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US 5,450,372 AGranted
Magnetoresistive microphone and acoustic sensing devices
AssigneeAT&T Corp.
InventorsSungho Jin, Larry A. Marcus, Mark T. McCormack
Life of this patent
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Abstract
In accordance with the invention, a new type of microphone utilizes a magnetoresistive sensing element. Specifically, acoustical energy causes vibrations between a magnetoresistive element and a magnet, producing a variation in the resistance which can be used to convert an acoustical signal into a corresponding electrical signal.
Claims10
An acoustic sensing device comprising:
- a magnet for producing a graded magnetic field;
- a sensing element comprising a body of magnetoresistive material, said magnetoresistive material comprising a compound of the form A.sub.w B.sub.x C.sub.y O.sub.z where A comprises one or more rare earth elements, B comprises one or more elements chosen from the group consisting of Mg, Ca, Sr, Ba, Pb and Cd, and C is one or more elements from the group consisting of Cr, Mn, Fe and Co;
- and
- a diaphragm responsive to acoustic waves for varying the distance between said sensing element and said magnet.
1 more element
Dependencies are inferred from the claim text.