JPS6373589A - Printed board - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a printed circuit board that enables high-density wiring of patterned conductors including lands.

<Prior Art> In the case of a conventional printed circuit board, as shown in FIG. 5, the land 2 portion of the pattern conductor 1 is functionally larger than the line width of the conductor 1, and is generally circular, with its center pointing toward the pattern conductor. Since it is formed so that 1 passes through, 2 of land 2
A portion (for example, the top and bottom in the figure) protrudes a little from the 1 portion of the conductor extending left and right.

<Problems to be Solved by the Invention> In the case of such conventional printed circuit boards, for example, due to technical constraints in circuit formation, the minimum conductor width that can be formed is 0.
5mm, and the minimum conductor spacing is 0.5mm, and if the diameter of the land 2 part is 1.5mm, the one pitch P between the conductors is
is 1.5 mm, and the distance between the outer edges of adjacent conductors 1.1 is 1.9 mm.

Therefore, when land 2 is present at -a, it is impossible to perform conductor wiring with the conductor spacing narrowed to the maximum technical limit in conductor formation. In other words, it has been difficult to increase the density of conductor wiring.

The present invention has been made in view of such conventional circumstances.

<Means for solving the problem and its operation> The feature of the present invention is that unlike the conventional method, two places on the land (
For example, instead of having the pattern conductor extending horizontally, vertically, etc.) from the line width of the pattern conductor, centering on the land, the pattern conductor is placed on one side of the appropriate portion of the land (
This is due to the fact that it is formed in line with (aligned with) the outermost edge.

More specifically, in the case of the present invention, in a printed circuit board that has an area in which a plurality of patterned conductors having lands are wired in parallel in the same direction, both patterns extend horizontally or vertically with the land as the center. This is a printed circuit board in which the outer edge of one (one side) of the conductor is formed to match the outermost edge of the land.

Thereby, as will be described later, the spacing between the pattern conductors can be set to the minimum conductor spacing, and the density of the conductor wiring can be increased.

<Embodiment> FIG. 1 shows an embodiment of a printed circuit board according to the present invention.

In this printed circuit board, when a plurality of pattern conductors 11 having lands 12 are wired in parallel in the same direction, one of the pattern conductors 11a (on the left side in the figure) extends left and right in the figure with the land 12 as the center. ) is the outermost edge 12a of one of the lands 12 (upper top in the figure).
(as a tangent line), and the other side 11b (right side in the figure) of the pattern conductor has its one side outer 1113b aligned with the opposing outermost edge 12 of the land 12 opposite to the outermost edge 12a.
b (lower bottom) and formed (as a tangent).

Therefore, the land area 2 does not protrude from the line width of the pattern conductor 11, and in these pattern conductors 11, for example, when the minimum conductor width that can be formed is 0.5 mm and the minimum conductor interval is Q, 5 mm. Therefore, even if the diameter of the land 12 portion is l, 5 mm, the one pitch P between the conductors can be l, Qn'+m, and accordingly, the distance between the outer edges of adjacent conductors 11 and 11 is Q. , 5mm. In other words, conductor wiring can be performed with high density.

Note that the shape of the land is not limited to the above-mentioned circular shape; for example, as shown in FIG.
etc. is possible.

3 and 4 show other embodiments of printed circuit boards according to the present invention.

These printed circuit boards are also essentially the same as those shown in FIG.

This is a case in which the direction of the conductor 11b, the way it is attached to the land 12, and its location are different, and a curved pattern conductor 11C is inserted as a relay if necessary.

Even in these embodiments, when the number of conductors is small, the one pitch P between the conductors is set to 1. Qmm. Of course, this reduces the distance between the outer edges of adjacent conductors 11 and 11 to 0.
．． It becomes possible to set it to 5 mm. In other words, conductor wiring can be performed with high density.

In short, in the present invention, two places on the land (
For example, instead of having the pattern conductor extending horizontally, vertically, etc.) from the line width of the pattern conductor, centering on the land, the pattern conductor is placed on one side of the appropriate portion of the land (
If the pattern conductors are formed along the outermost edge (outermost edge), then by appropriately combining the formed pattern conductors,
The spacing between pattern conductors can be the minimum conductor spacing.

<Effects of the Invention> As is clear from the above description, according to the present invention, in a printed circuit board having an area in which a plurality of pattern conductors having lands are wired in parallel in the same direction, ■ the interval between the pattern conductors; It is possible to obtain a printed circuit board with high-density wiring in which the conductor spacing is narrowed to the minimum conductor spacing. Also, in order to obtain this printed circuit board, there is no need to change special equipment or equipment, and it can be carried out as usual. Furthermore, for example, when connecting a land and a pattern conductor with a gentle curve in order to improve the yield during circuit formation, in the present invention, the land and pattern conductor can be connected with a gentle curve as shown in FIG. 6(A). The pinch length J in the horizontal direction between the lines can be made smaller than the pitch length 12 of the conventional example shown in FIG. can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing an embodiment of a printed circuit board according to the present invention, FIGS. 2A to 2C are schematic plan views showing other shapes of lands, and FIGS. 4 is a schematic plan view showing each embodiment of another printed circuit board according to the present invention, and FIG.
The figure is a schematic plan view showing an example of a conventional printed circuit board, and FIGS. 6(A) and 6(B) are respective schematic plan views comparing the effects of the present invention and the conventional example. In the figure, 11... Pattern conductor, 11a... One of the pattern conductors, 11b... Other pattern conductor, 12... Land, 12a, 12b... Outermost edge of land, 1'3a, 13
b... Outer edge of pattern conductor, patent applicant Fujikura Electric Wire Co., Ltd. Figure 1 Figure 2 (A) Figure 2 (B) Figure 2 (C) Figure 3 Figure 4 Figure 1b

Claims (2)

[Claims] (1) In a printed circuit board with an area in which a plurality of patterned conductors each having a land are wired in parallel in the same direction, the outer edge of one (one side) of both patterned conductors extends horizontally, vertically, etc. with the land as the center. A printed circuit board characterized in that a printed circuit board is formed to match the outermost edge of the land. (2) One of the two pattern conductors extending left and right or up and down has one outer edge aligned with the outermost edge of one of the lands, and the other pattern conductor has one outer edge aligned with the outermost edge of the land opposite to the outermost edge of the land. The printed circuit board according to claim 1, wherein the printed circuit board is formed to match the opposing outermost edges.