JPH04142096A - Printed circuit board - Google Patents

Abstract

PURPOSE:To easily wire in an equal length without influence to wirings except a network to be wired in the equal length by equivalently forming the wiring length in a pseudo manner by using a board for regulating a delay value. CONSTITUTION:A board 2 for regulating a delay value is disposed and wired on a printed circuit board l similarly to other components. A wiring pattern 3 for regulating a delay value is provided on the board l, and a delay value is regulated by altering the length of the pattern 3. A delay module mounting through hole 7 is defined in an equal length wiring network 4, and so routed that the wiring length becomes shortest similarly to a network 5 except an equal length wiring. Thus, a roundabout wiring for matching the wiring lengths of the equal length wiring networks is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printed wiring board, and particularly to a printed wiring board that performs back-to-back wiring in the wiring design of the printed wiring board.

[Conventional technology]

Conventionally, as shown in Fig. 4, equal back wiring on printed wiring boards requires detour wiring to make the wiring lengths the same even when wiring can be done in the shortest possible length.
Detour wiring is performed to match the line length of the equal length whisker wire net 4a to b, and the net 5 that is not subject to equal back wiring is also wired so that the gap wiring length is the shortest in this detour wiring 4a. Was.

[Problem to be solved by the invention]

In the conventional printed circuit board wiring described above, the longest wiring among the wiring targeted for equal-back wiring is connected to the other wiring so that the length is equal to that of the other wiring. It has the disadvantage that it takes up a lot of area and also affects wiring that is not targeted for equal-back wiring.

[Means to solve the problem]

The printed wiring board of the present invention includes a delay value adjustment board for making the delay values of equal-back wiring pseudo-equivalent;
It has means for mounting the adjustment board.

〔Example〕

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

FIG. 1 shows an embodiment of the invention. In FIG. 1, one embodiment of the present invention is a printed wiring board equipped with a delay value adjustment board (delay module), and the delay value adjustment board 2 is placed on the printed wiring board 1 like other parts.
Wired.

FIG. 2 is an outline drawing of a delay value adjustment board (delay module) 2. A delay value adjustment wiring pattern 3 is provided on the printed circuit board 1, and by changing the length of this pattern 2, the delay value is adjusted.

FIG. 3 is a diagram showing an example of implementing equal length whiskers using a delay module, in which a through hole 7 for mounting a delay module is defined in the equal length whiskers net 4, and a net other than the target of equal length whiskers is defined. Similarly to 5, by performing routing so that the wiring length is the shortest, it is possible to perform detour wiring to match the line length of the equal length whisker wire net 4a to the equal length whisker wire net 4b as in the conventional method. Eliminate.

〔Effect of the invention〕

As explained above, the present invention uses a delay value adjustment board to make the wiring lengths pseudo-equivalent, thereby easily creating equal-length whiskers without affecting the wiring other than the target net. This has the effect of shortening the total wiring length of printed circuit board wiring.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a printed wiring board equipped with a delay value adjustment board (delay module) according to the present invention, FIG. 2 is a diagram showing a delay value adjustment board (delay module), and FIG. FIG. 4 is a diagram showing printed circuit board wiring according to the conventional wiring method. DESCRIPTION OF SYMBOLS 1... Printed wiring board, 2... Board for delay value adjustment, 3... Wiring for delay value adjustment, 4... Equal length whisker line net, 5... Net not subject to equal length whisker lines , 6...
Through hole, 7...Through hole for mounting the delay module.

Claims (1)

[Claims] What is claimed is: 1. A printed wiring board that connects mounted components with each other, and is equipped with a delay value adjustment board that adjusts the propagation time of a signal as a relay for a wiring pattern with the printed wiring board.