| 摘要 |
A motion sensor device comprises a conductive cap (8) fixed to one layer of a printed circuit board (4) to define a volume half of which is filled with a dielectric liquid (16). A conductive layer on the opposite side of the printed circuit board forms with the cap a capacitor, the capacitance of which is dependent upon the location of the liquid within the cap. A motion signal is generated in response to a change of capacitance from that presented in any static orientation of the device, so long as the capacitance change exceeds a threshold and occurs within a predetermined interval. <IMAGE> |
