JP2003217940A - Coil component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil component that prevents the coil height from increasing, even if the coil component is mounted on a circuit board or on a case. <P>SOLUTION: This coil component has a bobbin 23, having a through-hole 21 and upper and lower flanges 22, a coil 24 wound around the bobbin 23, a coil body 30 forming a closed magnetic circuit 29 having a form of square shaped theta by connecting the center magnetic leg 26 and outer magnetic legs 28, and two fixtures 31 to secure the coil main 30 on a circuit board or on a case. The fixture 31 is made in one body of a magnetic core securing part 32, covering the side of the closed magnetic circuit core 29 and a board securing part 33 to fix the coil body 30 on a circuit board or on a case. The magnetic core securing part 32 is fixed on the side of the closed magnetic circuit core 29. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil component used in various electronic devices.

[0002]

2. Description of the Related Art In recent years, for example, an output capacity of 15 has been used for electronic equipment such as a CD player and a radio cassette player.
In a power transformer of about VA, the weight of the power transformer itself becomes heavy. Therefore, the power transformer is mounted on a substrate or a housing by using a metal frame or the like.

A conventional coil component will be described with reference to the drawings.

FIG. 3 is a perspective view of a conventional coil component, and FIG. 4 is an exploded perspective view of the same.

In FIG. 3 and FIG. 4, the conventional coil component is
A bobbin 3 having a through hole 1 and flanges 2 provided at the upper and lower ends, a coil 4 wound around the outer circumference of the bobbin 3, and a central magnetic leg 5 having an I-shaped iron core laminated and inserted into the through hole 1. , A coil in which a C-shaped iron core is laminated and outer magnetic legs 6 arranged on both sides of the central magnetic leg 5 and a central magnetic leg 5 and the outer magnetic leg 6 are joined to form a closed V-shaped magnetic core 7 Parts body 8
A U-shaped metal frame 9 for covering the upper surface and side surfaces of the closed magnetic circuit magnetic core 7, a fixing portion 11 which is provided with holes 10 on the mounting surface of the coil component and is integrally provided at both ends of the metal frame 9. Tongue piece 12 provided at the lower end of the metal frame 9
And a metal plate 13 arranged on the lower surface of the closed magnetic circuit core 7 and covering the bottom surface of the closed magnetic circuit core 7.

At this time, the metal frame 9 is closed magnetic circuit core 7
The tongue piece 12 provided at the lower end of the metal frame 9 so as to cover the closed magnetic circuit core 7 from above and press the metal plate 13 against the closed magnetic circuit core 7 to bend the metal frame 9 and the metal plate 13 into the coil component body 8 It was fixed to the coil component.

Then, the holes 10 of the fixing portions 11 provided at both ends of the metal frame 9 are screwed to fix the coil component and the mounting substrate or the case to the electronic equipment such as a CD player or a radio cassette player. It was built into the device.

However, with the miniaturization and low profile of these electronic devices, there is a strong demand for miniaturization and low profile of the electronic components built into the electronic devices. There has been a strong demand for a low profile for large coil components having a large height.

[0009]

SUMMARY OF THE INVENTION In the above conventional configuration,
Since the upper and lower surfaces of the closed magnetic circuit magnetic core 7 are covered with the metal frame 9 and the metal plate 13, the height of the coil component main body 8 and the thickness of the metal frame 9 and the metal plate 13 are added to increase the height of the coil component. Get higher

Further, since the tongue piece 12 provided at the lower end of the metal frame 9 is bent and the metal plate 13 is fixed, the thickness dimension of the tongue piece 12 also adds to the height dimension of the coil component. Will be higher.

Generally, a steel plate having a thickness of 0.8 mm is used for the metal frame 9 and the metal plate 13.
In the conventional configuration, the height of the coil component body 8 is 0.8 m.
Since the thickness dimension of three m steel plates, the distortion during bending of the steel plates, and the dimensional clearance when attached to the closed magnetic circuit magnetic core 7 increase the height of the coil component,
It was a hindrance to the low profile of coil parts.

In order to solve the above-mentioned conventional problems of the present invention, even if a fixing portion for fixing the main body of the coil component to the mounting substrate or the housing is provided, it is possible to prevent the height of the coil component from increasing. It provides parts.

[0013]

In order to achieve the above object, the present invention has the following constitution.

The invention according to claim 1 of the present invention comprises a bobbin having through holes and flanges at the upper and lower ends, a coil wound around the outer periphery of the bobbin, and a wedge-shaped tapered portion having triangular ends. The I-shaped iron core provided is laminated and the C-shaped iron core having the central magnetic leg inserted through the through hole of the bobbin and the C-shaped iron core having the tapered portions matching the tapered portions of the central magnetic leg is laminated on both sides of the central magnetic leg. The outer magnetic leg arranged on the base, the coil component main body in which the central magnetic leg and the outer magnetic leg are joined together to form a closed V-shaped magnetic core, and two fixings for fixing the coil component main body to the board or housing. The fixture includes a magnetic core side fixing portion that covers a side surface of the closed magnetic circuit magnetic core of the coil component body and a board side fixing portion that fixes the coil component body to a substrate or a housing, and the magnetic core side fixing portion. Is fixed to the side of the closed magnetic circuit core. .

With the above structure, since the magnetic core side fixing portion is fixed to the side surface of the closed magnetic circuit magnetic core, there is nothing to be arranged on the upper surface and the lower surface of the closed magnetic circuit magnetic core, and it is possible to increase the height of the coil component. It can be lost.

At this time, the closed magnetic circuit magnetic core has a central magnetic leg formed by laminating I-shaped iron cores having triangular wedge-shaped tapered portions at both ends, and a C-shaped magnetic core provided at both ends with tapered portions matching the tapered portions of the central magnetic leg. Since the iron cores are laminated and the outer magnetic legs arranged on both sides of the central magnetic leg are joined, it is not necessary to clamp the closed magnetic circuit magnetic core from above and below, and the metal frame and metal plate can be eliminated. Is.

The invention according to claim 2 of the present invention is
Protrusions are provided at the upper and lower ends of the side of the closed magnetic circuit core of the magnetic core side fixed part, and the tips of each of these protrusions are bent inward, and concave grooves that match the protrusions on the side surface of the closed magnetic circuit magnetic core. Is provided, and the protrusion and the recessed groove are fitted to each other to fix the magnetic core side fixing portion to the closed magnetic circuit magnetic core.

With the above structure, the magnetic core side fixing portion and the closed magnetic circuit magnetic core can be fixed only by fitting the protrusion of the magnetic core side fixing portion and the concave groove on the side surface of the closed magnetic circuit magnetic core, and the fixing tool to the coil component body. Can be fixed.

The invention according to claim 3 of the present invention is
The recessed groove is provided at the corner of the closed magnetic circuit core.

With the above structure, since the recessed groove is provided at the corner of the closed magnetic circuit core in which the density of the magnetic flux flowing through the closed magnetic circuit core is low, even if the recessed groove is provided, the reduction of the magnetic flux efficiency can be suppressed.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A coil component according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a coil component according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the same.

As shown in FIGS. 1 and 2, a coil component according to an embodiment of the present invention has a bobbin 23 having a through hole 21 and flanges 22 provided at the upper and lower ends thereof, and a bobbin 23 wound around the outer periphery thereof. The coil 24, a central magnetic leg 26 having I-shaped iron cores provided with wedge-shaped tapered portions 25 at both ends and being inserted into the through hole 21, and a taper matching the tapered portion 25 of the central magnetic leg 26 at both ends. The outer magnetic legs 28, which are formed by stacking the C-shaped iron cores provided with the portions 27 and arranged on both sides of the central magnetic leg 26, and the joint portion 37 of the central magnetic leg 26 and the outer magnetic leg 28.
Is provided to form a closed magnetic circuit magnetic core 29 having a letter V shape, and two fixtures 31 for fixing the coil component body 30 to a substrate or a housing.

Further, the fixture 31 is provided with a magnetic core side fixing portion 32 for covering the side surface of the closed magnetic circuit magnetic core 29 and a substrate side fixing portion 33 for fixing the coil component body 30 to the substrate or the housing in an integrated L-shape. The magnetic core side fixing portion 32 is fixed to the side surface of the closed magnetic circuit magnetic core 29.

Then, the closed magnetic circuit magnetic core 2 of the magnetic core side fixed portion 32
9 are provided with ridges 34 at the upper and lower ends on the side surface side, the respective tips of the ridges 34 are bent inward, and concave groove 35 matching the ridge 34 is provided on the side surface of the closed magnetic circuit magnetic core 29. The projection 34 and the recessed groove 35 are fitted to fix the magnetic core side fixing portion 32 to the side surface of the closed magnetic circuit magnetic core 29.

Further, the recessed groove 35 is provided at the corner of the closed magnetic circuit magnetic core 29.

Further, a hole 36 is formed in the board-side fixing portion 33 on the same plane as the bottom surface of the closed magnetic circuit magnetic core 29, and a screw is inserted into the hole 36 to mount the board fixing portion on a mounting board or a housing. The coil component was attached to the mounting substrate or the housing by screwing it on.

The operation of the coil component according to the embodiment of the present invention will be described below.

The fixture 31 is integrally provided with a magnetic core side fixing portion 32 for covering the side surface of the closed magnetic circuit magnetic core 29 and a substrate side fixing portion 33 for fixing the coil component body 30 to a substrate or a casing.
Since the magnetic core side fixing portion 32 is fixed to the side surface of the closed magnetic circuit magnetic core 29, it is possible to eliminate the parts arranged on the upper surface and the lower surface of the closed magnetic circuit magnetic core 29.

At this time, the closed magnetic circuit magnetic core 29 is provided with a central magnetic leg 26 in which I-shaped iron cores having triangular wedge-shaped tabers at both ends are laminated, and tapered portions at both ends which match the tapered portions of the central magnetic leg 26. Since the C-shaped iron cores are laminated and the outer magnetic legs 28 arranged on both sides of the central magnetic leg 26 are joined to each other, it is not necessary to clamp the closed magnetic circuit magnetic core 29 from above and below, and the metal frame and the metal plate can be fixed. Can be eliminated.

Further, the closed magnetic circuit magnetic core 29 of the magnetic core side fixing portion 32
The protrusions 34 are provided on the upper and lower ends on the side surface side of each of the protrusions 34, and the tips of the protrusions 34 are bent inward.
Since the recessed groove 35 that matches the protrusion 34 is provided and the protrusion 34 and the recessed groove 35 are fitted to fix the magnetic core side fixing portion 32 to the closed magnetic circuit magnetic core 29, the magnetic core side fixing portion Ridge 34
The magnetic core side fixing portion and the closed magnetic circuit magnetic core 29 can be fixed only by fitting the concave groove 35 on the side surface of the closed magnetic circuit magnetic core 29, and the fixture 31 can be fixed to the coil component body 30.

Since the recessed groove 35 is provided at the corner of the closed magnetic circuit core 29 where the density of the magnetic flux flowing through the closed magnetic circuit core 29 is low, the reduction of the magnetic flux efficiency can be suppressed even if the recessed groove 35 is provided. .

As described above, in the coil component according to the embodiment of the present invention, the fixture 31 fixes the magnetic core side fixing portion 32 covering the side surface of the closed magnetic circuit magnetic core 29 and the coil component main body 30 to the substrate or the casing. Since the board-side fixing portion 33 is integrally provided and the magnetic core-side fixing portion 32 is fixed to the side surface of the closed magnetic circuit magnetic core 29, it is possible to eliminate what is arranged on the upper surface and the lower surface of the closed magnetic circuit magnetic core 29. It is possible to reduce the height dimension of the coil component because it is not necessary to add the thickness direction of the metal frame or the metal plate to the height dimension of the component.

Further, the closed magnetic circuit magnetic core 29 of the magnetic core side fixing portion 32
The protrusions 34 are provided on the upper and lower ends on the side surface side of each of the protrusions 34, and the tips of the protrusions 34 are bent inward.
A recessed groove 35 matching the protrusion 34 is provided, and the protrusion 34 and the recessed groove 35 are fitted to each other to fix the magnetic core side fixing portion 32 to the closed magnetic circuit magnetic core 29. Ridge 3
The fixture 31 can be fixed to the coil component main body 30 simply by fitting the concave groove 35 on the side surface of the closed magnetic circuit magnetic core 29 to the coil 4 and bending the tongue provided on the lower end of the metal frame 9 of the conventional coil component. Thus, fixing the metal frame 9 and the metal plate 13 to the coil component body 30 can be eliminated.

Since the recessed grooves 35 are provided at the corners of the closed magnetic circuit magnetic core 29 where the density of the magnetic flux flowing through the closed magnetic circuit magnetic core 29 is low, it is possible to suppress the decrease in magnetic flux efficiency.

[0036]

As described above, according to the present invention, the fixture is integrally provided with the magnetic core side fixing portion for covering the side surface of the closed magnetic circuit magnetic core and the substrate side fixing portion for fixing the coil component body to the substrate or the case. By fixing the magnetic core side fixed part to the side surface of the closed magnetic circuit magnetic core, it is possible to eliminate what is placed on the upper surface and the lower surface of the closed magnetic circuit magnetic core, and to adjust the height of the coil parts to the thickness of the metal frame or metal plate. It is possible to provide a coil component having a reduced height without adding dimensions.

[Brief description of drawings]

FIG. 1 is a perspective view of a coil component according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a perspective view of a conventional coil component.

FIG. 4 is an exploded perspective view of the same.

[Explanation of symbols]

21 through holes 22 Tsuba 23 Bobbin 24 coils 25 Tapered part 26 Central magnetic leg 27 Tapered part 28 Outer magnetic leg 29 Closed magnetic circuit core 30 coil parts body 31 Fixture 32 Magnetic core side fixed part 33 Board side fixing part 34 ridges 35 recessed groove 36 holes 37 Joint

Claims (3)

[Claims] 1. A bobbin having through holes and provided with flanges at upper and lower ends, and a coil wound around the outer periphery of the bobbin.
A C-shaped core formed by stacking I-shaped iron cores having triangular wedge-shaped tapered portions at both ends, and a central magnetic leg inserted into the through hole of the bobbin, and tapered portions at both ends matching the tapered portions of the central magnetic leg. An outer magnetic leg that is formed by stacking iron cores and is arranged on both sides of the central magnetic leg, and a coil component body in which the central magnetic leg and the outer magnetic leg are joined to form a closed V-shaped magnetic core, and the coil. Two fixing tools for fixing the component main body to the board or the housing are provided, and the fixing tool fixes the magnetic core side fixing portion covering the side surface of the closed magnetic circuit magnetic core of the coil component main body and the coil component main body to the board or the housing. A coil component in which a board-side fixing portion is integrally provided, and the magnetic core-side fixing portion is fixed to a side surface of the closed magnetic circuit magnetic core. 2. A ridge is provided on the upper and lower ends of the side of the closed magnetic circuit core of the magnetic core side fixing portion, and the respective tips of the ridges are bent inward, and the protrusion is formed on the side surface of the closed magnetic circuit core. The coil component according to claim 1, wherein a recessed groove that matches the protrusion is provided, and the protrusion and the recessed groove are fitted to fix the magnetic core side fixing portion to the closed magnetic circuit magnetic core. 3. The coil component according to claim 2, wherein the recessed groove is provided at a corner of the closed magnetic circuit magnetic core.