JPS5919516Y2 - Underwater ultrasonic transducer - Google Patents

Description

[Detailed description of the invention] The present invention relates to an underwater ultrasonic transducer used for depth sounding or fish finding.

As shown in Fig. 1, a conventional underwater ultrasonic transducer is made of lead titanate zirconate porcelain, etc., which is polarized to exhibit thickness direction vibration, and has electrodes 1a and 1b formed by baking silver on both main surfaces. The lead wire 2 a of the insulated wire 2 is placed on both electrode surfaces above.
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a and an adhesive (not shown), the large-diameter portion 4a extends upward from the bottom surface 4a' and becomes a diaphragm by the vibration absorbing material 3 through an adhesive (not shown), enclosing a vibration absorbing material that surrounds the electrostrictive element; An insulating casing 4 formed by a small-diameter portion 4b extending further upwards and covering and insulating the insulated wire 2
Since the large-diameter portion 4a of the casing 4 is suspended by a support rod 5 protruding from the hull 6 and held in the water close to the hull 6, the casing is Air bubbles generated by the vortex generated in the gap G between the large-diameter portion 4a and the hull 6 of the bottom surface 4 serve as a diaphragm for the large-diameter portion.
Since it clings to a', it has the disadvantage of significantly deteriorating the wave transmission and reception characteristics of the transducer.

The present invention has been made to solve the above-mentioned drawbacks, and the embodiments shown in the drawings will be described below.

In FIG. 2, 11 is an electrostrictive element having electrodes 11a and 11b formed by baking silver on its main surfaces, and 12 is a pair of lead wires 12a connected to the electrodes 11a and 11b.
, 12b is an insulated wire, and 13 is a sponge-like resin.

Vibration absorbing material 14, such as cork, uses the bottom surface 14a' as a diaphragm, and above it is the above-mentioned electrostrictive element 11 and vibration absorbing material 13.
A housing 15 includes a large diameter part 14a that encloses the inside and serves as a vibration transmitter/receiver, and a small diameter part 14b that covers and protects the insulated wire 12.
indicates a support rod protruding from the hull B, and these are constructed in the same way as in Fig. 1, but in the present invention, a housing is used that encloses an electrostrictive element and a vibration absorbing material and serves as a vibration transmitting and receiving section. A tongue piece 14a'' extending in the horizontal direction is formed on the side facing the hull so that the side wall of the large-diameter portion 14a abuts against the hull 16.

As described above, the underwater ultrasonic transducer of the present invention has a tongue piece formed by extending the large-diameter part of the casing, which serves as a vibration transmitting/receiving part, horizontally in the direction of the ship's hull, so that it comes into contact with the hull of the ship. Because of this structure, it is possible to prevent eddy currents generated near the liquid transmitting/receiving section, eliminate the adhesion of air bubbles in the wave transmitting/receiving section caused by this, and have an excellent effect of improving the wave transmitting/receiving characteristics.

However, it is preferable that the tongue extending from the large-diameter portion of the casing to come into contact with the ship's belly has a shape that expands in the direction of the ship's belly. There is no harm in making the surface a little smaller.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a conventional underwater ultrasonic transducer, Fig. 2 is a vertical cross-sectional view of the underwater ultrasonic transducer of the present invention, Fig. A is a longitudinal cross-sectional view, and Fig. B is a longitudinal cross-sectional view of the underwater ultrasonic transducer of the present invention. It is a top view made into a cross section. 11... Electrostrictive element, 14... Housing, 1
4a・Song・Wave transmitting/receiving part, 14a″... tongue piece, 16
・・・・・・Hull.

Claims (1)

[Scope of utility model registration request] An underwater ultrasonic wave transmitter/receiver in which a side wall of a wave transmitting/receiving part of a casing containing an electrostrictive element is formed with a tongue extending horizontally so as to come into contact with a ship's hull.