close

Вход

Забыли?

вход по аккаунту

?

JPS5579596

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 JPS5579596
Description 2 и 1 title of the invention
Ultrasonic transducer
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a
transducer for the purpose of modifying the vibration efficiency of a vibrator. The deep water
transducers used in the telemetry system are critical to the problems of waterproofing and
pressure resistance, and the transducer shown in FIG. 1 is a conventional one that addresses the
above problems. That is, 1 indicates a vibrator whose shape is a cylindrical shape, and the upper
surface thereof is a transmitted / received wave surface. Reference numeral 2 denotes a
pressure-resistant resin provided on the side surface of the vibrator 1, and 5 denotes an
ultrasonic absorber such as cork provided on the bottom of the vibrator 1 and the resin 2. 4 is an
iron case for storage. However, since the ultrasonic absorbing material 3 is compressed by the
water pressure applied to the transmission / reception wavefront of the vibrator 1 and the upper
surface of the resin 2 to change the density ?, the acoustic impedance vv ('v is the speed of
sound in the density ?) increases. Reduce transmission efficiency. When the vibrator 1 is
excited, not only transmission and reception but also the bottom and the side vibrate, but the side
of the vibrator 1 acts as a load of the whole vibrator because it is a solid resin 2 and transmission
Impact on efficiency. The present invention provides a transducer that copes with waterproofing
and pressure resistance and eliminates the above-mentioned problem of EndPage: the reduction
of transmission efficiency due to resin and water pressure. Hereinafter, the present invention will
be described based on embodiments of the drawings. However, items with the same number in
Fig. A shall perform the same function. FIG. 2 shows a cross-sectional view along the central axis
KY of a transducer having a generally cylindrical shape, in which 1 is a -cylindrical transducer
and the upper surface is a transmitted / received wave surface. As shown in the figure, the
04-05-2019
1
bottom of the inner surface is formed with an inverted conical recess having an angle of 45 ░ at
each of the inner surface bottoms and an annular triangle with an isosceles triangle having an
angle of 45 ░ around the upper side surface. It is a metal case drilled in multiple steps. R1 and
R2 show said each recessed part drilling surface. (Hereafter, it is called a reflective surface. 6) is a
filler such as urethane whose acoustic characteristics do not change with pressure. In the
transducer configured as described above, the wavelength in the filling 6 of the ultrasonic wave
generated by the vibrator 1 is ?. At this time, the dimensions of the vibrator 1 and the metal
case are determined in advance so that Ll?m?L, = n? (n and m are natural numbers). That is,
Ll corresponds to twice the distance between the side surface of the vibrator 1 and the deepest
point of the reflective surface R7. FIG. 3 shows the propagation process of the sound wave, and
shows the process of the sound wave propagation at an arbitrary point on the transducer surface
for the convenience of explanation. In the figure, the ultrasonic wave emitted from an arbitrary
point on the bottom of the transducer travels vertically downward in the filling 6, is totally
reflected twice by the metallic gobo 250 reflecting surface R1, and returns to the bottom of the
transducer.
The travel distance of the ultrasonic waves at this time is Ll regardless of the travel. That is, if
considering the propagation path of the wave Wa, first, it is reflected at the point Ra on the
reflecting surface R1, then reflected at the point Ra 'and returned to the bottom surface of the
vibrator 1, but three points, Ra , Ra ? and the deepest point of the reflective surface R1 form a
right-angled isosceles triangle whose base is RaRa ?, so RaRa ? = 2x (the distance from the
midpoint between Ra and Ra ? to the deepest point of the reflective surface R8) Therefore, the
return wave is in phase with the radiation wave, so the load condition seen from the oscillator is
equal to no load. Similarly, the ultrasonic wave emitted from the side surface of the transducer
travels in the horizontal direction in the filling 6, is totally reflected twice by the reflecting
surface R7 of the metal case 5, and returns to the above-mentioned transducer and the side
surface. The traveling distance of the ultrasonic wave at this time is L2 even after a certain
stroke, so that the return wave is in phase with the radiation wave, and hence the load condition
seen from the transducer is equal to no load. However, as explained from the theory 4 of stress
waves in two adjacent media, there is a critical angle (measured from the surface normal), and a
wave that collides with the surface at a larger angle is Total reflection. Also in the case of the
present scheme, all the incident angles are at 45 ░, which has been found to be a fully totally
reflected angle. Further, FIG. 4 shows a further embodiment of the present invention, and FIG. 4
shows a plurality of rows of isosceles triangular grooves each having an inclination angle of 45
░ at the inner bottom of the metal case 7. In the transducer having the metal case 7 provided,
the travel distance L3 of the ultrasonic wave emitted from the bottom of the transducer is
designed to be an integral multiple of the propagation wavelength. As described above, the
transducer according to the present invention makes the side and bottom direction seen from the
vibrator equal to no load, thereby improving the transmission efficiency of the transmission and
reception wavefronts, and filling 6 with small changes in acoustic characteristics due to water
04-05-2019
2
pressure. Because it is used, it can always provide stable transmission efficiency.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a conventional one, FIG. 2 shows one
embodiment according to the present invention, and FIG. 3 shows the propagation of sound
waves. 4 and 5 show another embodiment. 1 .... vibrator 5 ииииии metal casing 6 ...... packing 7 ----metal case R1 and R7 ...... reflective surface applicant Furuno stock Company EndPage: 2 ? 1u
collection twice! A + Sword О Bure 3) Closed procedure supplement (type)% formula% 1 display
of the case Showa 53 1 patent application No. 153513 2 name of the invention 2 name of the
invention ultrasonic transducer 3 person with correction Relevant address Hashizaki
Minamigaki-gun, Ronotsu-cho, 4160, May 6, 1984 (June 27, 2005). Correct as "EndPage: ?
04-05-2019
3
Документ
Категория
Без категории
Просмотров
0
Размер файла
11 Кб
Теги
jps5579596
1/--страниц
Пожаловаться на содержимое документа