JP3227365B2 - Appearance inspection method and apparatus for printed board unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for inspecting the appearance of a printed circuit board unit, and more particularly to a method and an apparatus for inspecting an SMT printed circuit board unit for defective production such as defective component mounting or defective soldering.

Generally, a printed circuit board unit is often subjected to component mounting and soldering processing automatically by a machine, so that a mounting defect or a soldering defect may occur. And equipment is needed.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for inspecting a manufacturing defect such as a component mounting defect or a soldering defect of an SMT printed circuit board unit, an external shape of an inspection target is detected by an optical means such as a television camera, and an experiment is performed in advance. An automatic visual inspection machine that detects a defective state by comparing it with a non-defective state set by a non-defective product, etc., and electrically measures the constants and continuity of mounted components, and determines a non-defective value determined in advance through experiments and the like There is an in-circuit tester (hereinafter sometimes abbreviated as ICT) that detects a defect by comparison.

[0003]

Among them, the automatic appearance inspection machine is a machine which is obtained by mechanizing a visual sensory inspection.
A determination result that does not match the visual inspection result occurs.

FIG. 13 shows an example of the determination of the soldering state of an IC (integrated circuit) lead. The image taken by the camera is shown in FIG. 2B, which is the image taken by the television camera of the top surface of the normal joint (FIG. 3C) when the amount of solder is large. Similar to ((4) in FIG. 4), the appearance inspection machine determines that the normal bonding state ((4) in FIG. 4) is also defective in order not to overlook the defect.

[0005] As described above, in general, many defective products can be included in the defect judgment of the automatic appearance inspection machine. Therefore, the defect judgment places by the automatic appearance inspection are determined by the automatic appearance inspection machine 20 as shown in FIG. The conventional method (1), in which the inspection result contents 202 are obtained by visually re-inspection (verification) based on the printer output result 201 of the above (1), and the data storage file of the automatic appearance inspection machine 20 as shown in FIG. 2
A conventional method in which the XY stage is moved using the inspection result (defective) data stored in the storage unit 03 and the visual inspection support device with an XY stage 204, and the defect determination portion displayed in an enlarged manner is visually inspected again to complement and correct it. (2) is adopted.

[0006] When there are many defective judgment points by the automatic appearance inspection as described above, a large number of steps are required for re-inspection, and the advantage of employing the automatic inspection is diminished.

On the other hand, the above-mentioned in-circuit tester is also an effective means for electrically detecting a manufacturing defect, but it is difficult to probe with a dedicated fixture in a miniaturized / high-density surface mount printed circuit board unit. , And the application rate is decreasing.

[0008] A fixtureless type in-circuit tester using a movable (flying) probe is also commercially available, but has a drawback that it is not suitable for mass-produced products due to the long test time.

Further, devices having an automatic appearance inspection function in the in-circuit test have already been provided on the market. However, these devices share inspection items and execute inspections. It does not automatically re-examine the location.

Therefore, the present invention is to improve the automation rate of printed circuit board unit inspection by automating visual re-inspection (verification) by combining an automatic appearance inspection machine and a moving probe type in-circuit tester. An object of the present invention is to realize a method and an apparatus for inspecting the appearance of a plate unit.

[0011]

[Means for Solving the Problems]

[1] In order to achieve the above object, in the method for inspecting the appearance of a printed circuit board unit according to the present invention, the appearance of a printed circuit board unit to be inspected is inspected by an appearance inspection machine in accordance with test data for appearance inspection to generate defect detection data. Generating test data for automatic verification by extracting only test data having the same part number as the part number in the failure detection data in the test data for the in-circuit tester, and connecting the inspection target printed circuit board unit to the test data for automatic verification. The component is re-inspected by a moving probe type in-circuit tester, and the final failure judgment result is output by comparing the re-inspection data with the test data for automatic verification.

That is, according to the method of the present invention, a defect is detected by a visual inspection machine in accordance with test data.

[0013] Then, the defective inspection portion is inspected by a moving probe type in-circuit tester (ICT) by an appearance inspection machine, thereby automating re-inspection (verification) of the defective portion.

In this case, the moving probe type in-circuit tester performs the inspection in accordance with the procedure of the test data, and in the present invention, the part number in the defect data of the inspection result is used as a key to specify the test data. Only the part number data is extracted, and only the parts that have failed in the appearance inspection are tested.

The inspection result is output to a failure result detection storage file or a printer as a final failure determination result.

[2] In the above [1], before the test data for automatic verification is generated, the defect detection data is compared with the defect code to be verified for the in-circuit tester to separate the visual inspection data in advance. In addition, it is also possible to perform a visual inspection using the visual inspection data using a visual assistance device and combine the inspection result with the final failure determination result.

[3] Further, in the appearance inspection apparatus for a printed board unit according to the present invention used for carrying out the above-described method of the present invention, the printed board unit to be inspected is subjected to appearance inspection test data stored in a file in advance. Appearance inspection machine for inspecting appearance and generating defect detection data, and automatic verification for extracting only test data with the same part number as the part number in the defect detection data in the test data for the in-circuit tester stored in a file in advance A data processing unit for generating test data; retesting the inspected printed circuit board unit with respect to the components of the test data for automatic verification; comparing the retest data with the test data for automatic verification to determine the final failure; A moving probe-type in-circuit tester that outputs a determination result. To have.

That is, in the apparatus of the present invention, the printed circuit board unit to be inspected is subjected to defect detection by the appearance inspection machine according to the test data stored in the file in advance, and the result is stored in the inspection result file.

According to the present invention, the defect determination portion of the visual inspection machine is inspected by a moving probe type in-circuit tester. The mobile probe type in-circuit tester performs the test according to the procedure of the test data stored in the test data file.

The data processing section of the present invention extracts only the data of the specific part number in the test data which is the same as the part number in the failure data of the inspection result file, and verifies only the parts which failed in the appearance inspection. A circuit that constitutes test data is added. The in-circuit tester performs an inspection according to the test data. The inspection result is output to a failure result detection storage file or a printer as a final failure determination result.

[4] In the above [3], the data processing unit reads a part number from the failure detection data and stores the data, and a part number and a part number based on the in-circuit tester test data. A second data reading register for reading and storing the test parameter, a comparator for comparing the part numbers in the data stored in both registers and detecting only a matching part number,
A data write register for storing the matching part number detected by the comparator and its test parameter and outputting the same as the automatic verification test data can be provided.

[5] Further, in the above [3], the data processing section compares the defect detection data with the in-circuit tester verification target defect determination data stored in the file in advance to store the visual inspection data in advance. Including an inspection result classification unit for performing classification, the visual inspection device performs a visual inspection using the visual inspection data, and the data processing unit can combine the visual inspection result with the final failure determination result.

[6] Further, in the above [5], the inspection result discriminating circuit includes a data reading register for reading and storing a defect code that can be tested by the in-circuit tester, and a part number, a defect code, and a position coordinate. A data register configured to read and store the failure determination data, a switch unit that compares the failure determination data of each register, and performs a switching operation according to the result, A data write register that outputs the result of the determination of the defect to be verified and the result of the determination of the defect to be visually verified can be provided.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of an automatic appearance inspection apparatus having an automatic verifying function for carrying out a method for inspecting the appearance of a printed circuit board unit according to the present invention. A television camera 2 for moving the unit 1 and the upper part of the printed board unit 1 to image components and solder and moving probes 3 to 5 for contacting component electrodes of the printed board unit 1 and inputting and outputting electric signals are prepared. .

Further, a data file 11 which is a set file of various files, a data processing unit 12 for transferring test data and inspection results and data processing, and an XY for controlling the movement of the television camera 2 and the probes 3 to 5 A table control unit 13, an appearance inspection execution unit 14 including an image processing unit 14 a and a determination unit 14 b, which processes an image captured by the television camera 2 to execute inspection and determine pass / fail;
a, probes 3 to 3 including a measuring unit 15b and a determining unit 15c
And an in-circuit test execution unit 15 that performs switching of the electrical signal input / output via the input / output 5, measurement, and quality judgment.

The data file 11 includes (1) a test data file for appearance inspection prepared in advance based on experiments and the like for inspecting the appearance of components on the printed circuit board unit 1 and the soldered portions of the components. 2) It is composed of an ICT test data file created in advance for performing the in-circuit test on the same part as the part to be inspected, and (3) the defect determination contents (defective part number, defect code, position coordinates) of the appearance inspection. Visual inspection result (data) file
(4) Test data file for automatic verification created based on the appearance inspection result and test data for ICT, and (5) IC
And a final judgment result (data) file composed of the contents of the defect judgment after the inspection at T.

The television camera 2 and the appearance inspection execution unit 1
4 together form an automatic visual inspection machine.

The operation of this embodiment will be described with reference to FIG.
When the printed board unit 1 to be inspected is set, the corresponding test data 11 for appearance inspection in the data file 11 are set.
1 is loaded (a) into the appearance inspection execution unit 14. The appearance inspection execution unit 14 included in the automatic appearance inspection machine 20 includes a test data file 111 for appearance inspection in the data file 11.
The TV camera 2 is moved in accordance with the test data of (1), the mounted part and the soldered part are imaged, a comparison is made with the non-defective state based on the imaged image data and the test parameters (contents), and the content of the defect is output as the appearance inspection result File 1
12 (b). Up to this point, it is the same as the conventional automatic appearance inspection machine.

Next, the ICT test data file 11
3 using the relevant ICT test data stored in advance and the above-mentioned appearance inspection results, the automatic verification test data for performing an in-circuit test only on the parts determined to be defective in the appearance inspection. It is created by the creating unit 22 and stored in the data file 114 (c).

That is, in this embodiment, the test data file 113 is used as the key to the part type number (hereinafter referred to as the part number) in the defect data of the inspection result file 112.
Only the data of the specific part number in the data is extracted, and verification test data for testing only the part number which is defective in the appearance inspection is generated.

The test data for automatic verification is loaded into the in-circuit test execution unit 15, and only the parts determined to be defective by the appearance inspection are probed by the moving probe ICT 30 in accordance with the procedure of the test data stored in the test data file 114. Perform an in-circuit test.

The test result is stored in the data file 115 as a final judgment result and is output (d) as a defect detection result storage print 23 for visual inspection.

FIG. 3 shows an embodiment of the automatic verify test data creating section 22 shown in FIG. 2. In this embodiment, three register sections 221 to 223 and a comparator 22 are provided.
4 is included.

Schematically, first, the data read register section 221 reads the part number data of the address indicated by the address counter AC1 from the appearance inspection result file 112 and stores it in the register R1.

The data read register 222 reads out the part number data and the test parameter data (contents) of the address indicated by the address counter AC2 from the ICT test data file 113 and stores them in the registers R2-1 and R2-2, respectively. Store.

The comparator 224 compares the part number data stored in the register R1 with the part number data stored in the register R2-1. If the data does not match,
The address counter AC2 is counted up, and the part number data indicated by the next address is read from the ICT test data file 113. If the data match, the part number data and the test parameter data stored in the registers R2-1 and R2-2 pass through the data write register unit 223, and pass through the automatic verification test data file 114 indicated by the address counter AC3. Is stored in

The address counter AC1 of the data read register 221 is counted up, and the address counter AC2 of the data read register 222 is reset. Thereafter, the same operation is repeated.

FIG. 4 is a flow chart of a process for generating test data for automatic verification, and shows the appearance inspection result file 112 and the ICT test data file 1.
13 shows a processing flow in the case where a termination code is provided at the end of data No. 13.

First, an initial value is set in the address counter AC1 (A1 ← a1) (step S1), an initial value is set in the address counter AC3 (A3 ← a3) (step S2), and the appearance inspection result file 112 is set. The part number stored at the address (A1) is set in the register R1 (step S3).

Then, it is determined whether or not the register R1 = termination code (step S4). If “YES”, the process exits the flowchart.
An initial value is set in the address counter AC2 (A2 ←
a2) (Step S5).

Then, the ICT test data file 1
13 is stored in the register R2-1, and the test parameter is stored in the register R2.
-2 (step S6).

Then, it is determined whether or not the register R2-1 = termination code (step S7). If "YES", the flow advances to step S13 to advance to the address counter AC1.
Is incremented by “1”, but if “NO”, it is determined whether or not register R1 = register R2-1 (step S8).

As a result, if "NO", the address counter AC2 is incremented by "1" (step S9), but if "YES", the register R2-1 is incremented.
Is transferred to the register R3-1, and the contents of the register R2-2 are transferred to the register R2-2.
Is transferred to the register R3-2 (step S1).
0).

The contents of the register R3-1 are stored in the part number storage area of the address (A3) of the automatic verification test data file 114, and the contents of the register R3-2 are stored in the test parameter storage area (step S11). ).

The address counters AC3 and AC3
1 is incremented by "1" (steps S12 and S13).

FIG. 5 is a flow chart of a process for creating test data for automatic verification, similarly to FIG. 4. In this case, a process flowchart particularly when an area for storing the number of data is provided at the head of each file is shown. Is shown.

That is, first, the address counter AC1
Is set to the initial value (A1 ← a1) (step S2
0), the initial value is set in the address counter AC2 (A
2 ← a2) (step S21), and set an initial value in the address counter AC3 (A2 ← a2) (step S22).

Next, the number of data (M) stored at the address (a1) of the visual inspection result file 112 is read (step S23), and the ICT test data file 1 is read.
The number of data (N) stored in the address (a2) of No. 13 is read (step S24).

Further, the part number stored in the address (A1) of the visual inspection result file 112 is set in the register R1 (step S25), and the part number stored in the address (A2) of the ICT test data file 113 is stored. The test parameter is stored in the register R2-1.
2-2 are stored (step S26).

Then, register R1 = register R2-1
Is determined (step S27). If “NO”, the subsequent steps S28 to S30 are skipped, but “YE
S ", the contents of the register R2-1 are stored in the register R2-1.
3-1 and transfer the contents of register R2-2 to register R
Transfer to 3-2 (step S28).

Then, the contents of the register R3-1 are stored in the part number storage area of the address (A3) of the automatic verification test data file 114, and the contents of the register R3-2 are stored in the test parameter storage area (step S29). ). Then, the address counter AC3 is incremented by "1" (step S30).

In the above steps S26 to S30, the value of the address counter AC2 is executed from a2 + 1 to a2 + N, and in steps S25 to S30, the address counter AC2 is set.
The value of 1 is executed from a1 + 1 to a1 + N.

The processing flowcharts of FIGS. 4 and 5 can be realized by computer software.

In the case of the above-described embodiment, as shown in FIG. 6, for example, as shown in FIG. 6, even if the component mounting displacement between the footprints 61 and 62 and the chip component 63 becomes poor in appearance, they are still electrically connected. As long as there is a problem, there is a problem that it becomes a good product in the in-circuit test and cannot be detected as a defect.

Therefore, as another embodiment of the present invention, FIG. 7 shows a manufacturing defect detecting apparatus in which a visual support device is added to the combination of the automatic appearance inspection machine and the in-circuit tester of the above embodiment.

This apparatus includes an automatic appearance inspection machine 20 provided with an identification code recognition device 21 for the printed board unit 1 and a printed board unit identification code recognition device for automatically re-inspecting a defective judgment portion of the automatic appearance inspection machine 20. A movable probe in-circuit tester 30 equipped with a printed circuit board 31 and a printed board unit for moving a XY stage to display a defect determination portion of the automatic visual inspection machine 20 on a screen or a field of view of a magnifying glass so that an operator can perform a visual inspection. Identification code recognition device 4
, A file server 50 for storing test data and test results, and a LAN (local area network) 6 for connecting the respective devices.
0.

FIG. 8 is a view for explaining the operation of the present apparatus for detecting a manufacturing defect, FIG. 9 is a data transition diagram, and FIG.
A description will be given based on the operation explanatory diagram of the inspection result sorting unit shown in FIG.

8 differs from the explanatory diagram of the automatic verifying operation shown in FIG. 2 in that a visual inspection support device 40, an inspection result sorting unit 42 and a connecting unit 43 are newly added, and a defect code to be subjected to ICT verification is added. That is, the storage file 116, the inspection result file 117, the visual inspection result file 118, and the defect detection result storage file 119 are newly added to the data file 11 (FIG. 1).

FIG. 9 shows a processing flow when a termination code is provided at the end of the data of the defective code storage file and the appearance inspection result file.

FIG. 10 shows a processing flow in the case where an area for storing the number of data is provided at the head of each file. In the inspection result sorting section 40, the data reading register sections 421 and 422 are provided. A data write register section 423, 424, a comparator 44,
Switches SW1 to SW3 are provided.

First, when the printed board unit 1 to be inspected is set on the automatic appearance inspection machine 20 (step S3 in FIG. 9).
1) The printed board unit 1 in the identification code recognition device 21
Read the identification code attached to (step S3
2) The corresponding test data for visual inspection on the file server 50 is loaded into the test data file 111 (see FIG. 2) automatic visual inspection machine 20 (step S33), and visual inspection is performed (step S34).

The content of the defect is added with an identification code number, and the result of the appearance inspection (see FIG. 10) is stored in the file server 50.
To be stored. As described above, not all of the defective judgment portions of the automatic appearance inspection machine 20 can be re-inspected by the in-circuit tester 30.

Therefore, as a means for determining whether or not the defect determination portion of the automatic appearance inspection machine 20 can be re-inspected by the in-circuit tester 30, a failure code to be subjected to ICT verification is added to the appearance inspection result.

More specifically, as shown in FIG. 10, a defect code of the appearance inspection that can be detected by the in-circuit tester 30 is registered in the file server 50 in advance in the defect code storage file 116, and the registered data and the appearance inspection defect are registered. By inputting the result to the inspection result classification unit 42, the inspection result for automatic verification that can be automatically verified by the in-circuit tester 30 and the inspection result for visual verification that cannot be automatically verified by the in-circuit tester 30 but are visually verified. (The same step S36).

The method of sorting the inspection results will be described in detail with reference to FIG. 10. First, the data read register section 421 reads a defective code in the address indicated by the address counter AC1 from the automatic verification target defective code storage file 116. And store it in the register R1. The data readout register unit 422 reads out the part number, the defect code, and the position coordinate in the address indicated by the address counter AC2 from the appearance inspection result file 112 and stores them in the registers R2-1, R2-2, and R2-3, respectively. Bad code stored in register R1 and register R2-2
Are input to the comparator 44 and compared.

The comparison judgment output from the comparator 44 is given as an open / close control signal to the switches SW1 to SW3. When the data is equal, the switches SW1 to SW3 are connected to the 0-1 side, and the registers R2-1 to R2 are connected. -3 are stored in registers R3-1 to R3-1 in data write register section 423.
Set to 3-3.

That is, the data write register section 4
Reference numeral 23 stores the data in the register in a corresponding part of the inspection result (for automatic verification) file 112 'indicated by the address counter AC3. After storing the data, the address counter AC2 and the address counter AC3 are counted up.

If the data is not equal in the comparator 44, the address counter AC1 is counted up,
The defective code in the address indicated by the address counter AC1 is read and stored in the register R1.

When all the fault codes in the fault code storage file 116 do not match, the switches SW1 to SW3 are all connected to the 0-2 side, and the data read register unit 4
The part number, defect code, and position coordinates stored in
It is set in the data write register 424.

That is, the data write register R4
In -1 to R4-3, data in the register is stored in a corresponding portion of the inspection result (for visual verification) file 117 indicated by the address counter AC4. After storing the data,
The address counter AC2 and the address counter AC4 are counted up.

The above operation is repeated until there is no more data in the visual inspection result file 111.

The automatic verification test result among the automatic verification inspection results and the visual verification inspection results sorted out in this manner is sent to the automatic verification test data creating section 22, and thereafter, in the same manner as described with reference to FIG. An automatic appearance inspection is performed, and an ICT test result file 115 is obtained.

That is, after the appearance inspection is completed as in the prior art, the printed board unit 1 to be inspected is set on the in-circuit tester 30 (step S37). The identification code attached to the printed board unit 1 is read by the identification code recognition device 31 (step S38), and the test data for ICT and the test data to be automatically verified loaded from the file server 50 are generated by the test data creating unit for automatic verification ( 2 (see FIG. 2) to create test data for automatic verification (step S39) and store it in the file server 50.

The in-circuit tester 30 loads the test data for automatic verification (step S40),
Execute an in-circuit test (step S41),
The result is stored in the file server 50 as an in-circuit test result (step S42). In this case, the ICT test result file stored in the file server 50 is as shown in FIG.
Corresponds to the failure detection result storage file 115.

After the end of the in-circuit test (this is also possible before the in-circuit test), the printed circuit board unit 1 to be inspected is set on the visual inspection support device 40 equipped with an automatically moving XY stage and a magnifying glass or a magnifying display device ( Step S43).

The identification code attached to the printed board unit 1 is read by the identification code recognition device 41 (step S44), and the corresponding visual inspection target visual inspection result is loaded from the file server 50 (step S4).
5), the XY table control unit 13 displays the defect determination position while moving the XY stage, and causes the operator to perform the inspection again (step S46).

This inspection result is stored in the file server 50 (file 118) as a visual inspection result (step S47). The result of the in-circuit test and the result of the visual inspection are combined by the combining unit 43 to become a failure detection result of the final version, which is stored in the file server 50 as the failure detection result storage file 119 (step S48).

The configurations shown in FIGS. 8 to 10 can also be realized by computer software.

FIG. 11 shows the inspection result sorting unit 4 shown in FIG.
2 shows an operation flow (1), first, an initial value is set in an address counter AC2 (A2 ← a2) (step S51), and an initial value is set in an address counter AC3 (A3 ← a3) (step S51). S52) Then, an initial value is set in the address counter AC4 (A4 ← a).
4) (Step S53).

Next, an initial value is set in the address counter AC1 (A1 ← a1) (step S54), and the defective code stored at the address (A1) of the defective code storage file is set in the register R1 (step S55). .

The part number stored in the address (A2) of the visual inspection result file 112 is stored in the register R2-1.
The fault code is stored in the register R2-2, and the position coordinates are stored in the register R2-3 (step S56).

Then, it is determined whether or not the register R2-2 is a termination code (step S57). If "YES", the process exits the flowchart. If "NO", the register R1 is further terminated. It is determined whether or not the code is a code (step S58). If "NO", it is further determined whether or not register R1 = register R2-2 (step S59). If "NO", the address is determined. The counter AC1 is incremented by "1" (step S60), and the process returns to step S54.

If "YES" in the step S58, data is transferred from the register R2-1 to the register R3-1, from the register R2-2 to the register R3-2, and from the register R2-3 to the register R3-3. (Step S61).

The register R3-1 is stored in the part number area stored in the inspection result file (for automatic verification) address (A3), and the register R3 is stored in the defective code area.
-2 is stored in the register R3-3 in the position coordinate area (step S62), and the address counter AC3 is set to "1".
Is incremented by one (step S63).

If "YES" in the step S57, data is transferred to the register R2-1 → register R4-1, register R2-2 → register R4-2, register R2-3 → register R4-3, respectively. (Step S64).

The register R4-1 is stored in the part number area stored in the inspection result file (for visual verification) address (A4), and the register R4 is stored in the defective code area.
The register R4-3 is stored in the position coordinate area (step S65), and the address counter AC4 is set to "1".
Is incremented by one (step S66).

Thereafter, the address counter AC2 is set to "1".
Is incremented by one (step S67), and the process returns to step S53.

FIG. 12 shows the inspection result sorting unit 4 shown in FIG.
The operation flow (2) of No. 2 is shown. First, an initial value is set in the address counter AC1 (A1 ← a1) (step S71), and an initial value is set in the address counter AC2 (A2 ← a2) (step S71). (S72), an initial value is set in the address counter AC3 (A3 ← a3) (step S73), and an initial value is set in the address counter AC4 (A4 ← a4) (step S74).

Next, the number of data (M) stored at the address (a1) of the defective code storage file is read (step S75), and the number of data (N) stored at the address (a2) of the visual inspection result file 112 is read. Is read (step S76).

The part number stored in the address (A2) of the visual inspection result file 112 is stored in the register R2-1.
The defective code is stored in the register R2-1, and the position coordinates are stored in the register R2-1 (step S77).

Further, the fault code stored at the address (A1) of the fault code storage file is set in the register R1 (step S78).

Then, register R1 = register R2-2
Is determined (step S79), and if “NO”, the register R2-1 → the register R4-1, the register R2-2 → the register R4-2, the register R2-3 →
Each data transfer of the register R4-3 is performed (step S80), and the inspection result file (for visual verification)
Register R4-1 is stored in the part number area of address (A4).
Is stored, the register R4-2 is stored in the defective code area, and the register R4-3 is stored in the position coordinate area (step S81). Then, the address counter AC4 is incremented by "1" (step S82).

If "YES" in the step S78, data transfer from the register R2-1 to the register R3-1, the register R2-2, the register R3-2, the register R2-3, and the register R3-3 is performed respectively ( Step S
83), the register R3-1 is stored in the part number area of the inspection result file (for automatic verification) address (A3), the register R3-2 is stored in the defective code area, and the register R3-3 is stored in the position coordinate area. Then (step S84), the address counter AC3 is incremented by "1" (step S85).

Then, the above-described processing is repeatedly performed for M address counters AC1 and N address counters AC2.

[0095]

As described above, according to the method and apparatus for inspecting the appearance of a printed circuit board unit according to the present invention, the appearance of a printed circuit board unit to be inspected is inspected by an appearance inspection machine in accordance with the test data for the appearance inspection to detect a defect. And generating test data for automatic verification by extracting only test data having the same part number as the part number in the failure detection data in the test data for the in-circuit tester. Since the components corresponding to the test data are re-inspected by a moving probe type in-circuit tester, and the re-inspection data is compared with the automatic verification test data, a final failure judgment result is output.
(1) The effect of reducing the visual re-inspection work after the printed board unit automatic appearance inspection is reduced, and (2) improving the automation rate of the printed board unit appearance inspection.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment (1) of a printed board unit appearance inspection apparatus according to the present invention.

FIG. 2 is an explanatory diagram of an automatic verify operation in the embodiment (1) of the present invention.

FIG. 3 is a block diagram schematically showing a configuration of an embodiment of a test data creating unit for automatic verification shown in FIG. 2;

FIG. 4 is a flowchart illustrating an operation example (1) of the automatic verification test data creating unit illustrated in FIG. 2;

FIG. 5 is a flowchart showing an operation example (2) of the test data creating unit for automatic verification shown in FIG. 2;

FIG. 6 is a diagram for explaining a manufacturing defect (position shift) that cannot be detected by an in-circuit tester (ICT).

FIG. 7 is a block diagram showing a configuration of an embodiment (2) of a visual inspection apparatus for a printed board unit according to the present invention.

FIG. 8 is an explanatory diagram of a manufacturing defect detection operation in the embodiment (2) of the present invention.

FIG. 9 is a flowchart showing the operation of the embodiment (2) of the present invention.

FIG. 10 is a block diagram schematically showing a configuration of an embodiment of a test result sorting unit shown in FIG. 8;

FIG. 11 is a flowchart illustrating an operation example (1) of the embodiment of the inspection result sorting unit illustrated in FIG. 8;

FIG. 12 is a flowchart illustrating an operation example (2) of the embodiment of the inspection result sorting unit illustrated in FIG. 8;

FIG. 13 is a diagram illustrating an example (an example of an IC lead soldering state inspection) in which an erroneous determination is easy in an appearance inspection.

FIG. 14 is a diagram illustrating a conventional example (1) (an example of visual verification using a printer output result).

FIG. 15 is a diagram showing a conventional example (2) (an example of verification by visual observation using a visual assistance device).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Printed board unit 2 Television camera 3-5 Probe 11 Data file 12 Data processing unit 13 XY table control unit 14 Visual inspection execution unit 15 In-circuit test execution unit 20 Visual inspection machine 30 Moving (flying) probe in-circuit tester (ICT) Reference Signs List 40 visual inspection support device 42 inspection result classification unit 111 visual inspection test data file 112 inspection result file 112 'automatic verification inspection result file 113 ICT test data file 114 automatic verification test data storage file 115, 119 failure detection result storage File 116 ICT verification target defective code storage file 117 Visual verification inspection result file 118 Visual inspection result file 221, 222, 421, 422 For data reading During register unit 223,423,424 data write register unit diagram, the same reference numerals denote the same or corresponding parts.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-207908 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05K 13/08

Claims (6)

(57) [Claims] 1. A printed circuit board unit to be inspected by a visual inspection machine according to test data for visual inspection to generate defect detection data, and the same component number as the component number in the defect detection data in the in-circuit tester test data. Automatic test data is generated by extracting only the test data of the number, and the printed circuit board unit to be inspected is re-inspected by a moving probe type in-circuit tester for parts corresponding to the automatic test data. A method for inspecting the appearance of a printed circuit board unit, comprising: outputting a final defect determination result by comparing the test data with the automatic verification test data. 2. The visual inspection data according to claim 1, wherein before the automatic verification test data is generated, the visual inspection data is separated in advance by comparing the defective detection data with a verification target defective code for an in-circuit tester. And a visual inspection apparatus for visually inspecting the data using the visual inspection data, and combining the inspection result with the final failure determination result. 3. An appearance inspection machine for inspecting the appearance of a printed circuit board unit in accordance with appearance inspection test data stored in a file in advance to generate defect detection data, and an in-circuit tester test data stored in a file in advance. And a data processing unit for generating test data for automatic verification by extracting only test data having the same part number as the part number in the failure detection data. A movable probe type in-circuit tester for inspecting and comparing the re-inspection data with the automatic verification test data to output a final failure judgment result; and an external appearance of a printed circuit board unit characterized by comprising: Inspection equipment. 4. The first data reading register according to claim 3, wherein the data processing unit reads a part number from the defect detection data and stores the read part number.
A second data reading register that reads and stores a part number and its test parameter from the in-circuit tester test data and a part number in the data stored in both registers are compared to detect only a match. An appearance inspection of a printed circuit board unit, comprising: a comparator; and a data write register for storing a matching part number detected by the comparator and its test parameter and outputting the same as test data for automatic verification. apparatus. 5. The inspection according to claim 3, wherein the data processing unit compares the failure detection data with failure determination data for an in-circuit tester to be verified which is stored in a file in advance and classifies the visual inspection data in advance. A printed board unit comprising a result sorting unit, wherein the visual inspection device performs a visual inspection using the visual inspection data, and the data processing unit combines the visual inspection result with the final failure determination result. Appearance inspection device. 6. The inspection result classification circuit according to claim 5, wherein the inspection result classification circuit comprises a data reading register for reading and storing a defect code that can be tested by the in-circuit tester, a part number, a defect code, and a position coordinate. A data register that reads and stores the failure determination data, a switch unit that compares the failure determination data of each register, and performs a switching operation according to the result;
An appearance inspection apparatus for a printed circuit board unit, comprising: a data write register that is separated and stored through the switch unit and outputs a result of a failure determination for an automatic verification and a result of a failure determination for a visual verification.