Surface mount coil components

Abstract

Provided is a surface mount coil component (surface mount transformer 1) comprising: a winding wire (3) with a lead portion (3a); an insulating bobbin (2) with a winding shaft portion for the winding wire (3); a plurality of mounting terminals (4) protruding from the bobbin (2); and a plurality of entangling terminals (5 (6, 7)) which are formed from the same member as each of the mounting terminals (4) and which are used to entangle the lead portion (3a) of the winding wire. A plurality of adjacent entangling terminals (6, 7) are bent with respect to the direction of protrusion from the bobbin (2). The lead portion (3a) is entangled on the bent portions of the entangling terminals (5, (6, 7)).

Description

【Technical Field】 【0001】 The present invention relates to a surface mount coil component. 【Background Art】 【0002】 In recent years, with the increase in the switching frequency, miniaturization of the switching transformer has been required. Also, from the viewpoint of ensuring reliability, a structure in which a tying terminal different from the mounting terminal is provided, like the surface mount transformer described in Patent Document 1, is common. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2007-214528 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In the structure of the surface mount transformer described in Patent Document 1, it is necessary to secure an insulation distance according to the required withstand voltage. Considering the automation of the production line, it is necessary to secure a pitch between the tying terminals of about 2 mm so that the nozzle of the automatic winding machine does not interfere. In particular, securing the pitch of the tying terminals has been a problem in miniaturizing the surface mount coil component. 【0005】 The present invention has been made in view of the above problems, and provides a surface mount coil component that can be miniaturized. 【Means for Solving the Problems】 [[ID=*48]] 【0006】 According to the present invention, a surface-mount coil component comprises a winding having a lead portion, an insulating bobbin having a winding shaft portion of the winding, a plurality of mounting terminals protruding from the bobbin along the winding axis direction of the winding shaft portion, and a plurality of entanglement terminals formed of the same material as each mounting terminal for entangling the lead portion of the winding, wherein a plurality of adjacent entanglement terminals protrude along the width direction of the bobbin perpendicular to the winding axis direction, the tip portion of the entanglement terminal exposed from the bobbin is bent with respect to the width direction, and the lead portion is entangled with the bent portion of the entanglement terminal. Furthermore, the multiple adjacent interlocking terminals are bent in different directions, with their tips moving away from each other. A surface-mount coil component is provided, characterized by the following features. [Effects of the Invention] 【0007】 According to the present invention, a surface-mount coil component that can be miniaturized is provided. [Brief explanation of the drawing] 【0008】 [Figure 1] This is a perspective view of the surface mount transformer according to this embodiment. [Figure 2] This is an enlarged view of part II in Figure 1, showing adjacent interlocking terminals. [Figure 3] This is an upper perspective view showing the bobbin. [Figure 4] This is a lower perspective view showing the bobbin. [Modes for carrying out the invention] 【0009】 Embodiments of the present invention will be described below with reference to the drawings. The embodiments described below are merely examples to facilitate understanding of the present invention and do not limit it. In other words, the shape, dimensions, arrangement, etc., of the components described below can be changed or improved without departing from the spirit of the present invention, and of course, equivalents thereof are included in the present invention. Furthermore, the various components of the present invention do not need to be independent entities; it is permissible for multiple components to be composed of a single component, for one component to be formed by dividing it into multiple components, for one component to be part of another component, for a part of one component to overlap with a part of another component, and so on. 【0010】 Furthermore, in all drawings, similar components are denoted by the same reference numerals, and redundant explanations are omitted as appropriate. In this embodiment, the mounting direction is assumed to be downward, and the opposite direction is upward, which does not necessarily coincide with the vertical direction in the direction of gravity. 【0011】 <Overview of surface-mount coil components> First, we will explain the overview of the surface-mount coil component (surface-mount transformer 1), mainly referring to Figures 1 and 2. Figure 1 is a perspective view of the surface-mount transformer 1 according to this embodiment, and Figure 2 is an enlarged view of part II in Figure 1, showing adjacent entanglement terminals 5 (6, 7). Note that in Figure 1 and other diagrams, the lines between the loops of the winding 3 wound around the bobbin 2 are omitted from the illustration. Furthermore, in the following, adjacent interlocking terminals 6 and 7 will be collectively referred to as interlocking terminal 5. 【0012】 The surface-mount coil component (surface-mount transformer 1) comprises a winding 3 having lead portions 3a, an insulating bobbin 2 having a winding shaft portion 2a of the winding 3, a plurality of mounting terminals 4 protruding from the bobbin 2, and a plurality of winding terminals 5 (6, 7) formed of the same material as each mounting terminal 4 for winding lead portions 3a. Multiple adjacent (two in this embodiment) entanglement terminals 6 and 7 are bent in the direction of protrusion from the bobbin 2. The lead portion 3a is wrapped around the bent portion of the entanglement terminals 5 (6 and 7). 【0013】 In this embodiment, a surface-mount transformer 1 will be described as an example of a "surface-mount coil component" according to the present invention. However, the "surface-mounted coil component" is not limited to the surface-mounted transformer 1, and any component having a lead portion 3a wound around at least adjacent winding terminals 5 (6, 7) may be used, such as a coupling inductor or an antenna. In particular, when the winding terminals 5 are adjacent on the same pole side, the adjacent winding terminals 5 may be in contact with each other. 【0014】 In this embodiment, although the description will be given by taking as an example two (a pair) of adjacent winding terminals 6 and 7 provided, three or more may be provided. 【0015】 In this embodiment, the protruding direction of the mounting terminal 4 from the bobbin 2 is the longitudinal direction (X direction) of the surface-mounted transformer 1, whereas the protruding direction of the winding terminal 5 from the bobbin 2 is the short-side direction (Y direction) of the surface-mounted transformer 1. However, the present invention is not limited to such a configuration, and the protruding direction of the winding terminal 5 may be the same as the protruding direction of the mounting terminal 4. According to the above configuration, since the winding terminal 5 is bent with respect to the protruding direction from the bobbin 2, it can contribute to miniaturization of the surface-mounted transformer 1. 【0016】 <Configuration> Next, the configuration of the surface-mounted transformer 1 according to this embodiment will be described with reference to FIGS. 3 and 4 in addition to FIGS. 1 and 2. FIG. 3 is an upper perspective view showing the bobbin 2, and FIG. 4 is a lower perspective view showing the bobbin 2. 【0017】 The surface-mounted transformer 1 according to this embodiment mainly includes a bobbin 2 having a winding shaft portion 2a, a U core (not shown) as a magnetic core placed on the winding shaft portion 2a, a winding 3 wound around the U core and the winding shaft portion 2a, and an I core 9 attached to the winding 3 via a gap sheet 8. 【0018】 [Bobbin] As shown in Figures 3 and 4, the bobbin 2 mainly comprises a flattened winding shaft portion 2a, vertical walls 2b extending upward (+Z direction) and ribs 2k extending downward (-Z direction) from both sides of the winding shaft portion 2a in the longitudinal direction (X direction), and side portions 2c formed on both sides of the bobbin 2 in the longitudinal direction beyond the vertical walls 2b. On each of the long-length side portions 2c, a protruding side portion 2d is formed, which protrudes from a lower position on both sides of the short-length direction (Y direction) of the bobbin 2. 【0019】 On the protruding surface of the binding terminal 5 (6, 7) on the bobbin 2 (the protruding side portion 2d), multiple notched recesses 2e, 2f are formed, into which the bent portions of multiple adjacent binding terminals 6, 7, which will be described later, are fitted. When adjacent notched recesses 2e and 2f among multiple notched recesses 2e and 2f are designated as the first notched recess 2e and the second notched recess 2f, the first notched recess 2e is open on one side (+Z direction) of the extension direction of the bent portion of the entanglement terminals 6 and 7. The second notched recess 2f is open on the other side (-Z direction). The bent portions of adjacent interlocking terminals 6 and 7 are fitted into the first notched recess 2e and the second notched recess 2f, respectively. The tips of the adjacent interlocking terminals 6 and 7 protrude from the open portion of the first notched recess 2e or the second notched recess 2f. 【0020】 Specifically, the notched recess 2e is formed on the upper edge portion of the bobbin 2, and is open upward (+Z direction) and outward in the short-length direction. Similarly, the notched recess 2f is formed on the lower edge of the bobbin 2 and is open downward (-Z direction) and outward in the short-length direction. 【0021】 In at least one of the above cases, if it falls under the "opposite direction," the condition "opposite directions relative to the direction of alignment" is satisfied. In other words, if the alignment direction of a pair of entanglement terminals 5(6,7) is the X direction, and the pair of entanglement terminals 5(6,7) each have a +Z component and a -Z component, then the Y component can be arbitrary (i.e., even if both have a -Y component), and it will fall under the "opposite directions relative to the direction of alignment." 【0022】 Furthermore, even if the direction in which the pair of interlocking terminals 5(6,7) are aligned intersects the X, Y, or Z directions at an angle, it is sufficient that the interlocking terminals 5(6,7) extend in both the + and - directions along any of these orthogonal axes. According to the above configuration, as will be described later, the bent portions of adjacent interlocking terminals 5 that extend in opposite directions relative to the alignment direction can be suitably supported by the notched recesses 2e and 2f. 【0023】 As shown in Figures 3 and 4, a notched recess 2e provided on the inner side in the longitudinal direction has a hole 2g for a tangle terminal 6 through which the tangle terminal 6 passes, and a notched recess 2f provided on the outer side in the longitudinal direction has a hole 2h for a tangle terminal 7 through which the tangle terminal 7 passes. 【0024】 The outer end face of the side portion 2c in the longitudinal direction is provided with mounting terminal holes 2i and 2j through which the mounting terminals 4, described later, pass. The mounting terminal holes 2i and 2j are provided in pairs at each of the four corners of the bobbin 2, aligned in the short-length direction (Y direction). The mounting terminal hole 2i on the inside in the short-length direction communicates with the entanglement terminal hole 2g on the inside in the long-length direction (X direction), and the mounting terminal hole 2j on the outside in the short-length direction communicates with the entanglement terminal hole 2j on the outside in the long-length direction (X direction). 【0025】 As shown in Figure 4, the ribs 2k are formed in a torii-gate shape, protruding downwards on both sides of the winding shaft portion 2a in the longitudinal direction (X direction) on the lower surface of the bobbin 2. Because the ribs 2k protrude below the entanglement terminals 7, which will be described later, the mounting state of the surface mount transformer 1 when it is mounted on a printed circuit board (not shown) is stabilized. 【0026】 [Tangle terminals] The entanglement terminals 5 (entanglement terminals 6 and 7) are used to electrically connect the lead portion 3a, which is the end of the winding 3, by entangling them, and are integrally formed with the mounting terminals 4, which will be described later. The lead portion 3a is wrapped around the entanglement terminal 5, and then joined to the entanglement terminal 5 by welding or soldering. In this embodiment, the lengthwise direction (X direction) dimension of the entanglement terminal 5 is 0.7 mm, and the lengthwise direction (Y direction) dimension is 0.3 mm. In this embodiment, a pair of entanglement terminals 6 and 7 are provided at each of the four corners of the surface-mount transformer 1. In other words, there are two pairs on the primary side (-X direction) and two pairs on the secondary side (+X direction), for a total of eight terminals. However, the configuration is not limited to this, and the number of interlocking terminals 5 can be set arbitrarily. 【0027】 As shown in Figure 2, the multiple adjacent interlocking terminals 6 and 7 have their tips 6a and 7a moving away from each other and are bent in different directions (±Z direction in this embodiment). 【0028】 In this embodiment, the entanglement terminals 6 and 7 are bent in opposite directions (180 degrees different directions) when viewed from the direction of protrusion from the bobbin 2 (view in the Y direction in Figure 2), but the present invention is not limited to this configuration. Specifically, the above-mentioned "mutually different directions" refers to directions that have an inclination of at least 45 degrees or more and 315 degrees or less when viewed in the direction of protrusion of the entanglement terminals 6 and 7, or in a direction perpendicular to the direction of protrusion (X direction view or Z direction view). 【0029】 According to the above configuration, since the entanglement terminals 6 and 7 are bent in different directions such that their respective tips 6a and 7a move away from each other, it is possible to prevent the adjacent entanglement terminal 7 from obstructing the entanglement work on one entanglement terminal 6 by the nozzle of a winding machine (not shown). 【0030】 Furthermore, by bending multiple entanglement terminals 6 and 7 in directions where their tips 6a and 7a move away from each other and in different directions (directions that do not interfere with each other), the pitch between entanglement terminals 6 and 7 (in other words, the distance between the protruding base ends of entanglement terminals 6 and 7 from the bobbin 2) can be narrowed. For example, the interlocking terminals 6 and 7 may protrude from the bobbin 2 at the same position in both the length direction (X direction) and the length direction (Y direction), as long as they are offset in the height direction (Z direction). This configuration makes it possible to narrow the pitch between the interlocking terminals 6 and 7 in either the length direction or the length direction. This allows for miniaturization of the surface-mount transformer 1 itself. 【0031】 Multiple adjacent entanglement terminals 6 and 7 are bent in opposite directions (±Z directions in this embodiment) relative to the direction in which the entanglement terminals 6 and 7 are aligned (X direction in this embodiment). 【0032】 According to the above configuration, the tips of the interlocking terminals 6 and 7 can be moved further apart because they are bent in opposite directions relative to their alignment direction. 【0033】 Multiple adjacent entanglement terminals 6 and 7 protrude from the bobbin 2 at the same height, and the entanglement terminals 6 and 7 are bent in opposite directions. Here, "height" refers to the vertical distance from a virtual mounting surface determined by the tips of three or more mounting terminals 4. Furthermore, "same height" includes not only perfectly matching heights, but also the overlap of the heights of the interlocking terminals 6 and 7 (in other words, the difference in height between the thickness centers of the two interlocking terminals 6 and 7 is less than the thickness dimension of the interlocking terminals). 【0034】 With the above configuration, since the entanglement terminals 6 and 7 protrude at the same height, the thickness of the bobbin 2 (side portion 2c) that holds the base ends of the entanglement terminals 6 and 7 through the entanglement terminal holes 2g and 2h can be reduced. In addition, because the entanglement terminals 6 and 7 are bent in opposite directions, they can be aligned vertically with the side surface of the bobbin 2 (side portion 2c). 【0035】 However, the configuration is not limited to this, and the connecting terminals 6 and 7 may protrude from different height positions on the bobbin 2. 【0036】 In particular, the binding terminal 5 is bent at a 90-degree angle with respect to the direction of protrusion from the bobbin 2 (Y direction). Specifically, the entanglement terminal 6 is bent at +90 degrees relative to the direction of protrusion from the bobbin 2 when viewed in the longitudinal direction (X direction) of the bobbin 2, and the entanglement terminal 7 is bent at -90 degrees relative to the direction of protrusion from the bobbin 2. According to the above configuration, the protrusion of the entanglement terminal 5 from the bobbin 2 in the protruding direction can be suppressed. 【0037】 Of the multiple adjacent entanglement terminals 6 and 7, the central terminal (in this embodiment, the entanglement terminal 6 located on the inside in the longitudinal direction) is bent in the opposite direction (+Z direction) to the mounting direction (-Z direction), while the outer terminal (in this embodiment, the entanglement terminal 7 located on the outside in the longitudinal direction) is bent in the mounting direction (-Z direction). 【0038】 In surface-mount coil components (surface-mount transformer 1), typically, the windings 3 and core (I-core 9) protrude from the center in the opposite direction to the mounting direction (+Z direction), while the mounting terminals 4 protrude outwards in the mounting direction (-Z direction). According to the above configuration, by arranging the entanglement terminal 7 to align with these components (winding 3, I-core 9, and mounting terminal 4), it is possible to contribute to miniaturization of surface-mount coil components. 【0039】 [Mounted terminals] The mounting terminals 4 are for mounting the surface mount transformer 1 to a circuit board (not shown) by soldering, and in this embodiment, there are two pairs on the primary side (-X direction) and two pairs on the secondary side (+X direction), for a total of eight terminals. In this embodiment, at each of the four corners of the surface-mount transformer 1, the mounting terminal 4 on the inside in the short direction is integrally formed with the entanglement terminal 6 on the inside in the long direction, and the mounting terminal 4 on the outside in the short direction is integrally formed with the entanglement terminal 7 on the outside in the long direction. 【0040】 The direction in which mounting terminal 4 protrudes from bobbin 2 (X direction) is perpendicular to the direction in which entanglement terminals 6 and 7 protrude from bobbin 2 (Y direction) in a plan view (Z direction view). This configuration prevents interference between mounting terminal 4 and entanglement terminals 6 and 7 when the winding machine nozzle is used for entanglement. 【0041】 The gap sheet 8 is used to adjust the DC superposition characteristics. The gap sheet 8 is non-magnetic and is positioned between the winding 3 and the I core 9. 【0042】 The above embodiments and modifications encompass the following technical concepts. (1) A winding having a lead portion, An insulating bobbin having the winding shaft portion of the winding, Multiple mounting terminals protruding from the bobbin, Each mounting terminal is formed of the same material as the other, and consists of multiple entanglement terminals that wrap around the lead portion of the winding, A surface-mount coil component equipped with, Multiple adjacent interlocking terminals are bent in the direction of protrusion from the bobbin. The surface-mount coil component is characterized in that the lead portion is wrapped around the bent portion of the wrapping terminal. (2) The surface-mount coil component described in (1), wherein the adjacent entanglement terminals are bent in directions opposite to each other, with their tips moving away from one another. (3) The surface-mount coil component according to (2), wherein a plurality of adjacent interlocking terminals are bent in opposite directions relative to each other, with respect to the direction in which the interlocking terminals are aligned. (4) Multiple adjacent interlocking terminals protrude from the bobbin at the same height. The surface-mount coil component described in (3), wherein the aforementioned interlocking terminals are bent in opposite directions. (5) The protruding surface of the entanglement terminal on the bobbin has multiple notched recesses into which the bent portions of multiple adjacent entanglement terminals are fitted. When, among the plurality of notched recesses, adjacent notched recesses are designated as the first notched recess and the second notched recess, The first notched recess is open on either side of the extending direction of the bent portion of the adjacent interlocking terminal, The second notched recess is open on the other side, and the bent portion of the adjacent interlocking terminal is fitted into the first notched recess and the second notched recess, respectively. A surface-mount coil component according to any one of (1) to (4), wherein the tips of each adjacent interlocking terminal protrude from the first notched recess or the open portion of the second notched recess. (6) The surface-mount coil component according to any one of (1) to (5), wherein the entanglement terminal is bent at a 90-degree angle with respect to the direction of protrusion from the bobbin. (7) A surface-mount coil component according to any one of items (1) to (6), wherein, among a plurality of adjacent interlocking terminals, the central terminal is bent in the opposite direction to the mounting direction, and the outer terminal is bent in the mounting direction. [Explanation of symbols] 【0043】 1. Surface-mount transformer (surface-mount coil component) 2 bobbins 2a Winding shaft part 2b standing wall 2c Side 2d protruding sides 2e Notched recess (first notched recess) 2f Notch recess (second notch recess) 2g, 2h hole for connecting terminal 2i, 2j mounting terminal holes 2k Rib 3 windings 3a Lead section 4. Mounting terminals 5, 6, 7 Interlocking terminals 6a, 7a Tip 8 Gap sheets 9. I-core (plate-shaped magnetic core member)

Claims

[Claim 1] A winding having a lead portion, An insulating bobbin having the winding shaft portion of the winding, Multiple mounting terminals protruding from the bobbin along the winding axis direction of the winding shaft portion, Each mounting terminal is formed of the same material as the other, and consists of multiple entanglement terminals that wrap around the lead portion of the winding, A surface-mount coil component equipped with, Multiple adjacent entanglement terminals protrude along the width direction of the bobbin, which is perpendicular to the winding axis. The tip of the entanglement terminal exposed from the bobbin is bent in the width direction. The lead portion is wrapped around the bent portion of the wrapping terminal, A surface-mount coil component in which multiple adjacent interlocking terminals are bent in different directions, with their tips moving away from each other. [Claim 2] Multiple of the aforementioned entanglement terminals are arranged in the direction of the winding axis and protrude from the bobbin, The surface-mount coil component according to claim 1, wherein the tips of a plurality of adjacent interlocking terminals in the direction of alignment are bent in opposite directions in the vertical direction, and the lead portions are interlocked with the tips that extend in the vertical direction. [Claim 3] Multiple adjacent interlocking terminals protrude from the bobbin at the same height. The surface-mount coil component according to claim 2, wherein the interlocking terminals are bent in opposite directions (up and down). [Claim 4] A winding having a lead portion, An insulating bobbin having the winding shaft portion of the winding, Multiple mounting terminals protruding from the bobbin along the winding axis direction of the winding shaft portion, Each mounting terminal is formed of the same material as the other, and consists of multiple entanglement terminals that wrap around the lead portion of the winding, A surface-mount coil component equipped with, Multiple adjacent entanglement terminals protrude along the width direction of the bobbin, which is perpendicular to the winding axis. The tip of the entanglement terminal exposed from the bobbin is bent in the width direction. The lead portion is wrapped around the bent portion of the wrapping terminal, The protruding surface of the entanglement terminal on the bobbin has multiple notched recesses into which the bent portions of multiple adjacent entanglement terminals are fitted. When, among the plurality of notched recesses, adjacent notched recesses are designated as the first notched recess and the second notched recess, The first notched recess is open on either side of the extending direction of the bent portion of the adjacent interlocking terminal, The second notched recess is open on the other side, and the bent portion of the adjacent interlocking terminal is fitted into the first notched recess and the second notched recess, respectively. A surface-mount coil component in which the tips of each of the adjacent interlocking terminals protrude from the first notched recess or the open portion of the second notched recess. [Claim 5] A winding having a lead portion, An insulating bobbin having the winding shaft portion of the winding, Multiple mounting terminals protruding from the bobbin along the winding axis direction of the winding shaft portion, Each mounting terminal is formed of the same material as the other, and consists of multiple entanglement terminals that wrap around the lead portion of the winding, A surface-mount coil component equipped with, Multiple adjacent entanglement terminals protrude along the width direction of the bobbin, which is perpendicular to the winding axis. The tip of the entanglement terminal exposed from the bobbin is bent in the width direction. The lead portion is wrapped around the bent portion of the wrapping terminal, The aforementioned surface-mount coil component further comprises a core, The core is located on the central side in the winding axis direction and protrudes from the bobbin in the opposite direction to the mounting direction. Multiple of the aforementioned entanglement terminals are arranged in the direction of the winding axis and protrude from the bobbin, A surface-mount coil component in which, among a plurality of adjacent interlocking terminals, the central terminal in the winding axis direction is bent in the opposite direction to the mounting direction, and the outer terminal in the winding axis direction is bent in the mounting direction. [Claim 6] The surface-mount coil component according to any one of claims 1 to 5, wherein the tip of the entanglement terminal is bent 90 degrees with respect to the width direction.

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