1280598 (1) 九、發明說明 【發明所屬之技術領域】 本發明是關於冷陰極螢光放電管裝置，特別是關於能 把冷陰極螢光放電管所產生的熱良好排出而達成高亮度化 及長壽命化之冷陰極螢光放電管裝置。 【先前技術】 例如，在平板狀之導光體的側端部配置冷陰極螢光放 電管，讓從放電管所導入的光藉由形成在導光體的下面之 反射薄板進行反射而從導光體的上面射出之背光源，已知 在下述日本專利文獻1中有記載。該背光源具備有包圍放 電管之反射罩，且形成在放電管與導光體的側端部之間之 第1間隙和形成在放電管與反射罩的彎曲面之間第2間隙 幾乎是相等。另外，第1間隙和第2間隙的和大於放電管 的直徑，藉由反射罩使從放電管所照射出的光有良好的反 射來透過到導光體。具備有反射罩之背光源在於其他的下 述公報中也有記載。 下述日本專利文獻2爲在入射到導光體之光的總量不 減少下，防止在於電極部附近減少入射光量而涵蓋射出端 面全體且均等分布亮度之面光源裝置。該面光源裝置具備 有：放電管的直線狀光源、及將入射端部接近配置在直線 狀光源之導光體、及設置在導光體射出面側之擴散構件、 及設置在與導光體射出面的相反側之反射構件、及遮蓋直 線狀光源之燈座，且燈座的內面，將其中央部設爲擴散反 -4- (2)1280598 射面，其 端面入射 下述 的焊接部 將具有直 導光板的 射，而能 達成背光 〔曰 〔曰 〔曰 〔曰 他部分則設爲正反射，而能增大由導光體的入射 的時候之入射效率。 曰本專利文獻3爲在光源反射體設置回授用電線 來強化焊接部之背光源。下述日本專利文獻4爲 角三角形的剖面之一對的導光板予以組合，將從 端面所導入的光幾乎都遇到網點就朝照射方向反 提高光的利用效率，且能利用2片的導光板來能 源的薄形化之平面彩色發光裝置。 本專利文獻1〕 本專利文獻2〕 本專利文獻3〕 本專利文獻4〕 特開平6 — 67025號公報 特開平8 — 27 1 895號公報 特開平1 0 — 1 2026號公報 特開2000 — 2686 1 7號公報 【發明內容】 <發明所欲解決之課題> 例如：電視監視器用等所使用之冷陰極螢光放電管， 對於高亮度化有較高的要求。爲了使放電管高亮度化，考 慮要使每1放電管的管電流（燈電流）增加或是增加配置 在導光體側端面之放電管的管數。但是，由於冷陰極螢光 放電管持有當玻璃管的管壁溫度超過一定溫度就會降低放 電管的亮度之特性，因而即使單是使管電流或放電管的管 數增加，仍會增加玻璃管的管壁溫度，結果是達不到高亮 度。因此，必須抑制玻璃管之管壁溫度的上升，以最適當 的溫度點燈，來提高冷陰極螢光放電管的亮度。 -5- (3) 1280598 因此，本發明之目的是提供即使增加放電管的管數或 增大管電流，仍能抑制玻璃管之管壁溫度的上升來達成高 亮度化及長壽命化之冷陰極螢光放電管裝置。 <用以解決課題之手段> 本發明的冷陰極螢光放電管裝置具備有：管座 (1) 、及具有玻璃管（2a)之冷陰極螢光放電管（2)， ® 冷陰極螢光放電管（2)的兩端部（3)，利用管座（1) 來支撐。在冷陰極螢光放電管（2)的玻璃管（2a)裝配 有複數個導熱性的托架（5)，且使複數個托架（5)可導 熱接觸到管座（1 )。從冷陰極螢光放電管（2 )所產生的 熱，透過托架（5)及可導熱連接到托架（5)之管座 (1 )，而導出到外部，所以能抑制冷陰極螢光放電管 (2) 的溫度上升。另外，玻璃管（2a)因散熱而在局部 產生冷卻部分的狀態下長時間通電，水銀就會集中在冷卻 m w 部分，其他邰分則造成水銀枯竭，而有亮度降低的缺點， 不過由於在構成冷陰極螢光放電管（2 )之玻璃管（2a ) 的複數處接觸托架（5)，又由於玻璃管（2a)的至少發 光區域之長度方向全體均等散熱，故不會局部降低亮度。 利用托架（5)來確實支撐之冷陰極螢光放電管（2)的玻 璃管（2 a )不致於發生移動或變形。再則，利用托架 (5 )就能防止施加外力的時候所造成管座（丨）的變形。> 本發明的實施形態則是使導熱性的托架（5 )接觸到 冷陰極螢光放電管（2)的玻璃管（2a)之長軸方向的全 -6 - (4) 1280598 體，並使托架（5 )可導熱接觸到管座（1 )。 〔發明之效果〕 本發明有下述的效果： 〔1〕利用散熱性的托架來防止冷陰極螢光放電管之 管壁溫度的上升，而能將放電管的管壁溫度維持在最適當 的溫度。 B 〔2〕因此，即使增加冷陰極螢光放電管的管數或增 大管電流，仍能有良好效率使冷陰極螢光放電管發光，而 能達成高亮度化。 〔3〕因長度方向能將冷陰極螢光放電管均等散熱來 進行冷卻，所以能在涵蓋放電管的全部發光區域且均等擴 散的狀態下維持水銀，而達到均等的亮度。 〔4〕即使燈長時間通電，仍不會發生水銀局部枯竭 的狀態，燈的壽命變長，且燈壽命保障期間內不致於降低 ^ 亮度，而能實現高可靠性的冷陰極螢光放電管裝置。 【實施方式】 以下，根據第1圖〜第8圖說明背光源系統所適用之 本發明之冷陰極螢光放電管裝置的實施形態。 如第1圖所示，本發明的冷陰極螢光放電管裝置具備 有：管座（1)、及設在管座（1)的兩端之連接器盒 (7 )、及具有玻璃管（2a)之冷陰極螢光放電管（2)。 冷陰極螢光放電管（2 )的兩端部（3 )利用連接器盒 -7- (5) 1280598 (7)來支撐。玻璃管（2a)形成爲內徑2mm、全長310 mm之直條狀的圓筒形狀，在內部裝塡密封有稀有氣體和 水銀蒸氣’具備有：與玻璃管（2a )的兩端相對向而固定 之一對的電極（未圖示）、及形成在玻璃管（2a)的內壁 之螢光膜、及電連接至電極而從冷陰極螢光放電管（2) 的兩端導出之一對的端子。一對的端子因在於連接器盒 (7 )內連接到導線（8 )，透過導線（8 )連接到放電管 點燈用變頻電路（未圖示），所以放電管點燈用變頻電路 所產生的高電壓，施加給各冷陰極螢光放電管（2)的一 對端子。由上面（1 b )、側面（1 c )以及（底面）所組成 之管座（1)的內壁面（la)，構成將從冷陰極螢光放電 管（2 )所照射出來之光的一部分反射之光反射面。 管座（1 )是由既有高導熱性又有良好的散熱性之下 述的金屬材料或是這些金屬材料的合金所形成。 金屬：導熱率（kcal/m· h· °C) 銅（Cu ) ： 332 鋁（A1 ) : 196 鎂（Mg ) ： 147 鋅（Zn ) :96 如第1圖所示，冷陰極螢光放電管（2)利用配置在 管座（1)內之6個托架（5)來支撐。最好是既有優越的 導熱性又有良好的透光性之托架（5 )，由例如：厚度約3 mm的矽樹脂製的矩形板材所形成。各托架（5 )如第2圖 所示，設有用來裝配一對放電管（2)的缺口部之貫穿孔 -8 - (6) 1280598 (15)，一對的貫穿孔（15)幾乎與構成冷陰極螢光放電 管（2 )之玻璃管（2a )的剖面形狀相等。圓形剖面之貫 穿孔（15)的內徑，實質上與構成冷陰極螢光放電管 (2 )之玻璃管（2a )的外徑相等，例如：以約2 mm的直 徑所形成，在將冷陰極螢光放電管（2 )安配到托架（5 ) 的貫穿孔（15)內時，延伸於冷陰極螢光放電管（2)的 兩端部（3 )之間之中間部（4 )，即是玻璃管（2a )之發 ® 光區域的外壁接觸到貫穿孔（1 5 )的內壁。藉由此方式， 將冷陰極螢光放電管（2)確實保持在管座（1)內的預定 位置，並且能將玻璃管（2a )的發熱傳達到托架（5 )。 托架（5 )如第1圖所示，以幾乎等間隔裝配6個在管座 (1)內其一端與另一端之間，幾乎涵蓋全長來支撐已插 入到貫穿孔（1 5 )之冷陰極螢光放電管（2 )的中間部 (4 )。托架（5 )的頂面（5a)、內側側面（5b )以及底 面（5 c )，分別接觸到管座（1 )的上面（1 b )、側面 (1 c )以及底面（1 d )，托架（5 )緊貼於管座（1 )。托 架（5 )的外側側面（5d )露出管座（1 )的開口面 (1 e ) ° 本實施形態，形成在一對的連接器盒（7 )之間之開 口面（1 e )的間隙長度（一對的連接器盒（7 )的對向間 隔）L設爲29 8 mm，托架（5 )的厚度設爲3 mm。以等間 隔配置在一對的連接器盒（7 )間之托架（5 )所相鄰的間 隔和配置在兩端之托架（5 )與連接器盒（7 )的間隔都爲 約 4 mm 〇 -9- (7) 1280598 當作液晶顯示器等的光源來使用之背光源如第4圖所 示’具備有：由透光性的樹脂材等所構成之板狀的導光體 (10)、及配置在導光體（10)的兩端之前述冷陰極螢光 放電管裝置。一對的冷陰極螢光放電管裝置，分別配置在 導光體（10)其中一方的端部（1〇〇及另一方的端部 (l〇d)，各冷陰極螢光放電管裝置的管座（1)，沿著導 光體（10)其中一方的端面（10c)及另一方的端面 ® ( 1 0d )延伸，連接器盒（7 )和6個托架（5 )的外側側 面（5 d )，分別抵接到導光體（1 0 )其中一方的端面 (l〇c)及另一方的端面（10d)。因此，冷陰極螢光放電 管（2 )利用導光體（10 )的端面（l〇c、l〇d )及托架 (5 )來包圍。導光體（1 0 )最好是由透光性和耐熱性都 優越的各種樹脂材料來形成，例如是由丙烯酸樹脂來形 成。 在導光體（10)另一方的主面（l〇e)黏貼有反射薄 ^ 板（圖示省略）。另外，如第4圖所示，配置在導光體 (10 )另一方的主面（l〇e )側之外部散熱板（12 )的兩 端，連接到管座（1 )的底面（1 d )，所以冷陰極螢光放 電管（2)透過複數個托架（5)可導熱連接到管座 (1 )、外部散熱板（12 )。外部散熱板（12 )由例如： 鋅（Zn)、鋁（A1)、銅（Cu)等導熱性良好的金屬材料 所形成，具有將由托架（5 )和管座（1 )所傳達之冷陰極 螢光放電管（2 )的熱導出到外部之功能。 管座（1)的內壁（la)，構成塗上白色塗料或施予 -10- (8) 1280598 鍍鉻來將由冷陰極螢光放電管（2)所照射的光反射之 面。但是，管座（1 )本身由光反射率較高的材料所形成 時，則不一定要在內壁（la)塗上白色塗料或施予鍍鉻 等。由於管座（1)的內壁（la)爲光反射面，因而管座 (1 )爲構成將光引導到導光體（10)之反射板。然而， 從冷陰極螢光放電管（2 )呈放射狀照射出之光當中導光 體（10 )所導出的光，從端面（10c、10d )直接入射到導 ® 光體（1 〇 )，從冷陰極螢光放電管（2 )呈放射狀照射出 之光當中照射到管座（1 )側之光在以管座（1 )的內壁 (1 a )反射過後，從端面（1 0 c、1 0 d )入射到導光體 (10)。入射到導光體（10)之光，在於導光體（10)的 內部一面反覆反射一面傳送，從導光體（10)其中一方的 主面（l〇f)呈面狀發光。 本實施形態的冷陰極螢光放電管裝置，有下述的作用 效果： β 〔 1〕因能透過托架（5 )以及導熱連接到托架（5 ) 之管座（1 )，將從放電管（2 )所產生的熱導出到外部， 所以能抑制放電管（2 )的溫度上升。 〔2〕還能透過連接到管座（1 )之外部散熱板（1 2 ) 將從放電管（2 )所產生的熱良好導出到外部。 〔3〕透過以等間隔接觸到冷陰極螢光放電管（2 )的 複數處之托架（5)，就能涵蓋長度方向的全體將冷陰極 螢光放電管（2)幾乎均等導熱。 〔4〕因設有有透光性之托架（5 )，所以陰影等的暗 -11 - (9) 1280598 部不會形成在托架（5)的周邊部。 〔5〕使接觸到冷陰極螢光放電管（2)的複數處之托 架（5 )增減數量，就很容易依照管電流來調整冷陰極螢 光放電管（2)的散熱量。 〔6〕因利用複數個托架（5)確實支撐冷陰極螢光放 電管（2 )的中間部（4 )，所以冷陰極螢光放電管（2 ) 不容易造成移動或是變形，而能實現高可靠性的冷陰極螢 #光放電管裝置。 〔7〕當對管座（1 )施加外力或是熱時，利用配置在 管座（1)內之複數個托架（5)就能良好防止管座（1) 的變形。 本發明的實施形態可作種種的變更。例如，如第5圖 所示，也可以將突起部（5 e )與托架（5 ) —體形成在托 架（5)的頂面（5a)及底面（5c)，將突起部（5e)嵌 合到形成在管座（1 )的內側上面（1 b )及內側底面 ® (Id)之凹部（14)，而將托架（5)可自由拆裝地安裝 在管座（1 )。在將突起部（5 e )安裝到凹部（14 )或是 取下時，能利用構成管座（1 )之內側上面（1 b )和內側 底面（1 d )本身的彈性變形。相反地也可以將形成在管座 (1 )的內側上面（1 b )和內側底面（1 d )之突起部自由 拆裝地嵌合到形成在托架（5 )的凹部。另外，形成在托 架（5 )之缺口部若是取代貫穿孔改而形成往內側側面 (5b )側張開之切槽部，則能在將冷陰極螢光放電管 (2 )安裝到管座（1 )的連接器盒（7 )之後，從開口面 -12- (10) 1280598 (le)將托架（5)插入來裝配到冷陰極螢光放電管 (2) 〇 另外’第6圖所示的實施形態，也可以是一種在管座 (1 )的內側安裝具有與此不同體且是半橢圓剖面、拋物 線剖面等的反射面之反射板（6 )之形態。反射板（6 )爲 將從冷陰極螢光放電管（2)所照射的光反射到管座（1) 的外部’托架（5 )則與構成管座（1 )的一部分之反射板 ^ ( 6 )相接。另外，也可以如第7圖所示，將冷陰極螢光 放電管（2 )嵌合到將矽橡膠等的流動體成形所形成之托 架（5 )的切槽部（15 )。此時，托架（5 )接觸到構成冷 陰極螢光放電管（2)的玻璃管（2a)之長軸方向的幾乎 全體。因此，構成冷陰極螢光放電管（2)的玻璃管 (2a)，其幾乎全體透過托架（5)連接到管座（1)。 再則’如第8圖所示，配置在各托架（5 )之間的間 隔物（1 6 )與托架（5 ) 一體形成，而能夠一體操作複數 m 個托架（5 )，且能夠利用間隔物（1 6 )來將托架（5 )保 持在管座（1 )內的預定位置。 另外的方法則是也能在沒有導光板（1 〇 )的下照型背 光源系統中使用本發明的放電管裝置。其他的實施形態還 有能夠適度選擇構成冷陰極螢光放電管（2)的玻璃管 (2a)以及材質。爲了防止構成冷陰極螢光放電管（2) 之玻璃管（2a ) —部分的局部冷卻，如第7圖，除了在將 矽橡膠等的流動體加以成形而形成之托架（5)嵌入冷陰 極螢光放電管（2 )的情況以外，設有至少3個托架（5 ) -13- (11) 1280598 且將相鄰之托架（5 )的間隔設定爲80 mm以下，期待是 設定爲5 0 mm以下較爲理想。再則，也可以利用銅、鋁、 鎂或是鋅等具優越導電性之金屬，形成1 mm厚度程度的 托架（5 )。此情況，最好是對托架（5 )的表面施予光反 射性良好的鍍鉻等，且托架（5 )設成光反射面。 〔產業上利用的可能性〕 本發明可良好地用於例如液晶顯示器中所應用之背光 源等的光源。 【圖式簡單說明】 第1圖爲本發明的放電管裝置之立體圖。 第2圖爲用於第1圖中的放電管裝置的托架之立體 圖。 第3圖爲第1圖中的放電管裝置之剖面圖。 第4圖爲應用第1圖中的放電管裝置的托架（5)之 立體圖。 第5圖爲表示本發明之反射板的實施形態之剖面圖。 第6圖爲表示設有反射板的其他實施形態之剖面圖。 第7圖爲表示應用流動體的托架的其他實施形態之剖 面圖。 第8圖爲表示一體形成間隔物之託架的其他實施形態 之剖面圖。 -14 - (12) 1280598 【主要元件符號說明 1 :管座 2 :放電管 2a :玻璃管 3 :端部 4 :中間部 5 :托架 le :開口面 1 2 :外部散熱板1280598 (1) EMBODIMENT OF THE INVENTION [Technical Field] The present invention relates to a cold cathode fluorescent discharge tube device, and more particularly to a high brightness which can be efficiently discharged by a cold cathode fluorescent discharge tube and Long-life cold cathode fluorescent discharge tube device. [Prior Art] For example, a cold cathode fluorescent discharge tube is disposed at a side end portion of a flat-shaped light guide body, and light guided from the discharge tube is reflected by a reflective sheet formed on a lower surface of the light guide body. A backlight that is emitted from the upper surface of a light body is known in the following Japanese Patent Publication 1. The backlight is provided with a reflector that surrounds the discharge tube, and the first gap formed between the discharge tube and the side end portion of the light guide body and the second gap formed between the discharge tube and the curved surface of the reflector are almost equal . Further, the sum of the first gap and the second gap is larger than the diameter of the discharge tube, and the light irradiated from the discharge tube is reflected by the reflector to be transmitted to the light guide body with good reflection. A backlight having a reflector is also described in other publications mentioned below. Japanese Patent Laid-Open Publication No. 2 is a surface light source device that prevents the entire amount of incident light from being reduced in the vicinity of the electrode portion and that covers the entire emission end surface and uniformly distributes the brightness, while the total amount of light incident on the light guide body is not reduced. The surface light source device includes a linear light source including a discharge tube, a light guide body that arranges the incident end portion in proximity to the linear light source, a diffusion member that is disposed on the light guide surface of the light guide, and a light guide body. a reflecting member on the opposite side of the emitting surface and a lamp holder covering the linear light source, and the inner surface of the socket is a diffused anti-4-(2)1280598 emitting surface at the center portion thereof, and the end surface is incident on the following welding The part will have a direct light guide, and it can achieve a backlight [曰[曰[曰, the part is set to be a regular reflection, and can increase the incidence efficiency when the light guide is incident. The patent document 3 is a backlight in which a feedback wire is provided to a light source reflector to strengthen the welded portion. In the following Japanese Patent Publication No. 4, the light guide plates of one of the cross-sections of the corner triangles are combined, and the light introduced from the end faces almost increases the utilization efficiency of the light toward the irradiation direction, and can utilize the guide of the two sheets. A flat-panel color light-emitting device that is thinned by light panels. [Patent Document 1] Patent Document 2] Patent Document 3] Patent Document 4] Japanese Laid-Open Patent Publication No. Hei No. Hei. No. Hei. No. Hei. In the case of the invention, for example, a cold cathode fluorescent discharge tube used for a television monitor or the like has a high requirement for high luminance. In order to increase the brightness of the discharge tube, it is considered to increase the tube current (lamp current) per one discharge tube or increase the number of tubes of the discharge tube disposed on the side end surface of the light guide body. However, since the cold cathode fluorescent discharge tube has a characteristic that when the temperature of the tube wall of the glass tube exceeds a certain temperature, the brightness of the discharge tube is lowered, even if the tube current or the number of tubes of the discharge tube is increased, the glass is increased. The tube wall temperature of the tube does not reach high brightness. Therefore, it is necessary to suppress the rise in the wall temperature of the glass tube and to illuminate at the most appropriate temperature to increase the brightness of the cold cathode fluorescent discharge tube. -5- (3) 1280598 Therefore, an object of the present invention is to provide a method of suppressing an increase in the wall temperature of a glass tube by increasing the number of tubes of the discharge tube or increasing the tube current to achieve high brightness and long life. Cathode fluorescent discharge tube device. <Means for Solving the Problem> The cold cathode fluorescent discharge tube device of the present invention comprises: a stem (1), and a cold cathode fluorescent discharge tube (2) having a glass tube (2a), a cold cathode Both ends (3) of the fluorescent discharge tube (2) are supported by a stem (1). The glass tube (2a) of the cold cathode fluorescent discharge tube (2) is equipped with a plurality of thermally conductive brackets (5), and a plurality of brackets (5) are electrically contacted to the stem (1). The heat generated from the cold cathode fluorescent discharge tube (2) is transmitted to the outside through the bracket (5) and the socket (1) which can be thermally connected to the bracket (5), so that cold cathode fluorescent light can be suppressed. The temperature of the discharge tube (2) rises. In addition, the glass tube (2a) is energized for a long time in a state where a cooling portion is locally generated by heat dissipation, and mercury is concentrated in the cooling mw portion, and other enthalpy causes mercury to be depleted, and there is a disadvantage that the brightness is lowered, but due to the constitution The plurality of glass tubes (2a) of the cold cathode fluorescent discharge tube (2) are in contact with the bracket (5), and since the entire length of at least the light-emitting area of the glass tube (2a) is uniformly dissipated, the brightness is not locally lowered. The glass tube (2 a ) of the cold cathode fluorescent discharge tube (2) which is reliably supported by the bracket (5) is not moved or deformed. Further, the bracket (5) can be used to prevent deformation of the stem caused by the application of an external force. > In the embodiment of the present invention, the thermally conductive bracket (5) is brought into contact with the full -6 - (4) 1280598 body in the longitudinal direction of the glass tube (2a) of the cold cathode fluorescent discharge tube (2). And the bracket (5) can be thermally contacted to the socket (1). [Effect of the Invention] The present invention has the following effects: [1] The heat dissipation bracket prevents the temperature of the wall of the cold cathode fluorescent discharge tube from rising, and the temperature of the tube wall of the discharge tube can be optimally maintained. temperature. B [2] Therefore, even if the number of tubes of the cold cathode fluorescent discharge tube is increased or the tube current is increased, the cold cathode fluorescent discharge tube can be efficiently radiated, and high luminance can be achieved. [3] Since the cold cathode fluorescent discharge tube can be uniformly cooled by cooling in the longitudinal direction, mercury can be maintained in a state where the entire light-emitting region of the discharge tube is uniformly diffused, and uniform brightness can be achieved. [4] Even if the lamp is energized for a long time, the state in which the mercury is partially depleted does not occur, the life of the lamp becomes long, and the brightness is not lowered during the lamp life guarantee period, and the highly reliable cold cathode fluorescent discharge tube can be realized. Device. [Embodiment] Hereinafter, an embodiment of a cold cathode fluorescent discharge tube device of the present invention to which a backlight system is applied will be described with reference to Figs. 1 to 8 . As shown in Fig. 1, the cold cathode fluorescent discharge tube device of the present invention comprises: a stem (1), a connector case (7) provided at both ends of the stem (1), and a glass tube ( 2a) Cold cathode fluorescent discharge tube (2). Both ends (3) of the cold cathode fluorescent discharge tube (2) are supported by a connector case -7-(5) 1280598 (7). The glass tube (2a) is formed into a straight cylindrical shape having an inner diameter of 2 mm and a total length of 310 mm, and is sealed with a rare gas and a mercury vapor inside the inner casing, and is provided to face the both ends of the glass tube (2a). One pair of electrodes (not shown), a fluorescent film formed on the inner wall of the glass tube (2a), and one of the two ends of the cold cathode fluorescent discharge tube (2) are electrically connected to the electrode and electrically connected to the electrode. Right terminal. The pair of terminals are connected to the wire (8) in the connector box (7), and connected to the inverter tube lighting circuit (not shown) through the wire (8), so the discharge tube lighting is generated by the frequency conversion circuit. The high voltage is applied to a pair of terminals of each cold cathode fluorescent discharge tube (2). The inner wall surface (la) of the stem (1) composed of the upper surface (1 b ), the side surface (1 c ), and the (bottom surface) constitutes a part of the light to be irradiated from the cold cathode fluorescent discharge tube (2) Reflected light reflecting surface. The stem (1) is formed of a metal material having a high thermal conductivity and a good heat dissipation property or an alloy of these metal materials. Metal: Thermal conductivity (kcal/m·h· °C) Copper (Cu): 332 Aluminum (A1): 196 Magnesium (Mg): 147 Zinc (Zn): 96 As shown in Figure 1, cold cathode fluorescent discharge The tube (2) is supported by six brackets (5) arranged in the stem (1). It is preferable that the bracket (5) having both excellent thermal conductivity and good light transmittance is formed of, for example, a rectangular plate made of enamel resin having a thickness of about 3 mm. As shown in Fig. 2, each bracket (5) is provided with a through hole -8 - (6) 1280598 (15) for fitting a notch portion of a pair of discharge tubes (2), and a pair of through holes (15) are almost The cross-sectional shape of the glass tube (2a) constituting the cold cathode fluorescent discharge tube (2) is equal. The inner diameter of the through hole (15) of the circular cross section is substantially equal to the outer diameter of the glass tube (2a) constituting the cold cathode fluorescent discharge tube (2), for example, formed by a diameter of about 2 mm, When the cold cathode fluorescent discharge tube (2) is fitted into the through hole (15) of the bracket (5), it extends in the middle portion between the both end portions (3) of the cold cathode fluorescent discharge tube (2) ( 4), that is, the outer wall of the light-emitting region of the glass tube (2a) contacts the inner wall of the through-hole (15). In this way, the cold cathode fluorescent discharge tube (2) is surely held at a predetermined position in the stem (1), and the heat of the glass tube (2a) can be transmitted to the bracket (5). As shown in Fig. 1, the brackets (5) are assembled at almost equal intervals between the one end and the other end in the socket (1), covering almost the entire length to support the cold that has been inserted into the through hole (15). The intermediate portion (4) of the cathode fluorescent discharge tube (2). The top surface (5a), the inner side surface (5b) and the bottom surface (5c) of the bracket (5) respectively contact the upper surface (1 b ), the side surface (1 c ) and the bottom surface (1 d ) of the socket (1) The bracket (5) is in close contact with the stem (1). The outer side surface (5d) of the bracket (5) exposes the opening surface (1 e ) of the stem (1). In this embodiment, the opening surface (1 e ) between the pair of connector boxes (7 ) is formed. The gap length (the opposing interval of the pair of connector boxes (7)) L is set to 29 8 mm, and the thickness of the bracket (5) is set to 3 mm. The interval between the brackets (5) disposed between the pair of connector boxes (7) at equal intervals and the brackets (5) disposed at both ends are spaced apart from the connector box (7) by about 4 Mm 〇-9- (7) 1280598 A backlight that is used as a light source such as a liquid crystal display, as shown in Fig. 4, is provided with a plate-shaped light guide body made of a translucent resin material or the like (10). And the cold cathode fluorescent discharge tube device disposed at both ends of the light guide body (10). A pair of cold cathode fluorescent discharge tube devices are respectively disposed at one end portion (1〇〇 and the other end portion (10〇d) of the light guide body (10), and each of the cold cathode fluorescent discharge tube devices The socket (1) extends along one of the end faces (10c) of the light guide body (10) and the other end face® (10d), and the outer side of the connector case (7) and the six brackets (5) (5d), respectively, abutting against one end surface (10a) of the light guide body (10) and the other end surface (10d). Therefore, the cold cathode fluorescent discharge tube (2) utilizes a light guide body ( 10) is surrounded by the end faces (l〇c, l〇d) and the bracket (5). The light guide body (10) is preferably formed of various resin materials excellent in light transmittance and heat resistance, for example, It is formed of an acrylic resin. A reflective film (not shown) is adhered to the other main surface (l〇e) of the light guide body (10). Further, as shown in Fig. 4, it is disposed in the light guide body ( 10) Both ends of the external heat sink (12) on the main surface (l〇e) side of the other side are connected to the bottom surface (1 d) of the stem (1), so the cold cathode fluorescent discharge tube (2) passes through the plural Brackets (5) The heat conduction is connected to the stem (1) and the external heat sink (12). The external heat sink (12) is formed of a metal material having good thermal conductivity such as zinc (Zn), aluminum (A1) or copper (Cu). The function of guiding the heat of the cold cathode fluorescent discharge tube (2) conveyed by the bracket (5) and the stem (1) to the outside. The inner wall (la) of the stem (1) constitutes a white paint or -10- (8) 1280598 chrome plating to reflect the light irradiated by the cold cathode fluorescent discharge tube (2). However, when the stem (1) itself is formed of a material having a high light reflectance, It is not necessary to apply white paint or chrome plating to the inner wall (la). Since the inner wall (la) of the stem (1) is a light reflecting surface, the stem (1) is configured to guide light to the light guide. The reflector of the body (10). However, the light guided by the light guide body (10) from the light radiated from the cold cathode fluorescent discharge tube (2) is directly incident from the end surface (10c, 10d) to the guide. ® Light body (1 〇), the light that is radiated from the cold cathode fluorescent discharge tube (2) and radiated to the side of the stem (1) is inside the stem (1) (1 a ) After the reflection, the light guide body (10) is incident from the end surface (10c, 10d). The light incident on the light guide body (10) is reflected by the inner side of the light guide body (10). The main surface (10) of one of the light guides (10) emits light in a planar manner. The cold cathode fluorescent discharge tube device of the present embodiment has the following effects: β [1] The heat generated from the discharge tube (2) is led to the outside through the bracket (5) and the stem (1) which is thermally connected to the bracket (5), so that the temperature rise of the discharge tube (2) can be suppressed. [2] The heat generated from the discharge tube (2) can also be well exported to the outside through the external heat sink (1 2 ) connected to the stem (1). [3] The cold cathode fluorescent discharge tube (2) can be almost uniformly thermally conducted by covering the plurality of brackets (5) of the cold cathode fluorescent discharge tube (2) at equal intervals. [4] Since the light-transmitting bracket (5) is provided, the dark -11 - (9) 1280598 portion of the shadow or the like is not formed in the peripheral portion of the bracket (5). [5] By increasing or decreasing the number of brackets (5) contacting the plurality of cold cathode fluorescent discharge tubes (2), it is easy to adjust the heat dissipation amount of the cold cathode fluorescent discharge tube (2) in accordance with the tube current. [6] Since the intermediate portion (4) of the cold cathode fluorescent discharge tube (2) is reliably supported by a plurality of brackets (5), the cold cathode fluorescent discharge tube (2) is not easily moved or deformed, and A high-reliability cold cathode fluorescent #光光管装置 is realized. [7] When an external force or heat is applied to the stem (1), the deformation of the stem (1) can be well prevented by the plurality of brackets (5) disposed in the stem (1). The embodiment of the present invention can be variously modified. For example, as shown in Fig. 5, the protrusion (5e) and the bracket (5) may be integrally formed on the top surface (5a) and the bottom surface (5c) of the bracket (5), and the protrusion (5e) Fitted into a recess (14) formed on the inner upper surface (1 b ) and the inner bottom surface ® (Id) of the stem (1), and the bracket (5) is detachably mounted on the stem (1) . When the projection (5 e ) is attached to the recess (14) or is removed, the elastic deformation of the inner upper surface (1 b ) and the inner bottom surface (1 d ) of the stem (1) can be utilized. Conversely, the projection formed on the inner upper surface (1b) and the inner bottom surface (1d) of the stem (1) can be detachably fitted to the recess formed in the bracket (5). Further, if the notch portion formed in the bracket (5) is formed as a notch portion that is opened toward the inner side surface (5b) instead of the through hole, the cold cathode fluorescent discharge tube (2) can be attached to the stem (1). After the connector box (7), insert the bracket (5) from the opening surface -12-(10) 1280598 (le) to assemble the cold cathode fluorescent discharge tube (2) 〇 additionally 'Figure 6 In the embodiment, a reflection plate (6) having a reflection surface having a semi-elliptical cross section, a parabolic cross section or the like may be attached to the inside of the stem (1). The reflecting plate (6) is a reflecting plate for reflecting the light irradiated from the cold cathode fluorescent discharge tube (2) to the outer portion of the stem (1) and the reflecting plate constituting a part of the stem (1). (6) meet. Further, as shown in Fig. 7, the cold cathode fluorescent discharge tube (2) may be fitted to a notch portion (15) of the holder (5) formed by molding a fluid such as ruthenium rubber. At this time, the bracket (5) is in contact with almost the entire length of the glass tube (2a) constituting the cold cathode fluorescent discharge tube (2). Therefore, the glass tube (2a) constituting the cold cathode fluorescent discharge tube (2) is almost entirely connected to the stem (1) through the bracket (5). Further, as shown in Fig. 8, the spacer (16) disposed between the brackets (5) is integrally formed with the bracket (5), and the plurality of brackets (5) can be integrally operated, and The spacer (16) can be utilized to hold the bracket (5) at a predetermined position within the stem (1). Alternatively, the discharge tube device of the present invention can be used in a downlight type backlight system without a light guide plate (1 〇 ). In other embodiments, the glass tube (2a) and the material constituting the cold cathode fluorescent discharge tube (2) can be appropriately selected. In order to prevent partial cooling of the glass tube (2a) constituting the cold cathode fluorescent discharge tube (2), as shown in Fig. 7, the bracket (5) formed by molding a fluid such as ruthenium rubber is embedded in the cold. In addition to the case of the cathode fluorescent discharge tube (2), at least three brackets (5) -13-(11) 1280598 are provided, and the interval between adjacent brackets (5) is set to 80 mm or less. It is preferably 50 mm or less. Further, it is also possible to form a bracket (5) having a thickness of 1 mm by using a metal having excellent conductivity such as copper, aluminum, magnesium or zinc. In this case, it is preferable to apply chrome plating or the like having good light reflectivity to the surface of the bracket (5), and the bracket (5) is provided as a light reflecting surface. [Possibility of Industrial Applicability] The present invention can be suitably applied to a light source such as a backlight used in a liquid crystal display. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a discharge tube device of the present invention. Fig. 2 is a perspective view of a bracket used in the discharge tube device of Fig. 1. Fig. 3 is a cross-sectional view showing the discharge tube device of Fig. 1. Fig. 4 is a perspective view showing a bracket (5) to which the discharge tube device of Fig. 1 is applied. Fig. 5 is a cross-sectional view showing an embodiment of a reflector of the present invention. Fig. 6 is a cross-sectional view showing another embodiment in which a reflector is provided. Fig. 7 is a cross-sectional view showing another embodiment of a bracket to which a fluid is applied. Fig. 8 is a cross-sectional view showing another embodiment of a bracket in which spacers are integrally formed. -14 - (12) 1280598 [Description of main component symbols 1 : Tube holder 2 : Discharge tube 2a : Glass tube 3 : End part 4 : Intermediate part 5 : Bracket le : Opening surface 1 2 : External heat sink