JP2000334019A - Ultrasonic beauty culture apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain comfortable massage effects. SOLUTION: An ultrasonic beauty culture apparatus comprises a probe having a metallic part that comes in contact with a skin by one surface of the metallic part and has a piezoelectric element 11 to be stuck to another surface of the metallic part; an oscillator 121 for generating signals of a ultrasonic frequency; and a drive circuit 122 for power-amplifying the output signal. Further, the ultrasonic beauty culture apparatus comprises an oscillation drive circuit 12 for supplying high frequency electric power to the piezoelectric element 11 for generating ultrasonic vibrations by the piezoelectric element 11; a detecting circuit 13 for detecting the output fluctuation of the piezoelectric element 11, for example, fluctuation of supply power to the piezoelectric element 11; and a control circuit 14 for controlling the output from the oscillation drive circuit 12 so as to maintain the output of the piezoelectric element 11 constant according to the detected results.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic cosmetic device for massaging skin using ultrasonic vibration.

[0002]

2. Description of the Related Art Conventionally, various cosmetic and therapeutic devices utilizing ultrasonic waves are commercially available and have been proposed.

[0003] For example, Japanese Utility Model Publication No. 3-35316 discloses a warning indicator lamp AC source having a frequency different from that of the ultrasonic guide AC source, and having an output state simultaneously with the ultrasonic guide AC source. Coupling means for superimposing the output of the ultrasonic source AC source and the output of the warning indicator AC source; and the frequency component of the warning indicator AC source provided from the output of the coupling means, provided on the ultrasonic guide. There is described an ultrasonic treatment device that includes a frequency extracting unit that extracts the signal and supplies the extracted signal to a warning indicator light to reduce the weight of the cable.

Japanese Patent Application Laid-Open No. 9-248213 discloses a sensor for detecting when the contact movement of the ultrasonic head on the living body surface is stopped, a sensor for detecting the stop, and a head stop signal output from the sensor. A beauty / slimming device using an ultrasonic wave, which includes a control circuit for attenuating or stopping an ultrasonic stimulus emitted from an ultrasonic head based on the output, is disclosed.

[0005]

However, in particular,
In the case of an ultrasonic cosmetic device having a metal part whose one surface is a skin contact surface and a probe having a piezoelectric element bonded to another surface of the metal part, the piezoelectric element has a skin contact with the skin contact surface. There is a characteristic that the impedance varies depending on the state, and the variation in the characteristic changes the acoustic output acting on the skin from the piezoelectric element via the metal part. There is a problem that the massage effect of the street cannot be obtained.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an ultrasonic cosmetic device capable of obtaining a suitable massage effect.

[0007]

According to an aspect of the present invention, there is provided an ultrasonic cosmetic device comprising: a metal part having one surface serving as a skin contact surface; A probe having a piezoelectric element to be performed, an oscillation drive circuit for supplying high-frequency power for ultrasonically vibrating the piezoelectric element to the piezoelectric element, a detection circuit for detecting output fluctuation of the piezoelectric element, A control circuit for controlling the output of the oscillation drive circuit so that the output to the piezoelectric element becomes constant according to the detection result.

According to a second aspect of the present invention, there is provided an ultrasonic cosmetic device comprising: a probe having a metal part having one surface serving as a skin contact surface and a piezoelectric element joined to the other surface of the metal part; On the other hand, an oscillation drive circuit that supplies high-frequency power for causing the piezoelectric element to ultrasonically vibrate, a detection circuit that detects output fluctuations of the piezoelectric element, and an output level for the piezoelectric element that is predetermined according to the detection result. And a control circuit for changing the output of the oscillation drive circuit so that the output level becomes the above-mentioned output level.

The invention described in claim 3 is the first or second invention.
In the ultrasonic cosmetic device described above, the detection circuit is provided on an output side of the oscillation drive circuit with respect to the piezoelectric element.

[0010] The invention according to claim 4 is the invention according to claim 1 or 2.
In the ultrasonic cosmetic device described above, the detection circuit is provided on an input side of the oscillation drive circuit.

The invention according to claim 5 is the first or second invention.
In the ultrasonic cosmetic device described above, the control circuit controls power supplied from the oscillation drive circuit to the piezoelectric element.

The invention according to claim 6 is the first or second invention.
In the ultrasonic cosmetic device described above, the control circuit controls an oscillation frequency of the oscillation drive circuit.

The invention according to claim 7 is the first or second invention.
In the ultrasonic cosmetic device described above, the control circuit controls a duty of the oscillation drive circuit.

The invention according to claim 8 is the invention according to claim 5 or 6.
In the ultrasonic cosmetic device described above, the control circuit controls the oscillation drive circuit to start supplying electric power to the piezoelectric element from electric power smaller than a target electric power.

The invention according to claim 9 is the invention according to claim 5 or 6.
In the ultrasonic cosmetic device described above, the control circuit controls the oscillation drive circuit to start supplying power to the piezoelectric element from a power smaller than a target power when a skin contact state with the skin contact surface changes. Is what you do.

[0016]

FIG. 1 is a schematic circuit diagram of an ultrasonic cosmetic device according to a first embodiment of the present invention, FIG. 2 is a sectional view showing a probe and a main body, and FIG. FIG. 4 is an impedance characteristic diagram near the resonance frequency, and FIG. 4 is a control explanatory diagram of the control circuit shown in FIG. 1. The first embodiment will be described below with reference to these diagrams.

As shown in FIG. 2, the present ultrasonic cosmetic device has a metal part 10 having one surface (the upper surface in the figure) serving as a skin contact surface and another surface (FIG. 2) which is an element bonding surface of the metal part 10. In addition to the probe 1 having the piezoelectric element 11 adhered to the lower surface of the probe 1, the main body 2 is connected to the piezoelectric element 11 of the probe 1 via the connection line CW.

As shown in FIG. 1, the circuit configuration of the main body 2 includes an oscillation drive circuit 12 for supplying high frequency power to the piezoelectric element 11 for causing the piezoelectric element 11 to vibrate ultrasonically.
And a detection circuit 13 for detecting output fluctuation of the piezoelectric element 11
And a control circuit 14 for controlling the output of the oscillation drive circuit 12 so that the output to the piezoelectric element 11 is constant according to the detection result.

The above circuit configuration will be described in more detail.
The oscillation drive circuit 12 includes an oscillator 121 that generates an ultrasonic frequency signal, and a drive circuit 122 that amplifies the signal generated by the oscillator 121 and supplies the signal to the piezoelectric element 11 as a drive signal (high-frequency power) S12. It is configured.

The detection circuit 13 detects high-frequency power supplied to the piezoelectric element 11 and outputs a voltage having a level corresponding to the detected power level to the control circuit 14 as a detection signal S13. That is, the voltage level of the detection signal S13 increases as the power supplied to the piezoelectric element 11 increases, and the voltage level of the detection signal S13 decreases as the power supplied decreases. Further, the voltage level of the detection signal S13 in the normal contact state determined at the design stage is set as the target voltage level.

Here, the impedance characteristics of the piezoelectric element 11 will be described. As shown in FIG. 3, the impedance characteristics of the piezoelectric element 11 depend on the characteristic A when the skin is in contact with the skin contact surface and when the skin is not. And characteristic B. In the example of FIG. 3, when the circuit is oscillated at a frequency of 1000 KHz, the impedance of the characteristic A is 15Ω, whereas the impedance of the characteristic B is as small as 2Ω. Therefore, when oscillated at a voltage of 20 V, 27 W
(= 20 ² V ÷ 15Ω) output is 200W (= 20 ² V)
(÷ 2Ω), the power consumption (= acoustic output) increases when the impedance characteristic of the piezoelectric element 11 changes from the characteristic A to the characteristic B. That is, the change of the skin contact state with the skin contact surface of the metal part 10
1 changes in impedance, changes in power of the piezoelectric element 11, and changes in sound output. Such a change in sound output may not only result in a less favorable massage effect, but may also cause other undesirable problems.

Therefore, in the first embodiment, in addition to the detection circuit 13, the detection signal S13 from the detection circuit 13
Control circuit 1 that adjusts the level of drive signal S12 according to
4 is provided. That is, if the voltage level of the detection signal S13 is lower than the target voltage level, the detection circuit 1
The piezoelectric element 1 is supplied to the oscillation drive circuit 12 so that the voltage level of the detection signal S13 from
Control for increasing the amount of power supply to the power supply 1 is performed. On the other hand, if the voltage level of the detection signal S13 is higher than the target voltage level, the power supply to the piezoelectric element 11 is performed on the oscillation drive circuit 12 so that the voltage level of the detection signal S13 from the detection circuit 13 becomes the target voltage level. Control for reducing the supply amount is performed.

As shown in the operation example of FIG. 4, in the normal contact state, the power supplied to the piezoelectric element 11 becomes the target power, and the voltage level of the detection signal S13 becomes the target voltage level. The state of power supply to the piezoelectric element 11 is maintained as it is.

Thereafter, when the skin contact surface comes into an excessive pressing state in which the skin contact surface is pressed against the skin more strongly than the normal contact state (time t1).
1) Since the impedance value of the piezoelectric element 11 increases and the power supplied to the piezoelectric element 11 decreases, the detection signal S13 having a voltage level lowered according to the decrease in the supplied power is detected by the detection circuit 13. Output from When the detection signal S13 is taken into the control circuit 14, the power supply amount to the piezoelectric element 11 is supplied to the oscillation drive circuit 12 so that the voltage level of the detection signal S13 from the detection circuit 13 becomes the target voltage level. Increase control is performed. By repeating this control, the detection signal S13
Becomes the target voltage level, and the power supplied to the piezoelectric element 11 becomes the target power supply (time t1).
2).

Thereafter, when the skin contact surface is brought into a non-contact state separated from the skin (time t13), the impedance value of the piezoelectric element 11 decreases, and the power supplied to the piezoelectric element 11 increases. The detection signal S13 of the voltage level boosted in accordance with the increase of
Output from When the detection signal S13 is taken into the control circuit 14, the power supply amount to the piezoelectric element 11 is supplied to the oscillation drive circuit 12 so that the voltage level of the detection signal S13 from the detection circuit 13 becomes the target voltage level. Control to reduce is performed. By repeating this control, the voltage level of the detection signal S13 becomes the target voltage level, and the power supplied to the piezoelectric element 11 becomes the target power supply (time t14).

As described above, according to the first embodiment, the metal part 10
Piezoelectric element 1 according to the state of skin contact with the skin contact surface of
Even if the impedance of 1 fluctuates and the power supplied to the piezoelectric element 11 fluctuates, the fluctuation in the supplied power is corrected to the target supplied power, so that the acoustic output from the metal unit 10 can be made substantially constant. . Thereby, a suitable massage effect, that is, a stable massage effect by a constant sound output can be obtained, and various problems due to an undesirable change in the sound output can be prevented.

In the first embodiment, the power supply to the piezoelectric element 11 is detected by the detection circuit 13, and as a result of the detection, a detection signal corresponding to the fluctuation of the power supply is output. However, the configuration is not limited to this, and a configuration may be adopted in which a voltage or a current is detected for the piezoelectric element 11 and a detection signal corresponding to the fluctuation is output as a result of the detection.

FIG. 5 is a schematic circuit configuration diagram of an ultrasonic cosmetic device according to a second embodiment of the present invention, and FIG. 6 is a control explanatory diagram of the control circuit shown in FIG. An embodiment will be described.

As shown in FIG. 5, the present ultrasonic cosmetic device includes a piezoelectric element 11, an oscillation drive circuit 12, and a detection circuit 13 in the same manner as in the first embodiment, and differs from the first embodiment. The control circuit 24 is provided.

The control circuit 24 changes the output of the oscillation drive circuit 12 according to the detection signal S13 from the detection circuit 13 so that the output level to the piezoelectric element 11 becomes a predetermined output level. That is, the control circuit 24
Has two reference values Ref1 and Ref2 (Ref1 <Ref2) as shown in the example of FIG. 6 in the second embodiment, and the detection signal S
13, the voltage level from the detection signal S13 is higher than the reference value Ref1 and lower than the reference value Ref2.
While the amount of power supply to the piezoelectric element 11 is reduced so as to become r1, if the voltage level of the detection signal S13 is higher than the reference value Ref2, the voltage level from the detection signal S13 becomes the control value Tar2.
Control to reduce the amount of power supplied to the piezoelectric element 11 is performed on the oscillation drive circuit 12 so that (<Tar1). However, the reference value Ref1 is the detection signal S1 in the normal contact state.
A voltage level higher than 3 is set.

Next, the circuit operation of the second embodiment will be described. In the normal contact state, as shown in the example of FIG. 6, the voltage level of the detection signal S13 obtained from the power supplied to the piezoelectric element 11 is changed. Since it is lower than the two reference values Ref1 and Ref2, the state of power supply from the oscillation drive circuit 12 to the piezoelectric element 11 is maintained as it is.

Thereafter, the contact state of the skin contact surface of the metal part 10 with the skin is slightly weakened, the impedance value of the piezoelectric element 11 is slightly reduced, and the power supplied to the piezoelectric element 11 is changed to the non-contact state. Then, the amount of power supplied to the piezoelectric element 11 is reduced so that the voltage level of the detection signal S13 becomes higher than the reference value Ref1 and lower than the reference value Ref2 (time point t21), and the voltage level from the detection signal S13 becomes the control value Tar1. Control to reduce is performed. By repeatedly performing this control, the voltage level of the detection signal S13 becomes the control value Tar1 (time t22), and the power supplied to the piezoelectric element 11 is adjusted within the range of the power supplied in the normal contact state. Become.

Thereafter, when the piezoelectric element 1 is brought into a non-contact state,
The impedance value of the piezoelectric element 1 is further reduced.
1 is further increased, the detection signal S1
3 becomes higher than the reference value Ref2 (time t2
3) Control is performed to reduce the amount of power supplied to the piezoelectric element 11 so that the voltage level from the detection signal S13 becomes the control value Tar2. By repeating this control,
The voltage level of the detection signal S13 becomes the control value Tar2 (time t24), and the power supplied to the piezoelectric element 11 is adjusted within the range of the power supplied in the normal contact state.

As described above, according to the second embodiment, when the semi-contact state is reached, the power supplied to the piezoelectric element 11 can be adjusted within the range of the power supplied in the normal contact state. Since the power supplied to the piezoelectric element 11 can be adjusted to be smaller than that in the semi-contact state within the range of the power supply in the normal contact state, for example, the normal state set similarly to the related art, the second embodiment The sound output suitably changes in accordance with the skin contact state in the semi-contact state and the non-contact state, which is characterized by the above. Thereby, it is possible to obtain a suitable massage effect, that is, a massage effect that is suitably (desirably) changed according to the skin contact state, and to prevent various problems caused by an undesirable change in sound output.

FIG. 7 is a schematic circuit diagram of an ultrasonic cosmetic device according to a third embodiment of the present invention, and FIG. 8 is an operation waveform diagram of each circuit shown in FIG. An embodiment will be described.

As shown in FIG. 7, the present ultrasonic cosmetic device includes a piezoelectric element 11 in the same manner as in the first embodiment, and differs from the first embodiment in that an oscillation drive circuit 32, a detection circuit 33 and a control circuit 34.

The oscillation drive circuit 32 supplies high frequency power for causing the piezoelectric element 11 to vibrate ultrasonically to the piezoelectric element 11, and includes an oscillator 121 as in the first embodiment. As a specific circuit example, resistors R321, R322 and F
A drive circuit 322 comprising ETQs 321 and Q322 is provided. The drive circuit 322 amplifies the power of the signal generated by the oscillator 121 and supplies the signal to the piezoelectric element 11 as a drive signal S32.

The detection circuit 33 includes a current transformer T33
1 and a resistor R331, a current detection circuit 331 for detecting a current flowing through the piezoelectric element 11 correlated with the drive signal S32 as a voltage, and a diode D331, a capacitor C331 and a resistor R332, which are detected by the current detection circuit 331. An envelope detection circuit 332 that removes high frequency components from the voltage and outputs a voltage of a level corresponding to the current level to the piezoelectric element 11 to the control circuit 34 as a detection signal S33. Note that the current detection circuit 3
Instead of 31, a configuration employing a low resistance (for example, 0.1Ω) may be used.

The control circuit 34 includes a NOT circuit 341, a resistor R341, a transistor Q341, and an inductor L34.
1, capacitor C341 and electrolytic capacitor C342
In order to adjust the level of the drive signal S32 according to the detection signal S33 from the detection circuit 33,
33, a voltage whose level changes in accordance with the voltage of the control signal S
The signal 34 is output to the drive circuit 322. Thereby, as the voltage level of the detection signal S33 increases,
The voltage level of the control signal S34 is further reduced, and the power supplied to the piezoelectric element 11 by the drive signal S32 is further reduced. On the other hand, as the voltage level of the detection signal S33 decreases, the voltage level of the control signal S34 further increases, and the power supplied to the piezoelectric element 11 by the drive signal S32 further increases. However, the control circuit 34 is configured such that when the power supplied to the piezoelectric element 11 reaches the target supply power, the voltage level of the control signal S34 as an output is balanced.

Next, the circuit operation of the third embodiment will be described. In the non-contact state, the power supplied to the piezoelectric element 11 is larger than the target power, as shown in the example of FIG. (A detection current of the current detection circuit) is detected as a voltage (an output voltage of the current detection circuit), and the detected voltage is a detection signal S33 (an output of the envelope detection circuit) after removing the high-frequency component. (Voltage) is output from the detection circuit 33 to the control circuit 34. Thereafter, the control signal S whose voltage level has decreased according to the detection signal S33.
34 is output from the control circuit 34 to the drive circuit 322 as the power supply voltage of the drive circuit 322. As a result, the voltage level of the drive signal S32 decreases, and the power supplied to the piezoelectric element 11 decreases. By repeatedly performing such a circuit operation, the power supplied to the piezoelectric element 11 is adjusted to the target supply power (time t3).
1).

Thereafter, when the skin contact surface of the metal part 10 comes into contact with the skin, the impedance value of the piezoelectric element 11 increases and the power supplied to the piezoelectric element 11 decreases (time t32). A current having a level corresponding to the supplied power is detected as a voltage, and the detected voltage is used as a detection signal S33 after removal of the high-frequency component as a detection signal S33.
Is output to the control circuit 34. Thereafter, the detection signal S3
3, the control signal S34 having a higher voltage level is output from the control circuit 34 to the drive circuit 322. As a result,
The voltage level of the drive signal S32 increases, and the piezoelectric element 11
The power supplied to is increased. By repeatedly performing such a circuit operation, the power supplied to the piezoelectric element 11 is adjusted to the target supply power (time t).
33).

As described above, according to the third embodiment, the same effect as that of the first embodiment can be obtained, and the change (voltage, current, and power) caused by the impedance change of the piezoelectric element 11 can be accurately determined. Can be detected. For example, as an oscillation circuit configuration, there are a power supply, a drive circuit, and a piezoelectric element, and the power supply is 7 W, the drive circuit is 5 W, and the piezoelectric element is 4 W
When the output can be output, the loss from the power supply to the driving circuit is 2 W, and the efficiency is 71%. Further, the loss from the drive circuit to the piezoelectric element is 1 W, and the efficiency is 80%. When the error of each efficiency is ± 5%, if the detection is performed on the piezoelectric element side of the drive circuit, it can be detected with a measurement error of 5%. ,
The loss of the driving circuit overlaps, and the detection accuracy is reduced. That is,
The detection on the piezoelectric element side of the drive circuit enables highly accurate detection.

FIG. 9 is a schematic circuit diagram of an ultrasonic cosmetic device according to a fourth embodiment of the present invention, and FIG. 10 is an operation waveform diagram of each circuit shown in FIG. An embodiment will be described.

As shown in FIG. 9, the present ultrasonic cosmetic device includes a piezoelectric element 11 in the same manner as in the first embodiment, and differs from the first embodiment in that an oscillation drive circuit 42, a detection circuit 43 and a control circuit 44. However, the oscillation drive circuit 42, the detection circuit 43, and the control circuit 4
4 is configured as follows so as to operate within a range from the resonance frequency to the anti-resonance frequency (a range where the impedance characteristic is linear) (see FIG. 3).

The oscillation drive circuit 42 supplies high frequency power to the piezoelectric element 11 for causing the piezoelectric element 11 to vibrate ultrasonically, and supplies a drive signal S32 as the high frequency power to the piezoelectric element 11. Drive circuit 322
Is provided in the same manner as the third embodiment, and as a specific circuit example, a resistor R421 and a capacitor C4 constituting a VCO are provided.
21, variable capacitance diode D421, capacitor C42
2, an oscillator 421 configured by a resistor R422 and a two-input NAND 422, which generates an ultrasonic frequency signal and outputs the signal to the input of the drive circuit 322.

The detection circuit 43 comprises a resistor R431 provided on the input side of the drive circuit 322, more specifically, on a power supply path to the drive circuit 322, and detects the power supplied to the drive circuit 322 which is correlated with the drive signal S32. This is detected as a signal S43 (voltage drop of the resistor R431).

The control circuit 44 connects the inductor L341, the capacitor C341, and the electrolytic capacitor C342 to a third
The detection circuit 4 includes a differential amplifier 441 and resistors R441 to R444, in addition to the same components as those of the embodiment.
3 outputs a voltage whose level changes in response to the detection signal S43 from the oscillator 421 to the input of the oscillator 421 as a control signal S44.

Next, the circuit operation of the fourth embodiment will be described. In the non-contact state, as shown in the example of FIG. 10, the supply power to the piezoelectric element 11 becomes larger than the target supply power.
A large voltage drop corresponding to the supplied power is generated in the resistor R431, and the voltage drop is detected as a detection signal S43 by the detection circuit 4.
3 to the control circuit 44. Then, the voltage level of control signal S44 from control circuit 44 to oscillator 421 increases, and the output frequency of oscillator 421 increases. As a result, the impedance of the piezoelectric element 11 increases (see the linear range in FIG. 3), and the power supplied to the piezoelectric element 11 decreases. By repeatedly performing such a circuit operation, the power supplied to the piezoelectric element 11 is adjusted to the target supply power (time t41).

Thereafter, when the skin contact surface of the metal part 10 comes into contact with the skin, the impedance value of the piezoelectric element 11 increases, the power supplied to the piezoelectric element 11 decreases (time t42), and the resistance increases. The voltage drop at R431 becomes small and is taken from the detection circuit 43 to the control circuit 44 as the detection signal S43. Then, the voltage level of control signal S44 from control circuit 44 to oscillator 421 decreases, and the output frequency of oscillator 421 decreases. As a result,
The impedance of the piezoelectric element 11 decreases, and the piezoelectric element 1
1 increases the supply power. By repeatedly performing such a circuit operation, the power supplied to the piezoelectric element 11 is adjusted to the target supply power (time t4).
3).

Next, a more specific description will be given with reference to FIG. 3. For example, when a voltage of 20 V is applied to the piezoelectric element 11 at an oscillation frequency of 1000 KHz in the contact state, when the piezoelectric element 11 becomes non-contact, The impedance of element 11 is 2
And the supply power to the piezoelectric element 11 becomes 200 W, which is larger than the target supply power. In this case, if the oscillation frequency is changed to 1008 KHz, the impedance of the piezoelectric element 11 becomes 15Ω, and the power supplied to the piezoelectric element 11 can be reduced to 27 W. Thereafter, the contact state is established, the impedance of the piezoelectric element 11 becomes 22Ω, and the power supplied to the piezoelectric element 11 is lower than the target supply power.
In the case of W, if the oscillation frequency is changed to 1000 KHz, the impedance of the piezoelectric element 11 becomes 15Ω, and the power supplied to the piezoelectric element 11 becomes 2 which is the target power supply.
7W can be increased.

As described above, according to the fourth embodiment, the same effects as those of the first embodiment can be obtained, and the change (voltage, current, and power) caused by the impedance change of the piezoelectric element 11 can be accurately controlled. Can be detected. Third
Compared with the embodiment, although an oscillation circuit efficiency factor is added, more stable detection can be performed because the frequency is lower than the high frequency voltage on the piezoelectric element side as in the third embodiment.

It is needless to say that the detection circuit 43 may be an A / D converter and the oscillator 421 may be a PLL, or may be configured to be controlled by a one-chip microcomputer.

FIG. 11 is a schematic circuit configuration diagram of an ultrasonic cosmetic device according to a fifth embodiment of the present invention, and FIG. 12 is an operation waveform diagram of each circuit shown in FIG. An embodiment will be described.

As shown in FIG. 11, the present ultrasonic beauty device
The piezoelectric element 11, the detection circuit 33 and the control circuit
In addition to being provided in the same manner as in the embodiment, an oscillation drive circuit 52 is provided as a difference from the third embodiment.

The oscillation drive circuit 52 includes a drive circuit 322
Is provided in the same manner as in the third embodiment.
A transmitter 521 having the same configuration as the transmitter 421 of the fourth embodiment except that the detection signal S33 from is input.

Next, the circuit operation of the fifth embodiment will be described. In the non-contact state, as shown in the example of FIG. 12, the supply power to the piezoelectric element 11 is larger than the target supply power. The current of the level according to is detected as a voltage,
The detected voltage is output from the detection circuit 33 to both the control circuit 34 and the transmitter 521 as a detection signal S33 after removing the high-frequency component. As a result, the piezoelectric element 1
1 becomes smaller. By repeatedly performing such a circuit operation, the power supplied to the piezoelectric element 11 is adjusted to the target supply power (time t51).

Thereafter, when the contact state is reached, the piezoelectric element 11
Supplied to the power supply (time t52), a current having a level corresponding to the supplied power is detected as a voltage, and the detected voltage is used as a detection signal S33 after removing high-frequency components.
From the detection circuit 33 to the control circuit 34 and the transmitter 5
21. As a result, the power supplied to the piezoelectric element 11 increases. By repeating such a circuit operation, the power supplied to the piezoelectric element 11 is adjusted to the target supply power (time t5).
3).

Next, a more specific description will be given with reference to FIG. 3. For example, in a contact state, when a voltage of 20 V is applied to the piezoelectric element 11 at an oscillation frequency of 1000 KHz, when the piezoelectric element 11 becomes non-contact, The impedance of element 11 is 2
And the supply power to the piezoelectric element 11 becomes 200 W, which is larger than the target supply power. In this case, if the oscillation frequency is changed to 1005 KHz, the impedance of the piezoelectric element 11 becomes 6Ω, and if the voltage of the control signal S34 is further reduced to about 13 V, the power supplied to the piezoelectric element 11 becomes 28Ω.
W. Thereafter, when the contact state is established, the impedance of the piezoelectric element 11 becomes 20Ω, and the power supplied to the piezoelectric element 11 becomes 8 W, which is lower than the target supply power, the oscillation frequency is changed to 1000 KHz. When the impedance of 11 becomes 15Ω and the voltage of the control signal S34 is further increased to about 20 V, the power supplied to the piezoelectric element 11 can be increased to 28 W which is the target supplied power.

As described above, according to the fifth embodiment, the same effects as those of the third embodiment can be obtained. Further, for example, by controlling the drive circuit 322 by a control method such as a voltage-fixed current variation method or a current-fixed voltage variation method, power supply according to impedance change when the oscillation frequency is fixed can be performed with a simple circuit configuration. Can be.

FIG. 13 is a schematic circuit diagram of an ultrasonic cosmetic device according to a sixth embodiment of the present invention, and FIG. 14 is an operation waveform diagram of each circuit shown in FIG. An embodiment will be described.

As shown in FIG. 13, the present ultrasonic beauty device
The piezoelectric element 11, the detection circuit 43, and the control circuit 44
In addition to being provided in the same manner as in the embodiment, an oscillation drive circuit 62 is provided as a difference from the fourth embodiment. However, in the control circuit 44, a DC power supply DC1 is connected between the resistor R442 and the ground.

The oscillation drive circuit 62 includes an oscillator 121 and a drive circuit 322 as in the third embodiment, and also includes an oscillator 623 and an AND circuit 624. The oscillator 623 has a VCD circuit configuration including a resistor R621, a capacitor C621, and a monostable multivibrator 625 provided on the output side of the VCO in addition to the VCO circuit configuration similar to the oscillator 421 of the fourth embodiment. The duty is controlled by a control signal S44 from the control circuit 44, and a rectangular wave having the duty ratio (the desired frequency is about 50 Hz) is output. Further, both output signals of the oscillators 121 and 623 are two-input A
The driving circuit 322 is input to the driving circuit 322 via the ND circuit 624. However, the oscillator 121 has a frequency of about 1 MHz.
Is configured to continuously oscillate the ultrasonic oscillation frequency.

Here, the schematic operation of the oscillation driving circuit 62 will be described.
The signal of the ultrasonic oscillation frequency is output. On the other hand, the oscillator 6
In 23, the VCO outputs a rectangular wave having a duty ratio according to the control signal S44 (VCO output waveform of the oscillator 623 in FIG. 14), and the monostable multivibrator 625 outputs a pulse having a set time length at the rising timing of the rectangular wave. (The output waveform of the oscillator 623 in FIG. 14). The output signals of these oscillators 121 and 623 are
24 and are input to the drive circuit 322 (FIG. 14).
Drive circuit input).

In such an operation, when the power supplied to the piezoelectric element 11 increases, the voltage drop at the resistor R431 increases, the voltage of the control signal S44 increases, and the oscillation frequency of the oscillator 623 decreases. Since the monostable multivibrator 625 emits a pulse for a certain time, the duty is reduced. As a result, the output time of the oscillation drive circuit 62 to the piezoelectric element 11 is shortened, and the average power supply is reduced. By performing the duty control in this manner, the average power supplied to the piezoelectric element 11 can be made constant.

Next, the circuit operation of the sixth embodiment will be described. In the non-contact state, the power supplied to the piezoelectric element 11 becomes larger than the target power, so that the voltage of the control signal S44 rises and the oscillator The oscillation frequency of 623 becomes lower. As a result, the output time of the oscillation drive circuit 62 to the piezoelectric element 11 is shortened, and the average power supply is reduced. By repeatedly performing such a circuit operation, the power supplied to the piezoelectric element 11 is adjusted to the target supply power (time t61).

Thereafter, when the contact state is reached, the piezoelectric element 11
Since the power supplied to the oscillator 623 decreases (time t62), the voltage of the control signal S44 drops, and the oscillation frequency of the oscillator 623 increases. As a result, the oscillation drive circuit 6 to the piezoelectric element 11
2, the output time becomes longer, and the average supply power increases. By repeatedly performing such a circuit operation, the power supplied to the piezoelectric element 11 is adjusted to the target supply power (time t63).

As described above, according to the sixth embodiment, the same effects as those of the fourth embodiment can be obtained. In addition, for example, the power supply according to the change in the impedance of the piezoelectric element due to the change in the contact state of the skin is substantially reduced. By using a constant voltage and current, circuit design is facilitated, and circuit stability in use is improved. In addition, by controlling the intermittent oscillation frequency, the power supplied to the piezoelectric element can be varied, and by controlling the power to the target power, a suitable power supply that does not always exceed the target power can be performed.

FIG. 15 is a schematic circuit diagram of an ultrasonic cosmetic device according to a seventh embodiment of the present invention, and FIG. 16 is an operation waveform diagram of each circuit shown in FIG. An embodiment will be described. However, FIG. 16A is an operation waveform diagram in the case of the third embodiment, and FIG. 16B is an operation waveform diagram in the case of the seventh embodiment. Also, the SW shown in FIG.
Denotes an ultrasonic oscillation start switch (not shown).

As shown in FIG. 15, the present ultrasonic beauty device
A piezoelectric element 11, an oscillation drive circuit 32, and a detection circuit 33 are provided in the same manner as in the third embodiment, and a difference from the third embodiment is a control circuit 74.

The control circuit 74 includes, in addition to the circuit configuration of the control circuit 34 of the third embodiment, a transistor Q741, resistors R741, R742 and a switch S interlocked with an ultrasonic oscillation start switch, which constitute a high voltage superposition circuit.
In addition to performing the same operation as the control circuit 34, when the ultrasonic oscillation start switch is turned on, the switch S741 is turned on for a predetermined time (for a moment) at the same time as the ultrasonic oscillation start switch is turned on. (For example, 15V)
Is performed.

Here, the reason for providing the high voltage superimposing circuit will be described. When the ultrasonic oscillation start switch is turned on in the non-contact state, the detection signal S33 at the output of the detection circuit 33 immediately after being turned on has the minimum power supply to the piezoelectric element 11, so Has become. Therefore, in this state, the control for increasing the power supplied to the piezoelectric element 11 is performed in accordance with the detection signal S33 having the minimum value, and the supplied power is controlled as shown in FIG.
As shown in the waveform immediately after SW ON shown in FIG. As described above, it is not preferable to exceed the target power as described above.

Therefore, in the seventh embodiment, a high voltage is superimposed on the detection signal S33 from the detection circuit 33 by the high voltage superimposition circuit at the same time when the ultrasonic oscillation start switch is turned on. Thereby, the NO of the control circuit 74
Since the voltage of the detection signal S33 taken into the T circuit 341 momentarily becomes approximately 15 V (the maximum value of the setting range), FIG.
As shown in the waveform immediately after SW ON shown in FIG.
The control for reducing the power supplied to the power supply 1 is performed. As a result, it is possible to prevent an undesired state in which the target power is exceeded as shown in FIG.
In the subsequent operation, the output voltage of the high-voltage superimposing circuit superimposed on the detection signal S33 of the detection circuit 33 becomes zero, and thereafter, the circuit operation is the same as that of the third embodiment.

As described above, according to the seventh embodiment, the same effects as those of the third embodiment can be obtained, and an undesired state in which the target power that can be generated immediately after the ultrasonic oscillation start switch is turned on is exceeded. Can be prevented.

The same effect as described above can be obtained even if the oscillator 623 starts oscillating near the anti-resonance frequency when the ultrasonic oscillation start switch is turned on. Further, even if the oscillation drive circuit 62 is configured to reduce the duty, the same effect as described above can be obtained.

FIG. 17 is a schematic circuit diagram of an ultrasonic cosmetic device according to an eighth embodiment of the present invention, and FIG. 18 is an operation waveform diagram of each circuit shown in FIG. An embodiment will be described.

As shown in FIG. 17, the present ultrasonic beauty device
A piezoelectric element 11, an oscillation drive circuit 42, and a detection circuit 43 are provided in the same manner as in the fourth embodiment, and a control circuit 84 is provided as a difference from the fourth embodiment.

The control circuit 84 includes, in addition to the circuit configuration of the control circuit 44 of the fourth embodiment, capacitors C841 and C842 and resistors R841 to R84 forming a detection superposition circuit.
8, comparators 841 and 842 and transistor Q
841, performs the same operation as the control circuit 44, and detects both positive and negative changes of the control signal S 44. When the change of the control signal S 44 is larger than the reference levels of the comparators 841 and 842, the transistor Q841 is turned on. Is turned on, a high voltage is superimposed on the control signal S44, and the control signal S
When the change of 44 is smaller than the reference level of the comparators 841 and 842, the transistor Q841 is turned off, and the operation of stopping the voltage superimposition on the control signal S44 is performed.

Here, the reason for providing the detection superimposing circuit will be described. As described above, when the metal part 10 is brought into close contact with or separated from the skin during use, the impedance of the piezoelectric element 11 changes rapidly as described above.
When the probe 1 is moved while keeping the
1 may change abruptly. It is not desirable to exceed the allowable power (= target supply power ten α) many times due to such a sudden change in impedance.

Therefore, in the eighth embodiment, the detection superimposing circuit is provided, and when the supply power to the piezoelectric element 11 exceeds the target supply power, the supply power to the piezoelectric element 11 immediately falls within the range of the target supply power. (See the waveforms of the power supplied to the piezoelectric elements in FIGS. 10 and 18).

Next, the operation of the eighth embodiment will be outlined.
At the same time as the start of the ultrasonic output, power is supplied to the piezoelectric element 11 according to the impedance value. When a rapid change in the power is detected by the resistor R431, the control signal S44
Is a signal indicating a rapid voltage change according to the detection signal S43. At this time, the capacitor C841 and the resistor R84
2 (differentiating circuit), a change amount is extracted from the control signal S44, and the change amount is compared with comparators 841 and 842.
Is compared with the reference level. In this case, when the amount of change exceeds the reference level (in other words, the reference level is set to be lower than the amount of change in such a case), the transistor Q841 is turned on. As a result, the control signal S44 is superimposed with the high voltage to have a substantially maximum value, and the oscillation frequency of the oscillator 421 becomes close to the anti-resonance frequency. Further, even if the control signal S44 becomes a signal indicating a sudden decrease, the oscillation frequency is controlled in the same manner as described above,
The signal voltage control for the oscillator 421 is terminated by discharging the capacitor C842.

As described above, according to the eighth embodiment, the same effects as those of the fourth embodiment can be obtained, and an undesired state that exceeds a target power that can occur during use can be quickly eliminated. Will be possible.

The detection superimposing circuit can be applied to the control circuit 34, and the same effect can be obtained by controlling the duty ratio.

[0083]

As is apparent from the above description, according to the first aspect of the present invention, a metal part having one surface serving as a skin contact surface and a piezoelectric element bonded to the other surface of the metal part are provided. A probe having, an oscillation drive circuit for supplying high-frequency power for ultrasonically vibrating the piezoelectric element to the piezoelectric element, a detection circuit for detecting an output fluctuation of the piezoelectric element, and Since a control circuit is provided for controlling the output of the oscillation drive circuit so that the output to the piezoelectric element is constant, the sound output from the metal part can be constant. As a result, a suitable massage effect can be obtained.

According to the second aspect of the present invention, a probe having a metal part whose one surface is a skin contact surface and a piezoelectric element joined to the other surface of the metal part, An oscillation drive circuit for supplying high-frequency power for ultrasonically oscillating the piezoelectric element, a detection circuit for detecting an output fluctuation of the piezoelectric element, and an output level for the piezoelectric element according to the detection result, wherein a predetermined output level is provided. And a control circuit that changes the output of the oscillation drive circuit so that, for example, if a plurality of predetermined output levels are provided, a suitable massage effect, that is, a massage effect that changes suitably according to the skin contact state. Obtainable.

According to the third aspect of the present invention, in the ultrasonic cosmetic device according to the first or second aspect, the detection circuit is provided on the output side of the oscillation drive circuit with respect to the piezoelectric element. , It is possible to detect a change (voltage, current, power) caused by a change in impedance with high accuracy.

According to the fourth aspect of the present invention, in the ultrasonic cosmetic device according to the first or second aspect, since the detection circuit is provided on the input side of the oscillation drive circuit, for example, an output to a piezoelectric element is provided. The frequency of the detection signal can be lower than that of the side detection. As a result, more stable detection can be performed.

According to the fifth aspect of the present invention, in the ultrasonic cosmetic device according to the first or second aspect, the control circuit controls the power supplied from the oscillation drive circuit to the piezoelectric element. It can be made simple.

According to the sixth aspect of the present invention, in the ultrasonic cosmetic device according to the first or second aspect, since the control circuit controls the oscillation frequency of the oscillation drive circuit, the circuit design is facilitated and the use is simplified. The circuit stability in the state is improved.

According to the seventh aspect of the present invention, in the ultrasonic cosmetic device according to the first or second aspect, the control circuit controls the duty of the oscillation drive circuit, so that a suitable power supply is possible.

According to the eighth aspect of the present invention, in the ultrasonic cosmetic device according to the fifth or sixth aspect, the control circuit comprises:
For the oscillation drive circuit, at the time of starting the power supply to the piezoelectric element, control is performed to start the supply from power smaller than the target power. Can be prevented.

According to the ninth aspect of the present invention, in the ultrasonic cosmetic device according to the fifth or sixth aspect, the control circuit comprises:
When the skin drive state changes with respect to the skin contact surface, the oscillation drive circuit performs control to start the power supply to the piezoelectric element from a power smaller than the target power. An undesirable state due to excessive power supply can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic circuit configuration diagram of an ultrasonic cosmetic device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a probe and a main body.

FIG. 3 is an impedance characteristic diagram near the resonance frequency of the piezoelectric element shown in FIG.

FIG. 4 is a control explanatory diagram of the control circuit shown in FIG. 1;

FIG. 5 is a schematic circuit configuration diagram of an ultrasonic cosmetic device according to a second embodiment of the present invention.

FIG. 6 is a control explanatory diagram of the control circuit shown in FIG. 5;

FIG. 7 is a schematic circuit configuration diagram of an ultrasonic cosmetic device according to a third embodiment of the present invention.

FIG. 8 is an operation waveform diagram of each circuit shown in FIG. 7;

FIG. 9 is a schematic circuit configuration diagram of an ultrasonic cosmetic device according to a fourth embodiment of the present invention.

10 is an operation waveform diagram of each circuit shown in FIG.

FIG. 11 is a schematic circuit configuration diagram of an ultrasonic cosmetic device according to a fifth embodiment of the present invention.

FIG. 12 is an operation waveform diagram of each circuit shown in FIG. 11;

FIG. 13 is a schematic circuit configuration diagram of an ultrasonic cosmetic device according to a sixth embodiment of the present invention.

FIG. 14 is an operation waveform diagram of each circuit shown in FIG. 13;

FIG. 15 is a schematic circuit configuration diagram of an ultrasonic cosmetic device according to a seventh embodiment of the present invention.

16 is an operation waveform diagram of each circuit shown in FIG.

FIG. 17 is a schematic circuit configuration diagram of an ultrasonic cosmetic device according to an eighth embodiment of the present invention.

18 is an operation waveform diagram of each circuit shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Probe 2 Main body 10 Metal part 11 Piezoelectric element 12, 32, 42, 52, 62 Oscillation drive circuit 13, 33, 43 Detection circuit 14, 24, 34, 44, 74, 84 Control circuit

Claims (9)

[Claims] 1. A probe having a metal part having one surface serving as a skin contact surface and a piezoelectric element bonded to another surface of the metal part, and an ultrasonic vibration of the piezoelectric element with respect to the piezoelectric element. An oscillation drive circuit that supplies high-frequency power, a detection circuit that detects output fluctuations of the piezoelectric element, and an output control of the oscillation drive circuit such that an output to the piezoelectric element is constant according to the detection result. Ultrasonic cosmetic device comprising a control circuit for performing the operation. 2. A probe having a metal part having one surface serving as a skin contact surface and a piezoelectric element joined to the other part of the metal part, and an ultrasonic vibration of the piezoelectric element with respect to the piezoelectric element. An oscillation drive circuit that supplies high-frequency power of, a detection circuit that detects output fluctuations of the piezoelectric element, and the oscillation drive circuit such that an output level to the piezoelectric element becomes a predetermined output level according to the detection result. And a control circuit for changing the output of the ultrasonic beauty device. 3. The ultrasonic cosmetic device according to claim 1, wherein the detection circuit is provided on an output side of the oscillation drive circuit with respect to the piezoelectric element. 4. The ultrasonic cosmetic device according to claim 1, wherein the detection circuit is provided on an input side of the oscillation drive circuit. 5. The control circuit according to claim 1, wherein the control circuit controls power supplied from the oscillation drive circuit to the piezoelectric element.
The described ultrasonic beauty device. 6. The ultrasonic cosmetic device according to claim 1, wherein the control circuit controls an oscillation frequency of the oscillation drive circuit. 7. The ultrasonic cosmetic device according to claim 1, wherein the control circuit controls a duty of the oscillation driving circuit. 8. The control circuit according to claim 5, wherein the control circuit controls the oscillation drive circuit to start supplying power to the piezoelectric element from a power smaller than a target power when starting the power supply to the piezoelectric element. Sonic beauty device. 9. The control circuit according to claim 1, wherein said oscillation drive circuit is configured to:
The ultrasonic cosmetic device according to claim 5, wherein control is performed such that power supply to the piezoelectric element is started from a power smaller than a target power.