JPS6023946Y2 - coil - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a small-sized coil that can obtain a large inductance value, and that can change this inductance value, that is easy to handle, and that can be mass-produced.

Coils that have been commonly used in the past include coils made by winding a conductor wire multiple times, or coils made of a thin plate of ceramic or the like with a spiral conductive film.

However, the former is often deformed during handling and its values change, making it difficult to obtain one with stable characteristics.
Furthermore, it was impossible to incorporate it into automatic machines or the like.

Furthermore, since the latter type uses a thin plate made of ceramic or the like, it has a large shape and is not suitable for miniaturization of the set.

Furthermore, in all of these conventional devices, the inductance value cannot be changed, and if the inductance value is to be changed, a new one must be manufactured.

In addition, in these conventional products, magnetic materials such as ferrite are also used in order to increase the inductance value of the finished coil, but in both cases, handling, holding means, structure, etc. are complicated. It also had the disadvantage of becoming

This invention was made in view of the above-mentioned conventional drawbacks.
A plurality of coil units each having a conductive film applied to an insulating substrate are superimposed, and the coil element and the coil element are housed in a cylindrical magnetic body, and the coil is designed to obtain inductance by this magnetic body and the conductive film. It is something that is involved.

Specific examples of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a coil unit body used in the present invention, in which a is a front perspective view and b is a back perspective view.

In the figure, 1 is a disc-shaped insulating substrate made of ceramic or the like whose circumferential plane is tapered so that the thicknesses of opposing ends t□ and t2 are different. teeth,
A divided annular conductive film 2 is provided on its peripheral edge from the thick part t1 to the thin part t2, and a connection is provided on the horizontal plane to lead out the - end of the conductive film 2 through the side surface of the thin part. A conductive film 3 is provided.

Figure 2 shows a coil in which a plurality (5) of coil unit bodies configured as described above are stacked so that the thick part t□ and the thin part ~ of each adjacent unit body coincide with each other. It is a perspective view showing element C.

In other words, in the coil elements C stacked in this manner, the connecting conductive film 3 of the leftmost unit L1 is conductively connected to one end of the divided annular conductive film 2 of the adjacent unit L1 on the thick part t1 side, The connecting conductive film 3 of this unit body is further conductively connected to the conductive film 2 on the thick portion t1 side of the unit body L3,
Unit body L4 below. It will be electrically connected in the same way as Ln.

As a result, all of the divided annular conductive films 2 provided to the coil unit leave ~Ln are conductively coupled via each connecting conductive film 3.

That is, each conductive film 2 is buried in a substantially spiral shape inside the molded body formed by overlapping each other.

Note that the conductive film 2 of the stacked unit assembly at both ends and the connecting conductive film 3 of the unit body Ln are each appropriately treated to conductively connect them to the other, for example, by attaching lead wires (not shown). or other external connection electrodes (not shown)
For practical use, for example, by connecting the

In addition, it is also possible to make other insulating substrates, such as those with only one side tapered so as to eliminate the taper, come into contact with the units located at both ends (; IJ-1, Ln). .

(Refer to Figure 3) In this case, external connection electrodes for leading out the conductive films 2 and 3 are provided on this insulating substrate, and these electrodes are connected directly or by fixing lead wires or cap terminals to the circuit. It is convenient if the conductive films 2 and 3 are connected inside, and it is even more convenient because the conductive films 2 and 3 are all buried.

The above-mentioned coil units may be stacked at the same time as the conductive film is baked, bonded with an appropriate adhesive, pressed and held from the outside, or housed in a suitable cylindrical magazine. You can go to

In this case, the conductive connection between each conductive film and the connecting conductive film must not be broken.

Also, the means of said electrically conductive connection is completely arbitrary. FIG. 3 is a sectional side view of the coil of the present invention, showing a state in which the above-described coil element C is housed in a cylindrical magnetic body.

In the figure, 4 is a cylindrical magnetic body made of ferrite or the like, and has a size that can accommodate the entire coil element C.
It has a shape.

In this case, an insulating sheet 5 made of resin, paper, or the like is wound around the circumferential side of the coil element C to protect the connecting conductive film 3 present on the circumferential side of the coil element C from damage.

Instead of this insulating sheet 5, an insulating paint may be applied to the entire coil element C, for example.

However, in the present invention, provision of this insulating material is not essential.

In this FIG. 3, 6 is a coil unit I at both ends,
This is an insulator in which a portion of the taper is provided on only one surface of Ln so that the tapered surface can be eliminated.

In this case, it is convenient if the insulator 6 is provided with an electrode 7 for taking out the conductive film 2 and for external connection, which extends from the thin part of the insulator 6 to the outer surface via the side surface.

4 to 7 are perspective views showing other examples of shapes of the coil unit body used in the present invention.

In the fourth figure, the conductive film 2 applied to one plane of the insulating substrate 1 is extended and applied in a substantially annular shape.

This is useful for further increasing the inductance value when the coil is used for high frequency applications, and is also useful for eliminating slight wobble due to the thickness of the conductive film when overlapping.

In the case shown in FIG. 5, the connection conductive film 3 applied to the other plane of the insulating substrate 1 is formed into a divided annular shape so as to match the shape of the adjacent conductive films 2.

According to this, the connection can be made reliably even if the overlapping is slightly misaligned.

In the one shown in FIG. 6, the insulating substrate 1 is shaped like a square plate.

The rest of the structure is the same as that of the embodiment shown in FIG. 1, so the remaining explanation will be omitted.

The one shown in the seventh figure is a modification of the embodiment shown in the first figure, in which a connecting conductive film 3 for leading out the divided annular conductive film 2 to another plane is provided on the side surface of the thin portion t2 of the insulating substrate 1. recess 10
was formed.

By doing so, it is possible to prevent the conductive film 2 and the connecting conductive film 3 from being separated due to friction or the like during handling or the like.

In the embodiments shown in FIGS. 6 and 7, a through hole 8 is formed in the center of the insulating substrate 1, but in the case where such a through hole 8 is provided, for example, a ferrite material is formed in the through hole 8. It is also possible to further increase the inductance value by inserting a magnetic rod (not shown) such as the like.

Further, a female thread may be formed on the inner wall surface of the through hole 8.

FIG. 8 is a perspective view showing another example of the shape of the cylindrical magnetic body 4 used in the present invention, which does not have an open end that encloses the coil element to be housed as a whole. .

For example, as shown in the figure, the cylindrical magnetic body 4 may be formed by dividing the cylindrical magnetic body 4 into two halves in the longitudinal direction and joining them together.

According to this, a coil having a closed magnetic circuit as a whole can be obtained, and its inductance value can be greatly improved.

Reference numeral 9 in the figure indicates a hole for leading out a lead wire, for example, for electrically connecting the housed coil element to the outside.

It should be noted that it is easy to understand that various design changes can be made to the present invention from the above-mentioned embodiments and the specific examples shown in the drawings, and these are naturally not beyond the scope of the present invention.

Further, for example, if a magnetic material such as ferrite is used for the insulating substrate 1, it goes without saying that the inductance value can be further increased, but in the present invention, such a material can be arbitrarily selected.

Further, in the present invention, the same effect can be expected even if the coil element is coated with magnetic paint without forming the cylindrical magnetic body in advance.

As described above, the coil of the present invention is made by stacking and fixing an appropriate number of coil units and storing them in a cylindrical magnetic body.It is robust and easy to handle, and can be formed into a columnar shape as a whole. Since it can be made to match the shape of resistors and capacitors, etc., it is more suitable for handling by automatic machines.

In addition, the inductance value of the coil of this invention can be changed by changing the number of stacked units, making it possible to manage coils of various values very well, and in addition, the conductive film is embedded. This results in stable characteristics.

Furthermore, with the present invention, all the coil units need only be formed in the same shape, and their overlapping can be done by matching the thick and thin parts, so no skill is required for the work. At the same time, maintenance management of parts becomes easier and it becomes suitable for mass production.

In addition, since it can be made into a closed magnetic circuit type using a cylindrical magnetic material, a product with a large inductance value can be obtained, which can expand the range of applications, and has extremely high practical value.

[Brief explanation of the drawing]

Fig. 1 is a front and back perspective view showing an example of the shape of the coil unit used in the coil of the present invention, Fig. 2 is a perspective view of a coil element showing a state in which a plurality of the units shown in Fig. 1 are stacked together, and Fig. 3 is a perspective view of the coil element. is a side sectional view showing an example of the shape of the coil unit of the present invention using the coil element of FIG. 2, and FIGS. 4 to 7 are perspective views showing other examples of the shape of the coil unit used in the present invention, FIG. 8 is a perspective view showing another example of the shape of the cylindrical magnetic body used in the present invention. 1... Insulating substrate, 2... Conductive film, 3.
...Connection conductive film, 4...Cylindrical magnetic body, L
・・・・・・Coil unit body, Thick part, t
2... Thin wall portion, C... Coil element.

Claims (1)

[Scope of utility model registration request] An insulating substrate whose circumferential plane is tapered so that opposing ends have different thicknesses, and a division provided on one plane of the insulating substrate from a thick part to a thin part of the insulating substrate. A plurality of coil units each consisting of an annular conductive film and a connecting conductive film provided so that one end of the conductive film is led out to the ground plane via the side surface of the thin part of the insulating substrate are arranged so that the thickness of each coil unit is A coil element integrally formed by overlapping and fixing the parts so that the parts and the thin parts match, and electrically connecting each of the connecting conductive films and the other end of the divided annular conductive film of another coil unit body. A coil characterized by being housed in a cylindrical magnetic body.