WO2018158824A1 - 容器の検査装置及び容器の検査方法 - Google Patents
容器の検査装置及び容器の検査方法 Download PDFInfo
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- WO2018158824A1 WO2018158824A1 PCT/JP2017/007814 JP2017007814W WO2018158824A1 WO 2018158824 A1 WO2018158824 A1 WO 2018158824A1 JP 2017007814 W JP2017007814 W JP 2017007814W WO 2018158824 A1 WO2018158824 A1 WO 2018158824A1
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- light
- container
- unit
- light emitting
- vertical direction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
Definitions
- the present invention relates to a container inspection apparatus and a container inspection method.
- Patent Document 1 There is an inspection method previously proposed by the present applicant as a method for detecting thin bubbles that occur extremely rarely on the inner surface of a container, particularly a glass bottle.
- Thin bubbles are generated on the inner surface of the glass bottle, and are formed by a very shallow depression on the inner surface and a thin glass film covering the depression.
- a striped filter in which a plurality of horizontally long slits are provided in multiple stages at regular intervals on the opaque plate is used to transmit light only at the slits and pass through the thin bubbles.
- the image is taken as an image in which the width of light and darkness is vertically compressed by the light.
- Patent Document 2 an inspection device that detects defects such as wrinkles in glass bottles using a light control film
- An object of the present invention is to provide a container inspection apparatus and inspection method that can inspect the presence or absence of defects such as thin bubbles with unclear outlines.
- the present invention has been made to solve at least a part of the above-described problems, and can be realized as the following aspects or application examples.
- the container inspection apparatus is A light emitting unit having a light emitting surface for irradiating light to the container; An imaging unit disposed opposite to the light emitting unit across a container; A determination unit that determines the presence or absence of defects based on the image of the container imaged by the imaging unit; A light limiting portion disposed on the container side of the light emitting portion; Including The light restricting portion includes a light transmitting portion and a light reducing portion extending in a horizontal direction along the light emitting surface, The light transmission part and the light reduction part are alternately arranged in the vertical direction, The light transmission part transmits the light emitted from the light emitting part to the container side, The dimming unit includes a plurality of blinds extending in the horizontal direction in the vertical direction, and restricts an incident angle of light with respect to the vertical direction among lights emitted from the light emitting unit.
- the presence or absence of a defect such as a thin bubble with an unclear outline can be inspected by a change in luminance in the vertical direction of the container surface by the light transmitting part and the light reducing part.
- the dimming part may be disposed on a light emitting surface of the light emitting part, and a height from the light emitting surface may be 0 mm to 100 mm.
- the vertical width of the light transmission part may be 3 mm to 6 mm.
- the dimming part can be formed by stacking a plurality of light control films.
- the light restricting portion is a first light restricting portion disposed at a position corresponding to a region below a predetermined height position in the vertical direction of the container, A second light limiting unit that reduces a transmission amount of light emitted from the light emitting unit at a position corresponding to a region above the predetermined height position on the container side of the light emitting unit;
- the second light limiting unit may be disposed with a predetermined interval in the horizontal direction.
- the determination unit recognizes at least one detection body from the captured image, and sets a vertical inspection area extending in the vertical direction and a horizontal inspection area extending in the horizontal direction within a predetermined range including the recognized detection body. When two or more detection bodies are included in the vertical inspection area and the horizontal inspection area, it can be determined as a defect.
- the determination unit recognizes at least one detection body from the captured image, and when the shape of the recognized detection body is a detection body connected in an annular shape or an arc-shaped detection body, the determination unit has a defect based on an area related to the detection body. Can be determined.
- a detection object having an annular contour or a detection object having an arc-shaped contour can also be determined as a defect.
- the determination unit recognizes at least one detection object from a captured image, and determines that the defect is a defect when a predetermined range including the recognized detection object includes a portion having a brightness equal to or higher than a predetermined threshold value. can do.
- a detection object including a place where the outline is bright and a place where the outline is dark can be determined as a defect.
- the container inspection method according to this application example is: Light emitted from the light emitting unit and light that has passed through a dimming unit that restricts the incident angle of light from the light emitting unit with respect to the vertical direction by a blind extending in the horizontal direction are alternately placed in the container in the vertical direction. Irradiate Taking an image of the container with an imaging unit arranged facing the light emitting unit across the container, It is characterized by determining the bubble on the inner surface of the container as a defect.
- the presence or absence of a defect such as a thin bubble with an unclear outline can be inspected by a change in luminance in the vertical direction of the container surface by the light transmitting part and the light reducing part.
- the present invention can provide a container inspection apparatus and inspection method that can inspect the presence or absence of defects such as thin bubbles with unclear outlines.
- FIG. 1 is a side view of a container inspection apparatus.
- FIG. 2 is a front view of the light emitting unit, the first light limiting unit, and the second light limiting unit.
- FIG. 3 is a diagram showing the container and its image side by side.
- FIG. 4 is an enlarged cross-sectional view of a thin bubble.
- FIG. 5 is an enlarged view of A in FIG.
- FIG. 6 is a diagram for explaining an aspect of the outline of a thin bubble in a captured image.
- FIG. 7 is a diagram illustrating the inspection mode in the determination unit.
- FIG. 8 is a flowchart of the container inspection method.
- the container inspection apparatus images a light emitting unit having a light emitting surface that irradiates light to the container, an imaging unit arranged to face the light emitting unit across the container, and the imaging unit.
- a determination unit configured to determine the presence or absence of a defect based on an image of the container, and a light limiting unit disposed on the container side of the light emitting unit, wherein the light limiting unit extends in a horizontal direction along the light emitting surface.
- the dimming unit includes a plurality of blinds extending in the horizontal direction in the vertical direction, and restricts an incident angle of light with respect to the vertical direction among light emitted from the light emitting unit. .
- FIG. 1 is a side view of the inspection apparatus 1 (hereinafter referred to as “inspection apparatus 1”) of the container 10
- FIG. 2 is a front view of the light emitting unit 20, the first light limiting unit 24, and the second light limiting unit 26.
- FIG. 3 shows the container and its image side by side.
- the inspection apparatus 1 includes a light emitting unit 20 having a light emitting surface 22 that irradiates light to the container 10, and an imaging unit disposed to face the light emitting unit 20 with the container 10 interposed therebetween. 40, a determination unit 52 that determines the presence / absence of a defect based on an image 80 (FIG. 3) of the container 10 captured by the imaging unit 40, and a first light limiting unit 24 disposed on the container 10 side of the light emitting unit 20 ,including.
- the first light limiting unit 24 is disposed at a position corresponding to the region 13a below the predetermined height position H1 (FIG. 3) in the vertical direction Y of the container 10.
- the inspection apparatus 1 can further include a second light restriction unit 26.
- the second light restricting portion 26 is disposed on the container 10 side of the light emitting portion 20 and at a position corresponding to the region 13b above the predetermined height position H1.
- Different optical systems are divided between the lower region 13a of the container where defects such as thin bubbles with unclear outlines are likely to occur and the upper region 13b where such defects are unlikely to occur.
- the first light limiting unit 24 may be arranged corresponding to the entire container 10. In addition, a fault is mentioned later.
- the container 10 is inspected in an upright state, that is, in a state where the axis 12 is along the vertical direction Y.
- the vertical direction Y is the direction of gravity
- the horizontal direction X is a direction orthogonal to the vertical direction Y.
- the inspection apparatus 1 includes a rotation support unit 30 that supports the container 10 while rotating the container 10 around the axis 12, and a side roller 32 that rotates the container 10 while contacting the side surface of the container 10.
- the side roller 32 is shown as being between the container 10 and the imaging unit 40, but for convenience of explanation of the side roller 32, the side roller 32 is used for the container 10 in the imaging unit 40. It is placed at a position that does not hinder shooting.
- the container 10 is a glass bottle and is transparent or translucent. Semi-transparency is a degree of transparency that allows the defect of the inner surface 15 of the container 10 to be determined by light from the light emitting unit 20 that has passed through the container 10.
- the container 10 has a circular cross section, for example.
- the cross-sectional shape of the container 10 may be a polygon.
- the predetermined height position H1 varies depending on the type of the container 10 and the state of molding.
- the predetermined height position H1 may be a so-called settle line.
- the settle line is a portion where the thickness changes at the boundary between the portion that is in contact with the mold and the portion that is not in contact by the settling blow for forming the mouth.
- the settle line can be in the horizontal direction X of the container 10.
- the predetermined height position H1 can be set at the boundary between the lower region 13a of the container 10 where the thin bubbles 18 are likely to be generated and the upper region 13b of the container 10 where the thin bubbles 18 are less likely to be generated.
- the inspection apparatus 1 captures the body portion 13 of the container 10 with the imaging unit 40 using the light transmitted through the container 10, and detects a darker part of the imaged image 80 (FIG. 3) as a detection body in the container 10. This is a light transmission type inspection apparatus 1.
- FIG. 4 is an enlarged cross-sectional view of the thin bubble 18.
- the amount of transmitted light is indicated by the thickness of the arrow.
- an image 80 is obtained.
- the seam 16, the thin bubbles 18, and the meat unevenness 19 can be confirmed as detection bodies.
- the joint 16 is not a defect, and a step of the joint of the mold for forming the container 10 appears in the image 80 as a dark line along the vertical direction Y.
- the thin bubble 18 is a defect that rarely occurs at a position below the predetermined height position H1 of the container 10.
- the meat unevenness 19 is not a defect but a dark portion that appears due to a change in the thickness of the body portion 13 of the container 10.
- there are also defects such as burns.
- the thin bubbles 18 may be generated on the inner surface 15 of the container 10 below the predetermined height position H1 of the container 10.
- the thin bubbles 18 are generated due to the difference in easiness of elongation due to the temperature difference of the parison in the molding process of the container 10.
- the thin bubble 18 is a hollow bubble having a very shallow concave portion (for example, a depth of 100 ⁇ m or less from the inner surface 15), and has a substantially circular outline. Therefore, although the outline of the thin bubble 18 appears slightly darker than the surroundings in the image 80, it is usually difficult to discriminate because the brightness is the same as that of the joint 16 and the meat unevenness 19.
- the inspection apparatus 1 must be able to discriminate between the thin bubbles 18 and portions that are not defective such as the joint 16 and the meat unevenness 19.
- Light Emitting Unit The light emitting unit 20 will be described with reference to FIGS.
- the light emitting unit 20 is a light source that illuminates the container 10.
- the light emitting unit 20 has a light emitting surface 22 on the container 10 side, and is a surface light source that can illuminate the container 10 from the opposite side of the imaging unit 40.
- the light emitting unit 20 is set to a size that can illuminate the entire largest container 10 that is scheduled to be inspected by the inspection apparatus 1.
- the light emitting unit 20 has a light emitting surface 22 on the container 10 side having a rectangular shape, and almost the entire surface emits light.
- the light emitting unit 20 faces the container 10 and the imaging unit 40 and is arranged so that light transmitted through the container 10 reaches the imaging unit 40.
- the light source of the light emitting unit 20 a known light source such as an LED or an organic EL can be used.
- the light emitting unit 20 is diffused illumination.
- the container 10 can be irradiated with uniform light using a diffusion plate on the front surface (light emitting surface 22) of the light source.
- a diffusion plate a known plate that diffuses light from a light source such as an LED and emits the light to the outside can be used. When light is diffused by the diffusion plate, unevenness with a portion where no light source exists can be reduced when a large number of light sources are used.
- a light limiting part is provided on the light emitting surface 22.
- FIG. 5 is an enlarged view of A in FIG.
- limiting part 24 is a position corresponding to the area
- the first light restriction unit 24 includes a light transmission unit 244 and a light reduction unit 242 that extend in the horizontal direction X along the light emitting surface 22.
- the first light restricting unit 24 alternately arranges the light transmitting units 244 and the light reducing units 242 in the vertical direction Y. This is because the first light restricting section 24 transmits the light emitted from the light emitting surface 22 in the horizontal direction X toward the container 10 and transmits the light emitted and diffused in the vertical direction Y to restrict the light emitted.
- the light transmission unit 244 transmits the light emitted from the light emitting unit 20.
- the light transmission part 244 is a slit.
- the light transmitting portion 244 has nothing to block the light from the light emitting surface 22. In order to erase the shadow of the joint 16, the container 10 can be illuminated with sufficient horizontal light that has passed through the light transmitting portion 244.
- the dimming unit 242 includes a plurality of blinds 243 extending in the horizontal direction X in the vertical direction Y, and the incident angle of light with respect to the vertical direction Y among the light emitted from the light emitting unit 20.
- the blind 243 is formed so as to extend in the horizontal direction X and the thickness direction of the dimming part 242.
- the light reducing unit 242 transmits light along the blind 243 with priority. Therefore, the diffused light on the light emitting surface 22 is narrowed by the light reducing unit 242 and restricts transmission of light that is diffused in the vertical direction Y in particular.
- the blind 243 extends, for example, in a direction orthogonal to the light emitting surface 22. Accordingly, the dimming unit 242 preferentially transmits the light in the horizontal direction X emitted from the light emitting surface 22.
- the change in luminance in the vertical direction Y of the inner surface 15 of the container 10 by the light transmitting portion 244 and the light reducing portion 242 is a striped pattern having a gradual luminance change as shown in the image 80 of FIG. appear. Due to the change in luminance in the vertical direction Y, defects such as the thin bubble 18 with an unclear outline can be confirmed in the image 80, and the presence or absence of the defect can be determined in the inspection apparatus 1.
- the dark seam 16 generated by the horizontal step in the image 80 is obtained. Is less likely to appear (change in luminance is reduced). Even if the unevenness 19 appears as a change in the thickness in the horizontal direction, it becomes difficult to appear as a dark part in the image 80 (change in luminance becomes small).
- the light reducing unit 242 is disposed on the light emitting surface 22 of the light emitting unit 20, and the height from the light emitting surface 22 is 0 mm to 100 mm. Since the dimming unit 242 has a predetermined thickness, the shadow of the seam 16 can be suppressed and the shadow of a defect such as the thin bubble 18 with an unclear outline can be emphasized in the captured image 80. it can. The height of the dimming part 242 from the light emitting surface 22 can be further 0 mm to 100 mm.
- the light reduction part 242 is formed by stacking a plurality of light control films. By emphasizing the intensity of light in the vertical direction Y of the inner surface 15 of the container 10, it is possible to emphasize the outline of a defect such as a thin bubble 18 with an unclear outline.
- FIG. 5 shows an example in which two light control films having a thickness of 0.5 mm are stacked and bonded in the thickness direction.
- a commercially available light control film can be used.
- “LIGHT CON FILM 60 DEG 12 ⁇ 11” manufactured by 3M may be employed.
- the width of the light transmission part 244 in the vertical direction Y can be 3 mm to 6 mm.
- the width was suitable for recognizing the shadow of the outline of a defect such as thin bubbles 18 with unclear outline.
- a portion corresponding to the lower region 13 a in the image 80 is subjected to a difference process in the horizontal direction X and a difference process in the vertical direction Y, whereby a stripe pattern by the light reduction unit 242 and the light transmission unit 244 is formed.
- the dark portion of the seam 16 and the meat unevenness 19 can be removed, and the shadow of the outline of the thin bubble 18 can be left.
- the first light limiting unit 24 is a dimming unit by providing a plurality of (three in FIG. 2) slits at a predetermined interval on a thin sheet obtained by bonding two light control films. 242 and light transmission portions 244 are alternately provided.
- the first light restricting portion 24 is provided with elongated holes 246 extending in the vertical direction Y at both ends in the width direction (horizontal direction X), and is fixed to the light emitting portion 20 by bolts 28.
- the first light restricting portion 24 is movable in the vertical direction Y along the long hole 246 and can be adjusted in position according to the height of the container 10.
- limiting part 26 is arrange
- limiting part 26 has the predetermined space
- the two second light limiting units 26 reduce the transmission amount of the light emitted from the light emitting unit 20.
- the two second light limiting portions 26 are arranged with a predetermined interval in the horizontal direction X. Since the bubbles on the inner surface 15 generated in the upper region 13b are not extremely shallow thin bubbles 18, they can also be detected by the structure of the second light limiting portion 26.
- the predetermined interval in the horizontal direction X is narrower than the width in the horizontal direction X of the region 13 b above the trunk portion 13. In an image processing unit 53 to be described later, a dark portion of the seam 16 and the meat unevenness 19 can be removed by performing a difference process in the vertical direction Y on a portion corresponding to the upper region 13b in the image 80.
- the second light limiting unit 26 can use a light shielding plate.
- a thin metal plate such as an iron plate can be used.
- the second light limiting unit 26 is fixed to the light emitting unit 20 with a bolt 28 at the end in the horizontal direction X of the light emitting unit 20.
- the second light restricting portion 26 has two elongated holes 264 on the upper and lower sides, can be moved in the vertical direction Y by loosening the bolts 28, and can be adjusted in position according to the height of the container 10.
- Rotation Support Unit As illustrated in FIG. 1, the rotation support unit 30 and the side roller 32 rotate the container 10 around the axis 12.
- the rotation support unit 30 supports the bottom 14 of the container 10.
- the axis 12 is an imaginary line serving as a rotation center axis around which the container 10 rotates.
- the rotation support unit 30 may be a member for transporting the container 10 to a predetermined position to be inspected shown in FIGS. 1 and 2 in a state where the container 10 is supported. In that case, the container 10 is intermittently conveyed sequentially to a predetermined position where the container 10 is inspected by the rotation support unit 30, and the container 10 is rotated around the axis 12 when the container 10 is disposed at the predetermined position.
- the rotation support unit 30 rotates by transmitting the driving force of the motor 60 to the rotation support unit 30 and the side rollers 32 via the belt 35 or the like according to a command from the rotation control unit 62.
- the rotation support portion 30 rotates a predetermined amount at a predetermined speed when the container 10 is conveyed to a position to be inspected.
- the predetermined amount of rotation is an amount sufficient to image the entire circumference of the container 10.
- the predetermined amount of rotation is set to 1.2 rotations or more so that the entire detected body can be grasped by one image data.
- the rotation amount of the rotation support unit 30 is calculated by the control unit 50 based on the output of the rotation detection unit 54.
- the rotation detection unit 54 can be a rotary encoder attached to the motor 60 directly or indirectly.
- Imaging Unit 40 As shown in FIG. 1, the imaging unit 40 is disposed to face the light emitting unit 20 with the container 10 interposed therebetween. The imaging unit 40 is disposed so as to photograph the surface of the container 10 on the axis 12. The imaging unit 40 can image at least a part to be inspected of the container 10, and is arranged here so that the entire vertical direction Y of the body part 13 of the container 10 falls within the field of view of the imaging unit 40.
- the imaging unit 40 can capture an image including the detection body (including the thin bubble 18) by the light of the light emitting unit 20 that has passed through the container 10.
- a known line sensor camera can be used as the imaging unit 40.
- the imaging unit 40 captures images according to the rotation speed of the rotation support unit 30 by the output of the rotation detection unit 54, so that the image 80 is not affected even if the rotation speed changes for some reason.
- the imaging unit 40 captures the entire circumference of the body unit 13, sends the data to the image processing unit 53 of the control unit 50, and performs predetermined processing on the image 80.
- a stripe pattern extending in the horizontal direction X appears in a portion corresponding to the region 13 a below the body portion 13 in the image 80 before image processing. This is the influence of the light reduction unit 242 and the light transmission unit 244 of the first light limiting unit 24 shown in FIGS. 1 and 2.
- the portion corresponding to the lower region 13a in the image 80 is irradiated with a large amount of light diffusing in the horizontal direction X by the first light restricting unit 24, and the light diffusing in the vertical direction Y is below the barrel 13. Therefore, the shadow of the seam 16 hardly appears in the image 80.
- the seam 16 and the meat unevenness 19 in the upper region 13 b corresponding to the second light restricting portion 26 not having the structure like the first light restricting portion 24 appear in the image 80.
- the image processing unit 53 performs a known gradation conversion process in the vertical direction Y so as to eliminate the stripe pattern by the first light limiting unit 24 on the image 80, and the seam 16 and the meat unevenness 19 in the upper region 13 b are processed.
- a known gradation conversion process in the horizontal direction X can be performed so as to eliminate the shadow.
- a shading correction process for performing gradation conversion based on a difference from the reference image, a dynamic threshold method (dynamic binarization process), or the like can be employed.
- a dynamic threshold method dynamic binarization process
- the gradation conversion processing for example, real time density correction by Keyence Corporation can be adopted.
- Real-time shading correction refers to correcting changes in the background brightness of image data that may occur depending on the illumination state of the container 10 to be inspected. For example, when brightness unevenness occurs such that the portion corresponding to the bottom portion 14 in the image 80 is darker than the body portion 13, correction is performed so that the entire image has uniform brightness by real-time density correction.
- the determination unit 52 is a part of the control unit 50. Therefore, the control unit 50 instructs the subsequent processing of the inspected container 10 based on the determination result of the determination unit 52.
- the determination unit 52 may be provided separately from the control unit 50. In that case, the determination result of the determination unit 52 is notified to the control unit 50.
- FIG. 6 is a diagram for explaining modes of the outlines 18a to 18d of the thin bubble 18 in the captured image
- FIG. 7 is a diagram for explaining an inspection mode in the determination unit 52. 6 and 7 show the outlines 18a to 18d of the thin bubble 18 after the image 80 of FIG. 3 is subjected to the difference processing between the vertical direction Y and the horizontal direction X by the image processing unit 53.
- FIG. 6 and 7 show the outlines 18a to 18d of the thin bubble 18 after the image 80 of FIG. 3 is subjected to the difference processing between the vertical direction Y and the horizontal direction X by the image processing unit 53.
- FIG. 6 schematically shows an annular outline 18a, a divided outline 18b, an arcuate outline 18c, and a bright portion 18d.
- the determination unit 52 has an inspection method for recognizing the four types of contours 18a to 18d as defects (thin bubbles 18).
- the determination unit 52 Based on the image data after the image processing, the determination unit 52 recognizes a portion darker than the surroundings as a detection body based on, for example, brightness, and performs all of the following determination processing for each detection body. Then, the container 10 determined by the determination unit 52 to have a defect is determined as a defective product, and the control unit 50 guides the container 10 to the discharge line.
- annular outline 18a at the upper left of FIG. 6 is a detection body in which the shape of the recognized detection body is connected in an annular shape.
- the determination unit 52 recognizes at least one detection body from the captured image 80 (FIG. 3), and detects when the shape of the recognized detection body is a detection body connected in a ring shape.
- a defect can be determined based on the area of the body. By determining in this way, the detection body having the annular contour 18a can be determined as a defect, and the container 10 having the defect can be determined as a defective product.
- an inspection region 81 including the entire annular contour 18a is set, and the area of the annular contour 18a inside the inspection region 81 is surrounded by the annular contour 18a.
- a predetermined threshold value it is determined that the annular contour 18a is a defect, and the container 10 is determined to be defective.
- a defect thin bubble
- divided contours Two types of divided contours 18b in the middle of FIG. 6 are detected bodies that are recognized by dividing the shape of the recognized detected body into a plurality of shapes.
- the divided outline 18b on the left side is divided into two, and the divided outline 18b on the right side is divided into four. If it is divided in this way, it cannot be recognized as an annular contour 18a, and therefore processing different from that in 7-1 is required.
- the determination unit 52 recognizes at least one detection body (divided contour 18 b) from the captured image 80 (FIG. 3), and is perpendicular to a predetermined range including the recognized detection body.
- a vertical inspection region 82 extending in the direction Y and a horizontal inspection region 84 extending in the horizontal direction X are set, and two or more detectors (divided contours 18b) are included in the vertical inspection region 82 and the horizontal inspection region 84. In some cases, it can be determined as a defect.
- a detection object whose outline is divided into a plurality of parts and recognized can also be determined as a defect.
- the width in the horizontal direction X is set in accordance with the width in the horizontal direction X of one divided outline 18b, and the height in the vertical direction Y is arranged in three divided outlines 18b. It is set according to the height.
- the height in the vertical direction Y is set in accordance with one divided outline 18b
- the width in the horizontal direction X is set in accordance with the width in which three divided outlines 18b are arranged.
- An arc-shaped contour 18c on the lower left side of FIG. 6 is a detector whose shape of the detected detector is an arc. Such an arc-shaped contour 18c needs to be processed differently from the above 7-1 and 7-2.
- the determination unit 52 recognizes at least one detection body from the captured image 80 (FIG. 3), and when the shape of the recognized detection body is an arc-shaped detection body, the detection body ( A defect can be determined based on the area of the arcuate contour 18c). By determining in this way, the detection body having the arcuate contour 18c can be determined as a defect, and the container 10 having the defect can be determined as a defective product.
- a circumscribed inspection region 85 circumscribing the arc-shaped contour 18c is set, and the area ratio of the area of the arc-shaped contour 18c to the area of the circumscribed inspection region 85 is equal to or greater than a predetermined threshold value.
- a defect thin bubble
- the container 10 is determined as a defective product.
- Bright portion A bright portion 18d on the right side of the lower stage of FIG. 6 is a portion having a luminance equal to or higher than a predetermined threshold value near the detection body (for example, the annular contour 18a).
- the determination unit 52 recognizes at least one detection body (for example, the annular contour 18a) from the captured image 80 (FIG. 3), and within a predetermined range including the recognized detection body.
- the container 10 can be determined to be a defect when a portion (bright portion 18d) having a brightness equal to or higher than a predetermined threshold is included. Even a detection object including a place with a bright outline and a place with a dark outline can be determined as a defect. This is because dirt or the like has only a dark portion, but in the case of a shape like the thin bubble 18, it may have a bright portion 18 d, so that it can be recognized as the thin bubble 18 even if the outline of the thin bubble 18 is small.
- the type of the detection object may be a divided outline 18b or an arcuate outline 18c.
- the inspection method of the container 10 limits the incident angle of the light from the light emitting unit 20 with respect to the vertical direction Y by the light emitted from the light emitting unit 20 and the blind 243 extending in the horizontal direction X.
- the light that has passed through the dimming unit 242 is irradiated alternately toward the container 10 in the vertical direction Y, and the image 80 of the container 10 is captured by the imaging unit 40 that is disposed opposite the light emitting unit 20 with the container 10 interposed therebetween. An image is taken, and bubbles on the inner surface 15 of the container 10 are determined as defects.
- the inspection method of the container 10 it is possible to inspect the presence or absence of a detection body such as a thin bubble 18 with an unclear outline due to a change in luminance in the vertical direction of the container surface by the light transmitting part and the light reducing part.
- FIG. 8 is a flowchart of the inspection method for the container 10.
- the control unit 50 issues a command to the rotation control unit 62 to drive the motor 60 and rotate the rotation support unit 30 and the side rollers 32 at a predetermined speed. Due to the rotation of the rotation support unit 30 and the side roller 32, the container 10 conveyed to the inspection position starts to rotate about the axis 12.
- the control unit 50 instructs the imaging unit 40 to start imaging.
- the imaging unit 40 calculates the rotation angle of the container 10 based on the output from the rotation detection unit 54 in accordance with a command from the control unit 50, and images the entire circumference of the body unit 13.
- the control unit 50 instructs the image processing unit 53 to store the image 80 in a storage unit (not shown).
- the image processing unit 53 stores at least one image 80 (for example, 1.5 laps) of the container 10.
- the control unit 50 causes the determination unit 52 to determine the presence or absence of a detection object in the stored image 80. As a result of the determination, when there is no detection object in the image 80, the process of the determination unit 52 ends, and the container 10 is transported to the next process as a non-defective product. If the result of determination is that there is a detection object in the image 80, the following four inspection algorithms are executed.
- the determination unit 52 recognizes at least one detection body from the captured image 80, and the shape of the recognized detection body is a detection body (annular contour 18a) connected in a ring shape. Further, the detection body is determined to be a defect based on the area relating to the detection body. Details of the inspection have been described in 7-1, and will be omitted.
- the determination unit 52 recognizes at least one detection body (divided contour 18b) from the captured image 80, and in the vertical direction Y within a predetermined range including the recognized detection body.
- a vertical inspection region 82 extending and a horizontal inspection region 84 extending in the horizontal direction X are set, and two or more detectors (divided contours 18b) are included in the vertical inspection region 82 and the horizontal inspection region 84, The detected object is determined as a defect.
- the details of the inspection have been described in 7-2 and will be omitted.
- the determination unit 52 recognizes at least one detection body from the captured image 80 (FIG. 3), and when the shape of the recognized detection body is an arc-shaped detection body, the detection body Based on the area regarding (arc-shaped outline 18c), the detection body is determined as a defect. The details of the inspection have been described in 7-3 and will not be repeated.
- the determination unit 52 recognizes at least one detection body (for example, the annular contour 18a) from the captured image 80, and has a predetermined threshold within a predetermined range including the recognized detection body. When a portion having a brightness higher than the value (bright portion 18d) is included, the detected body is determined as a defect. Since the details of the inspection have been described in 7-4 above, they will be omitted.
- the controller 50 determines that the defective container 10 that the determination unit 52 has determined to have a defect is discharged from a discharge unit (not shown) that is different from the transport path to the next process.
- the present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same objects and effects).
- the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced.
- the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object.
- the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.
- first light restricting part 242 Dimming section, 243: Blind, 244: Light transmission section, 246: Long hole, 26: Second light limiting section, 264: Long hole, 28: Bolt, 30: Rotation support section, 32: Side roller, 35 ... belt, 40 ... imaging unit, 50 ... control unit, 52 ... determination unit, 53 ... image processing unit, 54 ... rotation detection unit, 60 ... motor, 62 ... rotation control unit, 80 ... image, 81 ... inspection area, 82 ... vertical inspection area, 84 ... horizontal inspection area, 85 ... circumscribed inspection area , H1 ... predetermined height position, H2 ... height, W ... width
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Abstract
Description
本適用例に係る容器の検査装置は、
容器に対し光を照射する発光面を有する発光部と、
容器を挟んで前記発光部と対向して配された撮像部と、
前記撮像部で撮像した容器の画像に基づいて欠点の有無を判定する判定部と、
前記発光部の容器側に配置された光制限部と、
を含み、
前記光制限部は、前記発光面に沿って水平方向に延びる光透過部及び減光部を含み、
前記光透過部と前記減光部とは、鉛直方向で交互に配置され、
前記光透過部は、前記発光部から出射された光を容器側へ透過し、
前記減光部は、前記水平方向に延びるブラインドを前記鉛直方向に複数備え、前記発光部から出射された光の内、前記鉛直方向に対して光の入射角度を制限することを特徴とする。
本適用例に係る容器の検査装置において、
前記減光部は、前記発光部の発光面上に配置され、前記発光面からの高さが0mm~100mmであることができる。
本適用例に係る容器の検査装置において、
前記光透過部の前記鉛直方向の幅は3mm~6mmであることができる。
本適用例に係る容器の検査装置において、
前記減光部は、ライトコントロールフィルムを複数枚重ねて形成することができる。
本適用例に係る容器の検査装置において、
前記光制限部は、容器の前記鉛直方向の所定高さ位置より下方の領域に対応する位置に配置される第1光制限部であり、
前記発光部の容器側であって、前記所定高さ位置より上方の領域に対応する位置に、前記発光部から出射された光の透過量を減少させる第2光制限部をさらに含み、
前記第2光制限部は、前記水平方向で所定間隔を有して配置することができる。
本適用例に係る容器の検査装置において、
前記判定部は、撮像された画像から少なくとも1つの検出体を認識し、認識した検出体が含まれる所定の範囲に前記鉛直方向に延びる鉛直検査領域と前記水平方向に延びる水平検査領域とを設定し、前記鉛直検査領域及び前記水平検査領域内に2つ以上の検出体が含まれる場合に、欠点と判定することができる。
本適用例に係る容器の検査装置において、
前記判定部は、撮像された画像から少なくとも1つの検出体を認識し、認識した検出体の形状が環状に繋がった検出体または弧状の検出体である場合に、検出体に関する面積に基づいて欠点と判定することができる。
本適用例に係る容器の検査装置において、
前記判定部は、撮像された画像から少なくとも1つの検出体を認識し、認識した検出体が含まれる所定の範囲に、所定しきい値以上の明るさの部分が含まれる場合に、欠点と判定することができる。
本適用例に係る容器の検査方法は、
発光部から出射された光と、水平方向に延びるブラインドによって鉛直方向に対して前記発光部からの光の入射角度を制限する減光部を通過した光と、を前記鉛直方向で交互に容器に向けて照射し、
容器を挟んで前記発光部と対向して配された撮像部で容器の画像を撮像し、
容器の内表面にある泡を欠点として判定することを特徴とする。
図1~図3を用いて容器10の検査装置1の概要について説明する。図1は容器10の検査装置1(以下「検査装置1」という)の側面図であり、図2は発光部20、第1光制限部24及び第2光制限部26の正面図であり、図3は容器及びその画像を並べて示す図である。
図3及び図4を用いて検査装置1で検出しようとする欠点について説明する。図4は、薄泡18の拡大断面図である。図4では光の透過量を矢印の太さで表している。
図1及び図2を用いて発光部20について説明する。
図1、図2及び図5を用いて、光制限部である第1光制限部24及び第2光制限部26について説明する。図2において、破線で示した容器10は、第1光制限部24及び第2光制限部26の位置関係を説明するためのものである。図5は、図1のA拡大図である。
図1、図2及び図5に示すように、第1光制限部24は、容器10の鉛直方向の所定高さ位置H1(図3)より下方の領域13aに対応する位置に配置される。容器10の下方に発生する傾向がある薄泡18を確実に検出するためである。第1光制限部24は、発光面22に沿って水平方向Xに延びる光透過部244及び減光部242を含む。第1光制限部24は、光透過部244と減光部242とを鉛直方向Yで交互に配置する。第1光制限部24によって、容器10に向かって発光面22から水平方向Xに拡散して出射された光を透過し、鉛直方向Yに拡散して出射された光を制限するためである。
図2に示すように、第2光制限部26は、所定高さ位置H1より上方の領域13bに対応する位置に所定間隔をあけて2つ配置される。下方の領域13aのような非常に浅い薄泡18が発生しない領域だからである。第2光制限部26は、発光部20からの光を透過させることができる所定の間隔を有していれば、2つを連結してもよいし、一体に形成してもよい。
図1に示すように、回転支持部30及びサイドローラ32は、容器10を軸線12の周りに回転させる。回転支持部30は、容器10の底部14を支持する。軸線12は、容器10が回転する回転中心軸となる仮想線である。
図1に示すように、撮像部40は、容器10を挟んで発光部20と対向して配置される。撮像部40は、軸線12上の容器10の表面を撮影するように配置される。撮像部40は、容器10の少なくとも検査対象部分を撮影でき、ここでは容器10の胴部13の鉛直方向Yの全体が撮像部40の視野内に入るように配置される。
図1に示すように、判定部52は、制御部50の一部である。したがって、判定部52の判定結果によって制御部50が検査済みの容器10のその後の処理を指示する。判定部52は制御部50とは別に設けられてもよい。その場合には、判定部52の判定結果を制御部50に通知する。
図6の左上にある環状の輪郭18aは、認識した検出体の形状が環状に繋がった検出体である。図7に示すように、判定部52は、撮像された画像80(図3)から少なくとも1つの検出体を認識し、認識した検出体の形状が環状に繋がった検出体である場合に、検出体に関する面積に基づいて欠点と判定することができる。このように判定することで、環状の輪郭18aを有する検出体を欠点と判定し、欠点を有する容器10を不良品として判定することができる。
図6の中段にある2種類の分割された輪郭18bは、認識した検出体の形状が複数に分割して認識された検出体である。左側の分割された輪郭18bは2つに分割されており、右側の分割された輪郭18bは4つに分割されている。このように分割されていると環状の輪郭18aとして認識することができないため、前記7-1とは異なる処理が必要である。
図6の下段左側にある弧状の輪郭18cは、認識した検出体の形状が弧状の検出体である。このような弧状の輪郭18cは、前記7-1及び前記7-2とは異なる処理が必要である。
図6の下段右側にある明るい部分18dは、検出体(例えば環状の輪郭18a)の近くに所定しきい値以上の輝度を有する部分である。
本実施形態に係る容器10の検査方法は、発光部20から出射された光と、水平方向Xに延びるブラインド243によって鉛直方向Yに対して発光部20からの光の入射角度を制限する減光部242を通過した光と、を鉛直方向Yで交互に容器10に向けて照射し、容器10を挟んで発光部20と対向して配置された撮像部40で容器10の画像80を撮像し、容器10の内表面15にある泡を欠点として判定することを特徴とする。
Claims (9)
- 容器に対し光を照射する発光面を有する発光部と、
容器を挟んで前記発光部と対向して配された撮像部と、
前記撮像部で撮像した容器の画像に基づいて欠点の有無を判定する判定部と、
前記発光部の容器側に配置された光制限部と、
を含み、
前記光制限部は、前記発光面に沿って水平方向に延びる光透過部及び減光部を含み、
前記光透過部と前記減光部とは、鉛直方向で交互に配置され、
前記光透過部は、前記発光部から出射された光を容器側へ透過し、
前記減光部は、前記水平方向に延びるブラインドを前記鉛直方向に複数備え、前記発光部から出射された光の内、前記鉛直方向に対して光の入射角度を制限することを特徴とする、容器の検査装置。 - 請求項1において、
前記減光部は、前記発光部の発光面上に配置され、前記発光面からの高さが0mm~100mmであることを特徴とする、容器の検査装置。 - 請求項1または2において、
前記光透過部の前記鉛直方向の幅は3mm~6mmであることを特徴とする、容器の検査装置。 - 請求項1~3のいずれか1項において、
前記減光部は、ライトコントロールフィルムを複数枚重ねて形成されることを特徴とする、容器の検査装置。 - 請求項1~4のいずれか1項において、
前記光制限部は、容器の前記鉛直方向の所定高さ位置より下方の領域に対応する位置に配置される第1光制限部であり、
前記発光部の容器側であって、前記所定高さ位置より上方の領域に対応する位置に、前記発光部から出射された光の透過量を減少させる第2光制限部をさらに含み、
2つの前記第2光制限部は、前記水平方向で所定間隔を有して配置されることを特徴とする、容器の検査装置。 - 請求項1~5のいずれか1項において、
前記判定部は、撮像された画像から少なくとも1つの検出体を認識し、認識した検出体が含まれる所定の範囲に前記鉛直方向に延びる鉛直検査領域と前記水平方向に延びる水平検査領域とを設定し、前記鉛直検査領域及び前記水平検査領域内に2つ以上の検出体が含まれる場合に、欠点と判定することを特徴とする、容器の検査装置。 - 請求項1~6のいずれか1項において、
前記判定部は、撮像された画像から少なくとも1つの検出体を認識し、認識した検出体の形状が環状に繋がった検出体または弧状の検出体である場合に、検出体に関する面積に基づいて欠点と判定することを特徴とする、容器の検査装置。 - 請求項1~7のいずれか1項において、
前記判定部は、撮像された画像から少なくとも1つの検出体を認識し、認識した検出体が含まれる所定の範囲に、所定しきい値以上の明るさの部分が含まれる場合に、欠点と判定することを特徴とする、容器の検査装置。 - 発光部から出射された光と、水平方向に延びるブラインドによって鉛直方向に対して前記発光部からの光の入射角度を制限する減光部を通過した光と、を前記鉛直方向で交互に容器に向けて照射し、
容器を挟んで前記発光部と対向して配された撮像部で容器の画像を撮像し、
容器の内表面にある泡を欠点として判定することを特徴とする、容器の検査方法。
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- 2017-02-28 JP JP2019502323A patent/JP6796704B2/ja active Active
- 2017-02-28 WO PCT/JP2017/007814 patent/WO2018158824A1/ja active Application Filing
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JP2020190540A (ja) * | 2019-05-17 | 2020-11-26 | シンクロア株式会社 | 目視支援装置 |
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JP7312448B2 (ja) | 2019-05-17 | 2023-07-21 | シンクロア株式会社 | 目視支援装置 |
WO2020255498A1 (ja) * | 2019-06-21 | 2020-12-24 | 東洋ガラス株式会社 | ガラスびんの検査方法及びガラスびんの製造方法 |
JP2021001793A (ja) * | 2019-06-21 | 2021-01-07 | 東洋ガラス株式会社 | ガラスびんの検査方法及びガラスびんの製造方法 |
KR20210002528A (ko) * | 2019-06-21 | 2021-01-08 | 도요 가라스 가부시키가이샤 | 유리병 검사방법 및 유리병 제조방법 |
CN112492887A (zh) * | 2019-06-21 | 2021-03-12 | 东洋玻璃株式会社 | 玻璃瓶的检查方法和玻璃瓶的制造方法 |
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CN112492887B (zh) * | 2019-06-21 | 2024-07-02 | 东洋玻璃株式会社 | 玻璃瓶的检查方法和玻璃瓶的制造方法 |
US20210231576A1 (en) * | 2020-01-23 | 2021-07-29 | Schott Schweiz Ag | Detection and characterization of defects in pharmaceutical cylindrical containers |
US11841327B2 (en) * | 2020-01-23 | 2023-12-12 | Schott Pharma Schweiz Ag | Detection and characterization of defects in pharmaceutical cylindrical containers |
Also Published As
Publication number | Publication date |
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PH12019501668A1 (en) | 2020-03-02 |
CN110431406B (zh) | 2022-04-01 |
JPWO2018158824A1 (ja) | 2019-12-26 |
JP6796704B2 (ja) | 2020-12-09 |
CN110431406A (zh) | 2019-11-08 |
KR20190117604A (ko) | 2019-10-16 |
KR102205582B1 (ko) | 2021-01-21 |
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