M343814 八、新型說明： 【新型所屬之技術領域】 本創作係關於一種背光模組，特別是關於一種用於發光鍵般 的背光模組。 1 【先前技術】 i到資訊產品的主要輪入方式不外乎鍵盤、滑鼠或是觸控 ，，而發展最為久遠的就是鍵盤。談到鍵盤，雖然不是新奇的產 口口 ’但疋部跟使用者息息相關，因為要方便地輸入文字，還是得 ，過鍵盤、，觸控方式輸入還是不夠直覺及便利。鍵盤的手感一直 ，鍵盤產業的發展重點，但是近年來為了讓使用者能有新奇的 觀感」，光鍵盤也越來越受到注目。當然，發光鍵盤還有另一個 場Ϊ時，透過按鍵周圍的散發的光線或者 用者使用ίί曰士、ί、ΐ:能讓使用者清晰地辨識不同按鍵。讓使 快速且方便鱗嶋條件，幽發光鍵盤 小型iii化的光，、反光片及光源’於 勻地傳播至整片導光板。於導光板内產生全反射而能均 會從導光板之相對按鍵的附於導光板之—面，讓光線不 發光鍵盤之主要目的就是反光片所貼附的該側面）出光。 光的位置能騰對應於處能有光線射出’因此為了讓出 結構可改變光線的行進方向，’而在導光板上形成反光結構。反光 導光板之相對反光結構的二丄致使光線不容易產生全反射，進而 可透過印刷、雷射、喑累+、 —面可射出光線。其中，該導光板上 構。 4v形切割等加工方式形成多個反光結 5 M343814 、㈣之主要範脅在於提供—種能狗快速且簡便地製 造的發光鍵盤，用以解決上述問題。 ^ 【新型内容】 本創作之-齡在於提供—種背光餘，透雜壓方式结合 板j反光片，進而降低組裝複、降低生產成本以及增加 生產效率。 一根據一具體實施例，本創作之背光模組包含一導光板、一反 光片以及至4-發光二極體。導光板包含一表面及一凹陷空間， 該表面上職有至少-反光結構。該反光#密貼於該導光板之該 表面。该至少一發光二極體位於該反光片上，並設置於該導光板 ^亥凹陷空間内。射，該反光片係透過一熱壓方式與該導光板 密貼，同時該導光板之該反光結構係由該熱壓方式所形成。 於此實施例中，該反光結構係一 V形凹槽(v-cut)。一電路形 成於该反光片上，該電路與該發光二極體電性連接。該發光二極 體係一單色發光二極體或一多色發光二極體。 本創作之另一範疇在於提供一種發光鍵盤，透過熱壓方式結 合背光模組之導光板及反光片，進而降低組裝複雜度、降低生產 成本以及增加生產效率。 根據一具體實施例，本創作之發光鍵盤包含一鍵帽、一透光 底板、一架體及一背光模組。該透光底板位於鍵帽之下並包含至 少一透光部。該架體銜接該鍵帽及該透光底板，使得該鍵帽可相 對該透光底板垂直移動。該背光模組位於該透光底板之下，結構 6 M343814 已於上述說明描述過，於此不再贅述。 光模組之該反光片透過該熱壓方式與該導光板密貼的同 時，該導光板也透過該熱壓方式密貼於該透光底板。或者，該背 光杈組之該導光板先透過另一熱壓方式密貼於該透光底板，該反 光片接者再透過該熱壓方式與該導光板密貼。 一此外，.該透光底板之材質係金屬或塑膠。該透光底板之該透 光部對應該導光板之該反光結構，或者該透光部對應該背光模组 之該發光二極體。 、 絲上所述，本創作之背光模組透過熱壓方式結合導光板及反 導光板上的反光結構。甚至’本創作之發光鍵盤 I透3舰方式-次結合透光底板、導光板及反光片，因此可快 ΐΐΞίϊ製造本創作之發光鍵盤及其背光模組，以及導光板上 的構。本創作無須在料板上先形成反光結構，也益需進 導iif後續黏貼流程’甚至也不需進肅模組與 因此降低了喊赫度、增加生產效率並 式得點與精神可以藉由以下的創作詳述及所關 【實施方式】 360 圖二。圖會示本創作之反光片淑、導光板 360及透先底板34 一起埶壓姓 守尤极 光鍵盤3之干音图同、、至、、、° 口之不思圖。圖二繪示本創作之發 3〇 ^ ^ 3- 7 M343814 鍵盤3。 如圖二所示，透光底板34位於鍵帽30之下並包含至少一透 光部340。架體32銜接於鍵帽3〇及透光底板34，使得鍵帽30 可相對透光底板34垂直移動。背光模組36位於透光底板34之 下’用以提供發光鍵盤3 —背光。實際上，本創作之發光鍵盤3 還可包含一彈性體(未繪示），位於鍵帽30與透光底板34之間， 用以提供鍵帽30 —彈性回復力。當鍵帽30被壓下時，可藉由該 彈性體回復到原始高度。 φ 如圖一及圖一所示，本創作之背光模組36包含導光板360、 反光片362及發光二極體364。導光板36〇包含下表面36〇〇及凹 陷空間3602，反光片362密貼於導光板36〇之下表面％⑻。本 創作透過具有一定溫度(如圖一所示，溫度約超過攝氏100度)的 公模40加熱反光片362及導光板360，同時透過公模40及母模 42將反光片362與導光板36〇緊壓在一起。由於反光片362及導 $板360受熱會軟化，因此軟化後的反光片遍及導光板36〇受 壓而擠在一起時，兩者之間可彼此結合而不需透過額外的鎖合或 黏合。此外，為了進一步節省生產成本及組裝複雜度，還可先透 ⑩過印刷或塗布方式將電性連接於發光二極體364的電路360形成 於反光片362上，接著才進行熱壓程序。 圖二中的導光板360之反光結構36〇4透過圖一中的公模4〇 的犬起、$口才冓400熱壓而形成。如圖一所示，公模之突起社 4士00為突起圓狀物。當公模4〇熱壓反光片3纪以貼合導光板$6〇 守反光片360會被加熱軟化並對應地變形以容納公模仙 =吉構4〇〇。同時，公模4〇的熱量也影響到導光板36〇，因而導 =360也被加熱軟化，並對應地變形以容納反光 ί分因= 卜模4由21透4底板34具有聽部如以銜接於= 來，公模4G與賴42上下她進行熱壓合時，才不會損ΞΪ光 8 M343814 底板34的突起部342。 八一及圖二所示’導光板36之下表面3600往内凹陷-部 =形，陷空間雇。凹陷的程度可小於或等於導光板36之 ’凹陷娜通為—盲孔或一通孔。發光二極體364 mUfi 362上，並設置於凹陷空間3602内。發光二極體364 IflUf ’以達剩向發光的目的，進而發光二極體364所發 可於導光板36内傳遞行進。其中，發光二極體辦係 早色赉光一極體或一多色發光二極體。 1^^圖二所不，反光片362及導光板360的變形部份為多個凹 36〇4)，傳遞於導光板360内的光線L1可被形成 板360上的凹陷圓（反光結構36〇4)改變了行進路線。繼 ，^於光線L1被改變行進路線，因此光線〇於上表面36〇6 拖Π小於全反射角的可能性增加，亦即，光線L1有較大的 34 射出上表面通。接著，光線U就可穿過透光底板 34的透光部340而照亮鍵帽3〇。 需補充說明的是，反光結構細的設計不限於圖二所示之 Ξϊ凹陷_ ’也可為v形凹槽(V，結構，端視背光模組36 發光效果及發光效率而定。此外，由於反光結構3604的 :木數目越多(越多凹關聚集在一起)或是尺寸越大(凹陷圓的半 =越大>，則越多光線會被改變行進方向而射出導光板％。因 =，反光結構3604與發光二極體364的距離以及反光結構36〇4 忠尺寸皆會，響發光效果。舉例而言，若要發光鍵盤3均勻地發 二’也就是每健_亮度盡量—致，賴接近發光二極體364 ^鍵帽3〇下的反絲構3_之數目需較少，献反光 的尺寸需較小。 如圖一及圖二所示，反光片362密貼於導光板36〇之下表面 — Ο，因此發光二極體Μ*所發射的光線勢必不會由下表面3_ 9 M343814 牙射透出’光線只可能從上表面3606穿射透出。因此，形成於 導光板360的反光結構3604搭配熱壓於導光板36的反光片 36^’可讓於導光板360内傳遞行進的光線依據設計從正確的位 置牙透射出，瓖背光模組36能依照設計目的及需求提供最佳化 的月光。需補充說明的是，由於反光片362與導光板360之間的 結合係透過熱壓方式，因此反光片362也密貼於導光板36之反 光結構3604。M343814 VIII. New Description: [New Technology Field] This creation is about a backlight module, especially for a backlight module for lighting keys. 1 [Prior Art] The main way to enter information products is keyboard, mouse or touch, and the longest development is the keyboard. When it comes to the keyboard, it is not a novel mouthpiece. But the crotch is closely related to the user. Because it is convenient to input text, it is still necessary to pass the keyboard, and the touch input is not intuitive enough and convenient. The feel of the keyboard has always been the focus of the development of the keyboard industry, but in recent years, in order to allow users to have a novel look, the optical keyboard has also attracted more and more attention. Of course, when there is another field in the illuminated keyboard, the light emitted around the button or the user can use ίί gentleman, ί, ΐ: to allow the user to clearly recognize the different buttons. The light, the retroreflective sheeting and the light source of the small illuminating keyboard are spread to the entire light guide plate in a fast and convenient manner. The total reflection in the light guide plate can be emitted from the opposite side of the light guide plate attached to the light guide plate, so that the main purpose of the light not emitting the keyboard is to illuminate the side to which the reflector is attached. The position of the light can correspond to the position where the light can be emitted, so that the structure can change the direction of travel of the light, and a reflective structure is formed on the light guide plate. The two opposite reflection structures of the reflective light guide plate make it difficult for the light to be totally reflected, and the light can be emitted through the printing, the laser, the smashing +, and the surface. Wherein, the light guide plate structure. 4v-shaped cutting and other processing methods form a plurality of reflective junctions. 5 M343814, (4) The main threat is to provide an illuminated keyboard that can be quickly and easily manufactured by a dog to solve the above problems. ^ [New Content] The age of this creation is to provide a kind of backlight, and the combination of the pressure and the pressure method to reduce the assembly cost, reduce the production cost and increase the production efficiency. According to a specific embodiment, the backlight module of the present invention comprises a light guide plate, a light reflecting plate and a 4-light emitting diode. The light guide plate comprises a surface and a recessed space, the surface having at least a reflective structure. The reflective light is adhered to the surface of the light guide plate. The at least one light emitting diode is disposed on the reflective sheet and disposed in the recessed space of the light guide plate. The reflective sheet is adhered to the light guide plate by a heat pressing method, and the reflective structure of the light guide plate is formed by the hot pressing method. In this embodiment, the reflective structure is a V-cut. A circuit is formed on the retroreflective sheeting, and the circuit is electrically connected to the light emitting diode. The light-emitting diode system is a monochromatic light-emitting diode or a multi-color light-emitting diode. Another aspect of the present invention is to provide an illuminated keyboard that combines the light guide plate and the reflective sheet of the backlight module by heat pressing, thereby reducing assembly complexity, reducing production cost, and increasing production efficiency. According to a specific embodiment, the illuminated keyboard of the present invention comprises a keycap, a transparent bottom plate, a frame and a backlight module. The light transmissive bottom plate is located below the keycap and includes at least one light transmitting portion. The frame engages the keycap and the light transmissive bottom plate such that the key cap can move vertically relative to the transparent bottom plate. The backlight module is located under the transparent substrate, and the structure 6 M343814 has been described in the above description, and details are not described herein. The light reflecting plate of the optical module is adhered to the light guiding plate by the hot pressing method, and the light guiding plate is also adhered to the transparent substrate through the hot pressing method. Alternatively, the light guide plate of the backlight unit is first adhered to the transparent substrate through another heat pressing method, and the reflector is further adhered to the light guide plate by the hot pressing method. In addition, the material of the transparent bottom plate is metal or plastic. The light transmissive portion of the light-transmitting substrate corresponds to the light-reflecting structure of the light guide plate, or the light-transmitting portion corresponds to the light-emitting diode of the backlight module. As described above, the backlight module of the present invention combines the light-reflecting structure on the light guide plate and the anti-light guide plate by means of hot pressing. Even the illuminating keyboard I of this creation, through the three-ship method - combined with the transparent substrate, the light guide plate and the reflective sheet, can quickly manufacture the illuminated keyboard and its backlight module, as well as the structure of the light guide plate. This creation does not need to form a reflective structure on the material board, and it is also necessary to introduce the iif follow-up process. It does not even need to enter the module, thus reducing the shouting, increasing the production efficiency and the point and spirit can be achieved. The following details of the creation and related [implementation] 360 Figure 2. The picture shows that the reflective sheet of the creation, the light guide plate 360 and the transparent bottom plate 34 together suppress the dry sound of the surname, the singularity of the keyboard, the sound of the same, the to, the, and the mouth. Figure 2 shows the creation of this creation 3〇 ^ ^ 3- 7 M343814 keyboard 3. As shown in FIG. 2, the light transmissive bottom plate 34 is located below the keycap 30 and includes at least one light transmissive portion 340. The frame body 32 is coupled to the keycap 3〇 and the transparent bottom plate 34 such that the keycap 30 can move vertically relative to the transparent bottom plate 34. The backlight module 36 is located below the transparent substrate 34 to provide a backlight for the illuminated keyboard 3. In fact, the illuminated keyboard 3 of the present invention may further comprise an elastic body (not shown) between the keycap 30 and the transparent bottom plate 34 for providing the keycap 30 - elastic restoring force. When the keycap 30 is depressed, it can be returned to the original height by the elastic body. As shown in FIG. 1 and FIG. 1 , the backlight module 36 of the present invention comprises a light guide plate 360, a reflective sheet 362 and a light-emitting diode 364. The light guide plate 36 includes a lower surface 36 and a recessed space 3602, and the retroreflective sheet 362 is adhered to the lower surface of the light guide plate 36 (8). The present invention heats the retroreflective sheeting 362 and the light guide plate 360 through a male mold 40 having a certain temperature (the temperature is about 100 degrees Celsius as shown in FIG. 1), and simultaneously passes the retroreflective sheet 362 and the light guide plate 36 through the male mold 40 and the female mold 42. 〇 pressed together. Since the retroreflective sheeting 362 and the guide sheet 360 are softened by heat, the softened retroreflective sheeting can be bonded to each other when the light-guiding sheet 36 is pressed and squeezed together without additional locking or bonding. In addition, in order to further save production cost and assembly complexity, the circuit 360 electrically connected to the light-emitting diode 364 may be formed on the retroreflective sheet 362 by printing or coating, and then the hot pressing process is performed. The light-reflecting structure 36〇4 of the light guide plate 360 in Fig. 2 is formed by the hot pressing of the male mold 4 and the oral cavity 400 of Fig. 1. As shown in Figure 1, the male model of the male model is a rounded object. When the male mold 4〇 hot-pressed reflective sheet 3 is attached to the light guide plate $6〇, the reflective sheet 360 is heated and softened and deformed correspondingly to accommodate the male mold. At the same time, the heat of the male mold 4〇 also affects the light guide plate 36〇, so the guide=360 is also heated and softened, and is correspondingly deformed to accommodate the reflection ί分因= The die 4 is 21 through the bottom plate 34 has the listening portion as When the male mold 4G and the Lai 42 are hot-pressed, the protrusion 342 of the 8 M343814 bottom plate 34 is not damaged. As shown in Fig. 1 and Fig. 2, the lower surface 3600 of the light guide plate 36 is recessed inwardly-shaped and shaped. The degree of the depression may be less than or equal to the recessed light of the light guide plate 36 being a blind hole or a through hole. The light-emitting diode 364 is disposed on the mUfi 362 and disposed in the recessed space 3602. The light-emitting diode 364 IflUf' is used for the purpose of emitting light, and the light-emitting diode 364 is transmitted through the light guide plate 36. Among them, the light-emitting diode system is an early-color dimming body or a multi-color light-emitting diode. 1^^Fig. 2, the deformed portion of the reflective sheet 362 and the light guide plate 360 is a plurality of recesses 36〇4), and the light L1 transmitted through the light guide plate 360 can be formed into a concave circle on the plate 360 (reflective structure 36) 〇 4) Changed the route of travel. Then, the light L1 is changed in the traveling path, so that the probability that the light is on the upper surface 36〇6 and the drag is less than the total reflection angle increases, that is, the light L1 has a larger 34 to be emitted from the upper surface. Then, the light U can pass through the light transmitting portion 340 of the light transmitting substrate 34 to illuminate the keycap 3'. It should be added that the thin design of the reflective structure is not limited to the depression shown in FIG. 2 ' can also be a v-shaped groove (V, structure, depending on the illumination effect and luminous efficiency of the backlight module 36. Due to the reflective structure 3604: the greater the number of woods (the more the recesses are gathered together) or the larger the size (half the larger = smaller of the concave circle), the more light is changed by the direction of travel and the % of the light guide plate is emitted. Because of the distance between the reflective structure 3604 and the light-emitting diode 364 and the reflective structure 36〇4, the size of the light-emitting structure is good, and the light-emitting effect is sounded. For example, if the light-emitting keyboard 3 is to be uniformly emitted two times, that is, every health_brightness is as far as possible.至,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, The light emitted from the lower surface of the light guide plate 36 is Ο, so the light emitted by the light-emitting diode Μ* is not likely to be emitted by the lower surface 3_9 M343814. The light can only pass through the upper surface 3606. Therefore, The reflective structure 3604 formed on the light guide plate 360 is combined with the retroreflective sheet 36^ which is heat-pressed on the light guide plate 36. 'The light that can be transmitted through the light guide plate 360 can be transmitted from the correct position according to the design. The backlight module 36 can provide an optimized moonlight according to the design purpose and needs. It should be added that, due to the reflective sheet 362 The bonding between the light guide plate 360 and the light guide plate 360 is transmitted through the heat pressing method, so that the retroreflective sheet 362 is also adhered to the light reflecting structure 3604 of the light guide plate 36.
由圖一、圖一以及上述說明可知，本創作的發光鍵盤 熱壓方式將反光片迎、導光板遍及透光底板3；^：在L = 亚且同時形成導光板360上的反光結構3604。因此，本創作之發 光鍵盤3可快速且簡便地組裝而成。 、除了上述的單次熱壓方式之外，本創作也可透過兩階段的熱 壓方式製成發光鍵盤3。請參關三A及圖三B。圖三A纟會示^ 作之導光板360與透光底板34 —起熱壓結合之示意圖。圖三b 繪=本創作之反光片362與已結合的導光板36〇 一起熱壓結合之 示意圖。、首先，如圖三Α所示，透過具有平坦表面的;^模'口5〇口以 熱壓方式將導光板360密貼於透光底板％ ;接著，如圖三B 示透過具有犬起結構4〇〇的另一公模4〇以孰壓方式將 結合的導光板湖。圖-緣示了單二 二然、而，圖二A及圖三B繪示了兩階段的熱壓方 ^可較為確貫地進行壓合及製作_二中的反光結構細。同 階段的熱壓方式後，就可進行組裝架體32及鍵帽 30，、、且哀元成後如同圖二所示的發光鍵盤3。 過，透光底板34需要讓背光模組36所提供的背光通 可、’巾目30本身或周圍，因此透光底板34之透光部34〇 光底板34之材質為金屬’則透光部34G為-通。 34之材質為塑膠，則透光部由光線可穿透的材料==絲 M343814 般而δ，透光底板34之透光部340對應於導光板36〇之反光結 構腦。實際上，透光部也可對應背光模組之發光二極體备 的，此時的發光二極體就不是侧向擺設於導光板内，❿是垂直^ 言，於導光板内。垂直擺設的發光二極體可直接朝透光部發射光 線，具有此配置的發光鍵盤的局部亮度較高，而侧向配置發光二 極體364的發光鍵盤3的整體發光亮度較為均勻。 先板上的反光結構。本創作盔堵/道上』1 ^ 以及寺 無需進行反光片導先板上先形成反光結構，也 极組與透光底板的組裝流程，因 而進订月先 效率並降低生產成本。 牛低了組叙複雜度、增加生產 創作例之詳述’係希望能更加清楚描述本 本創作之範“加以PF岳f亚3上述所揭露的較佳具體實施例來對 l· /、相等性的安排於本創作所欲申1主蚩jf/f庇*泊1各種改變 此，本創作所申申㈣之專利範圍的範脅内。因 廣的解釋，以致㈣應該根據上述的說明作最寬 致使其‘盍所有可朗改變以及具相等性的安排。 11 M343814 【圖式簡單說明】 圖一繪示本創作之反光片、導光板及透光底板一起熱壓結合 之示意圖。 圖二繪示本創作之發光鍵盤之示意圖。 圖三A繪示本創作之導光板與透光底板一起熱壓結合之示意 * 圖。 _ 圖三B繪示本創作之反光片與已結合的導光板一起熱壓結合 之示意圖。 【主要元件符號說明】 3 :發光鍵盤 30 :鍵帽 32 :架體 34 ·透光底板 36 :背光模組 340 :透光部 342 :突出部 360 ··導光板 3600 :下表面 3602 ·•凹陷空間 3604 :反光結構 3606 ·上表面 362 :反光片 364 :發光二極體 366 =電路 40、50 :公模 4〇〇 :突出結構 42 :母模 420 :凹陷部 L1 ·光線 12As shown in FIG. 1 and FIG. 1 and the above description, the illuminated keyboard of the present invention has a reflective film covering the light guide plate and the light guide plate over the transparent substrate 3; ^: at L = sub- and simultaneously forming the reflective structure 3604 on the light guide plate 360. Therefore, the illuminating keyboard 3 of the present invention can be assembled quickly and easily. In addition to the single hot pressing method described above, the creation can also be made into a luminous keyboard 3 through two-stage hot pressing. Please refer to Section 3A and Figure 3B. FIG. 3A is a schematic diagram showing the combination of the light guide plate 360 and the transparent substrate 34. Fig. 3b is a schematic view showing the combination of the retroreflective sheeting 362 of the present invention and the combined light guiding plate 36A. First, as shown in FIG. 3A, the light guide plate 360 is adhered to the transparent substrate by heat-pressing through a port having a flat surface; then, as shown in FIG. Another male mold 4 of the structure 4 turns the combined light guide plate lake in a rolling manner. The figure-edge shows a single two-two, and Figure 2A and Figure 3B show that the two-stage hot pressing method can be more consistently pressed and produced in the second. After the hot pressing mode of the same stage, the frame body 32 and the keycap 30 can be assembled, and the illuminated keyboard 3 shown in Fig. 2 is formed after the sorrow. The transparent substrate 34 needs to be provided with the backlight provided by the backlight module 36, and the towel 30 itself or the surrounding area. Therefore, the light transmitting portion 34 of the transparent substrate 34 is made of metal metal. 34G is - pass. The material of 34 is plastic, and the light transmitting portion is made of light permeable material == wire M343814, and the light transmitting portion 340 of the transparent bottom plate 34 corresponds to the reflective structure of the light guide plate 36. In fact, the light transmitting portion can also be corresponding to the light emitting diode of the backlight module. At this time, the light emitting diode is not laterally disposed in the light guiding plate, and is perpendicular to the light guiding plate. The vertically disposed light emitting diode can directly emit light to the light transmitting portion, and the local brightness of the illuminated keyboard having the configuration is high, and the overall light emitting brightness of the illuminated keyboard 3 laterally disposed with the light emitting diode 364 is relatively uniform. The reflective structure on the front panel. The creation of the helmet and the road on the road 1 ^ and the temple do not need to be formed on the reflective sheet guide plate first to form a reflective structure, but also the assembly process of the pole group and the light-transmitting bottom plate, thereby making the first efficiency and reducing the production cost. The cow has reduced the complexity of the group and increased the details of the production creation. 'The hoping to more clearly describe the scope of the creation of the book'. The preferred embodiment disclosed in the above-mentioned PF Yue Fya 3 is equivalent to l· /, equality. The arrangement is intended to apply for the main 蚩jf/f * 泊 泊 各种 各种 各种 各种 各种 各种 各种 , , , , , , , , , , , 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种 各种宽 致 致 使其 使其 使其 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 The schematic diagram of the illuminated keyboard of the present invention is shown in Fig. 3. A shows the schematic diagram of the heat-compression bonding of the light guide plate of the present invention together with the transparent substrate. _ Figure 3B shows that the retroreflective sheeting of the present invention is combined with the combined light guide plate. Schematic diagram of thermocompression bonding. [Main component symbol description] 3: Illuminated keyboard 30: Key cap 32: Frame body 34 · Light-transmissive base plate 36: Backlight module 340: Light-transmitting portion 342: Projection portion 360 · Light guide plate 3600: Lower surface 3602 ·• hollow 3604: 3606-reflective structure on the surface 362: sheeting 364: a light emitting diode circuit body 366 = 40, 50: male die 4〇〇: projecting structure 42: master mold 420: recessed portion 12 Ll-ray