KR101935979B1 - Plate glass inspection device, plate glass inspection method, plate glass manufacturing device, and plate glass manufacturing method - Google Patents
Plate glass inspection device, plate glass inspection method, plate glass manufacturing device, and plate glass manufacturing method Download PDFInfo
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- KR101935979B1 KR101935979B1 KR1020147002925A KR20147002925A KR101935979B1 KR 101935979 B1 KR101935979 B1 KR 101935979B1 KR 1020147002925 A KR1020147002925 A KR 1020147002925A KR 20147002925 A KR20147002925 A KR 20147002925A KR 101935979 B1 KR101935979 B1 KR 101935979B1
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- plate glass
- glass
- defect candidate
- defect
- plate
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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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- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
Provided is a glass plate inspecting apparatus which inspects continuously occurring glass defects while increasing the inspection speed while ensuring necessary inspection accuracy and suppressing the apparatus cost without complicating the structure of the apparatus. A defect inspection apparatus for inspecting a plurality of plate glasses, comprising: a detector for detecting a defect candidate range of a first plate glass and a defect candidate range of a second plate glass different from the first plate glass; A defective candidate range position of the second plate glass, and determining whether or not there is a defect continuing to the first plate glass and the second plate glass based on the comparison result.
Description
The present invention relates to a plate glass inspection apparatus, a plate glass inspection method, a plate glass manufacturing apparatus, and a plate glass manufacturing method used for inspecting plate glass, and more particularly, to a technique for more accurately detecting defects continuously occurring.
In recent years, thin flat panel displays have become widespread, among which the number of liquid crystal displays is the largest. Most of the substrate glass for liquid crystal used in the liquid crystal display is produced by the overflow down-draw method.
According to the overflow down-draw method, it is possible to form a nano-level smooth surface without polishing, so that a high-quality plate glass can be produced. However, defects may occur in the plate glass due to, for example, insufficient melting of the glass raw material, incorporation of foreign materials, deterioration of the apparatus, and variations in molding conditions.
Glass defects include, for example, defects (such as a knot, a malt (also referred to as a cord) and bubbles (also referred to as a seed or a blister)) caused by the inclusion of a foreign substance or a lack of dissolution of a glass raw material, (Wave, stripes, open pores, irregularities and flaws). In particular, it is necessary to accurately detect as much as possible at the early stage of plate glass molding and to feed back the detection results to the molding process since the occurrence of the malleies is continuous and the causes of the occurrence vary.
Here, Patent Literatures 1 to 4 disclose an apparatus for detecting glass defects such as fines by receiving light rays transmitted through a plate glass.
The apparatuses described in Patent Documents 1 to 4 still have room for improvement in inspection accuracy, inspection speed, apparatus cost, and the like.
For example, Patent Document 2 discloses "In order to reliably detect fine defects on a continuous plate glass surface, three inspection apparatuses are arranged in parallel and one sheet glass is inspected simultaneously using three inspection apparatuses, Can achieve a high detection rate and high productivity despite the simple construction "(paragraph 0083 of Patent Document 2).
However, in the plate glass defect inspection apparatus described in Patent Document 2, since the same inspection apparatuses are provided in parallel to inspect a single sheet glass at the same time, the apparatus configuration becomes complicated and the apparatus cost becomes high.
Simply increasing the number of inspection devices generally improves inspection accuracy and inspection speed. However, it is very useful if it is possible to improve inspection accuracy and inspection speed without increasing the number of inspection devices.
An object of the present invention is to provide a method of inspecting glass defects such as spots which are generated continuously in a plurality of plate glasses at the time of molding a plate glass without reducing the cost of the apparatus without complicating the structure of the apparatus, And to provide a plate glass inspection apparatus, a plate glass inspection method, a plate glass manufacturing apparatus, and a plate glass manufacturing method which can improve the inspection speed.
In order to attain the above object, a plate glass inspection apparatus according to the present invention is a plate glass inspection apparatus for inspecting a plurality of plate glasses, wherein a defect candidate range of a first plate glass and a defect candidate range of a second plate glass different from the first plate glass are detected A defect candidate range position of the first plate glass and a defect candidate range position of the second plate glass are compared with each other and a presence or absence of a defect continuing to the first plate glass and the second plate glass is judged And a judging unit for judging
Here, in the plate glass inspection apparatus, the detection unit may include a photographing unit and an operation unit, and the photographing unit may introduce an image on the first sheet glass and the second sheet glass, It is preferable to extract the defect candidate portion based on the defect candidate portion and set the defect candidate range such that the defect candidate range is larger than the defect candidate portion.
Here, in the plate glass inspecting apparatus, the first plate glass and the second plate glass are plate glass formed by drawing a plate glass in a predetermined direction, and the detecting unit may detect a part of the first plate glass and the second plate glass, It is preferable to inspect a part of the first plate glass and the entire range of the first plate glass and the entire range of the second plate glass with respect to a direction orthogonal to the predetermined direction.
The conveying unit conveys the first sheet glass and the second sheet glass in the orthogonal direction with respect to the predetermined direction. The conveying unit conveys the first sheet glass and the second sheet glass to a fixing position of the conveying path of the first sheet glass and the second sheet glass, And a photographing unit for taking in an image of the image.
Here, in the plate glass inspection apparatus, it is preferable that the carry section includes a pulse output section for outputting a pulse according to the movement amount of the plate glass, and the photographing section introduces an image in accordance with the pulse.
In order to achieve the above object, a plate glass inspection method according to the present invention is a plate glass inspection method for inspecting a plurality of plate glasses, wherein a defect candidate range of a first plate glass and a defect candidate range of a second plate glass different from the first plate glass are detected A defective candidate range position of the first plate glass and a defective candidate range position of the second plate glass are compared with each other, and the presence or absence of a defect continuing to the first plate glass and the second plate glass And a judgment step of judging the judgment result.
In order to attain the above object, a plate glass manufacturing apparatus according to the present invention for manufacturing a plurality of plate glasses includes a first plate glass, a molding unit for molding a second plate glass different from the first plate glass, A defective candidate range position of the first plate glass and a defective candidate range position of the second plate glass are compared with each other based on the comparison result, And determining whether there is a defect continuing to the first plate glass and the second plate glass.
In order to achieve the above object, a method of manufacturing a plate glass according to the present invention is a method for manufacturing a plurality of plate glasses, comprising the steps of: forming a first plate glass and a second plate glass different from the first plate glass; A defect candidate range of the first plate glass and a defect candidate range position of the second plate glass are compared with each other and a defect candidate range of the first plate glass is compared with a defect candidate range position of the second plate glass, And determining whether there is a defect continuing to the first plate glass and the second plate glass.
When two plate glasses are inspected by the constitution of the plate glass inspection device, the plate glass inspection method, the plate glass manufacturing device and the plate glass manufacturing method described in the means for solving the problems and the defect candidate positions of the two sheet glasses are matched or close to each other It can be judged that the defect is a continuous defect in two sheets of glass. Therefore, in the inspection of glass defects such as spots which are generated continuously in a plurality of plate glasses at the time of forming the plate glass, it is possible to improve the inspection accuracy at the time of judging whether or not the plate glass is defective as compared with the case of individually inspecting the plate glass.
As a result, the device cost can be suppressed without complicating the device configuration.
Further, when the number of inspection apparatuses is increased, the inspection accuracy and the inspection speed can be improved as compared with the prior art.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram schematically showing an outline of conveyance and image introduction of a plate glass to be inspected. Fig.
Fig. 2 is a schematic view of a plate glass inspection apparatus according to the first embodiment; Fig.
3 is a diagram for explaining a defect candidate portion judging method in an arithmetic section;
4 is a diagram showing a relationship between a defect candidate portion and a defect candidate range;
5 is a flowchart showing an outline of an inspection process;
Fig. 6 is a schematic view of an apparatus for manufacturing a plate glass according to Modification 1. Fig.
[First Embodiment]
<Overview>
In the first embodiment, a glass plate inspection apparatus for detecting glass defects continuously generated in a forming direction of a plate glass (hereinafter referred to as "drawing direction of plate glass") is shown. In the plate glass inspection apparatus according to the first embodiment, two plate glass images are introduced, and when the positions of defect candidates existing in two plate glass images coincide with each other or are close to each other, the defect candidates of the two plate glasses are regarded as glass defects .
<Configuration>
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram schematically showing an outline of conveyance and image introduction of a plate glass to be inspected. FIG.
As shown in Fig. 1, the
Then, the
A
When the
Therefore, the
In the present embodiment, the number of pixels of one line introduced by the
2 is a diagram schematically showing the plate
The plate
The
The
The photographing
The photographing
In addition, since the position where the
The
The
Since the image data introduced by the photographing
Then, the
Next, the
3 is a diagram for explaining a defect candidate portion judging method of the calculating
3 shows a line indicating the level of one-dimensional data converted using the data conversion program. In FIG. 3, four threshold values of the + side
The
The calculating
If the defect to be detected is less bent, the
4 is a diagram showing the relationship between a defect candidate portion and a defect candidate range.
4 shows a
In the present embodiment, the width of the
The
If there is a plurality of defect candidates and a defect candidate range calculated based on each defect candidate portion is adjacent to each other, two adjacent defect candidate ranges are treated as one defect candidate range.
Subsequently, the
In the present embodiment, the
In the present embodiment, the detecting
Next, the
The
The
The
The
In the defect candidate range, the degree of defect of the defect candidate such as whether it is a defect candidate or a warning candidate is recognized by the
The comparison result by the
In this embodiment, the judging
The plate
<Control method>
5 is a flowchart showing the outline of the inspection process. The outline of the inspection process will be described below with reference to Figs. 1, 2, and 5. Fig.
(1) The photographing
(2) The photographing
(3) The photographing
(4) The introduction of the image is continued until the plate glass is conveyed backward by a predetermined distance from the image introduction position (step S4).
(5) When the introduction of the image is completed (step S4: NO), the
(6) The calculating
(7) The
(8) The calculating
(9) The
(10) When the comparing
(11) If the defect candidate range is calculated (step S10: YES), the
(12) The comparing
(Step S12: YES), the comparing
(Step S13: YES), the
[Modified Example 1]
<Overview>
Modified Example 1 shows a plate glass manufacturing apparatus equipped with the plate glass inspection apparatus according to the first embodiment.
<Configuration>
6 is a diagram schematically showing an
The plate
In the plate
The
<Summary>
As described above, according to the plate glass inspection apparatus of the first embodiment and the plate glass manufacturing apparatus of the first modification, images of two sheet glass plates formed in order are introduced, and the position of each defect candidate existing in two sheet glass images is It is possible to judge that the defect candidate of the two sheet glass is a glass defect. Therefore, compared with the case of inspecting an object to be inspected one by one in the inspection of glass defects such as spots which are generated continuously in a plurality of plate glasses at the time of molding the plate glass, the inspection accuracy at the time of judging whether the defect is defective can be increased have.
In addition, when the number of inspection apparatuses is increased, the inspection accuracy and the inspection speed can be improved as compared with the prior art.
INDUSTRIAL APPLICABILITY The present invention can be applied to inspections of glass defects such as spots which are generated continuously in a plurality of glass sheets during molding of glass sheets.
According to the present invention, it is possible to increase the inspection accuracy at the time of determining whether or not a defect is a defect without complicating the device configuration, and thus the value of industrial use is very high.
10: molding device 11: continuous plate glass
12: cutter 13: plate glass
14: Mali defect 15:
16: light source 17: line camera
18: Shooting point 19: Camera view
100: plate glass inspection device 110: detection part
111: conveying section 112: photographing section
113: Operation unit 114: Pulse output unit
120: Judgment section 121:
122: comparison unit 123: defect recognition unit
200: plate glass manufacturing apparatus 201: forming section
Claims (8)
A defect candidate range of the first plate glass and a defect candidate range of the second plate glass different from the first plate glass;
And a determination unit that determines that there is a defect continuing to the first plate glass and the second plate glass when there is a range in which the defect candidate range position of the first plate glass overlaps the defect candidate range position of the second plate glass ,
Wherein the detecting unit includes a photographing unit and a calculating unit,
Wherein,
Introducing an image on the first sheet glass and the second sheet glass,
The operation unit,
And a defective candidate region extracting means for extracting a defect candidate portion based on the image introduced by the photographing section and enlarging the defect candidate portion in the glass width direction so as to make the defect candidate region larger than the defect candidate portion, Plate glass inspection system.
Wherein the first plate glass and the second plate glass are plate glass formed by drawing a plate glass in a predetermined direction,
Wherein,
Taking a part of the first plate glass and a part of the second plate glass with respect to the predetermined direction,
And the entire range of the first plate glass and the entire range of the second plate glass are photographed with respect to a direction orthogonal to the predetermined direction.
And a conveying section for conveying the first plate glass and the second plate glass in the orthogonal direction with respect to the predetermined direction,
Wherein the photographing unit introduces an image at a fixed position in a conveying path of the first and second sheets of glass.
Wherein the conveying unit includes a pulse output unit for outputting a pulse corresponding to a movement amount of the plate glass,
Wherein the photographing unit introduces an image in accordance with the pulse.
Wherein the calculation unit calculates the one-dimensional data corresponding to the glass width direction, detects a glass end from the one-dimensional data, and excludes a portion outside the glass range from the one-dimensional data, And sets the defect candidate range based on the extracted one-dimensional data.
A detecting step of detecting a defect candidate range of the first plate glass and a defect candidate range of the second plate glass different from the first pane glass;
And a determination step of determining that there is a defect continuing from the first plate glass and the second plate glass when there is a range in which the defect candidate range position of the first plate glass overlaps the defect candidate range position of the second plate glass and,
Wherein the detecting step comprises:
Introducing an image on the first sheet glass and the second sheet glass;
Extracting a defect candidate portion based on the introduced image and setting the defect candidate range by enlarging the defect candidate portion in the glass width direction so that the defect candidate range is larger than the defect candidate portion; Method of inspecting plate glass.
A molding unit for molding a first plate glass, a second plate glass different from the first plate glass,
A detector for detecting a defect candidate range of the first plate glass and a defect candidate range of the second plate glass;
And a determination unit that determines that there is a defect continuing to the first plate glass and the second plate glass when there is a range in which the defect candidate range position of the first plate glass overlaps the defect candidate range position of the second plate glass ,
Wherein the detecting unit includes a photographing unit and a calculating unit,
Wherein,
Introducing an image on the first sheet glass and the second sheet glass,
The operation unit,
And a defective candidate region extracting means for extracting a defect candidate portion based on the image introduced by the photographing section and enlarging the defect candidate portion in the glass width direction so as to make the defect candidate region larger than the defect candidate portion, A device for manufacturing a plate glass.
A forming step of forming a first plate glass and a second plate glass different from the first plate glass;
A detection step of detecting a defect candidate range of the first plate glass and a defect candidate range of the second plate glass;
And a determination step of determining that there is a defect continuing to the first plate glass and the second plate glass when a defect candidate range position of the first plate glass and a defect candidate range position of the second plate glass overlap each other and,
Wherein the detecting step comprises:
Introducing an image on the first sheet glass and the second sheet glass;
Extracting a defect candidate portion based on the introduced image and setting the defect candidate range by enlarging the defect candidate portion in the glass width direction so that the defect candidate range is larger than the defect candidate portion; Method of manufacturing a plate glass.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2011202283A JP5796430B2 (en) | 2011-09-15 | 2011-09-15 | Sheet glass inspection apparatus, sheet glass inspection method, sheet glass manufacturing apparatus, and sheet glass manufacturing method |
JPJP-P-2011-202283 | 2011-09-15 | ||
PCT/JP2012/072624 WO2013038972A1 (en) | 2011-09-15 | 2012-09-05 | Plate glass inspection device, plate glass inspection method, plate glass manufacturing device, and plate glass manufacturing method |
Publications (2)
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KR20140060280A KR20140060280A (en) | 2014-05-19 |
KR101935979B1 true KR101935979B1 (en) | 2019-01-07 |
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KR1020147002925A KR101935979B1 (en) | 2011-09-15 | 2012-09-05 | Plate glass inspection device, plate glass inspection method, plate glass manufacturing device, and plate glass manufacturing method |
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JP (1) | JP5796430B2 (en) |
KR (1) | KR101935979B1 (en) |
CN (1) | CN103718024B (en) |
TW (1) | TWI548871B (en) |
WO (1) | WO2013038972A1 (en) |
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KR101755136B1 (en) * | 2014-02-21 | 2017-07-06 | 아반스트레이트 가부시키가이샤 | Method and apparatus for making glass sheet |
KR101733018B1 (en) * | 2015-02-25 | 2017-05-24 | 동우 화인켐 주식회사 | Apparatus and method for detecting defect of optical film |
JP6674138B2 (en) * | 2016-05-12 | 2020-04-01 | 日本電気硝子株式会社 | Glass plate manufacturing apparatus and glass plate manufacturing method |
KR20220158676A (en) * | 2020-03-25 | 2022-12-01 | 니폰 덴키 가라스 가부시키가이샤 | Glass plate manufacturing method and manufacturing apparatus therefor |
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JP2004125686A (en) * | 2002-10-04 | 2004-04-22 | Nippon Steel Corp | Method and apparatus for detecting flaw of steel sheet, computer program, and computer-readable recording medium |
JP2005069989A (en) * | 2003-08-27 | 2005-03-17 | Apollo Mec:Kk | Inspection apparatus |
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JP3218908B2 (en) * | 1995-03-23 | 2001-10-15 | 日本鋼管株式会社 | Surface flaw inspection method and apparatus |
EP2166344A1 (en) * | 2004-11-24 | 2010-03-24 | Asahi Glass Company, Limited | Defect inspection method and apparatus for transparent plate materials |
JP4626982B2 (en) * | 2005-02-10 | 2011-02-09 | セントラル硝子株式会社 | Defect detection device and detection method for end face of glass plate |
US7283227B2 (en) * | 2005-11-21 | 2007-10-16 | Corning Incorporated | Oblique transmission illumination inspection system and method for inspecting a glass sheet |
WO2008072693A1 (en) * | 2006-12-14 | 2008-06-19 | Nippon Electric Glass Co., Ltd. | Glass sheet defect detection device, glass sheet manufacturing method, glass sheet, glass sheet quality judging device, and glass sheet inspection method |
JP2010019834A (en) * | 2008-06-13 | 2010-01-28 | Nippon Electric Glass Co Ltd | Glass plate defect inspection apparatus and manufacturing method of glass plate for flat panel display |
KR101609007B1 (en) * | 2008-07-18 | 2016-04-04 | 아사히 가라스 가부시키가이샤 | Image data processing apparatus and method for defect inspection, defect inspecting apparatus and method using the image data processing apparatus and method, board-like body manufacturing method using the defect inspecting apparatus and method, and recording medium |
JP5206697B2 (en) * | 2009-01-15 | 2013-06-12 | 新日鐵住金株式会社 | Continuous defect determination method, continuous defect determination device, and program |
JP5373593B2 (en) * | 2009-12-25 | 2013-12-18 | シャープ株式会社 | Image processing method, image processing apparatus, program, and recording medium |
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2011
- 2011-09-15 JP JP2011202283A patent/JP5796430B2/en active Active
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2012
- 2012-09-05 CN CN201280034975.5A patent/CN103718024B/en active Active
- 2012-09-05 WO PCT/JP2012/072624 patent/WO2013038972A1/en active Application Filing
- 2012-09-05 KR KR1020147002925A patent/KR101935979B1/en active IP Right Grant
- 2012-09-14 TW TW101133769A patent/TWI548871B/en active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2004125686A (en) * | 2002-10-04 | 2004-04-22 | Nippon Steel Corp | Method and apparatus for detecting flaw of steel sheet, computer program, and computer-readable recording medium |
JP2005069989A (en) * | 2003-08-27 | 2005-03-17 | Apollo Mec:Kk | Inspection apparatus |
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TW201312097A (en) | 2013-03-16 |
JP2013064615A (en) | 2013-04-11 |
KR20140060280A (en) | 2014-05-19 |
CN103718024B (en) | 2016-03-09 |
TWI548871B (en) | 2016-09-11 |
CN103718024A (en) | 2014-04-09 |
WO2013038972A1 (en) | 2013-03-21 |
JP5796430B2 (en) | 2015-10-21 |
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