problem that the specific gravity increases and the dispersion increases. An object of the present invention is to provide an optical glass having a high refractive index, a low specific gravity, and a low dispersion.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に請求項１に記載された発明は、主成分の組成範囲を、
ＳｉＯ2 が ２ｗｔ％以上で且つ １０ｗｔ％以下、Ｂ
2Ｏ3 が１８ｗｔ％以上で且つ ３０ｗｔ％以下、Ｚｒ
Ｏ2 が ７ｗｔ％より多く且つ１５ｗｔ％以下、Ｌａ2
Ｏ3が１４ｗｔ％より多く且つ２７ｗｔ％以下、ＴｉＯ
2 が１５ｗｔ％より多く且つ３０ｗｔ％以下、にしたこ
とを特徴としている。Means for Solving the Problems In order to achieve the above object, the invention described in claim 1 provides a composition range of a main component,
SiO 2 is 2 wt% or more and 10 wt% or less, B
2 O 3 18 wt% or more and 30 wt% or less, Zr
O 2 is more than 7 wt% and not more than 15 wt%, La 2
O 3 is more than 14 wt% and 27 wt% or less, TiO
2 is more than 15 wt% and not more than 30 wt%.
【０００５】また請求項２に記載された発明は、請求項
１に記載した光学ガラスにおいて、以下の組成範囲の添
加物を少なくとも１種類添加したことを特徴としてい
る。ＣａＯ が２７ｗｔ％以下、Ｎｂ2Ｏ5が２０ｗｔ％
以下。According to a second aspect of the present invention, in the optical glass according to the first aspect, at least one additive having the following composition range is added. CaO is 27 wt% or less, Nb 2 O 5 is 20 wt%
Less than.
【０００６】また請求項３に記載された発明は、請求項
１に記載した光学ガラスにおいて、以下の組成範囲の添
加物を少なくとも１種類添加したことを特徴としてい
る。ＣａＯ が２７ｗｔ％以下、Ｎｂ2Ｏ5が２０ｗｔ％
以下、ＭｇＯ が ８ｗｔ％以下、ＳｒＯ が ５ｗｔ
％以下、ＢａＯ が ５ｗｔ％以下、ＺｎＯ が ８ｗ
ｔ％以下、Ｙ2Ｏ3 が ８ｗｔ％以下、Ｇｄ2Ｏ3が ５
ｗｔ％以下、Ｔａ2Ｏ5が ５ｗｔ％以下、ＷＯ3 が
３ｗｔ％以下、Ａｌ2Ｏ3が ５ｗｔ％以下、ＧｅＯ2 が
３ｗｔ％以下、Ｌｉ2Ｏ が ３ｗｔ％以下、Ｎａ2Ｏ
が ２ｗｔ％以下、Ｋ2Ｏ が ２ｗｔ％以下、Ｓｂ2
Ｏ3が １ｗｔ％以下、Ａｓ2Ｏ3が １ｗｔ％以下。According to a third aspect of the present invention, in the optical glass of the first aspect, at least one additive having the following composition range is added. CaO is 27 wt% or less, Nb 2 O 5 is 20 wt%
Below, MgO is 8 wt% or less, SrO is 5 wt%
%, BaO 5 wt% or less, ZnO 8 w
t% or less, Y 2 O 3 is 8 wt% or less, Gd 2 O 3 is 5
wt% or less, Ta 2 O 5 is 5 wt% or less, WO 3 is
3 wt% or less, Al 2 O 3 is less 5 wt%, GeO 2 is less 3wt%, Li 2 O is less 3wt%, Na 2 O
2% by weight or less, K 2 O 2% by weight or less, Sb 2
O 3 is 1 wt% or less, and As 2 O 3 is 1 wt% or less.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施形態について
説明する。本実施形態の光学ガラスは主成分の組成範囲
をＳｉＯ2 が ２ｗｔ％以上で且つ １０ｗｔ％以下、
Ｂ2Ｏ3 が１８ｗｔ％以上で且つ ３０ｗｔ％以下、Ｚ
ｒＯ2 が ７ｗｔ％より多く且つ１５ｗｔ％以下、Ｌａ
2Ｏ3が１４ｗｔ％より多く且つ２７ｗｔ％以下、ＴｉＯ
2 が１５ｗｔ％より多く且つ３０ｗｔ％以下、としてい
る。Embodiments of the present invention will be described below. In the optical glass of this embodiment, the composition range of the main component is such that SiO 2 is 2 wt% or more and 10 wt% or less,
B 2 O 3 is 18 wt% or more and 30 wt% or less, Z
rO 2 is and more than 7wt% 15wt% or less, La
2 O 3 is more than 14 wt% and not more than 27 wt%, TiO
2 is more than 15 wt% and not more than 30 wt%.
【０００８】このような光学ガラスは各原料を混合し、
白金容器にて１２００〜１４００℃で溶融する。そし
て、攪拌による脱泡を行い、除冷によって清澄及び均質
化を行った後、再加熱して金型成形を行い、アニールに
より歪みを除去して得ることができる。上記組成比はア
ニール終了後の組成比を示している。[0008] Such an optical glass mixes each raw material,
Melt at 1200-1400 ° C in a platinum container. Then, after defoaming by stirring, clarifying and homogenizing by decooling, reheating is performed to mold, and distortion can be removed by annealing to obtain. The above composition ratio indicates the composition ratio after the completion of annealing.
【０００９】そして、上記組成範囲にすると、ｄ線に対
する屈折率ｎｄが１．８８以上で且つ１．９２以下、ｄ
線に対するアッベ数νｄが２８以上で且つ３２以下、比
重ｓｇが４未満の光学ガラスを安定して成形性や溶融性
を劣化させることなく得ることができる。In the above composition range, the refractive index nd with respect to d-line is 1.88 or more and 1.92 or less, and d
An optical glass having an Abbe number νd of 28 or more and 32 or less and a specific gravity sg of less than 4 with respect to a line can be obtained stably without deteriorating the formability and the melting property.
【００１０】ここで、ＳｉＯ2及びＢ2Ｏ3はガラスを形
成するために必要な材料であり、ＴｉＯ2及びＺｒＯ2に
より比重ｓｇを小さくし、ＴｉＯ2、ＺｒＯ2及びＬａ2
Ｏ3により屈折率ｎｄ及びアッベ数νｄを大きくしてい
る。[0010] Here, SiO 2 and B 2 O 3 is a material necessary for forming the glass, to reduce the specific gravity sg by TiO 2 and ZrO 2, TiO 2, ZrO 2 and La 2
O 3 increases the refractive index nd and Abbe number νd.
【００１１】ＳｉＯ2は２ｗｔ％未満であると溶融時の
粘性が低下して成形が困難となり、１０ｗｔ％より多く
なるとガラスが失透し易くなるとともに溶融時に未溶物
が残りやすくなるので２ｗｔ％以上で且つ１０ｗｔ％以
下にする必要がある。Ｂ2Ｏ3は、１８ｗｔ％以上添加し
ないと溶融性が悪くなるが屈折率ｎｄを小さくするので
１８ｗｔ％以上で且つ３０ｗｔ％以下にする必要があ
る。If the content of SiO 2 is less than 2% by weight, the viscosity at the time of melting is lowered and molding is difficult. It is necessary that the amount is not less than 10 wt%. If B 2 O 3 is not added in an amount of 18 wt% or more, the meltability deteriorates, but the refractive index nd is reduced, so that it is necessary to be 18 wt% or more and 30 wt% or less.
【００１２】ＴｉＯ2は比重ｓｇを小さくし屈折率ｎｄ
を大きくするために１５ｗｔ％より多く必要であるが、
３０ｗｔ％より多くなるとアッベ数νｄが小さくなるの
で、１５ｗｔ％より多く且つ３０ｗｔ％以下にする必要
がある。ＺｒＯ2は屈折率ｎｄを大きくすると同時にア
ッベ数νｄを大きくするために７ｗｔ％より多く必要で
あるが、１５ｗｔ％より多いとガラスが失透し易くなる
ので１５ｗｔ％以下とする方がよい。TiO 2 reduces the specific gravity sg and reduces the refractive index nd.
More than 15 wt% is required to increase
If it exceeds 30 wt%, the Abbe number νd becomes small, so it is necessary to make it more than 15 wt% and 30 wt% or less. ZrO 2 needs to be more than 7 wt% to increase the refractive index nd and the Abbe number νd at the same time, but if it is more than 15 wt%, the glass tends to be devitrified.
【００１３】Ｌａ2Ｏ3は屈折率ｎｄを大きくするために
１４ｗｔ％より多く必要であり、同時にアッベ数νｄを
大きくすることができるが、２７ｗｔ％より多いと比重
が大きくなるので、１４ｗｔ％より多く且つ２７ｗｔ％
以下にする必要がある。La 2 O 3 needs to be more than 14 wt% in order to increase the refractive index nd. At the same time, the Abbe number νd can be increased. However, if it is more than 27 wt%, the specific gravity becomes large. Many and 27wt%
It must be:
【００１４】また、上記組成に以下の添加物を添加する
ことができる。ＣａＯはアッベ数νｄを大きくするとと
もに比重ｓｇを小さくすることができるので添加する方
が望ましいが、２７ｗｔ％より多くなるとガラスが失透
し易くなるので２７ｗｔ％以下の範囲で添加する必要が
ある。Further, the following additives can be added to the above composition. It is desirable to add CaO because it can increase the Abbe number νd and reduce the specific gravity sg, but if it exceeds 27 wt%, the glass tends to be devitrified. Therefore, it is necessary to add CaO in a range of 27 wt% or less.
【００１５】屈折率ｎｄを大きくする材料として、Ｎｂ
2Ｏ5、Ｇｄ2Ｏ3、Ｔａ2Ｏ5、及びＧｅＯ2を添加するこ
とができる。特に、Ｎｂ2Ｏ5は屈折率ｎｄを大きくする
効果が大きいので添加する方が望ましいが、比重ｓｇが
大きくなるので２０ｗｔ％以下の範囲で一部のＴｉＯ2
と置換する方が望ましい。As a material for increasing the refractive index nd, Nb
2 O 5 , Gd 2 O 3 , Ta 2 O 5 , and GeO 2 can be added. In particular, Nb 2 O 5 is the refractive index is desirably better to add the effect of increasing the nd is large, a portion of the TiO 2 in the range of 20 wt% or less specific gravity sg increases
It is preferable to replace with
【００１６】Ｇｄ2Ｏ3はＬａ2Ｏ3と同等の大きな屈折率
ｎｄが得られるが比重ｓｇが大きくなるので５ｗｔ％以
下にする方がよい。Ｔａ2Ｏ5は高価であるので５ｗｔ％
以下にする方がよく、ＧｅＯ2は比重ｓｇが大きくなる
ので３ｗｔ％以下の範囲でＳｉＯ2と置換して使用する
のが望ましい。Gd 2 O 3 has a large refractive index nd equivalent to that of La 2 O 3 , but the specific gravity sg increases, so it is better to make it 5 wt% or less. Ta 2 O 5 5wt% because it is expensive
It is more preferable that GeO 2 be replaced with SiO 2 in a range of 3 wt% or less because GeO 2 has a large specific gravity sg.
【００１７】アッベ数νｄを大きくするためにＹ2Ｏ3を
添加してもよいが失透し易くなるので８ｗｔ％以下にす
る方がよい。ＭｇＯ、ＳｒＯ、ＢａＯ及びＺｎＯを屈折
率の調整のため添加することができるが、ＭｇＯは屈折
率ｎｄを小さくするので８ｗｔ％以下がよく、ＳｒＯ、
ＢａＯ及びＺｎＯは比重ｓｇを大きくするのでそれぞれ
５ｗｔ％、５ｗｔ％、８ｗｔ％以下がよい。Y 2 O 3 may be added to increase the Abbe number νd, but it is preferable to make the content 8 wt% or less because devitrification is likely to occur. MgO, SrO, BaO and ZnO can be added to adjust the refractive index. However, MgO is preferably 8 wt% or less because it reduces the refractive index nd.
Since BaO and ZnO increase the specific gravity sg, they are preferably 5 wt%, 5 wt%, and 8 wt% or less, respectively.
【００１８】ＷＯ3はガラスの液相温度を下げるが、３
ｗｔ％より多いと着色度が悪くなるので３ｗｔ％以下の
範囲で添加してもよい。Ａｌ2Ｏ3はガラスの耐久性を向
上させるが５ｗｔ％より多いと屈折率ｎｄが小さくなる
とともに失透し易くなるので５ｗｔ％以下の範囲で添加
してもよい。WO 3 lowers the liquidus temperature of glass.
If it is more than wt%, the degree of coloring will be poor, so it may be added in a range of 3 wt% or less. Although Al 2 O 3 improves the durability of the glass, if it is more than 5 wt%, the refractive index nd becomes small and the glass tends to be devitrified. Therefore, it may be added in the range of 5 wt% or less.
【００１９】Ｌｉ2Ｏ、Ｎａ2Ｏ及びＫ2Ｏは溶融性を向
上させることができるので添加してもよいが、屈折率ｎ
ｄを小さくするとともに添加量が多いと失透しやすくな
るので、それぞれ３ｗｔ％、２ｗｔ％、２ｗｔ％以下の
範囲で添加する方がよい。Li 2 O, Na 2 O and K 2 O can be added because they can improve the melting property, but the refractive index n
If d is reduced and the amount of addition is large, the glass tends to be devitrified.
【００２０】また、Ｓｂ2Ｏ3やＡｓ2Ｏ3を１ｗｔ％以下
の範囲で添加してもよく、他に清澄、着色、消色等の目
的で清澄剤や着色剤等を微量添加してもよい。Further, Sb 2 O 3 or As 2 O 3 may be added in a range of 1 wt% or less. In addition, a small amount of a fining agent or a coloring agent may be added for the purpose of fining, coloring and decoloring. Is also good.
【００２１】[0021]
【実施例】本発明の実施例について以下に述べる。表１
に第１〜第１０実施例の光学ガラスを構成する材料組成
比（単位：ｗｔ％）、ｄ線に対する屈折率ｎｄ、ｄ線に
対するアッベ数νｄ、及び比重ｓｇを示す。Embodiments of the present invention will be described below. Table 1
Table 2 shows the material composition ratio (unit: wt%), the refractive index nd for d-line, the Abbe number νd for d-line, and the specific gravity sg of the optical glasses of the first to tenth examples.
【００２２】[0022]
【表１】 [Table 1]
【００２３】第１実施例の光学ガラスは、ＳｉＯ2を４
ｗｔ％、Ｂ2Ｏ3を２４．５ｗｔ％、ＣａＯを１１ｗｔ
％、ＺｒＯ2を１４．５ｗｔ％、Ｌａ2Ｏ3を２６．５ｗ
ｔ％、ＴｉＯ2を１９．５ｗｔ％の組成比にしている。
その結果、屈折率ｎｄ＝１．８８、アッベ数νｄ＝３
０．０、比重ｓｇ＝３．８４の特性が得られた。The optical glass of the first embodiment, the SiO 2 4
wt%, B 2 O 3 of 24.5 wt%, the CaO 11 wt
%, ZrO 2 14.5 wt%, La 2 O 3 26.5 w
t%, it has a TiO 2 composition ratio of 19.5 wt%.
As a result, the refractive index nd = 1.88 and the Abbe number νd = 3
The characteristics of 0.0 and specific gravity sg = 3.84 were obtained.
【００２４】第２実施例の光学ガラスは、ＳｉＯ2を３
ｗｔ％、Ｂ2Ｏ3を２４．４ｗｔ％、ＣａＯを１５．５ｗ
ｔ％、ＺｒＯ2を７．５ｗｔ％、Ｎｂ2Ｏ5を１８．５ｗ
ｔ％、Ｌａ2Ｏ3を１５．５ｗｔ％、ＴｉＯ2を１５．５
ｗｔ％、Ｓｂ2Ｏ3を０．１ｗｔ％の組成比にしている。
その結果、屈折率ｎｄ＝１．８８、アッベ数νｄ＝２
８．０、比重ｓｇ＝３．６７の特性が得られた。In the optical glass of the second embodiment, SiO 2
wt%, B 2 O 3 to 24.4wt%, the CaO 15.5 W
t%, ZrO 2 7.5 wt%, Nb 2 O 5 18.5 w
t%, 15.5wt% of La 2 O 3, and TiO 2 15.5
The composition ratio of Sb 2 O 3 is 0.1 wt%.
As a result, the refractive index nd = 1.88 and the Abbe number νd = 2
The characteristics of 8.0 and specific gravity sg = 3.67 were obtained.
【００２５】第３実施例の光学ガラスは、ＳｉＯ2を３
ｗｔ％、Ｂ2Ｏ3を２１．５ｗｔ％、ＣａＯを２６ｗｔ
％、ＺｒＯ2を７．５ｗｔ％、Ｌａ2Ｏ3を１４．５ｗｔ
％、ＴｉＯ2を２７．４ｗｔ％、Ａｓ2Ｏ3を０．１ｗｔ
％の組成比にしている。その結果、屈折率ｎｄ＝１．８
９、アッベ数νｄ＝２８．０、比重ｓｇ＝３．５７の特
性が得られた。In the optical glass of the third embodiment, SiO 2
wt%, B 2 O 3 of 21.5 wt%, the CaO 26 wt
%, ZrO 2 7.5 wt%, La 2 O 3 14.5 wt%
%, TiO 2 27.4 wt%, As 2 O 3 0.1 wt%
% Composition ratio. As a result, the refractive index nd = 1.8
9, the characteristics of Abbe number νd = 28.0 and specific gravity sg = 3.57 were obtained.
【００２６】第４実施例の光学ガラスは、ＳｉＯ2を５
ｗｔ％、Ｂ2Ｏ3を２３ｗｔ％、ＣａＯを９．５ｗｔ％、
ＺｒＯ2を７．５ｗｔ％、Ｎｂ2Ｏ5を２．４ｗｔ％、Ｌ
ａ2Ｏ3を１６．５ｗｔ％、Ｙ2Ｏ3を７．５ｗｔ％、Ｇｄ
2Ｏ3を３ｗｔ％、Ｔａ2Ｏ5を３ｗｔ％、ＴｉＯ2を２
１．５ｗｔ％、ＷＯ3を１ｗｔ％、Ａｓ2Ｏ3を０．１ｗ
ｔ％の組成比にしている。その結果、屈折率ｎｄ＝１．
８９、アッベ数νｄ＝２８．２、比重ｓｇ＝３．８４の
特性が得られた。In the optical glass of the fourth embodiment, SiO 2
wt%, B 2 O 3 to 23 wt%, 9.5 wt% of CaO,
7.5 wt% of ZrO 2 , 2.4 wt% of Nb 2 O 5 , L
a 2 O 3 of 16.5 wt%, 7.5 wt% of Y 2 O 3, Gd
3% by weight of 2 O 3 , 3% by weight of Ta 2 O 5 and 2 % of TiO 2
1.5 wt%, 1 wt% of WO 3, 0.1 w the As 2 O 3
The composition ratio is t%. As a result, the refractive index nd = 1.
89, Abbe number νd = 28.2, specific gravity sg = 3.84.
【００２７】第５実施例の光学ガラスは、ＳｉＯ2を２
ｗｔ％、Ｂ2Ｏ3を２４ｗｔ％、ＣａＯを７ｗｔ％、Ｂａ
Ｏを３ｗｔ％、ＺｎＯを７ｗｔ％、ＺｒＯ2を８ｗｔ
％、Ｎｂ2Ｏ5を２．５ｗｔ％、Ｌａ2Ｏ3を２０．４ｗｔ
％、ＴｉＯ2を２２ｗｔ％、ＧｅＯ2を２ｗｔ％、Ｌｉ2
Ｏを２ｗｔ％、Ｓｂ2Ｏ3を０．１ｗｔ％の組成比にして
いる。その結果、屈折率ｎｄ＝１．８９、アッベ数νｄ
＝２８．０、比重ｓｇ＝３．８３の特性が得られた。The optical glass of the fifth embodiment, the SiO 2 2
wt%, B 2 O 3 to 24 wt%, 7 wt% of CaO, Ba
O 3 wt%, ZnO 7 wt%, ZrO 2 8 wt
%, Nb 2 O 5 2.5 wt%, La 2 O 3 20.4 wt%
%, TiO 2 22 wt%, GeO 2 2 wt%, Li 2
The composition ratio of O is 2 wt% and Sb 2 O 3 is 0.1 wt%. As a result, the refractive index nd = 1.89 and the Abbe number νd
= 28.0 and specific gravity sg = 3.83.
【００２８】第６実施例の光学ガラスは、ＳｉＯ2を３
ｗｔ％、Ｂ2Ｏ3を２５ｗｔ％、ＭｇＯを７ｗｔ％、Ｓｒ
Ｏを３ｗｔ％、ＺｒＯ2を８．５ｗｔ％、Ｎｂ2Ｏ5を４
ｗｔ％、Ｌａ2Ｏ3を２７ｗｔ％、ＴｉＯ2を２１．５ｗ
ｔ％、Ｎａ2Ｏを１ｗｔ％の組成比にしている。その結
果、屈折率ｎｄ＝１．８８、アッベ数νｄ＝２８．０、
比重ｓｇ＝３．７８の特性が得られた。In the optical glass of the sixth embodiment, SiO 2
wt%, B 2 O 3 to 25 wt%, 7 wt% of MgO, Sr
O 3 wt%, ZrO 2 8.5 wt%, Nb 2 O 5 4
wt%, 27 wt% of La 2 O 3, a TiO 2 21.5w
t%, it has a Na 2 O to 1 wt% of the composition ratio. As a result, the refractive index nd = 1.88, the Abbe number νd = 28.0,
A characteristic having a specific gravity of sg = 3.78 was obtained.
【００２９】第７実施例の光学ガラスは、ＳｉＯ2を４
ｗｔ％、Ｂ2Ｏ3を２０ｗｔ％、ＣａＯを９．５ｗｔ％、
ＺｒＯ2を８．５ｗｔ％、Ｌａ2Ｏ3を２７ｗｔ％、Ｙ2Ｏ
3を４ｗｔ％、ＴｉＯ2を２２ｗｔ％、Ａｌ2Ｏ3を４ｗｔ
％、Ｋ2Ｏを０．９ｗｔ％、Ｓｂ2Ｏ3を０．１ｗｔ％の
組成比にしている。その結果、屈折率ｎｄ＝１．８８、
アッベ数νｄ＝２９．０、比重ｓｇ＝３．８４の特性が
得られた。In the optical glass of the seventh embodiment, SiO 2
wt%, B 2 O 3 to 20 wt%, 9.5 wt% of CaO,
8.5 wt% of ZrO 2 , 27 wt% of La 2 O 3 , Y 2 O
3 4 wt%, TiO 2 22 wt%, Al 2 O 3 4 wt
%, K 2 O is 0.9 wt%, and Sb 2 O 3 is 0.1 wt%. As a result, the refractive index nd = 1.88,
The characteristics of Abbe number νd = 29.0 and specific gravity sg = 3.84 were obtained.
【００３０】第８実施例の光学ガラスは、ＳｉＯ2を８
ｗｔ％、Ｂ2Ｏ3を２１．５ｗｔ％、ＣａＯを７．５ｗｔ
％、ＺｒＯ2を９．５ｗｔ％、Ｎｂ2Ｏ5を２．５ｗｔ
％、Ｌａ2Ｏ3を２６ｗｔ％、Ｙ2Ｏ3を３．５ｗｔ％、Ｔ
ｉＯ2を２１．５ｗｔ％の組成比にしている。その結
果、屈折率ｎｄ＝１．８９、アッベ数νｄ＝２８．４、
比重ｓｇ＝３．８５の特性が得られた。In the optical glass of the eighth embodiment, SiO 2
wt%, B 2 O 3 of 21.5 wt%, the CaO 7.5 wt
%, ZrO 2 9.5 wt%, Nb 2 O 5 2.5 wt%
%, La 2 O 3 at 26 wt%, Y 2 O 3 at 3.5 wt%, T
The composition ratio of iO 2 is 21.5 wt%. As a result, the refractive index nd = 1.89, the Abbe number νd = 28.4,
The characteristic of specific gravity sg = 3.85 was obtained.
【００３１】第９実施例の光学ガラスは、ＳｉＯ2を３
ｗｔ％、Ｂ2Ｏ3を２２ｗｔ％、ＣａＯを１４ｗｔ％、Ｚ
ｒＯ2を１１．５ｗｔ％、Ｌａ2Ｏ3を２７ｗｔ％、Ｙ2Ｏ
3を５．５ｗｔ％、ＴｉＯ2を１７ｗｔ％の組成比にして
いる。その結果、屈折率ｎｄ＝１．８８、アッベ数νｄ
＝３１．９、比重ｓｇ＝３．９５の特性が得られた。In the optical glass of the ninth embodiment, SiO 2
wt%, B 2 O 3 to 22 wt%, 14 wt% of CaO, Z
rO 2 11.5 wt%, La 2 O 3 27 wt%, Y 2 O
3 has a composition ratio of 5.5 wt% and TiO 2 has a composition ratio of 17 wt%. As a result, the refractive index nd = 1.88 and the Abbe number νd
= 31.9 and specific gravity sg = 3.95.
【００３２】第１０実施例の光学ガラスは、ＳｉＯ2を
２ｗｔ％、Ｂ2Ｏ3を２３ｗｔ％、ＣａＯを１０ｗｔ％、
ＺｒＯ2を１１．４ｗｔ％、Ｎｂ2Ｏ5を１ｗｔ％、Ｌａ2
Ｏ3を２６．５ｗｔ％、Ｙ2Ｏ3を３ｗｔ％、ＴｉＯ2を２
３ｗｔ％、Ａｓ2Ｏ3を０．１ｗｔ％の組成比にしてい
る。その結果、屈折率ｎｄ＝１．９２、アッベ数νｄ＝
２８．０、比重ｓｇ＝３．９５の特性が得られた。The optical glass of the tenth embodiment was composed of 2 wt% of SiO 2 , 23 wt% of B 2 O 3 , 10 wt% of CaO,
ZrO 2 11.4 wt%, Nb 2 O 5 1 wt%, La 2
O 3, 26.5wt%, Y 2 O 3 and 3 wt%, the TiO 2 2
The composition ratio of 3 wt% and As 2 O 3 is 0.1 wt%. As a result, the refractive index nd = 1.92 and the Abbe number νd =
The characteristic of 28.0 and specific gravity sg = 3.95 was obtained.
【００３３】上記実施例によると、いづれもＳｉＯ2、
Ｂ2Ｏ3、ＺｒＯ2、Ｌａ2Ｏ3、及びＴｉＯ2を主成分とし
て、これに種々の添加物を添加している。その結果、ｄ
線の屈折率ｎｄを１．８８以上の大きな値にするととも
に、ｄ線のアッベ数νｄを２８以上の低分散にして、比
重ｓｇを４未満の小さい値にすることができた。According to the above-mentioned embodiments, each of them is made of SiO 2 ,
B 2 O 3 , ZrO 2 , La 2 O 3 , and TiO 2 are used as main components, and various additives are added thereto. As a result, d
The refractive index nd of the line was set to a large value of 1.88 or more, the Abbe number νd of the d line was set to a low dispersion of 28 or more, and the specific gravity sg was set to a small value of less than 4.
【００３４】[0034]
【発明の効果】請求項１〜請求項３の発明によると、ｄ
線の屈折率が１．８８以上、ｄ線のアッベ数が２８以
上、及び比重が４未満にできるとともに、溶融性や成形
性を劣化させることなく高い製造歩留まりで安定した光
学ガラスを得ることができる。According to the first to third aspects of the present invention, d
It is possible to obtain a stable optical glass with a high production yield without deteriorating the meltability and moldability, while the refractive index of the line is 1.88 or more, the Abbe number of the d-line is 28 or more, and the specific gravity is less than 4. it can.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4G062 AA04 BB05 DA03 DB01 DB02 DB03 DC04 DE01 DE02 DE03 EA01 EA02 EA03 EB01 EB02 EB03 EC01 EC02 EC03 ED01 ED02 ED03 EE01 EE02 EE03 EE04 EF01 EF02 EF03 EG01 EG02 EG03 FB04 FC04 FD01 FD02 FD03 FG01 FG02 FG03 FG04 FH01 FH02 FH03 FJ01 FJ02 FJ03 FK04 GA10 HH08 JJ04 KK04 MM02 MM03 NN02 NN03 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 4G062 AA04 BB05 DA03 DB01 DB02 DB03 DC04 DE01 DE02 DE03 EA01 EA02 EA03 EB01 EB02 EB03 EC01 EC02 EC03 ED01 ED02 ED03 EE01 EE02 EE03 EE04 EF01 EF02 FD03 FD03 EF03 FD03 FG01 FG02 FG03 FG04 FH01 FH02 FH03 FJ01 FJ02 FJ03 FK04 GA10 HH08 JJ04 KK04 MM02 MM03 NN02 NN03
Claims (3)
種類添加したことを特徴とする請求項１に記載の光学ガ
ラス。 ＣａＯ が２７ｗｔ％以下、 Ｎｂ2Ｏ5が２０ｗｔ％以下。2. An additive having the following composition range is added to at least one
The optical glass according to claim 1, wherein a kind is added. CaO is 27 wt% or less, and Nb 2 O 5 is 20 wt% or less.
種類添加したことを特徴とする請求項１に記載の光学ガ
ラス。 ＣａＯ が２７ｗｔ％以下、 Ｎｂ2Ｏ5が２０ｗｔ％以下、 ＭｇＯ が ８ｗｔ％以下、 ＳｒＯ が ５ｗｔ％以下、 ＢａＯ が ５ｗｔ％以下、 ＺｎＯ が ８ｗｔ％以下、 Ｙ2Ｏ3 が ８ｗｔ％以下、 Ｇｄ2Ｏ3が ５ｗｔ％以下、 Ｔａ2Ｏ5が ５ｗｔ％以下、 ＷＯ3 が ３ｗｔ％以下、 Ａｌ2Ｏ3が ５ｗｔ％以下、 ＧｅＯ2 が ３ｗｔ％以下、 Ｌｉ2Ｏ が ３ｗｔ％以下、 Ｎａ2Ｏ が ２ｗｔ％以下、 Ｋ2Ｏ が ２ｗｔ％以下、 Ｓｂ2Ｏ3が １ｗｔ％以下、 Ａｓ2Ｏ3が １ｗｔ％以下。3. An additive having the following composition range, wherein at least one
The optical glass according to claim 1, wherein a kind is added. CaO is less 27wt%, Nb 2 O 5 is less 20 wt%, MgO is less 8 wt%, SrO is less 5 wt%, BaO is less 5 wt%, ZnO is less 8wt%, Y 2 O 3 is less 8 wt%, Gd 2 O 3 is 5 wt% or less, Ta 2 O 5 is 5 wt% or less, WO 3 is 3 wt% or less, Al 2 O 3 is 5 wt% or less, GeO 2 is 3 wt% or less, Li 2 O is 3 wt% or less, Na 2 O. There follows 2wt%, K 2 O is less 2wt%, Sb 2 O 3 is less 1wt%, As 2 O 3 is less 1 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10330396A JP2000159537A (en) | 1998-11-20 | 1998-11-20 | Optical glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10330396A JP2000159537A (en) | 1998-11-20 | 1998-11-20 | Optical glass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000159537A true JP2000159537A (en) | 2000-06-13 |
Family
ID=18232144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10330396A Pending JP2000159537A (en) | 1998-11-20 | 1998-11-20 | Optical glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000159537A (en) |
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