201042700 六、發明說明： 【發明所屬之技術領域】 本發明關於氣體放電燈，尤其關於一種在燈管內部設 置引導極的氣體放電燈。 【先前技術】 . 傳統的採用電感鎭流器的氣體放電燈例如日光燈，如 〇 圖1所示’主要由燈管Μ、起動器S、鎭流器L等組成。 當開關Κ閉合後，電源把電壓加在起動器的兩極之間，使 起動器內的氖氣放電而發出輝光。輝光產生的熱量使起動 器內的U型動觸片膨脹伸長與靜觸片接通，於是鎭流器線 圏和燈管的陰極就有電流通過。電流流通後，起動器中的 氖氣停止放電，U型動觸片冷卻收縮後與靜觸片分離，起 動器電路自動斷開。在起動器電路突然斷開的瞬間，由於 鎭流器電流急劇減小，產生很高的自感電動勢，形成一個 〇 暫態高壓加在燈管的兩端。燈管內的水銀蒸汽在高壓激發 後開始放電，於是使燈管內部成爲電流的通路開始發光。 曰光燈開始發光後，由於自感現象鎭流器的線圏中產生自 感電動勢阻礙電流的變化起到了降壓的作用，使燈管兩端 電壓維持在低電壓下滿足正常工作要求。 然而，上述氣體放電燈的起動過程由於是高壓起動， 屬於熱陰極起動，因此陰極的頻繁加熱容易使之受到損壞 ，縮短了放電燈的使用壽命。而且，起動器也是容易損壞 的部件，需要經常更換。 -5- 201042700 【發明內容】 本發明的目的在於克服現有技術的缺陷，提供一種長 壽命的內置引導極的氣體放電燈。 根據本發明的一個方面’提供一種氣體放電燈’包括 燈管，設置在燈管兩端的放電電極，以及連接在放電 電極與電源之間的鎭流器，該氣體放電燈還包括設置在燈 管內壁附近的內置引導極’該內置引導極的端部靠近該放 電電極。 如上所述的氣體放電燈，該內置引導極包括設置在該 內置引導極端部且與該放電電極相對的輔助極。 如上所述的氣體放電燈，該內置引導極的端部經由阻 抗元件連接到鎭流器回路。 如上所述的氣體放電燈，該內置引導極包括第一內置 引導極和第二內置引導極，該阻抗元件包括第一阻抗元件 和第二阻抗元件，該第一內置引導極的第一端部靠近該燈 管第一端的放電電極，該第一內置引導極的第二端部經由 第一阻抗元件連接到鎭流器回路；該第二內置引導極的第 一端部靠近該燈管第二端的放電電極，該第二內置引導極 的第二端部經由第二阻抗元件連接到鎭流器回路。 如上所述的氣體放電燈，該阻抗元件爲電容、電感和 電阻中的至少一個。 如上所述的氣體放電燈，該內置引導極的端部與該放 -6- 201042700 電電極之間的間距爲2至1 0 m m。 如上所述的氣體放電燈，該內置引導極的輔助極與該 放電電極之間的間距爲2至1 Omm。 如上所述的氣體放電燈，該氣體放電燈爲該燈管內壁 塗覆螢光粉的日光燈。 . 如上所述的氣體放電燈，該氣體放電燈爲該燈管內壁 _ 不塗覆螢光粉的紫外線燈、紅外線燈、高壓氣體放電燈或 〇 弧光燈。 如上所述的氣體放電燈，還包括設置成與燈管兩端的 放電電極相並聯的電容。 如上所述的氣體放電燈，該電容連接到放電電極之間 的連接線的至少一部分設置在燈管內部。 如上所述的氣體放電燈，設置在燈管內部的該連接線 外包玻璃。 根據本發明的氣體放電燈，由於採用了內置引導極， Ο 使得放電燈起動過程中，燈管兩端放電電極之間的放電電 流通路大大縮短，免去了暫態高壓放電的需要，變熱陰極 起動爲冷陰極起動，有效提高了放電燈的工作壽命。而且 ，放電燈免去了傳統的起動器，消除了因起動器損壞需頻 繁更換的缺陷，使得放電燈的日常維護更爲方便。 【實施方式】 圖2是表示根據本發明的一個實施例的氣體放電燈的 示意圖。參見圖2，燈管端部的放電電極e的兩根引出線 201042700 在燈管管端的管帽內已並接成短路，內置引導極p沿 Μ的內壁附近設置，其兩端端部分別靠近燈管兩端的 電極e。該引導極例如由鎳片、杜鎂絲、鉬、鎢或其 屬材料構成，兩個端部朝向放電電極例如有一個延伸 近後者設置，兩者之間的間距例如當電源電壓爲220 電源頻率爲50Hz或60Hz，放電燈內徑爲17mm左右 度爲1.2m左右時可以爲2至10mm，較佳的例如爲 5mm。引導極的本體例如用玻璃珠g固定在燈管內壁 當開關K閉合時，在燈管兩端的放電電極上加上電源 。兩端的放電電極暫態借助於引導極縮短了放電距離 一部分電流沿著引導極（具有分流作用）在燈管內部 。放電電極與引導極延伸段之間的持續放電，激發了 水銀蒸汽的放電，從而使氣體放電燈進入正常工作狀 根據該實施例的氣體放電燈，起動時無需在放電電極 加高電壓，從而可以在冷陰極起動的狀態下起動放電 亮。 圖3A是表示根據本發明另一個實施例的氣體放 的示意圖。參見圖3，燈管端部的放電電極e的兩根 線在燈管管端的管帽內已並接成短路，內置引導極P 管Μ的內壁設置，其兩端端部在靠近燈管放電電極e 置分別設置了輔助極a 1和a2。該輔助極例如用鎢絲 ，較佳地可以採用螺旋形狀。輔助極與放電電極之間 距例如當電源電壓爲220伏或110伏，電源頻率爲 或60Hz，放電燈內徑爲17mm左右、長度爲1.2m左 燈管 放電 他金 段靠 伏， 、長 3至 上。 電壓 ，使 流通 管內 態。 上施 燈點 電燈 引出 沿燈 的位 製成 的間 50Hz 右時 201042700 設置在2至l〇mm，較佳的爲3至5mm。引導極的本體例 如由燈管兩端的端部予以固定。與圖2所示實施例不同的 是，引導極的端部例如還穿出燈管端部並外接阻抗元件連 接到鎭流器回路。圖中所示的阻抗元件爲電容C 1和C2， 但阻抗元件並非局限於電容，也可以採用電感或電阻或其 - 組合。製作時，例如可以將阻抗元件封裝在燈管的管帽內 . 或者封裝在燈管管內，當考慮封裝在燈管管內時，例如也 〇 可以將放電氣體視作阻抗元件。這樣，採用本發明的內置 引導極的燈管就可以利用傳統的電路配置，直接安裝到燈 管管座上，無需對電路配置作任何變動。 圖3A中所示的內置引導極P，其兩端端部分別從燈 管的兩個端部引出。作爲一種變換，該內置引導極P也可 以僅使其中的一個端部從燈管的一端引出，這樣，阻抗元 件C1和C2僅需一個即可。作爲另一種變換，也可以省略 設置在引導極上的輔助極al或a2 (見圖3B)。 Ο 圖4是表币根據本發明的另一個實施例的氣體放電燈 的示意圖。參見圖4’與圖3所示不同的是，放電燈燈管 內設置了兩個內置引導極。其中，第一內置引導極P1的 第一端部上設置與第一放電電極el靠近的第一輔助極al ’第二內置引導極P2的第一端部上設置與第二放電電極 e2靠近的第二輔助極a2。輔助極&1和a2與放電電極el 和e 2之間的間距例如當電源電壓爲2 2 0伏，電源頻率爲 50Hz或60Hz’放電燈內徑爲17mm左右、長度爲i.2m& 右時分別爲2至l〇mm，較佳的爲3至5mm。第一內置引 201042700 導極pi的第二端經由第一阻抗元件連接到鎭流器 第二內置引導極P2的第二端經由第二阻抗元件連 流器回路。圖中所示的阻抗元件爲電容C1和C 2， 元件並非局限於電容，也可以採用電感或電阻或其 圖4所示的實施例由於採用了兩個內置引導極，從 使燈管的起動時間更快。 圖5是表示根據本發明的另一個實施例的氣體 的示意圖。參見圖5，與圖4所示不同的是，第一 導極P1的第一端部上設置的第一輔助極al是靠近 電電極e2設置，而第二內置引導極P2的第一端部 的第二輔助極a2是靠近第一放電電極el設置。這 根內置引導極就不用做得像圖4中的那樣長。 圖5所示的氣體放電燈採用了 U型燈管，本領 術人員可以理解，本發明的燈管不僅局限於直管和 管，而且適用於任何形狀的燈管。 圖6A是表示根據本發明的另一個實施例的氣 燈的示意圖。其中，在燈管端部的兩個放電電極e 聯連接一個阻抗元件（例如電容）Ca，它的作用是 燈開閉或遭遇外界干擾時用以吸收反電勢脈衝或其 信號的脈衝電流，防止脈衝電流對放電電極的破壞 防止脈衝電流對放電電極的濺射損害。圖6A中， 件Ca連接到放電電極e之間的連接線B是設置在 部的。 圖6B是表示根據本發明的另一個實施例的氣 回路， 接到鎭 但阻抗 組合。 而可以 放電燈 內置引 第二放 上設置 樣’兩 域的技 U型燈 體放電 之間並 當放電 他干擾 ，例如 阻抗元 燈管外 體放電 -10- 201042700 燈的示意圖。與圖6A所示不同的是’阻抗兀件Ca連接到 放電電極e之間的連接線B有一段是設置在燈管內部的。 作爲一種變換，設置在燈管內部的該連接線B例如外包玻 璃G ’以減小燈管內部例如氣體、雜質或溫度、放電電流 等對它的影響。 . 需要說明的是，圖6A和6B僅僅是兩個示意圖，在燈 管端部的兩個放電電極e之間並聯連接阻抗元件Ca的構 〇 思同樣適用於上述圖2、圖3A、圖4和圖5所示的方案及 其相應的變換。而且，例如圖6B所示的方案中，電容Ca 例如也可以設置在燈管端部例如外套金屬殼的燈頭內。而 且，連接線B例如不用延伸到燈管的外部’而直接可以連 接到燈頭內放電電極的端部上。 本發明的內置引導極的氣體放電燈的原理可以應用於 管內塗覆螢光粉的例如日光燈一類的放電燈’也可以應用 於管內不塗覆螢光粉的例如紫外線燈、紅外線燈、高壓氣 〇 體放電燈或弧光燈一類的放電燈。 以上所述是本發明的較佳實施例，根據本發明的構思 ，本領域的技術人員還可以對此作出各種變換和修改’但 這種變換和修改均屬於本發明的範圍。 【圖式簡單說明】 以下參照附圖和實施例對本發明的內置引導極的氣體 放電燈進行詳細描述。圖中相同的參照號均表示相同或相 似的元件或部件。本發明的上述和其他的目的、特點和效 -11 - 201042700 果在以下結合附圖的說明中將變得更爲明白。 圖1是表示傳統的氣體放電燈的起動過程的原理圖。 圖2是表示根據本發明的一個實施例的氣體放電燈的 示意圖。 圖3 A和3 B分別是表示根據本發明另外的實施例的氣 體放電燈的示意圖。 圖4是表示根據本發明的另一個實施例的氣體放電燈 的示意圖。 圖5是表示根據本發明的另一個實施例的氣體放電燈 的示意圖。 圖6 A和6 B分別是表示根據本發明另外的實施例的氣 體放電燈的示意圖。 【主要元件符號說明】 Μ :燈管 S :起動器 L ·’鎭流器 Κ :開關 e :放電電極 P :引導極 P1:第一內置引導極 P2 :第二內置引導極 a 1 :第一輔助極 a2 :第二輔助極 -12- 201042700 C 1, C2 :電容 e 1 :第一放電電極 e2 :第二放電電極 G :外包玻璃 B :連接線 . C a :阻抗元件（電容） g :玻璃珠 ❹201042700 VI. Description of the Invention: [Technical Field] The present invention relates to a gas discharge lamp, and more particularly to a gas discharge lamp in which a guide electrode is disposed inside a lamp tube. [Prior Art] A conventional gas discharge lamp using an inductive choke such as a fluorescent lamp, as shown in Fig. 1, is mainly composed of a lamp tube, a starter S, a choke L, and the like. When the switch Κ is closed, the power supply applies a voltage between the two poles of the starter to discharge the helium gas in the starter and emit a glow. The heat generated by the glow causes the U-shaped moving contact piece in the starter to expand and expand into contact with the static contact piece, so that current flows through the choke wire and the cathode of the lamp. After the current flows, the helium in the starter stops discharging, and the U-shaped moving contact is cooled and contracted, and then separated from the static contact piece, and the starter circuit is automatically disconnected. At the moment when the starter circuit is suddenly turned off, a high self-induced electromotive force is generated due to the sharp decrease of the current of the choke, and a transient high voltage is formed at both ends of the lamp. The mercury vapor in the tube starts to discharge after the high voltage is excited, so that the path inside the tube becomes a current and starts to emit light. After the neon light starts to emit light, the self-induced electromotive force in the coil of the self-inductance phenomenon hinders the change of the current and acts as a step-down, so that the voltage across the lamp tube is maintained at a low voltage to meet the normal working requirements. However, since the starting process of the above gas discharge lamp is a high voltage starting, it is a hot cathode starting, so frequent heating of the cathode is liable to be damaged, and the service life of the discharge lamp is shortened. Moreover, the starter is also a component that is easily damaged and needs to be replaced frequently. -5- 201042700 SUMMARY OF THE INVENTION An object of the present invention is to overcome the deficiencies of the prior art and to provide a long-life gas discharge lamp with a built-in guiding pole. According to an aspect of the invention there is provided a gas discharge lamp comprising a lamp tube, a discharge electrode disposed at both ends of the lamp tube, and a choke connected between the discharge electrode and the power source, the gas discharge lamp further comprising a lamp tube disposed at the lamp tube The built-in guiding pole near the inner wall 'the end of the built-in guiding pole is close to the discharge electrode. In the gas discharge lamp as described above, the built-in guiding electrode includes an auxiliary pole provided at the built-in guiding tip portion and opposed to the discharge electrode. In the gas discharge lamp as described above, the end of the built-in guiding pole is connected to the choke circuit via the impedance element. a gas discharge lamp as described above, the built-in guiding pole comprising a first built-in guiding pole and a second built-in guiding pole, the impedance element comprising a first impedance element and a second impedance element, the first end of the first built-in guiding pole a second end of the first built-in guiding electrode is connected to the choke circuit via a first impedance element; the first end of the second built-in guiding electrode is adjacent to the lamp tube The discharge electrode of the two ends, the second end of the second built-in guiding electrode is connected to the choke circuit via the second impedance element. In the gas discharge lamp as described above, the impedance element is at least one of a capacitor, an inductor and a resistor. In the gas discharge lamp as described above, the distance between the end of the built-in guiding pole and the electric electrode of the discharge -6-201042700 is 2 to 10 m m. In the gas discharge lamp as described above, the distance between the auxiliary electrode of the built-in guiding electrode and the discharge electrode is 2 to 1 Omm. A gas discharge lamp as described above, which is a fluorescent lamp coated with phosphor powder on the inner wall of the tube. A gas discharge lamp as described above, which is an inner wall of the tube _ an ultraviolet lamp, an infrared lamp, a high pressure gas discharge lamp or a xenon arc lamp which is not coated with phosphor powder. The gas discharge lamp as described above further includes a capacitor disposed in parallel with the discharge electrode at both ends of the lamp tube. In the gas discharge lamp as described above, at least a portion of the connection line connecting the capacitor to the discharge electrode is disposed inside the bulb. The gas discharge lamp as described above, the connecting wire disposed inside the bulb encloses the glass. According to the gas discharge lamp of the present invention, since the built-in guiding electrode is used, 放电 causes the discharge current path between the discharge electrodes at both ends of the lamp tube to be greatly shortened during the start of the discharge lamp, thereby eliminating the need for transient high-voltage discharge and becoming hot. The cathode start is a cold cathode start, which effectively improves the working life of the discharge lamp. Moreover, the discharge lamp eliminates the need for a conventional starter, eliminating the drawbacks of frequent replacement due to damage to the starter, making the daily maintenance of the discharge lamp more convenient. [Embodiment] Fig. 2 is a schematic view showing a gas discharge lamp according to an embodiment of the present invention. Referring to FIG. 2, the two lead wires 201042700 of the discharge electrode e at the end of the lamp tube are connected in a short circuit in the cap of the lamp tube end, and the built-in guide pole p is disposed along the inner wall of the crucible, and the end ends thereof are respectively Close to the electrode e at both ends of the tube. The guiding pole is composed, for example, of a nickel piece, a magnesium wire, a molybdenum, a tungsten or a genus material thereof, and the two ends are disposed toward the discharge electrode, for example, one extending toward the latter, and the spacing between the two is, for example, when the power supply voltage is 220. When the inner diameter of the discharge lamp is about 17 mm, the inner diameter of the discharge lamp is about 2 to 10 mm, preferably 5 mm, for example, 50 Hz or 60 Hz. The body of the guiding pole is fixed to the inner wall of the tube, for example, with glass beads g. When the switch K is closed, a power source is applied to the discharge electrodes at both ends of the tube. The discharge electrode transients at both ends shorten the discharge distance by means of the guiding pole. A part of the current flows along the guiding pole (with shunting action) inside the tube. The continuous discharge between the discharge electrode and the leading pole extension excites the discharge of the mercury vapor, thereby causing the gas discharge lamp to enter a normal working state. According to the gas discharge lamp of the embodiment, it is not necessary to apply a high voltage to the discharge electrode during starting, thereby The discharge is started in the state of cold cathode starting. Fig. 3A is a schematic view showing a gas discharge according to another embodiment of the present invention. Referring to Fig. 3, the two wires of the discharge electrode e at the end of the lamp tube are connected in a short circuit in the cap of the lamp tube end, and the inner wall of the built-in guide P tube is disposed, and the end ends thereof are close to the lamp tube. The discharge electrodes e are provided with auxiliary poles a 1 and a2, respectively. The auxiliary pole is, for example, a tungsten wire, preferably in a spiral shape. The distance between the auxiliary pole and the discharge electrode is, for example, when the power supply voltage is 220 volts or 110 volts, the power supply frequency is 60 Hz, the inner diameter of the discharge lamp is about 17 mm, the length is 1.2 m, and the left lamp is discharged by the gold section, and the length is 3 volts. . The voltage makes the flow tube internal. The upper lamp point lamp is led out along the position of the lamp. 50Hz right when 201042700 is set at 2 to l〇mm, preferably 3 to 5mm. The body of the guiding pole is fixed, for example, by the ends of the ends of the lamp. In contrast to the embodiment shown in Fig. 2, the end of the guide pole, for example, also passes through the end of the lamp and the external impedance element is connected to the choke circuit. The impedance elements shown in the figures are capacitors C 1 and C2, but the impedance elements are not limited to capacitors, but inductors or resistors or combinations thereof may also be used. In the production, for example, the impedance element can be enclosed in the cap of the lamp tube or encapsulated in the lamp tube. When considering the package in the lamp tube, for example, the discharge gas can be regarded as the impedance element. Thus, the lamp with the built-in guiding pole of the present invention can be directly mounted to the lamp socket using a conventional circuit configuration without any change to the circuit configuration. The built-in guiding pole P shown in Fig. 3A has its both end portions taken out from both end portions of the lamp tube, respectively. As a variant, the built-in guiding pole P can also take only one of the ends out of one end of the tube, so that only one of the impedance elements C1 and C2 is required. As another alternative, the auxiliary poles a1 or a2 provided on the leading poles may also be omitted (see Fig. 3B). Figure 4 is a schematic illustration of a gas discharge lamp in accordance with another embodiment of the present invention. 4A is different from that shown in Fig. 3 in that two built-in guide poles are provided in the discharge lamp tube. Wherein the first end portion of the first built-in guiding pole P1 is disposed on the first end portion of the first auxiliary pole a1 adjacent to the first discharge electrode el, and the first end portion of the second built-in guiding pole P2 is disposed adjacent to the second discharge electrode e2. Second auxiliary pole a2. The spacing between the auxiliary poles & 1 and a2 and the discharge electrodes el and e 2 is, for example, when the power supply voltage is 2 250 volts, the power supply frequency is 50 Hz or 60 Hz, the discharge lamp has an inner diameter of about 17 mm, and the length is i.2 m & right. The time is 2 to 1 mm, preferably 3 to 5 mm. The second internal end of the first built-in lead 201042700 is connected to the choke via the first impedance element. The second end of the second built-in guiding pole P2 is connected to the second impedance element through the second impedance element. The impedance elements shown in the figure are capacitors C1 and C2, and the components are not limited to capacitors, and inductors or resistors may be used or the embodiment shown in Fig. 4 uses two built-in guiding poles to start the lamp. Time is faster. Fig. 5 is a schematic view showing a gas according to another embodiment of the present invention. Referring to FIG. 5, unlike FIG. 4, the first auxiliary pole a1 disposed on the first end of the first conductive pole P1 is disposed close to the electric electrode e2, and the first end of the second built-in guiding pole P2 is provided. The second auxiliary pole a2 is disposed close to the first discharge electrode el. This built-in guide does not have to be as long as in Figure 4. The gas discharge lamp shown in Fig. 5 employs a U-shaped lamp tube, and it will be understood by those skilled in the art that the lamp of the present invention is not limited to straight tubes and tubes, but is also applicable to lamps of any shape. Fig. 6A is a schematic view showing an air lamp according to another embodiment of the present invention. Wherein, two discharge electrodes e at the end of the lamp tube are connected to an impedance element (for example, a capacitor) Ca, which functions to absorb the pulse current of the back EMF pulse or its signal when the lamp is opened or closed or encounters external interference, preventing the pulse. The destruction of the discharge electrode by the current prevents the sputtering current from damaging the discharge electrode. In Fig. 6A, the connecting line B between the member Ca and the discharge electrode e is disposed at the portion. Fig. 6B is a view showing a gas circuit according to another embodiment of the present invention, connected to a 鎭 but impedance combination. Instead, the discharge lamp can be built in. The second stage is placed on the 'two-domain' U-shaped lamp body discharge and when it discharges, he interferes with, for example, the impedance element of the lamp body discharge -10- 201042700. The difference from Fig. 6A is that a section of the connecting line B between the impedance element Ca and the discharge electrode e is disposed inside the bulb. As a variant, the connecting line B disposed inside the tube, for example, is wrapped with glass G' to reduce the influence of the inside of the tube such as gas, impurities or temperature, discharge current, and the like. It should be noted that FIGS. 6A and 6B are only two schematic diagrams, and the configuration in which the impedance element Ca is connected in parallel between the two discharge electrodes e at the end of the lamp tube is also applicable to the above-mentioned FIG. 2, FIG. 3A, and FIG. And the scheme shown in Figure 5 and its corresponding transformation. Moreover, for example, in the solution shown in Fig. 6B, the capacitance Ca may be provided, for example, in the base of the lamp tube, for example, the base of the outer casing. Moreover, the connecting wire B can be directly connected to the end of the discharge electrode in the lamp cap, for example, without extending to the outside of the lamp tube. The principle of the gas-discharge lamp with built-in guiding pole of the present invention can be applied to a discharge lamp such as a fluorescent lamp coated with fluorescent powder in a tube, and can also be applied to, for example, an ultraviolet lamp or an infrared lamp in which no fluorescent powder is coated in the tube. A discharge lamp such as a high-pressure gas discharge lamp or an arc lamp. The above is a preferred embodiment of the present invention, and various changes and modifications may be made by those skilled in the art in light of the concept of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS A built-in guide electrode gas discharge lamp of the present invention will be described in detail below with reference to the accompanying drawings and embodiments. The same reference numbers in the drawings denote the same or similar elements or components. The above and other objects, features and advantages of the present invention will become more apparent from the description of the appended claims. Fig. 1 is a schematic view showing a starting process of a conventional gas discharge lamp. Fig. 2 is a schematic view showing a gas discharge lamp in accordance with an embodiment of the present invention. 3A and 3B are respectively schematic views showing a gas discharge lamp according to another embodiment of the present invention. Fig. 4 is a schematic view showing a gas discharge lamp in accordance with another embodiment of the present invention. Fig. 5 is a schematic view showing a gas discharge lamp in accordance with another embodiment of the present invention. 6A and 6B are respectively schematic views showing a gas discharge lamp according to another embodiment of the present invention. [Description of main component symbols] Μ : Lamp S: Starter L · 'Current Κ : Switch e : Discharge electrode P : Guide P1 : First built-in guide P2 : Second built-in guide a 1 : First Auxiliary pole a2: second auxiliary pole-12- 201042700 C 1, C2: capacitor e 1 : first discharge electrode e2 : second discharge electrode G : outer glass B : connecting line. C a : impedance element (capacitance) g : Glass beads
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