WO2015056451A1

WO2015056451A1 - Ultrasonic beauty instrument, voltage application method, and ultrasonic head

Info

Publication number: WO2015056451A1
Application number: PCT/JP2014/005279
Authority: WO
Inventors: 山▲崎▼　岩男
Original assignee: ヤーマン株式会社
Priority date: 2013-10-18
Filing date: 2014-10-17
Publication date: 2015-04-23
Also published as: TW201531290A

Abstract

　Provided are an ultrasonic beauty instrument, a voltage application method, and an ultrasonic head, whereby a plurality of types of treatments can be performed by a single device through use of an ultrasonic vibrator for vibrating in a primary vibration mode and a vibration mode other than the primary vibration mode. In the present invention, an ultrasonic head is used in which the vibration power at a second natural frequency is at least 30% of the vibration power at a first natural frequency, an oscillator is configured having a first oscillation mode for causing the ultrasonic head to vibrate at the first natural frequency and a second oscillation mode for causing the ultrasonic head to vibrate at the second natural frequency, and it is possible to switch to one of the first or second oscillation mode.

Description

Ultrasonic beauty instrument, voltage application method and ultrasonic head

The present invention relates to an ultrasonic beauty instrument, a voltage application method, and an ultrasonic head.

Conventionally, a beauty treatment apparatus including a first ultrasonic transducer having a predetermined natural frequency and a second ultrasonic transducer having a higher natural frequency than the first ultrasonic transducer is known. . By applying a voltage having a frequency corresponding to the natural frequency of each of the first and second ultrasonic vibrators to the first and second ultrasonic vibrators to vibrate, the skin treatment or slimming treatment Can be obtained with a single device (for example, see Patent Document 1).

JP 2007-209533 A

It is known that ultrasonic transducers have first to nth vibration modes having different natural frequencies. However, the vibration power in the second to nth vibration modes (ultrasonic transducer output strength) is smaller than the vibration power in the first vibration mode, and treatment effects are expected on the skin surface. It was difficult to give as much vibration as possible. For this reason, there is no known beauty treatment apparatus that actively uses the natural frequency of the second or higher vibration mode.

The present invention has been made to solve such problems, and a plurality of types of treatments can be performed in a single manner by an ultrasonic vibrator that vibrates in a vibration mode other than the primary vibration mode and the primary vibration mode. An object of the present invention is to provide an ultrasonic beauty instrument, a voltage application method, and an ultrasonic head that can be performed by the apparatus.

An ultrasonic beauty instrument according to an embodiment includes an ultrasonic head including an ultrasonic vibrator and a vibration plate fixed to the ultrasonic vibrator, and causes the ultrasonic head to vibrate at a first or second natural frequency. An ultrasonic beauty instrument having an oscillator for applying a voltage to the ultrasonic vibrator, wherein the ultrasonic head has a vibration power at the second natural frequency as the ultrasonic head. A first oscillation mode in which at least 30% or more of the vibration power at the natural frequency of 1 is used, and the oscillator vibrates the ultrasonic head at the first natural frequency; It is assumed that the ultrasonic head has a second oscillation mode that vibrates at a natural frequency and can be switched to one of the first and second oscillation modes.

According to the voltage application method of the embodiment, an ultrasonic head including an ultrasonic vibrator and a vibration plate fixed to the ultrasonic vibrator, and the ultrasonic head to vibrate at the first or second natural frequency. In the method for applying voltage of an ultrasonic beauty instrument comprising an oscillator that outputs a voltage of 1 to 5 and an oscillating unit that applies voltage to the ultrasonic transducer, the ultrasonic head is vibrated at the first natural frequency. In the case where the oscillator oscillates at the first frequency and the ultrasonic head vibrates at the second natural frequency, the vibration power at the second natural frequency is the first frequency. A step of causing the oscillator to oscillate at a second frequency so that the power of vibration of the ultrasonic head at a natural frequency of 1 is at least 30% or more; and a voltage output from the oscillator For vibrator And a step of pressurizing.

The ultrasonic head according to the embodiment includes an ultrasonic transducer and a vibration plate fixed to the ultrasonic transducer, has the first or second natural frequency, and has the second natural frequency. The vibration power is at least 30% or more of the vibration power at the first natural frequency.

According to the present invention, an ultrasonic beauty instrument capable of performing a plurality of types of treatments with a single device using an ultrasonic vibrator that vibrates in a vibration mode other than the primary vibration mode and the primary vibration mode, A voltage application method and an ultrasonic head can be provided.

The perspective view of the treatment apparatus 1. FIG. The figure which looked at the treatment apparatus 1 from the bottom side. FIG. 2 is a plan view showing the structure of an ultrasonic head 5. FIG. 3 is a cross-sectional view showing the internal structure of the ultrasonic head 5. The conceptual diagram which shows the power spectrum when the ultrasonic head 5 vibrates. FIG. 3 is a block diagram showing functions of a vibration control circuit board 18. The flowchart which shows operation | movement of the treatment apparatus 1. FIG.

The best mode for carrying out the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view showing a treatment apparatus 1 according to the first embodiment of the present invention. FIG. 2 is a bottom view of the treatment apparatus 1. FIG. 3A is a plan view showing the structure of the ultrasonic head 5. FIG. 3B is a cross-sectional view showing the internal structure of the ultrasonic head 5. FIG. 4 is a conceptual diagram showing a power spectrum of vibration of the ultrasonic head 5. FIG. 5 is a block diagram showing functions of the vibration control circuit board 18.

(About treatment device 1)
As shown in FIGS. 1 and 2, the treatment device 1 is a handy type ultrasonic beauty instrument. The treatment apparatus 1 includes a case 2, an ultrasonic head 5, an input operation unit 10, and a vibration control circuit board 18. The treatment device 1 can perform a beauty treatment (skin treatment) on the face or body (body) or a slimming treatment that removes subcutaneous fat from the body part with a single device. The treatment device 1 operates with a commercial power source, but operates with the power of this battery by incorporating a battery in the case 2.

The case 2 is a housing having a handling part (gripping part) 3 held by a user's hand.
Case 2 has a maximum diameter to height ratio of 2 or more. The case 2 has flat surfaces on the top and bottom. That is, the shape of the case 2 is similar to a crushed sphere. The case 2 has a flat surface 21 on which the handling part 3 is formed, a flat skin contact surface 22 which is a bottom surface on the opposite side, and a curved side surface 23 connecting the surface 21 and the skin contact surface 22.

An exposure hole 22 a is provided at a substantially central portion of the skin contact surface 22. The ultrasonic head 5 is exposed from the exposure hole 22a. It is desirable to provide a gap between the ultrasonic head 5 and the exposure hole 22a. This gap prevents the vibrating ultrasonic head 5 from coming into contact with the edge of the exposure hole 22a. As a result, it is possible to prevent the vibration of the ultrasonic head 5 from being inhibited by contacting the edge of the exposure hole 22a.
When performing a slimming treatment or a skin beautification treatment, the skin contact surface 22 contacts the target skin surface (skin surface). Therefore, the vibration of the ultrasonic head 5 can be applied to the skin surface in contact with the skin contact surface 22.

The input operation unit 10 is provided on the surface 21. The input operation unit 10 receives an input operation by a user. The “input operation” is, for example, an operation for turning on or off the main power source or driving of the ultrasonic head 5 or an operation for switching the frequency of the ultrasonic head 5. The input operation unit 10 is a touch-type liquid crystal display or a mechanical switch not shown here.
As shown in FIGS. 3A and 3B, the ultrasonic head 5 is obtained by fixing an ultrasonic transducer 52 to a metal plate 51.
When a voltage is applied to the ultrasonic transducer 52, mechanical displacement occurs in the thickness direction of the ultrasonic transducer 52 (reverse piezoelectric effect). In synchronization with the mechanical displacement of the ultrasonic transducer 52 in the thickness direction, the metal plate 51 fixed to the ultrasonic transducer 52 is pulled back and forth.

As a result, the entire ultrasonic head 5 vibrates in the thickness direction of the ultrasonic head 5 with a vibration frequency and amplitude corresponding to the applied voltage.
The ultrasonic head 5 has first to nth vibration modes. Here, the “vibration mode” is a vibration mode of the ultrasonic head 5 that appears when the ultrasonic head 5 is vibrated at a natural frequency. For example, in the vibration in the third-order mode, the vibration has a frequency three times that in the vibration in the first-order mode. For example, the ultrasonic head 5 has a natural frequency of about 1 MHz as the primary mode. For example, the ultrasonic head 5 has a natural frequency of about 3 MHz as the tertiary mode.

As shown in FIG. 4, the ultrasonic head 5 has an output strength when oscillating in the tertiary mode when the peak of the output strength (vibration power) when oscillating in the primary mode is 100%. It is designed in consideration of various factors such that the peak of the height is 30% or more of the peak of the output intensity when oscillating in at least the primary mode.
“Various elements” refer to the structure (shape, dimensions, etc.) of the metal plate 51 and the ultrasonic vibrator 52, the material constituting the metal plate 51 and the ultrasonic vibrator 52, or the electrical characteristics of the ultrasonic vibrator 52. It is.
Here, the “output strength (vibration power)” can be represented by a ratio of terminal voltages in each vibration mode of the ultrasonic head 5. That is, the “output strength” can be calculated by measuring the terminal voltage in each vibration mode of the ultrasonic head 5 and substituting it into Equation 1.
Px = 20 × log ₁₀ (Vx / V1) (1)
Px: Output strength in decibel mode (decibel value)
Vx: terminal voltage of the ultrasonic head 5 in the x-order mode V1: terminal voltage (reference voltage) of the ultrasonic head 5 in the first-order mode

(Example structure)
For example, as shown in FIGS. 3A and 3B, the metal plate 51 is formed in a cover lid shape. An iron-based alloy can be used for the metal plate 51. The diameter t2 of the metal plate 51 is 45 [mm], and the thickness t3 is 8 [mm]. On the surface 51A of the metal plate 51, a recess 51B having a depth of about 3.5 [mm] is formed. An ultrasonic transducer 52 is disposed substantially at the center of the bottom surface of the recess 51B. A flat back surface 51C that is the surface opposite to the front surface 51A is in contact with the skin surface. The back surface 51C comes into contact with the skin surface directly or through a dedicated gel or the like. The ultrasonic transducer 52 is formed in a cylindrical shape. The diameter φ of the ultrasonic transducer 52 is 25.3 [mm], and the thickness t1 is 2.3 [mm].

(Material example)
For example, the ultrasonic transducer 52 is made of titanium oxide, barium oxide, or the like. The metal plate 51 is made of a resilient stainless steel plate or copper plate, or a metal such as lightweight and hard aluminum, titanium, or duralumin. The surface of the metal plate 51 may be subjected to a surface treatment such as hard chrome plating.

(About electrical characteristics)
Table 1 shows the electrical characteristics and vibration characteristics of the ultrasonic head 5 (see samples 1 to 13 in Table 1), and the electrical characteristics and vibration of a general ultrasonic head (see Comparative Example 1 in Table 1). The characteristics are shown.

In Table 1, F1 is the natural frequency of the primary mode of the ultrasonic head 5. Z1 is the impedance of the ultrasonic head 5 when it vibrates in the primary mode. C is a capacitance component of the ultrasonic head 5. F3 is the natural frequency of the tertiary mode of the ultrasonic head 5. Z3 is the impedance of the ultrasonic head 5 when it vibrates in the third-order mode. P3 is the intensity of the output of the ultrasonic head 5 when it vibrates in the tertiary mode. Here, P3 is based on the strength of the output when vibrating in the primary mode. When the value of P3 is −10.46 [dB] or more, the peak of the output intensity of the ultrasonic head 5 when vibrating in the third-order mode is the ultrasonic wave when vibrating in the first-order mode. It becomes 30% or more of the peak of the output intensity of the head 5.

Specifically, as shown in Table 1, the ultrasonic head 5 has an output intensity (see P3 of Table 1) of −2.80 to −5.60 [dB] when it vibrates in the third-order mode. It has become. That is, the output intensity peak in the tertiary mode of the ultrasonic head 5 is 30% or more of the output intensity peak in the primary mode.
On the other hand, in the conventional ultrasonic head shown in Comparative Example 1, the value of P3 is -16.84 [dB], which is less than -10.46 [dB]. Therefore, the output strength of the ultrasonic head of Comparative Example 1 when vibrating in the tertiary mode is 30 of the output strength of the ultrasonic head of Comparative Example 1 when vibrating in the primary mode. % Or less. Specifically, it is about 15% of the output strength of the ultrasonic head of Comparative Example 1 when vibrating in the primary mode.

When designing or manufacturing the ultrasonic head 5 having the above characteristics, first, the thickness of the ultrasonic transducer 52 and the metal are matched with the natural frequency F1 of the primary mode of the conventional ultrasonic head shown in Comparative Example 1. The thickness of the plate 51 is temporarily determined. Next, in the ultrasonic head 5 having these thicknesses determined, the value of the capacitance C is appropriately adjusted so that the impedance Z3 is larger than the impedance Z1. Specifically, the capacitance C can be adjusted by changing the thickness of the ultrasonic transducer 52 (see FIG. 3B), the composition of the material constituting the ultrasonic transducer 52, and the like.
As a result, in the ultrasonic head 5, the natural frequency of the first-order mode and the third-order mode is slightly lower than that of the conventional ultrasonic head shown in Comparative Example 1, but the output when the vibration is performed in the third-order mode. Strength increases.
As described above, the ultrasonic head 5 can also effectively use the vibration in the third-order mode as compared with the first comparative example.

Next, the vibration control circuit board 18 will be described with reference to FIG. FIG. 5 is a block diagram showing functions of the vibration control circuit board 18.
As shown in FIG. 5, the vibration control circuit board 18 includes an input receiving unit 181, a primary mode oscillation unit 182, a tertiary mode oscillation unit 183, a power supply unit 184, a clock unit 185, a memory unit 186, and a control for controlling these. Part 187.
The vibration control circuit board 18 has a vibration control function for vibrating the ultrasonic head 5 in a plurality of vibration modes. Various electronic circuits such as an impedance matching circuit and an oscillation circuit functioning as an oscillator are formed on the vibration control circuit board 18 by electronic elements such as coils and capacitors.

The input receiving unit 181 detects the operation of the input operation unit 10 by the user (switch ON / OFF operation or operation of changing the frequency of the ultrasonic head 5). The input receiving unit 181 outputs a detection signal corresponding to the detected operation to the control unit 187.
The primary mode oscillation unit 182 outputs an AC signal for the primary mode that vibrates the ultrasonic head 5 in the primary mode to the power supply unit 184. The tertiary mode oscillation unit 183 generates an AC signal for the tertiary mode that causes the ultrasonic head 5 to vibrate in the tertiary mode, and outputs the AC signal to the power supply unit 184.

The power supply unit 184 is a commercial power supply for the input operation unit 10, the input reception unit 181, the primary mode oscillation unit 182, the tertiary mode oscillation unit 183, the power supply unit 184, the time measuring unit 185, the memory unit 186, the control unit 187, and the like. Or power from batteries.
The power supply unit 184 is controlled by the control unit 187 to ultrasonically oscillate an AC voltage having a frequency corresponding to the AC signal output from the primary mode oscillation unit 182 or the tertiary mode oscillation unit 183 and having a predetermined power (amplitude). Applied to the child 52.

For example, the power supply unit 184 applies an AC voltage for the primary mode of about 24V to the ultrasonic transducer 52. For example, the power supply unit 184 applies an AC voltage for the tertiary mode of about 28 to 30V. The frequency at this time is as shown in Table 1.
The time measuring unit 185 measures a predetermined time T1 and time T2. The time T1 is a time during which an alternating voltage is continuously applied to the ultrasonic transducer 52 when the ultrasonic head 5 is vibrated in the tertiary mode. The time T1 is, for example, 10 msec. The time T2 is a time during which no AC voltage is applied to the ultrasonic transducer 52 when the ultrasonic head 5 is vibrated in the tertiary mode. The time T2 is, for example, 30 msec.

In the memory unit 186, firmware, a value indicating the power of the voltage applied to the sonic transducer 52 by the power supply unit 184 (for example, a peak value), and values indicating the times T1 and T2 can be stored in advance.
The control unit 187 controls the input reception unit 181, the primary mode oscillation unit 182, the tertiary mode oscillation unit 183, the power supply unit 184, the time measurement unit 185, and the memory unit 186. For example, the control unit 187 has a switch function of inputting either the primary mode AC signal or the tertiary mode AC signal to the power source unit 184.

According to the treatment apparatus 1 configured as described above, by providing the ultrasonic head 5, the tertiary mode stronger than the vibration in the tertiary mode of the ultrasonic head of the comparative example 1 shown in Table 1 above. Can be applied to the skin surface.
Therefore, a sufficient treatment effect can be expected by using the vibration in the tertiary mode of the ultrasonic head 5. Furthermore, according to the treatment apparatus 1, by providing the ultrasonic head 5, the vibration of the primary mode can also be applied to the skin surface. That is, the treatment apparatus 1 includes the ultrasonic head 5 and can perform a plurality of types of treatments using a primary mode and a vibration mode other than the primary mode with a single apparatus.

(Description of operation)
Next, operation | movement of the treatment apparatus 1 is demonstrated using FIG. FIG. 6 is a flowchart showing the operation of the treatment apparatus 1.
(1) Detection of user operation (Yes in steps S100 and S101)
The input reception unit 181 detects the user's operation of the input operation unit 10 and outputs a corresponding detection signal to the control unit 187. For example, the input reception unit 181 outputs a detection signal indicating the start of vibration in the primary mode to the control unit 187 (Yes in step S101).

(2) Primary mode oscillation (steps S102 to S104)
In response to receiving the detection signal output from the input receiving unit 181, the control unit 187 causes the primary mode oscillation unit 182 to generate an AC signal. Primary mode oscillation unit 182 outputs the generated AC signal to power supply unit 184.
The power supply unit 184 applies an AC voltage to the ultrasonic transducer 52 based on the AC signal generated by the primary mode oscillation unit 182. As a result, the ultrasonic head 5 vibrates in the primary mode (see the natural frequency F1 in Table 1 above).

When the input reception unit 181 detects a user's stop operation, the control unit 187 controls the primary mode oscillation unit 182 and the power supply unit 184 to generate an AC signal for the primary mode and the ultrasonic transducer 52, respectively. The application of the AC voltage to is stopped (step S104). That is, the vibration of the ultrasonic head 5 stops.
The above is the vibration operation in the primary mode in the treatment apparatus 1.

(3) Start of tertiary mode operation (Steps S100, S101 No to S105)
For example, the input receiving unit 181 may output a detection signal indicating the start of vibration in the tertiary mode to the control unit 187 (No in step S101).
In response to receiving the detection signal output from the input reception unit 181, the control unit 187 causes the tertiary mode oscillation unit 183 to generate an AC signal. Further, the control unit 187 reads a value indicating the time T1 from the memory unit 186, and causes the time measuring unit 185 to measure time until the time T1 is reached.

(4) ON control of vibration of the ultrasonic head 5 (No in steps S106 to S107)
The power supply unit 184 applies an AC voltage to the ultrasonic transducer 52 based on the AC signal generated by the tertiary mode oscillation unit 183. As a result, the ultrasonic head 5 vibrates in the tertiary mode (see the natural frequency F3 in Table 1 above).
The control unit 187 continues to apply a voltage to the ultrasonic transducer 52 by the power supply unit 184 until the time measured by the time measuring unit 185 reaches time T1 (step S107). Accordingly, the ultrasonic head 5 continues to vibrate until the time T1 is reached.

(5) Stop control of the ultrasonic head 5 (Yes to S110 in Step S107)
The control unit 187 reads a value indicating the time T2 from the memory unit 186 in response to receiving the signal indicating that the timed time has reached the time T1 from the time measuring unit 185. The control unit 187 causes the time measuring unit 185 to measure time until the time T2 is reached (step S108).
The control unit 187 controls the power supply unit 184 to stop the application of voltage to the ultrasonic transducer 52 until the time measured by the time measuring unit 185 reaches time T2 (step S109).

As a result, the ultrasonic head 5 does not vibrate while the time measuring unit 185 is measuring the time T2. The control unit 187 repeats the processing from Step S101 to Step S110 until the user performs a stop operation or the input reception unit 181 detects an operation indicating the start of vibration in the primary mode (No in Step S111). .
When the input reception unit 181 detects a user's stop operation, the control unit 187 controls the tertiary mode oscillation unit 183 and the power supply unit 184 to generate an AC signal for the tertiary mode and to the ultrasonic transducer 52, respectively. The application of the alternating voltage is stopped (step S104). That is, the ultrasonic head 5 stops.

As described above, according to the treatment apparatus 1, when the ultrasonic head 5 is vibrated in the tertiary mode, an alternating voltage is intermittently applied to the ultrasonic transducer 52. Thereby, the heat generation of the ultrasonic vibrator 52 and the temperature rise after the heat generation can be reduced.
When the ultrasonic head 5 vibrates in the tertiary mode, the output strength is 30% or more of the output strength when the ultrasonic head 5 vibrates in the primary mode. Can give the stimulus of vibration.

(Example of how to use treatment device 1)
The user operates the input receiving unit 181 to vibrate the ultrasonic head 5 in the primary mode. Then, the user lightly presses the surface of the ultrasonic head 5 against the skin surface, and moves the ultrasonic head 5 along the skin surface so as to draw a circle slowly in close contact. At this time, when the ultrasonic head 5 strikes the skin surface, the deep layer portion of the skin generates heat. As a result, a subcutaneous lipolysis effect can be expected.
Further, the user can operate the input receiving unit 181 to vibrate the ultrasonic head 5 in the tertiary mode. Then, the tip surface of the ultrasonic head 5 is lightly pressed against the skin surface, and the ultrasonic head 5 is moved along the skin surface so as to draw a circle slowly in close contact with the skin surface.

As a result, the ultrasonic head 5 that vibrates at a frequency higher than that of the primary mode and 30% or more of the output intensity in the primary mode strikes the skin surface. As a result, the effect of cleaning the skin surface according to the following (1) to (3) can be expected. By cleaning the skin, acne can be expected to heal.
(1) The skin surface layer is sterilized. (2) Wastes, stratum corneum, etc. peel from the skin. (3) Oil stains or makeup residues are removed from the pores.
Moreover, the skin beautifying effect by the following (4) and (5) can also be expected.
(4) Blood circulation on the skin surface layer, which is a part near (shallow) the epidermis, is promoted. This activates the cells. As a result, it can be expected that the skin spots are removed. (5) Muscle tension is relaxed. As a result, it can be expected that wrinkles and sagging of the skin are improved.
When the treatment apparatus 1 is used, it is desirable to apply a medium such as cream or gel to the treatment target site or the surface of the ultrasonic head 5 to improve the propagation efficiency of ultrasonic waves.

(Modification)
Although the first embodiment of the present invention has been specifically described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.
For example, assuming that the treatment apparatus 1 is used in a bathroom or the like, the skin contact surface 22 may not be provided with the exposure hole 22a. In this case, for example, in the case 2, it is desirable to attach the ultrasonic head 5 to the skin contact surface 22 and vibrate the skin contact surface 22 by the vibration of the ultrasonic head 5. In this case, the vibration of the skin contact surface 22 can be applied to the skin surface. In this case, it is desirable to connect the skin contact surface 22 and the side surface 23 via an elastic body such as rubber so that the skin contact surface 22 is easily vibrated.

For example, in the treatment apparatus 1, the ultrasonic head 5 is vibrated in the primary mode or the tertiary mode, but is vibrated in the primary mode or the fifth mode, or is vibrated in the tertiary mode or the fifth mode. Also good. That is, the combination of vibration modes is not particularly limited.
For example, the case 2 may be formed in a rectangular parallelepiped shape or a pyramid shape.

For example, the electrical characteristics of the ultrasonic head 5 may be equivalent to the comparative example shown in Table 1 described above. In this case, when the ultrasonic head 5 is vibrated in the third-order mode, an AC voltage that produces an output strength of 30% or more of the output strength when the ultrasonic head 5 is vibrated in the first-order mode is ultrasonically vibrated. Applied to the child 52. In this case, the ultrasonic vibrator 52 is likely to generate heat. However, as shown in FIG. 6, by intermittently applying an AC voltage to the ultrasonic vibrator 52, the ultrasonic vibrator 52 generates heat or has been heated. Temperature rise can be prevented.

DESCRIPTION OF SYMBOLS 1 ... Treatment apparatus, 2 ... Case, 3 ... Handling part, 5 ... Ultrasonic head, 10 ... Input operation part, 18 ... Vibration control circuit board, 181 ... Input reception part, 182 ... Primary mode oscillation part, 183 ... 3 Next mode oscillation unit, 184 ... power supply unit, 185 ... timing unit, 186 ... memory unit, 187 ... control unit, 21 ... surface, 22 ... skin contact surface, 22a ... exposed hole, 23 ... side surface, 51 ... metal plate, 51A ... front surface, 51B ... concave portion, 51C ... back surface, 52 ... ultrasonic transducer.

Claims

An ultrasonic head including an ultrasonic vibrator and a diaphragm fixed to the ultrasonic vibrator; and an oscillator for vibrating the ultrasonic head at a first or second natural frequency. In an ultrasonic beauty instrument comprising an oscillating unit for applying a voltage to a vibrator,
The ultrasonic head has a vibration power at the second natural frequency of at least 30% or more of the vibration power at the first natural frequency, and the oscillator has the first A first oscillation mode in which the ultrasonic head is vibrated at the natural frequency and a second oscillation mode in which the ultrasonic head is vibrated at the second natural frequency. Ultrasonic beauty device that can be switched to one of the oscillation modes.
2. The ultrasonic beauty instrument according to claim 1, wherein when the ultrasonic head is vibrated at the second natural frequency, the voltage is intermittently applied to the ultrasonic transducer.
The power of the vibration is a terminal voltage when the ultrasonic vibrator vibrates at the first natural frequency and a terminal voltage when the ultrasonic vibrator vibrates at the second natural frequency. The ultrasonic beauty instrument according to claim 1 or 2 expressed based on a ratio.
An ultrasonic head including an ultrasonic vibrator and a diaphragm fixed to the ultrasonic vibrator; and an oscillator that outputs a voltage for causing the ultrasonic head to vibrate at the first or second natural frequency. In the voltage application method of the ultrasonic beauty instrument comprising an oscillating unit for applying a voltage to the ultrasonic vibrator,
The oscillator oscillates at a first frequency when the ultrasonic head is vibrated at the first natural frequency; and
When the ultrasonic head is vibrated at the second natural frequency, the vibration power at the second natural frequency is at least the vibration power of the ultrasonic head at the first natural frequency. The oscillator oscillates at a second frequency so as to be 30% or more;
Applying a voltage output from the oscillator to the ultrasonic transducer.
The voltage application method according to claim 4, wherein when the ultrasonic head is vibrated at the second natural frequency, the oscillator intermittently applies the voltage to the ultrasonic transducer.
The power of the vibration is a terminal voltage when the ultrasonic vibrator vibrates at the first natural frequency and a terminal voltage when the ultrasonic vibrator vibrates at the second natural frequency. The voltage application method according to claim 4 or 5 expressed based on a ratio.
In an ultrasonic head comprising an ultrasonic transducer and a diaphragm fixed to the ultrasonic transducer and having a first or second natural frequency,
The ultrasonic head, wherein the vibration power at the second natural frequency is at least 30% or more of the vibration power at the first natural frequency.
The power of the vibration is a terminal voltage when the ultrasonic vibrator vibrates at the first natural frequency and a terminal voltage when the ultrasonic vibrator vibrates at the second natural frequency. The ultrasonic head according to claim 7 expressed based on a ratio.