JPH0656462A - Glasses and optical lightweight glass - Google Patents
Glasses and optical lightweight glassInfo
- Publication number
- JPH0656462A JPH0656462A JP5182095A JP18209593A JPH0656462A JP H0656462 A JPH0656462 A JP H0656462A JP 5182095 A JP5182095 A JP 5182095A JP 18209593 A JP18209593 A JP 18209593A JP H0656462 A JPH0656462 A JP H0656462A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- glass
- geo
- density
- pbo
- 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.)
- Granted
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
- C03C3/12—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
-
- 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]
【産業上の利用分野】本発明は、高屈折性でしかも軽量
な眼鏡及び光学ガラスに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to eyeglasses and optical glasses which are highly refractive and lightweight.
【０００２】[0002]
【従来の技術】眼鏡ガラス、特に高いジオプトリーを有
する眼鏡ガラスについて、眼鏡装着者にとってガラスの
重量従ってまた眼鏡の重量が軽減されるように、高屈折
率を有するガラスが開発されている。さらにまたできる
だけ低い比重を有する高屈折性ガラスを製造することも
試みられている。極めて高い屈折率を有するガラスが米
国特許第４，１２０，７３２号明細書により知られてい
る。しかし、このガラスの欠点は、高い屈折率は専ら比
較的多量のＷＯ3 の添加によって得られるので、ガラス
の密度が不都合に高くならざるを得ないことである。米
国特許第４，１２８，４３２号明細書には良好な屈折率
を有する光学ガラスが記載されているが、この屈折率は
ＰｂＯ成分によって生起されるから、このガラスも軽量
ガラスと呼ぶことはできない。米国特許第４，７３２，
８７６号明細書には上述のような軽量ガラスについて記
載されているが、このガラスの場合は屈折率が十分でな
い。最後に、更にドイツ特許第３２０１３４６号明細書
には二重焦点眼鏡の近焦点部レンズに適した光学ガラス
が記載されている。このガラスも屈折率が必ずしも十分
でない。2. Description of the Related Art For spectacle glasses, especially spectacle glasses having a high diopter, glasses having a high refractive index have been developed so that the weight of the glasses and thus the weight of the glasses is reduced for the spectacle wearer. It has also been attempted to produce highly refractive glasses with the lowest possible specific gravity. Glasses with a very high refractive index are known from US Pat. No. 4,120,732. However, the disadvantage of this glass is that the high refractive index is obtained exclusively by the addition of relatively large amounts of WO 3 , so that the density of the glass has to be disadvantageously high. U.S. Pat. No. 4,128,432 describes an optical glass having a good refractive index, but since this refractive index is caused by the PbO component, this glass cannot be called a lightweight glass either. . U.S. Pat. No. 4,732,
Although the specification of 876 describes a lightweight glass as described above, the refractive index of this glass is not sufficient. Finally, German Patent No. 3,201,346 also describes an optical glass suitable for the near-focus lens of bifocal spectacles. This glass also does not necessarily have a sufficient refractive index.
【０００３】[0003]
【発明が解決しようとする課題】従って、本発明の目的
は、密度が好ましくは４．２ｇ／ｃｍ3 以下であり、少
なくとも１．８５の高い屈折率を有するガラスを見出す
ことにある。しかも、ガラスは優れた結晶化安定性を有
し、良好な耐薬品性を持つものでなければならない。SUMMARY OF THE INVENTION It is therefore an object of the present invention to find a glass whose density is preferably below 4.2 g / cm 3 and which has a high refractive index of at least 1.85. Moreover, the glass must have excellent crystallization stability and good chemical resistance.
【０００４】[0004]
【課題を解決するための手段】前記目的を達成するため
に、本発明の第一の側面によれば、酸化物基準で下記の
組成 ＳｉＯ2 ０〜１２重量％ ＧｅＯ2 ０〜３ 重量％ ΣＳｉＯ2 ＋ＧｅＯ2 ０〜１２重量％ Ｂ2 Ｏ3 １４〜３０重量％ Ｐ2 Ｏ5 ０〜２ 重量％ Ｌｉ2 Ｏ ０〜２ 重量％ Ｎａ2 Ｏ ０〜２ 重量％ Ｋ2 Ｏ ０〜２ 重量％ Ｃｓ2 Ｏ ０〜２ 重量％ Σアルカリ酸化物 ０〜２ 重量％ ＣａＯ １１〜２２重量％ ΣＭｇＯ＋ＳｒＯ＋ＢａＯ＋ＺｎＯ＋ＰｂＯ ０〜２ 重量％ Ａｌ2 Ｏ3 ０〜２ 重量％ Ｌａ2 Ｏ3 ２０〜３１重量％ Ｙ2 Ｏ3 ０〜５ 重量％ ΣＢｉ2 Ｏ3 ＋Ｇｄ2 Ｏ3 ０〜２ 重量％ ΣＬａ2 Ｏ3 ＋Ｙ2 Ｏ3 ＜３１ 重量％ ＴｉＯ2 ６〜１４重量％ ＺｒＯ2 ２〜＜８重量％ Ｔａ2 Ｏ5 ０〜５ 重量％ Ｎｂ2 Ｏ5 ＞２０〜３０重量％ ＷＯ3 ０〜２ 重量％ Ｆ ０〜２ 重量％ ＳＯ3 ０〜２ 重量％ を有し、必要に応じて慣用の量の清澄剤を含有すること
を特徴とする眼鏡及び光学ガラス（以下、第一のガラス
ということもある）が提供される。上記の組成範囲のガ
ラスとすることにより、密度が約４．２ｇ／ｃｍ3 以
下、好ましくは４．０ｇ／ｃｍ3 以下であり、少なくと
も１．８５、好ましくは１．８８より大きい屈折率ｎ
ｄ、及び３０以上のアッベ数νｄを有するガラスが提供
される。Means for Solving the Problems] To achieve the above object, according to a first aspect of the present invention, the oxide composition SiO 2 0 to 12% by weight below the reference GeO 2 0 to 3 wt% ShigumaSiO 2 + GeO 2 0 to 12 wt% B 2 O 3 14 to 30 wt% P 2 O 5 0 to 2 wt% Li 2 O 0 to 2 wt% Na 2 O 0 to 2 wt% K 2 O 0 to 2 wt% Cs 2 O 0 to 2% by weight Σ Alkali oxide 0 to 2% by weight CaO 11 to 22% by weight ΣMgO + SrO + BaO + ZnO + PbO 0 to 2% by weight Al 2 O 3 0 to 2% by weight La 2 O 3 20 to 31% by weight Y 2 O 30 to 5% by weight ΣBi 2 O 3 + Gd 2 O 3 0 to 2% by weight ΣLa 2 O 3 + Y 2 O 3 <31% by weight TiO 2 6 to 14% by weight ZrO 2 2 to <8% by weight Ta 2 O 5 0-5 wt% Nb 2 O 5 > 20-30 wt% WO 3 Have 0-2 wt% F 0-2% by weight SO 3 0-2 wt%, of customary amounts as needed eyeglasses and optical glass characterized by containing a refining agent (hereinafter, the first Sometimes called glass) is provided. The glass having the above composition range has a density of about 4.2 g / cm 3 or less, preferably 4.0 g / cm 3 or less, and a refractive index n of at least 1.85, preferably greater than 1.88.
d and a glass having an Abbe number νd of 30 or more are provided.
【０００５】本発明の第二の側面によれば、下記の組成 ＳｉＯ2 ０〜１０重量％ ＧｅＯ2 ０〜２ 重量％ ΣＳｉＯ2 ＋ＧｅＯ2 ０〜１０重量％ Ｂ2 Ｏ3 １３〜２３重量％ Ｐ2 Ｏ5 ０〜２ 重量％ Ｌｉ2 Ｏ ０〜２ 重量％ Ｎａ2 Ｏ ０〜２ 重量％ Ｋ2 Ｏ ０〜２ 重量％ Ｃｓ2 Ｏ ０〜２ 重量％ Σアルカリ酸化物 ０〜２ 重量％ ＣａＯ １０〜２０重量％ ΣＭｇＯ＋ＳｒＯ＋ＢａＯ＋ＺｎＯ＋ＰｂＯ ０〜２ 重量％ Ａｌ2 Ｏ3 ０〜２ 重量％ Ｌａ2 Ｏ3 ＞２８〜３３重量％ Ｙ2 Ｏ3 ０〜５ 重量％ ΣＢｉ2 Ｏ3 ＋Ｇｄ2 Ｏ3 ０〜２ 重量％ ΣＬａ2 Ｏ3 ＋Ｙ2 Ｏ3 ＞２８〜３３重量％ ＴｉＯ2 ７〜１２重量％ ＺｒＯ2 ４〜＜８重量％ Ｔａ2 Ｏ5 ０〜５ 重量％ Ｎｂ2 Ｏ5 １３〜２１重量％ ＷＯ3 ０〜２ 重量％ Ｆ ０〜１ 重量％ ＳＯ3 ０〜１ 重量％ を有し、必要に応じて慣用の量の清澄剤を含有すること
を特徴とする眼鏡及び光学ガラス（以下、第二のガラス
ということもある）が提供される。上記の組成範囲のガ
ラスとすることにより、１．８８より大きい屈折率ｎ
ｄ、３１より大きいアッベ数νｄ及び４．１５ｇ／ｃｍ
3 以下の密度を有するガラスが提供される。上記組成範
囲の本発明の第二のガラスは、第一のガラスに比べて比
重が僅かに高いが、とりわけ酸化ランタン含量がやや高
く、酸化ニオブ含量がやや低いことが前記第一のガラス
と異なり、このため安価に製造することができる。According to the second aspect of the present invention, the following composition SiO 2 0 to 10% by weight GeO 2 0 to 2% by weight ΣSiO 2 + GeO 2 0 to 10% by weight B 2 O 3 13 to 23% by weight P 2 O 5 0-2% by weight Li 2 O 0-2% by weight Na 2 O 0-2% by weight K 2 O 0-2% by weight Cs 2 O 0-2% by weight Σ Alkali oxide 0-2% by weight CaO 10 to 20% by weight ΣMgO + SrO + BaO + ZnO + PbO 0 to 2% by weight Al 2 O 3 0 to 2% by weight La 2 O 3 > 28 to 33% by weight Y 2 O 3 0 to 5% by weight ΣBi 2 O 3 + Gd 2 O 3 0 to 2 wt% ΣLa 2 O 3 + Y 2 O 3> 28~33 wt% TiO 2 7 to 12 wt% ZrO 2 4~ <8 wt% Ta 2 O 5 0~5 wt% Nb 2 O 5 13~21 wt% WO 3 0-2 wt% F 0 to 1 wt% SO 3 0 to 1 wt% And spectacles and optical glass (hereinafter sometimes referred to as a second glass), characterized by containing a conventional amount of a fining agent as required. When the glass having the above composition range is used, the refractive index n is larger than 1.88.
d, Abbe number νd greater than 31 and 4.15 g / cm
A glass having a density of 3 or less is provided. The second glass of the present invention having the above composition range has a slightly higher specific gravity than the first glass, but in particular, the lanthanum oxide content is slightly higher, and the niobium oxide content is slightly lower than the first glass. Therefore, it can be manufactured at low cost.
【０００６】[0006]
【発明の作用及び態様】本発明のガラス系は、基本的に
は成分Ｂ2 Ｏ3 、Ｌａ2 Ｏ3 及びＣａＯで構成される。
所期の屈折率を得るために成分ＴｉＯ2 、Ｎｂ2 Ｏ5 及
びＺｒＯ2 を添加する。また、耐薬品性を高め、結晶化
特性を改善するために、ガラスにさらにＳｉＯ2 及びＧ
ｅＯ2 を添加することができる。Ｂ2 Ｏ3 含量の限界
は、十分な耐薬品性の要求と網目形成成分としての機能
で決まる。Ｂ2 Ｏ3 含量が３０重量％を超えると、上記
の必要条件の第１の要求を満たすのが極めて困難にな
る。一方、Ｂ2 Ｏ3 含量が１３重量％未満に低下する
と、ガラスの安定性が損なわれる。従って好適には、Ｂ
2 Ｏ3 含量の下限は１４重量％未満に低下させないこと
が好ましい。Ｂ2 Ｏ3 含量の好適な範囲は、非常に低い
密度のガラス（第一のガラス）については１５〜１９重
量％であり、やや高い密度のガラス（第二のガラス）で
は１３〜２３重量％である。The glass system of the present invention is basically composed of the components B 2 O 3 , La 2 O 3 and CaO.
The components TiO 2 , Nb 2 O 5 and ZrO 2 are added to obtain the desired refractive index. Further, in order to enhance chemical resistance and improve crystallization characteristics, glass is further supplemented with SiO 2 and G.
eO 2 can be added. The B 2 O 3 content limit is determined by the requirement for sufficient chemical resistance and the function as a network forming component. If the B 2 O 3 content exceeds 30% by weight, it becomes extremely difficult to meet the first requirement of the above requirements. On the other hand, if the B 2 O 3 content falls below 13% by weight, the stability of the glass is impaired. Therefore, preferably, B
The lower limit of 2 O 3 content is preferably not reduced below 14% by weight. The preferred range of B 2 O 3 content is 15 to 19 wt% for very low density glass (first glass) and 13 to 23 wt% for slightly higher density glass (second glass). Is.
【０００７】ガラスの安定性を高めるために、更に網目
形成成分ＳｉＯ2 及びＧｅＯ2 を合計１２重量％以下の
量で添加することができる。但し、ＧｅＯ2 含量は３重
量％を超えないものとする。低密度のガラス（第一のガ
ラス）には５〜９重量％のＳｉＯ2 含量が好ましい。そ
の場合、ＧｅＯ2 の含有を差控える。ガラスの比重が僅
かに高いことが許される場合（第二のガラス）には、０
〜１０重量％のＳｉＯ2 ＋ＧｅＯ2 総含量が好ましい。
但し、その場合、この合計量の内のＧｅＯ2 含量は２重
量％を超えてはならない。この場合も、ガラスはＧｅＯ
2 を含まないことが好ましい。ガラスの安定性を改善す
るためにさらに少量のＰ2 Ｏ5 をガラスに加えることが
できる。但し、Ｐ2 Ｏ5 は屈折率を引き下げる作用があ
るので、２重量％のＰ2 Ｏ5 含量を超えてはならない。
この場合も、ガラスはＰ2 Ｏ5 を含まないことが好まし
い。In order to improve the stability of the glass, the network-forming components SiO 2 and GeO 2 can be added in a total amount of 12% by weight or less. However, the GeO 2 content shall not exceed 3% by weight. A SiO 2 content of 5-9% by weight is preferred for low-density glass (first glass). In that case, refrain from containing GeO 2 . 0 if the specific gravity of the glass is allowed to be slightly higher (second glass)
A total SiO 2 + GeO 2 content of -10% by weight is preferred.
However, in this case, the GeO 2 content in this total amount should not exceed 2% by weight. Again, the glass is GeO
It is preferable not to include 2 . Smaller amounts of P 2 O 5 can be added to the glass to improve the stability of the glass. However, since P 2 O 5 has a function of lowering the refractive index, the P 2 O 5 content of 2 % by weight should not be exceeded.
Also in this case, it is preferable that the glass does not contain P 2 O 5 .
【０００８】アルカリ酸化物はガラスの溶融を容易にす
るので、ガラスに添加することができる。但し、屈折率
を引き下げる作用が強い。この理由から、アルカリ酸化
物の総含量（総和Ｍ2 Ｏ）は２重量％を超えてはならな
い。その際、酸化リチウム含量は０．５重量％以下であ
ることが好ましく、一方、ナトリウム、カリウム及びセ
シウムの酸化物は最大量がそれぞれ２重量％であってよ
い。但し、アルカリ酸化物含量（総和Ｍ2 Ｏ）を合計で
最大１重量％に制限することが好ましい。特に好ましい
のはアルカリ酸化物を含まないガラスである。Alkali oxides facilitate the melting of the glass and can therefore be added to the glass. However, it has a strong effect of lowering the refractive index. For this reason, the total content of alkali oxides (total M 2 O) should not exceed 2% by weight. The lithium oxide content is then preferably 0.5% by weight or less, while the maximum amounts of oxides of sodium, potassium and cesium may each be 2% by weight. However, it is preferable to limit the total content of alkali oxides (total M 2 O) to a maximum of 1% by weight. Particularly preferred is glass that does not contain alkali oxides.
【０００９】成分Ｌａ2 Ｏ3 は要求される光学値の達成
に寄与する。Ｌａ2 Ｏ3 含量の範囲は、低密度ガラス
（第一のガラス）については２０〜３１重量％、好まし
くは２３〜２７重量％の量である。ガラスの密度の僅か
な増加が許容される場合には、Ｌａ2 Ｏ3 含量は２３重
量％超過、最大３３重量％までである。ガラス密度を低
減するためにＬａ2 Ｏ3 をＹ2 Ｏ3 で置換することがで
きるが、Ｙ2 Ｏ3 含量の増加につれてガラス価格が比較
にならない程急騰するので、この置換には限界がある。
この理由から、Ｙ2 Ｏ3 含量は最大５重量％とし、３重
量％以下であることが好ましい。但し、特に低い密度の
ガラスを希望する場合は、ランタン及びイットリウムの
酸化物の含量が合計３１重量％、特に２７重量％を超え
てはならない。僅かな密度増加が許容される場合（第二
のガラス）においては、Ｌａ2 Ｏ3＋Ｙ2 Ｏ3 含量を２
８重量％超過、最大３３重量％以下とする。限られた範
囲内でＬａ2 Ｏ3 とＹ2 Ｏ3 をＢｉ2 Ｏ3 又はＧｄ2 Ｏ
3 で置換することができるが、この２つの物質はガラス
密度を不都合に高めるので、Ｂｉ2 Ｏ3 ＋Ｇｄ2 Ｏ3含
量の上限は合計２重量％を超えてはならない。好適に
は、ガラスはＢｉ2 Ｏ3もＧｄ2 Ｏ3 も含まないことが
好ましい。また、化学的性質の改善のために、ガラスに
さらにＡｌ2 Ｏ3 を添加することができる。しかし、Ａ
ｌ2 Ｏ3 含量の増加と共にガラスの失透安定性が低下す
るので、Ａｌ2 Ｏ3 含量の上限２重量％を超えてはなら
ない。好適には、０．２重量％のＡｌ2 Ｏ3 含量が好ま
しい。The component La 2 O 3 contributes to the achievement of the required optical values. The range of La 2 O 3 content is 20 to 31% by weight, preferably 23 to 27% by weight for low density glass (first glass). If a slight increase in the density of the glass is tolerated, the La 2 O 3 content exceeds 23% by weight, up to 33% by weight. La 2 O 3 can be replaced by Y 2 O 3 to reduce the glass density, but this replacement is limited because the glass price rises incomparably with increasing Y 2 O 3 content. .
For this reason, the Y 2 O 3 content is set to a maximum of 5% by weight and is preferably 3% by weight or less. However, if a glass of particularly low density is desired, the total content of lanthanum and yttrium oxides must not exceed 31% by weight, in particular 27% by weight. If a slight increase in density is allowed (second glass), the La 2 O 3 + Y 2 O 3 content should be 2
Exceeding 8% by weight and maximally 33% by weight or less. La 2 O 3 and Y 2 O 3 were mixed with Bi 2 O 3 or Gd 2 O within a limited range.
Although it can be replaced by 3 , the upper limit of the Bi 2 O 3 + Gd 2 O 3 content must not exceed a total of 2% by weight, since these two substances disadvantageously increase the glass density. Suitably, the glass preferably contains neither Bi 2 O 3 nor Gd 2 O 3 . Further, Al 2 O 3 can be further added to the glass in order to improve the chemical properties. However, A
The upper limit of 2% by weight of Al 2 O 3 should not be exceeded, as the devitrification stability of the glass decreases with increasing l 2 O 3 content. An Al 2 O 3 content of 0.2% by weight is preferred.
【００１０】所望の高い屈折率を得るために、ガラスは
６〜１４重量％の量の成分ＴｉＯ2を含む。比重が低い
ガラス（第一のガラス）の場合、６〜１０重量％のＴｉ
Ｏ2含量、比重がやや高いガラス（第二のガラス）の場
合、７〜１２重量％のＴｉＯ2 含量が好ましい。また、
低い比重のガラスについては、＞２０〜３０重量％、好
ましくは＞２０〜２５重量％の量のＮｂ2 Ｏ5 を添加す
る。やや高い比重が許容されるガラス（第二のガラス）
の場合、１３〜２１重量％のＮｂ2 Ｏ5 含量でよい。さ
らに、本発明のガラスは、２重量％以上、８重量％未満
の量の酸化ジルコニウムを含有する。低密度ガラス（第
一のガラス）の場合には５重量％以上、８重量％未満の
酸化ジルコニウム含量が好ましく、やや高い密度のガラ
ス（第二のガラス）の場合には４重量％以上、８重量％
未満の酸化ジルコニウム含量が許される。成分ＴｉＯ
2 、Ｎｂ2 Ｏ5 及びＺｒＯ2 のうち、成分ＴｉＯ2 は密
度の増加が極めて少なくて屈折率を大幅に増大する効果
がある。但し、軽量ガラスでは１４重量％、特に１０重
量％、やや重いガラスでは１２重量％の含量を超えては
ならない。さもなければ所期のアッベ数がもはや得られ
ない恐れがあるからである。高い含量のＺｒＯ2 は失透
傾向の増大を招くため、ＺｒＯ2 含量の上限は８重量％
未満とする。軽量ガラスのＺｒＯ2 の下限は２重量％、
好ましくは５重量％であるが、やや重いガラスの場合に
は４重量％の下限とされる。これら３つの成分ＴｉＯ
2 、ＺｒＯ2 、Ｎｂ2 Ｏ5 は共に使用する。何故なら、
１つの成分を省けば、残りの２つの成分の含量を増加し
てそれを補っても、失透傾向が増大するからである。１
３〜２１重量％のＮｂ2 Ｏ5 成分を含有するやや重いガ
ラス（第二のガラス）の場合、Ｌａ2 Ｏ3 とＮｂ2 Ｏ5
の比が１．４４を超えるように選定すれば好都合であ
る。やはり屈折率を増大するその他の物質、例えばＴａ
2 Ｏ5 は５重量％以下、好ましくは３重量％以下の量、
ＷＯ3 は２重量％以下の量で含有することができる。し
かし、これらの成分はガラスの密度を高めるので、通常
はＴａ2 Ｏ5 及びＷＯ3 を含まないガラスが好ましいこ
とを考慮しなければならない。In order to obtain the desired high refractive index, the glass contains the component TiO 2 in an amount of 6-14% by weight. In the case of glass having a low specific gravity (first glass), Ti of 6 to 10% by weight
In the case of a glass having a slightly higher O 2 content and specific gravity (second glass), a TiO 2 content of 7 to 12% by weight is preferable. Also,
For low specific gravity glass, Nb 2 O 5 is added in an amount of> 20-30% by weight, preferably> 20-25% by weight. Glass with a slightly higher specific gravity (second glass)
In the case of Nb 2 O 5 content of 13 to 21% by weight is sufficient. Further, the glass of the present invention contains zirconium oxide in an amount of 2% by weight or more and less than 8% by weight. In the case of low density glass (first glass), a zirconium oxide content of 5% by weight or more and less than 8% by weight is preferable, and in the case of slightly high density glass (second glass), 4% by weight or more, 8% by weight or more. weight%
A zirconium oxide content of less than is allowed. Ingredient TiO
Of 2 , 2 , Nb 2 O 5 and ZrO 2 , the component TiO 2 has an extremely small increase in density and is effective in significantly increasing the refractive index. However, the content should not exceed 14% by weight, especially 10% by weight for light weight glass and 12% by weight for moderately heavy glass. Otherwise, the expected Abbe number may no longer be obtained. Since a high content of ZrO 2 causes an increase in the devitrification tendency, the upper limit of the ZrO 2 content is 8% by weight.
Less than The lower limit of ZrO 2 for lightweight glass is 2% by weight,
It is preferably 5% by weight, but in the case of slightly heavy glass, the lower limit is 4% by weight. These three components TiO
2 , ZrO 2 , and Nb 2 O 5 are used together. Because,
This is because if one component is omitted, the devitrification tendency will increase even if the contents of the remaining two components are increased and supplemented. 1
In the case of a slightly heavy glass (second glass) containing 3 to 21% by weight of Nb 2 O 5 component, La 2 O 3 and Nb 2 O 5
It is advantageous to choose such that the ratio of the above exceeds 1.44. Other substances that also increase the refractive index, such as Ta
2 O 5 is 5% by weight or less, preferably 3% by weight or less,
WO 3 can be contained in an amount of 2% by weight or less. However, it should be taken into account that these components usually increase the density of the glass, so that glasses free of Ta 2 O 5 and WO 3 are usually preferred.
【００１１】また、本発明のガラスは、軽量ガラス（第
一のガラス）の場合１１〜２２重量％、好ましくは１２
〜１５重量％、やや重いガラス（第二のガラス）では好
ましくは１０〜２０重量％のＣａＯを含有する。その他
のアルカリ土類酸化物と酸化鉛及び酸化亜鉛は、合計で
最大２重量％ガラス中に含有することができる。その場
合、酸化バリウム、酸化鉛及び酸化マグネシウムの含量
がそれぞれ１重量％を超えないことが好ましい。しか
し、本発明のガラスは、不可避の不純物を除き、Ｍｇ
Ｏ、ＢａＯ、ＳｒＯ及びＰｂＯを含まないことが好まし
い。The glass of the present invention is 11 to 22% by weight, preferably 12 in the case of lightweight glass (first glass).
-15 wt%, and a slightly heavy glass (second glass) preferably contains 10-20 wt% CaO. Other alkaline earth oxides and lead oxide and zinc oxide can be contained in the glass at a maximum of 2% by weight in total. In that case, it is preferable that the contents of barium oxide, lead oxide and magnesium oxide do not exceed 1% by weight, respectively. However, the glass of the present invention is
It is preferable not to contain O, BaO, SrO and PbO.
【００１２】本発明のガラスは、必要に応じてさらにそ
れぞれ最大２重量％の少量のＦ及びＳＯ3 を含むことが
できる。但し、これらの成分はそれぞれ最大１重量％以
下の量であるか、特に全く含有しないことが好ましい。
さらにガラスは、慣用の清澄剤（例えばＡｓ、Ｓｂ又は
Ｃｅの酸化物）を慣用の量（０．１〜０．６重量％、一
般に約０．３重量％以下）で含むことができる。The glasses according to the invention can, if desired, additionally contain small amounts of F and SO 3 each up to 2% by weight. However, it is preferable that the amounts of these components are at most 1% by weight or less, or not contained at all.
In addition, the glass may contain conventional fining agents (e.g. As, Sb or Ce oxides) in conventional amounts (0.1 to 0.6% by weight, generally no more than about 0.3% by weight).
【００１３】[0013]
【実施例】以下、実施例を示して本発明について具体的
に説明するが、本発明が下記実施例に限定されるもので
ないことはもとよりである。EXAMPLES The present invention will be specifically described below with reference to examples, but it goes without saying that the present invention is not limited to the following examples.
【００１４】慣用のガラス原料から８種類のガラス（Ｎ
ｏ．１〜８）を溶製した。組成と性質を表１及び表２に
まとめて示す。ガラスＮｏ．１〜５は４ｇ／ｃｍ3 以下
の密度を有し、一方、ガラスＮｏ．６〜８は４ｇ／ｃｍ
3 を僅かに超える密度を有する。Eight types of glass (N
o. 1-8) was melted. The composition and properties are summarized in Tables 1 and 2. Glass No. 1 to 5 have a density of 4 g / cm 3 or less, while glass No. 6-8 is 4 g / cm
It has a density of slightly over 3 .
【表１】 [Table 1]
【００１５】[0015]
【表２】 [Table 2]
【００１６】[0016]
【発明の効果】以上のように、本発明によれば、密度が
４．２ｇ／ｃｍ3 以下であり、少なくとも１．８５の高
い屈折率を有するガラスが得られる。特に、本発明の低
密度の第一のガラスにおいては、密度が好ましくは４．
０ｇ／ｃｍ3 以下であり、１．８８より大きい屈折率及
び３０以上のアッベ数を有し、また僅かに密度の高い第
二のガラスにおいても、４．１５ｇ／ｃｍ3 以下の密度
であり、しかも１．８８より大きい高い屈折率及び３１
より大きい高いアッベ数を有し、いずれも眼鏡及び光学
ガラスとして有利に用いることができる。さらに、本発
明に係るガラスは、優れた結晶化安定性、良好な耐薬品
性を有し、このように優れた品質の眼鏡及び光学ガラス
を比較的に有利なコストで製造することができる。本発
明の第二のガラスでは、Ｎｂ2 Ｏ5 含量を第一のガラス
より低く抑えることにより、密度は僅かに増大するが、
はるかに安価にガラスを製造できるという利点も得られ
る。As described above, according to the present invention, a glass having a density of 4.2 g / cm 3 or less and a high refractive index of at least 1.85 can be obtained. Particularly in the low-density first glass of the present invention, the density is preferably 4.
0 g / cm 3 or less, having a refractive index greater than 1.88 and an Abbe number of 30 or more, and even in a slightly dense second glass, the density is 4.15 g / cm 3 or less, Moreover, the high refractive index higher than 1.88 and 31
It has a larger higher Abbe number, and both can be advantageously used as spectacles and optical glasses. Furthermore, the glass according to the present invention has excellent crystallization stability and good chemical resistance, and thus it is possible to manufacture eyeglasses and optical glasses of such excellent quality at a relatively advantageous cost. In the second glass of the present invention, by keeping the Nb 2 O 5 content lower than in the first glass, the density is slightly increased,
There is also the advantage of being able to manufacture glass at a much lower cost.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 ダヌータ、グラボウスキィー ドイツ連邦共和国、6204 タウヌスシュタ イン、フォル、デム、キルヒフォルスト 16 (72)発明者 フォルクマール、ガイラー ドイツ連邦共和国、6500 マインツ−フィ ンテン、ゼルトリウスリング 239 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Danuta, Grabowski Germany, 6204 Taunusstein, Fol, Dem, Kirchforst 16 (72) Inventor Volkmar, Gailler Germany, 6500 Mainz-Finten , Sertorius Ring 239
Claims (9)
を特徴とする眼鏡及び光学ガラス。1. A oxide basis in the following composition SiO 2 0 to 12 wt% GeO 2 0 to 3 wt% ΣSiO 2 + GeO 2 0~12 wt% B 2 O 3 14~30 wt% P 2 O 5 0~ 2 wt% Li 2 O 0-2 wt% Na 2 O 0-2 wt% K 2 O 0-2 wt% Cs 2 O 0-2 wt% sigma alkali oxides 0-2 wt% CaO 11 to 22 wt% ΣMgO + SrO + BaO + ZnO + PbO 0 to 2% by weight Al 2 O 3 0 to 2% by weight La 2 O 3 20 to 31% by weight Y 2 O 3 0 to 5% by weight ΣBi 2 O 3 + Gd 2 O 3 0 to 2% by weight ΣLa 2 O 3 + Y 2 O 3 <31 wt% TiO 2 6 to 14 wt% ZrO 2 2 to <8 wt% Ta 2 O 5 0 to 5 wt% Nb 2 O 5 > 20 to 30 wt% WO 3 0 to 2 wt% F have 0-2 wt% sO 3 0 to 2 wt%, optionally Glasses and optical glass characterized by containing an amount of fining agent use.
を特徴とする請求項１に記載のガラス。2. The following composition SiO 2 5-9 wt% B 2 O 3 15-19 wt% Li 2 O 0-1 wt% Na 2 O 0-1 wt% K 2 O 0-1 wt% Cs 2 O 0-1 wt% Σ Alkali oxide 0-1 wt% MgO 0-1 wt% CaO 12-15 wt% SrO 0-2 wt% BaO 0-1 wt% ZnO 0-2 wt% PbO 0-1 wt % ΣMgO + SrO + BaO + PbO 0 to 2% by weight Al 2 O 3 0 to 2% by weight La 2 O 3 23 to 27% by weight Y 2 O 3 0 to 3% by weight ΣLa 2 O 3 + Y 2 O 3 <27% by weight TiO 2 6 to 10% by weight ZrO 2 5 to <8% by weight Ta 2 O 5 0 to 3% by weight Nb 2 O 5 > 20 to 30% by weight WO 30 0 to 2% by weight, if necessary customary amounts of fining The glass according to claim 1, further comprising an agent.
有することを特徴とする請求項１又は２に記載のガラ
ス。3. The glass according to claim 1, which contains> 20.5 to 25% by weight of Nb 2 O 5 .
Ｏ3 を含有しないことを特徴とする請求項１乃至３のい
ずれか一項に記載のガラス。4. MgO, BaO, SrO, PbO and W
The glass according to any one of claims 1 to 3 , which does not contain O 3 .
上のアッベ数νｄ及び４．００ｇ／ｃｍ3 以下の密度を
有することを特徴とする請求項１乃至４のいずれか一項
に記載のガラス。5. The refractive index nd of higher than 1.88, the Abbe number νd of 30 or more, and the density of 4.00 g / cm 3 or less, according to any one of claims 1 to 4. Glass.
を特徴とする眼鏡及び光学ガラス。6. The following composition: SiO 2 0 to 10 wt% GeO 2 0 to 2 wt% ΣSiO 2 + GeO 2 0 to 10 wt% B 2 O 3 13 to 23 wt% P 2 O 5 0 to 2 wt% Li 2 O 0-2% by weight Na 2 O 0-2% by weight K 2 O 0-2% by weight Cs 2 O 0-2% by weight ΣAlkali oxide 0-2% by weight CaO 10-20% by weight ΣMgO + SrO + BaO + ZnO + PbO 0-2 % Al 2 O 3 0-2% by weight La 2 O 3 > 28-33% by weight Y 2 O 3 0-5% by weight ΣBi 2 O 3 + Gd 2 O 3 0-2% by weight ΣLa 2 O 3 + Y 2 O 3> 28 to 33 wt% TiO 2 7 to 12 wt% ZrO 2 4~ <8 wt% Ta 2 O 5 0~5 wt% Nb 2 O 5 13~21 wt% WO 3 0 to 2 wt% F 0 to It has a 1 wt% sO 3 0 to 1% by weight, of customary optionally Glasses and optical glass characterized by containing the refining agent.
Ｏ3 を含有しないことを特徴とする請求項６に記載のガ
ラス。7. MgO, BaO, SrO, PbO and W
The glass according to claim 6, which does not contain O 3 .
あることを特徴とする請求項６又は７に記載のガラス。8. A glass according to claim 6 or 7, characterized in that the ratio La 2 O 5 : Nb 2 O 5 > 1.44.
り大きいアッベ数νｄ及び４．１５ｇ／ｃｍ3 以下の密
度を有することを特徴とする請求項６乃至８のいずれか
一項に記載のガラス。9. A refractive index nd greater than 1.88, an Abbe number νd greater than 31, and a density of 4.15 g / cm 3 or less. Glass.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4225638 | 1992-08-03 | ||
| DE4242859A DE4242859C2 (en) | 1992-08-03 | 1992-12-18 | High-refraction ophthalmic and optical lightweight glass |
| DE4242859.9 | 1992-12-18 | ||
| DE4225638.0 | 1992-12-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0656462A true JPH0656462A (en) | 1994-03-01 |
| JP3269707B2 JP3269707B2 (en) | 2002-04-02 |
Family
ID=25917154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18209593A Expired - Fee Related JP3269707B2 (en) | 1992-08-03 | 1993-06-29 | Eyeglasses and optical lightweight glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3269707B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0992461A1 (en) * | 1998-10-02 | 2000-04-12 | Kabushiki Kaisha Ohara | Ophthalmic and optical glasses |
| US7314841B2 (en) | 2003-05-26 | 2008-01-01 | Murata Manufacturing Co., Ltd. | Porcelain composition |
| US7598193B2 (en) | 2005-02-21 | 2009-10-06 | Hoya Corporation | Optical glass, glass gob for press-molding, optical part, process for producing glass shaped material and process for producing optical part |
| JP2013047168A (en) * | 2010-10-29 | 2013-03-07 | Ohara Inc | Optical glass, preform and optical element |
| JP2013063887A (en) * | 2010-12-13 | 2013-04-11 | Ohara Inc | Optical glass, preform and optical element |
| JP2013063888A (en) * | 2011-09-01 | 2013-04-11 | Ohara Inc | Optical glass, preform and optical element |
| JP2013107810A (en) | 2011-10-28 | 2013-06-06 | Ohara Inc | Optical glass, preform and optical element |
| JP2015147720A (en) * | 2014-01-07 | 2015-08-20 | 日本電気硝子株式会社 | optical glass |
| JP2015147719A (en) * | 2014-01-07 | 2015-08-20 | 日本電気硝子株式会社 | optical glass |
| JP2019104671A (en) * | 2017-06-02 | 2019-06-27 | Hoya株式会社 | Glass, optical glass, and optical element |
| US11554985B2 (en) | 2017-06-23 | 2023-01-17 | AGC Inc. | Optical glass and optical component |
-
1993
- 1993-06-29 JP JP18209593A patent/JP3269707B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0992461A1 (en) * | 1998-10-02 | 2000-04-12 | Kabushiki Kaisha Ohara | Ophthalmic and optical glasses |
| US7314841B2 (en) | 2003-05-26 | 2008-01-01 | Murata Manufacturing Co., Ltd. | Porcelain composition |
| US7598193B2 (en) | 2005-02-21 | 2009-10-06 | Hoya Corporation | Optical glass, glass gob for press-molding, optical part, process for producing glass shaped material and process for producing optical part |
| JP2013047168A (en) * | 2010-10-29 | 2013-03-07 | Ohara Inc | Optical glass, preform and optical element |
| JP2013063887A (en) * | 2010-12-13 | 2013-04-11 | Ohara Inc | Optical glass, preform and optical element |
| JP2013063888A (en) * | 2011-09-01 | 2013-04-11 | Ohara Inc | Optical glass, preform and optical element |
| JP2013107810A (en) | 2011-10-28 | 2013-06-06 | Ohara Inc | Optical glass, preform and optical element |
| JP2015147720A (en) * | 2014-01-07 | 2015-08-20 | 日本電気硝子株式会社 | optical glass |
| JP2015147719A (en) * | 2014-01-07 | 2015-08-20 | 日本電気硝子株式会社 | optical glass |
| JP2019104671A (en) * | 2017-06-02 | 2019-06-27 | Hoya株式会社 | Glass, optical glass, and optical element |
| US11554985B2 (en) | 2017-06-23 | 2023-01-17 | AGC Inc. | Optical glass and optical component |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3269707B2 (en) | 2002-04-02 |
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