JPS6314410A - Chip coil - Google Patents

Abstract

PURPOSE:To use a base metal, which is cheaper than silver, as the material of an electrode, to simplify the process of manufacture, and to alleviate the restriction on the material of core by a method wherein a pair of protrusions are provided on the edge part of the outer surface of one of flanges, and the electrode is formed by adhering the base metal to the protrusions. CONSTITUTION:A pair of protrusions 18 and 20 and a core main body 16 are integrally provided on the edge of the outer surface of one of flanges 6 of the core main body 16 on which a pair of flanges 6 and 8 are formed on both ends of a winding core part 4. Then, a winding 14 is provided between said pair of protrusions 18 and 20 and the winding core part 4, and electrodes 22 and 24 are formed by adhering a base metal to the winding on the protrusions 18 and 20. For example, the winding work of the winding 14 on the protrusion 18 of the core main body16 is started, said winding 14 is wound around the winding core part 4, and the winding 14 is wound on the other protrusion 20. Then, when the flange 6 is dipped into a high temperature solder vessel as deep as to the position of the one dot chain line as shown in the diagram from the surface where the protrusions 18 and 20 are located, the covering of the winding 14 wound on the protrusions 18 and 20 is fused by the heat of the high temperature solder vessel, the winding 14 is solder-plated, and the electrodes 22 and 24 are formed on the protrusions 18 and 20.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a chip coil used as a circuit component.

(Prior Art) A conventional chip coil is shown in FIG. 4 along with its manufacturing method.

2 is a core, which is made of ferrite. The core 2 consists of a winding core 4 and flanges 6.8 formed at both axial ends thereof. The flange 6°8 has a cross-sectional area in a direction perpendicular to the axial direction of the winding core 4.

It is formed larger than the cross-sectional area of the core portion 4 in the same direction.

Silver paste is applied to the outer surface of one flange 6 by printing, and the silver electrode 10.1 is applied by baking.
2 is formed.

Next, wrap it around the winding core part 4 of this core 2! @14, both ends of the winding 14 are bent at the flange 6 of the core and passed over the silver electrodes 10.12. Next, on the surface of the flange 6 on which the silver electrode 10.12 was formed, the winding 14 from which the coating was removed is placed.
By soldering the first winding 14 and the silver electrode to,
12 are electrically connected.

(Problems to be Solved by the Invention) In the chip coil shown in FIG.
is formed in a planar shape on the surface of the flange 6 of the core, but such a planar electrode can only be formed by baking a noble metal such as silver paste. Therefore, a silver paste printing process is required, which increases processing costs.
There is also the problem that the cost of electrode materials increases.

Since baking of silver paste and the like requires high temperatures, there is also a restriction in material selection that the ferrite material constituting the core 2 must also be a material that can withstand high temperatures.

The present invention allows base metals that are cheaper than silver to be used as electrode materials, simplifies the manufacturing process, and
The object of the present invention is to provide a chip coil that is easy to manufacture and low in cost by easing restrictions on the material of the core.

(Means for Solving the Problems) In the chip coil of the present invention, a pair of protrusions are provided at the edge of the outer surface of one flange of the core body, which has a pair of flanges formed at both ends of the winding core. It is provided integrally with the main body, and a winding is provided between the pair of protrusions and the winding core, and a base metal is fixed to the winding of the protrusion to form an electrode.

(Example) FIG. 1 represents one embodiment of the invention.

16 is a core body made of ferrite, and as shown in FIGS. 2(A) and 2(B), the core body 16 has a winding core 4 and its It consists of flanges 6°8 formed at both ends in the axial direction. Flange 6
．． 8 is formed so that the cross-sectional area of the winding core 4 in the direction orthogonal to the axial direction is larger than the cross-sectional area of the winding core 4 in the same direction.

A pair of protrusions 18 , 20 are provided integrally with the core body 16 at the edge of the outer surface of one flange 6 of the core body 16 .

The winding 14 is wound around the winding core 4, and both ends of the winding 614 are wound around the protrusions 18.20, respectively.

A base metal such as solder is fixed to the winding 14 wrapped around the protrusion 18.20, and the base metal and the winding 14 are bonded to each other.
is electrically conductive at the protrusion 18.20, forming an electrode 22.24.

Next, a method of manufacturing this example will be explained.

In the core body 16 shown in FIGS. 2(A) and 2(B), the winding 14 begins to be wound around one of the protrusions 18 (or 20), and the winding 14 is wound around the winding core 4. Next, the winding core 14 is wound around the other protrusion 20 (or 18). FIG. 3 shows the state in which the winding 14 is wound.

Next, to form the electrodes, as shown in FIG.
One flange 6 of the core body 16 is immersed in a hot solder bath from the surface with the protrusion 18.20 to the position indicated by the dashed line 26. At this time, the coating of the windings 14 wound around the protrusions 18.20 is melted by the heat of the high-temperature solder bath, and the windings 14 are plated with solder, and each protrusion 18.2 is coated with solder.
The electrodes 22 and 24 are formed at the 0 portion.6 The embodiment shown in FIG. 1 was formed in this manner.

(Effects of the Invention) In the present invention, a wire is wound between a pair of protrusions on the outer surface edge of one flange of the core body and the winding core, and a base metal such as solder is applied to the winding on the protrusion. Since the electrodes are formed by fixing the silver paste, the electrode formation process is simpler than the conventional method of printing and baking silver paste.

Furthermore, since expensive electrode materials such as silver are not used, it can be manufactured at low cost.

Furthermore, since high-temperature processes such as silver paste baking are not required, restrictions on the materials required for the core are relaxed.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the present invention, and Fig. 2 is a diagram showing a core used in the same embodiment, where (A) is a front view and Fig. 2 (B) is a bottom view. be. FIG. 3 is a front view showing the process of winding the core of FIG. 2 to form electrodes, and FIG. 4 is a front view showing a conventional chip coil. 4... Core portion, 6.8... Flange, 14... Winding wire. 16...Core body, 18.20...Protrusion, 22.24...Electrode.

Claims (1)

[Claims] (1) A pair of protrusions are provided integrally with the core body on the edge of the outer surface of one flange of the core body, which has a pair of flanges formed at both ends of the winding core, and the pair of protrusions A chip coil in which a winding is provided between the protrusion and the winding core, and a base metal is fixed to the winding of the protrusion to form an electrode.