JPS62119692A - Wiring pattern error detecting system - Google Patents

Abstract

PURPOSE:To detect more correctly a clearance error by calculating the connecting relation between the same signal patterns, displaying as the error when constant clearance conditions are not satisfied, and comparing with the visual checking. CONSTITUTION:First, when the pattern clearance is calculated and next, the value is in the prescribed scope, it is checked whether or not the line segment is the one to connect directly, and when a pattern P and a land are not connected, a clearance (d) between the pattern P and the land is within the specified value and the fine line pattern with an inner angle of <=90 deg. and so on are not considered as the direct connection, the error is displayed on an error list 3 or a display. Thus, by calculating the connecting relation between the same signal patterns, constant clearance conditions are not satisfied, and then, by displaying as an error, the visual checking is compared and the clearance error can be detected more correctly.

Description

[Detailed Description of the Invention] [Summary] This is a wiring pattern error detection method that attempts to detect patterns that do not fill a predetermined gap as a gap error by calculating the conductor relationship between identical signal patterns. It is something.

[Industrial application field]

The present invention relates to a wiring pattern error detection method.

Generally, lands, which are conductors for pin connections of mounted components, and line segments that electrically connect the lands are formed in patterns on a wiring board.

The present invention relates to an error detection method that calculates the relationship between wiring patterns and detects a gap error if a predetermined condition is not met.

[Conventional technology]

Previously, gaps between wiring patterns used for the same signal had to be detected visually by workers.

That is, in the inspection process, an operator visually inspects the printed wiring board from above and, if a certain gap exists, treats it as a gap error.

[Problem that the invention seeks to solve]

However, conventional visual checks have had the following problems.

That is, in FIG. 7, L and L2 are land patterns,
Let Pl be the line segment pattern of the first layer, and P2 be the line segment pattern of the second layer. In this case, since the signals are the same, there is essentially no gap error.

However, when visually checking the first layer, a gap error E is detected even in the case shown in FIG. Therefore, there is a problem in that the substrate is treated as having a gap error even though the gap error does not originally occur in the substrate.

[Means for solving problems]

An object of the present invention is to solve the above problems and accurately detect gap errors in wiring patterns.

As shown in Figure 1, the method is to first calculate the pattern gap (■), and then, if the value is within a predetermined range, check whether there is a line segment to be directly connected and connect the pattern P and the land. If it is not considered to be a direct connection, such as when the distance d between the pattern P and the land is within the specified value (Fig. 5) or a thin line pattern with an internal angle of 90° or less (Fig. 6 (8)), ■), displayed as a gap error on the error list or display (■).

[For production]

As described above, according to the present invention, by calculating the connection relationship between the same signal patterns, if a certain gap condition is not met, it can be displayed as an error. Errors can now be detected more accurately.

〔Example〕

The invention will now be explained by way of example with reference to the accompanying drawings.

FIG. 2 is a diagram showing an embodiment of the present invention. The apparatus shown in FIG. 2 is composed of a pattern file 1 and a calculation section 2.

The pattern file 1 stores a table of information regarding lands and line segments in various wiring pattern connection states.

The calculation section 2 includes a CPU 21, a memory 22, and a check processing section 23, and performs a pattern gap check to detect pattern gap errors.

The CPU 21 calculates the conductor gap between the same signal patterns based on the table in the memory 22, and detects a pattern that does not satisfy a predetermined gap as a gap error.The memory 22 stores the land table and line segment table from the pattern file 1. Enter. The check processing unit 23
A program used for the above calculation is stored.

Error list 3 is a restoration of gap errors detected by the CPU 21.

Next, a configuration diagram of the memory used in the present invention, that is, the configuration of the table input from the pattern file 1 to the memory 22 will be explained based on FIG.

FIG. 3(A) shows a land table, FIG. 3(B) shows a line segment table, and FIG. 3(C) shows a same layer pattern line segment table.

The land table (FIG. 3 (8)) is information regarding the land L (FIG. 5), and is square in this embodiment for simplicity. The coordinates indicate the position of the center point of the square, and D++Dz+... indicate the length from the center point of the square to each side.

The line segment table (FIG. 3(B)) is information regarding the line segment pattern P (FIG. 5).

In FIG. 3(B), the first suffix of the coordinates indicates the order number of the table, and the second suffix indicates the starting point and ending point of the line segment pattern. For example, (X+
+, Yz) is the coordinate of the first starting point, (XI2.
Yl. ) respectively indicate the coordinates of the first end point.

W+, Wz, Wy... are the widths of the 1st, 2nd, 3rd... line segment patterns, respectively, and L+, L
2. Ls... are the 1st, 2nd, 3rd, and 3rd, respectively. . . . indicates the layer number of the th pattern. The same layer pattern line segment table (FIG. 3(C)) is obtained by editing only the same layer bones from the line segment table (FIG. 3(B)).

Hereinafter, the operation of the apparatus shown in FIG. 2 having the above configuration will be explained based on FIGS. 4 to 6.

As shown in FIG. 4, the processing flow of the present invention is shown in FIG. 4A (
It is divided into Part 1) and Figure 4B (Part 2).

First, from pattern file 1 (Figure 2), the land table (Figure 3 (A)) and line segment table (Figure 3 (B)) are created.
is input into the memory 22, and the same layer pattern line segment table (Figure 3 (C)) is created for each layer.
) and calculate the gap between lands and line segments on the same layer (■). That is, in this embodiment, the land table (FIG. 3(8)) is commonly constructed for each layer. Therefore, while comparing the land table and the same layer pattern line table (FIG. 3(C)) for each layer, the shortest distance d between the land pattern and the line segment pattern is calculated from the respective coordinate values. This shortest distance d can be found, for example, by calculating the lengths of line segments perpendicular to the land pattern L and the line segment pattern P (FIG. 5).

In this case, reset the direct connection flag DCF (DCF=O).

Next, if the gap distance d is greater than 0 but smaller than a predetermined value, it is checked that there is no single-tree line that directly connects the two patterns (■).

That is, if the two line segment patterns are equal (LINE1
=LINE2) This is a line segment pattern with only one tree, so move on to the next process (■). If it is not a one-tree line segment pattern, the connection relationship is checked, and if it is connected, the direct connection flag is set to 1 (DCF=1). and,
The connection is checked using the land table and the same layer pattern line segment table.

In this case, calculate the line widths of the two line segment patterns, and if both exceed the specified value, connect directly.
Gap error is not displayed (4th B).

If at least one line segment pattern is less than the specified line width, that is, if it is a thin line pattern as shown in FIG.
Find the minimum angle formed by the two line segment patterns, and if it is less than 90°, it is not considered a direct connection (Figure 5 (8)). Also, the minimum angle between the land pattern and the line segment pattern is 90
“The following cases are also not considered direct connections.

In these cases, an angle error is displayed and the error is listed in error list 3 as a conductor gap error (■). However, in other cases, for example, Figure 6 (■3)
As shown in , the minimum angle α4 between two line segment patterns and the minimum angle α between a land and a line segment pattern are 9, respectively.
If it exceeds 0", it is considered a direct 1 concubine.

In this way, once the treatment of the first layer is completed (◎),
Next, second layer 1] and the following processes are performed based on each table (FIG. 3) input to the memory 22 according to the flowcharts of FIGS. 4A and 4B.

〔Effect of the invention〕

As described above, according to the present invention, by calculating the connection relationship between the same signal patterns, if a certain gap condition is not met, it can be displayed as an error. Errors can now be detected more accurately.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing an embodiment of the present invention, FIG. 3 is a configuration diagram of a memory used in the present invention, and FIG. 4 is a diagram showing the relationship of the processing flow according to the present invention. Figure 4A
4B is a diagram showing the processing flow of the present invention (Part 2), FIG. FIG. 6 is an explanatory diagram of the operation of the present invention (in the case of a thin line pattern), and FIG. 7 is an explanatory diagram of the prior art. 1... Pattern memory, 2... Arithmetic unit, 3...
Error list, 21...CPU. 22...Memory, 23...Check processing section. Principle of the invention Diagram showing an embodiment of the invention Figure 4 is a diagram showing the relationship between processing flows. Figure 4 is an explanatory diagram of the operation of the present invention (in the case of an acute angle connection). Figure 5 is an example of no direct connection (A). An example of direct connection (B). case) Figure 6

Claims (1)

[Claims] In a wiring pattern error detection method for detecting gap errors between patterns of lands and line segments of the same signal, a table constituted by information regarding lands and line segments for each layer stored in a pattern file is provided. The calculation unit judges whether or not the above land pattern and line segment pattern are directly connected based on the above two tables, and displays it as a gap error if it is not a direct connection. Features a wiring pattern error detection method.