JP2010223598A - Flaw inspection device for sheet-like article - Google Patents

Flaw inspection device for sheet-like article Download PDF

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JP2010223598A
JP2010223598A JP2009068179A JP2009068179A JP2010223598A JP 2010223598 A JP2010223598 A JP 2010223598A JP 2009068179 A JP2009068179 A JP 2009068179A JP 2009068179 A JP2009068179 A JP 2009068179A JP 2010223598 A JP2010223598 A JP 2010223598A
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light
sheet
receiving unit
light receiving
defect
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Shigeru Tanaka
茂 田中
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Kaneka Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a flaw inspection device performing flaw control of high reliability, by realizing the discrimination between the harmful actual flaw of a transparent sheet-like article and the foreign matter adhered to the surface of the transparent sheet-like article on the basis of the relatively simple collation of detection data by an apparatus constituted of one floodlight projection part and two light-detecting parts. <P>SOLUTION: The flaw inspection device is equipped with the floodlight projection part for linearly illuminating the width direction of the running transparent sheet-like article from a direction oblique, with respect to the running direction of the sheet-like article; the first light-detecting part arranged on the side opposite to the floodlight projection part to detect the illumination light transmitted through the sheet-like article; the second light-detecting part arranged in the direction of a dark field to detect the light diffused or scattered by the illumination light from the floodlight projecting part; and a signal processing part for collating the detection data of the first light-detecting part with the detection data of the second light-detecting part, to discriminate whether the flaw of the sheet-like article is the foreign matter adhered to the surface of the sheet-like article or another flaw. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、シート状物の実欠陥と表面に付着した異物とを判別しながら検査する装置に関する。   The present invention relates to an apparatus for inspecting an actual defect of a sheet-like object while discriminating between foreign matters attached to the surface.

液晶等に用いる光学フィルムや電子機器部品等に用いる高機能性フィルムは、近年ますます異物に対する要求規格が厳しくなりつつあり、これらのシート状物はクリーンルームで製造され、製造ライン中にある欠陥検査機によってシート状物の欠陥に関する品質の管理が行われている。しかし、運転員の作業等によって発生する環境起因の異物や、スリット工程等で発生したシート状物の切り屑が工程内に飛散することがあり、これらの異物がシート状物の表面に付着することがある。そのため、製造ライン中にある欠陥検査機は、シート状物の品質として有害な実欠陥と、後工程で除去可能な表面に付着した異物とを混在して検出し、一般に実欠陥と付着した異物をリアルタイムで判別をすることは容易ではない。従って、工程トラブル等によって実欠陥が多発した場合でも、付着した異物の増加と間違えて工程への対処が遅れるといった問題があった。   In recent years, optical film used for liquid crystals, etc., and high-functional films used for electronic equipment parts, etc., are becoming increasingly demanding standards for foreign substances, and these sheet-like materials are manufactured in a clean room, and are inspected for defects in the production line. Quality control regarding defects in sheet-like materials is performed by the machine. However, environment-related foreign matters generated by the operator's work, etc., and sheet-like chips generated in the slitting process may scatter in the process, and these foreign matters adhere to the surface of the sheet-like material. Sometimes. For this reason, defect inspection machines in the production line detect and detect both actual defects that are harmful as the quality of the sheet-like material and foreign substances that have adhered to the surface that can be removed in a later process. It is not easy to discriminate in real time. Therefore, even when actual defects frequently occur due to process troubles, there is a problem that the handling of the process is delayed due to an increase in adhering foreign matter.

この問題を解決するため、シート状物の生産ラインに斜方照明と落射照明等の2系統以上の複数の検査光学系を走行方法に並べて備え、各光学系で検出した画像についてパターンマッチング等の解析によって欠陥を判別する方法(例えば、特許文献1参照)が提案されている。   In order to solve this problem, a sheet-like product production line is provided with a plurality of inspection optical systems of two or more systems such as oblique illumination and epi-illumination arranged in the traveling method, and pattern matching is performed on images detected by each optical system. A method for discriminating defects by analysis (for example, see Patent Document 1) has been proposed.

しかしながら、上述の方法では、欠陥判別のためのパターンマッチング等を行う際に膨大な統計データに基づいた複雑な解析が必要であり、各光学系の信号処理装置の上位システムとしてのコントローラが別途必要となり、設備費用やメンテナンス費用が高くなるといった問題があった。   However, the above-described method requires a complicated analysis based on enormous statistical data when performing pattern matching for defect determination, etc., and requires a separate controller as a host system for the signal processing device of each optical system Thus, there was a problem that the equipment cost and the maintenance cost were high.

また、実欠陥と付着異物を判別する方法として、シート状物生産ラインの上流側と下流側に2式の欠陥検査機を配置し、両者検査機の間に付着異物除去装置を設けて、上流側と下流側の欠陥検査データを比較して実欠陥のみを検出する方法(例えば、特許文献2参照)が提案されている。   In addition, as a method for discriminating actual defects and adhered foreign substances, two types of defect inspection machines are arranged on the upstream side and the downstream side of the sheet-like material production line, and an adhered foreign substance removing device is provided between the two inspection machines. A method of detecting only actual defects by comparing the defect inspection data on the side and the downstream side (see, for example, Patent Document 2) has been proposed.

しかしながら、上述の従来の方法では、シート状物の走行時の蛇行やシワ等が発生する場合には、上流側と下流側の両者検査機データについて厳密な座標値で比較できないことや、製造工程によっては、スペースの制約によって走行方向に2式の欠陥検査機が設置できないといった問題があった。   However, in the above-described conventional method, when meandering, wrinkles, etc. occur during the travel of the sheet-like material, it is not possible to compare the upstream and downstream inspection machine data with exact coordinate values, and the manufacturing process. Depending on space, there is a problem that two types of defect inspection machines cannot be installed in the traveling direction due to space restrictions.

特開2003−215051号公報JP 2003-215051 A 特開2007−108125号公報JP 2007-108125 A

本発明は、従来の技術の上記問題点を解決し、透明体シート状物の有害な実欠陥と表面に付着した異物との判別を、1つの投光部と2つの受光部から構成された省スペースの装置によって、比較的単純な検出データの照合で実現し、製造工程において信頼性の高い欠陥管理を行う欠陥検査装置を提供することを目的としている。   The present invention solves the above-mentioned problems of the prior art, and is configured by one light projecting part and two light receiving parts to discriminate between harmful actual defects of the transparent sheet-like material and foreign matters adhering to the surface. An object of the present invention is to provide a defect inspection apparatus which can be realized by relatively simple detection data collation using a space-saving apparatus and performs highly reliable defect management in a manufacturing process.

本発明に係わる透明体シート状物の欠陥検査装置は、上記課題を解決するために、走行する透明体シート状物の走行方向に対して斜めからシート状物の幅方向をライン状に照明する投光部と、シート状物を透過した照明光を投光部と反対側に配置して検出する第1受光部と、投光部から照明された照明光によって拡散または散乱した光を暗視野の方向に配置して検出する第2受光部と、第1受光部の検出データと第2受光部の検出データとを照合することによって、シート状物の欠陥が表面に付着した異物であるか、その他の欠陥であるかを判別する信号処理部とを具備することを特徴としている。   In order to solve the above-mentioned problems, the transparent sheet-like defect inspection apparatus according to the present invention illuminates the width direction of the sheet-like object in a line form obliquely with respect to the traveling direction of the traveling transparent sheet-like object. A light projecting unit, a first light receiving unit that detects illumination light transmitted through the sheet-like material on the side opposite to the light projecting unit, and a dark field of light diffused or scattered by the illumination light illuminated from the light projecting unit Whether the defect of the sheet-like material is a foreign matter attached to the surface by collating the second light receiving unit that is arranged in the direction of detection and the detection data of the first light receiving unit with the detection data of the second light receiving unit And a signal processing unit for determining whether the defect is another defect.

上記構成によれば、1つの投光部から照明されたシート状物に対して、透過する方向と拡散または散乱する方向からシート状物の同じ部位を2つの受光部で撮像するため、同じ欠陥や異物について同じ座標で同時に検出することが可能になり、欠陥の画像パターンによる解析等を行わずに、第1受光部の検出された欠陥について第2受光部でも検出されるか否かを照合することによって判別することが可能となる。従って、2つの受光部において、欠陥の走行方向および幅方向の検出座標に大きなズレが生じることがなく、シート状物が蛇行して走行した場合でも座標を補正して照合するなど処理が不要となる点で優れている。また、2つの光学系を走行方向に一定の距離を置いて配置しないため、省スペースとなる点で好ましい。   According to the above configuration, since the same part of the sheet material is imaged by the two light receiving units from the transmitting direction and the diffusing or scattering direction with respect to the sheet material illuminated from one light projecting unit, the same defect Can be detected at the same coordinates at the same time, and whether or not the detected defect of the first light-receiving unit is also detected by the second light-receiving unit without performing analysis using the image pattern of the defect, etc. This makes it possible to make a determination. Therefore, in the two light receiving units, there is no great deviation in the detected coordinates in the running direction and the width direction of the defect, and processing such as correcting and collating the coordinates even when the sheet-like object runs meandering is unnecessary. It is excellent in that. Further, the two optical systems are not arranged at a certain distance in the traveling direction, which is preferable in terms of saving space.

ここで、第1受光部と第2受光部に用いるイメージセンサカメラには、製造ラインの速度を検出するために設置した1つのエンコーダから信号を分岐して各受光部のカメラに取り込むことにより、走行方向での座標のズレを防止することが可能になる。また、第1受光部と第2受光部のイメージセンサカメラは、幅方向の分解能を同一にし、欠陥を幅方向で同等のサイズで検出するために、同じ台数にすることが好ましい。   Here, in the image sensor camera used for the first light receiving unit and the second light receiving unit, by branching a signal from one encoder installed to detect the speed of the production line and taking it into the camera of each light receiving unit, It becomes possible to prevent the deviation of the coordinates in the traveling direction. The image sensor cameras of the first light receiving unit and the second light receiving unit preferably have the same number in order to have the same resolution in the width direction and detect defects with the same size in the width direction.

本発明に係わる透明体シート状物の欠陥検査装置において、投光部の光源は輝度が高く、指向性が強い状態の照明光とし、シート状物の表面に付着した異物によって、一部の照明光を拡散または散乱させることを特徴としている。   In the defect inspection apparatus for a transparent sheet according to the present invention, the light source of the light projecting unit is illumination light with high brightness and strong directivity, and part of the illumination is caused by foreign matter adhering to the surface of the sheet. It is characterized by diffusing or scattering light.

上記構成によれば、輝度が高く、指向性が強い照明光を用いることによって、第1受光部と第2受光部に対して、1つの照明装置で、透過光による欠陥検出と拡散光または散乱光による欠陥検出が可能となる。   According to the above configuration, by using illumination light having high luminance and strong directivity, defect detection and diffused light or scattering by transmitted light can be performed with one illumination device for the first light receiving unit and the second light receiving unit. Defect detection by light becomes possible.

本発明に係わる透明体シート状物の欠陥検査装置において、第1受光部は、一次元のイメージセンサカメラを用い、カメラのレンズの絞り値を高く調整することにより、照明光によるイメージセンサの飽和の防止と被写界深度の大きな光学系にすることを特徴としている。   In the defect inspection apparatus for a transparent sheet according to the present invention, the first light receiving unit uses a one-dimensional image sensor camera and adjusts the aperture value of the lens of the camera to be high so that the image sensor is saturated with illumination light. It is characterized by making it an optical system with a large depth of field.

上記構成によれば、輝度が高く、指向性が強い照明光に対して、特殊な光学系を用いずにイメージセンサの飽和を防止できる点で好ましい。また、カメラのレンズの絞り値を高くすることによって被写界深度が大きくなり、シート状物の厚み方向に対して斜めに透過する照明光に対して、欠陥が厚み方向のどの位置にあっても鮮明な画像で検出できる点で優れている。   According to the said structure, it is preferable at the point which can prevent saturation of an image sensor, without using a special optical system with respect to illumination light with high brightness | luminance and strong directivity. Also, by increasing the aperture value of the camera lens, the depth of field increases, and the position of the defect in the thickness direction with respect to the illumination light that is transmitted obliquely with respect to the thickness direction of the sheet-like material. Is excellent in that it can be detected with a clear image.

本発明に係わる透明体シート状物の欠陥検査装置において、第2受光部は、一次元のイメージセンサカメラを用い、シート状物の表面に付着した異物によって拡散または散乱した光を明欠陥として検出できるように、カメラのレンズの絞り値を低く調整することと、光源の輝度を調整することと、照明の光軸の角度を調整することと、輝度信号の明欠陥検出のしきい値とを適切に調整し、欠陥を検出する装置であることを特徴とする。   In the defect inspection apparatus for a transparent sheet according to the present invention, the second light receiving unit detects light diffused or scattered by a foreign matter attached to the surface of the sheet as a bright defect using a one-dimensional image sensor camera. Adjusting the aperture value of the camera lens to a low value, adjusting the brightness of the light source, adjusting the angle of the optical axis of the illumination, and the threshold for detecting the light defect in the brightness signal It is a device that adjusts appropriately and detects defects.

上記構成によれば、シート状物の表面に付着した異物によって拡散または散乱した微弱な光に対して、カメラレンズの絞り値と光源の輝度と照明光軸の角度の3つの調整手段の選択および組み合わせにより、シート状物の表面に異物が付着していない地合信号から欠陥の信号を強調してS/N比を向上させることが可能となる。   According to the above configuration, for the weak light diffused or scattered by the foreign matter adhering to the surface of the sheet-like object, the selection of the three adjustment means of the aperture value of the camera lens, the luminance of the light source, and the angle of the illumination optical axis By the combination, it is possible to enhance the S / N ratio by emphasizing the defect signal from the formation signal in which no foreign matter adheres to the surface of the sheet-like material.

ここで、第2受光部で検出する明欠陥とは、シート状物の表面に異物が付着していないときの輝度の地合信号レベルに対して、表面に付着した異物によって拡散光または散乱光がしきい値を越えて輝度が高くなった場合の欠陥をいう。   Here, the bright defect detected by the second light receiving unit is diffused light or scattered light by the foreign matter attached to the surface with respect to the brightness signal level when the foreign matter is not attached to the surface of the sheet-like object. Refers to a defect when the brightness increases beyond the threshold.

また、シート状物の内部に微細なフィラーが存在する場合でも、フィラーによる散乱光と、表面に付着した異物による拡散光または散乱光とを、輝度信号レベルのしきい値で分離することが可能である。   In addition, even when a fine filler is present inside the sheet, it is possible to separate the scattered light from the filler and the diffused or scattered light from the foreign matter adhering to the surface with a threshold of the luminance signal level. It is.

本発明に係わる透明体シート状物の欠陥検査装置において、信号処理部は、第1受光部におけるシート状物の暗欠陥と明欠陥の両方の検出データと、第2受光部におけるシート状物の明欠陥の検出データとを取り込み、第2受光部の検出データをシート状物の表面に付着した異物と判定し、第1受光部の検出データと第2受光部の検出データについてシート状物の走行方向と幅方向の座標を照合し、座標が一致しない第1受光部のみで検出したデータを実欠陥と判定することを特徴としている。   In the defect inspection apparatus for a transparent sheet according to the present invention, the signal processing unit is configured to detect detection data of both dark defects and bright defects of the sheet in the first light receiving unit, and sheet detection in the second light receiving unit. The detection data of the light defect is taken in, the detection data of the second light receiving unit is determined as a foreign matter adhering to the surface of the sheet, and the detection data of the first light receiving unit and the detection data of the second light receiving unit are The coordinates of the running direction and the width direction are collated, and the data detected only by the first light receiving unit whose coordinates do not match is determined as an actual defect.

上記方法によれば、シート状物を透過した光の輝度の強弱によって実欠陥や表面に付着した異物を含めて全欠陥を漏れなく検出する第1受光部の検出データと、表面に付着した異物のみを検出する第2受光部のデータとを照合することにより、一つの受光部では成し得なかった実欠陥と付着した異物との判別を比較的単純な信号処理で行うことができる。   According to the above method, the detection data of the first light receiving unit for detecting all the defects including the actual defect and the foreign matter attached to the surface by the intensity of the light transmitted through the sheet-like material, and the foreign matter attached to the surface. By comparing the data of the second light receiving unit that detects only the actual light defect, it is possible to discriminate between an actual defect that could not be achieved by one light receiving unit and the attached foreign matter with relatively simple signal processing.

ここで、第1受光部で検出する暗欠陥とは、シート状物に実欠陥や異物がない状態での透過光輝度を地合信号の基準として、実欠陥や異物によって透過光が減衰や遮断されてしきい値を越えて輝度が低くなった場合の欠陥をいう。また、第1受光部で検出する明欠陥とは、シート状物に実欠陥や異物がない状態での透過光輝度を地合信号の基準として、気泡や凹状欠陥によって透過光が増加されてしきい値を越えて輝度が高くなった場合の欠陥をいう。   Here, the dark defect detected by the first light-receiving unit means that the transmitted light is attenuated or blocked by the actual defect or the foreign matter with the transmitted light luminance in the state where the sheet-like object is free of the real defect or the foreign matter as a reference of the formation signal. This is a defect when the brightness is lowered beyond the threshold. In addition, the bright defect detected by the first light-receiving unit means that the transmitted light is increased by air bubbles or concave defects with the transmitted light luminance in the state where there is no actual defect or foreign matter in the sheet-like object as a reference of the formation signal. Defects when the brightness increases beyond the threshold.

また、透過光を検出する第1受光部では、表面に付着した異物は光を遮る暗欠陥として検出し、拡散光および散乱光を検出する第2受光部では、表面に付着した異物を明欠陥として検出するが、第1受光部の暗欠陥と第2受光部の明欠陥の座標に基づいてデータを照合することによって実欠陥と付着した異物との判定が可能となる。   Further, in the first light receiving unit that detects transmitted light, the foreign matter attached to the surface is detected as a dark defect that blocks light, and in the second light receiving unit that detects diffused light and scattered light, the foreign matter attached to the surface is detected as a bright defect. However, by comparing data based on the coordinates of the dark defect of the first light receiving unit and the bright defect of the second light receiving unit, it is possible to determine the actual defect and the attached foreign matter.

本発明によれば、透明体シート状物の有害な実欠陥と表面に付着した異物との判別を、1つの投光部と2つの受光部から構成された省スペースの装置によって、比較的単純な検出データの照合で実現でき、製造工程において信頼性の高い欠陥管理や実欠陥発生時に早期に対処できるという効果を奏する。   According to the present invention, it is relatively simple to discriminate between harmful actual defects of a transparent sheet-like material and foreign matter adhering to the surface by a space-saving device composed of one light projecting unit and two light receiving units. It can be realized by checking the detected data, and has the effect of being able to deal with the defect management with high reliability in the manufacturing process and deal with the early occurrence of an actual defect.

本発明の実施形態に係る透明体シート状物の欠陥検査装置の一例を示す図である。It is a figure which shows an example of the defect inspection apparatus of the transparent body sheet-like object which concerns on embodiment of this invention. 本発明の実施形態に係る第1受光部および第2受光部の欠陥検出データの二次元マップの二値化表示の一例を示す図である。It is a figure which shows an example of the binarization display of the two-dimensional map of the defect detection data of the 1st light-receiving part which concerns on embodiment of this invention, and a 2nd light-receiving part.

以下に、本発明に係わる透明体シート状物の欠陥検査装置に関して図1に基づいて説明する。尚、以下の実施形態は、本発明を具体化した一例であって、本発明の技術的範囲を限定する性格のものではない。   The transparent sheet-like defect inspection apparatus according to the present invention will be described below with reference to FIG. In addition, the following embodiment is an example which actualized this invention, Comprising: The thing of the character which limits the technical scope of this invention is not.

図1は、本発明の実施の形態に係る透明体シート状物の欠陥検査装置の概略構成を示す模式図である。   FIG. 1 is a schematic diagram illustrating a schematic configuration of a defect inspection apparatus for a transparent sheet according to an embodiment of the present invention.

図1において、A方向に走行する透明体のシート状物Wに対して、下方向から投光部3によって角度θでシート状物Wの位置Pの幅方向全域を斜めからスリット状に照明し、照明の光軸上の反対側に配置した第1受光部1によってシート状物Wの位置Pを透過した照明光の幅方向の輝度分布を検出し、シート状物Wの走行方向Aに対して直角に近い角度で上方向に第2受光部2を配置し、シート状物Wの位置Pに付着異物Tが通過した場合に、その付着異物Tによる拡散または散乱した照明光の幅方向の輝度分布を第2受光部2で検出する。第1受光部1と第2受光部2にはシート状物Wのライン速度を検出するために設置した一つのエンコーダ5から信号を分岐して入力し、第1受光部1と第2受光部2の検出データは信号処理部4で取り込み、信号処理部4では第1受光部1と第2受光部2の検出データを照合して実欠陥と付着した異物とを判別して検出する構成としている。   In FIG. 1, with respect to the transparent sheet-like object W traveling in the A direction, the entire width direction of the position P of the sheet-like object W is illuminated obliquely in a slit shape by the light projecting unit 3 from below. The brightness distribution in the width direction of the illumination light transmitted through the position P of the sheet-like object W is detected by the first light receiving unit 1 arranged on the opposite side of the illumination optical axis, and the traveling direction A of the sheet-like object W is detected. When the second light receiving unit 2 is arranged at an angle close to a right angle and the attached foreign matter T passes through the position P of the sheet-like object W, the diffused or scattered illumination light in the width direction is scattered by the attached foreign matter T. The luminance distribution is detected by the second light receiving unit 2. The first light receiving unit 1 and the second light receiving unit 2 branch and input a signal from one encoder 5 installed to detect the line speed of the sheet W, and the first light receiving unit 1 and the second light receiving unit. 2 is captured by the signal processing unit 4, and the signal processing unit 4 collates the detection data of the first light receiving unit 1 and the second light receiving unit 2 to discriminate between the actual defect and the attached foreign matter. Yes.

第1受光部1は、例えば、一次元CCDセンサのカメラ(一次元のイメージセンサカメラ)等を用いることができ、カメラの分解能は、検出が必要な欠陥や異物の寸法に対して、好ましくは1/4以下のサイズになるように設定し、その分解能によって定まった検査視野幅がシート状物Wの幅よりも小さい場合は、シート状物Wの幅をカバーできるように複数台のカメラを幅方向に配置する。   As the first light receiving unit 1, for example, a one-dimensional CCD sensor camera (one-dimensional image sensor camera) or the like can be used, and the resolution of the camera is preferably set to the size of a defect or foreign matter that needs to be detected. If the inspection visual field width determined by the resolution is smaller than the width of the sheet-like object W, a plurality of cameras are installed so that the width of the sheet-like object W can be covered. Arrange in the width direction.

第1受光部1のカメラレンズは、絞り値をF=5.6以上に設定することによって被写界深度が大きくなり、シート状物Wの位置Pの厚み方向に対して斜めに透過する照明光に対して、欠陥や異物が厚み方向のどの位置にあっても検出が可能となる。   The camera lens of the first light receiving unit 1 has a depth of field that is increased by setting the aperture value to F = 5.6 or more, and is transmitted obliquely with respect to the thickness direction of the position P of the sheet W. Detection can be made at any position in the thickness direction of the defect or foreign matter with respect to the light.

第1受光部1の配置位置は、投光部3による照明光の光軸線上であり、かつ、シート状物Wに対して、投光部3の反対側である。もちろん、効果を奏する範囲内において、厳密に、光軸線上である必要はない。   The arrangement position of the first light receiving unit 1 is on the optical axis of the illumination light by the light projecting unit 3 and is opposite to the light projecting unit 3 with respect to the sheet-like object W. Of course, it is not necessary to be strictly on the optical axis within the range where the effect is exhibited.

また、第1受光部1において、CCDセンサの飽和を避けるために必要に応じてカメラレンズの手前に光を減衰させるための図示していないフィルタ(例えばNDフィルタ)を用いてもよい。   In the first light receiving unit 1, a filter (for example, an ND filter) (not shown) for attenuating light may be used in front of the camera lens as necessary in order to avoid saturation of the CCD sensor.

第2受光部2は、第1受光部1と同様に、例えば、一次元CCDセンサのカメラ(一次元のイメージセンサカメラ)等を用いることができ、カメラの分解能は検出が必要な異物の寸法に対して、好ましくは1/4以下のサイズになるように設定し、その分解能によって定まった検査視野幅がシート状物Wの幅よりも小さい場合は、シート状物Wの幅をカバーできるように複数台のカメラを幅方向に配置する。信号処理部4では、第1受光部1と第2受光部2のシート状物Wの幅方向と走行方向Aの座標に基づいて欠陥を照合するので、各受光部間の欠陥の座標のズレを極小化するために、第1受光部1と第2受光部2の各カメラは同じ台数にすることが好ましい。   For example, a camera of a one-dimensional CCD sensor (one-dimensional image sensor camera) or the like can be used for the second light receiving unit 2 as in the case of the first light receiving unit 1, and the resolution of the camera is the size of a foreign object that needs to be detected. In contrast, when the inspection field width determined by the resolution is smaller than the width of the sheet W, the width of the sheet W can be covered. A plurality of cameras are arranged in the width direction. In the signal processing unit 4, defects are collated based on the coordinates of the width direction of the sheet W and the traveling direction A of the first light receiving unit 1 and the second light receiving unit 2. In order to minimize the number of cameras, it is preferable to use the same number of cameras in the first light receiving unit 1 and the second light receiving unit 2.

第2受光部2のカメラレンズは、微弱な拡散光または散乱光を検出するために絞り値をF=5.6以下に設定することが好ましい。   The camera lens of the second light receiving unit 2 is preferably set to an aperture value of F = 5.6 or less in order to detect weak diffused light or scattered light.

第2受光部2の配置位置は、投光部から照明された照明光によって拡散または散乱した光を暗視野で検出する方向である。具体的には、シート状物Wの走行方向Aに対して直角に近い角度で上方向に第2受光部2は配置されるが、暗視野であれば、上記に限定されない。   The arrangement position of the second light receiving unit 2 is a direction in which the light diffused or scattered by the illumination light illuminated from the light projecting unit is detected in the dark field. Specifically, although the second light receiving unit 2 is disposed upward at an angle close to a right angle with respect to the traveling direction A of the sheet-like object W, the second light receiving unit 2 is not limited to the above as long as it is a dark field.

投光部3は、シート状物Wの表面の付着異物Tによる拡散光または散乱光が第2受光部2で検出できるように、輝度が高く、指向性が強い照明光とするため、メタルハライドランプやハロゲンランプやLEDアレイなどの高輝度の光源を用いることが好ましい。投光部3において指向性が強い照明にするために、投光部3の光の照射面とシート状物Wの位置Pとの距離を200mm以上とすることが好ましい。シート状物Wの位置Pに対して投光部3による照明光の光軸との角度θは、第2受光部2において付着異物Tによる拡散光または散乱光の検出感度が適切となる範囲で調整し、角度θを20度〜70度の範囲とすることが好ましい。   The light projecting unit 3 is a metal halide lamp that has high brightness and high directivity so that the second light receiving unit 2 can detect diffused light or scattered light due to the adhered foreign matter T on the surface of the sheet W. It is preferable to use a high-intensity light source such as a halogen lamp or an LED array. In order to provide illumination with strong directivity in the light projecting unit 3, the distance between the light irradiation surface of the light projecting unit 3 and the position P of the sheet W is preferably 200 mm or more. The angle θ between the position P of the sheet-like object W and the optical axis of the illumination light by the light projecting unit 3 is within a range where the detection sensitivity of diffused light or scattered light by the adhering foreign matter T in the second light receiving unit 2 is appropriate. It is preferable to adjust the angle θ to be in the range of 20 degrees to 70 degrees.

信号処理部4は、第1受光部1で検出した暗欠陥および明欠陥の検出データと、第2受光部2で検出した明欠陥の検出データとを取り込み、欠陥の検出を開始した時点からシート状物Wの走行方向Aと幅方向の座標に基づいて逐次照合し、第2受光部2で検出した欠陥を付着異物Tと判定し、第1受光部1の検出データから同じ座標で検出された第2受光部2の検出データを照合して差し引き、第1受光部1のみで検出したデータを実欠陥と判定する。   The signal processing unit 4 captures the dark defect and bright defect detection data detected by the first light receiving unit 1 and the bright defect detection data detected by the second light receiving unit 2, and starts the detection of the defect from the sheet. Based on the coordinates of the traveling direction A and the width direction of the object W, it is sequentially verified, the defect detected by the second light receiving unit 2 is determined as the adhering foreign matter T, and detected from the detection data of the first light receiving unit 1 at the same coordinates. The detected data of the second light receiving unit 2 is collated and subtracted, and the data detected only by the first light receiving unit 1 is determined as an actual defect.

ここで、第1受光部1で検出した暗欠陥とは、シート状物Wの内部または表面に付着した異物によって、投光部3からの照明光を吸収または遮断されることによって第1受光部1において検出する輝度が、異物や欠陥が存在しないシート状物Wを透過して検出された輝度よりも弱まり、予め設定したしきい値よりも輝度が弱い、すなわち、暗い画像となる欠陥をいう。第1受光部1で検出される暗欠陥には、シート状物Wの表面に付着した異物や、シート状物Wの内部に光を吸収または遮断する異物等が存在する実欠陥がある。   Here, the dark defect detected by the 1st light-receiving part 1 is a 1st light-receiving part by absorbing or interrupting | blocking the illumination light from the light projection part 3 with the foreign material adhering to the inside or the surface of the sheet-like object W The defect detected in 1 is a defect that is weaker than the brightness detected through the sheet-like object W that does not have any foreign matters or defects, and is weaker than a preset threshold value, that is, a dark image. . The dark defects detected by the first light receiving unit 1 include actual defects in which foreign matter attached to the surface of the sheet-like object W, foreign matter that absorbs or blocks light inside the sheet-like object W, and the like exist.

また、第1受光部1で検出した明欠陥とは、シート状物Wの表面の凹み等の形状変形部や、内部の空洞等によって、第1受光部1において検出する投光部3からの照明光の輝度が、異物や欠陥が存在しないシート状物Wを透過して検出された輝度よりも強まり、予め設定したしきい値よりも輝度が強い、すなわち、明るい画像となる欠陥をいう。   In addition, the bright defect detected by the first light receiving unit 1 means that the light defect from the light projecting unit 3 detected by the first light receiving unit 1 due to a shape deformed part such as a dent on the surface of the sheet W or an internal cavity. This is a defect in which the brightness of the illumination light is higher than the brightness detected through the sheet-like object W without foreign matter or defects, and the brightness is higher than a preset threshold value, that is, a bright image.

また、第2受光部2で検出した明欠陥とは、シート状物Wの表面に付着した異物によって、投光部3からの照明光の拡散または散乱した光を第2受光部2において検出する輝度が、表面に異物が存在しないシート状物Wによって拡散または散乱して検出された輝度よりも強まり、予め設定したしきい値よりも輝度が高い、すなわち、明るい画像となる欠陥をいう。第2受光部2で検出される明欠陥は、シート状物Wの表面に付着した異物のみであり、シート状物Wの表面の疵等の欠陥によって光が拡散または散乱することもあるが、これらの輝度は微弱であり、第2受光部2で検出する輝度が、表面に付着した異物によって拡散または散乱した光を判定するためのしきい値を越えることはない。   In addition, the bright defect detected by the second light receiving unit 2 means that the second light receiving unit 2 detects light diffused or scattered from the light projecting unit 3 by a foreign matter attached to the surface of the sheet-like object W. This is a defect in which the luminance is higher than the luminance detected by diffusing or scattering by the sheet-like object W having no foreign matter on the surface, and the luminance is higher than a preset threshold value, that is, a bright image. The bright defects detected by the second light receiving unit 2 are only foreign matters adhering to the surface of the sheet W, and light may be diffused or scattered by defects such as wrinkles on the surface of the sheet W. These luminances are weak, and the luminance detected by the second light receiving unit 2 does not exceed the threshold value for determining the light diffused or scattered by the foreign matter attached to the surface.

このように、第1受光部1では暗欠陥と明欠陥とを検出することによって実欠陥や表面に付着した異物とを検出でき、第2受光部2では明欠陥のみを検出することによって、第1受光部1の検出データから同じ座標で検出された第2受光部2の検出データを照合して差し引き、第1受光部1のみで検出したデータを実欠陥と判定することにより、表面に付着した異物のみを検出することが可能となる。   As described above, the first light receiving unit 1 can detect a dark defect and a bright defect to detect an actual defect or a foreign matter attached to the surface, and the second light receiving unit 2 can detect only a bright defect to detect the first defect. The detection data of the second light receiving unit 2 detected at the same coordinates is subtracted from the detection data of the first light receiving unit 1 and subtracted, and the data detected only by the first light receiving unit 1 is determined as an actual defect, so that it adheres to the surface. It is possible to detect only the foreign matter.

信号処理部4による欠陥の座標の照合において、幅方向については、第1受光部1での検出座標を基準として第2受光部2の検出座標にカメラの幅方向分解能の左右1ビット分のズレを考慮して判定することが好ましく、走行方向Aについては、第1受光部1での検出座標を基準として第2受光部2の検出座標にエンコーダのパルス幅に相当した走行方向Aの分解能の前後1ビット分のズレを考慮して判定することが好ましい。   In the verification of the coordinates of the defect by the signal processing unit 4, in the width direction, the detected coordinate of the second light receiving unit 2 is shifted to the detected coordinate of the second light receiving unit 2 with respect to the left and right 1-bit resolution in the width direction of the camera. The traveling direction A is determined with the resolution in the traveling direction A corresponding to the pulse width of the encoder in the detected coordinates of the second light receiving unit 2 with reference to the detected coordinates in the first light receiving unit 1. It is preferable to make a determination in consideration of a shift of one bit before and after.

このように、上記方法によれば、シート状物を透過した光の輝度を検出する第1受光部では、実欠陥と表面に付着した異物も含めて全欠陥を漏れなく検出し、表面に付着した異物のみを検出する第2受光部のデータとを照合する比較的単純な信号処理によって、実欠陥と付着した異物との判別が可能となる。   As described above, according to the above method, the first light receiving unit that detects the luminance of the light transmitted through the sheet-like object detects all defects including the actual defect and the foreign matter attached to the surface without omission and adheres to the surface. It is possible to discriminate between the actual defect and the attached foreign matter by relatively simple signal processing that collates with the data of the second light receiving unit that detects only the foreign matter that has been detected.

(実施例1)
12m/分で走行するイミド系樹脂フィルムについて、厚みが25μmのフィルムを対象とし、図1に示した構成で、第1受光部と第2受光部に各々有効画素4000ビットの一次元CCDセンサカメラを用い、走行方向の分解能は、第1受光部と第2受光部共に20μmとなるようにCCDセンサカメラのスキャンレートを調整し、幅方向の分解能は、第1受光部と第2受光部共に20μmとなるようにカメラレンズの倍率と視野を調整した。第1受光部のカメラレンズの絞り値は5.6とし、第2受光部のカメラレンズの絞り値を2.8とした。投光部は、LEDアレイ照明を用い、フィルム面との角度を65度とし、照明の先端部とフィルム面までの距離を350mmの配置とした。
Example 1
A imide-based resin film traveling at 12 m / min is intended for a film having a thickness of 25 μm, and the configuration shown in FIG. The scan rate of the CCD sensor camera is adjusted so that the resolution in the traveling direction is 20 μm for both the first light receiving unit and the second light receiving unit, and the resolution in the width direction is set for both the first light receiving unit and the second light receiving unit. The magnification and field of view of the camera lens were adjusted so as to be 20 μm. The aperture value of the camera lens of the first light receiving unit was 5.6, and the aperture value of the camera lens of the second light receiving unit was 2.8. The light projecting unit used LED array illumination, the angle with the film surface was 65 degrees, and the distance between the front end of the illumination and the film surface was 350 mm.

上述の条件において、予め別途欠陥検査機で検査した実欠陥を含むフィルムを対象とし、第1受光部と第2受光部の上流側で、100μm〜1000μmの異物を作為的に付着させ、信号処理装置で検出データの座標の照合による実欠陥と付着した異物との判別評価を行った。   Under the above-mentioned conditions, a film containing an actual defect separately inspected in advance by a defect inspection machine is used as a target, and a foreign substance of 100 μm to 1000 μm is intentionally attached on the upstream side of the first light receiving unit and the second light receiving unit, and signal processing is performed. Discrimination evaluation between the actual defect and the adhered foreign material was performed by collating the coordinates of the detection data with the device.

評価の結果、第1受光部では実欠陥(フィルム内部混入異物や表面汚れ等)と付着異物の全ての欠陥を検出し、第2受光部では付着異物のみを検出すること確認した。   As a result of the evaluation, it was confirmed that the first light receiving unit detected actual defects (such as foreign matter mixed in the film and surface contamination) and all the foreign particles attached, and the second light receiving unit detected only the attached foreign matter.

図2に第1受光部と第2受光部で検出した欠陥データを、それぞれ二次元マップにして二値化した画像の一例を示す。図2(a)は、第1受光部で検出した二次元マップの暗欠陥の二値化画像であり、図中に矢印で指示された部位がフィルム内部混入異物または表面汚れであり、その他は表面に付着した異物である。図2(b)は、第2受光部で検出した二次元マップの明欠陥の二値化画像であり、表面に付着した異物のみを検出して表示したものであり、実欠陥(フィルム内部混入異物または表面汚れ)が存在する部位には目的通りに何も検出されていないことを確認した。   FIG. 2 shows an example of an image obtained by binarizing the defect data detected by the first light receiving unit and the second light receiving unit into a two-dimensional map. FIG. 2A is a binarized image of the dark defect of the two-dimensional map detected by the first light receiving unit, where the part indicated by the arrow in the figure is a foreign substance mixed in the film or surface contamination, Foreign matter adhering to the surface. FIG. 2 (b) is a binarized image of a bright defect of the two-dimensional map detected by the second light receiving unit, which is displayed by detecting only the foreign matter adhering to the surface. It was confirmed that nothing was detected as intended at the site where foreign matter or surface contamination was present.

そして、第1受光部と第2受光部のそれぞれの欠陥検出データを信号処理装置で照合することにより、実欠陥と付着異物とを確実に検出して判別できたことを確認した。   Then, by verifying the defect detection data of the first light receiving unit and the second light receiving unit with the signal processing device, it was confirmed that the actual defect and the adhered foreign material could be reliably detected and discriminated.

1 第1受光部
2 第2受光部
3 投光部
4 信号処理部
5 エンコーダ
W シート状物
A シート状物の走行方向
T シート状物の表面の付着異物
DESCRIPTION OF SYMBOLS 1 1st light-receiving part 2 2nd light-receiving part 3 Light projection part 4 Signal processing part 5 Encoder W Sheet-like object A Travel direction of sheet-like object T Adhering foreign material on the surface of sheet-like object

Claims (5)

走行する透明体シート状物の欠陥検査装置において、走行方向に対して斜めからシート状物の幅方向をライン状に照明する投光部と、シート状物を透過した照明光を投光部と反対側に配置して検出する第1受光部と、投光部から照明された照明光によって拡散または散乱した光を暗視野の方向に配置して検出する第2受光部と、第1受光部の検出データと第2受光部の検出データとを照合することによって、シート状物の欠陥が表面に付着した異物であるか、その他の欠陥であるかを判別する信号処理部とを、具備することを特徴とするシート状物の欠陥検査装置。   In a defect inspection apparatus for a transparent sheet material that travels, a light projecting unit that illuminates the width direction of the sheet material in a line form obliquely with respect to the traveling direction, and a light projecting unit that transmits illumination light transmitted through the sheet material A first light receiving unit arranged on the opposite side for detection, a second light receiving unit for detecting light diffused or scattered by illumination light illuminated from the light projecting unit in the direction of the dark field, and a first light receiving unit And a signal processing unit for discriminating whether the defect of the sheet-like object is a foreign matter adhering to the surface or another defect by collating the detection data of the second light receiving unit with the detection data of the second light receiving unit. A defect inspection apparatus for a sheet-like material. 前記投光部において、光源は輝度が高く、指向性が強い状態の照明光とし、シート状物の表面に付着した異物によって、一部の照明光を拡散または散乱させることを特徴とする請求項1記載の欠陥検査装置。   The light projecting unit is characterized in that the light source is illumination light having a high luminance and strong directivity, and a part of the illumination light is diffused or scattered by a foreign matter attached to the surface of the sheet-like material. The defect inspection apparatus according to 1. 前記第1受光部は、一次元のイメージセンサカメラを用い、カメラのレンズの絞り値を高く調整することにより、照明光によるイメージセンサの飽和の防止と被写界深度の大きな光学系にすることを特徴とする請求項1または2記載の欠陥検査装置。   The first light receiving unit uses a one-dimensional image sensor camera and adjusts the aperture value of the lens of the camera to be high so as to prevent the image sensor from being saturated with illumination light and to provide an optical system with a large depth of field. The defect inspection apparatus according to claim 1 or 2. 前記第2受光部は、一次元のイメージセンサカメラを用い、シート状物の表面に付着した異物によって拡散または散乱した光を明欠陥として検出できるように、カメラのレンズの絞り値を低く調整することと、光源の輝度を調整することと、照明の光軸の角度を調整することと、輝度信号の明欠陥検出のしきい値とを適切に調整することを特徴とする請求項1〜3のいずれか1項に記載の欠陥検査装置。   The second light receiving unit uses a one-dimensional image sensor camera and adjusts the aperture value of the camera lens to be low so that the light diffused or scattered by the foreign matter attached to the surface of the sheet-like object can be detected as a bright defect. And adjusting the brightness of the light source, adjusting the angle of the optical axis of the illumination, and appropriately adjusting a threshold value for detecting a bright defect in the brightness signal. The defect inspection apparatus according to any one of the above. 前記信号処理部は、第1受光部におけるシート状物の暗欠陥と明欠陥の両方の検出データと、第2受光部におけるシート状物の明欠陥の検出データとを取り込み、第2受光部の検出データをシート状物の表面に付着した異物と判定し、第1受光部の検出データと第2受光部の検出データについてシート状物の走行方向と幅方向の座標を照合し、座標が一致しない第1受光部のみで検出したデータを実欠陥と判定することを特徴とする請求項1〜4のいずれか1項に記載の欠陥検査装置。   The signal processing unit takes in the detection data of both the dark defect and the bright defect of the sheet-like object in the first light receiving unit and the detection data of the bright defect of the sheet-like object in the second light receiving unit, The detection data is determined to be a foreign substance adhering to the surface of the sheet-like object, and the coordinates in the traveling direction and width direction of the sheet-like object are collated with respect to the detection data of the first light receiving unit and the detection data of the second light receiving unit, and the coordinates match 5. The defect inspection apparatus according to claim 1, wherein data detected only by the first light receiving unit that is not determined is determined as an actual defect.
JP2009068179A 2009-03-19 2009-03-19 Flaw inspection device for sheet-like article Pending JP2010223598A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014192334A1 (en) * 2013-05-30 2014-12-04 住友化学株式会社 Defect inspection apparatus, and production system of optical display device
JP2015219090A (en) * 2014-05-16 2015-12-07 三井金属計測機工株式会社 Transmission inspection device
KR20180037573A (en) * 2016-10-04 2018-04-12 오므론 가부시키가이샤 Sheet inspection apparatus
JP2021067622A (en) * 2019-10-28 2021-04-30 コニカミノルタ株式会社 Image inspection device and image forming apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014192334A1 (en) * 2013-05-30 2014-12-04 住友化学株式会社 Defect inspection apparatus, and production system of optical display device
JP2014234999A (en) * 2013-05-30 2014-12-15 住友化学株式会社 Defect inspection device and production system of optical display device
JP2015219090A (en) * 2014-05-16 2015-12-07 三井金属計測機工株式会社 Transmission inspection device
KR20180037573A (en) * 2016-10-04 2018-04-12 오므론 가부시키가이샤 Sheet inspection apparatus
KR101992288B1 (en) 2016-10-04 2019-06-24 오므론 가부시키가이샤 Sheet inspection apparatus
JP2021067622A (en) * 2019-10-28 2021-04-30 コニカミノルタ株式会社 Image inspection device and image forming apparatus

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