JPH06215946A - Chip type multilayer inductor - Google Patents

Abstract

PURPOSE:To provide a multilayer inductor in which the occurrence of 'opening' due to sintering is restrained. CONSTITUTION:In a multilayer inductor obtained by laminating a plurality of magnetic body sheets and conductor patterns interposed between, the conductor pattern 11 is printed on the surface of the magnetic sheet 14 with the end part being forked and extending along the adjacent edge while sandwiching the magnetic sheet 14 at a corner thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductor, and more particularly to a chip type laminated inductor in which a magnetic sheet and a conductive pattern are laminated.

[0002]

2. Description of the Related Art Conventional chip type multilayer inductors (hereinafter referred to as
As shown in FIG. 4, the laminated inductor has three magnetic material sheets 41, 42, and 43, and two conductor patterns 44 and 45 arranged between these magnetic material sheets, respectively. There is.

The conductor patterns 44 and 45 have a shape shown in FIG. 5, for example, and are formed by printing on the surface of any of the magnetic sheets 41, 42 and 43. FIG. 5 shows the conductor pattern 44 formed on the magnetic sheet 41.

The end portion 51 of the conductor pattern 44 (45) is
When the magnetic sheet having the conductor pattern is laminated, the magnetic sheet is formed along the edge of the magnetic sheet 41 (42 or 43) at the corners of the magnetic sheet 52 so as to be exposed from the side surface of the laminated body.

To be precise, a large number of conductor patterns are arrayed and formed on one magnetic material sheet, and they are cut out as individual laminated inductors after lamination. Therefore, when forming the conductor pattern, it is not always necessary that the end portion is formed along the edge of the sheet, and if the end portion of the conductor pattern is cut along the edge of the magnetic sheet as a result of being cut out. good.

[0006]

The conventional laminated inductor is very small, and in order to connect the conductor pattern and the external terminal easily and surely, the conductor pattern is exposed at the four corners of the laminate. Is desirable. However, if the conductor pattern is exposed at the corners of the laminate in this way, "opening (delamination)" occurs due to the difference in contraction stress between the magnetic sheet and the conductor pattern when sintering is performed. There is a problem in that (laminated sheets are easily peeled off) and “cracking” occurs.

An object of the present invention is to provide a laminated inductor in which "opening" due to sintering is suppressed.

[0008]

According to the present invention, a plurality of magnetic material sheets and a conductor pattern having a plurality of end portions and arranged between the plurality of magnetic material sheets are provided. In a laminated inductor in which a part is laminated so as to be exposed to the outside from a side surface of the laminated body, a specific end of the plurality of ends is branched into two or more to form a plurality of tips, and a plurality of tips are formed. The two tips are two side surfaces adjacent to each other of the laminated body, and are arranged so as to be exposed on the side surfaces excluding the corners formed by the two side surfaces, and the specific end among the plurality of end portions. A chip-type laminated inductor is obtained in which an end portion other than a portion and a tip other than the two tip ends of the plurality of tip portions are arranged to be exposed from a side surface of the laminated body excluding a corner.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a conductor pattern 11 used in one embodiment of the present invention. The conductor pattern 11 has a meandering portion 12 and an end portion 13, and the tip of the end portion 13 is bifurcated. As in the conventional case, this conductor pattern is printed on the surface of the magnetic sheet 14. At this time, the tip of the end portion 13 is formed on two adjacent edges at the distances L1 and L2 from the corner of the sheet 14, respectively. It is formed along.

FIG. 2 shows a first embodiment of the present invention. The laminated inductor of this embodiment has the conductor pattern 11 shown in FIG.
Magnetic sheet 21 on which a and 11b are formed by printing
22 and 22 and a magnetic material sheet 23 on which a conductor pattern is not printed. Conductor patterns 11a, 1
The ends of 1b are two side surfaces adjacent to each other,
The tip is exposed on the side surface except the corners formed by these two side surfaces. That is, L1 and L2 are distant from the corner formed by two adjacent side surfaces, and the tip ends thereof are exposed.

As described above, in this embodiment, the conductor pattern is exposed on the side surfaces of the laminate except the corners and is not exposed on the corners, so that "opening" is unlikely to occur during sintering. Further, the position where the conductor pattern is exposed is substantially the same as that of the conventional one, and the connection of the external terminal can be performed easily and surely. Furthermore, because the end of the conductor pattern is bifurcated,
External terminals can be connected to either end, which increases the degree of freedom in design.

In the above embodiment, the conductor pattern 2
Although the two end portions are bifurcated, the present invention is not limited to this, and the end portions of the conductor pattern may be exposed on the side surfaces of the laminated body excluding the corners. For example, FIG.
As shown in FIG. 5, only the end portions arranged near the corners of the laminated body may be bifurcated. 3 (b) and 3 (c)
As shown in, it may be branched into two or more branches. further,
As shown in FIG. 3C, the tip may be exposed on three side surfaces of the laminated body.

[0013]

According to the present invention, in a laminated inductor in which a plurality of magnetic material sheets and a conductor pattern arranged between the plurality of magnetic material sheets are laminated, a specific end among the end portions of the conductor pattern is provided. The part is bifurcated, and the two tips are exposed at positions other than the corners formed by these two side surfaces of the two adjacent side surfaces of the laminated body, and the other tip and other end portions are laminated. By exposing the side surface of the body excluding the corners, it is possible to suppress the opening during sintering.

[Brief description of drawings]

FIG. 1 is a plan view of a conductor pattern used in an embodiment of the present invention.

FIG. 2 is a perspective view of an embodiment of the present invention.

FIG. 3 is a plan view of a conductor pattern used in another embodiment of the present invention, in which (a) shows an example in which only a specific end is branched into two, and (b) shows the end in three. A branched example is shown, and (c) shows an example in which one end is exposed on three side surfaces.

FIG. 4 is a perspective view of a conventional laminated common mode choke.

FIG. 5 is a plan view of a conductor pattern used in a conventional laminated common mode choke.

[Explanation of symbols]

 11 conductor pattern 12 meandering portion 13 end portion 14 magnetic sheet 41, 42, 43 magnetic material sheet 44, 45 conductor pattern 51 end portion

Claims (1)

[Claims] 1. A plurality of magnetic material sheets and a conductor pattern having a plurality of end portions and arranged between the plurality of magnetic material sheets, the plurality of end portions being exposed to the outside from a side surface of the laminated body. In the laminated inductor, a specific end of the plurality of ends is branched into two or more to form a plurality of tips, and two tips of the plurality of tips are adjacent to each other of the laminate. The two side faces are arranged so as to be exposed to the side faces except the corners formed by the two side faces, and the end portions other than the specific end portion among the plurality of end portions and the plurality of tip ends. A chip type multilayer inductor, characterized in that the two other tips are arranged so as to be exposed from the side surfaces of the multilayer body excluding the corners.