JP4431899B2 - Ferrite core for flat cable and electronic device using the same - Google Patents

Description

  The present invention relates to a ferrite core for a flat cable and an electronic device using the same.

  This type of ferrite core for flat cable (FC core) is attached to the flat cable, so that it absorbs noise that is generated inside the electronic device or generated outside and propagates inside the flat cable. Therefore, it can be roughly classified into a cable clamping type and a cable insertion type from the mounting mode with respect to the flat cable.

  The cable-clamping type FC core is configured by a combination of two halved cores as disclosed in Patent Document 1, for example. The split core has a concave groove on the combination surface, and by joining two of the half cores at the combination surface, a slit-like flat cable insertion hole (FC insertion hole) is formed between the concave grooves facing each other. Hole) is formed. The flat cable is guided in the concave groove in advance before the halved cores are combined, and is then sandwiched in the FC insertion hole by combining the two halved cores. The combined state of the two halved cores with respect to the flat cable is maintained by a stopper such as a core storage case or a wire harness.

  On the other hand, a cable insertion type FC core has a slit-shaped FC insertion hole formed through the core base portion as disclosed in, for example, Patent Document 2, and a flat cable is formed of this FC. It is inserted through the insertion hole. As described above, in the cable insertion type FC core, since the FC insertion hole penetrates the inside of the core base portion, stable noise absorption characteristics can be obtained, and the core storage case, wire harness, etc. can be stopped. It is superior to the cable-clamping type FC core of Patent Document 1 in that a tool is not required.

  By the way, in recent years, this type of FC core is required to be further reduced in height and thickness in order to cope with the progress of downsizing and reduction in height of electronic devices to be attached. When downsizing and reducing the height of the FC core, we will first consider reducing the thickness of the core substrate. Therefore, even if the FC core is made thinner, sufficient mechanical strength is ensured. It is required to have a structure that can be obtained.

  However, the FC core is a ferrite fired product, and shrinkage deformation in the firing process is unavoidable, and the molded product after sintering is also fragile. For this reason, when the thickness is reduced, it is essentially difficult to realize a high mechanical strength that is less deformable and difficult to break.

  For example, this type of FC core is formed by molding a ferrite granule obtained by granulating magnetic material powder together with a binder to form a ferrite molded body, and firing this ferrite molded body in a firing furnace to sinter a ceramic sintered body. (Core base part) is manufactured.

  In the conventional general manufacturing process described above, the ferrite molded body before sintering has problems such as chipping, cracking, distortion and deformation due to vibration generated when it is carried into the firing furnace and accompanying mutual collisions. Cheap. Further, the ferrite molded body also suffers from defects such as chipping, cracking, distortion and deformation due to thermal shrinkage during the firing process. Therefore, from the viewpoint of avoiding these manufacturing yield losses, it is important to ensure the mechanical strength of the FC core.

  Furthermore, the mechanical strength of the FC core is also required from the viewpoint of ensuring reliability. In particular, the cable insertion type FC core has a long and thin flat shape. Therefore, the physical impact (stress) from the outside and the stress against this stress are concentrated near the middle of the long axis, and the core base part is chipped or cracked. , Problems such as distortion and deformation are likely to occur. Such defects such as deformation cause a decrease in noise absorption characteristics.

  Also, in the cable insertion type FC core, if the FC insertion hole is deformed, the flat cable cannot be inserted, and if you try to force it, the flat cable will be damaged, and further the FC core will be damaged. Will be invited.

Furthermore, in order to reduce the size and height of the FC core, the ease of circuit board mounting of the FC core must also be considered. For example, as disclosed in Patent Document 2, in the configuration in which the FC core is mounted on the circuit board using screws, the screw fixing base is chipped or cracked due to the downsizing and low profile of the FC core. , Deformation is likely to occur.
JP-A-4-320306 JP-A-2-91903

  The subject of this invention is providing the ferrite core for flat cables which can achieve size reduction and low profile of an electronic device, and an electronic device using the same.

  Another object of the present invention is to provide a ferrite core for a flat cable that improves mechanical strength and is free from chipping, cracking, distortion, deformation, and the like, and an electronic device using the same.

  Still another object of the present invention is to provide a ferrite core for a flat cable that can be easily and reliably attached to a circuit board or a flat cable, and an electronic device using the same. That is.

  Still another object of the present invention is to provide a ferrite core for flat cables, which has a small number of parts, a high production yield, a small number of assembly steps, and a low assembly cost, and an electronic device using the same. It is to be.

  In order to solve the above-described problem, the ferrite core for flat cable (FC core) according to the present invention includes a core base portion, a flat cable insertion hole, and a convex portion. The core base portion is flat and has two main surfaces facing each other. The flat cable insertion hole (FC insertion hole) penetrates the inside of the core base portion in a direction parallel to the main surface. The convex part protrudes on at least one main surface.

  As described above, in the FC core according to the present invention, the convex portion protrudes from at least one main surface. According to this structure, the FC core has a mechanical strength that can withstand physical impact since the FC core is partially thickened by the protruding shape of the protrusion. Can do. Therefore, chipping and cracking of the core base portion, and distortion and deformation of the FC insertion hole can be prevented.

  In addition, since the core for FC is partially thickened by the protruding shape of the convex part, defects such as chipping, cracking, distortion and deformation due to thermal shrinkage during the firing process are prevented. Can be prevented. Therefore, the manufacturing yield can be improved.

  In addition, since the FC core is partially thickened by the protruding shape of the convex portion of the C core, the magnetic properties of the core can be improved and the noise absorption characteristics can be improved. .

  The FC core according to the present invention is used in an electronic device in combination with a flat cable. That is, the electronic device according to the present invention includes a flat cable and an FC core. The flat cable is inserted through the FC insertion hole. The electronic device according to the present invention can have all the advantages of the FC core described above. For example, since the FC core according to the present invention is a cable insertion type in which the FC insertion hole penetrates the core base portion, a fastener such as a core storage case or a wire harness is not required when hooking on a flat cable. . Therefore, the number of parts and the number of assembling steps can be reduced by the amount of the stopper.

  And since the convex part is protrudingly provided on the main surface in the core for FC, the insertion operation | work of the flat cable with respect to FC insertion hole is not inhibited by the convex part. Therefore, the mounting work to the flat cable can be easily and reliably performed.

  Further, in the FC core, since the convex portion protrudes on the main surface, no stress is applied to the flat cable inserted into the FC insertion hole by the convex portion. Therefore, it is possible to avoid a flat cable breakage accident, a core base part breakage accident, and the like, and improve reliability.

  Other objects, configurations and advantages of the present invention will be described in more detail with reference to the accompanying drawings. The accompanying drawings are merely examples.

As described above, according to the present invention, the following effects can be obtained.
(1) It is possible to provide a flat cable ferrite core capable of achieving a reduction in size and height of an electronic device, and an electronic device using the same.
(2) It is possible to provide a ferrite core for a flat cable in which mechanical strength is improved and no chipping, cracking, distortion or deformation occurs, and an electronic device using the same.
(3) It is possible to provide a ferrite core for a flat cable that can be easily and reliably attached to a circuit board or a flat cable, and an electronic device using the same.
(4) It is possible to provide a ferrite core for a flat cable that has a small number of parts, a high production yield, a small number of assembly steps, and a low assembly cost, and an electronic device using the same.

  1 is a perspective view of a ferrite core (FC core) for a flat cable 2 according to an embodiment of the present invention, FIG. 2 is a plan view of the FC core shown in FIG. 1, and FIG. It is sectional drawing along a line. The FC core shown in FIGS. 1 to 3 includes a core base portion 10, a flat cable insertion hole 11, and a convex portion 12.

  The core base portion 10 is flat and has two first and second main surfaces 13 and 14 facing each other. The core base 10 shown in FIGS. 1 to 3 is a cylindrical body having semicircular arcs at both ends and a straight line (track shape) between the first main surface 13 and the second main surface 14. And a first opening end face 15 and a second opening end face 16. The first and second opening end faces 15 and 16 have an elliptical shape having a minor axis direction indicated by an arrow S and a major axis direction indicated by an arrow L, and are the central axes of the core base portion 10 indicated by an arrow A. Facing in direction. The first and second main surfaces 13 and 14 are part of the peripheral surface of the core base portion 10 and face the short-axis direction S.

  The core base portion 10 forms a cylindrical peripheral surface by the first and second main surfaces 13 and 14 being continuous with the side surfaces in the major axis direction L. The FC core according to the present invention is not necessarily limited to the track shape as shown in FIGS. 1 to 3, and may be, for example, a flat rectangular tube shape.

  Each of the first and second opening end faces 15 and 16 has a tapered surface at the peripheral portion of the end surface, and an inner surface defined by the tapered surface is a protruding surface protruding in the central axis direction A. This tapered surface ensures the mechanical strength of the core base 10 against physical impact and prevents breakage accidents such as chipping and cracking at the corners.

  The flat cable insertion hole (FC insertion hole) 11 penetrates the inside of the core base portion 10 in the central axis direction A parallel to the first and second main surfaces 13 and 14, and the first and second In the plane of the opening end faces 15 and 16, the openings are respectively opened. The inner surface shape and inner diameter dimension of the FC insertion hole 11 can be freely set following the outer shape and outer dimension of the flat cable.

  The FC core according to the present invention is characterized in that, in addition to the basic configuration of the FC core described above, a convex portion 12 protrudes on at least one of the first and second main surfaces 13 and 14. There is one. In particular, in the FC core shown in FIGS. 1 to 3, the convex portion 12 has a short axis direction that intersects the penetration direction (A) of the FC insertion hole 11 at least on the first or second main surface 13 or 14. It is provided in a total of four directions on both end sides of S and both end sides in the major axis direction L, and protrudes in a strip shape or a ring shape along the peripheral surface of the core base portion 10. That is, the convex portion 12 is formed in a band shape or a ring shape over almost the entire circumference of the core base portion 10.

  Further, the convex portion 12 is arranged on one end side in the central axis direction A according to the surface position of the second opening end surface 16. With this configuration, the second opening end surface 16 has an end surface area obtained by adding the area of the opening end surface of the core base 10 to the extended area corresponding to the protruding shape of the convex portion 12.

  As described above, in the FC core described with reference to FIGS. 1 to 3, the convex portion 12 is formed in a band shape or a ring shape over substantially the entire circumference of the core base portion 10. According to this structure, at least the physical impact (stress) from the outside and the vicinity of the middle in the long axis direction L where the stress against this stress is concentrated are thickened by the protruding shape of the convex portion 12 in the FC core. Yes. Accordingly, it is possible to secure mechanical strength against external physical impact and to avoid the occurrence of damage accidents such as chipping or cracking of the core base 10 and further the occurrence of damage accidents such as distortion or deformation of the FC insertion hole 11. it can.

  Further, since the FC core is thickened by the protruding shape of the convex portion 12, it is possible to avoid defects such as chipping, cracking, distortion and deformation due to thermal shrinkage during the firing process. Therefore, the manufacturing yield can be improved.

  Furthermore, since the FC core is thickened at the protruding portion of the convex portion 12, the magnetic characteristics of the core can be improved and the noise absorption characteristics can be improved. And since the structure by which the convex part 12 protrudes on the 1st and 2nd main surfaces 13 and 14 is a shape which can be mass-produced, it can maintain high manufacturing efficiency.

  In the FC core shown in FIGS. 1 to 3, the convex portion 12 is arranged in accordance with the surface position of the second opening end surface 16. With this configuration, the second opening end surface 16 has an end surface area obtained by adding the expanded area corresponding to the protruding shape of the convex portion 12 to the area of the opening end surface of the core base body portion 10. With the second opening end face 16 as a bottom face, the FC core can be erected and conveyed. Therefore, mass conveyance and mass firing are possible, and sintering efficiency is improved.

  Moreover, according to the structure in which the convex part 12 is arrange | positioned according to the surface position of the 2nd opening end surface 16, the 2nd opening end surface 16 can be made into a bottom face, and the FC core can be stood up and fired stably. . Accordingly, it is possible to prevent the danger of mutual collision during transportation and further deformation accidents due to mutual collision. Further, by stably standing and firing the FC core, it is possible to prevent the FC core from being deformed by its own weight.

  The FC core described with reference to FIGS. 1 to 3 is combined with a flat cable or the like to constitute an electronic device. Next, an electronic device using the FC core according to the present invention will be described. FIG. 4 is a perspective view showing an electronic apparatus according to an embodiment of the present invention with a part thereof omitted. 4, the same components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals.

  Referring to FIG. 4, the electronic device according to an embodiment of the present invention has an FC core 1 and a flat cable 2, and the flat cable 2 has a connection end 21 and is connected to the FC insertion hole 11. It is inserted.

  Since the electronic device shown in FIG. 4 includes the FC core 1 described with reference to FIGS. 1 to 3, all the advantages of the FC core 1 described above can be obtained. For example, in the electronic device according to an embodiment of the present invention, the FC core 1 is a cable insertion type in which the FC insertion hole 11 passes through the core base portion 10, and thus stable noise absorption characteristics can be obtained and the core Stoppers such as storage cases and wire harnesses are not required. Therefore, the number of parts and the number of assembling steps can be reduced by the amount of the stopper.

  Conventionally, in a cable insertion type FC core, if the FC insertion hole is deformed, it becomes impossible to insert the flat cable into the FC core. In addition, as described above, there has been a problem that, for example, if the flat cable is forcibly pushed into the deformed FC insertion hole, the FC core and the flat cable are damaged. .

  In the FC core 1 according to the present invention with respect to the above-described problems related to the prior art, the protrusions 12 are provided on the first and second main surfaces 13 and 14, and the protrusions 12 protrude from the protrusions 12. Since the core base 10 is thickened by the shape and the mechanical strength is ensured, the FC insertion hole 11 is not damaged such as distortion or deformation. Therefore, the mounting operation to the flat cable 2 can be easily and reliably performed, the occurrence of the damage accident of the core base portion 10 can be avoided, and the reliability of the electronic device can be improved.

  Moreover, since the convex part 12 is protrudingly provided on the 1st and 2nd main surfaces 13 and 14, stress is applied to the flat cable 2 penetrated by the FC insertion hole 11 by the convex part 12. Absent. Therefore, it is possible to avoid the risk of the flat cable 2 being damaged or even the core base 10 being damaged after the FC core is mounted, thereby improving the reliability.

  The electronic device described with reference to FIG. 4 can further include a circuit board 3. Next, an embodiment in which the FC core 1 is combined with the circuit board 3 will be described for the electronic device according to the present invention. FIG. 5 is a side view showing the electronic apparatus according to the embodiment of the present invention with a part thereof omitted. In FIG. 5, the same components as those shown in FIGS. 1 to 4 are denoted by the same reference numerals.

  The electronic device shown in FIG. 5 includes an FC core 1, a flat cable 2, and a circuit board 3. The FC core 1 is fixed on one surface 31 of the circuit board 3 with an adhesive 4. The adhesive 4 is preferably a synthetic resin adhesive and is filled between the opposing surfaces of the main surface 13 of the FC core 1 and the one surface 31 of the circuit board 3, and around the convex portion 12. The two are bonded together in a wraparound state.

  Since the electronic device shown in FIG. 5 includes the electronic device described with reference to FIG. 4, it can have all the advantages of the FC core 1 described with reference to FIGS. For example, in the FC core 1 according to the present invention, the convex portion 12 protrudes on at least one of the first and second main surfaces 13 and 14. According to this structure, since the FC core 1 has the convex portions 12 protruding on the main surfaces 13 and 14 of the core base portion 10, the bonding area to the circuit board 3 can be expanded and the adhesive 4 It is possible to secure a contact area and a surrounding space. Therefore, the bonding strength between the FC core 1 and the circuit board 3 through the adhesive 4 is improved.

  FIG. 6 is a partial cross-sectional view showing a part of the electronic apparatus according to the embodiment of the present invention. In FIG. 6, the same components as those shown in FIGS. 1 to 5 are denoted by the same reference numerals.

  The electronic device shown in FIG. 6 differs from FIG. 5 in that the FC core 1 is erected on the circuit board 3. That is, in the implementation of the electronic apparatus shown in FIG. 6, the circuit board 3 has a through hole 33 and a locking tool 34. The through hole 33 penetrates from the one surface 31 to the other surface 32 in the plane of the circuit board 3. The locking tool 34 has, for example, a hook shape, and is disposed around the through hole 33 on the one surface 31 of the circuit board 3. The FC core 1 is fixed on the one surface 31 of the circuit board 3 in a state in which the FC core 1 is aligned with the FC insertion hole 11 and the through hole 33. The flat cable 2 passes through the FC insertion hole 11 and the through hole 33 and is drawn from the other surface 32 to the one surface 31.

  Since the electronic device shown in FIG. 6 includes the electronic device described with reference to FIG. 5, all the advantages of the FC core 1 described with reference to FIGS. 1 to 5 can be obtained. For example, in the FC core 1 according to the present invention, the convex portion 12 is arranged in accordance with the surface position of the second opening end face 16, and the second opening end face 16 is compared with the first opening end face 15. Thus, the FC core 1 is stably erected on the circuit board 3 with the second opening end face 16 as the bottom surface because the area is expanded by the protruding shape of the convex portion 12. be able to. When the FC core 1 is erected on the circuit board 3, it is preferable that the convex portion 12 be formed widely.

  As described above, according to the configuration in which the convex portion 12 is arranged in accordance with the surface position of the second opening end face 16, the FC core 1 is stable on the circuit board 3 with the second opening end face 16 as the bottom face. Can be erected. One of the advantages is that the FC core can be obtained by simply connecting the locking tool 34 and the like on the circuit board 3, and connecting the protrusion 12, which is the internal configuration of the core base 10, with the locking tool 34. 1 can be attached to the circuit board 3 and the mounting work on the board 3 is facilitated.

  Further, in the electronic device shown in FIG. 6, the FC core 1 is erected on the circuit board 3 in a state where the FC core 1 is aligned with the FC insertion hole 11 and the through hole 33. According to this configuration, the flat cable 2 can be pulled out from the other surface 32 to the one surface 31 through the FC insertion hole 11 and the through hole 33, so that the length of the flat cable 2 can be shortened and the electronic It is possible to improve the reliability by reducing the size of the device, facilitating the circuit development, and avoiding the breakage accident of the flat cable 2.

  FIG. 7 is a partial cross-sectional view showing a part of the electronic apparatus according to the embodiment of the present invention. In FIG. 7, the same components as those shown in FIGS. 1 to 6 are denoted by the same reference numerals.

  The electronic device shown in FIG. 7 is different from FIG. 6 in that the FC core 1 itself is disposed through the circuit board 3. That is, in the implementation of the electronic device shown in FIG. 7, the circuit board 3 has the through-hole 33 in the plane. The through hole 33 penetrates the circuit board 3 from the one surface 31 to the other surface 32. The FC core 1 is inserted into the through hole 33 from the other surface 32 side and penetrates the circuit board 3, and the convex portion 12 is hooked around the periphery of the through hole 33 on the other surface 32. The latching portion between the peripheral edge of the through hole 33 and the convex portion 12 is preferably filled with the adhesive 4 and the latching state of both is maintained.

  Since the electronic device shown in FIG. 7 includes the electronic device described with reference to FIG. 6, all the advantages of the FC core 1 described with reference to FIGS. 1 to 6 can be obtained. For example, the FC core 1 is inserted into the through hole 33 from the other surface 32 side and penetrates the circuit board 3, and the convex portion 12 is hooked around the periphery of the through hole 33 on the other surface 32. A stopper such as a storage case or a wire harness is not necessary, and the mounting work to the substrate 3 is easy.

  Since the FC core 1 has the convex portion 12 protruding on the outer peripheral surface of the core base portion 10, the bonding area to the circuit board 3 can be expanded, the contact area of the adhesive 4, and the wraparound Space can be secured. Moreover, the convex portion 12 is hooked around the periphery of the through hole 33. Therefore, the bonding strength between the FC core 1 and the circuit board 3 through the adhesive 4 is improved.

  The shape of the convex portion 12 is easy to mold and excellent in mechanical strength. For example, a screw fixing base is formed on the periphery of the core base 10 and the core is mounted on a circuit board using screws ( Unlike Patent Document 2), the manufacturing yield can be improved.

  Further, in the substrate through type electronic apparatus shown in FIG. 7, the FC core 1 penetrates the circuit board 3, and the convex portion 12 is hooked around the periphery of the through hole 33 on the other surface 32. According to this configuration, the protrusion distance H2 of the core base portion 10 on the one surface 31 is the same as the protrusion distance H3 of the protrusion 12 on the other surface 32 side, so that the core base portion 10 in the embodiment shown in FIG. The protrusion distance H1 can be made smaller. Accordingly, the electronic device can be further reduced in height.

  8 and 9 are plan views of the FC core 1 according to another embodiment of the present invention. 10 to 12 are plan views of the FC core 1 according to still another embodiment of the present invention. 8 to 12, the same components as those shown in FIGS. 1 to 7 are denoted by the same reference numerals.

  In the FC core 1 shown in FIG. 8, the convex portion 12 is on the first and second main surfaces 13 and 14 facing the minor axis direction S and is aligned with the surface position of the second opening end surface (16). Arranged along the long axis direction L.

  In the FC core 1 shown in FIG. 9, the convex portion 12 is on the first and second main surfaces 13 and 14 facing the minor axis direction S, and is aligned with the surface position of the second opening end surface (16). And projecting in the vicinity of the middle in the long axis direction L.

  In the FC core 1 shown in FIG. 10, the convex portion 12 extends over substantially the entire circumference of the core base portion 10 in the intermediate portion in the central axis direction A between the first and second opening end faces 15 and 16. It is formed in a ring shape.

  In the FC core 1 shown in FIG. 11, two convex portions 12 are formed in accordance with the surface positions of the first and second opening end surfaces 15 and 16, and each convex portion 12 is formed of the core base portion 10. Is formed in a ring shape over almost the entire circumference.

  In the FC core 1 shown in FIG. 12, the convex portion 12 has a central axis on the first and second main surfaces 13 and 14 in the vicinity of the middle portion in the major axis direction L on the peripheral surface of the core base portion 10. It protrudes in a strip shape along the direction A.

  Any of the embodiments of the FC core shown in FIGS. 8 to 12 can have all the advantages described with reference to FIGS. 1 to 7. For example, also in the FC core shown in FIGS. 8 to 12, on the first and second main surfaces 13, 14, at least the middle portion in the long axis direction L is thickened by the convex portion 12. From the outside, when the physical impact (stress) from the outside or stress against this stress is concentrated in the vicinity of the middle portion in the long axis direction L, the convex portion 12 counters these physical impacts and damages the core base 10. In addition, the occurrence of a deformation accident of the FC insertion hole 11 is prevented.

  Although the contents of the present invention have been specifically described above with reference to the preferred embodiments, it is obvious that those skilled in the art can take various modifications based on the basic technical idea and teachings of the present invention. It is.

It is a perspective view of the ferrite core for flat cables (FC core) which concerns on one Embodiment of this invention. It is a top view of the core for FC shown in FIG. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2. It is a perspective view which abbreviate | omits and shows the electronic device which concerns on one Embodiment of this invention. It is a side view which abbreviate | omits and shows the electronic device which concerns on one Embodiment of this invention. It is a fragmentary sectional view which abbreviate | omits and shows the electronic device which concerns on one Embodiment of this invention. It is a fragmentary sectional view which abbreviate | omits and shows the electronic device which concerns on one Embodiment of this invention. It is a top view of the core for FC which concerns on another embodiment of this invention. It is a top view of the core for FCs concerning another embodiment of this invention. FIG. 6 is a perspective view of an FC core according to still another embodiment of the present invention. FIG. 6 is a perspective view of an FC core according to still another embodiment of the present invention. FIG. 6 is a perspective view of an FC core according to still another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Core for FC 10 Core base part 11 Flat cable insertion hole 12 Convex part 13, 14 1st, 2nd main surface 2 Flat cable 3 Circuit board 31, 32 One side, other side 33 Through-hole A Center axis of core base part Direction L Long axis direction of the opening end face S Short axis direction of the opening end face

Claims (8)

An electronic device having a circuit board, a ferrite core for a flat cable, and a flat cable,
The circuit board has a through hole in a plane,
The through hole penetrates the circuit board from one surface to the other surface,
The ferrite core for flat cable has a core base part, a flat cable insertion hole, and a convex part,
The core base portion is flat and has two main surfaces,
The two principal surfaces are facing opposite to each other;
The flat cable insertion hole penetrates the inside of the core base portion in a direction parallel to the main surface,
The convex portion protrudes on at least one of the main surfaces,
The ferrite core for the flat cable is placed on the one surface of the circuit board in a state where the flat cable insertion hole and the through hole are aligned coaxially,
The flat cable is inserted through the flat cable insertion hole,
Electronics. An electronic device according to claim 1,
The convex portion protrudes in the middle of the major axis direction perpendicular to the penetration direction of the flat cable insertion hole on the main surface.
Electronics. The electronic device according to claim 1 or 2,
The convex portion extends along the long axis direction orthogonal to the penetrating direction of the flat cable insertion hole ,
Electronics. An electronic device according to claim 3 ,
The convex portion is formed in a ring shape over the entire circumference of the core base portion.
Electronics. An electronic device having a circuit board, a ferrite core for a flat cable, and a flat cable,
The circuit board has a through hole in a plane,
The through hole penetrates the circuit board from one surface to the other surface,
The ferrite core for flat cable has a core base part, a flat cable insertion hole, and a convex part,
The core base portion is flat and has two main surfaces,
The two principal surfaces are facing opposite to each other;
The flat cable insertion hole penetrates the inside of the core base portion in a direction parallel to the main surface,
The convex portion protrudes on at least one of the main surfaces,
The ferrite core for flat cable is inserted into the through hole from the other surface side and penetrates the circuit board, and the convex portion is hooked around the periphery of the through hole on the other surface.
The flat cable is inserted through the flat cable insertion hole,
Electronics. The electronic device according to claim 5,
The convex portion protrudes in the middle of the major axis direction perpendicular to the penetration direction of the flat cable insertion hole on the main surface.
Electronics. The electronic device according to claim 5 or 6,
The convex portion extends along the long axis direction orthogonal to the penetrating direction of the flat cable insertion hole,
Electronics. The electronic device according to claim 7,
The convex portion is formed in a ring shape over the entire circumference of the core base portion.
Electronics.

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