JPH0756907B2 - Printed wiring board - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a printed wiring board, and more particularly to a printed wiring board in which five conductor patterns are passed between through holes for mounting components of 2.54 mm or 2.54 mm pitch.

[Conventional technology]

Fig. 3 shows 5 between the through holes for mounting parts of 2.54mm pitch.
It is a top view of the printed wiring board which lets the conductor pattern of a book pass. As shown in FIG. 3, the conventional printed wiring board has a pitch dimension P1 to P10 (P1 to P10 = 0.254 mm is often used) between a through hole T1 of 2.54 mm pitch and a land L1 connected to the through hole. Thus, five conductor patterns C1 to C5 are arranged and formed. Conductor patterns C1 to C5 are usually electrically independent between adjacent comrades, and through holes for component mounting in the path.
It is connected to T1 (not shown), and the desired electrical connection is made. In addition, the conductor pattern C3 has a through hole T2 disposed in the path, and the conductor pattern C3 and the through hole
T2 is connected, the conductor pattern C3 'is connected on the opposite surface side, is connected to the through hole T1 (not shown) in the path, and desired electrical connection is made.

[Problems to be Solved by the Invention]

However, according to the arrangement of the conductor patterns in FIG. 3,
The outermost conductor patterns C1 and C5 and the center conductor pattern C3 can be easily connected to the through hole T1, but when connecting the inner conductor patterns C2 and C4 to the through hole T1, the outer conductor The part where the patterns C1 and C5 are arranged becomes a blind alley, and the conductor patterns C1 and C5
As a result, the line lengths of the conductor patterns C2, C4 become longer, and the pattern accommodation of the printed wiring board deteriorates, limiting the line length of the conductor pattern during high-speed operation. There were drawbacks such as not being able to protect it.

[Means for Solving the Problems]

According to the present invention, in a printed wiring board in which five conductor patterns are arranged between the component mounting through holes provided at the adjacent grid points of the 2.54 mm or 2.5 mm grid, the square-shaped closest four grid points At least two hole diameters φ0.5mm with a certain gap around the center of the square inside
A printed wiring board is obtained which has the following through holes and is connected to a desired conductor pattern.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of a printed wiring board showing an embodiment of the present invention. The arrangement standard of the component mounting through hole T1 corresponds to FIG. In FIG. 1, four through holes T3 are symmetrically arranged around the center point O of the four component mounting through holes T1 provided at grid points of 2.54 mm pitch. The five conductor patterns C1 to C5 pass between the component mounting through holes T1 and the conductive patterns C2 to C4 are connected to the through holes T3,
The conductive patterns C1 and C5 pass between the component mounting through holes T1 and T3. Conductive patterns C2 to C4
Is connected to the conductor pattern on the opposite side (only the conductor pattern C3 'is shown) via the through hole T3, and is connected to the component mounting through hole T1 (not shown).
T3 may be arranged asymmetrically if the center point O is rotated. Further, the hole diameter of the through hole T3 is accommodated between the component mounting through holes T1 provided at the grid points of the pitch of 2.54 mm, and therefore, a diameter of 0.5 mm or less is usually suitable. It goes without saying that the through hole T1 can be arranged at the same location as the reference other than that shown in the drawing, and that the conductor patterns C1 and C5 can be connected to the through hole T3. Also, the conductor pattern C1
The bending points of ~ C5 can adjust the gap between the conductor patterns C1 ~ C5 by changing the dimensions of the pitches P1 ~ P10.
The shapes of the lands L1 and lands L3 connected to the component mounting through holes T1 and T3 are octagonal and circular, respectively, but they may be octagonal, circular, quadrangular or other shapes.

FIG. 2 is a plan view of a printed wiring board according to another embodiment of the present invention. An example in which two through holes T3 are deleted in FIG. 2 in the position where four through holes T3 are arranged in FIG. 1 and the conductor pattern C3 does not need to be connected in the route Is. If any of the conductor patterns C1 to C5 needs to be connected, the through hole T3 should have the same concept.
You can make them individually.

〔The invention's effect〕

As described above, according to the present invention, the inner conductor patterns of the five conductor patterns can be selectively rerouted by the through holes based on the four conductors in the minute portion. Therefore, the connection length of the conductor patterns can be minimized or optimized. Therefore, there is an effect that the accommodability of the conductor pattern is improved, and the line length limitation at the time of high speed operation can be easily realized.

[Brief description of drawings]

FIG. 1 is a plan view of a printed wiring board according to an embodiment of the present invention, and FIG.
FIG. 3 is a plan view of a printed wiring board according to another embodiment of the present invention, and FIG. 3 is a plan view of a conventional printed wiring board. 1 ... Base material, C1 to C5, C3 '... Conductor pattern, L1 to L3 ...
… Land, O …… Center point, P1 to P10 …… Pitch, T1 ……
Through holes for component mounting, T2, T3 ... through holes.

Claims (1)

[Claims] 1. A printed wiring board in which five conductor patterns are arranged between component mounting through-holes provided at adjacent grid points of a 2.54 mm or 2.5 mm grid, and the square-shaped four of the most adjacent grid points are provided. Desirably, at least two through-holes having a hole diameter of 0.5 mm or less and having a predetermined distance are arranged at positions equidistant from the center point of the square shape on one of the three inner sides of the conductor pattern. The printed wiring board is characterized in that the five conductor patterns are arranged in point symmetry with respect to the center point in the square shape while being connected to the conductor pattern.