JPS62134913A - Choke coil and manufacture thereof - Google Patents

Abstract

PURPOSE:To manufacture coaxial lead type and leadless type choke coils with the same facility by providing lead wires on conductive plate-shaped members, connecting the end portions of a winding to the lead wires, and coating and forming the whole thereof with a resin with the outer surfaces of the conductive plate-shaped members being exposed. CONSTITUTION:Flange portions 22 are formed on both end portions of a core 21 formed in the shape of a bobbin, inner lead wires 24 and outer lead wires 25 are formed on both sides of conductive plate-shaped members in the form of a disk, and the inner lead wires 24 are fixed to the flange portions of the core 21 with a conductive resin 26. The end portions 29 of a winding 28 wound around the outer periphery of a body portion 27 of the core 21 are wound around and soldered to the inner lead wires 24. Thereafter, the whole thereof is coated with a resin 30 with the outer surfaces 23a of the conductive plate- shaped members 23 and the outer lead wires 25 being exposed, thereby completing a coaxial lead type choke coil. Also, a leadless type choke coil is easily obtained by cutting off the outer lead wires 25.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a choke coil used in various electronic devices and a method for manufacturing the choke coil.

Conventional technology Traditionally, choke coils using pincushion cores include axial lead types and leadless types using metal strip electrodes, etc., depending on the shape of the terminal.
These are widely used by being attached to printed circuit boards of various electronic devices.

By the way, in the axial lead type choke coil, as shown in Fig. 4, a lead wire 3 is fixed with resin 4 to the flanges 2 provided at both ends of a pincushion-shaped core 1, and then wound around the body 5 of the core. The wire 6 is wound, the end 7 of the winding wire 6 is wound around the lead wire 3 and soldered, and the whole is solidified into one body with resin 8. Further, the resin 8 is applied using a roller or the like.

The axial lead type choke coil manufactured as described above can be manufactured by a construction method centered on the central axis 9 of the core 1, so that integrated production is easy and can be manufactured at low cost.

In addition, a leadless type choke coil as shown in FIG. 5 has a pincushion core 10 mounted with a separate metal electrode 11, and a wire wound around the body 12 of the pincushion core 10. 13, the end portion 14 of this winding wire is connected to the electrode 11 by welding, and then integrally molded with resin 15.

Problems to be Solved by the Invention As mentioned above, axial lead type choke coils can be manufactured in an integrated manner, but leadless type choke coils are difficult to be manufactured in an integrated manner due to their shape. Therefore, it has not been possible to consistently produce both types of choke coils using the same manufacturing equipment.

Means for Solving the Problems In order to solve the above problems, the choke coil of the present invention was constructed as follows.

That is, a lead wire is provided on a conductive plate-like member, the lead wire is connected to the flanges formed on both sides of a thread-wound core, a wire is wound around the body of the core, and the end portion of the winding wire is wound. is connected to the lead wire, and the entire conductive plate member is coated and molded with resin with the outer surface exposed.

Function By using the above-described structure in which lead wires are formed on both sides of a conductive plate-like member, an axial lead type choke coil can be completed. A leadless choke coil can be completed by removing the lead wires outside the coil. It is also possible to obtain a leadless type choke coil by using a conductive plate-like member with lead wires provided only on one side, and the manufacturing process for axial lead type choke coils and leadless type choke coils is greatly improved. Parts can be shared, making integrated production possible.

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

FIG. 1 is a cross-sectional view of a choke coil according to an embodiment of the present invention. In the figure, 21 is a core formed in a thread-wound shape, and flanges 22 are formed at both ends of the core. Reference numeral 23 denotes a disc-shaped conductive plate member, on both sides of which an inner lead wire 24 and an outer lead wire 25 are formed, and the inner lead wire 24 is fixed to the flange of the core 21 with a conductive resin 26. has been done. An end 29 of a winding 28 wound around the outer periphery of the body 27 of the core 21 is wound around the inner lead wire 24 and soldered. Thereafter, the entire conductive plate member 23 is covered with a resin 30 with the outer surface 23a and the outer lead wire 25 exposed.

In the above manner, an axial lead type choke coil is completed.

Further, a leadless type choke coil can be easily obtained by cutting off the outer lead wire 25 from the above-mentioned axial lead type choke coil.

Therefore, according to this embodiment, an axial lead type choke coil and a leadless type choke coil can be manufactured in the same manufacturing process.

In addition, since both can be manufactured using a construction method centered on the central axis 31 of the core 21, integrated production is easy and can be manufactured at low cost.

Furthermore, when manufacturing a leadless type choke coil using a conductive plate member 33 having only an inner lead wire 32 as shown in FIG. 3, the above-mentioned axial lead type choke coil and its manufacturing process are This is extremely useful as parts can be shared.

Effects of the Invention As clarified in the above explanation, according to the present invention,
Axial lead type choke coils and leadless type choke coils can be manufactured using the same manufacturing equipment, and integrated production of both is possible, which has great effects.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of an axial lead type choke coil manufactured by the choke coil manufacturing method of the present invention, and Fig. 2 is a leadless one obtained by cutting the outer lead wire from the axial lead type choke coil of Fig. 1. Figure 3 is a perspective view of a conductive plate member with only an inner lead wire formed, Figure 4 is a cross-sectional view of a conventional axial lead type choke coil, and Figure 5 is a diagram of a conventional axial lead type choke coil. FIG. 2 is a cross-sectional view of a wireless choke coil. 21... Core 22... Flange 23.
... Conductive plate member 24 ... Inner lead wire 25 ... Outer lead wire 26 ... Conductive resin 27 ...
...Body part 28... Winding wire 29...
・End portion 30...Resin

Claims (2)

[Claims] (1) Lead wires are provided on both sides of the conductive plate-like member, the lead wires are connected to the flanges formed on both sides of the spool-shaped core, and a wire is wound around the body of the core. The choke coil is formed by connecting an end portion of the conductive plate member to the lead wire, and covering the entire conductive plate member with resin while exposing an outer surface of the conductive plate member. (2) Lead wires are provided on both sides of the conductive plate-like member, one of the lead wires is connected to the flanges formed on both sides of the spool-shaped core, and the wire is wound around the body of the core. The end of the winding wire is connected to the one lead wire, and then the entire conductive plate-like member is coated with resin with the outer surface exposed, and the other lead wire is removed. A method for manufacturing a choke coil characterized by: