JPH03118664A - Trimming data generating method - Google Patents

Abstract

PURPOSE:To attain the reuse of the PCB-CAD data for change of a design by generating automatically the trimming data by using a clearance function for design rule check at another level. CONSTITUTION:A large capacity memory 2 stores the trimming data output instruction data, the clearance check instruction data, the print panel CAD data (part), a design rule check DRC program, etc. The necessary data and drawings are produced on a CRT 5 via the operation signal and an instruction given from a keyboard 6. At the same time, the instruction and the correction are carried out in a conversational form. Then the clearance check is performed based on the instruction data which performs the clearance check in the DRC. Then the trim data is produced at another level designated by the keyboard 6. The trim process data is trimmed on a memory based on the instruction data so as to keep the clearance between the data that are unable to keep the clearance. Furthermore the trim process data is also cut according to the overlapping data width and the offset value.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a print [CAD (PCB CA)
D) Regarding the trim data generation method in the system,
In more detail, trim data that can automatically output trim data to a specified level by using a function (clearance check function) that checks whether printed board CAD data maintain a specified distance from each other. Regarding the generation method.

<Prior Art> A printed board CAD system is a system that creates a printed board model (a type of database) in a computer through interaction between the computer and an operator.

In addition to automatic placement and wiring functions, such systems have functions such as checking whether printed board CAD data maintain a specified distance from each other (clearance check function). By inputting component information and connection information, components can be automatically placed and wiring patterns can be drawn.

In such a system, as shown in FIG. 6, for example, when forming silk, vias (collectively termed component pins or through holes), or other patterns in the vicinity of the conductor pattern, trim processing (component pin A so-called "D cut" process) is performed.

Conventionally, in such cases, the symbol is developed into pixels as shown in (a), and the component pin data is converted into (
The data was converted into plane data as shown in b), and then the plane was cut as shown in (C).

<Problem to be solved by the invention> However, according to this conventional method, the symbols become pixels and the component pins become planes, so the design data after trimming is not processed as is. There was a problem that it could not be used for design changes, etc.

The present invention was made in view of these points, and the present invention has been made in view of the above points.
A trim data generation method that allows trim data to be automatically generated to another level using the DRC clearance function without directly changing CB CAD data, and that allows PCB CAD data to be reused for design changes. The purpose is to provide.

Means to solve problems〉 FIG. 1 is a flowchart illustrating the principle of the invention.

The method of the present invention is a method for generating trim data in a printed circuit board CAD (PCB CAD) system equipped with a buzzer and rule check (DRC) program, which maintains a device specified by the printed circuit board CAD data. A function (clearance check function) is provided to check whether the pixels are the same, and the trim data is created at a different level specified using the clearance check function in DRC. The process is characterized by selecting trimming data with a cursor.

<Operation> CA I) It is possible to automatically generate trim data to another level using the DRC clearance function without directly changing the data.

<Example> Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram showing an example of an apparatus for implementing the method of the present invention. In the figure, 1 is a processor (C
PU), 2 is a large capacity memory such as a disk, 3 is a printer for printing drawings etc. created based on the created PCB CAD data, 4 is a memory for storing various data and programs, 5 is a CRT, 6 is a keyboard K
eyB.

ard and includes softkey means such as a mouse.

Daikan 1 education memory 2 contains trim data output instruction data, clearance check instruction data, printed board C
AD data (parts), design rule check (DRC) programs, etc. are stored.

Each memory 2, 4, printer 3, CRT 5, keyboard 6
are connected to the processor 1, and receive operation signals and instructions from the keyboard 6, create necessary data and drawings on the CRT 5, and also allow conversational instructions and corrections as necessary. It is composed of

Here, the trim data output instruction data stored in the large capacity memory 2 includes the following items.

(a) Data output level for trim Output trim data to the level specified here.

(b) Trim instruction/minimum trimmable width This means that when a component pin is formed close to the line pattern in Figure 3, the part close to the line pattern will be cut as shown in the figure. If the remaining portion after cutting does not exceed a certain width, it will no longer function as a component pin. This width TS is called the minimum trimmable width. If a value larger than the trimmable minimum width TS is obtained by cutting, trim data of a predetermined width is generated from the line pattern according to the trim instruction.

(c) Trim target data type and trim processing data definition For example, line and via (part pin or through hole)
For example, data types to be trimmed are specified in pairs, such as via and via.

(d) Trim/cut instructions and offset value As shown in Figure 4, if a part of a character overlaps a line, the overlapping line should be moved a certain distance (offset value) away from the character part. cut.

(e) Trimmable data output level In FIG. 3, if the minimum trim width cannot be met, that data is output.

The following items are included in the clearance check instruction data:

(a) Indication of clearance check target data (b) Clearance value (e) Processing target area and level The trim data creation method of the present invention, which is realized using a device with such a configuration, is as follows. It is.

(Operation 1) A clearance check is performed based on the instruction data for performing the clearance check function in the DRC, and trim data is created at another level specified by the keyboard 6.

If there are only pieces of data that cannot maintain clearance, the process (operation 2) described below is performed.

(Operation 2) Perform the following processing based on the trim instruction data.0 (1) When a trim instruction is issued, trim the trim processing data in the memory so that the clearance can be maintained.

At this time, if the minimum possible trim width can be maintained, it is written to the trim data output level in the large capacity memory 2. If the minimum possible trim width cannot be maintained, the data of the pair for which the clearance cannot be maintained is written to the non-trim possible data output level.

(2) When giving a trim/cut instruction, cut while taking into account the width of the overlapping data and the offsets on both sides.

Here, when giving a trim instruction, if the data to be trimmed are the same entity, for example, two lines, an instruction is given in a conversational manner as to which data should be trimmed, as shown in FIG.

That is, the line patterns LA and LB are I\Illuminating, and in this case, the user uses the keyboard 6 to specify, for example, line LB with the cursor.

When this instruction is received, the trim data for the line pattern LB as shown by the broken line will be output to the specified level.

<Effects of the Invention> As explained in detail above, the present invention generates trim data for another novel using the clearance function without directly changing the PCBCD data. There is no need to develop symbols into pixels, and the CAD data can be used as data for later design changes. Further, the width of the line pattern can be changed to a line having an arbitrary width in a conversational manner as shown in FIG.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the principle of the present invention, FIG. 2 is a block diagram showing an example of a device for implementing the method of the present invention, and FIG. 3 is a diagram for explaining trim instructions/minimum trimmable width. Fig. 4 is an explanatory diagram of trim/cut instructions and offset values, Fig. 5 is an explanatory diagram of trim processing when a trim instruction is given and the data to be trimmed is the same entity, and Fig. 6 is a conventional trim processing method. It is a diagram.

Claims (1)

[Claims] A trim data generation method in a printed circuit board CAD (PCBCAD) system equipped with a design rule check (DRC) program, which checks whether printed circuit board CAD data maintain a specified distance. Prepare a function to check (clearance check function), use the clearance check function mentioned above in DRC to create trim data at another specified level, and when the pixels are the same, trim in conversation processing A trim data generation method characterized by selecting data to be pointed to with a cursor.