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Description 1, title of the invention
Ultrasonic sound source
3. Detailed Description of the Invention The present invention relates to an ultrasonic sound
source, and more particularly to an air ultrasonic sound source for dust collection, drying and the
like, and more specifically, a plurality of rectangular vibration having stripe mode characteristics
based on a horned vibrator-based. Application of the airborne strong sound field to ultrasonic
sound sources that can be obtained by attaching plates in multiple stages at predetermined
intervals and that can obtain a sound field with good radiation efficiency and no noise pollution.
Drying is known. However, it has not reached the stage of practical use yet. This is a problem
because noise is practically high (150 dB or more) in the audio frequency range (1 to 10 KC / S).
In addition, although highly efficient sirens have been developed, there are problems with the
method of generating and treating compressed air, particularly the high level of audible sound
that is incidentally generated in the ultrasonic frequency range. There are other examples where
ultrasonic sound sources are combined with electrostatic precipitators and used for dust
collection applications, but in particular, EndPage: 1 is not satisfactory in terms of radioactivity
rate. The present inventors have found interesting facts in the process of practical application
research of ultrasonic sound source used for purposes such as aggregation removal of fumes,
drying of articles avoiding high temperature, and communication applications where radio wave
interference should be prevented. . l) In order to obtain a strong sound field, it is necessary to
increase the area and amplitude of the diaphragm. Here, when the frequency is constant,
although the caustic level increases as the vibration amplitude of the diaphragm increases, the
amplitude increase is limited due to the fatigue strength of the diaphragm. 2) With the same area
and the same amplitude, the rectangular diaphragm can obtain stronger aerial ultrasonic waves
than the circular diaphragm. 3) For the same electrical input, the rectangular diaphragm that
produces the fringe mode (the mode that appears in the form of equally spaced stripes) has the
highest activity rate for the same electrical input compared with the one that produces other
modes. good. 4) In the case of a rectangular diaphragm which produces a fringe mode, the sound
pressure level is saturated when the area of the diaphragm is greater than or equal to adulthood.
5) Increasing the Number of Sound Sources, That is, Increasing the Number of Diaphragms The
present invention has not been based on the above findings, and the diaphragms constituting a
part of the ultrasonic sound source are sized to produce a perfect fringe mode. The rectangular
diaphragms of the above-mentioned dimensional configuration are attached in a multi-pass at
regular intervals to a horn of a vibrator with a horn and to a longitudinal co-operating rod
connected to the tip of the horn as well as a rectangular plate configured. It is an object of the
present invention to generate an ultrasonic wave at an audio frequency or higher and to provide
a powerful ultrasonic sound source free of noise and having a high radioactivity rate. More
specifically, the above-mentioned striped mode rectangular diaphragm is a theoretical formula of
flexural vibration of a rectangular diaphragm newly found by the inventors et al .;% formula% and
theoretical formula of flexural vibration of a known rectangular cross section bar (where Length
of rectangular diaphragm in the direction perpendicular to the nodal line of stripe mode, lW;
Medium size of rectangular diaphragm in the direction of border of stripe mode, N: number of
nodes of arbitrary even stripe mode, N '; Arbitrary odd number smaller than N, f: Resonant
frequency of rectangular diaphragm, h: Thickness of rectangular diaphragm, CD: Characteristic
physical constant of rectangular diaphragm-, d: Nodal spacing of stripe mode) Form.
That is, the rectangular diaphragm having the dimensional configuration satisfying the abovementioned theoretical formula {circle around (1)} can form a perfect stripe mode, and therefore
the activity of ultrasonic waves is very excellent. The method of manufacturing this rectangular
diaphragm is described in detail to the river. First, the rectangular diaphragm to be manufactured
first, and the inherent physical properties of the rectangular diaphragm using a test rectangular
diaphragm having any dimensions of the same material as that of the same material. Find a
constant. That is, as shown in FIG. 1 and FIG. 2, the test diaphragm 3 is fixed to the tip of the
horn 2 of the horned vibrator 1 at its center by the nut 4 and the vibrator is observed while
observing the sand of the cradini. By changing the drive frequency of l, the resonant frequency f
of the test rectangular diaphragm and the node number N of the stripe mode when the perfect
stripe mode appears ((the node line is on both sides of the end of the horn) Since it appears in
the target, it is always an even number). At this time, the thickness dimension h0 of the test
rectangular diaphragm, the length dimension l, and the resonance frequency 1. The physical
constant CD of the rectangular diaphragm for test is determined by substituting the number N of
nodal lines in the stripe mode and the value of 1 for each of the known values into the theoretical
formula of the rectangular cross-section bar; That is, the characteristic of finding the physical
constant CD by this method is that the general formula for finding the physical constant CD;
(where E: Young's modulus, ? density, ?; Poynn's ratio) is not used. In general, it is a regression
to accurately determine the Young's modulus, density, and Poisson's ratio of a material, so that
the physical constants determined from the above equation 0 can not be inaccurate. On the other
hand, according to the above-mentioned method, the physical constant C1]-can be determined
very accurately and easily. In addition, although ? is a theoretical formula of a rectangular crosssection rod, it is applicable to the rectangular EndPage: 2 type diaphragm under the condition
that the wedge mode can be used. 8 The above description is for the duralmin plate and the
phosphor bronze plate conducted by the inventor. The physical constants determined from the
method are as shown in the following table (Table 1), and it is understood that the measurement
error is very small. Table 1 Next, a rectangular diaphragm made of the same material as the test
rectangular diaphragm, ie, a material having the same physical constant, is manufactured
according to the following procedure. First, only a nut is attached to the end of the horn of the
horned vibrator used in combination with the rectangular diaphragm to be manufactured, and
the resonance frequency f2 of the horned vibrator at this time is measured. And this resonant
frequency f2 is set as the design frequency in the manufacture of the rectangular diaphragm, and
the desired appropriate value, thickness dimension h2 of the rectangular diaphragm, the number
N2 of nodal lines of the stripe mode, and odd N ? less than N2 are set. Determine the length
dimension L L and width dimension 1 w of the rectangular diaphragm using the physical
constant CD and resonance of the above-mentioned rectangular diaphragm and the theoretical
formulas of the frequency 1 ? and ?F, and based on the values A rectangular diaphragm in
which the fringe mode occurs is manufactured.
The above theoretical formula {circle around (1)} is found by the present inventors from the
experiments described below, and is capable of reliably generating the stripe mode in the
rectangular diaphragm. This experiment was done to determine the dimensions of both sides of
the stripe mode rectangular diaphragm, and in the simple case where the east nodal line does not
appear on the long side, that is, when the width is smaller than the middle of the nodal line It was
done about. That is, this experiment focuses on the ratio of the length of the long side to the
nodal line of the fringe mode generated in the direction perpendicular to the direction of the long
side, and a perfect fringe mode occurs when the dimension of the long side is any value. Also,
conversely, it is intended to investigate the force that hardly causes vibration when the
dimension of the long side has any value. In this experiment, the horizontal median size of the
rectangular diaphragm is 81 rIn, and the length dimension of the long side is changed (both ends
are cut little by little according to the progress of the experiment). The one of 541 KHz was used.
In the experiment, the center of the rectangular diaphragm is fixed at the tip of the horn (same as
shown in FIGS. 1 and 2), the frequency is kept at a constant value 34.00 KHz, and the constant
current (0, 2A) , Find the absolute value IZfl (corresponding to the radioactivity) of the free
impedance seen from the electrical terminal. Also examine Khardni's firmness at this time. It was
found that the live measurement, free impedance IZfl changes as shown in FIG. 3 depending on
the length of the diaphragm. In this case, since the free impedance of the horn-mounted vibrator
can be regarded as constant regardless of the length of the rectangular diaphragm, the change in
the free impedance IZfl shown in FIG. 1 corresponds to the change in the mechanical impedance
of the diaphragm viewed from the horn tip. It is thought that. The arrow N-8 ░ N = 10 in FIG. 3
indicates that eight or ten equally spaced striped node lines were observed in the diaphragm of
that length. By the way, regarding the horizontal axis of FIG. 3, when N is regarded as a
continuously changing number, N = 7.5. The curve is valley at N = 9.5. Here, it is considered that
the mechanical impedance of the rectangular diaphragm seen from the horn tip is extremely
large, and therefore, vibration is unlikely to occur. From the above, when it is desired to use a
wide rectangular diaphragm in the fringe mode, the length dimension is N = 8. In order to obtain
the value of No, etc., it is sufficient to set the medium size to the value of N'-7, 5, 95, etc. If the
above experimental results are applied to the theoretical formula% equation% of the flexural
vibration of the known rectangular cross section bar and the above theoretical formula 2, the
length dimension / L and the medium size ~ of the stripe mode rectangular diaphragm are the
aforementioned theoretical formulas 0 type% Therefore the above determined 5 length
dimensions l!
It is sufficient to cut out a type 1 diaphragm based on L and medium size. According to the
experiments of the inventors, N = 5 to 30. It was possible to produce any combination as long as
the range of EndPage: 3 is in the range of N '= 3 to 9. In the table shown in F, the number of
joints of the stripe mode N: 14. Manufactured from each physical constant CD determined in
Table 1 as odd N '; 7 and theoretical formula of striped mode rectangular diaphragm ???. 12
shows an embodiment of a striped mode rectangular diaphragm. The frequency range in Table F
(Table 2) is the lower limit of the frequency at which the nodal line keeps a straight line,
observing the hardness of Kradni while changing the frequency with a small exposure width.
When the hardness of Kladney was observed using the rectangular diaphragms manufactured
according to the values shown in Table 2, good streaking modes appeared as shown in FIG. A
horn with an oscillator and a longitudinal resonance rod attached to the tip of the horn at the
center of each of four well-shaped rectangular diaphragms with high activity rate, at a position
corresponding to the wavelength of the horn and the longitudinal resonance rod, By fixing in the
eastward direction for each wavelength or half wavelength, the ultrasonic waves radiated
between the rectangular diaphragms are reinforced, and a strong ultrasonic wave is generated by
one drive source. An embodiment of the present invention shown in the drawings will be
specifically described below. FIG. 5 is a front view showing the whole of the sound source 20.
FIG. 10 is a magnetostrictive vibrator, 11 is an exponential horn, 12a, 12b and 12C are
rectangular diaphragms of which dimensions are formed so as to generate a wedge mode,
respectively 13a. 13 b is a longitudinal resonance bar. The image pickup moving member 10 is
attached to the thick end 11a of the horn 11 so that the movement of the vibration motor 10 is
transmitted from the thick end 11a of the horn to the narrow end 11b while expanding its
vibrational energy. . The fixation of the rectangular diaphragms 12a and 12b and the connection
of the longitudinal resonance rods 13a and 13b are as shown in FIG. That is, the thin end 11b of
the horn 11 and the upper ends 14 of the longitudinal resonance rods 13a and 13b are
constituted by the male screw 15, while the F ends 16 of the longitudinal resonance rods 13a
and 13b are by the helical screw 17, respectively. The male screw 15 is inserted into the hole 18
opened at the center of the rectangular diaphragms 12a and 12b, and the male screw 15 and the
female screw 17 of the F end 16 of each of the longitudinal resonance rods 13a and 13b are
screwed together. The plates are fixed so that they are parallel. The uppermost rectangular
diaphragm 12C is screwed and fixed to the upper end 141 of the vertical resonance rod 13b with
a nut 19. Reference numeral 21 denotes a mounting plate for attaching the ultrasonic sound
source 20 to a container for housing the rectangular diaphragms 12a, 12b and 12c.
What is shown on the right of the sound source 20 in FIG. 5 is one showing the skin length of the
vibration of the horn 11 and the longitudinal resonance rods 13a and 13b. As can be seen from
this figure, each of the rectangular diaphragms is attached to the antinode position AlA2A3 of the
above-mentioned wavelength so as to be at a position for each half of the amplitude of the wave.
Although the above embodiment shows the case where three rectangular diaphragms are
attached to each half wavelength of the vibration of the longitudinal resonance rod and the horn,
if four rectangular imaging plates are used, the radiation ratio is more than that. Alternatively,
these rectangular diaphragms may be attached to one wavelength of the vibration of the
longitudinal common rod and the horn. When the rectangular diaphragms are attached to the
predetermined positions as described above, the rectangular diaphragms can mutually reinforce
ultrasonic waves oscillated from themselves, and the ultrasonic waves oscillated from the entire
sound source become strong. . Since the mounting plate 21 is attached to the vibration node of
the horn, it hardly vibrates. If three or four rectangular diaphragms are used, it is proved by the
following experiment that the sound wave per sound source / base becomes strong and the
radiation efficiency is good. FIG. 7 shows this experimental setup. That is, the sound source 20 is
fixed in the container 1 by the mounting plate 21 of the horn 10, and the rectangular
diaphragms 12a, 12b and 12C are accommodated in the container 1 so that the sound field in
the container 2 is measured. . The specifications of the container III are as follows. Material: 5 wn
thick acrylic plate S ░ 475 mm 52: 310 + 111111 ░ End Page: 4S: 100I + Il + lS ░ 500Wan 24
░ S 5: 130 votes The sound source 20 has the same configuration as that shown in FIG. And
longitudinal resonance rods 13a. 13b can be removed. Each rectangular diaphragm uses a stripe
mode diaphragm with a frequency of 19.65 KH2 and 22 nodal lines, and is 234.5 x 76, made of
duralumin plate (own thickness 0.98 inches) of Own, and 5 mm? at the center I'm opening a
hole. Longitudinal resonance bars 13a and 13b are iron round bars (8) ?) having a half
wavelength resonant frequency of 19.65 KHz, and the length 13a is 130 mm, and the length 13b
is a rectangular diaphragm 12C at the final end. Taking into consideration the equivalent length
of the nut used for mounting and frequency adjustment, we set a length of 124 mm, and cut a 5
? ? male screw and a female screw for connection and diaphragm mounting at both ends of the
vertical vA rods 13a and 13b. ing. The horn is made of soft iron with a length of 160 mm and
diameters of 60 mm and 5 rrn at the large end and the thin end respectively, and the exponential
horn (amplitude increasing 12) oscillator with half-wave longitudinal resonance is a 20 KHz ?
type ferrite The oscillator was used.
FIG. 8 (I) shows the measurement results of free impedance measured from the contact terminal
of the vibrator at weak amplitude when the number of stripe mode diaphragms is increased for
each half wavelength by the longitudinal resonance bar in the above sound source. . From the
figure, it can be seen that the diameter of the dynamic impedance circle decreases as the number
of rectangular diaphragms increases, and the radioactivity ratio increases. In addition, f in the
figure. Indicates the frequency. Figure 8 (ID shows the results of an experiment using two
rectangular diaphragms of the same size but having the same area but mode I and II other than
stripe mode can be used, Figure 8 ( In comparison with the diameter of the dynamic impedance
circle in the case of using the two rectangular diaphragms of {circle over (2)}, it can be
understood how the rectangular diaphragm having the characteristics of the stripe mode has a
good activity. FIG. 9 further increases the number of rectangular diaphragms and measures the
free impedance at a weak amplitude in the same manner as above, and shows the sourcemachine conversion efficiency emem ? ? efficiency ?ea obtained based thereon. . From the
figure, it is recognized that the radioactivity ratio tends to be saturated when the number of
rectangular diaphragms is three to four. That is, it can be seen that the ultrasonic radiation
source--the radioactivity rate per group is the most smelly when three to four rectangular
diaphragms are used. 1O (I) (In '(n is an electrical input of 50 w (constant), and the number of
rectangular diaphragms is changed sequentially to 2 sheets, 1 sheet, 2 sheets, etc.) The results of
measuring the sound pressure distribution are shown in which the probe tube microphone is
inserted parallel to the wall from the hole at point b, which is open. In each of the figures, the
horizontal axis represents the position of the microphone, and the vertical axis represents the
output voltage of the microphone proportional to the sound pressure. It can be seen from the
figure that the sound pressure increases and the radioactivity rate also increases with the
increase in the number of rectangular diaphragms. As is apparent from the above-described
experimental examples, the present invention forms each rectangular diaphragm so as to satisfy
a new theoretical formula for producing a fringe mode in the rectangular diaphragm found by
the present inventors. And the rectangular vibration plate has a good activity rate, and the
rectangular vibration, a plate of 3 to 4 plates connected to the horn of the horn with a vibrator or
the longitudinal resonance bar connected to the horn, of the wavelength of the vibration Since
the arrangement is made at the position of the belly and every one wavelength or half
wavelength, the activity rate per ultrasonic wave is greatly improved. Therefore, the present
invention provides a high-power ultrasound source having an excellent radioactive rate, and
enables practical application to ultrasound application fields such as aerosol condensation and
sonic drying, etc., for dynamic application fields or communication fields. is there.
4. Brief description of the drawings. FIG. 1 is a front view of an ultrasonic sound source in which
a rectangular diaphragm is attached to the tip of a horn of a transducer with a horn, FIG. 2 is a
plan view of FIG. 1, and FIG. Is a graph showing the relationship between the absolute value of
and the length dimension of the rectangular diaphragm, FIG. 4 is a plan view showing a state in
which the wedge mode appears on the rectangular diaphragm, and FIG. 5 is an ultrasonic sound
source according to the present invention. Fig. 7 is a cross-sectional view showing the connection
state of the horn, the longitudinal vibrating bar and the rectangular diaphragm, Fig. 7 (I) is a
schematic front view of the experimental apparatus, Fig. 7 (IID is Fig. Fig. 8 (I) is a schematic side
view of the experimental apparatus of I), and Fig. 8 (I) is a graph showing the measurement
results of free impedance measured from the contact terminals of the vibrator when the number
of EndPage: 5 rectangular diaphragms in fringe mode is changed. , 8 (in the case where m is a
rectangular diaphragm other than the stripe mode is compared with FIG. 8 (I) Glass Figure 9
shown in is a graph showing a sound pressure when changing the number of the rectangular
diaphragm of changing the number of the rectangular diaphragm of the ultrasonic sound. lO:
Magnetostrictive vibrator, 11: Exponential horn, 12a, 12b, 12C = и Rectangular diaphragm, 13a,
13b иии Longitudinal resonance bar, 20 ииии Sound source. Patent Assignee Kurashiki Spinning Co.,
Ltd. Attorney Attorney Attorney Attorney Blue White and others 2 people Figure 1 Figure 2
Figure 3! ! 1 FIG. 4 EndPage: 6 co- ?Dec. 8, 1979 Secretary of Patent Office 1, Display of the
Case Showa Showa's Patent Application No. 33237 No. 2o Title of the Invention 2o Name of the
Invention Ultrasonic Sound Source 3, Correction 4, agent address 2-10, Honcho, Higashi-ku,
Osaka, Osaka, Japan-2-15-Date of correction instruction (voluntary correction) 6, object of
Ultrasonic sound source
The column of the detailed description of the invention of the specification. Drawing (FIG. 3)
Japanese Patent Application Laid-Open (JP-A) No. 116 231 (8) 7 Contents of correction (In the
specification, the following part is corrected. (1) On page 2, line 13, "(1 to 10 Kc / s) J and all," (1
to IQ KHz) J correct. (2) On page 4, line 6, correct the "longitudinal jointing rod" as "longitudinal
resonance bar". (3) Page 6, 1st line-Correct "target" as "symmetrical". (4) page 9, line 15 r541
KHzJ, r54. Correct with IKH2J and forgive. (5) Page 9, line 10 [(corresponding to radioactivity)]
delete all (6) On page 10, line 10, "N = 7.5" is corrected as [N; 7.5 J]. (7) On page 12, line 5,
correct "antinode of wavelength" as "antinode of vibration". (8) On page 12, line 18, correct
"vibration energy" as "vibration amplitude". (9) On page 13, line 9, correct "the top edge 141" as
"the top edge 14". I Correct the ?wavelength? on page 13, line 14 as ?frequency
distribution?. (6) On page 13, line 16 corrects "Wavelength" and "Amplitude". (2) On page 13,
line 17, correct "amplitude" as "wavelength". (14) 14th line ?horn 10? is corrected to ?horn
IIJ?. (B) On page 15, line 1 corrects "S2" to "S2". (15 page 15 line 19 "60 tones and 13 M 111"
are corrected as "90 m and 9 mm". (G) On page 15, line 20, "(Vibration increase 12)" is corrected
as "(Vibration increase ratio 10)". (Re) On page 16, line 10, "frequency" is corrected to [resonance
frequency-1]. (G) On page 16, line 20, correct "Electricity" to "Electricity." (R) Correct the page 17
line 9 "side" as "side". (B) Delete the "wavelength" on page 18, line 2. EndPage: 8 Warning: Page
Discontinuity (a) Page 18 4th Line ?Ultrasonic? is corrected as ?Ultrasonic sound source?.
(A) Correct the description on page 18, line 17 ?longitudinal vibrating bar? as ?longitudinal
resonating bar?. (C) p. 18, line 19 r (I delete the month. (2) On page 18, lines 19 to 20 "Fig. 7)"
of Fig. 7 (I) is deleted. (In the drawing, correct Figure 3 as attached. 3rd wEndPage: ?
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