JPH0554101A - Masking data generator - Google Patents

Abstract

(57) [Abstract] [Purpose] Automatically and accurately generate masking data for protecting the circuit wiring pattern of a printed circuit board by coating it with an insulating resin. [Structure] Information regarding through holes, land shapes, pad shapes, and mechanical holes that require masking clearance is obtained from information files c and d, and masking clearance values for each of these are input and set from an input section f. . Masking escape pattern data is generated in accordance with the clearance setting value, and the masking escape pattern for the wirable area g of the printed circuit board is expanded to generate the final masking data i.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a masking data generator, and more particularly to a masking data generator for generating masking data for protecting a circuit wiring pattern of a printed circuit board by coating it with an insulating resin.

[0002]

2. Description of the Related Art In a conventional masking data generator of this type, a designer manually inputs a masking area. At this time, however, it is necessary to designate a masking escape pattern for an area that should not be masked. is there.

The parts required for this masking escape pattern are, for example, through-hole lands, component-mounting through-hole lands, component-mounting pads, machine holes for screwing machine parts and connectors, and the like. A masking escape pattern is assigned in advance to the portion before the masking data design, and after the wiring and the component layout design, this masking escape pattern is expanded in the masking area and output to the outside as the entire masking data.

In the conventional masking data design system of this type, since the outer peripheral figure indicating the masking area is manually input, the wiring pattern or the through-hole land protrudes from the outer peripheral figure or the outer peripheral figure is closed. There is a possibility that an input error such as a non-figure may occur.

Further, it is necessary to separately define a masking escape pattern for a front surface and a back surface for a land of a through hole, a component mounting pad, etc. Therefore, there is a disadvantage that a lot of man-hours are required for library design. is there.

Further, if the clearance between the masking escapes is smaller than a certain value or if the masking escapes overlap each other, a solder bridge may occur between the terminals during soldering.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a masking data generator which automatically generates masking data including a masking escape pattern so that accurate masking data can be generated with a small number of steps.

[0008]

According to the present invention, there is provided a masking data generator for generating masking data for protecting a circuit wiring pattern of a printed circuit board by coating it with an insulating resin, the wiring area of the circuit wiring pattern. From the design data, means for inputting data of through holes, land shapes, component mounting pad shapes, machine holes for screwing machine parts and connectors, and the through holes, land shapes, parts A means for setting a masking clearance value for each mounting pad shape and machine hole, and masking escape pattern data for each of the through hole, land shape, component mounting pad shape, and machine hole according to the set clearance value. A means for generating, and the generated masking escape pattern data for the wiring area. Comprise means for generating a total masking data by adding Te masking data generating apparatus according to claim is obtained.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is an example of a block diagram of the present invention. The device according to the embodiment of the present invention is an external file input / output device a.
, A masking data generator b, a masking area storage area j, a masking escape shape storage area k, a storage area for storing each position of a through hole land, a component mounting through hole land, a component mounting pad, and a machine hole position. 1 and a development masking area m.

Component placement information c and wiring pattern information d
, Parts library e, masking clearance value f
, The wirable area information g, and the design reference information h as input, and after performing the processing described below, the masking data i
Is output.

Next, FIGS. 2 and 3 show processing flowcharts of the embodiment of the present invention, and the processing method of this apparatus will be described.

First, in process 1, the wirable area of the printed circuit board (PWB) is input by the external file g. Process 2
The outer peripheral figure surrounding the wirable area is extracted with and is stored in the masking area storage area j. FIG. 4 shows an example of the wirable area, which is indicated by diagonal lines.

In processing 3, the land shape of the through through hole (T / H) land / component mounting through hole land, the component mounting pad shape, and the machine hole diameter contained in the design standard information file h are extracted and processed. In step 4, the clearance clearance value for masking is set for each of the front layer side and the back layer side of the printed circuit board.

In process 5, each of the through-through land land, component mounting through-hole land, component mounting pad shape and machine hole diameter input in process 3 is expanded by the masking clearance clearance value set in process 4. Similar figures are calculated for the front and back layers and stored in the masking escape figure storage area k. In the figure showing an example of the masking escape figure in FIG. 5, the solid line is the masking escape figure, and the broken line is the design shape.

In process 6, the component placement information and the component library are input from the outside, and in process 7, the positions of the component mounting through-hole land, the component mounting pad, and the machine hole are developed in the masking area, and the through-hole land / component mounting is performed. Store in through-hole land, component mounting pad, and machine hole position storage area l.

Next, in process 8, the wiring pattern information of the printed circuit board is input from the outside, and in process 9, the positions of the through through-hole lands are extracted, and the through through-hole lands, component mounting through-hole lands, component mounting pads, machines Store in the hole position storage area l.

In the process 10, the masking escape pattern on the surface layer calculated in the process 5 is assigned to the positions of the through-hole land, the component-mounting through-hole land, the component mounting pad, and the machine hole, and is developed in the masking area and developed. Store in masking escape figure storage area k.

Next, in process 11, the clearance between the masking escape patterns on the surface layer developed in process 10 is checked. If the clearance values are less than a certain value or overlap, a solder bridge may occur during soldering, so a warning message is issued in process 12.

In process 13, the masking escape pattern of the back layer calculated in process 5 is assigned to the positions of through-holes, component-mounting through-hole lands, component-mounting pads (in the case of back-side mounting), and machine holes, and masking is performed. The area is expanded and stored in the expanded masking escape pattern storage area m.

In process 14, the clearance between the masking escape patterns on the back layer developed in process 13 is checked. If the clearance value is less than a certain value or there is an overlapping portion, a warning message is issued in process 15.

Next, in processing 16, the masking area graphic obtained in processing 2 is taken out as positive data, and the expanded masking escape graphic obtained in processing 10 and 13 is taken out from the expanded masking escape graphic storage area m, and this is used as negative data on the surface layer. Output masking data for each back layer to the external file j. An example of masking data at this time is shown in FIG.

[0023]

As described above, according to the present invention, the masking area is extracted not from the manual input but from the outer peripheral data of the wiring area at the time of designing the printed circuit board. Therefore, the wiring pattern and the land are projected outside the masking area. As the effect of eliminating mistakes, etc. and the masking escape pattern for through-hole lands, component mounting pads, and machine holes are calculated from the set clearance values, one masking escape pattern is created in the library like the conventional system. The effect of reducing the number of man-hours required to create and manage the library and the clearance check between masking escape patterns are performed, so soldering bridges caused by insufficient masking in narrow spaces between component mounting pads Has the effect of preventing this.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart of operation processing according to the embodiment of this invention.

FIG. 3 is a flowchart of operation processing according to the embodiment of this invention.

FIG. 4 is a diagram showing a wirable area of a printed circuit board.

FIG. 5 is a diagram showing an example of a masking escape figure.

FIG. 6 is a diagram showing an example of masking data.

[Explanation of symbols]

 a External file input device b Masking data generator c Parts placement information file d Wiring information file e Parts library file f Masking clearance setting input part g Wiring area information file h Design standard information file i Masking data jm Data storage area

Claims (1)

[Claims] 1. A masking data generator for generating masking data for protecting a circuit wiring pattern of a printed circuit board by coating with an insulating resin.
Means for extracting a wiring area of the circuit wiring pattern from design data, means for inputting each data of through hole, land shape, component mounting pad shape, machine hole for screwing a machine part or connector, Through hole,
Means for setting a masking clearance value for each of the land shape, the component mounting pad shape, and the machine hole, and the through hole according to the set clearance value,
Means for generating masking escape pattern data for each of the land shape, the component mounting pad shape, and the machine hole, and the generated masking escape pattern data is added to the wiring area to generate the entire masking data. And a masking data generating device.