close

Вход

Забыли?

вход по аккаунту

?

JPS5942000

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS5942000
[0001]
The present invention relates to a multi-frequency ultrasonic transducer including a bolted
piezoelectric vibrator having a plurality of pairs of piezoelectric elements and a plurality of lead
terminals. In recent years, most fishing boats are equipped with a fish finder, but the frequency
used differs depending on the fish species to be detected, and when the fishing boats are densely
operated in a fishing area, the one with the same frequency is accompanied by interference. The
fish finder did not show its original performance, and a multi-frequency fish finder was required.
In order to solve these problems, a plurality of transducers with different frequencies or a
transducer containing a plurality of transducers with different frequencies is used. However, the
size of the transmitter and receiver has become large, and it is unsuitable for small vessels in the
near-sea fishery, and also has the disadvantage that the price is significantly high. Also, as
another fish finder, the resonance frequency of the thickness vibration and radial vibration of the
disk-shaped piezoelectric vibrator or the thickness vibration of the square plate-shaped
piezoelectric vibrator and the vibration in the short side direction and the vibration in the long
side direction are used. The transducer is also known, but in view of the input power and
directivity characteristics, the diameter of the disc of the disc-shaped piezoelectric vibrator or the
length of one side of the square plate of the disc-shaped piezoelectric vibrator is practically used.
However, there is a disadvantage that only two or three frequencies whose use frequencies are
widely separated can be obtained. The present invention is characterized in that ultrasonic waves
of a plurality of frequencies can be arbitrarily input / output by changing the drive point with
one vibrator in order to eliminate the drawbacks of the above-mentioned conventional example,
and the object is to provide a device Provides a multi-frequency ultrasonic transducer which is
compact and does not cause any interference. Hereinafter, embodiments of the present invention
will be described in detail with reference to the drawings. FIG. 1 shows a side view of a multifrequency ultrasonic wave transducer according to an embodiment of the present invention,
04-05-2019
1
wherein 1.2.3 is an electrode having an extraction terminal 4.5.6 between the contact surfaces. A
pair of piezoelectric elements 7.8.9 and 10 are metal terminals respectively provided on the
other surface of the pair of piezoelectric elements 1.2.3, and a metal rod (not shown) passing
through the piezoelectric elements It is screwed on. Here, the pair of piezoelectric elements 1.2.3
are opposed to each other so that the polarization directions have the same polarity with each
other, and 0.125.0.25 and 0.5 from one end face with respect to the total length of the vibrator,
respectively. In one embodiment, one PZT piezoelectric element has a thickness of 5 questions,
and a pair of piezoelectric elements are formed, and each pair of piezoelectric elements 1. The
metal terminals 7.8.9 and 10 made of aluminum (At ") are arranged so that the centers of 2 and 3
are located 72 mm, 36 朋 and 18 胛 from the end face of the vibrator and the total length
becomes 144 in order to vibrate Configure a child.
The diameter of the vibrator is 25 immediates. In the multi-frequency ultrasonic transducer of
this embodiment configured as described above, first, when a variable frequency power source is
connected to the gap between the lead terminal 4 and the metal terminal 7 to drive one pair of
piezoelectric elements, As shown in FIG. 2, large resonances are obtained at the frequencies f1,
f3, f5 and f9, and the resonance frequency and resonance impedance are fl (14, 43 KH 臥) as
seen in the recording of the drive end 4 of Table 1. 740 Ω), f3 (45, 44 Next, the lead-out
terminal 5 is connected to one terminal of the variable frequency power supply, and either of
metal terminals 7.8.9 or 10 is connected to the other terminal, a pair of piezoelectric elements
When 2 is driven, as shown in FIG. 3, a large resonance is obtained at fl, f2, f3, f5 and f6, and the
recording value of the driving end 5 of Table 1 is obtained as its resonance frequency and
resonance impedance. Be Further, when the pair of piezoelectric elements 3 is driven using the
lead terminal 6, large resonance J 辰 is obtained at the resonance frequencies f2, f3, f4, f5 and f8
in FIG. 4. As the resonance frequency and the resonance impedance, The recorded value of the
driving end 6 in Table 1 is obtained. Next, when the lead terminals 4 and 5 are connected to form
one terminal and connected to the variable frequency power source and the pair of piezoelectric
elements 1 and 2 are respectively connected, frequencies f1 and f2, as seen in FIG. A large
resonance can be obtained at f5 and fl, and the recorded value at the drive end 4-5 of Table 1
can be obtained as the respective resonance frequency and resonance impedance. 0 Next, the
lead terminals 4 and 6 are electrically connected 1 When the pair of piezoelectric elements 1 and
3 are driven as terminals, resonance is obtained at the frequencies f1, f4, f5 and f6 in FIG. 6, and
the recorded values at the drive end 4-6 of Table 1 are obtained. Further, when the lead
terminals 5 and 6 are connected to form one terminal and the pair of piezoelectric elements 2
and 3 are similarly driven, resonance is obtained at the frequencies f11 f2, f3 and f5 of FIG. The
recorded value of the drive end 5-6 of the table is obtained. Next, when the lead terminals 4 and
5 are electrically connected to form one terminal and connected to the variable frequency power
source to drive the pair of piezoelectric elements 1, 2 and 3, respectively, the frequencies f1 and
f2 in FIG. , F3, f4 and f5, and as the respective resonance frequencies and resonance impedances,
fl (14, 18 KH and 198 Ω) and f2 (29, 14 KH The values of f 3 (43, 46 KH 7 A 3 4.0 Ω), f 4 (55,
04-05-2019
2
07 KH, 215 Ω) and f 5 (72, 2 KH 臥 157 Ω) are obtained.
As is apparent from the above measurement data, the bolted piezoelectric vibrator configured in
FIG. 1 is excited at different fundamental frequency and at odd or even multiples of the
frequency by exciting the connection of the drive terminal. Nine resonance frequencies that can
be put to practical use can be obtained. In order to use this as an underwater ultrasonic
transducer, when eight piezoelectric transducers of the structure of FIG. 1 are brought close to
two rows and housed in a low-sea rubber housing, the transmission and reception sensitivity is
measured in water, When using the drive terminals as shown in Table 2, the most sensitive
transducer was obtained at each frequency. As described above, according to the present
invention, the lead terminal is provided with the pair of piezoelectric elements interposed
between the piezoelectric element so as to be positioned at 0.125.0.25 and 0.5 with respect to
the total length of the vibrator. , A bolted piezoelectric element screwed with a metal rod as a
metal terminal, and the like, by exciting each lead terminal or two or three lead terminals by
electrically connecting them, a plurality of different frequency super A sound wave can be output
by one vibrator, and a multi-frequency ultrasonic transducer can be configured by using the most
efficient drive terminal among the plurality of overlapping frequencies.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a side view of a multi-frequency ultrasonic transducer according to an embodiment of
the present invention, and FIGS. 2 to 8 are diagrams for explaining the operation of FIG.
1.2.3 ... 1 pair of piezoelectric elements, 7.8.9 ... metal terminals, 4.5.6 ... extraction terminals.
04-05-2019
3
Документ
Категория
Без категории
Просмотров
0
Размер файла
11 Кб
Теги
jps5942000
1/--страниц
Пожаловаться на содержимое документа