Patent Document ID: 4879508
Application ID: 07200368
Patent Flag: 1

Claim One:
1. Capacitive-type measuring apparatus comprising: first and second support members, said support members being relatively displaceable with respect to each other, and at least one of said support members being displaceable relative to a measurement axis; an array of first transmitter electrodes disposed on said first support member in alignment with said measurement axis; an array of first receiver electrodes disposed on said second support member in alignment with said measurement axis and such that differing portions of said first receiver electrode array are capacitively coupled with said first transmitter electrode array in dependence on the relative positions of said supporting members; and an array of second transmitter electrodes disposed on said second support member in relative alignment with said first receiver electrode array, each of said second transmitter electrodes being electrically connected to a corresponding one of said first receiver electrodes so as to be offset from the corresponding first receiver electrode by an amount which is a predetermined function of the position of the second transmitter electrode relative to a reference position on said measurement axis.