JPH1040271A - Change work drawing generation/output device for printed wiring board and generation/output method for change work drawing when wiring pattern is cut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a change work drawing generation/output device which can reduce man-hour by means of a manual operation for indicating an optimum cut position by considering a cut condition in the design change work of a printed wiring board containing the cut of a wiring pattern. SOLUTION: The change difference of logic information is extracted from the design file of the printed wiring board before and after the change and reads a change information file 5 based on the difference. Condition information in the cut is read from a cut condition file 6 and an electric condition in the cut position is checked. A physical condition in the cut position is checked from condition information and part information on a part information file 7. The change work drawing of the wiring pattern which is cut in the satisfied cut position is generated and outputted based on both checks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for creating a modified work diagram for use in a modified work of a printed wiring board, and more particularly to an electrical / physical cutting condition when a wiring pattern is cut. The present invention relates to a technique which is effective when applied to an apparatus and method for creating a change work diagram for checking and determining an optimum cutting position.

[0002]

2. Description of the Related Art In printed wiring boards, design changes,
When the specification change occurs and the circuit design data in the original design file is changed, the previous wiring pattern can be cut,
The work of providing a new connection line is required.

In this work, it is necessary to create a change work diagram, and the change work diagram generally creates a difference between the design file before change and the design file after change as change information.

As such a method, for example, Japanese Unexamined Patent Publication No.
No. 266140 discloses a "method of remodeling and editing a printed wiring board". In this method, when a wiring pattern is cut, its position is determined by a predetermined rule (within a certain distance from a terminal to be cut). , Etc.).

[0005] In addition, when parts and the like are mounted on the determined position, manual operations such as confirmation of the cutting position by hand and editing of the cutting position by conversation processing are required.

[0006]

In the above prior art, the cutting position of the wiring pattern is determined by a predetermined rule (such as cutting within a certain distance from the terminal to be cut), and the optimum position is determined. No change has been made.

For this reason, when the cutting position is below the part, it is necessary to confirm the cutting position and change the cutting position by dialogue, and there is a problem that the number of man-hours is increased.

Further, when cutting a wiring pattern on a high-frequency, high-density printed wiring board, it is necessary to take into account the electrical effects (such as the limitation of the length of the surplus pattern) and the ease of work. There was a problem that it was not checked whether the cutting position was appropriate.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems, and a technique capable of reducing the number of man-hours required for determining an optimum position when cutting a wiring pattern. To provide.

[0010] Another object of the present invention is to provide a technique capable of creating a change work diagram capable of designating an optimum cutting position in consideration of electrical / physical cutting conditions.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0012]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

A change drawing of a printed wiring board for extracting a change difference of logical information from a design file of a printed wiring board before and after a change, creating and outputting a change work diagram used for the change work based on the change difference, In the apparatus, as a change work diagram creation output means at the time of cutting the wiring pattern by the change difference, the condition information in cutting the wiring pattern, the component information connected to the wiring board, and the electrical condition at the wiring pattern cutting position by the change difference. Electrical condition checking means for checking based on the condition information; physical condition checking means for checking physical conditions at a wiring pattern cutting position based on the change difference based on the condition information and component information; Create a change work diagram of a wiring pattern cut at a cutting position that satisfies the means Comprising stages and, a change work diagram output means for outputting the change work diagram created by the change work diagram drawing means.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining a configuration of a printed wiring board change work diagram creating apparatus according to an embodiment of the present invention.

As shown in FIG. 1, a modified work diagram creating apparatus 100 according to the present embodiment stores a pre-change design file 2 for storing logical information and wiring information of a printed wiring board, and logical information after the change. The changed design file 3, the changed design file 2, and the changed design file 3, extract the change difference of the logical information, and store it in the change information file 5 together with the wiring pattern information before the change. Unit 1 and its change information file 5 are read.
An electrical cut check is performed based on a pattern length and the like required at the time of cutting, which is read from the cutting condition file 6, and a physical cut check is performed based on component position, shape information, and the like read from the component information file 7. A cutting condition check unit 4 that determines a position where a cutting position can be physically / electrically provided and stores the result of the electrical check / physical check in a check result file 8.
And check result file 8 for the pattern to be changed
Is converted into a data format (for example, DXF format) that can be displayed as a drawing based on the information of the wiring pattern information before the change stored in the change information file 5 and stored in the changed drawing data file 10. A design change drawing display for displaying the change drawing data file 10 using the design change drawing data file creating unit 9, the display device 12 and the output device 13, and outputting a change work drawing indicating an optimum cutting position. Unit 11.

Next, the above-described change information file creating section 1
For the design files 2 and 3 before and after the change, which becomes the input of
This will be described with reference to FIG.

As shown in FIG. 2, the pre-change design file 2
Has logic information 21 and wiring information 22 at the time of substrate creation,
Each generation is managed by a revision (Rev).

Here, if a design change involving cutting or wiring of a wiring pattern occurs on the final board, the final revision of the design file 2 before change (here, Rev.
The logical information of (0) is copied as a separate file, new logical information 31 is input thereto, and created as a modified design file 3 (Rev. 1 in this case). Thereafter, if there are multiple changes, the design file is updated (the revision is increased for each update). From the logical information change difference between the design file 2 before change and the design file 3 after change, all nets to be changed are extracted and the change information file 5
Register with. At this time, the wiring information of the pre-change design file 2 is also registered in the change information file 5.

Next, the processing of the disconnection condition check unit 4 performed on the data of the change information file 5 will be described.

FIG. 3 is a flowchart for explaining the processing of the cutting condition check unit 4.

A net is extracted one by one from the change information file 5 (step 300), and it is determined whether or not the net is a target of pattern cutting (step 31).
0) If the target net is a disconnection target, an electrical condition check is performed in consideration of the electrical conditions of the disconnection condition file 6 (step 320), and the range that can be disconnected is limited.

Next, a physical condition check is performed in consideration of the component shape and the like of the component information file 7 (step 33).
0), a target pattern suitable for cutting is selected, and a cutting position is determined (step 340).

Then, the determined cutting position and the check result are output to the check result file 8 (step 35).
0) If the data of the net including the wiring to be cut is not completed, the process returns to step 40 (step 360).

Next, the cutting condition file 6 and the step 32
The electrical condition check of 0 and the physical condition check of step 330 will be described in detail with reference to FIGS.

FIG. 4 is a diagram for explaining the cutting condition file 6.

As shown in FIG. 4, the cutting condition file 6 includes an electric condition table 61 shown in FIG.
It comprises a physical condition table 65 shown in FIG.

As shown in FIG. 4A, the electrical condition table 61 includes a net type 62 and a surplus pattern limit value 63.
As shown in FIG. 4B, the physical condition table 65 includes a cutting position condition 67 and a priority order 6 based on the cutting position condition 67.
6 Note that the electric condition check here uses a surplus pattern as an example.

FIG. 5 is a flowchart for explaining the electric condition check processing. Here, a case in which the above-described surplus pattern is used as an electrical condition check will be described.

As shown in FIG. 5, in the electric condition check, first, a surplus pattern limit value corresponding to the net to be cut is obtained from the electric condition table 61 in the cutting condition file 6 shown in FIG. Decide (step 500)
If the length of the cut target net is smaller than the limit value (step 510), the surplus pattern limit value is satisfied no matter where the cut point is provided. (Step 5
20).

If the length of the net to be cut is twice or more the surplus pattern limit value (step 530), two cut positions need to be provided. Line segments (two locations) equal to the surplus pattern limit value traced from both end points are set (step 540).

With respect to the other nets to be cut, the cut net is traced from the start point, and a line segment equal to the surplus pattern is extracted (step 550), and the line segment equal to the surplus pattern is extracted from the end point (step 550). Step 5
60), a line segment that satisfies both step 550 and step 560 is defined as a net range that satisfies the electrical conditions (step 570).

Next, a method of tracing the cutting target net and extracting a line segment will be described with reference to FIG.

The wiring information of the target net is stored in the change information file 5 in the XY coordinate format. For example, the line segment shown in FIG. 6 is a (X1, Y1) -b (X2, Y2) -c
(X3, Y3)-d (X4, Y4). Xn and Yn respectively represent XY coordinates such as real coordinates and grid coordinates.

Here, tracing means starting from one end point of the net and tracing along a line segment while obtaining a straight line distance to the next coordinate point toward the other end point. A trace point equal to the length to be traced can be obtained on the line segment.

For example, when the point a shown in FIG. 6 is set as the starting point, 2 points are obtained by the coordinates a (X1, Y1) and b (X2, Y2).
The straight line distance between the points is obtained and compared with the length to be traced (surplus pattern limit value). When the straight line distance between a and b is longer than the length to be traced, it is understood that the trace point exists on the straight line between a and b, and the inclination of the straight line obtained from the straight line passing through the points a and b and the length to be traced , The coordinates of the trace end point can be obtained.

The coordinates of the trace end point are represented by t1 (X5, Y
5), a line segment equal to the length to be traced is a (X
(1, Y1) -t1 (X5, Y5).

If the straight line distance between a and b is shorter than the length to be traced, the trace point is obtained in the same manner in consideration of the next straight line distance between b and c.

FIG. 7 is a flowchart for explaining the physical condition check process.

In the physical condition check, as shown in FIG. 7, it is checked whether the net range satisfying the above-mentioned electrical conditions belongs to the surface layer or the inner layer of the printed wiring board (step 700). 4 and the arrangement area of the parts extracted from the parts information file 7 to check if they overlap (step 710).
A high-priority cutting position condition 67 that has never been taken out is taken out from the physical condition table 65 of the cutting condition file 6 shown in FIG. 7B (step 720), and step 720 is satisfied by the check results of steps 700 and 710. It is checked whether there is a net line segment (step 730), and if there is a corresponding net line segment, it is set as a net satisfying the physical conditions (step 74).
0).

If there is no corresponding net line segment, if there is a cutting position condition (step 750), step 720
If there is no cutting position condition, a net range satisfying the physical condition is set as a net line segment satisfying the above-described electrical condition (step 760).

Next, the above-described electrical condition check and physical check will be described with reference to specific examples.

As described above, the electrical check includes a limitation on the length of the surplus pattern from the terminal generated by the pattern cutting to the cutting point, and the like. In the case of the pattern shown in FIG. Since the registered surplus pattern limit value is 10 cm, it is understood that a cutting point cannot be set in the range abc, ef where the surplus pattern cannot be observed, and the range in which the cutting point can be set is cd-. e
Becomes

Next, the pattern satisfying the condition of the electrical check is performed in accordance with the priority for selecting the cutting position in the physical condition table 65 shown in FIG. 4B, and the optimum cutting position can be set. To extract the appropriate patterns.

As shown in FIG. 9, the physical condition table 6
The range d1-d2, f2-e, which is the surface layer with priority 1 of No. 5 and not under the component, is targeted.

Thus, the range satisfying the electrical condition check and the physical check is d1-d2, f2-e.
By automatically setting an arbitrary position in this range as a cutting position, it is possible to obtain an optimum cutting position.

Therefore, as described above, a change difference of the logical information is extracted from the design file of the printed wiring board before and after the change, and the change position of the net where the wiring pattern needs to be cut based on the change difference is determined. The electrical cutting condition is checked, the physical position is checked for the cutting position that satisfies the electrical cutting condition, the cutting position that satisfies both conditions is determined as the optimal cutting position, and the determined cutting is performed. By creating and outputting a change work diagram used for change work based on the position, it is possible to automatically determine the optimal cutting position of the wiring pattern, and it is possible to reduce the number of man-hours for cutting positioning Becomes
In addition, it is possible to create a change work diagram that can indicate an optimum cutting position in consideration of electrical / physical cutting conditions.

As described above, the invention made by the present inventor is:
Although specifically described based on the embodiment, the present invention
It is needless to say that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the scope of the invention.

[0048]

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.

At the time of cutting the wiring pattern, it is possible to reduce the number of man-hours required to manually determine the optimum position.

Further, it is possible to create a change work diagram that can indicate an optimum cutting position in consideration of electrical / physical cutting conditions.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a configuration of a printed wiring board change work diagram creating apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining design files 2 and 3 before and after a change.

FIG. 3 is a flowchart for explaining a process of a cutting condition check unit 4;

FIG. 4 is a diagram for explaining a cutting condition file 6;

FIG. 5 is a flowchart for explaining an electrical condition check process.

FIG. 6 is a diagram for explaining a method of extracting a line segment by tracing a cutting target net;

FIG. 7 is a flowchart illustrating a physical condition check process.

FIG. 8 is a diagram for specifically explaining an electrical condition check.

FIG. 9 is a diagram for specifically explaining a physical condition check;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Change information file preparation part, 2 ... design file before change, 3 ... design file after change, 4 ... cutting condition check part, 5 ... change information file, 6 ... cutting condition file, 7
... Part information file, 8 ... Check result file, 9 ...
Design change drawing data file creation unit, 10 ... change drawing data file, 11 ... design change drawing display unit, 12 ... display device, 13 ... output device.

Claims (2)

[Claims] 1. A printed wiring board change work diagram for extracting a change difference of logical information from a design file of a printed wiring board before and after a change, and creating and outputting a change work diagram used for the change work based on the change difference. In the creation output device, as a change work diagram creation output means at the time of cutting the wiring pattern due to the change difference, condition information in cutting the wiring pattern and component information connected to the wiring board; An electrical condition checking unit that checks a condition based on the condition information; a physical condition checking unit that checks a physical condition at a wiring pattern cutting position based on the change difference based on the condition information and the component information; A change work diagram that creates a change work diagram for a wiring pattern cut at a cutting position that satisfies both check means Forming means and said change work diagram printed circuit board change work diagram drawing output apparatus characterized by comprising a changing operation diagram output means for outputting been changed working diagram created by creating means. 2. A method for generating and outputting a change work diagram when a wiring pattern of a printed wiring board is cut, wherein a change difference of logical information is extracted from a design file of the printed wiring board before and after the change, and the wiring pattern is cut by the change difference. Check the electrical cutting condition of the cutting position for the net that needs to be done, and check the physical condition for the cutting position that satisfies the electrical cutting condition,
A cutting position that satisfies both conditions is determined as an optimum cutting position, and based on the determined cutting position, a change work diagram used for the change work is created and output, and a change work diagram at the time of cutting a wiring pattern is provided. Creation output method.