201137267 1 w j /y/r/\ 1 » 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種光源模組，且特別是有關於一 種具有導光棒以均勻導光之光源模組。 【先前技術】 目前使用導光材質作為照明或提供光源的產品愈來 愈多。傳統的設計之一係在導光棒之一端設置光源，當 光源發射光線進入導光棒時，經由導光棒的導光設計引 導光線出光。 然而，進入導光棒之光線，依據進入導光棒後所行 走的距離不同而在各個位置產生不同的強度。例如，通 常是在靠近光源的部份導光棒的出光較強，遠離光源的 部份導光棒的出光較弱，導致導光棒產生出光強弱不均 的情形。 【發明内容】 本發明係有關於一種光源模組，包括一導光棒。光 源模組透過導光棒中的連續擴散層及彼此分離設置的擴 散部之設計，可使進入到導光棒的光線更均勻地出光。 根據本發明之一方面，提出一種光源模組。光源模 組包括一導光棒、一第一光源及一第二光源。導光棒具 有一周緣面及相對應之一第一端與一第二端並包括一連 續擴散層及複數擴散部。連續擴散層位於周緣面並位於 第一端與第二端之間，連續擴散層用以將光線導出導光 棒。擴散部係分離地位於周緣面並位於第一端與連續擴 201137267201137267 1 wj /y/r/\ 1 » VI. Description of the Invention: [Technical Field] The present invention relates to a light source module, and more particularly to a light source module having a light guiding rod for uniformly guiding light group. [Prior Art] At present, there are more and more products using light guiding materials as illumination or providing light sources. One of the conventional designs is to provide a light source at one end of the light guiding rod. When the light source emits light into the light guiding rod, the light guiding light is guided through the light guiding design of the light guiding rod. However, the light entering the light guide bar produces different intensities at various locations depending on the distance traveled after entering the light guide bar. For example, it is common for a portion of the light guiding rod that is close to the light source to emit light, and a portion of the light guiding rod that is far away from the light source to emit light is weak, resulting in a situation in which the light guiding rod produces uneven light intensity. SUMMARY OF THE INVENTION The present invention is directed to a light source module including a light guide bar. The light source module can illuminate the light entering the light guiding rod more uniformly through the continuous diffusion layer in the light guiding rod and the diffusing portion disposed separately from each other. According to an aspect of the invention, a light source module is proposed. The light source module includes a light guiding rod, a first light source and a second light source. The light guiding rod has a peripheral surface and a corresponding first end and a second end and includes a continuous diffusion layer and a plurality of diffusion portions. A continuous diffusion layer is located on the peripheral surface between the first end and the second end, and the continuous diffusion layer is used to direct light out of the light guiding rod. The diffuser is separately located on the peripheral surface and is located at the first end and continuously expands 201137267
* iwo/y/pX 散層之間以及第二端與連續擴散層之間，擴散部用以將 光線導出導光棒。第一光源及第二光源分別鄰近第一端 及第二端設置，用以發射光線進入導光棒。其中，連續 擴散層的面積大於該些擴散部的鋪設面積。 為讓本發明之上述内容能更明顯易懂，下文特舉較 佳實施例，並配合所附圖式，作詳細說明如下： 【實施方式】 以下係提出較佳實施例作為本發明之說明，然而實 ® 施例所提出的内容，僅為舉例說明之用，而繪製之圖式 係為配合說明，並非作為限縮本發明保護範圍之用。再 者，實施例之圖示亦省略不必要之元件，以利清楚顯示 本發明之技術特點。 第一實施例 請參照第1圖，其繪示依照本發明第一實施例之光 源模組的示意圖。光源模組100包括導光棒102、第一光 • 源104及第二光源106。導光棒102具有周緣面112及相 對應之第一端114與第二端116並包括連續擴散層108、 數個第一擴散部110及數個第二擴散部118。周緣面112 為導光棒102中第一端114與第二端116之間的外側表 面。 導光棒102的截面形狀可以是圓形、橢圓形或多邊 形。在本實施例中，導光棒102的截面形狀係以圓形為 例作說明。導光棒102的材質例如是聚碳酸脂樹脂 (Polycarbonate, PC)、聚甲基丙烯酸曱酯（PMMA)、聚 *· 1 201137267* Between the iwo/y/pX layers and between the second end and the continuous diffusion layer, the diffuser is used to direct the light out of the light guide. The first light source and the second light source are respectively disposed adjacent to the first end and the second end for emitting light into the light guide bar. Wherein, the area of the continuous diffusion layer is larger than the laying area of the diffusion parts. In order to make the above description of the present invention more obvious, the following detailed description of the preferred embodiments of the present invention will be described in detail as follows: [Embodiment] The following is a description of the preferred embodiments. However, the contents of the present invention are for illustrative purposes only, and the drawings are for illustrative purposes and are not intended to limit the scope of the invention. Further, the illustration of the embodiments also omits unnecessary elements to clearly show the technical features of the present invention. First Embodiment Referring to Figure 1, there is shown a schematic view of a light source module in accordance with a first embodiment of the present invention. The light source module 100 includes a light guide bar 102, a first light source 104, and a second light source 106. The light guiding rod 102 has a peripheral surface 112 and corresponding first end 114 and second end 116 and includes a continuous diffusion layer 108, a plurality of first diffusion portions 110 and a plurality of second diffusion portions 118. The peripheral surface 112 is the outer surface between the first end 114 and the second end 116 of the light guiding rod 102. The cross-sectional shape of the light guiding rod 102 may be circular, elliptical or polygonal. In the present embodiment, the cross-sectional shape of the light guiding rod 102 is exemplified by a circular shape. The material of the light guiding rod 102 is, for example, polycarbonate resin (PC), polymethyl methacrylate (PMMA), poly *· 1 201137267
里 w)/y/rA 對苯二甲酸乙二酯（p〇lyethylene terephthalate， PET)、玻璃或其它透光材質。 導光棒102的周緣面112可連接第一端114與第二 端116。連續擴散層1〇8位於周緣面112 散部U0及該些第二擴散部118係'彼此分離地二擴 面112上。 第一光源104及第二光源1〇6分別 及第二端麵置，其中，第一光源 分別用以發射光線L1及光線L2進入導光棒1〇2中原 土連，擴散層/08大致上位於導光棒1〇2中離光源較 运的區域，例如是第一端丨14盥第_ ’、 第-擴散部⑴位於第-端m與二的/二 ί:擴於第二端116與連續擴散層1(38之間。 八中連、，貝心散層108的面積大於第 設面積與第二擴散部118的舖設面積 鋪 光線L2接觸到連續擴散層1〇8、第田及 擴散部m時，峨散層108、第一擴 擴散部118，結構使光線U及光線L2產生反射ϋ 或漫射而被導出導光棒102外。 反耵擴政 連續擴散層108、第一檐·11Λ 可應用塗佈（apply)的方式形:及第二擴散部118 連續擴散層108、第一擴散部„及乂佳=但非限定地， (polycarbonate, PC)、氧化鈦& ^歹1是聚碳酸酯 的組合;或者是聚甲基丙埽酸甲醋 ―如6，腿）、氧化鈦與氧切的組合。 201137267w) / y / rA ethylene terephthalate (PET), glass or other light-transmitting materials. The peripheral surface 112 of the light guiding rod 102 can connect the first end 114 and the second end 116. The continuous diffusion layer 1〇8 is located on the peripheral surface 112 of the floating portion U0 and the second diffusion portions 118 are separated from each other by the two expanded faces 112. The first light source 104 and the second light source 1〇6 are respectively disposed on the second end surface, wherein the first light source is respectively configured to emit the light L1 and the light L2 into the original soil of the light guiding rod 1〇2, and the diffusion layer /08 is substantially Located in the light guide rod 1〇2, the area that is transported from the light source, for example, the first end 丨14盥 _ ', the first diffusion part (1) is located at the first end m and the second /2: expands to the second end 116 Between the continuous diffusion layer 1 and the 38, the area of the center layer is larger than the first area and the laying area of the second diffusion part 118. The light ray L2 is in contact with the continuous diffusion layer 1〇8, the field and In the case of the diffusion portion m, the diffusion layer 108 and the first diffusion diffusion portion 118 are configured such that the light ray U and the light ray L2 are reflected or diffused and are led out of the light guide bar 102. The 耵 diffusion expansion layer 108, first檐·11Λ Applicable to apply the shape: and the second diffusion portion 118 continuous diffusion layer 108, the first diffusion portion „and 乂佳=but not limited, (polycarbonate, PC), titanium oxide & ^歹1 is a combination of polycarbonates; or a combination of polymethyl methacrylate methyl vinegar - such as 6, legs), titanium oxide and oxygen cut.
' 'TW5797PA 由於連續擴散層108的面積大於第一擴散部no的 鋪設面積與第二擴散部118的鋪設面積之和，且連續擴 散層108於本實施例中係為一均勻塗佈之區域，故可導 出較多的光線’使導光棒102内離第一光源1〇4或第二 光源106較逆的光線出光強度較強。如此，導光棒1〇2 在各個位置的出光強度係較均勻。 第一擴政部110及第一擴散部118的形成方式具有 多種形式，以下係以第一擴散部11〇為例詳細說明之。 φ 就第一擴散部110的分佈密度而言，請參照第2圖， 其繪示第1圖中往方向VI觀看到之導光棒的上視圖。第 擴散部110從第一端114至連續擴散層1〇8的分佈密 f係漸增或漸減。本實施例中，第一擴散部11〇從第一 端114至連續擴散層1〇8的分佈密度係以漸增為例作說 第 S1 擴 中'TW5797PA, since the area of the continuous diffusion layer 108 is larger than the sum of the laying area of the first diffusion part no and the laying area of the second diffusion part 118, and the continuous diffusion layer 108 is a uniformly coated area in this embodiment, Therefore, more light can be derived, so that the light intensity of the light in the light guide bar 102 that is opposite to the first light source 1〇4 or the second light source 106 is stronger. Thus, the light guiding intensity of the light guiding rod 1〇2 at each position is relatively uniform. The manner in which the first expansion unit 110 and the first diffusion unit 118 are formed has various forms. Hereinafter, the first diffusion unit 11A will be described in detail as an example. φ For the distribution density of the first diffusion portion 110, refer to Fig. 2, which is a top view of the light guiding rod viewed in the direction VI in Fig. 1. The distribution of the first diffusion portion 110 from the first end 114 to the continuous diffusion layer 1〇8 is gradually increased or decreased. In this embodiment, the distribution density of the first diffusion portion 11〇 from the first end 114 to the continuous diffusion layer 1〇8 is increased by taking an example of the S1 expansion.
就第一擴散部110的排列形式而言，如第2圖所示 一擴散部110可排列成數條大致上互呈水平的直線 。然此非用以限制本發明，在另一實施態樣中，第一 散=110村排列成波浪狀；或者，在其它實施態樣 ，第一擴散部110可隨機排列。 就第一擴散部110的外形而言，每個第 是圓形、多邊形或刪。然此非用二 =月’第-擴散部11G亦可以是對導光棒1Q2進行$ / (sand blasting)處理後的外形。 大11()的大小而言’第一擴散部m白 ρβ,/ 端U4至連續擴散層丨08漸大。然此非用 限制本發明擴散部⑽大小端丨14 = 201137267 1 WD/y/tw 續擴散層108亦可漸小；或者，第一擴散部u〇的大小 亦可隨機配置。此外’第-擴散部m亦可為數個分離 的擴散結構，該些擴散結構可透過一透明光學黏膠έ士人 於導光棒102。 ^ " σ 綜上所述，第一擴散部U0的分佈密度、排列形式、 外形及大小具有多種實施態樣，實際設計可依實務上對 光源模組100的設計需求而定，本實施例在此並不作任 何限制。 第二擴散部118的分佈密度、排列形式、外形及大 小相似於上述所揭露之第一擴散部11〇的分佈密度、排 列形式及外形’在此不再重複贅述。 义 第二實施例 請參照第3圖，其緣示依照本發明第二實施例之光 源模組的前。第二實施射與第—實施例相同之處 ，用相同標號，在此不再贅述。第二實施例與第一實施 ^不同之處在於’第二實施例之光源模組之導光棒 202的端面具有相交之二斜面。 進-步地說，導光棒2〇2的第一端的端面具有相: 斜面220與第二斜面222,第一斜面22〇與第二 =2的連接處228為一突出尖端並朝向第一光源刚 Ί 202的第二端的端面具有相交之第三斜面224襄 πΓΠ226 ’第三斜面224與第四斜面226的連接處 為一突出尖端並朝向第二光源丨〇6。 aa Γ第々端的第一斜面220及第二斜面222為例作1 於第斜面220及第二斜面222的傾斜角度，伯 201137267 'lW57y7FA ^ = ^進人導光棒202的光線LI往導光棒2G2的中心 被拆道如此可避免光線U在進入導光棒202後隨即 導光棒2G2外。藉此，可增加光線L1在導光棒 路控長度’使光線U有更多機會接觸到連 θ 1G8、第—擴散部11G或第二擴散部118,以均 勻地出光。 此外，第—端的第三斜面224與第四斜面226的作As for the arrangement of the first diffusion portions 110, as shown in Fig. 2, a diffusion portion 110 may be arranged in a plurality of straight lines which are substantially horizontal to each other. However, this is not intended to limit the present invention. In another embodiment, the first dispersion = 1010 is arranged in a wave shape; or, in other embodiments, the first diffusion portions 110 may be randomly arranged. As far as the outer shape of the first diffusing portion 110 is concerned, each is circular, polygonal or deleted. However, the non-use two-month's first-diffusion portion 11G may be a shape obtained by performing a $/(sand blasting) treatment on the light guide bar 1Q2. In terms of the size of the large 11 (), the first diffusion portion m ρβ, / the end U4 to the continuous diffusion layer 丨 08 is gradually enlarged. However, the size of the diffusion portion (10) of the present invention is limited to 14: 201137267 1 WD/y/tw. The diffusion layer 108 may also be gradually smaller; or the size of the first diffusion portion u〇 may be randomly arranged. Further, the 'first-diffusion portion m' may be a plurality of separate diffusion structures which are transparent to a light-transmitting rod 102 through a transparent optical adhesive. ^ " σ In summary, the distribution density, arrangement form, shape and size of the first diffusion portion U0 have various implementations, and the actual design can be determined according to the design requirements of the light source module 100. There are no restrictions here. The distribution density, the arrangement form, the outer shape and the size of the second diffusion portion 118 are similar to those of the first diffusion portion 11A disclosed above, and the arrangement density and arrangement form are not repeated herein. Second Embodiment Referring to Figure 3, there is shown a front view of a light source module in accordance with a second embodiment of the present invention. The second embodiment is the same as the first embodiment, and the same reference numerals will be omitted. The second embodiment is different from the first embodiment in that the end faces of the light guiding rods 202 of the light source module of the second embodiment have intersecting slopes. Further, the end surface of the first end of the light guiding rod 2〇2 has a phase: a slope 220 and a second slope 222, and the joint 228 of the first slope 22〇 and the second=2 is a protruding tip and faces the first The end face of the second end of a light source 202 has an intersecting third slope 224 襄 π 226 226. The junction of the third slope 224 and the fourth slope 226 is a protruding tip and faces the second source 丨〇 6. The first inclined surface 220 and the second inclined surface 222 of the first end of the aa 为 are taken as an inclination angle of the first inclined surface 220 and the second inclined surface 222, and the light rays LI entering the light guiding rod 202 are guided to the light. The center of the rod 2G2 is removed so that the light U is prevented from entering the light guiding rod 202 and then outside the light guiding rod 2G2. Thereby, it is possible to increase the light beam L1 at the light guide bar control length' so that the light U has more chance to contact the continuous θ 1G8, the first diffusion portion 11G or the second diffusion portion 118 to uniformly emit light. In addition, the third inclined surface 224 and the fourth inclined surface 226 of the first end
目似於第一端的第一斜面220及第二斜面222,在此不 再重複贅述。 雖然本實施例中導光棒的第___端及第二端分別以斜 面為例=說明’然、於其它實施態樣中，導祕的第一端 ^第二端中至少一者亦可為突出端朝向光源的弧面，其 造成的效果相似於上述之第一斜面22〇及第二斜面222 所產生的效果’在此不再重複贅述。 第三實施例 請參照第4圖，其繪示依照本發明第三實施例之光 源模組的前視圖。第三實施例中與第一實施例相同之處 沿用相同標號，在此不再贅述。第三實施例與第一實施 例不同之處在於，第三實施例之光源模組3〇〇更包括一 反射層332。 反射層332可為一反射片，其整個貼附或塗佈於導 光棒302上並覆蓋連續擴散層i〇8、第一擴散部11〇、第 二擴散部118,以及覆蓋連續擴散層1〇8、第一擴散部11〇 與第二擴散部118彼此之間的部份。然此非用以限制本 發明，在一實施態樣中，反射層332亦可僅覆蓋連續擴 201137267 i w^/v/m • j $層108、第一擴散部11〇及第二擴散部118而不覆蓋連 縯擴散層108、第一擴散部丨1〇與第二擴散部118彼此之 間的部份。 較佳地但非限定地，反射層332可為鏡反射層，使 牙過連縯擴散層108、第一擴散部及第二擴散部118 的漏光L3被反射回導光棒3〇2内，如此可增加光線u 及L2在導光棒202内的行經路徑長度，使光線u及L2 有更多的機會接觸到連續擴散層1〇8、第一擴散部11〇或 秦，一擴散部118 ’然後均勻地出光。 第四實施例 請參照第5圖，其繪示依照本發明第四實施例之光 源模組應用於檯燈的示意圖。第四實施例中與第一實施 例相同之處沿用相同標號，在此不再贅述。^四實施例 與第一實施例不同之處在於，第四實施例之光源模組4〇〇 更包括燈罩434及反射層440。 燈罩434容置光源模組4〇〇之導光棒1〇2、第一光 源404、第二光源406設置。燈罩434具有第一開孔436 及第二開孔438 ’被導出導光棒1〇2之光線L4可自第一 開孔436出光。第二開孔438露出連續擴散層1〇8、第一 擴散部110與第二擴散部118中至少一部份，藉以散逸 導光棒102所產生的熱量。 反射層440设於燈罩434之内表面，用以將漏出導 光棒102的光線反射回導光棒1〇2内。 雖然本實施例之燈罩434以具有第二開孔438為例 作說明’然於一實施態樣（未繪示）中，燈罩434亦可 201137267The first inclined surface 220 and the second inclined surface 222 which are similar to the first end are not repeated here. In the embodiment, the ___ end and the second end of the light guiding rod are respectively slanted as an example. Illustratively, in other embodiments, at least one of the first end and the second end of the guiding stalk is also The arcuate surface of the protruding end facing the light source may be similar to the effect of the first inclined surface 22〇 and the second inclined surface 222 described above, and the description thereof will not be repeated here. THIRD EMBODIMENT Referring to Figure 4, there is shown a front view of a light source module in accordance with a third embodiment of the present invention. The same reference numerals are used in the third embodiment, which are the same as those in the first embodiment, and will not be described again. The third embodiment is different from the first embodiment in that the light source module 3 of the third embodiment further includes a reflective layer 332. The reflective layer 332 may be a reflective sheet that is entirely attached or coated on the light guiding rod 302 and covers the continuous diffusion layer i 8 , the first diffusion portion 11 , the second diffusion portion 118 , and the continuous diffusion layer 1 . 〇8, a portion between the first diffusion portion 11A and the second diffusion portion 118. Therefore, the present invention is not limited to the present invention. In an embodiment, the reflective layer 332 may cover only the continuous extension 201137267 iw^/v/m • j $ layer 108, the first diffusion portion 11〇, and the second diffusion portion 118. The portion of the diffusion layer 108, the first diffusion portion 丨1〇, and the second diffusion portion 118 are not covered. Preferably, but not limited to, the reflective layer 332 can be a mirror reflective layer, so that the light leakage L3 of the tooth diffusion layer 108, the first diffusion portion and the second diffusion portion 118 is reflected back into the light guide rod 3〇2. Thus, the length of the path of the light rays u and L2 in the light guiding rod 202 can be increased, so that the light rays u and L2 have more chance to contact the continuous diffusion layer 1〇8, the first diffusion portion 11〇 or the Qin, and the diffusion portion 118. 'Then then light out evenly. Fourth Embodiment Referring to Figure 5, there is shown a schematic view of a light source module applied to a desk lamp in accordance with a fourth embodiment of the present invention. The same reference numerals are used in the fourth embodiment in the same manner as the first embodiment, and details are not described herein again. The fourth embodiment is different from the first embodiment in that the light source module 4A of the fourth embodiment further includes a lamp cover 434 and a reflective layer 440. The light cover 434 houses the light guide bar 1 〇 2 of the light source module 4, and the first light source 404 and the second light source 406 are disposed. The light shield 434 having the first opening 436 and the second opening 438' can be led out from the first opening 436 by the light L4 which is led out of the light guiding rod 1〇2. The second opening 438 exposes at least a portion of the continuous diffusion layer 1〇8, the first diffusion portion 110 and the second diffusion portion 118, thereby dissipating heat generated by the light guiding rod 102. The reflective layer 440 is disposed on the inner surface of the lamp cover 434 for reflecting the light leaking out of the light guide bar 102 back into the light guide bar 1〇2. Although the lampshade 434 of the present embodiment has the second opening 438 as an example, the lampshade 434 can also be used in an embodiment (not shown).
• · TW5797PA 省略第二開孔438。 本實施例的光源模組400可應用於照明設備，例如 是檯燈、路燈或其它種類的照明產品。以檯燈為例說明， 光源模組400可設於一燈架442上，燈架442與光源模 組400組合成為檯燈。 綜合上述實施例，本發明之光源模組具有多種用 途，可作為背光模組的光源、照明設備的光源或其它需 要光源的產品。 本發明上述實施例所揭露之光源模組，其透過導光 ® 棒中連續擴散層及彼此分離的擴散部的設計，使進入到 導光棒的光線更均勻地出光。 綜上所述，雖然本發明已以較佳實施例揭露如上， 然其並非用以限定本發明。本發明所屬技術領域中具有 通常知識者，在不脫離本發明之精神和範圍内，當可作 各種之更動與潤飾。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】 第1圖繪示依照本發明第一實施例之光源模組的示 意圖。 第2圖繪示第1圖中往方向VI觀看到之導光棒的上 視圖。 第3圖繪示依照本發明第二實施例之光源模組的前 視圖。 第4圖繪示依照本發明第三實施例之光源模組的前 視圖。 [s 11 201137267 iw)/y/m * 第5圖繪示依照本發明第四實施例之光源模組應用 於檯燈的示意圖。 【主要元件符號說明】 100、200、300、400 :光源模組 102、202、302 :導光棒 104、404 :第一光源 106、406 :第二光源 108 :連續擴散層 110 :第一擴散部 112 :周緣面 114 :第一端 116 :第二端 118 :第二擴散部 220 :第一斜面 222 :第二斜面 224 :第三斜面 226 :第四斜面 228、230 :連接處 332、440 :反射層 434 :燈罩 436 :第一開孔 438 :第二開孔 442 :燈架 LI、L2 ' L4 :光線 L3 :漏光 VI :方向• The TW5797PA omits the second opening 438. The light source module 400 of the present embodiment can be applied to a lighting device such as a desk lamp, a street lamp or other kinds of lighting products. Taking the desk lamp as an example, the light source module 400 can be disposed on a light fixture 442, and the light fixture 442 is combined with the light source module 400 to form a desk lamp. In combination with the above embodiments, the light source module of the present invention has various uses, and can be used as a light source of a backlight module, a light source of a lighting device, or other products requiring a light source. The light source module disclosed in the above embodiments of the present invention transmits the light entering the light guiding rod more uniformly through the design of the continuous diffusion layer and the diffusing portions separated from each other in the light guiding rod. In conclusion, the present invention has been disclosed in the above preferred embodiments, and is not intended to limit the invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a light source module according to a first embodiment of the present invention. Fig. 2 is a top view of the light guiding rod viewed in the direction VI in Fig. 1. Figure 3 is a front elevational view of a light source module in accordance with a second embodiment of the present invention. Fig. 4 is a front elevational view of a light source module in accordance with a third embodiment of the present invention. [s 11 201137267 iw)/y/m * FIG. 5 is a schematic view showing the application of the light source module to the desk lamp in accordance with the fourth embodiment of the present invention. [Main component symbol description] 100, 200, 300, 400: light source module 102, 202, 302: light guide bar 104, 404: first light source 106, 406: second light source 108: continuous diffusion layer 110: first diffusion Portion 112: peripheral surface 114: first end 116: second end 118: second diffusing portion 220: first inclined surface 222: second inclined surface 224: third inclined surface 226: fourth inclined surface 228, 230: connection 332, 440 Reflective layer 434: lampshade 436: first opening 438: second opening 442: lamp holder LI, L2 'L4: light L3: light leakage VI: direction