JPH10321194A - Electrodeless discharge lamp - Google Patents
Electrodeless discharge lampInfo
- Publication number
- JPH10321194A JPH10321194A JP13117097A JP13117097A JPH10321194A JP H10321194 A JPH10321194 A JP H10321194A JP 13117097 A JP13117097 A JP 13117097A JP 13117097 A JP13117097 A JP 13117097A JP H10321194 A JPH10321194 A JP H10321194A
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamp
- electrodeless discharge
- bulb
- diameter
- hollow cavity
- 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
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、高出力、長寿命
などの特徴を有しているので、各所で研究開発がなさ
れ、近年実用化されている。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. Since this kind of electrodeless discharge lamp has features such as small size, high output, and long life, it has been researched and developed in various places and has been put to practical use in recent years.
【０００３】図１４はその一例を示すもので、数トール
（Torr）のアルゴンと水銀を封入した電球形のバルブ１
に近接して配置した誘導コイル２に、高周波電源（図示
せず）から出力される１３．５６ＭＨｚの高周波電流を
通電し、発生する誘導電磁界でバルブ１内の水銀原子を
励起して２５４ｎｍの紫外線を放射し、この紫外線をバ
ルブ１の内面に塗布した蛍光体３に照射することにより
可視光を得るようにした無電極放電灯である。FIG. 14 shows an example of such a case, in which a bulb-shaped bulb 1 in which argon and mercury of several torr (Torr) are sealed.
A high-frequency current of 13.56 MHz output from a high-frequency power supply (not shown) is supplied to the induction coil 2 disposed in close proximity to the device, and the generated induction electromagnetic field excites mercury atoms in the bulb 1 to generate 254 nm. The electrodeless discharge lamp emits ultraviolet rays and irradiates the ultraviolet rays onto the phosphor 3 applied to the inner surface of the bulb 1 to obtain visible light.
【０００４】なお、同図において、４は導電体で構成さ
れた装置本体で、上記高周波電源などが収容されてお
り、ランプや高周波電源から発生する放射ノイズを除去
する。また、５は導電性メッシュで構成された電磁シー
ルド手段で、ランプからの照射光を透過すると共に、照
射面からのノイズ漏洩を防止する。In FIG. 1, reference numeral 4 denotes an apparatus main body made of a conductor, which houses the high-frequency power supply and the like, and removes radiation noise generated from a lamp and a high-frequency power supply. Numeral 5 is an electromagnetic shielding means formed of a conductive mesh, which transmits the light emitted from the lamp and prevents noise from leaking from the irradiated surface.
【０００５】このように構成された無電極放電灯は、バ
ルブ１内に電極を持たないため、電極切れの心配がな
く、長寿命であるという特徴を有する。The electrodeless discharge lamp thus configured does not have electrodes in the bulb 1 and thus has a feature that there is no fear of running out of electrodes and the life is long.
【０００６】また、異なる形状の無電極放電ランプとし
て、図１５に示すように、バルブ１の中心にくぼみ空洞
部を有し、そのくぼみ空洞部に誘導コイル２が配設され
たものが知られている（特公昭５６−５０３８５号公報
参照）。このランプの発光原理は、図１４に示す従来例
と同様、口金６の上部に配設された高周波電源７から出
力された高周波電流を誘導コイル２に通電し、発生する
誘導電磁界でバルブ１内の希ガスと水銀を発光させるも
のである。このような形状にすることで、誘導コイル２
が外部から見えず、外観に優れた無電極放電ランプとな
る。Further, as shown in FIG. 15, an electrodeless discharge lamp having a different shape has a hollow cavity at the center of a bulb 1 and an induction coil 2 is disposed in the hollow cavity. (See Japanese Patent Publication No. 56-50385). The light emission principle of this lamp is similar to that of the conventional example shown in FIG. 14, in which a high-frequency current output from a high-frequency power source 7 disposed above the base 6 is supplied to the induction coil 2 and the generated electromagnetic field is applied to the bulb 1. It emits noble gas and mercury inside. With such a shape, the induction coil 2
Are invisible from the outside, resulting in an electrodeless discharge lamp with excellent appearance.
【０００７】[0007]
【発明が解決しようとする課題】ところで、この種のバ
ルブの中心のくぼみ空洞部に誘導コイルが配設された無
電極放電ランプでは、ランプ点灯中、プラズマからの発
熱と誘導コイルの自己発熱、さらに高周波電源からの熱
がくぼみ空洞部に溜り、くぼみ空洞部は高温となる。そ
のため、バルブ内面に塗布された蛍光体が高温となるこ
とによる蛍光体の発光効率の低下や、誘導コイルの実効
抵抗値が上昇することによるランプ発光効率の低下、あ
るいは光束維持率の悪化を招くという問題がある。By the way, in an electrodeless discharge lamp in which an induction coil is disposed in a hollow cavity at the center of this type of bulb, heat generated from plasma and self-heating of the induction coil during lamp operation are reduced. Further, heat from the high-frequency power source accumulates in the hollow cavities, and the hollow cavities become hot. Therefore, the luminous efficiency of the phosphor decreases due to the high temperature of the phosphor applied to the inner surface of the bulb, the luminous efficiency of the lamp decreases due to the increase in the effective resistance value of the induction coil, or the luminous flux maintenance ratio deteriorates. There is a problem.
【０００８】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、発光効率の良
い無電極放電灯を提供することにある。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 high luminous efficiency.
【０００９】[0009]
【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、中心に有底筒状のくぼみ空洞部を有する電球
状のバルブと、前記くぼみ空洞部に配設される空芯の誘
導コイルとを備え、その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前記バルブ内に封入した放電ガ
スを励起発光させる無電極放電灯であって、前記バルブ
の直径に対する前記空洞部の直径の比を、発光効率がそ
の比における最大値の９０％以上となるように構成した
ことを特徴とするものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a bulb-shaped bulb having a bottomed cylindrical hollow cavity at the center thereof, and an air core guide disposed in the hollow hollow portion. And a coil, wherein the discharge gas enclosed in the bulb is excited and emitted by the action of a high-frequency electromagnetic field formed by the induction coil, wherein the ratio of the diameter of the hollow portion to the diameter of the bulb is provided. Is configured such that the luminous efficiency is 90% or more of the maximum value in the ratio.
【００１０】[0010]
（実施形態１）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、図中、１はガラス等の透光性
材料よりなるバルブであって、その外観は電球状で中心
に有底筒状のくぼみ空洞部８を有し、そのくぼみ空洞部
８の底面中央から排気管９が空洞８の中心軸に沿うよう
に形成されている。バルブ１の内壁面、つまり電球状内
壁面とくぼみ空洞部８の外側面には蛍光体層３が塗布に
より形成されている。また、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
されており、排気管９には、高温下で使用されてもラン
プ発光効率が下がらないように、水銀アマルガム１０が
封入されている。空芯の誘導コイル２は、くぼみ空洞部
８内のバルブ１の中心近傍に配設されている。(Embodiment 1) FIG. 1 shows an embodiment of an electrodeless discharge lamp according to the present invention. In the figure, reference numeral 1 denotes a bulb made of a light-transmitting material such as glass, which has a bulb-like appearance. In the center, there is a bottomed hollow cavity 8 having a bottom, and an exhaust pipe 9 is formed from the center of the bottom surface of the hollow cavity 8 along the central axis of the cavity 8. A phosphor layer 3 is formed on the inner wall surface of the bulb 1, that is, the inner wall surface of the bulb and the outer surface of the hollow cavity 8 by coating. A rare gas such as argon, for example, and mercury are sealed as a discharge gas inside the bulb 1. A mercury is inserted into the exhaust pipe 9 so that the lamp luminous efficiency does not decrease even when used at a high temperature. Amalgam 10 is enclosed. The air-core induction coil 2 is disposed near the center of the valve 1 in the hollow cavity 8.
【００１１】ここで、くぼみ空洞部８の形成は、開口を
有する電球状のガラスバルブ内に、先端部が閉塞された
円筒形のガラスステムをバルブ開口より挿入し、バルブ
開口縁とステムの開放端とを接合（封着）することによ
り行われる。Here, the hollow cavity 8 is formed by inserting a cylindrical glass stem with a closed end from the bulb opening into a bulb-shaped glass bulb having an opening, opening the bulb opening edge and opening the stem. This is performed by joining (sealing) the ends.
【００１２】１１はくぼみ空洞部８の内周面に沿って設
けられた電界シールドで、例えばアルミニウムのような
導電性材料で形成されている。電界シールド１１には縦
方向にスリットが設けられるとともに、口金６に接続し
て接地されている。電界シールド１１は誘導コイル２で
発生した電界がバルブ１内部に及ばないようにすると共
に、ランプからの発熱と誘導コイル２の発熱を口金６に
放熱する。バルブ封着部１２近傍にはバルブ保持体１３
が接着され、口金６とバルブ１を固定する。Reference numeral 11 denotes an electric field shield provided along the inner peripheral surface of the hollow portion 8, and is formed of a conductive material such as aluminum. The electric field shield 11 is provided with a slit in the vertical direction and is connected to the base 6 and grounded. The electric field shield 11 prevents the electric field generated in the induction coil 2 from reaching the inside of the bulb 1 and radiates heat from the lamp and heat of the induction coil 2 to the base 6. A valve holder 13 is provided near the valve sealing portion 12.
Are adhered, and the base 6 and the bulb 1 are fixed.
【００１３】誘導コイル２は、口金６の内部に配設され
た整合回路１４と同軸ケーブル１５を介して、１３．５
６ＭＨｚの高周波電源７に接続されている。整合回路１
４は、ランプ点灯中、誘導コイル２と同軸ケーブル１５
とのインピーダンスの整合がとれるように構成されてい
る。バルブ１と誘導コイル２を高周波電源７と別体とす
ることで、高周波電源７で発生した熱が、バルブ１と誘
導コイル２に伝導することがなく、ランプ発光効率は向
上する。The induction coil 2 is connected to a matching circuit 14 disposed inside the base 6 and a coaxial cable 15 to form a coil 13.5.
It is connected to a 6 MHz high frequency power supply 7. Matching circuit 1
4 is the induction coil 2 and the coaxial cable 15 while the lamp is on.
It is configured so that impedance matching with the above can be achieved. By making the bulb 1 and the induction coil 2 separate from the high-frequency power supply 7, heat generated by the high-frequency power supply 7 does not conduct to the bulb 1 and the induction coil 2, and the lamp luminous efficiency is improved.
【００１４】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に高周波電源７で発生させた高周波電
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内に封入した放電ガスに作用し、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層３によって可視光に変換され
る。In the electrodeless discharge lamp thus configured, when a high-frequency current generated by a high-frequency power supply 7 is applied to the induction coil 2, a high-frequency electromagnetic field formed around the induction coil 2 is sealed in the bulb 1. Acting on the discharged discharge gas, plasma is formed, and the mercury is excited to emit ultraviolet rays. This ultraviolet light is converted into visible light by the phosphor layer 3.
【００１５】このような無電極放電灯における、バルブ
１の直径に対する空洞部９の直径の比と相対的ランプ発
光効率の関係を図２に示す。図２より明らかなように、
バルブ１の直径に対する空洞部９の直径の比が０．３付
近で発光効率は最大となることがわかる。FIG. 2 shows the relationship between the ratio of the diameter of the hollow portion 9 to the diameter of the bulb 1 and the relative lamp luminous efficiency in such an electrodeless discharge lamp. As is clear from FIG.
It can be seen that the luminous efficiency is maximized when the ratio of the diameter of the cavity 9 to the diameter of the bulb 1 is around 0.3.
【００１６】この理由について、まず、バルブ１の直径
に対する空洞部９の直径の比が小さい場合を考える。こ
の場合、誘導コイル２の径が小さくなるため、誘導コイ
ル２の品質係数Ｑが小さくなり、誘導コイル２での抵抗
損が増加する。また、空洞部９の温度も上昇し、蛍光体
層３の発光効率の低下も招く。さらに、蛍光体層３の面
積も小さくなるため、発光効率は低下する。For this reason, first, consider the case where the ratio of the diameter of the cavity 9 to the diameter of the bulb 1 is small. In this case, since the diameter of the induction coil 2 becomes small, the quality factor Q of the induction coil 2 becomes small, and the resistance loss in the induction coil 2 increases. In addition, the temperature of the cavity 9 also increases, and the luminous efficiency of the phosphor layer 3 decreases. Further, since the area of the phosphor layer 3 is reduced, the luminous efficiency is reduced.
【００１７】逆に、バルブ１の直径に対する空洞部９の
直径の比が大きい場合は、プラズマの体積が小さくな
り、発光効率は低下する。Conversely, when the ratio of the diameter of the hollow portion 9 to the diameter of the bulb 1 is large, the volume of the plasma becomes small, and the luminous efficiency decreases.
【００１８】このように、バルブ１の直径に対する空洞
部９の直径の比が０．３程度になるように設計するのが
望ましいが、ランプ製造時のコストと空洞部９を構成す
るステムの入手の容易性を考慮すると、ステムは既存の
ガラス管から加工する必要がある。従って、発光効率を
あまり落とさず、すなわち最大発光効率の９０％以上の
範囲で、コストと入手の容易性から、バルブ１の直径に
対する空洞部９の直径の比が決定される。As described above, it is desirable that the ratio of the diameter of the hollow portion 9 to the diameter of the bulb 1 is designed to be about 0.3. However, the cost in manufacturing the lamp and the availability of the stem constituting the hollow portion 9 are desirable. Considering the ease of the process, the stem needs to be machined from an existing glass tube. Therefore, the ratio of the diameter of the hollow portion 9 to the diameter of the bulb 1 is determined without significantly reducing the luminous efficiency, that is, within the range of 90% or more of the maximum luminous efficiency, from the viewpoint of cost and availability.
【００１９】また、バルブ１の直径に対する空洞部９の
直径の比が０．２５より小さくなると、発光効率が低下
することに加えて、空洞部９の温度がかなり高くなり、
高価な誘導コイル２を用いる必要が生じる。When the ratio of the diameter of the hollow portion 9 to the diameter of the bulb 1 is smaller than 0.25, the temperature of the hollow portion 9 becomes considerably high in addition to the decrease in luminous efficiency.
It becomes necessary to use an expensive induction coil 2.
【００２０】さらに、バルブ１の直径に対する空洞部９
の直径の比が０．５以上になると、上記封着部１２の径
が大きくなり、ガラス加工での信頼性が低下する。Furthermore, the cavity 9 relative to the diameter of the bulb 1
When the ratio of the diameters is 0.5 or more, the diameter of the sealing portion 12 increases, and the reliability in glass processing decreases.
【００２１】これまでにも、フェライットコアなどの鉄
心を用いた誘導コイルによる無電極放電ランプも研究開
発されているが、この種の無電極放電ランプは、誘導コ
イルを収容するくぼみ空洞部の径を小さくしても誘導コ
イルの品質係数Ｑを大きくできるため、図２に示す特性
とは異なった特性を示す。従って、空洞部の径を小さく
することでガラス加工の信頼性が向上する反面、鉄心で
の発熱対策が必要になる。Until now, an electrodeless discharge lamp using an induction coil using an iron core such as a ferrite core has been researched and developed. However, this type of electrodeless discharge lamp has a hollow cavity for accommodating the induction coil. Since the quality factor Q of the induction coil can be increased even if the diameter is reduced, the characteristic is different from the characteristic shown in FIG. Therefore, while reducing the diameter of the hollow portion improves the reliability of glass processing, it is necessary to take measures against heat generation in the iron core.
【００２２】（実施形態２）図３は本発明に係る第２の
実施形態を示すもので、上記実施形態１と異なる点は、
くぼみ空洞部８の外側面に保護膜１６を形成し、その上
に蛍光体層３を形成したことで、他の構成は実施形態１
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。(Embodiment 2) FIG. 3 shows a second embodiment according to the present invention.
The protection film 16 is formed on the outer surface of the cavity 8 and the phosphor layer 3 is formed thereon.
Therefore, the same components are denoted by the same reference numerals and description thereof will be omitted.
【００２３】一般に、保護膜材料としては、アルミナ
（Ａｌ2 Ｏ3 ）、シリカ（ＳｉＯ2 ）、チタニア（Ｔｉ
Ｏ2 ）、セリア（ＣｅＯ2 ）、イットリア（Ｙ
2 Ｏ3 ）、マグネシア（ＭｇＯ）等の微粒子が用いら
れ、水銀とガラスとの反応を抑えることにより、光束維
持率を向上させている。保護膜は、通常の蛍光灯では透
過率が高い方が望ましいため、蛍光体層に比べ薄くガラ
ス内面に形成される。Generally, alumina (Al 2 O 3 ), silica (SiO 2 ), titania (Ti
O 2 ), ceria (CeO 2 ), yttria (Y
Fine particles such as 2 O 3 ) and magnesia (MgO) are used to suppress the reaction between mercury and glass, thereby improving the luminous flux maintenance factor. The protective film is preferably formed on the inner surface of the glass thinner than the phosphor layer because it is desirable that the transmittance is higher in a normal fluorescent lamp.
【００２４】しかし、本実施形態においては、保護膜１
６における光の反射率が高い方が、空洞部８へ向かう光
を反射させてバルブ１外部に利用できるため、発光効率
は向上する。表１に保護膜１６の厚さと相対発光効率の
関係を示す。これより明らかなように、保護膜１６を厚
く塗布することにより、保護膜１６での光の反射率が上
がり、発光効率は約３％向上していることがわかる。ま
た、保護膜１６を厚くすることにより、誘導コイル２近
傍の強いプラズマと空洞部８を構成するステムのガラス
との反応を抑えることができ、光束維持率が向上する。However, in this embodiment, the protective film 1
The higher the reflectance of light at 6 is, the more the light directed toward the cavity 8 is reflected and can be used outside the bulb 1, so that the luminous efficiency is improved. Table 1 shows the relationship between the thickness of the protective film 16 and the relative luminous efficiency. As is clear from this, by applying the protective film 16 thickly, the light reflectance on the protective film 16 is increased, and the luminous efficiency is improved by about 3%. Further, by increasing the thickness of the protective film 16, it is possible to suppress the reaction between the strong plasma near the induction coil 2 and the glass of the stem constituting the cavity 8, thereby improving the luminous flux maintenance rate.
【００２５】[0025]
【表１】 （実施形態３）図４は本発明に係る第３の実施形態を示
すもので、上記実施形態１と異なる点は、くぼみ空洞部
８の形状を底面径が小さい円錐台形としたことで、他の
構成は実施形態１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。[Table 1] (Embodiment 3) FIG. 4 shows a third embodiment according to the present invention. The difference from Embodiment 1 is that the shape of the hollow cavity 8 is a truncated cone having a small bottom diameter. Is similar to that of the first embodiment, and the description thereof will be omitted by assigning the same reference numerals to the same components.
【００２６】バルブ１内に生じるプラズマの存在する放
電空間が空洞部８の底面側では狭いことから、ランプ側
面方向に出力される光束は大きいがランプ頂部方向に出
力される光束が小さくなる。そこで、本実施形態のよう
に空洞部８を底面径が小さい円錐台形状とすることによ
り、空洞部８の外側面に塗布された蛍光体層３からの発
光を効率的にランプ頂部方向へ放射させることができ
る。また、このように構成することにより、空洞部８に
配設する誘導コイル２の装着が容易となる。Since the discharge space where the plasma generated in the bulb 1 exists is narrow on the bottom side of the cavity 8, the luminous flux outputted toward the lamp side is large, but the luminous flux outputted toward the lamp top becomes small. Therefore, by forming the hollow portion 8 into a truncated cone shape having a small bottom diameter as in the present embodiment, light emission from the phosphor layer 3 applied to the outer surface of the hollow portion 8 is efficiently radiated toward the lamp top. Can be done. In addition, with such a configuration, the mounting of the induction coil 2 provided in the cavity 8 becomes easy.
【００２７】（実施形態４）図５は本発明に係る第４の
実施形態を示すもので、上記実施形態１と異なる点は、
くぼみ空洞部８を石英ガラス、ホウ珪酸ガラスまたは低
アルカリセラミックスといったアルカリ含有率が５．０
％（重量）以下の材質としたことで、他の構成は実施形
態１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。(Embodiment 4) FIG. 5 shows a fourth embodiment according to the present invention.
The hollow cavity 8 has an alkali content of 5.0 such as quartz glass, borosilicate glass or low alkali ceramics.
% (Weight) or less, and the other configuration is the same as that of the first embodiment.
【００２８】このように構成することにより、ガラスか
ら供給されるナトリウムと水銀との反応を抑制でき、黒
化防止による寿命改善が図れる。With this configuration, the reaction between sodium and mercury supplied from the glass can be suppressed, and the life can be improved by preventing blackening.
【００２９】（実施形態５）図６は本発明に係る第５の
実施形態を示すもので、上記実施形態１と異なる点は、
石英ガラス、ホウ珪酸ガラスまたは低アルカリセラミッ
クスといったアルカリ含有率が５．０％（重量）以下の
材質や、保護膜と同じ材料であるアルミナセラミックス
などからなる有底筒状体１７をくぼみ空洞部８に被せ、
その筒状体１７の外側面に蛍光体層３を形成したこと
で、他の構成は実施形態１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。(Embodiment 5) FIG. 6 shows a fifth embodiment according to the present invention.
A hollow cylindrical part 17 made of a bottomed cylindrical body 17 made of a material having an alkali content of 5.0% (weight) or less such as quartz glass, borosilicate glass, or low alkali ceramics or alumina ceramics, which is the same material as the protective film, is hollowed out. Over
Since the phosphor layer 3 is formed on the outer surface of the cylindrical body 17 and the other configuration is the same as that of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
【００３０】このように筒状体１７を設けることによ
り、筒状体１７がガラスから供給されるナトリウムと水
銀との反応を阻止し、黒化防止による寿命改善が図れる
上に、可視光を反射するので反射膜としての効果も兼ね
備える。By providing the cylindrical body 17 in this way, the cylindrical body 17 prevents the reaction between sodium and mercury supplied from the glass, thereby improving the life by preventing blackening and reflecting visible light. Therefore, it also has an effect as a reflection film.
【００３１】（実施形態６）図７は本発明に係る第６の
実施形態を示すもので、上記実施形態１と異なる点は、
熱伝導の良い鉄やニッケルで形成された金属線１８を、
排気管９に封入された水銀アマルガム１０からバルブ１
内の放電空間中に導入する構成としたことであり、ま
た、水銀アマルガム１０の温度が最適温度に達すると断
線するような手段１９、例えばバイメタルで形成された
素子１９を金属線１８に介在させたことで、他の構成は
実施形態１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。(Embodiment 6) FIG. 7 shows a sixth embodiment according to the present invention.
Metal wire 18 made of iron or nickel with good heat conductivity
From the mercury amalgam 10 sealed in the exhaust pipe 9 to the valve 1
The mercury amalgam 10 is connected to the metal wire 18 by means of a means 19 for breaking the wire when the temperature of the mercury amalgam 10 reaches the optimum temperature, for example, an element 19 made of a bimetal. Thus, other configurations are the same as those of the first embodiment, and the same components are denoted by the same reference numerals and description thereof will be omitted.
【００３２】このように構成することにより、金属線１
８を介して熱が水銀アマルガム１０に伝わり、水銀アマ
ルガム１０の温度を素早く上げることができ、ランプ始
動時の光束立ち上がりを改善できる。With this configuration, the metal wire 1
The heat is transmitted to the mercury amalgam 10 via 8, and the temperature of the mercury amalgam 10 can be quickly raised, so that the rising of the luminous flux when the lamp is started can be improved.
【００３３】（実施形態７）図８は本発明に係る第７の
実施形態を示すもので、上記実施形態１と異なる点は、
くぼみ空洞部８の底面と排気管９に封入された水銀アマ
ルガム１０とを、外側から熱伝導の良い鉄やニッケルで
形成された金属線１８で接続したことであり、また、水
銀アマルガム１０の温度が最適温度に達すると断線する
ような手段１９、例えばバイメタルで形成された素子１
９を金属線１８に介在させたことで、他の構成は実施形
態１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。(Embodiment 7) FIG. 8 shows a seventh embodiment according to the present invention.
The bottom surface of the cavity 8 and the mercury amalgam 10 sealed in the exhaust pipe 9 are connected from outside by a metal wire 18 made of iron or nickel having good heat conductivity. Means 19 that breaks when the temperature reaches the optimum temperature, for example, the element 1 formed of a bimetal.
Since the other configuration is the same as that of the first embodiment by interposing the metal wire 9 in the metal wire 18, the description is omitted by attaching the same reference numerals to the same configuration.
【００３４】このように構成することにより、上記実施
形態６と同様に、水銀アマルガム１０の温度を素早く上
げることができ、ランプ始動時の光束立ち上がりを改善
できる。With this configuration, the temperature of the mercury amalgam 10 can be quickly raised, and the rise of the luminous flux when the lamp is started can be improved, as in the sixth embodiment.
【００３５】（実施形態８）図９および図１０は本発明
に係る第８の実施形態を示すもので、上記実施形態１と
異なる点は、上記バルブ保持体１３を空洞軸方向に長く
形成して、その側面が外気と接するようにするととも
に、その側面に開口部３３を設け、バルブ保持体１３に
通気性を持たせたことで、他の構成は実施形態１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。(Eighth Embodiment) FIGS. 9 and 10 show an eighth embodiment according to the present invention. The difference from the first embodiment is that the valve holder 13 is formed longer in the cavity axis direction. Since the side surface is brought into contact with the outside air, an opening 33 is provided on the side surface, and the valve holder 13 is provided with air permeability, and the other configuration is the same as that of the first embodiment. The description is omitted by giving the same reference numerals to the configurations.
【００３６】このように構成することにより、電界シー
ルド１１の一部がバルブ保持体１３の開口部３３より流
入した外気により冷却され、熱伝導により誘導コイル２
と共にくぼみ空洞部８内の空気も冷却され、ランプ発光
効率や光束維持率の向上が図れる。With this configuration, a part of the electric field shield 11 is cooled by the outside air flowing from the opening 33 of the valve holder 13, and the induction coil 2 is thermally conducted.
At the same time, the air in the cavity 8 is also cooled, so that the lamp luminous efficiency and the luminous flux maintenance rate can be improved.
【００３７】（実施形態９）図１１は本発明に係る第９
の実施形態を示すもので、上記実施形態３と異なる点
は、上記バルブ保持体１３を空洞軸方向に長く形成し
て、その側面が外気と接するようにするとともに、その
側面に開口部３３を設け、バルブ保持体１３に通気性を
持たせたことで、他の構成は実施形態３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。(Embodiment 9) FIG. 11 shows a ninth embodiment according to the present invention.
The third embodiment is different from the third embodiment in that the valve holder 13 is formed to be long in the cavity axis direction so that the side surface is in contact with the outside air, and the opening 33 is formed in the side surface. Since the other configuration is the same as that of the third embodiment by providing the valve holder 13 with air permeability, the description is omitted by attaching the same reference numerals to the same components.
【００３８】このように構成することにより、バルブ保
持体１３の開口部３３より流入した外気に接する電界シ
ールド１１の部分を広くすることができるので、実施形
態８に比べて、誘導コイル２とくぼみ空洞部８内の空気
はさらに冷却される。With this configuration, the portion of the electric field shield 11 that comes into contact with the outside air flowing in from the opening 33 of the valve holder 13 can be widened. The air in the cavity 8 is further cooled.
【００３９】（実施形態１０）図１２は本発明に係る第
１０の実施形態を示すもので、実施形態８の構成に加
え、電界シールド１１のバルブ保持体１３に囲まれた空
気に接する部分にも開口部３４を設け、電界シールド１
１内の空気と外気の入れ換えが生ずるようにしたもので
ある。この構成により、電界シールド１１内の空気は冷
やされ、熱伝導により誘導コイル２も冷却される。(Embodiment 10) FIG. 12 shows a tenth embodiment according to the present invention. In addition to the structure of Embodiment 8, a portion of the electric field shield 11 in contact with air surrounded by the valve holder 13 is shown. The opening 34 is also provided, and the electric field shield 1 is provided.
1 is designed so that the inside air and the outside air are exchanged. With this configuration, the air in the electric field shield 11 is cooled, and the induction coil 2 is also cooled by heat conduction.
【００４０】（実施形態１１）図１３は本発明に係る第
１１の実施形態を示すもので、実施形態１０の構成に加
え、バルブ保持体１３と整合回路１４が配設された口金
６との間に、熱伝導性の良くない材料（ゴム、ベークラ
イト等）よりなる断熱材３５を配設したものである。な
お、この断熱材３５は、電界シールド１１内部の空間と
口金６内の空間との間も塞ぐように配置してある。(Embodiment 11) FIG. 13 shows an eleventh embodiment according to the present invention. In addition to the structure of the tenth embodiment, a valve holder 13 and a base 6 provided with a matching circuit 14 are provided. A heat insulating material 35 made of a material having poor thermal conductivity (rubber, bakelite, or the like) is provided between them. The heat insulating material 35 is arranged so as to close the space between the space inside the electric field shield 11 and the space inside the base 6.
【００４１】このように構成することにより、電界シー
ルド１１内の空気が口金６内に流入することを妨げ、ま
た、電界シールド１１、バルブ保持体１３を経由する熱
が口金６内部に流入することも妨げるため、口金６内部
および誘導コイル２を支持する部分３６の温度を下げる
ことができる。With this configuration, the air in the electric field shield 11 is prevented from flowing into the base 6, and the heat passing through the electric field shield 11 and the valve holder 13 flows into the base 6. Therefore, the temperature of the base 6 and the portion 36 supporting the induction coil 2 can be reduced.
【００４２】[0042]
【発明の効果】本発明は上記のように、バルブの直径に
対する空洞部の直径の比を最適化することにより、蛍光
体と誘導コイルの温度上昇を抑え、ランプ発光効率や光
束維持率の優れた無電極放電灯を提供することができ
る。As described above, according to the present invention, by optimizing the ratio of the diameter of the hollow portion to the diameter of the bulb, the temperature rise of the phosphor and the induction coil is suppressed, and the lamp luminous efficiency and the luminous flux maintenance ratio are improved. And an electrodeless discharge lamp.
【００４３】さらに、くぼみ空洞部の外側面に、光を反
射する程度の厚みを有する保護膜を形成したことによ
り、ガラスとプラズマとの反応を抑えると共に、効率的
にランプ外部に光を取り出すことができ、ランプ発光効
率や光束維持率の優れた無電極放電灯を提供することが
できる。Further, by forming a protective film having a thickness to reflect light on the outer surface of the hollow cavity, it is possible to suppress the reaction between the glass and the plasma and efficiently extract the light to the outside of the lamp. Thus, it is possible to provide an electrodeless discharge lamp having excellent lamp luminous efficiency and luminous flux maintenance ratio.
【００４４】また、くぼみ空洞部の形状を底面径が小さ
い円錐台形としたことにより、効率的にランプ外部に光
を取り出すことができ、ランプ発光効率に優れた無電極
放電灯を提供することができる。In addition, since the shape of the hollow cavity is a truncated cone with a small bottom diameter, light can be efficiently extracted to the outside of the lamp, and an electrodeless discharge lamp having excellent lamp luminous efficiency can be provided. it can.
【００４５】また、くぼみ空洞部をアルカリ含有率が
５．０％（重量）以下のガラスまたはセラミックスで形
成するか、くぼみ空洞部の外側面をアルカリ含有率が
５．０％（重量）以下のガラスまたはセラミックスで被
覆することにより、ガラスとプラズマとの反応を抑え、
光束維持率の優れた無電極放電灯を提供できる。Further, the hollow cavity is formed of glass or ceramic having an alkali content of 5.0% (weight) or less, or the outer surface of the hollow cavity is formed of an alkali content of 5.0% (weight) or less. By coating with glass or ceramics, the reaction between glass and plasma is suppressed,
An electrodeless discharge lamp having an excellent luminous flux maintenance ratio can be provided.
【００４６】さらに、くぼみ空洞部の中心軸に沿うよう
に形成された排気管内に封入された水銀アマルガムを、
水銀と反応しない熱伝導の良い金属線を介してバルブ内
空間またはバルブ面の高温部と接続したことにより、光
束立ち上がりに優れた無電極放電灯を提供することがで
きる。Further, mercury amalgam sealed in an exhaust pipe formed along the central axis of the hollow cavity is
An electrodeless discharge lamp excellent in luminous flux rising can be provided by being connected to the interior space of the bulb or a high temperature portion of the bulb surface through a metal wire having good heat conductivity that does not react with mercury.
【００４７】また、電界シールドの外側面の少なくとも
一部が外気と接するように構成したことにより、誘導コ
イルと共にくぼみ空洞部内の空気も冷却され、ランプ発
光効率や光束維持率の優れた無電極放電灯を提供するこ
とができる。Further, since at least a part of the outer surface of the electric field shield is in contact with the outside air, the air in the hollow cavity is cooled together with the induction coil, and the electrodeless discharge lamp having excellent lamp luminous efficiency and luminous flux maintenance ratio is provided. An electric light can be provided.
【図１】本発明に係る第１の実施形態を示す簡略断面図
である。FIG. 1 is a simplified cross-sectional view showing a first embodiment according to the present invention.
【図２】バルブの直径に対する空洞部の直径の比と相対
発光効率の関係を示すグラフである。FIG. 2 is a graph showing a relationship between a ratio of a diameter of a hollow portion to a diameter of a bulb and a relative luminous efficiency.
【図３】本発明に係る第２の実施形態を示す簡略断面図
である。FIG. 3 is a simplified sectional view showing a second embodiment according to the present invention.
【図４】本発明に係る第３の実施形態を示す簡略断面図
である。FIG. 4 is a simplified sectional view showing a third embodiment according to the present invention.
【図５】本発明に係る第４の実施形態を示す簡略断面図
である。FIG. 5 is a simplified sectional view showing a fourth embodiment according to the present invention.
【図６】本発明に係る第５の実施形態を示す簡略断面図
である。FIG. 6 is a simplified sectional view showing a fifth embodiment according to the present invention.
【図７】本発明に係る第６の実施形態を示す簡略断面図
である。FIG. 7 is a simplified sectional view showing a sixth embodiment according to the present invention.
【図８】本発明に係る第７の実施形態を示す簡略断面図
である。FIG. 8 is a simplified sectional view showing a seventh embodiment according to the present invention.
【図９】本発明に係る第８の実施形態を示す簡略断面図
である。FIG. 9 is a simplified sectional view showing an eighth embodiment according to the present invention.
【図１０】本発明に係る第８の実施形態を示す簡略側面
図である。FIG. 10 is a simplified side view showing an eighth embodiment according to the present invention.
【図１１】本発明に係る第９の実施形態を示す簡略断面
図である。FIG. 11 is a simplified sectional view showing a ninth embodiment according to the present invention.
【図１２】本発明に係る第１０の実施形態を示す簡略断
面図である。FIG. 12 is a simplified sectional view showing a tenth embodiment according to the present invention.
【図１３】本発明に係る第１１の実施形態を示す簡略断
面図である。FIG. 13 is a simplified sectional view showing an eleventh embodiment according to the present invention.
【図１４】従来例を示す斜視図である。FIG. 14 is a perspective view showing a conventional example.
【図１５】異なる従来例を示す一部断面の正面図であ
る。FIG. 15 is a front view of a partial cross section showing a different conventional example.
１ バルブ ２ 誘導コイル ３ 蛍光体層源 ６ 口金 ７ 高周波電源 ８ くぼみ空洞部 ９ 排気管 １０ 水銀アマルガム １１ 電界シールド １２ バルブ封着部 １３ バルブ保持体 １４ 整合回路 １５ 同軸ケーブル １６ 保護膜 １７ 筒状体 １８ 金属線 １９ 断線手段 DESCRIPTION OF SYMBOLS 1 Bulb 2 Induction coil 3 Phosphor layer source 6 Cap 7 High frequency power supply 8 Recess cavity 9 Exhaust pipe 10 Mercury amalgam 11 Electric field shield 12 Valve sealing part 13 Valve holder 14 Matching circuit 15 Coaxial cable 16 Protective film 17 Cylindrical body 18 Metal wire 19 Disconnection means
───────────────────────────────────────────────────── フロントページの続き (72)発明者 河野 謙司 大阪府門真市大字門真1048番地松下電工株 式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Kono 1048 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Works, Ltd.
Claims (11)
電球状のバルブと、前記くぼみ空洞部に配設される空芯
の誘導コイルとを備え、その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前記バルブ内に封入した放
電ガスを励起発光させる無電極放電灯であって、前記バ
ルブの直径に対する前記空洞部の直径の比を、発光効率
がその比における最大値の９０％以上となるように構成
したことを特徴とする無電極放電灯。1. A high-frequency electromagnetic device formed by a bulb-shaped bulb having a bottomed hollow cavity at the center thereof and an air-core induction coil disposed in the hollow cavity. An electrodeless discharge lamp that excites and emits a discharge gas sealed in the bulb by the action of an electric field, wherein the ratio of the diameter of the hollow portion to the diameter of the bulb is determined by determining the luminous efficiency to be 90% or more of the maximum value in the ratio. An electrodeless discharge lamp characterized in that:
の比が、０．２５乃至０．５である請求項１記載の無電
極放電灯。2. The electrodeless discharge lamp according to claim 1, wherein a ratio of a diameter of the hollow portion to a diameter of the bulb is 0.25 to 0.5.
界シールドを設けたことを特徴とする請求項１または請
求項２記載の無電極放電灯。3. The electrodeless discharge lamp according to claim 1, wherein an electric field shield is provided along an inner peripheral surface of the hollow cavity.
する程度の厚みを有する保護膜を形成するとともに、保
護膜の上に蛍光体層を形成したことを特徴とする請求項
１、請求項２または請求項３記載の無電極放電灯。4. The method according to claim 1, wherein a protective film having a thickness to reflect light is formed on an outer surface of the hollow cavity, and a phosphor layer is formed on the protective film. The electrodeless discharge lamp according to claim 2.
る請求項４記載の無電極放電灯。5. The electrodeless discharge lamp according to claim 4, wherein said protective film has a thickness of 1 mg / cm 2 or more.
い円錐台形としたことを特徴とする請求項１乃至請求項
５のいずれかに記載の無電極放電灯。6. The electrodeless discharge lamp according to claim 1, wherein said hollow cavity has a truncated conical shape having a small bottom surface diameter.
５．０％（重量）以下のガラスまたはセラミックスで形
成したことを特徴とする請求項１乃至請求項６のいずれ
かに記載の無電極放電灯。7. The electrodeless discharge device according to claim 1, wherein the hollow cavity is formed of glass or ceramic having an alkali content of 5.0% (by weight) or less. Electric lights.
有率が５．０％（重量）以下のガラスまたはセラミック
スで被覆するとともに、その上に蛍光体層を形成したこ
とを特徴とする請求項１乃至請求項６のいずれかに記載
の無電極放電灯。8. The method according to claim 1, wherein an outer surface of the cavity is covered with glass or ceramic having an alkali content of 5.0% (by weight) or less, and a phosphor layer is formed thereon. The electrodeless discharge lamp according to any one of claims 1 to 6.
形成された排気管内に封入された水銀アマルガムを、水
銀と反応しない熱伝導の良い金属線を介してバルブ内空
間またはバルブ面の高温部と接続したことを特徴とする
請求項１乃至請求項８のいずれかに記載の無電極放電
灯。9. Mercury amalgam sealed in an exhaust pipe formed along the central axis of the hollow cavity is heated at a high temperature in a valve space or a valve surface through a metal wire having good heat conduction which does not react with mercury. The electrodeless discharge lamp according to any one of claims 1 to 8, wherein the discharge lamp is connected to a unit.
に達すると断線する手段を前記金属線に介在したことを
特徴とする請求項９記載の無電極放電灯。10. The electrodeless discharge lamp according to claim 9, wherein means for disconnecting when the temperature of the mercury amalgam reaches an optimum temperature is interposed in the metal wire.
も一部が外気と接するように構成したことを特徴とする
請求項３乃至請求項１０のいずれかに記載の無電極放電
灯。11. The electrodeless discharge lamp according to claim 3, wherein at least a part of an outer surface of said electric field shield is in contact with outside air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13117097A JP3577889B2 (en) | 1997-05-21 | 1997-05-21 | Electrodeless discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13117097A JP3577889B2 (en) | 1997-05-21 | 1997-05-21 | Electrodeless discharge lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10321194A true JPH10321194A (en) | 1998-12-04 |
| JP3577889B2 JP3577889B2 (en) | 2004-10-20 |
Family
ID=15051654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13117097A Expired - Fee Related JP3577889B2 (en) | 1997-05-21 | 1997-05-21 | Electrodeless discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3577889B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030037653A (en) * | 2001-11-07 | 2003-05-14 | 엘지전자 주식회사 | Compacted electrodeless lighting system |
| WO2004006289A1 (en) * | 2002-07-02 | 2004-01-15 | Matsushita Electric Industrial Co., Ltd. | Bulb type electrodeless discharge lamp and electrodeless discharge lamp lighting device |
| JP2004327391A (en) * | 2003-04-28 | 2004-11-18 | Matsushita Electric Works Ltd | Electrodeless discharge lamp |
| US6977462B2 (en) | 2002-07-30 | 2005-12-20 | Matsushita Electric Industrial Co., Ltd. | Fluorescent lamp having phosphor layer |
| JP2007073479A (en) * | 2005-09-09 | 2007-03-22 | Phoenix Denki Kk | Discharge lamp unit |
| JP2008153022A (en) * | 2006-12-15 | 2008-07-03 | Matsushita Electric Works Ltd | Electrodeless fluorescent lamp and lighting equipment |
| JP2010192400A (en) * | 2009-02-20 | 2010-09-02 | Panasonic Electric Works Co Ltd | Electrodeless discharge lamp and luminaire |
-
1997
- 1997-05-21 JP JP13117097A patent/JP3577889B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030037653A (en) * | 2001-11-07 | 2003-05-14 | 엘지전자 주식회사 | Compacted electrodeless lighting system |
| WO2004006289A1 (en) * | 2002-07-02 | 2004-01-15 | Matsushita Electric Industrial Co., Ltd. | Bulb type electrodeless discharge lamp and electrodeless discharge lamp lighting device |
| US7064490B2 (en) | 2002-07-02 | 2006-06-20 | Matsushita Electric Industrial Co., Ltd. | Compact self-ballasted electrodeless discharge lamp and electrodeless-discharge-lamp lighting device |
| US6977462B2 (en) | 2002-07-30 | 2005-12-20 | Matsushita Electric Industrial Co., Ltd. | Fluorescent lamp having phosphor layer |
| JP2004327391A (en) * | 2003-04-28 | 2004-11-18 | Matsushita Electric Works Ltd | Electrodeless discharge lamp |
| JP2007073479A (en) * | 2005-09-09 | 2007-03-22 | Phoenix Denki Kk | Discharge lamp unit |
| JP2008153022A (en) * | 2006-12-15 | 2008-07-03 | Matsushita Electric Works Ltd | Electrodeless fluorescent lamp and lighting equipment |
| JP2010192400A (en) * | 2009-02-20 | 2010-09-02 | Panasonic Electric Works Co Ltd | Electrodeless discharge lamp and luminaire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3577889B2 (en) | 2004-10-20 |
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