JP4169622B2 - Optical glass - Google Patents
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- JP4169622B2 JP4169622B2 JP2003093282A JP2003093282A JP4169622B2 JP 4169622 B2 JP4169622 B2 JP 4169622B2 JP 2003093282 A JP2003093282 A JP 2003093282A JP 2003093282 A JP2003093282 A JP 2003093282A JP 4169622 B2 JP4169622 B2 JP 4169622B2
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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２２〜２８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】
特開昭５２−４５６１２号公報には酸化鉛を含有しないＳｉＯ2−Ｎｂ2Ｏ5−ＲＯ−Ｒ2Ｏ系の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１．６１〜１．８０の範囲である。
【０００５】
特開２０００−１６８３０号公報には酸化鉛を含有せず、屈折率（ｎｄ）が１．７以上であり、屈伏点が５８０℃以下の光学ガラスが開示されている。しかし実施例には屈折率（ｎｄ）が１．８８以上の光学ガラスは具体的には示されていない。
【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以上の高屈折率領域の光学ガラスであって、アッベ数（νd）が２２〜２８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２２〜２８の範囲の光学定数を有するガラスにおいて、ガラス転移点（Ｔｇ）が５００〜５８０℃、屈伏点（Ａｔ）が５５０〜６４０℃の範囲にあること、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が得られることを見いだし、本発明に至ったものである。
【０００８】
すなわち、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２２〜２８の範囲の光学定数を有する光学ガラスであって、質量％で、
ＳｉＯ2 １５〜２５％
Ｂ2Ｏ3 ０〜５％
Ｌａ2Ｏ3 ０〜５％
ＴｉＯ2 ５〜１５％
ＺｒＯ2 ０〜１０％
Ｎｂ2Ｏ5 ３０〜５０％
ＷＯ3 ０〜５％
ＣａＯ ０〜１０％
ＢａＯ ０〜１０％
Ｌｉ2Ｏ ３〜１２％
Ｎａ2Ｏ ０〜１０％
Ｋ2Ｏ ０〜１０％
Ｂｉ2Ｏ3 ０〜１５％
の範囲の各成分を含有し、ガラス転移点（Ｔｇ）が５００〜５８０℃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、屈折率（ｎd）が１．８８以上及びアッベ数（νd）が２２〜２８の範囲の光学定数を有すると共に、低いガラス転移点（Ｔｇ）を有する。本発明の光学ガラスは、好ましくはガラス転移点（Ｔｇ）５００〜５８０℃を有する。この範囲のガラス転移点を有することにより、本発明の光学ガラスは精密モールドプレス性が極めて良好である。また、同様の理由で、本発明の光学ガラスは、好ましくは屈伏点（Ａｔ）５５０〜６４０℃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。尚、本明細書にて「実質的に含まない」という記載は、意識的にその成分を添加しないが、不純物として含まれるものは許容されるということを意味するものである。
【００１１】
ＳｉＯ2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１５％未満ではその効果が不十分であり、２５％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、１５〜２５％の範囲に限定される。より好ましくは１６〜２４％の範囲にあり、特に好ましくは１８〜２２％の範囲にある。
【００１２】
ＧｅＯ2成分は耐失透性の向上に有効な成分であり添加しうるが、非常に高価な成分であるため、０〜５％の範囲が好ましい。より好ましくは０〜４％の範囲にあり、特に好ましくは０〜２％の範囲にある。
【００１３】
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５％を超えると逆に耐失透性が悪くなる。従って、０〜５％の範囲に限定される。より好ましくは０〜４％の範囲にあり、特に好ましくは０．５〜２％の範囲にある。
【００１４】
Ｌａ2Ｏ3成分はガラスの屈折率を高めつつ、低分散化させるのに有効な成分である。また、本組成系においてＢ2Ｏ3成分と混在させることで耐失透性にも有効である。しかし、その量が５％を超えると逆に耐失透性が悪くなる。従って、０〜５％の範囲に限定される。より好ましくは０〜４％の範囲にある。
【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５％未満では効果が小さく、１５％を超えると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８〜１４％の範囲にあり、特に好ましくは１０〜１３％の範囲にある。
【００１６】
ＺｒＯ2成分は屈折率（ｎｄ）を高め、化学的耐久性を高めるために有効な成分であるが、その量が１０％を超えると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２〜８％の範囲にある。
【００１７】
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％未満では効果が不十分であり、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３０％を越えて５０％未満の範囲にあり、特に好ましくは３２〜４８％の範囲にある。
【００１８】
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５％を超えると逆に耐失透性が悪くなる。従って、０〜５％の範囲に限定される。より好ましくは０〜４％の範囲にあり、特に好ましくは０〜３％の範囲にある。
【００１９】
ＣａＯ成分は耐失透性の向上、光学定数の調整に効果があるが、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０〜８％の範囲にあり、特に好ましくは実質的に含まないことが好ましい。
【００２０】
ＢａＯ成分は耐失透性の向上、光学定数の調整に効果があるが、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０〜８％の範囲にあり、特に好ましくは１〜６％の範囲にある。ＣａＯ成分及びＢａＯ成分の和は、耐失透性の向上及び光学定数の調整の為に、０〜１２％の範囲が好ましく、０．５〜１０％の範囲がより好ましく、１〜８％の範囲が特に好ましい。
【００２１】
Ｌｉ2Ｏ成分はＴｇを大幅に下げるのに有効な必須成分であるが、３％未満ではその効果が不十分であり、１２％を超えると耐失透性が急激に低下する。従って、３〜１２％の範囲に限定される。より好ましくは４〜１１％の範囲にあり、特に好ましくは５〜１０％の範囲にある。
【００２２】
Ｎａ2Ｏ成分はＴｇを下げつつ、混合アルカリ効果により化学的耐久性を高めるために有効な成分であるが、その量が１０％を超えると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０〜６％の範囲にある。
【００２３】
Ｋ2Ｏ成分はＴｇを下げつつ、混合アルカリ効果により化学的耐久性を高めるために有効な成分であるが、その量が１０％を超えると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０〜６％の範囲にある。Ｌｉ2Ｏ成分、Ｎａ2Ｏ成分及びＫ2Ｏ成分の和は、３〜３２％の範囲が好ましく、４〜２４％の範囲がより好ましく、６〜１６％の範囲が特に好ましい。
【００２４】
Ｂｉ2Ｏ3は高屈折率を維持しつつ、Ｔｇを低下させる効果のある成分であるが、その量が１５％を超えると耐失透性が悪くなる。従って、０〜１５％の範囲に限定される。より好ましくは０〜１２％の範囲にあり、特に好ましくは実質的に含まないことが好ましい。
【００２５】
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。
【００２６】
本発明の光学ガラスにおいては、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。
【００２７】
【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。
【００２８】
表１〜３に、本発明の光学ガラスの実施例（Ｎｏ．１〜１３）の組成を示し、各実施例で得られたガラスの屈折率（ｎd）、アッベ数（νd）、ガラス転移点（Ｔｇ）、及び屈伏点（Ａｔ）を示した。
【００２９】
実施例Ｎｏ．１〜１３は、いずれも酸化物、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。
【００３０】
【表１】
【表２】
【表３】
ガラス転移点（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。
【００３４】
【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２２〜２８の範囲の光学定数を有する光学ガラスであって、ガラス転移点（Ｔｇ）が５００〜５８０℃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。耐失透性が良好であるため、特に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。
【００３５】
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 22 to 28, and 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]
Japanese Patent Application Laid-Open No. 52-45612 discloses a SiO 2 —Nb 2 O 5 —RO—R 2 O-based optical glass containing no lead oxide. However, the refractive index (nd) of the optical glass disclosed herein is in the range of 1.61-1.80.
[0005]
Japanese Unexamined Patent Publication No. 2000-16830 discloses an optical glass that does not contain lead oxide, has a refractive index (nd) of 1.7 or more, and has a yield point of 580 ° C. or less. However, the optical glass having a refractive index (nd) of 1.88 or more is not specifically shown in the examples.
[0006]
[Problems to be solved by the invention]
The present invention improves various disadvantages found in the conventional optical glass, and is an optical glass having a high refractive index region having a refractive index (n d ) of 1.88 or more, and an Abbe number (ν d ) of 22 to 28. It is an object of the present invention to provide an optical glass having an optical constant in the range of 5 and having a low glass transition point (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 the range of refractive index (n d ) of 1.88 to 1.93 and Abbe number (ν d ) of 22 to 28. The glass having a glass transition point (Tg) in the range of 500 to 580 ° C., a yield point (At) in the range of 550 to 640 ° C., and does not contain environmentally undesirable substances, and the precision mold pressability is extremely good. It has been found that an optical glass can be obtained, and has led to the present invention.
[0008]
That is, the invention described in claim 1 is an optical glass having an optical constant in which the refractive index (n d ) is 1.88 or more and the Abbe number (ν d ) is in the range of 22 to 28, and is in mass%.
SiO 2 15~25%
B 2 O 3 0~5%
La 2 O 3 0-5%
TiO 2 5-15%
ZrO 2 0-10%
Nb 2 O 5 30-50%
WO 3 0~5%
CaO 0-10%
BaO 0-10%
Li 2 O 3-12%
Na 2 O 0-10%
K 2 O 0-10%
Bi 2 O 3 0-15%
It is each optical glass characterized by having a glass transition point (Tg) in the range of 500 to 580 ° C.
[0009]
The optical glass of the present invention has an optical constant in the range of refractive index (n d ) of 1.88 or more and Abbe number (ν d ) in the range of 22 to 28, and also has a low glass transition point (Tg). The optical glass of the present invention preferably has a glass transition point (Tg) of 500 to 580 ° C. By having a glass transition point in this range, the optical glass of the present invention has extremely good precision mold pressability. For the same reason, the optical glass of the present invention preferably has a yield point (At) of 550 to 640 ° 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%. In the present specification, the description “substantially free” means that the component is not added consciously, but an impurity contained as an impurity is allowed.
[0011]
SiO 2 component is an essential component which acts as a glass forming oxide, is an effective ingredient for improving the devitrification resistance, the amount is insufficient, the effect is less than 15%, exceeding 25% present The objective refractive index (nd) cannot be satisfied. Therefore, it is limited to a range of 15 to 25%. More preferably, it is in the range of 16 to 24%, and particularly preferably in the range of 18 to 22%.
[0012]
The GeO 2 component is an effective component for improving devitrification resistance and can be added. However, since it is a very expensive component, the range of 0 to 5% is preferable. More preferably, it is in the range of 0 to 4%, particularly preferably in the range of 0 to 2%.
[0013]
The B 2 O 3 component is an effective component for improving the devitrification resistance and lowering the Tg. However, when the amount exceeds 5%, the devitrification resistance is deteriorated. Therefore, it is limited to a range of 0 to 5%. More preferably, it is in the range of 0 to 4%, and particularly preferably in the range of 0.5 to 2%.
[0014]
The La 2 O 3 component is an effective component for increasing the refractive index of the glass while reducing the dispersion. Moreover, it is effective also for devitrification resistance by mixing with the B 2 O 3 component in this composition system. However, when the amount exceeds 5%, the devitrification resistance is adversely affected. Therefore, it is limited to a range of 0 to 5%. More preferably, it is in the range of 0 to 4%.
[0015]
The TiO 2 component is a very important essential component for increasing the refractive index (nd). However, if its amount is less than 5%, the effect is small, and if it exceeds 15%, the devitrification resistance deteriorates. Therefore, it is limited to a range of 5 to 15%. More preferably, it is in the range of 8-14%, particularly preferably in the range of 10-13%.
[0016]
The ZrO 2 component is an effective component for increasing the refractive index (nd) and increasing the chemical durability. 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%, particularly preferably in the range of 2 to 8%.
[0017]
The Nb 2 O 5 component is a very important essential component in order to satisfy the target refractive index. However, if its amount is less than 30%, the effect is insufficient, and if it exceeds 50%, the devitrification resistance is poor. Become. Therefore, it is limited to the range of 30 to 50%. More preferably, it is in the range of more than 30% and less than 50%, particularly preferably in the range of 32 to 48%.
[0018]
The WO 3 component has the effect of increasing the refractive index (nd) and improving the devitrification resistance, but if the amount exceeds 5%, the devitrification resistance is adversely affected. Therefore, it is limited to a range of 0 to 5%. More preferably, it is in the range of 0 to 4%, particularly preferably in the range of 0 to 3%.
[0019]
The CaO component is effective in improving devitrification resistance and adjusting the optical constant. However, if the amount exceeds 10%, the 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 8%, and it is particularly preferable that it is not substantially contained.
[0020]
The BaO component is effective in improving devitrification resistance and adjusting the optical constant. However, if the amount exceeds 10%, the 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 8%, particularly preferably in the range of 1 to 6%. The sum of the CaO component and the BaO component is preferably in the range of 0 to 12%, more preferably in the range of 0.5 to 10%, and more preferably in the range of 1 to 8% for improving devitrification resistance and adjusting the optical constant. A range is particularly preferred.
[0021]
The Li 2 O component is an essential component effective for significantly lowering the Tg, but if it is less than 3%, its effect is insufficient, and if it exceeds 12%, the devitrification resistance decreases rapidly. Therefore, it is limited to the range of 3 to 12%. More preferably, it is in the range of 4 to 11%, particularly preferably in the range of 5 to 10%.
[0022]
The Na 2 O component is an effective component for increasing the chemical durability by the mixed alkali effect while 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%, particularly preferably in the range of 0 to 6%.
[0023]
The K 2 O component is an effective component for increasing the chemical durability by the mixed alkali effect while 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%, particularly preferably in the range of 0 to 6%. The sum of the Li 2 O component, Na 2 O component and K 2 O component is preferably in the range of 3 to 32%, more preferably in the range of 4 to 24%, and particularly preferably in the range of 6 to 16%.
[0024]
Bi 2 O 3 is a component having an effect of lowering Tg while maintaining a high refractive index, but when its amount exceeds 15%, devitrification resistance is deteriorated. Therefore, it is limited to a range of 0 to 15%. More preferably, it is in the range of 0 to 12%, and it is particularly preferable that it is not substantially contained.
[0025]
The Sb 2 O 3 component can be added for defoaming during glass melting, but the amount is sufficient up to 1%.
[0026]
In the optical glass of the present invention, it is preferable not to contain PbO, F 2, etc., which are components inappropriate as an optical glass for mold presses.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Examples of the present invention will be described below, but the present invention is not limited to these examples.
[0028]
Tables 1 to 3 show compositions of Examples (Nos. 1 to 13) of the optical glass of the present invention, and the refractive index (n d ), Abbe number (ν d ), and glass of the glass obtained in each Example. A transition point (Tg) and a yield point (At) are shown.
[0029]
Example No. Nos. 1 to 13 were prepared by weighing and mixing ordinary optical glass materials such as oxides, carbonates and nitrates at predetermined ratios so as to have the respective composition ratios shown in the table, and then putting them into a platinum crucible or the like. After melting at a temperature of ˜1300 ° C. for 2 to 5 hours and stirring and homogenizing, the mixture was lowered to an appropriate temperature and cast into a mold or the like and gradually cooled. Example No. For 1 to 13, colorless and transparent glass was obtained.
[0030]
[Table 1]
[Table 2]
[Table 3]
The glass 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 expansion curve.
[0034]
【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 22 to 28, and has a glass transition point. (Tg) is in the range of 500 to 580 ° C., which is suitable for precision mold press molding. Since the devitrification resistance is good, it is particularly suitable for producing a preform for precision mold press molding by a dropping method.
[0035]
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)
ＳｉＯ2 １５〜２５％
Ｂ2Ｏ3 ０〜５％
Ｌａ2Ｏ3 ０〜５％
ＴｉＯ2 ５〜１５％
ＺｒＯ2 ０〜１０％
Ｎｂ2Ｏ5 ３０〜５０％
ＷＯ3 ０〜５％
ＣａＯ ０〜１０％
ＢａＯ ０〜１０％
Ｌｉ2Ｏ ３〜１２％
Ｎａ2Ｏ ０〜１０％
Ｋ2Ｏ ０〜１０％
Ｂｉ2Ｏ3 ０〜１５％
の範囲の各成分を含有し、ガラス転移点（Ｔｇ）が５００〜５８０℃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 ) in the range of 22 to 28, in mass%,
SiO 2 15~25%
B 2 O 3 0-5%
La 2 O 3 0-5%
TiO 2 5-15%
ZrO 2 0-10%
Nb 2 O 5 30-50%
WO 3 0~5%
CaO 0-10%
BaO 0-10%
Li 2 O 3-12%
Na 2 O 0-10%
K 2 O 0-10%
Bi 2 O 3 0-15%
An optical glass containing each component in the range of 5 to 580 ° C. and having a glass transition point (Tg) in the range of 500 to 580 ° C.
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| JP2003093282A JP4169622B2 (en) | 2002-04-02 | 2003-03-31 | Optical glass |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2002099810 | 2002-04-02 | ||
| JP2002282336 | 2002-09-27 | ||
| JP2003093282A JP4169622B2 (en) | 2002-04-02 | 2003-03-31 | Optical glass |
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| JP4169622B2 true JP4169622B2 (en) | 2008-10-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5357429B2 (en) | 2008-01-31 | 2013-12-04 | Ｈｏｙａ株式会社 | Optical glass, glass material for press molding, optical element and method for producing the same, and method for producing optical element blank |
| JP5545917B2 (en) * | 2008-01-31 | 2014-07-09 | 株式会社オハラ | Optical glass |
| JP2010105902A (en) * | 2008-09-30 | 2010-05-13 | Ohara Inc | Optical glass and method for suppressing deterioration of spectral transmittance |
| JP5734587B2 (en) | 2009-07-29 | 2015-06-17 | Hoya株式会社 | Optical glass, precision press-molding preform, optical element and manufacturing method thereof, and imaging apparatus |
| JP2011037660A (en) * | 2009-08-07 | 2011-02-24 | Ohara Inc | Optical glass, lens preform and optical element |
| JP5731388B2 (en) * | 2009-08-07 | 2015-06-10 | 株式会社オハラ | Optical glass |
| JP5813926B2 (en) * | 2010-03-31 | 2015-11-17 | Hoya株式会社 | Optical glass, precision press-molding preform, optical element, manufacturing method thereof, and imaging apparatus |
| JP5794412B2 (en) * | 2011-01-26 | 2015-10-14 | 日本電気硝子株式会社 | Optical glass |
| 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 |
| JP6325189B2 (en) * | 2012-10-22 | 2018-05-16 | 株式会社オハラ | Optical glass |
| JP6067482B2 (en) * | 2013-05-24 | 2017-01-25 | Hoya株式会社 | Optical glass, glass material for press molding, optical element and method for producing the same, and method for producing optical element blank |
| CN106630594B (en) | 2016-09-05 | 2019-12-03 | 成都光明光电股份有限公司 | Optical glass and optical element |
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