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JPS51128615

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DESCRIPTION JPS51128615
Secretary of Patent Office Hideo Saito @ Permission applicant Ma 141 Tokyo parts for district
Kamiosaki 2-10-45117 Representative director of the photoelectric manufacturing company 1)
Nakajima-4, list of attached documents (1) specification poison 1 piece (2) drawing 1 piece
[phase] Japanese Patent Office 0 JP-A-5-1286150 published Japanese Patent Application No. 51.
(1976) 11.9 Japanese Patent Application No. 0- 匁. 3.!? [Phase] Application date Shouka,
(197) r, / / specification 1, title of the invention
Deep-sea pressure pressure type ultrasonic transducer
36. Detailed Description of the Invention In recent years, underwater exploration by ultrasonic
wave application of underwater measuring instruments has become active, and the exploration
range is becoming deeper more and more, among these devices, especially the detection unit
which is deeply immersed in water, As the depth increases, high external fluid pressure is
applied, and in particular, the external fluid (.cndot. Radiation surface 57 ultrasonic transducer)
will be strongly affected. The present invention relates to the structure of an ultrasonic
transducer used in the high situation of the external fluid nib, which will be described below with
reference to the drawings. FIG. 1 is a longitudinal sectional view of an example of a conventional
ultrasonic transducer. The vibrator 1 is a small strain type ultrasonic vibration unit, whose back
surface 1 'is in contact with the reflection plate 2 and whose radiation surface 1' 'is in close
contact with the radiation plate 3. The material of the reflection plate 2 is extremely low in
density and rigidity with respect to the external medium 4, and when the external medium 4 is
water, if the phase rt with different ultrasonic characteristics, Ida 1 Conventionally, soft elastic
bodies such as a cork board or a rubber board containing closed cells are used as a material
containing an air layer. The material of the radiation plate 3 is a material similar to the external
medium 4 to which ultrasonic waves are emitted and the ultrasonic vibration characteristics, for
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example, in the case of the external medium 4 being water, rubber, epoxy resin or the like. is
there. The peripheral end portion 3 'of the radiation plate 3 is watertightly sufficiently fixed to
the pressure-proof type EndPage: 1i 7j 5 and is a lead wire 1a for voltage application drawn out
from the vibrator 1. 1? J is bundled in the cable 6 and penetrates the outer casing 5 and is
pulled out to the outside. At that time, the sealant 7 for the water tank is outside i ′ ′ li! In the
tj 1 ′ through part of the cable 6 of the jacket 5. Watertightly bonded to 5 and cable 6. In the
above-mentioned conventional structure, under the condition that the pressure of the external
medium 4 is Ij'lFi,-the pressure (size, from the surface in contact with the external medium 'c + 4
of the radiation plate 3, the radiation plate 3. In addition to the vibrator 1 and the reflection 1 y
2, it is transformed as shown by a dotted line. In this situation, the vibrator 1 is opposed to sweat
such as titanium 敞 bow rim · Because of the rigid material i 1, the female form is hardly raw.
Since the reflector 2 and the radiation plate 3 are made of a material having low rigidity to
pressure, each plate thickness 1, lt, 2 under normal pressure is compressed and deformed to
receive high surface pressure, and one person plate Thickness 1. /, T2 ', and the transducer is
deformed as indicated by the point-in the figure. Thus, with regard to the transmission or
reflection of ultrasonic waves between media, in the case of normal incidence, when the
thickness of the plate is an integral multiple of the half wavelength of the material, complete
transmission takes place, and the thickness of the plate The reflection is at a maximum when the
size is small.
Under this condition (and hence 1) when looking at the conventional structure of 紀, apply the
above transmission and reflection conditions under the atmosphere lE to the thickness and
length f11 of the reflector 2 and the radiation plate 3 respectively. But even when placed in +
l'1g'F, the plate [17i of the radiation plate 3 is compressed to 1.2 '(to be deformed, in particular,
the presence of an air layer is considered to be a necessary condition In the reflection plate 2
which can be made of a soft elastic material as a whole and L2, its thickness t1 is 1. / (Tetsushi
VC layered compression deformation 5 reflectors 2. The radiation plate 3 causes a volume
change, and the density and the stiffness also change. For this reason, the correlation between
the wavelength of transmission and reflection and the plate thickness taken into consideration at
normal pressure is far from the optimum condition, and the efficiency of the transducer is
extremely reduced. Among the above, as the material of the reflector plate 2 having a significant
thickness change, use a conventional phenolic resin plate or the like which has a relatively low
density, rigidity against compression, slight presence or absence of voids, etc. In some cases, the
gap is so small that the expected effect can not be obtained. In addition, a composite balloon
board in which a microballoon body having a shell of resin or glass, which has been shelled in
recent years, is mixed, solidified and bonded together with the resin has a density smaller than
that of the holed phenol resin board and the air layer is large. While it has the advantage of being
contained in a chamber, its deformation to I shrinkage has the disadvantage that the forefoot
phenolic resin plate can not be neglected, and both have high pressure directly with the oscillator
1 and both. In the case of surface contact, transmission loss of ultrasonic vibration energy and
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generation of noise are caused due to its high compressive rigidity. The present invention is
intended to solve the above-mentioned difficult problem for performance improvement of a
transducer under high pressure by changing the conventional structure significantly, which will
be described below with reference to FIG. FIG. 2 is a longitudinal sectional view showing an
embodiment of the basic structure of the present invention, which is not significantly different
from the conventional structure of FIG. The vibrator 11 is an electrostrictive ultrasonic vibrator,
and the back surface 11 'is in contact with the reflecting plate 12 via the thin plate 18, and the
reflecting surface 11 "is in close contact with the radiation plate 13'. The material of the
reflection plate 12 is the composite balloon-plate, and the thin plate 18 is a thin elastic plate
made of soft elastic material, a fibrous paper plate, or: a cloth or a plate 1 of a soft acidcontaining resin, eg Teflon paper And so on. The material of the radiation plate 13 is the same as
the material of the radiation plate 3 of FIG. The peripheral end 13 'of the radiation plate 13 is
sufficiently adhered to the outer ml5 VC water tight enough to be resistant to external pressure,
and stops the permeation of the external medium 14 into the outer shell 5 U5. Further, lead
wires for voltage application drawn out from the vibrator 11] 1a and 11b are put together in the
cable 16 and are drawn to the outside through the outer jacket I5 at 1 °.
At this time, a watertight seal 1 for watertightness is adhered to the outer sheath 15 and the
cable 16 in a watertight manner in the penetration part of the cable 16 of the sheath I5. 5
reflector 12. And let tl and t2 be the thickness under atmospheric pressure of the people of the
radiation plate 13 and t, 'and t2' when the pressure of the external medium 14 becomes high
pressure for use. Incidentally, the thickness t1 'is larger than the integral wave length of the half
wavelength in the compression elastic deformation range of the composite balloon plate under
the pressure used in use, and the wave EndPage: 2 is there. Therefore, the plate thicknesses t1
and t2 are smaller by the amount of compressive deformation than the plate thicknesses j1 ') j2'
in the atmospheric pressure section. , J-<L,-can be obtained. Further, the thickness of the N plate
18 is extremely thin compared to the thickness t2 of the radiation plate 13 and the plates 1+ and
4.11 of the reflection plate 12 of the N plate 18. The operation and effect of the above-described
configuration of the present invention will be described. It is compressed by the external
pressure and transformed as shown by a dotted line, and the radiation plate 13 changes from its
thickness t2 to t2 ', and the reflection plate 12 rolls its plate 1 source to t1' from tl. (Note that the
amount of compressive deformation of the vibrator 11 is very small because it is a precursor
phase, and the thin plate 18 has a thickness smaller than that of the radiation plate 13 °
reflection plate 12 and so on. The amount of compressive deformation of itself can be ignored
again. Under this circumstance, when the vibrator 11 is excited, the back side l ° 1 'of the
vibrator 11 is reduced in the impact vibration between the thin mutual layers of the fine layers.
For the purpose of reducing the amplitude of the vibrator 11 and causing percussive generation
of screeching, and the thin plate 18 interposed is extremely thin in thickness. , Attenuation of
ultrasonic longitudinal waves is also cheap, reflection 51. y + '3: i and 1 reflector i2i □ 11 its rate
anti 1. . rXH, 2t 1. Since each '' is given in consideration of the time of 1 crimp-off '1 ffi 1-
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deformation under high pressure as described above respectively, there is no loss of the
performance of radiation and reflection under high moon-high, high, Il ,: At the bottom, the
transmitter-receiver can fully achieve the expected performance] Y can. As described above, in
the present invention, the high pressure external medium 't'! The performance of the W-glfg
transmitter / receiver used by A. It is extremely industrially effective at one point that makes it
possible to reduce the attenuation and radiation and reflection performance of 1111
l that
occur in the transmission or reception of ultrasonic waves.
4. Brief description of the drawings Fig. 1 is a longitudinal sectional view showing an
embodiment of the conventional structure. FIG. 2 shows an embodiment of the structure
according to the present invention. 11: Radiation surface, lar] b +] la + I1 b-H 'leader line 2, 12:
Reflector, 3, 1: 3: Radiation plate. 4 · · · · · · · · external medium, 5, 15 · · · jacket, 6, 16 · · · · Goul,
7.17 · · · sealing agent,] 8 · · · thin plate, 'Jljl'l 121 +-2' · · · · · Board thickness. Patent applicant
Hikari Co., Ltd., Denso Seiyaku Co., Ltd. 5 Representative director FIXj Nakajima-EndPage: 3
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