JP5551117B2

JP5551117B2 - Annular fluorescent lamp and lighting fixture

Info

Publication number: JP5551117B2
Application number: JP2011135010A
Authority: JP
Inventors: 喜将高橋; 玲夫原田; 太郎本田; 正大市川
Original assignee: Hitachi Appliances Inc
Current assignee: Hitachi Global Life Solutions Inc
Priority date: 2011-06-17
Filing date: 2011-06-17
Publication date: 2014-07-16
Anticipated expiration: 2031-06-17
Also published as: JP2013004339A

Description

本発明は環形蛍光ランプおよび照明器具に関するものである。 The present invention relates to an annular fluorescent lamp and a lighting fixture.

従来より、ガラス管の両端に電極を有する環形蛍光ランプが広く用いられている。これらの環形蛍光ランプを用いて高光束を得るための照明器具として、環の大きさが異なる複数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きた。しかし、このような照明器具は蛍光ランプが段違いに配置されるため器具全体の厚みが大きくなる。この厚みを薄くするため、２つの環形発光管を同心円状に配置し、これらの発光管を相互にいわゆるブリッジ接合により連結し、内部に一つの放電路を形成するようにした環形蛍光ランプが開発された。 Conventionally, an annular fluorescent lamp having electrodes at both ends of a glass tube has been widely used. As a lighting fixture for obtaining a high luminous flux using these annular fluorescent lamps, a lighting apparatus in which a plurality of annular fluorescent lamps having different ring sizes are arranged in stages has been used. However, in such a lighting fixture, the fluorescent lamps are arranged in steps, so that the thickness of the entire fixture increases. To reduce this thickness, an annular fluorescent lamp has been developed in which two annular arc tubes are arranged concentrically and these arc tubes are connected to each other by a so-called bridge junction to form a single discharge path inside. It was done.

しかし、上述のような同心円状環形蛍光ランプは、形状がコンパクトで比較的高負荷であるために、ランプ自身の温度が高くなり、必然的に水銀蒸気圧を決定する最冷点温度が、最適領域である４０〜５０℃よりも上昇してしまい、ランプ光束が低下するという問題が生ずる。この問題を解決するための、例えば特許文献１には、２つの環形発光管のうち外側に位置する環形発光管のブリッジ接合部から対応する端面中央部までの距離を、内側に位置する環形発光管のブリッジ接合部から対応する端面中央部までの距離よりも長くした環形蛍光ランプが提案されている。 However, the concentric annular fluorescent lamp as described above has a compact shape and a relatively high load, so the temperature of the lamp itself is high, and the coldest spot temperature that inevitably determines the mercury vapor pressure is optimal. The temperature rises from 40 to 50 ° C., which is the region, and there is a problem that the lamp luminous flux is lowered. In order to solve this problem, for example, in Patent Document 1, the distance from the bridge junction of the ring-shaped arc tube located outside of the two ring-shaped arc tubes to the corresponding center portion of the end surface is set to the ring-shaped light emission positioned inside. Annular fluorescent lamps have been proposed that are longer than the distance from the bridge junction of the tube to the center of the corresponding end face.

特許第２７８８６２１号公報Japanese Patent No. 2788621

特許文献１に開示された環形蛍光ランプは２つの同心円状環形発光管を連結したものである。さらに高光束のランプを得るためには３つ以上の同心円状環形発光管を連結した環形蛍光ランプを提供することが望まれる。 The annular fluorescent lamp disclosed in Patent Document 1 is obtained by connecting two concentric annular arc tubes. In order to obtain a lamp having a higher luminous flux, it is desired to provide an annular fluorescent lamp in which three or more concentric annular arc tubes are connected.

本発明の目的は、３つ以上の同心円状環形発光管を連結した環形蛍光ランプの最冷点温度を好適に制御するとともに放電長を長くして発光面積を大きくすることができる環形蛍光ランプおよび照明器具を提供することにある。 An object of the present invention is to provide an annular fluorescent lamp capable of suitably controlling the coldest spot temperature of an annular fluorescent lamp in which three or more concentric annular arc tubes are connected and increasing the discharge area by increasing the discharge length. It is to provide a luminaire.

本発明は、上記目的を達成するため以下のような環形蛍光ランプおよび照明器具を提供する。
（１）電極が設けられた電極側端部を一端に有し封止された非電極側端部を他端に有する外側環形発光管と、前記外側環形発光管の内側に同心円状に配置され、電極が設けられた電極側端部を一端に有し封止された非電極側端部を他端に有する内側環形発光管と、前記外側環形発光管と前記内側環形発光管との間に同心円状に配置され、封止された非電極側端部を両端に有する中間環形発光管と、隣接する前記環形発光管同士を前記非電極側端部近傍で連結して一つの放電路を形成するための連結部とを備え、前記外側環形発光管および前記内側環形発光管のうちの一方における非電極側端部と連結部間の距離が、前記一方の環形発光管以外のすべての前記環形発光管における非電極側端部と連結部間の距離よりも長いことを特徴とする環形蛍光ランプ。
（２）前記中間環形発光管が同心円状に複数設けられることを特徴とする上記（１）に記載の環形蛍光ランプ。
（３）前記各環形発光管が同一平面上に配置されることを特徴とする上記（１）または（２）に記載の環形蛍光ランプ。
（４）上記（１）〜（３）のいずれか１項に記載の環形蛍光ランプと、前記環形蛍光ランプを点灯するための点灯装置を有する器具本体とを備えたことを特徴とする照明器具。
（５）前記環形蛍光ランプの前記内側環形発光管における非電極側端部と連結部間の距離が、前記内側環形発光管以外のすべての前記環形発光管における非電極側端部と連結部間の距離よりも長くされ、前記内側環形発光管の非電極側端部が熱伝導部材を介して前記器具本体に接続されることを特徴とする上記（４）に記載の照明器具。 In order to achieve the above object, the present invention provides the following annular fluorescent lamp and lighting fixture.
(1) An outer annular arc tube having an electrode side end provided with an electrode at one end and a sealed non-electrode side end at the other end, and concentrically arranged inside the outer annular arc tube An inner ring arc tube having an electrode side end provided with an electrode at one end and a sealed non-electrode side end at the other end, and between the outer ring arc tube and the inner ring arc tube Concentric circularly arranged and sealed non-electrode side end tubes at both ends and the adjacent ring-shaped arc tubes are connected in the vicinity of the non-electrode side end portions to form one discharge path A distance between a non-electrode side end and the connecting portion in one of the outer ring-shaped arc tube and the inner ring-shaped arc tube is all the ring shapes other than the one ring-shaped arc tube. An annulus characterized by being longer than the distance between the non-electrode side end and the connecting part in the arc tube Light lamp.
(2) The annular fluorescent lamp according to (1), wherein a plurality of the intermediate annular arc tubes are provided concentrically.
(3) The annular fluorescent lamp according to (1) or (2), wherein the annular arc tubes are arranged on the same plane.
(4) A lighting fixture comprising: the annular fluorescent lamp according to any one of (1) to (3) above; and a fixture main body having a lighting device for lighting the annular fluorescent lamp. .
(5) The distance between the non-electrode side end portion and the connecting portion in the inner ring-shaped arc tube of the ring-shaped fluorescent lamp is between the non-electrode side end portion and the connecting portion in all the ring-shaped arc tubes other than the inner ring-shaped arc tube. The non-electrode side end portion of the inner ring-shaped arc tube is connected to the fixture body through a heat conducting member.

請求項１に係る発明によれば、３つ以上の同心円状環形発光管を連結した環形蛍光ランプの最冷点温度を好適に制御するとともに放電長を長くして発光面積を大きくすることができる環形蛍光ランプを得ることができる。
請求項２に係る発明によれば、同心円状環形発光管の数を増やすことでより高光束の環形蛍光ランプを得ることができる。
請求項３に係る発明によれば、３つ以上の同心円状環形発光管を有する環形蛍光ランプ全体の厚さを薄くすることができる。
請求項４に係る発明によれば、３つ以上の同心円状環形発光管を連結した環形蛍光ランプの最冷点温度を好適に制御するとともに放電長を長くして発光面積を大きくすることができる環形蛍光ランプを備えた照明器具を得ることができる。
請求項５に係る発明によれば、内側環形発光管の非電極側端部の最冷点の温度制御を確実に行うことができる。 According to the first aspect of the present invention, it is possible to suitably control the coldest spot temperature of an annular fluorescent lamp in which three or more concentric annular arc tubes are connected, and to increase the discharge length and increase the emission area. An annular fluorescent lamp can be obtained.
According to the second aspect of the invention, an annular fluorescent lamp with a higher luminous flux can be obtained by increasing the number of concentric annular arc tubes.
According to the invention which concerns on Claim 3, the thickness of the whole cyclic | annular fluorescent lamp which has a 3 or more concentric ring-shaped arc_tube | light_emitting_tube can be made thin.
According to the invention of claim 4, the coldest spot temperature of the annular fluorescent lamp in which three or more concentric annular arc tubes are connected can be suitably controlled and the discharge length can be increased to increase the emission area. A luminaire provided with an annular fluorescent lamp can be obtained.
According to the invention which concerns on Claim 5, the temperature control of the coldest point of the non-electrode side edge part of an inner side annular arc tube can be performed reliably.

本発明に係る環形蛍光ランプの一実施例を示す平面図である。It is a top view which shows one Example of the ring-shaped fluorescent lamp which concerns on this invention. 図１の環形蛍光ランプの各発光管の平面断面図である。FIG. 2 is a plan sectional view of each arc tube of the annular fluorescent lamp of FIG. 1. 本発明に係る環形蛍光ランプの他の実施例を示す各発光管の平面断面図である。It is a top sectional view of each arc tube showing other examples of a ring-shaped fluorescent lamp concerning the present invention. 本発明に係る環形蛍光ランプのさらに他の実施例を示す平面図である。It is a top view which shows other Example of the ring-shaped fluorescent lamp which concerns on this invention. 図４の環形蛍光ランプの各発光管の平面断面図である。FIG. 5 is a plan sectional view of each arc tube of the annular fluorescent lamp of FIG. 4. 本発明に係る環形蛍光ランプのさらに他の実施例を示す各発光管の平面断面図である。It is a plane sectional view of each arc tube showing still another embodiment of the ring-shaped fluorescent lamp according to the present invention. 本発明に係る照明器具の一実施例を示す側面図である。It is a side view which shows one Example of the lighting fixture which concerns on this invention. 本発明に係る照明器具の他の実施例を示す側面図である。It is a side view which shows the other Example of the lighting fixture which concerns on this invention. 本発明に係る環形蛍光ランプのさらに他の実施例を示す各発光管の平面断面図である。It is a plane sectional view of each arc tube showing still another embodiment of the ring-shaped fluorescent lamp according to the present invention. 本発明に係る環形蛍光ランプのさらに他の実施例を示す各発光管の平面断面図である。It is a plane sectional view of each arc tube showing still another embodiment of the ring-shaped fluorescent lamp according to the present invention.

図１は、本発明に係る環形蛍光ランプの一実施例を示す平面図である。図２は、図１の環形蛍光ランプの各発光管の平面断面図である。図示のように、環形蛍光ランプ１は、電極１１が設けられた電極側端部１２を一端に有し封止された非電極側端部１３を他端に有する外側環形発光管２と、外側環形発光管２の内側に同心円状に配置され、電極１４が設けられた電極側端部１５を一端に有し封止された非電極側端部１６を他端に有する内側環形発光管３と、外側環形発光管２と内側環形発光管３との間に同心円状に配置され、封止された非電極側端部１７，１８を両端に有する中間環形発光管４とを備える。これらの発光管はガラス管で形成され、水銀および希ガスを含む放電媒体が封入される。本例では３つの環形発光管２，３，４は同一平面上に配置されている。同一平面とは、ほぼ同一の平面を含む概念である。外側環形発光管２と隣接する中間環形発光管４は連結部５で連結されており、また内側環形発光管３と隣接する中間環形発光管４は連結部６で連結されている。これにより、３つの環形発光管２，３，４の内部に、電極１１−連結部５−連結部６−電極１４の経路で一つの放電路が形成される。 FIG. 1 is a plan view showing an embodiment of an annular fluorescent lamp according to the present invention. FIG. 2 is a plan sectional view of each arc tube of the annular fluorescent lamp of FIG. As shown, the annular fluorescent lamp 1 includes an outer annular arc tube 2 having an electrode-side end 12 provided with an electrode 11 at one end and a sealed non-electrode-side end 13 at the other end, and an outer side. An inner annular arc tube 3 which is concentrically arranged inside the annular arc tube 2 and has an electrode side end 15 provided with an electrode 14 at one end and a sealed non-electrode side end 16 at the other end; The intermediate ring-shaped arc tube 4 is disposed concentrically between the outer ring-shaped arc tube 2 and the inner ring-shaped arc tube 3 and has sealed non-electrode side end portions 17 and 18 at both ends. These arc tubes are formed of glass tubes and enclose a discharge medium containing mercury and a rare gas. In this example, the three annular arc tubes 2, 3, and 4 are arranged on the same plane. The same plane is a concept including almost the same plane. The intermediate annular arc tube 4 adjacent to the outer annular arc tube 2 is connected by a connecting portion 5, and the intermediate annular arc tube 4 adjacent to the inner annular arc tube 3 is connected by a connecting portion 6. As a result, one discharge path is formed in the three annular arc tubes 2, 3, 4 through the path of electrode 11 -connecting part 5 -connecting part 6 -electrode 14.

各環形発光管２，３，４の非発光部７は口金８で覆われる。電極１１，１４は図示しないリード線を介して口金８に設けられた口金ピン９，１０にそれぞれ接続される。同心円状に配置された環形発光管２と４の間、および環形発光管３と４の間には、少なくとも一箇所に緩衝部材１９がそれぞれ設けられる。 The non-light emitting portion 7 of each annular arc tube 2, 3, 4 is covered with a base 8. The electrodes 11 and 14 are connected to base pins 9 and 10 provided on the base 8 via lead wires (not shown), respectively. A buffer member 19 is provided at least in one place between the annular arc tubes 2 and 4 and the annular arc tubes 3 and 4 arranged concentrically.

最冷点２０が外側環形発光管２の非電極側端部１３に置かれる場合、連結部５，６は次のように位置決めされる。すなわち、図２に示すように、外側環形発光管２における非電極側端部１３と連結部５間の距離Ｌ１は、外側環形発光管２以外のすべての環形発光管（中間環形発光管４および内側環形発光管３）における非電極側端部１７と連結部５間の距離Ｌ２、非電極側端部１８と連結部６間の距離Ｌ３、および非電極側端部１６と連結部６間の距離Ｌ４よりも長くされる（Ｌ１＞Ｌ２，Ｌ３，Ｌ４）。Ｌ２，Ｌ３，Ｌ４の距離をＬ１より短くすることで放電長を長くして発光面積を大きくすることができる。図２では、Ｌ２〜Ｌ４の距離の関係はＬ２＞Ｌ３＞Ｌ４であるが、これに限定されない。なお、ここで非電極側端部と連結部間の距離は、非電極側端部中央部と連結部の位置する発光管中央部間の距離を意味する。以下同様である。
また、外側環形発光管２の非電極側端部１３と電極側端部１２との距離Ｐ１は、内側環形発光管３の非電極側端部１６と電極側端部１５との距離Ｐ２より広くするとで、更に最冷点２０を好適に制御することが可能である。 When the coldest point 20 is placed at the non-electrode side end portion 13 of the outer ring-shaped arc tube 2, the connecting portions 5 and 6 are positioned as follows. That is, as shown in FIG. 2, the distance L1 between the non-electrode side end 13 and the connecting portion 5 in the outer ring-shaped arc tube 2 is equal to all ring-shaped arc tubes other than the outer ring-shaped arc tube 2 (the intermediate ring-shaped arc tube 4 and The distance L2 between the non-electrode side end portion 17 and the connecting portion 5 in the inner ring-shaped arc tube 3), the distance L3 between the non-electrode side end portion 18 and the connecting portion 6, and the distance between the non-electrode side end portion 16 and the connecting portion 6 It is made longer than the distance L4 (L1> L2, L3, L4). By making the distance between L2, L3 and L4 shorter than L1, the discharge length can be increased and the light emission area can be increased. In FIG. 2, the relationship between the distances L2 to L4 is L2>L3> L4, but is not limited to this. Here, the distance between the non-electrode side end portion and the connecting portion means the distance between the non-electrode side end portion central portion and the arc tube central portion where the connecting portion is located. The same applies hereinafter.
The distance P1 between the non-electrode side end 13 and the electrode side end 12 of the outer ring-shaped arc tube 2 is wider than the distance P2 between the non-electrode side end 16 and the electrode side end 15 of the inner ring-shaped arc tube 3. Then, it is possible to control the coldest point 20 more suitably.

図３、図９は、本発明に係る環形蛍光ランプの他の実施例を示す各発光管の平面断面図である。本実施例が図２に示す実施例と異なる点は、最冷点２０が内側環形発光管３の非電極側端部１６に置かれるところにある。この場合、連結部５，６は次のように位置決めされる。すなわち、図３、図９に示すように、内側環形発光管３における非電極側端部１６と連結部６間の距離Ｌ４は、内側環形発光管３以外のすべての環形発光管（中間環形発光管４および外側環形発光管２）における非電極側端部１８と連結部６間の距離Ｌ３、非電極側端部１７と連結部５間の距離Ｌ２、および非電極側端部１３と連結部５間の距離Ｌ１よりも長くされる（Ｌ４＞Ｌ３，Ｌ２，Ｌ１）。Ｌ３，Ｌ２，Ｌ１の距離をＬ４より短くすることで放電長を長くして発光面積を大きくすることができる。図３、図９では、Ｌ３〜Ｌ１の距離の関係はＬ３＞Ｌ２＞Ｌ１であるが、これに限定されない。
また、内側環形発光管３の非電極側端部１６と電極側端部１５との距離Ｐ２は、外側環形発光管２の非電極側端部１３と電極側端部１２との距離Ｐ１より広くすることで、更に最冷点２０を好適に制御することが可能である。 3 and 9 are plan sectional views of each arc tube showing another embodiment of the annular fluorescent lamp according to the present invention. The present embodiment is different from the embodiment shown in FIG. 2 in that the coldest point 20 is placed at the non-electrode side end portion 16 of the inner annular arc tube 3. In this case, the connecting portions 5 and 6 are positioned as follows. That is, as shown in FIG. 3 and FIG. 9, the distance L4 between the non-electrode side end portion 16 and the connecting portion 6 in the inner ring-shaped arc tube 3 is all ring-shaped arc tubes other than the inner ring-shaped arc tube 3 (intermediate ring-shaped light emission). The distance L3 between the non-electrode side end 18 and the connecting portion 6, the distance L2 between the non-electrode side end 17 and the connecting portion 5, and the non-electrode side end 13 and the connecting portion in the tube 4 and the outer ring-shaped arc tube 2). It is made longer than the distance L1 between 5 (L4> L3, L2, L1). By making the distance between L3, L2 and L1 shorter than L4, the discharge length can be increased and the light emission area can be increased. In FIG. 3 and FIG. 9, the relationship between the distances L3 to L1 is L3>L2> L1, but is not limited to this.
The distance P2 between the non-electrode side end 16 and the electrode side end 15 of the inner ring-shaped arc tube 3 is wider than the distance P1 between the non-electrode side end 13 and the electrode side end 12 of the outer ring-shaped arc tube 2. By doing so, it is possible to further suitably control the coldest spot 20.

図４は、本発明に係る環形蛍光ランプのさらに他の実施例を示す平面図である。図５は、図４の環形蛍光ランプの各発光管の平面断面図である。図示のように、環形蛍光ランプ１は、電極１１が設けられた電極側端部１２を一端に有し封止された非電極側端部１３を他端に有する外側環形発光管２と、外側環形発光管２の内側に同心円状に配置され、電極１４が設けられた電極側端部１５を一端に有し封止された非電極側端部１６を他端に有する内側環形発光管３と、外側環形発光管２と内側環形発光管３との間に同心円状に配置され、封止された非電極側端部１７，１８を両端に有する中間環形発光管４および封止された非電極側端部１７’，１８’を両端に有する中間環形発光管４’とを備える。本例では４つの環形発光管２，３，４，４’は同一平面上に配置されている。外側環形発光管２と隣接する中間環形発光管４は連結部５で連結されており、また内側環形発光管３と隣接する中間環形発光管４は連結部６で連結されている。さらに、中間環形発光管４と隣接する中間環形発光管４’は連結部２２で連結されている。これにより、４つの環形発光管２，３，４，４’の内部に、電極１１−連結部５−連結部２２−連結部６−電極１４の経路で一つの放電路が形成される。 FIG. 4 is a plan view showing still another embodiment of the annular fluorescent lamp according to the present invention. FIG. 5 is a plan sectional view of each arc tube of the annular fluorescent lamp of FIG. As shown, the annular fluorescent lamp 1 includes an outer annular arc tube 2 having an electrode-side end 12 provided with an electrode 11 at one end and a sealed non-electrode-side end 13 at the other end, and an outer side. An inner annular arc tube 3 which is concentrically arranged inside the annular arc tube 2 and has an electrode side end 15 provided with an electrode 14 at one end and a sealed non-electrode side end 16 at the other end; The intermediate annular arc tube 4 and the sealed non-electrode are arranged concentrically between the outer annular arc tube 2 and the inner annular arc tube 3 and have sealed non-electrode side ends 17 and 18 at both ends. And an intermediate annular arc tube 4 ′ having side end portions 17 ′ and 18 ′ at both ends. In the present example, the four annular arc tubes 2, 3, 4, 4 'are arranged on the same plane. The intermediate annular arc tube 4 adjacent to the outer annular arc tube 2 is connected by a connecting portion 5, and the intermediate annular arc tube 4 adjacent to the inner annular arc tube 3 is connected by a connecting portion 6. Further, the intermediate ring arc tube 4 ′ adjacent to the intermediate ring arc tube 4 is connected by a connecting portion 22. As a result, one discharge path is formed in the four annular arc tubes 2, 3, 4, 4 ′ along the path of electrode 11 -connecting part 5 -connecting part 22 -connecting part 6-electrode 14.

各環形発光管２，３，４，４’の非発光部７は口金８で覆われる。電極１１，１４は図示しないリード線を介して口金８に設けられた口金ピン９，１０にそれぞれ接続される。同心円状に配置された環形発光管２と４の間、環形発光管４と４’の間、および環形発光管３と４’の間には、少なくとも一箇所に緩衝部材１９がそれぞれ設けられる。 The non-light emitting portion 7 of each annular arc tube 2, 3, 4, 4 ′ is covered with a base 8. The electrodes 11 and 14 are connected to base pins 9 and 10 provided on the base 8 via lead wires (not shown), respectively. A buffer member 19 is provided at least at one location between the annular arc tubes 2 and 4 arranged concentrically, between the annular arc tubes 4 and 4 ', and between the annular arc tubes 3 and 4'.

最冷点２０が外側環形発光管２の非電極側端部１３に置かれる場合、連結部５，２２，６は次のように位置決めされる。すなわち、図５に示すように、外側環形発光管２における非電極側端部１３と連結部５間の距離Ｌ１は、外側環形発光管２以外のすべての環形発光管（中間環形発光管４，４’および内側環形発光管３）における非電極側端部１７と連結部５間の距離Ｌ２、非電極側端部１８と連結部２２間の距離Ｌ３、非電極側端部１８’と連結部２２間の距離Ｌ４、非電極側端部１７’と連結部６間の距離Ｌ５、および非電極側端部１６と連結部６間の距離Ｌ６よりも長くされる（Ｌ１＞Ｌ２，Ｌ３，Ｌ４，Ｌ５，Ｌ６）。Ｌ２，Ｌ３，Ｌ４，Ｌ５，Ｌ６の距離をＬ１より短くすることで放電長を長くして発光面積を大きくすることができる。図５では、Ｌ２〜Ｌ６の距離の関係はＬ２＞Ｌ３＞Ｌ４＞Ｌ５＞Ｌ６であるが、これに限定されない。
また、外側環形発光管２の非電極側端部１３と電極側端部１２との距離Ｐ１は、内側環形発光管３の非電極側端部１６と電極側端部１５との距離Ｐ２より広くするとで、更に最冷点２０を好適に制御することが可能である。 When the coldest spot 20 is placed at the non-electrode side end portion 13 of the outer ring-shaped arc tube 2, the connecting portions 5, 22, and 6 are positioned as follows. That is, as shown in FIG. 5, the distance L1 between the non-electrode side end 13 and the connecting portion 5 in the outer ring-shaped arc tube 2 is equal to all ring-shaped arc tubes other than the outer ring-shaped arc tube 2 (intermediate ring-shaped arc tube 4, 4 ′ and the inner ring-shaped arc tube 3), the distance L2 between the non-electrode side end 17 and the connecting portion 5, the distance L3 between the non-electrode side end 18 and the connecting portion 22, the non-electrode side end 18 ′ and the connecting portion. 22, the distance L4 between the non-electrode side end portion 17 ′ and the connecting portion 6 and the distance L6 between the non-electrode side end portion 16 and the connecting portion 6 (L1> L2, L3, L4). , L5, L6). By making the distance between L2, L3, L4, L5 and L6 shorter than L1, the discharge length can be increased and the light emission area can be increased. In FIG. 5, the relationship between the distances L2 to L6 is L2>L3>L4>L5> L6, but is not limited to this.
The distance P1 between the non-electrode side end 13 and the electrode side end 12 of the outer ring-shaped arc tube 2 is wider than the distance P2 between the non-electrode side end 16 and the electrode side end 15 of the inner ring-shaped arc tube 3. Then, it is possible to control the coldest point 20 more suitably.

図６、図１０は、本発明に係る環形蛍光ランプのさらに他の実施例を示す各発光管の平面断面図である。本実施例が図５に示す実施例と異なる点は、最冷点２０が内側環形発光管３の非電極側端部１６に置かれるところにある。この場合、連結部５，２２，６は次のように位置決めされる。すなわち、図６、図１０に示すように、内側環形発光管３における非電極側端部１６と連結部６間の距離Ｌ６は、内側環形発光管３以外のすべての環形発光管（中間環形発光管４，４’および外側環形発光管２）における非電極側端部１７’と連結部６間の距離Ｌ５、非電極側端部１８’と連結部２２間の距離Ｌ４、非電極側端部１８と連結部２２間の距離Ｌ３、非電極側端部１７と連結部５間の距離Ｌ２、および非電極側端部１３と連結部５間の距離Ｌ１よりも長くされる（Ｌ６＞Ｌ５，Ｌ４，Ｌ３，Ｌ２，Ｌ１）。Ｌ５，Ｌ４，Ｌ３，Ｌ２，Ｌ１の距離をＬ６より短くすることで放電長を長くして発光面積を大きくすることができる。図６、図１０では、Ｌ５〜Ｌ１の距離の関係はＬ５＞Ｌ４＞Ｌ３＞Ｌ２＞Ｌ１であるが、これに限定されない。
また、内側環形発光管３の非電極側端部１６と電極側端部１５との距離Ｐ２は、外側環形発光管２の非電極側端部１３と電極側端部１２との距離Ｐ１より広くすることで、更に最冷点２０を好適に制御することが可能である。 6 and 10 are plan sectional views of arc tubes showing still another embodiment of the annular fluorescent lamp according to the present invention. This embodiment is different from the embodiment shown in FIG. 5 in that the coldest point 20 is placed on the non-electrode side end portion 16 of the inner annular arc tube 3. In this case, the connecting portions 5, 22, and 6 are positioned as follows. That is, as shown in FIGS. 6 and 10, the distance L6 between the non-electrode side end portion 16 and the connecting portion 6 in the inner ring-shaped arc tube 3 is all ring-shaped arc tubes other than the inner ring-shaped arc tube 3 (intermediate ring-shaped light emission). The distance L5 between the non-electrode side end 17 ′ and the connecting portion 6 in the tubes 4, 4 ′ and the outer ring-shaped arc tube 2), the distance L4 between the non-electrode side end 18 ′ and the connecting portion 22, the non-electrode side end 18 is longer than the distance L3 between the non-electrode side end portion 17 and the connecting portion 5 and the distance L1 between the non-electrode side end portion 13 and the connecting portion 5 (L6> L5). L4, L3, L2, L1). By making the distance between L5, L4, L3, L2, and L1 shorter than L6, the discharge length can be increased and the light emission area can be increased. In FIG. 6 and FIG. 10, the relationship between the distances L5 to L1 is L5>L4>L3>L2> L1, but is not limited to this.
The distance P2 between the non-electrode side end 16 and the electrode side end 15 of the inner ring-shaped arc tube 3 is wider than the distance P1 between the non-electrode side end 13 and the electrode side end 12 of the outer ring-shaped arc tube 2. By doing so, it is possible to further suitably control the coldest spot 20.

環形発光管が５つ以上（中間環形発光管が３つ以上）設けられる場合も、各連結部は上記実施例と同様の仕方で位置決めされる。すなわち、外側環形発光管および内側環形発光管のうちの一方における非電極側端部と連結部間の距離が、その一方の環形発光管以外のすべての環形発光管における非電極側端部と連結部間の距離よりも長くされる。 Even when five or more ring arc tubes (three or more intermediate ring arc tubes) are provided, each connecting portion is positioned in the same manner as in the above embodiment. That is, the distance between the non-electrode side end and the connecting portion in one of the outer ring-shaped arc tube and the inner ring-shaped arc tube is connected to the non-electrode side end in all the ring-shaped arc tubes other than the one ring-shaped arc tube. It is made longer than the distance between the parts.

図７は、本発明に係る照明器具の一実施例を示す側面図である。本実施例では、天井に取付金具１０１を介して照明器具３０を取り付け、照明器具３０と天井との間に隙間１００を設けるように取付けられている。
例えば照明器具３０に使用されている環形発光管は、図２に示す３つの環形発光管２，３，４を連結した環形蛍光ランプ１や図４に示す４つの環形発光管を連結した環形蛍光ランプ１を使用し、環形蛍光ランプ１を点灯するための点灯装置を収納する反射板３２を有する器具本体３１を備え、点灯装置（図示無し）は図示しないコネクタを介して口金８の口金ピンに接続される。そして、環形蛍光ランプ１は１つまたは複数の取付部材３３により器具本体３１に取り付けられ、樹脂製の透光性カバー３４で覆われる。
また、本例で示す照明器具３０に取付けられた環形蛍光ランプ１は、最冷点が外側環形発光管２の非電極側端部に置かれたものである。
そして、照明器具３０では、最冷点の温度上昇を抑制して前記最冷点の温度を好適に保持できるように、天井と照明器具３０との間に隙間１００を設けて照明器具３０の放熱を良くしている。また、反射板３２には傾斜１０２を設け、内側環形発光管３より外側環形発光管２に向かって反射板３２との距離を広げることで外側環形発光管２の前記最冷点部の放熱を良くしている。また、図示なしの点灯装置の発熱部品を前記最冷点の位置とは反対側になるように配置することで前記最冷点の温度上昇を抑えている。 FIG. 7 is a side view showing an embodiment of a lighting fixture according to the present invention. In this embodiment, the lighting fixture 30 is attached to the ceiling via the mounting bracket 101, and the gap 100 is provided between the lighting fixture 30 and the ceiling.
For example, the annular arc tube used in the lighting fixture 30 is an annular fluorescent lamp 1 in which three annular arc tubes 2, 3 and 4 shown in FIG. 2 are connected, and an annular fluorescent lamp in which four annular arc tubes shown in FIG. 4 are connected. A lamp main body 31 having a reflecting plate 32 that houses a lighting device for lighting the annular fluorescent lamp 1 is provided, and the lighting device (not shown) is connected to a base pin of the base 8 via a connector (not shown). Connected. The annular fluorescent lamp 1 is attached to the instrument body 31 by one or a plurality of attachment members 33 and covered with a resin-made translucent cover 34.
Further, in the annular fluorescent lamp 1 attached to the lighting fixture 30 shown in this example, the coldest point is placed at the non-electrode side end of the outer annular arc tube 2.
And in the lighting fixture 30, the clearance gap 100 is provided between the ceiling and the lighting fixture 30 so that the temperature rise of the coldest point can be suppressed and the temperature of the coldest spot can be suitably maintained, and the heat dissipation of the lighting fixture 30 is achieved. Is improving. Further, the reflecting plate 32 is provided with an inclination 102, and the distance from the reflecting plate 32 is increased from the inner ring-shaped arc tube 3 toward the outer ring-shaped arc tube 2, thereby radiating heat at the coldest spot portion of the outer ring-shaped arc tube 2. I'm doing better. Further, the temperature rise of the coldest spot is suppressed by arranging the heat generating components of the lighting device (not shown) so as to be opposite to the position of the coldest spot.

図８は、本発明に係る照明器具の他の実施例を示す側面図である。本実施例が図７の実施例と異なる点は、環形蛍光ランプ１として図３、図９に示す３つの環形発光管２，３，４を連結した環形蛍光ランプを備えたところにあり、他は同様である。この場合、最冷点は図３、図９に示すように内側環形発光管３の非電極側端部に置かれる。本例では、最冷点が位置する内側環形発光管３の非電極側端部（口金８で覆われている）が、熱伝導部材３５を介して器具本体３１、例えばそのシャーシ部に接続される。これにより、最冷点の温度制御を確実に行うことができる。なお、熱伝導部材３５は必須ではなく、必要に応じて設けられるものである。 FIG. 8 is a side view showing another embodiment of a lighting fixture according to the present invention. This embodiment is different from the embodiment of FIG. 7 in that the annular fluorescent lamp 1 is provided with an annular fluorescent lamp in which three annular luminous tubes 2, 3 and 4 shown in FIGS. 3 and 9 are connected. Is the same. In this case, the coldest spot is placed at the non-electrode side end of the inner annular arc tube 3 as shown in FIGS. In this example, the non-electrode side end portion (covered by the base 8) of the inner ring-shaped arc tube 3 where the coldest point is located is connected to the instrument main body 31, for example, its chassis portion via the heat conducting member 35. The Thereby, temperature control of the coldest point can be performed reliably. The heat conducting member 35 is not essential and is provided as necessary.

１環形蛍光ランプ
２外側環形発光管
３内側環形発光管
４、４’ 中間環形発光管
５、６、２２連結部
７非発光部
８口金
９、１０口金ピン
１１，１４電極
１２，１５電極側端部
１３、１６、１７、１７’、１８、１８’ 非電極側端部
１９緩衝部材
２０最冷点
３０照明器具
３１器具本体
３２反射板
３３取付部材
３４透光性カバー
３５熱伝導部材 DESCRIPTION OF SYMBOLS 1 Ring-type fluorescent lamp 2 Outer ring-shaped arc tube 3 Inner ring-shaped arc tube 4, 4 'Intermediate ring-shaped arc tube 5, 6, 22 Connection part 7 Non-light-emitting part 8 Base 9, 10 Base pin 11,14 Electrode 12,15 Electrode side edge Part 13, 16, 17, 17 ', 18, 18' Non-electrode side end 19 Buffer member 20 Coldest point 30 Lighting fixture 31 Appliance body 32 Reflector plate 33 Mounting member 34 Translucent cover 35 Heat conducting member

Claims

An outer ring arc tube having an electrode side end provided with an electrode at one end and a sealed non-electrode side end at the other end, and concentrically arranged inside the outer ring arc tube, An inner ring arc tube having an electrode side end portion provided at one end and a sealed non-electrode side end portion at the other end, and a concentric circle between the outer ring arc tube and the inner ring arc tube An intermediate annular arc tube having a non-electrode side end disposed and sealed at both ends, and the adjacent annular arc tubes are connected in the vicinity of the non-electrode side end to form one discharge path. A connecting portion,
The distance between the non-electrode side end and the connecting portion in one of the outer ring-shaped arc tube and the inner ring-shaped arc tube is the non-electrode side end in all the ring-shaped arc tubes other than the one ring-shaped arc tube. Longer than the distance between the connections , and
The distance between the non-electrode side end and the electrode side end in the one of the outer ring arc tube and the inner ring arc tube is a non-electrode in the other of the outer ring arc tube and the inner ring arc tube. An annular fluorescent lamp characterized by being wider than a distance between a side end and an electrode side end .

The annular fluorescent lamp according to claim 1, wherein a plurality of the intermediate annular arc tubes are provided concentrically.

3. The annular fluorescent lamp according to claim 1, wherein the annular arc tubes are arranged on the same plane.

A lighting fixture comprising: the annular fluorescent lamp according to any one of claims 1 to 3; and a fixture main body having a lighting device for lighting the annular fluorescent lamp.

The distance between the non-electrode side end portion and the connecting portion in the inner ring-shaped arc tube of the ring-shaped fluorescent lamp is more than the distance between the non-electrode side end portion and the connecting portion in all the ring-shaped arc tubes other than the inner ring-shaped arc tube. The lighting fixture according to claim 4, wherein the non-electrode side end portion of the inner annular arc tube is connected to the fixture main body through a heat conducting member.