201112308 六、發明說明： 【發明所屬之技術領域】 本發明是關於長弧型放電燈，尤其是，關於封入有水 銀或水銀以外的金屬，及鹵素，兩端藉由箔密封構造被密 封的長弧型放電燈者。 【先前技術】 傳統上，封入有水銀或水銀以外的金屬，及鹵素的長 弧型放電燈，例如金屬鹵化物燈，是作爲放射紫外線的放 電燈，例如廣泛地被使用在樹脂、接著劑、油墨、光阻的 硬化、乾燥、熔融、或軟化的各種處理的用途。 此種長弧型放電燈，一般爲石英玻璃所成的發光管及 其兩端的密封部所構成，在該密封部內埋設有金屬箔，而 在該金屬箔具有連接有鎢所成的電極的構造者。 在密封部構造有各種者，惟眾知有將板狀或扁平形狀 的玻璃構件埋設於該密封部內，而利用該玻璃構件來密封 者。 在該構造中，電極的密封部側後端爲扁平地被形成， 而且在其後端側配設有板狀或扁平玻璃構件，上述金屬箔 是被接合於該電極的扁平部的上下面，朝著玻璃構件的上 下面延伸，而在其後端與外部引線接合。 在日本特開2006-134710號公報揭示著此種構造的長 弧型放電燈，在該燈中，有所定量的稀有氣體，及鹵素， 及水銀，及鐵被封入在上述發光管的內部，而在點燈時主^ -5- 201112308 要可照射波長365nm附近的紫外線者。 又，在此專利文獻中，記載在電極的胴部形成小徑的 部位，以防止密封部側的鹵素會凝固的發明。 可是，在此種長弧型放電燈中，如上述地，密封部近 旁是來自電弧的距離變大之故，因而與發光部相比較，溫 度必定變低而鹵素不容易聚合。又，此種燈是一般爲動作 時的壓力比大氣壓還要高，使得鹵素容易進到密封部的內 部。 密封部的鉬箔的溫度是依燈的設計或冷卻條件有所不 同，惟至少成爲500°C以上，成爲進行者鉬與鹵素的反應 的狀況，而密封構件的鉬所成的金屬箔不久被鹵素侵蝕， 密接鉬與石英玻璃的介面藉由高壓會與玻璃剝離，而發生 所謂「箔浮起」現象。又，再進行此箔浮起，則最後成爲 燈內的封入物流出（泄漏）至外部的原因，而產生內部水 銀流出等不期望的現象。 此種泄漏的原因是主要在於點燈時的動作壓。在此種 長弧型放電燈，針對於發光長爲50cm以上者，燈輸入是 成爲80W/Cm以上，因此成爲至少4kW以上的高輸入燈。所 以，點燈時是封入物完全地蒸發而被動作，其動作壓是至 少1 atm以上，相當於被稱爲所謂高壓放電燈者。在此些燈 中，成爲該動作壓經常地施加於密封部。 專利文獻1:日本特開2006- 1 347 1 0號公報 【發明內容】 -6- 201112308 本發明是鑑於上述傳統技術的問題，提供一種在發光 管內相對配置有一對電極，該發光管是在兩端利用箔密封 構造進行密封所成的長弧型放電燈，不會有被封入於發光 管內的鹵素進到密封部內而侵蝕金屬箔，或是藉由該鹵素 發生箔浮起使得封入物流出至外部的長弧型放電燈。 爲了解決上述課題，在本發明的長弧型放電燈，電位 梯度爲8V/cm以下，燈輸入電力爲80W/cm以上，發光長爲 5 Ocm以上，封入物是水銀或水銀以外的金屬，及鹵素之 組合’具有波長45 Onm以下的光的放射，點燈時的動作壓 成爲負壓，爲其特徵者。 又’更佳爲電位梯度爲8V/cm以下，點燈時的動作壓 爲5 OkP a以下，爲其特徵者，還有，上述箔密封構造爲兩 枚箔，爲其特徵者》 依照本發明，雖對於長弧型放電燈有高輸入。惟點燈 時的動作壓成爲不足1 atm的負壓之故，因而發光管內的封 入物’尤其是鹵素不會侵入至密封部內，因此，發揮不會 有金屬箔的腐蝕，發生箔浮起，或封入物流出至外部的效 果。結果，成爲可延長燈的壽命。 可是’爲了將動作壓作成負壓，必須將水銀等的封入 量設定較少’藉此’電位梯度（電壓）抑制成低而電流成 爲增加。若該燈電流增加，則爲了增加鉬箔的電流容量必 須增加筢厚度，或增加寬度。 又’作爲增加電流容量的方法，也有增加鉬箔的枚數 的方法。然而，增加鉬箔的枚數的方法是增加鉬箔與電極 I" 201112308 之熔接部位，在鉬箔之間也必須放進玻璃構件，而形成於 電極周圍的微小空間會變大，使得鹵素容易侵入至其空間 而容易發生箔浮起。所以，兩枚箔以上的構造是主要使用 在未封入鹵素的氙燈或短弧的超高壓水銀燈，在放入鹵素 的燈通常是1枚鉬箔來進行密封。 對此，在本發明中，如上述地，發光管內部在點燈時 也成爲負壓，比通常的高壓放電燈不容易產生在密封部的 箔浮起的優越性，可採用兩枚箔以上的構造，而可正確地 對應於電流容量的增加。 【實施方式】 第1圖是表示本發明的長弧型放電燈，而第2圖是其主 要部分的擴大圖。在圖中，長弧型放電燈1是石英玻璃所 成的發光管2的兩端具備密封部3，在該發光管2內隔著所 定距離，例如500mm相對配置有一對電極4、4。 在此實施例中，上述電極4的非發光空間側的後端4 a ，是被形成扁平形狀，而在其後方端，配設有配合該電極 後端4a的形狀作成扁平形狀的石英玻璃構件6。 在密封部3內，藉由熔接等被接合於上述電極4的扁平 後端4a的上下面的兩枚金屬箔5、5，是沿著玻璃構件6的 上下面延伸，而在其後方端被連接於外部引線7。該外部 引線7是突出於發光管2的外部’被連接於未圖示的饋電線 〇 在上述發光管2內，封入有所定的稀有氣體，及鹵素 -8 - 201112308 ’及水銀，及鐵，在此例中’在點燈時，例如主要放射波 長365nm附近的紫外線。 又’封入物是並不被限定於上述，A :水銀或水銀以 外的金屬+ B:鹵素的全組合都可以。 作爲此些組合的例子有如以下者。 • Hg< 水銀 >+ (1< 碘〉、81"<溴>) • Zn (鋅）+ (1、Br) • Zn+Fel2< 峨化鐵 > • H g + F e 12 •金屬 α (81<秘>、81»<鋪>+ (I、Br) 此些發光物質被封入使得燈的電位梯度成爲8V/cm以 下。 又，作爲用以提昇起動性的稀有氣體，例如封入有氙 〇 還有’鞯由電極間距離所決定的發光長是500mm以上 ，而燈輸入電力是80W/Cm以上。 封入上述發光物質的燈，是主要放射波長3 40〜 4 5 Onm的紫外線者，作爲其用途，例如被使用於樹脂、接 著劑、油墨、光阻的硬化、或乾燥、熔融、或是軟化的各 種處理。 針對於實施例表示於以下。 在第3圖表示供作實驗的各種長弧型放電燈，各燈是 發光管的形狀、尺寸、密封部構造、發光長等是共通，而 封入物與點燈時的電壓、動作壓爲不相同者。 -9 - 201112308 表示於實施例1的燈，是使用中央部分的內徑爲22mir ’內容積爲400cm3的發光管’而水銀i 30mg、碘化水銀 l〇mg及氙氣體的封入壓成爲SkPa的方式被封入，在 1，000mm的電極間距離，配置有電極4的放電燈，額定點 力 16,000W，燈電壓 795V。 表示於實施例2的燈，是使用中央部分的內徑，內容 積與實施例1的燈相同的發光管，水銀7 3 m g '碘化水銀 2mg及氙氣體的封入壓成爲4kPa的方式被封入，與實施例 1相同，額定點力1 6,000W的燈，惟燈電壓是5 8 5 V。 表示於習知例的燈，是使用中央部分的內徑，內容積 爲與實施例1的燈相同的發光管，水銀825mg、碘化水銀 2mg及氙氣體的封入壓成爲4kPa的方式被封入，與實施例 1相同，額定點力1 6,000W的燈，惟燈電壓是1，3 5 7V。 又，上述傳統例的燈的電位梯度爲1 3 · 6 ( V/cm )，對 此，在本發明的實施例1的燈，電位梯度爲7.95 ( V/cm ) ，在實施例2的燈爲5.85 ( V/cm )較小。 與此有關地，查證各燈的動作壓，以燈內部的平均氣 體溫度作爲2,00 0K時的水銀、碘、及氙的各個壓力，以 “氣體的狀態方程式” ：P = nRT/V 但、P :動作壓、 η :莫耳數、 R :氣體常數、 Τ :絕對溫度=平均氣體溫度、 V :燈內容積 -10- 201112308 求出，合計此些以求得動作壓。 如此所求得的動作壓’在習知例爲1 · 9 0 ( a tm ) ’對 此，本發明的實施例1爲0.81 (atm) ’而在實施例2爲 0.4 1 ( atm )，而在本發明的任一燈中，可知燈內部是在 點燈狀態也成爲負壓。 第4圖是進行上述各燈的壽命點燈試驗，針對於照度 維持率予以標示的圖表。縱軸是對於初期照度的照度維持 率（％ ) ’橫軸是經過時間。 由實驗結果，各燈是經過點燈，同時在點燈時間大約 同樣地降低照度。然而，首先，習知例的燈爲點燈時間 4,50 0小時近旁，從密封部泄漏，惟實施例1、2是其後， 降低照度一面也維持點燈。尤其是實施例2是超過8,000小 時還維持點燈。在實施例2的燈中，可能點燈時的燈的內 壓更低之故，因而延遲箔浮起的進行行者。又，在泄漏時 與泄漏大約同時地有大氣流進燈內部，而成爲無法進行點 燈，幾乎未看到封入物流出至外部。 此些是起因於封入鹵素的燈的點燈時的動作壓的問題 ，與有無水銀無關，即使放進鹵素與金屬時也可看到同樣 的趨勢。 如以上所述地，即使在具有相同發光管形狀，密封部 構造的燈’對於發光管內的動作壓成爲大氣壓以上習知燈 ’對此’在動作壓成爲不足大氣壓的負壓的本發明的燈， 會長久時間地抑制發生密封部的封入物質的泄漏，可知得 - - - .· -. 到大幅度長壽命化。 -11 - 201112308 【圖式簡單說明】 第1圖是本發明的長弧型放電燈的全體圖。 第2圖是第1圖的局部斷面圖。 第3圖是供作實驗的各種燈。 第4圖是表示第3圖的各種燈的照度維持率的圖表。 【主要元件符號說明】 1 :長弧型放電燈 2 :發光管 3 :密封部 4 :電極 4a :扁平的電極後端 5 :金屬箔 6 :玻璃構件 7 :外部引線 -12-201112308 VI. Description of the Invention: [Technical Field] The present invention relates to a long arc discharge lamp, and more particularly to a metal sealed with mercury or mercury, and a halogen, which is sealed at both ends by a foil sealing structure. Arc discharge lamp. [Prior Art] Conventionally, a long arc discharge lamp in which a metal other than mercury or mercury and a halogen, such as a metal halide lamp, is used as a discharge lamp that emits ultraviolet rays, for example, is widely used in a resin, an adhesive, Use of various treatments for curing, drying, melting, or softening of inks and photoresists. Such a long arc type discharge lamp is generally composed of an arc tube made of quartz glass and a sealing portion at both ends thereof, and a metal foil is embedded in the sealing portion, and the metal foil has a structure in which an electrode made of tungsten is connected. By. There are various structures in the seal portion. However, it is known that a plate member or a flat glass member is embedded in the seal portion, and the glass member is used to seal the member. In this configuration, the rear end of the sealing portion side of the electrode is formed flat, and a plate-like or flat glass member is disposed on the rear end side thereof, and the metal foil is bonded to the upper and lower surfaces of the flat portion of the electrode. It extends toward the upper and lower faces of the glass member and is joined to the outer leads at its rear end. A long arc type discharge lamp of such a configuration is disclosed in Japanese Laid-Open Patent Publication No. 2006-134710, in which a certain amount of rare gas, halogen, mercury, and iron are enclosed in the inside of the above-mentioned light-emitting tube. At the time of lighting, the main ^ -5- 201112308 should be able to illuminate ultraviolet rays near the wavelength of 365 nm. Further, this patent document describes an invention in which a portion having a small diameter is formed in the crotch portion of the electrode to prevent solidification of the halogen on the side of the sealing portion. However, in such a long arc type discharge lamp, as described above, since the distance from the arc is increased in the vicinity of the sealing portion, the temperature is necessarily lowered and the halogen is not easily polymerized as compared with the light-emitting portion. Further, such a lamp is generally operated at a pressure higher than atmospheric pressure so that the halogen easily enters the inside of the sealing portion. The temperature of the molybdenum foil in the sealing portion differs depending on the design or cooling conditions of the lamp, but at least 500 ° C or higher, the reaction between the molybdenum and the halogen is progressed, and the metal foil formed by the molybdenum of the sealing member is soon The halogen is eroded, and the interface between the close-packed molybdenum and the quartz glass is peeled off from the glass by high pressure, and a so-called "foil float" phenomenon occurs. Further, when the foil is floated again, the sealing in the lamp is discharged (leaked) to the outside, and an undesired phenomenon such as internal mercury outflow occurs. The reason for this leakage is mainly the operating pressure at the time of lighting. In such a long arc type discharge lamp, when the light emission length is 50 cm or more, the lamp input is 80 W/cm or more, and therefore, it is a high input lamp of at least 4 kW or more. Therefore, when the lamp is turned on, the enclosure is completely evaporated and operated, and the operating pressure is at least 1 atm or more, which corresponds to what is called a so-called high-pressure discharge lamp. In these lamps, the operating pressure is often applied to the sealing portion. Patent Document 1: Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. 2006- 1 347 No. 1 00-201112308 The present invention provides a pair of electrodes disposed oppositely in an arc tube in view of the problems of the above conventional techniques. The long arc type discharge lamp formed by sealing the both ends by the foil sealing structure does not have the halogen enclosed in the arc tube enter the sealing portion to erode the metal foil, or the foil is floated by the halogen to make the sealed flow Long arc discharge lamp to the outside. In order to solve the above problem, in the long arc type discharge lamp of the present invention, the potential gradient is 8 V/cm or less, the lamp input power is 80 W/cm or more, and the light emission length is 5 Ocm or more, and the enclosure is a metal other than mercury or mercury, and The combination of halogens has a wavelength of 45 Onm or less, and the operating pressure at the time of lighting becomes a negative pressure. Further, it is preferable that the potential gradient is 8 V/cm or less, and the operating pressure at the time of lighting is 5 OkPa or less, and the foil sealing structure is a two-piece foil, which is characterized by the present invention. Although there is a high input for long arc discharge lamps. However, since the operating pressure at the time of lighting becomes a negative pressure of less than 1 atm, the sealing material in the arc tube, in particular, the halogen does not intrude into the sealing portion, so that corrosion of the metal foil does not occur, and foil floating occurs. , or the effect of being sealed out to the outside. As a result, the life of the lamp can be extended. However, in order to press the operation into a negative pressure, it is necessary to set the sealing amount of mercury or the like to be small, and the potential gradient (voltage) is suppressed to be low and the current is increased. If the lamp current is increased, in order to increase the current capacity of the molybdenum foil, it is necessary to increase the thickness of the crucible or increase the width. Further, as a method of increasing the current capacity, there is also a method of increasing the number of molybdenum foils. However, the method of increasing the number of molybdenum foils is to increase the fusion joint between the molybdenum foil and the electrode I" 201112308, and the glass member must also be placed between the molybdenum foils, and the minute space formed around the electrodes becomes large, making the halogen easy. Intrusion into its space is prone to foil floating. Therefore, the structure of two or more foils is mainly used for a xenon lamp or a short arc ultrahigh pressure mercury lamp in which a halogen is not sealed, and a halogen lamp is usually sealed with a molybdenum foil. On the other hand, in the present invention, as described above, the inside of the arc tube also becomes a negative pressure at the time of lighting, and the foil of the sealing portion is less likely to float than the normal high-pressure discharge lamp, and two or more foils can be used. The configuration can correctly correspond to the increase in current capacity. [Embodiment] Fig. 1 is a long arc type discharge lamp of the present invention, and Fig. 2 is an enlarged view of a main part thereof. In the figure, the arc-shaped discharge lamp 1 is provided with quartz glass, and both ends of the arc tube 2 are provided with a sealing portion 3. In the arc tube 2, a pair of electrodes 4 and 4 are disposed opposite each other with a predetermined distance therebetween, for example, 500 mm. In this embodiment, the rear end 4 a of the non-light-emitting space side of the electrode 4 is formed into a flat shape, and at the rear end thereof, a quartz glass member which is formed into a flat shape in conformity with the shape of the rear end 4 a of the electrode is disposed. 6. In the sealing portion 3, the two metal foils 5, 5 joined to the upper and lower surfaces of the flat rear end 4a of the electrode 4 by welding or the like extend along the upper and lower surfaces of the glass member 6, and are at the rear end thereof. Connected to the outer lead 7. The external lead 7 protrudes from the outside of the arc tube 2 and is connected to a feeder (not shown) in the arc tube 2, and encloses a predetermined rare gas, and halogen-8 - 201112308 'and mercury, and iron, In this example, when lighting, for example, ultraviolet rays having a wavelength of around 365 nm are mainly emitted. Further, the enclosure is not limited to the above, and A: a combination of metal other than mercury or mercury + B: halogen may be used. Examples of such combinations are as follows. • Hg<Mercury>+(1<iodine>,81"<bromine>) • Zn (zinc)+ (1, Br) • Zn+Fel2<峨化铁> • H g + F e 12 • Metal α (81 < Secret >, 81 » < Paving > + (I, Br) These luminescent substances are enclosed so that the potential gradient of the lamp becomes 8 V/cm or less. Also, as a rare gas for improving startability For example, the illuminating length determined by the distance between the electrodes is 500 mm or more, and the lamp input power is 80 W/cm or more. The lamp in which the above luminescent substance is enclosed is the main emission wavelength 3 40 to 4 5 Onm. The ultraviolet ray is used for various applications such as curing of a resin, an adhesive, an ink, or a photoresist, or drying, melting, or softening, for example. The examples are shown below in the examples. Various long-arc discharge lamps for experiment, each lamp is common in the shape and size of the arc tube, the structure of the sealing portion, and the length of the light, and the voltage and the operating pressure of the sealed object and the lighting are not the same. 201112308 shows the lamp of the first embodiment, which uses the inner portion of the inner diameter of 22 mir' The discharge tube of the electrode 4 of 400 cm3 is sealed in such a manner that the sealing pressure of the mercury i 30 mg, the mercury iodide l〇mg and the helium gas is SkPa, and the discharge lamp of the electrode 4 is disposed at a distance of 1,000 mm between the electrodes, and the rated point is set. The force is 16,000 W, and the lamp voltage is 795 V. The lamp shown in Example 2 is an inner tube having the inner diameter of the central portion and having the same internal volume as that of the lamp of Example 1, mercury 7 3 mg '2 mg of mercury iodide and helium gas. The lamp was sealed in such a manner that the sealing pressure was 4 kPa, and the lamp having a rated point force of 1 6,000 W was the same as in the first embodiment, but the lamp voltage was 585 V. The lamp shown in the conventional example was the inner diameter of the center portion. The light-emitting tube having the same volume as that of the lamp of Example 1 was sealed so that 825 mg of mercury, 2 mg of mercury iodide, and a sealing pressure of helium gas were 4 kPa. The lamp having a rated point force of 1 6,000 W was the same as in the first embodiment. The voltage is 1, 3 5 7 V. Further, the potential gradient of the lamp of the above-described conventional example is 1 3 · 6 (V/cm), and in the lamp of the first embodiment of the present invention, the potential gradient is 7.95 (V/cm). The lamp in the second embodiment is 5.85 (V/cm). In connection with this, the lamps are verified. The operating pressure is the average gas temperature inside the lamp as the pressure of mercury, iodine, and helium at 2,00 0K, and the "state equation of gas": P = nRT/V, but P: action pressure, η: Mo Ear number, R: gas constant, Τ: absolute temperature = average gas temperature, V: lamp internal volume -10- 201112308 Find, sum up to obtain the operating pressure. The operation pressure 'measured as described above is 1 9000 (a tm )', and the first embodiment of the present invention is 0.81 (atm) ', and the second embodiment is 0.4 1 (atm ). In any of the lamps of the present invention, it is understood that the inside of the lamp also becomes a negative pressure in the lighting state. Fig. 4 is a graph showing the illuminance maintenance rate by performing the life lighting test of each of the above lamps. The vertical axis is the illuminance maintenance rate (%) for the initial illuminance. The horizontal axis is the elapsed time. From the experimental results, each lamp is lit and the illumination is reduced approximately at the same time. However, first, the lamp of the conventional example is near the lighting time of 4,50 hours, and leaks from the sealing portion. However, in the first and second embodiments, the lighting is maintained while the illuminance is lowered. In particular, Example 2 maintained lighting for more than 8,000 hours. In the lamp of the second embodiment, the internal pressure of the lamp at the time of lighting may be lower, thereby delaying the progress of the foil floating. Further, at the time of the leak, a large air current enters the inside of the lamp at about the same time as the leak, and it becomes impossible to perform the lighting, and the sealed flow is hardly seen to the outside. These are problems caused by the operating pressure at the time of lighting of a halogen-encapsulated lamp, and the same tendency is observed even when halogen and metal are placed regardless of the presence of mercury. As described above, even in the case of having the same light-emitting tube shape, the lamp of the seal portion structure has a pressure of more than atmospheric pressure for the operating pressure in the arc tube, and the present invention has a negative pressure of less than atmospheric pressure at the operating pressure. The lamp can suppress the leakage of the sealed substance in the sealed portion for a long time, and it is known that the - - - - - - - - has a long life. -11 - 201112308 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a general view of a long arc discharge lamp of the present invention. Fig. 2 is a partial cross-sectional view of Fig. 1. Figure 3 is a variety of lamps for experimentation. Fig. 4 is a graph showing the illuminance maintenance ratio of the various lamps of Fig. 3. [Main component symbol description] 1 : Long arc discharge lamp 2 : Illuminated tube 3 : Sealing part 4 : Electrode 4a : Flat electrode rear end 5 : Metal foil 6 : Glass member 7 : External lead -12-