JPH01230450A - Coating glass for optical fiber - Google Patents
Coating glass for optical fiberInfo
- Publication number
- JPH01230450A JPH01230450A JP63057070A JP5707088A JPH01230450A JP H01230450 A JPH01230450 A JP H01230450A JP 63057070 A JP63057070 A JP 63057070A JP 5707088 A JP5707088 A JP 5707088A JP H01230450 A JPH01230450 A JP H01230450A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- chemical durability
- viscosity
- pbo
- component
- 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.)
- Pending
Links
- 239000011521 glass Substances 0.000 title claims abstract description 55
- 239000013307 optical fiber Substances 0.000 title claims description 13
- 239000011248 coating agent Substances 0.000 title description 8
- 238000000576 coating method Methods 0.000 title description 8
- 101100296545 Caenorhabditis elegans pbo-6 gene Proteins 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 22
- 239000000203 mixture Substances 0.000 abstract description 9
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 8
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 abstract description 6
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 abstract description 5
- 229910052681 coesite Inorganic materials 0.000 abstract description 4
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 4
- 239000000377 silicon dioxide Substances 0.000 abstract description 4
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 4
- 229910052682 stishovite Inorganic materials 0.000 abstract description 4
- 229910052905 tridymite Inorganic materials 0.000 abstract description 4
- 229910011255 B2O3 Inorganic materials 0.000 abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052593 corundum Inorganic materials 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 abstract description 2
- GOLCXWYRSKYTSP-UHFFFAOYSA-N Arsenious Acid Chemical compound O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 abstract 4
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Inorganic materials O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 abstract 2
- YEAUATLBSVJFOY-UHFFFAOYSA-N tetraantimony hexaoxide Chemical compound O1[Sb](O2)O[Sb]3O[Sb]1O[Sb]2O3 YEAUATLBSVJFOY-UHFFFAOYSA-N 0.000 abstract 2
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Inorganic materials [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 abstract 1
- 239000011162 core material Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 8
- 239000000835 fiber Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 238000004031 devitrification Methods 0.000 description 4
- 238000002845 discoloration Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000005304 optical glass Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- -1 5n02 Inorganic materials 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical group 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000006025 fining agent Substances 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910001512 metal fluoride Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003346 selenoethers Chemical class 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000011282 treatment Methods 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
- C03C13/00—Fibre or filament compositions
- C03C13/04—Fibre optics, e.g. core and clad fibre compositions
- C03C13/045—Silica-containing oxide glass compositions
- C03C13/046—Multicomponent glass compositions
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (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)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Glass Compositions (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、光通信用、内視鏡用、ファクシミリ用および
像伝達用等のファイバーの構成材料である被覆用ガラス
に関し、とくに低粘性で化学的耐久性に優れた新規な光
学ファイバー用被覆ガラスに関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a coating glass that is a constituent material of fibers for optical communication, endoscopes, facsimiles, image transmission, etc. This invention relates to a novel coated glass for optical fibers with excellent chemical durability.
［従来技術］
一般に、Ｌ記用途に用いられるガラスファイバーは、２
重構造を有し、フリンｌ−ｅ重フリント笠の光学ガラス
を芯材とし、その周囲にそれよりも小さい屈折率を有す
るＳ Ｉ０２−Ｐ ｂｏ−に２０系やＳ ｉ ０２−Ｂ
２０３−Ｎａ２０系′９の光学ガラスを被覆材として設
けて成るもので、ファイハ−の一端から芯に入射させた
光情報を芯と被覆とのガラス境界面の全反射を利用して
芯内に閉じ込め、ファイバーの他端に伝えようとするも
のである。[Prior Art] Generally, glass fibers used for purposes listed below are 2
It has a heavy structure, and the optical glass of the flint shade is used as the core material, and the surrounding area has a smaller refractive index, such as 20 series or Si 02-B.
203-Na20 series '9 optical glass is provided as a coating material, and optical information incident on the core from one end of the fifer is transferred into the core using total reflection at the glass interface between the core and the coating. It is intended to confine the signal and transmit it to the other end of the fiber.
この種のガラスファイバー用被覆材料に要求される一般
的特性として、下記事項か挙げられる。The following are general characteristics required of this type of glass fiber coating material.
（１）化学的耐久性が良好であること。この点不良であ
ると芯ガラスとの境界面が変質し、ファイバーの光伝送
損失や機械的強度の劣化を招く。(1) Good chemical durability. If this point is defective, the interface with the core glass will change in quality, leading to optical transmission loss and deterioration of the mechanical strength of the fiber.
（２）光伝送能力の向」−のため、開口数（ＮＡ）に関
与する芯ガラスとの屈折率差が大きいこと。(2) Because of its optical transmission ability, there is a large difference in refractive index with the core glass, which is related to the numerical aperture (NA).
（３）成形性を良くするため、成形温度域での芯ガラス
との粘度差が小さいこと。すなわち、リトルＩ・ン軟化
温度の差で１５０°Ｃ以内であること。(3) In order to improve moldability, the viscosity difference with the core glass in the molding temperature range must be small. In other words, the difference in the softening temperature of Little I and N should be within 150°C.
（４）成形後のストレスによる光伝送損失や機械的強度
劣化の防（にのため、芯ガラスとの熱膨張係数の差が小
さく、約２０（αＸ１０〜７０ｍ／Ｃｍ′Ｃ（ａｔｌ
Ｏ０〜３００°Ｃ））以下であること。(4) To prevent optical transmission loss and mechanical strength deterioration due to stress after molding, the difference in thermal expansion coefficient with the core glass is small, approximately 20 (αX10-70m/Cm'C (atl
0~300°C)) or less.
（５）ファイバー成形温度域で失透しないこと。(5) No devitrification in the fiber forming temperature range.
ところで、近年、光学ガラスファイバーの用途が拡大す
るにつれ、ファイバー製造−１−の各種薬品処理や使用
環境等の条件か厳しくなり、とくに被覆ガラスに対して
はさらに一段と優れた化学的耐久性の向上か要望されて
いる。このため種々の芯ガラスに対する被覆ガラスか開
発されてきており、例えば特公昭５８−１２２１３号公
報等には、化学的耐久性の改善を試みたＳｉＯ２−Ａ
Ｉ２０３−Ｒ２０（Ｒはアルカリ金属）系のガラスも開
示されている。しかし、これらは芯ガラスを含めいずれ
も粘性が高いため、ガラスの溶融やファイバーの成形条
件か不利である。そこで、これを改善するため低粘性芯
ガラスを採用しようとしてもこれに適合し、１−記要望
を満たす被覆ガラスは未だ得難い状況にある。By the way, in recent years, as the uses of optical glass fibers have expanded, the conditions for fiber manufacturing (1), such as various chemical treatments and usage environments, have become stricter, and in particular, it is necessary to improve chemical durability even further for coated glass. or requested. For this reason, coating glasses for various core glasses have been developed; for example, in Japanese Patent Publication No. 12213/1983, SiO2-A, which attempts to improve chemical durability, has been developed.
Glasses based on I203-R20 (R is an alkali metal) are also disclosed. However, since all of these materials, including the core glass, have high viscosity, they are disadvantageous in terms of glass melting and fiber molding conditions. Therefore, even if a low viscosity core glass is used to improve this problem, it is still difficult to obtain a coated glass that is compatible with this and satisfies requirements 1-1.
［発明が解決しようとする問題点］
本発明は」−記の状況に鑑みてなされたもので、その目
的とするところは被覆ガラスとしての一般的特性を維持
しつつ、化学的耐久性が一段と優れ、かつ低粘性芯ガラ
スに対する適合性、すなわちその粘性かりトルトン軟化
温度で示して６８０°Ｃ以下であり、また屈折率（ｎｄ
）が約１．５４以下、熱膨張係数（α）が約７５〜１２
０である光学ファイバー用被覆ガラスを提供することに
ある。[Problems to be Solved by the Invention] The present invention has been made in view of the circumstances described in ``-'', and its purpose is to improve the chemical durability while maintaining the general characteristics of coated glass. It has excellent compatibility with low-viscosity core glasses, that is, its viscosity is below 680°C in terms of Tolton softening temperature, and its refractive index (nd
) is approximately 1.54 or less, and the coefficient of thermal expansion (α) is approximately 75 to 12.
It is an object of the present invention to provide a coated glass for optical fibers having a temperature of 0.
［問題を解決するだめの手段］
本発明者らは、上記目的を達成するため種々の試験研究
を重ねた結果、５ｊ０２−Ｎａ２０および／またはに２
０系ガラスにおいて、必須成分として特定範囲量のＰｂ
ＯおよびＬｉ２Ｏを含有させることにより意外にも化学
的耐久性が一段と優れ、かつ所望の粘性を有する光学フ
ァイバー用被覆ガラスをみいだし、本発明をなすに至っ
た。[Means for Solving the Problem] As a result of various test and research studies to achieve the above object, the present inventors have found that 5j02-Na20 and/or Ni2
0 series glass contains a specific range of Pb as an essential component.
By incorporating O and Li2O, a coated glass for optical fibers which has unexpectedly improved chemical durability and a desired viscosity has been discovered, and the present invention has been completed.
すなわち、本発明にかかる光学ファイバー用被覆ガラス
の特徴は、重量％で。That is, the characteristics of the coated glass for optical fiber according to the present invention are expressed in weight percent.
ＳｉＯ２ ６０〜７４％、Ｂ２Ｏ３０〜
ｌＯ％、
Ａｌ２Ｏ３Ｑ〜 ８％、
ＣａＯ＋ＭｇＯ０〜１２％、
ＰｂＯ３〜１５％、
ＺｎＯ０〜１０％、
ただしＰｂＯ＋ＺｎＯ６〜１５％、
ＢａＯ＋Ｓｒ０ ０〜 ５％、Ｌｉ２
Ｏ０，２〜７％、
Ｎ ａ２０＋に２０ ５−２０％、Ａｓ２
０３ ＋Ｓｂ２ ０３ ０〜 １％およびＦ
Ｏ〜 ５％
を含有させたところにある。SiO2 60~74%, B2O30~
1O%, Al2O3Q ~ 8%, CaO + MgO 0 ~ 12%, PbO3 ~ 15%, ZnO 0 ~ 10%, however, PbO + ZnO 6 ~ 15%, BaO + Sr0 0 ~ 5%, Li2
O0, 2-7%, Na20+ 20 5-20%, As2
03 +Sb2 03 0~1% and F
It is at the point where it contains 0 to 5%.
つぎに、本発明の光学ファイバー用被覆ガラスに関し、
各成分の組成範囲を」１記のとおり限定した理由を述べ
る。Next, regarding the coated glass for optical fibers of the present invention,
The reason why the composition range of each component was limited as described in 1. is explained below.
ＳｉＯ２成分は、ガラスの化学的耐久性および機械的強
度を付与するために必要な成分であるが、その量が６０
％未満では化学的耐久性が悪化し、７４％を超えると所
望の粘性を得難くなる。The SiO2 component is a necessary component to impart chemical durability and mechanical strength to glass, but its amount is 60%
If it is less than 74%, chemical durability will deteriorate, and if it exceeds 74%, it will be difficult to obtain the desired viscosity.
Ｂ２Ｏ３成分は、ガラスの溶融性を改善する効果がある
が、その量が１０％を超えると化学的耐久性が悪化する
。Ａｌ２Ｏ３成分は、ガラスの化学的耐久性および機械
的強度を改善するのに有効であるか、その量が８％を超
えると所望の粘性を得難くなる。なお、」１記効果を顕
著に与えるためにほ０．５％以］−が好ましい。ＣａＯ
およびＭｇＯの各成分は、ガラスの溶融性、化学的耐久
性および機械的強度を改善するのに有効であるが、それ
らの１種または２種の合に１量が１２％を超えると屈折
率が高くなり、失透し易くなる。ＰｂＯ成分は、本発明
における最も重要な成分の−っであり、Ｓ ｉ ０２−
Ｎａ２０および／またほに２０系ガラスにＬ１０２成分
と共に特定範囲の量を含有させると、煮外にも化学的耐
久性が大幅に向上するとともに、低粘性芯ガラスに適合
する粘性および熱膨張係数か４４７られることをみいだ
されたものである。これらの効果を所望の屈折率を維持
しっつり、えるためには、ＰｂＯ成分の量は３〜１５％
の範囲、好ましくは６〜１３％の範囲とする。The B2O3 component has the effect of improving the meltability of glass, but if its amount exceeds 10%, chemical durability deteriorates. The Al2O3 component is effective in improving the chemical durability and mechanical strength of the glass, but if its amount exceeds 8%, it becomes difficult to obtain the desired viscosity. Incidentally, it is preferable that the amount is about 0.5% or more in order to significantly provide the effect described in item 1. CaO
Each component of MgO and MgO is effective in improving the meltability, chemical durability, and mechanical strength of glass, but if the amount of one or both of them exceeds 12%, the refractive index becomes high and becomes susceptible to devitrification. The PbO component is the most important component in the present invention, and is the most important component in the present invention.
When Na20 and/or Honi20 series glass contains a specific range of L102 components, its chemical durability even after boiling is greatly improved, and the viscosity and thermal expansion coefficient are suitable for low-viscosity core glass. 447. In order to achieve these effects while maintaining the desired refractive index, the amount of PbO component should be 3 to 15%.
, preferably in the range of 6 to 13%.
ＺｎＯ成分は、ガラスの化学的耐久性を向」ニさせるの
に有効であるが、その量が１０％を超えると失透を生し
易くなる。また、ＰｂＯおよびＺｎＯ成分の合λ１量が
６％未満では化学的削欠性改善の効果が薄れ、１５％を
越えるとガラスの屈折率が高くなる。ＢａＯおよびＳｒ
Ｏ成分は、ガラスの化学的耐久性を改善するのに有効で
あるが、それらの１種または２種の合計量は、所望の屈
折率を維持させるため５％まで、好ましくは３％までと
する。Ｌｉ２Ｏ成分は、本発明におけるもう一つの重要
な成分であり、化学的耐久性を損なうことなくガラスを
低粘性にし、芯ガラスとの成形性を向上させる効果があ
る。これらの効果を耐失透性を維持させつつ顕著に与え
るためには、Ｌｉ２Ｏ成分の量は０２％〜７％の範囲、
好ましくは１〜６％の範囲とする。Ｎａ２Ｏおよびに２
０成分は、ガラスの溶融性の向上、低粘性化および熱膨
張係数の調整のために有効であるが、それらの１種また
は２種の合計量が５％未満では効果が十分でなく、また
２０％を超えるとガラスの化学的耐久性が態化する。Ａ
ｓ２Ｏ３および５ｂ２ｏ３成分は、ガラスの溶融の際の
清澄剤として添加するが、それらの１種または２種の合
計量は１％までで十分である。Ｆ成分は、ガラスの溶融
性および粘性の改善のために効果があるが、上記各金属
酸化物の１種または２種以上と置換した金属弗化物のＦ
としての合語量が５％を越えるとガラスの失透傾向が増
大する。The ZnO component is effective in improving the chemical durability of glass, but if its amount exceeds 10%, devitrification tends to occur. Furthermore, if the total amount λ1 of PbO and ZnO components is less than 6%, the effect of improving chemical cuttability will be weakened, and if it exceeds 15%, the refractive index of the glass will increase. BaO and Sr
O components are effective in improving the chemical durability of glass, but the total amount of one or both of them is up to 5%, preferably up to 3%, in order to maintain the desired refractive index. do. The Li2O component is another important component in the present invention, and has the effect of making the glass low in viscosity and improving the moldability with the core glass without impairing chemical durability. In order to significantly provide these effects while maintaining devitrification resistance, the amount of Li2O component should be in the range of 0.2% to 7%,
Preferably it is in the range of 1 to 6%. Na2O and Ni2
Component 0 is effective for improving the meltability of glass, reducing viscosity, and adjusting the coefficient of thermal expansion. However, if the total amount of one or both of them is less than 5%, the effect is not sufficient, and If it exceeds 20%, the chemical durability of the glass deteriorates. A
The s2O3 and 5b2o3 components are added as fining agents during glass melting, and it is sufficient that the total amount of one or both of them is up to 1%. The F component is effective for improving the melting properties and viscosity of glass, but the F component is a metal fluoride substituted with one or more of the above metal oxides.
If the amount of the compound exceeds 5%, the tendency of the glass to devitrify increases.
さらに、本発明のガラスは、上記成分のほかにＴｉＯ２
、Ｙ２０３ 、Ｌａ２０３ 、Ｇｄ２０３、Ｎｂ２０５
、’Ｔａ２０５ 、Ｂｉ２０３ 、ＷＯ３、Ｐ２０５
、ＧｅＯ２，５ｎ０２ 、Ｆｅ２０３等の金属耐化物
およびそれらの金属元素の硫化物、セレン化物を、本発
明の被覆ガラスとしての特性を損なわない範囲で、１種
または２種以上の合計量で約５％まで含有きせ得る。Furthermore, the glass of the present invention contains TiO2 in addition to the above components.
, Y203, La203, Gd203, Nb205
, 'Ta205, Bi203, WO3, P205
, GeO2, 5n02, Fe203, etc., and sulfides and selenides of these metal elements, in a total amount of about 5. It can contain up to %.
［実施例］
つぎに、本発明にかかる光学ファイバー用被覆ガラスの
好適な実施組成例（Ｎｏ、ｌ−１０）および前記従来の
５ｉＯ２−Ｐｂｏ−に２ｏ系およびＳ ｉ ０２−Ａ
Ｉ２０３−Ｒ２０系ガラスの比較ｉ＋１ｉｎ（Ｎｏ、Ａ
およびＢ）を、これらのガラスの熱膨張係数、軟化温度
、屈折率および耐候性についての試験測定結果とともに
、表１に示す。[Example] Next, a preferred composition example (No. 1-10) of the coated glass for optical fiber according to the present invention and the conventional 5iO2-Pbo-, 2o-based and S i 02-A
Comparison of I203-R20 series glass i+1in (No, A
and B) are shown in Table 1, along with the test measurement results for the thermal expansion coefficient, softening temperature, refractive index, and weather resistance of these glasses.
ここで、熱膨張係数は１００°Ｃ〜３００℃の温度域の
平均値であり、また、軟化温度はリトルトン法で測定し
て得た値である。また、屈折率は６０°プリズムを作製
し分光計で測定したｄ線の値である。Here, the thermal expansion coefficient is an average value in a temperature range of 100° C. to 300° C., and the softening temperature is a value obtained by measurement by the Littleton method. Moreover, the refractive index is the value of the d-line measured with a spectrometer after producing a 60° prism.
耐候性は、約１ｍ＋ｅφのファイバーに加工した試料を
、温度９０℃、湿度９７％以上の条件にした恒温恒湿器
中で１８時間処理後常温に戻し、さらに、」１記条件で
１８時間保持した後、試料表面を顕微鏡で観察し、ヤケ
の程度に応じてっぎの３段階に分類する方法で表示した
。Weather resistance was determined by processing a sample processed into a fiber of approximately 1 m + eφ in a constant temperature and humidity chamber with a temperature of 90°C and a humidity of 97% or more for 18 hours, returning it to room temperature, and then holding it for 18 hours under the conditions described in 1. After that, the sample surface was observed under a microscope and classified into three grades according to the degree of discoloration.
■ は全くヤケの認められないもの
ＩＩ は僅かにヤケの認められるもの■ は全体にヤ
ケの認められるもの
表１から明らかなとおり、本発明の実施組成例のガラス
は、従来の組成例Ｎｏ、Ａと比較すると、耐候性が一段
と優れており、また、従来の組成例Ｎｏ、ＡおよびＮｏ
、Ｈに比べ軟化温度が５９０〜６５０°Ｃの範囲にあっ
て、粘性が著しく改善されており、低粘性芯ガラスに適
合した所期の特性を有している。しかも、屈折率および
熱膨張係数も所望の数値を示している。したがって、本
発明の被覆ガラスを光学ファイ／へ−の構成材料として
用いることにより、化学的耐久性および光伝送能力に優
れた光学ファイバーか得られる。■ indicates no discoloration at all II indicates slight discoloration ■ indicates discoloration is observed throughout As is clear from Table 1, the glass of the composition example of the present invention is the conventional composition example No. Compared to A, the weather resistance is even better, and conventional composition examples No., A, and No.
, H has a softening temperature in the range of 590 to 650°C, has significantly improved viscosity, and has the desired characteristics suitable for low-viscosity core glass. Moreover, the refractive index and thermal expansion coefficient also show desired values. Therefore, by using the coated glass of the present invention as a constituent material of an optical fiber, an optical fiber having excellent chemical durability and light transmission ability can be obtained.
本発明の上記実施組成例のガラスは、いずれも、酸化物
、硝酸塩、炭酸塩および弗化物等の原ｔ１を混合し、こ
れを白金るつぼ等の通常の溶融装置を用いて、組成によ
る難易度に応して約１３００〜１４５０°Ｃの温度で溶
融し攪拌均質化した後、所望の形状に成形し冷却するこ
とにより容易に得ることかできる。これらのガラスを被
覆材とし、晶屈折率低粘性ガラスを芯材として、２重る
つぼ方式あるいはロフト イン、チューブ方式等により
紡糸成形して、容易に光学ファイバーを製造しイ１１る
。All of the glasses of the above-mentioned composition examples of the present invention are produced by mixing raw materials t1 such as oxides, nitrates, carbonates, and fluorides, and melting the mixture using a normal melting device such as a platinum crucible. It can be easily obtained by melting at a temperature of about 1,300 to 1,450°C, stirring and homogenizing depending on the situation, and then molding into a desired shape and cooling. Using these glasses as a coating material and a low-viscosity glass with a crystalline refractive index as a core material, optical fibers can be easily manufactured by spinning and molding using a double crucible method, a loft-in method, a tube method, or the like.
［発明の効果］
一］−述のとおり、本発明にかかる光学ファイバー用被
覆ガラスは、ＳｉＯ２−Ｐｂ０〜Ｌｉ２０〜Ｎａ２Ｏお
よび／またはに２０系ガラスであるから、所望の屈折率
と膨張係数を維持しつつ、化学的耐久性に優れ、かつ低
粘性芯ガラスに適合した軟化温度を有している。したが
って、化学的耐久性に優れ、かつ光伝送能力の優れた所
期の光学ファイバー用被覆材料として有用である。[Effects of the Invention] 1] - As mentioned above, since the coated glass for optical fiber according to the present invention is SiO2-Pb0~Li20~Na2O and/or 20-based glass, it maintains the desired refractive index and expansion coefficient. However, it has excellent chemical durability and a softening temperature suitable for low-viscosity core glass. Therefore, it is useful as a coating material for optical fibers that has excellent chemical durability and optical transmission ability.
Claims (1)
ス。 ２、重量％で、 Ａｌ＿２Ｏ＿３０．５〜８％、 ＰｂＯ６〜１３％、 ＢａＯ＋ＳｒＯ０〜３％ およびＬｉ＿２Ｏ１〜６％ であることを特徴とする特許請求の範囲第１項記載の光
学ファイバー用被覆ガラス。[Claims] 1. In weight%, SiO_260-74%, B_2O_30-10%, Al_2O_30-8%, CaO+MgO0-12%, PbO3-15%, ZnO0-10%, with the exception of PbO+ZnO6-15%, BaO+SrO0- 5%, Li_2O0.2-7%, Na_2O+K_2O_5-20%, As_2O_3+Sb_2O_30-1% and F0-5%. 2. The coated glass for optical fibers according to claim 1, characterized in that, in weight percent, the following are: Al_2O_30.5 to 8%, PbO6 to 13%, BaO+SrO0 to 3%, and Li_2O 1 to 6%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63057070A JPH01230450A (en) | 1988-03-10 | 1988-03-10 | Coating glass for optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63057070A JPH01230450A (en) | 1988-03-10 | 1988-03-10 | Coating glass for optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01230450A true JPH01230450A (en) | 1989-09-13 |
Family
ID=13045189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63057070A Pending JPH01230450A (en) | 1988-03-10 | 1988-03-10 | Coating glass for optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01230450A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0312341A (en) * | 1989-06-12 | 1991-01-21 | Hoya Corp | Clad glass for optical fiber |
-
1988
- 1988-03-10 JP JP63057070A patent/JPH01230450A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0312341A (en) * | 1989-06-12 | 1991-01-21 | Hoya Corp | Clad glass for optical fiber |
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