WO2014087868A1 - 検査システム及び検査用照明装置 - Google Patents
検査システム及び検査用照明装置 Download PDFInfo
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- WO2014087868A1 WO2014087868A1 PCT/JP2013/081658 JP2013081658W WO2014087868A1 WO 2014087868 A1 WO2014087868 A1 WO 2014087868A1 JP 2013081658 W JP2013081658 W JP 2013081658W WO 2014087868 A1 WO2014087868 A1 WO 2014087868A1
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- inspection
- light
- solid angle
- light source
- diaphragm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
-
- 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
- G01N21/9501—Semiconductor wafers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
- G01N2021/8822—Dark field detection
-
- 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
- G01N21/956—Inspecting patterns on the surface of objects
Definitions
- the present invention relates to, for example, an inspection system and an inspection illumination device used for irradiating an inspection object with inspection light and inspecting the appearance, scratches, defects, etc. of the product.
- an inspection illumination device used for an appearance inspection of a product there is a coaxial illumination in which the image capturing direction and the direction to illuminate the inspection object are matched as shown in Patent Document 1.
- the coaxial illumination is provided to be inclined between a light source that emits inspection light in a horizontal direction, the inspection object, and an imaging device provided above the inspection object, and the inspection light is supplied to the inspection object.
- a half mirror arranged so that the reflected light from the inspection object is transmitted to the imaging device side.
- the stray light incident on the imaging apparatus can be reduced by such a method, in the case of a very small defect, the brightness of the image to be captured does not change and is detected as a defect. May not be possible.
- the present invention has been made in view of the above-described problems. For example, even if illumination conditions are severe, or a feature point such as a defect is very small, a change in reflection or scattering caused by the feature point is slight. To provide an inspection system and an inspection illumination device that can greatly change the amount of light within the observation solid angle of the imaging device and can detect such minute feature points. With the goal.
- the defect in the inspection object is minute, and the defect This is based on a new idea that even if the amount of change in reflection or scattering due to the above is very small, it can be regarded as a change in the observation solid angle of the imaging device.
- the inspection system of the present invention is an inspection system that includes an inspection illumination device that irradiates an inspection target with inspection light and an imaging device that images light reflected or scattered from the inspection target.
- the inspection illumination device includes a surface light source that emits inspection light, a lens that is provided between the surface light source and the inspection object, and that forms an image of the surface light source in the vicinity of the inspection object; and the surface light source.
- a first light-shielding mask provided between the inspection object and forming a dark area in an irradiation solid angle of the inspection light applied to each point of the inspection object.
- the shape or size of the observation solid angle is set based on the shape or size of the dark area in the solid angle of the inspection light irradiated to each point of the inspection object from the inspection illumination device .
- the inspection illumination device of the present invention includes a surface light source that emits inspection light, a lens that is provided between the surface light source and the inspection target, and forms an image of the surface light source in the vicinity of the inspection target.
- a first light-shielding mask that is provided between the surface light source and the inspection target and forms a dark part region in an irradiation solid angle of the inspection light applied to each point of the inspection target.
- the inspection light when the inspection light is converted into parallel light by the lens, the portion shielded by the first light-shielding mask is formed as a shadow on the inspection object, whereas in the present invention, inspection is performed. While irradiating each point with the inspection light without forming a shadow on the object, the inspection light can be irradiated only from a predetermined region with respect to the irradiation solid angle of the inspection light at each point.
- a dark area is formed in a part of a solid angle of the inspection light irradiated to each point to be inspected by the first light shielding mask, and the observation solid angle is set according to the size and shape of the dark area. Therefore, even when the reflection direction or the scattering direction is slightly changed due to a minute defect or the like, the ratio of the bright area to the dark area is easily changed within the observation solid angle of the imaging apparatus, and the defect is easily detected.
- only the central part of the irradiation solid angle at each point to be inspected can be a dark part area, and only the peripheral part can be a bright part area. It is possible to irradiate the inspection light with the irradiated solid angle.
- the size of the observation solid angle is It is sufficient that the size is set to be substantially the same as the size of the dark area of the irradiation solid angle. If this is the case, the dark area of the reflected light solid angle matches the observation solid angle in the normal state so that the image is dark, and if the reflection direction changes even slightly, the bright area of the reflected light solid angle becomes the observation solid angle. It is possible to enter inside and capture the changes. Therefore, even a minute defect or the like that could not be captured in the past can be captured as a light / dark difference in machine vision.
- the focus of the lens As long as the first aperture is further provided at a predetermined position. That is, by changing the aperture amount of the first aperture, the size of the irradiation solid angle at each point can be uniformly set to a desired size. Further, if the first diaphragm is disposed inside the focal point of the lens, the solid angle of the inspection light irradiated to the outside of the imaging surface and the dark area thereof from the outside to the central portion side where the optical axis is located. Can be tilted.
- the direction of the solid angle of irradiation of the inspection light can be all made parallel to the optical axis.
- the first diaphragm is disposed outside the focal point of the lens, the solid angle of the inspection light irradiated to the outside of the imaging plane and the dark area thereof are moved from the central portion side where the optical axis is located to the outside. Can be tilted.
- various adjustments can be made with respect to the irradiation solid angle and the dark area by the arrangement of the first diaphragm and the amount of the diaphragm, and the aspect suitable for the inspection object can be obtained.
- the first light-shielding mask is provided in the vicinity of the first diaphragm, and the light-shielding portion of the first light-shielding mask may be formed smaller than the opening diameter of the first diaphragm.
- the second light-shielding mask on which a predetermined mask pattern is formed is provided in the vicinity of the emission side of the surface light source. If it is such, the shadow which is not formed with the said 1st light shielding mask can be formed on the said test object with the said 2nd light shielding mask, and a pattern can be formed. If there is a problem with the shape of the inspection object, the pattern is distorted, so that a shape defect can be easily detected.
- Coaxial illumination cannot be used, for example, even when the inspection light must be irradiated obliquely from above the inspection object, the entire surface of the surface light source can be imaged on the inspection object, and at each point In order to make the irradiation solid angle uniform and to make the measurement accuracy constant on the entire surface of the inspection target plane, the surface light source has a light emission plane, and the optical axis of the lens is relative to the inspection target plane on the inspection target.
- the first virtual plane including the light emitting plane, the second virtual plane including the main surface of the lens, and the third virtual plane including the inspection target plane are in a straight line. It suffices if they are arranged so as to cross each other.
- the surface light source has a light emitting curved surface so that the inspection target has a curved surface to be inspected and the surface light source forms an image over the entire surface of the curved surface so that the defect detection accuracy on the curved surface can be further improved.
- the shape of the light emitting curved surface may be set so that light emitted from each point of the light emitting curved surface forms an image at each point of the curved surface to be inspected by the lens.
- the irradiation solid angle of the inspection light irradiated to each point to be inspected and the size and mode of the dark area can be freely adjusted. Even a minute defect or the like that has been difficult to detect can be detected.
- the typical perspective view showing the appearance of the inspection system concerning one embodiment of the present invention The typical sectional view showing the internal structure of the inspection system in the embodiment.
- inspection system in the embodiment. The schematic diagram which shows the irradiation solid angle in each point on the test object in the same embodiment.
- Inspection system 100 Illumination device for inspection 1: Surface light source 11: Light exit surface 12: Radiation fin 2: Lens 31: First diaphragm 32: Second diaphragm 33: Third diaphragm 34: Fourth diaphragm 4: Half mirror 41: Frame 91: First cylindrical body 92: Second cylindrical body 93: Box C: Imaging device IM: Imaging plane L1: Irradiation optical path L11: First optical path L12: Second optical path L2: Reflected optical path M1 : First light shielding mask M2: second light shielding mask W: inspection target
- the inspection illumination device 100 according to the first embodiment and the inspection system 200 including the imaging device C are so-called coaxial in which the direction in which the inspection target W is imaged coincides with the direction in which the inspection target W is illuminated. Illumination, which is used to cause a defect of the inspection target W to appear as a light / dark difference in an image captured by the imaging device C.
- the feature points such as defects of the inspection object W include various defects such as surface scratches, appearance shapes, presence / absence of holes, and other feature types.
- the illumination device for inspection 100 has a substantially L-shaped housing as shown in the perspective view of FIG. 1 and the cross-sectional view of FIG. 2, and the inspection light is inspected from the surface light source 1 inside thereof.
- An irradiation light path L1 for irradiating W and a reflection light path L2 until the reflected light from the inspection object W reaches the imaging device C are formed. More specifically, a first cylindrical body 91 extending in the horizontal direction and a second cylindrical body 92 extending in the vertical direction are respectively connected to the box body 93, and the second cylindrical body extending in the vertical direction.
- the imaging device C is attached to the upper surface opening side of 92, and the inspection object W is placed on the lower surface opening of the box 93.
- the irradiation optical path L1 is formed in an L shape, and is reflected by the first optical path L11 in which the inspection light travels in the horizontal direction. And a second optical path L12 traveling downward.
- the surface light source 1 that emits the inspection light, the second diaphragm 32 provided in the vicinity of the surface light source 1, and the surface light source 1 are emitted in the order in which the inspection light travels.
- the lens 2 that collects the inspection light, the first diaphragm 31 provided near the light incident side of the lens 2, the first light-shielding mask M1 provided near the first diaphragm 31, and the inspection light A half mirror 4 provided to be inclined with respect to the reflected light path L2 and the irradiation light path L1 so as to be reflected downward is disposed. Furthermore, a third diaphragm 33 through which the inspection light reflected by the half mirror 4 passes is provided on the second optical path L12. Then, the inspection light that has passed through the third diaphragm 33 from inside the box 93 is irradiated onto the inspection object W.
- the third diaphragm 33, the half mirror 4, and the fourth attached to the upper surface of the box 93 are arranged in the order in which the reflected light reflected from the inspection object W proceeds.
- a diaphragm 34 is provided up to the imaging device C. That is, the half mirror 4 and the third diaphragm 33 are arranged in a portion where the irradiation light path L1 and the reflection light path L2 overlap.
- the first diaphragm 31, the second diaphragm 32, the third diaphragm 33, and the fourth diaphragm 34 described above are variable diaphragms, and the amount of diaphragm can be changed as appropriate. Further, a fixed aperture with a fixed aperture amount may be used depending on the use mode.
- the surface light source 1 has a light emission surface 11 formed of, for example, a chip-type LED, and heat radiation fins 12 for heat radiation project outward. As shown in the sectional view of FIG. 2, the surface light source 1 is attached so as to be able to advance and retreat in the axial direction in the first cylindrical body 91 so that the irradiation start position of the inspection light can be adjusted. . That is, independent of the control of the irradiation solid angle by the first diaphragm 31 to be described later, the positional relationship among the surface light source 1, the lens 2, and the inspection target W is changed, so that the inspection light in the inspection target W is changed. The irradiation range can be controlled.
- the second diaphragm 32 is provided in the vicinity of the light emission surface 11 of the surface light source 1, and the irradiation area of the inspection light of the surface light source 1 is changed by adjusting the amount of the diaphragm, and the inspection object The irradiation range of the inspection light at W can be changed.
- the first light shielding mask M1 is provided close to the first diaphragm 31, and is a schematic diagram of the first diaphragm 31 and the first light shielding mask M1 when viewed along the optical axis in FIG.
- a circular light-shielding portion M11 is formed in the center portion of the face plate of the transparent glass plate. That is, the light shielding part M11 of the first light shielding mask M1 covers a part of the opening 31a of the first diaphragm 31.
- the diameter of the light shielding portion M11 is formed smaller than the opening diameter of the first diaphragm 31, and the inspection light emitted from the surface light source 1 blocks light passing through the vicinity of the optical axis in the first diaphragm 31. It is like that.
- the inspection light passing through the gap between the first diaphragm 31 and the light shielding portion M11 enters the lens 2 and reaches the inspection object W.
- the first diaphragm 31 is provided on the light incident side of the lens 2, and the inspection light that is condensed at each point within the irradiation range with respect to the surface of the inspection object W by the lens 2 is equally irradiated. It is for adjusting the angle.
- the function related to the control of the irradiation solid angle will be described together with the operation of the first light shielding mask M1 described later.
- the lens 2 is attached to a side opening of the box 93, and is arranged so that an image forming surface, which is an image forming position of the light source, is positioned in the vicinity of the surface of the inspection object W.
- the inclination distribution of the irradiation solid angle at each point of the image plane IM can be adjusted by the positions of the first diaphragm 31 and the first light shielding mask M1 with respect to the lens 2.
- the amount of inclination is increased toward the outer side of the imaging plane IM.
- a large irradiation solid angle is formed.
- the first diaphragm 31 When the first diaphragm 31 is arranged on the focal point on the surface light source 1 side, the irradiation directions of all the irradiation solid angles are parallel to the optical axis, and the first diaphragm 31 is the surface of the lens 2. In the case where it is arranged outside the focal point on the light source 1 side, the amount of inclination toward the optical axis increases as the irradiation solid angle is at a point outside the imaging plane IM. In this example, the case where the first diaphragm 31 and the first light shielding mask M1 are provided on the surface light source 1 side of the lens 2 is described. For example, the first diaphragm 31 and the first light shielding mask M1 are the workpiece W. Even when it is provided on the side, the same effect can be obtained.
- the irradiation solid angle of the inspection light irradiated to each point of the inspection target formed by the surface light source 1, the first diaphragm 31, the first light shielding mask M1, and the lens 2 in the irradiation light path L1 will be described.
- the optical path is shown in an extended state, and the third diaphragm 33 is omitted.
- FIG. 4A shows an irradiation solid angle formed by light emitted from the lowermost part of the surface light source 1
- FIG. 4B shows an irradiation solid angle formed by light emitted from the center part of the surface light source 1.
- FIG. 4C shows an irradiation solid angle formed by light emitted from the upper side of the surface light source 1.
- the first diaphragm 31 is arranged in the middle of the surface light source 1 and the lens 2 so that the surface light source 1 forms an image on the inspection target W.
- the size of the irradiation solid angle at each point of the image plane IM can be changed uniformly. In other words, the irradiation solid angle is substantially the same at all points on the image plane IM. If the aperture amount of the first diaphragm 31 is increased, the irradiation solid angle can be reduced and the aperture amount of the first aperture 31 can be reduced. If the value is reduced, the irradiation solid angle can be increased.
- the first light shielding mask M1 is provided in the vicinity of the first diaphragm 31, a dark area can be formed in a part of the irradiation solid angle.
- the first light-shielding mask M1 is formed with the light-shielding part M11 so as to shield the light in the vicinity of the optical axis. Therefore, as shown in each diagram of FIG. As for the solid angle, a dark part region having a substantially fine conical shape is formed at the center.
- the irradiation solid angle is formed in a hollow conical light portion region and a fine conical dark portion region fitted in the hollow portion of the bright portion region.
- the size of the outer edge of the bright region that is, the overall size of the irradiation solid angle
- the size of the light shielding portion M11 of the first light shielding mask M can be adjusted.
- the size of the dark area can be adjusted by adjusting.
- the size of the solid angle of the inspection light applied to each point of the inspection target W can be freely controlled by the first diaphragm 31, and the first light shielding mask M1 can be controlled.
- the size, shape, and position of the dark area in the irradiation solid angle can be freely set.
- the half mirror 4 is a circular thin wall supported by a substantially square frame 41.
- a portion where reflection or transmission of the half mirror 4 occurs can be formed thin, and a minute amount generated when reflected light from the inspection object W passes through the half mirror 4.
- An imaging error due to refraction or the like can be minimized.
- the third diaphragm 33 is attached to the opening on the lower surface of the box 93 and is disposed between the half mirror 4 and the inspection object W. With the third diaphragm 33, fine adjustment can be further performed from the irradiation solid angle determined by the first diaphragm 31. In addition, the third diaphragm 33 prevents stray light from entering the inspection light irradiation device when inspection light that has passed through the third diaphragm 33 is reflected by the inspection object W and becomes reflected light. Can do.
- the fourth diaphragm 34 is attached to the upper surface opening of the box 93 and is disposed between the half mirror 4 and the imaging device C.
- the fourth diaphragm 34 is for further adjusting the observation solid angle for observing the reflected light incident on the imaging device C.
- the second cylindrical body 92 is attached to be extendable and contractible so that the distance between the fourth diaphragm 34 and the imaging device C can be adjusted. As a result, it is possible to optimize the light and shade profile with respect to the tilt variation of the reflected light more precisely.
- the dark region of the irradiation solid angle and the observation solid angle can be precisely made the same size on the same axis.
- the illumination is coaxial, if there is no defect, the dark area of the irradiation solid angle and the dark area of the reflected light solid angle completely coincide with each other. Is the same size as the dark area of the irradiation solid angle, as shown in FIG. 5 (a), the dark area of the solid angle of the reflected light and the observation solid angle are completely matched.
- the inspection target W is defective and the solid angle of the reflected light changes in inclination
- the bright region is within the observation solid angle when normal as shown in FIG. Since there was no image, the image was captured only in darkness, but a bright area was partly within the observation solid angle as shown in FIG. That is, the inclination variation of the reflected light of the solid angle can be grasped as the light / dark information of the observation light observed by the imaging device C, and the defect can be detected.
- the first diaphragm 31 is provided, so that the inspection object W is irradiated at each point in the entire irradiation range of the inspection light.
- the size of the irradiation solid angle can be precisely controlled.
- the first light shielding mask M1 provided in the vicinity of the first diaphragm 31 can form a dark part region in the irradiation solid angle without forming a shadow on the imaging plane IM on the inspection target W. it can. And while being able to change the size of the irradiation solid angle, since there is a dark area inside the irradiation solid angle, it is possible to create an aspect in which the amount of light is easily changed within the observation solid angle depending on the presence or absence of defects, It is possible to detect defects that could not be detected in the past.
- the inclusion relationship between the solid angle of the reflected light and the observation solid angle is made suitable for defect detection by adjusting the size of the irradiation solid angle and the shape of the dark area. Since it can be set freely, even a defect or the like that has been difficult to detect in the past can appear as light and shade information of the captured image, and the defect can be detected.
- the inspection system 200 is configured by coaxial illumination. However, as shown in FIG. 7A, the inspection object is irradiated obliquely from above and the inspection object W is imaged by the reflected light.
- the inspection system 200 may be configured with a simple optical system that performs imaging and inspection with the apparatus C. Further, as shown in FIG. 7A, the first diaphragm 31 and the first light shielding mask M1 may be disposed between the lens 2 and the inspection target W.
- the first light shielding mask M1 is provided in the vicinity of the first diaphragm 31, but also a second light shielding mask M2 is provided in the vicinity of the surface light source 1, and the inspection object W is provided.
- the shape accuracy may be inspected.
- the second light-shielding mask M2 is formed with, for example, a lattice-shaped light-shielding portion M11 as shown in FIG. 7B, and a lattice-shaped light and dark portion is formed on the inspection target W.
- the shape of the inspection object W is deviated from a normal shape, the amount of distortion of the grating on the imaging surface IM of the inspection light changes on the inspection object W, so that an error in the shape or the like can be detected. it can.
- the inclusion relationship between the solid angle of the reflected light and the observation solid angle can be well adjusted by the shape of the first diaphragm 31 and the light shielding part M11 of the first light shielding mask M1, etc. Even distortion of the image can be detected as a light / dark difference in the captured image. Accordingly, it is possible to detect a shape error or the like of the inspection target W with high accuracy.
- the irradiation solid angle and the dark area thereof have been described as having a conical shape with a circular bottom surface.
- the irradiation solid angle of the shape and size can be set.
- the opening 31a of the first diaphragm 31 is formed in a substantially rectangular shape, and the light shielding part M11 of the first light shielding mask M1 is also a rectangle smaller than the opening 31a. It is formed in a shape. Also, the observation solid angle is smaller than the dark region of the irradiation solid angle, and the bottom surface is formed as a rectangular quadrangular pyramid. Specifically, the aperture position, aperture shape, and shape or size of the light-shielding portion M11 of the first light-shielding mask disposed at the aperture opening in the imaging optical system including the imaging device C are as shown in FIG. Any viewing solid angle can be formed. The details of the method for forming the shape and size of the observation solid angle are the same as the method for forming the shape and size of the irradiation solid angle and the dark area, and will not be described.
- the solid angle of the reflected light is also formed as a rectangular pyramid. Therefore, in FIG. 8, the display of the irradiation solid angle is omitted, and only the reflected light solid angle is displayed.
- the irradiation solid angle and the shape of the dark area are formed large only on one side.
- the short side direction may be made to coincide with the direction of the defect to be detected.
- the first diaphragm 31 and the first light shielding mask M1 are configured to be rotatable around the optical axis, and the irradiation solid angle and the direction of the dark area on the inspection target W are matched with the inclination direction of the reflected light of the defect. You may be made to do.
- the bottom surface is not only formed with a rectangular irradiation solid angle and a dark part region, but may be irradiated with, for example, an irradiation solid angle inspection light having an elliptical bottom surface. Good.
- a plurality of light shielding portions M11 of the first light shielding mask M1 are formed concentrically, and the dark area and the bright area of the irradiation solid angle are alternately turned from the inside to the outside. It is supposed to be formed. Further, as shown in FIG. 9B, the observation solid angle is smaller than the width of the bright portion region between the dark portion region formed in the central portion of the reflected light solid angle and the dark portion region formed outside thereof. It is formed so that
- the inspection object has a horizontal plane in the center and has two different inspection target surfaces such that an inclined surface surrounding the outer periphery of the horizontal plane in an annular shape is continuously formed, The amount of change in the reflection direction due to the difference in the inclination of each surface can be prevented from being detected by setting the observation solid angle to be included in the outer dark area.
- the change in the reflection direction due to a defect on the horizontal plane is adjusted so that the observation solid angle enters the inner bright area, and only when the change due to the inclined surface and the change due to the defect on the inclined surface are combined
- By adjusting the bright area so that it falls within the observation solid angle it is possible to easily discriminate even if the inclination of each surface is different.
- the optical axis of the lens 2 when the optical axis of the lens 2 is obliquely incident on the inspection target plane Wa of the inspection target W, and the inspection light is irradiated obliquely from above the inspection target plane Wa, If the light emitting plane 1a of the surface light source 1 is arranged in parallel to the main surface 2a of the lens 2, the surface light source 1 can be imaged on the inspection target plane Wa for some, Since the portion is shifted from the imaging position, the imaging surface is blurred.
- the entire surface light source 1 can be imaged, and the shape and size of the irradiation solid angle can be made uniform.
- the shape and size of the irradiation solid angle of the inspection light changes in some areas, which may affect the inspection accuracy.
- the light emission plane 1a of the surface light source 1 is not arranged parallel to the main surface 2a of the lens but is inclined. It is. More specifically, the first virtual plane VP1 including the light emitting plane 1a, the second virtual plane VP2 including the main surface 2a of the lens, and the third virtual plane VP3 including the inspection target plane Wa are in a straight line. They are arranged so that they cross each other.
- the surface light source 1 is provided with a posture adjusting mechanism for changing the distance from the lens 2 along the optical axis and changing the inclination with respect to the main surface 1a.
- the center of the light emitting plane 1a of the surface light source 1 is arranged on the optical axis of the lens 2, and the surface light source 1, the lens 2, the inspection so that the center of the light emitting surface 1a forms an image on the inspection target plane Wa.
- Each separation distance from the target W is set.
- an intersection line between the inspection target plane Wa of the inspection target W and the main surface 2a of the lens 2 is obtained, and a plane passing through the light beam and the center of the light emission plane 1a is defined as a first virtual plane VP1.
- the inclination of the surface light source 1 is adjusted so that the first virtual plane VP1 and the light emission plane 1a coincide with each other to obtain a state as shown in FIG.
- the distance is set so that a Gaussian imaging formula is established between each point on the light emitting surface 1a and each corresponding point on the inspection target plane Wa.
- the entire surface of the light emission plane 1a of the surface light source 1 can be imaged on the inspection target plane Wa.
- the Gaussian imaging formula is satisfied between each point of the light emission plane 1a of the surface light source 1 and the corresponding point of the inspection target plane Wa of the inspection target W.
- the separation distance can be adjusted.
- the surface light source 1 is uniformly imaged on the inspection target plane Wa, and the irradiation solid angle and the size and shape of the dark area can be made uniform. Inspection accuracy can be increased.
- the surface light source 1 is used as the light emitting curved surface. It is only necessary that the shape of the light emitting curved surface 1b is set so that light emitted from each point of the light emitting curved surface 1b forms an image at each point of the curved surface Wb to be inspected by the lens.
- the shape and curvature of the light emitting curved surface 1b may be determined so that a Gaussian imaging formula is established between each point on the inspection target curved surface Wb and each corresponding point on the light emitting curved surface 1b.
- the corresponding light emission curved surface 1b shape can be set by using the same concept.
- the shape of the light shielding portion of the first light shielding mask is circular.
- other shapes such as a polygonal shape such as a triangle and a quadrangle, and a lattice shape may be used.
- the dark area is formed in the irradiation solid angle and the opening amount of the first diaphragm is smaller so as not to block all the inspection light.
- the shape and size of the observation solid angle by the configuration of the imaging optical system can be arbitrarily set with the same configuration. Furthermore, by selecting a combination of an irradiation solid angle and an observation solid angle having an arbitrary shape according to the nature of the defect, a more precise defect inspection can be performed.
- the shape of the light-shielding portion of the second light-shielding mask is not limited to the embodiment, and may be other shapes. For example, various shapes such as a stripe shape, a circular shape, and a polygonal shape may be used.
- the method for setting the observation solid angle is not limited to that shown in each embodiment, and may be set as appropriate based on the dark area of the irradiation solid angle.
- the observation solid angle should include the bright area of the solid angle of the reflected light, and the dark area should fall within the observation solid angle due to the tilt change when there is a defect. It doesn't matter.
- the first light shielding mask is provided close to the first diaphragm.
- the first light shielding mask may be disposed in the vicinity of the first diaphragm, and may be slightly separated.
- the imaging surface of the surface light source only needs to be in the vicinity of the inspection object and does not have to be strictly imaged on the inspection object.
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Abstract
Description
100 :検査用照明装置
1 :面光源
11 :光射出面
12 :放熱フィン
2 :レンズ
31 :第1絞り
32 :第2絞り
33 :第3絞り
34 :第4絞り
4 :ハーフミラー
41 :枠体
91 :第1筒状体
92 :第2筒状体
93 :箱体
C :撮像装置
IM :結像面
L1 :照射光路
L11 :第1光路
L12 :第2光路
L2 :反射光路
M1 :第1遮光マスク
M2 :第2遮光マスク
W :検査対象
第1実施形態の検査用照明装置100と、撮像装置Cにより構成される検査システム200は、検査対象Wを撮像する方向と、検査対象Wを照明する方向とが一致している、いわゆる、同軸照明であり、検査対象Wの欠陥が撮像装置Cにより撮像された画像中に明暗差として現れるようにするために用いられるものである。ここで、検査対象Wの欠陥などの特徴点とは、例えば、表面の傷や、外観の形状、穴の有無等多岐に亘る不具合やその他の特徴種を含むものである。
Claims (8)
- 検査対象に検査光を照射する検査用照明装置と、前記検査対象において反射又は散乱する光を撮像する撮像装置とからなる検査システムであって、
前記検査用照明装置が、
検査光を射出する面光源と、
前記面光源と前記検査対象との間に設けられ、前記面光源を前記検査対象の近傍において結像させるレンズと、
前記面光源と前記検査対象との間に設けられ、前記検査対象の各点に照射される検査光の照射立体角中に暗部領域を形成する第1遮光マスクと、を備えており、
前記撮像装置が、
前記検査用照明装置から前記検査対象の各点に照射される検査光の照射立体角における暗部領域の形状又は大きさに基づいて観察立体角の形状又は大きさが設定されていることを特徴とする検査システム。 - 前記観察立体角の大きさが前記照射立体角の暗部領域の大きさと略同じに設定されている請求項1記載の検査システム。
- 前記レンズの焦点に対して所定の位置に配置される第1絞りをさらに備えた請求項1記載の検査システム。
- 前記第1遮光マスクが、前記第1絞りの近傍に設けられており、前記第1遮光マスクの遮光部が前記第1絞りの開口径よりも小さく形成されている請求項3記載の検査システム。
- 所定のマスクパターンが形成された第2遮光マスクが、前記面光源の射出側近傍に設けられている請求項1に記載の検査システム。
- 前記面光源が発光平面を有しており、
前記レンズの光軸が前記検査対象上の検査対象平面に対して斜めに入射するように配置されており、
前記発光平面を含む第1仮想平面と、前記レンズの主面を含む第2仮想平面と、前記検査対象平面を含む第3仮想平面とが一直線上で交わるように配置されている請求項1に記載の検査システム。 - 前記面光源が発光曲面を有しており、
前記発光曲面の各点から射出された光が前記レンズにより前記検査対象曲面の各点において結像するように、当該発光曲面の形状が設定されている請求項1に記載の検査システム。 - 検査光を射出する面光源と、
前記面光源と前記検査対象との間に設けられ、前記面光源を前記検査対象の近傍において結像させるレンズと、
前記面光源と前記検査対象との間に設けられ、前記検査対象の各点に照射される検査光の照射立体角中に暗部領域を形成する第1遮光マスクと、を備えたことを特徴とする検査用照明装置。
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US14/649,200 US9638641B2 (en) | 2012-12-03 | 2013-11-25 | Inspection system and inspection illumination device |
DE112013005764.6T DE112013005764T5 (de) | 2012-12-03 | 2013-11-25 | Prüfsystem und Prüf-Beleuchtungsvorrichtung |
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DE102019102466A1 (de) * | 2019-01-31 | 2020-08-06 | Endress+Hauser Conducta Gmbh+Co. Kg | Optischer Sensor |
JP2021085815A (ja) * | 2019-11-29 | 2021-06-03 | シーシーエス株式会社 | 光照射装置、検査システム、及び、光照射方法 |
KR102361860B1 (ko) * | 2020-06-14 | 2022-02-14 | 머신 비전 라이팅 가부시키가이샤 | 검사 측정용 조명 장치 및 검사 측정 시스템 및 검사 측정 방식 |
CN112098425B (zh) * | 2020-11-17 | 2021-11-23 | 北京领邦智能装备股份公司 | 高精度的成像系统、方法、图像采集装置及检测设备 |
CN113466246B (zh) * | 2020-11-17 | 2024-05-10 | 北京领邦智能装备股份公司 | 高精度的成像系统、方法、图像采集装置及检测设备 |
JP7458617B1 (ja) | 2023-12-02 | 2024-04-01 | マシンビジョンライティング株式会社 | 検査用照明装置及び照明光学系及び検査システム |
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US9638641B2 (en) | 2017-05-02 |
US20150316488A1 (en) | 2015-11-05 |
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