JPS5915102B2 - Near infrared cut filter glass - Google Patents
Near infrared cut filter glassInfo
- Publication number
- JPS5915102B2 JPS5915102B2 JP2556979A JP2556979A JPS5915102B2 JP S5915102 B2 JPS5915102 B2 JP S5915102B2 JP 2556979 A JP2556979 A JP 2556979A JP 2556979 A JP2556979 A JP 2556979A JP S5915102 B2 JPS5915102 B2 JP S5915102B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- water resistance
- cut filter
- infrared cut
- filter 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.)
- Expired
Links
- 239000011521 glass Substances 0.000 title claims description 18
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 2
- 239000003086 colorant Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 238000010521 absorption reaction Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- -1 Cu+ ions Chemical class 0.000 description 6
- 238000002834 transmittance Methods 0.000 description 6
- 230000003595 spectral effect Effects 0.000 description 4
- 238000004040 coloring Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000005365 phosphate glass Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000006121 base glass Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000004031 devitrification Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000007614 solvation Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- C03C4/00—Compositions for glass with special properties
- C03C4/08—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths
- C03C4/082—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths for infrared absorbing glass
-
- 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
- C03C3/17—Silica-free oxide glass compositions containing phosphorus containing aluminium or beryllium
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】
この発明は単管カラーテレビカメラ用色調整フィルタ、
露出計のＣｄＳ補正フィルタ等に使用され、４００〜６
００ ｎｍを効率良く透過し、６００〜７００ ｎｍを
シャープカットする近赤外吸収ガラスに関する。[Detailed Description of the Invention] This invention provides a color adjustment filter for a single-tube color television camera;
Used in CdS correction filters of light meters, etc., 400-6
The present invention relates to a near-infrared absorbing glass that efficiently transmits 00 nm and sharply cuts 600 to 700 nm.
近赤外域を含めて６００〜７００ ｎｍを遮断する為に
は普通銅イオン着色が応用されている。Copper ion coloring is commonly applied to block 600 to 700 nm including the near-infrared region.
しかしこ−で問題となるのは、如何に４００ ｎｍの吸
収を最小限に抑え、６００〜７００ ｎｍでシャープカ
ットするかである。However, the problem here is how to minimize absorption at 400 nm and sharply cut at 600 to 700 nm.
又ベースガラスがリン酸ガラスである為耐水性が悪い点
も問題で、化学的耐久性を向上させることが望まれてい
る。Another problem is that the base glass is phosphate glass, so it has poor water resistance, so it is desired to improve its chemical durability.
銅イオンはガラス中でＣｕ ’ ： Ｃｕ＋の分配平衡
を形成しＣｕ＋イオンは無色であるが、Ｃｕ２＋イオン
には８００ ｎｍを中心とする吸収がある。Copper ions form a distribution equilibrium of Cu':Cu+ in glass, and Cu+ ions are colorless, but Cu2+ ions have absorption centered at 800 nm.
この着色効果はガラスの溶融雰囲気が酸化性である場合
にのみ得られる。This coloring effect can only be obtained if the glass melting atmosphere is oxidizing.
又Ｃｕ２＋イオンはガラス中で修飾酸化物の位置を占め
、多数の酸素イオンが配位されるとき青色を呈し、カッ
ト特性を所定にする。Also, Cu2+ ions occupy the positions of modified oxides in the glass, giving a blue color when coordinated with a large number of oxygen ions, and predetermining the cutting properties.
もしも非対称で分極性の強いイオンが共存するときには
、吸収は強化され緑色から褐色への範囲に着色を変化す
る。If asymmetric and strongly polarized ions coexist, absorption will be enhanced and the color will change from green to brown.
従ってＣｕ”＋イオのソルベージョン効果を高めるには
、同時に使用する修飾酸化物を吟味し、組成範囲を規定
するべきである。Therefore, in order to enhance the solvation effect of Cu''+ ions, the modified oxides to be used at the same time should be carefully examined and the composition range should be defined.
ベースガラスをリン酸ガラスにしている点に対しては、
ＺｎＯ，Ｃａ０ｔＢ２０３ 、’ｒｉｏ２ｙ ＺｒＯ２
を導入しているが耐水性を未だ満足にしていない。Regarding the point that the base glass is phosphate glass,
ZnO, Ca0tB203,'rio2y ZrO2
However, the water resistance is still not satisfactory.
この発明はこれ等の観点からなされたもので、ＳＯ３を
含有し限定された組成範囲で分光特性、耐水性等を改良
したものである。The present invention was made from these points of view, and is one that contains SO3 and improves spectral characteristics, water resistance, etc. within a limited composition range.
即ち重量％でＰ２Ｏ５５０〜８５％、Ａ１２０３２〜１
４％、Ｎａ２００〜５％、Ｋ２Ｏ０〜５％、Ｌ １２０
０〜５％、且つＮａ２Ｏ＋に２０＋Ｌｉ２０−２〜１０
％、ＢａＯ２〜３５％、Ｚｎ０Ｏ〜５％、ＭｇＯ１〜８
％、Ｃａ００〜５％、且つＺ ｎ Ｏ＋ＭｇＯ＋Ｃａ
Ｏ＝ ３〜１５％、Ｂ２０３０〜３％１．ＴｉＯ２０〜
３％、Ｚｎ００〜５％、５Ｏ３０，２〜１．０％及び着
色剤としてＣｕ００．５〜８％からなる近赤外カットフ
ィルタガラスにある。That is, P2O550-85% by weight, A12032-1
4%, Na200-5%, K2O0-5%, L 120
0-5%, and 20+Li20-2-10 in Na2O+
%, BaO2~35%, Zn0O~5%, MgO1~8
%, Ca00-5%, and ZnO+MgO+Ca
O=3-15%, B2030-3%1. TiO20～
3%, Zn00-5%, 5O30,2-1.0%, and Cu00.5-8% as a coloring agent.
この発明の近赤外カットフィルタガラスでＰ２Ｏ５は５
０％未満では４００ ｎｍでの透過率を減少し、８５％
を越えるとリン酸ガラスの化学的耐久性を劣化させる。In the near-infrared cut filter glass of this invention, P2O5 is 5
Below 0%, the transmittance at 400 nm decreases to 85%.
Exceeding this will deteriorate the chemical durability of phosphate glass.
Ａｌ２Ｏ３は耐水性を保つのに最低２％を必要とし、１
４％を越えると紫外域の透過率を減少して好ましくない
。Al2O3 requires a minimum of 2% to maintain water resistance, and 1
If it exceeds 4%, the transmittance in the ultraviolet region decreases, which is not preferable.
Ｎ ａ ２０、Ｋ２Ｏ、Ｌ ｔ ２０は耐水性を低下す
るものであるためにそれぞれ５％以下とし、合計量は２
％未満では６００〜７００ｎｍの吸収をシャープに出来
ず、１０％を越えると耐水性を低下する。Since N a 20, K2O, and L t 20 reduce water resistance, each should be 5% or less, and the total amount should be 2
If it is less than 10%, absorption at 600 to 700 nm cannot be sharpened, and if it exceeds 10%, water resistance will be reduced.
ＢａＯは耐水性を向上すると共にＣｕ２＋イオンに働き
６００〜７０００ｍでの吸収をシャープカットにする効
果を呈することにより用いる。BaO is used because it improves water resistance and has the effect of acting on Cu2+ ions to sharply cut absorption at 600 to 7000 m.
しかし２％未満では効果なく又３５％を越えるとガラス
を失透し易くする。However, if it is less than 2%, it is ineffective, and if it exceeds 35%, the glass tends to devitrify.
こ５でＢａＯの一部をＳｒＯにかえ、併用することはさ
し支えない。In step 5, part of BaO may be replaced with SrO and used in combination.
ＺｎＯはガラス組成調合原料中の不純物から混入するＦ
ｅ２＋イオンを固定し、紫外域の透過率を向上させるが
、５％を越えて用いる時には可祈１域の透過率を減少さ
せて不適当である。ZnO is F mixed in from impurities in the glass composition preparation raw materials.
It fixes e2+ ions and improves the transmittance in the ultraviolet region, but when used in excess of 5%, the transmittance in the UV region decreases, which is inappropriate.
ＭｇＯは耐水性を良好にするために用い、１％未満では
この効果が乏しく、８％を越えるとＺｎＯと同様に可視
域で吸収を生じる所から用量を規定する。MgO is used to improve water resistance; if it is less than 1%, this effect is poor, and if it exceeds 8%, absorption occurs in the visible range like ZnO, so the dose is determined based on this.
ＣａＯは耐水性向上と、失透防止の両効果を狙い用いら
れる。CaO is used to improve water resistance and prevent devitrification.
但し５％を越えて用いることは紫外域の吸収を増加させ
る所から避ける。However, use of more than 5% should be avoided as it increases absorption in the ultraviolet region.
尚ＺｎＯＭｇＯ１Ｃａ０三者の合計は、耐水性向上効果
を得させるため少くとも３％とし、可視域の吸収を僧ブ
相六＋＋かい上うシと１．−六ヘシこ尖濱袢を／十にさ
せないため１５％までに限定した。In addition, the total of ZnOMgO1Ca0 should be at least 3% in order to obtain the effect of improving water resistance, and the absorption in the visible range should be 1. -In order to prevent Rokuheshiko Tsubamebaka from becoming 10%, it was limited to 15%.
Ｂ２Ｏ３、ＴｉＯ２は何れも３％以下、ＺｒＯ□は５％
以下耐水性を改良する目的で使用されるが、これらの範
囲を越えて使用することはガラスに失透性を与え好まし
くない。B2O3 and TiO2 are both 3% or less, ZrO□ is 5%
Although it is used below for the purpose of improving water resistance, it is not preferable to use it beyond these ranges because it imparts devitrification to the glass.
ＳＯ３の効果の原因は明らかでないが、耐水性を向上さ
せることにある。The reason for the effect of SO3 is not clear, but it is due to improving water resistance.
さらに溶融中のガラスを強酸化性に保持するこ吉ができ
、Ｃｕ２＋イオンの着色効果を高め、近赤外線のシャー
プカットに対して著しい効果がある。Furthermore, it is possible to maintain the strong oxidizing properties of glass during melting, enhance the coloring effect of Cu2+ ions, and have a remarkable effect on sharp cutting of near-infrared rays.
そうして、このＳ０３はアルカリ金属、アルカリ土類金
属、銅等に係る調合原料を選択し硫酸塩とすることで導
入して良く、用量は０．２％未満では耐水性を向上させ
ることができず１％を越えることは可視域の吸収を増大
するために避ける。Then, this S03 can be introduced by selecting a blended raw material related to alkali metals, alkaline earth metals, copper, etc. and converting it into a sulfate. If the amount is less than 0.2%, water resistance cannot be improved. If it cannot exceed 1%, it should be avoided because it increases absorption in the visible range.
ＣｕＯは赤外域遮断を良好にする為に最小限０．５％を
要し、８％を越えることは可視域５００ ｎｍの透過率
を減少し、色調整用フィルタとしての感度を不良にする
点から避ける。CuO requires a minimum content of 0.5% in order to achieve good infrared cutoff, and exceeding 8% will reduce the transmittance in the visible range of 500 nm, resulting in poor sensitivity as a color adjustment filter. Avoid from.
以下実施例近赤外カットフィルタガラスについて組成を
表示する。The compositions of the near-infrared cut filter glasses of Examples are shown below.
但し表中／ｆ６１は比較例ガラス組成で、／１６２〜扁
８が実施例組成である。However, /f61 in the table is a comparative example glass composition, and /162 to 8 are example compositions.
又耐水性は光学硝子Ｉｓ会法によって示しである。Also, water resistance is indicated by the optical glass Is method.
図に各例ガラスにつき分光透過率（７ｏ）を示す。The figure shows the spectral transmittance (7o) for each example glass.
但し曲線洗は組成屑に対応させである。However, the curve cleaning corresponds to composition waste.
曲線中／Ｉ６１゜２．３，４，５．８は厚さ１．０驕、
洗６，７は厚さＱ、５ｍの薄片について測定されたもの
である。In the curve/I61゜2.3, 4, 5.8, the thickness is 1.0 mm,
Measurements 6 and 7 were measured on a thin piece having a thickness of Q and a thickness of 5 m.
何れも上記表組酸となるよう□□□酸化物、硫酸塩等原
料を調合混合し、石英坩堝で１１００〜１３００℃の温
度に熔融し、清澄、攪拌後金枠中に鋳込み冷却したガラ
ス薄片に係る。All of them are glass flakes made by mixing raw materials such as oxides and sulfates to form the above-mentioned acids, melting them in a quartz crucible at a temperature of 1100 to 1300°C, fining and stirring, and then casting them into a metal frame and cooling them. Pertains to.
表及び図によると、ＳＯ３を含み規定された組成から成
る実施例ガラス薄片は分光特性を所定にし且つ比較例ガ
ラス薄片に比較して著しく耐水性を良好にしている。According to the tables and figures, the Example glass flake having a defined composition containing SO3 has the specified spectral characteristics and has significantly better water resistance than the Comparative Example glass flake.
図面は比較例並びに実施例ガラス薄片に係る分光透過曲
線図である。The drawings are spectral transmission curve diagrams of comparative example and example glass flakes.
Claims (1)
２００〜５％、且つＮａ２Ｏ十に２０＋Ｌｉ２０−２〜
１０％、ＢａＯ２〜３５％、Ｚｎ００〜５％、ＭｇＯ１
〜８％、Ｃａ０Ｏ〜５％、且つＺｎＯ＋ＭｇＯ＋Ｃａ０
＝３〜１５％、Ｂ２０３０〜３％、ＴｌＯ２０〜３％、
Ｚｒ００〜５％、５ｏ３０．２〜１．０及び着色剤とし
てＣｕ００．５〜８％から成る近赤外カットフィルタガ
ラス。[Claims] 1% by weight: PO50-85%, A12032-5 14%, Na200-5%, K2O0-5%, LI
200~5%, and Na2O+20+Li20-2~
10%, BaO2~35%, Zn00~5%, MgO1
~8%, Ca0O~5%, and ZnO+MgO+Ca0
=3-15%, B2030-3%, TlO20-3%,
A near-infrared cut filter glass consisting of Zr00-5%, 5o30.2-1.0 and Cu00.5-8% as a coloring agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2556979A JPS5915102B2 (en) | 1979-03-07 | 1979-03-07 | Near infrared cut filter glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2556979A JPS5915102B2 (en) | 1979-03-07 | 1979-03-07 | Near infrared cut filter glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55121924A JPS55121924A (en) | 1980-09-19 |
| JPS5915102B2 true JPS5915102B2 (en) | 1984-04-07 |
Family
ID=12169553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2556979A Expired JPS5915102B2 (en) | 1979-03-07 | 1979-03-07 | Near infrared cut filter glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5915102B2 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4031469C1 (en) * | 1990-10-05 | 1992-02-06 | Schott Glaswerke, 6500 Mainz, De | |
| JP2510146B2 (en) * | 1993-02-08 | 1996-06-26 | 東芝硝子株式会社 | Near infrared cut filter glass |
| DE19546313C1 (en) * | 1995-12-12 | 1997-01-23 | Schott Glaswerke | New copper oxide-contg. alumino-phosphate glass |
| GB2372500B (en) | 2001-02-22 | 2003-08-20 | Reckitt Benckiser Nv | Process for Inhibition of Corrosion of Glassware during Automatic Dishwashing |
| JP4744795B2 (en) * | 2003-09-04 | 2011-08-10 | Ｈｏｙａ株式会社 | Preform for precision press molding and manufacturing method thereof, optical element and manufacturing method thereof |
| JP5265603B2 (en) * | 2004-07-15 | 2013-08-14 | Ｈｏｙａ株式会社 | Phosphate optical glass, precision press-molding preform and manufacturing method thereof, optical element and manufacturing method thereof |
| JP4533069B2 (en) * | 2004-07-15 | 2010-08-25 | Ｈｏｙａ株式会社 | Phosphate optical glass, precision press-molding preform and manufacturing method thereof, optical element and manufacturing method thereof |
| US7598189B2 (en) | 2004-09-29 | 2009-10-06 | Hoya Corporation | Phosphate optical glass, preform for precision press molding and manufacturing method of the same, optical element and manufacturing method of the same |
| CN1974453B (en) * | 2005-09-30 | 2011-08-17 | Hoya株式会社 | Optical glass, precision press molding preform and manufacturing method of the same, optical element and manufacturing method of the same |
| JP5123487B2 (en) | 2005-09-30 | 2013-01-23 | Ｈｏｙａ株式会社 | Optical glass for precision press molding, preform for precision press molding and manufacturing method thereof, optical element and manufacturing method thereof |
| WO2011046155A1 (en) * | 2009-10-16 | 2011-04-21 | 旭硝子株式会社 | Near-infrared ray cut filter glass |
| JP5445197B2 (en) * | 2010-02-12 | 2014-03-19 | 旭硝子株式会社 | Near-infrared cut filter glass and method for producing near-infrared cut filter glass |
| JP6233563B2 (en) * | 2013-07-05 | 2017-11-22 | 日本電気硝子株式会社 | Glass for IR cut filter |
| CN104788019B (en) * | 2014-01-16 | 2018-04-10 | 成都光明光电股份有限公司 | Glass composition |
| CN105800927B (en) * | 2014-12-31 | 2019-07-05 | 盈盛科技股份有限公司 | Improvement type near infrared ray filter glass |
| CN110194589B (en) * | 2019-06-25 | 2022-02-01 | 成都光明光电股份有限公司 | Near-infrared light absorbing glass, glass product, element and optical filter |
| CN111138082B (en) * | 2020-01-13 | 2022-06-17 | 苏州众为光电有限公司 | High-stability glass optical fiber and preparation method thereof |
| CN113511813B (en) * | 2021-06-28 | 2022-03-04 | 成都光明光电有限责任公司 | Edge-coated glass for laser glass and preparation method and application thereof |
-
1979
- 1979-03-07 JP JP2556979A patent/JPS5915102B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55121924A (en) | 1980-09-19 |
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