JPH02247992A - Filter connector - Google Patents

Abstract

PURPOSE:To prevent receiver malfunction by inserting electrostatic capacity between a driver terminal and a signal ground in the vicinity of the terminal and providing effective bypass of a high-frequency component contained in an electric signal generated by the driver to the signal ground. CONSTITUTION:Two terminals 4, 4' belonging to a group of connector terminals for a filter connector are connected to either a receiver C or a signal ground line 12, and the terminal 4' is connected to a driver A. The terminal 4' penetrates a filter element 1' to electrically connect to an inner peripheral electrode 3' of the element 1'. In order to have an outer peripheral electrode 2' of the element 1' connected electrically to an earth plate 8', connection is made to a signal ground 12', thus resulting in connection to a signal ground terminal 12'. In addition, penetration by the terminal 4 connected to a receiver C is such that electrostatic capacity with the signal ground is reduced with respect to the earth plate 8', thereby effectively bypassing a high-frequency component contained in a signal generated in the driver A.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a filter connector that has a filter function in the connector, and for the purpose of preventing electromagnetic interference in electronic equipment, connects a filter element that removes unnecessary frequency components. , for a group of connector terminals on the input side in a metal shell, and for a group of connector terminals on the output side [Industrial Application Field] The present invention relates to a filter connector having a filter function in the connector.

Recently, as a means to prevent electromagnetic wave interference, particularly in electronic devices, a filter connector has been developed in which a filter element for removing unnecessary frequency components is incorporated into an interface connector for connecting electronic devices.

[Conventional technology]

An external view of a conventional filter connector is shown in FIG. 6. The outer periphery of the connector is surrounded by a front shell 5 and a back shell 6 made of metal, and as shown in the cross-sectional view of FIG. 5, contacts 9, Terminal 4 and filter element 1 are built-in.

The filter element l can be, for example, a cylindrical capacitor, L
It consists of a C filter or the like, and has a capacitance between the inner circumferential surface electrode 3 and the outer circumferential surface electrode 2 of the cylindrical element. The inner peripheral surface electrode 3 is electrically connected to the terminal 4, and the outer peripheral surface electrode 2
is electrically connected to the ground plate 8, thereby forming a capacitance between the terminal and the frame ground.

Such a filter connector is connected to the frame ground lO
The mounting part of the cable is connected to the housing of the electronic device, and serves to bypass high-frequency noise transmitted through the cable.

FIG. 4 is a diagram showing the concept of the circuit and shielding state when devices (1) and (2) are connected via a filter connector.

The signal emitted from driver A is sent from connector a to signal line 11.
(Shielded cable 15) → passes through connector b and reaches receiver B. An electric signal flows through a signal line 11 and a signal ground line 12 as a return line, forming an electric circuit.

The capacitance built into the filter connector is inserted between each signal line and signal ground line and the frame ground connected to the casing, and bypasses high frequency components entering the shielded cable from outside to the casing. ing.

[Problem that the invention seeks to solve]

Capacitance CA connected to the output terminal of driver A.

is inserted between the connector terminal and the frame ground, so the high frequency component included in the electrical signal emitted by driver A is routed from driver A → capacitance CAI → housing → electrostatic capacitance, as shown by path T in Figure 4. It flows from the capacitor C0 to the signal ground 12.

For this reason, a problem has arisen in that the housing becomes a source of electromagnetic radiation, which adversely affects other electronic devices.

[Means for solving problems]

FIG. 1 is a diagram explaining the principle of the present invention. This figure is compared with the figure illustrating the problems of the conventional example shown in FIG.

In the device ■ shown in Fig. 1, the capacitance C□° connected to the output terminal of driver A is inserted between the connector terminal and the signal ground, and the capacitance C□° connected to the output terminal of driver A is inserted between the connector terminal and signal ground. , there is a capacitance CA! between the casing and the connected frame ground. , CA, are inserted.

CAR and CaS conduct cables as in the conventional case,
This is inserted to bypass noise that adversely affects receiver A to the housing.

[Effect]

In the present invention, since a capacitance is inserted between the terminal of the driver and the signal ground in the vicinity of the terminal of the driver, the high frequency component contained in the electric signal generated by the driver is effectively bypassed to the signal ground.

〔Example〕

FIG. 2 is a configuration diagram of an embodiment of the present invention, showing a sectional view of the inside of the filter connector.

In the figure, two terminals 4.4° of the connector terminal group are shown, of which terminal 4 is connected to receiver C or signal ground line 12, and terminal 4' is connected to driver A.

The connector terminal 4'' connected to the driver A passes through the filter element 1° and is electrically connected to the inner peripheral surface electrode 3''.The outer peripheral surface electrode 2' of the filter element 1' is electrically connected to the ground plate 8''. Therefore, it is connected to the signal ground terminal 12°, which will be described later in the explanation of FIG.

The grounding plate 8 is located within the shell of the connector and is electrically connected to the back shell and connected to the outer peripheral surface electrode 2 of the filter element 1 . A terminal 4' connected to the driver passes through the ground plate 8 so that the capacitance between it and the frame ground 10 is small, and is connected to a contact 9.

The terminal 4 connected to the receiver is connected to the ground plate 8'',
It penetrates so that the capacitance with the signal ground is small.

FIG. 3 is a diagram showing the appearance of the embodiment having the cross section shown in FIG. 2. FIG. A ground plate 8 is located behind the back shell 6, in front of the figure.
", and filter elements 1" are housed in correspondence to the number of driver circuits.

Further, a signal ground terminal is provided that can be soldered to a signal ground of a printed wiring board or the like.

〔Effect of the invention〕

According to the present invention, it is possible to remove the high frequency components contained in the electric signals generated by the driver without flowing them into the housing, and there is no possibility of radiating electromagnetic waves to the outside. Furthermore, by bypassing noise conducted from the outside to the housing at the receiving end of the receiver, it is possible to prevent the receiver from malfunctioning.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the principle of the present invention, Fig. 2 is a sectional view of a filter connector showing an embodiment, Fig. 3 is an external view of the embodiment, Fig. 4 is an explanatory diagram of a conventional example, and Fig. 5 6 shows a sectional view of the conventional example, and FIG. 6 shows an external view of the conventional example. In the figure: 1.1” 2.2゛3.3” 4.4゜8.8゛12゜12” Filter element outer circumference electrode inner circumference electrode connector terminal front shell pack shell metal shell earth plate contact frame ground signal Line signal ground signal ground line signal ground terminal housing insulator shielded cable.

Claims (1)

[Claims] one or more connector terminals (4), in which the outer electrode (2) of the filter element (1) is connected to the metal shell (7) of the connector, and the outer electrode (2') of the filter element (1'); one or more connector terminals (4') connected to earth on the outside of the metal shell (7) of the connector.
) A filter connector characterized by comprising: