JPH05315140A - Surface mounting balun - Google Patents

Abstract

PURPOSE:To realize easy mounting onto a printed circuit board of a balun for surface mounting to be used for a distributing circuit and mixing circuit or the like of a high frequency RF unit. CONSTITUTION:End portions of lead wires 18 to 21 are led out to the outside of a through hole 15 and a film is removed to form terminals 7a to 11a. The terminals 7a to 11a are beng along a lead position indication mark 22 or lead positioning groove formed at the external wall surface of a core 14 and can be surface mounted on a land of the printed circuit board. With such structure, since connection can be realized through direct abutment on the land of the printed circuit board, automatic mounting can be done easily at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mounting balun using a core of ferrite or the like used in a distribution circuit of a high frequency RF unit such as a UHF, VHF electronic tuner, a BS tuner or the like, a mixed circuit or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
As shown in FIG. 7 of the circuit diagram, four lead wires 3, 4, 5 and 6 were wound around the provided core 2 as shown in FIG. Then, the coating on the end portion drawn out of the through hole 1 was removed and the terminals 7, 8, 9, 10, 11 were used as various input / output terminals.

[0003]

The insertion balun configured as described above is mounted on the printed circuit board 12 as shown in FIG. That is, the terminals 7 to 11 are the printed circuit board 12
It is mounted by penetrating through the through hole 13 provided in the above, and is connected to the land 14 by the solder 15. However, in this case, as is apparent from FIG. 8, it is necessary to insert the terminals 7 to 11 into the through-holes 13, respectively. Therefore, the present invention provides a surface mounting balun that can greatly simplify this mounting work.

[0004]

In order to achieve this object, the present invention comprises a core having a through hole, and one or more lead wires penetrating the through hole of the core. The terminal is formed by pulling the end portion of the core out of the through hole and removing the coating to form a terminal, and the terminal is bent along the outer wall surface of the core.

[0005]

With the above structure, the terminals are bent along the outer side of the core, and the terminals can be directly brought into contact with the land shape of the printed circuit board for connection, so that the mounting work is greatly simplified. It is a thing.

[0006]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 14 is a core made of ferrite, and two through holes 15 are arranged side by side.
The upper and lower surfaces 16 and 17 are flat and square. In order to form the circuit configuration shown in FIG. 7 in these through holes 15, four lead wires 18, 19, 20,
21 is wrapped around. Then, the coating is removed from the end portions drawn out of the through hole 15 to form terminals 7a to 11a. These terminals 7a to 11a are drawn from the through hole 15 as shown in FIG. hand,
The lower surface 17 is bent along the lead position display mark 22. As shown in FIG. 2, the mounting is performed with the lower surface 17 side of the core 14 on the printed circuit board 23 side. That is, the land 24 is provided on the upper surface of the printed circuit board 23, and the terminals 7a to 11a are brought into contact with the land 24 correspondingly, and soldering is performed in this state.
It should be noted here that the terminals 7a and 9a are bent only one unlike the other terminals 8a, 10a and 11a, which are twisted from a plurality of terminals. A gap 25 is provided between the lower surface 17 of the core 14 and the core 14 so that the attachment is properly performed. Further, as shown in FIG. 3, it is possible to form lead positioning grooves 26 on the lower surface 17 side of the core 14 in accordance with the respective terminals so that the terminals 7a to 11a of the lead wires can be positioned reliably.

(Embodiment 2) FIGS. 4 and 5 show another embodiment. In this embodiment, three lead wires 27, 28 and 29 are provided. The two terminals 30 and 31 are on the lower surface 17 side of the core 14, and the other two terminals 32 and 33 are on the upper surface 1.
The terminal 34, which is bent from the 6 side and combined from the two, has a through hole 15
It is projected in the direction. As shown in FIG. 5, only the terminal 34 is penetrated through the through hole 23a of the printed board 23 and soldered to the land 23b on the lower surface side, and the other terminals 30 to 33 are soldered to the land on the upper surface side. .. This requires a penetrating work into the through hole 23a of the printed circuit board 23, but since only one penetrating work is required, the work can be easily carried out.

[0009]

As shown in the above embodiments, the terminals are bent along the outside of the core and can be directly brought into contact with the lands of the printed circuit board for connection. Is extremely simplified.

[Brief description of drawings]

FIG. 1 is a perspective view of a surface mounting balun according to a first embodiment of the present invention.

FIG. 2 is a side view in which the surface mounting balun according to the first embodiment of the present invention is mounted.

FIG. 3 is a perspective view of a surface mounting balun with a terminal positioning groove added to the first embodiment of the present invention.

FIG. 4 is a perspective view of a surface mounting balun according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a surface mounting balun according to a second embodiment of the present invention.

FIG. 6 is a perspective view of a conventional insertion balun.

FIG. 7 is a circuit diagram of a conventional insertion balun.

FIG. 8 is a side view of a conventional insertion balun.

[Explanation of symbols]

 7a terminal 8a terminal 9a terminal 10a terminal 11a terminal 14 core 15 through hole 16 upper surface 17 lower surface 18 lead wire 19 lead wire 20 lead wire 21 lead wire 22 lead position indication mark 23 printed circuit board 24 land 25 gap 26 lead positioning groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akio Iwase 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] 1. A core having a through hole, and at least one lead wire penetrating the through hole of the core, wherein an end of the lead wire is pulled out of the through hole to remove a coating film. This is a terminal, and this terminal is a surface-mount balun that is bent along the outer wall of the core. 2. The surface mounting according to claim 1, wherein the core has a plurality of through holes arranged in a lateral direction, has a rectangular shape having flat portions on the upper and lower surfaces of the through holes, and has terminals bent on the upper and lower surfaces. Balun. 3. A core having a through hole, and two or more lead wires penetrating the through hole of the core, wherein the ends of the lead wires are pulled out of the through hole and the coating film is removed. This terminal is bent along the outer wall surface of the core according to the mark of the lead position indication on the core, and only one of these terminals is bent between it and the outer wall surface of the core. Balun for surface mounting with a gap. 4. A core having a through hole, and two or more lead wires penetrating the through hole of the core, wherein the end portions of the lead wires are pulled out of the through hole and the coating film is removed. This is a surface-mount balun that is bent along the outer wall of the core according to the lead positioning groove of the core. 5. A core having a through hole, and two or more lead wires penetrating the through hole of the core, wherein the end portions of the lead wires are pulled out of the through hole and the coating film is removed. A surface mounting balun in which at least two of the terminals are twisted and protruded toward the through hole, and the other terminals are bent outward from the through hole.