JPH0122320Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) This invention relates to an ultrasonic transducer that transmits and receives waves in a fan-shaped range or in all directions.

(Prior art) As a transducer of this type, a transducer with a plurality of transducers arranged vertically and horizontally in a fan-shaped configuration was proposed by Utility Model Publication No. 38-18094. A unit in which vibrators are arranged vertically on a metal mounting plate is used as an element block, and the devices are arranged circumferentially with their sides adjacent to each other.
It is well known from Utility Model Publication No. 58-31092.

(Problem to be solved by the invention) However, in the former method, when one row of the vibrator 1 is defective,
There is an inconvenience that the defective transducer array cannot be replaced unless the seal is peeled off, all the transducers are taken out, and disassembled.However, in the latter case, the advantage is that the transducer 1 can be made smaller and cheaper. However, the structure of the element block is complicated, and
It is not possible to resonate in the lateral length, but only in the thickness direction, so when transmitting and receiving low frequency sound waves, the dimension in the thickness direction is
Correspondingly, it has to be made larger, and there are disadvantages such as making it difficult to reduce the overall size and weight.

Further, such transducers are used for detecting schools of fish on fishing boats or for detecting other ships on submarines, but it is necessary to use different frequencies depending on the target to be detected. For this reason, it is desirable to equip a complex type of transducer, but due to the location of the equipment, it is hoped that a single transducer can handle multiple frequencies.

The challenge was to resolve these inconveniences and expectations.

(Means for Solving the Problem) This invention consists of a means for making the vibrator into a rectangular cube, each of two or more sides of which resonates with a separate transmitting and receiving frequency, and A means for forming a transducer group by vertically cascading oscillators with a surface other than the wave transmitting/receiving surface and a reflective material layer attached to the surface other than the wave transmitting/receiving surface, and a mounting plate for the first half of the transducer group on the wave transmitting/receiving surface side. The above-mentioned problem can be solved by using a semi-rigid sound-transmitting material that is molded with the transverse cross-section formed into a trapezoidal shape with a wider side on the wave transmitting/receiving surface side. It is.

(Example) Examples will be described below with reference to the drawings.

In the figure, the mounting frame 1 is made of a rigid body such as metal or hard resin, and has upper and lower round flanges A ₁ and A _{2 .}
An opening 11 is provided by cutting out a part θ of an annular body formed by connecting a cylindrical body B to the inner side of the annular body.

The reflective floor 2 is a soft reflective material layer, for example, a single-cell sponge material, and is provided in the outer peripheral recess of the mounting frame 1 in contact with the back surface of an element block 3, which will be described later.

The element block 3 has a plurality of transducers 5 that generate ultrasonic waves arranged in series, and the sound wave transmission/reception side is molded with a semi-hard sound-transmitting material to form a holding plate 31, and both ends of the holding plate 31 are attached to the mounting frame 1. This is fixed to the outer periphery of the round flanges A ₁ and A ₂ with screws 4.

The vibrator 5 is a rectangular cubic piezoelectric material 51, and each side of the width B, height H, and depth D resonates with the frequency of the intended transmission and reception, or two of the sides resonate. , an electrode film 52 is provided on each opposing surface in the width B direction, and an electric wire 53 is attached to this. The surface of the vibrator 5 having a width B is used as a wave transmission/reception surface R for sound waves, and a semi-hard reflective material layer, such as a hiker cork plate, is attached to each surface except this surface and its back surface S to form a side reflective layer. A plurality of formed electrodes (two in the figure) are bonded in series, and each electrode film 5
Connect the electric wires 53 between the two with the same polarity to make an integrated one, and insert the latter half of the back S side of this integrated one (the one in Figure 4) into one side of the mold, and transmit and receive. The element block 3 is provided with a holding plate 31 by molding a semi-hard sound-transmitting material, such as a polyurethane material, into which the first half on the wave surface R side is inserted. Further, stepped portions 33 are provided at both upper and lower ends thereof, mounting holes 32 are formed in these portions, and electric wires 53 are led out above the holding plate 31 through both sides of the mounting holes 32.

Further, the cross section of the holding plate 31 is formed in a trapezoidal shape with an angle α in the width B direction of the wave transmitting/receiving surface R, and this angle α is made equal to the angle of the mechanical arrangement interval of each element block 3.

Furthermore, a soft reflective material layer 62, for example, a single-cell sponge material, is adhered to the back surface S to form a back surface reflective layer.

Each value in the example is as follows.

・Transmission/reception frequency ₁ approx. 15kHz (H direction resonance) ₂ approx. 75kHz (D direction resonance) ₃ approx. 200kHz (B direction resonance) ・Number of element blocks 38 pieces・Vibrator H approx. 88mm D approx. 19mm B approx. 7mm Semi-hard reflection Material hardness shore approx. 50 ・Mounting plate C approx. 200mm E approx. 10mm F approx. 2mm G approx. 13mm α 7゜hardness shore approx. 80 ・Assembled external dimensions _φ1 approx. 215mm _φ2 approx. 155 θ 90° Structure of this transducer in use For example, as shown in FIG. 7, a support shaft 71, a support frame 72,
A worm wheel 73 is inserted and attached, and the worm wheel 73 is rotated by a worm 74 so that the inclination of the axis J of transmitting and receiving waves can be changed, and this is placed in a sonar dome 75.

(Effect of the invention) The holding plate 31 is semi-rigid and the angle α is equal to the arrangement interval.
Since it is formed of
Since they are articulated, even round flanges can necessarily be precisely oriented and fixed.

Since the vibrator 5 is held by a semi-hard sound-transmitting material, very little vibration is absorbed by the mounting frame 1.

Since the vibrator 5 is shaped like a rectangular cube and its vertical direction (longitudinal direction) resonates at a low frequency, the size of the element block in the depth direction can be reduced, and the entire transducer/receiver can be made smaller and lighter.

In addition, two or more sides of each side of the rectangular cube of the vibrator 5 are made to resonate with separate frequencies, so for purposes of use that require multiple frequencies due to the detection target, one Since it can be used as both a transducer and a receiver, it has the advantage of making detection using multiple frequencies easier, even on ships where there is little space for equipment.

[Brief explanation of the drawing]

The drawings show examples, and FIGS. 1 and 7 are longitudinal sectional views of the main parts, FIG. 6 is the cross-sectional views of the main parts, and FIG. 2 is a plan view.
3 and 4 are perspective views, and FIG. 5 is a three-view projection view. 1... Mounting frame, 2... Reflective floor, 3... Element block, 4... Screw, 5... Vibrator.

Claims (1)

[Claims for Utility Model Registration] An element block is formed by integrally forming a plurality of cascaded vibrators and a holding plate, and the horizontal sides of each of the plurality of element blocks are adjacent to each other in a circumferential shape. In a circumferential array type transducer having a structure in which both upper and lower end portions of the retaining plate are attached to the outer periphery of the round flange portion of a mounting frame having round flange portions on the upper and lower portions, a. the vibrator having two or more sides resonating with separate wave transmission and reception frequencies; b) a plurality of vibrators each having a surface in the width direction of the rectangular cube as a wave transmission and reception surface, and a reflective material layer attached to a surface other than the wave transmission and reception surface; c) a semi-rigid sound-transmitting material molded with the front half of the wave transmitting/receiving surface side of the transducer group inserted therein; A wave transmitter/receiver comprising: the holding plate having a cross section in the horizontal direction formed into a trapezoidal shape with the wave transmitting/receiving surface side being wider.