JPH03219370A - Dummy pattern generation system - Google Patents

Abstract

PURPOSE:To uniformize the density of a wiring pattern on a wiring board by calculating the density of the wiring pattern and generating a dummy pattern based upon wiring information generated on a low density area. CONSTITUTION:The wiring length of the wiring pattern 7 in a wiring area 5 is calculated in each divided wiring area 6, the calculated length is divided by the area of the divided wiring area 6 to calculate the wiring density of each area 6. The calculation accuracy of the wiring density can be improved by increasing the number of areas 6 and thinning the divided areas. In order to increase the wiring density of respective areas 6 up to the same level as that of the area 6 having the highest wiring density, the number of pin pairs and the average pin pair length are calculated by using unused sheets 8 in each area 6 and connection information is automatically generated. Then, the sheets 8 in each area 6 are connected based upon the automatically generated connection information to generate a dummy patterns 9. Consequently, the density of the wiring pattern can be uniformized and the quality of design can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a dummy pattern generation method, and particularly to a dummy pattern generation method in wiring design of a wiring board.

[Conventional technology]

Conventionally, in this type of wiring board, the part used for wiring and the part not used for wiring tend to be relatively separated, and the part used for wiring has a high wiring pattern density. There is a large difference in wiring pattern density.

If there is a large difference in the density of the wiring patterns on the wiring board, the thickness of the plating during the manufacturing plating process will be extremely different, and the thickness of the insulation formed on the wiring pattern will be non-uniform.

For this reason, manufacturing defects are likely to occur, resulting in a significant decrease in manufacturing yield.

As a conventional technique for ensuring manufacturing yield, there is a method in which dummy patterns are created manually to equalize the density of wiring patterns on a wiring board.

[Problem to be solved by the invention]

In the conventional dummy pattern creation method described above, the dummy patterns are designed manually, so (1) it is difficult to make the density of the wiring pattern uniform;

(2) It is difficult to ensure the quality of the design.

(3) It takes time to design.

There are drawbacks such as.

[Means to solve the problem]

The dummy pattern generation method of the present invention includes means for calculating the density of wiring patterns on a wiring board, means for generating wiring information in areas with low wiring pattern density, and generating a dummy pattern based on the generated wiring information. and the means to do so.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a flowchart showing the processing operation of a dummy pattern generation method according to an embodiment of the present invention. In FIG. 1, one embodiment of the present invention has a dummy pattern generation system consisting of a wiring pattern density calculation section in a processing box 1, a connection information generation section in a processing box 2, and a dummy pattern generation section in a processing box 3. are doing.

FIG. 2 is an image diagram before dummy pattern generation according to an embodiment of the present invention. In this embodiment, a wiring area 5 is provided on a wiring bag 4, and the wiring area 5 is formed by a virtual dividing line 10.
It is divided into divided wiring regions 6 by. The wiring pattern 7 is wired within the wiring area 5 and is connected to the seat 8.

FIG. 3 is an image diagram after the dummy pattern is generated according to an embodiment of the present invention. A wiring region 5 is provided on the wiring board 4 , and the wiring region 5 is divided into divided wiring regions 6 by virtual dividing lines 10 . The wiring pattern 7 and the dummy pattern 9 are wired within the wiring region 5, and both are connected to the seat 8.

The processing operation of an embodiment of the present invention will be explained using FIGS. 1 to 3.

First, in FIG. 2, the wiring length of the wiring pattern 7 in the wiring area 5 is calculated for each dividing line area 6, the quotient is taken by the area of the dividing wiring area 6, and the wiring density is calculated for each dividing wiring area 6. In FIG. 2, the divided wiring region 6 is divided into nine regions, but by increasing the number of divided wiring regions 6 and making the divided regions finer, the precision in calculating the wiring density can be improved. (Processing Box 1 in Figure 1) Next, fill in the unused seats 8 in each divided wiring area 6 so that the wiring density is the same as that of the divided wiring area 6 with the highest wiring density.
The number of bin pairs and average pin pair length are calculated using , and connection information is automatically generated. (Processing box 2 in FIG. 1) Next, in FIG. 3, the seats in each divided wiring area 6 are connected based on the automatically generated connection information to form a dummy pattern 9.
occurs. (Processing Box 3 in Figure 1) [Effects of the Invention] As explained above, the present invention provides a means for calculating the density of a wiring pattern, a means for generating wiring information of a region with a low density of wiring patterns, and a means for calculating the density of a wiring pattern. By having a means for generating a dummy pattern based on the wiring information, it is possible to equalize the density of the wiring pattern on the wiring board and to ensure the yield during manufacturing.

FIG. 3 is a diagram showing an image after a dummy pattern is generated according to an embodiment of the present invention.

1-3... Processing box, 4... Wiring board, 5...
・Wiring area, 6... Divided wiring area, 7... Wiring pattern, 8... Seat, 9... Dummy pattern, 10...
・Virtual dividing line.

Claims (1)

[Claims] means for calculating the density of a wiring pattern on a wiring board;
A dummy pattern generation method comprising: means for generating wiring information for a region with low wiring pattern density; and means for generating a dummy pattern based on the generated wiring information.