JP2014002885A - Electric connector for high-speed transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connector for high-speed transmission capable of reducing noise at a narrow pitch in a conventional electric connector for high-speed transmission.SOLUTION: In an electric connector for transmitting a high-speed signal, provided is an electric connector 1 for high-speed transmission in which, with respect to a plurality of contacts 4 arranged in one lateral stage or two vertical stages in a junction part for bonding with a partner-side connector so as to form one lateral line, a contact part between one set of contacts for high-speed transmission and another among the contacts arranged so as to form one lateral line configure pulled-out pins 7a.

Description

  The present invention relates to an electrical connector for high-speed transmission used for small I / O.

  Conventionally, the arrangement of contacts in an electrical connector used for high-speed transmission is, for example, two rows of contact portions and a staggered pitch and a soldering portion in a staggered arrangement, but the soldering portion requires pitch conversion (Patent Document) 1), in addition, one row of contact portions and a grid arrangement of soldering portions, except that signals are arranged in front and rear of the ground of the soldering portion (see Patent Document 2). Yes.

JP 2007-115707 A JP 2007-179960 A

  However, in the conventional high-speed transmission electrical connector, a large number of contacts are densely packed at a narrow pitch between the right angle type contacts and the soldering holes of the printed circuit board to be mounted. Therefore, the presence of the ground line between the signal lines causes noise to be interrupted by crosstalk and adversely affect signal transmission. As the number of signal lines of the electrical connector increases, the contacts are right-angle type, and even if the soldering holes on the printed circuit board are arranged in a staggered manner so that the spacing is widened, there is a limit in itself, and high-speed transmission is possible. Will be hindered. Therefore, the high-speed transmission electrical connector according to the present invention has been proposed in order to solve such a problem.

  The gist for solving the above-mentioned problems of the high-speed transmission electrical connector according to the present invention is to achieve a high-speed signal transmission electrical connector with a horizontal one or two upper and lower stages at the joint portion to be joined to the mating connector. A plurality of contacts arranged in a row is a contact pin between a pair of contact groups for high-speed transmission out of contacts arranged in a row.

The one set of contacts for high-speed transmission is two adjacent signal contacts and a ground contact located on one or both sides of the two adjacent signal contacts.
Further, the number of extraction pins in the contact portion includes the same number as that of one set of contact groups for high-speed transmission.

  According to the electrical connector for high-speed transmission of the present invention, the pair of contact groups for high-speed transmission is made into a pin, so that high-speed transmission can be supported while maintaining fitting compatibility with existing products. I can do it. In addition, in a high-speed transmission signal, noise entering the signal is reduced and noise (crosstalk) resistance is improved. The printed circuit board on which the high-speed transmission electrical connector is mounted has many excellent effects that the design of the board wiring becomes easy and the shortest wiring becomes possible.

The structure of the electrical connector 1 for high-speed transmission which concerns on this invention is shown, It is the top view (A) except a contact, a rear view (B), and a longitudinal cross-sectional view (C). It is the front view (A) of the electrical connector 1 for high-speed transmission of the same invention, and the layout (B) of the attachment hole of a corresponding printed circuit board. It is explanatory drawing (A), (B), (C) which shows the mode of the influence of the noise between contacts in the electrical connector 1 for high-speed transmission. It is a top view which shows the wiring state of the printed circuit board corresponding to the electrical connector 1 for high-speed transmission which concerns on this invention. The front view (A) of the electrical connector for high-speed transmission which combined the same high-speed system and the low-speed system, and the layout (B) of the mounting hole of the printed circuit board corresponding to this electrical connector.

  As shown in FIG. 1, the high-speed transmission electrical connector 1 according to the present invention is configured to reduce the crosstalk in high-speed transmission by appropriately using a contact as a pin.

  The electric connector 1 for high-speed transmission is formed in an insulating housing 2 made of synthetic resin, a metal cover (shell) 3 of a joint 2b, a storage hole 2a provided in the insulating housing 2, and an alignment plate 5 for a printed circuit board. It comprises a contact 4 bent and accommodated in the provided holes 5a and 5b and arranged in two upper and lower stages, and a grounding fitting 6 attached to the insulating housing 2.

  In the electrical connector 1 for transmitting a high-speed signal, a plurality of contacts 4 arranged in one horizontal row or two horizontal rows in a joint portion 2b to be joined with the mating connector are shown in FIG. As described above, a contact portion between a pair of contact groups 7, 7... For high-speed transmission among the contacts 4 arranged in a horizontal line is formed as a punch pin 7a.

  In FIG. 2A, the set of contacts 7 for high-speed transmission is the three contacts indicated by symbols on the top for the sake of convenience, and the contents of the symbols are S for signal. It is a contact and G indicates that it is a contact for grounding. In high-speed differential transmission, noise resistance improves as the electromagnetic field coupling between Sig (+) and Sig (−) increases. Therefore, in order not to reduce the noise resistance, other transmission lines and GND (G) contacts are prevented from entering between the S and S contacts.

  Thus, the set of contact groups 7 for high-speed transmission is composed of two adjacent signal contacts and a ground contact located on one or both sides of the two adjacent signal contacts. Is done. For example, the contact group is not limited to the above three contact groups of S, S, and G, and may be a contact group having an arrangement of G, S, S, and G.

  The extraction pin 7a is in a state in which three contacts are extracted and not arranged between the pair of contact groups (SSG), (SSG) 7 arranged in the horizontal row. As shown in FIG. 3 (A), the influence of the amount of noise in the transmission characteristics is determined by the coupling state of the electromagnetic field between the noise source transmission line and the noise-source transmission line, and the vertical direction <between adjacent points <diagonal direction. Noise resistance in this order.

  More specifically, as shown in FIGS. 3B and 3C, the strength of the coupling state of the electromagnetic field is such that the thicker the arrow, the stronger the coupling strength, and the arrows that converge between the paired signals. The more, the stronger the noise resistance. Moreover, the arrow shown with a broken line has shown the location which is easy to couple | bond with another metal (a contact, a shell, etc.) rather than couple | bonding with the signal line which makes a pair. Among them, the signal coupled with the other signal part (Sig) becomes noise, and the degree of influence depends on the coupling strength (thickness and number of arrows). Noise resistance also increases when there are many bonds between the broken arrow and GND.

  Therefore, if the noise source transmission line and the noise-source transmission line have the same structure, GND (G) may be inserted between them or the interval may be widened. For this reason, the contacts are removed in order to increase the distance between the pair of contact groups 7.

  In the punch pin 7a, the number of pull pins in the contact portion is the same as the number of contact groups 7 for a high-speed transmission. There is no particular rule regarding this number, but considering the influence of noise, it is better to widen the interval, so the number is equal to or greater than the number of contact groups 7 in one set.

  As shown in FIG. 2A, the extraction pins 7a are alternately set in the horizontal direction in the upper and lower stages in the vertical direction, and are arranged in a staggered manner. As shown in FIG. 2B, the soldering holes (holes) 8a of the printed circuit board 8 into which the legs of the contacts 4 are inserted are arranged in a staggered manner in the front and rear. The virtual hole locations 8b on the printed circuit board 8 from which the pins are removed are shown in a staggered arrangement.

  2A, the upper contacts 4 (pin Nos. 1 to 13) and the lower contacts 4 (pins No. 14 to 26) are connected to each other as shown in FIGS. As shown in C), a right angle type that is bent in a direction orthogonal to the connection direction and penetrates through the hole 8a of the printed circuit board 8 is arranged in a staggered manner in the front and rear. The connection of the contact 4 to the printed circuit board 8 has been described as a soldering type of a pin penetrating the printed circuit board, but the present invention can also be applied to a surface mounting (SMT) type.

  Thus, in the high-speed transmission electrical connector 1 of the type having only a high-speed transmission path, crosstalk between contact groups is reduced and noise resistance is improved. Also on the printed circuit board 8, as shown in FIG. 4, it is possible to wire straightly in the routing of the circuit 9, so that a high-speed differential transmission line can be wired optimally and at the shortest distance.

  Further, there is no need to wire a differential transmission path between the distance a from the substrate end surface of the printed circuit board 8, the circuit wiring on the printed circuit board 8 can be easily routed, and the board design constraints are reduced. Become.

  In the high-speed transmission electrical connector 1 shown in FIG. 2, all the contacts 4 are contacts for a high-speed transmission path. However, as shown in FIGS. There are also mixed type contacts 4 and 10.

  The signal arrangement of the high-speed system is the same as in FIGS. 2 and 4, and the portion that is not pinned out on the lower side is used as a “power supply”, “GND”, or “low-speed system” signal. Even if the “power supply” and “GND” are arranged “between the upper and lower sides” and “between adjacent” of the noise source transmission path, there is almost no influence. In addition, the relationship between noise resistance is `` between upper and lower <between adjacent points <diagonal '', the absolute value of the amount of noise changes depending on the signal speed of the noise source, and the faster the signal speed, the faster Noise becomes stronger.

  For example, in the embodiment, the “high speed system” is a 2 Gbps differential signal with an amplitude of 0.3 Vp-p, the “low speed system” is a 2 Mbps single-ended signal with an amplitude of 3.0 Vp-p, and “high speed system” and “low speed system” Is placed between `` up and down '', when `` high-speed system '' is a noise source, about 3.6% (≒ 0.01 V) of 0.3 Vp-p propagates as noise to the `` low-speed system '' transmission path, but low-speed system Since the amplitude of is 3.0Vp-p, it has almost no effect.

  In addition, when the “low speed system” is a noise source, about 0.01% (≈0.0003V) of 3.0Vp-p propagates as noise to the “high speed system” transmission line, but the high speed system has an amplitude of 0.3V, so there is almost no effect. .

  The lower part (pin Nos. 14 to 26) in the connection portion 2b of the high-speed transmission electrical connector 1 shown in FIG. 5A has no extraction pin, and a group of the high-speed contact 4 and the low-speed contact 10 is formed. Alternatingly arranged. As shown in FIG. 5B, on the printed circuit board 8, the holes 8a for the high-speed contacts 4 are arranged in a staggered manner, and the holes 8d for the low-speed contacts 10 are the holes of the preceding high-speed system. 8a is provided.

  In this way, even when high-speed and low-speed contacts coexist, noise resistance can be improved by providing the extraction pin 7a between the high-speed contact groups 7, 7,.

  The high-speed transmission electrical connector 1 according to the present invention is applicable to general high-speed electrical contacts.

1 Electrical connector for high-speed transmission
2 Insulating housing, 2a storage hole,
2b connection part,
3 Cover (shell),
4 Contact,
5 alignment plate, 5a, 5b hole,
6 Grounding bracket,
7 One set of contacts, 7a Extraction pin,
8 printed circuit board, 8a hole
8b Virtual hole location, 8c Ground bracket hole,
8d Low speed contact hole,
9 circuit,
10 Low speed contact.

Claims (3)

For electrical connectors for high-speed signal transmission, a plurality of contacts arranged in a horizontal row in one horizontal step or two upper and lower steps at the joint to be joined with the mating connector are used for high-speed transmission among contacts arranged in a horizontal row The contact portion between a pair of contact groups of
An electrical connector for high speed transmission. One set of contacts for high-speed transmission is two adjacent signal contacts and a ground contact located on one or both sides of the two adjacent signal contacts;
The electrical connector for high-speed transmission according to claim 1. The number of extraction pins in the contact part is the same as the number of contact groups for a high-speed transmission,
The electrical connector for high-speed transmission according to claim 1 or 2.

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