WO2010104265A2 - 결점 검사를 위한 검사장치 - Google Patents
결점 검사를 위한 검사장치 Download PDFInfo
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- WO2010104265A2 WO2010104265A2 PCT/KR2009/007560 KR2009007560W WO2010104265A2 WO 2010104265 A2 WO2010104265 A2 WO 2010104265A2 KR 2009007560 W KR2009007560 W KR 2009007560W WO 2010104265 A2 WO2010104265 A2 WO 2010104265A2
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- WIPO (PCT)
- Prior art keywords
- light
- image
- reflected
- inspection
- incident
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/12—Reflex reflectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/024—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by means of diode-array scanning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/025—Measuring of circumference; Measuring length of ring-shaped articles
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/50—Optics for phase object visualisation
Definitions
- the present invention is an inspection device for inspecting defects, such as bubbles, micro deformation, foreign matter, perforation formed on the inside or surface of the subject, including an opaque plate or a transparent plate, more specifically, by installing a knife wedge and a retroreflective plate
- the present invention relates to an inspection apparatus for inspecting defects so that an image of defects can be obtained clearly and stably even when vibrations or warpages occur.
- FIG. 1 illustrates an image of a sheet beam that is incident on a reflector when the sheet beam is incident on a reflector that is upwardly or downwardly in a general reflective optical system.
- the sheet shown on the left side of FIG. 1 shows a light path when the end is folded upward, and the subject shown on the right shows a case where the end is folded downward.
- a sheet beam of the same path as the optical axis of the camera 1 is irradiated to the subject 5 in the illumination device 3 and reflected from the subject 5, and the subject ( The reflected light reflected at 5) is incident on the reflecting paper 7.
- the light is incident downwardly from the normal path of the dotted line as shown in the upper right side of FIG. 1, when the reflecting paper 7 is viewed from the front, it is lower than the bright line in the normal path (dotted line).
- Bright lines are formed in the spaced apart areas.
- the reflector 7 is a general reflector having the same angle of incidence and the same angle of reflection. Therefore, the light reflected from the reflector 7 cannot reach the surface of the subject 5, so that the camera 1 When the subject vibrates or warps, an image of the light incident portion of the subject 5 cannot be obtained.
- This phenomenon can be applied as it is to a phenomenon in which vibration occurs in the subject 5.
- 2 is an optical system for explaining a refractive phenomenon caused by a defect when conventionally irradiating light to a subject under light.
- the brightness of the screen 9 is 1 unit.
- an abnormal state that may change the refractive index for example, density, foreign matter, deformation, etc. (hereinafter, referred to as a defect) may change the refractive angle.
- the light is refracted by the defect 11
- the light does not reach the position where the optical path (dotted line) meets when the defect 11 is absent, so that the part where the dotted line terminates on the screen has the brightness of 0 unit, and the defect
- the portion where the light refracted by 11 meets the screen 9 is converted into brightness by 2 units.
- the present invention is to solve this problem, the problem of the present invention by using a knife edge (knife edge) to block the light to have an image having a gradient of the change in brightness by inspecting to accurately determine the shape of the defect It is for providing a device.
- a knife edge knife edge
- Another problem of the present invention is to accurately photograph a subject using a property of rereflection at an angle incident on the retroreflective paper even when a bending phenomenon occurs in the subject, and when the subject generates a vibration, the retroreflective paper
- An object of the present invention is to provide an inspection apparatus for accurately photographing a subject by re-reflecting incident light, such as when there is no vibration in the subject.
- the solution of the present invention for the above problem is a light source for irradiating the light to the reflective object reflecting the incident light; A retroreflective plate for retroreflecting the light reflected from the reflective object to the reflective object; An imaging lens configured to form reflected light reflected back and reflected from the retroreflective plate by the retroreflective plate; Imaging means for imaging light incident through the imaging lens; And a knife edge disposed between the imaging lens and the reflective object and formed in a plate shape perpendicular to the optical axis of the imaging lens.
- another solution of the present invention is a light source which is moved at a constant speed and irradiates light to the transparent test object that transmits the incident light;
- a retroreflective plate for retroreflecting the light transmitted through the transparent object in the same direction as the incident direction to irradiate the transparent object;
- a mask provided between the light source and the transparent test object and having a slit formed therein;
- Imaging means for forming an image by incident light;
- An imaging lens focusing light that has been retroreflected by the retroreflective plate and transmitted through the transparent test object to form an image on the imaging means;
- a knife edge disposed between the imaging lens and the transparent test object and formed in a plate shape perpendicular to the optical axis of the imaging lens.
- the use of the retroreflective plate of the present invention makes it possible to stably find defects even when a subject forms a curved surface or a mechanical vibration occurs in the subject.
- FIG. 1 illustrates an image of a sheet beam that is incident on a reflector when the sheet beam is incident on a reflector that is upwardly or downwardly in a general reflective optical system.
- 2 is an optical system for explaining a refractive phenomenon caused by a defect when conventionally irradiating light to a subject under light.
- FIG. 3 is an optical block diagram illustrating the principle of a knife edge of an embodiment of the present invention.
- FIG. 4 is an optical block diagram illustrating a path of light passing through the inside of a subject under the present invention.
- FIG. 5 is an optical diagram illustrating a path of light reflected from a surface of a test subject in the present invention.
- FIG. 6 is a block diagram for inspecting a transparent sample using an embodiment of the present invention.
- FIG. 7 is an optical path diagram illustrating the optical path of FIG. 6.
- FIG. 9 is an optical path diagram when no knife edge is used to contrast with FIG. 7.
- FIG. 10 is a light path diagram illustrating that the retroreflective plate is insensitive to vibration in the present invention.
- FIG. 11 is a light path diagram illustrating that the light sent by the retroreflective plate acts as a concave mirror in the present invention is collected at the focus again.
- FIG. 12 is a block diagram illustrating an optical path to a reflective subject in one embodiment of the present invention.
- Figure 13 is a block diagram illustrating the installation effect of the knife edge in the reflective object of the present invention, showing the intensity of the image and brightness.
- FIG. 3 is an optical block diagram illustrating the principle of a knife edge of an embodiment of the present invention.
- the point light source 25 is located at the left focal point of the field lens 15, and the light emitted from the light source 25 is irradiated to the screen 9 through the right focal point of the field lens 15. If there is a defect 11 between the field lens 15 and the right focal point of the field lens 15, the optical path of the light passing through the defect 11 is refracted from the normal light path of the dotted line and is preferably an edge located at the right focal point, preferably The ends are terminated without passing through a knife edge 13 made of a sharp plate shape.
- the position where the dashed light beam, which is the normal light beam reached on the screen, in the absence of the defect 11 is hit on the screen is zero-brightness because the light beam does not enter when the defect 11 is present. But the other point on the screen is that there is no change in brightness.
- FIG. 3 when the light is blocked using the knife edge 13, a gradient of the brightness on the screen is extracted because the change value of the brightness on the screen due to the defect 11 is reduced. Therefore, when the knife edge 13 is used as in FIG. 3, not only the contour of the subject but also the image of the subject can obtain a clear image having a gradient.
- FIG. 4 is an optical block diagram illustrating a path of light passing through the inside of a test subject in the present invention
- FIG. 5 is an optical block diagram illustrating a path of light reflected from the surface of a test subject in the present invention.
- a light source 25 for generating a sheet beam is positioned at the left focus of the field lens 17, and a knife edge 13 is positioned at the right focus of the field lens 17, and the field lens 17 is positioned at the right focus of the field lens 17. And the object 19 between the knife edge 13 and the knife edge 13. The light passing through the object 19 is formed on the line CCD 23 by the imaging lens 21 to form an image of the transparent object.
- the knife edge 13 is installed perpendicular to the optical axis of the imaging lens 21, and the front end surface is approached to the optical axis to sharply clear the image of overlapping surface curvature or internal information in the image of the defect formed in the subject 19. You can get it.
- the light source 25 and the field lens 17 are installed on the upper part of the subject 27 so that light is incident on the surface of the subject to be inclined.
- the light reflected from the surface passes through the imaging lens 21 to form an image on the line CCD 23, and a knife edge 13 is installed at the focal point of the field lens 17 to provide a clear image on the line CCD 23.
- FIG. 6 is a block diagram for inspecting a transparent sample by using an embodiment of the present invention
- Figure 7 is a light path diagram illustrating the optical path of Figure 6
- Figure 8 is a view of the image of the defect photographed in the present invention
- 3 9 is a graph of the dimension
- FIG. 9 is an optical path diagram when no knife edge is used to contrast with FIG. 7.
- Light emitted from the light source 25 generating the sheet beam is reflected by a half mirror 29 inclined to the ground, so that light is incident on the retroreflective plate 31 in parallel with the ground, and the retroreflective plate 31 The reflected light is reflected back toward the half mirror 29, and the light incident on the half mirror 29 passes through the image forming lens 21 to form an image on the line CCD 23.
- a mask 33 is provided between the retroreflective plate 31 and the half mirror 29 to allow light to enter the retroreflective plate 31 by passing through a slit to reduce interference of light of various optical paths.
- the transparent object 35 is scanned while moving in the same direction as the arrow on the back surface of the mask 33.
- FIG. 7A illustrates the light quantity adjustment for the movement of the knife edge 13, and the solid line a in the lateral direction in A means when the upper end of the knife edge 13 is positioned to coincide with the optical axis.
- the dotted line b denotes a state in which the optical path is bent downward by the change of the refraction angle of the sheet beam from the light source by the convex defect 37 formed in the subject 35.
- the image of the transparent object 35 is imaged on the line CCD 23 by the optical path as shown in FIG. 2, but the concave defect 37 is formed in the transparent object 35. (3) is generated, the refracted light 3 is blocked from reaching the line CCD 23 by the knife edge 13, and the image of the refracted portion is darkened.
- the retroreflective plate 31 reflects the light incident from the light source back toward the light source so that an accurate image can be obtained even when the transparent object 35 is vibrated or curved.
- 7B is an image scanned on the line CCD 23, and C is a graph showing the intensity of the longitudinal cross-sectional light amount of B.
- FIG. As can be seen from the image of B of FIG. 7, not only the contour of the defect but also the shape of the overall defect can be obtained.
- the light and dark portions have a continuous curve to form a gradient of the light intensity. Since the image capable of obtaining such a gradient can three-dimensionalize the defect image as shown in FIG. 8, the appearance of the defect image can be confirmed in detail.
- FIG. 10 is an optical path diagram illustrating the role of the retroreflective plate in the present invention.
- FIG. 10 illustrates an optical path when light from a light source strikes a general reflector, and indicates that only a part of light is reflected in the direction of the light source because light reflected from the reflector is reflected in various directions.
- 10 (b) shows an optical path in which light from a light source is reflected by a retroreflective plate provided in a vertical direction, and all light from the light source is reflected toward the light source.
- (c) of FIG. 10 shows the optical path when reflected by the retroreflective plate tilted with respect to the vertical plane, and in this case, all the light reflected from the retroreflective plate is returned to the light source.
- this phenomenon means that light emitted from the light source is all returned to the light source regardless of the inclination angle of the retroreflective plate when reflected from the retroreflective plate.
- the retroreflective plate when used as the reflector in the present invention, an accurate image of the inspected object may be obtained even when vibration occurs in the inspected object.
- FIG. 11 is a light path illustrating the converging mirror of the retroreflective plate in the present invention, where light gathers in one place.
- FIG. 11A illustrates that light emitted from the light source 25 is reflected by the half mirror 29, reflected back by the retroreflective plate 31, and collected through the half mirror 29 to focus.
- (b) of FIG. 11 shows that the light source 25 is farther from the retroreflective plate 31 than (a).
- the light reflected from the retroreflective plate 31 is the light source 25.
- FIG. 11C illustrates a light path of the reflected light as the point light source is located at a focal length, farther from the light source 25 than in FIG.
- the light reflected from the retroreflective plate 31 forms the same optical path as the light focusing on the light source 25, and the light source 25 even when the distance between the light source 25 and the retroreflective plate 31 is variable. Form an optical path with the focus on). Therefore, the test object 35 passes between the light source 25 and the retroreflective plate 31, and the distance between the test object 35 and the retroreflective plate 31 or between the test object 35 and the light source 25 is passed. Is reflected by the retroreflective plate 31 at all times even when the vibration is variable, so that the subject 35 is subject to vibration even when vibration is generated in the subject 35 because the light path focuses on the light source 25. You can get an accurate image of.
- FIG. 12 is a block diagram illustrating an optical path to a reflective subject in one embodiment of the present invention.
- a mask 33 having a slit is provided on the upper surface of the reflective object 41, and the light emitted from the light source 25 is reflected by the half mirror 29 to be incident on the reflective object 41 at a predetermined inclination angle.
- the light reflected from the reflective object 41 is incident on the retroreflective plate 31, reflected, and then reflected again by the reflective object 41, and then passes through the half mirror 29 and passes through the image forming lens 21.
- the knife edge 31 is provided where the image formed in the CCD 23 and the light reflected by the retroreflective plate are collected in one place.
- FIG. 12B shows an image obtained from the line CCD
- FIG. 12C shows a graph of the intensity of the brightness of the image of B. As shown in B and C of FIG. Can be obtained.
- Figure 13 is a block diagram illustrating the installation effect of the knife edge in the reflective object of the present invention, showing the intensity of the image and brightness.
- FIG. 13 shows the optical path when the convex defect 39 of the reflective object 41 of FIG. 12 passes through the slit of the mask 33.
- the optical paths of the light reflected by the retroreflective plate 31 are (a), (b), (c), (d), (e) In the same order as In the state of (a), the light reflected from the retroreflective plate 31 is reflected at the defect-free portion to represent the average brightness in the CCD image of B, and has an intensity value of intermediate brightness as shown in the graph C of the brightness.
- state of (b) indicates a state in which light incident from the retroreflective plate 31 is refracted at the front of the convex defect 39 and blocked by the knife edge 13.
- the image of the darkest part of the image B is It is picked up and has the lowest intensity in graph C.
- image B has a medium brightness and has a medium value of intensity in graph C.
- the state of (D) indicates a state in which light incident from the retroreflective plate 31 is reflected at the rear of the convex defect 39 and overlaps with other light rays so that reinforcement of the light occurs.
- the value of the intensity of the brightness of the graph C is also best formed.
- the slit of the mask passes through the convex defect 39, and has the same image and graph as the state of the first (a).
- the reflected light reflected by the normal portion and the reflected light irregularly reflected by the convex defect 39 are caused to reinforce and cancel. Only reinforcement occurs because it is blocked by the knife edge. Therefore, by weakening the difference between the brightness of the reinforcement point and the offset point to increase the sensitivity of the image to the convex defect 39, to obtain a gradient of the intensity of the light to obtain three-dimensional information about the image .
- knife edges are used to increase the sensitivity of the image.
- the sensitivity of the image is further increased by bringing the knife edge closer to the optical axis of the optical system.
- the sensitivity is increased because the amount of light changes when the light source is small compared to the case where the light source is large.
- the slit width of the mask installed on the front of the subject is reduced, interference between the lights can be reduced, thereby obtaining a more sensitive image.
- the use of the retroreflective plate of the present invention makes it possible to stably find defects even when a subject forms a curved surface or a mechanical vibration occurs in the subject.
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Abstract
Description
Claims (6)
- 입사되는 빛을 반사시키는 반사 피검체에 빛을 조사하는 광원;상기 반사 피검체에서 반사되어 입사되는 빛을 상기 반사 피검체에 재귀 반사시키는 재귀 반사판;상기 재귀 반사판으로부터 재귀 반사된 재귀 반사광이 상기 반사 피검체에 입사되어 반사되는 반사광을 결상시키는 결상렌즈;상기 결상렌즈를 통하여 입사되는 빛을 촬상하는 촬상수단;상기 결상렌즈와 상기 반사 피검체 사이에 설치되며, 상기 결상렌즈의 광축에 수직으로 설치되는 판 형상으로 이루어지는 나이프 에지;를 포함하는 것을 특징으로 하는 결점 검사를 위한 검사장치.
- 제1항에 있어서,상기 반사 피검체와 상기 광원 사이에는 슬릿이 형성된 마스크가 설치되고, 상기 반사 피검체는 이동되어 상기 촬상수단에 촬상되는 영상은 라인 스캐닝되는 것을 특징으로 하는 결점 검사를 위한 검사장치.
- 제1항 또는 제2항에 있어서,상기 광원 영상의 크기를 작게 하는 방법, 상기 마스크의 슬릿 폭을 작게 하는 방법 및 상기 나이프 에지를 광축에 접근시키는 방법 중의 하나 또는 두 개 이상을 선택하도록 함으로써 상기 영상의 민감도를 증가시키는 것을 특징으로 하는 결점 검사를 위한 검사장치.
- 제2항에 있어서,상기 광원으로부터 출발한 빛은 상기 반사 피검체에 경사지게 입사되고, 상기 반사 피검체에서 반사된 빛은 상기 재귀 반사판에 입사되어 재귀 반사되고, 상기 재귀 반사판에서 재귀 반사된 빛은 상기 반사 피검체의 결점에서 반사되고, 상기 결점에서 반사된 빛이 보강과 상쇄를 발생시킬 때, 상기 나이프 에지는 상쇄를 발생시키는 광이 상기 결상렌즈에 입사되는 것을 차단시키는 것을 특징으로 하는 결점 검사를 위한 검사장치.
- 일정 속도로 이동되며 입사되는 빛을 투과시키는 투과 피검체에 빛을 조사시키는 광원;상기 투과 피검체에서 투과되어 입사된 빛을 입사방향과 동일하게 재귀 반사시켜 상기 투과 피검체에 조사하는 재귀 반사판;상기 광원과 상기 투과 피검체 사이에 설치되며, 슬릿이 형성된 마스크;입사된 빛에 의하여 상을 형성하는 촬상수단;상기 재귀 반사판에서 재귀 반사되어 상기 투과 피검체를 투과한 빛을 집속시켜 상기 촬상수단에 결상하는 결상렌즈;상기 결상렌즈와 상기 투과 피검체 사이에 설치되며, 상기 결상렌즈의 광축에 수직으로 설치되는 판 형상으로 이루어지는 나이프 에지;를 포함하는 것을 특징으로 하는 결점 검사를 위한 검사장치.
- 제5항에 있어서,상기 광원 영상의 크기를 작게 하는 방법, 상기 마스크의 슬릿 폭을 작게 하는 방법 및 상기 나이프 에지를 광축에 접근시키는 방법 중의 하나 또는 두 개 이상을 선택하도록 함으로써 상기 영상의 민감도를 증가시키는 것을 특징으로 하는 결점 검사를 위한 검사장치.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011553931A JP2012519866A (ja) | 2009-03-09 | 2009-12-17 | 欠点検査のための検査装置 |
CN2009801580919A CN102348955A (zh) | 2009-03-09 | 2009-12-17 | 用于缺陷检测的检测设备 |
EP09841578A EP2426457A2 (en) | 2009-03-09 | 2009-12-17 | Inspection device for defect inspection |
US13/255,751 US20110317156A1 (en) | 2009-03-09 | 2009-12-17 | Inspection device for defect inspection |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2009-0019652 | 2009-03-09 | ||
KR1020090019652A KR101114362B1 (ko) | 2009-03-09 | 2009-03-09 | 결점검사를 위한 검사장치 |
Publications (2)
Publication Number | Publication Date |
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WO2010104265A2 true WO2010104265A2 (ko) | 2010-09-16 |
WO2010104265A3 WO2010104265A3 (ko) | 2010-10-28 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/KR2009/007560 WO2010104265A2 (ko) | 2009-03-09 | 2009-12-17 | 결점 검사를 위한 검사장치 |
Country Status (6)
Country | Link |
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US (1) | US20110317156A1 (ko) |
EP (1) | EP2426457A2 (ko) |
JP (1) | JP2012519866A (ko) |
KR (1) | KR101114362B1 (ko) |
CN (1) | CN102348955A (ko) |
WO (1) | WO2010104265A2 (ko) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130242083A1 (en) * | 2010-10-08 | 2013-09-19 | Timothy A. Potts | Retro-reflective imaging |
CN112683186A (zh) * | 2020-11-25 | 2021-04-20 | 浙江大学 | 一种物理模型试验三维变形非接触式高频监测装置 |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
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- 2009-12-17 EP EP09841578A patent/EP2426457A2/en not_active Withdrawn
- 2009-12-17 CN CN2009801580919A patent/CN102348955A/zh active Pending
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WO2010104265A3 (ko) | 2010-10-28 |
KR101114362B1 (ko) | 2012-02-14 |
EP2426457A2 (en) | 2012-03-07 |
CN102348955A (zh) | 2012-02-08 |
JP2012519866A (ja) | 2012-08-30 |
US20110317156A1 (en) | 2011-12-29 |
KR20100101259A (ko) | 2010-09-17 |
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