JP2013130489A - Illumination device and inspection device of glass bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device for an inspection device capable of accurately detecting a foreign matter when a transparent or nearly transparent foreign matter is mixed in liquid filled in a glass bottle, and capable of accurately detecting a chip of a bottle mouth part of the glass bottle.SOLUTION: The illumination device is installed to the inspection device for inspecting whether or not there is a foreign matter in liquid e filled in a glass bottle 1 by arranging an illumination 3 and a camera 4 facing each other so as to hold the glass bottle 1 in an upright state, which is an inspection object, therebetween, and by providing a shading plate 5 for covering part of an illumination light emitting surface for emitting illumination light L from the illumination 3 arranged facing the camera 4 and covering a center part in a horizontal direction of the illumination light emitting surface by the shading plate 5, the liquid inside the glass bottle 1 is illuminated only by the illumination light L emitted from both sides of the illumination light emitting surface.

Description

  The present invention is to inspect the chip of the glass bottle and the lighting device for illuminating the glass bottle when inspecting that the foreign substance mixed in the liquid filled in the glass bottle is transparent. It is related with the illuminating device for illuminating a glass jar when doing.

  Transparent or nearly transparent foreign substances such as glass pieces and resin pieces may be mixed in soft drinks, alcoholic drinks, and nutritional drinks called drinks filled in glass bottles. In order to detect a transparent or nearly transparent foreign substance present in the liquid, a liquid foreign substance inspection apparatus has been conventionally used. A conventional in-liquid inspection system uses a camera installed under the bottom of the glass bottle to illuminate the glass bottle from the illumination provided on the side of the upright glass bottle and to allow light to enter the glass bottle. There is a type that images a glass bottle from the bottom side. In this case, a dark field illumination method is employed in which the illumination direction of the illumination light and the optical axis direction of the camera are different. Therefore, since the image captured by the camera is not directly incident from the background direction, the background is dim. Become an image. When there is a transparent or nearly transparent foreign substance in the glass bottle, the foreign substance is imaged brighter than the liquid part by changing the direction in which light is captured (or refracted) from the entrance pupil of the camera lens. . Therefore, in the image processing for foreign object detection, if there is a brighter part than the background in the image, it is detected as a foreign object.

There is also a detection method in which the illumination and the camera are placed facing each other across a glass cage and a linear polarization filter is used to prevent the illumination light from entering the camera by making the illumination light and the polarization direction of the camera different. is there. Also in this case, the dark field illumination method is used, the liquid portion in the glass bottle is dark, and the foreign matter that changes the polarization direction of the reflected light or transmitted light is imaged brightly. However, a foreign object that does not change the polarization direction is imaged as dark as the liquid portion, and thus is difficult to detect.
The reason for adopting the dark field illumination method in this way is that, in the bright field illumination method in which the illumination light irradiation direction and the optical axis direction of the CCD camera coincide with each other, the camera captures light that has passed through the foreign matter, This is because in the case of a foreign substance that is nearly transparent, the degree of attenuation of light while passing through the foreign substance is small, and sufficient contrast cannot be obtained between the background and the foreign substance.

Japanese Patent Laid-Open No. 11-125604 JP 2010-249827 A

For the reasons described above, the present inventors tried to obtain contrast by darkening the liquid portion and brightly illuminating the foreign matter by the dark field illumination method, and put the illumination light into the glass bottle from three directions. As such, it was not put to practical use.
1) Top face direction of the eyelid cap: The foreign matter could not be sufficiently shined.
2) Slightly oblique direction on the same side as the camera side: From a slightly oblique direction on the same side as the camera side capable of transporting the eyelids, the foreign matter detection range is extremely narrow due to the reflected light of the eyelid surface. In addition, in order to eliminate the reflected light from the surface of the ridge, a sufficient amount of light could not be obtained when a linear polarizing filter was used.
3) Saddle bottom direction: It was difficult to incorporate lighting in a turntable that picks up and rotates the sputum.

  As described above, in the dark field illumination method, there is a limit in detecting transparent or nearly transparent foreign matter in the liquid. Therefore, the present inventors have proposed that the illumination and the camera are arranged facing each other so as to sandwich the glass bottle. This is an attempt to detect a foreign substance in liquid that is transparent or nearly transparent by adopting a field illumination method. As a result, the lighting and camera are placed facing each other so that the glass bottle is sandwiched, and the liquid part is darkened by placing a light shielding plate on a part of the front of the lighting, as in the dark field lighting method. The inventors have found that the contrast can be obtained by brightly illuminating the foreign matter, and have led to the inventive idea. It has also been confirmed that the method using a light shielding plate is also effective for detecting chipping on the side surface of the mouth portion of the glass bottle.

  The present invention has been made in view of the above-described circumstances. When a transparent or nearly transparent foreign substance is mixed in a liquid filled in a glass bottle, the foreign substance can be accurately detected and the glass bottle bottle is An object of the present invention is to provide an illumination device for an inspection apparatus that can accurately detect chipping in the mouth.

  In order to achieve the above-mentioned object, the first aspect of the glass bottle lighting device of the present invention is arranged such that the lighting and the camera are opposed to each other so as to sandwich the upright glass bottle to be inspected. An illumination device installed in an inspection device that inspects whether there is a foreign substance in the filled liquid, wherein a part of an illumination light emitting surface that emits illumination light from an illumination arranged facing the camera A light shielding plate is provided, and the central portion in the horizontal direction of the illumination light emitting surface is covered with the light shielding plate, so that the liquid in the glass bottle is illuminated only with illumination light emitted from both sides of the illumination light emitting surface. It is characterized by that.

  According to the present invention, the light shielding plate is disposed in front of the illumination, and the central portion of the illumination light emitting surface is shielded by the light shielding plate. Therefore, only the illumination light from both sides of the illumination light emitting surface is incident on the glass bottle. When the illumination imaging system of the present invention is viewed from the vertical direction, when the illumination light from both sides of the illumination light emitting surface is refracted by the glass bottle and emitted from the camera side lamp surface, the emission direction of the illumination light is The direction is not captured by the entrance pupil of the lens. Therefore, the illumination light emitted from the illumination light emitting surface does not pass through the glass bottle and enter the camera, and the illumination device of the present invention functions as a dark field illumination system. Therefore, the image taken with the camera is an image with a dark liquid part. When there is a transparent foreign substance or a nearly transparent foreign substance (semi-transparent foreign substance) in the glass bottle, the foreign substance is imaged brighter than the liquid part by scattered light (or refracted light) scattered from the foreign substance.

According to a preferred aspect of the present invention, the illumination light emitted from both sides of the illumination light emitting surface is irradiated onto the glass bottle, and the illumination light is refracted by the glass bottle and the filled liquid and emitted from the camera side bottle surface. In this case, the emission direction of the illumination light is a direction that cannot be captured by the entrance pupil of the lens of the camera.
According to the present invention, the illumination light emitted from both sides of the illumination light emitting surface does not pass through the glass bottle and enter the camera, and the illumination device of the present invention functions as a dark field illumination system. Therefore, the image taken with the camera is an image with a dark liquid part.

  According to a preferred aspect of the present invention, the illumination light emitting surface has a rectangular shape, the light shielding plate has a rectangular shape, and the horizontal width of the light shielding plate is smaller than the horizontal width of the illumination light emitting surface. Features.

According to a preferred aspect of the present invention, the horizontal width of the light shielding plate is such that the illumination light emitted from the illumination light emitting surface does not directly enter the camera through the liquid in the glass bottle. , Set.
According to the present invention, the illumination light emitted from the illumination light-emitting surface transmits the liquid in the glass cage by adjusting the width of the light shielding plate in accordance with the range in which the dark field is desired and the distance between the glass bottle and the light shielding plate. So that it does not enter the camera directly.

  In another aspect of the glass bottle lighting device of the present invention, the illumination and the camera are arranged so as to sandwich the upright glass bottle to be inspected, and there is a foreign substance in the liquid filled in the glass bottle. The illumination device is installed in an inspection device for inspecting whether or not the illumination device arranged to face the camera is composed of two illumination devices arranged at intervals in the horizontal direction. It is made to oppose the center part of a glass bottle, The liquid in a glass bottle is illuminated only with the illumination light radiate | emitted from the illumination light emission surface of the said 2 illumination.

  According to the present invention, the illumination arranged facing the camera is composed of two illuminations arranged at intervals in the horizontal direction. Therefore, only the illumination light from the illumination light emitting surfaces of the two illuminations enters the glass bottle. When the illumination imaging system of the present invention is viewed from the vertical direction, when the illumination light from the illumination light emitting surfaces of the two illuminations is refracted by the glass bottle and emitted from the camera side lamp surface, the emission direction of the illumination light is The direction is not captured by the entrance pupil of the camera lens. Therefore, the illumination light emitted from the illumination light emitting surface does not pass through the glass bottle and enter the camera, and the illumination device of the present invention functions as a dark field illumination system. Therefore, the image taken with the camera is an image with a dark liquid part. When there is a transparent foreign substance or a nearly transparent foreign substance (semi-transparent foreign substance) in the glass bottle, the foreign substance is imaged brighter than the liquid part by scattered light (or refracted light) scattered from the foreign substance.

According to a preferred aspect of the present invention, the illumination light emitted from the illumination light emitting surfaces of the two illuminations is applied to the glass bottle, the illumination light is refracted by the glass bottle and the filled liquid, and the camera side bottle surface When emitted from the camera, the direction in which the illumination light is emitted is a direction that cannot be captured by the entrance pupil of the lens of the camera.
According to a preferred aspect of the present invention, the illumination light emitting surface has a rectangular shape.

  In the second embodiment of the glass bottle lighting device of the present invention, the lighting and the camera are arranged to face each other so as to sandwich the upright glass bottle to be inspected, and the glass bottle has a chip at its mouth. An illumination device installed in an inspection device for inspecting whether or not, provided with a light shielding plate that covers a part of an illumination light emitting surface that emits illumination light from illumination disposed opposite to the camera, By covering the central portion of the illumination light emitting surface in the horizontal direction, the mouth portion of the glass bottle is illuminated only with illumination light emitted from both sides of the illumination light emitting surface.

  According to the present invention, the light shielding plate is disposed in front of the illumination, and the central portion of the illumination light emitting surface is shielded by the light shielding plate. Therefore, only the illumination light from both sides of the illumination light emitting surface is incident on the glass bottle. When the illumination imaging system of the present invention is viewed from the vertical direction, when the illumination light from both sides of the illumination light emitting surface is refracted by the glass bottle and emitted from the camera side lamp surface, the emission direction of the illumination light is The direction is not captured by the entrance pupil of the lens. Therefore, the illumination light emitted from the illumination light emitting surface does not pass through the mouth portion of the glass bottle and enter the camera, and the illumination device of the present invention functions as a dark field illumination system. For this reason, the image taken by the camera is a dark image in the entire mouth portion. When there is a chip on the side surface of the mouth in the glass bottle, the chip on the side surface of the mouth is imaged brighter than the other parts by scattered light (or refracted light) scattered from the chip.

According to a preferred aspect of the present invention, when the illumination light emitted from both sides of the illumination light emitting surface is irradiated onto the glass bottle, the illumination light is refracted by the glass bottle and emitted from the camera side bottle surface, The emitting direction of the illumination light is a direction that cannot be captured by an entrance pupil of the lens of the camera.
According to the present invention, the illumination light emitted from both sides of the illumination light emitting surface does not pass through the mouth of the glass bottle and enter the camera, and the illumination device of the present invention functions as a dark field illumination system. It will be. For this reason, the image taken by the camera is a dark image in the entire mouth portion.

  According to a preferred aspect of the present invention, the illumination light emitting surface has a rectangular shape, the light shielding plate has a rectangular shape, and the horizontal width of the light shielding plate is smaller than the horizontal width of the illumination light emitting surface. Features.

According to a preferred aspect of the present invention, the horizontal width of the light shielding plate is such that the illumination light emitted from the illumination light emitting surface does not enter the camera directly through the mouth of the glass bottle. It is characterized in that it is set.
According to the present invention, the width of the light shielding plate is adjusted in accordance with the range where the dark field is desired and the distance between the glass bottle and the light shielding plate, so that the illumination light emitted from the illumination light emitting surface Do not transmit directly to the camera.

  In another aspect of the glass bottle lighting device of the present invention, the lighting and the camera are arranged to face each other so as to sandwich the upright glass bottle to be inspected. A lighting device installed in an inspection device for inspecting the lighting device, wherein the lighting device arranged opposite to the camera is composed of two lighting devices arranged in the horizontal direction with a space therebetween, and the space is set in a glass bottle. It is made to oppose to the center part of the opening part of this, and the opening part of the glass bottle is illuminated only with the illumination light radiate | emitted from the illumination light emission surface of said two illuminations.

  According to the present invention, the illumination arranged facing the camera is composed of two illuminations arranged at intervals in the horizontal direction. Therefore, only the illumination light from the illumination light emitting surfaces of the two illuminations enters the glass bottle. When the illumination imaging system of the present invention is viewed from the vertical direction, when the illumination light from the illumination light emitting surfaces of the two illuminations is refracted by the glass bottle and emitted from the camera side lamp surface, the emission direction of the illumination light is The direction is not captured by the entrance pupil of the camera lens. Therefore, the illumination light emitted from the illumination light emitting surface does not pass through the mouth portion of the glass bottle and enter the camera, and the illumination device of the present invention functions as a dark field illumination system. For this reason, the image taken by the camera is a dark image in the entire mouth portion. When there is a chip on the side surface of the mouth in the glass bottle, the chip on the side surface of the mouth is imaged brighter than the other parts by scattered light (or refracted light) scattered from the chip.

According to a preferred aspect of the present invention, when the illumination light emitted from the illumination light emitting surfaces of the two illuminations is irradiated onto the glass bottle, the illumination light is refracted by the glass bottle and emitted from the camera side bottle surface. In addition, the emission direction of the illumination light is a direction that cannot be captured by an entrance pupil of the lens of the camera.
According to a preferred aspect of the present invention, the illumination light emitting surface has a rectangular shape.

  An inspection apparatus for glass bottles according to the present invention includes the lighting apparatus for glass bottles according to any one of claims 1 to 14, and a camera disposed facing the illumination with the glass bottle to be inspected interposed therebetween. It is characterized by having.

According to a preferred aspect of the present invention, the image processing of the image obtained by the camera is performed by scanning the obtained image to determine whether there is a bright spot or region in the dark background. It is characterized by detecting a chip.
According to the present invention, the image processing only needs to scan the obtained image to determine whether there is a bright spot (or region) in the dark background, and the image processing is extremely easy. Become. In normal image processing, the contour of the inspection portion of the glass bottle is obtained, an inspection gate is set in the obtained contour, and it is determined whether or not there is an image portion corresponding to a foreign substance in the inspection gate. However, in the present invention, since it is only necessary to determine whether or not there is a bright spot (or region) in a dark background in the entire obtained image, the contour of the inspection part of the glass bottle is obtained. There is no need to set up an inspection gate.

The present invention has the following effects.
(1) When foreign matter is mixed in the liquid filled in the glass bottle, the contrast is obtained with the bright field illumination method because the foreign matter is transparent or nearly transparent in the past. In the method using the linear polarization filter for the illumination and the camera, the foreign matter could not be detected when the reflected light is a foreign matter that does not change the linear polarization direction. Since the foreign matter can be made brighter and the foreign matter can be brightly illuminated, an image having sufficient contrast between the foreign matter and the liquid portion can be obtained. Therefore, it is possible to accurately detect a transparent foreign substance or a nearly transparent foreign substance (semi-transparent foreign substance). In addition to foreign matter that is transparent or nearly transparent, for example, foreign matter that scatters light, such as fibers, has sufficient contrast and can be detected with high accuracy.
(2) When inspecting whether there is a chip in the mouth part of the glass bottle, it is not affected by the irregularities on the side of the mouth of the glass bottle, and the normal part without the chip is darkened and the part with the chip is made bright. It is possible to brighten even small chips that have been difficult to detect in the past. Therefore, it is possible to detect the chipping on the side surface of the mouth with high accuracy and simplify the logic for detecting the chipping on the side surface of the mouth.

FIG. 1 is a front view showing a first aspect of an inspection apparatus provided with the glass bottle illumination device of the present invention. FIG. 2 is a front view of illumination. FIG. 3 is a schematic diagram for explaining the operation of the glass bottle inspection apparatus configured as shown in FIGS. 1 and 2. FIG. 4 is an image taken by the illumination imaging system shown in FIGS. 3 (a) and 3 (b). FIG. 5: is a front view which shows the 2nd aspect of the test | inspection apparatus provided with the illuminating device of the glass fountain concerning this invention. FIG. 6 is a front view of illumination. FIG. 7 is a schematic diagram for explaining the operation of the glass bottle inspection apparatus configured as shown in FIGS. 5 and 6. FIG. 8 is an image taken by the illumination imaging system shown in FIGS. 7 (a) and 7 (b).

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a glass bottle lighting device and an inspection device according to the present invention will be described below with reference to FIGS. 1 to 8, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted.
FIG. 1 is a front view showing a first aspect of an inspection apparatus provided with the glass bottle illumination device of the present invention. As shown in FIG. 1, the glass bottle 1 is filled with the liquid e. In FIG. 1, the glass bottle 1 is shown as an example of a transparent vial bottle. The glass bottle 1 is placed on the turntable 2 in an upright state, and the glass bottle 1 is rotatable around its axis 1x. On the side of the glass bottle 1, the illumination 3 and the CCD camera 4 are arranged to face each other so as to sandwich the glass bottle 1. The illumination 3 is a rectangular flat illumination, and is arranged close to the glass bottle 1. The optical axis 4x of the CCD camera 4 extends in the horizontal direction and extends to a height position between the liquid level es in the glass bottle 1 and the bottom of the bottle. The CCD camera 4 is connected to an image processing device (not shown).

  FIG. 2 is a front view of the illumination 3. That is, FIG. 2 is a view of the illumination 3 as viewed from the direction of the CCD camera 4. As shown in FIG. 2, the illumination light emitting surface 3 a has a rectangular shape, the longitudinal direction of the illumination light emitting surface 3 a coincides with the height direction of the glass bowl 1, and the width direction of the illumination light emitting surface 3 a is the casing of the glass bowl 1. It corresponds to the diameter direction. A light shielding plate 5 is disposed in front of the illumination light emitting surface 3 a of the illumination 3. The width W2 of the light shielding plate 5 is set smaller than the width W1 of the illumination light emitting surface 3a. Therefore, in the horizontal direction of the illumination light emitting surface 3a, the central portion of the illumination light emitting surface 3a is shielded by the light shielding plate 5, and both side portions of the illumination light emitting surface 3a are exposed without being shielded by the light shielding plate 5. The width W2 of the light shielding plate 5 can be adjusted (described later). The vertical height of the illumination light emitting surface 3a and the light shielding plate 5 is set so that there is at least a height from the bottom of the glass bottle 1 to the liquid level es of the liquid e in the glass bottle.

Next, the operation of the glass bottle inspection apparatus constructed as shown in FIGS. 1 and 2 will be described with reference to FIG.
FIG. 3A is a diagram in which an optical path is added to the illumination imaging system shown in FIG. As shown in FIG. 3A, the illumination light L from the illumination light emitting surface 3a of the illumination 3 enters the glass bottle 1 and transmits the liquid e. In FIG. 3 (a), it is illustrated as a bright field illumination system in which the direction of the illumination light L and the optical axis 4x of the camera 4 are matched, but as described in FIG. Is provided with a light shielding plate 5, and the central portion of the illumination light emitting surface 3 a is shielded by the light shielding plate 5. Therefore, only the illumination light from both sides of the illumination light emitting surface 3a is incident on the glass bottle 1.

  FIG. 3B is a view of the illumination imaging system shown in FIG. 3A as viewed from above, and is a view taken in the direction of arrow III in FIG. As shown in FIG. 3 (b), the illumination light L from both sides of the illumination light emitting surface 3a is inclined with respect to the optical axis 4x of the CCD camera 4, enters the glass bottle 1 from an oblique direction, and the liquid e And travels in an oblique direction. In FIG.3 (b), the illumination light from one side of the illumination light emission surface 3a is shown, and a part of the optical path of illumination light is shown by L1, L2, L3, and L4. Hereinafter, the illumination lights L1 to L4 will be collectively referred to as illumination light L. That is, when the illumination imaging system of the present invention is viewed from the vertical direction, the illumination light L emitted from the illumination light emitting surface 3a is refracted by the glass bottle 1 and the filled liquid e and emitted from the camera side bottle surface. Furthermore, the emission direction of the illumination light L is a direction that cannot be captured by the entrance pupil of the lens of the CCD camera 4. Therefore, the illumination light L emitted from the illumination light emitting surface 3a does not pass through the glass bottle 1 and enter the CCD camera 4, and the illumination device of the present invention functions as a dark field illumination system. Therefore, the image taken by the CCD camera 4 is an image with a dark liquid part. When there is a transparent foreign substance or a nearly transparent foreign substance (semi-transparent foreign substance) in the glass bottle 1, the foreign substance is imaged brighter than the liquid part by scattered light (or refracted light) scattered therefrom. Therefore, in the image processing apparatus, if there is a brighter part than the background in the image, it can be detected as a foreign object.

The width W2 of the light shielding plate 5 is adjusted in accordance with the range desired to be a dark field and the distance D between the glass bottle 1 and the light shielding plate 5 (see FIG. 1). That is, the width W2 of the light shielding plate 5 is adjusted so that the liquid portion in the glass bottle 1 is darkly imaged by the CCD camera 4.
In the embodiment shown in FIG. 1 to FIG. 3, the central portion of the illumination light emitting surface 3 a of the illumination 3 is shielded by the light shielding plate 5. However, the illumination 3 is separated into two pieces arranged at intervals in the horizontal direction. You may comprise by illumination. In this case, the interval corresponds to the light shielding plate and performs the same function as the light shielding plate.

  FIG. 4 is an image taken by the illumination imaging system shown in FIGS. 3 (a) and 3 (b). A plurality of translucent resins having a diameter of 50 μm are mixed in the liquid of the glass bottle 1 in advance. In FIG. 4, reference numeral 1 is an image portion corresponding to the liquid surface, and reference numeral 2 is an image portion corresponding to the bottom. As shown in FIG. 4, in the image, small white dots (indicated by arrows) can be clearly recognized in a dark background. The image on the lower left side of FIG. 4 is an image in which the location of the arrow is enlarged. In the image, white dots can be clearly recognized in some places other than the part indicated by the arrow. In this way, white dots appear clearly in a dark background, so image processing scans the resulting image to determine whether there are bright spots (or areas) in the dark background. All that is required is to make image processing extremely easy. In normal image processing, the contour of the inspection portion of the glass bottle is obtained, an inspection gate is set in the obtained contour, and it is determined whether or not there is an image portion corresponding to a foreign substance in the inspection gate. However, in the present invention, since it is only necessary to determine whether or not there is a bright spot (or region) in a dark background in the entire obtained image, the contour of the inspection part of the glass bottle is obtained. There is no need to set up an inspection gate.

  FIG. 5: is a front view which shows the 2nd aspect of the test | inspection apparatus provided with the illuminating device of the glass fountain concerning this invention. As shown in FIG. 5, the glass bottle 1 is placed on the turntable 2 in an upright state, and the glass bottle 1 is rotatable around its axis 1x. On the side of the mouth 1m of the glass bottle 1, an illumination 3 and a CCD camera 4 are arranged opposite to each other so as to sandwich the glass bottle 1. In FIG. 5, the glass bottle 1 shows an example of a transparent screw mouth hook. The illumination 3 is a rectangular block-shaped illumination, and is disposed in the vicinity of the glass bottle 1. The optical axis 4x of the CCD camera 4 extends in the horizontal direction and extends to the position of the screw opening.

  FIG. 6 is a front view of the illumination 3. That is, FIG. 6 is a view of the illumination 3 viewed from the direction of the CCD camera 4. As shown in FIG. 6, the illumination light emitting surface 3a has a rectangular shape, the vertical direction of the illumination light emitting surface 3a coincides with the height direction of the mouth portion of the glass bottle 1, and the width direction of the illumination light emitting surface 3a is the glass bottle. 1 coincides with the diameter direction of the throat portion. A light shielding plate 5 is disposed in front of the illumination light emitting surface 3 a of the illumination 3. The width W2 of the light shielding plate 5 is set smaller than the width W1 of the illumination light emitting surface 3a. Therefore, in the horizontal direction of the illumination light emitting surface 3a, the central portion of the illumination light emitting surface 3a is shielded by the light shielding plate 5, and both side portions of the illumination light emitting surface 3a are exposed without being shielded by the light shielding plate 5. The width W2 of the light shielding plate 5 can be adjusted (described later). The vertical heights of the illumination light emitting surface 3a and the light shielding plate 5 are set so that there is at least the height of the mouth portion 1m of the glass bottle 1.

Next, the operation of the glass bottle inspection apparatus constructed as shown in FIGS. 5 and 6 will be described with reference to FIG.
FIG. 7A is a diagram in which an optical path is added to the illumination imaging system shown in FIG. As shown to Fig.7 (a), the illumination light L from the illumination light emission surface 3a of the illumination 3 injects into the glazing part 1m of the glass jar 1, and permeate | transmits the glazing part 1m. In FIG. 7A, the illumination light L direction and the optical axis 4x of the camera 4 are shown in the same manner as in the bright field illumination system, but as described in FIG. Is provided with a light shielding plate 5, and the central portion of the illumination light emitting surface 3 a is shielded by the light shielding plate 5. Therefore, only the illumination light from both sides of the illumination light emitting surface 3a is incident on the opening 1m of the glass bottle 1.

  FIG. 7B is a view of the illumination imaging system shown in FIG. 7A as viewed from above, and is a view taken along arrow VII in FIG. As shown in FIG. 7B, the illumination light L from both sides of the illumination light emitting surface 3a is tilted with respect to the optical axis 4x of the CCD camera 4, and obliquely enters the mouth 1m of the glass bottle 1 from an oblique direction. Incident light passes through the mouth 1m and travels in an oblique direction. That is, when the illumination imaging system of the present invention is viewed from the vertical direction, the illumination light L emitted from the illumination light emitting surface 3a is refracted by the glass bottle 1 and emitted from the camera side mouth part surface. The emission direction of L is a direction that cannot be captured by the entrance pupil of the lens of the CCD camera 4. Therefore, the illumination light L emitted from the illumination light emitting surface 3a does not pass through the mouth 1m of the glass bottle 1 and enter the CCD camera 4, and the illumination device of the present invention functions as a dark field illumination system. become. For this reason, the image taken by the CCD camera 4 is a dark image in the entire mouth portion 1m. When there is a chip on the side surface of the mouth portion in the glass bottle 1, the chip on the side surface of the mouth is imaged brighter than other portions by scattered light (or refracted light) scattered therefrom. Therefore, in the image processing apparatus, if there is a brighter part than the background in the image, it can be detected as a lack of the mouth side surface.

The width W2 of the light shielding plate 5 is adjusted according to the range desired to be a dark field and the distance D (see FIG. 5) between the glass bottle 1 and the light shielding plate 5. That is, the width W2 of the light shielding plate 5 is adjusted so that the entire mouth 1m of the glass bottle 1 is darkly imaged by the CCD camera 4.
In the embodiment shown in FIG. 5 to FIG. 7, the central portion of the illumination light emitting surface 3 a of the illumination 3 is shielded by the light shielding plate 5. However, the illumination 3 is separated into two pieces arranged at intervals in the horizontal direction. You may comprise by illumination. In this case, the interval corresponds to the light shielding plate and performs the same function as the light shielding plate.

  FIG. 8 is an image taken by the illumination imaging system shown in FIGS. 7 (a) and 7 (b). In FIG. 8, the left image is an original image taken by the CCD camera 4, the center image is a gamma corrected image obtained by performing gamma correction on the original image to improve the visibility, and the right image is a gamma corrected image. It is a binary image obtained from the corrected image. In the figure, an arrow indicated by reference numeral 1 indicates a chip (defect) that can be recognized as a white point in a dark background. Moreover, the arrow shown by the code | symbol 2 shows the upper end of the side of a throat, and the arrow shown by the code | symbol 3 has shown the lower end of the shed side. As shown in FIG. 8, in the image, a small white area (indicated by arrow 1) can be clearly recognized in a dark background. As described above, since the white area clearly appears in the dark background, the image processing scans the obtained image, and there is a bright area (or dot) in the dark background. Image processing is extremely easy.

Before conceiving the illumination method using the light-shielding plate of the present invention, the present inventors used the bright field illumination method in which the illumination and the camera are arranged opposite to each other with the glass bottle's mouth part interposed therebetween. Attempts were made to detect the changes in the light and darkness in the horizontal direction as chipping on the side of the mouth by imaging the transmitted light from the top. As a result, although the stripes in the lateral direction are formed by unevenness on the side surface of the mouth, in the case of a large chip, the contrast in the horizontal direction could be detected as a chip, but it was difficult to detect a small chip.
However, according to the illumination system using the light-shielding plate of the present invention, as shown in FIG. 8, even if there is a small chip, the chipped portion shines brightly and an image with sufficient contrast with the background can be obtained. Therefore, small chips on the side surface of the mouth can be detected with high accuracy.

  Although the embodiment of the present invention has been described so far, the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention may be implemented in various different forms within the scope of the technical idea.

1 Glass bowl 1
1m Mouth part 1x Axis 2 Turntable 3 Illumination 3a Illumination light emitting surface 4 CCD camera 4x Optical axis 5 Shading plate e Liquid es Liquid surface

Claims (16)

A lighting device installed in an inspection device that inspects whether or not there is a foreign substance in the liquid filled in the glass bottle by arranging the lighting and the camera so as to sandwich the upright glass bottle to be inspected Because
Provide a light shielding plate that covers a part of the illumination light emitting surface that emits illumination light from the illumination arranged facing the camera,
By covering the central portion of the illumination light emitting surface in the horizontal direction with the light shielding plate, the liquid in the glass bottle is illuminated only with illumination light emitted from both sides of the illumination light emitting surface. Glass fence lighting device.   The illumination light emitted from both sides of the illumination light emitting surface is irradiated onto the glass bottle, and when the illumination light is refracted by the glass bottle and the filled liquid and emitted from the camera side bottle surface, the illumination light 2. The illumination device for a glass bottle according to claim 1, wherein the emission direction is a direction not captured by an entrance pupil of the lens of the camera.   3. The illumination light emitting surface has a rectangular shape, the light shielding plate has a rectangular shape, and a horizontal width of the light shielding plate is smaller than a horizontal width of the illumination light emitting surface. Glass fence lighting device.   The horizontal width of the light shielding plate is set so that the illumination light emitted from the illumination light emitting surface does not directly enter the camera through the liquid in the glass bottle. Item 4. A lighting device for glass bottles according to any one of Items 1 to 3. A lighting device installed in an inspection device that inspects whether or not there is a foreign substance in the liquid filled in the glass bottle by arranging the lighting and the camera so as to sandwich the upright glass bottle to be inspected Because
The illumination arranged facing the camera is composed of two illuminations arranged at intervals in the horizontal direction, and the interval is opposed to the central part of the glass bottle,
An apparatus for illuminating a glass bottle, wherein the liquid in the glass bottle is illuminated only with illumination light emitted from the illumination light emitting surfaces of the two lights.   When the illumination light emitted from the illumination light emitting surfaces of the two illuminations is applied to the glass bottle, the illumination light is refracted by the glass bottle and the filled liquid and emitted from the camera side bottle surface. 6. The glass lamp illumination device according to claim 5, wherein the light is emitted in a direction not captured by an entrance pupil of the lens of the camera.   The glass illuminator according to claim 5 or 6, wherein the illumination light emitting surface has a rectangular shape. It is an illuminating device that is installed in an inspection device that inspects whether there is a chip in the mouth of the glass jar, with the lighting and camera facing each other so as to sandwich the upright glass jar that is the object of inspection. And
Provide a light shielding plate that covers a part of the illumination light emitting surface that emits illumination light from the illumination arranged facing the camera,
By covering the central portion of the illumination light emitting surface in the horizontal direction with the light shielding plate, the mouth portion of the glass bottle is illuminated only with illumination light emitted from both sides of the illumination light emitting surface. Glass fence lighting device.   When the illumination light emitted from both sides of the illumination light emitting surface is irradiated on the glass bottle, and the illumination light is refracted by the glass bottle and emitted from the camera side bottle surface, the emission direction of the illumination light is the camera. 9. The illumination device for a glass jar according to claim 8, wherein the illumination device is in a direction not captured by the entrance pupil of the lens.   10. The illumination light emitting surface has a rectangular shape, the light shielding plate has a rectangular shape, and the horizontal width of the light shielding plate is smaller than the horizontal width of the illumination light emitting surface. Glass fence lighting device.   The horizontal width of the light shielding plate is set so that the illumination light emitted from the illumination light emitting surface does not pass through the mouth of the glass bottle and enter the camera directly. The lighting device for a glass bottle according to any one of claims 8 to 10. It is an illuminating device that is installed in an inspection device that inspects whether there is a chip in the mouth of the glass jar, with the lighting and camera facing each other so as to sandwich the upright glass jar that is the object of inspection And
The illumination arranged facing the camera is composed of two illuminations arranged at intervals in the horizontal direction, and the interval is opposed to the central part of the mouth portion of the glass bottle,
An apparatus for illuminating a glass jar, wherein only the illumination light emitted from the illumination light emitting surfaces of the two illuminations is used to illuminate a jar portion of the glass jar.   When the illumination light emitted from the illumination light emitting surfaces of the two illuminations is applied to the glass bottle, the illumination light is refracted by the glass bottle and emitted from the camera side bottle surface, the emission direction of the illumination light is The illumination device for a glass jar according to claim 12, wherein the illumination device is in a direction not captured by an entrance pupil of the lens of the camera.   14. The lighting device for glass bottles according to claim 12, wherein the illumination light emitting surface has a rectangular shape. A lighting device for a glass bottle according to any one of claims 1 to 14,
An inspection apparatus for glass bottles, comprising: a camera arranged opposite to the illumination with a glass bottle to be inspected interposed therebetween.   The image processing of the image obtained by the camera is characterized by detecting a foreign object or a chip by scanning the obtained image and determining whether or not there is a bright spot or region in a dark background. The glass bottle inspection apparatus according to claim 15.

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