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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
shape memory alloy-driven sonar transducer, and more particularly to a sonar transducer in
which a piezoelectric element is disposed between a front mass and a tail mass and bolts are
operated between the front mast and tail mass with The present invention relates to a shape
memory alloy-driven sonar transducer in which a coil-like shape memory alloy is disposed
instead of a wiring element, and the coil-like shape memory alloy is repeatedly subjected to
thermal deformation to vibrate the front mass. [Prior Art] A piezoelectric element such as
ceramic is tightly interposed between a front mass serving as an acoustic emission surface and a
tail mass Qail mass fastened to the front mass, and the piezoelectric element is driven. A sonar
transducer of the type that vibrates the front mass by itself to generate an acoustic wave is well
known. The front mass, the tail mass and the piezoelectric element constituting the sonar
transducer are coated with a rubber member or the like having an acoustic impedance similar to
the acoustic impedance of a seawater medium or the like as a whole. FIG. 2 (a) is a side view
showing the operating condition of the conventional sonar transducer. The sonar transducer 40
shown in FIG. 2 (a) is used as a component module of the cylindrical handset 10 deployed in the
socket 20 provided at the lower part of the cabinet bottom 20. As shown in FIG. 6B, the front
mass, the tail mass, and the piezoelectric element are enclosed in a rubber member, and the
radiation surface 40 is outside, and a plurality of stages and a plurality of rows are cylindrically
arranged and used. [Problems to be Solved by the Invention] The above-mentioned oscillation by
the conventional piezoelectric element utilizes the vicinity of the resonance point of the
piezoelectric element, so the dynamic range of the oscillation frequency is narrow, and the low
frequency is the size of the sonar transducer. Has the disadvantage of becoming larger. [Means
for Solving the Problems] The shape memory alloy-driven sonar transducer of the present
invention joins a coiled shape memory alloy between a front mass and a tail mass fastened
together by bolts, and repeatedly generates heat from this coiled shape memory alloy. A drive
power source is intermittently applied to generate vibration 3 in the front mass based on
memory shape reproduction by thermal deformation of the coil-like shape memory alloy and
expansion and contraction motion for the memory shape reproduction. Next, the present
invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of one
embodiment of the present invention.
The shape memory alloy drive transformer shown in FIG. テールマス2. Bolt connecting the
front mass 1 and the tail mass 2 4. Coiled shape memory alloy4. It comprises an electrode 5 and
a drive circuit 7. When electric energy is applied to the coiled shape memory alloy 4 from the
drive circuit 6 through the electrode 5, the spring-like shape memory alloy is rapidly stored in
the state of being stored so as to expand to the original memory shape by its heat generating
action. I will try to go back to On the other hand, the coiled shape memory alloy 4 functions as a
spring and operates to contract this extension, whereby the front mass 1 reciprocates, that is,
vibrates. The driving power output from the driving circuit 6 is supplied by turning back so as to
maintain this vibration, and the degree of repetition is the shape 7 weight of the front mass, the
shape of the coiled shape memory alloy 4, the spring constant, the memory shape, etc. It is set in
advance in consideration of this. Further, in this case, it is apparent that the tail mass 2 functions
together with the front mass 1 to participate in the vibration system as in the case of the
conventional case using the raw electricity element. Such a configuration of the sonar transducer
enables expansion of the dynamic range because it is not of the frequency resonance type, and
can significantly facilitate manufacture as compared with a conventional sonar transducer using
laminated piezoelectric elements. As described above, according to the present invention, by
using a shape memory alloy sonar transducer as a vibration module, the dynamic range can be
wider than that of a frequency resonance type sonar transducer using a piezoelectric element,
and lamination can be achieved. There is an effect that the manufacture is easier than the
element type transformer.
Brief description of the drawings
FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 (a) is a side
view showing an operating state of a conventional sonar transducer, and FIG. 2 (b) is a sonar
transformer of FIG. It is a perspective view which takes out and shows the causer 40. FIG.
1 · · · front mass, 2 · · · tail mass, 3 · · · bolt · 4 · coil shape memory alloy, 5 · · · · · · · · · · · · drive
circuit, 10 · · · · · · 2 o ... The bottom of the board, 3 ° ... sonar dome, 40 ... transformer 150radiation surface.
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