JP2005093564A - Chip coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the accuracy of positioning during the bonding between a drum core and an electrode member and positioning, during bonding between the drum core and a flat core, and moreover to improve the productivity. <P>SOLUTION: The chip coil comprises the drum core 10 including an angular flange 22 at both ends of a wound core 20, a plate-type core 12 jointed to connect both flanges, a coil 16, and two electrode members 14 which are loaded to the principal surface of external side of both flanges to connect the ends of coils. At the principal surface of external side of both flanges, a projected portion 24 is formed, extending in the upper and lower direction at the center thereof. A projected portion 30 is also formed on the extending line of the projected portion 24 at both end surfaces of the flat core. The electrode member is set higher than the upper surface of the flange and is also set to a height equal to or smaller than the upper surface of the flat core. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a surface mount type coil component, and more specifically to a chip coil having a structure in which a drum core and a flat core are combined. This chip coil is useful for a common mode filter, for example.

  As a surface mount type coil component used for a common mode filter or the like, there is a structure in which a drum core and a flat core are combined (see, for example, Patent Document 1). This type of chip coil is composed of a drum core having square flange portions at both ends of a horizontally placed core portion, and a flat core joined to the upper surfaces of both flange portions so as to connect between both flange portions of the drum core. And two winding portions provided on the core portion of the drum core, and two electrodes formed on the outer main surfaces of both flange portions for connecting the winding terminals.

  Here, the electrode is obtained by applying a silver paste and baking it at a high temperature, for example. In addition, the structure which forms an electrode by multilayer plating is also developed. Electrical and mechanical connections are made by soldering these electrodes along the winding ends. However, it is not always easy to perform soldering while bringing the winding terminal into contact with the electrode surface.

Therefore, there is an example in which an electrode member obtained by punching and bending a thin metal plate into a predetermined shape is used instead of the electrode having such a film structure. Such an electrode member has such an advantage that it has a low electric resistance and can be easily soldered and connected by winding the winding terminal by projecting the winding connecting portion. However, with the rapid miniaturization of chip parts in recent years, it has become difficult to attach electrode members to jigs and tools, and the assembly workability is poor. The accuracy of taking out has decreased.
JP 2000-133522 A

  The problem to be solved by the present invention is that the positioning accuracy at the time of bonding the drum core and the electrode member and the positioning accuracy at the time of joining the drum core and the flat core are poor and the productivity is low.

  The present invention provides a drum core having square flange portions at both ends of a horizontally placed core portion, a flat core joined to the upper surfaces of both flange portions so as to connect between both flange portions of the drum core, In a surface mount type coil component comprising: a winding portion provided on a core portion of a drum core; and two electrode members that are attached to the outer main surface of both flange portions and connect winding ends. Convex ridges extending in the center vertical direction are formed on the outer main surface of the part, and convex portions are formed on both ends of the flat core on the extension of the ridges, and the electrode member has a flange portion at the upper end. It is set so that it may become the height below the upper surface of a flat core above an upper surface, and the electrode member is isolate | separated by the said protruding item | line and a convex part, It is a chip coil characterized by the above-mentioned.

  A groove in the thickness direction is formed at the center of the upper surface of both flange portions so that the winding terminal is pulled out through the groove and the winding terminal is pulled out through the groove. On the other hand, the electrode member is a metal having a shape in which the upright portion along the ridge and the convex portion, the bottom portion that enters the bottom surface of the flange portion, and the winding connection portion that protrudes laterally outward from the upright portion are integrally formed. It consists of a thin plate, and the drawn-out winding terminal is entangled with the winding connection part and connected by soldering or welding.

  Since the chip coil of the present invention is provided with protrusions on both outer main surfaces of the drum core, positioning of the electrode member during bonding to the drum core is facilitated without using a dedicated jig. Further, by providing the convex portions on both end faces of the flat core, the positioning accuracy at the time of joining the flat core to the drum core using the electrode member is improved. As a result, productivity is significantly improved. Furthermore, since a thin metal plate is used as an electrode, the electrical resistance is low and the characteristics are good, and the degree of freedom in shape design is high, so that it is possible to bind the winding terminal, and that is also the case. Terminal connection workability is improved.

  The chip coil according to the present invention has a drum core having square flange portions at both ends of a horizontal type winding core portion, and a flat plate shape joined to the upper surfaces of both flange portions so as to connect between both flange portions of the drum core. The structure includes a core, winding portions provided on the core portion of the drum core, and two electrode members that are attached to the outer main surfaces of both flange portions and connect winding ends. Convex ridges extending in the central vertical direction are formed on the outer main surfaces of both flange portions, and convex portions are formed on both end surfaces of the flat core on the extension of the ridges. On the other hand, the electrode member has a structure in which the upper end is set to be higher than the upper surface of the flange portion and below the upper surface of the flat core, and the electrode members are separated from each other by the protrusions and the protrusions. The protruding line fulfills the function of positioning when the electrode member is bonded, and the protruding line and the electrode member combine to fulfill the positioning function when joining the flat core.

  FIG. 1 is an exploded perspective view showing an embodiment of a chip coil according to the present invention (however, the winding portion is excluded), and FIG. 2 is a perspective view after assembly. This chip coil has a form in which a drum core 10 and a flat core 12 are combined to form a closed magnetic path, and an electrode member 14 is bonded thereto. A predetermined winding is applied to the drum core 10. The winding portion is denoted by reference numeral 16.

  The drum core 10 has an integral structure including a rectangular parallelepiped core portion 20 and square plate-like flange portions 22 continuous at both ends thereof. On the outer main surface 22a of both flange portions 22, a ridge 24 having a square cross section extending in the central vertical direction is formed over the entire height direction. On the other hand, the flat core 12 has a rectangular plate shape with vertical and horizontal dimensions that matches the axial dimension and flange width of the drum core 10, and a convex portion 30 having the same cross-sectional square shape as the convex stripes 24 is formed at the center of both ends. Has been. Accordingly, the ridges 24 and the projections 30 are connected when the flat core 12 is put on the upper surface of the drum core 10 (the projections 30 are positioned on the extension of the ridges 24). The drum core 10 and the flat core 12 are sintered ferrite products exhibiting predetermined magnetic characteristics.

  The electrode member 14 is formed by punching and bending a thin metal plate into a predetermined shape, and is bent so as to enter the upright portion 40 that is in close contact with the core along the protruding line 24 and the protruding portion 30 and the bottom surface of the flange portion 22. The bottom portion 42 and the winding connection portion 44 projecting laterally outward from a position near the upper end of the upright portion 40 so as to be slightly away from the core surface are continuously integrated. However, the upright portion 40 is set so that its upper end is above the upper surface of the flange portion 22 and below the upper surface of the flat core 12. That is, as shown in FIG. 1, when the height of the upright portion 40 is H, the height of the flange portion 22 is h, and the thickness of the flat core 12 is t, the relationship of h <H ≦ h + t is satisfied. design. For example, the electrode member 14 may be a phosphor bronze thin plate having a thickness of about 0.1 mm that is plated with tin or solder. Two such electrode members 14 are bonded to the outer principal surface 22a of both flange portions 22 with two protrusions 24 therebetween.

  As an assembling procedure, first, each electrode member 14 is bonded to the drum core 10. The upright portion 40 of the electrode member 14 is in close contact with the outer main surface 22a of the flange portion 22 and is in contact with the ridge 24, and is fixed with a thermosetting adhesive. By applying the electrode member 14 to the convex strip 24 of the flange portion 22 from both the left and right sides, positioning in the left-right direction (x direction) can be performed. In positioning in the vertical direction (z direction), the bent bottom portion 42 of the flange portion 22 is positioned. This can be done by contacting the bottom surface. Therefore, even if there is no dedicated jig / tool, it is possible to assemble the drum core itself accurately and easily using the shape of the drum core itself.

  Next, a predetermined winding is applied to the core part 20 of the drum core 10. For example, in the case of a common mode filter, two filaments are wound by bifilar. Then, each winding terminal is entangled with the winding connecting portion 44 of the electrode member 14 and connected and fixed by soldering or welding (for example, arc welding, spot welding, laser welding, etc.). An input end and an output end of one wire are connected to an opposing electrode member at an opposing flange portion, and an input end and an output end of the other wire are connected to an opposing electrode member at an opposing flange portion.

  Then, the flat cores 12 are placed on the upper surfaces of both flange portions 22 so as to connect the both flange portions of the drum core 10 and are joined by an adhesive. At this time, by inserting the convex portion 30 of the flat core 12 between the protruding upper ends of the electrode member 14, the positions in the left-right direction (x direction) and the depth direction (y direction) are uniquely determined. In this way, the flat core 12 can be positioned without using a dedicated jig.

  As described above, in the present invention, the adjacent electrode members 14 are separated from each other by a predetermined distance by the protrusion 24 and the protrusion 30. And the protruding line 24 fulfills the function of positioning when the electrode member 14 is bonded, and the protruding line 24 and the electrode member 14 combine to fulfill the function of positioning when the flat core 12 is joined. become.

  FIG. 3 shows a core of another embodiment of the present invention, in which A is a three-dimensional view of only the drum core, and B is an end face of the drum core and the flat core. The drum core 50 is basically the same as that of the above-described embodiment, and has an integral structure including a rectangular parallelepiped core portion 60 and a substantially square plate-like flange portion 62 continuous at both ends thereof. Convex ridges 64 having a quadrangular cross section extending in the center vertical direction are formed on the outer main surfaces of both flange portions 62. In this embodiment, a groove 66 in the thickness direction is formed at the center of the upper surface of both flange portions 62. The width of the groove 66 is equal to the width of the ridge 64, and thus the height of the ridge 64 extends from the bottom surface of the flange portion 62 to the bottom surface of the groove 64. In this embodiment, the winding terminal is pulled out through the groove 66 and connected to the electrode member. The upper edge of the groove 66 is rounded or chamfered so that the coating of the wire rod is not damaged during the drawing.

  The shape and position of the groove are arbitrary, and the winding terminal can be pulled out from the side without necessarily being provided as shown in FIGS. However, as shown in FIG. 3, if the groove is formed in the center of the upper surface of both flange portions in the thickness direction, the winding terminal pulled out through the central groove is drawn to the left and right to be entangled with the winding connection portion. Easy to tie and maintain its state.

1 is an exploded perspective view showing an embodiment of a chip coil according to the present invention. FIG. Explanatory drawing which shows the other example of the core used by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Drum core 12 Flat core 14 Electrode member 16 Winding part 20 Winding part 22 Flange part 24 Projection 30 Projection

Claims (2)

A drum core having square flanges at both ends of a horizontally placed core, a flat core joined to the upper surfaces of both flanges so as to connect between both flanges of the drum core, and the core of the drum core In a surface mount type coil component comprising two winding portions provided on the outer surface and two electrode members that are attached to the outer main surfaces of both flange portions and connect the winding terminals, the outer main surfaces of both flange portions The surface is formed with ridges extending in the center vertical direction, the both ends of the flat core are formed with protrusions on the extension of the ridges, and the electrode member has an upper end above the upper surface of the flange portion. A chip coil which is set to have a height equal to or lower than the upper surface of the flat core, and electrode members are separated from each other by the protrusions and the protrusions. A groove in the thickness direction is formed at the center of the upper surface of both flange portions so that the winding terminal can be drawn out through the groove. On the other hand, the electrode member has an upright portion along the ridge and the convex portion, and a bottom surface of the flange portion. It consists of a thin metal plate with a shape where the bottom part that enters and the winding connection part that protrudes laterally outward from the upright part are integrally integrated, and the winding terminal pulled out through the groove is tangled to the winding connection part and soldered. The chip coil according to claim 1, which is connected by attaching or welding.

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