JP4696884B2 - Wire wound electronic component and method of manufacturing the same - Google Patents

Description

  The present invention relates to a wound electronic component and a manufacturing method thereof, and more particularly to a wound electronic component capable of reducing the size and height of a wound electronic component and a manufacturing method thereof.

  For example, as shown in FIG. 5A, a conventional wound electronic component includes a core 1, a wire 2 wound around a core portion 1A of the core 1, and one of the cores 1 (upper in FIG. 5). A pair of terminal electrodes 3A, 3B provided on the end face of the flange portion 1B, and both ends 2A, 2B of the wire 2 are electrically connected to the pair of terminal electrodes 3A, 3B of the flange portion 1B, respectively. Yes. In the case of this winding type electronic component, since the terminal electrode 3 is provided on the end surface orthogonal to the axis of the winding core portion 1A of the flange portion 1B, the winding type electronic component is mounted on a mounting board such as a mother board. In this case, the terminal electrodes 3A and 3B are electrically connected to the surface electrodes formed on the mounting surface.

  Now, in the manufacturing process of the wire wound electronic component, there is a terminal processing process for electrically connecting both end portions 2A, 2B of the wire 2 to the terminal electrodes 3A, 3B. When this terminal processing is performed, for example, as proposed by the present applicants in Patent Documents 1 and 2, the flange portion 1B provided with the terminal electrodes 3A and 3B is disposed upward, and (a) of FIG. ), The two end portions 2A and 2B of the wire 2 folded from the core portion 11A of the core 11 using the thermocompression bonding means 5 such as a heater chip are applied to the terminal electrodes 3A and 3B with a predetermined pressure as indicated by arrows. The both ends 2A and 2B of the wire 2 are simultaneously thermocompression bonded to the terminal electrodes 3A and 3B, respectively, and the both ends 2A and 2B and the terminal electrodes 3A and 3B are electrically connected.

JP 02-271605 JP 05-291047

  However, in the conventional wire-wound electronic component, the flange portion 1B of the core 1 becomes thinner and thinner as the size and height are reduced, and both ends of the wire 12 are wound as shown in FIG. Since it is arranged outside 1A, in the terminal processing described in Patent Documents 1 and 2, the pressing force at the time of thermocompression acts on the flange portion 1B outside the core portion 1A as indicated by an arrow in FIG. Defects are likely to occur in the buttocks 1B. If the pressing force is lowered to prevent the chipping, the both end portions 2A and 2B are not sufficiently crushed, the connection between the both end portions 2A and 2B of the wire 2 and the terminal electrodes 3A and 3B is not sufficient, and the connection reliability is lowered. There is a fear. Further, if the flange portion 1B is made thick in order to prevent the chipping, it is difficult to reduce the size and height of the wound electronic component.

  The present invention has been made in order to solve the above-described problems, and even if the core part of the core is thinned by downsizing and low profile of the wire wound electronic component, the wire end processing is surely performed without damaging the part of the core. It is an object of the present invention to provide a wound electronic component and a method for manufacturing the same, which can be performed in a simple manner and can improve reliability and yield.

According to a first aspect of the present invention, there is provided a wound electronic component manufacturing method comprising: a core having a core portion and a pair of flanges formed at both ends thereof; and an insulating film wound around the core portion of the core. And a pair of terminal electrodes provided on one end face of each of the end faces orthogonal to the axis of the core part of the pair of flange parts, and wound around the core part. both ends of the wire in each connected winding method for manufacturing a wound electronic part in the pair of terminal electrodes have, both ends of the wire, and at least above the said core portion in the one end face the and wherein the step of spaced respectively on a pair of terminal electrodes, a step of connecting each of the pair of terminal electrodes to press the both end portions of the wire in the one end face either further comprising a To do.

According to a second aspect of the present invention, there is provided a wound electronic component including a core having a core part and a pair of flanges formed at both ends thereof, and an insulating film wound around the core part of the core. And a pair of terminal electrodes provided on one end face of each of the end faces orthogonal to the axis of the core part of the pair of flange parts, and wound around the core part. In the wound electronic component in which both ends of the wire are respectively connected to the pair of terminal electrodes, the both ends of the wire are at least above the core portion on the one end surface and the pair of terminal electrodes. Are connected to each other at a distance from each other.

  According to the first and second aspects of the present invention, the wire end processing is performed without damaging the collar part even if the core collar part becomes thin due to downsizing and low profile of the wound electronic component. Thus, it is possible to provide a wound electronic component and a method of manufacturing the same that can reliably perform the above-described process and improve the reliability and the yield.

  Hereinafter, the present invention will be described based on the embodiment shown in FIGS.

  As shown in FIG. 1, for example, the wound electronic component 10 of the present embodiment is wound around a core 11 having a core 11A and a pair of flanges 11B formed at both ends thereof, and the core 11A. A wire 12 and a pair of terminal electrodes 13A and 13B provided on one end face (upward in FIG. 1) orthogonal to the axis of the winding core portion 11A of the flange portion 11B are provided. Both end portions 12A and 12B of the wire 12 are respectively folded back from the core portion 11A to the upper flange portion 11B side, and arranged so as to extend in parallel to the terminal electrodes 13A and 13B.

  The core 11 is made of an insulating material such as ferrite or alumina. The terminal electrodes 13A and 13B formed on the flange portion 11B of the core 11 are, for example, a base electrode made of Ag, Cr—Cu alloy, Cr—Ni alloy or the like and an external electrode made of Sn, Sn—Pb alloy or the like. It is formed as a layer structure. An intermediate layer made of Ni, Cu or the like may be interposed between the base electrode of the terminal electrodes 13A and 13B and the external electrode. An insulating film such as polyurethane is applied to the surface of the wire 12 connected to each of the terminal electrodes 13A and 13B, and is usually wound around a plurality of layers of the core portion 11A of the core 11. Both end portions 12A and 12B of the wire 12 are thermocompression bonded to the terminal electrodes 13A and 13B, respectively, and welded to the external electrodes.

  Thus, in the present embodiment, as shown in FIGS. 1A and 1B, the both end portions 12A and 12B of the wire 12 are crushed by thermocompression bonding to have wide flat portions 12A ′ and 12B ′. Formed on the flange portion 11B on the core portion 11A of the core 11, the insulating film is removed. These flat portions 12A'12B 'have their axial centers disposed above the core portion 11A of the core 11, as shown in FIG. The shaft core of the flat portion 12A′12B ′ is disposed above the core portion 11A and thermocompression bonded to the respective terminal electrodes 13A and 13B, so that the pressing force at the time of thermocompression is applied to the wire 12 above the core portion 11A. Since it acts on the terminal electrodes 13A and 13B formed on the flange portion 11B from both end portions 12A and 12B, the pressing force does not act on the flange portion 11B, and damage to the flange portion 11B can be prevented. The pressing force at the time of pressure bonding can be increased. By increasing the pressing force, even if a thicker wire is used than before, the flange portion 11B is not damaged, terminal processing can be performed, and the degree of freedom in designing the inductance value as the wound electronic component 10 is increased. Can do. As a result, the wire diameter of the wire 12 is conventionally limited to about 120 μm, but in the present embodiment, for example, a wire of 150 μm can be used.

  Next, a method for manufacturing a wound electronic component according to the present invention will be described with reference to FIGS. In the manufacturing method of the present invention, after the wire 12 is wound around the core portion 11A of the core 11 as in the conventional case, the distance between the both end portions 12A and 12B is as shown in FIGS. 2 (a) and 2 (b). Folded from the core portion 11A to the terminal electrodes 13A and 13B formed on the flange portion 11B so as to be narrower than the width of the core portion 11A, the shaft cores of both ends 12A and 12B are connected to the core 11 as shown in FIG. The upper core portion 11A is arranged to be biased inward from the flange portion 11B. At this time, the terminal electrodes 13A and 13B are formed at intervals that do not short-circuit each other.

  With both end portions 12A and 12B of the wire 12 arranged as described above, both end portions 12A and 12B of the wire 12 are formed by using thermocompression bonding means 15 such as a heater chip as shown by arrows in FIG. Press while heating. At this time, since both end portions 12A and 12B of the wire 12 are in line contact with the terminal electrodes 13A and 13B inside the winding core portion 11A shown by a one-dot chain line in FIG. The pressure acts from the line contact portion to the core portion 11A as indicated by arrows in FIG. With this pressing force, both end portions 12A and 12B are crushed and thermocompression bonded to the terminal electrodes 13A and 13B as flat portions 12A 'and 12B'. At this time, since the pressing force does not act on the flange portion 11B, even if both end portions 12A and 12B are crushed with a larger pressing force than before, the flat portions 12A ′ and 12B ′ are not damaged without losing the flange portion 11B. The terminal electrodes 13A and 13B can be reliably connected to the external electrodes. The ends 12A and 12B of the wire 12 may be in a state in which the shaft core is disposed at least inside the extension of both side surfaces of the core portion 11A. As a result, the outer sides of the flat portions 12A ′ and 12B ′ may protrude toward the flange portion 11B.

  As described above, according to the present embodiment, the core 11 having the core portion 11A and the flange portions 11B formed at both ends thereof, and the wire 12 with the insulating coating wound around the core portion 11A of the core 11. And terminal electrodes 13A and 13B provided on end faces orthogonal to the axis of the core part 11A of the flange part 11B, and both end parts 12A and 12B of the wire 12 wound around the core part 11A are terminals. When manufacturing the wound electronic component 10 connected to the electrodes 13A and 13B, respectively, after disposing both end portions 12A and 12B of the wire 12 above the core portion 11A and on the terminal electrodes 13A and 13B, respectively. Since these end portions 12A and 12B are pressed and connected to the respective terminal electrodes 13A and 13B, even if both end portions 12A and 12B on the core portion 11A are crushed by the pressing force of the thermocompression bonding means 15, A pressing force does not act on the flange portion 11B from the end portions 12A and 12B, and no defects are generated in the flange portion 11B, and the flat electrodes 12A ′ and 12B ′ can be reliably connected to the terminal electrodes 13A and 13B. it can.

  Therefore, according to the present embodiment, even if the wound electronic component 10, that is, the core 11, is reduced in size and height and the flange portion 11B is thinned, both end portions of the wire 12 are not caused without causing defects in the flange portion 11B. By connecting 12A and 12B to the respective terminal electrodes 13A and 13B, the highly reliable wound electronic component 10 can be manufactured with a high yield. Further, according to the present embodiment, since the pressing force of the thermocompression bonding means 15 can be increased as compared with the conventional case, it is possible to perform the terminal processing using the wire 12 that is thicker than the conventional one, and the inductance of the wound electronic component 10 The degree of freedom in design of the value can be increased.

  In the above embodiment, the description has been given of the case where both end portions 12A and 12B of the wire 12 are arranged in parallel with each other at the respective terminal electrodes 13A and 13B. There is a possibility that a short circuit may occur due to a narrow interval. Therefore, for example, as shown in FIG. 4, terminal electrodes 13A ′ and 13B ′ formed in an L shape are arranged so as to be point-symmetrical on the end face of the flange portion 11B, thereby short-circuiting between the terminal electrodes 13A ′ and 13B ′. An interval can be provided. On the other hand, the starting end portion 12A of the wire 12 is set long and the terminal end portion 12B is set short, and both end portions 12A and 12B are arranged on the terminal electrodes 13A and 13B so as to gradually approach from the respective folded portions toward the tip end. . The left starting end portion 12A is folded back from the left side surface of the flange portion 11B to the upper surface of the flange portion 11B so as to incline toward the right terminal electrode 13B ′, and overlaps with the protruding portion of the left terminal electrode 13A ′. The right terminal portion 12B is folded from the right side surface of the flange portion 11B to the upper surface of the flange portion 11B so as to incline toward the left terminal electrode 13A ′, and the protruding portion of the right terminal electrode 13B ′ is connected. And is connected as a flat portion 12B ″. By adopting such a connection structure, it is possible to prevent a short circuit between the terminal electrodes 13A 'and 13B'. The shape of the terminal electrode is not limited to the L shape, and may be formed in a trapezoidal shape opposite to each other. In any of these cases, it is needless to say that both end portions 12A and 12B of the wire 12 are disposed on the core portion 11A of the core 11. Also in this embodiment, the same effect as the said embodiment can be expected.

  The present invention is not limited to the above embodiments. In short, a core having a core part and flanges formed at both ends thereof, a wire with an insulating coating wound around the core part of the core, and an axis of the core part of the core part, Terminal electrodes provided on orthogonal end faces, and both ends of the wire when the wound type electronic component in which both ends of the wire wound around the core are connected to the terminal electrodes are manufactured. If it is a wound type electronic component manufactured by connecting a portion to the terminal electrode by pressing the both end portions at least above the winding core portion and on each terminal electrode, respectively, it is included in the present invention. The

  INDUSTRIAL APPLICABILITY The present invention can be suitably used when manufacturing a wound electronic component used for an electronic device or a communication device.

(A), (b) is a figure which shows one Embodiment of the winding type | mold electronic component of this invention, respectively, (a) is the perspective view, (b) is the principal part sectional drawing. (A), (b) is a process figure which thermocompression-bonds a wire by one Embodiment of the manufacturing method of the winding type | mold electronic component of this invention, respectively (a) is a perspective view just before crimping, (b) is the principal part It is sectional drawing. It is explanatory drawing explaining the pressing force which acts on a core from the thermocompression-bonding means in the manufacturing method of the winding type electronic component shown in FIG. It is a top view which shows the principal part of other embodiment of the winding type | mold electronic component of this invention. (A), (b) is a process drawing of thermocompression bonding of a wire by a conventional method of manufacturing a wound electronic component, (a) is a perspective view immediately before crimping, and (b) is a pressing force applied to the wire when crimping. FIG.

Explanation of symbols

11 core 11A core part 11B collar part 12 wire 12A, 12B end part 12A ', 12B', 12A "12B" flat part 13A, 13B, 13A ', 13B' terminal electrode 15 thermocompression bonding means

Claims (2)

A core having a core portion and a pair of flange portions formed at both ends thereof, a wire with an insulating film wound around the core portion of the core, and an axis of the core portion of the pair of flange portions When a pair of terminal electrodes provided on one end face either end surface orthogonal respectively, comprising a winding both ends of the wire wound on the winding core are connected respectively to the pair of terminal electrodes the method of manufacturing a wound electronic component, placing both ends of the wire, each spaced apart from at least and the pair of the terminal electrodes above the winding core portion in the one end face, the one And a step of pressing both end portions of the wire on one end face to connect to the pair of terminal electrodes, respectively . A core having a core portion and a pair of flange portions formed at both ends thereof, a wire with an insulating film wound around the core portion of the core, and an axis of the core portion of the pair of flange portions When a pair of terminal electrodes provided on one end face either end surface orthogonal respectively, comprising a winding both ends of the wire wound on the winding core are connected respectively to the pair of terminal electrodes In the linear electronic component, both ends of the wire are connected to at least one of the end faces above the core part and to the pair of terminal electrodes, respectively. parts.

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