| 摘要 |
A method of obtaining positional information utilising a device (10) comprising a first member (11) having at least two electrically isolated conducting parts (13-16), and a second electrically conducting member (12) adjacent to and capacitively coupled to the first member (11), the first and second members (11, 12) being relatively movable such that the proportions of the respective parts (13-16) of the first member (11) in overlapping relationship with the second member (12) may be varied, the method comprising the steps of providing a first square waveform signal (26) to one of the parts (13-16) of the first member (11) and a second square waveform signal (27) to the other of the parts (13-16) of the first member (11), analysing a signal arising in the capacitively coupled second member (12) to obtain a device output signal (50) containing information about the relative positions of the first and second members (11, 12). |
