JPH02256208A - Laminated chip coil - Google Patents

Abstract

PURPOSE:To effectively prevent inconvenience such as wire disconnection by connecting one ends of conductor patterns opposed through magnetic sheets to the other ends via a plurality of through holes. CONSTITUTION:A plurality of through holes 4,... passing along the thickness direction of magnetic sheets 2 are formed at one ends of conductor patters 3, and conductor layers are secured to the inner surfaces of the holes 4. Magnetic sheets 4 formed with external output conductor patterns 5 are laminated on the upper and lower sides of the laminate. That is, one ends and the other ends of the patterns 3 opposed through the sheets 2 to be laminated are connected via the holes 4,.... Thus, all the holes are not disconnected for wire disconnections, the one ends and the other ends of the patterns can be effectively connected to obtain a coil-like conductor passage.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a coil-shaped conductor path by laminating a plurality of magnetic sheets and connecting conductor patterns formed on each magnetic sheet to each other. The present invention relates to a multilayer chip coil comprising:

<Conventional technology> Conventionally, as an example of this type of laminated chip coil,
A device configured as shown in the exploded perspective view of the main part of the third leapfrog is known. This laminated chimp coil 20 includes a plurality of magnetic sheets 21. ... are laminated and pressed while being alternately rotated by 180° and then fired, and on the upper surface of each magnetic sheet 21, a U-shaped conductor pattern 22 is formed in a plan view. ing. A single through hole 23 is formed at one end of the conductor pattern 22, passing through each magnetic sheet 21 along its thickness direction. Therefore, in this laminated chip coil 20, the magnetic sheets 21 are alternately laminated, so that one end and the other end of each of the conductor patterns 22 facing each other with the laminated magnetic sheets 21 in between are through-holes. As a result of being connected to each other via the holes 23, a continuous coil-shaped conductor path is constructed.

Further, as another example of the laminated chip coil, there is a laminated chip coil 30 as shown in an exploded perspective view of a main part in FIG. This laminated chip coil 30 includes a plurality of magnetic sheets 31. ... are laminated and pressed while being alternately rotated by 180 degrees and then fired, and one end is formed through a single through hole 32 on each of the upper and lower surfaces of each magnetic sheet 31. Conductor patterns 33a and 33b are formed in a 5-shape in plan view, with the conductor patterns 33a and 33b connected to each other at the other end.

<Problems to be Solved by the Invention> By the way, the conventional laminated chip coils 20 and 30 have the following common problems. That is, as shown in FIG. 5, each magnetic sheet 21 (3
1), if the conductor layer 24 fixed to the inner peripheral surface of each of the through holes 23 (32) is thin, the conductor layer 24 will be damaged due to evaporation and diffusion of the conductor that occurs when firing the laminate. This results in an interruption, leading to inconveniences such as disconnections.

The present invention was devised in view of such conventional problems, and an object of the present invention is to provide a laminated chip coil that can reliably prevent the occurrence of inconveniences such as wire breakage.

Means for Solving the Problems> In order to achieve the above object, the present invention stacks a plurality of magnetic sheets each having a conductor pattern of a predetermined shape, and sandwiching each sort of magnetic material. This configuration employs a configuration in which one end and the other end of each of the opposing conductor patterns are connected to each other via a plurality of through holes.

Effect> According to the above configuration, one end and the other end of each of the conductor patterns facing each other with each magnetic sheet sandwiched therebetween are connected to each other via a plurality of through holes. Even if the conductor layer formed on the inner peripheral surface of some through holes is interrupted due to evaporation and diffusion during firing of the laminate, all of the through holes will not be interrupted and the connection will be reliable. Become.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of the multilayer chip coil according to the present invention, and the reference symbol ■ in this figure indicates the multilayer chip coil. Note that the main structure of the laminated chip coil 1 in FIG. 1 corresponds to the conventional example explained based on FIG. 3.

The laminated chip coil 1 in this embodiment includes a plurality of rectangular magnetic sheets 2. ...alternately I80
The magnetic sheet 2 is formed by integrally firing a laminated body formed while rotating the magnetic sheet 2, and a conductor pattern 3 having a U-shape in plan view is formed on the upper surface of each magnetic sheet 2. At one end of each conductor pattern 3, a plurality of (three in the figure) penetrating the magnetic sheet 2 along its thickness direction are provided.
Through holes 4. ... are formed, and a conductor layer is fixed to the inner peripheral surface of each through hole 4. Note that no conductor pattern is formed on the lower surface of each magnetic sheet 2, and at this time, the material of the magnetic sheet 2 is Ni-Zn ferrite, N
i-Cr-Zn ferrite, Mg-Zn ferrite, Cu-Zn ferrite, etc. are used, and it is best to use silver, silver-palladium, etc. as the conductor material for forming the conductor pattern 3 and the conductor layer. .

And, on each of the lower and upper sides of this laminate,
A magnetic sheet 6 having a conductor pattern 5 for external extraction formed on the upper surface is laminated.

A desired number of magnetic sheets having no conductor pattern formed on the upper and lower surfaces may be further laminated on the lower side and the upper side of the laminate in which the magnetic sheets 6 are laminated.

As a result of the above configuration, this multilayer chip coil 1
, one end and the other end of each of the conductor patterns 3 facing each other with the magnetic sheets 2 stacked on each other sandwiched therebetween have a plurality of through holes 4. . . , a coil-shaped conductor path along the vertical direction is formed continuously. Although not shown, a pair of external electrodes are formed at both ends of the laminated knob coil 1 to be respectively connected to the conductor pattern 5 for external extraction.

Next, FIG. 2 is an exploded perspective view showing another embodiment of the laminated chip coil according to the present invention, and reference numeral 10 in this figure indicates the laminated chip coil.

Note that the main structure of the laminated chip coil 10 in FIG. 2 corresponds to the conventional example explained based on FIG. 4.

The laminated chip coil 10 in this embodiment includes a plurality of magnetic sheets 11. ... are laminated and pressed together while being alternately rotated by 180 degrees, and are integrally fired.The upper and lower surfaces of each magnetic sheet 11 are provided with a conductor pattern that has a five-figure shape in plan view. 12a and 12b are formed. One end of the conductor pattern 12a and the conductor pattern 12 are opposite to each other with the magnetic sheet 11 in between.
The other end of b refers to a plurality of through holes 13. are connected to each other by...

Further, at this time, each of the conductor patterns 12a and 12b formed on each magnetic sheet 11 is different from the conductor pattern 1 of the other magnetic sheet 11 which is arranged adjacent to and facing each other.
2a and 12b, and are electrically connected to each other.

Then, on the lower side of this laminate, a magnetic sheet 15 having a conductive pattern 14 for external extraction formed on the upper surface is laminated, and on the upper side, a conductive backing 14 for external extraction is formed on the upper surface. Magnetic sheets 15 are laminated. A desired number of magnetic sheets having no conductor pattern formed on the upper and lower surfaces may be further laminated on the lower side and the upper side of the laminate in which the magnetic sheets 15 are laminated.

As a result of the above configuration, this multilayer chip coil 1
0, the conductor patterns 1112b formed on the upper and lower surfaces of each magnetic sheet 11 are connected to each other via the through hole 13, and the opposing conductor patterns 12a of the magnetic sheets 11 stacked on each other,
12b are connected in contact with each other to form a coiled conductor path. Although not shown, a pair of external electrodes are formed at both ends of the laminated chip coil IO to be respectively connected to the conductor pattern 14 for external extraction.

The above are examples of the present invention, and it goes without saying that design changes may be made within the scope of the invention. That is, for example, the shape of the conductor pattern, the number and formation position of the through holes, etc. are arbitrary, and are not limited to the contents of the above embodiments.

<Effects of the Invention> As explained above, according to the present invention, one end and the other end of each of the conductor patterns facing each other with a magnetic sheet in between are connected to each other via a plurality of through holes. Therefore, even if the conductor layer formed on the inner circumferential surface of some through holes is interrupted during firing of a laminate consisting of multiple magnetic sheets, all of the through holes will not be interrupted and the conductor will be disconnected. This has the effect that one end and the other end of the pattern can be reliably connected and a coiled conductor path can be secured.

[Brief explanation of drawings]

1 and 2 are related to the present invention, FIG. 1 is an exploded perspective view showing one embodiment of the multilayer chip coil, and FIG. 2 is an exploded perspective view showing another embodiment of the multilayer chip coil. be. Moreover, FIGS. 3 to 6 relate to the conventional example, and the third
The figure is an exploded perspective view of the main part showing an example of a laminated knob coil, FIG. 4 is an exploded perspective view of the main part showing another example, and FIG. 5 is a sectional view of the main part to explain the problems in the conventional example. be. Reference numbers 1 and 10 in the figure are laminated chip coils, 2.11
is a magnetic sheet, 3, 128, 12b is a conductor pattern,
4 and 13 are through holes.

Claims (1)

[Claims] (1) A plurality of magnetic sheets on which conductor patterns of a predetermined shape are formed are laminated, and one end and the other end of each of the conductor patterns facing each other with each magnetic sheet in between are connected to each other through a plurality of through-holes. A multilayer chip coil characterized by being connected through holes.