JPS5991653A - Low pressure mercury vapor electric-discharge tube - Google Patents
Low pressure mercury vapor electric-discharge tubeInfo
- Publication number
- JPS5991653A JPS5991653A JP20119082A JP20119082A JPS5991653A JP S5991653 A JPS5991653 A JP S5991653A JP 20119082 A JP20119082 A JP 20119082A JP 20119082 A JP20119082 A JP 20119082A JP S5991653 A JPS5991653 A JP S5991653A
- Authority
- JP
- Japan
- Prior art keywords
- outer tube
- tube
- mercury vapor
- discharge tube
- pressure mercury
- 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
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 27
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/10—Shields, screens, or guides for influencing the discharge
- H01J61/103—Shields, screens or guides arranged to extend the discharge path
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は低圧水銀蒸気放電管のうち特に内外二重管構造
を有する低圧水銀蒸気放電管に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to low-pressure mercury vapor discharge tubes, particularly to low-pressure mercury vapor discharge tubes having a double inner and outer tube structure.
低圧水銀蒸気放電管、例えば蛍光ランプの効率は放電管
内の水銀蒸気圧に影響され、従ってこの水銀蒸気圧を支
配する放電管の最冷部の温度に依存する。低圧水銀蒸気
放電管の効率を最大にする放電管最冷部の温度は、該放
電管の形状によって一多少異るが一般に４０℃前後であ
ることが知られている。第１図に本発明の対象となる内
外二重管構造を有する低圧水銀蒸気放電管（例えば電球
形蛍光ランプ）の−例を示す。この構造は特公昭５４−
４４３７０において公知である。この放電管は気密空間
をつくる外管ｌとその内部にあって一端が外管１の基底
部２に接続され他端が外管１内に開口されている２本の
内管４とからなる内外二重管構造になっている。上記外
管ｌ内には数Ｔｏｒｒの希ガスと少量の水銀が封入され
ている。本放電管は内管４の封じられた端部内に設けら
れた電極６の間で低圧水銀蒸気放電を行い、放電により
発生した紫外線を内管４の内面に塗られた蛍光体層５に
よって可視光に変換する。一般にこの種の放電管は白熱
電球の代替品を目的としているために小形で高出力であ
ることが要求される。従ってランプ電力を増大した際に
放電管の最冷部の温度が最適値を越える場合があり、そ
のために放電管の効率が低下することになる。第１図に
示す構造の放電管も外形を極力小形にして効率を低下さ
せないためには、放電管の最冷部の温度上昇を抑える手
段が必要であるか１、上記公知例にはこの点の配慮がさ
れていない。The efficiency of low-pressure mercury vapor discharge tubes, such as fluorescent lamps, is influenced by the mercury vapor pressure within the discharge tube and therefore depends on the temperature of the coldest part of the discharge tube, which governs this mercury vapor pressure. It is known that the temperature of the coldest part of a low-pressure mercury vapor discharge tube, which maximizes the efficiency of the discharge tube, is generally around 40° C., although it varies somewhat depending on the shape of the discharge tube. FIG. 1 shows an example of a low-pressure mercury vapor discharge tube (for example, a compact fluorescent lamp) having a double inner and outer tube structure, which is the object of the present invention. This structure was built in 1974.
44370. This discharge tube consists of an outer tube 1 that creates an airtight space, and two inner tubes 4 located inside the outer tube 1, one end of which is connected to the base 2 of the outer tube 1 and the other end of which is opened into the outer tube 1. It has a double pipe structure inside and outside. The outer tube 1 is filled with several Torr of rare gas and a small amount of mercury. This discharge tube performs low-pressure mercury vapor discharge between electrodes 6 provided in the sealed end of the inner tube 4, and makes the ultraviolet rays generated by the discharge visible through the phosphor layer 5 coated on the inner surface of the inner tube 4. Convert into light. Generally, this type of discharge tube is intended as a replacement for incandescent light bulbs, so it is required to be small and have high output. Therefore, when the lamp power is increased, the temperature of the coldest part of the discharge tube may exceed the optimum value, resulting in a decrease in the efficiency of the discharge tube. In order to minimize the external size of the discharge tube with the structure shown in Fig. 1 and prevent a drop in efficiency, it is necessary to have a means to suppress the temperature rise in the coldest part of the discharge tube1. is not taken into consideration.
本発明は小形で効率がよい内外二重管構造の低圧水銀蒸
気放電管を得ることを目的とする。The object of the present invention is to obtain a small and efficient low-pressure mercury vapor discharge tube having a double inner and outer tube structure.
１、
もえ肌〃ｉ 起、目的を津成するため、内外二重管構造
＊、有、する低圧水銀蒸気放電管の外管温度が上昇する
機構を調査した結果に基き、平行な２本の内管の間隔ｄ
と外管の最大外径りとの比ｄ／Ｄを０．４より小さくす
ることによって、外管の温度分布に最冷１部を作り、該
最冷部の温度を低くして水銀蒸気の上昇を抑え上記低圧
水銀蒸気放電管の効率を向上させるものである。1. In order to achieve this goal, we investigated the mechanism by which the temperature of the outer tube of a low-pressure mercury vapor discharge tube increases, which has a double-tube structure*, and two parallel tubes. Inner tube spacing d
By making the ratio d/D of the maximum outer diameter of the outer tube smaller than 0.4, the coldest part is created in the temperature distribution of the outer tube, and the temperature of the coldest part is lowered to prevent mercury vapor. This suppresses the increase in the temperature and improves the efficiency of the low-pressure mercury vapor discharge tube.
つぎに本発明の実施例を図面とともに説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
第２図は本発明による低圧水銀蒸気放電管の内管および
外管の関係位置を示す図、第３図は内管間の距離と外管
の最大径との比に対する外管先端および最冷部の温度と
の関係を示す図である。第２図において本放電管は気密
空間を作る先端が半球状の外管１の内部に、一端を外管
１の基底部２に接続して封じられ他端が外管ｌ内に開口
された２本′の内管４を平行して設け、該内管４の基底
部２の近くに電極６を電極支持線７により保持している
。なお外管１の内面には拡散膜３を有し内管４の内面に
は蛍光体層５が設けられている。このような内外二重管
構造の放電管では、プラズマの大部分が内管４内で発生
するため実質的な熱源は内管４になる。放電管点灯中の
内管４の温度を測定した結果は２０Ｗの放電管で約２０
０°Ｃ程度であった。この程度の温度では内管４から外
管１への熱の伝達は大部分が熱放射によるものであり、
熱放射による熱の伝達量は距離の２乗に反比例するから
、内管４と外管ｌの距離を離すことにより外管１の温度
を大きく下げることができる。しかし外管ｌを太き（す
ることは上記放電管を小形化するという要請に反するこ
とになる。上記放電管の最冷部は電極６から離れた位置
にあり、放電管の点灯回路を含む口金が取付けられる側
である放電管基底部２とは反対の放電管先端部付近に生
じる。FIG. 2 is a diagram showing the relative positions of the inner tube and outer tube of the low-pressure mercury vapor discharge tube according to the present invention, and FIG. 3 is a diagram showing the tip and the coldest point of the outer tube with respect to the ratio of the distance between the inner tubes and the maximum diameter of the outer tube. FIG. In Figure 2, this discharge tube is sealed inside an outer bulb 1 whose tip is semispherical to create an airtight space, with one end connected to the base 2 of the outer bulb 1 and the other end opened into the outer bulb 1. Two inner tubes 4 are provided in parallel, and electrodes 6 are held near the base 2 of the inner tubes 4 by electrode support wires 7. A diffusion film 3 is provided on the inner surface of the outer tube 1, and a phosphor layer 5 is provided on the inner surface of the inner tube 4. In such a discharge tube having a double inner and outer tube structure, most of the plasma is generated within the inner tube 4, and therefore the inner tube 4 serves as a substantial heat source. The result of measuring the temperature of inner tube 4 while the discharge tube is on is approximately 20W for a 20W discharge tube.
The temperature was around 0°C. At this temperature, most of the heat transfer from the inner tube 4 to the outer tube 1 is due to thermal radiation.
Since the amount of heat transferred by thermal radiation is inversely proportional to the square of the distance, the temperature of the outer tube 1 can be significantly lowered by increasing the distance between the inner tube 4 and the outer tube 1. However, making the outer bulb l thicker would go against the request to downsize the discharge tube.The coldest part of the discharge tube is located away from the electrode 6 and contains the lighting circuit for the discharge tube. It occurs near the tip of the discharge tube opposite to the base 2 of the discharge tube, which is the side where the cap is attached.
上記外管ｌの先端をＡ点とし、内管４に平行な面が外管
ｌと接する接線上にあって放電管基底部２から最も遠い
点をＢ点とし、２本の内管４の間の距離ｄと外管１の最
大外径りとの比ｄ／Ｄを変えた場合の上記Ａ点とＢ点の
温度変化を第３図に示す。Point A is the tip of the outer tube 1, and point B is the farthest point from the base 2 of the discharge tube on the tangent line where the surface parallel to the inner tube 4 touches the outer tube 1. FIG. 3 shows temperature changes at points A and B when the ratio d/D between the distance d and the maximum outer diameter of the outer tube 1 is changed.
−例として第３図は外管１の最大外径が７０咽、高さが
１００閣で、内管４の外径が１２咽、全長２６０咽であ
り、外管１内に数Ｔｏｒｒの希ガスと少量の水銀を封入
した放電管（定格消費電力２０Ｗ）について、内管４間
の距離ｄを変えた場合の温度変化を示している。第３図
に明らかなように、内、管４の間の距離ｄを狭くするこ
とにより外管ｌの先端Ａ点の温度は上昇するがＢ点の温
度は低下し、外管１ｃｙ’先端付近における温度分布の
拡がりを大きくすることができる。また内管４の間の距
離ｄを大きくしてＡ点を最冷部にするよりも、ｄを小さ
くしてＢ点を最冷部にする方が外管１の温度を下げるこ
とができる。内管４の間の距離ｄをほぼ最大まで離して
得られるＡ点の温度と同じ最冷部を得るた−めにはｄ／
Ｄを０４にすればよい。したがってより効果的に水銀蒸
気圧の上昇を低くして効率の低下を防ぐためには上記ｄ
／Ｄの値を０４より小さくすることが必要である。すな
わちｄ／Ｄの値を０．４より小さくすることにより水銀
蒸気圧の上昇を抑える最冷部の温度を下げ、上記放電管
の効率を向上。- As an example, in Figure 3, the maximum outer diameter of the outer tube 1 is 70 mm and the height is 100 mm, the outer diameter of the inner tube 4 is 12 mm, and the total length is 260 mm. It shows the temperature change when the distance d between the inner tubes 4 is changed for a discharge tube (rated power consumption 20 W) filled with gas and a small amount of mercury. As is clear from FIG. 3, by narrowing the distance d between the inner and outer tubes 4, the temperature at point A at the tip of the outer tube 1 increases, but the temperature at point B decreases, and the temperature near the tip of the outer tube 1cy' increases. It is possible to increase the spread of the temperature distribution. Furthermore, the temperature of the outer tube 1 can be lowered by decreasing the distance d between the inner tubes 4 and making the point B the coldest section, rather than by increasing the distance d between the inner tubes 4 and making the point A the coldest section. In order to obtain the same coldest part as the temperature at point A obtained by separating the distance d between the inner tubes 4 to almost the maximum, d/
Just set D to 04. Therefore, in order to more effectively reduce the rise in mercury vapor pressure and prevent a decrease in efficiency, the above d
It is necessary to make the value of /D smaller than 04. That is, by making the value of d/D smaller than 0.4, the temperature of the coldest part that suppresses the increase in mercury vapor pressure is lowered, and the efficiency of the discharge tube is improved.
させることかできる。外管形状が球形の場合には。I can do it. When the outer tube shape is spherical.
Ｂ点は内管４に平行な面が外管球と接する点に対応し、
やはりｉｌｏを０．４以上にすることによりＢ点を最冷
部にすることができる。Point B corresponds to the point where the plane parallel to the inner tube 4 contacts the outer bulb,
Again, by setting ilo to 0.4 or more, point B can be made the coldest part.
本発明は上記のように内外二重管構造の低圧水銀蒸気放
電管の外管内において、封じられた一端に電極を設は他
端を上記外管内に開口する２本の平行する内管間の距離
と上記外管の最大外径との比を０．４より小さくするこ
とにより、上記外管の温度分布に局部的な最冷部を作り
出し水銀蒸気圧の上昇を抑えるようにしたから、上記外
管を小形にすることによる効率の低下を防ぐことができ
、小形で効率がよい内外二重管構造の低圧水銀蒸気放電
管を得ることができる。As described above, in the outer tube of a low-pressure mercury vapor discharge tube having a double inner and outer tube structure, an electrode is provided at one sealed end, and an electrode is provided between two parallel inner tubes with the other end open into the outer tube. By making the ratio between the distance and the maximum outer diameter of the outer tube smaller than 0.4, a localized coldest part is created in the temperature distribution of the outer tube and the increase in mercury vapor pressure is suppressed. Decrease in efficiency due to making the outer tube smaller can be prevented, and a low-pressure mercury vapor discharge tube with a double inner and outer tube structure that is small and highly efficient can be obtained.
第１図は本発明の対象となる内外二重管構造を有する低
圧水銀蒸気放電管の部分断面図、第２図は本発明による
低圧水銀蒸気放電管の内管および外管の関係位置を示す
説明図、第３図は内管間の距離と外管の最大外径との比
に対する外管のＡ点Ｂ点の温度の関係を示す図である。
ｌ・・・外管 ４・・・内管６・・・電極
代理人弁理士 中村純之助
１Ｆ１ 口
十３１’！Ｊ
ろ
第１頁の続き
０発 明 者 御子柴茂生
国分寺市東恋ケ窪−丁目２８０番
地株式会社日立製作所中央研究
所内
０発 明 者 村山績−
国分寺市東恋ケ窪−丁目２８０番
地株式会社日立製作所中央研究
所内FIG. 1 is a partial cross-sectional view of a low-pressure mercury vapor discharge tube having a double inner and outer tube structure, which is the object of the present invention, and FIG. 2 shows the relative positions of the inner tube and outer tube of the low-pressure mercury vapor discharge tube according to the present invention. The explanatory diagram, FIG. 3, is a diagram showing the relationship between the temperature at point A and point B of the outer tube and the ratio of the distance between the inner tubes and the maximum outer diameter of the outer tube. l...Outer tube 4...Inner tube 6...Electrode agent patent attorney Junnosuke Nakamura 1F1 Mouth 131'! Continued from page 1 0 Author: Shigeo Mikoshiba, 280 Higashi-Koigakubo-chome, Kokubunji City, Hitachi, Ltd. Central Research Laboratory 0 Author: Akira Murayama - 280 Higashi-Koigakubo-chome, Kokubunji City, Hitachi, Ltd. Central Research Laboratory
Claims (1)
極を有し他端が上記外管内に開口する２本の内管を平行
して設け、該内管間の距離ｄと上記外管の最大外径りと
の比ｄ／Ｄを０．４より小さくした低圧水銀蒸気放電管
。Two inner tubes having electrodes at one sealed end and opening into the outer tube at the other end are provided in parallel inside an outer tube forming an airtight space, and the distance d between the inner tubes and the above A low-pressure mercury vapor discharge tube in which the ratio d/D to the maximum outer diameter of the outer tube is smaller than 0.4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20119082A JPS5991653A (en) | 1982-11-18 | 1982-11-18 | Low pressure mercury vapor electric-discharge tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20119082A JPS5991653A (en) | 1982-11-18 | 1982-11-18 | Low pressure mercury vapor electric-discharge tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5991653A true JPS5991653A (en) | 1984-05-26 |
Family
ID=16436836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20119082A Pending JPS5991653A (en) | 1982-11-18 | 1982-11-18 | Low pressure mercury vapor electric-discharge tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5991653A (en) |
-
1982
- 1982-11-18 JP JP20119082A patent/JPS5991653A/en active Pending
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