JPH0223696A - Formation of paired line pattern of printed board - Google Patents

Abstract

PURPOSE:To realize protection from external noises and control of noise emission by disconnecting a first paired line pattern through an interval, by exchanging positions of a signal line pattern and a ground line pattern mutually at a second paired line pattern and by connecting the both patterns respectively. CONSTITUTION:A first paired line pattern 10 which is formed on a first wiring surface 8 of a printed board 4 is disconnected through an interval L. Positions of a signal line pattern 5 and a ground line pattern 6 are exchanged mutually at a second paired line pattern 11 which is formed on a second wiring surface of the printed board with the interval L, and the both patterns are connected respectively. A current which has flown in the direction shown by the arrow C through the signal line pattern 5 flows in the direction shown by the arrow (d) through the signal line pattern 5 whose position is exchanged with that of the ground line pattern 6. A current which has flown in the direction shown by the arrow (e) through the ground line pattern 6 flows in the direction shown by the arrow (f) through the ground line pattern 6 whose position is exchanged with that of the signal pattern 5. Current flows in this way as if the direction reverses at every current-stop interval L. According to this constitution, it becomes possible to control effect of external noises and to reduce emission of noises to the outside.

Description

[Detailed Description of the Invention] [Summary] Regarding a method of forming a pair wire pattern on a printed board with noise countermeasures, the present invention protects the signal wires of the printed board pattern from external noise and suppresses noise radiation from the signal wires. A method for forming a pair line pattern consisting of a signal line pattern and a ground line pattern on a printed board, the method comprising: forming a pair line pattern formed on a first wiring surface of a printed board with a gap in the middle; The signal line pattern and the ground line pattern are connected by interchanging the positional relationship of the signal line pattern and the ground line pattern with a second pair line pattern formed on the second wiring surface of the printed board.

[Industrial application field]

The present invention relates to a method of forming a pattern of paired wires on a printed circuit board in which noise countermeasures are taken.

In recent years, with the digitalization of electronic devices, malfunctions due to the influence of noise have become a problem.

For this reason, it not only protects electronic devices from external noise, but also protects electronic devices from external noise.
Regulations have come to be imposed on the external emission of noise from electronic devices.

Countermeasures are also required for pattern wiring on printed circuit boards.

[Conventional technology]

For noise countermeasures, for example, in wiring using wire materials, it is common practice to use so-called twisted pair wires, which are a pair of wires that have been repaired.

As shown in the explanatory diagram of the pair wires shown in FIG. The area is affected by magnetic fields in the same direction as indicated by arrows a and b.

Here, when the signal line 1 and the ground line 2 are repaired as shown in the explanatory diagram of the repair line shown in Fig. 4, the currents flowing through the signal line 1 and the ground line 2 are equal in magnitude and opposite in direction. , arrow a, b
As shown in , the directions of the magnetic fields are alternately reversed and cancel each other out, and the influence of the magnetic field on point A is weakened.

Furthermore, even when receiving a magnetic field (noise) from the outside, the influence of the magnetic field is reduced.

As shown in the perspective view of FIG. 5, the pair wire pattern 7 is formed on the printed board 4 so that the ground wire 6 is as close as possible to the signal wire 5 and parallel to the signal wire 5 in consideration of noise countermeasures.

[Problem to be solved by the invention]

In a printed circuit board, the pair wire pattern has the problem that the signal line and the ground wire are only parallel, and the same phenomenon as that of the pair wire explained in FIG. 3 occurs, and the pattern is susceptible to noise.

The present invention aims at protecting signal lines of a printed board pattern from external noise and suppressing noise radiation from the signal lines.

[Means to solve the problem]

In order to achieve the above object, in the present invention, as shown in the perspective view of FIG. The signal line pattern 5 and the ground line pattern 6 are connected by interchanging the positional relationship with each other with a second pair line pattern 11 formed on the second wiring surface 9 of the printed circuit board 4 at the above-mentioned interval. be.

[Effect]

The current that has flowed through the signal line pattern on the first wiring surface flows through the interrupted interval while changing the positional relationship with the ground wire pattern on the second wiring surface.

On the other hand, the same applies to the current flowing in the opposite direction through the ground wire pattern.

For this reason, the current flows as if its direction is reversed at every interruption interval, and the directions of the magnetic fields alternate and cancel each other out, similar to twisted pair wires.

〔Example〕

1 and 2 show one embodiment of the present invention.

Identical parts are designated by the same reference numerals throughout the design.

As shown in the perspective view of FIG. 1, the method for forming a pair line pattern on a printed board according to the present invention is to A second wire pair pattern 11 is formed on the second wiring surface (the back side of the first wiring surface) of the printed board 4 (with the No. 8 m pattern 5 and the ground wire). The patterns 6 are connected by interchanging their positional relationship with each other.

The first and second pair wire patterns 10 and 11 provided on the first and second wiring surfaces 8 and 9 are connected to each other by, for example, through holes 12 or connection pins (not shown).

By forming the pattern in this way, for example, the first
The current flowing through the signal line pattern 5 on the wiring surface 8 in the direction of the arrow C flows through the signal line pattern 5 whose positional relationship is swapped with the ground wire pattern 6 on the second wiring surface 9 at the interrupted interval in the direction of the arrow d. flows like.

On the other hand, the current flowing in the direction of arrow e through the ground wire pattern 6 on the first wiring surface 8 flows through the ground wire pattern 6 whose positional relationship is swapped with the signal wire pattern 5 on the second wiring surface 9 at the interrupted interval. It flows like arrow f.

In this way, the current flows in such a way that the direction reverses at each interrupted interval, and like twisted pair wires, the direction of the magnetic field alternately reverses and cancels each other out, suppressing the influence of external noise and preventing it from flowing outside. reduce noise emissions.

FIG. 2 is a perspective view showing another embodiment, in which the second pair line pattern 11 is provided parallel to the first pair line pattern 10, and the same effect as in the case of FIG. 1 is obtained. .

〔Effect of the invention〕

As explained above, by applying the method for forming a pair line pattern of the present invention to a printed circuit, it has the same effect as a twisted pair line, and the influence of external noise on the current flowing through the signal line pattern is reduced. This has great industrial effects, such as reducing noise radiated to the outside from the same current.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a method for forming a pair line pattern on a printed board according to the present invention, FIG. 2 is another embodiment showing a method for forming a pair line pattern on a printed board according to the present invention, and FIG. 3 is a perspective view showing a method for forming a pair line pattern on a printed board according to the present invention. FIG. 4 is an explanatory diagram showing the state of the magnetic field of the darning wire, and FIG. 5 is a perspective view of a conventional printed board on which a paired wire pattern is formed. In the figure, 4 is a printed board, 5 is a signal line pattern, 6 is a ground line pattern, 7 is a pair line pattern, 8 is the first wiring surface, 9 is the second wiring surface, and 10 is the first pair A line pattern, 11 is a second pair line pattern, and 12 is a through hole.

Claims (1)

[Scope of Claims] A method for forming a pair line pattern consisting of a signal line pattern (5) and a ground line pattern (6) on a printed board (4), comprising: a first wiring surface of the printed board (4); (8) The first pair wire pattern (10) formed on the printed circuit board (4) is interrupted at an interval in the middle, and the said interval is connected to the second wiring surface (9) of the printed board (4).
A method for forming a pair line pattern on a printed circuit board, characterized in that a signal line pattern (5) and a ground line pattern (6) are connected by switching their positional relationship with each other with a second pair line pattern (11) formed in .