JP2002118019A - Surface-mounting winding parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide surface-mounting winding parts that can be reduced in cost by reducing the number of used parts and improving the working efficiency, without using special processes. SOLUTION: The surface-mounting winding parts are constituted by joining a magnetic core to a magnetic core holding substrate and winding a relatively thick insulated and sheathed copper wire around the magnetic core; the parts have a plurality of wiring grooves on the facing side faces and projections on the upper surface of the substrate above the wiring grooves; the front end section of each terminal led out from the wiring is passed through the substrate from the upper surface to the lower surface along the wiring groove on one side face, after the insulating coating has been removed from the section; and the section is pre-soldered and passed through the substrate again from the lower surface to the upper surface along the wiring groove on the other side face, after the section has been laid on the lower surface. Then the front end section is brought into contact with one of the projections and locked by bending the section around the projection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic circuit component in an electronic device, and more particularly to a surface mount type winding component suitable for surface mounting.

[0002]

2. Description of the Related Art As shown in FIG. 4, for example, a conventional surface mount type winding component has a toroidal core 42, which is a magnetic material, joined to a substrate 41 on which a plurality of external mounting terminals 40 are embedded. ing. A relatively thick insulating-coated copper wire is wound around the toroidal core 42 as a winding 43. The lead wires 44 of the winding 43 are wrapped around the external terminals 40 and joined by soldering or the like.

[0003] However, the above-mentioned conventional surface mount type winding parts are:
In order to make the external terminal for imposition 40 have a special shape and to lay out the lead wire 44 of the winding 43 using a relatively thick insulating-coated copper wire, in the tying work, the tying part becomes thicker.
Since the tip of the terminal floats or deforms the external terminal, the bottom surface of each external terminal 40 is not uniform, and there is a problem in that the connection with the external circuit board becomes defective. In addition, since the external terminal has a special shape, the cost is increased and the working efficiency is reduced.

Further, a conventional surface mount type winding component as shown in FIG. 5 has printed electrodes 50 or frame electrodes (not shown) formed by insert molding using a frame as a plurality of external terminals for imposition. ) Is provided as an external terminal, and a special process such as welding is required to connect a lead wire of a winding using a relatively thick insulating-coated copper wire to the external terminal.
Such a conventional surface-mounted winding component requires a special process such as a printing electrode, a frame electrode, and welding, resulting in an increase in cost.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing points, and has been made in consideration of the above-described problems. Therefore, the number of parts is reduced, a special process is not used, work efficiency is improved, and cost is reduced. It is an object of the present invention to provide a mounting type winding component.

[0006]

In order to solve the above-mentioned problems, the present invention relates to a surface mount type winding in which a magnetic core is joined to a substrate for holding a magnetic core, and a relatively thick insulating-coated copper wire is wound around the magnetic core. In the wire component, a plurality of wiring grooves are provided on opposing side surfaces, a protrusion is provided on the upper surface of the substrate corresponding to the upper portion of the wiring groove, and the end of each terminal pulled out from the winding is removed with an insulating coating and preliminary solder is removed. The top surface of the substrate is passed along the wiring groove on one side from the upper surface to the lower surface, and the lower surface of the substrate is passed from the lower surface of the substrate along the other wiring groove facing the lower surface. Are bent and locked against the projections.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the surface mount type winding component of the present invention, a magnetic core is joined to a substrate for holding a magnetic core, and a relatively thick insulating-coated copper wire is wound around the magnetic core. The substrate is provided with a plurality of wiring grooves on opposing side surfaces, and projections are provided on the upper surface of the substrate which is located above the wiring grooves. The end of each terminal pulled out from the winding is stripped of the insulating coating, pre-soldered, passed from the upper surface to the lower surface of the substrate along the wiring groove on one side, and further across the substrate along the lower surface to oppose It is passed from the lower surface to the upper surface of the substrate along the other wiring groove, and the leading end is bent and locked against the projection. This makes it possible to prevent the terminal from becoming loose or slipping. In addition, the winding and the external circuit can be connected by a terminal along the lower surface of the substrate serving as an external electrode. Further, by using a wire diameter of the insulating coating body wire of about 80 μm or more, it is optimal as an external terminal and workability.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1A is a perspective view showing a surface-mounted winding component according to one embodiment of the present invention, and FIG. 1B is a bottom view thereof. FIG. 2 is a process chart showing a method for manufacturing the surface-mounted winding component of FIG.

As shown in FIG. 1, in the surface-mounted winding component according to the embodiment of the present invention, 1 is a substrate formed of an insulating resin, 2 is a toroidal core formed of a magnetic material, and 3 is a comparative example. A winding 4 around which a thick insulating-coated copper wire is wound, 4 is a terminal which is a lead of the winding, and 5 is a terminal which is pre-soldered by breaking the insulating coating of the insulating-coated copper wire. The substrate 1 is provided with two wiring grooves 6 on opposing side surfaces, and projections 7 at four corners on the upper surface of the substrate 1.

Next, a method for manufacturing a surface-mounted wound component according to the present invention will be described with reference to FIG. First, an insulated copper wire (80 μm in the embodiment) is attached to the toroidal core 2 bonded to the substrate 1.
m is wound), and the ends of the lead wires 4 of the winding 3 are cut to a predetermined length (FIG. 2A). Next, the coating of the insulating coated copper wire is destroyed by a solder dipping to a predetermined length of the end of the lead wire 4, and at the same time, preliminary soldering is performed (FIG. 2B). Next, the pre-soldered terminal 5 is passed along the wiring groove 6 (a) on the side surface of the substrate 1 from the upper surface of the substrate to the lower surface. It is passed along from the lower surface of the substrate to the upper surface, and is bent and locked along the protrusion 7 on the upper surface of the substrate (FIG. 2C). Finally, the terminal 5 protruding from the side of the substrate is cut along with the side 9 of the substrate 1 (FIG. 2).
(D)).

As described above, by using the terminal of the insulated copper wire used for the winding as an electrode, the number of parts can be reduced because external electrodes such as a special printed electrode and a frame electrode are not required, and the cost can be reduced. Can be down. In addition, the work of drawing the terminal to the board only needs to be made substantially half way around the board, and the work is easy. Furthermore, since it is bent against the protrusion on the upper surface of the substrate through the wiring groove on the side surface of the substrate, it is also stable as an external electrode, and the reliability of the connection of the external substrate circuit can be obtained.

Next, a second embodiment of the surface mount type winding component will be described with reference to FIG. 3 (A) front view and FIG. 3 (B) bottom view.
FIG. 3 has a primary winding 30A and a secondary winding 30B, in which external electrodes 35 are formed at four opposing corners of the bottom surface. Reference numeral 31 denotes a substrate, and 32 denotes a toroidal coil attached to the substrate 31. The substrate 31 is provided with two (eight in total) wiring grooves 33 on two pairs of opposing side surfaces, respectively.
At the four corners of the upper surface of the device, projections 34 for locking each terminal are formed. The two terminals of the primary winding 30A and the two terminals of the secondary winding 30B pass through the wiring groove 33a on the opposite side of the substrate 31 to which the toroidal core 32 is adhered, and are routed along the other side along the bottom surface. After passing through the wiring groove 33b on the matching side surface, the substrate 3
The projection 1 is bent against the projection 34 on the upper surface of the first and locked. In this way, even a winding component requiring a secondary side does not require a special printed electrode or an external electrode using a frame electrode, so that a low-cost electronic component with a small number of components can be obtained. .

As an embodiment of the present invention, the wire diameter of the insulation-coated copper wire is preferably from 80 μm to 400 μm, so that the workability is good and it can be effectively used as an external terminal.

Although the embodiments of the surface mount type winding component of the present invention have been described above, the present invention is not limited to these embodiments.
For example, the core is not limited to a magnetic toroidal core, but may be a drum core or an eyeglass core.The core is not limited to a magnetic material and may be formed integrally with a substrate using a bobbin having a bobbin using resin. good. Furthermore, the shape of the substrate is not limited to a square, but may be various shapes such as a circle or a polygon.

[0015]

As described above, the surface-mounted winding component of the present invention uses a substrate provided with wiring grooves on opposing side surfaces and projections at four corners on the upper surface, and is wound around a core. The use of relatively thick insulation-coated copper wire terminals to form external electrodes eliminates the need for special printed or frame electrodes, making it possible to provide low-cost surface-mounted winding components. Further, since a step of applying an electrode unlike a printed electrode is not required, work efficiency can be improved. In addition, when winding the winding terminal like an external electrode using a frame electrode, various effects such as the occurrence of abnormal products such as floating, bending, etc. due to thickening and deformation of the external electrode are prevented. To play. Furthermore, the structure is simple.

[Brief description of the drawings]

FIG. 1 is a perspective view and a bottom view of a surface-mounted winding component according to a first embodiment of the present invention.

FIG. 2 is a manufacturing process diagram of a surface-mounted winding component according to the first embodiment of the present invention.

FIG. 3 is a front view and a bottom view of a surface-mounted winding component according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a conventional surface-mounted winding component.

FIG. 5 is a perspective view of a conventional surface mount type winding component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Toroidal core 3 Winding 5 Soldered terminal 6 Wiring groove 7 Projection

Claims (3)

[Claims] 1. A surface-mounted winding component in which a magnetic core is joined to a substrate for holding a magnetic core, and a relatively thick insulating-coated electric wire is wound around the magnetic core, wherein the substrate has a plurality of wiring grooves on opposing side surfaces. A projection is provided on the upper surface of the substrate corresponding to the upper part of the wiring groove, and the end of each terminal drawn out of the winding is removed with an insulating coating, and is subjected to preliminary soldering. It is characterized in that it passes from the upper surface to the lower surface of the substrate, and further passes from the lower surface of the substrate to the upper surface along the other wiring groove facing the lower surface, and the front end portion is bent and locked against the projection. Surface mount type winding parts. 2. A surface-mounted winding component comprising a magnetic core joined to a magnetic core holding substrate, and a relatively thick insulating-coated electric wire wound on the magnetic core, wherein the substrate comprises a plurality of wirings on two opposing side surfaces. A groove is provided, projections are provided at four corners of the upper surface of the substrate corresponding to the upper part of the wiring groove, and a tip portion of each terminal pulled out from the winding is subjected to a preliminary soldering by removing an insulating coating. The upper surface of the substrate is passed from the upper surface to the lower surface along the wiring groove, and the lower surface of the substrate is passed from the lower surface to the upper surface along the wiring groove of an adjacent side surface along the lower surface. A surface-mounted winding component characterized by the following. 3. The surface-mounted wire-wound component according to claim 1, wherein the wire diameter of the insulation-coated electric wire is approximately 80 μm or more.