JP3458461B2 - Optical glass - Google Patents

Optical glass

Info

Publication number
JP3458461B2
JP3458461B2 JP15630094A JP15630094A JP3458461B2 JP 3458461 B2 JP3458461 B2 JP 3458461B2 JP 15630094 A JP15630094 A JP 15630094A JP 15630094 A JP15630094 A JP 15630094A JP 3458461 B2 JP3458461 B2 JP 3458461B2
Authority
JP
Japan
Prior art keywords
molding
optical glass
yield point
glass
refractive index
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.)
Expired - Lifetime
Application number
JP15630094A
Other languages
Japanese (ja)
Other versions
JPH0826766A (en
Inventor
一博 木戸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nikon Corp
Original Assignee
Nikon Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nikon Corp filed Critical Nikon Corp
Priority to JP15630094A priority Critical patent/JP3458461B2/en
Publication of JPH0826766A publication Critical patent/JPH0826766A/en
Application granted granted Critical
Publication of JP3458461B2 publication Critical patent/JP3458461B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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)

Description

【発明の詳細な説明】 【０００１】 【産業上の利用分野】本発明は、Ｂ2Ｏ3−Ｌｉ2Ｏ−Ｚ
ｎＯ−Ｌａ2Ｏ3の基本組成系からなり、屈折率（ｎｄ）
が約１．６６〜１．７７、アッベ数（νｄ）が約４３〜
５５である光学ガラスに関する。さらに、本発明による
光学ガラスは、低温での成形が可能であり、特にモール
ド成形に有用な光学ガラスに関する。 【０００２】 【従来の技術】近年、光学系を使用する機器の高集積
化、高機能化が進められる中で、光学系に対する高精度
化、軽量・小型化の要求が強く、この要求を実現するた
めに非球面レンズを使用した光学設計が主流となりつつ
ある。このため、非球面レンズを低コストで大量に安定
供給することが必要となり、高精度な金型の面をガラス
素材（軟化状態のゴブ、研磨後の平面ガラスまたは球面
ガラスを軟化状態にしたもの）に加圧転写して、最終的
な研削・研磨工程を要しないで所定の性能を有するレン
ズを得るモールド成形技術が盛んに研究されるようにな
った。さらに、非球面レンズに限らず、複雑な形状を有
するレンズについてもモールド成形技術が研究されるよ
うになってきている。それに伴って、モールド成形に適
した光学ガラスの開発に対する要求も年々高まってきて
いる。 【０００３】上記光学恒数を有する光学ガラスとして
は、Ｂ2Ｏ3、Ｌａ2Ｏ3を必須成分とする種々のガラスが
古くから知られている。しかし、従来のＢ2Ｏ3−Ｌａ2
Ｏ3を必須成分とする光学ガラスは、いずれも化学的耐
久性や耐失透性の向上に重点がおかれており、熱間成形
性については十分な配慮が成されておらず、モールド成
形に適しているとは言い難い。さらに、これらの光学ガ
ラスは、一般に高い屈伏点を持つため、加熱成形時の成
形温度は６５０℃以上となり、高精度の金型の劣化を招
き易く、精度の高いレンズ面を実現することも困難とな
る。そこで、低い屈伏点を持つモールド成形用光学ガラ
スとして、Ｂ2Ｏ3、Ｌｉ2Ｏ、Ｌａ2Ｏ3を主成分とする
種々の光学ガラスが開発され開示されている。例えば、
特開平４−９２８３４号は、ｎｄ＝１．６２２〜１．７
０１、νｄ＝４５．３〜５５．１を特徴とし、実施例に
おいてＡｔ＝５０４〜５４９℃である光学ガラス、特開
平４−９２８３５号は、ｎｄ＝１．７４０〜１．７８
５、νｄ＝３８．０〜４７．０、Ａｔが５７０℃以下
（実施例Ａｔ＝５００〜５６９℃）を特徴とする光学ガ
ラス、特開平５−５８６６９号は、ｎｄ＝約１．６３〜
１．７５、νｄ＝約４５〜６０、Ａｔ＝５５５〜６４０
℃を特徴とする光学ガラス、特開平５−２０１７４３号
は、ｎｄ＝１．６５〜１．７５、νｄが５０以上でＡｔ
＝５６０℃以下を特徴とする光学ガラス等である。 【０００４】特開昭６２−８７４３２号は、アッベ数は
開示されていないが、ｎｄ＝１．６９０〜１．７２５、
Ａｔ＝５７０℃以下で、ＰｂＯを含んだ比較的低温での
精密プレスが可能な光学ガラスである。 【０００５】 【本発明が解決しようとする課題】しかし、上記従来の
光学ガラス、特にモールド成形用光学ガラスは、加熱成
形時にガラス組成中の特定元素が揮発し、金型に付着す
ることにより、高精度なモールド成形を困難にするとい
う問題点があった。また、分析等の結果から、金型に付
着する元素は、主に、低屈伏点を実現するために含有さ
せた比較的多量のアルカリ金属酸化物または酸化鉛であ
ることがわかっている。 【０００６】これらの元素は高精度なモールド成形を困
難にするだけでなく、多量のアルカリ金属酸化物は化学
的耐久性を低下させ、酸化鉛は製造工程で環境汚染につ
ながるという問題点もある。そこで本発明は、上記した
従来の光学ガラス、特にモールド成形用光学ガラスの諸
問題に鑑みてなされたものである。 【０００７】本発明の目的は、屈折率（ｎｄ）が１．６
６〜１．７７、アッベ数（νｄ）が４３〜５５の光学恒
数を持ち、屈伏点がモールド成形に適した６２０℃以下
であり、さらにモールド成形中にガラスの組成成分が揮
発することなく、化学的耐久性、失透に対する安定性に
優れ、環境汚染のない新規な光学ガラスを提供すること
である。 【０００８】 【課題を解決するための手段】本発明者は、上記目的を
達成するために鋭意研究を重ねた結果、Ｂ2Ｏ3、Ｌｉ2
Ｏ、ＺｎＯ、Ｌａ2Ｏ3を必須成分とする光学ガラス組成
が、所定の組成範囲内において所望の光学恒数とモール
ド成形に適した屈伏点を持ち、さらにモールド成形中に
ガラスの組成成分が揮発することなく、優れた化学的耐
久性、失透に対する安定性を実現できることを見い出
し、本発明を成すに至った。すなわち、本発明は、重量
比（ｗｔ％）で、 ＳｉＯ2 ０ 〜 ５ ｗｔ％ Ｂ2Ｏ3 ２２ 〜 ３５ ｗｔ％ Ａｌ2Ｏ3 ０ 〜 ５ ｗｔ％ Ｌｉ2Ｏ ０．１〜 １．１ｗｔ％ Ｎａ2Ｏ ０ 〜 ５ ｗｔ％ Ｋ2Ｏ ０ 〜 ５ ｗｔ％ 但し、Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ ０．１〜 ５．５ｗｔ％ ＭｇＯ ０ 〜 ５ ｗｔ％ ＣａＯ ０ 〜 １０ ｗｔ％ ＳｒＯ ０ 〜 １０ ｗｔ％ ＢａＯ ０ 〜 １０ ｗｔ％ ＺｎＯ ２１．１〜 ３５ ｗｔ％ ＺｒＯ2 ０ 〜 ５ ｗｔ％ Ｌａ2Ｏ3 １２ 〜 ４２ ｗｔ％ Ｇｄ2Ｏ3 ０ 〜 ２０ ｗｔ％ Ｙ2Ｏ3 ０ 〜 １０ ｗｔ％ Ｙｂ2Ｏ3 ０ 〜 １０ ｗｔ％ Ｎｂ2Ｏ5 ０ 〜 １０ ｗｔ％ Ｔａ2Ｏ5 ０ 〜 １４ ｗｔ％ Ａｓ2Ｏ3 ０ 〜 １ ｗｔ％ Ｓｂ2Ｏ3 ０ 〜 １ ｗｔ％ の組成からなり、屈折率（ｎｄ）が１．６６〜１．７
７、アッベ数（νｄ）が４３〜５５、屈伏点（Ａｔ）が
６２０℃以下であることを特徴とするモールド成形用光
学ガラスを提供する。 【０００９】 【作用】上記組成範囲は、実験化学的に見い出されたも
のであり、組成範囲限定の理由は次の通りである。Ｓｉ
Ｏ2はガラス形成酸化物であり、失透に対する安定性を
向上させるが、５ｗｔ％を越えると、未溶物が生じ易く
なり、溶融温度及び屈伏点を上昇させる。 【００１０】Ｂ2Ｏ3はＳｉＯ2と同様にガラス形成酸化
物であり、本発明において必須成分である。２２ｗｔ％
未満では失透に対して十分な安定性を得られないが、３
５ｗｔ％を越えると屈折率が低下し、化学的耐久性を低
下させる。Ａｌ2Ｏ3は失透に対する安定性、化学的耐久
性を向上させるが、５ｗｔ％を越えると屈伏点を上昇さ
せる。 【００１１】Ｌｉ2Ｏは他のアルカリ金属酸化物に比べ
て大幅な屈折率低下、化学的耐久性の低下を伴うことな
く、溶融温度及び屈伏点を低下させる必須成分である
が、０．１ｗｔ％未満では十分な効果が得られず、２．
５ｗｔ％を越えると化学的耐久性及び失透に対する安定
性が低下する。さらに、Ｌｉ2Ｏは成形時に揮発して成
形型に付着し易く、高精度なモールド成形が困難にな
る。 【００１２】Ｎａ2Ｏ、Ｋ2Ｏは溶融温度及び屈伏点を低
下させるが、５ｗｔ％を越えると屈折率が低下し、化学
的耐久性及び失透に対する安定性も低下する。さらに、
Ｎａ 2Ｏ、Ｋ2Ｏは成形時に揮発して成形型に付着し易
く、高精度なモールド成形が困難になる。但し、Ｌｉ2
Ｏ、Ｎａ2Ｏ、Ｋ2Ｏの合計量として、５．５ｗｔ％を越
えると、屈折率が低下し、化学的耐久性及び失透に対す
る安定性も低下する。さらに、これらのアルカリ金属酸
化物は成形時に揮発して成形型に付着し易く、高精度な
モールド成形が困難になる。。 【００１３】ＭｇＯは溶融温度を低下させるが、５ｗｔ
％を越えると失透に対する安定性が低下し、分相傾向も
増大する。ＣａＯ、ＳｒＯ、ＢａＯは屈折率の調整、失
透に対する安定性向上に有用であるが、１０ｗｔ％を越
えると逆に失透傾向が増大し、化学的耐久性を低下させ
る。 【００１４】ＺｎＯは溶融温度及び屈伏点を低下させ、
屈折率の調整にも有効な必須成分であるが、２０ｗｔ％
未満では十分な効果が得られず、３５ｗｔ％を越えると
分散が大きくなり、失透に対する安定性が低下し、化学
的耐久性も低下する。ＺｒＯ2は失透に対する安定性、
化学的耐久性を向上させるが、５ｗｔ％を越えると、逆
に失透傾向が増大し、屈伏点も上昇する。 【００１５】Ｌａ2Ｏ3は比較的に失透に対する安定性を
低下させることなく、屈折率を高くし、化学的耐久性を
向上させる必須成分であるが、１２ｗｔ％未満では十分
な効果が得られず、４２ｗｔ％を越えると失透に対する
安定性が低下し、屈伏点も上昇する。Ｇｄ2Ｏ3は比較的
に失透に対する安定性を低下させることなく、屈折率を
高くし、化学的耐久性を向上させるが、２０ｗｔ％を越
えると失透に対する安定性が低下し、屈伏点も上昇す
る。 【００１６】Ｙ2Ｏ3、Ｙｂ2Ｏ3は屈折率を高くし、化学
的耐久性を向上させるが、１０ｗｔ％を越えると失透に
対する安定性が低下し、屈伏点も上昇する。Ｎｂ2Ｏ5、
Ｔａ2Ｏ5は屈折率を高くし、化学的耐久性を向上させる
が、それぞれ１０ｗｔ％、１４ｗｔ％を越えると分散を
大きくし、失透に対する安定性も低下する。 【００１７】Ａｓ2Ｏ3、Ｓｂ2Ｏ3は脱泡剤として用いる
が、１ｗｔ％以下で十分な効果を得ることができる。ま
た、Ｓｂ2Ｏ3は１ｗｔ％を越えるとガラスに着色が認め
られる。 【００１８】 【実施例】以下、本発明を実施例によりさらに具体的に
説明するが、本発明はこれらの例に限定されるものでは
ない。本発明に係る実施組成例（数値はｗｔ％）を、光
学恒数（ｎｄ，νｄ）及び屈伏点（Ａｔ、数値は℃）と
ともに表１、表２、表３に示す。但し、表１中のＮｏ．
１、５、６、表２中のＮｏ．８、１０、表３中のＮｏ．
１５は、実施組成例から除く。 【００１９】本発明に係る光学ガラスは、各成分の原料
として各々相当する酸化物、炭酸塩、硝酸塩等を使用
し、所望の割合に秤量し、粉末で十分に混合して調合原
料と成し、これを例えば１０５０〜１３００℃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の鋳型に鋳込み、徐冷して
製造することができる。 【００２０】 【表１】【００２１】 【表２】【００２２】 【表３】【００２３】 【発明の効果】以上の通り、本発明によれば、屈折率
（ｎｄ）が１．６６〜１．７７、アッベ数（νｄ）が４
３〜５５、屈伏点（Ａｔ）が６２０℃以下であることを
特徴とし、化学的耐久性、失透に対する安定性に優れ、
環境汚染がない光学ガラスが提供される。 【００２４】しかも、本発明による光学ガラスは屈伏点
が低いため、特に、高精度な金型の面をガラス素材に加
圧転写して、最終的な研削・研磨工程を要しないで所定
の性能を有するレンズを得るモールド成形にきわめて有
用である。DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTIONTwoOThree−LiTwoO-Z
nO-LaTwoOThreeAnd a refractive index (nd)
Is about 1.66 to 1.77, Abbe number (νd) is about 43 to
55. Further according to the invention
Optical glass can be molded at low temperatures, especially in molding
The present invention relates to an optical glass useful for molding. [0002] 2. Description of the Related Art In recent years, highly integrated equipment using an optical system has been developed.
High precision for optical systems as
There is a strong demand for miniaturization, light weight, and miniaturization.
Optical design using aspherical lens is becoming mainstream
is there. For this reason, aspherical lenses can be mass-produced at low cost.
It is necessary to supply a high-precision mold
Material (soft gob, polished flat glass or spherical surface
Pressure transfer to softened glass)
With the required performance without the need for complicated grinding and polishing processes
Research on molding technology to obtain
Was. Furthermore, not only aspherical lenses but also complex shapes are available.
Molding technology will be studied for lenses that do
It's getting bigger. Accordingly, it is suitable for molding.
The demand for the development of improved optical glass is increasing year by year
I have. As an optical glass having the above optical constants,
Is BTwoOThree, LaTwoOThreeVarious glasses with essential components
It has been known for a long time. However, the conventional BTwoOThree-LaTwo
OThreeOptical glass containing
The emphasis is on improving durability and devitrification resistance, and hot forming
The moldability has not been sufficiently considered.
It is hard to say that it is suitable for the shape. In addition, these optical
Since laths generally have a high yield point,
Mold temperature is over 650 ° C, which causes high-precision mold deterioration.
It is difficult to realize a highly accurate lens surface.
You. Therefore, optical glass for molding with a low yield point
BTwoOThree, LiTwoO, LaTwoOThreeThe main component
Various optical glasses have been developed and disclosed. For example,
JP-A-4-92834 discloses that nd = 1.622 to 1.7.
01, νd = 45.3 to 55.1.
Glass having At = 504-549 ° C.
No. 4-92835, nd = 1.740 to 1.78
5, νd = 38.0-47.0, At is 570 ° C. or less
(Example At = 500-569 ° C.)
Lass, JP-A-5-58669 discloses that nd = about 1.63.
1.75, vd = about 45-60, At = 555-640
Optical glass characterized by ° C, JP-A-5-201743
Means that nd = 1.65 to 1.75, νd is 50 or more, and At is
= 560 ° C. or lower. JP-A-62-87432 discloses that the Abbe number is
Although not disclosed, nd = 1.690-1.725,
At = 570 ° C. or lower and at a relatively low temperature containing PbO
Optical glass that can be precision pressed. [0005] [Problems to be solved by the present invention]
Optical glass, especially optical glass for molding, is heated
Specific elements in the glass composition volatilize during molding and adhere to the mold
This makes high-precision molding difficult.
There was a problem. Also, based on the results of analysis, etc.,
The elements to be deposited are mainly included to achieve a low yield point.
A relatively large amount of alkali metal oxide or lead oxide
I know that [0006] These elements make high-precision molding difficult.
Not only makes it difficult, but large amounts of alkali metal oxides
Oxides reduce environmental durability and lead oxides reduce environmental pollution during the manufacturing process.
There is also a problem that it goes on. Therefore, the present invention has been described above.
Various types of conventional optical glass, especially optical glass for molding
This was done in view of the problem. An object of the present invention is to provide a refractive index (nd) of 1.6.
6 to 1.77 and an optical constant of Abbe number (νd) of 43 to 55.
With a yield point of 620 ° C or less suitable for molding
In addition, the composition of the glass
Without emission, chemical durability, stability against devitrification
Providing new optical glass that is excellent and does not pollute the environment
It is. [0008] The inventor of the present invention has achieved the above object.
As a result of intensive research to achieveTwoOThree, LiTwo
O, ZnO, LaTwoOThreeOptical glass composition containing as an essential component
Is the desired optical constant and molding within a predetermined composition range.
Has a yield point suitable for molding
Excellent chemical resistance without volatilization of glass components
Of stability and stability against devitrification
Thus, the present invention has been accomplished. That is, the present invention
Ratio (wt%) SiOTwo        0 to 5 wt% BTwoOThree       22 to 35 wt% AlTwoOThree       0 to 5 wt% LiTwoO 0.1 ~1.1wt% NaTwoO 0 to 5 wt% KTwoO 0 to 5 wt% However, LiTwoO + NaTwoO + KTwoO 0.1-5.5wt% MgO 0 to 5 wt% CaO 0 to 10 wt% SrO 0-10 wt% BaO 0-10 wt% ZnO21.1~ 35 wt% ZrOTwo        0 to 5 wt% LaTwoOThree      12 to 42 wt% GdTwoOThree        0 to 20 wt% YTwoOThree          0 to 10 wt% YbTwoOThree        0 to 10 wt% NbTwoOFive        0 to 10 wt% TaTwoOFive        0 to 14 wt% AsTwoOThree        0 to 1 wt% SbTwoOThree        0 to 1 wt% Composition ofConsists of, Refractive index (nd) 1.66 to 1.7
7, Abbe number (νd) is 43 to 55, yield point (At) is
620 ° C. or lower, light for molding
Provide study glass. [0009] The above composition range has been found experimentally.
The reason for limiting the composition range is as follows. Si
OTwoIs a glass-forming oxide and has stability against devitrification.
However, if it exceeds 5 wt%, undissolved matter is likely to be generated.
Increases the melting temperature and yield point. BTwoOThreeIs SiOTwoGlass forming oxidation as well
And an essential component in the present invention. 22wt%
If it is less than 3, sufficient stability against devitrification cannot be obtained.
If it exceeds 5% by weight, the refractive index decreases and the chemical durability decreases.
Let it down. AlTwoOThreeIs stability against devitrification, chemical durability
The yield point is increased when the content exceeds 5 wt%.
Let LiTwoO compared to other alkali metal oxides
Without significant decrease in refractive index and chemical durability
It is an essential component that lowers the melting temperature and yield point
However, if the content is less than 0.1 wt%, a sufficient effect cannot be obtained.
If it exceeds 5 wt%, it is stable against chemical durability and devitrification.
Is reduced. Furthermore, LiTwoO volatilizes during molding and forms
It easily adheres to the mold, making high-precision molding difficult.
You. NaTwoO, KTwoO lowers melting temperature and yield point
However, if it exceeds 5 wt%, the refractive index decreases,
The durability and stability against devitrification are also reduced. further,
Na TwoO, KTwoO volatilizes during molding and easily adheres to the mold
And high-precision molding is difficult. However, LiTwo
O, NaTwoO, KTwoThe total amount of O exceeds 5.5 wt%
Lowering the refractive index reduces chemical durability and devitrification.
Stability is also reduced. In addition, these alkali metal acids
The compound volatilizes during molding and easily adheres to the mold.
Molding becomes difficult. . Although MgO lowers the melting temperature, 5 wt.
%, The stability against devitrification decreases, and the phase separation tendency also increases.
Increase. CaO, SrO, and BaO adjust or reduce the refractive index.
Useful for improving stability against permeability, but exceeding 10 wt%
Conversely, the tendency to devitrification increases, reducing chemical durability
You. ZnO lowers the melting temperature and yield point,
An essential component that is also effective in adjusting the refractive index, but 20 wt%
If the amount is less than 35%, sufficient effects cannot be obtained.
Greater dispersion, lower stability against devitrification,
Target durability also decreases. ZrOTwoIs stability against devitrification,
Improves chemical durability, but over 5 wt%, reverse
The tendency to devitrification increases, and the yield point also increases. LaTwoOThreeIs relatively stable against devitrification
Without lowering, increase the refractive index and increase the chemical durability
An essential component to improve, but less than 12 wt% is sufficient
Effect cannot be obtained.
The stability decreases and the yield point increases. GdTwoOThreeIs relatively
The refractive index without lowering the stability against devitrification
To increase the chemical durability, but exceed 20 wt%
Lowers the stability against devitrification and increases the yield point
You. YTwoOThree, YbTwoOThreeIncreases the refractive index,
Durability is improved, but devitrification occurs when it exceeds 10 wt%
Stability decreases and the yield point also increases. NbTwoOFive,
TaTwoOFiveIncreases the refractive index and improves the chemical durability
However, if they exceed 10 wt% and 14 wt%, respectively,
And the stability against devitrification also decreases. AsTwoOThree, SbTwoOThreeIs used as a defoamer
However, a sufficient effect can be obtained at 1 wt% or less. Ma
SbTwoOThreeExceeds 1 wt%, coloring of glass is recognized
Can be [0018] EXAMPLES Hereinafter, the present invention will be described more specifically by way of examples.
Explain, but the invention is not limited to these examples
Absent. Example composition (numerical value is wt%) according to the present invention
The scientific constant (nd, νd) and the yield point (At, numerical value is ° C)
All are shown in Tables 1, 2 and 3.However, in Table 1, No.
Nos. 1, 5, 6, and 2 in Table 2. 8, 10 and No. 3 in Table 3.
15 is excluded from the working composition examples. The optical glass according to the present invention is a raw material for each component.
Use the corresponding oxides, carbonates, nitrates, etc.
Weigh to the desired ratio, mix well with powder and mix
And heated to, for example, 1050 to 1300 ° C.
Into a platinum crucible in an electric furnace that has been melted and clarified.
And cast into a preheated iron mold,
Can be manufactured. [0020] [Table 1][0021] [Table 2][0022] [Table 3][0023] As described above, according to the present invention, the refractive index
(Nd) is 1.66 to 1.77, Abbe number (νd) is 4
3-55, that the yield point (At) is 620 ° C or less
Features, excellent chemical durability, stability against devitrification,
An optical glass free of environmental pollution is provided. Moreover, the optical glass according to the present invention has a yield point
Is low, especially when the high-precision mold surface is added to the glass material.
Pressure transfer and specified without final grinding / polishing process
Very useful for molding to obtain lenses with excellent performance
It is for.

Claims (1)

(57)【特許請求の範囲】 【請求項１】重量比（以下ｗｔ％）で、 ＳｉＯ2 ０ 〜 ５ ｗｔ％ Ｂ2Ｏ3 ２２ 〜 ３５ ｗｔ％ Ａｌ2Ｏ3 ０ 〜 ５ ｗｔ％ Ｌｉ2Ｏ ０．１〜 １．１ｗｔ％ Ｎａ2Ｏ ０ 〜 ５ ｗｔ％ Ｋ2Ｏ ０ 〜 ５ ｗｔ％ 但し、Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ ０．１〜 ５．５ｗｔ％ ＭｇＯ ０ 〜 ５ ｗｔ％ ＣａＯ ０ 〜 １０ ｗｔ％ ＳｒＯ ０ 〜 １０ ｗｔ％ ＢａＯ ０ 〜 １０ ｗｔ％ ＺｎＯ ２１．１〜 ３５ ｗｔ％ ＺｒＯ2 ０ 〜 ５ ｗｔ％ Ｌａ2Ｏ3 １２ 〜 ４２ ｗｔ％ Ｇｄ2Ｏ3 ０ 〜 ２０ ｗｔ％ Ｙ2Ｏ3 ０ 〜 １０ ｗｔ％ Ｙｂ2Ｏ3 ０ 〜 １０ ｗｔ％ Ｎｂ2Ｏ5 ０ 〜 １０ ｗｔ％ Ｔａ2Ｏ5 ０ 〜 １４ ｗｔ％ Ａｓ2Ｏ3 ０ 〜 １ ｗｔ％ Ｓｂ2Ｏ3 ０ 〜 １ ｗｔ％ の組成からなり、屈折率（ｎｄ）が１．６６〜１．７
７、アッベ数（νｄ）が４３〜５５、屈伏点（Ａｔ）が
６２０℃以下であることを特徴とする光学ガラス。(57) [Claims] [Claim 1] SiO 2 0 to 5 wt% B 2 O 3 22 to 35 wt% Al 2 O 3 0 to 5 wt% Li 2 in weight ratio (hereinafter referred to as wt%) O 0.1 to 1.1 wt% Na 2 O 0 to 5 wt% K 2 O 0 to 5 wt% However, Li 2 O + Na 2 O + K 2 O 0.1 to 5.5 wt% MgO 0 to 5 wt% CaO 0 ~ 10 wt% SrO 0 ~ 10 wt% BaO 0 ~ 10 wt% ZnO 21.1 ~ 35 wt% ZrO 2 0 ~ 5 wt% La 2 O 3 12 ~ 42 wt% Gd 2 O 3 0 ~ 20 wt% Y 2 O 3 0 ~ 10 wt % Yb 2 O 3 0 ~ 10 wt% Nb 2 O 5 0 ~ 10 wt% Ta 2 O 5 0 ~ 14 wt% As 2 O 3 0 ~ 1 wt% Sb 2 O 3 0 -1 wt%, and a refractive index (nd) of 1.66-1.7.
7. An optical glass characterized by having an Abbe number (νd) of 43 to 55 and a yield point (At) of 620 ° C. or less.
JP15630094A 1994-07-07 1994-07-07 Optical glass Expired - Lifetime JP3458461B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15630094A JP3458461B2 (en) 1994-07-07 1994-07-07 Optical glass

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15630094A JP3458461B2 (en) 1994-07-07 1994-07-07 Optical glass

Publications (2)

Publication Number Publication Date
JPH0826766A JPH0826766A (en) 1996-01-30
JP3458461B2 true JP3458461B2 (en) 2003-10-20

Family

ID=15624802

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15630094A Expired - Lifetime JP3458461B2 (en) 1994-07-07 1994-07-07 Optical glass

Country Status (1)

Country Link
JP (1) JP3458461B2 (en)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002201038A (en) * 2000-12-28 2002-07-16 Matsushita Electric Ind Co Ltd Glass for mold lens
JP4093524B2 (en) 2001-02-20 2008-06-04 Ｈｏｙａ株式会社 Optical glass, press-molding preform and optical parts
JP3943348B2 (en) * 2001-06-06 2007-07-11 株式会社オハラ Optical glass
JP4003874B2 (en) * 2001-10-24 2007-11-07 Ｈｏｙａ株式会社 Optical glass, press-molding preforms and optical components
JP3555681B2 (en) * 2001-10-29 2004-08-18 日本電気硝子株式会社 Glass for mold press molding
JP3912774B2 (en) * 2002-03-18 2007-05-09 Ｈｏｙａ株式会社 Optical glass for precision press molding, preform for precision press molding and manufacturing method thereof
US7232779B2 (en) * 2002-08-20 2007-06-19 Hoya Corporation Optical glass, precision press molding preform and method of manufacturing the same, optical element and method of manufacturing the same
JP4563934B2 (en) * 2003-03-31 2010-10-20 日本山村硝子株式会社 Optical glass for precision mold press molding
JP4453328B2 (en) * 2003-10-09 2010-04-21 日本電気硝子株式会社 Mold press molding glass and method for producing the same
US7576020B2 (en) 2004-10-12 2009-08-18 Hoya Corporation Optical glass, precision press-molding preform, process for the production of the preform, optical element and process for the production of the optical element
JP4560438B2 (en) * 2005-04-27 2010-10-13 日本山村硝子株式会社 Optical glass
WO2007097345A1 (en) 2006-02-20 2007-08-30 Asahi Glass Co., Ltd. Optical glass
CN101389576A (en) * 2006-02-24 2009-03-18 旭硝子株式会社 Optical glass and lens
WO2009072586A1 (en) * 2007-12-06 2009-06-11 Asahi Glass Co., Ltd. Optical glass, and preform for fine press molding and optical element each comprising the same
CN102849940A (en) * 2011-11-30 2013-01-02 湖北新华光信息材料有限公司 Environment-friendly lanthanum flint optical glass with high refractive index
JP5734245B2 (en) * 2012-07-17 2015-06-17 Hoya株式会社 Optical glass, press-molding preform and optical parts
JP5734246B2 (en) * 2012-07-17 2015-06-17 Hoya株式会社 Optical glass, press-molding preform and optical parts
CN107512849A (en) * 2012-11-23 2017-12-26 成都光明光电股份有限公司 Optical glass and optical element
CN102923952A (en) * 2012-11-23 2013-02-13 成都光明光电股份有限公司 Optical glass, glass prefabricated part and optical element
JP5902327B2 (en) * 2015-01-23 2016-04-13 Hoya株式会社 Optical glass, press-molding preform and optical parts
JP6866012B2 (en) * 2015-11-06 2021-04-28 株式会社オハラ Optical glass, preform materials and optical elements
JP7174536B2 (en) * 2017-05-16 2022-11-17 株式会社オハラ Optical glass, preforms and optical elements
JP7446052B2 (en) * 2017-07-27 2024-03-08 株式会社オハラ Optical glass, preforms and optical elements

Also Published As

Publication number Publication date
JPH0826766A (en) 1996-01-30

Similar Documents

Publication Publication Date Title
JP3458461B2 (en) Optical glass
JP3458462B2 (en) Optical glass
JP3943348B2 (en) Optical glass
JP3377454B2 (en) Optical glass for mold press
JP3113604B2 (en) Optical glass with negative anomalous dispersion
US5744409A (en) Optical glass
JP2668049B2 (en) Optical glass
JP4034589B2 (en) Optical glass
JP3015078B2 (en) Optical glass for precision press
WO2008046300A1 (en) High-refractivity low-dispersion optical glass for precise press molding
JP2000128568A (en) Lead-free optical glass
JP2002201039A (en) Glass for press forming and lens
EP1568665A2 (en) An optical glass for precision molding
CN1970480A (en) Optical glass and optical element
JP3100726B2 (en) Optical glass for precision press molding
JP2616980B2 (en) Optical glass for precision press molding
JPH0859282A (en) Optical glass
JP3987174B2 (en) Optical glass for precision press molding
JP3157458B2 (en) Optical glass for mold press
JPH08259257A (en) Optical glass
JP4818538B2 (en) Optical glass for molding
JP2002211949A (en) Optical glass for press molding, preform material for press molding and optical element using the same
JP3015079B2 (en) Optical glass for precision press
JP4289450B2 (en) Optical glass
JP5690505B2 (en) Optical glass, mold press molding preform and optical element

Legal Events

Date Code Title Description
FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090808

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120808

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120808

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140808

Year of fee payment: 11

EXPY Cancellation because of completion of term