JPH113823A - Surface mounted coil part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size and the profile of surface mounting type coil parts and, at the same time, to reduce the cost of the parts, by continuously forming at least two or more grooves having opened ends in the outer peripheral direction from the bottom section of a flange at the lower end of a drum-shaped core to the side face of the flange. SOLUTION: A drum-shaped core 1 of surface mounting type coil parts 20 is made of a material composed of 48 mol.% Fe2 O2 , 15 mol.% NiO, 6 mol.% CuO, and 31 mol.% ZnO. Then, the winding 2 of the core 1 is formed by winding conductor 11 around the core 1 in such a way that the conductor 11 is brought to the inside of a flange section after the conductor 11 is wound around the core 1 by a prescribed number of turns and passed through the side face section 3 of the groove of a flange 9a at the lower end of the core 1, a groove 4 provided on the bottom section of the flange 9a, and the side face section 3 of the groove of the flange 9a and the front end of the conductor 11 is soldered to the root of the conductor 11 itself. The enamel coating of the conductor 11 is removed from the part of the conductor 11 which is passed through the groove 4 by solder dipping before the conductor 11 is passed through the groove 4 after the conductor 11 is wound around the bobbin section 8 of the coil 1 and passed through the side face sections 3 of the grooves of the flange 9a. Therefore, the height of the coil parts 20 is reduced and the manufacturing process of the parts 20 can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount type coil component such as a choke coil which is surface mounted on a circuit board of an electronic device.

[0002]

2. Description of the Related Art In recent years, there has been a strong demand for smaller and higher-performance electronic devices and the like, and accordingly, in electronic components mounted on electronic circuit boards, coil components such as choke coils occupying a relatively large volume. However, a structure that is suitable for surface mounting while being reduced in size and thickness has been developed.

For example, a choke coil is used in a rectifying / smoothing circuit for the purpose of removing noise generated in a ripple voltage for an electronic device such as a power supply device, or when it is inserted in series in a communication line or an electronic circuit. , For blocking signals in a specific frequency range.

As shown in FIG. 4, in a conventional surface mount type coil component, a winding 2 is wound around a coil winding shaft portion 8 of a drum type core 1 made of a magnetic material, and is integrally formed with a metal electrode surface 7. One of the flanges 9b is bonded and fixed to the synthetic resin pedestal 5 having the lead terminals 6, and the end 10 of the winding 2 is wound around the lead terminals 6.

[0005] By the way, when the conventional synthetic resin pedestal is used and only the length of the winding portion of the drum core of the same shape is shortened to reduce the height, the length of the winding portion of the core is reduced. Therefore, depending on specifications, a desired number of windings cannot be formed, and a desired inductance value cannot be obtained.

Further, since the leakage magnetic flux of the core decreases and the DC superimposition characteristic also deteriorates, the use of the pedestal does not reduce the height of the drum-type core body. It is necessary to erect.

[0007]

As described above, a coil component having a structure in which a conventional drum-shaped core and a synthetic resin pedestal with lead terminals are combined has the following problems. The pedestal part is thick, the height of the entire coil part is high,
Contrary to the demand for thinning. Since the positioning is necessary when the drum-shaped core is bonded and fixed to the synthetic resin base, the number of manufacturing steps increases. The pedestal made of synthetic resin with lead terminals is expensive and the production cost of the coil component is high.

Accordingly, the present invention has been made in view of the above problems, and eliminates the need for a pedestal with a lead terminal, thereby reducing the height and simplifying the process, and realizing a cost reduction. A coil component is provided.

[0009]

According to the present invention, a winding is wound around a coil winding shaft portion of a drum type core made of a magnetic material having a flange disposed at each of an upper end and a lower end of a columnar coil winding shaft portion. A surface-mounted coil component comprising: at least two or more grooves whose end portions are opened in the outer peripheral direction from the bottom of the flange at the lower end of the drum-shaped core to the side surface. Parts.

The present invention is the above-mentioned surface-mount type coil component, wherein a conductive material at an end of a winding wound around a coil winding portion is provided in the groove.

The present invention is the above-mentioned surface-mount type coil component, wherein the shape of the groove is substantially U-shaped.

In the present invention, the depth of the groove formed at the bottom of the lower end flange is a depth corresponding to the wire diameter of the winding, and the conductor at the end of the winding inserted into the groove. Is used as it is as an electrode to the mounting substrate, and there is no need to form a new electrode. Also, on the surface of the lower end flange that is to be an electrode to the mounting substrate, the depth of the groove is made equal to the wire diameter, and the shape of the groove is substantially U-shaped, so that the seating on the mounting substrate is good, Floating can be prevented.

As described above, by forming the surface mount type coil component having the structure of the present invention, the electrodes can be formed and mounted on the mounting board without using a conventional synthetic resin pedestal. Therefore, the height can be reduced, the manufacturing process of the coil component can be simplified, and the cost can be reduced.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view of a surface mount type coil according to an embodiment of the present invention. FIG. 1A is a cross-sectional view, and FIG.
Is a bottom view. In FIG. 1, the end 10 of the conductive wire wound around the coil winding shaft 8 is a side surface 3 of a groove of a lower end flange 9 a.
And further passes through the groove 4 at the bottom of the lower end flange 9a, again passes through the side surface portion 3 of the groove, returns to the inside of the lower end flange, and is soldered to the root of the conductor itself.

The conductor 11 at the portion passing through the groove 4 at the bottom of the flange 9a at the lower end must be previously removed from the enamel or the like provided on the conductor 11 by solder dip or the like. The object is achieved by providing the surface mount type coil described above.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, the drum type core of the surface mount type coil component 20 is composed of 48 mol% of Fe ₂ O ₃ ,
mol%, CuO: 6 mol%, ZnO: 31 mol%
And manufactured according to a conventionally known method.

After a predetermined number of windings, the windings 2 (e.g., enameled conducting wires) of the drum-type core 1 pass through the side surface portions 3 of the grooves of the lower end flange 9a, and are further placed on the bottom of the lower end flange 9a. Through the groove 4 provided, again through the side surface 3 of the groove of the flange 9 at the lower end,
The wire 11 was brought into the inside of the flange, and the tip of the wire 11 was soldered to the root of the wire itself. The conductor has a wire diameter of φ0.3.
mm. The depth of the groove of the groove 4 is 0.5 mm
And Note that the enamel coating applied to the conductive wire 11 passes through the groove 4 before passing through the groove 4 after passing through the side surface 3 of the groove of the flange 9 a at the lower end after being wound around the coil winding shaft portion 8. The part to be removed is removed by solder dip.

(Comparative Example) A conventional surface mount type coil component using a drum core of the same shape as shown in FIG. 4 uses a pedestal, so its height from the electrode surface is 6.5 mm.
The height is 1.5 mm higher than the height of the drum core body.

FIGS. 2 and 3 show the Lf characteristics and the DC superimposition characteristics of the surface-mount type coil of the present invention manufactured in the above-described embodiment and comparative example, and the conventional product. 2 and 3, A and C are the characteristics of the product of the present invention, and B and D are the characteristics of the conventional product.

As a result, as can be seen from FIGS. 2 and 3, it was found that the surface-mount type coil according to the present invention had almost no difference compared with the conventional surface-mount type coil.

[0022]

As described above, according to the surface mount type coil component of the present invention, the pedestal and the electrode, which were conventionally required separately, are not required, and the size and height are reduced. It has an excellent effect that cost is reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a surface-mounted coil component according to an embodiment of the present invention. FIG. 1A is a sectional view. FIG. 1B is a bottom view.

FIG. 2 is a perspective view of a surface mount type coil component according to an embodiment of the present invention;
The figure which shows -f characteristic.

FIG. 3 is a diagram showing a DC superposition characteristic of the surface mount type coil component according to the embodiment of the present invention.

FIG. 4 is an explanatory view of a conventional surface mount type coil component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drum type core 2 Winding 3 Side surface part of groove 4 Groove 5 Pedestal 6 Lead terminal 7 Electrode surface 8 Coil winding shaft part 9, 9a, 9b Flange 10 (End of winding) 11 Lead wire 20 Surface mount type coil part A , C Characteristics of the product of the present invention B, D Characteristics of conventional (comparative) product

Claims (3)

[Claims] 1. An upper end and a lower end of a columnar coil winding shaft portion,
In a surface-mount type coil part obtained by winding a winding around a coil winding part of a drum type core made of a magnetic material provided with a flange, the bottom side of the lower end of the drum type core is continuous from the bottom to the side surface, A surface-mounted coil component having at least two or more grooves whose ends are opened in the outer peripheral direction. 2. The surface-mount type coil component according to claim 1, wherein a lead wire at an end of the winding wound around the coil winding portion is provided in the groove. 3. The surface mount type coil component according to claim 1, wherein the shape of the groove is substantially U-shaped.