JP6318524B2 - Inductor - Google Patents

Description

  The present invention relates to an inductor.

  An inductor including a member called a drum core is known (see, for example, Patent Document 1). The drum core is a member made of a magnetic material having a pair of flanges and a shaft portion. The pair of flanges face each other with the shaft portion interposed therebetween. A conductive wire is wound around the shaft portion to form a coil. One of the pair of flanges is fixed on a pedestal member including a conductive terminal and a binding terminal. Both ends of the wire forming the coil are wound around a binding terminal provided in the base member. The pedestal member is mounted on a circuit board used in an electronic device or the like, and a contact formed on the circuit board and a conductive terminal are electrically connected.

JP 2009-88355 A

  With recent miniaturization of electronic devices, there is a demand for miniaturization while maintaining the characteristics of the inductor. In the case where one of the pair of flanges included in the drum core is fixed to the pedestal member, if the size of the inductor in the direction in which the shaft portion extends is reduced, the length of the shaft portion is shortened and the number of turns of the wire is reduced. Or the thickness dimension of a flange becomes small. As a result, the inductor characteristics deteriorate. Conversely, if the characteristics of the inductor are to be maintained, the size of the inductor in the direction in which the shaft portion extends cannot be reduced.

  Therefore, an object of the present invention is to provide a technique that can meet the demand for downsizing while suppressing deterioration of the characteristics of an inductor.

In order to achieve the above object, a first aspect that the present invention can take is an inductor,
A drum core having a first flange, a shaft provided on the first side of the first flange, and a second flange facing the first flange across the shaft, and made of a magnetic material;
A conductive wire wound around the shaft to form a coil;
A first conductive portion and a second conductive portion provided on a second side opposite to the first side of the first flange;
The first flange is formed with a first groove so that a part of the first conductive portion is recessed on the first side,
A second groove is formed in the first flange so that a part of the second conductive portion is recessed on the first side,
A first end of the wire is wound around a portion including the first groove;
The second end portion of the wire is wound around a portion including the second groove portion.

  According to the inductor having such a configuration, the first flange of the drum core can be directly mounted on a circuit board used in an electronic device or the like. Specifically, the first conductive portion and the second conductive portion are electrically connected to a contact group formed on the circuit board.

  In this case, since no pedestal member is interposed between the first flange and the circuit board, the dimension in the direction in which the shaft portion of the drum core extends can be reduced. On the other hand, it becomes easier to increase the length dimension of the shaft portion as compared with the configuration in which the base member is interposed. When the dimension is increased, the number of windings of the coil formed around it can be increased, and the characteristics of the inductor are improved. Moreover, it becomes easy to enlarge the thickness dimension of at least one of a 1st flange and a 2nd flange. When the dimension is increased, the magnetic path cross-sectional area can be increased and the characteristics of the inductor are improved. Therefore, it is possible to meet the demand for downsizing while suppressing the deterioration of the characteristics of the inductor.

  Further, the first end and the second end of the wire forming the coil are wound around the first groove and the second groove of the first flange, respectively. The coil can be firmly fixed to the drum core by winding the wire around the first groove portion and the second groove portion which are part of the first flange having high rigidity. Further, since the first groove portion and the second groove portion are part of the first conductive portion and the second conductive portion 26, respectively, stable electrical connection between them and the wire can be ensured.

  The first groove portion and the second groove portion are respectively recessed on the first side. If the first end portion and the second end portion of the wire are prevented from coming out from the respective groove portions, the wire can be wound more times to increase the connection strength between the first conductive portion and the second conductive portion. The dimension of the inductor in the direction in which the part extends does not increase. Therefore, it is possible to meet the demand for downsizing while suppressing the deterioration of the characteristics of the inductor.

  The first end and the second end of the wire may be fixed to the first conductive portion and the second conductive portion by welding, respectively. In the following description, “welding” is a concept including not only the case where members to be joined are directly melted but also soldering and brazing.

  According to such a configuration, the electrical connection between the wire and the first conductive portion and the second conductive portion can be made more reliable and strong. At this time, since the first groove portion and the second groove portion function as a space for receiving the molten metal, when the inductor is mounted on the circuit board, the molten metal amount is controlled so that the first flange does not float from the circuit board. Becomes easy. Therefore, it is possible to meet the demand for downsizing while suppressing the deterioration of the characteristics of the inductor.

  It is good also as a structure provided with the 3rd electroconductive part and the 4th electroconductive part provided in the said 2nd side in the said 1st flange. In this case, a third groove is formed in the first flange so that a part of the third conductive part is recessed on the first side, and a part of the fourth conductive part is on the first side. A fourth groove is formed to be recessed. The wire includes a first wire having the first end and the second end to form a first coil, and a third wire having a third end and a fourth end to form a second coil. Includes 2 wires. The third end portion of the second wire is wound around a portion including the third conductive portion. The fourth end portion of the second wire is wound around a portion including the fourth conductive portion.

  According to such a configuration, the inductor can function as a transformer. Therefore, it is possible to meet the demand for downsizing while suppressing the deterioration of the characteristics of the inductor as a transformer.

  The third end and the fourth end of the second wire may be fixed to the third conductive portion and the fourth conductive portion by welding, respectively.

  According to such a configuration, the electrical connection between the second wire and the third conductive portion and the fourth conductive portion can be made more reliable and strong. At this time, since the third groove portion and the fourth groove portion function as a space for receiving the molten metal, when the inductor is mounted on the circuit board, the molten metal amount is controlled so that the first flange does not float from the circuit board. Becomes easy. Therefore, it is possible to meet the demand for downsizing while suppressing the deterioration of the characteristics of the inductor as a transformer.

  ADVANTAGE OF THE INVENTION According to this invention, it can respond to the request | requirement of size reduction, suppressing the characteristic fall of an inductor.

It is a disassembled perspective view which shows the structure of the inductor which concerns on one Embodiment of this invention. It is a perspective view which shows the external appearance of the said inductor. It is a 6-plane figure which shows the external appearance of the said inductor. It is a perspective view which shows the external appearance of the inductor which concerns on a modification. It is a 6th page figure showing the appearance of the inductor concerning a modification.

  Exemplary embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. In each drawing used in the following description, the scale is appropriately changed to make each member a recognizable size. The expressions “front and rear”, “left and right” and “up and down” are used for convenience of explanation, and do not limit the posture and direction in the actual use state.

  FIG. 1 is an exploded perspective view showing a configuration of an inductor 1 according to an embodiment of the present invention. The inductor 1 includes a drum core 2, a first coil 3, a second coil 4, and a ring core 5.

  The drum core 2 has a first flange 21, a second flange 22, and a shaft portion 23. The second flange 22 and the shaft portion 23 are provided on the first side (the upper side in FIG. 1) of the first flange 21. The second flange 22 is opposed to the first flange 21 with the shaft portion 23 interposed therebetween. The drum core 2 is made of a magnetic material.

  A conductive first wire and a second wire are wound around the shaft portion 23 to form a first coil 3 and a second coil 4, respectively. The first coil 3 is disposed inside the second coil 4 in the radial direction of the shaft portion 23.

  The first flanges 21 are arranged at equal intervals in the circumferential direction of the shaft part 23, and extend in the radial direction of the shaft part 23, respectively, the first arm part 21a, the second arm part 21b, the third arm part 21c, and the fourth arm. It has a portion 21d. A first groove portion 21a1 is formed in a part of the first arm portion 21a. A second groove portion 21b1 is formed in a part of the second arm portion 21b. A third groove portion 21c1 is formed in a part of the third arm portion 21c. A fourth groove portion 21d1 is formed in a part of the fourth arm portion 21d.

  A first recess 21 e that is recessed in the radial direction of the shaft portion 23 is formed between the first arm portion 21 a and the fourth arm portion 21 d in the first flange 21. A second recess 21 f that is recessed in the radial direction of the shaft portion 23 is formed between the second arm portion 21 b and the third arm portion 21 c in the first flange 21.

  A first conductive portion 25, a second conductive portion 26, a third conductive portion 27, and a fourth conductive portion are provided on a second side (lower side in FIG. 1) opposite to the first side of the first flange 21. A portion 28 is provided. The first conductive part 25, the second conductive part 26, the third conductive part 27, and the fourth conductive part 28 are formed, for example, by plating a part of the first flange 21 with a conductive material.

  The 1st electroconductive part 25 is provided so that the location in which the 1st groove part 21a1 was formed may be included. In other words, the first groove portion 21a1 is formed so that a part of the first conductive portion 25 is recessed toward the first side.

  The second conductive portion 26 is provided so as to include a portion where the second groove portion 21b1 is formed. In other words, the second groove portion 21b1 is formed so that a part of the second conductive portion 26 is recessed toward the first side.

  The third conductive portion 27 is provided so as to include a portion where the third groove portion 21c1 is formed. In other words, the third groove portion 21c1 is formed so that a part of the third conductive portion 27 is recessed toward the first side.

  The fourth conductive portion 28 is provided so as to include a portion where the fourth groove portion 21d1 is formed. In other words, the fourth groove portion 21d1 is formed so that a part of the fourth conductive portion 28 is recessed toward the first side.

  One end portion 3a (an example of the first end portion) of the first wire forming the first coil 3 is wound around a portion of the first arm portion 21a of the first flange 21 where the first groove portion 21a1 is formed. . The other end portion 3 b (an example of the second end portion) of the first wire is wound around a portion of the first arm portion 21 b of the first flange 21 where the first groove portion 21 b 1 is formed.

  One end portion 4a (an example of the third end portion) of the second wire forming the second coil 4 is wound around a portion of the third arm portion 21c of the first flange 21 where the third groove portion 21c1 is formed. . The other end portion 4b (an example of the fourth end portion) of the second wire is wound around a portion where the fourth groove portion 21d1 of the fourth arm portion 21d of the first flange 21 is formed.

  The ring core 5 is made of a magnetic material and includes a peripheral wall 5a that defines a through hole. A first protrusion 5a1, a second protrusion 5a2, a third protrusion 5a3, and a fourth protrusion 5a4 extending downward in FIG. 1 are formed at the four corners of the peripheral wall 5a. A first protrusion 5a1 and a fourth protrusion 5a4 on the peripheral wall 5a are formed with a fifth protrusion 5a5 extending downward in FIG. Between the 2nd protrusion 5a2 and the 3rd protrusion 5a3 in the surrounding wall 5a, the 6th protrusion 5a6 extended below in FIG. 1 is formed.

By assembling the drum core 2 formed with the first coil 3 and the second coil 4 and the ring core 5, the inductor 1 having the appearance shown in FIG. 2 is formed. The first coil 3 and the second coil 4 are surrounded by the peripheral wall 5 a of the ring core 5. The second flange 22 of the drum core 2 is exposed at the upper end of the through-holes partitioned by a peripheral wall 5 a.

  At this time, the first projection 5a1, the second projection 5a2, the third projection 5a3, and the fourth projection 5a4 formed on the peripheral wall 5a are respectively the first arm portion 21a, the second arm portion 21b, and the third projection 5a of the first flange 21. The ring core 5 is positioned in the axial direction of the shaft portion 23 by contacting the arm portion 21c and the fourth arm portion 21d. Further, the fifth protrusion 5a5 and the sixth protrusion 5a6 formed on the peripheral wall 5a engage with the first concave portion 21e and the second concave portion 21f of the first flange 21, respectively, and position the ring core 5 in the circumferential direction of the shaft portion 23. Do.

  FIG. 3 is a six-sided view illustrating the appearance of the inductor 1 configured as described above. 3, (a) is a plan view, (b) is a front view, (c) is a bottom view, (d) is a rear view, (e) is a right side view, and (f) is a left side view.

  As shown in FIG. 3C, solder 29 is applied so as to cover the first conductive portion 25, the second conductive portion 26, the third conductive portion 27, and the fourth conductive portion 28. Thereby, the one end part 3a and the other end part 3b of the first wire forming the first coil 3 are fixed to the first conductive part 25 and the second conductive part 26 by the solder 29, respectively. One end 4a and the other end 4b of the second wire forming the second coil 4 are fixed to the third conductive portion 27 and the fourth conductive portion 28 by solder 29, respectively.

  According to the inductor 1 having such a configuration, the first flange 21 of the drum core 2 can be directly mounted on a circuit board used for an electronic device or the like. Specifically, the first conductive portion 25, the second conductive portion 26, the third conductive portion 27, and the fourth conductive portion 28 are electrically connected to a contact group formed on the circuit board.

  In this case, since no pedestal member is interposed between the first flange 21 and the circuit board, the dimension in the direction in which the shaft portion 23 of the drum core 2 extends can be reduced. On the other hand, the length dimension of the shaft portion 23 can be easily increased as compared with the configuration in which the base member is interposed. When the dimension is increased, the number of windings of the coil formed around it can be increased, and the characteristics of the inductor 1 are improved. Further, it becomes easy to increase the thickness dimension of at least one of the first flange 21 and the second flange 22. When the dimension is increased, the magnetic path cross-sectional area can be increased, and the characteristics of the inductor 1 are improved. Therefore, it is possible to meet the demand for downsizing while suppressing deterioration of the characteristics of the inductor 1.

  According to the inductor 1 of the present embodiment, the one end portion 3a and the other end portion 3b of the first wire forming the first coil 3 are wound around the first groove portion 21a1 and the second groove portion 21b1 of the first flange 21, respectively. Yes. By winding the first wire and the second wire around the first groove portion 21a1, the second groove portion 21b1, the third groove portion 21c1, and the fourth groove portion 21d1 which are a part of the first flange 21 having high rigidity, the drum core 2 is wound around The first coil 3 and the second coil 4 can be firmly fixed. The first groove portion 21a1, the second groove portion 21b1, the third groove portion 21c1, and the fourth groove portion 21d1 are one of the first conductive portion 25, the second conductive portion 26, the third conductive portion 27, and the fourth conductive portion 28, respectively. Therefore, stable electrical connection between the first wire and the second wire can be ensured.

  The first groove portion 21a1, the second groove portion 21b1, the third groove portion 21c1, and the fourth groove portion 21d1 are each recessed on the side where the shaft portion 23 is provided (first side). If the end portions 3a, 3b, 4a, and 4b of the first wire and the second wire are prevented from coming out of the respective groove portions, the first conductive portion 25, Even if the connection strength between the second conductive portion 26, the third conductive portion 27, and the fourth conductive portion 28 is increased, the size of the inductor 1 in the direction in which the shaft portion 23 extends does not increase. Therefore, it is possible to meet the demand for downsizing while suppressing deterioration of the characteristics of the inductor 1.

  Both ends 3a, 3b, 4a, and 4b of the first wire and the second wire are fixed to the first conductive portion 25, the second conductive portion 26, the third conductive portion 27, and the fourth conductive portion 28 by solder 29, respectively. ing.

  According to such a configuration, the electrical connection between the first wire and the second wire and the first conductive portion 25, the second conductive portion 26, the third conductive portion 27, and the fourth conductive portion 28 is further improved. Can be reliable and strong. At this time, since the first groove portion 21a1, the second groove portion 21b1, the third groove portion 21c1, and the fourth groove portion 21d1 function as spaces for receiving the solder 29, the first flange 21 is connected to the circuit when the inductor 1 is mounted on the circuit board. It becomes easy to manage the amount of solder so as not to lift off the board. Therefore, it is possible to meet the demand for downsizing while suppressing deterioration of the characteristics of the inductor 1.

  In the inductor 1 of the present embodiment, the first coil 3 and the second coil 4 are formed around the shaft portion 23 of the drum core 2. By appropriately setting the wire diameter and the number of turns of the first wire and the second wire, the inductor 1 can function as a step-up transformer. Therefore, it is possible to meet the demand for downsizing while suppressing the characteristic deterioration of the inductor 1 as the step-up transformer.

  The above embodiment is for facilitating understanding of the present invention, and does not limit the present invention. The present invention can be modified and improved without departing from the spirit of the present invention, and it is obvious that the present invention includes equivalents thereof.

  In the above embodiment, the first coil 3 and the second coil 4 are formed around the shaft portion 23 of the drum core 2. However, it is good also as a structure provided only with the 1st coil 3 formed with the 1st wire. In this case, the structure for fixing the both ends 4a and 4b of the second wire forming the second coil 4 and ensuring the electrical connection is not necessary. That is, the third groove portion 21c1, the fourth groove portion 21d1, the third conductive portion 27, and the fourth conductive portion 28 can be omitted.

  The joining of the both end portions 3a and 3b of the first wire to the first conductive portion 25 and the second conductive portion 26 does not necessarily require the use of the solder 29. Members to be joined by welding may be directly melted and joined, or joining may be performed by brazing.

  The shape of the ring core 5 is not limited to that described with reference to the above embodiment. For example, the shape of the ring core 5A included in the inductor 1A according to the modification shown in FIG. 4 can be adopted. FIG. 5 is a six-sided view illustrating the appearance of the inductor 1A according to the modification. 5, (a) is a plan view, (b) is a front view, (c) is a bottom view, (d) is a rear view, (e) is a right side view, and (f) is a left side view. Constituent elements that are the same as or similar to those of the inductor 1 according to the above embodiment are given the same reference numerals, and repeated descriptions are omitted.

  The ring core 5A according to the present modification is different from the ring core 5 according to the above-described embodiment in the arrangement of protrusions for positioning the shaft portion 23 of the drum core 2 in the axial direction. In the present modification, the first protrusion 5a1, the second protrusion 5a2, and the second protrusion 5a2 are in contact with the first arm 21a, the second arm 21b, the third arm 21c, and the fourth arm 21d of the first flange 21, respectively. The three protrusions 5a3 and the fourth protrusion 5a4 are not formed on the peripheral wall 5a. Instead, the seventh protrusion 5a7 that abuts the portion of the first flange 21 between the first arm portion 21a and the second arm portion 21b, and between the third arm portion 21c and the fourth arm portion 21d of the first flange 21. The 8th protrusion 5a8 contact | abutted to this part is formed.

  1: inductor, 2: drum core, 3: first coil (first wire), 3a: one end of the first wire, 3b: other end of the first wire, 4: second coil (second wire), 4a : One end of the second wire, 4b: the other end of the second wire, 21: the first flange, 21a1: the first groove, 21b1: the second groove, 21c1: the third groove, 21d1: the fourth groove, 22: Second flange, 23: shaft portion, 25: first conductive portion, 26: second conductive portion, 27: third conductive portion, 28: fourth conductive portion, 29: solder

Claims (4)

A drum core having a first flange, a shaft provided on the first side of the first flange, and a second flange facing the first flange across the shaft, and made of a magnetic material;
A conductive wire wound around the shaft to form a coil;
A ring core having a peripheral wall surrounding the coil;
A first conductive portion and a second conductive portion provided on a second side opposite to the first side of the first flange;
The peripheral wall has a first corner and a second corner,
A first groove is formed in a part of the first flange located between the first corner and the shaft so that a part of the first conductive part is recessed toward the first side. And
A second groove is formed in a part of the first flange located between the second corner and the shaft so that a part of the second conductive part is recessed toward the first side. And
A first end of the wire is wound around a portion including the first groove;
An inductor, wherein a second end portion of the wire is wound around a portion including the second groove portion.   2. The inductor according to claim 1, wherein the first end portion and the second end portion of the wire are fixed to the first conductive portion and the second conductive portion by welding, respectively. And a third conductive portion and the fourth conductive portion provided on the second side of the first flange,
The peripheral wall has a third corner and a fourth corner,
A third groove is formed in a part of the first flange located between the third corner and the shaft part so that a part of the third conductive part is recessed toward the first side. And
A fourth groove is formed in a part of the first flange located between the fourth corner and the shaft so that a part of the fourth conductive part is recessed on the first side. And
The wire includes a first wire having the first end and the second end to form a first coil, and a third wire having a third end and a fourth end to form a second coil. Including two wires,
A third end of the second wire is wound around a portion including the third conductive portion;
The inductor according to claim 1 or 2, wherein a fourth end portion of the second wire is wound around a portion including the fourth conductive portion.   The inductor according to claim 3, wherein the third end portion and the fourth end portion of the second wire are fixed to the third conductive portion and the fourth conductive portion, respectively, by welding.

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