JP2001135525A - Noise measure component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise measure component which can be provided without increasing components to be packaged on a substrate, namely, without enlarging the substrate and is capable of providing high noise removing operation in a high frequency area. SOLUTION: This component is composed of an insulated housing 1 molded from a resin 3 with mixed magnetic powder and at least one conductor 4 embedded in this housing 1. Both the terminals of the conductor 4 are vertically protruded from the housing 1 and this protruding part is made into connecting part 4a to dig into a signal line, which is embedded in a flexible cable 2 or flat cable, for connection. Between the connecting parts 4a and 4a at both the terminals of the conductor 4, a sharp cutting part 3a for cutting a signal line 6 is formed integrally with the housing 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise suppression component used in electronic equipment, and more particularly to a component connected to a signal line embedded in a flexible cable or a flat cable to remove noise.

[0002]

2. Description of the Related Art With the digitization and higher frequency of electronic equipment, noise radiated from the electronic equipment and malfunction of the electronic equipment due to the noise have become problems. Conventionally, in order to remove noise mixed in a signal in a cable or the like, an impedance element or a low-pass filter for removing noise is mounted on a substrate as shown in, for example, Japanese Patent Application Laid-Open No. 56-107480. .

[0003]

However, when these noise suppression components are mounted on a board, it is necessary to enlarge the board by an amount corresponding to the mounting of the noise suppression components. Further, in the case of a flexible cable or the like in which a large number of signals or the like are flowing at the same time, noise countermeasures are required in an amount corresponding to the number of the signal lines, resulting in an increase in cost.
There is also a type that winds a ferrite core around these flexible cables and raises the magnetic permeability around the line to remove noise, but with this method, a single ferrite core can handle many lines Although the number of components can be reduced, the air permeability is interposed between the signal line and the ferrite core, so that the effective magnetic permeability is significantly lower than the magnetic permeability of the ferrite core. Therefore, it is difficult to obtain a sufficient noise removing effect.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a noise countermeasure component which can be realized without increasing the number of components mounted on a substrate, that is, without enlarging the substrate, and which can obtain a high noise removing effect in a high frequency region. The purpose is to:

[0005]

According to a first aspect of the present invention, there is provided a noise suppression component comprising: an insulating housing formed of a resin mixed with magnetic powder; and one or more conductors embedded in the housing. Of the conductor are vertically projected from the housing, and the projection is cut into the signal line embedded in the flexible cable or the flat cable to form a connection portion for connection, and the signal line is cut between the connection portions at both ends of the conductor. And a sharp cut portion formed integrally with the housing.

In the noise countermeasure component according to the first aspect, the connection portion at both ends of the conductor is connected to a signal line such as a flexible cable, and the signal line is cut at a cut portion provided in the housing. A signal line is inserted into a conductor embedded in the housing. When a signal passes through a conductor embedded in the housing, noise in a high frequency region can be removed by the magnetic powder contained in the housing.

According to a second aspect of the present invention, the magnetic powder is made of Ni-Zn ferrite.
The magnetic powder is mixed with 50 wt% to 90 wt% of a resin to form a housing.

[0008] As described above, if the housing is formed of a resin molded article mixed with Ni-Zn ferrite powder, loss in a high frequency region can be increased and unnecessary high frequency noise can be removed. If the mixing ratio of ferrite is less than 50 wt%, the magnetic properties are significantly reduced.
Desired characteristics cannot be obtained. On the other hand, if the mixing ratio exceeds 90 wt%, the fluidity of the resin is remarkably deteriorated, and the dimensional accuracy at the time of insert molding is deteriorated, so that handling becomes difficult. In the case of Ni-Zn ferrite having a relative magnetic permeability of less than 100, desired characteristics cannot be obtained because the magnetic characteristics deteriorate. Further, Mn—Zn ferrite is not suitable for applications having a large number of signal lines because of a problem in insulating properties.

According to a third aspect of the present invention, there is provided a noise suppression component according to the first or second aspect, wherein the cut portion is formed in accordance with the connection portion.

As described above, by providing the cut portion provided on the housing in accordance with the connection portion, the cut portion is reinforced mutually, and bending and breakage thereof are prevented.

[0011]

FIG. 1 is a perspective view showing a noise suppression component 1 according to the present invention together with a flexible cable 2. The noise suppression component 1 of the present invention includes an insulating housing 3 formed of a resin mixed with magnetic powder, and one or more metallic conductors 4 embedded in the housing 3.
As the housing 3, it is preferable to use a hard general super engineering plastic such as polyphenylene sulfide (PPS). The housing 3 is made of a mixture of magnetic powder such as magnetic ferrite powder. The conductor 4 is made of a material having a higher hardness than copper, such as a copper alloy. A signal line 6 having a plate shape or the like arranged in a flexible resin 5 of the flexible cable 2 is embedded by injection molding or the like. The pitch W1 of the conductor 4 is set equal to the pitch W2 of the signal line 6 (W1 = W2).

In this embodiment, cut portions 3a are formed at both ends of the housing 3 in parallel in the same direction.
The cutting portion 3a has a sharp tip as shown in the sectional view of FIG. The connecting portion 4a is provided at both ends of the conductor 4 so as to overlap the outside of the cut portion 3a.
To form The cutting portion 3a and the connecting portion 4a are formed such that the tip shape of the cutting portion 3a and the connecting portion 4a forms a tapered shape.

As shown in FIG. 2A, when the conductor 4 is aligned with the signal line 6 of the flexible cable 2 and the noise suppression component 1 is pressed against the flexible cable 2, the connection portion 4a and the cut portion 3a cause At least the surface side of resin 5 of flexible cable 2 and signal line 6
Is cut off, whereby the signal line 6 is electrically disconnected by the cutting portion 3a, and the connection portion 4a is brought into contact with the signal line 6 to be electrically connected. As a result, a detour that returns from the signal line 6 to the signal line via the conductor 4 is formed. In order to prevent the noise suppression component 1 from coming off the flexible cable 2, it is more preferable that the noise suppression component 1 is fixed to the flexible cable 2 with an adhesive 7.

As described above, when the noise suppression component 1 is attached to the flexible cable 2, in the noise suppression component 1, the magnetic powder contained in the housing 3 increases the impedance in a high-frequency region. Unnecessary high frequency noise included is removed.

FIG. 3 shows that the housing 3 is manufactured by mixing a crushed powder of Ni—Zn ferrite having a relative magnetic permeability μ of about 700 in the above-mentioned PPS resin by about 70% by weight, and using a copper alloy as the conductor 4 by injection molding. , The frequency characteristic is shown when the relative magnetic permeability μ is 4.5. FIG. 3A shows a change in impedance, resistance, and reactance with respect to a change in the frequency of the signal line 6 between both ends of the flexible cable 2 with the noise suppression component 1 attached to the flexible cable 2. FIG. 3B shows impedance, resistance, and reactance with respect to a change in frequency at both ends of the signal line 6 when the noise suppression component 1 is not attached.

As can be seen from the comparison between FIGS. 3A and 3B, when the noise suppression component 1 is mounted on the flexible cable 2, the signal is transmitted through the conductor 4 embedded in the housing 3.
Therefore, a higher impedance can be obtained in a high frequency region than in the case where the noise suppression component 1 is not attached.

FIGS. 4A and 4B show Ni—Zn, respectively.
The real part μ ′ and the imaginary part μ ″ of the relative magnetic permeability due to the difference in the relative magnetic permeability μ of the ferrite magnetic powder are 1
This shows the case where 0, 100, and 1000 magnetic powders are used. In this case, the mixing ratio of the magnetic powder is 70
wt.%, and the PPS resin was used for the housing 3 of the noise suppression component 1. From FIG. 4, it is understood that the relative permeability is preferably 100 or more in order to obtain a high value in the imaginary part μ ″ having a large influence on the impedance in the high frequency region.

FIGS. 5A and 5B show that the mixing ratio of the magnetic powder of Ni—Zn having a relative magnetic permeability μ of 700 to the PPS resin is changed to 50, 65, and 80 wt%.
5 shows changes in the real part μ ′ and the imaginary part μ ″ of the relative magnetic permeability μ. As can be seen from FIG. 5, the real part μ ′ of the relative magnetic permeability decreases as the mixing ratio of the magnetic powder decreases. And the imaginary part μ ″ both decrease. The mixing ratio of magnetic powder is 50wt
%, The value of the real part μ ′ of relative permeability is μ ′ =
However, the mixing ratio of the magnetic powder is preferably 50 wt% or more to obtain desired characteristics. On the other hand, if the mixing ratio of the magnetic powder exceeds 90% by weight, the dimensional accuracy at the time of injection molding is deteriorated.

FIG. 2B shows another embodiment of the present invention, in which a cut portion 3b having a sharp end integrated with the housing 3 is provided at an intermediate portion of the housing 3. As shown in FIG. As described above, the cut portion 3b may be provided separately from the connection portion 4a of the conductor 4,
As shown in FIG. 1 and FIG. 2A, it is preferable to provide a connecting portion 4a so as to overlap with the cut portion 3a in order to prevent the connecting portion 4a from being bent or broken by reinforcing each other.

The noise suppression component of the present invention can be attached to a flat cable instead of the flexible cable 2.

[0021]

According to the first aspect of the present invention, the housing comprises an insulating housing formed of a resin mixed with magnetic powder, and one or more conductors embedded in the housing. A protruding portion is formed as a connecting portion that cuts into a signal line embedded in a flexible cable or a flat cable to be connected, and a sharp cutting portion for cutting the signal line is provided between the connecting portions at both ends of the conductor. Since it is formed integrally with the housing, a high noise removal effect can be obtained in a high frequency region without increasing the number of mounted components on the board, that is, without enlarging the board.

According to the second aspect, in the first aspect, the magnetic powder is made of Ni-Zn ferrite, and the magnetic powder is mixed with the resin at 50 wt% to 90 wt% to form the housing. , And unnecessary high frequency noise can be removed.

According to the third aspect, in the first or second aspect, since the cut portion is formed in accordance with the connection portion, the cut portion and the connection portion are mutually reinforced, and the connection portion and the cut portion are formed. Bending and breakage are prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a noise suppression component according to the present invention together with a flexible cable.

2A is a cross-sectional view showing the noise suppression component of FIG. 1 mounted on a flexible cable, and FIG. 2B is a cross-sectional view showing another embodiment of the noise suppression component of the present invention in a mounted state. is there.

3 (A) shows the frequency characteristics of impedance, resistance and reactance in the embodiment of FIGS. 1 and 2 (A), and FIG. 3 (B) shows the impedance of a signal line when no noise suppression component is attached. , Resistance, and reactance frequency characteristics.

FIGS. 4A and 4B show N and N respectively in the present invention.
The frequency characteristics of the real part μ ′ and the imaginary part μ ″ of the magnetic permeability due to the difference in the relative magnetic permeability μ of the magnetic powder made of i-Zn ferrite are shown for cases where the relative magnetic permeability μ is 10, 100, and 1000.

FIGS. 5A and 5B show Ni—Zn in the present invention.
The frequency characteristics of the real part μ ′ and the imaginary part μ ″ of the relative magnetic permeability μ when the housing is formed by changing the mixing ratio of the magnetic powder having a relative magnetic permeability of 700 to the PPS resin of 50, 65, and 80 wt%. It is shown.

[Explanation of symbols]

1: Noise suppression component 2: Flexible cable 3:
Housing, 3a, 3b: cut section, 4: conductor, 4a: connection section, 5: resin, 6: signal line, 7: adhesive

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H05K 9/00 H05K 9/00 LF term (reference) 5E070 AA05 AB01 AB10 BA17 BB03 CA07 DB06 DB10 EA06 5E321 BB21 BB33 BB53 CC02 CC16 GG05 GG07 GG09 5G311 CA01 CB01 CC01 CD05 CE06 CF06 5J020 BD02 EA02 EA10

Claims (3)

[Claims] An insulative housing formed of a resin mixed with magnetic powder, and one or more conductors embedded in the housing, wherein both ends of the conductor protrude vertically from the housing and the protruding portion is formed. A connecting portion that cuts into and connects to a signal line embedded in a flexible cable or a flat cable, and a sharp cutting portion for cutting the signal line is formed integrally with the housing between connecting portions at both ends of the conductor. A noise suppression component characterized by the following. 2. The noise suppression component according to claim 1, wherein the magnetic powder is made of Ni—Zn ferrite, and the magnetic powder is mixed with a resin in an amount of 50 wt% to 90 wt% to form a housing. 3. The component according to claim 1, wherein the cut portion is formed in accordance with the connection portion.