200844473 人 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種光學鏡片，特別是指一種可減少 迷光（stray light)的光學鏡片。 【先前技術】 參閱圖1，習知一種光學鏡片1包含··一基材U、一形 成於該基材11上的增反射膜12、一形成於該基材11與該 ( 增反射膜12之間的反射膜13，及一形成於該反射膜13及 該基材之間11的緩衝膜14。 該光學鏡片1 一般是根據不同光機模組（〇pticai module) 的幾何設計條件而被組裝於其光機模組中（圖未示），並藉由 設置於光機模組内部的一入射光源組（圖未示）所產生的光源 並配合該光學鏡片1，以提供該光機模組一特定反射特性。 該入射光源組所產生的光源通常會於該光機模組中構成一 環境（ambient)光源；然而，此環境光源亦會進一步地經該 、 光學鏡片1的基材U之一側面15行進，並於該基材u内 形成複數個反射路徑，以致使該環境光源藉由該等反射路 僅於該基材11内部相互干涉並造成迷光的問題，進而影響 光機模組的整體運作品質。 有鑑於此，依據光學理論，若物體吸收了部分可見光 的能量，會致使光強度變弱，並使物體呈現出特定的顏色 。例如，若不會吸收光，則物體仍然是呈現透明；若吸收 了所有的光，則物體便呈現黑色。因此，為消除前述迷光 的問題，常見者則有藉由在該基材u的端面15形成一累色 200844473 的塗墨層（圖未示）作為消光物質，利用黑色塗墨層可吸收所 有可見光的技術手段，以防止該環境光源干擾該光學鏡片j 的正常效能。 “再者，依據理論，在特定的光波長下，光的吸收量與 肩光物貝的厚度、濃度有關，當消光物質的厚度越厚則光 的吸收里越大，且當消光物質的濃度越高則光的吸收量亦 =大。但須注意的是，此前提只限於消光物質是以特定的 /辰度|&圍’並且是均勻、平整地披覆於物體表面。若消光 物質的濃度發生變化，或產生離解、聚合等現象，將無法 達到防止該環境光源干擾的理想效果。 因此，對於以塗墨層作為消光物質之習知技術而言， 在無法確切地掌握塗墨層的濃度範圍與披覆均勻性及平整 性的前提下，該基材Π端面15的塗墨層之均勻性與否，以 及光波在不平整之塗墨層表面的散射、多重反射等其它更 複雜的情況，將進一步地影響該光機模組的運作品質。此 外，該光機模組於運作過程中所產生的環境溫度亦將致使 該基材U端面的塗墨層產生揮發，經過日積月累的運作 下，該基材Π端面15的塗墨層對於削減迷光問題的貢獻度 亦將因無法符合信賴性的要求而降大幅地下降。 因此，改善光學鏡片因環境光源所致的逑光問題，此 二，使得光學鏡片得以承受光機模組之環境溫度的考驗以 符合信賴性的要求，進而增加光機模組的運作品質，是當 前開發光學鏡片相關領域者所待突破的課題。 田 【發明内容】 200844473 因此’本發明之目的，即在提供一種可減少迷光的光 學鏡片。 於是’本發明可減少迷光的光學鏡片，是用於一光機 模組’包含：一具有兩呈相反設置的表面及複數連接該等 表面之側面的基材、一形成於該基材之其中一表面的反射 層 形成於該反射層與該基材之間的緩衝層，及至少一 形成於該基材之其中一側面的吸收膜。該吸收膜是採用非 有機材料。該吸收膜於可見光波段内的平均消光係數是至 >大於0.01 ’且該吸收膜之非有機材料是採用金屬材料或 非金屬材料。 另，本發明亦提供一種可減少迷光的光學鏡片，是用 於光機核組，包含··_具有兩呈相反設置的表面及至少 一連接該等表面的側面之基材、一形成於該基材之其中一 表面的光予薄膜，及至少一形成於該基材之側面的吸收膜 。該吸收膜是採用非有機材料，且該吸收膜於可見光波段 内具有一平均消光係數。 本發明的功效在於，改善設置於光機模級中的光學鏡 片因受到環境光源的影響所致的迷光問題，此外，亦使得 光學鏡片得以承受光機模組之環境溫度的考驗以符合信賴 性的要求’進而增加光機模組的運作品質。 【實施方式】 以 清楚的呈現 有關本發明之前述及其他技術内容、特點與功效，在 下配合參考圖式之三個較佳實施例的詳細說明中，將可 200844473 在本發明被詳細描述之前，要注意的是，在以下的說 明内容中，類似的元件是以相同的編號來表示。 參閱圖2及圖3，本發明可減少迷光的光學鏡片之一第 一較佳實施例，是用於一光機模組（圖未示），包含：一具有 兩呈相反设置的表面21及兩連接該等表面21之側面22的 基材2、一形成於該基材2之其中一表面21的光學薄膜， 及至少一形成於該基材2之其中一侧面22的吸收膜6。該 { 光學薄膜具有一形成於該基材2之表面21的反射層3、一 形成於該反射層3與該基材2之間的緩衝層4及一疊置於 該反射層3的增反射層5。該吸收膜6是採用非有機材料。 該吸收膜6於可見光波段内的平均消光係數（exUncti〇n coefficient，簡稱！^值）是至少大於〇〇1，且該吸收膜6的非 有機材料是採用金屬材料或非金屬材料。 在本發明可減少迷光的光學鏡片之第一較佳實施例中 ，疋包含一吸收膜6。然而，在配合不同光機模組的幾何設 V 計需求下，舉例來說，當所處的光機模組所構成之環境光 源（圖未示）將自該等側面22入射至該基材2内以造成複數 反射路徑時，則本發明可減少迷光的光學鏡片亦可以是包 含兩形成於該等側面22的吸收膜6(圖未示）。 一般光機系統所使用之燈泡所產生的熱度可高達1〇5〇 C (視需求而定，亮度要求越高，燈泡温度相對也越高），進 而使得光機模組之運作環境的環境溫度也相對提高。為使 得本發明該吸收膜6不易因其光機模組之運作環境所構成 的環境溫度而產生揮發的問題，較佳地，該吸收膜6之非 200844473 有機材料於該光機模組之運作環境下的揮發溫度是至少大 於1000 C。更佳地，該吸收膜6之非有機材料於該光機模 組的運作環境下的揮發溫度是介於1〇5〇t：〜16〇(rc之間。 值得提的疋，適用於本發明該吸收膜6之非有機材料於 該光機模組之運作環境下的揮發溫度大小，主要是取決於 光機模組之機構設計所致的環境溫度；因此，本發明該吸 收膜6所使用之非有機材料於該光機模組之運作環境下的 揮發溫度並非僅侷限於前面所揭示的溫度範圍。 適用於本發明該基材2的每一側面22之長度與厚度是 刀別被定義為L及D。在光機模组的規格持續地朝向輕薄 短小化的趨勢之下，不僅設置於光機模組週邊的光學零組 件之體積需相對地縮小；此外，光學鏡片本身的體積規格 亦需相對下降。 值得一提的是，基於本發明該吸收膜6是經由蒸鍍 (evaporation)或濺鍍（sputtering)等物理氣相沉積法（pvD)形 成於該基材2之其中一侧面22的考量下，當L/d過大時， 那麼，該吸收膜6將因該基材2之側面22形狀過於狹長而 無法有效地彼覆於其所附著的側面22。另，為因應光學鏡 片的體積需符合小型化之要求，當該基材2側面22之D值 較小（例如：LI mm)，且L/D亦過小時，那麼，該吸收膜6 將因該基材2之側面22面積過小而無法有效地披覆於其所 附著的側面22。因此，適合於本發明的L/D是介於5〜4〇 之間；且在本發明該第一較佳實施例中，該基材2之側面 22的L及D分別是20 mm及1.1 mm(即，l/D約18)。 200844473 又值得一提的是，本發明該吸收膜6是藉由材料本身 的消光特性以吸收環境光源並降低光學鏡片的迷光現象。 因此’適合於本發明各較佳實施例之吸收膜6於可見光波 段内的平均k值是介於0·01〜2·8之間；較佳地，非金屬材 料是選自si、氧化不完全的Ti〇2或氧化不完全的Ta2〇5; 金屬材料是鎳鉻鐵(Ni-Cr-Fe)合金。 在該第一較佳實施例中，該吸收膜6是採用金屬材料 ’且特別是採用特定比例的Ni-Cr-Fe合金線，其中，Ni-Cr_ Fe合金線的製程環境壓力約3 〇χ1〇-3 pa〜9 〇χ1〇-4 pa，而 其揮發溫度約介於l30(TC〜140(rC之間，且合金線的細部紐 成之重量百分比為Ni(70%〜85%)、Cr(15%〜25%)、Fe(〇% 〜1.5%)、Si(0% 〜2%) ’ 及 Μη、C、Cu(0% 〜1%)，但不用 以限定本發明。 值得一提的是，本發明該吸收膜6的物理厚度不僅與 該基材2之側面22的L/D有關，此外，任何材料的k值將 因波長的變化而改變，因此，本發明該吸收膜6的物理厚 度亦決定於其本身所使用之材質的中心波長（人〇)及k值。本 發明該第一較佳實施例所使用之吸收膜（即，Ni-Cr_Fe合金 )6於可見光波段内的k值是簡單地整理於下列表丨沖。 表1· 波長 k值 I 400 2.2001 500 2.4691 600 2.7303 700 2.9301 1 以該吸收膜6所使用之材質的^及k值觀之，當該吸 10 200844473 收膜6於了見光波#又的k值越高時，該吸收膜6的物理厚 度越低；以Ni-Cr-Fe合金為例，當該吸收膜6的物理厚度 大於70 nm及小於15 nm時，該吸收膜6對於吸收環境光 源以降低迷光問題的貢獻度有限。以該基材2之側面22的 L/D觀之，當該吸收膜6的物理厚度大於15〇 時，亦將 使得該吸收膜6因膜厚過大而產生鍍膜剝離的問題。 因此，為使得該吸收膜6得以適度地吸收環境光源以 改善迷光問題，另，亦需符合信賴性的要求，較佳地，該 吸收膜6的物理厚度是介於15 nm〜15〇 nm之間；更佳地 ，該吸收膜6的物理厚度是介於15 nm〜7〇 nm之間。在該 第-較佳實施例中，是採用55G nm之中心波長(λϋ)作為該 吸收膜6之物理厚度的控制參數（即，k值約2·6)，且該第 一較佳實施例之吸收膜6的物理厚度是15〇 nm。 另，適用於本發明之反射層3可為Ag等具反射特性的 金屬材料；適用於本發明之緩衝層4是採用八丨2〇3或si〇2; 適用於本發明之增反射層5的膜層結構可2為 Al2〇3/Si〇2/(Ti〇2/Si〇2)2 ;在本發明該第一較佳實施例中， 該緩衝層4是採甩Μ"3 ;前揭反射層3、緩衝層4與增反 射層5非本發明之技術重點，因此，於此不再多加贅述之 〇 又值得一提的是，以於500 nm時的k值約為0.5734 ; 氧化不完全的Ti〇2於500 nm時的k值約為〇 〇1725 :氧化 不完全的Ta2〇5於5〇〇 nm時的k值約為〇 〇124 ;而前述說 明亦已提及’本發明該吸收m 6的物理厚度是決定於其本 11 200844473 身所使用之材貝的中心波長(入。)及k值，因此，本發明該吸 收膜6的物理厚度並非僅侷限於前面所界定的範圍，本發 明該吸收膜6的物理厚度亦可根據所使用的材質而調整。 再參閱圖2,本發明可減少迷光的光學鏡片之_第二較 么貝鈀例大致上是相同於該第一較佳實施例，其處 在於該吸收膜6的物理厚度為7〇nm。 、不门處 再參閱圖2,本發明可減少迷光的光學鏡片之_第三較 佳實施例，大致上是相同於該第一較佳實施例，其不同處 在於該吸收膜6的物理厚度為15nm。 參閱圖4,由本發明各較佳實施例之吸收膜ό的45度 角平均牙透率曲線比較圖顯示可知，本發明該等較佳實施 例之光機模組中的環境光源可藉由其光學鏡片的吸收膜6 所吸收，因而使得自其吸收膜6通過該基材2之環境光源 t平均穿透率下降至26%以下，因此，可有效地降低因環 境光源所致的迷光問題。 另，與習知解決迷光問題所使用之塗墨層等有機材料 相比較之下，本發明該光機模組内部之光學零組件在經過 長期的運作使用下，該等較佳實施例所使用之製程環境壓 力較面的吸收膜6等非有機材料，亦不易因環境溫度過高 而產生揮發問題，因此，亦可符合光機模組對於信賴性的 要求。 、 综上所述，本發明可減少迷光的光學鏡片不僅改善了 因環境光源所致的迷光問題’此外’亦使得光學鏡片得以 承受光機模組之環境溫度的考驗以符合信賴性的要求，確 12 200844473 實達到本發明之目的。 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。 【圖式簡單說明】 圖1是一正視示意圖，說明習知一種光學鏡片； 圖2是一正視示意圖，說明本發明可減少逑光的光學 鏡片之一第一較佳實施例； 圖3是該第一較佳實施例之側視示意圖；及 圖4是自本發明可減少迷光的光學鏡片之各較佳實施 例之吸收膜所取得的穿透率曲線圖。 13 200844473 【主要元件符號說明】 2 ..........基材 21 .........表面 22 ......…側面 3 ..........反射層 4 ..........緩衝層 5 ..........增反射層 6 ..........吸收膜 L..........側面的長度 D...........側面的厚度 14BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical lens, and more particularly to an optical lens capable of reducing stray light. [Prior Art] Referring to FIG. 1, an optical lens 1 includes a substrate U, a reflection-increasing film 12 formed on the substrate 11, a substrate 11 formed thereon, and the (reflection film 12). The reflective film 13 between the two, and a buffer film 14 formed between the reflective film 13 and the substrate 11. The optical lens 1 is generally according to the geometric design conditions of different 光pticai modules. The light machine module (not shown) is assembled in the light machine module, and the light source generated by an incident light source group (not shown) disposed inside the light machine module is matched with the optical lens 1 to provide the light machine. a specific reflection characteristic of the module. The light source generated by the incident light source group usually forms an ambient light source in the light machine module; however, the ambient light source further passes through the substrate of the optical lens 1 One side surface 15 of the U travels, and a plurality of reflection paths are formed in the substrate u, so that the ambient light source interferes with each other only inside the substrate 11 by the reflection paths and causes a problem of fogging, thereby affecting the optical machine. The overall operational quality of the module. In view of this, According to optical theory, if an object absorbs part of the visible light energy, it will weaken the light intensity and make the object appear a specific color. For example, if the light is not absorbed, the object is still transparent; if all the light is absorbed Then, the object is black. Therefore, in order to eliminate the problem of the above-mentioned fading, a common ink layer (not shown) of a tired color of 200844473 is formed on the end surface 15 of the substrate u as a matting substance, and black is used. The ink coating layer absorbs all visible light techniques to prevent the ambient light source from interfering with the normal performance of the optical lens j. "Furthermore, according to the theory, the absorption of light and the thickness of the shoulder light at a specific wavelength of light The concentration is related. When the thickness of the matting substance is thicker, the absorption of light is larger, and when the concentration of the matting substance is higher, the absorption amount of light is also larger. However, it should be noted that the premise is limited to the extinction substance. The specific / end degree | & circumference and is evenly and evenly covered on the surface of the object. If the concentration of the matting substance changes, or dissociation, polymerization, etc., it will not be possible. The ideal effect of preventing the interference of the ambient light source. Therefore, in the conventional technique of using the ink-coated layer as a matting substance, under the premise that the concentration range of the ink-coated layer and the uniformity and flatness of the coating layer cannot be accurately grasped, Whether the uniformity of the ink coating layer of the substrate end face 15 and the scattering or multiple reflection of the light wave on the surface of the uneven ink layer further affect the operation quality of the optomechanical module. In addition, the ambient temperature generated during the operation of the optomechanical module will also cause the ink layer of the U-face of the substrate to volatilize. After a long period of operation, the ink-coated layer of the substrate end face 15 is reduced. The contribution of the faint problem will also drop drastically due to the inability to meet the requirements of reliability. Therefore, the problem of the optical lens caused by the ambient light source is improved, and the optical lens can withstand the ambient temperature of the optomechanical module. The test to meet the requirements of reliability, and thus increase the operational quality of the optical module, is currently a topic to be solved in the field of optical lens development. Field [Summary Content] 200844473 Therefore, it is an object of the present invention to provide an optical lens which can reduce stray. Thus, the present invention is capable of reducing a lost optical lens, and is used in a light-emitting device module comprising: a substrate having two oppositely disposed surfaces and a plurality of sides connecting the surfaces, wherein a substrate is formed in the substrate A reflective layer of a surface is formed between the reflective layer and the buffer layer of the substrate, and at least one of the absorber films formed on one of the sides of the substrate. The absorbing film is made of a non-organic material. The average extinction coefficient of the absorbing film in the visible light band is > greater than 0.01 ′ and the non-organic material of the absorbing film is a metal material or a non-metal material. In addition, the present invention also provides an optical lens capable of reducing fogging, which is used in a light machine core group, comprising: a substrate having two oppositely disposed surfaces and at least one side surface connecting the surfaces, a light-preventing film on one of the surfaces of the substrate, and at least one absorbing film formed on the side of the substrate. The absorbing film is made of a non-organic material, and the absorbing film has an average extinction coefficient in the visible light band. The invention has the advantages of improving the glare problem caused by the influence of the ambient light source, and also ensuring that the optical lens can withstand the environmental temperature of the optomechanical module to meet the reliability. The requirements 'in turn increase the operational quality of the optomechanical module. [Embodiment] The foregoing and other technical contents, features, and advantages of the present invention are clearly described in the following detailed description of the three preferred embodiments of the reference drawings, before the invention is described in detail. It is to be noted that in the following description, like elements are denoted by the same reference numerals. Referring to FIG. 2 and FIG. 3, a first preferred embodiment of the present invention for reducing a lost optical lens is used in an optical module (not shown), comprising: a surface 21 having opposite arrangements and A substrate 2 connecting the side faces 22 of the surfaces 21, an optical film formed on one of the surfaces 21 of the substrate 2, and at least one absorbing film 6 formed on one of the side faces 22 of the substrate 2. The {optical film has a reflective layer 3 formed on the surface 21 of the substrate 2, a buffer layer 4 formed between the reflective layer 3 and the substrate 2, and a reflection enhancement stacked on the reflective layer 3. Layer 5. The absorbing film 6 is made of a non-organic material. The average extinction coefficient (exuncitation coefficient) of the absorbing film 6 in the visible light band is at least larger than 〇〇1, and the non-organic material of the absorbing film 6 is made of a metal material or a non-metal material. In a first preferred embodiment of the present invention, which reduces the loss of the optical lens, the crucible comprises an absorbing film 6. However, in combination with the geometrical requirements of different optomechanical modules, for example, an ambient light source (not shown) formed by the optomechanical module will be incident on the substrate from the sides 22 In the case where the complex reflection path is caused in the second embodiment, the optical lens which can reduce the fogging in the present invention may also include two absorbing films 6 (not shown) formed on the side faces 22. Generally, the light bulb used in the optomechanical system can generate up to 1〇5〇C (depending on the demand, the higher the brightness requirement, the higher the bulb temperature), and the ambient temperature of the operating environment of the optomechanical module. Also relatively improved. In order to make the absorbing film 6 of the present invention difficult to volatilize due to the ambient temperature of the operating environment of the optomechanical module, preferably, the non-200844473 organic material of the absorbing film 6 operates in the optomechanical module. The volatilization temperature in the environment is at least greater than 1000 C. More preferably, the non-organic material of the absorbing film 6 has a volatilization temperature of between 1 〇 5 〇 t: 〜 16 〇 (rc) in the operating environment of the optomechanical module. The volatilization temperature of the non-organic material of the absorbing film 6 in the operating environment of the optomechanical module is mainly determined by the ambient temperature caused by the mechanism design of the optomechanical module; therefore, the absorbing film 6 of the present invention The volatilization temperature of the non-organic material used in the operating environment of the optomechanical module is not limited to the temperature range disclosed above. The length and thickness of each side 22 of the substrate 2 suitable for use in the present invention are Defined as L and D. Under the trend that the specifications of the optomechanical module continue to be light and thin, not only the volume of the optical components disposed around the optomechanical module needs to be relatively reduced; in addition, the volume of the optical lens itself The specification also needs to be relatively decreased. It is worth mentioning that the absorbing film 6 is formed on the substrate 2 by physical vapor deposition (pvD) such as evaporation or sputtering according to the present invention. Under the consideration of side 22, When the L/d is too large, the absorbing film 6 will not be able to effectively cover the side surface 22 to which the side surface 22 of the substrate 2 is too narrow, and the size of the optical lens is required to be small. The requirement that when the D value of the side surface 22 of the substrate 2 is small (for example, LI mm) and the L/D is also too small, the absorption film 6 will not be effective because the area of the side surface 22 of the substrate 2 is too small. Covering the side 22 to which it is attached. Therefore, the L/D suitable for the present invention is between 5 and 4 Å; and in the first preferred embodiment of the invention, the side of the substrate 2 L and D of 22 are 20 mm and 1.1 mm, respectively (ie, l/D is about 18.) 200844473 It is also worth mentioning that the absorbing film 6 of the present invention absorbs the ambient light source by the extinction property of the material itself and reduces The glare phenomenon of the optical lens. Therefore, the average k value of the absorbing film 6 suitable for the preferred embodiments of the present invention in the visible light band is between 0·01 and 2·8; preferably, the non-metallic material is It is selected from the group consisting of Si, incompletely oxidized Ti〇2 or incompletely oxidized Ta2〇5; the metal material is a nickel-chromium-iron (Ni-Cr-Fe) alloy. In a preferred embodiment, the absorbing film 6 is made of a metal material', and particularly a Ni-Cr-Fe alloy wire of a specific ratio, wherein the process environment pressure of the Ni-Cr_Fe alloy wire is about 3 〇χ1〇-3. Pa~9 〇χ1〇-4 pa, and its volatilization temperature is about l30 (TC~140 (rC, and the weight percentage of the alloy wire is Ni (70%~85%), Cr(15 %~25%), Fe(〇%~1.5%), Si(0%~2%)' and Μη, C, Cu (0%~1%), but need not limit the invention. The physical thickness of the absorbing film 6 of the present invention is not only related to the L/D of the side surface 22 of the substrate 2, but also the k value of any material will vary due to the change in wavelength, and therefore, the physics of the absorbing film 6 of the present invention The thickness is also determined by the center wavelength (human 〇) and k value of the material used by itself. The k value of the absorbing film (i.e., Ni-Cr_Fe alloy) 6 used in the first preferred embodiment of the present invention in the visible light band is simply summarized in the following table. Table 1· Wavelength k value I 400 2.2001 500 2.4691 600 2.7303 700 2.9301 1 Take the value of the material and the k value of the material used in the absorption film 6, when the suction 10 200844473 film 6 is in the light value of seeing the light wave The higher the physical thickness of the absorbing film 6 is, the lower the physical thickness of the absorbing film 6 is. For example, when the physical thickness of the absorbing film 6 is greater than 70 nm and less than 15 nm, the absorbing film 6 is lowered for absorbing the ambient light source. The contribution of the low-light problem is limited. With respect to the L/D of the side surface 22 of the substrate 2, when the physical thickness of the absorbing film 6 is more than 15 Å, the absorbing film 6 is also caused to have a problem that the coating film is peeled off due to an excessive film thickness. Therefore, in order to make the absorption film 6 moderately absorb the ambient light source to improve the problem of glare, it is also required to meet the reliability requirement. Preferably, the physical thickness of the absorbing film 6 is between 15 nm and 15 〇 nm. More preferably, the physical thickness of the absorbing film 6 is between 15 nm and 7 〇 nm. In the first preferred embodiment, the center wavelength (λϋ) of 55G nm is used as the control parameter of the physical thickness of the absorbing film 6 (ie, the k value is about 2.6), and the first preferred embodiment The physical thickness of the absorbing film 6 is 15 〇 nm. In addition, the reflective layer 3 suitable for use in the present invention may be a metal material having reflective properties such as Ag; the buffer layer 4 suitable for use in the present invention is an octagonal 2 〇 3 or si 〇 2; a reflective layer 5 suitable for use in the present invention. The film structure 2 may be Al2〇3/Si〇2/(Ti〇2/Si〇2)2; in the first preferred embodiment of the invention, the buffer layer 4 is 甩Μ"3; The anti-reflection layer 3, the buffer layer 4 and the reflection-enhancing layer 5 are not the technical focus of the present invention. Therefore, it is not mentioned here. It is worth mentioning that the k value at 500 nm is about 0.5734; oxidation The incomplete Ti〇2 has a k value of about 〇〇1725 at 500 nm: the incompletely oxidized Ta2〇5 has a k value of about 〇〇124 at 5〇〇nm; and the above description also mentions The physical thickness of the absorption m 6 is determined by the center wavelength (in.) and the k value of the material used in the body of the present invention. Therefore, the physical thickness of the absorption film 6 of the present invention is not limited to the above. The physical thickness of the absorbing film 6 of the present invention can also be adjusted depending on the material used. Referring again to Figure 2, the second embodiment of the present invention which is capable of reducing the loss of the optical lens is substantially identical to the first preferred embodiment in that the physical thickness of the absorbing film 6 is 7 〇 nm. Referring to FIG. 2 again, the present invention can reduce the lost optical lens. The third preferred embodiment is substantially the same as the first preferred embodiment except that the physical thickness of the absorbing film 6 is different. It is 15 nm. Referring to FIG. 4, a 45 degree angular average tooth permeability curve comparison chart of the absorbent film of the preferred embodiments of the present invention shows that the ambient light source in the optomechanical module of the preferred embodiment of the present invention can be used by The absorption film 6 of the optical lens is absorbed, so that the average transmittance of the ambient light source t from the absorption film 6 through the substrate 2 is reduced to 26% or less, and therefore, the problem of fogging due to the ambient light source can be effectively reduced. In addition, the optical components inside the optomechanical module of the present invention are used under long-term operation, and the preferred embodiments are used in comparison with an organic material such as an ink coating layer used to solve the problem of fading. The non-organic materials such as the absorption film 6 whose surface pressure is relatively high in the process environment are also not easily caused by the excessive temperature of the environment, so that the reliability of the optomechanical module can be met. In summary, the present invention can reduce the obscuring optical lens not only improves the problem of glare caused by the ambient light source, but also enables the optical lens to withstand the environmental temperature of the optomechanical module to meet the reliability requirement. Indeed 12 200844473 achieves the purpose of the present invention. The above-mentioned ones are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention, All remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front elevational view showing a conventional optical lens; FIG. 2 is a front elevational view showing a first preferred embodiment of the optical lens of the present invention which can reduce calendering; FIG. A side view of the first preferred embodiment; and FIG. 4 is a graph of the transmittance obtained from the absorbent film of each of the preferred embodiments of the optical lens of the present invention. 13 200844473 [Explanation of main component symbols] 2 .......... Substrate 21 ......... Surface 22 ......... Side 3 ........ ..reflecting layer 4 ..... buffer layer 5 ..... streaking layer 6 ..... absorption film L..... ..... length of the side D........... thickness of the side 14