Two-stage switch using capacitance sensor and mechanical contactor switch

A two-stage switch using a capacitance sensor and a mechanical contact switch is provided to reduce the size of key pads by performing the same function with a conventional method with small area and button number. A two-stage switch using a capacitance sensor and a mechanical contact switch includes a PCB(Printed Circuit Board)(160). A conductive dome type pushing plate(140) is installed on the PCB. A first conductive PCB pattern(150a) is sandwiched between the PCB and the conductive dome type pushing plate. A second PCB pattern(150b) is installed on the PCB to position at a place where the conductive dome type pushing plate is lifted. A static capacitive sensor(180) is connected to the first conductive PCB pattern through a static capacitive sensor sensing line(H). A dome switch output line(G) is connected to the first conductive PCB pattern. A timing controller(170) uses the dome switch output line and the static capacitive sensor sensing line in a time divisional method.