JPS6115667Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transceiver head for underwater detection, such as a fish finder, which is suspended underwater from the side and transmits ultrasonic waves and receives the reflected waves.

Large-scale precision instruments such as marine measuring instruments are equipped with separate ultrasonic transmitters and reflected wave receivers, but fish finders used for recreational fishing or relatively small-scale fishing are equipped with separate ultrasonic transmitters and receivers for reflected waves. , an ultrasonic transducer with both transmitting and receiving functions is attached to the transmitting/receiving head, and ultrasonic transmitting can be performed at a maximum detection depth of, for example, 200 mm.
m, and the wave is transmitted at a timing when the reflected wave can be received after the wave is transmitted. However, if the depth of the detection water is shallow, there is a drawback that the reflected waves may be received even before the transmission of the ultrasonic pulses has been completed, causing interference with the transmitted and received wave records. The present invention eliminates this drawback.

An embodiment of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1 denotes an outer case made of rubber or synthetic resin, which is provided with a tube neck 2 formed with a mounting screw 3 for screwing and connecting to a flexible lead wire sheath tube (not shown) made of rubber or the like. An ultrasonic transducer 5 made of a piezoelectric ceramic plate 6 with electrodes 7 and 8 bonded to both sides is loaded into the inner space 4 of the case 1, and an ultrasonic reflector 9 such as cork or sponge is placed around and on the top surface of the ultrasonic transducer 5. Furthermore, a cable-like pickup element 10 is provided inside the outer case 1 to surround the outer periphery of the reflector 9. The cable-like pick-up element 10
As shown in FIG. 3, this is a flexible wire in which the outer periphery of a core wire 11 forming a center electrode is coated with synthetic resin or rubber 12 in which piezoelectric ceramic powder is dispersed, and a conductive layer 13 forming an outer electrode is further provided on the outer periphery. It is made of a flexible piezoelectric material, and has a spiral double winding as shown in FIG.

The ultrasonic transducer 5 described above constitutes an ultrasonic transmitter a, and the piezoelectric pickup element 10 constitutes a reflected wave receiver b.
A wave transmitter a and a wave receiver b surrounding the wave transmitter a in a ring shape exist inside one outer case 1. Lead wires 14 and 15 connected to electrodes 7 and 8 of ultrasonic transducer 5 and pick-up element 1
0 center electrode (core wire 11) and outer electrode (conductive layer 1)
3) Pass the lead wires 16 and 17 connected to the tube neck 2.

The wave transmitting/receiving head of the present invention transmits an oscillating voltage sent out at a fixed short period by an oscillating current transmitter of the present device (not shown) to electrodes 7 of an ultrasonic vibrator 5 through lead wires 14 and 15. . The wave is transmitted to the receiver amplifier of this machine through lead wires 16 and 17.

As clarified by the explanation of the above embodiments, the present invention has a configuration in which an ultrasonic wave transmitter a exclusively used for transmitting waves and a reflected wave receiver b exclusively used for receiving waves are provided inside the transmitting/receiving head. However, even if the timing of transmitting ultrasonic waves and the timing of receiving reflected waves overlap because the water bottom is shallow, the reflected wave receiving function operates properly and can distinguish between the transmitted signal and the received signal. There is no risk of causing confusion that would disable the ultrasonic wave transmitter a, and the piezoelectric pick-up element 10, which is the reflected wave receiver b, is constructed by wrapping a cable-shaped and flexible piezoelectric element around the outer periphery of the ultrasonic transmitter a. The transmitter a is inside the outer case.
Since it is attached together with the main body, the structure is well-organized and has the advantage of being easy to manufacture.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional side view, Fig. 2 is a plan view taken along line A--A in Fig. 1, and Fig. 3 is a partially cutaway perspective view of the pick-up element when it is extended. It is. DESCRIPTION OF SYMBOLS 1... Outer case, 2... Tube neck, 5... Ultrasonic vibrator, 10... Piezoelectric pickup element, 14,
15, 16, 17...Lead wires.

Claims (1)

[Scope of utility model registration request] A cable-shaped reflected wave receiver b made of flexible piezoelectric material is provided surrounding the outer periphery of the ultrasonic transmitter a, and the transmitter a and the receiver b are placed in an outer case. A wave transmitting/receiving head for underwater detection, characterized in that lead wires connected to both poles of the wave transmitter a and the wave receiver b are drawn out from the outer case.