JP2013058594A - Surface mounting choke coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface mounting choke coil, having a simple structure, easy to assemble, and compatible with a large current.SOLUTION: A core member 1, in which a rod-shaped core 3 is integrally erected at a surface center part of a polygonal plate-like base part 2, and a coil 4, formed by edgewise winding a flat wire, are provided. The rod-shaped core 3 of the core member is inserted into a center of the coil 4. Both end parts 4a and 4b of the coil 4, which are bent from a side part 2a of the base part 2 to a rear face 10 side, are mounting terminals 5.

Description

  The present invention relates to a surface-mounted choke coil for large current that is surface-mounted on various circuit boards such as a power supply circuit.

In general, a choke coil is incorporated by surface mounting on various substrates such as a power supply circuit and a noise removal circuit.
As a conventional surface mount choke coil of this type, for example, as shown in FIG. 7, a round copper wire 51 is wound around a core portion of a drum core 50 integrated with both flanges 50a and 50b to form a plate-like base plate. An electrode part 53 provided on the side part 52 is joined to the end part of the round copper wire 51.

  By the way, in such a surface mount choke coil, if the diameter of the round copper wire 51 is increased in order to cope with a large current supplied to a power supply circuit or the like of an in-vehicle device or the like, There is a problem that it is difficult to join the electrode part 53, and it is also difficult to meet the demands for downsizing and height reduction.

  Therefore, in Patent Document 1 below, an edgewise coil of a rectangular copper wire is placed on a flange base core having a circular hole, and the flange is integrated with the end of a cylindrical core. There has been proposed a surface mount coil in which the core portion of the flanged core core is inserted into the core, and the tip portion thereof is inserted into the hole portion of the flange base core and fixed with an adhesive.

  This surface mount type coil is obtained by bonding a flanged core core to a flange base core and then pulling out the coil lead portion substantially parallel to one side surface direction of the flange base core and winding it from the bottom surface to the opposite side surface. Further, it is assembled by fixing the end portion by caulking to an electrode fixing notch formed on the upper surface of the flange base core. The electrode portion of the coil is used.

  According to the conventional surface mount type coil having the above-described configuration, since a coil obtained by edgewise winding a rectangular copper wire is used as the coil, the winding efficiency is superior to the copper wire shown in FIG. Since the value is small, there is an advantage that it is possible to cope with a large current, and it is also possible to cope with downsizing and low profile.

JP 2003-347129 A

  However, in the above conventional surface mount type coil, the number of parts is large, and after placing the edgewise coil on the flange base core, the tip of the flanged core core inserted into the coil is connected to the flange base. It is necessary to adhere and fix to the core. In addition, after fixing the flanged core core, the coil lead-out portion is further drawn out substantially parallel to one side surface direction of the flange base core, and wound from the bottom surface to the opposite side surface to be formed on the top surface of the flange base core. It must be fixed by crimping to the electrode fixing notch.

  For this reason, it takes a great deal of time for assembly as a whole, and the flanged core core is fixed to the flange base core by bonding. Therefore, when the coil is bent, the coil and the flanged core core If an excessive force acts due to interference, the flanged core may fall off from the flange base core, and there is a problem that the work requires labor and skill.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a surface mount choke coil for large current that has a simple structure and is easy to assemble.

  In order to solve the above-mentioned problem, a surface mount choke coil according to the present invention described in claim 1 includes a core member in which a bar-shaped core is integrally erected at the center of the surface of a polygonal plate-shaped base, and a rectangular A coil in which a wire is wound edgewise, and a rod-shaped core of the core member is inserted into the central portion of the coil, and both ends of the coil bent from the side portion of the base portion to the back side are provided. It is a mounting terminal.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the core member is formed by integrally forming a base portion and a rod-shaped core by a powder molding method. is there.

  Furthermore, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the mounting terminal of the coil is opened on the back surface side of the base portion on the side portion side and the back surface side. A recess for accommodating is formed.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the mounting terminal is formed on the back side along the same side portion of the base portion. A bonding portion for bonding the base portion to the mounting substrate is provided on the back surface side along the side portion facing the side portion.

  On the other hand, the invention according to claim 5 is the invention according to any one of claims 1 to 3, wherein the mounting terminals are respectively formed on the back side along the opposing side portions of the base portion. In addition, a bonding portion for bonding the base portion to the mounting substrate is provided on the back side of the side portion adjacent to the facing side portion.

  According to the invention described in any one of claims 1 to 5, since a coil in which a flat wire is wound edgewise is used as the coil, it can cope with a large current even if it is small and short. . Moreover, a rod-shaped core integrated in the center of the surface of the polygonal plate-like base is inserted into the coil, and both ends of the coil are bent from the side of the base to the back side. This makes it possible to easily assemble.

  Furthermore, since both ends of the coil bent from the side of the base part to the back side are used as mounting terminals, the end of the coil is easily processed, and the rod-shaped core is integrated with the base part. Therefore, when bending both ends of the coil, there is no possibility that the coil interferes with the rod-shaped core and the rod-shaped core easily falls off the base portion.

Here, as an aspect in which the base portion and the rod-shaped core in the core member are integrated, it is preferable to integrally form by a powder molding method, as in the invention described in claim 2.
Further, as in the invention described in claim 3, if a recess is formed on the back surface side of the base portion so as to open to the side portion side and the back surface side and accommodate the mounting terminal of the coil, the coil The mounting terminals do not protrude excessively from the back side of the base part, and can be stably surface-mounted on the substrate surface.

  By the way, when both ends of the edgewise winding coil are pulled out in the same direction and bent to the back side at the same side portion in the base portion to form a mounting terminal, the base portion Is bonded to the substrate at the side where the mounting terminal is located, and is not connected to the substrate on the side facing the side. For this reason, when the substrate is vibrated, there is a possibility that the opposed side portion of the base portion vibrates greatly with the mounting terminal as a fulcrum.

  In this regard, according to the invention described in claim 4, dummy bonding for bonding the base portion to the mounting substrate on the back surface side along the side portion facing the one side portion where the mounting terminal is formed. Since the portion is provided, the base portion can be firmly fixed on the substrate against vibration.

  Further, when the mounting terminal is formed by pulling out both ends of the edgewise winding coil in the opposite direction of 180 ° and bending it to the back side along the opposite side of the base, the invention according to claim 5. As described above, the same effect can be obtained if a bonding portion for bonding the base portion to the mounting substrate is provided on the back surface side of the side portion adjacent to the side portion where the mounting terminal is formed. it can.

1 is a perspective view showing a first embodiment of the present invention. FIG. 2 shows the shape of the core member of FIG. 1, (a) is a plan view, and (b) is a front view. It is a disassembled perspective view which shows the state at the time of assembling the surface mount choke coil of FIG. It is a perspective view which shows the 2nd Embodiment of this invention. FIG. 5 is a bottom view of FIG. 4. It is a perspective view which shows the 3rd Embodiment of this invention. It is a perspective view which shows the conventional surface mount choke coil.

(First embodiment)
1 to 3 show a first embodiment of a surface mount choke coil according to the present invention, and reference numeral 1 in the figure denotes a core member.
This core member 1 has a cylindrical bar-like core 3 standing upright at the center of a square plate-like base 2 and is a metal having electrical insulation such as ferrite and exhibiting ferromagnetism. The oxide is integrally formed by a powder molding method.

  Reference numeral 4 in the figure denotes a coil in which a flat copper wire is wound edgewise, and the winding start end 4a and the winding end 4b are drawn out in the same direction so as to be parallel to each other. The coil 4 is placed on the base 2 with the rod-shaped core 3 of the core member 1 inserted in the center thereof.

  Then, both end portions 4a and 4b of the coil 4 are bent from the same side portion 2a to the back surface side in the base portion 2, and a rectangular tip portion along the side portion 2a is mounted on the substrate when mounted on the substrate. It is set to 5. Note that the tips 4a and 4b of the coil 4 are subjected to solder processing after the coating is peeled off at least in the mounting terminal 5.

  According to the surface mount choke coil having the above configuration, since the coil 4 in which a flat copper wire is wound edgewise is used, a large current can be dealt with even if it is small and short. Further, a rod-shaped core 3 integrated in the center of the surface of the rectangular plate-like base 2 is inserted into the coil 4, and both ends 4 a and 4 b of the coil 4 are connected to the side 2 a of the base 2. By bending to the back side, it can be assembled easily.

  Moreover, since the tip portion of the coil bent 90 ° from the side portion 2a of the base portion 2 to the back side is used as the mounting terminal 5, the bending processing of the end portions 4a and 4b of the coil 4 is easy. Since the rod-shaped core 3 and the base portion 2 are integrally formed, even if the coil 4 interferes with the rod-shaped core 3 when the both ends 4a and 4b of the coil 4 are bent, the rod-shaped core 3 There is no risk of falling off the base part 2 easily.

(Second Embodiment)
4 and 5 show a second embodiment of the surface mount choke coil according to the present invention, and the same components as those in the first embodiment shown in FIGS. The explanation will be simplified.
In the surface mount choke coil according to the present embodiment, the square is opened to the side 2a side and the back surface 10 side at two positions on the back surface 10 of the base portion 2 of the core member 1 where the mounting terminals 5 are located. The recess 11 is formed. The mounting terminals 5 that are bent are accommodated in the respective recesses 11.

  Further, a rectangular recess 12 is formed on the back surface 10 of the central portion of the side portion 2b facing the side portion 2a of the base portion 2 and opens to the side portion 2b side and the back surface 10 side. And the U-shaped joining part 13 inserted from the side part 2b side is accommodated in the concave part 12. The joint 13 is made of a metal that can be joined to the substrate side by welding or brazing, and is formed to have substantially the same thickness as the coil 4.

(Third embodiment)
FIG. 6 shows a third embodiment of the surface mount choke coil according to the present invention. Similarly, the same components as those shown in FIGS. 1 to 5 are denoted by the same reference numerals.
The surface mount choke coil of the present embodiment is different from the second embodiment in the direction in which the ends 4a and 4b of the coil 4 are pulled out.

  That is, in this choke coil, the winding end portion 4b of the coil 4 is drawn out in a direction opposite to the winding start end portion 4a by 180 °. The four end portions 4 b are similarly bent on the side portion 2 b side of the base portion 2, and are accommodated in a recess 11 formed on the back surface 10.

  Further, the joint portion is connected to the side portion 2c adjacent to the opposite side portions 2a and 2b of the base portion 2 and sandwiching the rod-shaped core 3 between the end portions 4a and 4b. 13 is provided. In addition, this junction part 13 is also accommodated in the recessed part 12 formed in the center part back surface side of the edge part 2c of the base part 2. As shown in FIG.

According to the surface mount choke coil having the above-described configuration shown in the second and third embodiments, the same effect as that shown in the first embodiment can be obtained.
In addition, since the concave portion 11 that accommodates the mounting terminal 5 is formed on the back surface 10 side of the base portion 2, the mounting terminal 5 of the coil 4 protrudes excessively from the back surface 10 side of the base portion 2. And can be stably surface-mounted on the substrate surface.

  Further, in the second embodiment, the mounting terminal 5 is formed on the back surface 10 side along the side 2b facing the side 2a on which the mounting terminal 5 is formed, and in the third embodiment. Since dummy joint portions 13 for joining the base portion 2 to the mounting substrate are provided on the back surface 10 side of the side portions 2c adjacent to the opposing side portions 2a and 2b, the vibration is also based on vibration. The base part 2 can be firmly fixed on the substrate.

DESCRIPTION OF SYMBOLS 1 Core member 2 Base part 2a, 2b, 2c Side part 3 Rod-shaped core 4 Edge-wound coil 4a, 4b End part 5 Mounting terminal 10 Back surface of base part 11, 12 Recessed part 13 Joint part

Claims (5)

  A core member in which a rod-shaped core is integrally erected at the center of the surface of a polygonal plate-shaped base portion, and a coil in which a flat wire is edgewise wound, and a rod-like shape of the core member at the center of the coil A surface-mounted choke coil in which a core is inserted and both end portions of the coil bent from the side portion of the base portion to the back surface side are mounting terminals.   2. The surface mount choke coil according to claim 1, wherein the core member is formed by integrally forming a base portion and a rod-shaped core by a powder molding method.   3. The surface according to claim 1, wherein a recess is formed on the back surface side of the base portion so as to open to the side portion side and the back surface side and accommodate the mounting terminal of the coil. Mounting choke coil.   The mounting terminals are formed on the back surface side along the same side portion of the base portion, and the base portion is bonded to the mounting substrate on the back surface side along the side portion facing the side portion. A surface-mount choke coil according to claim 1, further comprising a joint portion for the purpose.   Each of the mounting terminals is formed on the back surface side along the opposing side portion of the base portion, and the base portion is bonded to the mounting substrate on the back surface side of the side portion adjacent to the opposing side portion. The surface-mount choke coil according to claim 1, further comprising a joint portion for performing the operation.

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