Magnetically shielded electromagnetic acoustic transducer

Details Magnetically shielded electromagnetic acoustic transducer Magnetically shielded electromagnetic acoustic transducer

1989-10-26

1990-09-11

Ng, Jin F.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having protective or sheilding feature

381199, H04R 102

Patent

active

049568680

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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patent: 3177412 (1965-04-01), Carlson
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patent: 3515818 (1970-06-01), Tibbetts
patent: 3560667 (1972-02-01), Carlson
patent: 3588383 (1971-06-01), Carlson
patent: 3671684 (1972-06-01), Tibbetts et al.
patent: 3935398 (1976-01-01), Carlson et al.
patent: 4272654 (1981-06-01), Carlson
patent: 4430520 (1984-02-01), Tibbetts et al.

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