JP7212507B2 - UV illuminance evaluation method, UV illuminance evaluation device, and UV irradiation device - Google Patents

UV illuminance evaluation method, UV illuminance evaluation device, and UV irradiation device Download PDF

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JP7212507B2
JP7212507B2 JP2018226705A JP2018226705A JP7212507B2 JP 7212507 B2 JP7212507 B2 JP 7212507B2 JP 2018226705 A JP2018226705 A JP 2018226705A JP 2018226705 A JP2018226705 A JP 2018226705A JP 7212507 B2 JP7212507 B2 JP 7212507B2
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ultraviolet
illuminance
optical film
irradiator
ultraviolet rays
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JP2020091124A (en
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龍一 井上
大地 植敷
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Nitto Denko Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/429—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to measurement of ultraviolet light

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Description

本発明は、長手方向に搬送される光学フィルムに向けて紫外線照射器から照射される紫外線の照度を評価する紫外線照度評価方法、紫外線照度評価装置、及びこの紫外線照度評価装置を備える紫外線照射装置に関する。特に、本発明は、光学フィルムに塗工された紫外線硬化型接着剤を硬化させるのに十分な紫外線の照度が得られているか否かを適切に評価可能な紫外線照度評価方法、紫外線照度評価装置、及び紫外線照射装置に関する。 The present invention relates to an ultraviolet irradiance evaluation method, an ultraviolet irradiance evaluation apparatus, and an ultraviolet irradiator equipped with this ultraviolet irradiance evaluation apparatus for evaluating the illuminance of ultraviolet rays emitted from an ultraviolet irradiator toward an optical film transported in the longitudinal direction. . In particular, the present invention provides an ultraviolet illuminance evaluation method and an ultraviolet illuminance evaluation apparatus capable of appropriately evaluating whether or not sufficient ultraviolet illuminance is obtained to cure an ultraviolet curable adhesive applied to an optical film. , and an ultraviolet irradiation device.

従来、光学フィルムは、液晶表示装置や有機ＥＬ表示装置等の画像表示装置等に用いられている。光学フィルムとしては、例えば、偏光フィルム（偏光子）、偏光フィルムを含む偏光板、位相差フィルム、アンチグレアフィルム等が挙げられる。
光学フィルムは、通常、長尺帯状の原反フィルムを用いて製造される。原反フィルムを搬送設備で長手方向に搬送しながら、順次各種の処理を施すことで、製品としての長尺帯状の光学フィルムが製造される。長尺帯状の光学フィルムは、用途に応じたサイズに切断され、画像表示装置等に用いられる。
以下、本明細書では、製品としての光学フィルムのみならず、原反フィルム及び中間製品のフィルムも含めて光学フィルムと称する。 2. Description of the Related Art Conventionally, optical films have been used in image display devices such as liquid crystal display devices and organic EL display devices. Examples of optical films include polarizing films (polarizers), polarizing plates including polarizing films, retardation films, and antiglare films.
An optical film is usually manufactured using a long belt-shaped raw film. A long belt-shaped optical film as a product is manufactured by successively performing various treatments while transporting the raw film in the longitudinal direction by transport equipment. A long strip-shaped optical film is cut into a size according to the application and used for an image display device or the like.
Hereinafter, in the present specification, the optical film includes not only the optical film as the product, but also the original film and the film of the intermediate product.

例えば、偏光フィルムの場合、偏光フィルムの片面又は両面に保護フィルムを積層することがある。偏光フィルムに保護フィルムを積層する方法として、予め保護フィルムの表面に紫外線硬化型接着剤を塗工した後、偏光フィルムと保護フィルムとを貼り合わせローラ（ニップローラ）で挟圧して貼り合わせ、次いで紫外線照射装置から紫外線を照射することで接着剤を硬化させる方法が知られている（例えば、特許文献１参照）。
なお、特許文献１に記載の方法では、予め保護フィルムの表面に紫外線硬化型接着剤を塗工しているが、予め偏光フィルムの表面に紫外線硬化型接着剤を塗工する場合や、保護フィルム及び偏光フィルムの双方の表面に紫外線硬化型接着剤を塗工する場合もある。 For example, in the case of a polarizing film, a protective film may be laminated on one or both sides of the polarizing film. As a method of laminating a protective film on a polarizing film, an ultraviolet curable adhesive is applied to the surface of the protective film in advance, and then the polarizing film and the protective film are laminated by pressing with a laminating roller (nip roller). A method of curing an adhesive by irradiating ultraviolet rays from an irradiation device is known (see, for example, Patent Document 1).
In the method described in Patent Document 1, the UV-curable adhesive is applied to the surface of the protective film in advance. and the polarizing film may be coated with an ultraviolet curable adhesive.

偏光フィルムと保護フィルムとの十分な接着性を確保するには、照射する紫外線の照度を一定以上に維持し、紫外線硬化型接着剤を確実に硬化させることが必要である。このため、従来、紫外線照射装置から照射される紫外線の照度を適宜のタイミングで測定・評価し、紫外線照度が一定以上となるように管理している。 In order to ensure sufficient adhesiveness between the polarizing film and the protective film, it is necessary to maintain the illuminance of the ultraviolet rays to be irradiated at a certain level or higher and to cure the ultraviolet curing adhesive reliably. For this reason, conventionally, the illuminance of ultraviolet rays emitted from an ultraviolet irradiation device is measured and evaluated at appropriate timings, and managed so that the ultraviolet illuminance is above a certain level.

しかしながら、従来の紫外線照度の評価方法は、紫外線照射装置からの紫外線の照射領域に紫外線照度計を配置し、その配置位置を適宜変更しながら測定した照度の最大値（ピーク照度）の大小で評価するものであった。このため、紫外線硬化型接着剤を硬化させるのに十分な紫外線の照度が得られているか否かを適切に評価できない場合があった。 However, the conventional method for evaluating UV illuminance is to place an UV illuminometer in the area irradiated with UV rays from the UV irradiation device, and evaluate the maximum illuminance value (peak illuminance) measured while changing the placement position as appropriate. It was something to do. For this reason, it may not be possible to appropriately evaluate whether or not the ultraviolet illuminance sufficient to cure the ultraviolet curing adhesive is obtained.

特開２００９－１３４１９０号公報JP 2009-134190 A

本発明は、上記のような従来技術の問題点を解決するためになされたものであり、偏光フィルムと保護フィルムとの積層フィルム等の光学フィルムに塗工された紫外線硬化型接着剤を硬化させるのに十分な紫外線の照度が得られているか否かを適切に評価可能な紫外線照度評価方法、紫外線照度評価装置、及び紫外線照射装置を提供することを課題とする。 The present invention has been made to solve the problems of the prior art as described above, and cures an ultraviolet curable adhesive applied to an optical film such as a laminated film of a polarizing film and a protective film. An object of the present invention is to provide an ultraviolet illuminance evaluation method, an ultraviolet illuminance evaluation apparatus, and an ultraviolet irradiation apparatus capable of appropriately evaluating whether or not sufficient ultraviolet illuminance is obtained to obtain a sufficient ultraviolet illuminance.

前記課題を解決するため、本発明は、長手方向に搬送される光学フィルムに向けて紫外線照射器から照射される紫外線の照度を評価する方法であって、前記紫外線照射器は、紫外線発光手段として、前記光学フィルムの幅方向に延び、前記光学フィルムの幅と同等の長さを有する紫外線ランプを具備し、前記紫外線照射器に対して紫外線照度計を対向配置し、前記紫外線照度計を前記光学フィルムの長手方向に移動させながら前記紫外線の積算照度を測定し、前記光学フィルムの幅方向両端部に対応する位置における前記紫外線の積算照度が所定値以上であるか否かを判定し、前記幅方向両端部に対応する位置における前記紫外線の積算照度が何れも所定値以上である場合には、前記紫外線照射器から照射される紫外線の照度が良好であり、何れか一方が所定値未満である場合には、前記紫外線照射器から照射される紫外線の照度が不良である、と判定する、紫外線照度評価方法を提供する。 In order to solve the above-mentioned problems, the present invention provides a method for evaluating the illuminance of ultraviolet rays emitted from an ultraviolet irradiator toward an optical film conveyed in a longitudinal direction, wherein the ultraviolet irradiator serves as ultraviolet light emitting means. , an ultraviolet lamp extending in the width direction of the optical film and having a length equivalent to the width of the optical film, an ultraviolet illuminometer disposed opposite to the ultraviolet irradiation device, and the ultraviolet illuminometer The integrated illuminance of the ultraviolet rays is measured while moving the film in the longitudinal direction, and it is determined whether the integrated illuminance of the ultraviolet rays at positions corresponding to both ends in the width direction of the optical film is a predetermined value or more. If the integrated illuminance of the ultraviolet rays at the positions corresponding to both ends of the direction is equal to or greater than a predetermined value, the illuminance of the ultraviolet rays emitted from the ultraviolet irradiator is good, and one of them is less than the predetermined value. In some cases, an ultraviolet illuminance evaluation method is provided for determining that the illuminance of ultraviolet rays emitted from the ultraviolet irradiator is unsatisfactory .

本発明に係る紫外線照度評価方法によれば、紫外線照射器に対向配置した紫外線照度計を、光学フィルムの長手方向（光学フィルムの搬送方向）に移動させながら積算照度を測定することになる。光学フィルムに紫外線硬化型接着剤が塗工されている場合、この紫外線硬化型接着剤を硬化させるのに寄与する紫外線は、光学フィルムの搬送方向（長手方向）に沿った光学フィルム上の紫外線照射領域全体の紫外線である。本発明に係る紫外線照度評価方法によれば、光学フィルムの搬送方向に沿った紫外線照射領域全体の積算照度、すなわち、紫外線硬化型接着剤を硬化させるのに実際に寄与する紫外線全体の照度の積算量と相関を有する積算照度を測定することになるため、この積算照度の大小によって、紫外線硬化型接着剤を硬化させるのに十分な紫外線の照度が得られているか否かを適切に評価することができる。
また、一般に、光学フィルムの幅方向両端部に照射される紫外線の照度は、光学フィルムの幅方向中央部に照射される紫外線の照度よりも小さい場合が多い。
したがい、紫外線照射器から照射される紫外線の照度の良否を判定する際には、光学フィルムの幅方向両端部に対応する位置における紫外線の積算照度が所定値以上であるか否かを判定すれば済む（光学フィルムの幅方向中央部に対応する位置における紫外線の積算照度が所定値以上であるか否かを判定する必要がない）場合が多い。
本発明に係る紫外線照度評価方法によれば、光学フィルムの幅方向中央部に対応する位置における紫外線の積算照度を必ずしも測定する必要がないため、十分な紫外線の照度が得られているかを評価する際の手間が軽減される。
なお、本発明に係る紫外線照度評価方法を実施するに際しては、紫外線照射器から照射される紫外線の照射領域に光学フィルムがない状態で、紫外線照射器に対して紫外線照度計を対向配置して移動させればよい。ただし、本発明はこれに限るものではなく、スペースの制約が無い場合には、紫外線の照射領域に光学フィルムがある状態で、光学フィルムよりも手前側（紫外線照射器側）に紫外線照度計を対向配置して移動させることも可能である。 According to the ultraviolet illuminance evaluation method according to the present invention, the ultraviolet illuminance meter arranged opposite to the ultraviolet irradiator is moved in the longitudinal direction of the optical film (transport direction of the optical film) to measure the integrated illuminance. When the optical film is coated with an ultraviolet-curing adhesive, the ultraviolet rays that contribute to curing the ultraviolet-curing adhesive are irradiated on the optical film along the transport direction (longitudinal direction) of the optical film. UV for the whole area. According to the ultraviolet illuminance evaluation method according to the present invention, the integrated illuminance of the entire ultraviolet irradiation region along the transport direction of the optical film, that is, the integrated illuminance of the entire ultraviolet rays that actually contribute to curing the ultraviolet curing adhesive. Since the integrated illuminance that correlates with the amount is measured, it is necessary to appropriately evaluate whether or not the UV illuminance is sufficient to cure the UV-curable adhesive based on the magnitude of this integrated illuminance. can be done.
Further, generally, the illuminance of ultraviolet rays applied to both ends in the width direction of the optical film is often lower than the illuminance of ultraviolet rays applied to the center portion in the width direction of the optical film.
Therefore, when judging whether the illuminance of ultraviolet rays emitted from the ultraviolet irradiator is good or bad, it is necessary to judge whether or not the integrated illuminance of ultraviolet rays at positions corresponding to both ends in the width direction of the optical film is equal to or greater than a predetermined value. (It is not necessary to determine whether or not the integrated illuminance of ultraviolet light at the position corresponding to the central portion in the width direction of the optical film is equal to or greater than a predetermined value).
According to the method for evaluating ultraviolet illuminance according to the present invention, it is not necessary to measure the integrated illuminance of ultraviolet rays at the position corresponding to the central portion in the width direction of the optical film. Reduces time and effort.
In carrying out the method for evaluating ultraviolet illuminance according to the present invention, the ultraviolet illuminometer is placed opposite to the ultraviolet irradiator and moved in a state where there is no optical film in the irradiation area of the ultraviolet ray irradiated from the ultraviolet irradiator. Let it be. However, the present invention is not limited to this, and when there is no space constraint, an ultraviolet illuminometer is placed in front of the optical film (ultraviolet irradiator side) with the optical film in the ultraviolet irradiation area. It is also possible to dispose and move them facing each other.

長手方向に搬送される光学フィルムに向けて紫外線照射器から紫外線を照射する際、紫外線の照射領域において、光学フィルムは予め設定された一定速度で搬送されるのが一般的である。したがい、光学フィルムの搬送時に実際に照射される紫外線の積算照度と相関の強い積算照度を測定するには、紫外線照度計も紫外線照射領域において一定速度で移動させることが好ましい。
すなわち、本発明に係る紫外線照度評価方法では、前記紫外線の照射領域において、前記紫外線照度計を一定速度で移動させることが好ましい。 When the optical film conveyed in the longitudinal direction is irradiated with ultraviolet rays from the ultraviolet irradiator, the optical film is generally conveyed at a preset constant speed in the ultraviolet irradiation region. Therefore, in order to measure the integrated illuminance, which has a strong correlation with the integrated illuminance of the ultraviolet rays actually irradiated during transportation of the optical film, it is preferable to move the ultraviolet illuminometer at a constant speed in the ultraviolet irradiation area.
That is, in the ultraviolet illuminance evaluation method according to the present invention, it is preferable to move the ultraviolet illuminometer at a constant speed in the ultraviolet irradiation region.

上記の好ましい方法によれば、光学フィルムの搬送時に実際に照射される紫外線の積算照度と相関の強い積算照度を測定可能であるため、十分な紫外線の照度が得られているか否かをより一層適切に評価可能である。 According to the preferred method described above, it is possible to measure the integrated illuminance, which has a strong correlation with the integrated illuminance of ultraviolet rays actually irradiated during transportation of the optical film. Appropriately evaluable.

一般に、光学フィルムの幅方向中央部と幅方向両端部とでは、照射される紫外線の照度に差が生じる場合が多い。
したがい、本発明に係る紫外線照度評価方法において、前記光学フィルムの幅方向中央部及び幅方向両端部に対応する位置で前記紫外線の積算照度を測定することが好ましい。 In general, there is often a difference in the illuminance of the irradiated ultraviolet rays between the center portion in the width direction and the both end portions in the width direction of the optical film.
Therefore, in the ultraviolet illuminance evaluation method according to the present invention, it is preferable to measure the integrated illuminance of the ultraviolet rays at the positions corresponding to the center portion in the width direction and both ends in the width direction of the optical film.

上記の好ましい方法によれば、光学フィルムの幅方向全体について十分な紫外線の照度が得られているか否かを適切に評価可能である。 According to the preferable method described above, it is possible to appropriately evaluate whether or not a sufficient ultraviolet illuminance is obtained over the entire width direction of the optical film.

本発明に係る紫外線照度評価方法において、前記紫外線照度計を前記光学フィルムの搬送経路に沿って移動させることが好ましい。 In the ultraviolet illuminance evaluation method according to the present invention, it is preferable to move the ultraviolet illuminometer along the transport path of the optical film.

上記の好ましい方法によれば、光学フィルムの搬送時に実際に照射される紫外線の積算照度と相関の強い積算照度を測定可能であり、十分な紫外線の照度が得られているか否かをより一層適切に評価可能である。 According to the preferred method described above, it is possible to measure the integrated illuminance, which has a strong correlation with the integrated illuminance of the ultraviolet rays actually irradiated during transportation of the optical film, and it is possible to more appropriately determine whether or not the sufficient illuminance of the ultraviolet rays is obtained. can be evaluated to

また、前記課題を解決するため、本発明は、長手方向に搬送される光学フィルムに向けて紫外線照射器から照射される紫外線の照度を評価するための装置であって、前記紫外線照射器に対して対向配置される紫外線照度計と、前記紫外線照度計を前記光学フィルムの長手方向に移動させる駆動手段と、を備え、前記紫外線照射器は、紫外線発光手段として、前記光学フィルムの幅方向に延び、前記光学フィルムの幅と同等の長さを有する紫外線ランプを具備し、前記紫外線照度計は、前記駆動手段によって前記光学フィルムの長手方向に移動しながら前記紫外線の積算照度を測定し、前記光学フィルムの幅方向両端部に対応する位置における前記紫外線の積算照度が所定値以上であるか否かが判定され、前記幅方向両端部に対応する位置における前記紫外線の積算照度が何れも所定値以上である場合には、前記紫外線照射器から照射される紫外線の照度が良好であり、何れか一方が所定値未満である場合には、前記紫外線照射器から照射される紫外線の照度が不良である、と判定される、紫外線照度評価装置としても提供される。 Further, in order to solve the above problems, the present invention provides an apparatus for evaluating the illuminance of ultraviolet rays emitted from an ultraviolet irradiator toward an optical film conveyed in the longitudinal direction, wherein the ultraviolet irradiator and driving means for moving the ultraviolet illuminometer in the longitudinal direction of the optical film , wherein the ultraviolet irradiator extends in the width direction of the optical film as ultraviolet light emitting means. , an ultraviolet lamp having a length equivalent to the width of the optical film, and the ultraviolet illuminance meter measures the integrated illuminance of the ultraviolet rays while moving in the longitudinal direction of the optical film by the driving means; It is determined whether or not the integrated illuminance of the ultraviolet rays at the positions corresponding to both ends in the width direction of the film is equal to or greater than a predetermined value, and the integrated illuminance of the ultraviolet rays at the positions corresponding to the both ends in the width direction is equal to or greater than the predetermined value. , the illuminance of the ultraviolet rays emitted from the ultraviolet irradiator is good, and when either one is less than a predetermined value, the illuminance of the ultraviolet rays emitted from the ultraviolet irradiator is poor. , and is also provided as an ultraviolet illuminance evaluation device.

本発明に係る紫外線照度評価装置において、前記駆動手段は、前記光学フィルムの幅方向に延び、前記紫外線照度計が取り付けられる取付バーと、固定部、移動部、及び前記固定部に対して前記移動部を前記光学フィルムの長手方向に移動させる駆動部を有する一軸ステージと、を具備し、前記取付バーは、前記移動部に取り付けられることが好ましい。 In the ultraviolet illuminance evaluation apparatus according to the present invention, the driving means includes a mounting bar that extends in the width direction of the optical film and on which the ultraviolet illuminometer is mounted, a fixing portion, a moving portion, and the moving portion with respect to the fixing portion. a uniaxial stage having a driving portion that moves a portion in the longitudinal direction of the optical film, and the mounting bar is preferably attached to the moving portion.

上記の好ましい構成によれば、一軸ステージの駆動部によって移動部を光学フィルムの長手方向に移動させることにより、移動部に取り付けられた取付バーも光学フィルムの長手方向に移動することになる。取付バーが光学フィルムの長手方向に移動すれば、取付バーに取り付けられた紫外線照度計も光学フィルムの長手方向に移動することになる。したがい、紫外線照度計によって、光学フィルムの長手方向（光学フィルムの搬送方向）の積算照度を測定可能である。
また、取付バーが光学フィルムの幅方向に延びるため、例えば、取付バーの長さを光学フィルムの幅と同等にすれば、紫外線照度計を複数用意しなくても、取付バーにおける紫外線照度計の取り付け位置を変更することで、光学フィルムの幅方向中央部や幅方向両端部に対応する位置で紫外線の積算照度を測定可能である。 According to the above preferable configuration, by moving the moving part in the longitudinal direction of the optical film by the driving part of the uniaxial stage, the mounting bar attached to the moving part also moves in the longitudinal direction of the optical film. If the mounting bar moves in the longitudinal direction of the optical film, the ultraviolet illuminance meter attached to the mounting bar also moves in the longitudinal direction of the optical film. Therefore, the integrated illuminance in the longitudinal direction of the optical film (transporting direction of the optical film) can be measured by the ultraviolet illuminometer.
In addition, since the mounting bar extends in the width direction of the optical film, for example, if the length of the mounting bar is equal to the width of the optical film, there is no need to prepare multiple UV illuminometers. By changing the mounting position, it is possible to measure the cumulative illuminance of ultraviolet rays at positions corresponding to the widthwise central portion and the widthwise both ends of the optical film.

上記の好ましい構成において、前記駆動部は、サーボモータと、前記サーボモータの回転駆動力を直線駆動力に変換するボールねじと、を具備し、前記移動部は、前記ボールねじに取り付けられることが好ましい。 In the preferred configuration described above, the drive section may include a servomotor and a ball screw for converting rotational drive force of the servomotor into linear drive force, and the moving section may be attached to the ball screw. preferable.

上記の好ましい構成によれば、サーボモータを駆動することにより、サーボモータの回転駆動力がボールねじによって直線駆動力に変換され、ボールねじに取り付けられた移動部が直線移動することになる。これにより、移動部に取り付けられた取付バー、ひいては取付バーに取り付けられた紫外線照度計も直線移動することになる。サーボモータは、現在の回転位置を検出可能であると共に、回転速度や加減速の調整が可能であるため、紫外線照射器から照射される紫外線の照射領域において、紫外線照度計を一定速度で移動させることも可能である。 According to the above preferable configuration, by driving the servomotor, the rotational driving force of the servomotor is converted into linear driving force by the ball screw, and the moving part attached to the ball screw linearly moves. As a result, the attachment bar attached to the moving part and, in turn, the ultraviolet illuminance meter attached to the attachment bar are also linearly moved. The servomotor can detect the current rotational position and adjust the rotational speed and acceleration/deceleration, so it moves the ultraviolet illuminometer at a constant speed in the ultraviolet irradiation area emitted from the ultraviolet irradiator. is also possible.

さらに、前記課題を解決するため、本発明は、前述の何れかの紫外線照度評価装置と、紫外線照射器と、を備える、紫外線照射装置としても提供される。 Furthermore, in order to solve the above-described problems, the present invention also provides an ultraviolet irradiation device including any one of the ultraviolet irradiance evaluation devices described above and an ultraviolet irradiator.

本発明に係る紫外線照射装置において、前記紫外線照射器は、紫外線発光手段と、前記紫外線発光手段が発光した紫外線を反射して集光する反射鏡と、を具備し、前記紫外線照射器と前記紫外線照度計との距離が調整可能である、ことが好ましい。 In the ultraviolet irradiation device according to the present invention, the ultraviolet irradiator includes ultraviolet light emitting means and a reflector that reflects and converges the ultraviolet light emitted by the ultraviolet light emitting means, and the ultraviolet light irradiator and the ultraviolet light Preferably, the distance to the luminometer is adjustable.

上記の好ましい構成によれば、紫外線発光手段が発光した紫外線が反射鏡で反射して集光することになる。そして、紫外線照射器と紫外線照度計との距離が調整可能であるため、紫外線の集光位置が光学フィルムの搬送経路に合致するように上記の距離を調整することで、光学フィルムに効率良く紫外線を照射可能である。 According to the above preferable configuration, the ultraviolet light emitted by the ultraviolet light emitting means is reflected by the reflecting mirror and condensed. Since the distance between the UV irradiator and the UV illuminance meter is adjustable, by adjusting the above distance so that the UV light condensing position matches the transport path of the optical film, the optical film can be efficiently exposed to the UV light. can be irradiated.

本発明によれば、光学フィルムに塗工された紫外線硬化型接着剤を硬化させるのに十分な紫外線の照度が得られているか否かを適切に評価可能である。 According to the present invention, it is possible to appropriately evaluate whether or not sufficient UV illumination is obtained to cure the UV-curable adhesive applied to the optical film.

本発明の一実施形態に係る紫外線照度評価方法を適用する偏光フィルムを含む偏光板の製造設備の概略構成例を示す模式図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the example of a schematic structure of the manufacturing equipment of the polarizing plate containing a polarizing film which applies the ultraviolet illumination intensity evaluation method which concerns on one Embodiment of this invention. 本発明の一実施形態に係る紫外線照度評価方法を実行する紫外線照射装置の概略構成を模式的に示す正面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows typically schematic structure of the ultraviolet irradiation apparatus which performs the ultraviolet illumination intensity evaluation method which concerns on one Embodiment of this invention. 本発明の一実施形態に係る紫外線照度評価方法を実行する紫外線照射装置の概略構成を模式的に示す平面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows typically schematic structure of the ultraviolet irradiation apparatus which performs the ultraviolet illumination intensity evaluation method which concerns on one Embodiment of this invention. 本発明の一実施形態に係る紫外線照度評価方法を説明する図である。It is a figure explaining the ultraviolet illuminance evaluation method which concerns on one Embodiment of this invention. 本発明の一実施形態に係る紫外線照度評価方法によって測定した紫外線の積算照度の一例と、参考例として測定した紫外線のピーク照度の一例とを示す図である。It is a figure which shows an example of the integrated illuminance of the ultraviolet-ray measured by the ultraviolet illuminance evaluation method which concerns on one Embodiment of this invention, and an example of the peak illuminance of an ultraviolet-ray measured as a reference example.

以下、添付図面を適宜参照しつつ、本発明の一実施形態に係る紫外線照度評価方法（以下、適宜、単に「評価方法」という）について、光学フィルムが偏光フィルムである場合を例に挙げて説明する。 Hereinafter, an ultraviolet illuminance evaluation method according to an embodiment of the present invention (hereinafter simply referred to as "evaluation method") will be described with reference to the accompanying drawings, taking as an example the case where the optical film is a polarizing film. do.

図１は、本実施形態に係る紫外線照度評価方法を適用する偏光フィルムを含む偏光板の製造設備の概略構成例を示す模式図である。図１に示す矢符は、各フィルムの搬送方向を意味する。
図１に示す製造設備を用いて偏光板Ｆを製造するにあたっては、まず、繰出ローラ１に巻回されたポリビニルアルコール系フィルム等の原反フィルムＦ０を繰り出し、処理槽２内の処理浴に浸漬して、ヨウ素や二色性染料等の二色性物質で染色すると共に一軸延伸する。次いで、オーブン３で乾燥させることで、偏光フィルムＦ１が得られる。 FIG. 1 is a schematic diagram showing an example of the schematic configuration of a manufacturing facility for a polarizing plate including a polarizing film to which the ultraviolet illuminance evaluation method according to the present embodiment is applied. The arrows shown in FIG. 1 mean the transport direction of each film.
In manufacturing the polarizing plate F using the manufacturing equipment shown in FIG. Then, it is dyed with a dichroic substance such as iodine or a dichroic dye and uniaxially stretched. Then, by drying in an oven 3, a polarizing film F1 is obtained.

次いで、繰出ローラ５から繰り出された保護フィルムＦ２の片面にグラビアコータ６で紫外線硬化型接着剤（以下、ＵＶ接着剤という）を塗工する。そして、貼り合わせローラ７によって、ＵＶ接着剤が塗工された保護フィルムＦ２を偏光フィルムＦ１の両面に貼り合わせる。次いで、紫外線照射装置１００でＵＶ接着剤を硬化させた後、オーブン９で乾燥させる。最後に、両面に保護フィルムＦ２が貼り合わせられた偏光フィルムＦ１の片面に、繰出ローラ１０から繰り出された表面保護フィルムＦ３を貼り合わせローラ１１によって貼り合わせることで、偏光板Ｆが得られる。得られた偏光板Ｆは、巻取ローラ１２で巻き取られる。 Then, one side of the protective film F2 delivered from the delivery roller 5 is coated with an ultraviolet curable adhesive (hereinafter referred to as UV adhesive) by the gravure coater 6 . Then, the bonding roller 7 bonds the protective film F2 coated with the UV adhesive to both surfaces of the polarizing film F1. Next, after curing the UV adhesive with the ultraviolet irradiation device 100 , it is dried in the oven 9 . Finally, a polarizing plate F is obtained by bonding a surface protective film F3 drawn out from a feeding roller 10 to one side of the polarizing film F1 having protective films F2 bonded to both sides thereof by a bonding roller 11. - 特許庁The obtained polarizing plate F is wound up by the winding roller 12 .

なお、図１に示す例では、保護フィルムＦ２の表面にＵＶ接着剤を塗工しているが、偏光フィルムＦ１の表面にのみＵＶ接着剤を塗工したり、偏光フィルムＦ１及び保護フィルムＦ２の双方の表面にＵＶ接着剤を塗工することも可能である。また、図１に示す例では、偏光フィルムＦ１の両面に保護フィルムＦ２を貼り合わせているため、紫外線照射装置１００を２台配置しているが、偏光フィルムＦ１の片面にのみ保護フィルムＦ２を貼り合わせる場合には、紫外線照射装置１００は１台配置すればよい。 In the example shown in FIG. 1, the UV adhesive is applied to the surface of the protective film F2, but the UV adhesive may be applied only to the surface of the polarizing film F1, It is also possible to coat both surfaces with a UV adhesive. In addition, in the example shown in FIG. 1, since the protective film F2 is attached to both sides of the polarizing film F1, two ultraviolet irradiation devices 100 are arranged, but the protective film F2 is attached only to one side of the polarizing film F1. In the case of matching, one ultraviolet irradiation device 100 may be arranged.

本実施形態に係る評価方法は、以上に説明した偏光板Ｆの製造設備のうち、紫外線照射装置１００を用いて実行される。 The evaluation method according to the present embodiment is performed using the ultraviolet irradiation device 100 among the manufacturing facilities for the polarizing plate F described above.

図２は、本実施形態に係る評価方法を実行する紫外線照射装置１００の概略構成を模式的に示す正面図である。図２（ａ）は全体構成図であり、図２（ｂ）は図２（ａ）に示す破線Ｂで囲んだ領域の拡大図である。なお、図２（ａ）では、遮光ボックス４０及び紫外線照射器３０の内部を透視した状態で図示している。後述の図４（ａ）についても同様である。
図３は、本実施形態に係る評価方法を実行する紫外線照射装置１００の概略構成を模式的に示す平面図である。なお、図３では、サーボモータＭ、及び、反射鏡３３の図示を省略している。
図２及び図３に示すように、本実施形態に係る紫外線照射装置１００は、紫外線照度評価装置（以下、適宜、単に「評価装置」という）２０と、紫外線照射器３０と、遮光ボックス４０と、を備えている。 FIG. 2 is a front view schematically showing a schematic configuration of an ultraviolet irradiation device 100 that executes the evaluation method according to this embodiment. FIG. 2(a) is an overall configuration diagram, and FIG. 2(b) is an enlarged view of a region surrounded by a dashed line B shown in FIG. 2(a). In addition, in FIG. 2A, the insides of the light shielding box 40 and the ultraviolet irradiator 30 are shown in a see-through state. The same applies to FIG. 4(a), which will be described later.
FIG. 3 is a plan view schematically showing the schematic configuration of an ultraviolet irradiation device 100 that executes the evaluation method according to this embodiment. 3, illustration of the servo motor M and the reflecting mirror 33 is omitted.
As shown in FIGS. 2 and 3, the ultraviolet irradiation device 100 according to the present embodiment includes an ultraviolet illuminance evaluation device (hereinafter simply referred to as “evaluation device”) 20, an ultraviolet irradiation device 30, and a light shielding box 40. , is equipped with

評価装置２０は、長手方向（本実施形態では上下方向（Ｚ方向））に搬送される偏光フィルムＦ１（図２、図３では図示せず）に向けて紫外線照射器３０から照射される紫外線ＵＶの照度を評価するための装置である。本実施形態において、偏光フィルムＦ１は、図２（ａ）に示す搬送経路ＰＬに沿って、上から下に向けて（矢符Ａの方向に）搬送される。ただし、評価装置２０を用いて本実施形態に係る評価方法を実行する際、偏光フィルムＦ１は、紫外線照射器３０から照射される紫外線ＵＶの照射領域にない状態（具体的には、遮光ボックス４０の内部にない状態）とされる。
評価装置２０は、紫外線照射器３０に対して対向配置（本実施形態では水平方向（Ｘ方向）に対向配置）される紫外線照度計２１と、紫外線照度計２１を偏光フィルムＦ１の長手方向（Ｚ方向）に移動させる駆動手段２２と、を備えている。 The evaluation device 20 emits ultraviolet rays UV emitted from an ultraviolet irradiator 30 toward a polarizing film F1 (not shown in FIGS. 2 and 3) conveyed in the longitudinal direction (vertical direction (Z direction) in this embodiment). It is a device for evaluating the illuminance of In this embodiment, the polarizing film F1 is transported from top to bottom (in the direction of arrow A) along the transport path PL shown in FIG. 2(a). However, when performing the evaluation method according to the present embodiment using the evaluation device 20, the polarizing film F1 is not in the irradiation area of the ultraviolet UV irradiated from the ultraviolet irradiation device 30 (specifically, the light shielding box 40 is not inside).
The evaluation device 20 includes an ultraviolet illuminance meter 21 arranged opposite to the ultraviolet irradiator 30 (in this embodiment, oppositely arranged in the horizontal direction (X direction)), and an ultraviolet illuminance meter 21 arranged in the longitudinal direction (Z direction) of the polarizing film F1. direction).

紫外線照度計２１は、紫外線ＵＶの積算照度（測定時間内における紫外線ＵＶの照度の積算量）を測定可能である限りにおいて、その種類は特に限定されない。紫外線照度計２１としては、例えば、ヘレウス社製「PowerPuck II」を用いることができる。 The type of the ultraviolet illuminometer 21 is not particularly limited as long as it can measure the cumulative illuminance of ultraviolet rays UV (accumulated amount of illuminance of ultraviolet rays UV within the measurement time). As the ultraviolet illuminance meter 21, for example, "PowerPuck II" manufactured by Heraeus can be used.

駆動手段２２は、偏光フィルムＦ１の幅方向（Ｙ方向）に延び、紫外線照度計２１が取り付けられる取付バー２２１と、一軸ステージ２２２と、を具備する。紫外線照度計２１は、ねじ留め等の公知の方法によって、取付バー２２１の上面に脱着自在に取り付けられている。一軸ステージ２２２は、固定部２２２ａ、移動部２２２ｂ、及び固定部２２２ａに対して移動部２２２ｂを偏光フィルムＦ１の長手方向（Ｚ方向）に移動させる駆動部２２２ｃを有する。取付バー２２１は、ねじ留め等の公知の方法によって、一軸ステージ２２２の移動部２２２ｂに取り付けられている。 The driving means 22 includes a mounting bar 221 extending in the width direction (Y direction) of the polarizing film F1 and to which the ultraviolet illuminance meter 21 is mounted, and a uniaxial stage 222 . The ultraviolet illuminance meter 21 is detachably attached to the upper surface of the attachment bar 221 by a known method such as screwing. The uniaxial stage 222 has a fixed portion 222a, a moving portion 222b, and a driving portion 222c that moves the moving portion 222b relative to the fixed portion 222a in the longitudinal direction (Z direction) of the polarizing film F1. The mounting bar 221 is mounted on the moving portion 222b of the uniaxial stage 222 by a known method such as screwing.

駆動部２２２ｃは、サーボモータＭと、サーボモータＭの回転駆動力を直線駆動力に変換するボールねじＢＳと、を具備する。一軸ステージ２２２の移動部２２２ｂは、ボールねじＢＳに取り付けられている。サーボモータＭを駆動することにより、サーボモータＭの回転駆動力がボールねじＢＳによって直線駆動力に変換され、ボールねじＢＳに取り付けられた移動部２２２ｂが偏光フィルムＦ１の長手方向（Ｚ方向）に直線移動することになる。これにより、移動部２２２ｂに取り付けられた取付バー２２１、ひいては取付バー２２１に取り付けられた紫外線照度計２１も偏光フィルムＦ１の長手方向（Ｚ方向）に直線移動する。 The driving unit 222c includes a servomotor M and a ball screw BS that converts the rotational driving force of the servomotor M into a linear driving force. A moving part 222b of the uniaxial stage 222 is attached to a ball screw BS. By driving the servomotor M, the rotational driving force of the servomotor M is converted into a linear driving force by the ball screw BS, and the moving part 222b attached to the ball screw BS moves in the longitudinal direction (Z direction) of the polarizing film F1. It will move in a straight line. As a result, the attachment bar 221 attached to the moving portion 222b and the ultraviolet illuminance meter 21 attached to the attachment bar 221 are also linearly moved in the longitudinal direction (Z direction) of the polarizing film F1.

紫外線照射器３０は、中空の筐体３１と、筐体３１の内部に配置された紫外線発光手段３２及び反射鏡３３と、を具備する。
紫外線発光手段３２としては、紫外線発光手段３２が発光した紫外線ＵＶが偏光フィルムＦ１の幅方向（Ｙ方向）全体に照射されるように、偏光フィルムＦ１の幅方向に延び、偏光フィルムＦ１の幅と同等の長さを有する紫外線ランプ等が用いられる。
反射鏡３３としては、紫外線発光手段３２が発光した紫外線ＵＶのうち、偏光フィルムＦ１と反対側に発光した紫外線ＵＶを偏光フィルムＦ１側に反射して集光するように、偏光フィルムＦ１の幅方向（Ｙ方向）に延びる楕円柱面鏡等が用いられる。反射鏡３３として楕円柱面鏡を用いる場合、その楕円柱面の一方の焦点に紫外線発光手段３２を配置することで、他方の焦点に向けて紫外線ＵＶが集光することになる。
なお、紫外線照射器３０の筐体３１は、筐体３１ひいては紫外線照射器３０全体をＸ方向に進退動させる一軸ステージ（図示せず）に取り付けられており、この一軸ステージを駆動することで、紫外線照射器３０（紫外線発光手段３２）と紫外線照度計２１との距離が調整可能になっている。 The ultraviolet irradiator 30 includes a hollow housing 31 , and ultraviolet light emitting means 32 and a reflecting mirror 33 arranged inside the housing 31 .
As the ultraviolet light emitting means 32, the ultraviolet light emitted by the ultraviolet light emitting means 32 extends in the width direction of the polarizing film F1 so that the entire width direction (Y direction) of the polarizing film F1 is irradiated. A UV lamp or the like having an equivalent length is used.
As the reflecting mirror 33, of the ultraviolet rays UV emitted by the ultraviolet light emitting means 32, the ultraviolet rays UV emitted on the opposite side of the polarizing film F1 are reflected to the polarizing film F1 side and condensed. An elliptical cylindrical mirror or the like extending in the (Y direction) is used. When an elliptical cylindrical mirror is used as the reflecting mirror 33, by arranging the ultraviolet light emitting means 32 at one focal point of the elliptical cylindrical surface, the ultraviolet rays UV are condensed toward the other focal point.
The housing 31 of the ultraviolet irradiator 30 is attached to a uniaxial stage (not shown) that moves the housing 31 and the entire ultraviolet irradiator 30 back and forth in the X direction. By driving this uniaxial stage, The distance between the ultraviolet irradiator 30 (ultraviolet light emitting means 32) and the ultraviolet illuminometer 21 is adjustable.

遮光ボックス４０は、紫外線照射器３０から照射された紫外線ＵＶが、偏光フィルムＦ１の照射対象部位以外に照射されて、偏光フィルムＦ１にダメージを与えることがないように設けられている。遮光ボックス４０は、中空の筐体であり、その上面及び下面に、平面視で偏光フィルムＦ１の搬送経路ＰＬを含むように開口部４１が形成されている。開口部４１は、偏光フィルムＦ１、紫外線照度計２１、取付バー２２１、固定部２２２ａ及び移動部２２２ｂが通過できるサイズの矩形状に形成されている。
遮光ボックス４０の内部は、紫外線照射器３０の筐体３１の内部と連通している。具体的には、図２（ａ）に示す遮光ボックス４０の右端部と筐体３１の左端部とが開口しており、筐体３１の左端部が遮光ボックス４０の右端部に対してＸ方向に移動可能に嵌合している。前述の一軸ステージ（図示せず）によって紫外線照射器３０と紫外線照度計２１との距離を調整する際には、上記の嵌合状態を維持する範囲で、紫外線照射器３０がＸ方向に移動することになる。 The light shielding box 40 is provided so that the ultraviolet rays UV emitted from the ultraviolet ray irradiator 30 do not damage the polarizing film F1 by irradiating the portion other than the irradiation target portion of the polarizing film F1. The light shielding box 40 is a hollow housing, and an opening 41 is formed in its upper and lower surfaces so as to include the transport path PL of the polarizing film F1 in a plan view. The opening 41 is formed in a rectangular shape having a size through which the polarizing film F1, the ultraviolet illumination meter 21, the mounting bar 221, the fixed portion 222a and the moving portion 222b can pass.
The inside of the light shielding box 40 communicates with the inside of the housing 31 of the ultraviolet irradiation device 30 . Specifically, the right end of the light shielding box 40 and the left end of the housing 31 shown in FIG. is movably fitted to the When adjusting the distance between the ultraviolet irradiator 30 and the ultraviolet illuminance meter 21 by the above-mentioned uniaxial stage (not shown), the ultraviolet irradiator 30 moves in the X direction within the range in which the above-mentioned fitting state is maintained. It will be.

以下、上記の構成を有する紫外線照射装置１００が備える評価装置２０を用いた本実施形態に係る評価方法について説明する。
図４は、本実施形態に係る評価方法を説明する図である。図４（ａ）は全体構成図であり、図４（ｂ）は紫外線照度計２１の移動速度の変化パターンを示す図である。
本実施形態に係る評価方法は、長手方向（Ｚ方向）に搬送される偏光フィルムＦ１に向けて紫外線照射器３０から照射される紫外線ＵＶの照度を評価する方法である。具体的には、本実施形態に係る評価方法では、例えば、偏光板Ｆの製造開始前など、偏光フィルムＦ１を遮光ボックス４０の内部に搬送する前に、一軸ステージ２２２に取付バー２２１を取り付け、取付バー２２１に紫外線照度計２１を取り付ける。取付バー２２１における紫外線照度計２１の取り付け位置は、例えば、図３に実線で示すように、偏光フィルムＦ１の幅方向の一方の端部に対応する位置である取付バー２２１の長手方向の一方の端部とされる。 Hereinafter, an evaluation method according to the present embodiment using the evaluation device 20 provided in the ultraviolet irradiation device 100 having the above configuration will be described.
FIG. 4 is a diagram for explaining the evaluation method according to this embodiment. FIG. 4(a) is an overall configuration diagram, and FIG. 4(b) is a diagram showing a change pattern of the moving speed of the ultraviolet illuminometer 21. As shown in FIG.
The evaluation method according to the present embodiment is a method of evaluating the illuminance of ultraviolet rays UV emitted from the ultraviolet irradiator 30 toward the polarizing film F1 conveyed in the longitudinal direction (Z direction). Specifically, in the evaluation method according to the present embodiment, the mounting bar 221 is attached to the uniaxial stage 222 before the polarizing film F1 is transported into the light shielding box 40, such as before the start of manufacturing the polarizing plate F, The ultraviolet illuminance meter 21 is attached to the attachment bar 221 . The mounting position of the ultraviolet illuminance meter 21 on the mounting bar 221 is, for example, as indicated by the solid line in FIG. End.

次いで、一軸ステージ２２２を、遮光ボックス４０の上下の開口部４１を貫通するように配置する。この際、本実施形態では、紫外線照度計２１が偏光フィルムＦ１の搬送経路ＰＬに沿って移動可能なように、一軸ステージ２２２のＸ方向の配置位置を調整する。また、必要に応じて、スペーサ等を用いて一軸ステージ２２２に対する取付バー２２１のＸ方向の配置位置を調整することで、紫外線照度計２１のＸ方向の配置位置を調整してもよい。調整後の一軸ステージ２２２は、所定の治具（図示せず）を用いて遮光ボックス４０に固定される。また、必要に応じて、紫外線照射器３０をＸ方向に進退動させる一軸ステージ（図示せず）を駆動し、紫外線照射器３０（紫外線発光手段３２）と紫外線照度計２１との距離が、偏光フィルムＦ１を搬送する際の紫外線照射器３０（紫外線発光手段３２）と偏光フィルムＦ１との距離と同等になるように、紫外線照射器３０の位置を調整してもよい。紫外線照射器３０の位置を調整することにより、紫外線照度計２１の移動経路が偏光フィルムＦ１の搬送経路ＰＬからＸ方向にずれている場合であっても、偏光フィルムＦ１の搬送時に実際に照射される紫外線ＵＶの積算照度と相関の強い積算照度を測定することができる。 Next, the uniaxial stage 222 is arranged so as to pass through the upper and lower openings 41 of the light shielding box 40 . At this time, in this embodiment, the arrangement position of the uniaxial stage 222 in the X direction is adjusted so that the ultraviolet illuminance meter 21 can move along the transport path PL of the polarizing film F1. If necessary, the X-direction arrangement position of the ultraviolet illuminance meter 21 may be adjusted by adjusting the X-direction arrangement position of the mounting bar 221 with respect to the uniaxial stage 222 using a spacer or the like. The uniaxial stage 222 after adjustment is fixed to the light shielding box 40 using a predetermined jig (not shown). In addition, if necessary, a uniaxial stage (not shown) that moves the ultraviolet irradiator 30 back and forth in the X direction is driven, and the distance between the ultraviolet irradiator 30 (ultraviolet light emitting means 32) and the ultraviolet illuminance meter 21 is determined by the polarized light. The position of the ultraviolet irradiator 30 may be adjusted so that the distance between the ultraviolet irradiator 30 (ultraviolet light emitting means 32) and the polarizing film F1 when conveying the film F1 is the same. By adjusting the position of the ultraviolet irradiator 30, even if the movement path of the ultraviolet illuminance meter 21 is shifted in the X direction from the transportation path PL of the polarizing film F1, the polarizing film F1 is actually irradiated during transportation. It is possible to measure the integrated illuminance that has a strong correlation with the integrated illuminance of ultraviolet rays UV.

上記の準備が終了した後、紫外線照射器３０から紫外線ＵＶを照射する。この状態で、一軸ステージ２２２を駆動して、紫外線照度計２１を偏光フィルムＦ１の搬送経路ＰＬに沿って偏光フィルムＦ１の長手方向（矢符Ａの方向）に移動させながら紫外線ＵＶの積算照度を測定する。 After the above preparations are completed, ultraviolet rays UV are emitted from the ultraviolet irradiator 30 . In this state, the uniaxial stage 222 is driven to move the ultraviolet illuminance meter 21 along the transport path PL of the polarizing film F1 in the longitudinal direction (direction of arrow A) of the polarizing film F1, while measuring the integrated illuminance of the ultraviolet UV. Measure.

紫外線照度計２１の移動速度は、一軸ステージ２２２のサーボモータＭによって設定可能である。本実施形態では、紫外線照度計２１が遮光ボックス４０の上側の開口部４１から遮光ボックス４０の内部に入るまでの区間を加速区間とし、紫外線照度計２１が遮光ボックス４０の内部に位置する区間を測定区間とし、紫外線照度計２１が遮光ボックス４０の下側の開口部４１から抜けた後、図４（ａ）に二点鎖線で示す紫外線照度計２１の位置に至るまでの区間を減速区間とし、各区間における紫外線照度計２１の移動速度をサーボモータＭによって設定している。 The moving speed of the ultraviolet illuminometer 21 can be set by the servo motor M of the uniaxial stage 222 . In this embodiment, the section from the upper opening 41 of the light shielding box 40 to the inside of the light shielding box 40 is defined as the acceleration section, and the section where the ultraviolet light meter 21 is positioned inside the light shielding box 40 is defined as the acceleration section. After the ultraviolet illuminance meter 21 exits from the opening 41 on the lower side of the light shielding box 40, the area up to the position of the ultraviolet illuminance meter 21 indicated by the two-dot chain line in FIG. , the movement speed of the ultraviolet illuminance meter 21 in each section is set by the servo motor M. FIG.

本実施形態では、図４（ｂ）に示すように、紫外線ＵＶの照射領域である遮光ボックス４０内部の測定区間において、紫外線照度計２１を一定速度Ｖｃで移動させている。この一定速度Ｖｃを偏光フィルムＦ１の搬送時の搬送速度と同一に設定すれば、偏光フィルムＦ１の搬送時に実際に偏光フィルムＦ１に照射される紫外線ＵＶの積算照度と同等の積算照度を測定可能である。速度Ｖｃは、例えば、５～３０ｍ／ｍｉｎであり、５～１０ｍ／ｍｉｎがより好ましい。しかしながら、紫外線照度計２１を移動させる一定速度Ｖｃを必ずしも偏光フィルムＦ１の搬送速度と同一に設定する必要はない。紫外線照度計２１の一定速度Ｖｃの方が偏光フィルムＦ１の搬送速度よりも遅い場合には、測定時間が長くなる分だけ、紫外線照度計２１によって測定される積算照度は、偏光フィルムＦ１の搬送時に実際に偏光フィルムＦ１に照射される紫外線ＵＶの積算照度よりも大きくなるものの、実際の積算照度と相関の強い値が得られることには変わりない。逆に、紫外線照度計２１の一定速度Ｖｃの方が偏光フィルムＦ１の搬送速度よりも早い場合には、測定時間が短くなる分だけ、紫外線照度計２１によって測定される積算照度は、偏光フィルムＦ１の搬送時に実際に偏光フィルムＦ１に照射される紫外線ＵＶの積算照度よりも小さくなるものの、実際の積算照度と相関の強い値が得られることには変わりない。 In this embodiment, as shown in FIG. 4B, the ultraviolet illuminometer 21 is moved at a constant speed Vc in the measurement section inside the light shielding box 40, which is the irradiation area of the ultraviolet rays UV. If this constant speed Vc is set to be the same as the transport speed during transport of the polarizing film F1, it is possible to measure the integrated illuminance equivalent to the integrated illuminance of the ultraviolet UV actually irradiated to the polarizing film F1 during transport of the polarizing film F1. be. Velocity Vc is, for example, 5 to 30 m/min, more preferably 5 to 10 m/min. However, it is not always necessary to set the constant speed Vc for moving the ultraviolet illuminance meter 21 to be the same as the transport speed of the polarizing film F1. When the constant speed Vc of the ultraviolet illuminometer 21 is slower than the transportation speed of the polarizing film F1, the integrated illuminance measured by the ultraviolet illuminometer 21 is the same as the measurement time is longer, when the polarizing film F1 is transported. Although the illuminance is larger than the accumulated illuminance of the ultraviolet rays UV actually applied to the polarizing film F1, a value strongly correlated with the actual accumulated illuminance is obtained. Conversely, when the constant speed Vc of the ultraviolet illuminometer 21 is faster than the transport speed of the polarizing film F1, the integrated illuminance measured by the ultraviolet illuminometer 21 is reduced by the amount that the measurement time is shortened. Although the illuminance is smaller than the accumulated illuminance of the ultraviolet rays UV actually irradiated to the polarizing film F1 during the transportation of , a value strongly correlated with the actual accumulated illuminance is still obtained.

本実施形態に係る評価方法では、以上に説明した手順を、取付バー２２１における紫外線照度計２１の取り付け位置を変更して繰り返し実行する。具体的には、取付バー２２１における紫外線照度計２１の取り付け位置を、図３に二点鎖線で示すように、偏光フィルムＦ１の幅方向の他方の端部に対応する位置である取付バー２２１の長手方向の他方の端部（図３の右側の端部）や、偏光フィルムＦ１の幅方向中央部に対応する位置である取付バー２２１の長手方向中央部に変更して、上記の手順を繰り返し実行する。これにより、偏光フィルムＦ１の幅方向中央部及び幅方向両端部に対応する位置で紫外線ＵＶの積算照度を測定することができる。そして、例えば、偏光フィルムＦ１の幅方向中央部及び幅方向両端部に対応する位置での紫外線ＵＶの積算照度の全てが、所定値以上である場合には、紫外線照射器３０から照射される紫外線ＵＶの照度が良好であり、紫外線ＵＶの積算照度の何れかが、所定値未満である場合には、紫外線照射器３０から照射される紫外線ＵＶの照度が不良である、と判定する。不良であると判定した場合には、例えば、紫外線照射器３０の紫外線発光手段３２を冷却するための冷却手段（図示せず）を調整したり、紫外線発光手段３２の故障箇所を修理したり、新品に交換する等の対処を施せばよい。 In the evaluation method according to the present embodiment, the procedure described above is repeated by changing the mounting position of the ultraviolet illuminance meter 21 on the mounting bar 221 . Specifically, the mounting position of the ultraviolet illuminance meter 21 on the mounting bar 221 is, as indicated by the two-dot chain line in FIG. The other end in the longitudinal direction (the right end in FIG. 3) or the center in the longitudinal direction of the mounting bar 221 corresponding to the center in the width direction of the polarizing film F1 is changed, and the above procedure is repeated. Run. Thereby, the accumulated illuminance of the ultraviolet rays UV can be measured at the positions corresponding to the widthwise central portion and the widthwise both end portions of the polarizing film F1. Then, for example, when all the integrated illuminances of the ultraviolet rays UV at the positions corresponding to the widthwise central portion and the widthwise both ends of the polarizing film F1 are equal to or greater than a predetermined value, the ultraviolet rays emitted from the ultraviolet irradiator 30 If the illuminance of the UV is good and any of the integrated illuminances of the ultraviolet rays UV is less than a predetermined value, it is determined that the illuminance of the ultraviolet rays UV emitted from the ultraviolet irradiator 30 is unsatisfactory. If it is determined to be defective, for example, the cooling means (not shown) for cooling the ultraviolet light emitting means 32 of the ultraviolet irradiator 30 is adjusted, the failure part of the ultraviolet light emitting means 32 is repaired, A countermeasure such as exchanging with a new product may be taken.

なお、本実施形態では、単一の紫外線照度計２１の取り付け位置を偏光フィルムＦ１の幅方向中央部及び幅方向両端部に対応する位置に順次変更して、各取り付け位置で紫外線ＵＶの積算照度を測定しているが、本発明はこれに限るものではない。例えば、各取り付け位置の数に対応する複数（本実施形態の例では３つ）の紫外線照度計２１を用意し、この複数の紫外線照度計２１を全て取付バー２２１に取り付けて同時に移動させ、複数箇所での紫外線ＵＶの積算照度を同時に測定することも可能である。 In this embodiment, the mounting position of the single ultraviolet illuminance meter 21 is sequentially changed to positions corresponding to the width direction central portion and the width direction both ends of the polarizing film F1, and the integrated illuminance of ultraviolet UV at each mounting position is measured, but the present invention is not limited to this. For example, a plurality of ultraviolet illuminometers 21 corresponding to the number of mounting positions (three in the example of the present embodiment) are prepared, and all of the plurality of ultraviolet illuminometers 21 are mounted on the mounting bar 221 and moved at the same time. It is also possible to simultaneously measure the integrated illuminance of ultraviolet rays UV at a point.

また、本実施形態では、偏光フィルムＦ１の幅方向中央部及び幅方向両端部に対応する位置での紫外線ＵＶの積算照度を測定しているが、一般に、偏光フィルムＦ１の幅方向両端部に照射される紫外線ＵＶの照度は、偏光フィルムＦ１の幅方向中央部に照射される紫外線ＵＶの照度よりも小さい場合が多い。このため、偏光フィルムＦ１の幅方向両端部に対応する位置における紫外線ＵＶの積算照度のみを測定し、この積算照度が所定値以上であるか否かを判定する方法を採用することも可能である。 Further, in the present embodiment, the integrated illuminance of ultraviolet UV is measured at positions corresponding to the width direction central portion and width direction both ends of the polarizing film F1, but in general, both width direction ends of the polarizing film F1 are irradiated. The illuminance of the ultraviolet rays UV applied is often smaller than the illuminance of the ultraviolet rays UV applied to the central portion in the width direction of the polarizing film F1. Therefore, it is also possible to adopt a method of measuring only the integrated illuminance of ultraviolet rays UV at positions corresponding to both ends in the width direction of the polarizing film F1 and determining whether or not the integrated illuminance is equal to or greater than a predetermined value. .

また、本実施形態では、偏光フィルムＦ１の搬送方向と同じように、紫外線照度計２１を上から下に向けて（矢符Ａの方向に）移動させながら紫外線ＵＶの積算照度を測定しているが、偏光フィルムＦ１の搬送方向と逆向きに（下から上に向けて）紫外線照度計２１を移動させながら紫外線ＵＶの積算照度を測定してもよい。移動の向きを反転させても、一定速度Ｖｃが同じである限り、同じ積算照度を測定可能である。 Further, in the present embodiment, the integrated illuminance of ultraviolet rays UV is measured while moving the ultraviolet illuminance meter 21 from top to bottom (in the direction of arrow A) in the same manner as in the transport direction of the polarizing film F1. However, the integrated illuminance of ultraviolet rays UV may be measured while moving the ultraviolet illuminance meter 21 in the direction opposite to the transport direction of the polarizing film F1 (from bottom to top). Even if the direction of movement is reversed, the same integrated illuminance can be measured as long as the constant speed Vc is the same.

さらに、本実施形態では、光学フィルムが偏光フィルムＦ１である場合を例に挙げて説明したが、本発明は、これに限るものではなく、紫外線ＵＶを照射する光学フィルムである限りにおいて、その他の各種光学フィルムに適用可能である。 Furthermore, in the present embodiment, the case where the optical film is the polarizing film F1 has been described as an example, but the present invention is not limited to this, as long as the optical film is irradiated with ultraviolet rays UV, other It is applicable to various optical films.

図５は、本実施形態に係る評価方法によって測定した紫外線ＵＶの積算照度の一例と、参考例として測定した紫外線ＵＶのピーク照度の一例とを示す図である。図５（ａ）は積算照度の一例を、図５（ｂ）はピーク照度の一例を示す。
具体的には、図５（ａ）は、紫外線照度計２１の取り付け位置を偏光フィルムＦ１の幅方向の７箇所に対応する位置に順次変更して、各取り付け位置で紫外線ＵＶの積算照度を測定した結果である。図５（ｂ）は、紫外線照度計２１の取り付け位置を図５（ａ）の場合と同じ７箇所の位置に順次変更して、紫外線照度計２１を矢符Ａ（図４参照）の方向に移動させ、各取り付け位置での紫外線ＵＶのピーク照度（最大照度）を測定した結果である。
図５（ａ）及び（ｂ）の横軸は、偏光フィルムＦ１の幅方向中心に対応する位置（取付バー２２１の長手方向中心位置）を基準とした（０ｍｍとした）、紫外線照度計２１の各取り付け位置を意味する。図５（ａ）及び（ｂ）の縦軸は、偏光フィルムＦ１の幅方向中心に対応する位置での測定値を基準とした（１．００とした）相対値を意味する。 FIG. 5 is a diagram showing an example of integrated illuminance of ultraviolet rays UV measured by the evaluation method according to the present embodiment and an example of peak illuminance of ultraviolet rays UV measured as a reference example. FIG. 5(a) shows an example of integrated illuminance, and FIG. 5(b) shows an example of peak illuminance.
Specifically, in FIG. 5A, the mounting position of the ultraviolet illuminance meter 21 is sequentially changed to positions corresponding to seven positions in the width direction of the polarizing film F1, and the integrated illuminance of the ultraviolet UV is measured at each mounting position. This is the result of In FIG. 5(b), the mounting positions of the ultraviolet illuminometer 21 are sequentially changed to the same seven positions as in FIG. 5(a), and the ultraviolet illuminometer 21 is moved in the direction of arrow A (see FIG. It is the result of moving and measuring the peak illuminance (maximum illuminance) of ultraviolet UV at each mounting position.
5A and 5B, the horizontal axis of the ultraviolet illuminance meter 21 is based on the position corresponding to the center of the width direction of the polarizing film F1 (the center position of the mounting bar 221 in the longitudinal direction) (0 mm). Means each mounting position. The vertical axes in FIGS. 5(a) and 5(b) mean relative values (set to 1.00) based on the measured value at the position corresponding to the width direction center of the polarizing film F1.

図５（ａ）と図５（ｂ）とを比較すれば分かるように、図５（ａ）に示す積算照度の測定結果の方が、図５（ｂ）に示すピーク照度の測定結果よりも、測定結果のバラツキ（偏光フィルムＦ１の幅方向についてのバラツキ）が大きい。偏光フィルムＦ１に塗工されたＵＶ接着剤を硬化させるのに寄与する紫外線ＵＶは、偏光フィルムＦ１の搬送方向（Ｚ方向）に沿った偏光フィルムＦ１上の紫外線照射領域全体の紫外線ＵＶである。本実施形態に係る評価方法によれば、偏光フィルムＦ１の搬送方向に沿った紫外線照射領域全体の積算照度、すなわち、ＵＶ接着剤を硬化させるのに実際に寄与する紫外線ＵＶ全体の照度の積算量と相関を有する積算照度を測定することになるため、紫外線照射器３０から照射される紫外線ＵＶの照度の良否を適切に評価可能である。例えば、図５（ａ）に示す結果において、偏光フィルムＦ１の幅方向両端部に対応する位置での紫外線ＵＶの積算照度が幅方向中央部に対応する位置での積算照度に比べて小さいため、紫外線照射器３０から照射される紫外線ＵＶの照度が不良であると判定すべき状態であったと仮に考える。このように不良であると判定すべき状態であっても、図５（ｂ）に示す結果では、偏光フィルムＦ１の幅方向両端部に対応する位置での紫外線ＵＶのピーク照度が幅方向中央部に対応する位置でのピーク照度に比べてあまり小さくなっていないため、紫外線照射器３０から照射される紫外線ＵＶの照度が良好であると誤判定するおそれがある。 As can be seen by comparing FIG. 5(a) and FIG. 5(b), the integrated illuminance measurement result shown in FIG. 5(a) is higher than the peak illuminance measurement result shown in FIG. 5(b). , the variation in the measurement results (variation in the width direction of the polarizing film F1) is large. The ultraviolet rays UV that contribute to curing the UV adhesive applied to the polarizing film F1 are the ultraviolet rays UV of the entire ultraviolet irradiation area on the polarizing film F1 along the transport direction (Z direction) of the polarizing film F1. According to the evaluation method according to the present embodiment, the integrated illuminance of the entire ultraviolet irradiation area along the transport direction of the polarizing film F1, that is, the integrated amount of the illuminance of the entire ultraviolet UV that actually contributes to curing the UV adhesive. Since the integrated illuminance having a correlation with is measured, it is possible to appropriately evaluate the quality of the illuminance of the ultraviolet ray UV emitted from the ultraviolet ray irradiator 30 . For example, in the result shown in FIG. 5(a), since the integrated illuminance of ultraviolet UV at the positions corresponding to both ends in the width direction of the polarizing film F1 is smaller than the integrated illuminance at the position corresponding to the central part in the width direction, Assume that the illuminance of the ultraviolet rays UV emitted from the ultraviolet ray irradiator 30 should be judged to be defective. Even in such a state that should be determined to be defective, the results shown in FIG. Since it is not much smaller than the peak illuminance at the position corresponding to , there is a risk of erroneously determining that the illuminance of the ultraviolet rays UV emitted from the ultraviolet irradiator 30 is good.

１００・・・紫外線照射装置
２０・・・紫外線照度評価装置
２１・・・紫外線照度計
２２・・・駆動手段
３０・・・紫外線照射器
３２・・・紫外線発光手段
３３・・・反射鏡
４０・・・遮光ボックス
４１・・・開口部
２２１・・・取付バー
２２２・・・一軸ステージ
２２２ａ・・・固定部
２２２ｂ・・・移動部
２２２ｃ・・・駆動部
ＢＳ・・・ボールねじ
Ｆ１・・・偏光フィルム（光学フィルム）
Ｍ・・・サーボモータ
ＵＶ・・・紫外線 DESCRIPTION OF SYMBOLS 100... Ultraviolet irradiation apparatus 20... Ultraviolet illuminance evaluation apparatus 21... Ultraviolet illuminance meter 22... Driving means 30... Ultraviolet irradiator 32... Ultraviolet light emission means 33... Reflector 40. Light shielding box 41 Opening 221 Mounting bar 222 Single axis stage 222a Fixed part 222b Moving part 222c Driving part BS Ball screw F1 Polarizing film (optical film)
M・・・Servo motor UV・・・Ultraviolet rays

Claims (9)

長手方向に搬送される光学フィルムに向けて紫外線照射器から照射される紫外線の照度を評価する方法であって、
前記紫外線照射器は、紫外線発光手段として、前記光学フィルムの幅方向に延び、前記光学フィルムの幅と同等の長さを有する紫外線ランプを具備し、
前記紫外線照射器に対して紫外線照度計を対向配置し、前記紫外線照度計を前記光学フィルムの長手方向に移動させながら前記紫外線の積算照度を測定し、
前記光学フィルムの幅方向両端部に対応する位置における前記紫外線の積算照度が所定値以上であるか否かを判定し、前記幅方向両端部に対応する位置における前記紫外線の積算照度が何れも所定値以上である場合には、前記紫外線照射器から照射される紫外線の照度が良好であり、何れか一方が所定値未満である場合には、前記紫外線照射器から照射される紫外線の照度が不良である、と判定する、
紫外線照度評価方法。 A method for evaluating the illuminance of ultraviolet rays emitted from an ultraviolet irradiator toward an optical film conveyed in the longitudinal direction,
The ultraviolet irradiator includes an ultraviolet lamp as an ultraviolet light emitting means that extends in the width direction of the optical film and has a length equivalent to the width of the optical film,
An ultraviolet illuminometer is arranged opposite to the ultraviolet irradiator, and the integrated illuminance of the ultraviolet rays is measured while moving the ultraviolet illuminometer in the longitudinal direction of the optical film,
Determining whether the integrated illuminance of the ultraviolet rays at positions corresponding to both ends in the width direction of the optical film is equal to or greater than a predetermined value, and determining whether the integrated illuminance of the ultraviolet rays at the positions corresponding to both ends in the width direction is a predetermined value If it is equal to or more than the value, the illuminance of the ultraviolet rays emitted from the ultraviolet irradiator is good, and if either one is less than the predetermined value, the illuminance of the ultraviolet rays emitted from the ultraviolet irradiator is bad. is determined to be
UV illuminance evaluation method. 前記紫外線の照射領域において、前記紫外線照度計を一定速度で移動させる、
請求項１に記載の紫外線照度評価方法。 moving the ultraviolet illuminometer at a constant speed in the ultraviolet irradiation area;
The ultraviolet illuminance evaluation method according to claim 1. 前記光学フィルムの幅方向中央部及び幅方向両端部に対応する位置で前記紫外線の積算照度を測定する、請求項１又は２に記載の紫外線照度評価方法。 3. The ultraviolet illuminance evaluation method according to claim 1, wherein the integrated illuminance of the ultraviolet rays is measured at positions corresponding to the widthwise central portion and the widthwise both end portions of the optical film. 前記紫外線照度計を前記光学フィルムの搬送経路に沿って移動させる、請求項１から３の何れか一項に記載の紫外線照度評価方法。 The ultraviolet illuminance evaluation method according to any one of claims 1 to 3 , wherein the ultraviolet illuminance meter is moved along the transport path of the optical film. 長手方向に搬送される光学フィルムに向けて紫外線照射器から照射される紫外線の照度を評価するための装置であって、
前記紫外線照射器に対して対向配置される紫外線照度計と、
前記紫外線照度計を前記光学フィルムの長手方向に移動させる駆動手段と、
を備え、
前記紫外線照射器は、紫外線発光手段として、前記光学フィルムの幅方向に延び、前記光学フィルムの幅と同等の長さを有する紫外線ランプを具備し、
前記紫外線照度計は、前記駆動手段によって前記光学フィルムの長手方向に移動しながら前記紫外線の積算照度を測定し、
前記光学フィルムの幅方向両端部に対応する位置における前記紫外線の積算照度が所定値以上であるか否かが判定され、前記幅方向両端部に対応する位置における前記紫外線の積算照度が何れも所定値以上である場合には、前記紫外線照射器から照射される紫外線の照度が良好であり、何れか一方が所定値未満である場合には、前記紫外線照射器から照射される紫外線の照度が不良である、と判定される、
紫外線照度評価装置。 A device for evaluating the illuminance of ultraviolet rays emitted from an ultraviolet irradiator toward an optical film conveyed in the longitudinal direction,
An ultraviolet illuminometer arranged opposite to the ultraviolet irradiator;
a driving means for moving the ultraviolet illuminometer in the longitudinal direction of the optical film;
with
The ultraviolet irradiator includes an ultraviolet lamp as an ultraviolet light emitting means that extends in the width direction of the optical film and has a length equivalent to the width of the optical film,
The ultraviolet illuminance meter measures the integrated illuminance of the ultraviolet rays while moving in the longitudinal direction of the optical film by the driving means,
It is determined whether the integrated illuminance of the ultraviolet rays at positions corresponding to both ends in the width direction of the optical film is equal to or greater than a predetermined value, and the integrated illuminance of the ultraviolet rays at the positions corresponding to both ends in the width direction is a predetermined value. If it is equal to or more than the value, the illuminance of the ultraviolet rays emitted from the ultraviolet irradiator is good, and if either one is less than the predetermined value, the illuminance of the ultraviolet rays emitted from the ultraviolet irradiator is bad. is determined to be
UV illuminance evaluation device. 前記駆動手段は、
前記光学フィルムの幅方向に延び、前記紫外線照度計が取り付けられる取付バーと、
固定部、移動部、及び前記固定部に対して前記移動部を前記光学フィルムの長手方向に移動させる駆動部を有する一軸ステージと、を具備し、
前記取付バーは、前記移動部に取り付けられる、
請求項５に記載の紫外線照度評価装置。 The drive means
a mounting bar extending in the width direction of the optical film and on which the ultraviolet illuminometer is mounted;
a uniaxial stage having a fixed part, a moving part, and a driving part for moving the moving part with respect to the fixed part in the longitudinal direction of the optical film;
The mounting bar is attached to the moving part,
The ultraviolet illuminance evaluation device according to claim 5 . 前記駆動部は、
サーボモータと、
前記サーボモータの回転駆動力を直線駆動力に変換するボールねじと、を具備し、
前記移動部は、前記ボールねじに取り付けられる、
請求項６に記載の紫外線照度評価装置。 The drive unit
a servo motor;
a ball screw that converts the rotational driving force of the servomotor into a linear driving force,
The moving part is attached to the ball screw,
The ultraviolet illuminance evaluation device according to claim 6 . 請求項５から７の何れか一項に記載の紫外線照度評価装置と、
前記紫外線照射器と、を備える、
紫外線照射装置。 The ultraviolet illuminance evaluation device according to any one of claims 5 to 7 ;
and the ultraviolet irradiator,
UV irradiation device. 前記紫外線照射器は、
紫外線発光手段と、
前記紫外線発光手段が発光した紫外線を反射して集光する反射鏡と、を具備し、
前記紫外線照射器と前記紫外線照度計との距離が調整可能である、
請求項８に記載の紫外線照射装置。 The ultraviolet irradiator is
UV emitting means;
a reflecting mirror that reflects and converges the ultraviolet light emitted by the ultraviolet light emitting means;
The distance between the ultraviolet irradiator and the ultraviolet illuminometer is adjustable,
The ultraviolet irradiation device according to claim 8 .
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