JP4059695B2 - Optical glass - Google Patents
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- JP4059695B2 JP4059695B2 JP2002099809A JP2002099809A JP4059695B2 JP 4059695 B2 JP4059695 B2 JP 4059695B2 JP 2002099809 A JP2002099809 A JP 2002099809A JP 2002099809 A JP2002099809 A JP 2002099809A JP 4059695 B2 JP4059695 B2 JP 4059695B2
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- 239000005304 optical glass Substances 0.000 title claims description 25
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000007704 transition Effects 0.000 claims description 8
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 3
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 3
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 3
- 238000004031 devitrification Methods 0.000 description 15
- 239000011521 glass Substances 0.000 description 12
- 238000000465 moulding Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 229910000464 lead oxide Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000009477 glass transition Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004017 vitrification Methods 0.000 description 2
- 229910005793 GeO 2 Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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
- C03C3/16—Silica-free oxide glass compositions containing phosphorus
- C03C3/21—Silica-free oxide glass compositions containing phosphorus containing titanium, zirconium, vanadium, tungsten or molybdenum
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
【０００１】
【発明の属する技術分野】
本発明は、屈折率（ｎd）が１．８８以上及びアッベ数（νd）が２３以下の範囲の光学定数を有する光学ガラスであって、精密モールドプレス成形に適した光学ガラスに関する。
【０００２】
【従来の技術】
従来、高屈折率領域の光学ガラスは酸化鉛を多量に含有する組成系が代表的であり、耐失透性が高いために安定で、かつガラス転移点（Ｔｇ）が低いため、精密モールドプレス成形用として使用されてきた。例えば、特開平１−３０８８４３号公報には酸化鉛を多量に含有する精密モールドプレス用の光学ガラスが開示されている。
【０００３】
しかしながら精密モールドプレス成形を実施する場合の環境は金型の酸化防止のために還元性雰囲気に保たれているため、ガラス成分に酸化鉛を含有しているとガラス表面から還元された鉛が析出し、金型表面に付着してしまい、金型の精密面を維持できなくなるという問題点があった。また、酸化鉛は環境に対して有害であり、フリー化が望まれてきた。
【０００４】
特開平８−１５７２３１号公報には酸化鉛を含有せず、屈伏点の低い光学ガラスが開示されている。しかし、ここに開示された光学ガラスの屈折率（ｎｄ）は、１．７０〜１．７７（第１の態様）及び１．７７〜１．８５（第２の態様）の範囲である。
【０００５】
特開２００１−５８８４５号公報には酸化鉛を含有せず、屈折率（ｎｄ）が１．８３以上であり、屈伏点が５５０℃以下の光学ガラスが開示されている。しかし、屈折率（ｎd）が１．８８以上の高屈折率組成では、ガラス化せず、乳白化し易い傾向があった。
【０００６】
【発明が解決しようとする課題】
本発明は前記従来の光学ガラスに見られる諸欠点を改善し、屈折率（ｎd）が１．８８以上、アッベ数（νd）が２３以下の範囲の光学定数を有し、ガラス転移点（Ｔｇ）が低い、精密モールドプレス成形に適した光学ガラスを提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明者は上記課題を解決するために鋭意試験研究を重ねた結果、屈折率（ｎd）が１．８８〜１．９３、アッベ数（νd）が１８〜２３の範囲の光学定数を有し、ガラス転移点（Ｔｇ）が４８０〜５８０℃の範囲にあり、かつ環境上好ましくない物質を含まず、精密モールドプレス性が極めて良好であるという光学ガラスを見いだし、本発明に至ったものである。
【０００８】
すなわち、前記目的を達成すべく、請求項１に記載の発明は、屈折率（ｎd）が１．８８以上及びアッベ数（νd）が２３以下の範囲の光学定数を有する光学ガラスであって、質量％で、
Ｂ2Ｏ3 ０〜１０％
Ｐ2Ｏ5 １０〜３０％
Ｂｉ2Ｏ3 １０〜２５％
ＴｉＯ2 ０．５〜１０％
Ｎｂ2Ｏ5 ３０〜５０％
ＷＯ3 ０〜２％
ＲＯ ０〜１０％
ただし、ＲはＣａ、Ｂａ、Ｚｎのうちの１種以上
Ｌｉ2Ｏ ０〜６％
Ｎａ2Ｏ ５〜１５％
の範囲の各成分を含有し、転移点（Ｔｇ）が４８０〜５８０℃の範囲にあることを特徴とする光学ガラスである。
【０００９】
本発明の光学ガラスは、高屈折率、高分散であると共に、４８０〜５８０℃の範囲の低い転移点（Ｔｇ）を有する。本発明の光学ガラスは、より好ましくは転移点（Ｔｇ）が５００〜５８０℃を有する。
【００１０】
本発明の光学ガラスを構成する各成分の組成範囲を前記の通りに限定した理由を以下に述べる。各成分は質量％にて表現する。
【００１１】
Ｂ2Ｏ3成分は耐失透性の向上および低Ｔｇ化に有効な成分であるが、その量が１０％を超えると逆に耐失透性が悪くなる。従って、０〜１０％の範囲に限定される。より好ましくは０〜８％の範囲にあり、特に好ましくは２〜６％の範囲にある。
【００１２】
Ｐ2Ｏ5成分はガラス形成酸化物として働く必須成分であり、耐失透性の向上に有効な成分であるが、その量が１０％未満ではその効果が不十分であり、３０％を超えると本発明の目的とする屈折率（ｎｄ）を満足できなくなる。従って、１０〜３０％の範囲に限定される。より好ましくは１０％以上２５％未満の範囲にあり、特に好ましくは１２％以上２４％未満の範囲にある。
【００１３】
Ｂｉ2Ｏ3成分はガラスの屈折率を高めつつ、低Ｔｇ化させるのに非常に重要な必須成分である。しかし、その量が５％未満ではその効果が不十分であり、２５％を超えると耐失透性が悪くなる。従って、５〜２５％の範囲に限定される。より好ましくは１０％を越えて２４％以下の範囲にあり、特に好ましくは１２〜２０％の範囲にある。
【００１４】
ＧｅＯ2成分は、ガラスの屈折率を高めるために添加しうるが、原料が非常に高価であるため、０％以上６％未満が好ましく、０％以上４％未満がより好ましく、０％以上２％未満が特に好ましい。
【００１５】
ＴｉＯ2成分は屈折率（ｎｄ）を高めるために非常に重要な必須成分であるが、その量が０．５％未満では効果が小さく、１０％を超えると耐失透性が悪くなる。従って、０．５〜１０％の範囲に限定される。より好ましくは２〜１０％の範囲にあり、特に好ましくは４〜８％の範囲にある。
【００１６】
Ｎｂ2Ｏ5成分は目的の屈折率を満足するために非常に重要な必須成分であるが、その量が３０％未満では効果が見られず、５０％を超えると耐失透性が悪くなる。従って、３０〜５０％の範囲に限定される。より好ましくは３２〜５０％の範囲にあり、特に好ましくは３４〜４８％の範囲にある。
【００１７】
ＷＯ3成分は屈折率（ｎｄ）を高め、耐失透性を改善する効果があるが、その量が１０％を超えると逆に耐失透性が悪くなる。従って、０〜１０％の範囲に限定される。より好ましくは０〜１０％未満の範囲にあり、特に好ましくは０〜８％の範囲にある。
【００１８】
ＲＯ成分（Ｒ＝Ｃａ、Ｂａ、Ｚｎ）は耐失透性の向上、低Ｔｇ化に効果があるが、その量が１０％を超えると逆に耐失透性や化学的耐久性が悪くなる。従って、０〜１０％の範囲に限定される。より好ましくは０〜１０％未満の範囲にあり、特に好ましくは０．５〜８％の範囲にある。
【００１９】
Ｌｉ2Ｏ成分はＴｇを大幅に下げるのに有効な成分であるが、６％を超えると耐失透性が急激に低下する。従って、０〜６％の範囲に限定される。より好ましくは０％以上６％未満の範囲にあり、特に好ましくは０．５〜４％の範囲にある。
【００２０】
Ｎａ2Ｏ成分はＴｇを下げつつ、ガラスを安定化させるのに有効な必須成分であるが、その量が５％未満では効果が不十分であり、１５％を超えると逆に耐失透性が悪くなる。従って、５〜１５％の範囲に限定される。より好ましくは５％を越えて１５％未満の範囲にあり、特に好ましくは７％を越えて１２％未満の範囲にある。
【００２１】
Ｋ2Ｏ成分もＮａ2Ｏ成分と同様に、Ｔｇを下げつつ、ガラスを安定化させるために添加しうるが、その量は６％までで充分である。
【００２２】
Ｓｂ2Ｏ3成分はガラス熔融時の脱泡のために添加しうるが、その量は１％までで十分である。
【００２３】
モールドプレス用光学ガラスとして不適当な成分であるＰｂＯ、Ｆ2等を含有しないことが好ましい。
【００２４】
【発明の実施の形態】
以下に、本発明の実施例について述べるが、本発明はこれら実施例に限定されるものではない。
【００２５】
表１〜３に、本発明の光学ガラスの実施例（Ｎｏ．１〜１３）及び比較例（Ａ）の組成を示し、各実施例、比較例で得られたガラスの屈折率（ｎd）、アッベ数（νd）、転移点（Ｔｇ）、及び屈伏点（Ａｔ）を示した。
【００２６】
実施例Ｎｏ．１〜１３、及び比較例Ａは、いずれも酸化物、リン酸塩、炭酸塩及び硝酸塩などの通常の光学ガラス原料を表に示した各組成比になるように所定の割合で秤量混合した後、白金坩堝などに投入し、１１００〜１３００℃の温度で２〜５時間熔融し、撹拌均質化した後、適当な温度に下げて金型等に鋳込み徐冷した。実施例Ｎｏ．１〜１３については、無色透明なガラスが得られたが、比較例Ａの組成では、ガラス化せず乳白化し、不透明なセラミックス状のものとなった。
【００２７】
【表１】
【表２】
【表３】
転移点（Ｔｇ）及び屈伏点（Ａｔ）は、長さ５０ｍｍ、直径４ｍｍの試料を毎分４℃の一定速度で昇温加熱しつつ、試料の伸びと温度を測定して得られた熱膨張曲線から求めた。
【００３１】
表１〜３に見られる通り、本発明の実施例のガラスはいずれも屈折率（ｎd）が１．８８〜１．９３及びアッベ数（νd）が１８〜２３の範囲内にあり、転移点（Ｔｇ）が４８０〜５８０℃、屈伏点（Ａｔ）が５３０〜６００℃の範囲内にあり、精密モールドプレス成形用に好適であり、かつ耐失透性が良好であるため、滴下法による精密モールドプレス成形用プリフォーム製造にも好適である。
【００３２】
一方、比較例のガラス組成は、耐失透性に難があるため、光学ガラス用途には適していない。
【００３３】
【発明の効果】
以上述べた通り、本発明の光学ガラスは、屈折率（ｎd）が１．８８以上及びアッベ数（νd）が２３以下の範囲の光学定数を有する光学ガラスであって、転移点（Ｔｇ）が４８０〜５８０℃の範囲内にあり、精密モールドプレス成形用に好適である。
【００３４】
また、本発明の光学ガラスは、近年急速に需要が増大している光通信用レンズに好適である。光通信用レンズは半導体レーザなどの発光体から放出されるレーザ光を光ファイバーに高効率で結合させるなどの働きをするガラスレンズで、光通信用部材には欠かせない微小光学部品である。このレンズにはボールレンズや非球面レンズなどが用いられるが、その特性として高屈折率であることが求められる。特に、本発明の光学ガラスは、非球面レンズとして使用する場合の精密モールドプレス成形に適している。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical glass having an optical constant having a refractive index (n d ) of 1.88 or more and an Abbe number (ν d ) of 23 or less, which is suitable for precision mold press molding.
[0002]
[Prior art]
Conventionally, optical glasses in the high refractive index region are typically composed of a composition containing a large amount of lead oxide, stable due to high devitrification resistance, and low in glass transition point (Tg). It has been used for molding. For example, JP-A-1-308843 discloses an optical glass for precision mold presses containing a large amount of lead oxide.
[0003]
However, since the environment for precision mold press molding is maintained in a reducing atmosphere to prevent oxidation of the mold, if lead oxide is contained in the glass component, reduced lead is deposited from the glass surface. However, it adheres to the mold surface, and there is a problem that the precise surface of the mold cannot be maintained. Further, lead oxide is harmful to the environment, and it has been desired to make it free.
[0004]
JP-A-8-157231 discloses an optical glass which does not contain lead oxide and has a low yield point. However, the refractive index (nd) of the optical glass disclosed herein is in the range of 1.70 to 1.77 (first aspect) and 1.77 to 1.85 (second aspect).
[0005]
Japanese Patent Application Laid-Open No. 2001-58845 discloses an optical glass that does not contain lead oxide, has a refractive index (nd) of 1.83 or more, and has a yield point of 550 ° C. or less. However, a high refractive index composition having a refractive index (n d ) of 1.88 or more tends to be milky without vitrification.
[0006]
[Problems to be solved by the invention]
The present invention improves the various disadvantages found in the conventional optical glass, has an optical constant in the range of refractive index (n d ) of 1.88 or more, Abbe number (ν d ) of 23 or less, and glass transition point. An object is to provide an optical glass having a low (Tg) and suitable for precision mold press molding.
[0007]
[Means for Solving the Problems]
As a result of intensive studies and studies to solve the above problems, the present inventor has obtained optical constants in which the refractive index (n d ) is in the range of 1.88 to 1.93 and the Abbe number (ν d ) is in the range of 18 to 23. And an optical glass that has a glass transition point (Tg) in the range of 480 to 580 ° C., does not contain environmentally undesirable substances, and has extremely good precision mold pressability, and has led to the present invention. It is.
[0008]
That is, in order to achieve the above object, the invention described in claim 1 is an optical glass having an optical constant having a refractive index (n d ) of 1.88 or more and an Abbe number (ν d ) of 23 or less. In mass%
B 2 O 3 0-10%
P 2 O 5 10~30%
Bi 2 O 3 10-25%
TiO 2 0.5-10%
Nb 2 O 5 30-50%
WO 3 0~ 2%
RO 0-10%
However, R is one or more of Ca, Ba, Zn and Li 2 O 0-6%
Na 2 O 5-15%
The optical glass is characterized in that it contains each component in the range of and the transition point (Tg) is in the range of 480 to 580 ° C.
[0009]
The optical glass of the present invention has a high refractive index and high dispersion, and a low transition point (Tg) in the range of 480 to 580 ° C. The optical glass of the present invention more preferably has a transition point (Tg) of 500 to 580 ° C.
[0010]
The reason why the composition range of each component constituting the optical glass of the present invention is limited as described above will be described below. Each component is expressed in mass%.
[0011]
The B 2 O 3 component is an effective component for improving the devitrification resistance and lowering the Tg. However, when the amount exceeds 10%, the devitrification resistance is deteriorated. Therefore, it is limited to the range of 0 to 10%. More preferably, it is in the range of 0 to 8%, and particularly preferably in the range of 2 to 6%.
[0012]
The P 2 O 5 component is an essential component that acts as a glass-forming oxide and is an effective component for improving devitrification resistance. However, if its amount is less than 10%, its effect is insufficient, and exceeds 30%. And the refractive index (nd) of the present invention cannot be satisfied. Therefore, it is limited to the range of 10 to 30%. More preferably, it is in the range of 10% or more and less than 25%, and particularly preferably in the range of 12% or more and less than 24%.
[0013]
The Bi 2 O 3 component is an essential component that is very important for increasing the refractive index of the glass while lowering the Tg. However, if the amount is less than 5%, the effect is insufficient, and if it exceeds 25%, the devitrification resistance deteriorates. Therefore, it is limited to a range of 5 to 25%. More preferably, it is in the range of more than 10% and 24% or less, and particularly preferably in the range of 12 to 20%.
[0014]
The GeO 2 component can be added to increase the refractive index of the glass, but since the raw material is very expensive, it is preferably 0% or more and less than 6%, more preferably 0% or more and less than 4%, and more preferably 0% or more and 2%. Less than% is particularly preferred.
[0015]
The TiO 2 component is a very important essential component for increasing the refractive index (nd). However, if its amount is less than 0.5%, the effect is small, and if it exceeds 10%, the devitrification resistance deteriorates. Therefore, it is limited to the range of 0.5 to 10%. More preferably, it is in the range of 2 to 10%, particularly preferably in the range of 4 to 8%.
[0016]
The Nb 2 O 5 component is a very important essential component in order to satisfy the target refractive index, but when the amount is less than 30%, no effect is seen, and when it exceeds 50%, the devitrification resistance deteriorates. . Therefore, it is limited to the range of 30 to 50%. More preferably, it is in the range of 32 to 50%, particularly preferably in the range of 34 to 48%.
[0017]
The WO 3 component has the effect of increasing the refractive index (nd) and improving the devitrification resistance. However, when the amount exceeds 10%, the devitrification resistance is adversely affected. Therefore, it is limited to the range of 0 to 10%. More preferably, it is in the range of 0 to less than 10%, particularly preferably in the range of 0 to 8%.
[0018]
RO components (R = Ca, Ba, Zn) are effective in improving devitrification resistance and lowering Tg, but if their amount exceeds 10%, devitrification resistance and chemical durability are adversely affected. . Therefore, it is limited to the range of 0 to 10%. More preferably, it is in the range of 0 to less than 10%, particularly preferably in the range of 0.5 to 8%.
[0019]
The Li 2 O component is an effective component for greatly reducing Tg, but when it exceeds 6%, the devitrification resistance is drastically lowered. Therefore, it is limited to a range of 0 to 6%. More preferably, it is in the range of 0% or more and less than 6%, and particularly preferably in the range of 0.5 to 4%.
[0020]
The Na 2 O component is an essential component effective for stabilizing the glass while lowering the Tg. However, if its amount is less than 5%, the effect is insufficient, and if it exceeds 15%, devitrification resistance is reversed. Becomes worse. Therefore, it is limited to a range of 5 to 15%. More preferably, it is in the range of more than 5% and less than 15%, particularly preferably in the range of more than 7% and less than 12%.
[0021]
Similarly to the Na 2 O component, the K 2 O component can be added to stabilize the glass while lowering the Tg, but up to 6% is sufficient.
[0022]
The Sb 2 O 3 component can be added for defoaming during glass melting, but the amount is sufficient up to 1%.
[0023]
It is preferable not to contain PbO, F 2, etc., which are unsuitable components as optical glass for mold presses.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Examples of the present invention will be described below, but the present invention is not limited to these examples.
[0025]
Tables 1 to 3 show the compositions of Examples (Nos. 1 to 13) and Comparative Examples (A) of the optical glass of the present invention, and the refractive indexes (n d ) of the glasses obtained in the Examples and Comparative Examples. , Abbe number (ν d ), transition point (Tg), and yield point (At).
[0026]
Example No. In Examples 1 to 13 and Comparative Example A, after ordinary optical glass materials such as oxides, phosphates, carbonates and nitrates are weighed and mixed at a predetermined ratio so as to have the respective composition ratios shown in the table Then, it was put into a platinum crucible, etc., melted at a temperature of 1100 to 1300 ° C. for 2 to 5 hours, stirred and homogenized, then cooled to an appropriate temperature and cast into a mold or the like and gradually cooled. Example No. About 1-13, the colorless and transparent glass was obtained, but in the composition of the comparative example A, it became milky white without vitrification, and it became an opaque ceramic-like thing.
[0027]
[Table 1]
[Table 2]
[Table 3]
The transition point (Tg) and yield point (At) were obtained by measuring the elongation and temperature of a sample having a length of 50 mm and a diameter of 4 mm while heating at a constant rate of 4 ° C. per minute. Obtained from the curve.
[0031]
As can be seen from Tables 1 to 3, all the glasses of the examples of the present invention have a refractive index (n d ) of 1.88 to 1.93 and an Abbe number (ν d ) of 18 to 23, Since the transition point (Tg) is in the range of 480 to 580 ° C. and the yield point (At) is in the range of 530 to 600 ° C., it is suitable for precision mold press molding and has good devitrification resistance. It is also suitable for manufacturing a preform for precision mold press molding.
[0032]
On the other hand, since the glass composition of a comparative example has difficulty in devitrification resistance, it is not suitable for an optical glass use.
[0033]
【The invention's effect】
As described above, the optical glass of the present invention is an optical glass having an optical constant having a refractive index (n d ) of 1.88 or more and an Abbe number (ν d ) of 23 or less, and having a transition point (Tg ) Is in the range of 480 to 580 ° C., and is suitable for precision mold press molding.
[0034]
The optical glass of the present invention is suitable for optical communication lenses, for which demand is rapidly increasing in recent years. An optical communication lens is a glass lens that functions to couple a laser beam emitted from a light emitter such as a semiconductor laser to an optical fiber with high efficiency, and is a micro optical component indispensable for an optical communication member. As this lens, a ball lens, an aspherical lens, or the like is used, and its characteristic is required to have a high refractive index. In particular, the optical glass of the present invention is suitable for precision mold press molding when used as an aspheric lens.
Claims (1)
Ｂ2Ｏ3 ０〜１０％
Ｐ2Ｏ5 １０〜３０％
Ｂｉ2Ｏ3 ５〜２５％
ＴｉＯ2 ０．５〜１０％
Ｎｂ2Ｏ5 ３０〜５０％
ＷＯ3 ０〜２％
ＲＯ ０〜１０％
ただし、ＲはＣａ、Ｂａ、Ｚｎのうちの１種以上
Ｌｉ2Ｏ ０〜６％
Ｎａ2Ｏ ５〜１５％
の範囲の各成分を含有し、転移点（Ｔｇ）が４８０〜５８０℃の範囲にあることを特徴とする光学ガラス。An optical glass having an optical constant having a refractive index (n d ) of 1.88 or more and an Abbe number (ν d ) of 23 or less, in mass%,
B 2 O 3 0-10%
P 2 O 5 10~30%
Bi 2 O 3 5-25%
TiO 2 0.5-10%
Nb 2 O 5 30-50%
WO 3 0~ 2%
RO 0-10%
However, R is one or more of Ca, Ba, Zn and Li 2 O 0-6%
Na 2 O 5-15%
An optical glass characterized by containing each component in the range of 5 and a transition point (Tg) in the range of 480 to 580 ° C.
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| JP2002099809A JP4059695B2 (en) | 2002-04-02 | 2002-04-02 | Optical glass |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2002099809A JP4059695B2 (en) | 2002-04-02 | 2002-04-02 | Optical glass |
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| JP2003300751A JP2003300751A (en) | 2003-10-21 |
| JP4059695B2 true JP4059695B2 (en) | 2008-03-12 |
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Cited By (1)
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| US8575834B2 (en) | 2009-10-15 | 2013-11-05 | Asahi Glass Company, Limited | Glass for diffusion layer in organic LED element, and organic LED element utilizing same |
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