Patent ID: 6522129
Filing Date: 2003-02-18
Classification: G01D

Abstract:
An induction type tranducer outputting an electric signal in accordance with relative displacement between two members, comprising:a magnetic flux generating section for generating a magnetic flux based on a drive signal; a magnetic flux detecting section for detecting the magnetic flux which changes in accordance with the relative displacement, wherein the magnetic flux detecting section has first and second series of linear parallel conductors connected to each other; a signal processing section for processing a detection signal from the magnetic flux detecting section; and a magnetic shield section between the magnetic flux generating section and the signal processing section; wherein the magnetic flux generating section, the magnetic flux detecting section, the signal processing section, and the magnetic shield section are formed at a substrate with a multilayer structure, wherein the substrate has the multilayer structure obtained by building-up a plurality of layers on a core layer with a gap between the magnetic flux generating section and a scale and with a distance between the magnetic flux generating section and the magnetic shield section, and wherein the distance is at least equal to the gap for the magnetic shield section having low magnetic permeability and the gap is at least equal to the distance for the magnetic shield section having high magnetic permeability.