Patent ID: 7907130

Claim:
An x-y position sensor comprising: first and second members which are relatively movable over an x-y planar working area; the first member comprising a circuit board that lies in an x-y plane that is substantially parallel to said planar working area, the circuit board carrying a plurality of conductor tracks that define one or more coils that lie in said x-y plane; the first member further comprising a coil that lies in at least one plane that is inclined to the x-y plane of said circuit board; and the second member comprising an electromagnetic device operable to electromagnetically couple with said one or more coils that lie in said x-y plane of the circuit board and to electromagnetically couple with said coil that lies in at least one plane that is inclined to the x-y plane of the circuit board, to generate sensor signals that vary with the relative position of the first and second members.