JPH11329600A - Electrical connector having a ground terminal - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide an electrical connector having a ground terminal capable of miniaturizing a connector and enabling high-speed signal transmission. A receiving part for receiving a mating connector or a circuit board is formed in a housing made of an insulating material, and a ground terminal and a plurality of signal terminals held by the housing face a ground contact part facing the receiving part. 8A
And a signal contact portion 7A on the front side to be connected to the mating connector or the circuit board D. The ground terminal 8 has a plate-shaped shield portion 8B. In an electrical connector in which the shield portion 8B extends on the back side of the signal terminal 7 over the range of the held portion 7B of the plurality of signal terminals 7 held, the shield portion 8B may be a held portion of the signal terminal 7. 7B
Is held or buried in the housing thickness 5 in close proximity to the housing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electrical connector having a shield terminal.

[0002]

2. Description of the Related Art As this kind of connector, for example, a connector disclosed in Japanese Patent Application Laid-Open No. Hei 8-306446 is known. In this known connector, a plurality of signal terminals and ground terminals are respectively implanted in a housing made of an insulating material, and contact portions of these terminals contact a circuit board inserted into a receiving portion of the housing. It is supposed to connect. In the disclosed example, the ground terminals are arranged alternately with the signal terminals or at a ratio of one to two signal terminals.

The ground terminal extends outside the housing and has a grounding portion along the outer wall surface of the housing. The ground terminals of the plurality of ground terminals are connected between the housing and a shield plate fitted on the outer wall surface of the housing. The portion is pinched and is in contact with the shield plate. Thus, the shield plate is connected to the ground circuit of the circuit board on which the connector is inserted, and shields the signal terminals from the outside.

[0004]

However, the above-mentioned known connectors have room for improvement in terms of downsizing of the connectors and high-speed signal transmission.

[0005] That is, since the outer wall of the housing is not necessarily united with the shield plate attached thereto, the outer wall itself must have strength.
It has to be relatively thick. In addition, since the shield plate is attached to the outside of the connector, the thickness of the connector is increased and the size of the connector is increased. In addition, in the contact portion between the shield plate and the grounding portion of the ground terminal, since both portions overlap, the portion swells. If there is such a part on the outer surface by the connector,
The dimensions limit the placement of surrounding components,
Eventually, the connector is the same as having a larger size in this dimension.

Furthermore, since the shield plate and the ground terminal are separate components, the number of components is increased, and it is not preferable in that electrical contacts can be made.

In addition, since the signal terminal is provided inside the outer wall of the housing and the shield plate is provided outside the housing, the distance between the two is relatively large, and a higher shielding property is obtained.
That is, high-speed transmission cannot be realized.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electrical connector having a ground terminal that can be reduced in size and capable of high-speed transmission.

[0009]

According to the electric connector of the present invention, a receiving portion for receiving a mating connector or a circuit board is formed in a housing made of an insulating material, and the ground terminal and a plurality of signal terminals held in the housing are formed as described above. A ground contact portion and a signal contact portion facing the receiving portion are respectively provided on the front side, and are connected to the mating connector or the circuit board. Further, the ground terminal has a plate-shaped shield portion, and the shield portion extends on the rear side of the signal terminal over a range of the held portions of the plurality of signal terminals held by the housing.

In this electrical connector, in the present invention, the shield portion is held or buried within the thickness of the housing near the held portion of the signal terminal.

According to the present invention, since the shield portion is located at the thick portion of the housing, it is close to the signal terminal, and furthermore, the shield portion and the ground contact portion are integrally formed, and a contact portion is provided between the two. Since it is not provided, the shielding performance and high-speed transmission performance are improved. In addition, since the minimum required thickness of the housing is secured and the shield does not come outside the housing, the size of the connector can be reduced.

In a preferred embodiment of the present invention, if the ground terminal has a cutout groove formed in the shield portion and a part of the housing enters into the cutout groove, the connection between the shield portion and the housing may be made. The degree, ie the holding power, increases.

The ground terminal may be configured such that the shield part is inserted and held in the holding groove of the housing, or may be formed so as to be buried integrally with the housing.

The ground terminals may be arranged such that ground contact portions are alternately arranged with groups of signal contact portions of one or more signal terminals. Also, the ground terminal may be such that the cut groove is located between the held portions of the signal terminals adjacent to each other in the arrangement direction of the signal terminals.

[0015]

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

FIG. 1 is a partial plan view of the electrical connector according to the present embodiment, FIG. 2 is an enlarged sectional view taken along the line AA in FIG. 1, FIG. 3 is an enlarged sectional view taken along the line BB in FIG. A-
FIG. 3 is a perspective view taken along line A. In addition, the plan view of FIG.
The upper left part is the CC line in FIG. 2, and the upper right part is FIG.
FIG. 3 is a plan view when a cross section is taken along the line DD in FIG. The figure shows a state in which the daughter board D is mounted on the electric connector 1 mounted on the motherboard M.

The housing 2 of the connector 1 has a width direction (FIG. 1).
2 and 3, a receiving portion 3 is formed at a central portion of the receiving portion 3 which extends in a longitudinal direction (a left-right direction in FIG. 1, and a direction perpendicular to the paper in FIGS. 2 and 3). The receiving portion 3 is formed as a concave portion for receiving the daughter board D, and opens upward (in FIG. 1, at right angles to the plane of FIG. 1, toward the front, and in FIGS. 2 and 3, upward).

The housing 2 made of an insulating material has terminal grooves formed on a surface extending in a direction perpendicular to the surface of the daughter board D inserted into the receiving portion 3 (a surface extending in the width direction and the vertical direction of the housing 2). 4 are formed at predetermined intervals in the longitudinal direction of the housing 2. The terminal groove 4 is
Like the receiving part 3, it is opened vertically and communicates with the receiving part 3 in the width direction of the housing 2 and forms a pair so as to face both sides of the receiving part 3.

Immediately behind the plurality of terminal grooves 4 (receiving portion 3)
A holding groove 6 extending in the longitudinal direction is formed in the side wall portion 5 of the housing 2 located on the side (opposite side) from the plurality of terminal grooves 4, and a ground terminal described later is held here. You.

As shown in FIGS. 2 and 4, the signal terminal 7 is formed by bending a metal strip in the thickness direction thereof, and a signal contact portion 7A that contacts a circuit portion of the daughter board D.
And a held portion 7B held by the terminal groove 4, and a leg-shaped connecting portion 7C protruding downward from the housing 2. The width of the signal terminal 7 (dimension in a direction perpendicular to the paper surface in the drawing) is substantially the same as the width of the terminal groove 4, and the side of the held portion 7B which is straight when inserted into the terminal groove 4 The edge or a part thereof engages with the inner surface of the terminal groove 4 and is held. The signal contact portion 7A is bent substantially in a C-shape and is elastically deformable at the front portion toward the daughter board D. It is designed to be pinched. The held portion 7 </ b> B has a straight shape in the present embodiment, and is in contact with the inner surface of the terminal groove 4. The connection portion 7C is
There are two types, one extending straight on the extension line of B and one being bent forward once and then bent downward again to form a crank shape.
These are alternately arranged within.

As shown in FIGS. 3 and 5, the ground terminal 8 has a substantially C-shaped elastically deformable ground contact portion 8A.
And a leg-shaped connecting portion 8C protruding downward from the housing 2.
Is similar to the signal terminal 7 described above. The difference is that the shield portion 8B at a position corresponding to the held portion 7B of the signal terminal 7 has a plate shape extending in the longitudinal direction of the housing 2, and a plurality of ground contact portions 8A and connection portions 8C as shown in FIG. It is to be united with. In the present embodiment, one ground contact portion 8A extending from the shield portion 8B exists for each group of three signal contact portions 7A, and the contact portions 8A are alternately located with the signal contact portions 7A of the signal terminals 7. It has become. The ground terminal 8 is formed such that the shield portion 8B has the holding groove 6 of the housing 2 described above.
The ground contact portion is held in the terminal groove 4 at a position where the ground contact portion contacts the daughter board D.

In the present embodiment, the ground terminal 8 is
A cut groove 8D to be opened is formed below the shield portion 8B. The cut groove 8D is preferably located between the adjacent signal terminals 7. In other words, the shield portion 8B is present at the signal terminal 7, especially at the position behind the held portion 7B. The cut groove 8D is provided for the adjacent signal terminal 7.
It is not necessary to be formed in all the positions in between, and it is sufficient if it is formed in some of those positions. The corresponding portion of the housing enters the cut groove 8D, and the holding force in the shield portion 8B is strengthened. When the ground terminal 8 is assembled into the housing, the connection portion 8C is on the same surface as the shield portion 8B, and is inserted into the holding groove 6 of the housing from above with only the ground contact portion 8A bent as shown in the drawing. Connection section 8C
After being protruded from below the housing, it is bent and shaped as shown in FIG.

The electrical connector 1 according to the present embodiment is arranged and fixed at a predetermined position on a circuit board, for example, a motherboard M, and has a connection portion 7C of the signal terminal 7 and a connection portion 8C of the ground terminal 8, respectively. Connected to the circuit section of the motherboard M to be connected.

Thereafter, the daughter board D is inserted into the receiving portion 3 of the connector 1. The signal circuit portion and the ground circuit portion formed on the surface of the daughter board D make elastic contact with the signal contact portion 7A of the signal terminal 7 and the ground contact portion 8A of the ground terminal 8, respectively. Thus, the circuit of the daughter board D includes the signal terminal 7 and the ground terminal 8.
, And is connected to the circuit of the motherboard M.

The shield portion 8B of the shield terminal 8 is located close to the back of the signal terminal 7. This is suitable for high-speed signal transmission. This is because the shield 8B is located within the thickness of the side wall 5 of the housing 2 so that it can be located very close to the held portion 7B of the signal terminal 7. Further, since the shield portion 8B does not exist outside the housing 2, the size of the connector is reduced accordingly. Furthermore, when the cut 8D is formed in the shield portion 8B, the housing 2
Are partly entered, and the holding at the shield portion 8B is strengthened. If the cut groove 8D is located between the adjacent signal terminals, the shielding function is not impaired.

The engagement relationship between the cut groove 8B and the housing 2 can be such that the shield terminal 8 is fitted so as to mesh with each other when the shield terminal 8 is inserted into the holding groove 6, even when the housing is formed. The resin may flow into the cut groove.

In the present embodiment, one shield terminal is provided for one row of signal terminals. However, the present invention is not limited to this, and it is possible to divide the signal terminals into a plurality. Further, the number of contact portions or connection portions of the ground terminals with respect to the number of signal terminals can be set as appropriate.

[0028]

As described above, according to the present invention, the shield portion of the shield terminal is accommodated within the thickness of the housing, so that the shield portion is located close to the signal terminal, and the ground is provided. The characteristics are improved, the high-speed signal transmission is improved, and the shield terminal does not exist outside the housing, so that the connector can be downsized.

[Brief description of the drawings]

FIG. 1 is a partial plan view of an electrical connector according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along the line AA in FIG.

FIG. 3 is an enlarged sectional view taken along line BB in FIG. 1;

FIG. 4 is a perspective view when sectioned along line AA of FIG. 1;

FIG. 5 is a perspective view of a ground terminal of the connector of FIG. 1, which is shown separately from a signal terminal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric connector 2 Housing 3 Receiving part 6 Holding groove 7 Signal terminal 7B Held part 8 Ground terminal 8B Shield part 8D Cut groove

Claims (5)

[Claims] A receiving portion for receiving a mating connector or a circuit board is formed in a housing made of an insulating material, and a ground terminal and a plurality of signal terminals held by the housing form a ground contact portion and a signal contact portion facing the receiving portion. The ground terminals each have a plate-shaped shield portion and are provided with a plurality of signal terminals held by the housing. In the electrical connector in which the shield portion extends on the back side of the signal terminal over the range of the holding portion, the shield portion is held or buried in the housing thickness close to the held portion of the signal terminal. An electrical connector having a ground terminal. 2. The electrical connector having a ground terminal according to claim 1, wherein a cut groove is formed in the shield portion of the ground terminal, and a part of the housing enters into the cut groove. 3. The electrical connector having a ground terminal according to claim 1, wherein the ground terminal has a shield part inserted and held in a holding groove of the housing. 4. The ground terminal according to claim 1, wherein the ground contacts are arranged so that the ground contacts alternate with a group of signal contacts of one or more signal terminals. An electrical connector having a ground terminal according to claim 1. 5. The electrical connector having a ground terminal according to claim 2, wherein the cutout groove of the ground terminal is located between the held portions of the signal terminals adjacent to each other in the arrangement direction of the signal terminals.