JPH01277787A - Underwater ultrasonic transmitter/receiver - Google Patents

Abstract

PURPOSE:To output a strong underwater ultrasonic wave of low frequency only in one direction from a convex shell, by providing a non-active columnar body is proximity to an active columnar body, on one side thereof and in parallel thereto. CONSTITUTION:A non-active columnar body 2 is provided in proximity to an active columnar body 1, on one side thereof and in parallel thereto. When the columnar body 1 is displaced by xsi1, lever elements 5 and 6 are displaced at a prescribed angle around a hinge element region 3. In order to transmit the vibrations of the columnar body 1 to a convex shell 7 efficiently, it is necessary to set the central part of the hinge element region 3 in the center of rotation of the lever elements 5 and 6 so that these elements may not make translational motions. For this purpose, the stiffness of the lever elements 5 and 6 must be enhanced in relation to deflection. The region 3 keeps the stiffness in the longitudinal direction, like a region 4, and is set to be flexible against bending. The stiffness of the columnar body 2 is set to be high both in the longitudinal direction and in relation to the deflection.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an underwater ultrasonic transducer, and particularly to a flex-tensional underwater ultrasonic transducer using an elliptical or similar shell. Regarding.

[Conventional technology]

Conventionally, a flex-tensional type transducer 10 using an elliptical shell as shown in FIG. 2 has been known as a transducer that emits strong ultrasonic waves at a low frequency of 3 (kHz) or less underwater. There is. This flextensional type transducer 10 is manufactured by G, Brigham and B.
, Grass+”PresenL 5tatus in
Fl-extension Transduce
r Technology”, J, Acoust.

Soc, Am,, Vol, 68. No, 4. p
p1046-1052; (1980゜10), it is composed of an active columnar body 11 and a convex shell 12, and the active columnar body 11 is vertically moved in the direction of the arrow by input voltage or input current. The convex shell 12 vibrates due to the vertical vibration.
was one that flexibly vibrates and emits ultrasonic waves P.

[Problem to be solved by the invention]

However, since such a conventional example is a double-sided radiation type, it is not suitable for an array type transducer (for example, sonar) intended for effective use in only one direction.

[Purpose of the invention]

An object of the present invention is to improve the disadvantages of the conventional example and to provide a single-sided radiating underwater ultrasonic transducer that is capable of outputting ultrasonic waves in one direction and is particularly compact and capable of high output. There is a particular thing.

``Means for Solving the Problems'' Therefore, the present invention provides an active columnar body made of piezoelectric ceramic or magnetostrictive material, an inactive columnar body disposed substantially parallel to one side of the active columnar body, and a A lever section is connected to both ends of the body and the inactive columnar body via a hinge section region, and a convex shell whose end sections are respectively connected and supported by the two lever sections. I'm picking it up.

This aims to achieve the above-mentioned purpose.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to FIG.

The embodiment shown in FIG. 1 includes an active columnar body 1 made of piezoelectric ceramic or magnetostrictive material, an inactive columnar body 2 disposed substantially parallel to one side of the active columnar body 1, and an active columnar body l. and hinge regions 3, 3 . at both ends of the inactive columnar body 2. and lever part 5.6 connected via 4.4, and these two lever parts 5
, 6, and a convex shelf connected to each of them. Each of these constituent members is integrated as a whole.

Next, the functions and overall effects of each of these constituent members will be explained.

As shown by arrow B in FIG.
When the convex shelf is displaced by ξ1, the convex shelf is deflected and deformed via the hinge area 3,3°4.4 and the lever part 5.6, and at the same time, the shape effect is added to further expand the displacement ξ1.
is given as arrow C.

Here, the active columnar body l must reduce deformation due to bending so that vibrations can be transmitted efficiently. In addition, the hinge regions 3, 3, 4.4 are designed to maintain rigidity in the vertical direction in order to efficiently transmit vibrations, and to be flexible against deflection in order to lower the resonance frequency. The side ratio has been determined. Since the displacement ratio ξ2/ξ5 and resonance frequency of the convex shelf vary depending on the shape, material, and thickness, the shape etc. are determined while making trade-offs.

On the other hand, when the active columnar body l is displaced by ξ1, the lever portion 5.6 is displaced by a predetermined angle about the hinge region 3. Here, the active pillar.

In order to efficiently transmit the vibrations of the shaped body 1 to the convex shelf, it is necessary to set the center of the hinge region 3 to be the center of rotation of the lever 4 and not to make any translational movement. For this reason, the lever portion 5.6 must have increased rigidity against deflection. The hinge region 3 is the hinge region 4
Similarly, it maintains rigidity in the vertical direction and is flexible against deflection. The inactive columnar body 2 is set to have high rigidity both in the vertical direction and against deflection.

〔Effect of the invention〕

As described above, according to the present invention, the displacement of the active columnar body is expanded only to the other side due to the action of the inactive columnar body that is installed in parallel on one side close to the active columnar body. This makes it possible to provide an unprecedented underwater ultrasonic transducer capable of outputting strong, low-frequency underwater ultrasonic waves in only one direction from the convex shell.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional example. ■... Active columnar body, 2... Inactive columnar body, 3, 4... Hinge area, 5, 6... Lever part, 7... Convex shell. Patent applicant: Nichi-Thursday Electric Co., Ltd. Agent: Patent attorney: Isamu Takahashi Figure 1 3.4: t”
y; W@t Engineering. 5 5. Roshi J＼-Sokuji 2 diagram

Claims (1)

[Claims] (1). An active columnar body made of piezoelectric ceramic or magnetostrictive material, an inactive columnar body placed approximately parallel to one side of the active columnar body, and a hinge region at both ends of each of the active columnar body and the inactive columnar body. 1. An underwater ultrasonic transducer comprising: a lever section connected via a convex shell; and a convex shell whose ends are respectively connected to the two lever sections.