JPH05102691A - Signal discriminator - Google Patents

Abstract

PURPOSE:To obtain a signal discriminator which can uniformly provide signal/ noise discriminating effects of wires for constituting a cable. CONSTITUTION:A signal discriminator 1 discriminates a signal by inserting a cable 4 into an opening 3 of a magnetic core 2 to absorb noise flowing to wires 4a, 4b,... for constituting the cable. The sectional area of the core 2 of the discriminator 1 is varied or the width of the opening 3 is altered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal discriminator for discriminating between a signal flowing through a cable of information processing equipment and noise.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing a conventional signal discriminator for a flat cable, and FIG. 8 is a perspective view showing its usage. In the figure, 1 is a signal discriminator, 2 is a magnetic material core which constitutes this signal discriminator, and is a divided magnetic material core 2a, 2
It consists of b. Reference numeral 3 denotes an opening formed inside the magnetic core 2 (between the divided magnetic cores 2a and 2b), through which a cable (flat cable) 4 is inserted. Reference numeral 5 is a press-contact groove formed on both sides of the outer surface of the split magnetic cores 2a and 2b, and reference numeral 6 is a press-contact spring which is attached to the press-contact groove 5 and presses the split magnetic cores 2a and 2b.

In the above signal discriminator 1, the divided magnetic cores 2a and 2b are attached from both sides of the cable 4, and the pressure welding groove 5 is provided.
A pressure contact spring 6 is attached to the core and the divided magnetic cores 2a and 2b are pressed against each other to form the magnetic core 2. When noise flows in the cable 4 in this state, an annular magnetic path is formed in the magnetic core 2, the noise is absorbed by the magnetic core 2, and the signal is discriminated.

The signal discriminating effect in the signal discriminator 1 is proportional to AC / B, where A is the sectional area of the magnetic core 2, B is the average magnetic path length, and C is the physical property value of the magnetic core 2. ..
In this case, looking at each of the electric wires forming the cable 4, the signal discrimination effect varies depending on the position where each electric wire is arranged.

That is, since the electric wires 4a and 4b located at both ends of the cable 4 are located near the side wall 9 in addition to the upper wall 7 and the lower wall 8 of the magnetic core 2, the electric wire 4c located in the central portion is Also, the magnetic path length is shortened, resulting in a difference in noise attenuation amount as shown in FIG. Such a phenomenon occurs not only in the case of a flat cable but also in the case of a round cable when it is inserted a plurality of times or a plurality of times.

[0006]

Since the conventional signal discriminator is constructed as described above, there is a difference in the signal / noise discriminating effect depending on the position of the electric wire forming the cable inserted into the signal discriminator. There was a problem.

The present invention has been made to solve the above-mentioned problems, and a substantially uniform signal discriminating effect can be obtained regardless of the positions of the electric wires constituting the cable inserted into the signal discriminator. It is intended to provide a highly reliable signal discriminator.

[0008]

The present invention is the following signal discriminator. (1) In a signal discriminator including a magnetic core having an opening through which a cable is inserted, the width of the opening of the magnetic core is adjusted so that the signal / noise discrimination effect of each electric wire forming the cable is substantially uniform. The signal discriminator which changed. (2) In a signal discriminator including a magnetic core having an opening through which a cable is inserted, the cross-sectional area of the magnetic core is changed so that the signal / noise discrimination effect of each electric wire forming the cable is substantially uniform. Signal discriminator. (3) In a signal discriminator including a magnetic core having an opening through which a cable is inserted, the axial length of the magnetic core is set so that the signal / noise discrimination effect of each electric wire forming the cable is substantially uniform. Signal discriminator with varying height.

[0009]

In the signal discriminator according to claim 1 of the present invention,
Since the width of the opening of the magnetic core is changed, the distance between the electric wire arranged in the portion where the width of the opening is small and the magnetic core is small. Therefore, the magnetic path length formed by the magnetic flux and the leakage magnetic flux passing through the magnetic body in this portion is shortened. Therefore, by increasing the width of the opening near the side wall of the magnetic core and decreasing the width of the opening near the side wall,
The magnetic path lengths for the respective wires are made substantially uniform, the magnetic flux is made substantially uniform, and the signal / noise discrimination effect is made substantially uniform.

In the signal discriminator according to claim 2 of the present invention, since the cross-sectional area of the magnetic core is changed, the magnetic flux passing through a portion having a large cross-sectional area is increased and the signal / noise discrimination effect is increased. .. Therefore, if the cross-sectional area of the portion close to the side wall of the magnetic core is reduced and the cross-sectional area of the portion away from the side wall is increased, the magnetic flux to each electric wire becomes substantially uniform, and the signal / noise discrimination effect becomes substantially uniform.

In the signal discriminator according to the third aspect of the present invention, since the length of the magnetic core in the width direction changes, the cross-sectional area of the portion having the long width direction becomes large. Therefore,
Shorten the axial length of the part near the side wall of the magnetic core,
When the axial length of the portion distant from the side wall is increased, the cross-sectional area changes correspondingly, and the signal / noise discrimination effect becomes substantially uniform.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is a perspective view showing a signal discriminator according to an embodiment of the present invention, and FIG. 2 is a perspective view showing its usage state. In the figure, the same reference numerals as those in FIGS. 7 and 8 are the same. Or shows a considerable part. The signal discriminator 1 is formed in substantially the same manner as that of FIGS. 7 and 8, but the upper wall 7 and the lower wall 8 of the magnetic core 2 have a central portion protruding in an arc shape toward the opening 3 side, The thick-walled portion 11 is formed, whereby the opening 3 has a large width in the portion close to the side wall 9 and becomes smaller as the distance from the side wall 9 increases. Other configurations are similar to those in FIGS. 7 and 8.

As shown in FIG. 2, the signal discriminator 1 has the split magnetic material cores 2a and 2b attached from both sides of the cable 4 and the pressure contact springs 6 mounted in the pressure contact grooves 5 to form the split magnetic material. The cores 2a and 2b are pressed together to form the magnetic core 2. In this state, when noise flows through the electric wires 4a, 4b, ... Of the cable 4, an annular magnetic path is formed in the magnetic core 2, the noise is absorbed by the magnetic core 2, and signals are discriminated.

In the signal discriminator 1 described above, since the central portions of the upper wall 7 and the lower wall 8 of the magnetic core 2 project toward the opening 3 to form the thick portion 11, the width of the opening 3 is widened. And the cross-sectional area of the magnetic core 2 has changed. That is, the width of the opening 3 is large in the vicinity of the side wall 9 and small in the central portion, and the cross-sectional area of the magnetic core 2 is small on the side wall 9 side and large in the central portion.

Each of the electric wires 4a, 4b constituting the cable 4 ...
The signal / noise discrimination effect of is proportional to the cross-sectional area of the magnetic core 2 and inversely proportional to the magnetic path length. The magnetic path length of each electric wire becomes shorter as the distance between the electric wire and the magnetic core 2 becomes shorter. The magnetic paths of the electric wires 4a and 4b at both ends of the cable 4 pass through the upper wall 7 and the lower wall 8 and adjacent side walls, and the opposite side is formed by a leakage magnetic flux passing through a gap between other electric wires. On the other hand, the magnetic path of the electric wire 4c in the central portion is formed by the upper wall 7 and the lower wall 8 and the leakage magnetic flux on both sides.

Here, the magnetic path length represents the average distance of the magnetic flux forming the magnetic path, and generally represents the length of the central portion of the magnetic path. Therefore, when the width of the opening 3 is constant, The magnetic path length of the electric wires 4a and 4b near the side wall 9 is shorter than that of the electric wire 4c in the central portion. However, in the signal discriminator 1 of the embodiment, since the width of the opening 3 is small in the central portion, the electric wire 4c
The distance between the magnetic core 2 and the magnetic core 2 becomes smaller, the magnetic path length becomes shorter than in the case of FIGS. 7 and 8, and the signal / noise discrimination effect becomes large.

Further, in the signal discriminator 1 of this embodiment, since the cross-sectional area of the central portion of the magnetic core 2 is larger than that in the case of FIGS. 7 and 8, the signal / noise discrimination effect is large. Therefore, by changing the cross-sectional area of the magnetic core 2 and the width of the opening 3, the signal / noise discrimination effect of each of the electric wires 4a, 4b ... Can be averaged.

By changing the cross-sectional area of the magnetic core 2 and the width of the opening 3 as in the above embodiment, the signal / noise discrimination effect can be averaged efficiently, but only one of these can be achieved. May be changed. To change only the cross-sectional area, with the width of the opening 3 being constant,
The thick portion can be formed by changing the length in the width direction or by projecting it outward. In order to change only the width of the opening 3, it is possible to project the opening 3 with the same thickness.

Embodiment 2 FIG. 3 is a perspective view showing a signal discriminator according to another embodiment, and FIG.
[Fig. 3] is a perspective view showing its usage state. In the signal discriminator 1 of this embodiment, the magnetic core 2 is integrally formed,
Other configurations are the same as those in FIGS. 1 and 2. The signal discriminator 1 is used by inserting the cable 4 into the opening 3 and has substantially the same operation and effect as those in FIGS.

Embodiment 3 FIG. 5 is a perspective view showing a use state of a signal discriminator according to another embodiment. The signal discriminator 1 of this embodiment is mounted so that a cable 4 made of a round cable passes a plurality of times in an opening 3 of a magnetic core 2 formed in substantially the same manner as in FIG.

Even in the case of a round cable, the electric wire 4c located on the central side of the opening 3 has a longer magnetic path length than the electric wires 4a and 4b located on the side wall 9 side. By forming the thick portion 11 by projecting the wall 8 toward the opening 3 side, the cross-sectional area of the magnetic core 2 and the width of the opening 3 are changed, and the magnetic path length is changed. The noise discrimination effect can be made almost uniform.

Embodiment 4 FIG. 6 is a perspective view showing a signal discriminator according to still another embodiment. The signal discriminator 1 of this embodiment is similar to FIG.
The magnetic core 2 is composed of the divided magnetic cores 2a and 2b, but the widths of the upper wall 7 and the lower wall 8 become larger toward the central portion of the opening 3, and the wide portion 12 is formed at the central portion. There is. As a result, the length of the cable 4 in the axial direction becomes longer toward the central portion of the opening 3, and the cross-sectional area of the magnetic core 2 is larger at this portion. The upper wall 7 and the lower wall 8 have a uniform thickness and are pressed against each other by the pressing spring 6 as in FIGS. 1 and 2, but are not shown.

In the signal discriminator 1 described above, since the axial length of the central portion of the opening 3 is long, the cross-sectional area at this portion is large and the signal / noise discrimination effect is substantially uniform. Since the magnetic core 2 has a uniform wall thickness, it is easy to manufacture, and the change amount of the cross-sectional area can be made more accurate than that of the magnetic core 2 having a variable wall thickness.

[0025]

According to the present invention, since the cross-sectional area of the magnetic core or the width of the opening is changed, the signal / noise discrimination effect of each electric wire forming the cable can be made substantially uniform. Further, in the case where the length of the magnetic core in the axial direction is changed, the cross-sectional area of the magnetic core is changed by this, the signal / noise discrimination effect of each electric wire is substantially uniform, and the manufacturing is easy. It is possible to accurately change the cross-sectional area.

[Brief description of drawings]

FIG. 1 is a perspective view of a signal discriminator according to a first embodiment.

FIG. 2 is a perspective view showing a usage state of the signal discriminator of the first embodiment.

FIG. 3 is a perspective view of a signal discriminator according to a second embodiment.

FIG. 4 is a perspective view showing a usage state of the signal discriminator according to the second embodiment.

FIG. 5 is a perspective view showing a usage state of the signal discriminator according to the third embodiment.

FIG. 6 is a perspective view of a signal discriminator according to a fourth embodiment.

FIG. 7 is a perspective view of a conventional signal discriminator.

FIG. 8 is a perspective view showing a usage state of a conventional signal discriminator.

FIG. 9 is a relationship curve diagram between noise attenuation and frequency.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal discriminator 2 Magnetic core 2a, 2b Split magnetic core 3 Opening 4 Cable 4a, 4b ... Electric wire 5 Pressing groove 6 Pressing spring 7 Upper wall 8 Lower wall 9 Side wall 11 Thick part 12 Wide part

Claims (3)

[Claims] 1. A signal discriminator comprising a magnetic core having an opening through which a cable is inserted so that the signal / noise discrimination effect of each electric wire forming the cable is substantially uniform. A signal discriminator characterized in that the width of the signal is changed. 2. A signal discriminator comprising a magnetic core having an opening through which a cable is inserted, so that the cross-sectional area of the magnetic core is substantially equal to the signal / noise discrimination effect of each electric wire forming the cable. A signal discriminator characterized in that 3. A signal discriminator provided with a magnetic core having an opening through which a cable is inserted so that the signal / noise discrimination effect of each electric wire forming the cable is substantially uniform. A signal discriminator characterized in that the length of the signal is changed.