JP5555866B2 - Noise suppression parts - Google Patents

Description

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

  Conventionally, as a noise countermeasure technique used in an electronic device, a technique for mounting a noise countermeasure component such as a ferrite core on a lead included in the electronic component is known. In addition, as a technique for fixing this type of noise countermeasure component to the lead, a conical guide tube is press-fitted into the through hole of the ferrite core, and the guide tube is pressed against the lead and the ferrite core. A technique for fixing the lead and the core has been proposed (see, for example, Patent Document 1).

Japanese Utility Model Publication 4-111710

  By the way, the noise countermeasure parts as described above may be attached to the leads of power transistors and film capacitors used on the power supply substrate. In that case, the noise countermeasure component is inserted into the lead, and then the lead is inserted into the power supply board to be soldered.

  However, when such a soldering operation is performed, if the noise countermeasure component is not fixed to the lead, the noise countermeasure component easily falls off the lead. Therefore, it is necessary to carefully insert the leads into the power supply board while paying attention to the removal of noise suppression components, and even if such careful work is performed, the noise suppression components may be dropped. However, there was a problem that workability deteriorated.

  Moreover, if the technique described in Patent Document 1 is used, the noise countermeasure component can be fixed to the lead, but the noise countermeasure component mounted on the lead of the power transistor or the film capacitor is about several mm in outer shape. It is a very small part. For this reason, it is extremely difficult to press-fit a small conical guide tube into such a small part or to pass a lead through such a small conical guide tube. There was a problem of being bad.

  In addition, the power supply board as described above may transmit vibration or impact, so to prevent noise generation and damage, use a silicone adhesive to fix the noise countermeasure component to the power supply board. Measures may be taken. However, since the silicone-based adhesive is relatively expensive, there is a problem that the cost of raw materials is increased, and the work cost is increased by the amount of fixing work with the adhesive.

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

Hereinafter, the configuration employed in the present invention will be described.
The noise countermeasure component of the present invention is attached to the magnetic body having a through-hole and the magnetic body, and is elastically deformed when the lead of the electronic component is introduced into the through-hole to press-contact the lead. An elastomer part capable of suppressing the magnetic body from sliding down due to its own weight along the lead, and the elastomer part is introduced into the position where the lead penetrates through the through hole of the magnetic body A portion that has a path and forms the introduction path has a taper that narrows the introduction path from at least an opening at one end of the introduction path toward a position closer to the other end of the introduction path than the opening. is and, moreover, the raw material composition for forming the elastomeric portion, said by the magnetic body is molded in a deployed mold, and wherein the elastomeric portion is formed, prior to As the mold, a convex part for forming the introduction path is provided, and the mold in which a tapered surface for attaching the taper to the introduction path is formed in the convex part is used. When arranging the magnetic body in the mold, the magnetic body is brought into contact with the tapered surface at the boundary between the end surface and the inner peripheral surface of the magnetic body to support the magnetic body in the mold. Then, by molding the raw material composition in that state, the magnetic body has a structure arranged inside the elastomer part, and the portion formed by the elastomer material at the tapered portion Has a structure in which there is no gap between the magnetic body and the magnetic body.

  In the noise countermeasure component configured as described above, when the lead of the electronic component is introduced into the through hole of the magnetic body included in the noise countermeasure component, the elastomer portion is elastically deformed and press-contacted with the lead. And when it will be in this state, an elastomer part will suppress that a magnetic body slides with dead weight along a lead | read | reed.

  Therefore, according to such a noise suppression component, the noise suppression component falls off the lead without being excessively cautious when the lead is inserted into a printed wiring board or the like after being mounted on the lead. Therefore, good workability can be ensured.

  In addition, this noise countermeasure part has a structure including a magnetic body and an elastomer part, and does not press-fit a small part separate from the magnetic body into the through hole of the magnetic body. There is no need to handle small separate parts.

  Furthermore, even if vibration is transmitted to the printed wiring board to which the lead is attached or an impact is applied, the presence of the elastomer portion can absorb or mitigate the vibration or impact. Therefore, it is not necessary to fix the noise countermeasure component to the power supply substrate using a silicone-based adhesive or the like, and it is possible to reduce the raw material cost and the work cost required for the fixing work with the adhesive.

Further, in the noise suppression components of this, the elastomeric portion is in a position to pass through the through hole, that have a introduction path which the lead is introduced.

Therefore , the lead can be introduced at a position penetrating through the through hole of the magnetic body only by introducing the lead along the introduction path formed in the elastomer portion. Therefore, the lead can be easily arranged at an appropriate position as compared with the case where the introduction path penetrating the through hole is not formed.

  In addition, as the above introduction path is not formed, a bottomed recess is formed in the elastomer part, and when the lead is pierced into the bottom of the recess, the lead penetrates the bottom of the recess, It can be considered that a lead can be introduced at a position penetrating through the through hole of the magnetic body.

Further , in the elastomer portion, a portion that forms the introduction path has a taper that narrows the introduction path from at least an opening at one end of the introduction path toward a position closer to the other end of the introduction path than the opening. It is that not attached.

Therefore, since at least one end of the introduction path is tapered as described above, the lead can be smoothly introduced into the introduction path using this tapered portion.

  In addition, such a taper part may be provided only at one end of the introduction path, but may be provided at both ends of the introduction path. However, it is possible to make the dimension in the depth direction of the tapered portion longer when it is provided only at one end of the introduction path than when it is provided at both ends of the introduction path.

  Therefore, when the noise countermeasure component is relatively small, if it is desired to form a tapered portion with a sharper tip, it is preferable to ensure the depth dimension of the tapered portion by providing the tapered portion only at one end of the introduction path. .

  On the other hand, if tapered portions are provided at both ends of the introduction path, leads can be easily introduced from either end of the introduction path. Therefore, when importance is attached to such a function, it is preferable to provide tapered portions at both ends of the introduction path.

Further, in the noise suppression components described above, the elastomeric part, we are enclosing the magnetic material. Therefore , even if a crack or chip occurs in the magnetic material, the chip is held inside the elastomer portion. Therefore, the pieces of the magnetic material are not scattered in the electronic device, and it is possible to prevent the secondary pieces from being caused due to the scattered pieces.
In addition, it is preferable that the noise countermeasure component as described above further includes the following configuration.
First , in the elastomer part included in the noise countermeasure component described above, a plurality of convex portions projecting toward the center of the introduction path are formed in a portion forming the introduction path, and a tip of the convex part is It is preferable that the portion is in pressure contact with the lead.

  According to the noise countermeasure component configured in this way, the convex portion provided in the portion forming the introduction path presses against the lead at the tip thereof, so that the entire inner peripheral surface forming the introduction path is pressed against the lead. In comparison, the portion pressed against the lead is likely to be deformed. Therefore, for example, even if the lead diameter changes, the convex portion deforms following the diameter, so that it is possible to introduce from a thinner lead to a thicker lead.

Further, in the noise suppression components described above, the convex portion, out of the range extending between the ends of the introduction path and is formed in a position biased to near the other end than the one end Is preferred .

  In the noise countermeasure component configured in this way, when the magnetic material is cracked inside the elastomer part, when the lead is introduced into the introduction path, only the amount of the convex portion exists between the lead and the magnetic material. The other end portion of the introduction path is pushed outward from the one end portion. Therefore, in terms of appearance, it can be determined whether or not the magnetic body is cracked inside the elastomer portion based on whether or not the other end portion of the introduction path is pushed outward from the one end portion.

Further, in the noise suppression components described above, the elastomeric part, when a state of pressure contact to said lead is elastically deformed and has a recess to deform in the form of reducing the volume are preferred.

  According to the noise countermeasure component configured as described above, when the elastomer portion is elastically deformed and is brought into pressure contact with the lead, the volume of the concave portion is deformed. Therefore, the elastomer portion can be flexibly deformed as compared with the case where the same concave portion is not provided.

(A) is a plan view of a noise countermeasure part, (b) is a front view of the noise countermeasure part, (c) is a right side view of the noise countermeasure part, (d) is a bottom view of the noise countermeasure part, and (e) is noise. AA line sectional view of countermeasure parts. (A) is a perspective view in which the upper surface side of the noise countermeasure component can be seen, (b) is a perspective view in which the lower surface side of the noise countermeasure component is visible, and (c) is a front view showing a usage state of the noise countermeasure component. (A)-(d) is explanatory drawing which shows the manufacturing process of noise countermeasure components. (A)-(d) is explanatory drawing which shows the modification of a noise countermeasure component.

Next, an 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 2B includes a magnetic body 3 formed in an annular shape and an elastomer portion that encloses the magnetic body 3. And 5. The magnetic body 3 is made of a magnetic material such as ferrite, and a through hole 7 is formed at the center thereof.

  In the following description, the description is continued with the through direction of the through hole 7 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 7 should always be directed in the vertical direction. That is, when the noise countermeasure component 1 is used, the through direction of the through hole 7 may be directed in any direction.

  The elastomer portion 5 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, and penetrates the substantially cylindrical portion from the upper end side to the lower end side. And a plurality of (three in this embodiment) recesses 13 formed on the lower end surface of the substantially cylindrical portion.

  The introduction path 11 penetrates through the through hole 7 of the magnetic body 3, and a plurality of (three in this embodiment) project toward the center of the introduction path 11 on the lower end side inner periphery of the introduction path 11. The convex portion 15 is formed. Each convex portion 15 is in a position sandwiched between the concave portion 13 and the center of the introduction path 11.

  Further, the inner periphery of the upper end side of the introduction path 11 has a taper with a taper that narrows the introduction path 11 from an opening at the upper end of the introduction path 11 toward a position closer to the lower end of the introduction path 11 than the opening. A portion 17 is formed.

  Note that a plurality (four in this embodiment) of convex portions 19 are also formed on the tapered portion 17. However, in the tapered portion 17, both the tip of the convex portion 19 and the portion between the convex portions 19 are provided. Tapered as described above.

  As shown in FIG. 2C, the noise countermeasure component 1 configured as described above is attached 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.

  When the noise countermeasure component 1 is attached to the lead 25, the lead 25 is introduced into the introduction path 11 provided in the noise countermeasure component 1. At this time, since the lead 25 is introduced from the tapered portion 17 side, the tip of the lead 25 can be smoothly guided into the introduction path 11 as compared with the case where the tapered portion 17 is not provided.

  Then, the lead 25 passes through the gaps between the tips of the plurality of convex portions 15 and reaches the state of penetrating the introduction path 11. At this time, the plurality of convex portions 15 are compressed and elastically deformed in the centrifugal direction by a force received from the lead 25 side, and are pressed against the lead 25 by an elastic restoring force generated along with the elastic deformation.

  At this time, the plurality of convex portions 15 are compressed toward the centrifugal direction, so that the size of the convex portions 15 is reduced in the compression direction, but can be expanded in the circumferential direction. Therefore, if such a convex portion 15 is provided, the amount of deformation in the centrifugal direction can be increased at the tip of the convex portion 15 as compared with a case where the outer peripheral surface of the lead 25 is press-contacted by a simple cylindrical inner peripheral surface. it can.

  Moreover, the plurality of recesses 13 are formed at positions opposite to the center of the introduction path 11 with the respective protrusions 15 interposed therebetween. Therefore, when the convex part 15 is strongly compressed toward the centrifugal direction, the concave part 13 is crushed in the direction in which the inner peripheral side approaches the outer peripheral side, thereby reducing the volume, and thereby the convex part 15 is directed toward the centrifugal direction. Easily elastically deformed. That is, the amount of deformation in the centrifugal direction at the tip of the convex portion 15 is increased by providing the concave portion 13 as described above.

  Accordingly, by providing the convex portion 15 and the concave portion 13 as described above, when introducing the lead 25 into a position surrounded by the tip of the convex portion 15, from the relatively small diameter lead 25 to the large diameter lead 25, Can be widely accepted.

  When the noise countermeasure component 1 is attached to the lead 25 as described above, the plurality of convex portions 15 are brought into pressure contact with the lead 25, so that the noise countermeasure component 1 may slide down by its own weight along the lead 25. No state. 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 dropping the noise countermeasure component 1 and perform the soldering operation. Workability at the time becomes good.

  In addition, when an electronic device 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 5, so that It is possible to prevent the body 3 from being cracked or chipped.

  Moreover, even if the magnetic body 3 is cracked or chipped, if the magnetic body 3 is included in the elastomer part 5, the pieces of the magnetic body 3 will not be scattered outside the elastomer part 5. 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 other electronic components.

  Furthermore, with such a noise countermeasure component 1, since the relative position of the magnetic body 3 and the lead 25 is less likely to vary, the noise signal attenuation characteristics are less likely to vary, and the noise countermeasure component 1 is attached. The noise countermeasure effect can be expressed stably.

  Next, an example of the manufacturing method of the noise countermeasure component 1 as described above will be described. However, this manufacturing method is merely an example, and the desired noise countermeasure component 1 may be manufactured by another manufacturing method.

  First, in the manufacturing method described below, as shown in FIG. 3A, the annular magnetic body 3 is installed on the convex portion 31 </ b> A provided on the lower mold 31. Since this convex part 31A is a part which forms the above-mentioned taper part 17, the part contact | abutted with the magnetic body 3 has a cone shape. Therefore, if the magnetic body 3 is installed on such a cone-shaped convex portion 31A, even if the dimensional tolerance of the magnetic body 3 is somewhat large, the magnetic body 3 can be relatively easily positioned at the center of the final product. Can be arranged.

  When the magnetic body 3 is installed, the space between the lower mold 31 and the upper mold 33 is closed as shown in FIG. The upper mold 33 is provided with a convex portion 33A in order to form the concave portion 13 described above. The convex portion 33A has a large inclination when the magnetic body 3 installed on the convex portion 31A is inclined. It contacts the magnetic body 3 and plays a role of correcting the inclination of the magnetic body 3.

  And as shown in FIG.3 (c), the raw material composition for forming the elastomer part 5 is inject | emitted in a metal mold | die (inside the internal space which the lower mold 31 and the upper mold 33 form). Thereafter, when a predetermined curing time has elapsed, as shown in FIG. 3D, the space between the lower mold 31 and the upper mold 33 is opened, and the noise countermeasure component 1 as the final product is taken out.

If the noise countermeasure component 1 is manufactured by the manufacturing method as described above, the noise countermeasure component 1 in a form in which the magnetic body 3 is included in the elastomer portion 5 can be manufactured.
As mentioned above, although embodiment of this invention was described, this invention is not limited to said specific one Embodiment, In addition, it can implement with a various form.

  For example, in the noise countermeasure component 1 illustrated in the above embodiment, the entire magnetic body 3 is included in the elastomer portion 5, but like the elastomer portion 53 provided in the noise countermeasure component 51 illustrated in FIG. A part of the magnetic body 3 may be exposed.

  In the case of such a noise countermeasure component 51, the effect of preventing the fragments from being scattered when the magnetic body 3 is broken is reduced, but the noise countermeasure component 51 can be mounted on the lead 25 so as not to slip off by its own weight. It exhibits the same performance as the noise countermeasure component 1.

  Moreover, in the noise countermeasure component 1 illustrated in the above embodiment, an example in which a part of the elastomer portion 5 has entered the inside of the through hole 7 of the magnetic body 3 has been shown, but the noise countermeasure illustrated in FIG. Like the elastomer part 63 provided in the component 61, the elastomer part 63 may not enter the inside of the through hole 7 of the magnetic body 3.

  Moreover, in the noise countermeasure component 1 illustrated in the above embodiment, the introduction path 11 penetrating the elastomer portion 5 is formed. However, like the elastomer portion 73 provided in the noise countermeasure component 71 illustrated in FIG. The introduction path 75 may not pass through the elastomer portion 73.

  Even in such a case, if a part of the elastomer part 73 is a thin part 73A formed thinly, when the lead 25 is introduced, the lead 25 breaks through the thin part 73A. It can be used in the same way as the countermeasure component 1.

  Furthermore, in the noise countermeasure component 1 exemplified in the above embodiment, the tapered portion 17 is formed at one end of the introduction path 11 penetrating the elastomer portion 5, but the noise countermeasure component 81 exemplified in FIG. As with the elastomer portion 83, tapered portions 87 </ b> A and 87 </ b> B may be provided at both ends of the introduction path 85.

  1, 51, 61, 71, 81 ... Noise countermeasure parts, 3 ... Magnetic body, 5, 53, 63, 73, 83 ... Elastomer part, 7 ... Through hole, 11, 75, 85 ... Introduction path, 13 ... Concave part, 15, 19 ... Convex part, 17, 87A, 87B ... Taper part, 21 ... Electronic component, 23 ... Printed wiring board, 25 .. Lead, 31 ... lower mold, 33 ... upper mold, 31A, 33A ... convex part, 73A ... thin part.

Claims (4)

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. With possible elastomer part,
The elastomer portion has an introduction path through which the lead is introduced at a position penetrating the inside of the through hole of the magnetic body, and a portion forming the introduction path has an opening at least at one end of the introduction path. To the position closer to the other end of the introduction path than the opening, a taper that narrows the introduction path is attached,
Moreover, a raw material composition for forming the elastomeric part, by the magnetic body is molded in a deployed mold, the provided elastomer portion is formed, as the mold, the introduction path The convex part for forming is formed, and the mold in which the taper surface for attaching the taper to the introduction path is formed in the convex part is used, and the magnetic body is placed in the mold. When arranging, the magnetic body is abutted against the tapered surface at the boundary between the end face and the inner peripheral surface of the magnetic body to support the magnetic body in the mold, and in this state, the raw material composition Is formed so that the magnetic body is arranged inside the elastomer portion, and at the tapered portion, the portion formed of the elastomer material is a gap between the magnetic body and the magnetic body. A structure that never exists Anti-noise component which is characterized in that it is. In the elastomer part, a plurality of convex portions projecting toward the center of the introduction path are formed in a portion forming the introduction path, and a tip of the convex portion is a portion in pressure contact with the lead. The noise countermeasure component according to claim 1 . The convex portion, the out of range extending across the introduction passage, according to claim 2, it is characterized in that is formed on either the than the one end portion to bias the close of the other end position Noise suppression parts. The elastomeric part, when a state of pressure contact to said lead is elastically deformed, according to any of claims 1 to claim 3, characterized by having a recess to deform the form in which reduced volume Noise suppression parts.

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