JPH09133640A - Method and equipment for detecting defect - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a defect quickly and surely by projecting an illumination light to a light transmitting container turning about an axis, detecting the intensity distribution in the direction perpendicular to the axis of reflected light, and then making a decision whether a defect is present based on the intensity distribution. SOLUTION: A glass bottle 11 located in an inspection area on a conveyor is turned about the axis thereof by one revolution or more in about 0.3sec. One-dimensional video cameras 14a-14c are disposed opposite to the central part of inspection area on the side of conveyor and a video signal for scanning the glass bottle 11 in the inspection area from left to right every μ sec, for example, is delivered continuously to a defect decision means 15. A light source, i.e., a reflector lamp 16, is disposed opposite to the cameras 14a-14c while interposing the glass bottle 11 in the inspection area between them such that the irradiating direction intersects the optical axis of camera 14a-14c. The means 15 includes a gate circuit and if a video signal exceeding the defect level is produced at the time of production of gate signal, a decision is made that a defect, e.g. a crack is present.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defect inspection method and an apparatus for efficiently inspecting a bottle cap portion of a bottle through which inspection illumination light is transmitted in a refracted state for damage in the longitudinal direction.

[0002]

2. Description of the Related Art In a glass bottle for storing liquor such as beer or liquid seasoning such as soy sauce, there is a possibility that defects such as cracks and cracks may occur due to unsealing, especially in the mouthpiece part sealed with a crown or the like. Very expensive. Therefore, when reusing such a glass bottle, it is necessary to inspect whether or not there is a defect such as a chip or a crack in the base portion.

Usually, when performing such a defect inspection of a glass bottle, not only the reliability of the inspection result is extremely high, but also a large number of glass bottles must be automatically processed. Must be completed in an extremely short time, specifically in about 200 to 300 milliseconds.

In recent years, cracks formed vertically in the mouthpiece along the longitudinal direction of the glass bottle, that is, hair cracks, have become a problem due to the difficulty of their detection, and a defect inspection device for such hair cracks is a problem. As such, for example, JP-A-4-231854 is well known.

The conventional defect inspection apparatus disclosed in Japanese Unexamined Patent Publication No. 4-231854 discloses that a illuminating light from a light source is obliquely projected on the inner side of a base portion of a glass bottle, and transmitted light refracted by the base portion. Is observed with a monitor camera as an image of the base portion, and the presence or absence of hair cracks is determined using an image processing device. In other words, if there are hair cracks on the base of this glass bottle, the phenomenon that the transmitted light is strongly reflected at the part of this hair crack is used to create a high-brightness reflected light in the monitor image of the base of the glass bottle. When it exists, it is determined that the hair crack exists.

[0006]

SUMMARY OF THE INVENTION In a conventional defect inspection apparatus disclosed in Japanese Patent Laid-Open No. 231851/1992 for detecting the presence or absence of hair cracks on a mouthpiece portion of a glass bottle, a two-dimensional image obtained by a monitor camera is used. It is necessary to perform the analysis with an image processing device, and because the relative positional relationship for reflected light from the hair crack present on the mouthpiece part of the glass bottle to enter the monitor camera is limited, the glass bottle can be operated at high speed. It is difficult to rotate and inspect, and the process for that requires a lot of time.

For this reason, the inspection time for each glass bottle is prolonged, and it cannot be said to be practical as a glass bottle defect inspection apparatus that requires a large amount of processing at high speed.

Further, if the speeding up of the image processing is required, a very large capital investment is required for the arithmetic unit for that purpose, which may result in a high cost.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a defect inspection method and its apparatus capable of quickly and reliably detecting the presence or absence of hair cracks on the mouthpiece portion of a glass bottle.

[0010]

According to a first aspect of the present invention, a step of rotating an inspected container around its axis,
Projecting illumination light onto the optically transparent container to be inspected,
Detecting the intensity distribution of the reflected light of the illumination light reflected by the container to be inspected in a direction perpendicular to the axis, and determining whether there is a defect in the container to be inspected based on the intensity distribution of the detected reflected light. And a step of performing a defect inspection method.

Here, the step of determining the presence / absence of a defect in the container to be inspected includes, in addition to the first reflected light reflected by the outer peripheral surface of the container to be inspected, the outer peripheral surface of the container to be inspected to the inner periphery. The reflected light having a higher intensity than the second reflected light which is transmitted to the surface side and reflected on the inner peripheral surface of the container to be inspected and is transmitted again from the inner peripheral surface side to the outer peripheral surface side of the container to be inspected again. If so, it is effective to determine that the container to be inspected has a defect. Further, the defect of the container to be inspected may be a hair crack generated in the mouthpiece portion along the axis.

On the other hand, according to the second embodiment of the present invention, a light source for projecting illumination light to the container to be inspected, which opposes the container to be inspected and which is carried into the inspection region, is provided between the container to be inspected. And an imaging optical system that is located on the opposite side of the light source and that faces the container to be inspected so that the optical axis intersects the projection direction of the illumination light, and is disposed on the focal plane of the imaging optical system. Line sensor located in a plane intersecting the axis of the container to be inspected and detecting the reflected light of the illumination light reflected by the container to be inspected, and the axis of the container to be inspected in the inspection region. In the defect inspection apparatus, there is provided container rotation means for making one or more rotations and determination means for detecting the presence or absence of a defect in the container to be inspected based on a detection signal from the line sensor.

Here, the container further comprises container carrying means for carrying in the container to be inspected from one end side of the inspection region and carrying out the inspected container to be inspected from the other end side of the inspection region. The container rotating means may be incorporated in the conveying means, and the inspection area corresponds to the imaging area of the line sensor, and it is desirable that only one container to be inspected is carried into this inspection area. Further, the determination means, in addition to the first reflected light that reflects the outer peripheral surface of the inspected container and enters the line sensor, transmits from the outer peripheral surface side to the inner peripheral surface side of the inspected container. When reflected light having a higher intensity than the second reflected light which is reflected on the inner peripheral surface of the base portion and is transmitted again from the inner peripheral surface side to the outer peripheral surface side of the container to be inspected is detected, It may be determined that there is a defect, and it is effective that the defect of the container to be inspected is a hair crack generated in the mouthpiece portion along the axis.

Further, the line sensor exists in a plane including the projection direction of the illumination light and the optical axis of the imaging lens, or a plane including the projection direction of the illumination light and the optical axis of the imaging lens. It is effective that a plurality of them are arranged in parallel with the axis of the container to be inspected, and in this case, the plane is preferably perpendicular to the axis of the container to be inspected.

Therefore, when the container to be inspected is carried in to the one end side of the inspection region by the container carrying-in means, the illumination light from the light source is projected on the mouthpiece part of the container to be inspected and the outer peripheral surface of the mouthpiece part is reflected. One reflected light, transmitted from the outer peripheral surface side of the base portion to the inner peripheral surface side, reflected on the inner peripheral surface of the base portion, and again transmitted from the inner peripheral surface side of the base portion to the outer peripheral surface side. The reflected light enters the line sensor via the imaging lens. In this case, since the imaging lens, which is located on the opposite side of the light source with the container to be inspected in between, faces the container to be inspected so that its optical axis intersects the projection direction of the illumination light, the line sensor The illumination light from the light source does not directly enter the.

In this state, since the container to be inspected is rotated around its axis by the container rotating means, when there is a defect in the mouthpiece part, it permeates from the outer peripheral surface side of the mouthpiece part to the inner peripheral surface side and again the mouthpiece part. Illumination light incident from the inner peripheral surface side to the outer peripheral surface side of the portion is reflected by the defective portion and guided from the imaging lens to the line sensor. Since the reflected light at this defective portion has a higher intensity than the second reflected light reflected on the inner peripheral surface of the base portion, the determination means, in addition to the first reflected light, the second reflected light Also detects a high-intensity reflected light, it is determined that there is a defect in the base portion.

In this way, when the container to be inspected is carried out from the other end side of the inspection region, a new container to be inspected is carried in from one end side of the inspection region by the container loading means, and the defect inspection is performed on this container to be inspected. Then, only one inspected container always exists in the inspection area.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which a defect inspection apparatus according to the present invention capable of realizing a defect inspection method according to the present invention is applied to an inspection of a hair crack generated in a mouthpiece portion of a glass bottle will be described with reference to FIGS. While explaining in detail.

As shown in FIG. 1 showing the schematic configuration of the present embodiment, glass bottles 11 which are conveyed in a straight line from the right side to the left side in the figure are mounted on a glass bottle conveying conveyor (not shown) at predetermined intervals, and While passing through the inspection area Z _T set in the middle of the transportation route for a predetermined time, for example, 0.3 seconds, the presence or absence of the hair crack 13 generated in the mouthpiece portion 12 (see FIG. 2) is determined. Has become.

The interval between the glass bottles 11 mounted on the glass bottle conveying conveyor is set longer than the length of the inspection area Z _T , so that two or more glass bottles 11 do not exist in the inspection area Z _T at the same time. doing.

In this glass bottle conveying conveyor, at least the glass bottle 11 in the inspection area Z _T is rotated once or more around its axis C _W , specifically, in the inspection area Z _T.
Since the time during which 1 stays is set to 0.3 seconds, the glass bottle 11 is rotated at a rate of 1 rotation or more in 0.3 seconds.
A container rotating means (not shown) for rotating the container is incorporated. In this case, as the glass bottle transporting conveyor and the container rotating means in the present embodiment, conventionally known ones can be used as they are, and therefore the description of their specific configurations will be omitted.

A plurality of (three in the present embodiment) one-dimensional video cameras 14 are provided beside the glass bottle conveyor.
The a, 14b, and 14c are arranged so as to face the central portion of the inspection region Z _T. These one-dimensional video cameras 14
a~14c is not shown, it arranged an imaging lens (not shown) is set to a direction substantially perpendicular to the focal plane of the imaging lens for each transport direction of the optical axis C _Ca, C _Cb, C _Cc glass bottles 11 And a line sensor. These line sensors are formed by arranging a large number of CCDs and the like in a straight line, and the length of each line sensor is the inspection area Z _T described above.
Corresponding to, the output signal (hereinafter, referred to as a video signal) is output to the defect determining means 15. In the present embodiment, while the glass bottle is in the inspection area Z _T , a video signal for scanning an image from the left side to the right side in FIG. The output is continued, and when the time for which the glass bottle 11 stays in the inspection area Z _T is set to 0.3 seconds, 6000 for one glass bottle 11 is output.
Scanning will be performed once.

As shown in FIG. 2 showing the image pickup areas of the respective one-dimensional video cameras 14a to 14c in the present embodiment, the one-dimensional video cameras 14a to 1c using these line sensors are shown.
The imaging regions Z _Ca , Z _Cb , and Z _Cc of 4c are set at right angles to the axis C _W of the glass bottle 11, that is, parallel to the transport direction of the glass bottle 11, and are vertically displaced along the axis C _W of the glass bottle 11. Has become. As a result, the hair crack 13
It is possible to reliably detect this even if it occurs only in a part of the base 12.

The reflex lamp 16 as the light source of the present invention, which is located on the opposite side of the one-dimensional video cameras 14a to 14c with the glass bottle 11 interposed therebetween in the inspection region Z _T , emits its illumination light L _O (see FIG. 3). optical axis C _Ca direction one-dimensional video camera 14 a to 14 c, C _Cb, so as to intersect the C _Cc, faces the glass bottle 11 in the examination region Z _T, in this embodiment of the inspection area Z _T The direction of irradiation of the illumination light L _O (optical axis C _{L of the} reflex lamp 16) and the one-dimensional video camera 1 with respect to the axis C _W of the glass bottle 11 located in the central portion.
The angle α with the optical axis C _{Cb of} 4b is set to around 135 degrees. Further, in order to prevent the illumination light L _O from the reflex lamp 16 from directly entering the one-dimensional video cameras 14a to 14c, the reflex lamp 16 and the one-dimensional video camera 14a.
A light-shielding plate 17 is interposed between the above and 14c.

[0025] In the present embodiment uses a diffused light from Refuranpu 16 directly as the illumination light L _O, place the collimator lens in front of Refuranpu 16, the illumination light L
_When projecting _O as a parallel light flux on the glass bottle 11,
It is possible to separate the reflex lamp 16 and the inspection region Z _T from each other, and it is possible to further reduce the influence of ambient light incident on the one-dimensional video cameras 14a to 14c. Also,
The intensity of the illumination light L _O may be adjusted according to the light transmittance of the glass bottle 11.

Therefore, the illumination light L _O from the reflex lamp 16
Among them, a part of the reflected light reflected by the base portion 12 of the glass bottle 11 is incident on the one-dimensional video cameras 14a to 14c, but as shown in FIG. 3 showing the relationship between the illumination light L _O and the reflected light. In the one-dimensional video cameras 14a to 14c, the first reflected light L _R1 of the illumination light L _O reflected on the outer peripheral surface of the base portion 12 of the glass bottle 11 and the outer peripheral surface side to the inner peripheral surface side of the base portion 12. The second reflected light L _R2 which is transmitted through the inner peripheral surface of the mouthpiece portion 12 and is transmitted again from the inner peripheral surface side to the outer peripheral surface side of the mouthpiece portion 12 and the third reflected light at the hair crack 13. The reflected light L _R3 of is incident. In this case, the above-mentioned second reflected light L _R2 is the first and third reflected light L _R1 ,
It is considerably weaker than the light intensity of L _R3 , and the other secondary reflected light is extremely weaker than the second reflected light L _R2 and can be ignored.

However, the third reflected light L _R3 is reflected by the hair crack 13 only when the rotational phase of the hair crack 13 with respect to the one-dimensional video cameras 14a to 14c is at a specific position as shown in FIG. The three reflected lights L _R3 enter the one-dimensional video cameras 14a to 14c, and do not enter the one-dimensional video cameras 14a to 14c in other rotation phases. This specific position is generally within a range of about 6 degrees around the axis C _W of the glass bottle 11, and the hair crack 13 can be detected only in such a positional relationship. In the present embodiment, the imaging regions Z _Ca , Z _Cb , and Z _Cc are repeatedly scanned 6000 times during one rotation of the glass bottle 11, so that it is easy to reliably detect the hair crack 13. Imagine that.

The structure of the defect determining means 15 in this embodiment is shown in FIG. That is, the defect determining means 15 in the present embodiment outputs the synchronization signal S _T at every predetermined time (for example, 50 microseconds) and starts the scanning of the video signal S _V by the line sensor, and the synchronization circuit 18. A gate circuit 19 to which a predetermined gate level, a gate delay time T _D and a gate duration time T _G have been input in advance, and a video signal S _{V based} on a preset defect level of the video signal S _V
A binarization circuit 20 for binarizing _V , an AND gate 21 which opens only when the video binarization signal S _O is output from the binarization circuit 20 while the gate signal S _G is being output,
A one-shot pulse output circuit 22 that outputs a one-shot pulse S _P by opening the AND gate 21;
Based on the output of the one-shot pulse S _P and a defect detection alarm S _W alarm output circuit 23 continues to output to the inspection is started for the next glass bottle 11.

The gate circuit 19 has a higher intensity than the second reflected light L _R2 contained in the video signal S _V and the first reflected light L _R1.
Although an appropriate reflected light level having a lower intensity than that is set as the gate level, in the present embodiment, the gate level and the defect level in the binarization circuit 20 are set to the same value. Then, with respect to the output of the first video binarized signal S _O after the output of the synchronization signal S _T , the gate signal S _G is output with a proper gate delay time T _D for a predetermined time until the next synchronization signal is output, For example, it outputs only for 20 microseconds, and the AND gate 21 is opened / closed according to the presence / absence of the output of the next video binarization signal S _O during this period.

That is, the synchronizing signal S _T output from the synchronizing circuit 18 and the video signal S _V from the one-dimensional video cameras 14a to 14c, the gate signal S _G output from the gate circuit 19, and the binarizing circuit 20. As shown in FIG. 5 showing the relationship among the video binarized signal S _O output from the one-shot pulse S _P and the defect detection alarm S _W , the gate level was exceeded immediately after the generation of the synchronization signal S _T. Video signal S _V
Enters the gate circuit 19, a predetermined gate delay time T _D
Later, the gate signal S _G is AND gate 2 for a predetermined time T _G.
It is output to 1. During this period, when the video signal S _V exceeding the defect level is input to the video binarization circuit 20, the AND gate 21 opens and the one-shot pulse output circuit 22 outputs the one-shot pulse S _P to the alarm output circuit 23. Is output, and the defect detection alarm _SW is continuously output from the alarm output circuit 23 until the next defect inspection of the glass bottle 11 is started at the latest.

According to this embodiment, the hair cracks 13 present on the mouthpiece 12 of the glass bottle 11 are detected at 20 minutes per minute.
Even at 0 inspection speed, it is possible to surely perform with a probability of almost 100%.

In the above embodiment, the defect determining means 15
If the video signal S _V exceeding the defect level is output during the output of the gate signal S _G inside the gate circuit 19, it is determined that a defect such as the hair crack 13 exists in the glass bottle 11 under inspection. However, when the video signal S _V exceeding the defect level is detected a plurality of times during one scanning, it is determined that a defect such as the hair crack 13 exists in the glass bottle 11 under inspection. Is also possible.

FIG. 6 shows the structure of the defect determining means 15 in such another embodiment of the present invention. That is, the defect determining means 15 in the present embodiment outputs the synchronization signal S _T at every predetermined time (for example, 50 microseconds) and starts the scanning of the video signal S _V by the line sensor, and the synchronization circuit 18. A binarization circuit 20 that binarizes the video signal S _{V based} on a preset defect level of the video signal S _V, and a video 2 output from the binarization circuit 20.
Valued signal S _O compares the count number n _C with a preset set count n _R with counts up the, if the count number n _C is larger than the predetermined count number n _R,
A counting comparator circuit 24 outputs a comparator signal S _C, comparator signal based on the output of the S _C, at the latest alarm output circuit continues to output the defect detection alarm S _W to the inspection of the next glass bottle 11 is started 23 and.

The count of the video binarized signal S _{O in} the counting comparator circuit 24 is reset each time the synchronizing signal S _T is output from the synchronizing circuit 18, and in this embodiment. The set count number n _R is set to 2.

That is, the synchronizing signal S _T output from the synchronizing circuit 18 and the video signal S _V from the one-dimensional video cameras 14a to 14c, and the video binarizing signal S _O output from the binarizing circuit 20, The comparator signal S _C output from the counting comparator circuit 24 and the defect detection alarm _SW
As shown in FIG. 7 showing the relationship between the video signal S _V and the defect level after the generation of the synchronization signal S _T , the binarizing circuit 20 converts the video signal S _V into a video binarizing signal S _{O and} a counting comparator circuit 24. Is input to the counting comparator circuit and is counted up by the counting comparator circuit and compared with the set count number n _R. This count number n _C is the set count number n _R
Or more, that is, when it is determined that it is 2 or more,
The comparator signal S _C is output to the alarm output circuit 23,
The defect output alarm _SW is continuously output from the alarm output circuit 23 until the next defect inspection of the glass bottle 11 is started at the latest.

The count number n _{C of} the video binarized signal S _O counted up by the counting comparator circuit 24.
Is reset to 0 by the output of the next synchronizing signal S _T from the synchronizing circuit 18.

[0037]

According to the defect inspection method of the present invention, the inspected container is rotated around its axis and at the same time the illumination light is projected onto this inspected container, and the intensity of the reflected light in the direction perpendicular to the axis of the inspected container. Since the distribution is detected and the presence or absence of a defect in the container to be inspected is determined based on the detected intensity distribution of the reflected light, the defect inspection can be performed on the container to be inspected quickly and accurately.

Further, according to the defect inspection apparatus of the present invention, the light source that projects the illumination light to the container to be inspected, which opposes the container to be inspected, which is brought into the inspection region, and rotates around the axis thereof. An imaging optical system that is located on the opposite side of the light source with the container to be inspected in between and faces the container to be inspected so that the optical axis intersects the projection direction of the illumination light, and the focal plane of this imaging optical system. The line sensor located in the plane intersecting the axis of the container to be inspected and detecting the reflected light of the illumination light reflected by the container to be inspected, and the container to be inspected based on the detection signal from this line sensor Since the determination means for detecting the presence / absence of a defect is provided, a quick and accurate defect inspection of a container to be inspected can be realized at low cost.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing an outline of an embodiment of a defect inspection apparatus according to the present invention.

FIG. 2 is a conceptual diagram showing an imaging area of each one-dimensional video camera in the embodiment shown in FIG.

3 is an optical path conceptual diagram showing a relationship between illumination light and reflected light in the embodiment shown in FIG.

FIG. 4 is a block diagram of defect determining means in the embodiment shown in FIG.

5 is a time chart showing a relationship among a synchronization signal and a video signal, a gate signal, a video binarized signal, a one-shot pulse, and a defect detection alarm in the defect determining means shown in FIG.

FIG. 6 is a block diagram showing another embodiment of the defect determining means.

7 is a time chart showing a relationship among a synchronization signal and a video signal, a gate signal, a video binarized signal, a one-shot pulse, and a defect detection alarm in the defect determining means shown in FIG.

[Explanation of symbols]

11 Glass Bottle 12 Base Part 13 Hair Rack 14a, 14b, 14c One-dimensional Video Camera 15 Defect Judgment Device 16 Ref Lamp 17 Shading Plate 18 Synchronous Circuit 19 Gate Circuit 20 Binarization Circuit 21 AND Gate 22 One-shot Pulse Output Circuit 23 Alarm Output Circuit 24 Counting comparator circuit Z _T Inspection area C _W Glass bottle axis C _Ca , C _Cb , C _Cc Optical axis of one-dimensional video camera Z _Ca , Z _Cb , Z _Cc Imaging area of one-dimensional video camera L _O Illumination light C _L Optical axis of reflex lamp L _R1 First reflected light L _R2 Second reflected light L _R3 Third reflected light S _T Sync signal S _V Video signal T _D Gate delay time T _G Gate duration S _O Video binarized signal S _P One-shot pulse S _W Defect detection alarm S _G Gate signal S _C Comparator signal

Claims (11)

[Claims] 1. A step of rotating an inspected container about its axis, a step of projecting illumination light on a light-transmissive inspected container, and an axis of reflected light of the illumination light reflected by the inspected container. A defect inspection method comprising: a step of detecting an intensity distribution in a direction orthogonal to the step; and a step of determining the presence or absence of a defect in the inspected container based on the detected intensity distribution of the reflected light. 2. The step of determining the presence or absence of a defect in the container to be inspected includes, in addition to the first reflected light reflected on the outer peripheral surface of the container to be inspected, the outer peripheral surface of the container to be inspected to the inner peripheral surface. The reflected light having a higher intensity than the second reflected light that is transmitted to the side and reflected on the inner peripheral surface of the container to be inspected and is transmitted again from the inner peripheral surface side to the outer peripheral surface side of the container to be inspected is distributed. The defect inspection method according to claim 1, wherein the inspection container determines that a defect exists in the inspected container. 3. The defect inspection method according to claim 1, wherein the defect of the container to be inspected is a hair crack generated in the mouthpiece portion along the axis. 4. A light source which projects an illumination light to the container to be inspected, which is opposed to a light-transmissible container to be inspected and which is carried into the inspection region, and on the opposite side of the light source with the container to be inspected interposed therebetween. An imaging optical system that is located and faces the container to be inspected so that the optical axis intersects the projection direction of the illumination light, and is disposed on the focal plane of the imaging optical system and reflected by the container to be inspected. A line sensor that detects reflected light of the illumination light and is located in a plane that intersects with the axis of the container to be inspected, and a container rotating unit that rotates the container to be inspected once or more around the axis in the inspection region. A defect inspection apparatus comprising: a determination unit that detects the presence or absence of a defect in the inspected container based on a detection signal from the line sensor. 5. The container carrying means for carrying in the inspected container from one end side of the inspection region and carrying out the inspected container already inspected from the other end side of the inspection region, The defect inspection apparatus according to claim 4, wherein the container rotating means is incorporated in the means. 6. The inspection area corresponds to an imaging area of the line sensor, and only one container to be inspected is carried into the inspection area.
The defect inspection device described in 1. 7. The determination means, in addition to the first reflected light that reflects the outer peripheral surface of the inspected container and enters the line sensor, moves from the outer peripheral surface side to the inner peripheral surface side of the inspected container. Reflected with a higher intensity than the second reflected light that passes through and is reflected by the inner peripheral surface of the container to be inspected, and is transmitted again from the inner peripheral surface side of the container to be inspected to the outer peripheral surface side and is incident on the line sensor. 7. When the light is detected, it is determined that the inspected container has a defect, and the container is inspected.
The defect inspection apparatus according to any one of 1. 8. The defect inspection apparatus according to claim 4, wherein the defect of the container to be inspected is a hair crack generated in the mouthpiece portion along the axis. 9. The defect according to claim 4, wherein the line sensor exists in a plane including a projection direction of the illumination light and an optical axis of the imaging lens. Inspection device. 10. A plurality of the line sensors are arranged parallel to a plane including a projection direction of the illumination light and an optical axis of the imaging lens along an axis of the container to be inspected. The defect inspection apparatus according to any one of claims 4 to 8. 11. The defect inspection apparatus according to claim 9, wherein the plane is perpendicular to the axis of the container to be inspected.