JP2004271205A - Defect inspection device of container mouth part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a defect inspection device of a container mouth part capable of coping easily and quickly with the case where the shape of an inspection body container is changed and detecting a defect at a stable and high detection rate. <P>SOLUTION: This device is equipped with LED groups L1-6 for floodlighting each face of the top face, the inner face and the side face of the container mouth part from different angles respectively, cameras C1-11 for collecting floodlighted portions as two-dimensional images, and an image processing part 30 for performing image analysis with respect to the acquired images. A plurality of kinds of images formed by combinations between the LED groups L1-6 and the cameras C1-11 are collected in time series by the camera C, and defect inspection of the container mouth part 50A is performed by the image processing part 30 by using the plurality of collected images. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a defect inspection device for a container mouth, and more particularly, to a defect inspection device for inspecting a defect such as a scratch or a protrusion at a mouth of a container conveyed.
[0002]
[Prior art]
When manufacturing a container, defects such as stiffness, deformation, poor output, bubbles, chips, scratches, and coloring due to scorching may occur at the mouth of the container. Conventionally, the appearance of the mouth of the container on a production line The above defect inspection has been performed.
A conventional defect inspection apparatus for a container opening is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-55827 (Patent Document 1).
FIG. 11 shows a schematic configuration diagram of a defect inspection apparatus disclosed in Patent Document 1. In the figure, a container 81 as an object to be inspected is transported on a transport line 82. The defect inspection apparatus 80 includes a light 84, and the light 84 is arranged above the mouth 81 </ b> A of the container 81 so as to project light to the mouth 81 </ b> A.
[0003]
A sensor 83 is provided on the side of the transport line 82 so as to detect whether or not the container 81 has reached the front. Then, four two-dimensional video cameras 85A to 85D are installed at 90 ° intervals in the lateral direction around the mouth 81A.
The video cameras 85A to 85D are used to photograph and collect the mouth 81A at a total angle of 360 degrees by dividing the mouth 81A into four parts by 90 degrees from the horizontal direction. The circumference is set to be photographed from four directions.
[0004]
Further, the defect inspection device 80 includes an image processing device 86. The image processing device 86 captures the detection signal of the sensor 83 and the captured images of the video cameras 85A to 85D, and distinguishes a chip or a projection at the mouth 81A from a foreign substance. It is configured to detect separately.
[0005]
The defect inspection apparatus 80 having such a configuration operates as follows. The container 81 is transported on a transport line 82, which is detected by a sensor 83, and under illumination 84, video cameras 85A to 85D collect images from the mouth 81A in four directions. The images of the video cameras 85A to 85D taken from the four directions are taken into the image processing device 86, and the container 81 in which the opening 81A has a chip or a protrusion is removed from the transport line 82 as a defective product.
[0006]
[Patent Document 1]
JP-A-2000-55827 (page 41, right column, line 41 to page 3, left column, line 15, FIG. 1)
[0007]
[Problems to be solved by the invention]
By the way, the above-mentioned Patent Document 1 has a configuration in which a peripheral image of the outer surface of the mouth portion 81A is collected by four fixed cameras. Therefore, when performing the inner surface inspection of the mouth 81A or the top surface inspection of the mouth 81A, the four fixed cameras 85A to 85D and the illumination 84 must be arranged again at the optimum positions.
Such work also occurs when the shape (mold) of the container to be inspected is changed (hereinafter, referred to as “model change”), and there is a technical problem that a great deal of time is required only for the placement work. Had.
Further, when setting the positions of the camera and the lighting, there is an individual difference between operators who make the settings, and thus the setting positions are different for each operator, resulting in a variation in the defect detection sensitivity. Therefore, there is a problem that the yield varies.
[0008]
In the case of continuously collecting and inspecting each part (side surface, top surface, and inner surface) of the mouth portion 81A while transporting the container on the conveyor transport line, a camera and lighting for image capturing of the respective portions are provided, and Must be arranged along the line, which requires a large footprint as a space for the inspection equipment.
[0009]
The present invention has been made under the circumstances described above, and can easily and quickly respond even when the shape of a container of an inspected object is changed, and detect a defect with a stable high detection rate. It is an object of the present invention to provide a defect inspection device for a container mouth which can be performed.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, a defect inspection device for a container mouth according to the present invention is a defect inspection device for inspecting a defect of a container mouth, wherein a top surface of an opening of the container to be conveyed and an inner surface A plurality of light projecting units projecting light from different angles to the respective side surfaces, a plurality of cameras sampling a part projected by the light projecting unit as a two-dimensional image; An image processing unit that performs image analysis on the image that has been obtained, a plurality of images formed by a combination of the plurality of light emitting units and the plurality of cameras, in time series by the camera, collected, It is characterized in that the image processing unit performs a defect inspection of the container mouth using the plurality of collected images.
With this configuration, two-dimensional images of the top surface, inner surface, and side surface of the container mouth are continuously collected in a time series, and the images are subjected to image analysis. Can be done comprehensively.
In addition, since the images of each part of the container mouth are photographed and collected in chronological order, the light emitted at the time of photographing each part is emitted with a time difference. Therefore, it is possible to avoid an adverse effect due to light interference.
[0011]
Here, the apparatus further comprises a substantially dome-shaped holder on which the plurality of light projecting units and the plurality of cameras are disposed, and the container opening is covered with the container opening in the holder. It is preferable that the plurality of light projecting units emit light, and the plurality of cameras collect images of the container opening.
With a dome-shaped holder as described above, the camera can be arranged at a position where all of the top surface, inner surface, and side surface of the container mouth can be collected. Can be projected.
Further, in the holder, the respective cameras and the light projecting units are disposed in substantially fixed positions, so that the setting operation when the object to be inspected is switched to a container of another shape can be facilitated. . That is, when setting the positions of the camera and the light projecting unit with respect to each part of the container mouth, only the distance between the holder and the container mouth needs to be set.
Furthermore, since the installation space for the camera and the light projecting unit can be accommodated in the installation space for the dome-shaped holding body, their footprint can be reduced.
[0012]
In addition, a predetermined number of light emitting units of the plurality of light emitting units may simultaneously emit light to the container opening. With this configuration, it is possible to simultaneously emit light to the container opening with various combinations of light emitting units. As a result, it is possible to raise scratches and the like that do not come out only by projecting light in one direction.
A predetermined number of cameras among the plurality of cameras may simultaneously capture the image of the container opening. In this way, two-dimensional images of the top surface, the inner surface, and the side surface of the container mouth can be continuously collected in time series. In addition, in order to avoid adverse effects due to light interference, the side surface of the container mouth can be sampled separately on the left side and right side.
[0013]
The image processing unit sets an inspection window for specifying an inspection range in the image for each image collected by the camera, and sets a luminance window for measuring a luminance value in the image. From the measured luminance value in the luminance window, an appropriate luminance test for determining a luminance threshold for defect determination and a shape inspection based on a luminance change for an image in the inspection window are performed, and the result of the appropriate luminance test is performed. It is desirable to determine the presence / absence of a defect in the container mouth from the shape inspection using a luminance threshold based on
As described above, the shape of the window is inspected by the inspection window, and the appropriate luminance (luminance threshold) is determined by the appropriate luminance inspection in the luminance window, so that the accuracy of the defect detection rate can be improved. . This can also prevent erroneous detection.
[0014]
Further, it is desirable that the luminance threshold value for the defect determination in the appropriate luminance test varies depending on the measured luminance value in the window, and is determined by correcting a preset luminance threshold value.
The brightness of the container opening differs for each inspection part of the container opening, and also differs depending on the light projection angle and the light projection amount of the light projecting unit with respect to the inspection part. Furthermore, it changes due to fluctuation, deterioration, etc. of the light projection of the light projecting unit.
As described above, since the appropriate value of the luminance threshold value changes, accurate defect detection can be performed by changing the luminance threshold value for defect determination according to the measured luminance value in the window.
[0015]
Further, a plurality of the substantially dome-shaped holders are provided, and the plurality of holders are integrally formed along the direction in which the container is transported, and the plurality of light emitting units and the plurality of cameras are provided on each of the holders. May be provided.
For example, when two dome-shaped holders are integrally formed along the conveyor conveyance direction, an image of the inner surface of the container opening and one side surface are provided on one holder, and the container opening is imaged on the other holder. The image of the surface and the remaining one side surface can be acquired.
With such a configuration, it is possible to cope with a high conveyor speed.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a defect inspection apparatus according to the present invention will be described based on an embodiment shown in the drawings.
FIG. 1 is a block diagram showing the overall configuration of the defect inspection apparatus. The defect inspection apparatus 100 shown in FIG. 1 detects, for example, the presence or absence of a foreign substance or a defect in a mouth (hereinafter, referred to as a vessel mouth) of a resin container. It is a device to be inspected.
The defect inspection apparatus 100 includes an image capturing unit 1 that captures an image of a container mouth and captures an image of the container mouth, and an image processing that analyzes an image captured by the image capturing unit 1 to determine whether there is a defect. It comprises a unit 30 and an operator operation unit 40 operated by an operator.
[0017]
The image collecting unit 1 captures an image of a container mouth as an object to be inspected by a substantially dome-shaped inspection head 2 having a plurality of CCD cameras, a light emitting LED, and a photosensor. And a function to collect the image data and pass it to the image processing unit 30. Note that the plurality of cameras included in the inspection head 2 are connected to the image processing unit 30 via the connection connector 3, and the LEDs and the photo sensors are connected to the image processing unit 30 via the connection connector 4.
[0018]
The image processing unit 30 includes a central processing unit 35 which is a center of the image processing unit 30. The central processing unit 35 controls all signals in the image processing unit 30, and the image collection unit 1 An image analysis process is performed on the acquired image data.
The central processing unit 35 includes an arithmetic unit (not shown), a storage unit (not shown) having a program for image analysis processing, and a storage unit (not shown) for temporarily storing data used in the program. I have at least.
[0019]
Further, the camera interface unit 31 and the sensor interface unit 32 convert the two-dimensional image of the CCD camera and the signal of the photo sensor input from the image collection unit 1 into data forms that can be processed in the central processing unit 35, respectively. It has.
Furthermore, an LED light emission control unit 33 that performs light emission control of the LED of the image collection unit 1, an encoder pulse input unit 37 that receives an encode signal of a conveyor operation from a conveyor that conveys a container that is a subject, A discharge signal output unit 36 for outputting a container discharge signal as a defect inspection result.
The central processing unit 35 controls the operations of the camera interface unit 31, the sensor interface unit 32, and the LED light emission control unit 33.
The encode signal from the conveyor input to the encoder pulse input unit 37 is used as a timing signal for synchronously controlling the operations of the CCD camera and the LED of the image collection unit 1.
[0020]
Further, the operator operation unit 40 includes a keyboard 42 as a means for inputting a signal by an operator at the start of an inspection or setting of various parameters, for example, and a monitor 41 for displaying an image or the like of the container opening. It is connected to the central processing unit 35 of the image processing unit 30.
[0021]
Next, the configuration of the image collection unit 1 will be described in detail. FIG. 2 is a plan view of the image capturing unit, and FIG. 3 is a side view thereof.
As shown in FIG. 2 and FIG. 3, columns 5 and 6 are respectively installed with a conveyor 10 serving as a conveying means of the container 50 interposed therebetween.
The container 50 is conveyed upright on the conveyor 10, and is configured so that an image of each part of the container opening 50 </ b> A is collected by the inspection head 2.
[0022]
The inspection head 2 includes a plurality of CCD cameras (hereinafter, referred to as cameras) C1 to C11 and a plurality of LED groups L1 to L6, a dome-shaped holder 11 that holds them, and a photo sensor that detects the container opening 50A. And a sensor unit S.
[0023]
As shown in FIGS. 2 and 3, the dome-shaped holder 11 has flanges 11B and 11C integrally formed on both left and right sides of a dome portion 11A which is a substantially dome-shaped housing.
The dome portion 11A has six LED groups L1 to L6, which are light projecting portions, and eleven cameras C1 to C11, each of which shoots and collects a part projected by the LED groups L1 to L6 as a two-dimensional image. And are arranged. In FIG. 2, the LEDs are shown as ellipses, and the cameras are shown as rectangles.
[0024]
The cameras C1 to C11 are provided so as to photograph the container opening 50A from a plurality of directions and collect images. The camera C1 is a camera for photographing the top surface of the container opening 50A, and is attached to the uppermost center of the dome 11A. The cameras C2 to C5 are disposed on the dome portion 11A with a predetermined inclination angle with respect to the axis of the upright container 50, so that the inner surface of the mouth portion 50A can be photographed from four directions. Further, the cameras C6 to C11 are arranged on the dome portion 11A so as to be substantially perpendicular to the axis of the container 50A so that the side surface of the container opening 50A can be photographed from six lateral directions.
[0025]
The six LED groups L1 to L6 project light to the container opening 50A from multiple directions, and are disposed on the dome 11A so as to fill the gap between the cameras C1 to C11. Further, each LED group is composed of a plurality of LED projectors.
In the defect inspection apparatus 100, any one of the plurality of cameras C and any one of the plurality of LED groups L are configured to always operate simultaneously. That is, the LED group L emits light to the container opening 50A, and the light is used to optically raise defects such as flaws, and the raised defects such as flaws are photographed by the camera C.
[0026]
Openings 11D and 11E are formed on both sides of the dome 11A (in the y-axis direction in FIG. 1), which serve as passage openings for the container opening 50A when the container 50 is transported.
A sensor section S is provided in a space defined by the openings 11D and 11E (passage path of the container opening 50A). In the sensor section S, sensors S1 and S2 for detecting the presence / absence of the container 50 are arranged side by side on the flange 11C side, and reflecting plates 14 and 15 are arranged side by side on the flange 11B side so as to face each other. I have.
That is, the light from the sensor S1 is reflected by the reflection plate 14, and the reflected light is detected by the sensor S1. Similarly, the reflection plate 15 reflects the light beam from the sensor S2, and the sensor S2 detects the reflected light. Thus, an object that blocks the light beam formed in the x-axis direction in FIGS. 2 and 3 is detected, and a detection signal is passed to the image processing unit 30.
A connector 3 for connecting the image processing unit 30 to the cameras C1 to C11 and a connector 4 for connecting the image processing unit 30 to the LED groups L1 to L6 and the sensor unit S are provided on the flange 11B. I have.
[0027]
The flanges 11B and 11C of the dome-shaped holding body 11 are provided with holes for penetrating the columns 5 and 6, respectively. The flanges are fixed by the grip 7 for height adjustment and the clamp 8 for fixing. Have been. That is, the height of the inspection head 2 can be adjusted by the height adjustment grip 7, and the distance between the inspection head 2 and the container opening 50A can be adjusted.
[0028]
Next, the operation of the defect inspection apparatus 100 will be described.
FIG. 4 shows an outline of processing by software in the central processing unit 35. First, when the power supply indicated by reference numeral A is turned on, an initialization process indicated by reference numeral B is executed, and the system operation is prepared. In this initial setting B, window positions of the cameras C1 to C11, parameters for defect determination, a luminance detection window, and the like are set. If it has already been set, its contents are set, and when the apparatus is introduced, it is set to a predetermined value.
[0029]
Next, either the online processing D or the offline processing C is selected by the operator. In addition, online refers to a state in which the container 50 is being conveyed by the conveyor 10, and offline refers to a state in which the operation of the conveyor 10 is stopped.
When the selection is the offline processing C, preparation for offline processing is performed by the processing of the initial setting of the offline indicated by reference character E, and the processing selection is awaited. The offline processing includes a window setting processing F, an online verification processing G, and a type change processing H, which are executed by selection.
In this offline initialization, each counter value such as the online state parameter (when the conveyor is operating), the number of inspections, and the defect type is stored and held in the storage unit of the central processing unit 35.
[0030]
When the operator selects the window setting process F, the operator performs the following operation. The operator arranges and sets an eight-part inspection window 61 formed in a ring shape with respect to the top surface image 60 of the container opening 50A captured by the camera C1 as shown in FIG.
As shown in FIG. 9, an inspection window 63 and a luminance window 64 are arranged and set for each of the inner surface images 62 of the container opening 50A captured by the cameras C2 to C5.
Further, as shown in FIG. 10, the inspection windows 66 to 69 and the brightness window 70 are arranged and set for each of the side images 65 of the container opening 50A captured by the cameras C6 to C11.
[0031]
In this window setting operation, the operator sets a defect determination parameter for each set inspection window, and sets a brightness variable parameter and an accumulated brightness value for each brightness window.
For the inspection window 61 of the top image 60 collected by the camera C1, the following parameters are set as defect determination parameters.
First, for each of the eight divided inspection windows 61, the accumulated value of the shade (luminance value) of each pixel is used as a shaded accumulated value comparison parameter. Further, a threshold value for binarizing the luminance of each pixel in each of the inspection windows 61 is set, the luminance of each pixel is binarized and accumulated, and this is used as a binarized accumulated value comparison parameter.
[0032]
Then, among the images 62 and 65 taken by the cameras C2 to C11, for each of the brightness windows 64 and 70, the multiplier K is set as a brightness variable parameter, and the brightness value of each pixel in the window is accumulated. Set as the cumulative brightness value at the time of setting.
The multiplication factor K and the cumulative luminance value at the time of setting are parameters used in the defect inspection processing in the online processing. Specifically, in the appropriate luminance inspection processing in the defect determination processing, the difference between the accumulated value of the luminance value of each pixel received in each of the luminance windows 64 and 70 and the accumulated luminance value at the time of setting is calculated. By multiplying by the multiplication factor K, a luminance threshold value is obtained.
[0033]
Further, for each of the inspection windows 63, 66 to 69, the accumulated value of the shade (luminance value) of each pixel in the window is set as the accumulated shade value. This shaded value is added to the luminance threshold value obtained in each luminance window in the shape inspection processing in the online processing, and is used as a defect determination parameter.
[0034]
When the off-line verification process G is selected, the operator performs the following operation. On the monitor 41, the online state parameters stored and held in the central processing unit 35 in the offline initialization, that is, information such as the position setting of the inspection head 2, the inspection and brightness windows for the cameras C1 to 11, the defect detection parameters, and the like are displayed. Is done.
Therefore, the operator verifies the information displayed on the monitor 41.
[0035]
When the container type change process H is selected, the operator performs the following operation. First, regarding the position setting such as the height position of the inspection head 2, the operator sets the inspection head 2 at an appropriate position for the changed new type container while referring to the image displayed on the monitor 41. . Similarly, the operator sets the position of the container 50 on the conveyor 10 to an appropriate position while referring to the image displayed on the monitor 41.
[0036]
Subsequently, the defect inspection processing (online processing D) by the defect inspection apparatus 100 will be described based on the flowchart of FIG. 5 and the operation timing chart of FIG.
As described above, when the online process D and the offline process C are selected and the operator selects the online process D, the defect inspection process is performed based on the flow shown in FIG.
[0037]
First, in the online inspection process, online initialization is performed (step S1). Then, the container 50 placed on the conveyor 10 is transported in the positive y-axis direction shown in FIG. 1, and the sensor S1 detects the container opening 50A (Step S2).
After the detection by the sensor S1, the central processing unit 35 of the image processing unit 30 counts a predetermined number of encoder pulses input from the encoder pulse input unit 37. As a result, the central processing unit 35 determines the position of the container opening 50A in the transport direction, and the inspection position is confirmed (step S3).
Then, as shown in the timing chart of FIG. 7, when the sensor S1 signal is turned on, the LED groups L2 to L4 project light toward the container opening 50A in synchronization with this, and the cameras C2 to 5 The inside of the unit 50A is photographed and an image is collected (step S4).
[0038]
When the photography by the cameras C2 to C5 for a predetermined time is completed, in synchronization with this, the LED group L5 emits light toward the container mouth 50A, and the cameras C6 to C8 photograph the side surface of the container mouth 50A. Collect (Step S5).
Next, when the sensor S2 detects the container 50 (step S6), the sensor S2 signal is turned on, and in synchronization with this, the LED group L1 emits light toward the container opening 50A, and the camera C1 sets the container opening 50A. Is photographed, and an image is collected (step S7).
[0039]
When the photographing by the camera C1 for a predetermined time is completed, in synchronization with this, the LED group L2 emits light toward the container opening 50A, and the camera C1 again photographs the top surface of the container opening 50A to collect an image. (Step S8).
When the photographing for a predetermined time by the camera C1 in step S8 ends, in synchronization with this, the LED group L6 emits light toward the container mouth 50A, and the cameras C9 to C11 photograph the side surface of the container mouth 50A. Then, an image is collected (step S9).
[0040]
As described above, the images captured in time series by the cameras C1 to C11 and collected are input to the image processing unit 30, respectively, and a process of determining the presence or absence of a defect is performed (step S10).
As a result, when it is determined that there is no defect (step S11), if the container is left on the transport line and the inspection of another container is to be continued (step S13), the process returns to step S2 and the inspection for the next container is performed. Is performed.
On the other hand, if it is determined that the product is defective (step S11), a discharge signal is output to the discharge signal output unit 36 (see FIG. 1). Then, the container is removed from the transport line as a defective product by a discharge mechanism (not shown) that has received the discharge signal (step S12). Then, when the inspection of another container is continued (step S13), the process returns to step S2 and the inspection is performed on the next container.
[0041]
Further, the defect determination processing in step S10 will be described with reference to the flowchart of FIG. 6 and FIGS. This defect determination processing is performed in the central processing unit 35 of the image processing unit 30.
In the defect determination processing, first, an appropriate luminance inspection processing is performed on each of the images collected by the cameras C2 to C5 (step S101). Here, the luminance value of the luminance window 64 shown in FIG. 9 is measured, and an appropriate luminance threshold value is determined. Note that the luminance threshold for defect determination is set in advance for each inspection part before inspection (set in the off-line window setting process F) and is stored in the central processing unit 35 as a threshold parameter. In response to the measurement results of the 64 luminance values, this luminance threshold is corrected and finally determined.
[0042]
Then, a shape inspection process based on a luminance change in the inspection window 63 is performed on each of the images taken by the cameras C2 to 5 (step S102).
In this shape inspection, for example, as described in Japanese Patent Application Laid-Open No. 2000-55827, the image signal is differentiated using the corrected luminance threshold value, and determination is made based on the waveform width of the differentiated waveform.
[0043]
Next, an appropriate luminance inspection process is performed on each of the images taken by the cameras C6 to C11 (step S103). In this case, the luminance value of the luminance window 70 shown in FIG. 10 is measured, and an appropriate luminance threshold value is determined.
Then, the shape inspection process based on the luminance change in the inspection windows 66 to 69 is performed on each of the images acquired by the cameras C6 to C11 as described above (step S104).
[0044]
Next, a shape inspection process based on a luminance change in the inspection window 61 is performed on the image acquired by the combination of the camera C1 and the LED group L1 (step S105).
Finally, a shape inspection process based on a change in luminance in the inspection window 61 is performed on the image acquired by the combination of the camera C1 and the LED group L2 (step S106).
The reason why the appropriate luminance inspection processing is not performed before the shape inspection processing in steps S105 and S106 is that the light emitted by the LED groups L1 and L2 is epi-illumination, and the subject (the top surface of the container opening 50A). This is for receiving the directly reflected light from the camera. That is, when the subject (the top surface of the container opening 50A) is a non-defective product, the luminance value for each measurement is always stable, so that it is not necessary to perform a proper luminance test using a luminance window.
In this manner, the processing for determining the presence or absence of a defect is completed by sequentially performing all the processing.
[0045]
In the case where the conveyor speed of the conveyor 10 is too high to meet the timing chart shown in FIG. 7, a plurality of the dome-shaped holding bodies 11 are provided, and they are integrally formed along the conveyor conveying direction, and The cameras C1 to C11 and the LED groups L1 to L6 may be separately arranged on the body.
For example, when the two dome-shaped holders 11 are integrally formed along the direction of transport of the container, an image of the inner surface and one side surface of the container mouth 50A at one dome-shaped holder 11 and the other dome-shaped holder An image of the top surface of the container opening 50A and the remaining one side surface can be taken and collected at 11 portions.
With such a configuration, it is possible to cope with a sufficiently high transport speed.
[0046]
According to the embodiment of the present invention described above, it is possible to comprehensively perform a defect inspection on each part (top surface, inner surface, and side surface) of the container opening in a small space.
When the type of the container is changed, the position of the camera and the light projecting portion can be set by setting only the height of the inspection head 2, that is, the distance between the inspection head 2 and the container opening 50A. The setting can be changed collectively for all the inspections of each part. For this reason, the setting can be easily changed in the model change.
[0047]
Further, as described above, when the type is changed, only the height of the inspection head 2 needs to be adjusted for the position setting of the camera and the light projecting unit. Therefore, it is possible to reduce the risk that the setting is shifted by the operator. As a result, the defect detection rate is stabilized, and fluctuations in yield can be prevented.
In the above-described embodiment, in the defect detection processing by the image processing unit 30, the presence or absence of a defect is determined by setting a luminance window and monitoring a luminance change. However, the present invention is not limited to this. Instead, the presence or absence of a defect may be determined using a fixed luminance threshold without providing a luminance window. However, in this case, since the correction of the luminance threshold is not performed, the detection rate is inferior.
[0048]
The material of the container of the above embodiment is not particularly limited, and the present invention can be used as an inspection device for glass, resin, PET, tableware containers, and the like, and can be widely applied to all containers. it can. In addition, the same method can be applied to the inspection of defects of wrinkles, wrinkles, and bubbles in the body, which is another part of the container.
Further, the numbers of the CCD cameras and the LEDs in the above embodiment are merely examples, and the present invention is not limited to these. The light emission of the LED is not limited to white, and may be changed according to the color of the container.
[0049]
【The invention's effect】
As is apparent from the above description, according to the present invention, even when the shape of the container of the inspected object is changed, it is possible to easily and quickly respond, and to detect the defect with a stable high detection rate. It is possible to provide a defect inspection apparatus for a part.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an overall configuration of a container mouth portion according to an embodiment of the present invention.
FIG. 2 is a plan view of an image capturing unit.
FIG. 3 is a side view of an image capturing unit.
FIG. 4 is an operation flowchart of the defect inspection apparatus.
FIG. 5 is an operation flowchart of the defect inspection apparatus.
FIG. 6 is a flowchart of a defect determination process.
FIG. 7 is an operation timing chart of the CCD camera and the LED group.
FIG. 8 is a processing image of the acquired top surface image of the container mouth.
FIG. 9 is a processing image of the acquired inner surface image of the container opening.
FIG. 10 is a processing image of the acquired side image of the container mouth.
FIG. 11 is a schematic diagram showing a configuration of a conventional container opening defect inspection apparatus.
[Explanation of symbols]
1 Image collection unit
2 Inspection head
10 Conveyor
30 Image processing unit
40 Operator operation unit
50 containers
50A container mouth
61 Inspection window
63 Inspection window
64 brightness window
66 Inspection window
67 Inspection window
68 Inspection window
69 Inspection window
70 Brightness Window
100 Defect inspection device
C camera
L LED group
S sensor

Claims (7)

A defect inspection device for inspecting a defect of a container mouth,
A plurality of light projecting units projecting light from different angles to a top surface, an inner surface, and a side surface of the mouth portion of the container to be conveyed, respectively, A plurality of cameras that collect as a two-dimensional image, and an image processing unit that performs image analysis on the image that is collected by the camera,
A plurality of images formed by a combination of the plurality of light projecting units and the plurality of cameras are collected in chronological order by the camera, and using the collected plurality of images, the image processing unit A defect inspection device for a container mouth, which performs a defect inspection of a container mouth. The camera further includes a substantially dome-shaped holding body provided with the plurality of light emitting units and the plurality of cameras,
In a state where the container opening is covered by the holding body, the plurality of light emitting units emit light to the container opening, and the plurality of cameras collect images of the container opening. The defect inspection apparatus for a container mouth portion according to claim 1, wherein The defect inspection of the container mouth part according to claim 1 or 2, wherein a predetermined number of the light emitting parts among the plurality of light emitting parts simultaneously emit light to the container mouth part. apparatus. 4. The defect inspection apparatus for a container mouth according to claim 1, wherein a predetermined number of cameras among the plurality of cameras simultaneously collect images of the container mouth. 5. The image processing unit sets an inspection window for specifying an inspection range in the image for each image collected by the camera, and sets a luminance window for measuring a luminance value in the image.
From the measured brightness value in the brightness window, an appropriate brightness test to determine a brightness threshold for defect determination, and a shape test by changing the brightness of the image in the test window,
The container mouth according to any one of claims 1 to 4, wherein the presence or absence of a defect in the container mouth is determined from the shape inspection using a brightness threshold based on the result of the appropriate brightness test. Defect inspection equipment. 6. The luminance threshold for determining a defect in the proper luminance test varies according to a luminance value measured in a window, and is determined by correcting a preset luminance threshold. Defect inspection device for the container mouth described in the above. A plurality of the substantially dome-shaped holders are provided, and the plurality of holders are integrally formed along the transport direction of the container,
7. The defect inspection apparatus for a container opening according to claim 1, wherein the plurality of light projecting units and the plurality of cameras are disposed on each of the holders.

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