JPH0683907A - Computer aided designing device for printed wiring board - Google Patents

Abstract

PURPOSE:To correct plural end points at a time and perform the process in a short time when a wiring pattern is corrected to the center of the land pad of a non-grating component on the printed wiring board. CONSTITUTION:This device is equipped with an end point indicating circuit 1 which specifies end points of the wiring pattern of the printed circuit board, an intersection calculating circuit 4 which decide an intersection from the coordinates of the wiring pattern indicated by the end point indicating circuit 1 and the land pad, a land pad center calculating circuit 5 which finds the center coordinates when there is the intersection, a pattern angle calculating circuit 6 which finds the angles of the pattern to be corrected to the land pad center and the pattern one pattern before respectively, a pattern movement quantity calculating circuit 7 which finds a correction quantity from the angle and coordinates of the center correction line of the pattern angle calculating circuit 6 and the center coordinates of the land pad center calculating circuit 5, an end point calculating circuit 8 which calculates the end point position of the corrected pattern from the corrected quantity and outputs it, and an end point registering circuit 9 which registers the end point from the end point calculating circuit 8. Consequently, multiple end points can be corrected at a time and the process is completed in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer-aided design device for a printed wiring board, and more particularly to a wiring design device capable of correcting a pattern at the center of a land or pad not on a grid of a printed wiring board.

[0002]

2. Description of the Related Art Conventionally, a computer-aided designing apparatus for a printed wiring board of this type has been modified by inputting the movement amount of each of these wirings from a keyboard. Further, the center of each of these wirings is calculated, and the pattern is drawn out from this center to correct the pattern. In addition, the angle of the pattern drawn into the land or pad or the pattern immediately before the drawn pattern is 90 °.
Direction or 45 ° direction. In addition, the pattern is corrected by setting a grid that matches the pitch of the land or pad of the wiring. Further, by selecting one line and designating a land or a pad, the center of the land or pad is calculated, and correction is performed so that the center is drawn to this center.
In addition, other information such as pin information is created in the center of the land or pad in advance, and the data is corrected by drawing it.

[0003]

In the above-mentioned conventional computer-aided design apparatus, since the correction is made for each wiring, it takes a lot of time for correction, and the display for displaying the data is required. Since the device is occupied for a long time, there is a problem that the parallel processing capability is lowered, and the viewing is deteriorated because the display device is viewed for a long time. In addition, it is necessary to create other information for recognizing the center of the wiring, and it is necessary to enter multiple inputs and the amount of movement with a keyboard and mouse, which causes problems such as poor operability. there were.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and to provide an assisted design apparatus for a printed wiring board capable of collectively correcting the wiring pattern in a short time.

[0005]

The computer-aided design apparatus of the present invention has an end point designating circuit for designating a plurality of end points of a wiring pattern of a printed wiring board, and a wiring pattern designated by the single point designating circuit. An intersection point calculation circuit for discriminating the intersection point from the coordinates and the land pad, a land pad center calculation circuit for obtaining the center coordinates of the intersection point when there is the intersection point, a pattern to be corrected to the land pad center point and the one before that. A pattern angle calculation circuit for respectively obtaining the angle of the pattern, and a pattern movement amount calculation circuit for obtaining the correction amount from the angle and coordinates of the center correction line of the pattern angle calculation circuit and the center coordinates of the land / pad center calculation circuit, An end point calculation circuit for calculating and outputting the end point position of the correction pattern from the correction amount, and an end point registration for registering the end point from this end point calculation circuit And the land pad of the component mounted on the printed wiring board is not on the predetermined grid of the printed wiring board, and the wiring pattern connected to this land pad deviates from the center coordinate of the land pad. When the deviation is corrected and connected to the center coordinates when created, it is characterized in that a plurality of end points to be corrected can be collectively designated and corrected at one time.

[0006]

1 is a block diagram for explaining an embodiment of the present invention. In this embodiment, the end point designating circuit 1 designates a plurality of end points of the pattern to be corrected at the center of the land or pad. The end point reading circuit 2 reads out one end point designated by the end point designating circuit 1 from the pattern memory circuit 10. Next, the land and pad reading circuit 3 reads one coordinate from the land and pad memory circuit 11.

Next, the intersection point calculation circuit 3 reads the coordinate values read by the end point reading circuit 2 and the land and pad reading circuit 3.
It is determined whether there is an intersection or not from the coordinate values read in and the intersection is obtained. If there is no intersection here, the process returns to the land and pad reading circuit 3 and jumps to the process of reading the information of the next land and pad. Next, if there is an intersection, the land / pad center coordinate calculation circuit 5 obtains the center coordinates for each land or pad data creation type.

Next, the pattern angle calculation circuit 6 calculates and obtains the angle of the pattern to be corrected in the center of the land or pad and the angle of the pattern immediately before the pattern to be corrected in the center. The pattern movement amount calculation circuit 7 determines the center of the land or pad from the center coordinates calculated by the land / pad center calculation circuit 5 and the angle and coordinate value of the line corrected to the center calculated by the pattern angle calculation circuit 6. The correction amount to be corrected is calculated, and the intersection of the pattern corrected to the center of the land and the pattern immediately before is calculated, and the correction amount of the pattern immediately before is calculated.

Next, the end point calculation circuit 8 calculates a new end point position according to the pattern movement amount obtained by the pattern movement amount calculation circuit 7. The end point registration circuit 9 registers in the pattern memory circuit 10 at the new end point position obtained by the end point calculation circuit 8.

FIG. 2 shows a printed circuit board C of the embodiment shown in FIG.
It is a flow figure explaining a processing procedure of an AD system. As shown in the figure, first, in sequence 1 (hereinafter referred to as S1 and the same applies to other sequences), a plurality of end points of a pattern for correcting the center of the land or pad at a time are designated. Next, in S2, one is read from the plurality of end points specified in S1. At this time, when the processing of the end point designated in S1 is completed, the processing sequence is exited and the processing returns to the main sequence. If you can read the data in S2,
Go to the next sequence.

Next, in S3, one land or pad data existing near the coordinate value read in S2 is read.
In the next step S4, it is determined from the land or pad data read in step S3 whether there is an intersection. If there is no intersection here, the process returns to S3, the land or pad data is read, and the land or pad where the intersection exists is searched. If there is an intersection, jump to the next sequence.

Next, in S5, center coordinates (that is, target coordinate values for correction) are calculated from the information of the land or pad having the intersection found in S4. However, the calculation method is changed depending on the method of creating the land or pad information. Next, in S6, the angle of the pattern data read in S2 is calculated, and the angle of the pattern immediately before the pattern to be corrected at the center of the land or pad is calculated.

Next, in S7, the movement amount for correcting the pattern to the center of the land or pad is obtained from the coordinate value of the center of the land or pad obtained in S5 and the angle of the pattern obtained in S6. Alternatively, the movement amount of the pattern to be corrected to the center of the pad and the pattern immediately before the pattern to be corrected to the center is obtained.

Next, in S8, a new end point position, that is, a coordinate value corrected to the center of the land or pad is obtained in accordance with the movement amount obtained in S7. Next, in S9, the pattern data of the coordinate values corrected in the center of the land or pad obtained in S8 is registered. After this registration is completed in S9, S2
Return to the next end point processing.

FIG. 3 is a block diagram showing the minimum configuration of a system for performing the processing of FIG. That is, a central processing unit 15 for performing calculation or processing, a storage device 18 for storing data, an input device 17 for inputting data, commands, etc., a display device 19 for displaying data, and for outputting results. The output device 16 of FIG.

FIG. 4 is a plan view for explaining the embodiment of FIG. Here, the pad 20 has patterns 21 and 22 before correction.
(Solid line) is connected. According to this embodiment, the patterns 21 and 22 are corrected as patterns 23 and 24 (dotted lines).

FIG. 5 is a block diagram for explaining the second embodiment of the present invention. In the present embodiment, a land and pad comparison circuit 12 and a land and pad index circuit 13 are added to the first embodiment shown in FIG. Other than these, it is the same as FIG.

The land and pad comparison circuit 12 compares the land or pad data read by the land and pad reading circuit 3 with the data instructed by the land and pad index circuit 13, and determines whether or not the data is the data designated by the land and pad index circuit 13. If they do not match, the process returns to the land and pad reading circuit 3, and if they match, the process jumps to the intersection calculation circuit 4.

FIG. 6 is a flow chart for explaining the embodiment of FIG. Also in this case, S10 is added to the flow chart of the first embodiment.
2 is newly added, and is otherwise the same as FIG.

In S10, it is judged whether or not the land or pad data read in S3 matches the data indicated by the index. If they do not match, S3 is determined.
To S4, and if they match, jump to S4.

FIG. 7 is a plan view for explaining the processing of the embodiment shown in FIG. There is a surface pattern 26 around the land 25,
The uncorrected patterns 21 and 22 (solid lines) are connected. According to the present embodiment, the patterns 21 and 22 are corrected to the patterns 23 and 24 (dotted lines) using the land 25 as an index.

[0022]

As described above, according to the present invention, the land pad of the component mounted on the printed wiring board is not on the grid, and the pattern connected to this land pad is the land pad.
When making corrections that are created outside the center of the pad and connect the pattern to the center of the land pad, you can shorten the correction time and lead time by specifying multiple correction end points and correcting them all at once. Occupied time is shortened and parallel processing capacity is increased. Further, since the central coordinates are automatically calculated, the amount of data can be small and the information creation time can be shortened. In addition, the angle of the pattern to be corrected to the center of the land pad and 1 of this correction pattern
Since the angle of the pattern before this is not defined as a multiple of 45 ° and 90 °, the correction time can be shortened.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating an embodiment of the present invention.

FIG. 2 is a flowchart illustrating processing of the embodiment of FIG.

FIG. 3 is a block diagram showing the basic configuration of the system using FIG.

FIG. 4 is a plan view for explaining the operation of the embodiment shown in FIG.

FIG. 5 is a block diagram illustrating a second embodiment of the present invention.

FIG. 6 is a flowchart showing the processing of the embodiment shown in FIG.

FIG. 7 is a plan view for explaining the operation of the embodiment shown in FIG.

[Explanation of symbols]

 1 end point instruction circuit 2 end point reading circuit 3 land and pad reading circuit 4 intersection calculation circuit 5 land and pad center calculation circuit 6 pattern angle calculation circuit 7 pattern movement amount calculation circuit 8 end point calculation circuit 9 end point registration circuit 10 pattern memory circuit 11 land and pad memory circuit 12 land and pad comparison circuit 13 land and pad index circuit 15 central processing unit 16 output device 17 input device 18 storage device 19 display device 20 pad 21 pattern A (before correction) 22 pattern B (before correction) 23 pattern A (after correction) 24 pattern B (after correction) 25 land 26 surface pattern

Claims (1)

[Claims] 1. An end point designating circuit for designating a plurality of end points of a wiring pattern of a printed wiring board, and an intersection point calculating circuit for discriminating an intersection point from a coordinate of a wiring pattern designated by the single point designating circuit and a land pad. , The land / pad center calculating circuit for obtaining the center coordinates of the intersection, the pattern angle calculating circuit for obtaining the angle of the pattern to be corrected to the land / pad center and the pattern immediately before that, and the pattern angle A pattern movement amount calculation circuit for obtaining the correction amount from the angle and coordinates of the center correction line of the calculation circuit and the center coordinates of the land / pad center calculation circuit, and an end point for calculating and outputting the end point position of the correction pattern from the correction amount. A land of a component mounted on the printed wiring board, comprising a calculation circuit and an end point registration circuit for registering the end point from the end point calculation circuit. -When the pad is not on the specified grid of the printed wiring board and the wiring pattern connected to this land pad is created with deviation from the center coordinate of the land pad, the deviation is corrected and the center coordinate is connected. In this case, a computer-aided design device for a printed wiring board is characterized in that a plurality of end points to be corrected can be collectively designated and corrected at one time.