1286777 九、發明說明： 【發明所屬之技術領域】 本發明是有關於-種照明裝置及反射構件，應用於液 晶顯示裝置的背光燈等。 【先前技術】 在省知技術令，作為液晶顯示裝置等的背光燈等所使 用的照置，有—種直下型的背光燈。财下型背光燈 知用在作為軸發光面的面狀擴散構件之擴散板的背後 直下）配置光源，而且在其f後配置將該杨的光向擴 放板侧進行反射的反射面之構成。 綠照明裝置，如其發光面的光為不均勻的光，例如 /且衫的光，則會在液晶顯示裝置的晝面上產生輝度 害晝面品質。因此’在這種照崎置中，要求具有 在發光面整體輝度分布均勻的良好發光品質。 而，2知技射，作為上述_裝置之光源倾的反射 合屬H 具有彻金屬的紐等所得狀光澤表面的 反射片^ ’⑵成形為波形或山形的反射板，⑺擴散 反射片4 (例如參照專利文獻卜2)。 〈日本專利早期公開之特開平5—61043號 SI:工〕頁)日本專利早期公開之特開平6-25°178 反射用上述⑴的金輕澤片之照明裝置中， 又π，但因為金屬光澤面將光源的光進行正反 14155pif ^286777 射，所以燈影的消除困難。而且，在利用上述⑵的反射 板的情況下’反射板的形狀複雜，且難以設定使發光品質 提高的最佳形狀，另外還存在反射板需要加卫、需要以高 精度設定光源和反射板形狀的位置關係之問題。而且，在 利用上述（3)的擴散反射片的情況下，因為將來自光源的 光進行擴散反射，所以可得到較前述（1)、（2)良好的發 光品質，但從製品品質方面出發，要求更高的發光品質。 【發明内容】 ' 〜本發明的目的是提供一種鑒於上述問題而形成的，可 得到更高發光品質的照明裝置及反射構件。 本發明之照明裝置具有:形成發光面的擴散板 、在前述 :政板的背後所配置的光源、在前述光源的背後與前述擴 散板對向配置並將前述絲的光向前述擴散板侧進行反射 的擴散反射面，其特徵在於··在前述擴散反射面上，配置 有將透鏡面作為前述擴散板侧的透鏡層。 本+發明者發現，如利用採用上述這種構成的照明裝 ，藉由在前述擴散反射面上將透鏡面作為前述擴散板側 =配，透鏡層，可使前述擴散板所射出之光的分布均勻， 2到鬲發光品質。即，本發明者實驗發現，藉由在前述擴 布面上配置透鏡層，可使前述擴散板所射出之光的分 艾侍均勻，並根據該見解而完成本發明。 整而且，在上述照明裝置中，前述透鏡層也可將其大致 光與則述擴散反射面一體設置。在這種情況下，即使 ’、七出的熱加在透鏡層上，由於前述透鏡層與前述擴散1286777 IX. Description of the Invention: [Technical Field] The present invention relates to a lighting device and a reflecting member, and is applied to a backlight of a liquid crystal display device. [Prior Art] There is a direct type backlight that is used as a backlight for a liquid crystal display device or the like. In the case of the backlight type, it is known that the light source is disposed directly behind the diffusing plate of the planar diffusing member as the axial light emitting surface, and the reflecting surface of the light reflecting the light of the yang is reflected on the side of the expansion plate. . In the green lighting device, if the light on the light-emitting surface is uneven light, for example, the light of the shirt, the brightness of the surface of the liquid crystal display device is generated. Therefore, it is required to have a good light-emitting quality in which the overall luminance distribution is uniform on the light-emitting surface. 2, the technical projection, the reflection of the light source as the light source of the above-mentioned device, the reflection sheet of the shiny surface of the metal having a sharp metal, etc. (2) is formed into a wave shape or a mountain-shaped reflection plate, and (7) the diffusion reflection sheet 4 ( For example, refer to Patent Document 2). [Japanese Patent Laid-Open No. 5-61043, SI:] page) Japanese Patent Laid-Open No. 6-25°178. In the illumination device of the above-mentioned (1) gold light film, π, but because of metal The glossy surface will shoot the light of the light source 14155pif ^286777, so the elimination of the light shadow is difficult. Further, in the case of using the reflecting plate of the above (2), the shape of the reflecting plate is complicated, and it is difficult to set an optimum shape for improving the light-emitting quality, and the reflecting plate needs to be reinforced, and it is necessary to set the light source and the reflecting plate shape with high precision. The problem of positional relationship. Further, in the case of using the diffuse reflection sheet of the above (3), since the light from the light source is diffused and reflected, the light emission quality superior to the above (1) and (2) can be obtained, but from the viewpoint of product quality, A higher luminous quality is required. SUMMARY OF THE INVENTION An object of the present invention is to provide an illumination device and a reflection member which are formed in view of the above problems and which have higher illumination quality. An illuminating device according to the present invention includes: a diffusing plate that forms a light-emitting surface; a light source disposed behind the political panel; and a rear surface of the light source disposed opposite to the diffusing plate; and the light of the filament is directed toward the diffusing plate side The diffused reflection surface of the reflection is characterized in that a lens layer having a lens surface as the diffusion plate side is disposed on the diffusion reflection surface. The present inventors have found that, by using the illumination device having the above-described configuration, the distribution of light emitted from the diffusion plate can be obtained by using the lens surface as the diffusion plate side on the diffuse reflection surface. Uniform, 2 to 鬲 luminous quality. That is, the inventors have experimentally found that by arranging the lens layer on the above-mentioned spread surface, the light emitted from the diffusing plate can be made uniform, and the present invention has been completed based on the findings. Further, in the above illumination device, the lens layer may be provided integrally with the diffuse reflection surface. In this case, even if the heat of the 'yellow' is applied to the lens layer, the aforementioned lens layer and the aforementioned diffusion
Hl55pif 1286777 ，設置’所以也可防正前述透鏡層_曲和歪斜 等變形，並可防止财述擴肢射㈣部分分離。藉此， 可防止别述擴散反射面和前述透鏡層間 ”使它們之間的光的折射保持穩定。因此=:穩 疋的反射光，並形成高發光品質。 而在上述照明裝置中，前述透鏡層具有耐光性為 在這種情況下，即使前述透鏡層接受來自前述光源的 糸外線，也可利用其耐光性而防止透鏡層劣化。因此，能 夠防止該照明裝置的輝度和發光品質等的經時性下降。 而且，本發明的反射構件為與形成發光面的擴散板對 向配置，並將在前述反射構件與前述擴散板間所配置之光 源發出的光向前述擴散板進行反射，其特徵在於前述反射 構件··包括將前述光源的光進行反射之擴散反射層、形成 在前述反射層上的透鏡層。 “如利用象上述這樣構成的反射構件，藉由將來自前述 光源的光利用前述擴散反射層進行擴散並反射，且使該反 射光通過前述透鏡層，可使射出的射出光均勻地進行反 射。因此’適合作為前述照明裝置的反射面使用。 如上所述，如利用關於本發明之照明裝置及反射構 件，藉由在擴散反射面上設置透鏡層，可得到在發光面整 體上輝度分布均勻的高發光品質。 為讓本發明之上述和其他目的、特徵和優點能更明顯 易懂’下文特舉較佳實施例，並配合所附圖式，作詳細說 明如下。 l4l55pif 1286777 【實施方式】 下面’參照所附圖示對本發明的較佳實施形態進行說 明。另外’在以下的說明中，是以將本發明的照明裝置適 用於例如液晶顯示裝置的背面侧所配置之對應1G英寸的 直下型背光燈的場合，作為例子進行說明。圖〗所示為關 於本發明的第-實施形態之直下型背紐構造賴式斷面 圖該直下型彦光燈1包括一面開口的箱狀框架11、以堵 塞前述^口之形態進行配置的作為面狀擴散構件的擴散板 12、在前述擴散板12的背後（直下）所配置之光源13。 擴散板12使用例如聚碳酸酯、丙烯等白色或乳白色的 板狀體。在本實施形態中，使用三菱麗陽(RAY〇N)(公司） 制的商品名〔aCryliteN〇432〕的丙烯樹脂板，其板厚設定 為2mm。此時該擴散板12的光透過率表示為3〇%。這種 擴政板12以堵塞上述框架11的開口之形態進行配置，且 可使從背後所設置之光源13發出的光進行擴散並透過。利 用這種擴散板12，可使光源13發出的光均勻，並從擴散 板12的發光面12a射出。 圖2為將關於本實施形態的直下型背光燈的擴散板a 拆除之狀態的平面圖。光源13如圖2所示，包括4支例如 使直徑3mm的管狀體形成U字狀之冷陰極管13a,並分別 被安裝在連接器13b上，且利用未圖示的燈支持座等被支 持而收納在框架11内。 冷陰極管13a的長邊部13al分別間隔2〇111„1而沿框架 左右方向略成平行地並列設置。而且，在光源上連接有 14155pif 8 1286777 15a，所以使其安裝性提高。而且，該反射構件18不只可 作為本實施形態這樣的直下型背光燈的反射面，也可適用 於例如室内用照明機器的反射面、其它類似照明機器的反 射板。 而且，在反射構件18中，叠合有透鏡片16的反射面 15a藉由利用白色系的擴散反射片15而形成擴散反射面。 在這種情況下，由於反射面15a可使來自光源13的光擴散 且進行反射，並使該反射光通過透鏡片16而射出，所以可 對擴散板射出均勻的反射光。藉此，可提高在發光面 12a的發光品質。 而且’在本實施形態中，在框架11的内壁側面lla的 反射面上，不使用具有透鏡片16的反射構件18。這是因 為，雖然在内壁侧面lla上使用反射構件18的情況下，作 為製品也可得到沒有什麼特別問題的良好發光品質，但在 内壁侧面lla上不使用反射構件18的場合，可得到更加良 好的發光品質。 下面，對本發明者進行的，針對關於上述實施形態的 直下型背光燈而進行的測試結果加以說明。 〜 作為實施樣品使用上述實施形態的直下型背光燈，作 為比較樣品使用在擴散反射片15的反射面i5a上不具有透 鏡片16之直下型背光燈’對發光面i2a的輝度和發光品質 進行實驗測定並加以評價。其結果如下面的表〗所示。 14155pif 11 1286777 反射面 背光燈 的尺寸 厚度τ (mm) 發光品質 輝度 (cd/m2 色度 比較樣 品 實施樣 品 無透鏡 有透鏡 15 15Hl55pif 1286777, setting ', it is also possible to prevent deformation of the aforementioned lens layer _ 曲 and skew, and to prevent the partial expansion of the expanded limb (4). Thereby, it is possible to prevent the diffusion between the diffuse reflection surface and the aforementioned lens layer "to keep the refraction of light between them stable. Therefore =: stable reflected light and high illumination quality. In the above illumination device, the aforementioned lens The layer has light resistance. In this case, even if the lens layer receives the outer line from the light source, the lens layer can be prevented from being deteriorated by the light resistance. Therefore, it is possible to prevent the brightness and the light quality of the illumination device. Further, the reflection member of the present invention is disposed to face the diffusion plate that forms the light-emitting surface, and reflects light emitted from the light source disposed between the reflection member and the diffusion plate to the diffusion plate. The reflection member includes a diffusion reflection layer that reflects light of the light source, and a lens layer formed on the reflection layer. "If a reflection member configured as described above is used, light from the light source is utilized by the aforementioned The diffuse reflection layer is diffused and reflected, and the reflected light is passed through the lens layer to uniformly emit the emitted light. Line reflection. Therefore, it is suitable for use as a reflecting surface of the aforementioned lighting device. As described above, by providing the illuminating device and the reflecting member according to the present invention, by providing the lens layer on the diffuse reflection surface, it is possible to obtain a high illuminating quality in which the luminance distribution is uniform over the entire illuminating surface. The above and other objects, features, and advantages of the present invention will become more apparent <RTIgt; L4l55pif 1286777 [Embodiment] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the illumination device of the present invention is applied to, for example, a direct-lit backlight of 1 G inch disposed on the back side of the liquid crystal display device, and will be described as an example. FIG. 1 is a cross-sectional view of a direct-type back-up structure according to a first embodiment of the present invention. The direct-type bevel light 1 includes a box-shaped frame 11 that is open on one side, and is arranged to block the above-mentioned port. The diffusing plate 12 as a planar diffusing member and the light source 13 disposed on the back (downward) of the diffusing plate 12 are provided. As the diffusion plate 12, for example, a white or milky white plate-like body such as polycarbonate or propylene is used. In the present embodiment, an acrylic resin sheet of the trade name [aCrylite N〇 432] manufactured by Mitsubishi Rayon (company) was used, and the thickness thereof was set to 2 mm. At this time, the light transmittance of the diffusing plate 12 is represented by 3% by mass. The expansion board 12 is disposed in such a manner as to block the opening of the frame 11, and the light emitted from the light source 13 provided on the back surface can be diffused and transmitted. With this diffusion plate 12, the light emitted from the light source 13 can be made uniform and emitted from the light-emitting surface 12a of the diffusion plate 12. Fig. 2 is a plan view showing a state in which the diffusion plate a of the direct type backlight of the embodiment is removed. As shown in FIG. 2, the light source 13 includes four cold cathode tubes 13a having a U-shaped tubular body of 3 mm in diameter, and is attached to the connector 13b, respectively, and is supported by a lamp holder or the like (not shown). It is housed in the frame 11. The long side portions 13a1 of the cold cathode tubes 13a are arranged side by side in parallel in the left-right direction of the frame at intervals of 2〇111„1. Further, 14155pif 8 1286777 15a is connected to the light source, so that the mountability is improved. The reflection member 18 can be applied not only to the reflection surface of the direct type backlight as in the present embodiment, but also to a reflection surface of an indoor illumination device or another reflection plate similar to an illumination device. Further, in the reflection member 18, the reflection member 18 is laminated. The reflecting surface 15a having the lens sheet 16 forms a diffuse reflecting surface by using the white diffusing reflection sheet 15. In this case, since the reflecting surface 15a allows the light from the light source 13 to be diffused and reflected, and the reflection is made Since the light is emitted through the lens sheet 16, uniform light can be emitted to the diffusing plate, whereby the light-emitting quality of the light-emitting surface 12a can be improved. Further, in the present embodiment, the reflecting surface of the inner wall side surface 11a of the frame 11 is formed. In the above, the reflection member 18 having the lens sheet 16 is not used. This is because, although the reflection member 18 is used on the inner wall side surface 11a, it can be obtained as a product. There is a problem of good light-emitting quality, but when the reflection member 18 is not used on the inner wall side 11a, a more excellent light-emitting quality can be obtained. Next, the inventors of the present invention are directed to the direct type backlight of the above embodiment. The results of the tests performed are described below. The direct-type backlight of the above-described embodiment is used as the sample for the comparison, and the direct-type backlight 'the light-emitting surface i2a which does not have the lens sheet 16 on the reflection surface i5a of the diffuse reflection sheet 15 is used as a comparative sample. The luminance and luminescence quality were experimentally measured and evaluated. The results are shown in the following table. 14155pif 11 1286777 Reflective surface backlight thickness τ (mm) Luminous quality luminance (cd/m2 chromaticity comparison sample implementation sample no Lens with lens 15 15
X 〇 9775 9639 x=0.3134 y=0.3347 x=0.3200 y=0.3433 ----______I 在表1中，比較樣品和實施樣品在除 以外ΐ全相_條件下進行職。藉此可知輝 無娜疋比較樣品還是實施樣品都大致相等。、、収品Γ所示為對發光面仏的輝度分布進行 ^疋之、果的—個例子。圖4 (a)所示為對比較例品的發 進行測定之結果的曲線圖，圖4㈦所示 為對實域的發光面的輝度分布 :右:=:布如圖4(c)所示，表示以= 4 Γ=ΡΧ1—X2線之輝線的分布進行測定的 “的輝度分定結果表示發光面上下 位置，縱軸表示輝ί線圖中’輪轴表示χι—χ2線上的 由^圖4 (a)可知，比較樣品的輝 個區域都呈現如圖中虛線γ包圍之部分所示的、 14155pif 12 1286777 的波長進行波動這種增減形態。這種情況可認為是出現了 光源13的燈影，不能說發光品質良好。另一方面，實施樣 品與比較樣品相比，呈現一種平穩且均勻的分布狀態，可 以說具有良好的發光品質。這樣，可確認在實施樣品即關 於本形態之直下型背光燈1中，能夠得到光源13的燈影表 現不明顯之發光品質高的狀態。 如上所述，由實驗結果可知，關於本實施形態之直下 型为光燈1猎由在框架11的底面lib，使用在擴散反射片 15的反射® 15a的面上配置透鏡片16之反射構件18，可 將從光源13向反射面15a射出的光適當地進行反射，並使 擴散板12所射出之光的分布保持均句，所以可不損 及色度而得到高發光品質。 、 又 —也、口J且,s月尤燈丨中，如上所述 =用將擴散反射片15和透鏡片16這種低成本的 別精後地進行定位，而以簡便的方法進行固定即可 能夠提供抑制成本且發光品質高的直下型背光严。 在圖1中，準備了藉由變更光源‘ 散板12的間隔t而使直下㈣故 m源13和: 同的2種（15mm、18mm)，進 予度尺寸T各不: 下述表2所示。 #的實驗。其結果女 14155pif 13 1286777 [表2]X 〇 9775 9639 x=0.3134 y=0.3347 x=0.3200 y=0.3433 ----______I In Table 1, the comparative sample and the implemented sample were subjected to the ΐ full phase _ condition. From this, it can be seen that the comparison sample or the implementation sample are substantially equal. The product Γ is shown as an example of the luminance distribution of the luminescent surface. Fig. 4 (a) is a graph showing the results of measurement of the hair of the comparative example, and Fig. 4 (7) is a luminance distribution of the light emitting surface of the real domain: right: =: cloth as shown in Fig. 4 (c) , which indicates that the luminance distribution is measured by the distribution of the radiance of the line of = 4 Γ = ΡΧ1 - X2, and the vertical axis represents the position of the illuminating surface, and the axis represents the χι-χ2 line. 4 (a) It can be seen that the illuminating region of the comparative sample exhibits the fluctuation of the wavelength of 14155pif 12 1286777 as shown by the dotted line γ in the figure. This case can be considered as the occurrence of the light source 13 The light shadow can not be said to have good illuminating quality. On the other hand, the sample is stable and uniform in distribution compared with the comparative sample, and it can be said that it has good illuminating quality. Thus, it can be confirmed that the sample is applied directly under the present embodiment. In the backlight 1 of the type, it is possible to obtain a state in which the illuminating quality of the light source 13 is not conspicuous, and the illuminating quality is high. As described above, it is understood from the experimental results that the direct type of the light source 1 is hunted by the bottom surface lib of the frame 11. ,use The reflection member 18 of the lens sheet 16 is disposed on the surface of the reflection plate 15a of the diffuse reflection sheet 15, and the light emitted from the light source 13 to the reflection surface 15a can be appropriately reflected, and the distribution of the light emitted from the diffusion plate 12 can be maintained. Since the sentence is uniform, the illuminance can be obtained without damaging the chromaticity. Moreover, the mouth is also the same, and the s-month is in the middle of the lamp. As described above, the low-efficiency of the diffusing reflection sheet 15 and the lens sheet 16 is used. By positioning in a precise manner and fixing it in a simple manner, it is possible to provide a direct type backlight with high cost and high luminous quality. In Fig. 1, the interval t of the light source 'scattering plate 12 is changed. Straight down (four), m source 13 and: the same two kinds (15mm, 18mm), the degree of tolerance T is not: The following Table 2. The experiment of #. The result female 14155pif 13 1286777 [Table 2]
=全Ϊ同的條件下進行測定。結果，儘管在實施樣品 中^度尺寸Τ小，但發光品f、輝度都與比較樣品相同。 在表2中，比較樣品和實施樣品在除了框架u的内壁 底面之透鏡片16的有無及該直下型背光燈丨的厚度尺寸τ ΪΓ ST 13和缝板12的間隔t小，則存在發光品 、心化、》但由該表可知，即使在這種情況下，藉由 使用在反射面15a #面上配置了透鏡片16之反射構件 18，也可將發光品質和輝度維持在與比較樣品同等的水 平。即，本實施形態的直下型背光Si藉由利用配備了透 鏡片16的反射構件18而提高發光品質，可使直下型 燈1的薄型化成為可能。 而且，本發明者對利用本發明之直下型背光燈 1的輝 度提高進行了驗證。其結果如下述表3所示。 14155pif 14 1286777 [表3]= Measured under the same conditions. As a result, although the size was small in the sample to be tested, the illuminant f and the luminance were the same as those of the comparative sample. In Table 2, in the comparison sample and the sample, the presence or absence of the lens sheet 16 except the bottom surface of the inner wall of the frame u and the interval t of the thickness τ ΪΓ ST 13 of the direct type backlight 和 and the slit 12 are small, and the illuminating product exists. It is known from the table that even in this case, by using the reflecting member 18 in which the lens sheet 16 is disposed on the reflecting surface 15a # surface, the illuminating quality and luminance can be maintained in comparison with the sample. The same level. In other words, the direct type backlight Si of the present embodiment can improve the light-emitting quality by using the reflection member 18 provided with the lens 16, and the thickness of the direct-type lamp 1 can be reduced. Further, the inventors verified the improvement in luminance of the direct type backlight 1 using the present invention. The results are shown in Table 3 below. 14155pif 14 1286777 [Table 3]
所以即使使用含有使發光品質低下的要因之光透過率高的 擴散板12，也可維持與比較樣品同等的發光品質。即，本 實施形態的直下型背光燈1可利用發光品質的提高而使用 光透過率高的擴散板，且作為結果可使輝度提高。 圖5為關於本發明的第二實施形態之直下型背光燈内 壁底面構造的模式斷面圖。本實施形態與第一實施形態的 主要不同點在於，藉由將透鏡片16和擴散反射片15利用 枯著劑等大致全面粘著，而形成在擴散反射片15的反射面 15a的面上一體設置透鏡層之反射構件18。其它方面與第 一實施形態相同，所以省略說明。 14155pif 15 1286777 在這種情況下，在反射構件18中，通過利用枯著劑的 粘著層17，作為透鏡層的透鏡片16被粘著在反射面l5a 的大致整個面上而形成一體。該粘著層17在將擴散反射片 15和透鏡片16進行粘著的狀態下，為略透明較佳，可使 用在粘著層17將兩者穩定粘著的狀態下為略透明這樣的 粘著劑。 透鏡片16配置在冷陰極管13a的附近，所以暴露在因 該冷陰極管13a產生的熱等所造成之溫度較高的環境下。 因為透鏡16㈣明樹脂等成形，所以在這種溫度較高的 壞境下’容易產生輕曲和歪斜等變形。 但是’在本實施形態的反射構件18中，由於將透鏡片 16在反射面15a的整個面上一體式枯著，所以即使冷陰極 管13a產生的熱施加到透鏡片16上，也可防止透鏡片16 的變形’並可防止從反射φ 1Sa的部分分離。藉此，可防 止反射面15a和透鏡片16之間的空間變得不均勻，並使它 們之間的光的折射等保持敎。因此，可得到穩定的反射 光’並形成高發光品質。 圖6所示為關於本發明的第三實施形態之直下型背光 燈内壁底面構造的模式斷面圖。本實施形態與第二實施形 態的主要不同點在於’形成-種則uv硬化樹脂在擴散 反射片15的反射面15a的大致整個面上直接—體形成透鏡 層I6之反射構件I8。其它方面與第二實施形態相同，所 以省略說明。 利用該UV硬化樹脂的透鏡層16象下面這樣形成。 14155pif 16 1286777 即’在擴散反射片15的反射面15a的面上以適當的厚度塗 敷UV硬化樹脂。而且，利用凸版的金屬鑄模等在表面例 如以等間距形成複數個微細的斷面三角形狀的透鏡條。然 後，藉由照射紫外線而使UV硬化樹脂硬化，並形成透鏡 層16 〇 當使用這種反射構件18時，除了可防止在透鏡層16 上產生鍾曲和歪斜等變形並從反射面15a部分分離以外， 由於在擴散反射片15和透鏡層16之間不存在粘著層，所 以不會使來自擴散反射片15的反射光白白地衰減。因此， 可得到更加合適的反射光。 另外，本發明的照明裝置及反射構件，並不限定於上 述實施形態，透鏡層的形狀、材質、配置、反射層的材質、 反射構件的構成、材質、照明裝置的構成等，可根據本發 明的意旨酌情進行變更。 雖然本發明已以較佳實施例揭露如上，然其並非用以 限^本發明，任何熟習此技藝者，在不脫離本發明之精神 =範圍内，當可作些許之更動與潤飾，因此本發明之保護 範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 圖1所示為關於本發明的第一實施形態之直下型背光 燈構造的模式斷面圖。 圖2為將圖1中的直下型背光燈1的擴散板12拆除之 狀態的平面圖。 圖3所示為圖1中以虛線A包圍的部分之斷面的模式 14155pif 17 1286777 擴大圖。 +圖4 (a)所示為對比較例品的發光面的輝度分布進行 測定之結果的曲線圖，目4 (b)所示為對實闕品的發光 面的輝度分布進行測定之結果的曲線@，圖4 (〇為用於 說明對輝度的分布崎測定之位㈣直下型背光燈的平面 圖。 圖5為關於本發明的第二實施形態之直下型背光燈内 壁底面構造的模式斷面圖。 圖6為關於本發明的第三實施形態之直下型背光燈内 壁底面構造的模式斷面圖。 【主要元件符號說明】 I :直下型背光燈 II :框架 11a :内壁侧面 lib :内壁底面 12 ·擴散板 12a :發光面 13 :光源 13a :冷陰極管 13al :長邊部 13b :連接器 14 :擴散反射片 15:擴散反射片（擴散反射層） 14155pif 18 1286777 15a :反射面 16 :透鏡片（透鏡層） 16a :透鏡條 16b :透鏡面 16c :耐光層 17 :粘著層 18 :反射構件 14155pifTherefore, even if the diffusing plate 12 having a high light transmittance which is a factor for lowering the light-emitting quality is used, the same light-emitting quality as that of the comparative sample can be maintained. In other words, in the direct type backlight 1 of the present embodiment, a diffusing plate having a high light transmittance can be used by improving the light-emitting quality, and as a result, the luminance can be improved. Fig. 5 is a schematic cross-sectional view showing the structure of the bottom surface of the inner wall of the direct type backlight according to the second embodiment of the present invention. The present embodiment is mainly different from the first embodiment in that the lens sheet 16 and the diffuse reflection sheet 15 are integrally adhered to each other by a drying agent or the like, and are formed integrally on the surface of the reflection surface 15a of the diffusion reflection sheet 15. A reflection member 18 of the lens layer is provided. Since the other points are the same as those of the first embodiment, the description thereof is omitted. 14155pif 15 1286777 In this case, in the reflection member 18, the lens sheet 16 as the lens layer is adhered to substantially the entire surface of the reflection surface 15a by the adhesive layer 17 using the primer, and is integrally formed. In the state in which the diffusing reflection sheet 15 and the lens sheet 16 are adhered, the adhesive layer 17 is preferably slightly transparent, and it is possible to use a viscosity which is slightly transparent in a state where the adhesive layer 17 is stably adhered to the adhesive layer 17. Attention. Since the lens sheet 16 is disposed in the vicinity of the cold cathode tube 13a, it is exposed to an environment having a high temperature due to heat generated by the cold cathode tube 13a or the like. Since the lens 16 (four) is formed of a resin or the like, deformation such as buckling and skew is likely to occur in such a high temperature environment. However, in the reflection member 18 of the present embodiment, since the lens sheet 16 is integrally dried over the entire surface of the reflection surface 15a, the lens can be prevented even if heat generated by the cold cathode tube 13a is applied to the lens sheet 16. The deformation of the sheet 16 can prevent separation from the portion of the reflection φ 1Sa. Thereby, the space between the reflecting surface 15a and the lens sheet 16 can be prevented from becoming uneven, and the refraction of light or the like between them can be kept constant. Therefore, stable reflected light ' can be obtained and high luminous quality is formed. Fig. 6 is a schematic cross-sectional view showing the structure of the bottom surface of the inner wall of the direct type backlight according to the third embodiment of the present invention. The main difference between this embodiment and the second embodiment is that the uv hardening resin directly forms the reflection member I8 of the lens layer I6 on substantially the entire surface of the reflection surface 15a of the diffusion reflection sheet 15. The other points are the same as those of the second embodiment, and the description thereof will be omitted. The lens layer 16 using the UV hardening resin is formed as follows. 14155pif 16 1286777 That is, the UV curable resin is applied to the surface of the reflecting surface 15a of the diffuse reflection sheet 15 with an appropriate thickness. Further, a plurality of thin triangular cross-section lens strips are formed on the surface by a metal mold or the like of a relief, for example, at equal intervals. Then, the UV hardening resin is cured by irradiation of ultraviolet rays, and the lens layer 16 is formed. When such a reflection member 18 is used, in addition to preventing deformation such as bell curvature and skew on the lens layer 16, and partially separating from the reflection surface 15a. In addition, since there is no adhesive layer between the diffuse reflection sheet 15 and the lens layer 16, the reflected light from the diffuse reflection sheet 15 is not attenuated vainly. Therefore, more suitable reflected light can be obtained. Further, the illumination device and the reflection member of the present invention are not limited to the above-described embodiments, and the shape, material, arrangement, material of the reflection layer, configuration of the reflection member, material, and configuration of the illumination device of the lens layer may be according to the present invention. The intention is to change as appropriate. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and those skilled in the art can make some modifications and refinements without departing from the spirit of the invention. The scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a structure of a direct type backlight according to a first embodiment of the present invention. Fig. 2 is a plan view showing a state in which the diffusion plate 12 of the direct type backlight 1 of Fig. 1 is removed. Fig. 3 is a view showing a pattern of a section of a portion surrounded by a broken line A in Fig. 1 14155pif 17 1286777. Fig. 4 (a) is a graph showing the results of measuring the luminance distribution of the light-emitting surface of the comparative example, and the result of measuring the luminance distribution of the light-emitting surface of the solid product is shown in the fourth step (b). Curve @, Fig. 4 (〇 is a plan view for explaining the position of the distribution of luminance, and (4) a direct type backlight. Fig. 5 is a schematic sectional view showing the structure of the bottom surface of the inner wall of the direct type backlight according to the second embodiment of the present invention. Fig. 6 is a schematic cross-sectional view showing the structure of the bottom surface of the inner wall of the direct type backlight according to the third embodiment of the present invention. [Description of main components] I: direct type backlight II: frame 11a: inner wall side lib: inner wall bottom surface 12·Diffusing plate 12a: Light-emitting surface 13: Light source 13a: Cold cathode tube 13al: Long side portion 13b: Connector 14: Diffusion reflection sheet 15: Diffusion reflection sheet (Diffusion reflection layer) 14155pif 18 1286777 15a: Reflection surface 16: lens Sheet (lens layer) 16a: lens strip 16b: lens surface 16c: light-resistant layer 17: adhesive layer 18: reflective member 14155pif