Key structure and mode switching method thereof

The invention provides a key structure and a mode switching method thereof. The key structure comprises a circuit board, a film layer, a positioning frame, an induction module, scissor feet and a keycap. The film layer is arranged on the circuit board and is electrically connected with the circuit board. The positioning frame is arranged on the film layer. The induction module is arranged on thefilm layer and is electrically connected with the circuit board. The scissor feet are connected to the positioning frame and suitable for ascending or descending relative to the positioning frame. Thekey cap is detachably arranged on the scissors feet and is spaced from the positioning frame. The keycap has a reflective surface and a shaft member. The reflective surface faces the film layer, andthe shaft member extends from the reflective surface and penetrates the scissor feet and the positioning frame so as to be abutted against the film layer. The induction module is opposite to the reflective surface. 本发明提供一种按键结构及其