Wireless terminal product, through development for many years, has defined form miscellaneous the most, as mobile phone, data card,
Palm intelligent machine etc..Having a universal form in these various forms of products is that it typically can leave interface and computer leads to
Letter, most popular is USB (universal serial bus) (Universal Serial Bus, USB).Particularly for data card, its
Rely primarily on computer power supply, and exchange data with computer, it is achieved data card is powered and the interface USB just of data interaction
Fig. 1 is the structural representation of existing USB plug, sees Fig. 1, and the upper and lower surfaces of USB plug have two respectively
Through hole 11, four shell fragments in the respective socket respectively of the position of these four through holes 11, when USB plug is connected with socket, due to
Four shell fragments of socket top and bottom are just stuck on four holes of plug so that plug is insufficient with the connection of socket.Keeping
When USB normally inserts, it can be ensured that two shell fragments contacting only side of plug and socket.The two contact is high in data
To be easy to occur the phenomenon of port during speed transmission, and, due to insufficient contact, contact impedance can be produced, at high speed number
Produce abundant interference signal during the transmission of word signal, affect the normal work of communication system.
During it addition, USB plug connects with printed circuit board (Printed Circuit Board, PCB), it is by USB plug
On straight cutting leg 12 insert in the jack on PCB.See Fig. 1, exist recessed between side housing and the straight cutting leg of USB plug
Groove 13, due to the existence of this groove 13 so that USB plug can not be fully contacted PCB.Further, existing USB plug connects with PCB
The face touched, sees the contact surface 14 in Fig. 1 and contact surface 15, and these contact surfaces are plastics, and this also makes the USB plug can not be with
PCB good contact.
The above-mentioned design of existing USB plug can make USB plug can not be fully contacted socket and/or PCB, can produce contact
Impedance, produces interference when high-speed digital signal transmits, and affects the normal work of system.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
Fig. 2 is the USB plug structural representation of first embodiment of the invention, and Fig. 3 is that the USB of second embodiment of the invention inserts
Header structure schematic diagram, both view directions are different.
Seeing Fig. 2 or Fig. 3, in order to improve the contact of USB plug and socket, the embodiment of the present invention provides following technology
This USB plug includes metal covering, and the shell fragment position corresponding to socket on described metal covering is provided with obstructed
Saturating metal part 4 so that after described USB plug inserts described socket, described shell fragment connects with described impermeable metal part 4
Further, in order to avoid the deformation of the shell fragment on socket is excessive, this impermeable metal part 4 can be arranged
For metal female.
That is, see Fig. 1, prior art is arranged in the shell fragment position corresponding to socket for through hole 11, and through hole is not
Can guarantee that USB plug is fully contacted with socket.In order to improve the contact of USB plug and socket, the present embodiment leading to script
Hole metal blocks, i.e. see Fig. 2 or 3, and the present embodiment is provided that metal part at original lead to the hole site, it is achieved that
USB plug and the good contact of socket.In order to avoid the deformation of shell fragment is excessive, improving the service life of socket, the present embodiment can
To be arranged to shorter than the metal covering of surrounding by this metal part 4, i.e. it is arranged to concave shape.
The present embodiment is by being arranged to metal part, so that USB plug is abundant with socket by throughhole portions originally
Contact, it is to avoid the interference problem that loose contact causes.
Seeing Fig. 2 or Fig. 3, in order to improve the contact of USB plug and PCB, the embodiment of the present invention provides following technology
This USB plug meets at least one in following condition: with the metal shell that described straight cutting leg is positioned at the same side
Completely attach to described PCB when described USB plug is connected with PCB；The face contacted with described PCB in described USB plug is gold
Specifically, see Fig. 1, prior art is positioned on the metal shell of the same side with straight cutting leg in USB plug and deposits
At a groove 13, due to the existence of this groove so that USB plug can not fully be connected with PCB.The present embodiment so that
USB plug is fully connected with PCB, is extended by the metal of the position of groove 13 originally so that this metal shell is at described USB
Completely attach to described PCB when plug is connected with PCB.That is, Fig. 2 or 3 is seen, being carried out by groove part originally of the present embodiment
Prolonged treatment so that the height of the metal shell 1 of groove part is complete with described PCB when described USB plug is connected with PCB originally
Full connected, for example, with reference to Fig. 1, the height of the little plastics in the inner of height of groove part 13 originally；And the embodiment of the present invention
In, seeing Fig. 2 or 3, groove part 1 is extended, height waits the height of plastics in the inner, so in USB plug with PCB even
Can completely attach to PCB when connecing.
Furthermore, contact surface originally can be set to metal by the present embodiment, i.e. sees Fig. 2, by USB plug with PCB
Contact surface 2 and contact surface 3 be set to metal covering.
The present embodiment is by extending groove part originally, and/or contact surface is arranged to metal covering, so that
USB plug is fully contacted with PCB, it is to avoid the interference problem that loose contact causes.
The above-mentioned scene being respectively directed in socket and PCB connect is described, it is to be understood that to USB plug
Improvement can be in conjunction with above two scene.
Above-mentioned design can improve contacting of USB plug and socket or PCB.In order to improve interference further, permissible
Suppression circuit is set in the pcb.
Fig. 4 is the PCB construction schematic diagram of third embodiment of the invention, sees Fig. 4, and the PCB of the present embodiment includes suppression
Circuit, for suppressing the harmonic wave of USB data transmission.
Seeing Fig. 4, the voltage of USB plug input PCB includes D+ and D-(shown on the left of Fig. 4), in prior art, this D+ and
The element that D-is supplied directly on PCB uses (shown on the right side of Fig. 4).The present embodiment, in order to suppress interference, adds as shown in Figure 4
The suppression circuit being made up of electric capacity and inductance.
When the data of USB2.0 can be transmitted by the suppression circuit in the present embodiment, the harmonic wave of 960MHz suppresses, and reduces
The radiation of USB interference signal.
Specifically, seeing Fig. 4, the suppression circuit of the present embodiment includes being connected to and the first voltage (D of USB plug input
+) the first electric capacity 41 and the first inductance 42 on corresponding pressure-wire, this first electric capacity 41 and the first inductance 42 are in parallel；It is connected to
Second electric capacity 43 and second inductance 44 pressure-wire on corresponding with second voltage (D-) of USB plug input, this second electric capacity
43 and second inductance 44 in parallel.First electric capacity 41 of this parallel connection and one end of the first inductance 42 are connected with the 3rd electric capacity 45, and this is years old
One end of three electric capacity 45 is connected on the pressure-wire corresponding with the first voltage, other end ground connection；First electric capacity 41 He of this parallel connection
The other end of the first inductance 42 is as the input of the first voltage needed for element on PCB.Second electric capacity 43 and second of this parallel connection
One end of inductance 44 is connected with the 4th electric capacity 46, and one end of the 4th electric capacity 46 is connected to the pressure-wire corresponding with the second voltage
On, other end ground connection；Second electric capacity 43 of this parallel connection and the other end of the second inductance 44 are as the second voltage needed for element on PCB
The present embodiment, by arranging suppression circuit, can carry out trap process to interference signal, filter out interference signal, carry
The reliability of high system.
USB device is obtained it is understood that above-mentioned USB plug can be welded on PCB, wherein, this USB plug
Can be for the USB plug shown in Fig. 2 or 3, this PCB can be for the PCB shown in Fig. 4.This USB device can be data card, flash disk
It is understood that the correlated characteristic in said method and equipment can mutually reference.It addition, in above-described embodiment
" first ", " second " etc. be for distinguishing each embodiment, and do not represent the quality of each embodiment.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although
With reference to previous embodiment, the present invention is described in detail, it will be understood by those within the art that: it still may be used
So that the technical scheme described in foregoing embodiments to be modified, or wherein portion of techniques feature is carried out equivalent；
And these amendment or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and