200947503 九、發明說明 【發明所屬之技術領域】 本發明是關於一種被利用於液晶顯示裝置的背面光、 照明等的稀有氣體螢光燈。 【先前技術】 作爲液晶電視所代表的液晶顯示裝置的背面光，檢討 〇 著具備：在內部封入有稀有氣體的直管狀發光管，及形成 於該發光管的內面的螢光體層，及在該發光管的外面朝周 方向隔離且朝管軸方向延伸的方式全面配設於該發光管的 大約全長的一對電極的稀有氣體螢光燈的使用。 稀有氣體螢光燈是如低壓水銀燈地未包含水銀的環境 負荷小的產品，還具有低溫時的光放射的上昇時間短的優 點。在專利文獻1揭示著將外部電極型稀有氣體螢光燈使 用於液晶的背面光的背面光裝置。 Ο 稀有氣體螢光燈是傳統上被廣泛使用作爲在〇A用途 讀取原稿的讀取用光源，具備例如隔離於長度大約30cm 左右的直管狀發光管的外周黏貼寬度8mm的鋁箔，或是 成形塗佈導電性糊的外部電極全面地發光管的大約全長。 又，在發光管內面一部分具備未塗佈螢光體的孔徑部，利 用從該孔徑部所放射的具指向性的光放射。 稀有氣體螢光燈是爲了提高其起動性而在發光管內面 設置導電性物質。在專利文獻2及專利文獻3揭示著將導 電性物質配設於螢光管內面的稀有氣體螢光燈。第4圖是 -5- 200947503 表示傳統的外部電極型稀有氣體螢光燈的槪略立體圖。在 稀有氣體螢光燈1的外周面配置有一對電極2a、2b，而 在對應於該電極間的發光管內面配設有導電性物質3。4 是電壓施加於電極2a、2b間的高頻電源。 專利文獻Μ日本特開2007-213893號公報 專利文獻2:日本特開平8-3 29903號公報 專利文獻3:日本特開平1-273629號公報 【發明內容】 將稀有氣體螢光燈例如使用作爲大畫面顯示器的背面 光時，並不是從習知在ΟΑ用途上所使用的孔徑進行具指 向性的光放射型式的稀有氣體螢光燈，而是必須從發光管 全周進行光放射之故，因而作成在發光管內周大約均勻地 被覆著螢光物質的稀有氣體螢光燈。 又，電極的寬度是爲了增多取光面積，與傳統的ΟΑ 用途上所使用的稀有氣體螢光燈相比較，例如作成0 · 5〜1 ❹ mm。發光管內面的導電性物質是配設成具備於對應於形 成有電極的發光管外面部分的內面部分。 本發明者是製作全長度1000mm、管徑 9.8mm、電極 寬度爲全長全面0.5 mm，內面導電性物質的寬度爲3.0mm 的5支稀有氣體螢光燈，進行點燈試驗，若進行1 0000小 時，發現了在該過程中對所有5支燈徐徐地上昇著起動電 壓。 使用於液晶顯示裝置的背面光時，例如在46英吋的 -6 - 200947503 畫面也成爲使用1〇支以上稀有氣體螢光燈。在該用途上 ，傳統的冷陰極的螢光燈被要求6萬小時的壽命保證，惟 對於稀有氣體螢光燈也被要求同樣的長壽命之故，因而在 長時間點燈而起動電壓的偏差之同時，當起動電壓徐徐地 上昇，則有可能混入點燈的燈與未點燈的燈的燈，而在液 晶畫面上會產生明亮的不方便之虞。又，本發明的目的， 是在於提供一種使用多數支即使超過1萬小時長時間進行 Q 點燈，起動電壓的上昇也少的稀有氣體螢光燈。 爲了解決上述課題的申請專利範圍第1項所述的發明 ，一種稀有氣體螢光燈，是具備：在內部封入有稀有氣體 的直管狀玻璃製發光管，及形成於該發光管的內面的螢光 體層，及在該發光管的外面在周方向隔離且朝管軸方向延 伸的方式全面配設於該發光管的大約全長的一對電極的稀 有氣體螢光燈，其特徵爲：在對應於上述電極的配設部分 的上述發光管內面的端部領域，沿著該發光管內周，帶狀 〇 地配設導電性物質，存在著將該發光管內面的該導電性物 質的帶狀配設領域的管軸方向的至少一方的境界線在該發 光管外面上交叉有該電極的交叉電極部，將該交叉電極部 的電極寬作爲w( mm)，將該發光管外面上與該電極交 叉的該導電性物質的管軸方向的寬度作爲D( mm)，並 將該發光管的外徑作爲F(mm)時，爲6.2SFS12，而 滿足 D2 0.5 且 DxO.5SWSFxO.65 的關係。 申請專利範圍第2項所述的發明是，上述電極的寬度 是從發光管的一方的端，一直到位於另一方的端的上述導 200947503 電性物質近旁爲止大約一樣的寬度，上述交叉電極部的電 極的寬度作成比上述大約一樣的寬度還要寬。 申請專利範圍第3項所述的發明是，上述電極是燒成 導電性糊所成。 申請專利範圍第4項所述的發明是’將上述交叉電極 部的電極以與上述其他部分的電極不同的構件構成。 申請專利範圍第5項所述的發明是’將上述不同構件 作爲ITO膜。 © 在發光管內面配設導電性物質的外部電極型稀有氣體 螢光燈中，針對於長時間點燈下起動電壓徐徐地上昇的現 象，經專心檢討的結果’推測有以下的情形。 第5圖是表示外部電極與發光管內面的導電性物質的 相對性位置關係。以虛線表示外部電極1 3的輪廓’而以 實線表示導電性物質16的輪廓。針對於發光管省略了圖 示。如在第5圖中以斜線部所示地，目視觀察了起動電壓 上昇的燈的導電性物質附近下，由導電性物質1 6與外部 © 電極13交叉的交叉電極部17，確認了沿著外部電極13 的管軸方向的輪廓方向的輪廓，發光管內面的一部分被薄 的著色。此爲藉由在發光管內經由玻璃發生在外部電極 1 3與導電性物質1 6間的障壁放電所致的濺鍍現象，例如 飛散著如碳糊的導電性物質16，可能爲成爲薄膜20附著 於發光管內面者。又，起動電壓的上昇是該薄膜20成爲 原因。以下說明其理由。 在第7 ( a )圖，表示針對於未產生導電性物質1 6的 -8- 200947503 薄膜的階段的稀有氣體螢光燈10，導電性物質16附近的 等値電路。外部電極13a、外部電極13b是相對配置於發 光管11的外面。導電性物質16是配置成重疊於短路發光 管內面的外部電極13a、13b的發光管玻璃的部分的一部 分。又，將重疊於外部電極13a、13b的發光管玻璃的單 位面積附近的靜電容量作爲Cg，將夾在重疊於外部電極 13a、13b的發光管的表面的放電空間19的每一單位面積 0 的靜電容量作爲Cd，而將夾在重疊於外部電極13的發光 管內表面的導電性物質16的電阻作爲Ra。 在第7(b)圖表示重疊於外部電極13a的發光管11 的內表面的電位分布，而在第7(c)圖表示重疊於外部 電極13b的發光管11的內表面的電位分布。外部電極 13a的電位是Va，外部電極13b的電位是0，而在發光管 內部作爲尙未發生放電的狀態。在重疊於外部電極13a、 13b的發光管11的內表面，與放電空間19接觸的部分的 φ 電位是以Cg、Cd的分壓所決定。Cd的大小一般爲Cg的 1/100以下的大小之故，因而電壓是幾乎集中於Cd。因 此，在重疊於外部電極13a的發光管11的內表面而與放 電空間19接觸的部分的電位，是成爲大約Va，而在重疊 於外部電極13b的發光管內表面而與放電空間19接觸的 部分的電位，是成爲大約〇。 在重疊於外部電極13a、13b的發光管11的內面而與 導電性物質16接觸的部分的電位是以Cg、Ra的分壓。 Ra是低電阻之故，因而Cg快速地被充電成Va/2的大小 -9- 200947503 。因此，在重疊於外部電極13a、外部電極13b的發光管 11的內面而與導電性物質16接觸的部分的電位’都是成 爲Va/2。在第7(b)圖、第7(c)圖所示地，重疊於 外部電極13a、外部電極13b的發光管11的內表面的電 位分布，以導電性物質1 6的管軸方向的境界作爲界線急 劇地變化，而強電場產生在該境界部分。藉此’發生成爲 起點的放電，而成爲可確實地進行起動。 在第8(a)圖表示針對於產生導電性物質16的薄膜 @ 20的稀有氣體螢光燈1 〇，導電性物質1 6附近的等値電路 。外部電極13a、外部電極13b是相對配置於發光管11 外面。導電性物質16是配置成短路重疊於發光管11內面 的外部電極13a'外部電極13b部分的一部分。薄膜20 是從導電性物質16的管軸方向的境界部分以數mm至十 數mm長度附著於軸方向。又將重疊於外部電極13a、13b 的發光管玻璃的每一單位面積的靜電容量作爲Cg，將夾 在重疊於外部電極13a、13b的發光管11的內表面的放電 ◎ 空間19的每一單位的靜電容量作爲Cd，將夾在重疊於外 部電極13a、13b的發光管11的內表面的導電性物質16 的電阻作爲Ra，而將薄膜20的每單位長度的電阻作爲 Rb。 在第8(b)圖表示重疊於外部電極13a的發光管11 的內表面的電位分布，而在第8(c)圖表示重疊於外部 電極13b的發光管11的內表面的電位分布。將外部電極 13a的電位是作爲Va，而將外部電極13b的電位是作爲〇 -10- 200947503 ，作爲在發光管內部尙未發生放電的狀態。在重疊於外部 電極13a、13b的發光管11的內表面，與放電空間19接 觸的部分的電位，是以Cg、Cd的分壓所決定。Cd的大小 —般爲Cg的1/100以下的大小之故，因而電壓是幾乎集 中在Cd。因此，在重疊於外部電極13a的發光管11的內 表面而與放電空間19接觸的部分的電位是成爲大約Va， 而在重疊於外部電極13b的發光管11的內表面而與放電 H 空間19接觸的部分的電位，是成爲大約0。 在重疊於外部電極13a、13b的發光管11的內表面， 與導電性物質16的部分的電位，是以Cg、Ra的分壓所 決定。Ra是低電阻之故，因而Cg是快速地被充電成Va /2的大小。因此，在重疊於外部電極13a、外部電極 1 3 b的發光管1 1的內面而與導電性物質1 6接觸的部分的 電位都是成爲Va/ 2。 在重疊於外部電極13a、13b的發光管11的內表面， G 而與薄膜20接觸的部分的電位，是藉由流著Rb、Ra的 電流，使得接觸於薄膜20的發光管11的靜電容量Cg被 充電而會時間變化，惟Rb是高電阻之故，因而該時間變 化是與燈的施加電壓的周期變化還要緩和。薄膜20的前 端部分的電位是與放電空間19所接觸的部分的電位相同 ，而薄膜20的導電性物質側的電位，是與導電性物質16 接觸的部分的電位相同，而其間的電位分布是具有緩和的 傾斜。 如第8(b)圖、第8(c)圖所示地，重疊於外部電 -11 - 200947503 極13a、外部電極13b的發光管11的內表面的電位分布 ，是在薄膜20的領域成爲緩和地傾斜，而不會發生如在 第7圖的境界部分的強電場。藉此，成爲不容易發生放電 的起點，而會產生起動電壓的上昇者。 藉由本發明，一種稀有氣體螢光燈，是具備：在內部 封入有稀有氣體的直管狀而管徑爲6.2〜12mm的玻璃製 發光管，及形成於該發光管的內面的螢光體層，及在發光 管的外周在周方向隔離且朝管軸方向延伸的方式全面配設 於發光管的大約全長的一對電極，而在發光管內面的端部 領域，沿著發光管的內周，帶狀地配設導電性物質的稀有 氣體螢光燈，具有將發光管內面的導電性物質的帶狀配設 領域的管軸方向的至少一方的境界線在發光管外面上交叉 有電極的交叉電極部，將該交叉電極部的電極寬W，與經 由電極與發光管交叉的導電性物質的管軸方向的寬度D 之關係作成D20.5，且 DxO.5SWSFxO.65，藉此，即使 在發光管內面作成形成有導電性物質的薄膜，可提供長時 間地全面可抑制起動電壓的上昇的稀有氣體螢光燈。 還有，將電極的寬度作成從發光管的一方的端一直到 位於另一方的端的導電性物質近旁爲止大約一樣的寬度， 而將發光管內面的導電性物質的帶狀配設領域的管軸方向 的至少一方的境界線在發光管外面上交叉有電極的交叉電 極部的電極的寬度作成比大約一樣的寬度還要寬，則提高 抑制長時間地全面上昇起動電壓的上昇的效果，在液晶背 面光等的照明用途上，一面極力減少遮住被放出至電極配 -12- 200947503 設所致的發光管外部的光的遮光部，一面成爲可得到長時 間地全面抑制起動電壓的上昇的效果的構成。 又，藉由本發明，在不變更管軸方向的配光分布下， 可降低起動電壓。 還有，藉由導電性糊來形成電極，即使作成超過如 lm的長螢光燈時，也可容易地實現發光管的端部僅增大 電極寬，而其他部分是將電極寬作成細小的情形。 以ITO膜另外形成電極的寬廣部分，而ITO膜是具 透光性，即使在該寬廣的交叉電極中也可有效地利用光。 【實施方式】 使用圖式來說明本發明的實施形態。第1圖是表示本 發明的稀有氣體螢光燈10的全體圖及以垂直於管軸的面 切剖的斷面圖。第1(b)圖是表示橫過以第1(a)圖中 的A-A線所表示的部位的發光管端部領域的內部導電性 〇 物質帶的斷面，第1(c)圖是表示橫過第1(a)圖中的 B-B線所表示的部位的發光管中央部的斷面。 本發明的稀有氣體螢光燈10是在發光管內面具備螢 光體層12，而在發光管11外表面朝發光管11的軸方向 形成外部電極13a、13b，而在發光管11內主要封入氣氣 所成的稀有氣體所成。在對應於外部電極1 3 a、1 3 b的配 設部分之間的發光管端部的內面領域中，沿著發光管11 內周，帶狀地配設導電性物質16。在該實施形態中，外 部電極的電極的寬度是從發光管的一端，一直到位於另一 -13- 200947503 方的端的導電性物質近旁爲止具一樣的寬度，而將發光管 內面的導電性物質的帶狀配設領域的管軸方向的至少一方 的境界線在發光管外面上交叉的電極部分，作成比發光管 周方向的寬度大約一樣的寬度部分的電極的寬度還要寬° 將導電性物質16的境界線在發光管外面上交叉的交 叉電極部17的周方向的寬度作爲W( mm)，而將導電性 物質的寬度作爲D( mm)，將發光管的外徑作成F( mm )時，採取6.2SFS12而滿足D20.5，且Dx0.5彡WSF x〇.65的關係的構成。 在第2圖表示本發明的實施形態。第2(a)圖是表 示典型例，將發光管11內面的導電性物質16在發光管外 面交叉而形成有交叉電極部17的狀態。外部電極13是燒 成導電糊所成。第2(b)圖、第2(c)圖是表示其變形 例，而第2(b)圖是表示交叉電極部17僅與導電性物質 16的靠近發光管11的中央的境界線重疊的領域將電極寬 作成較寬的形態。第2(c)圖是表示將交叉電極部17與 發光管1 1的大約全長全面地所配設的電極以例如ITO膜 等的其他構成所構成時的例子。 外部電極13a、13b是由銀糊所燒成，藉由網印所形 成，在大氣中例如在500°C燒成下烘漆所使用。又，在依 銀糊所形成者，例如對於1mm的電極寬產生±0.2mm的誤 差，惟成爲大約一樣的寬度。發光管11內面的導電性物 質16是發光管11端部被開放的狀態下藉由分配器塗佈於 管內面，例如在450〜500°C被烘漆形成。 200947503 又，將保護外部電極表面的情形作爲主要目的，被覆 燒成電極保護膜14a、14b而密接於發光管Π的玻璃表面 。對於外部電極13a、13b的電力供應，是在燈的一邊側 藉由導電性接著劑（未圖示）接著金屬端子18a、18b， 藉由將此以熱收縮管（未圖示）以形成饋電部。 又，發光管11的材質是可使用鈉鈣玻璃、鋁矽酸玻 璃、硼矽酸玻璃玻璃等。在外部電極13a、13b與導線 φ 15a、15b之連接，藉由銀糊進行接著，在其外周的配置 熱收縮管並予以加熱而被壓縮、擠壓進行固定，或是可用 焊接等直接進行接合。 (實施例） 以下，針對於本案發明的稀有氣體螢光燈10的構成 使用第1圖來說明具體性數値例及材料加以說明。發光管 11是由鈉鈣玻璃所構成，管外徑等的規格是如下所述。 〇 管外徑是 Φ 6.2〜φ 12mm之間，列舉一例爲9.8mm，其 厚度是0.34〜1.0mm，例舉一例爲〇.4mm。管全長是100 〜150mm，列舉一例爲lm。外部電極13a、13b的寬度是 0· 5〜2mm，列舉一例爲 0.5mm。作爲外部電極的材質適 用銀糊。電極厚度是3〜30ym，列舉一例爲l〇/zm。藉 由銀糊構成外部電極時，則藉由網印所形成在大氣中以 600 °C燒成而進行烘漆加以使用。又，爲了防止外部電極 的氧化及剝離具備被覆的電極保護膜14。針對於電極保 護膜1 4如下所述。 -15- 200947503 作爲電極保護膜14使用著以氧化鉍Bi203、氧化鈦 Ti〇2、氧化鋅ZnO、氧化硼B2〇3、氧化銦ιη2〇3等作爲主 成分的陶瓷粉末糊，而電極保護膜的厚度是5〜30/zm。 例舉一例爲15/zm。在此’電極保護膜14是除了外部電 極13a、13b與導線15a、15b之連接部以外，還被覆外部 電極全體。由陶瓷粉末糊形成電極保護膜14時，與外部 電極13a、13b時相同’藉由網印所形成，而在大氣中以 6〇〇°C燒成而烘漆被使用。又，若在不太高溫下使用的用 υ 途上，電極保護膜14是也可使用例如環氧系樹脂或聚矽 氧系樹脂等。 螢光體層12的螢光體材料是如下所述。藍色螢光體 是使用BaMgAl1G017: Eu，綠色螢光體是使用LaP〇4: Ce ，Tb、紅色發光體是使用（Y，Gd) B〇3: Eu或Y203:BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rare gas fluorescent lamp used for backlighting, illumination, and the like of a liquid crystal display device. [Prior Art] As a back light of a liquid crystal display device represented by a liquid crystal television, it is reviewed that a straight tubular light-emitting tube in which a rare gas is sealed inside, a phosphor layer formed on the inner surface of the light-emitting tube, and The outer surface of the arc tube is disposed in a circumferential direction and extends in the tube axis direction so as to be entirely disposed of a rare gas fluorescent lamp of a pair of electrodes of the entire length of the arc tube. The rare gas fluorescent lamp is a product having a low environmental load such as a low-pressure mercury lamp that does not contain mercury, and has a short rise time of light emission at a low temperature. Patent Document 1 discloses a backlight device in which an external electrode type rare gas fluorescent lamp is used for back light of a liquid crystal.稀 The rare gas fluorescent lamp is a light source for reading that is widely used as a reading medium for 〇A use, and has, for example, an aluminum foil having an outer peripheral adhesion width of 8 mm, which is isolated from a straight tubular light-emitting tube having a length of about 30 cm, or is formed. The external electrode coated with the conductive paste comprehensively illuminates approximately the entire length of the tube. Further, a part of the inner surface of the arc tube is provided with an aperture portion to which the phosphor is not applied, and the directivity light emitted from the aperture portion is used. The rare gas fluorescent lamp is provided with a conductive material on the inner surface of the arc tube in order to improve its startability. Patent Document 2 and Patent Document 3 disclose a rare gas fluorescent lamp in which a conductive substance is disposed on the inner surface of a fluorescent tube. Fig. 4 is a schematic perspective view showing a conventional external electrode type rare gas fluorescent lamp -5-200947503. A pair of electrodes 2a and 2b are disposed on the outer peripheral surface of the rare gas fluorescent lamp 1, and a conductive material 3 is disposed on the inner surface of the arc tube corresponding to the electrode. 4 is a voltage applied between the electrodes 2a and 2b. Frequency power supply. Patent Document 2: JP-A-2007-213893 (Patent Document 2) Japanese Laid-Open Patent Publication No. Hei No. Hei. In the case of the back light of the screen display, it is not necessary to carry out the light emission type of the rare-earth fluorescent lamp having a directivity from the aperture used in the conventional use, but it is necessary to emit light from the entire circumference of the arc tube. A rare gas fluorescent lamp in which the fluorescent material is approximately uniformly coated on the inner circumference of the arc tube is formed. Further, the width of the electrode is for increasing the light-receiving area, and is made, for example, as 0·5 to 1 ❹ mm as compared with the rare gas fluorescent lamp used in the conventional ΟΑ application. The conductive material on the inner surface of the arc tube is disposed to be provided on the inner surface portion corresponding to the outer surface portion of the arc tube on which the electrode is formed. The inventors of the present invention produced five rare gas fluorescent lamps having a total length of 1000 mm, a tube diameter of 9.8 mm, an electrode width of 0.5 mm in total length, and a width of the inner surface conductive material of 3.0 mm, and performing a lighting test. Hours, it was found that the starting voltage was slowly raised for all five lamps during the process. When used for backlighting of a liquid crystal display device, for example, a 46-inch -6 - 200947503 screen is used as a rare gas fluorescent lamp. In this application, the conventional cold cathode fluorescent lamp is required to have a life guarantee of 60,000 hours, but the same long life is required for the rare gas fluorescent lamp, and thus the starting voltage is deviated during long time lighting. At the same time, when the starting voltage rises slowly, there is a possibility that the lamp of the lighting and the lamp of the unlit lamp are mixed, and a bright inconvenience is generated on the liquid crystal screen. Further, an object of the present invention is to provide a rare gas fluorescent lamp in which a Q-light is performed for a long time even if it is more than 10,000 hours, and the rise of the starting voltage is small. In order to solve the above-mentioned problem, the rare gas fluorescent lamp includes a straight tubular glass light-emitting tube in which a rare gas is sealed inside, and is formed on the inner surface of the light-emitting tube. a phosphor lamp layer, and a rare gas fluorescent lamp integrally disposed on a pair of electrodes of the entire length of the light-emitting tube so as to be spaced apart in the circumferential direction and extending in the tube axis direction, and is characterized in that: In the end portion of the inner surface of the light-emitting tube in the arrangement portion of the electrode, a conductive material is disposed in a strip shape along the inner circumference of the light-emitting tube, and the conductive material on the inner surface of the light-emitting tube is present. At least one boundary line of the tube axis direction of the strip-shaped arrangement region intersects the intersection electrode portion of the electrode on the outer surface of the arc tube, and the electrode width of the intersection electrode portion is w (mm), and the outer surface of the arc tube is The width of the conductive material intersecting the electrode in the tube axis direction is D (mm), and when the outer diameter of the arc tube is F (mm), it is 6.2 SFS12, and satisfies D2 0.5 and DxO.5 SWSFxO.65 Relationship. According to the invention of claim 2, the width of the electrode is about the same width from one end of the arc tube to the vicinity of the conductive material of the other end of the conduction layer 200947503, and the cross electrode portion The width of the electrode is made wider than about the same width as described above. According to the invention of claim 3, the electrode is formed by firing a conductive paste. According to the invention of claim 4, the electrode of the intersecting electrode portion is formed of a member different from the electrode of the other portion. The invention described in claim 5 is that the above different members are used as the ITO film. © The external electrode type rare gas in which the conductive material is placed on the inner surface of the arc tube. In the case of the fluorescent lamp, the result of the gradual increase in the starting voltage for a long time is estimated to be the following. Fig. 5 is a view showing the relative positional relationship between the external electrode and the conductive material on the inner surface of the arc tube. The outline of the external electrode 13 is indicated by a broken line, and the outline of the conductive substance 16 is indicated by a solid line. The illustration is omitted for the light-emitting tube. As shown by the oblique line in FIG. 5, the cross-electrode portion 17 in which the conductive material 16 and the external-electrode electrode 13 intersected in the vicinity of the conductive material of the lamp having the rising starting voltage was visually observed, and it was confirmed along the intersecting electrode portion 17 The outline of the outer electrode 13 in the outline direction of the tube axis direction, and a part of the inner surface of the arc tube is thinly colored. This is a sputtering phenomenon caused by discharge of a barrier between the external electrode 13 and the conductive material 16 via the glass in the arc tube, for example, a conductive substance 16 such as a carbon paste is scattered, which may become the film 20 Attached to the inner surface of the tube. Further, the rise of the starting voltage is a cause of the film 20. The reason is explained below. In the seventh (a) diagram, the rare gas fluorescent lamp 10 at the stage of the -8-200947503 film in which the conductive material 16 is not produced is shown in the vicinity of the conductive material 16. The external electrode 13a and the external electrode 13b are disposed to face each other outside the light-emitting tube 11. The conductive material 16 is a part of a portion of the arc tube glass that is disposed so as to overlap the external electrodes 13a and 13b on the inner surface of the short-circuiting light-emitting tube. Moreover, the electrostatic capacitance in the vicinity of the unit area of the arc tube glass superposed on the external electrodes 13a and 13b is Cg, and the unit area of the discharge space 19 of the surface of the arc tube superposed on the external electrodes 13a and 13b is 0. The electrostatic capacity is Cd, and the electric resistance of the conductive material 16 sandwiched between the inner surfaces of the arc tubes superposed on the external electrode 13 is Ra. Fig. 7(b) shows the potential distribution of the inner surface of the arc tube 11 superimposed on the outer electrode 13a, and Fig. 7(c) shows the potential distribution of the inner surface of the arc tube 11 superposed on the outer electrode 13b. The potential of the external electrode 13a is Va, and the potential of the external electrode 13b is 0, and the inside of the arc tube is in a state where no discharge occurs. The φ potential of the portion of the inner surface of the arc tube 11 which is superposed on the outer electrodes 13a and 13b and which is in contact with the discharge space 19 is determined by the partial pressure of Cg and Cd. The size of Cd is generally 1/100 or less of Cg, and thus the voltage is almost concentrated on Cd. Therefore, the potential of the portion which is in contact with the discharge space 19 on the inner surface of the arc tube 11 which is superposed on the outer electrode 13a is approximately Va, and is in contact with the discharge space 19 on the inner surface of the arc tube which is superposed on the outer electrode 13b. Part of the potential is about 〇. The potential of the portion in contact with the conductive material 16 on the inner surface of the arc tube 11 which is superposed on the external electrodes 13a and 13b is divided by Cg and Ra. Ra is low resistance, so Cg is quickly charged to the size of Va/2 -9- 200947503. Therefore, the potential 'in the portion of the inner surface of the arc tube 11 which is superposed on the outer electrode 13a and the outer electrode 13b and which is in contact with the conductive material 16 is Va/2. In the seventh (b) and seventh (c), the potential distribution of the inner surface of the arc tube 11 superposed on the outer electrode 13a and the outer electrode 13b is in the direction of the tube axis direction of the conductive material 16 As the boundary changes drastically, a strong electric field is generated in this boundary portion. In this way, the discharge which is the starting point is generated, and the start can be surely performed. Fig. 8(a) shows an isotropic circuit in the vicinity of the conductive material 16 for the rare gas fluorescent lamp 1 of the film @20 in which the conductive material 16 is generated. The external electrode 13a and the external electrode 13b are disposed to face each other outside the arc tube 11. The conductive material 16 is a part of a portion of the external electrode 13b which is disposed so as to be short-circuited to the inner surface 13a' of the inner surface of the arc tube 11. The film 20 is attached to the axial direction from the boundary portion of the conductive material 16 in the tube axis direction by a length of several mm to several tens of mm. Further, the electrostatic capacitance per unit area of the arc tube glass superposed on the external electrodes 13a and 13b is Cg, and each unit of the discharge ◎ space 19 sandwiched between the inner surfaces of the arc tubes 11 superposed on the external electrodes 13a and 13b. As the Cd, the electric resistance of the conductive material 16 sandwiched between the inner surfaces of the arc tubes 11 superposed on the external electrodes 13a and 13b is Ra, and the electric resistance per unit length of the film 20 is referred to as Rb. The eighth (b) diagram shows the potential distribution of the inner surface of the arc tube 11 superimposed on the outer electrode 13a, and the eighth (c) diagram shows the potential distribution of the inner surface of the arc tube 11 superposed on the outer electrode 13b. The potential of the external electrode 13a is taken as Va, and the potential of the external electrode 13b is taken as 〇-10-200947503 as a state in which no discharge occurs in the inside of the arc tube. The potential of the portion of the inner surface of the arc tube 11 which is superposed on the outer electrodes 13a and 13b and which is in contact with the discharge space 19 is determined by the partial pressure of Cg and Cd. The size of Cd is generally 1/100 or less of Cg, and thus the voltage is almost concentrated in Cd. Therefore, the potential of the portion in contact with the discharge space 19 on the inner surface of the arc tube 11 overlapped with the external electrode 13a becomes approximately Va, and the inner surface of the arc tube 11 overlapped with the external electrode 13b and the discharge H space 19 The potential of the contact portion is about 0. The potential of the portion of the light-emitting tube 11 which is superposed on the external electrodes 13a and 13b and the portion of the conductive material 16 is determined by the partial pressure of Cg and Ra. Ra is low resistance, so Cg is quickly charged to a size of Va /2. Therefore, the potential of the portion in contact with the conductive material 16 on the inner surface of the arc tube 1 1 which is superposed on the external electrode 13a and the external electrode 13b is Va/2. The potential of the portion of the inner surface of the arc tube 11 which is superposed on the outer electrodes 13a and 13b, G, and the film 20 is the electrostatic capacitance of the arc tube 11 which is in contact with the film 20 by the current flowing through Rb and Ra. Cg is charged and changes in time, but Rb is high resistance, so the time variation is moderated with the periodic variation of the applied voltage of the lamp. The potential of the front end portion of the film 20 is the same as the potential of the portion in contact with the discharge space 19, and the potential of the conductive material side of the film 20 is the same as the potential of the portion in contact with the conductive material 16, and the potential distribution therebetween is Has a gentle tilt. As shown in Fig. 8(b) and Fig. 8(c), the potential distribution of the inner surface of the arc tube 11 which is superimposed on the external electric -11 - 200947503 pole 13a and the external electrode 13b is in the field of the film 20. Tilting gently, without a strong electric field as in the boundary of Figure 7. As a result, the starting point of the discharge is less likely to occur, and the rise of the starting voltage is generated. According to the present invention, a rare gas fluorescent lamp includes a glass light-emitting tube having a straight tubular shape in which a rare gas is enclosed and having a diameter of 6.2 to 12 mm, and a phosphor layer formed on the inner surface of the light-emitting tube. And a pair of electrodes disposed substantially in the entire length of the arc tube in a manner of being separated in the circumferential direction and extending in the tube axis direction on the outer circumference of the arc tube, and in the end portion of the inner surface of the arc tube, along the inner circumference of the arc tube a rare gas fluorescent lamp in which a conductive material is disposed in a strip shape, and at least one boundary line of the tube axis direction of the conductive material in the inner surface of the light-emitting tube is intersected with an electrode on the outer surface of the light-emitting tube In the intersecting electrode portion, the relationship between the electrode width W of the intersecting electrode portion and the width D of the conductive material passing through the electrode and the arc tube in the tube axis direction is D20.5 and DxO.5SWSFxO.65. Even if a film in which a conductive material is formed is formed on the inner surface of the arc tube, a rare gas fluorescent lamp which can suppress an increase in the starting voltage over a long period of time can be provided. Further, the width of the electrode is approximately the same width from the one end of the arc tube to the vicinity of the conductive material at the other end, and the tube of the conductive material in the inner surface of the arc tube is disposed in the band-like arrangement. In the boundary line of at least one of the axial directions, the width of the electrode intersecting the electrode portion intersecting the electrode on the outer surface of the arc tube is wider than approximately the same width, thereby improving the effect of suppressing an increase in the starting voltage of the full-scale rise over a long period of time. In the illumination application such as the backlight of the liquid crystal, the light-shielding portion that blocks the light emitted to the outside of the arc tube due to the electrode arrangement -12-200947503 is reduced as much as possible, and the increase in the starting voltage can be suppressed for a long period of time. The composition of the effect. Moreover, according to the present invention, the starting voltage can be lowered without changing the light distribution in the tube axis direction. Further, when the electrode is formed by the conductive paste, even when a long fluorescent lamp such as lm is formed, the end portion of the arc tube can be easily increased only by increasing the electrode width, and the other portion is made to be small in width. situation. The ITO film additionally forms a wide portion of the electrode, and the ITO film is light transmissive, and light can be effectively utilized even in the wide cross electrode. [Embodiment] An embodiment of the present invention will be described using a drawing. Fig. 1 is a general view showing a rare gas fluorescent lamp 10 according to the present invention, and a cross-sectional view taken along a plane perpendicular to the tube axis. Fig. 1(b) is a cross-sectional view showing the inner conductive germanium material band in the field of the end portion of the arc tube across the portion indicated by the line AA in Fig. 1(a), and Fig. 1(c) is a view showing Cross section of the central portion of the arc tube at a portion indicated by the line BB in the first graph (a). In the rare gas fluorescent lamp 10 of the present invention, the phosphor layer 12 is provided on the inner surface of the arc tube, and the outer electrodes 13a and 13b are formed on the outer surface of the arc tube 11 in the axial direction of the arc tube 11, and are mainly enclosed in the arc tube 11. A rare gas formed by gas. In the inner surface area of the end portion of the arc tube between the arrangement portions corresponding to the external electrodes 1 3 a and 1 3 b, the conductive material 16 is disposed in a strip shape along the inner circumference of the arc tube 11. In this embodiment, the width of the electrode of the external electrode is the same width from one end of the arc tube to the vicinity of the conductive material at the other end of the -13-200947503, and the conductivity of the inner surface of the arc tube is obtained. The electrode portion at least one of the boundary lines in the tube axis direction of the material in the band-shaped arrangement area is formed on the outer surface of the arc tube to have a width wider than the width of the arc tube in the circumferential direction. The boundary line of the boundary material of the substance 16 on the outer surface of the arc tube is W (mm) in the circumferential direction, and the width of the conductive material is taken as D (mm), and the outer diameter of the arc tube is made F ( In the case of mm), 6.2 SFS12 is adopted to satisfy the relationship of D20.5 and Dx0.5彡WSF x〇.65. Fig. 2 shows an embodiment of the present invention. Fig. 2(a) is a view showing a typical example in which the conductive material 16 on the inner surface of the arc tube 11 is crossed on the outer surface of the arc tube to form the intersecting electrode portion 17. The external electrode 13 is formed by firing a conductive paste. Figs. 2(b) and 2(c) show a modification thereof, and Fig. 2(b) shows that the intersecting electrode portion 17 overlaps only the boundary line of the conductive material 16 near the center of the arc tube 11. The field makes the electrode width wider. Fig. 2(c) is a view showing an example in which the electrodes disposed integrally with the cross-electrode portion 17 and the entire length of the arc tube 1 are formed of other structures such as an ITO film. The external electrodes 13a and 13b are fired from a silver paste and formed by screen printing, and are baked in the air at, for example, 500 ° C. Further, in the case where the silver paste is formed, for example, an error of ±0.2 mm is generated for the electrode width of 1 mm, but it is about the same width. The conductive material 16 on the inner surface of the arc tube 11 is coated on the inner surface of the tube by a dispenser in a state where the end portion of the arc tube 11 is opened, for example, baked at 450 to 500 °C. In addition, as a main purpose of protecting the surface of the external electrode, the electrode protective films 14a and 14b are baked and adhered to the glass surface of the light-emitting tube. The power supply to the external electrodes 13a and 13b is performed by a conductive adhesive (not shown) on the one side of the lamp, followed by the metal terminals 18a and 18b, and the heat-shrinkable tube (not shown) is used to form a feed. Ministry of Electricity. Further, as the material of the arc tube 11, soda lime glass, aluminosilicate glass, or borosilicate glass glass can be used. The external electrodes 13a and 13b are connected to the wires φ 15a and 15b, and then the silver paste is applied, and the heat shrinkable tube is placed on the outer periphery thereof, heated, compressed, pressed, or directly joined by welding or the like. . (Embodiment) Hereinafter, the configuration of the rare gas fluorescent lamp 10 of the present invention will be described with reference to the first embodiment. The arc tube 11 is made of soda lime glass, and the specifications of the tube outer diameter and the like are as follows. The outer diameter of the crucible tube is between Φ 6.2 and φ 12 mm, and an example is 9.8 mm, and the thickness thereof is 0.34 to 1.0 mm, and an example is 〇.4 mm. The total length of the tube is 100 to 150 mm, and an example is lm. The width of the external electrodes 13a and 13b is 0·5 to 2 mm, and an example is 0.5 mm. A silver paste is used as the material of the external electrode. The thickness of the electrode is 3 to 30 μm, and an example is l〇/zm. When the external electrode is formed of a silver paste, it is baked by baking at 600 °C in the atmosphere by screen printing. Further, the electrode protective film 14 is covered in order to prevent oxidation and peeling of the external electrode. The electrode protective film 14 is as follows. -15- 200947503 As the electrode protective film 14, a ceramic powder paste containing ruthenium oxide Bi203, titanium oxide Ti〇2, zinc oxide ZnO, boron oxide B2〇3, indium oxide iηη〇3 or the like as a main component is used, and the electrode protective film is used. The thickness is 5~30/zm. An example is 15/zm. Here, the electrode protective film 14 is covered with the entire external electrode except for the connection portions of the external electrodes 13a and 13b and the wires 15a and 15b. When the electrode protective film 14 is formed of a ceramic powder paste, it is formed by screen printing in the same manner as in the case of the external electrodes 13a and 13b, and is baked at 6 ° C in the atmosphere to be used as a baking varnish. Further, the electrode protective film 14 may be, for example, an epoxy resin or a polyoxygen resin, if it is used at a temperature which is not used at a high temperature. The phosphor material of the phosphor layer 12 is as follows. The blue phosphor is BaMgAl1G017: Eu, the green phosphor is LaP〇4: Ce, Tb, and the red emitter is (Y, Gd) B〇3: Eu or Y203:
Eu。又，螢光體是並不被限定者。螢光體的色度調整：以 (X、y) = (0.31、0.35)附近作爲基本，惟藉由用途在 螢光體可再現的範圍內變更螢光體的配合比，則可自由自 © 在地變更。螢光體平均膜厚是10〜12#m。列舉一例爲 15//m。又，在塗佈導電性物質的發光管端部領域中，在 導電性物質塗佈部分未塗佈螢光體。在未塗佈螢光體的部 位而在封閉發光管之前，從發光管外部藉由分配器進行注 入塗佈碳糊，經燒成以形成導電性物質的帶狀部。 封入氣體壓與氣體種類是如下所述。封入氣體壓是， 4xl03〜40xl03Pa，而作爲氣體種類是Xe。列舉一例爲 21 kPa。在外部電極13a、13b與導線15a、15b之連接， -16- 200947503 有藉由銀糊進行接著，而將熱收縮管（未圖示）配置於其 外周而施以加熱，進行壓縮、推壓加以固定，或是以焊接 等可進行直接接合。 以下說明確認本發明的效果的實驗。在被使用於液晶 顯示裝置等的背面光源的外部電極型的稀有氣體螢光燈中 ，燈的管徑是被使用 Φ6.2〜Φ12.0者，惟任何管徑中， 電極間的沿面距離是爲了保持絕緣也必須爲一定以上的大 0 小。該沿面距離的大小是200V/ mm ( JIS規格）使用作 爲標準，而最小沿面距離是作爲（最大電壓/ 200) mm。 因此，最大電極寬是成爲{(發光管外周的大小）一（最 小沿面距離）x2} +2。第 9圖是表示針對於 φ 6.2〜 φ 12.0的範圍的幾種管徑，而對外周的大小、最大電壓、 最小沿面距離、最大電極寬、最大電極寬/管徑者。最大 電壓是依實測者。依照第9圖，可知管徑與最大電極寬是 在大約比例關係。（最大電極寬/管徑）的大小，是在任 〇 一管徑都大約相同，爲6 5〜7 0 %的大小。在本發明中，將 電極寬作成管徑的6 5 %以下，就可保持外部電極間的絕緣 〇 當初，以導電性物質寬3.0mm、電極寬0.5mm的條 件下進行試驗，觀看到起動電壓徐徐地上昇的現象。在此 ’以導電性物質寬作爲1.0、2.0、3.0、4.0mm，而以電極 寬作爲 0.5mm、1.0mm、1 .5mm、2.0mm作爲組合而進行 比較試驗。在各個組合準備16種類，分別準備各5支， 每一燈長度lm以約20W電力進行連續點燈，進行i 1000 -17- 200947503 小時的點燈試驗，來調査起動電壓的變化。燈的規格是全 長lm、管徑9.8mm，而外部電極的材質是銀糊，封入氣 體爲Xe，而壓力是21 kP a，內部導電性物質是碳糊。 其結果是得到如第10圖的結果》 依第1〇圖，電極寬是大，又，導電性物質的寬度是 小者，則在抑制起動電壓的上昇有良好的趨勢，而在交叉 電極部的電極寬W2導電性物質寬Dx 1/2的條件下進行 設計，則有防止起動電壓上昇的結果。觀察使用於實驗的 燈，則在導電性物質與電極重疊部分的境界線附近，可看 到導電性物質被濺鍍的形跡。如第5圖所示地，起動電壓 上昇的燈，是有依該濺鍍的飛散物的薄膜堵住境界部分的 形式附著的趨勢。該濺鍍薄膜堵住境界部分而會產生起動 電壓上昇的可能。其理由是如上所述。一方面，濺鍍薄膜 的量，是導電性物質的寬愈小的燈有愈少的趨勢。 有關於電極寬大，或是導電性物質的寬度小所致的起 動電壓上昇的抑制效果可能有如下。 電極寬大，亦即，爲導電性物質與電極所重疊的部分 的境界線的長度愈長的情形，第6圖是表示電極與發光管 內面的導電性物質的相對性位置關係的圖式，惟如第6圖 所示地，即使產生濺鍍薄膜，則堵住境界全體的可能性也 變低，而有抑制起動電壓上昇的可能。 導電性物質的寬度小，亦即外部電極與導電性物質之 間的靜電容量小的情形。靜電容量小，則在導電性物質與 電極所重疊的部分的境界所發生的放電的放電電流會變小 -18- 200947503 而使得經濺鍍所飛散的導電性物質的飛散量變少，有抑制 起動電壓上昇的情形。 表示於第10圖者中，針對於3個條件作詳細表示實 驗結果者爲第3圖。第3(a)圖是表示將交叉電極部的 電極寬W作爲0.5mm，而將導電性物質寬D作爲3.0mm 時的資料，第3(b)圖是表示將交叉電極部的電極寬W 作爲0.5 mm，而將導電性物質寬D作爲1.0mm時的資料 H ，第3(C)圖是表示將交叉電極部的電極寬 W作爲 2.0 mm，而將導電性物質寬D作爲3.0 mm時的資料。 與內部導電性物質的管軸方向的寬D爲3.0mm相比 較，在將外部電極的交叉電極部的寬度W作成其1/6的 0.5mm的第3(a)圖中，點燈11000小+時後，起動電壓 是成爲上昇至初期的1.5〜1·6倍。一方面，將外部電極 的交叉電極部W的寬度對於內部導電性物質的管軸方向 的寬度作成其一半以上的第3(b)圖、第3(c)圖的情 ❹ 形，則經過1 1000小時之後，稀有氣體螢光燈的起動電壓 的電壓上昇也被抑制。 如上所述地，起動電壓的上昇是以電極寬導電性 物質寬Dxl/2的條件可防止，又，如上述地由於有電極 寬WS管徑FxO.65的關係，導電性物質寬D的上限是成 爲導電性物質寬DS管徑Fxl.3。又，導電性物質寬的下 限是0.5mm。在不足該〇.5mm，則有所形成的導電性物質 寬的偏差之故，因而成爲急劇地很難確保穩定的高導電性 "19- 200947503 【圖式簡單說明】 第1(a)圖至第1(c)圖是表示本發明的實施形態 的稀有氣體螢光燈的全體圖及斷面圖。 第2(a)圖至第2(c)圖是表示在本發明的實施形 態中’外部電極與發光管內的導電性物質的位置關係的例 子的模式圖。 第3(a)圖至第3(c)圖是表示本發明的效果的實 @ 驗結果的圖式。 第4圖是表示習知的稀有氣體螢光燈的全體圖。 第5圖是表示電極與發光管內面的導電性物質的相對 性位置關係的圖式。 第6圖是表示電極與發光管內面的導電性物質的相對 性位置關係的圖式。 第7(a)圖至第7(c)圖是表示針對於未產生導電 性物質的薄膜的階段的稀有氣體螢光燈、導電性物質附近 〇 的等値電路。 第8(a)圖至第8(c)圖是表示針對於有導電性物 質的薄膜產生的稀有氣體螢光燈、導電性物質附近的等値 電路。 第9圖是表示外部電極型的稀有氣體螢光燈的各種尺 寸。 第10圖是表示確認本發明的效果的試驗結果。 -20- 200947503 【主要元件符號說明】 1 :稀有氣體螢光燈 2 a、2 b :電極 3 :導電性物質 4 :高頻電源 1 〇 :稀有氣體螢光燈 1 1 :發光管Eu. Also, the phosphor is not limited. The chromaticity adjustment of the phosphor is based on the vicinity of (X, y) = (0.31, 0.35), but the blending ratio of the phosphor can be changed within the range in which the phosphor can be reproduced by use. Changed locally. The average film thickness of the phosphor is 10 to 12 #m. An example is 15/m. Further, in the field of the end portion of the arc tube to which the conductive material is applied, the phosphor is not coated on the portion coated with the conductive material. Before the light-emitting tube is uncoated, the carbon paste is injected from the outside of the arc tube by a dispenser and fired to form a strip portion of the conductive material. The enclosed gas pressure and gas type are as follows. The enclosed gas pressure is 4xl03 to 40xl03Pa, and the gas type is Xe. An example is 21 kPa. The external electrodes 13a and 13b are connected to the wires 15a and 15b, and the -16-200947503 is followed by a silver paste. The heat-shrinkable tube (not shown) is placed on the outer periphery thereof and heated to compress and press. It can be fixed or directly joined by welding or the like. An experiment for confirming the effects of the present invention will be described below. In the external electrode type rare gas fluorescent lamp used for the back surface light source of a liquid crystal display device or the like, the diameter of the lamp is Φ6.2 to Φ12.0, but the creepage distance between the electrodes in any of the tube diameters. In order to maintain insulation, it must be more than a certain size of 0. The creepage distance is 200V/mm (JIS size) and the minimum creepage distance is (maximum voltage / 200) mm. Therefore, the maximum electrode width is {(the size of the outer circumference of the arc tube) one (the minimum creeping distance) x2} +2. Fig. 9 is a graph showing the diameters of the outer circumference, the maximum voltage, the minimum creeping distance, the maximum electrode width, and the maximum electrode width/tube diameter for a range of φ 6.2 to φ 12.0. The maximum voltage is based on the actual measurement. According to Fig. 9, it can be seen that the tube diameter and the maximum electrode width are in a proportional relationship. The size of the (maximum electrode width / tube diameter) is approximately the same in any tube diameter, and is 6 5 to 70 %. In the present invention, when the electrode width is made 65% or less of the tube diameter, the insulation between the external electrodes can be maintained, and the test is performed under the conditions of a conductive material width of 3.0 mm and an electrode width of 0.5 mm, and the starting voltage is observed. The phenomenon of rising slowly. Here, the width of the conductive material was 1.0, 2.0, 3.0, and 4.0 mm, and the electrode width was 0.5 mm, 1.0 mm, 1.5 mm, and 2.0 mm as a combination. Sixteen types were prepared for each combination, and five each were prepared. Each lamp length lm was continuously lit with about 20 W of electric power, and a lighting test of i 1000 -17-200947503 hours was performed to investigate the change in the starting voltage. The lamp has a full length of lm and a diameter of 9.8 mm, while the outer electrode is made of silver paste, the sealed gas is Xe, and the pressure is 21 kP a. The internal conductive material is carbon paste. As a result, the result as shown in Fig. 10 is obtained. According to the first drawing, the electrode width is large, and if the width of the conductive material is small, there is a good tendency to suppress the rise of the starting voltage, and the cross electrode portion is in a good tendency. When the electrode width W2 conductive material is designed to have a width Dx 1/2, the starting voltage is prevented from rising. When the lamp used in the experiment was observed, a trace of the conductive material being sputtered was observed in the vicinity of the boundary line between the conductive material and the electrode. As shown in Fig. 5, the lamp whose starting voltage rises tends to adhere to the boundary portion of the spattered scattering material. The sputter film blocks the boundary portion and may cause a rise in the starting voltage. The reason is as described above. On the one hand, the amount of the sputtered film is such that the wider and smaller the conductive material has a smaller tendency. The effect of suppressing the rise of the starting voltage due to the large width of the electrode or the small width of the conductive material may be as follows. The electrode is wide, that is, the longer the length of the boundary line between the portion where the conductive material and the electrode overlap, and FIG. 6 is a view showing the relative positional relationship between the electrode and the conductive material on the inner surface of the arc tube. However, as shown in Fig. 6, even if a sputtering film is formed, the possibility of blocking the entire boundary is lowered, and there is a possibility that the starting voltage is suppressed from rising. The width of the conductive material is small, that is, the electrostatic capacitance between the external electrode and the conductive material is small. When the electrostatic capacitance is small, the discharge current of the discharge occurring at the boundary between the portion where the conductive material and the electrode overlap is small -18-200947503, and the amount of scattering of the conductive material scattered by the sputtering is reduced, and the start of suppression is suppressed. The situation in which the voltage rises. In the figure shown in Fig. 10, the result of the detailed analysis of the three conditions is shown in Fig. 3. Fig. 3(a) is a view showing a case where the electrode width W of the intersecting electrode portion is 0.5 mm and the conductive material width D is 3.0 mm, and Fig. 3(b) is a view showing the electrode width W of the intersecting electrode portion. When the conductive material width D is 0.5 mm, the data H when the conductive material width D is 1.0 mm, and the third (C) diagram shows that the electrode width W of the intersecting electrode portion is 2.0 mm, and the conductive material width D is 3.0 mm. data of. Compared with the width D of the internal conductive material in the tube axis direction of 3.0 mm, in the third (a) diagram in which the width W of the intersecting electrode portion of the external electrode is made 1/6 of 0.5 mm, the lighting is 11,000 small. After the + time, the starting voltage is increased to 1.5 to 1.6 times the initial period. On the other hand, when the width of the intersecting electrode portion W of the external electrode is half or more of the width of the inner conductive material in the tube axis direction, the shape of the third (b) and the third (c) is 1 After 1000 hours, the voltage rise of the starting voltage of the rare gas fluorescent lamp was also suppressed. As described above, the rise of the starting voltage can be prevented by the condition that the width of the electrode wide conductive material is Dxl/2, and the upper limit of the width D of the conductive material is as described above due to the relationship of the electrode width WS diameter FxO.65. It is a conductive material with a wide DS diameter Fxl.3. Further, the lower limit of the width of the conductive material is 0.5 mm. When the thickness is less than 5 mm, the width of the conductive material formed varies greatly, so that it is difficult to ensure stable high conductivity. "19-200947503 [Simple description of the drawing] Figure 1(a) FIG. 1(c) is a general view and a cross-sectional view showing a rare gas fluorescent lamp according to an embodiment of the present invention. Figs. 2(a) to 2(c) are schematic views showing an example of the positional relationship between the external electrode and the conductive material in the arc tube in the embodiment of the present invention. Figs. 3(a) to 3(c) are diagrams showing actual results of the effects of the present invention. Fig. 4 is a general view showing a conventional rare gas fluorescent lamp. Fig. 5 is a view showing the relative positional relationship between the electrode and the conductive material on the inner surface of the arc tube. Fig. 6 is a view showing the relative positional relationship between the electrode and the conductive material on the inner surface of the arc tube. Figs. 7(a) to 7(c) are diagrams showing a rare gas fluorescent lamp at the stage of a film in which a conductive material is not produced, and a tantalum circuit in the vicinity of a conductive material. Figs. 8(a) to 8(c) are diagrams showing a rare gas fluorescent lamp and a circuit in the vicinity of a conductive material for a film having a conductive material. Fig. 9 is a view showing various dimensions of an external electrode type rare gas fluorescent lamp. Fig. 10 is a view showing the results of tests for confirming the effects of the present invention. -20- 200947503 [Explanation of main component symbols] 1 : Rare gas fluorescent lamp 2 a, 2 b : Electrode 3 : Conductive substance 4 : High-frequency power supply 1 〇 : Rare gas fluorescent lamp 1 1 : Light-emitting tube
13、 13a、 13b:外部電極 14a、14b :電極保護膜 1 5 a、1 5 b :導線 1 6 :導電性物質 17 :交叉電極部 1 8a、1 8b :金屬離子 1 9 :放電空間 20 :薄膜13, 13a, 13b: external electrodes 14a, 14b: electrode protective film 1 5 a, 1 5 b: wire 16: conductive substance 17: intersecting electrode portion 18a, 18b: metal ion 19: discharge space 20: film
-21 --twenty one -