JPS63274073A - Connector with core - Google Patents

Abstract

PURPOSE:To obtain a connector with a core which is inexpensive and does not radiate unnecessary electromagnetic waves by providing a ferrite core penetrated by contacts made of an electric conductor on a housing made of an insulator and providing a rear shell made of an electric conductor so as to cover this ferrite core. CONSTITUTION:A ferrite core 3 is provided at the position where contacts of a housing 1 penetrate and a rear shell 5 made of an electric conductor is provided so as to cover the ferrite core 3 in a connector constituted of the contacts 2 made of an electric conductor and the housing 1 made of an insulator. The contacts 2 made of an electric conductor penetrate the ferrite core 3, and the connector is shielded from the high-frequency electric field of the circuits on a printed circuit board 7 by the rear shell 5 made of an electric conductor. The radiation of unnecessary electromagnetic waves can be prevented by the use of a general-purpose cable, a cable can be jointly used among the equipment of the same type, and the cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a connector for electrically connecting an electric circuit to the outside, and particularly to a core-equipped connector that is effective in preventing radiation of unnecessary electromagnetic waves.

[Prior Art] FIG. 4 is a perspective view showing a conventional connector, and FIG. 5 is a sectional view taken along the line BB in FIG. 4.

In the figure, reference numeral 11 indicates a conventional connector used for the printed circuit board 7. 1 is a housing made of an insulator such as plastic and holds one or more contacts 2; 2 is a contact made of a highly elastic metal that is a good electrical conductor; 4 is a front shell of a connection part made of a metal, etc.;
6 is a set screw that fixes the front shell 4 to the housing l;
7 is a printed circuit board.

Conventionally, when connecting an external electrical device using the connector 11 as described above, there has been a problem in that harmful high-frequency electromagnetic waves are emitted from the connecting portion.

Conventionally, the following methods have been used to prevent the radiation of unnecessary electromagnetic waves.

FIG. 6 is a plan view showing an example of conventional measures for preventing radiation of unnecessary electromagnetic waves.

In the figure, 7 is a printed circuit board having a printed circuit and the conventional connector 11 is attached to it, and 8 is a printed circuit board with the connector 1 attached thereto.
1, a ferrite core 9 is provided at the end of the cable 8 so that the cable 8 passes through the cable 1;
2 is a cable connector provided at the end of the cable 8.

Since the cable 8 passes through the ferrite core 9 in this manner, the ferrite core 9 is equivalent to the presence of a filter circuit, and radiation of unnecessary electromagnetic waves can be prevented.

FIG. 7 is a perspective view showing another example of conventional measures for preventing the radiation of unnecessary electromagnetic waves, in which 11 is the conventional connector shown in FIG. 4, 10 is a ferrite core provided on the printed circuit board 7; The lead wires connected to each of the contacts 2 pass through the ferrite core IO and then are connected to the printed circuit. This ferrite core
O is equivalent to the presence of a filter circuit, and unnecessary radiation of high frequency electromagnetic waves can be prevented.

[Problems to be Solved by the Invention] Since the conventional connector 11 is configured as described above, unnecessary electromagnetic waves are radiated from the connecting portion.

In order to prevent this, a method using a special cable in which the cable 8 passes through the ferrite core 9 as shown in Fig. 6 is used, but the cable is special and has to be produced in small quantities compared to general use, making it expensive. Another problem is that when a general cable is connected to a Ja equipment that does not have the above-mentioned special cable, unnecessary electromagnetic waves are emitted.

Further, in the method of providing the ferrite core 10 near the connector 11 shown in FIG. 7, the development period of the printed circuit board 7 becomes long, and the area of the printed circuit board 70 increases because of the area occupied by the ferrite core IO. Furthermore, when the ferrite core 10 is provided on the printed circuit board 7, the effect of the ferrite core 10 will not be realized unless the circuit including the ferrite core 10 and the connector is shielded from the high frequency electric field that is unnecessary radiation of the circuit on the printed circuit board 7. Since there is no electric field shielding plate, it is necessary to provide an electric field shielding plate or to separate it from the electric field far away, which poses a problem in that the cost of the printed circuit board 7 increases.

This invention was made to solve these problems, and aims to provide a core-equipped connector that can connect general cables, is the same size as conventional connectors, is inexpensive, and does not emit unnecessary electromagnetic waves. purpose.

[Means for Solving the Problems] A cored connector according to the present invention includes a ferrite core through which electrically conductive contacts pass through an insulator housing, and a rear shell made of an electrically conductive material to cover the ferrite core. The structure is such that the following is provided.

[Function] In the core-equipped connector of the present invention, since the contact made of a good electrical conductor passes through the ferrite core, it is equivalent to inserting a filter circuit as shown in FIG. Since the rear shell shields the ferrite core from the high frequency electric field of the circuit on the printed circuit board, the effect of the ferrite core can be achieved even if the mounting density of the printed circuit board is increased.

[Example] Fig. 1 is a perspective view showing a connector with a core which is an embodiment of the present invention, Fig. 2 is a perspective view showing a state in which the rear shell of Fig. 1 is removed, and Fig. 3 is a perspective view showing a state in which the rear shell of Fig. 1 is removed. It is a sectional view taken along the line A-A of FIG. The same or equivalent parts as in FIG. 40 are indicated using the same reference numerals, and detailed explanation thereof will be omitted.

In the figure, numeral 3 is a ferrite core, which has a plurality of holes drilled through it through which the contacts 2 can pass through the housing l.
It is buried in Reference numeral 5 denotes a rear shell made of a good electrical conductor such as metal and formed in a shape to cover the periphery of the ferrite core 3.

The action of the L ferrite core 3 produces the effect of inserting the filter circuit shown in FIG. Since it is shielded from electric fields, it is possible to prevent the radiation of unnecessary electromagnetic waves.

[Effects of the Invention] As explained above, the present invention is configured such that the electrically conductive contacts of the connector penetrate the ferrite core, and the rear shell made of the electrically conductive material is provided to cover the ferrite core. Prevents the radiation of unnecessary electromagnetic waves.

With the connector of this invention, there is no need for a special cable that passes through the ferrite core, and it is possible to use a general-purpose cable to prevent unnecessary electromagnetic wave radiation, making it possible to share cables between devices of the same type. This makes it possible to reduce costs.

In addition, a ferrite core is installed on a conventional printed circuit board,
Compared to the method of preventing the radiation of unnecessary electromagnetic waves by passing the lead wire between the contact and the circuit through the ferrite core, it is possible to prevent the radiation of unnecessary electromagnetic waves by simply replacing the conventional connector with the connector with the core of this invention. This has excellent effects such as eliminating the need to extend development time due to revisions to the printed circuit board, and reducing cost by saving the area for installing the ferrite core and shielding plate on the printed circuit board. .

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a connector with a core that is an embodiment of the present invention, Fig. 2 is a perspective view showing a state in which the rear shell of Fig. 1 is removed, and Fig. 3 is a line A-A in Fig. 1. 4 is a perspective view showing a conventional connector, and FIG.
6 is a plan view showing an example of a conventional measure to prevent the emission of unnecessary electromagnetic waves; FIG. 7 is a perspective view showing another example of the conventional measure to prevent the emission of unnecessary electromagnetic waves. , FIG. 8 is a diagram showing a filter circuit equivalent to the case where the conducting wire passes through the ferrite core. In the figure, l...housing, 2...contact, 3...ferrite core, 4...front shell, 5...
... Rear shell, 6... Set screw, 7... Printed circuit board, 8... Cable, 9. IO...ferrite core, 11...connector, 12...cable connector. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A connector comprising contacts of good electrical conductor and a housing of insulator, characterized in that a ferrite core is provided in the housing at a position through which the contact passes, and a rear shell made of a good electrical conductor is provided to cover the ferrite. Connector with core.