JP2008159610A - Winding coil part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a winding coil part of which air-wiring part of the winding is eliminated as much as possible and wherein disconnection of the winding can be surely prevented. <P>SOLUTION: The winding coil part 10 is provided with a core 11 which is provided with a winding core 11A and a pair of flanges 11B formed at both ends, two windings 12 wound around the winding core 11A, terminal electrodes to which both ends of the winding 12 are connected and which are formed in the respective flanges 11B, and a top plate 13 bridged between the flanges 11B. Projections 11C are formed at the center of end faces of the flanges 11B to join with the top plate 13, and the terminal electrodes are arranged aside the projections 11C of the flanges 11B respectively. The crossing point of the shaft core of winding ends 12A and 12B of the winding 12 and the inner side face of the flange 11B on the respective terminal electrodes is only 0.2 mm or less outward in the horizontal direction and is only 0.3 mm or less upward in the vertical direction away from the crossing point of the corner on the upper face of the winding core 11A and the inner side face of the flange 11B. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wire-wound coil component, and more particularly to a wire-wound coil component that can prevent a wire breakage of a wire-wound coil component coated with a resin on a substrate.

  As a conventional wire-wound coil component, for example, there is a coil component described in Patent Document 1. In Patent Document 1, a method for manufacturing a coil component is proposed in which a method for connecting a winding and a terminal electrode is devised. This coil component includes a magnetic core having a core part and flanges formed at both ends of the core part, and metal terminals (terminal electrodes) attached to both sides of each flange part, and a terminal electrode Are arranged on both sides of the protrusion at the center of the end face of the collar. When making a coil component, one end of two windings is tangled to two terminal electrodes attached to both sides of the protruding part of one flange part, and the two windings are wound around the core part. After winding the wire, the other ends of the two windings are respectively tangled to the two terminal electrodes of the other flange part, and then the two wire wires are fixed to the terminal electrodes. Produced.

  Such a coil component is used after soldering to a mounting substrate and then applying a moisture-proof coating resin to the surface. The coil component is covered with a moisture-proof coating resin on a mounting board such as a printed board and is protected from the outside.

JP2006-121013

  However, even if the coil component described in Patent Document 1 is mounted on a mounting substrate and then the coil component is protected with a moisture-proof coating resin, there are the following problems. That is, in the case of a conventional coil component, for example, as shown in FIG. 4, a protrusion 1B is formed at the center of the upper surface of the flange 1A of the core 1, and the upper surface 1C of the flange 1A on both sides of the protrusion 1B. Are provided with terminal electrodes (not shown). In the figure, the upper surface 1C of the flange portion 1A will be described as the upper surface 1C of the terminal electrode. As shown in FIG. 4, since the upper surface 1C of the terminal electrode and the core portion 1D are considerably separated, the winding 2 wound around the core portion 1D from the upper surface 1C of the terminal electrode is connected to the inner surface or winding of the flange portion 1A. The aerial wiring portions 2A and 2B are formed away from the side surface of the core portion 1D and wired in the air. More specifically, when winding the winding 2 around the core portion 1D, generally, the first turn of the winding 2 starts to be pressed against the flange portion 1A. It is close to the buttocks 1A and only slightly apart. However, in order to take into account variations in the winding diameter and the finished dimensions of the core at the design stage, as shown in FIG. 4, the final turn portion 2C is designed to leave a dimensional margin M of one turn or more at the end of winding as shown in FIG. Is pulled out to the terminal electrode of the collar part leaving a space of about 0.1 to 1.0 mm as a margin M between the inner surface of the collar part 1A, and the aerial wiring parts 2A and 2B are easily formed.

  When such a coil component is mounted on a mounting substrate and the moisture-proof coating resin 3 is applied to the coil component, the space between the aerial wiring portions 2A and 2B of the winding 2 and the inner side surface 1A of the core 1 and the core portion 1D The moisture-proof coating resin 3 adheres to the surface. As a result, the aerial wiring portions 2A and 2B are connected to the inner side surface of the flange portion 1A and the core portion 1D by the moisture-proof coating resin 3, and the moisture-proof coating resin 4 repeatedly expands and contracts due to temperature changes, so that the aerial wiring portions. Stress may repeatedly act on 2A and 2B, leading to disconnection. In particular, in the case of a vehicle-mounted substrate, the above-described moisture-proof coating resin 3 is applied, so that disconnection caused by the aerial wiring portions 2A and 2B becomes a serious problem.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a wire-wound coil component that can reliably prevent a wire breakage due to an aerial wiring portion.

According to a first aspect of the present invention, there is provided a wound-type coil component including a core having a core portion and a pair of flanges formed at both ends thereof, a winding wound around the core portion, and the winding. In a wound coil component comprising terminal electrodes respectively connected to both ends and formed on each of the flanges, and a top plate laid between the flanges, the center of the end surface of each of the flanges Are formed with protrusions to which the top plate is joined, and the terminal electrodes are arranged on both sides of the protrusions of the flanges, respectively, and on the terminal electrodes. The intersection of the winding core and the inner surface of the flange is separated by 0.2 mm or less outward in the horizontal direction from the intersection of the corner on the protrusion side of the winding core and the inner surface of the flange. It is located at a distance of 0.3 mm or less upward in the vertical direction. It is intended to.

According to a second aspect of the present invention, the wire-wound coil component according to the first aspect of the present invention has a length of 5.0 mm x 4.5 mm to 3.2 mm x 2 mm. It is formed in the dimension of .5 mm.

ADVANTAGE OF THE INVENTION According to this invention, the winding type coil components which can prevent the disconnection of the winding | winding resulting from an aerial wiring part reliably can be provided.

  Hereinafter, the present invention will be described based on the embodiment shown in FIGS. In each figure, FIGS. 1A to 1C are views showing one embodiment of the wire-wound coil component of the present invention, and FIG. 1A is a view in which the core is cut in a direction perpendicular to the axis. (B) is a front view from above of (a), (c) is a front view from the lateral direction of (a), and (a) and (b) of FIG. 2 are windings shown in FIG. FIG. 3 is a cross-sectional view corresponding to FIG. 1 (a) showing another embodiment of the wire-wound coil component of the present invention. .

  For example, as illustrated in FIGS. 1A to 1C, the wound coil component 10 of the present embodiment includes a core 11 having a core 11 </ b> A and a pair of flanges 11 </ b> B formed at both ends thereof, Two windings 12 wound around the core portion 11A and both ends (winding start portion and winding end portion) of the two windings 12 are individually connected to each other, and each flange portion 11B (in FIG. 1). Only the winding end portion of the winding is shown.) Four terminal electrodes (not shown) formed at two locations on the upper surface of each of the windings, and a ceiling installed between the pair of flange portions 11B. Plate 13 and is formed so that its outer shape is rectangular. The core 11 and the top plate 13 are each formed of a ceramic material such as ferrite. The winding 12 is covered with an insulating film.

  As shown in FIG. 1A, a protrusion 11C is formed at the center of the upper surface of the flange portion 11B with a predetermined thickness and the same thickness as the flange portion 11B, and the flange portions 11B on both sides of the protrusion portion 11C. Terminal electrodes are fixed to the upper surfaces 11D and 11D. The left and right upper surfaces 11D and 11D of the flange portion 11B are symmetrical with respect to a vertical plane passing through the axis of the winding core portion 11A. The top plate 13 is bonded to the upper surface of the protruding portion 11C via an adhesive, and forms a closed magnetic circuit in the wound coil component 10. In addition, the terminal electrode is abbreviate | omitted in (a)-(c) of FIG. 1, and the upper surface 11D of the collar part 11B is demonstrated as the upper surface 11D of a terminal electrode below.

  Thus, the winding core portion 11A has a rectangular cross section as shown in FIG. Two windings 12 are wound around the winding core portion 11A by bifilar winding, and winding end portions 12A and 12B of these windings 12 are respectively shown in (a) to (c) of FIG. The left and right terminal electrodes 11D and 11D of the flange portion 11B are electrically connected to each other. The two winding end portions 12A and 12B are arranged so as to be almost in contact with both side surfaces of the protruding portion 11C as shown in FIG. Further, the upper surface 11E of the winding core portion 11A is formed to be lower than the upper surfaces 11D and 11D of the left and right terminal electrodes of the flange portion 11B by the wire diameter of the winding 12 in FIG. The left and right side surfaces 11F and 11F of the winding core portion 11A are formed on the center side by the wire diameter of the winding 12 from the both side surfaces of the projecting portion 11C in FIG.

  Therefore, the positional relationship between the winding core portion 11A and the winding end portions 12A and 12B of the winding 12 will be described. The intersection C1 between the axial ends of the winding end portions 12A and 12B connected to the terminal electrode and the inner surface of the flange portion 11B is a corner portion on the upper surface of the winding core portion 12 (a line where the upper surface 11E intersects both side surfaces 11F and 11F). ) And the inner surface of the flange 11B from the intersection C2 to the outside in the horizontal direction (hereinafter referred to as “horizontal dimension”) δ1, and the dimension in the vertical direction upward (hereinafter referred to as “vertical dimension”). ”).

  2A and 2B show the results of verifying the relationship between the dimensions δ1 and δ2 and the disconnection rate of the winding 12 by experiments by changing the horizontal dimension δ1 and the vertical dimension δ2. In this experiment, ten samples of the wound coil component 10 with different horizontal dimensions δ1 and vertical dimensions δ2 shown in FIGS. 2A and 2B were prepared, and each sample was mounted on a mounting board. After applying the moisture-proof coating resin, the temperature was changed every 30 minutes in the range of −40 ° C. to + 125 ° C., and the presence or absence of disconnection of each sample was examined. FIG. 2A shows the relationship between the horizontal dimension δ1 and the disconnection rate of the winding 12 when the vertical dimension δ2 is fixed to 0.1 mm and the horizontal dimension δ1 is changed from 0 to 0.4 mm. (B) of 2 shows the relationship between the vertical dimension δ2 and the disconnection rate of the winding 12 when the horizontal dimension δ1 is fixed to 0.1 mm and the vertical dimension δ2 is changed from 0 to 0.4 mm. The size of the sample used in this experiment was 4.5 mm long × 3.2 mm wide × 2.8 mm high.

  According to the result shown in FIG. 2A, the winding 12 has a disconnection rate of 0% when the horizontal dimension δ1 is in the range of 0 to 0.2 mm, that is, the winding 12 has no disconnection, but the horizontal dimension δ1. When the thickness exceeds 0.2 mm, the winding 12 is disconnected, and the disconnection rate increases rapidly. Further, according to the result shown in FIG. 2B, the winding 12 has a disconnection rate of 0% in the range where the vertical dimension δ2 is 0 to 0.3 mm, that is, the winding 12 was not disconnected. It has been found that when the dimension δ2 exceeds 0.3 mm, the winding 12 is disconnected and the disconnection rate is rapidly increased. From these results, it was found that disconnection of the winding 12 can be prevented by setting the horizontal dimension δ1 to 0.2 mm or less and the vertical dimension δ2 to 0.3 mm or less. Moreover, as a result of preparing a plurality of samples having different outer dimensions of the wire-wound coil component 10 and conducting an experiment similar to the above-described experiment for each sample, the outer dimensions are 5.0 mm in length × 4.5 mm in width to 3. Results similar to those shown in FIGS. 2A and 2B were obtained in a range of 2 mm × 2.5 mm in width.

  Accordingly, by setting the horizontal dimension δ1 to 0.2 mm or less and the vertical dimension δ2 to 0.3 mm or less, the final of the two windings 12 as shown in FIGS. Even if a dimensional margin is provided in the turn portion, the aerial wiring portion of the winding 12 from the winding core portion 11A to the upper surfaces 11D and 11D of the left and right terminal electrodes is extremely small from the inner side surfaces of the winding core portion 11A and the flange portion 11B. Since only the distance is left, when the moisture-proof coating resin is applied to the winding coil component 10, the winding 12 is securely fixed to the core 11 with the moisture-proof coating resin. It is possible to reliably prevent the winding 12 from being disconnected by being pulled by the expansion / contraction force due to the temperature change of the moisture-proof coating resin in a portion other than the core 11 side by the fixing force of the aerial wiring portion to the core 11 side.

  As described above, according to this embodiment, the core 11 having the core portion 11A and the pair of flange portions 11B formed at both ends thereof, and the two windings 12 wound around the core portion 11A, In the case of the wound-type coil component 10 provided with terminal electrodes respectively connected to both ends of the winding 12 and formed on the flanges 11B, and a top plate 13 installed between the flanges 11B. The protrusion 11C to which the top plate 13 is joined is formed at the center of the end face of each flange 11B, and each terminal electrode is disposed on both sides of the protrusion 11C of each flange 11B. Further, the intersection C1 between the axis of the winding 12 and the inner surface of the flange 11B on each terminal electrode is in the horizontal direction from the intersection C2 of the upper corner of the winding core 11A and the inner surface of the flange 11B. At a distance of 0.2mm or less outward and in the vertical direction Since it is located at a distance of 0.3 mm or less upward, a moisture-proof coating resin is applied to the coiled coil component 10 mounted on the mounting board, and the winding with the moisture-proof coating resin is performed even in an environment where the temperature changes rapidly. The fixing force of 12 to the core 11 side is superior to the expansion and contraction force due to the temperature change of the moisture-proof coating resin, and the disconnection of the winding 12 can be reliably prevented. Further, by setting the outer dimensions of the wound coil component 10 in the range of 5.0 mm in length × 4.5 mm in width to 3.2 mm in length × 2.5 mm in width, the wire 12 of the wound coil component 10 is disconnected. It can be surely prevented.

  FIG. 3 is a view showing another embodiment of the wire-wound coil component of the present invention. As shown in the figure, the winding type coil component 10A is configured in the same manner as in the first embodiment except that both side surfaces of the flange portion 11B are located inside the both side surfaces 11E and 11E of the winding core portion 11A. Has been. Accordingly, in FIG. 3, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals. When both side surfaces of the protruding portion 11C of the flange portion 11B are inside the both side surfaces 11F and 11F of the core portion 11A as in the present embodiment, the axis of the winding 12 on the upper surfaces 11D and 11D of each terminal electrode The intersection C1 between the core and the inner surface of the flange portion 11B is located inwardly in the horizontal direction and upward in the vertical direction from the intersection C2 between the corner portion of the upper surface of the winding core portion 11A and the inner surface of the flange portion 11B. Since it is located at a distance of 0.3 mm or less, the aerial wiring portion of the winding 12 is separated from the inner surface of the core portion 11A and the flange portion 11B of the core 11 by a small distance.

  That is, as long as the both side surfaces 11F and 11F of the winding core portion 11A are inside the protruding portion 11C, the winding end portions 12A and 12B of the winding 12 are on the both side surfaces of the protruding portion 11C on the upper surfaces 11D and 11D of the terminal electrode. You may make it approach. If both side surfaces 11F and 11F of the winding core portion 11A are set as the reference position, the vertical dimension δ2 is the limitation of the above embodiment if both side surfaces of the protruding portion 11C are inside the both side surfaces 11F and 11F of the winding core portion 11A. However, the horizontal dimension δ1 can be increased inward (minus direction) as long as it is limited by both side surfaces of the protrusion 11C. Therefore, also in this embodiment, the same effect as the above-mentioned embodiment can be expected.

  The present invention is not limited to the above-described embodiments, and the design of each component can be appropriately changed as necessary. In each of the above embodiments, the winding end portions 12A and 12B of the winding portion 12 have been described. However, since this is likely to cause an aerial wiring portion at the winding end portions 12A and 12B, only the winding end portion has been described. It goes without saying that the present invention can also be applied to the section. Further, the number of windings is not limited to two, and may be one winding.

  INDUSTRIAL APPLICABILITY The present invention can be used as a winding type coil component for various electronic devices, and can be particularly preferably used as a winding type coil component for a vehicle-mounted substrate.

(A)-(c) is a figure which shows one Embodiment of the winding type | mold coil component of this invention, (a) is sectional drawing which cut | disconnected the winding core part in the direction orthogonal to an axial core, (b) is ( The front view from the upper side of a), (c) is the front view from the horizontal direction of (a). (A), (b) is a graph which shows the relationship between the space | interval (delta) 1 and space | interval (delta) 2 of each wire-wound coil component shown in FIG. 1, and each disconnection rate. It is sectional drawing equivalent to (a) of FIG. 1 which shows other embodiment of the winding type | mold coil component of this invention. It is a perspective view which shows the principal part of the conventional winding type coil components.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Winding type coil components 11 Core 11A Winding core part 11B Saddle part 12 Winding 12A, 12B End of winding C1, C2 Intersection δ1 Horizontal dimension δ2 Vertical dimension

Claims (2)

  A core having a winding core and a pair of flanges formed at both ends thereof, a winding wound around the winding core, and both ends of the winding are connected to each other and formed at each flange. In the wound-type coil component comprising the terminal electrode formed and the top plate laid between the flanges, a protruding portion to which the top plate is joined is formed at the center of the end surface of each flange. And each said terminal electrode is each arrange | positioned at the both sides of the said protrusion part of each said collar part, Moreover, the intersection of the axial center of the said coil | winding on the said each terminal electrode and the said collar inner surface Is located 0.2 mm or less outward in the horizontal direction and 0.3 mm or less upward in the vertical direction from the intersection of the corner portion on the projecting portion side of the core and the inner side surface of the flange portion. Wire-wound coil parts characterized by being positioned.   2. The coiled coil component according to claim 1, wherein the coiled coil component has a size of 5.0 mm in length × 4.5 mm in width to 3.2 mm in length × 2.5 mm in width.

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