JP2014207415A - Coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil component capable of automatizing miniaturization and surface mount by a simple structure, capable of being easily manufactured, and capable of reducing a cost.SOLUTION: A coil component includes: a ring-opening cylindrical coil 1 that has a conductive metal plate bent in an out-of-plane direction; a flat plate-like mounting terminal 2 that is formed by bending both ends of the coil 1; a bobbin 3 that is made of an insulating resin integrally molded on an outer surface of the coil 1 except for a mounting surface 2a of the mounting terminal 2; and a core that is inserted into the bobbin 3.

Description

  The present invention relates to a coil component such as a choke coil or a transformer that is surface-mounted on a circuit board.

As a conventional coil component, as shown in FIG. 9, one in which a coil 21 is formed by winding a wire with an insulating coating around the outer periphery of a cylindrical core 20 is known.
When such a coil component is mounted on a circuit board, the end portions 21a and 21b of the wire drawn from the coil 21 are inserted into through holes formed in the circuit board and soldered. Is adopted.

  On the other hand, when the coil component is surface-mounted on the substrate due to the recent demand for a low-profile circuit board, a coil is formed by winding a wire around a bobbin, for example, as shown in Patent Document 1 below. In addition, a configuration is often employed in which a mounting terminal for surface mounting is provided on the bobbin and the mounting terminal is connected to the end of the coil.

  However, any of the conventional coil components described above has a problem that, when trying to reduce the size, the core 20 is also reduced in diameter, so that the winding work of the coil 21 requires skill. In addition, in the latter structure in which the mounting terminals are provided, it is necessary to secure a space for disposing the mounting terminals on the bobbin, which makes it difficult to reduce the size itself.

  In addition, especially in the case of surface mount coil parts with mounting terminals, the number of parts is increased, and more labor is required to join the coil ends to the mounting terminals. In addition, the number of joints increases, which may lead to a decrease in manufacturing yield.

JP 2009-004653 A

  The present invention has been made in view of the above circumstances, and is a coil component that can be miniaturized and automated surface mounting with a simple structure, can be easily manufactured, and can be reduced in cost. It is a problem to provide.

  In order to solve the above problems, a coil component according to the present invention described in claim 1 includes an open cylindrical coil in which a conductive metal plate is bent in an out-of-plane direction, and both ends of the coil are bent. It comprises a formed flat mounting terminal, a bobbin made of insulating resin integrally formed on the outer surface of the coil except for the mounting surface of the mounting terminal, and a core inserted into the bobbin. It is what.

  The coil component according to the second aspect of the present invention includes a coil formed by bending so that a plurality of conductive metal wires arranged in parallel form a ring-opened cylindrical shape as a whole, A mounting terminal formed by bending both ends, a bobbin made of an insulating resin integrally formed on the outer surface of the coil except for the mounting surface of the mounting terminal, and a core inserted into the bobbin. It is characterized by this.

  Furthermore, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the mounting terminals at both ends of the coil are located outwardly of the coil and on the same plane. In this way, it is bent.

  According to the invention of any one of claims 1 to 3, since the coil and the mounting terminal are integrally formed by bending the metal plate or the metal wire, and this coil is embedded in the bobbin by integral molding, The winding work of the wire rod around the bobbin is not required as in the prior art, and therefore it is possible to easily cope with downsizing.

  In addition, there is no work for winding a coil around a bobbin or connecting a coil and a mounting terminal as in the prior art, and coil parts are completed simply by inserting a core into the space of a cylindrical bobbin. Costs required can be reduced.

  Further, according to the invention described in claim 2, since the plurality of conductive metal wires arranged in parallel are bent so as to form a ring-opened cylindrical shape as a whole, the coil is formed. By preparing a pattern that sequentially connects one end of a metal wire and the other end of an adjacent metal wire on the circuit board side, a coil having a plurality of turns can be formed. It can be used as an inductance coil component.

  According to a third aspect of the present invention, if the mounting terminals at both ends of the coil are bent toward the outside of the coil and located on the same plane, the circuit board can be mounted. It is suitable because it can easily cope with automation of surface mounting.

1 is an overall perspective view showing a first embodiment of a coil component of the present invention. It is a front view of FIG. (A) is a perspective view which shows the shape of the coil and mounting terminal in 1st Embodiment, (b) is a perspective view which shows the shape of a bobbin itself temporarily, (c) is a bobbin in a bobbin by insert molding. It is a perspective view which shows the state embedded in. It is a whole perspective view which shows the 2nd Embodiment of this invention. (A) is a perspective view which shows the shape of the coil and mounting terminal in 2nd Embodiment, (b) is a perspective view which shows the shape of a bobbin itself temporarily, (c) is a coil in a bobbin by insert molding. It is a perspective view which shows the state embedded in. The usage example of 2nd Embodiment is shown, (a) is a perspective view which shows the pattern formed in the circuit board side, (b) is a perspective view which shows the connection state of the said pattern and a coil. It is a whole perspective view which shows the modification of the 2nd Embodiment of this invention. It is a perspective view which shows the shape of the coil and mounting terminal in the modification of FIG. It is a perspective view which shows the conventional coil components.

(First embodiment)
1 to 3 show a first embodiment of a coil component according to the present invention.
First, in this coil component, as shown in FIG. 3A, a substantially rectangular copper plate (conductive metal plate) is bent in an out-of-plane direction, whereby the coil 1 having an open rectangular tube shape is formed. ing. More specifically, the coil 1 is formed in a U-shape having a top plate 1a and both side walls 1b by bending the copper plate in the same direction by 90 ° in the out-of-plane direction at predetermined intervals. ing.

  In addition, square plate-like mounting terminals 2 that are bent by 90 ° toward the outside of the coil 1 are integrally formed at both ends of the coil 1. Thereby, the mounting terminals 2 are formed so as to be located on the same plane.

  The coil 1 is embedded in a bobbin 3 having a shape as shown in FIG. That is, when the bobbin 3 having the shape as shown in FIG. 3B is injection-molded, the coil 1 is previously placed in a mold and subjected to insert molding, as shown in FIG. 3C. The bobbin 3 is integrated with the entire surface covered.

  Thereby, the top plate portion 3a covering the top plate 1a of the coil 1, the side wall portion 3b covering the side wall 1b of the coil, and the upper surface of the base end portion of the mounting terminal 2 are connected to the bobbin 3 and the side wall portions 3b are connected to each other. The bottom plate portion 3c is formed in a rectangular tube shape.

  When performing the insert molding, the back surface side (mounting surface) 2a of the mounting terminal 2 is subjected to a masking process or the like so that the resin forming the bobbin 3 does not rotate. Thereby, the metal (copper) surface is exposed to the mounting surface 2a of the mounting terminal.

  As shown in FIGS. 1 and 2, in this coil component, the outer legs 4 a of the pair of E-shaped cores 4 arranged to face the outer periphery of the bobbin 3 are arranged along the outer periphery of the side wall portion 3 b of the bobbin 3. The middle foot is configured by being inserted into a through-shaped through hole defined by the top plate portion 3a, the side wall portion 3b, and the bottom plate portion 3c of the bobbin 3. In the figure, reference numeral 5 denotes a tape for positioning and fixing the pair of E-type cores 4.

  According to the coil component having the above configuration, the substantially square plate-shaped copper plate is bent to integrally form the U-shaped coil 1 and the mounting terminal 2, and the coil 1 is embedded in the bobbin 3 by insert molding. Therefore, it is possible to easily cope with downsizing.

  In addition, the work of winding the coil around the bobbin and the work of connecting the coil and the mounting terminal are eliminated, and the manufacturing is completed only by inserting the middle leg of the E-type core 4 into the through hole of the rectangular bobbin 3. The cost required for this can also be reduced.

  Further, the mounting terminals 2 at both ends of the coil 1 are bent toward the outside of the coil 1 and located on the same plane, and the top plate portion 3a of the bobbin 3 is formed by a flat surface. Therefore, by using the top plate portion 3a as the suction surface, it is possible to easily cope with automation of surface mounting on the circuit board.

(Second Embodiment)
4 to 6 show a second embodiment of the present invention. The same components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof will be simplified.
As shown in FIG. 5, in this coil component, a plurality of (in this embodiment, five) copper wires (conductive metal wires) 6 arranged in parallel form an open tube as a whole. The coil 7 is formed by being bent in this manner.

  That is, in this coil 7 as well, the copper wires 6 arranged in parallel are formed in a U shape by being bent by 90 ° sequentially in a direction perpendicular to the parallel direction at positions spaced apart in the longitudinal direction. Has been.

  Also, the mounting terminals 8 a and 8 b are formed by bending both ends of each copper wire 6 forming the coil 7 by 90 ° outward of the coil 7. Here, among the five copper wires 6 arranged in parallel, the conductive wires 6 at both ends in the parallel direction are formed in a square plate shape at both ends, and the base end portion of the square plate portion is bent. Thus, the mounting terminal 8a has a square plate shape.

  When the bobbin 3 having the shape as shown in FIG. 5 (b) is injection-molded, the coil 7 having the above-described configuration is placed in advance in the mold and insert-molded. As shown in c), the bobbin 3 is integrated with the entire surface covered.

  Further, when the insert molding is performed, a masking process or the like is performed on the back surfaces (mounting surfaces) of the mounting terminals 8a and 8b so that the resin forming the bobbin 3 does not rotate. Thereby, copper is exposed on the mounting surfaces of the mounting terminals 8a and 8b. And as shown in FIG. 4, the coil component of this embodiment is comprised by arrange | positioning a pair of E type core 4 in the outer periphery of the said bobbin 3, and forming a closed magnetic circuit.

  When the coil component having the above-described configuration is used, a conductive pattern 9 as shown in FIG. 6A is formed in advance on the circuit board side. The conductive pattern 9 includes four rectangular portions 9a on which the mounting terminals 8a are placed, a total of six linear portions 9b on which the mounting terminals 8b are placed, and one end of the copper wire 6 in a parallel direction. In order to sequentially connect the other end portions of the adjacent copper wires 6, the rectangular portions 9a and the connection portions 9b formed between the linear portions 9b or the linear portions 9b are formed.

  When a coil component is surface-mounted on the conductive pattern 9, as shown in FIG. 6B, adjacent to one end portion of the copper wire 6 through the rectangular portion 9a, the connection pattern 9c, and the linear portion 9b. The other ends of the copper wires 6 are sequentially connected. The coil 7 can be used as a 5-turn coil by using one rectangular portion 9a of the conductive pattern 9 as an input portion and the other rectangular portion 9a opposite to the diagonal direction as an output portion.

  Therefore, the coil component shown in the present embodiment can provide the same effects as those shown in the first embodiment, and further, on the circuit board side, the copper wire 6 adjacent to one end of the copper wire 6. By producing the pattern 9 for sequentially connecting the other end of the coil 9, the effect that it can be used as a coil component with higher inductance can be obtained.

  In each of the first and second embodiments, only the case where the coils 1 and 7 are formed in a U shape has been described. However, the present invention is not limited to this, and for example, FIG. And as shown in FIG. 8, while making the top part of the five copper wires 10 arrange | positioned in parallel curved in the R shape, it is set as the omega-shaped coil 11, and the middle leg of the E-type core 4 is cylindrical. And may be inserted into the coil 11.

1, 7, 11 Coil 2, 8a, 8b Mounting terminal 2a Mounting surface 3 Bobbin 4 E-type core 8, 10 Copper wire (conductive metal wire)

Claims (3)

  An open cylindrical tube in which a conductive metal plate is bent in the out-of-plane direction, a flat mounting terminal formed by bending both ends of the coil, and the coil except for the mounting surface of the mounting terminal A coil component comprising: a bobbin made of an insulating resin integrally molded on the outer surface of the core; and a core inserted into the bobbin.   A coil formed by bending so that a plurality of conductive metal wires arranged in parallel form a ring-opened cylindrical shape as a whole, a mounting terminal formed by bending both ends of the coil, and the mounting terminal A coil component comprising: a bobbin made of an insulating resin integrally formed on the outer surface of the coil except for the mounting surface; and a core inserted into the bobbin.   3. The coil component according to claim 1, wherein the mounting terminals at both ends of the coil are bent toward the outside of the coil and on the same plane. 4. .

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