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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
structure of an ultrasonic transducer using a wide range underwater detection apparatus k 14 C
that performs underwater detection by transmitting and receiving ultrasonic waves in a wide
range direction in water. (Object of the Invention) The applicant has provided the ultrasonic
transducer of this type described in (Japanese Patent Publication No. 56-25080). The present
invention further shows a strain transducer as described in the above-mentioned publication, and
is stacked in 10 stages in the figure. And, between the respective stages of l, 1... Acoustically by
means of a transducer liner 2.2... And 3.3 formed by sound shielding such as cork, urethane
foam, etc. It is shielded. As shown in FIG. 3, in the vibrator liners 22... And 3, 3..., The outer
diaphragm liner 2 and the inner It has been arranged through. The π-type magnetostrictive
transducers 1.1... are arranged in a circle on these transducer liners 2 and 3 (FIG. 2). The sound
sensing portions IA of the respective transducers 1, 1, ... are supported by the outer transducer
liner 2, and the legs IB are arranged to be supported by the inner transducer liners 3, 3, ... There
is. Here, the sound sensing parts IA of the respective transducers 1, 1 ... are bonded and fixed to
the outer transducer liner 2, but the leg part IB takes out its vibration energy as an electric signal
to the coil IC. Therefore, the inner vibrator liner is not bonded and supported in contact with the
inner vibrator liner. Then, between the legs of each of the transducers 1, 1..., A magnet 4.4 for
applying a bias magnetic field is inserted (FIG. 2), and this magnet 4 is inserted into the inner
transducer liner 3 Adhesively fixed to As described above, the transducer liners 2, 2. The front
surface of the sound wave emitting surface of the transducers 1, 1... Laminated through 3... Is
molded by a sound wave transmitting material such as urethane rubber, for example, The outer
vibrator liners 2, 2... Of the respective stages stacked in a cylindrical shape are held by the abovementioned mold portion. The respective vibrators 1, 1... Are adhesively fixed to and supported by
the outer vibrator liners 2, 2. Furthermore, the inner vibrator liners 3, 3, ... support the legs IB of
the stacked vibrators 1, 1, ... at the same time as between the legs of the respective vibrators 1.1
.... By adhesively fixing the inserted magnets 4.4..., They are held concentrically with the outer
vibrator liner 2.
The vibrator, the vibrator liner and the like which are cylindrically stacked as described above
are sealed in a watertight manner by the upper cover 6 and the lower cover 7. The upper cover 6
and the lower cover 7 are closely attached to the upper and lower sides of the mold 5 by the
support 8 and the bolts 9 and 9, thereby sealing the inside of the cylinder of the mold 5 in a
water hole. As described above, the conventional transducer is configured such that the vibrator
1 is fixed to the vibrator liners 2 and 3 and the stack is pressed and held by the upper cover 6
and the lower cover 7. Accordingly, the vibrator liners 2 and 3 must be made of a hard material,
which performs a sound insulation function between the vibrators and at the same time deforms
in shape with respect to the pressing force. Conventionally, a cork material and a urethane foam
material are used. These materials perform sound insulation by air bubbles mixed in the material.
However, when the pressing force is applied, the bubble portion in the material shrinks slightly,
and the entire material shrinks slightly. Therefore, conventionally, when manufacturing the
vibrators-innerers 2 and 3, the wall thickness is formed to be slightly thick, and when laminated
and configured as shown in FIG. And the mover liner is made to have a predetermined thickness.
However, it is impossible to make the thickness of the transducer liners 2 and 3 strictly constant,
and some variations occur during manufacture. Also, in the mixed state of air bubbles in Toga;
the shrinkage degree is often different even for the same applied force. Therefore, as shown in
FIG. 1, when the laminate of the transducer liner 2.3 and the transducer 1 is retained by a
process, the contraction degree of the transducer liners 2 and 3 is different in each step, and the
transducer interval is different. It varies slightly by stage. Irregular oscillator spacing gives a
significant shadow on the performance of the transducer. In other words, when transmitting and
receiving ultrasonic signals in a specific direction, in general, the transmit and receive signals of a
plurality of transducers are phase-synthesized. In this formation, it is important that each of the
transducers be arranged at a predetermined interval. When the transducer spacing is deviated
from the fixed spacing, the directivity can not be formed in a fixed direction even if the transmit
and receive signals of the respective transducers are phase-combined, and the transmit and
receive waves in the unnecessary direction The sensitivity, that is, the increase of the so-called
sub pole, significantly degrades the performance of the transducer. Further, in the transducer
shown in FIG. 1, since the pressing force by the upper lid 6 and the lower lid 7 directly acts on
the vibrator 1, when the pressing force is thickened, a load action occurs in the vibration of the
vibrator 1. Therefore, the pressing force d of the lower lid 6 and the lower lid 7] must be set so as
not to affect the vibration of the L-1 mover 1, the vibrator 1 shown in FIG. The second and third
laminates are very weak against the external force of the molding material 5.
That is, when an external pressure is applied through the molding material 5, the laminate of the
vibrator 1 and the vibrator liners 2 and 3 is easily deformed. Therefore, conventionally, the entire
transducer of FIG. 1 has to be housed in a dome, and ultrasonic waves have to be transmitted and
received through water through the dome, and the overall shape when equipped with a
transducer is large. I tend to be. Also, since sound waves are transmitted and received through
the dome, the transmission loss of the sound waves tends to be difficult. (Embodiment of the
Invention) In FIG. 4, the same reference numerals as in FIG. 1 indicate the same components. An
annular disk 10 is formed of a nonmagnetic material such as a steel plate or an aluminum plate.
The annular disc 10 is stacked in a plurality of stages with the spacer 11 interposed
therebetween. Therefore, the inter-lamination Vq% of the annular disc 10 is determined by the
dimension of the spacer 11. The spacer 11 is made of a hard nonmagnetic material and formed
in a cylindrical shape having a screw hole, and the upper and lower ends thereof are screwed to
the annular disc. A vibrator liner 12 is formed of, for example, a soft sound insulation material
such as a sponge. The vibrator liner 12 is fixed to the upper and lower surfaces of the annular
disks JO and 10, and the vibrator 1 is held between the vibrator liners 12 and 12 to be fixed. FIG.
5 shows a detailed view of the annular disc 10, the spacer 11, the vibrator liner 12 and the
vibrator 1. In the vibrator liner, the lower vibrator liner 12A is fixed to the lower annular disc
10A, and the upper vibrator liner 12B is fixed to the upper annular disc 10B. Each of the
transducer liners 12A and 12B is disposed concentrically, and is disposed so that the combined
sensing part IA and the leg part IB of the transducer 1 circumferentially arrayed at fixed angles
are fixed and supported. The thickness of the vibrator liners 12A and 12B is set such that the
exciting coil IC does not contact the annular disks 10A and 1013 when the vibrator 1 is fixed on
the vibrator liner. The annular disc 10A and the IOB fix and hold the vibrator 1 by the vibrator
liner 12A 112B, and are fixed by the screw 13 with the spacer 11 interposed. Nails: The spacing
of the annular discs 10A and 1013 is determined by the dimensions of the spacer 11. Then, the
dimensions of the spacer 11 are set such that when the annular disks 1o are stacked as shown in
FIG. 4, the distance between the stages of the vibrator 1 becomes a desired distance. The annular
disc 10 is stacked in a plurality of steps at regular intervals by a spacer 11, and is suppressed
from above and below by the upper cover 6 and the lower cover 7 in the same manner as in FIG.
Molded in material.
(Effects of the Invention) As is apparent from the above, the vibrators of each stage arranged
circumferentially are fixed and held for each stage by an annular disc, and the distance between
the stages of the oscillators is determined by the dimensions of the spacer 11 Be done. Therefore,
even if the stack of annular disks is pressed and held by the upper lid 6 and the lower lid 7, the
pressing force does not act directly on the vibrator. Therefore, suppression of the stack can be
reliably performed. Also, since each step of the annular disc 1o is screwed and laminated by the
spacer 11, even if the outer sleeve J acts from the front surface of the mold portion 5, the
external force can be sufficiently opposed by the annular disc 1o. , The transducer array is not
subject to shadowing bow. Therefore, M? In water directly without housing the transducer in the
dome as in the prior art? r can be transmitted and received ultrasonic waves. Therefore, the
sound wave transmission loss is reduced, and the mounting configuration of the transducer can
be miniaturized. Also, the distance between the stages of the vibrators arranged in the
circumferential direction is determined by the dimensions of the spacer 11, and does not change
with the pressure. Therefore, since the step interval of the transducers can be easily set to a
desired distance, it is possible to realize a transducer excellent in directivity il '. Further, since the
vibrator liner 12 only holds the vibrators of the respective stages fixedly, it is not necessary to
use hard t '′ as in the prior art, and it is possible to use a soft material such as sponge.
Therefore, the sound insulation effect between the transducers can be sufficiently obtained.
Furthermore, by forming the annular disc 1o with a nonmagnetic material such as a copper plate
or an aluminum plate, it is possible to electrostatically and magnetically shield between the
vibrators of each stage, so that the vibrators ... " Interference can be prevented. (Other
Embodiments of the Invention) In the above, the annular disc 10 uses a nonmagnetic material
such as an aluminum plate or a copper plate, but it may be formed by using a hard resin moon
such as plastics. Also, by using a resin material and adhering copper foil or aluminum foil to the
surface by heat adhesion plating or the like, it is possible to obtain the same 7-ride effect as
described above. Also, in the above, the spacer 11 is formed in a cylindrical shape, but as shown
in FIG. 6, a wall-shaped spacer 14 may be formed in the radial direction of the annular disc 10. In
this case, the spacer 14 is formed into an integral shape with the current disc 1o, and as shown
in the side view of FIG. 7, the spacer 14 is provided with the pin holes 15 and the pins 16 are
provided in the pin holes 15. The plate disks 10 may be stacked together. In this case, the
transducer liner may not be annular as shown in FIG. 5, but may be provided for each section in
which the transducer is disposed.
Further, in FIG. 5, the vibrator liners are provided on the upper and lower sides of the vibrator 1
to fix and hold the vibrator, but it is not essential to provide the vibrators on the upper and lower
sides. Alternatively, only the vibrator 12A may be provided, and the vibrators 1 may be fixed and
circumferentially arranged thereon.
Brief description of the drawings
1 and 2 show a prior art device and FIG. 3 shows a transducer liner used in the prior art device.
FIG. 4 shows an embodiment of the present invention, FIG. 5 shows a diagram for explaining the
structure of the main part, and FIGS. 6 and 7 show another embodiment. 1 ... vibrator, 5 ...
molding material, 6 ... upper unit, □ 7 ... lower cover, 8 ... post, 10 ... annular disc 11 ... spacer 12
... vibrator liner 13 Figure 3 Figure 2 Figure 1 ... screw applicant Furuno Inc. Figure 4 5 1 6 FIG
414ηS 7 1 ' L: i
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