Slim-type keyboard

A slim-type keyboard, comprising:

• a first flexible layer comprising plural pressed regions;
• a pressed frame disposed under the first flexible layer, wherein the pressed frame comprises plural hollow regions and plural cantilever strips, and the plural cantilever strips are defined by the plural hollow regions, wherein each of the plural cantilever strips comprises a U-shaped groove, a connection end and a suspension end, and the U-shaped groove opens to the suspension end, wherein the plural cantilever strips are covered by the first flexible layer, and the pressed regions are disposed over and aligned with the corresponding cantilever strips, wherein when one of the plural pressed regions is pressed, the corresponding cantilever strip is pushed downwardly;
• a circuit board assembly comprising a circuit board and plural dome switches, wherein the plural dome switches are disposed on the circuit board, and the plural cantilever strips are disposed over and aligned with the corresponding dome switches, wherein when one of the plural cantilever strips is pushed downwardly, the corresponding dome switch is triggered;
• and
• a second flexible layer disposed under the circuit board assembly, wherein a peripheral region of the first flexible layer and a peripheral region of the second flexible layer are attached on each other, an accommodation space is defined by the first flexible layer and the second flexible layer collaboratively, and the pressed frame and the circuit board assembly are accommodated within the accommodation space;
• wherein the circuit board assembly further comprises a supporting plate, and the supporting plate is arranged between the circuit board and the second flexible layer,
• wherein the circuit board comprises a first slot, and the supporting plate comprises a second slot, wherein after the connection end of one of the plural cantilever strips is penetrated downwardly through the first slot and the second slot, the connection end is bent to form a bent structure, wherein the bent structure has a top surface and a bottom surface, the top surface of the bent structure is contacted with the supporting plate, and the bottom surface of the bent structure is contacted with the second flexible layer.