JPH0451502A - In-phase inductor - Google Patents

Abstract

PURPOSE:To obtain a high quality in-phase inductor having adequate function as an electronic component under severe environments by integrated sintering of at least two conductors, through a non-magnetic insulator, enclosed in a magnetic substance and in addition by providing with film sheet form terminals to be connected to conductors on the magnetic substance surface corners. CONSTITUTION:Conductor 43 is fitted on a lower insulating magnetic sheet 41 with metal paste having a high melting point such as silver paste or silver alloy paste. This is further fitted with a non-magnetic insulator 45 and then with a conductor 44 in that order. An upper insulating magnetic sheet 42 is finally fitted to finish its assembling and laminated body having a closed magnetic path is formed by enclosing all of the substances mentioned above, except for the corner of the conductors 43 and 44. The whole body is sintered and then film electrode terminals 66A, 66B, 67A and 67B are provided, with printing or plating, on the conductor corners. The non-magnetic insulator 45 is composed of non-magnetic zinc ferrite's.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to surface-mounted electronic components used in electronic circuits,
In particular, the present invention relates to common-mode inductors used in high-frequency circuits and subjected to nine-sided mounting.

[Prior Art] In a conventional in-phase inductor as a surface-mounted electronic component, at least two linear or meandering conductors are surrounded by a magnetic material and integrally sintered, as shown in FIG. At the same time, film-shaped electrode terminals connected to the conductors were provided on the end faces of the magnetic body.

Note that the insulating magnetic material herein generally refers to a material that exhibits 1 ferromagnetic properties, as typified by NiZn ferrite, etc.
It is possible to sufficiently secure a resistivity of 105Ω (up to) or more.

[Problems to be Solved by the Invention] However, due to the structure of the conductor constituting the conventional in-phase inductor, the magnetic material surrounding the conductor has
Since the conductor surfaces are placed adjacent to each other and are used in harsh environments with high temperatures and humidity, short circuits may occur between the conductors due to the ingress of moisture, and further migration and corrosion may occur between the conductors. Its own DC resistance increases.

In the worst case scenario, the wire may break, causing the inductor to stop functioning as a common-mode inductor.

Furthermore, in terms of characteristics, in the conventional in-phase inductor, since the conductors are made of a magnetic material, the magnetic coupling between the conductors is extremely disadvantageous.

Therefore, in view of the above-mentioned drawbacks, the technical problem of the present invention is to provide a high-performance in-phase inductor that fully satisfies the function as an electronic part even when used in a harsh environment and has extremely advantageous magnetic coupling. It will be done.

[Means for Solving the Problems] According to the present invention, there is provided a laminate body including a plurality of conductors spaced apart from each other and facing each other and a non-magnetic insulator interposed between the plurality of conductors; An in-phase inductor comprising: an insulating magnetic material covering a main body; and a plurality of electrode terminals provided on the outer surface of the insulating magnetic material and electrically connected to each of the plurality of conductors. can get.

Further, according to the present invention, there is provided a laminate body including a plurality of conductors facing each other and separated from each other and a non-magnetic insulator including the plurality of conductors, and an insulating magnetic material covering the laminate body. and a plurality of electrode terminals provided on the outer surface of the insulating magnetic material and electrically connected to each of the plurality of conductors.

Further, according to the second aspect of the present invention, there is obtained the in-phase inductor, wherein the non-magnetic insulator includes a zinc-based non-magnetic ferrite.

That is, according to the present invention, in the first claim, at least two
The above-mentioned linear or meandering conductors are each surrounded by a magnetic material through a non-magnetic insulator, and are sintered together, and film-like electrode terminals are provided on the end faces of the magnetic material to connect with the conductors, respectively. By adopting this structure, it is possible to form an in-phase inductor exhibiting extremely high magnetic coupling characteristics while ensuring sufficient dielectric strength between the conductors.

Further, in the second claim, the linear or meandering conductor is surrounded by the non-magnetic insulator, further surrounded by the magnetic body, and is sintered integrally with the magnetic body. By providing film-like electrode terminals connected to the conductors on the end faces of the body, even when used in harsh environments, it can sufficiently prevent moisture from entering and prevent short circuits between the conductors. Alternatively, it is possible to form an in-phase inductor that has extremely advantageous magnetic coupling in terms of characteristics while preventing the increase in direct current resistance and disconnection of the conductor itself due to migration or corrosion.

Further, in the 32nd claim, claim (1).

Since the non-magnetic insulator part in (2) is made of zinc-based non-magnetic ferrite, it can exhibit almost the same thermal behavior as the magnetic material, making it a stable and highly reliable in-phase inductor that is integrally sintered with different materials. It becomes possible to form
The present invention relates to a configuration of an in-phase inductor that prevents the drawbacks of the conventional technology and improves industrial economy.

[Embodiment] Next, an embodiment of an in-phase inductor according to the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of a first embodiment of the in-phase inductor according to the present invention. For simplicity, the configuration is shown for one piece rather than a connected one, and a part of the conductor is shown with emphasis. There is.

In Fig. 1, conductors 23 and 24 are arranged through non-magnetic insulators 25 and surrounded by magnetic bodies 21, thereby ensuring sufficient dielectric strength between the conductors and magnetically very strong conductors. It is possible to form a common-mode inductor that exhibits high coupling characteristics.

FIG. 2 shows a second embodiment of the in-phase inductor according to the present invention, and for simplicity, the configuration is shown for one piece instead of a connected one, and a part of the conductor is shown with emphasis.

In FIG. 2, the conductors 33 and 34 are surrounded by a non-magnetic insulator 35, and the non-magnetic material is further surrounded by a magnetic material 31, so that the conductor can be used in even harsher environments.

Sufficiently prevents the entry of moisture, etc., and prevents short circuits between the conductors, or increases in DC resistance of the conductors themselves due to migration, corrosion, etc., and disconnection.
In terms of characteristics, it is also possible to form an in-phase inductor with very advantageous magnetic coupling.

3 to 5 explain the configuration of FIG. 1 in more detail.

In FIG. 3, a conductor 43 is placed on the lower magnetic sheet 41 of the upper and lower insulating magnetic sheets 41 and 42, which are produced by mixing ferrite magnetic powder and a suitable binding resin in a raw state, such as Ag or Ag alloy base. 45 non-magnetic insulators are firstly formed into 44 conductors using a similar method, and finally an upper magnetic sheet is formed using a high melting point metal paste. 42, except for the ends of the conductors 43 and 44, to form a closed magnetic circuit laminate as shown in FIG.

Next, after the laminate is integrally sintered at an appropriate temperature, film-shaped electrode terminals 66A, 66B, and 67A are connected to the end surfaces of the conductor, respectively.

By providing 67B by baking or plating as shown in Fig. 5, '1s' is suitable for surface mounting in electronic circuits.
An in-phase inductor capable of handling the high frequency band of the equivalent model shown in FIG. Even when used in harsh environments, it is possible to construct a high-performance in-phase inductor with extremely advantageous magnetic coupling while fully satisfying the functions of an electronic component, eliminating the drawbacks of conventional technology. It can be said that the industrial benefits are extremely large in that the present invention provides a surface-mounted common-mode inductor that can improve industrial economic efficiency and is compatible with high frequency bands.

Finally, in the configuration of the present invention, the magnetic material.

The conductor and the non-magnetic insulator are formed by a printing method or a coating method.

Dr.Frede method, extrusion molding method, injection molding method, etc.
I would like to add a note here just to be sure that no matter what manufacturing method is used to form the structure, there is no change in the effect for the purpose of this structure.

21... Insulating magnetic material, 23.24... Conductor, 25
...Nonmagnetic insulator, 66A, B, 67A, B... Electrode terminal.

[Brief explanation of the drawing]

1 and 12 are cross-sectional views of the first and second embodiments of the present invention, FIG. 3 is an exploded perspective view of the first embodiment of the present invention, and FIGS. 4 and 5 are sectional views of the first embodiment of the present invention. FIG. 6 is a perspective view showing the attachment of electrode terminals in the embodiment, FIG. 6 is a conceptual diagram showing an equivalent model, and FIG. 7 is a sectional view of a conventional in-phase inductor.

Claims (1)

[Scope of Claims] 1) A laminate body including a plurality of conductors spaced apart from each other and facing each other and a non-magnetic insulator interposed between the plurality of conductors. An in-phase device characterized by having an insulating magnetic material covering the main body of the laminated part, and a plurality of electrode terminals provided on the outer surface of the insulating magnetic material and electrically connected to each of the plurality of conductors. type inductor. 2) A laminate main body including a plurality of conductors spaced apart from each other and facing each other and a non-magnetic insulator including the plurality of conductors. An in-phase type characterized by having an insulating magnetic material covering the main body of the laminated part, and a plurality of electrode ends provided on the outer surface of the insulating magnetic material and electrically connected to each of the plurality of conductors. Indax. 3) The in-phase inductor according to claim 1 or 2, wherein the non-magnetic insulator includes a zinc-based non-magnetic ferrite.