JPH0245358B2 - SHIIRUDOGATAFUKUGOBUHIN - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shielded composite component, and more particularly to a shielded composite component formed by integrally forming a shielded inductor and a capacitor.

The inductor portion of a composite component including an inductor with an air-core or low-magnetic core serves as an open magnetic path type inductor with good linearity and direct current superimposition characteristics, but the distance range affected by its leakage flux is large. Therefore, mounting such inductors on highly integrated printed wiring boards requires the use of a separate high-permeability metal case or sufficient separation from other circuit components, making it difficult to integrate composite components. There were inconveniences in miniaturization and high integration.

The present invention solves this problem by providing a composite component that includes a highly integrated, compact, shielded open magnetic path inductor and also integrally includes a capacitor. The composite component of the present invention is a composite component including L and C, and can be applied to, for example, a bandpass filter.

The composite part of the present invention can be formed by overlapping an inductor part and a capacitor part. For example, each part is formed in advance by a lamination method, sintered, and then glued with a suitable adhesive (glass etc.). After overlapping, the two can be integrally joined by baking. Alternatively, it is also possible to perform the lamination of each part as an integrated process and then perform high-temperature firing.

The inductor part includes an internal magnetic body, a non-magnetic insulator surrounding it, an external magnetic body completely surrounding the magnetic body, and a thin film linear conductor that surrounds the internal magnetic body in the insulation. It has an integral structure consisting of. The internal magnetic material is determined by the desired characteristics of the inductor, and may be replaced with a non-magnetic material. Furthermore, the term "inductor" here refers to at least one inductor, including a transformer. In the following embodiment, an example will be described in which a transformer is configured with two inductors.

According to the present invention, it is possible to provide a small, shielded, and mechanically strong composite component that does not require a metal case.

The composite part of the present invention can be manufactured by laminating each part in an appropriate order using, for example, a screen printing method. The manufacturing method for inductors (including transformers) is known from U.S. Pat. The insulator layer is formed from an insulator powder paste, the dielectric is formed from a dielectric powder paste, and the conductor is formed from a metal powder paste by printing. Further, the external terminals shall be formed by low-temperature baking of a suitable conductor.

1 to 29 are plan views showing the lamination process of an inductor portion (transformer) of a shield type composite component according to an embodiment of the present invention, and FIG. 30 is a sectional view of the fired laminate. First, a magnetic layer 1 is formed as shown in FIG. On top of that, a slightly smaller insulator layer 2 is printed as shown in FIG. The inner magnetic layer 3 and the outer magnetic layer 4 are printed as shown in FIG. 3 so that a part of the insulating layer 2 remains in an annular shape. Fourth
As shown in the figure, in order to form a first coiled conductor, a conductor 5 having a lead-out end F _S is connected to an inner magnetic layer 3.
Print so that it extends above. Moving to the step shown in FIG. 5, a ring-shaped insulating layer 6 is printed so as to overlap the lower insulator, and inner and outer magnetic layers 7 and 8 are printed as shown in FIG. 6. Here, the magnetic layer 7 is only on the left half. As shown in FIG. 7, after printing approximately half a turn of the conductor 9 connected to the conductor 5, the eighth
As shown in the figure, the insulator layer 10 is printed so as to overlap with the lower insulator, and the inner and outer magnetic layers 11 and 12 are further printed as shown in FIG. At this time, the magnetic layer 11 is only on the right half. About half a turn of the conductor 13 is printed extending from one end of the conductor 9 as shown in FIG. 10, then an insulating layer 14 is printed as shown in FIG. Then, as shown in FIG. 13, a conductor 17 having a lead-out end _F
Print on one end of the page. As described above, the conductor 5,
It can be seen that 9, 13, and 17 form a coiled conductor (primary coil) that goes around from one layer to another of the magnetic layers.

After printing the insulating layer 18 in the same manner as shown in FIG. 14, the inner and outer magnetic layers 19,
Print 20. Hereinafter, in exactly the same manner as in Figs. 4 to 15, the steps shown in Figs. coil).
That is, the _thin film conductor 21 (16th
Figure, insulator layer 22 (Figure 17), inner and outer magnetic layers 2
3, 24 (Fig. 18), conductor 25 (Fig. 19), insulator layer 26 (Fig. 20), inner and outer magnetic layers 27, 2
8 (Fig. 21), a conductor 29 (Fig. 22), an insulating layer 30 (Fig. 23), an inner and outer magnetic layer 31, 32 (Fig. 24), a conductor 33 having a lead-out end S _F (Fig. 25).
), insulating layer 34 (FIG. 26), magnetic layer 35,
36 (FIG. 27) and an insulator layer 37 (FIG. 28) are printed in this order. Conductors 21, 25, 29, 33
It can be seen that forms a coiled conductor (secondary coil) from the starting end S _S to the ending end S _F. Finally, the second
The lamination of the inductor portion (transformer) is completed by forming a magnetic layer 38 on the top as shown in FIG. As shown in Fig. 30, this laminate consists of primary and secondary coil conductors A ₁ and A ₂ , an internal magnetic body B filling the periphery, an insulator C formed on the outer periphery, and further formed on the outer periphery. It consists of an external magnetic body D.

Next, as shown in FIG. 31, a glass layer 39 of glass powder paste is printed on layer 38.
This layer acts as an adhesive and a standoff to bond the layers above and below. A dielectric layer 40 is formed thereon as shown in FIG. 32, and a pair of electrode conductor layers 41 and 42 are further formed as shown in FIG.
Pull out T ₁ and T ₂ to the side. A dielectric layer 43 is formed as shown in FIG.
Electrode conductor layers 44 and 45 are formed to overlap above. At this time, the pull-out ends T ₃ and T ₄ are pulled out to the sides. As shown in FIG. 36, a dielectric layer 46 is formed on the top to complete the lamination of the capacitor portion.

The composite laminate thus obtained is placed in a firing furnace and fired to form an integrated composite laminate. As shown in FIG. 37, the terminals F _S exposed on the periphery, external terminals 49, F _F for T ₁ , external terminals 48, S _F for T ₃ ,
The external terminal 49 for T ₂ and the external terminal 50 for S _S and T ₄ are baked and formed to complete the composite component of the present invention. This part has the circuit configuration shown in FIG.
Can be used as a bandpass filter, etc.

Alternatively, the laminates shown in FIGS. 1 to 30 and the laminates shown in FIGS. 32 to 36 are fired separately to produce sintered bodies for the transformer part and the capacitor part, respectively, and a sintered body is placed between them. A glass layer as shown in FIG. 31 may be interposed, the two may be bonded together by firing at a relatively low temperature, and finally external terminals may be provided as shown in FIG. 37.

With the above configuration, the magnetic flux leaking from the internal magnetic body of the inductor portion (transformer in this case) is shielded by the magnetic body D on the outer periphery. In addition,
The inner magnetic body B can be made from a raw material selected from ferrite powders of various magnetic permeabilities according to the design constants of the transformer, and the outer magnetic body D can be made from a raw material of ferrite powders with high magnetic permeability.

It will be apparent to those skilled in the art that many variations are possible within the scope of the invention.

[Brief explanation of the drawing]

1 to 29 are plan views showing sequential steps for manufacturing a transformer portion of a shielded laminated composite component according to an embodiment of the present invention, FIG. 30 is a sectional view of the laminated transformer portion, and FIG. 31 or the 36th
37 is a perspective view of the completed laminated transformer, and FIG. 38 is a circuit diagram of the laminated transformer. The main parts in the figure are as follows. 1, 38: magnetic layer, 3, 7, 11, 15, 1
9, 23, 27, 31, 35: internal magnetic layer,
4, 8, 12, 16, 20, 24, 28, 32,
36: External magnetic layer, 2, 6, 10, 14, 1
8, 22, 26, 30, 34, 37: insulator layer,
F _S , F _F , S _S , S _F : Pull-out end, 39 : Glass layer, 4
0, 43, 46: dielectric layer, 41, 42, 44,
45: Conductor layer for electrode, 47, 48, 49, 5
0: External terminal.

Claims (1)

[Claims] 1. An internal magnetic body, a non-magnetic insulator that integrally surrounds it, and an external magnetic body that further surrounds it,
A shielded composite component comprising an inductor part made of at least one conductor circulating in the internal magnetic body, and a capacitor part superimposed and integrated with the inductor part.