Patent ID: 7973528

Claim:
A sensor device for detecting a relative movement, comprising: a transmitter unit configured to generate a field, the transmitter unit comprising: first transmitter elements; and second transmitter elements, wherein the first transmitter elements and the second transmitter elements, configured to generate a spatially varying field, are arranged alternately one behind another along a line at predetermined positions, and wherein at a reference position, which corresponds to at least one of the predetermined positions of a first or second transmitter element along the line, at least one value of the field is altered by a positive factor with respect to a corresponding other position of a first or second transmitter element; a pick-up unit configured to generate an alternating output signal depending on the field generated by the first and second transmitter elements, wherein the transmitter unit and the pick-up unit can be moved relative to one another; and an attenuation unit at the reference position configured to attenuate the field and formed as a coating.