JPS62190825A - High-frequency coil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high frequency coil using a multilayer circuit board.

Conventional technology In recent years, there has been a marked trend toward smaller and thinner electronic devices, and as a result,
There has been an increasing demand for miniaturization and thinning of the high-frequency circuits that make up these devices, such as receiver front-end sections and chainer sections.

The main challenges for making these high-frequency circuits smaller and thinner are making the coil smaller and thinner, establishing thin electromagnetic shielding technology, making the adjustment circuit elements smaller and thinner, such as trimmer capacitors, etc. There are some ways to eliminate adjustment by devising the circuit.

Among the above-mentioned problems, many attempts have been made to reduce the size and thickness of coils, and progress has been particularly remarkable in the field of chip coils and printed coils with leadless structures.

Since the present invention relates to a printed coil, a conventional printed coil will be described.

Fig. 3 fa+-(bl shows the configuration of a toroidal printed coil that has been conventionally commonly used in the high frequency field. In Fig. 3, 21 is a linear conductive part formed on the first conductor layer, and 22 are linear conductive parts formed in the second conductor layer, and are opposed to each other with the insulator layer 23 in between.

As shown in FIG. 3, both ends of the linear conductive parts 21 and 22 are on two concentric circles, and both ends of the linear conductive part 21 of the first conductor layer are connected to the two straight conductive parts of the second conductor layer. By connecting the ends of each straight conductive part with through holes 25,
It constitutes a toroidal printed coil. Also, 2
4a and 24b are electrode terminals of the coil.

Problems to be Solved by the Invention However, in a toroidal printed coil as shown in Figure 3, the conductive part that makes up the coil is in the form of a thin wire and the conductor resistance is large, so the Q of the coil is small. . Furthermore, since the current flows locally, there is a lot of leakage magnetic flux.

Means for Solving the Problems In order to solve the above problems, the high frequency coil of the present invention has the following features:
When forming a plurality of interrupted fan-shaped conductive parts arranged in a donut shape on the first conductor layer and the second conductor layer facing each other with the first insulator layer in between, each fan of the first conductor layer The outer peripheries of the fan-shaped conductive parts of the 2211th body layer face each other, and the inner peripheries of the fan-shaped conductive parts of the first conductor layer face each other at their outer peripheries. The fan-shaped conductive parts of the conductor layer are formed to face the inner peripheral parts of the fan-shaped conductive parts of the adjacent second conductor layer, and the inner peripheral parts of the fan-shaped conductive parts facing each other are Except for one place, each fan-shaped conductive part of the first conductor layer and each fan-shaped conductive part of the second conductor layer are connected through-holes at the outer and inner peripheries, and the through-holes of the first conductor layer and the second conductor layer are Take out the electric bridge from the fan-shaped conductive part that is not connected to the hole,
A toroidal printed coil is formed by each sector-shaped conductive part and through hole.

According to the above-described structure, the present invention reduces the conductor resistance and improves the Q of the coil by making the shape of the conductive part formed in the conductor layer constituting the toroidal printed coil fan-shaped. The leakage flux can be reduced by dispersing the paths.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIGS. 1A and 1B are a plan view and a side view showing the configuration of a high-frequency coil in a first embodiment of the present invention.

In FIG. 1, reference numeral 1.2 denotes a fan-shaped conductive portion formed in the first conductor layer and the second conductor layer that face each other with the edge layer 3 in between, and each fan-shaped conductive portion l of the first conductor layer and a second conductor layer in which the outer periphery of each fan-shaped conductive part 2 of the second conductor layer is opposed to each other, and the inner periphery of each fan-shaped conductive part 1 of the first conductor layer is opposite to each other at their outer periphery. It is formed to face the inner peripheral part of each fan-shaped conductive part 2 of the second conductor layer adjacent to each fan-shaped conductive part 2 of the conductor layer, and the opposing outer peripheral part or inner part of each fan-shaped conductive part The fan-shaped conductive parts 1 of the first conductor layer and the fan-shaped conductive parts 2 of the second conductor layer are connected with through holes 5 at the outer and inner peripheries except for one part of the periphery, and the first conductor The electrode terminals 4a and 4b are taken out from the portions of the fan-shaped conductive portions 1.2 of the second conductor layer that are not connected through the through holes, and a toroidal printed coil is formed by the fan-shaped conductive portions 1, 2 and the through holes 5. Can be configured.

In addition, in FIG. 1 (al, (bl), the fan-shaped conductive part 1 of the first conductor layer, the fan-shaped conductive part 2 of the second conductor layer, and the through hole 5 are formed by arranging multiple sets of similar ones on concentric circles. Something,
The numbers in the figure are for only one set.

With the above configuration, the shape of the conductive part of the toroidal printed coil can be fan-shaped, the conductor resistance can be reduced, the Q of the coil can be improved, and the leakage magnetic flux can be reduced by dispersing the current path. .

In addition, there are three through holes 5 on the outer circumference and two on the inner circumference in FIG. Needless to say, the conductor resistance due to the through holes is reduced, the Q of the coil is improved, and the current path is dispersed, reducing leakage magnetic flux.

In addition, the electrode terminals 4a and 4b are taken out one by one from the outer periphery of the fan-shaped conductive part of the first conductor layer and the second conductor layer.
It may be taken out from the outer periphery of the fan-shaped conductive part of either the first conductor layer or the second conductor layer, or it may be taken out from the inner periphery.

Furthermore, it goes without saying that an electrode terminal can be taken out from any part of the sector-shaped conductive part constituting the toroidal printed coil and used as a tap terminal of the coil.

FIG. 2 is an external perspective view showing the configuration of a high frequency coil in a second embodiment of the present invention.

In FIG. 2, 11 is a first five-body layer, 12 is a second conductor layer, 13 is a first insulator layer, and 14a, b are electrode terminals, which are the toroidal printed coils in the first embodiment of the present invention. correspond to the first conductor layer (
corresponds to the second conductor layer (the fan-shaped electrode) 2, the first insulator layer 3, and the electrode terminals 4a and 4b.

18.16 is a second insulator layer and a third conductor layer placed adjacent to the first conductor layer 11, and 19.17 is a second conductor layer 12.
A third insulating layer and a fourth conductive layer placed adjacent to each other in order,
The third conductor layer 16 and the fourth conductor layer 17 are connected to the first conductor layer 11.
It is used as an effective shielding material for the toroidal printed coil formed between the second conductor layer 12 and the second conductor layer 12.

With the above configuration, it is possible to provide a toroidal printed coil with a shielding function.

Effects of the Invention As described above, the present invention improves the Q of the coil and reduces leakage magnetic flux by making the shape of the conductive part formed in the conductor layer constituting the toroidal printed coil fan-shaped. can.

[Brief explanation of drawings]

Fig. 1 is a plan view and a side view of a high-frequency coil according to a first embodiment of the present invention, Fig. 2 is an external perspective view of a high-frequency coil according to a second embodiment of the present invention, and Fig. 3 is a conventional toroidal type coil. FIG. 3 is a plan view and a side view of a printed coil. 1.21...Conductive part of first conductor layer, 2,22...
...Conductive part of second conductor layer, 11...1st
Conductor layer, 12... Second conductor layer, 3, 13.23
......1r color frame layer, 4a, b, 14a, b,
24 a, b-- Electrode terminal, 5, 25...
・Through hole, 16...Third conductor layer, 17・
...4th conductor layer, 18...2nd insulator layer, 19...3rd insulator layer Name of agent Patent attorney Toshio Nakao 1 person try (1 figure
E-T
＋ ＊＋Honshibarakinoro 1i Oka? ---Meeting 2 #3---↑1Rei 1 4a, 4--(Gon Iay (Cλ,)?--SuIL-a-noshi Fig. 3

Claims (3)

[Claims] (1) A first conductor layer and a second conductor layer facing each other with the first insulator layer in between.
When forming a plurality of interrupted fan-shaped conductive parts arranged in a donut shape on the conductor layer, each fan-shaped conductive part of the first conductor layer and each fan-shaped conductive part of the second conductor layer are formed. A plurality of fan-shaped conductive parts adjacent to each of the sector-shaped conductive parts of the second conductor layer, the outer peripheral parts of which are opposite to each other, and whose inner peripheral parts of each of the fan-shaped conductive parts of the first conductor layer are opposite to each other at their respective outer peripheral parts. The second conductor layer is formed so as to face the inner circumference of each of the fan-shaped conductive parts, and the first
Each of the fan-shaped conductive parts of the conductor layer and each of the fan-shaped conductive parts of the second conductor layer are connected through holes at the outer and inner peripheral parts, and the first
A high-frequency coil characterized in that electrode terminals are taken out from portions of the fan-shaped conductive parts of the conductor layer and the second conductor layer that are not provided with through-holes, and a toroidal-shaped printed coil is constructed by each of the fan-shaped conductive parts and the through-holes. . (2) A high frequency device according to claim 1, characterized in that an electrode terminal is taken out from an arbitrary part of a fan-shaped conductive part that constitutes a toroidal printed coil, and the electrode is used as a tap terminal of the coil. coil. (3) a second insulator layer and a third insulator layer provided adjacent to each other at positions sandwiching the first conductor layer and the second conductor layer from the first insulator layer; a third conductor layer provided adjacent to a position sandwiching the two insulator layers; and a fourth conductor layer provided adjacent to a position sandwiching the third insulator layer from the second conductor layer. 3. The high frequency coil according to claim 1, wherein the third conductor layer and the fourth conductor layer are used as effective shield layers for the coil.