JPS5834905A - Laminated inductor - Google Patents

Abstract

PURPOSE:To obtain a laminated coil by a method wherein a part of the coil is printed on an electrically insulating magnetic substance sheet by conductive paste and then the half of right and left of the coil is alternately covered with magnetic sheet for printing a part of the coil and terminals are connected to a coil. CONSTITUTION:Terminals 1S, 2S and a part 2, 3 of a coil are printed on a square insulative sheet 1 printed on a suitable substrate surface. Next, the insulative sheet 4 is printed on the left half of the insulative sheet 1 and coil sections 5, 6 are printed to connect the coil sections 5, 6 to the coil sections 2, 3. Next, coil sections 8, 9 are printed by printing an insulative sheet 7 on the right half of the insulator sheet 1. Similar printing is successively repeated by the desired number of times to provide terminals 1F, 2F. The terminals 1F, 2F are formed in one united body by pressure baking and the terminals, 1F and 2S are connected. The terminals 1S and 2F are used as external terminals. This permits to manufacture a small-sized laminated coil.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laminated noodle inductor, and more particularly to a laminated inductor having overlapping windings.

It has been proposed by the Ministry of the Invention and others to manufacture a multilayer inductor by combining a printing process and a firing process. The multilayer inductor of the present invention basically utilizes the above structure, but conventional multilayer inductors have a higher inductance value with the same volume because of insufficient consideration regarding the structure and manufacturing process. It was still insufficient as a highly integrated inductor.

Accordingly, an object of the present invention is to provide a multilayer inductor of this type that has a sufficiently improved inductance value without substantially increasing the volume.

The present invention provides a magnetic raw sheet using a powder paste of an electrically insulating magnetic material (ferrite), and Ag.

Conductors using powder pastes such as Ag-Pd and Pd are printed alternately to form a laminate, and at this time, the conductors are formed with a coil of approximately one hand turn on the surface of the magnetic sheet, and each In a laminated inductor obtained by connecting the layers to form one coil as a whole and then firing the laminated body, the conductor printed on the surface of each magnetic sheet is about 2 turns long. These two wires are parallel to each other and connected to the corresponding two wires of the adjacent magnetic layer, and these two wires are combined at the last printed part to form a coil that is approximately twice as long. It is said that

According to the method of the present invention, the inductance value of the multilayer inductor is much larger than that of the conventional one, and can be approximately doubled, while the volume does not substantially increase, so the multilayer inductor can be miniaturized, Alternatively, a large inductance value can be provided with the same volume.

The invention will now be explained in detail with reference to examples.

The following explanation assumes that the magnetic layer and the coil conductor are all laminated by the printing method, but some of the magnetic layers are also made using the superposition method (a method in which pre-formed magnetic raw sheets are placed and stacked). It should be understood that this can also be done. Further, although the embodiment describes the manufacture of a single product, in reality, a large number of inductors are simultaneously printed and laminated.

M1~ showing the method of manufacturing the multilayer inductor of the present invention
Refer to Figure 12. These figures clearly show the structure of the multilayer inductor of the present invention.

As shown in Figure 1, first, a rectangular magnetic sheet 1 (the raw sheet mentioned above, the same applies hereinafter) is printed on a suitable substrate (not shown). Moving on to the process shown in Figure 2,
Conductive paste (the paste mentioned earlier...the same applies hereafter)
is printed on the magnetic layer 10 to form parallel conductors 2.3. These conductors have a length of approximately one hand turn to form a coil, and are U-shaped (or may be circular). Further, as shown in FIG. 2, one end of the conductor 2.5 is drawn out to the upper side and the left side (as viewed in the figure), respectively, to form lead-out portions 1S and 2S. Next, as shown in FIG. 3, a magnetic sheet 4 is printed on the left half of the laminate to cover some of the conductors. Next, U-shaped parallel conductors 5.6 are connected to the conductors 2.3 and extend onto the magnetic sheet 4, as shown in FIG.
print. As shown in Figure 5, a magnetic sheet 7 is printed on the right half of the laminate, and then a conductor 5 is printed as shown in Figure 6.
．． U-shaped parallel conductors 8 and 9 are printed, which are connected to the magnetic sheets 6 and 6 respectively and extend onto the magnetic sheet 7. Furthermore, the conductor 10 shown in FIG. 7 is printed on the left half of the laminate, and the process proceeds to the step shown in FIG. 8, where the conductor 11 connected to the conductor 8 and the lower side lead-out portion 2F connected thereto are printed. In the step of FIG. 9, a magnetic sheet 12 is further printed on the left half of the laminate, and a conductor 1 extending from the conductor 9 as shown in FIG.
3 and the drawer portion 1F exposed on the left side of the laminate.

The drawer part 1F is set in a positional relationship that is vertically aligned with the drawer part 2s shown in FIG. Finally, the magnetic layer 14 is printed on the entire surface as shown in FIG.

The obtained laminate is still in a raw state. This laminate is charged into a firing furnace and fired at a predetermined high temperature and time to obtain an integral fired body. There is a conductor lead-out part 1 on the side surface of the fired laminate.
8,28. IF and 2F are exposed. External terminal 14 that connects to external terminal 16.18 that connects 2S and 1F,
The external terminal 15 connected to 2F is attached by printing or applying the same conductive paste as the conductor or a conductive paste that can be baked at low temperature, and then baking it.

By connecting the drawer parts 2S and 1F, the drawer s1S
It can be seen that a clockwise conductor coil is formed from to 1F, and then a clockwise conductor coil is formed from drawer s2S to 2F. Thus, the feature of the present invention is that two parallel
A set of coils is connected in the middle to form one inductor with twice the number of filters. 1st
FIG. 5 shows a circuit diagram of the completed multilayer inductor shown in FIG. 12.

As described above, the present invention has an inductance value that is almost twice that of the conventional multilayer inductor, with only slight changes to the structure and manufacturing method of the conventional multilayer inductor, and with almost the same number of steps as the conventional multilayer inductor manufacturing method. It has the advantage of being able to provide an inductor.

Therefore, on the contrary, if the same inductance value is sufficient, it is possible to construct a spear-like inductor with a significantly reduced number of steps compared to the conventional method. It will be apparent to those skilled in the art that many variations are possible within the scope of the invention.

[Brief explanation of drawings]

1 to 11 are plan views showing each sequential process of the manufacturing method of the multilayer inductor of the present invention, FIG. 12 is a perspective view of the completed multilayer inductor of the present invention, and FIG.
FIG. 2 is a circuit configuration diagram of the N-type inductor shown in the figure. The upper part of the figure is as follows. 1.4.7.10.12.14: Electrically insulating magnetic sheet 2.5.8.11: First set of conductors 3.6.9.13: Second set of conductors IS, 2S, IF, 2F: Drawer part 14.15.16ζ External terminal:: +4 Name of agent: Motohiro Kurauchi,:,,,,H+・
,'iFigure 1 Figure 6 Figure 11

Claims (1)

[Claims] (1) A laminated inductor in which an electrically insulating magnetic sheet and a conductor are laminated in a roughly patterned manner, and the conductor is wound around from layer to layer of the magnetic sheet to form a coil, in which the conductor is arranged in two parallel layers. 1. A laminated inductor, characterized in that a set of coils is formed, and a terminal end of the coil of the one set is connected to a starting end of the other fill via an external terminal.