JP4743552B2 - Foreign matter inspection method, foreign matter inspection device, and illumination device for foreign matter inspection - Google Patents

Description

  The present invention relates to a method and apparatus for inspecting the presence or absence of foreign matter that has settled on the bottom of a container.

A method for inspecting for the presence or absence of opaque foreign matter in a container based on an image from the bottom side of the container is known (see Patent Document 1). In addition, by rotating the bottle to be inspected and collecting foreign substances expected to be mixed in the center of the bottom, a method of intensively inspecting the wrinkle area where foreign substances are present, tilting the bottle in a specific direction, There is also known a method for intensively inspecting a wrinkle region where foreign substances are collected by inclination.
JP-A-9-119904

  However, in the conventional method, there are several factors that adversely affect the inspection. For example, when a knurling part is formed at the lower end of the bottle or irregularities called petaloid are attached to the bottom surface of the bottle, those parts are excluded from the inspection range and become blind spots. If water drops or scratches are attached to the bottom of the bottle, the accuracy of the inspection may be affected by these effects.

  Accordingly, the present invention provides a foreign matter inspection method, a foreign matter inspection device, and a lighting device for foreign matter inspection that can detect an opaque foreign matter with higher accuracy than before regardless of the shape and state near the bottom surface of the container. And Furthermore, it is another object of the present invention to provide a foreign substance inspection apparatus capable of realizing an optimal illumination condition regardless of the type of contents and the illumination apparatus.

  The present invention solves the above-described problems by the following means. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiment.

The foreign matter inspection method of the present invention acquires an image from the bottom surface (2a) side of a container (2) that is permeable and has a bottomed cylindrical shape, and based on the image, the opaque foreign matter in the container In the foreign matter inspection method for inspecting for the presence or absence of light, the bottom surface of the container is illuminated by first illumination means (10) from above and illuminated by second illumination means (20) from the entire outer periphery. An image of the side of the container is taken, and the bottom surface side of the container is illuminated from below the outer periphery of the container by third illumination means (30 (FIG. 9)) from below the second illumination means. A reflected light image is taken, an inspection region of the container is determined based on the obtained reflected light image, and transmission on the bottom surface side of the container formed by illumination from above and on the outer periphery of the container with respect to the inspection region. Inspecting the presence or absence of foreign matter based on optical images Ri, to solve the problems described above (claim 1).

According to the present invention, by making illumination light incident on the container from various directions, the bottom surface side of the container is disturbed in light refraction and reflection such as uneven shape, water droplets, scratches, etc. Even if there are uneven portions, it is possible to make the illumination state of each portion uniform by superimposing illumination light from various directions, to suppress the unevenness of reflection in a specific direction, and to weaken or eliminate the shadow caused by the uneven portions. On the other hand, when an opaque foreign substance is deposited on the bottom of the container, the illumination light cannot pass from the deposit position of the foreign substance to the outside of the container. Therefore, when the container is photographed from the bottom surface side, the brightness is generally increased in the area other than the foreign object, while the brightness is decreased in the foreign object part, and the contrast between the foreign object and the other part is increased. As a result, foreign matters can be easily detected by image processing, and inspection accuracy is improved. In the reflected light image that is taken by illuminating the bottom side of the container from below the outer periphery, the reflected light intensity increases at the edge of the uneven part on the bottom surface of the container. The department can be clearly understood. Thus, even when the illumination by the first and second illumination means is not performed, even when the shadow of the uneven portion cannot be completely eliminated, a measure is taken so that the shadow of the uneven portion is not mistakenly recognized as a foreign object. Therefore, the accuracy and reliability of inspection can be improved.

In the foreign matter inspection method of the present invention, the concept of illumination includes both direct illumination in which light from the light emitting means is directly applied to the container and indirect illumination in which light from the light emitting means is reflected on the reflection surface and then applied to the container. The illumination range from the outer peripheral side of the container does not need to be ensured until the container has made a complete round.For example, even if illumination is omitted on a part of the outer periphery of the container to support the container, the shadow due to the uneven part If the illumination range is secured in the circumferential direction of the container so as to be weakened to the extent that does not hinder the inspection, it is included in the range of “illumination from all around”. The illumination range from the outer peripheral side does not need to cover the entire height of the container, and the illumination range may be omitted at the lower part of the container, for example.

The illumination of the container may be selected as appropriate, but as an example, the illumination from the bottom side of the container is performed with visible light, and the illumination from the upper and outer peripheral sides of the container is performed with infrared light. (Claim 2 ). By selectively using visible light and infrared light, the reflected light image and the transmitted light image can be clearly distinguished and imaged. Further, when the wavelength range of visible light irradiated from the bottom side of the container is matched with the wavelength range in which a complementary color relationship is established with respect to the color of the container (Claim 3 ), the color of the container and the illumination light As a result, the reflected light image of the container becomes an image based on an achromatic color (gray), and the contrast between the singular point where the reflected light intensity is high and the other background portion is increased. As a result, the edge of the concavo-convex portion can be specified more clearly. Note that “the color of the container” does not mean the color of the container material itself, but the color that is finally observed by the viewer by combining the colors of the container material and the contents. For example, if the container is transparent and the content is a colored transparent liquid such as Japanese tea, the color of the container is represented by the color of the content. If both the container and the contents are colored and transparent, the color obtained by adding the two corresponds to the color of the container.

Furthermore, in the foreign matter inspection method of the present invention, the edge portion of the concavo-convex portion attached to the bottom surface of the container is specified from the reflected light image of the container, and the inspection region is determined so as to avoid the edge portion. (Claim 4 ). If the inspection area is set in this way, as long as it is determined whether or not there is a luminance area corresponding to a foreign object for only the inspection area in the inspection based on the transmitted light image, the inspection accuracy is improved due to the influence of the uneven portion on the bottom surface of the container. No fear of getting worse. In other words, the inspection can be performed with high accuracy without being affected by the uneven portions present on the bottom surface of the container.

In the foreign substance inspection method of the present invention may be tested transparent or whether translucent foreign material in the container based on the reflected light image (claim 5). While transparent or translucent foreign matter may not be clearly captured in the transmitted light image, the reflected light intensity increases at the edge of the foreign matter in the reflected light image, and the presence of the foreign matter is similar to the edge portion of the uneven portion. Will be able to grasp.

The foreign matter inspection apparatus of the present invention acquires an image from the bottom surface (2a) side of a container (2) that is permeable and has a bottomed cylindrical shape, and based on the image, the opaque foreign matter in the container In the foreign matter inspection apparatus for inspecting the presence / absence of the above, a first illuminating means (10) for illuminating the container from above and a second illuminating means (20) for illuminating the container from the entire outer periphery thereof. A third illuminating means (30 (FIG. 9)) is provided below the second illuminating means so as to illuminate the bottom surface side of the container from the obliquely lower periphery of the outer periphery , and the first and second illuminating means are provided. The above-described problem is solved by irradiating the illumination light in the infrared region and the third illumination device irradiating the illumination light in the visible region .

According to this foreign matter inspection apparatus, the first illumination means and the second illumination means can illuminate the container from above and from the entire circumference on the outer circumference side, and can take an image on the bottom side. A reflected light image on the bottom surface side of the container is picked up by the third illumination means, and an inspection area can be selected based on the reflected light image. Therefore, for the same reason as described above for the foreign matter inspection method, it becomes possible to easily detect foreign matter by image processing by enlarging the contrast between the foreign matter deposited on the bottom of the container and the other portions, Inspection accuracy is improved.

In the foreign matter inspection apparatus according to the present invention, the illumination range by the second illumination means does not need to be ensured until the container has completely gone around. For example, illumination is omitted at a part of the outer periphery of the container to support the container. Even in such a case, if the illumination range is secured in the circumferential direction of the container so that the shadow due to the concavo-convex portion is weakened to the extent that does not hinder the inspection, it is included in the range of “illumination from the entire circumference”. The illumination range by the second illumination means does not need to cover the entire height of the container. For example, the illumination range may be omitted at the lower part of the container.

Before Symbol third illumination means MAY irradiates illumination light of the wavelength region complementary relation is established with respect to the color of the container (claim 7). Advantage of aspects of this are as previously described in particle inspection method described above. Moreover, in the aspect which uses both illumination in the infrared region and illumination in the visible region, the first imaging means (4A) that captures an image formed by infrared light and the image formed by visible light are captured. A second imaging means (4B), and a light beam irradiated from the first and second illumination means and transmitted through the container below the container is supplied to the first imaging means. Distributing means (53) for distributing the light beam reflected by the container irradiated from the illuminating means to the second imaging means may be provided (claim 8 ). Such dispensing means, a light beam in the infrared region is transmitted to the first imaging means side, a cold mirror for reflecting the light beam in the visible region to the second imaging means are available (Claim 9) . If such a distribution means is used, the transmitted light image by infrared illumination is guided to the first imaging means, and the reflected light image by visible illumination is guided to the second imaging means, respectively. The image can be used properly according to each application. In addition, there is an advantage that both images can be clearly separated even when infrared illumination and visible illumination are used simultaneously.

The foreign matter inspection apparatus of the present invention acquires an image from the bottom surface (2a) side of a container (2) that is permeable and has a bottomed cylindrical shape, and based on the image, the opaque foreign matter in the container In the foreign matter inspection apparatus for inspecting the presence / absence of the above, a first illuminating means (10) for illuminating the container from above and a second illuminating means (20) for illuminating the container from the entire outer periphery thereof. A third illuminating means (30 (FIG. 9)) is provided below the second illuminating means so as to illuminate the bottom surface side of the container from the obliquely lower periphery of the container . A first imaging means (4A) for picking up a transmitted light image on the bottom surface side of the container formed by illumination from the second illumination means, and a bottom surface of the container formed by illumination from the third illumination means and a second imaging means for imaging a reflected light image of the side (4B) And it allows to solve the problems described above (claim 10). In the case where the third illuminating unit is provided so as to illuminate the bottom surface side of the container from the obliquely lower periphery of the outer periphery, the first imaging unit, the second imaging unit, and the second imaging unit are used regardless of whether the infrared region and the visible region are used separately. You may make it provide an imaging means. For example, even if the illumination light is all in the visible range, the transmitted light image and the reflected light image are different by changing the wavelength range and limiting the wavelength range of the light beam guided to each imaging means using a filter or the like. Foreign matter inspection can be performed by acquiring in the wavelength range.

In the foreign matter inspection apparatus of the present invention, when the first and second imaging means are provided, the inspection area of the container is further determined based on the reflected light image captured by the second imaging means, A determination unit (5) for determining the presence or absence of a foreign substance based on the transmitted light image captured by the first imaging unit with respect to the inspection region may be provided (Claim 1 1 ). By providing such a determination means, the foreign matter inspection method of the present invention can be carried out efficiently.

The determination unit may identify an edge portion of the concavo-convex portion attached to the bottom surface of the container from the reflected light image, and determine the inspection region so as to avoid the edge portion. 2 ). Further, the determination means may further determine the presence or absence of a transparent or translucent foreign substance in the container based on the reflected light image (Claim 1 3 ). The technical significance of these aspects is as described for the foreign substance inspection method.

  In the foreign matter inspection apparatus of the present invention, the concept of illumination includes both direct illumination in which light from the light emitting means is directly applied to the container and indirect illumination in which light from the light emitting means is reflected on the reflection surface and then applied to the container. Therefore, either one of the first or second illumination means may be only indirect illumination. For example, the first lighting unit and the second lighting unit can be configured in the following manner.

In the foreign matter inspection apparatus of the present invention, the first illuminating means includes a light emitter (12), and the second illuminating means is provided so as to cover the container from the outer peripheral side, and the light emission is provided on the inner surface side. reflecting surface for reflecting the illumination light from the vessel (21a) is optionally provided with full cylindrical body which is provided over the circumference (21) of said container (claims 1-4). In this case, the first illumination unit functions as direct illumination and the second illumination unit functions as indirect illumination with respect to the container.

In the foreign matter inspection apparatus of the present invention, the second illumination means includes a cylindrical light emitter (23) provided so as to cover the container from the outer peripheral side, and the inner surface side emits light over the entire periphery of the container, It said first illuminating means may comprise a lid reflecting surface for reflecting illuminating light from the tubular light emitter on the lower surface (13a) is provided (13) (claim 1 5). In this case, the second illumination unit functions as direct illumination and the first illumination unit functions as indirect illumination with respect to the container.

In the foreign matter inspection apparatus of the present invention, the first illumination means includes a light emitter (12), and the second illumination means is provided so as to cover the container from the outer peripheral side, and the inner surface side of the entire container is the whole. You may provide the cylindrical light-emitting device (22) which light-emits over a periphery (Claim 16 ). In this case, the first illumination unit and the second illumination unit each function as direct illumination.

  The first illuminating unit and the second illuminating unit may function as indirect illumination in parallel with direct illumination by providing a reflecting surface in combination with the light emitter.

The illuminating device of the present invention is an illumination used for a foreign matter inspection device that inspects the presence or absence of foreign matter by photographing a transparent container (2) formed in a bottomed cylindrical shape from the bottom surface (2a) side. A device comprising: a first illuminating means (10) for illuminating the container from above; and a second illuminating means (20) for illuminating the container from the entire outer periphery thereof, Below the illumination means, there is provided third illumination means (30 (FIG. 9)) so as to illuminate the bottom side of the container from obliquely below the outer periphery thereof, and the first and second illumination means are red. irradiating the illumination light of external region, said third illumination means is a shall be irradiated with illumination light of the visible region (claim 1 7). Third illumination means for irradiating illumination light in the visible range, may be irradiated with illumination light in a wavelength range a complementary color relationship is established with respect to the color of the container (claim 18) in is al. According to these illumination devices, the above-described foreign matter inspection device can be realized.

  As described above, according to the foreign matter inspection method and apparatus of the present invention, by making illumination light incident on the container from various directions, light such as irregularities, water droplets, scratches, etc. are incident on the bottom surface of the container. Even if there is a factor causing disturbance in refraction and reflection, the illumination state of each part is made uniform by superimposing the illumination light from various directions to suppress the unevenness of reflection in a specific direction, and the shadow by the uneven part is weakened. Or can be eliminated. On the other hand, when an opaque foreign substance is deposited on the bottom of the container, the illumination light cannot pass from the deposit position of the foreign substance to the outside of the container. Therefore, when the container is photographed from the bottom surface side, the brightness is generally increased in the area other than the foreign object, while the brightness is decreased in the foreign object part, and the contrast between the foreign object and the other part is increased. As a result, foreign matters can be easily detected by image processing, and the inspection accuracy can be improved as compared with the prior art.

FIG. 9 shows a foreign substance inspection apparatus according to an embodiment of the present invention. This foreign matter inspection apparatus is obtained by changing a part of the foreign matter inspection apparatus shown in FIGS. 1 to 5. Prior to the description, the foreign matter inspection apparatus shown in FIGS. 1 to 5 will be described as a reference example. Figure 1 shows a particle inspection apparatus according to an embodiment of the first reference example of the present invention. The foreign matter inspection apparatus 1 images the container 2 from the bottom surface 2a side, which is disposed below the acrylic plate 3 and a transparent acrylic plate 3 as a supporting means for supporting the container 2 to be inspected with its bottom surface 2a down. A camera 4 and an image processing device 5 that performs predetermined processing on the image output from the camera 4 and inspects for the presence of foreign matter are provided. The container 2 to be inspected is, for example, a plastic bottle having permeability and formed in a bottomed cylindrical shape. The container 2 is filled with a beverage, and the mouth of the container 2 is sealed with a cap CP.

  Above the acrylic plate 3, a first illuminating means 10 for illuminating the container 2 from above and a second illuminating means 20 for illuminating the container 2 from substantially the entire circumference on the outer peripheral side thereof are provided. The first illumination means 10 includes a light source 11, a light emitter 12 that emits illumination light from the light source 11 toward the container 2, and a lid 13 that covers the upper surface side of the light emitter 12. The light emitter 12 is formed in a ring shape, and is arranged coaxially with the center line CL of the container 2 and somewhat above the container 2. The light emitter 12 irradiates illumination light toward the container 2 from a light emitting surface 12a provided over almost the entire inner periphery thereof. The lower surface of the lid 13 is configured as a reflective surface 13a capable of reflecting the illumination light of the light emitter 12 over the entire surface. Therefore, the first illumination means 10 functions as direct illumination that illuminates the container 2 with illumination light from the light emitter 12 and indirect illumination that illuminates the container 2 with reflected light from the reflection surface 13 a of the lid 13.

  The second lighting means 20 includes a cylindrical body 21 provided so as to cover the entire circumference of the container 2. The cylindrical body 21 has a cylindrical shape, and its upper end is fitted to the outer periphery of the light emitter 12 and its lower end is in contact with the acrylic plate 3. The inner surface of the cylindrical body 21 is configured as a reflecting surface 21 a that reflects the illumination light from the light emitter 12 over the entire surface. Thereby, the 2nd illumination means 20 functions as indirect illumination using the illumination light inject | emitted from the light-emitting device 12. FIG.

  The camera 4 includes a zoom lens 4a and a signal generation unit 4b. The signal generation unit 4b includes an image sensor using a semiconductor element such as a CCD or CMOS, and outputs an image signal corresponding to the luminance distribution in the photographing range set in the field of view of the lens 4a. The magnification of the zoom lens 4 a is adjusted so that the image output from the camera 4 completely includes the bottom surface 2 a of the container 2. Further, a filter 4c is mounted on the front surface of the lens 4a. The filter 4c selectively transmits only light in a specific wavelength region to be used for inspection among the light included in the illumination light emitted from the light emitter 12.

  Although the wavelength range which the filter 4c permeate | transmits may be selected suitably, it can set to a near infrared region and a visible region, for example. Regarding the light source 11 or the light emitter 12, only light in the wavelength region used for inspection may be emitted. In this case, the signal generation unit 4b of the camera 4 also needs to be configured to correspond to the transmission region of the filter 4c, and the reflection surfaces 13a and 21a also need to be configured to have a high reflectance with respect to the transmission region of the filter 4c. For example, when using an image with illumination light in the near infrared region or visible region, the reflecting surfaces 13a and 21a are preferably white.

  Next, a foreign matter inspection method using the foreign matter inspection apparatus 1 will be described. Here, it is assumed that the container 2 is filled with contents having a property of transmitting the illumination light from the light emitter 12. However, it does not matter whether the contents are colored as long as the illumination light is transmitted. Examples of such contents include drinking water, tea, cider, and cola drinks.

  In order to inspect the presence or absence of foreign matter using the foreign matter inspection apparatus 1, first, the lid 13 is opened, the container 2 is installed in the cylindrical body 21, and the lid 13 is closed again. Then, illumination light is irradiated from the light emitter 12, an image from the bottom surface 2 a side of the container 2 is taken by the camera 4, and the image is output to the image processing device 5.

  According to the above inspection method, the illumination light from the light emitter 12 is directly incident on the container 2 and is reflected by the reflecting surfaces 13 a and 21 a and is incident on the container 2. Therefore, illumination light enters the container 2 from various directions. Accordingly, even if irregularities such as knurling or petaloid are formed on the lower end side of the container 2, water droplets adhere to the bottom surface 2 a of the container 2, or scratches are formed on the bottom surface 2 a of the container 2, various angles The shadows due to the uneven portions are weakened by the incident light from the light. The influence of the body 2b and the shoulder 2c of the container 2 can be similarly suppressed. Accordingly, the overall brightness of the container 2 in the image is increased.

On the other hand, when an opaque foreign matter is deposited in the container 2, the illumination light is blocked by the foreign matter regardless of the color of the foreign matter, and the light cannot pass from the bottom surface 2 a of the container 2 to the camera 4. Accordingly, the brightness of the foreign matter precipitation portion in the image is relatively lowered. As described above, according to the reference example of the present invention , it is possible to enlarge the contrast between the foreign object and the other background portion. Accordingly, the image processing apparatus 5 can easily and reliably detect the foreign matter using the contrast. For example, it is possible to determine the presence or absence of foreign matter by setting a threshold value between the brightness of the foreign matter and the brightness of other portions to binarize the image and inspecting the presence or absence of black spots in the binarized image. Furthermore, when the container 2 is photographed with the camera 4, if the exposure condition is set so that the brightness of the region other than the foreign substance in the image is saturated, the binarization process is unnecessary, and the image processing apparatus 5 can further easily. Foreign matter can be discriminated. Moreover, according to the foreign substance inspection apparatus 1 of FIG. 1, since the whole bottom surface 2a of the container 2 is image | photographed, the blind spot of a test | inspection can be eliminated and the reliability and reliability of a test | inspection can be improved. The exposure may be adjusted on the camera 4 side, or the exposure may be adjusted by changing the intensity of illumination light from the light emitter 12.

The reference example of the present invention is not limited to the above embodiment, and may be implemented in various forms. Hereinafter, some other embodiments will be described with reference to FIGS.

In a second reference example embodiment of the foreign matter inspection apparatus 1 shown in FIG. 2, the light source 11 and the emitter 12 of the first illumination means 10 is omitted. On the other hand, in the second illumination means 20, instead of the cylindrical body 21 (FIG. 1) in FIG. 1, a cylindrical light emitter 23 that emits illumination light from the light source 22 toward the container 2. And are provided. The upper end of the cylindrical light emitter 23 is higher than the cap CP, and the lower end is in contact with the acrylic plate 3. On the inner surface side of the cylindrical light emitter 23, a cylindrical light emitting surface 23a extending over the entire circumference of the container 2 is provided. The cylindrical light emitter 23 irradiates illumination light from the light source 22 toward the container 2 from the light emitting surface 23a. The lid 13 of the first illumination means 10 is put on the upper end of the cylindrical light emitter 23. And the lower surface of the cover body 13 is comprised as the reflective surface 13a which can reflect the illumination light from the cylindrical light-emitting device 23. FIG.

  In this embodiment, the 1st illumination means 10 functions as indirect illumination which reflects the illumination light from the cylindrical light-emitting device 23 with the lid body 13, and illuminates the container 2, and the 2nd illumination means 20 emits cylindrical light emission. It functions as direct illumination for illuminating the container 2 with illumination light from the vessel 23. Also in this embodiment, illumination light can be incident on the container 2 from various directions as in the example of FIG. 1, so that foreign matter can be reliably detected regardless of the shape of the container 2 and the color of the foreign matter. Can do.

In the third particle inspection apparatus 1 of the embodiment of the reference example shown in FIG. 3, the first illuminating means 10 shown in FIG. 1, is combined with a second illumination means 20 shown in FIG. 2 Yes. In this example, the container 2 is directly illuminated by the light emitter 12 or 22 from above and from the side, and the container 2 is indirectly illuminated by the lid 13. Even in such an illumination method, illumination light can be incident on the container 2 from various directions as in the examples of FIGS. 1 and 2, so that foreign matter can be removed regardless of the shape of the container 2 and the color of the foreign matter. It can be detected reliably. The light emitters 12 and 22 may irradiate illumination light in various wavelength ranges as needed, but preferably when the light emitters 12 and 22 emit illumination light in a wavelength range that the filter 4c passes. Good.

Figure in the fourth reference example embodiment of the foreign matter inspection apparatus 1 shown in 4, the lower end of the second tubular body 21 of the illumination means 20 is shortened in the vertical direction of the tubular body 21 shown in FIG. 1 A gap is formed between the illuminating plate 3 and the acrylic plate 3, and a third illumination means 30 is provided there. The third illumination means 30 includes a light source 31 and a light emitter 32 that emits illumination light from the light source 31 toward the container 2. The light emitter 32 is formed in a ring shape, and is disposed so as to be coaxial with the center line CL of the container 2 and to face the lower end portion of the container 2. The light emitter 32 irradiates illumination light toward the container 2 from a light emitting surface 32a provided over almost the entire inner periphery thereof.

  According to the foreign substance inspection apparatus 1 in FIG. 4, by using the first illumination means 10 and the second illumination means 20, the presence or absence of foreign matters in the container 2 can be determined as in the foreign substance inspection apparatus 1 in FIG. 1. Can be inspected. On the other hand, when the contents of the container 2 are cloudy (for example, when the contents are a fruit juice drink or a milk drink), the illumination light from the light emitter 12 diffuses around the container 2 and is output from the camera 4. The brightness of the bottom surface 2a is lower than the brightness around the container 2 and it becomes difficult to detect foreign matter. In such a case, the illumination by the first illumination means 10 and the second illumination means 20 is stopped, and the lower end portion of the container 2 is extended from the outer periphery to the entire periphery by the light emitter 32 of the third illumination means 30. The container 2 may be photographed from the bottom surface 2a side while illuminating. While the illumination from the light emitter 32 is limited to the vicinity of the bottom surface 2a of the container 2 to diffuse the illumination light to increase the luminance near the bottom surface 2a, the light emitter 12, the lid 13 and the cylindrical shape are formed on the top of the container 2. The body 21 can block outside light and relatively reduce its luminance. Thereby, in the image of the bottom surface 2a of the container 2, the brightness of the foreign matter is lowered and the brightness of the region other than the foreign matter is increased to increase the contrast, and the foreign matter detection accuracy can be increased.

In the embodiment of the fifth reference example shown in FIG. 5, only the substantially upper half of the container 2 is covered with the cylindrical body 21 of the second illumination means 20, and the outer periphery of the lower half of the container 2 is the third illumination means. Although it is not provided with 30, it is opened without being covered with the cylindrical body 21. Thus, by making the outer periphery of the container 2 relatively large, it is possible to perform an inspection while holding the body portion 2b of the container 2 with a chuck device or the like. If the body 2b of the container 2 is grasped and supported, there is no need to support the bottom surface 2a side of the container 2, so the acrylic plate 3 can be omitted. In the example of FIG. 5, instead of the acrylic plate 3, a Fresnel lens 6 is provided to face the bottom surface 2a. However, it is not necessary to support the container 2 with the Fresnel lens 6. When the container 2 is observed from the camera 4 side through the Fresnel lens 6, the rising portion 2 d located at the boundary between the bottom surface 2 a and the body portion 2 b of the container 2 is developed on the outer peripheral side of the bottom surface 2 a by the refractive action of the Fresnel lens 6. Imprinted. Therefore, by checking the presence or absence of foreign matter on the bottom surface 2a side without being affected by the rising portion 2d, the region corresponding to the rising portion 2d is excluded from the inspection region in the image obtained through the Fresnel lens 6. it can. In the example of FIG. 5, the diameter of the cylindrical body 21 is substantially matched with the inner diameter of the light emitting surface 12a. The configuration in which the upper half of the container 2 is covered with the second illumination means 20 can also be applied to the embodiment of FIG. 2 or FIG. 1 to 4, the Fresnel lens 6 may be used instead of or in addition to the acrylic plate 3.

  6 to 8 show images when opaque foreign substances are introduced into the PET bottle and the PET bottle is photographed from the bottom side by the foreign substance inspection apparatus 1 of FIG. 4 together with comparative examples thereof. In these drawings, the foreign matter is circled.

  FIG. 6 shows an image when the contents are water, FIG. 7 shows an image when the contents are tea, and in each figure (a) shows a case where the cylindrical body 21 is removed and the container 2 is photographed, and (b) shows The cases where the lid 13 and the cylindrical body 21 are attached and the light emitter 12 is turned on are shown. However, illumination by the light emitter 32 is not used. As is clear from these figures, when the container 2 is covered and the container 2 is illuminated from above and from the entire outer periphery, the shadow of the uneven part (the petaloid in this example) of the bottom surface 2a of the container 2 is observed. The influence can be eliminated and only foreign objects can be regarded as black spots. Thus, the illumination by the 1st illumination means 10 and the 2nd illumination means 20 is suitable for the detection of the sediment foreign material in case the content has permeability | transmittance like water or tea.

  FIG. 8 shows an image when the content is orange juice of 100% natural fruit juice. (A) is an image when the lid body 13 and the cylindrical body 21 are covered, and the light emitters 12 and 32 are both turned off. (B) shows images when the lid 13 and the cylindrical body 21 are covered, the light emitter 12 is turned off, and the light emitter 32 is turned on. In the case of orange juice, the incident light to the container 2 is diffused by the contents. Therefore, even when illuminated from the top of the container 2, the brightness of the bottom surface of the container 2 does not increase and the bottom surface 2a is photographed as a dark field. If the illumination means 30 of 3 is illuminated from the outer peripheral side of the lower end part of the container 2, the bottom surface 2a can be brightened and image | photographed, and a deposit foreign material can be detected.

The reference example of the present invention is not limited to the above embodiment, and may be implemented in various forms. For example, as apparent from the embodiment of FIG. 5, the lower end of the second illuminating unit may be shifted upward from the lower end of the container regardless of whether or not the third illuminating unit is provided. The support of the container is not limited to that by the acrylic plate 3. For example, a gap may be provided in the cylindrical body, and an arm that supports the body 2b of the container 2 may be extended into the cylindrical body from the gap. The third illumination means may be combined with the embodiment of FIG. 2 or FIG.

FIG. 9 shows a foreign substance inspection apparatus according to an embodiment of the present invention using the first to third illumination means 10, 20, and 30 . In this embodiment, first illumination means 10 and second illumination means 20 that are substantially the same as those in the embodiment of FIG. 5 are provided, and third illumination means 30 is provided below the second illumination means 20. ing. In the embodiment of FIG. 9, instead of the combination of the light source 11 and the light emitter 12 shown in FIG. 5, light emission in which a number of LEDs (not shown) as light sources are arranged along the ring-shaped light emitting surface 50a. A vessel 50 is provided in the first illumination means 10. Also in the third illumination means 30, instead of the combination of the light source 31 and the light emitter 32 shown in FIG. 4, a large number of LEDs (not shown) as light sources are arranged along the ring-shaped light emitting surface 51a. The light emitter 51 is provided. The light emitting device utilizing an LED can be of course used also in the embodiment of the first to fifth reference example described above. The light emitters 50 and 51 emit light by supplying power from a common power supply circuit 52, but an independent power supply circuit may be provided for each light emitter.

  As indicated by an arrow in FIG. 9, the light emitter 50 of the first illumination means 10 illuminates the upper end side of the container 2 from the obliquely upper periphery of the container 2, and the light emitter 51 of the third illumination means 30 is the bottom surface of the container 2. The 2a side is illuminated obliquely from below the outer periphery. The light emitter 50 emits near-infrared illumination light, and the light emitter 51 emits visible light. For example, an infrared LED is used as the LED of the light emitter 50, and an LED that emits visible light is used as the LED of the light emitter 51.

  The wavelength range of the illumination light of the light emitter 51 is preferably matched with the wavelength range in which a complementary color relationship is established with respect to the color of the container 2. For example, when the material of the container 2 is transparent and the content is tea, the color of the container 2 is brown or yellow, so if a blue LED is used as the LED constituting the light emitter 51, the illumination light and the color of the container 2 A complementary color relationship is established between the two. When such a complementary color relationship is established, the illumination light of the light emitter 51 and the color of the container 2 are mixed to form an achromatic color, so that the original color of the container 2 is observed in the reflected light image of the bottom surface 2a. The contrast between the marked portion and the other colors is increased. For example, if the bottom surface 2a is provided with a concavo-convex portion such as a petaloid, the edge portion of the concavo-convex portion exhibits a color different from the color of the contents by reflecting external light or the like. And the other parts become high, and the edge part can be easily detected.

  A first camera (first imaging unit) 4A and a second camera (second imaging unit) 4B are provided below the center line CL of the container 2. The first camera 4A picks up a transmitted light image on the bottom surface 2a side of the container 2 illuminated by the first illumination means 10 and the second illumination means 20 as in the example of FIG. 5, and the second camera 4B The reflected light image on the bottom surface 2a side of the container 2 illuminated by the third illumination means 30 is captured. In order to sort the captured images in this way, a cold mirror 53 as a distribution unit is provided between the cameras 4A and 4B and the container 2. The cold mirror 53 transmits the infrared light beam of the light beam guided from the bottom surface 2a of the container 2 to the first camera 4A side and reflects the visible light beam to the second camera 4B side. Further, the filter 4c of the first camera 4A transmits only wavelengths in the near infrared region, and the filter 4c of the second camera 4B transmits only wavelengths in the visible region. With such a configuration, the first camera 4A captures a transmitted light image of the bottom surface 2a by the illumination light irradiated by the first and second illumination means 10 and 20, and the second camera 4B is the third illumination means. The reflected light image of the bottom surface 2a by the illumination light irradiated at 30 can be taken. Moreover, the light emitters 50 and 51 may remain turned on at the same time, and it is not necessary to turn off the illumination for the other image while taking one of the transmitted light image and the reflected light image.

In each of the cameras 4A and 4B, the image captured by the zoom lens 4a is converted into an image signal corresponding to the luminance distribution by the signal generation unit 4b in the same manner as in the above-described embodiments of the reference example. 5 is output. The image processing device 5 is configured as a computer using a microprocessor, determines an inspection region of the bottom surface 2a of the container 2 using an image signal output from the first camera 4A, and the second camera 4B relates to the inspection region. The presence or absence of foreign matter is determined using the output image signal.

  10 to 12 show examples in which image signals output from the first camera 4A and the second camera 4B are printed out. (A) in each figure is a transmitted light image, and (b) is a reflected light image. Correspond. FIG. 12 shows an example of a carbonated drink, and FIGS. 13 and 14 show an example of tea, respectively. As is apparent from these drawings, even when the first illumination unit 10 and the second illumination unit 20 are used, depending on the illumination conditions, the dark portion appears in the image of the edge portion of the concavo-convex portion attached to the bottom surface 2a of the container 2. In some cases, the edge portion may be erroneously determined as a foreign object due to the influence of the dark portion. On the other hand, in the reflected light image using the third illumination means 30 from the bottom surface 2a side, the brightness of the edge portion is clearly higher than the brightness of the other portions. Therefore, if the edge portion is identified from the reflected light image, the inspection area is set so as to be excluded, and it is determined whether or not there is a dark spot in the transmitted light image with respect to the inspection area, the bottom surface 2a. It is possible to carry out highly accurate foreign matter inspection that is not affected by the uneven portions of the surface.

  FIG. 13 and FIG. 14 show a procedure in which the image processing apparatus 5 inspects the presence or absence of a foreign substance using such a principle. Hereinafter, these will be described.

  FIG. 13 shows an inspection area determination routine executed by the image processing apparatus 5 to determine the inspection area of the bottom surface 2a from the reflected light image captured by the second camera 4B. In the inspection area determination routine, first, in step S11, an image signal corresponding to the reflected light image output from the second camera 4B is binarized with an appropriate threshold value, and an area where the brightness of reflected light from the bottom surface 2a is high (bottom reflection). Region). This process corresponds to, for example, a process of identifying a portion with high luminance in the reflected light images of FIGS. 10B, 11B, and 12B.

  In the next step S12, the image signal corresponding to the vicinity of the center of the bottom surface 2a is removed as an unnecessary signal. Depending on the container 2, there is a case where a circular convex portion is present in the vicinity of the center of the bottom surface 2a, and the possibility that only the inside of the image of the convex portion is erroneously recognized as a detection region is excluded. is there. In the subsequent step S13, the region corresponding to the inside of the bottom reflection region extracted in step S11 is painted, that is, painted with a certain luminance value as a candidate for the inspection region. Note that the bottom reflection region referred to here is a region on the inner side of the portion that draws the closed curve of the container 2 in the region divided into the higher luminance side by the binarization in step S11. The painted area is a candidate for the inspection area. When there are a plurality of closed curves as shown in FIG. 11 (b) or 12 (b), for example, the inside of the outermost circular drawing portion is painted as a bottom reflection region. Further, in step S14, matching information (for example, information on the center of gravity position and the center position) expressing the characteristics of the area is acquired from the filled area (inspection area candidate). In the next step S15, a predetermined deformation process is performed on the inspection area to adjust its shape. For example, the illumination light is reflected in the very vicinity of the bottom reflection region, and an isolated point may be generated in addition to the foreign matter. Therefore, the region painted in step S13 is deformed so as to be somewhat narrowed toward the center side of the container 2. To do. In step S16, the deformed area is determined as an inspection area, and data necessary for identifying the shape and size of the inspection area is recorded in a memory provided in the image processing apparatus 5. The inspection area determination routine is thus completed. Note that the routine of FIG. 13 may be executed each time a reflected light image having a different shape is input to the second camera 4B. However, the routine of FIG. 13 may be executed every time the container 2 to be inspected is replaced.

  Next, the foreign matter determination routine of FIG. 14 will be described. This routine is executed by the image processing apparatus 5 in order to determine the presence or absence of foreign matter related to the inspection area. In the first step S21, the image processing device 5 performs a predetermined smoothing process (smoothing process) on the image signal output from the first camera 4A. This is because the brightness of isolated points other than the foreign matter included in the transmitted light image is averaged to reduce the probability that these isolated points are detected. In subsequent steps S22 to S24, an isolated point (dark spot) in the transmitted light image captured by the first camera 4A is searched in three stages of small, medium, and large. The isolated point search is a process for comparing the luminance of the target point on the transmitted light image with the luminance of the pixel located at a predetermined distance from the target point to determine whether the target point is an isolated point. It is. In short, the process of determining the isolated point by switching the distance to the pixel to be compared with the attention point to three stages of small, medium, and large is performed. There is an advantage that even if another isolated point exists in the isolated point and on the distance to be compared with the attention point, the distance is changed and detected without omission. The isolated point search is performed over the entire area of the transmitted light image. Thereafter, in step S25, matching is performed between the inspection region determined by the routine of FIG. 13 and the image captured by the first camera 4A. In this process, the inspection area in the transmitted light image captured by the first camera 4A is specified using the information on the center of gravity and the center position acquired in step S14 in FIG. In the subsequent step S26, an area outside the inspection area specified by the matching is excluded from the inspection object.

  In the next step S27, the isolated points detected in the inspection area are masked out of the determination criteria as compared with the predetermined determination criteria. For example, when it is required to detect a foreign object of X mm or more, an isolated point having the number of pixels corresponding to a dimension smaller than X mm is masked and excluded from the determination target of the presence or absence of the foreign object. Further, in step S28, it is determined whether or not foreign matter still exists after masking. If it is determined that there is a foreign object, the process proceeds to step S29 to process the container 2 to be inspected as a defective product, and if it is determined that no foreign object exists, step S29 is skipped. Thus, the foreign matter discrimination processing routine is completed. In addition, a reference bottle that has been confirmed to be free of foreign matter in advance is prepared, and an image of an inspection region obtained by performing the routine of FIG. 13 on the reference bottle is stored as a reference image (template). For the actual container to be inspected, the processing in steps S21 to S24 in FIG. 14 may be performed to determine the presence or absence of foreign matter by comparison with the previous reference image. When a complicated pattern is formed in the inspection area as shown in FIG. 12B, a template including that pattern is acquired, and isolated points other than bright points on the template are found in the actual image to be inspected. The presence or absence of a foreign substance can be inspected depending on whether or not it exists.

The procedures in FIGS. 13 and 14 are merely examples, and the determination of the inspection area and the determination of the presence or absence of foreign matter in the inspection area may be performed by various methods. In one embodiment of the present invention, a transmitted light image on the bottom surface 2a side of the container 2 is acquired using near-infrared illumination light, and a reflected light image on the bottom surface 2a side of the container 2 using visible light. However, the wavelength range of the illumination light may be properly used according to the container to be inspected and its contents. Even in the visible range, it is possible to distinguish between the transmitted light image and the reflected light image using different wavelength ranges. It is also possible to selectively use the near infrared region and the far infrared region. Furthermore, the inspection method according to an embodiment of the present invention is not limited to the bottom surface 2a of the container 2 and can be applied to various cases where uneven portions that deteriorate the foreign matter detection accuracy remain in the vicinity of the inspection region. That is, even when inspecting a predetermined range including uneven portions other than the bottom surface 2 a of the container 2, the reflected light image is obtained by illuminating the predetermined range from a predetermined direction, and the uneven portion is extracted from the reflected light image. Determine the inspection area so as to exclude the edge part, illuminate the inspection area from the opposite side, take the transmitted light image, and extract the dark spot from the transmitted light image, etc., and determine the presence or absence of foreign matter do it.

  In the routine of FIG. 14, the presence / absence of foreign matter is performed based on the transmitted light image captured by the first camera 4A. However, the reflected light image captured by the second camera 4B is used in the routine of FIG. May be. For example, transparent or opaque foreign matters such as cellophane tape and pieces of bottles may not be detected in the transmitted light image taken by the first camera 4A because near infrared rays are transmitted. However, when these foreign matters are attached to the bottom of the container 2, the reflected light intensity of the edges of the foreign matters is increased in the same manner as the edges of the concavo-convex portions. Can be seen as a bright spot. Therefore, after determining the inspection area, if it is determined whether or not an isolated bright point exists in the inspection area using the reflected light image captured by the second camera 4B, such transparent or translucent foreign matter is also surely obtained. Can be detected.

  In the embodiment described above, the cylindrical body 21 of the second illumination means 20 is configured in a cylindrical shape, but the cylindrical body of the present invention may be configured by combining a plurality of parts in the circumferential direction into a cylindrical shape. Good. An example thereof is shown in FIGS.

  In the embodiment of FIGS. 15 and 16, the pair of semi-cylindrical covers 62 and 63 are combined to form the cylindrical body 21. That is, as shown in FIG. 15, a plurality of semi-cylindrical covers 62 and 63 are attached to the outer periphery of a pair of rotating bodies 60 and 61 (only one is shown) at a constant pitch. The rotating bodies 60 and 61 are driven to rotate around the respective rotating shafts 60a and 61a in the opposite directions at the same rotational speed. The container 2 is held by one of the rotating bodies 60 (61 may be used) via a holding mechanism 64 and is conveyed in synchronization with the rotating body 60. At the inspection position P1 where the rotators 60 and 61 are closest, the covers 62 and 63 of the rotators 60 and 61 are combined so that their respective tips are somewhat overlapped, and thereby the cylindrical body 21 around the container 2. Is configured. By covering the cylindrical body 21 with the first illumination means 10, a cylindrical body 21 similar to that shown in FIG. 5 or 9 can be realized. According to this embodiment, it is convenient that the container 2 can be taken in and out of the cylindrical body 21 only by transporting the container 2 in a certain direction. Note that the third illumination means 30, the cameras 4A and 4B, the Fresnel lens 6, the cold mirror 53, and the like are disposed below the container 2 at the inspection position P1.

  In the embodiment of FIG. 5 described above, the third illumination means 30 is used to determine the presence or absence of foreign matter in the container filled with the turbid liquid. However, the embodiment is used for foreign matter inspection only for the turbid liquid. In the case of limitation, only the third illumination means 30 may be provided as shown in FIG. In the example of FIG. 17, a ring-shaped light emitter 70 is disposed further below the bottom surface 2 a of the container 2, and illumination is emitted from the light emitter 70 upward to the container 2 and substantially parallel to the center line CL. Light is reflected on the center line CL side of the container 2 by the reflecting surfaces 71 a of the pair of semicircular reflectors 71, 71, and the transmitted light image of the bottom surface 2 a illuminated by the reflected light is transmitted through the Fresnel lens 6. 4 is imaged. As the light source of the light emitter 70, for example, a near infrared LED can be used. In place of or in addition to the covers 62 and 63 shown in FIGS. 15 and 16, the reflectors 71 are attached to the rotating bodies 60 and 61, and the Fresnel lens 6, the light emitter 70, and the camera 4 are installed below the inspection position P1. Thus, the configuration of FIG. 17 can be realized.

Sectional drawing of the foreign material inspection apparatus which concerns on embodiment of the 1st reference example of this invention. Sectional drawing of the foreign material inspection apparatus which concerns on embodiment of the 2nd reference example of this invention. Sectional drawing of the foreign material inspection apparatus which concerns on embodiment of the 3rd reference example of this invention. Sectional drawing of the foreign material inspection apparatus which concerns on embodiment of the 4th reference example of this invention. Sectional drawing of the foreign material inspection apparatus which concerns on embodiment of the 5th reference example of this invention. The figure which showed an example of the image image | photographed while illuminating the container using the 1st and 2nd illumination means in the foreign material inspection apparatus of 4th Embodiment with the comparative example. The figure which showed the other example of the image image | photographed while illuminating the container using the 1st and 2nd illumination means in the foreign material inspection apparatus of 4th Embodiment with the comparative example. The figure which showed an example of the image image | photographed while illuminating the container using the 3rd illumination means in the foreign material inspection apparatus of 4th Embodiment with the comparative example. Sectional drawing of the foreign material inspection apparatus which concerns on one form of this invention. The figure which shows an example of the image image | photographed with the foreign material inspection apparatus of FIG. The figure which shows the other example of the image image | photographed with the foreign material inspection apparatus of FIG. The figure which shows the further another example of the image image | photographed with the foreign material inspection apparatus of FIG. 6 is a flowchart illustrating an inspection area determination routine performed by the image processing apparatus according to an embodiment of the present invention . 6 is a flowchart illustrating a foreign matter determination routine performed in the image processing apparatus according to an aspect of the present invention . The fragmentary top view of the foreign material inspection apparatus which combines a pair of semi-cylindrical covers and comprises a cylindrical body. The figure which shows the state which looked at the foreign material inspection apparatus of FIG. 15 from the arrow XVI direction of the same figure. The figure which shows the foreign material inspection apparatus suitable when the container is filled with the turbid content.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foreign substance inspection apparatus 2 Container 2a Bottom face 3 Acrylic board 4 Camera 4A 1st camera (1st imaging means)
4B Second camera (second imaging means)
5 Image processing device (determination means)
DESCRIPTION OF SYMBOLS 10 1st illumination means 11 Light source 12 Light emitter 13 Cover body 13a Reflective surface 20 2nd illumination means 21 Cylindrical body 21a Reflective surface 22 Light source 23 Cylindrical light emitter 23a Light emission surface 30 3rd illumination means 31 Light source 32 Light emission Device 32a Light emitting surface 50 Light emitting device (first illumination means)
51 Light emitter (third illumination means)
53 Cold mirror (distribution means)
62, 63 Cover (tubular body)

Claims (18)

In a foreign matter inspection method for obtaining an image from the bottom side of a container having permeability and having a bottomed cylindrical shape, and inspecting for the presence or absence of opaque foreign matter in the container based on the image, the container is Illuminate with the first illumination means from above , and illuminate with the second illumination means from the entire circumference on the outer periphery side to capture the image on the bottom side,
From the lower side of the second illuminating means, the third illuminating means illuminates the bottom surface side of the container from obliquely below the outer periphery thereof to capture a reflected light image on the bottom surface side of the container, and the obtained reflected light image is obtained. An inspection area of the container is determined based on the inspection area, and the presence or absence of a foreign substance is inspected based on a transmitted light image on the bottom surface side of the container formed by illumination from above and on the outer periphery of the container with respect to the inspection area. Foreign substance inspection method.   The foreign matter inspection method according to claim 1, wherein illumination from the bottom side of the container is performed with visible light, and illumination from above and around the outer periphery of the container is performed with infrared light.   The foreign matter inspection method according to claim 2, wherein a wavelength range of visible light irradiated from the bottom side of the container is matched with a wavelength range in which a complementary color relationship is established with respect to the color of the container.   The edge region of the uneven portion on the bottom surface of the container is specified from the reflected light image of the container, and the inspection region is determined so as to avoid the edge portion. The foreign substance inspection method described in 1.   The foreign matter inspection method according to claim 1, wherein presence or absence of a transparent or translucent foreign matter in the container is inspected based on the reflected light image. In a foreign substance inspection apparatus that acquires an image from the bottom side of a container that is permeable and has a bottomed cylindrical shape, and inspects for the presence or absence of opaque foreign substances in the container based on the image,
First illumination means for illuminating the container from above;
Second illuminating means for illuminating the container from the entire outer periphery thereof;
With
Below the second illuminating means, a third illuminating means is provided so as to illuminate the bottom surface side of the container from the obliquely lower periphery thereof ,
It said first and second illumination means irradiates illumination light in the infrared region, the third illumination means is foreign substance inspection apparatus characterized that you irradiates illumination light of the visible range. The foreign matter inspection apparatus according to claim 6 , wherein the third illumination unit irradiates illumination light in a wavelength region in which a complementary color relationship is established with respect to the color of the container. A first imaging unit that captures an image formed by infrared light; and a second imaging unit that captures an image formed by visible light. The first and second units are disposed below the container. The light beam irradiated from the illumination unit and transmitted through the container is distributed to the first imaging unit, and the beam reflected from the container irradiated from the third illumination unit is distributed to the second imaging unit. The foreign matter inspection apparatus according to claim 6 , further comprising a distribution unit. A cold mirror is provided as the distributing means, which transmits a light beam in an infrared region to the first image pickup device side and reflects a light beam in a visible region toward the second image pickup device. The foreign matter inspection apparatus according to 8 . In a foreign substance inspection apparatus that acquires an image from the bottom side of a container that is permeable and has a bottomed cylindrical shape, and inspects for the presence or absence of opaque foreign substances in the container based on the image,
First illumination means for illuminating the container from above;
Second illuminating means for illuminating the container from the entire outer periphery thereof;
With
Below the second illuminating means, a third illuminating means is provided so as to illuminate the bottom surface side of the container from the obliquely lower periphery thereof,
The first imaging unit that captures a transmitted light image on the bottom surface side of the container formed by illumination from the first and second illumination units, and the illumination that is formed by illumination from the third illumination unit. particle inspection apparatus characterized in that a second imaging means for imaging a bottom side of the reflected light image of the container. Determination of determining the inspection area of the container based on the reflected light image captured by the second imaging unit, and determining the presence or absence of foreign matter based on the transmitted light image captured by the first imaging unit with respect to the inspection area The foreign matter inspection apparatus according to any one of claims 8 to 10 , further comprising means. The determination means according to claim 1 1, characterized in that said from the reflected light image to identify the edges of the concave-convex portion attached to the bottom of the vessel, determines the examination region so as to avoid the edge portion The foreign matter inspection apparatus described in 1. Said determining means, particle inspection apparatus according to claim 1 2, characterized by further determining the transparency or whether translucent foreign material in the container based on the reflected light image. The first illuminating means includes a light emitter, and the second illuminating means is provided so as to cover the container from the outer peripheral side, and an inner surface has a reflective surface for reflecting illumination light from the light emitter. foreign substance inspection apparatus according to any one of claims 6-1 3, characterized in that it comprises a tubular body which is provided over the entire circumference of the container. The second illumination means includes a cylindrical light emitter that is provided so as to cover the container from the outer peripheral side, and the inner surface side emits light over the entire circumference of the container, and the first illumination means is provided on the lower surface side. foreign substance inspection apparatus according to any one of claims 6-1 3 for reflecting surface for reflecting illuminating light is characterized in that it comprises a cover which is provided from the tubular light emitter. The first illuminating means includes a light emitter, and the second illuminating means includes a cylindrical light emitter that is provided so as to cover the container from the outer peripheral side and whose inner surface emits light over the entire periphery of the container. foreign substance inspection apparatus according to any one of claims 6-1 3, characterized in that is. An illuminating device used in a foreign matter inspection apparatus that inspects the presence or absence of foreign matter by photographing a transparent and container formed in a bottomed cylindrical shape from its bottom side, and illuminates the container from above First illuminating means, and second illuminating means for illuminating the container from the entire outer periphery thereof,
Below the second illuminating means, there is provided third illuminating means for illuminating the bottom surface side of the container from obliquely below the outer periphery thereof , and the first and second illuminating means are illuminating lights in the infrared region. irradiating the said third illumination means illuminating device for foreign matter inspection, it characterized that you irradiates illumination light of the visible range. The foreign matter inspection apparatus according to claim 17 , wherein the third illumination unit irradiates illumination light in a wavelength region in which a complementary color relationship is established with respect to the color of the container.

Images