JPH0961130A - Inspection apparatus for design shape of land and printing mask hole in electronic-component mounting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection apparatus by which whether a land and mask hole shape is proper or not is inspected before a mounting operation by a method wherein design reference information according to an object board is compared with actual land and mask hole shape information. SOLUTION: In a readout part 4, by using a camera, an actual printed-circuit board is read out in the case of a land, a printing mask is read out in the case of a mask, and a land and mask hole shape part is extracted as shape information from image information which is output from it. On the other hand, shape information on a component which is used is selected as a component shape code, it is combined with land and mask hole shape information so as to be input by a data input part 1. In addition, a standard-design-information storage part 2 stores the recommended design shape of a land and mask hole as a standard design reference, and a shape-quality judgment part 3 takes out a design reference corresponding to a key such as the component shape code or the like. Then, it is compared with data from the input part 1, whether their difference is within a tolerance or not is judged, and a result is output. Thereby, whether the shape of the land and mask hole is proper or not can be inspected before a mounting operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting a design shape of a land or a print mask hole of a printed board in an electronic part mounting process for mounting an electronic part on a printed board.

[0002]

2. Description of the Related Art An example of a conventional method for inspecting a land shape of a printed circuit board used in an electronic component mounting process and a hole shape of a cream solder printing mask will be described with reference to FIG. First, a printed circuit board is designed by a CAD system, and at the same time, pattern rules such as wiring are checked.

After the printed circuit board is designed, when it is outputted as CAD data, the board manufacturing section first manufactures the board based on the CAD data. However, the board is often modified during the manufacture due to a change in specifications. On the other hand, in the CAM system, based on the CAD data, the NC data, which is the operation data of the mounting equipment, is created by linking with various mounting condition databases such as the part shape and the construction method conditions in the CAM system.

Finally, the NC equipment and the printed circuit board are used to mount components in the mounting equipment.

[0005]

However, the design check in the CAD system is mainly an electrical check for guaranteeing the performance of the board itself, and a check from the mounting condition side which is a condition for mounting components. Is not done enough. This is because it is not always clear at the design stage what kind of mounting material and construction method conditions are used in the actual mounting process. Further, when the CAD design is outsourced, it is often difficult to perform the check itself.

Further, when the board is corrected at the time of manufacturing the board, the CAD data already output does not reflect the correction data, so that the CAD data and the actual shape of the board are different from each other. Generally, recommended lands and mask shapes are specified for each component and mounting process, but there was no system for automatically checking whether or not appropriate lands and masks were designed based on such mounting know-how. Therefore, there is a problem that the shape defects of the land and the mask are first checked in the mounting process of the substrate.

[0007]

[Means for Solving the Problem] To solve this problem, in the CAM system of the component mounting apparatus, the land mask shape should be appropriate again before the actual mounting work centering on the mounting condition side. A function to check whether there is any is required. In order to achieve the above object, the present invention provides an input section for optically reading land or print mask hole shape information of a substrate to be inspected from an actual printed board or print mask, and land or print mask hole design reference information. A storage unit to store and design reference information according to the target substrate are extracted from the storage unit and compared with land or print mask hole shape information from the input unit to determine whether the shape on the target substrate is within the reference And a determination unit that does

Further, the storage section has a storage area for information on the land or print mask hole design reference shape, the shape of the corresponding electronic component, and the mounting method conditions to be used. Further, the input unit has a function of reading the print CAD design information instead of the scanner. Furthermore, in order to automatically build the design reference shape, based on the quality performance data from the inspection machine,
A selection unit that selects a non-defective land and / or mask shape, and a registration unit that registers the land and / or mask shape selected by the selection unit and related mounting method condition information in the storage unit.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. A first embodiment of the present invention will be described with reference to FIG. The reading unit 4 reads an actual printed circuit board in the case of a land and a printing mask in the case of a mask with a scanner, and extracts a land / mask shape portion as shape information from image information output from the scanner. On the other hand, the shape information of the part being used is selected as a part shape code, and is input in the data input unit 1 in combination with the land / mask shape information. On the other hand, the storage unit 2 stores the recommended design shape of the land mask as a standard design standard, and the design standard corresponding to the key such as the part shape code is taken out and compared with the data from the input unit 1 by the judgment unit 3. The result is output.

In a printed circuit board that actually uses cream solder, the areas other than the land are covered with resist, so that the brightness and color are greatly different, and extracting the land from the image information is an existing image processing. This can be easily done with technology. Even in the case of a print mask, the hole portion and the other portions have large differences in brightness and color, so that it is similarly easy to extract the hole portion.

The input of the part shape code is shown in FIG.
As shown in (b), the size of the component on the mounted board is actually measured to obtain the size, or the component name and the component shape registered in advance based on the component name and the mounting position data used from the CAD data. A method of obtaining from the code correspondence table can be considered. Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 2A shows an example of registration of standard design standard information of a land mask. In a general printed circuit board for surface mounting, the shape of the land and the print mask can be expressed almost as a rectangle.
As the standard shape of the land mask of the component as shown in FIG. 8B, the positions x, y, θ from the component center 5, the sizes X, Y and the area S of each land mask are registered. Further, the allowable value used in the comparison with the land mask shape value of the target substrate is also registered. Depending on the solder material used and the allowable value of the lead size of the corresponding component, if the allowable values differ even for the same design shape, they are registered separately as different cell shape codes.

Further, FIG. 3A is an example of registration of shape information of parts. Information such as the outer size, the number of leads, and the lead shape classification and size is registered for each shape type of the component. FIG. 3B is an example of registration of real shape information of parts. Further, FIG. 4 is an example of registration of mounting method conditions. The shape code of the cell menu, which is the optimum land / mask shape, is determined from the shape of the target part and the construction method conditions during mounting.

When the actual board and the print mask are measured, the actual land mask shape is determined from the board and the print mask before mounting. The feature quantities such as position, angle, size, and area are calculated from the actual image information as shown in FIG.
The data as shown in FIG. 7B is obtained. In addition, when the mounted test board is measured, the measurement results shown in FIG.
Actual shape data as shown in (b) is obtained. First, FIG.
3B is compared with FIG. 3A, a part which seems to have the same shape as the part shape code shown in FIG. 3B is searched from FIG. 3A, and the part shape code is used as the part shape code. Replace with. At this time, the measurement value of the part shape shown in FIG. 3B may be slightly different from the catalog design value due to the influence of the measurement error and the variation error of each part. Therefore, it is necessary to consider this error range. There is.

Next, the cell menu shape code is determined from FIG. 4 based on the replaced part shape code. With this cell menu shape code, the standard design standard is obtained from FIG. The reference size of FIG. 2A and FIG.
The actual design sizes in (b) are compared and it is determined whether the difference is within an allowable value. When the file of the component name and the mounting position information can be separately obtained, the file shown in FIG. 6A is used instead of the file shown in FIG. 6B. At this time, as shown in FIG. 5, the shape of the component with each component name is normally managed separately, and the component shape code can be obtained from FIG. 5 with the component name as a key.

Next, when the land mask shape information input by the input unit 1 is CAD data, it becomes as shown in FIGS. 6 (a) and 7 (a). A component shape code is obtained from FIG. 5 using the component name as a key. Based on this and the construction method condition code determined from the mounting line, the cell menu shape code is determined from FIG. 4, and this code determines the standard design from FIG. 2 (a). Standards are required. The reference size in FIG. 2A and the actual design size in FIG. 7A are compared to determine whether the difference is within an allowable value.

Next, another embodiment will be described with reference to FIGS. The inspection device operates based on the operation data already created, and the inspection quality data is output. Based on this quality data, the non-defective land / mask selecting unit 6 selects data, and based on the selection result, the non-defective one of the land / mask shape of the target substrate output from the inspection apparatus and the mounting condition data used. The data of the parts is stored in the data registration unit 7 in the storage unit 2
Register with.

FIG. 9 shows an example of inspection quality data. A defect code indicating the defect type of only the defective component is output for each circuit number indicating the position of the defective component for each target board. Furthermore, when a defect occurs for each land or mask, the land or mask number and defect code are output. Therefore, by collecting this data for a plurality of boards in an appropriate period, it is possible to extract a component with a low degree of defect occurrence.

On the other hand, the information of the target board output from the inspection machine is the same as the data at the time of board measurement, the land / mask shape is shown in FIG. 7B, and the mounting condition data used is shown in FIG.
The shape is as shown in FIG. 6B or FIG. Therefore, FIG.
The content of (b) may be registered as it is in the table of FIG. 2 (a). However, the allowable value is additionally input in consideration of quality result data and other similar cell menu shapes.

In this embodiment, the standard design reference information is the design rule based on the scale showing the characteristics of the land and mask shape such as the vertical and horizontal size and area. However, the design reference shape itself is registered and the actual shape and the figure are registered. A method of comparing the shapes by pattern matching may be used.

[0020]

According to the present invention, in the mounting process using the mounting machine for mounting electronic parts and the inspection machine for each process, the land or mask shape information of the target board is obtained from the actual board or CAD data to obtain the standard. By providing a device that compares the design criteria with the design shape of the printed circuit board lands and printing mask holes to be inspected in advance, it is possible to confirm the design quality of the target circuit board before operating it in actual equipment. it can.

This makes it possible to prevent quality defects in advance and improve quality.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a land mask inspection apparatus in a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of standard shape information of a land mask in a storage unit.

FIG. 3 is a diagram showing an example of part shape information.

FIG. 4 is a diagram showing an example of standard design standard information of a storage unit.

FIG. 5 is a diagram showing an example of related information of a part name and a part shape in a storage unit.

FIG. 6 is a diagram showing an example of component mounting position information.

FIG. 7 is a diagram showing an example of land / mask shape information that is input.

FIG. 8 is a diagram showing a configuration of a land mask inspection apparatus in a second embodiment of the present invention.

FIG. 9 is a diagram showing an example of quality inspection data by an inspection machine.

FIG. 10 is a diagram showing a configuration of a conventional land mask inspection apparatus.

[Explanation of symbols]

 1 data input section 2 standard design information storage section 3 shape pass / fail judgment section 4 reading section 5 component center position definition 6 good land / mask selection section 7 data registration section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenichi Sato 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. An electronic component mounting apparatus comprising an apparatus for inspecting a land or a print mask hole shape of a printed circuit board, wherein land or print mask hole shape information of an inspection target board is optically detected from an actual printed circuit board or print mask. A reading unit that reads in, an input unit that inputs the land / mask shape information extracted from the reading unit and the information of the part shape to be used, a storage unit that stores land or printing mask hole design standard information, and design standard information Is included in the storage unit, is compared with the land or print mask hole shape information from the input unit, and outputs the result to determine whether the shape on the target substrate is within the reference or not. Land and printing mask hole design shape inspection device. 2. The storage unit according to claim 1, wherein the storage unit includes a storage region for information on a land or printing mask hole design reference shape, a shape of a corresponding electronic component, and a mounting method condition to be used. Land / print mask hole design shape inspection device. 3. The reading unit has a function of reading CAD design information including a component name of each component on the target substrate and corresponding land or print mask hole design information. The land / print mask hole design shape inspection device according to any one of 1. 4. Based on quality record data from the inspection machine,
It is characterized by comprising a selection unit for selecting a land or print mask hole shape that is a non-defective product, and a registration unit for registering the land and / or print mask hole shape selected by the selection unit and related mounting method condition information in a storage unit. Claim 1 or 2
The land / print mask hole design shape inspection device according to any one of 1.