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JPS522759

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DESCRIPTION JPS522759
-June 27, 1959, General Secretary of Patent Office '1 Title of invention 2 Inventor 3 Patent
applicant (2) 1 drawing (3) Application form 1 copy-350079152 ? Japan Patent Office Japanese
Utility Model Application Publication No. 52-275 EI Specification 1. Title of the Invention 1. Title
of the Invention Ultrasonic Transducer for Underwater Detector
Tsuru 'bmh MJ' WM scoop
3. Detailed Description of the Invention In the underwater detection device for detecting
underwater by transmitting and receiving ultrasonic pulses in water, the present invention
sequentially switches the transducers arranged on the circumference to detect 3600
circumferential directions. The present invention relates to the structure of a transducer of an all
around underwater detection device. In general, magnetostrictive vibrators are often used in the
transducers of the underwater detector. In a magnetostrictive vibrator, a bias magnetic field is
provided by a magnet, and a change in magnetic flux caused by vibration is extracted as an
induced voltage of a coil. And, for example, in the case of a ?-type vibrator, since this coil is
usually wound around its legs, the legs of the vibrator should be designed to minimize the
vibration resistance. Therefore, if such magnetostrictive vibrators are arranged in a circle, the
structure may be complicated and the weight may be increased. However, the present invention
provides a relatively simple structure and a light-weight transducer. I will provide a. This will be
described in the embodiments of the drawings. In FIG. 1, 1, 1... Indicate ?-type magnetostrictive
vibrators, and they are stacked in 10 stages in the figure. And, between the respective stages of
the transducers 1.1..., For example, the transducer liners 2, 2. Acoustic EndPage: 1-shielded by-. 1
and 3, as shown in FIG. 3, the outer vibrator liner 2 and the inner vibrator liner 3 are suitable
concentrically in the same plane, as shown in FIG. It is arranged after the interval. The ?-type
magnetostrictive transducers 1.1... are arranged in a circle on the transducer liners 2 and 3 (FIG.
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1
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 so as to be supported by the inner transducer
liners 3, 3. There is. Here, the sound sensing part IA of each of the transducers 1.1... Is adhesively
fixed to the outer transducer liner 2, but the leg part lB: Therefore, it is not adhered to the inner
vibrator liner and is supported. Then, magnets 4, 4... (FIG. 2) for applying a bias magnetic field
are inserted between the respective transducers 1.1... O legs, and this magnet 4 is inserted into
the inner transducer liner 3 It is adhesively fixed. This mold portion is molded by the sound wave
transmitting material of the transducers 1.1... Laminated as described above via the transducer
liners 2. A sound wave is transmitted and received through the water 5.
Accordingly, since the mold portion 5 is formed in a cylindrical shape, the laminated outer
vibrator liners 2, 2,... Of the respective stages are held by the mold portion. Each of the
transducers Ll,... Is adhesively fixed to and supported by the outer transducer liners 2.2.
Furthermore, the inner transducer liners 3, 3, ... support the legs IB of the stacked transducers Ll,
... while being inserted between the respective transducers 1.1 ... O legs By adhering and fixing
the magnets 4, 4 иии, 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 lid 6 and the lower lid
7 are closely attached to the upper and lower sides of the mold portion 5 by the columns 8 and
the bolts 9, 9, whereby the cylinder interior of the mold portion 5 is sealed in a watertight
manner. As described above, in the present invention, since the vibrator and the ? magnet are
supported extremely rationally, the transmission and reception of a relatively light weight and a
relatively simple structure. You can get the
4. Brief description of the drawings. Part 1 (FIGS. 1, 2 and 3 all show / examples of the present
invention. FIG. 1 is a partial cross-sectional view of the front, FIG. 2 is a partial cross-sectional
view of the top, and FIG. 3 is a view for explaining the arrangement of the transducer liner.
Patent Assignee Furuno Denshi Co., Ltd. Age 10 EndPage: 2 21st Force 3rd 5 Inventors other
than the above 3 min.? '? D inventor address same place Yoshida Yoshinari Name Yoshida
Yoshinari EndPage: ?
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