JPH08236074A - Ring-shaped fluorescent lamp - Google Patents
Ring-shaped fluorescent lampInfo
- Publication number
- JPH08236074A JPH08236074A JP33061395A JP33061395A JPH08236074A JP H08236074 A JPH08236074 A JP H08236074A JP 33061395 A JP33061395 A JP 33061395A JP 33061395 A JP33061395 A JP 33061395A JP H08236074 A JPH08236074 A JP H08236074A
- Authority
- JP
- Japan
- Prior art keywords
- ring
- shaped
- fluorescent lamp
- arc tube
- shaped arc
- 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
- Vessels And Coating Films For Discharge Lamps (AREA)
- Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、複数本の環形発光
管を同心円状に配置した環形蛍光ランプに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring-shaped fluorescent lamp in which a plurality of ring-shaped arc tubes are concentrically arranged.
【０００２】[0002]
【従来の技術】従来、住宅照明を中心として環形蛍光ラ
ンプが広く用いられている。特に、高出力を得るため
に、２本以上の個々の環形蛍光ランプを段違いに配置し
たものが使用されており、また、このような環形蛍光ラ
ンプは専用の照明器具に取り付けて使用されている。従
って、このような照明器具は厚形で大形のものとなるた
め、経済的ではなく、しかも器具デザインの面からも自
由度が制約されるなどの問題を有していた。さらに、２
本以上の環形蛍光ランプと同等の高出力が得られる環形
蛍光ランプ１本を使用した場合にも、環形蛍光ランプ自
身が大型化すると共に、照明器具も大型化してしまい、
経済面、デザイン面で上記と同様の問題が生じる。2. Description of the Related Art Conventionally, ring-shaped fluorescent lamps have been widely used mainly for residential lighting. In particular, in order to obtain high output, one in which two or more individual ring-shaped fluorescent lamps are arranged in different stages is used, and such ring-shaped fluorescent lamps are used by being attached to a dedicated lighting fixture. . Therefore, since such a lighting fixture becomes thick and large-sized, it is not economical and has a problem that the degree of freedom is limited in terms of the design of the fixture. Furthermore, 2
Even when using one ring-shaped fluorescent lamp that can obtain the same high output as the ring-shaped fluorescent lamps of two or more, the ring-shaped fluorescent lamp itself becomes large and the lighting equipment also becomes large,
In terms of economy and design, the same problems as above will occur.
【０００３】[0003]
【発明が解決しようとする課題】上記のような従来の環
形蛍光ランプの問題点を解決するために、図１２に示す
ように、２本のコンパクトなガラス製の環形発光管２
１、２２を同一平面上でかつ同心円状に配置し、それぞ
れの環形発光管２１、２２をガラス管からなるブリッジ
接合部２３によって相互に接合して、内部に一本の放電
路を形成した環形蛍光ランプが提案されている（特開平
２−６１９５６号公報、特開平６−２０３７９８号公
報）。尚、図１２中、２４、２５は電極である。本発明
者等は、これらの環形蛍光ランプについて種々検討を加
えた。その結果、このような環形蛍光ランプでは、従来
の環形蛍光ランプに比べて、環円周に沿った電極取り付
け部を含めた非発光部の面積、すなわち、図１２に示す
距離Ｋが大きくなることが分かった。また、口金を設け
た場合においても、ランプの環円周に沿った配光特性が
劣化し、さらに、口金が大きくなるので、デザイン面で
も問題があることが分かった。また、ランプ形状がコン
パクトである上に、このランプは比較的高負荷で点灯さ
れるため、必然的に水銀蒸気圧を決定する発光管内の最
冷点温度が最適温度領域である４０〜５０℃よりも上昇
してしまい、ランプ光束が蛍光ランプとして本来実現可
能な最大値よりも低下してしまうという問題点があっ
た。また、上記のように非発光部の面積が大きくなる
と、ランプ光束が低下してしまうという問題点もあっ
た。In order to solve the above problems of the conventional ring-shaped fluorescent lamp, as shown in FIG. 12, two compact glass ring-shaped arc tubes 2 are used.
1, 1 and 22 are arranged on the same plane and concentrically, and the ring-shaped arc tubes 21 and 22 are joined to each other by a bridge joint 23 made of a glass tube to form one discharge path inside. Fluorescent lamps have been proposed (Japanese Patent Laid-Open Nos. 2-61956 and 6-203798). In addition, in FIG. 12, 24 and 25 are electrodes. The present inventors have made various studies on these ring-shaped fluorescent lamps. As a result, in such a ring-shaped fluorescent lamp, the area of the non-light-emitting portion including the electrode mounting portion along the ring circumference, that is, the distance K shown in FIG. 12, becomes larger than that of the conventional ring-shaped fluorescent lamp. I understood. Further, even when the base is provided, the light distribution characteristics along the circumference of the ring of the lamp are deteriorated, and the base becomes large, so that it is found that there is a problem in terms of design. In addition, since the lamp shape is compact and the lamp is operated with a relatively high load, the coldest spot temperature in the arc tube that inevitably determines the mercury vapor pressure is 40 to 50 ° C, which is the optimum temperature range. However, there is a problem that the luminous flux of the lamp becomes lower than the maximum value that can be originally realized as a fluorescent lamp. Further, there is a problem that the luminous flux of the lamp is reduced when the area of the non-light emitting portion is increased as described above.
【０００４】本発明は、従来技術における前記課題を解
決するため、非発光面積を小さくすることができると共
に、ランプ光束を高く維持することができ、かつランプ
の環円周に沿った配光特性が良好で、デザイン的にも優
れたコンパクトで高効率・高出力な環形蛍光ランプを提
供することを目的とする。In order to solve the above problems in the prior art, the present invention makes it possible to reduce the non-light emitting area, keep the lamp luminous flux high, and distribute the light along the ring circumference of the lamp. It is an object of the present invention to provide a compact, high-efficiency, high-output ring-shaped fluorescent lamp that has good design and excellent design.
【０００５】[0005]
【課題を解決するための手段】前記目的を達成するた
め、本発明に係る環形蛍光ランプの第１の構成は、一端
部に電極を有し、他端部に閉塞部を有する複数本の環形
発光管が同心円状に配置され、前記複数本の環形発光管
の他端部近傍がブリッジ接合部によって接合されて、内
部に一本の放電路が形成された環形蛍光ランプであっ
て、前記複数本の環形発光管のうち外側に位置する環形
発光管の前記ブリッジ接合部から前記他端部の端面中央
部までの距離をＬ1 （ｍｍ）、内側に位置する環形発光
管の前記ブリッジ接合部から前記他端部の端面中央部ま
での距離をＬ2 （ｍｍ）としたとき、距離Ｌ1 が距離Ｌ
2 よりも長いことを特徴とする。In order to achieve the above object, a first structure of a ring-shaped fluorescent lamp according to the present invention has a plurality of ring-shaped fluorescent lamps having an electrode at one end and a closed portion at the other end. A ring-shaped fluorescent lamp in which arc tubes are arranged concentrically, and a vicinity of the other ends of the plurality of ring-shaped arc tubes are joined by a bridge joint to form a single discharge path therein. L 1 (mm), the distance from the bridge joint of the outer ring-shaped arc tube to the center of the end face of the other end of the ring-shaped arc tube, the bridge joint of the inner ring-shaped arc tube Is L 2 (mm), the distance L 1 is the distance L
Characterized by being longer than 2 .
【０００６】また、前記本発明の第１の構成において
は、複数本の環形発光管が同一平面上に配置されている
のが好ましい。また、前記本発明の第１の構成において
は、Ｌ1 ≧１．３Ｌ2 なる関係を満足するのが好まし
い。In the first structure of the present invention, it is preferable that a plurality of ring-shaped arc tubes are arranged on the same plane. In the first configuration of the present invention, it is preferable that the relationship L 1 ≧ 1.3L 2 is satisfied.
【０００７】また、前記本発明の第１の構成において
は、外側に位置する環形発光管の一端部が、内側に位置
する環形発光管の一端部よりも長いのが好ましい。ま
た、前記本発明の第１の構成においては、ブリッジ接合
部側の管先端部の形状が、環形発光管の中心軸に関して
ほぼ軸対称であるのが好ましい。In the first structure of the present invention, it is preferable that one end of the ring-shaped arc tube located outside is longer than one end of the ring-shaped arc tube located inside. Further, in the first configuration of the present invention, it is preferable that the shape of the tube tip portion on the bridge joint side is substantially axisymmetric with respect to the central axis of the ring-shaped arc tube.
【０００８】また、前記本発明の第１の構成において
は、環形発光管の両端部の外壁面に湾曲用保持部が設け
られているのが好ましい。また、この場合には、環形発
光管の少なくとも非電極側他端部の湾曲用保持部よりも
先端側の内壁面に溝部が設けられているのが好ましい。In the first structure of the present invention, it is preferable that the curved holding portions are provided on the outer wall surfaces of both ends of the ring-shaped arc tube. Further, in this case, it is preferable that at least the groove portion is provided on the inner wall surface of the ring-shaped arc tube at the tip end side of the bending holding portion at the other end portion on the non-electrode side.
【０００９】また、前記本発明の第１の構成において
は、複数本の環形発光管の一端部を包囲して口金が設け
られているのが好ましい。また、前記本発明の第１の構
成においては、複数本の前記環形発光管の一端部及び他
端部をともに包囲して口金が設けられ、かつ、外側に位
置する環形発光管の他端部が外気に触れているのが好ま
しい。また、この場合には、口金に、環形発光管の一端
部と他端部とを熱遮蔽する熱遮蔽部材が設けられている
のが好ましい。Further, in the first structure of the present invention, it is preferable that the base is provided so as to surround one end of the plurality of ring-shaped arc tubes. In the first configuration of the present invention, a base is provided to surround one end and the other end of each of the plurality of ring-shaped arc tubes, and the other end of the ring-shaped arc tube is located outside. Is preferably exposed to the open air. Further, in this case, it is preferable that the base is provided with a heat shielding member that thermally shields one end and the other end of the ring-shaped arc tube.
【００１０】また、前記本発明の第１の構成において
は、環形発光管の非電極側他端部がステムによって封止
されているのが好ましい。また、本発明に係る環形蛍光
ランプの第２の構成は、一端部に電極を有し、他端部に
ステムによって封止された閉塞部を有する複数本の環形
発光管が同一平面上に同心円状に配置され、前記複数本
の環形発光管の他端部近傍がブリッジ接合部によって接
合されて、内部に一本の放電路が形成されると共に、前
記他端部に最冷点箇所が形成された環形蛍光ランプであ
って、前記複数本の環形発光管のうち外側に位置する環
形発光管の前記ブリッジ接合部から前記他端部の端面中
央部までの距離をＬ1 （ｍｍ）、内側に位置する環形発
光管の前記ブリッジ接合部から前記他端部の端面中央部
までの距離をＬ2 （ｍｍ）としたとき、Ｌ1 ≧１．３Ｌ
2 なる関係を満足しており、前記一端部と前記他端部と
を包囲する口金が設けられ、前記口金には、前記最冷点
箇所を外気に触れさせる通気口が設けられ、かつ、前記
環形発光管の前記一端部と前記他端部とを熱遮蔽する熱
遮蔽部材が設けられたことを特徴とする。In the first structure of the present invention, it is preferable that the other end of the ring-shaped arc tube on the non-electrode side is sealed by a stem. In the second configuration of the ring-shaped fluorescent lamp according to the present invention, a plurality of ring-shaped arc tubes having an electrode at one end and a closed portion sealed by a stem at the other end are concentric on the same plane. Are arranged in a circular shape, the vicinity of the other ends of the plurality of ring-shaped arc tubes are joined by a bridge joint, and one discharge path is formed inside, and the coldest spot is formed at the other end. Of the plurality of ring-shaped arc tubes, the distance from the bridge joint of the ring-shaped arc tube located outside to the center of the end face of the other end is L 1 (mm), L 1 ≧ 1.3L, where L 2 (mm) is the distance from the bridge joint of the ring-shaped arc tube located at
2 is satisfied, a mouthpiece that surrounds the one end portion and the other end portion is provided, and the mouthpiece is provided with a vent hole that allows the coldest spot location to be exposed to the outside air, and It is characterized in that a heat shielding member for thermally shielding the one end portion and the other end portion of the annular arc tube is provided.
【００１１】[0011]
【発明の実施の形態】前記本発明の第１の構成によれ
ば、一端部に電極を有し、他端部に閉塞部を有する複数
本の環形発光管が同心円状に配置され、前記複数本の環
形発光管の他端部近傍がブリッジ接合部によって接合さ
れて、内部に一本の放電路が形成された環形蛍光ランプ
であって、前記複数本の環形発光管のうち外側に位置す
る環形発光管の前記ブリッジ接合部から前記他端部の端
面中央部までの距離をＬ1 （ｍｍ）、内側に位置する環
形発光管の前記ブリッジ接合部から前記他端部の端面中
央部までの距離をＬ2 （ｍｍ）としたとき、距離Ｌ1 が
距離Ｌ2 よりも長いことを特徴とするので、外側に位置
する環形発光管の他端部に最冷点箇所が形成され、しか
もその温度を、ランプ光束の最大値に相当する最適な水
銀蒸気圧となるように容易に制御することができる。According to the first aspect of the present invention, a plurality of ring-shaped arc tubes having an electrode at one end and a closing portion at the other end are arranged concentrically, and A ring-shaped fluorescent lamp in which the vicinity of the other end of the ring-shaped arc tube is joined by a bridge joint to form a single discharge path inside, and the ring-shaped fluorescent lamp is located outside the plurality of ring-shaped arc tubes. The distance from the bridge joint of the ring-shaped arc tube to the center of the end face of the other end is L 1 (mm), and from the bridge joint of the ring-shaped arc tube located inside to the center of the end face of the other end. Since the distance L 1 is longer than the distance L 2 when the distance is L 2 (mm), the coldest spot is formed at the other end of the ring-shaped arc tube located outside, and Set the temperature to the optimum mercury vapor pressure that corresponds to the maximum value of the lamp luminous flux. It can be controlled easily.
【００１２】また、前記本発明の第１の構成において、
複数本の環形発光管が同一平面上に配置されているとい
う好ましい例によれば、照明器具を薄形にすることがで
きる。In the first structure of the present invention,
According to the preferable example in which the plurality of ring-shaped arc tubes are arranged on the same plane, the lighting fixture can be made thin.
【００１３】また、前記本発明の第１の構成において、
Ｌ1 ≧１．３Ｌ2 なる関係を満足するという好ましい例
によれば、外側に位置する環形発光管のブリッジ接合部
側の管先端部に、最適水銀蒸気圧を与える最冷点箇所を
確実に形成することができる。Further, in the first configuration of the present invention,
According to the preferable example of satisfying the relationship of L 1 ≧ 1.3L 2, the coldest spot location that gives the optimum mercury vapor pressure is surely provided at the tube tip on the bridge joint side of the annular arc tube located outside. Can be formed.
【００１４】また、前記本発明の第１の構成において、
外側に位置する環形発光管の一端部が、内側に位置する
環形発光管の一端部よりも長いという好ましい例によれ
ば、環形蛍光ランプの有効発光長が長くなり、これによ
ってもランプ光束を増加させることが可能となる。ま
た、環形蛍光ランプの有効発光長が長くなると、環形蛍
光ランプの非発光面積が小さくなるので、配光特性が改
善され、デザイン的にも優れたコンパクトな環形蛍光ラ
ンプが実現される。Further, in the first configuration of the present invention,
According to a preferred example in which one end of the ring-shaped arc tube located outside is longer than one end of the ring-shaped arc tube located inside, the effective emission length of the ring-shaped fluorescent lamp is increased, which also increases the luminous flux of the lamp. It becomes possible. Further, when the effective light emission length of the ring-shaped fluorescent lamp becomes long, the non-light-emitting area of the ring-shaped fluorescent lamp becomes small, so that the light distribution characteristics are improved and a compact ring-shaped fluorescent lamp excellent in design is realized.
【００１５】また、前記本発明の第１の構成において、
ブリッジ接合部側の管先端部の形状が、環形発光管の中
心軸に関してほぼ軸対称であるという好ましい例によれ
ば、ブリッジ接合部側の管先端部の強度が低下すること
はない。Further, in the first configuration of the present invention,
According to a preferable example in which the shape of the tube tip on the bridge joint side is substantially axisymmetric with respect to the central axis of the ring-shaped arc tube, the strength of the tube tip on the bridge joint side does not decrease.
【００１６】また、前記本発明の第１の構成において、
環形発光管の両端部の外壁面に湾曲用保持部が設けられ
ているという好ましい例によれば、ランプ製造工程にお
いて環形発光管の湾曲用保持部をしっかりと保持するこ
とができるので、環形発光管の曲げ精度を高めることが
できる。また、この場合、環形発光管の少なくとも非電
極側他端部の湾曲用保持部よりも先端側の内壁面に溝部
が設けられているという好ましい例によれば、溝部に最
冷点箇所が形成され、その温度を最適値に保つことがで
きる。In the first structure of the present invention,
According to the preferable example in which the curved holding portions are provided on the outer wall surfaces of both ends of the ring-shaped arc tube, the curved holding portions of the ring-shaped arc tube can be firmly held in the lamp manufacturing process. The bending accuracy of the pipe can be improved. Further, in this case, according to a preferable example in which the groove portion is provided on the inner wall surface of the annular arc tube at least on the other end portion on the non-electrode side on the tip side of the holding portion for bending, the coldest spot is formed on the groove portion. Therefore, the temperature can be maintained at the optimum value.
【００１７】また、前記本発明の第１の構成において、
複数本の環形発光管の一端部を包囲して口金が設けられ
ているという好ましい例によれば、電極の熱が環形発光
管の他端部へ伝わって最冷点箇所の温度を最適領域から
過度に上昇させることはない。その結果、ランプ光束が
低下するのを防止することができる。Further, in the first configuration of the present invention,
According to the preferable example in which the base is provided so as to surround one end of the plurality of ring-shaped arc tubes, the heat of the electrode is transferred to the other end of the ring-shaped arc tube and the temperature of the coldest spot is changed from the optimum region. It does not raise excessively. As a result, it is possible to prevent the luminous flux of the lamp from decreasing.
【００１８】また、前記本発明の第１の構成において、
複数本の前記環形発光管の一端部及び他端部をともに包
囲して口金が設けられ、かつ、外側に位置する環形発光
管の他端部が外気に触れているという好ましい例によれ
ば、複数本の環形発光管を安定に保持することができる
と共に、最冷点箇所の温度が最適領域から過度に上昇す
るのを防止することができ、その結果、ランプ光束が低
下するのを防止することができる。また、この場合、口
金に、環形発光管の一端部と他端部とを熱遮蔽する熱遮
蔽部材が設けられているという好ましい例によれば、電
極から最冷点箇所が形成される環形発光管の他端部への
熱の伝わりを抑制することができる。その結果、最冷点
箇所の温度が最適領域から過度に上昇するのをなお一層
確実に防止することができるので、ランプの光束が低下
するのを確実に防止することができる。Further, in the first configuration of the present invention,
According to a preferred example in which a base is provided so as to surround one end and the other end of the plurality of ring-shaped arc tubes together, and the other end of the ring-shaped arc tube located outside is in contact with the outside air, It is possible to stably hold a plurality of ring-shaped arc tubes and prevent the temperature of the coldest spot from excessively rising from the optimum region, and as a result, prevent the luminous flux of the lamp from decreasing. be able to. Further, in this case, according to a preferable example in which the base is provided with a heat shielding member that thermally shields one end and the other end of the ring-shaped arc tube, the ring-shaped light emission in which the coldest spot is formed from the electrode is provided. Heat transfer to the other end of the tube can be suppressed. As a result, it is possible to more reliably prevent the temperature of the coldest spot from excessively rising from the optimum region, and it is possible to reliably prevent the luminous flux of the lamp from decreasing.
【００１９】また、前記本発明の第１の構成において、
環形発光管の非電極側他端部がステムによって封止され
ているという好ましい例によれば、従来構造の場合に比
べて非電極側他端部の強度が向上する。従来構造の場合
には、発光管の一部を溶かして端部を形成するので、特
に管径の大きな発光管では非電極側他端部の肉厚が薄く
なってしまう。これに対し、ステムによって封止する場
合には、端部を強固に封止することができると共に、発
光管の曲げ加工時やランプ完成後の端部の割れ等の不都
合を解消することができる。また、ステムによって封止
する場合には、従来構造の場合に比べて製造が比較的容
易であり、従来の製造設備を使用して製造することがで
きる。In addition, in the first configuration of the present invention,
According to the preferable example in which the other end of the ring-shaped arc tube on the non-electrode side is sealed by the stem, the strength of the other end on the non-electrode side is improved as compared with the case of the conventional structure. In the case of the conventional structure, since the end portion is formed by melting a part of the arc tube, the thickness of the other end portion on the non-electrode side becomes thin especially in the arc tube having a large tube diameter. On the other hand, in the case of sealing with the stem, the end can be firmly sealed, and inconveniences such as bending of the arc tube and cracking of the end after completion of the lamp can be eliminated. . Further, in the case of sealing with the stem, the manufacturing is relatively easy as compared with the case of the conventional structure, and the manufacturing can be performed using the conventional manufacturing equipment.
【００２０】[0020]
【実施例】以下、実施例を用いて本発明をさらに具体的
に説明する。 〈第１の実施例〉図１は本発明に係る環形蛍光ランプの
第１の実施例を示す一部切り欠き正面図、図２は図１の
環形蛍光ランプのブリッジ接合部周辺の構造を示す一部
切り欠き正面図である。図１、図２に示すように、ガラ
ス製の２本の環形発光管１、２は同一平面上でかつ同心
円状に配置されており、環形発光管１、２のそれぞれの
一端部には電極３、４が取り付けられている。また、環
形発光管１、２の他端部１１、１２はそれぞれ閉塞され
ている。環形発光管１、２の他端部１１、１２の近傍
は、ガラス管からなるブリッジ接合部５によって接合さ
れており、これにより発光管内部の電極３、４間に一本
の放電路が形成されている。環形発光管１、２の内表面
には希土類蛍光体６が塗布されており、環形発光管１、
２内には水銀と始動補助用ガス及び緩衝ガスとしてのア
ルゴン、ネオンなどの希ガス（２００〜５００Ｐａ）が
封入されている。尚、水銀は亜鉛−水銀などのアマルガ
ム合金として封入してもよい。EXAMPLES The present invention will be described in more detail below with reference to examples. <First Embodiment> FIG. 1 is a partially cutaway front view showing a first embodiment of a ring-shaped fluorescent lamp according to the present invention, and FIG. 2 shows a structure around a bridge joint portion of the ring-shaped fluorescent lamp of FIG. It is a partially notched front view. As shown in FIG. 1 and FIG. 2, two glass ring-shaped arc tubes 1 and 2 are arranged on the same plane and concentrically, and an electrode is provided at one end of each of the ring-shaped arc tubes 1 and 2. 3 and 4 are attached. The other ends 11 and 12 of the ring-shaped arc tubes 1 and 2 are closed. The vicinity of the other ends 11 and 12 of the ring-shaped arc tubes 1 and 2 are joined by a bridge joint 5 made of a glass tube, whereby a discharge path is formed between the electrodes 3 and 4 inside the arc tube. Has been done. The inner surface of each of the ring-shaped arc tubes 1 and 2 is coated with a rare earth phosphor 6,
2 is filled with mercury, a starting aid gas, and a rare gas (200 to 500 Pa) such as argon and neon as a buffer gas. The mercury may be enclosed as an amalgam alloy such as zinc-mercury.
【００２１】本実施例の環形蛍光ランプは、環形発光管
１、２の管外径がそれぞれ１４ｍｍ、外側に位置する環
形発光管１の環外径が１５０ｍｍ、内側に位置する環形
発光管２の環内径が９０ｍｍとコンパクトな形状をして
おり、ランプ入力２５Ｗで点灯するように設計されてい
る。In the ring-shaped fluorescent lamp of this embodiment, the ring-shaped arc tubes 1 and 2 each have an outer diameter of 14 mm, the outer ring-shaped arc tube 1 has an outer ring diameter of 150 mm, and the inner ring-shaped arc tube 2 has an inner ring-shaped arc tube 2 of 14 mm. It has a compact shape with an inner ring diameter of 90 mm and is designed to light up with a lamp input of 25 W.
【００２２】ブリッジ接合部５の端部から外側に位置す
る環形発光管１の他端部１１の端面中央部までの距離Ｌ
1 は１１ｍｍであり、ブリッジ接合部５の端部から内側
に位置する環形発光管２の他端部１２の端面中央部まで
の距離Ｌ2 は６ｍｍである。また、外側に位置する環形
発光管１の両端部間の中心間距離ｌは１８ｍｍである。
この環形蛍光ランプを、５０ｋＨｚのインバータ回路を
用いてランプ入力２５Ｗで点灯させたところ、色温度３
０００ケルビンの発光色で１６２０ｌｍという高い光束
値が得られた。また、環形発光管１、２の温度を測定し
たところ、外側に位置する環形発光管１の他端部１１に
最冷点箇所が形成されており、最冷点箇所の温度は、２
５Ｗ点灯時（室温２５℃）においてほぼ最大光束値が得
られる最適水銀蒸気圧に相当する４５℃であった。The distance L from the end of the bridge joint 5 to the center of the end face of the other end 11 of the annular arc tube 1 located outside.
1 is 11 mm, and the distance L 2 from the end of the bridge joint 5 to the center of the end face of the other end 12 of the ring-shaped arc tube 2 located inside is 6 mm. Further, the center-to-center distance l between both ends of the ring-shaped arc tube 1 located outside is 18 mm.
When this ring-shaped fluorescent lamp was lit with a lamp input of 25 W using an inverter circuit of 50 kHz, the color temperature was 3
A luminous flux value as high as 1620 lm was obtained with an emission color of 000 Kelvin. Further, when the temperatures of the ring-shaped arc tubes 1 and 2 were measured, the coldest spot was formed at the other end 11 of the ring-shaped arc tube 1 located outside, and the temperature at the coldest spot was 2
The value was 45 ° C., which corresponds to the optimum mercury vapor pressure at which a maximum luminous flux value was obtained at 5 W lighting (room temperature 25 ° C.).
【００２３】本発明者等は、図２２に示すような、ブリ
ッジ接合部２３の端部から外側に位置する環形発光管２
１の他端部２６の端面中央部までの距離Ｌ1′ と、ブリ
ッジ接合部２３の端部から内側に位置する環形発光管２
２の他端部２７の端面中央部までの距離Ｌ2′ とが等し
い従来形の環形蛍光ランプを作製して、ランプの諸特性
を測定した。このランプにおいて、発光管先端部の最冷
点箇所の温度を最適領域に保つための距離Ｌ1′ 、
Ｌ2′ は１３ｍｍであった。このランプを、上記と同様
に５０ｋＨｚのインバータ回路を用いてランプ入力２５
Ｗで点灯させたところ、ランプ光束は１４９０ｌｍの値
を示した。つまり、図１、図２に示す本実施例の環形蛍
光ランプは、図２２に示す従来形の環形蛍光ランプに比
べて１３０ｌｍ（約９％）高い光束値を有することが分
かった。このように高い光束値が得られたのは、ブリッ
ジ接合部５の端部から外側に位置する環形発光管１の他
端部１１の端面中央部までの距離Ｌ1 を、ブリッジ接合
部５の端部から内側に位置する環形発光管２の他端部１
２の端面中央部までの距離Ｌ2 よりも長くしたことによ
り、外側に位置する環形発光管１の他端部１１に最冷点
箇所が形成され、しかもその温度を、ランプ光束の最大
値に相当する最適な水銀蒸気圧となるように容易に制御
することができたからである。さらに、本実施例の環形
蛍光ランプは、電極端部を含めた非発光面積が図２２に
示す従来のものよりも小さくなっており、それだけ環円
周に沿った配光特性が改善されて、ランプデザインの面
でも好ましいものとなっている。The inventors of the present invention have found that the ring-shaped arc tube 2 located outside the end of the bridge joint 23 as shown in FIG.
The distance L 1 ′ to the center of the end face of the other end portion 26 of 1 and the ring-shaped arc tube 2 located inside from the end portion of the bridge joint portion 23
A conventional ring-shaped fluorescent lamp having the same distance L 2 ′ to the center of the end surface of the other end 27 of No. 2 was manufactured, and various characteristics of the lamp were measured. In this lamp, a distance L 1 ′ for keeping the temperature of the coldest spot at the tip of the arc tube in the optimum region,
L 2 ′ was 13 mm. This lamp is connected to the lamp input 25 using the inverter circuit of 50 kHz as above.
When the lamp was turned on at W, the luminous flux of the lamp showed a value of 1490 lm. That is, it was found that the ring-shaped fluorescent lamp of this embodiment shown in FIGS. 1 and 2 has a luminous flux value higher by 130 lm (about 9%) than the conventional ring-shaped fluorescent lamp shown in FIG. Such a high luminous flux value was obtained because the distance L 1 from the end of the bridge joint 5 to the center of the end face of the other end 11 of the ring-shaped arc tube 1 located outside was measured as follows. The other end 1 of the ring-shaped arc tube 2 located inside from the end
By making it longer than the distance L 2 to the center of the end face of No. 2, a coldest spot is formed at the other end 11 of the ring-shaped arc tube 1 located outside, and the temperature is set to the maximum value of the lamp luminous flux. This is because it was possible to easily control the mercury vapor pressure to a corresponding optimum value. Further, the ring-shaped fluorescent lamp of the present embodiment has a non-light emitting area including the electrode end portion smaller than that of the conventional one shown in FIG. 22, and the light distribution characteristic along the ring circumference is improved accordingly. It is also favorable in terms of lamp design.
【００２４】図１、図２に示すように、外側に位置する
環形発光管１の電極端部は、内側に位置する環形発光管
２の電極端部よりも距離Ｓだけ偏位している。このよう
に外側に位置する環形蛍光管１を内側に位置する環形発
光管２よりも長くした場合の効果を調べるために、図３
に示すような、環形発光管１の電極３と環形発光管２の
電極４とを並行させて配置したランプを作製して、ラン
プの諸特性を測定した。このランプを、上記と同様に５
０ｋＨｚのインバータ回路を用いてランプ入力２５Ｗで
点灯させたところ、ランプ光束は１５８０ｌｍの値を示
した。これにより、図１、図２に示す本実施例の環形蛍
光ランプは、外側に位置する環形発光管１の電極端部を
偏位させた効果として、有効発光長が長くなり、光束値
が４０ｌｍ（約３％）高くなることが分かった。さら
に、この場合にも、非発光面積が小さくなり、配光特性
が改善されて、ランプデザインの面でも好ましいものと
なることは明らかである。As shown in FIGS. 1 and 2, the electrode end of the ring-shaped arc tube 1 located outside is offset from the electrode end of the ring-shaped arc tube 2 located inside by the distance S. In order to investigate the effect of making the ring-shaped fluorescent tube 1 located outside in this way longer than the ring-shaped arc tube 2 located inside, as shown in FIG.
A lamp in which the electrode 3 of the ring-shaped arc tube 1 and the electrode 4 of the ring-shaped arc tube 2 are arranged in parallel as shown in Fig. 3 was produced, and various characteristics of the lamp were measured. Replace this lamp with 5
When the lamp was turned on with a lamp input of 25 W using an inverter circuit of 0 kHz, the lamp luminous flux showed a value of 1580 lm. As a result, in the ring-shaped fluorescent lamp of the present embodiment shown in FIGS. 1 and 2, the effective light emission length is increased and the luminous flux value is 40 lm as a result of the electrode end portion of the ring-shaped arc tube 1 located outside being displaced. It was found to be higher (about 3%). Further, also in this case, it is apparent that the non-light emitting area is reduced and the light distribution characteristics are improved, which is also preferable in terms of lamp design.
【００２５】尚、環形発光管１、２のブリッジ接合部５
側の他端部１１、１２は、図４に示すように、管中心部
が突出した形状であってもよい。但し、図５に示すよう
に、環形発光管１、２の他端部１１、１２の形状が管中
心軸に関して非対称の場合には、ガラス先端部の強度が
極端に低下するので好ましくない。いずれにせよ、管先
端部は管中心軸に対してほぼ対称となるような形状に加
工する必要がある。The bridge joint 5 of the ring-shaped arc tubes 1 and 2
As shown in FIG. 4, the other end portions 11 and 12 on the side may have a shape in which the center portion of the pipe is projected. However, as shown in FIG. 5, when the shapes of the other ends 11 and 12 of the ring-shaped arc tubes 1 and 2 are asymmetric with respect to the tube center axis, the strength of the glass front end is extremely reduced, which is not preferable. In any case, it is necessary to process the tip of the pipe into a shape that is substantially symmetrical with respect to the central axis of the pipe.
【００２６】〈第２の実施例〉本実施例では、基本的に
上記第１の実施例と同様の構造（図１、図２）を採用
し、ランプ入力６０Ｗのコンパクトな環形蛍光ランプを
作製した。この環形蛍光ランプの各寸法は、環形発光管
１、２の管外径が２０ｍｍ、外側に位置する環形発光管
１の環外径が２４０ｍｍ、内側に位置する環形発光管２
の環内径が１５５ｍｍ、ブリッジ接合部５の端部から環
形発光管１の他端部１１の端面中央部までの距離Ｌ1 が
１７ｍｍ、ブリッジ接合部５の端部から環形発光管２の
他端部１２の端面中央部までの距離Ｌ2 が１０ｍｍ、環
形発光管１の両端部の中心間距離ｌが２２ｍｍである。
このランプを、５０ｋＨｚのインバータ回路を用いてラ
ンプ入力６０Ｗで点灯させたところ、４５３０ｌｍとい
う高い光束値が得られた。<Second Embodiment> In this embodiment, a structure similar to that of the first embodiment (FIGS. 1 and 2) is basically adopted, and a compact ring fluorescent lamp having a lamp input of 60 W is manufactured. did. The respective dimensions of this ring-shaped fluorescent lamp are as follows: the ring-shaped arc tubes 1 and 2 have an outer diameter of 20 mm, the outer ring-shaped arc tube 1 has a ring outer diameter of 240 mm, and the inner ring-shaped arc tube 2 has a ring outer diameter of 2
Has an inner ring diameter of 155 mm, the distance L 1 from the end of the bridge joint 5 to the center of the end face of the other end 11 of the ring arc tube 1 is 17 mm, and from the end of the bridge joint 5 to the other end of the ring arc tube 2. The distance L 2 to the center of the end face of the portion 12 is 10 mm, and the center-to-center distance l of both ends of the ring-shaped arc tube 1 is 22 mm.
When this lamp was lit with a lamp input of 60 W using an inverter circuit of 50 kHz, a high luminous flux value of 4530 lm was obtained.
【００２７】尚、上記第１及び第２の実施例のランプに
関して、特に外側に位置する環形発光管１のブリッジ接
合部５の端部から他端部１１の端面中央部までの距離Ｌ
1 を種々変えて光束値を測定したところ、最大光束値が
得られる距離Ｌ1 は、環形発光管１、２の管外径をｄと
して、０．５ｄ≦Ｌ1 ≦１．３ｄの範囲にあることが分
かった。また、外側に位置する環形発光管１の他端部１
１に最適水銀蒸気圧を与える最冷点箇所を確実に形成す
るには、距離Ｌ1 と距離Ｌ2 とがＬ1 ≧１．３Ｌ2 なる
関係を満たせばよいことが分かった。Regarding the lamps of the first and second embodiments, the distance L from the end of the bridge joint 5 of the ring-shaped arc tube 1 located on the outer side to the center of the end face of the other end 11 is L.
When the luminous flux value was measured while changing 1 variously, the distance L 1 at which the maximum luminous flux value was obtained was within the range of 0.5d ≦ L 1 ≦ 1.3d, where d was the outer diameter of the ring-shaped arc tubes 1 and 2. I knew it was. The other end 1 of the ring-shaped arc tube 1 located outside
It was found that the distance L 1 and the distance L 2 should satisfy the relationship of L 1 ≧ 1.3L 2 in order to surely form the coldest spot location that gives the optimum mercury vapor pressure to 1 .
【００２８】〈第３の実施例〉本実施例では、上記第１
及び第２の実施例の環形蛍光ランプに口金を取り付けた
環形蛍光ランプについて説明する。<Third Embodiment> In this embodiment, the first
The ring-shaped fluorescent lamp of which the base is attached to the ring-shaped fluorescent lamp of the second embodiment will be described.
【００２９】図６は本発明に係る環形蛍光ランプの第３
の実施例のブリッジ接合部周辺の構造の一例を示す正面
図、図７は本発明に係る環形蛍光ランプの第３の実施例
のブリッジ接合部周辺の構造の他の例を示す正面図であ
る。図６に示す環形蛍光ランプは、環形発光管１、２の
一端部（電極３、４側）が口金７によって包囲されてお
り、他端部１１、１２は口金７から離間されて、外気に
触れた状態にされている。一方、図７に示す環形蛍光ラ
ンプは、環形発光管１、２の一端部（電極３、４側）及
び他端部１１、１２が口金８によって包囲されている。
この場合、口金８には、外側に位置する環形発光管１の
他端部（最冷点箇所）１１を外気に触れさせる通気口１
０が設けられている。このように、外側に位置する環形
発光管１の他端部（最冷点箇所）１１を外気に触れさせ
た状態で、口金７、８を取り付けることにより、電極
３、４の熱が環形発光管１の他端部１１に伝わって最冷
点箇所の温度を過度に上昇させることはないので、ラン
プ光束が低下するのを防止することができる。特に、図
７に示すように、環形発光管１、２の一端部（電極３、
４側）及び他端部１１、１２をともに包囲して口金８を
取り付ければ、環形発光管１、２を安定に保持すること
ができる。FIG. 6 shows a third example of the ring-shaped fluorescent lamp according to the present invention.
FIG. 7 is a front view showing an example of the structure around the bridge joint of this embodiment, and FIG. 7 is a front view showing another example of the structure around the bridge joint of the third embodiment of the ring fluorescent lamp according to the present invention. . In the ring-shaped fluorescent lamp shown in FIG. 6, one ends (electrodes 3 and 4 side) of the ring-shaped arc tubes 1 and 2 are surrounded by a base 7, and the other ends 11 and 12 are separated from the base 7 and are exposed to the outside air. It has been touched. On the other hand, in the ring-shaped fluorescent lamp shown in FIG. 7, one end (on the side of the electrodes 3 and 4) of the ring-shaped arc tubes 1 and 2 and the other ends 11 and 12 are surrounded by the base 8.
In this case, the mouthpiece 1 has a vent hole 1 through which the other end portion (the coldest spot location) 11 of the ring-shaped arc tube 1 located outside is exposed to the outside air.
0 is provided. As described above, the heat of the electrodes 3 and 4 is generated by attaching the bases 7 and 8 in a state where the other end (the coldest spot location) 11 of the ring-shaped arc tube 1 located outside is exposed to the outside air. Since the temperature of the coldest spot is not excessively raised by being transmitted to the other end 11 of the tube 1, it is possible to prevent the luminous flux of the lamp from being lowered. In particular, as shown in FIG. 7, one end portion (electrode 3,
4 side) and the other ends 11 and 12 are both surrounded and the base 8 is attached, so that the ring-shaped arc tubes 1 and 2 can be stably held.
【００３０】ところで、図８に示すように、外側に位置
する環形発光管１の他端部（最冷点箇所）１１を外気に
触れさせる通気口が設けられていない口金９を用いて、
環形発光管１、２の両端部を包囲する場合には、外側に
位置する環形発光管１のブリッジ接合部５の端部から他
端部１１の端面中央部までの距離Ｌ1 を上記第１及び第
２の実施例の場合よりも長くすることにより、完成ラン
プとして組み立てたときの先端部の最冷点箇所の温度が
最適領域から過度に上昇しないように補正する必要があ
る。従って、図８の口金９を用いる場合には、図６、図
７の口金７、８を用いる場合に比べてランプの有効発光
長が短くなり、ランプ光束が低下してしまう。By the way, as shown in FIG. 8, by using a base 9 which is not provided with a vent for exposing the other end (the coldest spot) 11 of the ring-shaped arc tube 1 located outside to the outside air,
When surrounding both ends of the ring-shaped arc tubes 1 and 2, the distance L 1 from the end of the bridge joint portion 5 of the ring-shaped arc tube 1 located outside to the center of the end face of the other end 11 is set to the above first value. Also, by making the length longer than that of the second embodiment, it is necessary to correct the temperature of the coldest spot of the tip when assembled as a completed lamp so as not to excessively rise from the optimum region. Therefore, when the base 9 of FIG. 8 is used, the effective light emission length of the lamp is shorter than that of the bases 7 and 8 of FIGS. 6 and 7, and the luminous flux of the lamp is reduced.
【００３１】〈第４の実施例〉図９は本発明に係る環形
蛍光ランプの第４の実施例のブリッジ接合部周辺の構造
を示す一部切り欠き正面図である。図９に示すように、
口金１３は、環形発光管１、２の一端部（電極３、４
側）と他端部１１、１２とを包囲して取り付けられてい
る。また、口金１３には、外側に位置する環形発光管１
の他端部（最冷点箇所）１１を外気に触れさせる通気口
１０と、環形発光管１、２の一端部（電極３、４側）と
他端部１１、１２とを熱遮蔽する熱遮蔽部材である熱遮
蔽用隔壁１６とが設けられている。この構成によれば、
熱遮蔽用隔壁１６によって電極３、４から最冷点箇所が
形成される環形発光管１の他端部１１への熱の伝わりを
抑制することができるので、最冷点箇所の温度が最適領
域から過度に上昇するのを上記第３の実施例の場合より
もなお一層確実に防止することができる。その結果、ラ
ンプ光束が低下するのを確実に防止することができる。<Fourth Embodiment> FIG. 9 is a partially cutaway front view showing a structure around a bridge joint portion of a fourth embodiment of a ring-shaped fluorescent lamp according to the present invention. As shown in FIG.
The base 13 is one end portion (electrodes 3, 4) of the ring-shaped arc tubes 1, 2.
Side) and the other ends 11 and 12 are attached so as to surround them. In addition, the base 13 has a ring-shaped arc tube 1 located outside.
10 for exposing the other end (cold spot) 11 to the outside air, and heat for shielding one end (electrodes 3, 4 side) of the ring-shaped arc tubes 1, 2 and the other end 11, 12 from heat. A heat shielding partition 16 which is a shielding member is provided. According to this configuration,
Since the heat shielding partition wall 16 can suppress the heat transfer from the electrodes 3 and 4 to the other end 11 of the ring-shaped arc tube 1 where the coldest spot is formed, the temperature of the coldest spot is in the optimum region. It is possible to more reliably prevent the excessive increase from the above in comparison with the case of the third embodiment. As a result, it is possible to reliably prevent the lamp luminous flux from decreasing.
【００３２】〈第５の実施例〉図１０は本発明に係る環
形蛍光ランプの第５の実施例のブリッジ接合部周辺の構
造の一例を示す一部切り欠き正面図である。図１０に示
すように、環形発光管１、２の両端部の外壁面には湾曲
用保持部２０が設けられている。また、環形発光管１、
２の少なくとも非電極側他端部１１、１２には、湾曲用
保持部２０よりも先端側の内壁面に溝部１９が設けられ
ている。他の構成は上記第４の実施例（図９）と同様で
あるため、同一部材には同一の符号を付してその説明は
省略する。この構成によれば、ランプ製造工程において
環形発光管１、２の湾曲用保持部２０をしっかりと保持
することができるので、環形発光管１、２の曲げ精度を
高めることができる。また、この構成によれば、溝部１
９に最冷点箇所が形成され、その温度を最適値に保つこ
とができる。<Fifth Embodiment> FIG. 10 is a partially cutaway front view showing an example of a structure around a bridge joint portion of a fifth embodiment of a ring-shaped fluorescent lamp according to the present invention. As shown in FIG. 10, bending holding portions 20 are provided on the outer wall surfaces of both ends of the ring-shaped arc tubes 1 and 2. In addition, the ring-shaped arc tube 1,
At least at the other end portions 11 and 12 on the non-electrode side of 2, a groove portion 19 is provided on the inner wall surface on the tip side of the bending holding portion 20. Since the other structure is the same as that of the fourth embodiment (FIG. 9), the same reference numerals are given to the same members and the description thereof will be omitted. According to this configuration, since the bending holding portion 20 of the ring-shaped arc tubes 1 and 2 can be firmly held in the lamp manufacturing process, the bending accuracy of the ring-shaped arc tubes 1 and 2 can be improved. Further, according to this configuration, the groove portion 1
The coldest spot is formed at 9, and the temperature can be kept at an optimum value.
【００３３】尚、図１１に示すように、非電極側他端部
１１、１２を、電極側端部と同様のステムによって封止
すれば、図１０に示すような端部構造の場合に比べて非
電極側他端部１１、１２の強度が向上する。図１０に示
す端部構造の場合には、発光管の一部を溶かして端部を
形成するので、特に管径の大きな発光管では非電極側他
端部１１、１２の肉厚が薄くなってしまう。これに対
し、ステムによって封止する場合には、端部を強固に封
止することができると共に、発光管の曲げ加工時やラン
プ完成後の端部の割れ等の不都合を解消することができ
る。また、ステムによって封止する場合には、図１０に
示す端部構造の場合に比べて製造が比較的容易であり、
従来の製造設備を使用して製造することができる。As shown in FIG. 11, if the other end portions 11 and 12 on the non-electrode side are sealed by a stem similar to the end portion on the electrode side, compared to the case of the end portion structure as shown in FIG. As a result, the strength of the other ends 11 and 12 on the non-electrode side is improved. In the case of the end portion structure shown in FIG. 10, since the end portion is formed by melting a part of the arc tube, the non-electrode side other end portions 11 and 12 have a thin wall thickness particularly in the arc tube having a large tube diameter. Will end up. On the other hand, in the case of sealing with the stem, the end can be firmly sealed, and inconveniences such as bending of the arc tube and cracking of the end after completion of the lamp can be eliminated. . Further, in the case of sealing with the stem, the manufacturing is relatively easy as compared with the case of the end structure shown in FIG.
It can be manufactured using conventional manufacturing equipment.
【００３４】[0034]
【発明の効果】以上説明したように、本発明によれば、
ランプの光束値が高く、配光特性が良好で、デザイン的
にも優れたコンパクトで高効率・高出力な環形ランプが
実現される。As described above, according to the present invention,
The luminous flux value of the lamp is high, the light distribution characteristics are good, and it is possible to realize a compact, high-efficiency, high-output ring-shaped lamp with excellent design.
【図１】本発明に係る環形蛍光ランプの第１の実施例を
示す一部切り欠き正面図である。FIG. 1 is a partially cutaway front view showing a first embodiment of a ring-shaped fluorescent lamp according to the present invention.
【図２】図１の環形蛍光ランプのブリッジ接合部周辺の
構造を示す一部切り欠き正面図である。FIG. 2 is a partially cutaway front view showing a structure around a bridge joint portion of the annular fluorescent lamp of FIG.
【図３】本発明の第１の実施例において比較例として作
製した環形蛍光ランプのブリッジ接合部周辺の構造を示
す正面図である。FIG. 3 is a front view showing a structure around a bridge joint portion of a ring-shaped fluorescent lamp manufactured as a comparative example in the first embodiment of the present invention.
【図４】本発明に係る環形蛍光ランプの第１の実施例の
ブリッジ接合部周辺の構造の他の例を示す正面図であ
る。FIG. 4 is a front view showing another example of the structure around the bridge joint portion of the first embodiment of the ring-shaped fluorescent lamp according to the present invention.
【図５】本発明の第１の実施例において図４に対する比
較例として作製した環形蛍光ランプのブリッジ接合部周
辺の構造を示す正面図である。FIG. 5 is a front view showing a structure around a bridge joint portion of a ring-shaped fluorescent lamp manufactured as a comparative example with respect to FIG. 4 in the first embodiment of the present invention.
【図６】本発明に係る環形蛍光ランプの第３の実施例の
ブリッジ接合部周辺の構造の一例を示す正面図である。FIG. 6 is a front view showing an example of a structure around a bridge joint portion of a third embodiment of a ring-shaped fluorescent lamp according to the present invention.
【図７】本発明に係る環形蛍光ランプの第３の実施例の
ブリッジ接合部周辺の構造の他の例を示す正面図であ
る。FIG. 7 is a front view showing another example of the structure around the bridge joint portion of the third embodiment of the ring-shaped fluorescent lamp according to the present invention.
【図８】本発明の第３の実施例において図６、図７に対
する比較例として作製した環形蛍光ランプのブリッジ接
合部周辺の構造を示す正面図である。FIG. 8 is a front view showing a structure around a bridge joint portion of a ring-shaped fluorescent lamp manufactured as a comparative example with respect to FIGS. 6 and 7 in a third embodiment of the present invention.
【図９】本発明に係る環形蛍光ランプの第４の実施例の
ブリッジ接合部周辺の構造を示す一部切り欠き正面図で
ある。FIG. 9 is a partially cutaway front view showing a structure around a bridge joint portion of a ring-shaped fluorescent lamp according to a fourth embodiment of the present invention.
【図１０】本発明に係る環形蛍光ランプの第５の実施例
のブリッジ接合部周辺の構造の一例を示す一部切り欠き
正面図である。FIG. 10 is a partially cutaway front view showing an example of a structure around a bridge joint portion of a ring type fluorescent lamp according to a fifth embodiment of the present invention.
【図１１】本発明に係る環形蛍光ランプの第５の実施例
のブリッジ接合部周辺の構造の他の例を示す一部切り欠
き正面図である。FIG. 11 is a partially cutaway front view showing another example of the structure around the bridge joint portion of the fifth embodiment of the ring-shaped fluorescent lamp according to the present invention.
【図１２】従来の環形蛍光ランプを示す一部切り欠き正
面図である。FIG. 12 is a partially cutaway front view showing a conventional ring-shaped fluorescent lamp.
１、２ 環形発光管 ３、４ 電極 ５ ブリッジ接合部 ６ 蛍光体 ７、８、９、１３ 口金 １０ 通気口 １１、１２ （非電極側）他端部 １６ 熱遮蔽部材 １９ 溝部 ２０ 湾曲用保持部 1, 2 Ring-shaped arc tube 3, 4 Electrode 5 Bridge joint part 6 Fluorescent substance 7, 8, 9, 13 Base 10 Vent hole 11, 12 (non-electrode side) other end 16 Heat shielding member 19 Groove 20 Curvature holding part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 三軒 正嗣 大阪府高槻市幸町１番１号 松下電子工業 株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masatsugu Sangen 1 1-1 Sachimachi Takatsuki, Osaka Prefecture Matsushita Electronics Industrial Co., Ltd.
Claims (12)
有する複数本の環形発光管が同心円状に配置され、前記
複数本の環形発光管の他端部近傍がブリッジ接合部によ
って接合されて、内部に一本の放電路が形成された環形
蛍光ランプであって、前記複数本の環形発光管のうち外
側に位置する環形発光管の前記ブリッジ接合部から前記
他端部の端面中央部までの距離をＬ1 （ｍｍ）、内側に
位置する環形発光管の前記ブリッジ接合部から前記他端
部の端面中央部までの距離をＬ2（ｍｍ）としたとき、
距離Ｌ1 が距離Ｌ2 よりも長いことを特徴とする環形蛍
光ランプ。1. A plurality of ring-shaped arc tubes, each having an electrode at one end and a closed portion at the other end, are arranged concentrically, and a bridge joint portion is provided in the vicinity of the other ends of the plurality of ring-shaped arc tubes. A ring-shaped fluorescent lamp having one discharge path formed therein, the ring-shaped fluorescent lamp being located outside of the plurality of ring-shaped arc tubes, the bridge connecting portion being connected to the other end portion When the distance to the center of the end face is L 1 (mm) and the distance from the bridge joint of the ring-shaped arc tube located inside to the center of the end face of the other end is L 2 (mm),
A ring-shaped fluorescent lamp, characterized in that the distance L 1 is longer than the distance L 2 .
された請求項１に記載の環形蛍光ランプ。2. The ring-shaped fluorescent lamp according to claim 1, wherein a plurality of ring-shaped arc tubes are arranged on the same plane.
求項１又は２に記載の環形蛍光ランプ。3. The ring-shaped fluorescent lamp according to claim 1, wherein the relationship L 1 ≧ 1.3L 2 is satisfied.
内側に位置する環形発光管の一端部よりも長い請求項１
〜３のいずれかに記載の環形蛍光ランプ。4. One end of the ring-shaped arc tube located outside is
The length is longer than one end of the ring-shaped arc tube located inside.
4. The ring-shaped fluorescent lamp according to any one of 3 to 3.
環形発光管の中心軸に関してほぼ軸対称である請求項１
〜４のいずれかに記載の環形蛍光ランプ。5. The shape of the pipe tip on the bridge joint side is
2. A substantially circular symmetry with respect to the central axis of the ring-shaped arc tube.
4. The ring-shaped fluorescent lamp according to any one of to 4.
持部が設けられた請求項１〜５のいずれかに記載の環形
蛍光ランプ。6. The ring fluorescent lamp according to claim 1, wherein a holding portion for bending is provided on the outer wall surface of both ends of the ring arc tube.
の湾曲用保持部よりも先端側の内壁面に溝部が設けられ
た請求項６に記載の環形蛍光ランプ。7. The ring-shaped fluorescent lamp according to claim 6, wherein a groove is provided on an inner wall surface of the ring-shaped arc tube at least at the other end on the non-electrode side on the tip side of the holding portion for bending.
口金が設けられた請求項１〜７のいずれかに記載の環形
蛍光ランプ。8. The ring fluorescent lamp according to claim 1, wherein a base is provided so as to surround one end of each of the plurality of ring arc tubes.
端部をともに包囲して口金が設けられ、かつ、外側に位
置する環形発光管の他端部が外気に触れている請求項１
〜７のいずれかに記載の環形蛍光ランプ。9. A base is provided so as to surround one end and the other end of the plurality of ring-shaped arc tubes, and the other end of the ring-shaped arc tube located outside is in contact with the outside air. 1
7. The ring-shaped fluorescent lamp according to any one of to 7.
とを熱遮蔽する熱遮蔽部材が設けられた請求項９に記載
の環形蛍光ランプ。10. The ring-shaped fluorescent lamp according to claim 9, wherein the base is provided with a heat-shielding member that thermally shields one end and the other end of the ring-shaped arc tube.
によって封止された請求項１〜１０のいずれかに記載の
環形蛍光ランプ。11. The ring-shaped fluorescent lamp according to claim 1, wherein the other end of the ring-shaped arc tube on the non-electrode side is sealed by a stem.
によって封止された閉塞部を有する複数本の環形発光管
が同一平面上に同心円状に配置され、前記複数本の環形
発光管の他端部近傍がブリッジ接合部によって接合され
て、内部に一本の放電路が形成されると共に、前記他端
部に最冷点箇所が形成された環形蛍光ランプであって、
前記複数本の環形発光管のうち外側に位置する環形発光
管の前記ブリッジ接合部から前記他端部の端面中央部ま
での距離をＬ1 （ｍｍ）、内側に位置する環形発光管の
前記ブリッジ接合部から前記他端部の端面中央部までの
距離をＬ2 （ｍｍ）としたとき、Ｌ1 ≧１．３Ｌ2 なる
関係を満足しており、前記一端部と前記他端部とを包囲
する口金が設けられ、前記口金には、前記最冷点箇所を
外気に触れさせる通気口が設けられ、かつ、前記環形発
光管の前記一端部と前記他端部とを熱遮蔽する熱遮蔽部
材が設けられたことを特徴とする環形蛍光ランプ。12. A plurality of ring-shaped light emitting tubes, each having an electrode at one end and a closed portion sealed by a stem at the other end, are arranged concentrically on the same plane, and the plurality of ring-shaped light-emitting tubes are provided. A ring-shaped fluorescent lamp in which the vicinity of the other end of the tube is joined by a bridge joint, and a single discharge path is formed inside, and a coldest spot is formed at the other end.
The distance from the bridge joint of the ring-shaped arc tube located outside of the plurality of ring-shaped arc tubes to the center of the end face of the other end is L 1 (mm), and the bridge of the ring-shaped arc tube located inside When the distance from the joining portion to the center of the end face of the other end is L 2 (mm), the relationship L 1 ≧ 1.3L 2 is satisfied, and the one end and the other end are surrounded. Is provided with a vent for allowing the coldest spot to come into contact with the outside air, and a heat shielding member for thermally shielding the one end and the other end of the annular arc tube. A ring-shaped fluorescent lamp characterized by being provided with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33061395A JP2788621B2 (en) | 1994-12-28 | 1995-12-19 | Ring fluorescent lamp |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32780994 | 1994-12-28 | ||
| JP6-327809 | 1994-12-28 | ||
| JP33061395A JP2788621B2 (en) | 1994-12-28 | 1995-12-19 | Ring fluorescent lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08236074A true JPH08236074A (en) | 1996-09-13 |
| JP2788621B2 JP2788621B2 (en) | 1998-08-20 |
Family
ID=26572649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33061395A Expired - Lifetime JP2788621B2 (en) | 1994-12-28 | 1995-12-19 | Ring fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2788621B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5977692A (en) * | 1997-03-31 | 1999-11-02 | Matsushita Electronics Corporation | Annulus fluorescent lamp with overheat protection |
| JP2007324076A (en) * | 2006-06-05 | 2007-12-13 | Matsushita Electric Ind Co Ltd | Circular fluorescent lamp |
| JP2010009883A (en) * | 2008-06-25 | 2010-01-14 | Panasonic Electric Works Co Ltd | Plane spiral type fluorescent lamp and luminaire |
| JP2013004339A (en) * | 2011-06-17 | 2013-01-07 | Hitachi Appliances Inc | Circular fluorescent lamp and lighting fixture |
-
1995
- 1995-12-19 JP JP33061395A patent/JP2788621B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5977692A (en) * | 1997-03-31 | 1999-11-02 | Matsushita Electronics Corporation | Annulus fluorescent lamp with overheat protection |
| JP2007324076A (en) * | 2006-06-05 | 2007-12-13 | Matsushita Electric Ind Co Ltd | Circular fluorescent lamp |
| JP2010009883A (en) * | 2008-06-25 | 2010-01-14 | Panasonic Electric Works Co Ltd | Plane spiral type fluorescent lamp and luminaire |
| JP2013004339A (en) * | 2011-06-17 | 2013-01-07 | Hitachi Appliances Inc | Circular fluorescent lamp and lighting fixture |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2788621B2 (en) | 1998-08-20 |
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