JP4544222B2 - Common mode choke coil - Google Patents

Description

  The present invention relates to a common mode choke coil.

  In recent years, high-frequency transmission signals are used in the USB 2.0 standard, which is a high-speed interface in personal computers, and the HDMI standard, which is a digital video / audio input / output interface such as digital video. As the transmission signal becomes higher in frequency, signals having a phase difference of 180 ° are passed through two conductors, and signals are transmitted by a differential transmission method that is hardly affected by noise and has few signal errors.

However, in reality, for example, a common mode noise current may be generated due to the difference in communication characteristics of the two conductors, and noise may be emitted using the conductor as an antenna. For example, a common mode choke coil disclosed in Patent Document 1 is disclosed. This common mode choke coil is mainly composed of a ferrite core and a pair of conductive wires. The core includes a core portion around which the conductive wire is wound and a pair of flange portions provided at both ends thereof.
JP 2003-151839 A

  However, in the common mode choke coil disclosed in Patent Document 1, the core length of the core is thick, so that the line length of the conducting wire becomes long. Therefore, the line capacity cannot be reduced and the signal passband cannot be increased to the high frequency side. Further, since the cross-sectional area of the core portion is large, the magnetic resistance is low, and the resonance point (common mode impedance) cannot be extended to the high frequency side. Furthermore, since the lead-in part to the core part of the conducting wire drawn from the collar part and the lead-out part from the core part and the conducting wire winding part of the core part are located on the same surface, the winding collapse occurs. There was a case.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a common mode choke coil capable of improving the characteristics by thinning the winding core portion and preventing the winding of the conductor from being collapsed.

To achieve the above object, the present invention provides a core having a columnar core part and a pair of flanges provided at both ends of the core part, and a pair wound around the surface of the core part. And a common mode choke coil provided with electrodes connected to the pair of flanges and connected to the pair of conductors, respectively . In the common mode choke coil, when a direction in which the axis of the core portion extends is a first direction and a predetermined direction orthogonal to the first direction is a second direction, the pair of flange portions are in the second direction. The side surface is substantially orthogonal to. The core, the pair of wires is wound from connecting wire portion the winding core portion of one of the flange portion when toward the connecting wire portion of the other flange, that the pair of wires are hooked by comprising a hooking portion that defines the lead-out portion from the inlet portion and the winding core to the winding core. The latching portion is adjacent to each flange on the inside of the pair of flanges with respect to the first direction, and is provided at a position closer to the axial center than the side surface of the flange with respect to the second direction. Yes. The winding core portion is formed as a concave portion that is recessed in a direction toward the axial center with respect to the latching portion.

  According to such a structure, since the core part is formed as a recessed part, a core part can be formed thinly. And since the latching | locking part is provided, collapse of a conducting wire does not generate | occur | produce. Furthermore, as a characteristic effect, since the length of the winding is shortened, the signal passband can be increased to the high frequency side while the line capacitance is reduced. Further, since the winding core portion is formed thin, the cross-sectional area is reduced, so that the common mode impedance can be increased to the higher frequency side.

  In addition, the hooking portions are provided at a total of four locations, two at the connection portion between the core portion and one collar portion and two at the connection portion between the core portion and the other collar portion. Is preferred. According to such a configuration, the conductive wire can be wound without worrying about the direction of the core.

  Moreover, it is preferable that this latching | locking part is formed in the shape which becomes point symmetrical with respect to the center of this core regarding this 1st direction and this 2nd direction. According to such a configuration, the conductive wire can be wound without worrying about the direction of the core. Moreover, if it is set as the structure by which a latching part is provided only in two places on a diagonal line, since there is no unnecessary latching part, it is easy to wind a conducting wire.

  Moreover, it is preferable that this latching part is provided with the convex part which prevents this pair of conducting wire from shifting | deviating to the direction of this core part by contact | abutting to this pair of conducting wire. According to such a structure, a conducting wire can be reliably latched with a simple structure. Moreover, when a convex part is formed in four places, each convex part can control the winding position of a winding part, and can prevent winding collapse.

  Moreover, it is preferable that this pair of conducting wires is wound around the surface of the core part in a state where one conducting wire and the other conducting wire are maintained at a constant interval. Here, the fixed interval includes both the case where one conductor is separated from the other conductor and the case where the conductor is in close contact. According to such a configuration, it is possible to increase the coupling between lines and further reduce the differential mode inductance.

  Further, the direction perpendicular to both the first direction and the second direction is the third direction, and the axis of the core portion is shifted from the center of the pair of flanges in the third direction. It is preferable that it exists in. According to such a configuration, any surface of the winding core portion substantially orthogonal to the third direction is further recessed. That is, the thickness of the winding core can be reduced. Accordingly, it is not necessary to make the concave portion on the side surface excessively deep, and thus the strength in the second direction (width direction) can be ensured.

  According to the common mode choke coil of the present invention, it is possible to provide a common mode choke coil corresponding to a high frequency signal (for example, 8 GHz).

  A common mode choke coil according to an embodiment of the present invention will be described with reference to FIGS. A common mode choke coil 1 shown in FIG. 1 includes a drum-shaped core 2, a first conductor 11 and a second conductor 12, a pair of first electrodes 18 and a pair of second electrodes 19 (FIG. 2, 3) and the plate core 10. 2 to 4 show a state in which the plate core 10 is not attached.

  The core 2 includes a columnar core portion 3, first and second flange portions 4 and 5 provided at both ends of the core portion 3, and first to fourth hook portions 9 to 9 (see FIG. 2 and FIG. 3). The core 2 is made of a magnetic material.

  Here, as shown in FIG. 1, the winding direction of the first conducting wire 11 and the second conducting wire 12 is the direction in which the axis A (FIGS. (First direction). Further, a direction in the width direction of the core portion 3 and connecting a first electrode 18A and a second electrode 18B, which will be described later, is a y-axis direction (second direction). Furthermore, the direction perpendicular to both the x-axis direction and the y-axis direction that is the thickness direction of the core part 3 is defined as the z-axis direction (third direction).

  As shown in FIGS. 2 to 4, the core portion 3 includes a lower surface 31 that is substantially perpendicular to the z-axis direction, an upper surface 32 that is the opposite surface of the lower surface 31, and a space between the lower surface 31 and the upper surface 32. The first side surface 33 and the second side surface 34 are substantially perpendicular to the y-axis direction. The lower surface 31 and the upper surface 32 are substantially parallel to each other, and the first side surface 33 and the second side surface 34 are also substantially parallel to each other. Therefore, the yz plane cross section of the core part 3 is substantially rectangular.

  As shown in FIGS. 1, 2, and 4, the first flange 4 includes a base 4 </ b> A, a pair of legs 4 </ b> B and 4 </ b> C that protrude downward (−z direction) from the base 4 </ b> A, and an upper (+ z direction). ) Projecting shoulder 4D. Therefore, the yz plane cross section of the 1st collar part 4 is a substantially inverted "concave" character shape. As shown in FIGS. 1 to 4, the first flange portion 4 includes a front surface 41 orthogonal to the x-axis direction, an upper surface 42 orthogonal to the z-axis direction, a first side surface 43 orthogonal to the y-axis direction, and And a second side surface 44. The front surface 41 is formed across the base 4A, the pair of legs 4B, 4C, and the shoulder 4D. The upper surface 42 is elongated in the y-axis direction on the upper surface of the shoulder 4D (FIG. 3). The upper surface 42 is joined to the plate core 10 (FIG. 1) together with the upper surface 52 described later. The first side surface 43 is formed over the base portion 4A, the leg portion 4B, and the shoulder portion 4D, and the second side surface 44 is formed over the base portion 4A, the leg portion 4C, and the shoulder portion 4D. The leg portions 4B and 4C each have a substantially square bottom surface 45 and 46 (FIG. 2). Of the four corners of the bottom surface 45, an inclined portion 45 a that is inclined toward the + y direction is formed at the corner closest to the core portion 3. That is, the inclined portion 45a is formed in a shape that is obtained by obliquely cutting off the corner portion.

  The second flange portion 5 has a configuration that is point-symmetric with the first flange portion 4 with respect to the center of the core 2 in the x-axis direction and the y-axis direction. Similar to the first collar portion 4, the second collar portion 5 includes a base portion 5A, a pair of leg portions 5B and 5C, and a shoulder portion 5D. The second flange 5 has a front surface 51 orthogonal to the x-axis direction, an upper surface 52 (FIG. 3) orthogonal to the z-axis direction, and a first side surface 53 and a second side surface 54 orthogonal to the y-axis direction. The legs 5B and 5C have bottom surfaces 55 and 56 (FIG. 2), respectively. Similarly to the inclined portion 45 a of the bottom surface 45, an inclined portion 56 a that is inclined toward the −y direction is formed at the corner portion closest to the core portion 3 among the four corner portions of the bottom surface 56.

  As shown in FIG. 1 to FIG. 4, the first latching portion 6 to the fourth latching portion 9 are inside the pair of collar portions (the first collar portion 4 and the second collar portion 5) with respect to the x-axis direction. It is provided at a position adjacent to each flange. That is, the first hook portion 6 and the second hook portion 7 are located adjacent to the first hook portion 4 in the + x direction of the first hook portion 4, and the third hook portion 8 and the fourth hook portion 9. Is in a position adjacent to the second collar part 5 in the −x direction of the second collar part 5. The first latching portion 6 to the fourth latching portion 9 are each formed as an elongated surface extending in the z-axis direction (FIGS. 1 and 4).

  Further, the first latching portion 6 to the fourth latching portion 9 are provided at positions closer to the axis A than the side surfaces of the first collar portion 4 and the second collar portion 5 in the y-axis direction. . That is, as shown in FIGS. 2 and 3, the first latching portion 6 is located closer to the axis A than the first side surface 43 of the first flange portion 4 in the y-axis direction, and the second latching portion is located. The portion 7 is located closer to the axis A than the second side surface 44 of the first flange portion 4 in the y-axis direction. Similarly, the third hooking portion 8 is located closer to the axis A than the first side surface 53 of the second collar portion 5 in the y-axis direction, and the fourth hooking portion 9 is second in the y-axis direction. It is in a position closer to the axis A than the second side surface 54 of the flange portion 5. In such a configuration, a corner 6 </ b> A is formed between the first hook 6 and the first side surface 43 of the first hook 4, and the second hook 7 and the second hook 4 are second. A corner 7 </ b> A is formed between the side surface 44. Similarly, a corner portion 8A is formed between the third hook portion 8 and the first side surface 53 of the second hook portion 5, and the fourth hook portion 9 and the second side surface 54 of the second hook portion 5 A corner 9A is formed between the two.

  As shown in FIGS. 2 and 3, the core portion 3 is a concave portion that is recessed in the direction toward the axis A with the first to fourth hook portions 9 to 9 as a reference when viewed in the xy plane. It is formed as 3a, 3b. More specifically, the first side surface 33 of the core portion 3 is located closer to the axis A than the first hook portion 6 and the third hook portion 8, and the second side surface 34 of the core portion 3. Is in a position closer to the axis A than the second latching portion 7 and the fourth latching portion 9. From the above, the first latching portion 6 to the fourth latching portion 9 are closer to the axis A than the side surfaces 43, 44, 53, 54 of the flange portions 4, 5 in the y-axis direction, and It is farther from the axis A than the side surfaces 33, 34.

  Concave defining surfaces 61, 71, 81, and 91 are provided between the first hook portion 6 to the fourth hook portion 9 and the core portion 3, respectively. The recess 3 a is defined by the first side surface 33, the recess defining surface 61 and the recess defining surface 81 of the core portion 3. A corner 33 </ b> A is formed at the boundary between the first side surface 33 and the recess defining surface 61, and a corner 33 </ b> B is formed at the boundary between the first side surface 33 and the recess defining surface 81. Similarly, the recess 3 b is defined by the second side surface 34, the recess defining surface 71 and the recess defining surface 91 of the core portion 3. A corner portion 34 </ b> A is formed at the boundary between the second side surface 34 and the recess defining surface 91, and a corner portion 34 </ b> B is formed at the boundary between the second side surface 34 and the recess defining surface 71.

  As shown in FIG. 4, when the core 2 is viewed in a side view, the core portion 3 and the first latching portion 6 to the fourth latching portion 9 have the same height (length in the z-axis direction). ing. On the other hand, the shoulder part 4D of the first collar part 4 and the shoulder part 5D of the second collar part 5 are above the upper surface 32 of the core part 3 and the upper surfaces of the first latching part 6 to the fourth latching part 9. It protrudes in the (+ z direction). A space sandwiched between the shoulder 4D and the shoulder 5D is defined as the upper recess 3c. Further, the leg portions 4B and 4C of the first collar portion 4 and the leg portions 5B and 5C of the second collar portion 5 are the lower surface 31 of the core portion 3 and the first latching portion 6 to the fourth latching portion 9. It protrudes downward (−z direction) from the lower surface. A space sandwiched between the leg portions 4B and 4C and the leg portions 5B and 5C is defined as a bottom recess 3d. Since the bottom recess 3d is formed deeper than the upper recess 3c, the axis A of the core 3 is above the center of the first flange 4 and the second flange 5 in the z-axis direction ( + Z direction) (so-called stand-off structure).

  A plate core 10 shown in FIG. 1 is a substantially rectangular parallelepiped ferrite core. The plate core 10 is joined to the upper surface 42 and the upper surface 52 (FIG. 3) of the core 2 by a resin adhesive or the like. Since the core 2 and the plate core 10 form a closed magnetic circuit, the characteristics of the common mode choke coil 1 can be improved.

  As shown in FIGS. 1 and 2, the pair of first electrode portions 18 have a first electrode 18A on the leg 4B side and a second electrode 18B on the leg 4C side by side in the y-axis direction. . The first electrode 18A is formed by plating over the bottom surface 45 and the front surface 41 of the leg portion 4B, and the second electrode 18B is formed by plating over the bottom surface 46 and the front surface 41 of the leg portion 4C. In the bottom surface 45, a part of the first electrode 18A is also formed in the inclined portion 45a. The bottom surface 45 portion of the first electrode 18A serves as a connecting portion with the first conducting wire 11, and the bottom surface 46 portion of the second electrode 18B serves as a connecting portion with the second conducting wire 12.

  As shown in FIG. 2, like the pair of first electrode portions 18, the pair of second electrode portions 19 are arranged side by side in the y-axis direction on the third electrode 19 </ b> A on the leg 5 </ b> B side and on the leg 5 </ b> C side. It has four electrodes 19B. The third electrode 19A is formed by plating over the bottom surface 55 and the front surface 51 of the leg 5B, and the fourth electrode 19B is formed by plating over the bottom surface 56 and the front surface 51 of the leg 5C. In addition, on the bottom surface 56, a part of the fourth electrode 19B is also formed in the inclined portion 56a. The bottom 55 portion of the third electrode 19 </ b> A becomes a connecting portion with the first conducting wire 11, and the bottom portion 56 of the fourth electrode 19 </ b> B becomes a connecting portion with the second conducting wire 12.

  Next, the winding configuration of the first conducting wire 11 and the second conducting wire 12 will be described. As shown in FIG. 2, one end 11A of the first conductor 11 is connected to the first electrode 18A, and one end 12A of the second conductor 12 is connected to the second electrode 18B. A method such as thermocompression bonding is used for the connection. The first conducting wire 11 and the second conducting wire 12 are each drawn from the connecting portion toward the latching portion 7 and positioned at the lower end of the latching portion 7 in a state of being in close contact with each other. More specifically, the second conducting wire 12 is positioned in contact with the corner portion 7 </ b> A, and the first conducting wire 11 is positioned by being in close contact with the second conducting wire 12. In addition, the 1st conducting wire 11 is pulled out to the latching | locking part 7 through the inclination part 45a from the connection part.

  The first conducting wire 11 and the second conducting wire 12 extend from the lower surface (FIG. 2) to the upper surface (FIG. 3) of the core 2 along the hook portion 7. Further, as shown in FIG. 3, the wiring is routed through the upper surface of the core 2 toward the corner portion 33 </ b> A, and is hooked and positioned at the upper end of the corner portion 33 </ b> A. More specifically, the second conductor 12 is positioned by contacting the upper end of the corner portion 33 </ b> A, and the first conductor 11 is positioned by being in close contact with the second conductor 12. The first conducting wire 11 and the second conducting wire 12 are started to be wound around the core portion 3 in a state of being positioned in this way.

  In the present embodiment, the first conducting wire 11 and the second conducting wire 12 are wound around the core portion 3 in a close contact state. Of course, since the first conducting wire 11 and the second conducting wire 12 are respectively coated for insulation, the core wires are wound around the core portion 3 while maintaining a certain distance while being slightly separated from each other. . On the other hand, adjacent turns (one turn) are separated from each other, and are wound at a constant separation interval.

  The first conducting wire 11 and the second conducting wire 12 wound around the winding core portion 3 a predetermined number of times are positioned in contact with the upper end of the corner portion 34A and passed through the upper surface of the core 2 (FIG. 3) to the latching portion 8. Wired toward. The first conducting wire 11 and the second conducting wire 12 extend from the upper surface (FIG. 3) to the lower surface (FIG. 2) of the core 2 along the latching portion 8, and are latched and positioned by the latching portion 8. More specifically, the first conductor 11 is positioned in contact with the lower end of the corner 8 </ b> A, and the second conductor 12 is positioned by being in close contact with the first conductor 11. At the lower end (FIG. 4) of the latching portion 8, the first conducting wire 11 and the second conducting wire 12 are separated again. The other end 11B of the first conductor 11 is connected to the third electrode 19A, and the other end 12B of the second conductor 12 is connected to the fourth electrode 19B.

  As mentioned above, as for the 1st latching | locking part 6-the 4th latching | locking part 9, the 1st conducting wire 11 and the 2nd conducting wire 12 are a core part from one collar part (this embodiment 1st collar part 4). 3 is a portion that defines an introduction portion to the core portion 3 and a lead-out portion from the core portion 3 when it is wound around 3 and directed to the other flange portion (second flange portion 5 in the present embodiment). is there. Moreover, the 1st latching | locking part 6-the 4th latching part 9 are positioning parts for prescribing | regulating the position of the winding start of the 1st conducting wire 11 and the 2nd conducting wire 12, and the end of winding, and preventing winding collapse. Furthermore, the first hook portion 6 to the fourth hook portion 9 are portions where the first lead wire 11 and the second lead wire 12 are pulled out from the flange portions 4 and 5 and hooked first. In the present embodiment, only the second latching portion 7 and the third latching portion 8 among the first latching portion 6 to the fourth latching portion 9 are actually used as the latching portions (positioning portions). .

  Alternatively, the first hooking portion 6 to the fourth hooking portion 9 are formed at the corner portions defined by the flange portions 4 and 5 and the core portion 3 and the surfaces of the flange portions 4 and 5 that define the corner portions. This is a portion that protrudes from the two surfaces of the core portion 3 that defines the corner portion with a thickness (z-axis direction length) equal to that of the core portion 3. For example, the first hooking portion 6 is a surface (parallel to the yz plane) of the flange portion 4 that defines the corner portion at the corner portion defined by the flange portion 4 and the core portion 3. Thickness equal to the core portion 3 (length in the z-axis direction) from two surfaces, that is, a surface adjacent to and substantially perpendicular to the latch portion 6 and the surface of the core portion 3 (first side surface 33) that defines the corner portion. And a projecting portion. The same applies to the second latching portion 7 to the fourth latching portion 9.

  According to the common mode choke coil 1 according to the embodiment described above, since the recesses 3a and 3b are formed in the core part 3, the core part 3 can be formed thin. In addition, since the first latching portion 6 to the fourth latching portion 9 are provided, positioning can be performed by defining the positions of the winding start and the winding end of the conducting wires 11, 12, and preventing collapse. Is possible. That is, the first hook portion 6 to the fourth hook portion 9 (actually, the second hook portion 7 and the third hook portion 8 on which the lead wires 11 and 12 are hooked) are connected to the lead wires 11 and 12. Therefore, if the first latching portion 6 to the fourth latching portion 9 are the same as the side surfaces 33 and 34 of the core portion 3, the conducting wires 11 and 12 are wound around the core. A force acts in the direction of shifting to the part 3 side. However, in the common mode choke coil 1 according to the present embodiment, the first latching portion 6 to the fourth latching portion 9 are formed as different surfaces from the side surfaces 33 and 34 of the core portion 3. 12 can be securely hooked. Therefore, it is possible to suppress the deviation of the conducting wire due to external factors such as vibration. Furthermore, as a characteristic effect, since the length of the winding is shortened, the signal passband can be increased to the high frequency side while the line capacitance is reduced. Further, since the core portion 3 is formed thin, the cross-sectional area is reduced, and therefore the common mode impedance can be increased to the higher frequency side.

  Moreover, in embodiment mentioned above, the 1st latching | locking part 6-the 4th latching | locking part 9 are two places in the connection part of the core part 3 and the 1st collar part 4, and the core part 3 and 2nd. A total of four places, two places, are provided at the connection portion with the flange 5. According to such a configuration, the conducting wires 11 and 12 can be wound without worrying about the direction of the core 2. In other words, any one of the pair of flange portions provided at both ends of the core portion 3 may be the first flange portion 4 in the positional relationship in the x-axis direction during manufacturing. Therefore, since it is not necessary to align the core 2 in the x-axis direction at the time of manufacture, unnecessary labor can be omitted and productivity can be improved.

  As shown in FIG. 4, the axis A of the core portion 3 is in a position shifted in the + z direction with respect to the centers of the first flange portion 4 and the second flange portion 5 in the z-axis direction. That is, since the bottom recessed portion 3d is recessed more deeply, the thickness of the core portion 3 can be reduced. Accordingly, there is no need to excessively deepen the side recesses 3a and 3b, so that strength in the y-axis direction (width direction) can be ensured.

  The common mode choke coil according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, the common mode choke coil 1 according to the above-described embodiment includes a total of four first latching portions 6 to fourth latching portions 9 having substantially the same shape, but the shape and number of the latching portions are limited to this. Not.

  The core 102 shown in FIG. 5A is provided with two hooking portions 107 and 108 at positions diagonal to each other when viewed in the xy plane. Moreover, the latching | locking part is not provided in the position which exists on the other diagonal. That is, the latching portions 107 and 108 are formed in positions and shapes that are point-symmetric with respect to the center position of the core in the x-axis direction and the y-axis direction. Further, the concave portion 103a and the concave portion 103b on the side surface of the core portion 3 are formed at positions shifted from each other in the x-axis direction (axial direction).

  The core 202 shown in FIG. 5B includes a total of four latching portions 206 to 209 at the connecting portion between the core portion 3, the first flange portion 4, and the second flange portion 5. Here, the lengths of the latching portions 207 and 208 in the x-axis direction are longer than the lengths of the latching portions 206 and 209 in the same direction. Therefore, the latching portions 206 to 209 in this modification are also formed in positions and shapes that are point-symmetric with respect to the center position of the core in the x-axis direction and the y-axis direction. Moreover, the recessed part 203a and the recessed part 203b of the side surface of the core part 3 are formed in the position mutually shifted | deviated regarding the x-axis direction (axial center direction).

  The core 302 shown in FIG. 5C includes two hooking portions 307 and 308 at positions that are diagonal when viewed in the xy plane. There are no hooks on the other diagonal, and the side surface 43 of the first collar 4 and the side surface 54 of the second collar 5 are each extended in the direction of the core 3. Yes. The latching portions 307 and 308 in this modification are also formed in positions and shapes that are point-symmetric with respect to the center position of the core in the x-axis direction and the y-axis direction.

  5A to 5C described above, in any of the examples, the latching portion is formed in a position and shape that is point-symmetric with respect to the center of the core in the x-axis direction and the y-axis direction. Has been. According to such a configuration, the conductive wire can be wound without worrying about the direction of the core. Further, in the example of FIG. 5A, since the latching portions 107 and 108 are provided only at two locations on the diagonal line, there is no unnecessary latching portion, and it is easy to wind the conducting wire.

  6 (a) and 6 (b) show a modified example showing another shape of the latching portion. The latching portion 409 shown in FIG. The convex portion 410 can prevent the lead wire from shifting in the direction of the core portion 3 by coming into contact with the lead wire hooked by the hook portion 409. Further, the latching portion 509 shown in FIG. 6B is formed in a shape that protrudes obliquely with respect to the axis and closer to the core portion 3. The tip portion functions as a convex portion 510. With this configuration as well, it is possible to prevent the conductive wire from shifting in the direction of the core portion 3. According to the configuration shown in FIGS. 6 (a) and 6 (b), the conducting wire can be reliably latched with a simple structure. Moreover, when the convex part 410 or 510 is formed in four places, each convex part can control the winding position of a winding part, and can prevent winding collapse.

  In embodiment mentioned above, the 1st conducting wire 11 and the 2nd conducting wire 12 are wound by the core part 3 in the state which (coating | covering) contact | adhered. However, the 1st conducting wire 11 and the 2nd conducting wire 12 may be wound by the core part 3 in the separation state which maintained the fixed space | interval. Even with this configuration, it is possible to further reduce the differential mode inductance by increasing the coupling between lines.

  In the embodiment described above, the first side surface 33 and the second side surface 34 forming the recesses 3a and 3b are formed as flat surfaces (planes). However, the shape of the recess is not limited to this. For example, a protrusion or the like for positioning the conductive wire may be provided on the first side surface 33 and the second side surface 34.

  In the embodiment described above, the axial center A of the core portion 3 is shifted upward (+ z direction) with respect to the centers of the first flange portion 4 and the second flange portion 5 in the z-axis direction. (Stand-off structure) may not be shifted. That is, the centers of the first flange portion 4 and the second flange portion 5 in the z-axis direction may coincide with the axis A of the core portion 3. Alternatively, the axis A of the core portion 3 is on the mounting surface side (−z direction) with respect to the opposite side of the structure of the embodiment, that is, the center of the first flange portion 4 and the second flange portion 5 in the z-axis direction. It may be shifted to.

  In the embodiment described above, the end portions of the first conducting wire 11 and the second conducting wire 12 are connected to the first electrode 18A to the fourth electrode 19B. However, in the state where the common mode choke coil 1 is a single component, the conducting wire may not be connected to the electrode. In this case, when the common mode choke coil 1 is assembled to a substrate or the like, the end portions of the first conducting wire 11 and the second conducting wire 12 are joined to the substrate side electrode together with the first electrode 18A to the fourth electrode 19B. The

The perspective view which shows the common mode choke coil by embodiment of this invention. The bottom view which shows the common mode choke coil by embodiment of this invention. The top view which shows the common mode choke coil by embodiment of this invention. The side view which shows the common mode choke coil by embodiment of this invention. (A), (b), and (c) in the figure is the schematic which looked at the common mode choke coil by a modification from the upper surface, respectively. (A) and (b) in a figure is a partial schematic diagram which shows the structure of the latching | locking part by a modification, respectively.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Common mode choke coil, 2 ... Core, 3 ... Core part, 3a ... Recessed part, 3b ... Recessed part, 3c ... Upper recessed part, 3d ... Bottom recessed part, 4 ... 1st collar part, 4A ... Base part, 4B ... Leg part, 4C ... Leg part, 4D ... Shoulder part, 5 ... Second collar part, 5A ... Base part, 5B ... Leg, 5C ... Leg, 5D ... Shoulder, 6 ... First hook, 6A ... Corner, 7 ... Second hook, 7A ..Corner, 8 ... third hook, 8A ... corner, 9 ... fourth hook, 9A ... corner, 10 ... plate core, 11 ... 1st conducting wire, 11A ... one end, 11B ... the other end, 12 ... 2nd conducting wire, 12A ... one end, 12B ... the other end, 18 ... A pair of first electrode portions, 18A ... first electrode, 18B ... second electrode, 19 ... a pair of second electrode portions, 19A ... third electrode, 19B ... first Four electrodes, 31 ... lower surface, 32 ... upper surface, 33 ... first side, 33A ... corner, 33B ... corner, 34 ... second side, 34A ... corner Part, 34B ... corner part, 41 ... front face, 42 ... top face, 43 ... first side face, 44 ... second side face, 45 ... bottom face, 45a ... inclined part, 46 ... Bottom, 51 ... Front, 52 ... Top, 53 ... First side, 54 ... Second side, 55 ... Bottom, 56 ... Bottom, 56a ... Inclined portion, 61, 71, 81, 91 ... concave defining surface, 102 ... core 103a, 103b ... recess, 107 ... latching part, 202 ... core, 203a, 203b ... recess, 206 ... latching part, 207 ... latching part, 302 ... A core, 307 ... a latching part, 409 ... a latching part, 410 ... a convex part, 509 ... a latching part, 510 ... a convex part.

Claims (6)

A core having a columnar core portion and a pair of flange portions provided at both ends of the core portion, a pair of conductive wires wound around the surface of the core portion , and a pair of flange portions, respectively. A common mode choke coil comprising an electrode to which the pair of conductive wires are connected ,
When the direction in which the axis of the winding core extends is the first direction, and the predetermined direction orthogonal to the first direction is the second direction, the pair of flanges have side surfaces substantially orthogonal to the second direction. And
The core, the pair of wires is wound from connecting wire portion the winding core portion of one of the flange portion when toward the connecting wire portion of the other flange, that the pair of wires are hooked includes a hook portion which defines the outlet portion of the inlet portion and the winding core to the winding core by,
The latching portion is adjacent to each flange on the inside of the pair of flanges with respect to the first direction, and is provided at a position closer to the axial center than the side surface of the flange with respect to the second direction,
The common mode choke coil, wherein the core portion is formed as a recess that is recessed in a direction toward the axis with the hook portion as a reference.   The latching portion is provided at a total of four locations, two at the connecting portion between the core portion and the one collar portion and two at the connecting portion between the core portion and the other collar portion. The common mode choke coil according to claim 1.   3. The common mode choke coil according to claim 1, wherein the latching portion is formed in a shape that is point-symmetric with respect to the center of the core in the first direction and the second direction.   The said latching | locking part is provided with the convex part which prevents this pair of conducting wire from shifting | deviating to the direction of this core part by contact | abutting to this pair of conducting wire. Common mode choke coil as described.   The pair of conductive wires are wound around the surface of the core portion with one conductive wire and the other conductive wire maintained at a constant interval. Common mode choke coil as described. The direction perpendicular to both the first direction and the second direction is the third direction,
6. The common mode choke coil according to claim 1, wherein an axis of the core portion is shifted from a center of the pair of flange portions in the third direction.

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