JPH0346490Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a chip-type inductance element.

(Prior art) A conventional inductance element is, for example, a 10th inductance element.
As shown in the figure, a pair of flat flanges 2 and 3 of different sizes made of the same material as the winding part 1 are integrally attached to both ends of a rectangular coil winding part 1 made of a magnetic material such as ferrite. Of the pair of flanges 2 and 3, the wider flange 3 is the installation side for the mounting part of a printed circuit board, etc., and a pair of electrodes 4, formed on the installation surface which is the bottom surface of this installation side. 5, both ends 7 of the coil 6 wound on the coil winding part 1,
8 were connected by soldering. However, the inductance element with this conventional configuration has a small inductance value because it has an open magnetic path.
Since the magnetic flux crosses the electrodes 4 and 5, the Q is low, and since the electrodes exist only on the installation surface, there are disadvantages such as a weak adhesive strength to the mounting part of a printed circuit board or the like by solder connection.

Therefore, in order to increase the inductance value and increase the Q, as shown in FIG. It is conceivable that the opening surfaces are joined to and covered with the upper surface of the flange 2 and the upper surface of the flange 3, respectively. However, in this method, the inductance value is certainly large because it is a closed magnetic circuit, and the Q is also high because the magnetic flux does not cross the electrodes 4 and 5, but there are unavoidable unevenness and warpage on the joint surfaces. If the connection becomes unstable, the cap 9
Since it itself is the main magnetic path, it has the disadvantage that stable effects cannot be expected. Also,
In order to increase the adhesive strength to the mounting part of the printed circuit board, etc., the flange 3 on the installation side is attached as shown in Fig. 12.
It is conceivable to form a pair of electrodes 10 and 11 on opposing side surfaces of the mounting surface in a continuous manner with electrodes 4 and 5 formed on opposing ends of the installation surface. However, with this method, the adhesive strength to the mounting part of the printed circuit board etc. is strengthened, but in addition to the electrodes 4 and 5, the electrodes 10 and 11
However, since an eddy current is generated, the Q value becomes even lower.

(Purpose) The present invention has been made in view of the above points, and aims to provide an inductance element that solves all of the above-mentioned drawbacks, is easy to assemble, and has a stable inductance value.

(Summary) The present invention forms a pair of continuous electrodes on the side surface of a wide flange and opposing ends of the installation surface, and a pair of electrodes on one opposing end of the non-wide flange. A pair of notches are formed. Furthermore, the coil between the flanges is covered with a magnetic powder-containing resin case having a pair of protrusions that fit into the pair of notches.

(Example) An example of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view of the first embodiment of the inductance element of the present invention, with the resin case containing magnetic particles removed, FIG. 2 is a bottom view thereof, and FIG. 3 is a plan view of the resin case containing magnetic particles. , FIG. 4 is a longitudinal sectional view taken along line A-A', FIG. 5 is a perspective view of the inductance element of the present invention, and FIG. 6 is a longitudinal sectional view taken along line BB'.

In these figures, 12 is a rectangular first flange made of a magnetic material such as ferrite;
is a second flange that is wider than the rectangular first flange 12 made of a magnetic material such as ferrite. This second flange 13 becomes the installation side for a wiring board or the like. 14 and 15 are notches formed on opposing edges of the first flange 12, and 16 is a coil wound around a prismatic coil winding portion 17 formed between both flanges 12 and 13. It is a coil. 18 and 19 are the second flange 1
3, electrodes 20 and 21 are formed at opposite ends of the installation surface which is the bottom surface of the second flange to which both lead terminals 22 and 23 of the coil 16 are respectively soldered connected. It is an electrode. These electrodes 18 and 20 and 19 and 21 are formed continuously. 24 covers the side surface of the first flange 12 and the periphery of the coil 16;
A magnetic powder-filled resin case with openings on both sides is in contact with the upper surface of the second flange 13, and 25, 26 are the notches 14,
15 and is a pair of protrusions provided on the inner surface of the magnetic powder-containing resin case 24 that abuts the second flange 13. The protrusions 25 and 26 are formed across both open ends of the case 24, and form a main magnetic path at this portion. Note that the magnetic powder-containing resin case 24 is joined to the second flange 13 with an adhesive or the like. Further, when using an adhesive, an even better closed magnetic path can be obtained by mixing magnetic powder or the like into the adhesive.

Although the inductance element of the present invention is constructed as described above, it is not necessarily limited to that of the above embodiments, and it goes without saying that changes may be made as appropriate without changing the gist. For example, the first flange 12 and coil 1 of the present invention
The magnetic powder-containing resin case 24 covering the outer circumference of the magnetic powder-containing resin case 24 does not necessarily need to have its entire lower open end in contact with the second flange 13. It may be formed as shown in the figure. That is, 27 and 28 are first and second recesses formed at one end of the second flange 13, and 29 and 30 are third and third recesses formed at the other end of the second flange 13. This is the concave portion of 4. 3
2 and 33 are first and second convex portions provided at one open end of the magnetic powder-containing resin case 31;
and is fitted into the second recesses 27 and 28. Also, regarding the third and fourth recesses,
Although not shown here, the other side of the magnetic powder-containing resin case 31 having a convex portion similar to the first and second convex portions 32 and 33 is fitted. In this way, the magnetic powder-containing resin case 3 is attached to the second flange 13.
1 are joined, the lead end 22 of the coil 16 is pulled out into the first recess 27, and the lead end 23 of the coil 16 is pulled out into the second recess 28. In addition, in this second embodiment, the second flange 13 and the magnetic powder-containing resin case 31
The second flange 13 is provided with one recess and the lead terminals 22 and 23 of the coil 16 are pulled out at a predetermined interval into the recess. In this case, the magnetic powder-containing resin case 31 may have only one convex portion corresponding to the concave portion. In this second embodiment, by adopting such a structure, the bonding state between the magnetic powder-containing resin case 31 and the second flange 13 is improved, and the lead terminals 22 and 23 of the coil are also protected. It is valid.

In addition, as shown in FIG. 9 showing a third embodiment of the present invention, two or more holes are provided on one side of the magnetic powder-containing resin case 36 to take out the lead terminals 22 and 23 of the coils to the outside of the magnetic powder-containing resin case 36. small holes 34,3
5 may be provided. In this third embodiment, by adopting such a structure, the lead terminal 2 of the coil is
2 and 23 prevent the magnetic powder-containing resin case 36 from lifting up, thereby improving the bonding state between the magnetic powder-containing resin case 36 and the second flange 13 as in the case of the second embodiment. It is also effective in protecting the lead terminals 22 and 23.

(Effects) As explained above, in the inductance element of the present invention, by covering the coil with a resin case containing magnetic particles, the case itself is less prone to warping or unevenness compared to when a cap made of magnetic material such as ferrite is used. As a result, a closed magnetic path is formed in closer contact with the flange, and furthermore, a magnetic powder-filled resin case is provided on the inner surface of the magnetic powder-filled resin case that fits into the recess provided in the first flange and comes into contact with the second flange. Since the convex portion becomes the main magnetic path, a large inductance value can be stably obtained. In addition, since electrodes are provided on the side surface of the second flange continuously with the electrodes on the bottom surface, even though the adhesive strength to the mounting part such as a printed circuit board is increased, those electrodes are connected to the flange and the magnetic powder Since it exists outside the closed magnetic path formed by the resin case, there is almost no magnetic flux crossing the electrode, and as a result, generation of eddy current on the electrode surface is prevented, resulting in a high Q. Further, by forming a closed magnetic path, there are various effects such as almost eliminating mutual magnetic influence between adjacent components.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the first embodiment of the inductance element of the present invention, with the resin case containing magnetic particles removed, FIG. 2 is a bottom view thereof, and FIG. 3 is a plan view of the resin case containing magnetic particles. , FIG. 4 is a longitudinal cross-sectional view taken along line A-A', FIG. 5 is a perspective view of the inductance element of the present invention, FIG. 6 is a vertical cross-sectional view taken along line B-B', and FIG. is a bottom view of the second embodiment of the inductance element of the present invention, FIG. 8 is a side view of the resin case containing magnetic particles of the second embodiment of the inductance element of the present invention, and FIG. 9 is the bottom view of the second embodiment of the inductance element of the present invention. Perspective view of the third embodiment of the inductance element, No. 10
The figure shows a side view of a conventional inductance element, the first
FIG. 1 is a sectional side view of a main part of another conventional inductance element, and FIG. 12 is a side view of still another conventional inductance element. 12, 13... flange, 14, 15... notch, 16... coil, 17... coil winding part,
18, 19, 20, 21... electrode, 22, 23...
...Lead terminal, 24, 31, 36...Resin case containing magnetic powder, 25, 26...Protrusion, 27, 28, 2
9, 30... recess, 32, 33... protrusion, 34,
35...Small hole.

Claims (1)

[Claims for Utility Model Registration] First and second flanges integrally formed at the upper and lower ends of the coil winding part, respectively;
An inductance element consisting of a pair of electrodes formed on the flange of the inductor, a coil whose both ends are connected to the pair of electrodes and wound around the coil winding part, and a magnetic cap for forming a closed magnetic circuit. The first flange has a pair of notches at opposing ends, the second flange is formed wider than the first flange, and the pair of electrodes have a pair of notches at opposing ends. The magnetic cap is formed continuously on opposing ends of the side and bottom surfaces of the flange, respectively, and the magnetic cap is made of a resin case containing magnetic particles, and has a pair of protrusions that fit into the pair of notches. An inductance element, characterized in that the inductance element covers the side surface of the first flange and the circumferential surface of the coil so that the upper surface of the first flange is exposed to the outside, and is placed on a second flange.