JP2867522B2 - Display device for circuit connection information - Google Patents

Description

The present invention relates to a circuit connection information display device, and more particularly to a layout screen of a wiring board pattern using a CAD system.

[Conventional technology]

Conventionally, as a display device of this type, as shown in FIG. 4, a plurality of component land data 9 are temporarily arranged on a board data 8 and their circuit connection information is used as a land to be connected to each other. A method of connecting the lines with a straight line 10 allowing an arbitrary inclination has been used.

[Problems to be solved by the invention]

However, in the conventional circuit connection information display device described above, lands to be connected to each other are connected by a straight line 10 allowing an arbitrary inclination. However, there is a drawback that when optimizing the arrangement, a highly accurate determination cannot be made. In an actual wiring pattern, 0 °, 90 °, 180 °,
In general, it is generally allowed to route only in eight directions of 270 ゜, 45 ゜, 135 ゜, 225 ゜, and 315 ゜. Therefore, a straight line with an arbitrary inclination is used as a display function of circuit connection information. Is sufficient, but there is a drawback that it is difficult to assign a width to this data and use it as a wiring pattern.

An object of the present invention is to provide a display device for circuit connection information which solves the above-mentioned drawbacks and can be easily used as a wiring pattern.

[Means for solving the problem]

The configuration of the circuit connection information display device of the present invention is such that the shortest route is initially set so that both lands to be connected to each other are connected by a polygonal line whose inclination is drawn in 45 ° units. And the broken line along the shortest path obtained by combining the outline of the virtual rectangle having two vertices at the center of the two lands and one line segment having an inclination of 45 ° or 135 °. Features.

〔Example〕

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

FIG. 1 is a plan view showing a circuit connection information display device according to one embodiment of the present invention. In FIG. 1, the circuit land information 2 provisionally arranged in the area of the board outline data 1 is connected by a polygonal line 3 composed of a line segment whose inclination is drawn in units of 45 °. It is displayed.

A specific routing algorithm is shown in FIG. 3 (b).

FIG. 3 (a) is a plan view showing board outline data of the algorithm of FIG. 3 (b).

In FIGS. 3A and 3B, first, two land centers to be processed are selected, and points A and B are identified. In the case of the present embodiment, the side closer to the substrate center O point in process 10 is A
Point and the other point B. Next, in process 11, this A,
Assuming a rectangle with point B as the diagonal and two vertices, the center is G
Point. Here, in processes 12 and 13, the inclination 45 passing through A and B is used.
The points at which the straight line of ゜ or 135 ° intersects the rectangle are C and D, respectively, and in processing 14, the point closest to A among the four points at which the straight line of 45 ° or 135 ° passing through point G intersects with the rectangle Let E be the point closest to B and F be the point closest to B to define the three shortest paths (processes 15, 16, 17) of ACB, ADB, and AEFB. Which of these paths to display is selected by setting a mode in advance. The above route determination processing is performed for all lands to be connected to each other and displayed. In addition, it is needless to say that processing for partial movement or rotation of a part position is performed only between lands related to this part. In this case, the time required for redisplay is at most about 2 to 3 seconds.

The above embodiment shows a case where the display is performed in the route ACB mode.

FIG. 2 is a plan view showing a display device for circuit connection information according to another embodiment of the present invention. In the present embodiment, unlike the above-described embodiment, the polygonal line 6 is displayed in the mode of the route AEFB of FIG. 3B. In the present embodiment, since the route does not depend on the processing from the substrate center O and is also a target for the points A and B, there is no bias of the route itself, and the degree of incorporation of the wiring can be more accurately determined. There is an advantage that you can judge.

As described above, according to the embodiment of the present invention, the circuit connection information between the component land data is visually displayed on the screen based on the netlist database constructed automatically by automatically extracting from the circuit diagram or directly reading the file. In a CAD system for wiring board pattern layout that has the function of displaying on a board, the circuit connection information connects land data to be connected to each other with broken lines composed of line segments with a pull-in angle of 45 °. Is displayed.

〔The invention's effect〕

As described above, according to the present invention, the display of the circuit connection information at the time of arranging components is changed from a conventional configuration in which a straight line allowing an arbitrary inclination is connected to a display in which the pull-in angle is connected by a broken line in units of 45 °. This has the effect that the difference from the actual wiring pattern is reduced, and the operator can make a highly accurate determination when optimizing the arrangement.

Further, in the present invention, since the angle constraint is common to the actual pattern, the polygonal line itself can be easily deformed by a relatively easy-to-operate command such as parallel movement of a line segment or addition of a bending point. There is an effect that it is possible to easily use the actual pattern as it is by performing the width setting process.

Further, the present invention has an effect that it can be a particularly effective means as a layout system for a hybrid IC substrate that often handles small-scale circuits manually.

[Brief description of the drawings]

FIG. 1 is a plan view showing a circuit connection information display device according to one embodiment of the present invention, FIG. 2 is a plan view of another embodiment of the present invention, and FIG. 3 (a) is FIGS. FIG.
FIG. 2B is a flowchart showing the processing procedure of FIGS. 1 and 2, and a plan view showing a conventional display of FIG. 1,7,8 …… board outline data, 2,9 …… part land data,
3,6 ... A polygonal line with a 45 ° angle of pull-in, 10 ... A straight line allowing any inclination, A, B ... Central points of component land data to be connected to each other, C, D, E, F …… Bend point of polygonal line, G ………………………………………………………………….
...... The center of the board data.

Claims (1)

(57) [Claims] 1. A method according to claim 1, wherein two lands to be connected to each other are connected.
In the initial setting, each inclination is connected by a polygonal line drawn in 45 ° units, and the contour of the virtual rectangle having two diagonal vertices at the center of both lands, which is the shortest route, and the inclination of 45 ° or A display device for displaying circuit connection information, which is represented by a polygonal line along the shortest path obtained by combining one 135 ° line segment.