JPH0121610B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a laminated inductor.

Paste of powdered magnetic material such as ferrite and Ag,
The present inventors have proposed that a laminated inductor be manufactured by a printing technique such as screen printing using a paste of metal powder such as Ag-Pd or Pd. Such an inductor is made by laminating thin layers of non-magnetic or magnetic electrical insulators and conductive coil pieces for forming a coil alternately by a printing method so that the conductive coil pieces are connected one after another in the insulator to form a coil. It is composed of: When a magnetic insulator is used, it is advantageous because the inductor has a closed magnetic circuit structure with a large inductance, whereas when a non-magnetic insulator is used, it has an open magnetic path with a small inductance but good linearity. However, neither of these inductors is suitable for use as a detector or sensor. The former has a closed magnetic circuit and hardly picks up an external magnetic field, and the latter has a low μ and is therefore inefficient.

An object of the present invention is to provide a laminated inductor that can satisfactorily sense an external magnetic field using a lamination method. The present invention achieves the above object with a laminated inductor comprising an outer circumferential portion of a non-magnetic insulator, an interior of a magnetic material, and a coil conductor buried in the boundary between these. Both the magnetic material and the insulator are laminated bodies, and the coil conductor is also a kind of laminated body whose ends are overlapped and extended. Depending on the purpose, the magnetic material may also be made of electrically insulating ferrite, etc., and part of the coil conductor may be overlapped with a magnetic material layer interposed, but it is also possible to make a part of the coil conductor into a closed magnetic circuit to achieve linearity. , DC superposition characteristics, and efficiency change.

A method of manufacturing a laminated inductor according to the present invention will be explained with reference to the drawings. 1 to 9 show examples of manufacturing a laminated inductor according to the first embodiment. The following explanation refers to manufacturing by printing method, and alumina,
An insulating layer is formed from a paste of an insulating powder such as steatite using a printing method such as the squeegee method, and a magnetic layer is formed by printing from a paste of an insulating powder such as ferrite powder. A conductor for a coil is formed by printing from a paste of metal powder such as powder. Note that the present invention is not limited to the printing method, but can also be implemented by sputtering.

As shown in FIG. 1, an insulator layer 1 is first formed. A conductor 2 having a lead-out end S is printed thereon. As shown in FIG. 2, a magnetic layer 3 is printed in the center of the insulating layer 1. At this time, the magnetic layer 3 and the conductor 2
It is positioned so that it overlaps with. In this example, it is assumed that the coil-forming conductor and the magnetic material always have this relationship. Moving on to the process shown in FIG. 3, a U-shaped insulating layer 4 is printed that covers the lower half of the conductor 2 and the lower half of the insulating layer 1 (excluding the magnetic layer), and then the U-shaped insulating layer 4 is printed as shown in FIG. The conductor 5 is extended from one end of the conductor 2 to the right side of the stack. Next, print an inverted U-shaped insulator layer 6 on the upper half as shown in Figure 5, and then print a conductor 7 extending from the end of the conductor 5 to extend it to the left side of the laminate as shown in Figure 6. . As shown in FIG. 7, a magnetic layer 8 is further printed in the central portion. Thereafter, the steps shown in Figures 3 to 7 are repeated as necessary, and finally the bottom of the lead-out conductor is printed as shown in Figure 7, and the insulator layer 9 is printed as shown in Figure 8 to complete the lamination. end. By firing this laminate at a predetermined high temperature and time, it becomes a sintered body, and further, as shown in FIG.
The open magnetic path type multilayer inductor of the present invention is obtained by baking 1 into a film.

In the multilayer inductor of the present invention, since the conductor portion is in the insulator, there is no magnetic material around each conductor to form a closed magnetic path, so the DC superposition characteristic is linear.
On the other hand, since the magnetic material is present in the central portion, there is an advantage that a certain degree of high magnetic permeability can be obtained for detecting an external magnetic field.

Furthermore, by overlapping the conductor portion and the magnetic material portion, the characteristics can be varied to some extent depending on the degree of overlapping. The laminated inductor of the present invention can be manufactured by repeating a few basic printed patterns, thereby simplifying the process. In the actual process, mass production is possible by simultaneously printing and laminating multiple laminated inductors in parallel.

Although the laminated inductor obtained by the printing method has high mechanical strength and is excellent, the present invention can also be easily realized by other methods such as sputtering.

[Brief explanation of drawings]

1 to 8 are plan views showing sequential steps in the method for manufacturing a laminated inductor of the present invention, and FIG. 9 is a sectional view of the laminated inductor of the present invention. The main parts in the figure are as follows. 1, 9: Insulator, 2, 5, 7: Coil conductor,
3, 8: Magnetic material, 4, 6: Insulator, 10, 11:
External terminal, S, F: Output conductor.

Claims (1)

[Scope of Claims] 1 A large number of conductor pieces are formed in the shape of a rotating winding in which their ends are overlapped and connected, and an insulating layer is interposed between upper and lower adjacent pieces of the conductor pieces. In the insulated laminated inductor, the inner part of the winding is composed of a laminate of electrically insulating magnetic layers, and the outer part is composed of a laminate of non-magnetic layers, and the conductor piece is composed of a laminate of electrically insulating magnetic layers and a laminate of non-magnetic layers. A laminated inductor made of a sintered body formed to span a non-magnetic layer. 2. The multilayer inductor according to item 1 above, wherein the conductor piece is completely buried in the insulator layer. 3. The laminated inductor according to item 1 above, wherein the magnetic layer is insulating and the conductor piece is partially insulated by the magnetic layer.