1354313 ⑴ 九、發明說明 【發明所屬之技術領域】 本發明是關於放電燈者，更具體地，尤其是關於具有 通用於大電流用的箔密封構造的放電燈。 【先前技術】 放電燈是一般廣泛地使用在利用由此所放射的紫外線 的領域，例如光化學產業領域，半導體元件的製造領域， 其他領域。 在大電流用的放電燈，發光氣體的主成分的水銀封入 量較多’而在點燈時，發光管內部成爲高壓，而且發熱量 較大’因此，尤其是在側管或其內部的玻璃，必須作成耐 熱性及耐壓性較大者。又在點燈中發光管內的水銀必須完 全地蒸發，所以在點燈中的發光管內必須沒有產生水銀凝 縮的低溫度部分。 由此些事項，在大電流用的放電燈，並不是藉由將形 成發光管的玻璃直接焊著於給電用的引入棒，連成發光管 的氣密封閉的所謂桿密封構造，而是採用著使用封裝用的 金屬箔的箔密封構造。 第7圖是表示具有箔密封構造的放電燈的一例的說明 圖。也如日本實開平6-73856號公報所示地，放電燈是於 發光管82兩端具備側管81的封體8內配置有電極9般地 ’封裝.用導電部Μ被封裝於側管81。封裝用導電部Μ是 由玻璃構件1及金屬箔2，金屬板3，電極芯棒4，外部引 -4- (2) (2)1354313 入棒5,保持用筒體6，外部引入棒保持用筒體7，電極9 所構成。 將外周面朝軸方向延伸般地例如互相隔離配置有5枚 帶狀金屬箔2於筒狀玻璃構件1。此些金屬箔2的前端部 ，是被連接於配置在電極芯棒4的基端部的金屬板3。另 一方面，金屬箔2的後端部，是被連接於插通外部引入棒 5的金屬構件51。又，在電極芯棒4的外周，配置有發光 管側的前端部62被加工成推拔狀，而側部621成爲薄壁 部66的玻璃製保持用筒體6,而在玻璃構件1的後端，經 由金屬構件51，配置有的外部引入棒保持用筒體7。又， 9是被固定於電極芯棒4前端所設置的電極。 將如上述地所構成的封裝用導電部Μ密封於封體8的 側管81內的次序，是將封體8設置成爲軸方向水平，而 將封裝用導電部Μ插入配置於側管81成爲電極9位於發 光管82內。此時側管81的內徑是作成比具有封裝用導電 部Μ的最大直徑的電極9之外徑還大約如3mm而容易插 入封裝用導電部M。又，從側管81的外部使用燃燒器等 進行加熱處理’該封裝用導電部Μ所插入配置的側管81 ，而經由金屬箔2氣密地焊著側管81的內周與保持用筒 體6，及側管81的內周與玻璃構件1的外周。此時，保持 用筒體6的前端部62是被加工成推拔狀之故，因而保持 用筒體6的發光管側，是使用與其他相比較還小的熱量使 之過熱也可焊著側管81，不會比側管81的保持用筒體6 還過剩地加熱發光管側使之變形。 -5- (3) (3)1354313 又，在另一方的側管81，也與上述同樣地連接封裝用 導電部Μ。 然而，在火電流用放電燈，因在電極9必須具火熱容 量，因此使用如700g以上者。設有如此電極9的封裝用 導電部Μ，是當被插入配置於具有比其外徑還大的內徑的 側管8 1內，則與封裝用導電部Μ的後端側之重量相比較 ，電極9的重量較重之故，因而無法得到後端側與電極側 的平衡，而對於側管81的軸方向令電極側配置成朝徑向 下方傾斜的狀態。 第8圖是表示電極側以朝徑方向下方傾斜的狀態所配 置的放電燈的擴大斷面圖。 在側管81內當封裝用導電部Μ歪斜，則封裝用導電 部Μ是在後端側令外部引入棒保持用筒體7的後端面71 的側部7 2抵接於側管8 1，而在電極側令保持用筒體6的 前端部62的側部62 1抵接於側管81。保持用筒體6的發 光管側的前端部62的側部621是成爲薄壁部66之故，因 而當加上荷重時，容易發生缺口。若保持用筒體6有缺口 ，則在點燈時由該處發生龜裂而使放電燈破裂，或是藉由 缺口的碎片而傷及封體8，在點燈中有放電燈破裂之虞。 專利文獻1 :日本實開平6-73 8W號公報 【發明內容】 本發明是依據如上的事項而創作者，提供即使被插入 於側管內的封裝用導電部對於軸方向全電極側朝徑方向下 -6 - (4) 1354313 方傾斜，保持用筒體的發光管側的前端部也 在點燈時不會破裂的放電燈，作爲目的。 本案第1項發明的放電燈，具備：於發 側管的封體，及配置於上述側管內部的玻璃 上述玻璃構件的外周所配置的金屬箔，及從 述發光管內部延伸般地所配置的電極芯棒， 極芯棒前端的電極，及配置於上述電極芯棒 側管的內周之間，發光管側的前端部被加工 持用筒體，其特徵爲：上述保持用筒體，是 小徑部，及玻璃構件側的大徑部，及連接小 的推拔部所構成。 又，本案第2項的發明，是在本案第1 上述保持用筒體是玻璃構件側的後端部被加 而其內徑比玻璃構件的發光管側的前端面之 蓋玻璃構件般地所形成。 依照本發明的放電燈，即使在側管內令 的電極側對於軸方向朝徑方向下方傾斜，保 成由發光管側的小徑部，及玻璃構件側的大 小徑部與大徑部的推拔部所構成之故，因而 筒體的發光管側的前端部之側部，而是保持 部的前端側部抵接於側管，因此保持用筒體 前端部不會有缺口。藉由此，可提供在點燈 裂的放電燈 不會缺口，而 光管兩端設有 構件，及沿著 上述側管朝上 及設於上述電 的外周與上述 成推拔狀的保 由發光管側的 徑部與大徑部 項的發明中， 工成推拔狀， 外徑還大，覆 封裝用導電部 持用筒體是構 徑部，及連接 並不是保持用 用筒體的大徑 的發光管側的 時不會發生破 (5) (5)1354313 【實施方式】 針對於本發明的第1實施形態加以說明。第1圖是 表示本發明的放電燈的說明用斷面圖。 在該圖中，1是圓柱狀的玻璃構件，2是帶狀的金屬 箱，3是圓盤狀的金屬板，4是電極芯棒，5是外部引入棒 ，6是保持用筒體，7是外部引入棒保持用筒體’ 9是電極 ，8是發光管82與於其兩端設有側管81的封體。 放電燈是於發光管82的兩端具備側管81的封體8內 配置有電極9般地，使得封裝用導電部Μ被密封於側管 81。封裝用導電部Μ是由玻璃構件1及金屬箔2，金屬板 3，電極芯棒4，外部引入棒5，保持用筒體6，外部引入 棒保持用筒體7，電極9所構成。 圓柱狀的玻璃構件1是在發光管側的前端面1 1，配置 有圓盤狀的金屬板3，於後端面12形成有用以設置外部引 入棒5的孔13。在金屬板3的中央，令電極芯棒4從側管 81朝發光管82延伸至封體8的軸方向般地被固定。在該 電極芯棒4前端設有電極9。 金屬板3與電極芯棒4的連接方法是並未特別加以限 定，惟例如可使用對焊接金屬板3與電極芯棒4，或在金 屬板3的中央形成穴，而在該穴插入電極芯棒4之基端俾 焊接兩者的方法等。作爲構成金屬板3所用的材料，可列 舉鉅、鈮、鎢、鉬等的高熔點金屬。 在玻璃構件1的孔13的內部，插入具有適合於此的 外徑的外部引入棒5，而在玻璃構件丨的後端面12，配置 -8 - (6) (6)1354313 有連接於外部引入棒5般地形成有穴的金屬構件51，經由 該金屬構件51’配置有玻璃製的外部引入棒保持用筒體7 。作爲構成金屬構件51所用的材料，可例舉鉬等》 在玻璃構件1的外周，在其周方向互相地隔離，配置 有朝玻璃構件i的軸方向延伸的例如5枚帶狀鉬製的金屬 箔2，此些金屬箔2的各該前端部21，是沿著玻璃構件1 ，又藉由點焊接等的手段被連接於配置在電極芯棒3的基 端部的金屬板3。又，金屬箔2的各該後端部22是與金屬 構件5 1相連接。 又，在電極芯棒4的外周與封體8的側管81的內周 之間，配置有玻璃製保持用筒體6。保持用筒體6是發光 層側的前端部62的直徑比玻璃構件1側的後端61的直徑 還小般地所形成，由連續於前端部62的圓柱狀小徑部64 ，及連續於後端部61的圓柱狀大徑部63，及連接小徑部 64與大徑部63的推拔部65所構成。 又，當氣密地焊著側管81內周與保持用筒體6時， 不會將發光管側比側管8 1的保持用筒體6還過剩地加熱 使之變形般地，保持用筒體6的前端部62是被加工成推 拔狀，而中央凹成硏鉢狀，側部62 1是成爲薄壁部66。藉 由如此地進行加工，保持用筒體6的發光管側是與其他相 比較，以較小熱量使之過熱也可焊著側管8 1，不會比側管 81的保持用筒體6還過剩地加熱發光管側使之變形。 列舉上述放電燈的數値例有如下所述。 封體 8是全長度爲150mm，發光管的最大外徑爲 -9- (7) 1354313 12 0mm，側管81的最大外徑爲35mm。發光管82的內部 的封入水銀密度是在20mg/cm3至50mg/cm3的範圍，例如 4〇mg/Cm3。在發光管 82，作爲惰性氣體封入有 50kPa〜300kPa氣氣體。1354313 (1) Description of the Invention [Technical Field] The present invention relates to a discharge lamp, and more particularly to a discharge lamp having a foil sealing structure for use in a large current. [Prior Art] A discharge lamp is generally widely used in the field of utilizing ultraviolet rays radiated therefrom, for example, in the field of photochemical industry, in the field of manufacturing semiconductor elements, and other fields. In a discharge lamp for a large current, the amount of mercury enclosed in the main component of the luminescent gas is large. When the lamp is turned on, the inside of the arc tube becomes a high voltage, and the amount of heat generation is large. Therefore, especially in the side tube or the glass inside thereof It must be made of heat resistance and pressure resistance. Also, in the lighting, the mercury in the arc tube must be completely evaporated, so that there must be no low temperature portion in the arc tube in the lighting to cause mercury condensation. Therefore, in the case of a discharge lamp for a large current, it is not a so-called rod sealing structure in which the glass forming the arc tube is directly welded to the inlet rod for power supply, and is connected to the hermetic seal of the arc tube. A foil sealing structure using a metal foil for encapsulation is used. Fig. 7 is an explanatory view showing an example of a discharge lamp having a foil sealing structure. As shown in Japanese Laid-Open Patent Publication No. Hei 6-73856, the discharge lamp is packaged in the sealed body 8 including the side tube 81 at both ends of the arc tube 82. The conductive member is packaged in the side tube. 81. The conductive portion for packaging is composed of a glass member 1 and a metal foil 2, a metal plate 3, an electrode core rod 4, an external lead -4-(2) (2) 1354313 into the rod 5, a holding cylinder 6, and an external introduction rod The cylinder 7 and the electrode 9 are used. Five strip-shaped metal foils 2 are placed on the tubular glass member 1 so as to be spaced apart from each other, for example, by extending the outer peripheral surface in the axial direction. The front end portions of the metal foils 2 are connected to the metal plate 3 disposed at the base end portion of the electrode core rod 4. On the other hand, the rear end portion of the metal foil 2 is connected to the metal member 51 through which the external introduction rod 5 is inserted. Further, on the outer circumference of the electrode mandrel 4, the front end portion 62 on the side of the arc tube is processed into a push-out shape, and the side portion 621 is a glass holding cylinder 6 of the thin portion 66, and the glass member 1 is placed on the glass member 1. The rear end is provided with an external introduction rod holding cylinder 7 via the metal member 51. Further, 9 is an electrode provided to be fixed to the tip end of the electrode mandrel 4. In the order in which the sealing portion for sealing of the package 8 configured as described above is sealed in the side tube 81 of the sealing body 8, the sealing body 8 is placed horizontally in the axial direction, and the conductive portion 封装 for packaging is inserted into the side tube 81. The electrode 9 is located inside the arc tube 82. At this time, the inner diameter of the side tube 81 is approximately 3 mm larger than the outer diameter of the electrode 9 having the largest diameter of the package conductive portion 而, and is easily inserted into the package conductive portion M. In addition, the side tube 81 in which the conductive portion 封装 is inserted is inserted from the outside of the side tube 81 by a burner or the like, and the inner circumference of the side tube 81 and the holding tube are hermetically welded via the metal foil 2 The body 6 and the inner circumference of the side tube 81 and the outer circumference of the glass member 1. At this time, the front end portion 62 of the holding cylinder 6 is processed into a push-out shape. Therefore, the side of the arc tube of the holding cylinder 6 is heated by using a small amount of heat compared with other ones. The side tube 81 does not excessively heat the side of the arc tube to be deformed more than the holding cylinder 6 of the side tube 81. -5- (3) (3) 1354313 Further, in the other side tube 81, the package conductive portion 连接 is also connected in the same manner as described above. However, in the case of a discharge lamp for a fire current, since the electrode 9 must have a heat capacity, it is used, for example, 700 g or more. The package conductive portion 设有 provided with such an electrode 9 is inserted into the side tube 8 1 having an inner diameter larger than the outer diameter thereof, and is compared with the weight of the rear end side of the package conductive portion Μ Since the weight of the electrode 9 is heavy, the balance between the rear end side and the electrode side cannot be obtained, and the axial direction of the side tube 81 is arranged such that the electrode side is inclined downward in the radial direction. Fig. 8 is an enlarged cross-sectional view showing the discharge lamp disposed on the electrode side in a state of being inclined downward in the radial direction. When the package conductive portion is skewed in the side tube 81, the package conductive portion Μ is a side portion 7 2 of the rear end surface 71 of the external introduction rod holding cylinder 7 on the rear end side abuts against the side tube 81. On the other hand, the side portion 62 1 of the distal end portion 62 of the holding cylinder 6 abuts against the side tube 81. The side portion 621 of the distal end portion 62 of the holding cylinder 6 on the light-emitting tube side is the thin portion 66. Therefore, when a load is applied, the gap is likely to occur. If the holding cylinder 6 has a notch, the discharge lamp is broken by the crack at the time of lighting, or the sealing body 8 is damaged by the chipping of the notch, and the discharge lamp is broken in the lighting. . [Patent Document 1] Japanese Patent Application Laid-Open No. Hei 6-73 No. Heisei No. Hei. No. 6-73 8W. The present invention provides a package for a conductive portion of a package that is inserted into a side tube in the radial direction of the entire electrode side in the axial direction. The lower -6 - (4) 1354313 is inclined, and the front end portion of the holding cylinder on the side of the arc tube is also a discharge lamp that does not break when lighting. In the discharge lamp of the first aspect of the invention, the metal foil disposed on the outer periphery of the glass member disposed inside the side tube and disposed inside the side tube, and the metal foil disposed on the outer periphery of the light-emitting tube The electrode core rod, the electrode at the tip end of the pole core rod, and the inner peripheral portion disposed on the inner side of the electrode core rod side tube, and the front end portion on the side of the light-emitting tube is processed by the cylindrical body, and the holding cylinder body is characterized by It is composed of a small diameter portion, a large diameter portion on the side of the glass member, and a push portion having a small connection. In addition, in the first aspect of the invention, the holding cylinder is a cover glass member in which the rear end portion of the glass member side is added and the inner diameter thereof is larger than the front end surface of the glass member on the light-emitting tube side. form. According to the discharge lamp of the present invention, even if the electrode side of the side tube is inclined downward in the radial direction with respect to the axial direction, the small-diameter portion on the side of the light-emitting tube and the large-diameter portion and the large-diameter portion on the glass member side are secured. Since the pull-out portion is formed, the side portion of the front end portion of the tubular portion on the light-emitting tube side of the tubular body and the front end portion of the holding portion abut against the side tube, so that the front end portion of the holding cylinder does not have a notch. Thereby, it is possible to provide a discharge lamp which is cracked in the light without a gap, and a member is provided at both ends of the light pipe, and the outer circumference of the electric tube is arranged upward and along the side tube and the above-mentioned push-pull shape is maintained. In the invention of the diameter portion and the large diameter portion of the light-emitting tube side, the outer diameter is large, and the outer diameter of the outer portion for covering the package is a diameter-receiving portion, and the connection is not a holding cylinder. When the large-diameter light-emitting tube side is not broken (5) (5) 1354313 [Embodiment] The first embodiment of the present invention will be described. Fig. 1 is a cross-sectional view showing the discharge lamp of the present invention. In the figure, 1 is a cylindrical glass member, 2 is a strip-shaped metal box, 3 is a disc-shaped metal plate, 4 is an electrode core rod, 5 is an external introduction rod, and 6 is a holding cylinder, 7 The external introduction rod holding cylinder '9 is an electrode, and 8 is an arc tube 82 and a sealing body having side tubes 81 at both ends thereof. The discharge lamp is arranged such that the electrode 9 is disposed in the sealed body 8 having the side tube 81 at both ends of the arc tube 82, so that the package conductive portion 密封 is sealed to the side tube 81. The conductive portion for packaging is composed of a glass member 1 and a metal foil 2, a metal plate 3, an electrode core rod 4, an external introduction rod 5, a holding cylinder 6, an external introduction rod holding cylinder 7, and an electrode 9. In the cylindrical glass member 1, a disk-shaped metal plate 3 is disposed on the front end surface 1 of the arc tube side, and a hole 13 for providing the external introduction rod 5 is formed in the rear end surface 12. In the center of the metal plate 3, the electrode mandrel 4 is fixed from the side pipe 81 toward the arc tube 82 to the axial direction of the sealing body 8. An electrode 9 is provided at the front end of the electrode mandrel 4. The method of joining the metal plate 3 to the electrode mandrel 4 is not particularly limited, but for example, the pair of welded metal plates 3 and the electrode mandrel 4 may be used, or a hole may be formed in the center of the metal plate 3, and the electrode core may be inserted at the hole. The method of welding both the base end of the rod 4 and the like. As the material for constituting the metal plate 3, a high melting point metal such as giant, bismuth, tungsten or molybdenum can be listed. Inside the hole 13 of the glass member 1, an external introduction rod 5 having an outer diameter suitable for this is inserted, and at the rear end surface 12 of the glass member, the arrangement -8 - (6) (6) 1354313 is connected to the outside. A metal member 51 having a hole is formed in a rod shape, and a cylindrical outer holding rod holding cylinder 7 made of glass is disposed via the metal member 51'. As the material for constituting the metal member 51, for example, molybdenum or the like is exemplified, and the outer periphery of the glass member 1 is separated from each other in the circumferential direction, and for example, five strip-shaped molybdenum metals extending in the axial direction of the glass member i are disposed. The foil 2, each of the front end portions 21 of the metal foils 2 is connected to the metal plate 3 disposed at the base end portion of the electrode mandrel 3 along the glass member 1 by means of spot welding or the like. Further, each of the rear end portions 22 of the metal foil 2 is connected to the metal member 51. Further, a glass holding cylinder 6 is disposed between the outer circumference of the electrode core rod 4 and the inner circumference of the side tube 81 of the sealing body 8. The front end portion 62 of the holding cylinder 6 on the side of the light-emitting layer is formed to have a smaller diameter than the diameter of the rear end 61 on the side of the glass member 1, and is continuous with the cylindrical small-diameter portion 64 of the front end portion 62, and is continuous with The cylindrical large-diameter portion 63 of the rear end portion 61 and the push-out portion 65 that connects the small-diameter portion 64 and the large-diameter portion 63 are formed. When the inner circumference of the side pipe 81 and the holding cylinder 6 are hermetically welded, the arc tube side is not excessively heated and deformed by the holding cylinder 6 of the side pipe 8 1 for maintenance. The front end portion 62 of the tubular body 6 is processed into a push-out shape, and the center portion is formed in a meandering shape, and the side portion 62 1 is a thin portion 66. By performing the processing in this manner, the side of the light-emitting tube of the holding cylinder 6 is compared with the other, and the side tube 8 1 can be welded with less heat, and the holding tube 6 of the side tube 81 is not welded. The side of the arc tube is also excessively heated to deform it. The numerical examples of the above discharge lamps are as follows. The envelope 8 has a full length of 150 mm, the maximum outer diameter of the arc tube is -9-(7) 1354313 12 0 mm, and the maximum outer diameter of the side tube 81 is 35 mm. The density of the enclosed mercury in the interior of the arc tube 82 is in the range of 20 mg/cm3 to 50 mg/cm3, for example, 4 〇 mg/cm3. In the arc tube 82, a gas of 50 kPa to 300 kPa is sealed as an inert gas.
又，玻璃構件1是全長度爲4 0 mm至9 0mm的範圍， 例如60mm，外徑爲20mm至50mm的範圍，例如23.5mm 。保持用筒體6的大徑部63的全長度爲5mm至20mm的 範圍，例如1 0mm，大徑部63的外徑爲20mm至50mm的 範圍，例如30mm，小徑部64的全長度爲 5mm至20mm 的範圍，例如15mm，小徑部的外徑爲15mm至40mm的 範圍’例如20mm，推拔部65的全長度爲3mm至20mm 的範圍，例如5mm。電極9是全長度爲60mm，最大外徑 爲30mm，而重量爲例如800g。 將如上述地所構成的封裝用導電部Μ密封於封體8的 側管81的次序，是將封體8設置成爲軸方向水平，並將 封裝用導電部Μ插入配置成令電極9位於發光管82內。 這時候’側管81的內徑是容易插入封裝用導電部Μ般地 ，比具有封裝用導電部Μ的最大徑的電極9的外徑還大 0.5mm至3mm，例如還大約3mm。而且，由側管8 1的外 部使用燃燒器等來加熱處理插入配置有該封裝用導電部Μ 的側管8 1 ’經由金屬箔2氣密地焊著側管81的內周與保 持用筒體6，及側管81的內周與玻璃構件1的外周。又， 在另一方的側管81 ’也與上述同樣地密封封裝用導電部μ -10- (8) (8)1354313 第2圖是表示在本發明的放電燈製造途中，將封裝用 導電部Μ插入配置於側管81內的狀態的擴大斷面圖。 在本構成中，當封裝用導電部Μ是被插入配置於具有 比其外徑還大的內徑的側管8 1內，則電極9的重量與封 裝用導電部Μ的後端側的重量相比較還大之故，因而無法 得到後端側與電極側的平衡，對於側管8 1的軸方向也令 電極側配置成朝徑方向下方傾斜的狀態。 然而，保持用筒體6是構成由發光管側的小徑部64， 及玻璃構件側的大徑部63，及連接小徑部64與大徑部63 的推拔部65所成之故，因而封裝用導電部Μ是在側管81 內對於軸方向令電極側朝徑方向下方傾斜時，則在後端側 令外部引入棒保持用筒體7的後端面71的側部72抵接於 側管81，而在發光管側令保持用筒體6的大徑部63的前 端側部63 1抵接於側管81。大徑部63與推拔部65的連接 面，是形成成爲90°以上的鈍角，但未如前端部62地被加 工成推拔狀的薄壁部66之故，因而即使大徑部63的前端 側部631與側管81抵接而施加荷重也不會有缺口之慮。 又，也不會有在點燈時由保持用筒體6的缺口發生龜裂而 使放電燈破裂，也不會有藉由破裂的碎片傷及封體8,而 在點燈中放電燈破裂的情形》 第3圖是表示用以說明保持用筒體6的形狀上成爲必 需條件的圖式。 在該圖中，Di是保持用筒體6的小徑部64的直徑， D2是大徑部63的直徑，是從小徑部64 —直到推拔部 -11 - (9) (9)1354313 65爲止的軸方向長度，1^2是從保持用筒體6的大徑部63 一直到玻璃構件1 ’外部引入棒保持用筒體7爲止的軸方 向長度。又，是表示封裝用導電部Μ對於側管81的 傾斜角度’ 0 2是表示藉由在保持用筒體6設置小徑部64 所得到的容許角度。 0 1比0 2還大，亦即β 1 > 0 2時，則保持用筒體6的 薄壁部66會抵接於側管81之故，因而保持用筒體6的前 端有缺口之慮。 Θ !與0 2的大小相等，亦即0 i = 0 2時，則保持用筒 體6的薄壁部66，及大徑部63的前端側部631、均抵接 於側管8 1。施加於封裝用導電部Μ的電極側的荷重是被 分散成兩個，惟保持用筒體6的前端有缺口之慮。 Θ i比0 2還小’亦即0 1 < 0 2時，則保持用筒體6的 大徑部63的前端側部631抵接於側管81。大徑部63的前 端側部63 1是即使與側管8 1抵接而施加荷重也不會有缺 口之故，因而不會有在點燈中令放電燈破裂的情形。 藉由此，必須構成爲0 i比0 2還小，亦即成爲0 j < 0 2° 由三角函數求出0 1與02的大小。 可將封裝用導電部Μ容易地插入於側管81內般地， 側管8 1的內徑是設計成比保持用筒體6還大。但是，若 側管8 1的內徑過大，則令封裝用導電部Μ傾斜而作業性 變差，因此現實上，側管81的內徑是設計成比封裝用導 電部Μ的外形還大例如3mm。這時候，封裝用導電部Μ -12- (10) (10)1354313 對於側管8 1的傾斜角度0 1是成爲 Θ i=ten-' (3/L2) 封裝用導電部Μ再朝時鐘方向旋轉，令保持用筒體6的薄 壁部66 ’及大徑部63的前端側部631抵接於側管81時， 藉由在保持用筒體6設置小徑部64所得到的容許角度02 是成爲 Θ 2 = 1311-1 [ (D2-D,) /2L!] 成爲0 爲保持用筒體6的薄壁部66未抵接於側管 8 1的條件，因此成爲 D2-D]<6Li/L2 般地，必須形成保持用筒體6。 以下’針對於本發明的第2實施形態加以說明。第4 圖是表示本發明的放電燈的擴大斷面圖。 表示於第4圖的玻璃構件1是與第丨實施形態的放電 燈不相同’在連續於前端面11的部分具有稍細的推拔狀 外周面14，前端面11側爲構成圓錐台狀。又，保持用筒 體6是連續於玻璃構件1側的後端部61令發光管側逐漸 地成爲大徑般地形成有傾斜面68。然而，前端部62是與 -13- 1354313 ου 第1實施形態同樣地，直徑變小般地所形成。保持用筒體 6是由連續於前端部62的圓柱狀小徑部64，及連續於後 端部61的大徑部63’及連接小徑部64與大徑部63的推 拔部65所構成，前端部62是被加工成推拔狀，而成爲薄 . 璧部60。 又’金屬箔2’金屬板3，電極芯棒4，外部引入棒5 ’外部引入棒保持用筒體7，是具有與第1實施形態同樣 的構造者，而省略說明。 Φ 將如上述地所構成的封裝用導電部Μ密封於封體8的 側管81的次序，將封體8設置成爲軸方向水平，而將封 裝用導電部插入配置於側管81令電極9位於發光管82內 ，又，從側管81的外部使用燃燒器等加熱處理插入配置 有該封裝用導電部Μ的側管81，並經由金屬箔2氣密地 焊著側管81的內周與保持用筒體6，及側管81的內周與 玻璃構件1的外周。然而，封裝用導電部Μ是與後端側的 重量相比較，因電極9的重量較大，因此當被插入到側管 ^ 8 1內，則無法得到後端側與電極側的平衡，對於側管8 1 的軸方向令電極側配置成朝徑方向下方傾斜的狀態。 第5圖是表示用以說明保持用筒體6的形狀上成爲必 ' 需條件的圖式。 封裝用導電部Μ是在側管81內對於軸方向令電極側 朝徑方向下方傾斜，構成在電極側令保持用筒體6的大徑 部63的前端側部63 1抵接於側管8 1。這時候，封裝用導 電部Μ的後端側抵接於側管81的狀態是有兩種。亦即’ • 14 - (12) (12)1354313 有外部引入棒保持用筒體7的後端面71的側部72抵接於 側管81的情形[第5 (a)圖]，及保持用筒體6的傾斜 面68與大徑部63的胴部的變傾點632抵接於側管81的 情形[第5 (b)圖]。 外部引入棒保持用筒體7的後端面7 1的側部72抵接 於側管81的情形，是如第5 (a)圖所示地，與第1實施 形態同樣地，將D,作爲保持用筒體6的小徑部64的直徑 ，將D2作爲大徑部63的直徑，將L,作爲從小徑部64 — 直到推拔部65爲止的軸方向的長度，將L2作爲從保持用 筒體6的大徑部63 —直到玻璃構件1，外部引入棒保持用 筒體7爲止的軸方向長度，令 D2-Di<6Lj/L2 能成立般地形成保持用筒體6。 又’保持用筒體6的傾斜面68與大徑部63的胴部的 變傾點632抵接於側管8 1情形，是如第5 (b)圖所示地 ’將L2作爲從保持用筒體6的大徑部63的前端側部631 一直到變傾點632爲止的長度，其他參數是作爲與第$ (a)圖同樣，令 D2*Di<6Li/L2 能成立般地形成保持用筒體6。 -15- (13) (13)1354313 如此地保持用筒體6是構成由發光管側的小徑部64， 及玻璃構件側的大徑部63，及連接小徑部64與大徑部63 的推拔部65所成之故，因而在側管81內封裝用導電部Μ 對於軸方向令電極側朝徑方向下方傾斜時，令保持用筒體 6的大徑部63的前端側部63 1抵接於側管8 1。大徑部63 與推拔部65的連接面，是形成成爲90°以上的鈍角，但未 如前端部62地被加工成推拔狀的薄壁部66之故，因而即 使大徑部63的前端側部631與側管81抵接而施加荷重也 不會有缺口之慮。又，也不會有在點燈時由保持用筒體6 的缺口發生龜裂而使放電燈破裂，也不會有藉由破裂的碎 片傷及封體8，而在點燈中放電燈破裂的情形。 又，如本發明的第2實施形態地，藉由將發光管側的 側管8 1的直徑作成比保持用筒體6還小，且將金屬板3 周邊的側管8 1的直徑作成比保持用筒體6還小，而可提 高放電燈的耐壓強度。 此爲被認定爲如以下理由所致。施加於半徑r的側管 81的內部的壓力是比例於其斷面積（Trr2)。對於該施加 的壓力，不會使封體8破損的耐壓力，是比例於側管8 1 的周長度 （4 π r)。所以，側管8 1是直徑愈小愈增加耐 壓強度。 如第4圖所示地，發光管82是形成大約球狀之故， 因而耐壓強度變高。因此，藉由側管8 1的直徑大小，就 可決定封體8的耐壓強度。在側管81的內部，封入氣體 順著電極芯棒4的外周與保持用筒體6的內孔67之間隙 -16- (14) (14)1354313 一直到金屬板3之故，因而對於耐壓強度，考慮從側管81 的發光管一直到金屬板3就可以。 保持用筒體6與側管81是氣密地被封閉之故，因而 封入氣體存在於側管81的保持用筒體6靠發光管側，保 持闬筒體6的內孔67，金屬板3的周邊。保持用筒體6的 內孔67的直徑是比其他明顯地還小之故，因而決定耐壓 強度，是成爲側管81的保持用筒體6靠發光管側的外徑 大小，或是金屬板3的外徑大小。在第2實施形態中，玻 璃構件1是在連續於發光管側的前端面11的部分具有稍 細推拔狀的外周面14，而金屬板3的周邊被縮徑。保持用 筒體6是形成有連續於玻璃構件1側的後端部61，發光管 側逐漸成爲大徑的傾斜面68，惟藉由經由推拔部65成爲 小徑部64，前端部62是被縮徑。藉由此，可將側管81的 保持用筒體6靠發光管側的外徑作成較小。 以下，針對於本發明的第3實施形態加以說明。第6 圖是表示本發明的放電燈的擴大斷面圖。 表示於第6圖的放電燈，是在第2實施形態的放電燈 中，保持用筒體6的後端部61被加工成推拔狀，而其內 徑比玻璃構件1的前端面Π的外徑還大，保持用筒體6 的後端覆蓋玻璃構件1前端般地所形成者。保持用筒體6 的後端部61是被加工成硏鉢狀，底部是成爲比金屬板3 的外徑稍大的圓狀，被形成成朝側管81的外端側逐漸地 擴大的推拔狀。 如此地*保持用筒體6的後端部61被加工成卡合於 -17- (15) (15)1354313 玻璃構件1的前端，而被形成成覆蓋將金屬箔2配置於外 周的玻璃構件1的前端，則金屬板3更牢固地被固定，而 金屬箔2不容易被引拉之故，因而不容易被切斷。 保持用筒體6的後端未被形成成覆蓋玻璃構件1的前 端時，金屬板3的固定是不強者。所以，若電極9使用極 重時，則金屬板3是爲了電極9的自重，對側管81的軸 方向朝徑方向下方傾斜。認爲從金屬板3的中心被連接於 軸方向上側的金屬箔2是被引拉成延伸會切斷，而從金屬 板3的中心被連接於軸方向下側的金屬箔2產生皺紋。 保持用筒體6是將D1作爲小徑部64的直徑，將D2 作爲大徑部63的直徑，將L!作爲從小徑部64 —直到推 拔部65爲止的軸方向的長度，將L2作爲從保持用筒體6 的大徑部63 —直到玻璃構件1，外部引入棒保持用筒體7 爲止的軸方向長度，令02-0^61^/1^能成立般地形成。 如此地保持用筒體6是構成由發光管側的小徑部64，及玻 璃構件側的大徑部63，及連接小徑部64與大徑部63的推 拔部65所成之故，因而在側管81內封裝用導電部Μ對於 軸方向令電極側朝徑方向下方傾斜時，令保持用筒體6的 大徑部63的前端側部63 1抵接於側管81。大徑部63與推 拔部65的連接面，是形成成爲90°以上的鈍角，但未如前 端部62地被加工成推拔狀的薄壁部66之故，因而即使大 徑部63的前端側部631與側管81抵接而施加荷重也不會 有缺口之慮。又，也不會有在點燈時由保持用筒體6的缺 口發生龜裂而使放電燈破裂，也不會有藉由破裂的碎片傷 -18- (16) (16)1354313 及封體8，而在點燈中放電燈破裂的情形。 又，保持用筒體6是連續於玻璃構件1側的後端部61 形成有大徑部63，惟藉由經由推拔部65形成成爲小徑部 64，前端部62是被縮徑。藉由此，可減小側管81的保持 周简體6靠發光管側的外徑，而可提高放電燈的耐壓強度 【圖式簡單說明】 第1圖是表示本發明的放電燈的說明用斷面圖。 第2圖是表示本發明的放電燈的擴大斷面圖。 第3圖是表示本發明的保持用筒體的形狀的說明用圖 式。 第4圖是表示本發明的放電燈的擴大斷面圖。 第5圖是表示本發明的保持用筒體的形狀的說明用圖 式。 第6圖是表示本發明的放電燈的擴大斷面圖。 第7圖是表示習知的放電燈的說明用斷面圖。 第8圖是表示習知的放電燈的擴大斷面圖。 【主要元件符號說明】 1 :玻璃構件，1 1 :前端面，12 :後端面，13 :孔， 14 :推拔狀外周面，2:金屬箔，21 :前端部，22:後端 部’ 3:金屬板，4:電極芯棒，5:外部引入棒，51:金 屬構件’ 6:保持用筒體，61 :後端部，62:前端部，63 -19- (17)1354313 :大徑部，63 1 :側部，64 :小徑部，65 :推拔部，66 薄壁部，67 :內孔，68 :傾斜面，7 :外部引入棒保持 筒體，7 1 :後端部，72 :側部，8 :封體，8 1 :側管， :發光管，9 :電極。 用 82Further, the glass member 1 is in the range of 40 mm to 90 mm in total length, for example, 60 mm, and has an outer diameter in the range of 20 mm to 50 mm, for example, 23.5 mm. The full length of the large diameter portion 63 of the holding cylinder 6 is in the range of 5 mm to 20 mm, for example, 10 mm, and the outer diameter of the large diameter portion 63 is in the range of 20 mm to 50 mm, for example, 30 mm, and the full length of the small diameter portion 64 is 5 mm. In the range of up to 20 mm, for example, 15 mm, the outer diameter of the small diameter portion is in the range of 15 mm to 40 mm 'for example, 20 mm, and the full length of the push-out portion 65 is in the range of 3 mm to 20 mm, for example, 5 mm. The electrode 9 has a full length of 60 mm, a maximum outer diameter of 30 mm, and a weight of, for example, 800 g. The sealing portion for sealing the conductive portion 构成 formed as described above is sealed in the side tube 81 of the sealing body 8 in such a manner that the sealing body 8 is placed horizontally in the axial direction, and the conductive portion 封装 for packaging is inserted so that the electrode 9 is placed in the light. Inside the tube 82. At this time, the inner diameter of the side tube 81 is easily inserted into the conductive portion for packaging, and is larger by 0.5 mm to 3 mm than the outer diameter of the electrode 9 having the largest diameter of the conductive portion for packaging, for example, about 3 mm. Further, the side tube 8 1 ' in which the conductive portion 该 of the package is disposed is thermally treated by a burner or the like from the outside of the side tube 81, and the inner circumference of the side tube 81 and the holding cylinder are hermetically welded via the metal foil 2. The body 6 and the inner circumference of the side tube 81 and the outer circumference of the glass member 1. In the other side tube 81', the package conductive portion μ-10-(8)(8) 1354313 is also sealed in the same manner as described above. Fig. 2 is a view showing the conductive portion for packaging in the middle of the discharge lamp of the present invention. An enlarged cross-sectional view of the state in which the crucible is inserted into the side tube 81. In the present configuration, when the package conductive portion Μ is inserted into the side tube 8 1 having an inner diameter larger than the outer diameter thereof, the weight of the electrode 9 and the weight of the rear end side of the package conductive portion Μ In comparison with the larger one, the balance between the rear end side and the electrode side cannot be obtained, and the axial direction of the side tube 8 1 is also arranged such that the electrode side is inclined downward in the radial direction. However, the holding cylinder 6 is formed by the small diameter portion 64 on the side of the arc tube, the large diameter portion 63 on the side of the glass member, and the push portion 65 connecting the small diameter portion 64 and the large diameter portion 63. Therefore, when the conductive portion 封装 of the package is inclined downward in the radial direction with respect to the axial direction in the side tube 81, the side portion 72 of the rear end surface 71 of the external introduction rod holding cylinder 7 is brought into contact with the rear end side. In the side tube 81, the front end side portion 63 1 of the large diameter portion 63 of the holding cylinder 6 is brought into contact with the side tube 81 on the side of the arc tube. The connection surface between the large-diameter portion 63 and the push-out portion 65 is formed as an obtuse angle of 90° or more, but is not processed into a thin-walled portion 66 of the tip end portion 62. Therefore, even the large-diameter portion 63 is formed. The front end side portion 631 abuts against the side tube 81, and the load is applied without any gap. Further, the discharge lamp is not broken by the notch of the holding cylinder 6 at the time of lighting, and the discharge lamp is not broken by the broken pieces, and the discharge lamp is broken in the lighting. (3) FIG. 3 is a view showing a condition necessary for explaining the shape of the holding cylinder 6. In the figure, Di is the diameter of the small diameter portion 64 of the holding cylinder 6, and D2 is the diameter of the large diameter portion 63, from the small diameter portion 64 to the push portion -11 - (9) (9) 1354313 65 The length in the axial direction of the holding cylinder body 6 is the length in the axial direction from the large diameter portion 63 of the holding cylinder 6 to the outside of the glass member 1 'to which the rod holding cylinder 7 is introduced. In addition, the angle of inclination '0' of the conductive portion 封装 of the package for the side tube 81 is an allowable angle obtained by providing the small diameter portion 64 in the holding cylinder 6. When 0 1 is larger than 0 2 , that is, β 1 > 0 2 , the thin portion 66 of the holding cylinder 6 abuts against the side tube 81, so that the front end of the holding cylinder 6 is notched. consider. When the size of 0 2 is equal to 0 2 , that is, when 0 i = 0 2 , the thin portion 66 of the holding cylinder 6 and the distal end side portion 631 of the large diameter portion 63 abut against the side tube 8 1 . The load applied to the electrode side of the package conductive portion 是 is dispersed into two, but the front end of the holding cylinder 6 is notched. When Θi is smaller than 0 2', that is, when 0 1 < 0 2, the distal end side portion 631 of the large diameter portion 63 of the holding cylinder 6 abuts against the side tube 81. The front end side portion 63 1 of the large-diameter portion 63 does not have a gap even if the load is applied to the side tube 8 1 , so that the discharge lamp is not broken in the lighting. Therefore, it must be constructed such that 0 i is smaller than 0 2 , that is, becomes 0 j < 0 2° The magnitudes of 0 1 and 02 are obtained by a trigonometric function. The conductive portion of the package can be easily inserted into the side tube 81, and the inner diameter of the side tube 81 is designed to be larger than the holding cylinder 6. However, if the inner diameter of the side pipe 181 is too large, the package conductive portion Μ is inclined and the workability is deteriorated. Therefore, the inner diameter of the side pipe 81 is designed to be larger than the outer shape of the package conductive portion 例如. 3mm. At this time, the conductive portion 封装 -12- (10) (10) 1354313 for the package is inclined to 0 1 for the side tube 8 1 to become Θ i=ten-' (3/L2), and the conductive portion of the package is turned toward the clock direction. When the thin portion 66' of the holding cylinder 6 and the distal end side portion 631 of the large diameter portion 63 abut against the side tube 81, the allowable angle obtained by providing the small diameter portion 64 in the holding cylinder 6 is rotated. 02 is Θ 2 = 1311-1 [ (D2-D,) /2L!] becomes 0. The condition that the thin portion 66 of the holding cylinder 6 does not abut against the side tube 8 1 is therefore D2-D] In the same manner as <6Li/L2, it is necessary to form the holding cylinder 6. Hereinafter, the second embodiment of the present invention will be described. Fig. 4 is an enlarged sectional view showing a discharge lamp of the present invention. The glass member 1 shown in Fig. 4 is different from the discharge lamp of the second embodiment. The outer peripheral surface 14 has a slightly thinned shape in a portion continuous with the distal end surface 11, and the distal end surface 11 has a truncated cone shape. Further, the holding cylinder 6 is formed such that the rear end portion 61 on the side of the glass member 1 has an inclined surface 68 formed such that the arc tube side gradually becomes a large diameter. However, the distal end portion 62 is formed to have a smaller diameter as in the first embodiment. The holding cylinder 6 is a cylindrical small-diameter portion 64 continuous with the distal end portion 62, a large-diameter portion 63' continuous with the rear-end portion 61, and a push-out portion 65 connecting the small-diameter portion 64 and the large-diameter portion 63. In this configuration, the distal end portion 62 is processed into a push-out shape to be thin. Further, the metal foil 2, the metal core 3, the electrode core 4, and the outer lead-in rod 5' are externally introduced into the rod holding cylinder 7, and have the same structure as that of the first embodiment, and the description thereof is omitted. Φ The sealing portion 8 is sealed in the order of the side tube 81 of the sealing body 8 in the order of the side tube 81 of the sealing body 8 as described above, and the sealing portion 8 is placed in the side tube 81 to be the electrode 9 In the arc tube 82, the side tube 81 in which the package conductive portion 配置 is disposed is inserted from the outside of the side tube 81 by heat treatment such as a burner, and the inner circumference of the side tube 81 is hermetically welded via the metal foil 2. The inner circumference of the holding cylinder 6 and the side tube 81 and the outer circumference of the glass member 1 are formed. However, since the conductive portion 封装 for packaging is compared with the weight of the rear end side, since the weight of the electrode 9 is large, when inserted into the side tube 84, the balance between the rear end side and the electrode side cannot be obtained. The axial direction of the side tube 8 1 is such that the electrode side is placed in a state of being inclined downward in the radial direction. Fig. 5 is a view for explaining the condition required for the shape of the holding cylinder 6 to be described. In the side tube 81, the electrode side is inclined downward in the radial direction with respect to the axial direction in the axial direction, and the distal end side portion 63 1 of the large diameter portion 63 of the electrode side holding cylindrical body 6 is in contact with the side tube 8 1. At this time, there are two states in which the rear end side of the package conductive portion 抵 abuts against the side tube 81. That is, the case where the side portion 72 of the rear end surface 71 of the external introduction rod holding cylinder 7 abuts against the side tube 81 [Fig. 5 (a)], and the holding The inclined surface 68 of the cylindrical body 6 and the turning point 632 of the crotch portion of the large diameter portion 63 abut against the side tube 81 [Fig. 5 (b)]. In the case where the side portion 72 of the rear end surface 7 1 of the external introduction rod holding cylinder 7 abuts against the side tube 81, as shown in Fig. 5(a), D is used as in the first embodiment. The diameter of the small-diameter portion 64 of the holding cylinder 6 is set to be D2 as the diameter of the large-diameter portion 63, and L is the length in the axial direction from the small-diameter portion 64 to the push-out portion 65, and L2 is used for holding. The large-diameter portion 63 of the tubular body 6 is the length in the axial direction until the glass member 1 is externally introduced into the rod holding cylinder 7, and the holding cylinder 6 can be formed in a manner that D2-Di <6Lj/L2 can be established. Further, the case where the inclined surface 68 of the holding cylinder 6 and the turning point 632 of the crotch portion of the large diameter portion 63 abut against the side tube 8 1 are as shown in Fig. 5(b). The length of the front end side portion 631 of the large-diameter portion 63 of the cylindrical body 6 up to the pour point 632 is the same as that of the figure (a), so that D2*Di<6Li/L2 can be formed. The cylinder 6 is held. -15- (13) (13) 1354313 The holding cylinder 6 is such that the small diameter portion 64 on the side of the arc tube and the large diameter portion 63 on the side of the glass member, and the small diameter portion 64 and the large diameter portion 63 are connected. When the push-out portion 65 is formed, the conductive portion □ is encapsulated in the side tube 81. When the electrode side is inclined downward in the radial direction in the axial direction, the distal end side portion 63 of the large-diameter portion 63 of the holding cylinder 6 is made. 1 abuts the side tube 8 1 . The connection surface between the large-diameter portion 63 and the push-out portion 65 is formed to have an obtuse angle of 90° or more, but is not processed into a thin-walled portion 66 of the tip end portion 62. Therefore, even the large-diameter portion 63 is formed. The front end side portion 631 abuts against the side tube 81, and the load is applied without any gap. Further, the discharge lamp is not broken by the notch of the holding cylinder 6 at the time of lighting, and the discharge lamp is not broken by the broken pieces, and the discharge lamp is broken in the lighting. The situation. Further, according to the second embodiment of the present invention, the diameter of the side tube 8 1 on the side of the light-emitting tube is made smaller than that of the holding cylinder 6, and the diameter of the side tube 8 1 around the metal plate 3 is made larger than The holding cylinder 6 is still small, and the pressure resistance of the discharge lamp can be improved. This is considered to be due to the following reasons. The pressure applied to the inside of the side pipe 81 of the radius r is proportional to the sectional area (Trr2) thereof. With respect to the applied pressure, the pressure resistance that does not break the seal 8 is proportional to the circumferential length (4 π r) of the side tube 8 1 . Therefore, the smaller the diameter of the side pipe 81 is, the more the compressive strength is increased. As shown in Fig. 4, since the arc tube 82 is formed in a substantially spherical shape, the withstand voltage is increased. Therefore, the compressive strength of the sealing body 8 can be determined by the diameter of the side tube 81. In the inside of the side tube 81, the enclosed gas follows the gap -16 - (14) (14) 1354313 of the outer circumference of the electrode core rod 4 and the inner hole 67 of the holding cylinder 6, up to the metal plate 3, and thus The compressive strength can be considered from the arc tube of the side tube 81 to the metal plate 3. Since the holding cylinder 6 and the side pipe 81 are hermetically sealed, the sealing gas is present on the side of the arc tube of the holding cylinder 6 of the side pipe 81, and the inner hole 67 of the cylindrical body 6 is held, and the metal plate 3 is held. Surroundings. Since the diameter of the inner hole 67 of the holding cylinder 6 is significantly smaller than the others, the pressure resistance is determined, and the outer diameter of the holding cylinder 6 of the side tube 81 on the side of the arc tube is the metal or the metal. The outer diameter of the plate 3. In the second embodiment, the glass member 1 has an outer peripheral surface 14 having a slightly thinned shape in a portion continuous to the end surface 11 on the side of the arc tube, and the periphery of the metal plate 3 is reduced in diameter. The holding cylinder 6 is formed with a rear end portion 61 continuous on the side of the glass member 1, and the inclined surface 68 of the arc tube side gradually becomes a large diameter. However, the front end portion 62 is formed by the small diameter portion 64 via the push-out portion 65. Reduced diameter. Thereby, the outer diameter of the holding cylinder 6 of the side pipe 81 on the side of the arc tube can be made small. Hereinafter, a third embodiment of the present invention will be described. Fig. 6 is an enlarged sectional view showing a discharge lamp of the present invention. In the discharge lamp of the sixth embodiment, in the discharge lamp of the second embodiment, the rear end portion 61 of the holding cylinder 6 is processed into a push-out shape, and the inner diameter thereof is smaller than the front end surface of the glass member 1. The outer diameter is also large, and the rear end of the holding cylinder 6 is formed to cover the front end of the glass member 1. The rear end portion 61 of the holding cylinder 6 is formed into a meandering shape, and the bottom portion is formed in a circular shape slightly larger than the outer diameter of the metal plate 3, and is formed to be gradually enlarged toward the outer end side of the side pipe 81. Pull out. Thus, the rear end portion 61 of the holding cylinder 6 is processed to be engaged with the front end of the -17-(15) (15) 1354313 glass member 1, and is formed to cover the glass member in which the metal foil 2 is disposed on the outer circumference. At the front end of the metal plate 3, the metal plate 3 is more firmly fixed, and the metal foil 2 is not easily pulled, and thus is not easily cut. When the rear end of the holding cylinder 6 is not formed to cover the front end of the glass member 1, the fixing of the metal plate 3 is not strong. Therefore, when the electrode 9 is extremely heavy, the metal plate 3 is inclined for the axial direction of the side tube 81 in the radial direction for the self-weight of the electrode 9. It is considered that the metal foil 2 which is connected to the upper side in the axial direction from the center of the metal plate 3 is cut and extended to be cut, and the metal foil 2 which is connected to the lower side in the axial direction from the center of the metal plate 3 is wrinkled. The holding cylinder 6 has D1 as the diameter of the small diameter portion 64, D2 as the diameter of the large diameter portion 63, and L! as the length in the axial direction from the small diameter portion 64 to the push portion 65, and takes L2 as From the large-diameter portion 63 of the holding cylinder 6 to the glass member 1, the length in the axial direction from the outside of the rod holding cylinder 7 is introduced, so that 02-0^61^/1^ can be formed. The holding cylinder 6 is formed by the small diameter portion 64 on the side of the arc tube, the large diameter portion 63 on the side of the glass member, and the push portion 65 connecting the small diameter portion 64 and the large diameter portion 63. Therefore, when the conductive portion of the package in the side tube 81 is inclined downward in the radial direction with respect to the axial direction in the axial direction, the distal end side portion 63 1 of the large diameter portion 63 of the holding cylinder 6 abuts against the side tube 81. The connection surface between the large-diameter portion 63 and the push-out portion 65 is formed as an obtuse angle of 90° or more, but is not processed into a thin-walled portion 66 of the tip end portion 62. Therefore, even the large-diameter portion 63 is formed. The front end side portion 631 abuts against the side tube 81, and the load is applied without any gap. Further, there is no crack in the notch of the holding cylinder 6 at the time of lighting, and the discharge lamp is broken, and there is no fragmentation by cracking -18-(16) (16) 1354313 and the enclosure 8, in the case of lighting, the discharge lamp is broken. Further, the holding cylinder 6 has a large diameter portion 63 formed in the rear end portion 61 on the side of the glass member 1, but the distal end portion 62 is reduced in diameter by being formed into the small diameter portion 64 via the push portion 65. Thereby, the outer diameter of the holding portion of the side tube 81 on the side of the light-emitting tube can be reduced, and the withstand voltage of the discharge lamp can be improved. [FIG. 1] FIG. 1 is a view showing the discharge lamp of the present invention. Use a sectional view. Fig. 2 is an enlarged sectional view showing a discharge lamp of the present invention. Fig. 3 is a view for explaining the shape of the holding cylinder of the present invention. Fig. 4 is an enlarged sectional view showing a discharge lamp of the present invention. Fig. 5 is a view for explaining the shape of the holding cylinder of the present invention. Fig. 6 is an enlarged sectional view showing a discharge lamp of the present invention. Fig. 7 is a cross-sectional view showing the conventional discharge lamp. Fig. 8 is an enlarged sectional view showing a conventional discharge lamp. [Description of main component symbols] 1 : Glass member, 1 1 : front end face, 12 : rear end face, 13 : hole, 14 : push-out outer peripheral surface, 2: metal foil, 21 : front end portion, 22: rear end portion 3: metal plate, 4: electrode mandrel, 5: external lead bar, 51: metal member '6: retaining cylinder, 61: rear end, 62: front end, 63 -19- (17) 1354313: large Diameter, 63 1 : side, 64: small diameter, 65: push-out, 66 thin wall, 67: inner hole, 68: inclined surface, 7: external introduction rod retaining cylinder, 7 1 : rear end Department, 72: side, 8: body, 8 1 : side tube, : light tube, 9: electrode. With 82
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