Patent ID: 7520426
Filing Date: 2009-04-21
Classification: H03K

Abstract:
1. A position monitoring device for establishing the position of a first part with respect to a second part, the position monitoring device comprising: a transceiver being provided at the first part, a transponder being provided at the second part, the transceiver for emitting an interrogation signal and for receiving a response signal that can be emitted in reaction to the interrogation signal by the transponder, a screen which is adapted to attenuate signals between the transponder and the transceiver corresponding to the relative position of the transceiver at the first part, the transponder at the second part and the screen, wherein two members of the group consisting of the transceiver, the second part and the first part are movable relative to one another, and wherein via the screen a limiting distance between the first and second part is adjustable.