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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view of a conventional
underwater transducer, FIG. 2 is a longitudinal side view of an underwater transducer according
to an embodiment of the present invention, and FIG. It is principal part sectional drawing of the
underwater transmitter-receiver which concerns on another Example. 1 '' front mass, 2 rear
mass, 3 electrostrictive element, 4 housing, 5 anti-vibration rubber, 8 bellows, 9 bottom plate 11.
-Piston, 12 ... seal ring.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underwater
transducer for use in an underwater acoustic device such as a sonar. Conventionally, as shown in
FIG. 1, in this underwater transducer, a synergetic pan-type vibrator consisting of a front mass 1,
a rear mass 2 and an electrostrictive element 5 is disposed in a housing 4 via a vibration proof
rubber 5. Waterproof. It is housed and held, and is supplied into the water by supplying
electrostrictive element SK power from the electrode wire 6 and the cable 7, and receives a
sound wave from the water by the front mass 1) 1 cycle 723; At 3, an electric signal is converted
and received by the cable 7. However, such conventional underwater transmission and reception.
In the vessel, by the water pressure received by the front mass 1. The amount of compression of
the vibration-proof rubber 5 changes, and the apparent elastic modulus of the vibration-proof
rubber 5 changes, or the vibration-proof rubber 5 is broken due to excessive compression force.
Therefore, particularly when the water pressure is high, it is necessary to increase the hardness
and the cross-sectional area of the vibration-proof rubber 5 to increase its rigidity, but if the
rigidity is increased in this way, the acoustic characteristics are significantly impaired. The object
of the present invention is to eliminate the drawbacks of the prior art described above, and to
provide an underwater transducer in which the change in acoustic characteristics is small with
respect to changes in external water pressure. In order to achieve this object, the present
invention is a part of the housing, movable parts such as a bellows and a piston. It is
characterized in that the pressure in the housing is changed by moving the movable member
according to a change in water pressure. Hereinafter, an embodiment of the present invention
will be described with reference to FIG. In FIG. 2, the same reference numerals as in FIG. 1 denote
the same things. Or indicate equivalent. The flange-pan type vibrator is a thick disk-shaped freon.
It is comprised of a mass 1, a rear mass 2 'in the shape of a tip, and a cylindrical electrostrictive
element 5, and is held in the cylindrical body 4 via a ring-shaped anti-vibration rubber 5 with
little acoustic loss. An expandable ring-shaped bellows 8 is disposed on the inner side opposite to
the front mass 1 side of the housing 4 and one side of the bellows 8 is fixed to the housing via a
ring-shaped fixing plate 10 The other side is disc-shaped. Bottom plate 9 is fixed. Therefore, the
bottom plate 9 moves in the direction of the arrow relative to the housing 4 itself. It will be. Also,
although the cable is penetrated to the bottom plate 9 and fixed thereto, the penetration is kept
watertight. In the thus configured underwater transducer, the bellows 8 expands and contracts
and the bottom plate 9 moves in the direction of the arrow in response to changes in external
water pressure, so that the external pressure.
The internal pressure is balanced, and from the front mass 1 to vibration isolation. The force
applied to the evening 5 is reduced. As a result, vibration-proof "the change in apparent elastic
modulus of rubber decreases. In addition, it is not necessary to use high-strength anti-vibration
rubber. In the above embodiment, a part of the housing is movably configured by the bellows 8.
However, as shown in FIG. A ring ring 12111 provided on the outer periphery of the piston 11
between the first cylinder 4 and the second cylinder 4 makes it possible to make the piston 11
slidable with respect to the housing 4 while keeping it watertight. Also in the case of this
embodiment, the piston 1] slides in the direction of the arrow in response to changes in external
water pressure, so the internal pressure on the external pressure is balanced, and the same effect
as the embodiment of FIG. 2 is obtained. As described above, according to the present invention,
a part of the housing is formed by a movable member such as a bellows or a piston, and the
movable member is moved according to the change in water pressure. It is necessary to balance
the external pressure of the underwater transducer against changes in water pressure, to
minimize the change in apparent elastic modulus of the vibration-proof rubber, and to use highstrength rubber as the vibration-proof rubber. There is no As a result, of the resonant frequency.
The change is small, and the elastic loss due to the transmission of the vibration from the front
mass to the housing is small, so that a high efficiency, high sensitivity underwater transducer is
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