Permanent magnet transducing

Details Permanent magnet transducing Permanent magnet transducing

1991-03-11

1993-06-01

Ng, Jin F.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

381199, 381200, 381205, H04R 1100

Patent

active

052167232

ABSTRACT:
A transducer includes a core of low reluctance magnetic material formed with a narrow gap. There are first and second coils of conductive material wound on the core adjacent to and on opposite sides of the gap. A permanent magnet in and substantially filling the gap is in noncontacting relationship with the core and supported to allow relative movement between the permanent magnet and the core. The core may be generally U-shaped, C-shaped or 8-shaped with the path of relative movement between the permanent magnet and the core usually generally perpendicular to the plane of the core. No portion of the core is in the plane of permanent magnet movement. The permanent magnet preferably comprises first and second contiguous permanent magnet elements having adjacent unlike poles along a boundary substantially midway between opposed surfaces of the core along the direction of relative motion.

REFERENCES:
patent: 2026994 (1929-05-01), Messick
patent: 3062926 (1959-03-01), Ronci
patent: 3937904 (1976-02-01), Parker
patent: 4020361 (1977-04-01), Suelzle et al.
patent: 5009281 (1991-04-01), Yokoyama

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