201217895 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種螢幕，特別是指一種抗光性好、 馬黑白對比度、增益高’及半增益值的視角可達1 75度以 上的光學投影螢幕。 【先前技術】 參閱圖1 ’投影螢幕1 一般多用在電影院、會議室、家 庭劇院，將來自一投影機丨丨的一投射光丨2，利用漫射或反 射的方式呈現在投影螢幕丨上。在該投射光12的方向固定 、光通量不變的情況下，投影螢幕丨漫射及反射光束的亮 度與該投射光12的比值稱為投影螢幕丨增益值（Gain)。而 在水平方向，技影螢幕1的增益值由十心向外逐漸遞減， 疋義一可觀賞半增益值（Half Gain)的角度為半增益視角0。 由於一般的投影螢幕1易漫射或反射周遭其他光源， 因此在投影時需要在較為黑暗的環境才能得到較好的視覺 效果，但這對教學或會議室的場合中觀眾卻難使用紙筆書 寫文字，因此便有業者進一步進行改良。 配合參閱圖2,為美國專利第US6,747,796號專利案， 該專利案揭露了一種在投影螢幕丨的一本體1〇表面塗佈一 層微玻璃珠粒子13的技術方案，利用該等微玻璃珠粒子13 的折射圓面將一定之投影光折射至觀看者上，提高該投影 螢幕1的增益值，但也由於其圓面結構，容易折射其它外 來光線，使得投影螢幕1的半增益視角約在4〇〜7〇度之間 ，不僅可視角變的窄小，亦無法滿足人數較多的場=使= 201217895 因此，習知技術確實具有下列嚴重的缺點： 一、 抗光性差 傳統投影登幕1容易漫射或反射周遭其他光源， 因此在投影時，需要在較為黑暗的環境才能得到較好 的視覺效果，故抗光性差。 二、 增益高可視角卻窄小 美國專利US6,747,796號案雖然可以提高傳統投影 勞幕1的增益值，使其抗光性獲得改善，但也因其圓 面結構容易折射其它的外部光線，使得視角在4〇〜 度之間增益值才有明顯增加的效果，因此視角 當窄小。 三、 使用環境受限 承上所述，由於視角變的窄小，所以不適合在觀 眾散落廣佈的觀賞環境下使用，因此該投影#幕】的 泛用性差，難以符合不同的使用需求。 四、低黑白對比度 由於受到外來光線之反射及折射，且沒有提高彩 色飽和與黑白對比度的功能，因此呈現的影像為低彩 色飽和度和低黑白對比度。 【發明内容】 因此，本發明之目的，即在提供—種可以抗光性好、 增益高、高彩色飽和度，及半增益的視角可達175度以上 的光學投影螢幕。 201217895 於是’本發明光學投影螢幕，包含一基膜、一透鏡層 、一反射層、一表面膜及一擴散層。 該透鏡層形成於該基膜上，且具有多數微透鏡結構。 該反射層形成於該透鏡層上，用於將一入射光反射並改變 角度成一反射光。該表面膜位於該反射層上，有高透光率 並使該反射光透出。該擴散層形成於該表面膜上，且表面 呈凹凸不平整狀有抗炫光、抗刮的功效，該擴散層並具有 多數奈米級的黑色顆粒。 本發明之有益功效在於：該反射層將一來自投影機的 入射光改變角度並反射為一出射光，並由凸面鏡原理擴大 該反射光的反射角度，同時提高增益值，再利用該擴散層 表面呈凹凸不平整狀，使該出射光擴散、增加視角及高彩 色飽和度，並能避免外在光線的干擾’因此抗光性好、增 益高，及半增益值的視角可達175度以上，所以泛用性高 可以滿足不同的使用場合。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之一個較佳實施例的詳細說明中，將可 清楚的呈現。 參閱圖3與圖4，為本發明光學投影螢幕2〇〇之較佳實 施例。該較佳實施例包含一基膜2、一位於該基膜2底部的 底膜3、一形成於該基臈2上的透鏡層4、一形成於該透鏡 層4上的反射層5、一位於該反射層5上的表面膜6、一形 成於該表面膜6上的擴散層7 —形成在該擴散層7上的抗 201217895 炫光抗到層72，及二分別位於該基膜2與底膜3及該反射 層5與表面膜6之間的感壓膠層8。 該底膜3具有一鄰近該基膜2且不透光的塗料部31， 及一與該塗料部3 1連接的保護部3 2。該塗料部3 1可避免 一入射光91穿透過該基膜2造成光線的損失，與避免來自 該光學投影螢幕200背面的光線影響投影效果，同時，該 保遵部3 2具有不易沾黏辨污、可清洗的優點。該透鏡層4 之表面上形成有多數呈連續弧形的微透鏡結構41，且相鄰 兩弧形之中心位置的間距為ΙΟμΓη〜1〇〇μπι。 該反射層5是以高反射率的金屬材質所製成，並選自 於由下列所構成的群組：銀、鋁之高反射性材料，且厚度 範圍為10nm〜10〇nm。於本實施例中，該反射層5的材質是 選自於銀，但不以此為限，所有的高反射率金屬皆應涵蓋 在範圍内。因為該等微透鏡結構41的形狀，使該反射層5 能將該入射光91反射並改變角度成一出射光％，同時提高 該出射光92的增益值。 之不平整， 該表面膜6具有高透料，並使該出射S 92能透出。 該擴散層7表面呈凹凸不平整狀，且具有多數奈米級且佔 體積百分比G.l%〜1%的黑色顆粒71。該抗炫光抗到層㈣ 用微結構成型技術，使該抗炫光抗刮層72貼覆於該擴散層 7的表面，且表面同樣呈凹凸不平整狀。當該出射經 過該擴散層7時’利用該等黑色顆粒71佔有的體積百分比 例’可調整該出射光92的黑白對比度與彩色飽和度，以因 應不同需求的場合H洲抗炫光抗到層72 6 201217895 的表面使該出射光92擴散射出、視角變大，能同時減少外 來光線進入該擴散層7，避免外在光線的干擾，並具有抗刮 的效果。 特別說明的是，若黑色顆粒71的比例太多（>1%)，該 出射光92則會變得較為暗淡，若黑色顆粒71的比例太少 (<〇.1%)，則該出射光92會無明暗對比而顯得過亮，且圖3 中該等奈米級黑色顆粒71的比例與大小僅為方便標示及說 明用’並非以實際佔有比例、大小繪製。 至於該等感壓膠層8是分別位於該底膜3與該基膜2 , 以及該反射層5與該表面膜6之間，並且同樣具有高透光 率，用以方便多層膜黏合與成形。 由於δ玄底膜3、基膜2、表面膜6皆為可撓性材質所製 成，因此本發明的光學投影螢幕2〇〇可脊曲捲收，易於收 納、攜帶’並可組裝成多種的態樣，以因應不同的環境使 用。 參閱圖5’為一增益/視角數據比較圖，在進行說明之 前’需要注意的是’在水平方向’該光學投影螢幕200的 增益值由中心向外逐漸遞減，定義一可觀賞半增益值（Half Gain)的角度為半增益視角。 其中’圖5中X軸表示視角，γ軸表示增益值。經本 案發明人實測結果，一般的光學螢幕’在增益提高時，視 角則會相對漸漸縮小，例如在增益值4的時候，半增益視 角約只有3 0度（± 1 5度）。然而，通過本發明光學投影螢幕 200之結構设計可將增益值提南至3 ·5，但半增益視角仍可 201217895 達175度（±87·5度）以上。 由以上說明可知’本發明光學投影螢幕200之較佳實 施例確實具有下列優點： 一、 防刮且抗光性佳 本發明抗炫光抗刮層72的表面呈凹凸不平整 狀有抗刮的功效，並能夠減少外來光線進入該擴散 層7 ’避免外來光線的干擾，因此抗光性佳。 二、 增益值高、畫面對比及色彩飽和度佳 本發明之光學投影螢幕200利用該反射層5可 提高該出射光92的增益值，且配合該擴散層7中 所摻入的奈米級黑色顆粒71，使得該出射光92具 有明亮的黑白對比及彩色飽和度。 三、 視角大泛用性高且易於收納、攜帶 光學投影螢幕200的出射光92經利用該反射 層5的凸面鏡原理及經過該擴散層7與抗炫光抗到 層72凹凸不平整的表面時，使該出射光92會更向 外側擴散，視角變大’所以不論觀眾是座落於該光 學投影螢幕200的正前方或是散落於大角度方位的 區域中，都可以清楚地進行觀賞，同時，藉由抗光 性的優勢，不論所處環境光線明亮與否，皆不受影 響。此外’該底膜3、基膜2、表面膜6昏為可撓 性材質製成，可彎曲捲收，易於收納、攜帶。 综上所述，本發明之光學投影螢幕200利用該反射層5 將一來自投影機的入射光91反射為一出射光92，該出射光 201217895 92經由該反射& 5提高增益值及擴大反射角，再利用該擴 散層7與抗炫光抗刮層72表面呈凹凸不平整狀使該出射 光擴散、增加視角，並能避免外在光線的干擾，因此抗光 性好、增益高，及半增益值的視角可達175度以上，同時 該擴散層7使該出射光92具有較佳的黑白對比度與飽和度 ，又能提供增加視角、抗光、抗刮的作用，故確實能達成 本發明之目的。 准以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 201217895 【圖式簡單說明】 圖1是一立體圖’說明一習知投影螢幕的使用方式· 圖2是一剖面圖，說明該投影螢幕的一本體之* QQ 塗 佈多數微玻璃珠粒子； 圖3是一立體圖，說明本發明光學投影螢幕之較佳實 施例； 圖4是一剖面圖，說明該較佳實施例之各層結構；及 圖5是一數據圖’說明該較佳實施例的功效。 10 201217895 【主要元件符號說明】 200 .......光學投影螢幕 2 ..........基膜 3 ..........底膜 31 .........塗料部 32 .........保護部 4 ..........透鏡層 41.........微透鏡結構 5 ..........反射層 6 ..........表面膜 7 ..........擴散層 71.........黑色顆粒 7 2.........抗炫光抗刮層 8 ..........感壓膠 91 .........入射光 92 .........出射光201217895 VI. Description of the Invention: [Technical Field] The present invention relates to a screen, in particular to a light-resistant, horse-black-and-white contrast, high gain', and half-gain value angle of up to more than 170 degrees. Optical projection screen. [Prior Art] Referring to Fig. 1, the projection screen 1 is generally used in a movie theater, a conference room, a home theater, and a projection diaphragm 2 from a projector 呈现 is projected on the projection screen by means of diffusion or reflection. When the direction of the projection light 12 is fixed and the luminous flux is constant, the ratio of the brightness of the diffused and reflected beam of the projection screen to the projected light 12 is referred to as the projection screen gain value (Gain). In the horizontal direction, the gain value of the technical screen 1 is gradually decreased from the tenth center outward, and the angle of the half gain value (Half Gain) is a half gain angle of view 0. Since the general projection screen 1 is easy to diffuse or reflect other light sources around, it is necessary to obtain a better visual effect in a darker environment during projection, but it is difficult for a viewer to use a pen and paper for writing in a teaching or conference room. The text is therefore further improved by the industry. Referring to FIG. 2, it is a US Patent No. 6,747,796, which discloses a technical solution for coating a surface of a body of a projection screen with a layer of micro-glass bead particles 13 by using the micro-glass beads. The refracting circular surface of the particle 13 refracts a certain projection light onto the viewer to increase the gain value of the projection screen 1, but also because of its round-face structure, it is easy to refract other external light, so that the half gain angle of the projection screen 1 is about Between 4〇 and 7〇, not only can the viewing angle become narrow, but also the field with a large number of people = = 201217895 Therefore, the conventional technology does have the following serious shortcomings: 1. The traditional projection of light resistance is poor. 1 It is easy to diffuse or reflect other light sources around, so when projecting, it is necessary to obtain better visual effects in a darker environment, so the light resistance is poor. Second, the gain is high, but the viewing angle is narrow. Although the US Patent No. 6,747,796 can improve the gain value of the conventional projection screen 1 and improve its light resistance, it is also easy to refract other external light due to its round surface structure. The gain value of the viewing angle between 4 〇 and ̄ degrees has a significant increase effect, so the viewing angle is narrow. Third, the use of environmental constraints As mentioned above, because the viewing angle has become narrow, it is not suitable for use in the viewing environment where the audience is scattered. Therefore, the generality of the projection # is poor, and it is difficult to meet different usage requirements. Fourth, low black and white contrast Because of the reflection and refraction of external light, and does not improve the color saturation and black and white contrast, the image presented is low color saturation and low black and white contrast. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an optical projection screen that has good light resistance, high gain, high color saturation, and a half gain angle of view of up to 175 degrees. 201217895 Thus, the optical projection screen of the present invention comprises a base film, a lens layer, a reflective layer, a surface film and a diffusion layer. The lens layer is formed on the base film and has a plurality of microlens structures. The reflective layer is formed on the lens layer for reflecting an incident light and changing the angle to a reflected light. The surface film is located on the reflective layer and has a high light transmittance and allows the reflected light to pass through. The diffusion layer is formed on the surface film, and the surface has an unevenness and an anti-glare and scratch resistance effect, and the diffusion layer has a plurality of nano-grade black particles. The beneficial effect of the invention is that the reflective layer changes the angle of incident light from the projector and reflects it as an outgoing light, and expands the reflection angle of the reflected light by the convex mirror principle, and simultaneously increases the gain value, and then uses the surface of the diffusion layer. It is uneven and uneven, which makes the emitted light diffuse, increases the viewing angle and high color saturation, and can avoid the interference of external light. Therefore, the light resistance is good, the gain is high, and the viewing angle of the half gain value can reach 175 degrees or more. Therefore, high versatility can meet different use occasions. The above and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to Figures 3 and 4, a preferred embodiment of the optical projection screen 2 of the present invention is shown. The preferred embodiment comprises a base film 2, a base film 3 at the bottom of the base film 2, a lens layer 4 formed on the base 2, and a reflective layer 5 formed on the lens layer 4. a surface film 6 on the reflective layer 5, a diffusion layer 7 formed on the surface film 6, an anti-201217895 glare-resistant layer 72 formed on the diffusion layer 7, and two on the base film 2 and The base film 3 and the pressure sensitive adhesive layer 8 between the reflective layer 5 and the surface film 6. The base film 3 has a coating portion 31 adjacent to the base film 2 and opaque, and a protective portion 32 connected to the coating portion 31. The coating portion 31 prevents the incident light 91 from penetrating through the base film 2 to cause light loss, and avoids the light from the back surface of the optical projection screen 200 from affecting the projection effect. At the same time, the security portion 3 2 is not easily adhered. The advantages of dirt and washability. A plurality of microlens structures 41 having a continuous arc shape are formed on the surface of the lens layer 4, and the pitch of the center positions of the adjacent two arcs is ΙΟμΓη~1〇〇μπι. The reflective layer 5 is made of a metal material having a high reflectance and is selected from the group consisting of silver and aluminum highly reflective materials and having a thickness ranging from 10 nm to 10 Å. In this embodiment, the material of the reflective layer 5 is selected from silver, but not limited thereto, all of the high reflectivity metals should be included in the range. Because of the shape of the microlens structure 41, the reflective layer 5 is capable of reflecting the incident light 91 and changing the angle to an exit light % while increasing the gain value of the exit light 92. The unevenness of the surface film 6 has a high permeability and allows the exiting S 92 to pass through. The surface of the diffusion layer 7 has irregularities and irregularities, and has black particles 71 having a majority of nanometers and accounting for a volume percentage of G.1% to 1%. The anti-glare light-resisting layer (4) is subjected to a microstructure forming technique to adhere the anti-glare scratch-resistant layer 72 to the surface of the diffusion layer 7, and the surface is also uneven. When the exiting through the diffusion layer 7, the 'volume percentage occupied by the black particles 71' can adjust the black-and-white contrast and color saturation of the emitted light 92 to meet the different needs of the H-based anti-glare resistance layer. The surface of 72 6 201217895 diffuses and emits the emitted light 92, and the viewing angle becomes large, and can simultaneously reduce external light entering the diffusion layer 7, avoid interference of external light, and have a scratch-resistant effect. Specifically, if the ratio of the black particles 71 is too large (> 1%), the emitted light 92 becomes dimmer, and if the ratio of the black particles 71 is too small (<1%), The outgoing light 92 will appear too bright without contrast, and the proportion and size of the nano black particles 71 in Fig. 3 are only for convenience of labeling and description, and are not drawn in actual proportion and size. The pressure sensitive adhesive layer 8 is located between the base film 3 and the base film 2, and between the reflective layer 5 and the surface film 6, and also has high light transmittance for facilitating adhesion and formation of the multilayer film. . Since the δ Xuan base film 3, the base film 2, and the surface film 6 are all made of a flexible material, the optical projection screen 2 of the present invention can be entangled, easily accommodated, carried, and assembled into a plurality of types. The way to use in response to different environments. Referring to FIG. 5' as a gain/view data comparison chart, before the description is made, it should be noted that the 'in the horizontal direction' is that the gain value of the optical projection screen 200 is gradually decreased from the center outward, and a half-gain value is defined. The angle of Half Gain) is a half gain angle of view. Wherein the arrow X represents the angle of view and the γ axis represents the gain value. As a result of the inventor's actual measurement, the general optical screen's angle of view is gradually reduced as the gain is increased. For example, at a gain value of 4, the half gain angle is only about 30 degrees (± 15 degrees). However, the design of the optical projection screen 200 of the present invention can increase the gain value to 3·5, but the half gain viewing angle can still be 175 degrees (±87·5 degrees) or more in 201217895. It can be seen from the above description that the preferred embodiment of the optical projection screen 200 of the present invention has the following advantages: 1. Anti-scratch and light resistance. The surface of the anti-glare scratch-resistant layer 72 of the present invention has irregularities and scratch resistance. Efficacy, and can reduce the external light into the diffusion layer 7 'to avoid interference from external light, so the light resistance is good. Second, the gain value is high, the picture contrast and the color saturation are good. The optical projection screen 200 of the present invention can increase the gain value of the outgoing light 92 by using the reflective layer 5, and cooperate with the nano-black incorporated in the diffusion layer 7. The particles 71 are such that the exiting light 92 has a bright black and white contrast and color saturation. 3. The exiting light 92 having a large viewing angle and being highly versatile and easy to receive and carry the optical projection screen 200 is subjected to the convex mirror principle using the reflective layer 5 and the uneven surface of the layer 72 through the diffusion layer 7 and the anti-glare resistance layer Therefore, the emitted light 92 is more diffused to the outside, and the angle of view becomes larger, so that the viewer can be clearly viewed regardless of whether the viewer is located directly in front of the optical projection screen 200 or scattered in a large-angle orientation. With the advantage of light resistance, no matter whether the ambient light is bright or not, it is not affected. Further, the base film 3, the base film 2, and the surface film 6 are made of a flexible material, which can be bent and wound, and is easy to store and carry. In summary, the optical projection screen 200 of the present invention uses the reflective layer 5 to reflect an incident light 91 from the projector into an outgoing light 92, and the emitted light 201217895 92 increases the gain value and enlarges the reflection via the reflection & The angle of the diffusion layer 7 and the surface of the anti-glare scratch-resistant layer 72 are uneven, so that the emitted light is diffused, the viewing angle is increased, and interference of external light is avoided, so that the light resistance is good and the gain is high, and The viewing angle of the half gain value can reach 175 degrees or more. At the same time, the diffusion layer 7 has better black-and-white contrast and saturation, and can provide an increase in viewing angle, anti-light and scratch resistance, so that the present invention can be achieved. The purpose of the invention. The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. 201217895 [Simplified illustration of the drawings] Fig. 1 is a perspective view showing the use of a conventional projection screen. Fig. 2 is a cross-sectional view showing a body of the projection screen. * QQ coating most micro glass beads particles; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 is a cross-sectional view showing the structure of each layer of the preferred embodiment; and FIG. 5 is a data diagram illustrating the function of the preferred embodiment. 10 201217895 [Description of main component symbols] 200 ....... Optical projection screen 2 .......... base film 3 .......... base film 31 .... ..... paint portion 32 ... ... protection portion 4 ..... lens layer 41 ... ... microlens structure 5 .... ...reflecting layer 6 .......... surface film 7 ..... diffusion layer 71 ... ... black particles 7 2. .......anti-glare scratch-resistant layer 8 ..........pressure-sensitive adhesive 91 ......... incident light 92 ......... Light