201118914 九、發明說明： 【發明所屬之技術領域3 本發明係有關於一種放電燈用電極插銷及其製造方 法、電極構造體、冷陰極螢光燈及其製造方法、照明普置 5 及液晶顯示裝置。 K：先前技術3 目前’液晶顯示裝置之背光單元之光源主要是採用冷 陰極螢光燈(CCFL)。冷陰極螢光燈之電極部分係由電^ 部、電極插銷（封接線部）及外部引線所構建成者（參考諸如 1〇專利文獻1)。近年來，因應液晶電視機之晝面的大型化、 薄型化、高亮度化及節省功率化之需求，冷陰極營光燈趙 於更長(要求長度時_〇〇mm以上）、更細（要求細時外二為 2mm)、更明亮，又具更高的效率者。 [專利文獻1 ]日本發明專利公開公報第2004_234891號 15 冷陰極螢光燈之電㈣分之電極插銷（封人棒)係由鎢 棒構成者。鎢之融點高，因此不能以鍛造等方法成形，而 是採用使粉末成形後燒結之方法，即粉末冶金法製造者。 該燒結體係藉型鍛加工及拉延加工等處理，成形為棒狀， 但在加工時容易產生長向的裂痕或凸紋。 20 #此長向之祕或凸紋存在於電__，不能完全 2玻璃密封連接，因此大氣透過其等缺陷而流人放電燈之 管内’成為產品不良原因之一。通常，具有如此缺陷之電 極插銷原本可藉檢查排除的。 惟，就算藉其檢查，彳將不良率降低到數,等級之錯 201118914 誤但疋冷陰極螢光燈是以數根到十數根來使用在背光單 元，使得作為背光單元之不良率之錯誤值變大。又，近年 來，液晶顯示裝置不只是使用|PC監視器，還使用在數量 很多之電視機，因此需要可耐用數萬時間之長期使用之高 5 度可靠性。 此外，冷陰極螢光燈又需要以低成本製造，但實際上 目前處於不使用複雜構造或昂責的構件的話就無法滿足長 哥命且鬲可靠性之狀況。本發明人係有鑑於如此狀況，乃 精^研九後，結果發現以簡潔的結構，即可實現長壽命且 10高可靠性之構造，終完成本發明。 本發明乃為了解決上述問題而所創建成者，主要目的 係於提供可靠性優異之放電燈用電極插銷及其製造方法、 電極構造體、冷陰極螢光燈及其製造方法、照明裝置及液 晶顯不裝置。 15 【發明内容】 為達成上述目的，本發明乃採用下述各項構造。 [放電燈用電極插銷] 本發明之放電燈用電極插銷係密封連接於玻璃管之端 部之放電燈用電極插銷。又，本發明之放電燈用電極插銷 2〇包含有·電極插銷本體、及溝槽，係形成於前述電極插銷 本體之表面中在密封連接於前述玻璃管之端部之封接處上 跨越沿前述電極插銷本體長向之線者。在此，以溝槽之具 體例而言，可採用實質地繞著電極插銷本體之軸周圍一圈 之狀態之構造。 201118914 在上述本發明之放電燈用電極插銷中，前述溝槽以 採用電極軸本體之表面上形成為螺錄之構造。 又，在上述本發明之放電燈用電極插銷中前述螺徒 狀溝槽係可採用前述電極插銷本體之表面上形成2圈以上 5 之構造。 又’上述本發明之放電燈用電極插銷中，前述溝横德 可採用電極插銷本體之表面上形成—端與另一端連結之環 狀構造。 又，上述本發明之放電燈用電極插銷中，前述環狀溝 H)槽係可採用電極插銷本體之表面上形成2條以上之構造。 又，上述本發明之放電燈用電極插銷中，前述溝槽係 可採用具有由前述電極插銷本體之表面凹陷之凹部及速接 於前述凹部且由前述電極插銷本體之表面&起之凸部之構 造。 15 又，上述本發明之放電燈用電極插銷中，可採用藉塑 鍛加工或拉延加工延伸製造之構造。 又，上述本發明之放電燈用電極插銷中，可採用由鎢 (W)或鉬（Mo)構成之構造。 又，上述本發明之放電燈用電極插銷中，可採用鐵(Fe) 2〇及鎳(Ni)之合金構成之構造。 又’上述本發明之放電燈用電極插銷中，前述溝槽係 可採用藉雷射加工形成之構造。 又，上述本發明之放電燈用電極插銷中，可採用前述 電極插銷本體之-端部連接有引線之構造。 201118914 又，上述本發明之放電燈用電極插銷中，前述引線係 可採用由鎳構成之構造。 [電極構造體] 本發明之電極構造體可採用具有上述本發明之放電燈 5用電極插銷，電極插銷本體之一端部連接有引線，另〆端 部連接有杯形電極之構造。 又’在上述本發明之電極構造體中’可採用在則述電 極插銷本體之表面密封連接有玻璃珠之構造。 [冷陰極螢光燈] 1〇 本發明之冷陰極螢光燈包含有：玻璃管、形成於則述 破璃管内面之螢光體層、及上述本發明之放電燈用電極插 銷為特徵所在。 又，在上述本發明之冷陰極螢光燈中，玎採用玻璃賞 由硼矽酸玻璃構成之構造。 15 [照明裝置] 本發明之照明裝置係具有上述本發明之冷陰極螢光燈 者為特徵所在。 [液晶顯示裝置] 本發明之液晶顯示裝置係具有上述本發明之照明裝置 2〇者為特徵所在。 [放電燈用電極插銷之製造方法] 本發明之放電燈用電極插銷之製造方法係—種放電燈 用電極插銷之製造方法，包含有：步驟(a)， 丘 ^, 尔+備電極插 蜎本體；及步驟(b)，係於前述電極插銷本體之表面升成= 201118914 越該電極插銷本體長向之線之溝槽。在此，在本發明之放 電燈用電極插銷之製造方法中，以凹部之具體例而言，可 採用實質地繞著電極插銷本體之軸周圍一圈之狀態的溝 槽。 5 在上述本發明之放電燈用電極插銷之製造方法中，前 述步驟(b)可採用藉雷射加工執行之構造。 又，在上述本發明之放電燈用電極插銷之製造方法 中，可採用下述構造，即，使前述電極插銷本體以其長向 之中心軸為轉軸一邊旋轉，一邊將前述溝槽形成螺旋狀。 10 又，上述本發明之放電燈用電極插銷之製造方法中， 可採用下述構造，即，使前述電極插銷本體以其長向之中 心軸為轉軸一邊旋轉，一邊將前述溝槽形成一端與另一端 連結之環狀。 又，上述本發明之放電燈用電極插銷之製造方法中， 15 可採用下述構造，即，前述步驟(a)包含有一藉型鍛加工或 拉延加工延伸拉伸構成電極插銷本體之金屬材料之子步 驟。 又，上述本發明之放電燈用電極插銷之製造方法中， 可採用下述構造，即，構成前述電極插銷本體之材料為鎢 20 或鉬。 [冷陰極螢光燈之製造方法] 在本發明之冷陰極螢光燈之製造方法中，包含有：準 備電極插銷本體之步驟(a);在電極插銷本體之表面上形成 跨越沿該電極插銷本體長向之線之溝槽之步驟(b);將引線 201118914 連接於前述電極插銷本體之一端部之步驟：將杯形電極連 接於前述電極插銷本體之另一端部之步驟；及，在前述電 極插銷本體中形成有前述溝槽之區域熔接玻璃構件之步 驟。 / 5 [發明之效果] 依本發明之放電燈用電極插銷，在於電極插銷本體之 表面_密封連接於玻璃管端部之封接處形成有跨越沿電極 插銷本體長向之線之溝槽，因此可提昇封接部之強度，結 果可提供-種可靠性優異之放電燈（冷陰極螢光燈）。 10 又，依本發明之電極構造體，採用上述本發明之放電 燈用電極插銷，因此同樣可得到上述效果。 依本發明之冷陰極螢光燈，採用上述本發明之放電燈 用電極插銷，因此同樣可得到上述效果。 又，依本發明之照明裝置，採用上述本發明之冷陰極 15螢光燈，因此同樣可得到上述效果。 又，依本發明之液晶顯示裝置，採用上述本發明之照 明裝置作為背光單元’因此可確保高度的顯示品質。 依本發明之放電燈電極插銷之製造方法，可在不須增 加構件之狀態下’製造可得到上述效果之本發明的放電燈 20用電極插銷。 又，在本發明之冷陰極螢光燈之製造方法中，可使用 ㈣與上述本發明之玫電㈣電極減之f造方法同-製 程所氡之放電燈用電極插銷，來製造冷陰極勞光燈，因 此不須透過增加構件等方式，即可製造得到上述效果之本 201118914 發明之冷陰極螢光燈。 [圖式簡單說明] 第1圖係模示地顯示本發明第1實施型態之冷陰極螢光 燈100之剖視圖。 5 第2圖係冷陰極螢光燈100之插通部分（封接部）17之放 大圖。 第3圖係模式地顯示電極插銷22之構造圖。 第4圖係溝槽30周邊之剖視圖。 第5圖係溝槽30周邊之剖視圖。 1〇 第6圖係模式地顯示電極插銷22之構造立體圖。 第7圖係模式地顯示電極插銷22之構造立體圖。 第8圖係模式地顯示電極插銷22之構造立體圖。 第9圖係模式地顯示電極插銷22之構造立體圖。 第10圖係模式地顯示電極插銷22之構造立體圖。 15 第11圖係圖式代用照片，顯示實驗樣本之構造。 第12圖係用以說明實驗樣本之構造之剖視圖。 第13圖係圖式代用照片，顯示強度實驗之結果。 第14圖係圖式代用照片，顯示強度實驗之結果。 第15(a)至15(d)圖係製程剖視圖，說明第1實施蜇邊之 2〇 冷陰極螢光燈100之製造方法。 第16(a)至16(c)圖係製程剖視圖，說明第1實施裂態& 冷陰極螢光燈100之製造方法。 第17(a)至17(c)圖係製程到視圖，說明第1實施蜇態之 冷陰極螢光燈100之製造方法。 201118914 第18圖係顯示第2實施型態之照明裝置400之構造之分 解立體圖。 第19圖係顯示第3實施型態之照明裝置則之構造之立 體圖（局部省略剖視圖）。 5 ㈣圖係顯示第4實施型態之液晶顯示裝置700之構造 之立體圖（局部省略剖視圖）。201118914 IX. Description of the Invention: [Technical Field 3 of the Invention] The present invention relates to an electrode plug for a discharge lamp, a method of manufacturing the same, an electrode structure, a cold cathode fluorescent lamp, a method of manufacturing the same, an illumination device 5, and a liquid crystal display Device. K: Prior Art 3 The light source of the backlight unit of the present liquid crystal display device is mainly a cold cathode fluorescent lamp (CCFL). The electrode portion of the cold cathode fluorescent lamp is constructed by an electric portion, an electrode plug (a sealing portion), and an external lead (refer to, for example, Patent Document 1). In recent years, in response to the demand for large-scale, thin, high-brightness, and power-saving of LCD TVs, cold cathode camplights are longer (more than _〇〇mm in length) and finer ( It is required to be 2mm), brighter and more efficient. [Patent Document 1] Japanese Laid-Open Patent Publication No. 2004_234891 15 The electric (four) electrode plug (sealing rod) of the cold cathode fluorescent lamp is composed of a tungsten rod. Since the melting point of tungsten is high, it cannot be formed by a method such as forging, but a method of sintering the powder after molding, that is, a powder metallurgy manufacturer. The sintering system is formed into a rod shape by a forging process and a drawing process, but is prone to long cracks or ridges during processing. 20 #The secret of the long direction or the embossing exists in the electricity __, which cannot be completely sealed by the glass. Therefore, the atmosphere flows into the tube of the discharge lamp through its defects, which becomes one of the causes of product defects. Usually, the electrode plugs with such defects can be excluded by inspection. However, even if it is checked, the defect rate is reduced to the number, the error of the grade 201118914 is wrong, but the cold cathode fluorescent lamp is used in the backlight unit from several to ten, making the error rate as the backlight unit wrong. The value becomes larger. Moreover, in recent years, liquid crystal display devices have not only been used with |PC monitors, but also used in a large number of television sets, and therefore require a high degree of reliability that can last for tens of thousands of hours of long-term use. In addition, the cold cathode fluorescent lamp needs to be manufactured at a low cost, but in reality, it is not possible to satisfy the longevity and reliability of the component without using a complicated structure or a conscientious component. The inventors of the present invention have in view of such a situation, and have found that a structure having a long life and a high reliability can be realized with a simple structure, and the present invention has been completed. The present invention has been made to solve the above problems, and the main object thereof is to provide an electrode plug for a discharge lamp having excellent reliability, a method of manufacturing the same, an electrode structure, a cold cathode fluorescent lamp, a method of manufacturing the same, an illumination device, and a liquid crystal No device. 15 SUMMARY OF THE INVENTION In order to achieve the above object, the present invention adopts the following configurations. [Electrode plug for discharge lamp] The electrode plug for a discharge lamp of the present invention is an electrode plug for a discharge lamp that is connected to the end of a glass tube. Further, the electrode plug 2A for a discharge lamp according to the present invention includes an electrode plug body and a groove formed on a surface of the electrode plug body at a sealing portion sealed to an end portion of the glass tube The electrode plug body is long in the line. Here, in the case of the groove, a configuration in which the circumference of the shaft of the electrode pin body is substantially one turn can be employed. In the above-described electrode plug for a discharge lamp of the present invention, the groove is formed to have a structure in which a surface of the electrode shaft body is formed. Further, in the electrode plug for a discharge lamp of the present invention, the screw-shaped groove may have a structure in which two or more turns are formed on the surface of the electrode plug body. Further, in the electrode plug for a discharge lamp of the present invention, the groove may be formed in a ring-like structure in which the end of the electrode pin body is formed to be connected to the other end. Further, in the electrode plug for a discharge lamp of the present invention, the annular groove H) may have a structure in which two or more electrodes are formed on the surface of the electrode plug body. Further, in the electrode plug for a discharge lamp according to the present invention, the groove may be a concave portion having a surface recessed from the surface of the electrode plug main body, and a convex portion which is fastened to the concave portion and which is formed by the surface & Construction. Further, in the electrode plug for a discharge lamp of the present invention, a structure which is manufactured by plastic forging or drawing can be used. Further, in the electrode plug for a discharge lamp of the present invention, a structure made of tungsten (W) or molybdenum (Mo) may be employed. Further, in the electrode plug for a discharge lamp of the present invention, a structure of an alloy of iron (Fe) 2 〇 and nickel (Ni) may be employed. Further, in the electrode plug for a discharge lamp of the present invention, the groove may be formed by laser processing. Further, in the electrode plug for a discharge lamp of the present invention, a structure in which a lead wire is connected to an end portion of the electrode plug body can be employed. Further, in the electrode plug for a discharge lamp of the present invention, the lead wire may have a structure made of nickel. [Electrode structure] The electrode structure of the present invention can employ the electrode plug of the discharge lamp 5 of the present invention described above, and one end of the electrode plug body is connected with a lead wire, and the other end portion is connected to the cup electrode. Further, in the above-described electrode structure of the present invention, a structure in which glass beads are sealed and connected to the surface of the electrode plug body can be employed. [Cold Cathode Fluorescent Lamp] The cold cathode fluorescent lamp of the present invention comprises a glass tube, a phosphor layer formed on the inner surface of the glass tube, and the electrode plug for the discharge lamp of the present invention. Further, in the above-described cold cathode fluorescent lamp of the present invention, the structure of the glass is made of borosilicate glass. 15 [Lighting device] The lighting device of the present invention is characterized by having the above-described cold cathode fluorescent lamp of the present invention. [Liquid Crystal Display Device] The liquid crystal display device of the present invention is characterized by having the above-described illumination device of the present invention. [Manufacturing Method of Electrode Plunger for Discharge Lamp] The method for manufacturing an electrode plug for a discharge lamp of the present invention is a method for producing an electrode plug for a discharge lamp, comprising: step (a), methane, electrode, and electrode insertion And the step (b) is formed on the surface of the electrode plug body to form a groove that is longer than the length of the electrode plug body. Here, in the method of manufacturing the electrode plug for a discharge lamp of the present invention, as a specific example of the concave portion, a groove substantially in a state of being wound around the axis of the electrode pin main body may be employed. In the above method of manufacturing an electrode plug for a discharge lamp of the present invention, the above step (b) may be carried out by a laser processing. Further, in the method of manufacturing an electrode plug for a discharge lamp according to the present invention, the electrode plug body may be spirally formed while rotating the center axis of the longitudinal direction of the electrode pin body. . Further, in the method of manufacturing an electrode plug for a discharge lamp according to the present invention, the electrode plug body may be formed such that one end of the groove is formed while rotating the center pin of the longitudinal direction of the electrode pin as a rotation axis. The other end is connected to the ring. Further, in the above method for manufacturing an electrode plug for a discharge lamp according to the present invention, 15 may have a configuration in which the step (a) includes a die-casting or drawing process to stretch and stretch the metal material constituting the electrode plug body. Substeps. Further, in the method of manufacturing an electrode plug for a discharge lamp according to the present invention, the material constituting the electrode plug body may be tungsten 20 or molybdenum. [Manufacturing Method of Cold Cathode Fluorescent Lamp] The method for manufacturing a cold cathode fluorescent lamp according to the present invention includes: a step (a) of preparing an electrode plug body; forming a crossing pin along the surface of the electrode plug body a step (b) of the groove of the long line of the body; a step of connecting the lead 201118914 to one end of the electrode plug body: a step of connecting the cup electrode to the other end of the electrode plug body; and, in the foregoing The step of welding the glass member in the region of the groove formed in the electrode plug body. / [Effect of the Invention] The electrode plug for a discharge lamp according to the present invention is that a surface of the electrode plug body is formed with a groove extending across a longitudinal line of the electrode plug body at a sealing portion sealed to an end portion of the glass tube. Therefore, the strength of the sealing portion can be increased, and as a result, a discharge lamp (cold cathode fluorescent lamp) excellent in reliability can be provided. Further, according to the electrode structure of the present invention, since the electrode plug for a discharge lamp of the present invention is used, the above effects can be obtained in the same manner. According to the cold cathode fluorescent lamp of the present invention, the above-described electrode plug for a discharge lamp of the present invention is used, and the above effects can be obtained in the same manner. Further, according to the illuminating device of the present invention, since the cold cathode 15 fluorescent lamp of the present invention described above is used, the above effects can be obtained in the same manner. Further, according to the liquid crystal display device of the present invention, the above-described illumination device of the present invention is employed as the backlight unit', thereby ensuring high display quality. According to the manufacturing method of the discharge lamp electrode plug of the present invention, the electrode plug for the discharge lamp 20 of the present invention which can obtain the above effects can be manufactured without adding a member. Further, in the method for producing a cold cathode fluorescent lamp of the present invention, the electrode plug for a discharge lamp of the same method as the above-described method of the invention can be used to manufacture a cold cathode electrode. Since the light lamp is used, it is possible to manufacture the cold cathode fluorescent lamp of the invention of the present invention of the present invention by the method of adding a member or the like. [Brief Description of the Drawings] Fig. 1 is a cross-sectional view showing a cold cathode fluorescent lamp 100 according to a first embodiment of the present invention. 5 Fig. 2 is an enlarged view of the insertion portion (sealing portion) 17 of the cold cathode fluorescent lamp 100. Fig. 3 is a view schematically showing the configuration of the electrode plug 22. Figure 4 is a cross-sectional view of the periphery of the trench 30. Figure 5 is a cross-sectional view of the periphery of the trench 30. 1〇 Fig. 6 is a perspective view showing the structure of the electrode plug 22 in a schematic manner. Fig. 7 is a perspective view showing the structure of the electrode plug 22 in a schematic manner. Fig. 8 is a perspective view showing the configuration of the electrode plug 22 in a schematic manner. Fig. 9 is a perspective view showing the structure of the electrode plug 22 in a schematic manner. Fig. 10 is a perspective view showing the configuration of the electrode plug 22 in a schematic manner. 15 Figure 11 is a diagram of a substitute photo showing the construction of an experimental sample. Figure 12 is a cross-sectional view showing the construction of an experimental sample. Figure 13 is a graphical representation of the results of the strength experiment. Figure 14 is a graphical representation of the results of the strength experiment. 15(a) to 15(d) are cross-sectional views showing a method of manufacturing the cold cathode fluorescent lamp 100 of the first embodiment. 16(a) to 16(c) are cross-sectional views showing a method of manufacturing the first embodiment of the cracked & cold cathode fluorescent lamp 100. 17(a) to 17(c) are diagrams showing a process to a view, and a method of manufacturing the cold cathode fluorescent lamp 100 of the first embodiment will be described. 201118914 Fig. 18 is an exploded perspective view showing the structure of the illumination device 400 of the second embodiment. Fig. 19 is a perspective view showing a structure of a lighting device of a third embodiment (a partially omitted cross-sectional view). (4) A perspective view showing a structure of a liquid crystal display device 700 of the fourth embodiment (a partially omitted cross-sectional view) is shown.
【貧施方式；J 本發明人乃為了提昇冷陰極勞光燈之電極部分之電極 插銷（封入棒)及玻璃管之端部間之密接性（即，位於玻璃珠 斤覆蓋之心的強度）’而進行了各種檢討時發現經由雷 射加工等之處理，在由鎢等所構成之放電燈用電極插銷之 周面形成溝槽時，可顯著地提昇插通部分之放電燈用電極 插銷與玻璃管之間的接合強度；根據該知見 ，終而完成本 發明。 15 [第1實施型態] 以下一邊參照附圖’ 一邊說明本發明之第1實施型態。 在下述附圖中，為簡化說明’以同一參考符號顯示實質上 具有同一功能之構成要素。又，本發明不限於下述實施型 態。 20丨·冷陰極螢光燈100、電極構造體20及放電燈用電極插銷22 一邊參考第1至3圖，〆邊說明本發明第1實施型態之冷 陰極螢光燈100、電極構造體20及放電燈用電極插銷22。第 1圖係模式地顯示本實施裘態之冷陰極螢光燈1〇〇(在下文 中簡稱為「冷陰極螢光燈100」）構造之剖視圖，第2圖係冷 12 201118914 陰極螢光燈100中以玻璃珠15密封之端部1〇a之放大圖。 又’第3圖係模式地顯示冷陰極螢光燈1〇〇所具有之放電燈 用電極插銷22(在下文中簡稱為「電極插銷22」）之構造圖。 冷陰極營光燈1GG係由玻璃管1()、形成在_管1〇之内 5面之螢光體層12及電極構造㈣構成者。玻璃㈣係由端 部l〇a用破璃珠15封閉之玻璃管所構成，在玻璃管1〇之内部 封入水銀(Hg)。螢光體層12係由諸如螢光體粉末及黏接劑 (黏合劑)所構成者。 電極構造體20係藉呈棒狀之電極插銷本體21、連接於 10電極插銷本體21之一端部之電極24、連接於電極插銷本體 21之另一端部之外部引線26之組合所構成者。此外，在冷 陰極螢光燈100中，電極24位於玻璃管1〇〇之内部，外部引 線26位於玻璃管1〇〇之外部。又，亦有對電極插銷與外部引 線併稱為放電燈用電極插銷之情況。 15 電極插銷22係藉玻璃珠15而固定於玻璃管1〇之端部 l〇a。具體而言’是以貫穿藉玻璃珠15封接之部分的狀態下 設置，在該部分相對於周面而有玻璃珠15覆蓋，而固定於 玻璃管10之端部l〇a。電極插銷22係由諸如鎢(W)或鉬（Mo) 構成者’本實施型態之冷陰極螢光燈100所具有之電極插銷 2〇 22 ’其一個例子是鎢(w)製之插銷。 電極24係由鎳(Ni)、鈮(Nb)、鉬(Mo)、鎢(W)等構成， 本實施型態之冷陰極螢光燈1〇〇之電極24，其一個例子是有 底筒狀之杯形電極，由鎳(Ni)形成者。又，外部引線26係由 諸如鎳(Ni)、鐵鎳合金(dumet)構成，本實施槊態之冷陰極 13 201118914 螢光燈100之外部引線26,其一個例子是鎳(Ni)製之金屬線。 本實施型態之電極插銷22包含有：電極插銷本體21、 及於電極插銷本體21之表面中密封連接於玻璃管1〇之端部 10a之處（封接部）17跨越沿電極插銷本體21長向35之線（與 5第3圖之長向35平行之假想線37)之溝槽30。換言之，在本 實施型態之構造中，在於電極插銷本體21之表面中藉玻璃 珠溶接之封接處形成有溝槽3〇。 更具體而言，電極插銷22，例如其周面内被玻璃珠15 覆蓋之區域(被密封連接之處（封接部；插通部分）17)上，形 10成有沿著相對於沿中心軸之方向35(沿著第3圖之假想線37 之方向）交叉之方向延伸之溝槽3〇。溝槽3〇,例如實質地環 繞電極插銷本體21之中心軸一圈之狀態下延伸之型態者亦 "irj* 〇 玻璃珠15係一用以封接玻璃管1〇之端部1〇a及用以將 15電極插銷22固定於玻璃管10之端部l〇a之玻璃構件，例如由 硼矽酸玻璃構成者。又，在本實施型態之冷陰極螢光燈1〇〇 中，玻璃管H) ’其-個例子，是由爛石夕酸玻壤構成。辦 酸玻璃是減少鹼成分之玻璃，因此可減少對螢光體層丨2不 良之影響’因此較佳。 形成在電極插銷本體21之表面之溝槽3〇，諸如為職 狀溝槽。此溝槽30係藉對於鎢(w)製之電極插銷本體21之表 面照射雷 者。 σ工所形成 射（諸如YAG雷射或C〇2雷射）之雷射力 在第1圖至第3圖所示之型態例中，係相对於電極插銷 20[Inferior application method; J The inventor has improved the adhesion between the electrode pins (encapsulated rods) of the electrode portion of the cold cathode discharge lamp and the ends of the glass tube (ie, the strength of the core of the glass beads) In the case of various processes, it has been found that when a groove is formed on the circumferential surface of the electrode plug for a discharge lamp made of tungsten or the like by laser processing or the like, the electrode plug for the discharge lamp of the insertion portion can be remarkably improved. The bonding strength between the glass tubes; according to this knowledge, the present invention is finally completed. [First Embodiment] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the following drawings, constituent elements that substantially have the same function are denoted by the same reference numerals in order to simplify the description. Further, the present invention is not limited to the following embodiments. The cold cathode fluorescent lamp 100, the electrode structure 20, and the electrode plug 22 for a discharge lamp are described with reference to Figs. 1 to 3, and the cold cathode fluorescent lamp 100 and the electrode structure according to the first embodiment of the present invention are described. 20 and an electrode plug 22 for a discharge lamp. Fig. 1 is a cross-sectional view showing the structure of a cold cathode fluorescent lamp 1 (hereinafter simply referred to as "cold cathode fluorescent lamp 100") in the present embodiment, and Fig. 2 is a cold 12 201118914 cathode fluorescent lamp 100. An enlarged view of the end portion 1〇a sealed by the glass beads 15. Further, Fig. 3 is a structural view showing an electrode plug 22 (hereinafter simply referred to as "electrode pin 22") for a discharge lamp of a cold cathode fluorescent lamp. The cold cathode camping lamp 1GG is composed of a glass tube 1 (), a phosphor layer 12 formed on the inside of the tube 1 and an electrode structure (4). The glass (4) is composed of a glass tube in which the end portion 10a is closed by the glass beads 15, and mercury (Hg) is sealed inside the glass tube. The phosphor layer 12 is composed of, for example, a phosphor powder and an adhesive (adhesive). The electrode structure 20 is composed of a combination of a rod-shaped electrode plug body 21, an electrode 24 connected to one end portion of the 10-electrode plug body 21, and an external lead 26 connected to the other end portion of the electrode plug body 21. Further, in the cold cathode fluorescent lamp 100, the electrode 24 is located inside the glass tube 1〇〇, and the external lead 26 is located outside the glass tube 1〇〇. Further, there are cases where the counter electrode pin and the external lead wire are referred to as electrode pins for a discharge lamp. 15 The electrode plug 22 is fixed to the end of the glass tube 1〇 by a glass bead 15 l〇a. Specifically, it is provided in a state in which the portion sealed by the glass beads 15 is placed, and the portion is covered with the glass beads 15 with respect to the peripheral surface, and is fixed to the end portion 10a of the glass tube 10. The electrode plug 22 is composed of, for example, tungsten (W) or molybdenum (Mo). The electrode plug 2? 22' of the cold cathode fluorescent lamp 100 of the present embodiment is an example of a tungsten (w) pin. The electrode 24 is made of nickel (Ni), niobium (Nb), molybdenum (Mo), tungsten (W), etc., and the electrode 24 of the cold cathode fluorescent lamp of the present embodiment is an example of a bottomed tube. A cup-shaped electrode formed of nickel (Ni). Further, the external lead 26 is made of, for example, nickel (Ni) or iron-nickel alloy (dumet), and the external lead 26 of the fluorescent lamp 100 of the present invention is a metal lead made of nickel (Ni). line. The electrode plug 22 of the present embodiment includes the electrode plug body 21 and a portion (the sealing portion) 17 that is sealingly connected to the end portion 10a of the glass tube 1 in the surface of the electrode plug body 21 across the electrode plug body 21 The groove 30 of the line 35 long (the imaginary line 37 parallel to the long direction 35 of the 5th figure). In other words, in the configuration of the present embodiment, the groove 3 is formed in the surface of the electrode plug body 21 by the sealing of the glass beads. More specifically, the electrode plug 22 is, for example, a region (the sealed portion (sealing portion; insertion portion) 17) which is covered by the glass beads 15 in the circumferential surface thereof, and has a shape 10 which is along with respect to the center A groove 3〇 extending in the direction in which the direction of the axis 35 (in the direction of the imaginary line 37 of Fig. 3) intersects. The groove 3 is extended, for example, substantially in a state of substantially surrounding the central axis of the electrode plug body 21, and the irj* glass bead 15 is used to seal the end of the glass tube 1〇. a and a glass member for fixing the 15-electrode pin 22 to the end portion 10a of the glass tube 10, for example, composed of borosilicate glass. Further, in the cold cathode fluorescent lamp of the present embodiment, the glass tube H)' is composed of rotten stone and glassy soil. The acid glass is a glass which reduces the alkali component, so that the influence on the phosphor layer 不2 is reduced, which is preferable. A groove 3〇 formed in the surface of the electrode plug body 21, such as a job groove. This groove 30 is irradiated with a ray by the surface of the electrode plug body 21 made of tungsten (w). The laser force formed by the sigma (such as a YAG laser or a C 〇 2 laser) is in the form shown in Figs. 1 to 3 with respect to the electrode plug 20
201118914 特別是在電極插銷本 、3圈、4圈、6圈、或 本體21之表面將溝槽30螺旋狀形成 體21之表面上形成2圈以上（例如2圈 更多圈數）。 螺旋狀溝槽30時，形成為跨越沿電極插銷本體21長向 5伙線者。具體而言’例如是相對於電極插鎖本體Μ長向 35乂又之方向’實際地環繞在軸周圍—圈之狀態。 又’以溝槽3〇來說，除了第1圖至第3圖解之螺旋狀 溝槽之外，其他亦可形成諸如連結溝槽一端及另—端之環 狀/冓槽。其環狀溝槽例如形成2條以上。 1〇 溝_之深度，例如在G.5//m以上。藉f射加工形成 溝槽3〇時，溝槽30之深度可做成諸如3 ^ m至心岭。又， 溝槽30之開口寬度可做成玻璃珠15易於進入之寬度，諸如5 ^以上之寬度。此外，較佳的是，溝伽開口寬度係^ m以上且以下之範圍内。 15 如第3圖所示，螺旋狀溝槽30之間隔d(或間距）可做成諸 如l〇//m至500ym，又，可形成螺旋狀溝槽3〇之區域之長 度a(沿長向35之長度），可做成諸如0.3〇1111至1 5mm。或者 是，形成螺旋狀溝槽30之區域的長度a可做成相對於電極插 銷本體21長向35之長度L之特定比率（例如1〇%至5〇%)。 20惟，溝槽30之形狀、大小（深度、間隔d、長度a、螺旋長度 等）配合各種條件（電極插銷本體21之材質或形狀（直徑、長 度等）、封接部17之熔接條件等），可適當地採用合適者。 2·形成在電極插銷本體21之表面之溝槽30之剖面形狀 利用第4圖，說明形成在電極插銷本體21之表面之溝槽 15 201118914 30之剖面形狀。 如第4圖所示，在電極插銷本體21之表面上形成跨越沿 電極插銷本體21長向35之線37延伸之溝槽3〇，其溝槽3〇之 凹部形成為使玻璃珠15之一部分插入其中，藉此，可提高 5電極插銷22(或電極插銷本體21)與玻璃珠14間之封接強度 (封接性）。 更進一步說明，電極插銷本體21 (例如鶴（w)製之插銷） 和玻璃珠15兩者之熱膨脹係數不同，兩者之間就算是具有 目測也看不到之等級的差異，亦有可能產生些微的間隙。 1〇藉其間隙所造成之影響，而提高了產生封接部17之漏氣 (即’玻璃管10之内部與大氣間之連通)50之可能性，但一在 電極插銷本體21之表面形成溝槽30時，形成為在溝槽3〇之 凹部嵌入玻璃珠15之構造’因此可防止或減輕其漏氣5〇之 產生。 15 尤其是藉雷射加工形成溝槽30時，溝槽30是藉金屬（例 如鎢（W))之熔融形成的’因此如第$圖所示，在溝槽3〇之凹 4的周圍亦可設置凸部.即，溝槽3〇可做成具有由電極插 銷本體21之表面凹陷之凹部及連接該凹部且由其電極插銷 本體21表面凸起且相對於剖面中心更高之凸部的形狀。藉 採用如此構4 ’可提昇抑制電極插銷本體以與玻璃珠^之 間漏氣50發生之效果。 3♦放電燈用電極插銷22及溝槽3〇 其-人，一邊參考第6圖至第10圖，更進一步說明本第1 實&㈣之冷陰極螢光燈⑽之放電燈用電極插銷22及溝 16 201118914 槽30°第6圖至第ι〇圖模式地顯示電極插銷22之構造立體 圖0 如上述’電極插銷22(或電極插銷本體21)由鎢(W)或鋇 (Mo)形成時，電極插銷22(或電極插銷本體21)藉由型鍛加工 5或拉延加工拉伸鎢(W)或鉬(Mo)而製造者β此時，如第6圖 所不，在電極插銷本體21之表面21a有時有沿電極插銷本體 21長向35延伸之缺陷（如與拉延方向平行之微小裂痕(crack) 55存在。一有該缺陷55的存在，發生因該缺陷55所造成之 間隙引起之漏氣之可能性就會提高。 在本實施型態之冷陰極螢光燈1〇〇中，如第7圖所示， 在電極插銷本前之表面21a形成螺旋狀溝槽3()(即，跨越 沿電極插銷本體21長向35之線37之溝槽·因此可藉該溝 槽3〇切斷沿電極插銷本體21長向％延伸之缺陷55。又，如 ㈣第4圖及第5圖說明所述，在溝槽3〇之内部有作為玻璃 官10之一部分之破璃珠15塞入其中。 因此，在本實施型態之冷陰極螢光燈卿中，藉於電極 =銷本㈣之表面上形成溝㈣，可解決因缺⑽引起之 漏乳50(例如，在產品完成後在 ⑽wM)之問題。 長時間下產生漏氣之慢漏 15 35延伸之缺陷55切斷之溝 藉環狀溝槽30,亦可防止 由將沿電極插銷本體21長向 槽30的作用來看，如第8圖所示， 乃至於抑制漏氣50之效果。 17 201118914 此外，如第ίο圖所示，即使是在電極插銷本體21之表 面21a具有凹部之溝槽，且與電極插銷本體21之長向％平行 之溝槽32(即，不與沿長向35之線37交又之溝槽32)時，不能 切斷沿電極插銷本體21之長向35延伸之缺陷55，因此不能 5得到本實施型態之防止漏氣50之效果。 4·封接強度 其次，一邊參考第11圖至第14圖，一邊說明提昇本實 施型態之構造所致之封接強度。 本發明人乃為了封接強度實驗之用，形成第丨丨圖所示 10之實驗樣本，測定其強度。如第11圖所示，實驗樣本係構 造成對於電極插銷本體21之表面上形成有溝槽3〇之區域， 被玻璃珠15覆蓋之構造。又，電極插銷22係具有形成有溝 槽30之電極插銷本體21及連接於電極插銷本體21之一端部 之引線（外部引線)26而構成者。電極插銷本體21及外部引線 15 26之直徑各為〇.8mm。 具體而言，如第12圖所示，以熔接而將電極插銷本體 21與外部引線26相互連接之後，在於其溶接隆起部25支撲 之狀‘4下插入玻璃珠15(箭頭60)’其次，使玻璃珠15熔接（覆 接)於電極插銷本體21。依此構成，製作第丨丨圖所示之實驗 20樣本。此外，在本實驗所使用之電極插銷本體21係由鎢(W) 構成’外部引線26係由鎳(Ni)構成。 將封接強度之實驗結果示於第13及14圖。為了測定第 11圖所示之實驗樣本之封接強度（密封強度），而拉伸外部引 線26，由電極插銷本體21欲取下玻璃珠15時知道，在取下 18 201118914 玻璃珠15之前，鎳(Ni)製之外部引線26會被切斷。 第13圖所示之樣本A係形成有圈數為6之螺旋狀溝槽 3〇(溝槽之深度10// m)。樣本B係形成有圈數為3之螺旋狀溝 槽30(溝槽之深度i〇//m)者’又’樣本C為形成有圈數為3 5 之螺旋狀溝槽30(溝槽之深度5"m)者。 調查作為比較例之電極插銷本體之表面上未形成溝槽 之實驗樣本之密接強度時，如第14圖所示，拉伸外部引線 26時，使玻璃珠15脫離放電燈用電極插銷22，沒有發生外 部弓丨線26之切斷。此時之破壞強度（比較例之破壞強度）之平 10均強度為192.7N(韋布爾（Weibll)係數22.9)。為此，形成溝 槽30時之破壞強度成為遠大於此之強度（實際上，密接性優 異到可引起外部引線26之切斷般之狀態，因此未能進行破 壞強度之測定）。 其次’本發明人製作了具有電極插銷22之冷陰極螢光 15 燈100 ’進行對其冷陰極螢光燈1〇〇施與熱應力之評價實 驗。此實驗如下進行。 首先，將冷陰極螢光燈100之外部引線26之部分浸泡在 維持於350X：之焊料中30秒後，在自然放冷下冷卻到室溫， 如此操作反覆進行10次。如此進行，對封接部17反複地施 與應力之後，再使燈100固持在10氣壓的大氣中48小時。之 後’進行冷陰極螢光燈100之點燈實驗。結果知道，本實施 型態之具有電極插銷20之冷陰極螢光燈100中，全部的樣本 都點免’且顯示如設計般之亮度及發光光譜。此外，在電 極杨銷本體之表面上未形成溝槽之習知技藝之冷陰極螢光 201118914 燈（比較例）中，可以看到100支中有1支至3支的比例為不點 亮之樣本。 進而，本發明人係進行本實施型態之冷陰極螢光燈1〇〇 之外部引線26施予彎曲應力之評價實驗。此實驗如下進 5 行。首先，將冷陰極螢光燈100之外部引線26相對於電極播 銷本體21之長向35直角彎曲，對封接部π施加彎曲應力。 之後，將燈100維持在10氣壓之大氣中48小時，與上述同 樣，進行冷陰極螢光燈100之點燈實驗。結果知道，本實施 型態之具有電極插銷22之冷陰極螢光燈1〇〇全部的樣本都 10 點冗’顯示如設計般之免度及發光光譜。此外，在電極插 銷本體之表面上未形成溝槽之習知技藝之冷陰極螢光燈 (比較例）中，可以看到100支中有i支至4支的比例為不點亮 之樣本。 5·冷陰極螢光燈1〇〇及電極構造體20之製造方法 15 其次’一邊參考第15及16圖，一邊說明本實施型態之 冷陰極蝥光燈100及電極構造體20之製造方法。第15及16圖 係說明本實施型態之製造方法之製程剖視圖。 首先，如第15(a)圖所示，製造在電極插銷本體21之表 面形戍有溝槽30之電極插銷22。形成有溝槽30之電極插销 20 22係於準備了電極插銷本體21之後，藉於電極插銷本體21 之表面形成跨越電極插銷本體21長向35之線之溝槽3〇而製 造者。溝槽30之形成係藉雷射加工（例如使用YAG雷射或 C〇2雷射）實施者。惟，只要可形成跨越沿電極插銷本體2ι 長向35之線之溝槽30時，其手法為化學式的蝕刻，或機械 20 201118914 加工都無所謂。 ，溝槽30,例如藉使電極插銷本_以其長向之中心轴 曰做轉轴而-邊紅轉’於其表面形成凹部時即可得到者。 如上述，溝槽30可為螺旋狀溝槽，亦可為環狀溝槽，其他 5形狀亦可。此外，電極插銷本體川系可藉拉延加工而將構 成金屬材料(例如鎢(W))拉伸，切斷成預定長度而得到者。 在其拉延加工時，有產生沿電極插銷本體長向％之缺陷 55之情況發生，因此以實施本實施型態之構成(形成溝槽3〇) 為佳。 10 例如’由Fe細之合金構成之電極插銷本體21係有產 生沿電極插銷本體21長向35之缺陷55之情況發生因此採 用本實施型態之構成上係有其技術意義存在。 其次’如第15(b)圖所示’在形成有溝槽3〇之電極插銷 本體21之-端部(例如一端面）配置外部引線％。接著，如第 15 15⑷圖所示’藉炫接而將電極插銷本體21與外部引線财 接。此外’藉溶接，有於外部引線26之-端側(電極插銷本 體21之側)形成炫接隆起部25之情況發生。又，先將溝槽3〇 1成在電極插銷本體21之長向中之中央處時，可得到下述 製程上的ϋ處，即’可使電極插銷本體^與外部引線％之 20連接方向在電極插銷本體之一端部側與另_端部側之任 —側者。 之後’如第l5(d)圖所示，在形成有溝槽3〇之電極插銷 本體21插入玻璃珠15。此時，玻璃珠15係插入而形成覆蓋 溝槽30之狀態。在本實施型態之製造方法中，溶接隆起部 21 201118914 25發揮玻璃珠15之定位構件之作用。 其次，如第16(a)圖所示，使玻璃珠15和電極插銷本體 21炫接。此炫接係藉加熱玻璃珠15而進行。其次，如第16(b) 圖所示’在電極插銷本體21之另一端部（例如另一端面）夢炫 5 接而連接電極24，得到電極構造體20。 藉電極24在炫接時之熱，有可能使玻璃珠15與電極插 銷本體21間之密接度降低之情況發生，但以本實施型態之 構造時’在電極插銷本體21之表面形成有溝槽3〇，因此密 接度提昇’因此在如此溶接時有熱產生之時，亦可有效地 10 抑制玻璃珠15與電極插銷本體21間之密接度降低之狀況。 其次’如第16(c)圖所示，令電極24為前端，將電極構 造體20插入玻璃管1〇之中。接著，藉加熱熔融設於電極構 造體20之玻璃珠15及玻璃管1〇，使兩者密接，在封接部17 熔接後，即得到本實施型態之冷陰極螢光燈1〇〇。 15 又’在將電極構造體20插入玻璃管1〇之中之步驟的前 後’執行朝玻璃管10之内面形成螢光體層12之形成步驟、 朝玻璃管10導入水銀之水銀導入步驟、及封入氣體導入步 驟等》 6·有關冷陰極螢光燈1〇〇之製造方法之變形 20 本實施型態之冷陰極螢光燈100亦可依第17圖所示製 造者。 首先’在執行第15(c)圖所示之步驟後，如第17(a)圖所 不’在電極插銷本體21之另一端部（例如另一端面）藉熔接而 連接杯形電極24。 22 201118914 其次，如第17(b)圖所示，將玻璃珠15熔接於電極插銷 本體21。接著，如第17(c)圖所示，將電極構造體2〇插入玻 璃管10之中，以封接部17相互熔接後，即可得到本實施型 態之冷陰極螢光燈100。 5 又，在由冷陰極螢光燈組裝背光單元之組裝步驟時， 對冷陰極螢光燈之外部引線26外加了應力，藉此，使於封 接部17之電極插銷本體21之表面與玻璃珠15之間有可能產 生漏氣之情況發生，但在本實施型態之構造中，藉於電極 插銷本體21之表面形成有溝槽30，可提昇封接部17之封接 10 強度，如此問題亦可獲得解決。 除此之外，在依冷陰極螢光燈之漏氣情況即決定背光 單7L之哥命，乃至於液晶顯示裝置之壽命亦即被決定之狀 況下，以本實施型態之構造時，可謀求背光單元之壽命及 液晶顯示裝置之壽命之提昇。 進而，依本實施型態之構造，封接部17之強度的提昇 =藉溝槽3G之形成而實現，因此可在不必使用複雜的構成 或昂責的構件，即可滿足長壽命及高可靠性，結果連同成 本面在内，技術價值極高。 a如上，藉合適的實施型態說明本發明，但其等記述不 2〇疋限定事項，當然可做各種改變。 [第2實施型態] 利用第18圖，說明本發明之第2實施塑態之照明 如第18圖所示，本發明之第2實施型態之照明裝置4〇〇 23 400。 201118914 係直下式背光單元，包含有：一面開口之長方體形狀之殼 體4(Π、收容在該殼體401之内部之多數燈100、用以實現與 可使燈100點亮之點燈電路（未示於圖中）做電性連接之插座 402、及覆蓋殼體401之開口部之光學薄片403。 5 此外，本實施型態之照明裝置400之燈100係採用上述 第1實施型態之冷陰極螢光燈1〇〇。 殼體401係由諸如聚乙烯對苯二甲酸酯（PET)樹脂製造 的’藉銀(Ag)等金屬之蒸锻，於其内面形成反射面404。 此外，以殼體401之材料而言，除了樹脂材料以外之材 10 料，亦可採用諸如鋁（Ai)或冷軋材料（例如SPCC)等之金屬 材料等。又，於内面作為反射面404時，除了金屬蒸鍍膜之 外’亦可使用例如在殼體401附著藉於聚對苯二甲酸乙二醇 酯（PET)樹脂添加碳酸鈣、二氧化鈦等以提高反射率之反射 薄片者。 15 在殼體401之内部配置有插座402、絕緣體405及罩蓋 406。插座402係對應於燈1〇〇之配置，在殼體401之短向（縱 向）上各隔著預定間隙而設置者。插座4〇2係將諸如由不鏽 鋼或磷青銅構成之板材加工所形成者，具有可使外部引線 l〇4b嵌入之嵌入部4〇2a。接著，引線1〇3係彈性變形地嵌進 20 截入部402a ’且使嵌入部402a形成被擠開之狀態。結果使 嵌進嵌入部402a之外部引線103a係藉嵌入部402a之復原力 擠壓’而難以脫落。藉此’可易使外部引線103a嵌進嵌入 部402a ’且其—端嵌入後，就能難以脫離。 插座402係以絕緣體405覆蓋，且在相互鄰接之兩插座 24 201118914 402、402之間不會短路。絕緣體405係使用諸如聚對苯二甲 酸乙二醇酯（PET)樹脂所形成者。 又，絕緣體405不限上述構成者。 插座402係配置於燈1〇〇作動中偏高溫之電極1〇2之近 5旁，因此絕緣體405使用具有耐熱性之材料構成為佳。例 如’具有耐熱性之絕緣體405之材料係可運用聚碳酸酯（PC) 樹脂、或矽橡膠等。 在殼體401之内部，亦可在需要之處設置燈座（iamp holder)407。用以固定位於殼體401内側之燈100的位置之燈 10座407，例如使用聚碳酸酯（ρ〇樹脂，而形成沿著燈1〇〇之 外面形狀構成之形狀。 在此，上述中之「需要之處」係指如燈1〇〇長向中之中 央部附近’燈100是如超過全長600mm般之長條狀燈時，為 了解決燈100之翹曲時所需之處。 15 罩蓋406係用以區隔插座402與殼體401之内側空間 者’例如使用聚碳酸酯（PC)樹脂而構成者，可使插座4〇2之 周邊保溫’且，至少使殼體401側之表面成為高反射性者， 因此可減少燈100之端部的亮度降低。 殼體401之開口部係以透光性光學薄片組4〇3覆蓋予以 2〇密閉，使灰塵或髒物等之異物不會進入内部。光學薄片組 403係堆疊有擴散板408、擴散薄片409及透鏡薄片410而構 成者。 擴散板408，例如使用聚曱基丙烯酸酯甲酯(pMMA)樹 脂所構成之板狀體，配置成可塞住殼體401之開口部。擴散 25 201118914 薄片409，例如使用聚酯樹脂所構成者。透鏡薄片410，例 如使用丙烯酸系樹脂與聚酯樹脂之貼合所構成者。其等光 學薄片組403係各別依次疊在擴散板4〇8而配置者。 如上’依本發明第2實施型態之照明裝置400，具有優 5 異之可靠性。 [第3實施型態] 利用第19圖’說明本發明第3實施型態之照明裝置 500。第19圖係本發明第3實施型態之照明裝置500之立體圖 (局部省略圖）。 10 如第19圖所示，本發明第3實施型態之照明裝置500係 邊緣發光式之背光單元，其構造包含有反射板5(U、燈100、 插座（未示於圖中）、導光板502、擴散薄片403及聚光薄片504 等。 反射板501係配置成包圍導光板5〇2之周圍，除液晶面 15 板側（箭頭符號Q)，具有覆蓋底面之底面部501a、及覆蓋燈 100之周圍之曲面狀燈側面部501c，使由燈100照射之光線 由導光板502反射到液晶面板（未示於圖中）侧（箭頭符號 Q)。又，反射板501係由諸如在薄膜狀之聚對苯二曱酸乙二 醇酯(PET)上蒸鑛銀(Ag)者，或與紹等之金屬箔堆疊者等所 20 構成。 插座（未示於圖中）係具有與上述第2實施型態之照明裝 置400所使用之插座402實質上同一之構成者。 導光板502係用以將藉反射板501反射之光線引導至液 晶面板側者，由例如透光性塑膠所構成，疊層在設於照明 26 201118914 裝置500之底面之反射板501a之上。又，以構成材料而古， 可適用聚碳酸酯(PC)樹脂或環烯烴系樹脂(COP)等。 擴散薄片503係用以擴大視野者，例如由聚對笨二甲酸 乙二醇酯樹脂或聚酯樹脂製之具有擴散透過功能之薄 5 構成，疊層於導光板502之上。 聚光薄片504係用以提高亮度者，例如由貼合内稀酸系 樹脂及聚酯樹脂而形成之薄片構成，疊層在擴散薄片5〇3之 上。又，亦可在聚光薄片504之上更疊層擴散薄片5〇3。 本發明之第3實施型態之照明裝置500，亦可為另—態 1〇 樣，即燈1〇〇之周向中一部分(插入照明裝置500時之導光板 502側）除外’在玻璃管1〇之外面設置反射薄片（未於圖中顯 示）之開孔（aperture)型的燈。 如上，依本發明第3實施型態之照明裝置5〇〇，具有優 異之可靠性。 15 [第4實施型態] 利用第20圖，說明本發明第4實施型態之液晶顯示裝置 700之構造。 如第20圖所示’本發明第4實施型態之液晶顯示裝置 700例如為32inch的液晶電視機，其構造含有··具備液晶面 20板等之液晶畫面單元卜上述第2實施型態之照明裝置4〇〇 及點燈電路702。 液晶畫面單元701為公知裝置，具有液晶面板(彩色濾 色器基板、液晶、TFT基板等：於圖中省略顯示），根據由 外部所輸入之影像訊號，形成影像。 27 201118914 點燈電路702係一用以點亮驅動上述照明裝置400内部 之燈100之電路。又，燈100之點亮頻率為40kHz至100kHz， 燈電流係以3.0〇1八至25111八作動。 又，在本發明第4實施型態中，以液晶顯示裝置7〇〇之 5 照明裝置而言係適用上述照明裝置400為一例，但除此之 外，亦可採用上述照明裝置500。 如上’以本發明第4實施型態之液晶顯示裝置7〇〇，可 確保高品質之顯示品質。 [產業利用性] 0 本發明係可利用於以簡潔構造，實現可靠性佳之放電 燈(冷陰極螢光燈）、照明裝置及液晶顯示裝置。 【圖式簡單說明】 第1圖係模示地顯示本發明第1實施型態之冷陰極螢光 燈100之剖視圖。 5 第2圖係冷陰極螢光燈100之插通部分（封接部）17之放 大圖。 第3圖係模式地顯示電極插銷22之構造圖。 第4圖係溝槽30周邊之剖視圖。 第5圖係溝槽30周邊之剖視圖。 0 第6圖係模式地顯示電極插銷22之構造立體圖。 第7圖係模式地顯示電極插銷22之構造立體圖。 第8圖係模式地顯示電極插銷22之構造立體圖。 第9圖係模式地顯示電極插銷22之構造立體圖。 第10圖係模式地顯示電極插銷22之構造立體圖。 28 201118914 第11圖係圖式代用照片，顯示實驗樣本之構造。 第12圖係用以說明實驗樣本之構造之剖視圖。 第13圖係圖式代用照片，顯示強度實驗之結果。 第14圖係圖式代用照片，顯示強度實驗之結果。 5 第15(a)至15(d)圖係製程剖視圖，說明第1實施型態之 冷陰極螢光燈100之製造方法。 第16(a)至16(c)圖係製程剖視圖，說明第1實施型態之 冷陰極螢光燈100之製造方法。 第17(a)至17(c)圖係製程剖視圖，說明第1實施型態之 10 冷陰極螢光燈100之製造方法。 第18圖係顯示第2實施型態之照明裝置40 0之構造之分 解立體圖。 第19圖係顯示第3實施型態之照明裝置5 0 0之構造之立 體圖（局部省略剖視圖）。 15 第20圖係顯示第4實施型態之液晶顯示裝置700之構造 之立體圖（局部省略剖視圖）。 【主要元件符號說明】 21.. .電極插銷本體 21a...表面 22".電極插銷 24…杯形電極 25…雜驗部 26.. .外部引線 10.. .玻璃管 10a...玻璃管之端部 12…螢光體層 15…玻璃珠 17.. .插通部制封接部) 20.. .電極構造體 29 201118914 30…溝槽 35.. .長向 37.. .彳民想線 50.. .漏氣 55.. .缺陷 60…前頭. 100.. .冷陰極螢光燈 103…引線 103a·.·外部引線 400.500.. .照明裝置 401…殼體 402…插座 402a. ··嵌入部 403.. .光學薄片組 404.. .反射面 405…絕緣體 406.. .罩蓋 407…燈座 408…擴散板 409.. .擴散薄片 410.. .透鏡薄片 501.. .反射板 501a...底面部 501c...燈側面部 502.. .導光板 503.. .擴散薄片 504.. .聚光薄片 700.. .液晶顯示裝置 701.. .液晶畫面單元 702.. .點燈電路 a^L...長度 d...間隔 30201118914 In particular, two or more turns (for example, two turns of more turns) are formed on the surface of the spirally-formed body 21 of the groove 30 on the surface of the electrode plug, three turns, four turns, six turns, or the body 21. In the case of the spiral groove 30, it is formed so as to span the length of the line along the electrode plug body 21. Specifically, for example, it is in a state of being around the circumference of the shaft with respect to the direction in which the electrode latch body Μ is 35 乂. Further, in the case of the groove 3, in addition to the spiral groove of Figs. 1 to 3, a ring-shaped/groove such as one end of the connection groove and the other end may be formed. For example, two or more annular grooves are formed. 1〇 The depth of the groove _, for example, above G.5//m. When the trench 3 is formed by f-machining, the depth of the trench 30 can be made, for example, from 3 μm to the core. Further, the opening width of the groove 30 can be made to have a width in which the glass beads 15 can easily enter, such as a width of 5 or more. Further, it is preferable that the groove width of the groove is in the range of not less than m m and not more. 15 As shown in Fig. 3, the interval d (or pitch) of the spiral groove 30 can be made, for example, from 10 〇//m to 500 ym, and the length a of the region where the spiral groove 3 可 can be formed (along the length) To the length of 35), it can be made, for example, from 0.3 1111 to 15 mm. Alternatively, the length a of the region where the spiral groove 30 is formed may be made to be a specific ratio (e.g., 1% to 5%) with respect to the length L of the length 35 of the electrode pin body 21. 20, the shape and size (depth, interval d, length a, spiral length, etc.) of the groove 30 are matched with various conditions (material or shape (diameter, length, etc.) of the electrode plug body 21, welding condition of the sealing portion 17, and the like. ), suitable persons can be suitably employed. 2. Cross-sectional shape of the groove 30 formed on the surface of the electrode plug body 21 The cross-sectional shape of the groove 15 201118914 30 formed on the surface of the electrode plug body 21 will be described using Fig. 4 . As shown in Fig. 4, a groove 3A extending across the line 37 extending along the longitudinal direction 35 of the electrode plug body 21 is formed on the surface of the electrode plug body 21, and the recess of the groove 3 is formed such that a part of the glass bead 15 is formed. By inserting therein, the sealing strength (sealing property) between the 5-electrode pin 22 (or the electrode plug body 21) and the glass beads 14 can be improved. It is further explained that the thermal expansion coefficients of the electrode plug body 21 (for example, the plug made of crane (w)) and the glass beads 15 are different, and even if there is a difference in the level which is not visually observed, it may be generated. A slight gap. 1. The possibility of generating a leak of the sealing portion 17 (i.e., the communication between the inside of the glass tube 10 and the atmosphere) 50 is increased by the influence of the gap, but is formed on the surface of the electrode plug body 21 In the case of the groove 30, the structure in which the glass beads 15 are embedded in the concave portion of the groove 3' is formed to prevent or reduce the occurrence of air leakage. In particular, when the trench 30 is formed by laser processing, the trench 30 is formed by melting of a metal such as tungsten (W). Therefore, as shown in Fig. 1, the recess 4 of the trench 3 is also surrounded. The convex portion may be provided. That is, the groove 3A may be formed to have a concave portion recessed by the surface of the electrode plug body 21 and a convex portion which is joined to the concave portion and which is convex by the surface of the electrode plug body 21 and which is higher with respect to the center of the cross section. shape. By adopting such a configuration, the effect of suppressing the leakage of the electrode plug body with the glass bead 50 can be enhanced. 3♦ Electrode pins 22 for discharge lamps and grooves 3, and the electrode pins for discharge lamps of the cold cathode fluorescent lamps (10) of the first and the fourth (4) are further described with reference to FIGS. 6 to 10. 22 and groove 16 201118914 Slot 30° Fig. 6 to Fig. 模式 schematically shows the configuration of the electrode plug 22. Fig. 0 The above-mentioned 'electrode pin 22 (or electrode plug body 21) is formed of tungsten (W) or yttrium (Mo). At this time, the electrode plug 22 (or the electrode plug body 21) is manufactured by swaging processing 5 or drawing processing of tungsten (W) or molybdenum (Mo). At this time, as shown in Fig. 6, the electrode plug is used. The surface 21a of the body 21 sometimes has a defect extending along the longitudinal direction 35 of the electrode plug body 21 (e.g., a small crack 55 parallel to the drawing direction. The presence of the defect 55 occurs due to the defect 55. The possibility of the air leakage caused by the gap is increased. In the cold cathode fluorescent lamp of the present embodiment, as shown in Fig. 7, the spiral groove 3 is formed on the surface 21a before the electrode plug. () (ie, a groove that spans the line 37 along the length 35 of the electrode plug body 21) so that the electrode pin can be cut along the electrode 3 The body 21 has a defect 55 extending in the length direction. Further, as described in the fourth and fifth figures of the fourth section, the glass beads 15 which are a part of the glass officer 10 are inserted into the groove 3〇. Therefore, In the cold cathode fluorescent lamp of this embodiment, the groove (4) is formed on the surface of the electrode = pin (4), and the problem of the leaking milk 50 caused by the lack of (10) (for example, at (10) wM after the completion of the product) can be solved. The leakage of the leaking gas 15 35 for a long time is extended. The defect 55 is cut by the annular groove 30, and can also be prevented from being affected by the action of the length of the electrode plug body 21 toward the groove 30, as shown in Fig. 8. It is shown that the effect of the blow-by gas 50 is suppressed. 17 201118914 Further, as shown in Fig. 00, even if the surface 21a of the electrode plug body 21 has a groove of a concave portion and is parallel to the long direction % of the electrode plug body 21 When the groove 32 (i.e., the groove 32 that does not intersect the line 37 along the longitudinal direction 35) cannot cut the defect 55 extending along the long direction 35 of the electrode plug body 21, the present embodiment cannot be obtained. Prevent the effect of air leakage 50. 4. Seal strength Next, while referring to Figure 11 to Figure 14, one side The inventors have improved the sealing strength due to the structure of the present embodiment. The inventors have used the experimental sample shown in Figure 10 to measure the strength for the sealing strength test. As shown in Fig. 11, The experimental sample is configured to cover the region where the groove 3 is formed on the surface of the electrode plug body 21, and is covered by the glass beads 15. Further, the electrode plug 22 has the electrode plug body 21 in which the groove 30 is formed and is connected to The lead (outer lead) 26 of one end of the electrode plug body 21 is formed. The diameters of the electrode plug body 21 and the outer lead 15 26 are each 〇8 mm. Specifically, as shown in Fig. 12, after the electrode plug body 21 and the external lead 26 are connected to each other by welding, the glass beads 15 (arrow 60) are inserted in the shape of the ridge portion 25 of the fusion ridge portion 25. The glass beads 15 are welded (covered) to the electrode plug body 21. Based on this, a sample of the experiment 20 shown in the figure is produced. Further, the electrode plug body 21 used in this experiment is composed of tungsten (W). The outer lead 26 is made of nickel (Ni). The experimental results of the sealing strength are shown in Figures 13 and 14. In order to measure the sealing strength (sealing strength) of the experimental sample shown in FIG. 11 and stretch the outer lead 26, it is known from the electrode plug body 21 that the glass bead 15 is to be removed, before removing the 18 201118914 glass bead 15 The outer lead 26 made of nickel (Ni) is cut. The sample A shown in Fig. 13 is formed with a spiral groove 3 of a circle number 6 (the depth of the groove is 10//m). The sample B is formed with a spiral groove 30 having a number of turns 3 (the depth of the groove i〇//m), and the sample C is a spiral groove 30 formed with a number of turns of 5 (the groove Depth 5"m). When the adhesion strength of the test sample in which the groove was not formed on the surface of the electrode plug body of the comparative example was investigated, as shown in Fig. 14, when the outer lead 26 was stretched, the glass beads 15 were separated from the electrode plug 22 for the discharge lamp, and there was no The cutting of the outer bow line 26 occurs. The breaking strength at this time (the breaking strength of the comparative example) was 192.7 N (Weibll coefficient 22.9). For this reason, the breaking strength at the time of forming the groove 30 is much larger than this (in fact, the adhesion is excellent so that the external lead 26 can be cut off, so that the measurement of the breaking strength cannot be performed). Next, the inventors made a cold cathode fluorescent lamp 15' having an electrode plug 22 to carry out an evaluation experiment of the thermal stress of the cold cathode fluorescent lamp. This experiment was carried out as follows. First, the portion of the outer lead 26 of the cold cathode fluorescent lamp 100 was immersed in the solder maintained at 350X: for 30 seconds, and then cooled to room temperature under natural cooling, and the operation was repeated 10 times. In this manner, after the stress was repeatedly applied to the sealing portion 17, the lamp 100 was held in an atmosphere of 10 atmospheres for 48 hours. Thereafter, a lighting experiment of the cold cathode fluorescent lamp 100 was performed. As a result, it is known that in the cold cathode fluorescent lamp 100 having the electrode plug 20 of the present embodiment, all of the samples are clicked and displayed as a design brightness and luminescence spectrum. In addition, in the cold cathode fluorescent 201118914 lamp (comparative example) in which the groove is not formed on the surface of the electrode poppet body, it can be seen that the ratio of one to three of the 100 is not lit. sample. Further, the inventors of the present invention conducted an evaluation experiment of applying a bending stress to the outer lead 26 of the cold cathode fluorescent lamp of the present embodiment. This experiment is as follows. First, the outer lead 26 of the cold cathode fluorescent lamp 100 is bent at a right angle to the longitudinal direction 35 of the electrode broadcast body 21, and a bending stress is applied to the sealing portion π. Thereafter, the lamp 100 was maintained in an atmosphere of 10 atmospheres for 48 hours, and the lighting experiment of the cold cathode fluorescent lamp 100 was carried out in the same manner as described above. As a result, it is known that all of the samples of the cold cathode fluorescent lamp having the electrode plug 22 of the present embodiment have a 10-point redundancy and exhibit a design-like degree of liberation and an emission spectrum. Further, in the cold cathode fluorescent lamp (comparative example) of the prior art in which no groove is formed on the surface of the electrode pin body, it can be seen that the ratio of i to 4 in 100 is not lit. 5. Cold cathode fluorescent lamp 1〇〇 and manufacturing method of electrode structure 20 Next, the cold cathode fluorescent lamp 100 and the method of manufacturing the electrode structure 20 of the present embodiment will be described with reference to FIGS. 15 and 16 . . 15 and 16 are cross-sectional views showing the process of the manufacturing method of the present embodiment. First, as shown in Fig. 15(a), an electrode plug 22 having a groove 30 formed in the surface of the electrode plug body 21 is manufactured. The electrode plug 20 22 in which the groove 30 is formed is formed by the groove 3 of the surface of the electrode pin body 21 which is formed by the surface of the electrode pin body 21 after the electrode pin body 21 is prepared. The formation of trenches 30 is performed by laser processing (e.g., using a YAG laser or a C〇2 laser). However, as long as the groove 30 can be formed across the line extending along the length of the electrode plug body 2, the technique is chemical etching, or the processing of the machine 20 201118914 does not matter. The groove 30 can be obtained, for example, by the electrode pin _ with its central axis of the longitudinal direction 曰 as the axis of rotation and the side of the red turn to form a concave portion on the surface thereof. As described above, the groove 30 may be a spiral groove or an annular groove, and the other five shapes may be used. Further, the electrode plug body can be obtained by drawing a metal material (for example, tungsten (W)) by drawing, and cutting it into a predetermined length. In the case of the drawing process, there is a case where the defect 55 along the length of the electrode plug body is generated. Therefore, it is preferable to carry out the configuration of the present embodiment (forming the groove 3). For example, the electrode plug body 21 made of an alloy of Fe is formed to have a defect 55 along the longitudinal direction 35 of the electrode plug body 21. Therefore, the configuration of the present embodiment is technically significant. Next, as shown in Fig. 15(b), the outer lead % is disposed at the end (e.g., one end surface) of the electrode plug body 21 on which the groove 3 is formed. Next, the electrode plug body 21 is affixed to the external lead by the splicing as shown in Fig. 15 15 (4). Further, the occurrence of the splicing of the swelled portion 25 is formed on the end side of the outer lead 26 (the side of the electrode plug body 21). Moreover, when the groove 3〇1 is first formed at the center of the longitudinal direction of the electrode plug body 21, the ridge at the following process can be obtained, that is, 'the direction of the electrode pin body ^ and the external lead wire 20 can be connected. On either one end side of the electrode plug body and the other side of the other end side. Thereafter, as shown in Fig. 15(d), the glass beads 15 are inserted into the electrode plug body 21 in which the grooves 3 are formed. At this time, the glass beads 15 are inserted to form a state in which the grooves 30 are covered. In the manufacturing method of the present embodiment, the fusion ridge portion 21 201118914 25 functions as a positioning member of the glass beads 15. Next, as shown in Fig. 16(a), the glass beads 15 and the electrode plug body 21 are spliced together. This splicing is carried out by heating the glass beads 15. Next, as shown in Fig. 16(b), the other end portion (e.g., the other end surface) of the electrode plug body 21 is connected to the electrode 24 to obtain the electrode structure 20. When the electrode 24 is heated during the splicing, there is a possibility that the degree of adhesion between the glass bead 15 and the electrode plug body 21 is lowered. However, in the configuration of the present embodiment, a groove is formed on the surface of the electrode plug body 21. Since the groove is 3 〇, the degree of adhesion is improved. Therefore, when heat is generated during such a fusion, the degree of adhesion between the glass bead 15 and the electrode plug body 21 can be effectively suppressed. Next, as shown in Fig. 16(c), the electrode 24 is the leading end, and the electrode structure 20 is inserted into the glass tube 1〇. Then, the glass beads 15 and the glass tube 1 provided in the electrode structure 20 are heated and fused to make the two adhere to each other, and after the sealing portion 17 is welded, the cold cathode fluorescent lamp of the present embodiment is obtained. 15 'Steps of forming the phosphor layer 12 on the inner surface of the glass tube 10 before and after the step of inserting the electrode structure 20 into the glass tube 1', a mercury introduction step of introducing mercury into the glass tube 10, and sealing Gas introduction step, etc. 6. Deformation 20 of the method for manufacturing a cold cathode fluorescent lamp 1 The cold cathode fluorescent lamp 100 of the present embodiment can also be manufactured as shown in Fig. 17. First, after the step shown in Fig. 15(c) is performed, the cup electrode 24 is joined by fusion at the other end portion (e.g., the other end surface) of the electrode plug body 21 as shown in Fig. 17(a). 22 201118914 Next, as shown in Fig. 17(b), the glass beads 15 are welded to the electrode plug body 21. Next, as shown in Fig. 17(c), the electrode structure 2 is inserted into the glass tube 10, and the sealing portion 17 is welded to each other to obtain the cold cathode fluorescent lamp 100 of the present embodiment. 5, when assembling the backlight unit by the cold cathode fluorescent lamp, stress is applied to the outer lead 26 of the cold cathode fluorescent lamp, thereby making the surface of the electrode plug body 21 of the sealing portion 17 and the glass There is a possibility that air leakage may occur between the beads 15 , but in the configuration of the present embodiment, the groove 30 is formed on the surface of the electrode plug body 21 to increase the strength of the sealing portion 10 of the sealing portion 17 . The problem can also be solved. In addition, in the case of the leakage of the cold cathode fluorescent lamp, the life of the backlight unit 7L is determined, and even the life of the liquid crystal display device is determined, in the configuration of the present embodiment, The life of the backlight unit and the life of the liquid crystal display device are improved. Further, according to the configuration of the present embodiment, the strength of the sealing portion 17 is improved by the formation of the groove 3G, so that long life and high reliability can be satisfied without using a complicated structure or a conspicuous member. Sex, the result, together with the cost side, has a very high technical value. In the above, the present invention will be described by a suitable embodiment. However, the descriptions of the present invention are not limited thereto, and various changes can of course be made. [Second Embodiment] An illumination device according to a second embodiment of the present invention will be described with reference to Fig. 18. Fig. 18 shows an illumination device 4〇〇23 400 according to a second embodiment of the present invention. 201118914 is a direct type backlight unit, comprising: a housing 4 having an open rectangular parallelepiped shape (a plurality of lamps 100 housed inside the housing 401, and a lighting circuit for realizing the lighting of the lamp 100 ( The optical module 403 which is electrically connected to the socket 402 and the optical sheet 403 which covers the opening of the housing 401. 5 Further, the lamp 100 of the illumination device 400 of the present embodiment adopts the first embodiment described above. A cold cathode fluorescent lamp is used. The casing 401 is formed by steaming of a metal such as silver (Ag) made of, for example, polyethylene terephthalate (PET) resin, and a reflecting surface 404 is formed on the inner surface thereof. In the case of the material of the casing 401, a material other than the resin material may be a metal material such as aluminum (Ai) or a cold-rolled material (for example, SPCC), etc. Further, when the inner surface is used as the reflecting surface 404 In addition to the metal deposition film, for example, a reflective sheet in which a calcium carbonate, a titanium oxide, or the like is added to the shell 401 to increase the reflectance by attaching a polyethylene terephthalate (PET) resin may be used. The inside of the body 401 is provided with a socket 402 and an insulator 405. And a cover 406. The socket 402 is disposed corresponding to the lamp 1〇〇, and is disposed in a short direction (longitudinal direction) of the housing 401 with a predetermined gap therebetween. The socket 4〇2 is composed of, for example, stainless steel or phosphor bronze. The sheet metal forming body has an insertion portion 4〇2a into which the outer lead 104b can be fitted. Then, the lead 1〇3 is elastically deformed into the 20-cut portion 402a' and the embedded portion 402a is formed to be squeezed. As a result, the outer lead 103a of the embedded portion 402a is pressed by the restoring force of the insert portion 402a and is hard to fall off. Thus, the outer lead 103a can be easily fitted into the embedded portion 402a' and its end is embedded. The socket 402 is covered by the insulator 405 and is not short-circuited between the two sockets 24 201118914 402, 402 adjacent to each other. The insulator 405 is made of, for example, polyethylene terephthalate (PET) resin. Further, the insulator 405 is not limited to the above-described configuration. The socket 402 is disposed near the upper side of the electrode 1〇2 which is high in the lamp 1 ,, and therefore the insulator 405 is preferably made of a material having heat resistance. 'has heat resistance The material of the insulator 405 can be a polycarbonate (PC) resin, a ruthenium rubber, etc. Inside the housing 401, an iamp holder 407 can also be provided where necessary. The lamp 10 seat 407 at the position of the inner lamp 100 is formed of a polycarbonate (a resin) to form a shape along the outer surface of the lamp 1 。. Here, the "needs" in the above means For example, when the lamp 100 is in the vicinity of the center portion in the middle of the long direction, the lamp 100 is a long strip lamp having a length of 600 mm, in order to solve the problem required for the warpage of the lamp 100. 15 Cover 406 is used to separate the inner space of the socket 402 and the housing 401 ', for example, using polycarbonate (PC) resin, to keep the periphery of the socket 4 〇 2', and at least to make the housing 401 Since the surface of the side becomes highly reflective, the decrease in brightness of the end portion of the lamp 100 can be reduced. The opening of the casing 401 is sealed by the translucent optical sheet group 4〇3 so that foreign matter such as dust or dirt does not enter the inside. The optical sheet group 403 is constructed by stacking a diffusion plate 408, a diffusion sheet 409, and a lens sheet 410. The diffusion plate 408 is, for example, a plate-like body made of poly(methacrylate acrylate) (pMMA) resin, and is disposed so as to be able to plug the opening of the casing 401. Diffusion 25 201118914 Sheet 409, for example, made of polyester resin. The lens sheet 410 is made of, for example, a combination of an acrylic resin and a polyester resin. The optical sheet group 403 is disposed so as to be stacked on the diffusion plate 4〇8 in this order. As described above, the illumination device 400 according to the second embodiment of the present invention has excellent reliability. [Third embodiment] A lighting device 500 according to a third embodiment of the present invention will be described with reference to Fig. 19'. Fig. 19 is a perspective view (partially omitted) of a lighting device 500 according to a third embodiment of the present invention. As shown in FIG. 19, the illumination device 500 according to the third embodiment of the present invention is an edge-lit backlight unit, and the structure thereof includes a reflector 5 (U, a lamp 100, a socket (not shown), and a guide). The light plate 502, the diffusion sheet 403, the condensing sheet 504, etc. The reflection plate 501 is disposed so as to surround the periphery of the light guide plate 〇2, and has a bottom surface portion 501a covering the bottom surface and covering the liquid crystal surface 15 on the plate side (arrow symbol Q). The curved lamp side surface portion 501c around the lamp 100 causes the light irradiated by the lamp 100 to be reflected by the light guide plate 502 to the liquid crystal panel (not shown) side (arrow symbol Q). Further, the reflection plate 501 is composed of, for example, A film of polyethylene terephthalate (PET) on a silver ore (Ag), or a stack of metal foils, etc. 20. The socket (not shown) has The socket 402 used in the illuminating device 400 of the second embodiment is substantially the same. The light guide plate 502 is used to guide the light reflected by the reflector 501 to the side of the liquid crystal panel, for example, a translucent plastic. The composition is laminated on the bottom surface of the device 500 provided on the illumination 26 201118914 Further, a polycarbonate (PC) resin or a cycloolefin resin (COP) or the like can be applied as a constituent material. The diffusion sheet 503 is used to expand the field of view, for example, by poly(p-dibenzoic acid). A thin film 5 having a diffusion and permeation function made of a glycol ester resin or a polyester resin is laminated on the light guide plate 502. The concentrating sheet 504 is used for improving brightness, for example, by bonding an inner acid resin and The sheet formed of the polyester resin is laminated on the diffusion sheet 5〇3. Further, the diffusion sheet 5〇3 may be further laminated on the concentrating sheet 504. The illumination of the third embodiment of the present invention The device 500 may be in the other state, that is, a part of the circumferential direction of the lamp 1 ( (the side of the light guide plate 502 when the illuminating device 500 is inserted) except that a reflective sheet is disposed outside the glass tube 1 ( (not shown) The above-described illuminating device 5 of the third embodiment of the present invention has excellent reliability. 15 [Fourth embodiment] With reference to Fig. 20, the present invention will be described. The structure of the liquid crystal display device 700 of the fourth embodiment of the invention is as shown in Fig. 20. The liquid crystal display device 700 according to the fourth embodiment of the present invention is, for example, a 32-inch liquid crystal television set, and has a liquid crystal display unit including a liquid crystal panel 20 or the like. The illumination device 4 of the second embodiment described above. And the lighting circuit 702. The liquid crystal screen unit 701 is a known device, and has a liquid crystal panel (color filter substrate, liquid crystal, TFT substrate, etc., which is omitted from the drawing), and forms an image based on an image signal input from the outside. 201118914 The lighting circuit 702 is a circuit for illuminating the lamp 100 driving the inside of the lighting device 400. Further, the lamp 100 is illuminated at a frequency of 40 kHz to 100 kHz, and the lamp current is operated at 3.0 〇 18 to 25111. Further, in the fourth embodiment of the present invention, the illumination device 400 is applied to the illumination device of the liquid crystal display device 7 as an example, but the illumination device 500 may be employed in addition to the above. As described above, the liquid crystal display device 7 of the fourth embodiment of the present invention can ensure high quality display quality. [Industrial Applicability] The present invention is applicable to a discharge lamp (cold cathode fluorescent lamp), an illumination device, and a liquid crystal display device which are excellent in reliability with a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a cold cathode fluorescent lamp 100 according to a first embodiment of the present invention. 5 Fig. 2 is an enlarged view of the insertion portion (sealing portion) 17 of the cold cathode fluorescent lamp 100. Fig. 3 is a view schematically showing the configuration of the electrode plug 22. Figure 4 is a cross-sectional view of the periphery of the trench 30. Figure 5 is a cross-sectional view of the periphery of the trench 30. 0 Fig. 6 is a perspective view showing the structure of the electrode plug 22 in a schematic manner. Fig. 7 is a perspective view showing the structure of the electrode plug 22 in a schematic manner. Fig. 8 is a perspective view showing the configuration of the electrode plug 22 in a schematic manner. Fig. 9 is a perspective view showing the structure of the electrode plug 22 in a schematic manner. Fig. 10 is a perspective view showing the configuration of the electrode plug 22 in a schematic manner. 28 201118914 Figure 11 is a diagram of a substitute photograph showing the construction of an experimental sample. Figure 12 is a cross-sectional view showing the construction of an experimental sample. Figure 13 is a graphical representation of the results of the strength experiment. Figure 14 is a graphical representation of the results of the strength experiment. 5 Sections 15(a) to 15(d) are cross-sectional views showing a method of manufacturing the cold cathode fluorescent lamp 100 of the first embodiment. 16(a) to 16(c) are cross-sectional views showing a method of manufacturing the cold cathode fluorescent lamp 100 of the first embodiment. 17(a) to 17(c) are cross-sectional views showing a method of manufacturing the cold cathode fluorescent lamp 100 of the first embodiment. Fig. 18 is an exploded perspective view showing the structure of the illumination device 40 0 of the second embodiment. Fig. 19 is a perspective view showing a structure of a lighting device 500 of the third embodiment (a partially omitted cross-sectional view). Fig. 20 is a perspective view showing a structure of a liquid crystal display device 700 of the fourth embodiment (a partially omitted cross-sectional view). [Explanation of main component symbols] 21.. Electrode latch body 21a... Surface 22". Electrode latch 24... Cup electrode 25... Miscellaneous section 26. External lead 10: Glass tube 10a... Glass The end portion of the tube 12...the phosphor layer 15...the glass bead 17 .. the plug-in portion of the plug-in portion) 20.. The electrode structure 29 201118914 30...the groove 35.. long-direction 37.. Think line 50.. . leak 55.. . defect 60 ... front. 100.. . cold cathode fluorescent lamp 103 ... lead 103a · · external lead 400.500.. illuminating device 401 ... housing 402 ... socket 402a. · Embedding part 403.. Optical sheet set 404.. Reflecting surface 405...Insulator 406.. Cover 407... Lamp holder 408...Diffuser 409..Diffuser sheet 410.. Lens sheet 501.. Reflecting plate 501a... bottom surface portion 501c... lamp side surface portion 502.. light guide plate 503.. diffusion sheet 504.. concentrating sheet 700.. liquid crystal display device 701.. liquid crystal screen unit 702. .lighting circuit a^L...length d...interval 30