JP2015143648A - Lighting system for inspection, and inspection method using the lighting system - Google Patents

Lighting system for inspection, and inspection method using the lighting system Download PDF

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JP2015143648A
JP2015143648A JP2014017017A JP2014017017A JP2015143648A JP 2015143648 A JP2015143648 A JP 2015143648A JP 2014017017 A JP2014017017 A JP 2014017017A JP 2014017017 A JP2014017017 A JP 2014017017A JP 2015143648 A JP2015143648 A JP 2015143648A
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pattern image
stripe pattern
inspection
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boundary
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JP6233926B2 (en
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誠治 田林
Seiji Tabayashi
誠治 田林
誠 竹森
Makoto Takemori
誠 竹森
考治 吉井
Koji Yoshii
考治 吉井
和三 上中
Kazumi Uenaka
和三 上中
啓彰 神澤
Hiroaki Kanzawa
啓彰 神澤
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Daihatsu Motor Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To efficiently detect all defects including a defect such as streaks, which are difficult to detect, as much as possible in a single step.SOLUTION: A lighting system 10 for inspection according to the present invention is a lighting system for projecting, on an inspection target surface 1, a stripe pattern image 21 in which a plurality of bright parts 19 and dark parts 20 are alternately arranged. In the stripe pattern image 21, one bright part 19 selected from the plurality of bright parts 19 and one dark part 20 adjacent thereto have a linear boundary 22 formed therebetween, and one bright part 19 and the other dark part 20 adjacent thereto on the opposite side of one dark part 20 have a curved boundary 23 formed therebetween.

Description

本発明は、検査用照明装置及びこの照明装置を用いた検査方法に関する。   The present invention relates to an inspection illumination device and an inspection method using the illumination device.

例えば自動車用ボデーの塗装ラインにおいては、塗装後に、塗装面に生じたブツやカス等と呼ばれる塗装欠陥の有無を検出する検査工程が設けられている。検査工程では、移動中のボデーに対して縦縞模様のストライプパターン像を投影し、このストライプパターン像をブツ等の欠陥が通過する際の特有の反射態様を作業者が視認することにより、当該欠陥を検出するようになっている。このストライプパターン像は、例えば蛍光灯等の照明部材を一定間隔で平行に配列し、所定の照度の光を照射することにより、照明部材に対向する位置を通過するボデーに投影している(例えば、特許文献1を参照)。   For example, an automobile body painting line is provided with an inspection process for detecting the presence or absence of coating defects such as blisters and debris generated on the painted surface after painting. In the inspection process, a stripe pattern image of a vertical stripe pattern is projected on the moving body, and an operator visually recognizes a specific reflection mode when a defect such as a bump passes through the stripe pattern image. Is supposed to be detected. This stripe pattern image is projected onto a body that passes through a position facing the illumination member by, for example, arranging illumination members such as fluorescent lamps in parallel at regular intervals and irradiating light with a predetermined illuminance (for example, , See Patent Document 1).

特開2003−215049号公報JP 2003-215049 A

ところで、塗装欠陥の1つに、スジと呼ばれる欠陥がある。この欠陥は線状をなすものであり、ブツなどに比べてその幅寸法や高さ寸法は小さい。そのため、ストライプパターン像を通過した際の光の反射度合いは小さく、検出することが難しい。加えて、上述したストライプパターン像の投影を利用した検査方法の場合、ストライプパターン像を構成する明部の長手方向とボデーの進行方向とが直交するように、蛍光灯等を配置するのが一般的であるため、スジの位置や明部に対する角度によっては反射量が非常に小さく、熟練の作業者といえども視認することが非常に難しい、との問題があった。   By the way, one of the coating defects is a defect called a streak. This defect has a linear shape, and its width and height are smaller than those of dents and the like. For this reason, the degree of reflection of light when passing through the stripe pattern image is small and difficult to detect. In addition, in the case of the inspection method using the projection of the stripe pattern image described above, it is common to arrange a fluorescent lamp or the like so that the longitudinal direction of the bright part constituting the stripe pattern image and the traveling direction of the body are orthogonal to each other. Therefore, there is a problem that the amount of reflection is very small depending on the position of the streak and the angle with respect to the bright part, and it is very difficult for even a skilled worker to visually recognize.

具体的に図面を参照して説明する。まず図9に示すように、ボデーの塗装面1上に存在するスジ3がストライプパターン像121の明部119と平行である場合、ボデーの進行に伴いスジ3が明部119に接近すると、その全長にわたってスジ3が反射する。そのため、ブツ等に比べて反射量が小さくても、明部119を通過する際の明度の変化(反射)の範囲3aが大きく、作業者はこの変化を比較的容易に視認することができる(よって検出はそれほど困難ではない)。   This will be specifically described with reference to the drawings. First, as shown in FIG. 9, when the streak 3 existing on the painted surface 1 of the body is parallel to the bright part 119 of the stripe pattern image 121, when the streak 3 approaches the bright part 119 as the body progresses, The streak 3 is reflected over the entire length. For this reason, even if the amount of reflection is smaller than that of blisters or the like, the range 3a of lightness change (reflection) when passing through the bright part 119 is large, and the operator can visually recognize this change relatively easily ( Therefore, detection is not so difficult).

一方、スジ3がストライプパターン像121の明部119と一定の角度をなして交差する(特に図10に示すように直交する)場合、ボデーの進行に伴い、スジ3が明部119に接近すると、その長手方向ではなく幅方向(長手方向に直交する向き。本明細書において以下同じ。)の範囲で反射が生じる。そのため、スジ3が明部119と平行に存在する場合に比べて、明部119を通過する際の明度の変化(反射)の範囲は小さく、作業者はこの変化を視認することがほとんどできない。また、スジ3が明部119と直交する場合、スジ3は通常、その幅方向中央を頂部として凸状をなすことから、スジ3が明部119と直交する向きに接近した際、スジ3に向けて照射された光は幅方向(図10の上下方向)に分散し易い傾向にある。この点においても、作業者は明度の変化を視認することがほとんどできない。   On the other hand, when the streak 3 intersects with the bright part 119 of the stripe pattern image 121 at a certain angle (especially orthogonal as shown in FIG. 10), the streak 3 approaches the bright part 119 as the body progresses. Reflection occurs in the range of the width direction (direction perpendicular to the longitudinal direction; the same applies hereinafter in this specification), not the longitudinal direction. Therefore, compared to the case where the streak 3 exists in parallel with the bright part 119, the range of the change in brightness (reflection) when passing through the bright part 119 is small, and the operator can hardly visually recognize this change. Further, when the streak 3 is orthogonal to the bright part 119, the streak 3 usually has a convex shape with the center in the width direction as the top, so when the streak 3 approaches the direction orthogonal to the bright part 119, the streak 3 The light emitted toward the surface tends to be easily dispersed in the width direction (vertical direction in FIG. 10). In this respect as well, the operator can hardly see the change in brightness.

以上の理由より、従来の検査方法では、ブツ等の欠陥を検出するための工程とは別に、スジを検出するための専用の工程を別に設ける必要があり、これにより検査工数の増加を招いていた。   For the above reasons, in the conventional inspection method, it is necessary to provide a dedicated process for detecting streaks separately from the process for detecting defects such as blisters, which increases the number of inspection processes. It was.

以上の事情に鑑み、本発明により解決すべき課題は、スジの如き検出困難な欠陥を含め、極力全ての欠陥を1つの工程で効率よく検出することにある。   In view of the above circumstances, the problem to be solved by the present invention is to detect all defects as efficiently as possible, including defects that are difficult to detect, such as streaks.

前記課題の解決は、本発明に係る検査用照明装置によって達成される。すなわち、この照明装置は、複数本の明部及び暗部を交互に配列してなるストライプパターン像を被検査面に投影するための検査用照明装置において、ストライプパターン像は、複数本の明部の中から選択される一の明部とこれに隣接する一方の暗部との間に直線状の境界を形成し、一方の暗部とは反対側で隣接する他方の暗部との間に曲線状の境界を形成する点をもって特徴付けられる。なお、ここでいう「直線状」及び「曲線状」とは、上記形態のストライプパターン像を、完全に平坦な平面としての被検査面に投影した際に得られる形態を意味するものであり、実際の検査面に投影した際の形態と必ずしも一致するものではない。   The solution to the above problem is achieved by the inspection illumination device according to the present invention. That is, this illumination device is an inspection illumination device for projecting a stripe pattern image formed by alternately arranging a plurality of bright portions and dark portions onto a surface to be inspected, and the stripe pattern image includes a plurality of bright portions. A straight boundary is formed between one bright portion selected from the inside and one dark portion adjacent thereto, and a curved boundary between the other dark portion adjacent to the other dark portion It is characterized by the point that forms. The “linear” and “curved” as used herein mean a form obtained when the stripe pattern image of the above form is projected onto a surface to be inspected as a completely flat plane, It does not necessarily match the form when projected onto the actual inspection surface.

上述のように、本発明では、従来、直線状の境界のみであった明暗のストライプパターン像に関し、複数本の明部の中から選択された1本の明部とこれに隣接する一方の暗部との境界を直線状とし、かつ一方の暗部とは反対側で隣接する他方の暗部との境界を曲線状に形成したことを特徴とする。このような形態のストライプパターン像を用いて欠陥の検出を行う場合の利点を、塗装欠陥の検出を行う場合を例にとって以下説明する。図5は、塗装欠陥の1つであるスジ3がストライプパターン像21を構成する明部19又は暗部20の長手方向に対して大きな角度をもって交差(図示例では直交)する場合を示している。このように、ボデーの塗装面1が、ボデーの移動に伴い、ストライプパターン像21を通過する場合において、塗装面1上に存在するスジ3は、直線状をなす境界22だけでなく曲線状をなす境界23も通過する。この際、曲線状の境界23は、その長手方向位置によって接線方向が異なる。そのため、明部19又は暗部20と大きな角度で交差するスジ3が曲線状の境界23を通過する際、当該通過領域とスジ3との交差角度が仮に小さくなかったとしても、その近傍には、高い確率で、スジ3との交差角度が比較的小さい(平行に近い)領域が存在する。よって、このスジ3との交差角度が比較的小さい領域により、暗部20に至ったスジ3が反射し易くなる(反射の度合いが大きくなる)。また、その変化(反射)の範囲3aも従来(直線状の境界22を通過する際)に比べて大きくなる。よって、曲線状の境界23を通過する際の反射を利用して、スジ3の如き欠陥を比較的容易に検出することが可能になる。また、本発明に係るストライプパターン像21は、曲線状の境界23だけでなく直線状の境界22を兼備しているので、ブツ4や、明部19と平行なスジ3など、曲線状の境界23だけでは検出し難い欠陥もこの直線状の境界22を通過した際の反射により確実に検出することができる(後述する図6及び図7を参照)。従って、想定されるほぼ全ての欠陥を検出することができ、これにより不具合が後工程に流出する可能性を低減し、ひいては品質の向上を図ることが可能となる。また、想定されるほぼ全ての欠陥を1つのストライプパターン像を利用して検出することができるので、検査工程は1つで足り、これにより検査工数の低減化を図ることが可能となる。   As described above, the present invention relates to a bright and dark stripe pattern image that has conventionally been only a linear boundary, and one bright portion selected from a plurality of bright portions and one dark portion adjacent thereto. And a boundary with the other dark part adjacent on the opposite side to one dark part is formed in a curved line. An advantage of detecting a defect using a stripe pattern image of such a form will be described below by taking a case of detecting a coating defect as an example. FIG. 5 shows a case where the stripe 3 which is one of the coating defects intersects with a large angle (orthogonal in the illustrated example) with respect to the longitudinal direction of the bright part 19 or the dark part 20 constituting the stripe pattern image 21. Thus, when the painted surface 1 of the body passes through the stripe pattern image 21 as the body moves, the streak 3 existing on the painted surface 1 has not only a straight boundary 22 but also a curved shape. The formed boundary 23 also passes. At this time, the tangential direction of the curved boundary 23 differs depending on the position in the longitudinal direction. Therefore, when the stripe 3 that intersects the bright portion 19 or the dark portion 20 at a large angle passes through the curved boundary 23, even if the intersection angle between the passage region and the stripe 3 is not small, With a high probability, there is a region where the angle of intersection with the stripe 3 is relatively small (close to parallel). Therefore, the streak 3 reaching the dark part 20 is easily reflected by the region where the intersection angle with the streak 3 is relatively small (the degree of reflection increases). Further, the change (reflection) range 3a is also larger than in the conventional case (when passing through the linear boundary 22). Therefore, it becomes possible to detect a defect such as the streak 3 relatively easily by using reflection when passing through the curved boundary 23. Further, since the stripe pattern image 21 according to the present invention has not only the curved boundary 23 but also the linear boundary 22, the curved boundary such as the stripe 4 or the stripe 3 parallel to the bright portion 19 is used. Defects that are difficult to detect with only 23 can be reliably detected by reflection when passing through the linear boundary 22 (see FIGS. 6 and 7 to be described later). Therefore, it is possible to detect almost all possible defects, thereby reducing the possibility that a defect will flow out to a subsequent process, thereby improving the quality. In addition, since almost all possible defects can be detected by using one stripe pattern image, only one inspection process is required, thereby reducing the number of inspection steps.

特に、検査対象が自動車用ボデーの塗装面の場合、想定されるスジやブツ等の塗装欠陥については、ある程度そのサイズが決まっている。そのため、これらの欠陥がストライプパターン像の明部に埋もれてしまわないよう、明部に比べて暗部の幅寸法を大きくとる傾向にある。ここで、作業者が塗装面上の欠陥を目視で検出するに際して、作業者が一度に視認できる範囲はそれほど大きくない(数十センチ四方レベル)。そのため、複数本の明部の中から選択される1つの明部の一方側に直線状の境界を形成し、他方側に曲線状の境界を形成した構成をとることで、仮に、作業者の視界(一度に視認できる範囲)が1本の明部のみを含む程度であったとしても、当該1本の明部を通過するほぼ全ての塗装欠陥を確実に検出することができる。よって、作業者の検出効率(検出速度)を落とすことなく塗装欠陥の検出精度を高めることが可能となる。   In particular, when the object to be inspected is a painted surface of an automobile body, the size of the expected coating defects such as streaks and irregularities is determined to some extent. Therefore, the width dimension of the dark part tends to be larger than that of the bright part so that these defects are not buried in the bright part of the stripe pattern image. Here, when an operator visually detects a defect on the painted surface, the range that the operator can visually recognize at a time is not so large (a level of several tens of centimeters). Therefore, by adopting a configuration in which a linear boundary is formed on one side of one bright part selected from the plurality of bright parts and a curved boundary is formed on the other side, Even if the field of view (range that can be viewed at a time) includes only one bright part, almost all coating defects that pass through the single bright part can be reliably detected. Therefore, it becomes possible to improve the detection accuracy of the coating defect without reducing the detection efficiency (detection speed) of the worker.

また、本発明に係る検査用照明装置は、曲線状の境界が、波状に湾曲した形状をなすものであってもよい。   Further, the inspection illumination device according to the present invention may be one in which a curved boundary forms a wave shape.

上述のように、曲線状の境界を、波状に湾曲した形状とすれば、比較的短い長手寸法の範囲内に、できる限り多くの接線角度を有する境界を形成することができる。そのため、スジの如き欠陥が曲線状の境界のどの位置(長手方向位置)を通過した場合であっても、当該欠陥の延伸方向との交差角度が小さい(平行に近い)境界の一部領域が通過領域の近傍に存在するような状況を非常に高い確率で再現することができる。よって、明部や暗部の長手方向と直交する向きのスジの検出確率をさらに高めることが可能となる。   As described above, if the curved boundary is a wave-like curved shape, a boundary having as many tangent angles as possible can be formed within a relatively short longitudinal dimension. Therefore, even if a defect such as a streak passes through any position (longitudinal position) on the curved boundary, a partial region of the boundary where the intersection angle with the extending direction of the defect is small (near parallel) is A situation that exists in the vicinity of the passing region can be reproduced with a very high probability. Therefore, it is possible to further increase the detection probability of the streak in the direction orthogonal to the longitudinal direction of the bright part and the dark part.

また、本発明に係る検査用照明装置は、協働によりストライプパターン像を形成する複数の照明部材を備え、各々の照明部材に設けられた発光面の幅方向一方側の縁部が直線状をなし、他方側の縁部が曲線状をなすものであってもよい。   In addition, the inspection illumination device according to the present invention includes a plurality of illumination members that form a stripe pattern image in cooperation with each other, and an edge portion on one side in the width direction of the light emitting surface provided in each illumination member is linear. None, the other edge may be curved.

このように、ストライプパターン像を複数の照明部材で構成することで、各照明部材をユニット化(モジュール化)することができる。ユニット化できれば、被検査面(を有する物体)の形状に合わせて各照明部材の配置を比較的自由に調整できるので、汎用性が高まる。また、発光面の形状が互いに異なる2種以上の照明部材を用意すれば容易にストライプパターン像のバリエーションを増やせるので、ストライプパターン像の自由度も高まる。さらに、各々の照明部材に設けられた発光面を、その幅方向一方側の縁部が直線状をなし、他方側の縁部が曲線状をなす形状としたので、各照射部材の発光面から被検査面に向けて照射された光をできる限り無駄なくストライプパターン像の形成に用いることができる。よって、検査工程のエネルギー効率を高めて省エネルギー化を図ることが可能になる。   In this way, by configuring the stripe pattern image with a plurality of illumination members, each illumination member can be unitized (modularized). If it can be unitized, the arrangement of each illumination member can be adjusted relatively freely in accordance with the shape of the surface to be inspected (having the object), so versatility is enhanced. Moreover, if two or more kinds of illumination members having different light emitting surface shapes are prepared, the variation of the stripe pattern image can be easily increased, and the degree of freedom of the stripe pattern image is also increased. Furthermore, since the light emitting surface provided in each illumination member has a shape in which the edge on one side in the width direction forms a straight line and the edge on the other side forms a curve, the light emitting surface of each irradiation member The light irradiated toward the surface to be inspected can be used for forming a stripe pattern image without waste as much as possible. Therefore, it becomes possible to improve energy efficiency of the inspection process and save energy.

また、前記課題の解決は、本発明に係る検査用照明装置を用いた検査方法によっても達成される。すなわち、この検査方法は、複数本の明部及び暗部を交互に配列してなるストライプパターン像を被検査面に投影しながらストライプパターン像と直交する向きに被検査面を移動させることで、被検査面上の欠陥を検出するための検査方法において、ストライプパターン像として、複数本の明部の中から選択される一の明部とこれに隣接する一方の暗部との間に直線状の境界を形成し、一方の暗部とは反対側で隣接する他方の暗部との間に曲線状の境界を形成するものを用いる点をもって特徴付けられる。   Moreover, the solution of the above-described problem can be achieved by an inspection method using the inspection illumination device according to the present invention. That is, in this inspection method, the surface to be inspected is moved in a direction perpendicular to the stripe pattern image while projecting a stripe pattern image formed by alternately arranging a plurality of bright portions and dark portions onto the surface to be inspected. In an inspection method for detecting a defect on an inspection surface, a linear boundary between one bright portion selected from a plurality of bright portions and one dark portion adjacent thereto as a stripe pattern image And is characterized by using a material that forms a curvilinear boundary with the other dark part adjacent to the other dark part.

この検査方法によれば、上述した本発明に係る検査用照明装置と同様に、例えば塗装欠陥の検出を行う場合、明部19又は暗部20の長手方向と大きな角度で交差するスジ3が曲線状の境界23を通過する際、当該通過領域とスジ3との交差角度が仮に小さくなかったとしても、その近傍には、高い確率で、スジ3との交差角度が比較的小さい(平行に近い)領域が存在する(図5)。よって、このスジ3との交差角度が比較的小さい領域により、暗部20に至ったスジ3が反射し易くなる(反射の度合いが大きくなる)。また、その変化(反射)の範囲3aも従来(直線状の境界22を通過する際)に比べて大きくなる。よって、曲線状の境界23を通過する際の反射を利用して、スジ3の如き欠陥を比較的容易に検出することが可能になる。また、本発明に係るストライプパターン像21は、曲線状の境界23だけでなく直線状の境界22を兼備しているので、ブツ4や、明部19と平行なスジ3など、曲線状の境界23だけでは検出し難い欠陥もこの直線状の境界22を通過した際の反射により確実に検出することができる(図6及び図7)。従って、想定されるほぼ全ての欠陥を検出することができ、これにより不具合が後工程に流出する可能性を低減し、ひいては品質の向上を図ることが可能となる。また、想定されるほぼ全ての欠陥を1つのストライプパターン像を利用して検出することができるので、検査工程は1つで足り、これにより検査工数の低減化を図ることが可能となる。   According to this inspection method, as in the above-described inspection illumination device according to the present invention, for example, when a coating defect is detected, the streak 3 that intersects with the longitudinal direction of the bright part 19 or the dark part 20 at a large angle is curved. Even when the crossing angle between the passing region and the streak 3 is not small when passing through the boundary 23, the crossing angle with the streak 3 is relatively small (near parallel) with high probability in the vicinity. A region exists (FIG. 5). Therefore, the streak 3 reaching the dark part 20 is easily reflected by the region where the intersection angle with the streak 3 is relatively small (the degree of reflection increases). Further, the change (reflection) range 3a is also larger than in the conventional case (when passing through the linear boundary 22). Therefore, it becomes possible to detect a defect such as the streak 3 relatively easily by using reflection when passing through the curved boundary 23. Further, since the stripe pattern image 21 according to the present invention has not only the curved boundary 23 but also the linear boundary 22, the curved boundary such as the stripe 4 or the stripe 3 parallel to the bright portion 19 is used. Defects that are difficult to detect with only 23 can be reliably detected by reflection when passing through the linear boundary 22 (FIGS. 6 and 7). Therefore, it is possible to detect almost all possible defects, thereby reducing the possibility that a defect will flow out to a subsequent process, thereby improving the quality. In addition, since almost all possible defects can be detected by using one stripe pattern image, only one inspection process is required, thereby reducing the number of inspection steps.

以上のように、本発明によれば、スジの如き検出困難な欠陥を含め、極力全ての欠陥を1つの工程で効率よく検出することができる。   As described above, according to the present invention, it is possible to detect all defects as efficiently as possible, including defects that are difficult to detect such as streaks, in one process.

本発明の一実施形態に係る検査用照明装置の側面図である。It is a side view of the illuminating device for inspection which concerns on one Embodiment of this invention. 図1に示す照明装置の正面図である。It is a front view of the illuminating device shown in FIG. 図1に示す照明装置に設けられた照明部材の全体形状を示す斜視図である。It is a perspective view which shows the whole illumination member shape provided in the illuminating device shown in FIG. 図3に示す照明部材の発光面を平面視した図である。It is the figure which planarly viewed the light emission surface of the illuminating member shown in FIG. 図1に示す照明装置を用いた検査方法の一例を説明するための図であって、被検査面に投影されたストライプパターン像と被検査面上の欠陥との明暗関係を示す図である。It is a figure for demonstrating an example of the inspection method using the illuminating device shown in FIG. 1, Comprising: It is a figure which shows the light-dark relationship between the stripe pattern image projected on the to-be-inspected surface, and the defect on to-be-inspected surface. 図1に示す照明装置を用いた検査方法の一例を説明するための図であって、被検査面に投影されたストライプパターン像と被検査面上の欠陥との明暗関係を示す図である。It is a figure for demonstrating an example of the inspection method using the illuminating device shown in FIG. 1, Comprising: It is a figure which shows the light-dark relationship between the stripe pattern image projected on the to-be-inspected surface, and the defect on to-be-inspected surface. 図1に示す照明装置を用いた検査方法の一例を説明するための図であって、被検査面に投影されたストライプパターン像と被検査面上の欠陥との明暗関係を示す図である。It is a figure for demonstrating an example of the inspection method using the illuminating device shown in FIG. 1, Comprising: It is a figure which shows the light-dark relationship between the stripe pattern image projected on the to-be-inspected surface, and the defect on to-be-inspected surface. 本発明の他の実施形態に係る検査用照明装置を用いた場合に、被検査面に投影されたストライプパターン像と被検査面上の欠陥との明暗関係を示す図である。It is a figure which shows the brightness-and-darkness relationship between the stripe pattern image projected on the to-be-inspected surface, and the defect on the to-be-inspected surface when using the inspection illumination device according to another embodiment of the present invention. 従来の検査用照明装置を用いた場合に、被検査面に投影されたストライプパターン像と被検査面上の欠陥との明暗関係を示す図である。It is a figure which shows the light-dark relationship between the stripe pattern image projected on the to-be-inspected surface, and the defect on the to-be-inspected surface when the conventional illumination device for an inspection is used. 従来の検査用照明装置を用いた場合に、被検査面に投影されたストライプパターン像と被検査面上の欠陥との明暗関係を示す図である。It is a figure which shows the light-dark relationship between the stripe pattern image projected on the to-be-inspected surface, and the defect on the to-be-inspected surface when the conventional illumination device for an inspection is used.

以下、本発明の一実施形態に係る検査用照明装置及びこの照明装置を用いた検査方法 を図面に基づき説明する。なお、本実施形態では、自動車用ボデーの塗装面を検査対象 (被検査面)とする場合を例にとって説明する。     Hereinafter, an inspection illumination device and an inspection method using the illumination device according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a case where the painted surface of the automobile body is an inspection target (surface to be inspected) will be described as an example.

図1及び図2は、本発明の一実施形態に係る検査用照明装置10の全体構成を示している。図1及び図2に示すように、この照明装置10は、被検査面としての塗装面1を有する部材(本実施形態では自動車用ボデー2)が通過可能な通路11の側方及び上方を覆うカバー部材12と、カバー部材12の内側に取付けられた複数の照明部材13とを備える。本実施形態では、自動車用ボデー2は、支持部材14上に支持された状態で、通路11上を所定の方向(図1でいえば左方向)に向けて移動するようになっている。カバー部材12の全長(通路11の長手方向に沿った向きの寸法)は、例えば塗装面1を有する自動車用ボデー2の全長よりも大きく設定される。   1 and 2 show the overall configuration of an inspection illumination device 10 according to an embodiment of the present invention. As shown in FIGS. 1 and 2, the lighting device 10 covers the side and upper side of a passage 11 through which a member having a painted surface 1 as a surface to be inspected (a vehicle body 2 in the present embodiment) can pass. A cover member 12 and a plurality of illumination members 13 attached to the inside of the cover member 12 are provided. In the present embodiment, the automobile body 2 is moved on the passage 11 in a predetermined direction (leftward in FIG. 1) while being supported on the support member 14. The total length of the cover member 12 (the dimension in the direction along the longitudinal direction of the passage 11) is set larger than the total length of the automobile body 2 having the painted surface 1, for example.

照明部材13は、図3に示すように略長板状をなすもので、その長手方向が自動車用ボデー2の移動方向と直交するよう、カバー部材12の内側に取付けられる。本実施形態では、カバー部材12は略アーチ状の内周面12aを有しており、この内周面12aに沿って連続的に複数の照明部材13が配置されている(図2)。また、このように一列に取付けられた複数の照明部材13は、カバー部材12の長手方向全域にわたって、一定の間隔で複数列に配置されている(図1)。   The illumination member 13 has a substantially long plate shape as shown in FIG. 3, and is attached to the inside of the cover member 12 so that the longitudinal direction thereof is orthogonal to the moving direction of the automobile body 2. In this embodiment, the cover member 12 has a substantially arch-shaped inner peripheral surface 12a, and a plurality of illumination members 13 are continuously arranged along the inner peripheral surface 12a (FIG. 2). In addition, the plurality of illumination members 13 attached in a row in this way are arranged in a plurality of rows at regular intervals over the entire longitudinal direction of the cover member 12 (FIG. 1).

各照明部材13は、図3に示すように、ケーシング15と、ケーシング15の内部に収容される発光源16とを有する。ケーシング15の少なくとも発光面15aを含む部位は透過性を有する材料で形成されており、この発光面15aに向けて発光可能なように発光源16が配置される。発光源16としてはLED等の指向性に優れたものが好適であり、特定の指向性を有する場合には発光面15aを直交する向きに発光源16を配置するのがよい。これにより、発光源16から発光された光を発光面15aの法線方向にかつ極力発光面15aの全面から透過可能としている。もちろん、発光面15aから発光された光が所定の指向性を保ったままで塗装面1にまで到達することを考慮した場合、発光面15aはなるべく平坦であるのがよい。   As shown in FIG. 3, each lighting member 13 includes a casing 15 and a light emission source 16 accommodated in the casing 15. The part including at least the light emitting surface 15a of the casing 15 is formed of a transmissive material, and the light emitting source 16 is disposed so as to emit light toward the light emitting surface 15a. As the light source 16, an LED or the like having excellent directivity is suitable. When the light source 16 has a specific directivity, the light source 16 is preferably arranged in a direction orthogonal to the light emitting surface 15 a. Thereby, the light emitted from the light emitting source 16 can be transmitted in the normal direction of the light emitting surface 15a and from the entire surface of the light emitting surface 15a as much as possible. Of course, considering that the light emitted from the light emitting surface 15a reaches the coating surface 1 while maintaining a predetermined directivity, the light emitting surface 15a is preferably as flat as possible.

発光面15aは、これを平面視した状態では、その幅方向(図4でいえば左右方向)一方側の縁部17が直線状をなし、他方側の縁部18が曲線状をなす。本実施形態では、曲線状の縁部18は、波状に湾曲した形状をなすもので、例えば各々の曲率中心をこの縁部18の内側と外側とにそれぞれ配置した円弧を交互に連続させた形状をなしている。また、それぞれの円弧の円弧長は同じ長さに設定されると共に、その曲率半径R1,R2も同じ大きさに設定されている。   In the state of viewing the light emitting surface 15a in plan view, the edge 17 on one side in the width direction (left and right in FIG. 4) is linear, and the edge 18 on the other side is curved. In the present embodiment, the curved edge 18 has a wave-like curved shape, for example, a shape in which arcs in which the respective centers of curvature are arranged on the inner side and the outer side of the edge 18 are alternately continued. I am doing. The arc lengths of the respective arcs are set to the same length, and the radii of curvature R1 and R2 are also set to the same size.

以下、上記構成の検査用照明装置10を用いた検査方法の一例を主に図5〜図7に基づき説明する。   Hereinafter, an example of an inspection method using the inspection illumination device 10 having the above-described configuration will be mainly described with reference to FIGS.

まず、図1に示すように、カバー部材12の内周に設けられた通路11に塗装面1を有する自動車用ボデー2を進入させる。そして、カバー部材12の内周を通過中の自動車用ボデー2に対して複数の照明部材13から所定の照度の光を照射することにより、自動車用ボデー2の移動方向に直交する向きに伸びるライン状の明部19が一定の間隔で塗装面1に投影される(図5を参照)。塗装面1のうち照射光が照射されない領域には、カバー部材12の内周面12aが映り込むので、この内周面12aを暗色とすることで、内周面12aのうち照明部材13が取付けられていない領域(背景部)が暗部20として塗装面1に投影される(図5)。以上より、通路11を通過中の自動車用ボデー2に、明暗の縦縞模様をなすストライプパターン像21が投影される(図5)。   First, as shown in FIG. 1, an automobile body 2 having a painted surface 1 is made to enter a passage 11 provided on the inner periphery of the cover member 12. A line extending in a direction orthogonal to the moving direction of the automobile body 2 by irradiating the automobile body 2 passing through the inner periphery of the cover member 12 with light having a predetermined illuminance from the plurality of illumination members 13. The bright portions 19 are projected onto the coating surface 1 at regular intervals (see FIG. 5). Since the inner peripheral surface 12a of the cover member 12 is reflected in a region of the painted surface 1 where the irradiation light is not irradiated, the illumination member 13 is attached to the inner peripheral surface 12a by darkening the inner peripheral surface 12a. A region (background portion) that is not formed is projected onto the painted surface 1 as a dark portion 20 (FIG. 5). As described above, the stripe pattern image 21 forming a bright and dark vertical stripe pattern is projected onto the vehicle body 2 passing through the passage 11 (FIG. 5).

ここで、塗装面1上にスジ3と呼ばれる塗装欠陥が存在し、かつこのスジ3が明部19又は暗部20の長手方向と大きな角度をもって交差する場合、自動車用ボデー2の移動に伴い(図1)、塗装面1上のスジ3はストライプパターン像21の明部19及び暗部20と直交する向きに、これら明部19と暗部20とを交互に通過する。スジ3のうち明部19と暗部20との間に形成される直線状の境界22を通過する直前の部位においては、その長手方向ではなく幅方向(図5でいえば上下方向)の範囲で反射が生じる。そのため、明部19を通過する際の明度の変化(反射)の範囲3aは小さく、作業者がこの変化を視認することは極めて難しい。   Here, when there is a coating defect called a streak 3 on the painted surface 1 and this streak 3 intersects with the longitudinal direction of the bright part 19 or the dark part 20 with a large angle, the vehicle body 2 moves (see FIG. 1) The streaks 3 on the painted surface 1 alternately pass through the bright portions 19 and the dark portions 20 in a direction orthogonal to the bright portions 19 and the dark portions 20 of the stripe pattern image 21. In the part immediately before passing the linear boundary 22 formed between the bright part 19 and the dark part 20 in the stripe 3, it is not in the longitudinal direction but in the range in the width direction (up and down direction in FIG. 5). Reflection occurs. Therefore, the range 3a of the change in brightness (reflection) when passing through the bright part 19 is small, and it is extremely difficult for the operator to visually recognize this change.

これに対して、スジ3が明部19と暗部20との間に形成される曲線状の境界23を通過する際には、当該通過領域とスジ3との交差角度が仮に小さくなかったとしても、その近傍には、高い確率で、スジ3との交差角度が比較的小さい(平行に近い)領域が存在する。よって、このスジ3との交差角度が比較的小さい領域により、スジ3の長手方向の大部分において反射が生じる。また、この際の明度の変化(反射)の範囲3aも比較的大きくなる。よって、作業者はこの変化を比較的容易に視認することができ、これによりスジ3の検出確率が高まる。   On the other hand, when the stripe 3 passes through the curved boundary 23 formed between the bright portion 19 and the dark portion 20, even if the intersection angle between the passage region and the stripe 3 is not small. In the vicinity thereof, there is a region where the intersection angle with the stripe 3 is relatively small (close to parallel) with high probability. Therefore, reflection occurs in most of the longitudinal direction of the stripe 3 due to the region where the angle of intersection with the stripe 3 is relatively small. Also, the brightness change (reflection) range 3a at this time is relatively large. Therefore, the operator can visually recognize this change relatively easily, thereby increasing the detection probability of the streak 3.

また、スジ3が明部19又は暗部20の長手方向と平行又は平行に近い状態で存在する場合、ボデーの進行に伴い、スジ3が明部19と暗部20との間に形成される直線状の境界22に接近すると、その全長にわたってスジ3が反射する(図6を参照)。このように、明部19を通過する際の明度の変化(反射)の範囲3aが大きい場合も、作業者はこの変化を比較的容易に視認することができる。   Further, when the streak 3 exists in a state parallel or nearly parallel to the longitudinal direction of the bright part 19 or the dark part 20, the streak 3 is a straight line formed between the bright part 19 and the dark part 20 as the body progresses. When the boundary 22 is approached, the streak 3 is reflected over the entire length (see FIG. 6). Thus, even when the range 3a of the change in brightness (reflection) when passing through the bright part 19 is large, the operator can visually recognize this change relatively easily.

また、塗装面1上にブツ4と呼ばれる塗装欠陥が存在する場合、ボデーの進行に伴い、ブツ4が明部19と暗部20との間に形成される直線状の境界22に接近すると、ブツ4のうち特に直線状の境界22に近い部分4aが大きく反射する(図7を参照)。そのため、ブツ4が明部19を通過する際の明度の変化(反射)の度合いは大きくなり、この場合も作業者はこの変化を比較的容易に視認することができる。   In addition, when there is a coating defect called “butsu 4” on the painted surface 1, as the body 4 progresses, the bush 4 approaches the linear boundary 22 formed between the bright portion 19 and the dark portion 20. A portion 4a of 4 that is particularly close to the linear boundary 22 is largely reflected (see FIG. 7). For this reason, the degree of change (reflection) in brightness when the brace 4 passes through the bright part 19 increases, and in this case as well, the operator can visually recognize this change relatively easily.

このように、本発明に係る検査用照明装置10によれば、明部19又は暗部20の長手方向と大きな角度で交差するスジ3が曲線状の境界23を通過する際、スジ3を広範囲にわたって反射させることができる。これによりスジ3を比較的容易に検出することが可能になる。また、本発明に係るストライプパターン像21は、曲線状の境界23だけでなく直線状の境界22を兼備しているので、明部19に直交するスジ3だけでなく、明部19に平行なスジ3やブツ4などの塗装欠陥も比較的容易に検出することができる。もちろん、これら欠陥よりもスケールレベルの大きな塗装面1自体が有する凹凸(うねり等)も直線状の境界22で検出することができる。従って、想定されるほぼ全ての欠陥を検出することができ、これにより不具合が後工程に流出する可能性を低減し、ひいては品質の向上を図ることが可能となる。また、想定されるほぼ全ての欠陥を1つのストライプパターン像21を利用して検出することができるので、検査工程は1つで足り、これにより検査工数の低減化を図ることが可能となる。   Thus, according to the inspection illumination device 10 according to the present invention, when the streak 3 that intersects the longitudinal direction of the bright part 19 or the dark part 20 at a large angle passes through the curved boundary 23, the streak 3 is spread over a wide range. Can be reflected. As a result, the streak 3 can be detected relatively easily. Further, since the stripe pattern image 21 according to the present invention has not only the curved boundary 23 but also the linear boundary 22, the stripe pattern image 21 is parallel to the bright portion 19 as well as the stripe 3 orthogonal to the bright portion 19. Paint defects such as streaks 3 and irregularities 4 can be detected relatively easily. Of course, the unevenness (swell or the like) of the painted surface 1 having a scale level larger than these defects can also be detected at the linear boundary 22. Therefore, it is possible to detect almost all possible defects, thereby reducing the possibility that a defect will flow out to a subsequent process, thereby improving the quality. In addition, since almost all possible defects can be detected using one stripe pattern image 21, only one inspection step is required, thereby reducing the number of inspection steps.

また、本実施形態では、曲線状の境界23として、波状に湾曲した形状をなすものを用いた。このような形状とすることで、明部19の比較的短い長手寸法の範囲内に、できる限り多くの接線角度を有する境界23を形成することができる。そのため、スジ3の如き欠陥が曲線状の境界23のどの位置(長手方向位置)を通過した場合であっても、当該欠陥の延伸方向との交差角度が小さい(平行に近い)境界の一部領域が通過領域の近傍に存在するような状況を非常に高い確率で再現することができる。よって、明部19や暗部20の長手方向と直交する向きのスジ3の検出確率をさらに高めることが可能となる。特に、実際の塗装欠陥を検出する工程においては、比較的短時間で多くの箇所を目視で検査しなければならない事情もあり、作業者が一度に視認できる範囲は非常に狭い(数十センチ四方レベル)。よって、曲線状の境界23を上述のような形状とすることは、検出確率を高める上で非常に有効である。   Further, in the present embodiment, the curved boundary 23 has a wave-like curved shape. By setting it as such a shape, the boundary 23 which has as many tangent angles as possible within the range of the comparatively short longitudinal dimension of the bright part 19 can be formed. Therefore, even if a defect such as a streak 3 passes through any position (longitudinal position) of the curved boundary 23, a part of the boundary where the intersection angle with the extending direction of the defect is small (near parallel) A situation in which a region exists in the vicinity of the passing region can be reproduced with a very high probability. Therefore, it is possible to further increase the detection probability of the streak 3 in the direction orthogonal to the longitudinal direction of the bright part 19 and the dark part 20. In particular, in the process of detecting actual coating defects, there are circumstances where many places must be visually inspected in a relatively short time, and the range that an operator can see at a time is very narrow (several tens of centimeters square level). Therefore, making the curved boundary 23 as described above is very effective in increasing the detection probability.

以上、本発明の一実施形態について述べたが、本発明は、その趣旨を逸脱しない範囲において、上記以外の構成を採ることも可能である。   As mentioned above, although one Embodiment of this invention was described, this invention can also take a structure other than the above in the range which does not deviate from the meaning.

例えば上記実施形態では、塗装面1に投影されるストライプパターン像21として、同一形状の曲線状の境界23が、一定の間隔で全く並列に配置された場合(図5)を例示したが、例えば明部19に直交する向きのスジ3の検出確率をさらに高める目的で、一列ごとに上下方向(明部19の長手方向)にずらして配置してもよい。図8はその一例を示すもので、曲線状の境界23を波状に見立てた場合、例えば4分の1波長分だけ中央の曲線状の境界23から上下何れかの方向(図8では上方向)に左右の曲線状の境界23’をずらした形態をなす。このような形態とするには、例えば照明部材13のカバー部材12内周における取付け位置を同じようにずらせばよい。こうすることで、仮に中央の曲線状の境界23でスジ3が当該境界23の山部頂点付近を通過したとしても、次の左側の曲線状の境界23’においては、その山部と谷部との間の傾斜領域を通過させることができる。これにより、通過する位置によらずスジ3をより広範囲で照らして(反射させて)検出確率をさらに高めることが可能になる。   For example, in the above embodiment, as the stripe pattern image 21 projected on the painting surface 1, the case where the curved boundary 23 having the same shape is arranged in parallel at a constant interval (FIG. 5) is exemplified. For the purpose of further increasing the detection probability of the streak 3 in the direction orthogonal to the bright part 19, the lines may be shifted in the vertical direction (longitudinal direction of the bright part 19) for each row. FIG. 8 shows an example. When the curved boundary 23 is regarded as a wave shape, for example, one quarter of the wavelength from the central curved boundary 23 by one-quarter wavelength (upward in FIG. 8). The left and right curved borders 23 'are shifted from each other. In order to achieve such a configuration, for example, the mounting position of the illumination member 13 on the inner periphery of the cover member 12 may be shifted in the same manner. In this way, even if the streak 3 passes near the peak of the peak of the boundary 23 at the center of the curved boundary 23, the peak and valley of the next left curved boundary 23 ' It is possible to pass through an inclined region between the two. This makes it possible to further increase the detection probability by illuminating (reflecting) the stripe 3 in a wider range regardless of the passing position.

なお、上記実施形態では、波状に湾曲した形状をなす曲線状の境界23として、同一半径の円弧をつなげたものを例示したが、もちろんこれ以外の形態を採ることも可能である。例えば曲率半径R1,R2が互いに異なる円弧をつなげた形態や、非円弧の凸曲線と凹曲線とを交互につなげた形態などが採用可能である。さらにいえば、直線部を交互に屈曲させて擬似的に波状としたものを採用しても構わない。   In the above-described embodiment, the curved boundary 23 having a wave-like shape is illustrated as connecting the circular arcs having the same radius. However, other forms may be adopted as a matter of course. For example, a form in which arcs having different radii of curvature R1 and R2 are connected, or a form in which non-arc convex curves and concave curves are alternately connected can be adopted. Furthermore, it may be possible to adopt a pseudo wave shape by alternately bending the straight portions.

また例えば、曲線状の境界23のスケールレベルに関して、実際の塗装欠陥を検出する工程においては、上述したように、比較的短時間で多くの箇所を目視で検査しなければならない事情もあり、作業者が一度に視認できる範囲は非常に狭い(数十センチ四方レベル)。一方、この種の塗装欠陥として想定されるスジ3やブツ4等のスケールもある程度分かっている。よって、これらの点を考慮して、曲線状の境界23のサイズ(長手方向、幅方向)を定めることが望ましい。長手方向のスケールレベルとしては、作業者が一度に視認できる範囲の中に、少なくとも1組の山部と谷部が含まれるよう、曲線状の境界23の曲率半径R1,R2を定まるのがよい。また、幅方向のスケールレベルとしては、作業者が一度に視認できる範囲の中に、少なくとも1組の直線状の境界22と曲線状の境界23が含まれるよう、好ましくは2組の直線状の境界22と曲線状の境界23が含まれるよう、曲線状の境界23の曲率半径R1,R2を含めた明部19の幅方向寸法と、暗部20の幅方向寸法を定めるのがよい。なお、ここでいう「作業者が一度に視認できる範囲」とは、その作業状況や検査条件(照度、自動車用ボデー2の移動速度など)によっても異なるが、例えば45センチ四方以下、より厳密には30センチ四方以下程度である。   Further, for example, in the process of detecting an actual coating defect with respect to the scale level of the curved boundary 23, as described above, there are circumstances in which many places must be visually inspected in a relatively short time. The range that a person can see at a time is very narrow (level of several tens of centimeters). On the other hand, scales such as streaks 3 and irregularities 4 that are assumed as this type of coating defect are also known to some extent. Therefore, it is desirable to determine the size (longitudinal direction and width direction) of the curved boundary 23 in consideration of these points. As the scale level in the longitudinal direction, the radii of curvature R1 and R2 of the curved boundary 23 should be determined so that at least one set of peaks and valleys is included in the range visible to the operator at a time. . Further, the scale level in the width direction is preferably two sets of linear boundaries so that at least one set of linear boundaries 22 and curved boundaries 23 are included in the range that the operator can view at a time. It is preferable to determine the width direction dimension of the bright part 19 and the width direction dimension of the dark part 20 including the curvature radii R1 and R2 of the curved boundary 23 so that the boundary 22 and the curved boundary 23 are included. Note that the “range that an operator can see at a time” here depends on the work situation and inspection conditions (illuminance, moving speed of the body 2 of the automobile, etc.), but is more strictly, for example, 45 cm square or less. Is about 30 cm square or less.

また、明部19の基準範囲(例えば作業者が一度に視認できる範囲)に対して占める割合は、特定の塗装欠陥が明部19に埋もれてしまわないよう、例えば面積比で30%以下、好ましくは25%以下に設定するのがよい。具体的には、隣接する直線状の境界22間の距離に対する明部19の幅方向寸法の割合が30%以下となるように、照明部材13の発光面15aの幅方向寸法、及び照明部材13の配置間隔を設定するのがよい。   In addition, the ratio of the bright portion 19 to the reference range (for example, a range that can be visually recognized by an operator at a time) is, for example, 30% or less in an area ratio so that a specific coating defect is not buried in the bright portion 19. Is preferably set to 25% or less. Specifically, the width direction dimension of the light emitting surface 15a of the illumination member 13 and the illumination member 13 so that the ratio of the width direction dimension of the bright portion 19 to the distance between the adjacent linear boundaries 22 is 30% or less. It is better to set the arrangement interval.

また、以上の説明では、ストライプパターン像21として、直線状の境界22と曲線状の境界23とが交互に配列されてなるものを例示したが、もちろん、これ以外の形態を成すストライプパターン像21を採用することも可能である。例えば図示は省略するが、図3に示す照明部材13を回転させて、直線状の境界22が2本続いた後、曲線状の境界23が2本続くような形態、すなわち、隣接する明部19,19間で両側の境界の形状が異なる(一方の明部19はその左側に直線状の境界22を形成し、他方の明部19はその右側に直線状の境界22を形成する)形態をなすストライプパターン像21を形成してもよい。あるいはこれも図示は省略するが、両縁部17,18が共に直線状をなす発光面15aを設けた照明部材13と、両縁部17,18が共に曲線状をなす発光面15aを設けた照明部材13とを用意して、その両側に直線状の境界22を形成する明部19と、その両側に曲線状の境界23を形成する明部19とが暗部20を介して交互に配列されるストライプパターン像19を形成してもよい。   In the above description, the stripe pattern image 21 has been exemplified in which the linear boundary 22 and the curved boundary 23 are alternately arranged. Of course, the stripe pattern image 21 has other forms. It is also possible to adopt. For example, although not shown in the figure, the illumination member 13 shown in FIG. 3 is rotated to form two linear boundaries 22 followed by two curved boundaries 23, that is, adjacent bright portions. The shape of the boundary of both sides differs between 19 and 19 (one bright part 19 forms the linear boundary 22 in the left side, and the other bright part 19 forms the linear boundary 22 in the right side) Alternatively, a stripe pattern image 21 may be formed. Alternatively, although not shown in the figure, the illumination member 13 provided with the light emitting surface 15a in which both the edge portions 17 and 18 are both linear and the light emitting surface 15a in which both the edge portions 17 and 18 are formed in a curved shape are provided. Illumination members 13 are prepared, and bright portions 19 that form linear boundaries 22 on both sides thereof and bright portions 19 that form curved boundaries 23 on both sides thereof are alternately arranged via dark portions 20. A stripe pattern image 19 may be formed.

また、以上の説明では、自動車用ボデー2の塗装面1におけるスジ3やブツ4等の塗装欠陥の有無を検出する場合を例示したが、本発明はこれに限らず、他の部品(製品)の塗装面1における塗装欠陥の有無を検出する場合はもちろん、光を反射するような面、すなわち光沢性を有する面を被検査面とする場合にも適用可能である。   Moreover, although the above description illustrated the case where the presence or absence of the coating defect, such as the stripe 3 and the bush 4, on the painted surface 1 of the body 2 for automobiles was illustrated, this invention is not limited to this, and other components (products) The present invention can be applied not only to detecting the presence or absence of a coating defect on the painted surface 1 but also to a surface that reflects light, i.e., a surface having glossiness, as the surface to be inspected.

1 塗装面(被検査面)
2 自動車用ボデー
3 スジ
4 ブツ
10 検査用照明装置
11 通路
12 カバー部材
13 照明部材
15 ケーシング
15a 発光面
16 発光源
17 直線状の縁部
18 曲線状の縁部
19 明部
20 暗部
21 ストライプパターン像
22 直線状の境界
23 曲線状の境界
119 明部
121 ストライプパターン像
1 Painted surface (surface to be inspected)
2 Automotive Body 3 Line 4 Buzz 10 Inspection Illumination Device 11 Passage 12 Cover Member 13 Illumination Member 15 Casing 15a Light Emitting Surface 16 Light Emitting Source 17 Linear Edge 18 Curved Edge 19 Bright Part 20 Dark Part 21 Stripe Pattern Image 22 linear boundary 23 curved boundary 119 bright part 121 stripe pattern image

Claims (4)

複数本の明部及び暗部を交互に配列してなるストライプパターン像を被検査面に投影するための検査用照明装置において、
前記ストライプパターン像は、前記複数本の明部の中から選択される一の明部とこれに隣接する一方の暗部との間に直線状の境界を形成し、前記一方の暗部とは反対側で隣接する他方の暗部との間に曲線状の境界を形成することを特徴とする検査用照明装置。
In an inspection illumination device for projecting a stripe pattern image formed by alternately arranging a plurality of bright portions and dark portions onto a surface to be inspected,
The stripe pattern image forms a linear boundary between one bright portion selected from the plurality of bright portions and one dark portion adjacent thereto, and is opposite to the one dark portion. An inspection illuminating device, wherein a curved boundary is formed between the other adjacent dark portion.
前記曲線状の境界は、波状に湾曲した形状をなす請求項1に記載の検査用照明装置。   The illumination device for inspection according to claim 1, wherein the curved boundary has a wave-like curved shape. 協働により前記ストライプパターン像を形成する複数の照明部材を備え、該各々の照明部材に設けられた発光面の幅方向一方側の縁部が直線状をなし、他方側の縁部が曲線状をなす請求項1又は2に記載の検査用照明装置。   A plurality of illumination members that form the stripe pattern image by cooperation are provided, and an edge on one side in the width direction of the light emitting surface provided on each of the illumination members is linear, and an edge on the other side is curved. The inspection illumination device according to claim 1 or 2, wherein: 複数本の明部及び暗部を交互に配列してなるストライプパターン像を被検査面に投影しながら前記ストライプパターン像と直交する向きに前記被検査面を移動させることで、前記被検査面上の欠陥を検出するための検査方法において、
前記ストライプパターン像として、前記複数本の明部の中から選択される一の明部とこれに隣接する一方の暗部との間に直線状の境界を形成し、前記一方の暗部とは反対側で隣接する他方の暗部との間に曲線状の境界を形成するものを用いることを特徴とする検査用照明装置を用いた検査方法。
By moving the surface to be inspected in a direction orthogonal to the stripe pattern image while projecting a stripe pattern image formed by alternately arranging a plurality of bright portions and dark portions onto the surface to be inspected, In the inspection method for detecting defects,
As the stripe pattern image, a linear boundary is formed between one bright portion selected from the plurality of bright portions and one dark portion adjacent thereto, and the opposite side to the one dark portion An inspection method using an inspection illuminating device, wherein a curved boundary is formed between the other adjacent dark portion.
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JP2000018932A (en) * 1998-04-27 2000-01-21 Asahi Glass Co Ltd Method and device for inspecting defects of specimen
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Publication number Priority date Publication date Assignee Title
JPH08145906A (en) * 1994-09-19 1996-06-07 Nissan Motor Co Ltd Method and equipment for inspection of defect of surface to be inspected
US5734742A (en) * 1994-09-19 1998-03-31 Nissan Motor Co., Ltd. Inspection system and process
JPH0961291A (en) * 1995-08-29 1997-03-07 Asahi Optical Co Ltd Apparatus for testing optical parts
JP2000018932A (en) * 1998-04-27 2000-01-21 Asahi Glass Co Ltd Method and device for inspecting defects of specimen
JP2012230005A (en) * 2011-04-26 2012-11-22 Fujitsu Ltd Defect inspection device and defect inspection method
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