JP4451242B2 - Common mode choke coil - Google Patents

Description

  The present invention belongs to the technical field of a wound chip type common mode choke coil used in various electronic devices.

  The common mode choke coil is a coil component used for filtering radiation noise and the like of various electronic devices typified by personal computers, and the common of each line current flowing through a plurality of (2-4) coils with high coupling. This is one of the coil components that cancel and remove mode (in-phase component) noise.

  As a conventional structure of the wound chip type common mode choke coil, as shown in the bottom view showing the winding state of FIG. 12, the axial direction of the core portion 42 of the drum core 41 made of a ferrite material or the like is provided. The flanges 43 and 44 are provided, and a plurality of legs 45a, 45b, 46a, and 46b are provided on the lower surface of the flanges 43 and 44, and terminal electrodes 47a, 47b, and 48a are provided at the tips of the plurality of legs, respectively. , 48b are formed, and ends A1, A2, B1, B2 of a plurality of windings A (thick solid line) and B (thick broken line) wound around the core part 42 are the terminal electrodes 48a, 47a, respectively. , 48b, 47b is a common mode choke coil 40 having a structure electrically connected by soldering or the like.

  Further, in [Patent Document 1] below, as shown in a perspective view showing the appearance of FIG. 13 and a bottom view showing a winding state of the winding in FIG. 14, terminal electrodes 54a are formed on the leg portions at the four corners on the bottom side. , 54b, 55a, 55b, and a plurality of windings A (thick solid lines) and B (thick broken lines) are wound around the winding core portion of the drum core 53. As a winding structure comprising an aligned winding portion 51 in which B are alternately aligned and wound, and a separated winding portion 52 wound in an individually aligned manner, and these are connected in series A choke coil 50 is shown in which the normal mode impedance characteristics can be easily adjusted without changing the structure and shape of the drum core 53.

JP 2002-246244 A

As can be seen from FIG. 12, in the shape of the conventional drum core 41 in the wound chip type common mode choke coil which is strongly demanded for miniaturization, the terminal electrodes of the terminals A1 and B2 of the windings A and B, respectively. When joining the terminals 48a and 47b, the terminal B2 of the winding B contacts the terminal electrode 47a of the adjacent leg, or the terminal A1 of the other winding A contacts the terminal electrode 48b of the adjacent leg and short-circuits. There can be. The possibility of this short circuit is the same in the case of the drum core 53 of the choke coil 50 shown in FIG. 14 described in [Patent Document 1].

  Also, from the viewpoint of improving characteristics, it is desirable to reduce the normal impedance of the common mode choke coil. For that purpose, multiple windings to be wound are tightly bifilar wound while applying tensile tension, etc. It is particularly important to increase the coupling between the plurality of windings as much as possible.

  However, in the shape of the conventional drum-type core 41, when the winding is wound tightly to both ends of the core portion 42, the leg portions 45a, 45b, 46a, 46b from the top surface side to the bottom surface side of the core portion 42 are used. The last 180-degree turn part that reaches the terminal electrodes 47a, 47b, 48a, 48b of the coil overlaps, and damage to the winding sheath due to the stress of tension at the overlapping part, or the heat of the joint part May cause damage to the winding covering of the part. In order to avoid this, the winding turn density at both ends near the flanges 43 and 44 of the winding core portion 42 is reduced as in the portion S surrounded by the broken line shown in FIG. Inevitably (a gap is left on both ends of the core portion 42 close to the flange portions 43 and 44), and a small and highly coupled characteristic cannot be obtained.

  The present invention has been made with the aim of improving the winding structure of a wound chip type common mode choke coil including the terminal electrode, and a plurality of legs are provided on the lower surface of the flange portion of the drum core. A winding in a common mode choke coil in which terminal electrodes are respectively formed at the ends of the plurality of leg portions, and ends of the plurality of windings wound around the winding core portion are electrically connected to the terminal electrodes, respectively. The present invention provides a core structure and a winding structure that improve the space efficiency of the winding state and improve the reliability of the winding connection.

The present invention
(1) A flange portion is provided on each of the upper surface and the side surface of both ends in the axial direction of the core portion of the drum core, and a plurality of leg portions are provided on the lower surface of the region where the flange portion of the core is provided. Terminal electrodes are respectively formed at the tips of the legs, and a plurality of windings are wound around the winding core, and the ends of the plurality of wound windings are electrically connected to the terminal electrodes, respectively. In the connected common mode choke coil,
A part of the inner surface on the upper surface side facing the winding region of the winding of the flange portion of the drum core, and a part of the inner surface facing the winding region of the winding of the leg portion on the lower surface side In addition, compared to the remaining portion of the inner surface, both are set back toward the axial end surface of the core , and further, the inner surface between a part of the inner surface on the upper surface side and the remaining portion of the inner surface is inclined, The above problem is solved by providing a common mode choke coil characterized in that the winding is wound obliquely along the inner surface.
(2) Further, according to the above (1), wherein a part of the inner side surface is a flange portions provided in retracted axial end face closer than the remainder coupled with the plate-shaped magnetic core The above-mentioned problem is solved by providing a common mode choke coil.
( 3 ) Further, the winding wound around the core portion between the flange portions at both ends in the axial direction of the core portion of the drum-type core and the region where the inner side surface of the flange portion is retracted toward the end surface in the axial direction. The above problem is solved by providing the common mode choke coil according to (1) above, wherein an exterior resin layer is formed so as to cover the upper surface side of the wire.

  In the common mode choke coil according to the present invention, (1) as described above, a part of the inner surface facing the winding region of the winding of the flange portion of the drum-type core is compared with the rest of the inner surface, Since it is provided so as to recede toward the axial end surface of the core, a winding wound around the drum core in a region where a part of the inner surface of the flange portion recedes closer to the axial end surface of the core than the remaining portion. Of the windings wound around the drum-type core, it is possible to pass through the lead-out portion that leads away from the portion of the wire that wraps around the winding core and reaches the conductive connection portion with the terminal electrode of the leg portion. Further, it is possible to reliably prevent the portion that wraps around the core and the lead portion that is away from the portion that circulates the core and reaches the conductive connection portion with the terminal electrode of the leg portion.

  (2) Of the windings wound around the drum-type core, the portion around the winding core is wound within the region defined by the remaining portion of the flange, so that Even if tension is applied, the part that wraps around the core and the lead-out part that goes away from the part that circulates the core and reaches the conductive connection part with the terminal electrode of the leg do not overlap. Short circuit is unlikely to occur.

  (3) A part of the inner surface facing the winding region of the winding of the leg portion on the lower surface side of the drum-type core recedes closer to the axial end surface of the core than the remaining portion of the inner surface. Therefore, a part of the inner surface facing the winding region of the winding of the leg part is wound around the drum core in a region where it is retracted closer to the axial end surface of the core than the remaining part of the inner surface. Of the windings to be rotated, it is possible to pass through the lead-out part that leads away from the part that circulates the winding core and reaches the conductive connection part with the terminal electrode of the leg part. Can be reliably prevented, and contact between the lead portion and the terminal electrode of the adjacent leg portion and occurrence of a short circuit can be prevented.

Et al is, (4) and a portion of the inner surface facing the wound area of the winding of the flange portion of the drum core, one inner surface facing the wound area of the winding leg of the lower surface Since both of these parts are provided closer to the axial end face of the core than the remaining part of the inner surface, the windings can be wound tightly without overlapping the ends of the core. A more efficient common mode choke coil can be provided by efficiently utilizing the winding space defined by the inner surface of the collar portion with high efficiency.

( 5 ) Since the core bottom side, which is originally a dead space, is effectively utilized, the terminal electrode bonding area is sufficiently secured without wasted space, and there is no problem in terms of balance. Realizes characteristics, high reliability and downsizing. In particular, it can be used as a common mode choke coil for high-speed differential transmission.

  An embodiment of a common mode choke coil according to the present invention will be described with reference to the following drawings.

  FIG. 1 is a perspective view showing the shape of a drum core of a common mode choke coil according to the first embodiment. FIG. 2 is a perspective view showing the common mode choke coil in a state where a winding is wound around the core of the drum core. FIG. 3 shows that a plate-like magnetic core is attached to the upper surface of the flange portion provided at both axial ends of the core of the drum core of the common mode choke coil, and the flange portions at both ends are connected by the plate-like magnetic core. It is a perspective view which shows a common mode choke coil. FIG. 4 shows the winding of the winding wound around the core portion between the flange portions at both ends in the axial direction of the core portion of the drum-type core and in the region where the inner side surface of the flange portion recedes toward the axial end surface. It is a perspective view which shows the common mode choke coil in which the exterior resin layer was formed so that the upper surface side might be coat | covered. FIG. 5 is a perspective view showing an external appearance of the common mode choke coil on the bottom side of the drum core. FIG. 6 is a plan view for explaining a winding state of the drum core of the common mode choke coil according to the first embodiment. FIG. 7 is a bottom view showing a state after the conductive connection of the common mode choke coil of the first embodiment. FIG. 8 is a bottom view of the common mode choke coil according to the first embodiment. FIG. 9 is a perspective view showing an appearance of the bottom surface side of the drum core of the common mode choke coil according to the second embodiment. FIG. 10 is a bottom view showing a state after the conductive connection of the common mode choke coil of the second embodiment. FIG. 11 is a bottom view of the common mode choke coil of the second embodiment.

  As shown in FIGS. 1 to 8, in the common mode choke coils 20, 19, and 29 of the first embodiment according to the present invention, the axial direction X of the core part 2 of the drum core 1 as shown in FIG. As shown in FIG. 5, a plurality of leg portions 5a, 5b, 6a and 6b are provided on the lower surface of the flange portions 3 and 4 as shown in FIG. , 6a and 6b are respectively formed with terminal electrodes 7a, 7b, 8a and 8b. As shown in FIG. 6, windings A (thick solid lines) and B ( A part J of the inner surface facing the winding region (bold broken line) is provided so as to recede closer to each end surface 3a or 4a in the axial direction X of the core than the remaining portion K of the inner surface. An area in which a part J of the inner side surfaces of the flange parts 3 and 4 recedes closer to the axial end face of the core than the remaining part K. And the terminal electrodes 7a, 7b, 8a, 8b of the leg portions 5a, 5b, 6a, 6b apart from the portion M1 of the windings A, B wound around the drum core 1 around the core 2. The lead-out portions A11, A12, B11, and B12 that lead to the conductive connection portion can be passed.

  Further, as shown in FIG. 4, end portions A1, A2, B1, and B2 of a plurality of (two in the present embodiment) windings A and B wound around the core portion 2 are respectively the terminal electrodes. 8a, 7a, 8b, and 7b are conductively connected by thermocompression bonding or the like. In particular, as shown in FIGS. 5 and 7, the windings of the windings A and B on the lower side of the drum core 1 are wound. A part Q of the inner surface facing the turning region is provided so as to recede closer to the axial X end surfaces 3a, 4a of the core 1 than the remaining portion N of the inner surface. In a region U (within a broken line frame) in which a part Q of the inner surface facing the winding region of the winding recedes closer to the end surface 3a or 4a in the axial direction X of the core 1 than the remaining portion N of the inner surface Of the windings A and B wound around the mold core 1, the legs 5 a, 5 b, 6 a and 6 b are separated from the portion M 1 that circulates the winding core 2. Terminal electrodes 7a, can be passed through 7b, 8a, the drawer portion A12, B12, A11, B11 leading to conductive connection portion between 8b.

  In the present embodiment, the cores from the end surfaces 3a and (4a) in the core axial direction X of the plurality of leg portions 5a and 5b and (6a and 6b) provided on the flange portions 3 and (4) of the drum core 1 are described. The length dimension L in the axial direction X gradually increases along the circumferential direction R (R ′) of the windings A and B (ie, L2 <L1), and as shown in FIG. The length dimension W in the core axial direction X from the flange 3 on the upper surface of 1, the core axial direction end surface 3 a of (4), and (4 a) is along the circumferential direction R (R ′) of the windings A and B It is set to decrease gradually.

  In addition to the above configuration, in the first embodiment, the legs 6a, 5a, 6b, 5b of the ends A1, A2, B1, B2 of the windings A, B as shown in FIG. The windings A and B are arranged in a region T where the length dimension W of the flange portions 3 and 4 is reduced in the circumferential portion immediately before reaching the joint portion with each of the terminal electrodes 8a, 7a, 8b and 7b. They are wound apart from each other (in other words, with a margin without overlapping).

  The terminal electrodes 7a, 7b, 8a, 8b are terminal electrodes directly attached to the core formed by applying and baking a conductive paste, and the end portions A1, A2, B1, B2 of the windings A, B are thermocompression-bonded. Then, as shown in FIG. 8, a solder layer or a conductive resin is coated as necessary, and a metal plating layer 17 such as a solder plating layer or a tin plating layer is formed. Further, the plurality of windings A and B are insulation-coated conductive wires, and in addition to a so-called round wire in which the outer periphery of a conductive wire having a circular cross section is covered with a resin such as polyurethane, A single wire or the like is used, for example, bifilar winding with high coupling is performed.

  In addition, like the common mode choke coil 29 shown in FIG. 3, it is also preferable to form a closed magnetic circuit by disposing the plate-like magnetic core 11 on the upper surface of the drum core 1. In this case, the flange portion 3 having a portion in which a part J of the inner side surface of the drum core 1 is provided to recede toward the end surface 3a or 4a in the axial direction X as compared with the remaining portion K of the inner side surface. When the common mode choke coil 29 is mounted on a circuit board or the like by using the electronic component automatic mounting device by connecting the four to each other with the plate-like magnetic core 11, a suction error caused by the component suction nozzle of the mounting device is prevented. Generation | occurrence | production can be prevented, and the bias | inclination of the magnetic flux of the drum type core resulting from the said reversely provided part can be reduced.

  Further, like the common mode choke coil 19 shown in FIG. 4, the space between the flange portions 3 and 4 on both ends in the axial direction of the core portion 2 of the drum core 1 and the inner side surfaces of the flange portions 3 and 4 are axial. By forming the exterior resin layer 18 in the region E that has receded toward the end surface so as to cover the upper surface side of the windings A and B wound around the core portion 2, the electronic component automatic mounting apparatus can be used. In addition, when a common mode choke coil is mounted on a circuit board or the like, it is possible to prevent a suction error from occurring due to the component suction nozzle of the mounting device. Further, at this time, when the exterior resin layer 18 is applied and formed, the applied resin paint has a resin along the inner side surface having a region E in which a part of the collar portion retreats toward the end surface in the axial direction X. It is possible to reliably cover the upper surfaces of the guided and wound windings A and B and the lead portions A11, B11,.

  According to the common mode choke coils 20, 19, and 29 having the core structure and the winding state of the windings, the plurality of windings A and B of the core part 2 are the flange parts of the core part 2 from FIG. 6. It turns out that it is wound without overlapping up to the corners on the 3rd and 4th sides and can be designed compactly with good space efficiency.

  Further, of the windings A and B wound around the drum core 1, a portion M <b> 1 that wraps around the core is wound within an area defined by the remaining portion K of the flange portions 3 and 4. Therefore, even if tension is applied to the drawer portions A11, A12, B11, and B12, the terminals M1 that circulate around the core and the terminals of the legs 6a, 5a, 6b, and 5b apart from the portion M1 that circulates the core Since the lead portions A11, A12, B11, and B12 that reach the conductive connection portions with the electrodes 8a, 7a, 8b, and 7b do not overlap with each other, short-circuiting due to peeling of the coating of the wire is less likely to occur. Thus, it is possible to prevent the tensile tension stress and the joint heat from being propagated to the overlapping portions of the windings A and B and damaging the winding covering of the overlapping portions.

  Further, from FIG. 7, a part Q of the inner surface facing the winding region of the windings of the leg portions 5a, 5b, 6a, 6b on the lower surface side of the drum core 1 is compared with the remaining portion N of the inner surface. Since the core 1 is provided so as to recede toward the axial end surface 3a or 4a, a part Q of the inner surface facing the winding region of the winding of the leg portion is larger than the remaining portion N of the inner surface. Of the windings A and B wound around the drum core 1, the terminal electrodes 8 a and 7 a at the leg portions apart from the portion M 1 around the winding core in the region U receding toward the axial end surface of the core 1. 8b and 7b lead portions A11, A12, B11 and B12 leading to the conductive connection portion, the inner surface part Q facing the winding region of the windings A and B of the leg portion is the remaining portion N of the inner surface Compared with the end face 3a or 4a of the core 1 in the axial direction X, the region U retracted can be passed through, and the drawer is reduced even if the size is reduced. The portions A11, A12, B11, and B12 can be reliably prevented from overlapping each other, and contact between the lead-out portion and the terminal electrode of the adjacent leg portion and occurrence of a short circuit can be prevented. That is, by making the shapes of the legs 6a, 5a, 6b, 5b, and the terminal electrodes 8a, 7a, 8b, 7b asymmetrical, the lead portions A11 of the windings A, B reaching the respective terminal electrodes and B11 or A12 and B12 are separated from each other, and contact with adjacent terminal electrodes (the terminal electrode 8b with respect to the extraction portion A11 and the terminal electrode 7a with respect to the extraction portion B12) is prevented from being short-circuited. I understand that.

  Furthermore, a part J of the inner surface facing the winding region of the windings A and B of the flanges 3 and 4 of the drum core 1 and the winding region of the winding of the leg portion on the lower surface side are faced. Since a part Q of the inner surface is provided so as to recede toward the end surface 3a or 4a in the axial direction X of the core 1 as compared with the remaining portions K and N of the inner surface, It is possible to provide a smaller common mode choke coil by effectively utilizing the winding space defined by the inner surface.

  Thus, according to the left-right asymmetric structure of the flange portions 3 and 4 and the leg portions 5a, 5b, 6a and 6b of the drum core 1 according to the present invention, the terminal electrodes 8a of the plurality of windings A and B, 7a, 8b, and 7b are wound smoothly, and a special effect of avoiding the possibility of a short circuit can be obtained. This is the same as that of the conventional choke coils 40 and 50. This is difficult to obtain with a symmetrical structure. Although the buttocks and legs are asymmetrical left and right, they are 180 degrees rotationally symmetric around the vertical center axis, and the left and right balance of the winding state of the windings A and B is maintained. The above problem does not occur.

  By the way, the above-mentioned effect can be prevented regardless of the number of windings A and B, and the number of windings is not limited to two in the above embodiment, but may be three or more.

  The second embodiment shown in FIGS. 9, 10, and 11 is a common mode choke coil 30 in the case of three windings A, B, and C, and the core portion 22 of the drum-type core 21. The flanges 23 and 24 are provided at both ends in the axial direction, and a plurality of legs 25a, 25b, 25c, 26a, 26b, and 26c are provided on the lower surface of the flanges 23 and 24, and the tips of the plurality of legs Are formed with terminal electrodes 27a, 27b, 27c, 28a, 28b, 28c, respectively, and end portions A1, A2, B1, B2 of a plurality of windings A, B, C wound around the core portion 22, C1 and C2 are conductively connected to the terminal electrodes 28a, 27a, 28b, 27b, 28c, and 27c, respectively. In particular, a plurality of legs 25a, 25b provided on the flange portion of the drum core 21, 25c, 26a, 26b, 26c The length dimension L in the core axis direction X from the core axis direction X end faces 23a and (24a) gradually increases toward the joint portion of the winding along the winding direction R (R ') of the winding. (I.e., L3 <L2 <L1), the length in the core axial direction X from the core axial direction X end surface 23a of the flange portion of the upper surface of the drum core 21 and the length in the core axial direction X from (24a) is the same as in FIG. It is set so as to gradually decrease along the winding direction R (R ′) of the winding.

  Also in the second embodiment, a part of the inner surface facing the winding region of the windings A, B, C of the flange portions 23, 24 of the drum core 21 is the same as in FIG. Since the inner surface of the collar portion is set back toward the axial end surface of the core compared to the remaining portion of the inner surface, a part of the inner surface of the flange portion is retracted toward the axial end surface of the core compared to the remaining portion. Of the windings wound around the mold core, it is possible to pass through a lead-out portion that extends away from the portion that wraps around the core and reaches the conductive connection portion with the terminal electrode of the leg portion. Of the windings A, B, and C to be rotated, the portion M1 that circulates the winding core is wound in the region defined by the remaining portions of the flange portions 23 and 24, so that tension is applied to the drawer portion. However, the portion M1 that circulates the winding core and the terminal electrode of the leg apart from the portion that circulates the winding core Since the lead portion extending to the conductive connection portion A11, A12, B11, B12, and C11, C12 do not overlap, a short circuit due to peeling of the coating of the wire is less likely to occur.

  Further, as shown in FIG. 10, a part of the inner surface facing the winding region of the windings of the leg portions 25a, 25b, 25c, 26a, 26b, and 26c on the lower surface side of the drum core 21 is Compared to the remaining portion N of the inner surface, the core is provided so as to recede toward the end surface 23a or 24a in the axial direction X of the core, so that the inner surface facing the winding region of the windings A, B, C of the leg portion Of the windings A, B, and C wound around the drum-type core 21 in a region U (within a broken line frame) that is partially retracted closer to the axial end surface of the core 21 than the remaining portion N of the inner surface, The lead portions A11, A12, B11, B12, C11, C12 that are separated from the portion that goes around the winding core and reach the conductive connection portion with the terminal electrode of the leg portion are connected to the leg portions A11, A12, B11, B12, C11, C12. A part of the inner surface facing the winding region of the winding is compared with the remaining portion N of the inner surface. Region U retracted in the axial end surface side of the core Te can be passed through.

  Further, a part of the inner surface facing the winding region of the windings A, B, C of the flange portions 23, 24 of the drum core 21 and the winding region of the winding of the leg portion on the lower surface side are faced. Since both of the inner side surfaces to be retreated are closer to the axial end surface of the core 21 than the remaining part of the inner side surface, the winding defined by the inner side surfaces of the flange portions 23 and 24 is provided. It is possible to provide a smaller common mode choke coil by effectively using the space.

  As is apparent from FIGS. 9 and 10, the common mode choke coil 30 having the above-described structure with three windings can also have the same effects as the above-described common mode choke coil 20. . On the contrary, it can be said that the effect of the present invention becomes more noticeable as the number of windings is larger than the conventional one.

  The common mode choke coils 19, 20, 29, and 30 having the core structure and the winding structure according to the present invention as described above can obtain high characteristics with high coupling, high reliability, and for high-speed differential transmission. It is particularly effective.

  As a reminder, the common mode choke coil according to the present invention includes a resin mold type in which the outer periphery of the coil is covered with a resin material as shown in FIG. 4 and a ferrite plate-like magnetic core as shown in FIG. Of course, a common mode choke coil having a closed magnetic circuit structure in which 11 is attached to the upper surface of the drum core 1 with an adhesive or the like also enters the range.

It is a perspective view which shows the shape of the drum type core of the common mode choke coil of 1st Embodiment. It is a perspective view which shows the common mode choke coil of the state which wound the winding around the core part of the drum type core. A common mode choke in which a plate-like magnetic core is attached to the upper surface of the flange provided on both ends in the axial direction of the core of the drum core of the common mode choke coil, and the flanges on both ends are connected by the plate-shaped magnetic core. It is a perspective view which shows a coil. The upper surface side of the winding wound around the core portion is disposed between the flange portions at both ends in the axial direction of the core portion of the drum core and the region where the inner surface of the flange portion is retracted toward the axial end surface. It is a perspective view which shows the common mode choke coil in which the exterior resin layer was formed so that it might coat | cover. It is a perspective view which shows the external appearance of the bottom face side of the drum type core of the said common mode choke coil. It is a top view for demonstrating the winding state of the drum type core of the common mode choke coil of 1st Embodiment. It is a bottom view which shows the state after the conductive connection of the common mode choke coil of 1st Embodiment. It is a bottom view of the common mode choke coil of the first embodiment. It is a perspective view which shows the drum type core shape of the common mode choke coil of 2nd Embodiment. It is a bottom view which shows the state after the conductive connection of the common mode choke coil of 2nd Embodiment. It is a bottom view of the common mode choke coil of 2nd Embodiment. It is a bottom view of the conventional winding chip type common mode choke coil. It is a perspective view which shows the external appearance of the choke coil described in [Patent Document 1]. It is a bottom view showing the winding state of the winding of the choke coil described in [Patent Document 1].

1, 21 Drum-type core 2, 22 Core part 3, 4, 23, 24 ridge part 3a, 4a, 23a, 24a Core axial end surface 5a, 5b, 6a, 6b, 25a, 25b, 25c, 26a , 26b, 26c Leg 7a, 7b, 8a, 8b, 27a, 27b, 27c, 28a, 28b, 28c Terminal electrode 11 Plate-like magnetic core 17 Metal plating layer 18 Exterior resin layer 19, 20, 29, 30, 40 Common Mode choke coil 50 Choke coil A, B, C Windings A1, A2, B1, B2 Ends of windings A11, A12, B11, B12 Terminals of legs apart from the part of the winding that goes around the winding core The lead-out part that leads to the conductive connection with the electrode L The length of the leg of the drum core from the end surface in the axial direction of the core R, R 'The winding direction of the winding S The winding turn density on both ends close to the flange is sparse Nabe Minute W Length dimension of the upper surface of the drum-type core from the end surface in the axial direction of the core X Core axial direction E Region in which a part of the inner surface of the eaves portion recedes closer to the axial end surface of the core than the remaining portion J Part of the inner surface facing the winding region of the winding of the part K Remaining part of the inner surface facing the winding region of the winding of the collar part M1 Part of the winding that wraps around the core Q Winding of the leg part Part of the inner surface facing the winding area of the wire N Remaining part of the inner surface facing the winding area of the winding of the leg U Part of the inner surface facing the winding area of the winding of the leg Recessed area closer to the axial end face of the core than

Claims (3)

A flange portion is provided on each of the upper surface and side surfaces of both ends in the axial direction of the core portion of the drum core, and a plurality of leg portions are provided on a lower surface of the region where the flange portion of the core is provided. Terminal electrodes are respectively formed at the tips of the windings, and a plurality of windings are wound around the winding core, and ends of the wound windings are electrically connected to the terminal electrodes, respectively. In common mode choke coils,
A part of the inner surface on the upper surface side facing the winding region of the winding of the flange portion of the drum core, and a part of the inner surface facing the winding region of the winding of the leg portion on the lower surface side In addition, compared to the remaining portion of the inner surface, both are set back toward the axial end surface of the core , and further, the inner surface between a part of the inner surface on the upper surface side and the remaining portion of the inner surface is inclined, A common mode choke coil, wherein the winding is wound obliquely along the inner surface. The common mode choke coil according to claim 1 , wherein flange portions provided so that a part of the inner side surface recedes closer to an end surface in the axial direction than the remaining portion are connected by a plate-like magnetic core. The upper surface side of the winding wound around the core portion is disposed between the flange portions at both ends in the axial direction of the core portion of the drum core and the region where the inner surface of the flange portion is retracted toward the axial end surface. The common mode choke coil according to claim 1 , wherein an exterior resin layer is formed so as to be covered.

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