Beauty equipment

Abstract

The beauty device (1) comprises: a first electrode (11); a second electrode (12), a third electrode (13) and a fourth electrode (14), which are annular electrodes arranged on concentric circles around the first electrode, the second electrode is arranged outside the first electrode, the third electrode is arranged outside the second electrode, and the fourth electrode is arranged outside the third electrode; and an applying unit (20), which can apply a first frequency current to the skin between the first electrode and the fourth electrode while applying a second frequency current to the skin between the second electrode and the third electrode.

Description

Technical Field

[0001] The present invention relates to a cosmetic device for applying electric current to the skin. Background Art

[0002] Technologies that pass electric current through the skin for the purposes of beauty and weight loss exist. Representative technologies include those that stimulate muscles (so-called EMS (Electric Muscle Stimulation)) and those that primarily provide a sense of warmth (using RF (radio waves) to heat the skin from the inside).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2012-65693 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] Generally, the frequency bands of the current used in EMS (hereinafter referred to as EMS current) and the current used to achieve effects such as warmth sensation (hereinafter referred to as RF current) are different. Therefore, there are appropriate conditions in the case of applying EMS current and in the case of applying RF current. Specifically, in EMS, the larger the range of the stimulation object, the higher the effect, and the range of the stimulation object is determined by the distance between the electrodes in contact with the skin. Therefore, it is basically preferred that the distance between the electrodes is large. In addition, in order to obtain a certain effect, it is necessary to apply it continuously to a certain extent. On the other hand, it is known that in the application of RF current, the smaller the distance between the electrodes, the higher the effect. Here, although it is also considered that even if the distance between the electrodes is far, the reduced effect can be compensated by increasing the application frequency or increasing the application time, high frequency or increased application time may cause discomfort to the user.

[0008] Thus, at least in principle, there is no electrode configuration that is optimal for both EMS and RF applications. To achieve both muscle stimulation and warmth, time-sharing control of the application time or switching the applied current frequency have been considered. However, this can complicate the circuit structure or impose certain restrictions on the frequency or amplitude of the applied current.

[0009] As described above, in existing cosmetic devices, it is difficult to simultaneously achieve the effects brought about by applying EMS current and the effects brought about by applying RF current.

[0010] An object of the present invention is to provide a structure capable of efficiently and simultaneously applying currents of different frequencies.

[0011] Means for solving problems

[0012] The present invention provides a beauty device in one embodiment, which has: a first electrode; a second electrode, a third electrode and a fourth electrode, which are annular electrodes arranged on concentric circles around the first electrode, the second electrode is arranged on the outside of the first electrode, the third electrode is arranged on the outside of the second electrode, and the fourth electrode is arranged on the outside of the third electrode; and an application unit, which can apply a first frequency current to the skin between the first electrode and the fourth electrode while applying a second frequency current to the skin between the second electrode and the third electrode.

[0013] In a preferred embodiment, the first frequency is 1 Hz to 100 kHz, and the second frequency is 200 kHz to 4 MHz.

[0014] In a preferred embodiment, the applying unit has a selection unit that selects an electrode pair to be used when applying the current of the first frequency or an electrode pair to be used when applying the current of the second frequency from the first electrode to the fourth electrode based on at least any one of the values ​​of the first frequency and the values ​​of the second frequency.

[0015] In a preferred embodiment, the applying unit has a selection unit that selects an electrode pair to be used when applying the current of the first frequency or an electrode pair to be used when applying the current of the second frequency from the first electrode to the fourth electrode based on at least any one of the amplitude of the current of the first frequency and the amplitude of the current of the second frequency.

[0016] In a preferred embodiment, the applying unit has a selection unit that selects an electrode pair to be used when applying the current of the first frequency or an electrode pair to be used when applying the current of the second frequency from the first electrode to the fourth electrode based on at least any one of the application period of the current of the first frequency and the application period of the current of the second frequency.

[0017] In a preferred embodiment, the applying unit applies a current of a first RF frequency between the second electrode and the third electrode during a first period, and applies a current of a second RF frequency smaller than the first RF frequency between the first electrode and the fourth electrode during a second period, and the first period and the second period are repeated alternately.

[0018] In a preferred embodiment, the applying unit further continuously applies the current of the second frequency between the first electrode and the fourth electrode during the first period, and further intermittently applies the current of the second frequency between the second electrode and the third electrode during the second period.

[0019] In a preferred embodiment, the beauty device also has a sensor that detects the current applied to the skin between the first electrode and the fourth electrode. When a current with a current value above a specified threshold between the first electrode and the fourth electrode is not applied to the skin within a specified period, the application unit at least stops applying the second frequency.

[0020] In a preferred embodiment, the length of the first period accounts for 70% or more of the entire application time.

[0021] In a preferred embodiment, the interval between the second electrode and the third electrode is 1 mm to 3 mm, and at least one of the intervals between adjacent electrodes is different from the other intervals.

[0022] In a preferred embodiment, each electrode protrudes from the head surface, and a side wall surface of each electrode is inclined with respect to a direction perpendicular to the head surface.

[0023] On the other hand, the present invention provides a current control method for a beauty device having a first electrode, a second electrode, a third electrode, and a fourth electrode, configured so that the distance from the first electrode to the fourth electrode is greater than the distance from the second electrode to the third electrode. The current control method comprises the following steps: a first step, during a first period, applying a current of a first RF frequency between the second electrode and the third electrode while continuously applying a current of a second frequency between the first electrode and the fourth electrode; and a second step, during a second period, applying a current of a second RF frequency lower than the first RF frequency between the first electrode and the fourth electrode while intermittently applying a current of the second frequency between the second electrode and the third electrode. The first RF frequency and the second RF frequency are 200 kHz to 4 MHz, and the second frequency is 1 Hz to 100 kHz. The first and second steps are repeated alternately.

[0024] According to the present invention, currents of different frequencies can be effectively applied simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 1 is an external view of the beauty device 1.

[0026] Figure 2A It is a detailed view of the electrode 10 .

[0027] Figure 2B Examples of variations in the dimensions of the electrode 10 are shown.

[0028] Figure 2CThe results of the sensory test for each variation of the electrode 10 are shown.

[0029] Figure 3 This is a schematic diagram of the internal structure of the beauty device 1.

[0030] Figure 4 This is a schematic diagram of another example of the internal structure of the beauty device 1.

[0031] Figure 5 It is a diagram showing an example of a control mode.

[0032] Figure 6 This is another example of the shape of one electrode constituting the electrode 10 .

[0033] Figure 7 It is a diagram showing another example of the control mode.

[0034] Figure 8 It is a diagram showing temperature changes corresponding to each control content.

[0035] Figure 9 This is a diagram for explaining the difference in temperature change when using electrodes 10 having different inter-electrode distances.

[0036] Figure 10 It is a diagram showing an example of the ratio of the areas between the electrodes.

[0037] Figure 11 It is a diagram showing an example of the shape of the side wall of each electrode.

[0038] Figure 12 It is a diagram showing an example of the shape of the side wall of each electrode.

[0039] Figure 13 It is an exploded view showing an example of the structure of components constituting each electrode.

[0040] Figure 14 2 is a diagram showing the configuration of the housing 100 .

[0041] Figure 15 1 and 2 are diagrams showing a state in which each electrode component is fitted into the housing 100 .

[0042] Figure 16 is a diagram showing an example of the circuit board 200 .

[0043] Figure 17 2 is a diagram showing the structure of the coil spring 201 .

[0044] Figure 18 This is a diagram showing a state where the circuit board 200 is embedded in the housing 100 .

[0045] Figure 19is a cross-sectional view of the electrode 10 . DETAILED DESCRIPTION

[0046] <Example 1>

[0047] Figure 1 This is an external view of the beauty device 1. The beauty device 1 comprises a housing 80, which is held by the user, and an electrode 10, which is located at the front end of the housing 80, where it contacts the skin. Furthermore, the housing 80 is provided with a switch 90, which is operated by the user. In addition to turning the power on and off, the switch 90 is also used to specify the frequency and duration of the applied current, as well as other application-related conditions. Furthermore, the housing 80 is provided with information display elements such as a power connector and an LCD screen, but these are omitted as they are not directly relevant to the present invention.

[0048] Figure 2A This is a detailed diagram of the structure of electrode 10. Electrode 10 includes a first, disc-shaped electrode 11, which is located at the innermost (center) side, and second, third, and fourth electrodes, which are arranged concentrically around first electrode 11. Second electrode 12 is located outside first electrode 11, third electrode 13 is located outside second electrode 12, and fourth electrode 14 is located outside (at the outermost) side of third electrode 13. In a preferred embodiment, d1 is the distance from first electrode 11 to fourth electrode 14, and d2 is the distance from second electrode 12 to third electrode 13, where d1 > d2.

[0049] In addition, it is preferred that the height of each electrode from the housing surface is substantially the same so that the first electrode 11, the second electrode 12, the third electrode 13, and the fourth electrode 14 can contact the skin simultaneously. The width (radial length), area, and spacing between adjacent electrodes are examples.

[0050] For example, the intervals between adjacent electrodes may be such that the distance between the first electrode and the second electrode, the distance between the second electrode and the third electrode, and the distance between the third electrode and the fourth electrode are different from each other.

[0051] Regarding the area of ​​each electrode (excluding the side surface, the area of ​​the annular plane that can contact the skin), it is preferable that the area ratio of the first electrode 11 to the fourth electrode 14 is 1:1 or more and 1:1.7 or less. Figure 2B and Figure 2C The reasons are explained.

[0052] In order to verify the effect of the size and area of ​​each electrode on the user's body sensation, first, Figure 2BAs shown in FIG. 1 , a total of four sample electrodes (No. 1 to No. 4) having different sizes and areas of the first electrode 11 and the fourth electrode 14 were prepared. Figure 2B In the figure, the inner electrode diameter and the inner electrode area refer to the diameter and the area of ​​the first electrode 11 , and the outer electrode inner diameter, the outer electrode outer diameter, and the outer electrode area refer to the inner diameter, the outer diameter, and the area of ​​the fourth electrode 14 , respectively.

[0053] Since the second and third electrodes 12 and 13 are not used for current application, their description is omitted. Furthermore, for all samples, the spacing between adjacent electrodes was 2 mm, and the distance between the first electrode 11 and the fourth electrode 14 was 8 mm. Specifically, the authors examined how differences in physical sensation would occur depending on the area (ratio) of each electrode, while keeping the distance between the first and fourth electrodes 11 and 14 and the distance between adjacent electrodes constant.

[0054] Specifically, a total of 4 sample electrodes were used and current of the same frequency was applied, and responses from 6 subjects were obtained. Figure 2C The answer result is shown in Figure 2C As shown, the order of good physical sensation is No. 1 = No. 2, No. 3, No. 4. Specifically, when arranged in the order of strong muscle stimulation effect, it is No. 1 = No. 2, No. 3, No. 4, and when arranged in the order of strong pain and other discomfort, it is No. 4, No. 3, No. 2 = No. 1. In other words, it can be said that from the perspective of muscle stimulation effect, the ratio of the area of ​​the fourth electrode 14 to the area of ​​the first electrode 11 is preferably 1 to 1.7. In addition, at this time, the outer diameter of the fourth electrode 14 is 32 mm to 37 mm, which is not inferior to existing beauty devices in terms of compactness.

[0055] Figure 3 This is a schematic diagram of the internal structure of the beauty device 1. The beauty device 1 includes an application unit 20 capable of applying a current of a first frequency f1 to the skin between the first electrode 11 and the fourth electrode 14, while simultaneously applying a current of a second frequency f2 to the skin between the second electrode 11 and the third electrode 13. The application unit 20 includes a first power supply circuit 21, a second power supply circuit 22, an isolation transformer 23, an isolation transformer 24, and a control unit 25.

[0056] The first power supply circuit 21 and the second power supply circuit 22 are respectively implemented by coils, resistors, rectifiers, capacitors, clock circuits and other components to generate alternating currents of a first frequency f1 and a second frequency f2, respectively.

[0057] A current of the first frequency f1 is applied between the first electrode 11 and the fourth electrode 14 , and a current of the second frequency f2 is applied between the second electrode 12 and the third electrode 13 .

[0058] The first frequency f1 is, for example, 1 Hz (hertz) to 100 kHz (kilohertz). This frequency band mainly contributes to the muscle stimulation effect (EMS). The second frequency f2 is, for example, 200 kHz to 4 MHz (megahertz), preferably 200 kHz to 2 MHz. This frequency band is a frequency band called radio waves (RF) and mainly contributes to the warming effect. The voltage is, for example, 10 V (volts) to 300 V. The frequency bands that can be generated by the first power supply circuit 21 and / or the second power supply circuit 22 can be separated from each other or partially overlap.

[0059] In short, parameters such as the frequency to be generated can be appropriately set depending on the purpose of applying the current (muscle stimulation, warming, promoting the internal penetration of lotion, etc.). Furthermore, the current waveform can be, for example, an AC sine wave, but can also be a unipolar rectangular wave, a triangular wave, or other pulse train (in which case, the aforementioned frequency can be considered the repetition frequency). Furthermore, the first frequency f1 and / or the second frequency f2 can be variable or fixed.

[0060] Isolation transformers 23 and 24 prevent the flow of current generated by the second power supply circuit 22 and the first power supply circuit 21, respectively, as well as other unintended currents. Specifically, in the present invention, a closed circuit consisting of the first power supply circuit 21, the first electrode 11, and the fourth electrode 14, and a closed circuit consisting of the second power supply circuit 22, the second electrode 12, and the third electrode 13 are formed. While two currents are applied simultaneously to the skin, the provision of isolation transformers 23 and 24 prevents current from flowing from the other closed circuit into one closed circuit.

[0061] The control unit 25 is a switching mechanism or a processor, etc., which provides an on / off signal or a control signal indicating the current distribution to be generated (application time, frequency, voltage, waveform, etc.) to the first power supply circuit 21 and the second power supply circuit 22 according to the instruction received via the switch 90.

[0062] According to this embodiment, when f1 < f2, for example, when the first frequency f1 is primarily for muscle stimulation and the second frequency f2 is primarily for warming, two currents can be applied simultaneously while simultaneously achieving an electrode configuration suitable for applying the first frequency f1 and an electrode configuration suitable for applying the second frequency f2. As a result, it is possible to effectively impart both a muscle stimulation effect and a warming effect to substantially the same skin location.

[0063] Here, for example, in the case where it is desired to achieve both muscle stimulation and warming effects by alternately switching between applying a current at a frequency for muscle stimulation and a current at a frequency for warming using the same electrode, if the current at the frequency for muscle stimulation is applied at an inter-electrode distance suitable for exerting a warming effect, the range of muscles to be stimulated becomes narrower. In addition, for example, if the electrodes for applying the current at a frequency for muscle stimulation and the electrodes for applying the current at a frequency for achieving a warming effect are physically separated, the restrictions on the usable frequency band become greater.

[0064] In contrast, according to this embodiment, multiple electrodes are arranged concentrically, with an inter-electrode distance suitable for applying frequencies required to achieve muscle stimulation and warming effects. This allows for simultaneous application of appropriate muscle stimulation and warming effects over a wide area of ​​the skin. This results in a shorter user experience compared to, for example, methods that switch frequencies. Furthermore, there's no need for time-sharing control to switch application timing, simplifying the circuit structure.

[0065] Furthermore, the use of annular electrodes allows for reliable contact between the electrode pair and the skin, resulting in a stable current flowing through the skin and reduced discomfort for the user. This allows even users unfamiliar with operating the device of this embodiment to use it without worrying about the direction of contact between the electrodes 10 and the skin or the amount of force applied, unlike when rectangular electrodes are positioned opposite each other.

[0066] Furthermore, by arranging the electrodes on concentric circles, the electrode area can be ensured and the size of the portion in contact with the skin can be made compact, thereby improving the overall design and operability of the beauty device.

[0067] Furthermore, by setting the area ratio of each electrode within the above-mentioned value range, discomfort such as severe pain and localized fever can be alleviated.

[0068] <Example 2>

[0069] Figure 4 This is a schematic diagram of another example of the internal structure of the beauty device 1.

[0070] In this example, a control unit 25A is used instead of the control unit 25, and an application unit 20A is used instead of the application unit 20. The application unit 20A includes a selection unit 26 between the first power supply circuit 21 and the second power supply circuit 22 and each electrode. The control unit 25A determines to which of the first to fourth electrodes 11 to 14 the current generated by the first power supply circuit 21 and the second power supply circuit 22 is applied, and provides a control signal to the selection unit 26. The selection unit 26 is composed of a switching circuit and the like, and switches the wiring according to the control signal provided by the control unit 25A.

[0071] In a preferred embodiment, the selection unit 26 selects, from the first to fourth electrodes, an electrode pair to be used when applying a current having the first frequency or an electrode pair to be used when applying a current having the second frequency, based on at least one of the values ​​of the first frequency and the second frequency. Thus, an electrode pair suitable for the frequency is selected.

[0072] In another embodiment, the selection unit 26 selects, from the first to fourth electrodes, an electrode pair to be used when applying the current of the first frequency or an electrode pair to be used when applying the current of the second frequency based on at least one of the amplitude of the current of the first frequency and the amplitude of the current of the second frequency. Thus, the electrodes appropriate for the applied current intensity are determined.

[0073] In another embodiment, the selection unit 26 selects, from the first to fourth electrodes, an electrode pair to be used when applying the current of the first frequency or an electrode pair to be used when applying the current of the second frequency, based on at least one of the application period of the current of the first frequency and the application period of the current of the second frequency. Thus, electrodes appropriate for the application period are selected.

[0074] When a plurality of operation modes can be selected in the beauty device 1, the electrodes to be used can be selected according to the operation mode. For example, a memory is provided in the control unit 25A, and the memory stores Figure 5 Here, the action mode may be directly specified by the user via switch 90, or the control unit 25A may determine the action mode using a predetermined algorithm based on the purpose, frequency, amplitude (intensity), application time, and other application-related parameters specified by the user via switch 90.

[0075] In this Figure 5 In the example of , it is specified to which electrode the first frequency f1 and the second frequency f2 are applied (or both) according to the operation mode. Figure 5 The (+) and (-) in the figure represent the anode and cathode of the electrode pair, respectively.

[0076] More specifically, in operation mode 1, a current of f1 is applied between the first electrode 11 and the fourth electrode 14, while a current of f2 is applied between the second electrode 12 and the third electrode 13. In operation mode 2, a current of f1 is applied only between the first electrode 11 and the fourth electrode 14. In operation mode 3, a current of f2 is applied only between the second electrode 12 and the third electrode 13. In operation mode 4, a current of f1 is applied between the first electrode 11 and the third electrode 13, while a current of f2 is applied between the second electrode 12 and the fourth electrode 14. Compared to operation mode 1, different electrodes are used. This is effective when f1 and f2 are relatively close in value. In operation mode 5, the first electrode 11 and the second electrode 12 are set to the same potential, and the third electrode 13 and the fourth electrode 14 are set to the same potential. This allows the first electrode 11 and the second electrode 12 to function as a single electrode (e.g., an anode), and the third electrode 13 and the fourth electrode 14 to function as a single electrode (e.g., a cathode), and a current of a single frequency is applied to this electrode pair. It is conceivable that this operating mode could be selected when the area of ​​the electrode in contact with the skin may affect the physical sensation, and the goal is to increase the apparent area of ​​the contacting electrode to improve the effect experience. For the same purpose, in operating mode 6, the second electrode 12, the third electrode 13, and the fourth electrode 14 function as one of the electrode pairs.

[0077] In this way, electrodes can be flexibly selected according to the purpose, frequency and other application methods.

[0078] The innermost first electrode 11 may be ring-shaped instead of disk-shaped. In this case, a mechanism such as an LED that irradiates light to the skin may be provided in the space formed in the center of the first electrode 11 .

[0079] Furthermore, as long as the electrodes are arranged concentrically and have different diameters, the number of electrodes included in the electrode 10 may be 5 or more. Increasing the number of concentrically arranged annular electrodes increases the types of currents that can be applied simultaneously.

[0080] In addition, each electrode may not be a perfect circular ring, but may be an elliptical ring, a rectangular ring, a polygonal ring (such as a rounded triangle) ring, a heart-shaped ring or other hollow shapes. That is, the "ring-shaped" in the present invention can be any hollow structure, for example, Figure 6 As shown, the shape in which the protrusion is formed on the annular member may have an outer shape or an inner diameter that deviates from a circle.

[0081] However, it is preferred that at least the distance between the electrodes that make up the electrode pair (e.g., the first electrode 11 and the fourth electrode) is constant regardless of their position (in other words, the shapes of the two electrodes are similar). When the distance between the electrodes is constant, the amount of current applied to the skin and the sensation given to the user become uniform.

[0082] <Example 3>

[0083] The applying unit 20 may apply a current of a first RF frequency between the second electrode 12 and the third electrode 13 during a first period, and apply a current of a second RF frequency, which is lower than the first RF frequency, between the first electrode 11 and the fourth electrode 14 during a second period. Furthermore, the first period and the second period may be repeated alternately.

[0084] In addition, the applying unit 20 may further continuously apply the current of the second frequency between the first electrode and the fourth electrode during the first period, and further intermittently apply the current of the second frequency between the second electrode and the third electrode during the second period.

[0085] Figure 7 A specific example of such current application control is shown. In this example, the applied AC current is roughly divided into two types: RF current and EMS current. In addition, the interval between the second electrode 12 and the third electrode 13 is 2 mm, and the interval between the first electrode 11 and the fourth electrode 14 is 8 mm.

[0086] If the Figure 7 As shown, the application periods T0, T1, and T2 are set in sequence from the time the power is turned on. During the period T0, the first electrode 11 and the fourth electrode 14 are used to pass an EMS current of 71Hz to 100Hz for 30 seconds. At the same time, the second electrode 12 and the third electrode 13 are used to pass an RF current of 2MHz. Here, with respect to the RF current, the closer the distance between the two electrodes used during application, the higher the warming effect. On the other hand, with respect to the EMS current, if the distance between the electrodes is longer, a better physical sensation can be obtained (the user is less likely to feel discomfort such as numbness), and stimulation can be given to a wide range of muscles (thereby activating the muscles). That is, during the period T0 just after the power is turned on, the second electrode 12 and the third electrode 13, which are an electrode pair suitable for imparting a warming effect, are used to first fully heat the skin, while the first electrode 11 and the fourth electrode 14, which are an electrode pair suitable for thoroughly activating the muscles, are used to stimulate the muscles in a manner that separates the area of ​​the skin being heated.

[0087] During the period T1 following the period T0, the electrodes used are switched, and an RF current (1 MHz) is applied between the first electrode 11 and the fourth electrode 14 for 2 seconds. At the same time, an EMS current (1 kHz) is passed through the second electrode 12 and the third electrode 13 at a repetition frequency of 10 Hz. By using the first electrode 11 and the fourth electrode 14, which are the combination with the greatest distance between the electrodes when applying the RF current, a wide range can be heated. On the other hand, as described above, since the distance between the electrodes used in the application becomes closer, the stimulation to the body senses becomes stronger (the discomfort increases), and therefore the EMS current is passed intermittently (i.e., there is a period during which the EMS current does not flow). In addition, although a frequency such as 1 kHz is relatively less uncomfortable, it is not easy to cause muscle contraction. However, by passing the current intermittently, it also has the effect of promoting muscle contraction compared to the case of passing the current continuously.

[0088] During period T2, following period T1, an RF current (2 MHz) is passed between the second electrode 12 and the third electrode 13 for 10 seconds, and an EMS current (71 Hz to 100 Hz) is passed between the first electrode and the fourth electrode for 10 seconds. Specifically, a 2 MHz current, a frequency suitable for a warming effect, is applied using an electrode pair suitable for applying RF current. This results in a sufficient rise in skin temperature, improved blood circulation, and electrical stimulation acting on loose muscles. In other words, a combined effect of muscle stimulation from the EMS current and the warming effect from the RF current can be expected.

[0089] Next, the period T1 and period T2 are repeated, for example, for 6 minutes, and the operation is terminated. Thus, by using an electrode pair suitable for applying RF current, applying a first RF frequency that is expected to achieve rapid heating during the first period (T1), and applying a second RF frequency with reduced heating capacity to a large area during the second period (T2), both rapid heating and temperature stability (preventing overheating) can be achieved.

[0090] The lengths of the aforementioned periods T0, T1, and T2 are examples. Period T0 is preferably 20 to 40 seconds, period T1 is preferably 2 to 10 seconds, and period T2 is preferably 5 to 15 seconds. Furthermore, from the perspective of maintaining skin temperature, the length of the first period T1 preferably accounts for 70% to 80% or more of the total application time.

[0091] Here, right Figure 7 The reason why 1 MHz or 2 MHz is used as the RF current in the example is described in detail. Figure 8 1 and 2 are experimental results showing how the temperature changes when three different RF current application patterns are applied for a total of 90 seconds.

[0092] (I) shows the temperature change when a 2 MHz RF current is continuously applied between the second electrode 12 and the third electrode 13 for 90 seconds. (II) shows the temperature change when a 2 MHz RF current is continuously applied between the second electrode 12 and the third electrode 13. Figure 7 As shown in FIG. 1 , a 1 MHz RF current is passed between the second electrode 12 and the third electrode 13 for 2 seconds, followed by a 2 MHz RF current passed between the first electrode 11 and the fourth electrode 14 for 10 seconds. The 2-second and 10-second cycles of applying the 1 MHz RF current are repeated. (III) shows the temperature change when a 1 MHz RF current is continuously applied between the first electrode 11 and the fourth electrode 14 for 90 seconds.

[0093] As can be seen from the figure, in the cases of (I) and (II), the temperature of the skin, which is preferred for skin care, is maintained at around 40 degrees, whereas in the case of (III), it does not reach 40 degrees. This is because the distance between the electrodes used is larger than in the case of (I), so the warming effect cannot be fully exerted. On the other hand, even if 1MHz and 2MHz are applied alternately while switching the electrodes used as in (II), the same warming effect as in the case of continuously applying 2MHz as in (I) can be obtained. Here, when applying RF current as in (I), the electrodes using the simultaneously applied EMS current can only be the second electrode 12 and the third electrode 13, so in this case, as described above, the physical sensation deteriorates. In contrast, by applying RF current as in (II) (i.e. Figure 7 ) by switching electrodes in the same manner, it is possible to take into account both the warming effect brought by the RF current and the effect of preventing the deterioration of the body sensation caused by the EMS current.

[0094] The reason for setting the inter-electrode distance to 2 mm will be described in detail.

[0095] Figure 9 This is a graph showing how the temperature of the skin changes according to the distance between the two concentric ring electrodes and the difference in the applied RF current. Figure 9 In the figure, (a) is the case where the RF current is 1 MHz and the distance between electrodes is 3 mm, and (b) is the case where the RF current is 2 MHz and the distance between electrodes is 2 mm. Figure 9 As shown, it can be confirmed that the rapid heating property of the case (b) is excellent (having the effect of heating faster). In addition, the experiment shows that if the distance between the electrodes is set to 1mm, the body will feel uncomfortable (overheated). Based on the above, Figure 7In the example, 2 mm is set as the preferred electrode spacing when applying RF current. In other words, the spacing between the second electrode 12 and the third electrode 13 is preferably 1 to 3 mm. Furthermore, at least one of the spacings between adjacent electrodes among electrodes 11 to 14 is different from the others. This increases the variation in inter-electrode distance when using any two electrodes.

[0096] <Example 4>

[0097] exist Figure 10 An example of the area (size) of each electrode is shown in FIG. The area of ​​the first electrode 11 to the fourth electrode 14 is 118.0 mm 2 , 113.7mm 2 、170.6mm 2 、164.6mm 2 In this case, it is preferable that the distance between any two electrodes be approximately 1.0 to 1.5 times the distance between them. This is because, in an electrode pair used to apply RF current or EMS current, if the area ratio of the other electrode to one electrode increases, the warming effect and stimulation effect will be reduced, and the physical sensation will be worsened.

[0098] <Example 5>

[0099] Regarding the three-dimensional shape of each electrode 11 to 14, the cross section does not need to be rectangular. Figure 11 As shown, the side surface (side wall surface) of the fourth electrode 14 may be inclined at a predetermined angle (35 degrees in this case) relative to the direction C1 perpendicular to the ground plane SS (head surface) of the electrode 10. The predetermined angle is set so that the side surface of the fourth electrode 14 is continuous with the edge surface (C2) of the head of the housing 80 (see Figure 12 ). As a result, not only the surface ST of the fourth electrode 14 but also the side SW can come into contact with the skin. As a result, the effective electrode area of ​​the fourth electrode 14 increases, and the current applied using the fourth electrode 14 increases.

[0100] <Example 6>

[0101] use Figures 13-19 An example of the internal structure of the electrode 10 will be described.

[0102] Figure 13 This is an exploded view showing an example of the structure of the components constituting each of the electrodes 11 to 14. Each of the electrodes 11 to 14 has a shape in which three protrusions are formed on a metal ring. Figure 14 and Figure 15 The structure of the housing 100 in which these metal rings are embedded (buried and fixed) is shown.

[0103] Figure 161 is a diagram showing a circuit board 200 for applying voltage to a housing 100 in which a metal ring group is embedded. Figure 17 A conical (pointed) coil spring 201 as shown.

[0104] Figure 18 and Figure 19 The figure shows a circuit board 200 assembled with a housing 100 in which a metal ring assembly is embedded. As shown in this figure, coil springs 201 abut against the protrusions of the electrode components, pressing the electrode components toward the housing 100, thereby securing the electrode components via coil springs 201. Coil springs 201 are preferably conical (e.g., triangular pyramid, circular cone), with the area of ​​the apex being no more than 50% of the area of ​​the base.

[0105] When treating narrow areas like the face, the size of the head is limited. If multiple electrodes are arranged concentrically, the width of each electrode must be reduced. For example, the electrode width may be 2 mm or less. To address this issue, the electrodes are designed to protrude from the insulating portion and current is supplied via a pointed coil spring, ensuring stable current flow even with thin electrodes.

[0106] <Example 7>

[0107] Alternatively, a sensor may be provided between the first electrode 11 and the fourth electrode to detect the current applied to the skin. If the skin is not in full contact with the electrode, the RF current is not passed. Incomplete contact between the skin and the electrode may cause overheating of the skin, and the purpose of preventing this by not passing the RF current is to prevent such a situation.

[0108] For example, if a current with a value greater than a predetermined threshold value between the first electrode and the fourth electrode is not applied to the skin for a predetermined period of time, the application unit 20 stops applying at least the second frequency. More specifically, a small RF voltage is applied between the first electrode 11 and the fourth electrode 14, and the difference in applied current value (amplitude) between when not in contact with the skin and when in contact with the skin is detected. Whether the electrode (the entire surface) is in contact with the skin is determined based on whether this difference exceeds a threshold value. For example, the following is an example.

[0109] When the power is on, it is determined that there is no contact with the skin.

[0110] When a current value of the first threshold value flows for 50 ms or longer after it is determined that the device is not in contact with the skin, it is determined that the device is in contact with the skin.

[0111] If a current value equal to or greater than the first threshold value continues to flow for 25 ms or longer after skin contact is determined, it is determined that skin contact continues.

[0112] If the current value is below the second threshold value for more than 3 seconds after the skin contact is determined, it is determined that the skin has been separated (no longer in contact with the skin).

[0113] <Example 8>

[0114] The electrodes 11 to 14 do not need to be arranged on concentric circles. In a preferred embodiment, the beauty device 1 only needs to include a first electrode, a second electrode, a third electrode, and a fourth electrode, and the distance from the first electrode to the fourth electrode is greater than the distance from the second electrode to the third electrode.

[0115] This electrode configuration includes a first step of applying a current of a first RF frequency between the second and third electrodes during a first period while continuously applying a current of a second frequency between the first and fourth electrodes; and a second step of applying a current of a second RF frequency, which is lower than the first RF frequency, between the first and fourth electrodes while intermittently applying the second frequency between the second and third electrodes during a second period. The first RF frequency is 200 kHz to 4 MHz, and the second frequency is 1 Hz to 100 kHz. These first and second steps are repeated alternately. This achieves both the warming effect of the first RF frequency and the muscle stimulation effect of the second RF frequency.

[0116] Description of labels

[0117] 1: Beauty device; 10: Electrode; 11: First electrode; 12: Second electrode; 13: Third electrode; 14: Fourth electrode; 20: Application unit; 21: First power circuit; 22: Second power circuit; 23: Isolation transformer; 24: Isolation transformer; 25: Control unit; 26: Selection unit; 80: Housing; 90: Switch; 100: Case; 200: Circuit board.

Claims

1. A beauty device comprising: a first electrode; a second electrode, a third electrode, and a fourth electrode, each of which is an annular electrode arranged concentrically around the first electrode, the second electrode being arranged outside the first electrode, the third electrode being arranged outside the second electrode, and the fourth electrode being arranged outside the third electrode; and The applying unit is capable of applying a current of a first frequency to the skin between at least the first electrode and the fourth electrode, and applying a current of a second frequency higher than the first frequency to the skin between the second electrode and the third electrode.

2. The beauty device according to claim 1, wherein The first frequency is 1Hz~100kHz, The second frequency is 200kHz to 4MHz.

3. The cosmetic device according to claim 1 or 2, wherein: The cosmetic device further includes a selection unit that selects an electrode pair used when applying current of the first frequency or an electrode pair used when applying current of the second frequency from among the first to fourth electrodes, based on at least either a value of the first frequency or a value of the second frequency.

4. The cosmetic device according to claim 1 or 2, wherein: The beauty device further includes a selection unit that selects an electrode pair to be used when applying the current of the first frequency or an electrode pair to be used when applying the current of the second frequency from the first to fourth electrodes based on at least any one of the amplitude of the current of the first frequency and the amplitude of the current of the second frequency.

5. The cosmetic device according to claim 1 or 2, wherein: The beauty device further includes a selection unit that selects an electrode pair to be used when applying the current of the first frequency or an electrode pair to be used when applying the current of the second frequency from the first to fourth electrodes, based on at least any one of a period of application of the current of the first frequency and a period of application of the current of the second frequency.

6. The cosmetic device according to claim 2, wherein: The applying unit applies a current of a first RF frequency belonging to the frequency band of the second frequency between the second electrode and the third electrode during a first period, and applies a current of a second RF frequency belonging to the frequency band of the second frequency and lower than the first RF frequency between the first electrode and the fourth electrode during a second period. The first period and the second period are repeated alternately.

7. The cosmetic device according to claim 6, wherein: The applying unit further continuously applies the current of the second frequency between the first electrode and the fourth electrode during the first period, and further intermittently applies the current of the second frequency between the second electrode and the third electrode during the second period.

8. The cosmetic device according to claim 2, wherein: The beauty device further includes a sensor that detects a current applied to the skin between the first electrode and the fourth electrode. The applying unit stops applying at least the second frequency when a current having a current value greater than or equal to a predetermined threshold value is not applied to the skin between the first electrode and the fourth electrode for a predetermined period of time.

9. The cosmetic device according to claim 6 or 7, wherein: The length of the first period accounts for 70% or more of the entire application time.

10. The cosmetic device according to claim 1 or 2, wherein: The distance between the second electrode and the third electrode is 1 mm to 3 mm. At least one of the intervals between adjacent electrodes is different from the other intervals.

11. The cosmetic device according to claim 1 or 2, wherein: Each electrode protrudes from the head surface, and a side wall surface of each electrode is inclined with respect to a direction perpendicular to the head surface.

12. A cosmetic device comprising a first electrode, a second electrode, a third electrode, and a fourth electrode, wherein a distance from the first electrode to the fourth electrode is greater than a distance from the second electrode to the third electrode. The cosmetic device has an application unit, The applying unit is capable of performing the following actions: The first operation is to apply a current of a first RF frequency of 200 kHz to 4 MHz between the second electrode and the third electrode, and to continuously apply a current of a second frequency of 1 Hz to 100 kHz between the first electrode and the fourth electrode during a first period. A second operation comprises applying a current of a second RF frequency of 200 kHz to 4 MHz, which is lower than the first RF frequency, between the first electrode and the fourth electrode, and intermittently applying a current of the second frequency between the second electrode and the third electrode during a second period; and Repeat the first action and the second action alternately.

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