JPH05326271A - Composite inductor part - Google Patents

Abstract

PURPOSE:To enhance noise removing capability by giving high impedance to an inductance part without preventing miniaturization or high concentration mounting. CONSTITUTION:A ferrite layer and an internal electrode layer are mutually laminated and a current passes through each internal electrode layer in order to form a plurality of inductor parts 2 (2a, 2b) in a condition of a coil shape. As each of the inductor parts 2 (2a, 2b) mutually adjoining is located on two mutually different planes inside a ferrite laminated body 1, the plurality of inductor parts 2 (2a, 2b) are arranged alternatively one by one on the different plane and also a plurality of external electrodes 3 electrically connected to each of the inductor parts 2 (2a, 2b) are formed outside the ferrite laminated body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductor component, and more particularly, to a composite inductor component in which a plurality of inductor parts are arranged in a ferrite laminate.

[0002]

2. Description of the Related Art Conventionally, as a noise elimination interface (noise elimination filter element) used for an interface line of OA equipment such as a computer, for example,
A composite inductor component as shown in FIG. 5 is used. This composite inductor component has a strip-shaped straight internal electrode (straight internal electrode) between the layers of a ferrite laminate 51 formed by laminating a plurality of ferrite layers so that the mounting area can be reduced and high-density mounting can be performed. electrode)
Integral firing type formed by arranging a plurality of 52 (4 in this conventional example) and arranging a plurality of external electrodes 53 electrically connected to the respective straight internal electrodes 52 outside the ferrite laminate 51. Is a composite inductor component of.

[0003]

However, in the above-mentioned conventional composite inductor component, the internal electrodes (straight internal electrodes) 52 disposed between the layers of the ferrite laminate 51 are provided.
Has a strip shape and is formed in a straight shape, so that high impedance cannot be obtained and a sufficient noise removing effect cannot be obtained.

The present invention solves the above-mentioned problems, and it is possible to obtain a high impedance without hindering the miniaturization and the high density of mounting (surface mounting) by it, and it is possible to obtain an excellent noise removing effect. It is an object of the present invention to provide a composite inductor component having the above.

[0005]

In order to achieve the above object, the composite inductor component of the present invention has a ferrite laminate in which ferrite layers and internal electrode layers are alternately laminated and each internal electrode layer is electrically connected. Is a composite inductor component formed by forming a plurality of coil-shaped inductor parts inside a plurality of inductor parts such that adjacent inductor parts are located on two different planes inside the ferrite laminate. The parts are alternately arranged on different planes, and a plurality of external electrodes electrically connected to the respective inductor parts are formed outside the ferrite laminate.

[0006]

Since the plurality of inductor portions are arranged on two planes inside the ferrite laminate so that the adjacent inductor portions are located on mutually different planes, the product can be miniaturized and mounted. Higher density is possible, and
Since each inductor part is formed in a coil shape, high impedance can be obtained, and
By changing the number of turns of the coil, the impedance characteristic can be adjusted, the degree of freedom in design is improved, and noise can be effectively removed.

Further, since the adjacent inductor portions are located on different planes, the distance between the adjacent inductor portions can be increased as compared with the case where the inductor portions are arranged on the same plane. Therefore, it is possible to suppress the porcelain coupling and the capacitive coupling, improve the crosstalk characteristics, prevent noise and signals from jumping to other inductor portions, and improve the reliability of signal transmission.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view showing a composite inductor component according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing a manufacturing method thereof.

In the composite inductor component of this embodiment, as shown in FIG. 1, a plurality of (four in this embodiment) inductor portions 2 formed by forming the internal electrode layers 12 (FIG. 2) in a coil shape. (2a, 2b) is the ferrite layer 11,
21 (FIG. 2) are arranged inside the ferrite laminated body 1, and outside the ferrite laminated body 1 via the extraction electrode portion 13, each of the inductor portions 2 (2
A plurality of external electrodes 3 that are electrically connected to a, 2b) are provided.

The inductor section 2 is arranged so that the inductor sections 2a and 2b adjacent to each other are located on two mutually different planes inside the ferrite laminate 1.
They are arranged one by one on different planes. In addition,
In FIG. 1, the inductor section 2a shows the inductor section 2 arranged on one plane, and the inductor section 2b
Shows the inductor section 2 arranged on the other plane.

Next, a method of manufacturing this composite inductor component will be described with reference to FIG. First, a conductor pattern (internal electrode layer) 12 is arranged at a position where the inductor portion 2 (2a) (FIG. 1) of a plurality of ferrite sheets (ferrite layers) 11 having through holes 14 formed at predetermined positions is to be formed. By doing so, the first ferrite sheet group 11a is formed. In addition, among the conductor patterns 12 of the ferrite sheet group 11a, the conductor patterns 12 of the uppermost layer and the lowermost layer
Extraction electrode portions 13 are integrally formed on a and 12b, respectively.

Then, the inductor portion 2 of the plurality of ferrite sheets (ferrite layers) 21 is formed by the same method.
(2b) The second ferrite sheet group 21a is formed by disposing the conductor pattern (internal electrode layer) 12 at a predetermined position where the (2) (FIG. 1) should be formed. The conductor pattern (internal electrode layer) 12 can be formed, for example, by printing an unbaked ferrite green sheet with a conductive paste so as to form a predetermined pattern.

A ferrite sheet 16 having no conductor pattern is inserted between the thus formed ferrite sheet groups 11a and 21a, and a ferrite sheet having no conductor pattern is further formed from both upper and lower sides. A coil pattern (inductor) having a predetermined number of turns (several turns) is formed by stacking and crimping 15 and connecting the conductor patterns 12 formed on the respective ferrite sheets 11 and 21 through the through holes 14. Part) 2 (2a, 2b) is formed. next,
A block in which a plurality of such units are formed is cut at a predetermined position and fired.

Then, the fired ferrite laminate 1
By forming a plurality of external electrodes 3 which are electrically connected to the inductor portion 2 (2a, 2b) via the lead electrode portion 13 on the outer side of, the composite inductor component as shown in FIG. 1 is formed. The external electrode 3 can be formed, for example, by printing and baking a conductive paste that is the same as or different from that used to form the internal electrode layer 12, or by plating or vapor deposition. It can be formed by other methods.

In the composite inductor component formed as described above, the plurality of inductor parts 2 (2a, 2b) are arranged such that the adjacent inductor parts 2 (2a, 2b) are located on mutually different planes. Since it is arranged, the product can be downsized and the packaging density can be increased. Further, since each inductor portion 2 (2a, 2b) is formed in a coil shape, high impedance can be obtained, and impedance characteristics can be adjusted by changing the number of turns of the coil, so that noise can be reduced. It can be effectively removed.

Further, adjacent inductor portions 2 (2a, 2a,
2b) are located on different planes, the distance between the adjacent inductor sections 2 (2a, 2b) is larger than that when the inductor sections 2 (2a, 2b) are arranged on the same plane. Therefore, it is possible to suppress porcelain coupling and capacitive coupling to improve crosstalk characteristics, prevent noise and signals from jumping to other inductor portions, and improve reliability of signal transmission.

In the above embodiment, the composite inductor component in which four inductor parts are arranged has been described, but the number of inductor parts to be arranged is not particularly limited.
It is possible to increase or decrease the number according to the usage conditions and applications. Further, in the above embodiment, as shown in FIG.
When viewed from above, a plurality of inductor parts 2 (2a, 2
Although the case where b) is arranged so as to be aligned in a straight line has been described, the inductor portion does not necessarily have to be arranged in a straight line, and for example, as shown in FIG. 4, the inductor portion 2 (2a, 2b) It is also possible to arrange the zigzags in this case. In this case, each inductor portion 2 (2a, 2
It becomes possible to increase the distance between b).

Further, there is no particular restriction on the shape or the number of turns (the number of turns) of the coil pattern constituting the inductor portion, and a preferable shape or the number of turns can be selected in consideration of usage conditions or applications.

Further, it is possible to add various applications to the materials and shapes of the ferrite layer, the internal electrode layers, the external electrodes, etc. as long as the effects of the present invention are not impaired.

[0020]

As described above, in the composite inductor component of the present invention, the adjacent inductor portions are different from each other.
A plurality of inductor sections are arranged alternately on different planes so that they are located on one plane, and a plurality of external electrodes that conduct with each inductor section are formed outside the ferrite laminate. As a result, it is possible to obtain high impedance characteristics without hindering miniaturization and high packaging density, and also to obtain desired impedance characteristics by changing the number of turns of the coil to effectively remove noise. You can

Further, since the distance between the adjacent inductor portions can be made large, it is possible to suppress the porcelain coupling and the capacitive coupling, improve the crosstalk characteristics, and improve the reliability of signal transmission.

[Brief description of drawings]

FIG. 1 is a perspective view showing a composite inductor component according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a method of manufacturing a composite inductor component according to an embodiment of the present invention.

FIG. 3 is a plan view showing a composite inductor component according to an embodiment of the present invention.

FIG. 4 is a plan view showing a composite inductor component according to another embodiment of the present invention.

FIG. 5 is a perspective view showing a conventional composite inductor component.

[Explanation of symbols]

 1 Ferrite Laminated Body 2 Inductor Section 2a Inductor Section 2b Formed on One Plane 2 Inductor Section Formed on the Other Plane 3 External Electrodes 11,21 Ferrite Layer (Ferrite Sheet) 12 Internal Electrode Layer 13 Extraction Electrode Section

Claims (1)

[Claims] 1. A composite inductor component in which a plurality of coil-shaped inductor portions are formed inside a ferrite laminate by alternately stacking ferrite layers and internal electrode layers and electrically connecting the internal electrode layers. A plurality of inductor portions are alternately arranged on different planes so that the inductor portions adjacent to each other are located on two different planes inside the ferrite laminate, and A composite inductor component, characterized in that a plurality of external electrodes that are electrically connected to the respective inductor parts are formed on the outside.