JPH0432777Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a composite inductor board that has a plurality of inductors in a magnetic substrate, and is a composite inductor board suitable for applications such as LC filters and delay lines. It is related to the board.

[Prior art and its problems]

With the demand for smaller and more complex electronic components, the use of multilayer chip components is progressing, and the development of multilayer inductors is also progressing following multilayer capacitors. LC filters, which have an inductor attached to a dielectric substrate with a capacitor formed thereon, are also used. Furthermore, composite parts in which an inductor and a capacitor are integrally formed are also being considered.

As described above, the laminated inductor is attached to a dielectric substrate on which a plurality of capacitors are formed as individual components, but depending on the application, there may be a limit to miniaturization. This is possible because the dimensions of the multilayer inductor are larger than the dimensions of the multilayer capacitor.

Therefore, the inventor proposed a composite inductor board using a magnetic substrate on which a plurality of laminated inductors are formed. In such cases, an inductor board is used.
In LC composite parts, delay lines, etc., it is desirable to be able to arbitrarily set the coupling state between inductors.

[Purpose of invention]

An object of the present invention is to provide a composite inductor substrate that satisfies the above requirements and can provide coupling between adjacent inductors.

Another object of the present invention is to provide a structure in which the bonded state can be arbitrarily set.

Furthermore, it is an object of the present invention to obtain a composite inductor substrate that allows easy construction of LC composite components and delay lines with various functions.

[Summary of the idea]

The present invention involves arranging laminated inductors made up of conductor layers laminated and connected in a figure-8 shape inside a magnetic substrate in the horizontal direction, and arranging them on the surface of the magnetic substrate containing the inductors. The above objective is achieved by forming the grooves. In other words, a plurality of inductance elements are arranged in the lateral direction of the figure 8 shape, in which a figure 8 conductor pattern is connected by going around two different points and intersecting between the two points, and magnetic layers are alternately laminated with the inductance elements. The composite inductor board is characterized in that the magnetic layer on the surface of the intersection of the conductor patterns is provided with a groove extending laterally in the shape of a figure eight.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a perspective view of an embodiment of the invention. The magnetic substrate 10 is made by laminating ferrite, and a conductive layer 11 is formed between the layers to constitute an inductor. The conductor layer 11 is laminated alternately with the magnetic layer while being connected, and has a structure in which the conductor layer 11 alternately goes around two points and intersects at a position midway between the two points. Therefore, the direction of winding is opposite between the part that goes around one point and the part that goes around another point, and the direction of the current is also opposite. The magnetic field generated thereby also has the opposite direction.

If the conductor layers and magnetic layers are alternately laminated as described above, and a relatively thick magnetic layer is formed on the top and bottom surfaces, the magnetic layer will overlap the area surrounded by the conductor layer and the top and bottom surfaces. A magnetic circuit in which the magnetic field is aligned in one direction is thus formed. Therefore, since it becomes a closed magnetic circuit type inductor, the inductance can be increased even if the number of laminated turns is small.

A plurality of inductors thus formed are arranged at intervals in the lateral direction of the figure eight. Then, a figure-eight-shaped groove 12 is formed in the horizontal direction on the surface of the magnetic substrate 10.

Without the grooves 12, a closed magnetic path would be formed within each figure-eight inductor, and coupling with adjacent inductors would be reduced. However, since the magnetic circuit is interrupted by the groove 12, the coupling between adjacent inductors increases. In particular, when the winding direction and the current direction are reversed, the direction of the magnetic field is reversed, and a magnetic loop is formed between adjacent inductors, maximizing the coupling. Therefore, the coupling between adjacent inductors can be set arbitrarily by the pattern of the conductor layer and the wiring.

FIG. 2 is a front sectional view of a composite inductor substrate according to the present invention. It is shown that a magnetic loop is formed and coupled between the inside of the conductor layer 11 constituting each inductor and the inside of the adjacent conductor layer 11.

Note that the magnitude of the bond can be changed by adjusting the width and depth of the groove 12, and can also be adjusted by increasing the number of grooves.

In manufacturing the composite inductor substrate according to the present invention, the magnetic substrate 10 can be formed by laminating green sheets or by printing. Further, the conductive layer 11 can be similarly formed by connecting with through holes or by printing alternately with magnetic material. The ends of the conductor layer may be drawn out to the side surface of the substrate, or may be drawn out to the upper and lower surfaces. Furthermore, if a wiring pattern is formed on the surface of the board, an LC filter or delay line can be obtained simply by attaching a chip capacitor by soldering or the like.

[Effect of idea]

According to the present invention, it is not only easy to couple adjacent inductors, but also the coupling state can be set arbitrarily.

This allows for easy assembly of LC composite parts, delay lines, etc. for various uses.

Furthermore, there is an advantage that the inductance value of each inductor can be made sufficiently large.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a front sectional view. 10...Magnetic substrate, 11...Conductor layer, 12
……groove.

Claims (1)

[Scope of utility model registration request] There are 8 inductance elements in which 8-shaped conductor patterns are alternately laminated with magnetic layers and are connected while going around two different points and intersecting in the middle of the two points.
1. A composite inductor board comprising a plurality of inductors arranged in a lateral direction in a figure 8 shape, the magnetic layer on the surface of the intersection of the conductor patterns having grooves extending in the lateral direction in a figure 8 shape.