JPH05275139A - Connector - Google Patents

Abstract

PURPOSE:To shorten the delay time in signal transmission and preclude deterioration of the waveform of the transmitted signal by relieving reflex noises and cross-talk noises on a signal transmission line. CONSTITUTION:Signal pins 31 and ones 41 of connector member 30/40 are surrounded each with a mass of insulator part 32/42 made of a material having low dielectric constant or a material having a small dielectric tangent without provision of any protruding part into the air. Those portions of signal pins 31/41 which are situated in the respective insulator mass 32/42, are isolated magnetically by a metal shield plate 34/44 while they are grouped into a combination of signal pins to perform differential signal transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector used for connecting printed wiring boards to each other, and more particularly to a two-piece type connector used for high speed signal transmission.

[0002]

2. Description of the Related Art Conventionally, a connector used for connecting a mother board and a daughter board has the following structure.

FIG. 3 is a sectional view showing the structure of such a connector. In the figure, 10 is a male side connector mounted on the motherboard M, and 20 is a female side connector mounted on the daughter board D. In addition, each connector 1
In 0 and 20, 11 and 21 respectively indicate connector signal pins, and each connector signal pin 11 and 21 is fixed while being surrounded by insulators 12 and 22 made of reinforced plastic such as engineering plastic. .. Further male connector 10
The insulator portion 12 has a recess 12 for connecting the connector.
a is provided, and the female connector 2 is provided in the recess 12a.
The connectors 10 and 20 are connected by inserting a part of the distal end of the insulator portion 22 of No. 0.

However, in the connector having such a structure, the insulator portions 12 and 22 of the respective connectors 10 and 20 and the protruding portion in the air of the connector signal pin 21 (between the female connector 20 and the daughter board D) are arranged. There is a problem in that the characteristic impedance of the signal transmission line becomes discontinuous due to the change in the dielectric constant, and reflection noise is generated due to the discontinuity. Further, in this connector, crosstalk noise may occur in the insulator portions 12 and 22 of the connectors 10 and 20 due to mutual coupling of the connector signal pins. These noises are
It has been a factor that has a great adverse effect on the realization of high-speed signal transmission, such as delaying the signal transmission and deteriorating the rising of the transmission signal waveform.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and reduces reflection noise and crosstalk noise on a signal transmission line to shorten the delay time of signal transmission. Another object of the present invention is to provide a connector capable of preventing deterioration of a transmission signal waveform.

[0006]

In order to achieve the above-mentioned object, a connector of the present invention comprises a pair of connectors for electrically connecting printed wiring boards to each other, and a plurality of connectors connected to the wiring on the printed wiring boards. Of the connector signal pin, an insulator part for fixing the connector signal pin in a state where the connector signal pin is entirely surrounded, and a magnetic signal for each combination of a plurality of connector signal pins for differential signal transmission of each connector signal pin in the insulator part. It is characterized by having a metal shielding plate that is separated from the above.

[0007]

According to the connector of the present invention, the characteristic impedance of the connector signal transmission line can be made equal by surrounding the connector signal pin with the insulator portion without providing the protruding portion in the air, and thereby the reflection can be achieved. Noise can be reduced. Furthermore, the connector signal pins in the insulator section are surrounded by a metal shield plate for each combination of a plurality of connector signal pins that perform differential signal transmission, and are magnetically isolated to prevent crosstalk noise between the connector signal pins. Can be relaxed. This makes it possible to realize a connector suitable for high-speed signal transmission.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view for explaining the structure of a connector according to an embodiment of the present invention. In the figure, 30 is a male connector mounted on the motherboard M, and 40 is a female connector mounted on the daughter board D. In each connector 30, 40, 31, 41
Indicates connector signal pins connected to the wirings on the boards M and D, respectively.
1 is an insulator portion 32, 42 made of a material having a low dielectric constant such as a fluororesin or a material having a small dielectric loss tangent.
By this, it is fixed in a state where it is entirely surrounded without providing a protruding portion in the air. The insulator parts 32 and 42 are surrounded by outer casings 33 and 43 made of reinforced plastic such as engineering plastic. The connector signal pins 31 and 41 of the connectors 30 and 40 are connected to the mother board M and the daughter board D, respectively.
Are connected to each through hole.

FIG. 2 is a view showing a coupling surface of the male side connector 30 and the female side connector 40. As shown in the figure, in the connector of this embodiment, two connector signal pins 31 and 41 for performing differential signal transmission are set as one set, and these two connector signal pins 31 and 41 are all adjacent to each other. The setting is arranged as follows. The connector signal pins 31 and 41 of each set are provided with a plurality of metal shield plates 34 and 44, which are respectively connected to GND, in the insulator portions 32 and 42.
It is surrounded by and is magnetically isolated.

Therefore, according to this connector, the connector signal pin 31 and the connector signal pin 31 are formed by the insulator portions 32 and 42 made of a material having a low dielectric constant or a material having a small dielectric loss tangent.
By covering all parts of 41 (by eliminating the protruding parts of the connector signal pins 31, 41 in the air),
It is possible to match the characteristic impedances of the connector signal transmission lines, and this can reduce reflection noise.

By molding the insulator parts 32 and 42 of the connectors 30 and 40 with a low dielectric constant material,
The delay time of signal propagation can be shortened and the deterioration of the rising edge of the signal waveform can be reduced.

Further, the connector signal pins 31 and 41 in the insulators 32 and 42 are used for differential signal transmission 2.
By surrounding each of the connector signal pins 31 and 41 of the book with metal shielding plates 34 and 44 and magnetically isolating them,
It is also possible to reduce crosstalk noise between the connector signal pins.

As described above, a connector suitable for high speed signal transmission can be realized.

[0014]

As described above, according to the present invention, the reflection noise and the crosstalk noise on the signal transmission line are alleviated to shorten the signal transmission delay time and prevent the deterioration of the transmission signal waveform. A connector suitable for high-speed signal transmission can be realized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a connector according to an embodiment of the present invention.

FIG. 2 is a side view showing a coupling surface of a male connector and a female connector in FIG.

FIG. 3 is a sectional view showing a configuration of a conventional connector.

[Explanation of symbols]

 30 ... Male connector 40 ... Female connector 31, 41 ... Connector signal pins 32, 42 ... Insulator part 33, 43 ... Exterior 34, 44 ... Metal shielding plate M ... Motherboard D ... Daughter board

Claims (1)

[Claims] 1. A pair of connectors for electrically connecting printed wiring boards to each other, wherein a plurality of connector signal pins connected to wiring on the printed wiring board and the connector signal pins are entirely surrounded. A connector comprising: an insulator part to be fixed; and a metal shield plate that magnetically separates each connector signal pin in the insulator part for each combination of a plurality of connector signal pins for performing differential signal transmission.