JP3105365B2 - Visual inspection system with automatic inspection function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual inspection system with an automatic inspection function suitably used for a printed wiring board assembled using minute parts and an object subjected to fine processing.

[0002]

2. Description of the Related Art The applicant of the present invention has previously described a visual inspection system (Japanese Patent Application No. 4-188525) as a device to be used for smoothly and surely performing an external visual inspection of a printed wiring board or the like.
No.).

As shown in FIGS. 1 and 2, the system uses a camera 4 and a magnifying lens 5 to capture an image of a printed wiring board 8 as an object to be inspected, and displays a real-time video screen at an arbitrary projection magnification and an arbitrary projection magnification. By automatically displaying the image on the display 1 for an arbitrary time in the display order described above, the image screen itself can be used as a target of the visual inspection, and the position of the defective portion on the image screen and the image screen At the same time, the inspection information to be displayed is specified using the input device (the touch panel 2 ) , so that the information registered in advance for the location and the inspection information for the location are combined and recorded as one inspection data. It has the function of processing.

In the system, the XY table 7 on which the printed wiring board 8 is mounted is driven and controlled by the horizontal drive unit 6 so that a predetermined image screen including inspection points is displayed in the display 1 in a predetermined order. It can be displayed sequentially on top. For this reason, the inspector can carry out the inspection work smoothly without being conscious of the inspection location and the inspection order, and a considerable effect can be obtained with respect to the prevention of the uninspection.

[0005] However, the visual inspection system is based on the fact that it is the operator who makes the quality judgment in the visual inspection and that the oversight of defects in the visual inspection process has a great adverse effect on the subsequent processes. It is not an exaggeration to say that even if an inspection is carried out using, if the operator overlooks a defect, the effect is equal to zero.

[0006] As one measure to solve such a problem, it is possible to evoke higher concentration and attention from the operator. It is impossible to exceed the limits of the ability of human vision or vision even if paying. For example,
As the image on the display is switched from one to the next, the afterimage of the previously displayed image and the current image may unconsciously intersect, causing incorrect judgment. is there.

As another measure, it is possible to provide a margin for the inspection time per image, but it is not possible to solve the fundamental problem of the above-mentioned limitation of the capability unless a very large margin is provided. Rather, it is not very realistic given the amount of time loss caused by it.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a visual inspection system (Japanese Patent Application No. 4-188) previously filed by the present applicant.
No. 525), the system itself adds a function of automatically performing an inspection, and performs an automatic inspection in parallel with a visual inspection by an inspector, thereby improving reliability of inspection results and inspection work efficiency. Is what you do.

[0009]

Therefore, a visual inspection system with an automatic inspection function according to the present invention displays an image of a predetermined inspection position of an inspection object on an XY table on a display using a camera and a magnifying lens. By,
Means for providing a video screen of the inspection point with respect to the inspector, an input device for inputting information about the inspection results of the inspection point, record the information input by the input device, and a control unit for processing, the A visual inspection system having an automatic inspection by image processing on the image of the inspection point independently of the inspection by the inspector in parallel with the inspection by the inspector. If it is determined that is, a predetermined error mark is overwritten and displayed on the corresponding portion on the video screen, and the portion where the error mark is overwritten and displayed is
Corresponding to the input or defective-free indicating poor chromatic by the input device
As long as the input indicating unlocking of is not performed, it is characterized by prohibiting the switching of the image screen on the display.

The inspection system according to the present invention is used, for example, when performing a visual inspection of a printed wiring board on which components are mounted. The present invention relates to a visual inspection system (Japanese Patent Application No.
188525), the description herein will be limited only to the functions newly added by the present invention in principle, but if necessary, the visual inspection system (Japanese Patent Application No. No. 4-188525).

The automatic inspection program executed by the control unit according to the present invention includes, for example, various kinds of information on a printed wiring board, that is, the size, coordinates, size, shape, circuit symbol, image processing data, etc. The function to create and record in advance the reference data for each video screen when the components to be mounted on the printed wiring board to be inspected are correctly mounted at the positions where they should be mounted by combining And a function of automatically performing an inspection on the substrate using the reference data in parallel with the inspection work of the inspector.

In order to further improve the function of performing the above-mentioned automatic inspection, it is assumed that the position of the printed wiring board placed on the XY table is deviated from the origin, and the magnitude of the deviation is determined. It has a function of recognizing and converting the data for each substrate or for each video screen or both, and reflecting the data in the reference data.

[0013]

Next, a method of recognizing the positional deviation for each printed wiring board 8 and recognizing the positional deviation also for each screen, simultaneously performs a visual inspection by an inspector and an original automatic inspection by an inspection program. An example to be implemented will be described with reference to the accompanying drawings.

In FIG. 1 and FIG.
A video screen including a recognition mark 9 indicating the reference position of the printed wiring board 8 placed on the Y table 7 is displayed, and when the operator instructs the operation, the inspection program executes the recognition in the reference data corresponding to the video screen. The difference between the position information on the mark 9 and the position information on the recognition mark 9 in the actually captured inspection image is calculated. The calculated difference is reflected on the reference data for each video screen sequentially displayed thereafter.

Further, in FIG. 3, after the above operation, when the first video screen to be inspected is displayed, the inspection program performs the following processing. That is, the difference between the position information of the specific reference portion 10 other than the component and the position information of the reference portion 10 in the actually captured inspection image in the reference data corresponding to the screen in which the above difference is reflected in advance. calculate. Then, the correction is performed by reflecting the difference in each position information of the inspection target component in the screen. The inspection program performs calculation or processing on each image of the inspection target component using the corrected position information, and determines pass / fail based on the result.

In FIG. 4, if it is determined by the inspection program that the component 12 is defective (the drawing indicates a missing item), the inspection program determines a prominent color on the video screen of the component 12 on the display 1. Or the message (error mark) 11 of the shape is overwritten and displayed. If the inspector does not notice the message 11 and finishes the visual inspection and tries to display the next video screen, the inspection program does not follow the instruction and emits a warning sound. As a result, it is possible to reliably draw the attention of the inspector to the component 12 determined to be defective in the inspection program.

Accordingly, the inspector performs a visual inspection again on the part 12 for which the inspection program is determined to be defective, and uses the input device (touch panel 2) if the inspection shows that the part 12 is also defective. If the inspection result data (defective data) is not input, the next video screen cannot be displayed. On the other hand, even if it is determined that the inspection program is not defective as a result of the visual inspection, an instruction to unlock the inspection program must be issued from the input device. That is,
For the points determined as errors by the inspection program,
As long as the input indicating unlocking corresponding to the input or defective-free indicating the failure organic is not performed, switching display on the image screen of the next inspection image is prohibited.

Although the embodiment of the present invention has been described with reference to the drawings, the present invention is not limited to the above embodiment, and can be implemented with various modifications. .

For example, first, the timing for displaying the message 11 in the above embodiment can be limited to a case where the inspector requests the next video screen without inputting the inspection data for the part 12 into the database. It is.

Second, one or more sets of the present system may be connected to the mounting process line of the printed wiring board 8.
In addition, it may be used in connection with a so-called marking system for marking a defective part.

Third, it is possible to control the operation of the inspection program by sensing the placement of the printed wiring board 8 on the XY table 7 and the removal from the XY table 7 using a sensor mechanism.

Fourth, when the inspection is performed with priority given to the automatic inspection, if the inspection program does not find a defective part, the video screen is automatically advanced sequentially, and a defective part is found on the video screen. It is possible to provide the inspection program with a function of issuing an audio warning in order to prompt the user to input inspection data or perform an erroneous determination process only when the inspection is performed. As a result, one worker can manage a plurality of systems at the same time.

[0023]

As described above, according to the present invention, the visual inspection by the operator and the automatic inspection by the inspection program are performed in parallel, and the presence of a defect is indicated for a portion determined as an error by the control section. Corresponds to input or no defect
Unless performed input indicating unlocking to, because of a structure that prohibits switching of the image screen, a missed defective portion can be reliably and significantly reduced, which greatly contributes to the improvement of reliability of the test result.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a system according to the present invention.

FIG. 2 is a schematic diagram of a video screen showing a correction function using a recognition mark.

FIG. 3 is a schematic diagram of a video screen showing a correction function using a reference portion.

FIG. 4 is a schematic diagram of a video screen showing a display state of a message (error mark).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display 2 Touch panel 3 Control part 4 XY table 5 Printed wiring board 6 Drive part 7 Camera 8 Recognition mark 9 Reference part 10 Message (error mark) 11 Parts

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01N 21/84-21/958 G01N 21/00-21/01 G01N 21/17-21/61

Claims (1)

(57) [Claims] 1. A means for providing an inspector with an image screen of the inspection point by displaying an image of a predetermined inspection point of the inspection object on the XY table on a display using a camera and a magnifying lens. parallel when an input device for inputting information about the inspection results of the inspection point, record the information input by the input device, a visual inspection system having a control unit, the to be processed, and the inspection by the inspector Then, the control unit independently performs an automatic inspection by image processing on the image of the inspection location, and when the control unit determines that the inspection location is defective, a corresponding image on the video screen is displayed. overwriting display a predetermined error mark to the location, to place this error mark is overwritten displayed, and the input indicating the failure chromatic by the input device As long as the input indicating <br/> unlocking corresponding to the defective-free is not performed, automatic inspection function visual inspection system and inhibits the switching of the image screen on the display.