M358310 五、新型說明： 【新型所屬之技術領域】 本創作係有關一種接觸式影像感測器(contact image sensor，CIS)，特別 有關一種接觸式影像感測器的導光系統。 【先前技術】 接觸式影像感測器一般用於掃描器、傳真機及影印機等光電產品中， 是一種頗為常見的影像感測器。接觸式影像感測器主要由發光二極體作运杜 # emittingdioc^LED)、聚焦透鏡、及感光單元構成。進行掃描文件時，發光 一極體作為光源將光線照射到文件上，入射光線經反射或透射後，反射光 或透射光通過聚焦透鏡聚焦至感光單元，藉由處理感光單元所產生電流信 號’即可得到文件掃瞄後的圖像資訊。 傳統使用紅藍綠發光二極體作為光源的接觸式影像感測器，可以應用 在-般文件晴描，但是若要顧在掃崎票或身份證的防偽設計圖案 時，必須將縣的紅藍紐光三極體取代為料光_光源。接 ♦觸式影像感測器作為掃聪文件之用，通常設計成長餘，為產生長條光帶， '業界一般採取導光板設計，紅藍綠發光二極體產生的光線在導光板内均勻 傳遞以照射出長條光帶。然而，傳統導紐制之塑·紫 外光的照射，因為塑料長時間經紫外光照射後本身會變質、變色、且易脆。 而且，紫外光發光二極_發光歧較小，無法單單藉由將縣的紅藍綠 發光二極體置換為紫外光二極體，而達到應用在择猫防偽設計圖案的目 的。如果使用紫外光二極體，整健構必須重新設計。 目前，採用紫外光光源的接觸式影像感測H，通常將許多個紫外光二 3 -M358310 〜極體封裝於如第1圖所示的長型殼體10，並依據客戶所要求的尺寸(如八4、 )將紫外光二極體排列成陣列的形式，排列時必須選用同等 級亮度的紫外光二極體。如第2圖所示，紫外光二極體r在y方向排成— 列’需注意的是’紫外光二極體22係排成陣列形式，非僅限於-列。此外， 因為紫外光二極體的發光角度較小，為提高出光時的光均勻度’必須將紫 外光二極體排列得非常密集。 現階段因為受限於紫外光二極體的發光角度與亮度的關係，難以有效 #地控制整條長型光帶的光均勻度。上述採用紫外光光源的接觸式影像感測 器之設計，整體掃描結果依然會有因紫外光二極體排列時固有的間隔㈣） 而產生的暗帶，導致出光時光均勻度不佳的情況，因而導致掃猫文件時， 所得出的圖像品質不佳。 此外’目前紫外光二極體約台幣15塊，紅藍綠發光二極體約台帶3 5 塊，紫外光二極體較紅藍綠發光二極體單價貴三至四倍。上述採用紫外光 光源的接觸式影像感測器之設計，因為需要使用為數眾多的紫外光二極體 籲排成陣列’最大的生產成本會落在紫外光二極體上。 ' 鑑於上述_料絲_觸絲縣·之缺失，技術人員進行 了探索與改進。 【新型内容】 本創作之-目的在於提供—種用於接觸式影像感測器使用紫外光光源 的導光系統。 本創作之另—目的在於改善接觸式影像_ ϋ出光時光均勻度不佳的 情況。 4 M358310 、本創作之另—目的在於減少接觸式影像感測器使用紫外光二極體的數 量，以降低生產成本。 依本創作之上述目的’本創作提供—種用於接觸式影像感測器的導光 系統’該絲系統包含—長型導光板及—料光光源嗦外光光源設於長 型導光板短邊之-側，長型導光板的底面具有一密度不等的喷砂層。喷砂 層之密度分佈顧雜料光絲的方向增加，料絲騎生之紫外光 經喷砂層髓後，自長餅光射減於姆層之—編射。 • 本創作之一方面，喷沙層係分成複數個區域，各區域的密度依遠離該 紫外光光源的方向明幂方式增加。於另_實施方式巾，噴沙層的密度分 佈係與距離紫外光光源的長度平方呈正比關係。 本創作之另-方面’該導光纽更包含—燈罩及—反射片。燈罩設於 紫外光光源厢並開設-開口，用於將紫外光光源產生的紫外光向一特定 方向發出。反射片具有-朝向該嘴沙層的反射面’用於反射紫外光光源產 生的紫外光。該長型導光板更具有—導角面’導角面係形胧長型導光板 籲中姆於射砂層之-側’祕將自長型導板出_紫外光導向—預定方 • 向。 本創作中，可採用玻璃為該長型導光板之材料，並可採用紫外光二極 體作為該紫外光光源。由於本創作採用玻璃為該長型導光板之材料，相較 於傳統導光板使用之塑料，本創作之導光板不會因長時間經紫外光照射而 變質、變色、易脆。 本創作中，接觸式影像感測器的導光系統僅需使用一顆紫外光二極 體，因此相較於傳統使用為數眾多的紫外光二極體排成陣列，本創作可以 M358310 大大降低使用紫外光二極體的數量，整體的生產成本大為降低。本創作中， 因導光系統僅需使用一顆紫外光二極體，不會有傳統使用眾多紫外光二極 體排列時固有的間隔，所以不會產生暗帶造成出光時光均勻度不佳的情況 發生。因此，利用本創作接觸式影像感測器的導光系統，在掃瞒文件時， 所得出的圖像0¾質顯著的提升。此外，由於本創作之導光系統僅需使用— 顆紫外光二極體，可以降低耗電量，具有環保節能的優點。 【實施方式】 請參閱第3 B ’該圖為本創作之接觸式影像感測器的導光系統之示意 圖。本創狀接赋影像制麟產生長條光帶設賴絲狀，並將導光 系統封裝於如第1騎不的長型麵1G，其帽3圖所示的導光系統係為 接觸式影像❹痛於y_z截關示_。鱗私齡要包括料光二極體 32、燈罩34、長型導光板35、及反射片355。紫外光二極體32設置於長型 導光板35短邊之一側’可產生用於掃瞒特殊型文件(如鈔票或身份證的防偽 設計圖案)職的料光。·導光板％的絲具有—經财砂處理的喷砂 層35〇 ’紫外光二極體幻發出的紫外光經噴砂層MO散射後，自相對於嘴 獨355之-側出射。由於所使用的光源為紫外光光源，長型導光板％可 知用玻雜質，以避免長時間經紫外光照射後導光板會變質、變色、易脆。 在依據客戶f求歧接赋影輸_尺寸(如M、Μ、从、Μ)後，選 擇對應長寬高的長型殼體10，並根據長型殼體1〇預設的規格，進行玻璃裁 切製作該長型導光板35。燈罩34設於紫外本 爷又於系外先一極體32周圍並開設一開口， 用於將务外光_極體32產生的紫外光向一特定方向發出，例如朝向長型導 先板35的方向。反射片扮具有一朝向該喷沙層的反射面，用於反射紫外 M358310 先：極體32產生的紫外光。燈罩％及反射片Ms可採用金屬材質或是鍵 薄臈的反射#。§進仃細文件時，料光二極體π發㈣紫外光會直 接虻喷砂層35〇散射，或者是經反射片奶反射再經喷砂層挪散射後， 自相對於噴砂層355之-侧出射。 月參閱第4a圖，該圖顯讀砂層3S()之密度分佈隨遠離紫外光二極體 的方向增加φ於紫外光二極體32為點狀光源，距離點狀光源愈遠處，M358310 V. New Description: [New Technology Field] This creation is about a contact image sensor (CIS), especially for a light guide system for a contact image sensor. [Prior Art] Contact image sensors are generally used in optoelectronic products such as scanners, facsimile machines, and photocopiers, and are a relatively common image sensor. The contact image sensor is mainly composed of a light emitting diode (DuPont), a focusing lens, and a photosensitive unit. When scanning a document, the light-emitting body acts as a light source to illuminate the light onto the document. After the incident light is reflected or transmitted, the reflected light or the transmitted light is focused by the focusing lens to the photosensitive unit, and the current signal generated by the photosensitive unit is processed. The image information after the file is scanned can be obtained. The traditional contact sensor that uses the red, blue, and green LEDs as the light source can be applied to the general document, but if you want to pay attention to the anti-counterfeiting design pattern of the Kawasaki ticket or ID card, you must The blue neon light body is replaced by a light source_light source. The ♦ touch image sensor is used as a swept file. Usually, it is designed to grow. In order to produce a long strip of light, the industry generally adopts a light guide plate design, and the light generated by the red, blue and green light emitting diodes is evenly distributed in the light guide plate. Pass to illuminate a long strip of light. However, the traditional Chinese-made plastic film and ultraviolet light are irradiated because the plastic itself deteriorates, discolors, and is brittle after being irradiated with ultraviolet light for a long time. Moreover, the ultraviolet light-emitting diodes have a small difference in light-emitting, and it is not possible to replace the red, blue, and green light-emitting diodes of the county with ultraviolet light-emitting diodes, thereby achieving the purpose of applying the cat anti-counterfeiting design pattern. If an ultraviolet diode is used, the entire structure must be redesigned. At present, contact image sensing H using an ultraviolet light source usually encloses a plurality of ultraviolet light diodes 3 - M358310 ~ poles in the elongated housing 10 as shown in Fig. 1 and according to the size required by the customer (eg VIII. 4) The ultraviolet light diodes are arranged in an array form, and the ultraviolet light diode of the same level of brightness must be selected when arranging. As shown in Fig. 2, the ultraviolet photodiodes r are arranged in the y direction. It should be noted that the ultraviolet photodiodes 22 are arranged in an array, not limited to the - columns. Further, since the light-emitting angle of the ultraviolet light-emitting diode is small, in order to improve the light uniformity at the time of light emission, the ultraviolet light-emitting diode must be arranged very densely. At this stage, it is difficult to effectively control the light uniformity of the entire long strip because it is limited by the relationship between the angle of illumination of the ultraviolet diode and the brightness. In the above-mentioned design of the contact image sensor using the ultraviolet light source, the overall scanning result still has a dark band due to the interval (4) inherent in the arrangement of the ultraviolet light diodes, resulting in poor uniformity of light emission time. When the cat file is scanned, the resulting image quality is poor. In addition, the current ultraviolet light diode is about 15 Taiwan dollars, the red, blue and green light-emitting diodes are about 35 pieces, and the ultraviolet light diode is three to four times more expensive than the red, blue and green light-emitting diodes. The above-mentioned contact image sensor design using an ultraviolet light source is required to use a large number of ultraviolet light diodes to be arranged in an array. The maximum production cost falls on the ultraviolet light diode. In view of the above-mentioned _ filaments _ touched the county, the technicians have explored and improved. [New Content] The purpose of this creation is to provide a light guiding system for a contact image sensor using an ultraviolet light source. The other part of this creation is to improve the contact image _ the situation where the light uniformity is poor. 4 M358310, Another creation of this creation – aims to reduce the production cost by reducing the number of UV diodes used in contact image sensors. According to the above purpose of the creation, the present invention provides a light guiding system for a contact image sensor. The wire system comprises a long light guide plate and a material light source, and the external light source is arranged on the long light guide plate. On the side-side, the bottom surface of the long light guide plate has a sandblasting layer of different densities. The density distribution of the sandblasting layer increases in the direction of the fiber strands, and the ultraviolet light that rides on the wire passes through the sandblasted layer, and the light from the long cake is reduced to the layer of the layer. • In one aspect of the creation, the sandblasting layer is divided into a plurality of regions, and the density of each region increases in a power-wise manner away from the direction of the ultraviolet light source. In another embodiment, the density distribution of the sandblasted layer is proportional to the square of the length of the ultraviolet light source. Another aspect of the creation is that the light guide also includes a lampshade and a reflective sheet. The lampshade is disposed in the ultraviolet light source chamber and has an opening-opening for emitting ultraviolet light generated by the ultraviolet light source in a specific direction. The reflective sheet has a reflecting surface toward the sand layer of the mouth for reflecting ultraviolet light generated by the ultraviolet light source. The long light guide plate further has a guide surface, a guide surface, and a long light guide plate. The middle side of the sand layer is called the side of the sand guide layer, and the light guide is directed to the front side. In the present invention, glass may be used as the material of the long light guide plate, and an ultraviolet light source may be used as the ultraviolet light source. Since the glass is the material of the long light guide plate, compared with the plastic used in the conventional light guide plate, the light guide plate of the present invention is not deteriorated, discolored or brittle due to long-time exposure to ultraviolet light. In this creation, the light guiding system of the contact image sensor only needs to use one ultraviolet light diode, so compared with the traditional use of a large number of ultraviolet light diodes arranged in an array, the creation can greatly reduce the use of ultraviolet light M358310 The number of polar bodies and overall production costs are greatly reduced. In this creation, since the light guiding system only needs to use one ultraviolet light diode, there is no inherent spacing when the conventional ultraviolet light diodes are arranged, so that the dark band does not cause the light uniformity when the light is out. . Therefore, with the light guiding system of the creative contact image sensor, the resulting image 03b is significantly improved when the file is broomed. In addition, since the light guiding system of the present invention only needs to use the ultraviolet light diode, the power consumption can be reduced, and the environmental protection and energy saving advantages are obtained. [Embodiment] Please refer to FIG. 3B'. This figure is a schematic view of the light guiding system of the contact image sensor of the present invention. The creation of the image-forming lining produces a long strip of light, and the light guiding system is packaged in a long profile 1G such as the first rider. The light guide system shown in the cap 3 is a contact type. The image is painful in y_z. The scaly age includes a light-emitting diode 32, a lampshade 34, a long light guide plate 35, and a reflection sheet 355. The ultraviolet diode 32 is disposed on one side of the short side of the long light guide plate 35 to generate a material for brooming a special type of document such as a security design pattern of a banknote or an identification card. • The % of the light guide plate has a sandblasted layer 35 〇 ‘ UV light emitted by the ultraviolet light diode is scattered by the sandblasting layer MO, and then emerges from the side opposite to the mouth 355. Since the light source used is an ultraviolet light source, the long light guide plate is known to use glass impurities to avoid deterioration, discoloration, and brittleness of the light guide plate after being irradiated by ultraviolet light for a long time. After obtaining the _ size (such as M, Μ, slave, Μ) according to the customer f, the long casing 10 corresponding to the length, width and height is selected, and according to the preset specifications of the long casing 1 , The long light guide plate 35 is cut by glass. The lamp cover 34 is disposed around the ultraviolet ray and the outer first body 32 and opens an opening for emitting ultraviolet light generated by the external light _ pole body 32 in a specific direction, for example, toward the elongated guiding plate 35. The direction. The reflective sheet has a reflecting surface facing the sandblasting layer for reflecting the ultraviolet light generated by the ultraviolet body M358310. The lamp shade % and the reflection sheet Ms can be made of a metal material or a thin reflection of the key #. § When entering a fine file, the photodiode π (four) ultraviolet light will be directly scattered by the sandblasting layer 35 ,, or after being reflected by the reflective sheet milk and then scattered by the sand blasting layer, since the blasting layer 355 - Side shot. Referring to Figure 4a, the density distribution of the sand layer 3S() is increased with the distance from the ultraviolet diode. The ultraviolet light diode 32 is a point light source, and the farther away from the point light source,
^ "岔又刀佈越小。一般而言，喷砂層35〇的密度愈高，可以散射愈多的 先。為達出光時的光均勻度’長型導光板％中喷砂層⑽距離料光二極 愈C的。p伤’其进度應愈高，以平衡紫外光二極體幻發出的紫外光 經喷砂層35〇散射的光量。當紫外光自相對於喷砂層挪之一側出光時， 出光的亮度呈均句分伟。 請參閱第4b圖，該酬示喷砂層35G分成複數麵域，其中各區域的 松度依遇離紫外光二極體32的方向以增幂方式增加。於一實施例中，喷沙 層350刀成八個區域，最接近紫外光二極體％的區域密度為〇,其餘各區 Φ 域的密度比為1 :2:3:4:5。 月參閱第4c ® ’該圖顯示喷沙層3s〇的密度分佈係與距離紫外光二極 體32的長度平方呈正比關係。由於紫外光二極體幻為點狀光源，點狀光 源光密度〃佈與轉成平方反比，今藉由將噴沙層⑽的密度分佈隨距離 紫卜光極體32的長度，以該長度的平方增加，以抵補紫外光隨距離銳減 的影響。舉例而言’噴沙層35G的密度分佈為如第如圖所示具有隨距離紫 外光-極體32的長度呈平方增加的特性。 "月參閱第5圖’該圖顯示本創作之導光系統為於接觸式影像感測器只 M358310 截面的示意圖。如第5圖所示，長型導光板35具有-導角面5卜導角面 开少成於長型導光板35中相對於喷砂層35〇之—側，具有將自長型導板 35出射的料光導向—歡額的魏，以使料鮮確地人射至待掃瞒 文件。 上述實施例僅是為了讓本領域技術人員理解本創作而提供的最優選的 實施模式。補倾不·於上料雜施对。姉本賴技術人員所 易於思及的改進均在本創作的構思之内。 【圖式簡單說明】 下面結合附圖對本創作的技術方案進行詳細說明。 第1圖顯示接觸式影像感測器的長型殼體之示意圖。 第2圖顯示傳統細式影像_賴職陣卿式的料光二極 體之示意圖。 第3圖顯示本創作之接觸式影像感測器的導光系統之示意圖。 第4a圖顯示喷砂層之密度分佈隨遠離紫外光二極體的方向增加。 第4b圖顯示喷砂層分成複數個區域，各區域的密度依遠離紫外光二極 _方向以增幂方式增加。 第4c圖顯示噴沙層的密度分佈係與距離紫外光二極體的長度平方呈正 比關係。 第5圖顯示本創作之導光系統於接觸式影像感測器χ_ζ截面的示意圖。 【主要元件符號說明】 10 長型殼體 22 紫外光二極體 M358310 32 紫外光二極體 34 燈罩 35 長型導光板 350 噴砂層 355 反射片 51 導角面^ "岔The smaller the knife. In general, the higher the density of the sandblasted layer 35, the more it can be scattered. In order to achieve light uniformity when light is emitted, the sandblasting layer (10) in the long light guide plate is from the light-emitting diode to C. The p-injury's progress should be higher to balance the amount of light scattered by the ultraviolet light emitted by the ultraviolet dipole through the sandblasted layer 35〇. When the ultraviolet light is emitted from one side of the sandblasting layer, the brightness of the light is uniform. Referring to Fig. 4b, the blasting layer 35G is divided into a plurality of regions in which the looseness of each region increases in a power-increasing manner in the direction away from the ultraviolet diode 32. In one embodiment, the sandblasting layer 350 is formed into eight regions, the density of the region closest to the ultraviolet light diode % is 〇, and the density ratio of the Φ regions of the remaining regions is 1:2:3:4:5. See Figure 4c ® '. This figure shows that the density distribution of the sandblasted layer 3s〇 is proportional to the square of the length of the ultraviolet photodiode 32. Since the ultraviolet light dipole is a point light source, the optical density of the point light source is inversely proportional to the square of the square light source, and the density distribution of the sandblasting layer (10) is proportional to the length of the purple light electrode body 32 by the length. The square is increased to compensate for the sharp decrease in ultraviolet light with distance. For example, the density distribution of the sandblasting layer 35G has a characteristic of increasing squared with the length of the ultraviolet light-polar body 32 as shown in the figure. "Monthly refer to Fig. 5' This figure shows the light guiding system of the present invention as a schematic view of the M358310 cross section of the contact image sensor. As shown in FIG. 5, the long light guide plate 35 has a guide surface 5 and a guide surface opening is formed on the side of the long light guide plate 35 with respect to the sandblasting layer 35, and has a self-long guide plate. 35 out of the material light guide - the amount of Wei, so that the material is accurately shot to the file to be broom. The above-described embodiments are merely the most preferred modes of implementation provided by those skilled in the art in understanding the present invention. Replenishment is not necessary. The improvements that are easy to think of by the technicians are all within the concept of this creation. BRIEF DESCRIPTION OF THE DRAWINGS The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. Figure 1 shows a schematic view of a long housing of a contact image sensor. Figure 2 shows a schematic diagram of a conventional fine-grained image. Figure 3 shows a schematic diagram of the light guiding system of the contact image sensor of the present invention. Figure 4a shows that the density distribution of the sandblasted layer increases as it moves away from the ultraviolet light diode. Figure 4b shows that the blasting layer is divided into a plurality of regions, and the density of each region increases in a power-up manner away from the ultraviolet light dioxin. Figure 4c shows that the density distribution of the sandblasted layer is proportional to the square of the length of the ultraviolet light diode. Fig. 5 is a schematic view showing the cross section of the light guiding system of the present invention in the contact image sensor. [Main component symbol description] 10 Long case 22 Ultraviolet diode M358310 32 Ultraviolet diode 34 Lamp cover 35 Long light guide plate 350 Sandblasting layer 355 Reflector 51 Leading surface