JPH05340876A - Visual inspection system - Google Patents

Abstract

PURPOSE:To obtain a visual inspection system which can perform inspections against real-time images as the object of visual inspections, can record the position and inspected result data of a faulty point, and can eliminate mental and temporal burdens from workers. CONSTITUTION:This system is provided with an X-Y table which can be moved in an arbitrary horizontal direction, horizontal driving section 9 which moves the table 10, camera 12 which takes the picture of an object to be inspected, and magnifying glass 13. In addition, the system is also provided with a camera focusing mechanism which has a function that moves the camera 12 and glass 13 and, at the same time, maintains the camera 12 and glass 13 at their moved positions, vertical driving section which drives the camera focusing mechanism, display 1 which displays the real-time video of the object to be inspected taken with the camera 12 and inspection information, input device which specifies an arbitrary point on the screen of the display 1, and control section which controls the operations of the horizontal and vertical driving sections and, at the same time, records or processes various kinds of information and inspected result data regarding the object to be inspected.

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 for use in a visual inspection for a printed wiring board assembled using minute parts and an object subjected to fine processing.

[0002]

2. Description of the Related Art Conventionally, in visual inspection of a printed wiring board or the like, a method is generally used in which an operator inspects a predetermined inspection place in a predetermined order using a magnifying glass.
In this case, in order to record the inspection results, prepare an enlarged drawing of the inspection object and the specified recording paper at hand,
The method was to fill in the inspection results one by one on the same drawing or sheet. Further, in order to compile the inspection results, it is necessary to separately record the records entered on the drawings or the sheets when the inspection results reach a certain amount in a database on a computer. Further, there is a system in which an image of an inspection object is displayed on a display by a computer CAD, and the position of a defective portion found by the above inspection method is specified by using an input device to input data, but it is displayed on the display. The real-time image itself of the inspection object is the target of the visual inspection, and the defective portion on the image and the inspection information displayed at the same time as the image are respectively specified by using the input device, so that the portion is registered in advance. There is no system that records all the information and the inspection information about the location as one inspection result data and records them one by one. The conventional method as described above has the following problems. For example, when a worker finds a defective portion on a printed wiring board and writes inspection information on the portion on an enlarged drawing, the position of the defective portion on the drawing must be confirmed without fail. If there is a defective part in an area where many parts are densely packed or areas where similar-shaped parts are concentrated, the worker is required to be extremely careful and concentrated, and the work man-hour becomes enormous. Was there. Further, even in the method using the recording sheet, in order to write the inspection information of the found defective portion on the recording sheet, it is necessary to read the circuit symbol or the like of the defective portion from the enlarged drawing. Have. Furthermore, in the work of inputting the inspection results written on the enlarged drawing or the recording sheet into the database on the computer, there is a high probability that the operator will make a mistake in reading or inputting the records, which will reduce the reliability of the counting results. As a result, it may lead to incorrect analysis results. On the other hand, in the method of identifying the defective portion by using the image of the inspection object by the computer CAD described above, it is necessary for the operator to always recognize whether or not the inspection portion matches the screen displayed on the display. In addition to the above, it is necessary to confirm the detected defective portion on the display, and the operator is required to have considerable caution and experience.

[0003]

Although the conventionally known visual inspection method has the above-mentioned problems, the present invention has been made in view of such problems, and an object of the invention is to solve the problems. Is a target for visual inspection by automatically displaying a real-time image of an arbitrary portion of the visual inspection object on the display for an arbitrary time with an arbitrary projection magnification and an arbitrary display order. In addition, the position of the defective portion on the image and the inspection information displayed at the same time as the image are respectively specified by using the input device, so that the information registered in advance for the portion and the inspection information for the portion are specified. It is possible to record or process as one inspection result data one by one by combining with, and as a result, the operator is completely aware of the inspection location and the inspection sequence. An operator who can quickly and surely perform inspection without fail, and which is required for the above-described confirmation and entry work or the work of registering the record, which is performed in order to temporarily record the information of the defective portion. It is intended to provide a visual inspection system that can eliminate the mental and time burden of the. An automatic image display system (patent filed on June 8, 1992) using a camera focusing mechanism (utility model filed on April 27, 1992) as a mechanism for focusing an image at an arbitrary projection magnification ) Is adopted in the system, the system is mechanically and physically simplified, and at the same time, it is intended to provide a visual inspection system capable of reducing the manufacturing cost and simplifying the operation, operation, and maintenance work. It is a thing.

[0004]

In order to achieve the above object, a visual inspection system according to the present invention includes an XY table that moves in an arbitrary horizontal direction, a horizontal drive unit that moves the XY table, and a visual check on the XY table. A camera and a magnifying lens for projecting an inspection object, a camera focusing mechanism having a function of moving the camera and the magnifying lens and holding them at a position after the movement, and a vertical drive unit for driving the camera focusing mechanism, A display for displaying a real-time image of the projected visual inspection object and inspection information, an input device for specifying an arbitrary position on the display, and a variety of visual inspection objects while controlling the operations of the horizontal drive unit and the vertical drive unit. The control unit has a function of recording or processing information and inspection result data.

[0005]

Next, the present invention will be described with reference to the accompanying drawings showing an embodiment thereof. This embodiment relates to the case where the system according to the present invention is used when visually inspecting a printed wiring board on which components are mounted. In this embodiment, a computer is used as a control unit, a dot type touch panel is used as an input device, and a vertical drive unit that drives a camera focusing mechanism is composed of a gear and a motor. A control program for controlling the present system is stored in the computer, and the program has a function of simultaneously displaying an image and an image on the display to divide the display into an image display area and a defect factor display area. Function to set or change projection conditions such as projection location, projection magnification, projection order, projection time, etc., and function to issue a signal based on the projection conditions to operate the horizontal drive unit and the vertical drive unit in cooperation with each other. When,
A function to arbitrarily set or change the correspondence data between the position of parts in the projection area and the position of the touch panel dot for each projection area, and to record and change various information about the printed wiring board and the inspection information displayed on the display. , Has a function of processing and a function of recording and processing the inspection result data. 8 to 9, the screen of the display 1 is controlled so that the upper portion thereof is the defect factor display area 4 and the lower portion thereof is the image display area 5, and the surface of the display 1 is a dot type touch panel 2 Is stuck. Also, each dot 3 located on the defect factor display area 4 corresponds to each defect factor number 7, and the relationship is registered in the computer 8 in advance. In order to perform a visual inspection using this system, it is necessary to perform the following basic data registration or modification work prior to the inspection. First, the control program is executed, and basic data such as the size of the printed wiring board to be inspected, the part number of each part on the board, coordinate data, circuit symbols, and other unique data of each part are stored. Register on the computer as. Next, the XY table and the camera focusing mechanism are operated in the manual mode on the control program to register or change the projection location on the board, the projection magnification of the location, the projection order, and the projection time for each projection location. That is, in FIG. 1 to FIG. 8, the printed wiring board 11 is placed on the XY table 10, and the XY table 10 is arbitrarily moved while watching the image displayed on the display 1 to determine the projected portion. Subsequently, the position of the magnifying lens 13 is moved to determine the projection magnification, and the camera 12 is moved to the position where the image is focused at the magnification. After that, the projection order and projection time for each determined projection location are input from a keyboard or the like connected to the computer 8. By repeating these operations a required number of times, drive data for each printed wiring board is created and registered. During the above work, the control program asks how much the position of the XY table at the projection position moves relative to the reference point or the position at the projection position in the immediately preceding projection order, and Each dot on the touch panel is projected to each projection position in order to calculate how much the magnifying lens and camera position move relative to their reference position or those positions in the projection position in the immediately preceding projection order. In, it is possible to automatically record which component is located on the image and to record the drive data. After registering the basic data and the driving data, when the system is operated in the control program in the automatic mode and the visual inspection is started, the XY table and the camera focusing mechanism are operated as follows by the signal issued by the control program based on the driving data. Such an operation is performed. That is, in FIG. 1 and FIG. 2 to FIG. 3, the horizontal drive unit 9 which receives the above-mentioned signal displays the image of the first projected portion on the display 1 so as to display the XY table 10 and the XY table 1.
The printed wiring board 11 fixed on 0 is moved from the position shown in FIG. 2 to the position shown in FIG. On the other hand, the motor 15, which also receives a signal from the control program, is necessary to move the moving units 28 and 30 to the positions to obtain the projection magnification set in the projection portion in FIGS. 4 to 6. Rotate the required number of times in the direction. Similarly, the motor 16 also moves to a position set to focus at the projection magnification of the projection location.
To move 7, 29, rotate the required number of times in the required direction. For example, when the image displayed on the display is first sent from the image of an arbitrary projection portion to the image of the projection portion set to a magnification higher than the projection magnification at that portion, in FIG. , 16 are
The gears 18 and 20 are rotated via the gears 17 and 19 so as to rotate in directions opposite to the clockwise direction when viewed from above. Further, this rotation is performed by moving the moving plates 31, 3 via the rotating shafts 25, 26 and the moving units 27, 28, 29, 30.
It is transmitted as a vertical movement of 2, 33, 34, and the moving plate 3
The magnifying lens 13 and the camera 12 connected to 1, 32, 33 and 34 move downward and are stopped and held at the positions shown in FIGS. When the image is sent to the image of the projection portion where the projection magnification is set low, the motors 15 and 16 rotate in the opposite direction to the above example, and the magnifying lens 13 and the camera 12 move upward. While executing the automatic mode on the control program, the present system performs the above-mentioned operation based on the drive data so as to sequentially display the images of the set projection portion on the display under the conditions set for each portion. .. Next, a procedure for creating and recording inspection result data in this system will be described. When the operator finds a defective part on an arbitrary image while the system is operating in the automatic mode, the operator lightly touches an arbitrary position in the area of the defective part on the touch panel 2 with a fingertip in FIGS. 1 to 8. Push. Then, the dot 3 located in the pressed portion senses the operation and sends a signal to the computer 8. The control program which has received the signal determines from which dot in which image the signal comes, and searches the basic data of the corresponding part. Then, the failure factor number 7 of the defective part is similarly specified by pressing the touch panel 2 to create and record one inspection result data together with the basic data. Although one embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the embodiment, and various modifications can be made and implemented. For example, instead of the dot type touch panel, an ultrasonic type touch panel or a mouse can be used as the input device. Further, in order to be able to set a wider range of projection magnification, it is possible to provide the support column with a telescopic mechanism and to control the control program by combining the mechanism with the horizontal drive section and the vertical drive section.
It is also possible to use a plurality of camera focusing mechanisms and control the operation for each vertical drive unit included in them. In this case, it is possible to add a function of dividing the display part of the display and the touch panel into a plurality of parts and displaying a plurality of images at the same time, and a function of arbitrarily selecting the images to be displayed. Furthermore, the following functions can be added individually or in combination. Firstly, the recorded inspection result data is searched one by one,
A function to aggregate, edit, and output. Secondly, in setting or changing the drive data described above, by registering the relative position of the camera with respect to an arbitrary position of the magnifying lens on the guide rail in advance, the camera can always follow the movement of the magnifying lens. Function to move and focus on the projection. Third, the function that can be switched between automatic mode and manual mode. Fourthly, in both the automatic and manual modes, the function of advancing or retracting the projection position arbitrarily and the function of changing the projection magnification one by one and automatically adjusting the projection focus one by one accordingly. Fifth, the function to suspend the automatic mode. Sixth, a mechanism for automatically operating various cameras used in this system and a function for operating the mechanism in cooperation with other mechanisms. Seventh, the function to print the video displayed on the display one by one and the function to record it as video data and display it on the display arbitrarily.
Eighth, a function of reading data created by another system and creating basic data and drive data of this system using the data, and a function of automatically creating drive data based on the read data. Ninth, a function of instructing the control program to work by displaying the work items of the control program on the display simultaneously with the video and specifying an arbitrary item using the input device. Tenth, in addition to the above-mentioned defect factors, other various inspection information is arbitrarily displayed at the same time as the video, and the information specified by the input device from among them is recorded as a part of the inspection result data.

[0006]

Since the present invention is configured as described above, it has the following effects. First, by displaying a real-time image of a predetermined inspection location on a display at a predetermined projection magnification and projection order, the image itself can be the target of visual inspection, and the operator can inspect the location. Not only can inspection work be carried out smoothly without paying attention to the inspection sequence, but it is also possible to prevent missing of defective parts due to uninspected. Secondly, from the real-time image of the inspection point displayed on the display and the inspection information displayed at the same time as the image, the inspection result data can be obtained by simply specifying various inspection information regarding the defective point and the point with a simple operation. Since it can be recorded, anyone can easily operate it regardless of experience. Thirdly, since it is possible to eliminate the work required to temporarily record the inspection result on the drawing or the recording sheet and the work to register the recorded data in the database again, in addition to the above first and second effects,
The work efficiency of the entire inspection process can be dramatically improved. Fourth, as a mechanism for focusing an image at an arbitrary magnification, a camera focusing mechanism (April 1992)
By adopting an automatic image display system (patent filed on June 8, 1992) using a utility model filed on May 27th, the system is mechanically and physically simplified and manufactured. It is possible to reduce costs and simplify operations, operations and maintenance. Fifth, it is possible to provide the inspector with the projection magnification and the projection order of the image in the inspection area in the range that is most inspectable at any time without any inconvenience to the inspector. This contributes to prevention of erroneous determination and improvement of inspection results.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a system configuration.

FIG. 2 is a plan view of a horizontal drive unit showing the operation of an XY table.

FIG. 3 is a plan view of a horizontal drive unit showing the operation of the XY table.

FIG. 4 is a side view of a camera focusing mechanism, which is partially transparent.

FIG. 5 is a side view of a camera focusing mechanism with a part thereof seen through.

FIG. 6 is a front view of a main part of a drive mechanism of a camera focusing mechanism.

FIG. 7 is a front view of a main part of a drive mechanism of a camera focusing mechanism.

FIG. 8 is a schematic diagram showing the relationship between the touch panel and the display on the display.

FIG. 9 is a schematic view of a display showing a defect factor display area and a video display area.

[Explanation of symbols]

 1 Display 2 Touch Panel 3 Dot 4 Defect Factor Display Area 5 Image Display Area 6 Parts 7 Defect Factor Number 8 Computer 9 Horizontal Drive 10 XY Table 11 Printed Wiring Board 12 Camera 13 Magnifying Lens 14 Bellows 15, 16 Motors 17, 18, 19 , 20 gears 21 columns 22 back plates 23, 24 guide rails 25, 26 rotating shafts 27, 28, 29, 30 moving units 31, 32, 33, 34 moving plates 35, 36, 37, 38 stoppers

Claims (3)

[Claims] 1. An XY table that moves in an arbitrary horizontal direction, a horizontal drive unit that moves the XY table, a camera and a magnifying lens for projecting a visual inspection object on the XY table, and a camera and a magnifying lens. Also, a camera focusing mechanism having a function of holding them in the position after movement, a vertical drive unit that drives the camera focusing mechanism, a display that displays a real-time image and inspection information of a projected visual inspection object, and a display It is composed of an input device for specifying any position above and a control unit for controlling the operation of the horizontal drive unit and the vertical drive unit and having a function of recording or processing various information regarding the visual inspection object and inspection result data. A visual inspection system characterized in that 2. A function capable of arbitrarily setting or changing projection conditions such as the number of real-time images displayed on the display, projection magnification of each image, projection order, projection time, etc., and the setting or changing. The visual inspection system according to claim 1, further comprising a function of automatically operating the horizontal drive unit and the vertical drive unit in association with each other. 3. A real-time image itself displayed on a display is targeted for visual inspection, and an arbitrary portion on the image and inspection information displayed on the display at the same time as the image are specified using an input device. 3. The visual inspection according to claim 1 or 2, further comprising a function of recording various pieces of information regarding the location and inspection information regarding the location into one inspection result data, which is recorded in the control unit one by one. Inspection system.