Electronic device

1. An electronic device comprising:

a motherboard with a first socket;

a riser card plugged into the first socket of the motherboard, the riser card comprising a first surface with at least one second socket formed thereon for connecting at least one expansion card; and

a securing structure configured for securing the at least one expansion card, the securing structure comprising:

a first fixing plate arranged on the first surface of the riser card, the first fixing plate comprising a plurality of first latching portions corresponding to each second socket, the plurality of first latching portions corresponding to one second socket being arranged on a line substantially parallel to the corresponding second socket;

a second fixing plate arranged facing the first surface of the riser card, the second fixing plate comprising a second latching portion corresponding to each first latching portion of the first fixing plate, the second latching portions corresponding to one second socket being arranged on a line substantially parallel to the corresponding socket; and

at least one fixing member configured for fixing the at least one expansion card, each fixing member comprising a first end portion latchable with each first latching portion, and a second end portion latchable with each second latching portion.

2. The electronic device as claimed in claim 1 , wherein the second socket is elongated, and is parallel to the motherboard.

3. The electronic device as claimed in claim 2 , wherein the riser card comprises a plurality of second sockets, and the distances from these second sockets to the motherboard are different.

4. The electronic device as claimed in claim 2 , wherein the distance from the first latching portion to the motherboard is substantially equal to the distance from the corresponding second socket to the motherboard.

5. The electronic device as claimed in claim 1 , wherein the first latching portions are located at a same side of the corresponding second socket.

6. The electronic device as claimed in claim 2 , wherein the distance from the second latching portion to the motherboard is substantially equal to the distance from the corresponding second socket to the motherboard.

7. The electronic device as claimed in claim 1 , wherein the fixing member defines a latching slot for latching with an end of the expansion card.

8. The electronic device as claimed in claim 1 , wherein the first fixing plate is fixed to the motherboard or fixed to the riser card.

9. The electronic device as claimed in claim 1 , wherein the electronic device further comprises a housing, and the housing comprises a bottom plate for fixing the motherboard and a lateral plate substantially perpendicular to the bottom plate.

10. The electronic device as claimed in claim 9 , wherein the second fixing plate is fixed to the lateral plate.

11. The electronic device as claimed in claim 10 , wherein the second fixing plate is integrally formed with the lateral plate as one monolithic piece.

12. The electronic device as claimed in claim 9 , wherein the second fixing plate is the lateral plate.

13. An electronic device comprising:

a motherboard with a first socket;

at least one expansion card;

a riser card plugged into the first socket of the motherboard, the riser card comprising a first surface with at least one second socket formed thereon for connecting with the at least one expansion card; and

a securing structure configured for securing the at least one expansion card, the securing structure comprising:

a first fixing plate arranged on the first surface of the riser card, the first fixing plate comprising a plurality of first latching portions corresponding to each second socket, the plurality of first latching portions corresponding to one second socket being arranged on a line substantially parallel to the corresponding second socket;

a second fixing plate arranged facing the first surface of the riser card, the second fixing plate comprising a second latching portion corresponding to each first latching portion of the first fixing plate, the second latching portions corresponding to one second socket being arranged on a line substantially parallel to the corresponding socket; and

at least one fixing member configured for fixing the at least one expansion card, each fixing member comprising a first end portion latchable with each first latching portion, and a second end portion latchable with each second latching portion.

14. The electronic device as claimed in claim 13 , wherein the second socket is elongated, and is parallel to motherboard.

15. The electronic device as claimed in claim 13 , wherein the first latching portions are located at a same side of the corresponding second socket.

16. The electronic device as claimed in claim 13 , wherein the first fixing plate is fixed to the motherboard or fixed to the riser card.

17. The electronic device as claimed in claim 13 , wherein the electronic device further comprises a housing, the housing comprises a bottom plate for fixing the motherboard and a lateral plate substantially perpendicular to the bottom plate.

18. The electronic device as claimed in claim 17 , wherein the second fixing plate is fixed to the lateral plate.

19. The electronic device as claimed in claim 18 , wherein the second fixing plate is integrally formed with the lateral plate.

20. The electronic device as claimed in claim 17 , wherein the second fixing plate is the lateral plate.