JP4177204B2 - Container foreign matter inspection system - Google Patents

Container foreign matter inspection system Download PDF

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JP4177204B2
JP4177204B2 JP2003304061A JP2003304061A JP4177204B2 JP 4177204 B2 JP4177204 B2 JP 4177204B2 JP 2003304061 A JP2003304061 A JP 2003304061A JP 2003304061 A JP2003304061 A JP 2003304061A JP 4177204 B2 JP4177204 B2 JP 4177204B2
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忠弘 片根
浩美 山崎
裕久 福田
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Hitachi Information and Control Solutions Ltd
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本発明は、容器に液体を充填した製品について充填液体中に混入の異物を検出する異物検査方法とその装置、特に光透過性の容器に光透過性の液体を充填した製品の異物検査に適した装置に関する。   INDUSTRIAL APPLICABILITY The present invention is suitable for a foreign matter inspection method and apparatus for detecting foreign matter mixed in a filling liquid of a product in which a container is filled with a liquid, particularly for a foreign matter inspection of a product filled with a light transmissive liquid in a light transmissive container. Related to the device.

光透過性の容器に光透過性の液体を充填した製品について充填液体への異物の混入の有無を検査するには、検査対象の製品を撮影して検査画像を取得し、その検査画像を処理して異物の検出をなすという検査画像による手法が広く用いられている。ただ、この検査画像手法では容器面の傷や容器面に付着の汚れと異物とを判別できるようにする必要がある。例えば特許文献1や特許文献2には、容器中の充填液体に回転を与え、それにより充填液体中の異物を動かすことで容器の傷や汚れと異物との判別をなせるようにしている。   To inspect the presence of foreign matter in the filling liquid of a product filled with a light-transmitting liquid in a light-transmitting container, capture the inspection product, obtain the inspection image, and process the inspection image Thus, a technique based on an inspection image for detecting foreign matters is widely used. However, in this inspection image method, it is necessary to be able to discriminate between scratches on the container surface, dirt adhered to the container surface, and foreign matter. For example, in Patent Document 1 and Patent Document 2, rotation is given to the filling liquid in the container, and thereby the foreign matter in the filling liquid is moved so that the container can be distinguished from scratches and dirt.

具体的には、容器に回転(自転)を与えることで容器内の充填液体を回転させ、それから容器の回転を急激に停止させる。そうすると、容器が停止しても充填液体は慣性により回転した状態が得られるので、この状態で容器の外部から充填液体を複数回撮影して複数枚の検査画像を得る。そしてこれら複数の検査画像から画像処理などにより、容器の傷や汚れと区別して異物の有無を判定する。すなわち複数枚の検査画像は容器が停止し充填液体だけが動いている状態での画像である。したがって、充填液体中に混入している異物は、充填液体の回転で回転し、複数枚の検査画像において移動物として異なる位置に現れ、一方、容器の傷や汚れは、容器が停止しているため、複数枚の検査画像において同じ位置に現れる。そこで複数枚の画像に移動物の像があるか否かを判定することにより、異物の有無を判断する。その異物には、容器の製造工程で容器に入り込む例えばガラス片やプラスチック片あるいは金属片などがあり、また液体の製造工程で液体に混入する例えばフィルタ片や不純物などがある。   Specifically, the filling liquid in the container is rotated by applying rotation (autorotation) to the container, and then the rotation of the container is rapidly stopped. Then, even if the container is stopped, the filling liquid can be rotated by inertia. In this state, the filling liquid is photographed a plurality of times from the outside of the container to obtain a plurality of inspection images. Then, the presence or absence of foreign matter is determined from the plurality of inspection images by image processing or the like in distinction from the scratches and dirt on the container. That is, the plurality of inspection images are images in a state where the container is stopped and only the filling liquid is moving. Accordingly, the foreign matters mixed in the filling liquid rotate by the rotation of the filling liquid and appear at different positions as moving objects in a plurality of inspection images, while the scratches and dirt on the container are stopped by the container. Therefore, they appear at the same position in a plurality of inspection images. Therefore, the presence / absence of a foreign object is determined by determining whether or not there is an image of a moving object in a plurality of images. The foreign matter includes, for example, a glass piece, a plastic piece, a metal piece, or the like that enters the container in the container manufacturing process, and a filter piece or an impurity mixed in the liquid in the liquid manufacturing process.

特開2002−267613号公報JP 2002-267613 A 特開2003−107011号公報JP 2003-107011 A

検査画像を用いて異物の検出を行う検査手法では、充填液体中の異物が検査画像に写ることが必要である。しかし異物のなかには例えばガラス片やプラスチック片などのように光透過性で、その光透過率が充填液体のそれにきわめて近く、単に照明光を当てただけではその異物の像を検査画像中に捉え難いものがあり、従来の検査技術ではこのような異物の検出が困難であった。   In the inspection method for detecting foreign matter using an inspection image, it is necessary that the foreign matter in the filling liquid appears in the inspection image. However, some foreign materials are light transmissive, such as glass and plastic pieces, and the light transmittance is very close to that of the filling liquid, and it is difficult to capture the image of the foreign material in the inspection image by simply illuminating it with illumination light. However, it has been difficult to detect such foreign matter with conventional inspection techniques.

したがって本発明の目的は、光透過率が充填液体のそれにきわめて近い光透過性の異物でも確実に検出することを可能とする異物検査装置を提供することにある。   Accordingly, an object of the present invention is to provide a foreign matter inspection apparatus that can reliably detect even a light transmissive foreign matter whose light transmittance is very close to that of a filling liquid.

本発明は、光透過率が容器内の充填液体に近く且つ屈折率が充填液体とは異なる充填液体中の異物を検出する容器充填液体の異物検査装置であって、
照明光源と検出対象容器との間に設けた、上記異物よりもパターン間隔が小さく且つ規則的なパターンが形成された異物像形成板と、
容器を異物検査のために回転パターンを与えて回転させその後で停止させる制御手段と、
回転の停止後の、容器内充填液体の回転中の少なくとも異なる2つのタイミングで、上記異物像形成板を透過して容器を介して得られる第1、第2の透過光を撮像するカメラと、
上記カメラでの第1、第2の撮影画像の差分をとり異物像形成板対応のパターン映像に歪みがあるか否かを検査し、歪みがあるときに異物があるものと判定する処理手段と、
を備える容器充填液体の異物検査装置を開示する。
The present invention is a container filling liquid foreign matter inspection apparatus for detecting foreign matter in a filling liquid whose light transmittance is close to that of the filling liquid in the container and whose refractive index is different from that of the filling liquid,
A foreign object image forming plate provided between the illumination light source and the detection target container, in which a pattern interval is smaller than the foreign substance and a regular pattern is formed,
A control means for rotating the container by giving a rotation pattern for foreign object inspection, and then stopping the container;
A camera for imaging the first and second transmitted light obtained through the container through the foreign substance image forming plate at at least two different timings during rotation of the filling liquid in the container after the rotation is stopped;
Processing means for taking a difference between the first and second captured images of the camera and inspecting whether or not the pattern image corresponding to the foreign object image forming plate is distorted and determining that there is a foreign object when there is distortion; ,
A foreign matter inspection apparatus for a container-filled liquid comprising:

上記のような異物検査方法ないし検査装置によれば、光透過率が充填液体のそれにきわめて近い異物でもその屈折率が充填液体と相違することを利用することで、異物像形成手段の規則的パターンが検査画像中に与える規則的パターン像の歪みとして異物の像を検査画像中に形成させることができる。そしてこのことにより、従来の検査画像手法ではその検出が困難であった異物でも容易に検出することができるようになり、異物検査の精度をより一層高めることが可能となる。   According to the foreign matter inspection method or inspection apparatus as described above, the regular pattern of the foreign matter image forming means is utilized by utilizing the fact that the refractive index of a foreign matter whose light transmittance is very close to that of the filling liquid is different from that of the filling liquid. As a distortion of the regular pattern image given to the inspection image, a foreign object image can be formed in the inspection image. As a result, it is possible to easily detect even a foreign object that has been difficult to detect with the conventional inspection image technique, and it is possible to further increase the accuracy of the foreign object inspection.

以下、本発明の実施の形態について説明する。図1に一実施形態による検査装置の構成を模式化して示す。本実施形態における検査装置は、例えばプラスチック容器やアンプルあるいはバイアル瓶などの光透過性の容器に例えば注射液や栄養剤あるいは清涼飲料などの光透過性の液体を充填した製品の製造ラインに組み込まれることを前提にした構成となっている。具体的には、検査のための搬送系として、製造ラインの上流側からの搬送コンベアCに接続して検査対象の製品Mを受け入れる搬入ロータ1、搬入ロータ1で受け入れた製品Mを検査のために搬送する搬送ロータ2、検査を終えた製品Mを搬送ロータ2から良品・不良品に選別して送り出す選別部を兼ねた搬出ロータ3、搬出ロータ3に接続して良品を搬出する良品コンベア4、および同じく搬出ロータ3に接続して不良品を搬出する不良品コンベア5を備えている。   Embodiments of the present invention will be described below. FIG. 1 schematically shows the configuration of an inspection apparatus according to an embodiment. The inspection apparatus according to the present embodiment is incorporated in a product production line in which a light transmissive container such as a plastic container, an ampule, or a vial is filled with a light transmissive liquid such as an injection solution, a nutrient, or a soft drink. This is a precondition for this. Specifically, as a transport system for inspection, a carry-in rotor 1 connected to a transport conveyor C from the upstream side of the production line and receiving a product M to be inspected, and a product M received by the carry-in rotor 1 for inspection A conveying rotor 2 that conveys the product M, an inspection product M that has been inspected from the conveying rotor 2 into a non-defective product and a defective product, an unloading rotor 3 that also serves as a sorting unit, and a non-defective conveyor 4 that is connected to the unloading rotor 3 and unloads the non-defective product And a defective product conveyor 5 which is connected to the carry-out rotor 3 and carries out defective products.

また容器に充填の液体中に混入している異物の検査のために製品Mを回転(自転)させる回転付与系として、搬送ロータ2に一定間隔で配列して設けられ、そこに載せられた製品Mに回転を与えることができるように形成された複数の回転ユニット11、回転ユニット11による製品Mの回転のタイミングなどを決めるのに用いられる搬送ロータ2の機械角度を検出する角度検出器12、および回転ユニット11の作動を制御する回転制御部13を備えている。そしてその回転制御部13には、角度検出器12からの機械角度情報を処理する角度情報部14、回転ユニット11が有している後述のモータを制御するモータ制御部15、および回転ユニット11における後述のような回転パターンを指示・入力するための回転パターン指示部16が設けられている。   In addition, as a rotation imparting system for rotating (spinning) the product M for the inspection of the foreign matter mixed in the liquid filled in the container, the product placed on the transport rotor 2 is arranged at regular intervals and placed on the product. A plurality of rotating units 11 formed so as to be able to give rotation to M; an angle detector 12 for detecting a mechanical angle of the transport rotor 2 used to determine the timing of rotation of the product M by the rotating unit 11; And a rotation control unit 13 for controlling the operation of the rotation unit 11. The rotation control unit 13 includes an angle information unit 14 that processes machine angle information from the angle detector 12, a motor control unit 15 that controls a motor described later included in the rotation unit 11, and the rotation unit 11. A rotation pattern instruction unit 16 for instructing and inputting a rotation pattern as described later is provided.

さらに異物用の検査系として、検査のために製品Mの検査画像を撮影するカメラ21、カメラ21による撮影のための照明光源22、および照明光源22と製品Mの間に異物像形成手段として設けられる異物像形成板23を含んでなる撮影系を備え、またカメラ21からの検査画像を処理して異物の有無を判定する検査処理部24を備えている。そしてその検査処理部24には、画像間差分取得処理手段25と異物検出処理手段26が設けられている。この検査処理部24でなされる処理と異物像形成板23の構成については後述する。   Further, as an inspection system for foreign matter, a camera 21 that captures an inspection image of the product M for inspection, an illumination light source 22 for photographing by the camera 21, and a foreign matter image forming unit between the illumination light source 22 and the product M are provided. An imaging system including a foreign object image forming plate 23 is provided, and an inspection processing unit 24 that processes an inspection image from the camera 21 to determine the presence or absence of foreign substances. The inspection processing unit 24 is provided with an inter-image difference acquisition processing unit 25 and a foreign matter detection processing unit 26. The processing performed by the inspection processing unit 24 and the configuration of the foreign matter image forming plate 23 will be described later.

回転ユニット11は、一例として図2のような構成とされる。この例の回転ユニット11は、容器Bに液体Liを充填してなる製品Mを載せて回転させる回転台31、回転台31上で製品Mを上から固定するように保持する保持キャップ32、回転台31を回転駆動するモータ33、およびモータ33の回転数を検出する回転数検出手段であるエンコーダ34を有した構成となっている。そしてエンコーダ34で得られる回転数情報は回転制御部13に送られ、モータ33は回転制御部13による制御を受けて作動する。   The rotation unit 11 is configured as shown in FIG. 2 as an example. The rotating unit 11 of this example includes a rotating base 31 that rotates a product M filled with liquid Li in a container B, a holding cap 32 that holds the product M on the rotating base 31 so as to be fixed from above, A motor 33 that rotationally drives the table 31 and an encoder 34 that is a rotational speed detection means for detecting the rotational speed of the motor 33 are provided. The rotation speed information obtained by the encoder 34 is sent to the rotation control unit 13, and the motor 33 operates under the control of the rotation control unit 13.

以下では本検査装置でなされる異物検査について説明する。図3に異物検査処理の流れを示す。異物の検査においては、まず回転ユニット11により製品Mつまり容器Bに回転を与える(処理101)。この回転は、容器Bの回転停止後にも容器B中の充填液体Liに十分な回転を残せるようなものとして行う。次いで容器Bの回転を停止させる(処理102)。それから容器Bが停止し、充填液体Liだけが容器B内で回転している状態で容器Bを透かして充填液体Liの静止画像を検査画像として複数枚撮影する(処理103)。この撮影は、図1における検査処理部24からの制御を受けてカメラ21を搬送ロータ2による製品M(容器B)の搬送に追従させる状態に動かしながら行う。またこのカメラ21との動きに対応させて照明光源22と異物像形成板23も動かすようにするのが好ましい。   Hereinafter, the foreign substance inspection performed by this inspection apparatus will be described. FIG. 3 shows the flow of foreign object inspection processing. In the inspection of the foreign matter, first, the rotation unit 11 rotates the product M, that is, the container B (processing 101). This rotation is performed so that sufficient rotation can be left in the filling liquid Li in the container B even after the rotation of the container B is stopped. Next, the rotation of the container B is stopped (process 102). Then, the container B is stopped, and a plurality of still images of the filling liquid Li are taken as inspection images through the container B with only the filling liquid Li rotating in the container B (processing 103). This imaging is performed while moving the camera 21 to follow the conveyance of the product M (container B) by the conveyance rotor 2 under the control of the inspection processing unit 24 in FIG. Further, it is preferable that the illumination light source 22 and the foreign object image forming plate 23 are also moved corresponding to the movement with the camera 21.

ここで、異物像形成板23は、規則的なパターンが付された光透過性の平板体であり、その規則的なパターンにより、充填液体Li中の光透過性の異物に像を形成させる。すなわち充填液体Liに混入している異物が光透過性でその光透過率が充填液体Liのそれと近いと、単なる照明光の透過や反射ではその像を検査画像中に形成させることができない。しかしそのような異物でもその屈折率は充填液体Liのそれと異なる場合がほとんどである。つまり屈折率についてみると、光透過性の異物が充填液体Li中で異屈折率領域を形成しているといえる。このような異物による異屈折率領域が存在する充填液体Liを透過させるようにして異物像形成板23の規則的パターンをカメラ21で捉えるようにすると、その規則的パターンに異屈折率領域により歪みを生じる。つまり異物像形成板23における規則的パターンの像の歪みとして検査画像中に光透過性の異物の像を形成させることができる。   Here, the foreign material image forming plate 23 is a light-transmitting flat plate with a regular pattern, and an image is formed on the light-transmissive foreign material in the filling liquid Li by the regular pattern. That is, if the foreign matter mixed in the filling liquid Li is light transmissive and its light transmittance is close to that of the filling liquid Li, the image cannot be formed in the inspection image by simple transmission or reflection of illumination light. However, the refractive index of such foreign matter is almost different from that of the filling liquid Li. In other words, regarding the refractive index, it can be said that the light-transmitting foreign matter forms a different refractive index region in the filling liquid Li. When the regular pattern of the foreign matter image forming plate 23 is captured by the camera 21 so as to transmit the filling liquid Li in which the different refractive index region due to such foreign matter exists, the regular pattern is distorted by the different refractive index region. Produce. That is, an image of a light-transmitting foreign material can be formed in the inspection image as a regular pattern image distortion on the foreign material image forming plate 23.

このことから分るように、異物像形成手段である異物像形成板23における規則的パターンは、充填液体Liに混入している異物のサイズよりも小さなパターン間隔を有していることが望ましい。一方、パターンそのものには特に制限はなく、例えば横縞パターンや格子パターンあるいはその他の適宜なパターンを用いることができる。ただ、画像処理などによりパターン像の歪みを検出する際に、その検出をより容易になせるようにするという点では、できるだけ単純なパターンが好ましく、その代表的な例は横縞パターンである。また異物像形成手段を異物像形成板23として構成する場合には、図1に示すように、照明光源22と製品Mの間に異物像形成板23を設け、照明光源22で背後から照らし出された異物像形成板23の規則的パターンが充填液体Liを透過してカメラ21で捉えられるという配置で撮影系を形成する必要がある。   As can be seen from the above, it is desirable that the regular pattern on the foreign material image forming plate 23 as the foreign material image forming means has a pattern interval smaller than the size of the foreign material mixed in the filling liquid Li. On the other hand, the pattern itself is not particularly limited, and for example, a horizontal stripe pattern, a lattice pattern, or other appropriate patterns can be used. However, when detecting distortion of a pattern image by image processing or the like, a pattern as simple as possible is preferable in that it can be detected more easily, and a typical example is a horizontal stripe pattern. When the foreign object image forming means is configured as the foreign object image forming plate 23, as shown in FIG. 1, a foreign object image forming plate 23 is provided between the illumination light source 22 and the product M, and the illumination light source 22 illuminates from behind. It is necessary to form an imaging system in such an arrangement that the regular pattern of the foreign object image forming plate 23 that has passed through the filling liquid Li is captured by the camera 21.

異物像形成板23の規則的パターンとして横縞パターンを用いた場合の検査画像の例を模式化して図4に示す。容器B中で回転している充填液体Liは、その液面に凹面を形成する状態を呈している。一般的にそうであるように容器Bが円柱である場合、この充填液体Liは、そこを透過する光に対してレンズ効果を発揮する。そのため異物像形成板23における横縞パターンPの像Pfは横方向に拡大された状態で検査画像に現れる。そして充填液体Li中に光透過性の異物があれば、それが横縞パターンPfに歪みPdとして現れる。また歪みPdは、充填液体Liが回転しており、これに伴って異物も動いていることから、複数枚の検査画像において異なる位置に現れる。そこで、画像間差分取得処理手段25により複数枚の検査画像間で差分をとり(処理104)、その結果に基づいて異物検出処理手段26により異物の有無を判定する(処理105)。これは、上述したように、例えば容器Bに付着している汚れなども光透過性の異物と同様に異屈折率領域を形成する場合があり、それが異物として誤認されるのを防止するためである。それから最後に異物有無の判定結果に基づいて製品の選別を行う(処理107)。この選別処理で不良品とされた製品は、搬出ロータ3により機械的に選別されて不良品コンベア5へ向けられる。   An example of an inspection image when a horizontal stripe pattern is used as the regular pattern of the foreign object image forming plate 23 is schematically shown in FIG. The filling liquid Li rotating in the container B is in a state of forming a concave surface on the liquid surface. In general, when the container B is a cylinder as is the case, the filling liquid Li exhibits a lens effect on the light transmitted therethrough. Therefore, the image Pf of the horizontal stripe pattern P on the foreign material image forming plate 23 appears in the inspection image in a state of being enlarged in the horizontal direction. If there is a light transmissive foreign substance in the filling liquid Li, it appears as a distortion Pd in the horizontal stripe pattern Pf. Further, the strain Pd appears at different positions in a plurality of inspection images because the filling liquid Li rotates and the foreign matter moves accordingly. Therefore, a difference between a plurality of inspection images is obtained by the inter-image difference acquisition processing means 25 (process 104), and the presence / absence of a foreign substance is determined by the foreign substance detection processing means 26 based on the result (process 105). This is because, as described above, for example, dirt attached to the container B may form a different refractive index region in the same manner as the light-transmitting foreign matter, and this is prevented from being mistaken as a foreign matter. It is. Then, finally, product selection is performed based on the determination result of the presence or absence of foreign matter (process 107). The product determined to be defective in this sorting process is mechanically sorted by the carry-out rotor 3 and directed to the defective product conveyor 5.

以上のように、本発明では、規則的なパターンが付された異物像形成板を用いることにより、光透過率が充填液体のそれにきわめて近い異物でも検査画像中に捉えることができるようにしている。したがって本発明によれば、従来の検査画像手法ではその検出が困難であった異物でも容易に検出することができるようになり、異物検査の精度をより一層高めることが可能となる。なお検査装置は異物検査の他にもいくつかの検査をなせるようにされるのが通常であるが、それらについては図示を省略し、説明も省略する。   As described above, in the present invention, by using a foreign matter image forming plate with a regular pattern, foreign matter whose light transmittance is very close to that of the filling liquid can be captured in the inspection image. . Therefore, according to the present invention, it is possible to easily detect a foreign object that has been difficult to detect with the conventional inspection image technique, and it is possible to further increase the accuracy of the foreign object inspection. In addition to the foreign substance inspection, the inspection apparatus is usually adapted to perform several inspections, but these are not shown and will not be described.

以上の実施形態は、規則的なパターンが付された光透過性の平板体の形態で形成した異物像形成板23を異物像形成手段として用いる場合であったが、異物像形成手段には、このような異物像形成板23の他に種々の形態が可能である。例えば液晶板で異物像形成板を形成し、それを電気的に制御して規則的なパターンを生成させる構成も可能である。また例えば照明光源22に規則的なパターンを付すことで異物像形成手段を照明光源22と一体化させて設けるような構成も可能である。さらに例えば液晶装置やCRT装置などを照明光源として用い、その照明光源自体に規則的パターンを生成させる形態も可能である。   In the above embodiment, the foreign object image forming plate 23 formed in the form of a light-transmitting flat plate with a regular pattern is used as the foreign object image forming unit. In addition to the foreign object image forming plate 23, various forms are possible. For example, it is possible to form a foreign image forming plate with a liquid crystal plate and generate a regular pattern by electrically controlling it. Further, for example, a configuration in which the foreign object image forming means is integrated with the illumination light source 22 by providing a regular pattern to the illumination light source 22 is also possible. Furthermore, for example, a liquid crystal device or a CRT device may be used as an illumination light source, and a regular pattern may be generated in the illumination light source itself.

本発明は、規則的なパターンにより異物についての像の形成を可能とする異物像形成手段を用いることにより、光透過率が充填液体のそれにきわめて近い異物でも検査画像中に捉えることができるようにしている。したがって本発明によれば、従来の検査画像手法ではその検出が困難であった異物でも容易に検出することができるようになり、異物検査の精度をより一層高めることが可能となる。このような検査技術は、例えば医薬品のように、より高度な品質管理が求められる製造分野に特に有効であり、そのような分野での製造技術の発展に大きく寄与することができる。   According to the present invention, by using a foreign substance image forming means that can form an image of a foreign substance with a regular pattern, a foreign substance whose light transmittance is very close to that of the filling liquid can be captured in the inspection image. ing. Therefore, according to the present invention, it is possible to easily detect a foreign object that has been difficult to detect with the conventional inspection image technique, and it is possible to further increase the accuracy of the foreign object inspection. Such an inspection technique is particularly effective in a manufacturing field where higher quality control is required, such as a pharmaceutical product, and can greatly contribute to the development of the manufacturing technique in such a field.

一実施形態による検査装置の構成を模式化して示す図である。It is a figure showing typically the composition of the inspection device by one embodiment. 回転ユニットの構成例を模式化して示す図である。It is a figure which shows typically the structural example of a rotation unit. 異物検査処理の流を示す図である。It is a figure which shows the flow of a foreign material inspection process. 検査画像の例を模式化して示す図である。It is a figure which shows typically the example of a test | inspection image.

符号の説明Explanation of symbols

11 回転ユニット
21 カメラ
22 照明光源
23 異物像形成板(異物像形成手段)
24 検査処理部
B 容器
Li 充填液体
DESCRIPTION OF SYMBOLS 11 Rotation unit 21 Camera 22 Illumination light source 23 Foreign material image formation board (foreign material image formation means)
24 Inspection processing part B Container Li filling liquid

Claims (1)

光透過率が容器内の充填液体に近く且つ屈折率が充填液体とは異なる充填液体中の異物を検出する容器充填液体の異物検査装置であって、A foreign matter inspection device for a container-filled liquid that detects foreign matter in a filled liquid having a light transmittance close to that of the filled liquid in the container and having a refractive index different from that of the filled liquid,
照明光源と検出対象容器との間に設けた、上記異物よりもパターン間隔が小さく且つ規則的なパターンが形成された異物像形成板と、  A foreign object image forming plate provided between the illumination light source and the detection target container, in which a pattern interval is smaller than the foreign substance and a regular pattern is formed,
容器を異物検査のために回転パターンを与えて回転させその後で停止させる制御手段と、  A control means for rotating the container by giving a rotation pattern for foreign object inspection, and then stopping the container;
回転の停止後の、容器内充填液体の回転中の少なくとも異なる2つのタイミングで、上記異物像形成板を透過して容器を介して得られる第1、第2の透過光を撮像するカメラと、  A camera for imaging the first and second transmitted light obtained through the container through the foreign substance image forming plate at at least two different timings during rotation of the filling liquid in the container after the rotation is stopped;
上記カメラでの第1、第2の撮影画像の差分をとり異物像形成板対応のパターン映像に歪みがあるか否かを検査し、歪みがあるときに異物があるものと判定する処理手段と、  Processing means for taking a difference between the first and second captured images of the camera and inspecting whether or not the pattern image corresponding to the foreign object image forming plate is distorted and determining that there is a foreign object when there is distortion; ,
を備える容器充填液体の異物検査装置。  A foreign matter inspection apparatus for liquid filling a container.
JP2003304061A 2003-08-28 2003-08-28 Container foreign matter inspection system Expired - Fee Related JP4177204B2 (en)

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