Patent ID: 7944215
Filing Date: 2011-05-17
Classification: G01D

Abstract:
1. A detector device for measuring the position of a first body relative to a second body along an axis comprising: a first body which comprises an electrical intermediate device; said first body further comprising a touch panel which deflects under the influence of a user's touch in order to displace said electrical intermediate device; a second body which comprises at least two inductors energized with an alternating current; at least one of which is formed by a planar spiral winding on a printed circuit board whose plane is substantially normal to a measurement axis; and at least one of which is a reference component that is not located on said measurement axis: arranged such that displacement of the electrical intermediate device causes a change in inductance of the planar spiral winding and whereby the ratio of the inductances indicates the position of the first body relative to the second; wherein the detector is controlled by an electronics circuit which comprises a power supply, a generator circuit, a measurement circuit, a processor, non-volatile memory and an electrical output; and wherein said electronics circuit comprises said reference component.