JP4608474B2 - Composite magnetic member - Google Patents

Description

  The present invention relates to a composite magnetic member having a structure in which a plurality of layers including a magnetic layer are laminated, wherein the magnetic layer has a structure in which a plurality of magnetic pieces are arranged in a planar shape.

Conventionally, a member having a magnetic layer formed by arranging a plurality of magnetic small pieces in a planar shape has already been proposed (see, for example, Patent Document 1).
The magnetic sheet or the antenna device described in Patent Document 1 includes a magnetic layer in which a plurality of magnetic material pieces are arranged in a plane on a sheet base material. It is disclosed that it is possible to easily set the sheet bending, deflection amount, and the like (for example, Patent Document 1: Paragraph [0055]).
JP 2006-174223 A

However, in the technique described in Patent Document 1, the work of arranging a plurality of magnetic small pieces on a sheet base material is a very troublesome work.
Further, as the size of the magnetic piece becomes smaller, it tends to be difficult to align as designed when arranging a plurality of pieces of magnetic piece. That is, there is a tendency that it is difficult to accurately align the directions of the magnetic pieces, and it is also difficult to accurately align the intervals between adjacent magnetic pieces.

  For this reason, if the magnetic pieces are not aligned as designed, for example, a gap larger than the design may be formed between adjacent magnetic pieces, resulting in the continuity of the magnetic layer. May be lost, resulting in variations in magnetic characteristics, and the magnetic layer may not perform as expected.

  The present invention has been made in order to solve the above problems, and a first object of the present invention is to provide a conventional product in spite of having a magnetic layer formed by arranging a plurality of magnetic substance pieces in a planar shape. An object of the present invention is to provide a composite magnetic member that can be manufactured more easily. A second object of the present invention is to provide a composite magnetic member that can improve the arrangement accuracy of a plurality of magnetic small pieces as compared with the conventional product, and in particular, does not easily generate an excessive gap between adjacent magnetic small pieces. .

The characteristic configuration employed in the present invention will be described below.
The composite magnetic member of the present invention has a structure having a plurality of stacked layers, and at least a part of the plurality of layers is a first covering layer in which a magnetic layer formed of a magnetic material is flexible. And the second coating layer, wherein the magnetic layer has a structure in which a plurality of magnetic pieces are arranged, and the plurality of magnetic pieces Is formed by sandwiching a thin plate-like magnetic body having a groove formed on at least one of the front and back surfaces between the first coating layer and the second coating layer, and then splitting along the groove. and der Ri things, the thin plate unevenness formed on the fracture surface of the magnetic body when divided along the grooves, characterized that you match each other in the magnetic material pieces adjacent.

In the composite magnetic member of the present invention, the plurality of magnetic small pieces are formed by dividing a thin plate-like magnetic body along the groove. The method of forming the groove in the thin plate-like magnetic body is arbitrary, but for example, the groove can be formed in the thin plate-like magnetic body by a laser processing apparatus using a CO ₂ laser, a YAG laser, or the like. Or a groove | channel can also be formed with a single blade or a Thomson blade, and the protrusion for forming a groove | channel may be provided in the metal mold | die for forming a thin-plate-like magnetic body.

  Also, the timing for forming the groove is arbitrary. For example, if a thin plate-like ferrite sintered body is used as the thin plate-like magnetic body, the groove is formed in advance on the green sheet before firing the ferrite. It may be fired or grooves may be cut after firing the ferrite.

  The thin plate-like magnetic body in which the grooves are formed by the method as described above is sandwiched between the flexible first coating layer and the second coating layer. At this stage, it is not necessary to arrange the magnetic pieces individually and align them as designed, so that the sandwiching operation can be performed very easily.

  Further, after the thin plate-like magnetic body is sandwiched between the first coating layer and the second coating layer, the thin plate-like magnetic body is split along the groove, thereby forming a plurality of magnetic pieces. Although the method of dividing the thin plate-like magnetic body along the groove is arbitrary, as an example, a method of applying pressure with a member such as a roller can be used.

  The plurality of magnetic material pieces thus formed are sandwiched between the first coating layer and the second coating layer and are held in a state where they are not displaced relative to each other. As a result, the magnetic pieces are not dropped off or scattered.

  Therefore, the composite magnetic member according to the present invention is easier than the conventional product as described in Patent Document 1 despite having a magnetic layer formed by arranging a plurality of magnetic pieces in a planar shape. It becomes possible to manufacture, and the arrangement accuracy of the plurality of magnetic substance pieces can be improved as compared with the conventional product.

  In the composite magnetic member of the present invention, adjacent magnetic pieces are in contact with each other at a fracture surface that was originally continuous. Therefore, even when microscopic irregularities may be formed on the fracture surface when the thin plate-like magnetic body is divided along the groove, the adjacent magnetic small pieces are not uneven. It becomes a form that exactly matches each other.

  Therefore, there is almost no gap between adjacent magnetic pieces, or even if they are present, the gap is extremely narrow, and no excessive gap is generated between adjacent pieces of magnetic material, so that the magnetic layer is good. It will exhibit magnetic properties. Therefore, it can be used as an electromagnetic wave shielding body or an electromagnetic wave absorber similarly to a general ferrite sintered body, and can be used, for example, to suppress radiation noise from electronic components and various cables.

  Furthermore, since the magnetic layer can be bent together with the first coating layer and the second coating layer after the thin plate-like magnetic body is split along the groove, the entire composite magnetic member of the present invention has flexibility. It becomes. Therefore, the composite magnetic member can be bent or bent, and the composite magnetic member can be arranged along a curved surface or unevenness.

  Therefore, compared to a highly rigid magnetic member (for example, a ferrite sintered body), the degree of freedom in arranging is high, and if it is a composite magnetic member of the present invention, a portion where a highly rigid magnetic member can be disposed. Needless to say, it becomes possible to place the magnetic member having high rigidity at a place where it was difficult to arrange the magnetic member.

  In addition, in many cases, the thin plate-like magnetic body is likely to be cracked or chipped. However, in the present invention, since the thin plate-like magnetic body is divided in advance along the groove, the magnetic piece may be further cracked excessively. It becomes difficult to chip. Therefore, compared with a mere thin plate-like magnetic body, it has excellent impact resistance and durability.

By the way, in the composite magnetic member of the present invention, it is more preferable to have the following configuration.
First, in the composite magnetic member of the present invention, the magnetic material is preferably soft magnetic ferrite, and more preferably Ni—Zn ferrite, Mn—Zn ferrite, Ba ferrite, or Ferroc planar ferrite. There should be. Alternatively, a cobalt-based or iron-based amorphous alloy is also suitable for use as a magnetic material in the present invention.

If comprised in this way, a magnetic layer will exhibit the outstanding magnetic characteristic.
In the composite magnetic member of the present invention, the magnetic layer preferably has a thickness of 0.01 mm to 1 mm, and more preferably a thickness of 0.01 mm to 0.3 mm. .

If the magnetic layer is made thin to this extent, the composite magnetic member can be easily bent or bent.
In the composite magnetic member of the present invention, the groove formed in the thin plate magnetic body preferably has a depth of 5% to 95% of the thickness of the thin plate magnetic body, more desirably 33%. It is good to be -66%.

  If comprised in this way, it can prevent that a thin plate-shaped magnetic body will break in an unexpected part because a groove | channel is too shallow, and a groove | channel is too deep, and between a 1st coating layer and a 2nd coating layer. It is possible to prevent the thin plate-shaped magnetic body from being broken before the thin plate-shaped magnetic body is sandwiched.

  In the composite magnetic member of the present invention, the groove formed in the thin plate-like magnetic body preferably has a width of 0.001 mm to 1 mm, and more preferably 0.01 mm to 0.5 mm. Good.

  In the composite magnetic member of the present invention, the magnetic piece is preferably shaped and dimensioned within a range of 0.01 mm square to 5 mm square, desirably 0.5 mm square to 3 mm square. It is good to be the shape and dimension contained in.

If comprised in this way, since a magnetic small piece will become small enough, an extra crack and a chip | tip can be prevented and the softness | flexibility of a composite magnetic member will also become sufficient.
Furthermore, in the composite magnetic member of the present invention, the first coating layer and the second coating layer are basically layers for holding the magnetic layer and are made of a material that does not impair the function of the magnetic layer. If it is, the material is not limited.

  For example, the first coating layer and the second coating layer are made of PET (polyethylene terephthalate) sheet, PEN (polyethylene naphthalate) sheet, PPS (polyphenylene sulfide) sheet, PVC (polyvinyl chloride) sheet, urethane sheet, polyimide sheet. Etc. can be configured. In these cases, the thickness of the first coating layer and the second coating layer is preferably about 0.005 mm to 0.5 mm, and more preferably about 0.01 mm to 0.3 mm.

In addition, at least one of the first coating layer and the second coating layer may have some function other than the function of holding the magnetic layer.
Specifically, for example, in the composite magnetic member of the present invention, at least one of the first coating layer and the second coating layer may be an adhesive layer formed of an adhesive material.

If comprised in this way, a composite magnetic member can be fixed with respect to a to-be-adhered body using an adhesion layer.
In the composite magnetic member of the present invention, at least one of the first coating layer and the second coating layer may be a conductive layer formed of a conductive material.

If comprised in this way, since an electroconductive layer functions as an electromagnetic wave shield layer, the effect which suppresses radiation noise can further be improved according to a synergistic effect with a magnetic layer.
In the composite magnetic member of the present invention, at least one of the first coating layer and the second coating layer may be a heat conductive layer formed of a heat conductive material.

If comprised in this way, heat can be released from the heat-source side to the thermal radiation part side using a heat conductive layer.
In the above, the configuration in which at least one of the first coating layer and the second coating layer has some function other than the function of holding the magnetic layer has been described. However, the composite magnetic member of the present invention includes the magnetic layer, the first layer, and the first layer. In addition to the three layers of the coating layer and the second coating layer, a structure in which several layers are further laminated may be employed. Therefore, for example, in addition to the magnetic layer, the first coating layer, the second coating layer, and the above three layers, some adhesive layers, conductive layers, heat conductive layers, and the like may be stacked.

Next, embodiments of the present invention will be described with specific examples.
[First Embodiment]
FIG. 1A is a perspective view of a composite magnetic member exemplified as an embodiment of the present invention, and FIG. 1B is an exploded view showing the structure of the composite magnetic member.

The composite magnetic member 1 has a structure in which a flexible first covering layer 3, a magnetic layer 5 formed of a magnetic material, and a flexible second covering layer 7 are laminated in this order. Yes.
Among these, the 1st coating layer 3 and the 2nd coating layer 7 are comprised by the resin sheet (In this embodiment, the PET sheet of thickness 0.1mm).

  In the case of the present embodiment, the magnetic layer 5 is composed of a sintered body of soft magnetic ferrite (for example, Ni—Zn-based ferrite), and has a structure in which a plurality of magnetic body pieces 5a are arranged vertically and horizontally. It has become.

  More specifically, each of the plurality of magnetic small pieces 5a has grooves 5c (see FIG. 2 (b)) formed in advance on one surface of the thin plate-like magnetic body 5b (see FIG. 2 (a)). The thin plate-like magnetic body 5b is sandwiched between the first coating layer 3 and the second coating layer 7 (see FIG. 2C) and then divided along the groove 5c (FIG. 2 ( d)).

  In the case of the present embodiment, a thin plate-like ferrite sintered body having a thickness of 0.2 mm is used as the thin plate-like magnetic body 5b, and one surface of the thin plate-like magnetic body 5b is formed with a width of 0. A groove 5c having a thickness of 1 mm and a depth of 0.1 mm (50% of the thickness of the thin plate-like magnetic body 5b) was formed.

  Then, a laminated body having a three-layer structure was obtained by laminating both surfaces of the thin plate-like magnetic body 5b in which the groove 5c was formed with a PET sheet to be the first coating layer 3 and the second coating layer 7. Note that the interface between the first coating layer 3 and the thin plate-like magnetic body 5b and the interface between the second coating layer 7 and the thin plate-like magnetic body 5b are in a state of being thermally fused.

Pressure was applied to such a laminated body with a roller (not shown) to divide the thin plate-like magnetic body 5b along the groove 5c, thereby forming a 1 mm square magnetic body piece 5a.
Since the composite magnetic member 1 having the above structure includes the magnetic layer 5 made of a magnetic material, the composite magnetic member 1 can be used as an electromagnetic wave shielding body or an electromagnetic wave absorbing body, like a general ferrite sintered body. It can be used for measures against radiation noise from parts and various cables.

  Further, unlike a general ferrite sintered body, the structure can be made extremely thin, so that the composite magnetic member 1 can be arranged even in a very narrow space that cannot be arranged with a conventional ferrite sintered body. become able to.

  Further, the composite magnetic member 1 has a structure in which the magnetic layer 5 in a state of being cracked along the groove 5c can be bent together with the first cover layer 3 and the second cover layer 7, so that the composite magnetic member 1 The whole has flexibility. Therefore, the composite magnetic member 1 can be bent or bent, and the composite magnetic member 1 can be arranged along a curved surface or unevenness.

  Therefore, the degree of freedom in arranging the composite magnetic member 1 is higher than that of a highly rigid ferrite sintered body, and from this point, it is difficult to arrange with the conventional ferrite sintered body. The composite magnetic member 1 can be arranged at the location.

  Further, in manufacturing the composite magnetic member 1, at the stage where the thin plate-like magnetic body 5 b is sandwiched between the first coating layer 3 and the second coating layer 7, a plurality of magnetic body pieces 5 a are individually arranged. Since the work of aligning as designed is not required, the pinching work can be performed very easily.

  Further, since the plurality of magnetic small pieces 5a are sandwiched between the first coating layer 3 and the second coating layer 7 and are held in a state in which they are not displaced relative to each other, the thin plate-like magnetic body 5b is The magnetic small pieces 5a are accurately arranged at the same position as before being divided along the groove 5c, and the magnetic small pieces 5a are not dropped or scattered.

  Therefore, this composite magnetic member 1 is easier than the conventional product as described in Patent Document 1 despite having the magnetic layer 5 in which a plurality of magnetic body pieces 5a are arranged in a plane. Thus, the arrangement accuracy of the plurality of magnetic substance pieces 5a can be improved as compared with the conventional product.

  In the composite magnetic member 1, as shown in FIG. 2 (d), the plurality of small magnetic pieces 5a are in contact with each other at the fracture surface 5d that was originally continuous. ing. Therefore, even if there are microscopic irregularities on the fracture surface 5d, the adjacent magnetic pieces 5a are in a form in which the irregularities exactly match each other.

  Therefore, there is almost no gap between the adjacent magnetic pieces 5a, or even if they are present, the gap is extremely narrow, and no excessive gap is generated between the adjacent pieces of magnetic material 5a. Exhibits good magnetic properties.

By the way, in the composite magnetic member as described above, various patterns can be considered as the groove pattern in forming the groove as described above in the thin plate-like magnetic body.
For example, in the case of the magnetic layer 5 described above, a plurality of grooves extending vertically and horizontally as shown in FIG. 3A form a lattice pattern, but the magnetic layer 11 shown in FIG. As described above, a plurality of grooves extending obliquely from the upper right to the lower left in the drawing may be formed in addition to the plurality of grooves extending vertically and horizontally.

  3C, in addition to a plurality of grooves extending vertically and horizontally, a plurality of grooves extending obliquely from the upper right to the lower left in the figure, and a plurality extending obliquely from the upper left to the lower right in the figure. A groove may be formed.

  Alternatively, as in the magnetic layer 15 shown in FIG. 3D, instead of a plurality of grooves extending vertically and horizontally, a plurality of grooves extending obliquely from the upper right to the lower left in the figure and extending obliquely from the upper left to the lower right in the figure. A plurality of grooves may be formed.

Because the composite magnetic member finally obtained varies depending on the difference in the groove pattern, it is preferable to select the groove pattern in consideration of the form in use.
Further, the groove patterns shown in FIGS. 3A to 3D are formed in parallel with ones extending in parallel, but like the magnetic layer 17 shown in FIG. Alternatively, a pattern in which the groove interval is changed may be adopted. By adopting such a groove pattern, the bendability of the finally obtained composite magnetic member can be partially changed.

Further, what is illustrated in FIG. 3 is a pattern in which a plurality of straight grooves extend in parallel, but the grooves may be grooves that draw a curve or grooves that draw a broken line.
[Second Embodiment]
Hereinafter, another embodiment different from the first embodiment will be described.

  The composite magnetic member 1 described in the first embodiment has a structure in which the first coating layer 3, the magnetic layer 5, and the second coating layer 7 are simply laminated as shown in FIG. In the composite magnetic member 21 shown in FIG. 4B, the magnetic layer 5 is sandwiched between the first coating layer 3 and the second coating layer 7 that are slightly larger in size than the magnetic layer 5, and the first coating layer is formed at the periphery thereof. 3 and the second coating layer 7 are directly heat-sealed.

In addition, the material of the 1st coating layer 3 and the 2nd coating layer 7 is the same as that of 1st Embodiment. The material, structure, processing method, and the like of the magnetic layer 5 are the same as in the first embodiment.
Even the composite magnetic member 21 adopting such a structure has the same operations and effects as those of the first embodiment. In addition, in the case of this composite magnetic member 21, the magnetic layer 5 is enclosed in the first coating layer 3 and the second coating layer 7, and the magnetic layer 5 is not exposed at the end face of the composite magnetic member 21, so that the magnetic layer 5 is magnetic. The layer 5 can be protected more reliably.

[Third Embodiment]
The composite magnetic member 23 shown in FIG. 4C has a structure in which an adhesive layer 25 is further laminated in addition to the first coating layer 3, the magnetic layer 5, and the second coating layer 7.

  In the case of this embodiment, the adhesive layer 25 is formed of an acrylic adhesive, but as the adhesive, any adhesive that is employed in various adhesive tapes and adhesive sheets can be arbitrarily employed. .

In addition, the material of the 1st coating layer 3 and the 2nd coating layer 7 is the same as that of 1st Embodiment etc. The material, structure, processing method, and the like of the magnetic layer 5 are the same as those in the first embodiment.
Even the composite magnetic member 23 employing such a structure exhibits the same operations and effects as those of the first embodiment and the like. Moreover, in the case of this composite magnetic member 23, the release paper 27 can be peeled off and the composite magnetic member 23 can be attached to an arbitrary location.

[Fourth Embodiment]
The composite magnetic member 31 shown in FIG. 4D has a structure in which the first covering layer 3, the magnetic layer 5, and the adhesive layer 25 are laminated. That is, in the third embodiment, the composite magnetic member 23 has a structure in which the adhesive layer 25 is provided separately from the first coating layer 3, the magnetic layer 5, and the second coating layer 7 (FIG. 4). In the present embodiment, the adhesive layer 25 is configured to function as the second coating layer referred to in the present invention.

The materials of the first covering layer 3 and the adhesive layer 25 are the same as those in the first embodiment. The material, structure, processing method, and the like of the magnetic layer 5 are the same as those in the first embodiment.
Even the composite magnetic member 31 employing such a structure exhibits the same operations and effects as those of the first embodiment and the like. In addition, the composite magnetic member 23 can also be peeled off the release paper 27 and attached to an arbitrary place as in the third embodiment.

  Note that the composite magnetic member 31 does not have the second coating layer 7 that is a resin sheet as compared to the composite magnetic member 23, and thus the mechanical strength may be somewhat reduced by that amount. If the mechanical strength of the entire composite magnetic member 31 is ensured by the layer 3, it can be used without any problem.

  Further, the composite magnetic member 31 has a lower bending rigidity than the composite magnetic member 23 because the second coating layer 7 that is a resin sheet is not present. You can do it. Therefore, for example, it is more convenient than the composite magnetic member 23 when pasting on a curved surface.

  Thus, depending on the application, the second coating layer may be composed of a material other than the resin sheet, and even in this case, the plurality of magnetic small pieces 5a are arranged in a planar shape by the procedure as described above. The magnetic layer 5 having the above structure can be formed.

[Fifth Embodiment]
The composite magnetic member group 33 shown in FIGS. 5A and 5B has a structure in which a single release paper 27 is provided for a plurality of composite magnetic members 33a. That is, in the said 4th Embodiment, although the single release paper 27 was provided with respect to the single composite magnetic member 31, 5th Embodiment differs from 4th Embodiment by this point. It has become a thing.

  Each of the composite magnetic members 33a has a structure in which the first covering layer 3, the magnetic layer 5, and the adhesive layer 25 are laminated. In this respect, the structure equivalent to the composite magnetic member 31 of the fourth embodiment is provided. It has become. The material and the like of the first covering layer 3 and the adhesive layer 25 are the same as those in the first embodiment, and the material, structure, processing method, and the like of the magnetic layer 5 are the same as those in the first embodiment.

  As shown in FIG. 5C, each composite magnetic member 33a has a size suitable for being attached to an electronic component 37 that is surface-mounted on the printed wiring board 35. By affixing to the component 37, it can be used for measures against radiation noise from the electronic component 37.

[Sixth Embodiment]
The composite magnetic member 41 shown in FIGS. 6A and 6B can be interposed between the electronic component and the printed wiring board. That is, in the said 5th Embodiment, although the thing of the type affixed on an electronic component was illustrated, 6th Embodiment differs from 5th Embodiment by this point.

  The composite magnetic member 41 has a structure in which a plurality of holes 43 are formed, and a solder joint provided in an electronic component can be soldered to a conductor pattern on a printed wiring board through the holes 43. ing.

  The composite magnetic member 41 has a structure in which the first covering layer 3, the magnetic layer 5, and the adhesive layer 25 are laminated, and this point has the same structure as the composite magnetic member 33a of the fifth embodiment. It has become. The material and the like of the first covering layer 3 and the adhesive layer 25 are the same as those in the first embodiment, and the material, structure, processing method, and the like of the magnetic layer 5 are the same as those in the first embodiment.

[Seventh Embodiment]
The composite magnetic member 45 shown in FIG. 7A has a structure in which the first covering layer 3, the magnetic layer 5, and the adhesive layer 25 are laminated, and thus the composite magnetic member 31 described above (FIG. 4D). The basic structure is the same as that of the above-mentioned)), but in addition to these, a band 47 and an adhesive portion 48 are further provided.

  As shown in FIG. 7B, the composite magnetic member 45 configured in this way winds the belt-shaped body 47 around the flat cable 51 (or FPC, etc .; the same applies hereinafter), and attaches the adhesive portion 48 to the belt-shaped body 47. By sticking on the outer peripheral side, it can be attached to the flat cable 51 and can be used for measures against radiation noise from the flat cable 51.

[Eighth Embodiment]
The composite magnetic member 53 shown in FIG. 8A has a structure in which the first covering layer 3, the magnetic layer 5, and the adhesive layer 25 are laminated, and includes a strip 47 and an adhesive portion 48. Although the structure is similar to the described composite magnetic member 45 (see FIG. 7A), the composite magnetic member 45 is a laminated body of the first covering layer 3, the magnetic layer 5, and the adhesive layer 25. In contrast, the composite magnetic member 53 is characterized in that it includes two sets of similar laminated bodies.

  As shown in FIG. 8B, the composite magnetic member 53 configured as described above is flattened by winding the belt-like body 47 around the flat cable 51 and attaching the adhesive portion 48 to the outer peripheral side of the belt-like body 47. It can be attached to the cable 51, and this is the same as the composite magnetic member 45. However, since two sets of laminated bodies of the first covering layer 3, the magnetic layer 5, and the adhesive layer 25 are provided, the composite magnetic member can be used in that the flat cable 51 can be sandwiched from both sides by these two sets of laminated bodies. It is different from 45.

  With such a composite magnetic member 53, the effect of radiating noise from the flat cable 51 to the flat cable 51 can be improved as compared with the composite magnetic member 45 described above.

[Ninth Embodiment]
The composite magnetic member 55 shown in FIG. 9A has a structure in which the first covering layer 3, the magnetic layer 5, and the adhesive layer 25 are laminated, and includes a band 47 and an adhesive portion 48. The structure is similar to the described composite magnetic member 45 (see FIG. 7A) and composite magnetic member 53 (see FIG. 8A), but the first covering layer 3, the magnetic layer 5, and the adhesive layer It is characterized by having 8 sets of 25 laminated bodies.

  The composite magnetic member 55 configured as described above can be attached to the outer periphery of the cable 57 in a form having an octagonal cross section as shown in FIG. 9B, and measures against radiation noise from the cable 57. Can be used.

[Tenth embodiment]
The composite magnetic member 55 shown in FIG. 9B is attached to the outer periphery of the cable 57 in such a form that the cross section is an octagon, but the first covering layer 3, the magnetic layer 5, and the adhesive layer 25 are laminated. When the body can be curved sufficiently, a single laminate of the first covering layer 3, the magnetic layer 5, and the adhesive layer 25 is used, as in the composite magnetic member 61 shown in FIG. As shown in FIG. 10B, the cable 63 may be attached to the outer periphery.

  Since the magnetic layer 5 bends between the plurality of magnetic pieces constituting the magnetic layer 5, the smaller the size of the magnetic pieces (that is, the greater the number of magnetic pieces per unit area), the more It can be smoothly curved.

[Eleventh embodiment]
A composite magnetic member 65 shown in FIG. 11A includes the first covering layer 3 and the magnetic layer 5 in the embodiments described above (for example, the composite magnetic member 31 (see FIG. 4D)). Etc.), but differs from the above-described embodiments in that a conductive layer 67 formed of a conductive material is provided as the second covering layer.

  As a conductive material for forming the conductive layer 67, for example, a material obtained by dispersing a conductive filler such as metal powder, metal plating powder, or carbon powder in a matrix resin can be used. Alternatively, the conductive layer 67 may be formed by applying a metal coating to the surface of the resin sheet by a method such as metal vapor deposition, sputtering, or ion plating. Alternatively, the conductive layer 67 may be composed of a metal foil such as aluminum foil or copper foil, or the conductive layer 67 may be composed of a metal-plated woven fabric or non-woven fabric.

  In the case of the composite magnetic member 65 having such a structure, as shown in FIG. 11A, the conductive layer 67 functions as an electromagnetic wave shielding layer. Therefore, it can be used for countermeasures against radiation noise from the conductor pattern 73.

  FIG. 11B and FIG. 11C are diagrams showing an example in which the composite magnetic member 65 is applied to the flat cable 51. Thus, even when the composite magnetic member 65 including the conductive layer 67 is attached to the flat cable 51, the conductive layer 67 functions as an electromagnetic wave shielding layer, so that radiation noise is effectively reduced by a synergistic effect with the magnetic layer 5. It can suppress and can utilize for the radiation noise countermeasure from the flat cable 51. FIG.

[Twelfth embodiment]
The composite magnetic member 75 shown in FIG. 12A has the same structure as that of each of the embodiments described above, except that the heat conductive layer 77 formed of a heat conductive material is first covered. It differs from each embodiment demonstrated previously by the point provided as a layer and a 2nd coating layer.

As a heat conductive material for forming the heat conductive layer 77, for example, a material obtained by dispersing a heat conductive filler such as alumina in a matrix resin is used.
In the case of the composite magnetic member 75 having such a structure, as shown in FIG. 12A, a heat source can be formed by sandwiching it between the electronic component 81 surface-mounted on the printed wiring board 79 and the radiation fin 83. Heat can be transmitted from a certain electronic component 81 to the heat radiation fin 83 that is a heat radiation portion, and heat radiation from the electronic component 81 can be promoted. At the same time, it can be used for countermeasures against radiation noise from the electronic component 81.

  Alternatively, as shown in FIG. 12B, the composite magnetic member 75 is sandwiched between an electronic component 81 surface-mounted on a printed wiring board 79 and a shield case 85, whereby an electronic component 81 that is a heat source. Therefore, heat can be transferred from the electronic component 81 to the shield case 85 that also functions as a heat radiating portion, and heat dissipation from the electronic component 81 can be promoted.

  Thus, depending on the application, both the first coating layer and the second coating layer may be composed of other than the resin sheet, and even in this case, a plurality of magnetic bodies can be obtained by the procedure as described above. The magnetic layer 5 having a structure in which the small pieces 5a are arranged in a planar shape can be formed.

[Thirteenth embodiment]
The basic structure of the composite magnetic member 91 shown in FIG. 13 is the same as that of the first embodiment. However, the shape of the outer peripheral portion 93 is cut into an arbitrary shape, and some holes are formed inside. 95 is formed.

  The shape of the outer peripheral portion 93 and the hole 95 is designed in accordance with the arrangement of the electronic components included in the electronic device to be arranged. For example, the convex portion can be escaped, used as a screw hole, It is for use as a mouth, or as a light transmission part or a monitoring window.

  In FIG. 13, the magnetic layer inside the composite magnetic member 91 is divided into a plurality of pieces of magnetic material at the position indicated by the dotted line in the figure, but the magnetic layer is the first as in the above-described embodiments. Since the structure is sandwiched between the coating layer and the second coating layer, even if the shape of the outer peripheral portion 93 is processed into an arbitrary shape, the magnetic piece on the outer peripheral portion 93 will not fall off. . For the same reason, even if the holes 95 having various shapes are provided, the magnetic pieces on the periphery of the holes 95 do not fall off.

[Fourteenth embodiment]
The composite magnetic member 101 shown in FIG. 14A and FIG. 14B is affixed to the RFID antenna substrate 103, and the first covering layer 3, the magnetic layer 5, and the adhesive layer 25 are laminated. This is the same structure as that of the fourth embodiment.

  If such a composite magnetic member 101 is affixed to the RFID antenna substrate 103, the influence of metal around the RFID antenna substrate 103 can be avoided when performing communication by RFID, thereby reducing the communication distance. Can be enlarged.

  A composite magnetic member 111 shown in FIG. 14C is a modified example in which a conductive layer 67 is employed instead of the first coating layer 3 provided in the composite magnetic member 101. Similar to the composite magnetic member 101, the composite magnetic member 111 is also used by being attached to the RFID antenna substrate 103.

  Even with such a composite magnetic member 111, the communication distance can be expanded while avoiding the influence of the metal around the RFID antenna substrate 103 when performing communication by RFID, as in the case of the composite magnetic member 101. In particular, the electromagnetic shielding effect can be improved by the conductive layer 67.

[Other Embodiments]
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 each of the embodiments described above, an example in which the magnetic layer 5 is made of Ni—Zn-based ferrite has been shown. However, the magnetic layer 5 may be formed of other magnetic materials, for example, Mn—Zn-based ferrite, The magnetic layer 5 may be composed of Ba-based ferrite or Ferro-planar ferrite.

  In the above embodiment, specific examples of the shape of the composite magnetic member, the thickness of the magnetic layer 5, the width and depth of the groove 5c formed in the thin plate-like magnetic body 5b, and the size and shape of the magnetic small piece 5a. However, these can be arbitrarily changed as long as the function as the composite magnetic member is not impaired.

  Further, in the above-described embodiment, the processing by the laser processing apparatus is illustrated in forming the groove 5c in the thin plate-like magnetic body 5b. However, the groove 5c may be formed by other methods. Specifically, the grooves may be formed with various cutting machines after the thin plate-like magnetic body 5b is fired, and the grooves are formed with a mold or some jig at the time of the green sheet before the thin plate-like magnetic body 5b is fired. It may be formed.

(A) is a perspective view of the composite magnetic member illustrated as 1st Embodiment, (b) is an exploded view which shows the structure of the composite magnetic member. Explanatory drawing which shows the formation procedure of a magnetic layer. Explanatory drawing which shows the pattern of a groove | channel. (A) is sectional drawing of the composite magnetic member illustrated as 1st Embodiment, (b) is sectional drawing of the composite magnetic member illustrated as 2nd Embodiment, (c) is the composite magnetic member illustrated as 3rd Embodiment. (D) is sectional drawing of the composite magnetic member illustrated as 4th Embodiment. (A) is sectional drawing of the composite magnetic member group illustrated as 5th Embodiment, (b) is a top view of the composite magnetic member group, (c) is the use condition of the composite magnetic member illustrated as 5th Embodiment. FIG. (A) is explanatory drawing which shows the use condition of the composite magnetic member illustrated as 6th Embodiment, (b) is a top view of the composite magnetic member. (A) is a perspective view of the composite magnetic member illustrated as 7th Embodiment, (b) is a perspective view which shows the use condition of the composite magnetic member. (A) is a perspective view of the composite magnetic member illustrated as 8th Embodiment, (b) is a perspective view which shows the use condition of the composite magnetic member. (A) is a perspective view of the composite magnetic member illustrated as 9th Embodiment, (b) is a perspective view which shows the use condition of the composite magnetic member. (A) is a perspective view of the composite magnetic member illustrated as 10th Embodiment, (b) is a perspective view which shows the use condition of the composite magnetic member. (A) is explanatory drawing which shows the use condition of the composite magnetic member illustrated as 11th Embodiment, (b) is a perspective view which shows another use condition of the composite magnetic member illustrated as 11th Embodiment, (c) is Explanatory drawing which shows another use condition of the composite magnetic member illustrated as 11th Embodiment. (A) is explanatory drawing which shows the use condition of the composite magnetic member illustrated as 12th Embodiment, (b) is explanatory drawing which shows another use condition of the composite magnetic member illustrated as 12th Embodiment. The top view of the composite magnetic member illustrated as 13th Embodiment. (A) is a perspective view showing a composite magnetic member and an RFID antenna substrate exemplified as the fourteenth embodiment, (b) is an explanatory view showing a use state of the composite magnetic member exemplified as the fourteenth embodiment, and (c) is the first illustration. Explanatory drawing which shows the use condition of the composite magnetic member illustrated as a modification of 14th Embodiment.

Explanation of symbols

  1, 1, 23, 31, 33a, 41, 45, 53, 55, 61, 65, 75, 91, 101, 111... Composite magnetic member, 3. , 15, 17 ... magnetic layer, 5a ... small piece of magnetic material, 5b ... thin plate-like magnetic material, 5c ... groove, 5d ... fracture surface, 7 ... second coating layer, 25 ... adhesive layer, 27 ... release paper, 33 ... composite magnetic member group, 37,81 ... electronic component, 43,95 ... hole, 47 ... band, 48 ... Adhesion part, 67 ... conductive layer, 77 ... heat conduction layer, 93 ... outer periphery, 103 ... RFID antenna substrate.

Claims (12)

A structure having a plurality of laminated layers, wherein at least a part of the plurality of layers is formed of a magnetic material between the flexible first covering layer and the second covering layer. A composite magnetic member having a structure sandwiched between
The magnetic layer has a structure in which a plurality of magnetic material pieces are arranged,
The plurality of magnetic small pieces include a thin plate-like magnetic body having grooves formed on at least one of the front and back surfaces between the first coating layer and the second coating layer, and then along the grooves. der those formed by dividing Te is,
An unevenness formed on a fracture surface when the thin plate-like magnetic body is divided along the groove, the adjacent magnetic body pieces are aligned with each other . The composite magnetic member according to claim 1, wherein the magnetic material is soft magnetic ferrite. 3. The composite magnetic member according to claim 1, wherein the soft magnetic ferrite is Ni—Zn-based ferrite, Mn—Zn-based ferrite, Ba-based ferrite, or Ferro-planar ferrite. The magnetic layer has a thickness of 0.01 mm to 1 mm.
The composite magnetic member according to any one of claims 1 to 3, wherein The groove formed in the thin plate magnetic body has a depth of 5% to 95% of the thickness of the thin plate magnetic body. Composite magnetic member. The composite magnetic member according to any one of claims 1 to 5, wherein the groove formed in the thin plate-like magnetic body has a width of 0.001 mm to 1 mm. The composite magnetic member according to any one of claims 1 to 6, wherein the magnetic small piece has a shape and a size within a range of 0.01 mm square to 5 mm square. The composite magnetic member according to any one of claims 1 to 7, wherein at least one of the first coating layer and the second coating layer is an adhesive layer formed of an adhesive material. . The composite magnetic member according to any one of claims 1 to 8, wherein at least one of the first coating layer and the second coating layer is a conductive layer formed of a conductive material. . The composite according to claim 1, wherein at least one of the first coating layer and the second coating layer is a heat conductive layer formed of a heat conductive material. Magnetic member. The thin plate-like magnetic body groove was formed by a laser processing apparatus.
The composite magnetic member according to any one of claims 1 to 10, wherein: The thin plate-like magnetic body was cracked along the groove by applying pressure with a roller.
The composite magnetic member according to claim 1, wherein:

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