JP3671686B2

JP3671686B2 - Electrodeless discharge lamp device

Info

Publication number: JP3671686B2
Application number: JP24016598A
Authority: JP
Inventors: 正平山本
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 1998-08-26
Filing date: 1998-08-26
Publication date: 2005-07-13
Anticipated expiration: 2018-08-26
Also published as: JP2000067818A

Description

【０００１】
【発明の属する技術分野】
本発明は高周波電源回路からの高周波電力を無電極放電灯バルブの近傍に配置させたコイルに供給し高周波電磁界を誘起して、バルブを点灯させる無電極放電灯装置に関するものである。
【０００２】
【従来の技術】
（従来例１）
無電極放電灯装置の始動改善に関する従来例としては、特開平１０−２２０８６号がある。図１２に本従来例を示す。この無電極放電灯装置は、バルブ１と、第１コイル３と、点灯装置４、及び補助コイル６とを備えて構成されている。透光性部材により気密で略球状をなすように形成された透光性バルブ１の一方側に、略円筒状の凹部２が形成されており、その透光性バルブ１の内部には、不活性ガスや金属蒸気を含む放電ガスが封入されている。また、その周には、巻数が特に限定されるものではないが、３ターンの巻数の第１コイル３が、その巻回中心軸が凹部２の中心軸と略平行となるように巻回されており、また、凹部２にはフェライトコアなどの鉄芯５に巻回された補助コイル６が、第１コイル３と中心軸が略平行、または略一致するように収容されている。なお、第１コイル３の巻回中心軸が凹部２の中心軸と平行ではなく、補助コイル６と中心軸が一致しなくても良い。
【０００３】
点灯装置４は、第１コイル３に高周波電流を流すための第１の高周波発生回路４ａと、補助コイル６に高周波電流を流すための第２の高周波発生回路４ｂとを備えて構成されている。そして、第１コイル３は、第１の高周波発生回路４ａから高周波電流が通電されることにより高周波磁界を発生し、この高周波磁界がバルブ１の内部の放電ガスに作用することにより環状放電を生じさせ、放電ガスを励起することにより発光を生じさせる。すなわち、高周波磁界によってバルブ１の内部には環状の誘導電界が生ずるのであり、この誘導電界によりバルブ１の内部の放電ガスが電離して環状放電が生ずるのである。また、補助コイル６は、第２の高周波発生回路４ｂから高周波電流が通電されて、第１コイル３と同様に、周囲に高周波磁界を発生させるものであって、第１コイル３と同様にして予備放電となる環状放電を生じさせるようにされている。ここに、補助コイル６は第１コイル３よりも小径であって、予備放電として生ずる環状放電は、第１コイル３によって生じる環状放電よりも小形になる。したがって、第２の高周波発生回路４ｂから補助コイル６への供給エネルギを、第１の高周波発生回路４ａから第１コイル３への供給エネルギより小さくすることができ、始動性を改善することができる。
【０００４】
（従来例２）
図１３に無電極放電灯点灯装置の別の従来例（特開平９−３２０５４０号）を示す。この点灯装置においては、コイル２０の一端が高周波電源の一端につながれ、高周波電源の他端はコイル２０の中間付近２３で接続されている。前記特開平９−３２０５４０号において、先端２４と高周波電源の供給点２３の間の電界は供給点２２、２３との間で発生する軸方向の高周波電界の方向と反対になり、放射電界が打ち消される効果があると述べられている。ここで、本従来例は１つのコイル２０を用い、コイル２０の一端２２が高周波電源の一端につながれ、高周波電源の他端がコイル２０の中間付近２３で接続されているとある。しかしこれは、図１４に示すように、第１コイル３と第２コイル６とを用い、第１コイル３と第２コイル６とを磁気的に結合し、かつ、第１コイル３の端３ａ、３ｂを高周波電源４に接続し、第１コイル３の第２端３ｂと第２コイル６の第１端６ａを接続したものと電気的には等価であると考えられる。従来例１での供給点２２は第１コイル３の第１端３ａ、供給点２２は第１コイル３の第２端３ｂおよび第２コイル６の第１端６ａの接続点にそれぞれ相当する。また、従来例１での先端２４は、第２コイル６の第２端６ｂに相当する。
【０００５】
ところで、前記特開平９−３２０５４０号において先端２４の位置に関する記述はない。放射電界を打ち消す作用を達成するためには、先端２４の位置は高周波電源の供給点２２、２３に近接してあると考えられる。これは図１３内に示されている。また、前記特開平９−３２０５４０号において無電極放電灯の始動に関する記述はない。
【０００６】
【発明が解決しようとする課題】
前記したように、従来例１の構成においては、補助コイル６へのエネルギ供給のために、第２の高周波発生回路４ｂが必要となる。また、第２の高周波発生回路４ｂが簡単な回路構成で実現できても、バルブ１近辺には電力供給線が２組必要となり、無電極放電灯点灯装置の構成が複雑になる。
【０００７】
ところで、図１２の無電極放電灯装置において、第１コイル３により環状の誘導電界を発生させておけば、バルブ１内には種となる放電ガスの電離を起こすだけで、環状放電が形成されることが分かっている。すなわち、静電結合によってバルブ１内に電界を生じても、種となる放電ガスの電離が起こり環状放電が形成されランプを始動させることができる。この静電結合によってバルブ１内に電界を生じる場合、電圧を印加させれば良く、電流はほとんど必要としない。結果として、種となる放電ガスを電離させるのに必要な電力は極めて少なくて良い。
【０００８】
この点を従来例２において考察する。前述したとおり、従来例２はノイズの低減という観点で記述されており、始動性に関する記述はない。このため、従来例２で始動性がどのようになるかを考察する。従来例２の構成において、結果的に先端２４と供給点２２との間には、高周波電源によって印加されるより高い電圧が発生する。しかし、この高い電圧は、主としてくぼみ部内に電界を生じるだけで、放電ガスを電離させるのには有効ではない。従って、放電ガスを電離させるには、先端２４に比較的高い電圧を発生させなければならず、コイルの絶縁設計が難しいばかりでなく、ノイズの発生量も増大させる恐れがある。
【０００９】
本発明は、前記問題点に鑑みてなされたものであり、その目的とするところは、構成が簡単で始動性の良い無電極放電灯装置を提供することにある。
【００１０】
【課題を解決するための手段】
本発明にあっては、上記の課題を解決するために、図１に示すように、放電ガスが封入されたバルブ１と、前記バルブに設けられたくぼみ部２と、前記くぼみ部に収納されて高周波電磁界を発生させる第１コイル３と、前記第１コイルに高周波電力を供給する高周波電源４と、前記第１コイルに包囲されたコア５と、前記第１コイル３に磁気的に結合された第２コイル６とからなり、前記第２コイル６の第１端６ａを前記第１コイル３の第２端３ｂに接続した無電極放電灯装置において、第２コイル６の第２端６ｂを少なくとも前記バルブ１と前記くぼみ部２との接続部９より外側まで延在しているとともに、少なくとも点弧状態において、第２コイル６の第１端６ａから第２端６ｂに向けて生ずる電圧が、前記第１コイル３の第１端３ａから第２端３ｂに向けて生ずる電圧と同じ極性を持つことを特徴とするものである。
【００１１】
本発明によれば、高周波電源４によって第１コイル３に高周波電力が供給される。これにより、第１コイル３に磁気的に接続された第２コイル６に電圧が発生する。この結果、第２コイル６の第２端６ｂと第１コイルの第１端３ａの間には、高周波電源４によって供給される電圧より大きな電位差が生じる。ここで、第２コイル６の第２端６ｂを、第１コイル３の第１端３ａの収容されているくぼみ部２の外に設けることで、第２コイル６の第２端６ｂと第１コイル３の第１端３ａの間に生じる高い電位差による電界が、バルブ１の放電ガスの封入された部分を横切り、バルブ１内の放電ガスを有効的に電離することができるようになる。この電離を種として、第１コイル３による電界によって環状放電が形成される。環状放電の種となるように、バルブ１内の放電ガスの電離を有効的に行うことができるために、第２コイル６の第２端６ｂと第１コイル３の第１端３ａとの間に必要な電圧は小さくて済む。この結果、第２コイル６に必要な電圧を低減することができ、コイル間の絶縁設計や、第２コイル６から発生するノイズを抑えるための構成が簡単になる。これにより、構成が簡単で始動性の良い無電極放電灯装置が提供される。
【００１２】
【発明の実施の形態】
（実施例１）
図１は請求項１の発明を示したものである。放電ガスが封入されたバルブ１と、前記バルブに設けられたくぼみ部２と、前記くぼみ部に収納された高周波電磁界を発生させる第１コイル３と、前記第１コイルに高周波電力を供給する高周波電源４と、前記第１コイルに包囲されたコア５と、前記第１コイル３に磁気的に結合された第２コイル６とからなり、前記第２コイル６の第１端６ａを前記第１コイル３の第２端３ｂに接続した無電極放電灯装置において、第２コイル６の第２端６ｂは、前記バルブ１と前記くぼみ部２との接続部９を通って、くぼみ部２より外側まで延在しているとともに、少なくとも点弧状態において、第２コイル６の第１端６ａから第２端６ｂに向けて生ずる電圧が、前記第１コイル３の第１端３ａから第２端３ｂに向けて生ずる電圧と同じ極性を持つことを特徴とするものである。第２コイル６の第２端６ｂを、くぼみ部２の外側におくことで、高い電位差を持つ第１コイル３の第１端３ａとの間に、バルブ１の放電ガスの封入された部分を電界が横切り、バルブ１内の放電ガスを有効的に電離できるようになる。したがって、構成が簡単で、ランプ始動容易な無電極放電灯が実現できる。
【００１３】
（実施例２）
図２は請求項２の発明を示したものである。構成は図１に示したものと同一であるが、第２コイル６ａの第２端６ｂを、近接点８でバルブ１に近接させることで、より有効的にバルブ１内の放電ガスを電離できるようになる。これにより、第２コイル６の両端６ａ、６ｂに生じる電圧を低く設定することができるので、第２コイル６の巻数を少なくしたり、第１コイル３との磁気的な結合を小さく設定できるなど、第２コイルの設計に自由度が増す効果がある。
【００１４】
（実施例３）
図３は請求項３の発明を示したものである。構成は図２に示したものに加え、金属で作成した近接点８に第２コイル６の第２端６ｂを接続してある。これにより、バルブ１に第２コイル６の第２端６ｂの電圧をかけやすくなるとともに、近接点８の固定が容易になるという効果がある。また、近接点８を板状または箔状に形成すると、広い面積でバルブ１に接触することができ、より近接点８の固定が容易になるとともに、有効的にバルブ１内の放電ガスを電離できるようになる。
【００１５】
（実施例４）
図４は請求項４の発明を示したものである。構成は図２に示したものに加え、透明導電膜で作成した近接点８に第２コイル６の第２端６ｂを接続してある。これにより、バルブ１に第２コイル６の第２端６ｂの電圧をかけやすくなるとともに、広い面積でバルブ１に接触することができ、近接点８の固定が容易になるとともに、有効的にバルブ１内の放電ガスを電離できるようになるという効果がある。また、透明導電膜であるので、点灯中にバルブ上１に陰が生じないという効果もある。
【００１６】
（実施例５）
図５は請求項６の発明を示したものである。構成は図１に示したものにおいて、バルブ１を貫通する導入部材をくぼみ部２に設け、第２コイル６の第２端６ｂは、前記導入部材を介して、くぼみ部２より外側に延在している。これにより、第２コイル６の第２端６ｂは、くぼみ部２の入り口部分を通らずに、くぼみ部２の外側に延ばすことができる。くぼみ部２の入り口部分には、高周波電源４からの電源供給線や、バルブ１を器具に固定するための治具などが設けられるので構造設計が難しい。本発明により、電源供給線からの絶縁が容易であり、くぼみ部２の入り口の構造設計が複雑でない無電極放電灯が実現できる。
【００１７】
（実施例６）
図６は請求項７の発明を示したものである。構成は図３に示したものに加え、金属でできた近接点８をバルブ１上に複数個設けてある。これにより、より近接点８の１箇所の面積を大きくすることなく有効的にバルブ１内の放電ガスを電離できるようになるので、点灯中にバルブ１に生じる陰が目立ちにくくなるという効果がある。また、本実施例では第２コイル６の第２端６ｂは、くぼみ部２の入り口を通ってくぼみ部２の外に通じているが、実施例５のように、バルブ１を貫通する導入部材を設けて、この導入部材を通してくぼみ部２の外に通じても良い。また、近接点８は金属の代わりに透明導電膜を使用しても良い。
【００１８】
（実施例７）
図７は請求項８の発明を示したものである。構成は図３に示したものに加え、第１コイル３の第１端３ａを、主電源の導入線にコンデンサＣを介して接続してある。この結果、第１コイル３の第１端３ａの電位が安定的になり、逆に、第２コイル６の第２端６ｂの電位は筺体などに対して大きな振幅を持つようになる。これにより、バルブ１近辺の多くの部位が第２コイル６の第２端６ｂと大きな電位差を有するようになり、高い電界がバルブ１の放電ガスにかかりやすくなり、ランプの始動性が向上する。
【００１９】
（実施例８）
図８は請求項９の発明を示したものである。構成は図３に示したものに加え、第１コイル３の第２端３ｂを、主電源の導入線にコンデンサＣを介して接続してある。この結果、ランプ始動に関わる第２コイル６の第２端６ｂと第１コイル３の第１端３ａの間の電位差に比べて、第２コイル６の第２端６ｂと安定電位との間の電位差は小さくなる。したがって、無電極放電灯点灯装置から発生するノイズが削減されるという効果がある。
【００２０】
（実施例９）
図９は請求項１０の発明を示したものである。構成は図３に示したものに加え、第２コイル６の第１端６ａと第１コイル３の第２端３ｂとの間にスイッチ７を設けている。このスイッチ７を点弧時にはオンにしておき、ランプ点灯後にオフにする動作をさせる。これにより、ランプ点灯後には、第２コイル６が第１コイル３と切り離され、放射されるノイズが減少するという効果がある。
【００２１】
（実施例１０）
図１０は請求項１１の発明を示したものである。構成は図３に示したものに加え、第２コイル６の第２端６ｂと近接点８との接続点の間にスイッチ７を設けている。このスイッチ７を点弧時にはオンにしておき、ランプ点灯後にオフにする動作をさせる。これにより、ランプ点灯後には、近接点８が電気的に切り離され、放射されるノイズが減少するという効果がある。
【００２２】
このとき、スイッチ７をくぼみ部２内に設けておけば、くぼみ部２より外側で放射されるノイズが減るという効果がある。また逆に、スイッチ７をくぼみ部２の外に設けておけば、スイッチ７をくぼみ部２内の高温から避けることができ、装置の信頼性が増す。また同時に、くぼみ部２内に含まれる回路素子が減り、くぼみ部２付近の構造設計が楽になるという効果も持つ。
【００２３】
（実施例１１）
図１１は請求項１２の発明を示したものである。構成は図４に示したものに加え、第１コイル３と第２コイル６との磁気的な結合を変化させる手段を有する。ここでは、第２コイル６の巻かれた部分のコア５ｂの透磁率を、ランプ点灯後に低下させることで実現している。これは例えば、ランプ点灯による温度上昇を検知して透磁率を変化させることで実現できる。点弧時には結合を高く、点灯後には結合を低くなるように変化させる。これにより、点灯後、第２コイル６に発生する電圧が低くなり、ノイズが減少するという効果がある。また、コア５の第１コイル３の巻かれた部分に発生した磁束が通りにくいように、コア５の第２コイル６の巻かれた部分と距離を離す手段を設けても良いし、コア５の第２コイル６の巻かれた部分との間に磁気的なシールドを設けても同様の効果が得られる。
【００２４】
【発明の効果】
本発明によれば、第１コイルに磁気的に結合した第２コイルを設けると共に第２コイルの第２端をくぼみ部の外側にまで延在させることにより、第２コイルの第２端と第１コイルの第１端との間の高電界を、バルブの放電ガスの封入された部分を横切るように発生させることができるので、バルブ内の放電ガスを有効的に電離することができるようになる。この結果、第２コイルに必要な電圧を低減することができ、コイル間の絶縁設計や、第２コイルから発生するノイズを抑えるための構成が簡単になる。これにより、構成が簡単で始動性の良い無電極放電灯装置が提供される。
【図面の簡単な説明】
【図１】請求項１の無電極放電灯の概略構成図である。
【図２】請求項２の無電極放電灯の概略構成図である。
【図３】請求項３の無電極放電灯の概略構成図である。
【図４】請求項４の無電極放電灯の概略構成図である。
【図５】請求項６の無電極放電灯の概略構成図である。
【図６】請求項７の無電極放電灯の概略構成図である。
【図７】請求項８の無電極放電灯の概略構成図である。
【図８】請求項９の無電極放電灯の概略構成図である。
【図９】請求項１０の無電極放電灯の概略構成図である。
【図１０】請求項１１の無電極放電灯の概略構成図である。
【図１１】請求項１２の無電極放電灯の概略構成図である。
【図１２】従来例１の概略構成図である。
【図１３】従来例２の断面図である。
【図１４】従来例２の等価回路図である。
【符号の説明】
１バルブ
２くぼみ部
３第１コイル
４高周波電源
５コア
６第２コイル[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrodeless discharge lamp apparatus for supplying a high frequency power from a high frequency power supply circuit to a coil arranged in the vicinity of an electrodeless discharge lamp bulb to induce a high frequency electromagnetic field to light the bulb.
[0002]
[Prior art]
(Conventional example 1)
Japanese Patent Laid-Open No. 10-22086 is a conventional example related to the improvement in starting of the electrodeless discharge lamp device. FIG. 12 shows this conventional example. This electrodeless discharge lamp device includes a bulb 1, a first coil 3, a lighting device 4, and an auxiliary coil 6. A substantially cylindrical recess 2 is formed on one side of a light-transmitting bulb 1 formed so as to be airtight and substantially spherical by a light-transmitting member. A discharge gas containing an active gas and metal vapor is enclosed. Further, the number of turns is not particularly limited around the circumference, but the first coil 3 having the number of turns of 3 turns is wound so that the winding center axis is substantially parallel to the center axis of the recess 2. In addition, an auxiliary coil 6 wound around an iron core 5 such as a ferrite core is accommodated in the recess 2 so that the first coil 3 and the central axis are substantially parallel or substantially coincident with each other. Note that the winding central axis of the first coil 3 is not parallel to the central axis of the recess 2, and the auxiliary coil 6 and the central axis may not coincide with each other.
[0003]
The lighting device 4 includes a first high-frequency generation circuit 4a for flowing a high-frequency current through the first coil 3 and a second high-frequency generation circuit 4b for flowing a high-frequency current through the auxiliary coil 6. . The first coil 3 generates a high-frequency magnetic field when a high-frequency current is applied from the first high-frequency generation circuit 4a, and the high-frequency magnetic field acts on the discharge gas inside the bulb 1 to generate an annular discharge. And light emission is generated by exciting the discharge gas. That is, an annular induction electric field is generated inside the bulb 1 by the high-frequency magnetic field, and the discharge gas inside the bulb 1 is ionized by the induction electric field to generate an annular discharge. In addition, the auxiliary coil 6 is supplied with a high-frequency current from the second high-frequency generation circuit 4 b and generates a high-frequency magnetic field around the same as the first coil 3. An annular discharge serving as a preliminary discharge is generated. Here, the auxiliary coil 6 has a smaller diameter than the first coil 3, and the annular discharge generated as the preliminary discharge is smaller than the annular discharge generated by the first coil 3. Accordingly, the supply energy from the second high frequency generation circuit 4b to the auxiliary coil 6 can be made smaller than the supply energy from the first high frequency generation circuit 4a to the first coil 3, and the startability can be improved. .
[0004]
(Conventional example 2)
FIG. 13 shows another conventional example of an electrodeless discharge lamp lighting device (Japanese Patent Laid-Open No. 9-320540). In this lighting device, one end of the coil 20 is connected to one end of the high-frequency power source, and the other end of the high-frequency power source is connected near the middle 23 of the coil 20. In Japanese Patent Laid-Open No. 9-320540, the electric field between the tip 24 and the high-frequency power supply point 23 is opposite to the direction of the axial high-frequency electric field generated between the supply points 22 and 23, and the radiation electric field is canceled out. It is said that there is an effect. Here, in this conventional example, one coil 20 is used, one end 22 of the coil 20 is connected to one end of the high-frequency power source, and the other end of the high-frequency power source is connected in the middle vicinity 23 of the coil 20. However, as shown in FIG. 14, the first coil 3 and the second coil 6 are used, the first coil 3 and the second coil 6 are magnetically coupled, and the end 3a of the first coil 3 is used. 3b is connected to the high-frequency power source 4 and is considered to be electrically equivalent to the connection between the second end 3b of the first coil 3 and the first end 6a of the second coil 6. The supply point 22 in Conventional Example 1 corresponds to the first end 3 a of the first coil 3, and the supply point 22 corresponds to the connection point of the second end 3 b of the first coil 3 and the first end 6 a of the second coil 6. Further, the tip 24 in Conventional Example 1 corresponds to the second end 6 b of the second coil 6.
[0005]
Incidentally, there is no description regarding the position of the tip 24 in the Japanese Patent Laid-Open No. 9-320540. In order to achieve the action of canceling the radiation electric field, the position of the tip 24 is considered to be close to the supply points 22 and 23 of the high-frequency power source. This is shown in FIG. Moreover, there is no description about the start of an electrodeless discharge lamp in said Unexamined-Japanese-Patent No. 9-320540.
[0006]
[Problems to be solved by the invention]
As described above, in the configuration of Conventional Example 1, the second high-frequency generation circuit 4b is required for supplying energy to the auxiliary coil 6. Even if the second high frequency generating circuit 4b can be realized with a simple circuit configuration, two sets of power supply lines are required in the vicinity of the bulb 1, and the configuration of the electrodeless discharge lamp lighting device becomes complicated.
[0007]
By the way, in the electrodeless discharge lamp apparatus of FIG. 12, if an annular induction electric field is generated by the first coil 3, an annular discharge is formed in the bulb 1 only by ionizing the discharge gas as a seed. I know that. That is, even if an electric field is generated in the bulb 1 due to electrostatic coupling, the discharge gas as a seed is ionized, an annular discharge is formed, and the lamp can be started. When an electric field is generated in the bulb 1 by this electrostatic coupling, a voltage may be applied and little current is required. As a result, very little power is required to ionize the seed discharge gas.
[0008]
This point will be considered in Conventional Example 2. As described above, Conventional Example 2 is described in terms of noise reduction, and there is no description regarding startability. For this reason, it will be considered how the startability becomes in the conventional example 2. In the configuration of Conventional Example 2, as a result, a higher voltage is generated between the tip 24 and the supply point 22 than is applied by the high frequency power supply. However, this high voltage mainly produces an electric field in the indentation and is not effective for ionizing the discharge gas. Therefore, in order to ionize the discharge gas, a relatively high voltage must be generated at the tip 24, which not only makes the coil insulation design difficult, but also may increase the amount of noise generated.
[0009]
The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrodeless discharge lamp device having a simple configuration and good startability.
[0010]
[Means for Solving the Problems]
In the present invention, in order to solve the above-described problem, as shown in FIG. 1, a bulb 1 in which a discharge gas is sealed, a hollow portion 2 provided in the bulb, and a hollow portion are accommodated. A first coil 3 for generating a high-frequency electromagnetic field, a high-frequency power source 4 for supplying high-frequency power to the first coil, a core 5 surrounded by the first coil, and a magnetic coupling to the first coil 3 In the electrodeless discharge lamp apparatus, the second end 6b of the second coil 6 is connected to the second end 3b of the first coil 3 by connecting the first end 6a of the second coil 6 to the second end 3b of the first coil 3. Is generated from the first end 6a to the second end 6b of the second coil 6 at least in the ignition state, extending at least outside the connecting portion 9 between the valve 1 and the recessed portion 2. Is the first end 3a of the first coil 3? It is characterized in that having the same polarity as the voltage generated toward the second end 3b.
[0011]
According to the present invention, high frequency power is supplied to the first coil 3 by the high frequency power supply 4. As a result, a voltage is generated in the second coil 6 magnetically connected to the first coil 3. As a result, a potential difference larger than the voltage supplied by the high frequency power supply 4 is generated between the second end 6b of the second coil 6 and the first end 3a of the first coil. Here, the second end 6b of the second coil 6 is provided outside the recess 2 in which the first end 3a of the first coil 3 is accommodated, so that the second end 6b of the second coil 6 and the first end 6b An electric field due to a high potential difference generated between the first ends 3a of the coils 3 can cross the portion of the bulb 1 where the discharge gas is sealed, and can effectively ionize the discharge gas in the bulb 1. Using this ionization as a seed, an annular discharge is formed by the electric field generated by the first coil 3. In order to effectively perform ionization of the discharge gas in the bulb 1 so as to be a seed of the annular discharge, between the second end 6 b of the second coil 6 and the first end 3 a of the first coil 3. The voltage required for this is small. As a result, the voltage required for the second coil 6 can be reduced, and the insulation design between the coils and the configuration for suppressing noise generated from the second coil 6 are simplified. As a result, an electrodeless discharge lamp device having a simple configuration and good startability is provided.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
(Example 1)
FIG. 1 shows the invention of claim 1. A high-frequency power is supplied to the first coil, a bulb 1 in which discharge gas is sealed, a hollow portion 2 provided in the bulb, a first coil 3 for generating a high-frequency electromagnetic field housed in the hollow portion, and the first coil. A high frequency power source 4, a core 5 surrounded by the first coil, and a second coil 6 magnetically coupled to the first coil 3, the first end 6 a of the second coil 6 being connected to the first coil 6. In the electrodeless discharge lamp device connected to the second end 3 b of the one coil 3, the second end 6 b of the second coil 6 passes through the connecting portion 9 between the bulb 1 and the recessed portion 2, and is from the recessed portion 2. The voltage generated from the first end 6a of the second coil 6 toward the second end 6b is extended from the first end 3a of the first coil 3 to the second end at least in the ignition state. Having the same polarity as the voltage generated towards 3b It is an butterfly. By placing the second end 6b of the second coil 6 outside the recessed portion 2, the portion of the bulb 1 in which the discharge gas is sealed is placed between the first end 3a of the first coil 3 having a high potential difference. The electric field crosses and the discharge gas in the bulb 1 can be effectively ionized. Therefore, an electrodeless discharge lamp having a simple configuration and easy lamp start can be realized.
[0013]
(Example 2)
FIG. 2 shows the invention of claim 2. Although the configuration is the same as that shown in FIG. 1, the discharge gas in the bulb 1 can be ionized more effectively by bringing the second end 6 b of the second coil 6 a closer to the bulb 1 at the proximity point 8. It becomes like this. Thereby, since the voltage generated at both ends 6a and 6b of the second coil 6 can be set low, the number of turns of the second coil 6 can be reduced, or the magnetic coupling with the first coil 3 can be set small. The second coil design has the effect of increasing the degree of freedom.
[0014]
(Example 3)
FIG. 3 shows the invention of claim 3. In addition to the configuration shown in FIG. 2, the second end 6b of the second coil 6 is connected to the proximity point 8 made of metal. As a result, it is easy to apply the voltage at the second end 6b of the second coil 6 to the valve 1, and the proximity point 8 can be easily fixed. Further, when the proximity point 8 is formed in a plate shape or a foil shape, it is possible to contact the bulb 1 in a wide area, and the proximity point 8 can be fixed more easily and the discharge gas in the bulb 1 can be effectively ionized. become able to.
[0015]
(Example 4)
FIG. 4 shows the invention of claim 4. In addition to the configuration shown in FIG. 2, the second end 6b of the second coil 6 is connected to a proximity point 8 made of a transparent conductive film. As a result, the voltage of the second end 6b of the second coil 6 can be easily applied to the valve 1, and the valve 1 can be brought into contact with a wide area, the proximity point 8 can be easily fixed, and the valve can be effectively used. There is an effect that the discharge gas in 1 can be ionized. Moreover, since it is a transparent conductive film, there is also an effect that no shade is generated on the bulb 1 during lighting.
[0016]
(Example 5)
FIG. 5 shows the invention of claim 6. In the configuration shown in FIG. 1, an introduction member penetrating the valve 1 is provided in the recess portion 2, and the second end 6b of the second coil 6 extends outside the recess portion 2 through the introduction member. doing. As a result, the second end 6 b of the second coil 6 can extend outside the recessed portion 2 without passing through the entrance portion of the recessed portion 2. The entrance portion of the indented portion 2 is provided with a power supply line from the high-frequency power source 4, a jig for fixing the valve 1 to the instrument, and so on, so that the structural design is difficult. According to the present invention, it is possible to realize an electrodeless discharge lamp that can be easily insulated from the power supply line and the structure design of the entrance of the recessed portion 2 is not complicated.
[0017]
(Example 6)
FIG. 6 shows the invention of claim 7. In addition to the configuration shown in FIG. 3, a plurality of proximity points 8 made of metal are provided on the valve 1. As a result, the discharge gas in the bulb 1 can be effectively ionized without increasing the area of one of the proximity points 8, so that the shadow generated in the bulb 1 during lighting is less noticeable. . In the present embodiment, the second end 6b of the second coil 6 passes through the entrance of the recessed portion 2 and communicates with the outside of the recessed portion 2. However, as in the fifth embodiment, the introduction member penetrates the valve 1. May be provided and communicated to the outside of the indented portion 2 through the introduction member. The proximity point 8 may use a transparent conductive film instead of metal.
[0018]
(Example 7)
FIG. 7 shows the invention of claim 8. In addition to the configuration shown in FIG. 3, the first end 3a of the first coil 3 is connected to the main power supply line via a capacitor C. As a result, the potential of the first end 3a of the first coil 3 becomes stable, and conversely, the potential of the second end 6b of the second coil 6 has a large amplitude with respect to the housing or the like. As a result, many parts in the vicinity of the bulb 1 have a large potential difference with the second end 6b of the second coil 6, a high electric field is easily applied to the discharge gas of the bulb 1, and the startability of the lamp is improved.
[0019]
(Example 8)
FIG. 8 shows the invention of claim 9. In addition to the configuration shown in FIG. 3, the second end 3b of the first coil 3 is connected to the main power supply line via a capacitor C. As a result, compared to the potential difference between the second end 6b of the second coil 6 and the first end 3a of the first coil 3 involved in the lamp start, it is between the second end 6b of the second coil 6 and the stable potential. The potential difference becomes smaller. Therefore, there is an effect that noise generated from the electrodeless discharge lamp lighting device is reduced.
[0020]
Example 9
FIG. 9 shows the invention of claim 10. In addition to the configuration shown in FIG. 3, a switch 7 is provided between the first end 6 a of the second coil 6 and the second end 3 b of the first coil 3. The switch 7 is turned on at the time of ignition and is turned off after the lamp is lit. Thereby, after the lamp is lit, the second coil 6 is disconnected from the first coil 3 and the radiated noise is reduced.
[0021]
(Example 10)
FIG. 10 shows the invention of claim 11. In addition to the configuration shown in FIG. 3, a switch 7 is provided between the connection points between the second end 6 b of the second coil 6 and the proximity point 8. The switch 7 is turned on at the time of ignition and is turned off after the lamp is lit. Thereby, after the lamp is lit, the proximity point 8 is electrically disconnected, and the radiated noise is reduced.
[0022]
At this time, if the switch 7 is provided in the recessed portion 2, there is an effect that noise radiated outside the recessed portion 2 is reduced. Conversely, if the switch 7 is provided outside the recessed portion 2, the switch 7 can be avoided from the high temperature in the recessed portion 2, and the reliability of the apparatus is increased. At the same time, there is an effect that the number of circuit elements contained in the recessed portion 2 is reduced, and the structural design in the vicinity of the recessed portion 2 becomes easy.
[0023]
(Example 11)
FIG. 11 shows the invention of claim 12. The configuration includes means for changing the magnetic coupling between the first coil 3 and the second coil 6 in addition to that shown in FIG. Here, this is realized by reducing the magnetic permeability of the core 5b where the second coil 6 is wound after the lamp is turned on. This can be realized, for example, by detecting a temperature rise due to lamp lighting and changing the magnetic permeability. The coupling is changed so as to be high at the time of ignition and low after lighting. Thereby, after lighting, the voltage generated in the second coil 6 is lowered, and the noise is reduced. Further, means for separating the distance from the portion of the core 5 around which the second coil 6 is wound may be provided so that the magnetic flux generated in the portion of the core 5 around which the first coil 3 is wound may be difficult. Even if a magnetic shield is provided between the portion where the second coil 6 is wound, the same effect can be obtained.
[0024]
【The invention's effect】
According to the present invention, a second coil magnetically coupled to the first coil is provided, and the second end of the second coil is extended to the outside of the indented portion, whereby the second end of the second coil and the second coil are Since a high electric field between the first end of one coil can be generated across the portion where the discharge gas of the bulb is sealed, the discharge gas in the bulb can be effectively ionized. Become. As a result, the voltage required for the second coil can be reduced, and the insulation design between the coils and the configuration for suppressing noise generated from the second coil are simplified. As a result, an electrodeless discharge lamp device having a simple configuration and good startability is provided.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an electrodeless discharge lamp according to claim 1;
FIG. 2 is a schematic configuration diagram of an electrodeless discharge lamp according to claim 2;
FIG. 3 is a schematic configuration diagram of an electrodeless discharge lamp according to claim 3;
FIG. 4 is a schematic configuration diagram of an electrodeless discharge lamp according to claim 4;
FIG. 5 is a schematic configuration diagram of an electrodeless discharge lamp according to claim 6;
FIG. 6 is a schematic configuration diagram of an electrodeless discharge lamp according to claim 7;
7 is a schematic configuration diagram of an electrodeless discharge lamp according to claim 8. FIG.
FIG. 8 is a schematic configuration diagram of an electrodeless discharge lamp according to claim 9;
9 is a schematic configuration diagram of an electrodeless discharge lamp according to claim 10. FIG.
FIG. 10 is a schematic configuration diagram of an electrodeless discharge lamp according to claim 11;
11 is a schematic configuration diagram of an electrodeless discharge lamp according to claim 12. FIG.
12 is a schematic configuration diagram of Conventional Example 1. FIG.
13 is a cross-sectional view of Conventional Example 2. FIG.
14 is an equivalent circuit diagram of Conventional Example 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve 2 Recessed part 3 1st coil 4 High frequency power supply 5 Core 6 2nd coil

Claims

A bulb in which a discharge gas is sealed; a recess provided in the bulb; a first coil that is housed in the recess to generate a high-frequency electromagnetic field; and a high-frequency power source that supplies high-frequency power to the first coil A core surrounded by the first coil and a second coil magnetically coupled to the first coil, wherein the first end of the second coil is connected to the second end of the first coil. In the electrodeless discharge lamp device, the second end of the second coil extends at least outside the connection portion between the bulb and the recess, and at least in the ignition state, from the first end of the second coil. The electrodeless discharge lamp device according to claim 1, wherein the voltage generated toward the second end has the same polarity as the voltage generated from the first end toward the second end of the first coil.

2. The electrodeless discharge lamp device according to claim 1, wherein the second end of the second coil is close to the bulb at a proximity point outside the connection portion between the bulb and the indented portion.

The electrodeless discharge lamp device according to claim 2, wherein the proximity point is made of metal and connected to the second end of the second coil.

The electrodeless discharge lamp device according to claim 2, wherein the proximity point is formed of a transparent conductive film and is connected to the second end of the second coil.

5. The second end of the second coil extends to the outside of the indented portion through a connection portion between the valve and the indented portion. 6. Electrodeless discharge lamp device.

The second end of the second coil passes through the valve using an introduction member provided in the valve and extends to the outside of the indented portion. The electrodeless discharge lamp device described.

The electrodeless discharge lamp device according to claim 1, wherein a plurality of the proximity points are provided on the bulb.

8. The electrodeless discharge lamp device according to claim 1, wherein the first end of the first coil is connected to one of the lead wires of the main power supply via an impedance element.

8. The electrodeless discharge lamp device according to claim 1, wherein the second end of the first coil is connected to one of the lead wires of the main power supply via an impedance element.

The electrodeless electrode according to any one of claims 1 to 9, wherein after the power is turned on, the connection between the first end of the second coil and the second end of the first coil is disconnected, and then a stable lighting state is obtained. Discharge lamp device.

The electrodeless discharge lamp device according to any one of claims 1 to 9, wherein after the power is turned on, the connection between the second end of the second coil and the proximity point is cut off, and then a stable lighting state is obtained. .

10. The electrodeless discharge lamp device according to claim 1, wherein the magnetic coupling between the first coil and the second coil is reduced after the power is turned on.

A bulb in which a discharge gas is sealed; a recess provided in the bulb; a first coil that is housed in the recess to generate a high-frequency electromagnetic field; and a high-frequency power source that supplies high-frequency power to the first coil A core surrounded by the first coil and a second coil magnetically coupled to the first coil, wherein the first end of the second coil is connected to the second end of the first coil. In the electrodeless discharge lamp apparatus, the second end of the second coil 6 is close to the bulb at least outside the connecting portion between the bulb and the recess, and at least in the ignition state, from the first end of the second coil. The electrodeless discharge lamp device according to claim 1, wherein the voltage generated toward the second end has the same polarity as the voltage generated from the first end toward the second end of the first coil.