JPS63173309A - Manufacture of inductance element - Google Patents

Abstract

PURPOSE:To form a thin type inductance element by preparing a cylindrical air-core coil, pressing the air-core coil in the winding-axis direction and molding the air-core coil to a Flat coil. CONSTITUTION:In the structure of an air-core coil 3, a winding given slackness is executed, a winding, which has D' 2mm, d' 1.3mm and the volume V' of approximately 4.0mm<3> of a coil section 3 and inductance of 880nH and the number of turns of which is thirty times, is pressed from both surfaces in the winding-axis direction, and axis rings are displaced so as to be broken to sections where there are clearances, thus preparing the coil. Consequently, L size is shortened, and the coil is molded to a thin type flat coil. The coil is miniaturized in inside dimensions (d) of 0.5-0.7mm, outside dimensions D of 2.2-2.4mm, thickness dimensions L of 0.35mm and the vol ume V of approximately 1.3-1.6mm of a coil section 8, and inductance is increased as approximately 1020nH, and the inductance of this coil can be made higher than that of a cylindrical coil.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing an inductance element used in electronic circuits such as communication equipment.

BACKGROUND OF THE INVENTION Inductance elements are widely used in electronic circuits of communication equipment, such as in combination with capacitor elements to form filter devices.

An air-core coil has been a commonly used inductance element in the past, and has a solenoid-like structure as shown in FIGS. 5 and 6.

FIG. 5 is a front view, and FIG. 6 is a side view. 1゜2 are the lead wires of the coils, 3 is the coil part with the winding, L
' is the length of the coil 3, D' is the outer diameter of the coil 3, and d' is the inner diameter of the coil 3. For example, L”=1.3mm, D
2 mm, d'' = 1.3 mm, the volume of the coil part 3 is about 4 mm, the number of turns of the coil is about 30, and the inductance is about 800 to 900 nH.It is constructed using such an air-core coil. There is a filter device having the structure shown in Fig. 7, and Fig. 7 is a side sectional view of the filter device. 3 is attached. 5 and 6 are signal input/output terminals, 7 is paint that protects the outer surface, and T' is the thickness of the filter device. For example, T' is about 4 mm. Also, this filter device The equivalent circuit of is shown in FIG.

Problems to be Solved by the Invention Recently, with the miniaturization of equipment, thin inductance elements and filter devices are required.

However, air-core coils constructed using conventional winding technology
As shown in FIG. 6, it has a cylindrical shape, so it was difficult to form a thin filter using this.

On the other hand, there are coils that are thinly formed using a laminated structure that is formed by forming a coil on a sheet using printing technology and laminating the sheets, but this has the disadvantage that conventional winding devices cannot be used. was there.

Therefore, the present invention aims to solve the above-mentioned drawbacks and provide a thin inductance element by utilizing a conventional winding device.

Means for Solving the Problems In order to solve the above problems, the present invention creates a cylindrical air-core coil, and presses the air-core coil in the winding axis direction to form a flat coil.

Function Since the present invention comprises the above-described means, an inductance element can be obtained by forming a cylindrical coil using a commonly used coil manufacturing apparatus and then compressing the coil in the axial direction.

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

FIG. 1 is an embodiment of the present invention, and is a front view showing the structure of a flat coil. To explain the process of creating the flat coil 8 shown in FIG. 1, in the structure of the air-core coil 3 shown in FIG.
Coil part 3 with nwn, d”=1, 3 mm
The volume V' is about 4.0 mm and the number of turns is 30 times.

When an inductance of 880 nH is pressurized from both sides in the direction of the winding shaft, the shaft ring collapses into a gap. In this way, a coil as shown at 8 in FIG. 1 can be created. FIG. 2 is a side view of FIG. 1.

Therefore, as shown in FIG. 2, the L dimension is short (thin) and a flat coil is formed. For example, the inner dimension d is 0.
5 to 0.7 mm, outer dimensions 2.2 to 2.4 mm
The thickness dimension is 0.35 mm, the volume (2) of the coil portion 8 is small, about 1.3 to 1.6 mm, and the inductance is about 1020 nH, which is higher than the conventional one.

9.10 is a lead wire of the flat coil 8.

FIG. 3 shows the flat coil 8 in order to protect the flat coil 8.
FIG. 2 is a cross-sectional view illustrating a structure coated with resin 11 mixed with resin or powdered ferrite. If a resin mixed with powdered ferrite is used, the inductance can be further increased to 1400n.
It can be improved by about H to 2000 nH.

FIG. 4 shows another embodiment, and the difference from FIG. 1 is that a flat coil 8 is mounted on an insulating substrate 12 with electrodes 13, 14 formed at both ends, and lead wires 9, 10 are connected to the electrodes 13, 14, respectively. 14 and the outside is solidified with a resin mixed with powdered ferrite so that electrodes 13 and 14 are exposed. With this configuration, a thin chip inductance element can be easily constructed. However, the insulating substrate may be made of a dielectric material or a magnetic material.

In addition, as other embodiments, FIG. 1, FIG. 3, or FIG.
If the inductance element shown in the figure is mounted on a ceramic substrate, since the thickness L of the flat coil is 0.35 mm, it is possible to easily produce a thin filter device with a thickness of 2M.

As explained above, according to the present invention, in order to obtain a flat thin coil by creating an air-core coil and applying pressure in the axial direction of the air-core coil, it is not necessary to directly create a flat coil. , can be easily made using conventional manufacturing equipment.

Moreover, the inductance can be improved compared to a cylindrical coil.

As described above, according to the present invention, by making the coil flat, the shape of the coil can be made smaller, which has great effects such as making it possible to realize a filter device with a thin shape using this coil. be.

[Brief explanation of the drawing]

FIG. 1 is a front view of a coil manufactured by the manufacturing method of the present invention;
Fig. 2 is a side view of the same, Fig. 3 is a sectional view of an inductance element in which the outside of the coil is coated with resin, and Fig. 4 is a sectional view showing an example of another inductance element manufactured by the manufacturing method of the present invention. , FIG. 5 is a front view of an air-core coil manufactured by a conventional manufacturing method, FIG. 6 is a side view of the same, and FIG. 7 is a sectional view of a filter device using a coil manufactured by a conventional manufacturing method. . FIG. 8 is an equivalent circuit diagram of the same filter device. 8...Coil 9.10...Lead wire 11...Resin 12...Insulator substrate 13.14...Name of electrode agent Patent attorney Toshio Nakao and one other person 〇－ Ward Ward C Guichimasa Mutter

Claims (1)

[Claims] A method of manufacturing an inductance element, comprising: winding a conductive wire to form a cylindrical coil, and compressing the cylindrical coil in the axial direction.