Sound generation device

Details Sound generation device Sound generation device

1998-07-31

1999-12-28

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367141, 310337, H04R 2300, H04R 900

Patent

active

060090472

ABSTRACT:
A sound generating device for generating a sound wave in a body of water is provided. The device includes a pair of axially aligned pistons. An electromagnet is mounted on at least one of the pistons. Activation of the electromagnet causes the pistons to move towards each other. A spring is positioned between the pistons and biases the pistons away from each other. Provision is made for changing the spring rate during operation so that the device will operate at mechanical resonance throughout the intended frequency range. A control device controls the current flowing through the electromagnets. The current is controlled to induce a predetermined variance of axial displacement between the pistons and thereby generate a sound wave.

REFERENCES:
patent: 3725856 (1973-04-01), Chervenak
patent: 5199005 (1993-03-01), Forsberg
patent: 5206839 (1993-04-01), Murray
patent: 5206859 (1993-04-01), Anzai
patent: 5266854 (1993-11-01), Murray
patent: 5305288 (1994-04-01), Kupiszewski et al.

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