Broad-band echo sounder

Details Broad-band echo sounder Broad-band echo sounder

2002-12-04

2008-08-26

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

C310S325000, C310S321000

Reexamination Certificate

active

07418102

ABSTRACT:
An echo sounder includes front and rear masses and a layered product of piezoelectric ceramics sandwiched therebetween, and a hollow space is formed in the front mass for defining a bending vibratory plate portion; a ring-shaped piezoelectric vibrator is accommodated in the hollow space, and has flat major surface or an outer side surface held in contact with the front mass without being fixed to the bending vibratory plate; while the layered product of piezoelectric ceramics gives rise to bending vibrations in the bending vibratory plate, the ring-shaped piezoelectric vibrator is driven for vibrations at the resonant frequency so that an acoustic wave with a large amplitude is radiated from the echo sounder; the bending vibratory plate and ring-shaped piezoelectric vibrator are independently designed so that the echo sounder achieves a high acoustic radiation efficiency without sacrifice of high withstand water pressure.

REFERENCES:
patent: 3378814 (1968-04-01), Butler
patent: 4065687 (1977-12-01), Mishiro
patent: 4779020 (1988-10-01), Konno et al.
patent: 6291932 (2001-09-01), Maruyama et al.
patent: 2000-209690 (2000-07-01), None
patent: 2001-148896 (2001-05-01), None

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