JPH02236682A - Automatic inspection device - Google Patents

Abstract

PURPOSE:To attain secondary inspection by means of re-photographing even when a checking time is shortened, and to obtain a high deciding accuracy by executing the quality inspection and decision of a object to be checked in parallel with the movement of a photographing viewpoint. CONSTITUTION:A defective part number obtained by a primary inspection is stored into a storage 13, the defective part number is applied to an X-Y table controller 5 as an inspection part number I, the defective part is photographed by a television camera again, and thus the secondary inspection is attained. Further before the output of an inspected and decided result from a picture processor 9, the photographing viewpoint is moved. Thus even when the inspection time is shortened, the secondary inspection is attained, and the high deciding accuracy can be obtained.

Description

[Detailed Description of the Invention] [Object of the Invention] [Industrial Application Field] The present invention relates to an automatic inspection device, and in particular, an automatic inspection device suitable for determining the quality of the mounting state of electronic components on an In-Liu wiring board. Regarding.

《Conventional technology》 Recently, printed wiring boards have been used in various electronic devices.

In this printed wiring board, electronic components such as resistors and capacitors are mounted on the board by using automatic machines such as an automatic board insertion machine and an automatic mounting machine. The mounted state of electronic components is photographed by a television camera, and the image is processed by a computer to determine its quality.

FIG. 3 is a block diagram showing a conventional automatic inspection device that can automatically determine the quality of the mounting state of such electronic components, and FIG. 4 is a flowchart for explaining its operation. .

First, the object to be inspected (printed wiring board with electronic components mounted) 1
is placed on the X-Y table 2. A television camera 3 fixed above the X-Y table 2 shows the mounting state of electronic components on the printed wiring board 1. The image resolution is determined by the magnification of the optical lens 4 attached to the television camera 3, and if the magnification of the optical lens 4 is increased to improve the image resolution, &! ! 1? The JA field becomes narrower.

Therefore, when it is necessary to inspect a relatively wide inspection range and minute parts, such as when inspecting the mounting state of electronic components on the printed wiring board 1, an optical lens 4 with a large magnification is used. By moving the projection viewpoint of the television camera 3, the entire area of the printed wiring board 1 is viewed.

In FIG. 3, the X-Y table 2 is moved to sequentially repel images of each part of the printed wiring board 1.

The movement of the X-Y table 2 is controlled by an X-Y table control device 5, and the X-Y table control device 5 is controlled by a main control device 6.

In step S1 of FIG. 4, the main controller 6 initializes to 1 an inspection site number I indicating a site (inspection site) of the printed wiring board 1 to be inspected.

Next, in step S2, the main controller 2t gives data indicating the inspection site number 1 to the X-Y table control %A position 5, and the X-Y table control device 5 sends data indicating the inspection site number 1 ( The X-Y table 2 is moved so that the inspection site 1 (hereinafter referred to as the inspection site 1) is within the field of view of the television camera 3. In step S3, it is determined whether or not the movement of the X-Y table 2 has been completed, and if it has been completed, the process moves to step $4. In step S4, the television camera 3 photographs the inspection site 1 of the printed wiring board 1, and outputs the resulting image to the A/D conversion circuit 7. The A/D conversion circuit 7 converts the image signal into a digital signal and supplies it to the frame memory 8, and the frame memory 8 stores the image data.

The image data stored in the frame memory 8 is subjected to image processing in an image processing device 9 to determine whether the mounting state of the potential components is good or bad. By the way, as described above, since the image resolution is improved, the field of view is narrow, and the number of times the viewpoint of the shadow region is changed (the number of times the X-Y table 2 is moved) is relatively large. Therefore, the time required to move the X-Y table 2 is long, and the inspection requires a long time. Therefore, in the apparatus shown in FIG. 3, immediately after the frame memory 8 stores the image data, the image processing device 9 processes the Ilil shadow image and moves the X-Y table 2 corresponding to the next examination region at the same time. We are trying to shorten the operating time by doing so.

That is, in step S5, the main controller 6
Image processing system F! 19 is instructed to start inspecting the mounting state of the electronic components in the inspection area 1. Next, in step S6, it is determined whether the inspection site number 1 indicates the final inspection site, and if it is not the final inspection site, the data of the inspection site number 2 (-1+1) is transferred to the 5 to start moving the XY table 2. A series of processes from Steps 85 to S7 are performed almost simultaneously, including the determination of whether or not this is the final inspection site in Step S6 and the movement of the X-Y table 2 in response to the command to start moving the X-Y table 2 in Step S7. In parallel with the operation, the image processing device 9 processes the image data from the frame memory 8 under the control of the main controller @6, and inspects and determines the mounting state of the electronic components.

The end of the test is determined in step S8. The inspection judgment result of the inspection site 1 is given from the image processing unit 9 to the main control device M6, and if the inspection judgment result indicates a defect in step S9, the main control device 6 sends the result to the printer 10 in step S810. Print the judgment results. Next, in step Sit, it is determined whether or not the inspection site number I is the final inspection site number R. If it is the final inspection site number fl, the process is terminated, and if it is not the final inspection site number, the inspection site number is 1 is added to the number ■ and the process moves to step S3. In step S3, X-
It is determined whether or not the movement of Y table 2 has been completed, and X-
If the Y table 2 has moved to the position corresponding to the inspection site number 2, the process advances to step S4. Thereafter, similar operations are repeated to inspect and determine the quality of all parts of the printed wiring board 1. In this way, in the apparatus shown in FIG.
The operation time is shortened by performing the quality inspection and the movement of the X-Y table 2 in parallel.

By the way, depending on the judgment result of the pass/fail inspection judgment, the judgment accuracy may be improved by re-photographing the same part and performing a secondary inspection (re-examination) in the image processing device 9. However, the inspection judgment operation by the image processing device 9 and the
The moving operation of the Y table 2 is processed in parallel, and at the time the inspection judgment result is output from the image processing device 9,
There is a problem in that the movement of the X-Y table 2 has already started, and it is not possible to re-image the same area for a secondary examination.

(Problem to be solved by the invention) As described above, in the conventional automatic inspection device described above,
Since the inspection judgment of the quality of the inspected object by the image processing system@9 and the movement of the dancing viewpoint are performed in parallel, it is not possible to re-inspect the same part and perform a secondary inspection, which reduces the accuracy of the inspection. There was a problem that it was not possible to improve.

The present invention has been made in view of such problems, and includes:
Even when the inspection time is shortened by performing the pass/fail inspection judgment of the inspected object and the movement of the photographing viewpoint in parallel, high judgment accuracy can be obtained by making the secondary inspection by re-imaging possible. The purpose is to provide an automatic inspection device that can perform

[Structure of the Invention] (Means for Solving the Problems) An automatic inspection device according to the present invention includes a table on which an object to be inspected is attached, and a television camera that images each part of the object to be inspected and outputs an image signal. and a withdrawal viewpoint moving means for moving at least one of the table and the television camera so that each part of the object to be inspected enters the R shadow field of view of the television camera, so that all parts of the object to be inspected can be shadowed. , an image processing device that inspects and determines the quality of each part of the object to be inspected by performing image processing on image data obtained from the image signal; and an image processing device that inspects and determines the quality of each part of the object to be inspected; A storage device for storing data, and a storage device that enables parallel operations of moving the imaging viewpoint and determining the quality of each part of the inspection object by directly controlling the photographing viewpoint moving means and the image processing device; A main illumination system that enables re-inspection of parts determined to be defective based on data stored in
It is equipped with l equipment.

(Function) In the present invention, the main 1tll control device controls the photographing viewpoint moving means to move at least one of the table and the television camera so that each part of the object to be inspected is within the photographic field of view of the television camera. The television camera photographs each part of the object to be inspected, and the image processing device inspects and determines the quality of each part of the object based on the image signal from the television camera. Here, the main control TM device controls the photographing viewpoint moving means υ1 to move the transport viewpoint during the inspection and determination operation of each part of the image processing device, thereby shortening the inspection time.

Data indicating the portion determined to be defective by the image processing device is stored in the storage device. The main controller reads data from the storage device and moves m shadow viewpoints based on this data. As a result, the portion determined to be defective is imaged again by the television camera, and the image processing device performs the inspection and re-examination.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. FIG. 1 is a block diagram showing an embodiment of an automatic inspection device according to the present invention. Components in FIG. 1 that are the same as those in FIG. 3 are given the same reference numerals.

The X-Y table 2 is provided on the horizontal surface of the fixed base 11, and is movable in the X and Y directions by being driven by an appropriate drive member (not shown). An object 1 to be inspected, such as a printed wiring board on which electronic components are mounted, is placed on this XY table 2. A television camera 3 is supported by a suitable support member above the X-Y table 2 and is fixed with an optical lens 4 facing the X-Y table 2 side.

The optical lens 4 has a relatively large magnification, and the TV camera 3
is capable of projecting only a part of the object 1 to be inspected.

The object to be inspected 1 is inspected for each part based on the field of view of the television camera 3, and the part to be inspected (inspection part) is designated by an inspection part number I.

The movement of the X-Y table 2 is controlled by an X-Y table control device @5. That is, the X-Y table control device 5 is controlled by the data of the inspection site number I from the main control device 1ii12, and moves the The movement of the Y table 2 is controlled.

By this movement of the XY table 2, all parts of the object 1 to be inspected can be carried by the television camera 3.

The television camera 3 images the object 1 to be inspected and converts the image signal into Δ/
The signal is output to the D conversion circuit 7. The A/D conversion circuit 7 A/D converts the image signal to obtain image data, and supplies this image data to the frame memory 8. Frame memory 8 is master 61
! It is controlled by the device 12 to store the image data from the Δ/D conversion circuit 7 and to provide the stored image data to the image processing device 9. The image processing device 9 is controlled by the main control device 12 and reads image data from the frame memory 8 and performs image processing on the object to be inspected 1.
For example, the quality of the electronic components mounted on the printed wiring board is inspected and judged, and the inspection and judgment results are sent to the main controller 12.
It is designed to be given to The printer 10 is provided with inspection and determination results from the main control device 12, and is configured to print the inspection and determination results for parts that are determined to be defective based on the inspection and determination results (hereinafter referred to as defective parts).

In this embodiment, a storage device 13 is provided.

The storage device 13 is constituted by a one-dimensional array, and is configured to receive data of a defective part number indicating a defective part from the main controller 12 and to store this data.

Next, the operation of the automatic inspection apparatus configured as described above will be explained with reference to the flowchart shown in FIG. The area surrounded by the broken line A in FIG. 2 shows the primary inspection, and the area surrounded by the broken line B shows the secondary inspection. In FIG. 2, the same steps as those in FIG. 4 are given the same reference numerals.

First, an object to be inspected 1 such as a printed wiring board on which electronic components are mounted
is placed on the X-Y table 2. The main controller 12 is
In step S13, a count value N indicating the number of parts determined to be defective in the primary inspection is initialized to zero. Then,
In step S1, the inspection site number I is initialized to 1,
In step S2, the X-Y table 2 is moved. The main controller 12 sends data indicating the inspection site number 1 to the X-Y table control device 5, and the X-Y table v1 control device 5 controls the - Move the Y table 2. X in step S3
- When it is determined that the movement of Y table 2 has been completed,
The process moves to step S4. In the next step S4, the image signal from the television camera 3 is applied to the A/D conversion circuit 7, A/D converted, and stored in the frame memory 8 according to instructions from the main υJilt device 12.

Next, in step S5, the main controller 12 instructs the image processing device 9 to start the primary inspection.

Almost simultaneously with this instruction, the main controller 12 performs step S6.
It is determined whether the inspection site number ■ indicates the final inspection site, and if it does not indicate the final inspection site, in the next step S7, - Instruct the movement of the Y table 2. Therefore, the primary inspection by the image processing device 9 and the movement of the X-Y table 2 by the X-Y table control device 5 are performed in parallel, and the inspection time can be shortened.

The image processing device M9 performs image processing on the image data read out from the frame memory 8, and inspects the transported inspection site with the television camera 3 to determine whether it is good or bad.

In step S8, the main controller 12 is in a standby state,
When the image processing device 9 provides the inspection determination result to the main control device 12, the process moves to step S9.

In the next step S9, the main control device 12 moves the process to step 811 if the inspection judgment result shows that the result is good, and if it shows that it is bad, the main control device 12 moves to step 811. In step 814, 1 is added to the count value N.

Next, in step S15, the main control system 12 stores data indicating the inspection part number I in the Nth area of the storage device @13 as data of the defective part number.

In the next step S111, it is determined whether inspection site number 1 1 indicates the final inspection site, and if it is not the final inspection site, 1 is added to the inspection site number I at step 312, and the process is continued at step S3. to move to. Step S3
Then, it is determined whether the movement of the X-Y table 2 in step S7 has been completed. Thereafter, in the same manner, all parts of the inspection object 1 are photographed and subjected to a primary inspection to determine whether the inspection object is good or bad. Note that the count (iflN) indicates the number of defective parts in the primary inspection, and the storage device 13 stores data of defective part numbers.

If it is determined in step S11 that the inspection site number I indicates the final inspection site, the process moves to step 316 for a secondary inspection. In the secondary inspection, first, step 31
At B, the count value J of the execution counter is initialized to 1. The execution counter counts up each time a secondary inspection of a defective part is performed.

In the next step S17, it is determined whether the count value J is larger than the count value N. This determines whether there are any remaining defective parts that should be inspected, and N<J
In this case, that is, if there are no defective parts left to undergo secondary inspection, the process moves to step 827 and ends the process. On the other hand, if N is equal to or greater than 1 in step 814, the process moves to step 818.

In step 818, the main controller 12 reads the part number (defective part number) of the part determined to be defective in the temporary inspection from the J(-1)th area of the storage device 13, and uses this data in the secondary inspection. X- as data of inspection site number I
It is given to the Y table control device 5. As a result, the X-Y table control device 5 controls the inspection object 1 in the next step 819.
The X-Y table 2 is moved so that the inspection site I is within the visual field of the television camera 3. In the next step 820, it is determined whether or not the movement of the X-Y table 2 has been completed.
If the inspection is completed, the television camera 3 photographs the inspection site (2) in the next step 821 and provides an image signal to the A/D conversion circuit 7. The A/D conversion circuit 7 A/D converts the image signal and supplies it to the frame memory 8, and the frame memory 8 stores the image data.

Next, in step 822, the main controller Il12 instructs the image processing device 9 to start the secondary inspection. The image processing device 9 reads image data from the frame memory 8, processes the image, inspects it, and determines whether the inspected object 1 is good or bad. In addition,
The secondary inspection may be the same process as the image processing of the primary inspection. In the next step $23, the main controller 12:
By receiving the inspection determination result of the secondary inspection from the image processing device 9, it is determined that the secondary inspection by the image processing device 9 has been completed, and the process moves to step S24. In step 824, if the inspection determination result of the secondary inspection indicates a defect, that is, if this inspection part is determined to be defective in the primary and secondary inspections, the main controller 1
Step 2 causes the printer 10 to print the inspection and determination results, and the process moves to step 826. On the other hand, if the inspection judgment result of the secondary inspection shows that it is good, step 8
The process proceeds to step 82G without passing through step 25.

In step 326, 1 is added to the count iflJ-1, and the process returns to step 817. Here, if N is 2 or more, that is, if there are 2 or more defective parts in the primary inspection, the process moves from step 817 to step 818, and the above-described process is repeated. That is, in step 817, it is determined whether the secondary inspection has been performed on all parts that were determined to be defective in the primary inspection. If N<J(-2), the process ends at step 827.

As described above, in this embodiment, the defective part number obtained in the primary inspection is stored in the storage device 13, and this defective part number is given to the X-Y table control device 5 as the inspection part number 1, so that the defective part can be checked again on the TV. By taking pictures with a camera,
A secondary inspection is possible. Therefore, even if the inspection time is shortened by moving the imaging viewpoint prior to the output of the inspection judgment result from the image processing device 40, a secondary inspection is possible and a high judgment result can be achieved. Accuracy can be obtained.

[Effects of the Invention] As explained above, according to the present invention, the inspection time can be shortened and secondary inspection can be performed.
This has the effect that high determination accuracy can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an automatic inspection device according to the present invention, FIG. 2 is a flowchart for explaining the operation of the embodiment, and FIG. 3 is a block diagram showing a conventional automatic inspection device. FIG. 4 is a flowchart for explaining the operation of the conventional example. 1...Object to be inspected, 2...X-Y table, 3...
TV camera, 5...X-Y table control system, 7.
...A/D conversion circuit, 8...Frame memory, 9...
- Image processing device, 12... Main control device, 13... Storage device.

Claims (1)

[Scope of Claims] A table on which an object to be inspected is mounted; a television camera that photographs each part of the object to be inspected and outputs an image signal; photographing viewpoint moving means for moving at least one of the table and the television camera to photograph all parts of the object to be inspected; an image processing device that inspects and determines the quality of a part; a storage device that stores data indicating a part determined to be defective by the image processing device; and a storage device that controls the photographing viewpoint moving means and the image processing device to perform the photographing. a main control device that enables parallel operations of movement of a viewpoint and inspection determination of pass/fail of each part of the object to be inspected, and also enables re-inspection of parts determined to be defective based on data stored in the storage device; An automatic inspection device characterized by comprising: