JP2014224797A - Inspection method of container mouth part and inspection device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection method with which the mouth part of a container can be inspected without inspection omission.SOLUTION: An inspection method of a container mouth part includes an illuminating step of illuminating the outer peripheral side face of the mouth part 101 of a bottle 100 from obliquely above the bottle 100, and an imaging step of photographing the outer peripheral side face from the axial line AX direction of the bottle 100 through a fisheye lens 3a, where in the imaging step, reflection light of illumination light having entered the outer peripheral side face of the mouth part 101 that has been reflected on a face formed by a chip 103 generated at the mouth part 101, is photographed through the fisheye lens 3a.

Description

  The present invention relates to an inspection method for inspecting a mouth portion of a container such as a bag for filling a beverage or the like.

  As an inspection apparatus for inspecting the mouth portion of a beverage bowl, for example, an inspection apparatus (for example, see Patent Document 1) in which a plurality of illuminations are arranged to inspect the top surface and the side surface of the mouth side.

JP 2012-127730 A

  The outer peripheral surface of the mouth portion of the container is often provided with irregularities for reasons such as the attachment of a lid and the shape of the drinking mouth in consideration of ease of drinking. Since the optical path changes depending on the shape, there is a possibility that the inspection may be leaked. Therefore, a highly reliable inspection is desired.

  Then, an object of this invention is to provide the inspection method etc. which can test | inspect the opening part of a container so that it may not inspect.

  The container mouth inspection method according to the present invention includes an illumination step of illuminating the outer peripheral side surface of the mouth (101) of the container from obliquely above the container (100), and the mouth from the axis (AX) direction of the container. A container mouth inspection method comprising: an imaging step of imaging through a fisheye lens (3a), wherein in the imaging step, illumination light incident on an outer peripheral side surface of the mouth portion is generated in the mouth portion The reflected light reflected by the surface formed by (103) is imaged through the fisheye lens.

  The container mouth inspection apparatus according to the present invention includes an illuminating means (2) for illuminating an outer peripheral side surface of the mouth (101) of the container from an obliquely upper side of the container (100), and an axis (AX) of the container. ) Imaging means (3) for imaging from the direction of the fisheye lens (3a), and the illumination means and the imaging means cause illumination light to enter the outer peripheral side surface of the mouth portion, and are generated in the mouth portion. The reflection light reflected by the surface formed by the defect (103) is installed so as to enter the fisheye lens.

  According to the present invention, since the mouth of the container is imaged via the fisheye lens, the mouth is spread and imaged. Since defects in the mouth are easily imaged, inspection can be performed so that there is no leakage.

  In one form of the inspection method of the present invention, in the illumination step, an illuminator (2) arranged in a ring shape centering on the axial direction and disposed above the fisheye lens emits the illumination light. Also good. According to this, since illumination light is irradiated from the diagonally upper side of the container toward the outer peripheral side surface of the mouth portion, it is possible to take an image without overlooking a defect generated in the mouth portion.

  In one form of the inspection method of the present invention, in the illumination step, illumination light may be incident on the stepped portion (102) provided on the outer peripheral side surface of the mouth portion. According to this, it can test | inspect, without overlooking the defect which arose in the level | step-difference part of an opening | mouth part. In this embodiment, the stepped portion may be a step (102a) located at a lower portion of a convex portion provided at the tip of the mouth and protruding in the radial direction of the container. In this embodiment, an area in which the step portion is imaged in the image captured in the imaging step is set as an inspection region (111), and a defect in the step portion is detected based on a light / dark difference in the inspection region. A detecting step may be further provided.

  In the form in which the illuminator emits illumination light in the illumination process, the fisheye lens may be protected by the protection means (5). According to this, damage to the fisheye lens can be prevented. In this form, the protection means suppresses the incident of the reflected light reflected by the protective cover (51) disposed below the fisheye lens and the light from the illuminator on the fisheye lens. A restraining member (52) may be provided. According to this, the reflected light from the protective cover, that is, the regular reflected light and the back reflected light from the protective cover are prevented from entering the fisheye lens. Thereby, a good inspection can be performed without being affected by the reflected light of the protective cover.

  In one form of the inspection apparatus of the present invention, the illumination means may be provided with an illuminator (2) arranged in a ring shape centering on the axial direction and disposed above the fisheye lens. Further, the illumination means may cause illumination light to enter a step portion (102) provided on the outer peripheral side surface of the mouth portion. Further, the step (102a) may be a step (102a) located at a lower portion of a convex portion provided at the tip of the mouth and protruding in the radial direction of the container. Further, a defect in which an area where the stepped portion is imaged in the image captured by the imaging unit is set as an inspection region (111), and a defect in the stepped portion is detected based on a light / dark difference in the inspection region You may further provide a detection part (10).

  The form provided with the illuminator may further include a protection means (5) for protecting the fisheye lens. In this form, the protection means suppresses the incident of the reflected light reflected by the protective cover (51) disposed below the fisheye lens and the light from the illuminator on the fisheye lens. A restraining member (52) may be provided.

  In addition, in the above description, in order to make an understanding of this invention easy, the reference sign of the accompanying drawing was attached in parenthesis, but this invention is not limited to the form of illustration by it.

  According to the present invention, since the mouth of the container is imaged via the fisheye lens, the mouth is spread and imaged. Since defects in the mouth are easily imaged, inspection can be performed so that there is no leakage.

Schematic of the inspection apparatus of the container mouth part which concerns on one form of this invention. The figure explaining the mechanism which images the defect of the mouth part of a bag. The figure which shows an example of the image which imaged the mouth part of the eyelid with the inspection apparatus. The figure which shows the other example of the image which imaged the mouth part of the eyelid with the inspection apparatus. The principal part enlarged view of the inspection apparatus of the container mouth part which concerns on the modification of this invention.

  FIG. 1 is a schematic diagram of a container mouth inspection device according to an embodiment of the present invention. The inspection apparatus 1 is an apparatus that inspects the presence or absence of defects in the mouth portion 101 of the bag 100 as a container. The inspection apparatus 1 is installed on the conveyance line of the bag 100 and inspects the bag 100 being conveyed. The jar 100 is made of glass and is used for filling a liquid such as a beverage. The inspection apparatus 1 includes an illuminator 2 as an illuminating unit that illuminates the cocoon 100 and a camera 3 as an imaging unit that images the cocoon 100. The illuminator 2 is provided with a ring-shaped light source centered on the axis AX of the eyelid 100 to be inspected. As an example, the illuminator 2 has a plurality of red LEDs arranged in a ring shape.

  The camera 3 includes a fish-eye lens 3a, and converts an image of a subject captured by the fish-eye lens 3a into an electrical signal using an image sensor such as a CCD image sensor. The image signal output from the camera 3 is input to a signal processing unit 10 as a defect detection unit, and the signal processing unit 10 determines the presence or absence of a defect such as a foreign object or a flaw according to a predetermined algorithm. The signal processing unit 10 is a logical device realized by a combination of computer hardware of the control device and predetermined software. The control device includes a microprocessor, a ROM in which a program such as an operating system to be executed by the microprocessor is recorded, and an internal storage device such as a RAM that provides a work area for the microprocessor. Is a unit. The camera 3 is disposed above the cocoon 100 so that the optical axis of the fisheye lens 3 a coincides with the axis AX of the cocoon 100. The illuminator 2 is disposed above the fisheye lens 3a. Illumination light emitted from the light source of the illuminator 2 is emitted toward the mouth portion 101 from obliquely above the ridge 100.

  FIG. 2 is a diagram for explaining a mechanism for imaging a defect in the mouth portion 101 of the heel 100. A lip portion 102 as a convex portion protruding in the radial direction of the collar 100 is provided at the tip of the mouth portion 101 of the collar 100. The lip portion 102 is provided on the outer peripheral side surface of the mouth portion 101. The inspection apparatus 1 inspects for the presence or absence of a chip 103 as a defect generated in a step 102 a as a step portion located below the lip portion 102. When the chip 103 is not generated, the illumination light does not reach the fisheye lens 3 a even if the illumination light enters the lip portion 102. This is considered to be because the light is reflected on the surface of the lip portion 102 or refracted light is scattered. On the other hand, when the chip 103 is generated, the illumination light is reflected by the surface (chip surface 103a) on which the chip 103 is generated, and the reflected light enters the fisheye lens 3a. This is presumably because the illumination light incident on the ridge 100 is internally reflected (back surface reflection) on the back surface (chip surface 103a) side of the chip 103.

  Next, the operation of the inspection apparatus 1 will be described. The illuminator 2 illuminates obliquely from above the bag 100 conveyed by the conveyance line, and the camera 3 captures an image at an appropriate timing. The illumination light of the illuminator 2 may be emitted according to the imaging timing. Since the image is picked up by the fisheye lens 3a, the mouth portion 101 is spread and picked up around the axis AX. The chip 103 generated in the vicinity of the step 102a was difficult to find with the conventional inspection apparatus, but the chip 103 can be easily imaged by using the fisheye lens 3a for the inspection of the mouth portion 101. The captured image is subjected to image processing suitable for detecting a defect, and the presence or absence of a defect is determined. Since the inspection apparatus 1 is provided with members necessary for inspection above and below the eyelid 100 to be inspected, there are few restrictions when installed on the transport line. In addition, since the entire circumference of the heel 100 can be imaged, it is not necessary to provide a rotation mechanism for rotating the heel 100, and inspection can be realized with a simple configuration.

  3 and 4 show images 110a and 110b obtained by imaging the mouth 101 of the heel 100 with the inspection apparatus 1 (represented by reference numeral 110 unless otherwise distinguished). An image 110a in FIG. 3 is captured with the surface of the heel 100 dry, and an image 110b in FIG. 4 is captured with the surface of the heel 100 wet. Note that the images in FIGS. 3 and 4 are both images of the same bag 100. In both the images 110a and 110b, the chipped portion 103 generated in the mouth portion 101 is captured well. In order to distinguish between the ring imaged in accordance with the shape of the heel 100 and the image of the chipped portion 103, the signal processing unit 10 sets the region where the step 102 a is captured in the image 110 as the inspection region 111, and It may be determined whether or not there is. For example, the signal processing unit 10 sets the inspection region 111 by performing masking processing on a region other than the region where the step 102 a is captured in the image 110. Then, the signal processing unit 10 detects the presence / absence of the defect 103 based on the brightness difference of the inspection region 111. As the brightness difference, an index that can distinguish defects such as brightness, saturation, and luminance may be used.

  The present invention is not limited to the above-described form and can be implemented in various forms. For example, in the present embodiment, the defect 103 is described as a defect, but the present invention is not limited to this. For example, defects such as cracks and bubbles called chatter can be inspected by the same method. Although the example in which the chip 103 is generated in the step 102a of the lip portion 102 has been described, any defect generated in the mouth portion 101 can be inspected by the inspection apparatus 1 of the present invention. By taking an image through the fisheye lens 3a, the entire mouth part 101 is imaged in an enlarged manner. Therefore, the defect is easily imaged.

  Moreover, although it demonstrated with the ring-shaped illumination device 2 provided above the fisheye lens 3a, it is not restricted to this structure. It is only necessary to irradiate illumination light from above obliquely to the mouth portion 101 of the heel 100, and through a mirror to an appropriate position that does not interfere with conveyance (for example, laterally or below the heel 100). The illuminator 2 may be installed. Although the container 100 is described as a container, the inspection object is not limited to the glass container. For example, a transparent container such as a PET bottle may be used. If the container is made of a material that allows illumination light to pass through, the inspection using the inspection apparatus 1 is possible.

  In the embodiment described above, the inspection apparatus 1 may be provided with a protective case 5 as a protective means for protecting the fisheye lens 3a. FIG. 5 is an enlarged view of a main part of a container mouth inspection apparatus 1A according to a modification. The inspection apparatus 1A includes an illuminator 2, a camera 3, and a protective case 5. In the inspection apparatus 1A, the configuration excluding the protective case 5 is the same as the configuration described above, and thus the same reference numerals are given and description thereof is omitted.

  In the inspection apparatus 1 described above, the fisheye lens 3 a provided in the camera 3 projects downward from the illuminator 2, and reflects light reflected by the chip 103 formed on the outer peripheral side surface of the mouth portion 101 of the heel 100. It is arranged at a position in the vicinity of the ridge 100 so that it can be observed from the inner peripheral side surface. For this reason, there is a risk of contact with the bag 100 being conveyed. Therefore, in the inspection apparatus 1A, by providing the protective case 5, the fisheye lens 3a can be protected from contact with the coral 100.

  The protective case 5 includes a protective cover 51 disposed below the fisheye lens 3a, a suppressing member 52 that suppresses the reflected light reflected by the protective cover 51 from the light from the illuminator 2 and entering the fisheye lens 3a, and a protective member. A support member 53 that supports the cover 51 and a heater 54 that prevents fogging of the protective cover 51 are provided. In this modification, the illuminator 2 and the camera 3 are fixed in the protective case 5. That is, the illuminator 2, the camera 3, and the protective case 5 are integrally configured.

  The protective cover 51 is a plate-like member formed of a transparent resin, and is supported by the support member 53 below the fisheye lens 3a. The suppression member 52 is a cylindrical member that is supported by the upper surface 51 a of the protective cover 51 and that is open at both ends. The suppressing member 52 is disposed so as to cover the periphery of the fisheye lens 3a. The suppression member 52 is formed of a material that reflects or absorbs the wavelength range of light from the light source of the illuminator 2. Thereby, the reflected light by the protective cover 51 of the light from the illuminator 2 can be blocked, and the reflected light can be prevented from entering the fisheye lens 3a. The support member 53 is provided so as to surround the illuminator 2 and the camera 3, and supports the protective cover 51 at the lower end thereof. A heater 54 is provided inside the support member 53 to prevent the protective cover 51 from being fogged. The heater 54 may use a well-known technique.

  The operation of the inspection apparatus 1A will be described. The inspection apparatus 1A operates in the same manner as the inspection apparatus 1 described above. By providing the protective case 5, the contact between the fish 100 conveyed on the conveyance line and the fisheye lens 3a is prevented, and the fisheye lens 3a can be protected. Further, the camera 3 of the inspection apparatus 1 </ b> A images the mouth portion 101 of the bag 100 through the protective cover 51. Since the suppression member 52 blocks the reflected light from the protective cover 51, the image captured by the camera 3 of the inspection apparatus 1A does not have a problem due to the reflected light from the protective cover 51, and can be inspected satisfactorily. Since the illuminator 2 illuminates from above the fisheye lens 3 a, the light from the illuminator 2 is incident on the cage 100, but the presence of the protective cover 51 makes it possible to reflect regularly reflected light reflected by the upper surface 51 a of the protective cover 51. The back surface reflected light reflected by the lower surface 51b of the protective cover 51 is generated (see FIG. 5). In this modification, the suppressing member 52 suppresses such reflected light (disturbance light) including regular reflection light and back surface reflection light. Further, the illuminator 2 and the camera 3 are arranged in a protective case 5. Even if the cleaning water adhering to the scissors 100 after the cleaning is scattered by spinning or the like in the inspection rotor, the scattered water can be prevented from adhering to the illuminator 2 or the camera 3.

  In the above-described modification, the protective cover 51 is described as being formed of resin. However, even if the protective cover 51 is formed of a material that transmits the wavelength range of light from the light source of the illuminator 2 within a range that does not hinder inspection, for example, glass. Good. Moreover, although the protective cover 51 was demonstrated as transparent, you may color so that the wavelength range of the light from the light source of the illuminator 2 may permeate | transmit in the range which does not have trouble in a test | inspection. Further, the protective cover 51 is described as being formed of a plate-like member, but is not limited thereto. For example, instead of the protective cover 51, a net-like member may be used to separate the camera 3 and the bag 100 from each other. It is only necessary to adjust the size of the mesh with respect to the net-like member or to provide an opening just below the camera 3 so that the image to be captured does not have an influence of the mesh. An appropriate configuration may be applied as long as it can avoid contact with the heel 100. Further, the protective cover 51 described above may be provided with one or more holes. The protective case 5 can be reduced in weight. Further, the air permeability inside the protective case 5 becomes good, and the occurrence of fogging can be prevented. The hole of the protective cover 51 may be provided at a position that does not affect imaging.

  In the above-described modification, the suppression member 52 has been described as being formed of a material that reflects or absorbs the wavelength range of light from the light source of the illuminator 2, but the light source of the illuminator 2 does not have to be completely shielded from light. May be formed of a material that attenuates the wavelength range of light from the light to a range that does not hinder inspection. Moreover, the suppression member 52 should just be comprised so that the light may be interrupted | blocked according to the kind of light used for the illuminator 2. FIG. The configuration may be such that the visible light is blocked, or the captured image is not affected by the reflected light, and the wavelength range of the reflected light may be blocked. Moreover, although the suppressing member 52 was demonstrated as a cylindrical member, another shape, for example, a cone shape, may be sufficient. Further, the suppressing member 52 may have a shape that expands downward, a shape that narrows, or an appropriate shape. In addition, although it has been described that the suppressing member 52 is supported by the upper surface 51 a of the protective cover 51, the suppressing member 52 may be supported by a member other than the protective cover 51, for example, the camera 3. Moreover, although the suppression member 52 demonstrated as having been arrange | positioned so that the circumference | surroundings of the fisheye lens 3a may be covered, it is not restricted to this. For example, the suppressing member 52 may be disposed below the fisheye lens 3a.

  In the above-described modification, the illuminator 2 and the camera 3 are described as being fixed to the protective case 5, but between the illuminator 2 and the protective case 5 and between the camera 3 and the protective case 5. You may comprise so that a buffer member may be provided in each. According to this configuration, even if the shark 100 comes into contact with the protective cover 51, the impact when it comes into contact can be alleviated, and damage to the illuminator 2 and the camera 3 as well as the fisheye lens 3a can be prevented. Moreover, you may comprise so that the illuminator 2 and the camera 3 may not be fixed to the protective case 5. FIG. For example, the support member 53 may support the protective cover 51 outside the illuminator 2 and the camera 3 and may be configured as a separate member so as not to be connected to the illuminator 2 and the camera 3. According to this configuration, since the support member 53 and the protective cover 51 are not physically connected to the camera 3, even if the heel 100 contacts the protective cover 51, the impact when it comes into contact with the camera 3 main body. It is not transmitted, and not only the fisheye lens 3a but also the camera 3 main body can be prevented from being damaged.

1, 1A Inspection device 2 Illuminator (illumination means)
3 Camera (imaging means)
Protective case (protection means)
10 Signal processor (defect detector)
51 Protective cover 52 Suppressing member 100 壜 (container)
101 mouth portion 102 lip portion 102a step 103 chipping (defect)
AX axis

Claims (14)

An illumination process for illuminating the outer peripheral side surface of the mouth of the container from above the container;
An imaging step of imaging the mouth part from the axial direction of the container through a fisheye lens, and a container mouth inspection method comprising:
In the imaging step, an inspection method in which reflected light reflected by a surface formed by a defect generated in the mouth portion of the illumination light incident on the outer peripheral side surface of the mouth portion is imaged through the fisheye lens.   The inspection method according to claim 1, wherein in the illumination step, an illuminator arranged in a ring shape centering on the axial direction and disposed above the fisheye lens emits the illumination light.   The inspection method according to claim 1 or 2, wherein in the illumination step, illumination light is incident on a step portion provided on an outer peripheral side surface of the mouth portion.   The inspection method according to claim 3, wherein the step portion is a step provided at a lower portion of a convex portion provided at a tip portion of the mouth portion and protruding in a radial direction of the container.   The method further includes a detection step of setting a region where the step portion is imaged in the image captured in the imaging step as an inspection region, and detecting a defect of the step portion based on a light / dark difference in the inspection region. The inspection method according to claim 3 or 4.   The inspection method according to claim 2, wherein the fisheye lens is protected by a protection means.   The protective means is provided with a protective cover disposed below the fisheye lens, and a suppressing member that suppresses the reflected light reflected from the protective cover by the light from the illuminator entering the fisheye lens. The inspection method according to claim 6. Illuminating means for illuminating the outer peripheral side surface of the mouth of the container from above the container;
Imaging means for imaging the mouth from the axial direction of the container via a fisheye lens;
With
The illumination means and the imaging means are installed so that illumination light is incident on an outer peripheral side surface of the mouth portion, and reflected light that is reflected by a surface formed by a defect generated in the mouth portion is incident on the fisheye lens. Inspection device for container mouth.   The inspection apparatus according to claim 8, wherein the illuminating unit is provided with an illuminator arranged in a ring shape centering on the axial direction and disposed above the fisheye lens.   The inspection apparatus according to claim 8 or 9, wherein the illumination unit causes illumination light to enter a stepped portion provided on an outer peripheral side surface of the mouth portion.   The inspection apparatus according to claim 10, wherein the step portion is a step provided at a lower portion of a convex portion provided at a tip portion of the mouth portion and protruding in a radial direction of the container.   The image processing apparatus further includes a defect detection unit that sets, as an inspection region, an area in which the stepped portion is imaged in an image captured by the imaging unit, and detects a defect in the stepped portion based on a light / dark difference in the inspection region. The inspection apparatus according to claim 10 or 11. The inspection apparatus according to claim 9, further comprising protection means for protecting the fisheye lens.   The protective means is provided with a protective cover disposed below the fisheye lens, and a suppressing member that suppresses the reflected light reflected from the protective cover by the light from the illuminator entering the fisheye lens. The inspection apparatus according to claim 13.