JP3387242B2 - Electrodeless lamp - Google Patents
Electrodeless lampInfo
- Publication number
- JP3387242B2 JP3387242B2 JP28945894A JP28945894A JP3387242B2 JP 3387242 B2 JP3387242 B2 JP 3387242B2 JP 28945894 A JP28945894 A JP 28945894A JP 28945894 A JP28945894 A JP 28945894A JP 3387242 B2 JP3387242 B2 JP 3387242B2
- Authority
- JP
- Japan
- Prior art keywords
- coil
- induction coil
- holding means
- bulb
- discharge gas
- 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.)
- Expired - Fee Related
Links
- 230000006698 induction Effects 0.000 claims description 55
- 239000000919 ceramic Substances 0.000 claims description 24
- 229910052709 silver Inorganic materials 0.000 claims description 18
- 239000004332 silver Substances 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 12
- 230000005672 electromagnetic field Effects 0.000 claims description 11
- 239000011810 insulating material Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 230000005284 excitation Effects 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 15
- 238000004804 winding Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 235000009518 sodium iodide Nutrition 0.000 description 1
- CMJCEVKJYRZMIA-UHFFFAOYSA-M thallium(i) iodide Chemical compound [Tl]I CMJCEVKJYRZMIA-UHFFFAOYSA-M 0.000 description 1
- RMUKCGUDVKEQPL-UHFFFAOYSA-K triiodoindigane Chemical compound I[In](I)I RMUKCGUDVKEQPL-UHFFFAOYSA-K 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Description
【０００１】[0001]
【産業上の利用分野】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 does not have an electrode inside a bulb made of a translucent material in which a discharge gas is sealed, and a high-frequency electromagnetic field is applied to the discharge gas from outside the bulb to discharge the discharge gas. The present invention relates to an electrodeless discharge lamp adapted to emit light by excitation.
【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ランプが知ら
れている。この種の無電極放電ランプは、小型、高出
力、長寿命などの特徴を有しているものであるから、各
所で研究開発がなされ、高出力点光源などとして様々の
利用が考えられている。2. Description of the Related Art Conventionally, there is known an electrodeless discharge lamp in which a discharge gas enclosed in a bulb is excited by a high frequency electromagnetic field so as to excite the discharge gas to emit light. 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 is considered to be variously used as a high output point light source. .
【０００３】無電極放電ランプとしては、図６に示すよ
うに、電球形のバルブ１と誘導コイル２とを備え、バル
ブ１は誘導コイル２を囲むように形成されており、誘導
コイル２に対して高周波電流を通電し、バルブ１の中に
封入された放電ガスに高周波電磁界を作用させることに
よって、放電ガスを励起発光させるようにしたものがあ
る（特開昭５７−７８７６６号公報参照）。放電ガスと
しては、水銀蒸気を含むものが用いられ、水銀原子の励
起によって紫外線が放射され、蛍光体で可視光に変換さ
れるようになっている。As shown in FIG. 6, the electrodeless discharge lamp comprises a bulb-shaped bulb 1 and an induction coil 2, and the bulb 1 is formed so as to surround the induction coil 2. There is a method in which a high-frequency current is applied to the discharge gas and a high-frequency electromagnetic field is applied to the discharge gas sealed in the bulb 1 to excite the discharge gas to emit light (see Japanese Patent Laid-Open No. 57-78766). . As the discharge gas, a gas containing mercury vapor is used, and ultraviolet rays are emitted by excitation of mercury atoms and converted into visible light by a phosphor.
【０００４】[0004]
【発明が解決しようとする課題】ところで、誘導コイル
として用いられているコイル２は、バルブ１によって囲
まれているため、ランプ動作時に非常に高温になり、特
に高出力タイプの場合には、コイル２が劣化したりコイ
ル２での消費電力が増加し、効率が悪くなるという問題
がある。Since the coil 2 used as the induction coil is surrounded by the bulb 1, the coil 2 becomes extremely hot during lamp operation. Particularly, in the case of a high output type coil, 2 deteriorates or the power consumption of the coil 2 increases, resulting in poor efficiency.
【０００５】これに対して図７に示すように、球状のバ
ルブ１と、バルブ１の外周に巻線を巻回した誘導コイル
２とを備え、高周波電源３から誘導コイル２に高周波電
流を通電する無電極放電灯が考えられている。かかる無
電極放電灯では、コイル２の熱を外気に逃がすことがで
きる上、コイル１内側の電磁界の強い部分を有効に放電
ガスに作用させることができる。On the other hand, as shown in FIG. 7, a spherical valve 1 and an induction coil 2 having a winding wound around the outer periphery of the valve 1 are provided, and a high frequency current is passed from the high frequency power source 3 to the induction coil 2. An electrodeless discharge lamp that does this is being considered. In such an electrodeless discharge lamp, the heat of the coil 2 can be dissipated to the outside air, and the strong electromagnetic field inside the coil 1 can be effectively acted on the discharge gas.
【０００６】このような外巻型の無電極放電ランプ用コ
イルとして、図８に示すような、特開平５−１０１８９
５号公報に開示されたコイルは、出力光遮蔽を最小限に
し、かつコイル断面積を最大にする形状に関するもので
ある。しかし、このような構成で熱対策を行なうには、
非常に大きなコイル断面積が必要になり、安価なコイル
を提供できない、あるいはコイルターン数が限られるの
で大電流を通電する必要がある、といった問題がある。Such an outer winding type electrodeless discharge lamp coil is shown in FIG.
The coil disclosed in Japanese Patent No. 5 relates to a shape that minimizes the output light shield and maximizes the coil cross-sectional area. However, in order to take measures against heat with such a configuration,
There is a problem that an extremely large coil cross-sectional area is required, an inexpensive coil cannot be provided, or a large current needs to be supplied because the number of coil turns is limited.
【０００７】また、図９（ａ），（ｂ）に示すような、
特開平２−１２７５３号公報に開示されたコイルは、コ
イル表面に可視光の反射層２ａを設けることにより光出
力の有効利用を意図している。なお、同図において、２
ｂはコイル導体、２ｃは中間層である。しかし、このよ
うな構成では、ランプからの熱によりコイル材料そのも
のが酸化劣化したり、ランプの点灯、消灯による熱サイ
クルによって、ひび割れが生じたり、材料が軟化しコイ
ル変形によるコイルインピーダンス変化が生じるという
問題がある。Further, as shown in FIGS. 9 (a) and 9 (b),
The coil disclosed in Japanese Patent Application Laid-Open No. 2-12753 intends to effectively utilize the optical output by providing the visible light reflection layer 2a on the coil surface. In the figure, 2
Reference numeral b is a coil conductor, and 2c is an intermediate layer. However, in such a configuration, the coil material itself is oxidatively deteriorated due to heat from the lamp, cracks are generated due to a thermal cycle by turning on and off the lamp, and the material is softened to cause a coil impedance change due to coil deformation. There's a problem.
【０００８】本発明は上記問題点に鑑みなされたもの
で、その目的とするところは、ランプからの熱により高
温になったときに酸化劣化したり、変形したりすること
のない誘導コイルを備えた無電極放電灯を提供すること
にある。The present invention has been made in view of the above problems, and an object of the present invention is to provide an induction coil which is not oxidatively deteriorated or deformed when heated to a high temperature by heat from a lamp. Another object is to provide an electrodeless discharge lamp.
【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
請求項１記載の発明は、放電ガスを封入した透光性材料
よりなるバルブの外側に配置された誘導コイルに高周波
電源より高周波電流を通電し、バルブ内に封入された放
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
スを励起発光させる無電極放電灯において、前記誘導コ
イルの材質を銀とするとともに、該誘導コイルをセラミ
ックス製のコイル形状保持手段を介して前記バルブに固
定し、前記誘導コイルの外面と前記コイル形状保持手段
との間に、高融点の絶縁材料からなる繊維層を介在させ
たことを特徴とするものである。In order to solve the above-mentioned problems, the invention according to claim 1 applies a high-frequency current from a high-frequency power source to an induction coil arranged outside a bulb made of a translucent material in which a discharge gas is sealed. In an electrodeless discharge lamp that energizes and causes a high-frequency electromagnetic field to act on the discharge gas sealed in the bulb to excite the discharge gas to emit light, the induction coil is made of silver, and the induction coil is made of ceramics. The coil shape holding means is fixed to the valve via a coil shape holding means and the outer surface of the induction coil and the coil shape holding means.
And a fiber layer made of a high melting point insulating material
It is characterized in that the.
【００１０】また、請求項２記載の発明は、上記コイル
形状保持手段をバルブの外側に配置した外管に設けたも
のであり、請求項３記載の発明は、コイル形状保持手段
をバルブまたは外管に接着したことを特徴とする。The invention according to claim 2 is one in which the coil shape holding means is provided on an outer pipe arranged outside the valve, and the invention according to claim 3 is that the coil shape holding means is provided on the valve or the outside. it characterized by being adhered to the tube.
【００１１】さらに、請求項４記載の発明は、上記コイ
ル形状保持手段に誘導コイルのコイル内径面積増加時に
コイルピッチが増大する機能を付加したものである。Furthermore, the invention of claim 4, wherein, in which a coil pitch in coil inner diameter area at increased induction coil to the coil shape-retaining means has an additional function to increase.
【００１２】[0012]
【作用】請求項１または請求項２記載の発明によれば、
誘導コイルの材質が銀であるので、高温状態で長期使用
した場合でも酸化劣化することがなく、また、セラミッ
クス製のコイル形状保持手段により保持されているの
で、銀の軟化温度以上での使用においてもコイル形状が
変形せず、誘導コイルの外面とコイル形状保持手段との
間に、高融点の絶縁材料からなる繊維層を介在させたの
で、銀が熱膨張した場合でも、繊維層が膨張分を吸収し
コイル形状保持手段を破損するおそれがない。 According to the invention of claim 1 or 2,
Since the material of the induction coil is silver, it does not undergo oxidative deterioration even when used for a long period of time at high temperature, and since it is held by the coil shape holding means made of ceramics, it can be used at temperatures above the softening temperature of silver. The coil shape does not change, and the outer surface of the induction coil and the coil shape holding means
A fiber layer made of a high melting point insulating material was interposed between
So, even if silver expands thermally, the fiber layer absorbs the expansion.
There is no risk of damaging the coil shape holding means.
【００１３】請求項３記載の発明によれば、コイル形状
保持手段がバルブまたは外管に接着されているので、上
記作用に加えて、コイルとバルブの相対位置がずれな
い。According to the third aspect of the present invention, since the coil shape holding means is adhered to the valve or the outer tube, the relative positions of the coil and the valve do not shift in addition to the above-mentioned action.
【００１４】[0014]
【００１５】[0015]
【００１６】請求項４記載の発明によれば、誘導コイル
のコイル内径面積増加時にコイルピッチが増大するコイ
ル形状保持手段を設けたので、コイルが熱膨張してコイ
ル内径面積が増大したときコイルピッチが増大し、コイ
ルのリアクタンス値は略一定に保たれる。According to the invention as set forth in claim 4, since the coil shape holding means for increasing the coil pitch when the coil inner diameter area of the induction coil is increased is provided, when the coil is thermally expanded and the coil inner diameter area is increased, the coil pitch is increased. Is increased, and the reactance value of the coil is kept substantially constant.
【００１７】[0017]
（実施例１）図１に示すように、バルブ１は石英ガラス
等の透光性材料によって球状に形成されており、その内
部には放電ガスとして希ガスと金属ハロゲン化物が封入
されている。例えば、放電ガスとして１００Torrのキセ
ノンガスと１２mgのＮａＩ−ＴａＩ−ＩｎＩ（ナトリウ
ム沃化物、タリウム沃化物、インジウム沃化物の混合
物）を用いた。なお、バルブ１の形状は球状でなくても
良く、例えば円筒形のような他の形状であっても構わな
い。(Embodiment 1) As shown in FIG. 1, a bulb 1 is formed in a spherical shape by a transparent material such as quartz glass, and a rare gas and a metal halide are enclosed as a discharge gas inside the bulb 1. For example, 100 Torr xenon gas and 12 mg NaI-TaI-InI (mixture of sodium iodide, thallium iodide and indium iodide) were used as the discharge gas. The shape of the valve 1 does not have to be spherical, and may be another shape such as a cylindrical shape.
【００１８】誘導コイル２はバルブ１の外壁面を巻回す
る形で形成されており、その材質は銀であって、コイル
形状が熱等によって変形しないように、セラミックス製
のコイル形状保持手段４が設けられている。この実施例
では、誘導コイル２は３ターン巻回されているが、ター
ン数は特に限定されるものではなく、１ターン以上巻回
されていればよい。また、この実施例では、コイル形状
保持手段４は２ヶ所に設けられているが、その数は特に
限定されるものではなく、コイル２全体を覆う形でもよ
い。The induction coil 2 is formed by winding the outer wall surface of the valve 1. The material of the induction coil 2 is silver, and the coil shape holding means 4 made of ceramic is used to prevent the coil shape from being deformed by heat or the like. Is provided. In this embodiment, the induction coil 2 is wound three turns, but the number of turns is not particularly limited and may be one turn or more. Further, in this embodiment, the coil shape holding means 4 is provided at two places, but the number thereof is not particularly limited, and the coil 2 may be entirely covered.
【００１９】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に接続されている高周波電源（図示せ
ず）を動作させると、誘導コイル２に高周波電流が流
れ、誘導コイル２の周りに電磁場が発生する。このと
き、誘導コイル２は銀で構成されているため電気導電率
が高く、効率良くコイル２に通電できる。この電磁場に
よりバルブ１内部の放電ガスが放電維持される。放電維
持中には、バルブ１内部の電子が電磁場により運動エネ
ルギ−を受け取り、放電ガス原子に衝突しエネルギ−を
与える。放電ガス原子は、電離されたり、励起されたり
する。励起された原子は基底状態に戻るときに発光す
る。この発光を光エネルギ−として利用するのである。In the electrodeless discharge lamp thus constructed, when a high-frequency power source (not shown) connected to the induction coil 2 is operated, a high-frequency current flows through the induction coil 2 and the induction coil 2 is surrounded. An electromagnetic field is generated. At this time, since the induction coil 2 is made of silver, it has a high electric conductivity, and the coil 2 can be efficiently energized. This electromagnetic field maintains discharge of the discharge gas inside the bulb 1. While maintaining the discharge, the electrons inside the bulb 1 receive kinetic energy due to the electromagnetic field and collide with the discharge gas atoms to give energy. The discharge gas atoms are ionized or excited. The excited atoms emit light when returning to the ground state. This light emission is used as light energy.
【００２０】放電維持中、つまりランプ動作中にはバル
ブ１は非常に高温となり、例えば、誘導コイル２の近傍
のバルブ１外壁の温度は約８００℃になる。従って、誘
導コイル２も例えば約７００℃になる。誘導コイル２は
銀で構成されているので、このような高温で長期間使用
しても、ほとんど酸化されず、コイル２の表面が剥離し
たりせず、良好な電気導電率を維持する。また、このよ
うな高温では銀の軟化点を超えており、コイル２の自重
によりコイル２の形状が変形しがちであるが、本実施例
ではセラミックス製のコイル形状保持手段４でコイル２
を保持しているので、熱による変形を抑制する効果があ
り、長期間、コイル２のコイル２のインピーダンスを変
化させない。During discharge maintenance, that is, during lamp operation, the bulb 1 becomes extremely hot, for example, the temperature of the outer wall of the bulb 1 near the induction coil 2 becomes about 800.degree. Therefore, the induction coil 2 also has a temperature of about 700 ° C., for example. Since the induction coil 2 is made of silver, even if it is used at such a high temperature for a long time, it is hardly oxidized, the surface of the coil 2 is not peeled off, and good electric conductivity is maintained. Further, at such a high temperature, the softening point of silver is exceeded, and the shape of the coil 2 tends to be deformed by the weight of the coil 2. However, in this embodiment, the coil shape maintaining means 4 made of ceramics is used to form the coil 2.
Is held, it has an effect of suppressing deformation due to heat, and does not change the impedance of the coil 2 of the coil 2 for a long period of time.
【００２１】（実施例２）本実施例は、図２（ｂ）に示
すように、銀製のコイル２の外面とセラミックス製のコ
イル形状保持手段４との間に、高融点の絶縁材料からな
る繊維層５を介在させたものである。ここでは、石英製
の繊維状スリーブ５が被せられたコイル２の全体をセラ
ミックス製のコイル形状保持手段４で覆うよに構成され
ている。(Embodiment 2) In this embodiment, as shown in FIG. 2B, an insulating material having a high melting point is formed between the outer surface of the silver coil 2 and the ceramic coil shape holding means 4. The fiber layer 5 is interposed. Here, the whole coil 2 covered with the quartz fiber sleeve 5 is configured to be covered with the ceramic coil shape holding means 4.
【００２２】このように構成することにより、コイル２
が熱膨張したときに、その膨張分だけ繊維層５が緩衝材
として機能する。この機能により、バルブ１が非常に高
温になってもコイル形状保持手段４が破損する恐れがな
くなる。また、金属である銀とセラミックスは、通常膨
張係数が大きく異なるが、石英とセラミックスは膨張係
数が近いものが多い。このため、セラミックス製のコイ
ル形状保持手段４によるコイル２の固定がさらに容易に
なる。With this configuration, the coil 2
When is thermally expanded, the fiber layer 5 functions as a cushioning material by the expanded amount. With this function, there is no risk of the coil shape holding means 4 being damaged even if the valve 1 becomes extremely hot. Further, silver and ceramics, which are metals, usually have large expansion coefficients, but quartz and ceramics often have similar expansion coefficients. Therefore, it becomes easier to fix the coil 2 by the coil shape holding means 4 made of ceramics.
【００２３】ところで、コイル形状保持手段４のセラミ
ックス材料として、銀と膨張係数の近い材料を用いたと
しても、実際には銀とセラミックスのなじみはあまり良
くなく、上述の如き繊維層５を介在させることなくコイ
ル２全体をセラミックスで覆うと、熱サイクルによって
ひび割れが生じるが、本実施例のように構成することに
より、そのような不都合はなくなる。By the way, even if a material having a coefficient of expansion close to that of silver is used as the ceramic material of the coil shape maintaining means 4, the compatibility between silver and ceramic is not so good in practice, and the fiber layer 5 as described above is interposed. If the entire coil 2 is covered with ceramics without any cracks, cracks will occur due to the heat cycle. However, the structure of this embodiment eliminates such inconvenience.
【００２４】（実施例３）本実施例は、コイル形状保持
手段４に、前述のコイル形状保持機能に加えて、コイル
２がコイル内径面積変化方向（図３において矢印線の方
向）に自由度を有する機能をもたせたものである。ここ
では、例として図３に示すように、セラミックスで形成
されるコイル形状保持手段４に、高温使用時に熱膨張し
たコイル２がその径方向に移動可能な溝４ａを設けたも
のである。(Embodiment 3) In this embodiment, in addition to the above-mentioned coil shape holding function, the coil shape holding means 4 has a degree of freedom in the direction in which the coil 2 changes the coil inner diameter area (the direction of the arrow in FIG. 3). It has the function of having. Here, as an example, as shown in FIG. 3, the coil shape holding means 4 formed of ceramics is provided with a groove 4a in which the coil 2 thermally expanded during high temperature use is movable in its radial direction.
【００２５】このように、誘導コイル２の材質が銀であ
るため、誘導コイル２は高温使用時にも酸化せず、ま
た、コイル形状保持手段４はコイル内径面積変化方向に
自由度を有するので、高温使用時にコイル２が熱膨張す
るような場合においても、コイル２は自由度のある方向
に伸び、コイル形状保持手段４を破損させるおそれがな
い。さらに、コイル２のピッチ方向には自由度がないた
め、コイル間の短絡の心配がなく、電気絶縁も同時に確
保される。従って、コイル２のピッチ方向に重力が働く
ような態様でランプを点灯動作させるときに特に有効で
ある。As described above, since the material of the induction coil 2 is silver, the induction coil 2 does not oxidize even when used at high temperature, and the coil shape holding means 4 has a degree of freedom in the direction in which the inner diameter of the coil changes. Even when the coil 2 thermally expands during use at high temperature, the coil 2 extends in a direction having a degree of freedom and there is no risk of damaging the coil shape holding means 4. Further, since there is no degree of freedom in the pitch direction of the coil 2, there is no fear of short circuit between the coils, and electrical insulation is secured at the same time. Therefore, it is particularly effective when the lamp is operated so that gravity acts in the pitch direction of the coil 2.
【００２６】なお、本実施例ではコイル形状保持手段４
はセラミックス製としたが、ガラス製でも良いのは勿論
である。セラミックス製とすれば、高温で長時間使用し
た場合においても信頼性が高く、ガラス製であれば、コ
イル形状保持手段４をバルブ１に容易に融着できる。In this embodiment, the coil shape holding means 4 is used.
Is made of ceramics, but it is needless to say that it may be made of glass. If it is made of ceramics, it is highly reliable even when it is used at high temperature for a long time, and if it is made of glass, the coil shape holding means 4 can be easily fused to the valve 1.
【００２７】（実施例４）本実施例は、コイル形状保持
手段４に、誘導コイル２のコイル内径面積増加時にコイ
ルピッチが増大する機能を付加したものであり、例とし
てここでは図４に示すように、コイル形状保持手段４の
形状を、バルブ１側が小なるくさび状とするとともに、
その中央部にコイル径方向にコイル２が移動可能な溝４
ａを設け、その溝４ａに３ターンよりなる誘導コイル２
の中央巻線が位置し、上下の巻線がそれぞれくさび状保
持手段４の両テーパ部４ｂ，４ｃに位置するように配置
したものである。(Embodiment 4) In this embodiment, the coil shape holding means 4 is provided with a function of increasing the coil pitch when the area of the coil inner diameter of the induction coil 2 is increased. As described above, the shape of the coil shape holding means 4 is formed in a wedge shape on the valve 1 side, and
A groove 4 in the center of which the coil 2 can move in the coil radial direction
a is provided, and the induction coil 2 has 3 turns in its groove 4a.
The central winding is located, and the upper and lower windings are located on both taper portions 4b and 4c of the wedge-shaped holding means 4, respectively.
【００２８】このように構成したことにより、高温使用
時にコイル２が熱膨張しコイル内径面積増大すると、図
４（ｂ）に示すように、コイル２はコイルピッチが増大
する方向に移動する。従って、コイル２が膨張しコイル
内径面積が増大したときコイルピッチが増大するので、
コイル２のリアクタンス値は略一定に保たれる（コイル
内径面積が増大するとリアクタンスは増大し、コイルピ
ッチが増大するとリアクタンスは減少する）。With this configuration, when the coil 2 thermally expands and the inner diameter of the coil increases during high temperature use, the coil 2 moves in a direction in which the coil pitch increases, as shown in FIG. 4 (b). Therefore, when the coil 2 expands and the coil inner diameter area increases, the coil pitch increases,
The reactance value of the coil 2 is kept substantially constant (the reactance increases as the coil inner diameter area increases, and the reactance decreases as the coil pitch increases).
【００２９】このことにより、例えば、ランプ始動時の
ようにコイル温度が室温の場合も、ランプ点灯動作中の
ようにコイル温度が非常に高温の場合でも、コイル２の
リアクタンス値は略一定に保たれるので、高周波電源内
の整合回路の設計が容易になる。As a result, the reactance value of the coil 2 is kept substantially constant even when the coil temperature is room temperature, for example, when the lamp is started, and when the coil temperature is extremely high, such as during the lamp lighting operation. In the high frequency power supply because it will lean
It becomes easy to design the matching circuit.
【００３０】なお、本実施例ではコイル形状保持手段４
はセラミックス製としたが、ガラス製でも良いのは勿論
である。In this embodiment, the coil shape holding means 4
Is made of ceramics, but it is needless to say that it may be made of glass.
【００３１】（実施例５）図５は第５の実施例を示すも
ので、前記バルブ１は外管６によって被われており、バ
ルブ１と外管６の間は真空に保たれ、誘導コイル２は外
管６の外周壁に沿って配置されている。なお、誘導コイ
ル２およびコイル形状保持手段４は前記実施例２で示し
たものと同様の構成であるので説明を省略する。(Embodiment 5) FIG. 5 shows a fifth embodiment, in which the valve 1 is covered with an outer tube 6, a vacuum is maintained between the valve 1 and the outer tube 6, and an induction coil is used. 2 is arranged along the outer peripheral wall of the outer tube 6. Since the induction coil 2 and the coil shape holding means 4 have the same configurations as those shown in the second embodiment, their description will be omitted.
【００３２】ところで、一般に無電極放電ランプでは、
バルブ１とコイル２の相対位置により結合状態が決定さ
れ、その位置が設計値からずれると不都合が生じる。こ
のような位置ずれを防止するのに本実施例は有効なもの
である。すなわち、誘導コイル２の形状を保持するセラ
ミックス製のコイル形状保持手段４と外管６との接着が
本実施例では下記の方法により容易に行える。By the way, in general, in an electrodeless discharge lamp,
If the connection state is determined by the relative position of the valve 1 and the coil 2 and the position deviates from the designed value, inconvenience occurs. The present embodiment is effective in preventing such positional displacement. That is, the ceramic coil shape holding means 4 for holding the shape of the induction coil 2 and the outer tube 6 can be easily bonded by the following method in this embodiment.
【００３３】まず、予めコイル状に巻回された誘導コイ
ル２を外管６の外周壁に多少隙間をあけて配置し、その
誘導コイル２にバインダー液にセラミックス粉末が含有
された、いわゆる液状セラミックスを塗布し、その後、
熱処理を施すことによりバインダーが除去され、セラミ
ックスが固体状に固まると共に外管６と接着して固定さ
れる。勿論、コイル状に巻回された誘導コイル２に液状
セラミックスを塗布したものを外管６にはめ込み、その
後、熱処理して固定してもよい。First, the induction coil 2 wound in advance in a coil shape is arranged on the outer peripheral wall of the outer tube 6 with a slight gap, and the induction coil 2 contains a ceramic powder in a binder liquid, so-called liquid ceramics. And then
The heat treatment removes the binder, solidifies the ceramics, and bonds and fixes them to the outer tube 6. Needless to say, the induction coil 2 wound in a coil shape, which is coated with liquid ceramics, may be fitted into the outer tube 6 and then heat treated and fixed.
【００３４】[0034]
【発明の効果】請求項１または請求項２記載の発明によ
れば、誘導コイルの材質が銀であるので、高温状態で長
期使用しても、誘導コイルが酸化劣化せず、長期間にわ
たり高い電気導電率を維持できるという効果があり、ま
た、セラミックス製のコイル形状保持手段により保持さ
れているので、銀の軟化温度以上での使用においてもコ
イル形状が変形したり、コイル巻線間の絶縁破壊が生じ
たりせず、さらに、セラミックス製であるので高温下で
の長期使用においても信頼性が高く、誘導コイルの外面
とコイル形状保持手段との間に、高融点の絶縁材料から
なる繊維層を介在させたので、銀が熱膨張した場合で
も、繊維層が膨張分を吸収しコイル形状保持手段を破損
するおそれがない。結果として、長寿命の無電極放電灯
を提供できる。According to the invention of claim 1 or 2, since the material of the induction coil is silver, the induction coil does not undergo oxidative deterioration even if it is used for a long time in a high temperature state, and is high for a long time. It has the effect of maintaining electrical conductivity, and because it is held by the coil shape holding means made of ceramics, the coil shape is deformed even when used above the softening temperature of silver, and insulation between coil windings destruction does not or occur, Furthermore, since a ceramics reliability in long-term use at high temperatures rather high, the outer surface of the induction coil
Between the coil shape holding means and the coil shape holding means
Since a fiber layer made of
Also, the fiber layer absorbs the expansion and damages the coil shape retention means.
There is no danger of As a result, a long-life electrodeless discharge lamp can be provided.
【００３５】請求項３記載の発明によれば、コイル形状
保持手段がバルブまたは外管に接着されているので、上
記効果に加えて、コイルとバルブの相対位置が変わら
ず、信頼性の高い無電極放電灯を提供できる。According to the third aspect of the invention, since the coil shape holding means is adhered to the valve or the outer tube, in addition to the above effect, the relative position of the coil and the valve does not change, and the reliability is high. An electrode discharge lamp can be provided.
【００３６】[0036]
【００３７】[0037]
【００３８】請求項４記載の発明によれば、誘導コイル
のコイル内径面積増加時にコイルピッチが増大するコイ
ル形状保持手段を設けたので、請求項１、請求項２の効
果に加えて、コイルが熱膨張したときにおいても、コイ
ル内径面積が増大することで増加したコイルリアクタン
ス分が、コイルピッチ増大によるコイルリアクタンス減
少分で補償され、結果としてリアクタンス値は略一定に
保たれる。従って、整合回路の設計が容易な長寿命の無
電極放電灯を提供できる。According to the invention described in claim 4, since the coil shape holding means for increasing the coil pitch when the coil inner diameter area of the induction coil is increased is provided, in addition to the effects of claims 1 and 2, the coil is Even when thermal expansion is performed, the increased coil reactance due to the increase in the coil inner diameter area is compensated for by the decreased coil reactance due to the increased coil pitch, and as a result, the reactance value is kept substantially constant. Therefore, it is possible to provide a long-life electrodeless discharge lamp in which the design of the matching circuit is easy.
【図１】本発明の第１実施例を示す斜視図である。FIG. 1 is a perspective view showing a first embodiment of the present invention.
【図２】本発明の第２実施例の誘導コイル部分を示すも
ので、（ａ）は斜視図、（ｂ）は拡大断面図である。2A and 2B show an induction coil portion of a second embodiment of the present invention, wherein FIG. 2A is a perspective view and FIG. 2B is an enlarged sectional view.
【図３】本発明の第３実施例を示すもので、（ａ）は斜
視図、（ｂ）は断面図である。FIG. 3 shows a third embodiment of the present invention, (a) is a perspective view and (b) is a sectional view.
【図４】本発明の第４実施例の要部を示す断面図で、
（ａ）は低温時、（ｂ）は高温時の誘導コイルの状態を
示すものである。FIG. 4 is a sectional view showing an essential part of a fourth embodiment of the present invention,
(A) shows the state of the induction coil at low temperature, and (b) shows the state of the induction coil at high temperature.
【図５】本発明の第５実施例を示す断面図である。FIG. 5 is a sectional view showing a fifth embodiment of the present invention.
【図６】従来の無電極放電ランプの一例を示す一部断面
の側面図である。FIG. 6 is a side view of a partial cross section showing an example of a conventional electrodeless discharge lamp.
【図７】従来の無電極放電灯の一例を示す概略構成図で
ある。FIG. 7 is a schematic configuration diagram showing an example of a conventional electrodeless discharge lamp.
【図８】従来例に係る誘導コイルの一例を示す断面図で
ある。FIG. 8 is a cross-sectional view showing an example of an induction coil according to a conventional example.
【図９】異なる従来例に係る誘導コイルの一例を示す断
面図である。FIG. 9 is a cross-sectional view showing an example of an induction coil according to another conventional example.
１ バルブ ２ 誘導コイル ３ 高周波電源 ４ コイル形状保持手段 ５ 繊維層 ６ 外管 1 valve 2 induction coil 3 high frequency power supply 4 Coil shape holding means 5 fiber layers 6 outer tube
フロントページの続き (72)発明者 阿南 真一 大阪府門真市大字門真1048番地松下電工 株式会社内 (72)発明者 山本 正平 大阪府門真市大字門真1048番地松下電工 株式会社内 (56)参考文献 特開 平６−84508（ＪＰ，Ａ) 実開 平６−50125（ＪＰ，Ｕ) 実開 平５−59744（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01J 65/04 H05B 41/24 Front page continuation (72) Inventor Shinichi Anan, 1048 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Shohei Yamamoto, 1048, Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Works, Ltd. (56) References Kaihei 6-84508 (JP, A) Actual Kaihei 6-50125 (JP, U) Actual Kaihei 5-59744 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) H01J 65 / 04 H05B 41/24
Claims (4)
バルブの外側に配置された誘導コイルに高周波電源より
高周波電流を通電し、バルブ内に封入された放電ガスに
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
発光させる無電極放電灯において、前記誘導コイルの材
質を銀とするとともに、該誘導コイルをセラミックス製
のコイル形状保持手段を介して前記バルブに固定し、前
記誘導コイルの外面と前記コイル形状保持手段との間
に、高融点の絶縁材料からなる繊維層を介在させたこと
を特徴とする無電極放電灯。1. A high-frequency current is supplied from a high-frequency power source to an induction coil arranged outside a bulb made of a translucent material in which a discharge gas is enclosed, and a high-frequency electromagnetic field is applied to the discharge gas enclosed in the bulb. In the electrodeless discharge lamp that excites the discharge gas to emit light, the material of the induction coil is silver, and the induction coil is fixed to the bulb through a ceramic coil shape holding means.
Between the outer surface of the induction coil and the coil shape holding means
An electrodeless discharge lamp characterized in that a fiber layer made of an insulating material having a high melting point is interposed therebetween .
バルブを透光性材料よりなる外管で被うとともに、外管
の外側に配置された誘導コイルに高周波電源より高周波
電流を通電し、バルブ内に封入され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発光さ
せる無電極放電灯において、前記誘導コイルの材質を銀
とするとともに、該誘導コイルをセラミックス製のコイ
ル形状保持手段を介して前記バルブに固定し、前記誘導
コイルの外面と前記コイル形状保持手段との間に、高融
点の絶縁材料からなる繊維層を介在させたことを特徴と
する無電極放電灯。2. A bulb made of a translucent material filled with a discharge gas is covered with an outer tube made of a translucent material, and a high-frequency current is supplied from a high-frequency power source to an induction coil arranged outside the outer tube. In an electrodeless discharge lamp that excites the discharge gas by causing a high-frequency electromagnetic field to act on the discharge gas sealed in the bulb, the induction coil is made of silver, and the induction coil is made of a ceramic coil. It is fixed to the valve via a holding means and the induction
A high melting point is provided between the outer surface of the coil and the coil shape holding means.
An electrodeless discharge lamp characterized by interposing a fiber layer made of an insulating material at points .
たは外管に接着し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 or 2, wherein the coil shape holding means is bonded to the bulb or the outer tube.
バルブの外側に配置された誘導コイルに高周波電源より
高周波電流を通電し、バルブ内に封入された放電ガスに
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
発光させる無電極放電灯において、前記誘導コイルの材
質を銀とするとともに、該誘導コイルのコイル内径面積
増加時にコイルピッチが増大するコイル形状保持手段を
設けたことを特徴とする無電極放電灯。4. A transparent material filled with a discharge gas.
From the high frequency power supply to the induction coil located outside the valve
Applying high frequency current to the discharge gas enclosed in the bulb
Excitation of discharge gas by applying high frequency electromagnetic field
In the electrodeless discharge lamp that emits light, the material of the induction coil
The quality is silver and the inner diameter of the coil of the induction coil is
A coil shape holding means that increases the coil pitch when increasing
An electrodeless discharge lamp characterized by being provided .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28945894A JP3387242B2 (en) | 1994-11-24 | 1994-11-24 | Electrodeless lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28945894A JP3387242B2 (en) | 1994-11-24 | 1994-11-24 | Electrodeless lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08148125A JPH08148125A (en) | 1996-06-07 |
| JP3387242B2 true JP3387242B2 (en) | 2003-03-17 |
Family
ID=17743533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28945894A Expired - Fee Related JP3387242B2 (en) | 1994-11-24 | 1994-11-24 | Electrodeless lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3387242B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6121730A (en) * | 1998-06-05 | 2000-09-19 | Matsushita Electric Works R&D Laboratory, Inc. | Metal hydrides lamp and fill for the same |
| US8466609B2 (en) * | 2008-10-31 | 2013-06-18 | General Electric Company | Method and apparatus for positioning a ceramic induction discharge body relative to an induction coil |
-
1994
- 1994-11-24 JP JP28945894A patent/JP3387242B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08148125A (en) | 1996-06-07 |
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