JP2002362939A - Optical glass - Google Patents
Optical glassInfo
- Publication number
- JP2002362939A JP2002362939A JP2001172052A JP2001172052A JP2002362939A JP 2002362939 A JP2002362939 A JP 2002362939A JP 2001172052 A JP2001172052 A JP 2001172052A JP 2001172052 A JP2001172052 A JP 2001172052A JP 2002362939 A JP2002362939 A JP 2002362939A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- less
- content
- refractive index
- optical glass
- 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
-
- 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
- C03C3/12—Silica-free oxide glass compositions
- C03C3/14—Silica-free oxide glass compositions containing boron
- C03C3/15—Silica-free oxide glass compositions containing boron containing rare earths
- C03C3/155—Silica-free oxide glass compositions containing boron containing rare earths containing zirconium, titanium, tantalum or niobium
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は光学ガラスに関し、
より詳細には眼鏡用ガラスや高屈折率ガラスに使用でき
る光学ガラスに関するものである。TECHNICAL FIELD The present invention relates to an optical glass,
More specifically, the present invention relates to an optical glass that can be used for glasses for glasses or high refractive index glass.
【０００２】[0002]
【従来の技術】高いジオプトリー値を有するレンズにお
いて、レンズの周縁部または中心部の厚みを減少させる
ために高屈折率ガラスが使用されることがあった。しか
し一般に、ガラスの屈折率を高くすると分散および比重
が大きくなる。このため、このような高屈折率ガラスを
眼鏡用ガラスに用いた場合に、眼鏡の重さが着用者の負
担となっていた。また色収差が大きく眼鏡レンズ周縁に
虹が生じて着用者に違和感を与えていた。2. Description of the Related Art In a lens having a high diopter value, a high-refractive-index glass is sometimes used in order to reduce the thickness of the peripheral portion or the central portion of the lens. However, in general, increasing the refractive index of glass increases the dispersion and specific gravity. For this reason, when such high refractive index glass is used for glasses for glasses, the weight of the glasses has become a burden on the wearer. In addition, the chromatic aberration is large, and a rainbow is formed on the periphery of the spectacle lens, giving the wearer an uncomfortable feeling.
【０００３】そこで、高屈折率ガラスにおける比重およ
び分散の増加を抑えるための技術がこれまで種々検討さ
れている。例えば、特開平６−８７６２８号公報や特開
平６−８７６２８号公報、特開２０００−１６９１７６
号公報では、ガラス成分を特定のものとすることによっ
て、屈折率が１．８８〜１．９３、アッベ数が２９．６
〜３２．０、比重が３．９３〜４．１１のガラスを得て
いる。しかし、これら提案されているガラス組成はＬａ
2Ｏ3を多く含むため、眼鏡用ガラスとしては比重がまだ
大きく実使用上充分に満足できるものとはいえなかっ
た。Therefore, various techniques for suppressing an increase in specific gravity and dispersion in high refractive index glass have been studied. For example, JP-A-6-87628, JP-A-6-87628, and JP-A-2000-169176
In Japanese Patent Application Laid-Open Publication No. H10-209, a specific glass component is used to obtain a refractive index of 1.88 to 1.93 and an Abbe number of 29.6.
To 32.0 and a glass having a specific gravity of 3.93 to 4.11. However, these proposed glass compositions are La
Since it contains a large amount of 2 O 3 , the specific gravity of the glass for eyeglasses is still large, and it cannot be said that it is sufficiently satisfactory for practical use.
【０００４】また特開平７−４１３３４号公報や特開２
０００−１２８５７０、特開２０００−１５９５３７号
公報でも、ガラス組成を特定のものとすることによっ
て、屈折率が１．８８５以上、比重が３．９２以下のガ
ラスを得ているが、これら提案されているガラス組成は
ＴｉＯ2を多く含むため、アッベ数が２８．４以下と分
散が大きく眼鏡用ガラスとしては充分に満足できるもの
とはいえなかった。Further, Japanese Patent Application Laid-Open No. 7-41334 and
000-128570 and JP-A-2000-159537 also obtain glasses having a refractive index of 1.885 or more and a specific gravity of 3.92 or less by using a specific glass composition. Since the glass composition contained a large amount of TiO 2 , the Abbe number was 28.4 or less, and the dispersion was large.
【０００５】[0005]
【発明が解決しようとする課題】本発明はこのような従
来の問題に鑑みてなされたものであり、高屈折率であっ
てしかも低分散、低比重の光学ガラスを提供することを
その目的とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and has as its object to provide an optical glass having a high refractive index, a low dispersion and a low specific gravity. Is what you do.
【０００６】また本発明の目的は、眼鏡用ガラスに好適
に用いられる光学ガラスを提供することにある。It is another object of the present invention to provide an optical glass suitably used for glasses for glasses.
【０００７】[0007]
【課題を解決するための手段】前記目的を達成するた
め、本発明の光学ガラスでは、重量％で、Ｂ2Ｏ3：１
２．０〜２８．０％、ＳｉＯ2：０〜１０．０％、ただ
し、Ｂ2Ｏ3＋ＳｉＯ2：１９．０〜２８．０％、Ｃａ
Ｏ：１６．０〜２６．０％（ただし、１６．０％を含ま
ず）、Ｌａ2Ｏ3：７．０〜２０．０％（ただし、２０．
０％を含まず）、Ｎｂ2Ｏ3：２０．０〜３２．０％、Ｔ
ｉＯ2：５．０〜１５．０％、ＺｒＯ2：１．０〜１２．
０％の各ガラス成分を含有する構成とした。なお、以下
「％」は特に断りのない限り「重量％」を意味するもの
とする。In order to achieve the above object, in the optical glass of the present invention, B 2 O 3 : 1 by weight%.
2.0~28.0%, SiO 2: 0~10.0% , however, B 2 O 3 + SiO 2 : 19.0~28.0%, Ca
O: 16.0 to 26.0% (not inclusive of 16.0%), La 2 O 3 : 7.0~20.0% ( provided that 20.
Not including 0%), Nb 2 O 3 : 20.0~32.0%, T
iO 2: 5.0~15.0%, ZrO 2 : 1.0~12.
It was configured to contain 0% of each glass component. Hereinafter, “%” means “% by weight” unless otherwise specified.
【０００８】光学恒数の調整や化学的耐久性の向上など
の観点から、Ｐ2Ｏ5：５．０％以下、Ａｌ2Ｏ3：５．０
％以下、ＧｅＯ2：５．０％以下、Ｓｃ2Ｏ3：５．０％
以下、Ｙ2Ｏ3：８．０％以下、Ｇｄ2Ｏ3：５．０％以
下、Ｔａ2Ｏ5：５．０％以下、ＷＯ3：３．０％以下、
ＭｇＯ：５．０％以下、ＳｒＯ：５．０％以下、Ｂａ
Ｏ：５．０％以下、ＺｎＯ：５．０％以下、Ｌｉ2Ｏ：
２．０％以下、Ｎａ2Ｏ：２．０％以下、Ｋ2Ｏ：２．０
％以下の各ガラス成分をさらに含有するのが好ましい。From the viewpoints of adjusting optical constants and improving chemical durability, P 2 O 5 : 5.0% or less, Al 2 O 3 : 5.0
% Or less, GeO 2 : 5.0% or less, Sc 2 O 3 : 5.0%
Hereinafter, Y 2 O 3 : 8.0% or less, Gd 2 O 3 : 5.0% or less, Ta 2 O 5 : 5.0% or less, WO 3 : 3.0% or less,
MgO: 5.0% or less, SrO: 5.0% or less, Ba
O: 5.0% or less, ZnO: 5.0% or less, Li 2 O:
2.0% or less, Na 2 O: 2.0% or less, K 2 O: 2.0
% Of each glass component.
【０００９】効率的な脱泡を行う観点から、Ｓｂ2Ｏ3及
びＡｓ2Ｏ3の少なくとも一方を、前記ガラス成分の総重
量に対して０．５重量％以下さらに含有するのが望まし
い。From the viewpoint of efficient defoaming, it is desirable that at least one of Sb 2 O 3 and As 2 O 3 is further contained in an amount of 0.5% by weight or less based on the total weight of the glass component.
【００１０】[0010]
【発明の実施の形態】本発明者は、高屈折率を維持しな
がら低分散（高アッベ数（νd））および低比重である
光学ガラスを得られないか鋭意検討を重ねた結果、屈折
率を高くするために従来添加されていたＬａ2Ｏ3の含有
量を減らし、その代わりにＣａＯの含有量を増やせば、
分散および比重の増加を抑えながら屈折率を高くできる
ことを見出し、さらにＴｉＯ2の含有量を減らし、その
代わりにＮｂ2Ｏ3の含有量を増やせば分散を大きくする
ことなく屈折率を高くできることを見出し本発明をなす
に至った。BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have conducted intensive studies as to whether an optical glass having low dispersion (high Abbe number (ν d )) and low specific gravity can be obtained while maintaining a high refractive index. If the content of La 2 O 3 conventionally added to reduce the content was increased and the content of CaO was increased instead,
It has been found that the refractive index can be increased while suppressing the increase in dispersion and specific gravity, and that the refractive index can be increased without increasing the dispersion by further reducing the content of TiO 2 and increasing the content of Nb 2 O 3 instead. The present invention has been accomplished.
【００１１】以下、本発明の光学ガラスの各ガラス成分
を限定した理由について説明する。まず、Ｂ2Ｏ3はガラ
スを形成する必須成分である。含有量が１２．０％未満
であるとガラスが溶融しにくくなり、他方含有量が２
８．０％を超えると粘性が低くなると共に屈折率が小さ
くなる。そこで含有量を１２．０〜２８．０％の範囲と
定めた。より好ましい含有量は１５．０〜２０．０％の
範囲である。Hereinafter, the reasons for limiting the respective glass components of the optical glass of the present invention will be described. First, B 2 O 3 is an essential component for forming glass. If the content is less than 12.0%, the glass becomes difficult to melt, while the content is 2%.
If it exceeds 8.0%, the viscosity decreases and the refractive index decreases. Therefore, the content was determined to be in the range of 12.0 to 28.0%. A more preferred content is in the range of 15.0 to 20.0%.
【００１２】ＳｉＯ2は本発明の光学ガラスにおける必
須の成分ではないが、含有させるとガラスの化学的耐久
性が向上し、成型時に良好な粘性が得られる。しかし１
０．０％を超えて含有させるとガラスの溶融性が悪くな
る。そこで含有量を１０．０％以下と定めた。より好ま
しい上限値は８．０％である。Although SiO 2 is not an essential component in the optical glass of the present invention, when it is contained, the chemical durability of the glass is improved and a good viscosity can be obtained at the time of molding. But one
If the content exceeds 0.0%, the melting property of the glass deteriorates. Therefore, the content was determined to be 10.0% or less. A more preferred upper limit is 8.0%.
【００１３】ただし、Ｂ2Ｏ3とＳｉＯ2との総含有量は
１９．０〜２８．０％の範囲とする必要がある。総含有
量が１９．０％より少ないとガラスが不安定となり、他
方２８．０％よりも多いと高屈折率を得るのが困難とな
るからである。However, the total content of B 2 O 3 and SiO 2 needs to be in the range of 19.0 to 28.0%. If the total content is less than 19.0%, the glass becomes unstable, while if it is more than 28.0%, it becomes difficult to obtain a high refractive index.
【００１４】ＣａＯは分散および比重を大きくせずに屈
折率を高くする作用を奏する。含有量が１６．０％以下
であるとこのような作用が得られない。他方、含有量が
２６．０％を超えるとガラスが失透しやすくなる。そこ
で含有量を１６．０〜２６．０％（ただし、１６．０％
を含まず）の範囲と定めた。より好ましい範囲は１８．
０〜２４．０％の範囲である。CaO has the effect of increasing the refractive index without increasing the dispersion and specific gravity. If the content is 16.0% or less, such an effect cannot be obtained. On the other hand, if the content exceeds 26.0%, the glass tends to be devitrified. Therefore, the content is 16.0 to 26.0% (however, 16.0%
Is not included). A more preferred range is 18.
The range is 0 to 24.0%.
【００１５】Ｌａ2Ｏ3はガラスの屈折率を高くする作用
を奏するが、同時に比重を大きくする作用も奏する。そ
こで前記のようにＣａＯの含有量を増やし、その代わり
にＬａ2Ｏ3の含有量を減らしてその上限を２０．０％未
満とした。一方、屈折率を高くする作用を得るために少
なくとも７．０％以上含有させる必要がある。より好ま
しい含有量は１５．０〜１８．０％の範囲である。La 2 O 3 has the effect of increasing the refractive index of glass, but also has the effect of increasing the specific gravity. Therefore, as described above, the content of CaO was increased, and instead, the content of La 2 O 3 was reduced, and the upper limit was set to less than 20.0%. On the other hand, in order to obtain the effect of increasing the refractive index, it is necessary to contain at least 7.0% or more. A more preferred content is in the range of 15.0 to 18.0%.
【００１６】Ｎｂ2Ｏ3は、ＴｉＯ2ほどは分散を大きく
することなく、屈折率を高くする作用を奏する。含有量
が２０．０％より少ないとこのような作用が得られな
い。他方、含有量が３２．０％を超えるとガラスが失透
しやすくなる。そこで含有量を２０．０〜３２．０％の
範囲と定めた。より好ましい範囲は２１．０〜２５．０
％の範囲である。Nb 2 O 3 has the effect of increasing the refractive index without increasing the dispersion as compared with TiO 2 . If the content is less than 20.0%, such an effect cannot be obtained. On the other hand, if the content exceeds 32.0%, the glass tends to be devitrified. Therefore, the content is set in the range of 20.0 to 32.0%. A more preferred range is 21.0 to 25.0.
% Range.
【００１７】ＴｉＯ2はガラスの比重を大きくすること
なく屈折率を高くする作用を奏するが、同時に分散を急
激に大きくする作用も奏する。そこで、分散を大きくす
ることなく屈折率を高くするためその含有量を１５．０
％以下とした。一方、屈折率を高くする作用を得るため
に含有量を５．０％以上とした。より好ましい含有量は
６．０〜１３．０％の範囲である。While TiO 2 has the effect of increasing the refractive index without increasing the specific gravity of glass, it also has the effect of rapidly increasing the dispersion. Therefore, in order to increase the refractive index without increasing the dispersion, the content is set to 15.0.
% Or less. On the other hand, the content is set to 5.0% or more in order to obtain the effect of increasing the refractive index. A more preferred content is in the range of 6.0 to 13.0%.
【００１８】ＺｒＯ2はガラスの失透を抑える作用を奏
する。含有量が１．０％より少ないとこのような作用が
得られない。他方、含有量が１２．０％を超えるとガラ
スが急激に失透しやすくなる。そこで含有量を１．０〜
１２．０％の範囲と定めた。より好ましい含有量は４．
０〜９．０％の範囲である。ZrO 2 has an effect of suppressing devitrification of glass. If the content is less than 1.0%, such an effect cannot be obtained. On the other hand, if the content exceeds 12.0%, the glass tends to rapidly devitrify. Therefore, the content is 1.0-
The range was determined to be 12.0%. A more preferred content is 4.
The range is 0 to 9.0%.
【００１９】また、本発明の光学ガラスでは、Ｐ2Ｏ5、
Ａｌ2Ｏ3、ＧｅＯ2、Ｓｃ2Ｏ3、Ｙ2Ｏ3、Ｇｄ2Ｏ3、Ｔ
ａ2Ｏ5、ＷＯ3、ＭｇＯ、ＳｒＯ、ＢａＯ、ＺｎＯ、Ｌ
ｉ2Ｏ、Ｎａ2Ｏ、Ｋ2Ｏの各ガラス成分の１種または２
種以上の特定量を必要によりさらに含有させてもよい。
これら成分に限定した理由をそれぞれ以下に説明する。In the optical glass of the present invention, P 2 O 5 ,
Al 2 O 3 , GeO 2 , Sc 2 O 3 , Y 2 O 3 , Gd 2 O 3 , T
a 2 O 5 , WO 3 , MgO, SrO, BaO, ZnO, L
One or two of each glass component of i 2 O, Na 2 O and K 2 O
If necessary, more than one specific amount may be further contained.
The reasons for limiting to these components will be described below.
【００２０】Ｐ2Ｏ5はガラスの失透を防止する作用を奏
するが、含有量が５．０％を超えると屈折率を小さくす
る作用が生じるおそれがある。そこで含有量を５．０％
以下とした。Although P 2 O 5 has an effect of preventing devitrification of glass, if its content exceeds 5.0%, an effect of reducing the refractive index may occur. Therefore, the content is 5.0%
It was as follows.
【００２１】Ａｌ2Ｏ3は化学的耐久性を向上させる作用
を奏するが、含有量が５．０％を超えるとガラスが急激
に失透しやすくなる。そこで含有量を５．０％以下とし
た。Al 2 O 3 has an effect of improving the chemical durability, but if the content exceeds 5.0%, the glass tends to rapidly devitrify. Therefore, the content was set to 5.0% or less.
【００２２】ＧｅＯ2はＳｉＯ2と置換することができ、
また屈折率を高くする作用も奏するが、比重が大きいの
で含有量の上限値を５．０％とした。GeO 2 can be replaced by SiO 2 ,
In addition, it also has the effect of increasing the refractive index, but because of its large specific gravity, the upper limit of the content was set to 5.0%.
【００２３】Ｓｃ2Ｏ3は比重を大きくすることなく屈折
率を高くする作用を奏するが、高価であるためその含有
量を５．０％とした。Although Sc 2 O 3 has the effect of increasing the refractive index without increasing the specific gravity, it is expensive, so its content was made 5.0%.
【００２４】Ｙ2Ｏ3とＧｄ2Ｏ3はガラスの屈折率を調整
する目的で含有させてもよいが、Ｙ 2Ｏ3の含有量が８．
０％を超えると屈折率が低くなり、Ｇｄ2Ｏ3の含有量が
５．０％を超えると分散が大きくなるおそれがある。そ
こでＹ2Ｏ3及びＧｄ2Ｏ3の含有量を８．０％以下および
５．０％以下とした。YTwoOThreeAnd GdTwoOThreeAdjusts the refractive index of glass
May be contained for the purpose of TwoOThreeContent of 8.
If it exceeds 0%, the refractive index decreases, and GdTwoOThreeContent of
If it exceeds 5.0%, the dispersion may increase. So
Here YTwoOThreeAnd GdTwoOThreeLess than 8.0% and
5.0% or less.
【００２５】Ｔａ2Ｏ5はガラスの屈折率を高くする作用
を奏するが、含有量が５％を超えると分散および比重が
大きくなるおそれがある。そこで含有量を５．０％以下
とした。Ta 2 O 5 has the effect of increasing the refractive index of glass, but if the content exceeds 5%, the dispersion and specific gravity may increase. Therefore, the content was set to 5.0% or less.
【００２６】ＷＯ3はガラスの失透を防止する作用を奏
するが、含有量が３．０％を超えるとガラスが着色する
おそれがある。そこで含有量を３．０％以下とした。WO 3 has an effect of preventing devitrification of glass, but if the content exceeds 3.0%, the glass may be colored. Therefore, the content is set to 3.0% or less.
【００２７】ＭｇＯ、ＳｒＯ、ＢａＯ、ＺｎＯの各ガラ
ス成分は、ガラスの屈折率を調整する目的で含有させて
もよいが、これらの各ガラス成分の含有量が５．０％を
超えると、ＭｇＯでは屈折率が低くなり、ＳｒＯ、Ｂａ
Ｏ及びＺｎＯでは比重が大きくなるおそれがある。そこ
でこららの各ガラス成分の含有量を５．０％以下とし
た。Each glass component of MgO, SrO, BaO and ZnO may be contained for the purpose of adjusting the refractive index of the glass. However, if the content of each glass component exceeds 5.0%, MgO , The refractive index becomes low, and SrO, Ba
O and ZnO may have a large specific gravity. Therefore, the content of each of these glass components is set to 5.0% or less.
【００２８】Ｌｉ2Ｏ、Ｎａ2Ｏ、Ｋ2Ｏの各ガラス成分
は、ガラスの溶融性を向上させる作用を奏するが、含有
量が２．０％を超えるとガラスの屈折率が大きく低下す
るおそれがある。そこでこれらの各ガラス成分の含有量
を２．０％以下とした。Each of the glass components Li 2 O, Na 2 O and K 2 O has an effect of improving the melting property of the glass, but if the content exceeds 2.0%, the refractive index of the glass is greatly reduced. There is a risk. Therefore, the content of each of these glass components is set to 2.0% or less.
【００２９】また本発明の光学ガラスでは、効率的な脱
泡を行うために、Ｓｂ2Ｏ3及びＡｓ 2Ｏ3の少なくとも一
方を、前記ガラス成分の総重量に対して０．５重量％以
下さらに含有させてもよい。In the optical glass of the present invention, efficient degassing is performed.
Sb to do the foamTwoOThreeAnd As TwoOThreeAt least one of
Is 0.5% by weight or less based on the total weight of the glass components.
You may make it contain further below.
【００３０】そしてまた、本発明の光学ガラスを例えば
眼鏡ガラスとして用いる場合に、薄ピンク色や薄緑色、
薄青色などに着色するために、ＣｏやＭｎ，Ｐｒ，Ｃ
ｅ，Ｎｄなどの各元素を着色成分として含有させても構
わない。含有量としては一般に数十〜数百ｐｐｍの範囲
である。Further, when the optical glass of the present invention is used as, for example, eyeglasses, a light pink color, a light green color,
Co, Mn, Pr, C
Each element such as e and Nd may be contained as a coloring component. The content is generally in the range of tens to hundreds of ppm.
【００３１】その他必要により、従来公知のガラス成分
及び添加剤を本発明の効果を害しない範囲で添加しても
もちろん構わない。If necessary, a conventionally known glass component and additive may be added as long as the effects of the present invention are not impaired.
【００３２】本発明の光学ガラスの製造方法に特に限定
はなく、これまで公知の製造方法を用いることができ
る。例えば、各成分の原料として各々相当する酸化物、
炭酸塩、硝酸塩、水酸化物などを使用し、所望の割合に
秤量し、粉末で十分に混合して調合原料とする。これを
例えば１，２００〜１，３５０℃に加熱された電気炉中
の白金坩堝などに投入し、溶融清澄後、撹拌均質化して
予め加熱された鋳型に鋳込み、徐冷して製造する。ある
いは、ガラスを滴下させてガラスの表面張力を利用して
製造する方法や連続溶解装置を用いて連続製造する方法
であってもよい。The method for producing the optical glass of the present invention is not particularly limited, and a conventionally known production method can be used. For example, oxides each corresponding as a raw material of each component,
Carbonates, nitrates, hydroxides and the like are used, weighed to a desired ratio, and sufficiently mixed with powder to prepare a prepared raw material. This is put into, for example, a platinum crucible in an electric furnace heated to 1,200 to 1,350 ° C., melt-refined, homogenized by stirring, cast into a pre-heated mold, and gradually cooled to produce. Alternatively, a method of manufacturing by utilizing the surface tension of glass by dropping glass or a method of continuously manufacturing by using a continuous melting apparatus may be used.
【００３３】[0033]
【実施例】以下に本発明を実施例により更に具体的に説
明する。なお、本発明はこれら実施例に限定されるもの
ではない。EXAMPLES The present invention will be described more specifically with reference to the following examples. Note that the present invention is not limited to these examples.
【００３４】実施例１〜１３、比較例１〜８ 酸化物、炭酸塩などの原料を、表１及び表２に示す目標
組成となるように十分に混合して調合原料とした。これ
を１，２００〜１，３５０℃に加熱された電気炉中の白
金坩堝に投入し、溶融清澄後、撹拌均質化して予め加熱
された鉄製又はカーボン製の鋳型に鋳込み、徐冷して各
サンプルを製造した。これらの各サンプルについて次の
試験を行った。結果を合わせて表１及び表２に示す。Examples 1 to 13 and Comparative Examples 1 to 8 Raw materials such as oxides and carbonates were sufficiently mixed so as to have the target compositions shown in Tables 1 and 2 to obtain prepared raw materials. This is put into a platinum crucible in an electric furnace heated to 1,200 to 1,350 ° C., melted and clarified, stirred and homogenized, cast into a pre-heated iron or carbon mold, gradually cooled, and cooled. Samples were manufactured. The following tests were performed on each of these samples. The results are shown in Tables 1 and 2.
【００３５】（屈折率、アッベ数）各サンプルのｄ線に
対する屈折率（ｎd）およびアッベ数（νd）を測定し
た。これらの測定は日本光学硝子工業会規格（ＪＯＧＩ
Ｓ）の試験方法に準じて行った。(Refractive Index, Abbe Number) The refractive index (n d ) and Abbe number (ν d ) of each sample with respect to d-line were measured. These measurements are based on the Japan Optical Glass Industry Association Standard (JOGI
It carried out according to the test method of S).
【００３６】（比重）エタノールを浸液とするアルキメ
デス法により測定した。(Specific gravity) It was measured by the Archimedes method using ethanol as an immersion liquid.
【００３７】[0037]
【表１】 [Table 1]
【００３８】[0038]
【表２】 [Table 2]
【００３９】表１によれば、実施例１〜１３の光学ガラ
スは、屈折率（ｎd）が１．８８５以上と高屈折率であ
って、同時にアッベ数（νd）は２８．６以上、比重は
３．９１以下と低分散および低比重であった。[0039] According to Table 1, the optical glasses of Examples 1-13, a refractive index (n d) of 1.885 or more and a high refractive index, at the same time an Abbe number ([nu d) 28.6 or more , The specific gravity was 3.91 or less, low dispersion and low specific gravity.
【００４０】一方、表２によれば、比較例１の光学ガラ
スでは、Ｌａ2Ｏ3を２２．０％と多くしてＣａＯを７．
０％と少なくし、またＮｂ2Ｏ3を１９．０％と少なくし
たため、ガラスの屈折率が１．８８３と低く、比重も
４．０２と大きかった。また本発明の規定量よりもＣａ
Ｏを少なくしてＬａ2Ｏ3を多くした比較例２および比較
例３の光学ガラスでは、比重が４．００及び３．９５と
いずれも大きかった。[0040] In contrast, according to Table 2, the optical glass of Comparative Example 1, the CaO by increasing the La 2 O 3 22.0% 7.
Since it was reduced to 0% and Nb 2 O 3 was reduced to 19.0%, the refractive index of the glass was as low as 1.883 and the specific gravity was as large as 4.02. In addition, Ca is larger than the specified amount of the present invention.
In the optical glasses of Comparative Examples 2 and 3 in which O was reduced and La 2 O 3 was increased, the specific gravities were 4.00 and 3.95, both of which were large.
【００４１】（Ｂ2Ｏ3＋ＳｉＯ2）、ＣａＯ、Ｌａ
2Ｏ3、Ｎｂ2Ｏ3、ＴｉＯ2、ＺｒＯ2の各ガラス成分の含
有量が本発明の規定から外れた比較例４の光学ガラスで
は、アッベ数が２７．４と小さい、すなわち分散が大き
かった。同様に、ＣａＯ、Ｌａ2Ｏ3、Ｎｂ2Ｏ3、ＴｉＯ
2の含有量が本発明の規定から外れた比較例５の光学ガ
ラス、および（Ｂ2Ｏ3＋ＳｉＯ2）、ＣａＯ、Ｌａ
2Ｏ3、Ｎｂ2Ｏ3、ＴｉＯ2の各ガラス成分の含有量が本
発明の規定から外れた比較例６の光学ガラスでも、アッ
ベ数が２７．２および２８．４と小さい、すなわち分散
が大きかった。(B 2 O 3 + SiO 2 ), CaO, La
In the optical glass of Comparative Example 4 in which the content of each glass component of 2 O 3 , Nb 2 O 3 , TiO 2 , and ZrO 2 was out of the range of the present invention, the Abbe number was as small as 27.4, that is, the dispersion was large. Was. Similarly, CaO, La 2 O 3 , Nb 2 O 3 , TiO
The optical glass of Comparative Example 5 in which the content of 2 deviated from the definition of the present invention, and (B 2 O 3 + SiO 2 ), CaO, La
Even the optical glass of Comparative Example 6 in which the content of each glass component of 2 O 3 , Nb 2 O 3 , and TiO 2 is out of the range of the present invention, the Abbe number is as small as 27.2 and 28.4, that is, the dispersion is small. It was big.
【００４２】Ｎｂ2Ｏ3、ＴｉＯ2、ＺｒＯ2の各ガラス成
分の含有量が本発明の規定から外れた比較例７の光学ガ
ラス、およびＺｒＯ2の含有量が１２．９％と多い比較
例８の光学ガラスでは、いずれも溶融時に失透してしま
った。The optical glass of Comparative Example 7 in which the content of each glass component of Nb 2 O 3 , TiO 2 , and ZrO 2 is outside the range of the present invention, and the comparative example in which the content of ZrO 2 is as large as 12.9% In the optical glass of No. 8, all devitrified at the time of melting.
【００４３】[0043]
【発明の効果】本発明の光学ガラスでは、Ｂ2Ｏ3、Ｓｉ
Ｏ2、Ｂ2Ｏ3＋ＳｉＯ2、ＣａＯ、Ｌａ 2Ｏ3、Ｎｂ2Ｏ3、
ＴｉＯ2、ＺｒＯ2の各ガラス成分を特定量含有させたの
で、高屈折率（ｎdが１．８８５以上）であって、しか
も低分散（νdが２８．６以上）、低比重（３．９１以
下）が得られた。According to the optical glass of the present invention, BTwoOThree, Si
OTwo, BTwoOThree+ SiOTwo, CaO, La TwoOThree, NbTwoOThree,
TiOTwo, ZrOTwoThe specific amount of each glass component was included
And a high refractive index (ndIs 1.885 or more)
Also low dispersion (νdIs 28.6 or more), low specific gravity (3.91 or more)
Below) was obtained.
【００４４】本発明の光学ガラスを眼鏡用ガラスに用い
ると、高いジオプトリー値を有するレンズの周縁部また
は中心部の厚みを減少させることができる。また従来の
レンズより比重が小さいので眼鏡の重さに対する着用者
の負担を軽減できる。さらに従来のレンズより分散が小
さいので色収差が小さく、眼鏡レンズ周縁に虹が生じる
ことがなく着用者に違和感を与えることがない。When the optical glass of the present invention is used for glasses for glasses, the thickness of the peripheral portion or the center portion of a lens having a high diopter value can be reduced. In addition, since the specific gravity is smaller than that of the conventional lens, the burden on the wearer of the weight of the glasses can be reduced. Further, since the dispersion is smaller than that of the conventional lens, the chromatic aberration is small, and no rainbow is formed on the periphery of the spectacle lens, so that the wearer does not feel uncomfortable.
フロントページの続き Ｆターム(参考） 4G062 AA04 BB01 BB07 DA01 DA02 DA03 DB01 DB02 DB03 DC04 DD01 DD02 DD03 DE01 DE02 DE03 DF01 EA01 EA02 EA03 EB01 EB02 EB03 EC01 EC02 EC03 ED01 ED02 ED03 EE04 EF01 EF02 EF03 EG01 EG02 EG03 FA01 FB03 FB04 FC03 FC04 FD01 FD02 FD03 FE01 FF01 FG04 FG05 FH01 FH02 FH03 FJ01 FJ02 FJ03 FK03 FK04 FL01 FL02 GA01 GA10 GB01 GC01 GD01 GE01 HH01 HH03 HH05 HH07 HH08 HH09 HH11 HH12 HH13 HH15 HH17 HH18 HH20 JJ01 JJ03 JJ05 JJ07 JJ10 KK01 KK02 KK03 KK04 KK05 KK07 KK10 MM02 MM03 NN02 NN03 NN33 Continued on the front page F term (reference) 4G062 AA04 BB01 BB07 DA01 DA02 DA03 DB01 DB02 DB03 DC04 DD01 DD02 DD03 DE01 DE02 DE03 DF01 EA01 EA02 EA03 EB01 EB02 EB03 EC01 EC02 EC03 ED01 ED02 ED03 EE04 EF01 EF01 EF01 EF03 EF01 EF02 EF03 FC04 FD01 FD02 FD03 FE01 FF01 FG04 FG05 FH01 FH02 FH03 FJ01 FJ02 FJ03 FK03 FK04 FL01 FL02 GA01 GA10 GB01 GC01 GD01 GE01 HH01 HH03 HH05 HH07 HH08 HH09 KK07HH11 KK MM03 NN02 NN03 NN33
Claims (3)
％、ＳｉＯ2：０〜１０．０％、ただし、Ｂ2Ｏ3＋Ｓｉ
Ｏ2：１９．０〜２８．０％、ＣａＯ：１６．０〜２
６．０％（ただし、１６．０％を含まず）、Ｌａ2Ｏ3：
７．０〜２０．０％（ただし、２０．０％を含まず）、
Ｎｂ2Ｏ3：２０．０〜３２．０％、ＴｉＯ2：５．０〜
１５．０％、ＺｒＯ2：１．０〜１２．０％の各ガラス
成分を含有することを特徴とする光学ガラス。1. B 2 O 3 : 12.0 to 28.0% by weight
%, SiO 2 : 0 to 10.0%, provided that B 2 O 3 + Si
O 2 : 19.0 to 28.0%, CaO: 16.0 to 2
6.0% (but not including 16.0%), La 2 O 3 :
7.0 to 20.0% (but not including 20.0%),
Nb 2 O 3: 20.0~32.0%, TiO 2: 5.0~
15.0%, ZrO 2: 1.0~12.0% of optical glass characterized by containing the respective glass component.
2Ｏ3：５．０％以下、ＧｅＯ2：５．０％以下、Ｓｃ2Ｏ
3：５．０％以下、Ｙ2Ｏ3：８．０％以下、Ｇｄ2Ｏ3：
５．０％以下、Ｔａ2Ｏ5：５．０％以下、ＷＯ3：３．
０％以下、ＭｇＯ：５．０％以下、ＳｒＯ：５．０％以
下、ＢａＯ：５．０％以下、ＺｎＯ：５．０％以下、Ｌ
ｉ2Ｏ：２．０％以下、Ｎａ2Ｏ：２．０％以下、Ｋ
2Ｏ：２．０％以下の各ガラス成分をさらに含有する請
求項１記載の光学ガラス。2. P 2 O 5 : not more than 5.0% by weight, Al
2 O 3 : 5.0% or less, GeO 2 : 5.0% or less, Sc 2 O
3: 5.0% or less, Y 2 O 3: 8.0% or less, Gd 2 O 3:
5.0% or less, Ta 2 O 5: 5.0% or less, WO 3: 3.
0% or less, MgO: 5.0% or less, SrO: 5.0% or less, BaO: 5.0% or less, ZnO: 5.0% or less, L
i 2 O: 2.0% or less, Na 2 O: 2.0% or less, K
The optical glass according to claim 1, further comprising 2 % or less of each glass component of 2.0% or less.
を、前記ガラス成分の総重量に対して０．５重量％以下
さらに含有する請求項１又は２記載の光学ガラス。3. The optical glass according to claim 1, further comprising 0.5% by weight or less of at least one of Sb 2 O 3 and As 2 O 3 based on the total weight of the glass component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001172052A JP2002362939A (en) | 2001-06-07 | 2001-06-07 | Optical glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001172052A JP2002362939A (en) | 2001-06-07 | 2001-06-07 | Optical glass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002362939A true JP2002362939A (en) | 2002-12-18 |
Family
ID=19013734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001172052A Pending JP2002362939A (en) | 2001-06-07 | 2001-06-07 | Optical glass |
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| Country | Link |
|---|---|
| JP (1) | JP2002362939A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006089369A (en) * | 2004-08-27 | 2006-04-06 | Ohara Inc | Optical glass |
| US8187986B2 (en) | 2006-10-24 | 2012-05-29 | Ohara Inc. | Optical glass |
| US8207075B2 (en) | 2008-01-31 | 2012-06-26 | Ohara Inc. | Optical glass |
| JP2012229135A (en) * | 2011-04-25 | 2012-11-22 | Hoya Corp | Optical glass, glass material for press molding, optical element and method for producing the same, and joined optical element |
| WO2014057584A1 (en) * | 2012-10-12 | 2014-04-17 | Hoya株式会社 | Optical glass, glass material for press-molding, optical element and method for manufacturing same, and bonding optical element |
| US8852745B2 (en) | 2012-10-12 | 2014-10-07 | Hoya Corporation | Optical glass, press-molding glass material, optical element and method of manufacturing the same, and bonded optical element |
| JP2014214082A (en) * | 2013-04-30 | 2014-11-17 | 株式会社オハラ | Optical glass, preform and optical element |
| WO2022055688A2 (en) | 2020-09-10 | 2022-03-17 | Corning Incorporated | Silicoborate and borosilicate glasses having high refractive index and low density |
| US11802073B2 (en) | 2020-09-10 | 2023-10-31 | Corning Incorporated | Silicoborate and borosilicate glasses with high refractive index and low density |
| US11976004B2 (en) | 2020-09-10 | 2024-05-07 | Corning Incorporated | Silicoborate and borosilicate glasses having high refractive index and high transmittance to blue light |
-
2001
- 2001-06-07 JP JP2001172052A patent/JP2002362939A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006089369A (en) * | 2004-08-27 | 2006-04-06 | Ohara Inc | Optical glass |
| US8187986B2 (en) | 2006-10-24 | 2012-05-29 | Ohara Inc. | Optical glass |
| US8563451B2 (en) | 2006-10-24 | 2013-10-22 | Ohara Inc. | Optical glass |
| US8207075B2 (en) | 2008-01-31 | 2012-06-26 | Ohara Inc. | Optical glass |
| JP2012229135A (en) * | 2011-04-25 | 2012-11-22 | Hoya Corp | Optical glass, glass material for press molding, optical element and method for producing the same, and joined optical element |
| US8852745B2 (en) | 2012-10-12 | 2014-10-07 | Hoya Corporation | Optical glass, press-molding glass material, optical element and method of manufacturing the same, and bonded optical element |
| WO2014057584A1 (en) * | 2012-10-12 | 2014-04-17 | Hoya株式会社 | Optical glass, glass material for press-molding, optical element and method for manufacturing same, and bonding optical element |
| CN104703935A (en) * | 2012-10-12 | 2015-06-10 | Hoya株式会社 | Optical glass, glass material for press-molding, optical element and method for manufacturing same, and bonding optical element |
| CN104703935B (en) * | 2012-10-12 | 2018-01-19 | Hoya株式会社 | Optical glass, compressing use glass material, optical element and its manufacture method and engagement optical element |
| JP2014214082A (en) * | 2013-04-30 | 2014-11-17 | 株式会社オハラ | Optical glass, preform and optical element |
| WO2022055688A2 (en) | 2020-09-10 | 2022-03-17 | Corning Incorporated | Silicoborate and borosilicate glasses having high refractive index and low density |
| US11802073B2 (en) | 2020-09-10 | 2023-10-31 | Corning Incorporated | Silicoborate and borosilicate glasses with high refractive index and low density |
| US11976004B2 (en) | 2020-09-10 | 2024-05-07 | Corning Incorporated | Silicoborate and borosilicate glasses having high refractive index and high transmittance to blue light |
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