JPH04241676A - Pattern data structure of printed wiring board - Google Patents

Abstract

PURPOSE:To make the formation of a land arbitrarily changeable by assembling the pattern data structure of the land of a basic land and numeral small land pieces. CONSTITUTION:In a land 1, a basic land 4 is provided concentrically to a virtual through hole 3. The basic land 4 has the minimum land size which cannot be divided further. Then plural land pieces 2 are adjacently put around the basic land 4 in such a way that a doughnut-like ring formed of the land pieces 2 is divided by radial slits from the center point and a circular land 1 is formed as a whole. In addition, a pattern 4 is provided near the land 1 and a gap is secured between the pattern 5 and land 1 by deleting part of the land pieces 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pattern data structure for a printed wiring board, and more particularly to a pattern data structure constituting a land shape, which is input when performing wiring processing on a computer or the like.

0002

2. Description of the Related Art Conventionally, in a pattern input data structure of a printed wiring board for computer processing, the shape of a land is set to be a circle, a polygon, or an irregular shape having an area and an arbitrary size.

As shown in FIG. 6, a land 1 having a circular periphery is set at an arbitrary diameter in a portion of a virtual through hole 3.

Furthermore, in FIG. 7, long sides of arbitrary length,
There was a rectangular land 1 with short sides.

Once the shapes of these lands 1 are determined, the shapes are uniformly defined as basic data. This indicates that the shape of land 1 is fixed and defined as the minimum unit that cannot be divided based on the pattern data of the printed wiring board.

[0006] Therefore, once a land shape has been defined, it basically cannot be changed to another shape, and if it is desired to increase the land area, it is necessary to specifically define a unique shape. In this case, it was necessary to define many lands with unique shapes.

[0007]

[Problem to be Solved by the Invention] Once the shape of the land of the pattern of the conventional printed wiring board mentioned above is determined,
The shape must always be set as it is, and it is necessary to set a different shape in locally high-density areas. The drawback is that it requires setting many types and clearly managing restrictions on where they can be used.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pattern data structure for a printed wiring board that solves the above-mentioned drawbacks and allows the shape of the land to be arbitrarily changed.

[0009]

[Means for Solving the Problems] The configuration of the present invention is to provide a basic land in a virtual through hole portion in a pattern data structure of a printed wiring board that constitutes a land shape of the printed wiring board, and to provide a basic land around the basic land. It is characterized in that a plurality of connected land pieces having a minute area are provided, and in particular, the required number of land pieces is reduced depending on the pattern density around the land, and a gap between the pattern and the land is ensured. Features.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view showing a pattern data structure of a printed wiring board according to an embodiment of the present invention.

In FIG. 1, in the land 1 of the pattern data structure of this embodiment, a basic land 4 is provided on a concentric circle of a virtual through hole 3. This basic land 4 has a minimum land size that cannot be made any smaller. Connected to the basic land 4, the land side 2 has a donut-shaped ring divided by radiation from the center point,
There are multiple locations. A circular land 1 is formed as a whole.

In another embodiment shown in FIG. 2, a virtual through hole 3 and a rectangular basic land 4 are provided at the center, as in FIG. 1. A plurality of land pieces 2 are provided in a rectangular shape (lattice shape) connected to the basic land 4, forming a rectangular land 1 as a whole.

FIGS. 3, 4, and 5 are plan views showing high-density wiring using the land pattern data structure of FIG. 1 or 2.

In FIG. 3, a pattern 5 is arranged close to the land 1 in FIG. 1, and a part of the land piece 2 of the land 1 is removed to ensure a gap between the pattern 5 and the land 1. It is.

In FIG. 4, a pattern 5 is arranged close to and parallel to one side of the rectangular land 1 in FIG. This is an example of securing

In FIG. 5, pattern 5 is arranged obliquely close to the side of land 1 in FIG. This is an example in which a gap with 1 is secured.

[0017]

Effects of the Invention As explained above, the present invention has a land pattern data structure consisting of a large number of basic lands and small land pieces. By removing an arbitrary number of pieces from arbitrary locations, it is possible to arrange patterns with high density without reducing the area as much as possible.

Particularly, when the present invention is applied not only to lands but also to surface mounting pads, it is effective in improving soldering reliability and mechanical adhesion.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the shape of a land according to an embodiment of the present invention.

FIG. 2 is a plan view showing the land shape of another embodiment of the present invention.

FIG. 3 is a plan view showing an example of how the land shown in FIG. 1 is used.

FIG. 4 is a plan view showing an example of how the land in FIG. 2 is used.

FIG. 5 is a plan view showing another usage example of the land shown in FIG. 2;

FIG. 6 is a plan view showing one shape of a conventional land.

FIG. 7 is a plan view showing another shape of a conventional land.

[Explanation of symbols]

1 Land 2 Land piece 3 Virtual through hole 4 Basic land 5 Pattern

Claims (2)

[Claims] 1. In a pattern data structure of a printed wiring board constituting a land shape of a printed wiring board, a basic land is provided in a virtual through hole portion, and a land piece having a minute area is connected to the periphery of the basic land. A pattern data structure for a printed wiring board characterized by having a plurality of patterns. 2. The pattern data structure of a printed wiring board according to claim 1, wherein a required number of land pieces is reduced depending on the pattern density around the land, and a gap between the pattern and the land is secured.