JPS62113354A - Metal vapor discharge lamp - Google Patents
Metal vapor discharge lampInfo
- Publication number
- JPS62113354A JPS62113354A JP25185885A JP25185885A JPS62113354A JP S62113354 A JPS62113354 A JP S62113354A JP 25185885 A JP25185885 A JP 25185885A JP 25185885 A JP25185885 A JP 25185885A JP S62113354 A JPS62113354 A JP S62113354A
- Authority
- JP
- Japan
- Prior art keywords
- support frame
- arc tube
- metal vapor
- tube
- discharge 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.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 22
- 239000002184 metal Substances 0.000 title claims abstract description 22
- 239000000919 ceramic Substances 0.000 claims abstract description 9
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052753 mercury Inorganic materials 0.000 abstract description 3
- 238000005087 graphitization Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 229910000497 Amalgam Inorganic materials 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 239000010955 niobium Substances 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 238000007789 sealing Methods 0.000 description 2
- 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 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- MJGFBOZCAJSGQW-UHFFFAOYSA-N mercury sodium Chemical compound [Na].[Hg] MJGFBOZCAJSGQW-UHFFFAOYSA-N 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Discharge Lamps And Accessories Thereof (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明はセラミックス製発光管を具備した金属蒸気放電
灯に係り、特に点灯型、圧の安定性や長寿命化を図った
金属蒸気放電灯に関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a metal vapor discharge lamp equipped with a ceramic arc tube, and more particularly to a metal vapor discharge lamp of a lighting type, with stable pressure and long life. .
金属蒸気放電灯９例えば高圧ナトリウムランプにおいて
は口金を備えた外管内に、前記口金と反対側に所謂る最
冷部が位置するようにセラミックス製発光管を内装させ
た構成を一般に採っている。A metal vapor discharge lamp 9, for example, a high-pressure sodium lamp, generally has a configuration in which a ceramic arc tube is housed inside an outer bulb provided with a cap so that the so-called coldest part is located on the opposite side from the cap.
即ちこの種ランプは通常口金側を上方として使用される
ため１口金と反対側にその発光管内に封入された過剰な
アラルガムな溜めるようにした方が安定に溜め易くまた
振動などの影響を受は難いと考えられるからである。か
くして金属蒸気放電灯においては１口金と反対側に発光
管の最冷部が位置するよう外管内に封装した構成を採っ
ているが次のような不都合さがみられる。即ち外管内に
封装された発光ｇは第２図に概略的に示すように。In other words, since this type of lamp is usually used with the cap side facing upward, it is easier to store the excess alargum sealed in the arc tube on the side opposite to the cap, and it is easier to store it stably, and it is less susceptible to the effects of vibrations. This is because it is considered difficult. Thus, metal vapor discharge lamps are constructed in such a way that the coldest part of the arc tube is located on the side opposite to the cap, and the bulb is sealed inside the outer bulb, but the following disadvantages occur. That is, the luminescent light g sealed within the outer tube is as schematically shown in FIG.
セラミックス類の発光Ｗ（１）に封有した電極（２）、
（２’）のうち少なくとも一方は最冷部を兼ねる電極
給電体（３）・・・例えばＮｂ管・・・にて支持されて
いる。しかして前記電極給電体（３）は給電体を兼ねる
支持枠（４）Ｋ接続固定した発光管ホルダー（５）Ｋて
支持された購成を成している。こいように発光管を外管
内に封装した放電灯について実用してみると上記設定し
た最冷部に必ずしもアマルガムが溜らず１例えば発光管
の管端封着部に溜ったりして点灯電圧■Ｌの上昇を招い
たり、上記管端封着部に溜ったアマルガムが封漸ンルダ
ーと反応して黒化な起生ずるなど安定性（長寿命化）が
損われると云う問題があった。An electrode (2) sealed in a luminescent W (1) of ceramics,
At least one of the electrodes (2') is supported by an electrode feeder (3), which also serves as the coldest part, for example, a Nb tube. Thus, the electrode power supply body (3) is supported by an arc tube holder (5) K connected and fixed to a support frame (4) K which also serves as a power supply body. In practical use of a discharge lamp in which the arc tube is sealed inside the outer bulb, amalgam does not necessarily accumulate in the coldest part set above, but for example, amalgam may accumulate in the sealed end of the arc tube, causing the lighting voltage to decrease. There have been problems in that stability (longer life) is impaired, such as an increase in the temperature of the tube, and amalgam that has accumulated in the tube end sealing portion reacts with the sealant and causes blackening.
本発明者らはかかる事情に対処して検討を進めた結果、
上記、金属蒸気放電灯の構成において。As a result of the inventors' investigations in response to such circumstances,
In the above structure of the metal vapor discharge lamp.
外管内に発光管を支持する支持枠と発光管との距離が上
記安定性に大きく影響することを確認した。It was confirmed that the distance between the arc tube and the support frame that supports the arc tube within the outer tube greatly affects the stability.
本発明は最冷部を兼ねる電極給電体を具備したセラミッ
クス製発光管を外管内に封装、シ、且つ給電体を兼ねる
支持枠と、前記電極給電体とを発光管ホルダーにて接続
固定した構成の金属蒸気放電灯の封入した過剰アマルガ
ムによる障害を除去し。The present invention has a structure in which a ceramic arc tube equipped with an electrode power feeder that also serves as the coldest part is sealed in an outer bulb, and a support frame that also serves as the power feeder and the electrode power feeder are connected and fixed by an arc tube holder. Eliminates interference caused by excess amalgam in metal vapor discharge lamps.
換言すれば最冷部温度を維持しもってランプ特性の安定
化を図った金属蒸気放電灯を提供することを目的とする
ものである。In other words, the object of the present invention is to provide a metal vapor discharge lamp in which lamp characteristics are stabilized by maintaining the temperature of the coldest part.
本発明は金属蒸気放電灯の特性安定化を目的としたもの
で、５＃光管ホルダーを介して発光管の最冷部に接続し
１発光管の支持固定に関与する給電体を兼ねる支持枠と
発光管中央部の外表面との間隔（Ｌ）を発光管の入力（
Ｗ）との関係で所定の距離に設定したことをもって特像
付けられる。The present invention is aimed at stabilizing the characteristics of metal vapor discharge lamps, and includes a support frame that is connected to the coldest part of the arc tube through a 5# light tube holder and also serves as a power supply body that is involved in supporting and fixing one arc tube. Enter the distance (L) between the outer surface of the arc tube center and the outer surface of the arc tube (
A special feature is given by setting a predetermined distance in relation to W).
即ち本発明は最冷部を兼ねる電極給電体を有するセラミ
ックス製発光管を、給電８体を兼ねる支持枠にて少なく
とも上記最冷部を兼ねる電極給電体が接続によって支持
されて外管内に封装して成る金属蒸気放電灯において。That is, the present invention includes a ceramic arc tube having an electrode power feeder that also serves as the coldest part, and at least the electrode power feeder that also serves as the coldest part is supported by a support frame that also serves as eight power feeders by connection, and is sealed in an outer tube. In a metal vapor discharge lamp consisting of.
前記発光管中央部における外表面と前記支持枠表面との
対向する距離をＬ ＩＩとし、ランプ電力をＷＬとした
とき。When the facing distance between the outer surface at the center of the arc tube and the surface of the support frame is L II, and the lamp power is WL.
ＷＬ＜２００Ｗの場合Ｌ″’：２１１ ｍｍ２００ ｗ
Ｌ＜５００ Ｗの場合Ｌ 〉１３ ＋ｕ５００ Ｗ＜Ｗ
Ｌ ＜ １０００ Ｗの場合Ｌ〉１５朋に設定して成る
ことを特徴とする金属蒸気放電灯である。When WL<200W, L''': 211 mm200 w
When L<500 W, L 〉13 +u500 W<W
This metal vapor discharge lamp is characterized in that when L<1000 W, L>15.
以下本発明に係る金属蒸気放電灯の一構成例を示す第１
図を参照して本発明を説明する。図において（６）は外
管で一端側には内導線（７） 、 （８）を封装したス
テム（９）が封着され、更に上記内導線（力、（８）と
接続する口金（ｌｏｌが装着されている。また（１）は
前記外ｇ（６）内に封装された発光管であり９例えば透
光性アルミナ管よりなりその両端はガラスソルダーにて
アルミナよりなるエンドキャップ０υ、（１１’）Ｋて
封着されている。さらに発光管（１）内には始動用希ガ
ス、ナトリウム−水銀など封入されるとともに一対の放
電用電極（２）、（２つが封入されている。しかして放
電電極（２）、（２うは前記エンドキャップαυ、（１
１うを押通し気密に封止された電極給電体例えばニオブ
管（３）、及びＮｂ線（３’） Ｋて支持されている。The following is a first example of a configuration of a metal vapor discharge lamp according to the present invention.
The present invention will be explained with reference to the figures. In the figure, (6) is an outer tube, and one end side is sealed with a stem (9) that seals inner conductors (7) and (8), and a base (lol) that connects to the inner conductors (8). (1) is a luminous tube sealed inside the outer g (6), which is made of, for example, a translucent alumina tube, and its both ends are fitted with glass solder to end caps made of alumina (0υ), ( 11') K.Furthermore, a starting rare gas, sodium-mercury, etc. are sealed in the arc tube (1), and a pair of discharge electrodes (2) are also sealed. Therefore, the discharge electrode (2), (2) is the end cap αυ, (1
An electrode power supply body, for example, a niobium tube (3) and a Nb wire (3'), which are pushed through and hermetically sealed, are supported by K.
またえ
（４）は給電１体を兼ねるヅ持枠で一方の導入線（７）
と電気的に接続し、さらに発光管（１１の最冷部を兼ね
るｉｆｆ ！給電体（３）と発光管ホルダー（５）を介
して接続している。なお９発光管ホルダー（５）と電極
給電体（３）は径０．９のＮｂ線αＤにより溶接接続さ
れている。発光管（１）の一端側は上記ホルダー（５）
にて支持され。Matae (4) is a holding frame that also serves as one power feeder, and one lead-in wire (7)
It is electrically connected to the arc tube (if! power supply (3), which also serves as the coldest part of the arc tube (11), and is connected via the arc tube holder (5). The power supply body (3) is welded and connected by an Nb wire αD with a diameter of 0.9.One end of the arc tube (1) is attached to the holder (5).
Supported by.
他端側は前記給電体兼用の支持枠（４） Ｋ Ｎ気的に
絶縁して取り付けた他の発光管ホルダー（５うにより他
方の電極給電線（３つを絶縁管αＱを介して挾持して支
持されており、この他方の電極給電線（３つは前記他方
の導入線（８）と接続する一方前記他の発光管ホルダー
（５つとは絶縁線（１６１により電気的に絶縁する構成
を採っている。The other end is connected to the support frame (4) which also serves as the power supply, and the other electrode power supply wire (3 is clamped via the insulating tube The other electrode feeder line (three are connected to the other lead-in line (8), while the other arc tube holder (five are electrically insulated by an insulated wire (161). I'm picking it up.
尚図において（１のは所謂る近接導体であり、また（１
３はバイメタルスイッチ（１４）とこのバイメタルスイ
。In the figure, (1 is the so-called proximity conductor, and (1
3 is the bimetal switch (14) and this bimetal switch.
ツチα荀近傍にあってバイメタルスイッチ０４）を加熱
するヒーター（１９とを直列に接続して成る始動回路で
、一端は一方の内導線（７？）Ｋ、他端は給電体兼用の
支持枠（４）Ｋそれぞれ接続している。This is a starting circuit consisting of a heater (19) connected in series that heats a bimetal switch 04) located near the Tsuchiα. One end is one inner conductor (7?) K, and the other end is a support frame that also serves as a power supply. (4) K are connected to each other.
本発明に係る金属蒸気放電灯はこのよ）な構成即ち発光
管（１）がセラミックス製で、所謂る最冷部が少なくと
も一方の電極給電体（３）にて兼用され。The metal vapor discharge lamp according to the present invention has such a structure, that is, the arc tube (1) is made of ceramics, and the so-called coldest part is also used by at least one electrode power supply body (3).
且つこの最冷部兼用の電極給電体（３）が給電体兼用の
支持枠（４１Ｋ ９光管ホルダー（５）を介して接続さ
れるとともに支持固定される構造を基本とする金属蒸気
放電灯において２発光管（１）の中央部表面と前記支持
枠（４）との最短路＠ Ｌ ｈａｍ）をランプ電力ＷＬ
との関係にて。In addition, in a metal vapor discharge lamp based on a structure in which the electrode power feeder (3) which also serves as the coldest part is connected and supported and fixed via a support frame (41K 9 light tube holder (5)) which also serves as the power feeder. 2 The shortest path between the central surface of the arc tube (1) and the support frame (4) @ L ham) is the lamp power WL.
In relation to.
Ｗｔ、＜２００Ｗの場合 Ｌ≧１１絽
２００ Ｗ＜ ５００ Ｗの場合 Ｌ ＞ １３ ｙｘ
ｘ５００ Ｗ＜ ｗＬ＜１０００ Ｗの場合 Ｌ 〉１
５ ｙｎ＊にそれぞれ選定設定することにある。When Wt, < 200W, L ≧ 11 200 W < 500 W, L > 13 yx
x500W<wL<1000W L>1
5. Select and set each of yn*.
しかして本発明において、上記発光管のランプ富力ＷＬ
との関係で発光管と支持枠との間隔Ｌ（朋）とを上記の
如く選択、設定したのは次の理由による。即ち直径８．
７ａ＋ｔｘ＊長さ９０絹のアルミナ製発光管（１８０Ｗ
形）、直径８．７關、長さ１４０冨真のアルミナ製発光
管（４５０Ｗ形）、直径１４ｉＩｌ＊長さ１９０朋のア
ルミナ製発光管（９４０Ｗ形）をそれぞれ用い０発光管
と支持枠と力最短距離Ｌ （ｉ＋＋＊）を７〜１７間点
灯し最冷部兼用の電極給電体（３）以外の部分（発光管
内）Ｋアマルガムが溜ったりして、ランプ電圧の上昇乃
至黒化の発生が認められたランプの数をそれぞれ調査し
たところ次表に示す如くで。However, in the present invention, the lamp power WL of the arc tube is
The reason why the distance L between the arc tube and the support frame was selected and set as described above in relation to this is as follows. That is, the diameter is 8.
7a+tx*Length 90 Silk alumina arc tube (180W
0 arc tube and support frame. Lighting the shortest distance L (i++*) for 7 to 17 hours will cause amalgam to accumulate in areas other than the electrode power feeder (3), which also serves as the coldest part (inside the arc tube), resulting in an increase in lamp voltage or blackening. The number of lamps in which this was recognized was investigated and the results are shown in the table below.
上記範囲を外れると所望の安定性を有する長寿命なもの
を得られないことが実験的に確認されたからである。This is because it has been experimentally confirmed that outside the above range, a product with desired stability and long life cannot be obtained.
表
なお、上記においてはエンドキャップａυ、（１１うが
アルミナ製の場合を例示したが１例えばニオブなどの金
属製の場合、或いは高圧ナトリウムに限らず所謂るメタ
ルハライドランプなどの場合にも同様の作用効果が得ら
れる。Note that in the above, the case where the end cap aυ, Effects can be obtained.
上記実施例からも明らかのように、少なくとも一方の電
極給電体が所謂る最冷部を兼用する構成のセラミックス
袈発光管を具備し、且つ最冷部兼用の電極給電体が、給
電体兼用の支持枠に発光管ホルダーを介して接続された
金属蒸気放電灯において０発光管中央部表面と、給電体
兼用支持枠との最短距離りをランプ電力ＷＬに応じ所定
の値に常に選択設定することを要旨とする本発明によれ
ば点灯寿命時間中９点灯電圧の上昇やソルダーと水銀と
の反応に起因する黒化発生など全面的に除去される。即
ち本発明に係る金属蒸気放電灯においては発光管内に封
入されている過剰分の水銀も常に所定の最冷部（電極給
電体）に凝縮し溜った状態を維持する。このため放電灯
自体の耐振性が向上するうえ点灯時において所定の水銀
蒸気圧を常に呈し易いとともに、一方では管端封止部の
ソルダーに接することもなくなる。かくして点灯電圧の
上昇も抑制されるし、また黒化発光も防止され安定した
ランプ特性を維持、発揮する。As is clear from the above embodiments, at least one of the electrode power supply bodies is equipped with a ceramic capped arc tube configured to also serve as the so-called coldest part, and the electrode power supply body that also serves as the coldest part is also used as the power supply body. In a metal vapor discharge lamp connected to a support frame via an arc tube holder, the shortest distance between the central surface of the arc tube and the support frame that also serves as a power supply is always selected and set to a predetermined value according to the lamp power WL. According to the present invention, the rise in lighting voltage during the lighting life and the occurrence of blackening caused by the reaction between solder and mercury are completely eliminated. That is, in the metal vapor discharge lamp according to the present invention, the excess mercury sealed in the arc tube always remains condensed and accumulated in a predetermined coldest part (electrode power supply body). Therefore, the vibration resistance of the discharge lamp itself is improved, and it is easy to maintain a predetermined mercury vapor pressure at all times during lighting, and at the same time, the discharge lamp does not come into contact with the solder of the tube end sealing portion. In this way, the increase in lighting voltage is suppressed, blackening emission is also prevented, and stable lamp characteristics are maintained and exhibited.
ところで上記本発明に係る金属蒸気放電、灯が安定した
ランプ特性を維持１発揮するのは次のように考えられる
。即ち本発明にお℃・では発光管と給電体な兼ねる支持
枠との間隔（距離）を通常の場合（入力ＷＬＫ関係なく
５〜１０朋）より多く離間させている。このため発光管
からの熱による給電体兼用支持枠の温度上昇も抑制され
る。かくして支持枠−発光管ホルダー電極給電体を兼ね
る最冷部への伝熱も低減され、所謂る最冷部としての機
能を十分に果すに至ったものと考えらｈる。By the way, the reason why the metal vapor discharge lamp according to the present invention maintains and exhibits stable lamp characteristics is considered as follows. That is, in the present invention, the interval (distance) between the arc tube and the support frame which also serves as a power supply body is made larger than in the normal case (5 to 10 mm regardless of the input WLK) at .degree. Therefore, the temperature rise of the support frame which also serves as a power supply body due to heat from the arc tube is also suppressed. In this way, the heat transfer to the coldest part, which also serves as the support frame-arc tube holder electrode power supply, is reduced, and it is thought that the function as the so-called coldest part has been sufficiently fulfilled.
第１図は本発明に係る金属蒸気放電灯の構成例を示す透
視図、第２図は発光管を給電体兼用支持枠に支持固定す
る構成例の説明図である。
（１）・・・・・・発光管、 （２＋、 （２
’）・・・・・・放電電極。
（３）・・・・・・最冷部兼用の電極給電体。
（４）・・・・・・給電１体兼用支持体。FIG. 1 is a perspective view showing a configuration example of a metal vapor discharge lamp according to the present invention, and FIG. 2 is an explanatory diagram of a configuration example in which an arc tube is supported and fixed to a support frame that also serves as a power supply body. (1)... Arc tube, (2+, (2
')...Discharge electrode. (3)... Electrode power feeder that also serves as the coldest part. (4)...Single power supply support.
Claims (1)
管を、給電体を兼ねる支持枠にて少なくとも上記最冷部
を兼ねる給電体が発光管ホルダーを介して接続固定によ
つて支持されて外管に封装して成る金属蒸気放電灯にお
いて、 前記発光管中央部における表面と前記支持枠表面との対
向距離をＬｍｍとし、ランプ電力をＷ＿Ｌとしたとき、 Ｗ＿Ｌ≦２００Ｗの場合Ｌ≧１１ｍｍ ２００Ｗ＜Ｗ＿Ｌ≦５００Ｗの場合Ｌ≧１３ｍｍ５００
Ｗ＜Ｗ＿Ｌ＜１０００Ｗの場合Ｌ≧１５ｍｍに設定して
成ることを特徴とする金属蒸気放電灯。[Scope of Claims] A ceramic arc tube having an electrode power supply body that also serves as the coldest part is connected and fixed by a support frame that also serves as the power supply body so that at least the power supply body that also serves as the coldest part is connected and fixed via an arc tube holder. In a metal vapor discharge lamp which is supported by a metal vapor discharge lamp and sealed in an outer bulb, when the facing distance between the surface at the center of the arc tube and the surface of the support frame is Lmm, and the lamp power is W_L, when W_L≦200W. When L≧11mm 200W<W_L≦500W, L≧13mm500
A metal vapor discharge lamp characterized in that when W<W_L<1000W, L≧15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60251858A JPH0690916B2 (en) | 1985-11-12 | 1985-11-12 | Metal vapor discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60251858A JPH0690916B2 (en) | 1985-11-12 | 1985-11-12 | Metal vapor discharge lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62113354A true JPS62113354A (en) | 1987-05-25 |
| JPH0690916B2 JPH0690916B2 (en) | 1994-11-14 |
Family
ID=17228966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60251858A Expired - Lifetime JPH0690916B2 (en) | 1985-11-12 | 1985-11-12 | Metal vapor discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0690916B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4997473A (en) * | 1973-01-25 | 1974-09-14 | ||
| JPS52142878A (en) * | 1976-05-21 | 1977-11-29 | Hitachi Ltd | Metal vapor discharge lamp |
| JPS548996U (en) * | 1977-06-21 | 1979-01-20 | ||
| JPS6086752A (en) * | 1983-10-18 | 1985-05-16 | Toshiba Corp | High pressure sodium lamp |
-
1985
- 1985-11-12 JP JP60251858A patent/JPH0690916B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4997473A (en) * | 1973-01-25 | 1974-09-14 | ||
| JPS52142878A (en) * | 1976-05-21 | 1977-11-29 | Hitachi Ltd | Metal vapor discharge lamp |
| JPS548996U (en) * | 1977-06-21 | 1979-01-20 | ||
| JPS6086752A (en) * | 1983-10-18 | 1985-05-16 | Toshiba Corp | High pressure sodium lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0690916B2 (en) | 1994-11-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |