Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1992-08-14
1993-03-30
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367182, 381192, 381194, 381199, 381201, H04R 900
Patent
active
051990059
ABSTRACT:
A sonar projector having a pair of opposed oscillating pistons driven by an electromagnetic assembly is provided with reduced weight and high power by forming the electromagnetic assembly with a permanent magnet structure consisting of two coaxial longitudinally juxtaposed members each having permanent magnets radially poled oppositely to the permanent magnets of the other coaxial member, each of the permanent magnets of one coaxial member forming a series magnetic circuit with one of the permanent magnets of the other coaxial member. As a result of this arrangement, the amount of iron required for pole pieces of the electromagnetic assembly is reduced without reducing power. Furthermore, the size or volume is also reduced as compared to an equivalent projector.
REFERENCES:
patent: 3593258 (1971-07-01), Slavens
patent: 4237347 (1980-12-01), Burundukov et al.
patent: 4492827 (1985-01-01), Shintaku
patent: 4609784 (1986-09-01), Miller
patent: 4783824 (1988-11-01), Kobayashi
patent: 4902996 (1990-02-01), Takahara
Argotec Inc.
Eldred J. Woodrow
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