JP2007081120A - Inductor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inductor which can be miniaturized and further can improve a coming-off strength of a terminal from a magnetic substance, and can suppress a breakage of the magnetic substance and a generation of a crack which are anxious at the time of bending and processing the terminal. <P>SOLUTION: The inductor is constituted by the steps of connecting leads 3, 13 at both ends of a coil 2 consisting of a conductive material with joints 10, 100 of a terminal 4; embedding a part of the terminal 4 including the joints 10, 100 of the coil 2 and the terminal 4 in a magnetic substance 1; and bending and processing the terminal 4 outwardly projecting from the magnetic substance 1 along the side face of the magnetic substance 1, wherein terminal embedded portions 8, 18 of the terminal 4 embedded in the magnetic substance 1 are divided into two pieces. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention mainly relates to a terminal structure of an inductor used for a power supply portion of an electrical appliance.

  Conventionally, as this type of inductor (inductor element), there is Patent Document 1 or the like. In addition, in a commercially available inductor, a coil is embedded in a molded body (magnetic body) obtained by pressure forming by adding a binder (binder) to magnetic powder, and the lead portion of the coil is made of a metal plate. The electrodes (terminals) are connected by spot welding, crimping, soldering, or the like. As an example, there is a technique described in FIG. 3 and FIG.

  In FIG. 3, the lead portion 3 of the coil 2 embedded in the magnetic body 1 is connected to the terminal 4 with the same width. Further, in FIG. 4, a convex portion 7 provided at a position shifted to the left or right of the lead portion 3 and the wide portion 6 of the terminal 4 in an empty space generated by the corners of the coil 2 and the magnetic body 1 formed into a rectangular shape. And are embedded in the magnetic body 1.

JP 2003-217941 A

  In the above prior art inductor, in the case of the prior art of FIG. 3, the magnetic material 1 is magnetic for securing the terminal pull-out strength so that the terminal 4 is not pulled out, and for the connection between the terminal 4 and the lead portion 3. Since the slanted portion 5 of the magnetic body in which the body 1 is enlarged is necessary, it becomes an obstacle to downsizing of the product. Further, if the width of the terminal 4 is set wide in order to improve the stability of the terminal mounting, cracks and cracks are likely to occur in the magnetic material portion that becomes the bending fulcrum of the terminal 4 when the terminal 4 is bent.

  In the case of the prior art of FIG. 4, the connecting portion between the convex portion 7 of the terminal 4 and the lead portion 3 has a structure that uses a space space generated by the corners of the coil 2 and the magnetic body 1, so that the product shape is small. It can be suppressed. However, since the space is small, the width of the convex portion 7 must be reduced, the strength of the connecting portion between the convex portion 7 embedded in the magnetic body 1 and the lead portion 3 is weak, and the terminal 4 is bent when the terminal 4 is bent. This is a cause of defects such as the inclination of 4.

  Therefore, the present invention enables the downsizing of the inductor, and further improves the terminal pull-out strength from the molded magnetic body, and also causes the occurrence of cracking and cracking of the magnetic body, which is a concern during bending of the terminal. An object is to provide an inductor that can be suppressed.

  In order to solve the above-described problems, the present invention has been made as a result of studying the shape of a buried portion of a terminal used for an inductor.

  That is, according to the present invention, the lead portions at both ends of the coil made of a conductive material are connected to the joint portion of the terminal, and a part of the terminal including the joint portion of the coil and the terminal is embedded in the magnetic body, An inductor formed by bending a terminal protruding outside from a body along a side surface of a magnetic body, wherein the terminal embedded portion of the terminal embedded in the magnetic body is divided into two parts can get.

  According to the present invention, there is obtained an inductor characterized in that the joint portions provided at both ends of the divided terminal buried portion are wider than the base portion of the terminal buried portion.

  In addition, according to the present invention, there can be obtained an inductor characterized in that a notch portion is provided in a central portion of the divided terminal buried portion.

  By using the terminal according to the present invention, it is possible to reduce the size of the product, and further, the strength of terminal disconnection from the molded part is improved, and cracking / cracking of the molded body (magnetic body) that is a concern during bending of the terminal is generated. Is suppressed. Further, by dividing the molded embedded portion into two parts, an inductor capable of stable processing against terminal inclination and bending at the time of terminal bending can be obtained.

  Embodiments of the present invention will be described below.

  FIG. 1 is a transparent external perspective view showing an example of the basic configuration of the inductor of the present invention. 2 is a perspective plan view of the terminal having the basic configuration shown in FIG. 1 before bending.

  The inductor of the present invention will be described with reference to FIGS. 1 and 2, the coil 2 has a cylindrical winding portion 20 in which a flat conductor wire is wound in multiple layers, and lead portions 3 and 13 led out from both ends of the winding portion 20, respectively. The coil 2 is embedded in the magnetic body 1.

  A portion of the terminal 4 is embedded in the magnetic body 1 and press-molded and fixed, and the remaining portion exposed to the outside of the magnetic body 1 is bent along the outer surface of the magnetic body 1. 1 extends from the side surface to the bottom surface. Further, the terminal embedded portions 8 and 18 embedded in the magnetic body 1 of the terminal 4 are divided into two in the magnetic body 1, and a notch portion 9 is provided in the central portion thereof.

  The magnetic body 1 is divided into two parts with a notch 9 provided in the center of the terminal embedded parts 8 and 18 of the terminal 4 as a boundary, and is embedded and held in two parts in the magnetic body 1. When the remaining terminal 4 exposed to the outside after molding is bent from the side surface to the bottom surface along the surface of the magnetic body 1, the terminal inclination and the horizontal inclination are prevented, and the strength is stabilized.

  Further, the lead portions 3 and 13 of the coil 2 are connected to one of the joint portions 10 and 100 of the terminal buried portions 8 and 18 divided into two in the magnetic body 1 by welding or the like. Further, the joint portions 10 and 100 at both ends of the divided terminal buried portions 8 and 18 are wider than the base portions thereof, and are buried and installed in empty spaces generated at the corners of the coil 2 and the magnetic body 1. . Therefore, it does not hinder product miniaturization. Further, since the terminal burying portion 8 is separated from the base portion of the notch portion 9 at two places on the left and right sides, the terminal pull-out strength is improved.

  Further, the terminal burying portions 8 and 18 are divided into two by a notch portion 9 provided in the central portion thereof, so that the remaining terminals 4 exposed to the outside after molding of the magnetic body 1 are formed on the surface of the magnetic body 1. When bending along the terminal, the bending fulcrum of the terminal is divided into two parts, so that the bending and cracking of the bent part of the terminal 4 to the molded part of the magnetic body 1 can be prevented.

  Since the inductor according to the present invention can prevent cracking and cracking of the magnetic material of the terminal portion derived from the magnetic material, it can be suitably applied to an inductor as a power supply component for various electronic devices. It can be applied to inductors used in circuits, etc., and to various next-generation electronic devices.

The perspective appearance perspective view of the inductor concerning an embodiment of the invention. The perspective top view before the bending process of the terminal of the inductor shown in FIG. The perspective top view of the structural example 1 of the conventional inductor. The perspective top view of the structural example 2 of the conventional inductor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic body 2 Coils 3, 13 Lead part 4 Terminal 5 Magnetic shaded part 6 Wide part 7 Protrusion part 8, 18 Terminal embedding part 9 Notch part 10, 100 Joint part 20 Winding part

Claims (3)

  Connect the lead part at both ends of the coil made of a conductive material and the joint part of the terminal, embed a part of the terminal including the coil and terminal joint part inside the magnetic body, and project the terminal protruding outside from the magnetic body An inductor formed by bending along a side surface of a magnetic material, wherein the terminal embedded portion of the terminal embedded in the magnetic material is divided into two parts.   The inductor according to claim 1, wherein the joint portions provided at both ends of the divided terminal embedded portion are wider than the base portion of the terminal embedded portion.   3. The inductor according to claim 1, wherein a notch portion is provided in a central portion of the two-divided terminal buried portion.

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