JP2013110168A - Noise countermeasure component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide, in a mounting of a ferrite core on a lead, improvement of insertion property with respect to a substrate, prevention of a crack and a chip of a ferrite as well as prevention of an occurrence of abnormal sound without using adhesive after fixation to a substrate, and prevention of dusts from attaching on the lead.SOLUTION: A size of an opening 6a of a support portion 6 in a noise countermeasure component 1 is set relatively smaller than a size of a cross section of a lead. Thus, the support portion 6 and the lead are tightly contacted just when the lead is inserted, and therefore a crack and a chip of a magnetic body 3 and an occurrence of abnormal sound can be prevented without using adhesive, and dust cannot invade into an introduction path 5, thereby reducing a risk of fire.

Description

  The present invention relates to a noise countermeasure component with improved dust resistance attached to a lead included in an electronic component.

2. Description of the Related Art Conventionally, as a noise countermeasure technique used in an electronic device, a technique of attaching a magnetic material such as a ferrite core to a lead included in an electronic component is known. In that case, when the magnetic body is inserted into the lead and then the power transistor or the like is inserted into the substrate and fixed by soldering, the magnetic body is easily removed from the power transistor, and the workability is very poor.
Furthermore, even after the power transistor or the like is inserted into the substrate and soldered, the vibration and impact are applied to the power supply substrate, so that the magnetic material is cracked or chipped, and the desired noise countermeasure effect cannot be obtained. .
By taking measures to fix the magnetic material to the substrate with a silicone-based adhesive or the like for such a problem, the magnetic material is prevented from cracking (see, for example, Patent Document 1).

In addition, there is a conventional technology for noise suppression that inserts a magnetic material into an elastomer. When an electronic component is assembled on a circuit board, the elasticity of the elastomer prevents the magnetic material from falling off the lead, and the electronic component is assembled. Workability can be improved (for example, refer patent document 2).
Further, a guide layer having a diameter smaller than the width of the coated lead on the inner peripheral surface of the insertion hole is formed by forming a coating layer made of silicone on the surface of the bead core (magnetic material) made of ferrite and having elasticity and insulation. The bead core formed with can prevent the dropping and enhance the workability of assembling the electronic component (see, for example, Patent Document 3).

Japanese Patent Application Laid-Open No. 61-042905 Japanese Patent Application No. 2010-249862 JP 2001-313215 A

  However, when taking measures to fix the magnetic body to the power supply substrate using a silicone adhesive or the like using the technique described in Patent Document 1, the silicone adhesive is relatively expensive, There was a problem that the raw material cost was high and the work cost was also increased by the amount of fixing work with the adhesive.

  Further, when the noise countermeasure component as described in Patent Document 2 is fixed to the lead, the noise countermeasure component attached to the lead of the power transistor or the film capacitor is fixed well, but the lead portion of the lead component is not fixed. There is a problem that dust adheres, and it does not have the performance to block the dust. Therefore, when dust accumulates on the lead portion, there is a risk of ignition, and a structure is required to prevent the dust from adhering to the lead portion.

  Furthermore, when trying to fix the bead core as described in Patent Document 3 to the lead, since the guide diameter of the bead core is small with respect to the entire vertical direction, it is difficult to insert, and when the tear strength of the coating layer is exceeded. Since the coating layer is damaged, there is a problem that the lead must be carefully inserted into the guide, and the lead diameter is limited, resulting in poor versatility.

  The present invention has been made to solve the above-described problems, and its purpose is to be able to be easily attached to a lead included in an electronic component, and to prevent the lead from falling off after being fixed. It is to provide a noise countermeasure component that can be protected from dust and has excellent dust resistance.

The noise countermeasure component according to claim 1 of the present invention includes a magnetic body having a through hole,
It is attached to the magnetic body, and when the lead of the electronic component is introduced into the through hole, it is elastically deformed and pressed against the lead, thereby preventing the magnetic body from sliding along the lead due to its own weight. In noise countermeasure parts with a possible elastomer part,
The elastomer part has an introduction path through which the lead is introduced at a position penetrating through the through hole,
The part forming the introduction path is provided with at least one support portion on one end side of the introduction path.

Further, in the noise countermeasure component according to claim 2 of the present invention, the support portion is provided at both ends of the introduction path.
Furthermore, in the noise countermeasure component according to claim 3 of the present invention, in the portion forming the introduction path, the support portion closest to the side where the lead of the electronic component in the introduction path is introduced is not opened.
Furthermore, in the noise countermeasure component according to claim 4 of the present invention, an opening smaller than the cross-sectional size of the lead is formed in the support portion.
Furthermore, in the noise suppression component according to claim 5 of the present invention, when the cross section of the opening and the lead is a shape defined by a circle, an ellipse, a polygon, and a combination thereof, the diameter and length of the opening The longest dimension of the length of the shaft or diagonal and the combination thereof is smaller than the dimension of the cross section of the lead corresponding to the dimension position.
Furthermore, in the noise countermeasure component according to claim 6 of the present invention, the introduction path has an opening area set to 2.25π mm ² or less.
Furthermore, in the noise countermeasure component according to claim 7 of the present invention, the elastomer portion includes the magnetic body.
Furthermore, in the noise countermeasure component according to claim 8 of the present invention, the thickness of the thinnest portion of the support portion is 3 mm or less.

According to the noise countermeasure component of the present invention, the following effects can be expected.
(1) When attached to the lead, dust can be prevented from entering between the lead and the noise countermeasure component. Accordingly, it is possible to reduce a risk that the dust may ignite when energized to the lead.
(2) According to the noise countermeasure component of the present invention, the lead can be easily introduced with a small force by making the support portion of the product relatively thin with respect to the lead introduction direction. For this reason, since it becomes difficult to exceed the tear strength of the elastomer material, the elastomer material is hardly damaged.
(3) According to the noise suppression component of the present invention, when the lead is introduced, the support portion reliably contacts the lead. Therefore, when the electronic component is inserted into the substrate, the noise suppression component does not fall and it is easy to work. Moreover, the adhesive normally used in order to prevent the cracking of a magnetic body becomes unnecessary, and the work of adhesive cost reduction and adhesive application itself becomes unnecessary.
(4) According to the noise countermeasure component of the present invention, when the electronic component is attached to the substrate and then used, even if the vibration or impact is transmitted to the printed wiring board, the vibration or impact transmitted to the magnetic body is the elastomer part. Therefore, it is possible to suppress the occurrence of cracking or chipping in the magnetic body.
(5) According to the noise countermeasure component of the present invention, even if the magnetic body is cracked or chipped, if the magnetic body is included in the elastomer portion, the magnetic piece is moved outside the elastomer portion. It will not be scattered. Therefore, even if the magnetic body is cracked or chipped, it is possible to prevent the magnetic piece from adversely affecting other electronic components.
(6) According to the noise countermeasure component of the present invention, the product can be mounted in parallel to the lead by providing two or more support portions for the product in the lead introduction (insertion) direction. . Therefore, the noise countermeasure effect of the magnetic material can be obtained stably.

(A) is a top view of the noise countermeasure component which concerns on the preferred Example of this invention, (b) is the bottom view, (c) is the front view, (d) is the AA sectional view. (A) is a perspective view showing the upper surface side of the noise countermeasure component according to the embodiment, (b) is a perspective view showing the lower surface side thereof, (c) is a perspective view showing the inside thereof, and (d) is equipped with the noise countermeasure component. Sectional drawing which soldered the electronic component to the printed wiring board. (A)-(c) is explanatory drawing which shows the process of mounting | wearing a noise countermeasure component with an electronic component. (A)-(b) is explanatory drawing which shows another Example of a noise countermeasure component. (A)-(b) is explanatory drawing which shows the modification of noise countermeasure components.

Next, a preferred embodiment of the present invention will be described with an example.
A noise countermeasure component 1 shown in FIGS. 1A to 1E and FIGS. 2A to 2C includes a magnetic body 3 formed in an annular shape and an elastomer portion 2 containing the magnetic body 3. ing. The magnetic body 3 is formed of a magnetic material such as ferrite, and a through hole 4 is formed at the center thereof.

  In the following description, the description is continued with the through direction of the through hole 4 being the vertical direction. However, the vertical direction defined here is defined for the sake of brevity in order to briefly explain the relative positional relationship between the respective parts of the noise countermeasure component 1. It does not mean that the through direction of 4 should always be directed vertically. That is, when the noise countermeasure component 1 is used, the through direction of the through hole 4 may be directed in any direction.

The elastomer part 2 is formed of an elastomer material having rubber elasticity such as a synthetic rubber or a thermoplastic elastomer, and is formed in a substantially cylindrical shape. An introduction path 5 that penetrates from the upper end side to the lower end side is formed in the central portion, and at least one support portion 6 (one in the upper end side in this embodiment) is provided in the introduction path 5. Is provided.
In addition, although the said support part 6 illustrates and demonstrates one place or two places for convenience of explanation, if the purpose of the present invention is satisfied, a plurality of support parts 6 may be provided inside the introduction path 5 of the noise countermeasure component. May be provided.

  The elastomer part 2 is not limited to an elastomer material having rubber elasticity such as synthetic rubber or thermoplastic elastomer, but acrylic rubber, nitrile rubber, isoprene rubber, urethane rubber, ethylene propylene rubber, chlorosulfonated polyethylene, epichlorohydrin rubber. Preferred are those selected from chloroprene rubber, silicone rubber, styrene-butadiene rubber, butadiene rubber, fluorine rubber, and polyisobutylene rubber. Among these, silicone rubber excellent in heat resistance, weather resistance, and chemical resistance is particularly suitable.

  As shown in FIG. 2D, the noise countermeasure component 1 configured as described above is connected to the lead 25 included in the electronic component 21 when the electronic component 21 (for example, a film capacitor) is mounted on the printed wiring board 23. Used by wearing.

  As shown in FIG. 3, when the noise countermeasure component 1 is attached to the lead 25, the lead 25 is introduced into the introduction path 5 provided in the noise countermeasure component 1 (see FIG. 3A). At this time, the tip of the lead 25 abuts on the support portion 6 in a state along the side wall of the introduction path 5. And the lead | read | reed 25 is inserted in the opening 6a provided in the approximate center part of the said support part 6 (refer FIG.3 (b)).

  Here, since the thickness of the support portion 6 in the opening 6a in the vertical direction is 3 mm or less and is relatively thin, when the lead 25 is inserted, the area in contact with the opening 6a can be small. Thereby, the tip of the lead 25 can be easily inserted into the opening 6a.

  And as shown in FIG.3 (c), the lead | read | reed 25 penetrates the support part 6 through the opening 6a, and reaches the state which penetrates the inside of the introduction path 5. As shown in FIG. At this time, since the support portion 6 is compressed and elastically deformed by the force received from the lead 25, the support portion 6 is brought into pressure contact with the lead 25 by an elastic restoring force which is a reaction force of the deformation. Become.

At this time, if the thickness in the vertical direction of the support portion 6 (at the opening 6a) exceeds 3 mm, the pressure contact force received from the support portion 6 when the lead 25 is inserted into the opening 6a increases, and the support portion 6 is It becomes difficult because a large force is required to penetrate. Further, when the lead 25 is inserted into the opening 6a in this state, a large force is applied to the magnetic body 3 as the elastic deformation generated in the support portion 6 increases, so that there is a risk of partial damage.
On the other hand, when the thickness of the support 6 in the opening 6a in the vertical direction is smaller than 0.001 mm, the area in contact with the lead 25 is reduced, and the elastic restoring force due to compression is weakened. The noise countermeasure component 1 may fall off the lead 25.

The support 6 has an opening 6a, and the size thereof is preferably smaller than the size of the cross section of the lead 25. By making the size of the opening 6a relatively smaller than the size of the cross section of the lead 25, the support portion and the lead 25 can be brought into close contact with each other at the same time as the lead 25 is inserted. This can reduce the risk of fire.
Here, the cross section of the lead 25 means an axial cross section of the lead 25.

Moreover, it is preferable that the opening area of the introduction path 5 is set to 2.25πmm ² or less (see FIG. 2A). When the opening area of the introduction path 5 is 2.25πmm ² or less, the lead 25 can be more easily introduced into the introduction path 5 more suitably. As a result, the distance between the lead 25 and the magnetic body 3 is less likely to be shifted by the individual noise countermeasure components 1, and as a result, the noise countermeasure effect of the magnetic body 3 is stably exhibited.
Here, the opening area of 2.25π mm ² is derived as follows. That is,
When the (axis) cross-sectional shape of the lead 25 is a circle, the lead 25 can be preferably introduced into the introduction path 5 when the diameter of the introduction path 5 is less than or equal to the diameter of the introduction path 5 (can be inserted into the opening 6a). ). However, if it is twice or more, wobbling easily occurs when the lead 25 is introduced into the introduction path 5, and it cannot be suitably inserted into the opening 6a.
-When the (axis) cross-sectional shape of the lead 25 is not a circle, the same result is obtained when the diameter of the introduction path 5 is less than twice the longest (maximum) dimension in the cross-sectional shape. It was.
The maximum size of the lead 25 that is generally used is 1.5 mm (the major axis of the ellipse).
Therefore, the lead 25 can be preferably introduced into the introduction path 5 having an opening area (1.5 mm × 1.5 mm × π (3.14)) whose diameter is twice or less of the dimension 1.5 mm.

  On the other hand, the lower limit of the opening area of the introduction path 5 is determined in relation to the support portion 6 (opening 6a). That is, at least the relationship between the lead 25 and the support portion 6 described above (in this embodiment, the size of the opening 6a is made smaller than the cross-sectional size of the lead 25) needs to be ensured.

  When the noise countermeasure component 1 is mounted on the lead 25 as described above, the support portion 6 is in pressure contact with the lead 25, so that the noise countermeasure component 1 does not slide down due to its own weight along the lead 25. It becomes. That is, the noise countermeasure component 1 can suppress the magnetic body 3 from sliding along the lead 25 due to its own weight.

Therefore, when soldering the lead 25 on which the noise countermeasure component 1 is mounted to the printed wiring board 23, it is not necessary to pay careful attention to the noise countermeasure component 1 being dropped, and the soldering operation is performed. Workability at the time becomes good.
Further, it is not necessary to fix the noise countermeasure component 1 to the lead 25 using an adhesive or the like.
Furthermore, when the electronic component 21 is used after such soldering, even if vibration or impact is transmitted to the printed wiring board 23, the vibration or impact transmitted to the magnetic body 3 is alleviated by the elastomer portion 2. It is possible to prevent the magnetic body 3 from being cracked or chipped.

Furthermore, when the noise countermeasure component 1 is attached to the lead 25, dust can be prevented from entering between the lead 25 and the introduction path 5, and thus the risk of ignition can be reduced. be able to.
Furthermore, since the support portion of the product is made relatively thin with respect to the insertion direction of the lead 25, the insertion can be easily performed, and it is difficult to exceed the elastic limit of the elastomer material. The magnetic body 3 is less likely to be damaged.
Moreover, even if the magnetic body 3 is cracked or chipped, if the magnetic body 3 is included in the elastomer part 2, the pieces of the magnetic body 3 will not be scattered outside the elastomer part 2. Therefore, even if the magnetic body 3 is cracked or chipped, it is possible to prevent the pieces of the magnetic body 3 from adversely affecting the electronic component.

  Next, an example different from the above example will be described. In addition, the part which overlaps with an Example is abbreviate | omitted and demonstrated.

In another embodiment, the support portion 6 has a structure not having the opening 6a. With the structure without the opening 6a, when the lead 25 is to be inserted into the support portion 6 (see FIG. 4A), the lead 25 breaks through the support portion 6 (substantially the central portion thereof). (See FIG. 4 (b)). Therefore, the lead 25 and the support portion 6 are brought into closer contact with each other due to the damaged end generated by the breakthrough. For this reason, the possibility that dust may enter between the lead 25 and the introduction path 5 is further lower than in the above-described embodiment, and the risk of ignition can be further reduced.
Further, although the pressure contact force that the lead 25 receives from the support portion 6 becomes stronger, the thickness of the thinnest portion of the support portion 6 in the vertical direction is preferably 3 mm or less, as in the above-described embodiment.

Next, a modified example related to the above-described embodiment and another embodiment will be described.
(1) For example, as shown in FIG. 5A, the support portion 6 can be provided on both ends of the introduction path 5. At this time, as shown in FIG. 5 (b), after the lead 25 has penetrated, the lead 25 is fixed by the support portions 6 and 6 at both ends. The posture of the lead 25 with respect to the magnetic body 3 can be made more stable. That is, even if a lot of work to mount the noise countermeasure component 1 on the electronic component 21 is performed, the fluctuation of the posture of the mounted noise countermeasure component 1 is reduced, and as a result, the noise countermeasure effect by the magnetic body 3 is stably expressed. Can do it.
In addition, since the elastic restoring force of compression will become large when two or more support parts 6 are provided, you may determine whether it fixes by one or multiple according to the diameter of the lead | read | reed 25. FIG.

(2) The noise countermeasure component of the present invention has a diameter, a major axis, or a diagonal line in the opening 6a when the cross section of the opening 6a and the lead has a shape defined by a circle, an ellipse, a polygon, and a combination thereof. It is preferable that the longest dimension among these lengths and combinations thereof is smaller than the dimension of the cross section of the lead corresponding to the dimension position.
With such a configuration, regardless of the cross-sectional shape of the lead 25, when the lead 25 is inserted into the support portion 6, both are brought into close contact with each other, so that dust does not enter the introduction path 5 and a risk of ignition. Can be reduced.

(3) The noise suppression component 1 according to the present invention only needs to be in a state where the support portion 6 is in pressure contact with the lead 25 when the lead 25 of the electronic component 21 is introduced into the introduction path 5. The elastomer portion may not include a magnetic material.
In this case, the manufacturing process of the noise countermeasure component 1 becomes simpler and the manufacturing cost can be reduced.

1 Noise countermeasure parts 2 Elastomer part 3 Magnetic body 4 Through hole
5 introduction path, 6 support part, 6a opening, 21 electronic component,
23 Printed circuit board, 25 leads

Claims (8)

A magnetic body having a through hole;
It is attached to the magnetic body, and when the lead of the electronic component is introduced into the through hole, it is elastically deformed and pressed against the lead, thereby preventing the magnetic body from sliding along the lead due to its own weight. In noise countermeasure parts with a possible elastomer part,
The elastomer part has an introduction path through which the lead is introduced at a position penetrating through the through hole,
A noise countermeasure component characterized in that at least one support portion is provided on one end side of the introduction path at a portion forming the introduction path.   The noise countermeasure component according to claim 1, wherein the support portion is provided on both ends of the introduction path.   3. The noise countermeasure component according to claim 1, wherein in the portion forming the introduction path, the support portion closest to the side where the lead of the electronic component in the introduction path is introduced is not opened.   The noise countermeasure component according to claim 1, wherein an opening smaller than a cross-sectional size of the lead is formed in the support portion.   When the cross section of the opening and the lead has a shape defined by a circle, an ellipse, a polygon, and a combination thereof, the longest dimension among the diameter, the length of the major axis or the diagonal in the opening, and the combination thereof is The noise countermeasure component according to claim 4, wherein the noise countermeasure component is smaller than a cross-sectional dimension of the lead corresponding to the dimension position. 6. The noise countermeasure component according to claim 1, wherein an opening area of the introduction path is set to 2.25π mm ² or less.   The noise countermeasure component according to claim 1, wherein the elastomer part includes the magnetic body.   The thickness of the thinnest part in the said support part is 3 mm or less, The noise countermeasure component as described in any one of Claims 1-7 characterized by the above-mentioned.

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