201239945 六、發明說明： 【發明所屬之技術領域】 本發明係關於長弧型金屬鹵素燈者，尤其關於於發光 管內封入水銀及鐵等的金屬與鹵素的長弧型金屬鹵素燈者 【先前技術】 先前，於發光管內封入水銀、其他金屬、鹵素的長弧 型金屬鹵素燈，係作爲放射紫外線的燈，例如廣泛使用於 樹脂、接著劑、油墨、光阻劑的硬化及乾燥、熔融或者軟 化之各樣處理的用途。具體來說，藉由對於塗佈接著劑等 的被照射物（工件）照射紫外線，使化學反應產生來進行 處理。於日本特開2008-3 1 1 1 1 9號公報（專利文獻1 )等揭 示其構造。 於圖4揭示此長弧型金屬鹵素燈的先前例。圖4(A) 係燈整體的剖面圖，圖4 ( B )係封止部分的放大剖面圖。 如圖4所示，長弧型金屬鹵素燈係具備由發光部2與其 兩端之封止部3所構成的發光管1，於前述發光部2與封止 部3之間，設置有直徑從該發光部2朝向封止部3逐漸變小 的縮徑部4。 於前述發光部2內，封入水銀及其他金屬、鹵素等， 並且對向配置一對的電極5、5。 然後，以覆蓋該封止部3及前述縮徑部4之方式圓筒狀 基座6藉由接著劑7等安裝於前述封止部3。 -5- 201239945 然而，近年來，有強烈對於該等長弧型金屬鹵素燈的 降低環境負擔之要求，希望降低燈的使用電力。 根據此種背景，爲了降低使用電力，檢討出頻繁切換 投入電力而進行使用的點燈方法。 例如，有在照射工件時以通常點燈時的電力來點燈， 在工件搬送等的待機時將電力降低至其以下，在需要照射 時再次提升電力之進行點燈電力之切換的點燈方法（以下 稱爲 full · standby點燈）。 另一方面，根據環境問題，也有限制水銀之使用量的 要求，爲了因應此要求，針對降低水銀量的金屬鹵素燈， 如前述般頻繁進行電力切換，結果產生以下問題。 進行full · standby點燈時，發光管的封止部附近在通 常點燈（full點燈）時成爲600 °C，待機點燈（standby點 燈）時則爲400°C。 在發光管的內部，越接近兩端的封止部，離電弧也越 遠且有冷卻風，故溫度最低。 在通常點燈時，與待機點燈時以相同條件冷卻燈的話 ，在待機點燈時封止部會被過度冷卻，封入至內部的金屬 從蒸氣凝縮•凝固成液體或固體，故有再次回到通常點燈 時，到金屬蒸發爲止需要時間的問題。 於前述先前技術中，如圖4 ( B )所示，從發光管2端 部的縮徑部4放射之輻射光X係在基座6的內壁反射，而往 後方放射，並不會有助於發光管端部的加熱，無法避免在 該部位之封入金屬的凝固·凝縮。 -6- 201239945 〔先前技術文獻〕 〔專利文獻〕 〔專利文獻1〕日本特開2008-3 1 1 1 1 9號公報 【發明內容】 〔發明所欲解決之課題〕 本發明係有鑑於以上狀況所發明者，於具備由對向配 置一對的電極之發光部與設置於該發光部兩端之封止部所 構成的發光管，於前述發光部與封止部之間設置縮徑部， 並具有至少覆蓋該縮徑部之圓筒狀基座的長弧型金屬鹵素 燈中，提供在full· standby點燈之standby點燈時不會發生 因冷卻風而縮徑部內封入金屬凝縮或凝固之狀況的構造。 〔用以解決課題之手段〕 爲了解決前述課題，關於此發明的長弧型金屬鹵素燈 的特徵爲：前述縮徑部，係具有與前述圓筒狀基座同心狀 的圓筒狀部。 又’特徵爲：前述縮徑部，係燈的管軸方向之該縮徑 部的圓筒狀部之長度的合計，比該縮徑部的圓筒狀部以外 之部分的長度的合計還大。 〔發明的效果〕 依據本發明，藉由於縮徑部形成與圓筒狀基座同心狀 -7- 201239945 的圓筒狀部，從該縮徑部放射之熱藉由基座反射而再次回 到縮徑部’藉此’該縮徑部被加熱，故可防止在此內部中 封入金屬凝縮或凝固。 【實施方式】 於圖1揭示本發明之長弧型金屬鹵素燈的整體圖，於 圖2揭不其縮徑部分的放大圖。 長弧型金屬鹵素燈係具有由發光部2與其兩端之封止 部3、3所構成的發光管1，從發光部2涵蓋至封止部3，形 成有縮徑部10，於該縮徑部10，形成與包圍其之圓筒狀基 座6同心狀的複數圓筒狀部11a、lib。 該等圓筒狀部11a、lib的管軸方向之長度的合計，係 以比其以外，亦即，非圓筒狀部12a、12b、12c之長度的 合計還大之方式形成。 藉由設爲此種構造，如圖2所示，從縮徑部10的圓筒 狀部11放射之輻射光Y係對於管軸垂直，故對於基座6的內 壁直角照射，其反射光Z也往管軸垂直反射，回到縮徑部 1 1 〇 藉此，發光部2的縮徑部10附近係藉由此反射光加熱 ，不會產生發光部2內的封入金屬凝縮之狀況。 進行證實本發明之效果的實驗，並於圖3的圖表揭示 其結果。 首先，實驗所使用之長弧型金屬鹵素燈，係發光管外 徑爲Φ 26mm，發光長度爲1100mm，額定電力爲18kW，燈 201239945 輸入電壓爲160W/cm，封入物係水銀爲1.0//mol/cc，鐵爲 0.2/imol/cc，姚爲 〇.4//mol/cc，並封入氣氣 50torr 者。 作成於此燈的縮徑部形成圓筒狀部之圖1、圖2的本發 明之燈，與不設置圓筒狀部而設爲R形狀之圖4所示之先前 之燈，以圖1所示之3個地方的測定點進行溫度測定。亦即 ，在發光部的中央部（A)(發光部溫度）、電極前端的 正上端部（B)(端部溫度）、封止部與發光部的接合部 (C )(肩部溫度）的3處進行測定。 於圖3揭示其結果，在本發明之燈中，端部溫度比先 前之燈的相同地方之溫度還高7〇°C程度，證實保溫功能已 提升。 又，該端部溫度（923 °C )比發光部溫度（860°C )還 高，證實可防止金屬鹵素進入該部分。 如以上所說明，在本發明的長弧型金屬鹵素燈中，於 發光管的發光部與封止部之間，形成與圓筒狀基座同心狀 的圓筒狀部，故來自該縮徑部的輻射光藉由基座反射而再 次回到縮徑部，使該部分保溫，故防止封入至發光管內的 金屬之蒸氣侵入該部分，可防止在該處產生凝固·凝縮。 爲此，因爲封入金屬全部蒸發而有助於發光，故可獲 得所希望的發光。 【圖式簡單說明】 〔圖1〕本發明之長弧型金屬鹵素燈的剖面圖。 〔圖2〕圖1之封止部附近部分的放大剖面圖。 201239945 〔圖3〕揭示本發明之效果的圖表。 〔圖4〕先前技術的剖面圖，（A )係整體剖面圖，（ B )係部分剖面圖。 【主要元件符號說明】 1 :發光管 2 :發光部 3 :封止部 5 :電極 6 :基座 1 〇 :縮徑部 11a、lib:圓筒狀部 Y :輻射光 Z :反射光 -10-201239945 VI. Description of the Invention: [Technical Field] The present invention relates to a long arc type metal halide lamp, and more particularly to a long arc type metal halide lamp in which a metal and a halogen such as mercury and iron are enclosed in an arc tube. Technology] A long-arc metal halide lamp in which mercury, other metals, and halogens are sealed in an arc tube is used as a lamp for emitting ultraviolet rays, for example, it is widely used for hardening, drying, and melting of resins, adhesives, inks, and photoresists. Or soften the use of various treatments. Specifically, the object to be irradiated (workpiece) such as an adhesive is irradiated with ultraviolet rays to cause a chemical reaction to be generated. The structure is disclosed in Japanese Laid-Open Patent Publication No. 2008-3 1 1 1 9 (Patent Document 1). A previous example of this long arc type metal halide lamp is disclosed in FIG. Fig. 4(A) is a cross-sectional view of the entire lamp, and Fig. 4(B) is an enlarged cross-sectional view of the sealing portion. As shown in FIG. 4, the long arc type metal halide lamp includes an arc tube 1 composed of a light-emitting portion 2 and a sealing portion 3 at both ends thereof, and a diameter is provided between the light-emitting portion 2 and the sealing portion 3 The light-emitting portion 2 is gradually reduced in size toward the sealing portion 3. In the light-emitting portion 2, mercury, another metal, a halogen, or the like is sealed, and a pair of electrodes 5 and 5 are disposed opposite to each other. Then, the cylindrical base 6 is attached to the sealing portion 3 by an adhesive 7 or the like so as to cover the sealing portion 3 and the reduced diameter portion 4. -5- 201239945 However, in recent years, there has been a strong demand for lowering the environmental burden of these long-arc metal halide lamps, and it is desired to reduce the power consumption of the lamps. According to this background, in order to reduce the use of electric power, a lighting method in which the input electric power is frequently switched and used is reviewed. For example, there is a lighting method in which the electric power is turned on when the workpiece is irradiated, and the electric power is turned on below when the workpiece is conveyed or the like, and the lighting power is switched again when the electric power is required to be irradiated again. (hereinafter referred to as full · standby lighting). On the other hand, in response to environmental problems, there is a demand for limiting the amount of use of mercury. In response to this request, the metal halide lamp for reducing the amount of mercury is frequently switched as described above, and as a result, the following problems occur. When full • standby is turned on, the vicinity of the blocking portion of the arc tube is 600 °C when it is normally lit (full lighting), and 400 °C when it is standby lighting (standby lighting). In the interior of the arc tube, the closer to the sealing portion at both ends, the farther away from the arc and the cooling wind, so the temperature is lowest. When the lamp is normally turned on, and the lamp is cooled under the same conditions as in the standby lighting, the sealing portion is excessively cooled during standby lighting, and the metal sealed inside is condensed from the vapor and solidified into a liquid or a solid, so that it is returned again. When it is usually lit, it takes time to evaporate the metal. In the foregoing prior art, as shown in FIG. 4(B), the radiant light X radiated from the reduced diameter portion 4 at the end of the arc tube 2 is reflected on the inner wall of the susceptor 6, and is radiated to the rear, and there is no It contributes to the heating of the end portion of the arc tube, and the solidification and condensation of the enclosed metal at the portion cannot be avoided. -6-201239945 [Prior Art Document] [Patent Document 1] [Patent Document 1] JP-A-2008-3 1 1 1 1 9 SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] The present invention has been made in view of the above circumstances. In the inventors, the light-emitting tube including the light-emitting portion of the pair of electrodes disposed opposite to each other and the sealing portion provided at both ends of the light-emitting portion is provided with a reduced-diameter portion between the light-emitting portion and the sealing portion. In the long-arc metal halide lamp having at least the cylindrical base covering the reduced diameter portion, it is provided that the metal is condensed or solidified in the reduced diameter portion due to the cooling wind when the standby lighting of the full· standby lighting is performed. The construction of the situation. [Means for Solving the Problem] The long arc type metal halide lamp according to the present invention is characterized in that the reduced diameter portion has a cylindrical portion concentric with the cylindrical base. Further, the total length of the cylindrical portion of the reduced diameter portion in the tube axis direction of the lamp is larger than the total length of the portion other than the cylindrical portion of the reduced diameter portion. . [Effects of the Invention] According to the present invention, since the reduced diameter portion forms a cylindrical portion concentric with the cylindrical base -7-201239945, the heat radiated from the reduced diameter portion is returned to the base by reflection. Since the reduced diameter portion 'by this' the reduced diameter portion is heated, it is possible to prevent the metal from being condensed or solidified in the inside. [Embodiment] An overall view of a long arc type metal halide lamp of the present invention is disclosed in Fig. 1, and an enlarged view of a reduced diameter portion thereof is shown in Fig. 2. The long arc type metal halide lamp has an arc tube 1 composed of the light-emitting portion 2 and the sealing portions 3 and 3 at both ends thereof, and the light-receiving portion 2 covers the sealing portion 3, and the reduced-diameter portion 10 is formed. The diameter portion 10 is formed with a plurality of cylindrical portions 11a and 11b which are concentric with the cylindrical base 6 surrounding the diameter. The total length of the cylindrical portions 11a and 11b in the tube axis direction is formed to be larger than the total length of the non-cylindrical portions 12a, 12b, and 12c. With such a configuration, as shown in FIG. 2, the radiant light Y radiated from the cylindrical portion 11 of the reduced diameter portion 10 is perpendicular to the tube axis, so that the inner wall of the susceptor 6 is irradiated at right angles, and the reflected light is reflected. Z is also vertically reflected toward the tube axis, and returns to the reduced diameter portion 1 1 , whereby the vicinity of the reduced diameter portion 10 of the light-emitting portion 2 is heated by the reflected light, and the sealed metal in the light-emitting portion 2 does not collapse. Experiments demonstrating the effects of the present invention were carried out, and the results are revealed in the graph of Fig. 3. First of all, the long-arc metal halide lamp used in the experiment is the outer diameter of the luminous tube is Φ 26mm, the luminous length is 1100mm, the rated power is 18kW, the input voltage of the 201239945 is 160W/cm, and the sealed mercury is 1.0//mol. /cc, iron is 0.2/imol/cc, Yao is 〇.4//mol/cc, and the gas is 50torr. The lamp of the present invention in which the reduced-diameter portion of the lamp is formed into a cylindrical portion, and the lamp of the present invention in FIG. 2 and the cylindrical portion are provided in an R-shape, as shown in FIG. Temperature measurement was performed at the measurement points of the three places shown. That is, the central portion (A) (light-emitting portion temperature) of the light-emitting portion, the upper end portion (B) of the electrode tip (end portion temperature), and the joint portion (C) of the light-emitting portion (shoulder temperature) The measurement was carried out at three places. As a result, as shown in Fig. 3, in the lamp of the present invention, the end temperature was about 7 ° C higher than the temperature of the same place of the preceding lamp, and it was confirmed that the heat retaining function was improved. Further, the end temperature (923 ° C) was higher than the temperature of the light-emitting portion (860 ° C), and it was confirmed that metal halogen was prevented from entering the portion. As described above, in the long arc type metal halide lamp of the present invention, a cylindrical portion concentric with the cylindrical base is formed between the light emitting portion and the sealing portion of the arc tube, and thus the diameter is reduced. The radiation of the portion is returned to the reduced diameter portion by the reflection of the susceptor, and the portion is kept warm. Therefore, the vapor of the metal enclosed in the arc tube is prevented from entering the portion, and solidification and condensation can be prevented from occurring there. For this reason, since the enclosed metal is all evaporated to contribute to light emission, desired light emission can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS [Fig. 1] A cross-sectional view of a long arc type metal halide lamp of the present invention. Fig. 2 is an enlarged cross-sectional view showing a portion in the vicinity of the sealing portion of Fig. 1. 201239945 [Fig. 3] A graph showing the effects of the present invention. [Fig. 4] A cross-sectional view of the prior art, (A) is an overall cross-sectional view, and (B) is a partial cross-sectional view. [Description of main component symbols] 1 : Light-emitting tube 2 : Light-emitting portion 3 : Sealing portion 5 : Electrode 6 : Base 1 〇 : Reduced diameter portion 11 a, lib: Cylindrical portion Y : Radiated light Z : Reflected light - 10 -