200811479 九、發明說明： 、 【發明所屬之技術領域】 本發明係關於一種於稜鏡面上逕設以微透鏡之光學薄膜。 【先前技術】 如第1圖所示者為習知之光學薄膜，係包括一棱鏡層（p)排列、連設於 一基層（B)之上，藉稜鏡之結構以達成所需之光學特性，唯此種習知之光 φ 學薄膜如欲增加其光軸之亮度（on-axisbrightness)，必須在稜鏡之角度，方 向性等因素上加以設計、變化，添增製作上之複雜度與成本，若另輔以導 光裝置將光導向光軸之方向，則亦會增加相關元件之安裝、體積與成本。 從來未f有人嚐試在棱鏡之稜鏡面上直接加設導光之構造，本案發明 人首先發明此一直接、價廉而又有效地將稜鏡面再設以微透鏡使出光導 向、趨近於光軸增加光軸亮度之光學薄膜。 【發明内容】 本發明之目的旨在提供一種於稜鏡面上逕設以微透鏡之光學薄膜，係 包括：一透明基層；以及一稜鏡層含有多數稜鏡者，係連設於該透明基層 上；其特徵為該稜鏡之稜鏡面上係連設有多數微透鏡(micnWens)，俾令 透經棱鏡面之投射光經由各該微透鏡之折射使其出射光方向更趨近於光 軸(on-axis)，而能增加光學薄膜之光軸亮度者。 本發明之可取實體可由以下說明書配合所附諸圖式而得以明晰之 200811479 【實施方式】 參閱第2，3，4圖，本發明光學薄膜係包括：一透明基層（1);以及一 稜鏡層(2)連設於該基層（1)之上，係包括有多數稜鏡並列設置於該基層 (1)上者；各稜鏡(3)之稜鏡面(31，32)上係連設或一體成型連設多數微透鏡 (4，micor_lenses)含凸透鏡及凹透鏡者。 各微透鏡(4)之剖面可呈弧形、新圓形、半_彡卿狀，其底面係與棱 鏡面(31或32)呈共平面(copianar)者；亦即各該微透鏡(4)係自各該稜鏡面 (jl或32)之底面以背離稜鏡面之方向向外漸凸(c〇vex)至該微透鏡之反曲 點(I，Inflection point)為其頂點者。 該等微透鏡(4)宜一體成型地連設於各稜鏡之稜鏡面(31，32)上；且可 以模製或轉印之方式一體成型地將稜鏡(3)及微透鏡(4)整體地連設於該基 層⑴之上。 該透明基層（1)可製自熱塑型樹脂，包括：聚苯乙烯二甲酸酯(PET)、 聚碳酸酯(PC)等。 該稜鏡層(2)之稜鏡(3)及微透鏡(4)可製自感光型或光硬化型樹脂或熱 固型樹脂，包括UV硬化型樹脂(或uv膠)者。 當然，其他適當材料亦可加選擇、應用之，本發明並未加以限制。 為便於清晰解說，本發明之第4〜6圖僅揭示一微透鏡(4)連設於本發明 光學薄膜之稜鏡面(31)上。其實，本發明稜鏡面(31或32)上之微透鏡之形 200811479 狀、數目、排列方式等係未加限制者。 如第4圖所示，當入射光(L)於稜鏡⑶内投射至圖示左側之稜鏡面(31) 時’先舉第4圖中虛線所示之習知稜鏡未加設本發明之微透鏡(4)為例，在 第一界®點(P1)入射光(L)穿經稜鏡面(31)之第一界面點(ρι)，即偏離第一 法線(N1)以折射角(A)射出為第一出射光(L1)。 當加設本發明之微透鏡(4)時，入射光(L)穿透微透鏡至偏離反曲點⑴ 之上方第二界面點(p2)，即以偏離第二法線”2)以折射角射出為第二出 射光(L2) ’第二出射光(L2)顯然比第一出射光(L1)更趨向於光軸(X)，遂增 加了依此構成之光學薄膜之光軸亮度(〇n-axis 。 第二法線(N2)之晝法如下所述： 1 ·在微透鏡(4)第二界面點(P2)處，沿著微透鏡弧形面畫切線(T，tangential line) 〇 2·在切線(T)上，以正交於第二界面點(p2)畫一垂直線，此即構成第二法 線(N2) 〇 第一法線(N1)與第二法線(N2)分別自稜鏡或微透鏡(4)(彼等設定為 相同材料具有相同折射係數)出光之折射角⑷雖為相同，但第二出射光㈣ 以第一法線_為準縱同以之折射角折射出光，但因第二法線⑽） 已自第-法線(N1)偏向光軸(X)呈一偏斜角(A1)，故第二出射光(L2)當然比 第-出射光(L1)更為偏肖光軸(χ)方向，如是遂增加了光學薄膜之光轴亮 度’由此足以證明本發明於稜鏡面上設有微透鏡(4)之構造，乃使穿過設有 200811479 微透鏡之稜鏡φ之出射光比未設有微魏之習知賴更趨向於光轴而更 為增加光學薄膜之光軸亮度。 如上所述及第4圖所示者，為折射出光㈣之界面點㈣位於微透鏡⑷ 曲面反步點(I)之上方(或圖示之右方），此時出辄2)的確更能趨向光轴。 但右入射光(L)經微透鏡⑷射向第二界面點㈣彼恰與微透鏡曲面之 反曲點(I)吻合(即Ι=Ρ2)如第5圖所示者，此時第二出射光(L2)與未設有微 透鏡之第-出射光(L1)則呈平行方向，此時人射、出射光之方向對於光轴 亮度則無不良影響。 如第6圖所示，當入射光(L)自第二界面點㈣折射、出光時，該界面 點(P2)已在微透鏡反曲點①之下方或圖示之左方，此時第二出射光(L2)與 第一出射光(L1)相比較，較為偏離光軸(χ);、、所幸〃第二出射光(L2)仍射 入鄰近的稜鏡(3)裡，並不會發生光損失(Hghtl〇ss)之劣象。 綜上所述，本發明因於稜鏡之稜鏡面連設以微透鏡，乃增加了光軸亮 度而縱因邛伤入射光角度偏低時，仍會射入鄰近之稜鏡中而不會造成光 損失，整體而言，本發明增益了光學薄膜之光特性，尤其是增加了光軸亮 度，而優異、進步於習知技術。 本兔明可如第7圖所示者，將前述之微透鏡(4)修飾為微凹透鏡(知)係 自稜鏡(3)之稜鏡面(31 ’ 32)由凹(concave)而成，彼乃構成本發明之另一可 取實施例。 而上述微透鏡(4)亦可如第8圖所示以半圓柱形之微透鏡(物)方式並 200811479 列、連設於該稜鏡面(3i或32)上，且各微透鏡(4b)係平行於各稜鏡兩稜鏡 面(>1 j2)向上漸尖、會合之脊(稜)線(33)者，此亦形成本發明之又一可取 實施例。 本释明必要時亦可將設有微透鏡⑷战鏡(3)與未設有微透鏡之稜鏡 (3)交互地間隔開來有如第9圖所示者；或於稜鏡之—稜鏡面⑼設有微透 鏡⑷，但於另一稜鏡面㈤則未設以微透鏡，有如第1〇圖所示者。 本發明中該等微透鏡(4)之大小、形狀、高低、間距 ' 曲率於棱鏡上分 佈或排狀密度’制方式，連繫細斷式設置，料絲加限制者。 當然’稜鏡(3)與微透鏡(4)之折射率雖可為相同，但亦可為異同者，凡 此種種，本發明均未加以限制。· 本發明可於不違本發明之精神及料下作適當之修飾或改變。例如， 各稜鏡右王金字塔之錐體時，亦可於各錐體面上設以該等微透鏡，而變化 應用之。 【圖式簡單說明】 第1圖係習知之光學薄膜示意目。 第2圖係本發明之光學_示意圖。 第3圖係本發明之剖示圖。 第4圖顯示本個出光折射方向與習知者之—比較示意圖。 第5圖顯示本發明出光折射方㈣•㈣ 一比較示意圖。 200811479 第6圖顯示本發明出光折射方向與習知者之再一比較示意圖。 ♦ 第7圖為本發明另一實施例之剖示圖。 第8圖為本發明再一貫施例之不意圖。 第9圖係本發明自第3圖修飾之另一實施例示意圖。 第10圖係本發明自第3圖修飾之又一實施例示意圖。200811479 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to an optical film in which a microlens is disposed on a crucible surface. [Prior Art] As shown in Fig. 1, a conventional optical film includes a prism layer (p) array and is connected to a base layer (B) by a structure to achieve desired optical characteristics. In order to increase the brightness of the optical axis (on-axisbrightness), the film must be designed and changed in terms of angles, directionality, etc., adding complexity and cost to the production. If the light guide is used to direct the light to the direction of the optical axis, the installation, volume and cost of the relevant components will also increase. It has never been attempted to directly add a light guiding structure to the surface of the prism. The inventor of the present invention first invented this direct, inexpensive and effective way to reposition the surface with a microlens to direct the light and approach the light. An optical film in which the axis increases the brightness of the optical axis. SUMMARY OF THE INVENTION An object of the present invention is to provide an optical film having a microlens on a crucible surface, comprising: a transparent base layer; and a crucible layer containing a plurality of crucibles connected to the transparent base layer The upper surface of the crucible is provided with a plurality of microlenses (micnWens), so that the projection light passing through the prism surface is refracted through the microlenses to make the outgoing light direction closer to the optical axis. (on-axis), which can increase the brightness of the optical axis of the optical film. The preferred embodiment of the present invention can be clarified by the following description in conjunction with the accompanying drawings. 200811479 [Embodiment] Referring to Figures 2, 3 and 4, the optical film of the present invention comprises: a transparent base layer (1); The layer (2) is connected to the base layer (1) and includes a plurality of turns arranged side by side on the base layer (1); the top faces (31, 32) of the respective turns (3) are connected Or a plurality of microlenses (4, micor_lenses) including a convex lens and a concave lens. Each of the microlenses (4) may have a curved shape, a new circular shape, and a semi-circular shape, and the bottom surface thereof is coplanar with the prism surface (31 or 32); that is, each of the microlenses (4) The bottom surface of each of the kneading surfaces (jl or 32) is outwardly convex (c〇vex) away from the kneading surface to the apex of the inflection point (I, Inflection point) of the microlens. The microlenses (4) are preferably integrally formed on the sides (31, 32) of each of the crucibles; and the crucible (3) and the microlenses (4) can be integrally molded by molding or transfer. ) is integrally connected to the base layer (1). The transparent base layer (1) can be produced from a thermoplastic resin, including: polystyrene dicarboxylate (PET), polycarbonate (PC), and the like. The ruthenium layer (3) and the microlens (4) of the ruthenium layer (2) may be formed from a photosensitive or photocurable resin or a thermosetting resin, including a UV curable resin (or uv glue). Of course, other suitable materials may also be selected and applied, and the invention is not limited. For the sake of clarity, the fourth to sixth embodiments of the present invention only disclose that a microlens (4) is attached to the face (31) of the optical film of the present invention. In fact, the shape of the microlens on the facet (31 or 32) of the present invention is not limited thereto, such as the shape, number, arrangement, and the like. As shown in Fig. 4, when the incident light (L) is projected into the pupil plane (31) on the left side of the figure in the 稜鏡(3), the conventional method shown in the broken line in Fig. 4 is not added. Taking the microlens (4) as an example, the incident light (L) at the first boundary® point (P1) passes through the first interface point (ρι) of the pupil plane (31), that is, deviates from the first normal line (N1) to refract The angle (A) is emitted as the first outgoing light (L1). When the microlens (4) of the present invention is added, the incident light (L) penetrates the microlens to a second interface point (p2) above the inflection point (1), ie, deviates from the second normal "2). The angle is emitted as the second outgoing light (L2). The second outgoing light (L2) is obviously more toward the optical axis (X) than the first outgoing light (L1), and the optical axis brightness of the optical film thus formed is increased. 〇n-axis The second normal (N2) method is as follows: 1 • At the second interface point (P2) of the microlens (4), draw a tangent along the curved surface of the microlens (T, tangential line 〇2· On the tangent line (T), draw a vertical line orthogonal to the second interface point (p2), which constitutes the second normal line (N2) 〇 first normal line (N1) and second normal line (N2) Self-twisting or microlens (4) (they are set to have the same refractive index for the same material). The refraction angle (4) of the light is the same, but the second outgoing light (4) is the same as the first normal. The refraction angle refracts the light, but since the second normal (10) has a skew angle (A1) from the first normal line (N1) to the optical axis (X), the second outgoing light (L2) is of course better than the first - The outgoing light (L1) is more in the direction of the optical axis (χ), and if it is added, the light is added. The optical axis brightness of the film is 'sufficient' to prove that the present invention has a microlens (4) structure on the surface of the crucible, so that the light exiting through the 稜鏡φ with the 200811479 microlens is less than that of the micro-wei. Lai tends to the optical axis and increases the optical axis brightness of the optical film. As described above and in Fig. 4, the interface point (4) for refracting light (4) is located above the reverse step (I) of the microlens (4) surface (I) ( Or the right side of the figure), at this time, the exit 2) does tend to be more toward the optical axis. However, the right incident light (L) is incident on the second interface point (4) via the microlens (4) and the inflection point of the surface of the microlens ( I) anastomosis (ie Ι = Ρ 2) as shown in Fig. 5, at this time, the second outgoing light (L2) and the first-exit light (L1) not provided with the microlens are in a parallel direction, at this time, the human shot, The direction of the outgoing light has no adverse effect on the optical axis brightness. As shown in Fig. 6, when the incident light (L) is refracted and emitted from the second interface point (4), the interface point (P2) is already at the microlens inflection point. Below 1 or to the left of the figure, at this time, the second outgoing light (L2) is more deviated from the optical axis (χ) than the first outgoing light (L1); and, fortunately, the second outgoing light (L2) Still injecting into the adjacent cymbal (3), there is no inferior image of light loss (Hghtl〇ss). In summary, the present invention is increased by the addition of microlenses to the surface of the cymbal. When the optical axis brightness is low and the incident light angle is low, it will still enter the adjacent crucible without causing light loss. Overall, the present invention gains the optical characteristics of the optical film, especially increased. The optical axis brightness is excellent and progresses to the conventional technology. As shown in Fig. 7, the rabbit may modify the aforementioned microlens (4) into a micro concave lens (known) from the face of the 稜鏡 (3) (31 '32) is formed by a concave, which constitutes another preferred embodiment of the present invention. The microlens (4) may also be connected to the top surface (3i or 32) by a semi-cylindrical microlens (2008) as shown in FIG. 8, and each microlens (4b) It is also parallel to the two sides (>1 j2) which are upwardly tapered and meet the ridge (rib) line (33), which also forms a further preferred embodiment of the present invention. The present disclosure may also be provided with a microlens (4) mirror (3) and a crucible (3) not provided with a microlens to be alternately spaced as shown in Fig. 9; The mirror surface (9) is provided with a microlens (4), but the other surface (5) is not provided with a microlens, as shown in Fig. 1. In the present invention, the size, shape, height, and pitch of the microlenses (4) are determined by the method of "curvature distribution on the prism or density of the rows", and the filaments are arranged in a fine manner. Of course, the refractive indices of '稜鏡(3) and the microlens (4) may be the same, but they may be different. The present invention is not limited in any way. The invention may be suitably modified or altered without departing from the spirit and scope of the invention. For example, in the case of the pyramids of the right-handed pyramids, the microlenses may be provided on the respective pyramid faces, and the variations are applied. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic representation of a conventional optical film. Figure 2 is a schematic view of the optical image of the present invention. Figure 3 is a cross-sectional view of the present invention. Figure 4 shows a comparison of the direction of the light refraction and the conventional one. Fig. 5 is a view showing a comparative diagram of the light refraction side (4) and (4) of the present invention. 200811479 Figure 6 shows a further comparison of the direction of light refraction of the present invention with those of the prior art. ♦ Figure 7 is a cross-sectional view showing another embodiment of the present invention. Figure 8 is a schematic representation of a consistent embodiment of the invention. Figure 9 is a schematic view of another embodiment of the present invention modified from Figure 3. Figure 10 is a schematic view of still another embodiment of the present invention modified from Figure 3.
【主要元件符號說明】 1..….透明基層； 2……棱鏡； 31，32.... ..稜鏡面； 入射光； N；l，N2.. —法線， PI，P2.·· ...界面點； A1......偏斜角； 2...…稜鏡層； 4……微透鏡； 33……脊(稜)線； LI，L2……出射光； I......反曲點； A……折射角； 4a.·.·.·凹透鏡。[Description of main component symbols] 1...transparent base layer; 2...prism; 31,32.....稜鏡稜鏡; incident light; N;l,N2.. —normal, PI, P2.· · ... interface point; A1... skew angle; 2...稜鏡 layer; 4...microlens; 33...ridge (rib) line; LI,L2...exit light; I...recurve point; A...refraction angle; 4a.····· concave lens.