JPH0410674Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a chip-type LC composite component that is suitably used as an element constituting a resonant circuit or the like of various electronic devices.

BACKGROUND ART Conventionally, resonant circuits and the like have conventionally been assembled by using an inductor and a capacitor separately and electrically connecting them. However, in such a case, the number of parts is large, and the number of assembly steps is also increased, so there is a problem that assembly is time-consuming and increases costs.
Moreover, when assembling the inductor and capacitor individually in this way, there is a certain limit to miniaturization, and there is a problem that it is difficult to expect a significant improvement in packaging density.

On the other hand, there is a technology to manufacture LC composite parts using the printed lamination method, but when manufactured using this method, inductor conductors are connected across multiple sheets to form a spiral coil pattern. Therefore, stray capacitance is likely to occur between the conductors, resulting in another problem of poor high frequency characteristics.

The present invention was made to solve the above problem, and the inductor and capacitor are integrated,
The purpose is to provide a novel multilayer chip-type LC composite component having an equivalent circuit in which both are connected in parallel.

Means to Solve the Problems Therefore, the LC composite component of the present invention has a laminate of magnetic green sheets and dielectric green sheets integrally sintered to form a magnetic part and a dielectric part. In the LC composite component provided with external electrodes, the magnetic material section has a structure in which a plurality of magnetic green sheets are laminated, each having a conductive layer to be connected to the external electrodes at both ends, while the dielectric material section is characterized by a laminated structure of a dielectric green sheet with an internal electrode connected to one external electrode, and a dielectric green sheet with an internal electrode connected to the other external electrode.

Effect of the invention In the LC composite component having such a configuration, when a current is passed between both external electrodes, it flows through the conductive layer inside the magnetic body part, and the magnetic body part acts as an inductor, while the dielectric body part acts as an inductor. Electric charge is accumulated in the internal electrode of the dielectric, and the dielectric portion acts as a capacitor. Then, both external electrodes serve as a common electrode for the inductor and capacitor, and the two are connected in parallel to form an LC composite circuit.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of an LC composite component according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line 1-2. The magnetic body part 11 is made of a magnetic material such as , and the dielectric part 12 is made of a dielectric material such as barium titanate or titanium oxide. The main body 1 is constructed by integrally sintering a laminate of a magnetic green sheet and a dielectric green sheet to form a magnetic part 11 and a dielectric part 1, as described later.
2 are integrally formed.

External electrodes 2 are provided at both longitudinal ends of this main body 1.
2' is formed, and inside the magnetic body part 11, a plurality of conductive layers 3 are formed whose both ends are electrically connected to both external electrodes 2 and 2'. Further, inside the dielectric part 12, an internal electrode 4 connected to one external electrode 2 is provided.
and internal electrodes 4' connected to the other external electrode 2' are alternately formed to face each other. Therefore, for example, when a high frequency current is passed between both external electrodes 2 and 2', the magnetic body part 11 acts as an inductor,
The dielectric portion 12 acts as a capacitor. Both external electrodes 2, 2' serve as common electrodes for the inductor and capacitor, and as shown in FIG. 3, they constitute an equivalent circuit (however, the resistor is omitted) in which they are connected in parallel.

Such LC composite parts are manufactured, for example, by the following method. First, in order to form the conductive layer 3, a plurality of magnetic green sheets 111 whose surfaces are printed with Pd or Ag-Pd paste, etc., a simple magnetic green sheet 112, and internal electrodes 4, 4' are formed. For this reason, dielectric green sheets 121 on which the above paste has been printed in advance and simple dielectric green sheets 122 are laminated in appropriate numbers as shown in the figure, hardened with a press, and then sintered as a single piece to create magnetic properties. A main body 1 consisting of a body part 11 and a dielectric part 12 is obtained. At this time, the paste printed on the surface of the green sheet is baked to form the conductive layer 3 and internal electrodes 4, 4'.
Next, the external electrodes 2 and
2' to obtain an LC composite part. Note that the conductive layer 3 and internal electrodes 4, which should be connected to the external electrodes 2, 2',
Since the respective ends of 4' are exposed on both end faces of the main body 1, they are connected simultaneously with the formation of the external electrodes 2, 2'. Furthermore, as for the metal material of the conductive layer 3 of the magnetic part 11 and the internal electrodes 4, 4' of the dielectric part 12, base metals such as Ni and Pb can be used instead of the noble metals as in the above embodiments. . In this case, the manufacturing method for the LC composite part is one that is suitable for the metal material.

Since the LC composite part of the present invention is manufactured as described above, for example, the magnetic green sheet 11
1,112 layers and dielectric green sheet 1
The thickness ratio of the magnetic body part 11 and the dielectric body part 12 can be changed by appropriately adjusting the number of laminated sheets 21 and 122, or the magnetic green sheet 1 on which the conductive layer 3 is printed.
The number of conductive layers 3 and internal electrodes 4, 4' can be changed by appropriately increasing or decreasing the number of laminated dielectric green sheets 121 on which 11 and internal electrodes 4, 4' are printed, or by laminating magnetic green sheets 111, 112. By changing the arrangement and stacking arrangement of the dielectric green sheets 121 and 122, the mutual spacing between the conductive layers 3 and the internal electrodes 4,
It goes without saying that the reactance characteristics can be changed or adjusted as appropriate by increasing or decreasing the mutual spacing between the electrodes 4' or by appropriately changing the printed patterns of the conductive layer 3 and the internal electrodes 4, 4'.

Effects of the invention As is clear from the above explanation, the LC of this invention
With composite components, an LC circuit with an inductor and capacitor connected in parallel can be obtained on a single chip, so compared to the conventional circuit assembly using inductors and capacitors individually, the circuit size is much faster. It becomes possible to achieve miniaturization and high packaging density, and the number of assembly steps is also significantly reduced, making it possible to save labor and reduce costs. Moreover, since it is a laminated chip type,
As mentioned above, it is easy to change and adjust the reactance characteristics, and it is also possible to provide desired reactance characteristics depending on the application.

In addition, the magnetic material part has a structure in which multiple magnetic green sheets are laminated, each having a conductive layer connected to external electrodes at both ends.
Since the configuration is connected in parallel between two external electrodes,
1 by laminating multiple conventional magnetic green sheets
This prevents the coil pattern from having stray capacitance at every minute distance, as in the case of a configuration in which two spiral coil patterns are formed, and therefore it is possible to provide an LC composite component with excellent high frequency characteristics.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an LC composite component according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG. 3 is an equivalent circuit diagram of the LC composite component. DESCRIPTION OF SYMBOLS 1... Main body, 2, 2'... External electrode, 3... Conductive layer, 4, 4'... Internal electrode, 11... Magnetic body part,
12... Dielectric part, 111, 112... Magnetic green sheet, 121, 122... Dielectric green sheet.

Claims (1)

[Scope of Claim for Utility Model Registration] In an LC composite part in which external electrodes are provided at both ends of a main body in which a magnetic part and a dielectric part are formed by integrally sintering a laminate of a magnetic green sheet and a dielectric green sheet. , the magnetic material part has a structure in which a plurality of magnetic green sheets having conductive layers to be connected to the external electrodes at both ends are laminated, while the dielectric material part has an internal electrode connected to one external electrode. An LC composite component characterized in that it has a laminated structure of a dielectric green sheet having a dielectric green sheet and a dielectric green sheet having an internal electrode connected to the other external electrode.