JP2811541B2 - connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector having a mounting structure in which a circuit drawn from a printed circuit board is turned in a 90.degree. Direction.

[0002]

2. Description of the Related Art With the recent trend toward higher performance and miniaturization of electronic devices, connectors are required to be mounted on a substrate with high density and high accuracy. For this reason, connectors have been developed to have higher densities and multi-cores.

When the density and the number of cores are increased in a limited mounting space, the interval between terminals of the connector becomes narrow. For example, a connector for mounting on a printed circuit board has a configuration in which a large number of leads are arranged on the printed circuit board.To mount these leads accurately, it is necessary to align the printed circuit board mounting sections with high precision. Therefore, a terminal alignment plate is used.

[0004] In the case of a connector having a shape such that the lead-out of a circuit from a printed circuit board is converted by 90 °, a 90 ° converter between a mounting portion to the printed circuit board and a contact portion is made of a metal member. The exposed terminal part is bare.

[0005] When the density of such a connector is increased, the metal members constituting the terminal portion of the connector become thinner and thinner, and the strength of the single member is reduced. As a result, the terminals are likely to be deformed in the 90 ° converter, which may cause a reduction in withstand voltage or a short circuit due to contact between the terminals.

Further, in this type of electronic device, high-speed signal transmission is handled, so that a connector is required to have high-performance transmission characteristics over a wide band. And even in a multi-core high-density connector in which a large number of metal members of the same shape are arranged, the high-frequency characteristics are at a level that can satisfy the high-frequency characteristics up to a certain extent, so they are often used for such high-speed signal transmission. Have been.

However, in order to cope with the recent increase in the transmission capacity of electronic devices, it is necessary to further improve the high-speed transmission characteristics. High-density connectors have limited high-frequency characteristics.

In this case, if the connector structure is a coaxial type, good transmission characteristics can be exhibited in a required band. However, in this structure, the total number of component parts of the connector increases, and therefore, the cost may increase in some cases.

Therefore, there is a demand for a multi-core high-density connector which has higher performance than a connector of a simple-shaped metal member and is more expensive than a coaxial connector.

[0010] In response to the above requirements,
A structure called a pseudo coaxial connector has been proposed.
An example of this is shown in the longitudinal sectional view of FIG. 3 and the sectional view of FIG. Referring to FIG. 3, this conventional example is a connector having a direction changing portion for converting a lead of a circuit from a printed circuit board P by 90.degree. The terminal portion 47 made of a metal member is exposed at a 90 ° conversion portion between the connector housing 44 having the portion 46 and the connector housing 44. In FIG. 4, which is a cross-sectional view cut perpendicularly to the direction in which the direction change portion extends, a ground contact made of an L-shaped metal plate is formed around the signal contact 41 constituting the transmission line in the terminal portion 47. A structure is adopted in which the area is surrounded by 42 and shielded.

[0011]

As described above, in a connector having a shape in which the drawing of a circuit from a printed circuit board is turned by 90 °, a metal member is provided between the mounting portion to the printed circuit board and the contact portion. In many cases, the terminals are exposed, so that when the density is increased, the metal member to be formed becomes thinner and thinner and the strength of the member alone is reduced. As a result, there is also a problem that a voltage drop, a short circuit, or the like is likely to occur due to the deformation of the terminal in the 90 ° direction conversion unit.

In the above pseudo coaxial connector, 9
The signal contact and the ground contact in the 0 ° conversion part are exposed, and therefore, the insulation in this part is performed by air. For this reason, if the distance between the terminals is increased in consideration of the withstand voltage between the terminals, the capacitance of the transmission path space decreases and the characteristic impedance increases. The signal contacts are held by a connector housing for accommodating the contact portions and a terminal alignment plate which is a portion to be attached to a printed circuit board. For this reason, the terminals of the connector may be deformed during handling when the connector is mounted on a printed circuit board, and as a result, the characteristic impedance may change.

An object of the present invention is to provide a connector having a structure capable of maintaining the position of a signal contact in a transmission line of the connector at a constant position, stabilizing characteristic impedance, preventing short-circuit between terminals, and the like. That is.

[0014]

According to the present invention, there is provided a connector having a pseudo-coaxial structure in which a signal contact is surrounded by a ground contact, wherein the signal contact and the ground contact are respectively:
Insertion / extraction of one end implanted on the printed circuit board, the other end held by the connector housing, connected to the mating connector, and the other end connected between the other end and the other end of the printed circuit board in the embedding direction on the printed circuit board. In a connector provided with a direction change portion that bends in the direction, between the direction change portion of the signal contact and the direction change portion of the ground contact, an insulating material is disposed, and the insulating material is A connector is provided, which is a member having a tubular shape and is attached to the direction changing portion of the signal contact.

[0015] The ground contact may have an L-shaped cross section so as to surround the signal contact in cooperation with the adjacent ground contact.

[0016]

According to the above arrangement, the positional relationship between the signal contact and the ground contact is maintained and accurately determined. As a result, a stable and necessary and sufficient impedance characteristic can be provided, and a short circuit between the signal contact and the ground contact hardly occurs.

Further, by disposing the insulating material, it is possible to reduce the characteristic impedance in the direction changing section which has conventionally been high impedance. For this reason, it becomes easier to match the impedance system of the electronic device equipped with this connector structure. By adjusting the characteristic impedance of the space in the transmission line in this way, stable high-frequency characteristics can be obtained, and insertion loss and crosstalk characteristics can be improved to obtain good high-speed transmission characteristics.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A connector according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a connector according to the present embodiment. 1, the connector according to the present embodiment extends from the right side in the drawing of the connector housing 4, a large number of contact portions 6 accommodated in the connector housing 4, and the connector housing 4 as in the conventional example. It has a large number of signal contacts 1 and ground contacts 2.

The connector housing 4 is made of an insulating material made of plastic resin or the like.
It is integrally molded in. The illustrated example of the contact portion 6 has a socket contact shape. Then, it comes into contact with the corresponding pin contact of the mating connector inserted through the through hole 4a formed on the left side in the drawing of the connector housing 4.

The right side of the contact portion 6 in FIG. 1 is the signal contact 1. The portion protruding outside the connector housing 4 is bent approximately 45 ° clockwise. In the vicinity of the contact portion with the printed circuit board P, it is further bent approximately 45 ° clockwise. Thus, the contact portion 6 is bent by about 90 ° and is connected to the signal line of the printed circuit board P as the signal contact 1 via the terminal alignment plate 3. In other words, the signal contact 1 is connected to one end implanted on the printed circuit board P and the connector housing 4.
Between the other end connected to the mating connector and the other end connected to the mating connector. It can be said that.

The ground contact 2 has an L-shaped cross section as shown in FIG. The portion corresponding to the left side of the ground contact 2 in FIG. 1 is fixed in the connector housing 4 by resin insert molding or the like. 1 is bent twice by about 45 ° like the signal contact 1 (contact portion 6), and is connected to the ground line of the printed circuit board P via the terminal alignment plate 3. ing. That is, the ground contact 2 is also held between the one end implanted on the printed circuit board P and the connector housing 4 and the other end connected to the mating connector. It can be said that it has a direction changing portion that bends in the insertion / extraction direction in which the mating connector is inserted / extracted. As shown in FIG. 2A, each signal contact 1 is surrounded by the ground contact 2.

The 90 ° direction conversion portion between the terminal arrangement plate 3 and the connector housing 4 between the signal contact 1 and the ground contact 2 has an insulating material made of plastic resin or the like. 5 are arranged. By changing the type and amount of the resin of the insulating material 5, the characteristic impedance in the section of the direction changing unit can be appropriately adjusted.

The insulating material 5 is a member having a rectangular cross section manufactured in advance by plastic molding. As shown in FIG. 2B, the insulating material 5 may be replaced by an insulating material 5 'which is a cylindrical member. In any case, the cylindrical insulating member is formed by a stamping press in which the forming method of the signal contact 1 and the ground contact 2 is a simple stamping press and then a jig and tool.
て い る Suitable in the case where a direction conversion unit is formed.
In this case, the insulating material 5 or the insulating material 5 ′ is connected to the signal contact 1.
After being mounted between the signal contact 1 and the ground contact 2 so as to pass through, the legs are bent by a jig to form a 90 ° direction conversion portion.

[0024]

In the connector according to the present invention, since the insulating material is provided between the direction change portion of the signal contact and the direction change portion of the ground contact, the positional relationship between the signal contact and the ground contact is provided. Is determined exactly. Therefore, the characteristic impedance of the transmission line can be stabilized, and the characteristic impedance can be lowered to match the impedance system of the electronic circuit.

[Brief description of the drawings]

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

2 (a) and 2 (b) are cross-sectional views showing a direction changing portion of the connector shown in FIG.

FIG. 3 is a longitudinal sectional view showing a connector according to a conventional example.

FIG. 4 is a cross-sectional view showing a direction changing portion of the connector shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal contact 2 Ground contact 3 Terminal alignment board 4 Connector housing 5, 5 'Insulation material 6 Contact part P Printed circuit board

Claims (2)

(57) [Claims] 1. A connector encircled pseudo coaxial structure around the signal contact with ground contact, the signal contacts and each said ground contact, one end is implanted in the print substrate, The other end is connected to the mating connector while being held by the connector housing, and has a direction changing portion that is bent between the one end and the other end in the inserting / extracting direction in which the mating connector is inserted / extracted from the installation direction on the printed circuit board. In the connector, between the direction change portion of the signal contact and the direction change portion of the ground contact, an insulating material is disposed, the insulating material is a member having a tubular shape, A connector which is mounted on the direction changing portion of a signal contact. 2. The ground contact according to claim 1, wherein the ground contact has an L-shaped cross section so as to surround a periphery of the signal contact in cooperation with an adjacent ground contact. Connectors.