close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JPS60204196

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 JPS60204196
[0001]
TECHNICAL FIELD The present invention relates to a transducer of a transducer for ultrasonic
wave generation or ultrasonic wave reception used in an ultrasonic observation apparatus such
as a sonar. Prior Art Conventionally, as this kind of vibrator, a prism is used as a piezoelectric
material. A slider formed in a cylindrical or cylindrical shape is used. The above-described
vibrator has a simple structure, or the resonance frequency is determined by the speed of sound
and the shape of the piezoelectric material. Therefore, in order to resonate at a low frequency,
there is a disadvantage that the size becomes large. As shown in FIG. 1 tt, there is also known a
composite Langevin-type vibrator in which a metallic radiator 2 is adhered to the side end + rlj of
the piezoelectric material l. This vibrator is smaller and resonates at a low frequency, and also
has excellent electro-mechanical-1)-臂 characteristics. However, for good transfer of mechanical
stress it is necessary to make the mechanical connection between different materials rigid and
stable. Therefore, in order to obtain the desired characteristics, the contact between the
piezoelectric material 1 and the radiator 2 is precisely made, and the contact between the
piezoelectric material 1 and the radiator 2 is firmly made. For this reason, there is a disadvantage
that design specifications and manufacturing control must be made strict. OBJECTS OF THE
INVENTION The object of the present invention is to solve the above-mentioned conventional
drawbacks and to provide a compact and easily manufactured composite oscillator. The
composite vibrator of the present invention comprises a cylindrical vibrator and a radiator fitted
to both end faces of the vibrator, and an internal space formed by the radiator and the vibrator.
Is filled with a liquid or an elastic resin. In addition, it is possible to easily obtain a high-output
vibrator by coupling a plurality of vibrators to the radiator. Next, the present invention will be
described in detail with reference to the drawings. FIG. 2 is a sectional view showing an
embodiment of the present invention, and FIG. 3 is a plan view thereof. That is, a one-disk shaped
stainless steel radiator 2 is fitted on the inner circumferences of the upper and lower ends of the
17-04-2019
1
vibrator formed of the cylindrical iF core material l. An O-ring 4 is interposed between the outer
periphery of the radiator 2 and the inner periphery of the piezoelectric material 1 to maintain
airtightness between the piezoelectric material 1 and the radiator 2. A hole into which the oil
column 6 is screwed is screwed into the radiator 2. Then, the silicone oil 3 is filled in the internal
space formed by the piezoelectric material 1 and the radiator 2, and the oil pillar 6 seals the seal.
The stopper 7 is to prevent the radiator 2 or the piezoelectric material l from falling off, and is
made of, for example, a rubber cushion so as not to inhibit the vibration of the piezoelectric
material l and the radiator 2. It is adhered to the radiator 2. Further, excitation power can be
applied to both end surfaces of the pressure 7ttut through the lead wire 5.
When excitation power is applied to the piezoelectric material l, the diameter of the electric
material l decreases by 1 lli. Then, in response to the increase of the inner diameter of the
piezoelectric material 1, the silicone oil 3 repeats contraction and expansion. This force acts on
the radiator 2, and the radiator 2 vibrates in a "de" direction. That is, the piezoelectric material l,
the radiator 2 and the silicone oil 3 are integrated to constitute a composite vibrator. Now, the
frequency of excitation is piezoelectric material 1. Radiator 2. If it is sufficiently lower than the
fundamental resonance frequency of each of the silicone oil 3, the piezoelectric material 1
becomes a moat of breathing movement with uniform vibration amplitude and phase at each
point, and the radiator 2 has piston vibration of the same frequency. In the mode, the pressure of
the silicone oil 3 becomes uniform at each point. This state is represented by an electrical
equivalent circuit as shown in FIG. In FIG. 4, Cv is the compliance of the piezoelectric material 1,
Cc is the compliance of the silicone oil 3, and Mr is the mass of the radiator 2. Further, T
represents an ideal transformer, and the conversion ratio is S 2 / S I, where an area in which the
piezoelectric material 1 and the radiator 2 are in contact with the silicone oil 3 is SL and S2,
respectively. Assuming that the inner diameter of the piezoelectric material l and the outer
diameter of the radiator 2 are substantially equal, and the height of the piezoelectric material l is
H, S2 / 51 = D / 4H, and the shape of the piezoelectric material l is 4 H = If −D, then S 2 / S L
becomes 1. Furthermore, if the ratio of Cv to Cc is E: Young's-V of the piezoelectric material 1, its
thickness is t, its radius is r, the volume modulus of the silicone oil 3 is k, and the thickness of the
piezoelectric material l is sufficiently small Then, Cv> Cc, and approximately CC can be ignored.
An approximate equivalent circuit in such a case is as shown in FIG. Since the resonance
frequency f of such a vibrator is f, = 1/2 π F] "Ml, by making the mass of the radiator 2 larger
than the mass of the piezoelectric material l, the resonance frequency of the piezoelectric
material l Also lower. That is, it is possible to resonate at a small size and a low frequency, and
miniaturization is possible. また。 Since the bonding surface between the piezoelectric material l
and the radiator 2 is not rigid, manufacture is easy. Similar effects can be obtained by solidifying
the liquid resin instead of the silicone oil 3 and then solidifying it. ffIJ 6 and 7 are sectional and
plan views showing another embodiment of the present invention. In this case, the radiator 2 is
formed with the coupling portions 2a and 2b which can be respectively fitted to the end portions
of the two piezoelectric materials l, and the two piezoelectric materials l are fitted to one radiator
17-04-2019
2
2 Structure. The above-described embodiment is the same as the above-described embodiment
except that a U-shaped frame 8 made of a synthetic resin is additionally provided to reinforce the
stopper 7, and the above-described embodiment can be realized by exciting the two vibrators. It
is possible to make a transducer with a higher output than the embodiment.
According to the present invention, as in the present invention, the radiator is coupled to the side
end of the tubular vibrator by an O-ring or the like, and the internal space is filled with a liquid or
an elastic resin. The size can be reduced, and the manufacture is facilitated. Further, there is an
advantage that high-output vibration r- can be easily made 7: I by coupling a plurality of
vibrators to the radiator.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross sectional view showing a conventional Langevin type vibrator, FIG. 2 and FIG. 3
are a cross sectional view and a plan view showing one embodiment of the present invention, and
FIG. 4 and FIG. FIGS. 6 and 7 show an equivalent circuit of an example, and FIG. 6 is a crosssectional view and a plan view showing another embodiment of the present invention,
respectively.
In 1Δ, l: piezoelectric material, 2: radiator, 3: silicone oil, 4: 0 ring, 5: lead wire, 6: oil column, 7:
stopper, 8: frame. Applicant: NEC Corporation Representative: Attorney Sumita Sumita Shun Fang
1 "") I-2 Fig. A-3 Fig. 4 Sufu 4
17-04-2019
3
Документ
Категория
Без категории
Просмотров
0
Размер файла
11 Кб
Теги
jps60204196, description
1/--страниц
Пожаловаться на содержимое документа