JPS62247464A - Processing system for decision of wiring cutting position - Google Patents

Abstract

PURPOSE:To automatically designate the cutting position of a wiring by identifying both linear and planar patterns out of all routes which connect the terminal patterns to be separated and other terminal patterns and defining a part of each linear pattern as a cutting position. CONSTITUTION:If a terminal A to be separated is designated, a wiring route led from the pattern A and reaching another terminal pattern is retrieved. Then a route reaching a pattern B from the pattern A via S6-P1-S1, for example, is extracted. The linear pattern S6 led from a terminal pattern is defined as a wiring linear pattern to be cut and stored. In such a way, the wiring cutting positions are successively decided and a cutting unable information is delivered in case a route including no wiring pattern is detected. While said processing is repeated when another terminal pattern to be separated is detected.

Description

[Detailed Description of the Invention] [Summary] Processing method for determining the wire cutting position on the printed board when modifying the circuit wiring 0 Terminal patterns that require cutting on the printed board and others according to the circuit change The line pattern and surface pattern of the wiring are identified from all the paths connecting the terminal pattern of the line pattern, and each one of the line pattern parts is selected as a cutting position. This method makes it possible to automatically specify the wiring cutting position of a printed board that includes a planar wiring pattern that is unsuitable for cutting.

[Industrial application field]

The present invention relates to a processing method for determining wiring cutting positions on a printed board when circuit wiring is modified in a computer-based automatic design system.

Automatic design systems for printed circuit boards are widely used. If the circuit is required to be changed for a printed board designed with such a system, and the design/manufacturing process has progressed to a certain extent, the existing needle printed board may be modified and used. There is.

In such cases, it is often necessary to cut the wiring pattern already created on the printed circuit board.

[Prior art and problems to be solved by the invention] FIG. 3 is an explanatory diagram of an example of a printed board wiring pattern.

The printed board wiring pattern of Figure 3 (C1 is shown in Figure 3 (a)
) is a wiring pattern that connects terminal patterns A to E, and a wiring line pattern S is used for the wiring.

~S, wiring surface pattern P1. which is provided in consideration of current capacity. Pz etc. are used.

Terminal patterns A-E are the required number of wiring line patterns S1
~ S9, the required current capacity between the terminal patterns is increased by connecting the terminal patterns, or by connecting them to the wiring surface pattern, or by directly connecting them to the wiring surface pattern P, such as the terminal pattern C. A satisfying route is constructed.

Here, the wiring line pattern is a linear wiring pattern with a relatively narrow constant width determined by the type of printed board, for example, and is a pattern in which both ends of each line segment constituting the line pattern are placed on the printed board. Each pattern is determined by specifying the specified coordinates.

In addition, a wiring surface pattern is a polygonal pattern of an arbitrary shape, which generally occupies a sufficiently larger area than a line pattern. The pattern is determined by specifying .

When it is necessary to disconnect a terminal pattern on a printed circuit board wiring, it is relatively easy to cut a wiring line pattern, but it is difficult to cut a surface pattern, so it is necessary to disconnect a terminal pattern that requires disconnection. It is necessary to find and cut the line pattern of the wiring route coming out of the .

If it is necessary to cut the surface pattern for separation, the circuit change for the terminal pattern must be handled by a method other than cutting the wiring pattern.

Therefore, for example, it is necessary to perform a process of determining the wiring line pattern indicated by an x in FIG. 3(C) as a position requiring cutting by comparing the drawing of the wiring pattern with the circuit drawing.

In the past, the determination of the cutting position and the judgment of the possibility of cutting were performed by humans by comparing the printed circuit board pattern with the circuit, which caused problems in the amount of man-hours and reliability involved in this process.

[Means for solving problems]

FIG. 1 is a process flowchart showing the configuration of the present invention.

The figure shows the process flow for automatically determining the cutting position for each disconnection terminal pattern, with 1 being the processing step for inputting disconnection terminal pattern information, and 2 to 5 being the process for determining the disconnection position for each route and determining the possibility of disconnection. Step 6.7 is a processing step for outputting the processing results.

[For production]

It is assumed that information on the existing printed circuit board wiring pattern has been input in advance, and in process step 1, information on the terminal pattern that requires separation is input to start the process.

In processing step 2, a wiring route from the separated terminal pattern to another terminal pattern is searched.

If there is a route, one route is extracted, and in processing step 3 and processing step 4, it is scanned to see if the extracted route includes a wiring line pattern.

If there is a wiring line pattern, the position of the wiring line pattern to be cut is determined in processing step 5, and the process returns to processing step 2 to search for another route.

In this way, the cutting positions are sequentially determined, and when there are no more paths connecting to other terminal patterns, processing branches from processing step 3 to processing step 6, and information on the determined cutting positions is output.

Further, in the process of processing steps 2 to 5, if a route that does not include a wiring line pattern is detected, the process branches from processing step 4 to processing step 7, and a notification that cutting is not possible is output.

By the above method, the cutting position determination of printed board wiring is automatically processed.

〔Example〕

FIG. 2 is a block diagram showing an example of the configuration of a computer system for automatically determining printed board wiring cutting positions.

The automatic cutting position determination program executed by the processing device 12 inputs necessary information from the storage device 10.11, processes it, and outputs the processing result to an output device 13 such as a printer device.

The storage device 10 holds printed board wiring pattern information, and the storage device 11 holds update information due to design changes.

The program executed by the processing device 12 first inputs the printed board wiring pattern information of the storage device 10 and configures network information of connection relationships as shown in FIG. 4, for example. FIG. 4 shows an example of a network corresponding to the printed circuit board wiring shown in FIG. 3 (C1).

Next, the process of step 1 in the process flow of FIG. 1 is started, and information on one terminal pattern that requires separation is input from the storage device 11.

For example, as in the above example, if terminal pattern A that requires disconnection is specified, then in processing step 2, a wiring route from disconnection terminal pattern A to another terminal pattern is searched, for example, as shown in FIG. There is a route from A to B via 5s-P+-S+, so this route is extracted.

If there is a route in processing step 3, processing step 4
Proceed to step 5, as there is a wiring pattern.
Proceed to.

In processing step 5, the line pattern Sb emerging from the terminal pattern is determined and stored as the wiring line pattern to be cut, and the process returns to processing step 2 for searching for another route.

In processing step 2, a route is searched in the same manner as described above, assuming that the wiring line pattern that has already been determined as a cutting position has been cut.

In this way, the cutting positions are sequentially determined, and when there are no more paths connecting to other terminal patterns, the process branches to processing step 6 based on the determination in processing step 3, and the information about the cutting position determined and stored in processing step 5 is Output.

In addition, in the process of processing steps 2 to 5, if a route that does not include a wiring line pattern is detected, at least that route cannot be cut, and therefore the terminal pattern being processed is
Since it cannot be separated using the cutting method, process step 7
Branch to and output a notification that disconnection is not possible.

If there are other terminal patterns that require separation, the process from process step 1 is repeated as described above.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the cutting position determination for changing the printed circuit board wiring is automatically processed, thereby reducing the number of man-hours for the changing process and improving the reliability of the process. It has significant industrial effects.

[Brief explanation of drawings]

FIG. 4 is a diagram showing an example of a connection relationship network. In the figure, 1 to 6 are processing steps, 10.11 is a storage device, 12 is a processing device, 13 is an output device, A to E are terminal patterns, P2 is a wiring surface pattern, S and ~S are wiring Indicates the line pattern. Figure 1. Block diagram of a configuration example of a computer system. 9. Fat Q
)Explanatory diagram of 1 printed board 1ν turn Figure 3

Claims (1)

[Claims] When determining the cutting position of a wiring pattern constituting a circuit wiring on a printed board according to a terminal separation specification for the circuit, the terminal pattern, the wiring line pattern, and the wiring surface pattern are determined. For all routes formed by connecting the wiring line pattern and the wiring surface pattern so as to connect the terminal pattern specified for separation and other terminal patterns,
A wiring cutting position determining processing method, characterized in that the method is configured to select one of the wiring line patterns on each route as a cutting position (2 to 5).