JP2009076804A - Coil part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil part which can be made small in height and has a wide adjustable range for an L value. <P>SOLUTION: A groove 11a is formed on the other end face 11A of a winding core 11 of a core 10. A depth of the groove 11a is larger than a diameter of a winding 30, and the axial center end arrangement section 33 of the winding 30 can be arranged within the groove 11a. One end 31 of the winding 30 is electrically connected with one terminal electrode 22, and a part near the opposite end to the one end 31 is set opposite to each of four side faces 11C of the winding core 11 in sequence. The winding core 11 is wound clockwise about one time by winding, and it is put into the groove 11a from one end of the groove 11a facing the one end 31. The winding passes through the groove 11a, goes out from the other end of the groove 11a to the outside thereof, and reaches the other terminal electrode 22. The other end 32 of the winding 30 is electrically connected with the other terminal electrode 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coil component, and more particularly to a coil component such as a choke coil or a high-frequency coil having a core portion and a flange portion.

As a coil component, one having a configuration including a drum core having a pair of flange portions and a core portion connecting the pair of flange portions is known. A winding made of an insulating coated copper wire is wound around the core of the drum core. A terminal electrode is provided on the collar portion, and one end or the other end of the winding is electrically connected to the terminal electrode and connected. Such a coil component is described in, for example, Japanese Patent Laid-Open No. 9-270316 (Patent Document 1).
JP-A-9-270316

  In portable electronic devices such as mobile phones, thinning and miniaturization have added value to products, and these are the pillars of the design strategy. Thinning and miniaturization of portable electronic devices are directly affected by thinning and miniaturization of electronic components such as coil components mounted on portable electronic devices. Some coil parts cannot be made into chips due to their characteristic requirements and cost merit. Coil components such as choke coils and high frequency coils are one of them. As the core of these coil parts, the above-described drum core is used. Since the drum core has a winding core part and a pair of flange parts, the height of the coil part in the direction connecting the pair of flange parts is inevitably high. There was a problem of getting higher.

  Here, in order to reduce the height of the coil component in the direction connecting the pair of flanges, it is conceivable to shorten the length of the core portion in the same direction. The range in which the value can be adjusted is narrowed, and it becomes difficult to adjust the L value to a desired value. In order to adjust the L value, the number of turns of the winding wound around the core, the thickness of the winding, or the gap between the windings wound around the core is adjusted. However, if the length of the core part in the direction connecting the pair of flanges becomes shorter, the range in which these adjustments can be made becomes smaller.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a coil component that can be reduced in height and has a wide range of L value adjustment.

  To achieve the above object, the present invention provides an axial core portion having one end, the other end, and a side surface connecting the one end and the other end, and a terminal electrode provided only at one end of the axial core portion. A flange portion, one end portion, the other end portion, a shaft core end portion disposition portion, and the shaft core portion side surface disposition portion, and the shaft core portion side surface disposition portion faces the side surface of the shaft core portion. Each of the one end and the other end each of which forms the terminal electrode or is electrically connected to the terminal electrode, and the other end of the shaft core portion is connected to one end of the shaft core portion. A conductor support portion that defines a space extending to the shaft core portion is provided in the shaft core portion, and the conductor support portion provides a coil component that supports the shaft core end portion arrangement portion.

  Since the collar portion is provided only at one end of the shaft core portion, the height of the coil component in the direction connecting the one end and the other end of the shaft core portion can be reduced, and the height can be reduced accordingly. And can be thinned. Furthermore, since the conductor support portion that defines the space extending from the other end of the shaft core portion to one end of the shaft core portion is provided in the shaft core portion, the conductor support portion supports the shaft core end portion arrangement portion. The number of turns (length) of the conductor can be adjusted without reducing the length of the shaft core. For this reason, the adjustable range of the L value can be widened.

  Here, it is preferable that the conductor support portion is composed of a portion in which a groove is formed at the other end of the shaft core portion, and the shaft core end portion disposition portion is disposed in the groove. Since the conductor support part consists of the part in which the groove | channel was formed in the other end of an axial center part, an axial core part edge part arrangement | positioning part can be supported by arrange | positioning an axial core part edge part arrangement | positioning part in a groove | channel.

  Further, the shaft core portion side surface arrangement portion has a winding portion for winding the shaft core portion side surface, and the shaft core portion end portion arrangement portion is in the direction connecting the one end and the other end of the shaft core portion. It is preferable to arrange | position at the other end side rather than a rotation part.

  In the direction connecting the one end and the other end of the shaft core portion, the shaft core end portion disposition portion is disposed on the other end side of the winding portion. Can be prevented from being unwound, etc., from being removed from the axial center.

  Moreover, it is preferable that a plurality of the grooves are formed. Since a plurality of grooves are formed, the L value can be finely adjusted by changing the arrangement of conductors arranged in the grooves.

  In addition, a spacer having a predetermined distance from one end of the shaft core portion to the end portion of the shaft core portion in the direction connecting the one end and the other end of the shaft core portion is provided at the bottom of the groove. It is preferable that

  A spacer having a predetermined distance from one end of the shaft core portion to the shaft core end portion arrangement portion in the direction connecting the one end and the other end of the shaft core portion is provided at the bottom of the groove. The distance from one end of the shaft core portion to the shaft core end portion arrangement portion in the direction can be finely adjusted, and therefore the L value can be finely adjusted.

  The groove is preferably filled with a resin that fills the groove and has the other end of the shaft core as a flat surface. Since the groove is filled with a resin that fills the groove and has the other end of the shaft core as a flat surface, when mounting on the mounting board, the coil component is attracted to the flat surface by suction with the suction nozzle. Can be adsorbed.

  Further, the other end of the shaft core portion has the other end surface, and a flat plate having a larger area than the other end surface is fixed to the other end of the shaft core portion separately from the shaft core portion. It is preferable that

  The other end of the shaft core portion has the other end surface, and the other end of the shaft core portion is provided with a flat plate having a larger area than the other end surface, which is fixed separately from the shaft core portion. When mounting on a board | substrate, a coil component can be adsorb | sucked by adsorb | sucking with respect to the said flat plate with an adsorption nozzle.

  Moreover, it is preferable that the height in the direction which connects the one end and other end of this axial center part is 1 mm or less. Since the height in the direction connecting the one end and the other end of the shaft core portion is 1 mm or less, the coil component can be made sufficiently low in profile.

  Moreover, it is preferable that this collar part consists of resin. Since the collar portion is made of resin, it is possible to prevent the collar portion from cracking or cracking even if the collar portion is configured to be thin.

  As described above, the present invention can provide a coil component that can be reduced in height and has a wide L value adjustment range.

  A coil component according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the coil component 1 is specifically configured to have a wire such as a choke coil or a high frequency coil, and includes a core 10 and a winding 30.

  The core 10 is made of a magnetic material (for example, ferrite or the like), and has a winding core portion 11 and a flange portion 21 as shown in FIG. The core part 11 has a substantially quadrangular prism shape, and a flange part 21 is provided at one end in the axial direction, and the other end face 11A is provided at the other end in the axial direction. A side surface 11 </ b> C is provided between the one end and the other end of the core portion 11 on the surface of the core portion 11 so as to connect the one end and the other end. The winding core 11 corresponds to an axial core.

  A groove 11 a is formed on the other end surface 11 </ b> A of the core part 11. As shown in FIG. 3, the groove 11 a has one short side parallel to the long side so as to connect substantially the center positions of a pair of short sides that define the other end surface 11 </ b> A of the core portion 11 having a substantially rectangular shape. To the other short side, and the value of the depth of the groove 11a is larger than the value of the diameter of the winding 30 described later. Therefore, it is configured so that a shaft core end portion arrangement portion 33 of the winding 30 described later can be arranged in the groove 11a. As shown in FIG. 3B, the space in the groove 11a is formed to extend from the other end of the core part 11 to one end of the core part 11, and forms a core part that defines the groove 11a. A portion 11 corresponds to a conductor support portion. Therefore, the conductor support portion supports an axial end portion arrangement portion 33 described later.

  3B, FIG. 6B, FIG. 9, FIG. 12B, and FIG. 15, which will be described later, a part of the winding 30 is omitted for convenience of explanation.

  The flange portion 21 is formed integrally with the core portion 11 and has a substantially rectangular plate shape with a width of 0.6 mm and a length of 0.3 mm. A total of two terminal electrodes 22, which are plating electrodes, are provided at approximately the center position of the side surfaces 11 </ b> C facing each other of the flange portion 21. The height of the core 10 in the direction connecting the one end and the other end of the core 11, that is, in the vertical direction in FIG. 1 can be used.

  As the winding 30, for example, a copper wire with a surrounding insulation coating is used, and its diameter is about 20 μm to 80 μm. The winding 30 has one end portion 31, the other end portion 32, an axial core portion end arrangement portion 33, and an axial core portion side surface arrangement portion 34. One end 31 is electrically connected to one terminal electrode 22 and connected. As shown in FIG. 3, the portion closer to the other end from the one end 31 is wound slightly less than one turn clockwise around the core 11 so as to face the four side surfaces 11C of the core 11 in order, The groove 11 a enters the groove 11 a from one end of the groove 11 a facing the one end 31. Then, one end of the core part 11 and the other than the part of the winding 30 wound around the side surface 11C of the core part 11 through the groove 11a and out of the groove 11a from the other end of the groove 11a. In the direction connecting the ends, the other end side of the winding core part 11, that is, the upper side of FIG. 2 is extended to the other terminal electrode 22, and the other end part 32 of the winding 30 is electrically connected to the other terminal electrode 22. Connected to and connected. More specifically, the electrical connection is performed by welding or soldering. The winding 30 corresponds to a conductor.

  The portion arranged in the groove 11a of the conducting wire corresponds to the shaft core end portion arranging portion 33, and the portions other than the one end portion 31, the other end portion 32 and the shaft core portion end arranging portion 33 of the conducting wire are the core. The portion corresponding to the shaft core side surface arrangement portion 34 facing the side surface 11C of the portion 11 is a part of the shaft core side surface arrangement portion 34 and the portion around the side surface 11C of the core portion 11 is wound. It corresponds to.

  Since the flange portion 21 is provided only at one end of the core portion 11, the height of the coil component 1 in the direction connecting the one end and the other end of the core portion 11, that is, the vertical direction in FIG. Accordingly, the height can be reduced and the thickness can be reduced. Further, since the groove 11 a is formed at the other end of the core part 11, the conductor support part that defines the groove 11 a can support the shaft core part end arrangement part 33. The number of turns (length) of the winding 30 can be adjusted without reducing the thickness. For this reason, the adjustable range of the L value can be widened.

  In addition, since the axial core portion end arrangement portion 33 is arranged on the other end side of the winding portion 35 in the direction connecting the one end and the other end of the winding core portion 11, the winding 30 is attached to the core portion 11. When winding a plurality of times, the winding portion 11 can be pressed from above with the shaft core end portion arrangement portion 33 to prevent so-called winding collapse or the like in which the winding 30 is detached from the axis. In addition, one end 31 of the winding 30 is connected to one terminal electrode 22 without winding around the side surface 11 </ b> C of the winding core 11, and the portion near the other end from the one end 31 of the winding 30 is immediately The groove 11a enters the groove 11a from one end of the groove 11a, passes through the groove 11a, exits the groove 11a from the other end of the groove 11a, and the other end 32 of the winding 30 is connected to the other terminal electrode 22. It is also possible to arrange the windings 30 in a straight line.

  Next, a coil component 101 according to a second embodiment of the present invention will be described with reference to FIGS. The coil component 101 according to the second embodiment is different from the first embodiment in that a plurality of grooves are formed and the arrangement of the windings 30 is different. About points other than these, it is the same as 1st Embodiment, and abbreviate | omits description. The same members as those in the first embodiment will be described using the same reference numerals.

  As shown in FIG. 6, two grooves 11a and 11b are formed in parallel. The grooves 11a and 11b are formed from one short side to the other short side in parallel to the long side defining the other end surface 11A of the core part 11 having a substantially rectangular shape. As shown in FIG. 6A, in the direction from one long side to the other long side, if the distance from one long side to the other long side is 10, the first long side to the first long side The distance to the groove 11a is 3, and the distance from one long side to the second groove 11b is 7 so as to be spaced from each other.

  Moreover, when the distance from the other end of the core part 11 to the part of the core part 11 connected to the collar part 21, that is, the distance from the right end of FIG. The depth of the groove 11a is 2, and the depth of the second groove 11b is 4, so that the depth is 4.

  One end 31 of the winding 30 is electrically connected and connected to one terminal electrode 22. As shown in FIG. 6, the portion closer to the other end from the one end portion 31 enters the second groove 11b from one end of the second groove 11b, passes through the second groove 11b, and passes through the second groove 11b. From the other end of the first groove 11b to the outside of the second groove 11b, extending along the side surface 11C and winding the side surface 11C of the winding core portion 11 clockwise to enter the first groove 11a from one end of the first groove 11a. Enters, passes through the inside of the first groove 11a, and goes out of the groove 11a from the other end of the first groove 11a. And the other end side of the core part 11 in the direction connecting the one end and the other end of the core part 11 rather than the part of the winding 30 wound on the side surface 11C of the core part 11, that is, in FIG. It passes through the upper side and extends to the other terminal electrode 22, and the other end 32 of the winding 30 is electrically connected to the other terminal electrode 22 and connected. Since the plurality of grooves 11a and 11b are formed as described above, the L value can be finely adjusted by variously changing the arrangement of the windings arranged in the plurality of grooves 11a and 11b.

  Next, a coil component 201 according to a third embodiment of the present invention will be described with reference to FIGS. The coil component 201 according to the third embodiment is different from the first embodiment in that the spacer 12 is provided at the bottom of the groove 11a. About points other than these, it is the same as 1st Embodiment, and abbreviate | omits description. The same members as those in the first embodiment will be described using the same reference numerals.

  As shown in FIGS. 7 and 9, a resin spacer 12 is provided at the bottom of the groove 11a. The spacer 12 has a predetermined thickness in the direction connecting the one end and the other end of the core 11, that is, in the left-right direction in FIG. 9, and the shaft core end disposition portion from one end of the core 11. The distance up to 33 can be set to a predetermined value. For this reason, by using spacers having different thicknesses, the distance from one end of the core portion 11 to the shaft core end portion arrangement portion 33 in the direction connecting the one end and the other end of the core portion 11 can be finely adjusted. Therefore, the L value can be finely adjusted.

  Next, a coil component 301 according to a fourth embodiment of the present invention will be described with reference to FIGS. The coil component 301 according to the fourth embodiment is different from the first embodiment in that the groove 11a is filled with a resin 13 that fills the groove 11a and has the other end of the core 11 as a flat surface. . About points other than these, it is the same as 1st Embodiment, and abbreviate | omits description. The same members as those in the first embodiment will be described using the same reference numerals.

  The groove 11a is filled with a resin 13 that fills the groove 11a. In FIG. 10, the uppermost surface of the resin 13 filling the groove 11a is flush with the other end surface 11A of the core part 11, and the other end surface 11A is entirely as if the groove 11a is not formed on the other end surface 11A. It is a flat surface. For this reason, when mounting on a mounting substrate, the coil component 301 can be adsorbed by adsorbing to the flat surface by an adsorption nozzle (not shown).

  Next, a coil component 401 according to a fifth embodiment of the present invention will be described with reference to FIGS. The coil component 401 according to the fifth embodiment is different from the first embodiment in that the flat plate 14 is provided at the other end of the core part 11. About points other than these, it is the same as 1st Embodiment, and abbreviate | omits description. The same members as those in the first embodiment will be described using the same reference numerals.

  The flat plate 14 is provided at the other end of the core part 11. The flat plate 14 has a larger area than the other end surface 11A (FIG. 14) of the winding core portion 11, and more specifically, a rectangular shape having substantially the same area as the lower surface of the flange portion 21 shown in FIG. It has a plate shape. The flat plate 14 is configured separately from the core part 11 and fixed by being attached to the other end surface 11 </ b> A of the core part 11. The flat plate 14 is made of a resin film and has a thickness of about 50 μm. Since the flat plate 14 having a larger area than the other end surface 11A is fixed to the other end of the core portion 11 separately from the core portion 11, it is not shown when mounted on the mounting board. The coil component 401 can be sucked by sucking the flat plate 14 with the suction nozzle.

  The coil component 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, in the present embodiment, the groove 11 a has a U-shape that opens to the other end of the core part 11, and the bottom surface of the groove 11 a is perpendicular to the direction connecting one end and the other end of the core part 11. However, the shape of the groove is not limited to this shape. For example, the bottom surface of the groove may be inclined, may have a tapered shape in which the width of the groove increases from the opening toward the bottom, or the cross section cut perpendicular to the extending direction of the groove has an arc shape. It may be.

  Further, when a plurality of grooves are formed, they do not have to be arranged in parallel, and without forming so as to connect the short sides defining the other end surface 11A of the substantially rectangular core part 11, for example, , One short side and one long side may be connected. In the second embodiment, the two grooves 11a have different depths, but may have the same depth.

  Moreover, although the terminal electrode 22 was provided in the collar part 21, and the one end part 31 and the other end part 32 of the coil | winding 30 were each connected to the terminal electrodes 22 and 22, it is not limited to this. For example, the one end portion 31 and the other end portion 32 of the winding 30 may constitute a terminal electrode as it is.

  Moreover, in this Embodiment, although the axial part edge part arrangement | positioning part 33 of the coil | winding 30 was arrange | positioned in the groove | channel 11a formed in the edge part of the winding core part 11, it is not limited to this structure. A conductor support portion that defines a space extending from the other end of the core portion to one end of the core portion is provided in the core portion, and the conductor support portion supports the shaft core end portion arrangement portion 33. Any configuration may be used.

  For example, a core part is constituted by a plurality of axial core parts arranged substantially in parallel, and an axial core end part arranging part 33 is arranged in a space defined between the plurality of axial core parts. The end portion arrangement portion 33 may be supported. In this case, the plurality of axial core portions correspond to conductor support portions. As the shaft core portion, for example, a columnar shape extending in a direction substantially corresponding to the upper side of FIG. 2 from a surface corresponding to the upper surface of FIG. The axial core end portion arranging portion 33 is arranged in a space formed between the plurality of columns or between the plurality of walls, and the axial core portion end arranging portion 33 is supported.

  Further, the shape of the winding core portion is not limited to the quadrangular prism shape. For example, the cross section cut perpendicularly to the axial direction of the core portion may be circular, and the core portion may be cylindrical.

  Further, the flange portion 21 may not be configured integrally with the core portion 11. For example, you may comprise a collar part with resin. By doing in this way, even if a collar part is thin, it can prevent that a collar part breaks or a crack enters a collar part.

  Further, in the fourth embodiment, the resin is filled only in the groove 11a, but the resin may be provided and molded so as to cover the groove 11a and the entire coil component 301.

  The core 10 is made of a magnetic material such as ferrite, but may be made of a non-magnetic material such as ceramic. The spacer 12 is not limited to resin.

  Moreover, although the terminal electrode 22 was comprised by the plating electrode, it is not limited to a plating electrode. For example, the terminal electrode may be constituted by a metal fitting or the like.

  The present invention is useful in the field of coil components such as choke coils and high frequency coils.

The perspective view which shows the coil components by the 1st Embodiment of this invention. The front view which shows the coil components by the 1st Embodiment of this invention. It is a figure which shows the coil components by the 1st Embodiment of this invention, (a) is a top view, (b) is a principal part fragmentary sectional view. The perspective view which shows the coil components by the 2nd Embodiment of this invention. The front view which shows the coil components by the 2nd Embodiment of this invention. It is a figure which shows the coil components by the 2nd Embodiment of this invention, (a) is a top view, (b) is sectional drawing of a principal part. The perspective view which shows the coil components by the 3rd Embodiment of this invention. The front view which shows the coil components by the 3rd Embodiment of this invention. Side part sectional drawing which shows the coil components by the 3rd Embodiment of this invention. The perspective view which shows the coil components by the 4th Embodiment of this invention. The front view which shows the coil components by the 4th Embodiment of this invention. It is a figure which shows the coil components by the 4th Embodiment of this invention, (a) is a top view, (b) is sectional drawing of a principal part. The perspective view which shows the coil components by the 5th Embodiment of this invention. The front view which shows the coil components by the 5th Embodiment of this invention. Side part sectional drawing which shows the coil components by the 5th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 101, 201, 301, 401 Coil components 10 Core 11 Core part 11A Other end surface 11a, 11b Groove 12 Spacer 13 Resin 14 Plane plate 21 Knee part 22 Terminal electrode 30 Winding 31 One end 32 Other end 33 Core part end Part placement part 34 shaft core part side face placement part

Claims (9)

An axial core having one end, the other end, and a side surface connecting the one end and the other end;
A collar portion provided only at one end of the shaft core portion and having a terminal electrode disposed thereon;
One end portion, the other end portion, an axial core portion end arrangement portion, and the axial core portion side surface arrangement portion, the axial core portion side surface arrangement portion is arranged to face the side surface of the axial core portion, and the one end Part, the other end each comprises the terminal electrode or a conductor electrically connected to the terminal electrode,
A conductor support portion that defines a space extending from the other end of the shaft core portion to one end of the shaft core portion is provided on the shaft core portion, and the conductor support portion supports the shaft core end portion arrangement portion. Coil parts characterized by that.   The coil according to claim 1, wherein the conductor support portion includes a portion in which a groove is formed at the other end of the shaft core portion, and the shaft core end portion disposition portion is disposed in the groove. parts. The shaft core side surface arrangement portion has a winding part for winding the shaft core side surface,
The axial core part end arrangement part is arranged in the other end side rather than the winding part in the direction which connects one end and the other end of this axial part, The Claim 1 or Claim 2 characterized by the above-mentioned. Coil parts.   The coil component according to claim 2 or 3, wherein a plurality of the grooves are formed.   A spacer having a predetermined distance from one end of the shaft core portion to the shaft core end portion arrangement portion in the direction connecting the one end and the other end of the shaft core portion is provided at the bottom of the groove. The coil component according to any one of claims 2 to 4, wherein the coil component is provided.   The coil component according to any one of claims 2 to 5, wherein the groove is filled with a resin filling the groove and having the other end of the shaft core portion as a flat surface.   The other end of the shaft core portion has the other end surface, and a flat plate having a larger area than the other end surface is fixed to the other end of the shaft core portion separately from the shaft core portion. The coil component according to claim 1, wherein the coil component is a coil component.   The coil component according to any one of claims 1 to 7, wherein a height in a direction connecting one end and the other end of the shaft core portion is 1 mm or less.   The coil part according to any one of claims 1 to 8, wherein the flange portion is made of resin.

Images