JP2707482B2 - Bobbin for multiple inductor and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention mainly relates to a delay line,
Widely used as an inductance element for filters,
The present invention relates to a multiple inductor bobbin in which a coil is wound in a plurality of sections and a method of manufacturing the same.

[0002]

FIG. 8 is a top view of a conventional bobbin for a multiple inductor. The conventional multiple inductor bobbin is made of a synthetic resin, and has three or more flanges 81 formed on a winding shaft and a coil winding groove 82 separated by the flanges. A metal piece 83 and a magnetic body 84 as a core are embedded in the multiple inductor bobbin. The metal piece 83 has a terminal 85, a connection portion 86 of the coil, and a magnetic material bonding portion 87. The connection portion 86 between the terminal 85 and the coil is
The magnetic material bonding portion 87 which is exposed from both side surfaces of 1 extends to the position of the winding shaft 82 in the winding shaft. The magnetic material 84 is bonded to the magnetic material bonding portion 87 of the metal piece 83, respectively.

It is important for the multiple inductor bobbin to accurately set the inductance of each coil wound around the winding groove and the electromagnetic coupling between the coils. However, in the conventional structure, a plurality of magnetic bodies 8
4 are separately bonded to the metal pieces 83. Therefore, due to an error in the bonding position of each magnetic body 84 and a slight movement of the metal piece 83 when embedding the metal piece 83 in the synthetic resin, the magnetic body 84 is determined and set to an accurate position in the bobbin. It was difficult. Therefore, the inductance of each coil wound in the winding groove 82 and the magnetic coupling between the coils varied from product to product, and if the standard was strict, the yield was significantly reduced. In addition, a plurality of magnetic materials 84 are
3 was also troublesome.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a multiple inductor bobbin capable of accurately setting the inductance of the coil and the electromagnetic coupling between the coils, and a method of manufacturing the bobbin suitable for mass production. is there.

[0005]

The bobbin for a multiple inductor according to the present invention has three or more flanges formed on a winding shaft and a coil winding groove separated by the flanges, and is embedded in the flanges. A metal piece exposed to the outside of the flange and serving as a connection part of a terminal or a coil, a bar-shaped non-magnetic material, a plurality of magnetic materials,
The bar-shaped non-magnetic material has a plurality of magnetic materials formed at predetermined intervals in the length direction, and the plurality of magnetic materials are supported by metal pieces so as to be respectively included in predetermined winding grooves, and are extended to the winding shaft. It is characterized by being present. In the method of manufacturing a bobbin for a multiple inductor in which a winding shaft is formed with three or more flanges and a coil winding groove separated by the flanges, a plurality of rod-shaped magnetic bodies are arranged in parallel with a plate-shaped non-magnetic body. A first step of fixing and integrating at a predetermined interval to the substrate, and a second step of cutting the integrated plate-shaped non-magnetic material and rod-shaped magnetic material into a predetermined width so as to include both.
A third step of fixing a metal piece to a predetermined position of the cut piece, including a non-magnetic material in a winding shaft, and being separated by three or more flanges and the flanges in the length direction of the non-magnetic material And a fourth step of forming a bobbin in which the winding grooves of the coil are connected.

[0006]

The non-magnetic material to which a plurality of magnetic materials are fixed is fixed to a metal piece with solder or an adhesive. A winding shaft, a flange provided on the winding shaft, and a winding groove of the coil separated by the flange are formed using a synthetic resin or a synthetic resin containing magnetic powder.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a bobbin for a multiple inductor according to an embodiment of the present invention; FIG. FIG. 1 is a cross-sectional view showing a first embodiment, and FIG.
FIG. 3 is a perspective view showing a state in which a magnetic material is fixed to a plate-shaped non-magnetic material, and FIG. 4 is a perspective view of a rod-shaped non-magnetic material having a magnetic material fixed thereto and a metal piece.

1 to 4, reference numeral 10 denotes a flange, 11 denotes a winding groove, 13 denotes a magnetic body, 14 denotes an electrode, and 15 denotes a metal piece. The bobbin made of synthetic resin has three or more flanges 10 provided on a winding shaft, and a winding groove 11 of a coil separated by the flanges is formed. Inside the bobbin, a rod-shaped non-magnetic body 12,
A plurality of magnetic bodies 1 fixed to the non-magnetic body 12 at predetermined intervals
3 and a metal piece 15 which supports the non-magnetic body 12 and is exposed at both ends as terminals. Magnetic body 13
Is formed by embedding it in a groove provided on the surface of the non-magnetic body 12 made of ceramic or the like, or by applying and solidifying it in a highly viscous state. Then, the rod-shaped nonmagnetic material 12
Is supported by the metal piece 15 at the flange 10 and is buried substantially at the center axis of the bobbin. At this time, the rod-shaped nonmagnetic material 12
Extends on the winding shaft such that the magnetic bodies 13 are respectively provided inside the predetermined winding grooves 11 of the bobbin. The nonmagnetic material 12
The electrode 14 is printed on a portion supported by the metal piece 15 on the back surface of the substrate. The metal piece 15 is exposed to the outside from both opposing side surfaces of the flange 10 as shown in FIG. 2, and a terminal 16 for surface connection and a connection portion 17 of the coil are formed. Also, the collar 1 of the metal piece 15
The portion extending into 0 is bent into a U-shape. And
The non-magnetic body 12 is supported by the portion bent into the U shape,
The electrode 14 provided on the nonmagnetic material and the metal piece 15 are joined by solder.

The magnetic material 13 as a core and the rod-shaped non-magnetic material 1
2 is provided with grooves at desired intervals in the same direction on the surface of a plate-shaped non-magnetic material 12A made of ceramic as shown in FIG. 3, and a rod-shaped magnetic material 13A made of ferrite is embedded and bonded or painted. It is good to bake in one piece. The electrode 14 is formed on the back surface of the plate-shaped non-magnetic material by printing, printing, or the like. Then, by cutting this into a predetermined width between AB, a magnetic material 13 as a core and a rod-shaped non-magnetic material 12 are integrated. As shown in FIG. 4, the electrodes 14 printed on the back surface of the non-magnetic material 12 are connected to the metal pieces 15 formed on the lead frame. Therefore, the relative positions of the plurality of magnetic bodies 13 serving as the core can be accurately set at one time.

FIG. 5 is a sectional view showing a second embodiment of a bobbin for a multiple inductor according to the present invention. In FIG. 5, 5
2 is a non-magnetic material, and 53 is a magnetic material. The magnetic body 53 is embedded and fixed in grooves provided on both surfaces of the non-magnetic body 52, and is embedded in the bobbin so as to be located at a predetermined winding groove 11. Reference numeral 14 denotes an electrode. By connecting the electrode 14 to the metal piece 15, the non-magnetic
5 supported.

FIG. 6 is a sectional view showing a third embodiment of the multiple inductor bobbin according to the present invention. In FIG. 6, 6
2 is a non-magnetic material and 63 is a magnetic material. The magnetic bodies 63 are arranged at desired intervals on the surface of the non-magnetic body 62, and are fired integrally with the non-magnetic body. In addition, 14 is an electrode. And
By connecting the electrode 14 to the metal piece 15,
2 is supported by the metal piece 15.

FIG. 7 is a sectional view showing a fourth embodiment of the multiple inductor bobbin according to the present invention. In FIG. 7, 7
2 is a non-magnetic material, and 73 is a magnetic material. On both surfaces of the non-magnetic body 72, the magnetic bodies 73 are arranged and fixed at desired intervals. The electrode 14 is printed on a portion of the back surface of the non-magnetic body 72 that is supported by the metal piece 15.

The non-magnetic member 12 with the magnetic member attached to the metal piece 15 of each embodiment thus obtained is placed in a mold and subjected to plastic molding, whereby the bobbin winding shaft, By forming a flange and a winding groove, and subsequently separating the metal piece from the lead frame, the bobbin for a multiple inductor of the present invention is completed.

Although the embodiments of the bobbin for a multiple inductor and the method of manufacturing the same according to the present invention have been described above, the present invention is not limited to these embodiments. For example, the bobbin may be formed by mixing magnetic powder into a synthetic resin. In addition, the metal piece 15
May be a flat plate without bending into a U shape. Further, the non-magnetic material may be attached to the metal piece with an adhesive without providing an electrode.

[0015]

The bobbin for a multiple inductor and the method of manufacturing the same according to the present invention as described above are provided with a magnetic material fixed to a plate-like non-magnetic material at a predetermined interval in advance and cut. A rod-shaped non-magnetic material is formed. Therefore, when forming the bobbin, the magnetic material and the rod-shaped non-magnetic material can be embedded at one time. Therefore, it is not necessary to arrange the magnetic body one by one as before, and the relative position of the magnetic body can be easily set accurately. Then, the inductance of the coil and the electromagnetic coupling between the coils can be set accurately.
Further, according to the structure of the present invention, since the magnetic material is in contact with the metal piece via the non-magnetic material, the demagnetizing effect can be prevented, and the decrease in Q can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of a multiple inductor bobbin according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a perspective view showing a state in which a magnetic material is fixed to a plate-shaped non-magnetic material.

FIG. 4 is a perspective view of a bar-shaped non-magnetic body to which a magnetic body is fixed and a metal piece.

FIG. 5 is a sectional view of a second embodiment of the multiple inductor bobbin of the present invention.

FIG. 6 is a sectional view of a third embodiment of the multiple inductor bobbin of the present invention.

FIG. 7 is a sectional view of a multiple inductor bobbin according to a fourth embodiment of the present invention.

FIG. 8 is a top view of a conventional multiple inductor bobbin.

[Explanation of symbols]

 Reference Signs List 10 flange 11 winding groove 12 non-magnetic material 13 magnetic material 14 electrode 15 metal piece

Claims (2)

(57) [Claims] (1) The winding shaft is defined by three or more flanges and the flanges.
Bolt for multiple inductors with cut coil winding groove
In a bottle, a terminal or coil is embedded in the collar and exposed to the outside of the collar.
Metal piece, rod-shaped non-magnetic material,
The rod-shaped non-magnetic material is provided at predetermined intervals in the length direction.
A magnetic material is formed, and the plurality of magnetic materials are
It is supported by the metal piece so as to be inside the groove, and
A bobbin for a multiple inductor, which extends . 2. The winding shaft is defined by three or more flanges and the flanges.
Bolt for multiple inductors with cut coil winding groove
In the method for manufacturing a bottle, a first step of fixing a plurality of rod-shaped magnetic materials in parallel to a plate-shaped non-magnetic material at predetermined intervals and integrating them ,
Predetermined width to include both non-magnetic material and rod-shaped magnetic material
The second step of cutting into pieces, gold
The third step of fixing the genus pieces, including the non-magnetic material in the winding shaft
And three or more flanges along the length of the non-magnetic material.
Forming a bobbin with a series of coil winding grooves
A method for manufacturing a bobbin for a multiple inductor , comprising the steps of: