JPH08175841A - Optical glass - Google Patents
Optical glassInfo
- Publication number
- JPH08175841A JPH08175841A JP33728394A JP33728394A JPH08175841A JP H08175841 A JPH08175841 A JP H08175841A JP 33728394 A JP33728394 A JP 33728394A JP 33728394 A JP33728394 A JP 33728394A JP H08175841 A JPH08175841 A JP H08175841A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- bao
- devitrification
- total amount
- optical glass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- 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
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、屈折率（ｎｄ）が１．
７１〜１．８３、アッベ数（νｄ）が２２〜３２の範囲
の光学恒数を有し、かつ、転移温度（Ｔｇ）が５８０℃
以下であるモールドプレス成形に適した新規な光学ガラ
スに関する。The present invention has a refractive index (nd) of 1.
71 to 1.83, the Abbe number (νd) has an optical constant in the range of 22 to 32, and the transition temperature (Tg) is 580 ° C.
The following relates to a novel optical glass suitable for mold press molding.
【０００２】[0002]
【従来の技術】近年、軟化させたゴブ（ガラス塊）をプ
レス成形して光学素子を直接作るモールドプレス技術が
盛んに開発されるようになり、低い転移温度（以下、Ｔ
ｇという）と優れた化学的耐久性を有する低Ｔｇ光学ガ
ラスの需要が強まってきた。屈折率（ｎｄ）１．７１〜
１．８３、アッベ数（νｄ）２２〜３２の範囲の光学恒
数を有するガラスは、従来からＳｉＯ2−ＰｂＯ系ガラ
スとして種々知られているが、ＰｂＯを含有したものは
プレス成形時に金型との融着が起こりやすい。また、特
開昭５５−１２６５４９号公報には弗素成分を含有した
ガラスが示されているが、このガラスは高温でのプレス
成形時に弗素成分が揮発し金型表面に曇りを生じさせる
ため、いずれもモールドプレス用のガラスとしては不適
当である。さらに、特開昭４８−３４９１３号公報、特
開昭４８−６５２１１号公報、特開昭５２−２５８１２
号公報および特開昭５２−４５６１２号公報等により、
ＳｉＯ2−ＴｉＯ2−Ｎｂ2Ｏ5−ＲＯおよび／またはＲ’
2Ｏ系（ただし、Ｒは二価金属、Ｒ’はアルカリ金属）
のガラスが知られているが、これらのガラスは耐失透性
に劣り、ゴブ成形時やプレス成形時に失透が発生しやす
く、これらの諸欠点を総合的に満足し得るガラス組成は
未だ見いだされていない。2. Description of the Related Art In recent years, mold press technology for directly forming an optical element by press-molding a softened gob (glass lump) has been actively developed, and a low transition temperature (hereinafter referred to as T
The demand for low Tg optical glass having excellent chemical durability (hereinafter referred to as “g”) has increased. Refractive index (nd) 1.71-
Various glasses having an optical constant in the range of 1.83 and Abbe number (νd) of 22 to 32 have been conventionally known as SiO 2 -PbO-based glasses, but those containing PbO are metal molds during press molding. It is easy to fuse with. Further, Japanese Patent Application Laid-Open No. 55-126549 discloses a glass containing a fluorine component. However, since the fluorine component volatilizes during press molding at a high temperature to cause clouding on the surface of the mold, this glass is not suitable. Is also unsuitable as glass for mold pressing. Furthermore, JP-A-48-34913, JP-A-48-65211, and JP-A-52-25812.
Japanese Patent Publication No. 52-45612 and the like,
SiO 2 -TiO 2 -Nb 2 O 5 -RO and / or R '
2 O system (however, R is a divalent metal and R'is an alkali metal)
However, the glass composition is inferior in devitrification resistance, devitrification is likely to occur during gob molding or press molding, and a glass composition that can comprehensively satisfy these various defects has not yet been found. It is not.
【０００３】[0003]
【発明が解決しようとする課題】本発明は前記従来のガ
ラスにみられる諸欠点を改善し、屈折率（ｎｄ）１．７
１〜１．８３、アッベ数（νｄ）２２〜３２の範囲の光
学恒数と優れた化学的耐久性および低温軟化性を維持し
つつ、一段と優れた耐失透性を有する光学ガラスを提供
することにある。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional glass and has a refractive index (nd) of 1.7.
Provided is an optical glass having more excellent devitrification resistance while maintaining an optical constant in the range of 1 to 1.83 and an Abbe number (νd) of 22 to 32, excellent chemical durability and low temperature softening property. Especially.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に本発明者は、鋭意試験研究を重ねた結果、従来には具
体的に開示されていない特定範囲のＳｉＯ2−ＴｉＯ2−
Ｎｂ2Ｏ5−ＷＯ3−ＢａＯ−Ｎａ2Ｏおよび／またはＫ2
Ｏ系ガラスにおいて、前記光学恒数と低温軟化性を維持
しつつ、化学的耐久性を損なうことなく、一段と優れた
耐失透性を有することを見いだし、本発明を成すに至っ
た。In order to achieve the above object, the present inventor has conducted extensive studies as a result, and as a result, has found that SiO 2 --TiO 2
Nb 2 O 5 -WO 3 -BaO- Na 2 O and / or K 2
The inventors have found that the O-based glass has more excellent devitrification resistance without impairing the chemical durability while maintaining the optical constant and the low-temperature softening property, and has completed the present invention.
【０００５】本発明にかかる光学ガラスの特徴は、重量
％で、ＳｉＯ2 １５〜３５％、Ｂ2Ｏ3
０〜１０％、ＴｉＯ2 １５〜３５％、Ｎｂ2Ｏ
5 １０〜４０％、Ｔａ2Ｏ5 ０〜１０
％、ＷＯ3 ０．１〜１２％、ＺｎＯ
０〜１０％、ＳｒＯ ０〜１２％、ＢａＯ
０．１〜１４％、ただし、ＺｎＯ＋ＳｒＯ＋ＢａＯ
の合計量 ０．１〜１４％、Ｎａ2Ｏ ５〜２
０％、Ｋ2Ｏ ０〜２０％、ただし、Ｎａ2Ｏ
＋Ｋ2Ｏの合計量 １０〜３０％、Ｓｂ2Ｏ3 ０
〜 １％、の範囲の各成分から成り、かつ、屈折率（ｎ
ｄ）１．７１〜１．８３、アッベ数（νｄ）２２〜３２
の範囲の光学恒数とＴｇが５８０℃以下であることにあ
る。The characteristics of the optical glass according to the present invention are as follows: SiO 2 15 to 35% by weight, B 2 O 3
0-10%, TiO 2 15-35%, Nb 2 O
5 10-40%, Ta 2 O 5 0-10
%, WO 3 0.1-12%, ZnO
0-10%, SrO 0-12%, BaO
0.1 to 14%, ZnO + SrO + BaO
Total amount of 0.1-14%, Na 2 O 5-2
0%, K 2 O 0~20% , however, Na 2 O
+ K 2 O total amount 10 to 30%, Sb 2 O 3 0
˜1%, each of which has a refractive index (n
d) 1.71-1.83, Abbe number (νd) 22-32
The optical constant and Tg within the range of 580 ° C. or less.
【０００６】上記のとおり、各成分の組成範囲を限定し
た理由は次のとおりである。すなわち、ガラス形成成分
であるＳｉＯ2成分はガラス化学的耐久性および目標の
光学恒数維持のため１５〜３５％の範囲とする。As described above, the reasons for limiting the composition range of each component are as follows. That is, the SiO 2 component, which is a glass-forming component, is in the range of 15 to 35% for maintaining the chemical durability of glass and maintaining the target optical constant.
【０００７】ＴｉＯ2、Ｎｂ2Ｏ5成分は本発明のガラス
の光学恒数の調整のため必要であり、溶融性を悪化させ
ずに化学的耐久性を向上させる効果がある。また、Ｔｉ
Ｏ2、Ｎｂ2Ｏ5成分を共存させることによりガラス化範
囲を広くしガラスをより安定にする。しかし、これらの
効果を得るためには、ＴｉＯ2、Ｎｂ2Ｏ5成分はそれぞ
れ１５％および１０％以上必要であり、ＴｉＯ2および
Ｎｂ2Ｏ5の量がそれぞれ３５％および４０％を超えると
ガラスはかえって失透しやすくなる。また、さらに安定
なガラスを得るためにはＮｂ2Ｏ5成分を１５〜４０％の
範囲にすることが好ましい。The TiO 2 and Nb 2 O 5 components are necessary for adjusting the optical constants of the glass of the present invention, and have the effect of improving the chemical durability without deteriorating the meltability. Also, Ti
Coexistence of O 2 and Nb 2 O 5 components widens the vitrification range and makes the glass more stable. However, in order to obtain these effects, the TiO 2 and Nb 2 O 5 components must be 15% and 10% or more, respectively, and if the amounts of TiO 2 and Nb 2 O 5 exceed 35% and 40%, respectively. On the contrary, glass tends to devitrify. Further, in order to obtain a more stable glass, it is preferable to set the Nb 2 O 5 component in the range of 15 to 40%.
【０００８】ＷＯ3成分は本発明のガラスにおいて、前
記光学恒数と低温軟化性を維持しつつ、化学的耐久性を
損なうことなく、一段と優れた耐失透性を有することを
見いだした重要な成分である。しかし、この成果を得る
ためには次の二つの条件を満たす必要がある。一つはＢ
ａＯ成分と共存させること。もう一つはＷＯ3成分を
０．１％以上、好ましくは０．５％以上含有させること
である。ただし、ＷＯ3成分が１２％を超えるとガラス
はかえって失透しやすくなる。It is important to find that the WO 3 component has a further excellent devitrification resistance in the glass of the present invention, while maintaining the optical constant and the low temperature softening property, without impairing the chemical durability. It is an ingredient. However, in order to achieve this result, the following two conditions must be met. One is B
Coexist with aO component. The other is to contain the WO 3 component in an amount of 0.1% or more, preferably 0.5% or more. However, if the WO 3 component exceeds 12%, the glass tends to devitrify rather.
【０００９】ＢａＯ成分はガラスの溶融性を向上させる
うえ、前記のとおりＷＯ3成分と共存させることにより
耐失透性を向上させるが、これらの効果を得るためには
０．１％以上必要であり、１４％を超えるガラスはかえ
って失透しやすくなるばかりか、化学的耐久性が劣化し
てしまう。好ましくは０．１〜１２％の範囲とする。The BaO component improves the meltability of the glass and improves the devitrification resistance by coexisting with the WO 3 component as described above, but 0.1% or more is necessary to obtain these effects. However, if the glass content exceeds 14%, devitrification tends to occur, and the chemical durability of the glass deteriorates. The range is preferably 0.1 to 12%.
【００１０】Ｎａ2Ｏ、Ｋ2Ｏ成分は溶融性および耐失透
性を向上させる効果がある。Ｎａ2Ｏ成分が５％未満で
はその効果が得られず、Ｋ2Ｏ成分は任意に添加しその
効果を得ることができるが、Ｎａ2Ｏ、Ｋ2Ｏを共存させ
ることにより耐失透性をより向上させる事ができるた
め、Ｋ2Ｏ成分は０．５％以上が好ましい。ただし、Ｎ
ａ2Ｏ、Ｋ2Ｏ成分の量がそれぞれ２０％を超えるとガラ
スはかえって失透しやすくなる。また、Ｔｇが５８０℃
以下を維持するためには、Ｎａ2Ｏ成分の量または二成
分の合計量を１０％以上にする必要があり、化学的耐久
性の維持のためにＮａ2Ｏ、Ｋ2Ｏ成分の合計量を３０％
以下にする必要がある。また、さらに安定なガラスを得
るためにはＮａ2Ｏ、Ｋ2Ｏを共存させ、二成分の合計量
を１６〜３０％の範囲にすることが好ましい。The Na 2 O and K 2 O components have the effect of improving the meltability and devitrification resistance. If the Na 2 O component is less than 5%, the effect cannot be obtained, and the K 2 O component can be arbitrarily added to obtain the effect. However, by coexisting Na 2 O and K 2 O, devitrification resistance can be improved. Therefore, the K 2 O component is preferably 0.5% or more. However, N
If the amounts of a 2 O and K 2 O components exceed 20%, the glass tends to devitrify. Also, Tg is 580 ° C
In order to maintain the following, the amount of Na 2 O component or the total amount of two components must be 10% or more, and the total amount of Na 2 O and K 2 O components must be maintained in order to maintain chemical durability. 30%
Must be: Further, in order to obtain a more stable glass, it is preferable to make Na 2 O and K 2 O coexist and set the total amount of the two components in the range of 16 to 30%.
【００１１】Ｂ2Ｏ3成分はＳｉＯ2成分と同様にガラス
網目構造を構成しガラスを安定化させるうえ、溶融性を
向上させる効果があるため任意に添加し得るが、光学恒
数および化学的耐久性維持のため１０％まで含有させる
ことができる。光学恒数維持のため好ましくは５％以下
にすべきである。Like the SiO 2 component, the B 2 O 3 component has a glass network structure to stabilize the glass and has the effect of improving the meltability, so it can be added arbitrarily. Up to 10% can be contained to maintain durability. To maintain the optical constant, it should preferably be 5% or less.
【００１２】Ｔａ2Ｏ5成分は光学恒数調整のため任意に
添加し得るが、その量は１０％以下で十分である。The Ta 2 O 5 component can be optionally added for adjusting the optical constant, but the amount thereof is 10% or less.
【００１３】ＺｎＯおよびＳｒＯ成分は光学定数調整と
溶融性向上のためＢａＯ成分の一部と置換し任意に含有
し得るが、それぞれ１０％および１２％を超えると耐失
透性が悪化する。化学的耐久性維持のためＺｎＯ、Ｓｒ
Ｏ成分の一種とＢａＯ成分の合計量および／または二種
とＢａＯ成分の合計量を１２％以下にする必要がある。The ZnO and SrO components may be optionally contained by substituting a part of the BaO component for the purpose of adjusting the optical constants and improving the meltability, but if they exceed 10% and 12%, respectively, the devitrification resistance deteriorates. ZnO, Sr for maintaining chemical durability
It is necessary that the total amount of one O component and BaO component and / or the total amount of two O components and BaO component be 12% or less.
【００１４】Ｓｂ2Ｏ3成分はガラス溶融の際の清澄剤と
して任意に含有し得るが、その量は１％以下で十分であ
る。The Sb 2 O 3 component may be optionally contained as a fining agent at the time of melting the glass, but the amount thereof is 1% or less.
【００１５】なお、本発明のガラスに上記以外の成分、
例えばＢｉ2Ｏ3、およびＳｎＯ等の成分を合計２％程度
まで、光学恒数の調整、脱泡性の向上、ガラスの溶解性
および失透性の改善のため必要に応じ添加しても差しつ
かえない。The glass of the present invention contains components other than those described above,
For example, components such as Bi 2 O 3 and SnO may be added up to a total of about 2%, if necessary, in order to adjust the optical constant, improve the defoaming property, and improve the glass solubility and devitrification. can not use.
【００１６】[0016]
【実施例】次に、本発明の光学ガラスにかかる実施組成
例（Ｎｏ．１〜Ｎｏ．１０）および前記従来の光学ガラ
スの比較組成例（Ｎｏ．Ａ〜Ｎｏ．Ｃ）についてそれぞ
れ得られたガラスの屈折率（ｎｄ）、アッベ数（ν
ｄ）、Ｔｇおよび失透試験の測定結果とともに表１に示
した。EXAMPLES Next, examples of compositions (No. 1 to No. 10) of the optical glass of the present invention and examples of comparison compositions (No. A to No. C) of the conventional optical glass were obtained. Refractive index (nd) of glass, Abbe number (ν
The results are shown in Table 1 together with the measurement results of d), Tg, and devitrification test.
【００１７】失透試験Ａはガラス成形時に発生する失透
を対象とした試験であり、白金製の５０ｃｃポットにガ
ラス試料８０ｇを入れて、電気炉中で各ガラスの溶融性
の難易度に応じて、各試料を１１００〜１３００℃の温
度で２時間溶融した後、降温して各試料を１０５０℃、
１０００℃および９５０℃で２時間保温した後、炉外に
取り出して失透の有無を顕微鏡により観察したもので、
その結果、失透が認められないガラスは○印で、また失
透が認められたガラスは×印で示した。The devitrification test A is a test for devitrification that occurs during glass forming. 80 g of a glass sample is placed in a 50 cc pot made of platinum, and the glass is heated in an electric furnace according to the degree of meltability of each glass. Then, each sample was melted at a temperature of 1100 to 1300 ° C. for 2 hours and then cooled to 1050 ° C.
After keeping the temperature at 1000 ° C and 950 ° C for 2 hours, it was taken out of the furnace and observed for devitrification with a microscope.
As a result, the glass in which no devitrification was observed was indicated by a circle, and the glass in which devitrification was observed was indicated by a cross.
【００１８】失透試験Ｂはモールドプレス時に発生する
失透を対象とした試験であり、作製した各ガラスを２０
×２０×２０ｍｍのブロック状に切り出し、凹型の耐火
物製皿にのせ、電気炉中でモールドプレス温度の近傍で
あるＴｇ＋１００℃で３０分保温した後、降温し炉外に
取り出し、得られた各ガラスの上下２面を研磨し、ガラ
ス内部の失透の有無を顕微鏡により観察したもので、そ
の結果、失透が認められないガラスは○印で、また失透
が認められたガラスは×印で示した。The devitrification test B is a test for devitrification that occurs during mold pressing.
Each piece was cut out into a block of × 20 × 20 mm, placed on a concave refractory dish, kept at Tg + 100 ° C. near the mold press temperature for 30 minutes in an electric furnace, then cooled and taken out of the furnace. The upper and lower surfaces of the glass were polished, and the presence or absence of devitrification inside the glass was observed with a microscope. As a result, the glass with no devitrification was marked with a circle, and the glass with devitrification was marked with an x. Indicated by.
【００１９】[0019]
【表１】 [Table 1]
【表１】 [Table 1]
【表１】 [Table 1]
【表１】 [Table 1]
【００２０】表１に見られるとおり、本発明の実施例の
ガラスはいずれも優れた化学的耐久性を維持しつつ、所
定の光学定数とＴｇとを有している。また、これらのガ
ラスはいずれも失透性に優れ、また均質化しやすい。こ
のため前記実施例のガラスは製造が容易であり、モール
ドプレス用素材として適している。なお、本発明の表１
記載の実施組成例のガラスは、いずれも酸化物、炭酸塩
および硝酸塩等の通常の光学ガラス原料を用いて所定の
割合で秤量混合した後白金坩堝に投入し、組成による溶
融の難易度に応じて１０００〜１３００℃の温度で２〜
４時間溶融し、攪拌均質化した後適当な温度に下げて金
型等に鋳込み除冷することにより容易に得ることができ
る。As can be seen from Table 1, all the glasses of the examples of the present invention have a predetermined optical constant and Tg while maintaining excellent chemical durability. Further, all of these glasses have excellent devitrification and are easily homogenized. Therefore, the glass of the above-mentioned embodiment is easy to manufacture and is suitable as a material for mold pressing. In addition, Table 1 of the present invention
The glasses of the embodiment composition examples described are all oxides, carbonates, nitrates and the like, which are weighed and mixed at a predetermined ratio using ordinary optical glass raw materials and then charged into a platinum crucible, depending on the difficulty of melting depending on the composition. 2 at a temperature of 1000-1300 ° C
It can be easily obtained by melting for 4 hours, homogenizing with stirring, lowering to an appropriate temperature, casting in a mold or the like, and cooling.
【００２１】[0021]
【発明の効果】以上述べたとおり、本発明の光学ガラス
はＳｉＯ2−ＴｉＯ2−Ｎｂ2Ｏ5−ＷＯ3−ＢａＯ−Ｎａ2
Ｏおよび／またはＫ2Ｏ系ガラスの特定組成を有するも
のであるから、屈折率（ｎｄ）が１．７１〜１．８３、
アッベ数（νｄ）が２２〜３２の範囲の光学恒数と５８
０℃以下のＴｇを有し、耐失透性に一段と優れている。
また製造が容易であり均質化しやすく、モールドプレス
用ガラスに適している。As described above, the optical glass of the present invention is made of SiO 2 —TiO 2 —Nb 2 O 5 —WO 3 —BaO—Na 2
Since it has a specific composition of O and / or K 2 O based glass, it has a refractive index (nd) of 1.71 to 1.83,
Abbe number (νd) is in the range of 22 to 32 and the optical constant is 58.
It has a Tg of 0 ° C or less and is further excellent in devitrification resistance.
Also, it is easy to manufacture and easy to homogenize, and is suitable for glass for mold pressing.
Claims (2)
％、Ｂ2Ｏ3 ０〜１０％、ＴｉＯ2 １
５〜３５％、Ｎｂ2Ｏ5 １０〜４０％、Ｔａ2Ｏ5
０〜１０％、ＷＯ3 ０．１〜１２％、
ＺｎＯ ０〜１０％、ＳｒＯ ０〜
１２％、ＢａＯ ０．１〜１４％、ただし、Ｚｎ
Ｏ＋ＳｒＯ＋ＢａＯの合計量 ０．１〜１４％、Ｎａ2
Ｏ ５〜２０％、Ｋ2Ｏ ０〜２０
％、ただし、Ｎａ2Ｏ＋Ｋ2Ｏの合計量 １０〜３０％、
Ｓｂ2Ｏ3 ０〜 １％、の範囲の各成分から成
り、かつ、屈折率（ｎｄ）１．７１〜１．８３、アッベ
数（νｄ）２２〜３２の範囲の光学恒数を有することを
特徴とする光学ガラス。1. SiO 2 15-35 by weight%.
%, B 2 O 3 0 to 10%, TiO 2 1
5 to 35%, Nb 2 O 5 10 to 40%, Ta 2 O 5
0-10%, WO 3 0.1-12%,
ZnO 0-10%, SrO 0
12%, BaO 0.1 to 14%, Zn
Total amount of O + SrO + BaO 0.1-14%, Na 2
O 5-20%, K 2 O 0-20
%, But the total amount of Na 2 O + K 2 O is 10 to 30%,
Sb 2 O 3 0 to 1%, and each of them has an optical constant in the range of refractive index (nd) 1.71 to 1.83 and Abbe number (νd) 22 to 32. Characteristic optical glass.
％、Ｂ2Ｏ3 ０〜 ５％、ＴｉＯ2 １
５〜３５％、Ｎｂ2Ｏ5 １５〜４０％、Ｔａ2Ｏ5
０〜１０％、ＷＯ3 ０．５〜１２％、
ＺｎＯ ０〜１０％、ＳｒＯ ０〜
１２％、ＢａＯ ０．１〜１２％、ただし、Ｚｎ
Ｏ＋ＳｒＯ＋ＢａＯの合計量 ０．１〜１２％、Ｎａ2
Ｏ ５〜２０％、Ｋ2Ｏ ０．５〜２０
％、ただし、Ｎａ2Ｏ＋Ｋ2Ｏの合計量 １６〜３０％、
Ｓｂ2Ｏ3 ０〜 １％、の範囲の各成分から成
り、かつ、転移温度（Ｔｇ）が５８０℃以下であること
を特徴とする請求項１に記載の光学ガラス。2. SiO 2 15-35 by weight%.
%, B 2 O 3 0 to 5%, TiO 2 1
5 to 35%, Nb 2 O 5 15 to 40%, Ta 2 O 5
0-10%, WO 3 0.5-12%,
ZnO 0-10%, SrO 0
12%, BaO 0.1 to 12%, Zn
O + SrO + BaO total amount 0.1-12%, Na 2
O 5~20%, K 2 O 0.5~20
%, But the total amount of Na 2 O + K 2 O is 16 to 30%,
The optical glass according to claim 1, which comprises each component in the range of Sb 2 O 3 0 to 1% and has a transition temperature (Tg) of 580 ° C. or lower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33728394A JP3765594B2 (en) | 1994-12-26 | 1994-12-26 | Optical glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33728394A JP3765594B2 (en) | 1994-12-26 | 1994-12-26 | Optical glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08175841A true JPH08175841A (en) | 1996-07-09 |
| JP3765594B2 JP3765594B2 (en) | 2006-04-12 |
Family
ID=18307160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33728394A Expired - Fee Related JP3765594B2 (en) | 1994-12-26 | 1994-12-26 | Optical glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3765594B2 (en) |
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