JP4994738B2 - Mounting component inspection equipment - Google Patents

Description

  The present invention relates to a mounting component inspection apparatus for inspecting a component mounted on a printed circuit board, and more particularly to a mounting component inspection apparatus for visually inspecting a surface-mounted component on a monitor.

The mounting substrate is printed with solder paste on the substrate, and then a mounting component is mounted on a predetermined portion by a mounter, and then mounted through a reflow process. After the mounting process is completed, an inspection is performed as to whether correct parts are mounted and the orientation is correct. Since the circuit formed on the board is frequently subjected to partial changes, constant changes of parts, etc., this inspection process is an important process. Conventionally, the document (assembly drawing / part list) and the actual product are imaged with a camera. A method of comparing the image with the enlarged image and visually checking the image has been widely adopted.
On the other hand, a device for comparing and inspecting a correctly mounted standard substrate and an inspection substrate has been proposed. For example, the inspection apparatus disclosed in Patent Document 1 uses two cameras, images a standard substrate with one camera, images the inspection substrate with the other camera, and displays both captured images in different colors. By using them and displaying them on a color monitor, if different parts are mounted on the standard board and the inspection board, it will be displayed in a different color from the surroundings so that defects can be found. .

JP-A-7-286966

However, in the conventional inspection method for comparing the document with the substrate, the mounting components are inspected while comparing the actual one-to-one with the documents, so that the work for the recent high-density mounting substrate only takes a lot of work. In addition, oversight and inspection mistakes were likely to occur, and the burden on the workers was heavy.
Further, the method of comparing with the non-defective substrate (standard substrate) of Patent Document 1 can be inspected relatively easily as compared with the method of comparing with the documents, but the standard substrate must always be prepared. Since the image is displayed with a single color shading, it is difficult to find a defect if the shape and arrangement are the same even if different parts are mounted.

  Therefore, in view of such a problem, the present invention can simplify the inspection of the mounted parts by computer-controlling the camera, reduce the burden on the operator, and improve the working accuracy of finding defects. An object is to provide a component inspection apparatus.

In order to solve the above-mentioned problem, the mounting component inspection apparatus according to the invention of claim 1 is a component information storage means for storing component information such as a position of a component to be inspected on a mounting substrate, a management code number, a product number, and a symbol symbol. And an image input means comprising a camera for picking up a mounted component and its control circuit, a monitor for outputting a camera-captured image in color, a first recording means for storing a picked-up image of a specific board, and a mounted component to be inspected and component selection means for selecting, a determination input means for inputting a test result, the image output control means for camera image output control to the monitor superimposed and images stored in the image: a first recording means captured, Cascade An output amount changing unit for emphasizing and outputting any one of the output images, and the output control unit picks up the part selected by the operation of the part selection unit Image input means to Together to image output to the monitor and control, the image of the selected part of the same parts of the image being recorded in the first recording means, and characterized in that bounded out to overlap the same image output unit of the monitor.
With this configuration, a non-defective image is stored and the non-defective image is displayed in accordance with the output of the inspection image, so that it is not necessary to search for a comparison part and the burden on the operator can be reduced. Since fractionating out color overlapping both images, to easily comparison test, it is possible to increase the accuracy of determining the quality. Further, once the non-defective substrate data is acquired, this data is stored, so that it is not necessary to store the non-defective substrate thereafter.
Furthermore, since a comparison image can be displayed on the same site and any one can be emphasized, it is easy to find differences. In addition, since the movement of the viewpoint can be minimized, operator fatigue can be reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, the related information display means for displaying the component information of the corresponding mounted component stored in the component information storage means on the monitor in accordance with the output component image. It is characterized by having.
With this configuration, the component information is displayed together, so it can be confirmed in detail whether the correct component is mounted.

According to a third aspect of the present invention, in the invention according to the first or second aspect, when the inspection of each part is continuously performed, a sorting means for sorting the inspection order so that the parts having the same zoom amount are continued is provided. Features.
With this configuration, the zoom time can be minimized and the entire image output operation time can be shortened. As a result, the loss time during the operation of the apparatus is reduced.

According to a fourth aspect of the present invention, in the first aspect of the invention, the second recording unit stores the part image of the board to be inspected, and the image output control unit stores the plurality of stored part images under inspection. It is characterized in that the part image of the same part stored in the first recording means is also displayed together with the image output on the monitor.
With this configuration, a plurality of parts can be inspected at the same time, and the work high interest rate can be increased.

  According to the present invention, since the non-defective image is stored and the non-defective image is displayed in accordance with the output of the inspection image, it is not necessary to search for a comparison part and the burden on the operator can be reduced. Since both the images are overlapped or adjacent to each other and the color is output, it is easy to carry out a comparative inspection, and it is possible to improve pass / fail judgment accuracy. Further, once the non-defective substrate data is acquired, this data is stored, so that it is not necessary to store the non-defective substrate thereafter.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an example of a mounting component inspection apparatus according to the present invention. Reference numeral 1 denotes a camera that includes a CCD image pickup element and a zoom lens and images a target object with a color image. XY actuator to be installed, 4 is a camera control circuit for controlling zoom and focus of the camera, 5 is an A / D converter, 6 is a video image input board for taking a video image into the personal computer 10, and 7 is an X- A serial port for connecting the Y actuator 2, 8 is a monitor such as a liquid crystal display for displaying captured images of the camera 1 and predetermined information, a video image power board 6, an A / D conversion circuit 5, and a serial port 7 are personal computers. (Hereinafter simply referred to as a personal computer) 10. Reference numeral 11 denotes a CPU of the personal computer 10; 12a, a recording memory for storing captured images; 12b, a component memory as component information storage means for storing component information such as the position of the inspection component, management code number, product number, symbol symbol, and the like. Show.

  The CPU 11 as the image output control means of the personal computer 10 controls the XY actuator 2 from the serial port 7 through the RS232C cable 13. When the camera control circuit 4 inputs a voltage value corresponding to the zoom / focus position of the camera 1 to the CPU 11 via the A / D converter 5, a relay built in the camera control circuit 4 receives this information. To adjust the zoom / focus of the camera 1. In this way, the surface mount component of the mounting board 3 is imaged from the camera 1 under the control of the personal computer 10, and the image is taken into the personal computer 10 through the coaxial cable 15 and the video image input board 6 and displayed on the liquid crystal monitor 8.

  Next, the operation of this apparatus will be described. First, the mounted component image of the non-defective board is stored in the recording memory 12a as the first recording means by a predetermined operation on the personal computer 10. At this time, the zoom amount is adjusted in accordance with the size of the component, and this operation is performed for each preset mounted component, and all non-defective images of the component to be inspected are stored. In this storage, the zoom data is also stored together with the captured image of the camera 1, and when the mounted component to be inspected is imaged, the imaging is performed under the same conditions such as the zoom amount.

Next, the mounting board to be inspected is similarly set on the XY actuator, and imaging of the component is started. Of the mounting board 3, the board to be inspected is set at a predetermined position on the XY actuator 2 and dedicated application software (hereinafter referred to as software) built in the personal computer 10 is started and registered in a hard disk (not shown) in advance. Load the board program. Then, an image as shown in FIG. 2 is displayed on the monitor 8 under the control of the CPU 11.
FIG. 2 is a schematic diagram of an image displayed on the monitor 8. The left image is a non-defective board component image (hereinafter referred to as a sample image) P1, and the right image is the same image of the inspection target board (hereinafter referred to as a component image). P2 is referred to as a live image. P3 is a component information list as a related information display means of the component being imaged, P4 is an “OK button”, P5 is an “NG button”, P6 is a “next screen display button”, and P7 is a “previous screen display button”. When these buttons are operated, the CPU 11 performs a predetermined operation according to the program.

  Thus, under the control of the CPU 11, the inspection board image being captured as the live image P2 is displayed, and the non-defective image is displayed as the sample image P1. Based on this monitor display, the operator visually compares both images and refers to the contents (symbol symbol, management code number, part number, part classification, part constant, etc.) displayed in the part information list P3. It is possible to determine whether the component mounted state displayed in the live image P2 is good or bad. If the result of determination is OK, the OK button P4 is pressed, and if it is defective, the NG button P5 is pressed. This operation is performed by a touch panel operation or a mouse operation, and the input pass / fail judgment result is stored in the personal computer 10.

  The sample image P1 and the live image P2 are switched in the order registered in the program by the next screen button P6 and the previous screen button P7, and at the same time, the camera 1 and the XY actuator 2 are moved to a predetermined position. A live image of the target part is displayed. P8 is a “symbol symbol search button”. When this button is operated, the symbol symbol of each part pops up and an image can be displayed by searching for a specific part and selecting it. It has become.

In this way, the inspection is carried out for all the mounted components programmed on the inspection board. Further, by performing a predetermined operation of the personal computer 10, a mapping image P9 as shown in FIG. A large number of points 17 displayed in FIG. 3 indicate the positions of mounted components to be inspected. The mapping image P9 is a diagram in which the progress status of the component inspection is schematically displayed and the determination status is displayed in different colors. For example, OK is green (indicated by Q1), NG is red (indicated by Q2), uninspected is gray (indicated by Q3), and the current inspection object is displayed in yellow (indicated by Q4). It is possible to see which part of the entire board occupies the component and what state the inspected component is in by the arrangement on the substrate.
When the part on the mapping image P9 is clicked with the mouse, the sample image P1 of the part is displayed, the camera 1 is operated, the XY actuator 2 is moved, and the live image P2 is displayed. It is possible to output a part from the image P9.

  In addition, after all the parts have been inspected, it is possible to play back and check an image of an NG location determined to be defective. The operator selects NG of the “movement mode selection button ALL / NG” P13 and presses the next screen button P6 and the previous screen button P7 or displays the mapping image P9 to display the NG mark (red) in the mapping with the mouse. Click to display the NG location. Moreover, since the data of the determination result is saved in a file in a text format, it is possible to confirm the NG location while browsing the data later.

In this way, since the non-defective image is stored and the non-defective image is displayed in accordance with the output of the inspection image, it is not necessary to search for a comparison part and the burden on the operator can be reduced. Since both the images are overlapped or adjacent to each other and the color is output, it is easy to carry out a comparative inspection, and it is possible to improve pass / fail judgment accuracy. Further, once the non-defective substrate data is acquired, this data is stored, so that it is not necessary to store the non-defective substrate thereafter.
In addition, since the component information list is displayed, it is possible to confirm in detail whether the correct component is mounted.

  In the above embodiment, the method of inspecting the mounted components one by one has been described. However, by performing a predetermined operation of the personal computer 10, live images P2 of a plurality of components are captured at once (recorded once) and sampled. A mode (cross picture mode) in which the image P1 and the live image P2 are displayed in an overlapping manner can be set. In this case, the image of the part to be inspected is temporarily stored in the recording memory 12a as the second recording unit.

  FIG. 4 shows a schematic diagram of the monitor 8 screen in this state. Here, the captured image of the camera 1 is displayed divided into 12 sections, and live images of 12 parts (12 locations) to be inspected are displayed in each area. In this case, the sample images of the respective parts can be superimposed and displayed, and every time the image switching button P10 is pressed, the live image P2 and the sample image P1 are switched and displayed.

  Further, P11 is a skeleton bar as an image output amount changing means, and the ratio of raising the sample image by sliding the triangle display part to the left and right by the mouse operation in the displayed bar-shaped range extending to the left and right. (100% of sample image is output to the left, 100% of live image is output to the right, and both are output at a ratio according to the position in the middle). Through these operations, 12 parts are visually inspected at a time, and the determination result can be checked for OK / NG by the determination button P12 provided in each image section (black circles in the figure indicate NG buttons, The white circle is an OK button).

In this way, by displaying a plurality of parts at the same time, the plurality of parts can be inspected at the same time, and the work efficiency of the inspection can be improved.
Also, by displaying the part image (sample image) of the non-defective board and the part image (live image) of the inspection board on the same site, it is easy to find the difference and minimize the movement of the viewpoint. Fatigue can be reduced.

The above is a method for inspecting in parts (part inspection), but the apparatus according to the present invention also has a function by a method for inspecting in an area surrounding a plurality of parts (block inspection).
When a mounting board to be inspected is set in the XY actuator 2 and a block inspection program for each board registered in advance in the hard disk is read by a predetermined operation of the personal computer 10, a sample image P1 of the first block is read on the monitor 8. And the live image P2 are overlapped and displayed as shown in FIG.

  In the schematic diagram shown in FIG. 5, P15 is an image switching button, P16 is a skeleton bar, P17 is an auto skeleton button, P18 is a marking button, P19 is a next screen button, P20 is a previous screen button, and P21 is a check / replay mode. Select button. By pressing the image switching button P15, the sample image P1 and the live image P2 can be switched, and by sliding the skeleton bar P16 to the left and right, the rate at which the sample image P1 floats on the surface can be adjusted (full left) Sample image P1). Further, if the auto skeleton button P17 is used, the slide of the skeleton bar P16 can be gently and automatically changed.

  When an abnormality is found in the inspection area of the substrate to be inspected by performing these operations, the marking button P18 for performing the marking / erasing operation is set to the marking, and then the mouse is dragged on the abnormal portion of the recorded live image. A red frame (not shown) is displayed on the image and recorded. If this check operation is sequentially performed by the next screen button P19 and the previous screen button P20 in the order of the block units registered in the program, the camera 1 and the XY actuator 2 move to a predetermined position each time, and the inspection object A live image P2 of the area is displayed, and a plurality of parts are sequentially displayed.

Thus, after inspecting the entire area of the substrate to be inspected, the operator can confirm the marking of the abnormal part by displaying the inspected live recording image by setting the mode select button P21 to the replay. At this time, the live recording image can be sent / returned by the next screen button P19 and the previous screen button P20.
As described above, in the case of components mounted in close proximity, a plurality of components can be displayed on one screen at the same time, and the inspection work efficiency can be improved as in the case of the multi-screen display as shown in FIG. be able to.

A component inspection program (including image data, position data, and component information data) that executes the above-described control is created by the personal computer 10, and there are two procedures. One is a method of manually creating the position coordinates and image taking of the camera 1 for each point (hereinafter referred to as manual teaching), and the other is using mounting data for mounting created in a predetermined format, This is a method for automatically taking the position coordinates of the camera 1 and taking an image (hereinafter referred to as auto teaching). However, the program for block inspection is created by manual teaching.
In any of the methods, a mounting board in a good state is first set, and the external dimensions of the board and the multi-piece number / pitch (in the case of a multi-chip board) are input. Subsequent procedures are divided into two types: manual / auto.

  In the case of manual teaching, the camera position is moved over all parts and all blocks and coordinates are input. At this time, component information (symbol symbol or the like) is manually input for each component, and the camera image is adjusted using the zoom / focus adjustment button to register (record) the image. In the case of auto teaching, it is performed by calling mount data for mounting (CSV format) recorded in a predetermined format. First, the camera position coordinates and then the component information are read and the camera 1 moves over all the components. It moves automatically and image registration (recording) is performed. However, since the zoom / focus of the camera 1 at this time is set as a default value, each image is edited with fine adjustment as necessary.

Note that this teaching work is sufficient for one board in the case of a multi-piece board, and information is developed on all boards according to the multi-piece number / pitch pitch that has been input previously. On the other hand, a similar imaging operation can be performed.
Further, if the zoom amount differs greatly between the moving images of the camera 1, the entire inspection time can be lost. Therefore, the inspection order is set so that the components having the same zoom amount are kept under the zoom adjustment value under the control of the CPU 11 as the sorting means. Are rearranged (sorting is performed), and if the focus time is also necessary, they are sorted and rearranged. By doing so, the camera adjustment time such as the entire zoom time can be minimized, the entire image output operation time can be shortened, and the loss time during the operation of the apparatus can be reduced.

It is a block diagram which shows an example of embodiment of the mounting board inspection apparatus which concerns on this invention. It is a monitor screen schematic diagram of FIG. It is a schematic diagram of the mapping image pop-up displayed. FIG. 6 is a schematic diagram of a monitor screen that displays a plurality of copy images. It is a schematic diagram of the other picture output state of a monitor screen.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Camera, 2 ... XY actuator, 3 ... Mounting board, 4 ... Camera control circuit, 8 ... Monitor, 10 ... Personal computer, 11 ... CPU of personal computer (output control means, Sorting device), 12a..Recording memory (first recording device, second recording device), 12b..Component memory (component information storage device), P1..Sample image (component image of non-defective substrate), P2..Live Image (part image of inspection board), P3 ..part image list (related information display means), P4 ..OK button (determination input means), P5 ..NG button (determination input means), P6 ..next screen display Button (part selection means), P7 ..Previous screen display button (part selection means), P12 ..judgment button (judgment input means), P10 ..image switching button, P11. Amount changing means), P15 ..Image switching button, P16 ..Skeleton bar (image switching button), P17 ..Auto skeleton button (image switching button), P19 ..Next screen button (part selection means), P20. Previous screen button (part selection means).

Claims (4)

Component information storage means for storing component information such as the position of a component to be inspected on a mounting board, a management code number, a product number, and a symbol symbol;
An image input means comprising a camera for imaging the mounted component and its control circuit;
A monitor for producing a color image of the camera image;
First recording means for storing a captured image of a specific substrate;
Component selection means for selecting a mounted component to be inspected;
A determination input means for inputting the inspection result;
Image output control means for performing image output control on the monitor by superimposing an image captured by the camera and an image stored in the first recording means ;
An image output amount changing means for emphasizing and outputting any one of the images output in an overlapping manner ;
The image output control means controls the image input means so as to take an image of a part selected in response to an operation of the part selection means, and causes the monitor to output an image, and an image recorded in the first recording means selected parts and images of the same part, mounted component inspection device for causing bounded out to overlap the same image output unit of the monitor of the. 2. The mounting according to claim 1, further comprising a related information display unit configured to display, on the monitor, component information of a corresponding mounted component stored in the component information storage unit in accordance with the output component image. Parts inspection device. The mounting component inspection apparatus according to claim 1, further comprising a sorting unit that sorts the inspection order so that components having the same zoom amount are consecutive when the inspection of each component is continuously performed. A second recording means for storing a component image of the board to be inspected, wherein the output control means causes the plurality of stored part images under inspection to be output on the monitor and simultaneously stored in the first recording means; The mounted component inspection apparatus according to claim 1, wherein the component images of the same part are also displayed together.

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