201101367 六、發明說明 【發明所屬之技術領域】 本發明是關於例如使用作爲液晶顯示裝置等的後照光 裝置的光源的外部電極型稀有氣體螢光燈及後照光用稀有 氣體螢光燈單元。 【先前技術】 〇 例如，作爲液晶顯示面板的後照光用光源，因可得到 高亮度，且有效率地發光，因此例如廣泛地使用著冷陰極 螢光燈（CCFL)。 冷陰極螢光燈的某些種類者，作成具備螢光被膜設於 內面的直管狀燈泡，一對電極相對配置而起微量水銀封入 於此燈泡內的管軸方向兩端部位置所成，藉由依放電所激 勵的水銀所發生的紫外線，俾發光螢光體的構成，例如複 數支者二維地並聯配置成燈中心軸互相平行地延伸，構成 〇 著後照光用燈單元。 而且，一般液晶顯示面板等的畫面亮度，是因應於周 圍的明亮，使用者的嗜好，畫像資訊等而可調節成適當的 大小，惟近年來，調整此種畫面亮度，是藉由後照光用光 源側的調光所進行（局部減少（L o c a 1 D i m m i n g)，以下以 「LD」表示）。 在藉由LD進行液晶顯示面扳等的畫面亮度時，作爲 後照光用燈單元，被要求可進行燈的軸方向的調光的構成 者。 -5- 201101367 然而，例如並聯配置著複數冷陰極螢光燈所成的燈單 元，冷陰極螢光燈必須放電至放電空間中的軸方向全體全 面而在燈軸方向無法做放電領域的分割之故，因而有無法 進行對於燈軸方向的調光的缺點問題。 對於此種問題，藉由在燈泡的外面的電極間的途中位 置設置外部電極來進行分割放電，惟在此種構成者，會發 生起動電壓的上昇或在發光管穿孔等的不方便。 一方面，由顧慮環境保護的觀點，作爲代替冷陰極螢 光燈的未含有水銀的新後照光用光源，例如，提案在玻璃 燈泡的外面配設帶狀的複數支電極，施加高頻的高電壓進 行點燈的外部電極型稀有氣體螢光燈（例如參照專利文獻 1)。 在此外部電極型稀有氣體螢光燈中，在玻璃燈泡端部 的內部塗佈導電性物質等，形成有補助燈的起動所用的易 起動部位。 又，作爲依此種外部電極型稀有氣體螢光燈的後照光 用燈單元，例如，提案兩端部所支撐的複數支（例如4支） 的燈在互相隔開排列的位置配設成平行地延伸的構成者 (例如參照專利文獻2)。 然而，在依此種稀有氣體螢光燈的後照光用燈單元， 也有無法進行對於燈軸方向的調光的缺點問題。 又’在具備如上述的易起動用導電物質的稀有氣體螢 光燈，爲了防止起動電壓上昇，在設有易起動用導電物質 的範圍，作爲未設有螢光體的構成之故，因而在易始動用 -6 - 201101367 導電物質的周邊，未發光的結果，容易發生亮度低的部 分，而在各個燈中，所定光輸出所得到的發光領域以外的 非發光領域變大。因此，構成後照光單元時，例如很難將 液晶等的顯示裝置以均勻的光穩定地進行照明的缺點問 題’又，爲了減少發光強度的不均勻，從燈必須增大由該 燈至光照射方向前方側的擴散板爲止的隔開距離，而有單 元全體成爲大型化的缺點問題。 〇 專利文獻1:日本特開平10-188910號公報 專利文獻2:日本特開2007-109492號公報 【發明內容】 如上所述地，在依冷陰極螢光燈或外部電極型稀有氣 體螢光燈無法進行對於燈軸方向的調光之故，因而例如分 割液晶畫面的上下方向而進行調光（LD控制）乃爲實情。 還有’在依外部電極型稀有氣體螢光燈的燈單元中， 〇 在各個燈’亮度低的部分發生在易起動用導電物質的周邊 部分’例如有很難將液晶等顯示裝置以均勻的光穩定地照 明的缺點問題。 本發明是依據如上述的情形而創作者，提供一種可減 小非發光領域的大小而在燈軸方向的大約全領域全面地得 到發光的外部電極型稀有氣體螢光燈作爲目的。 又’本發明的其他目的，是在於提供一種可進行燈軸 方向的調光，例如可將液晶等的顯示裝置均勻的光穩定地 照明’而可構成作爲小型者的後照光用稀有氣體螢光燈單 201101367 元。 本發明的一種外部電極型稀有氣體螢光燈，屬於具 備：螢光體塗佈於內面的直管狀玻璃燈泡，及在該玻璃燈 泡的外面互相相對所配設的一對外部電極，及配設於該玻 璃燈泡的內面的起動電極，而所定量的稀有氣體被封入於 玻璃燈泡的內部所成的外部電極型稀有氣體螢光燈，其特 徵爲： 上述起動電極是其至少一部分藉由上述螢光體所覆 蓋，而且隔著玻璃泡的管壁而與外部電極交叉的起動部位 被露出。 本發明的一種外部電極型稀有氣體螢光燈，屬於具 備：螢光體塗佈於內面的直管狀玻璃燈泡，及在該玻璃燈 泡的外面互相相對所配設的一對外部電極，而所定量的稀 有氣體被封入於玻璃燈泡的內部所成的外部電極型稀有氣 體螢光燈，其特徵爲： 上述一對外部電極的至少一方的外部電極藉由對於上 述玻璃燈泡的管軸方向被分割的複數分割電極群所構成， 而且在對應於玻璃燈泡的內面的各分割電極的位置配設有 起動電極， 上述起動電極之各個是其至少一部分藉由上述螢光體 所覆蓋，而且隔著玻璃泡的管壁而與外部電極交叉的起動 部位被露出。 本發明的一種後照光用稀有氣體螢光燈單元，其特徵 爲： -8 - 201101367 上述的外部電極型稀有氣體螢光燈的複數支爲二維地 並聯配置所成， 在玻璃燈泡的管軸方向互相地相同位置的複數支外部 電極型稀有氣體螢光燈與共通的驅動電路相連接。 本發明的一種後照光用稀有氣體螢光燈單元，其特徵 & · 爲 · 上述的外部電極型稀有氣體螢光燈的複數支爲二維地 0 並聯配置所成， 在各個外部電極型稀有氣體螢光燈的玻璃燈泡的管軸 方向互相地相同位置的分割電極與共通的驅動電路相連 接。 依照申請專利範圍第1項的外部電極型稀有氣體螢光 燈，除了起動電極的起動部位以外的部分藉由螢光體層所 覆蓋，藉此不會降低燈起動性，可儘量地減小非發光領域 的大小，因此在燈軸方向的大約全領域全面地可得到發 Ο 光。 依照申請專利範圍第2項的外部電極型稀有氣體螢光 燈，基本上，一對外部電極中的一方藉由分割電極群所構 成，藉此任意地設定燈軸方向的照度分布，而且除了起動 電極的起動部分藉由螢光體所覆蓋，藉此不會降低燈起動 性，可儘量地減小非發光領域的大小，因此，燈軸方向的 大約全領域全面地可得到發光。 依照申請專利範圍第3項的後照光用稀有氣體螢光燈 單元，在玻璃燈泡的管軸方向中將排列同一位置的複數支 -9 201101367 外部電極型稀有氣體螢光燈作爲一單元單位進行點燈控制 而可進行外部電極型稀有氣體螢光燈的燈軸方向的調光所 構成之故，因而可將液晶等的顯示裝置以均勻的光穩定地 進行照明，而且各個外部電極型稀有氣體螢光燈是可儘量 地減小非發光領域所構成者之故，因而可將位於該燈群的 光照射方向前方側的擴散板對於燈群近接地配置，因此， 可得到燈單元的小型化。 依照申請專利範圍第4項的後照光用稀有氣體螢光燈 單元，在複數支的外部電極型稀有氣體螢光燈的玻璃燈泡 的管軸方向中將排列同一位置的複數支外部電極型稀有氣 體螢光燈作爲一單元單位進行點燈控制而可進行外部電極 型稀有氣體螢光燈的燈軸方向的調光所構成之故，因而可 將液晶等的顯示裝置以均勻的光穩定地進行照明，而且各 個外部電極型稀有氣體螢光燈是可儘量地減小非發光領域 所構成者之故，因而可將位於該燈群的光照射方向前方側 的擴散板對於燈群近接地配置，因此，可得到燈單元的小 型化。 【實施方式】 以下，針對於本發明的實施形態加以詳細地說明。 [外部電極型稀有氣體螢光燈] 本發明的外部電極型稀有氣體螢光燈是具備螢光體塗 佈於內面的直管狀玻璃燈泡，及在該玻璃燈泡的外面互相 -10- 201101367 相對所配設的一對外部電極’及配設於該玻璃燈泡的內面 的起動電極，而所定量的稀有氣體被封入於玻璃燈泡的內 部所成者。 <第1實施形態〉 第1圖是表示本發明的外部電極型稀有氣體螢光燈的 一例子的構成的槪略的說明圖，第1 (a)圖是表示沿著燈中 心軸的斷面的斷面圖•第1(b)圖是第1(a)圖的A-A線的 端面圖，第1(c)圖是第1(a)圖的B-B線的端面圖。 此外部電極型稀有氣體螢光燈（以下，簡稱爲「稀有 氣體螢光燈」）1 〇，是具備：兩端部被密封的直管狀玻璃 燈泡1 1，及在此玻璃燈泡1 1的外面，以互相相對狀態， 沿著玻璃燈泡的管軸（燈中心軸）C延伸所形成的一對外部 電極15A，15B，及形成於玻璃燈泡11內的一方的端部領 域的起動電極1 8，稱有氣體被封入於玻璃燈泡1 1內所構 ❹成。 玻璃燈泡1 1是例如石英玻璃、鉛玻璃、鹼石英玻 璃、硼矽酸玻璃、鋁硼酸玻璃、鋇玻璃等所成，而其內面 的大約全領域全面地形成有螢光體層12。 螢光體層1 2是將發光可視光的螢光體塗佈於玻璃燈 泡11的內面，藉由經燒成所形成。 作爲螢光體的具體例，例如作爲紅色螢光體可例示 (Y，Gd)B03 : Eu或是Y2〇3 : Eu，作爲綠色螢光體可例示 LaP〇4 ： Ce ’ Tb作爲藍色螢光體可例示BaMgAl1()017 : -11 - 201101367[Technical Field] The present invention relates to an external electrode type rare gas fluorescent lamp and a rare gas fluorescent lamp unit for backlighting, which are used as a light source of a backlight device such as a liquid crystal display device. [Prior Art] For example, as a backlight source for a liquid crystal display panel, since a high luminance can be obtained and light is efficiently emitted, for example, a cold cathode fluorescent lamp (CCFL) is widely used. In some types of cold cathode fluorescent lamps, a straight tubular bulb having a fluorescent coating provided on the inner surface is formed, and a pair of electrodes are arranged to face each other and a small amount of mercury is sealed in the tube axial direction at both ends of the bulb. The configuration of the xenon-emitting phosphor by the ultraviolet rays generated by the mercury excited by the discharge, for example, the plurality of members are arranged in two dimensions in parallel so that the lamp center axes extend in parallel with each other to constitute the lamp unit for the rear illumination. In addition, the screen brightness of a liquid crystal display panel or the like is adjusted to an appropriate size in accordance with the brightness of the surroundings, the user's preference, image information, etc., but in recent years, the brightness of the screen is adjusted by backlighting. The dimming on the light source side is performed (L oca 1 D imming, hereinafter referred to as "LD"). When the screen brightness of the liquid crystal display panel or the like is performed by the LD, the backlight unit is required to be capable of dimming the lamp in the axial direction. -5- 201101367 However, for example, a lamp unit formed by a plurality of cold cathode fluorescent lamps arranged in parallel, the cold cathode fluorescent lamp must be discharged to the entire axial direction in the discharge space and cannot be divided in the discharge direction in the direction of the lamp axis. Therefore, there is a problem that the dimming of the direction of the lamp axis cannot be performed. In order to solve such a problem, the external discharge is provided at an intermediate position between the electrodes on the outer surface of the bulb to perform the split discharge. However, in such a configuration, an increase in the starting voltage or inconvenience in the perforation of the arc tube may occur. On the other hand, from the viewpoint of environmental protection, as a light source for a new backlight that does not contain mercury instead of a cold cathode fluorescent lamp, for example, it is proposed to arrange a plurality of strip-shaped electrodes on the outer surface of the glass bulb to apply high frequency. An external electrode type rare gas fluorescent lamp whose voltage is turned on (see, for example, Patent Document 1). In the external electrode type rare gas fluorescent lamp, a conductive material or the like is applied to the inside of the end portion of the glass bulb to form an easy-starting portion for starting the auxiliary lamp. Further, as a backlight unit for such an external electrode type rare gas fluorescent lamp, for example, a plurality of (for example, four) lamps supported at both end portions are arranged in parallel at positions spaced apart from each other. The constructor of the ground extension (for example, refer to Patent Document 2). However, in the backlight unit for a rare gas fluorescent lamp, there is a problem that the dimming in the direction of the lamp axis cannot be performed. In addition, in the rare gas fluorescent lamp having the conductive material for easy start as described above, in order to prevent the starting voltage from rising, a range in which the conductive material for easy start is provided is not provided with the phosphor, and thus Easy to start -6 - 201101367 The periphery of the conductive material, as a result of the non-lighting, is likely to cause a low-luminance portion, and in each of the lamps, the non-light-emitting field other than the light-emitting field obtained by the predetermined light output becomes large. Therefore, when the backlight unit is configured, for example, it is difficult to stably display a display device such as a liquid crystal with uniform light. Further, in order to reduce unevenness in luminous intensity, the lamp must be increased from the lamp to the light. The distance between the front and the side of the diffuser plate is large, and there is a problem that the entire unit is large. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei. No. 2007-109492. SUMMARY OF THE INVENTION As described above, a rare cathode fluorescent lamp or an external electrode type rare gas fluorescent lamp is used. Since dimming in the direction of the lamp axis cannot be performed, for example, it is a fact that dimming (LD control) is performed by dividing the vertical direction of the liquid crystal screen. Further, in the lamp unit of the external electrode type rare gas fluorescent lamp, the portion where the brightness of each lamp is low is generated in the peripheral portion of the conductive material for easy starting, for example, it is difficult to uniformly display the display device such as a liquid crystal. The shortcomings of light stable illumination. The present invention has been made in view of the circumstances as described above, and an object of the present invention is to provide an external electrode type rare gas fluorescent lamp which can reduce the size of the non-light-emitting area and which emits light in the entire direction of the lamp axis. In addition, another object of the present invention is to provide a dimmable light for backlighting, which can be used to illuminate the light in the direction of the lamp axis, for example, to uniformly illuminate the display device such as a liquid crystal. Light list 201101367 yuan. An external electrode type rare gas fluorescent lamp according to the present invention is a straight tubular glass bulb provided with a phosphor coated on an inner surface, and a pair of external electrodes disposed opposite to each other outside the glass bulb, and An external electrode type rare gas fluorescent lamp formed on the inner surface of the glass bulb and the rare gas is sealed in the interior of the glass bulb, wherein: the starting electrode is at least a part thereof The phosphor is covered by the phosphor, and the starting portion that intersects the external electrode via the tube wall of the glass bubble is exposed. An external electrode type rare gas fluorescent lamp according to the present invention is a straight tubular glass bulb provided with a phosphor coated on an inner surface, and a pair of external electrodes disposed opposite to each other outside the glass bulb. An external electrode type rare gas fluorescent lamp in which a predetermined amount of rare gas is enclosed in a glass bulb, wherein at least one external electrode of the pair of external electrodes is divided by a tube axis direction of the glass bulb The plurality of divided electrode groups are configured, and a starting electrode is disposed at a position corresponding to each of the divided electrodes on the inner surface of the glass bulb, and at least a part of the starting electrode is covered by the phosphor, and is interposed The starting portion of the wall of the glass bubble that intersects the external electrode is exposed. A rare gas fluorescent lamp unit for backlighting according to the present invention is characterized in that: -8 - 201101367 The plurality of external electrode type rare gas fluorescent lamps described above are formed by two-dimensional parallel arrangement, in the tube axis of the glass bulb A plurality of external electrode type rare gas fluorescent lamps having the same position in the same direction are connected to a common driving circuit. A rare gas fluorescent lamp unit for backlighting according to the present invention, characterized in that the plurality of external electrode type rare gas fluorescent lamps are arranged in parallel in two dimensions, and are rare in each external electrode type. The divided electrodes of the glass bulbs of the gas fluorescent lamp at the same position in the tube axis direction are connected to the common driving circuit. According to the external electrode type rare gas fluorescent lamp of the first aspect of the patent application, the portion other than the starting portion of the starting electrode is covered by the phosphor layer, whereby the lamp startability is not lowered, and the non-lighting can be minimized. The size of the field, so that the entire range of the direction of the lamp axis is fully available. According to the external electrode type rare gas fluorescent lamp of the second aspect of the patent application, basically, one of the pair of external electrodes is constituted by the divided electrode group, thereby arbitrarily setting the illuminance distribution in the lamp axis direction, and in addition to starting The starting portion of the electrode is covered by the phosphor, whereby the lamp startability is not lowered, and the size of the non-light-emitting region can be reduced as much as possible. Therefore, the entire range of the lamp axis direction can be fully illuminated. According to the rare gas fluorescent lamp unit for backlighting according to the third paragraph of the patent application, a plurality of illuminating illuminating lamps of the same position in the direction of the tube axis of the glass bulb -9 201101367 external electrode type rare gas fluorescent lamp are used as a unit unit. Since the lamp control can be performed by dimming the lamp axis direction of the external electrode type rare gas fluorescent lamp, the display device such as liquid crystal can be stably illuminated with uniform light, and each external electrode type rare gas firefly can be used. Since the light lamp can reduce the number of non-light-emitting areas as much as possible, the diffuser plate located on the front side in the light irradiation direction of the lamp group can be disposed close to the ground of the lamp group, and thus the lamp unit can be downsized. According to the rare gas fluorescent lamp unit for backlighting according to the fourth aspect of the patent application, a plurality of external electrode type rare gases at the same position are arranged in the tube axis direction of the glass bulb of the plurality of external electrode type rare gas fluorescent lamps. Since the fluorescent lamp is controlled as a unit cell and can be dimmed in the direction of the lamp axis of the external electrode type rare gas fluorescent lamp, the display device such as liquid crystal can be stably illuminated with uniform light. Further, each of the external electrode type rare gas fluorescent lamps can reduce the number of non-light-emitting regions as much as possible, so that the diffusing plate located on the front side of the light irradiation direction of the lamp group can be disposed close to the ground of the lamp group, The miniaturization of the lamp unit is obtained. [Embodiment] Hereinafter, embodiments of the present invention will be described in detail. [External Electrode Type Rare Gas Fluorescent Lamp] The external electrode type rare gas fluorescent lamp of the present invention is a straight tubular glass bulb provided with a phosphor coated on the inner surface, and is external to the glass bulb to each other -10- 201101367 A pair of external electrodes ' disposed and a starting electrode disposed on the inner surface of the glass bulb, and a predetermined amount of rare gas is enclosed in the interior of the glass bulb. <First Embodiment> Fig. 1 is a schematic explanatory view showing a configuration of an example of an external electrode type rare gas fluorescent lamp of the present invention, and Fig. 1(a) is a view showing a broken line along the center axis of the lamp Sectional view of the surface: Fig. 1(b) is an end view of the line AA of Fig. 1(a), and Fig. 1(c) is an end view of line BB of Fig. 1(a). In addition, the electrode-type rare gas fluorescent lamp (hereinafter, simply referred to as "rare gas fluorescent lamp") has a straight tubular glass bulb 1 1 sealed at both ends, and outside the glass bulb 1 1 a pair of external electrodes 15A, 15B formed along the tube axis (light center axis) C of the glass bulb in mutually opposing state, and a starting electrode 18 formed in one end region of the glass bulb 11 It is said that a gas is enclosed in the glass bulb 11 and constructed. The glass bulb 11 is made of, for example, quartz glass, lead glass, alkali quartz glass, borosilicate glass, aluminoborosilicate glass, bismuth glass, or the like, and a phosphor layer 12 is formed entirely on the inner surface of the entire surface. The phosphor layer 12 is formed by applying a phosphor that emits visible light to the inner surface of the glass bulb 11 by firing. Specific examples of the phosphor include, for example, a red phosphor (Y, Gd) B03 : Eu or Y 2 〇 3 : Eu, and as a green phosphor, LaP 〇 4 : Ce ' Tb can be exemplified as blue fluorescing. The light body can be exemplified by BaMgAl1() 017 : -11 - 201101367
Eu，惟螢光體是並不被限定者。 外部電極1 5 A, 1 5 B是將如銀糊的導電性糊，隔著玻璃 燈泡1 1外面的燈中心軸C經絲網印刷曬印在互相相對的 位置所構成，一方的外部電極15A作爲高壓側電極，而 另一方的外部電極1 5 B作爲低壓側電極。又，外部電極 1 5 A，1 5 B是將如切斷鋁帶的帶狀者黏貼於玻璃燈泡1 1的 外面所構成也可以。 雖未予圖示，外部電極15A，15B是其一端部經由引出 線電性地被連接於導電性優異的金屬所成的饋電端子， 又，饋電部以外的部分是例如藉由玻璃糊所成的保護膜所 覆蓋。 作爲封入於玻璃燈泡Π內的稀有氣體，例如可例示 氙氣體或氙與其他稀有氣體的混合氣體，惟其封入量是例 如 13kPa(100Torr) ° 如上述地，在玻璃燈泡11的內面的一方端部領域， 具體而言，例如，在燈點燈中的光取出效率之關係中在影 響最少的部位的一部位，例如設有碳糊等的導電性物質所 成的圓弧狀或環狀起動電極18，而被容量耦合於一對外 部電極1 5 A , 1 5 B。 起動電極1 8是例如在玻璃燈泡1 1的內面塗佈糊狀的 導電性物質，經燒成所形成者，而在此實施例中，在垂直 於燈中心軸C的斷面（參照第1(b)圖），位於一對外部電極 1 5 A, 1 5B間的一方的燈泡內面領域的全領域全面地朝周方 向延伸，而兩端部與一對外部電極1 5 A , 1 5 B的各個交叉的 -12- 201101367 方式設置成超越對應於外部電極所配設的燈泡外面領域的 燈泡內面領域的端緣朝周方向延伸。 又，上述稀有氣體螢光燈1〇的起動電極18是其至少 一部分藉由螢光體層1 2所覆蓋’而且隔著玻璃燈泡1 1的 管壁有外部電極15A，15B交叉的起動部位18A被露出。 因此，藉由高頻電壓被施加於一對外部電極 1 5 A，1 5 B，在設有玻璃燈泡1 1的內部空間的起動電極1 8 0 的部位發生所謂預備放電之後，連鎖性地擴展至稀有氣體 螢光燈1 0的軸方向的全領域，藉由經此所發生的放電被 放射的紫外線使得螢光體被激勵而可視光被放射至玻璃燈 泡1 1的外部，惟除了起動電極1 8的起動部位1 8 A以外 的部分，藉由螢光體層1 2所覆蓋的狀態，而螢光體層12 設置至直到該起動電極1 8所位置的端部領域爲止，藉 此，依照上述構成的稀有氣體螢光燈10，若爲習知的稀 有氣體螢光燈，即使在配設有作爲非發光領域的起動電極 〇 18的端部領域中，也可得到充分的發光之故，因而不會 降低燈起動性，可儘量地減小非發光領域的大小而軸方向 的大約全領域全面地可得到發光。 以下，針對於爲了確認本發明的效果所進行的實施例 加以說明。 依據表示於第1圖的構成，來製作本發明的稀有氣體 螢光燈。該稀有氣體螢光燈的具體性構成是如下所述。 [稀有氣體螢光燈（10)的構成] -13- 201101367 玻璃燈泡（1 1):材質；硼矽酸玻璃，外徑1 0mm，全 長 1 9 0 m m。 外部電極（15A,15B):材質；銀糊，全長：190mm， 寬度：0.5 mm。 起動電極（1 8) •形成位置；從玻璃燈泡的端壁位於軸 方向內方側 5mm位置，寬度；約 1mm ，長度（周方 向）20mm，露出部分的長度（起動部位）；約5mm。 螢光體層（12):厚度；15μπι。 發光用氣體：氙氣體，封入量；13kP a 又，製作除了作成露出起動電極全體的構成以外是具 有與上述者同一構成的比較用稀有氣體螢光燈。 藉由將頻率50kHz，峰値電壓1 700V的高頻電壓施加 外部電極間來點亮上述本發明的稀有氣體螢光燈及比較用 的稀有氣體螢光燈的各個燈。進行測定有起動電極的一側 的端部領域的亮度。將結果表示於第2圖。在第2圖中， 縱軸是將燈軸方向的中央部的亮度作爲1 0 0 %時的相對亮 度，橫軸是來自配設有起動電極的一側的端壁的燈軸方向 的隔開距離，（a)爲表示本發明的稀有氣體螢光燈的結 果，（b)爲表示比較用的稀有氣體螢光燈的結果。 由此結果可明白，依照本發明的稀有氣體螢光燈，確 認了燈軸方向的端部領域的亮度是可得到比中央部還要 低，惟與比較用的稀有氣體螢光燈相比較可得到高亮度。 因此，例如構成後照光單元時，可減低發生燈軸方向的亮 度不均勻者。 -14- 201101367 <第2實施形態> 第3圖是表示本發明的外部電極型稀有氣體螢光燈的 其他例子的構成的槪略的說明圖，第3(a)圖是表示沿著燈 的中心軸的斷面的斷面圖，第3(b)是第3(a)圖的D-D線 的端面圖，第3(c)圖是第3(a)圖的E-E線的端面圖。 此稀有氣體螢光燈20是在上述第1實施形態的稀有 0 氣體螢光燈（第1圖）中，除了藉由一對外部電極15A，15B 中的至少一方對於稀有氣體螢光燈20的軸方向被分割電 極群所構成，而且起動電極1 8配設在對應於玻璃燈泡1 1 的內面的各個分割電極的位置所構成以外，是具有與上述 第1實施形態的稀有氣體螢光燈1 〇同一構成。在第3圖 中，在與表示於第1圖的稀有氣體螢光燈同一構成構件， 方便上給予同一的符號。 在此稀有氣體螢光燈2 0中，例如作爲低壓側電極的 ❹ 另一方的外部電極15B，藉由例如4個分割電極16A〜 1 6 D形成於朝燈軸方向等間隔別地隔開的位置的分割電極 群所構成。 互相地鄰接的分割電極的隔開距離L，是一面防止發 生分割電極間的沿面放電，一面爲了抑制減小非發光領域 的大小，例如作成5〜1 5 m m較佳。 又，分割電極數並不限定於4個者，視目的可適當地 設定，惟安裝上的配線是儘可能較少的理由，4至1 2個 左右較佳。 -15- 201101367 構成一方的外部電極15A’及另一方的外部電極15B 的各個分割電極1 6 A〜1 6 D是未予以圖示’惟其一端部經 由引出線電性地連接於導電性優異的金屬所成的饋電端 子，因此，藉由適當地調整被施加於一方的外部電極1 5 A 與各個分割電極1 6 A〜1 6 D之間的電壓，構成可任意地設 定燈軸方向的照度分布。 又，饋電部以外的部分是例如藉由燒成玻璃漿所成的 保護所覆蓋。 各個起動電極1 8是例如形成於對應在各個分割電極 1 6A〜1 6D所配設的燈泡外面領域的燈泡內面領域的—端 側的位置，具體而言’例如形成於從各個分割電極1 6 A〜 1 6D的一端緣位置位於燈軸方向內方側5至1 0mm的範圍 內的位置較佳。 各個起動電極1 8是例如在垂直於燈中心軸C的斷面 (參照第3(b)圖），位於一對外部電極1 5 A，1 5B間的一方的 燈泡內面領域的全領域全面地朝周方向延伸’而兩端部與 一對外部電極15A,15B的各個交叉的方式設置成超越對應 於外部電極所配設的燈泡外面領域的燈泡內面領域的端緣 朝周方向延伸，其至少一部分藉由螢光體層12所覆蓋’ 而且隔著玻璃燈泡1 1的管壁與構成一方的外部電極1 5 A 及另一方的外部電極的各分割電極16A〜16D的起動 部位1 8 A被露出。 而且，依照上述構成的稀有氣體螢光燈20 ’基本 上，—對外部電極15A,]5B中的一·方藉由分割電極16A〜 -16 - 201101367 1 6D群所構成，藉由可任意地設定燈軸方向的照度分布’ 且而除了起動電極18的起動部位18A以外的部分藉由登 光體層1 2所覆蓋的狀態，藉此若爲習知的稀有氣體螢光 燈，即使在配設有非發光領域的起動電極18的領域中’ 也可得到充分的發光之故’因而不會降低燈起動性’可儘 量地減小非發光領域的大小，因此軸方向的大約全領域全 面地可得到發光。 D 如上述的外部電極型稀有氣體螢光燈是如上述地’例 如作爲液晶顯示裝置等的後照光裝置的光源成爲有用者。 以下，針對於本發明的後照光用稀有氣體螢光燈單元 加以說明。 [後照光用稀有氣體螢光燈單元] <第1實施形態> 第4圖是表示使用圖示於第1圖的外部電極型稀有氣 〇 體螢光燈的本發明的後照光用稀有氣體螢光燈單元的一例 子的構成的槪略說明圖，第5圖是槪略地表示圖示於第4 圖的稀有氣體螢光燈單元的燈點燈裝置的一構成例的一部 分的方塊圖。 該後照光用稀有氣體螢光燈單元（以下簡稱爲「燈單 元」），是上述第1實施形態的外部電極型稀有氣體螢光 燈1 0的複數支，對於燈中心軸方向（在第4圖爲左右方 向）’例如4支燈中心軸互相地位置一致的狀態下排列， 對於垂直於燈中心軸的方向（在第4圖爲上下方向）有9支 -17- 201101367 以互相平行地延伸燈中心軸的狀態排列地方式，二維地μ 聯配置（並設）所成，將藉由依L D的調光所得到光量的均 勻化的光照射領域LA，例如對於燈中心軸方向分割成4 個，而對於垂直於燈中心軸的方向分割成3個的合計12 個領域（以下，稱爲「LD控制單位領域」。）Z1〜Z12 時，對於一 LD控制單位領域，作成從燈中心軸方向互相 地配置於相同位置的（排列配置在垂直於燈中心軸的方向 的）互相地鄰接的複數支例如3支稀有氣體螢光燈1 〇放射 光的構成。 點亮各個稀有氣體螢光燈1 〇的燈點燈裝置，是針對 於複數LD控制單位領域Z1〜Z12的各個領域，具備將 對於一 LD控制單位領域進行光照射的3支稀有氣體螢光 燈1 0作爲一單元單位而點燈控制所用的共通驅動電路（LD 控制電路）3 〇，各個驅動電路3 0是藉由在各個稀有氣體螢 光燈1 〇的外部電極1 5 A，1 5 B間施加高頻電壓（矩形波電壓） 進行點亮稀有氣體螢光燈1 〇者。 各個驅動電路3 0是具備輸出側分別並聯地連接於對 於一 LD控制單位領域進行光照射的例如3支稀有氣體螢 光燈1 0的另一方的外部電極1 5 B，而且輸入側被連接於 反相器電路3 2的變壓器3 1，作成將從直流電源（未予圖 示）所供應的數十V至數百V的直流電壓藉由反相器電路 3 2變換成交流電壓，例如藉由開關控制F E T等的開關元 件，俾將高頻電壓（例如矩形波）輸入至變壓器而藉由變壓 器31進行昇壓並施加於各個稀有氣體螢光燈10的構成。 -18- 201101367 (在此，各個稀有氣體螢光燈10的—方的外部電極15八是 被連接於GND。 又，燈點燈裝置是具有控制電路3 5，而該控制電路 備有：取得畫面亮度的畫像資訊S的畫像資訊取得部 3 6，及對於所取得的畫像資訊S而進行適當的訊號處理並 輸出畫像訊號的畫像訊號處理部3 7，及依據該畫像訊 號，來決定針對於各個LD控制領域Z1〜Z12的亮度而輸 Q 出對於反相器電路32的調光控制訊號的控制訊號發生部 38 > 在該燈單元中，依燈中心軸方向的同一位置的3支稀 有氣體螢光燈10的各個LD控制領域Z1〜Z12的調光， 具體而言，藉由控制電路35，例如因應於與各個LD控制 領域Z 1〜Z 1 2對應的畫面領域的亮度所輸出的調光控制 訊號被輸出至反相器電路3 2而在動態範圍的調光或是點 亮熄滅（功能調光），爲各個LD控制單位領域Z 1〜Z 1 2別 〇 地進行，藉此，LD被實行。 表示上述燈單元的具體性構成例，例如畫面尺寸爲相 當32型的LCD顯示裝置的後照光用者時，則各個稀有 氣體螢光燈10的全長是如190mm，稀有氣體螢光燈1〇 的燈中心軸方向的配設間距是如1 0 m m，而垂直於燈中心 軸的方向的配設間距是如45mm。 在上述燈單元中，從各個稀有氣體螢光燈i 〇所放射 的光’是例如經由擴散板，指向性控制片及擴散片等，例 如照射在顯示裝置等，惟各個稀有氣體螢光燈1 〇的燈中 -19- 201101367 心軸所位置的平面與擴散板的隔開距離，是例如作成2 0 〜3 Omm。 又，依照上述構成的燈單元，將排列在垂直於稀有氣 體螢光燈10的燈中心軸的方向互相鄰接的三支稀有氣體 螢光燈1 0作爲一單元單位進行點燈控制而構成可進行燈 軸方向的調光之故，因而例如可將液晶等的顯示裝置以均 勻的光穩定地照明，而且各個稀有氣體螢光燈10是儘量 地減小非發光領域的方式所構成者之故，因而若爲依習知 ^ | ! 的外部電極型稀有氣體螢光燈的燈單元，例如，將需要 3 5mm左右大小的各個稀有氣體螢光燈1 〇的燈中心軸的 位置的平面與擴散板之隔開距離減小至例如25mm，亦 即，可將擴散板對於燈群近接地配置，因此可得到燈單元 的小型化。 <第2實施形態> 第6圖是表示使用圖示於第3圖的外部電極型稀有氣 U 體螢光燈的本發明的後照光用稀有氣體螢光燈單元的其他 例子的構成的槪略說明圖’第7圖是槪略地表示圖示於第 6圖的稀有氣體螢光燈單元的燈點燈裝置的一構成例的一 部分的方塊圖。 該後照光用稀有氣體營光燈單元（燈單元），是上述第 2實施形態的外部電極型稀有氣體螢光燈2 0的複數支， 例如有9支以互相地平行延伸燈中心軸的狀態排列的方 式，二維地並聯配置（並設）所成，將藉由依L D的調光所 -20- 201101367 得到光量的均勻化的光照射領域LA，例如對於燈中心軸 方向分割成4個，而對於垂直於燈中心軸的方向分割成3 個的合計1 2個LD控制單位領域Z 1〜Z 1 2時，對於一 LD 控制單位領域，來自互相地鄰接的複數支例如3支的稀有 氣體螢光燈2 0的燈中心軸方向互相地配置於相同位置的 分割電極的發光領域的光被放射的構成。 點亮各個稀有氣體螢光燈20的燈點燈裝置，是與表 0 示於第5圖者基本上爲相同，針對於複數LD控制單位領 域Z 1〜Z 1 2的各個領域，具備將對於一 LD控制單位領域 進行光照射的3支稀有氣體螢光燈1 0的各該分割電極的 發光領域作爲一單元單位而點燈控制，所用的共通驅動電 路（LD控制電路）30，及具有畫像資訊取得部36，畫像訊 號處理部3 7及控制訊號發生部3 8的控制電路3 5。 各個驅動電路30是藉由在構成各個稀有氣體螢光燈 20的一方的外部電極15A與另一方的外部電極15B的分 〇 割電極間施加高頻電壓（矩形波電壓）進行點亮稀有氣體螢 光燈1 0者，具備輸出側分別並聯地連接於對於一LD控 制單位領域進行光照射的例如3支稀有氣體螢光燈2 0的 分割電極16A(16B〜16D)，而且輸入側被連接於反相器電 路32的變壓器3 1，作成將從直流電源（未予圖示）所供應 的數十V至數百V的直流電壓藉由反相器電路32變換成 交流電壓，例如藉由開關控制FET等的開關元件，俾將 高頻電壓（例如矩形波）輸入至變壓器31而藉由變壓器31 進行昇壓並施加於各個稀有氣體螢光燈20的構成。在 -21 - 201101367 此，各個稀有氣體螢光燈20的一方的外部電極15A是被 連接於GND。 在該燈單元中，也依互相地鄰接的3支稀有氣體螢光 燈 20的各個的燈中心軸方向的同一位置的分割電極 16A(16B〜16D)的各個 LD控制單位領域 Z1〜Z12的調 光，具體而言，藉由控制電路35，例如因應於與各個LD 控制領域Z 1〜Z 1 2對應的畫面領域的亮度所輸出的調光 控制訊號被輸出至反相器電路32，而在動態範圍的調光 或是點亮熄滅（功能調光），爲各個LD控制單位領域Z 1〜 Z 1 2別地進行，藉此，LD被實行。 表示上述燈單元的具體性構成例，例如畫面尺寸爲相 當32型的LCD顯示裝置的後照光用者時，則各個稀有氣 體螢光燈20的全長是如780mm，外徑爲如10mm，各個 分割電極〗6A〜16D的全長爲如180mm，鄰接的分割電極 間的隔間距離爲1 〇mm，而稀有氣體螢光燈2 0的配設間 距爲如45mm。 上述燈單元的各個稀有氣體螢光燈2〇的燈中心軸所 位置的平面與擴散板之隔間距離是如20〜30mm。 又，依照上述構成的燈單元，將互相地鄰接的3支稀 有氣體螢光燈1 0的各個的燈中心軸方向互相相同位置的 分割電極作爲一單元單位進行點燈控制而構成可進行燈軸 方向的調光之故，因而例如可將液晶等的顯示裝置以均勻 的光穩定地照明，而且各個稀有氣體螢光燈20是儘量地 減小非發光領域的方式所構成者之故，因而若爲依習知的 -22- 201101367 外部電極型稀有氣體螢光燈的燈單元，例如將需要3 5 mm 左右大小的各個稀有氣體螢光燈1 0的燈中心軸所位置的 平面與擴散板之隔開距離減小至例如25mm，亦即，可將 擴散板對於燈群近接地配置，因此可得到燈單元的小型 化。 以上，針對於本發明的實施形態加以說明，惟本發明 是並不被限定於上述的實施形態者，可加以各種變更。 0 例如，本發明的第1實施形態的外部電極型稀有氣體 螢光燈，是並不被限定於起動電極設於端部領域的一部位 的構成者。 構成本發明的稀有氣體螢光燈單元的稀有氣體螢光燈 數及配設圖案是並不被限定於上述構成者’又，針對於所 設定的LD控制單位領域數，及燈點燈裝置的構成也並未 特別地加以限定者。 〇 【圖式簡單說明】 第1圖是表示本發明的外部電極型稀有氣體螢光燈的 一例子的構成的槪略的說明圖’第1 (a)圖是表示沿著燈中 心軸的斷面的斷面圖，第1(b)圖是第1(a)圖的A-A線的 端面圖，第1(c)圖是第1(a)圖的B-B線的端面圖。 第2圖是表示在實驗例所製作的外部電極型稀有氣體 螢光燈的起動電極所配設的一側的端領域的高度分布的測 定結果的圖表。 第3圖是表示本發明的外部電極型稀有氣體螢光燈的 -23- 201101367 其他例子的構成的槪略的說明圖，第3 (a)圖是表示沿著燈 的中心軸的斷面的斷面圖，第（b)是第3(a)圖的D-D線的 端面圖，第3(c)圖是第3(a)圖的E-E線的端面圖。 第4圖是表示使用圖示於第1圖的外部電極型稀有氣 體螢光燈的本發明的後照光用稀有氣體螢光燈單元的一例 子的構成的槪略說明圖。 第5圖是槪略地表示圖示於第4圖的稀有氣體螢光燈 單元的燈點燈裝置的一構成例的一部分的方塊圖。 第6圖是表示使用圖示於第3圖的外部電極型稀有氣 體螢光燈的本發明的後照光用稀有氣體螢光燈單元的其他 例子的構成的槪略說明圖。 第7圖是槪略地表示圖示於第6圖的稀有氣體螢光燈 單元的燈點燈裝置的一構成例的一部分的方塊圖。 【主要元件符號說明】 10:外部電極型稀有氣體螢光燈 1 1 :玻璃燈泡 1 2 :螢光體層 1 5 A : —方的外部電極 15B:另一方的外部電極 16A〜16D:分割電極 1 8 :起動電極 1 8 A :起動部位 20 :稀有氣體螢光燈 -24- 201101367 3 0 :驅動電路（LD控制電路） 3 1 :變壓器 3 2 :反相器電路 3 5 :控制電路 3 6 :畫像資訊取得部 3 7 :畫像訊號處理部 3 8 :控制訊號發生部 C :玻璃燈泡的管軸（燈中心軸） LA :光照射領域 Z1〜Z12 : LD控制單位領域 S :畫像資訊Eu, but the phosphor is not limited. The external electrodes 1 5 A, 1 5 B are formed by printing a conductive paste such as a silver paste on a lamp center axis C outside the glass bulb 1 1 at a position opposite to each other by screen printing, and one external electrode 15A As the high voltage side electrode, the other external electrode 15 5 B is used as the low voltage side electrode. Further, the external electrodes 1 5 A, 1 5 B may be formed by adhering a strip-shaped person such as a cut aluminum tape to the outside of the glass bulb 1 1 . Although not shown, the external electrodes 15A and 15B are feed terminals in which one end portion is electrically connected to a metal having excellent conductivity via a lead wire, and a portion other than the power feeding portion is, for example, a glass paste. Covered by a protective film. The rare gas enclosed in the glass bulb is, for example, a helium gas or a mixed gas of helium and other rare gases, but the sealing amount is, for example, 13 kPa (100 Torr). As described above, at one end of the inner surface of the glass bulb 11 Specifically, for example, in a portion where the light extraction efficiency in the lamp lighting is the least affected portion, for example, an arc-shaped or ring-shaped starter made of a conductive material such as carbon paste is provided. The electrode 18 is capacitively coupled to a pair of external electrodes 1 5 A , 1 5 B. The starter electrode 18 is, for example, a paste-like conductive material applied to the inner surface of the glass bulb 1 1 and formed by firing, and in this embodiment, a cross section perpendicular to the lamp center axis C (refer to 1(b))), the entire area of the inner surface of one of the bulbs between the pair of external electrodes 1 5 A, 1 5B extends in the circumferential direction, and both ends and a pair of external electrodes 1 5 A , 1 The -12-201101367 mode of each of the intersections of 5 B is set to extend in the circumferential direction beyond the end edge of the bulb inner surface area corresponding to the outer region of the bulb to which the external electrodes are disposed. Further, the starting electrode 18 of the rare gas fluorescent lamp 1 is at least partially covered by the phosphor layer 12, and the starting portion 18A where the external electrodes 15A and 15B intersect each other across the wall of the glass bulb 11 is Exposed. Therefore, the high-frequency voltage is applied to the pair of external electrodes 1 5 A, 1 5 B, and after the so-called preliminary discharge occurs at the portion of the start electrode 1 80 where the internal space of the glass bulb 11 is provided, the chain is expanded. Up to the entire area of the axial direction of the rare gas fluorescent lamp 10, the ultraviolet light emitted by the discharge generated thereby causes the phosphor to be excited and the visible light is radiated to the outside of the glass bulb 11, except for the starting electrode The portion other than the starting portion 1 8 A of 1 8 is covered by the phosphor layer 12, and the phosphor layer 12 is set to the end region up to the position of the starting electrode 18, thereby The rare gas fluorescent lamp 10 is a conventional rare gas fluorescent lamp, and even in the field of the end portion where the starting electrode 〇18 is provided as a non-light-emitting region, sufficient light can be obtained. The lamp startability is not lowered, and the size of the non-light-emitting area can be reduced as much as possible, and the entire area of the axial direction can be fully illuminated. Hereinafter, an embodiment performed to confirm the effects of the present invention will be described. The rare gas fluorescent lamp of the present invention was produced in accordance with the configuration shown in Fig. 1. The specific configuration of the rare gas fluorescent lamp is as follows. [Composition of rare gas fluorescent lamp (10)] -13- 201101367 Glass bulb (1 1): material; borosilicate glass, outer diameter 10 mm, full length 1 9 0 m m. External electrode (15A, 15B): material; silver paste, full length: 190mm, width: 0.5 mm. Starting electrode (1 8) • Positioning position; 5 mm from the end wall of the glass bulb in the axial direction, width; about 1 mm, length (circumferential direction) 20 mm, length of exposed part (starting part); about 5 mm. Phosphor layer (12): thickness; 15 μm. Gas for luminescence: krypton gas, encapsulation amount; 13 kP a. A comparative rare gas fluorescent lamp having the same configuration as that described above except for the configuration in which the entire starting electrode is exposed. Each of the rare gas fluorescent lamp of the present invention and the rare gas fluorescent lamp for comparison is lit by applying a high frequency voltage having a frequency of 50 kHz and a peak voltage of 1 700 V between the external electrodes. The brightness of the end region of the side having the starting electrode was measured. The results are shown in Figure 2. In Fig. 2, the vertical axis is the relative luminance when the luminance in the central portion of the lamp axis direction is 100%, and the horizontal axis is the separation from the lamp axis direction of the end wall on the side where the starting electrode is disposed. The distance (a) is a result of the rare gas fluorescent lamp of the present invention, and (b) is a result of the rare gas fluorescent lamp for comparison. From this result, it is understood that the rare gas fluorescent lamp according to the present invention confirms that the brightness of the end portion in the direction of the lamp axis is lower than that of the central portion, but is comparable to the rare gas fluorescent lamp for comparison. Get high brightness. Therefore, for example, when the backlight unit is formed, it is possible to reduce unevenness in luminance in the direction of the lamp axis. -14-201101367 <Second Embodiment> Fig. 3 is a schematic explanatory view showing a configuration of another example of the external electrode type rare gas fluorescent lamp of the present invention, and Fig. 3(a) is a view along A cross-sectional view of a cross section of a central axis of the lamp, a third (b) is an end view of the DD line of the third (a) figure, and a third (c) is an end view of the EE line of the third (a) figure. . The rare gas fluorescent lamp 20 is in the rare 0 gas fluorescent lamp (Fig. 1) of the first embodiment, except that at least one of the pair of external electrodes 15A and 15B is used for the rare gas fluorescent lamp 20. The axial direction is constituted by the divided electrode group, and the starter electrode 18 is disposed at a position corresponding to each of the divided electrodes of the inner surface of the glass bulb 1 1 , and has the rare gas fluorescent lamp of the first embodiment. 1 〇 the same composition. In Fig. 3, the same components as those of the rare gas fluorescent lamp shown in Fig. 1 are given the same reference numerals. In the rare gas fluorescent lamp 20, for example, the other external electrode 15B as the low-voltage side electrode is formed by, for example, four divided electrodes 16A to 16D, which are equally spaced apart in the direction of the lamp axis. The position of the divided electrode group is formed. The distance L between the mutually adjacent divided electrodes is such that the creeping discharge between the divided electrodes is prevented, and in order to suppress the reduction in the size of the non-light-emitting region, for example, it is preferably 5 to 15 m. Further, the number of divided electrodes is not limited to four, and may be appropriately set depending on the purpose, but the wiring to be mounted is as small as possible, and about 4 to 12 are preferable. -15- 201101367 Each of the divided electrodes 1 6 A to 1 6 D constituting one external electrode 15A' and the other external electrode 15B is not shown. However, the one end portion is electrically connected to the conductive portion through the lead wire. Since the feeding terminal formed by the metal is appropriately adjusted by the voltage applied between the one external electrode 15 A and each of the divided electrodes 1 6 A to 1 6 D, the lamp axis direction can be arbitrarily set. Illumination distribution. Further, the portion other than the power feeding portion is covered by, for example, a protective layer formed by firing a glass paste. Each of the starter electrodes 18 is formed, for example, at a position on the end side of the bulb inner surface area corresponding to the outer surface of the bulb disposed in each of the divided electrodes 16A to 16D, and is specifically formed, for example, from each of the divided electrodes 1 It is preferable that the position of one end edge of 6 A to 1 6D is in the range of 5 to 10 mm on the inner side in the direction of the lamp axis. Each of the starter electrodes 18 is, for example, a cross section perpendicular to the center axis C of the lamp (see FIG. 3(b)), and is located in the entire field of the inner surface of one of the pair of external electrodes 1 5 A, 1 5B. The ground portion extends in the circumferential direction, and the end portions and the pair of external electrodes 15A, 15B intersect each other so as to extend beyond the end edge of the bulb inner surface region corresponding to the outer bulb region of the external electrode. At least a portion of the divided electrodes 16A to 16D of the glass bulb 11 are separated from each other by the phosphor layer 12 and the starting portions of the divided electrodes 16A to 16D constituting one of the external electrodes 15 A and the other external electrodes are 1 8 A. Being exposed. Further, the rare gas fluorescent lamp 20' having the above configuration is basically constituted by one of the pair of external electrodes 15A, 5B by the divided electrodes 16A to -16 - 201101367 1 6D group, by arbitrarily The illuminance distribution in the direction of the lamp axis is set, and the portion other than the starting portion 18A of the starting electrode 18 is covered by the light-receiving layer 12, whereby the conventional rare gas fluorescent lamp is provided even if it is disposed. In the field of the non-light-emitting field of the starting electrode 18, 'sufficient illumination can also be obtained', so that the lamp startability is not reduced, the size of the non-illuminating field can be reduced as much as possible, so that the axial direction is comprehensively applicable to the entire field. Get radiant. D The above-described external electrode type rare gas fluorescent lamp is useful as a light source of a backlight device such as a liquid crystal display device as described above. Hereinafter, the rare gas fluorescent lamp unit for backlighting of the present invention will be described. [Rare gas fluorescent lamp unit for backlighting] <First embodiment> Fig. 4 is a view showing the rare light for backlighting of the present invention using the external electrode type rare gas sputum fluorescent lamp shown in Fig. 1 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 5 is a block diagram schematically showing a part of a configuration example of a lamp lighting device of the rare gas fluorescent lamp unit shown in FIG. Figure. The rare-light fluorescent lamp unit (hereinafter simply referred to as "light unit") is a plurality of external electrode type rare gas fluorescent lamps 10 of the first embodiment, and is in the direction of the center axis of the lamp (in the fourth The figure is the left-right direction. 'For example, the four central axes of the lamps are aligned with each other. For the direction perpendicular to the central axis of the lamp (up and down in Fig. 4), there are 9 -17-201101367 extending in parallel with each other. The state in which the state of the center axis of the lamp is arranged is two-dimensionally arranged in parallel, and the light is irradiated to the field LA by the light amount obtained by the dimming of the LD, for example, the direction of the center axis of the lamp is divided into 4 For a total of 12 fields (hereinafter referred to as "LD control unit area") which are divided into three in the direction perpendicular to the center axis of the lamp, when Z1 to Z12 are used, for the LD control unit area, the center axis of the lamp is created. A plurality of mutually adjacent, for example, three rare gas fluorescent lamps 1 arranged in the same position (arranged in a direction perpendicular to the central axis of the lamp) are radiated. The lamp lighting device that illuminates each of the rare gas fluorescent lamps 1 针对 is for each field of the LD control unit area Z1 to Z12, and has three rare gas fluorescent lamps that illuminate an LD control unit area. 10 as a unit unit and a common driving circuit (LD control circuit) 3 for lighting control, each driving circuit 30 is an external electrode 1 5 A, 1 5 B by each rare gas fluorescent lamp 1 〇 A high-frequency voltage (rectangular wave voltage) is applied between them to illuminate the rare gas fluorescent lamp. Each of the drive circuits 30 is provided with an external electrode 15B that is connected in parallel to, for example, three rare gas fluorescent lamps 10 that emit light to one LD control unit area, and that is connected to the input side. The transformer 31 of the inverter circuit 3 2 is configured to convert a DC voltage of several tens of volts to several hundreds of volts supplied from a DC power source (not shown) into an AC voltage by the inverter circuit 32, for example, A switching element such as a FET is controlled by a switch, and a high-frequency voltage (for example, a rectangular wave) is input to a transformer, and is boosted by a transformer 31 and applied to each of the rare gas fluorescent lamps 10. -18- 201101367 (here, the external electrode 15 of each of the rare gas fluorescent lamps 10 is connected to GND. Further, the lamp lighting device has a control circuit 35, and the control circuit is provided with: The image information acquisition unit 3 6 of the image information S of the screen brightness and the image signal processing unit 3 7 that performs appropriate signal processing on the acquired image information S and outputs the image signal, and determines the image signal based on the image signal. The control signal generating portion 38 for the dimming control signal of the inverter circuit 32 is outputted by the brightness of each of the LD control areas Z1 to Z12. In the lamp unit, three rare portions at the same position in the direction of the center axis of the lamp are rare. The dimming of each of the LD control areas Z1 to Z12 of the gas fluorescent lamp 10 is specifically output by the control circuit 35, for example, in accordance with the brightness of the screen area corresponding to each of the LD control areas Z 1 to Z 1 2 . The dimming control signal is output to the inverter circuit 32 and is dimmed or turned off (functional dimming) in the dynamic range, and is performed in the respective LD control unit fields Z 1 to Z 1 2 , LD was implemented. A specific example of the configuration of the lamp unit is used. For example, when the screen size is a backlight of a 32-type LCD display device, the total length of each rare gas fluorescent lamp 10 is 190 mm, and the rare gas fluorescent lamp is 1 〇. The arrangement pitch of the center axis of the lamp is, for example, 10 mm, and the arrangement pitch of the direction perpendicular to the central axis of the lamp is, for example, 45 mm. In the above lamp unit, the light emitted from each rare gas fluorescent lamp i ' For example, through a diffusion plate, a directional control sheet, a diffusion sheet, etc., for example, a display device, etc., but a lamp of each rare gas fluorescent lamp 1 -19 -19- 201101367 The plane of the mandrel is separated from the diffusion plate. The distance is, for example, 20 to 3 Omm. Further, according to the lamp unit configured as described above, three rare gas fluorescent lamps 10 arranged adjacent to each other in the direction perpendicular to the lamp center axis of the rare gas fluorescent lamp 10 are used as One unit unit performs lighting control to configure dimming in the direction of the lamp axis. Therefore, for example, a display device such as a liquid crystal can be stably illuminated with uniform light, and each rare gas fluorescent lamp 10 is as much as possible. In order to reduce the number of ways in which the non-light-emitting field is formed, for example, a lamp unit of an external electrode type rare gas fluorescent lamp that is conventionally known, for example, a rare gas fluorescent lamp having a size of about 35 mm is required. The distance between the plane of the center axis of the lamp and the diffuser plate is reduced to, for example, 25 mm, that is, the diffuser plate can be disposed close to the ground of the lamp group, so that the lamp unit can be miniaturized. (Embodiment) FIG. 6 is a schematic explanatory view showing a configuration of another example of the rare-light fluorescent lamp unit for backlight of the present invention using the external-electrode-type rare gas U-body fluorescent lamp shown in FIG. The seventh drawing is a block diagram schematically showing a part of a configuration example of the lamp lighting device of the rare gas fluorescent lamp unit shown in Fig. 6. The rare gas camping lamp unit (light unit) for backlighting is a plurality of external electrode type rare gas fluorescent lamps 20 of the second embodiment, and for example, there are nine states in which the lamp center axes are extended in parallel with each other. The arrangement method is two-dimensionally arranged in parallel (and set), and the light irradiation field LA which is uniformized by the amount of light is obtained by the dimming method of LD -20-201101367, for example, four directions are divided into the center axis direction of the lamp, When a total of 12 LD control unit fields Z 1 to Z 1 2 are divided into three in a direction perpendicular to the central axis of the lamp, for a LD control unit field, a plurality of rare gases such as three adjacent to each other are adjacent to each other. The light in the light-emitting region of the divided electrode in which the lamp center axis directions of the fluorescent lamps 20 are arranged at the same position is radiated. The lamp lighting device for lighting each of the rare gas fluorescent lamps 20 is basically the same as that shown in FIG. 5, and is provided for each field of the plurality of LD control unit fields Z 1 to Z 1 2 . The illuminating field of each of the three rare gas fluorescent lamps 10 in which the LD control unit field is irradiated with light is used as a unit unit for lighting control, a common driving circuit (LD control circuit) 30 used, and an image having The information acquisition unit 36, the image signal processing unit 37, and the control circuit 35 of the control signal generation unit 38. Each of the drive circuits 30 illuminates the rare gas by applying a high-frequency voltage (rectangular wave voltage) between the external electrode 15A constituting each of the rare gas fluorescent lamps 20 and the branching electrode of the other external electrode 15B. The light source 10 is provided with the output side connected to the divided electrodes 16A (16B to 16D) of, for example, three rare gas fluorescent lamps 20 that are irradiated with light to one LD control unit area, and the input side is connected to The transformer 31 of the inverter circuit 32 is configured to convert a DC voltage of several tens of volts to several hundreds of volts supplied from a DC power source (not shown) into an AC voltage by the inverter circuit 32, for example, by a switch. A switching element such as a FET is controlled, and a high-frequency voltage (for example, a rectangular wave) is input to the transformer 31, and is boosted by the transformer 31 and applied to each of the rare gas fluorescent lamps 20. In the case of -21 - 201101367, one of the external electrodes 15A of each of the rare gas fluorescent lamps 20 is connected to GND. In the lamp unit, the respective LD control unit fields Z1 to Z12 of the divided electrodes 16A (16B to 16D) at the same position in the lamp center axis direction of each of the three rare gas fluorescent lamps 20 adjacent to each other are adjusted. Light, specifically, by the control circuit 35, for example, a dimming control signal outputted in response to the brightness of the screen area corresponding to each of the LD control areas Z1 to Z1 2 is output to the inverter circuit 32, The dynamic range dimming or lighting off (functional dimming) is performed separately for each LD control unit field Z 1 to Z 1 2 , whereby the LD is executed. A specific configuration example of the lamp unit is used. For example, when the screen size is a backlight of a 32-type LCD display device, the length of each of the rare gas fluorescent lamps 20 is 780 mm, and the outer diameter is 10 mm. The total length of the electrodes 6A to 16D is, for example, 180 mm, the distance between the adjacent divided electrodes is 1 〇mm, and the arrangement distance of the rare gas fluorescent lamps 20 is 45 mm. The distance between the plane at which the center axis of the lamp of each of the rare gas fluorescent lamps 2 of the above lamp unit is located and the diffusion plate is, for example, 20 to 30 mm. In addition, according to the lamp unit of the above-described configuration, the divided electrodes of the three rare gas fluorescent lamps 10 adjacent to each other having the same position in the center axis direction of the lamps are individually controlled as one unit, and the lamp shaft can be configured. In the case of dimming in the direction, for example, a display device such as a liquid crystal can be stably illuminated with uniform light, and each of the rare gas fluorescent lamps 20 is configured to reduce the non-light-emitting region as much as possible. For the well-known -22-201101367 lamp unit for external electrode type rare gas fluorescent lamp, for example, a plane and a diffuser plate where the center axis of the lamp of each rare gas fluorescent lamp 10 of about 35 mm is required The separation distance is reduced to, for example, 25 mm, that is, the diffusion plate can be disposed close to the ground of the lamp group, so that the lamp unit can be miniaturized. The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the external electrode type rare gas fluorescent lamp according to the first embodiment of the present invention is not limited to a component in which the starting electrode is provided in a portion of the end portion. The number and arrangement pattern of the rare gas fluorescent lamps constituting the rare gas fluorescent lamp unit of the present invention are not limited to the above-described constituents, and the number of unit areas of the LD control unit and the lamp lighting device are set. The composition is also not particularly limited. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic explanatory view showing a configuration of an example of an external electrode type rare gas fluorescent lamp of the present invention. Fig. 1(a) is a view showing a break along the center axis of the lamp. In the cross-sectional view of the surface, Fig. 1(b) is an end view of the line AA of Fig. 1(a), and Fig. 1(c) is an end view of line BB of Fig. 1(a). Fig. 2 is a graph showing the results of measurement of the height distribution in the end region of the side where the starting electrode of the external electrode type rare gas fluorescent lamp produced in the experimental example is disposed. Fig. 3 is a schematic explanatory view showing a configuration of another example of the external electrode type rare gas fluorescent lamp of the present invention, and the third embodiment (a) is a cross section along the central axis of the lamp. In the cross-sectional view, the (b) is an end view of the DD line of the third (a) drawing, and the third (c) is an end view of the EE line of the third (a) drawing. Fig. 4 is a schematic explanatory view showing a configuration of an example of a rare gas fluorescent lamp unit for backlight according to the present invention, which is an external electrode type rare gas fluorescent lamp shown in Fig. 1. Fig. 5 is a block diagram schematically showing a part of a configuration example of a lamp lighting device of the rare gas fluorescent lamp unit shown in Fig. 4. Fig. 6 is a schematic explanatory view showing a configuration of another example of the rare-light fluorescent lamp unit for backlight of the present invention using the external electrode type rare gas fluorescent lamp shown in Fig. 3. Fig. 7 is a block diagram schematically showing a part of a configuration example of a lamp lighting device of the rare gas fluorescent lamp unit shown in Fig. 6. [Description of main component symbols] 10: External electrode type rare gas fluorescent lamp 1 1 : Glass bulb 1 2 : Phosphor layer 1 5 A : - Square external electrode 15B: The other external electrode 16A to 16D: Split electrode 1 8: Starting electrode 1 8 A : Starting part 20: Rare gas fluorescent lamp-24- 201101367 3 0 : Driving circuit (LD control circuit) 3 1 : Transformer 3 2 : Inverter circuit 3 5 : Control circuit 3 6 : Image information acquisition unit 3 7 : Image signal processing unit 3 8 : Control signal generation unit C : Tube axis of glass bulb (lamp center axis) LA : Light irradiation field Z1 to Z12 : LD control unit area S : Portrait information
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