JPH0721807B2 - Wiring pattern error detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A wiring pattern error detection apparatus, which attempts to detect a pattern that does not satisfy a predetermined gap as a gap error by determining a conductor connection relationship between wiring patterns of the same signal. It is a thing.

[Industrial application field]

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

Generally, on a wiring board, lands that are conductors for connecting pins of mounted components and line segments that electrically connect the lands are formed in a pattern state.

The present invention relates to an error detection method for calculating the relationship between wiring patterns and detecting a gap error when a predetermined condition is not satisfied.

[Conventional technology]

Hitherto, a gap error between wiring patterns used for the same signal has been visually detected by an operator.

That is, the pattern data created in the wiring pattern design stage is used as pattern drawing data in the manufacturing process. In this manufacturing process, a pattern original plate (photographic film) is created from the pattern drawing data,
An error (for example, a pattern short circuit due to a scratch on the film) mixed in the process is detected.

In this case, the operator visually checks each film (single layer, that is, the same layer), and if there is a constant space between the wiring patterns, treats it as a space error.

[Problems to be solved by the invention]

However, conventionally, there are the following problems due to the visual check.

That is, in FIG. 7, L ₁ and L ₂ are land patterns, P ₁ is the first layer, and P ₂ is the line segment pattern of the second layer. In this case, since the signals are the same, originally, the gap error does not substantially exist.

However, in the visual check of the first layer, the gap error E is detected even in the case of FIG. Therefore, there is a problem that the substrate is processed as having a gap error even though the gap error should not have originally occurred. In addition, as shown in FIG. 7, the connection between the line segment pattern P ₁ and the land pattern L ₂ is L _{1 of} another layer.
A connection form that is performed via a connection pattern between L _{2 and} L ₂ is referred to as “indirect connection”. On the other hand, the connection between the wiring patterns on the same layer is not regarded as an error,
A connection form that is directly performed is referred to as "direct connection".

[Means for solving problems]

An object of the present invention is to solve the above-mentioned problems and to accurately detect a gap error in a wiring pattern. From another point of view, a pattern that causes an error by visual inspection can be reliably detected as an error and designed. To urge the person to correct the pattern.

As shown in FIG. 1, the means first calculates the pattern gap (), then, if the value is within a predetermined range, checks whether or not it is a line segment for direct connection, and checks the pattern P and the land L. Is not connected and the distance d between the pattern P and the land is within the specified value (Fig. 5), or the thin line pattern with an interior angle of 90 ° or less (Fig. 6 (A)) is not considered as direct connection. Is displayed in the error list or display as a gap error (). Therefore, according to the present invention, there is provided a wiring pattern error detection device for detecting a gap error between a land and a line segment pattern of the same signal, in which each table configured by information about the land and the line segment for each layer is stored in advance. And a calculation unit for performing a determination process of whether or not the land pattern and the line segment pattern, which are the object of the wiring pattern error detection, are directly connected based on each table described above. The arithmetic unit is a unit that measures a gap between the land pattern and the line segment pattern, and a unit that determines whether the land pattern and the line segment pattern are directly connected when the gap is less than a predetermined value. And a wiring pattern error detection device having means for giving a display instruction as a gap error when the connection is not direct connection. It is subjected.

[Action]

As described above, according to the present invention, it is possible to display an error when a certain gap condition is not satisfied by calculating the connection relationship between the same signal patterns. Errors can be detected more accurately. In other words, from another point of view, it is possible to prompt the designer to correct the pattern by displaying an error in order to prevent the pattern that is caught by the visual check in the design stage.

〔Example〕

Hereinafter, the present invention will be described by way of examples 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 unit 2.

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

The calculation unit 2 is composed of a CPU 21, a memory 22, and a check processing unit 23, and performs a pattern gap check to detect a pattern gap error.

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

The error list 3 is a list of gap errors detected by the CPU 21.

Next, the configuration 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 described with reference to FIG.

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

The land table (Fig. 3 (A)) is a land L (5th
Information) and is a square in this embodiment for simplification. The coordinates show the position of the center point of the square, and D ₁ , D ₂ , ... Show 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 coordinate indicates the sequence number of the table, and the second suffix indicates the start point and end point of the line segment pattern. For example, (X ₁₁ ,
Y ₁₁ ) indicates the coordinates of the first start point, and (X ₁₂ , Y ₁₂ ) indicates the coordinates of the first end point.

W ₁ ,, W ₂ , W ₃ ... are the widths of the _1st , _2nd , _3rd , ... th line segment patterns, respectively, and L ₁ , L ₂ , L ₃ ... It indicates that it is the layer number of the pattern. The same layer pattern line segment table (FIG. 3 (C)) is obtained by editing only the same layer segment from the line segment table (FIG. 3 (B)).

The operation of the apparatus of FIG. 2 having the above structure will be described below with reference to FIGS. 4 to 6.

As shown in FIG. 4, the processing flow of the present invention is divided into FIG. 4A (No. 1) and FIG. 4B (No. 2).

First, the land table (FIG. 3A) and the line segment table (FIG. 3B) from the pattern file 1 (FIG. 2) are input to the memory 22, and the same layer pattern line segment table (FIG. 3 (C)) is edited and the gap between the land and the line segment in the same layer is calculated (). That is, in this embodiment, the land table is common to each layer (FIG. 3 (A)). Therefore, while comparing the land table and the same layer pattern line segment table (FIG. 3C) for each layer,
The shortest distance d between the land pattern and the line segment pattern is calculated from each coordinate value. The shortest distance d is obtained, for example, by calculating the length of a line segment that is orthogonal to the land pattern L and the line segment pattern P (fifth aspect).
Figure).

In this case, the direct connection flag DCF is reset (DCF = 0).

Next, if the gap distance d is larger than 0 and smaller than a predetermined specified value, another line segment LINE2 connected to LINE1 is searched ().

In FIG. 4A, the determination of LINE1 = LINE2 is a step for avoiding the connection check with LINE1 itself.
If the two line segment patterns are equal (LINE1 = LINE2), move to the next process () and move to the next line (LINE2 = LINE2 + 1)
Check the connection with.

If LINE1 and LINE2 are connected, check the connection between LINE2 and land, and if both are connected, set the direct connection flag to 1 (DCF = 1).
Then, the connection is checked by the land table and the same layer pattern line segment table.

In this case, the line widths of the two line segment patterns are calculated, and if both exceed the specified value, direct connection is made (),
A gap error is displayed (Fig. 4B).

If at least one of the line segment patterns has a prescribed line width or less, that is, if it is a thin line pattern as shown in FIG.
If the minimum angle formed by the two line segment patterns is calculated and it is less than 90 °, it is not considered as direct connection (Fig. 6 (A)). The minimum angle between the land pattern and line segment pattern is 90.
If it is less than °, it is not considered as a direct connection.

In these cases, an angle error is displayed and a conductor gap error is listed on the error list 3 and the DCF
= 0 (). However, in other cases, for example, the sixth
If the minimum angle α ₄ formed by the two line segment patterns and the minimum angle α ₅ formed by the land and the line segment patterns exceed 90 °, as shown in FIG.

In this way, if the processing of the first layer is completed (),
Next, the processing for the second layer and thereafter is performed based on each table (FIG. 3) input to the memory 22 according to the flow of FIGS. 4A and 4B.

〔The invention's effect〕

As described above, according to the present invention, it is possible to display an error when a certain gap condition is not satisfied by calculating the connection relationship between the same signal patterns. Errors can be detected more accurately. In other words, from another point of view, it is possible to prompt the designer to correct the pattern by displaying an error in order to prevent the pattern that is caught by the visual check in the design stage.

[Brief description of drawings]

FIG. 1 is a principle diagram 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 processing flow relationship according to the present invention. FIG. 4A is a diagram showing a processing flow of the present invention (No. 1), FIG. 4B is a diagram showing a processing flow of the present invention (No. 2), and FIG. 6) is an operation explanatory diagram of the present invention (in the case of a fine line pattern), and FIG. 7 is an explanatory diagram of a conventional technique. 1 ... Pattern memory, 2 ... Calculation section, 3 ... Error list, 21 ... CPU, 22 ... Memory, 23 ... Check processing section.

Claims (1)

[Claims] 1. A wiring pattern error detecting device for detecting a gap error between patterns of lands and line segments of the same signal, wherein each table constituted by information on lands and line segments for each layer is stored in advance. Pattern File (1)
And a computing unit (2) for performing a process of determining whether or not the land pattern and the line segment pattern, which are the objects of the wiring pattern error detection, are directly connected based on the respective tables. The calculation unit (21) for measuring the gap between the land pattern and the line segment pattern, and when the gap is less than a predetermined value, determines whether or not the land pattern and the line segment pattern are directly connected. A wiring pattern error detecting device comprising: means (21); and means (21) for giving a display instruction as a gap error when the connection is not direct.