JPS62261047A - Printed circuit board processor - Google Patents

Abstract

PURPOSE:To enable the teaching of a correct reference data even when a teaching board or the like is made very roughly, by inputting correction information to correct part information previously inputted and memorized. CONSTITUTION:An inspecting device is made up of an X-Y table section 14, a photography section 15 and a processing section 16. The processing section 16 generates a window based on an image signal obtained by photographing 15 a teaching board 32 and corrects the window when correction information from a keyboard 30 is inputted. Using an accurate window obtained by this correction processing, an part image data is picked out from binary-coded image data obtained separately by photographing a reference printed circuit board 10-1 and a printed circuit board 10-2 to be inspected to compare feature parameters of the part image data. Based on the results of the comparison, a part 13b on the printed circuit board 10-2 being inspected is checked for missing and causing positional deviation.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention can be used as a mounter for mounting components on a printed circuit board, a printed circuit board inspection device for checking whether components are correctly mounted on a printed circuit board, etc. The present invention relates to a printed circuit board processing apparatus used.

(Prior Art) When an automatic mounting device is used to mount various chip parts such as resistors and semiconductor elements on a printed circuit board, it is possible that the parts are not mounted according to the mount data at the mount tν. be.

Therefore, when using such automatic mounting equipment, the printed circuit board is checked after mounting to ensure that the correct chip components are mounted in the correct position and orientation (position, h direction) on the printed circuit board. whether or not
It is also necessary to inspect whether or not it has fallen off.

However, if such an inspection is performed by manual visual inspection as in the past, there are problems in that it is not possible to completely eliminate the occurrence of inspection errors, and it is not possible to increase the inspection speed.

Therefore, in recent years, manufacturers have proposed various automatic inspection devices for printed circuit boards that can automatically perform this type of inspection.

FIG. 6 is a block diagram showing an example of such an automatic inspection device.

The automatic inspection device shown in this figure compares the reference data input in advance with the data to be inspected obtained by flushing the printed circuit board 1 to be inspected, and checks all the components 2- 1 to 2-n are placed on the keyboard 3, and whether these parts 2-1 to 2-n have shifted position. 4, a TV camera 5, a processing section 6, and a display section 7.

The keyboard 3 is equipped with various keys such as a function key and a numeric keypad, and is used to store standard data when an operator or the like inspects the printed circuit board 1 to be inspected, that is, type data of the printed circuit board 1 to be inspected, and this printed circuit board to be inspected. The color data of the parts 2-1 to 2-n that should be on the printed circuit board 1 to be inspected, position data for mounting, posture data for mounting, shape data, etc., and feature data such as shape data for the parts 2-n to be placed on the printed circuit board 1 to be inspected based on these feature data. When the tolerance value data and the like necessary for inspecting the quality of each of the parts 2-1 to 2-n are input, each of these data is supplied to the storage section 4.

The storage section 4 is equipped with a RAM (random access memory), etc., and stores each data supplied from the keyboard 3, and also supplies this to the processing section 6.

The processing unit 6 processes the image of the printed circuit board 1 to be inspected obtained by the TV camera 5, and obtains each characteristic data ( The data to be inspected) is extracted, the data to be inspected is checked based on the reference data stored in the storage section 4, and the check result is supplied to the display section 7 to display each of the parts 2-1 to 2. -Display the quality of n.

(Problem to be Solved by the Invention) By the way, this type of automatic inspection system C inputs reference data from the kneeboard 3, so it takes a lot of time to input it when there are a large number of parts. There was a problem.

Therefore, in order to eliminate such inconveniences, conventionally, a reference printed circuit board or a teaching board is created as an inspection reference for the printed circuit board 1 to be inspected, and these reference printed circuit boards, etc. are imaged by a TV camera 5 to create reference data. It is also being done.

However, in this case, with the method of creating reference data by making a flu image of the reference printed circuit board, it is difficult to extract only the component image from the image signal obtained by the TV camera 5, so it is difficult to obtain accurate reference data. There is.

In addition, with the method of creating reference data using a teaching board, it is necessary to paint the base board part and the component part in different colors, so it is difficult to accurately paint unless a considerable amount of time is spent on painting. The problem is that it is not possible to make a board that is

In view of the above circumstances, it is an object of the present invention to provide a printed circuit board processing apparatus that can teach correct V& reference data even if the teaching board or the like is made quite roughly.

(Means for Solving the Problems) In order to solve the above-mentioned problems, a printed circuit board processing apparatus according to the present invention provides a printed circuit board processing apparatus that processes printed circuit boards. A storage unit, an input unit for inputting component correction information, and a control unit for correcting the component information stored in the component information storage unit based on the component information input from the input unit. It is characterized by

(Example) Fig. 1 shows printed circuit board processing 1!1! according to the present invention. FIG. 2 is a block diagram of a printed circuit board inspection apparatus to which an embodiment of the apparatus is applied, without showing -91.

The printed circuit board inspection apparatus shown in this figure is equipped with an X-Y table section 14, a dancing image section 15, and a processing section 16.
The teaching board 32 is configured to be able to correct the window (cutout window of the part image rA) obtained by 1% after rimming. This printed circuit board inspection apparatus uses the accurate window obtained by this correction process to visualize the printed circuit board 10-1 and the printed circuit board to be inspected 1°-2. 2
Component image data is cut out from the normalized image data, the characteristic parameters of each of these component image data are compared, and based on the comparison results, it is determined whether the component 13b on the printed circuit board 10-2 to be inspected has fallen off or is misaligned. Check to see if it is.

The X-Y table unit 14 is operated by a pulse motor 1718 that operates based on a control signal from the processing unit 16, and by each of these pulse motors 17.18.
The X-Y daple 19 driven in the axial direction and this
A bin 20a for positioning a printed circuit board provided on the table 19.

20b, each of the printed circuit boards 10-1.
10-2 and teaching board 32 on X-Y table 1
9, each printed circuit board 10-1.10-2
The positioning holes formed in the teaching board 32 and the respective bins 20a.

20b, the printed circuit boards 10-1, 10-2 and teaching board 32 are positioned.

@The image section 15 includes a color TV camera 21 provided above the X-Y table section 14 and a ring illumination device a22 provided on the front side of the lens of the color TV camera 21. The printed circuit boards 10-1 and 10-2 are imaged by the color TV camera 21 while being illuminated by the ring illumination device 22, and the image signal obtained by this first decoy image is supplied to the processing section 16. .

The processing unit 16 creates a window based on the image signal of the teaching board 32 supplied from the imaging unit 15, and then corrects this window when a correction command for this window is input. The image signal of the reference printed circuit board 10-1 supplied from the ratio imager 15 and the printed circuit board 1 to be inspected are
-λ (By cutting out the component image part from the image signal of the board 10-2 and comparing it, the printed circuit board 10-
This is a part that determines whether the component 13b on 2 has fallen off or is misaligned.
6, an XY stage controller 27, a CR7 display 28, two printers, a keyboard 30, and a control unit (CPU) 31.

When the A/D conversion section 23 is supplied with an image signal from the imaging section 15, it performs A/D conversion (analog-to-digital conversion) to create image data, and supplies this to the control section 31.

Further, the memory 24 includes a RAM (random access memory), etc., and is configured by the control unit 3.
It is used as a work area.

Further, the image processing unit 26 is configured to convert the image data into 21ilI using the threshold when it is supplied with image data and a threshold via the control unit 31, and this binarization result (binary image data) is supplied to the control section 31.

Furthermore, the teaching table 25 is equipped with a floppy disk device, etc., and stores data files etc. when supplied from the control section 31, and also performs 1)
When the control unit 31 outputs a transfer request, it reads out a data file etc. in response to this request and transfers it to the control unit 31.
Supply to etc.

Further, the X-Y stage controller 27 is connected to the control section 31.
and the X-Y table section 14, and controls the X-Y table section 14 based on the output of the control section 31.

Further, the CR7 display 28 is equipped with a cathode ray tube (CRT), and receives image data from the control section 31.

When the judgment result, key human power data, etc. are supplied, this is displayed on the screen.

Further, when the two printers are supplied with the determination results and the like from the control section 31, they print them in a predetermined format.

Further, the keyboard 30, as shown in FIG. Part 13a on top
The keyboard 30 is equipped with various keys necessary for inputting relevant data, and information, data, etc. input from the keyboard 30 are supplied to a control section 31.

The all II 11 unit 31 includes a microprocessor and the like, and controls the A/D converter 23 to the keyboard 30 and processes various data based on a program input in advance.

Next, the operation of this embodiment will be explained with reference to the flowcharts shown in FIGS. 3(A) to 4(C) and FIG.

First, when inspecting a new printed circuit board 10-2 to be inspected, the control unit 31 initializes each part of the circuit in step ST1 of the sizing flowchart (main chart) shown in FIG. After setting the to the teaching mode, in step ST2, the component position teaching board 35 shown in FIG. Ku.

Here, the operator instructs to create a window screen file using the teaching board 32 and
When the teaching board 32 is set on the Y table section 14, the control section 31 performs the steps from step ST3 to step S.
Branches to T4, where the X-Y table unit 14 is controlled to cause the imaging unit 15 to image the first divided area of the teaching board 32, and the image signal obtained by this Ifii image rotation operation is transmitted. The A/D converter 23 converts it into a digital signal (image data).

In this case, the teaching board 32 refers to the parts position,
This is a component mounting board made to teach the device the shape of the component, and the base board portion is is black, and its parts are painted white.

Next, the control section 31 transfers the image data to the image processing section 26 in step ST5, and converts this image data into 2Ii.
In step ST6, a label (identification number) is attached to each part image obtained from the 2-fiff conversion result.

Thereafter, the control unit 31 checks in step ST7 whether there are any parts that have been labeled redundantly, and if a new label has been added to an already labeled part, it is removed.

Next, the control unit 31 checks whether the number of parts newly labeled in step ST8 matches the number of parts entered via the keyboard 30, and if they match, the control unit 31 performs step ST8. In ST9, a window (data import window) matching the position and shape of each part is created.

After that, in step 5TIO, the control unit 31 creates a file in which each window is associated with a label name,
The control unit 31 stores this in the teaching table 25 as a window screen file. Next, in step 5T11, the control unit 31 checks whether the processing of all divided areas on the teaching board has been completed, and if any divided areas that have not yet been processed are If remains, this step ST
11, the process returns to step ST4, and the above-described process is executed for the remaining divided areas.

When the processing has been completed for all the divided areas, the control section 31 ends the component position checking routine 35 and returns to step 5T15 of the main flowchart.

Further, in step ST3, if the operator instructs to create a window screen file from the component position mask and sets the component position mask in the X-Y table section 14, the control section 31 branches from step ST3 to step 5T12. Here, the X-Y table section 14 is controlled to cause the &i image section 15 to image the first divided area of the component position mask.

In this case, the part position mask is ! J 2% printed circuit board 10-1 and actual size drawings made when creating this standard printed circuit board 10-1 are used.

The image signal obtained by conveying this component position master is converted into image data by the A/D converter 23, and then supplied to the controller 31 and displayed on the CR1 display 28.

Here, this CRT display i! ! While looking at the screen displayed on 1i28, the operator presses the arrow key 4 on the keyboard 30.
4a to 44d (or a mouse, etc.) to individually point each corner of each part image displayed on the screen, the control unit 31 takes in this point instruction information in step 5T13 and uses this information. Based on this information, the outline of the part image displayed on the screen is known.

Then, when the input of the part contours for all the part images displayed on the CR1 display 28 is completed by this point instruction operation and the operator presses the end key,
In step STI 4, the I control section 31 labels each part contour.

After this, the control unit 31 performs steps 5T7a-8TIO
In step a, a process similar to steps ST7 to ST5TIO is performed to create a window for each part, and each of these windows and a label name are stored in the teaching table 25 as a window screen file.

Next, in step ST11a, the control unit 31 checks whether the processing of all the divided areas of the component position mask has been completed, and repeats steps 5T12 to 5T11a until the above-mentioned processing is completed for all the divided areas. Execute.

When this process is completed, the tit control section 31 returns to step 5T15 of the main flowchart 1.

Further, in step ST3, if the operator instructs to create a window screen file by utilizing the original data such as mount data, the control unit 31 skips this routine and returns to step STI5 of the main flowchart. Return to

Then, in step 5T15, the control section 31 checks whether the reference printed circuit board 10-1 is set on the X-Y table 19, and if it is set, controls the X-Y table section 14. The imaging unit 15 is caused to image the first divided area of the reference print 10-1, the image signal obtained thereby is converted into image Q data by the A/D conversion unit 23, and this image data is then converted into image Q data. It is supplied to the image processing section 26 and binarized.

Next, the control unit 31 performs the above 2 Ia in step 5T16.
Step 5: A copper foil pattern image is extracted from the binarized image data obtained by the conversion process, and this is stored in the teaching table 25 as a positioning reference pattern.
At T17, the window modification routine 36 shown in FIG. 3(C) is called, and at step 5T1B of this routine, the image data (image data of the reference printed circuit board 10-1) is
At the same time, the window screen file is read from the teaching table 25 and is supplied to the CR7 display 28.

In this case, the image of the reference printed circuit board 10-1 includes not only the component 13a but also other copper foil patterns, etc., as shown in FIG. 5(A). Also, the window screen is the fifth
As shown in Figure (B), it includes only a window 37,
Each of these screens is displayed on the CR1 display 28 in an overlapping manner.

Next, in step 5T19, the control unit 31 changes the color of the first window among the windows 37 on the screen to notify the operator that this window is currently the subject of processing.

Here, if this operator judges that there is no need to correct this first window while looking at both sides and presses the NEX key 42 on the keyboard 30, the control unit 31 detects this in step 5T20 and corrects the first window. Step 5T20 branches to step 5T21, where the color of the first window is restored to its original color, and then the processing window designation is incremented to change the color of the next window (in this case, the second window).

If the operator presses the removal key 40 on the keyboard 30, the control unit 31 detects this in step 5T22, determines that this window is a window caused by noise, etc., and then steps 5T22 to 5T23 Branch to. Then, the control unit 31 removes this window in step 5T23.

Also, if the operator presses the modification key 43 of the window on the kill board 30, the control unit 31 detects this in step 5T24 and determines that it is necessary to modify this window, and steps from step 5T24 to Branch to 5T25.

In step 5T25, the control unit 31 modifies the portion of this window specified by each of the arrow keys 448 to 44d in the direction specified by each of these arrow keys 44a to 44d and the modification key 39.

If the operator presses the add key 41 on the keyboard 30, the control unit 31 detects this in step 5T26, determines that it is necessary to add a window, and proceeds from step ST26 to step 5T27. Branch out.

Then, in step 5T27, the control unit 31 creates a new window in the area designated by each of the arrow keys 44a to 44d, and executes the window modification process described above on this window.

After this, the window correction process for all the part images displayed on the screen is completed, and the operator presses the keyboard 3.
0, the control unit 31 detects this in step 5T2B, stores the corrected window screen file obtained by the correction operation described above in the teaching table 25, and then executes this routine. The process ends and returns to step 5T29 of the main flowchart A7.

Then, in this step 5T29, the control section 31 checks whether the processing of all the divided areas on the reference printed circuit board 10-1 has been completed, and if there remains a divided area for which the processing has not been completed, this Step 5T
From step 29, the process returns to step 5T15, and the process described above is executed for the remaining divided areas.

Then, when processing is completed for all divided areas,
The control unit 31 performs steps 5T29 to 5T30.
Here, the window screen files for each divided area stored in the teaching table 25 are displayed all at once (or sequentially) and the operator is instructed to reprocess the window screen files (for example, modify the window, etc.). Ask if any processing (deleting, adding, etc.) is necessary.

Now, if the operator enters that at least one of each window screen file needs to be reprocessed,
The total 11 units 31 return from step 5T30 to step 5T15 and execute the above-described process again for the divided area that requires reprocessing.

If the operator inputs that reprocessing is not necessary at step 5T30, the control section 31 branches from step 5T30 to step 5T31, where X-
The Y table section 14 is set to 1tIII til L, the positive image section 15 is set to 19 the first divided area of the reference printed circuit board 10-1, and the image stock signal obtained thereby is converted into image data by the A/D conversion section 23. After that, this image data is supplied to the image processing section 26 to be converted into two images.

Next, in step 5T32, the control unit 31 extracts a copper foil pattern (measurement pattern) from the binarized image data obtained by the binarization process, and stores the address and the measurement pattern of this measurement pattern in the teaching table 25. The address of each pixel constituting the binary image data is shifted so that the address of the reference pattern matches, and each window position l of the window double-sided file stored in the teaching table 25 and the binary value are Match each part in the converted image data.

When this process is finished, the control section 31 performs step 5T3.
In step 3, each part image is cut out from the binarized video recording using each window of the window screen file, and
From these component images, reference printed circuit board 10-
The characteristic parameters of each component 13a in the first divided area of 1]- are extracted.

In this case, the brightness, saturation, hue, etc. of the component are used as the characteristic parameters.

Next, the control unit 31 files each of these feature parameters in the teaching table 25 in step 5T34, and files the printed circuit board 10 in the group 11 in step 5T35.
Check whether the above-mentioned processing has been completed for all divided areas of -1, and if there are 11 areas remaining for which processing has not been completed yet, this step 5T3
5 returns to step ST31 and executes the upper 5i Ll process on the remaining divided areas.

Further, when inspecting the board to be inspected 10-2 which is seated with claws in the same manner as the reference printed circuit board 10-1, the control section 31 first initializes each part of the circuit in step 5T40 of the inspection flowchart shown in FIG. to put them into inspection mode.

Thereafter, when the printed circuit board 10-2 to be inspected is set on the X-Y table section 14 by an operator or the like, the control section 31 controls the X-Y table section 14 to set the printed circuit board 10-2 on the IS section 15 in step ST41. Inspection printed circuit board 10-
2 is imaged, the image signal obtained at this time is converted into image data by the A/D converter 23, and then this image data is supplied to the image processor 26 and binarized. .

Next, in step 5T42, the control unit 31 executes a position correction process on the image data to determine the position of each component in the binarized image of the reference printed circuit board 10-1 and the position stored in the teaching table 25. Match each window position of the window screen file completely.

Thereafter, in step 5T43, the control unit 31 cuts out each component image from the binarized image of the printed circuit board 10-2 to be inspected using each window of the window screen file, and also cuts out each component image from the binary image of the printed circuit board 10-2 to be inspected from each of these component images. Each component 13b on the first divided area of the printed circuit board 10-2
Extract the feature parameters of.

In this case, the same feature parameters used in Deeding are used.

Next, in step 5T44, the control unit 31 compares the characteristic parameters of the printed circuit board 10-2 to be inspected with the characteristic parameters of the printed circuit board 10-1 to be inspected stored in the teaching table 25 to determine the printed circuit board to be inspected. After determining whether all the components 13b are mounted in each component placement area on the board 10-2 without any displacement, the determination results are stored in the memory 2 in step 5T45.
4 to be memorized.

Thereafter, the control section 31 displays the determination result on the CRT display 28 and prints it out from the printer 29 in step 5T46.

Next, in step 5T47, the control unit 31 checks whether the above-mentioned processing has been completed for all the divided areas of the printed circuit board 10-2 to be inspected, and if the processing has not been completed yet, the υ1 area is blanked. If so, the process returns from step 5T47 to step 41, and the above-described process is executed for the remaining divided areas.

In this way, in this embodiment, the window screen file created using the teaching board 32 etc. can be corrected later, so even if the teaching board 32 is roughly created, it is possible to create an accurate window screen file. You can get image files.

Furthermore, in the embodiment described above, the teaching board 3
As for 2, the base plate is painted black and the parts are painted white, but the parts are mounted on the base board whose entire surface is coated with an ultraviolet-excited fluorescent agent or a daylight-excited fluorescent agent.
It is also possible to use a thorn.

Further, in the embodiment described above, each printed circuit board 10-
1.10-2 is imaged and the feature parameters of each component are extracted from the binarized image data 1':i, but before imaging each of these printed circuit boards 10-1. , IIS imaged the B It board in advance, and while referring to the binarized image average data of this bare board, the characteristic parameters of each part were determined from the binarized image data of each printed U board 10-1 and 10-2. It may be extracted.

Further, the present invention is not limited to the above-mentioned printed circuit board inspection device, but can also be applied to a mounter and the like.

(Effects of the Invention) As explained above, according to the present invention, a window screen file etc. created based on a teaching board etc.
Since it can be corrected later, an accurate window screen file can always be obtained even if the teaching board or the like is roughly created.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a printed circuit board inspection apparatus to which an embodiment of the printed circuit board processing neck according to the present invention is applied, FIG. 2 is a plan view showing an example of a keyboard used in the same embodiment, and FIG. Figures (A) to (C) are flowcharts showing an example of the teaching operation in the same embodiment, Figure 4 is a flowchart showing an example of the inspection operation in the same embodiment, and Figure 5 (A
). (B) is a schematic diagram showing screen examples of the same embodiment, and FIG. 6 is a block diagram showing an example of a conventional automatic inspection apparatus for printed circuit boards. 10-1, 10-2... printed circuit board, 13a. 13b... Parts, 25... Parts information storage unit (teaching table), 30... Input unit (keyboard),
31...control unit, 32...teaching board. Figure 3

Claims (1)

[Claims] A printed circuit board processing apparatus that processes printed circuit boards includes a component information storage section that stores component information input in advance, an input section for inputting component correction information, and component information input from this input section. a control section that corrects component information stored in the component information storage section based on the component information storage section.