201202604 、發明說明： 【發明所屬之技術領域】 本發明有關於-種光學裝置，尤指-種整合微機電與 微透鏡的光發射裝置與使用其之發光二極體印表頭。〃 【先前技術】201202604, invention: [Technical Field] The present invention relates to an optical device, and more particularly to a light-emitting device incorporating a microelectromechanical and microlens and a light-emitting diode printer using the same. 〃 【Prior technology】
印表機是目前常見的電腦輸出設備，可以將電腦内儲 存的數據按照文字或圖形的方式永久的輸出到έ 明膠片上。印表機主要分為單色印表機與彩=者J 色印表機主要以黑色為主，而彩色印表機則可作為相片印擊 表機以輸出畫質精美的相片。 印表機的種類眾多，主要包括雷射引表機、噴墨印表 機與點陣式印表機等，其他還包括熱轉印式印表機(T^ermai Transfer Printer)與光感應式印表機(Cylith0graphy printer)等 。光感應式印表機是利用光轉印技術來列印影像，光轉印 技術是由一家叫做Cycolor Inc.的公司投資開發成商業化 的產品，所以這個技術也被稱做『Cyiithographytechn〇i〇gy 在光轉印技術中，會預先將顏料塗佈在特殊的相紙上 ’這些塗佈的顏料會先利用微胞囊技術（microcapsules )進 打處理，將三色顏料（青藍，洋紅和黃）先以光敏感應性 的你ill囊（light sensitive microcapsules )包起來。這些微胞 囊會對特定波長的光線產生化學反應。光感應式印表機中 的光學印表頭會以特定波長的光線掃描相紙表面，被照射 到的微胞囊會產生脆化反應。脆化的微胞囊會被光感應式 印表機中的壓力滾輪(pressure roller)壓碎而釋放出顏料以 4/14 201202604 混合出所需的色彩 這種光感應式印表機中需要設 產生狀波長的域，目前_絲=0轉印表頭以 極體(Light Emitting Diode, LED)陣列來作二可利用發光二 透鏡來傳遞紐與聚焦。⑽，目然後利用 機構過於娜’容胃造成組裝精度過低，並种子 【發明内容】 有鑑於上述問題，本發明提出—種體積小且成本低的 光發射裝置與發光二極體印表頭，可快速組裝並量產，以 解決習知光學印表頭量產不㈣問題。本發明之光發射裝 置可使用疊加方式來組裝，藉此達到提高組裝精準度並具 有簡化組裝過程的效果。 〃 本發明提供一種光發射裝置，包括一印刷電路板、一 第'一反射結構、一第·一反射結構、一透鏡陣列、至少一光 源及一上殼體。其中第一反射結構設置、第二反射結構、 透鏡陣列及光源皆設置在印刷電路板上；上殼體設置在第 一反射結構、第二反射結構及光源上。其中第一反射結構 具有第一反射面，而第二反射結構具有第二反射面。透鏡 陣列設置在第一反射面與第二反射面之間。光源設置在第 一反射面與透鏡陣列之間。上殼體具有一透光區，透光區 對應於第二反射面。 在本發明的一實施例中，上述第一反射結構用以反射 光源所發出的一光線，透鏡陣列將第一反射面所反射的光 線引導至第二反射面，第二反射面所反射的光線則經過透 光區發出。 5/14 201202604 純㈣—實施财，上述光源位於第—反射面在 / !•，反的—正投影區域；上述透光區位於第二反射面 在上冗又體的一正投影區域中。 明的—實施例中，上述第—反射面與印刷電路 質上為45度，且第一反射面與第二反射面平行 〇 、本發明又提供—種發光二極體印表頭，包括—殼體及 至少一光發射裝置。其中各該光發射I置分別包括 一印刷 電路板第一反射結構、一第二反射結構、一透鏡陣列 毛光一極體陣列及一上殼體。其中第一反射結構、第 二反射結構、透鏡陣列及發光二極體陣列皆設置在印刷電 路板上，而上殼體則設置在第一反射結構、第二反射結構 及透鏡陣列上。 其中第一反射結構具有一第一反射面，而第二反射結 構具有一第二反射面，透鏡陣列設置在第一反射面與第二 反射面之間。發光二極體陣列設置在第一反射面與透鏡陣 列之間。上殼體具有一透光區，透光區的位置對應於第二 反射面的位置。 綜合上述，本發明在印刷電路板上形成具有雙反射面 的結構，讓光源與透鏡陣列可以整合於簡單的結構上，藉 此縮小光發射裝置的所佔的空間與降低設計成本。本發明 所提出之光學系統（即光發射裝置）是利用兩個反射面改 變光程，使列印頭可以扁平(薄型)化，以利整合入行動電子 裝置，例如筆記型電腦(Notebook)、MID(M〇bile Intemet Device)手機等。 為讓本發明之上述特徵和優點能更明顯易僅，下文特 6/14 201202604 舉較佳實施例，並配合所附圖式，作詳細說明如下。 【實施方式】 (第一實施例） 請同時參照圖1與圖2 ’圖1為根據本發明第一實施例之光 發射裝置的示意圖。圖2為根據本發明第一實施例之光發射 裝置的剖面圖。光發射裝置1〇〇包括一印刷電路板110、一第 一反射結構131、一第二反射結構133、一透鏡陣列150、一光 源170及一上殼體180。第一反射結構131、第二反射結構133 、透鏡陣列150及光源170設置印刷電路板11〇上。透鏡陣列 150設置在第一反射結構131及第二反射結構133之間。光源 170設置在第一反射結構131及透鏡陣列150之間。上殼體180 設置在第一反射結構131、第二反射結構133及透鏡陣列150 上。 光源170設置在印刷電路板11 〇上，且位置在透鏡陣列 150的一側，透光區181設置在上殼體180上，且位置相 對於光源170在透鏡陣列15〇的另一側。透光區ι81的位 置對應於第二反射面134，可以讓第二反射面134所反射 的光線通過並成像於影像面19〇。第一反射面132與印刷 電路板110的夾角㊀！例如為45度，而第二反射結構133的 第二反射面134與第一反射面132互相平行。第一反射面 132面向透鏡陣列15〇的一側，而第二反射面134則面向 透鏡陣列150的另一側。光源170設置於第一反射面132 與透鏡陣列150之間，可發出光線至第一反射面132。在 本貫施例中，光源Π〇位於第一反射面132在印刷電路板 no的一正投影區域中’而透光區ι81則位於第二反射面181 在上殼體180的—正投影區域中。由於透技181的大小 7/14 201202604 與位置’以及光源l7G的位置可依照設計需求調整，因此 本發明之透光區181與光源17〇的設置位置並不受限 實施例。 ' 第一反射面132可將光源17〇所發出的光線反射至逯鏡 陣列15G’然後透鏡陣列15Q會將所接收職光線引導至 第二反射© 134。第二反射面134則會將光線反射並通過 透光區181以成像於影像面19〇。在實際應用時，只要將 列印用的紙張通過影像面丨卯，就可以在紙張上成像。第 一反射結構131、透鏡陣列15〇及第二反射結構133在印 刷電路板110上的相對位置可隨光源170的位置及透鏡陣 列150的折射係數作調整，本實施例並不限定。 光發射裝置100的印刷電路板110可為長條狀，第一反射 結構131及第二反射結構133可經由微機電 (Microelectromechanical system, MEMS)技術分別形成第一 反射面132及第二反射面134。光源170包括至少一發光 二極體陣，其驅動電路可一併設置於印刷電路板110上， 光源170位於第一反射面132與透鏡陣列150之間。上殼 體180可覆蓋於第一反射結構131、第二反射結構133及 透鏡陣列150上，且上殼體180具有一透光區180，透光 區180的位置對應於第二反射面134的位置，透光區ι8〇 的長度則約與所需要列印的範圍大致相等。 在本貫施例中’由於第一反射結構131、第二反射結構 U3、透鏡陣列150及光源170皆是疊在印刷電路板11()上 ，而上殼體180亦是疊加於第一反射結構131、第二反射 結構133及透鏡陣列150上。因此’光發射裂置1 〇〇於組 裝時並無側向對位的問題，可提高組裝精準度及簡化組裝 8/14 201202604 。同時，光發射裝置1〇〇是利用兩個反射面改變光程， =樣的結構可使列印頭的體積扁平（薄型)化，相較於傳統的光 學印表頭具有較小的體積，非常適合應用於手持式電子裝置 或可攜式電子裝置，例如手機或筆記型電腦或小型印表機。 在本實施例中，第一反射結構131及第二反射結構133 可利用矽光學平台（si0B)形成，第一反射面132及第二反 射面134為光滑面或塗佈有反光材料以反射光線。光反射 面的形成方式，本實施例並不受限。第一反射面132用來 φ 反射來光源17〇所投射出的光線，而第二反射面134則用 來反射來自透鏡陣列150的光線。光源170可為單一光源 或具有多種波長的光源。光源170可包括單一波長的發光 二極體陣列或多個不同波長的發光二極體陣列，其設置方 式可依照設計需求而定，本實施例並不受限。 透鏡陣列150例如為曰本板硝子株式會社所生產之 SLA®(SELFOC®LensArray)或其他聚焦性透鏡陣列，用以 將第一反射面132所反射的光線折射並引導至第二反射面 φ 134。透鏡陣列150所導引的光線會被第二反射面134反射 而穿過透光區181。上殼體180的材料為不透光材質或是 表面塗佈有不透光顏料的遮光材質，而透光區181可為透 明玻璃、透明壓克力或開孔。 實際應用時，光發射裝置100可應用於發光二極體印 表頭以作為光源模組使用。具有微胞囊的相紙會經由機構 帶動而經過光發射裝置100的透光區181的上方。被照射 到光線的微胞囊會產生脆化反應，然後經滾輪滾碎後便可 在相紙上呈現出顏色，而未照射到光線的微胞囊則繼續保 持不破裂的狀態，並形成黑色。在本實施例中，光源170會 9/14 201202604 依照不同顏色的微胞囊所對應的光線波長產生不同波長的光 線以照射相片紙。舉例來說，微胞囊可分為青藍色(cyan)、洋 紅色(magenta)與黃色(yellow)三種，其對應的光線波長分別為 350nm、385nm與470nm。上述微胞囊與光線波長的對應關係 僅為範例，本實施例並不受限於此。若使用單一波長的光源17 〇 ’則相片紙需要經過至少三種不同波長的光發射裝置丨〇 〇照射 才能呈現出正確的顏色。若使用多波長的光源，則使用單 一的光發射裝置100來進行照射便可呈現出所需的色彩。 (第二實施例） 上述圖1中之光發射裝置100的結構可應用於發光二 極體印表頭。請參照圖3，圖3為根據本發明第二實施例 之發光二極體印表頭的示意圖。發光二極體印表頭包 括一光發射裝置210與一殼體230，光發射裝置21〇設置 在殼體230中。光發射裝置210的結構請參照圖2，光發 射裝置210的上殼體280具有透光區281，光發射裝置210 會經由透光區281發射光線出來。 實際應用時’光發射裝置210的光源（未繪示於圖3) 可包括多個發光二極體以符合所需的影像解析度，透光區 281的長度大約與所需列印的範圍相等，列印時，紙張會 通過光發射裝置210的影像面（位於透光區281的上方）以 接收發光裝置210所發出的光線。舉例來說，所需列印的 範圍為A4大小（211 mm X 298 mm)的紙張，且解析度為 600dpi，光發射裝置1〇〇可利用26條發光二極體陣列晶片 排成一列’每一條發光二極體陣列晶片包括192顆發光二 極體，即利用4992顆的發光二極體來實現，其中多^發光 二極體之間的間距(pitch)為42.3 um ° 10/14 201202604 在經由上述貫施例之說明後，本技術領域具有通常知 識者應可推知其實施方式，在此不加累述。此外，值得注 意的是’目2中發光二極體印表頭雖以—個光發射裝 置210為例说明’但本實施例中，設置在發光二極體印表 頭200中的光發射裝置的個數並不受限。在經由上述實施 例之《兄明後’本技術領域具冑料知識者應可推知其他實 施方式’在此不加累述。 乡示上所述The printer is a common computer output device, which can permanently output the data stored in the computer to the photographic film in text or graphic form. The printer is mainly divided into a monochrome printer and a color printer. The color printer is mainly black, and the color printer can be used as a photo printer to output beautiful photos. There are many types of printers, including laser pointers, inkjet printers and dot matrix printers. Others include thermal transfer printers (T^ermai Transfer Printer) and light sensing. Printer (Cylith0graphy printer) and so on. Photo-sensitive printers use optical transfer technology to print images. The optical transfer technology was developed into a commercial product by a company called Cycolor Inc., so this technology is also called "Cyiithographytechn〇i〇". Gy In phototransfer technology, pigments are pre-coated on special photographic papers. These coated pigments are first processed using microcapsules, which are tri-color pigments (blue, magenta and Yellow) First wrapped in light sensitive microcapsules. These microcapsules react chemically to specific wavelengths of light. The optical printhead in a photo-sensitive printer scans the surface of the paper with light of a specific wavelength, and the irradiated microcapsules produce an embrittlement reaction. The embrittled microcapsules are crushed by the pressure roller in the photo-sensitive printer to release the pigment to mix the desired color with 4/14 201202604. This photo-sensitive printer needs to be set. The domain of the generated wavelength, at present, the _wire=0 transfer head is made of a Light Emitting Diode (LED) array, and the light-emitting two lens can be used to transmit the focus and focus. (10), then the use of the mechanism too Na Na's stomach caused assembly accuracy is too low, and seeds [invention] In view of the above problems, the present invention proposes a small and low cost light emitting device and LED print head It can be quickly assembled and mass-produced to solve the problem of mass production of conventional optical printers. The light-emitting device of the present invention can be assembled using a superimposed manner, thereby achieving an assembly precision and a simplified assembly process. The present invention provides a light emitting device comprising a printed circuit board, a first reflecting structure, a first reflecting structure, a lens array, at least one light source, and an upper casing. The first reflective structure, the second reflective structure, the lens array and the light source are all disposed on the printed circuit board; the upper casing is disposed on the first reflective structure, the second reflective structure and the light source. Wherein the first reflective structure has a first reflective surface and the second reflective structure has a second reflective surface. The lens array is disposed between the first reflective surface and the second reflective surface. The light source is disposed between the first reflective surface and the lens array. The upper casing has a light transmitting region, and the light transmitting region corresponds to the second reflecting surface. In an embodiment of the invention, the first reflective structure is configured to reflect a light emitted by the light source, and the lens array directs the light reflected by the first reflective surface to the second reflective surface, and the light reflected by the second reflective surface Then it is sent through the light transmission area. 5/14 201202604 Pure (4)—Implementation, the above-mentioned light source is located in the /reflective surface in the /!•, reverse-positive projection area; the light-transmitting area is located in the second reflective surface in an area of a frontal projection. In an embodiment, the first reflective surface and the printed circuit are 45 degrees in height, and the first reflective surface is parallel to the second reflective surface. The present invention further provides a light-emitting diode print head, including a housing and at least one light emitting device. Each of the light emitting devices 1 includes a printed circuit board first reflective structure, a second reflective structure, a lens array, a light-emitting diode array, and an upper housing. The first reflective structure, the second reflective structure, the lens array and the LED array are all disposed on the printed circuit board, and the upper housing is disposed on the first reflective structure, the second reflective structure and the lens array. The first reflective structure has a first reflective surface, and the second reflective structure has a second reflective surface. The lens array is disposed between the first reflective surface and the second reflective surface. The array of light emitting diodes is disposed between the first reflective surface and the array of lenses. The upper casing has a light transmitting region, and the position of the light transmitting region corresponds to the position of the second reflecting surface. In summary, the present invention forms a structure having a double reflecting surface on a printed circuit board, so that the light source and the lens array can be integrated into a simple structure, thereby reducing the space occupied by the light emitting device and reducing the design cost. The optical system (ie, the light emitting device) proposed by the present invention uses two reflecting surfaces to change the optical path, so that the printing head can be flat (thinned) for integration into mobile electronic devices, such as a notebook computer. MID (M〇bile Intemet Device) mobile phone, etc. The above-described features and advantages of the present invention will become more apparent and obvious. The following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings. [Embodiment] (First Embodiment) Referring to Fig. 1 and Fig. 2 together, Fig. 1 is a schematic view of a light emitting device according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view showing a light-emitting device according to a first embodiment of the present invention. The light emitting device 1A includes a printed circuit board 110, a first reflective structure 131, a second reflective structure 133, a lens array 150, a light source 170, and an upper casing 180. The first reflective structure 131, the second reflective structure 133, the lens array 150, and the light source 170 are disposed on the printed circuit board 11A. The lens array 150 is disposed between the first reflective structure 131 and the second reflective structure 133. The light source 170 is disposed between the first reflective structure 131 and the lens array 150. The upper casing 180 is disposed on the first reflective structure 131, the second reflective structure 133, and the lens array 150. The light source 170 is disposed on the printed circuit board 11 and positioned at one side of the lens array 150, and the light transmitting region 181 is disposed on the upper casing 180 at a position opposite to the light source 170 on the other side of the lens array 15A. The position of the light transmitting area ι81 corresponds to the second reflecting surface 134, and the light reflected by the second reflecting surface 134 can pass through and be imaged on the image surface 19〇. The angle between the first reflecting surface 132 and the printed circuit board 110 is one! For example, 45 degrees, and the second reflecting surface 134 of the second reflecting structure 133 and the first reflecting surface 132 are parallel to each other. The first reflecting surface 132 faces the side of the lens array 15A, and the second reflecting surface 134 faces the other side of the lens array 150. The light source 170 is disposed between the first reflective surface 132 and the lens array 150 to emit light to the first reflective surface 132. In the present embodiment, the light source Π〇 is located in the first projection surface 132 in an orthographic projection area of the printed circuit board no, and the light transmission area ι81 is located on the second reflective surface 181 in the front projection area of the upper housing 180. in. Since the size of the transmissive 181 7/14 201202604 and the position 'and the position of the light source l7G can be adjusted according to design requirements, the arrangement position of the light transmitting region 181 and the light source 17A of the present invention is not limited to the embodiment. The first reflective surface 132 reflects the light emitted by the source 17 逯 to the 逯 mirror array 15G' and the lens array 15Q directs the received ray to the second reflection © 134. The second reflecting surface 134 reflects the light and passes through the light transmitting region 181 to be imaged on the image surface 19A. In practical applications, as long as the paper for printing is passed through the image area, it can be imaged on the paper. The relative positions of the first reflective structure 131, the lens array 15A, and the second reflective structure 133 on the printed circuit board 110 can be adjusted according to the position of the light source 170 and the refractive index of the lens array 150, which is not limited in this embodiment. The printed circuit board 110 of the light emitting device 100 may be elongated, and the first reflective structure 131 and the second reflective structure 133 may respectively form the first reflective surface 132 and the second reflective surface 134 via a microelectromechanical system (MEMS) technology. . The light source 170 includes at least one light emitting diode array. The driving circuit can be disposed on the printed circuit board 110. The light source 170 is located between the first reflective surface 132 and the lens array 150. The upper housing 180 can cover the first reflective structure 131, the second reflective structure 133, and the lens array 150, and the upper housing 180 has a transparent area 180, and the position of the transparent area 180 corresponds to the second reflective surface 134. The position, the length of the light-transmissive area ι8〇 is approximately equal to the range required to be printed. In the present embodiment, since the first reflective structure 131, the second reflective structure U3, the lens array 150, and the light source 170 are stacked on the printed circuit board 11 (the upper housing 180 is also superimposed on the first reflection) Structure 131, second reflective structure 133, and lens array 150. Therefore, the 'light-emitting cracking 1' has no lateral alignment when assembled, which improves assembly accuracy and simplifies assembly 8/14 201202604. At the same time, the light-emitting device 1 改变 changes the optical path by using two reflecting surfaces, and the structure of the sample can make the volume of the printing head flat (thin), which has a smaller volume than the conventional optical printing head. Ideal for handheld electronic devices or portable electronic devices such as cell phones or laptops or small printers. In this embodiment, the first reflective structure 131 and the second reflective structure 133 can be formed by using a 矽 optical platform (si0B), and the first reflective surface 132 and the second reflective surface 134 are smooth surfaces or coated with a reflective material to reflect light. . The manner in which the light reflecting surface is formed is not limited in this embodiment. The first reflecting surface 132 is used to reflect the light projected by the light source 17 φ, and the second reflecting surface 134 is used to reflect the light from the lens array 150. Light source 170 can be a single light source or a light source having multiple wavelengths. The light source 170 may include a single-wavelength LED array or a plurality of different wavelength LED arrays, which may be arranged according to design requirements, and the embodiment is not limited. The lens array 150 is, for example, an SLA® (SELFOC® LensArray) or other focusing lens array manufactured by 曰本板硝株式会社, for refracting and guiding the light reflected by the first reflecting surface 132 to the second reflecting surface φ 134. The light guided by the lens array 150 is reflected by the second reflecting surface 134 to pass through the light transmitting region 181. The material of the upper casing 180 is an opaque material or a light-shielding material coated with an opaque pigment, and the light-transmitting region 181 may be a transparent glass, a transparent acrylic or an opening. In practical applications, the light-emitting device 100 can be applied to a light-emitting diode print head for use as a light source module. The photographic paper having the microcapsules is driven by the mechanism to pass over the light transmitting region 181 of the light-emitting device 100. The microcapsules that are exposed to the light will produce an embrittlement reaction, and then the roller will be crushed to give a color on the photo paper, while the microcapsules that are not irradiated with light will remain unbroken and form a black color. . In this embodiment, the light source 170 will generate light of different wavelengths according to the wavelength of light corresponding to the microcapsules of different colors to illuminate the photo paper. For example, the microcapsules can be classified into three types: cyan, magenta, and yellow, and the corresponding light wavelengths are 350 nm, 385 nm, and 470 nm, respectively. The correspondence between the above microvesicles and the wavelength of light is merely an example, and the embodiment is not limited thereto. If a single-wavelength source 17 〇 ' is used, the photo paper needs to be illuminated by at least three different wavelengths of light-emitting devices to exhibit the correct color. If a multi-wavelength source is used, the desired color can be exhibited by using a single light-emitting device 100 for illumination. (Second Embodiment) The structure of the light-emitting device 100 of Fig. 1 described above can be applied to a light-emitting diode head. Please refer to FIG. 3. FIG. 3 is a schematic diagram of a light-emitting diode print head according to a second embodiment of the present invention. The light emitting diode head includes a light emitting device 210 and a housing 230, and the light emitting device 21 is disposed in the housing 230. Referring to Figure 2, the upper housing 280 of the light emitting device 210 has a light transmitting region 281 through which the light emitting device 210 emits light. In practical applications, the light source of the light emitting device 210 (not shown in FIG. 3) may include a plurality of light emitting diodes to meet the required image resolution, and the length of the light transmitting region 281 is approximately equal to the range of printing required. When printing, the paper passes through the image surface of the light emitting device 210 (above the light transmitting region 281) to receive the light emitted by the light emitting device 210. For example, if you want to print a sheet of A4 size (211 mm X 298 mm) with a resolution of 600 dpi, the light-emitting device 1 can be arranged in a row using 26 LED arrays. A light-emitting diode array chip includes 192 light-emitting diodes, that is, using 4,092 light-emitting diodes, wherein the pitch between the light-emitting diodes is 42.3 um ° 10/14 201202604 After the description of the above embodiments, those skilled in the art should be able to deduce the embodiments thereof, and will not be described herein. In addition, it is worth noting that the light-emitting diode print head of the second embodiment is described by taking a light-emitting device 210 as an example. However, in the present embodiment, the light-emitting device is disposed in the light-emitting diode print head 200. The number is not limited. Those skilled in the art having the above-described embodiments of the "brothers" may be inferred from other embodiments, which are not described herein. Said on the township
…科明印刷電路板作為基板，並在印刷電 路^形成雙反射結構，並將透鏡_設置在雙反射結構之間 傻^源經由反射結構的反射及經由透鏡的折射後聚焦在一影 積小且結構精簡的光發射裝置，不僅簡化 印===:本：所提_光二極體 化，以利整合人行動電子裝置；^ ’使列印頭可以扁平（薄型） 雖然本發明之較佳實施例已 於上述實施例，任何所屬技術領域二發明並不受限 離本發明所揭露之範圍内，+ /、有通㊉知識者，在不脫 發明之保護範圍應當以後附S3動與調整，因此本 月專利乾圍所界定者為準。 201202604 【圖式簡單說明】 圖1為根據本發明第一實施例之光發射裝置的示意圖。 圖2為根據本發明第一實施例之光發射裝置的剖面圖。 圖3為根據本發明第二實施例之發光二極體印表頭示意圖 〇 【主要元件符號說明】 100 :光發射裝置 110 :印刷電路板 131 :第一反射結構 132 :第一反射面 133 :第二反射結構 134 :第二反射面 150 :透鏡陣列 170 :光源 180 :上殼體 181 :透光區 190 :影像面 200 :發光二極體印表頭 210 :光發射裝置 230 :殼體 280 :上殼體 281 :透光區 θι、02 .夾角 12/14... Keming printed circuit board as a substrate, and in the printed circuit ^ form a double-reflective structure, and the lens _ is placed between the double-reflective structure, the source is reflected by the reflective structure and the refracting through the lens is focused on a small image. And the structure of the light-emitting device is simplified, not only to simplify printing ===: this: the proposed photo-polarization, in order to integrate the human mobile electronic device; ^ 'to make the print head flat (thin), although the invention is better The embodiments have been described in the above embodiments, and any of the technical fields of the present invention are not limited to the scope disclosed by the present invention, and those who have knowledge of + /, have access to the S3 movement and adjustment after the protection scope of the invention. Therefore, the definition of the patent dry circumference this month shall prevail. 201202604 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view of a light-emitting device according to a first embodiment of the present invention. Figure 2 is a cross-sectional view showing a light-emitting device according to a first embodiment of the present invention. 3 is a schematic view of a light-emitting diode printer head according to a second embodiment of the present invention. [Main component symbol description] 100: Light-emitting device 110: Printed circuit board 131: First reflective structure 132: First reflective surface 133: Second reflective structure 134: second reflective surface 150: lens array 170: light source 180: upper housing 181: light transmitting area 190: image surface 200: light emitting diode head 210: light emitting device 230: housing 280 : Upper housing 281: light transmission area θι, 02. Angle 12/14