JPS63173172A - Device for inspecting mounted board - Google Patents

Abstract

PURPOSE:To inspect the matching state of a land pattern of a position corresponding to the size of a parts, etc., by processing an image obtained by image picking up at an image pickup part, and deciding the normal/defective condition of the land pattern formed on a board. CONSTITUTION:An X-Y table 20, an illumination part 21, and a processing part 22 are provided on an inspecting device, and a bit of land information is extracted from the image obtained by image picking up a non-mounted board 25 based on the position and shape data inputted by using a board 24 for teaching. The normal/defective condition of the land pattern is decided based on the bit of land information and the position information and the shape data of the parts, and an inspection data file is generated, and based on the file, a board 26 to be inspected is inspected based on the file. The table part 20 drives pulse motors 31 (31a, 31b) and 32 being operated based on a control signal from a processing part 23. And the normal/defective condition of the land pattern generated on the board 26 is decided by a deciding part CPU46 in the processing part 23, and the state of matching of the pattern corresponding to the size of the parts is inspected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mounted board inspection device that can also determine the quality of a land pattern formed on a board.

(Prior Art) As a mounted board inspection device for inspecting a mounted board created using a mounter or the like, the one shown in FIG. 14 is conventionally known.

The mounted board inspection apparatus shown in this figure includes a mounted board 2b to be inspected on which a component 1b is mounted, and a reference mounted board 2 which serves as an inspection standard.
a, a storage unit 4 that stores an image 1ll (reference image) of the reference mounting board 2a obtained by the TV camera 3; T■ Compare the image of the board to be inspected 2b supplied from the camera 3 (image to be inspected) to determine whether all the components 1b are present on the board to be inspected 2b;
Furthermore, it is configured to include a determination circuit 5 that determines whether or not these components 1b are misaligned or not, and a display 6 that displays the determination results of this determination circuit 5.

(Problems to be Solved by the Invention) By the way, such a conventional mounted board inspection device cannot distinguish between the image of the component 1a on the reference mounted board 2a and the bisexuality of the part 1b on the inspected mounted board 2b. Since we are directly comparing the parts 1b to check for falling off or misalignment, we can check the position and size of the land pattern formed on each board 2a, 2b due to a design error, etc., and the size of the parts 1a, 1b. If the shape is not matched, part 1
Even when the component 1b and the land pattern corresponding to the component 1b are not in a predetermined positional relationship, it may be determined that the component 1b is properly mounted.

In view of the above circumstances, the present invention has been developed to detect the size of components mounted on a board, in addition to detecting component dropouts and positional deviations.
It is an object of the present invention to provide an actual board inspection device that can detect whether the shape, etc. matches the position, size, etc. of a land pattern corresponding to this component.

(Means for Solving the Problems) In order to solve the above problems, a mounted board inspection apparatus according to the present invention images a mounted board and processes the obtained image according to a predetermined processing procedure. The mounted board inspection apparatus for inspecting the state of component mounting on the mounted board includes an imaging section that detects the board, and a land pattern formed on the board by processing the image obtained by the imaging section. The device is characterized in that it includes a determining section that determines whether the device is good or bad.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of a mounted board inspection apparatus according to the present invention.

The mounted board inspection VtE shown in this figure is equipped with an X-Y table section 20, an illumination section 21, an imaging section 22, and a processing section 23. Based on position/shape data, unmounted board 2
After extracting land information from the image obtained by performing step 5, it is determined whether the design of the land pattern formed on the unmounted board 25 is good or bad based on this land information and the position and shape data of the component. The judgment result is displayed. Thereafter, an inspection data file is created, and the mounting board 26 to be inspected is inspected based on this inspection data file.

The illumination unit 21 includes one ring-shaped white light source that is turned on/off (or dimmed) based on a control signal from the processing unit 23.
The light is turned on when an illumination on signal is supplied from the processing unit 23, and the X-Y
The upper surface side of the table section 20 is illuminated.

The X-Y table section 20 includes pulse motors 31a and 31b that operate based on control signals from the processing section 23;
An X-Y table 32 is driven in the X-axis direction and the Y-axis direction by each of these pulse motors 31a131b, and each substrate 24 to 26 is mounted on the R1 ! When the processing section 23 outputs a control signal, each of the substrates 24
- 26 on an X-Y table 32. Each of the substrates 24 to 26 fixed by the chuck mechanism 33 is illuminated by the illumination unit 21 and transported by the image carrier unit 22. be done.

The Wl image section 22 includes a color TV camera 34 provided above the illumination section 21, and the Wl image section 22 includes a color TV camera 34 provided above the illumination section 21.
The optical image No. 6 is converted into an electrical image (R, G, B color signals) by this color TV camera 34 and sent to the processing unit 23.
supplied to

The processing section 23 includes an A/D conversion section 36, a memory 37, a teaching table 38, an image processing section 39, and an X-Y
It is equipped with a stage controller 41, an imaging controller 42, a CRT display 43, a printer 44, a keyboard 45, and a control unit (CPU) 46, and during teaching, the power is supplied from the imaging unit 22. The R, G, and B color signals of each board 24 and 25 are processed to determine whether the setting H1 of the land pattern formed on the unmounted board 25 is good or not, and the result of this determination is displayed. Thereafter, an inspection data file for inspecting the mounting board 26 to be inspected is created. At the time of inspection, the RlG and B color signals of the mounted board 26 to be inspected supplied from the image carrier 22 are processed based on the inspection data file, and the signals formed on the mounted board 26 to be inspected are processed. It is determined whether the relative position between the land 28C and the component 27c is within an allowable range, and the result of this determination is displayed.

The A/D converter 36 receives an image signal (R
SG, B color signal), this is A/
D conversion (analog-to-digital conversion) is performed to create color image data, which is supplied to the control section 46.

Furthermore, the memory 37 includes a RAM (random access memory) and the like, and is used as a work area for the control section 46.

Further, when image data is supplied via the control unit 46, the image processing unit 39 binarizes this image data to extract position and shape data of parts, or cuts out necessary images from the image data. It is configured to perform hue/brightness conversion on this cut out image, binarize this hue/brightness conversion result using a predetermined threshold, and extract the position, shape, etc. of the land pattern. Each data obtained is supplied to the control section 46.

Furthermore, the teaching table 38 is equipped with a floppy disk device, etc., and when it is supplied with an inspection data file etc. from the control section 46, it stores it, and when a transfer request is output from the control section 46, it stores this request. The inspection data file and the like are read out in accordance with the above, and are supplied to the control section 46.

The imaging controller 42 also includes an interface that connects the control section 46 with the illumination section 21 and the imaging section 22, and controls the illumination section 21 and the imaging section 22 based on the output of the control section 46. control.

Further, the X-Y stage controller 41 includes the control section 4
6 and the X-Y table section 20, and controls the X-Y table section 20 based on the output of the control section 46.

The CR7 display 43 is equipped with a cathode ray tube (CRT), etc., and receives image data, judgment results, etc. from the control section 46.
When key human power data etc. are supplied, this is displayed on the screen.

Further, when the printer 44 is supplied with the determination results and the like from the ti1N unit 46, it prints out the results in a predetermined format.

The keyboard 45 also includes various keys necessary for inputting operation information, data regarding the name of the board 26 to be inspected, board size, etc., data regarding the component 27c on the board 26 to be inspected, etc. Information, data, etc. input from this keyboard 45 are supplied to a control section 46.

The control unit 46 includes a microprocessor and the like, and operates as described below.

First, when inspecting a new mounting board 26 to be inspected,
In step ST1 of the teaching flowchart shown in FIG. 2A, the control unit 46 displays a message requesting the board name (for example, board identification number @) and board size on the CRT display 43.

When the board name and board size are input from the keyboard 45, the control unit 46 places the teaching board (component 2) on the X-Y table 32 in step ST2.
Wait until the mounting board 24 (with part 7a painted white and other parts black) is mounted. After this, this board 24
is placed, the control section 46 controls the X-Y table section 20 to place the first part of the substrate 24 below the color TV camera 34.
Place the R image area.

Next, the control unit 46 causes the A/D conversion unit 36 to A/D convert the image and other signals obtained by the color TV camera 34, and stores the A/D conversion results (image data of the board 24) in the memory 37 in real time. Let me remember it.

Next, the control section 46 sequentially reads out the R pixels (or G, B pixels) of the image data stored in the memory 37, and the image processing section 3 binarizes the R pixels (or G, B pixels), so that the white color of the substrate 24 is After extracting the painted part (part 27a part), each part 27a obtained by this extraction operation
position data and shape data are stored in the teaching table 38.

Thereafter, the control unit 46 displays the position and shape screen 29 of the component 27a as shown in FIG. 3 based on the position data and shape data of each component 27a stored in the teaching table 38 in step ST3. Create and CR this
7 on the display 43, and also displays a message requesting manual input from the keyboard 45 for special parts.

Here, if the operator inputs the position data and shape data of the special part, the position data and shape data of the special part stored in the teaching table 38 are corrected accordingly.

Next, the control unit 46 sequentially reads out the position data and shape data of each component 27a stored in the teaching table 38 in step ST4, and determines the possible land existence range for each component 27a as shown in FIG. Set 30.

In this case, the land possible range 30 is set to find a land that connects to the component 27a, and even if the component 27a is a three-pole component such as a transistor, or a 2Ifi component such as a resistor or a capacitor. However, the land is set wide so that it is possible to find that land.

Then, if the land possible range 3o is obtained for all parts 27a in the first image transfer area, the controller 4
6 stores each land possible range 30 in the teaching table 38, returns to step ST2 via step ST5, and when the land possible range 30 is obtained for the remaining retraction area, step ST5
The process branches to step ST6.

Then, in this step ST6, the control section 46:
Wait until the teaching board 24 is removed from the XY table section 20 and the unrealized Ili board 25 is placed on it.

Next, an unmounted board 25 is placed on this X-Y table section 20.
is set, the control section 46 controls the X-Y table section 20
control the unmounted board 2 below the color TV camera 34.
5, the first R image area is located.

Thereafter, the control unit 46 performs A/D conversion on the image signal obtained by the color TV camera 34, and also performs A/D conversion on the image signal obtained by the color TV camera 34.
The D conversion result (image data of unmounted board 25) is stored in memory 3.
7 to memorize it in real time.

Next, the control unit 46 sequentially reads out the possible land existence range 30 for the component 27a in the first decoy image area from the teaching table 38 and supplies it to the image processing unit 39, and also stores it in the memory 37. The image data of the unmounted board 25 is supplied to the image processing unit 39, and an image of the land possible range 30 (an image within the land possible range 30) is cut out from this image data.

Next, the control section 46 supplies a hue/brightness conversion command to the image processing section 39 to convert each pixel constituting the image within the land possible range 30 into hue/brightness.

As the hue-lightness conversion formula in this case, for example, the following formula is used.

BRT (Hei) = R (ij) 10G (ij) + B (
ij)...(1) Rc (ij)=α・R(ij)/
8 RT (ij)...(2) G c (ij)
−α・G (ij)/B RT (ij)...(
3) B C (ij) = α・B (ij) / B RT
(ij)...(4) However, in this case, R(ij):
R signal strength G (ij) of the pixel (pixel (ij)) in the i-th row and j-th column: G signal strength B (ij) of the pixel (pixel (ij)) in the i-th row and j-th column: 8 signal strength B of the pixel (pixel (ij)) in the i-th row and the j-th column RT (ij): Brightness α of the pixel (ij): Coefficient Rc (ij): Red hue G c of the pixel (ij) (i
j): Green phase of pixel (ij) B c (ij): Blue phase of pixel (ij) And the land possible range 3
When the hue-lightness conversion described above is completed for all pixels within 0, the control unit 46 converts the land extraction reference value C into which the red hue RC(ij) for each pixel (ij) within the land possible range 30 is input in advance. (For example, C=0.4·α) or more is checked, and the land 28b within the possible land existence range 30 is extracted.

Thereafter, the υ control unit 46 stores the position data and shape data regarding this land 28b in the teaching table 38, and also checks the number and position of lands 28b that can be connected to the component 27a.

In this case, as shown in FIG. 5(A), there are three lands 28b that can be connected to the component 27a, and these lands 28b are arranged at a ratio of 1:2 on opposite edges of the component 27a. If so, the control section 46 recognizes this component 27a as a transistor. After this, the control unit 46 moves the component 27a from the position of each land 28b with respect to this component 27a.
Find the correct position of the part 27 as shown in Figure 5 (B).
The position of a is corrected, and the position data of the part 27a stored in the teaching table 38 is corrected based on the correction result.

Further, as shown in FIG. 6(A), there are two lands 28b that can be connected to the component 27a, and these lands 28b are arranged at a ratio of 1:1 on opposite edges of the component 27a. If so, the control unit 46 recognizes this component 27a as a two-pole component such as a resistor or a capacitor. Then, from the position of each land 28b with respect to this component 27a, the component 2
7a is determined, the position of the part 27a is corrected as shown in FIG. 6(B), and the position data of the part 27a stored in the teaching table 38 is corrected based on the correction result.

After that, in step ST8, the control unit 46 performs the steps shown in FIG. 7(A).
After calculating the land spacing for each component 27a as shown in (B), it is checked whether the land spacing and the size of the component 27a are appropriate.

If these are not in the appropriate proportions, the 8th
As shown in the figure, in the error message area EF on the CR1 display 43, there is a message such as "No. . Display the message and ask the operator to select part 27.
a and the land 28b to which this component 27a is connected are not matched.

Next, the control unit 46 performs the process shown in FIG. 9(A) in step ST9.
, widening the shape of the land 28b as shown in (B),
The land inspection area 50b is calculated and stored in the teaching table 38.

Thereafter, in step 5T10, the control unit 46 determines the position and shape of the land 28b in FIGS.
), a component body inspection area 51b for cutting out the central portion of each component 27a is calculated and stored in the teaching table 38, and characteristic data regarding the body of each component 278' is displayed on the CR1 display 43. display a message requesting (for example, color data).

Then, the operator operates the keyboard 45 to select all parts 2.
When the feature data 7a is input, the I control unit 46 stores it in the teaching table 38.

When the land extraction process and the feature data input process are completed for all of the parts 27a in the first imaging area, the control unit 46 returns to step ST6 via step 5T11, and processes the remaining imaging area. Then, the above-described process is repeatedly executed.

After this, all l1lIi! When the above-described processing for the area component 27a is completed, the control unit 46 branches from step 5T11 to step 5T12.

In step 5T12, the control unit 46 organizes each data stored in the teaching table 38 to create an inspection data file, stores this in the teaching table 38, and ends the teaching operation.

When this teaching operation is completed and inspection is required, the control unit 46 requests the board name of the mounted board 26 to be inspected on the CR1 display 43 in step 5T13 of the inspection flowchart shown in FIG. 2(B). display the message to be sent.

Then, if this board name is input from the keyboard 45, the control section 46 controls the X-Y table 3 in step 5T14.
2 until the mounting board 26 to be inspected is placed on it. After this, when this mounting board 26 to be inspected is mounted, the control unit 46
controls the X-Y table section 20 to control the color TV camera 3.
4, the first R image area of the mounting board 26 to be inspected is placed below the inspection target mounting board 26.

Next, the control unit 46 causes the A/D conversion unit 36 to A/D convert the image signal obtained by the color TV camera 34, and stores the A/D conversion result (image data of the mounted board 26 to be inspected) in the memory 37. be stored in real time.

Next, the control unit 46 reads out the component body inspection area 51b from the teaching table 38 and supplies it to the image processing unit 39, and also sends the image data of the board to be inspected 26 stored in the memory 37 to the image processing unit. 39
from this image data to the component body inspection area 5.
Cut out image 1b.

Next, the control unit 46 supplies a feature extraction command to the image processing unit 39 to extract feature data of the image cut out by the component body inspection area 51b (for example,
(converts each pixel of the image from hue to brightness).

Thereafter, in step 5T15, the control unit 46 determines whether the feature data of the image within the component body inspection area 5Ib matches the feature data of each component 27a stored in the teaching table 38, and if If they match, the process branches from step 5T15 to step 5T16, where the land inspection area 50b is read out from the teaching table 38 and supplied to the image processing section 39, and is stored in the memory 37. The image data of the mounting board 26 to be inspected is supplied to the image processing section 39, and an image of the land inspection area 50b is cut out from this image data.

Next, the control section 46 supplies a hue/brightness conversion command to the image processing section 39 to convert each pixel constituting the image of the land inspection area 50b into hue/brightness.

When the above-described hue and brightness conversion is completed for all the yarns in the land inspection area 50b, the control unit 46 proceeds to step ST17 for each pixel (i) in the land inspection area 50b.
Check whether the red hue Rc (ij) for j) is equal to or higher than a pre-input land extraction reference value C (for example, C=0.4·α), and extract the land 28G within the land inspection area 50b. .

After that, in step 5T18, the control unit 46 performs BRT(:j) for each pixel (ij) in the land inspection area 1a50b.
The electrode 47G located within the land inspection area 50b is extracted by checking whether or not the value is greater than or equal to a pre-input electrode extraction reference value.

Next, in step 5T19, the control unit 46 determines the shape of the land 28C and the teaching table 3 while referring to the position t and shape of the electrode 47c in the land inspection area 50b.
The shape of the land 28b of the unmounted board 25 stored in 8 is compared with the shape of the land 28b of the unmounted board 25 to screen out (estimate) the portion of the land 28C that is hidden by the component 27c.

Thereafter, in step 5T20, the control unit 46 determines the land 2 as shown in FIGS.
8c and component 27c, and determine whether the values of each of these data are sufficient. Check.

And if each of these values is sufficient, ill 111
The section 46 branches from step 5T20 to step 5T21, where it determines that the component 27c is properly mounted and displays it on the CRT display 43 or prints it out from the printer 44. .

Further, in each step 5T15 and 5T20, it is determined that the feature data of the image within the component body inspection area 51b does not match the feature data of each component 27a stored in the teaching table 38, or the land 2
If it is determined that the cover area data, width data, and depth data indicating the positional relationship between the part 8c and the component 27c are insufficient, the control unit 46 performs each of these steps 5T15.5T2.
0 to step 5T22, where this part 27
G is determined to be defective in mounting, and the CRT display 43
This can be displayed on top or printed out from the printer 44.

Thereafter, the control unit 46 returns to step 5T14 via step 5T23, and repeatedly executes the above-described process for the remaining R image areas.

Then, when the determination process has been completed for all the parts 27c in the R1 & area, this inspection process is ended.

In this way, in this embodiment, the future mounting board 27a
Since the image of the land 28b is extracted and it is displayed whether the land 28b and the component 27a are matched, it is possible to immediately know if the design of the land 28b itself is bad. In addition, even if the land 28c of the board 26 to be inspected is different for each board, if the component 27c is mounted within an allowable range on the land 28c, it can be determined that the mounting is good. It is possible to prevent erroneous judgments due to processing errors of the board, and also to automatically set the optimum permissible positional deviation times for each component 27C.

As a result, FIGS. 12(A) and 13(A), (
In the case shown in B), it is determined that the mount is good, and in the case shown in Figs. 12 (B), (C) and Fig. 13 (C), (
In the case shown in D), it can be determined that the mounting is defective.

Furthermore, in the embodiment described above, during teaching,
Although the feature data of the component 27a is manually input, it may also be automatically input using a reference mounting board or the like.

Further, in the above-described embodiment, the position and shape of the part 27a input using the teaching board 24,
Although the land pattern is evaluated by comparing the input position and shape of the land 28b using the unmounted board 25, the input position and shape of the component are compared using the reference mounted board. The land "28b may be evaluated by comparing the position and shape of the land 28b input using the unmounted board 25."

(Effects of the Invention) As explained above, according to the present invention, in addition to detecting dropping of components and positional deviation, it is also possible to detect the size, shape, etc. of components mounted on a board and the land pattern corresponding to this component. It is possible to check whether the position, size, etc. are matched.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a mounted board inspection device according to the present invention, FIG. 2(A) is a flowchart showing an example of the teaching operation of the same embodiment, and FIG. 2(B) is an inspection of the same embodiment. FIG. 3 is a schematic diagram showing an example of the location and shape screen of parts in the same embodiment; FIG. 4 is a schematic diagram showing an example of the land existence four function range used in the same embodiment; 5(A) is a schematic diagram showing an example of a component determined to be a transistor in the same embodiment, FIG. 5(B) is a schematic diagram for explaining the component position correction operation in the same embodiment, and FIG. (A) is a schematic diagram showing an example of a component determined to be a resistor or a capacitor in the same embodiment, FIG. 6(B) is a schematic diagram for explaining the component position correction operation in the same embodiment, and FIG.
) and (B) are schematic diagrams for explaining the land pattern evaluation operation of the same embodiment, FIG. 8 is a schematic diagram showing a display example of land pattern evaluation contents in the same embodiment, and FIG. 9 (A
>, (B) are schematic diagrams each showing an example of the land inspection area for each part of the same embodiment, and Figures 10 (A) and (B) are each an example of the component body inspection area for each part of the same embodiment. FIGS. 11(A) and 11(B) are schematic diagrams for explaining the determination operation regarding the positional relationship between the components and lands in the same embodiment, and FIGS. 12(A) to (C) are schematic diagrams shown in FIG. 13(A) to (D) are schematic diagrams for explaining determination examples of the same embodiment, and FIG. 14 is a conventional mounting board inspection. It is a block diagram showing an example of a device. 22...llil II part, 25... Unmounted board, 2
6...Inspected mounting board, 27a, 27cm...Components,
28b. 28c... Land, 46... Judgment unit (control unit). Agent: Patent attorney Tetsuji Iwakura (and 1 other person) Figure 3
Figure 5 (A) Figure 5 (B) )) 1. ) 28b28b28b28b Fig. 6 (A) Fig. 6 CB) Engraving of specification (no change in content λ Fig. 7 (A) Fig. 7 (B) Land opening - Fig. 8 (0i9 Σ(A) Σ (B) 7a 28b47a 28b -2I2 Medicine Diagram (A) Second (B) 28c 4
7c Bud Decoy (A) Miya:, 1 Figure (B) 13 Ra To Figure (C) Ka Figure (D) 1 year old 41c 27c 47C47C Procedure Ne...Ordinary book (method) % formula % 1, Indication of incident 1986 Patent Application No. 5276 2
, Name of the invention: Mounted board inspection device 3, Person making the amendment Representative: Takao Tateishi 4, Agent 5, Date of amendment order (shipment date) March 3, 1988
1st 6. Drawings subject to amendment

Claims (1)

[Claims] In a mounted board inspection apparatus that images a mounted board and processes the obtained image according to a predetermined processing procedure to inspect a state of component mounting on the mounted board, an imaging unit that takes an image of the board; A mounting board inspection device comprising: a determination unit that processes an image obtained by the imaging unit and determines the quality of the land pattern formed on the board.