Connection structures of modular assembly system

1. A connection structure, comprising:

two connection interfaces, each connection interface comprising:

a plurality of planar contacts arranged at a center of a circuit board and one or more concentric rings on the circuit board, and

a plurality of first lock mechanisms arranged on a first casing; and

a connector comprising:

a second casing comprising two open ends and a plurality of second lock mechanisms arranged on the second casing; and

a plurality of pins, each pin comprising two ends each exposed by one of the two open ends of the second casing, respectively,

wherein when the connector is plugged into the two connection interfaces at a plurality of orientations relative to one another,

the plurality of pins of the connector are in contact with the plurality of planar contacts of each connection interface so that the two connection interfaces are electrically connected, and

the plurality of second lock mechanisms of the connector are interlocked with the plurality of first lock mechanisms of each connection interface so that the two connection interfaces are mechanically connected.

2. The connection structure of claim 1 , wherein the connector is detachable from each connection interface after being plugged into the two connection interfaces.

3. The connection structure of claim 1 , wherein the plurality of orientations include four orientations with 90 degrees offset.

4. The connection structure of claim 1 , wherein

the first lock mechanisms include an annular edge on one end of a hole on the first casing and a plurality of recesses on the first casing;

the second lock mechanisms include one or more snaps on each annular edge on the two open ends of the second casing and a plurality of protrusions on an outer surface of the second casing; and

when the connector is plugged into the two connection interfaces at the plurality of orientations relative to one another, the snaps of the second lock mechanisms are snapped-fit to the annular edge of the first lock mechanisms, and each protrusion of the second lock mechanisms is inserted into a respective recess of the first lock mechanisms.

5. The connection structure of claim 4 , wherein the number of the plurality of orientations is the same as the number of the plurality of recesses of the first lock mechanisms.

6. The connection structure of claim 1 , wherein

each of the second casing and the hole on the first casings is in a substantially cylindrical shape; and

when the connector is plugged into the two connection interfaces at the plurality of orientations relative to one another, a central axis of the hole on the first casing is aligned with a central axis of the second casing.

7. The connection structure of claim 1 , wherein each pin further includes a spring connected between the two ends.

8. The connection structure of claim 1 , wherein the plurality of planar contacts include:

a center contact arranged at the center on the circuit board; and

a plurality of peripheral contacts separately arranged at the one or more concentric rings on the circuit board.

9. The connection structure of claim 8 , wherein at an outermost ring of the concentric rings,

a first set of peripheral contacts are electrically connected one another by the circuit board, and a second set of peripheral contacts are electrically connected one another by the circuit board; and

the first and second sets of peripheral contacts are electrically separate.

10. The connection structure of claim 9 , wherein at an innermost ring of the concentric rings, all the plurality of peripheral contacts arranged at the innermost ring are electrically connected one another by the circuit board.

11. The connection structure of claim 8 , wherein

the plurality of pins include:

a center pin arranged along a central axis of the second casing; and

a plurality of peripheral pins arranged at one or more concentric rings relative to the central axis of the second casing; and

the number of the plurality of peripheral pins is smaller than the number of the plurality of peripheral contacts.

12. The connection structure of claim 11 , wherein a plurality of peripheral pins that are electrically separate one another are arranged at an outermost ring of the concentric rings relative to the central axis of the second casing.

13. The connection structure of claim 11 ; wherein the plurality of peripheral pins consist of one peripheral pin arranged at an innermost ring of the concentric rings relative to the central axis of the second casing and two peripheral pins that are electrically separate and arranged at an outermost ring of the concentric rings relative to the central axis of the second casing.

14. The connection structure of claim 1 , wherein the plurality of planar contacts include:

a center contact arranged at the center on the circuit board; and

a plurality of ring contacts each arranged at one of the one or more concentric rings on the circuit board.

15. The connection structure of claim 14 , wherein

the plurality of pins include:

a center pin arranged along a central axis of the second casing, and

a plurality of peripheral pins arranged at one or more concentric rings relative to the central axis of the second casing; and

the number of the plurality of ring contacts is the same as the number of the plurality of peripheral pins.

16. A connection structure, comprising:

two connection interfaces, each connection interface comprising:

a plurality of contacts arranged on a circuit board, and

a plurality of first lock mechanisms arranged on a first casing; and

a connector comprising:

a second casing comprising two open ends and a plurality of second lock mechanisms arranged on the second casing, and

a plurality of concentric ring contacts, each concentric ring contact comprising two ends each exposed by one of the two open ends of the second casing, respectively,

wherein when the connector is plugged into the two connection interfaces at a plurality of orientations relative to one another,

the plurality of concentric ring contacts of the connector are in contact with the plurality of contacts of each connection interface so that the two connection interfaces are electrically connected, and

the plurality of second lock mechanisms of the connector are interlocked with the plurality of first lock mechanisms of each connection interface so that the two connection interfaces are mechanically connected.

17. The connection structure of claim 16 , wherein lengths of the plurality of concentric ring contacts of the connector are different.

18. The connection structure of claim 16 , wherein the connection further comprises a center pin arranged at a center of the plurality of concentric ring contacts.

19. The connection structure of claim 16 , wherein at least some of the plurality of contacts of each connection interface are deformable.

20. The connection structure of claim 16 , wherein the connector is detachable from each connection interface after being plugged into the two connection interfaces.

21. The connection structure of claim 16 , wherein

the first lock mechanisms include an annular edge on one end of a hole on the first casing and a plurality of recesses on the first casing;

the second lock mechanisms include one or more snaps on each annular edge on the two open ends of the second casing and a plurality of protrusions on an outer surface of the second casing; and

when the connector is plugged into the two connection interfaces at the plurality of orientations relative to one another, the one or more snaps of the second lock mechanisms are snapped-fit to the annular edge of the first lock mechanisms, and each protrusion of the second lock mechanisms is inserted into a respective recess of the first lock mechanisms.

22. The connection structure of claim 21 , wherein the number of the plurality of orientations is the same as the number of the plurality of recesses on the first casing.

23. The connection structure of claim 16 , wherein

each of the second casing and the hole on the first casing is in a substantially cylindrical shape; and

when the connector is plugged into the two connection interfaces at the plurality of orientations relative to one another, a central axis of the hole on the first casing is aligned with a central axis of the second casing.