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US 5,512,822 AGranted
Magnetic sensor with member having magnetic contour antisotropy
AssigneeMurata Mfg. Co., Ltd.
InventorNoboru Masuda
Life of this patent
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Abstract
A magnetic sensor includes a member having a magnetic contour anisotropy. A counterpart yoke is disposed above a magnet. The thickness of the counterpart yoke is equal to or slightly smaller than the resolution. The counterpart yoke has a magnetic contour anisotropy for restraining the divergence of the magnetic flux from the magnet. The resolution can be prevented from being reduced depending on the distance between a medium and a magnetic sensing element. At the same time, the magnet can be miniaturized.
Claims20
A magnetic sensor comprising:
- a magnetic sensing element for sensing a change in an applied magnetic flux, said magnetic sensing element being positioned adjacent to a space in which a magnetic paper-like medium is moved and also being positioned parallel to a direction of movement of the magnetic paper-like medium, said change in applied magnetic flux being caused by the movement of the magnetic paper-like medium;
- a magnet disposed close to said space for applying a bias flux to said magnetic sensing element;
- and
- a magnetic piece disposed opposite to said magnet through said space, said magnetic piece having a magnetic contour anisotropy for restraining a divergence of the bias flux in said space.
1 more element
Dependencies are inferred from the claim text.