Ultrasonic generator

Abstract

To provide an ultrasonic generator that can improve the skin quality of a person's face without causing them any pain. [Solution] The ultrasonic generator comprises an intermittent signal generation unit that generates intermittent signals, an ultrasonic generator that generates ultrasonic waves by vibrating using the intermittent signals generated by the intermittent signal generation unit as energy, and a control unit that controls the intermittent signals by controlling the intermittent signal generation unit and controls the sound pressure of the ultrasonic waves generated by the ultrasonic generator unit, wherein the control unit controls the intermittent signal generation unit so that the sound pressure of the ultrasonic waves is within the range of 0.11 MPa to 0.21 MPa.

Description

Technical Field

[0001] The present disclosure relates to an ultrasonic generator.

Background Art

[0002] As disclosed in Patent Document 1 below, development of an ultrasonic generator that irradiates a person with ultrasonic waves for treatment has been carried out. This ultrasonic generator irradiates a person's brain with ultrasonic waves in order to treat dementia. Thereby, in Patent Document 1, it is disclosed that there is a possibility that dementia can be treated by angiogenesis occurring in the brain.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, there has been a need to improve the skin quality of a person's face. Therefore, the inventors of the present application examined whether the effect of ultrasonic irradiation used in the treatment of the above-mentioned dementia in a person can be utilized for improving the skin quality of a person's face. However, since the sound pressure of the ultrasonic waves generated by the ultrasonic generator disclosed in Patent Document 1 above is too high, when that ultrasonic wave is irradiated on a person's facial skin, the person will feel pain in the facial skin.

[0005] The present disclosure has been made in view of the above problems. An object of the present disclosure is to provide an ultrasonic generator that can improve the skin quality of a person's face while suppressing the feeling of pain in the person's facial skin.

Means for Solving the Problems

[0006] The ultrasonic generator of this disclosure comprises: an intermittent signal generation unit that generates an intermittent signal; an ultrasonic generator that generates ultrasonic waves by vibrating using the intermittent signal generated by the intermittent signal generation unit as energy; and a control unit that controls the intermittent signal by controlling the intermittent signal generation unit and controls the sound pressure of the ultrasonic waves generated by the ultrasonic generator unit, wherein the control unit controls the intermittent signal generation unit so that the sound pressure of the ultrasonic waves is within the range of 0.11 MPa to 0.21 MPa. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic diagram of the ultrasonic generator according to the embodiment. [Figure 2] This figure illustrates a method for measuring the sound pressure of ultrasonic waves generated by an ultrasonic transducer in an ultrasonic generator according to an embodiment. [Figure 3] This diagram illustrates the intermittent signals generated by the intermittent signal generation unit of the ultrasonic generator according to this embodiment. [Figure 4] This figure illustrates the characteristics of the intermittent signals generated by the intermittent signal generation unit of the ultrasonic generator according to this embodiment. [Figure 5] This figure shows the amount of change in capillaries in the skin when irradiated with ultrasound by the ultrasound generator of the embodiment. [Figure 6] This diagram shows the relationship between skin moisture, skin elasticity, and ultrasound frequency. [Figure 7] This is a photograph showing the condition of the skin before ultrasound treatment. [Figure 8] This is a photograph showing the condition of the skin after ultrasound irradiation. [Figure 9] These are skin photographs used as a standard for scoring skin texture. [Figure 10] This diagram shows the area of ​​skin to which ultrasound waves are applied. [Figure 11] This diagram shows the relationship between the frequency of the ultrasound, the ultrasound irradiation power (sound pressure), and the subject. [Figure 12]This figure shows the density of capillaries when the ultrasonic frequency is 1.0 MHz and the irradiation power (sound pressure) is 0.11 MPa. [Figure 13] This figure shows the difference in capillary density when the ultrasonic frequency is 1.0 MHz and the irradiation power (sound pressure) is 0.11 MPa. [Figure 14] This figure shows the density of capillaries when the ultrasonic frequency is 2.4 MHz and the irradiation power (sound pressure) is 0.11 MPa. [Figure 15] This figure shows the difference in capillary density when the ultrasound frequency is 2.4 MHz and the irradiation power (sound pressure) is 0.11 MPa. [Figure 16] This figure shows the density of capillaries when the ultrasonic frequency is 5.0 MHz and the irradiation power (sound pressure) is 0.11 MPa. [Figure 17] This figure shows the difference in capillary density when the ultrasound frequency is 5.0 MHz and the irradiation power (sound pressure) is 0.11 MPa. [Figure 18] This figure shows the density of capillaries when the ultrasonic frequency is 1.0 MHz and the irradiation power (sound pressure) is 0.16 MPa. [Figure 19] This figure shows the difference in capillary density when the ultrasonic frequency is 1.0 MHz and the irradiation power (sound pressure) is 0.16 MPa. [Figure 20] This figure shows the density of capillaries when the ultrasonic frequency is 2.4 MHz and the irradiation power (sound pressure) is 0.16 MPa. [Figure 21] This figure shows the difference in capillary density when the ultrasonic frequency is 2.4 MHz and the irradiation power (sound pressure) is 0.16 MPa. [Figure 22] This figure shows the density of capillaries when the ultrasonic frequency is 1.0 MHz and the irradiation power (sound pressure) is 0.21 MPa. [Figure 23]This is a diagram showing the difference in capillary density when the ultrasonic frequency is 1.0 MHz and the irradiation power (sound pressure) is 0.21 Mpa. [Figure 24] This is a diagram showing the capillary density when the ultrasonic frequency is 2.4 MHz and the irradiation power (sound pressure) is 0.21 Mpa. [Figure 25] This is a diagram showing the difference in capillary density when the ultrasonic frequency is 2.4 MHz and the irradiation power (sound pressure) is 0.21 Mpa. [Figure 26A] Figure 1 showing the relationship between the average, standard deviation, difference, and increase rate of capillaries when the ultrasonic frequency is 1.0 MHz. [Figure 26B] Figure 2 showing the relationship between the average, standard deviation, difference, and increase rate of capillaries when the ultrasonic frequency is 1.0 MHz. [Figure 26C] Figure 3 showing the relationship between the average, standard deviation, difference, and increase rate of capillaries when the ultrasonic frequency is 1.0 MHz. [Figure 27A] Figure 1 showing the relationship between the average, standard deviation, difference, and increase rate of capillaries when the ultrasonic frequency is 2.4 MHz. [Figure 27B] Figure 2 showing the relationship between the average, standard deviation, difference, and increase rate of capillaries when the ultrasonic frequency is 2.4 MHz. [Figure 27C] Figure 3 showing the relationship between the average, standard deviation, difference, and increase rate of capillaries when the ultrasonic frequency is 2.4 MHz. [Figure 28] This is a diagram showing the relationship between the average, standard deviation, difference, and increase rate of capillaries when the ultrasonic frequency is 5.0 MHz.

Mode for Carrying Out the Invention

[0008] Hereinafter, an ultrasonic generator and its operation method according to an embodiment of the present disclosure will be described with reference to the drawings. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant descriptions will not be repeated.

[0009] Figure 1 is a schematic diagram of the ultrasonic generator 10 of this embodiment.

[0010] As shown in Figure 1, the ultrasonic generator 10 comprises an intermittent signal generation unit 1, an ultrasonic generation unit 2, a control unit 3, and an operation unit 4.

[0011] The intermittent signal generation unit 1 includes an electrical circuit that generates an intermittent signal. This electrical circuit includes, for example, a high-frequency circuit whose output turns ON at a constant period and generates a signal of a specific frequency while it is ON. More specifically, this electrical circuit generates a waveform that is ON for 1 second (repeatedly turning ON / OFF at a frequency of 1 MHz during that time) and then completely OFF (no vibration) for 1 second. The ultrasonic generation unit 2 generates ultrasound by vibrating using the intermittent signal generated by the intermittent signal generation unit 1 as energy.

[0012] The ultrasonic generating unit 2 includes a disc-shaped ultrasonic transducer 2A. However, the shape of the ultrasonic transducer 2A is not limited to a disc shape. As the material of the ultrasonic transducer, for example, acrylic resin (PMMA), polyetherimide resin (PEI), polystyrene resin (PS), or piezoelectric ceramics can be used. A disc-shaped gel 2B is attached to the disc-shaped ultrasonic transducer 2A. However, lotion or a cotton puff may be used instead of the gel 2B. The ultrasonic transducer 2A is pressed against the skin of a person's face F with the gel 2B in between the ultrasonic transducer 2A and the skin F of the person's face. In this state, the ultrasonic waves generated by the ultrasonic generating unit 2 are irradiated onto the skin of the face F.

[0013] The control unit 3 controls the intermittent signal by controlling the intermittent signal generation unit 1, thereby controlling the sound pressure of the ultrasound generated by the ultrasound generation unit 2. The control unit 3 controls the intermittent signal generation unit 1 so that the sound pressure of the ultrasound is within the range of 0.11 MPa to 0.21 MPa. The value of the sound pressure of the ultrasound may be constant or change as long as it is within the range of 0.11 MPa to 0.21 MPa. The control unit 3 controls the intermittent signal generation unit 1 by using a memory that stores a program and by executing the aforementioned program.

[0014] The operation unit 4 controls the intermittent signals generated by the intermittent signal generation unit 1 to control the ultrasonic waves generated by the ultrasonic wave generation unit 2. The operation unit 4 includes a sound pressure operation unit 4A, a frequency operation unit 4B, a pulse width operation unit 4C, and a repeating pulse width operation unit 4D. Each of the sound pressure operation unit 4A, frequency operation unit 4B, pulse width operation unit 4C, and repeating pulse width operation unit 4D is operated by the user. As a result, a command signal that can specify the value identified by the operation of each of the sound pressure operation unit 4A, frequency operation unit 4B, pulse width operation unit 4C, and repeating pulse width operation unit 4D is transmitted from the operation unit 4 to the control unit 3. When the control unit 3 receives the command signal from the operation unit 4, it causes the intermittent signal generation unit 1 to generate an intermittent signal based on the command signal.

[0015] Specifically, the intermittent signal generation unit 1 generates an intermittent signal so that the ultrasonic generation unit 2 generates an ultrasonic wave with a sound pressure value specified by the operation of the sound pressure operation unit 4A. The intermittent signal generation unit 1 also generates an intermittent signal with a frequency value specified by the operation of the frequency operation unit 4B. The intermittent signal generation unit 1 also generates an intermittent signal with a pulse width specified by the operation of the pulse width operation unit 4C. The intermittent signal generation unit 1 also generates an intermittent signal with a repeating pulse width specified by the operation of the repeating pulse width operation unit 4D. In this embodiment, the sound pressure operation unit 4A, frequency operation unit 4B, pulse width operation unit 4C, and repeating pulse width operation unit 4D are each independent operation units that individually control the sound pressure, frequency, pulse width, and repeating pulse width of the ultrasonic wave. However, the sound pressure, frequency, pulse width, and repeating pulse width of the ultrasonic wave may be operated collectively by a single operation unit.

[0016] Next, we will explain how the above-described ultrasonic generator 10 can be used to improve human skin F.

[0017] Blood vessels run beneath the dermis layer of the skin on a person's face (F). Capillaries branch off from these blood vessels. Blood vessels are composed of the intima, media, and adventitia. When high-intensity ultrasound, a type of shock wave, is applied to the endothelial cells within the intima, NOS (nitric oxide synthase) is activated. This causes new capillaries to form in the skin of a person's face (F).

[0018] If the ultrasonic sound pressure is less than 0.11 MPa, the amount of new capillaries formed inside the skin of the person's face F will be small, and the desired improvement in the skin quality of the person's face F will not be achieved. On the other hand, if the ultrasonic sound pressure is greater than 0.21 MPa, the amount of new capillaries formed inside the skin of the person's face F will increase, but the person's face F will feel pain. From these points, it can be said that if the ultrasonic sound pressure is within the range of 0.11 MPa to 0.21 MPa, it is possible to improve the skin quality of the person's face F while suppressing the feeling of pain on the person's face F. In other words, the ultrasonic generator 10 of this embodiment is particularly suitable for improving the properties of sensitive skin such as the skin of a person's face F.

[0019] For the reasons stated above, it is preferable that the ultrasonic generator 10 of this embodiment is equipped with a sound pressure control unit 4A configured to change the ultrasonic sound pressure within a range of 0.11 MPa to 0.21 MPa. This allows the intensity of the ultrasonic sound pressure to be adjusted according to the user's preference within a range that can improve the skin quality of the person's face F while suppressing the sensation of pain on the skin of the person's face F.

[0020] Figure 2 is a diagram illustrating a method for measuring the sound pressure of the ultrasonic waves generated by the ultrasonic transducer 2A of the ultrasonic generator 10 according to the embodiment.

[0021] As shown in Figure 2, with the ultrasonic transducer 2A submerged in water, the water tank is placed on a weighing scale WS. The ultrasonic sound pressure value is measured by reading the weight of the water tank WT when the ultrasonic transducer 2A is vibrated in the water within the tank WT. The ultrasonic sound pressure values ​​of 0.11 MPa to 0.21 MPa mentioned above were measured using the method shown in Figure 2.

[0022] Figure 3 is a diagram illustrating the intermittent signals generated by the intermittent signal generation unit 1 of the ultrasonic generator 10 according to this embodiment.

[0023] As shown in Figure 3, it is preferable that the control unit 3 in this embodiment controls the intermittent signal generation unit 1 so that the frequency FR of the intermittent signal is within the range of 1.0 MHz to 5.0 MHz. If the frequency FR of the intermittent signal is less than 1.0 MHz, the ultrasound will reach a position too deep from the surface of the skin of a person's face F, for example, a position deeper than 3 mm from the surface of the skin of a person's face F. Therefore, it is preferable to control the frequency FR of the intermittent signal to a value of 1.0 MHz or higher so that the ultrasound is irradiated to an appropriate depth position within 3 mm from the surface of the skin of a person's face F.

[0024] On the other hand, even if the frequency FR of the intermittent signal is greater than 5.0 MHz, ultrasound can reach a depth of within 3 mm from the surface of the skin on a person's face F where capillaries are present. However, the ON / OFF switching speed of the switching element required to generate the intermittent signal in the intermittent signal generation unit 1 becomes greater than the switching capacity of the switching element. Increasing the size of the switching element can increase the switching speed of the switching element. However, if the switching element is too large, the size of the ultrasound generator 10 cannot be made suitable for a portable ultrasound generator 10. In other words, the size of the ultrasound generator 10 becomes too large to be suitable for a portable ultrasound generator 10. Also, because of the high-speed switching, the frequency generation efficiency decreases, leading to increased power loss and heat generation. Therefore, it is preferable to control the frequency FR of the intermittent signal to a value of 5.0 MHz or less so that the ultrasound can reach a depth of within 3 mm from the surface of the skin on a person's face F where capillaries are present using the portable ultrasound generator 10.

[0025] As can be seen from the above, the frequency FR of the intermittent signal only needs to be within the range of 1.0 MHz to 5.0 MHz. In this case, the ultrasound generated by the intermittent signal can be delivered to a position at an appropriate depth from the surface of the skin of a person's face F by an ultrasound generator 10 that is of a size suitable for a person to hold in their hand.

[0026] Therefore, the ultrasonic generator 10 of this embodiment is equipped with a frequency control unit 4B configured to change the frequency FR of the intermittent signal within the range of 1.0 MHz to 5.0 MHz. This allows the ultrasonic frequency FR to be adjusted according to the user's preference within a range that can improve the skin quality of a person's face F while suppressing the sensation of pain on the skin of the face F.

[0027] Furthermore, it is preferable that the control unit 3 in this embodiment controls the intermittent signal generation unit 1 so that the pulse width PW of the intermittent signal is within the range of 64 μs to 320 μs. This makes it possible to generate an intermittent signal with a pulse width PW suitable for improving the skin quality of the human face F by promoting the regeneration of capillaries in the skin of the human face F, while suppressing the sensation of pain in the skin of the human face F.

[0028] Therefore, the ultrasonic generator 10 of this embodiment is equipped with a pulse width control unit 4C configured to change the pulse width PW of the intermittent signal within a range of 64 μs to 320 μs. This allows the ultrasonic pulse width PW to be adjusted according to the user's preference within a range that can improve the skin quality of a person's face F while suppressing the sensation of pain on the skin of the person's face F.

[0029] Furthermore, it is preferable that the control unit 3 in this embodiment controls the intermittent signal generation unit so that the repeating pulse width PW of the intermittent signal is 70.4 μs or more. If the repeating pulse width PW of the intermittent signal is less than 70.4 μs, pain will be felt on the skin of the person's face F. However, if the repeating pulse width PW of the intermittent signal is 70.4 μs or more, it is possible to improve the skin quality of the person's face F by promoting the regeneration of capillaries within the skin of the person's face F, while suppressing the feeling of pain on the skin of the person's face F.

[0030] Furthermore, it is preferable that the control unit 3 controls the repeating pulse width RPW of the intermittent signal to a value of 352 μs or less, for example, in the case of 5 minutes of ultrasonic irradiation to the skin of a person's face F. The repeating pulse width RPW of the intermittent signal is expressed in terms of total time. In this case, if the ultrasonic irradiation to the skin of a person's face F is 10 minutes, including a total of 5 minutes of rest, the repeating pulse width RPW of the intermittent signal may be a little smaller.

[0031] Therefore, the ultrasonic generator 10 of this embodiment is equipped with a repeating pulse width control unit 4D configured to change the repeating pulse width RPW of the intermittent signal to a value of 70.4 μs or more. This allows the user to adjust the repeating pulse width RPW of the ultrasound according to their preference, within a range that can improve the skin quality of a person's face F while suppressing the sensation of pain on the skin of the face F.

[0032] Figure 4 is a diagram illustrating the characteristics of the intermittent signals generated by the intermittent signal generation unit 1 of the ultrasonic generator 10 in this embodiment.

[0033] In the ultrasonic generator 10 of this embodiment, when the ultrasonic frequency was 1.0 MHz, 2.4 MHz, and 5.0 MHz, ultrasonic waves were irradiated onto the skin F of a person's face with the cycle time, 32 cycle time, intermittent time, and pulse period shown in Figure 4.

[0034] Figure 5 shows the amount of change in capillaries in the skin when irradiated with ultrasound by the ultrasound generator 10 of the embodiment.

[0035] Figure 5 shows that the number of capillaries in the facial skin F of a person one week after ultrasound irradiation is generally increased compared to the facial skin F of a person who did not receive ultrasound irradiation.

[0036] Figure 6 shows the relationship between the moisture content of skin F, the elasticity of skin F, and the frequency of ultrasound.

[0037] Figure 6 shows that although the moisture content of skin F may decrease, the elasticity of skin F increases compared to when ultrasound is not applied, regardless of whether the ultrasound sound pressure is 0.11 MPa, 0.16 MPa, or 0.21 MPa.

[0038] Figure 7 is a photograph showing the condition of skin F before ultrasound irradiation. Figure 8 is a photograph showing the condition of skin F after ultrasound irradiation. Comparing Figure 7 and Figure 8, it can be seen that skin F after ultrasound irradiation has a higher skin texture score than skin F before ultrasound irradiation.

[0039] Figure 9 shows a photograph of skin that serves as a reference for scoring skin texture. The target skin F is scored based on the skin condition shown in Figure 9.

[0040] Based on the above premise, we confirmed that when ultrasound generated by an intermittent signal was irradiated onto the skin of face F, the following effects were obtained compared to when ultrasound generated by an intermittent signal was not irradiated onto the skin of face F.

[0041] The number of capillaries in the skin of face F increased by up to 2.97 times. The moisture content of the skin of face F increased by up to 7.7%. The elasticity of the skin of face F increased by up to 7.3%. The texture score of the skin of face F increased from 3 to 7. Here, texture refers to the unevenness of the skin.

[0042] The number of capillaries in face F was measured using a high-magnification camera (0.75mm vertical, 1mm horizontal, 0.75mm area). 2 After counting using ), the area is 1 mm 2 The number of capillaries per unit area was calculated. The skin moisture value of face F is the moisture content (in %) measured by a skin texture meter. The skin elasticity value and skin oil content value of face F are the oil content (in %) measured by a skin texture meter. The skin texture score was obtained by visual evaluation and scoring from skin texture score images provided by FANCL Corporation. The number of capillaries and skin texture score of face F were evaluated using the TOKU Capillaro blood flow scope from Toku Co., Ltd. The skin moisture value and skin elasticity value of face F were evaluated using the Skin Checker (skin texture meter) from NAKAGAMI Co., Ltd. The skin texture score image of face F was an image disclosed in a patent of FANCL Corporation (Figure 7 of Patent 6703218: Title of Invention "Method for Evaluating Skin Condition", Patent Holder "FANCL CORP").

[0043] The mechanism of capillary neovascularization (by LIPUS (Low-Intensity Pulsed Ultrasound)) is disclosed in a paper published by Tohoku University on March 2, 2021, titled "Discovery of angiogenesis by ultrasound therapy."

[0044] The following describes the experimental methods and results in more detail.

[0045] Figure 10 shows the area of ​​skin to which ultrasound is applied.

[0046] As shown in Figure 10, ultrasound was applied to four locations: the upper part U, the lower part L, the outer part O, and the inner part I. Over a period of seven weeks, six subjects, A through F, were subjected to ultrasound at different frequencies and power levels. Specifically, subjects A through F were subjected to ultrasound for five minutes each, three times a week on Mondays, Wednesdays, and Fridays, and their skin was photographed on Fridays. A corresponding photograph of the right cheek was also taken for comparison in a control experiment. At this time, using a capillary angiography camera, three photographs were taken for each subject at four locations on the left and right sides of their face (the number of locations varied by subject), and the number of newly formed capillaries in each photograph was counted. Subsequently, the average value of the capillary values ​​obtained from the three photographs was calculated. Simultaneously with the capillary angiography camera, the moisture and oil content were measured three times at four locations on the left and right sides of each subject's face (the number of locations varied by subject) using a skin checker, and the average value obtained from these three measurements was calculated.

[0047] Figure 11 shows the relationship between the frequency of the ultrasound, the ultrasound irradiation power (sound pressure), and the subject.

[0048] As shown in Figure 11, ultrasonic irradiation experiments were conducted on subjects A to F under the conditions of ultrasonic irradiation power (sound pressure) of 0.11 MPa, 0.16 MPa, and 0.21 MPa, and ultrasonic transducer frequencies of 1.0 MHz, 2.4 MHz, and 5.0 MHz. Note that when the ultrasonic irradiation power (sound pressure) was 0.16 MPa or 0.21 MPa and the ultrasonic transducer frequency was 5.0 MHz, measurements could not be taken due to a problem with the amplifier in the intermittent signal generation unit 1.

[0049] Figures 12 to 28 are graphs showing the results of experiments conducted using the method described above.

[0050] Figures 12 to 28 show that when the ultrasound irradiation power (sound pressure) is within the range of 0.11 MPa to 0.21 MPa, for example, the capillary density of subject A increases. In other words, when the ultrasound irradiation power (sound pressure) is within the range of 0.11 MPa to 0.21 MPa, it can be understood that subject A's skin quality improves. Furthermore, from the shape of the graphs, it can be inferred that subjects B and C also experienced improvements in skin quality, similar to subject A.

[0051] Furthermore, it can be seen that when the ultrasound frequency is within the range of 1.0 MHz to 5.0 MHz, the capillary density of both subjects D and E has increased compared to the initial state. In other words, it can be understood that when the ultrasound irradiation power (sound pressure) is within the range of 0.11 MPa to 0.21 MPa, the skin quality of both subjects D and E has improved. In addition, from the shape of the graph, it can be estimated that subject F's skin quality has improved, similar to subjects D and E. [Explanation of symbols]

[0052] 1. Intermittent signal generation unit 2. Ultrasonic generating unit 3. Control Unit 4A Sound pressure control unit 4B Frequency operation section 4C Pulse width control unit 4D Repeating Pulse Width Control Unit

Claims

1. An intermittent signal generation unit that generates intermittent signals, An ultrasonic generating unit generates ultrasonic waves by vibrating using the intermittent signals generated by the intermittent signal generating unit as energy, The system includes a control unit that controls the intermittent signal by controlling the intermittent signal generation unit, thereby controlling the sound pressure of the ultrasonic waves generated by the ultrasonic wave generation unit, The control unit controls the intermittent signal generation unit so that the sound pressure of the ultrasonic waves is within the range of 0.11 MPa to 0.21 MPa. Ultrasonic generator.

2. The system further includes a sound pressure control unit configured to change the sound pressure of the ultrasonic waves within a range of 0.11 MPa to 0.21 MPa. The ultrasonic generator according to claim 1.

3. The control unit controls the intermittent signal generation unit so that the frequency of the intermittent signal is within the range of 1.0 MHz to 5.0 MHz. The ultrasonic generator according to claim 1.

4. The system further includes a frequency control unit configured to change the frequency of the intermittent signal within the range of 1.0 MHz to 5.0 MHz. The ultrasonic generator according to claim 3.

5. The control unit controls the intermittent signal generation unit so that the pulse width of the intermittent signal is within the range of 64 μs to 320 μs. The ultrasonic generator according to claim 1.

6. The system further includes a pulse width control unit configured to change the pulse width of the intermittent signal within a range of 64 μs to 320 μs. The ultrasonic generator according to claim 5.

7. The control unit controls the intermittent signal generation unit so that the repeating pulse width of the intermittent signal is 70.4 μs or more. The ultrasonic generator according to claim 1.

8. The system further includes a repeating pulse width control unit configured to change the repeating pulse width of the intermittent signal to 70.4 μs or more. The ultrasonic generator according to claim 7.

9. A method for operating an ultrasonic generator comprising an intermittent signal generation unit, an ultrasonic generation unit, and a control unit, The steps include: causing the intermittent signal generation unit to generate an intermittent signal; The steps include generating ultrasonic waves in the ultrasonic generating unit, which vibrates using the intermittent signals generated by the intermittent signal generating unit as energy, The steps include controlling the sound pressure of the ultrasonic waves generated by the ultrasonic wave generating unit by controlling the intermittent signal by the control unit, In the step of controlling the sound pressure of the ultrasonic waves, the control unit is instructed to control the intermittent signal generation unit so that the sound pressure of the ultrasonic waves is within the range of 0.11 MPa to 0.21 MPa. How to operate an ultrasonic generator.

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