WO2011055432A1 - ワーク検査装置 - Google Patents
ワーク検査装置 Download PDFInfo
- Publication number
- WO2011055432A1 WO2011055432A1 PCT/JP2009/068842 JP2009068842W WO2011055432A1 WO 2011055432 A1 WO2011055432 A1 WO 2011055432A1 JP 2009068842 W JP2009068842 W JP 2009068842W WO 2011055432 A1 WO2011055432 A1 WO 2011055432A1
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- Prior art keywords
- light
- inspection
- illumination
- gap
- reflecting
- Prior art date
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- 238000007689 inspection Methods 0.000 title claims abstract description 146
- 238000005286 illumination Methods 0.000 claims abstract description 86
- 238000003384 imaging method Methods 0.000 claims description 50
- 230000003287 optical effect Effects 0.000 claims description 21
- 239000011888 foil Substances 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract 3
- 230000003760 hair shine Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 17
- 230000002950 deficient Effects 0.000 description 13
- 239000002184 metal Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical class 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000001093 holography Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- 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
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/003—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements
- G07D7/0032—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements using holograms
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
- G07D7/128—Viewing devices
Definitions
- the present invention relates to an inspection apparatus for inspecting a sheet-like workpiece having a gloss such as a metal foil, and particularly to an inspection apparatus that can be suitably used for inspection of a workpiece with a hologram attached thereto.
- the hologram for proving the authenticity is a hologram in which a predetermined design is displayed by the holographic effect depending on the incident angle of the predetermined illumination light, the angle of the line of sight, or the like.
- holograms have been attached to book covers and packaging boxes for the purpose of enhancing not only the authenticity but also the decorativeness.
- the hologram for enhancing the decorativeness in this way is different from the hologram for demonstrating that it is genuine, and the luxury of the appearance is important. Even if the incident angle of illumination light and the angle of line of sight are the same, the same Many designs do not display holography.
- an internal light source is disposed so as to face the surface to be inspected over the width direction of the workpiece, and a reflection that reflects light from the internal light source.
- a workpiece inspection apparatus provided with a mirror and provided with a photographing means for photographing a surface to be inspected through a photographing gap formed in the reflecting mirror (for example, see Patent Document 1).
- the reflecting mirror has a cross-sectional shape viewed from the side of the conveyance path and lacks a portion of an ellipse.
- a straight line connecting the first focal point and the second focal point is inclined forward or backward with respect to a normal line at the first focal point of the surface to be inspected of the workpiece, and the internal light source is all Light is emitted in the direction, a part of the emitted light is irradiated toward the first focal point on the surface to be inspected of the workpiece, and the other emitted light is reflected by the reflecting mirror and irradiated toward the first focal point. ing.
- the photographing means captures specularly reflected light of direct radiation directed from the internal light source toward the first focus, and can also capture irregularly reflected light reflected by the reflecting mirror. Based on the photographed image, This is to detect defective parts such as chipping and ink skipping.
- the workpiece inspection apparatus described in Patent Document 1 includes an internal light source that irradiates light in almost all directions inside a reflecting mirror having an elliptical cross-section when viewed from the side of the conveyance path, thereby allowing direct light from the light source. And the reflected light from the reflecting mirror can illuminate the inspection area with a good balance. Therefore, a light source capable of omnidirectional illumination such as a fluorescent lamp or a halogen lamp is used as the internal light source.
- a light source capable of omnidirectional illumination such as a fluorescent lamp or a halogen lamp
- the inspection process for the area other than the hologram and the inspection process for the hologram area are inspected separately as in the prior art, a plurality of inspection processes are required, and the inspection speed (efficiency) decreases.
- the inspection speed efficiency decreases.
- even for books, packaging boxes, and the like that are provided with holograms for improving decorativeness, inspection speed and inspection accuracy comparable to those of printed materials that do not have holograms are required.
- an object of the present invention is to provide a workpiece inspection apparatus capable of inspecting a workpiece with a metal foil such as a hologram with high accuracy and high speed.
- the present invention is provided so as to cover the inspection region, and reflects the light on the inner surface facing the inspection region, and is disposed outside the reflection member and transmits through the wall of the reflection member, or the Illuminating means for illuminating illumination light inside the reflecting member through the gap between the reflecting members, and imaging means arranged outside the reflecting member and imaging the inspection region through the gap between the reflecting members,
- a workpiece inspection apparatus is configured that irradiates the inspection region with light from multiple directions incident by an illumination unit and reflected by the inner surface of the reflecting member, and images the inspection region with the imaging unit.
- the positional relationship between the illumination unit and the incident gap of the reflection member is set so that the output light of the illumination unit does not enter the inspection region before being reflected by the inner surface of the reflection member. What is set is preferable (claim 2).
- the inner surface of the reflecting member is formed of a concave curved surface having no corners or a combination of a concave curved surface and a flat surface except for the gap and the end on the inspection area side (Claim 3).
- a light diffusing member for diffusing the output light between the illuminating means and the gap for entering the illumination light of the illuminating means, or within the gap (claim 4).
- the illumination unit is arranged so that illumination light is incident on the inner side of the reflecting member through the same gap as the gap for imaging the inspection area by the imaging unit (Claim 5).
- a half mirror that reflects the output light from the illumination unit and guides it to the gap on the optical axis of the imaging unit.
- the wall of the reflecting member itself is made of a light transmissive diffuser, and the output light of the illuminating means is transmitted through the wall and incident on the inside of the reflecting member (Claim 7).
- the inspection region is irradiated with light from multiple directions reflected by the inner surface of the reflecting member.
- illumination means such as LEDs that are difficult to illuminate in all directions
- the amount of light inside the reflecting member is made uniform due to the reflection of light on the surface of the workpiece, and high-precision inspection is possible.
- the present invention is not only useful for inspection of the hologram area, but can also perform inspection with high accuracy even for inspection outside the hologram area. That is, the inspection of the hologram area and the outside of the hologram area can be simultaneously performed with high accuracy.
- the holographic effect on the hologram surface can be reduced, even if the angle of the optical axis with respect to the normal line of the inspection region changes, there is little change in the brightness of the hologram surface, and the installation position of the imaging means is There is also an advantage that the degree of freedom in design is improved in that it is not limited. Furthermore, even if the type of hologram is different, there is little change in the brightness and darkness of the hologram surface due to changes in the angle of the optical axis with respect to the normal of the inspection area, and the inspection accuracy is hardly affected. Therefore, it is possible to inspect various holograms efficiently.
- the positional relationship between the illumination unit and the incident gap of the reflection member is set so that the output light of the illumination unit does not enter the inspection region before being reflected by the inner surface of the reflection member, The influence of the light quantity change at the corner of the gap is prevented from occurring on the work surface, and the uniformity of the light quantity is maintained.
- the inner surface of the reflecting member is a concave curved surface with no corners except for the gap and the end on the inspection area side, or a combination of the concave curved surface and a flat surface, so that the amount of light becomes non-uniform due to the corners. And the uniformity of the amount of light is maintained.
- the inspection area is formed with a more uniform amount of light. Illumination is possible from all directions, the holographic effect is further reduced, and the uniformity of the amount of light is maintained.
- the illumination unit is arranged so that the illumination light is incident on the inner side of the reflecting member through the same gap as the gap for imaging the inspection area by the imaging unit, the light is not reflected by the imaging gap. The change of the light quantity by this is prevented, and the uniformity of the light quantity of light is maintained.
- the position of the illumination unit is separated from the position of the imaging unit and does not interfere with the imaging. Can be set to any position.
- the reflecting member wall itself is made of a light-transmitting light-diffusing member, and the output light of the illumination means is transmitted through the wall and incident on the inside of the reflecting member, so that light is incident through the gap.
- the position of the illumination means can be set relatively freely, and the degree of freedom in design is improved.
- the side sectional view of the work inspection device concerning a typical embodiment.
- the front view of the workpiece inspection apparatus shown in FIG. (A) is a hologram image illuminated with two fluorescent lamps
- (b) is a hologram image using a workpiece inspection apparatus.
- FIG. 1 is a cross-sectional view of a workpiece inspection apparatus according to a representative embodiment of the present invention.
- the workpiece inspection apparatus 1 illuminates a workpiece 3 conveyed on the conveyance path 2 with an illuminating device, and images an inspection area of the illuminated workpiece 3 with an imaging unit 5.
- a circular dome-like reflecting member 7 extending in the workpiece width direction orthogonal to the conveying direction of the conveying path 2 is provided so as to cover the inspection region 3a, and a slit-like shape extending in the workpiece width direction of the reflecting member 7 on the outside thereof.
- a plurality of illumination means 6a, 6b, 6c are provided at a plurality of positions through the gaps 8a, 8b, 9 so that illumination light is incident on the inside of the reflection member 7 from a plurality of directions when viewed from the side of the conveyance path.
- An imaging unit 5 that images the inspection region 3 a through a slit-like gap (gap 9) extending in the workpiece width direction of the reflecting member 7 is provided outside the reflector 7.
- the reflection member 7 is a member having an inner surface facing the inspection region 3a as a reflection surface 7a, and the inspection region 3a is reflected by light from multiple directions incident from the outer illumination means 6a, 6b, 6c and reflected by the reflection surface 7a. Is irradiated with a uniform amount of light, and this is imaged by the imaging means 5. With such a configuration, even when an LED or the like is used as the illumination means 6, it is possible to irradiate the inspection region 3a with a uniform amount of light, and therefore, the holographic effect of the hologram can be reduced and high-precision inspection can be performed. It can be done.
- the work 3 is a sheet of paper or continuous paper with ink printing or hologram attached thereto.
- the work 3 is continuously conveyed on the conveyance path 2 and an image of the surface to be inspected is captured by the imaging means 5. Is done.
- a sheet with a hologram attached as the work 3 will be described.
- it may be a continuous sheet other than a sheet, and may be made of synthetic resin, metal, It may be wooden.
- it is not limited to what the hologram adheres, The metal foil without a holography effect may adhere, and the printed matter of only the ink which a hologram and metal foil do not adhere may be sufficient. .
- the workpiece 3 conveyed on the flat conveyance path 2 may be imaged, or the workpiece 3 conveyed on the trunk may be imaged.
- the imaging means 5 is a CCD camera, a line sensor, or the like, and images the inspection area 3 a of the work 3.
- the image signal continuously picked up by the image pickup means 5 is output to an inspection control device (not shown) to inspect the work 3.
- a plurality of imaging means 5 are arranged in the workpiece width direction orthogonal to the conveyance direction of the conveyance path 2 to image the inspection surface of the workpiece 3. It may be provided only.
- the illumination means 6 is an illumination device using LEDs (light emitting diodes).
- the light from the illumination means 6a and 6b is incident on the reflection member 7 through the illumination gaps 8a and 8b on the side walls of the reflection member 7, respectively.
- Light from the illuminating means 6 c enters the reflecting member 7 through the imaging gap 9.
- these illumination means 6 are arranged in the width direction to output light with a substantially uniform light amount in the width direction.
- the illumination unit 6a and the illumination unit 6a and the light amount incident from the gap 8a on the front side (downstream side) in the transport direction and the light amount incident from the gap 8b on the rear side (upstream side) in the transport direction are substantially the same.
- the output light from the illumination unit 6b is controlled to irradiate the inspection region 3a with uniform light from all directions.
- the illumination means 6 is comprised from the light source of white LED which outputs white light in this example, you may include light sources, such as infrared LED which outputs infrared light, and ultraviolet LED which outputs ultraviolet light. .
- light sources such as infrared LED which outputs infrared light
- ultraviolet LED which outputs ultraviolet light.
- the LED is not limited to an LED, but may be a fluorescent lamp, a halogen lamp, or the like. Since it has a longer life than a lamp and there is little change in the amount of light depending on the usage time, it is preferable in that the amount of time for adjusting the amount of light of each illumination means 6 can be reduced.
- a light diffusing member 10 for diffusing the output light from the illuminating means 6 is provided, respectively.
- the light diffusing member 10 may be provided corresponding to each illuminating means 6, but as shown in FIG. 1, one light diffusing member 10b outputs light from the illuminating means 6b and the illuminating means 6c. Each may be scattered.
- the position of “between” the lighting unit and each gap described as the position where the light diffusing member 10 is provided is “between” the position where the lighting unit is provided and the position where each gap is provided.
- the light output from the illumination means is directed to the half mirror 11 and reflected to reach the imaging gap 9 as in the example of FIG. Any position in the middle of light traveling from to the gap is included in the “between” positions.
- the light diffusing member 10 is provided between the illumination means 6 and the gap 8, but the light diffusing member 10 may be provided in the gap 8 or in the reflecting member 7.
- the light diffusing member 10 is preferably made of paper such as tracing paper, or made of synthetic resin or glass obtained by applying ink or polishing the surface of a transparent plate member.
- the illumination means 6 itself has a light-diffusing property as in a fluorescent lamp
- the light-diffusing member 10 may be omitted.
- the light-diffusing member 10 is provided to further diffuse the output light from the fluorescent lamp to reflect the reflecting member 7. May be incident.
- the reflection surface 7a on the inner side of the reflection member 7 is configured to be white by applying white ink or by forming the reflection member 7 itself from a white material, and the light incident from each gap is reflected by the reflection surface 7a.
- the work 3 in the inspection area 3a is illuminated by the reflected light.
- the reflective surface 7a is matted to improve the light diffusion performance.
- the internal space of the reflecting member 7 has a cross-sectional shape substantially lacking a part of a cylinder, and is arranged so that its axis is substantially parallel to the width direction. That is, the reflection surface 7a on the inner surface is a concave curved surface having no corners except for the gaps 8a, 8b, and 9.
- the shape of the internal space may be a shape other than the shape lacking a part of the cylinder.
- the gap inner end surface forming the illumination gap 8 is configured in white like the reflection surface 7 a, and the output light from the illumination means 6 is reflected by the inner surface and can enter the reflection member 7.
- the imaging gap 9 is a gap for the imaging means 5 to image the inspection region 3a, and is provided at a position where the wall surface of the reflecting member 7 and the optical axis 5a of the imaging means 5 intersect.
- the inner end face forming the imaging gap 9 is configured in white like the reflecting surface 7a.
- Output light from the illumination means 6 enters the reflecting member 7 from the imaging gap 9.
- the reflected light from the half mirror 11 is applied to the inspection region 3 a through the imaging gap 9.
- the light may be incident on the imaging gap 9 without using the half mirror 11.
- the half mirror 11 is provided on the optical axis 5 a of the imaging unit 5, transmits a part of the light from the inspection region, reflects the output light from the illumination unit 6 c, and performs imaging. Is incident on the gap 9.
- the test area 3a can be irradiated with substantially uniform light from all directions.
- the imaging means 5 and the half mirror 11 are arranged so that the optical axis 5a of the imaging means 5 has a predetermined angle with respect to the normal line of the inspection region 3a. This prevents regular reflection light of light incident from the illumination unit 6 c via the half mirror 11 from entering the image capturing unit 5.
- the imaging unit 5 and the half mirror 11 may be arranged so that the optical axis 5a of the imaging unit 5 coincides with the normal line of the inspection region 3a.
- the light beams 14a and 14b that have passed through the illumination gaps 8a and 8b do not directly enter the inspection region 3a before being reflected by the reflecting surface 7a on the inner surface of the reflecting member 7 (directly illuminate the inspection region 3a).
- the reflecting surface 7a on the inner surface of the reflecting member 7 is irradiated.
- light is incident on the optical axis 13a of the light beam 14a upward with respect to the transport direction.
- the upward tilt angle with respect to the transport direction of the optical axis 13a from the front side in the transport direction and the upward tilt angle with respect to the transport direction of the optical axis 13b from the rear in the transport direction are substantially the same angle.
- FIGS. 1 and 2 The hologram image of (Condition 2) is compared.
- 3A is a hologram image when illuminated with two fluorescent lamps (condition 1)
- FIG. 3B is a hologram image when illuminated with the workpiece inspection apparatus 1 of the present invention (condition 2).
- Table 1 shown below is a level value of R (Red) G (Green) B (Blue) of a captured image at measurement points a to k in FIG. 3
- Table 2 is a difference value of RGB at positions adjacent to Table 1 It is.
- FIG. 4 is a graph of the difference values in Table 2.
- the level value has 256 levels from 0 to 255.
- the maximum level value of R in condition 1 is “222”, the minimum level value is “106”, and the level value difference is “116”.
- the maximum level value of G is “223”, the minimum level value is “111”, and the level value difference is “112”.
- the maximum level value of B is “211”, the minimum level value is “139”, and the level value difference is “72”.
- the maximum level value of R in condition 2 is “150”, the minimum level value is “135”, and the level value difference is “15”.
- the maximum level value of G is “160”, the minimum level value is “146”, and the level value difference is “14”.
- the maximum level value of B is “156”
- the minimum level value is “151”
- the level value difference is “5”.
- the difference value 16 (16R, 16G, 16B) in the condition 2 has a smaller numerical value width than the difference value 15 (15R, 15G, 15B) in the condition 1. That is, an image obtained by illuminating a hologram with the workpiece inspection apparatus 1 of the present invention has little color change due to a difference in measurement position, and can reduce the holographic effect of the hologram.
- the directivity of the light irradiating the inspection area 3a is not uniform in normal illumination, only a different image can be obtained for each work even at the same location due to the diffraction effect on the hologram surface.
- a workpiece that should originally be determined as a non-defective product is also determined as a defective product.
- the inspection accuracy of the hologram area is lowered, it is determined that the hologram area is a non-defective product even if there is a defective portion such as a scratch, a chip, or an ink jump in the hologram area.
- the work inspection apparatus 1 of the present invention With the work inspection apparatus 1 of the present invention, the diffraction effect on the hologram surface can be reduced, and the inspection accuracy of the hologram area can be increased.
- the workpiece inspection apparatus 1 of the present invention has a uniform direction of the illuminating light even with respect to a metal foil having no hologram effect, so that there is no unevenness of reflected light at the metal foil portion and inspection with high inspection accuracy is possible.
- the present invention is not limited to the work 3 provided with a hologram or a metal foil, but can be used as an inspection apparatus for printed matter only with ink.
- the imaging means 5 must be installed at an angle at which the hologram surface can be seen brightly, and there is a disadvantage that the installation position of the imaging means 5 is limited. Furthermore, since the angle at which the hologram surface looks bright differs depending on the type of hologram, there is a disadvantage that the position where the imaging means 5 is installed must be changed for each type of hologram.
- the diffraction effect on the hologram surface can be reduced, and even if the angle of the optical axis 5a with respect to the normal line of the inspection region 3a changes, there is little change in brightness on the hologram surface.
- the installation position of the means 5 is not limited. Furthermore, even if the type of hologram is different, there is little change in the brightness and darkness of the hologram surface due to a change in the angle of the optical axis 5a with respect to the normal line of the inspection region 3a, and the inspection accuracy is hardly affected. There is no need to change the installation position. Furthermore, if it is the workpiece
- the blank 17 of the packaging box has a hologram 19 and a character 20 printed thereon. Further, the blank 17 is creased 18 when punched out by a wooden frame. The crease 18 is depressed by the blank 17 being pressed by a wooden frame.
- the inspection speed of such a blank 17 varies depending on the product, but is about 300 to 1200 per minute. In other words, the blank 17 is not positioned and imaged, but the blank 17 being continuously conveyed without being positioned is imaged, and the captured image is compared with the master image by the inspection control device to determine pass / fail. Accordingly, the hologram area and the outside of the hologram area can be inspected simultaneously, and the inspection time can be shortened.
- the inspection area 3a is illuminated and imaged with light having a biased directionality, so that it is impossible to image the same portion of the blank 17 under the same illumination conditions. . Accordingly, in the captured image, the hologram 19 has a different color for each blank, and most blanks are defective based on the color difference of the hologram area. If the inspection accuracy of the hologram area is lowered, scratches or dust generated on the hologram 19 cannot be detected, so that there is a high possibility that a defective product is mixed into a non-defective product.
- the workpiece inspection apparatus 1 illuminates and inspects the inspection region 3a with uniform light from all directions, so that it occurs in the hologram 19 without affecting the holographic effect as shown in FIGS. It is possible to detect a defective portion such as a scratch or dust with high accuracy. Furthermore, since the inspection area 3a is illuminated with uniform light from all directions, a change in the amount of light in the fold 18 of the blank 17 can be prevented, and the inspection accuracy of the fold 18 can also be improved.
- FIG. 6 shows another embodiment of the workpiece inspection apparatus 1 of the present invention.
- the internal space of the reflection member 7 has a shape substantially lacking a part of a cylinder, the axis of which is formed substantially parallel to the width direction, and the cross-sectional shape is a shape lacking a part of a circle.
- the mirrors 21a are extended at both front and rear ends.
- the outer surface is covered with light-diffusing members 10 a and 10 b so as to close the front and rear gaps 8 a and 8 b, and is configured integrally with the reflecting member 7.
- the output light output from the illumination means 6a located in the front and rear of the reflection member 7 toward the rear and lower in the transport direction is reflected obliquely upward by the mirror 21a and scattered by the light diffusing member 10a.
- the light enters the reflection member 7 through the illumination gap 8a.
- the output light output from the illumination means 6b positioned rearward in the transport direction with respect to the reflecting member 7 toward the front obliquely downward in the transport direction is reflected obliquely upward by the mirror 21b and scattered by the light diffusing member 10b.
- the light enters the reflecting member 7 through the illumination gap 8b.
- the workpiece inspection apparatus 1 shown in FIG. 6 is also a preferable example in that the inspection area 3a can be illuminated with substantially uniform light from all directions as shown in FIG.
- FIG. 7 shows still another embodiment according to the present invention.
- the shape of the internal space of the reflecting member 7 is semicircular, and the reflecting surface 7a is white.
- Illuminating means 6 a is provided in front of the reflecting member 7, and illuminating means 6 b is provided in the rear, and diffused members 10 a and 10 b are provided between the reflecting member 7 and the reflecting member 7, respectively.
- an illuminating means 6c for irradiating light toward the half mirror 11 provided above the reflecting member 7 is provided above the illuminating means 6b, and the light diffusing member 10b is provided between the illuminating means 6c and the half mirror 11. The upper part of is inserted.
- the light diffusing member 10b of the illumination means 6b and 6c is integrally configured as a common member. Then, the output light from the illuminating means 6a and 6b scattered by the light diffusing members 10a and 10b is applied to the reflecting surface 7a of the reflecting member 7 through the illumination gaps 8a and 8b, and the reflected light from the reflecting surface 7a is used.
- the inspection region 3a can be illuminated with substantially uniform light from all directions. In the example of FIG. 6 or FIG.
- the image pickup means 5 is arranged so that the optical axis 5a substantially coincides with the normal line of the inspection area 3a, but the optical axis 5a of the image pickup means 5 and the method of the inspection area 3a are arranged. You may arrange
- FIG. 8 shows still another embodiment according to the present invention, in which the wall of the reflecting member 7 itself is composed of a light-transmitting light-diffusing member, and the output light of a plurality of illumination means 6d arranged outside is shown in the figure.
- the light passes through the wall and enters the inside of the reflecting member 7. That is, the reflecting member 7 has a function as a light diffusing member.
- the reflecting member 7 is made of paper such as tracing paper, or made of synthetic resin or glass in which ink is applied to a transparent plate member or surface polishing is performed.
- the illumination means 6d is a fluorescent lamp in this example, but may be an LED as shown in FIG.
- the reflective member 7 is provided with a gap 9 for imaging.
- the output light from the illuminating means 6c is scattered by the light diffusing member 10c, and the scattered light is reflected by the half mirror 11 and enters the reflecting member 7 through the gap 9 for imaging to illuminate the inspection region 3a.
- the imaging means 5 images the inspection region 3a through the imaging gap 9.
- FIG. 9 shows still another embodiment according to the present invention, in which the reflecting surface 7a is a composite surface combining the concave curved surface 71 and the flat surface 70, and the size of the internal space inside the reflecting surface 7a is shown. More compact than the other embodiments described above. By such compactification, the amount of light incident on the inside is repeatedly reflected on the reflecting surface 7a and the work surface to illuminate the inspection region 3a (the optical path length is shortened, internal scattering is large, and the density of the amount of light is large). Since the uniformity is maintained, the holographic effect of the hologram can be reduced and high-precision inspection can be performed even if the illumination means 6b is only in one direction.
- the light beam 14b having passed through the illumination gap 8b is applied to the reflecting surface 7a so that the inspection area 3a is not directly illuminated, and light is incident on the optical axis 13a upward in the transport direction. Yes. Therefore, it is possible to prevent the change in the light amount due to the corner portion of the gap 8b from affecting the work surface, and to maintain the uniformity of the light amount.
- there is no light diffusing member and a uniform and sufficient amount of light can be obtained with only the illumination 6b from one direction viewed from the side of the conveyance path, and high-accuracy inspection can be performed. It is a possible structure.
- the inner surface of the reflecting member 7 is configured as a reflecting surface except for the gap 8, but the present invention is not limited to this, and a non-reflecting portion may be provided by providing a black curtain in part. .
- a non-reflecting portion By providing such a non-reflective portion, it becomes possible to inspect the shape when the workpiece provided with the hologram has an uneven shape such as emboss. Further, by providing illumination means that directly irradiates the inspection area through the gap, the uneven shape may be similarly inspected.
- Such a non-reflective portion is preferably configured to be able to switch between a function as a reflective surface and a function as a non-reflective surface by providing a black screen detachably.
- the holographic effect of the inspection area can be surely reduced with the black curtain removed first, and the state of printing or the like can be inspected with high accuracy, and then the uneven shape of the same inspection area can be inspected with the black curtain.
- the same inspection can be performed by switching on / off the direct illuminating means.
Abstract
Description
2 搬送路
3 ワーク
3a 検査領域
5 撮像手段
5a 光軸
6a,6b,6c 照明手段
7 反射部材
7a 反射面
8,8a,8b 隙間
9 隙間
10 散光部材
11 ハーフミラー
13a,13b 光軸
14a,14b 光束
15 差分値
16 差分値
17 ブランク
18 折り目
19 ホログラム
20 文字
21 ミラー
70 平坦面
71 凹曲面
Claims (7)
- 検査領域を覆うように設けられ、該検査領域に臨む内面で光を反射する反射部材と、
該反射部材の外側に配置され、該反射部材の壁を透過して、又は該反射部材の隙間を通じて、該反射部材の内側に照明光を入射する照明手段と、
前記反射部材の外側に配置され、該反射部材の隙間を通じて、前記検査領域を撮像する撮像手段とを備え、
前記照明手段により入射され、且つ前記反射部材の内面で反射された多方向からの光により前記検査領域を照射し、該検査領域を前記撮像手段で撮像するワーク検査装置。 - 前記照明手段、及び前記反射部材の入射用の隙間の位置関係を、該照明手段の出力光が前記反射部材の内面で反射される前に前記検査領域に入射することがないように設定した請求項1記載のワーク検査装置。
- 前記反射部材の内面が、前記隙間及び検査領域側の端部を除いて、角部のない凹曲面、又は凹曲面と平坦面の組み合わせよりなる請求項1又は2記載のワーク検査装置。
- 前記照明手段と該照明手段の照明光を入射するための前記隙間との間、又は該隙間内に、当該出力光を散光する散光部材を設けた請求項1~3の何れか1項に記載のワーク検査装置。
- 前記照明手段を、前記撮像手段により検査領域を撮像するための前記隙間と同じ隙間を通じて、反射部材の内側に照明光を入射するように配置した請求項1~4の何れか1項に記載のワーク検査装置。
- 前記撮像手段の光軸上に、前記照明手段からの出力光を反射して前記隙間に導くハーフミラーを配置してなる請求項5記載のワーク検査装置。
- 前記反射部材の壁自体を光透過性の散光部材で構成し、前記照明手段の出力光を該壁を透過させて反射部材の内側に入射してなる請求項1~6の何れか1項に記載のワーク検査装置。
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PCT/JP2009/068842 WO2011055432A1 (ja) | 2009-11-04 | 2009-11-04 | ワーク検査装置 |
CN2009801623276A CN102597751A (zh) | 2009-11-04 | 2009-11-04 | 制品检查装置 |
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Cited By (5)
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EP2433799A1 (en) * | 2010-09-22 | 2012-03-28 | Komori Corporation | Printing quality inspection apparatus |
JP2012068080A (ja) * | 2010-09-22 | 2012-04-05 | Komori Corp | 印刷品質検査装置 |
DE102012101310C5 (de) * | 2012-02-17 | 2014-09-04 | Stephan Krebs | Vorrichtung und Verfahren zur Druckbildkontrolle |
DE102014116947A1 (de) * | 2014-11-19 | 2016-05-19 | Bundesdruckerei Gmbh | Dokumentprüfgerät zum Überprüfen eines Dokuments |
EP4195173A1 (en) * | 2021-12-09 | 2023-06-14 | TPL Vision UK Ltd | Uv lighting device |
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DE102016109803B3 (de) * | 2016-05-27 | 2017-07-06 | Eyec Gmbh | Inspektionsvorrichtung und Inspektionsverfahren zur Inspektion des Oberflächenbildes einer einen Prüfling darstellenden Flachsache |
CN107817251A (zh) * | 2017-11-23 | 2018-03-20 | 苏州艺力鼎丰智能技术有限公司 | 一种碳纤维汽车零部件表面印刷物缺陷智能检测设备 |
CN109426971A (zh) * | 2018-09-13 | 2019-03-05 | 海南亚元防伪技术研究所(普通合伙) | 超限墨点防伪方法及印刷物 |
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Also Published As
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JP5755144B2 (ja) | 2015-07-29 |
JPWO2011055432A1 (ja) | 2013-03-21 |
CN102597751A (zh) | 2012-07-18 |
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