JPS6315732B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves coating an insulating paint on an insulating substrate, leaving a portion of the magnetic paint that has been applied and drying, and then drying the insulating paint, and then laminating a large number of printed inductors that have been independently coated with conductive paint and dried in long strips on top of the insulating paint. Manufacture an inductance element in which a conductor made of conductive paint between the laminated layers is coated with conductive paint and connected to form an electric circuit, and a magnetic body made of magnetic paint is coated and connected to form a magnetic closed circuit. The method is to obtain a thin and small inductance element.

Conventionally, small inductors, so-called microinductors, have mainly been used with windings around a small drum-shaped core, but since the magnetic circuit of these inductors is an open magnetic path, their effective magnetic permeability is low. In order to obtain the inductance value, a large number of windings must be wound, and there is also a large amount of magnetic leakage, which may have a magnetic effect on electronic components installed near equipment that uses this inductor. There were also drawbacks, such as the limitations of its small size.

The present invention relates to a method of manufacturing a thin and small inductor element by eliminating such drawbacks of conventional microinductors and sequentially applying and drying paints made of a magnetic material, an insulating material, and a conductive material. In other words, a large number of conductors obtained using conductive paint surrounded by insulators obtained using insulating paint are connected, and a magnetic material is applied to both sides of the electrical circuit corresponding to the winding and the insulator. The present invention relates to a method of manufacturing an inductor configured with a closed magnetic circuit corresponding to a core made of

In the method of manufacturing an inductance element of the present invention, first, as shown in FIG. 1, a magnetic coating material 2 is applied onto an insulating substrate 1 to a thickness of 20 to 30 microns and dried. Next, as shown in Figure 2, make the applied magnetic material slightly longer in the width direction.
The insulating paint 3 is applied so that the length is slightly shortened and the magnetic material is exposed, and then dried. Further, as shown in FIG. 3, thin strips of conductive paint 4 are applied on top of the insulating paint 3 so as to be independent of each other. The number of applied strips of conductive material corresponds to the number of turns in a conventional inductor. After this coating is dried, as shown in FIG. 4, an insulating paint 3-1 is applied and dried over the insulating paint, leaving only a small portion of both ends of the conductor coated with the conductive paint 4. Continuing, as shown in FIG.
Apply 1 and dry. Furthermore, as shown in FIG. 6, an insulating paint 3-2 is applied and dried on the magnetic paint 2-1, leaving only a small portion of the conductive paint 4 at both ends. Subsequently, as shown in FIG. 7, conductive paint 4-1 is applied in a thin strip on top of insulating paint 3-2 so as to be lined up with conductive paint 4 near the middle of two adjacent pairs, and dried. Finally, the conductor made of conductive paint 4 and the conductor made of conductive paint 4-1 are connected by alternately coating their tips with conductive paint 4-2, and each conductor located at both ends is connected to a lead terminal. 10 are connected and dried to form an inductor. The inductor made in this way is in contact with the magnetic paints 2 and 2-1 to form a magnetic closed circuit, as shown in FIG. 9 of the XX cross section in FIG. One conducting wire is formed by the paints 4, 4-1 and 4-2. Furthermore, it is clear from FIGS. 10 and 11, which show cross sections at the positions Y ₁ -Y ₁ and Y ₂ -Y ₂ in FIGS. 9 and 8, that it has a laminated structure.

As described above, the inductor manufacturing method of the present invention does not require winding work unlike conventional wire-wound inductors, and by applying magnetically conductive and insulating paint, thin and small laminates can be manufactured. You can make an inductor with this structure.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the state after applying the magnetic material in the inductor element manufacturing method of the present invention, FIG. 2 is a plan view showing the state after applying the insulating material on the state shown in FIG. 1, and FIG. FIG. 4 is a plan view showing a state after applying a conductive material over the state shown in FIG. 2; FIG. 4 is a plan view showing a state after applying an insulating material over the state shown in FIG.
The figure is a plan view showing the state after applying the magnetic material on the state shown in FIG. 4, FIG. 6 is a plan view showing the state after applying the insulating material on the state shown in FIG. 5, and FIG. FIG. 8 is a plan view showing a state in which an elongated conductive paint is applied on top of the state shown in the figure; FIG. 1 to 11 show cross-sectional views of the laminated structure thus obtained. In the figure, 1: insulating substrate, 2, 2-1: magnetic paint, 3, 3-1, 3-2: insulating paint, 4, 4-
1, 4-2: Conductive paint, 10: Terminal lead.

Claims (1)

[Claims] 1. After applying and drying a magnetic material on an insulating substrate, applying an insulating paint to a part of the magnetic paint and drying it, and further applying a conductive paint to a part of the insulating paint and drying it to form a printed inductor, A large number of these are laminated, and the conductive paints between the laminated layers are connected with conductive paint to form an electric circuit, and the magnetic paints are connected with magnetic paint to form a magnetic closed circuit. A method of manufacturing an inductance element, characterized in that: