JP2785309B2 - connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a connector for an interface in which contacts are arranged in a plurality of rows. A shield effect is used to reduce crosstalk between the contact rows, and a capacitance between the contacts and the ground. With a plurality of contacts having a contact portion and a terminal portion bent in an L-shape, and a terminal array member, It has a three-layer structure in which an insulator for arranging and holding the contact portions in a plurality of rows, a metal shell surrounding the contact portion and surrounding the insulator, and a dielectric member laminated on both surfaces of a conductive plate. An L-shaped shield plate, wherein the contact has a contact portion accommodated in the insulator, a terminal portion extending from the insulator, and an end portion having the terminal arrangement member. The shield plate is disposed on the terminal arrangement member along the terminal portion over the entire length of the terminal portion in the column direction without contacting the terminal portion, and one end is connected to the metal shell. , And the other end is supported by the terminal arrangement member.

[Industrial applications]

The present invention relates to a connector for an interface in which a plurality of rows of contacts are arranged on an insulator.

2. Description of the Related Art In recent years, with the spread of digital electronic devices, noise in the devices has been radiated to the outside, and the operation of other electronic devices has been adversely affected. Therefore, EMI (Electro-Magnetic I
It is important to take countermeasures against electromagnetic interference. Accordingly, a technique for providing a connector to which an input / output cable is connected with a noise prevention function to cut off the inside of the apparatus and the external cable with respect to noise has been frequently used.

Further, with the increase in the density of connectors and the speed of transmission signals, crosstalk between adjacent contacts has become a problem due to crosstalk between adjacent contacts.

[Conventional technology]

FIG. 3 is a perspective view showing a conventional connector with a shield plate used for interface connection of the device.

In the figure, reference numeral 1 denotes a plurality of contacts, for example, a male contact portion 11 inserted into a contact of a mating connector.
Terminal part 12 which is bent into L-shape and connected to a printed board etc.
A plurality of rows in which a plurality of the contacts 1 are arranged in an example are implanted at a predetermined pitch in the insulator 3 and are surrounded by the metal shell 2. The metal shell 2 is composed of a front shell 21 surrounding the contact portion 11 side of the contact and a rear shell 22 surrounding the fixing portion. And is connected to the ground potential of the signal transmission system. The insulator 3 is made of a molded product of an organic material or the like, and maintains a predetermined arrangement by penetrating the contact 1. A terminal array member 4 having substantially L-shaped mounting portions 41 on both ends is attached to the rear surface of the insulator 3 by screws 23 together. The terminal array member 4 is made of an insulating material, and has a through hole for penetrating the vicinity of the terminal end of the contact and aligning it at a predetermined pitch, a fastening hole for mounting on a printed board, and the like.

Then, between the plurality of contact rows (two rows in the figure), L
A shield plate 5 made of a conductive material bent in a letter shape is inserted so as to block between the terminal rows, and is connected to the rear end face of the back shell 22 or the like to be at the ground potential. Since this shield plate shields between the contact rows, even when a high-speed signal is transmitted, no crosstalk occurs between the contact rows, and the contact rows can be arranged with high density.

[Problems to be solved by the invention]

However, the above-mentioned conventional connector with a shield plate has almost no function of filtering a noise component which is superimposed on a signal and transmitted inside the contact.

That is, the terminal portion of the contact is electrically coupled to the shield plate via the stray capacitance, and the high-speed component of noise passing through the contact is slightly bypassed to the ground plate by the stray capacitance. Since the capacity is extremely small, there is a problem that the noise removing function is not sufficient.

On the other hand, a connector with a filter has been proposed to further improve the noise suppression function of the connector. This is achieved by penetrating an annular capacitor element having electrodes on the inner and outer peripheral walls of an annular dielectric through terminal portions of the contacts, connecting the contacts to the inner electrodes, connecting the outer electrodes to the ground, A capacitor element having a predetermined capacity is connected between the ground and the ground, and a high frequency component of noise is bypassed to the ground and blocked at the connector. However, in this case, there is a problem in crosstalk because the shielding effect between the contacts is not sufficient, and there is also a problem that the cost is high because the capacitor element is penetrated into each contact.

The present invention has been made in view of the above problems, and by providing a ground plate having a dielectric layer between contact rows, a shield effect is provided, crosstalk is reduced, and a gap between the contact and the ground is provided. It is an object of the present invention to provide a connector having a noise rejection function by increasing the electrostatic capacity of the device and improving a bypass characteristic for a noise signal.

[Means for solving the problem]

The above problem has a plurality of contacts having a contact portion and a terminal portion bent in an L shape, and a terminal arrangement member,
It has a three-layer structure in which an insulator for arranging and holding the contact portions in a plurality of rows, a metal shell surrounding the contact portion and surrounding the insulator, and a dielectric member laminated on both surfaces of a conductive plate. An L-shaped shield plate, wherein the contact has a contact portion accommodated in the insulator, a terminal portion extending from the insulator, and an end portion located at the terminal arrangement member, The shield plate is disposed between the male portion rows along the terminal portion over the entire length of the terminal portion in the column direction without contact with the terminal portion, one end is connected to the metal shell, and the other end is The problem is solved by adopting a structure supported by the terminal array member.

[Action]

Since the conventional shield plate is composed of only one layer of conductive material, the space between the contact terminal portion and the shield plate is separated by an air layer having a dielectric constant ε of 1 to form a space between the contact and the shield plate. Although the capacitance to be produced was extremely small only due to the stray capacitance, in the present invention, the capacitance of the dielectric material layer interposed on both surfaces of the shield plate increased, and a large-capacitance capacitor element was placed between the contact and the ground. It is equivalent to connecting. For this reason, the impedance to common mode noise generated between each signal line and the ground is reduced, the high-frequency noise component transmitted through the contact is easily bypassed to the ground, and the noise penetrates into the device through the connector or is external to the device. Can be prevented.

Also, since the shield plate is provided between the terminal rows, it has a shielding effect of preventing crosstalk between the contact rows,
Even if the interval between the contact rows is narrowed to increase the density, the transmission characteristics of high-speed signals do not deteriorate.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a connector of the present invention, and FIG. 2 is a sectional view of the connector of the present invention. The same object is denoted by the same reference numeral throughout the drawings.

The feature of the connector of the present invention lies in the shield plate inserted between the contact rows, and the other parts are the same as those of the conventional connector with the shield plate described above with reference to FIG.

In FIG. 1, a shield plate 6 inserted as shown by an arrow A between rows of terminal portions 12 of a plurality of contacts 1 implanted in an insulator 3 is made of a conductive plate material such as a copper alloy. In accordance with the bent shape, a conductive plate 61 bent in, for example, an L shape, and a dielectric member 62 of a predetermined thickness made of a ferroelectric material such as barium titanate are attached or adhered to both surfaces thereof. It has a three-layer structure. And the conductive plate 61
A tongue-shaped contact piece 61a electrically connected to both sides of the metal rear shell 22 is provided on the side surface of the end portion that comes into contact with the insulator 3 as shown in FIG. When both ends of the shield plate 6 are fitted in the positioning grooves 31 and 42 formed in the terminal arrangement member 4 and inserted between the contact rows, the conductive plate is connected to the ground potential.

As described above, since the dielectric member 62 made of a ferroelectric material exists thickly on the surface of the conductive plate 61 connected to the ground, the contact between the terminal portion of the contact and the conductive plate is compared with the case where only the air layer exists. And the capacitance between the conductive plate and
The bypass effect on high-frequency noise increases, and the noise rejection function improves.

By appropriately setting the thickness of the dielectric layer and appropriately setting the gap between the contact conductor and the surface of the dielectric layer, the capacitance of the equivalent bypass capacitor connected to the contact can be set to a desired value.

〔The invention's effect〕

As described above, according to the connector of the present invention, crosstalk between a plurality of contact rows is reduced by shielding with a ground plate, and a large capacitance between the contact and the ground is formed to pass through the contact. This makes it possible to provide an interface connector that can remove high-frequency noise components in the common mode and has an excellent EMI removal effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a connector of the present invention, FIG. 2 is a sectional view of the connector of the present invention, and FIG. 3 is a perspective view of a conventional connector with a shield plate. In the drawing, 1 ... contact, 11 ... contact portion, 12 ... terminal portion, 2 ... metal shell, 21 ... front shell, 22 ... back shell, 3 ... insulator, 4 ... terminal arrangement member , 5,6 ... shield plate, 61 ... conductive plate, 61a ... tongue-shaped contact piece, 62 ... dielectric member.

Claims (1)

(57) [Claims] A plurality of contacts having a contact portion and a terminal portion bent in an L-shape; an insulator having a terminal arrangement member; and an insulator for holding the contact portions in a plurality of rows; and surrounding the contact portion. A metal shell attached around the insulator; and an L-shaped shield plate having a three-layer structure in which a dielectric member is laminated on both sides of a conductive plate. The terminal portion is housed in the body, the terminal portion is led out of the insulator, and the end portion is located on the terminal arrangement member. The shield plate is in non-contact with the terminal portion and the total length of the terminal portion in the row direction. A connector arranged between the terminal rows along the terminals, one end connected to the metal shell, and the other end supported by the terminal arrangement member.