JPH0443970Y2 - - Google Patents
Info
- Publication number
- JPH0443970Y2 JPH0443970Y2 JP1984115975U JP11597584U JPH0443970Y2 JP H0443970 Y2 JPH0443970 Y2 JP H0443970Y2 JP 1984115975 U JP1984115975 U JP 1984115975U JP 11597584 U JP11597584 U JP 11597584U JP H0443970 Y2 JPH0443970 Y2 JP H0443970Y2
- Authority
- JP
- Japan
- Prior art keywords
- arc tube
- cermet
- tube
- end cap
- lamp
- 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
- 239000011195 cermet Substances 0.000 claims description 30
- 229910001507 metal halide Inorganic materials 0.000 claims description 14
- 150000005309 metal halides Chemical class 0.000 claims description 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 12
- 239000000565 sealant Substances 0.000 claims description 9
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 2
- 239000000919 ceramic Substances 0.000 description 11
- 238000009877 rendering Methods 0.000 description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- 229910052736 halogen Inorganic materials 0.000 description 4
- 150000002367 halogens Chemical class 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000012812 sealant material Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
Description
産業上の利用分野
本考案は透光性セラミツク管よりなる発光管内
に金属ハロゲン化物を封入した金属蒸気放電灯の
改良に関する。
従来の技術
発光管内に水銀及び希ガスと共に各種の金属ハ
ロゲン化物を封入したメタルハライドランプは、
高い効率と優れた演色性を兼ね備えたランプとし
て各分野で使用されている。
しかしながら、メタルハライドランプは発光管
材料として石英を用いているために高圧ナトリウ
ムランプの発光管材料として用いられているアル
ミナの様な耐熱性の高いセラミツクに比較して使
用温度限界が低く、より高い効率とより優れた演
色性を得ようとしたとき、この使用温度限界が障
害になつていた。すなわち、メタルハライドラン
プは発光管の管壁負荷を高めるなどして動作温度
を高めるとより高い効率とより優れた演色性が得
られるが、このような高い温度には石英が長時間
耐えることができないためランプの短寿命をもた
らす結果となつていた。
又、メタルハライドランプの動作中の発光管最
高温度は発光管管体の中心部にあり、動作可能温
度はこの部分の温度によつて規制され、更に動作
中の発光管封入物の蒸気圧は発光管端部の温度に
よつて規制された端部の保温板等の大きさによつ
て任意の蒸気圧が得られるようになつている。
そこで、メタルハライドランプの動作温度を上
げ、より高い効率とより優れた演色性を得るため
に、石英製の発光管に代えて石英よりも耐熱性と
化学的安定性の高いアルミナセラムツク管を用い
ることが種々試みられている。
このセラミツク製発光管を用いた金属蒸気放電
灯の発光管の端部閉塞体として、例えば特開昭55
−76563号公報に示されているようにタングステ
ン金属をアルミナ粉末中に少量添加したセラミツ
ク体すなわち導電性サーメツトを用いることによ
り、高圧ナトリウムランプの端部閉塞体として用
いられている高温でハロゲンに侵食され易いニオ
ビウム管を用いることなく、発光管電極の支持及
び電極への電流の導入が可能となつた。又、発光
管の両端部のセラミツク管と導電性サーメツトと
の封着は酸化物封着剤を溶融固化することによつ
て行なわれている。
しかしながら、このような封着剤を用いた場合
発光管両端部のうち点灯中に他方に比べてより高
温となる一方の端部において封着剤部分にクラツ
クが生じ、リークする恐れがあつた。又、封着剤
材料が電子放射物質としての作用をなし、電極先
端に生ずべきアーク放電が封着剤の部分に生じる
バツクアーク現象が発生し、クラツクやリークの
発生が助長されることがあり、更に高温で長時間
の点灯により封着剤がハロゲンにより侵食されク
ラツクやリークが発生する欠点があつた。
そこで、この種放電灯では封着剤はできる限り
使用しないことが望まく、たとえ使用しても必要
最小限にとどめることが望ましい。
又、特公昭58−3336号公報に開示されている高
圧ナトリウムランプのように、端キヤツプとして
透光性アルミナセラミツク管と同じ材質のアルミ
ナを用い、端キヤツプと透光性セラミツク管との
間に貫通導体を配置したうえ、前記端キヤツプを
透光性セラミツク管に対して、いわゆる焼嵌めに
よつて固定するものが知られている。
しかし、この構造によると透光性セラミツク管
と端キヤツプとの間に発光管電極への導電体とし
ての貫通導体を挟んであるため、発光管の端部が
極めて高温になると、前記各構成部材の熱膨張率
の違いにより発光管の気密性が損なわれる恐れが
ある。
又、かかる構造を発光管の他端部にも採用する
と、発光管に対する封入物質の導入が困難になる
等、組み立て作業上の問題が生じる。
前記及び従来技術に鑑み、本考案者等は発光管
の片側一端を封着剤を用いることなく発光管焼結
時にセラミツク管と導電性サーメツトを一体焼結
することを考案し、放電灯寿命期間中におけるク
ラツクやリークの発生及びハロゲン蒸気の侵食に
よるリークの発生を防止することが可能となつ
た。（実願昭59−21763号）
しかしながら、このような構造の放電灯におい
ても点滅を繁雑に行なう場合あるいは点滅回数の
増加に伴ない更に放電灯を水平点灯した場合サー
メツト、特に一体焼結側のサーメツトにクラツク
が生じリークの原因となることがあつた。
本考案は上記の点に鑑みなされたもので、発光
管として、透光性アルミナセラミツク管と端キヤ
ツプとしての導電性サーメツトを用いたメタルハ
ライドランプにおいて、一端側をセラミツク管と
サーメツト製の端キヤツプとで一体焼結し、他端
は端キヤツプを封着剤を介して固定した発光管
の、前記一体焼結側の発光管端部外径と導電性サ
ーメツト製の端キヤツプ外径の寸法比及び前記サ
ーメツトの発光管管軸方向の封止長とを所定の範
囲とすることにより、発光管端キヤツプとしての
導電性サーメツトの利点を最大限に生かすことが
でき、また、発光管内への金属ハロゲン化物の封
入等の組立て作業が容易である。更に、ランプ点
滅回数の増加あるいは水平点灯した場合でも導電
性サーメツト、特に一体焼結側のサーメツトにク
ラツクが生じることもなく長寿命で高い発光効率
と優れた演色性を有するメタルハライドランプを
提供することを目的とする。
問題点を解決するための手段
本考案者等は前記した一体焼結した発光管端部
のクラツク発生原因について詳細に検討したとこ
ろ、このようなクラツクは第１図に示すような発
光管端部においてはランプ点灯中のアルミナセラ
ミツク管の熱伝導率と導電性サーメツトの熱伝導
率との差に基づく両者の温度差と熱膨張係数の差
から生じることが判明した。
つまり、点灯中の発光管端部の温度上昇は放電
アークの熱損失によるアルミナ管からの熱伝導効
果と、加熱された電極から電極心棒を伝わつてサ
ーメツトへ達するものとが考えられるが、このよ
うなランプにおいては点灯直後に高圧ナトリウム
ランプと異なり、アーク温度が高く、電極からの
熱伝導によるサーメツトへの急激な加熱がなされ
更にはサーメツトの方がアルミナよりも熱伝導率
が高いために（0.109cal／sec・cm2℃：0.086cal／
sec・cm2℃）サーメツト−アルミナ間でのせん断
応力が大きくなり、これがクラツク発生の原因と
なつている。
そこで、本考案者等は第１図及び第２図に示す
ような発光管構造すなわち発光管の一体焼結部の
外径Ｄとサーメツトの外径ｄとの関係を（Ｄ−
ｄ）／ｄ≦３とし、かつ前記サーメツトの封止長
ｌを３〜８mmとすることによりランプ寿命期間を
通して導電性サーメツトにクラツクが発生するこ
とを防止することができることを確認した。
実施例
以下、本考案の一実施例を第１図に基づいて説
明する。
図中１は本考案に係るメタルハライドランプの
発光管を示し、透光性アルミナセラミツク管２よ
りなり、一端側６はあらかじめアルミナ−タング
ステンよりなる導電性サーメツト製の端キヤツプ
７がセラミツク管２と一体焼結された構造となつ
ており、その反対側の他端３はアルミナ−タング
ステンよりなる導電性サーメツト製端キヤツプ４
が酸化物封着剤５により封着されている。
又、前記端キヤツプ４，７には先端に電極８，
９を備えた電極心棒及び外部リード線１０，１１
が植設されている。
なお、発光管内には少なくとも発光物質として
の金属ハロゲン化物が封入してあるが、発光管組
み立ての際、セラミツク管の一端側と端キヤツプ
をあらかじめ一体焼結し、封入作業を行ない、他
端側は封着剤を介して端キヤツプを封着すること
により行なう。
そして、端部外径Ｄとサーメツトの外径ｄとの
関係すなわち、発光管端部の肉厚（Ｄ−ｄ）とサ
ーメツトの外径ｄとの関係：（Ｄ−ｄ）／ｄ≦３
であり、かつサーメツトの封止長ｌは３〜８mmと
なつている。
次に、実験結果について説明する。
実験に用いた発光管及びランプ仕様は次の通り
である。
発光管中央部内径 ：８mmφ
電極間距離 ：20mm
封入物 ：DyI3−TlI−CaI−Hg，Ar
INDUSTRIAL APPLICATION FIELD The present invention relates to an improvement of a metal vapor discharge lamp in which a metal halide is sealed in an arc tube made of a translucent ceramic tube. Conventional technology Metal halide lamps, in which various metal halides are sealed together with mercury and rare gases in the arc tube, are
It is used in various fields as a lamp that combines high efficiency and excellent color rendering. However, since metal halide lamps use quartz as the arc tube material, they have a lower operating temperature limit and higher efficiency than highly heat-resistant ceramics such as alumina, which are used as the arc tube material of high-pressure sodium lamps. When trying to obtain even better color rendering properties, this usage temperature limit became an obstacle. In other words, metal halide lamps can achieve higher efficiency and better color rendering by increasing the operating temperature by increasing the tube wall load of the arc tube, but quartz cannot withstand such high temperatures for long periods of time. This resulted in a shortened lamp life. In addition, the maximum temperature of the arc tube during operation of a metal halide lamp is at the center of the arc tube body, and the operating temperature is regulated by the temperature of this area. Any vapor pressure can be obtained by adjusting the size of the heat insulating plate at the end, which is regulated by the temperature at the end of the tube. Therefore, in order to raise the operating temperature of metal halide lamps and obtain higher efficiency and better color rendering, an alumina ceramic tube, which has higher heat resistance and chemical stability than quartz, is used instead of a quartz arc tube. Various attempts have been made to do so. For example, as an end blocker of a metal vapor discharge lamp using this ceramic arc tube, the
As shown in Publication No. 76563, by using a ceramic body in which a small amount of tungsten metal is added to alumina powder, that is, a conductive cermet, it is eroded by halogen at high temperatures, which is used as the end closure of high-pressure sodium lamps. It became possible to support the arc tube electrodes and introduce current to the electrodes without using a niobium tube, which is susceptible to damage. Further, the ceramic tube and the conductive cermet at both ends of the arc tube are sealed by melting and solidifying an oxide sealant. However, when such a sealant is used, cracks may occur in the sealant at one end of the arc tube, which becomes hotter than the other during lighting, and there is a risk of leakage. In addition, the sealant material acts as an electron emitting substance, and the arc discharge that should have occurred at the tip of the electrode may occur in the sealant, causing a back-arc phenomenon, which may promote the occurrence of cracks and leaks. Furthermore, the sealing agent is eroded by halogen due to long-term lighting at high temperatures, resulting in cracks and leaks. Therefore, in this type of discharge lamp, it is desirable to avoid using sealant as much as possible, and even if it is used, it is desirable to keep it to the minimum necessary. Also, as in the high-pressure sodium lamp disclosed in Japanese Patent Publication No. 58-3336, the end cap is made of alumina, which is the same material as the translucent alumina ceramic tube, and there is a gap between the end cap and the translucent ceramic tube. It is known that in addition to disposing a through conductor, the end cap is fixed to a translucent ceramic tube by so-called shrink fitting. However, according to this structure, a through conductor as a conductor to the arc tube electrode is sandwiched between the translucent ceramic tube and the end cap, so if the end of the arc tube becomes extremely hot, each of the components The airtightness of the arc tube may be impaired due to the difference in the coefficient of thermal expansion. Further, if such a structure is adopted at the other end of the arc tube, problems arise in assembly work, such as difficulty in introducing the encapsulating substance into the arc tube. In view of the above and the prior art, the present inventors devised a method of integrally sintering the ceramic tube and conductive cermet at one end of the discharge tube without using a sealant at one end of the discharge tube during the sintering of the discharge tube, thereby reducing the lifespan of the discharge lamp. It has become possible to prevent the occurrence of cracks and leaks inside the structure, as well as the occurrence of leaks due to the erosion of halogen vapor. (Utility Application No. 59-21763) However, even in a discharge lamp with such a structure, if the flashing is performed in a complicated manner or if the discharge lamp is lit horizontally due to an increase in the number of flashings, the cermet, especially the integral sintered side, may Cracks could occur in the cermet, causing leaks. The present invention was developed in view of the above points, and is a metal halide lamp that uses a translucent alumina ceramic tube as an arc tube and a conductive cermet as an end cap. The dimensional ratio of the outer diameter of the end of the arc tube on the integrally sintered side and the outer diameter of the end cap made of conductive cermet, of the arc tube whose other end is integrally sintered with an end cap fixed via a sealant. By setting the sealing length of the cermet in the axial direction of the arc tube within a predetermined range, the advantages of the conductive cermet as an end cap of the arc tube can be maximized, and metal halogens can be prevented from entering the arc tube. Assembly work such as enclosing compounds is easy. Furthermore, it is an object of the present invention to provide a metal halide lamp which does not cause cracks in the conductive cermet, especially the cermet on the integrally sintered side, even when the number of lamp blinks is increased or when the lamp is lit horizontally, and has a long life, high luminous efficiency, and excellent color rendering properties. With the goal. Means for Solving the Problems The inventors of the present invention have investigated in detail the causes of cracks at the end of the integrally sintered arc tube described above, and have found that such cracks occur at the end of the arc tube as shown in Figure 1. It was found that this is caused by the difference in temperature and coefficient of thermal expansion between the alumina ceramic tube and the conductive cermet, which are based on the difference in thermal conductivity during lighting of the lamp. In other words, the temperature rise at the end of the arc tube during lighting is thought to be due to the heat conduction effect from the alumina tube due to heat loss in the discharge arc, and the heated electrode passing through the electrode core and reaching the cermet. Unlike high-pressure sodium lamps, the arc temperature is high immediately after lighting, and the cermet is rapidly heated due to heat conduction from the electrodes.Furthermore, cermet has a higher thermal conductivity than alumina (0.109 cal/sec・cm 2 ℃: 0.086cal/
sec・cm 2 ℃) The shear stress between the cermet and alumina increases, which causes cracks to occur. Therefore, the present inventors established the relationship between the outer diameter D of the integrally sintered part of the arc tube structure and the outer diameter d of the cermet as shown in FIGS. 1 and 2 (D-
It has been confirmed that by setting d)/d≦3 and setting the sealing length l of the cermet to 3 to 8 mm, it is possible to prevent cracks from occurring in the conductive cermet throughout the life of the lamp. Embodiment Hereinafter, an embodiment of the present invention will be described based on FIG. In the figure, reference numeral 1 shows an arc tube of a metal halide lamp according to the present invention, which is made of a translucent alumina ceramic tube 2, and one end 6 has an end cap 7 made of a conductive cermet made of alumina-tungsten integrated with the ceramic tube 2. It has a sintered structure, and the other end 3 on the opposite side has an end cap 4 made of conductive cermet made of alumina-tungsten.
is sealed with an oxide sealant 5. Further, the end caps 4, 7 have electrodes 8,
Electrode mandrel with 9 and external lead wires 10, 11
has been planted. Note that at least a metal halide as a luminescent substance is sealed inside the arc tube, but when assembling the arc tube, one end of the ceramic tube and the end cap are sintered together in advance, the sealing work is performed, and the other end is sealed. This is done by sealing the end caps using a sealing agent. The relationship between the outer diameter D of the end and the outer diameter d of the cermet, that is, the relationship between the wall thickness (D-d) of the end of the arc tube and the outer diameter d of the cermet: (D-d)/d≦3
And the sealing length l of the cermet is 3 to 8 mm. Next, the experimental results will be explained. The specifications of the arc tube and lamp used in the experiment are as follows. Inner diameter of arc tube center: 8mmφ Distance between electrodes: 20mm Inclusions: DyI 3 −TlI−CaI−Hg, Ar
【表】
考案の効果
以上の説明から明らかなように、本考案は、発
光管の一端を導電性サーメツト製の端キヤツプで
一体焼結し、他端を封着剤を介して端キヤツプで
封着したメタルハライドランプにおいて、一体焼
結側の発光管端部外径とサーメツト製端キヤツプ
外径との関係及びサーメツトの封止長を所定の範
囲に選定することにより、発光管内発光物質の封
入作業を含む発光管組み立て作業を容易とし、ラ
ンプ点滅を煩雑に行なう場合あるいは点滅回数の
増加に伴ない、又ランプを水平点灯した場合に一
体焼結側の端キヤツプに生じるクラツクを防止す
ることができ長寿命のランプを得ることができる
ばかりでなく、高発光効率で優れた演色性を有す
る透光性アルミナセラミツク管を用いたメタルハ
ライドランプを得ることができる。[Table] Effects of the invention As is clear from the above explanation, the invention consists of integrally sintering one end of the arc tube with an end cap made of conductive cermet, and sealing the other end with the end cap using a sealing agent. In the metal halide lamp that has been installed, the relationship between the outer diameter of the end of the arc tube on the integrally sintered side and the outer diameter of the cermet end cap and the sealing length of the cermet are selected within a predetermined range. This simplifies the assembly work of the arc tube, including the lamp, and prevents cracks that occur in the end cap on the integrally sintered side when the lamp is blinked in a complicated manner or when the number of blinks increases, or when the lamp is lit horizontally. Not only can a long-life lamp be obtained, but also a metal halide lamp using a translucent alumina ceramic tube having high luminous efficiency and excellent color rendering properties can be obtained.
第１図は本考案に係る発光管の一実施例を示す
一部縦断側面図、第２図は同じく要部を示す説明
図である。
FIG. 1 is a partially longitudinal side view showing an embodiment of the arc tube according to the present invention, and FIG. 2 is an explanatory view showing the main parts of the same.
Claims (1)
９を備えた電極心棒及び外部リード線１１を埋設
した導電性サーメツト製の端キヤツプ７を一体焼
結固定し、内部に金属ハロゲン化物を封入し、か
つ他端に電極８を備えた電極心棒及び外部リード
線１０を埋設した導電性サーメツト製の端キヤツ
プ４を封着剤を介して気密に固定してなる発光管
１を具備したメタルハライドランプにおいて、 前記一体焼結側の発光管端部外径Ｄとサーメツ
ト製の端キヤツプ外径ｄとの関係を（Ｄ−ｄ）／
ｄ≦３とし、かつ端キヤツプの発光管管軸方向の
封止長ｌを３〜８mmとすることを特徴とするメタ
ルハライドランプ。[Scope of Claim for Utility Model Registration] An end cap 7 made of conductive cermet in which an electrode mandrel with an electrode 9 and an external lead wire 11 are embedded is integrally sintered and fixed to one end of the translucent alumina ceramic tube 2. An arc tube is formed by sealing an electrode core with an electrode 8 at the other end and an end cap 4 made of conductive cermet in which an external lead wire 10 is embedded, airtightly fixed via a sealant. 1, the relationship between the outer diameter D of the arc tube end on the integrally sintered side and the outer diameter d of the cermet end cap is (D-d)/
A metal halide lamp characterized in that d≦3 and the sealing length l of the end cap in the axial direction of the arc tube is 3 to 8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11597584U JPS6133364U (en) | 1984-07-31 | 1984-07-31 | metal halide lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11597584U JPS6133364U (en) | 1984-07-31 | 1984-07-31 | metal halide lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6133364U JPS6133364U (en) | 1986-02-28 |
| JPH0443970Y2 true JPH0443970Y2 (en) | 1992-10-16 |
Family
ID=30674924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11597584U Granted JPS6133364U (en) | 1984-07-31 | 1984-07-31 | metal halide lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6133364U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100778743B1 (en) * | 2001-12-24 | 2007-11-23 | 주식회사 포스코 | Device for blocking slag of tundish in continuous casting plant |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS583336A (en) * | 1981-06-29 | 1983-01-10 | Fujitsu Ltd | Optical transmission system |
-
1984
- 1984-07-31 JP JP11597584U patent/JPS6133364U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS583336A (en) * | 1981-06-29 | 1983-01-10 | Fujitsu Ltd | Optical transmission system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6133364U (en) | 1986-02-28 |
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