WO2006057125A1 - 透明板状体の欠陥検査方法および装置 - Google Patents
透明板状体の欠陥検査方法および装置 Download PDFInfo
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- WO2006057125A1 WO2006057125A1 PCT/JP2005/019408 JP2005019408W WO2006057125A1 WO 2006057125 A1 WO2006057125 A1 WO 2006057125A1 JP 2005019408 W JP2005019408 W JP 2005019408W WO 2006057125 A1 WO2006057125 A1 WO 2006057125A1
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- Prior art keywords
- transparent plate
- defect
- image
- images
- main surface
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Classifications
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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
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
- G01N21/896—Optical defects in or on transparent materials, e.g. distortion, surface flaws in conveyed flat sheet or rod
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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
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8901—Optical details; Scanning details
- G01N2021/8908—Strip illuminator, e.g. light tube
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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
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
- G01N21/896—Optical defects in or on transparent materials, e.g. distortion, surface flaws in conveyed flat sheet or rod
- G01N2021/8967—Discriminating defects on opposite sides or at different depths of sheet or rod
Definitions
- the present invention relates to a transparent plate-like defect inspection method and apparatus, and in particular, various displays (LCD (Liquid Crystal Display), PDP (Plasma Display Panel), EL (Electrolumine scence), FED (Field Emission Display) or
- LCD Liquid Crystal Display
- PDP Plasma Display Panel
- EL Electrode scence
- FED Field Emission Display
- the present invention relates to a defect inspection method and apparatus for glass substrates for liquid crystal projection televisions, etc., glass substrates for automobiles and other vehicles, and glass sheets for construction.
- the defect inspection method does not deteriorate the inspection performance depending on the size of the transparent plate, can be applied to transparent plates having various thicknesses, There is also an industrial application requirement that it can be applied to the continuous molding process (online) of transparent plates represented by the glass float method.
- the camera is placed on the main surface and the back side of the transparent plate. If it is arranged, only defects can be detected. Further, by collating the detection signals of the cameras arranged on the main surface side and the back surface side of the transparent plate-like body, the position of the defect in the thickness direction of the transparent plate-like body can be determined to some extent.
- Patent Document 1 Japanese Patent Laid-Open No. 8-201313
- Patent Document 2 Japanese Patent Laid-Open No. 10-339705
- Patent Document 3 Japanese Patent Laid-Open No. 11-264803
- the conventional edge light system has several problems.
- the light incident on the transparent plate from the end face is absorbed by the transparent plate itself, and therefore is supplied to the defect at the center (the center in the plane) and the end of the transparent plate.
- the amount of light is different.
- the size of the transparent plate, or the difference in the amount of light is not a big problem, but as the size of the transparent plate increases, the difference in the amount of supplied light becomes more prominent and the in-plane distribution of the detection performance increases. wear. Since this situation becomes worse as the thickness of the transparent plate increases, it can be said that the edge light method has a narrower applicable range of thickness than other methods.
- one object of the present invention is to inspect as the transparent plate becomes larger.
- the object is to eliminate the problem of the prior art that the performance decreases.
- Another object of the present invention is to specify the position of the defect in the thickness direction of the transparent plate more accurately than in the prior art.
- the present invention provides a defect inspection method for bubbles, scratches, foreign matter, etc. present in a transparent plate-like body, the wire disposed on the main surface side of the transparent plate-like body
- An image of the main surface of the transparent plate-like body (hereinafter referred to as the first image) using a first reflective bright-field optical system having a cylindrical light source and a camera; Imaging a back surface image of the transparent plate (hereinafter referred to as a second image) using a linear light source and a second reflective bright field optical system having a camera disposed on the back surface side; Searching for defect candidates for each of the first and second images, and whether or not there is a defect candidate at a position corresponding to each other in the first and second images based on the result of the search.
- a body defect inspection method is provided.
- the present invention also relates to a defect inspection method for bubbles, scratches, foreign matters, etc. present in a transparent plate-like body, comprising a linear light source and a camera arranged on the main surface side of the transparent plate-like body.
- a step of taking an image of a main surface of the transparent plate-like body (hereinafter referred to as a first image) using a first reflective bright-field optical system, and a back surface side of the transparent plate-like body A step of taking an image of the back surface of the transparent plate-like body (hereinafter referred to as a second image) using a second reflective bright field optical system having a linear light source and a camera; Searching for defect candidates for each of the two images, determining whether the image is a real image or a virtual image based on the contrast of the defect candidate image obtained by the search, and Based on the appearance pattern of the virtual image, the defect candidate is the transparent plate Major surfaces, provides a defect inspection method of the transparent plate-shaped object that, comprising the steps of: identifying whether
- the present invention is a defect inspection method for bubbles, scratches, foreign matters, etc. present in a transparent plate, An image of the main surface of the transparent plate (hereinafter referred to as the first image) using a first reflective bright field optical system having a linear light source and camera disposed on the main surface of the transparent plate. ) And a second reflective bright-field optical system having a linear light source and a camera disposed on the back surface side of the transparent plate-like body.
- a defect inspection method for a transparent plate-like body is provided.
- the thickness of the transparent plate-like body is used as known information, and the distance between two images appearing on the same camera with respect to the same defect is determined.
- the method further includes a step of obtaining the depth of the defect in the thickness direction of the transparent plate-like body.
- the present invention is a defect inspection apparatus for bubbles, scratches, foreign matter, etc. present in a transparent plate-like body, comprising a linear light source and a camera arranged on the main surface side of the transparent plate-like body.
- a first reflective bright-field optical system for capturing an image of the main surface of the transparent plate-like body hereinafter referred to as a first image
- a back side of the transparent plate-like body hereinafter referred to as a first image
- a second reflective bright field optical system for taking an image of the back surface of the transparent plate (hereinafter referred to as a second image), and the first and second A defect candidate is searched for each of the images, and based on the result of the search, it is confirmed whether there is a defect candidate at a position corresponding to each of the first and second images, and the first and second images are checked.
- One Chikaratsu only person provides a defect inspection apparatus for a transparent plate-shaped object, characterized by chromatic and computer to regard the defect candidate as a pseudo defect.
- the present invention is a defect inspection apparatus for bubbles, scratches, foreign matter, etc. present in a transparent plate-like body, comprising a linear light source and a camera arranged on the main surface side of the transparent plate-like body.
- a first reflective bright-field optical system for capturing an image of the main surface of the transparent plate-like body hereinafter referred to as a first image
- a back side of the transparent plate-like body hereinafter referred to as a first image
- a linear light source and a camera A second reflective bright field optical system for capturing an image of the back surface of the transparent plate (hereinafter referred to as a second image), and a defect candidate for each of the first and second images; Based on the contrast of the defect candidate image obtained by this search, it is determined whether the image is a real image or a virtual image. Based on the appearance pattern of the real image or the virtual image, the defect candidate is the main image of the transparent plate-like body.
- a defect inspection apparatus for a transparent plate-like body characterized in that it comprises a computer for identifying whether it is on the front surface, inside or back surface.
- the present invention is also a defect inspection apparatus for bubbles, scratches, foreign matters, etc. present in a transparent plate-like body, comprising a linear light source and a camera arranged on the main surface side of the transparent plate-like body.
- a first reflective bright-field optical system for capturing an image of the main surface of the transparent plate-like body hereinafter referred to as a first image
- a back side of the transparent plate-like body hereinafter referred to as a first image
- a second reflective bright field optical system for taking an image of the back surface of the transparent plate (hereinafter referred to as a second image), and the first and second A defect candidate is searched for each of the images, and a distance between two images appearing in the same camera with respect to the same defect candidate is obtained, and the defect candidate is determined based on the distance between the two images.
- a computer comprising a step for identifying whether the main surface is inside, inside or back.
- the computer uses the thickness of the transparent plate-like body as known information, and the thickness of the transparent plate-like body based on the distance between two images appearing on the same camera with respect to the same defect. It is preferable to further have a function of obtaining the depth of the defect in the direction.
- the present invention uses the defect candidate images appearing on the main surface side and the back surface side of the transparent plate-like body, thereby allowing defects (bubbles, scratches, foreign objects, etc.) and pseudo defects (dust). And on-line defect inspection.
- the present invention can accurately identify the position of the defect in the thickness direction of the transparent plate, the inspection performance does not deteriorate depending on the size of the transparent plate, and the edge light method.
- effects such as a wide range of thickness of the transparent plate that can be applied are obtained.
- the present invention can also be applied to plate glass continuous forming processes such as the float method.
- FIG. 1 is a diagram illustrating a basic configuration of the present invention.
- FIG. 2 is a diagram for explaining how the upper and lower line sensor cameras obtain a bright field.
- FIG. 3 is a diagram for explaining how the upper line sensor camera obtains an image of a defect on the main surface of a transparent plate.
- FIG. 4 is a diagram for explaining how the lower line sensor camera obtains an image of a defect on the main surface of the transparent plate.
- FIG. 5 is a diagram for explaining how the upper line sensor camera obtains an image of a defect inside a transparent plate.
- FIG. 6 is a diagram for explaining how the lower line sensor camera obtains an image of a defect inside the transparent plate.
- FIG. 7 is a diagram illustrating how the upper line sensor camera obtains an image of a defect on the back surface of a transparent plate.
- FIG. 8 is a diagram illustrating how the lower line sensor camera obtains an image of a defect on the back surface of a transparent plate.
- FIG. 9 is a diagram for explaining how an upper line sensor camera obtains an image of a pseudo defect on the main surface of a transparent plate-like body.
- FIG. 10 is a diagram for explaining how the lower line sensor camera obtains an image of a pseudo defect on the main surface of a transparent plate-like body.
- FIG. 11 is a diagram for explaining how an upper line sensor camera obtains an image of a pseudo defect on the back surface of a transparent plate.
- FIG. 12 is a diagram for explaining how the lower line sensor camera obtains an image of a pseudo defect on the back surface of the transparent plate.
- FIG. 13 is a diagram illustrating the relationship between the type of defect and the like and the image captured by each camera.
- FIG. 14 is a diagram for explaining how the lower line sensor camera obtains an image of internal defects near the back surface of the transparent plate.
- FIG. 15 is a diagram showing a result of an attempt to distinguish a defect from a pseudo defect according to the present invention (Example).
- FIG. 16 Results of an attempt to distinguish between defects on the main surface and internal defects near the main surface according to the present invention. (Example).
- FIG. 17 is a view showing the results of measuring the depth of defects according to the present invention (Example).
- FIG. 1 is an explanatory diagram showing the basic configuration of the present invention.
- the linear light source 2 and the line sensor camera 3 are installed above the transparent plate 1 on the transport roller 6, and the linear light source 4 and the line sensor are located below the transparent plate 1.
- Camera 5 is provided.
- the transparent plate 1 is conveyed at a constant speed in the direction of the arrow by the conveyance port roller 6, and at the same time, the transparent plate is continuously imaged by the line sensor camera 3 and the line sensor camera 5.
- the computer 7 performs arithmetic processing on the images of both line sensor cameras at the same time, and performs defect inspection.
- Both the linear light source 2 and the line sensor force Mela 3 light receiving element are connected in a direction perpendicular to the paper surface (the width direction of the transparent plate 1).
- a fluorescent lamp is installed in a light source box having a slit, a halogen lamp or a metal halide lamp with a single optical fiber in a light guide having a linear light emitting portion.
- Various light sources such as those that supply the light can be employed.
- the linear light source 2 is positioned in the regular reflection direction of the line sensor camera 3 with respect to the transparent plate 1, and similarly the linear light source 4 is line sensor camera with respect to the transparent plate 1. Located in the 5 regular reflection direction. With this arrangement, a reflection image of the linear light source 2 is reflected on the line sensor camera 3, and a reflection image of the linear light source 4 is reflected on the line sensor camera 5, each having a bright field.
- Figure 2 (a) shows how the bright field is obtained in the line sensor camera 3.
- the light emitted from the linear light source 2 reaches the line sensor camera 3 mainly through two light beam paths.
- One is the light path 8 through the reflection by the main surface of the transparent plate 1 (the upper surface of the transparent plate 1), and the other is the back of the transparent plate 1 (under the transparent plate 1).
- This is the ray path 9 through the reflection by the side surface 8.
- Line sensor camera 3 has a bright field where the images of these two beam paths 8, 9 overlap.
- FIG. 2 (b) shows a state where a bright field is obtained in the line sensor camera 5.
- the light emitted from the linear light source 4 reaches the line sensor camera 5 mainly through two light beam paths.
- One of the ray paths is a ray path 10 through reflection by the back surface of the transparent plate 1, and the other is a ray path 11 through reflection by the main surface of the transparent plate 1.
- the line sensor camera 5 has a bright field where the images of these two beam paths 10 and 11 overlap.
- FIGS. 3 (a) and 3 (b) and FIG. 4 show how the line sensor cameras 3 and 5 obtain an image of the defect 12 on the main surface of the transparent plate 1.
- Fig. 3 (a) and 3 (b) and FIG. 4 show how the line sensor cameras 3 and 5 obtain an image of the defect 12 on the main surface of the transparent plate 1.
- the line sensor camera 3 obtains a real image of the defect 12 by overlapping the images of these two light paths 8 and 9.
- FIG. 3 (b) shows a situation in which the transport of the transparent plate 1 further proceeds and the defect 12 intersects only with the light beam path 9.
- the defect 12 causes the optical behavior only to the light traveling in the light path 9.
- the line sensor camera 3 obtains a virtual image of the defect 12 by overlapping the images of the two light beam paths 8 and 9.
- Figure 4 shows the situation where defect 12 intersects only ray path 11.
- the defect 12 causes an optical behavior only to the light traveling in the light path 11.
- the line sensor camera 5 obtains a virtual image of the defect 12 by superimposing the images of these two beam paths 10 and 11.
- FIGS. 5A and 5B and FIGS. 6A and 6B show how the line sensor cameras 3 and 5 obtain an image of the defect 13 inside the transparent plate 1.
- Figure 5 (a) shows the situation where defect 13 intersects only ray path 9. At this time, the defect 13 causes an optical behavior only to the light traveling in the light path 9.
- the line sensor camera 3 obtains a virtual image of the defect 13 by superimposing the images of these two beam paths 8 and 9.
- FIG. 5 (b) shows a situation where the transparent plate 1 is further conveyed and the defect 13 intersects only the ray path 9. At this time, the defect 13 causes an optical behavior only to the light traveling in the light path 9.
- the line sensor camera 3 obtains a virtual image of the defect 13 by overlapping the images of the two light paths 8 and 9.
- Figure 6 (a) shows the situation where the defect 13 intersects only the ray path 11. At this time, the defect 13 causes an optical behavior only to the light traveling in the light path 11.
- the line sensor camera 5 obtains a virtual image of the defect 13 by overlapping the images of the two light beam paths 10 and 11.
- Fig. 6 (b) shows the situation where the transparent plate 1 is further conveyed and the defect 13 intersects only the light path 11. At this time, the defect 13 causes an optical behavior only to the light traveling in the light path 11.
- the line sensor camera 5 obtains a virtual image of the defect 13 by overlapping the images of the two light beam paths 10 and 11.
- FIG. 7 and FIGS. 8A and 8B show how the line sensor cameras 3 and 5 obtain an image of the defect 14 on the back surface of the transparent plate 1.
- Figure 7 shows that defect 14 intersects only ray path 9. Shows the situation.
- the defect 14 causes an optical behavior only to the light traveling in the light path 9.
- the line sensor camera 3 obtains a virtual image of the defect 14 by overlapping the images of these two light beam paths 8 and 9.
- Figure 8 (a) shows the situation where the defect 14 intersects only the ray path 11.
- the defect 14 causes an optical behavior only to the light traveling in the light path 11.
- the line sensor camera 3 obtains a virtual image of the defect 14 by overlapping the images of the two light beam paths 10 and 11.
- FIG. 8B shows a situation in which the transport of the transparent plate 1 further proceeds and the defect 14 intersects the light path 10 and the light path 11 at the same time.
- the defect 14 causes an optical behavior in the light traveling in the light path 10 and the light path 11.
- the line sensor camera 5 obtains a real image of the defect 14 by superimposing the images of the two optical beam paths 10 and 11.
- FIGS. 9A and 9B and FIG. 10 show how the line sensor cameras 3 and 5 obtain an image of the pseudo defect 15 on the main surface of the transparent plate 1.
- Fig. 9 (a) shows a situation in which the pseudo defect 15 intersects the ray path 8 and the ray path 9 simultaneously.
- the pseudo defect 15 causes an optical behavior in the light traveling in the light path 8 and the light path 9.
- the line sensor camera 3 obtains a real image of the pseudo defect 15 by superimposing the images of the two light beam paths 8 and 9.
- FIG. 9 (b) shows a situation where the transparent plate 1 is further conveyed and the pseudo defect 15 intersects only the ray path 9.
- the pseudo defect 15 causes an optical behavior only to the light traveling in the light path 9.
- the line sensor camera 3 obtains a virtual image of the pseudo defect 15 by overlapping the images of these two light beam paths 8 and 9.
- FIG. 10 shows a situation where the pseudo defect 15 is located at the reflection point of the light path 11. However, since the pseudo defect 15 is outside the transparent plate-like body 1, it does not cause an optical behavior to the light traveling in the light path 11. As a result, the line sensor camera 5 does not acquire an image of the pseudo defect 15.
- FIG. 11 and FIGS. 12A and 12B show how the line sensor cameras 3 and 5 obtain an image of the pseudo defect 16 on the back surface of the transparent plate 1.
- Fig. 11 shows the situation where the pseudo defect 16 is located at the reflection point of the ray path 9.
- the pseudo defect 16 since the pseudo defect 16 is outside the transparent plate-like body 1, it does not cause an optical behavior to the light traveling in the light path 9. As a result, the line sensor camera 3 does not acquire an image of the pseudo defect 16.
- FIG. 12 (a) shows a situation in which the pseudo defect 16 intersects only the ray path 11.
- the pseudo defect 16 causes an optical behavior only to the light traveling in the light path 11.
- the line sensor camera 3 obtains a virtual image of the pseudo defect 16 by superimposing the images of the two light beam paths 10 and 11.
- FIG. 12 (b) shows a situation where the transparent plate 1 is further conveyed and the pseudo defect 16 intersects the light path 10 and the light path 11 at the same time.
- the pseudo defect 16 causes an optical behavior in the light traveling in the light path 10 and the light path 11.
- the line sensor camera 5 obtains a real image of the pseudo defect 16 by superimposing the images of the two light beam paths 10 and 11.
- FIGS. 13A to 13E are diagrams for explaining the relationship between the type of defect or the like and the image captured by each camera.
- the pattern of defect candidate images obtained by each line sensor camera differs depending on the type and position of the defect or the like.
- Table 1 lists the appearance patterns of images obtained by the line sensor camera for defects and pseudo defects. When two images are observed with the same line sensor camera for the same defect, these images are regarded as one set and are hereinafter referred to as “double images”.
- the upper and lower line sensor cameras each obtain two virtual images, but when the defect is close to the main surface or the back surface, two virtual images May overlap and you may see only one image.
- the virtual images captured by the upper line sensor camera overlap and appear to be one image. Sometimes I can't see it.
- the virtual image captured by the lower line sensor camera may overlap, and only one image may appear.
- the thickness of the transparent plate-like body is obtained using the image of the line sensor camera on which the virtual images do not overlap as a clue. It is possible to correctly specify the position of the defect in the vertical direction. At this time, in the present invention, the contrast of the double image and the distance between the two images constituting the double image are used.
- the double image captured by the line sensor camera is a combination of a real image and a virtual image when the defect is on the main surface or the back surface.
- the double image is a combination of virtual images.
- the contrast of the double image is different, and when it is inside, the contrast is not different. Therefore, by comparing the contrast of the double images, it can be seen whether the defect is inside the transparent plate or on the main surface (or the back surface).
- FIG. 14 shows a situation where the line sensor camera 5 obtains an image of the internal defect 17 near the back surface.
- the distance 18 between point 1 7a and 17b is proportional to the depth of the main surface force of transparent plate 1 of defect 17.
- the transparent plate 1 is conveyed at a constant speed and the scanning speed of the line sensor camera is constant, the distance 18 is observed as the distance between the two images constituting the double image in the image.
- the step of specifying whether the defect candidate is on the main surface, the inside or the back surface of the transparent plate-like body explain.
- the distance 18 is the longest when the defect 17 is on the back side. If the maximum distance between the two images forming the double image is known in advance, the relationship between the distance between the two images forming the actual double image and the distance between the two images will cause the defect 17 It can be distinguished whether there is.
- the double image obtained by the line sensor camera 3 above the transparent plate-like body 1 can be used to distinguish whether the defect is inside or on the main surface.
- the step of obtaining the depth of the defect in the thickness direction of the transparent plate will be described.
- the distance 18 is By utilizing the fact that it is proportional to the depth of the defect, the distance between the two images constituting the double image can be converted into the depth of the defect.
- substrate glass for liquid crystal panels
- a substrate glass for liquid crystal panels hereinafter referred to as substrate glass
- substrate glass having a thickness of 0.7 mm as the transparent plate-like body.
- Fig. 1 we prepared two line sensor cameras and a reflected bright-field optical system with two linear light sources using fluorescent lamps, which were placed above and below the substrate glass.
- the angle between the optical axis of the line sensor camera and the normal of the substrate glass was 30 degrees.
- the conveyance speed of the substrate glass by the conveyance roller 6 was 1 OO mmZ second.
- the upper and lower line sensor cameras were continuously scanned, and images near the defect and the pseudo defect were cut out. Then, the upper and lower line sensor camera images (i.e., defect candidate images) for the same defect or pseudo defect are paired to distinguish the defect from the pseudo defect, to specify the position of the defect thickness direction, and to the defect thickness direction. I tried to measure the depth.
- FIG. 15 shows the result of examining the detection signals of the upper and lower line sensor cameras after dust, which is a pseudo defect, was previously scattered on the main surface of the substrate glass.
- A is the upper The detection signal of the in-sensor camera
- B shows the detection signal of the lower line sensor camera
- the horizontal axis shows the individual pseudo defects
- the vertical axis shows the strength of the detection signals of the upper and lower line sensor cameras.
- the strength of the detection signal is expressed as the signal-to-noise ratio obtained by dividing the detection signal by the noise level.
- the upper line sensor camera detects individual dust significantly, while the lower line sensor camera does not. Therefore, it was confirmed that the defect can be distinguished from the pseudo defect by this verification.
- Figure 16 shows the results of an attempt to distinguish the location of internal defects within 10 m (measured in advance) from the main surface and defects on the main surface.
- A is the surface defect
- B is the defect within 10 m from the surface
- the horizontal axis is the intensity of the detection signal of the image that first entered the field of view of the line sensor camera in the double image of the defect.
- the vertical axis shows the strength of the detection signal of the second image in the field of view of the line sensor camera in the double image of the defect.
- the strength of the detection signal is represented by the signal-to-noise ratio as in Fig. 15. As is clear from Fig.
- the intensity of the detection signals of the two images is almost the same even within 10 m from the main surface. Therefore, it was confirmed that the position of the defect in the thickness direction of the transparent plate could be specified by this verification.
- the broken lines in the figure are ideally straight lines that pass through the origin of the coordinate axes.
- FIG. 17 shows the results of determining the depth of the principal surface force of the distance force defect of the two images constituting the double image.
- Figure 17 (a) shows the results with the upper line sensor camera
- Fig. 17 (b) shows the results with the lower line sensor camera.
- the horizontal axis is the true value of the depth of the defect measured separately
- the vertical axis shows the distance between the two images forming the double image captured by the line sensor camera.
- the depth of the defect is in a relation that can be described by a linear expression that is proportional to the distance between the two images constituting the double image, and is highly correlated.
- the defect depth can be accurately measured from the distance between the two images forming the double image.
- the cameras are placed above and below the transparent plate. Because of the arrangement, even if there is a situation where double images overlap in one line sensor camera, the double image is separated in the other line sensor camera. As a result, the sharing of the upper and lower line sensor cameras can be changed according to the depth of the defect, and the depth of the defect can be measured over the entire thickness as shown in FIGS. 17 (a) and 17 (b). This verification confirmed that the depth of defects can be measured with high accuracy.
- the present invention can distinguish between a defect and a pseudo-defect, and can increase the accuracy of specifying the position of the defect in the thickness direction of the transparent plate-like body. it can. Further, since the present invention does not require the smoothness of the end face of the transparent plate-like body, it can be applied to a continuous forming process such as a plate glass float method, and defect information can be quickly grasped in an upstream process of the process. Therefore, the present invention greatly contributes to the construction of a defect inspection system superior to the conventional one. It should be noted that the entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2004-339215 filed on November 24, 2004 are hereby disclosed, and the specification of the present invention is disclosed. As it is incorporated.
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Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006547681A JP4793266B2 (ja) | 2004-11-24 | 2005-10-21 | 透明板状体の欠陥検査方法および装置 |
EP05805124A EP1816466B1 (en) | 2004-11-24 | 2005-10-21 | Method and device for inspecting defect of transparent plate body |
US11/752,577 US7420671B2 (en) | 2004-11-24 | 2007-05-23 | Defect inspection method and apparatus for transparent plate-like members |
US12/174,190 US7796248B2 (en) | 2004-11-24 | 2008-07-16 | Defect inspection method and apparatus for transparent plate-like members |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-339215 | 2004-11-24 | ||
JP2004339215 | 2004-11-24 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/752,577 Continuation US7420671B2 (en) | 2004-11-24 | 2007-05-23 | Defect inspection method and apparatus for transparent plate-like members |
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WO2006057125A1 true WO2006057125A1 (ja) | 2006-06-01 |
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PCT/JP2005/019408 WO2006057125A1 (ja) | 2004-11-24 | 2005-10-21 | 透明板状体の欠陥検査方法および装置 |
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US (2) | US7420671B2 (ja) |
EP (3) | EP2166344A1 (ja) |
JP (1) | JP4793266B2 (ja) |
KR (1) | KR100897223B1 (ja) |
TW (1) | TW200622186A (ja) |
WO (1) | WO2006057125A1 (ja) |
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JP2008522213A (ja) * | 2005-03-02 | 2008-06-26 | セミシスコ・カンパニー・リミテッド | ガラス基板のエッジ欠陥及びディスカラー検査装置及び方法 |
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WO2012077542A1 (ja) * | 2010-12-09 | 2012-06-14 | 旭硝子株式会社 | ガラス基板 |
WO2012077683A1 (ja) * | 2010-12-09 | 2012-06-14 | 旭硝子株式会社 | ガラスリボン内欠陥測定方法およびガラスリボン内欠陥測定システム |
WO2017104575A1 (ja) * | 2015-12-16 | 2017-06-22 | 株式会社リコー | 検査システム及び検査方法 |
CN108369194A (zh) * | 2015-12-16 | 2018-08-03 | 株式会社理光 | 检查系统及检查方法 |
JPWO2017104575A1 (ja) * | 2015-12-16 | 2018-08-30 | 株式会社リコー | 検査システム及び検査方法 |
WO2017170402A1 (ja) * | 2016-03-31 | 2017-10-05 | パナソニックIpマネジメント株式会社 | 検査方法、検査システム、製造方法 |
JPWO2017170402A1 (ja) * | 2016-03-31 | 2019-01-24 | パナソニックIpマネジメント株式会社 | 検査方法、検査システム、製造方法 |
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CN107255641A (zh) * | 2017-06-06 | 2017-10-17 | 西安理工大学 | 一种针对自聚焦透镜表面缺陷进行机器视觉检测的方法 |
US20220163458A1 (en) * | 2019-04-10 | 2022-05-26 | Deltamax Automazione S.R.L. | Method for the identification of defects in transparent slabs and related system |
Also Published As
Publication number | Publication date |
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EP1816466A1 (en) | 2007-08-08 |
KR20070084169A (ko) | 2007-08-24 |
US20080278718A1 (en) | 2008-11-13 |
TW200622186A (en) | 2006-07-01 |
EP1816466B1 (en) | 2010-06-23 |
JP4793266B2 (ja) | 2011-10-12 |
KR100897223B1 (ko) | 2009-05-14 |
JPWO2006057125A1 (ja) | 2008-06-05 |
US20070216897A1 (en) | 2007-09-20 |
US7420671B2 (en) | 2008-09-02 |
EP2161567A1 (en) | 2010-03-10 |
EP2166344A1 (en) | 2010-03-24 |
EP1816466A4 (en) | 2009-11-11 |
US7796248B2 (en) | 2010-09-14 |
TWI357490B (ja) | 2012-02-01 |
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