201245780 六、發明說明： 【發明所屬之技術領域】 本發明涉及光學膜和偏光太陽鏡。 【先前技術】 眾所周知的是偏光太陽鏡炎著偏振片，在偏振片的兩 面上使用相位差低的低相位差膜。作為該低相位差膜例如 使用三醋酸纖維素膜（稱為TAC膜）（參照日本專利公 公報特開2007 — 256544號）。 從減小相位差、抑制雙折射性的觀點出發，用澆鑄的 方式形成所述三醋酸_錢。料鑄的方式軸的三醋 酸纖維素膜的相位差雖然低，但厚度變薄，因此在把三醋 酸纖維素膜用於偏光太陽鏡的鏡片的情況下，通過把^ (例如三個）三醋酸纖維素膜重疊貼合在一起，使鏡 厚度足夠厚。 可是，如果如上所述的把多個三醋酸纖維素 :起，則如果貼合面未完全貼緊，則會產生光== 于等不利情況。因此，需要一邊保持高的貼合精度，一邊 2多個三醋酸齡細貼合在—起，但是這樣的工作非常 、力，很可此成為導致生產率降低的原因。 專利文獻1:曰本專利公開公報特開2〇〇7—256544號 【發明内容】 鑒於所述的問題，本發明的目的是提供—種光學膜和 使用该光學膜的減太陽鏡，所述光學膜可以容易且可靠 生產具有足夠的厚度，而且即使層疊在其他光學膜上 也不會損㈣其他光賴的光學魏，而且適合用於如偏 3/13 201245780 光太陽鏡的鏡片那樣需要—定厚度的偏光板等。 為了解决所述的問題，本發明提供一種光學膜，該光 學膜是通過擠出成形法製成的，厚度為ΙΟΟμηι以上500/im 以下，可見光線透射率為87%以上，霧度（1^汉值）為2% 以下，平面方向相位差值（面方向遲滯值XR〇值）為 200nm 以下’厚度方向相位差值（厚度方向遲滯值）（Rth值）為 400nm以下。 此外，所述光學膜的所謂的“厚度”意思是指平均厚 度。 此外，可見光線透射率意思是指按照ns R 31〇6標準 利用分光光度計測量到的可見光區域的透射率。 此外，所謂平面方向相位差值（R〇值）是用以下式子 求出的數值。 .Ro 值=(Ny —Nx) xd 此外，所謂厚度方向相位差值（Rth值）是用以下式子 求出的數值Rth。201245780 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to an optical film and polarized sunglasses. [Prior Art] It is known that polarized sunglasses illuminate a polarizing plate, and a low retardation film having a low phase difference is used on both sides of the polarizing plate. As the low retardation film, for example, a cellulose triacetate film (referred to as a TAC film) is used (refer to Japanese Patent Laid-Open Publication No. 2007-256544). The triacetic acid is formed by casting from the viewpoint of reducing the phase difference and suppressing the birefringence. Although the phase difference of the triacetate film of the shaft of the casting method is low, the thickness is thin, so in the case of using a cellulose triacetate film for a lens of polarized sunglasses, by using (for example, three) triacetic acid The cellulose membranes are laminated together to make the mirror thickness thick enough. However, if a plurality of cellulose triacetate are used as described above, if the bonding surface is not completely adhered, light== is disadvantageous. Therefore, it is necessary to closely bond two or more triacetin ages while maintaining a high bonding precision, but such work is very strong and strong, which may cause a decrease in productivity. Patent Document 1: Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. The film can be easily and reliably produced with sufficient thickness, and even if it is laminated on other optical films, it will not damage (4) other optical fibers, and is suitable for use in lenses such as 3/13 201245780 light sunglasses. Polarizers, etc. In order to solve the above problems, the present invention provides an optical film which is formed by an extrusion molding method, and has a thickness of ΙΟΟμηι or more and 500/IM or less, a visible light transmittance of 87% or more, and haze (1^). When the value is 2% or less, the plane direction retardation value (surface direction hysteresis value XR 〇 value) is 200 nm or less 'thickness direction phase difference value (thickness direction hysteresis value) (Rth value) is 400 nm or less. Further, the so-called "thickness" of the optical film means the average thickness. Further, the visible light transmittance means the transmittance in the visible light region measured by a spectrophotometer in accordance with the ns R 31〇6 standard. Further, the plane direction phase difference value (R〇 value) is a value obtained by the following equation. .Ro value = (Ny - Nx) xd Further, the thickness direction phase difference value (Rth value) is a value Rth obtained by the following equation.
Rth 值=((NX + Ny) /2 —Nz) xd 其中’NX是膜的快軸（進相軸）（與平面方向平行的 軸）的折射率，Ny歧的慢軸（遲相轴）（與平面方向平 打且與快軸垂直的軸）的折射率，Nz是在厚度方向（與平 面方向垂直的方向）上的膜的折射率，d是膜的厚产。 所述光學膜的厚度為漏叩以上·_以下，又在層疊 在比較薄的其他光學膜上使用的情況下（例如在用於偏光 太陽鏡的鏡片的情況下），_該光學膜可収有恰當 度。 '口 此外’所述光學膜的可見光線透射率為87%以上，因 4/13 201245780 此可以使足夠的可見光線透射過該基體材料膜，因此在作 =光太陽鏡的鏡肢用的纽T，W給賴者以暗的 感覺。此外’由於基體材料膜的霧度在2%以下，所以可以 抑制由透射蝴基雜制的光《成關_清晰度降 低因此在用於偏光太陽鏡的鏡片時，不會給佩戴者以模 才月的感Α &此’在作為偏光太陽鏡的鏡片使用的情況下， 該光學膜可以成為可見度（視認性）良好的鏡片。 此外，由於所述光學膜的平面方向相位差值在2〇〇nm 以下，厚度方向相位差值在400llm以下，所以即使層疊在 其他，學膜等上’也不會損害該其他絲膜的光學功能， 特別疋例如在作為偏光太陽鏡的鏡片層疊在偏光膜上使用 的情況下，不會降低該偏光膜的光學功能。 此外，3亥光學膜由於是通過撥出成形法形成的，所以 可以成為具有所述的光學功能、且具有足夠厚度的膜，此 外，其製造容易且可以可靠地進行製造，從而可以實現提 高生產率。 此外’該光學膜作為主體聚合物可以使用聚碳酸酯。 由此，可以容易且可靠地控制相位差值，可以容易且可靠 地製造該光學膜。 此外’該光學膜作為主體聚合物可以使用環烯烴共聚 物。由此’例如即使在把使用了該光學膜的薄片形成為以 三維的方式彎曲成的形狀的情況下，也可以容易且可靠地 控制相位差值。即，如上所述，在形成為以三維的方式彎 曲成的形狀的情況下，通過熱成形等對該光學膜外加熱量 和壓力’以環烯烴共聚物為主體聚合物的該光學膜由於起 因於熱量和壓力的相位差變化小，所以容易維持相位差 5/13 201245780 值’因此可以容易且可靠地控制相位差值 。因此，例如在 將μ光:膜用於偏光太陽鏡的鏡片的情況下，可以採用鏡 片具有三維彎曲形狀的結構，因此具有設計性優異、且無 損於光學功能的優點。 t此外，該光學膜作為主體聚合物可以使用丙烯醆樹 月曰。由此，泫光學膜的透明度高，可以發揮高水準的可 光透射率。 此外，較佳為該光學膜用於偏光太陽鏡的鏡片。因此， 利用絲賴可以使偏光太陽鏡的鏡>}厚度成為足夠的厚 度，並且不會損害偏光太陽鏡的偏光特性等光學功能。 β此外，為了解決所述的問題’本發明還提供一種偏光 太1%鏡，其具有包括如上所述的光學膜的鏡片。 該偏光太陽鏡的所述光學膜由於具有足夠的厚度，所 以可以使偏光太陽鏡的鏡片的厚度成為足夠的厚度。此 外’該光學膜的可見光線透射率為87%以上，霧度為2%以 下，平面方向相位差值為2〇〇nm以下，而且厚度方向相位 差值為_nm以下，所以不會使純太陽鏡的偏振片的偏 光特性等光學功能降低。 如以上說明的那樣，本發明的光學膜由於通過擠出成 形可以容易且可靠地製造，並且具有足夠的厚度，所以當 與其他光學膜貼合在-起使用時，可以得到足夠厚度的層 疊體，此外即使層疊在其他光學膜上也具有不易損害其^ 光學膜的光學功能的效果。 此外，如上所述，本發明的偏光太陽鏡的所述光學膜 由於通過擠出成形可以容易且可靠地製造，所以與以往那 樣的把多個三醋酸纖維素膜貼合在一起製造的太陽鏡相 6/13 201245780 Ϊ足且可靠地形成鏡片，此外，由於該光學膜具 有^的厚度，所以可以使鏡片的厚度成為足夠的厚度， 疊該光學膜，也射^财 特性等光學功能的效果。 η 【實施方式】 :面以基體材_ 2〇 (光學膜）為例，對本發明的實 「t?"行說明。如圖1所示，該基體材料㈣用於具有 =片Γ。安裝在該框架2上的—對鏡片3的偏光太陽鏡1 j基，材料膜2G通過擠出成形法而形成為薄片狀。具 二幾:使膜的材料熔融’把該熔融的膜的材 盆純U出，使被擠出的膜的材料冷卻形成為薄片狀。 ，、’根據膜的材料和後述的基體材繼2()的 疋擠出條件和成频内的樹脂溫料成形條件。 :卜’基雜料卿的厚度（平均厚度）設置成丨卿m 〇〇_以下’較佳為設置成200，以上30〇帅 如果小於所述下限值，職__ 2()變得比 ^ 3不能具有⑽的厚度。另—方面，如果大於所^ 限值，則難以得到後述的所希望的光學特性。 此外，基體材料膜20的可見光線透射率設置成87%以 上，較佳為設置成88%以上，更佳為設置成m以上 -步較佳狀置成9Q%以上。由於使基體材制如的可^ 光線透射率為所述下限值以上的可見光線透射率，使 體材料膜20可以透射過足夠的可見練，所以在用於偏二 太陽鏡1的鏡片3時，不易給佩戴者以暗的感覺。 7/13 201245780 此外，基體材料膜20的霧度設置成2%以下，較佳為 設置成】％以下。通過使基體材料膜20的霧度成為所述上 限值以下的霧度，可以抑制由透射過該基體材料膜2〇的光 線形成的圖像的清晰度降低，在用於偏光太陽鏡】的鏡片3 時，不會給佩戴者以模糊的感覺，可以成為可見度良好的 鏡片3。 ^ 此外，基體材料膜20的平面方向相位差值被設置成 200nm以下’較佳為設置成】50nm以下，更加為設置成5加出 以下’進-步較佳為是設置成2Gnm以下。此外，基體材料 膜20的厚度方向相位差值被設置成4〇〇nm以下，較佳為設 置成lOOnm以下，更佳為設置成8〇nm以下。由此，在^ 於偏光太陽鏡1的糾3時，不會損害絲域鏡 光特性。 在此，平面方向相位差值Ro是用下面的式子求出的數 值。Rth value = ((NX + Ny) /2 - Nz) xd where 'NX is the refractive index of the fast axis (phase axis) of the film (the axis parallel to the plane direction), and the slow axis of the Ny difference (late phase axis) The refractive index of the film (the axis which is flat with the plane direction and perpendicular to the fast axis), Nz is the refractive index of the film in the thickness direction (the direction perpendicular to the plane direction), and d is the film thickness. The thickness of the optical film is less than or equal to 叩 ,, and in the case of being laminated on a relatively thin other optical film (for example, in the case of a lens for polarized sunglasses), the optical film may be received Appropriate. The optical transmittance of the optical film of 'mouth is '87% or more, because 4/13 201245780 can transmit sufficient visible light to the film of the base material, so it is used as a mirror for the temple of light sunglasses. W gives the person a dark feeling. In addition, since the haze of the film of the base material is less than 2%, it is possible to suppress the light which is caused by the transmission of the base, and the brightness is reduced. Therefore, when the lens is used for polarized sunglasses, the wearer is not given a mold. The feeling of the month & this 'when used as a lens for polarized sunglasses, the optical film can be a lens with good visibility (visibility). Further, since the retardation phase difference value of the optical film is 2 〇〇 nm or less and the thickness direction retardation value is 400 lmm or less, even if laminated on another film, etc., the optical properties of the other silk film are not impaired. The function, in particular, for example, when a lens as polarized sunglasses is laminated on a polarizing film, the optical function of the polarizing film is not lowered. Further, since the 3H optical film is formed by the dial-out molding method, it can be a film having the above-described optical function and having a sufficient thickness, and is easy to manufacture and can be reliably manufactured, thereby achieving productivity improvement. . Further, the optical film may be a polycarbonate as a host polymer. Thereby, the phase difference value can be easily and reliably controlled, and the optical film can be easily and reliably manufactured. Further, the optical film as a host polymer may use a cyclic olefin copolymer. Thus, for example, even when the sheet using the optical film is formed into a shape that is curved in a three-dimensional manner, the phase difference value can be easily and reliably controlled. That is, as described above, in the case of forming a shape that is curved in a three-dimensional manner, the optical film is heated by the thermoforming or the like, and the optical film having the cyclic olefin copolymer as a host polymer is caused by Since the phase difference between heat and pressure changes little, it is easy to maintain the phase difference of 5/13 201245780 value' so that the phase difference value can be easily and reliably controlled. Therefore, for example, in the case where a μ light: film is used for a lens of polarized sunglasses, a structure in which the lens has a three-dimensional curved shape can be employed, and therefore, it is excellent in design and does not impair the optical function. Further, as the main film of the optical film, acryl eucalyptus can be used. Thereby, the 泫 optical film has high transparency and can exhibit a high level of light transmittance. Further, it is preferred that the optical film is used for a lens of polarized sunglasses. Therefore, the thickness of the mirror>} of the polarized sunglasses can be made thick enough without impairing the optical function such as the polarizing characteristics of the polarized sunglasses. Further, in order to solve the problem described, the present invention also provides a polarized too 1% mirror having a lens comprising the optical film as described above. Since the optical film of the polarized sunglasses has a sufficient thickness, the thickness of the lens of the polarized sunglasses can be made sufficiently thick. Further, the optical film has a visible light transmittance of 87% or more, a haze of 2% or less, a phase difference in the planar direction of 2 〇〇 nm or less, and a phase difference in the thickness direction of _nm or less, so that the optical film does not become pure. The optical function such as the polarizing characteristics of the polarizing plate of the sunglasses is lowered. As described above, since the optical film of the present invention can be easily and reliably produced by extrusion molding and has a sufficient thickness, when laminated with other optical films, a laminate having a sufficient thickness can be obtained. Further, even if it is laminated on another optical film, it has an effect of not easily impairing the optical function of the optical film. Further, as described above, since the optical film of the polarized sunglasses of the present invention can be easily and reliably produced by extrusion molding, the sunglasses phase 6 manufactured by laminating a plurality of cellulose triacetate films as in the related art is known. /13 201245780 The lens is formed satisfactorily and reliably. Further, since the optical film has a thickness of 2, the thickness of the lens can be made to have a sufficient thickness, and the optical film can be stacked to have an effect of an optical function such as a chemical property. η [Embodiment]: The surface is made of a base material _ 2 〇 (optical film), and the actual "t?" line of the present invention is described. As shown in Fig. 1, the base material (4) is used for having a sheet Γ. On the frame 2, the polarizing sunglasses of the lens 3 are made of a base material, and the material film 2G is formed into a sheet shape by extrusion molding. There are two: melting the material of the film 'pure the material of the molten film U is discharged, and the material of the film to be extruded is cooled to form a sheet. ", according to the material of the film and the base material of 2 (), which is described later, the extrusion conditions of the resin and the molding conditions of the resin in the frequency. The thickness (average thickness) of the Bu's material is set to 丨 m 〇〇 以下 _ _ _ is preferably set to 200, the above 30 〇 handsome if less than the lower limit, _ _ 2 () becomes ^3 cannot have a thickness of (10). On the other hand, if it is larger than the limit value, it is difficult to obtain desired optical characteristics to be described later. Further, the visible light transmittance of the base material film 20 is set to 87% or more, preferably It is set to 88% or more, more preferably set to m or more - the step is preferably set to 9Q% or more. If the light transmittance is higher than the lower limit of the visible light transmittance, the body material film 20 can be transmitted through sufficient visible practice, so when used for the lens 3 of the second sunglasses 1, it is difficult to give the wearer 7/13 201245780 The haze of the base material film 20 is set to 2% or less, preferably 5% or less. The haze of the base material film 20 is equal to or less than the upper limit value. The haze can suppress the decrease in the sharpness of the image formed by the light transmitted through the film 2 of the base material, and the lens 3 used for the polarized sunglasses does not give the wearer a blurring feeling, and can have good visibility. In addition, the phase difference value in the plane direction of the base material film 20 is set to 200 nm or less, preferably set to 50 nm or less, and more preferably set to 5, and the following steps are preferably set to Further, the thickness direction retardation value of the base material film 20 is set to 4 〇〇 nm or less, preferably set to 100 nm or less, more preferably set to 8 〇 nm or less. Thus, in the polarized sunglasses 1 when correcting 3, The spectral characteristics of the filament region are not impaired. Here, the plane direction phase difference value Ro is a value obtained by the following equation.
Ro= (Ny —Nx) xd 疋用下面的式子求出的 此外，厚度方向相位差值Rth 數值。Ro = (Ny - Nx) xd 求出 is obtained by the following equation. Further, the thickness direction phase difference value Rth value.
Rth= ((Nx + Ny) /2-Nz) xd 其中’Nx是基體材料膜2G的快軸（與平面方向平个 =軸^的折射率，Ny是基體材料膜2〇的慢軸（與平面2 且與快軸垂直的軸）的折料，他是基體材料膜2 的H向（與平面方向垂直的方向）上的基體材料膜2 的折射率，d是膜的厚度。 基雜_ 2G的玻魏觀溫度Tg較佳為言: C以上170C以下’更佳為設置成105ac以上】6 8/13 201245780 c以下’進-步較佳為設置成U(rc以上15叱以下。通過 採用這樣的玻璃化轉變溫度的範圍，在對基體材料膜2〇(以 及使用它的薄片）進行熱成形的情況下，可以容易且可靠 地進行成形’並且錢卿時容易轉所勒位差值。 此外’作為該基體材料膜2Q的主體聚合物，可以使用 聚碳酸S旨、環烯烴共聚物、丙烯酸樹脂等。此外，該基體 材料膜2 0根據目的不同可以添加有紫外線吸㈣、紫外線 穩定劑等各種添加材料。 —在此，作為主體聚合物通過使用聚碳酸酯，具有可以 谷易且可罪地控制相位差值的優點。 ^卜’作為主體聚合物通過使用環埽烴共聚物，在偏 光太陽1¾ 1的鏡片3具有以三維的方式彎曲成的形狀的情 況下（參照圖〇’可以防止該基體材料膜2G具有雙折射性。 即，在形成以三維的方式彎曲成的形狀的情況下，例如通 過熱成形等對基體材制2〇外加熱量和壓力，以環稀煙共 聚物作為主體聚合物的基體材料膜2G，起因於熱量和壓^ 的相位差變化小，因此容易維持所述相位差值。 _此外，作為主體聚合物通過使用丙烯酸樹脂，透明度 高，可以發揮高水準的可見光透射率。 又 下面參照圖2對偏光鏡片用薄片進行說明，該偏光鏡 片用薄片包括具有所述構成的基體材料膜2〇和在該基 料膜20上層疊的偏光膜30。 、在該圖2的偏光鏡片用薄片卜基體材料膜2〇層疊在 偏光膜30的兩面上。此外，基體材料膜2〇和偏光骐扣可 以通過各種方法黏貼在―起，例如可以通過黏接劑等層疊 黏貼在一起。此外，在使用黏接劑的情況下，較佳為^ 9/13 201245780 透明的黏接劑。 =偏?膜3。是被設置成做在—定方向上振動的光線 $射^的料狀構件。該偏光膜3G可以採用各種偏光膜 3〇’例如可以使用以聚乙稀醇為主體並使峨化合物分子吸 附定向m體上的偏光膜。其中，偏絲適合使用厚 度為50μιτι以上200μΓη以下的偏光膜。 此外’把該基崎制㈤層#在偏光膜％上的 不限於所賴結構，可輯用各種方式的結構，例如可以 採用圖3所示的結構。該圖3的偏光鏡片㈣片丨g是把該 基體材料膜2G層疊在多層結構的偏光膜％的單個面上: 此外，基體材料膜20、偏光膜30這兩個膜的黏貼方法等歲 所述說明過的相同。 ^ 該圖3所示的偏光膜3G具魏附定向有视合物分子 的聚乙稀醇層32 (偏光層）、設置在該聚乙稀醇層％的兩 面上的三醋酸纖維素膜層3卜33的三層結構，該基體材料 膜20層疊黏貼在一個三醋酸纖維素膜層幻的外側的面上。 如上所述，使用具有基體材料膜2〇和偏光膜3〇的偏 光鏡片用薄片〗0 ’形成-對鏡片3，把該—對鏡片3安裝 在框架2上’得到偏光太陽鏡卜此外，在想把鏡片3形成 為三維曲面形狀的情況下，在安裝到框架2上之前，通過 對偏光鏡片㈣>；10進行熱成形，可以形成為所希望形狀 的鏡片3。 該基體材料膜20由於所述構成可以如上所述那樣使 用，所以具有以下優點。即由於厚度為1〇〇μηι以上5〇〇μηι 以下，所以在用於偏光太陽鏡1的鏡片3時，利用該基體 材料膜20可以使鏡片3具有恰當的厚度。 10/ 13 201245780 此外，由於該基體材料膜2〇的可見光線透射率為87% 以上，霧度為2%以下，平面方向相位差值為2〇〇nm以下， 厚度方向相位差值為4G〇nm以下，所以即使作為偏光太陽 鏡的鏡片使用也不會使偏光太陽鏡的偏振片的光學功能降 低。 此外，該光學膜由於通過擠出成形法製作，所以如上 所述，可以具有足夠的厚度，並可以容易且可靠地製造。 即，與以往的把三醋酸纖維素膜層疊為多層的情況相比， 本發明的光學膜的製造容易且可靠。而且，該基體材料膜 20作為主體聚合物可以使用聚碳酸酯、環烯烴共聚物或丙 晞酸樹脂。這些材料可以容fjL可靠地製造所述構成 的基體材料薄片。 此外，所述實施方式具有所述的構成，並具有所述的 優點，但本發明不限於此，在本發明的目的範圍内可以適 當變更設計。 即，對作為所述實施方式的鏡片用薄片包括作為基體 材料臈的所述光學膜以及偏光膜的結構進行了說明，但也 可以採用其他的結構。例如也可以適當變更設計，在該光 學骐（基體材料膜）和偏光膜之間設置其他層。具體地說， 可以從觀察者一側順序層疊偏光膜、紫外線吸收層等紫外 線防止層和該光學膜。此外也可以適當變更設計，在該光 學膜和/或偏光膜的外側的面上設置保護層、紫外線防止層 等其他層。 μ 曰 工業實用性 、,如上所述，本發明的光學膜的可見光透射率高，霧度、 平面方向相位差值和厚度方向相位差值小，因此即使層"疊 201245780 在其他光賴上也;^會損害該其他光學賴光學特性，可 以具有足觸厚度’例如可以適合用於偏光太陽躺鏡片。 【圖式簡單說明】 圖1表示本發明-㈣财式的料域鏡的立體圖 圖2是用於圖1 片的簡要剖視圖。 的偏光太陽鏡的鏡片的偏光鏡片用薄 偏光太陽鏡的鏡片 圖3是本發明其他實施方式的用於 的偏光鏡片用薄片的簡要剖視圖。 【主要元件符號說明】 1 偏光太陽鏡 2 框架 3 鏡片 1〇偏光鏡片用薄片 20基體材料膜 30偏光膜 31三醋酸纖維素膜層 32聚乙烯醇層 33三醋酸纖維素膜層 12/13Rth=((Nx + Ny) /2-Nz) xd where 'Nx is the fast axis of the base material film 2G (the refractive index is flat with the plane direction = axis ^, and Ny is the slow axis of the base material film 2〇 (with The refractive index of the plane 2 and the axis perpendicular to the fast axis is the refractive index of the base material film 2 in the H direction (the direction perpendicular to the plane direction) of the base material film 2, and d is the thickness of the film. 2G's glass-view temperature Tg is better: C above 170C or less 'more preferably set to 105ac or more】 6 8/13 201245780 c below 'step-step is preferably set to U (rc above 15叱). With such a range of the glass transition temperature, in the case of thermoforming the base material film 2 (and the sheet using the same), the forming can be easily and reliably performed, and the difference in the position of the money is easy to change. Further, as the main polymer of the base material film 2Q, a polycarbonate S, a cyclic olefin copolymer, an acrylic resin, or the like can be used. Further, the base film 20 can be added with ultraviolet light (four) depending on the purpose, and the ultraviolet ray is stable. Various additives such as agents. - Here, as a host polymerization By using polycarbonate, there is an advantage that the phase difference can be controlled easily and sinfully. ^B' as a host polymer by using a cyclic anthracene hydrocarbon copolymer, the lens 3 in a polarized sun 13⁄4 1 has a three-dimensional bending In the case of the shape (see FIG. 2), the base material film 2G can be prevented from having birefringence. That is, in the case of forming a shape that is three-dimensionally bent, the base material is made, for example, by thermoforming. The amount of external heating and the pressure, the base material film 2G having the ring-smoke-smoke copolymer as the main polymer, is small in variation in phase difference due to heat and pressure, and thus it is easy to maintain the phase difference value. The acrylic resin is used, and the transparency is high, and a high level of visible light transmittance can be exhibited. The sheet for a polarizing lens will be described below with reference to FIG. 2, and the sheet for a polarizing lens includes the base material film 2 having the above configuration and the base material. The polarizing film 30 laminated on the film 20 is laminated on both surfaces of the polarizing film 30 in the substrate 2 for polarizing film of the polarizing lens of Fig. 2 . The base material film 2 偏 and the polarizing 骐 buckle can be adhered to each other by various methods, for example, by laminating and bonding together by an adhesive, etc. Further, in the case of using an adhesive, it is preferably 9 9/13 201245780 transparent The adhesive agent is a material member that is arranged to be oscillated in a certain direction. The polarizing film 3G can be used with various polarizing films 3 〇 'for example, it can be used for polyethylene. The dilute alcohol is the main component and the ruthenium compound molecules are adsorbed to the polarizing film on the oriented m body. Among them, the polarizing film is suitable for using a polarizing film having a thickness of 50 μm or more and 200 μΓη or less. Further, 'the base layer (5) layer # is on the polarizing film% The structure is not limited to the structure, and various structures can be used. For example, the structure shown in FIG. 3 can be employed. The polarizing lens (four) sheet 丨g of FIG. 3 is obtained by laminating the base material film 2G on a single surface of the polarizing film % of the multilayer structure: In addition, the bonding method of the two films of the base material film 20 and the polarizing film 30 is the same as that of the film. The same is stated. The polarizing film 3G shown in FIG. 3 has a polyethylene glycol layer 32 (polarizing layer) with a target molecule, and a cellulose triacetate film layer disposed on both sides of the polyethylene layer. The three-layer structure of 3b 33, the base material film 20 is laminated and adhered to the outer surface of a triacetate film layer. As described above, the polarizing lens sheet having the base material film 2〇 and the polarizing film 3〇 is formed to form the pair of lenses 3, and the pair of lenses 3 are attached to the frame 2 to obtain polarized sunglasses. In the case where the lens 3 is formed into a three-dimensional curved shape, the lens 3 of a desired shape can be formed by thermoforming the polarizing lens (4) > 10 before being attached to the frame 2. Since the above-described structure can be used as described above, the base material film 20 has the following advantages. That is, since the thickness is 1 〇〇μηι or more and 5 〇〇μηι or less, the lens 3 can have an appropriate thickness by the base material film 20 when used for the lens 3 of the polarized sunglasses 1. 10/ 13 201245780 In addition, since the visible light transmittance of the base material film 2〇 is 87% or more, the haze is 2% or less, the phase difference in the plane direction is 2 〇〇 nm or less, and the phase difference in the thickness direction is 4 〇. Below nm, even if it is used as a lens for polarized sunglasses, the optical function of the polarizing plate of polarized sunglasses is not lowered. Further, since the optical film is produced by an extrusion molding method, as described above, it can have a sufficient thickness and can be easily and reliably produced. That is, the production of the optical film of the present invention is easier and more reliable than the case of laminating a cellulose triacetate film into a plurality of layers. Further, as the host polymer, the base material film 20 may be a polycarbonate, a cyclic olefin copolymer or a acryl resin. These materials can reliably produce the formed base material sheet by fjL. Further, the embodiment has the above-described configuration and has the above-described advantages, but the present invention is not limited thereto, and the design can be appropriately changed within the scope of the object of the present invention. That is, the configuration of the optical film and the polarizing film as the base material 臈 as the lens sheet of the above embodiment has been described, but other configurations may be employed. For example, the design may be appropriately changed, and another layer may be provided between the optical raft (base material film) and the polarizing film. Specifically, an ultraviolet ray preventing layer such as a polarizing film or an ultraviolet absorbing layer and the optical film may be laminated in this order from the observer side. Further, the design may be appropriately changed, and other layers such as a protective layer and an ultraviolet ray preventing layer may be provided on the outer surface of the optical film and/or the polarizing film. μ 曰 industrial applicability, as described above, the optical film of the present invention has high visible light transmittance, and the haze, the phase difference in the plane direction, and the phase difference in the thickness direction are small, so even if the layer "stack 201245780 is on other ray Also, it may damage the other optical optical properties, and may have a full-thickness thickness, for example, which may be suitable for use in a polarized solar lens. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a range mirror of the present invention - (4). Fig. 2 is a schematic cross-sectional view of the sheet for Fig. 1. 3 is a lens for a polarizing lens for a polarizing lens of a polarized sunglasses. Fig. 3 is a schematic cross-sectional view of a sheet for a polarizing lens used in another embodiment of the present invention. [Main component symbol description] 1 Polarized sunglasses 2 Frame 3 Lens 1 〇 Polarized lens sheet 20 Base material film 30 Polarized film 31 Triacetyl cellulose film layer 32 Polyvinyl alcohol layer 33 Triacetyl cellulose film layer 12/13