Keyboard

1. A keyboard, comprising:

a circuit board having an upper surface, a lower surface opposite to the upper surface, a plurality of locking slots, and a plurality of cut-out portions, wherein each locking slot of the plurality of locking slots is located laterally adjacent a corresponding cut-out portion of the plurality of cut-out portions and the plurality of locking slots and the plurality of cut-out portions are coplanar;

a plurality of key modules positioned on the upper surface and over the plurality of cut-out portions, wherein at least a portion of each key module is received in a corresponding locking slot of the circuit board; and

a plurality of light sources installed on the lower surface of the circuit board, wherein at least a portion of at least one light source is positioned in a corresponding cut-out portion.

2. The keyboard of claim 1 , wherein each light source includes a light emitting portion and a connector for connecting the light source to the circuit board.

3. The keyboard of claim 2 , wherein the light emitting portion of the at least one light source is substantially flush with the upper surface of the circuit board.

4. The keyboard of claim 2 , wherein the light emitting portion of the at least one light source protrudes from the upper surface of the circuit board.

5. The keyboard of claim 2 , wherein the light emitting portion of the at least one light source is displaced from the upper surface inside the cut-out portion.

6. The keyboard of claim 2 , wherein each light source is positioned beneath and bounded by a corresponding key module, and the connector is coupled to the lower surface of the circuit board.

7. The keyboard of claim 2 , wherein the upper surface of the circuit board includes a first circuit layer and the lower surface of the circuit board includes a second circuit layer, and the connector is coupled to the second circuit layer.

8. The keyboard of claim 1 , wherein each key module is positioned above and at least bounds the corresponding cut-out portion.

9. The keyboard of claim 1 , wherein

each key module includes a key cap disposed on a key seat, and

the key seat includes a base having a locking portion at a bottom end thereof and received in the corresponding locking slot, and an actuator at a top end thereof and received in the base.

10. The keyboard of claim 1 , wherein the keyboard is a mechanical keyboard.

11. The keyboard of claim 1 , wherein the plurality of light sources include light emitting diodes (LEDs).

12. The keyboard of claim 9 , wherein the plurality of light sources are presented in a direction from the lower surface of the circuit board to the upper surface of the circuit board.

13. A keyboard, comprising:

a circuit board having an upper surface, a lower surface opposite the upper surface, a plurality of locking slots, a plurality of cut-out portions, wherein a first circuit layer is disposed on the upper surface and a second circuit layer is disposed on the lower surface, wherein each locking slot of the plurality of locking slots is located laterally adjacent a corresponding cut-out portion of the plurality of cut-out portions and the plurality of locking slots and the plurality of cut-out portions are coplanar;

a plurality of key modules installed in the upper surface, each key module positioned over a corresponding cut-out portion and covering the cut-out portion entirely, and at least a portion of each key module received in a corresponding locking slot of the circuit board; and

a plurality of light sources, each light source installed on the lower surface and in a corresponding cut-out portion, wherein

each light source includes a light emitting portion and a connector connecting the light source to the second circuit layer, and

at least some of the light emitting portion is disposed in the cut-out portion and is positioned beneath and bounded by the key module.

14. The keyboard of claim 13 , further comprising:

each key module includes a key cap disposed on a key seat, and

the key seat includes a base having a locking portion at a bottom end thereof and received in a corresponding locking slot, and an actuator at a top end thereof and received in the base.

15. The keyboard of claim 14 , wherein the key seat includes a light transmitting material.

16. The keyboard of claim 14 , further comprising a positioning rack disposed over the circuit board and containing a plurality of openings, each opening having the key seat disposed therein.

17. The keyboard of claim 13 , wherein the light emitting portion is substantially flush with the upper surface of the circuit board.

18. The keyboard of claim 13 , wherein the light emitting portion protrudes from the upper surface of the circuit board.

19. The keyboard of claim 13 , wherein the light emitting portion is displaced from the upper surface inside the cut-out portion.