Electronic device and method for assembling electronic device

1 . An electronic device, comprising:

a screen;

an optical system;

a middle frame configured to accommodate the screen, wherein the middle frame comprises a frame body comprising:

a first frame portion;

a second frame portion; and

a third frame portion coupled to the first frame portion and the second frame portion, wherein the first frame portion and the second frame portion are parallel to each other and perpendicular to the third frame portion, wherein each first frame portion, second frame portion and third frame portion comprises a front frame wall, a rear frame wall, a side frame wall, and a branch wall perpendicular to the front frame wall, disposed so that the optical system is located between the front frame wall and the rear frame wall, wherein an outer side edge of the front frame wall is connected to an outer side edge of the rear frame wall at the side frame wall, wherein the outer side edge of the front frame wall is connected to the branch wall, wherein a front surface of the front frame wall is configured to support the screen, and wherein the branch wall is located on an outer side of an edge of the screen; and

a backboard configured to be assembled with the optical system and comprising:

a side edge comprising a folding edge extending perpendicular to and located between the front frame wall and the rear frame wall, and the folding edge comprising an outer side surface; and

a diaphragm comprising a first part coupled to the outer side surface and a second part located between the front frame wall and the optical system.

2 . The electronic device of claim 1 , wherein the diaphragm further comprises an identifier for delimiting the first part and the second part.

3 . The electronic device of claim 1 , wherein the diaphragm is Mylar.

4 . The electronic device of claim 2 , wherein the diaphragm is Mylar.

5 . The electronic device of claim 1 , wherein the abutting member is foam.

6 . The electronic device of claim 3 , wherein the abutting member is foam.

7 . The electronic device of claim 1 , wherein each of the first frame portion, second frame portion and third frame portion further comprises a connecting wall of the rear frame wall configured to couple to the backboard.

8 . The electronic device of claim 1 , wherein the rear frame wall comprises an inner side edge, and wherein each of the first frame portion, second frame portion and third frame portion further comprises a connecting wall coupled to the inner side edge and configured to couple to the backboard.

9 . The electronic device of claim 5 , wherein the rear frame wall of each of the first frame portion, second frame portion and third frame portion further comprises a connecting wall configured to couple to the backboard.

10 . The electronic device of claim 7 , wherein each of the connecting walls of the first frame portion and the second frame portion comprises a first wall and a second wall, wherein the first wall is coupled to the rear frame wall of a corresponding frame portion at the second wall, wherein a first distance between the first wall and the screen is greater than a second distance between the rear frame wall and the screen, and wherein the first wall is located distal from the side frame wall of the corresponding frame portion relative to the rear frame wall.

11 . The electronic device of claim 7 , wherein the connecting wall of the third frame portion comprises an extending wall extending inwards from the inner side edge of the third frame portion.

12 . The electronic device of claim 1 , wherein the frame body is of an integrally formed structure.

13 . The electronic device of claim 11 , wherein the frame body is of an integrally formed structure.

14 . The electronic device of claim 2 , wherein the frame body is of an integrally formed structure.

15 . The electronic device of claim 1 , further comprising a rear housing, fastened to the frame body, and comprising a second edge that is configured to abut against the rear frame wall.

16 . The electronic device of claim 1 , further comprising a rear housing, fastened to the frame body, and comprising a third edge that is configured to abut against the rear frame wall.

17 . The electronic device of claim 12 , further comprising a rear housing, fastened to the frame body, and comprising a second edge that is configured to abut against the rear frame wall.

18 . A method for assembling an electronic device, comprising:

assembling an optical system of the electronic device and a backboard;

installing the backboard into a frame body from an opening side of the frame body, wherein edges of both the optical system and the backboard are inserted between a front frame wall and a rear frame wall of a corresponding frame portion; fastening the backboard and the rear frame wall with the optical system proximate to the front frame wall and the backboard proximate to the rear frame wall; and

after fastening the backboard and the rear frame wall:

embedding a screen in an area enclosed by branch walls perpendicular to the front frame wall; and

fastening the screen on the on front frame walls of the frame body; and

before assembling the backboard and the frame body, the method further comprises:

providing at least one frame portion with a front facing folding edge;

coupling a first part of a diaphragm to an outer surface of the folding edge; and

pressing the second part of the diaphragm towards the optical system using the front frame wall of the frame portion at a corresponding location.

19 . The electronic device of claim 1 further comprising an abutting member coupled to the second part and configured to face the optical system.

20 . The method of claim 18 , wherein before assembling the backboard and the frame body the method further comprises:

providing at least one frame portion with a front facing folding edge;

coupling a first part of a diaphragm to an outer surface of the folding edge;

providing an elastic abutting member positioned to face the optical system, wherein a second part of the diaphragm is bent towards the optical system abuts against the optical-system; and

pressing the second part of the diaphragm towards the optical system using the front frame wall of the frame portion at a corresponding location.