JP2010230576A - Failure inspection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a failure inspection method discriminating existence of a failure of an inspection object with high sureness without enlarging a facility or increasing facility cost. <P>SOLUTION: In a primary discrimination process, existence of a failure of a plurality of inspection objects 1 is discriminated. In a marking process, an ink 2 for visualizing by receiving irradiation of light having a specific wavelength is applied onto an inspection object 1 discriminated to have a failure in the primary discrimination process. In a secondary discrimination process, light having a specific wavelength is irradiated toward the inspection object 1, while conveying the inspection object 1 passing through the primary discrimination process, and existence of a failure is discriminated again relative to the inspection object 1 on which the ink 2 is visualized by receiving irradiation of the light having the specific wavelength. In a reporting process, when discriminated that the inspection object 1 has a failure in the primary discrimination process, the discrimination result is reported before discriminating existence of a failure in the secondary discrimination process relative to the inspection object 1. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a defect inspection method for determining the presence or absence of a defect of an inspection object while conveying the inspection object.

  When various products are manufactured, a defect inspection is often performed on the products to determine the presence or absence of defects such as coating defects, chips, cracks, and dimensional abnormalities. Hereinafter, a product to be subjected to a defect inspection is referred to as an inspection object 1. For example, when various types of inspection objects 1 are painted, it is necessary to perform a coating state inspection to determine whether the coating state is good or bad. In particular, the flow coat for coating the inspection object 1 by passing the inspection object 1 through the paint 3 flowing down in the form of a curtain is advantageous in that it is highly effective in painting and can eliminate waste of the paint 3. Although it is a method, since the coating 3 which flows down may have a coating defect by the discontinuation 4 etc., it is important to inspect the coating state for quality control of a product.

  As a method for inspecting the coating state of the inspection object 1, for example, after irradiating the inspection object 1 after painting and imaging the reflected light with a camera, the quality of the coating state can be determined using an image processing technique. It has been proposed (see Patent Document 1).

  However, it is very difficult to set a threshold value for accurately detecting a coating failure. For this reason, a coating failure has been detected or a coating failure has occurred even though no coating failure has occurred. Nevertheless, there is a problem that poor coating is not detected. In particular, when coating is performed on the inspection object 1 having a concavo-convex shape, the intensity of the reflected light from the convex portion and the reflected light from the concave portion of the inspection target 1 is different. It is very difficult to accurately determine the quality using image processing technology.

  In addition, as shown in FIG. 4, it is also possible to determine whether the paint state is good or not based on the result of visual observation by human eyes without relying on automatic determination using image processing technology.

  In the example shown in FIG. 4, after the inspection object 1 conveyed by the belt conveyor 5 is applied by passing through the coating material 3 flowing down from the flow coater 6, the inspection object 1 after the coating is further applied. It is conveyed by the belt conveyor 5. A human inspector 15 stands by in the vicinity of the transport path of the inspection object 1 after painting. The inspector 15 visually observes the inspection object 1 after painting, and paints based on the result. Determine whether the condition is good or bad. At the time of inspection by the inspector 15, light is emitted from the illuminator 25 toward the inspection object 1, so that the inspector 15 can easily visually recognize the coating failure.

  However, since human concentration is limited, there is a high possibility that a defective coating state will be missed when a plurality of inspection objects 1 that are sequentially conveyed are observed visually for a long time.

  Further, as described above, since there is a limit to discriminating whether or not the paint state is good by only one stage of discrimination work, it is also performed to judge whether or not the paint state is good by two stages of discrimination work.

  For example, in the example shown in FIG. 5, the quality of the paint state is automatically determined using image processing technology in the primary discrimination process, and the quality of the paint state visually determined by human eyes is determined in the secondary discrimination process. Perform discrimination work. In the example shown in FIG. 5, the inspection object 1 is first applied to the coating material 3 flowing down from the flow coater 6 while the inspection object 1 is conveyed by the belt conveyor 5. Next, in the primary discrimination step, while the inspection object 1 is further conveyed, the inspection object 1 is irradiated with light from the illuminator 7 and the reflected light is imaged by the imaging device 8. Based on this captured image, the control panel 10 determines the quality of the paint state using an image processing technique. At this time, in order to prevent the coating failure from being detected even though the coating failure has occurred, the criterion for determination is set strictly. The inspection object 1 after imaging is sent to the rotating conveyor 26. The rotary conveyor 26 is configured to be driven to rotate up and down between a horizontal state and a downwardly inclined state with the upstream end portion as a fulcrum. When the rotating conveyor 26 is in the horizontal state, the inspection object 1 is transported to the secondary discrimination process, and when the rotating conveyor 26 is inclined downward, the inspection object 1 is used for loading good products. Transported to space. The up-and-down rotation of the rotating conveyor 26 is controlled by the control panel 10, and when no coating state failure is detected, the control panel 10 tilts the rotating conveyor 26 downward to bring the inspection object 1 into a non-defective product. To the loading space. On the other hand, when a defective coating state is detected, the control device places the rotating conveyor 26 in a horizontal state and sends the inspection object 1 to the secondary determination step. In the secondary discrimination step, the inspection object 1 is further conveyed by the belt conveyor 5. A human inspector 15 stands by in the vicinity of the transport path of the inspection object 1 in the secondary discrimination process, and the inspector 15 finally confirms whether the paint state is good or not based on the visual observation result. .

  When the two-stage discrimination operation is performed in this way, the quality of the coating state is determined by determining again whether the coating state is good or not in the secondary discrimination step for the inspection object 1 in which the coating state is determined to be defective in the primary discrimination step. The certainty of discrimination is increased.

  However, in the example shown in FIG. 5, it is necessary to distribute the inspection object 1 between the secondary determination process and the product loading space after the automatic determination of the quality of the coating state using the image processing technique. Equipment such as the rotating conveyor 26 must be provided, or both equipment for the secondary discrimination process and product loading space must be provided. For this reason, there is a problem that the equipment for coating state inspection is enlarged and a large space is required, and the equipment cost is increased.

  Moreover, in the example shown in FIG. 5, although the burden of the inspector 15 at the time of observing the inspection object 1 in a secondary discrimination | determination process is reduced, the inspector 15 is inspected object 1 conveyed irregularly. You have to observe without missing. For this purpose, the inspector 15 must exhibit a certain level of concentration even during the period in which the inspection object 1 is not being transported, but it is difficult for humans to maintain such concentration for a long time. If the inspection object 1 is transported when the concentration of the inspector 15 is interrupted, a coating defect may be overlooked. Even if the inspection object 1 is conveyed after the inspection object 1 has not been conveyed for a long time, the inspector 15 must immediately start the work of observing the entire surface of the inspection object 1 in a short time. However, since it is not easy to switch such an instantaneous action, it is difficult for the inspector 15 to carefully observe the entire surface of the inspection object 1 in such a case.

  Further, here, the case of the coating state inspection is given as an example, and the problem is shown. However, the same problem may occur in various defect inspections such as chipping, cracking, and dimensional abnormality other than the coating state inspection. .

JP-A-6-317540

  The present invention has been made in view of the above points, and provides a defect inspection method that can determine with high certainty whether there is a defect in an inspection object without incurring an increase in equipment size or equipment cost. The purpose is to provide.

  The defect inspection method according to the present invention is a defect inspection method for determining the presence or absence of defects of the inspection object 1 while sequentially conveying a plurality of inspection objects 1, and includes the following primary determination process, marking process, and notification process And a secondary discrimination step.

  In the primary discrimination step, the presence or absence of defects of the plurality of inspection objects 1 is discriminated. In the marking process, an ink 2 that is visualized by being irradiated with light of a specific wavelength is applied to the inspection object 1 that has been determined to be defective in the primary determination process. In the secondary discrimination step, the inspection object 1 that has undergone the primary discrimination step is conveyed while irradiating light of the specific wavelength toward the inspection target 1 and receiving the light of the specific wavelength. The inspection object 1 visualized by the ink 2 is determined again for the presence or absence of defects. In the notification step, when the inspection object 1 is determined to be defective in the primary determination step, the determination result is notified before the inspection target 1 is determined to be defective in the secondary determination step. To do.

  For this reason, in this invention, the presence or absence of a defect can be discriminate | determined by the two-stage structure of a primary discrimination | determination process and a secondary discrimination | determination process. Further, in the secondary determination step, it is only necessary to determine whether or not the inspection object 1 is defective only when notification by the notification means is made, and the frequency of determination work in the secondary determination step can be reduced. Further, in the secondary discrimination step, the ink 2 is visualized only in the inspection object 1 whose coating state has been judged to be poor in the primary discrimination step. Therefore, the presence / absence of the failure is discriminated based on the presence / absence of the visualization of the ink 2. The inspection object 1 to be checked can be easily specified. In addition, prior to the secondary discrimination process, it is not necessary to assign the inspection object 1 that has undergone the primary discrimination process to the inspection object 1 that has been determined to be defective and the inspection object 1 that has not been determined to be defective.

  In the present invention, in the primary discrimination step and the secondary discrimination step, whether or not the substrate is defective is determined in determining whether the substrate is defective. The inspection object 1 is obtained by flow coating. The inspection object 1 is painted, and in the primary discrimination step, the inspection object 1 is coated by detecting the presence or absence of a break 4 in the paint 3 flowing down toward the inspection object 1 before painting. It is preferable to determine whether the state is good or bad.

  In this case, before the inspection object 1 is coated, it is possible to determine whether the inspection object 1 is in a coated state. For this reason, compared with the case where the quality of the coating state is determined after the inspection object 1 is painted, the secondary determination step from the time when the coating state of the inspection object 1 is determined to be defective in the primary determination step. Therefore, it is possible to take a longer time until the quality of the coating state of the inspection object 1 is determined, and to provide a time margin for performing the notification in the notification step between the primary determination step and the secondary determination step. It can be secured sufficiently. Further, when the inspection object 1 has a concavo-convex shape, it is possible to accurately determine the quality of the coating state without being affected by the concavo-convex shape of the inspection object 1.

  Further, in the present invention, in the notification step, a specific timing based on a point in time when the inspection object 1 determined to be defective in the primary determination step in the secondary determination step is irradiated with light of the specific wavelength. It is preferable to make a notification at.

  In this case, in the secondary determination step, it is possible to always determine whether there is a defect in the inspection object 1 at the same timing with reference to the time point when the notification is made in the notification step. It becomes easier to determine whether there is a defect.

  Further, in the present invention, in the primary discrimination step, a position on the inspection object 1 that has been determined to be defective is derived, and in the marking step, the inspection that has been determined to be defective in the primary determination step. It is preferable to apply the ink 2 on the object 1 at a position corresponding to the position where the defect is detected.

  In this case, in the secondary discrimination process, based on the application position of the ink 2 on the inspection object 1, the position in the inspection object 1 where a defect is detected in the primary discrimination process can be specified. It becomes easier to determine whether the inspection object 1 is defective in the determination process.

  As described above, according to the present invention, the presence / absence of a defect is determined in a two-stage manner of a primary determination step and a secondary determination step, and an inspection object determined as defective in the primary determination step is determined in the secondary determination step. Since it is possible to easily identify and determine the presence or absence of defects again only for this inspection object, and further reduce the frequency of determination work in the secondary determination process, the presence or absence of defects in the inspection object can be reliably confirmed. It is possible to discriminate with the ability to reduce the burden required for the secondary discrimination process. Moreover, before the secondary discrimination process, there is no need to sort inspection objects that have passed the primary discrimination process into inspection objects that have been determined to be defective and inspection objects that have not been determined to be defective. Therefore, it is possible to prevent an increase in equipment size and an increase in equipment cost.

It is the schematic which shows an example of embodiment of this invention. (a) thru | or (d) is explanatory drawing which shows the image process for the detection of the coating defect in embodiment same as the above. It is a top view which shows an example of the test target object which is a coating target in embodiment same as the above. It is the schematic which shows an example of a prior art. It is the schematic which shows another example of a prior art.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to FIG.

  FIG. 1 shows a coating apparatus equipped with equipment for determining whether or not a coating state is good when determining whether or not an inspection object 1 is defective. The coating apparatus includes a transport unit, a coating unit, a primary determination unit, a marking unit, a secondary determination unit, and a notification unit provided along a transport path of the inspection object 1 by the transport unit.

  The conveying means is provided for conveying the inspection object 1 before painting and after painting. In the present embodiment, the conveying means is configured by the belt conveyor 5 that conveys the plate-shaped inspection object 1 in the horizontal direction, but other appropriate configurations may be employed depending on the form of the inspection object 1 and the coating method. You may provide the conveyance means to have.

  The coating means is provided for applying the coating 3 to the inspection object 1 and performing coating. The painting means in the present embodiment is a flow coater 6 that flows the paint 3 in a curtain shape toward the upper surface of the inspection object 1 conveyed by the conveying means, but the configuration of the painting means is limited to this. is not. In this embodiment, the inspection object 1 is coated by passing the inspection object 1 through the paint 3 that flows down in the curtain shape while being conveyed by the conveying means.

  The primary discriminating means is provided for discriminating the quality of the coating state of the inspection object 1. The primary discriminating means in the present embodiment has a function of automatically discriminating the quality of the coating state of the inspection object 1 using image processing technology, and is configured by an illuminator 7, an imaging device 8, and a control unit 9. However, the configuration of the primary discrimination means is not limited to this.

  The illuminator 7 in the primary discriminating means is disposed in the vicinity of the paint 3 flowing down from the flow coater 6 in the form of a curtain, and irradiates light toward the paint 3.

  The imaging device 8 in the primary discrimination means is also disposed in the vicinity of the paint 3 flowing down from the flow coater 6 and is disposed on the same side as the illuminator 7 with respect to the paint 3. When the light emitted from the illuminator 7 is reflected by the paint 3, the imaging device 8 receives the reflected light and images it. An example of the imaging device 8 includes a CCD camera that scans and images the flowing paint 3, but is not limited thereto.

  The control unit 9 in the primary discrimination means controls the illuminator 7 and the imaging device 8, and detects a paint defect by processing an image captured by the imaging device 8 using an image processing technique. Storage means such as a memory storing a program, arithmetic means such as an arithmetic circuit that operates based on the program, and the like are provided. The control part 9 in this embodiment is comprised with the control panel 10 provided with the said memory | storage means and a calculating means. The control panel 10 is provided with a notification lamp 11 controlled by the control unit 9. A specific example of processing for determining whether the coating state is good or not in the control unit 9 will be described later.

  The marking means is provided for applying the ink 2 that is visualized by being irradiated with light of a specific wavelength to the inspection object 1 whose coating state has been determined to be defective by the primary determination means. The marking means in the present embodiment is composed of a coating device 12 and a control unit 9.

  In the present embodiment, the coating device 12 in the marking means is disposed above the conveyance path of the inspection object 1 after painting, and the ink 2 is ejected toward the upper surface of the inspection object 1 by ejecting the ink 2. Apply to inspection object 1. The coating device 12 includes an electromagnetic valve 13, and the ejection of the ink 2 from the coating device 12 is controlled by the electromagnetic valve 13. The coating device 12 is fixed to the conveying means (belt conveyor 5) by a stand 14. As the ink 2, an ink 2 that is visualized by emitting fluorescence by receiving light of a specific wavelength is used. The specific wavelength is preferably a wavelength outside the visible region or a wavelength near the boundary between the visible region and the outside of the visible region. As such an ink 2, for example, a fluorescent ink 2 that emits fluorescence when irradiated with ultraviolet rays having a long wavelength emitted from a black light or the like is used. As such a fluorescent ink 2, an appropriate commercial product can be used, and an example thereof is trade name “Magicalmino Paint” manufactured by Shinroihi Co., Ltd.

  The control unit 9 in the marking unit operates based on the storage unit storing a program for controlling the coating apparatus 12 based on the determination result of the quality of the coating state of the inspection object 1 in the primary determination unit, or based on the program. Computation means and the like are provided. The control unit 9 includes, for example, a control panel 10 including the storage unit and the calculation unit. In the present embodiment, the control unit 9 in the primary discrimination unit also serves as the control unit 9 in the marking unit. A specific example of control of the coating apparatus 12 by the control unit 9 will be described later.

  The secondary discriminating means is provided for re-determining whether the paint state is good or not for the inspection object 1 whose paint state has been judged to be defective by the primary discriminating means. The secondary discrimination means is provided on the downstream side of the transport path of the inspection object 1 with respect to the position where the ink 2 is applied to the inspection object 1 by the marking means. The secondary discriminating means in the present embodiment is a working space for the human inspector 15 to visually observe the inspection object 1 conveyed by the conveying means. The secondary discrimination means is provided with an illuminator 16 that irradiates the inspection object 1 with light of a specific wavelength for visualizing the ink 2 above the conveyance path of the inspection object 1. . For example, when the fluorescent ink 2 that emits fluorescence when irradiated with ultraviolet rays having a long wavelength as described above is used as the ink 2, a black light or the like is provided as the illuminator 16.

  When the primary discrimination means determines that the coating state of the inspection object 1 is defective, the notifying means uses the primary determination means before the coating state is determined by the secondary determination means for the inspection object 1. It is provided to notify the determination result. In the present embodiment, the notification means includes an alarm device and a control unit 9.

  In this embodiment, a notification lamp 17 is provided as a notification device for performing notification by turning on. This notification lamp 17 is provided in the vicinity of the secondary discrimination means, and is arranged at a position where the inspector 15 who performs a visual inspection with the secondary discrimination means can visually recognize. In addition, a notification buzzer that performs notification using a notification sound may be provided as a notification device. In this case, a notification buzzer is provided at a position where the inspector 15 that performs visual inspection with the secondary discrimination means can perceive the notification sound. Further, a notification lamp 17 and a notification buzzer may be provided.

  Further, the control unit 9 in the notifying means stores a storing means for storing a program for controlling the notifying device based on the determination result of the coating state of the inspection object 1 in the primary determining means, and operates based on the program. Arithmetic means for performing the operation. The control unit 9 includes, for example, a control panel 10 including the storage unit and the calculation unit. In the present embodiment, the control unit 9 in the primary discrimination unit also serves as the control unit 9 in the notification unit. A specific example of alarm control by the control unit 9 will be described later.

  A method of coating the inspection object 1 and determining the coating state of the inspection object 1 using the coating apparatus configured as described above will be described.

  First, the coating material 3 is caused to flow down from the flow coater 6, and a plurality of inspection objects 1 before coating are sequentially supplied to the starting end of the conveying means, whereby the plurality of inspection objects 1 are sequentially conveyed by the conveying means. The inspection object 1 in the present embodiment is a ceramic roofing material as shown in FIG. When this exterior roofing material is installed on the roof, only the area on the front end side is exposed to the outside. For this reason, it is necessary to paint the area on the front end side. On the other hand, the area on the rear end side of the exterior roof material is overlaid with another exterior roof material, so that it is not exposed outdoors and does not require painting. Hereinafter, a region that requires painting, such as the region on the front end side of the inspection object 1, is referred to as a coating region 22, and a region that does not require painting, such as the region on the rear end side, is referred to as a non-coating region 23. In addition, the material, shape, application, etc. of the inspection object 1 are not limited to this embodiment.

  The inspection object 1 conveyed by the conveying means is first coated with the coating material 3 by passing through the coating material 3 flowing down from the flow coater 6, and the upper surface of the inspection object 1 is painted. At this time, the coating may be performed only on the coating region 22 of the inspection object 1. In the case where a break 4 occurs in the paint 3 flowing down from the flow coater 6 at the time of painting, painting failure occurs.

  At the time of painting, the quality of the coating state of the inspection object 1 is judged by the primary discrimination means (primary discrimination step). When the inspection object 1 includes the painted area 22 and the non-painted area 23 as in the present embodiment, it is only necessary to determine the quality of the painted state only for the painted area 22. In this primary determination step, a coating failure is detected based on the break 4 of the coating material 3 flowing down from the flow coater 6, and when a coating failure is detected, the coating state of the inspection object 1 is determined to be defective. In this primary discrimination step, light emitted from the illuminator 7 is first reflected by the paint 3 flowing down from the flow coater 6, and the reflected light is imaged by the imaging device 8. As shown in FIG. 2A and FIG. 2B, in the image 18 generated by the imaging device 8, the portion of the paint 3 where the discontinuity 4 is not generated becomes bright because the intensity of the reflected light is increased. Since the intensity of the reflected light is weakened at the portion where the discontinuity 4 of 3 is generated, it becomes dark. The image data generated by the imaging device 8 is sent to the control unit 9. The control unit 9 processes the image using an image processing technique and detects a coating failure. In processing the image, the control unit 9 performs a filtering process such as an averaging filter on the captured image to convert it into a grayscale image, and then uses the preset threshold as a reference, as shown in FIG. To a binarized image 19. The binarized image 19 is divided into appropriate segments 20 as shown in FIG. 2 (d), and the binarized data of each segment 20 is sequentially identified. The binarized data of each segment 20 and the segment The binarized data of other segments 20 adjacent around 20 are compared. Thereby, the presence / absence of a series of segments 20a having binarized data exceeding the threshold is detected, and the number of the connected segments 20a when the series is generated is detected. Then, when a predetermined number or more of the series 20 of segments 20a having binarized data exceeding the threshold value is detected in FIG. 2D, the control unit 9 causes the paint 3 to be interrupted 4 so as to cause a coating failure. It is determined that it has occurred, and paint failure is detected. In this case, the threshold value at the time of binarization processing and the predetermined number of consecutive segments 20 for determining the break 4 of the paint 3 are different from each other in spite of a paint failure occurring on the inspection object 1. An appropriate value is set so as not to be detected.

  When the primary discrimination means determines that the coating state of the inspection object 1 is defective, the control unit 9 may turn on the notification lamp 11 provided on the control panel 10 separately from the notification step described later. Good. In this case, it is possible to notify an operator or the like around the control panel 10 of the occurrence of coating failure.

  Next, the ink 2 is applied by the marking means to the inspection object 1 that has been painted and the painted state is determined to be defective (marking step).

  In this marking process, before the ink 2 is applied, the control unit 9 determines, based on the position where the discontinuity 4 of the paint 3 is determined on the image and the position of the inspection object 1 on the transport path during painting, A detection position 24 for coating failure on the inspection object 1 is derived. The position of the inspection object 1 on the conveyance path is, for example, the time when the inspection object 1 is supplied to the conveyance means, the time when the inspection object 1 passes a predetermined position on the conveyance path, and the conveyance of the inspection object 1 by the conveyance means The speed or the like is detected by an appropriate sensor or the like, and is determined based on the detection results.

  Next, the control unit 9 determines the application position of the ink 2 on the inspection object 1 based on the coating defect detection position 24 on the inspection object 1. A correspondence relationship between the detection position 24 of the coating failure and the application position of the ink 2 on the inspection object 1 is set in the control unit 9 in advance. The application position of the ink 2 may be any position on the inspection object 1 as long as the ink 2 is not visually recognized under irradiation with visible light. However, the inspection object such as the non-coating region 23 in the exterior roofing material may be used. When applied to a region that does not appear in appearance when using 1, even if the ink 2 is visible to some extent under visible light irradiation or not visible under visible light irradiation, it is accidentally irradiated with light of a specific wavelength at night. In such a case, the ink 2 can be prevented from being visually recognized.

  In the present embodiment, as shown in FIG. 3, the inspection object 1 is virtually divided into a plurality of pieces (in the horizontal direction when the arrangement direction of the coating region 22 and the non-coating region 23 is the vertical direction). In the embodiment, the paint area 22 and the non-paint area 23 are also virtually divided at the same time, and the divided paint area 22 (divided paint area 22a) adjacent in the vertical direction and the non-paint area divided. 23 (divided non-painting regions 23a) are associated with each other. Then, the divided non-coating region 23a corresponding to the divided coating region 22a where the coating defect detection position 24 exists is set as the ink 2 application position. In this case, since the application position of the ink 2 is in the vicinity of the coating defect detection position 24, the approximate position of the coating defect detection position 24 can be grasped based on the application position of the ink 2.

  Next, the inspection object 1 after painting is conveyed to the secondary discrimination means. In this secondary transport means, light of a specific wavelength is irradiated from the illuminator 7 toward the inspection object 1 that is sequentially transported, and an inspection in which ink 2 that is visualized by receiving the light of the specific wavelength is applied. The quality of the coating state of the object 1 is determined again (secondary determination step). The determination of the quality of the coating state in the present embodiment is performed by the inspector 15 observing the inspection object 1 with the naked eye, and the inspector 15 determining whether there is a coating defect based on the observation result. If the inspector 15 determines that the coating state of the inspection object 1 is defective, the inspector 15 can extract the inspection object 1 from the conveying means and discard it.

  In this secondary discrimination step, the inspector 15 observes the inspection object 1 that has been irradiated with light of a specific wavelength from the illuminator 16, thereby ink from a plurality of inspection objects 1 that are sequentially conveyed. The inspection object 1 to which 2 is applied (that is, the inspection object 1 whose coating state is determined to be defective in the primary determination step) can be easily specified. For this reason, the inspector 15 only needs to determine the quality of the coating state only for the specified inspection object 1, and the burden of the determination work is reduced. In addition, all the inspection objects 1 that have undergone the primary determination process can be transported to the secondary determination means, and the inspection object 1 whose coating state has been determined to be defective in the primary determination process is determined to be defective. There is no need to distribute the inspection object 1 that has not been performed, and there is no need to provide facilities and space for distribution.

  Further, if the application position of the ink 2 on the inspection object 1 is in the vicinity of the detection position 24 of the coating failure in the primary determination step as in the present embodiment, the inspector 15 applies the ink 2 application position on the inspection object 1. By confirming the above, it is possible to grasp the approximate position of the coating defect detection position 24, and the certainty of determining whether the coating state is good or not increases. In addition, in order to be able to grasp the coating defect detection position 24 based on the ink 2 applied to the inspection object 1, the application position of the ink 2 and the coating defect detection position 24 are matched in the marking process. The ink 2 may be applied in various sizes and shapes corresponding to the detection positions 24 for poor coating.

  In addition to the series of processes described above, after the coating state of the inspection object 1 is determined to be defective in the primary determination process, before the coating state of the inspection object 1 is determined in the secondary determination process. Then, the determination result is notified by the notification means (notification step).

  In this notification step, the control unit 9 operates the notification device (notification lamp 17) after determining the poor coating state of the inspection object 1 in the primary determination step. Thereby, it is possible to alert the inspector 15 waiting in the secondary discrimination means that the inspection object 1 whose coating state is determined to be defective in the primary discrimination process is conveyed. In addition, the quality of the coating state of the inspection object 1 in the secondary discrimination process is further easily discriminated.

  Further, when the control unit 9 operates the alarm, the inspection object 1 whose coating state is determined to be defective in the primary determination step is irradiated with light of a specific wavelength from the illuminator 7 provided in the secondary determination unit. It is preferable that the notification is performed by operating the alarm at a specific timing before this time point with respect to the time point of receiving. In this case, after the notification by the notification means, the inspector 15 can always perform the work of determining the quality of the coating state of the inspection object 1 at the same timing, and the coating state of the inspection object 1 in the secondary determination process. It becomes easier to determine whether or not the product is good.

  As described above, one embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and as long as the requirements of the present invention are satisfied, the details of the invention including the matters mentioned in the above description are included. Various changes corresponding to the conversion are possible.

  For example, in the above-described embodiment, the quality of the coating state is determined based on the imaging result of the paint 3 flowing down from the flow coater 6 in the primary determination step, but the coating of the inspection object 1 after the application is performed. You may determine the quality of a coating state based on the imaging result of a film | membrane.

  However, as in the above-described embodiment, determining whether the coating state is good or not based on the imaging result of the paint 3 flowing down from the flow coater 6 is that the inspection object 1 is coated before the inspection object 1 is coated. This is advantageous in that the quality of the paint state can be determined. In this case, a longer time is required from the time when the coating state of the inspection object 1 is determined to be defective in the primary determination process until the determination of the quality of the coating state for the inspection object 1 is performed in the secondary determination process. It is possible to ensure a sufficient time margin for performing the notification in the notification step between the primary determination step and the secondary determination step. Further, when the inspection object 1 has a concavo-convex shape, it is possible to accurately determine the quality of the coating state without being affected by the concavo-convex shape of the inspection object 1.

  Further, in the above-described embodiment, the quality of the coating state is automatically determined using the image processing technique in the primary determination step, and the quality of the coating state is determined by human visual inspection in the secondary determination step. However, the method for determining whether the paint state is good or not is not limited to this. For example, in the secondary determination step, the coating film on the inspection object 1 is imaged instead of the determination of the quality of the coating state visually observed by humans, or together with the determination of the quality of the coating state visually observed by humans. However, the quality of the paint state may be automatically determined by the same image processing technique as in the primary determination step. In this case, the threshold value at the time of binarization processing at the time of image processing of the imaging result and the predetermined number of consecutive segments 20 for detecting a coating defect in the binarized image are different from the case of the primary determination step. It is preferable to set an appropriate value so that a coating failure is not detected even though a coating failure does not occur in the inspection object 1.

  Moreover, although the embodiment in the case where the coating state inspection of the inspection object 1 is particularly performed is shown here, the present invention is not limited to the coating state inspection, but includes various cracks, cracks, dimensional abnormalities, etc. for the various inspection objects 1. It can be applied to various defect inspections. That is, for example, while conveying a plurality of various inspection objects 1, it is determined whether there is a defect such as chipping, cracking, dimensional abnormality or the like by automatic determination using image processing technology in the primary determination process, and inspection is performed in the primary determination process. When a defect of the object 1 is determined, the ink 2 is applied to the inspection object 1 in the marking process, the determination result is notified in the notification process, and the defect 1 is determined in the primary determination process. Whether or not there is a defect can be determined by human visual inspection or the like.

1 Inspection object 2 Ink 3 Paint 4 Discontinuity

Claims (4)

A defect inspection method for determining the presence or absence of defects of an inspection object while sequentially conveying a plurality of inspection objects, comprising the following primary determination process, marking process, secondary determination process, and notification process And defect inspection method;
In the primary determination step, the presence or absence of defects in the plurality of inspection objects is determined,
In the marking step, the inspection object determined to be defective in the primary determination step is applied with an ink that is visualized by irradiation with light of a specific wavelength,
In the secondary discrimination step, the inspection object that has passed the primary discrimination step is irradiated with light of the specific wavelength toward the inspection target, and the ink is received by receiving the light of the specific wavelength. Re-examine the presence or absence of defects in the inspection object being visualized,
In the notification step, when the inspection object is determined to be defective in the primary determination step, the determination result is notified before the inspection object is determined to be defective in the secondary determination step.   In the primary discrimination step and the secondary discrimination step, whether the substrate is defective or not is determined in determining whether the substrate is defective, and the inspection target is subjected to coating by flow coating. In the primary discrimination step, the quality of the coating state of the inspection object is determined by detecting whether or not the paint flowing down toward the inspection object before coating is interrupted. Item 2. The defect inspection method according to Item 1.   In the notification step, notification is performed at a specific timing based on a time point when the inspection object that has been determined to be defective in the primary determination step in the secondary determination step is irradiated with light of the specific wavelength. The defect inspection method according to claim 1 or 2.   In the primary determination step, a position where a defect on the inspection object determined as defective is detected, and in the marking step, the defect on the inspection object determined as defective in the primary determination step is detected. The defect inspection method according to claim 1, wherein the ink is applied to a position corresponding to the detected position.

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