JPH0234821Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to 3-terminal electronic components such as 3-terminal capacitors and 3-terminal varistors that remove high frequency noise.

(Prior Art) Conventionally, this type of three-terminal electronic component (in the following explanation, for convenience, it will be explained as a three-terminal capacitor), for example, the one shown in FIG.
As shown in a plan view and a side view, respectively, in FIG.
A U-shaped conductor 5 is soldered to the electrode 2 of the capacitor 4, and both legs 5a of the conductor 5 are inserted through cylindrical ferrite beads 6, while the other electrode of the capacitor 4 is A device in which a ground terminal 7 is soldered to the terminal 3 is generally known.

As shown in FIG.
It has an equivalent circuit in which L ₆ and L ₆ are connected in series and a capacitor 4 is connected between the conductor 5 and the ground terminal 7. As can be seen from Figure 1 b,
Since it has a special shape with unevenness, it is not only difficult to automatically insert it into a printed circuit board, etc. or to package it by taping, but also has poor attenuation frequency characteristics because it uses a disk-shaped capacitor 4. There was a drawback.

(Purpose of the invention) The purpose of the invention is to provide a three-terminal electronic component with excellent characteristics, which has a compact and flat shape and is suitable for automatic insertion into printed circuit boards, packaging by taping, etc. It is.

(Structure of the invention) Therefore, in the present invention, cylindrical ferrite beads are placed at each end of a cylindrical electronic component in which electrodes are formed on the inner and outer peripheral surfaces of a cylindrical element body, respectively. are arranged close to each other in the same direction, aligned with the axis of the cylindrical electronic component, and both legs of a roughly U-shaped conductor are inserted into the through holes of these ferrite beads from one end of the ferrite beads, and the other ends of the conductor are inserted into the through holes of the ferrite beads. At the same time, this conductor is connected to an electrode on the outer circumferential surface of the element body of the cylindrical electronic component between the two legs, and is inserted into a through hole in the element body of the cylindrical electronic component to form a conductor on its inner periphery. It is characterized in that a ground conductor electrically connected to the electrode on the surface is drawn out on the same plane as the lead-out ends of the conductor from the other ends of the ferrite beads.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In Fig. 3, 11 is a cylindrical capacitor;
2 and 13 are ferrite beads, 14 is a conductor, 14
A and 14b are the legs of the conductor 14, and 15 is a ground conductor.

The cylindrical capacitor 11 has electrodes 18 and 19 formed on the inner and outer circumferential surfaces of a rectangular columnar dielectric 17 having a circular through hole 16 in its axis.

On the other hand, like the cylindrical capacitor 11, both of the ferrite beads 12 and 13 have a rectangular columnar shape having circular through holes 12a and 13a in their axial cores.
3 has a cross-sectional dimension that is lower than the height of the cylindrical capacitor 11 and approximately equal to the cross-section of the cylindrical capacitor 11 .

The ferrite beads 12 and 13 are placed on both sides of the cylindrical capacitor 11, respectively.
The ferrite beads 12, 13 are arranged approximately parallel to the cylindrical capacitor 1 and with their lower end surfaces aligned with the lower end surface of the cylindrical capacitor 11, as shown in FIG.
Both legs 14a and 14b of a conductor 14 made of a wire material such as copper having good conductivity are inserted into the through holes 12a and 13a of the cylindrical capacitor 11 between the legs 14a and 14b. The protruding portions from the upper end surfaces of the ferrite beads 12 and 13 are curved so as to be wound and soldered to the electrodes 19 of the cylindrical capacitor 11.

Further, as shown in FIG. 4, a linear ground conductor 15 is inserted into the through hole 16 of the cylindrical capacitor 11 from the lower end surface side.
is soldered to an electrode 18 formed on the inner peripheral surface of the through hole 16.

The ground conductor 15 is connected to the ferrite beads 12 and 1 on both legs 14a and 14b of the conductor 14.
It is pulled out from the cylindrical capacitor 11 on the same plane as the part pulled out from 3.

The above cylindrical capacitor 11, ferrite bead 1
2 and 13 are leg portions 14a and 14b of the conductor 14.
Then, with the ground conductor 15 facing up, it is immersed in an uncured exterior resin (not shown) and pulled up, and the exterior resin adhering to the surface is cured to provide an exterior.

The three-terminal capacitor shown in Figure 3 uses a cylindrical capacitor 11 that has better high frequency characteristics than the flat capacitor 1 (see Figures 1a and 1b), so the attenuation frequency characteristics are lower. Improved over the three-terminal capacitors of Figures 1a and 1b,
In addition, cylindrical capacitor 11, ferrite bead 1
Since 2 and 13 are arranged almost parallel,
The three-terminal capacitor has a compact and flat shape, and since there is no directionality, it is easy to automatically insert it into a printed circuit board, etc., and to package it by taping.

(Effect of the invention) According to the invention, since the ferrite beads are arranged planarly and symmetrically with the cylindrical electronic component in between,
The shape of the three-terminal electronic component becomes compact and flat, making it easy to automatically insert it into a printed circuit board or the like and package it by taping, and also improve the support strength of the terminal. Furthermore, when the present invention is applied to a 3-terminal capacitor that uses a cylindrical capacitor as a cylindrical electronic component, the cylindrical capacitor has better frequency characteristics than a disk-shaped capacitor, so the attenuation of the 3-terminal capacitor Characteristics can be improved over conventional ones. Note that the present invention is similar even if a varistor is used instead of a capacitor.

[Brief explanation of the drawing]

1a and 1b are a plan view and a side view of a conventional three-terminal capacitor, respectively, FIG. 2 is an equivalent circuit diagram of the three-terminal capacitor shown in FIGS. 1a and 1b, and FIG. A perspective view of an embodiment of the three-terminal capacitor according to the invention, FIG. 4 is a partial sectional view of the three-terminal capacitor shown in FIG. 3, and FIG. 5 is a partially sectional front view of a modification of the three-terminal capacitor shown in FIG. 3. It is. 11... Cylindrical capacitor, 12, 13... Ferrite beads, 12a, 13a... Through hole, 14
...Conductor, 14a, 14b...Legs, 15...Earth conductor, 16...Through hole, 18, 19...Electrode.

Claims (1)

[Scope of utility model registration request] A cylindrical electronic component having electrodes formed on the inner and outer circumferential surfaces of a cylindrical element body is provided with cylindrical ferrite beads on both sides of the cylindrical electronic component with their respective axes aligned with the axes of the cylindrical electronic component. Both legs of a conductor formed in a roughly U-shape are inserted into the through holes of these ferrite beads from one end of the ferrite beads and led out from the other ends of the ferrite beads. A ground conductor is electrically connected to the electrode on the outer peripheral surface of the element body of the cylindrical electronic component between the parts, and is inserted into a through hole of the element body of the cylindrical electronic component and is electrically connected to the electrode on the inner peripheral surface of the element body. A three-terminal electronic component, characterized in that the lead-out ends from the other ends of the ferrite beads are drawn out on the same plane.