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WO2012081398A1 - Plaque de verre, procédé pour inspecter une plaque de verre, et procédé pour fabriquer une plaque de verre - Google Patents

Plaque de verre, procédé pour inspecter une plaque de verre, et procédé pour fabriquer une plaque de verre Download PDF

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Publication number
WO2012081398A1
WO2012081398A1 PCT/JP2011/077590 JP2011077590W WO2012081398A1 WO 2012081398 A1 WO2012081398 A1 WO 2012081398A1 JP 2011077590 W JP2011077590 W JP 2011077590W WO 2012081398 A1 WO2012081398 A1 WO 2012081398A1
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WO
WIPO (PCT)
Prior art keywords
glass plate
pixel
value
calculated
glass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/077590
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English (en)
Japanese (ja)
Inventor
信 楜澤
隆之助 黒田
誠彦 ▲樋▼口
道人 佐々木
元之 広瀬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGC Inc
Original Assignee
Asahi Glass Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Glass Co Ltd filed Critical Asahi Glass Co Ltd
Priority to KR1020137015343A priority Critical patent/KR20130126638A/ko
Priority to CN2011800602937A priority patent/CN103261104A/zh
Priority to JP2012548718A priority patent/JPWO2012081398A1/ja
Publication of WO2012081398A1 publication Critical patent/WO2012081398A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1121—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades pin-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/50—Pipe mixers, i.e. mixers wherein the materials to be mixed flow continuously through pipes, e.g. column mixers
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/18—Stirring devices; Homogenisation
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/18—Stirring devices; Homogenisation
    • C03B5/187—Stirring devices; Homogenisation with moving elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
    • 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
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N2021/9513—Liquid crystal panels

Definitions

  • the present invention relates to a glass plate, a glass plate inspection method, and a glass plate manufacturing method.
  • the brightness is observed in stripes.
  • the image which visualized the non-uniformity in composition in the glass plate is called a stria image.
  • Schlieren method as a method for photographing a streak image.
  • Patent Document 1 describes a method for inspecting plate glass by the Schlieren method.
  • the inspection method described in Patent Document 1 parallel light that has passed through a plate glass is enlarged and projected onto a screen using a lens. Then, the image is divided into several parts and photographed with a CCD camera. For the image taken by the CCD camera, the image processor recognizes the edge of the plate glass and performs shape processing of the outer shape of the image. Then, the personal computer collects continuous data as light and dark data of the original sheet glass.
  • Patent Document 2 describes an extreme ultraviolet optical element with reduced striations.
  • the glass plate in which the stripe pattern (strie) is remarkably observed in the streak image is considered to have a non-uniform composition of the glass plate, which is not preferable in quality.
  • a glass plate in which a stripe pattern (strie) along the thickness direction of the glass plate is observed in the strie image has uneven composition depending on the position where light is transmitted, and the refractive index distribution is uneven. It is not preferable.
  • the uneven refractive index distribution causes color unevenness in the liquid crystal display device.
  • the glass plate has a large area and is thin.
  • an object of the present invention is to provide a large and thin glass plate whose composition is more than a certain level.
  • an object of the present invention is to provide a glass plate inspection method capable of selecting a glass plate whose glass composition is uniform to a certain level or more.
  • the glass plate according to the present invention is a rectangular glass plate having a thickness of 0.05 to 0.7 mm, a long side length of 1800 mm or more, and a short side length of 1500 mm or more, A streak image shooting target glass plate is cut out from the glass plate with a width of 1.2 cm in a streak direction, and is a side streak image orthogonal to the streak direction of the shooting target glass plate.
  • the pixels in the area representing the glass plate to be photographed are sequentially selected, the pixel value of arbitrary coordinates (X, Y) is represented as C (X, Y), and the coordinates of the selected pixel are represented by ( x, y), and when the difference average value, which is the average value of the pixel value differences of a plurality of predetermined pairs of pixels existing on both sides of the selected pixel, is expressed as T 2 ⁇ k ,
  • the evaluation value p obtained by the calculation of Expression (3) may be less than 4.
  • the glass plate inspection method is a glass plate inspection method for inspecting the uniformity of the composition of the glass plate, and the width in the stripe direction is 1.2 cm from the glass ribbon obtained by sampling the glass plate to be inspected.
  • a striated image of the side surface orthogonal to the grid direction of the photographic target glass plate the amount of light incident on the camera from each part of the side surface, and each part A streak image in which the pixel value of the pixel corresponding to is linear is photographed, the streak image is divided in the column direction, the maximum value of the pixel value in the streak image is set to MAX, the minimum value is set to MIN, and
  • the calculation of equation (1) is performed for each pixel in the store image to calculate v, and the pixel value of each pixel is set to v.
  • Each of the divided areas is shifted in the y direction so that the y-coordinates of the edge portions of the imaging target glass plate in each of the divided areas obtained by dividing the image into the divided areas in the strie image corresponding to km with the imaging target glass plate.
  • the pixel value of any coordinate (X, Y) is represented as C (X, Y)
  • the coordinate of the selected pixel is represented as (x, y)
  • T 2 ⁇ k the difference average value
  • the cut portion of the glass plate to be photographed in the glass ribbon is determined. It is characterized in that a glass plate sampled from within a predetermined range as a center is determined to be a glass plate whose composition uniformity has reached a predetermined level.
  • the glass plate manufacturing method is a glass plate manufacturing method for manufacturing a glass plate with reference to the evaluation value p calculated by the above glass plate inspection method, and the evaluation value p is determined in advance. More than the threshold value, the uniformity of the particle size of the cullet, which is the glass raw material, is increased per unit time of the stirrer that stirs the melted glass, compared to the time of manufacturing the glass plate whose evaluation value p is equal to or greater than the threshold value. By increasing at least one of increasing the number of rotations, increasing the bottom substrate discharge amount, and increasing the top substrate discharge amount, it is possible to manufacture a glass plate whose evaluation value p is less than a threshold value.
  • the present invention it is possible to provide a large and thin glass plate whose composition is more than a certain level.
  • a glass plate having a glass composition uniform to a certain level or more can be selected.
  • the uniformity of the glass composition of a glass plate can be improved.
  • Explanatory drawing which shows the magnitude
  • the block diagram which shows the structural example of the inspection apparatus of a glass plate.
  • Explanatory drawing which shows the example which samples a glass plate and a photographic subject glass plate from a glass ribbon.
  • Explanatory drawing which shows the example which plate-plates several glass plates along the advancing direction of a glass ribbon.
  • Explanatory drawing which shows the magnitude
  • the flowchart which shows the example of the process progress of evaluation value calculation.
  • Explanatory drawing which shows the imaging
  • the schematic diagram which shows the whole area
  • Explanatory drawing which shows typically the edge part of the glass plate which appears in a store image.
  • Explanatory drawing which shows the example of the result of having performed the process of step S4.
  • Explanatory drawing which shows the pixel used when calculating a difference average value.
  • the graph which shows the example of the calculation result of the root mean square of the difference average value computed for every pixel row
  • FIG. 1 is an explanatory view showing the size of the glass plate of the present invention.
  • 1 is a top view of the glass plate of the present invention
  • the diagram shown in the lower stage of FIG. 1 is a side view of the glass plate of the present invention.
  • the glass plate 1 of the present invention is a rectangular glass plate having a long side length of 1800 mm or more and a short side length of 1500 mm or more.
  • the thickness of the glass plate 1 of this invention is 0.05 mm or more and 0.7 mm or less.
  • the thickness of the glass plate 1 may be 0.1 mm or more, for example, and may be 0.3 mm or more, for example.
  • the upper limit of the thickness of the glass plate 1 of the present invention is 0.7 mm.
  • the glass plate 1 of the present invention is a glass plate whose composition uniformity satisfies a predetermined standard. Specifically, the glass plate 1 cuts out the imaging
  • the glass plate has an evaluation value indicating the saliency in the thickness direction (vertical direction) less than a predetermined value (that is, a predetermined threshold value).
  • a predetermined value that is, a predetermined threshold value
  • FIG. 2 is a block diagram illustrating a configuration example of a glass plate inspection apparatus for calculating an evaluation value of a photographing target glass plate.
  • the inspection apparatus includes an image photographing unit 5 and an image analyzing unit 6.
  • the image capturing unit 5 and the image analyzing unit 6 may be independent devices.
  • the image photographing means 5 is a camera that photographs a streak image of the side surface of the photographing glass plate.
  • the image photographing means 5 has a lens, and photographs a streak image with light incident on the lens from the side surface of the photographing target glass plate serving as a subject.
  • the image photographing means 5 may photograph a strie image by, for example, the Schlieren method.
  • the method for photographing the streak image is not limited to the schlieren method, and may be another method.
  • the image photographing means 5 may be a known means capable of photographing a streak image of a glass plate.
  • the image analysis means 6 analyzes the store image taken by the image photographing means 5 and calculates an evaluation value. In the glass plate 1 of this invention shown in FIG. 1, this evaluation value in the cut-out photography object glass plate is less than a threshold value.
  • the image analysis means 6 is realized by an information processing device such as a computer, for example.
  • evaluation value may be calculated by an apparatus other than the inspection apparatus shown in FIG. Further, a part of the processing of the image analysis means 6 described below may be performed manually by the operator.
  • the evaluation target value may be obtained by cutting out the imaging target glass plate 2 from the entire width of the glass ribbon 7 for sampling the glass plate 1, and taking a photographic image of the imaging target glass plate 2. .
  • the number of photographing target glass plates 2 cut out from the entire width of the glass ribbon 7 may not be one.
  • FIG. 3 an example in which the entire width of the glass ribbon 7 is divided and a plurality of photographing target glass plates 2 are cut out will be described.
  • FIG. 3 is an explanatory view showing an example in which the glass plate 1 and the photographing target glass plate 2 are sampled from the glass ribbon.
  • the glass ribbon 7 is manufactured by a glass ribbon manufacturing apparatus (not shown) and sequentially sent out. As shown in FIG. 3, when a plurality of photographing target glass plates 2 are cut out from the entire width of the glass ribbon 7 and evaluation values relating to the respective photographing target glass plates 2 are obtained, the evaluation values are obtained for all of the cut out photographing target glass plates 2.
  • the glass plate taken from the predetermined range 10 centered on the portion of the glass ribbon 7 from which the photographing target glass plate 2 has been cut has a higher compositional uniformity than a certain level. That is, even if the photographing target glass plate is cut out from the glass plate and the evaluation value is obtained for the photographing target glass plate, it can be said that the evaluation value is less than the threshold value.
  • the reason for this is that the time constant of the glass ribbon manufacturing apparatus is large, and even if the manufacturing conditions of the glass ribbon are changed, it takes time for the change in the manufacturing conditions to affect the uniformity of the composition of the glass ribbon 7. This is because of this.
  • the uniformity of the composition is the same for each glass plate 1 sampled from the predetermined range 10.
  • the evaluation value regarding some of the photographing target glass plates 2 of the photographing target glass plates 2 cut out from the entire width of the glass ribbon 7 is equal to or greater than the threshold value, the photographing target glass plate 2 in the glass ribbon 7 is cut off. It is determined that the glass plate sampled from the predetermined range 10 centered on the portion does not reach a certain level of composition uniformity. That is, even if an imaging target glass plate is cut out from the glass plate and an evaluation value is obtained for the imaging target glass plate, it is determined that the evaluation value is equal to or greater than a threshold value.
  • the predetermined range 10 is a portion manufactured within a range of 2 hours before and after the manufacturing time of the portion of the glass ribbon 7 where the photographing target glass plate 2 is cut.
  • the glass ribbon 7 is manufactured sequentially and sent out from the glass ribbon manufacturing apparatus, each part of the glass ribbon 7 is in a state of being manufactured when it is cured to a state where the part can be cut off. Can do.
  • FIG. 4 shows a case where P pieces of the glass plates 1 are sampled along the traveling direction of the glass ribbon 7, but the number P is, for example, in a range of 1 ⁇ P ⁇ 5.
  • the thickness of the glass ribbon 7 is manufactured in accordance with the thickness of the glass plate 1 of the present invention to be sampled. Then, apart from the glass plate 2 to be photographed, a glass plate having a long side length of 1800 mm or more and a short side length of 1500 mm or more is sampled from the glass ribbon 7.
  • the main drawing direction of the glass ribbon means not the drawing of the glass ribbon in the width direction by the guide member, but the direction of drawing along the traveling direction of the glass ribbon.
  • the main drawing direction of the glass ribbon is simply referred to as the drawing direction of the glass ribbon.
  • a streak is a line generated in the drawing direction of the glass ribbon due to fluctuations in plate thickness and waviness in a direction perpendicular to the drawing direction of the glass ribbon. Since the extending direction of the glass ribbon is the same as the traveling direction in which the glass ribbon is sent out from the glass ribbon manufacturing apparatus, all the streak direction, the stretching direction of the glass ribbon, and the traveling direction of the glass ribbon are the same.
  • FIG. 5 is an explanatory view showing the size of each photographing target glass plate 2 cut out from the entire width of the glass ribbon.
  • wire of the glass ribbon 7 is abbreviate
  • the width along the direction perpendicular to the stripe direction may be, for example, 40 cm.
  • the width along the direction perpendicular to the stripe direction is not particularly limited, and may not be 40 cm.
  • photography object glass plate 2 is equal to the plate
  • the photographing target glass plate 2 is cut from the entire width of the glass ribbon 7.
  • FIG. 6 is a flowchart showing an example of a process for calculating an evaluation value (an evaluation value indicating the saliency in the thickness direction).
  • the processes in steps S1 to S7 shown in FIG. 6 are respectively performed on all the photographing target glass plates 2 cut from the entire width of the glass ribbon 7 as illustrated in FIG.
  • the image photographing means 5 (see FIG. 2) photographs a streak image of the side surface of the photographing target glass plate cut out from the glass ribbon 7 (step S1).
  • FIG. 7 is an explanatory diagram showing the shooting direction of the streak image on the shooting target glass plate.
  • the image capturing unit 5 captures a streak image of the side surface 9 orthogonal to the direction of the stripe 103 (that is, the stripe direction) of the imaging target glass plate 2.
  • step S1 the image photographing means 5 performs the adjustment under the photographing condition adjusted so that the pixel value of each pixel is larger than the predetermined lowest gradation pixel value and smaller than the highest gradation pixel value. Then, take a story image.
  • the gradation of the pixel value of each pixel is represented by 8 bits in the photographed streak image. In this case, the pixel value of the lowest gradation is 0, and the pixel value of the highest gradation is 255.
  • the shooting conditions are adjusted in advance so that the pixel value of each pixel of the streak image is within the range of greater than 0 and less than 255 (in other words, 1 or more and 254 or less). Shoots a story image.
  • the image capturing means 5 captures the strie image in a state where the brightness of the light source is adjusted so that the pixel value of each pixel of the image falls within the range of 1 to 254.
  • the light quantity of the light source is exemplified as an adjustment target for keeping the pixel value in the range of 1 to 254.
  • the light quantity but also the exposure time, the camera gain in the image photographing means 5, the offset, etc. may be adjusted. .
  • the image photographing means 5 includes the amount of light incident on the lens 9 of the image photographing means 5 from each place on the side surface 9 (see FIG. 7) of the photographing target glass plate 2 and the streak image corresponding to each place. A streak image in which the pixel value (gradation value) of the pixel is linear is photographed.
  • FIG. 8A is a schematic diagram showing the entire region of the story image 11 obtained in step S1.
  • FIG. 8B is a schematic diagram illustrating a state where the story image illustrated in FIG. 8A is divided. In FIG. 8A and FIG. 8B, illustration of a story or the like appearing on the image is omitted.
  • the image analysis means 6 divides the store image 11 shown in FIG. 8A into a plurality of columns as shown in FIG. 8B.
  • the horizontal direction (x direction) corresponds to the plate width direction of the photographing target glass plate 2
  • the vertical direction (y direction) corresponds to the thickness direction of the photographing target glass plate 2. That is, the image analysis means 6 may divide the streak image into strips by changing the position along the plate width direction.
  • step S 3 the image analysis means 6 corrects the contrast of the store image (step S3).
  • step S ⁇ b> 3 the image analysis unit 6 performs calculation of Expression (1) below for each pixel, and resets the obtained correction value v as the pixel value of the pixel.
  • V u ⁇ 255 / (MAX-MIN) ...
  • V on the left side of Equation (1) is a new pixel value after correction.
  • “U” on the right side of Expression (1) is the pixel value of each pixel in the store image obtained in step S1. Further, “255” on the right side is the pixel value of the highest gradation that can be expressed by an 8-bit bit string that expresses the pixel value in the photographed streak image.
  • MAX is the maximum pixel value of each pixel in the store image obtained in Step S1.
  • MIN is the minimum pixel value of each pixel in the store image obtained in step S1.
  • step S2 the correction value of each pixel is calculated for each divided region.
  • the maximum value and the minimum value of the pixel value in the divided region to which the pixel belongs are used as MAX and MIN in Expression (1). May be.
  • the new pixel value v after correction calculated by Expression (1) may not be expressed by 8 bits. Further, the corrected pixel value v calculated by Expression (1) may be a value represented by a decimal.
  • FIG. 9 is an explanatory diagram schematically showing an edge portion of the photographing target glass plate 2 appearing in the streak image. Also in FIG. 9, the illustration of the stripe (striped pattern) is omitted. Edge portions (upper and lower end portions) of the photographing target glass plate 2 appear as black or white images in the streak image and are different from other portions. In the example shown in FIG. 9, in the streak image 11, the lower edge portion 12 and the upper edge portion 13 of the photographing target glass plate 2 are black or white. Although a streak appears in the region 14 corresponding to the inside of the photographing target glass plate 2, as shown above, the illustration is omitted.
  • step S4 the image analysis unit 6 detects, for example, the lower edge portion 12 in each divided region. At this time, a portion appearing as a black or white image may be detected as the edge portion 12. Then, the image analysis means 6 shifts each divided region in the thickness direction so that the y coordinates of the edge portion 12 detected from each divided region are aligned. However, there may be a black or white spot in the region 14 corresponding to the inside of the photographing target glass plate 2 as in the edge portion.
  • the image analysis means 6 causes the edge portion in either region to be erroneous. What is necessary is just to determine that it is detected and to detect another location as a location applicable to the edge part 12 again.
  • FIG. 10 shows an example of the result obtained by performing the process of step S4 on the streak image 11 illustrated in FIG.
  • the process of step S4 is a process of correcting the deflection of the photographing target glass plate 2 appearing on the streak image.
  • the thickness of the glass plate 2 to be photographed may have changed.
  • the length (number of pixels) from the lower edge portion 12 to the upper edge portion 13 may differ between the divided regions.
  • the image analysis means 6 uses the number of pixels from the lower edge portion 12 to the upper edge portion 13 in any one of the divided regions as a reference, and the lower edge portion 12 to the upper edge in each other divided region.
  • the image of each divided region may be reduced or enlarged in the thickness direction (y direction) so that the number of pixels up to the portion 13 is equal to the reference number of pixels.
  • step S4 the divided area is shifted in the thickness direction, and after aligning the y-coordinates of the edge portions as illustrated in FIG. 10, the image analysis means 6 corresponds to the image of the imaging target glass plate 2 in the processing after step S5. Processing is performed on the pixels in the region 15 to be processed.
  • a region 15 is a range from the lower edge portion to the upper edge portion.
  • the image analysis means 6 calculates the average value of the pixel value differences of a plurality of predetermined pixels existing on both sides of each pixel belonging to the region 15 (see FIG. 10) in the strie image after the process of step S4. (Step S5). Specifically, the image analysis means 6 may select individual pixels sequentially and calculate an average value of differences between pixel values of a predetermined plurality of pixels existing on both sides of the selected pixel. Hereinafter, this value is referred to as a difference average value.
  • step S5 the coordinates of the selected pixel are described as (x, y).
  • the y coordinate on one line of the selected pixel is “y + 1”
  • the y coordinate on two lines of the selected pixel is “y + 2”.
  • the y coordinate one line below the selected pixel is “y ⁇ 1”
  • the y coordinate two lines below the selected pixel is “y-2”.
  • the x coordinate of the pixel shifted to the left by the pixel corresponding to km in the photographing target glass plate 2 from the selected pixel is denoted as “x ⁇ a k ”, and the selected pixel is changed to km in the photographing target glass plate 2.
  • the x coordinate of the pixel shifted to the right by the corresponding pixel is denoted as “x + a k ”.
  • 2 ⁇ ak which is the distance between the coordinates (x ⁇ a k , y) and the coordinates (x + a k , y), corresponds to 2 ⁇ km in the photographing target glass plate 2.
  • the length in the photographing target glass plate 2 represented by the interval between two coordinates arranged in the x direction with the x coordinate of the selected pixel as the center is referred to as a pitch.
  • the above-mentioned a k may be that the distance between the coordinates of the pixels in the Sutorie image corresponding to kmm shooting target glass plate 2.
  • the pixel value of a pixel at an arbitrary coordinate (X, Y) is represented as C (X, Y).
  • a pixel value of a pixel at coordinates (x ⁇ a k , y) is denoted as C (x ⁇ a k , y).
  • the image analysis means 6 sequentially selects the value of the pitch 2 ⁇ k, and when one kind of pitch is selected, the difference average value is calculated for the selected pixel by performing the following equation (2). .
  • the difference average value when the pitch is 2 ⁇ km is denoted as T 2 ⁇ k .
  • T 2 ⁇ k ⁇ C (x ⁇ a k , y ⁇ 2) + C (x ⁇ a k , y ⁇ 1) + C (x ⁇ a k , y) + C (x ⁇ a k , y + 1) + C (x ⁇ ak , y + 2) -C (x + ak , y-2) -C (x + ak , y-1) -C (x + ak , y) -C (x + ak , y + 1) -C (x + ak , y + 2) ⁇ / 5 ...
  • FIG. 11 is an explanatory diagram illustrating pixels used when the difference average value is calculated by Expression (2).
  • the pixel 20 is a selected pixel.
  • ⁇ C (x ⁇ a k , y ⁇ 2) ⁇ C (x + a k , y ⁇ 2) ⁇ is a difference obtained by subtracting the pixel value of the pixel 30 from the pixel value of the pixel 25 illustrated in FIG. Value.
  • ⁇ C (x ⁇ a k , y ⁇ 1) ⁇ C (x + a k , y ⁇ 1) ⁇ is a difference value obtained by subtracting the pixel value of the pixel 29 from the pixel value of the pixel 24. is there.
  • ⁇ C (x ⁇ a k , y) ⁇ C (x + a k , y) ⁇ is a difference value obtained by subtracting the pixel value of the pixel 28 from the pixel value of the pixel 23.
  • ⁇ C (x ⁇ a k , y + 1) ⁇ C (x + a k , y + 1) ⁇ is a difference value obtained by subtracting the pixel value of the pixel 27 from the pixel value of the pixel 22.
  • ⁇ C (x ⁇ a k , y + 2) ⁇ C (x + a k , y + 2) ⁇ is a difference value obtained by subtracting the pixel value of the pixel 26 from the pixel value of the pixel 21.
  • the difference average is calculated by dividing the sum of these difference values by 5.
  • the difference average value T 2 ⁇ k on the left side of the equation (2) is the difference between the pixel values of the pixels 25 and 30, the difference between the pixel values of the pixels 24 and 29, the difference between the pixel values of the pixels 23 and 28, and the pixel 22 , 27 and the average value of the pixel value differences of the pixels 21, 26.
  • the image analysis means 6 selects 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, and 70 mm as the pitch. Then, the image analysis means 6 calculates the formula (2) for each coordinate at each pitch, and calculates the difference average value.
  • the image analysis means 6 selects each pixel and performs the following calculation for the selected pixel (x, y).
  • T 10 ⁇ C (x ⁇ a 5 , y ⁇ 2) + C (x ⁇ a 5 , y ⁇ 1) + C (x ⁇ a 5 , y) + C (x ⁇ a 5 , y + 1) + C (x ⁇ a 5) , y + 2) -C (x + a 5, y-2) -C (x + a 5, y-1) -C (x + a 5, y) -C (x + a 5, y + 1) -C (x + a 5, y + 2) ⁇ / 5
  • Image analysis means 6 selects 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, and 70 mm as the pitch in addition to 10 mm, and performs the same processing.
  • step S5 the image analysis means 6 calculates the difference average value calculated in step S5 for each pixel column for each pitch (10, 20, 30, 40, 50, 60, 70 mm) selected in step S5.
  • the mean square is calculated, and the mean value of the mean square values calculated for each pixel column is calculated (step S6). Since this calculation is performed for each pitch, in step S6, values are obtained for seven types of pitches.
  • the root mean square calculated for each pixel column in step S6 is a value obtained by obtaining for each pixel column the index value of the absolute value of the difference average value calculated in step S5. That this value is large means that the difference between the pixel values of the pixels on both sides of the pixel column is large, and a strage in the thickness direction appears remarkably.
  • FIG. 12A is a graph showing an example of a square average calculation result of a difference average value calculated for each pixel column when the pitch is 10 mm.
  • FIG. 12B is a graph illustrating an example of the calculation result of the mean square of the difference average value calculated for each pixel column when the pitch is 20 mm.
  • FIG. 12C is a graph illustrating an example of a calculation result of the root mean square of the difference average value calculated for each pixel column when the pitch is 70 mm.
  • FIG. 12D is a schematic diagram schematically showing a store image that is the basis of the calculation results of FIGS. 12A, 12B, and 12C.
  • the root mean square value is large in the pixel columns near the 70th to 90th pixels from the left (see FIGS. 12A and 12B). This means that finely spaced streaks appear in the vicinity of the 70th to 90th pixel columns from the left, as shown in FIG. 12D.
  • the pitch is 70 mm
  • the root mean square value is large in the pixel rows near the 670th to 730th from the left (see FIG. 12C). This means that, as shown in FIG. 12D, a streak having a rough interval appears in the vicinity of the 670th to 730th pixel columns from the left.
  • step S6 the image analysis means 6 calculates the average value of the values calculated for each pixel column (root mean square of the difference average value), so that the vertical axis in the graphs illustrated in FIGS. 12A to 12C is displayed. Find the average value. 12A, 12B, and 12C illustrate three types of pitch graphs. As described above, the image analysis unit 6 calculates the average value for each of the seven types of pitches.
  • FIG. 12D for the sake of simplicity, only the streak having a fine interval in the vicinity of the 70th to 90th pixel columns from the left and the streak having a rough interval in the vicinity of the 670th to 730th pixel columns from the left are schematically illustrated. Is shown. In an actual story image, the story is observed throughout the image. The more the composition of the glass plate 2 to be photographed is, the stronger the contrast of the streak appears, and the streak is noticeably observed.
  • step S6 after calculating values (average values of mean squares calculated for each pixel column) for each of the seven types of pitches, the image analysis means 6 weights each value calculated for the seven types of pitches. The coefficients are multiplied and the sum of the multiplication results is calculated (step S7). This calculation result is an evaluation value (an evaluation value indicating the saliency in the thickness direction). If the evaluation value is p, in step S7, the image analysis means 6 calculates the following equation (3).
  • p 1 is the calculated result of step S6 with respect to the pitch 10 mm.
  • p 2 is the calculation result of step S6 with respect to the pitch 20 mm.
  • p 3 is the calculation result of step S6 with respect to the pitch 30 mm.
  • p 4 is the calculation result of step S6 with respect to the pitch 40 mm.
  • p 5 is the calculation result of step S6 with respect to the pitch 50 mm.
  • p 6 is the calculation result of step S6 with respect to the pitch 60 mm.
  • p 7 is the calculation result of step S6 with respect to the pitch 70 mm.
  • a is a weighting factor to be multiplied by the p 1, in this embodiment, is "0.045”.
  • b is a weight coefficient to be multiplied by the p 2, in this embodiment, is “0.056”.
  • c is a weighting coefficient to be multiplied by the p 3, in this embodiment, is “0.057”.
  • d is a weighting factor to be multiplied by the p 4, in this embodiment, is "0.064”.
  • e is a weight coefficient to be multiplied by the p 5, in this embodiment, is "0.062”.
  • f is a weighting factor to be multiplied by the p 6, in this embodiment, is "0.074”.
  • g is a weight coefficient to be multiplied by the p 7, in this embodiment, is "0.088”.
  • the expression (3) can be expressed more specifically as follows.
  • steps S1 to S7 are performed for all the glass sheets to be photographed cut from the entire width of the glass ribbon, the evaluation value p is obtained for each of the glass sheets to be photographed.
  • the image analysis unit 6 calculates each evaluation value calculated for each photographing target glass plate.
  • the uniformity of the composition of the glass plate sampled from the range 10 (see FIG. 3) of the glass ribbon 7 is evaluated by comparing p with a predetermined threshold value. If the evaluation values p of all the photographing target glass plates are all less than the threshold value, the image analysis means 6 has a high uniformity of the composition of the glass plates taken from the range 10 of the glass ribbon 7 to a certain level or higher. judge.
  • the uniformity of the composition of the glass plates sampled from the range 10 of the glass ribbon 7 is a certain level. It is determined that it has not reached.
  • the image analysis unit 6 performs two steps before and after the manufacturing time of the cut portion of the photographing target glass plate 2 in the glass ribbon 7.
  • the glass composition uniformity is selected (determined) as having reached a certain level.
  • the plurality of glass plates 1 sampled from the range 10 of the glass ribbon manufactured in the range of 2 hours before and after the time of manufacture of the cut-out portion of the glass plate 2 to be photographed are selected as non-defective products (step S8).
  • step S8 if it is determined in step S8 that the evaluation value p is greater than or equal to the threshold value for some of the shooting target glass plates, the image analysis means 6 takes the shooting target glass plate in the glass ribbon 7.
  • the glass composition uniformity is selected as not reaching a certain level. (judge. That is, the plurality of glasses 1 are selected as non-defective products.
  • the threshold used in step S8 is set to 6.
  • the threshold may be set to 4 if a glass plate with higher composition uniformity is selected. That is, when the threshold value is set to 4, the glass plate having higher composition uniformity can be selected than when the threshold value is set to 6. Further, the threshold may be set to 2. By setting the threshold value to 2, a glass plate having a higher composition uniformity can be selected.
  • a glass plate to be photographed having a width of 1.2 cm along the streak direction is cut, and step When an evaluation value is obtained by performing the same processing as S1 to S8, the evaluation value is also less than the threshold value.
  • the present invention it is possible to provide a large and thin glass plate having a uniform composition over a certain level.
  • the large size means that the length of the long side is 1800 mm or more and the length of the short side is 1500 mm or more.
  • the glass plate has a thickness of 0.05 to 0.7 mm.
  • the glass plate having a glass composition uniform to a certain level or more can be selected by the inspection method of the present invention.
  • That the evaluation value is less than the threshold means that the uniformity of the composition of the glass plate is a certain level or more, and the glass ribbon may be manufactured so as to improve the uniformity of the composition.
  • the glass plate of this invention can be sampled from the glass ribbon manufactured by these methods.
  • the first method for improving the uniformity of the glass is to limit the particle size of the cullet mixed with the batch material of the glass ribbon to a certain range.
  • the particle size of the cullet may be limited to 0.5 mm or less and 5% or less and 10 mm or less and 75% or more by weight%.
  • a sieve classifier when the particle size of the cullet mixed with the batch raw material is limited, for example, a cullet having a desired particle size range is classified by a sieve classifier, and the cullet is mixed with the batch raw material to produce a glass ribbon. That's fine.
  • FIG. 13 is a schematic view schematically showing a glass melting tank and a conveying tube in the glass ribbon manufacturing apparatus.
  • the molten glass conveying tube 42 is a tubular member for sending the glass melted in the glass melting tank 41 to the next step.
  • a stirrer (stirring device) 43 may be provided in the transport pipe 42 and the melted glass sent from the glass melting tank 41 to the next process may be stirred with the stirrer 43.
  • the stirring speed of the stirrer may be 4 to 7 rpm, for example, under a predetermined stirring performance. In the case where the second method is not adopted, the stirrer 43 may not be provided.
  • FIG. 14 is an explanatory view showing a stirrer in the transport pipe 42.
  • the stirrer 43 includes a rotating body 63 and blades 62.
  • the rotating body 63 has a cylindrical shape, and the blades 62 are provided on the side surfaces of the rotating body 63.
  • four blades 62 are illustrated, but the number of blades 62 is not limited to four.
  • the height from the bottom surface of the rotating body 63 to the mounting position of each blade 62 may be different depending on the position on the side surface of the rotating body 63.
  • a driving shaft 66 is provided on the upper surface 67 of the rotating body 63, and the rotating body 63 is driven to rotate about the central axis 61 by the driving shaft 66. As a result, the glass flowing in the transport pipe 42 is agitated by the blades 62 of the rotating body 63.
  • FIG. 14 illustrates a case where the central axis 61 of the rotating body 63 and the central axis of the transport pipe 42 coincide with each other. Therefore, in the example shown in FIG. 14, the central axis 61 of the stirrer 43 and the glass flow direction are parallel.
  • the upstream surface 67 of the rotating body is referred to as the upper surface.
  • the area of the upper surface 67 of the rotating body 63 includes a portion where the drive shaft 66 is provided. That is, the area of the upper surface 67 is equal to the bottom area of the rotating body 63.
  • the conveyance tube 42 may be formed to be bent in an L shape, and the drive shaft 66 may be extended from the wall surface of the bent portion.
  • the area of the region 65 obtained by orthogonally projecting the region through which the blades 62 pass by the rotation of the stirrer 43 onto the plane including the upper surface 67 of the rotator 63 and the area of the upper surface 67 of the rotator 63
  • the sum is defined as the stirring area.
  • the unit of the stirring area A 1 is “m 2 ”.
  • a value obtained by subtracting the area of the upper surface 67 of the rotating body 63 from the cross-sectional area of the transport pipe 42 is defined as a glass channel area, and the channel area is denoted as A0.
  • the unit of A 0 is “m 2 ”.
  • the flow path area A 0 is the area of the region 64 obtained by orthogonally projecting the region in which the rotating body 63 and the blades 62 do not pass even when the stirrer 43 rotates to the plane including the upper surface 67 of the rotating body 63, This is the sum of the area 65.
  • the rotation speed of the stirrer 43 is set to V a [rad / s].
  • the number of blades 62 included in the stirrer 43 is N.
  • the viscosity of the glass flowing in the conveyance tube 42 is ⁇ [N ⁇ s / m 2 ].
  • V g [m / s] be the flow velocity of the glass flowing in the transport pipe 42.
  • the performance value E representing the stirring performance of the stirrer is expressed as the following equation (4).
  • E the value of E calculated by Equation (4), the more the homogeneity of the glass can be improved by stirring with a stirrer. That is, it can be said that the larger the E, the higher the stirring performance of the stirrer.
  • the stirring rotation speed of the stirrer may be set to 4 to 7 rpm, for example.
  • a third method for improving the uniformity of the glass is to discharge the bottom substrate in the molten glass.
  • the bottom substrate is a heterogeneous substrate in the melted glass and accumulates in the lower layer of the melted glass. After discharging the bottom substrate after the glass melting step in the glass melting tank 41, the uniformity of the composition of the glass ribbon can be improved by performing the subsequent steps.
  • a bottom substrate discharge unit 44 may be provided at the lower portion of the transport tube 42, and the glass base material passing through the transport tube 42 may be discharged from the bottom substrate discharge unit 44.
  • the discharge amount of the bottom substrate may be, for example, 10% or less of the molten glass discharged from the glass melting tank 41. If the third method is not employed, the bottom substrate discharge unit 44 need not be provided.
  • a fourth method for improving the uniformity of the glass is to discharge the upper substrate in the molten glass.
  • the upper substrate is a heterogeneous substrate in the molten glass and accumulates in the upper layer of the molten glass. After discharging the upper substrate after the glass melting step in the glass melting tank 41, the uniformity of the composition of the glass ribbon can be improved by performing the subsequent steps.
  • an upper substrate discharge portion 45 may be provided on the upper portion of the transfer tube 42, and the glass upper substrate passing through the transfer tube 42 may be discharged from the upper substrate discharge portion 45.
  • the discharge amount of the upper substrate may be, for example, 10% or less of the molten glass discharged from the glass melting tank 41. If the fourth method is not employed, the upper substrate discharge unit 45 need not be provided.
  • the glass plate whose evaluation value p is less than the threshold value by the following glass plate manufacturing method Can be manufactured. That is, it is possible to increase the uniformity of the particle size of the cullet, which is a glass raw material, and to increase the number of revolutions per unit time of the stirrer that stirs the melted glass, compared to the time when the evaluation value p is equal to or greater than the threshold value. What is necessary is just to manufacture the glass plate from which evaluation value p becomes less than a threshold value by performing at least one of increasing a base substrate discharge
  • Such a glass plate manufacturing method can improve the uniformity of the glass composition of the glass plate.
  • the inventor manufactured a glass ribbon by the first method. That is, the glass ribbon was manufactured by limiting the particle size of the cullet mixed with the batch raw material to a certain range. The particle size of the cullet was limited to a range of 0.5 mm or less and 5% or less, and 10 mm or less and 75% or more by weight%. The cullet having such a particle size was obtained by classifying the cullet using a sieve classifier.
  • FIG. 15 is an explanatory view showing a glass plate taking mode in each embodiment.
  • a glass ribbon 7 As shown in FIG. 15, and Toita the glass plates 51 L from the left side portion of the glass ribbon 7, and Toita the glass plate 51 C from the central portion, the glass plate 51 R of the right side portion Plated.
  • the photographing target glass plates having a width of 1.2 cm along the streak direction were cut out from the three glass plates. .
  • the width in the direction perpendicular to the streaks in the imaging target glass plate was 40 cm.
  • the processing of steps S1 to S8 was performed on the three glass sheets to be photographed, and the evaluation value p was calculated.
  • Example 1 as shown in Table 1, the evaluation values of the imaging target glass plates cut from the three glass plates 51 L , 51 C , 51 R are “5.74”, “5.33”, “ The average value was “4.64”. Thus, for each of the three glass plates, the evaluation value p of the imaging target glass plate was less than the threshold value 6, and the composition uniformity of the glass plate was good.
  • the inventor adopted the first method and the second method described above to produce a glass ribbon. Specifically, only cullet having a particle size in the range of 0.5% or less and 5% or less in the range of 0.5% to 10% is mixed with the batch raw material and melted, and melted glass from the glass melting tank 41 (see FIG. 13).
  • the stirrer 43 (see FIG. 13) was rotated in the transport pipe 42 for transporting the molten glass, and the molten glass was stirred.
  • the rotation speed of the stirrer 43 was set to 4 to 7 rpm after satisfying E> 20. Note that the third and fourth methods described above were not adopted. In other words, the bottom substrate and the top substrate were not discharged.
  • the glass plates 51 L , 51 C and 51 R were sampled from the left part, the central part and the right part of the glass ribbon in the same manner as in Example 1 (see FIG. 15). Furthermore, each of the three glass plates was cut out a subject glass plate having a width of 1.2 cm along the line direction. The size of the photographing target glass plate is the same as that of the first embodiment. Then, the processing of steps S1 to S8 was performed on the three glass sheets to be photographed, and the evaluation value p was calculated.
  • Example 2 the evaluation value p of the photographing target glass plate cut from the three glass plates 51 L , 51 C , 51 R is “2.90”, “1.92”, and “5.96”. The average value was “3.59” (see Table 1). Thus, for each of the three glass plates, the evaluation value p of the imaging target glass plate was less than the threshold value 6, and the composition uniformity of the glass plate was good. Moreover, compared with Example 1, the average value of the evaluation value p is a smaller value, and it can be considered that the uniformity of the composition is improved as a whole.
  • the inventor manufactured the glass ribbon by adopting the first, second and third methods. Specifically, only cullet having a particle size of 0.5% or less and 5% or less within a range of 10% or less and 75% or more is mixed and dissolved in the batch raw material, and the molten glass is melted from the glass melting tank 42 (see FIG. 13).
  • the stirrer 43 (see FIG. 13) was rotated in the transport pipe 42 for transporting the molten glass, and the molten glass was stirred. Furthermore, the bottom of the molten glass was discharged from the transport pipe 42.
  • the rotation speed of the stirrer 43 was set to 4 to 7 rpm so that E> 20 was established, and the discharge amount of the bottom substrate was set to 10% of the molten glass discharged from the glass melting tank 41. Further, the fourth method was not adopted. In other words, the upper substrate was not discharged.
  • the glass plates 51 L , 51 C and 51 R were sampled from the left part, the central part and the right part of the glass ribbon in the same manner as in Example 1 (see FIG. 15). Furthermore, each of the three glass plates was cut out a subject glass plate having a width of 1.2 cm along the line direction. The size of the photographing target glass plate is the same as in the first and second embodiments. Then, the processing of steps S1 to S8 was performed on the three glass sheets to be photographed, and the evaluation value p was calculated.
  • Example 3 it implemented twice.
  • the evaluation values p of the subject glass plates cut from the glass plates 51 L , 51 C and 51 R at the first time are “2.94”, “2.53” and “1.76”, and the average value thereof is It was “2.41” (see Table 1).
  • the evaluation values p of the photographing target glass plates cut from the glass plates 51 L , 51 C , 51 R in the second time are “2.22”, “2.53”, “2.15”, and the average The value was “2.30” (see Table 1).
  • the evaluation value p of each photographing target glass plate was less than the threshold value 6 and the composition uniformity of the glass plate was good.
  • the average value of evaluation value p is a smaller value, and it can be said that the uniformity of a composition is improving by discharge
  • the inventor manufactured the glass ribbon by employing each of the first to fourth methods. Specifically, only cullet having a particle size in the range of 0.5% or less and 5% or less in the range of 0.5% to 10% is mixed with the batch raw material and melted, and melted glass from the glass melting tank 41 (see FIG. 13).
  • the stirrer 43 (see FIG. 13) was rotated in the transport pipe 42 for transporting the molten glass, and the molten glass was stirred. Furthermore, the bottom substrate and the top substrate of the molten glass were discharged from the transport pipe 42, respectively.
  • the rotation speed of the stirrer 43 was set to 4 to 7 rpm so that E> 20 was established, and the discharge amount of the bottom substrate was set to 10% of the molten glass discharged from the glass melting tank 41. In addition, the discharge amount of the upper substrate was set to 1/3 of the discharge amount of the lower substrate.
  • the glass plates 51 L , 51 C and 51 R were sampled from the left part, the central part and the right part of the glass ribbon in the same manner as in Example 1 (see FIG. 15). Furthermore, each of the three glass plates was cut out a subject glass plate having a width of 1.2 cm along the line direction. The size of the glass plate to be photographed is the same as in Examples 1 to 3. Then, the processing of steps S1 to S8 was performed on the three glass sheets to be photographed, and the evaluation value p was calculated.
  • Example 4 it was carried out twice.
  • the evaluation values p of the subject glass plates cut from the first glass plates 51 L , 51 C , 51 R are “1.37”, “1.81”, “0.74”, and the average value thereof is It was “1.31” (see Table 1).
  • the evaluation values p of the photographing target glass plates cut from the glass plates 51 L , 51 C , 51 R in the second time are “1.38”, “1.09”, “0.63”, and the average The value was “1.03” (see Table 1).
  • the evaluation value p of each photographing target glass plate was less than the threshold value 6 and the composition uniformity of the glass plate was good.
  • the average value of the evaluation value p is smaller, and it can be said that the uniformity of the composition is improved by discharging the upper substrate.
  • FIG. 16 shows an example of a streak image for the entire width of the glass ribbon manufactured in the comparative example.
  • the story image shown in FIG. 16 is an image in which the story images taken with respect to each photographing target glass plate cut out from the entire width of the glass ribbon are connected.
  • the evaluation value p of the photographing target glass plate cut from each of the glass plates 51 L , 51 C , 51 R is “9.32”, “4.43”, “9.49”, and the average value thereof. Was “7.75”.
  • the evaluation value p may be less than 6, but the evaluation value as a whole becomes large. In comparison, it can be considered that the uniformity of the composition is low.
  • the present invention can be applied to various products using large and thin glass plates and requiring high uniformity with respect to the composition of the glass plates.

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Abstract

La présente invention concerne une plaque de verre mince et de grandes dimensions ayant une composition qui est uniforme à un certain niveau et au-delà. Une image de stries d'une surface latérale d'un sujet d'imagerie de plaque de verre désigné découpé à partir d'une plaque de verre est capturée, l'image de stries est verticalement séparée, le contraste est corrigé, et une zone séparée est déplacée dans la direction de l'axe y de sorte que la coordonnée y d'une partie de bord du sujet d'imagerie de plaque de verre soit alignée dans chaque zone séparée. Ensuite, chaque pixel est sélectionné, une différence moyenne qui est la moyenne de la différence entre des valeurs de pixel d'une pluralité désignée d'ensembles de pixels présents sur les deux côtés des pixels sélectionnés est calculée, la moyenne quadratique de la différence moyenne est calculée pour chaque rangée de pixels, et de plus, la moyenne de la moyenne quadratique de chaque rangée de pixels est calculée. À ce stade, la façon de déterminer la pluralité d'ensembles de pixels désignés est modifiée pour effectuer le même calcul. Ensuite, la valeur dérivée de chaque résultat de calcul est multipliée par un facteur de pondération, et la somme des résultats de multiplication est calculée. En ce qui concerne la plaque de verre de la présente invention, ce résultat de calcul est au-dessous d'un seuil prédéfini.
PCT/JP2011/077590 2010-12-15 2011-11-29 Plaque de verre, procédé pour inspecter une plaque de verre, et procédé pour fabriquer une plaque de verre Ceased WO2012081398A1 (fr)

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CN2011800602937A CN103261104A (zh) 2010-12-15 2011-11-29 玻璃板、玻璃板的检查方法、及玻璃板的制造方法
JP2012548718A JPWO2012081398A1 (ja) 2010-12-15 2011-11-29 ガラス板、ガラス板の検査方法、およびガラス板の製造方法

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CN107437242A (zh) * 2017-09-13 2017-12-05 蚌埠凯盛工程技术有限公司 一种玻璃带漂移及板宽视觉检测方法
CN107437242B (zh) * 2017-09-13 2023-05-05 蚌埠凯盛工程技术有限公司 一种玻璃带漂移及板宽视觉检测方法
CN115228334A (zh) * 2022-07-07 2022-10-25 河北光兴半导体技术有限公司 玻璃基板产线料道搅拌内流场模拟装置及模拟系统
CN115228334B (zh) * 2022-07-07 2024-03-29 河北光兴半导体技术有限公司 玻璃基板产线料道搅拌内流场模拟装置及模拟系统
CN117585476A (zh) * 2024-01-19 2024-02-23 中储粮成都储藏研究院有限公司 一种粮食入仓自动对准窗户的方法及系统
CN117585476B (zh) * 2024-01-19 2024-04-16 中储粮成都储藏研究院有限公司 一种粮食入仓自动对准窗户的方法及系统

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