This application claims priority to prior Japanese patent application JP 2006-42231, the disclosure of which is incorporated herein by reference.
This invention relates to a connector comprising a signal contact for use in signal transmission and a ground contact connected to ground.
For example, an electrical connector of the type is disclosed in Japanese Patent (JP-B) No. 3564555 and Japanese Unexamined Patent Application Publication (JP-A) No. 2004-534358. The electrical connector is suitable for connection of lines transmitting high speed signals by a differential transmission method. In the transmission method, two signal lines (+, −) are used and “High” and “Low” of signals are discriminated by a potential difference between the two signal lines. Two signals transmitted through the two signal lines are equal in voltage level to each other and are different in phase from each other by 180°. In the transmission method, a noise produced in the two signal lines are canceled at an input stage of a receiver. Accordingly, a transmission accuracy is improved.
Referring to
The connector 21 comprises a plurality of signal contacts S, a plurality of ground contacts G, an insulating housing 22 holding the signal contacts S and the ground contacts G, and a shell covering the signal contacts S, the ground contacts G, and the housing 22. The shell 23 has a pair of spring portions 23a formed on its upper surface to be engaged with a mating connector.
The contacts S and G of the connector 21 has contacting portions C to be connected to respective contacts of the mating connector. The contacting portions C are arranged in two rows, i.e., upper and lower rows, as shown in
Referring to
The contacts S and G have terminal portions T to be soldered and connected to a substrate. As shown in a lower part in
However, as shown in
It is therefore an object of this invention to provide a connector in which crosstalk hardly occurs.
It is another object of this invention to provide a connector which is compact, low in cost, and excellent in high-frequency characteristic.
Other objects of the present invention will become clear as the description proceeds.
According to an aspect of the present invention, there is provided a connector adapted to be mounted to a substrate and to be connected to a mating object in a first direction, wherein the connector comprises a plurality of contacts arranged in a second direction intersecting the first direction and a housing holding the contacts, wherein each of the contacts comprises a contacting portion to be contacted with the mating object, a terminal portion to be connected to the substrate, and an intermediate portion between the contacting portion and the terminal portion, wherein the contacts include a plurality of paired signal contacts and a plurality of ground contacts wherein the contacting portions of the paired signal contacts and the ground contacts are arranged in two rows extending in the second direction and in a staggered fashion, wherein a combination of the paired signal contacts in one of the rows and the ground contact in the other row forms a first set, wherein a combination of the paired signal contacts in the other row and the ground contact in the one row forms a second set adjacent to the first set in the second direction, and wherein adjacent ones of the intermediate portions in the first and the second sets are shifted in position from each other in the first direction.
Referring to
The connector depicted at 1 in the figures is adapted to be connected to a mating connector (not shown) in a first direction D1. The connector 1 comprises a plurality of conductive signal contacts S, a plurality of conductive ground contacts G, an insulating housing 2 holding the signal contacts S and the ground contacts G, and a conductive shell 3 covering the signal contacts S, the ground contacts G, and the housing 2. The shell 3 has a pair of spring portions 3a formed on its upper surface. The spring portions 3a are brought into contact with a conductive shell of the mating connector when the connector 1 is connected to the mating connector. The signal contacts S and the ground contacts G are generally arranged in parallel in a second direction D2 perpendicular to the first direction D1.
The signal contacts S and the ground contacts G have contacting portions Sc and Gc to be contacted with mating contacts of the mating connector, holding portions Sp and Gp extending from the contacting portions Sc and Gc and held by the housing 2, intermediate portions Sm and Gm extending from the holding portions Sp and Gp and exposed out of the housing 2, and terminal portions St and Gt extending from the intermediate portions Sm and Gm and connected to a substrate by soldering, respectively.
The contacts S and G of the connector 1 are arranged so that, in a fitting portion 1a, the contacting portions Sc and Gc and the holding portions Sp and Gp are separately arranged in two rows, i.e., in upper and lower rows. In the upper row, the holding portions Sp and Gp are arranged in the order of Sp, Sp, Gp, . . . , in the second direction D2. In the lower row, the holding portions Sp and Gp are arranged in the order of Gp, Sp, Sp, . . . . The holding portions Sp of two adjacent ones of the signal contacts S in the upper row (hereinafter will be referred to as paired signal contacts in the upper row) and the holding portion Gp of one ground contact G in the lower row faced to the paired signal contacts S in a vertical direction are located at apexes of an isosceles triangle, respectively. Likewise, the holding portions Sp of two adjacent ones of the signal contacts S in the lower row (hereinafter will be referred to as paired signal contacts in the lower row) and the holding portion Gp of one ground contact G in the upper row faced to the paired signal contacts S are located at apexes of an isosceles triangle, respectively.
Referring to
A combination of the paired signal contacts S in the upper row and the ground contact G in the lower row forms a set A. Similarly, a combination of the paired signal contact S in the lower row and the ground contact G in the upper row forms a set B. The sets A and B are arranged adjacent to each other in the second direction D2. Herein, adjacent ones of the intermediate portions Sm in the set A and the set B are shifted in position from each other in the first direction D1. Therefore, at the intermediate portions Sm and Gm, the two adjacent signal contacts S are far distant from each other by a horizontal distance Hs. Accordingly, crosstalk is reduced.
The contacting portions Sc and Gc and the holding portions Sp and Gp are arranged in two rows extending in the second direction D2 and in a staggered fashion as shown in
As will be understood from the foregoing description, the contacts are classified into a first type, i.e., upper-row contacts whose holding portions Sp and Gp are arranged in the upper row and a second type, i.e., lower-row contacts whose holding portions Sp and Gp are arranged in the lower row. As shown in
The dummy ground contacts Gud and Gld serve to decrease or compensate a difference in impedance between the pairs of the signal contacts S and to achieve an impedance condition equivalent to another paired signal contacts S.
Herein, description will briefly be made of an assembling process of the connector 1.
At first, the lower-row contacts are temporarily or provisionally inserted into the housing 2. After a carrier 11 is folded and separated from the lower-row contacts, the lower-row contacts are press-fitted into the housing 2.
Next, the upper-row contacts are temporarily or provisionally inserted into the housing 2. After the carrier 11 is folded and separated from the upper-row contacts, the upper-row contacts are press-fitted into the housing 2.
Subsequently, the housing 2 is coupled to the shell 3.
Thus, the assembling process is completed.
Referring to
Like the connector illustrated in
The connector in
Referring to
The paired signal contacts S and the ground contact G in each of the sets A and B are formed so that the intermediate portions Sm of the paired signal contacts S are bent towards the intermediate portion Gm of the ground contact. With this structure also, crosstalk is reduced.
In
While the present invention has thus far been described in connection with a few embodiments thereof, it will readily be possible for those skilled in the art to put this invention into practice in various other manners.
Number | Date | Country | Kind |
---|---|---|---|
2006-042231 | Feb 2006 | JP | national |
Number | Name | Date | Kind |
---|---|---|---|
6350134 | Fogg et al. | Feb 2002 | B1 |
6540559 | Kemmick et al. | Apr 2003 | B1 |
20040058572 | Fromm et al. | Mar 2004 | A1 |
Number | Date | Country |
---|---|---|
5-716 | Aug 1994 | JP |
3564555 | Nov 2002 | JP |
2004 534358 | Nov 2004 | JP |
2005-503656 | Feb 2005 | JP |
Number | Date | Country | |
---|---|---|---|
20070197064 A1 | Aug 2007 | US |