JP2015169441A - Opening inspection device of glass bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening inspection device of a glass bottle that can improve the inspection accuracy and can be downsized.SOLUTION: The opening inspection device includes: a rotation mechanism for rotating a glass bottle 11; a projector 21 for radiating light to an opening 11d of the rotating glass bottle 11 from the obliquely lower side; and a line sensor camera 22 for detecting a defect in the range from the top surface 19c to a skirt 19b by detecting the light having passed through the wall surface of the opening 11d of the glass bottle 11. The line sensor camera 22 has a gate angle θ2, and focuses on the longitudinal whole region of the opening 11d of the glass bottle 11, thereby detecting the defect.

Description

  The present invention relates to a glass bottle mouth inspection device that uses light transmitted through the mouth of a glass bottle to inspect the presence or absence of defects such as bubbles, streaks, chipped screws, and opaque foreign matters formed in the mouth. .

  Conventionally, a light source is placed near the glass bottle, a camera is placed on the opposite side of the glass bottle from the light source, and the transmitted light of the light emitted from the light source to the glass bottle is received by the camera to produce the bottle. There is known an inspection apparatus for inspecting (see, for example, Patent Document 1).

JP 2010-8305 A

In Patent Document 1, for example, when the inspection portion of the glass bottle is the mouth portion of the glass bottle, the light source is disposed on the side of the glass bottle, and the camera is placed on the side opposite to the light source with respect to the mouth portion. If it is placed diagonally downward or upward so that it points to the part, the distance from each part of the mouth to the camera will be different, making it difficult to focus on the whole mouth, and inspection accuracy of the mouth defects Becomes lower. Therefore, if the camera is placed away from the mouth, it becomes easier to focus on the entire mouth, but the subject to be examined is difficult to see because the subject is far away, for example, using a telephoto lens, close-up ring, etc. It is necessary to enlarge. This increases the size of the camera, which in turn increases the size of the inspection apparatus.
An object of the present invention is to provide a mouth inspection device for a glass bottle that can improve the inspection accuracy and can be miniaturized.

  In order to solve the above-described problems, the present invention provides a rotating mechanism for rotating a glass bottle, a projector for irradiating light to the mouth of the rotating glass bottle from obliquely below, and light transmitted through the mouth wall of the glass bottle. A line sensor camera that detects and detects abnormalities from the top to the skirt, and the line sensor camera has a tilt angle and can be detected by focusing on the entire length of the mouth of the glass bottle. Features.

According to the above configuration, since the tilt angle is provided, it is possible to focus on the entire longitudinal direction of the mouth even if the mouth wall surface is oblique to the optical axis of the camera. It is possible to increase the inspection accuracy of the mouth.
In addition, in the present invention, the camera is placed closer to the mouth portion as compared with the conventional case where the camera is placed away from the mouth portion and a telephoto lens or the like is used in order to widen the focusing range. Therefore, it is easy to confirm the inspection site and the observation range can be widened, so that the inspection accuracy can be improved. Furthermore, the camera can be downsized, and the inspection apparatus can be downsized.

In the above configuration, a line control film may be provided on the exit surface of the projector. According to this configuration, since the line control film is provided on the emission surface of the projector, the diffusion of the light emitted from the projector is limited, and the light can be directed in the direction of transmitting through the mouth wall surface. For this reason, the contrast of the image image | photographed with a line sensor camera can be raised, and the fault of a mouth part can be detected easily.
Further, in the above configuration, the light from the projector may be applied to at least a region from the top outer wall of the mouth portion of the glass bottle to the bottom of the skirt. According to this configuration, it is possible to minimize the inspection range of defects that are likely to occur at the mouth, and to increase inspection efficiency.

Further, in the above configuration, the light transmitted through the mouth wall surface of the glass bottle is directly photographed by the line sensor camera without entering the other part of the mouth wall surface. The photographed image becomes clear and the inspection accuracy can be improved without being photographed.
In the above configuration, the line sensor camera may detect the amount of transmitted light to be photographed, and when the amount of light decreases beyond a threshold value, the light amount of the projector may be increased. According to this configuration, even if the mouth portion of the glass bottle is thick or dark, the brightness of the image can be ensured, defects can be easily confirmed, and the inspection accuracy can be increased. .

  Further, in the above configuration, the line sensor camera has an area sensor camera function, selects a predetermined line in the captured image as the area sensor camera at the initial setting, and selects the selected line during the mouth inspection. The image may be processed. According to this configuration, the area sensor camera can confirm the location most suitable for the inspection of the mouth, and by selecting the line sensor at the location, the inspection accuracy can be further improved and the usability can be improved. it can.

In the present invention, since the tilt angle is provided, the entire area in the vertical direction of the mouth can be focused even if the mouth wall surface is inclined with respect to the optical axis of the camera. It is possible to increase the inspection accuracy of the mouth.
In addition, in the present invention, the camera is placed closer to the mouth portion as compared with the conventional case where the camera is placed away from the mouth portion and a telephoto lens or the like is used in order to widen the focusing range. Therefore, it is easy to confirm the inspection site and the observation range can be widened, so that the inspection accuracy can be improved. Furthermore, the camera can be downsized, and the inspection apparatus can be downsized.

It is a top view which shows the glass bottle opening part test | inspection apparatus of one Embodiment of this invention. It is a side view which shows the state which test | inspects a glass bottle with a mouth part inspection apparatus. It is sectional drawing which shows the upper part of a glass bottle. It is a figure which shows the photodetector of a camera main body. FIGS. 5A and 5B are explanatory diagrams illustrating imaging by a line sensor camera, FIG. 5A is a perspective view illustrating an imaging range, and FIG. 5B is a diagram illustrating an image obtained by imaging. 6A and 6B are explanatory diagrams showing image processing of the inspection result of the mouth, FIG. 6A is a diagram showing an original image obtained by imaging, and FIG. 6B is a difference image obtained by performing differential processing on the original image. FIG. It is explanatory drawing which shows an example of the test result of the fault of a mouth part.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing a glass bottle opening inspection device 10 according to an embodiment of the present invention.
The glass bottle opening inspection device 10 (hereinafter simply referred to as “mouth inspection device 10”) is provided on the production line of the glass bottle 11 or on the filling line of the contents of the glass bottle 11.
The mouth inspection device 10 includes a star wheel 12 that sends a glass bottle 11 carried in from a carry-in conveyor (not shown) in the circumferential direction, and various defects in the mouth of the glass bottle 11 (foam, opaque foreign matter, streaks, screw chips, etc.) ) For detecting the mouth portion, a disk-like drive wheel 14, and a control portion 20 for controlling the mouth portion inspection portion 13, the drive wheel 14, and the like. The control unit 20 is, for example, a personal computer that includes a CPU, a RAM, a ROM, and the like and has various software installed.

  The star wheel 12 includes a disk-shaped wheel 15 and a rotation shaft 16 provided at the center of the wheel 15, and the wheel 15 rotates about the rotation shaft 16 in the counterclockwise direction in FIG. The wheel 15 has a substantially semicircular cutout portion 15 a for accommodating the glass bottle 11 on the outer peripheral portion. A plurality of notches 15 a are provided at substantially equal intervals in the circumferential direction of the wheel 15. A pair of rollers 17 and 17 for guiding the glass bottle 11 are provided on the bottom side of each notch 15 a of the wheel 15.

  On the outer peripheral side of the star wheel 12, the drive wheel 14 and an annular guide frame (not shown) that surrounds the star wheel 12 from the outer peripheral side and guides the movement of the glass bottle 11 are provided. The glass bottle 11 is accommodated in the notch portion 15a in a vertical position and is pressed against the rollers 17 and 17 when the guide frame is in close contact with the outer peripheral portion of the glass bottle 11. During the inspection of the glass bottle 11, the glass bottle 11 is rotated around the central axis C by a drive wheel 14 that is driven to rotate. The drive wheel 14 and the rollers 17 and 17 constitute a rotation mechanism 18 that rotates the glass bottle 11 within the notch 15a.

  The glass bottles 11 carried from the carry-in conveyor into the cutout portion 15a in the direction D1 in FIG. In the vicinity of the star wheel 12, in addition to the mouth inspection unit 13, a measuring device for defects, dimensions, and the like is provided. However, in this embodiment, the other measuring devices are not shown. After completion of the inspection, the glass bottle 11 is unloaded from the star wheel 12 in the direction D2 in FIG. 1 by a carry-out conveyor (not shown) and moved downstream of the production line.

  The mouth inspection unit 13 includes a projector 21 disposed on the radially inner side of the star wheel 12 with respect to the glass bottle 11, and a line sensor camera 22 disposed on the radially outer side of the star wheel 12 with respect to the glass bottle 11. . The light from the projector 21 is applied to the mouth portion 11d of the glass bottle 11, passes through the mouth portion 11d, is detected by the line sensor camera 22, and is subjected to image processing by the control portion 20. The projector 21 and the line sensor camera 22 are fixed to another bracket (not shown) independent of the star wheel 12.

FIG. 2 is a side view showing an inspection state of the glass bottle 11 by the mouth inspection unit 13.
The glass bottle 11 is placed on a slide plate 12A provided below the star wheel 12 (see FIG. 1), and is driven to rotate on the slide plate 12A.
The glass bottle 11 is provided at the bottom portion 11a, a cylindrical body portion 11b extending upward from the bottom portion 11a, a shoulder portion 11c extending upward from the body portion 11b and tapering toward the upper end side, and the upper end of the shoulder portion 11c. And a cylindrical mouth portion 11d. The glass bottle 11 is manufactured, for example, by blow molding molten glass injected into a mold.
A projector 21 is disposed below the mouth portion 11d of the glass bottle 11, and light from the projector 21 is irradiated obliquely from below the mouth portion 11d. The line sensor camera 22 is disposed above the mouth portion 11d of the glass bottle 11, and the light of the projector 21 that has passed through the mouth portion 11d is detected by the line sensor camera 22.

  The light projector 21 is a surface light source that irradiates light from a substantially flat light projecting surface 21a (emission surface), and includes, for example, a line control film 23 that uses an LED as a light source and covers the entire surface of the light projecting surface 21a. The line control film 23 restricts the diffusion of light passing therethrough and imparts directivity to the light, and the light passing through the line control film 23 becomes parallel light L. That is, the light projected from the light projecting surface 21a becomes parallel light L that travels straight in the normal direction of the light projecting surface 21a and is irradiated to the mouth portion 11d. The irradiation angle θ1 of the parallel light L from the projector 21 is, for example, 45 ° with respect to the horizontal line.

The line sensor camera 22 includes a lens 24 that receives the parallel light L, and a camera body 25 to which the lens 24 is attached. The line sensor camera 22 receives the parallel light L that is disposed on the optical path of the parallel light L and passes through the rotating glass bottle 11. Receive light.
The lens 24 is disposed so as to be inclined so that the lens surface 24a on which the parallel light L is incident is substantially orthogonal to the parallel light L. That is, the lens surface 24a is directed so as to photograph the mouth portion 11d from obliquely above. The camera body 25 includes a photodetector 26 (see FIG. 4) that detects light.

  Since the lens surface 24a is provided to be inclined with respect to the mouth portion 11d, the distance between the lens surface 24a and the mouth portion 11d is different in the height direction of the mouth portion 11d, and at the upper end surface of the mouth portion 11d. The distance decreases as the distance from the top surface 19c increases. For this reason, the camera body 25 is attached to the lens 24 while being inclined by the tilt angle θ2. The tilt angle θ2 is provided so that the distance between the camera body 25 and the lens 24 is increased toward the lower side of the camera body 25 corresponding to the distance between the lens surface 24a and the mouth portion 11d. As described above, by providing the tilt angle θ2, even when the mouth portion 11d is photographed obliquely from above, it is possible to achieve a good focus over the entire area in the vertical direction (vertical direction) of the mouth portion 11d. The entire mouth portion 11d can be photographed clearly.

FIG. 3 is a cross-sectional view showing the upper part of the glass bottle 11.
The mouth portion 11d of the glass bottle 11 includes a cylindrical tubular portion 19, a helical screw portion 19a projecting radially outward from an upper portion of the outer peripheral surface 19h of the tubular portion 19, and a cylindrical portion below the screw portion 19a. And a skirt 19b that protrudes radially outward from the lower portion of the shape portion 19. Reference numeral 19j denotes an inner peripheral surface of the cylindrical portion 19, and 19k denotes an opening of the cylindrical portion 19.
The cylindrical portion 19 has an upper end surface, that is, a top surface 19c, which is substantially parallel to the bottom portion 11a (see FIG. 2), and is substantially horizontal when the glass bottle 11 is erected. A lid (not shown) that closes the mouth portion 11d is screwed into the screw portion 19a. Reference numeral 19d denotes a skirt above the skirt 19b, and 19e denotes a skirt below the skirt 19b.

In the mouth inspection unit 13 (see FIG. 2), the presence or absence of a defect in the range of the height H from the top surface 19c to the lower skirt 19e is inspected in the height direction of the mouth 11d. Therefore, the parallel light L of the projector 21 (see FIG. 2) has at least a point 19f at the corner between the outer peripheral surface 19h and the top surface 19c and a point 19g on the inner peripheral surface 19j having the same height as the lower skirt 19e. A range passing through as the end (a range indicated by a thick line) is irradiated, and parallel light L in this range is incident on the line sensor camera 22 (see FIG. 2) and photographed. The range of the parallel light L is the measurement region R1. If the parallel light L is transmitted through the measurement region R1, the tube formed by rotating the section of the height H at the mouth portion 11d (the range indicated by the bold line) by 360 ° by measuring the amount of the transmitted light. It can be inspected for the presence or absence of defects in the shaped part.
In the case of actual inspection, the parallel light L is irradiated to the irradiation region R2 illustrated so as to include the measurement region R1.

  As shown in FIGS. 2 and 3, by irradiating the parallel light L obliquely from below to the mouth portion 11d, a part of the parallel light L passes the measurement region R1 only once from the outer surface to the inner surface of the mouth portion 11d. The transmitted light reaches the line sensor camera 22. For this reason, the mouth portion 11d can be photographed without passing through other portions of the mouth portion 11d, and the state of the mouth portion 11d can be clearly photographed by the line sensor camera 22. The range of the irradiation angle θ1 can be changed within a range in which the line sensor camera 22 can detect the parallel light L without passing through the other part of the mouth portion 11d without passing through the measurement region R1.

FIG. 4 is a diagram showing the photodetector 26 of the camera body 25.
The photodetector 26 as a light receiving unit that receives the parallel light L (see FIG. 3) includes a substrate 26a and a substantially rectangular sensor 26b supported on the substrate 26a. The sensor 26b can be used as an area sensor and a line sensor under the control of the control unit 20 (see FIG. 2). That is, the line sensor camera 22 can also be used as an area sensor camera. As a form, the sensor 26b is an area sensor in which a plurality of image sensors are arranged vertically and horizontally. From the image sensors of the area sensor, a plurality of image sensors arranged in a line in a vertical row are selected to form a line sensor. It is possible.
When the control unit 20 uses the sensor 26b as a line sensor, the control unit 20 selects an arbitrary vertical line 27 of the sensor 26b to function as the sensor. When the sensor 26b is used as a line sensor, the number of data can be reduced and the processing speed, frame rate, image quality, and the like can be improved as compared with the case where the sensor 26b is used as an area sensor.

FIGS. 5A and 5B are explanatory diagrams showing imaging by the line sensor camera 22, FIG. 5A is a perspective view illustrating the imaging range, and FIG. 5B is a diagram showing an image 32 obtained by imaging.
As shown in FIG. 5A, the area sensor function of the line sensor camera 22 (see FIG. 2) is used to photograph the mouth portion 11d of the rotating glass bottle 11 as shown by an arrow from obliquely above. The Reference numeral 31 in the figure denotes an imaging range in the area sensor.
From this imaging range 31, a line 27 that is actually used for measurement as a line sensor is selected. The line 27 passes through the approximate center of the mouth portion 11 d of the glass bottle 11.

  If the line sensor camera 22 does not have an area sensor function, the entire mouth portion 11d of the glass bottle 11 cannot be grasped only by the function of the line sensor, so that the mouth portion 11d of the glass bottle 11 is measured. It is difficult to find a suitable line 27 position. On the other hand, since the line 27 can be easily determined by using the line sensor camera 22 having the area sensor function as in the present embodiment, the usability can be improved and the measurement position is set. Work man-hours can be reduced.

In FIG. 5B, the photographing at the line 27 in FIG. 5A is continued until the glass bottle 11 (see FIG. 5A) rotates once, and the lines photographed at every predetermined frame rate are displayed. An image 32 in which images are combined and combined on data is shown. In the image 32, processing is performed so that the mouth portion 11d is output as a diagram seen from the side so that the position of the mouth portion 11d can be easily understood.
In the image 32, a threaded portion 19a, a skirt 19b, a top surface 19c, an upper skirt 19d, and a lower skirt 19e are depicted.

6A and 6B are explanatory diagrams showing image processing of the inspection result of the mouth portion 11d. FIG. 6A shows the original image 35 obtained by imaging, and FIG. It is a figure which shows the difference image 36 obtained by being done.
In FIG. 6A, the original image 35 actually captured may have uneven light refraction due to unevenness of the surface of the mouth portion 11d, variation in thickness, variation in color density, etc. May be emphasized depending on the location, so that, for example, the opaque foreign matter 37 and 38, which are defects, are darkly projected on the cylindrical portion 19 and the screw portion 19a in the original image 35, and it may be difficult to confirm. . In addition, defects such as bubbles and screw chips are reduced because the length of light that passes through the glass is shortened, so colored transparent glass bottles appear bright, but they cannot be distinguished from other bright parts. It may be difficult to do.

Therefore, difference processing is performed on the original image 35 using the line data of the two lines A and B. This difference processing is described in Japanese Patent No. 4848448 as a known technique. Here, the difference process will be briefly described.
First, an interval K between the two lines A and B is set. That is, the interval between the line data of the line A and the line data of the line B obtained by the line sensor. Next, with respect to the line data of 360 ° in the circumferential direction of the mouth portion 11d, lines A and B are set in order from 0 ° to 359 °, and the differential processing is performed by subtracting the line data of line B from the line data of line A. The angle in the circumferential direction for differential processing may not be 360 °, but may be a predetermined circumferential angle. Then, a difference image 36 shown in FIG. 6B is drawn with only the difference being larger than a predetermined difference threshold. In the difference image 36, the shape of the mouth portion 11d (the screw portion 19a, the skirt 19b, the top surface 19c, the upper skirt 19d, and the lower skirt 19e) is hardly displayed, and the opaque foreign matters 37 and 38 that are defects appear. Existence of defects can be confirmed more easily than in the original image 35 (see FIG. 6A).

  In addition to the above processing, the control unit 20 (see FIG. 2) counts the number of image sensors that are larger than the difference threshold, and sums the number of image sensors counted in each difference process to obtain the total number of elements. If the total number of elements is larger than the total element number threshold determined by the bottle type, it is determined that there is a defect. Thereby, defective glass bottles are automatically excluded outside the production line and separated.

FIG. 7 is an explanatory diagram showing an example of the inspection result of the defect of the mouth portion 11d.
In the image 41 in which the mouth portion 11d of the glass bottle 11 is photographed, the vertical axis represents the height position of the mouth portion 11d corresponding to each imaging element array, and the horizontal axis represents the circumferential position of the mouth portion 11d. Two vertical lines 42 and 43 in the image 41 indicate the inspection position in the circumferential direction of the mouth portion 11d.
Further, the amounts of received light according to the height position of the mouth portion 11d on the lines 42 and 43 are shown as data 47 and 48 in the graphs 45 and 46, respectively.
The horizontal axes of the graphs 45 and 46 represent the received light amount (output voltage) of each image sensor, and the vertical axis represents the height position of the mouth portion 11d corresponding to each image sensor array.

When the data 47 and the data 48 of the graphs 45 and 46 are compared, although the magnitude of the amount of received light varies depending on the difference in the thickness of the mouth portion 11d, the overall shape is substantially similar. As a big difference between the data 47 and the data 48, it can be confirmed that the received light amount is almost zero in the vicinity of the lower surface of the top surface 19c. In the data 47, it is not possible to confirm a portion where the amount of received light is zero.
When the amount of received light becomes zero, transmitted light does not reach the line sensor, so it can be determined that the opaque foreign matter 51 is present in the mouth portion 11d.
The amount of transmitted light received by the line sensor camera is always measured. If the amount of received light falls below a threshold value, it becomes difficult to detect a defect, so the control unit 20 (see FIG. 2). Controls to increase the amount of light emitted from the projector 21 (see FIG. 2).

  As shown in FIGS. 1, 2, and 3, the rotating mechanism 18 that rotates the glass bottle 11, the projector 21 that irradiates light to the mouth 11 d of the rotating glass bottle 11 from obliquely below, and the glass bottle A line sensor camera 22 for detecting light transmitted through the wall surface of the mouth portion 11d and detecting defects from the top surface 19c to the skirt 19b. It was made possible to detect by focusing on the entire longitudinal direction of the mouth portion 11d.

According to this configuration, by providing the tilt angle θ2, the wall surface of the mouth portion 11d is focused on the entire area in the vertical direction of the mouth portion 11d even when the wall surface of the mouth portion 11d is oblique to the optical axis of the lens 24. Therefore, the mouth portion 11d can be clearly photographed, and the inspection accuracy of the mouth portion 11d can be increased.
Further, as compared with the conventional case in which the camera is arranged away from the mouth portion 11d and a telephoto lens or the like is used in order to widen the focusing range, the line sensor camera 22 is provided at the mouth portion 11d in the present invention. Since it can arrange | position close, it becomes easy to confirm a test | inspection site | part, and since an observation range can be expanded, a test | inspection precision can be raised. Furthermore, the line sensor camera 22 is downsized, and thus the mouth inspection device 10 can be downsized.

Further, as shown in FIG. 2, since the line control film 23 is provided on the light projection surface 21a as the light emission surface of the light projector 21, the diffusion of the light emitted from the light projector 21 is limited, and the light is emitted from the mouth portion 11d. It can be directed in the direction of transmission through the wall. For this reason, the contrast of the image photographed by the line sensor camera 22 can be increased, and the defect of the mouth portion 11d can be easily detected.
Further, as shown in FIGS. 2 and 3, since the light from the projector 21 is irradiated to at least the region from the outer wall of the top surface 19c of the mouth portion 11d of the glass bottle 11 to the lower skirt 19e, the mouth portion 11d. This makes it possible to minimize the inspection range of defects that are likely to occur, and to increase inspection efficiency.

Further, since the light transmitted through the wall surface of the mouth part 11d of the glass bottle 11 is directly photographed by the line sensor camera 22 without entering the other part of the wall surface of the mouth part 11d, the wall surface of the mouth part 11d overlaps. Therefore, the captured image becomes clear and the inspection accuracy can be improved.
Further, the light amount of transmitted light photographed by the line sensor camera 22 is detected, and when the light amount decreases beyond a threshold value, the light amount of the projector 21 is increased, so that the mouth portion 11d of the glass bottle 11 is thick. Even if it is a dark color, the brightness of the image can be ensured, defects can be easily confirmed, and the inspection accuracy can be increased.

  Also, as shown in FIGS. 4 and 5A and 5B, the line sensor camera 22 (see FIG. 2) has the function of an area sensor camera, and in the captured image as the area sensor camera at the initial setting. Since a predetermined line 27 is selected and the image of the selected line 27 is processed during the inspection of the mouth portion 11d, the most suitable portion of the mouth portion 11d can be confirmed with an area sensor camera. By selecting the line sensor at the location, the inspection accuracy can be further improved and the usability can be improved.

The above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified and applied without departing from the gist of the present invention.
In the present embodiment, the mouth inspection device 10 is applied to the glass bottle 11. However, the present invention is not limited to this, and a container having a mouth, for example, a glass cup, a glass cup, a glass vase, and a plastic It may be applied to plastic bottles.

DESCRIPTION OF SYMBOLS 10 Glass bottle opening | mouth inspection apparatus 11 Glass bottle 11d Mouth 19b Skirt 19c Top surface 19e Under skirt 21 Floodlight 21a Light-projection surface (output surface)
22 Line sensor camera 23 Line control film 27 Line 37, 38, 51 Disadvantages (Opaque foreign matter)
θ2 tilt angle

Claims (6)

A rotation mechanism that rotates the glass bottle;
A projector that irradiates light from the lower side of the mouth of the rotating glass bottle;
A line sensor camera that detects light passing through the mouth wall of the glass bottle and detects defects from the top surface to the skirt, and the line sensor camera has a tilt angle, and the entire longitudinal direction of the mouth of the glass bottle. A mouth inspection device for a glass bottle, characterized in that it can be detected by focusing on the glass.   The glass bottle mouth inspection apparatus according to claim 1, further comprising a line control film on an emission surface of the projector.   The glass bottle mouth inspection apparatus according to claim 1 or 2, wherein the light from the projector is irradiated to at least a region extending from the top outer wall of the mouth of the glass bottle to the bottom of the skirt.   The mouth inspection of the glass bottle according to claim 3, wherein the light transmitted through the mouth wall surface of the glass bottle is directly photographed by the line sensor camera without entering the other mouth wall surface. apparatus.   5. The light quantity of the projector is increased when the light quantity of the transmitted light photographed by the line sensor camera is detected and the light quantity decreases beyond a threshold value. 6. The mouth inspection device for glass bottles as described in 1.   The line sensor camera has an area sensor camera function, selects a predetermined line in a captured image as an area sensor camera at the time of initial setting, and processes an image of the selected line during an inspection of a mouth portion. The glass bottle mouth inspection device according to any one of claims 1 to 5, wherein

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