WO2014129358A1 - 透明板状体表面検査用撮像システム - Google Patents
透明板状体表面検査用撮像システム Download PDFInfo
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- WO2014129358A1 WO2014129358A1 PCT/JP2014/053212 JP2014053212W WO2014129358A1 WO 2014129358 A1 WO2014129358 A1 WO 2014129358A1 JP 2014053212 W JP2014053212 W JP 2014053212W WO 2014129358 A1 WO2014129358 A1 WO 2014129358A1
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- WIPO (PCT)
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- line sensor
- sensor camera
- light source
- transparent plate
- glass plate
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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
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
- G01B11/2518—Projection by scanning of the object
- G01B11/2522—Projection by scanning of the object the position of the object changing and being recorded
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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
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/245—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures using a plurality of fixed, simultaneously operating transducers
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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
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
- G01B11/306—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces for measuring evenness
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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
Definitions
- the present invention relates to an imaging system for inspecting the surface of a transparent plate, which acquires an image formed by a light path change caused by reflection on the surface of the transparent plate during light source imaging for inspection of the surface shape of the transparent plate.
- a line sensor camera (line sensor camera) is used to image the light source stripe pattern (stripe pattern) by following the path of light reflected from the surface of the glass plate. And the method of inspecting the presence or absence of the distortion of the glass plate surface based on the image data obtained by imaging, and the degree of distortion is known.
- the stripe pattern a pattern in which lines that become dark portions are arranged at regular intervals is often used.
- the glass plate to be inspected is irradiated with the stripe pattern while being conveyed in a certain direction. In the image obtained as a result of imaging, streaks corresponding to the dark part of the stripe pattern appear. Note that the pixels of the line sensor camera have the same size and are arranged at equal intervals.
- FIG. 9 is an explanatory diagram showing a general light path between the light source and the line sensor camera.
- the side where the support part 72 that supports the glass plate 71 is present is referred to as the back side, and the opposite side is referred to as the front side.
- the solid line shown in FIG. 9 indicates the path of light reflected by the surface on the front side of the glass plate 71.
- the broken line shown in FIG. 9 shows the path
- the distance P shown in FIG. 9 depends on the thickness of the glass plate 71.
- the mode shown in FIG. 10 can be considered.
- the arrows shown in FIG. 10 indicate the conveyance direction of the glass plate 71.
- the center line of the irradiated surface is considered.
- the arrangement shown in FIG. 10 corresponds to the case where the plane on which the center of the light path of the line sensor camera 82 exists is perpendicular to the glass plate and perpendicular to the conveyance direction of the glass plate.
- the optical axis of the camera means a perpendicular line that passes through the center of the camera lens and is perpendicular to the lens surface.
- the ray path center is the ray path that coincides with the optical axis of the line sensor camera, and the ray from the reflection point on the glass plate (assuming that no distortion has occurred) corresponding to the ray path to the light source. This means a ray path combined with the path.
- FIG. 10 shows a mode in which the light source 81 irradiates the stripe pattern on the glass plate 71 and the line sensor camera 82 photographs the light source 81 via the glass plate 71 in a plane perpendicular to the conveyance direction of the glass plate 71. ing. At this time, since light is reflected on the front side surface and the back side surface of the glass plate, two stripes corresponding to one dark part of the stripe pattern appear in the image.
- FIG. 11 is a schematic diagram showing an example of an image obtained by imaging.
- the streaks generated by the reflection on the front side surface are indicated by solid lines, and the streaks generated by the reflection on the back side surface are schematically indicated by broken lines.
- the distance between the two types of streaks is referred to as a separation distance D.
- the separation distance D between the streaks generated by the reflection on the front surface and the streaks generated by the reflection on the back surface is a size dependent on the thickness of the glass plate.
- the glass plate is not distorted. Further, if there is variation in the interval, the degree of distortion of the glass plate can be evaluated based on the interval.
- FIG. 12 is a schematic diagram illustrating an example of an image in which a portion where the separation distance D approaches and it is unclear whether the line is a single line or a single line is generated.
- the measurement precision of the distortion of a glass plate will fall.
- the interval of the separation distance D see FIG. 11
- the thinner the plate thickness the more likely the measurement accuracy of distortion is reduced.
- FIG. 13 is an explanatory diagram illustrating a light path between the light source and the line sensor camera when a water layer is disposed on the back side of the glass plate.
- the water layer 73 is provided between the glass plate 71 and the support portion 72. Since the refractive index of the water layer 73 is substantially the same as the refractive index of the glass plate 71, almost no light is reflected by the surface on the back side of the glass plate 71.
- the line sensor camera 82 continuously photographs the light source 81 via the visual field 85. Therefore, the glass plate 71 can be inspected as a surface.
- the light beam path from each pixel of the line sensor camera 82 to the visual field 85 through the lens does not change depending on the occurrence of distortion of the glass plate 71 and is fixed. However, the light path from the visual field 85 to the light source 81 varies depending on the state of occurrence of distortion of the glass plate 71.
- the irradiation surface 81a of the light source 81 is directed toward the visual field 85 of the line sensor camera 82 and irradiates a stripe pattern.
- the irradiation surface 81a is an elongated rectangle, the surface where the irradiation surface 81a exists and the surface where the glass plate 71 exists intersect, and the short side of the irradiation surface 81a is parallel to the conveying direction of the glass plate 71. Be placed.
- each dark part 81b is provided at equal intervals so that it may become parallel to the short side of the irradiation surface 81a.
- a portion other than the dark portion is referred to as a bright portion.
- FIG. 14 shows the result of projecting the light path from the lens of the line sensor camera 82 shown in FIG. 10 to the light source 81 via the visual field 85 and the irradiation surface 81a of the light source 81 onto a surface perpendicular to the conveying direction of the glass plate. It is a schematic diagram shown. Strictly speaking, FIG. 14 shows a result of projection from the downstream side to the upstream side along the axis in the conveyance direction of the glass plate. In the present specification, the results of projection from the downstream side to the upstream side along the axis in the conveyance direction of the glass plate are also shown for other drawings showing the projection results.
- the light path from each pixel of the line sensor camera 82 to the visual field 85 through the lens does not change depending on the state of occurrence of distortion of the glass plate 71 and is fixed.
- the light path from the field of view 85 to the light source 81 is reflected in the imaging state of the irradiation surface 81a. That is, if the light path from the field of view 85 to the light source 81 corresponding to a certain pixel is a dark part on the irradiation surface 81a, the output of the pixel indicates black. If the light path from the field of view 85 to the light source 81 is a bright part on the irradiation surface 81a, the output of the pixel indicates white.
- the ray path from the visual field 85 to the light source 81 does not change, so that the streaks appearing in the image are equally spaced.
- the light path from the visual field 85 to the light source 81 corresponding to a certain pixel changes from a dark part to a bright part on the irradiation surface 81a, or changes from a bright part to a dark part.
- the streaks appearing in the image become unequal intervals.
- the result of projecting the irradiation surface 81a of the light source 81 onto a surface perpendicular to the conveyance direction of the glass plate is a line segment as shown in FIG.
- the light beam path from the visual field 85 corresponding to each pixel to the light source 81 intersects with the irradiation surface 81a, which is a line segment, at a single point and is uniquely determined.
- FIG. 15 a mode shown in FIG. 15 can be considered.
- the arrows shown in FIG. 15 indicate the conveyance direction of the glass plate 71.
- FIG. 15 corresponds to the case where the center of the light path of the line sensor camera 82 is in a plane parallel to the conveyance direction of the glass plate 71 and perpendicular to the glass plate.
- the line sensor camera 82 continuously photographs the light source 81 via the visual field 85.
- the light beam path from each pixel of the line sensor camera 82 to the visual field 85 through the lens does not change depending on the state of occurrence of distortion of the glass plate 71 and is fixed.
- the irradiation surface 81 a of the light source 81 is arranged so as to be parallel to the glass plate 71, and the short side thereof is provided so as to be parallel to the conveying direction of the glass plate 71. . That is, the irradiation surface 81a irradiates the stripe pattern directly facing the glass plate 71. Also in this example, the irradiation surface 81a is an elongated rectangle. And each dark part 81b is provided so that it may become parallel to the short side of the irradiation surface 81a.
- FIG. 16 shows the result of projecting the light path from the lens of the line sensor camera 82 shown in FIG. 15 toward the light source 81 via the visual field 85 and the irradiation surface 81a of the light source 81 onto a surface perpendicular to the conveyance direction of the glass plate. It is a schematic diagram shown. As already described, the light beam path from each pixel of the line sensor camera 82 to the visual field 85 through the lens is not changed depending on the occurrence of distortion of the glass plate 71 and is fixed. Of the light ray paths corresponding to a certain pixel, the light ray path from the visual field 85 to the light source 81 is reflected in the imaging state of the irradiation surface 81a.
- the output of the pixel indicates black. If the light path from the field of view 85 to the light source 81 is a bright part on the irradiation surface 81a, the output of the pixel indicates white. Therefore, if the glass plate 71 is not distorted, the ray path from the visual field 85 to the light source 81 does not change, so that the streaks appearing in the image are equally spaced.
- the light path from the visual field 85 to the light source 81 corresponding to a certain pixel changes from a dark part to a bright part on the irradiation surface 81a, or changes from a bright part to a dark part.
- the streaks appearing in the image become unequal intervals.
- the result of projecting the irradiation surface 81a of the light source 81 onto a surface perpendicular to the conveyance direction of the glass plate is a line segment as shown in FIG. Therefore, the light ray path from the visual field 85 corresponding to each pixel to the light source 81 intersects with the irradiation surface 81a which is a line segment at one point, and is uniquely determined.
- the irradiation surface 81 a is not inclined in parallel to the glass plate 71, but the irradiation surface 81 a is inclined toward the conveyance direction side of the glass plate 71. That is, it is assumed that the light source 81 is rotated from a state in which the irradiation surface 81 a faces the glass plate 71 so that the irradiation surface 81 a of the light source 81 faces the downstream side in the conveyance direction of the glass plate 71.
- the result of projecting the light path from the lens of the line sensor camera 82 to the light source 81 via the visual field 85 and the irradiation surface 81a onto a surface perpendicular to the conveyance direction of the glass plate is as shown in FIG.
- the projection result of the irradiation surface 81a is a surface.
- a plurality of light beam paths from the visual field 85 to the line of the dark portion 81b of the light source 81 can be selected. Therefore, in the light ray path 91, the light ray path from the reflection point on the glass plate 71 to the dark part 81b cannot be uniquely determined from the captured image. Therefore, in the arrangement mode shown in FIG. 15, the irradiation surface 81 a of the light source 81 needs to be parallel to the glass plate 71. In FIG. 17, only one dark part 81b is shown, but there are a plurality of dark parts 81b on the irradiation surface 81a.
- FIG. 15 is an arrangement mode in which the separation phenomenon of the distance P shown in FIG. 9 is not utilized.
- FIG. 18 is a schematic diagram showing a result of projecting the light path from the lens of the line sensor camera 82 toward the visual field 85 and the irradiation surface 81a of the light source 81 in the arrangement mode shown in FIG. 15 when no water layer is provided. . When the water layer is not provided, reflection on the surface on the back side of the glass plate 71 also occurs as shown by a broken line in FIG.
- the light path reflected by the front surface of the glass plate 71 and the light path reflected by the back surface almost overlap each other, so that the front surface does not depend on the separation distance D.
- the streaks generated by reflection on the surface overlap with the streaks generated by reflection on the back surface.
- measurement accuracy decreases. Even when a water layer is provided, if the streaks caused by reflection on the back surface cannot be completely eliminated, the same problem occurs, and the measurement accuracy decreases.
- Japanese Unexamined Patent Publication No. 2012-21781 paragraphs 0033, 0034
- Japanese Unexamined Patent Publication No. 2009-128098 FIG. 1
- FIG. 10 shows an example in which the visual field of the line sensor camera is shifted along the conveyance direction.
- FIG. 19 shows a state in which the glass plate 71 is viewed from above. Moreover, the arrow shown in FIG. 19 has shown the conveyance direction of the glass plate 71.
- six sets of the light source 81 and the line sensor camera (not shown) are provided, and an image for inspecting the entire lateral width of the glass plate 71 by performing imaging on the six visual fields 85. Is obtained.
- the present invention provides a front side when the plane on which the light path center of the line sensor camera exists is perpendicular to the transparent plate and the plane is not parallel or perpendicular to the transport direction of the transparent plate. While increasing the number of mechanisms for providing a water layer on the back side of the transparent plate-like body, utilizing the phenomenon that the reflected light path on the back surface and the reflected light path on the back side are separated depending on the plate thickness An object of the present invention is to provide an imaging system for transparent plate surface inspection that can be suppressed.
- An imaging system for inspection of a surface of a transparent plate is a line sensor camera that captures an image of a transparent plate to be transported from an oblique direction, and is arranged so that the field of view is orthogonal to the transport direction of the transparent plate.
- a light source for irradiating the stripe pattern, and the direction of the irradiation surface of the stripe pattern of the light source is determined so that the result of projecting the irradiation surface along the traveling direction of the transparent plate is a line segment, A line that is a dark portion of the stripe pattern on the irradiation surface is parallel to the transport direction of the transparent plate-like body.
- the ray path coincides with the optical axis of the line sensor camera, the reflection point on the transparent plate-like body corresponding to the ray path, and the light source.
- the condition that the plane is neither parallel nor perpendicular to the transport direction of the transparent plate-like body is satisfied.
- the imaging system for transparent plate surface inspection is a line sensor camera for photographing a transparent plate to be conveyed, and is arranged so that the field of view is orthogonal to the conveyance direction of the transparent plate.
- a line sensor camera and a light source having a rectangular irradiation surface and irradiating a stripe pattern from the irradiation surface, the starting point of the light path extending from the line sensor camera, the field of view of the line sensor, and the longitudinal direction of the irradiation surface
- the line sensor camera and the light source are rotated in opposite directions with the visual field as the central axis.
- the line sensor camera and the light source are arranged so that the direction of the irradiation surface of the stripe pattern of the light source is a result of projecting the irradiation surface along the traveling direction of the transparent plate Determined to be a line segment, the dark portion to become the line of the stripe pattern in the irradiation plane is characterized in that it is parallel to the conveying direction of the transparent plate-shaped object.
- a plurality of sets of line sensor cameras and light sources may be provided, and each set of line sensor cameras and light sources may be arranged so that the field of view of each line sensor camera is aligned on a straight line.
- elimination means to erase the back surface reflection of a transparent plate-shaped body may be sufficient.
- the front side While increasing the number of mechanisms for providing a water layer on the back side of the transparent plate-like body, utilizing the phenomenon that the reflected light path on the back surface and the reflected light path on the back side are separated depending on the plate thickness Can be suppressed.
- FIG. 1 The perspective view which shows the example of the imaging system for transparent plate-shaped body surface inspection of this invention.
- the perspective view which shows typically the light beam path
- FIG. The schematic diagram which shows the result of having projected the light ray path which goes to the light source 1 from the line sensor camera 2 shown in FIG. 2 via the visual field 5, and the irradiation surface 1a of the light source 1 on the surface perpendicular
- vertical to the conveyance direction of a glass plate may turn into a surface.
- FIG. 11 is a schematic diagram illustrating a result of projecting a light path from a lens of the line sensor camera 82 illustrated in FIG. 10 to a light source 81 via a visual field 85 and an irradiation surface 81a of the light source 81 onto a surface perpendicular to a conveyance direction of a glass plate.
- the perspective view which shows the other example of the arrangement
- the schematic diagram which shows the result of having projected the light ray path which goes to the light source 81 from the lens of the line sensor camera 82 shown in FIG. 15 via the visual field 85, and the irradiation surface 81a of the light source 81 on the surface perpendicular
- FIG. FIG. 16 is a schematic diagram showing a result of projecting the light path from the lens of the line sensor camera 82 toward the visual field 85 and the irradiation surface 81a of the light source 81 in the arrangement mode shown in FIG. 15 when no water layer is provided.
- Explanatory drawing which shows the example of arrangement
- the top view which shows the example of arrangement
- the transparent plate-like object to be inspected is a glass plate
- the present invention is also applicable to inspection of a transparent plate-like body other than a glass plate.
- FIG. 1 is a perspective view showing an example of an imaging system for transparent plate surface inspection according to the present invention.
- the imaging system for transparent plate surface inspection of the present invention includes a light source 1 and a line sensor camera 2.
- the light source 1 irradiates the stripe pattern on the glass plate 71 to be inspected for distortion
- the line sensor camera 2 is an image of the stripe pattern in the light source 1 on the extension following the light path reflected from the surface of the glass plate 71.
- An image is generated by imaging.
- the glass plate 71 is conveyed while being supported by a glass plate support (not shown in FIG. 1).
- the arrows shown in FIG. 1 indicate the conveyance direction of the glass plate 71.
- a water layer (not shown in FIG. 1) is provided on the surface on the back side of the portion corresponding to the visual field 5 of the line sensor camera 2. In the subsequent drawings, illustration of the glass plate support and the water layer is omitted.
- the line sensor camera 2 is the same as the line sensor camera 82 shown in FIG. 10 and continuously shoots the light source 1 via the visual field 5. Therefore, the glass plate 71 can be inspected as a surface.
- the plane on which the center of the light path of the line sensor camera 82 exists is provided so as to be perpendicular to the glass plate 71 and also perpendicular to the conveying direction of the glass plate 71.
- the line sensor camera 82 images the light source 81 via the glass plate 71.
- the plane on which the light path center of the line sensor camera 2 (see FIG. 1) exists is perpendicular to the glass plate 71, and
- the line sensor camera 2 is arranged so that the line sensor camera 2 photographs the light source 1 via the glass plate 71 in a state that is neither perpendicular nor parallel to the transport direction.
- the center of the light path of the line sensor camera 2 (the light path combined with the light path that matches the optical axis of the line sensor camera 2 and the light path after the reflection point on the glass plate corresponding to the light path). It is assumed that the glass plate in the case where the existing plane is defined satisfies the condition that no distortion occurs (in other words, the condition that it is flat). However, the line sensor camera 2 is disposed above the glass plate 71 in consideration of interference with the transport mechanism. The line sensor camera 2 is arranged so that the visual field 5 of the line sensor camera 2 is orthogonal to the conveyance direction of the glass plate 71.
- FIG. 1 illustrates the case where the line sensor camera 2 is arranged downstream of the visual field 5 in the transport direction, but the line sensor camera 2 may be arranged upstream of the visual field 5. Good.
- the light source 1 has an elongated rectangular irradiation surface and irradiates a stripe pattern from the irradiation surface.
- the line sensor camera 2 is arranged so that the plane on which the light path center of the line sensor camera 2 exists is perpendicular to the glass plate 71 and also perpendicular to the conveying direction of the glass plate. Assume a state. In this state, the visual field 5 is orthogonal to the conveyance direction of the glass plate 71.
- the plane includes the origin of the light path extending from the line sensor camera 2, the visual field 5 of the line sensor camera 2, and the central axis of the irradiation surface along the longitudinal direction of the irradiation surface of the light source 1. Is orthogonal to the conveying direction of the glass plate 71. From this state, the line sensor camera 2 is arranged at a position where the line sensor camera 2 is rotated with the visual field 5 as the central axis. The posture of the line sensor camera 2 at this time corresponds to the posture of the line sensor camera 2 shown in FIG.
- the amount of rotation when rotating the line sensor camera 2 around the visual field 5 from the above assumed state as the central axis is higher than the front surface of the glass plate 71 in consideration of interference with the transport mechanism. If the condition that 2 is located is satisfied, there is no particular limitation.
- the plane on which the light path center of the line sensor camera 2 exists is perpendicular to the glass plate 71 and may be parallel or perpendicular to the conveyance direction of the glass plate 71. No state.
- the visual field 5 in the posture of the line sensor camera 2 shown in FIG. 1 is the same as the visual field 5 in the assumed state.
- the posture of the line sensor camera 2 can be determined with the visual field 5 fixed.
- the light beam path from each pixel of the line sensor camera 2 to the visual field 5 through the lens does not change depending on the state of occurrence of distortion of the glass plate 71 and is fixed. However, the light path from the visual field 5 to the light source 1 changes depending on the occurrence of distortion of the glass plate 71.
- the light source 1 has an elongated rectangular irradiation surface and irradiates a stripe pattern from the irradiation surface.
- the surface facing the glass plate 71 side in the light source 1 is an irradiation surface.
- dark portions are provided in parallel at regular intervals. The stripe pattern on the irradiation surface of the light source 1 in the present invention will be described later.
- the light source 1 has a light path from the lens of the line sensor camera 2 toward the field of view 5 as glass. It arrange
- the line sensor camera 2 is arranged so that the plane on which the light path center of the line sensor camera 2 exists is perpendicular to the glass plate 71 and also perpendicular to the conveying direction of the glass plate.
- the visual field 5 at this time is the same as the visual field 5 shown in FIG.
- the plane that includes is orthogonal to the transport direction of the glass plate 71.
- the light source 1 is rotated with the visual field 5 as the central axis. Then, the light source 1 is arranged on the light beam path when the light beam path from each pixel of the line sensor camera 2 shown in FIG. 1 toward the visual field 5 through the lens is reflected by the surface on the front side of the glass plate 71.
- the line sensor camera 2 is also arranged at a position rotated from the assumed state with the visual field 5 as the central axis. That is, both the line sensor camera 2 and the light source 1 are arranged at a position rotated from the assumed state with the visual field 5 as the central axis.
- the direction in which the visual field 5 is rotated from the assumed state as the central axis is opposite in the line sensor camera 2 and the light source 1.
- the amount of rotation of the line sensor camera 2 from the assumed state is preferably equal to the amount of rotation of the light source 1.
- the direction of the irradiation surface of the light source 1 is determined so that the result of projecting the irradiation surface of the light source 1 onto a surface perpendicular to the conveying direction of the glass plate becomes a line segment.
- the posture of the light source 1 is determined. In FIG. 1, the posture of the light source 1 is shown.
- FIG. 2 is a perspective view schematically showing a light beam path from the lens of the line sensor camera 2 to the light source 1 via the visual field 5 and an irradiation surface 1 a of the light source 1.
- the line sensor camera 2 is also not shown in the appearance of the line sensor camera 2.
- the arrow shown in FIG. 2 has shown the conveyance direction of the glass plate 71 similarly to FIG.
- FIG. 3 is a schematic diagram showing a result of projecting the light path from the camera 2 shown in FIG. 2 toward the light source 1 via the visual field 5 and the irradiation surface 1a of the light source 1 onto a surface perpendicular to the conveying direction of the glass plate. is there.
- the irradiation surface 1a shown in FIG. 2 becomes a line segment as shown in FIG. 3 when projected onto a surface perpendicular to the conveying direction of the glass plate.
- the result of projection from the downstream side to the upstream side along the axis in the conveyance direction of the glass plate is illustrated and described as the projection result, but the upstream side along the axis in the conveyance direction of the glass plate is described.
- the result of projection from the downstream side to the downstream side may be used. In any case, the configuration of the present invention can be explained.
- the light beam path from each pixel of the line sensor camera 2 to the visual field 5 through the lens does not change depending on the occurrence of distortion of the glass plate 71 and is fixed.
- the light ray path from the visual field 5 to the light source 1 is reflected in the imaging state of the irradiation surface 1a. That is, if the light path from the visual field 5 to the light source 1 corresponding to a certain pixel is a dark part on the irradiation surface 1a, the output of the pixel shows black. If the light path is a bright part on the irradiation surface 1a, the output of the pixel is white.
- the ray path from the visual field 5 to the light source 1 does not change, so that the streaks appearing in the image are equally spaced.
- the glass plate 71 is distorted, the light path from the visual field 5 to the light source 1 corresponding to a certain pixel changes from the dark part to the bright part of the irradiation surface 1a, or changes from the bright part to the dark part.
- the streaks appearing in the image become unequal intervals.
- FIG. 4 is a schematic diagram showing a projection result in this case.
- FIG. 4 only one dark part 1b is illustrated, but a plurality of dark parts 1b are provided.
- both a bright part and a dark part exist in the surface used as the projection result of the irradiation surface 1a. Therefore, as in the case shown in FIG.
- the light source 1 shown in FIG. 1 needs to satisfy the condition that the result of projecting the irradiation surface 1a of the light source 1 onto a surface perpendicular to the conveyance direction of the glass plate becomes a line segment.
- the state of each pixel of the line sensor camera 2 can be uniquely determined.
- the stripe pattern provided on the irradiation surface 1a (see FIG. 2) of the light source 1 will be described.
- the dark line is provided in parallel with the conveying direction of the glass plate 71 in the posture of the light source 1 determined as described above.
- a plurality of lines that are dark portions are provided at equal intervals. Each line which becomes a dark part is parallel.
- the portion other than the dark portion is a bright portion.
- FIG. 5 is a schematic view showing a result of projecting a dark line of the stripe pattern onto a surface perpendicular to the conveyance direction of the glass plate.
- the dark line 1 b is a surface perpendicular to the conveyance direction of the glass plate. Projected into a point.
- the dark portions 1b are arranged at equal intervals as dots.
- FIG. 6 shows a state in which the stripe pattern thus determined is observed from the front.
- the dark part 1b in a stripe pattern becomes diagonal with respect to the short side of the irradiation surface 1a.
- the dark portion is parallel to the short side of the irradiation surface 1a as in the case shown in FIG. Then, under the condition that the glass plate 71 is not distorted, the light source 1 is positioned at a position corresponding to the extension direction in which the light path from the line sensor camera 2 toward the visual field 5 is reflected by the surface on the front side of the glass plate 71. , And when the irradiation surface 1a of the light source 1 is projected onto a surface perpendicular to the conveyance direction of the glass plate to satisfy the condition that a line segment is obtained, the line that becomes the dark part of the stripe pattern is conveyed to the glass plate.
- the result of projection onto a plane perpendicular to the direction is as shown in FIG. That is, the result of projecting the dark part 1b onto a surface perpendicular to the glass plate transport direction is a line segment as shown in FIG. 7, and has a width.
- the result of projecting the dark part 1b onto a surface perpendicular to the glass plate transport direction is a line segment as shown in FIG. 7, and has a width.
- a dark part 1b is provided as illustrated in FIG. 6 instead of providing a dark part parallel to the short side of the irradiation surface 1a. Strictly speaking, the dark portion 1b is provided so as to satisfy the condition that the line of the dark portion is parallel to the conveyance direction of the glass plate 71 in the posture of the light source 1.
- the dark portions 1b are arranged at regular intervals as dots as shown in FIG. Therefore, if the glass plate 71 is not distorted, the streaks appearing in the image are equally spaced. Moreover, if distortion has arisen, dispersion
- the separation phenomenon of the distance P shown in FIG. A phenomenon in which the path of the reflected light on the front side surface and the path of the reflected light on the back side surface are separated depending on the plate thickness can be used.
- the light path reflected on the front surface of the glass plate 71 and the light path reflected on the back surface Do not overlap (see FIG. 18), and it is possible to prevent a decrease in measurement accuracy.
- the plane on which the light path center of the line sensor camera 2 exists is perpendicular to the glass plate 71 and not perpendicular to the conveying direction of the glass plate 71. Therefore, when viewed from directly above, the light source 1 and the line sensor camera 2 are not overlapped with the extension lines of the other line sensor camera and the other light source, respectively, and do not interfere with the visual field of the line sensor camera.
- a plurality of sets of the light source 1 and the line sensor camera 2 can be arranged. Therefore, even if a plurality of sets of the light source 1 and the line sensor camera 2 are provided and the sets are arranged so that the field of view 5 of each set of the line sensor cameras 2 is linear, no interference occurs in each set.
- FIG. 8 is an explanatory diagram showing a situation where a plurality of sets of the light source 1 and the line sensor camera 2 are arranged as described above.
- FIG. 8 illustrates a situation in which each light source and each line sensor camera is viewed from directly above.
- four combinations of the light source 1 and the line sensor camera 2 are shown.
- the field of view 5 of each set of line sensor cameras 2 is arranged in a straight line. As a result, the distortion of the wide glass plate 71 shown in FIG. 8 can be inspected with high accuracy.
- a mechanism for providing a water layer (not shown) on the back surface of the glass plate 71 is provided at a location corresponding to the field of view 5. It is sufficient to provide one for each. Therefore, in the present invention, even if the plane on which the light path center of the line sensor camera exists is perpendicular to the glass plate and the plane is not parallel to the conveyance direction of the glass plate, An increase in the number of mechanisms for providing the water layer can be suppressed.
- back surface reflection erasing means since the reflection (back surface reflection) on the back surface of the glass plate 71 can be eliminated by the water layer, the mechanism for providing the water layer on the back side of the glass plate may be referred to as back surface reflection erasing means.
- a line that is a dark part of the stripe pattern may not be parallel to the glass transport direction.
- the present invention is suitably applied to image generation for inspection of the surface shape of a transparent plate-like body such as a glass plate.
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Abstract
Description
本出願は、2013年2月19日出願の日本特許出願(特願2013-030061)に基づくものであり、その内容はここに参照として取り込まれる。
1a、81a 照射面
1b、81b 暗部
2、82 ラインセンサカメラ
5、85 視野
71 ガラス板
Claims (5)
- 搬送される透明板状体を斜め方向から撮影するラインセンサカメラであって、視野が前記透明板状体の搬送方向と直交するように配置されるラインセンサカメラと、
前記透明板状体に歪みが生じていないという条件のもとで、前記ラインセンサカメラから当該ラインセンサカメラの視野に向かう光線経路が前記透明板状体で反射した延長方向上に配置され、ストライプパターンを照射する光源とを備え、
前記光源のストライプパターンの照射面の向きは、当該照射面を透明板状体の進行方向に沿って射影した結果が線分になるように定められ、
前記照射面でストライプパターンの暗部となる線は、前記透明板状体の搬送方向と平行である
ことを特徴とする透明板状体表面検査用撮像システム。 - 透明板状体に歪みが生じていないという条件のもとで、ラインセンサカメラの光軸に一致する光線経路と、当該光線経路に対応する、前記透明板状体上の反射点以降、光源までの光線経路とを含む平面を想定した場合に、当該平面が透明板状体の搬送方向と平行でも垂直でもないという条件を満たす
請求項1に記載の透明板状体表面検査用撮像システム。 - 搬送される透明板状体を撮影するラインセンサカメラであって、視野が前記透明板状体の搬送方向と直交するように配置されるラインセンサカメラと、
矩形の照射面を有し、当該照射面からストライプパターンを照射する光源とを備え、
前記ラインセンサカメラから延びる光線経路の起点と、前記ラインセンサカメラの視野と、前記照射面の長手方向に沿った前記照射面の中心軸とを含む平面が前記搬送方向に直交している状態を想定し、その想定した状態から、前記視野を中心軸として前記ラインセンサカメラおよび前記光源を互いに逆向きに回転させた状態になるように、前記ラインセンサカメラおよび前記光源は配置され、
前記光源のストライプパターンの照射面の向きは、当該照射面を透明板状体の進行方向に沿って射影した結果が線分になるように定められ、
前記照射面でストライプパターンの暗部となる線は、前記透明板状体の搬送方向と平行である
ことを特徴とする透明板状体表面検査用撮像システム。 - 前記ラインセンサカメラと前記光源との組を複数備え、前記ラインセンサカメラと前記光源との各組は、各ラインセンサカメラの視野が直線上に並ぶように配置される
請求項1から請求項3のうちのいずれか1項に記載の透明板状体表面検査用撮像システム。 - 透明板状体の裏面反射を消す裏面反射消去手段を有する請求項1から請求項4のうちのいずれか1項に記載の透明板状体表面検査用撮像システム。
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JP6642223B2 (ja) * | 2016-04-13 | 2020-02-05 | Agc株式会社 | 透明板表面検査装置、透明板表面検査方法、およびガラス板の製造方法 |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0273140A (ja) * | 1988-05-13 | 1990-03-13 | Saint Gobain Vitrage | 板ガラスまたは板ガラス製品の光学的品質を決定する方法および該方法を実施する装置 |
JP2001502800A (ja) * | 1996-10-18 | 2001-02-27 | インノメス・ゲゼルシャフト・フュア・メステクニク・エム・ベー・ハー | 反射表面の経路を測定する方法及び装置 |
JP2010513925A (ja) * | 2006-12-19 | 2010-04-30 | ピルキングトン・ノースアメリカ・インコーポレイテッド | 車両用成形ガラスのひずみを反射された光学像により自動的に定量分析する方法 |
WO2011158869A1 (ja) * | 2010-06-15 | 2011-12-22 | 旭硝子株式会社 | 形状測定装置、形状測定方法、およびガラス板の製造方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1297796C (zh) * | 2003-07-02 | 2007-01-31 | 西安交通大学 | 线阵光电传感器层析扫描三维测量方法及其装置 |
JP5034891B2 (ja) | 2007-11-21 | 2012-09-26 | 旭硝子株式会社 | 透明板状体の形状測定装置及び板ガラスの製造方法 |
JP2012021781A (ja) | 2010-07-12 | 2012-02-02 | Asahi Glass Co Ltd | 表面形状の評価方法および評価装置 |
-
2013
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0273140A (ja) * | 1988-05-13 | 1990-03-13 | Saint Gobain Vitrage | 板ガラスまたは板ガラス製品の光学的品質を決定する方法および該方法を実施する装置 |
JP2001502800A (ja) * | 1996-10-18 | 2001-02-27 | インノメス・ゲゼルシャフト・フュア・メステクニク・エム・ベー・ハー | 反射表面の経路を測定する方法及び装置 |
JP2010513925A (ja) * | 2006-12-19 | 2010-04-30 | ピルキングトン・ノースアメリカ・インコーポレイテッド | 車両用成形ガラスのひずみを反射された光学像により自動的に定量分析する方法 |
WO2011158869A1 (ja) * | 2010-06-15 | 2011-12-22 | 旭硝子株式会社 | 形状測定装置、形状測定方法、およびガラス板の製造方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112880600A (zh) * | 2021-04-29 | 2021-06-01 | 深圳博升光电科技有限公司 | 一种成像装置及检测玻璃的设备 |
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