JP2014175248A - Connector having terminal structure for realizing high-speed signal transmission - Google Patents

Abstract

An object of the present invention is to provide a connector having a terminal structure capable of achieving high-speed signal transmission by changing the terminal structure as much as possible.
A terminal group includes a first terminal group and a second terminal group. In particular, the terminals constituting the first terminal group include a ground terminal located at the center, and each of one side and the other side sandwiching the ground terminal. Two signal terminals provided on the side are included, each having a contact portion, a mounting portion, and an intermediate portion connecting them. The length of the intermediate portion of each of the ground terminal, the signal terminal arranged on one side close to the ground terminal, and the signal terminal arranged on the other side close to the ground terminal is one side. The signal terminal disposed on the side far from the ground terminal and the signal terminal disposed on the other side far from the ground terminal are set to be longer than the length of the intermediate portion.
[Selection] Figure 1

Description

  The present invention relates to a connector having a terminal structure for realizing high-speed signal transmission.

  With the development of information technology, connectors used in personal computers, mobile phones, digital cameras, music players, and other electronic devices are required to increase the signal transmission speed in a more stable manner. Patent Document 1 discloses an example of a connector currently used for high-speed signal transmission. This connector includes a first terminal group and a second terminal group, and is compatible with both the USB 2.0 standard and the USB 3.0 standard. Here, the first terminal group is used only for USB 3.0, the second terminal group is used for both USB 2.0 and USB 3.0, and the first terminal group is Used only with two terminal groups.

  Each of the first terminal group and the second terminal group includes a total of five terminals. Each terminal is disposed along the fitting direction with the mating connector, and is disposed in parallel with adjacent terminals. The first terminal group includes a ground terminal located at the center, and two signal terminals provided on each of one side and the other side sandwiching the ground terminal. On the other hand, the second terminal group includes a pair of signal terminals and power supply terminals. In particular, the five terminals included in the first terminal group have a symmetrical structure with respect to the ground terminal, and each terminal is in contact with the corresponding terminal of the mating connector when mated with the mating connector. Part, a mounting part mounted on the substrate, and a substantially L-shaped intermediate part in side view connecting the contact part and the mounting part. In particular, the contact portion extends linearly from the same tip position along the fitting direction with the mating connector toward the mounting portion.

  As is well known, the two signal terminals provided on one side of the ground terminal are used for transmission, and the two signal terminals provided on the other side are used for reception The two signal terminals provided on each side form a differential pair with the ground terminal located at the center. It is important to achieve impedance matching within each of these differential pairs. This is because the mismatch of the impedance characteristics causes a timing shift (skew) in the signals transmitted to each of the signal terminals forming the differential pair, thereby degrading the transmission characteristics. In order to achieve high-speed signal transmission, it is also important to keep crosstalk between terminals low in addition to preventing skew.

JP 2011-134625 A

  In general, the terminals constituting the first terminal group and the second terminal group all have substantially the same size and shape. In realizing high-speed signal transmission, the inventors of the present application tried to change the structure of these terminals, particularly the terminal structure of the first terminal group. However, there are some things to be careful about when making such changes. Among the components of each terminal, in particular, the width of the contact portion in the pitch direction with the adjacent terminals is substantially determined in relation to the distance between the terminals to the adjacent terminals. In addition, the width of the mounting portion cannot be changed greatly because the width of the mounting portion is substantially determined in relation to the solder spread when the mounting portion is soldered to the substrate. The inventors of the present application tried to realize high-speed signal transmission by changing the terminal structure for portions other than the contact portion and the mounting portion in consideration of these circumstances.

  First, a simulation analysis was performed on a normal terminal structure with respect to impedance, skew, and crosstalk, which would be important elements for realizing high-speed signal transmission. As a result, an analysis result of an impedance of about 75 to 92Ω, a skew of about 0.01 ns, and a crosstalk of about −35 db was obtained. In addition, the impedance in this analysis result is represented as a numerical value width when three pieces included in the differential pair are collectively measured. For example, in the above example, the impedance is included in each differential pair. This means that the impedances of all terminals are within a range of about 75 to 92Ω.

  As a result of repeating trial and error, among each of the intermediate portions of the signal terminal disposed on the side close to the ground terminal on one side across the ground terminal and the signal terminal disposed on the side close to the ground terminal on the other side, A signal terminal arranged on the side far from the ground terminal on one side across the ground terminal, with a part of the length of the intermediate part extending linearly along the mating direction with the mating connector in a state continuous with the contact part It was found that comparatively good analysis results can be obtained when the length of each of the signal terminals arranged on the far side from the ground terminal on the other side is set longer than the partial length. In this case, the impedance was about 80 to 92.5Ω, the crosstalk was about −37 db, and no skew was detected.

However, although some improvement has been seen, for example, in order to achieve signal transmission at a speed higher than that of USB 3.0, the above analysis values are still not sufficient for crosstalk.
The present invention provides a connector having a terminal structure that can improve the skew and improve the crosstalk by changing the terminal structure as much as possible, and can achieve higher-speed signal transmission than USB 3.0. The purpose is to provide.

The present invention includes an insulating housing, a conductive shell covering the outside of the housing, a first terminal group and a second terminal group supported by the housing, and the first terminal group And each of the second terminal groups is composed of five terminals, and these five terminals are arranged in parallel with each other along the pitch direction of adjacent terminals and along the fitting direction with the mating connector. The five terminals constituting the first terminal group include a ground terminal located at the center and two signals provided on each of one side and the other side across the ground terminal. The five terminals are symmetrical with respect to the ground terminal, and the five terminals constituting the first terminal group are each in the state of being mated with the mating connector. With the corresponding terminal of the mating connector A contact portion that can be touched, a mounting portion that is mounted on a substrate, and an intermediate portion that connects the contact portion and the mounting portion. The contact portion is the same along the fitting direction with the mating connector. Extending linearly from the tip position toward the mounting portion, the ground terminal, the signal terminal disposed on the one side close to the ground terminal, and the ground terminal on the other side The length of the intermediate portion in each of the signal terminals arranged on the side close to the signal terminal is the signal terminal arranged on the side far from the ground terminal on the one side and from the ground terminal on the other side. The connector is characterized in that it is set longer than the length of the intermediate portion of each of the signal terminals arranged on the far side.
According to this connector, the timing shift (skew) that can occur in the signal transmitted to the signal terminal can be reduced, and crosstalk can be achieved at higher speed than USB 3.0. It can be reduced to a good value.

  In the above connector, for example, among the substantially L-shaped intermediate portion in side view, a partial length of the intermediate portion extending linearly along the fitting direction with the mating connector in a state of being continuous with the contact portion. The partial length of each of the ground terminal, the signal terminal disposed on the one side close to the ground terminal, and the signal terminal disposed on the other side close to the ground terminal. Is longer than the partial length of each of the signal terminal disposed on the side far from the ground terminal on the one side and the signal terminal disposed on the side far from the ground terminal on the other side. Is set.

In the connector, a width of the intermediate portion in the pitch direction may be wider than that of the contact portion.
According to this configuration, impedance matching can be achieved more effectively.
In the connector, the impedance of the five terminals constituting the first terminal group is preferably in the range of 90 ± 10Ω.

  In the connector, the second terminal group may be arranged in parallel with each other along the pitch direction (A) of the adjacent terminals and along the fitting direction (A) with the mating connector. Good.

  In the connector, the first terminal group is used together with the second terminal group when the connector is used in the USB 3.0 standard, and the second terminal group is used in the USB 2.0 standard. When used, it is used alone.

  According to the present invention, there is provided a connector having a terminal structure that can improve skew and at the same time improve crosstalk, and can perform signal transmission at a higher speed than USB 3.0.

It is a front view of the connector by one Embodiment of this invention. FIG. 2 is a rear perspective view of the connector of FIG. 1. It is sectional drawing of the connector of FIG. 1, Comprising: (a) is an AA sectional view, (b) is a BB sectional drawing. It is a back perspective view of the housing which has the terminal group integrally formed. It is a figure which shows the arrangement | sequence state of the terminal contained in the terminal group arranged in one fitting part, Comprising: (a) is a top view, (b) is a side view, (c) is a bottom perspective view.

Hereinafter, a connector according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
As a result of repeating trial and error and earnestly advancing research, the inventors of the present application have improved skew as well as crosstalk according to the connector having the terminal structure described below, which is better than USB 3.0. It was also found that high-speed signal transmission is possible. When the terminal structure included in this connector was used, the impedance was about 82.5 to 94Ω, that is, in the range of 90 ± 10Ω, the crosstalk was about −41 db, and no skew was detected.

  FIG. 1 shows a front view of the connector (receptacle connector) 10 and FIG. 2 shows a rear perspective view thereof. The connector 10 is a so-called Micro-USB connector, which is an insulating resin housing 12, a conductive metal shell 24 that covers the outside of the housing 12 in a substantially cylindrical shape, and a housing. 12 includes a first terminal group 30 and a second terminal group 60 supported by 12. In actual use, the connector 10 is used in a state of being mounted on a substrate (not shown).

  This connector 10 includes two fitting portions 28 and 29 having different widths, and the width of the mating connector provided in each of the fitting portions 28 and 29 corresponding to each of the fitting portions. Different fitting ports (not shown) can be fitted. A first terminal group 30 and a second terminal group 60 are provided in the fitting portions 28 and 29, respectively. Here, the first terminal group is used only for USB 3.0, the second terminal group is used for both USB 2.0 and USB 3.0, and the first terminal group 30 has a connector. The second terminal group 60 is used together with the second terminal group 60 when used in the USB 3.0 standard, and the second terminal group 60 is used alone when the connector is used in the USB 2.0 standard. In order to facilitate the mating of the mating connector, the guiding portion 42 may be formed by the shell 24 around the fitting ports of the fitting portions 28 and 29.

  The shell 24 is preferably formed from a single metal plate. Thereby, reduction of manufacturing cost and material cost can be aimed at. For example, it can be formed by punching a metal plate into a predetermined shape and then bending it into a substantially cylindrical shape. By this method, the fitting portions 28 and 29 can be easily formed by bending the shell 24 and providing the partition 35. In the present embodiment, the intermediate portion 35 </ b> A on the fitting portion 29 side is bent so as to be an inclined surface 37, and the intermediate portion 35 </ b> B on the fitting portion 28 side is bent as a vertical surface 38. A locking projection provided at the tip of the shell of the mating connector inserted into the fitting portion 29 is locked into the locking hole 52 provided in the top plate 36 of the shell 24. By engaging them, the connector 10 and the mating connector can be locked.

The first terminal group 30 and the second terminal group 60 are each composed of five terminals. In the first terminal group 30 and the second terminal group 60, these five terminals are in the pitch direction of adjacent terminals. 1 are arranged in parallel to each other along the direction indicated by the arrow “A” in FIG. 1 and along the direction of fitting with the mating connector (the direction indicated by the arrow “A” in FIG. 2). .
The five terminals constituting the first terminal group 30 include a ground terminal 30G located at the center, two signal terminals 30S ₂ and 30S ₁ provided on one side of the ground terminal 30G, and a ground terminal 30G. Two signal terminals 30S ₃ and 30S ₄ provided on the other side across the line are included. These terminals have a symmetrical structure around the ground terminal 30G, and the signal terminal 30S ₂ disposed on the side close to the ground terminal 30G and the signal terminal 30S ₁ disposed on the side far from the ground terminal 30G are: A differential pair is formed together with the ground terminal 30G. Similarly, the signal terminal 30S ₃ disposed on the side close to the ground terminal 30G and the signal terminal 30S ₄ disposed on the side far from the ground terminal 30G are The other differential pair is formed together with the terminal 30G. Therefore, it is important to achieve impedance matching within each of these differential pairs.

  On the other hand, the five terminals included in the second terminal group 60 are a pair of signal terminals and a power supply terminal. These terminals are conventionally used as the USB 2.0 standard, and these conventional terminals can be used as they are. Since the configuration and operation of the second terminal group 60 are well known, they will not be described in detail here.

The five terminals included in the first terminal group 30, that is, the terminals 30S ₁ , 30S ₂ , 30G, 30S ₃ , and 30S ₄ are similarly adapted to the USB standard. With regard to, the structure has been slightly changed in order to achieve signal transmission at a higher speed than USB 3.0.

FIG. 3 shows a detailed terminal structure of the five terminals 30S ₁ , 30S ₂ , 30G, 30S ₃ , and 30S ₄ included in the first terminal group 30. 3A is a top view, FIG. 3B is a side view, and FIG. 3C is a bottom perspective view.
These five terminals 30S _{1 to} 31S ₄ , 30G have contact portions 31S ₁ , 31S ₂ , 31G, 31S ₃ , 31S ₄ that can come into contact with the corresponding terminals of the mating connector when fitted to the mating connector, respectively. Mounting portions 33S ₁ , 33S ₂ , 33G, 33S ₃ , 33S ₄ mounted on the substrate, and further, these contact portions 31S ₁ , 31S ₂ , 31G, 31S ₃ , 31S ₄ and mounting portions 33S ₁ , 33S ₂ , 33G , 33S ₃ , 33S ₄ are connected, for example, intermediate portions 32S ₁ , 32S ₂ , 32G, 32S ₃ , 32S ₄ having a substantially L shape in side view are included. In particular, the contact portions 31S ₁ , 31S ₂ , 31G, 31S ₃ and 31S ₄ have the same tip positions 31S ₁ ',' 31S ₂ ', 31G' along the fitting direction with the mating connector (arrow "A" in the figure). , 31S ₃ ′, 31S ₄ ′, linearly extend in the same plane as contact portions of adjacent terminals toward the mounting portion 33 side. Note that the width of the intermediate portion 32 in the pitch direction with adjacent terminals may be wider than that of the contact portion 31 and the mounting portion 33. When widening, the impedance was improved from 95.9Ω to 91Ω by the same simulation as described above. Therefore, such widening is considered effective for impedance matching.

In order to improve skew and at the same time improve crosstalk and realize signal transmission at a higher speed than USB 3.0, in the present application, the ground terminal 30G is arranged on one side closer to the ground terminal 30G. The length of each of the intermediate portions 32S ₂ , 32G, 32S ₃ of the signal terminal 30S ₂ and the signal terminal 30S ₃ arranged on the other side close to the ground terminal 30G is the ground terminal on one side. The signal terminal 30S ₁ disposed on the side far from 30G and the signal terminal 30S ₄ disposed on the side far from the ground terminal 30G on the other side are set longer than the lengths of the intermediate portions 32S ₁ and 32S ₄ respectively. Has been. For example, in the intermediate portion 32 that is substantially L-shaped when viewed from the side, the partial length of the intermediate portion 32 that extends linearly along the fitting direction with the mating connector in a state of being continuous with the contact portion 31 ( 3 (b) and 3 (c), the ground terminal 30G, the signal terminal 30S ₂ disposed on one side close to the ground terminal 30G, and the other side Of the signal terminal 30S ₃ arranged on the side closer to the ground terminal 30G in each of the signal terminals 30S ₁ arranged on the side farther from the ground terminal 30G on the one side, the ground terminal signal terminals 30S ₄ disposed farther from 30G on the side, from the portion of the length "a" in each, is set longer. The ground terminal 30G, the signal terminal 30S ₂ disposed on the side closer to the ground terminal 30G on one side, and the signal terminal 30S ₃ disposed on the side closer to the ground terminal 30G on the other side are the same size. It would be preferable to have a thickness and shape. Similarly, the signal terminal 30S ₁ disposed on the side far from the ground terminal 30G on one side and the signal terminal 30S ₄ disposed on the side far from the ground terminal 30G on the other side have the same size and shape. It is considered preferable to have By adopting such a configuration, it is possible to reduce the skew that may occur in the signal transmitted to the signal terminal, and it is also a good value for achieving crosstalk and signal transmission at a speed higher than USB 3.0. It can be reduced to.

  FIG. 4 is a rear perspective view of the housing 12. The housing 12 includes a main body 15, holding parts 16 and 17 extending from the main body 15 toward the fitting side, and a cover provided so as to protrude rearward on one side in the longitudinal direction of the main body 15. 19 The first terminal group 30 is integrally formed (insert molding) with respect to the housing 12 while being supported by the holding portion 16 and the main body portion 15, while the second terminal group 60 is formed by the holding portion 17 and the main body portion 15. In addition, it is integrally formed with the housing 12 while being supported by the cover 19. In particular, the contact portion 31 of the first terminal group 30 is held by the holding portion 16 with its lower side, that is, the contact portion with the corresponding terminal of the mating connector exposed. The same applies to the second terminal group 60.

  The integrally formed first terminal group 30 and second terminal group 60 and the housing 12 are formed on the substantially cylindrical body formed by the shell 24 and behind the substantially cylindrical body (opposite the fitting port with the mating connector). Is inserted from. As shown in FIG. 2, after the housing 12 is inserted, the caulking piece 44 provided at the rear end of the shell 24 is caulked to the caulking portion 21 provided so as to protrude rearward of the housing 12. The housing 12 and the shell 24 are completely fixed by bending 46 so as to be hooked on the rear edge 48 of the housing 12 and pressing the tongue piece 34 into a part of the housing 12.

FIG. 5A shows a cross-sectional view taken along the line AA of FIG. 1, and FIG. 5B shows a cross-sectional view taken along the line BB of FIG. When the housing 12 is completely fixed to the shell 24, gaps are formed between the holding portions 16 and 17 of the housing 12 and the inner wall 38 of the top plate 36 of the shell 24. The holding portion 16 extends together with the first terminal group 30 to the fitting side in the fitting portion 28, and the holding portion 17 extends together with the second terminal group 60 to the fitting side in the fitting portion 29. . The cross-sectional view of FIG. 5 particularly shows the cross section of the first terminal group 30 and its periphery, but the second terminal group 60 can be considered similarly. As is clear from these cross-sectional views, each terminal of the first terminal group 30 formed integrally with the housing 12, for example, the terminal 30G shown in FIG. 5A or the terminal 30G in FIG. terminal 30S ₁ showing, respectively, at the bottom side of the holding portion 16, 17 of the housing 12, some of them, for example, and the contact portion 31G shown in FIG. 5 (a), shown in FIG. 5 (b) The bottom side of the contact portion 31S ₁ is exposed. These exposed portions are portions connected to the corresponding terminals of the mating connector fitted through the fitting ports 28 and 29. Further, each terminal of the first terminal group 30, for example, the terminals 30 </ b> G and 30 </ b> S ₄ shown in FIG. 5A and the terminals 30 </ b> S ₁ and 30 </ b> S ₂ shown in FIG. at near the end, some of them, for example, mounting portion 33G shown in (a) of FIG. 5, 33S ₄ and a state in which the mounting section 33S _1, 33S ₂ is exposed as shown in FIG. 5 (b) Is done. These exposed portions together with the solder portions 25 of the shell 24 become portions to be soldered to corresponding portions of the substrate.

  The present invention can be widely used for electrical connectors that require high-speed signal transmission.

10 Connector 12 Insulating housing 16 Holding part 17 Holding part 24 Metal shell 28 Fitting part 29 Fitting part 30 Contact 31 Contact part 32 Intermediate part 33 Mounting part 60 Contact

Claims (6)

An insulating housing;
A conductive shell covering the outside of the housing;
A first terminal group and a second terminal group supported by the housing;
The first terminal group and the second terminal group are each composed of five terminals, and these five terminals are fitted in parallel with each other along the pitch direction of adjacent terminals, and each is fitted with a mating connector. Arranged along the direction,
The five terminals constituting the first terminal group include a ground terminal located at the center and two signal terminals provided on each of one side and the other side across the ground terminal. These five terminals have a symmetrical structure around the ground terminal,
Each of the five terminals constituting the first terminal group includes a contact portion that can come into contact with a corresponding terminal of the mating connector when fitted to the mating connector, a mounting portion mounted on a substrate, and the contact portion. It has an intermediate part that connects the mounting part, and the contact part extends linearly from the same tip position along the fitting direction with the mating connector toward the mounting part,
The length of the intermediate portion of each of the ground terminal, the signal terminal disposed on the one side close to the ground terminal, and the signal terminal disposed on the other side close to the ground terminal. The length of the intermediate portion in each of the signal terminal arranged on the side far from the ground terminal on the one side and the signal terminal arranged on the side far from the ground terminal on the other side A connector characterized by being set long.   Regarding the partial length of the intermediate portion that extends linearly along the fitting direction with the mating connector in a state of being continuous with the contact portion among the substantially L-shaped intermediate portion in a side view, the ground terminal, The partial length of each of the signal terminal disposed on the side closer to the ground terminal on the one side and the signal terminal disposed on the side closer to the ground terminal on the other side is the one side The signal terminal disposed on the side farther from the ground terminal and the signal terminal disposed on the other side farther from the ground terminal are set to be longer than the respective partial lengths. The connector according to 1.   The connector according to claim 1, wherein a width of the intermediate portion in the pitch direction is wider than that of the contact portion.   4. The connector according to claim 1, wherein impedances of five terminals constituting the first terminal group are in a range of 90 ± 10Ω.   5. The second terminal group according to claim 1, wherein the second terminal groups are arranged in parallel with each other along a pitch direction of the adjacent terminals and along a fitting direction with the mating connector. connector.   The first terminal group is used together with the second terminal group when the connector is used in the USB 3.0 standard, and the second terminal group is used when the connector is used in the USB 2.0 standard. The connector according to claim 1, which is used alone.

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