Digital displacement sensor with zigzag coils
AssigneeHitachi, Ltd.
InventorsHideo Fujiwara, Yukio Ichinose, Kazuo Ichino, Isamu Orita, Yasutaro Uesaka, Michiyasu Itoh, Hisashi Thuruoka
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Abstract
A digital displacement sensor includes a plurality of zigzag coils provided with projecting or convex portions having different pitches and arranged on the surface of a flat plate. A magnetic head consisting of a magnetic body and a coil is wound around part of the magnetic body, the magnetic head being supported so as to be moved, while maintaining a given gap from the surface of the flat plate, whereby a digital signal corresponding to the displacement of the magnetic head is sensed by means of a plurality of zigzag coils.
Claims12
A digital displacement sensor comprising:
- a substantially flat plate made of magnetic material;
- a plurality of sensing coils disposed adjacent one another on said plate, each coil having alternate concave and convex portions, the pitches of the alternate concave and convex portions of adjacent sections of each coil differing from those of adjacent coils;
- and
- a moving element displaceable in a direction parallel to said sensing coils and including a magnetic head, an edge of which is positioned adjacent to but spaced apart from said coils, and a coil wound around said head which is supplied with a high frequency current.
Dependencies are inferred from the claim text.