JPH04337913A - Chip-shaped noise removing filter - Google Patents

Abstract

PURPOSE:To provide a satisfactory chip-shaped noise removing filter without directivity, to facilitate the thinning/miniaturization of the chip shape in a chip- shaped noise removing filter which absorbs electromagnetic fault noise in the signal line of an electronic equipment and is suitable for loading to an image mounting printed circuit board. CONSTITUTION:A laminated body is constituted by overlapping a dielectric sheet 1 respectively forming conductors 2 on the front and rear sides, first magnetic substance sheet 4a forming a hole conductor 3 for electrically connecting the front and rear sides of a hole 5 provided on the center and second magnetic substance sheet 4b forming a conducting path 6 on the surface so as to be connected to the conductor 3, outside electrodes 7 are provided on both end faces of this laminated body, and a ground outside electrode 8 is provided on the outer periphery of the central part of the laminated body.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip-type noise removal filter that absorbs electromagnetic interference noise in signal lines of electronic equipment and is suitable for mounting on a surface-mounted printed circuit board.

0002

BACKGROUND OF THE INVENTION In recent years, surface-mounting of printed circuit boards has become more and more popular, and surface-mounting types of noise removal filter parts of this type have also been commercialized.

A conventional chip type noise removal filter will be explained below. FIG. 5 shows the configuration of a conventional chip-type noise removal filter. In FIG. 5, 21 is a concave ferrite core, and 22 is a chip capacitor, which is embedded in a recess of the concave ferrite core 21. 23 is a conductive piece that connects the electrode of the chip capacitor 22 and the conductor 25 provided on the concave ferrite core 21; 24 is an external electrode provided on both ends of the concave ferrite core; Conductor 25 through the through hole
A T-shaped circuit is formed by connecting the

0004

However, in the conventional configuration described above, since the chip capacitor 22 and the concave ferrite core 21 are combined, the external dimensions depend on the size of the chip capacitor 22, and it is difficult to make the component thinner and smaller. was difficult.

Furthermore, since the conductor 25 and the chip capacitor 22 are exposed on the surface, there is a problem in that the direction in which the ground electrode comes out cannot be provided in the same direction as the conductor 25 and the chip capacitor 22, and the directionality during mounting is restricted.

The present invention solves the above-mentioned conventional problems, and aims to provide a chip-type noise removal filter that can easily make the chip shape thinner and smaller, and has no restrictions on directionality during mounting. purpose.

[0007]

[Means for Solving the Problems] In order to achieve this object, the chip-type noise removal filter of the present invention includes a dielectric sheet having a conductor on each of its front and back surfaces, and a dielectric sheet provided with a conductor on each of the front and back surfaces, and a The first
A laminate is formed by overlapping a magnetic sheet and a second magnetic sheet having a conductive path on its surface so as to be connected to the hole conductor, and the second magnetic sheet is formed on both end surfaces of the laminate. In addition to providing external electrodes connected to both ends of the conductive path of the dielectric sheet, a ground external electrode connected to the conductor on the surface of the dielectric sheet is provided on the outer periphery of the center of the laminate.

[0008]

[Function] With this configuration, the chip shape can be easily made thinner and smaller, and it can also be mounted with either main surface of the stack facing up, so there is no directionality in the chip shape during mounting. A removal filter can be provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A chip type noise removal filter according to an embodiment of the present invention will be described below with reference to the drawings. Figure 1
1 is an exploded perspective view of a chip-type noise removal filter according to an embodiment of the present invention. FIG. 2 is a sectional view of the exploded state, FIG. 3 is a perspective view showing the external appearance, and FIG. 4 is an equivalent circuit.

In the figure, a conductor 2 for providing capacitance
An inductor is formed by forming an inductor with a dielectric sheet 1 having a dielectric sheet 1 formed on each of the front and back surfaces, and a first magnetic sheet 4a having a hole conductor 3 formed thereon to electrically connect the front and back surfaces to the inner wall of a hole 5 provided in the center. The second magnetic sheet 4b having a conductive path 6 formed on its surface so as to be connected to the conductor 3 is stacked on top of each other to form a laminate. External electrodes 7 connected to both ends of the conductive path 6 of the second magnetic sheet 4b are provided on both end faces of this laminate, and external electrodes 7 are provided on the outer periphery of the center of the laminate to be connected to the conductor on the surface of the dielectric sheet. A ground external electrode 8 is provided to form an LC composite component 9 shown in FIG.

The above dielectric sheet 1 and magnetic sheet 4
a and 4b are made of a dielectric or magnetic material and a binder plasticizer, and are formed into a sheet shape by a pulling method, etc., and the conductor 2, hole conductor 3, and conductive path 6 are made of a paste or ink such as silver or palladium. It is formed by printing or coating.

[0012]The first and second magnetic sheets 4a, 4
b are superimposed, and the above-mentioned dielectric sheet 1 is further superimposed thereon, and bonded by means such as heat compression bonding to form a laminate.

[0013]Then, by heating the laminate in a firing furnace, the organic binder such as the binder of the dielectric sheet 1 and the magnetic sheets 4a, 4b is removed and sintered. Thereafter, by forming the external electrode 7 and the ground external electrode 8 using silver paste or the like as shown in FIG. 3, it is possible to obtain a chip-type noise removal filter having the configuration shown in the equivalent circuit shown in FIG.

According to this embodiment, the chip type noise removal filter can be made thinner and smaller by forming L and C into sheets, and furthermore, the ground external electrode 8 is formed on the outer periphery of the laminate. Since it can be mounted with either main surface of the laminate facing up, the directionality during mounting is not restricted.

[0015]

[Effects of the Invention] As described above, according to the present invention, by forming a laminated composite of L and C, it is possible to easily reduce the thickness and size of the chip, and furthermore, it is possible to easily reduce the thickness and size of the chip. A chip-type noise removal filter can be provided.

[Brief explanation of drawings]

FIG. 1: An exploded perspective view of a chip-type noise removal filter in an embodiment of the present invention.

[Figure 2] Cross-sectional view of the same embodiment in an exploded state

[Figure 3] External perspective view of the same example

[Figure 4] Equivalent circuit diagram of the same example

[Figure 5] Exploded perspective view of a conventional chip-type noise removal filter

[Explanation of symbols]

1 Dielectric sheet 2 Conductor 3 Hole conductor 4a, 4b First and second magnetic sheets 5 Holes 6 Conductive path 7 External electrode 8 Ground external electrode 9 LC composite parts

Claims (1)

[Claims] 1. A dielectric sheet having a conductor provided on each of the front and back surfaces, a first magnetic sheet having a hole conductor formed on the inner wall of a hole provided in the center to electrically connect the front and back surfaces, 1
A second magnetic sheet having a conductive path on the surface so as to be connected to the hole conductor of the magnetic sheet is stacked to form a laminate, and the second magnetic sheet is attached to both end surfaces of the laminate. In addition to providing external electrodes connected to both ends of the conductive path,
A chip-type noise removal filter including a ground external electrode connected to the conductor on the surface of the dielectric sheet on the outer periphery of the center of the laminate.