Magnetically shielded electromagnetic acoustic transducer
First Claim
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1. A magnetically shielded electromagnetic acoustic transducer comprising:
- an acoustic diaphragm;
a magnetic armature;
mechanical drive connection means interconnecting the armature and the diaphragm;
an electromagnetic coil disposed in encompassing relation to a portion of the armature;
magnetic connection means linking the electromagnet coil and the armature in a complete magnetic circit having a plane of symmetry across which no appreciable magnetic flux flows;
and a magnetic shield encompassing the diaphragm, the armature, the coil, and both connection means,the magnetic shield comprising two generally cup-shaped casing halves of high magnetic permeability joined together along a joint plane closely adjacent to and parallel to said plane of symmetry.
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Abstract
An electromagnetic transducer including a diaphragm mechanically connected to an armature, a coil wound tranversely around the armature, a permanent magnet adjacent the armature, and one or more additional magnetic members completing a magnetic circuit having a plane of symmetry longitudinally bisecting the armature, has a magnetic shield formed by two high-permeability casing halves joined together along a joint plane substantially concident with the plane of symmetry.
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Citations
5 Claims
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1. A magnetically shielded electromagnetic acoustic transducer comprising:
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an acoustic diaphragm; a magnetic armature; mechanical drive connection means interconnecting the armature and the diaphragm; an electromagnetic coil disposed in encompassing relation to a portion of the armature; magnetic connection means linking the electromagnet coil and the armature in a complete magnetic circit having a plane of symmetry across which no appreciable magnetic flux flows; and a magnetic shield encompassing the diaphragm, the armature, the coil, and both connection means, the magnetic shield comprising two generally cup-shaped casing halves of high magnetic permeability joined together along a joint plane closely adjacent to and parallel to said plane of symmetry. - View Dependent Claims (2, 3, 4, 5)
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Specification