JPH0411707A - Coil part - Google Patents

Abstract

PURPOSE:To eliminate need of temporarily fixing with adhesive agent to enable automatic processing of binding by providing a plurality of protrusions on a flange of the bobbin along a mounting face of a coil part at positions where the protrusions do not protrude from an outer peripheral face of the flange and by binding and fixing the end of a coil wire wound around the bobbin to the protrusions. CONSTITUTION:A starting end of a coil wire 20 is bound to a first protrusion 6a, a gear not shown is engaged with gear parts 4a, 4b to transmit torque, a bobbin 1 is rotated with one of sides 10a of a core 10 as the center, the wire 20 is wound around two flanges 3a, 3b, and the end of the winding is bound to a second protrusion 6b. The bound part is soldered, and the end of the wire 20 and the protrusions 6a, 6b are firmly fixed with each other. Since the protrusions 6a, 6b are constituted, they do not protrude from an outer peripheral face of bobbin flanges 2a, 2b, the protrusions 6a, 6b will not interfere with the core 10 causing no obstruction in winding the coil. Further the coil can be attached to a printed board by solder reflow thereby eliminating need of a terminal block.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to coil components used in constructing electronic circuits such as coilers and oscillators.

BACKGROUND OF THE INVENTION Conventionally, various types of choke coils that are divided into bobbins have been provided as choke coils. This moves the bobbin 2 times parallel to the axis.
The bobbin is divided into sections, and one side of a roughly mouth-shaped core is held between each bobbin piece to form a roughly cylindrical bobbin, and a coil wire material is wound around the bobbin. The work of winding the coil wire is done by rotating the bobbin with it attached to the core.
If a terminal is provided on the bobbin in advance, the terminal will come into contact with the core during rotation, making it impossible to rotate the bobbin. Therefore, no terminal is provided on the bobbin, and the end of the coil wire material is temporarily fixed to the bobbin with adhesive. After the winding work is completed, the terminal block with the terminal is fixed to the bobbin, and the coil end is tied to the terminal and soldered.

However, with the above-configured coil components, the end treatment of the coil wire requires two steps: temporarily fixing it to the bobbin with adhesive, tying it to the terminal, and soldering it, and it is difficult to automate the tying process. There is a problem with this.

SUMMARY OF THE INVENTION An object of the present invention is to provide a surface-mounted coil component that eliminates the step of temporarily fixing the end of a coil wire material to a bobbin with an adhesive, and that makes it easy to automate the tying process. .

Means and Function for Solving the Problems In order to solve the above problems, the coil component according to the present invention differs from the conventional bobbin split type coil component in that a plurality of protrusions are formed on the flange of the bobbin from the outer peripheral surface of the flange. It is installed in a position where it does not protrude. This is to prevent the protrusions from interfering with the core when the bobbin is rotated in the process of winding the coil wire around the bobbin.

The coil wire is wound by rotating the bobbin with one end of the coil wire wrapped around the first of the projections. After winding is completed, the other end of the coil wire is tied to the second of the projections. In this way, there is no need to temporarily fix the end of the coil wire to the bobbin with adhesive. The protrusion from which the end of the coil wire is attached is
It is provided along the mounting surface of the coil component and functions as a surface mounting terminal.

The protrusions are preferably made of a conductive material in order to achieve electrical connection with the coil wire by soldering or the like, but they may also be made of an insulating material such as resin.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the coil component according to the present invention will be described with reference to the accompanying drawings, along with a manufacturing method thereof.

In FIGS. 1 to 3, a bobbin 1 consists of bobbin pieces 1a and lb, each of which is divided into left and right halves in a direction parallel to the axis, each of which is molded with resin. This bobbin piece 1a
, lb are formed with flange portions 2a, zb, gear portions 4a, 4b, and semicircular groove portions 5a, 5b.
2b and the gear parts 4a, 4b are separated by groove parts 3a, 3b for winding the coil. In addition, the flange 2a,
2b has a protrusion 6a along the mounting surface of the coil component.
, 6b are provided at positions that do not protrude from the outer peripheral surfaces of the flanges 2a, 2b. These protrusions 6a, 6b are made of resin or metal.

The core 10 is made of ferrite and is molded into a substantially square shape, and its negative side 10a is clamped by the bobbin pieces 1a and lb. That is, the bobbin pieces 1a and lb are the groove portions 5a.

5b sandwich one side 10a of the core IO and adhere to it, and separate it from the substantially cylindrical bobbin 1. Groove portions 5a, 5b, gear portion 4
a and 4b are perfect circles.

The first protrusion 6a (or protrusion 6b) has a coil wire 20
The bobbin 1 is rotated around one side 10a of the core 10 by twisting the winding start end and transmitting rotational force by meshing gears (not shown) with the gear parts 4a and 4b, and winding the coil wire 20 at two locations. Wind it around the grooves 3a and 3b. When the coil is completely formed, the end of the winding is connected to the second protrusion 6.
b (or projection 6a). Coil wire material 20
The end of the wire is soldered to the coil wire 20.
The insulating film at the exposed portion is melted and removed, leaving the end of the coil wire 20 and the protrusion 6a.

6b are firmly fixed.

In the coil component described above, since the protrusions 6a and 6b do not protrude from the outer circumferential surfaces of the bobbin collars 2a and 2b, the protrusions 6a and 6b do not stick to the core 1 even when the bobbin 1 is rotated.
0, and there is no problem in winding the coil wire 20. In addition, since the coil terminal tying operation is performed on the protrusions 6a and 6b, automatic processing by a machine is easy. Moreover, the protrusion 6a.

Since 6b is directly attached to a printed wiring board or the like by means such as solder reflow, a terminal block is not required, and a simple surface-mount type coil component can be constructed.

Note that the coil component according to the present invention is not limited to the above embodiments, and can be modified in various ways within the scope of the gist.

As shown in FIG. 4, by attaching L-shaped node terminals 15a and 15b to the protrusions 6a and 6b, an in-line type coil component can be obtained.

Effects of the Invention As is clear from the above explanation, according to the present invention, a plurality of protrusions are provided on the flange of the bobbin at positions that do not protrude from the outer peripheral surface of the flange along the mounting surface of the coil component. Since the end of the coil wire wound around the bobbin is tangled, one end of the coil wire is tangled around the protrusion to perform the winding process, and then the other end of the coil wire is tied to another end. It can be attached to the protrusion, there is no interference between the protrusion and the core during the winding process, and there is no problem with the rotation of the bobbin, as well as the need to temporarily fix the wire end to the bobbin with adhesive as in the past. There is no need for automatic processing of karage work. Furthermore, a terminal block for attaching the terminals is no longer required, and the protrusions hanging from the ends of the coil wire also function as surface-mount terminals, making it possible to obtain a small surface-mount type coil component.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a coil component according to the present invention, and FIGS. 2 and 3 are a front view and a left side view of FIG. 1, respectively. FIG. 4 is a left side view showing a modification. 1...Bobbin, la, lb...bobbin piece, 2a
, 2b...flange, 6a, 6b...protrusion, 10...
- Core, 10a...-side, 20... Coil wire material. Patent applicant Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. In a coil component in which one side of a substantially square-shaped core is clamped by a plurality of bobbin pieces divided in a direction parallel to the axis to form a substantially cylindrical bobbin, a plurality of protrusions are attached to the flange of the bobbin. 1. A coil component, characterized in that the protrusion is provided along the mounting surface of the component at a position that does not protrude from the outer peripheral surface of the flange, and the terminal of a coil wire wound around a bobbin is hung from the protrusion.