JP3184287B2 - Light diffuser inspection equipment - Google Patents
Light diffuser inspection equipmentInfo
- Publication number
- JP3184287B2 JP3184287B2 JP05894992A JP5894992A JP3184287B2 JP 3184287 B2 JP3184287 B2 JP 3184287B2 JP 05894992 A JP05894992 A JP 05894992A JP 5894992 A JP5894992 A JP 5894992A JP 3184287 B2 JP3184287 B2 JP 3184287B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light diffuser
- diffuser
- length
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Length Measuring Devices By Optical Means (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光透過率が異なる複数
の材料で長手状に構成され、また、全体の光透過率が低
い光拡散体の長さや、光拡散体の内部変化、内部欠陥お
よび表面欠陥等を検査したり、光拡散体の特定位置を検
出する光拡散体の検査装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-diffusing body which is made of a plurality of materials having different light transmittances and has a long light-transmitting property, and which has a low light transmittance, an internal change of the light-diffusing material, The present invention relates to a light diffuser inspection device that inspects for defects and surface defects, and detects a specific position of a light diffuser.
【０００２】[0002]
【従来の技術】一般に、透明な被検査物を検査する場合
には、光源の光を被検査物を照射してその透過光をカメ
ラにより撮像してその変化を検出する透過方式が用いら
れ、また、遮光物体を検査する場合には、光源の光を被
検査物を照射してその反射光をカメラにより撮像する反
射方式が用いられる。したがって、被検査物が半透明な
樹脂板やタバコのフィルタのような光拡散体であり、ま
た、この光拡散体の内部を検査する場合には透過方式が
用いられる。2. Description of the Related Art In general, when inspecting a transparent object to be inspected, a transmission method is used in which light from a light source irradiates the object to be inspected, and the transmitted light is imaged by a camera to detect the change. When inspecting a light-shielding object, a reflection method is used in which light from a light source irradiates an object to be inspected and the reflected light is imaged by a camera. Therefore, the inspection object is a light diffuser such as a translucent resin plate or a cigarette filter, and a transmission system is used when inspecting the inside of the light diffuser.
【０００３】従来、光透過率が異なる複数の材料で長手
状に構成され、また、全体の光透過率が低い光拡散体を
検査する検査装置では、透過光のレベルが検出可能なよ
うな大きな光量の光源が用いられ、また、この光源は、
光拡散体が常に同一の位置にあることがないので、光拡
散体の長さや端部を検査する場合に光拡散体以上の長さ
および幅のものが用いられる。撮像素子としては一般
に、ポイントセンサをアレイ状に並べたものや、ライン
ＣＣＤイメージセンサが用いられ、また、透過光のレベ
ルが比較的低く、指向性を持たない光量変化を捕らえる
ために感度が高い受光素子を用いたり、撮像信号を２値
化する場合の閾値を比較的低レベルに設定する方法が採
られる。Conventionally, in an inspection apparatus for inspecting a light diffuser formed of a plurality of materials having different light transmittances and having a low overall light transmittance, the level of transmitted light is large enough to be detected. A light source of light quantity is used, and this light source
Since the light diffuser is not always located at the same position, when inspecting the length or the end of the light diffuser, a light diffuser having a length and width larger than that of the light diffuser is used. As an image sensor, generally, an array of point sensors arranged in an array or a line CCD image sensor is used. The level of transmitted light is relatively low, and the sensitivity is high to capture a change in the amount of light without directivity. A method of using a light receiving element or setting a threshold value for binarizing an imaging signal to a relatively low level is adopted.
【０００４】ここで、このような光拡散体として図３に
示すタバコのフィルタ１のように、活性炭入りの繊維束
１ａと、活性炭が入っていない繊維束１ｂの２つの成分
より成り、全体の光透過率が低い光拡散体を検査する場
合がある。このたばこに取り付けられる最終的な１つの
フィルタは、一例として図３（ｃ）に示すように長さが
１０ｍｍの活性炭入りの繊維束１ａと、長さが１５ｍｍ
の活性炭が入っていない繊維束１ｂの２つの成分より成
り、合計長が２５ｍｍであるが、製造工程では図３
（ａ）に示すように長さが２０ｍｍの活性炭入りの繊維
束１ａと、活性炭が入っていない長さが３０ｍｍの繊維
束１ｂが交互に配列されて製造される。Here, such a light diffuser is composed of two components, a fiber bundle 1a containing activated carbon and a fiber bundle 1b not containing activated carbon, as in a cigarette filter 1 shown in FIG. A light diffuser having a low light transmittance may be inspected. One final filter attached to this tobacco is, for example, a fiber bundle 1a containing activated carbon having a length of 10 mm and a length of 15 mm as shown in FIG.
Of the fiber bundle 1b which does not contain activated carbon, and has a total length of 25 mm.
As shown in (a), a fiber bundle 1a having a length of 20 mm and containing activated carbon and a fiber bundle 1b having a length of 30 mm and containing no activated carbon are arranged alternately.
【０００５】そして、この製造途中のフィルタは、図３
（ｂ）に示すように４個分（１００ｍｍ）毎に切断さ
れ、図３（ｅ）に示すように閾値ＴＨによりフィルタ１
の全長が検出されるとともに、この２つの繊維束１ａ、
１ｂが長さ方向に交互に正常状態で配列されているか等
が検出される。ここで、図３（ｄ）に示すようにフィル
タ４個分の長さが正しくても、左端と右端の活性炭入り
の繊維束１ａの長さが異なる場合、４等分すると最終的
なフィルタの繊維束１ａ、１ｂの各長さが不良となる。[0005] The filter being manufactured is shown in FIG.
As shown in FIG. 3B, the filter 1 is cut at intervals of four pieces (100 mm), and as shown in FIG.
Of the two fiber bundles 1a,
It is detected whether 1b are alternately arranged in a normal state in the length direction. Here, as shown in FIG. 3 (d), even if the length of four filters is correct, if the length of the activated carbon-containing fiber bundle 1a at the left end is different from that of the right end, then dividing the filter into four equal parts will result in a final filter. Each length of the fiber bundles 1a and 1b becomes defective.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記従
来の光拡散体の検査装置では、図３（ｅ）に示すように
検出波形のレベルが隣接する繊維束１ａ、１ｂにより影
響を受けて、繊維束１ａ、１ｂの境界のレベル変化が緩
やかになる。したがって、このレベルを閾値ＴＨにより
２値化して境界を検出した場合、照明や繊維束１ａ、１
ｂの透過率の変動により検出レベルが変動するので、境
界を正確に検出することができないという問題点があ
る。However, in the conventional light diffuser inspection apparatus, the level of the detected waveform is affected by the adjacent fiber bundles 1a and 1b, as shown in FIG. The level change at the boundary between the bundles 1a and 1b becomes gentle. Therefore, when the level is binarized by the threshold value TH to detect the boundary, the illumination and the fiber bundles 1a, 1a
Since the detection level fluctuates due to the fluctuation of the transmittance b, there is a problem that the boundary cannot be detected accurately.
【０００７】また、上記検査装置を用いて撮像信号を１
つの閾値ＴＨにより２値化する場合、この閾値ＴＨを高
く設定するとフィルタ１の両端のピーク値により全長を
検出することができるが、２つの繊維束１ａ、１ｂの境
界を識別することができず、他方、この閾値ＴＨを低く
設定すると２つの繊維束１ａ、１ｂの境界を識別するこ
とができるが、フィルタ１の全長を検出することができ
ない。[0007] Further, using the above-described inspection apparatus, the imaging signal is set to 1
In the case of binarization using two thresholds TH, if this threshold TH is set high, the entire length can be detected by the peak values at both ends of the filter 1, but the boundary between the two fiber bundles 1a and 1b cannot be identified. On the other hand, if the threshold value TH is set low, the boundary between the two fiber bundles 1a and 1b can be identified, but the entire length of the filter 1 cannot be detected.
【０００８】したがって本発明は、光透過率が異なる複
数の材料で構成されて全体の光透過率が低い光拡散体の
各材料の境界位置を正確に検出することができる光拡散
体の検査装置を提供することを目的とする。Accordingly, the present invention provides a light diffuser inspection apparatus which can accurately detect a boundary position between materials of a light diffuser which is composed of a plurality of materials having different light transmittances and has a low overall light transmittance. The purpose is to provide.
【０００９】[0009]
【課題を解決するための手段】本発明では上記目的を達
成するために、光源により光拡散体を、その長さ方向に
一様に照明し、前記光源からの光が直接入射しないよう
配置された撮像手段により撮像された画像から得られた
信号を、前記光拡散体の最も高光透過率の材料を識別す
るための第１の閾値により２値化して前記光拡散体の両
端の位置及び全長を検出し、前記光拡散体の各材料部分
を識別するための第２の閾値により２値化し、この２値
化データにより少なくとも１種類の材料からなる部分の
両端の位置を求めてその中心位置を算出し、この部分の
中心位置および既知の長さ並びに前記光拡散体の両端の
位置を用いて他の材料からなる部分であって、前記光拡
散体の両端に位置するそれぞれの部分との境界を検出す
るようにしている。According to the present invention, in order to achieve the above object, a light diffuser is provided by a light source in a longitudinal direction thereof.
Illuminate uniformly, so that light from the light source does not enter directly
A signal obtained from an image picked up by the arranged image pickup means is binarized by a first threshold for identifying a material having the highest light transmittance of the light diffuser, and is binarized. The positions and the total lengths of both ends of the light diffuser are detected, and are binarized by a second threshold value for identifying each material portion of the light diffuser, and a portion made of at least one kind of material is obtained from the binarized data. a seeking positions of both ends thereof is calculated center position, made of another material with a central position and the position of the ends of known length and said light diffuser of this part section of the light expansion
The boundary between each part located at both ends of the scatterer is detected.
【００１０】すなわち本発明によれば、光透過率が異な
る複数の材料部分で長手状に構成され、また、全体の光
透過率が低い光拡散体を検査する光拡散体の検査装置に
おいて、前記光拡散体を、その長さ方向に一様に照明す
る光源と、前記光源からの光が直接入射しないよう配置
され、前記光拡散体の透過光を撮像する撮像手段と、前
記撮像手段により撮像された画像から得られる信号を、
前記光拡散体の最も高光透過率の材料を識別するための
第１の閾値により２値化して前記光拡散体の両端の位置
と全長を検出し、前記光拡散体の各材料部分を識別する
ための第２の閾値により２値化し、この２値化データに
より少なくとも１種類の材料からなる部分の両端の位置
を求めてその中心位置を算出し、この部分の中心位置お
よび既知の長さ並びに前記光拡散体の両端の位置を用い
て他の材料からなる部分であって、前記光拡散体の両端
に位置するそれぞれの部分との境界を検出する画像処理
手段とを有することを特徴とする光拡散体の検査装置が
提供される。好ましくは、前記光拡散体を支持するため
に、幅が前記光拡散体の幅より短く、長さが前記光拡散
体の長さより長いスリットを更に有し、前記光源は、前
記スリットを介して前記光拡散体を照明する前記検査装
置が提供される。That is, according to the present invention, in the light diffuser inspection apparatus for inspecting a light diffuser formed of a plurality of material portions having different light transmittances and having a low overall light transmittance. A light source for uniformly illuminating the light diffuser in its length direction, and a light source is arranged so that light from the light source does not directly enter.
And imaging means for imaging transmitted light of the light diffuser, and a signal obtained from an image captured by the imaging means,
Binarization by a first threshold value for identifying a material having the highest light transmittance of the light diffuser and positions at both ends of the light diffuser
And the total length are detected, and are binarized by a second threshold for identifying each material portion of the light diffuser, and the positions of both ends of the portion made of at least one type of material are obtained by using the binarized data. Calculate the center position and use the center position and known length of this part and the positions at both ends of the light diffuser.
The other end of the light diffuser.
And an image processing means for detecting a boundary with each of the portions located in the light diffuser. Preferably, in order to support the light diffuser, the light diffuser further includes a slit having a width shorter than the width of the light diffuser and a length longer than the length of the light diffuser, wherein the light source is provided through the slit. The inspection device for illuminating the light diffuser is provided.
【００１１】[0011]
【作用】本発明は上記構成を有するので、幅が光拡散体
の幅より短いスリットにより光拡散体の幅方向とスリッ
トの間を通過する光源の光が遮断され、光拡散体の両端
とスリットの間を通過した光源の光のレベルが第１の閾
値により２値化され、光拡散体の両端の位置が検出され
る。また、第２の閾値により２値化されて少なくとも１
種類の材料の両端の位置が求められてその中心位置が算
出され、この材料の中心位置および既知の長さと前記光
拡散体の両端の位置により他の材料との境界が検出され
る。したがって、光透過率が異なる複数の材料で構成さ
れて全体の光透過率が低い光拡散体の各材料の境界位置
を正確に検出することができる。Since the present invention has the above construction, the light of the light source passing between the width direction of the light diffuser and the slit is blocked by the slit having a width smaller than the width of the light diffuser, and both ends of the light diffuser are connected to the slit. The level of the light of the light source that has passed through the gap is binarized by the first threshold, and the positions of both ends of the light diffuser are detected. Also, at least 1
The positions of both ends of the type of material are obtained and the center position thereof is calculated, and a boundary with another material is detected based on the center position and known length of the material and the positions of both ends of the light diffuser. Therefore, it is possible to accurately detect the boundary position of each material of the light diffuser made of a plurality of materials having different light transmittances and having a low overall light transmittance.
【００１２】[0012]
【実施例】以下、図面を参照して本発明の実施例を説明
する。図１は、本発明に係る光拡散体の検査装置の一実
施例を示す構成図、図２は、図１の検査装置により検出
された正常なフィルタの撮像信号を示す波形図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of a light diffuser inspection apparatus according to the present invention, and FIG. 2 is a waveform diagram showing a normal filter image signal detected by the inspection apparatus of FIG.
【００１３】図１において、この検査装置では、光拡散
体としてタバコのフィルタ１が検査され、このフィルタ
１は長さが１０ｍｍの活性炭入りの繊維束１ａと、長さ
が１５ｍｍの活性炭が入っていない繊維束１ｂの２つの
成分より成り、合計長が２５ｍｍであるが、図３（ｂ）
に示すように４個分（１００ｍｍ）毎に切断されて検査
される。このようなフィルタ１は、ドラム２により幅方
向に１本毎に搬送され、この搬送中に上記２つの繊維束
１ａ、１ｂの長さが正しいか、全長が正しいか、２つの
繊維束１ａ、１ｂが交互に配列されているか等が検査さ
れ、また、これらの不良を除去するために検査結果が生
産装置にフィードバックされる。In FIG. 1, in this inspection apparatus, a filter 1 of cigarette is inspected as a light diffuser. This filter 1 contains a fiber bundle 1a containing activated carbon having a length of 10 mm and activated carbon having a length of 15 mm. FIG. 3 (b), which consists of two components of a non-fibrous bundle 1 b and has a total length of 25 mm.
As shown in (1), it is cut every four pieces (100 mm) and inspected. Such a filter 1 is conveyed one by one in the width direction by a drum 2, and during this conveyance, the length of the two fiber bundles 1a and 1b is correct, the total length is correct, and the two fiber bundles 1a, It is inspected whether or not 1b are alternately arranged, and the inspection result is fed back to the production apparatus in order to remove these defects.
【００１４】図１において、ドラム２には、フィルタ１
の幅より小さく、フィルタ１より長いスリット２ａが軸
方向に形成され、フィルタ１の検査位置には、スリット
２ａを介してフィルタ１を照明するために、ライトガイ
ド３の端面３ａがライン状に配列されている。ライトガ
イド３はプラスチックファイバで構成され、したがっ
て、端面３ａではフィルタ１の長さ方向に一様に照明す
るようにライン状に配列することができる。また、ライ
トガイド３の他方の端面３ｂは集束されて光源４に対向
し、また、光源４としては例えばハロゲンランプが用い
られる。したがって、光源４からの光がライトガイド３
を介して検査位置まで導かれ、その端面３ａにおいてフ
ィルタ１の長さ方向に広げられ、スリット２ａを介して
フィルタ１に入射する。In FIG. 1, a drum 2 has a filter 1
A slit 2a smaller than the width of the filter 1 and longer than the filter 1 is formed in the axial direction. At the inspection position of the filter 1, the end faces 3a of the light guide 3 are arranged in a line in order to illuminate the filter 1 through the slit 2a. Have been. The light guide 3 is made of a plastic fiber. Therefore, the light guide 3 can be linearly arranged on the end face 3a so as to uniformly illuminate the filter 1 in the longitudinal direction. The other end face 3b of the light guide 3 is converged and faces the light source 4, and the light source 4 is, for example, a halogen lamp. Therefore, the light from the light source 4 is
To the inspection position, is spread in the longitudinal direction of the filter 1 at the end face 3a, and enters the filter 1 through the slit 2a.
【００１５】そして、フィルタ１の透過光の光路に対し
て、フィルタ１の両端とスリット２ａの間を通過する光
が入射しないように、ラインＣＣＤカメラ５がフィルタ
１の搬送方向に傾斜して配置され、したがって、上記２
つの繊維束の長さが正しいか、全長が正しいか、２つの
繊維束の間に何も充填されていなか等を検査するための
映像が撮像され、画像処理装置７に入力する。なお、こ
の実施例では、ラインＣＣＤカメラ５は、１画素の解像
度が０．１ｍｍであって視野領域が２００ｍｍのものが
用いられている。The line CCD camera 5 is arranged obliquely in the conveying direction of the filter 1 so that light passing between both ends of the filter 1 and the slit 2a does not enter the optical path of the transmitted light of the filter 1. And therefore 2
An image for inspecting whether the length of one fiber bundle is correct, the total length is correct, whether there is nothing between the two fiber bundles, and the like are captured and input to the image processing device 7. In this embodiment, the line CCD camera 5 has a resolution of one pixel of 0.1 mm and a visual field of 200 mm.
【００１６】なお、ＣＣＤカメラ５の最適角度と撮像位
置について説明すると、満足しなければならない条件と
しては、（１）フィルタ１の搬送方向における検査期間
において、安定した出力波形が得られること、（２）ラ
イン状の光源（すなわち端面３ａ）からスリット２ａを
通過した光がカメラ５に入射しないこと、（３）上記搬
送方向の検査期間において、スリット２ａの壁面がカメ
ラ５の視野内に入らないこと、の３点である。The optimum angle and the imaging position of the CCD camera 5 will be described. The conditions that must be satisfied are (1) that a stable output waveform can be obtained during the inspection period in the transport direction of the filter 1; 2) Light that has passed through the slit 2a from the linear light source (that is, the end face 3a) does not enter the camera 5; That is three points.
【００１７】このような構成において、正常なフィルタ
１の透過光を撮像した場合、図２に示すようにその撮像
信号のレベルは、フィルタ１の両端外側を回り込んだ光
によりフィルタ１の両端外側において最も高く、活性炭
が入っていない繊維束１ｂの領域で中間程度であり、活
性炭入りの繊維束１ａの領域で最も低い。したがって、
フィルタ１の両端外側と活性炭が入っていない繊維束１
ｂの間の閾値２１により例えば２回２値化して平均化す
ることにより、フィルタ１の両端の位置を検出すること
ができる。In such a configuration, when the light transmitted through the normal filter 1 is imaged, the level of the imaged signal is changed by the light circling around both ends of the filter 1 as shown in FIG. Is highest in the region of the fiber bundle 1b containing no activated carbon, and the lowest in the region of the fiber bundle 1a containing activated carbon. Therefore,
Fiber bundle 1 without activated carbon and both ends outside of filter 1
By binarizing and averaging twice, for example, twice with the threshold 21 between b, the positions at both ends of the filter 1 can be detected.
【００１８】つぎに、図３（ｂ）（ｄ）に示すような状
態のフィルタにおいて、繊維束１ａ、１ｂの各長さが正
しいか否かを検出する場合について説明する。この最終
的なフィルタが４本分連結した状態では、活性炭が入っ
ていない繊維束１ｂと中央の繊維束１ａが切断されず、
両端の繊維束１ａが切断されている。また、繊維束１
ａ、１ｂの正常な各長さは既知であり、切断されていな
い繊維束１ａ、１ｂの実際の長さは正しい。Next, a description will be given of a case where it is detected whether or not the lengths of the fiber bundles 1a and 1b are correct in the filter in the state shown in FIGS. 3 (b) and 3 (d). In a state where the final filter is connected for four fibers, the fiber bundle 1b containing no activated carbon and the central fiber bundle 1a are not cut,
Fiber bundles 1a at both ends are cut. Fiber bundle 1
The normal lengths of a and 1b are known, and the actual lengths of the uncut fiber bundles 1a and 1b are correct.
【００１９】そこで、繊維束１ａ、１ｂのレベルの間の
閾値２２により例えば２回２値化して平均化することに
より、繊維束１ｂの両端を求めてその中心位置Ｏ１、Ｏ
２を求め、この繊維束１ｂの中心位置Ｏ１、Ｏ２と繊維
束１ｂの既知の長さと、中央の繊維束１ａの既知の長さ
と、フィルタ１の両端の位置により、両端において切断
された繊維束１ａとの境界を求める。したがって、図３
（ｄ）に示すようにフィルタ４個分の長さが正しくて
も、左端と右端の活性炭入りの繊維束１ａの長さが異な
る場合の不良を検出することができる。Therefore, the two ends of the fiber bundle 1b are binarized and averaged, for example, by the threshold value 22 between the levels of the fiber bundles 1a and 1b, thereby obtaining both ends of the fiber bundle 1b and their center positions O1 and O2.
2 are obtained, and the fiber bundles cut at both ends are obtained based on the center positions O1 and O2 of the fiber bundle 1b, the known length of the fiber bundle 1b, the known length of the central fiber bundle 1a, and the positions of both ends of the filter 1. 1a is determined. Therefore, FIG.
As shown in (d), even if the lengths of the four filters are correct, it is possible to detect a defect when the lengths of the activated carbon-containing fiber bundles 1a at the left end and the right end are different.
【００２０】また、この実施例によれば、画像信号から
フィルタ１がカメラ５の視野を通過するタイミングを検
出する場合には、適当な閾値で２値化することにより検
査開始のタイミングに用いることができる。但し、この
閾値を低く設定すると、外乱光やドラム２の形状等によ
る反射光の影響を受ける可能性があるが、フィルタ１の
両端で反射する光が繊維束１ａ、１ｂの透過光量より大
きいので、フィルタ１の両端を確実に検出することがで
きる。Further, according to this embodiment, when detecting the timing at which the filter 1 passes through the field of view of the camera 5 from the image signal, the filter 1 may be binarized with an appropriate threshold value to be used as the timing for starting the inspection. Can be. However, if this threshold value is set low, it may be affected by disturbance light or reflected light due to the shape of the drum 2 or the like. However, since light reflected at both ends of the filter 1 is larger than the amount of light transmitted through the fiber bundles 1a and 1b. , The both ends of the filter 1 can be reliably detected.
【００２１】なお、上記実施例では、フィルタ１に対し
てスリット２ａを介して光を入射する場合について説明
したが、実際には不透明なアクリル板等によりドラム２
を構成してフィルタ１を支持するための凹部を形成し、
この凹部を透明に形成してもよい。また、カメラ５をフ
ィルタ１の搬送方向に対して斜めに傾斜して配置した
が、代わりに光源であるライトガイド３の端面３ａを斜
めに傾斜して配置してもよい。さらに、スリット２ａの
壁面を無反射塗料等を塗布したり、形状を変更すること
により、スリット２ａの壁面の反射光がカメラ５に入射
する光量を減少することができる。また、撮像信号を２
値化する場合、複数回走査する代わりに１回の走査信号
を２系統の２値化回路で処理するように構成してもよ
い。In the above embodiment, the case where light enters the filter 1 through the slit 2a has been described. However, in practice, the drum 2 is made of an opaque acrylic plate or the like.
To form a recess for supporting the filter 1,
This recess may be formed transparent. Further, although the camera 5 is disposed obliquely with respect to the transport direction of the filter 1, the end face 3a of the light guide 3 as a light source may be disposed obliquely instead. Further, the amount of light reflected by the wall surface of the slit 2a and incident on the camera 5 can be reduced by applying a non-reflective paint or the like to the wall surface of the slit 2a or changing the shape. Also, if the imaging signal is 2
In the case of binarization, a configuration may be adopted in which one scan signal is processed by two-system binarization circuits instead of scanning a plurality of times.
【００２２】[0022]
【発明の効果】以上説明したように、本発明によれば、
幅が光拡散体の幅より短いスリットにより光拡散体の幅
方向とスリットの間を通過する光源の光が遮断され、光
拡散体の両端とスリットの間を通過した光源の光のレベ
ルが第１の閾値により２値化され、光拡散体の両端の位
置が検出される。また、第２の閾値により２値化されて
光拡散体の各材料の境界が検査される。したがって、光
透過率が異なる複数の材料で構成されて全体の光透過率
が低い光拡散体を最適に検査することができる。As described above, according to the present invention,
The light of the light source passing between the width direction of the light diffuser and the slit is blocked by the slit whose width is shorter than the width of the light diffuser, and the light level of the light source passing between both ends of the light diffuser and the slit is changed to the second level. Binarization is performed using the threshold value of 1, and the positions of both ends of the light diffuser are detected. The boundary of each material of the light diffuser is binarized by the second threshold value and inspected. Therefore, it is possible to optimally inspect a light diffuser made of a plurality of materials having different light transmittances and having a low overall light transmittance.
【図１】本発明に係る光拡散体の検査装置の一実施例を
示す構成図である。FIG. 1 is a configuration diagram showing one embodiment of a light diffuser inspection apparatus according to the present invention.
【図２】図１の検査装置により検出された正常なフィル
タの撮像信号を示す波形図である。FIG. 2 is a waveform diagram showing an image signal of a normal filter detected by the inspection device of FIG. 1;
【図３】たばこのフィルタの検査工程を示す説明図であ
る。FIG. 3 is an explanatory view showing an inspection process of the filter of the tobacco.
１ タバコのフィルタ（光拡散体） ２ａ スリット ３ ライトガイド ３ａ ライトガイド端面（ライン状光源） ４ 光源 ５ ＣＣＤカメラ ７ 画像処理装置 Reference Signs List 1 cigarette filter (light diffuser) 2a slit 3 light guide 3a light guide end face (linear light source) 4 light source 5 CCD camera 7 image processing device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 池田 徳之 神奈川県川崎市多摩区登戸3816番地 三 菱レイヨン株式会社内 (72)発明者 澁谷 幸生 東京都中央区京橋２丁目３番19号 三菱 レイヨン株式会社内 (56)参考文献 特開 平２−128112（ＪＰ，Ａ) 特開 昭58−210554（ＪＰ，Ａ) 特開 昭55−99184（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01N 21/84 - 21/958 G01B 11/00 - 11/30 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tokuyuki Ikeda 3816 Noto, Noto, Tama-ku, Kawasaki-shi, Kanagawa Prefecture (72) Inventor Yukio Shibuya 2-39-1 Kyobashi, Chuo-ku, Tokyo Mitsubishi Rayon Co., Ltd. In-company (56) References JP-A-2-128112 (JP, A) JP-A-58-210554 (JP, A) JP-A-55-99184 (JP, A) (58) Fields investigated (Int. . 7, DB name) G01N 21/84 - 21/958 G01B 11/00 - 11/30
Claims (2)
状に構成され、また、全体の光透過率が低い光拡散体を
検査する光拡散体の検査装置において、 前記光拡散体を、その長さ方向に一様に照明する光源
と、前記光源からの光が直接入射しないよう配置され、 前記
光拡散体の透過光を撮像する撮像手段と、 前記撮像手段により撮像された画像から得られる信号
を、前記光拡散体の最も高光透過率の材料を識別するた
めの第１の閾値により２値化して前記光拡散体の両端の
位置と全長を検出し、前記光拡散体の各材料部分を識別
するための第２の閾値により２値化し、この２値化デー
タにより少なくとも１種類の材料からなる部分の両端の
位置を求めてその中心位置を算出し、この部分の中心位
置および既知の長さ並びに前記光拡散体の両端の位置を
用いて他の材料からなる部分であって、前記光拡散体の
両端に位置するそれぞれの部分との境界を検出する画像
処理手段とを有することを特徴とする光拡散体の検査装
置。1. A light diffuser inspection apparatus configured to inspect a light diffuser formed of a plurality of material portions having different light transmittances and having a low light transmittance as a whole, wherein : A light source that illuminates the light uniformly in the length direction, an imaging unit that is arranged so that light from the light source does not directly enter , captures transmitted light of the light diffuser, and an image captured by the imaging unit. The signal to be obtained is binarized by a first threshold value for identifying the material having the highest light transmittance of the light diffuser, and is binarized at both ends of the light diffuser .
The position and the total length are detected, binarized by a second threshold value for identifying each material portion of the light diffuser, and the positions of both ends of the portion made of at least one type of material are obtained from the binarized data. The center position is calculated, and the center position and the known length of this part and the positions of both ends of the light diffuser are calculated.
A portion made of another material using the light diffuser.
An image processing means for detecting boundaries between respective portions located at both ends, and a light diffuser inspection device.
記光拡散体の幅より短く、長さが前記光拡散体の長さよ
り長いスリットを更に有し、前記光源は前記スリットを
介して前記光拡散体を照明する請求項１に記載の検査装
置。2. In order to support the light diffuser, the light diffuser further includes a slit having a width shorter than a width of the light diffuser and a length longer than a length of the light diffuser, wherein the light source passes through the slit. The inspection device according to claim 1, wherein the light diffuser is illuminated with the light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05894992A JP3184287B2 (en) | 1992-02-12 | 1992-02-12 | Light diffuser inspection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05894992A JP3184287B2 (en) | 1992-02-12 | 1992-02-12 | Light diffuser inspection equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05223753A JPH05223753A (en) | 1993-08-31 |
| JP3184287B2 true JP3184287B2 (en) | 2001-07-09 |
Family
ID=13099084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05894992A Expired - Lifetime JP3184287B2 (en) | 1992-02-12 | 1992-02-12 | Light diffuser inspection equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3184287B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220139224A (en) | 2021-04-07 | 2022-10-14 | 야스카 메이 | Traveling apparatus for advertisement and promotion |
| KR102491016B1 (en) * | 2022-07-13 | 2023-01-20 | 이승재 | Composite Filter Segment Length Measuring Device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3377753B2 (en) * | 1998-08-28 | 2003-02-17 | 吉野石膏株式会社 | Edge angle detection device and edge angle detection method |
| JP4917364B2 (en) * | 2006-07-05 | 2012-04-18 | 株式会社メック | Inspection apparatus and inspection method |
-
1992
- 1992-02-12 JP JP05894992A patent/JP3184287B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220139224A (en) | 2021-04-07 | 2022-10-14 | 야스카 메이 | Traveling apparatus for advertisement and promotion |
| KR102491016B1 (en) * | 2022-07-13 | 2023-01-20 | 이승재 | Composite Filter Segment Length Measuring Device |
| WO2024014757A1 (en) * | 2022-07-13 | 2024-01-18 | 이승재 | Composite filter segment length measurement device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05223753A (en) | 1993-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4132046B2 (en) | Device for inspecting defects of sheet-like transparent body | |
| US7551274B1 (en) | Defect detection lighting system and methods for large glass sheets | |
| JPH0515426B2 (en) | ||
| KR960014919A (en) | Optical inspection method and optical inspection device | |
| US20070229827A1 (en) | Optical monitoring of products of the tobacco-processing industry | |
| JP2011053173A (en) | Defect detection method and defect detection device of thread | |
| JPH11311510A (en) | Method and apparatus for inspection of very small uneven part | |
| JP5393973B2 (en) | Rod lens array inspection apparatus and method | |
| JP3184287B2 (en) | Light diffuser inspection equipment | |
| JP2015068670A (en) | Device and method for inspecting defect of sheet-like matter | |
| JPH04122839A (en) | Inspecting method of surface | |
| JP7151469B2 (en) | Sheet defect inspection device | |
| JP3241785B2 (en) | Light diffuser inspection equipment | |
| JPH11248643A (en) | Detection device for foreign matter in transparent film | |
| JP6679942B2 (en) | Sheet defect inspection device | |
| CN112703393B (en) | Illumination for defect inspection of sheet, defect inspection device for sheet, and defect inspection method for sheet | |
| JPH10185830A (en) | Transparent sheet inspection device | |
| JP2895773B2 (en) | Inspection equipment for transparent articles | |
| JPH0227242A (en) | Surface defect detector for cable | |
| JPH0236339A (en) | Defect inspecting device by light beam | |
| US5995216A (en) | Pattern inspection apparatus | |
| JPS5834348A (en) | Inspecting device for defect of bottle opening | |
| JP2004132801A (en) | Surface defect inspection device for band like body | |
| JP2002014058A (en) | Method and apparatus for checking | |
| JP3984367B2 (en) | Surface defect inspection method and inspection apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20010403 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313113 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080427 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090427 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100427 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110427 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120427 Year of fee payment: 11 |
|
| EXPY | Cancellation because of completion of term |