KR101351809B1 - X-ray inspection system and method for plate-shaped device - Google Patents

Abstract

The present invention relates to an X-ray inspection system, for a plate-shaped inspection target, capable of efficiently and accurately determining whether engagement of parts in a plate-shaped mobile device such as a tablet PC is failure or not, and including an X-ray generation unit for irradiating a plate-shaped inspection target with X-ray beam; a detector for detecting the X-ray beam transmitted through the inspection target; and a failure determination unit for implementing a detection signal from the detector into an inspection target image, limiting one or more inspection region from the inspection target and determining assembly failure of an inspection target by comparing a reference gray scale value with a gray scale value at an inspection location within the inspection region. Therefore, the rapid and accurate detection of failure in a manufacturing process of products is possible.

Description

X-ray inspection system and method for plate-like specimens {X-RAY INSPECTION SYSTEM AND METHOD FOR PLATE-SHAPED DEVICE}

The present invention relates to an X-ray inspection system, and more particularly, to an X-ray inspection system and inspection method of the plate-like inspection object that can efficiently and accurately determine whether the fastening of the components in the plate-like mobile device, such as a tablet PC. .

In general, the X-ray projected value for X-ray inspection is for measuring the circuit mounting state of an inspection object such as various circuit boards in a non-destructive state, and uses characteristics of the difference in transmittance of X-rays.

Patent No. 10-280747 (hereinafter referred to as prior art) is disclosed as a conventional X-ray inspection apparatus.

This prior art is a visible image of a mounting table on which an inspection object is mounted, an X-ray irradiator positioned above the mounting table for irradiating X-rays to the inspection object, and an X-ray image positioned below the mounting table and transmitted through the inspection object. It includes an image acquisition unit for converting to, and detects the transmittance of the X-rays to the object to be determined to determine whether or not the proper arrangement and combination of the circuit through a predetermined image.

The X-ray inspection apparatus is mainly used to determine the proper formation of the circuit or the suitability of the molding of the parts, etc., which is provided in the necessary elements in a predetermined production facility that goes through a series of processing steps, and the accuracy of the production or joining of each part It is to judge the quality of the back.

By the way, the conventional X-ray inspection apparatus is to determine whether or not the defect in a way to image the corresponding parts and compare with a predetermined reference image, there was a problem that can not be applied to one finished product.

In the case of the finished product, even if each part is properly processed or molded, problems may occur in the coupling relationship. Especially, problems such as detachment of screws that fasten the parts to each other may be solved by conventional inspection devices. Virtually none.

In particular, in the case of a plate-like mobile device, such as a tablet PC has a high degree of integration, it is very difficult to determine a defect in the bonding process because the coupling portions between the members are close to each other.

The present invention has been made to solve the above problems, in particular, in the mobile device of the plate-like device, such as tablet PC in the last step of the systemized process of each part clearly determine the appropriateness of fastening of each component and whether the fastening member is separated The purpose of the present invention is to provide an X-ray inspection system and inspection method for plate-like specimens.

The X-ray inspection system of the plate-like inspection object of the present invention includes an X-ray generation unit for irradiating an X-ray beam to a plate-like inspection object, a detector for detecting an X-ray beam passing through the inspection object, and a detection signal from the detector as an inspection object image. Implement but limit the one or more inspection region in the inspection object image, and compares the gray scale value of the reference grayscale value and the inspection position in the inspection area to determine the assembly of the inspection object including a defective judgment portion X-ray inspection system is provided. Therefore, it is possible to detect a defective product quickly and accurately in the production process of the product.

In addition, the X-ray inspection system of the plate-like object of the present invention is a plurality of divided areas including the space in which the flow of the member can occur in the vertical direction within the range of the display area of the planar inspection object image. Can be done. Therefore, since the inspection is performed only within a specific range on the plane, the reference grayscale value can be set, and accurate defect determination is possible.

In addition, the X-ray inspection system of the plate-like inspection object of the present invention, it is preferable that the inspection area is set so as to correspond to a portion where a plurality of batteries in a plane is arranged in the plate-like inspection object. Therefore, an efficient inspection position can be set.

In addition, the X-ray inspection system of the plate-like inspection object of the present invention, an image realizing unit for implementing the inspection object image that the defective determination unit is the entire image of the inspection object, and divides and defines two or more inspection areas in the inspection object image. And an installment unit and a judging unit for comparing the reference grayscale value in the inspection region with the grayscale value in the individual inspection positions in the inspection region to determine whether or not it is defective. Therefore, it is possible to set and determine an accurate inspection area in the overall planar image.

In addition, as the inspection method by the inspection system, detecting and implementing the entire image of the inspection object, defining and dividing two or more inspection areas, and the reference gray scale value for the inspection area and the inspection position in the inspection area It provides a method for X-ray inspection of the plate-like inspection object comprising the step of detecting the defective area by comparing the grayscale value of the. Therefore, it is possible to efficiently and quickly determine the failure of the product.

In the X-ray inspection method of the plate-like inspection object of the present invention, the step of detecting the defective area is to set the reference grayscale value to the average grayscale value (Gm) for the inspection area, and to the reference grayscale value If the gray scale value Gn of the inspection position is small, it can be determined as defective. Thus, the reference grayscale value can be set appropriately for the product and the inspection position.

In another embodiment, the step of detecting the defective area may set the reference grayscale value to a range of an upper limit value G2 and a lower limit value G1 of a normal grayscale for a particular inspected object, and an inspection position. If the grayscale value Gn of the out of the range of the normal grayscale value can be determined as bad. Therefore, it is possible to flexibly respond to various environments.

In the X-ray inspection system and method of the plate-like inspection object according to the concept of the present invention, the inspection area is divided into only the inspection area with a high probability of defects such as the flow of the fastening member or the inflow of foreign substances into the inspection area. Compared with the reference grayscale value, the scale value provides a concept to determine the defect, so it has the effect of overcoming the limitation that was conventionally determined by visually using X-ray fluoroscopy and enabling accurate and quick product inspection. .

In addition, it is possible to set various inspection areas and set the standard gray scale value, so that it is possible to adapt to the finished products of various devices, and to immediately determine whether the fastening or the like is good even in the middle of the production process. The efficiency of the effect is maximized.

1 is a conceptual diagram of an X-ray inspection system of the plate-like test object according to the present invention.
2 is a view showing an image of the test object in the X-ray inspection system of the plate-like test object according to the present invention.
3 is a view showing a matching image set by the control unit in the X-ray inspection system of the plate-like object of interest according to the present invention.
Figure 4 is a flow chart showing the X-ray inspection method of the plate-like test object according to the concept of the present invention.
5 is a flowchart illustrating an embodiment of a defective area detection step of FIG. 4.
6 is a flowchart illustrating another embodiment of the defective area detection step of FIG. 4.

Hereinafter, with reference to the accompanying drawings will be described in more detail the X-ray inspection system and method of the plate-like inspection object according to the present invention.

1 is a conceptual diagram showing an X-ray inspection system of the plate-like object of the present invention.

The present invention basically provides an X-ray generator 130 for irradiating an X-ray beam to an inspected object 20, a detector 140 for detecting an X-ray beam transmitted through the inspected object 20, and the detector 140. Implement the detection signal from the inspection object image 200, limit and divide the inspection area to be inspected in the inspection object image 200, and set the gray scale value in each inspection area and gray in the inspection position. An X-ray inspection system of a plate-like inspection object including a defect determination unit for comparing a scale value and detecting a defective area is provided.

The inspected object 20 mainly describes an example of a tablet PC in the concept of the present invention, but includes an inspected object which is various plate-shaped devices. Here, the plate-shaped test object is not necessarily limited to the thin device only in the height direction, if the device having a wide horizontal and vertical width in the overall height direction is understood to include various devices such as mobile phones, e-books or tablets It should be understood that even if it is not a finished product, it is also to be understood to include a device for inspecting defects in the assembled state between the parts in the middle of the production process.

Here, the defect of the product is understood to include not only the defect of the fastening state by the detachment of the fastening member, but also the concept of all the defects caused by the inflow of foreign matter or foreign substances caused by the crack of the member.

The X-ray generator 130 may selectively use a device, such as a closed type high voltage X-ray generator or an open type X-ray generator, when the X-ray generator 130 is capable of irradiating X-rays to the inspected object 20. In addition, a variety of equipment capable of generating electromagnetic waves of various wavelengths capable of measuring the structure of a material using radio waves may be selected.

The detector 140 is a device that can detect the X-ray beam transmitted or scattered through the inspected object 20. In FIG. 1, the X-ray generator 130 is disposed inside the housing 110 and the detector 140 is disposed above. ) Is shown below the inspection object 20, but is not necessarily limited to the arrangement shown.

The housing 110 may be formed of a material and a shape capable of accommodating the X-ray generator 130 and the detector 140 in an interior space and preventing leakage of the X-ray beam to the outside. It is not necessary to isolate the object, and in some cases, the object to be inspected 20 is automatically formed by allowing the withdrawal and withdrawal of the object 20 into the housing 110 by the transfer means 120 in a predetermined process line. Preferably, the inspection can be carried out while being transported. However, of course, the housing 110 may be omitted.

The detector 140 detects an X-ray beam that passes through or scatters the object 20 and converts the detected X-ray beam into a detection signal, and sends the detected signal to the defective determination unit 150. The defective determination unit performs predetermined data processing as will be described later. Through this function to detect a defective area of the image implemented from the detection signal.

In detail, the defective determination unit 150 divides the image implementation unit 151 for implementing the image of the inspection object 20 and the inspection object by dividing the image of the inspection object into a plurality of inspection regions and restricts a range to specify an inspection object. The division unit 152 may include a determination unit 153 which compares the gray scale set in each divided area with the gray scale of the inspection position in the inspection area to determine whether there is a defect.

Here, it should be noted that the image implemented by the image implementation unit 151 does not necessarily mean implementation of an image on a predetermined display device. That is, the implementation may mean a collection state of data in a state where processing of predetermined values in a predetermined information processing process is possible. In the concept of the present invention, an X-ray perspective image of a predetermined inspection object is determined from a predetermined set of data. In comparison, the present invention provides an inspection system that determines that a difference between gray scale values is out of a set value or range, and does not necessarily determine whether a defect is visually. However, the processing result or the process may be visually implemented, and the display device may be included in the X-ray inspection apparatus of the plate-shaped mobile device of the present invention.

As described later, the plurality of inspection areas divided by the dividing unit 152 mean a limited area divided from one image of the entire inspected object. When the gray scale value is determined, other areas are excluded from the inspection object. it means. Therefore, such an inspection area may be set to a position where defects such as bolts at the time of fastening may remain, more specifically, such inspection areas may be set differently according to the inspection object 20. have.

When the inspection region is set in the image of the entire inspection object 20, the defective determination unit 150 sets a reference grayscale value in the inspection region and compares it with the gray scale value of a specific inspection position in the inspection region. The determination unit 153 compares the predetermined set grayscale to the set or calculated grayscale value at a predetermined inspection position and determines that the defect is out of the corresponding range.

2 is a view showing an image of the test object implemented in the X-ray inspection system of the plate-shaped test object of the present invention.

The inspection object image 200 refers to a state in which the detection signal of the inspection object 20 detected by the X-ray generation unit 130 and the detector 140 is processed by the defective determination unit 150. In the following description, the tablet PC is basically described as an example, but it should be noted that the division of each part may be made differently according to various equipment.

The inspection object image 200 is largely divided into defects through the comparison of the outer region 210 showing the overall border on the plane, the inspection region 220 divided by the dividing unit 152, and the gray scale value as described above. It may be divided into a defective area 240 of the inspection position to be determined.

In the description of the present invention, the outer region 210 has an example of a substantially rectangular shape having rounded corners. Inside the outer area 210, a display area 211 corresponding to a display on which a visual image of the test object 20 is implemented, and a substrate area 230 corresponding to an area where a PCB substrate is mainly disposed are disposed. Can be. The area of the region corresponding to each of the inspected object 20 may be represented by different grayscale values.

The inspection area 220 is divided into areas according to a predetermined criterion set by the dividing unit 152. Preferably, the inspection area 220 may be divided into two or more areas. In the drawing, the first inspection area 221 and the second area may be divided. An example consisting of the inspection area 222 is shown.

The inspection area 220 refers to a region of interest (ROI), that is, an area of interest image, not an entire image.

In a preferred embodiment, the inspection area 220 is preferably formed in a portion where a battery is disposed and a predetermined space may be formed above or below the space inside the battery. The embodiment of the present invention provides an example in which a battery is disposed at both sides of the bottom of the display and a flow space of a predetermined fastening member is provided at the battery portion. In this case, the inspection area 220 may be set by specifying an area of the battery part.

For example, as the casing, display, battery, and substrate of the inspected object 20 are processed and assembled, respectively, the fastening members such as bolts and nuts may not flow properly while being formed into finished products. In this case, especially in the case of a tablet PC or a smart phone, the members are densely arranged in the inner space adjacent to the outer periphery of the casing, but there is a possibility that a predetermined space is formed at the bottom of the display. Recently, since the display occupies most of the overall planar shape, bulky members such as batteries are disposed at the bottom of the display, and defective elements such as fastening members can flow along the space. However, the setting of the inspection area 220 by the space is not necessarily limited to the battery part at the rear of the display, and may be variously set according to the space due to factors such as the design and the tolerance of the product.

In the example of FIG. 2, the inspection region 220 includes a predetermined symmetrical first inspection region 221 and a second inspection region 222 which are formed on both sides of the inspection region 220 overlapping the planar display region 211. Divided.

However, in order to appropriately divide the inspection area 220, the division part 152 needs to provide a predetermined reference point. Preferably, the division standard is a predetermined matching image in the division part 152. Can be provided.

3 is a diagram illustrating the above-described matching image.

The matching image 300 is used to properly set the reference position of the inspection object image 200 in the dividing unit 152, which is a variety of shapes that are conveyed into the inspection apparatus of the product in the inspection line of a specific product. Function to respond.

That is, the matching image 300 is provided with a reference area 310 corresponding to the outside of the predetermined object 20, the reference area 310 is in the outer region 210 of the test object image 200. Can correspond. That is, the inspection object image 200 may be formed at various angles according to the shape to be transferred to the inspection apparatus. The inspection object image 200 may be divided after matching to an appropriate shape through the reference region 310.

However, it should be noted that the reference region 310 is not necessarily limited to the outer region 210 of the inspection object image 200 and may be determined by points or lines at various positions.

As described above, after the preparation of the predetermined division by the matching image 300 is completed, the inspection region 220 may be set through the matching inspection region 320. However, the matching inspection region may be set. The 320 and the inspection area 220 may be one concept. That is, when the inspection object image 200, which is an image of the inspection object 20, is implemented, the division unit 152 sets a reference through the matching image 300, and a specific target of the inspection may be set with respect to the preset inspection area. It can be.

4 is a flowchart illustrating a test method by an X-ray inspection system of a plate-like test object.

According to the concept of the present invention, a method of inspecting a plate-like object, basically, detecting and implementing a test object image 200 which is a whole image of the test object (S200), and the test object image 200 Dividing the plurality of inspection regions 220 (S200), and comparing the gray scale values set for each inspection region 220 to extract the defective regions 240 to detect the defective regions (S500). It can be made, including.

As described above, the detection and implementation of the object image 200 detects a detection signal from the detector 140 that emits the X-ray beam from the X-ray generator 130 to see the object 20 or detects scattered light. The defective determination unit 150 may be input by processing the same.

The inspection object image 200 is mainly composed of the outer region 210 and the inspection region 220 divided by the dividing unit 152, and the outer region 210 is a predetermined matching image as described above. The reference position of the division is provided.

The inspection area 220 may be formed by defining and dividing an area for comparing and determining grayscale values as described above. In the case of a tablet PC, the inspection area 220 is mainly a battery at the bottom of the display area 211. It can be concentrated on the placement site as described above. In addition, the inspection area 220 may be mainly formed in such a manner that an area on the inner circumferential side of the display area 211 is appropriately divided.

The setting of specific grayscale values will be described in more detail with reference to FIGS. 5 and 6.

Here, the failure determination unit 150 may be implemented through a predetermined algorithm in a predetermined control unit or a microcomputer of the inspection apparatus, and setting the predetermined matching image (S110) before the entire image detection step (S200). It may further include. The matching image 300 set here may be formed as a reference region 310 corresponding to the outer region 210 of the inspected object image 200 as described above, and the inspected image being disposed at various positions and angles ( It provides a criterion for dividing 200) accurately.

Therefore, after the step S200 of detecting and implementing the test object image 200 according to the above-described concept, a matching step S300 of the outer image is performed. The inspection area 220 may be divided (S400).

FIG. 5 is a flow chart showing an embodiment of detecting a defective area in the inspection method of the plate-like object of the present invention, and FIG. 6 is a flow chart showing another embodiment.

As described above, the determination unit 153 of the defective determination unit 150 sets a predetermined reference grayscale value in advance, and sets the grayscale value of the individual inspection position in the inspection area 220 to the set grayscale value. By comparison, poor judgment can be made.

Here, in the case where it is assumed that the grayscale value is made lower as the actual image is darkened, referring to FIG. 2, it can be seen that the inspection area 220 has a relatively larger grayscale value than the substrate area 230. When the separation of the fastening member such as a bolt or a nut occurs and flows in a portion of the inspection region 220, the portion may have a low gray scale value. However, it should be noted that the setting of the numerical value for the darkness of the grayscale value may be variously made according to an algorithm or an apparatus, and the case where the numerical value is set differently is included in the scope of the present invention.

Different embodiments may be applied according to the case of calculating the reference grayscale value. In the exemplary embodiment of FIG. 5, when the division of the inspection area S400 is completed, an average grayscale value for each inspection area 220 is obtained. The reference grayscale value may be set through Gm. That is, in each inspection area 220, for example, when a flow of debris or inflow of debris occurs at a specific position, the grayscale value of the corresponding area is generally lower than the average of the grayscale values of the entire area, and thus The grayscale value may be calculated as an average of grayscale values of the inspection area 220. Here, the reference grayscale values of the respective inspection areas 221 and 222 may be separately set, or the average grayscale value of the entire inspection area 220 may be set as the reference grayscale value.

When the setting of the reference grayscale value is completed as described above, the comparison (S520) of the grayscale value Gn for each predetermined position may be performed for each inspection area 220, and the grayscale value Gn of the inspection position is performed. ) Is determined to be less than the reference grayscale value (Gm) (S530) can be determined as bad (S540), and if the grayscale value (Gn) of the inspection position is larger than the reference grayscale value (Gm) The position is determined to be good, and the comparison (S520) and the determination (S530) of gray scale values with respect to another inspection position may be performed.

In FIG. 6, an example in which the reference grayscale value is set in another manner is illustrated. When the inspection area 220 is set according to a design specification of a predetermined product, a range of normal grayscale values of the corresponding region may be predetermined. .

Therefore, the upper limit G2 and the lower limit G1 of the normal grayscale value are set in advance (S550), and a concept that can be determined to be defective when out of the range G1 to G2 of the reference grayscale value is provided. This range of normal grayscale values can be applied in various ways depending on the product specifications and inspection equipment.

Therefore, when setting of the ranges G1 to G2 of the reference grayscale values is completed as described above, the comparison (S560) of the grayscale values Gn may be performed for each of the inspection areas 220 at predetermined positions. If it is determined in S570 that the grayscale value Gn of the inspection position is out of the range G1 to G2 of the reference grayscale value, it may be determined as defective (S580), and the grayscale value Gn of the inspection position is If it is larger than the range G1 to G2 (Gm) of the reference grayscale value, the corresponding position may be determined to be good, and comparison of the grayscale value with respect to another inspection position (S520) and determination (S530) may be performed.

In FIG. 6, an example in which the reference grayscale value is set in another manner is illustrated. When the inspection area 220 is set according to a design specification of a predetermined product, a range of normal grayscale values of the corresponding region may be predetermined. .

In this case, the determination process S570 may basically be performed to determine that the case where the grayscale value Gn is smaller than the lower limit G1 is bad (S580), as in the case of the exemplary embodiment, and is gray than the upper limit G2. The case where the scale value Gn is large may be determined as defective (S580). In addition, as shown in the drawing, when the grayscale value Gn is smaller than the lower limit G1 or larger than the upper limit G2, that is, outside the range of the normal grayscale value G1 to G2. Of course, all of them may be determined to be defective (S580).

In the X-ray inspection system and method of the plate-like inspection object according to the concept of the present invention as described above, the inspection area is divided into only the inspection area with a high probability of defects, such as the flow of the fastening member or the inflow of foreign matter. In this regard, the gray scale value is compared with the reference gray scale value to provide a concept for determining defects. Therefore, the limitation of the defects that were conventionally determined through visual X-ray perspective images is overcome. It has a possible advantage. That is, in the case of a device such as a tablet PC in which various members are densely arranged, setting of the reference grayscale value is virtually impossible, whereas in the present invention, the inspection area is mainly limited to a predetermined area below the display area. It is possible to determine whether each inspection position is defective according to the setting of the reference value.

In addition, it is possible to set various inspection areas and set the standard gray scale value, so that it is possible to adapt to the finished products of various devices, and to immediately determine whether the fastening or the like is good even in the middle of the production process. The efficiency of can be maximized.

In the foregoing, the present invention has been described in detail based on the embodiments and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the content of the following claims.

20 Test object 110 Housing
120 Transport means 130 X-ray generator
140 ... 200 detector ...
210 Outside area 211 Display area
220 Inspection Area 221 Inspection Area 1
222 2nd inspection area 230 ... substrate area
300 ... matching image 310 ... reference area
320 ... Matching inspection area 321 ... First matching inspection area
322 second matching inspection area

Claims (7)

An X-ray generator that radiates an X-ray beam to a plate-shaped test object;
A detector for detecting the X-ray beam that has passed through the inspected object; And
And a defect determination unit that implements a detection signal from the detector as an inspection object image, divides and defines an inspection area in the inspection object image, and determines an assembly failure of the inspection object.
The defective determination portion,
A matching image is provided in advance, the matching image including a reference area for matching the inspection object image and setting a reference for division and a matching inspection area for setting the inspection area,
Matching the reference area corresponding to the shape and position of the inspection object image to be transported, if a division standard is provided, the inspection area is divided and defined for the area where the flow of the fastening member or the inflow of foreign matter is high. An x-ray inspection system for a plate-like inspection object, characterized in that the defect is determined by comparing the reference grayscale value preset for each inspection area with the grayscale value of the individual inspection position. The method of claim 1,
And the inspection area comprises a plurality of divided areas including a space in which a member flow can occur in a vertical direction within a display area of a planar inspection object image. 3. The method of claim 2,
The inspection area, X-ray inspection system of the plate-shaped inspection object, characterized in that is set to correspond to the site where a plurality of batteries in the planar inspection object is arranged. The method of claim 1,
The defective determination portion,
An image realizing unit for implementing an inspection object image, which is a whole image of the inspection object, a partitioning unit for dividing and defining two or more inspection areas in the inspection object image, a reference grayscale value in the inspection area, and an individual inspection in the inspection area And a judging unit for comparing the gray scale value at the position to determine whether the defect is defective. An inspection method by the X-ray inspection system of the plate-like inspection object of any one of claims 1 to 4,
Detecting and implementing a full image of the object under test;
Defining and dividing two or more inspection areas; And
And comparing the reference grayscale value for the inspection region with the grayscale value at the inspection position in the inspection region, and detecting a defective region. The method of claim 5,
Detecting the defective area,
The reference grayscale value is set to an average grayscale value Gm for the inspection area, and when the grayscale value Gn of the inspection position is small with respect to the reference grayscale value, it is judged as defective. X-ray inspection of objects. The method of claim 5,
Detecting the defective area,
The reference grayscale value is set within the range of the upper limit value G2 and the lower limit value G1 of the normal grayscale for the type of inspected object, and the grayscale value Gn of the inspection position is a range of the normal grayscale value. X-ray inspection method of the plate-like inspection object, characterized in that it is determined that the defect is a deviation.

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