JP2939145B2 - Foreign matter inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foreign matter inspection apparatus for inspecting whether or not foreign matter is present in a filling liquid in a container, and more particularly to a foreign matter inspection apparatus having a function of detecting an abnormality of the foreign matter inspection apparatus itself. The present invention relates to a foreign matter inspection device.

[0002]

2. Description of the Related Art Conventionally, there has been known a foreign substance inspection apparatus which is configured to inspect whether or not a foreign substance is present in a filling liquid in a container and to detect whether or not there is any abnormality in the foreign substance inspection function itself. (For example, see Japanese Patent Application Laid-Open No. 4-657).
No. 75).

[0003]

Incidentally, the above-mentioned conventional apparatus is provided with a sensor separately from a light source or the like in order to detect the quality of the inspection function of the foreign substance inspection apparatus itself. Then, when actually inspecting the inspection function of the foreign substance inspection apparatus itself, a sample container is supplied to the inspection area, and the sample container is inspected as to whether there is a foreign substance in the filling liquid as usual. At the same time, the sensor checks whether the light amount of the light source is abnormal.
Therefore, such a conventional apparatus has a drawback that when the detection capability of the sensor is reduced, it is impossible to determine whether the sensor is abnormal, such as a light source, or the sensor itself.

[0004]

[Means for Solving the Problems] In view of such circumstances,
The present invention provides a light source for irradiating light toward a container filled with a filling liquid, a camera for photographing the container when the light source irradiates the container with light, and a predetermined first reference value serving as a reference in advance. Is stored, and the first reference value is compared with the amount of reflected light from the filling liquid in the container photographed by the camera. If the amount of reflected light is larger than the first reference value, A foreign matter inspection device having a determination means for determining that foreign matter that reflects light is present in the filling liquid, wherein the light source, the camera, and the determination means are determined based on a predetermined second reference value having a light amount larger than the first reference value. Is provided with an offset value setting device that sets a difference obtained by subtracting a normal light amount obtained by photographing the light with a camera as an offset value when light is emitted from the light source in a state where the container operates normally and the container is not present. With a container When irradiated with light from the light source in the absence, the offset value set by the offset value setting unit, only <br/> set an adder circuit for adding the amount of light the camera is taken, the offset value by the adding circuit Of light after addition of
The value is compared with the first reference value and the determination means determines that there is a foreign substance.
If the light source, the camera and the judgment means are correct,
While the determination means determines that there is no foreign matter.
If specified, any of the above light sources, cameras and judgment means
Foreign matter detection with a self-inspection function to judge that
An inspection device is provided. Further, the present invention provides a light source for irradiating light toward a container filled with a filling liquid, a camera for photographing the container when the light source irradiates the container with light, and a first predetermined reference which is a reference in advance. A reference value is stored, and the first reference value is compared with the amount of transmitted light transmitted through the container captured by the camera. If the amount of transmitted light is equal to or less than the first reference value, the filling liquid in the container is In a foreign matter inspection device including a determination unit that determines that there is a foreign material that absorbs light, the light source, the camera, and the determination unit operate normally,
When light is emitted from the light source in a state where the container is not present, the light amount is smaller than the first reference value by a predetermined amount from a normal light amount obtained by photographing the light by a camera.
An offset value setting device for setting a difference obtained by subtracting a reference value as an offset value is provided, and when light is emitted from the light source in a state where no container is present, the offset value set by the offset value setting device is set to the camera value. There only set a subtraction circuit for subtracting from the amount of light captured, in the subtraction circuit
The light amount value after the offset value is subtracted from the first reference value
If the determination means determines that there is a foreign substance,
The light source, the camera, and the determination unit determine that the operation is normal.
On the other hand, if the determination means determines that there is no foreign matter, the light
Source, camera, or judgment means are abnormal.
A foreign object inspection device with a self-inspection function
It is.

[0005]

According to the first aspect of the invention, when inspecting whether there is any abnormality in the light source, the camera and the determination means, the light source may irradiate the light without the container. Then, the light emitted from the light source is photographed by the camera, and a predetermined offset value is added to the light amount of the photographed light by the adding circuit. As a result, when the determining means determines that there is a foreign substance, it can be determined that the functions of the light source, the camera, and the determining means are normal.
Conversely, when the determination means determines that there is no foreign matter,
It can be determined that there is an abnormality in any of the light source, the camera, and the determination unit. According to the second aspect, when inspecting whether there is any abnormality in the functions of the light source, the camera, and the judging means, light may be emitted from the light source in a state where there is no container. Then, the light emitted from the light source is photographed by the camera, and a predetermined offset value is subtracted from the light amount of the photographed light by the subtraction circuit. As a result, when the determination means determines that there is a foreign substance, the light source,
The camera and the determination means can determine that they are functioning normally. Conversely, when the determining means determines that there is no foreign matter, it can be determined that there is an abnormality in any of the light source, the camera, and the determining means. Therefore,
It is not necessary to use a sample container when detecting an abnormality in the inspection function of the foreign substance inspection apparatus itself, and it is possible to reliably detect the abnormality of the foreign substance inspection apparatus itself without adding a special sensor.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. In FIG. 1, reference numeral 1 denotes a foreign matter inspection apparatus which determines whether or not foreign matter such as glass fragments is mixed in a filling liquid filled in a container 2. It has an inspection function. The container 2 is filled with a filling liquid by a filling device on the right side (not shown), and a cap 3 is attached to a mouth thereof (see FIG. 3).
When being conveyed to the position of the rotating body 5 by the supply conveyor 4, it is sequentially carried into each mounting table 7 provided on the rotating body 5 via the supply star wheel 6. Each of the mounting tables 7 is rotatably disposed at equal intervals in the circumferential direction of the rotating body 5 and is made of a transparent material through which light can pass. Then, the container 2 supplied onto each mounting table 7 is conveyed with the clockwise rotation of the rotating body 5, and the mounting table 7 itself is rotated in the normal and reverse directions by a rotation mechanism (not shown). Accompanying each mounting table 7
Rotated with. The configuration of each mounting table 7 and
The configuration of the rotation mechanism for rotating each mounting table 7 in the forward and reverse directions is known in, for example, Japanese Patent Application Laid-Open No. 3-96841, and will not be described in detail. The container 2 on each mounting table 7 passes through the inspection area A in a state where it is rotated together with each mounting table 7, and while passing through the inspection area A, the first imaging unit 11 and the second imaging unit 12 A total of two shots are taken. The first photographing means 11 and the second
The image of the container 2 taken by the photographing means 12 is input to the control device 13, and the control device 13 uses the image of the container 2 by the first photographing means 11 and the second photographing means 12 based on the image. It is determined whether or not foreign matter is mixed in the filling liquid in the container 2. Each container 2 that has passed the inspection area A is discharged from the mounting table 7 via a discharge star wheel 14, and the control device 13 determines whether or not there is a defect determined that foreign matter is present in the filling liquid. The container 2 is firstly moved by the reject wheel 15.
It is discharged onto a discharge conveyor 16. On the other hand, the good container 2 determined by the control device 13 as having no foreign matter in the filling liquid is discharged onto the second discharge conveyor 18 via the reject wheel 15 and the transfer wheel 17. As shown in FIG. 2, an arc-shaped first light source 21 is disposed below the movement locus of each mounting table 7 in the inspection area A.
Light is continuously emitted from the lower side toward the container 2 on each mounting table 7 passing through. And this first
The first C provided in both photographing means 11 and 12 with the container 2 irradiated with light from the light source 21 and the reflected light reflected from the container 2
Photographs are sequentially taken by the CD cameras 22, 22 '. Since the container 2 on the mounting table 7 continuously moves in the inspection area A with the rotation of the rotating body 5, the container 2 is rotated adjacent to the first CCD cameras 22 and 22 ′ in accordance with the movement of the container 2. The conventional known galvanometer mirrors 23 and 23 'are provided. Thereby, each container 2 moving in the inspection area A
Can be continuously photographed by the first CCD cameras 22, 22 '. Further, strobes 24 and 24 'as second light sources are provided at two locations on the mounting table 7 moving in the inspection area A on the inner side of the container 2 respectively. These strobes 24, 24 '
The strobes 24, 24 'are provided for the second CCD cameras 25, 25' included in the first and second strobes 12. When the strobes 24, 24 'emit light, the second CCD cameras 25, 25' transmit the light through the container 2 and the container 2. I try to shoot light. As can be understood from FIG. 3, in this embodiment,
Each of the photographing means 11 and 12 includes first CCD cameras 22 and 22 'at an upper position, and second CCD cameras 25 and 25' at a lower position. As described above, in the present embodiment, two types of light sources, the first light source 21 and the strobe light 24 (24 ′), are provided in the inspection area A, and the first light source 21 and the strobe light 24 (24 ′) are provided.
Based on the images of the CCD cameras 22 and 22 ', the presence of foreign matter that reflects light, such as glass fragments, is inspected,
The presence of foreign matter that absorbs light, such as black dust, can also be inspected based on the images of the CD cameras 25, 25 '. That is, as shown in FIG. 4, in the present embodiment, a signal generating circuit 13a as a shutter means is provided in the control device 13 as the determining means, and the light emission timing of the strobes 24 and 24 'as the second light source is adjusted. A timing command circuit 13b for controlling is provided. And FIG.
As shown in (1), the signal generating circuit 13a outputs a command signal to the first CCD camera 22 to interrupt the photographing of the container 2 at each moment when the synchronization signal S1 of the image captured by the first CCD camera 22 is input. Like that. Accordingly, when a command signal is transmitted from the signal generation circuit 13a to the first CCD camera 22 even though light is continuously emitted from the first light source 21 toward the container 2, the first signal is transmitted.
The input of the image of the container 2 from the CCD camera 22 to the control device 13 is blocked. That is, each time the synchronization signal S1 is input, an optical dark portion is generated in the first CCD camera 22. In the present embodiment, the synchronization signal S1 is
3 is set, for example, about every 16.7 msec, and the time t1 (time during which the video is interrupted) based on which the optical dark portion of the first CCD camera 22 occurs is about 7 msec. . Thus, the first CCD
While the image by the camera 22 is interrupted, the light emission command signal S2 is transmitted from the timing command circuit 13b to the strobe 24. At this time, since the light emission time of the strobe is, for example, 30 μsec, it is possible to irradiate light from the strobe toward the container 2 within the time t1 (7 msec) at which the dark portion occurs. Thus, despite the provision of two types of light sources, the first light source 21 and the strobe 24 (24 ') as the second light source, in the same inspection area A, the light from the strobe 24 (24') having a large light amount is obtained. The light does not adversely affect the image of the container 2 and the reflected light captured by the first CCD camera 22 (22 '). Therefore, the first CCD camera 22 (22 ') and the second
The image taken by the CCD camera 25 (25 ')
The control device 13 is an accurate image that is not affected by mutual interference of light.
The control device 13 not only uses the images but also reflects foreign matter such as a glass piece that reflects light,
It is possible to determine whether or not foreign matter such as black dust that absorbs light is mixed in the filling liquid. That is, first, when the image of the container 2 and the image of the reflected light reflected from the filling liquid taken by the first CCD camera 22 of the first photographing means 11 are input to the control device 13, the images are subjected to A / D conversion. The signal is converted into a digital signal by the device 13c. Next, this digital signal is converted to a binarization circuit 13d.
Is binarized into white and black. The image of the first CCD camera 22 that has been binarized into white and black is compared with a predetermined white reference value X1 stored in the first white detection circuit 13e by the first white detection circuit 13e. Is done. Here, if there is a foreign substance such as a glass piece 28 that reflects light in the filling liquid, the first CCD camera 22
Is taken as reflected light, and this glass piece 28
When the image data is binarized by the binarization circuit 13d, the image becomes white. Therefore, the white value transmitted from the binarization circuit 13d to the first white detection circuit 13e increases. The first white detection circuit 13e compares the white value transmitted from the binarization circuit 13d with the reference value X1, and determines whether the transmitted white value is the reference value X1.
If it is larger than 1, it is determined that a foreign matter that reflects light, such as a glass piece 28, exists in the filling liquid. On the other hand, the white value transmitted from the binarization circuit 13d is the reference value X
If the value is equal to or less than 1, the first white detection circuit 13e determines that there is no foreign matter that reflects light, such as glass, in the filling liquid.
On the other hand, when the strobe 24 as the second light source is emitted, the image of the container 2 irradiated with the light from the strobe 24 and the image of the transmitted light transmitted through the container 2 are the first image of the first photographing means 11. When input from the 2CCD camera 25 to the control device 13, the control device 13 converts the image into the A / D converter 1
The signal is converted into a digital signal by 3f. This digital signal is transmitted to the binarization circuit 13g,
The image is binarized into white and black by g. Next, the digital signal binarized into white and black is transmitted to a second white detection circuit 13h, and a predetermined white signal stored in advance in the second white detection circuit 13h by the second white detection circuit 13h. Reference value Y1
Is compared to Here, suppose that black dirt 29 is temporarily contained in the filling liquid.
Is present as a black shadow in the transmitted light that has passed through the container 2, and is binarized by the binarization circuit 13g accordingly. The white value of the digital signal becomes smaller. Then, the second white detection circuit 13h compares the reference value Y1 with the white value transmitted from the binarization circuit 13g, and determines that the white value transmitted to the second white detection circuit 13h is smaller than the reference value Y1. If the size is small, it is determined that a foreign matter that absorbs light, such as black dust 29, is present in the filling liquid. On the contrary, as a result of comparing the white value transmitted to the second white detection circuit 13h with the reference value Y1, the white value transmitted to the second white detection circuit 13h is larger than the reference value Y1. When it is large, it is determined that there is no foreign matter that absorbs light such as black dust 29 in the filling liquid. First, the control device 13 determines whether or not a foreign object exists in the container.
This is performed based on the images input from the CCD camera 22 and the second CCD camera 25 to the control device 13, and then the first CCD camera 22 ′ and the second CCD camera 2
This is performed based on the image input from 5 ′ to the control device 13. As described above, in the present embodiment, the presence / absence of a foreign substance having the opposite property is inspected twice in the same inspection area A. In this embodiment, the first photographing means 1
Although the first and second photographing means 12 are provided, one of them may be omitted. According to the present embodiment, a foreign substance such as a glass piece 28 that reflects light and a foreign substance such as black dust 29 that absorbs light, that is, a foreign substance having completely opposite properties are inspected in the same inspection area A. Therefore, the versatility can be improved without increasing the installation space of the foreign substance inspection device 1. Further, in the present embodiment, the container 2 to be inspected is
When light is emitted from the first light source 21 and the strobe 24 (24 ') in a state where the controller 13 is not mounted on the mounting table 7,
The presence or absence of a foreign matter is determined by the first light source 21, the strobe 24 (24 '), the CC
The inspection function of the D cameras 22 (22 '), 25 (25') and the control device 13 can be inspected for any abnormality. That is, as shown in FIG.
A first offset value setting device 31 and an addition circuit 32 are added to a determination system of the control device 13 that determines whether or not there is a foreign object that reflects light based on the image of the first CCD camera 22. As described above, the first selector 33 actually irradiates the container 2 on the mounting table 7 with light to detect the presence or absence of foreign matter in the filling liquid, and there is no abnormality in the light source or the like. It is selectively switched to a self-function test for checking whether or not the test is performed. More specifically, the first
Assuming that the reference value X1 stored in the white detection circuit 13e is 100, the digital signal of the reflected light photographed by the first CCD camera 22 is converted into a binarization circuit at the time of the normal inspection for irradiating the container 2 on the mounting table 7 with light. If the value of white when binarized at 13d and transmitted to the first white detection circuit 13e is greater than 100, the first white detection circuit 13e detects foreign matter that reflects light in the filling liquid in the container 2. On the contrary, if the white value transmitted to the first white detection circuit 13e during the normal inspection is 100 or less, the first white detection circuit 13e determines that there is no foreign substance. I do. Therefore, in this embodiment,
A white value larger than the reference value X1 (100) is defined as a second reference value X2, which is, for example, 101. Next, the first light source 21, the strobe 24 (24 '), the first CCD
When the camera 22 (22 ') and the control device 13 operate normally and the container 2 is not present, the first light source 21,
When light is emitted from the strobe 24 (24 '), the white value transmitted from the binarization circuit 13d to the first white detection circuit 13e when the light is normally captured by the first CCD camera 22 (22') ( For example, 60) is obtained. Here, the offset value setting unit 31 sets 41 obtained by subtracting 60 from 101, which is the second white reference value X2, as an offset value. Then, the adding circuit 32 sets the first light source 21 and the first light source 21 in a state where the container 2 to be inspected is not mounted on the mounting table 7.
At the time of a self-function test in which light is emitted from the strobe 24 (24 '), the reflected light photographed by the first CCD camera 22 is converted into a digital signal by the A / D converter 13c into a signal value, and the offset value setting unit 31 is used. The digital signal corresponding to the set offset value 41 is added. As a result, the total digital signal obtained by adding the digital signal of the reflected light and the digital signal corresponding to the offset value 41 by the adding circuit 32 is converted to the binarizing circuit 13d.
Is transmitted to the binarization circuit 13
After being binarized into white and black by d, it is transmitted to the first white detection circuit 13e. Then, the value of white transmitted to the first white detection circuit 13e is the second reference value X2 101
When it becomes, the first white detection circuit 13 e
By comparing the white value of 1 with the initial reference value X1 (100),
Since 101 is larger than the initial reference value X1 (100), it is determined that a foreign substance exists. In other words, in this case, the first light source 21, the strobe 24 (24 '), the first
It can be determined that the CCD camera 22 (22 ') and the control device 13 are operating normally. Conversely, the addition circuit 32 adds the digital signal value corresponding to the offset value 41 to the digital signal value of the reflected light, and the white value transmitted to the first white detection circuit 13e becomes the initial reference value X1. When the value becomes 99 smaller than (100), the first white detection circuit 13e determines that there is no foreign substance. This means that the first light source 21 and the strobe 24
(24 '), first CCD camera 22 (22'), A / D
It can be determined that any of the functions of the converter 13c, the binarization circuit 13d, and the first white detection circuit 13e is abnormal. In this manner, the self-inspection function of the system for inspecting the presence or absence of a foreign object that reflects light based on the image of the first CCD camera 22 is performed. On the other hand, a second offset value setting device 34 and a subtraction circuit 35 are added to the determination system of the control device 13 which determines the presence or absence of a black foreign substance by detecting transmitted light with the second CCD camera 25. Then, the second selector 36 irradiates the container 2 actually mounted on the mounting table 7 with light to detect the presence or absence of a foreign substance in the filling liquid by irradiating the container 2 with light. It is selectively switched to a self-function test for checking whether or not the test is performed. More specifically, the white reference value Y stored in the second white detection circuit 13h
Assuming that 1 is 100, the image captured by the second CCD camera 25 is binarized by the binarization circuit 13g at the time of the normal inspection in which light is irradiated toward the container 2, and then the binarization circuit 13g outputs the second image from the binarization circuit 13g.
When the white value transmitted to the white detection circuit 13h is 100 or more, the second white detection circuit 13h determines that there is no foreign matter such as black dust absorbing light in the filling liquid in the container 2. Conversely, when the value of white transmitted from the binarization circuit 13g to the second white detection circuit 13h is smaller than 100, the second white detection circuit 13h absorbs light such as black dust or other foreign matter. Is determined to exist. Therefore, in the present embodiment, the reference value Y1 (10
The second reference value Y2 for white smaller than 0) is set to 99. Next, the first light source 21 and the strobe light 24 (2
4 ′), when the second CCD camera 25 (25 ′) and the control device 13 operate normally and the first light source 21 and the strobe 24 (24 ′) emit light in a state where the container 2 is not present, When the light is normally photographed by the second CCD camera 25, the second white detection circuit 1
The value of white (for example, 200) transmitted to 3h is obtained. Then, the second offset value setting unit 34 sets 101 as the offset value, which is obtained by subtracting 99, which is the second white reference value Y2, from the white value 200 in the normal state without the container 2. Then, the subtraction circuit 35 sets the first light source 2 in a state where the container 2 to be inspected is not mounted on the mounting table 7.
1. At the time of a self-function test in which light is emitted from the strobe 24 (24 '), the second offset value setting unit 34 converts the light captured by the second CCD camera 25 from the digital signal converted by the A / D converter 13f. A digital signal corresponding to the set offset value 101 is subtracted. Then, the digital signal after the subtraction by the subtraction circuit 35 is transmitted to the binarization circuit 13g and binarized.
The signal is transmitted to the white detection circuit 13h. When the white value transmitted to the second white detection circuit 13h becomes smaller than 100, which is the initial reference value Y1, in this manner,
The second white detection circuit 13h determines that a foreign substance exists. In other words, in this case, it can be determined that the first light source 21, the strobe 24 (24 '), the second CCD camera 25 (25'), and the control device 13 are operating normally. Conversely, after the subtraction circuit 35 subtracts the digital signal corresponding to the offset value from the optical digital signal, the white value transmitted to the first white detection circuit 13e is the initial reference value Y1. If larger, the second white detection circuit 13h determines that there is no foreign substance. In other words, in this case, the first light source 21, the strobe 24, the second CCD camera 25, the A / D converter 13
f It can be determined that any of the functions of the binarization circuit 13g and the second white detection circuit 13h is abnormal. According to this embodiment, there is no need to use a sample container when detecting an abnormality in the inspection function of the foreign substance inspection device 1 itself, and without adding a sensor for detecting the abnormality. In addition, the abnormality of the foreign substance inspection device 1 itself can be reliably detected. In the above embodiment, the first C
Control is performed in two systems: a system for inspecting the presence or absence of foreign matter such as a glass piece 28 based on the image of the CD camera 22 and a system for inspecting the presence or absence of foreign matter such as black dust 29 based on the image of the second CCD camera 25. Although the inside of the device 13 is divided, as shown in FIG. 6, the inside of the control device 13 is integrated into one system, and the selector 33 uses the subtraction circuit 32 and the addition circuit 35 during the self-function test. May be selectively switched to

[0007]

As described above, according to the present invention, there is no need to use a sample container when detecting an abnormality in the inspection function of the foreign substance inspection apparatus itself, and furthermore, without particularly providing a sensor, the foreign substance inspection apparatus. This has the effect of being able to reliably detect its own abnormality.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing one embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a sectional view of a main part along line III-III in FIG. 2;

FIG. 4 shows the configuration of the control device 13 and the CCD cameras 22 and 2;
FIG.

FIG. 5 is a diagram showing the timing of signal exchange between each of the CCD cameras 22 and 25 and the control device 13.

FIG. 6 is a schematic configuration diagram showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Foreign substance inspection apparatus 2 ... Container 13 ... Control apparatus (determination means) 21 ... 1st light source 22 ... 1st CCD camera 24, 24 '... Strobe (2nd light source) 25 ... 2nd CCD camera 28 ... Glass piece (foreign substance) 29 ... Black dust (foreign matter) 31 ... First offset value setting device 32 ... Addition circuit 34 ... Second offset value setting device 35 ... Subtraction circuit

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Nobuo Watanabe 58, Kozuda Honcho, Kanazawa-shi, Ishikawa Prefecture Inside Shibuya Kogyo Co., Ltd. 72) Inventor Shuji Onaka 5-7-1 Shiba, Minato-ku, Tokyo NEC Corporation (72) Inventor Toshiyuki Ishii 5-7-1 Shiba, Minato-ku, Tokyo NEC Corporation (72) Invention Person Kazuto Kozu 1-23-1 Azumabashi, Sumida-ku, Tokyo Asahi Breweries Azumabashi Building (72) Inventor Hiroshi Henmi 1-33-9 Mukojima, Sumida-ku, Tokyo Asahi Breweries Hirahashi Building (56) References JP JP-A-4-65775 (JP, A) JP-A-3-96841 (JP, A) JP-A-57-137844 (JP, A) JP-A-6-294760 (JP, A) JP-A-62-252440 JP, A) JP flat 6-34577 (JP, A) (58 ) investigated the field (Int.Cl. ^6, DB name) G01N 21/84 - 21/91

Claims (2)

(57) [Claims] 1. A light source for irradiating light to a container filled with a filling liquid, a camera for photographing the container when the light source irradiates light to the container, and a first reference as a reference in advance.
A reference value is stored, and the first reference value is compared with the amount of reflected light from the filling liquid in the container photographed by the camera. If the amount of reflected light is larger than the first reference value, the container is stored. A foreign matter inspection device having a determination means for determining that a foreign matter that reflects light is present in the filling liquid therein, wherein the light source, the camera, and the light source are separated from a predetermined second reference value having an amount of light larger than the first reference value. The judgment means operates normally,
In addition, when light is emitted from the light source in a state where the container is not present, an offset value setting device for setting a difference obtained by subtracting a normal light amount obtained by photographing the light with a camera as an offset value is provided, and the container does not exist. When light is emitted from the light source in this state, an adder circuit is added to add the offset value set by the offset value setting device to the light amount photographed by the camera.
The light amount value after the offset value is added by this addition circuit
Is compared with the first reference value, and the determination means determines that there is a foreign substance.
If judged, the light source, camera and judgment means are normal
While the determination means determines that there is no foreign matter.
If so, one of the above light source, camera and judgment means
A foreign matter inspection device having a self-inspection function for determining that the object is abnormal . 2. A light source for irradiating light to the container filled with the filling liquid, a camera for photographing the container when light is irradiated from the light source to the container, and a first predetermined reference which is a reference in advance.
A reference value is stored, and the first reference value is compared with the amount of transmitted light transmitted through the container captured by the camera. If the amount of transmitted light is equal to or less than the first reference value, the filling liquid in the container is A foreign matter inspection device having a determining means for determining that a foreign substance that absorbs light exists therein, wherein the light source, the camera, and the determining means operate normally, and the light source irradiates the light from the light source in a state where no container exists. At this time, the light amount is smaller than the first reference value by a predetermined amount from the normal light amount obtained by photographing the light by the camera.
An offset value setting device for setting a difference obtained by subtracting a reference value as an offset value is provided, and when light is emitted from the light source in a state where no container is present, the offset value set by the offset value setting device is set to the camera value. There only <br/> set a subtraction circuit for subtracting from the amount of light captured, the quantity of light after the subtraction of the offset value by the subtraction circuit
The value is compared with the first reference value and the determination means determines that there is a foreign substance.
If the light source, the camera and the judgment means are correct,
While the determination means determines that there is no foreign matter.
If specified, any of the above light sources, cameras and judgment means
A foreign matter inspection device having a self-inspection function for determining that the abnormality is abnormal .