JP3140869B2 - Printed wiring board design support system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board design support system, and more particularly, to a printed wiring board design for forming another electrically isolated conductor pattern in a whole conductor layer. The present invention relates to a printed wiring board design support system.

[0002]

2. Description of the Related Art When designing a film (conductor mask pattern) used in a manufacturing process of a printed wiring board, means for outputting negative image information for leaving a conductor called a negative and information for leaving a conductor called a positive There is a means to output
When most of the conductors of one wiring layer (one conductive layer) are left, negative information having a smaller data amount and higher accuracy than positive information is used for extracting drawing information for creating a mask pattern to be used. FIG. 6 exemplifies such negative information, wherein 1 is a conductor layer forming a power supply layer, 2 is a thermal land connecting pins and vias to the conductor layer 1, and 3 is a through hole connection electrically from the conductor layer 1. This is a first clearance portion to be insulated. On the other hand, when the number of conductors (the number of wirings) is reduced in one wiring layer to realize component mounting and high-density wiring, image information for creating a mask pattern to be used is normally output as positive information for extraction of drawing information. It is often the case that a part of the information to be put in a layer is desired to be put in one wiring layer (one conductive layer) that outputs as negative information. In response to such a request, as shown in a plan view in FIG. 3, a required clearance unit 4 (second clearance unit) is created so that the required negative information can be superimposed on the required negative information. For example, positive information of a wiring (conductor) pattern 5 as shown in a plan view in FIG. 4 to be placed and introduced in 4 is prepared, and these negative information and positive information are separately output, and a required mask pattern is formed. After the drawing, the negative mask pattern is inverted to a positive mask pattern as shown in a plan view in FIG. 7, these two positive mask patterns are combined, and one positive mask as shown in a plan view in FIG. It is a pattern.

On the other hand, recently, in a printed wiring board,
In order to eliminate (avoid) the complexity of circuit pattern design as wiring densification and multi-layering progress, so-called CAD (Computer)
Automation of screen display design called Aided Design (design support by computer) is widely used.

[0004]

When a film (conductor pattern mask) used in a manufacturing process of a printed wiring board is produced by the computer aided design system, for example, the following means are employed. .
The first means is as shown in the flowchart of FIG.
For example, negative information (negative conductor pattern design data) as shown in FIG. 3 and positive information (positive conductor pattern design data) as shown in FIG. In this method, the negative information and the positive information are separately verified by a verification unit and separately output. However, in the case of the first means, as described above, since the design rule check (DRC) between the negative information and the positive information cannot be performed in a series of operation processes, the discovery of a design error is delayed. In other words, a computer verifies the design rule check based on the electrical characteristics of the printed wiring board to be designed and the geometric design rules determined from the manufacturing process.
(DRC), it is not possible to find design mistakes and therefore create defective products.

As shown in the flowchart of FIG. 9B, the second means is to divide the information of one wiring layer (one conductive layer) without dividing it.
This is a method in which everything is edited as positive information by the database holding unit 6, and is verified and output by the verification unit. However, in the case of the second means, the negative information and the positive information are combined as positive information and a design rule check (DRC) is performed, but the negative information and the positive information cannot be output separately. There is. In other words, since the amount of data to be output is large (because it cannot be classified),
Not only does the time required to output information and the time required for drawing increase, but also because the storage and storage capacity of data is limited in terms of memory capacity, CAD functions such as drawing automation cannot be fully demonstrated. .

The present invention has been made in view of the above circumstances, and not only can mutually check the negative information and the positive information of one wiring layer, but also can output the negative information and the positive information separately, and can obtain reliable information. It is an object of the present invention to provide a printed wiring board design support system capable of easily achieving high-quality drawing.

[0007]

A printed wiring board design support system according to the present invention comprises a database holding means for inputting and holding verification data, negative and positive conductor pattern design data for each wiring layer, and the database holding means. Data output means for selectively outputting negative conductor pattern design data and part of the same wiring layer held by the database as positive conductor pattern design data; and negative conductor pattern design data and the same wiring held by the database holding means. A data synthesizing means for synthesizing the layer by replacing all of the positive conductor pattern design data with either positive or negative, and a synthetic data for checking and verifying the design data synthesized by the data synthesizing means based on the verification data. Verification means.

[0008] That is, the present invention provides a printed wiring board design support system, in which design information relating to an insulating base plate and a conductive pattern forming an insulating layer, and electrical characteristics and a manufacturing process of the printed wiring board to be designed are determined. Verification data that can be checked and verified by a computer based on the statistical design rule is input and stored in advance, and the negative information and positive information of one wiring layer (one conductive layer) can be checked by DRC. In this configuration, negative information and positive information are separately output.

[0009]

According to the printed wiring board design support system of the present invention, the database inputs and holds verification data, negative and positive conductor pattern design data for each wiring layer,
In addition, the negative and positive conductor pattern design data of the wiring layer are selectively divided and output. On the other hand, the necessary design data is synthesized by replacing the negative and positive conductor pattern design data of the same wiring layer held by the database with either negative or positive, and checked and verified by the verification data, and the accuracy and reliability of the drawing are confirmed. Sex is evaluated. In other words, by taking data input as normal conductor pattern data into the conductive layer input as negative conductor pattern data, it is possible to realize a printed wiring board design of high-density mounting and high-density wiring, Not only can the layer negative and positive conductor pattern design data be selectively divided and output, but also the same type of negative and positive conductor pattern design data that exist in the same layer and have different information forms. By performing verification like information, it is possible to output image formation information of a pattern (mask pattern) which is highly reliable and can be formed in a short time.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram showing a configuration example of a main part of a printed wiring board design support system according to the present invention. Reference numeral 7 denotes a database for inputting and holding verification data, negative and positive conductor pattern design data of each wiring layer. The holding means 8 is a data output means for selectively outputting the negative conductor pattern design data and a part of the same wiring layer held by the database holding means 7 as positive conductor pattern design data, and 9 is the database holding means 7 A data synthesizing means for synthesizing the negative conductor pattern design data and the positive conductor pattern design data of the same wiring layer held by the data synthesizing means by replacing either the negative or positive conductor pattern design data with one of the negative and positive ones; This is a means for verifying composite data that checks and verifies data based on verification data.

In this embodiment, a mask pattern having a conductor pattern (power supply layer) having a configuration shown in plan view in FIG. 2 is formed. In FIG. 2, 1 is a conductor layer forming a power supply layer, 5 is a wiring pattern disposed and formed at a predetermined position in the region of the conductor layer 1, and 2 is a conductor layer forming connection pins and vias in the power supply layer. Reference numeral 1 denotes a thermal land for connecting to the conductor pattern, 3 denotes a first clearance which functions to electrically insulate the through-hole connection portion and the conductor layer 1 forming the power supply layer, and 4 denotes a conductor forming the power supply layer with the wiring pattern 5. This is a second clearance having a function of electrically insulating the layer 1 from the layer 1.

In the printed wiring board design support system according to the present invention, when the mask pattern is created by CAD, first, all of the negative information and the positive information of the same wiring layer held by the database holding means 7 are negative or positive. The necessary negative information and positive information are replaced by either one of the positive and negative information and the positive information are synthesized by the information synthesizing means 9 to create negative-positive synthetic information as shown two-dimensionally in FIG.

Next, with respect to the synthesized image, verification data previously input to the database holding means 7 by the verification means 10 for synthesized data, in other words, an insulating base plate or a conductor pattern forming an insulating layer of the printed wiring board. The computer checks and verifies the design rules based on the design information related to the design, the electrical characteristics of the printed wiring board to be designed, and the geometrical design rules determined from the manufacturing process. FIG. 5 schematically shows the form of the verification data used for design rule check / verification of the synthesized data. Pad 11a-area 11b, pin 11c-area 11b
, Line 11d-area 11b, area 11b-area 11e
By checking and verifying the design rules for each of the gaps, it is possible to confirm whether required negative design information-positive design information has been synthesized or combined in a so-called drawing process. It is possible to avoid the occurrence of defective products of the board and to improve the yield of the mask pattern or the printed wiring board.

If it is confirmed that there is no mistake in the synthesis verification, the negative conductor pattern data of the conductor layer 1 constituting the power supply layer inputted to the database holding means 7 is shown in FIG. While outputting the illustrated negative information, from the positive conductor pattern data relating to the same wiring pattern layer, which is also input to the database holding means 7, as part of the positive conductor pattern data,
The positive information shown two-dimensionally in FIG. 4 is output, and it is confirmed in advance whether the output negative information and positive information are information required for design.

[0016]

As described above, according to the printed wiring board design support system according to the present invention, at the stage of designing the printed wiring board, a part of the negative design information and the positive design information which form the same wiring layer is selected. In addition to this, it is possible to perform partial confirmation by outputting the information on the other hand, and on the other hand, replace all the design information in the same wiring layer with either negative or positive to easily form a highly reliable composite pattern layer, and Can be set reliably. That is, a selective division of negative design information and positive design information, the possibility of synthesizing the same wiring layer as negative / positive information, and the possibility of checking and verifying the synthesized information enable a fatal error in a short time. Thus, a required wiring pattern can be drawn, which has been solved. And
The division / selectivity of the design information means that the data amount as a database is at least good, thereby shortening the time required for outputting the design information, and inputting / writing to a recording medium.
Since the number of design information to be held can be reduced, the printed wiring board design support system itself can be simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a printed wiring board design support system according to the present invention.

FIG. 2 is a plan view showing an example of a pattern synthesized with a part of negative design information and positive design information.

FIG. 3 is a plan view showing an example of negative information used for synthesizing the pattern example shown in FIG. 2;

FIG. 4 is a plan view showing an example of positive / negative information used for synthesizing the pattern example shown in FIG. 2;

FIG. 5 is a plan view showing an example of verification data used for checking and verifying synthetic information synthesized with a part of the negative design information and the positive design information in the printed wiring board design support system according to the present invention.

FIG. 6 is a plan view showing an example of negative design information.

FIG. 7 is a plan view showing an example of a pattern obtained by inverting the positive design information of the synthetic information synthesized with the conventional negative design information and positive design information.

FIG. 8 is a plan view showing an example of a conventional positive mask pattern.

FIG. 9 shows an example of drawing a positive mask pattern in a conventional printed wiring board design support system. FIG. 9 (a) is a flowchart for separately verifying and outputting required negative design information and positive design information. ) Is a flowchart in the case where all required design information is verified and output as positive design information.

[Explanation of symbols]

1 ... conductor layer (power supply layer) 2 ... thermal land 3 ...
1st clearance (through hole connection) 4 ... 2nd
5: Wiring pattern 6, 7: Database holding means 8: Data output means 9: Output data synthesizing means 10: Synthetic data verification means

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-144768 (JP, A) JP-A-5-289303 (JP, A) JP-A-2-109172 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) G06F 17/50 666 G06F 17/50 658 G06F 17/50 628 JICST file (JOIS)

Claims (1)

(57) [Claims] 1. A database holding means for inputting and holding verification data, negative and positive conductor pattern design data of each wiring layer, and negative conductor pattern design data and a part of the same wiring layer held by the database holding means. Data output means for selectively outputting the positive conductor pattern design data as positive conductor pattern design data; and all of the negative conductor pattern design data and the positive conductor pattern design data of the same wiring layer held by the database holding means as either positive or negative. A printed circuit board comprising: data synthesizing means for replacing and synthesizing the design data; and verification means for synthetic data for checking and verifying the design data synthesized by the data synthesizing means based on the verification data. Design support system.