JPH053035B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] When creating coordinate data of a wide-area pattern using a computer-aided design device (hereinafter referred to as CAD), it is necessary to indicate the net portions constituting the circuit within the desired wide-area pattern. By providing a coordinate data creation means that creates coordinate data with at least the necessary conductor-free spacing between the conductor patterns around the coordinate data, and by simply inputting the coordinate data of the wide area pattern data creation range, the wide area pattern can be created. By making it possible to create coordinate data, it is possible to greatly reduce the effort involved in creating wide area pattern data.

[Industrial application field]

The present invention uses CAD to construct circuits such as already stored outer frame coordinate data of a printed circuit board, lands, vias (conductor patterns on the surface of a printed circuit board with through-holes for double-sided connection), and lines. A computer-aided design for creating coordinate data of a wide-area pattern having at least the necessary conductor-free spacing between conductor patterns around the net portion constituting the circuit in the wide-area pattern using coordinate data indicating a net part. Concerning improvements to equipment.

Wide-area patterns are used on printed circuit boards, such as in wide-area conductor patterns for power supply (which may include internal circuitry) to reduce voltage drop, and to prevent noise generation. For this reason, it is used when forming a conductor pattern that is grounded all over except for the net part that makes up the circuit.

Even if the lands and vias are at ground potential and the wide-area pattern is grounded, in order to ensure good soldering, the areas around the lands and vias should be punched out to create a non-conductor area with the required spacing between the conductor patterns. There is.

It is desirable that the method for creating the wide-area pattern data requires less effort.

[Problems to be solved by conventional technology and invention]

Conventionally, as shown in FIG. 10, for example, there is a land 50 with a conductor portion around the hole into which the component is inserted, and when trying to create a wide-area pattern with this land inside, the tablet 2 shown in FIG. , while looking at the land 50 displayed on the display device 3, calculate the coordinates for creating a non-conductor part with the required spacing between conductor patterns around the land 50 and the coordinates of the outer shape of the wide area pattern data creation range. ,
Must be hit on Tablet 2.

To create coordinate data for a wide-area pattern, perform this operation over the entire wide-area pattern data creation area, and then check for intersections, near misses, etc. between the net parts that make up the circuit and the wide-area pattern. Check and if there is an error, you will have to re-enter the wide area pattern data for that part.
A problem has arisen in that it takes time and effort to create wide-area pattern coordinate data.

The present invention was made in view of the above points, and an object of the present invention is to provide a computer-aided design device that can create coordinate data of a wide area pattern by simply inputting wide area pattern data creation range coordinate data. There is.

[Means for Solving the Problems] FIG. 1 shows a basic block diagram of the computer-aided design apparatus of the present invention.

As shown in Figure 1, the outer frame coordinate data of the printed circuit board, the coordinate data showing the net parts such as lands, vias, and lines that make up the circuit, the necessary spacing without conductors between conductive patterns, and the formation of a wide area pattern. When inputting wide-area pattern data creation range coordinate data indicating the range for creating coordinate data of a wide-area pattern in the computer-aided design device 60 that stores the minimum width to be created, the computer-aided design device 60 stores the minimum width of the wide-area pattern. A reading means 62 for reading the coordinate data and a matrix lattice divided by the minimum width that forms a wide area pattern are created within the creation range coordinate data, and all the net parts are divided between the conductor patterns from their own size. A matrix unit element whose size extends to the center of the matrix unit element is created by adding 1/2 of the minimum width that forms a wide area pattern in addition to the spacing without conductors. A closed loop is created by tracing the center point of the matrix unit element that can generate a wide area pattern along the matrix unit element that is not allowed to generate a wide area pattern, and the matrix unit element that cannot generate a wide area pattern is located outside the closed loop. When it is inside, the closed loop is expanded by 1/2 of the minimum width that forms a wide area pattern, and when it is inside, the closed loop is created and expanded by 1/2 of the minimum width that forms a wide area pattern. If so, use the coordinate data outside the wide area pattern,
In the case of reduction, the coordinate data creation means 6 sets the wide area pattern data creation range coordinate data as the inner coordinate data of the wide area pattern, which is the outer coordinate data.
1.

[Effect]

According to the present invention, when wide-area pattern data creation range coordinate data is input, the reading means 62 reads the coordinates indicating the net part within the creation range coordinate data, and the coordinate data creation means 61 reads the creation range coordinates. Create a matrix lattice in the data separated by the minimum width that forms a wide-area pattern, and add all net portions from their own size to the required conductor-free spacing between conductor patterns to form a wide-area pattern. A region expanded to the size of 1/2 of the minimum width is created, and a matrix unit element in which the region extends to the center of the matrix unit element is prohibited from generating a wide area pattern, and a matrix is created in which a wide area pattern cannot be generated. A closed loop is created by tracing the center point of a matrix unit element that can generate a wide area pattern along the unit element, and when a matrix unit element that cannot generate a wide area pattern is outside the closed loop, the closed loop is used to form a wide area pattern. When it is inside, create a closed loop that is reduced by 1/2 of the minimum width that forms a wide area pattern, and when it is expanded, use it as coordinate data for the outside of the wide area pattern, When reduced, the wide area pattern data creation range coordinate data will be the inner coordinate data of the wide area pattern whose outer coordinate data is the outer coordinate data, so just by inputting the wide area pattern data creation range coordinate data, you can create the wide area pattern coordinate data. can be obtained, and the effort of creating wide-area pattern data can be greatly reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 2 is a block diagram of an example of CAD, Fig. 3 is a flowchart of a program of the coordinate data creation means of the embodiment of the present invention, Fig. 4 is a diagram showing an example of matrix generation, and Fig. 5 is a diagram of a region. Enlarged explanatory diagram, No. 6
The figure shows an example of the flow of creating a wide area pattern, and Figure 7 is a diagram showing the flow of creating a wide area pattern when the lines are on the matrix grid lines.
FIG. 8 is a diagram showing a net portion constituting an example of a circuit, and FIG. 9 is a diagram showing an example of a wide area pattern.

The magnetic disk 5 of the CAD shown in FIG. When displayed, for example, a net portion forming a circuit as shown in FIG. 8 is displayed.

The memory 4 stores a program for the coordinate data creation means shown in FIG. The reading means 62 reads data indicating the net portion within the wide area pattern data creation range coordinate data from the magnetic disk 5, reads out the coordinate data creation program 61, and causes processing to be performed according to this program.

Note that 6 is a magnetic disk for storing completed wide area pattern data, and 7 is a RAM.

The contents of the coordinate data creation program 61 are as described below.

So that the normal land and via positions are centered.
Generates a matrix lattice separated by the minimum width that forms a wide-area pattern, and adds the necessary conductor-free spacing between conductor patterns to the net portions that make up the circuit from their own size to form a wide-area pattern. 1/2 of the minimum width
An enlarged region is created, and the unit element of the matrix in which this region extends to the center of the unit element of the matrix is made to be unable to generate a wide area pattern. Trace the center point of the unit element of the matrix that can generate a pattern to create a closed loop, and when the unit element of the matrix that cannot generate a wide area pattern is outside the closed loop, 1/2 of the minimum width that forms the wide area pattern. When it is enlarged and inside, it creates a closed loop that reduces the width by 1/2 of the minimum width that forms a wide area pattern. Area pattern data creation range coordinate data is coordinate data inside a wide area pattern whose outer coordinate data is outer coordinate data.

The operation will be explained in detail below according to the program shown in FIG.

First, in step 11, a matrix is created.

In creating this matrix, the spacing between lands and vias is usually 1 inch, for example, and the minimum width for forming a wide area pattern is 1/2 inch. Form a matrix grid centered at the via location and separated by 1/2 inch.

Note that the x mark indicates the center of the matrix unit element.

Next, in step 12, the net portions constituting the circuit, such as lands, vias, and lines, are enlarged.

This enlargement is, for example, from the land 51 and line 52 in FIG.
The matrix is expanded by 1/4 inch, for example, 1/2 of the matrix lattice spacing (minimum width for forming a wide area pattern).

Figures 6 and 7 show the lines and the enlarged rectangular frames formed by the lines and the overlapping matrix grids.
The result will be as shown in A in the figure.

Note that the net parts that make up the circuit, such as lands, vias, and lines, may not be provided at standard intervals.
FIG. 7 shows the case where the lines are on the matrix grid lines.

Here, expanding the matrix lattice spacing by 1/2 means that, for example, if the width of the line is 0.15 inch and the gap a without conductor is 0.1 inch, then this line will be expanded on the matrix lattice line as shown in Figure 7A. If there is, just widening the gap a by 0.1 inch (0.175 inch, with 1/4 inch to the center) will not reach the center of the unit element of the matrix where you want to prevent wide area patterning, so be sure to This is to make it impossible to generate a wide area pattern using this matrix unit element. Next, in step 13, check whether the center of the matrix is in the enlarged area, and check whether the center of the matrix is located in the enlarged area.
1, 32-45, 46-49, in step 14, the unit element of the matrix with the center is made incapable of generating a wide area pattern.

The operations in steps 12 to 14 above are performed over the entire wide area pattern outer coordinates.

Next, in step 15, it is checked whether there is a unit element that can generate a wide area pattern, and if there is, in step 16, a matrix is created that does not allow the generation of a wide area pattern, as shown in FIGS. A closed loop is created by following the center of the unit element capable of generating a wide-area pattern, indicated by a circle, along the unit element.

Next, in step 17, check whether the closed loop constitutes the outline of the wide area pattern and
As shown on the right of
2 Create an expanded closed loop.

If the inner side is to be formed as shown on the left side of FIG. 6C and FIG.

The above operations from steps 15 to 19 are performed throughout the wide area pattern data creation range coordinates.

Next, in step 20, for example, Figure 6D, Figure 7
The coordinates of the points indicating enlarged or contracted closed loops shown as black dots in Figure D are collected throughout the wide area pattern data creation range coordinates, and in step 21, the coordinates of the points indicating the enlarged or contracted closed loops shown as black dots in Figure D are collected, and in step 21, the coordinates of the points indicating the expanded or contracted closed loops are collected together with the wide area pattern outer shape coordinate data as shown in Figure 2. Register on disk 6.

In this way, by simply inputting the wide-area pattern data creation range coordinate data from the tablet 2 in FIG. 2, it is possible to obtain accurate coordinate data for a wide-area pattern as shown in FIG. 9, for example. It is possible to greatly reduce the effort required to create wide area pattern data.

〔Effect of the invention〕

As explained in detail above, according to the present invention, the coordinate data of a wide area pattern on a printed board can be
When creating large-area pattern data using , error-free data can be generated simply by inputting wide-area pattern data creation range coordinate data, which has the effect of greatly reducing the effort required to create wide-area pattern data.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the principle of the present invention, Figure 2 is 1
3 is a flowchart of the program of the coordinate data creation means of the embodiment of the present invention, FIG. 4 is a diagram showing matrix generation in an example, FIG. 5 is an explanatory diagram of enlarged area, Figure 6 is a diagram showing the flow of creating a wide area pattern as an example, Figure 7 is a diagram showing the flow of creating a wide area pattern when the lines are on the matrix grid lines, and Figure 8 is a diagram showing the configuration of an example circuit. A diagram showing the net part, Figure 9 is 1
FIG. 10, which is a diagram showing an example of a wide area pattern, is an explanatory diagram of creating wide area pattern data in a conventional example. In the figure, 1 is a processor, 2 is a tablet, 3 is a display device, 4 is a memory, 5 and 6 are magnetic disks, 7 is a RAM, 60 is a computer-aided design device, and 61 is a coordinate data creation means.

Claims (1)

[Claims] 1. Memorize the outer frame coordinate data of the printed circuit board, the coordinate data indicating the net parts such as lands, vias, and lines that constitute the circuit, the necessary conductor-free spacing between conductor patterns, and the minimum width to form a wide-area pattern. In the computer-aided design device 60,
When wide area pattern data creation range coordinate data indicating the range for creating coordinate data of a wide area pattern is input, a reading means 62 reads out coordinate data indicating a net portion within the creation range coordinate data; To do this, create a matrix lattice separated by the minimum width that will form a wide-area pattern, and then divide the entire net section from its own size to the minimum width that will form a wide-area pattern in addition to the necessary conductor-free spacing between the conductor patterns. A matrix unit element in which a region expanded to the size of 1/2 of the matrix unit element is created, and the matrix unit element in which the region extends to the center of the matrix unit element is not able to generate a wide area pattern. A closed loop is created by tracing the center point of a matrix unit element that can generate a wide area pattern along The small width is expanded by 1/2, and when it is inside, the closed loop is expanded to 1/2 of the minimum width to form a wide area pattern.
Create a reduced closed loop, and if it is enlarged, it will be the coordinate data outside the wide area pattern, and if it is reduced, it will be the coordinate data inside the wide area pattern where the wide area pattern data creation range coordinate data is the outside coordinate data. A computer-aided design device characterized by having a creation means 61.