CN210052155U - Interface expansion device for tablet computer - Google Patents

Abstract

The utility model provides an interface extension device for a tablet personal computer, which comprises a shell with an accommodating cavity, a circuit board arranged in the accommodating cavity, and a USB male plug, a MINI DP male plug, an HDMI extension interface and a plurality of USB extension interfaces which are integrally arranged on the circuit board, wherein the USB male plug, the MINI DP male plug, the HDMI extension interface and the plurality of USB extension interfaces are respectively and electrically connected with a signal/data conversion circuit on the circuit board; two through holes for the USB male plug and the MINI DP male plug to extend out are formed in the shell, and jacks are formed in the positions, corresponding to the HDMI expansion interfaces and the USB expansion interfaces, of the shell respectively. When the USB interface device is used, the USB male plug and the MINI DP male plug are respectively connected with the USB female socket of the tablet computer and the MINI DP female socket, so that the tablet computer can be directly connected with display equipment with an HDMI interface, a plurality of devices with USB interfaces can be connected simultaneously, a user does not need to equip different electronic devices with corresponding data lines, and the USB interface device is convenient to carry and use, economical and environment-friendly.

Description

Interface expansion device for tablet computer

Technical Field

The utility model belongs to the technical field of electronic equipment, more specifically say, relate to an interface extension device for panel computer.

Background

A Tablet Personal Computer (Tablet PC) is a portable Personal Computer with a touch screen as a basic input device, and can be applied to business offices such as browsing web pages, looking up papers, using office software, and the like, and can also be applied to leisure and entertainment such as playing games, surfing the internet, watching videos, and the like. Currently, as the design of the tablet computer is continuously developed towards the direction of lightness, thinness and smaller size of the body, only a small number of small interfaces can be reserved on the body of the tablet computer. For example, the body of a Surface Pro tablet computer released by Microsoft (Microsoft) is usually only adjacently provided with one USB female socket and one MINI DP female socket, which results in that the tablet computer cannot be directly connected to a display or an electronic device having an HDMI interface, and at the same time, the tablet computer cannot simultaneously use a plurality of devices (a USB mouse, a USB keyboard, a USB storage device, etc.) having USB interfaces, thereby bringing great limitations to the use of the tablet computer, and being difficult to meet the increasing demands of people for multiple functions and diversification of products. Aiming at the problem, a user needs to be provided with a plurality of different data patch cords, so that the cost is high, the use is inconvenient, and the data patch cords are easy to lose.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an interface extension device for panel computer aims at solving the data interface quantity of the panel computer that exists among the prior art too little, leads to the user to need be equipped with multiple different data patch cords, causes awkward problem.

In order to achieve the above object, the present invention provides an interface expansion device for a tablet pc, including a housing having a receiving cavity, a circuit board disposed in the receiving cavity, and a signal/data conversion circuit disposed on the circuit board; the interface extension device for the tablet personal computer further comprises a USB male plug, a MINI DP male plug, an HDMI extension interface and a plurality of USB extension interfaces, wherein the USB male plug is used for being in matched connection with a USB female socket of the tablet personal computer, the MINI DP male plug is used for being in matched connection with a MINI DP female socket of the tablet personal computer, the HDMI extension interfaces and the plurality of USB extension interfaces are respectively supported and fixed on the circuit board, and the USB male plug, the MINI DP male plug, the HDMI extension interfaces and the plurality of USB extension interfaces are respectively and electrically connected with the signal/data conversion circuit; two through holes for the USB male plug and one end of the MINI DP male plug, which is far away from the circuit board, to extend out are formed in the shell, and jacks are formed in the positions, corresponding to the HDMI expansion interfaces and the USB expansion interfaces, on the shell; the HDMI expansion interface and the plurality of USB expansion interfaces, the USB male plug and the MINI DP male plug are positioned on different side surfaces of the shell; the USB male plug and the MINI DP male plug are positioned on the same side face of the shell, and the distance between the USB male plug and the MINI DP male plug is equal to the distance between the USB female socket and the MINIDP female socket.

Furthermore, a boss for fixedly mounting the USB male plug and the MINI DP male plug is convexly arranged outward on the housing, the two through holes are respectively formed in the boss, and one ends of the USB male plug and the MINI DP male plug, which are far away from the circuit board, respectively penetrate through the corresponding through holes to extend to the outside of the housing.

Furthermore, a card reader expansion interface is further arranged on the shell, the card reader expansion interface is supported and fixed on the circuit board, and the card reader expansion interface is electrically connected with the signal/data conversion circuit.

Further, the card reader expansion interface comprises a TF card interface and an SD card interface.

Furthermore, a DP expansion interface is further arranged on the shell, the DP expansion interface is supported and fixed on the circuit board, and the DP expansion interface is electrically connected with the signal/data conversion circuit.

Further, the DP extension interface employs a MINI DP interface.

Further, the shell comprises a shell body with an opening and a cover body covering the opening, a plurality of clamping pieces are arranged on the cover body, clamping hooks are arranged at one ends, far away from the cover body, of the clamping pieces, and a plurality of clamping grooves are formed in the inner side wall of the shell body, are used for being matched with the clamping hooks respectively to fix the cover body on the shell body.

Furthermore, still be equipped with on the inside wall of casing and be used for the location the lid in the reference column of position on the casing, be equipped with on the lid and be used for the cooperation joint the location buckle of reference column.

Furthermore, the shell comprises a folded edge plate and two panels formed by respectively bending two sides of the folded edge plate, the panels are located on the same side of the folded edge plate, the two panels and the folded edge plate are enclosed to form the containing cavity, and a positioning column is arranged between the two panels.

Further, the cover body comprises a strip-shaped side plate and two side covers formed by bending two ends of the side plate respectively, sliding rails are arranged on the side covers respectively, and sliding grooves matched with the corresponding sliding rails are arranged on the panels.

The utility model provides an interface extension device for panel computer's beneficial effect lies in: compared with the prior art, the utility model provides an interface extension device for panel computer sets up the circuit board that has signal/data conversion circuit in the holding intracavity of shell to through the circuit board with public plug of USB, the public plug of MINIDP, HDMI extended interface and a plurality of USB extended interface integrated on the shell. When the USB interface device is used, the USB male plug and the MINI DP male plug are respectively connected with the USB female socket and the MINI DP female socket of the tablet computer, so that the tablet computer can be directly connected with display equipment with an HDMI interface, and can be simultaneously connected with a plurality of equipment (a USB mouse, a USB keyboard, USB storage equipment and the like) with USB interfaces, therefore, a user does not need to equip different electronic equipment with corresponding data lines, the USB interface device is convenient to use, economic and environment-friendly, and the USB interface device is particularly suitable for data interface expansion of an ultrathin tablet computer.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic perspective view of an interface expansion device for a tablet computer according to an embodiment of the present invention;

fig. 2 is a schematic side view of an interface expansion apparatus for a tablet computer according to an embodiment of the present invention;

fig. 3 is a schematic side view of an interface expansion apparatus for a tablet computer according to an embodiment of the present invention;

fig. 4 is an exploded schematic view of an interface expansion apparatus for a tablet computer according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an interface expansion device for a tablet computer and a tablet computer used in cooperation with the interface expansion device according to an embodiment of the present invention.

Wherein, the first main mark of each figure in the figure:

1-a housing; 11-a housing chamber; 12-a through hole; 13-a boss; 14-a housing; 141-hemming plates; 142-a panel;

15-a cover body; 150-side plate; 151-positioning fastener; 152-side cover; 153-a slide rail; 16-a clip; 161-

A hook is clamped; 17-a card slot; 18-a chute; 19-a locating post;

2-a circuit board; 3-a tablet computer; 31-USB female socket; 32-MINI DP female socket;

4-USB male plug; 5-MINI DP male plug; 6-HDMI expansion interface; 7-USB expansion interface;

8-card reader extension interface; 81-TF card interface; 82-SD card interface; 9-DP extension interface.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "connected" or "disposed" to another element, it can be directly on the other element or be indirectly connected to the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1 to fig. 5, an interface expansion device for a tablet computer according to an embodiment of the present invention will now be described. The utility model provides an interface extension device for panel computer, including shell 1 that has holding chamber 11, set up circuit board 2 in holding chamber 11, set up the signal/data conversion circuit on circuit board 2, a public plug 4 of USB that is used for cooperating with the female socket 31 of USB of panel computer 3 and is connected, a public plug 5 of MINI DP that is used for cooperating with the female socket 32 of MINI DP of panel computer 3 and is connected, HDMI extension interface 6 and a plurality of USB extension interface 7 support respectively and are fixed in on circuit board 2, the public plug 4 of USB, the public plug 5 of MINI DP, HDMI extension interface 6 and a plurality of USB extension interface 7 link to each other with signal/data conversion circuit electrical property respectively; two through holes 12 are arranged on the shell 1, and are respectively used for extending out of one ends of the USB male plug 4 and the MINI DP male plug 5 which are far away from the circuit board 2, and jacks are respectively arranged on the shell 1 corresponding to the HDMI expansion interface 6 and the USB expansion interfaces 7; the HDMI expansion interface 6 and the USB expansion interfaces 7, the USB male plug 4 and the MINIDP male plug 5 are positioned on different side surfaces of the shell 1; the male plug 4 of USB and the male plug 5 of MINI DP lie in the same side of outer cover 1, and the interval between male plug 4 of USB and the male plug 5 of MINI DP is equal with the interval between female socket 31 of USB and the female socket 32 of MINI DP.

The utility model provides an interface extension device for panel computer compares with prior art, through set up circuit board 2 that has signal/data conversion circuit in the holding chamber 11 at shell 1 to integrate USB public plug 4, MINIDP public plug 5, HDMI extended interface 6 and a plurality of USB extended interface 7 on shell 1 through circuit board 2. When the USB interface device is used, the USB male plug 4 and the MINI DP male plug 5 are respectively connected with the USB female socket 31 and the MINI DP female socket 32 of the tablet computer 3, so that the tablet computer 3 can be directly connected with display equipment with an HDMI interface, and can be simultaneously connected with a plurality of equipment (a USB mouse, a USB keyboard, a USB storage device and the like) with USB interfaces, therefore, a user does not need to be provided with corresponding data lines for different electronic equipment, the carrying and the use are convenient, the USB interface device is economic and environment-friendly, and the USB interface device is particularly suitable for the expansion of data interfaces of the ultrathin tablet computer 3.

Preferably, the USB male plug 4 is a USB3.0 male plug, and the USB expansion interfaces 7 are USB3.0 interfaces. Preferably, the circuit board 2 is a PCB board.

Preferably, the embodiment of the present invention provides an interface extension device for a tablet computer, which adjacently sets a USB male plug 4 and a MINI DP male plug 5 on the same side of a housing 14, and equals the distance between the USB male plug 4 and the MINI DP male plug 5 and the distance between the USB female socket 31 and the MINI DP female socket 32, so that the USB male plug 4 and the MINI DP male plug 5 of the interface extension device of the tablet computer 3 are conveniently plugged into the USB female socket 31 and the MINI DP female socket 32 of the tablet computer 3, and when the user is connected to an external display device, the user can also use devices (USB mouse, USB keyboard, USB storage device, etc.) with multiple USB interfaces at the same time, thereby facilitating business office or entertainment.

Specifically, for example, in order that the interface extension apparatus for a tablet pc conveniently extends the data interface of the Surface Pro tablet pc 3, the distance between the USB male plug 4 and the MINI DP male plug 5 is 12.45cm, so that the gap between the USB male plug 4 and the MINI DP male plug 5 is exclusively the use gap of the Surface Pro tablet pc 3.

Further, please refer to fig. 1, fig. 2 and fig. 5 together, as a specific implementation manner of the interface expansion apparatus for a tablet computer provided in the embodiment of the present invention, a boss 13 for fixedly mounting the USB male plug 4 and the MINI DP male plug 5 is convexly disposed on the housing 1, two through holes 12 are respectively disposed on the boss 13, and one end of the USB male plug 4 and the MINI DP male plug 5 far away from the circuit board 2 respectively passes through the corresponding through hole 12 and extends to the outside of the housing 1.

In this embodiment, a boss 13 is convexly disposed on the housing 1, and through holes 12 are respectively disposed on the boss 13 corresponding to the positions of the USB male plug 4 and the MINI DP male plug 5, so as to respectively mount the USB male plug 4 and the MINI DP male plug 5 on the boss 13, thereby enhancing the mounting stability of the USB male plug 4 and the MINI DP male plug 5. And, the design of boss 13 is adopted to the position that corresponds public plug 4 of USB and the public plug 5 of MINIDP on shell 1, makes panel computer 3 when the cover has the protective sheath, need not pull down the protective sheath, directly carries out thickness compensation to the separation distance of protective sheath thickness through boss 13, and can not restrict the grafting use of public plug 4 of USB and the public plug 5 of MINIDP because of the influence of protective sheath, simple structure, convenient and practical.

Further, please refer to fig. 1, fig. 3 and fig. 4 together, as a specific implementation manner of the interface expansion device for a tablet computer provided in the embodiment of the present invention, a card reader expansion interface 8 is further disposed on the housing 1, the card reader expansion interface 8 is supported and fixed on the circuit board 2, and the card reader expansion interface 8 is electrically connected with the signal/data conversion circuit.

In this embodiment, the card reader expansion interface 8 is integrally disposed on the circuit board 2, so that the tablet pc 3 can access data information through the card reader expansion interface 8 and the mobile medium.

Preferably, please refer to fig. 1 and fig. 3 together, as a specific implementation manner of the interface expansion apparatus for a tablet computer provided in the embodiment of the present invention, the card reader expansion interface 8 includes a TF card interface 81 and an SD card interface 82, so as to facilitate the data information access between the tablet computer 3 and the TF card and the SD card, and enable the tablet computer 3 to have a connection expansion function of supporting reading and writing of an SD memory card and a MicroSD card.

Further, please refer to fig. 1 and fig. 3 together, as a specific implementation manner of the interface expansion device for a tablet computer provided in the embodiment of the present invention, a DP expansion interface 9 is further disposed on the housing 1, the DP expansion interface 9 is supported and fixed on the circuit board 2, and the DP expansion interface 9 is electrically connected to the signal/data conversion circuit.

In this embodiment, the DP extension interface 9 is integrally provided on the circuit board 2, so that the tablet pc 3 outputs a video signal through the DP extension interface 9, and the tablet pc 3 supports an external extension video, thereby adapting to video communication transmission between the tablet pc 3 and display devices having a DP display interface, such as a high-resolution projector, a display, and an intelligent television, and enhancing the versatility of the interface extension apparatus for the tablet pc. Display devices include, but are not limited to, high-resolution projectors, displays, and smart televisions, among others.

Preferably, the DP extension interface 9 can also be replaced by a MINI DP interface to support converting the DP video signal output by the Surface Pro tablet 3 into 2 kinds of video signals (MINI DP video and HDMI video signal), and converting the USB3.0 signal of the Surface Pro tablet 3 into 2 channels of USB3.0, SD card reader and Micro SD card reader.

Further, please refer to fig. 4 together, as a specific implementation manner of the interface expansion apparatus for a tablet computer provided in the embodiment of the present invention, the housing 1 includes a housing 14 with an opening and a cover 15 covering the opening, the cover 15 is provided with a plurality of clamping members 16, one end of each clamping member 16 away from the cover 15 is provided with a hook 161, and the inner side wall of the housing 14 is provided with a plurality of slots 17 for respectively cooperating with the hooks 161 to fix the cover 15 on the housing 14.

In this embodiment, the housing 1 includes a housing 14 with an opening and a cover 15 covering the opening, the boss 13 is disposed on the cover 15, the cover 15 is provided with a plurality of fastening members 16 having fastening hooks 161, and the inner side wall of the housing 14 is provided with a plurality of slots 17 for respectively cooperating with the fastening hooks 161, so that the cover 15 is fixed to the plurality of slots 17 on the housing 14 through the fastening structure of the fastening hooks 161 and the slots 17, thereby facilitating the assembly of the housing 1 and improving the production and assembly efficiency of the interface expansion device for the tablet computer.

Further, please refer to fig. 4 together, as a specific implementation manner of the interface expanding device for a tablet computer according to an embodiment of the present invention, a positioning column 19 for positioning the cover 15 on the housing 14 is further disposed on the inner side wall of the housing 14, and a positioning buckle 51 for engaging with the positioning column 19 is disposed on the cover 15.

Preferably, the housing 14 and the cover 15 of the housing 1 are made of aluminum, and the positioning posts 19 are aluminum ribs made of aluminum, so as to improve the strength of the housing 1 and avoid deformation.

In this embodiment, the positioning column 19 for supporting the casing 14 is disposed in the accommodating cavity 11, so that the casing 14 is structurally balanced in stress, and the casing 1 is kept from deforming. And, be equipped with on lid 15 with the cooperation buckle 151 of fixing a position post 19, through the cooperation of reference post 19 with buckle 151, improve the location equipment effect between lid 15 and the casing 14.

Further, please refer to fig. 4 together, as a specific implementation manner of the interface expanding device for a tablet computer provided in the embodiment of the present invention, the housing 14 includes a folded plate 141 and two panels 142 formed by respectively bending two sides of the folded plate 141, the two panels 142 are located on the same side of the folded plate 141, the two panels 142 and the folded plate 141 enclose to form the accommodating cavity 11, and a positioning column 19 is disposed between the two panels 142.

In this embodiment, the housing 14 includes a panel 142, a folded plate 141 formed by bending one side of the panel 142 upward, and a panel 142 connected to the folded plate 141, one side of the two panels 142 is integrally formed on the same side of the folded plate 141, so that the two panels 142 and the folded plate 141 enclose the accommodating cavity 11, the circuit board 2 integrated with a plurality of data interfaces is placed in the accommodating cavity 11, and then the panel 142 and the panel 142 of the housing 14 are supported and positioned by the positioning column 19, so as to prevent the housing 14 from expanding outward or deforming inward during assembly, enhance the anti-extrusion strength of the housing 14, and improve the stability of the housing 14.

Further, please refer to fig. 4 together, as a specific implementation manner of the interface expanding device for a tablet computer according to an embodiment of the present invention, the cover body 15 includes a strip-shaped side plate 150 and two side covers 152 formed by bending two ends of the side plate 150 respectively, each side cover 152 is provided with a sliding rail 153, and each panel 142 is provided with a sliding slot 18 engaged with the corresponding sliding rail 153.

In this embodiment, the two ends of the long side plate 150 of the cover 15 in the length direction are respectively bent from the ends thereof toward the direction of the folded plate 141 to form side covers 152, the side covers 152 are respectively provided with slide rails 153, the panel 142 is respectively provided with slide grooves 18 engaged with the corresponding slide rails 153, and the positioning and assembling efficiency of the cover 15 and the housing 14 is improved by the sliding engagement of the slide rails 153 and the corresponding slide grooves 18.

The utility model provides a basic operating principle for interface extension device of panel computer is as follows: by integrally providing a signal/data conversion circuit on the circuit board 2 (the signal/data conversion circuit is implemented by using a conventional circuit structure known to those skilled in the art, and will not be described herein), the signal/data conversion circuit supports a function of outputting a MINI DP + HDMI video and USB3.0+ SD + Micro SD data to each other, and a working power supply and a MINI DP video signal of a video portion of the signal/data conversion circuit are provided by a MINI DP port. As long as one interface is accessed in the HDMI or MINI DP interface, the display equipment can transmit EDID information of the HDMI or MINI DP interface to the Surface Pro tablet computer 3 through the video chip, and when receiving the EDID signal, the display equipment can transmit corresponding resolution and audio signals according to the requirement of the display and then distribute the signals to the corresponding display through the video chip; in the USB3.0Hub interface, when equipment is inserted, PID information of the equipment is connected to a PC Host through a USB Hub chip for identification, and a data signal is released to the USB Hub chip for bridging; the SD card and the Micro SD card convert data into USB3.0 signals through reading and writing a storage card chip and send the signals to a USB Hub chip, when equipment is inserted, PID information of the equipment is connected to a PChost through the USB Hub chip for identification, and data signals are released to the USB Hub chip for bridging to realize data reading and writing. Therefore, the utility model provides an interface extension device for panel computer can support MINI DP + USB3.0TO USB3.0+ 2+ SD + Micro SD output, every functional module can the exclusive use, overcome traditional panel computer 3 when the business is gone out to carry the use, incompatible problem between the data interface of fuselage data interface less and data interface and other electronic equipment appears, thereby panel computer 3's data port function has been expanded, make panel computer 3 can use a plurality of electronic equipment that have USB data interface simultaneously, and support SD card and the Micro SD card that the market is commonly used, realize multi-functional integration simultaneously.

Wherein, MINI DP is an english abbreviation of MINI DisplayPort, HDMI is an abbreviation of High Definition Multimedia Interface (english High Definition Multimedia Interface, USB is an abbreviation of english Universal Serial Bus (USB), SD is an abbreviation of Secure Digital Memory Card/SDcard, TF is an abbreviation of Trans-flash Card (original name MicroSD Card), and PCB is an abbreviation of Printed Circuit Board (PCB).

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. An interface expansion device for a tablet computer comprises a shell with an accommodating cavity, a circuit board arranged in the accommodating cavity and a signal/data conversion circuit arranged on the circuit board; the method is characterized in that: the interface extension device for the tablet personal computer further comprises a USB male plug, a MINI DP male plug, an HDMI extension interface and a plurality of USB extension interfaces, wherein the USB male plug is used for being in matched connection with a USB female socket of the tablet personal computer, the MINI DP male plug is used for being in matched connection with a MINI DP female socket of the tablet personal computer, the HDMI extension interfaces and the plurality of USB extension interfaces are respectively supported and fixed on the circuit board, and the USB male plug, the MINI DP male plug, the HDMI extension interfaces and the plurality of USB extension interfaces are respectively and electrically connected with the signal/data conversion circuit; two through holes for the USB male plug and one end of the MINI DP male plug, which is far away from the circuit board, to extend out are formed in the shell, and jacks are formed in the positions, corresponding to the HDMI expansion interfaces and the USB expansion interfaces, on the shell; the HDMI expansion interface and the plurality of USB expansion interfaces, the USB male plug and the MINI DP male plug are positioned on different side surfaces of the shell; the USB male plug and the MINI DP male plug are positioned on the same side face of the shell, and the distance between the USB male plug and the MINI DP male plug is equal to the distance between the USB female socket and the MINI DP female socket.

2. The interface extension apparatus for a tablet computer of claim 1, wherein: the shell is convexly provided with bosses fixedly provided with the USB male plug and the MINI DP male plug, the two through holes are respectively formed in the bosses, and one ends, far away from the circuit board, of the USB male plug and the MINI DP male plug respectively penetrate through the corresponding through holes to extend to the outside of the shell.

3. The interface extension apparatus for a tablet computer of claim 1, wherein: the shell is also provided with a card reader expansion interface, the card reader expansion interface is supported and fixed on the circuit board, and the card reader expansion interface is electrically connected with the signal/data conversion circuit.

4. The interface extension apparatus for a tablet computer of claim 3, wherein: the card reader expansion interface comprises a TF card interface and an SD card interface.

5. The interface extension apparatus for a tablet computer of claim 1, wherein: the casing is further provided with a DP expansion interface, the DP expansion interface is supported and fixed on the circuit board, and the DP expansion interface is electrically connected with the signal/data conversion circuit.

6. The interface extension apparatus for a tablet computer of claim 5, wherein: the DP extension interface adopts an MINI DP interface.

7. The interface expansion apparatus for a tablet computer according to any one of claims 1 to 6, wherein: the shell comprises a shell body and a cover body, wherein the shell body is provided with an opening, the cover body covers the opening, a plurality of clamping pieces are arranged on the cover body, one ends, far away from the cover body, of the clamping pieces are provided with clamping hooks, and the inner side wall of the shell body is provided with a plurality of clamping grooves which are used for being matched with the clamping hooks respectively to fix the cover body on the shell body.

8. The interface extension apparatus for a tablet computer of claim 7, wherein: still be equipped with on the inside wall of casing and be used for the location the lid in the reference column of position on the casing, be equipped with on the lid and be used for the cooperation joint the location buckle of reference column.

9. The interface extension apparatus for a tablet computer of claim 7, wherein: the shell comprises a flanging plate and two panels formed by respectively bending two sides of the flanging plate, the two panels are located on the same side of the flanging plate, the two panels and the flanging plate are enclosed to form the containing cavity, and a positioning column is arranged between the two panels.

10. The interface extension apparatus for a tablet computer of claim 9, wherein: the cover body comprises a strip-shaped side plate and two side covers formed by bending two ends of the side plate respectively, sliding rails are arranged on the side covers respectively, and sliding grooves matched with the corresponding sliding rails are arranged on the panels.

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