JPH06215829A - High-speed transmission electric connector - Google Patents

Abstract

PURPOSE:To provide a high-speed transmission electric connector capable of shielding and impedance-matching and capable of employing an open pin field type connector on the mother board side. CONSTITUTION:A pair of a signal terminal 30 and a ground terminal 50 form a pseudo coplanar type line structure at coupling sections 33, 53 and fixed sections 31, 51 and form a micro-strip line structure at lead sections 34, 54. In a pair of the signal terminal 30 and the ground terminal 50, the fixed sections 31, 51 and the lead sections 34, 54 are formed in a nearly planar shape, and the width of the lead section 34 of the signal terminal 30 and the distance to the lead section 54 of the ground terminal 50 are set to the impedance matching relation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high speed transmission electrical connector used for connecting a mother board and a daughter card.

[0002]

2. Description of the Related Art In computers and communication devices, transmission signals are becoming faster and higher in frequency, and board mounting tends to be higher in density. Therefore, high-speed transmission connectors for connecting boards and units are not available. The number of terminals is becoming very large.

In such a connector, it is necessary to shield the contacts. For example, US Pat. No. 4,9
2. Description of the Related Art As disclosed in Japanese Patent No. 52,172, there is conventionally known one provided with a grounding terminal which is connected to each other when both housings to be fitted are fitted to each other. In this known connector, blade-like ground terminals are provided between adjacent contact rows in both housings in which a large number of contacts are arranged in rows and columns. When the housings are fitted together, the ground terminals in both housings make a pair and elastically contact each other. A terminal portion is extendedly formed on the pair of ground terminals, and the terminal portion is grounded to the board when the connector is mounted on the board.

In order to connect such a connector to the mother board side, a ground terminal having a different form from that of the signal terminal is also prepared corresponding to the connector on the mother board side.

On the other hand, as the connector, a connector in which a signal terminal and a ground terminal are not distinguished and pins of the same form are implanted as terminals are widely used. This connector is known as an open pin field type, and in use, a pin around a pin used as a signal terminal is connected as a ground terminal.

[0006]

However, in the connector having the blade-shaped ground terminal described above, the signal terminal is shielded by the ground terminal, but the ground terminal has a special blade shape. The other party also requires a blade-shaped ground terminal. Therefore, it is necessary for this connector to have corresponding terminals on the mating motherboard side as well, and for the type that has common post terminals (pins) without distinction between signal terminals and ground terminals. Not applicable. Further, even if each column is shielded, no shield is provided between two adjacent signal terminals in one column, so the shield cannot be said to be perfect.

On the other hand, in the so-called open pin field type, the post pins of each row and column have a common form and can be used as both a signal terminal and a ground terminal. However, when one pin is selected as a signal terminal and is shielded, the pins around this pin must be ground terminals, which causes a problem that the density of the connector cannot be increased.

The present invention solves the problems of the above-described conventional connector, and allows an open pin field type connector to be adopted as the counterpart, and the signal terminal can be adopted regardless of which pin is adopted as the signal terminal. It is an object of the present invention to provide a high-speed transmission electrical connector which is almost completely shielded.

[0009]

SUMMARY OF THE INVENTION According to the present invention, the above object is to provide a connector for a daughter card, which is connected to a connector for a mother board having a post terminal, in which a signal terminal and a ground which are paired closely to the insulating housing are grounded. A plurality of pairs of terminals are implanted to form rows and columns, and the pair of signal terminals and ground terminals are both fixed to the fitting portion connected to the post terminals and for fixing themselves in the housing. Part inside the housing, the lead part and the contact part on the card side outside the housing, and the signal terminal and the ground terminal of the pair have a pseudo coplanar line structure at the fitting part and the fixing part.
The lead portions are formed so as to form a microstrip line structure with each other, and the pair of signal terminals and ground terminals have a fixed portion and a lead portion formed in a substantially flat plate shape, and the width of the lead portion of the signal terminal and the grounding. This is achieved by setting the distance between the lead portion of the terminal and the impedance matching.

[0010]

In the connector of the present invention having such a structure, any signal terminal can be connected to the post pin of the connector on the motherboard side. The signal terminal receives the mating post pin in its fitting portion and is electrically connected. On the other hand, the ground terminal also receives the post pin selected as the ground terminal and is connected to the fitting portion.

The signal terminal and the ground terminal have a pseudo-coplanar line structure at the fitting part and the fixing part, and a microstrip line structure at the lead part. A match is made.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a vertical sectional view of the connector of this embodiment. It should be noted that FIG. 1 is a cross section mainly at the position of the signal terminal and a part of the upper part at the position of the ground terminal. Further, FIG. 2 shows the AA cross section and the BB cross section in FIG. 1 at the same time. In the figure, the upper left portion B is a BB cross section,
The other part A is an AA cross section.

In the figure, 10 is an insulating housing for the connector. The housing 10 has a signal terminal 30
Retaining holes 11 for holding holes and holding holes 12 for grounding terminals 50 are formed in pairs and in rows and columns at staggered positions.

The signal terminal 30 and the ground terminal 50 are formed in parallel with each other by punching out a metal plate and bending a part thereof.

The signal terminal 30 has a U-shaped cross section and is fixed in position in the holding hole 11 of the housing.
And a fitting portion 33 formed as an elastic contact piece having a throat portion 32 for receiving the post pin P on the mother board provided in the front thereof, and a fitting portion 33 extending rearward from the fixing portion 31 and extending in the plane L thereof. Lead part 3 that changes the direction to a letter
4 and a contactor portion 35 provided at the lower end thereof for connection with the card side. The lead portion 34 is formed with a step in the same direction with respect to the fixed portion 31 by an amount corresponding to the position shift of the holding holes 11 and 12 in the height direction (see FIG. 3).

As shown in FIG. 1, in this embodiment, each column is provided with three signal terminals 30, 30A and 30B, and only the lead portion has different dimensions, but the other portions are all different. It is the same. As can be seen from FIG. 1, the lead portion is changed to the L-shaped direction, so that the signal terminal 3
It is formed in the order of 0, 30A and 30B.

The ground terminal 50 has a basic shape similar to that of the signal terminal described above. The ground terminal 50 has a fixing portion 51 and a lead portion 54 at positions corresponding to the fixing portion 31 and the lead portion 34 of the signal terminal 30 in the fitting direction of the post pin P, respectively. The fixing portion 51 has upper and lower edges and is bent toward the side opposite to the fixing portion 31 of the signal terminal 30 so as to be “shaped”.
It has a V-shaped cross section. Fitting portions 53 formed as elastic contact pieces having a throat portion 52 are extendedly formed on the upper and lower edges of the fixing portion 51. A shield plate portion 56 is formed so as to extend forward from the plane portion of the fixed portion on the same plane. The shield plate portion 56 is provided at the corresponding position to the fitting portion 33 of the signal terminal. A front end bent portion 57 is formed at the front end of the shield portion 56 for the purpose of crosstalk between the post pins in the vertical direction and impedance matching.

A bent portion 58 is formed at one edge of the lead portion 54 of the ground terminal 50 so as to cover one edge of the lead portion 34 of the signal terminal 30 at the corresponding position. . A contact portion 55 extends from the lower end of the lead portion 54 of the ground terminal 50 for connection with the card side.

As shown in FIG. 1, as in the case of the above-mentioned signal terminals 30, 30A, 30B, in the present embodiment, the ground terminals are also three ground terminals 50, 50A, 5 in each column.
0B is provided, and the lead portions are sequentially formed shorter. In addition, the ground terminal 50B, which is the lowest in FIG.
The bent portion is formed not only on the upper edge of the lead portion but also on the lower edge thereof. Thus, in the same column, three types of signal terminals and ground terminals, which are different in size in the lead portion, are installed, but in the same row, exactly the same pairs are arranged. There is.

The pair of the signal terminal 30 and the ground terminal 50 (further, 30A and 50A, 30B and 50).
As shown in FIG. 1, B (the same applies hereinafter) are inserted into the holding holes 11 and 12 of the insulating housing 10 from the rear side, and are fixed at predetermined positions by their fixing portions 31 and 51. The signal terminal 30 and the ground terminal 50, which are fixed at the predetermined positions as described above, are provided on the mother board side through which the fitting portions 33 and 53 are inserted from the insertion holes 13 and 14 opened at the tips of the holding holes 11 and 12, respectively. Prepare to receive the post pin P.

On the other hand, the contact portions 35 and 55 at the lower ends of the lead portions 34 and 54 outside the insulating housing 10 are held by the holding plate 6.
It is positioned by 0 and held through, preparing for connection with the daughter side.

In the connector of this embodiment as described above, in the signal terminal 30, the fitting portion 33 is the shield plate portion 56 of the ground terminal 50, and the fixing portion 31 corresponds to the fixing portion 51.
Thus, the lead portion 34 is shielded by the corresponding lead portion 54 and bent portion 58, respectively. Moreover, since the ground terminal 50 at the lowest position has a bent portion at the lower edge of the lead portion, when the signal terminals 30, 30A, 30B and the ground terminals 50, 50A, 50B are arranged in rows and columns, No matter which signal terminal is taken, it is surrounded by the ground terminal and reliably shielded.

In the above-mentioned shield structure, the signal terminal 30 and the ground terminal 50 forming a pair are connected at the fitting portion and the fixing portion.
Although there are some gaps between them, they come to exist in almost the same plane and form a so-called quasi-coplanar line structure, and the lead portions are parallel to each other and have substantially the same shape, and form a strip line structure. In addition to perfecting the shield, impedance matching is possible.

Further, regardless of which pin is selected as a signal terminal on the motherboard side of the conventional open pin field type, corresponding to that signal terminal, the above shield is perfected and impedance is matched. Is done.

[0026]

As described above, according to the present invention, the mating portion and the fixing portion have a pseudo-coplanar line structure, and the lead portion has a microstrip line structure as an impedance when the signal terminal and the ground terminal are mated. By providing a structure in which the signal terminal and the ground terminal are arranged close to each other in a distance relationship in which is matched, high-speed transmission in a wide band is possible.

Further, since the lead portion of the ground terminal is wider than the signal terminal to reduce the self-inductance, it is possible to suppress the ground noise due to the simultaneous operation.

Further, in order to match the impedance of the signal post portion and suppress the crosstalk between the signal rows, if a shield portion is provided at the tip of the ground terminal, the mating connector is connected to the signal terminal and the ground terminal. The same post pin can be selected, and high-speed compatibility is possible, allowing high-speed and general-purpose connectors to be mixed.

[Brief description of drawings]

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

2 is a sectional view of the connector of FIG. 1 taken along the lines AA and BB.

3 is a perspective view of a signal terminal and a ground terminal of the connector of FIG.

[Explanation of symbols]

 10 Insulation Housing 30 Signal Terminal 31 Fixing Part 33 Fitting Part 34 Lead Part 35 Contact Part 50 Grounding Terminal 51 Fixing Part 53 Fitting Part 54 Lead Part 55 Contact Part 58 Bending Part

Claims (3)

[Claims] 1. A connector on the daughter card side connected to a connector on the motherboard side having a post terminal, wherein a plurality of pairs of signal terminals and ground terminals which are paired closely to the insulating housing form rows and columns. Both the signal terminal and the ground terminal, which are provided in the housing, have a fitting portion connected to the post terminal and a fixing portion for fixing itself in the housing, and the lead portion and the card side contact. The child portion is provided outside the housing, and the pair of the signal terminal and the ground terminal are formed so that the fitting portion and the fixing portion form a pseudo-coplanar line structure, and the lead portion forms a microstrip line structure. In addition, the fixed portion and the lead portion of the paired signal terminal and ground terminal are formed into a substantially flat plate shape, and the width between the lead portion of the signal terminal and the lead portion of the ground terminal is the impedance. Speed transmission electrical connector, characterized in that it is set in a relationship is engaged. 2. The high-speed transmission electrical connector according to claim 1, wherein the ground terminal has a shield plate portion at a position corresponding to the fitting portion of the signal terminal. 3. The high-speed transmission electrical connector according to claim 1, wherein at least one edge of the lead portion of the ground terminal has a bent portion that covers the edge of the lead portion of the signal terminal.