JPH0346582Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Technical field] The invention is based on EMI (Electro Magnetic Interchange).
The present invention relates to a T-type filter consisting of a combination of a capacitor and a cylindrical magnetic material suitable as an electromagnetic interference removal filter, that is, an electromagnetic interference removal filter.

[Prior Art] A T-type filter consisting of a pair of inductances L ₁ and L ₂ and one capacitor C as shown in FIG. 1 is well known as a typical EMI removal filter. As shown in FIGS. 2 to 4, this type of T-type filter is provided with a pair of capacitor electrodes 2 and 3 on both sides of a disc-shaped dielectric ceramic substrate 1, and from one electrode 2 to the first The lead wire 4 is led out, and the second and third lead wires 5 and 6 are led out from the other electrode 3, and the second and third lead wires 5 and 6 are connected to a pair of cylindrical magnetic materials such as ferrite. 7,
8, that is, by inserting them into respective through holes 9 and 10 of the bead core.

By the way, when configured as shown in FIGS. 2 to 4, it is not only impossible to arrange the three lead wires 4, 5, and 6 in a straight line (on one plane), but also The work required to set the positional relationship of the lead wires 4, 5, and 6 constant has become complicated. That is, in order to combine a flat capacitor made of a dielectric ceramic substrate 1 and cylindrical magnetic bodies 7 and 8 whose shape is significantly different from that of the flat capacitor, three lead wires 4, 5, and 6 are connected. Not only is it difficult to keep the mutual spacing constant, but the three lead wires 4, 5, and 6 are arranged in a zigzag pattern. Therefore, it is difficult to form a component array in which the lead wires 4, 5, and 6 of a plurality of filters are each adhered to a common tape, and to automatically supply the filters (circuit components) to the circuit board. Ta.

[Purpose of the invention] Therefore, the purpose of the invention is to make assembly easy;
Another object of the present invention is to provide a filter that can be easily transported and supplied to a circuit board.

[Structure of the invention] The present invention for achieving the above object will be described with reference to the reference numerals in the drawings showing the embodiments. first and second cylindrical magnetic bodies 21 and 22 that are juxtaposed and fixed to the cylindrical capacitor 11, respectively;
and a capacitor lead wire 18 connected to one electrode of the cylindrical capacitor 11 and led out linearly in the axial direction of the cylindrical capacitor 11.
and a first inductance-side lead portion 19a having a portion inserted into the through hole 23 of the first cylindrical magnetic body 21 and extending parallel to the capacitor lead wire 18; The capacitor lead wire 1 has a portion inserted into the through hole 24 of the second cylindrical magnetic body 22.
8, a second inductance side lead portion 20a extending parallel to the cylindrical capacitor 11, and a portion connected to the other electrode of the cylindrical capacitor 11, and each of the portions are electrically connected to each other. and a center line extending in the axial direction of the cylindrical capacitor 11 and the first and second cylindrical magnetic bodies 2.
The cylindrical capacitor 11 and the first and second cylindrical magnetic bodies 21 and 22 are arranged such that the center lines extending in the axial direction of the cylindrical capacitors 1 and 22 are located on substantially the same plane.
is arranged, and the capacitor lead wire 18
The present invention relates to a filter characterized in that the first and second inductance side lead portions 19a and 20a are arranged substantially on the same plane.

[Effects of the idea] The present invention has the following effects.

(b) Three cylindrical bodies consisting of a cylindrical capacitor 11 and a pair of cylindrical magnetic bodies 21 and 22 are used as the main components of the filter, and these are arranged so that their center lines are located on the same plane. Since they were juxtaposed,
These integrations can be easily achieved. Further, the capacitor lead wire 18 and the first and second inductance side lead portions 19a,
It becomes possible to easily make the mutual spacing between the 20a constant.

(b) Since the capacitor lead wire 18 and the first and second inductance side lead portions 19a, 20a are arranged on the same plane, a component arrangement in which multiple filter leads are bonded to a common tape is possible. This makes it possible to form a body and facilitate the transport of the filter or the automatic feeding of the circuit board.

[Embodiment] Next, a T-type EMI removal filter according to an embodiment of the present invention will be described with reference to FIGS. 5 to 8. When constructing this T-type filter, first, a cylindrical magnetic capacitor 1 as shown in FIGS.
Prepare 1. This cylindrical porcelain capacitor 11
The porcelain 12 has a cylindrical porcelain 12, an internal electrode 13 continuously provided on the inner peripheral surface, one end surface, and one end of the outer peripheral surface of the cylindrical porcelain 12, and a portion facing the internal electrode 13. an external electrode 14 provided so as to include the other end of the outer peripheral surface of the external electrode 14; one metal cap 15 coupled to the external electrode 14; and an internal electrode 1
3 and an insulating coating layer 17. A first lead wire 18 is electrically and mechanically connected to one of the metal caps 15 by welding and extends linearly in the axial direction of the cylindrical ceramic capacitor 11. 1
9 and 20 are second and third lead wires, and the center of one common lead wire is connected to the other metal cap 1.
They are mechanically and electrically connected by welding to the apexes of 6. 5 and 6, the lead wires 19 and 20 extend in a direction perpendicular to the axial direction of the capacitor 11, but as shown in FIG. and are bent so as to have portions 19a and 20a extending parallel to the first lead wire 18, respectively.

The portions corresponding to the inductances L ₁ and L ₂ in FIG.
It is constructed by inserting second and third lead wires 19 and 20 through the 22 through holes 23 and 24. At this time, the first, second and third lead wires 1
8, 19, and 20 are preferably led out in the same direction at a predetermined interval for connection to an external circuit. , 19, and 20 are set to a predetermined value. Cylindrical magnetic bodies 21, 22
are arranged in parallel to the ceramic capacitor 11, and are fixed to the capacitor 11 by adhesives 25 and 26 substantially without intervening spacers. As a result, the 8th
As shown in the figure, three lead wires 18, 19, and 20 are arranged in a straight line (on the same plane). The capacitor lead wire 18 and the first and second inductance side lead portions 19a and 20a are led out from the center of the cylindrical capacitor 11 and the first and second cylindrical magnetic bodies 21 and 22, and are substantially on the same plane. It is located in Further, as is clear from FIGS. 7 and 8, the center line extending in the axial direction of the capacitor 11 and the center lines extending in the axial direction of the first and second cylindrical magnetic bodies 21 and 22 are on the same plane. positioned. still,
If necessary, it may be molded with an insulator or housed in a case as shown by the chain line 27.

As is clear from the above, the T type of this example
EMI suppression filters have the following advantages:

(A) Cylindrical ceramic capacitor 11 and cylindrical magnetic body 2
1 and 22 are placed side by side with each other so that their center lines extending in the axial direction are located on the same plane, and are integrated using adhesives 25 and 26, so that integration is easily achieved. You can. In addition, it becomes possible to arrange the three lead wires 18, 19, 20 on the same plane, and the cylindrical capacitor 11 and the magnetic body 21, 2
Since the mutual distance between the capacitor lead wire 18 and the first and second inductance side lead portions 9a, 20a is determined by the distance between the center axes of the capacitor 2, it is possible to set the mutual distance between them to a predetermined value. becomes easier.

(B) Since the capacitor lead wire 8 and the first and second inductance side lead portions 19a, 20a are arranged in a straight line (on the same plane) as shown in FIG. It becomes possible to easily adhere to tape. Therefore, it is possible to construct a component array in which the leads of a plurality of filters are adhered to a common tape, and to easily accomplish transportation of components (filters) and automatic feeding to a circuit board.

[Modifications] (a) Instead of forming the second and third lead wires 19 and 20 with a common lead wire as shown in FIG. 5, they are formed independently on the metal cap 16 as shown in FIG. The two lead wires 19 and 20 may be welded together.

(b) instead of or to aid in the bonding by the adhesives 25, 26, the 10th
As shown in the figure, the capacitor 11 and the magnetic body 21 are connected by a synthetic resin tube 28 that stretches elastically.
22 may be integrated.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing a T-type filter, Figure 2 is a plan view showing a conventional T-type filter, and Figure 3 is a circuit diagram showing a conventional T-type filter.
FIG. 4 is a front view of the filter shown in FIG. 5 is a partial sectional view, FIG. 7 is a plan view of the completed T-type filter, FIG. 8 is a front view of the filter shown in FIG. 7, and FIG. 9 is a plan view showing a modification of the lead wire lead-out method. , FIG. 10 is a front view showing a modification of the T-type filter. 11... Cylindrical porcelain capacitor, 15... One metal cap, 16... Other metal cap,
18... First lead wire, 19... Second lead wire, 20... Third lead wire, 21, 22... Cylindrical magnetic body, 23, 24... Through hole, 25, 26...
...adhesive material.

Claims (1)

[Claims for Utility Model Registration] A cylindrical capacitor 11 having a pair of electrodes; 2 cylindrical magnetic bodies 21 and 22; and a capacitor lead wire 18 connected to one electrode of the cylindrical capacitor 11 and led out linearly in the axial direction of the cylindrical capacitor 11.
and a first inductance side lead portion 19a having a portion inserted into the through hole 23 of the first cylindrical magnetic body 21 and extending parallel to the capacitor lead wire 18; Second
The capacitor lead wire 18 has a portion inserted into the through hole 24 of the cylindrical magnetic body 22.
has a second inductance side lead portion 20a extending parallel to the cylindrical capacitor 11, and has a portion connected to the other electrode of the cylindrical capacitor 11;
Each of the parts is composed of one or more lead wires 19 and 20 that are electrically connected to each other, and the center line extending in the axial direction of the cylindrical capacitor 11 and the first and second cylindrical magnetic The cylindrical capacitor 11 and the first and second cylindrical magnetic bodies 21,
22 is arranged, and the capacitor lead wire 18 and the first
and second inductance side lead portion 19a,
20a are arranged substantially on the same plane.