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US 6,552,532 B1Granted
Displacement detector with relatively movable magnet and sensor
AssigneeNeXT, Inc.
InventorHidetoshi Sako
Life of this patent
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Abstract
A magnetic sensor having a simple structure and high accuracy for detecting a linear or angular displacement thereof. A magnetic plate with tapered thickness is magnetized in a direction perpendicular to its surface. A magnetic sensor is arranged so that it can move in the direction of the taper of the plate thickness. A drive mechanism for this magnetic sensor is movable with an object to be detected, and the output of the magnetic sensor indicates the displacement.
Claims11
A displacement detector, comprising:
- a permanent-magnet magnetic plate having a thickness which changes along a line on the surface of the magnetic plate, the magnetic plate being magnetized in its thickness direction;
- a magnetic sensor disposed near a surface of the magnetic plate so as to be movable in accordance with displacement of an object to be detected relative to the magnetic plate along the line on the magnetic plate while keeping a constant distance therebetween;
- and
- a drive mechanism for allowing a relative movement between the magnetic sensor and the magnetic plate, wherein the magnetic sensor outputs a detected signal corresponding to the displacement of the object.
1 more element
Dependencies are inferred from the claim text.