JPH1027576A - Electrodeless discharge lamp - Google Patents
Electrodeless discharge lampInfo
- Publication number
- JPH1027576A JPH1027576A JP18346696A JP18346696A JPH1027576A JP H1027576 A JPH1027576 A JP H1027576A JP 18346696 A JP18346696 A JP 18346696A JP 18346696 A JP18346696 A JP 18346696A JP H1027576 A JPH1027576 A JP H1027576A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust pipe
- induction coil
- discharge lamp
- electrodeless discharge
- electromagnetic wave
- 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
- 230000006698 induction Effects 0.000 claims abstract description 32
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 13
- 230000005684 electric field Effects 0.000 claims description 14
- 239000004020 conductor Substances 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 230000004907 flux Effects 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 16
- 239000011521 glass Substances 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 5
- 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 3
- 230000000694 effects Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010849 ion bombardment Methods 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
Landscapes
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、放電ガスを封入し
た透光性材料よりなるバルブの内部に電極を持たず、バ
ルブ外部から放電ガスに対して高周波電磁界を作用させ
ることによって、放電ガスを励起発光させるようにした
無電極放電灯に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge gas by applying a high-frequency electromagnetic field to the discharge gas from the outside of the bulb without having electrodes inside the bulb made of a light-transmitting material filled with the discharge gas. The present invention relates to an electrodeless discharge lamp that emits excited light.
【０００２】[0002]
【従来の技術】従来より、バルブ内に封入した放電ガス
に高周波電磁界を作用させることによって、放電ガスを
励起して発光させるようにした無電極放電灯が知られて
いる。この種の無電極放電灯は、小型、高効率、長寿命
など特徴を有しているものであるため、各所で研究開発
がなされている。2. Description of the Related Art Conventionally, there has been known an electrodeless discharge lamp which excites a discharge gas to emit light by applying a high-frequency electromagnetic field to a discharge gas sealed in a bulb. This type of electrodeless discharge lamp has features such as small size, high efficiency, and long life, and is being researched and developed in various places.
【０００３】この種の無電極放電灯としては、図３に示
すように、電球形のバルブ１を誘導コイル２を囲む形状
に形成したものが知られている（特公昭５６−５０３８
５号公報参照）。バルブ１の中には水銀蒸気を含む放電
ガスが封入され、誘導コイル２に高周波電流を流すこと
により形成される高周波電磁界を放電ガスに作用させる
ことによって、放電ガスを励起して紫外線を発光させる
のである。また、バルブ１の内面には蛍光体被膜が形成
されており、放電ガスから放射された紫外線を可視光に
変換して照明に供する。As this type of electrodeless discharge lamp, as shown in FIG. 3, a bulb-shaped bulb 1 formed in a shape surrounding an induction coil 2 is known (Japanese Patent Publication No. 56-5038).
No. 5). A discharge gas containing mercury vapor is sealed in the bulb 1, and a high-frequency electromagnetic field formed by flowing a high-frequency current through the induction coil 2 acts on the discharge gas to excite the discharge gas and emit ultraviolet light. Let it do. In addition, a fluorescent film is formed on the inner surface of the bulb 1, and converts ultraviolet light emitted from the discharge gas into visible light for illumination.
【０００４】[0004]
【発明が解決しようとする課題】ところで、誘導コイル
２により形成される高周波電磁界は、誘導コイル２の外
部だけでなく内部（コイルの内側）にも形成され、誘導
コイル２の内部（誘導コイル２の中心軸）に位置する排
気管３にも高周波電磁界が印加され、排気管３の内部に
も放電プラズマが発生する。By the way, the high-frequency electromagnetic field formed by the induction coil 2 is formed not only outside the induction coil 2 but also inside (the inside of the coil) and inside the induction coil 2 (the induction coil 2). The high-frequency electromagnetic field is also applied to the exhaust pipe 3 positioned at the center axis of the exhaust pipe 2, and discharge plasma is also generated inside the exhaust pipe 3.
【０００５】排気管３は細管であるためプラズマ密度が
高くなり、排気管３は電子やイオンの強い衝撃により黒
化を招く。さらに、黒化は排気管３だけに収まらず、電
子やイオンの衝撃により排気管３のガラスからたたき出
されたナトリウムがバルブ１内に拡散し、バルブ１全体
の黒化を招くこともある。Since the exhaust pipe 3 is a thin tube, the plasma density increases, and the exhaust pipe 3 is blackened by strong impact of electrons and ions. Further, the blackening is not contained only in the exhaust pipe 3, and sodium blown out of the glass of the exhaust pipe 3 by the impact of electrons or ions may diffuse into the bulb 1, causing blackening of the entire bulb 1.
【０００６】本発明は、上記問題点を解決するためにな
されたもので、その目的とするところは、排気管の黒化
が少なく、光束維持率の良い無電極放電灯を提供するこ
とにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an electrodeless discharge lamp having less blackening of an exhaust pipe and a good luminous flux maintenance factor. .
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
本発明は、高周波電流が通電される誘導コイルと、その
誘導コイルを囲む形状を有するとともにコイル軸中心に
排気管を有し、内部に放電ガスが封入された透光性材料
よりなるバルブとを備え、誘導コイルにより形成される
高周波電磁界の作用により放電ガスを励起発光させる無
電極放電灯において、前記排気管の外面に導電性材料で
形成された電磁波シールドを設けたことを特徴とするも
のであり、このように構成することにより、誘導コイル
により形成された高周波電磁界が排気管の外面で遮断さ
れ、排気管内に密度の高いプラズマが発生しないため、
排気管の黒化を低減でき、光束維持率が向上する。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an induction coil through which a high-frequency current is supplied, a shape surrounding the induction coil, and an exhaust pipe at the center of the coil axis. A bulb made of a translucent material filled with a discharge gas, wherein the discharge gas is excited and emitted by the action of a high-frequency electromagnetic field formed by an induction coil. In this configuration, the high-frequency electromagnetic field formed by the induction coil is cut off on the outer surface of the exhaust pipe, and a high density electromagnetic wave is formed in the exhaust pipe. Because no plasma is generated,
Blackening of the exhaust pipe can be reduced, and the luminous flux maintenance rate improves.
【０００８】また、電磁波シールドに代えて排気管の内
面に保護膜を形成すれば、排気管内に密度の高いプラズ
マが発生しても、排気管を保護することができ、前記同
様の効果が得られる。Further, if a protective film is formed on the inner surface of the exhaust pipe instead of the electromagnetic wave shield, the exhaust pipe can be protected even if high-density plasma is generated in the exhaust pipe, and the same effect as described above can be obtained. Can be
【０００９】なお、電磁波シールドまたは保護膜に加
え、誘導コイルの外周に沿って導電性材で形成された電
界シールドを設けてもよい。さらに、電磁波シールドま
たは電界シールドのいずれか一方、もしくは双方にスリ
ット形成してもよい。In addition to the electromagnetic wave shield or the protective film, an electric field shield formed of a conductive material may be provided along the outer periphery of the induction coil. Further, a slit may be formed in one or both of the electromagnetic wave shield and the electric field shield.
【００１０】[0010]
【発明の実施の形態】図１は本発明に係る無電極放電灯
の一実施形態を示すものであり、この実施形態では、誘
導コイル２を囲む形に形成したバルブ１を用いている。
バルブ１はガラス等の透光性材料によって外観が球状に
形成されるとともに、その球体の中心部には円筒状の空
洞４が形成され、その空洞４の中心軸に沿うように排気
管３が形成されている。排気管３は気密空間を形成する
バルブ１と連通している。誘導コイル２は、後述の電界
シールド６を介して上記空洞４の底部近傍、つまりバル
ブ１の中心近傍に配設されている。FIG. 1 shows an embodiment of an electrodeless discharge lamp according to the present invention. In this embodiment, a bulb 1 formed so as to surround an induction coil 2 is used.
The bulb 1 is made of a translucent material such as glass and has a spherical appearance. A cylindrical cavity 4 is formed at the center of the sphere, and an exhaust pipe 3 is formed along the central axis of the cavity 4. Is formed. The exhaust pipe 3 communicates with the valve 1 forming an airtight space. The induction coil 2 is disposed near the bottom of the cavity 4, that is, near the center of the bulb 1 via an electric field shield 6 described later.
【００１１】ここで、上述の如きバルブ１の形成は、一
部に開口を有する球状体１ａと、その開口径と略同径で
一端開口の筒状体１ｂとを、それぞれの開口端同士を接
合することにより行う。なお、上記筒状体１ｂの底面に
は排気管３を構成するガラス管が予め設けられているの
は言うまでもないことである。Here, the bulb 1 as described above is formed by forming a spherical body 1a having an opening in a part and a cylindrical body 1b having a diameter substantially equal to the opening diameter and having an opening at one end. This is performed by joining. It goes without saying that a glass tube constituting the exhaust pipe 3 is provided in advance on the bottom surface of the cylindrical body 1b.
【００１２】バルブ１の内面（上記筒状体１ｂの外周面
と底面を含む）には蛍光体被膜５が形成されており、バ
ルブ１の内部には放電ガスとして、例えばアルゴンのよ
うな希ガスと水銀が封入されている。また、筒状体１ｂ
の内周面に沿って、例えばアルミニウムのような導電性
材料で形成された電界シールド６が設けられ、その電界
シールド６には縦方向、つまり筒軸方向にスリット（図
示せず）が設けられるとともに、口金７に接続し接地さ
れている。さらに、排気管３の外面には、例えばアルミ
ニウムのような導電性材料で形成された電磁波シールド
８が設けられ、口金７に接続し接地されている。A fluorescent film 5 is formed on the inner surface of the bulb 1 (including the outer peripheral surface and the bottom surface of the cylindrical body 1b). Inside the bulb 1, a rare gas such as argon is used as a discharge gas. And mercury are enclosed. Further, the cylindrical body 1b
An electric field shield 6 made of a conductive material such as aluminum is provided along an inner peripheral surface of the electric field shield, and a slit (not shown) is provided in the electric field shield 6 in a vertical direction, that is, a cylinder axis direction. At the same time, it is connected to the base 7 and grounded. Further, an electromagnetic wave shield 8 formed of a conductive material such as aluminum is provided on the outer surface of the exhaust pipe 3 and is connected to the base 7 and grounded.
【００１３】このように構成された無電極放電灯におい
て、誘導コイル２に高周波電流を通電すると、誘導コイ
ル２の周囲に形成される高周波電磁界がバルブ１内に封
入された放電ガスに作用し、放電プラズマが形成され、
水銀が励起されて紫外線を放射する。この紫外線は蛍光
体被膜５により可視光に変換される。In the electrodeless discharge lamp configured as described above, when a high-frequency current is applied to the induction coil 2, a high-frequency electromagnetic field formed around the induction coil 2 acts on the discharge gas sealed in the bulb 1. , A discharge plasma is formed,
Mercury is excited to emit ultraviolet light. This ultraviolet light is converted into visible light by the phosphor coating 5.
【００１４】ところで、誘導コイル２の近傍には強いプ
ラズマが発生するが、筒状体１ｂの内周面に沿って設け
た電界シールド６の作用により、電子やイオンの衝撃も
弱くなり、バルブ１内面の黒化を低減できる。また、電
界シールド６にはスリットが設けられるとともに接地さ
れているため、電界シールド６における渦電流損は少な
く、発光効率も良い。さらに、排気管３は電磁波シール
ド８で覆われているため、排気管３内に強いプラズマが
発生せず、排気管３の黒化も少ない。また、排気管３を
構成するガラスから電子やイオン衝撃によりたたき出さ
れたナトリウムも少ないため、光束維持率の改善も図れ
る。By the way, strong plasma is generated in the vicinity of the induction coil 2. However, the action of the electric field shield 6 provided along the inner peripheral surface of the cylindrical body 1b weakens the impact of electrons and ions, and the valve 1 Blackening of the inner surface can be reduced. Further, since the electric field shield 6 is provided with a slit and is grounded, eddy current loss in the electric field shield 6 is small and luminous efficiency is good. Further, since the exhaust pipe 3 is covered with the electromagnetic wave shield 8, no strong plasma is generated in the exhaust pipe 3 and the exhaust pipe 3 is hardly blackened. In addition, since sodium blown out of the glass constituting the exhaust pipe 3 by electron or ion bombardment is small, the luminous flux maintenance factor can be improved.
【００１５】なお、排気管３に設けた電磁波シールド８
に縦方向にスリットを形成することにより、電界シール
ドとしても同様の効果があり、この場合、渦電流損が少
なくなる。The electromagnetic wave shield 8 provided on the exhaust pipe 3
By forming a slit in the vertical direction, the electric field shield has the same effect, and in this case, eddy current loss is reduced.
【００１６】次に、図２は本発明の異なる実施形態を示
すもので、前記実施形態と異なる点は、前記電磁波シー
ルド８に代えて、排気管３の内面に保護膜９を形成した
ことで、他の構成は前記実施形態と同様であるので、同
等構成に同一符号を付すことにより説明を省略する。Next, FIG. 2 shows a different embodiment of the present invention. A different point from the above embodiment is that a protective film 9 is formed on the inner surface of the exhaust pipe 3 instead of the electromagnetic wave shield 8. Since the other configuration is the same as that of the above-described embodiment, the description is omitted by assigning the same reference numerals to the same configuration.
【００１７】このように構成したことにより、誘導コイ
ル２によって形成された高周波電磁界により排気管３内
に密度の高いプラズマが発生しても、プラズマから排気
管３を構成するガラスを保護することができる。従っ
て、排気管３の黒化を低減できるとともに、排気管３の
ガラスから電子やイオン衝撃によりたたき出されたナト
リウムも少ないため、光束維持率が向上する。With this configuration, even if a high-density plasma is generated in the exhaust pipe 3 by the high-frequency electromagnetic field generated by the induction coil 2, the glass constituting the exhaust pipe 3 is protected from the plasma. Can be. Accordingly, the blackening of the exhaust pipe 3 can be reduced, and the amount of sodium knocked out from the glass of the exhaust pipe 3 by electron or ion bombardment is small, so that the luminous flux maintenance rate is improved.
【００１８】[0018]
【発明の効果】本発明は上記のように、高周波電流が通
電される誘導コイルと、その誘導コイルを囲む形状を有
するとともにコイル軸中心に排気管を有し、内部に放電
ガスが封入された透光性材料よりなるバルブとを備え、
誘導コイルにより形成される高周波電磁界の作用により
放電ガスを励起発光させる無電極放電灯において、前記
排気管の外面に導電性材料で形成された電磁波シールド
を設けたことにより、誘導コイルにより形成された高周
波電磁界が排気管の外面で遮断され、排気管内に密度の
高いプラズマが発生しないため、排気管の黒化を低減で
き、光束維持率が向上する。As described above, the present invention has an induction coil through which a high-frequency current is supplied, a shape surrounding the induction coil, an exhaust pipe at the center of the coil axis, and a discharge gas enclosed therein. A valve made of a translucent material,
In an electrodeless discharge lamp that excites and emits a discharge gas by the action of a high-frequency electromagnetic field formed by an induction coil, an electromagnetic wave shield made of a conductive material is provided on the outer surface of the exhaust pipe, so that the discharge coil is formed by the induction coil. Since the high-frequency electromagnetic field is cut off on the outer surface of the exhaust pipe and high-density plasma is not generated in the exhaust pipe, blackening of the exhaust pipe can be reduced, and the luminous flux maintenance rate is improved.
【００１９】また、電磁波シールドに代えて排気管の内
面に保護膜を形成すれば、排気管内に密度の高いプラズ
マが発生しても、排気管を保護することができ、前記同
様の効果が得られる。If a protective film is formed on the inner surface of the exhaust pipe instead of the electromagnetic wave shield, the exhaust pipe can be protected even if high-density plasma is generated in the exhaust pipe, and the same effect as described above can be obtained. Can be
【図１】本発明の一実施形態を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the present invention.
【図２】本発明の異なる実施形態を示す断面図である。FIG. 2 is a sectional view showing a different embodiment of the present invention.
【図３】従来例を示す断面図である。FIG. 3 is a sectional view showing a conventional example.
１ バルブ ２ 誘導コイル ３ 排気管 ４ 空洞 ５ 蛍光体被膜 ６ 電界シールド ７ 口金 ８ 電磁波シールド ９ 保護膜 DESCRIPTION OF SYMBOLS 1 Valve 2 Induction coil 3 Exhaust pipe 4 Cavity 5 Phosphor coating 6 Electric field shield 7 Base 8 Electromagnetic wave shield 9 Protective film
Claims (5)
その誘導コイルを囲む形状を有するとともにコイル軸中
心に排気管を有し、内部に放電ガスが封入された透光性
材料よりなるバルブとを備え、誘導コイルにより形成さ
れる高周波電磁界の作用により放電ガスを励起発光させ
る無電極放電灯において、前記排気管の外面に導電性材
料で形成された電磁波シールドを設けたことを特徴とす
る無電極放電灯。An induction coil through which a high-frequency current flows,
It has a shape surrounding the induction coil, has an exhaust pipe at the center of the coil axis, and has a valve made of a translucent material in which a discharge gas is sealed, and is provided with a high frequency electromagnetic field formed by the induction coil. An electrodeless discharge lamp that excites and emits a discharge gas, wherein an electromagnetic wave shield made of a conductive material is provided on an outer surface of the exhaust pipe.
管の内面に保護膜を形成したことを特徴とする請求項１
記載の無電極放電灯。2. A protective film is formed on the inner surface of the exhaust pipe instead of the electromagnetic wave shield.
An electrodeless discharge lamp as described.
イルの外周に沿って導電性材で形成された電界シールド
を設けたことを特徴とする請求項１記載の無電極放電
灯。3. The electrodeless discharge lamp according to claim 1, further comprising an electric field shield formed of a conductive material along an outer periphery of said induction coil, in addition to said electromagnetic wave shield.
周に沿って導電性材で形成された電界シールドを設けた
ことを特徴とする請求項２記載の無電極放電灯。4. The electrodeless discharge lamp according to claim 2, further comprising an electric field shield formed of a conductive material along an outer periphery of said induction coil, in addition to said protective film.
のいずれか一方、もしくは双方にスリット形成したこと
を特徴とする請求項１、請求項３または請求項４のいず
れかに記載の無電極放電灯。5. The electrodeless discharge lamp according to claim 1, wherein a slit is formed in one or both of the electromagnetic wave shield and the electric field shield.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18346696A JP3424446B2 (en) | 1996-07-12 | 1996-07-12 | Electrodeless lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18346696A JP3424446B2 (en) | 1996-07-12 | 1996-07-12 | Electrodeless lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1027576A true JPH1027576A (en) | 1998-01-27 |
| JP3424446B2 JP3424446B2 (en) | 2003-07-07 |
Family
ID=16136289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18346696A Expired - Fee Related JP3424446B2 (en) | 1996-07-12 | 1996-07-12 | Electrodeless lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3424446B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6642671B2 (en) * | 2001-08-27 | 2003-11-04 | Matsushita Electric Industrial Co., Ltd. | Electrodeless discharge lamp |
-
1996
- 1996-07-12 JP JP18346696A patent/JP3424446B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6642671B2 (en) * | 2001-08-27 | 2003-11-04 | Matsushita Electric Industrial Co., Ltd. | Electrodeless discharge lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3424446B2 (en) | 2003-07-07 |
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