JP7486807B2 - Foreign body inspection device and foreign body inspection method - Google Patents

Description

The present invention relates to a device for inspecting for foreign objects in a container filled with contents.

As a method for inspecting the presence or absence of foreign matter in a liquid filled in a container, a method for inspecting the presence or absence of reflected light from foreign matter and a method for inspecting the presence or absence of light-blocking portions due to foreign matter have been conventionally used. The former method is suitable for detecting foreign matter that reflects light, such as glass fragments, and is sometimes called white detection. The latter method is suitable for detecting foreign matter that blocks light, such as black foreign matter, and is sometimes called black detection. Inspection devices used for these methods require different configurations of the illumination system depending on the difference in detection principle, so traditionally, they have been configured as devices dedicated to each method. On the other hand, as an inspection device that can use both methods, an inspection device has been proposed that has an illumination system suitable for white detection and an illumination system including a strobe light source suitable for black detection, a camera for each illumination system, and the illumination system for white detection is continuously lit while the illumination system for black detection is intermittently lit, and when the strobe light source is lit, the shutter of the camera for black detection is closed to allow each camera to capture an image for white detection and an image for black detection (see Patent Document 1).

Japanese Patent Application Laid-Open No. 07-092109

The inspection device in Patent Document 1 is capable of detecting both light-reflecting and light-blocking foreign bodies. However, when the strobe light source is illuminated, the container is also illuminated from the other lighting system, so even if a powerful strobe light source is used, there is a significant effect of interference between the two types of light. As separate cameras are provided for each lighting system, there are corresponding limitations to the miniaturization of the device and the reduction in the number of parts.

The present invention aims to provide a foreign body inspection device that is capable of detecting both light-reflecting foreign bodies and light-blocking foreign bodies, and that is advantageous in terms of size and number of parts.

A foreign body inspection device according to one aspect of the present invention is a foreign body inspection device comprising: an illumination means for illuminating a container filled with a liquid; an imaging means for photographing the container to obtain an electronic image of the container; a processing means for inspecting the container for the presence or absence of a foreign body based on the image obtained by the imaging means; and a control means for controlling the illumination means and the imaging means so that an image of the container illuminated by the illumination means is obtained, wherein the illumination means includes a first illumination section provided so that reflected light from the foreign body in the container is incident on the imaging means, and a second illumination section provided so that transmitted light through the container is incident on the imaging means, and the imaging means is a processing means for inspecting the container for the presence or absence of a foreign body based on the image obtained by the imaging means. The means includes a camera that is shared for photographing the container illuminated by the first lighting unit and for photographing the container illuminated by the second lighting unit , the camera being configured to photograph the container from the bottom side, the first lighting unit being configured to illuminate the bottom of the container from the side, and the second lighting unit being configured to illuminate the container from above, and the control means controls each lighting unit so that the same container is illuminated alternately by the first lighting unit and the second lighting unit, and controls the camera so that the container illuminated by the first lighting unit and the container illuminated by the second lighting unit are photographed sequentially.

A foreign body inspection method according to one embodiment of the present invention is a foreign body inspection method which illuminates a container filled with liquid with an illumination means, photographs the illuminated container with an imaging means to obtain an electronic image of the container, and inspects the container for the presence or absence of foreign bodies based on the obtained image, wherein the illumination means is provided with a first illumination unit arranged so that reflected light from the foreign body in the container is incident on the imaging means, and a second illumination unit arranged so that transmitted light through the container is incident on the imaging means, the imaging means is provided with a camera which is shared for photographing the container illuminated by the first illumination unit and the container illuminated by the second illumination unit , the camera is arranged to photograph the container from the bottom side, the first illumination unit is arranged to illuminate the bottom of the container from the side, and the second illumination unit is arranged to illuminate the container from above, each illumination unit is controlled so that the same container is alternately illuminated by the first illumination unit and the second illumination unit, and the camera is controlled so that the container illuminated by the first illumination unit and the container illuminated by the second illumination unit are photographed sequentially.

FIG. 1 is a diagram showing a foreign matter inspection device according to an embodiment of the present invention. FIG. 2 is a diagram showing a modification of the foreign matter inspection apparatus of FIG. 1 . FIG. 2 is a diagram showing another modified example of the foreign matter inspection apparatus of FIG. 1 . 3 is a timing chart showing the temporal relationship between the operations of the various parts when the foreign matter inspection device of FIG. 1 or FIG. 2 is used; 4 is a timing chart showing the temporal relationship between the operations of the various parts when the foreign matter inspection device of FIG. 3 is used.

Figure 1 shows the configuration of the main parts of a foreign body inspection device according to one embodiment of the present invention. The foreign body inspection device 1 is for inspecting the presence or absence of foreign bodies in a container 2. The container 2 to be inspected is filled with a liquid such as a beverage and sealed with a cap. The container 2 is made of a light-transmitting material and may be, for example, a glass bottle. The foreign bodies to be detected include both foreign body A, which has the property of reflecting light, and foreign body B, which has the property of blocking light.

The foreign body inspection device 1 includes an illumination device 10 as an example of an illumination means, and a camera 20 as an example of an imaging means. The illumination device 10 includes a first illuminator 11 as an example of a first illumination section, and a second illuminator 12 as an example of a second illumination section. The first illuminator 11 is provided to illuminate the lower part of the container 2, more preferably the vicinity of the bottom of the container 2 where the foreign body A is expected to settle, from its side. In FIG. 1, a pair of first illuminators 11 are provided so as to sandwich the container 2 in the radial direction. However, the number of first illuminators 11 may be changed as appropriate. On the other hand, the second illuminator 12 is provided to illuminate the container 2 from above. As an example, the second illuminator 12 is provided to illuminate the container 2 from its shoulder toward its bottom. The second illuminator 12 may be, for example, a ring-shaped illuminator arranged simultaneously with the container 2. In FIG. 1, the direction of the illumination light from each illuminator 11, 12 is indicated by an outlined arrow.

Each of the illuminators 11 and 12 is configured as a strobe light capable of emitting strong illumination light in a short time. The emission time of the illuminators 11 and 12 is set to approximately several tens of microseconds, for example. The illumination light emitted by each of the illuminators 11 and 12 is light in a wavelength range that is transparent to the container 2 and the liquid therein. As the light source for the illuminators 11 and 12, an LED, a xenon lamp, or other light source may be used as appropriate, so long as strobe emission is possible. The illuminators 11 and 12 may further include optical components such as lenses and mirrors for illuminating the container 2 within an appropriate range.

The camera 20 is set up to photograph the container 2 from its bottom side. The camera 20 has a solid-state imaging element such as a CMOS or CCD, and converts the optical image obtained by photographing the container 2 into an electronic image and outputs it. The field of view F of the camera 20 (the range between a pair of dashed lines in the figure) is set to include the entire bottom of the container 2. The camera 20 is used to photograph both the container 2 illuminated by the first illuminator 11 and the container 2 illuminated by the second illuminator 12. In other words, the camera 20 is used both as an imaging means corresponding to the illumination of the first illuminator 11 and as an imaging means corresponding to the illumination of the second illuminator 12.

The relationship between the camera 20 and the illuminators 11 and 12 is as follows. The first illuminator 11 is arranged to illuminate the bottom of the container 2 from the side. Therefore, if a foreign object A is present at the bottom of the container 2, the light irradiated from the first illuminator 11 is reflected by the foreign object A, and the reflected light is incident on the camera 20. Therefore, in the image of the container 2 illuminated by the first illuminator 11, the foreign object A appears as a bright area. Therefore, the first illuminator 11 functions as a so-called white detection illumination system. On the other hand, the second illuminator 12 is arranged to illuminate the container 2 from above. Therefore, the illumination light of the second illuminator 12 passes through the container 2 and enters the camera 20. If a foreign object B is present at the bottom of the container 2, the light irradiated from the second illuminator 12 is blocked by the foreign object B. Therefore, in the image of the container 2 illuminated by the second illuminator 12, the foreign object B appears as a dark area. Therefore, the second illuminator 12 functions as a so-called black detection illumination system. Even if the illumination light from the first illuminator 11 is blocked by foreign object B, the shadow of foreign object B does not appear in the image (first image) based on the illumination light from the first illuminator 11. Because the illumination light from the second illuminator 12 passes through foreign object A, the image of foreign object A does not appear in the image (second image) based on the illumination light from the second illuminator 12, or appears only with a slight brightness.

The foreign body inspection device 1 is further provided with an image processing device 30 and an inspection control device 40 to inspect the presence or absence of foreign bodies A and B by operating the illumination device 10 and the camera 20 in cooperation with each other. The image processing device 30 controls the shooting operation of the camera 20 and inspects the presence or absence of foreign bodies A and B by processing the image output from the camera 20 in a predetermined procedure. In this way, the image processing device 30 functions as an example of a processing means. As an example, the image processing device 30 may be configured by combining a control board such as a frame grabber that provides a shutter signal to the camera 20 and receives the obtained image, and a computer unit that processes the image received by the control board according to a predetermined algorithm to determine the presence or absence of foreign bodies A and B. The algorithm for inspection may be an existing algorithm for white detection and black detection, and a detailed explanation of this will be omitted.

The inspection control device 40 is responsible for various control processes required for the first illuminator 11 and the second illuminator 12 to operate in cooperation with the image processing device 30. For example, the inspection control device 40 controls the operation of the illuminators 11 and 12 so that, triggered by a predetermined inspection start signal, one of the first illuminator 11 and the second illuminator 12 emits light, and then the other emits light. It may be appropriately selected which of the illuminators 11 and 12 emits light first. In other words, the order in which the illuminators 11 and 12 emit light may be appropriately determined.

The inspection control device 40 instructs the image processing device 30 to have the camera 20 acquire an image in synchronization with the light emission operation of the illuminators 11 and 12, and to perform an inspection based on the acquired image. In response to the instruction, the image processing device 30 controls the shooting operation of the camera 20 so that the container 2 is photographed in synchronization with the light emission operation of the illuminators 11 and 12, and receives and processes the acquired image from the camera 20. Note that the inspection control device 40 may control the light emission operation of the illuminators 11 and 12 in cooperation with the control of the image processing device 30 by inputting an inspection start signal to the image processing device 30 and instructing the inspection control device 40 to perform a light emission operation from the image processing device 30. In any case, the image processing device 30 and the inspection control device 40 may cooperate to cause the illuminators 11 and 12 and the camera 20 to operate in cooperation. As a result, the image processing device 30 and the inspection control device 40 function as an example of a control means. If the control board of the image processing device 30 has a function of controlling an external device in cooperation with the shooting operation of the camera 20, the light emission operation of the first illuminator 11 and the second illuminator 12 may be controlled by the image processing device 30. In that case, the image processing device 30 functions as an example of a control means.

According to the foreign body inspection device 1 configured as described above, a single foreign body inspection device 1 is provided with a first illuminator 11 for white detection and a second illuminator 12 for black detection, and these illuminators 11, 12 emit light alternately, so there is no risk of interference between the illumination lights of the illuminators 11, 12, and there is no risk of the inspection accuracy being impaired due to the influence of one illumination appearing in an image based on the other illumination. Since the same camera 20 is shared for photographing the container 2 illuminated by each illumination unit 11, 12, the foreign body inspection device 1 can be made smaller and its installation space can be reduced. It is also possible to reduce the number of parts and cut costs.

In the above-described foreign body inspection device 1, the container 2 may be inspected in a stationary state or while being transported. When inspecting a container 2 while being transported, the time when the first illuminator 11 illuminates the container 2 differs from the time when the second illuminator 12 illuminates the container 2, and the container 2 moves between these illumination times. For example, in FIG. 2, if the center line of the container 2 illuminated by the first illuminator 11 is indicated by L1 and the center line of the container 2 illuminated by the second illuminator 12 is indicated by L2, the container 2 moves along the transport plane C by the distance d between the center lines L1 and L2 between these illumination times. In this case, the field of view F of the camera 20 must be set so that the container 2 can be photographed under either illumination.

In addition, when the container 2 being transported is to be inspected, it is preferable that the first illuminator 11 and the second illuminator 12 are arranged so as to be shifted by the distance d in the transport direction (indicated by the arrow D) in accordance with the position of the container 2 at the time of each illumination. In other words, it is preferable that the illuminators 11 and 12 are arranged so that the center of each illumination range approximately coincides with the center lines L1 and L2. In this case, the positions indicated by the center lines L1 and L2 correspond to the illumination positions of the illuminators 11 and 12. Furthermore, it is preferable that the camera 20 is arranged so that its photographing optical axis Lc is in a position that bisects the distance d between the center lines L1 and L2. In addition, since the second illuminator 12 is shifted to the upstream side in the transport direction and the first illuminator 11 is shifted to the downstream side in the transport direction in FIG. 2, the second illuminator 12 emits light first and the first illuminator 11 emits light later. If the light emission order is reversed, the illumination positions of the first illuminator 11 and the second illuminator 12 may be swapped from that shown in FIG. 2.

The offset (corresponding to distance d) between the illumination positions of the illuminators 11 and 12 can be determined by the size of the container 2, the transport speed, and the image transfer speed between the camera 20 and the image processing device 30. For example, if 600 containers 2 with a body diameter of 70 mm are transported per minute at intervals of 100 mm, the transport speed is 60 m per minute. If the time required to transfer an image from the camera 20 to the image processing device 30 is 10 milliseconds, the distance d between the illumination position (center line L1) of the first illuminator 11 and the illumination position (center line L2) of the second illuminator 12 is about 10 mm. With this level of offset, it is possible to capture the containers 2 at the illumination positions of the illuminators 11 and 12 within the field of view of a camera that is normally available on the market.

The time required to inspect the container 2 (takt time) may be affected not only by the transfer speed of the image from the camera 20 to the image processing device 30, but also by the time required for image processing in the image processing device 30. For example, the time required for inspection varies depending on the time required to obtain the judgment result of the presence or absence of foreign bodies A and B by processing each of the images based on the illumination light of the illuminators 11 and 12 after the image is transferred from the camera 20 to the image processing device 30. If the time is prolonged, even if the camera 20 can timely obtain the image for white detection and the image for black detection in synchronization with the transport of the container 2, the processing until the judgment result is obtained may not be able to keep up, and the adaptability to the increase in the transport speed of the container 2 may be impaired. In this way, when the processing speed of the image processing device 30 is insufficient, multiple processing units for performing image processing may be provided in the image processing device 30, and the processing of the image based on the illumination light by the first illuminator 11 and the processing of the image based on the illumination light by the second illuminator 12 may be performed by different processing units. An example is shown in FIG. 3.

In the example of FIG. 3, an image switcher 50 as an example of a switching means is provided between the camera 20 and the image processing device 30A, and a first processing unit 31 and a second processing unit 32 are provided in the image processing device 30A. The first processing unit 31 and the second processing unit 32 each correspond to the image processing device 30 shown in FIG. 1. That is, each processing unit 31, 32 controls the shooting operation of the camera 20, receives the obtained image, and performs various processes necessary for detecting foreign objects. The image switcher 50 selectively switches the output destination of the image acquired by the camera 20 between the first processing unit 31 and the second processing unit 32. The switching operation of the image switcher 50 is controlled by the inspection control device 40 as an example. For example, the inspection control device 40 controls the operation of the image switcher 50 so that when the first illuminator 11 emits light, the image of the camera 20 is output to the first processing unit 31, and when the second illuminator 11 emits light, the image of the camera 20 is output to the second processing unit 32. According to this example, different processing units are in charge of processing the image based on the illumination light of the first illuminator 11 and processing the image based on the illumination light of the second illuminator 12, so that the time required for inspection can be shortened and adaptability to faster transport speeds of the container 2 can be improved compared to when both images are processed by the same processing unit. Note that, although two processing units, the first processing unit 31 and the second processing unit 32, are provided in the example of FIG. 3, more processing units may be provided and the image switcher 50 may be controlled so that an appropriate processing unit is selected as the output destination of the image according to the shooting interval of the camera 20.

Figure 4 is an example of a timing chart showing the time relationship of the operations of each part when performing an inspection using the foreign body inspection device 1 of Figure 1 or Figure 2. In the figure, "OFF" indicates that the operation or processing is stopped, and "ON" indicates that the operation or processing is in progress. In the example of Figure 4, first, a light emission operation by the first illuminator 11 is started upon receiving a predetermined inspection start signal. When the camera 20 acquires an image in conjunction with the light emission of the first illuminator 11, the image is transferred from the camera 20 to the image processing device 30. When the image transfer is completed, the light emission operation of the second illuminator 12 is started. When the camera 20 acquires an image in conjunction with the light emission of the second illuminator 12, the image is transferred from the camera 20 to the image processing device 30. When the transfer is completed, the transferred image is processed in the image processing device 30 to determine the presence or absence of foreign bodies A and B, and when the processing is completed, the determination result is output from the image processing device 30.

Figure 5 is an example of a timing chart showing the time relationship of the operation of each part when performing an inspection using the foreign body inspection device 1 of Figure 3. In the figure, "OFF" indicates the stop of operation or processing, and "ON" indicates operation or processing. "1" or "2" attached to "Image processing" and "Judgment result output" indicate that "1" is processing by the first processing unit 31 and "2" is processing by the second processing unit 32, respectively. "Image output switching" indicates the operation of the image switcher 50 of Figure 3, "1" indicates that the output destination is the first processing unit 31, and "2" indicates that the output destination is the second processing unit 32. In the example of Figure 5, first, a predetermined inspection start signal is received and the first illuminator 11 starts emitting light, and at the same time, the image switcher 50 selects the first processing unit 31 as the output destination of the image. When the camera 20 acquires an image in cooperation with the emission of light by the first illuminator 11, the image is transferred from the camera 20 to the first processing unit 31 of the image processing device 30A. When the image transfer is completed, the first processing unit 31 performs image processing to determine whether or not a foreign object A exists, and the determination result is output from the first processing unit 31. Meanwhile, in parallel with the image processing by the first processing unit 31, the second illuminator 12 starts emitting light, and at the same time, the image switcher 50 selects the second processing unit 32 as the output destination of the image. When the camera 20 acquires an image in conjunction with the emission of light from the second illuminator 12, the image is transferred from the camera 20 to the second processing unit 32 of the image processing device 30A. When the transfer is completed, the second processing unit 32 performs image processing to determine whether or not a foreign object B exists, and the determination result is output from the second processing unit 32. In FIG. 5, the determination results are output separately from the processing units 31 and 32, but the image processing device 30A may be operated so that the determination results regarding the foreign objects A and B are output collectively by integrating the determination results of the processing units 31 and 32. In the examples of FIG. 4 and FIG. 5, the first illuminator 11 emits light first, but the second illuminator 12 may emit light first.

The present invention is not limited to the above-described embodiment, and may be embodied in an appropriate modified or altered form. For example, in the above embodiment, the camera 20 is disposed facing the bottom of the container 2, but the camera may be disposed in another position using optical components for changing the light path, such as a mirror or a prism. If a sufficient field of view cannot be secured by the camera alone, an optical component such as a lens for expanding the field of view may be added to the imaging means. As long as the position is suitable for capturing an image including foreign objects inside the container, the camera does not necessarily need to be positioned to capture the container from the bottom side.

The illumination means is not limited to the example including the first illuminator 11 and the second illuminator 12 shown in Figures 1 to 3. The configuration of the illumination means may be changed as appropriate as long as it includes a first illumination section arranged so that reflected light from a foreign object is incident on the imaging means, and a second illumination section arranged so that transmitted light through the container is incident on the imaging means.

Various aspects of the present invention derived from each of the above-mentioned embodiments and modifications are described below. In the following description, the corresponding components shown in the attached drawings are noted in parentheses to facilitate understanding of each aspect of the present invention, but this does not limit the present invention to the illustrated forms.

A foreign body inspection device (1) according to one aspect of the present invention is a foreign body inspection device comprising an illumination means (10) for illuminating a container (2) filled with liquid, an imaging means (20) for photographing the container and acquiring an electronic image of the container, a processing means (30, 30A) for inspecting the presence or absence of a foreign body in the container based on the image acquired by the imaging means, and a control means (30, 30A, 40) for controlling the illumination means and the imaging means so that an image of the container illuminated by the illumination means is acquired, and the illumination means is configured to illuminate the container so that reflected light from the foreign body in the container is incident on the imaging means. and a second illumination unit (12) arranged so that light transmitted through the container is incident on the imaging means, the imaging means includes a camera (20) shared for photographing the container illuminated by the first illumination unit and the container illuminated by the second illumination unit, and the control means controls each illumination unit so that the same container is alternately illuminated by the first illumination unit and the second illumination unit, and controls the camera so that the container illuminated by the first illumination unit and the container illuminated by the second illumination unit are photographed sequentially.

The foreign body inspection method according to one aspect of the present invention is a foreign body inspection method that illuminates a container (2) filled with liquid with an illumination means (10), photographs the illuminated container with an imaging means (20) to obtain an electronic image of the container, and inspects the presence or absence of a foreign body in the container based on the obtained image. The illumination means is provided with a first illumination unit (11) that is arranged so that reflected light from the foreign body in the container is incident on the imaging means, and a second illumination unit (12) that is arranged so that transmitted light from the container is incident on the imaging means. The imaging means is provided with a camera (20) that is shared for photographing the container illuminated by the first illumination unit and the container illuminated by the second illumination unit. Each illumination unit is controlled so that the same container is alternately illuminated by the first illumination unit and the second illumination unit, and the camera is controlled so that the container illuminated by the first illumination unit and the container illuminated by the second illumination unit are photographed sequentially.

According to the above aspect, the presence or absence of light-reflecting foreign bodies can be inspected based on an image of the container illuminated by the first illumination unit, and the presence or absence of light-blocking foreign bodies can be inspected based on an image of the container illuminated by the second illumination unit. Since illumination by the first illumination unit and illumination by the second illumination unit are performed alternately, there is no risk of interference between the two illuminations impairing the inspection accuracy. Since a camera is shared for photographing the container illuminated by the first illumination unit and the container illuminated by the second illumination unit, the device can be made smaller and the installation space can be reduced compared to a case where a camera is provided for each illumination unit. It is also possible to reduce costs by reducing the number of parts.

In the above aspect, a container being transported may be set as the container to be inspected, and the field of view of the camera may be set so that the container can be photographed at any time when illuminated by the first illumination unit and when illuminated by the second illumination unit. In this way, even if the container moves between when illuminated by the first illumination unit and when illuminated by the second illumination unit, the container can be reliably photographed by a common camera.

The illumination position of the container by the first illumination unit and the illumination position of the container by the second illumination unit are set to be offset from each other in the transport direction of the container, the field of view of the camera is set to be able to capture the container whether the container is at the illumination position of the first illumination unit or the illumination position of the second illumination unit, and the control means may cause the first illumination unit to emit light when the container reaches the illumination position of the first illumination unit, and cause the second illumination unit to emit light when the container reaches the illumination position of the second illumination unit. According to this, by disposing the first illumination unit and the second illumination unit offset from each other in the transport direction, the container being transported can be appropriately illuminated by each illumination unit, while the camera can reliably capture images of the container illuminated by those illumination units.

The processing means includes a first processing unit (31) that processes a first image of the container illuminated by the first illumination unit, and a second processing unit (32) that processes a second image of the container acquired by the imaging unit in response to illumination by the second illumination unit. Between the imaging unit and the processing means, a switching unit (50) is provided that selectively outputs the image acquired by the imaging unit to the first processing unit or the second processing unit. The control unit may control the switching unit so that the first image is output to the first processing unit and the second image is output to the second processing unit. According to this, by processing the image based on the illumination light of the first illumination unit and the image based on the illumination light of the second illumination unit in different processing units, the risk of the time required for inspection being extended due to the time constraints required for image processing can be reduced. Therefore, it is possible to increase adaptability to increasing the container conveying speed.

The camera may be arranged to photograph the container from the bottom side, the first illumination unit may be arranged to illuminate the bottom of the container from the side, and the second illumination unit may be arranged to illuminate the container from above. This makes it possible to reliably detect foreign objects that have sunk near the bottom of the container.

1 Foreign body inspection device 2 Container 10 Illumination device (illumination means)
11 First illuminator (first illumination unit)
12 Second illuminator (second illumination unit)
20 Camera (imaging means)
30, 30A Image processing device (processing means, control means)
31 First processing unit 32 Second processing unit 40 Inspection control device (control means)
50 Image switcher (switching means)

Claims (5)

A foreign body inspection device comprising: an illumination means for illuminating a container filled with a liquid; an imaging means for photographing the container to obtain an electronic image of the container; a processing means for inspecting the container for the presence or absence of a foreign body based on the image obtained by the imaging means; and a control means for controlling the illumination means and the imaging means so as to obtain an image of the container illuminated by the illumination means,
the illumination means includes a first illumination unit provided so that reflected light from the foreign object in the container is incident on the imaging means, and a second illumination unit provided so that transmitted light through the container is incident on the imaging means,
The imaging means includes a camera that is shared for photographing the container illuminated by the first illumination unit and the container illuminated by the second illumination unit,
The camera is provided to photograph the container from a bottom side,
the first illumination unit is arranged to illuminate a bottom of the container from a side, and the second illumination unit is arranged to illuminate the container from above,
The control means controls each lighting unit so that the same container is alternately illuminated by the first lighting unit and the second lighting unit, and controls the camera so that a container illuminated by the first lighting unit and a container illuminated by the second lighting unit are photographed sequentially. The container being transported is set as the container to be inspected,
2. The foreign body inspection device according to claim 1, wherein the field of view of the camera is set so that the container can be photographed both when illuminated by the first illumination unit and when illuminated by the second illumination unit. an illumination position of the container by the first illumination unit and an illumination position of the container by the second illumination unit are set to be shifted from each other in a transport direction of the container;
The field of view of the camera is set so that the container can be photographed regardless of whether the container is in the illumination position of the first illumination unit or the illumination position of the second illumination unit;
3. The foreign body inspection device according to claim 2, wherein the control means causes the first illumination unit to emit light when the container reaches an illumination position of the first illumination unit, and causes the second illumination unit to emit light when the container reaches an illumination position of the second illumination unit. The processing means includes a first processing unit that processes a first image of the container illuminated by the first illumination unit, and a second processing unit that processes a second image of the container acquired by the imaging means in response to illumination by the second illumination unit,
A switching means is provided between the imaging means and the processing means, and the switching means selectively outputs the image acquired by the imaging means to the first processing unit or the second processing unit,
4. The foreign body inspection device according to claim 1, wherein the control means controls the switching means so that the first image is output to the first processing unit and the second image is output to the second processing unit. 1. A foreign body inspection method comprising: illuminating a container filled with a liquid with an illumination means; photographing the illuminated container with an imaging means to obtain an electronic image of the container; and inspecting the container for the presence or absence of a foreign body based on the obtained image,
The illumination means is provided with a first illumination unit that is provided so that reflected light from the foreign object in the container is incident on the imaging means, and a second illumination unit that is provided so that transmitted light through the container is incident on the imaging means,
The imaging means is provided with a camera that is used for photographing the container illuminated by the first illumination unit and the container illuminated by the second illumination unit,
The camera is provided to photograph the container from a bottom side,
the first illumination unit is provided to illuminate a bottom of the container from a side, and the second illumination unit is provided to illuminate the container from above,
A foreign body inspection method comprising: controlling each lighting unit so that the same container is alternately illuminated by the first lighting unit and the second lighting unit; and controlling the camera so that the container illuminated by the first lighting unit and the container illuminated by the second lighting unit are photographed sequentially.

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