JP2016162802A - Surface-mounted inductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface-mounted inductor which enhances accuracy in a relative position between a drum type core and a ring type core while shortening the processing time and has less failure during mass production.SOLUTION: A surface-mounted inductor comprises: a drum type core 20 having a flange at both ends of a winding shaft; a ring type core 30 having a hole in which the drum type core 20 is housed; and a pair of metal terminals 40 bent in a U shape, which is arranged at a position facing the side surface of the ring type core 30. The metal terminals 40 have a plurality of claw parts which are arranged at both ends while being separated from each other. The claw part is bent along the inner wall of the hole and inserted between the inner wall of the hole of the drum type core 20 and the outer periphery of the flange of the ring type core 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an inductor including a drum core and a ring core that houses the drum core.

  An inductor having a closed magnetic circuit structure in which a wound drum core is housed in a hole of a ring core is used for a choke coil such as a DC / DC converter. In such an inductor, in order to increase the value of the DC superimposed current, a gap of about several hundred μm is provided between the drum-type core and the ring-type core so that magnetic saturation is difficult.

JP 2013-243192 A

  In the above-described inductor, the position of the drum core and the ring core is fixed by an adhesive or the like, but the accuracy of the relative position of the drum core and the ring core during mass production, while shortening the process work time, It is difficult to increase, and the gap spacing varies.

Generally, when the gap interval is small, the inductance value of the inductor increases and the direct current superimposition characteristic decreases. For this reason, the product specifications are underestimated in consideration of variations.
However, this variation is large, and when the outer periphery of the heel contacts the inner wall of the hole of the ring core, the inductance value increases remarkably and the direct current superimposition characteristics also remarkably deteriorate. As a result, the product specifications greatly deviated, causing defects.

The surface mount inductor of the present invention is
A drum core having ridges at both ends of the winding shaft;
A ring core having a hole for accommodating the drum core;
It consists of a pair of metal terminals bent in a U-shape arranged at opposite positions on the side surface of the ring-shaped core,
The metal terminal has a plurality of claw portions arranged at both ends,
The claw portion is bent along the inner wall of the hole,
It is inserted between the inner wall of the hole of the drum type core and the outer periphery of the collar of the ring type core.

  According to the present invention, it is possible to provide a surface mount inductor with few defects during mass production.

It is a perspective view of the surface mount inductor of the present invention. It is a disassembled perspective view of the surface mount inductor of this invention. It is a longitudinal cross-sectional view of the surface mount inductor of this invention.

Hereinafter, an embodiment of a surface mount inductor according to the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of a surface mount inductor according to the present invention, and FIG. 2 is an exploded perspective view. In the figure, the direction of the opposite side surface where the metal terminal is disposed is the x-axis direction, the direction of the opposite side surface orthogonal to the x-axis direction is the y-axis direction, and the height direction is the z-axis direction.

As shown in FIGS. 1 and 2, the surface mount inductor 10 includes a drum core 20 having flanges 22, 22 at both ends of a winding shaft 21, and
A winding 50 wound around the winding shaft 21 of the drum core 20;
A ring-shaped core 30 having a square shape with chamfered corners in plan view and provided with holes 31 penetrating the upper and lower end surfaces for housing the drum-shaped core 20;
The metal plate is formed of a pair of metal terminals 40, 40 which are bent in a U-shaped cross section and arranged on opposite side surfaces of the ring core 30.

  The metal terminal 40 is provided with two claw portions 41, 41 spaced from each other at both ends, and is fitted into the side surface of the ring-type core 30. And the nail | claw part 41 is bent along the inner wall of the hole 31, and the nail | claw part 41 is pinched | interposed into the space | gap 11 between a drum type core and a ring type core.

In the ring core 30,
When the side surface on which the metal terminals are opposed is a side surface 32a, and the side surface adjacent to the side surface 32a is 32b,
End surfaces 33a, 33a extending from the side surfaces 32a, 32a;
End surfaces 33b and 33b extending from the side surfaces 32b and 32b and having a lower height than the end surfaces 33a and 33a are provided on the upper and lower end surfaces, respectively, and a step 34 is provided between the end surfaces 33a and 33b. Yes.

  The terminals 51 and 51 of the winding 50 are electrically connected by soldering or the like to the metal terminals 40 and 40, respectively.

The height of the side surface 32a and the side surface 32b of the ring core 30 is different, the height T _32a of the side surface 32a is substantially the same as the height T ₂₀ of the drum core, and the height of the side surface 32b is the winding of the drum core 20. the length of the shaft is shorter than _{T 21.}

  3 is a cross-sectional view of the surface-mount inductor 10, FIG. 3A is a vertical cross-sectional view taken along line AA in FIG. 1, and FIG. 3B is a cross-sectional view taken along line BB in FIG. It is the longitudinal cross-sectional view shown.

As shown in FIG. 3A and FIG. 3B, the surface mount inductor 10 has a drum core with respect to the displacement in the x-axis direction because the claw portion 41 is sandwiched in the gap 11 in the x-axis direction. 20 and the ring-type core 30 do not contact each other, and the y-axis direction is lower than the flange surface at the end of the side surface of the ring-type core. The mold core 30 does not come into contact.
As a result, even if the relative positions of the drum core and ring core are shifted, a surface mount inductor that does not contact the drum core and ring core can be obtained. A mounted inductor can be provided.

In addition, since a plurality of claw portions are arranged apart from each other, even if the relative position of the drum core and the ring core is shifted in the y-axis direction, the shift of the x-axis method can be stably suppressed. .
Further, if the area of the end face 33b is small, there is a possibility of contact when the drum core 20 and the ring core 30 are greatly displaced. Therefore, it is desirable that the end face 33a has as large an area as possible.

DESCRIPTION OF SYMBOLS 10 Surface mount inductor 11 Space | gap 20 Drum type core 21 Winding shaft 22 鍔 30 Ring type core 31 Hole 32a, 32b Side surface 33a, 33b End surface 34 Step 40 Metal terminal 41 Claw part 50 Winding 51 End

Claims (2)

A drum core having ridges at both ends of the winding shaft;
A ring core having a hole for accommodating the drum core;
It consists of a pair of metal terminals bent in a U-shape arranged at opposite positions on the side surface of the ring-shaped core,
The metal terminal has a plurality of claw portions arranged at both ends,
The claw portion is bent along the inner wall of the hole,
A surface mount inductor, wherein the surface mount inductor is inserted between an inner wall of a hole of the drum type core and an outer periphery of a flange of the ring type core. The ring-shaped core has a substantially square shape in plan view,
2. The surface according to claim 1, wherein both upper and lower end surfaces extending from a side surface adjacent to the metal terminal of the ring core and an adjacent side surface are lower than the opposite flange surfaces of the drum core. Mounting inductor.

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