JPH03185568A - Method and device for plotting printed substrate mask - Google Patents

Abstract

PURPOSE:To prevent the generation of pattern thinning or slits and to improve mask quality and design efficiency based upon easy input operation by synthesizing divided graphics at the time of forming mask plotting data. CONSTITUTION:In the case of forming an area filling pattern 11, the pattern 11 is divided into graphics 12 to 14, which are inputted to an area filling pattern input part 5 by a digitizer 1 or a graphic processing terminal 2. The data of the divided graphics 12 to 14 are supplied to an area filling pattern synthesizing part 6 and synthesized as synthesized graphic data to obtain synthesized graphic data whose vertex consists of an outline plotting locus 16 formed by an aperture 15. Data are formed so that the generation of pattern thinning and slits is suppressed in the synthesized graphic. Then an area filling pattern mask plotting data forming part 7 obtains the area filling pattern data of a printed substrate mask based upon the synthesized graphic data. Consequently, the outline plotting locus 16 is not set up on the contact parts of respective divided graphics and the generation of pattern thinning and slits on the contact parts can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printed circuit board mask drawing method and apparatus using a CAD/CAM system.

(Prior art) Conventionally, when drawing a printed circuit board mask, Japanese Patent Laid-Open No. 64
As described in the -44580 publication, CAD/
Drawing is performed using a CAM system.

In this case, a digitizer or the screen of a graphics processing terminal is used to input the printed circuit board mask pattern into the drawing device, but when the board is an analog board with many vertices and many complicated fill-in patterns,
Input operations may be performed by dividing the shape into multiple shapes. Dividing the data into multiple parts in this way improves the operability during input.

For example, as shown in FIG. 6, three sets of patterns whose vertices are surrounded by a contour drawing locus 16 formed by an aperture 15 are input.

[Problem to be solved by the invention]

However, when inputting a pattern divided in this way, each divided drawing is regarded as an independent fill-in pattern and drawn.

Therefore, the aperture 1 forming the apex of each division pattern
Due to the roundness due to the diameter of No. 5, pattern thinning occurred at both ends of the contact portion of each divided pattern, and slits were sometimes generated at the contact portion. For example, if part A of Fig. 6 is
When enlarged in the figure, pattern thinning 17 occurs at the end of the contact portion between the trajectories 16, and slits 18 occur due to incomplete contact between the trajectories 16.

If this pattern becomes thinner and slits occur, the quality of the printed circuit board mask will deteriorate.

In order to solve this problem, for example, as shown in FIG. 8, when dividing the fill-in pattern into a plurality of parts, it is possible to provide a figure-shaped curved part 24 at the contact part of each divided pattern 21, 22, 23. Conceivable. However, if the overlapping portions are provided in this way, inputting the division pattern becomes very time-consuming.

SUMMARY OF THE INVENTION An object of the present invention is to easily eliminate the occurrence of slits when a pattern is inputted in parts and processed.

[Means to solve the problem]

In order to achieve the above purpose, I divided the shape and input it.
A composite figure is obtained by recognizing the connection relationship between a group of connected patterns, an outline is drawn using the obtained figure, and drawing data for a printed circuit board mask is obtained. Further, at this time, the composite figure is drawn so as to eliminate pattern thinning and occurrence of slits.

[Effect]

By drawing the outline of the pattern from the composite figure, unlike the case where the outline is drawn individually for each divided figure, contact parts do not occur, and the generation of slits when the pattern becomes thinner is prevented.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a diagram showing the overall configuration of a drawing device, in which 1 is a digitizer and 2 is a graphic processing terminal. The data is supplied to the fill-in pattern input section 5 of the drawing device 10 consisting of a system. The fill-in pattern data obtained from the input section 5 is once stored in the pattern data memory 3 and then supplied to the fill-in pattern synthesis section 6. The fill-in pattern combining unit 6 performs a process of combining a group of patterns that are divided and inputted into the input unit 5, and obtains outline data of the combined pattern. The contour data of this composite pattern is once stored in the pattern data memory 4, and then supplied to the fill-in pattern mask drawing data creation section 7, where a printed circuit board mask is drawn as a set of figures. Then, the printed circuit board mask data drawn by the fill-in pattern mask drawing data creation section 7 is supplied to the photoplotter drawing data storage section 8, and a print/M board mask is created by predetermined processing.

Next, the operation of drawing a printed circuit board mask using this drawing device will be explained. For example, a filling pattern 11 shown in FIG. 2 is created.

In this case, as shown in FIG.
The data is divided into two parts and input into the fill-in pattern input section 5 using the digitizer 1 or the graphic processing terminal 2.

The data of the divided figures 12, 13, and 14 are supplied to the fill-in pattern synthesis section 6 to form synthesized figure data, and the vertices are formed by the apertures 15 as shown in FIG. Composite figure data consisting of the contour drawing locus 16 is obtained. In this case, data is created so that pattern thinning and slits do not occur in the composite figure. Then, based on this composite figure data, the fill-in pattern mask drawing data creation section 7 obtains fill-in pattern data for the printed circuit board mask.

By creating the printed circuit board mask in this manner, the contour drawing locus 16 is not set at the contact portions of each divided figure, and pattern narrowing and slits do not occur at the contact portions. Therefore, the printed circuit board mask produced according to this example is of high quality without pattern thinning or slits. In addition, there is no need for overlapping processing of divided figures, and input work of divided figures can be easily performed.

Note that FIG. 5 shows an example of the filled-in pattern of the printed circuit board created according to this example. In FIG. 5, numeral 30 indicates a fill-in pattern, and a particularly large effect can be obtained with such a complicated pattern.

〔Effect of the invention〕

According to the present invention, since the bottom of the divided figures is determined at the stage of creating mask drawing data, generation of slits when the pattern is thinned is prevented, and design efficiency can be improved by improving mask quality and facilitating input operations.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a drawing device showing an embodiment of the present invention, Figs. 2, 3, and 4 are route diagrams for explaining the embodiment, and Fig. 5 shows an example of a printed circuit board mask. A plan view showing,
FIGS. 6, 7, and 8 are route maps for explaining conventional drawing methods. 5... Filling pattern input section, 6... Filling pattern synthesis section, 7... Filling pattern mask drawing data creation section, 11... Filling pattern, 12, 13.14... Divided figure, 15. ...Aperture, 16...Contour drawing locus.

Claims (1)

[Claims] 1. The method is characterized by recognizing the connection relationship of a group of connected patterns that are divided into figures and input into a drawing device, obtaining a set of composite figures, and drawing an outline using this composite figure. A printing method for printed circuit board masks. 2. The printed circuit board mask drawing method according to claim 1, wherein drawing is performed so as to eliminate pattern thinning and generation of slits at the contact portion of the composite figure. 3. Printed circuit board mask drawing characterized by having a compositing unit for a continuous pattern that is input by dividing figures, and a mask drawing data creation unit that obtains mask drawing data from the pattern synthesized by the compositing unit. Device.