JP2011119123A - Connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connector capable of attaining impedance matching of all signal terminals for signals including high-speed signals and low-speed signals and sufficiently securing connection strength. <P>SOLUTION: The connector 1 has the signal terminals S and ground terminals G connected to pads formed on a board, the length of a contact section 11 with the pad of the signal terminal S is shorter than a contact section 12 with the pad of the ground terminal G. Furthermore, the length of the contact section 11 is set on the basis of the impedance matching, and the length of the contact section 12 is set on the basis of connection strength. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a connector that enables signal transmission between electronic components.

  In various electronic devices such as computers, connectors that enable signal transmission from a printed board on which electronic components are mounted to another printed board are used. Such connectors are required to stabilize high-speed signal transmission processing with the recent advancement of communication systems. As a cause that hinders stabilization of high-speed transmission, there is impedance mismatching at the connection portion of the connector.

  FIG. 6 illustrates the structure of a conventional connector 101. The connector 101 includes a signal terminal S and a ground terminal G. 7 and 8 show a connection portion (VII-VII ′ cross section and top surface) of the signal terminal S and the ground terminal G to the printed circuit board. The front ends of the signal terminal S and the ground terminal G are contact portions 111 and 112 that contact a pad 121 formed on the printed circuit board 120. The pad 121 is connected to a copper foil 122 as electrical wiring. As shown in FIG. 8, the contact portions 111 and 112 have a length L and a width M, and the pad 121 has a length P and a width Q. And the relationship of P> L and Q> M exists. This is mainly for easy and reliable soldering between the contact portions 111 and 112 and the pad 121.

  As described above, when the width Q of the pad 121 is larger than the width M of the contact portions 111 and 112, the impedance of the pad 121 is lower than that of the contact portions 111 and 112, and impedance mismatch occurs. easy. The influence of the width Q becomes larger as the length P becomes longer. However, when the P is reduced, the connection strength between the substrate 120 and the connector 101 decreases.

  Patent Document 1 discloses a configuration in which the width of a pad connected to a signal line for a high-speed signal is made narrower than the width of a pad connected to a signal line other than the high-speed signal in order to cope with the above-described problem. . Thereby, suppression of impedance mismatch in the signal line of the high-speed signal and securing of connection strength are achieved.

  Patent Document 2 discloses a configuration for a flat cable connector in which the length of a movable terminal portion is shortened without being affected by variations in processing accuracy in order to improve transmission performance of signals in a high frequency band. Has been.

  In Patent Document 3, a connector connected to a printed wiring board composed of a through hole having a conductor formed therein and an electronic circuit mounted on the surface thereof, in order to support high-speed serial I / F, A configuration including a through-hole pin that can be inserted into a through-hole and a pin that can be mounted on a substrate is disclosed.

JP 2008-71948 A JP 2004-22516 A JP 2009-123349 A

  However, the configuration described in Patent Document 1 separates the signal line into a high speed side and a low speed side (other than the high speed), and achieves impedance matching of only the high speed signal line. There is a high possibility of inconsistencies. There is also a problem that it can be applied only to a mounting component in which the high speed side and the low speed side are fixed.

  Accordingly, an object of the present invention is to achieve impedance matching of all signal lines (terminals) including high speed and low speed, and to ensure sufficient connection strength.

  A first aspect of the present invention includes a signal terminal and a ground terminal connected to a pad formed on a substrate, and a length of a contact portion of the signal terminal with the pad is different from that of the pad of the ground terminal. It is a connector characterized by being shorter than a contact part.

  According to the present invention, the length of the contact portion of the signal terminal can be set based on impedance matching, and the length of the contact portion of the ground terminal that does not adversely affect the matching can be determined as a connection strength. Can be set based on. As a result, impedance matching of all signal terminals including high speed and low speed can be achieved, and sufficient connection strength can be ensured.

It is a top view which shows the characterizing portion of the connector which concerns on Embodiment 1 of this invention. 3 is a side cross-sectional view showing a connection portion of the signal terminal according to Embodiment 1. FIG. 3 is a side cross-sectional view showing a connection portion of a ground terminal according to Embodiment 1. FIG. FIG. 3 is a top view showing a connection portion of signal terminals according to the first embodiment. 3 is a top view showing a connection portion of a ground terminal according to Embodiment 1. FIG. It is a top view which illustrates the structure of the conventional connector. It is side surface sectional drawing which shows the connection part of the signal terminal or ground terminal of the conventional connector. It is a top view which shows the connection part of the terminal of the conventional connector.

Embodiment 1
FIG. 1 shows a characteristic part of the connector 1 according to the present embodiment. The connector 1 includes a plurality of signal terminals S and a plurality of ground terminals G.

  The signal terminal S is a terminal for transmitting a signal to be processed between a plurality of mounted components connected by the connector 1. The ground terminal G is a terminal for connecting to a ground wire and grounding a mounted component. The signal terminal S and the ground terminal G are extended outward from the housing 13. In the present invention, various forms are allowed for the number and arrangement of the terminals S and G, the shape of the housing 13, and the like. Although not shown, the connector 1 may include a power supply terminal in addition to the signal terminal S and the ground terminal G.

  FIG. 2 shows a connection portion of the signal terminal S (II-II ′ cross section of FIG. 1). As shown in FIGS. 1 and 2, the tip of the signal terminal S is a contact portion 11 that contacts a pad 21 formed on the substrate 20. The contact portion 11 is fixed to the pad 21 by soldering or the like. The pad 21 is connected to a copper foil 22 connected to a terminal of a predetermined mounting component. In the present embodiment, the length of the contact portion 11 is L1.

  FIG. 3 shows a connection portion of the ground terminal G (III-III ′ cross section in FIG. 1). As shown in FIGS. 1 and 3, the tip of the ground terminal G is a contact portion 12 that contacts a pad 25 formed on the substrate 20. The contact portion 12 is fixed to the pad 25 by soldering or the like. The pad 25 is connected to a copper foil 26 connected to the ground. In the present embodiment, the length of the contact portion 12 is L2. When the power supply terminal is included, the length of the contact portion is preferably the same as that of the ground terminal G.

  FIG. 4 shows the connection portion of the signal terminal S from above. The length P1 of the pad 21 to which the contact portion 11 is connected is slightly longer than the length L1 of the contact portion 11, and the width Q1 of the pad 21 is slightly longer than the width M1 of the contact portion 11. . This is mainly for making soldering easy and reliable. FIG. 5 shows the connection portion of the ground terminal G from above. The length P2 of the pad 25 to which the contact portion 12 is connected is slightly longer than the length L2 of the contact portion 12, and the width Q2 of the pad 25 is slightly longer than the width M2 of the contact portion 12. . This is also mainly for easy and reliable soldering as in the case of the signal terminal S. When the power supply terminal is included, the shape of the pad connected to the power supply terminal is preferably the same as that of the ground terminal.

  As described above, in the present embodiment, the length L1 and the length L2 have a relationship of L1 <L2, and accordingly, the length P1 and the length P2 are P1 <P2. Have a relationship. Here, the impedance mismatch caused by the pad 21 is caused by the difference between the width Q1 and the width M1, but the length L1 of the pad 21 according to the present embodiment is the length L2 of the pad 25. Therefore, the mismatch is sufficiently smaller than that of the pad 25. Therefore, by making the length of the contact portion 11 of the signal terminal S as short as possible, impedance mismatch at the pad 21 portion can be suppressed, and high-speed communication can be realized in a stable state. Become.

  Further, regarding the ground terminal G (and the power supply terminal), even if the length L2 of the contact portion 12 (the length P2 of the pad 25) is relatively long, the adverse effect on high-speed communication is small. Accordingly, the length L2 of the contact portion 12 and the areas P2 and Q2 of the pad 25 are designed so that sufficient connection strength is obtained between the connector 1 and the substrate 20 (about the power supply terminal). Is the same).

  According to the connector 1 having the above configuration, high reliability in high-speed communication and sufficient mechanical strength can be realized.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Connector 11,12 Contact part 13 Housing | casing 20 Board | substrate 21,25 Pad 22,26 Copper foil G Ground terminal S Signal terminal

Claims (4)

Provided with a signal terminal and a ground terminal connected to a pad formed on the substrate,
The length of the contact portion of the signal terminal with the pad is shorter than the contact portion of the ground terminal with the pad.
connector. The length of the contact portion of the signal terminal is set based on impedance matching,
The length of the contact portion of the ground terminal is set based on connection strength.
The connector according to claim 1. A power terminal connected to the pad;
The length of the contact portion of the power terminal with the pad is longer than the length of the contact portion of the signal terminal,
The connector according to claim 2. The length of the contact portion of the power terminal is set based on connection strength.
The connector according to claim 3.

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