1. Field of the Invention
The present invention generally relates to an electrical connector assembly, and more particularly to an electrical connector assembly including a receptacle connector and a plug connector transmitting high-speed signal.
2. Description of Related Art
Personal computers (PC) are used in a variety of ways for providing input and output. Universal Serial Bus (USB) is a serial bus standard to the PC architecture with a focus on computer telephony interface, consumer and productivity applications. The design of USB is standardized by the USB Implementers Forum (USB-IF), an industry standard body incorporating leading companies from the computer and electronic industries. USB can connect peripherals, such as mouse devices, keyboards, PDAs, gamepads and joysticks, scanners, digital cameras, printers, external storage, networking components, etc. For many devices such as scanners and digital cameras, USB has become the standard connection method. As of 2006, the USB specification was at version 2.0 (with revisions). The USB 2.0 specification was released in April 2000 and was standardized by the USB-IF at the end of 2001. Previous notable releases of the specification were 0.9, 1.0, and 1.1. Equipment conforming to any version of the standard will also work with devices designed to any previous specification (known as: backward compatibility).
USB supports three data rates: 1) A Low Speed rate of up to 1.5 Mbit/s (187.5 KB/s) that is mostly used for Human Interface Devices (HID) such as keyboards, mice, and joysticks; 2) A Full Speed rate of up to 12 Mbit/s (1.5 MB/s); (Full Speed was the fastest rate before the USB 2.0 specification and many devices fall back to Full Speed. Full Speed devices divide the USB bandwidth between them in a first-come first-served basis and it is not uncommon to run out of bandwidth with several isochronous devices. All USB Hubs support Full Speed); 3) A Hi-Speed rate of up to 480 Mbit/s (60 MB/s).
As the development of the electronic devices, under a circumstance transmitting an audio or video file, which is always up to hundreds MB, even to 1 or 2 GB, currently transmission rate of USB is not sufficient. As a consequence, faster serial-bus interfaces are being introduced to address different requirements. PCI Express, at 2.5 GB/s, and SATA, at 1.5 GB/s and 3.0 GB/s, are two examples of High-Speed serial bus interfaces.
However, these non-USB protocols are not used as broadly as USB protocols. Many portable devices are equipped with USB connectors other than these non-USB connectors. One important reason is that these non-USB connectors contain a greater number of signal pins than an existing USB connector and are physically larger as well. Therefore, USB 3.0 interface was published. The existing electrical connector assembly in a mainframe can transmit signals of USB 2.0 connector on a back panel to a main board, but can't transmit high-speed signals of USB 3.0 connector, so the signals between the back panel and the main board can't be transmitted mutually.
Hence, it is desirable to have an improved electrical connector assembly to overcome the above-mentioned disadvantages of the prior art.
Accordingly, the object of the present invention is to provide an electrical connector assembly used for transmitting high-speed signal between a main board and a back panel.
In order to achieve the above-mentioned object, an electrical connector assembly in accordance with the present invention comprises a receptacle connector and a plug connector mating with the receptacle connector. The receptacle connector has a receptacle housing and a plurality of receptacle contacts received in the receptacle housing, and the receptacle housing comprises a base portion and an expansion portion extending outwards from the base portion. The plug connector comprises a plug housing and a plurality of plug contacts retained in the plug housing. Each of the receptacle contacts and the plug contacts define a mating portion, a retention portion retained with associated housing and a tail portion extending beyond the associated housing. The receptacle contacts and the plug contacts are divided into two groups respectively, each group of contacts comprises two pairs of differential signal contacts and a grounding contact arranged between the two pairs of differential signal contacts, and one of the two pairs of differential signal contacts are located on an outer side of the group of contacts.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description of the present embodiment when taken in conjunction with the accompanying drawings.
Reference will now be made to the drawing figures to describe the present invention in detail.
Referring to
The receptacle insulated housing 10 comprises a base portion 102 and an expansion portion 104 extending backwards from the base portion 102. The base portion 102 defines a cavity 1020 recessed backward from a front surface thereof, the cavity 1020 is of n-shape and has a pair of guiding slots 1023 on lateral sides thereof. Two platforms 1021 are formed in the cavity 1020, each platform 1021 defines a plurality of receiving grooves 1025 arranged in juxtaposed manner, a plurality of receiving channels 1026 are defined through walls of the base portion 102 and communicated with corresponding receiving grooves 1025. The expansion portion 104 has an opening 1041 in a back end thereof. A pair of ribs 1028 are disposed in the cavity 1020 along an up-to-down direction.
Referring to
Referring to
The spacer 13 is tabulate and placed along a vertical direction approximately, and the shape of the spacer 13 is same as the opening 1041. The spacer 13 comprises a rectangle plank 131 and a number of bars 132 protruding from an upper surface and a lower surface outwards. Each two neighboring bars 132 is spaced from each other to form a gap 133, the tail portions 124 of the receptacle contacts 12 are supported in the corresponding gaps 133.
In assembling, the receptacle contacts 12 are inserted into the receptacle insulated housing 10 along a back-to-front direction, the first mating portions 121 are accommodated in the receiving grooves 1025 with the top ends exposed on the platforms 1021. The first tip ends 1211 of the first mating portions 121 are located in the receiving channels 1026, and an upper surface of each first tip end 1211 is adjacent to a top surface 1027 of the receiving channel 1026 to prevent the first mating portion 121 jumping out. The first retention portions 123 are held in the receptacle housing 10 via the barbs 1231. The first tail portions 124 of the receptacle contacts 12 extend beyond the receptacle housing 10, and the spacer 13 is assembled in the opening 1041 of the receptacle housing 10, the first tail portions 124 are supported in the gaps 133 and soldered to wires (not shown), then a cover (not shown) is enclosed on the electrical connection.
Referring to
The plug contacts 21 of the plug connector 200 are also divided into a top group and a bottom group, the two groups are opposite to each other and in mirror relationship, but the arrangement orders of the two groups are reversed from each other. Each plug connector group includes nine juxtaposed plug connectors 12 on the same shape, and each plug connector 12 comprises a second mating portion 211 on a front end, a flat second tail portion 214 on a back end and a second retention portion 213 connected with the second mating portion 211 and the second tail portion 214. The second mating portions 211 are received in the passageways 2012. Each second retention portion 213 defines a plurality of barbs 2131 symmetrically. Each second mating portion 211 of the top group of plug contact 21 is extended from a front end of the second retention portion 213 forwards, finally bend downwards to form a second tip end 2110. The second tail portions 214 of the same group of plug contacts 21 are bent to locate on different surfaces.
The top group of plug contacts 21 are numbered as 21a to 21i respectively, and comprises two pairs of second differential signal contacts 21a, 21b, 21d, 21e, two second grounding contacts 21c, 21f (GND), a second positive signal contact 21g (+ data contact), a second negative signal contact 21h (− data contact) and a second power contact 21i. One of the two pairs of the second differential signal contacts 21a, 21b are used for receiving a high-speed data, and another pair 21d, 21e used for sending the high-speed data. The second differential signal contacts 21a, 21d are positive, and the second differential signal contacts 21b, 21e are negative. One of the second grounding contacts 21c is arranged between the two pairs of first differential signal contacts to reduce cross-talk. Another second grounding contact 21f is arranged between the second differential signal contacts 21d, 21e and the second data contacts 21g, 21h for preventing cross-talk. The second power contact 21i is located neighboring to the − data contact 21h and on an outer side of the − data contact 21h. The second tail portions 214 of the second grounding contacts 21c, 21f and the second power contact 21i in the top row are bent downwards, and the others are bent upwards to be in stagger relationship.
When assembly, the plug contacts 21 are inserted into the plug housing 20, the second mating portions 211 are received in the passageways 2012, and the second tip ends 2110 are embedded in the plug housing 20 to prevent the second mating portions 211 jumping out. The second retention portions 213 of the plug contacts 21 are retained in the passages 2013 of the plug housing 20 via the barbs 2131 thereon, the second tail portions 214 of the plug contacts 21 are extending beyond a front surface of the plug housing 20 and soldered to a print circuit board (not shown).
Referring to
Referring to
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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200810304513.6 | Sep 2008 | CN | national |