JPH03131985A - Device for inspecting mounted substrate - Google Patents

Abstract

PURPOSE:To improve the efficiency of teaching work by registering the past data directly as the current formal data when a registered land shape is superposed to the real image of the land. CONSTITUTION:The shape and size of the land and a norm for the positional relation to the parts to be inspected are set up so as to be included within a recommended value provided from a parts manufacture and all the kinds of parts to be inspected are previously calculated and registered in a memory 45. A central processing part 41 moves an XY stage 11 based upon parts mounting data, sets up the land pattern to be inspected on the visual center of a TV camera 31 and sends its image to an image processing part 44. The processing part 41 retrieves a land normal shape matched with the parts based upon the parts sort data out of the parts mounting data and displays the land normal shape so as to superpose it on the real image of the land on the position regulated by the parts mounting data. When the correction of the superposition is unnecessary, the past data are directly considered as the current formal data and registered in the memory 45.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention is directed to teaching an inspection device to individually check images of components mounted on a board to determine whether the mounting condition is good or not. Regarding the method.

(b) Conventional technology In recent years, more and more surface-mounted components have been used in constructing electronic circuits. Compared to those where the leads are inserted into through-holes on the board, surface-mounted components are more likely to be misaligned with respect to the land, so the mounting condition must be inspected before the soldering process to ensure that the component has a good solder connection. I need to find out if it is possible. As an example of a device used for this purpose, there is
What is described in Publication No. 90707 or JP-A No. 6
Examples include those described in Japanese Patent No. 4-26983. In all of these devices, images of the board are captured by a television camera, and the images of the parts to be inspected are individually checked to determine whether the mounted state is good or bad.

(c) Problems to be Solved by the Invention In determining whether the mounted state is good or bad, the degree of overlap between the component and the land is an important factor. Therefore, the positions and shapes and dimensions of the parts and lands are determined individually, and the data of both are compared to check the degree of overlap. Therefore, it is necessary to teach the component shape and land shape from the actual board. The present invention aims to improve the efficiency of this teaching.

2) Means for Solving the Problems In the present invention, the land of the board is projected as an image, and the land data is registered by performing teaching based on this land image. When a land that can be combined with a part is encountered, the registered land shape is automatically read out from memory and displayed overlaid on the land in the actual image, and the displayed shape can be registered as is as official land data.

(e) Overlay the registered land shape on the actual land image, and if the overlap is satisfactory, you can save the trouble of re-teaching from the actual land image and register the past pig as the official data for this time. . Therefore, the efficiency of teaching work is improved.

(F) Embodiment FIG. 1 shows the overall configuration of a mounted board inspection apparatus 1. Reference numeral 10 denotes an XY stage section, which includes an XY stage 11 on which the mounting board Fi2 is placed. 20 is an illumination unit that irradiates the substrate 2 with light of a predetermined amount and spectrum configuration from a predetermined direction;
30 is an imaging section equipped with a television camera 31 that keeps a certain area of the substrate 2 in view, and 40 is a processing section that performs various processes and commands. 41 is a central processing unit that forms the core of the processing unit 40, which is connected to the A/D conversion unit 43 via a pass line 42;
Image processing unit 44, memory 45, imaging controller 46,
XY stage controller 47, video display device 48, data display device 49, keyboard 5
0, printer 51 is connected. The imaging controller 46 controls the imaging section 30 and the illumination section 20, and the imaging section 30 performs zooming and exposure adjustment of the television camera 31, and the illumination section 20 performs illuminance adjustment and switching of illumination direction.

Land pattern teaching in the device 1 is as follows:
This is done by following the steps below:

Step A: For the parts used on the board to be inspected, the standards for the shape and dimensions of the land and the positional relationship with respect to the parts are set so that they fall within the values recommended by the parts manufacturer. This is automatically calculated by the calculation program if the part shape is given. FIG. 2 shows the component 3 and the land standard shape 4 obtained by calculation. Calculations are completed in advance for all types of parts to be inspected and registered in the memory 45 (.

Step B: The central processing unit 41 moves the XY stage 11 based on the component mounting data to place the land pattern to be inspected at the center of the field of view of the television camera 31. In this case, component position data for component mounting can be used as is as movement data for the XY stage. TV camera 3
The image taken in No. 1 is sent to the image processing section 44 via the A/D conversion section 43, subjected to necessary processing such as contrast enhancement, and then displayed on the video display device 48. Here, the central processing unit 41 searches for a land reference shape that matches the component based on the component type data in the component mounting data, and displays it superimposed on the actual land image 5 at the position specified by the component mounting data. (Figure 3). 6 is a cross mark indicating the position where the component is to be mounted, that is, the center of the component.

Step C: Check the degree of overlap between the actual image 5 of the land and the reference shape 4, and decide whether or not the reference shape 4 may be registered without modification as corresponding to the actual shape of the land. This determination can also be made automatically by a pattern matching program.

For lands whose standard shape 4 cannot be used in step D and step C, teaching is performed in accordance with the actual shape. FIG. 4 shows an example in which correction is required due to mismatch between the standard shape 4 and the actual direct image 5. At this time, a cross-shaped cursor 7 is displayed by the central processing unit 41 as shown in FIG. By operating the keyboard 50, the cursor 7 is placed on the diagonal corner of the actual land image 5, and the dimensions and position of the land are taught.

Land data (i.e. standard data) determined as not requiring correction in Step E, Step C or Step D
The modified land data (data taught from the actual land shape) is registered as official land data by operating the keyboard 50. The modified land data is registered in the buffer area 52 of the memory 45.

Thereafter, the same procedure is repeated, and the teaching of the land pattern is continued for all of the locations to be inspected. The flow of processing during that time is as shown in FIG. The data display device 49 is used to display data regarding the part 3 or the land 4 in characters and numbers from time to time.

Now, in the present invention, the land data corrected in step D is used for later teaching work.

That is, when a land that can be combined with a part of the same type as a part for which land shape teaching was performed and land data was registered in the past, the central processing unit 41 stores data in the memory 45.
The registered land shape is automatically read out from the map and displayed superimposed on the actual land image 5 (FIG. 6). If the degree of overlapping is satisfactory, it is registered in the memory 45 by operating the keyboard 50. This has a higher probability of overlap than the standard shape obtained by calculation. The flow of processing is as shown in FIG.

(g) Effects of the Invention According to the present invention, the land data registered in the past can be reused and the effort of teaching using a cursor can be omitted, so the teaching work can be greatly speeded up.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an inspection apparatus for inspecting a mounted board according to the present invention, FIGS. 2 to 6 are model diagrams of display screens, and FIGS. 7 and 8 are process flowcharts.

Claims (1)

[Claims] (1) In devices that display the land of the board as an image and perform teaching based on this land image to register land data, when a land that can be combined with a component of the same type as a component for which land data has been registered in the past is encountered. A mounted board inspection device is characterized in that a registered land shape is automatically read out from a memory, is displayed superimposed on a land in an actual image, and the displayed shape can be registered as is as official land data.