Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1991-12-20
1994-03-29
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367182, 381199, 381200, H04R 2500
Patent
active
052991768
ABSTRACT:
An electromechanical transducer having permanent magnet means forming a bias field in a region between poles, and a vibratable armature having a first part in that region. The armature has a second part extending from the first part substantially externally of that region. Magnetically permeable structure includes a portion opposing the second part across a transverse gap. The latter structure is included in a closed magnetic loop comprising said first and second parts, a working gap in said region and the transverse gap, and an electrical signal coil is threaded by the loop.
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Nasar, et al., "Linear Electric Motors: Theory, Design and Practical Applications", Prentice Hall, Inc., 1987, pp. 233-239, 252.
Eldred J. Woodrow
Tibbetts Industries, Inc.
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