JPS6113684A - Pattern structure of printed board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pattern structure of a printed board, and particularly to a pattern structure having a wide area pattern.

Mounting components are mounted on printed circuit boards with high density, and with digitalization, power supply patterns and ground patterns are strengthened, so these patterns cannot be handled by thick line patterns and cover almost the entire surface of the printed circuit board. A pattern with a large area is required.

This wide-area pattern also requires through-holes for terminal insertion, as in other pattern areas. There are two types of through-hole lands: isolated lands that connect to other conductor layers, and connection lands that connect to the wide-area pattern.

At this time, as with other devices, there is a strong demand for low-cost printed boards.

[Conventional technology]

A conventional printed board of this type has a structure as shown in FIG.

Figure 2 shows a conventional printed board with a wide area pattern (
(a) is a plan view, and (b) is an enlarged view of main parts.

The printed board 1 is, for example, a backboard of a printed board unit, and is a double-sided printed board with conductor layers formed on the front and back sides. On the entire surface of the printed board 1,
For example, a wide area pattern 2, which is a power supply pattern, is formed, and rectangular land areas 3 for mounting a connector are provided in parallel in the wide area pattern 2.

The back side of the printed board 1 has the same shape as the front side, and is provided with a wide area pattern, for example, a ground pattern, and a land area.

Each land area 3 is insulated from the wide-area pattern 2 by a rectangular edge frame 4, and on the longitudinal center line of the edge frame 4 are rectangular areas into which connector terminals are inserted at desired grid intervals. Connection lands 5 and isolated lands 6 are arranged in parallel in one row. Note that the holes of each land are not shown.

At least two of the four sides of the connection land 5 are connected to the wide-area pattern 2 by linear connection patterns 7.

Among the isolated lands 6 on the surface layer, there are those whose back surfaces serve as connection lands and which are connected to the ground, and those which are connected to the ground on both the front and back surfaces.
There are isolated cases where the signal terminal passes through.

The signal terminal passing through this isolated land is connected to printed board 1.
It is connected to other signal terminals or external circuits, for example, by wrapping connection, etc., on the back side of the .

In this way, the printed board 1 strengthens the power supply pattern and the ground pattern by the wide area pattern 2, and
The cost is reduced by using a double-sided printed board.

On the other hand, positive photomasks are widely used to form patterns on the printed board 1 because they are highly accurate, easy to manufacture, and inexpensive.

That is, the automatic drafting machine tape obtained with a digitizer can be used to connect lands that require precision that cannot be achieved manually.5. Only the isolated land 6 is drawn using an automatic drawing machine, and the area section divided by straight lines, that is, the wide area pattern 2, which requires much less man-hours and can be easily achieved manually, is manually filled in. Manufacture a positive photomask.

If you want to fill in the wide area pattern 2 with an automatic drawing machine, first make a tape for the automatic drawing machine that takes a lot of man-hours to manufacture, and then use this tape for the automatic drawing machine to draw it on the automatic drawing machine. , the Apasochia, which is at most 2.5 am in diameter, is painted over by repeating several hundred back and forth movements. Therefore, it is faster to manually process the large area pattern 12.

[Problem that the invention seeks to solve]

However, in the above conventional connection land, the number of connection patterns differs depending on the insertion position in the edge frame and the type of adjacent land, so there is a problem of increased man-hours of manufacturing tape for automatic drafting machines each time. There is a problem that the number of connection patterns varies depending on the position of the connection land, and the quality is not constant.

On the other hand, if a signal line pattern is required, either an additional signal line pattern layer is added to make a three-layer printed board, or a signal line pattern is provided on both two layers on both sides.
Either one is used, such as using a negative photomask. All of these problems are obstacles to reducing the cost of printed boards.

[Means for solving problems]

One of the above conventional problems is that the through-hole pattern in the center of the isolated land and the square outer pattern are separated by an insulating ring, and the connection land has the same shape as the isolated land.
A plurality of radial connection patterns are formed on the insulating ring portion, a rectangular land area is provided within the wide area pattern of the printed board, and the connection land and the isolated land are formed in parallel in the land area. This problem is solved by the means of the present invention.

[Effect]

That is, according to the means of the present invention, both the connecting land and the isolated land are standardized, so that when manufacturing a tape for an automatic drafting machine, it is easy to manufacture the tape by simply specifying its position. , and its quality is stable.

Further, by forming a signal line pattern within a rectangular signal line pattern area of a double-sided printed board, it is possible to use a positive photomask in which a wide area pattern is manually filled in.

〔Example〕

The gist of the present invention will be specifically explained below with reference to illustrated examples.

In the first part, (a) is a plan view of one embodiment of the present invention, and (b) is an enlarged view of the main part.

The printed board 11 is, for example, a backboard of a printed board unit, and is a double-sided printed board with conductive layers formed on the front and back sides. A wide-area pattern 12, which is, for example, a power supply pattern, is formed on the entire surface of the printed board 110, and along the side edges of the wide-area pattern 12, a signal line pattern area 21 is defined by an elongated rectangular edge frame 23. is provided. A desired signal line pattern 22 is formed in the signal line pattern area 21 .

Further, adjacent to the signal line pattern area 21, a land area 13 for mounting a connector is partitioned by a rectangular edge frame I4.
are arranged in parallel.

The back side of the printed board 1 has the same shape as the front side, and is provided with a wide area pattern, for example, a ground pattern, a signal line pattern area, and a land area.

Each land area 13 has a connecting land 15 as desired.
and isolated lands 16 are inserted in one row in the longitudinal direction of the edge frame 14 and arranged in parallel.

The isolated land 16 has a circular through-hole pattern 17 in the center and a square outer pattern part 2 connected to the edge frame 14.
0 are separated by an insulating ring 18.

The connection land 15 also includes a through-hole pattern 17 having the same shape as the isolated land 16, and an outer pattern portion 20. and an insulating ring 18, and the insulating ring 18 further includes:
A plurality of radial lines (4 in the figure) are provided in a pinch to connect the through-hole pattern 17 and the outer pattern part 20.
A connecting pattern 19 of a book) is provided.

Note that the respective holes of the isolated land 1G and the connection land 15 are not shown.

Regarding the width of the isolated land 16 on the surface layer, there are two types: one where the back surface becomes a connection land and is connected to the ground, and the other where both the front and back surfaces are isolated lands and a signal terminal passes through them.

As mentioned above, the connecting land 15 and the isolated land 16 are
Since all of them are standardized, when producing a tape for an automatic drafting machine, it is possible to tape the shape simply by specifying its position. Therefore, it is easy to continuously fit them into the edge frame 14 using an automatic drafting machine.
A highly accurate photomask can be obtained. That is, the printed board 11
The quality of the land area is stable.

Further, it is extremely easy to draw the signal line pattern 22 in the rectangular signal line pattern area 21 of the printed board 11, which is a double-sided printed board, using an automatic drawing machine, and the land area 13. Edge frame 14 formed of straight lines other than signal line pattern nod 3fU21. Wide area pattern 12 outside the edge frame 23
It is easy to manufacture a positive photomask obtained by manually filling in the .

Although the embodiment has been described with reference to a backboard printed board, it is of course applicable to other printed boards and multilayer printed boards on which components are directly mounted.

0
1+.

〔Effect of the invention〕

As explained above, the present invention relates to a power supply pattern.

It has excellent practical effects, such as allowing the earth pattern to have a wide area, providing a land portion with stable quality, allowing the use of a positive photomask, and reducing the cost of the printed board.

[Brief explanation of drawings]

Fig. 1 shows (a) a plan view of an embodiment of the present invention, (b) an enlarged view of the main parts, and Fig. 2 shows (a) a plan view of a conventional printed board, and (b) shows an enlarged main part. It is a diagram. In the figure, 1.11 is a printed board, 2.12 is a wide area pattern, 3.13 is a land area, 4.14.23 is an edge frame, 5.15 is a connection land, 6.16 is an isolated land, 7. I9 is a connection pattern, 17 is a through-hole river pattern, 18 is an insulating ring, 20 is an outer pattern portion, 21 is a signal line pattern area, and 22 is a signal line pattern. Agata\ ('wcz to C', he

Claims (1)

[Claims] The isolated land has a through-hole pattern in the center and a rectangular outer pattern part separated by an insulating ring, and the connecting land has the same shape as the isolated land, and a plurality of radial connection patterns are formed in the insulating ring part, A pattern structure of a printed board, characterized in that a rectangular land area is provided in a wide area pattern of a printed board, and the connection land and the isolated land are formed in parallel in the land area.