JPH09299881A - Ultrasonic sound source using fringe mode diaphragm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a further intense sonic field by linearly converging ultrasonic waves emitted from one side face or both of the front and rear side faces of a fringe mode diaphragm without diffusing the ultrasonic waves. SOLUTION: Reflecting plates 2A and tilting reflecting plates 3A to reflect ultrasonic waves emitted from a face of a fringe-mode diaphragm 1A toward a radiating aperture Z opened in one end and to give composite sonic waves are respectively installed in one face side or both of the front and rear face sides of the fringe-mode diaphragm 1A. Moreover, parabolic reflecting plates 4 to linearly converge the composite ultrasonic waves radiated from the radiating aperture Z inward are continuously installed in respective reflecting plates 2A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic sound source capable of radiating a high sound pressure ultrasonic wave into a gas, and more particularly to an ultrasonic sound source using a fringe mode diaphragm.

[0002]

2. Description of the Related Art Conventionally, various ultrasonic sound sources have been developed aiming at the application of strong aerial ultrasonic waves. Among them, the stripe mode diaphragm type sound source has a high efficiency in aerial ultrasonic waves with a large output capacity. Utilizing the characteristics that can be generated in, the research for industrial use such as dust collection and drying is greatly advanced.

The stripe mode diaphragm type sound source is, for example, Japanese Patent Publication No.
7-57192, the length dimension (LV) in the direction perpendicular to the nodal line in which the stripe mode appears and the width dimension (LW) in the nodal line direction are theoretical formulas of bending vibration of the rectangular diaphragm;

[Equation 2] [However, N: the number of nodal lines in any even stripe mode, N ':
Formed so as to satisfy an arbitrary odd number smaller than N, f: resonance frequency of rectangular diaphragm, h: thickness dimension of rectangular diaphragm, CD: intrinsic physical constant of rectangular diaphragm, d: nodal line spacing of stripe mode By attaching a vibrator to the center of the rectangular diaphragm and vibrating the vibrator, a strong ultrasonic wave having an audible frequency or more is generated from both front and back surfaces of the diaphragm.

[0004]

By the way, the sound waves radiated from the diaphragm of the fringe mode diaphragm type sound source are the arrows A and B in FIG. 9 attached, or FIG. 1 in JP-A-6-47346.
As shown by the arrow in Fig. 3, the light is radiated in two directions (same as the front and back) at a specific angle with respect to the diaphragm surface, and in the direction of the side parallel to the nodal line of the stripe mode, the length of that side is approximately The radiation is limited to within the range.

Therefore, the ultrasonic wave generated from the fringe mode diaphragm is attenuated after being radiated into the air as it is, so that there is a problem that the sound wave energy cannot be effectively utilized. In addition, based on the above theoretical formula. The striped mode diaphragm formed in a rectangular shape has a width dimension (LW) in the nodal line direction as the nodal line, as described in FIGS. 2 and 4 of the above Japanese Patent Publication No. 57-57192. The shape is shorter than the length dimension (LV) in the vertical direction, that is, the frontage is made very narrow, so that there is a problem that the range of the strong sound field is necessarily narrowed.

An experiment was conducted to expand the range of the sound field by increasing the length of the width dimension (LW) in the nodal direction without being based on the above theoretical formula, but it is preferable to increase the width dimension (LW). It turns out that the stripe mode cannot be obtained.

[0007] Therefore, the technical problem of the present invention is to focus the ultrasonic waves generated from the plate surface of the fringe mode diaphragm in a line shape without diffusing them and to obtain a strong sound field. To widen the range of the sound field.

[0008]

[Means for Solving the Problems] Means taken in the present invention for solving the above technical problems are as follows.

(1) An ultrasonic sound source configured to generate an ultrasonic wave on one side surface by vibrating a rectangular diaphragm sized to generate a stripe mode. Along the side surface, a radiation port is opened on one side of the diaphragm parallel to the nodal line of the stripe mode, and ultrasonic waves generated from one side surface of the diaphragm are reflected toward the radiation port. A parallel parabolic reflector that reflects the ultrasonic waves radiated from the radiation port inward and focuses it in a line is installed at the tip of this reflector. .

(2) An ultrasonic sound source configured to generate ultrasonic waves on both front and back surfaces of a diaphragm by vibrating a rectangular diaphragm dimensioned to generate a stripe mode. With the front and back sides of the diaphragm parallel to the nodal line of the striped mode, radiation ports are opened on both sides of the front and back sides of the diaphragm, and the ultrasonic waves generated from both the front and back sides of the diaphragm are emitted. The front and back reflectors that are configured to reflect toward the mouth are arranged in parallel, and each of these reflectors reflects each ultrasonic wave emitted from the front and back emission ports to the inner surface and forms a line. Install a parabolic reflector that focuses on the.

(3) The focus points of ultrasonic waves linearly focused by the parabolic reflectors connected to the front and back reflectors,
Set on the extension line of the diaphragm.

(4) By changing the curvature of the parabolic reflectors connected to the front and back reflectors, the ultrasonic waves radiated from the front and back radiation ports are placed at symmetrical positions with respect to the extension line of the diaphragm. It should be configured so that it converges in a line shape at each focal point.

(5) By making the curvatures of parabolic reflections connected to the front and back reflection plates different from each other, the ultrasonic waves emitted from the front and back radiation ports are linearly focused at the focal points at different positions. To configure.

(6) The entire length of the striped mode diaphragm is defined by the length Lx of the side parallel to the nodal line where the striped mode appears and the length Ly of the side perpendicular to the nodal line. Theoretical formula of bending vibration of

[Formula 1] [where Nx: number of nodes (odd value), Ny: number of nodes (even value), λf: wavelength of bending number] At the center position with respect to the side perpendicular to the line, and with respect to the side parallel to the nodal line, at the same antinode position from both end sides in the displacement distribution of bending vibration,
Also, attach the left and right vibrators to the left and right driving point positions where a substantially linear stripe mode appears when driven.

(7) Inclined reflection of ultrasonic waves emitted from the diaphragm in the direction opposite to the emission port on one end face of each of the reflection plates arranged side by side on the front and back sides of the vibration plate in the direction of the emission port. To install boards in series.

According to the means described in the above (1), the ultrasonic wave generated from one side surface of the fringe mode diaphragm is reflected toward the front and back radiation ports without being diffused, and is further radiated from this radiation port. Since the ultrasonic waves are focused into a single line by the parabolic reflector, it is possible to form a stronger sound field than before.

According to the means described in the above (2), since the ultrasonic waves emitted from the front and back emission ports of the fringe mode diaphragm are focused by the front and back parabolic reflectors into one line. , It is possible to form a stronger sound field than before.

According to the means described in the above (3), since the focus point of the strong ultrasonic waves focused in a line shape is set on the extension line of the fringe mode diaphragm, the focus point can be easily set in actual use. In addition, it is possible to accurately find and precisely radiate a powerful ultrasonic wave focused in a single line toward a necessary portion of a dust collector or a dryer.

According to the means described in (4) above, the parabolic reflectors on the front and back sides having different curvatures from those of the reflector are used,
Since each ultrasonic wave emitted from the front and back radiation ports can be focused in a line shape at each of the symmetrical focusing points that sandwich the extension line of the diaphragm, it is possible to expand the range of the powerful sound field. To

According to the means described in the above (5), since each ultrasonic wave emitted from the front and back emission ports can be focused in a line shape at the focusing points at different positions, a strong sound field can be obtained. It is possible to expand the range of.

According to the means described in the above (6), by making the driving points of the fringe mode diaphragm two left and right, it is good even if the length of the side parallel to the nodal line of the fringe mode diaphragm is increased. Since it is possible to obtain various fringe modes, it is possible to broaden the front of ultrasonic waves focused in a line by a parabolic reflector to obtain a stronger sound field in a wide range.

According to the means described in the above (7), the inclined reflection plate emits ultrasonic waves emitted from one side surface or both front and back surfaces of the fringe mode diaphragm in the direction of reflection from the emission port, respectively. Since it is reflected to, the ultrasonic waves generated from the fringe mode diaphragm can be combined and radiated to the emission port, and as a result, the parabolic reflector strengthens the ultrasonic waves focused in a line, and Allows you to build a powerful sound field.

As described above, the above (1) to
The technical problems described above can be solved by the means described in (7), and the problems of the conventional technology can be solved.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an ultrasonic sound source using a fringe mode diaphragm according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a perspective view for explaining the basic structure of the present invention. In the figure, 1A is a rectangular diaphragm (hereinafter referred to as a stripe mode diaphragm) dimensioned to generate a stripe mode, Reference numerals 2A and 2A 'denote front and back reflecting plates provided in parallel with the front and back surfaces of the striped mode diaphragm 1A at regular intervals, and 3A and 3A' denote the striped mode diaphragm 1A and each reflector 2.
A slanted reflector installed diagonally so as to close one end of A, 2A ', and Z, Z'denotes an emission port which is the other end of the striped mode diaphragm 1A and each of the reflectors 2A, 2A'. Show.

In order to configure the present invention described in claim 1, the lower reflection plate 2A 'and the inclined reflection plate 3A' are removed from the ultrasonic sound source of the double-sided structure shown in FIG. The bottom surface side of the diaphragm 1A may be covered with glass wool or the like, an example of which is shown in FIG.

FIG. 3 is a plan view showing a state in which a stripe mode appears on the upper surface of the stripe mode diaphragm 1A described above. In the figure, LV is a length dimension in a direction perpendicular to the nodal line of the stripe mode. , L
W represents the width dimension in the nodal line direction, and these dimensions are obtained by the theoretical formula described in Japanese Patent Publication No. 57-57192, as described above. As described above, the striped mode diaphragm 1A having a size configuration that satisfies these theoretical formulas forms a perfect striped mode and has a very high ultrasonic wave activity.

In FIG. 1, 5 is a horn 5H and a resonance rod 5.
In the vibrator in which T is attached in the axial direction, the tip end of the resonance rod 5T penetrates the hole 2H of the back side reflector 2A 'and is coupled to the center of the striped mode diaphragm 1A with a nut 6.
When the vibrator 5 is driven by the power supply from the power supply unit 7, the striped mode diaphragm 1A vibrates, and ultrasonic waves are radiated from both front and back surfaces in the directions A and B shown in FIG.

In FIG. 9, AH and BH indicate the emission regions of the respective ultrasonic waves emitted from the front and back surfaces of the striped mode diaphragm 1A in the oblique directions A, B and A ', B', respectively.

The above-mentioned reflectors 2A and 2A 'and inclined reflectors 3A and 3A' generate ultrasonic waves radiated in the directions A, B and A ', B'in FIG. 9 (a), (b) in FIG. ), All of them are configured to be reflected in the direction of the radiation port Z (the description of the back surface side is omitted) and combined, and the front and back reflection plates 2A, 2
The distance between A ′ and the striped mode diaphragm 1A is made to have a maximum electric impedance (for example, about 67 mm),
The inclined reflectors 3A and 3A 'have condenser microphones for sound pressure distribution measurement placed at fixed points of the emission ports Z and Z'.
The output voltage is set to the maximum.

On the other hand, FIG. 2 is a perspective view illustrating another basic structure of the present invention. In the figure, 1B is for obtaining a powerful sound source in a wider range than that shown in FIG. Wide striped mode diaphragm with long sides parallel to the nodal lines, 2
B and 2B 'are reflectors arranged side by side on the front and back sides of the striped mode diaphragm 1B at regular intervals, and 3B and 3B' are oblique reflections installed obliquely so as to close one end of the front and back sides. In the plate, the intervals between the striped mode diaphragm 1B and the reflectors 2B and 2B 'and the mounting conditions of the inclined reflectors 3B and 3B' are the same as those described in FIG.

FIG. 4 is a plan view showing the structure of the wide striped mode diaphragm 1B used in the invention shown in FIG. 2, and the side parallel to the nodal line in which the striped mode of this diaphragm 1B appears. Lx and the length Ly of the side perpendicular to the nodal line
Is a theoretical formula for bending vibration of a rectangular diaphragm;

## EQU1 ## where Nx is the number of nodes (odd value), Ny is the number of nodes (even value), and λf is the wavelength of the bending wave.

As shown in FIG. 4, the driving point position of the striped mode diaphragm 1B is the center position with respect to the side perpendicular to the nodal line and the bending vibration with respect to the side parallel to the nodal line. The position of the first antinode from both ends in the displacement distribution of the driving point (1-
1 '), and the position of each belly is sequentially (2-
2 '), (3-3'), and (4-4 ').

In the experiment, the driving point (1
-1 ') to (4-4') are attached with resonance rods 5T and 5T connected to two left and right vibrators 5 and 5 (specifically, horn 5H) and driven with the same phase and the same amplitude. The relationship between the driving point position and the vibration mode was examined by observing the sand map of Gradni.

The following table shows the above experimental results.

[Table 1]

In the above table, ∘ indicates that a substantially linear striped mode appears, △ indicates that the nodal line is curved in a dotted or wavy manner, and x indicates a vibration mode other than the striped mode. It means that the number of clauses Nx is 13,1 from this table.
In No. 5, a good stripe mode appears regardless of the driving point position from the driving points (1-1 ') to (3-3'), and the number of nodes Nx is 1.
In No. 9, a good stripe mode appears only at the driving points (1-1 ') and (2-2'), and when the number of nodes Nx is 21 or more, all at the driving point (2-2 '). Since a good fringe mode appears in the diaphragm of Fig. 4, from these results, the driving point position of the fringe mode diaphragm 1B in which the left and right vibrators 5 and 5 are driven at two points is (2) It has been found that the position of -2 ') is suitable.

[0037]

[Table 2] The above table shows an example of dimensions of the wide striped mode diaphragm 1B. Next, with respect to the striped mode diaphragm 1B formed according to the dimensions of this table, it is clarified by the above-mentioned experiment. The left and right vibrators 5 at the driving point position (2-2 ′)
The respective resonance rods 5T and 5T of No. 5 were fixed with nuts 6 and 6, and the amplitude displacement distribution of the vibration plate surface when driven was measured.

The measurement is performed by the power supply unit 7 for each transducer 5, 5.
5 is an example of the measurement result, and the amplitude distribution in the y-axis direction is relatively uniform and sinusoidal. On the other hand, the distribution of the amplitude displacement in the x-axis direction at each antinode position is almost uniform near the center and decreases toward the driving point, and is about twice that near the driving point near the center. I found out.

The ultrasonic waves radiated from the wide fringe mode diaphragm 1B by driving the vibrators 5 and 5 are the same as those described in the invention of claim 1 as shown in FIG. Reflected in the procedure shown in (a) and (b), the emission port Z,
Emitting a strong synthetic sound toward Z, but next,
The sound pressure distribution of the synthetic sound at each emission port Z will be measured.

FIG. 6 shows the direction of the x-axis at the emission port Z (see FIG. 2).
(See FIG. 3) is an example of the result of measuring the sound pressure distribution, and the horizontal width of the figure is the distance from the center of the striped mode diaphragm 1B, and the vertical axis is the sound pressure level at point A as a reference. From the drawing, the sound pressure level becomes almost constant in the range of about 200 (mm) from the center of the length of the side parallel to the nodal line to the both ends. It can be seen that the sound pressure level is gradually decreasing.

FIG. 7 shows the direction of the y-axis at the emission port Z (see FIG. 2).
2) shows an example of the result of measuring the sound pressure distribution in the y-axis direction that passes through the position (point A in FIG. 6) where the sound pressure distribution in FIG. The distance from
The vertical axis shows the standardized sound pressure level based on the sound pressure level at point A. From the drawing, the sound pressure level becomes maximum near the center of the opening width, and the sound pressure level goes toward both ends. It can be seen that it is gradually decreasing.

FIG. 8 shows an example of the result of measurement of the relationship between the electric input and the output sound pressure at the position where the sound pressure level becomes maximum (point A in FIGS. 6 and 7). The horizontal width of the figure shows the electric input to the sound source, and the vertical axis shows the microphone output voltage proportional to the sound pressure.From the figure, the microphone output voltage proportional to the sound pressure is the electric input to the sound source. It can be seen that the value increases in proportion to approximately the power of 1/2.

From the above measurement results, assuming that a sound pressure level of 160 [dB] is obtained at the position where the sound pressure level becomes maximum (point A in FIGS. 6 and 7), it is necessary for sonic drying. The range of the sound pressure level (150 [dB] or more) is about 60 [mm] in the direction of the opening width and about 300 [mm] in the length direction of the side parallel to the nodal line of the diaphragm. It was found that a strong sound field can be formed in a wide range of about 75 [%] of the opening area (radiation port Z) shown in FIG.

In FIGS. 1 and 2, 4A, 4A 'and 4A
B and 4B 'are the above-mentioned reflectors 2A, 2A' and 2B,
Parabolic reflectors 4A to 4B ', which are parabolic reflectors connected to the tip of 2B', are formed by reflecting plates 2A, 2A ', 2B and 2B' as shown in FIG.・ 3A, 3A '・
3B and 3B 'reflect off the respective radiation openings Z and Z', and if they are left as they are, they are radiatively diffused along the reflection areas EH ... in the upward and downward oblique directions indicated by reference numerals A and B and A'and B ', respectively. The strong ultrasonic waves are reflected inward in the reflection areas EH ... As shown by the arrows in FIG. 12, and are focused linearly at the focal point F or F ′ as follows according to the curvature thereof. It is configured.

FIG. 12 illustrates the structure of the present invention as set forth in claim 1, which is a striped mode diaphragm 1A, 1B.
The parabolic reflectors 4A and 4B, which are connected to the front end portions of the reflectors 2A and 2B arranged side by side on the surface side, form the synthetic sound waves A and B radiated obliquely upward from the emission port Z by arrows. While the reflected sound wave is reflected inward as shown in FIG.
Stripe mode diaphragm 1 as shown according to the curvatures of A and 4B
It is configured to focus linearly on a focal point F on the extension line SL of A or 1B, or a focal point (not shown) other than the extension line SL.

FIG. 13 illustrates the structure of the present invention as defined in claims 2 and 3, and includes upper and lower reflection plates 2A and 2A.
Parabolic reflectors 4A, 4B, 4A 'and 4B', which are connected to the respective tip portions of A'and 2B and 2B ', are radiation ports Z and Z'on the front and back.
Synthetic sound waves A, B and A ′, B ′ radiated from each of the parabolic surfaces SA of the front surface side parabolic reflectors 4A, 4B on the extension line SL of the fringe mode diaphragms 1A, 1B. Axis S1
And the central axis S2 of the parabolic surface SB of the back surface side parabolic reflectors 4A 'and 4B' are all converged in a line shape at a converging point F.

FIGS. 14, 15, and 16 show claims 4 and 5.
The parabolic reflectors 4A, 4B and 4A 'connected to the tip of each of the reflectors 2A, 2A' and 2B, 2B 'described above. Four
The curvature of B'is configured differently from that shown in FIG. 13 so that the positions of the focal points F and F'of each ultrasonic wave deviate in the vertical direction or the extension line SL direction.

That is, according to the invention as set forth in claim 4 shown in FIG. 14, the focus points F, F'of the synthetic sound waves A, B and A ', B'are vertically symmetrical with respect to the extension line SL. The curvatures of the parabolic reflectors 4A, 4B and 4A ', 4B' are designed so as to be located at the position of the focal point. In the invention according to claim 5 shown in FIG. The curvature is designed so as to be located on the extension line SL so as to be displaced in the front-rear direction.
Similarly, in the invention described in claim 5, the focusing point F,
The curvature is designed so that F ′ is located above and below the extension line SL, and, in addition, is displaced in the front-rear direction, and as a result, both inventions widen the range of a strong sound field to prevent dust collection and drying. It is possible to process a wide range.

An acrylic plate having a thickness of 5 mm is used as each of the reflection plates 2A ... 4B described above, and a Langevin type vibrator is used as the vibrator 5, while a horn 5H is used.
As an exponential horn (amplitude expansion ratio of about 4.
No. 6, manufactured by Duralumin) is used, but it goes without saying that all of these are examples of implementation.

A displacement meter (S
T-3511, manufactured by IWATSU Co., is used as a 1/8 inch condenser microphone (4138) for measuring sound pressure distribution.
Type, manufactured by B & K) was used.

[0051]

As described above, according to the ultrasonic sound source using the striped mode diaphragm of the present invention, all the ultrasonic waves emitted from one side or both front and back sides of the striped mode diaphragm are emitted. The reflected sound is reflected toward the inside to form a synthetic sound wave, and the synthesized sound wave is reflected inward by the parabolic reflector without being diffused and focused in a line shape, so that an extremely strong sound field can be formed. At the same time, by using a two-point drive fringe mode diaphragm in which the length of the side parallel to the nodal line is increased, it is possible to exert the advantage of expanding the range of the strong sound field.
It is possible to provide an ultrasonic sound source having a large amount of processing and a high processing speed, which has high industrial utility value.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a basic configuration of the present invention.

FIG. 2 is a perspective view illustrating another basic configuration of the present invention.

FIG. 3 is a plan view showing a state in which a stripe mode appears on a stripe mode diaphragm used in the present invention.

FIG. 4 is a plan view illustrating a vibration mode and a state of displacement distribution of the striped mode diaphragm described in claim 6;

FIG. 5 is an explanatory diagram illustrating a situation of amplitude displacement distribution of a striped mode diaphragm.

FIG. 6 is a diagram showing a measurement result of sound pressure distribution in the x-axis direction at a radiation port.

FIG. 7 is a diagram showing a measurement result of sound pressure distribution in a y-axis direction at a radiation port.

FIG. 8 is a diagram illustrating the relationship between electric input and output sound pressure.

FIG. 9 is a configuration diagram showing a radiation direction of ultrasonic waves in a fringe mode diaphragm.

10A and 10B are configuration diagrams illustrating the reflection direction of ultrasonic waves by a reflection plate and an inclined reflection plate.

FIG. 11 is a configuration diagram illustrating a radiation angle of a synthesized ultrasonic wave radiated from a radiation port.

FIG. 12 is a configuration diagram illustrating the structure of the present invention according to claim 1;

FIG. 13 is a configuration diagram illustrating a structure of the present invention according to claims 2 and 3.

FIG. 14 is a configuration diagram illustrating the structure of the present invention according to claim 4;

FIG. 15 is a configuration diagram illustrating another example of the structure of the present invention according to claim 5;

FIG. 16 is a configuration diagram showing another example of the structure of the present invention according to claim 5 as well.

[Explanation of Codes] 1A, 1B Stripe mode diaphragm 2A, 2B, 2A ', 2B' Reflector 3A, 3B, 3A ', 3B' Inclined reflector 4A, 4B, 4A ', 4B' Parabolic reflector 5 Transducer F, F 'Focus point

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinjiro Katsushima 1-6-2 Shintoda Hamamatsu City, Shizuoka Prefecture Amano Co., Ltd. Miyakoda Techno Business Office (72) Inventor Yo Kudo 1-6 Shintoda Hamamatsu City, Shizuoka Prefecture 2 Amano Co., Ltd. Miyakoda Techno Business Office

Claims (7)

[Claims] 1. An ultrasonic sound source configured to generate an ultrasonic wave on one side surface by vibrating a rectangular diaphragm dimensioned to generate a stripe mode, the one side surface of the diaphragm. The radiation port is opened on one side of the diaphragm parallel to the nodal line of the striped mode, and the ultrasonic waves generated from one side surface of the diaphragm are reflected toward the radiation port. In addition to arranging the reflectors configured in this way, a parabolic reflector that reflects the ultrasonic waves emitted from the emission port inward and focuses it in a line is connected to the tip of this reflector. An ultrasonic sound source using a characteristic fringe mode diaphragm. 2. An ultrasonic sound source configured to generate ultrasonic waves on both front and back surfaces by vibrating a rectangular diaphragm sized to generate a striped mode,
With the front and back sides of the diaphragm aligned, the radiation ports are opened on both sides of the front and back sides of the diaphragm parallel to the nodal line of the striped mode, and ultrasonic waves generated from the front and back sides of the diaphragm are The front and back reflecting plates configured to reflect toward each of the above radiation ports are arranged side by side, and each of these reflecting plates reflects inward each ultrasonic wave emitted from the front and back radiation ports. An ultrasonic sound source using a striped mode diaphragm, which is characterized in that parabolic reflectors that converge in a line shape are connected in series. 3. The focus point of ultrasonic waves linearly focused by the parabolic reflectors connected to the front and back reflectors is set on the extension line of the diaphragm. Ultrasonic sound source using a stripe mode diaphragm. 4. The ultrasonic waves emitted from the front and back radiation ports are focused at symmetrical positions with respect to the extension line of the diaphragm by changing the curvature of the parabolic reflectors connected to the front and back reflectors. The ultrasonic sound source using the fringe mode diaphragm according to claim 2, wherein each point is focused in a line shape. 5. The ultrasonic waves radiated from the radiation ports on the front and back sides are linearly focused at different focusing points by making the curvatures of the parabolic reflections connected to the front and back reflecting plates different from each other. The ultrasonic sound source using the fringe mode diaphragm according to claim 2, wherein the ultrasonic sound source is configured as described above. 6. The length of a side parallel to a nodal line in which the fringe mode appears and the length Ly of a side perpendicular to the nodal line are the same as those of the rectangular vibration plate. Theoretical formula of bending vibration; [However, Nx: number of nodes (odd value), Ny: number of nodes (even value), λf: wavelength of bending number] is formed in a rectangular shape and is perpendicular to the nodal line of the diaphragm. At the center position with respect to the side, and with respect to the side parallel to the nodal line, it is the same antinode position from both end sides in the displacement distribution of the bending vibration.
6. The striped mode diaphragm according to claim 1, 2, 3, 4 or 5, wherein left and right vibrators are attached at left and right driving point positions where a substantially linear striped mode appears when driven. Ultrasonic sound source. 7. An ultrasonic wave emitted from the diaphragm in a direction opposite to the emission port is reflected in the direction of the emission port on one end face of each reflection plate arranged in parallel on one side surface or both front and back sides of the vibration plate. 5. A slanting reflector plate is connected in series.
An ultrasonic sound source using the striped mode diaphragm according to 4 or 5.