JPH0757821A - Noise filter for connector - Google Patents

Abstract

PURPOSE:To provide a connector with an LC type noise filter. CONSTITUTION:A plurality of outside electrodes 14 of feed-through capacitors 13 are commonly connected to each other via a conductor 15. The surrounding of each feed-through capacitor 13 is molded with a magnetic synthetic resin material 16. Consequently, an annular magnetic member consisting of the plurality of through capacitors 13 and the magnetic synthetic resin material 16 is integrally constituted inside a shield case 6 of a connector. As a result, it is possible to provide the connector with an LC type noise filter having a high noise eliminating characteristic without changing a capacity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise filter for a connector used mainly at an end of a connecting cable in electronic equipment.

[0002]

2. Description of the Related Art Conventionally, in electronic equipment, at a connection terminal portion of a cable for connecting electronic equipment to each other, in order to remove noise mixed in from a line of the cable, a dielectric filter, a capacitive filter, or a mixture thereof is used. A mold filter is provided for each line.

If capacitors used for a capacitive filter in this connection terminal portion are provided on the side of the wiring board of electronic equipment, the same number of capacitors as the number of cable lines are concentrated around the connection terminals, so that the mounting density of the board is high. Is reduced. Therefore, it has been attempted to provide a feedthrough capacitor in a connector for connecting a cable to an electronic device to miniaturize a capacitance type filter.

FIG. 5 shows a conventional example in which a feedthrough capacitor is incorporated in a connector to integrally form a filter and a connector, and the connector is a socket type fixed to a substrate on the electronic equipment side.

Reference numeral (01) is a socket-type connector with a feedthrough capacitor, in which the feedthrough capacitor (02) is inserted in the middle of the conductor (04) of the female contactor (03).

The lower end of the conductor (04) of the female contactor (03) penetrates the wiring board (05) of the electronic device and is soldered to a required wiring land (06).

A shield case (07) is fitted on the outer peripheral surface of the connector (01), and from the lower side of the shield case (07),
The earth connection terminal (08), which also serves as a fixing to the wiring board (05), is projected. The ground connection terminal (08) penetrates the wiring board (05) and is soldered to the ground wiring (09) on the back surface thereof.

The female contactor (03) is bent at a right angle above the conductor (04), and the bifurcated contact portion (012) at the tip thereof is inserted into the insertion hole (011) of the male contactor (010). ) Inside.

The male contactor (010) is a plug-type connector and is provided at the end of the cable (not shown).

The feedthrough capacitor (02) is previously inserted into a large number of through holes (014) provided in the conductive capacitor holding plate (013), and the periphery of the through hole (014) and the outer periphery of the feedthrough capacitor (02). electrode
(015) is soldered and electrically connected,
It is fixed to the capacitor holding plate (013).

To assemble the connector (01) with a feedthrough capacitor, the conductor of each female contactor (03) that has been assembled previously is assembled.
After passing through the through hole (016) of each through capacitor (02) in (04), the internal electrode (017) and the conductor in the through hole (016)
(04) is soldered.

After that, the portion where the capacitor holding plate (013) and the shield case (07) contact each other is soldered, and the lower end of the feedthrough capacitor (02) and the conductor (04) are sandwiched by the capacitor holding plate (013). By filling the synthetic resin (018) into the space on the lower surface side where the is exposed and protruding and the space on the upper surface where the upper end of the feedthrough capacitor (02) and the female contact (03) are exposed. The connector with feedthrough capacitor (01) has been completed.

[0013]

A plurality of feedthrough capacitors
The outer peripheral electrode (015) of (02) is commonly connected, and a capacitor holding plate (01) for holding each feedthrough capacitor (02).
The work of assembling each feedthrough capacitor (02) to 3) is not easy because the outer diameter of the feedthrough capacitor (02) is very small, 2 mm or less, and if the assembling is done manually, the assembly accuracy is improved. Is difficult.

If the mounting accuracy is poor, each feedthrough capacitor (0
The parallelism of the axis of 2) becomes uneven, and it becomes difficult to insert the conductor (04) in the subsequent work.

On the other hand, it is difficult to more strictly limit the ingress or emission of noise from the cable connected to the connector only by the capacitance of the feedthrough capacitor (C type), so that the line is inductive (L type). In order to impart the above characteristics, ferrite beads or the like are attached to each cable line. In order to form such an LC type noise filter, a ferrite bead must be provided for each line of the connector (011) with a feedthrough capacitor.

The present invention has been made in view of the above problems, and is an LC type noise in which the outer peripheral electrodes of a large number of feedthrough capacitors are commonly connected and the outer periphery of the feedthrough capacitors are firmly connected and fixed with a magnetic synthetic resin material. The purpose is to provide a filter.

[0017]

According to the present invention, the external electrodes of a plurality of feedthrough capacitors are commonly connected by a conductor, and the periphery of each feedthrough capacitor is molded with a magnetic synthetic resin material. The above problems are solved.

[0018]

Since a plurality of feedthrough capacitors and a ring-shaped magnetic material are integrally molded in a connector at the same time, a high noise removal characteristic can be obtained with the same volume.

[0019]

1 is a vertical sectional view of a connector having a noise filter according to an embodiment of the present invention, and FIG. 2 is a partially cutaway perspective view of the noise filter shown in FIG.

In the connector (1), the conductors (3) at the lower ends of the plurality of female contacts (2) are penetrated through the wiring board (4) of the electronic device, and the required wiring is provided on the wiring surface on the back surface. Soldered to the land (5).

A shield case (6) is fitted on the outer peripheral surface of the connector (1), and from the lower side of the shield case (6), a ground connection terminal (also referred to as a fixing to the wiring board (4)) is provided. 7)
Is projected. Ground connection terminal (7) is a wiring board
It penetrates through (4) and is soldered to the ground wiring (8) on its back surface.

The female contactor (2) is bent at a right angle above the conductor (3), and the bifurcated contact portion (3a) at the tip thereof is a male contactor.
It is located inside the insertion hole (10) of (9).

The male connector provided with the male contactor (9) is
It is a plug-type connector and is provided at the end of the cable (not shown).

The conductor (3) of the female contactor (2) is the wiring board (4)
Before passing through the noise filter (12) according to the present invention
Is provided.

The noise filter (12), as shown in FIG.
A plurality of feedthrough capacitors (1
3), each of the feedthrough capacitors (13) is a conductive conductor plate that forms a common electrode in the middle of the axial direction of the external electrode (14).
Commonly connected by (15).

A portion of the noise filter (12) below the conductor plate (15) surrounds each feedthrough capacitor (13) protruding below the conductor plate (15) so as to surround the magnetic synthetic resin material (16).
It is molded by.

The magnetic synthetic resin material (16) is a synthetic resin having a high magnetic permeability and an insulating property, which can be solidified by molding a magnetic powder material having a high magnetic permeability such as ferrite powder with a synthetic resin material as a binder. It is a material.

As a result, the magnetic synthetic resin material (16) surrounding each feedthrough capacitor (13) passes through the feedthrough capacitor (13) through the conductor (3) of the female contactor (2), For 3), it works like a ferrite bead.
The conductor (3) and the internal electrode (11) of the feedthrough capacitor (13)
Are soldered.

The portion of the magnetic synthetic resin material (16) in the noise filter (12) is a portion filled with a general synthetic resin material in the conventional connector with feedthrough capacitor shown in FIG. The applied connector is a conductor
No special space is used just to increase the inductive action in (3).

FIG. 4 shows another embodiment for further increasing the reactance with respect to the conductor (3). Each of the feedthrough capacitors (13) protrudes above the conductor plate (15) commonly connected. A magnetic synthetic resin material (16) is also molded around the feedthrough capacitor (13).

As a result, the effective sectional area around the axis of the magnetic synthetic resin material (16) which surrounds the conductor (3) and acts as an annular magnetic body is increased, and the electromagnetic action on the conductor (3) is increased.

The magnetic synthetic resin material (16) in the embodiment shown in FIGS. 2 and 4 comprises a feedthrough capacitor (13) and a conductor plate (15).
The lower mold part (16a) and the upper mold part (16b) are put in a molding die in advance and insert molding is carried out to make the noise filter (12) part a single part.

However, in the present invention, the feedthrough capacitor (13) and the conductor plate (15) are pre-soldered, then housed in the shield case (6), and then the lower mold part.
A magnetic synthetic resin material (16) may be filled in a space corresponding to (16a) and the upper mold part (16b) for molding.

[0034]

The present invention has the following effects. (a) An LC type noise filter connector with a large number of cable cores (lines) can be easily obtained.

(B) The shape of the LC type filter connector is
It is the same as the conventional feedthrough capacitor only.

(C) The noise filter can be easily incorporated into the connector in any manufacturing process, such as making the noise filter as a separate body or making the noise filter into an integral structure with the connector in the manufacturing process of the connector. The connector with a filter can be made smaller than the conventional one, which contributes to increasing the mounting density of electronic devices and facilitates the downsizing of the connector which is desired to be further downsized.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a feedthrough capacitor showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a connector with a feedthrough capacitor configured using the feedthrough capacitor of FIG.

FIG. 3 is a partially cutaway perspective view of a feedthrough capacitor showing another embodiment of the present invention.

4 is a longitudinal sectional view of a main part of a connector with a feedthrough capacitor configured using the feedthrough capacitor of FIG.

FIG. 5 is a longitudinal sectional view of a main part of a conventional connector with feedthrough capacitor.

[Explanation of symbols]

(1) Connector (2) Female contactor (3) Conductor (3a) Forked contact part (4) Wiring board (5) Wiring land (6) Shield case (7) Ground connection terminal (8) Ground wiring (9) ) Male contactor (10) Insertion hole (11) Internal electrode (12) Noise filter (13) Feedthrough capacitor (14) External electrode (15) Conductor plate (16) Magnetic synthetic resin material (16a) Lower mold part (16b) ) Upper mold part

Claims (3)

[Claims] 1. A noise filter for a connector, wherein the external electrodes of a plurality of feedthrough capacitors are commonly connected by a conductor, and the periphery of each feedthrough capacitor is molded with a magnetic synthetic resin material. 2. The magnetic synthetic resin material is molded only around one end of the feedthrough capacitor on one side of the conductor that commonly connects the external electrodes of the feedthrough capacitors. Noise filter for connectors. 3. The noise filter for a connector according to claim 1, wherein the magnetic synthetic resin material is molded at both ends thereof with a conductor commonly connecting external electrodes of a plurality of feed-through capacitors as an intermediate.