Patent ID: 8169126
Filing Date: 2012-05-01
Classification: B06B

Abstract:
1. An omni-directional type low frequency underwater acoustic transducer comprising: a low frequency oscillator including a plurality of drum-shaped oscillators, each of said drum-shaped oscillators being constructed so that a pair of disk-shaped flexural vibrators are attached on both open ends of a conductive cylinder so as to be arranged face to face; a conductive elongated coupling member fixed to adjacent said drum-shaped oscillators at a central portion thereof so as to electrically connect between adjacent said disk-shaped flexural vibrators and thereby forming a coupling array of said drum-shaped oscillators along a central axis thereof; an elastic sliding ring attached to an annular groove formed on an outer wall of said conductive cylinder which is arranged on outermost positions of said coupling array of said drum-shaped oscillators; a cylindrical case housing said coupling array of said drum-shaped oscillators coaxially, said cylindrical case having an inner wall fitted to said elastic sliding ring so as to seal a space formed among said cylindrical case and said drum-shaped oscillators; a pair of acoustic elastic and stretchable covers attached to both open ends of said cylindrical case so as to provide a pair of sealed spaces; and insulating oil filled in said sealed spaces.