JPH0523513U - Multilayer inductance component - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To eliminate the electromagnetic interference between the internal electrodes inside the laminated body, obtain a high impedance value, and enhance the effect of EMI countermeasures. [Structure] Internal electrodes 5, 5'formed inside a laminated body 2 containing ferrite as a main component are through-hole conductors 6,
6 ', which are sequentially connected through the shield electrode 7,
7 is interposed. The end portions of the internal electrodes 5 and 5 are the laminated body 2
Connected to the external electrodes 1 and 1 formed on both end faces of the external electrodes 3, and the external electrodes 3 on the side surfaces of the laminate 2 on both sides of the shield electrodes 7 and 7,
3 has been done. By connecting the shield electrodes 7, 7 to the ground via the external electrodes 3, 3, it is possible to prevent the interference of the magnetic field generated between the adjacent internal electrodes 5, 5 '.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a laminated inductance component used for a line filter or the like, and more particularly to a laminated inductance component capable of preventing electromagnetic interference between internal conductors inside a laminated body and obtaining high impedance.

[0002]

[Prior Art]

 Various methods have been taken as measures against noise superimposed on signal lines of digital circuits and unnecessary high frequency electromagnetic field interference (EMI), but as a countermeasure against EMI of signal lines with a particularly weak ground and low impedance. A line filter using ferrite is effective. In recent years, as electronic devices have become smaller and lighter, the line filters, which are circuit components, have also been required to have smaller sizes and chips. As a material suitable for such a demand, a laminated inductance component using a laminated technique is used.

In this laminated inductance component, as shown in FIG. 4, layered internal conductors 5 and 5 ′ are stacked via a ceramic layer 4, and these internal conductors 5 and 5 ′ are as shown in FIG. Inside the laminate 2, the through-hole conductors 6, 6 ... Are sequentially connected so as to be reciprocated. As a result, the effective conductor length of the internal conductors 5 and 5'passing through the laminated body 2 made of ferrite is long. Then, the external electrodes 1 and 1 are formed at the end portions of the laminated body 2 from which both ends of the internal conductors 5 and 5 are drawn out. The appearance of this multilayer inductance component is as shown in FIG. 5, and is configured as a rectangular chip component having the same form as the multilayer capacitor.

[0004]

[Problems that the device is trying to solve]

 However, in the conventional laminated inductance component as described above, since the internal conductors 5 and 5'are connected in a reciprocating manner in the laminated body 2, the currents in the adjacent internal conductors 5 and 5'are opposite to each other. Becomes The magnetic fields generated by the currents flowing in the inner conductors 5 and 5'are generated in the opposite directions according to the so-called right-handed screw rule, so that the magnetic fields generated between the adjacent inner conductors 5 and 5'cancel each other. I will end up. For this reason, even if the effective conductor length of the inner conductor is increased, the impedance value eventually decreases, and the effect as an EMI countermeasure cannot be obtained. In view of the above problems, the present invention provides a laminated inductance component that eliminates electromagnetic interference between internal conductors inside a laminated body and can obtain a high impedance value.

[0005]

[Means for Solving the Problems]

 That is, according to the present invention, in order to achieve the above object, a laminated body formed by laminating ceramic magnetic material layers, an internal conductor formed between layers of the ceramic magnetic material layer, and an internal conductor formed in the laminated body are provided. In a laminated inductance component having a through-hole conductor connected in a reciprocating state and an external electrode formed on the surface of a laminate so as to be connected to the internal conductor, the internal conductor is interposed between the internal conductors and Provided is a laminated inductance component having a shield electrode which is not electrically connected and an external electrode for grounding which is formed on the surface of the laminate so as to be connected to the shield electrode.

[0006]

[Action]

 In the above-mentioned laminated inductance component, since shield electrodes are interposed between the inner conductors, connecting these shield electrodes to the ground via the outer electrodes prevents interference of magnetic fields generated between adjacent inner conductors. You can That is, the magnetic field generated when a current flows through the inner conductor induces a current in the shield electrode. If the current flowing in the inner conductor is a high frequency, that is, a frequency current that has the effect of removing EMI of ferrite, the current induced in the shield electrode flows on the surface of the shield electrode and escapes to the ground due to the skin effect. This can suppress magnetic interference between the inner conductors.

[0007]

【Example】

 Next, an embodiment of the present invention will be specifically described. The structure of the laminated inductance component according to the embodiment of the present invention will be described together with an example of a general manufacturing method thereof. As shown in FIG. 1, a magnetic ceramic green sheet 4 containing ferrite as a main component, A conductive paste such as Ag paste is screen-printed to form the internal conductors 5 and 5 '. In FIG. 1, the inner conductors 5 and 5'are all shown by dots. Of the internal conductors 5 and 5 ', the internal conductors 5 and 5 of the upper and lower green sheets 4 and 4 in FIG. 1 are formed so as to reach the edges of the green sheet 4 opposite to each other. Further, in FIG. 1, the internal conductor 5 ′ between them is formed only in the central portion of the green sheet 4, and does not reach the edge of the green sheet 4. Of the green sheets 4, 4, ... On which the inner conductors 5, 5'are printed, except for the green sheet 4 at the bottom, through holes are formed in advance at the positions located at the ends of the inner conductors 5, 5 '. Simultaneously with the printing of the internal conductors 5, 5 ', the through-hole conductors 6, 6 are printed in the through-holes.

Further, similarly, shield electrodes 7, 7 and through-hole conductors 6 ′, 6 ′ are formed on the other green sheets 4, 4. The shield electrodes 7 and 7 are formed except around the green sheets 4 and 4 and around the through-hole conductors 6'and 6 ', and parts of both sides thereof are drawn out to both side edges of the green sheet. ..

In this way, the green sheets 4, 4 ... With the inner conductors 5, 5 ', the shield electrodes 7, 7 and the through holes 6, 6'printed thereon are laminated in the order shown in FIG. That is, the green sheets 4, 4 on which the shield electrodes 7, 7 are printed are inserted between the green sheets 4, 4, ... On which the inner conductors 5, 5'are printed. In this case, the green sheets 4 and 4 having the inner conductors 5 and 5 ′ printed thereon and the green sheets 4 and 4 having the shield electrodes 7 and 7 printed thereunder have the through-hole conductors 6 and 6 ′, respectively. Make sure that the positions match vertically. Further, between the upper and lower green sheets 4 and 4 on which the inner conductors 5 and 5'are printed, the through-hole conductors 6 and 6 are alternately located near the other ends of the green sheets 4 and 4. Further, green sheets with nothing printed are laminated on each side of the green sheets 4, 4 ... On which the internal conductors 5, 5'and the shield electrodes 7, 7 are printed. Then, the green sheets 4, 4, ... Are pressure-bonded from both sides.

Next, after firing the laminated body 2, as shown in FIG. 2, conductive paste is applied to both end faces and both side faces of the laminated body 2 and baked to form the external electrodes 1 and 3. To do. FIG. 3 shows a cross section of the laminated inductance component thus completed. The external electrodes 1 and 1 formed on both end surfaces of the laminate 2 are connected to the portions of the inner conductors 5 and 5 led out to the end surfaces of the laminate 2, and although not shown, the external electrodes on both side surfaces are also connected. The electrodes 3 and 3 are connected to the portions of the shield electrodes 7 and 7 which are led out to the side surfaces of the laminated body 2 on both sides. The inner conductors 5 and 5'are sequentially connected via the through-hole conductors 6 and 6 ', and the shield electrodes 7 and 7 are interposed therebetween.

Such a laminated inductance component is used by connecting the external electrodes 1 and 1 at both ends of the laminated body 2 to the signal line and connecting the external electrodes 3 and 3 on the side surfaces to the ground. In addition, in FIG. 1, the stacking order of the green sheets for each of the laminated inductance components is shown. The general manufacturing method is firing and firing.

Next, the embodiment of FIG. 7 will be described. In the embodiment, both sides of the shield electrodes 7, 7 are drawn to both side edges of the green sheets 4, 4, ... In contrast to the connection to the electrodes 3 and 3, in the embodiment of FIG. 7, through holes are formed on both sides of all the laminated green sheets 4, 4, ... The shield electrodes 7, 7 are connected by 8, 8 ... And the through-hole conductors 8, 8 are led out on both the upper and lower surfaces of the laminate 2. Then, as shown in FIG. 8, external electrodes 3, 3 are formed on both upper and lower surfaces and side surfaces of the laminated body 2 so as to be connected to the through-hole conductors 8, 8.

[0013]

[Effect of the device]

 As described above, according to the present invention, the electromagnetic interference between the inner conductors 5 and 5 ′ is prevented, a laminated inductance component having a high impedance value is obtained, and as a line filter for a so-called EMI countermeasure of a digital signal circuit, Highly effective.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a manufacturing example of a laminated inductance component of the present invention.

FIG. 2 is a perspective view showing an example of the appearance of a laminated inductance component of the present invention.

FIG. 3 is a cross-sectional perspective view showing an example of the internal structure of the laminated inductance component of the present invention.

FIG. 4 is an exploded perspective view showing a manufacturing example of a conventional laminated inductance component.

FIG. 5 is a perspective view showing an example of the appearance of a conventional laminated inductance component.

FIG. 6 is a cross-sectional perspective view showing an example of the internal structure of a conventional laminated inductance component.

FIG. 7 is an exploded perspective view showing another example of manufacturing the laminated inductance component of the present invention.

FIG. 8 is a perspective view showing another example of the appearance of the laminated inductance component of the present invention.

[Explanation of symbols]

 1 External Electrode 2 Laminated Body 3 External Electrode 4 Green Sheet 5 Inner Conductor 5'Internal Conductor 6 Through Hole Conductor 6'Through Hole Conductor 7 Shield Electrode

Claims (1)

[Reference number] 0030254-01 [Claims for utility model registration] 1. A laminated body formed by laminating ceramic magnetic material layers, an internal conductor formed between layers of the ceramic magnetic material layer, and a through-hole conductor in which these internal conductors are reciprocally connected in the laminated body. A laminated inductance component having an external electrode formed on the surface of the laminated body so as to be connected to the internal conductor, and a shield electrode interposed between the internal conductors and not electrically connected to the internal conductors. And a grounding external electrode formed on the surface of the laminated body so as to be connected to the shield electrode.