JPH06236788A - Socket - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a socket capable of increasing the density of high-speed transmission signals and improving the crosstalk characteristics. [Structure] The ground contact 1 includes a contact portion 10 that contacts a ground pin (not shown) of a PGA type module.
And a shield plate 11 including a holding portion 11a held by an insulating housing (not shown), and a terminal portion 12 for electrically connecting the shield plate 11 and a ground wire (not shown). The shield plate 11 has a substantially rectangular tubular shape in which one side face where the contact portion 10 is present and both end faces perpendicular to the extending direction of the ground contact 1 are cut out, and an insulating housing is interposed inside the shield plate 11. Signal contact 2 is 1: 1
It is arranged so as to be non-contact and electromagnetically shielded. The matching of the characteristic impedance of the socket with the PGA type module is performed by forming an air layer in the insulating housing as needed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin grid array (hereinafter referred to as PGA) type module such as LSI (Large Scale Integrated Circuit) or MCM (Multi Chip Module) and a wiring member. More specifically, the present invention relates to a socket that serves as a high-speed signal transmission medium, and more particularly to a socket provided with a plurality of contacts including a ground contact.

[0002]

2. Description of the Related Art Conventionally, this type of socket has been shown in FIG.
FIG. 1A shows a front view of the example, and FIG. 1B shows a side view thereof. Also, FIG. 8 is shown in FIG.
FIG. 9 is a cross-sectional view taken along line AA ′ of FIG.
FIG. 10 is a sectional view taken along line -B ', and FIG.
The cross-sectional views in each direction are shown.

This socket 70 has an insulating housing 7
2, a plurality of contacts 71 for achieving electrical continuity between a PGA type module (not shown) and a wiring member such as a printed circuit board are arranged and fixed in a frame shape at a predetermined pitch. Each contact 71 includes a contact portion 71a that comes into contact with a pin of the PGA module to be inserted and removed, a holding portion 71b that is held by the insulating housing 72, and a terminal portion 71c that is connected to a printed circuit board or the like. Incidentally, the holding unit 71
b is a rectangular thin plate integrally formed with the contact portion 71a and the terminal portion 71c.

In the socket 70 having such a structure, all the contacts 71 have the same structure so that the arrangement pitch of the contacts 71 is the same as the pin pitch of the PGA type module. The uses of each contact 71 are roughly classified into a ground contact 71 _G and a signal contact 71 _S , as shown in FIGS.

[0005]

When the socket described above is used for high-speed transmission of high-frequency signals such as clocks, electromagnetic interference between signals is shielded in order to avoid the influence of crosstalk. It must be called electromagnetic shielding). Therefore, when used, as described above, one contact is used as the signal contact 71 _S , and the surrounding contacts are connected to the ground line as the ground contact 71 _G (see FIG. 9). However, when a large number of contacts are used for ground as described above, there is a problem that the density of transmission signals does not increase as a basic performance.

Further, in the case of the conventional socket, the contacts 71 have a mutual distance (that is, a distance between the signal contact 71 _S and the ground contact 71 _G ) near the contact portion 71a as shown in FIG. Although the impedance is long and the impedance is increased accordingly, the mutual distance (that is, the distance between the signal contact 71 _S and the ground contact 71 _G ) becomes close to each other in the vicinity of the holding portion 71b as shown in FIG. , And accordingly, the impedance becomes low. Therefore, when the signal contact 71 _S is grounded by the ground contact 71 _G, it is difficult to match the characteristic impedance between the signal contact 71 _S and the PGA type module, and the electromagnetic reflection amount increases as the operating frequency increases. There is a problem that the signal is likely to be attenuated.

The present invention has been made to solve the above problems, and its technical problem is to provide a socket capable of increasing the density of high-speed transmission signals and improving the crosstalk characteristics.

[0008]

According to the present invention, a plurality of signal contacts used for signal transmission, at least one ground contact connected to a ground line, and an insulative housing holding these are provided. In the socket including the PGA type module and the wiring member, the ground contact includes a contact portion that comes into contact with the ground pin of the module, and a holding portion that is coupled from the contact portion and is held by the insulating housing. The shield plate includes a shield plate and a terminal part that is connected to the holding part and is connected to the ground line. The shield plate is a conductive member that surrounds the signal contact in a non-contact manner and electromagnetically shields other signal contacts. A socket consisting of

[0009]

The contact portion of the ground contact contacts the ground pin of the inserted PGA type module. As a result,
The ground pin is electrically connected to the ground wire via the holding portion and the terminal portion. As a result, the shield plate becomes the ground potential,
The ground pin also has the same potential. The signal contacts surrounded by the shield plate are electromagnetically shielded from other signal contacts.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The socket of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1A is a perspective view showing the appearance of a ground contact provided in a socket according to an embodiment of the present invention, and FIG. 1B is a perspective view showing the appearance of a signal contact provided in the socket. It is a thing.

The ground contact 1 is integrally made of a conductive material, and guides the insertion / extraction of a ground pin (not shown) of the PGA type module, and a contact portion 10 that comes into contact therewith. As shown in FIGS. 2 and 3, the shield plate 11 including the holding portion 11a held by the insulating housing 30 and the shield plate 11 are integrally combined,
It is composed of a terminal portion 12 which is electrically connected to a ground wire (not shown). As shown in the figure, the shield plate 11 has a substantially rectangular tubular shape in which one side face where the contact portion 10 is present and both end faces perpendicular to the extending direction of the ground contact 1 are cut out. Contacts 2 are arranged in a non-contact manner. Reference numeral 11b shown in the drawing is a ground plate that faces the contact portion 10 in the shield plate 11.

On the other hand, the signal contact 2 is integrally made of a conductive member, and guides the insertion / removal of the signal pin (not shown) of the PGA type module, and the contact portion 20 that comes into contact therewith. The holding portion 21 is held by the insulating housing 30, and the terminal portion 22 is provided to establish electrical continuity between the holding portion 21 and an external signal line or a power supply terminal (not shown). The signal contact 2 has the same structure as the conventional product, and the holding portion 21 thereof has a rectangular plate shape as shown in the drawing.

2A and 2B show the structure of a main part of a socket according to an embodiment of the present invention. FIG. 2A is a side view of the socket, and FIG. 2B is a front view of the socket. It is shown by the figure.

Also in this socket, the plurality of signal contacts 2 used for signal transmission and the plurality of ground contacts 1 connected to the ground line have the insulating housing 3.
It is held at 0.

FIG. 3 is a sectional view of the socket A- shown in FIG.
It is a sectional view in the A'direction. Here, the positional relationship between one signal contact 2 assigned for high-speed signals and the ground contact 1 corresponding to this signal contact 2 is shown.

Further, FIG. 4 shows the BB of the socket shown in FIG.
Fig. 5 shows a sectional view of the socket in the direction '
FIG. 6 shows a sectional view in the -C 'direction, and FIG. 6 shows a sectional view in the DD' direction of the socket. In each of these figures, changes in the cross-sectional shapes of the ground contact 1 and the signal contact 2 are shown.

FIG. 4 shows a correspondence relationship between the contact portion 10 and the shield plate 11 of the contact 1 and the contact portion 20 of the contact 2. The contact portion 10 of the ground contact 1 is in a state of being rotated with respect to the contact portion 20 of the signal contact 2 about the axis by a predetermined angle (for example, 90 degrees).

Here, the signal contact 2 is surrounded by the shield plate 11, and an insulating housing 3 is provided between the two.
It has a structure in which 0 is interposed. That is, the contact portion 10 of the ground contact 1 and the end portion of the shield plate 11 are separated, and the signal contact 2 is surrounded by the three sides of the shield plate 11 with the insulating housing 30 interposed therebetween. or,
The signal contacts 2 are assigned to high-speed signals and power supplies or low-speed signals, and the high-speed signals are surrounded by the shield plate 11 of the ground contacts 1 in a 1: 1 correspondence to be mixed with low-frequency signals.

Further, the air layer 31a formed between the shield plate 11 and the insulative housing 30 is formed by cutting out a part of the insulative housing 30, and its shape is determined as necessary. Although it is good, it is usually desirable to provide it adjacent to the shield plate 11 as shown.

FIG. 5 shows the shield plate 11 of the contact 1.
The corresponding relationship between the holding portion 11a and the contact portion 20 of the contact 2 is shown. In this part, the holding portion 11a
Surrounds the contact portion 20 of the signal contact 2 to form a closed region, and the insulating housing 30 is interposed therebetween.

FIG. 6 shows the shield plate 11 of the contact 1.
And the holding portion 21 of the contact 2 are shown. In this portion, the portion of the shield plate 11 facing the holding portion 11a is cut out to form an air layer 31c.
The width and the axial length of the air layer 31c are arbitrarily determined. Here again, the insulating housing 30 is interposed between the shield plate 11 and the holding portion 21 of the contact 2, but another air layer 31b is formed in the portion adjacent to the shield plate 11.

In the socket having such a structure, the signal contact 2 used for high-speed signal transmission is electromagnetically shielded by the shield plate 11 of the ground contact 1 when used, so that the signal contact 2 is separated from other signal contacts 2. The crosstalk at is moderately suppressed. Further, since the signal contact 2 and the ground contact 1 correspond to each other 1: 1, the transmission signal density is remarkably increased as compared with the conventional case. Further, since the air layers 31a to 31c can be formed as needed to match the characteristic impedance with the impedance of the PGA type module, for example, the socket can have a structure close to a coaxial cable. In this case, attenuation of the signal level due to reflection can be suppressed by adjusting the axial length and width of each air layer.

The socket according to the embodiment has a structure applicable to high-frequency signals, and conventional contacts are used for signal contacts for low-frequency signal transmission or power supply, but the contact arrangement and structure are used. Can be rearranged according to the application.

[0024]

As described above, in the socket of the present invention, the shield plate including the holding portion for the ground contact is made of a conductive member, and the signal contact is surrounded by this shield plate in a non-contact manner to shield the electromagnetic shield. This structure has the effect of significantly reducing the influence of crosstalk due to other signal contacts. Thereby, it is possible to accurately transmit the high frequency signal between the PGA type module and the wiring member. In particular, since the socket for the signal contact and the ground contact correspond to each other 1: 1, in this case, as compared with the conventional structure in which one signal contact is surrounded by a plurality of ground contacts. The signal transmission density is increased, and the socket and the PGA type module can be downsized.

Further, since the contact portion of the ground contact is in a state in which the direction around the axis is rotated by a predetermined angle with respect to the contact portion of the signal contact, these contacts are set to P.
When the connection is made between the ground pin and the signal pin in the GA type module, the effect of electromagnetic shielding is further enhanced.

Further, an arbitrary air layer is interposed in the housing, which is a fixed part of each contact, so that the characteristic impedance can be easily matched. This allows
The socket can have a structure similar to a coaxial cable in which the arrangement of the air layer can suppress the attenuation of the signal level due to reflection.

In addition, although the socket of the present invention is basically applied to high frequency signals, conventional contacts can be used as they are as signal contacts for low frequency signal transmission or power supply. Therefore, the arrangement and structure of the contacts can be rearranged according to the application, so that it is possible to provide a highly versatile socket.

[Brief description of drawings]

FIG. 1A is a perspective view showing the appearance of a ground contact provided in a socket according to an embodiment of the present invention, and FIG. 1B shows the appearance of a signal contact provided in the socket. It is a perspective view.

FIG. 2 (a) is a side view showing a main part structure of a socket according to an embodiment of the present invention, and FIG. 2 (b) is a front view of the socket.

FIG. 3 is a sectional view of the socket shown in FIG. 2 (b) taken along the line AA ′.

FIG. 4 is a cross-sectional view of the socket shown in FIG. 3 in the BB ′ direction.

5 is a cross-sectional view of the socket shown in FIG. 3 taken along the line CC ′.

6 is a cross-sectional view of the socket shown in FIG. 3 in the DD ′ direction.

FIG. 7 (a) is a front view showing a main structure of a conventional socket, and FIG. 7 (b) is a side view of the socket.

FIG. 8 is a cross-sectional view of the socket shown in FIG. 7A, taken along the line AA ′.

9 is a sectional view of the socket shown in FIG. 8 taken along the line BB ′.

10 is a cross-sectional view of the socket shown in FIG. 8 taken along the line CC ′.

[Explanation of symbols]

1,71 _G Ground contact 2,71 _S Signal contact 10,20 Contact part 11 Shield plate (conductive member) 11a, 21, 71b Holding part 12, 22, 71c Terminal part 30,72 Insulating housing 31a-31c Air layer 70 Socket 71 contact

Front Page Continuation (72) Inventor Shinichi Sasaki 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (5)

[Claims] 1. A pin grid array type module including a plurality of signal contacts used for signal transmission, at least one ground contact connected to a ground line, and an insulating housing holding these contacts. In a socket connected to a wiring member, the ground contact includes a contact portion that comes into contact with a ground pin of the module, and a shield plate that is connected from the contact portion and is held by the insulating housing. And a terminal portion coupled to the holding portion and connected to the ground line,
The socket is characterized in that the shield plate is made of a conductive member that surrounds the signal contact in a non-contact manner to electromagnetically shield other signal contacts. 2. The socket according to claim 1, wherein the shield plate is formed in a substantially rectangular tube shape by cutting out one side surface where the contact portion is present and both end surfaces perpendicular to the extending direction of the ground contact. A socket that has been characterized. 3. The socket according to claim 2, wherein the contact portion of the ground contact is provided by rotating the contact portion of the signal contact about the axis by a predetermined angle. A socket to do. 4. The socket according to claim 2, wherein the insulating housing is interposed between the shield plate and the signal contact. 5. The socket according to claim 4, wherein a partial air layer is formed between the housing and the shield plate.