Skin management device

Abstract

The present invention relates to a skin management device comprising: a main body comprising a first terminal; and a head that alternately applies frequencies different from each other to the plurality of electrodes at a set cycle so as to uniformly transfer high-frequency thermal energy from the upper layer of dermis to the lower layer of dermis in the RF mode.

Description

Technical Field

[0001] The present invention relates to the following skin care equipment: different frequencies are applied alternately to a plurality of electrodes at a set period, so that high-frequency heat energy is evenly transferred from the upper dermis to the lower dermis, the electrodes arranged on the inner side of the plurality of electrodes form a movement channel for cosmetics (dosage form), and the electrodes arranged on the outermost side do not form a movement channel, so that the cosmetics are evenly dispersed only on the inner side of the head when in use. Background Art

[0002] Human skin can be polluted by external activities and wrinkles can form due to aging, hormonal changes, etc. In recent years, as the attention to skin has increased, cleaning equipment that can effectively remove skin pollution and various equipment for skin beauty and anti-aging have been developed.

[0003] For example, a device that applies high frequency or infrared energy to the skin has been developed. The device is a device that applies heat energy to the skin, and applies heat energy to the skin to improve the elasticity of the applied skin area or effectively provide beauty products to the inside of the skin.

[0004] In addition, devices that provide sound waves and light to the skin have been developed. For example, sonophoresis and laser poration devices have been developed to provide beauty products into the skin using ultrasound or laser. The devices use ultrasound or laser to form a path in the skin for injecting cosmetics, thereby increasing the skin penetration rate of skin beauty products.

[0005] In addition, devices have been developed that physically deliver beauty products to the skin using less current. For example, devices that utilize iontophoresis, electroporation, electroosmosis, etc. are devices that can effectively deliver active ingredients to the inside of the skin by applying current to charged or neutral beauty products.

[0006] That is, various devices have been developed that can provide skin beauty and anti-aging functions using light energy, sound waves, electric current, vibration, etc.

[0007] In general, high-frequency beauty equipment is used as a device for skin care by applying electrical stimulation to the skin, and can provide electrical stimulation of the high-frequency band to the skin. The high-frequency equipment is explained in detail as follows: When high frequency is applied to the skin, friction heat, i.e. deep heat, is generated as ions in the cells move from the cathode to the anode. The deep heat is about 40°C to about 50°C, and the skin can be sterilized by the deep heat. In addition, the blood vessels inside the skin are enlarged by the deep heat, and the metabolic function becomes smooth, so that beauty products can be effectively provided to the inside of the skin.

[0008] Therefore, the device using high frequency includes electrodes formed on the surface, and the electrodes are in contact with the user's skin. However, when the device is used on a curved skin area such as the face, the electrodes cannot smoothly contact the skin. As a result, there is a problem that excessive high frequency is provided to a part of the area, causing skin damage such as burns, and high frequency cannot be provided to another part of the area.

[0009] In addition, the electrodes of the device are generally protruding from the surface of the device in order to contact the skin. In this case, when the user holds the device to massage the skin, the protruding electrodes cannot naturally massage curved skin areas such as the cheeks, chin, and both corners of the eyes.

[0010] Therefore, a new skin care device that can solve the above problems is needed. Summary of the invention

[0011] Technical issues

[0012] The present invention is developed to solve the problems in the prior art as mentioned above. The purpose of the present invention is to provide a skin management device as follows: high-frequency heat energy is evenly transferred from the upper dermis to the lower dermis, and when used, cosmetics are evenly dispersed only on the inner side of the head.

[0013] Solutions to technical issues

[0014] According to one aspect of the present invention, a skin management device includes: a main body, which includes a first terminal; and a head, which is connected to the main body and can be detached from the main body, the head includes: a shell, which includes a storage space inside; a substrate, which is arranged in the shell; an electrode part, which is arranged in the shell and on the substrate; and a second terminal, which is arranged at the lower part of the substrate and electrically connected to the first terminal of the main body, the electrode part includes: a first electrode, which is arranged in the center of the head; a second electrode, which surrounds the first electrode and is arranged at equal intervals; a third electrode, which surrounds the second electrode and is arranged at equal intervals; and a fourth electrode, which surrounds the third electrode and is arranged at equal intervals, the first electrode, the second electrode, the third electrode, and the fourth electrode operate in a first RF mode, and in the first RF mode, different frequencies are applied alternately to any two electrodes of the first electrode, the second electrode, the third electrode, and the fourth electrode at a set period, so that high-frequency heat energy is evenly transferred from the upper dermis to the lower dermis.

[0015] Specifically, in the above-mentioned first RF mode, the frequencies to be used for the above-mentioned first electrode, second electrode, third electrode, and fourth electrode are set to four frequencies within the (high frequency) range of 1MHz to 3MHz, and the four frequencies are set to the first frequency, the second frequency, the third frequency, and the fourth frequency in order from long to short.

[0016] Specifically, the first frequency is set to 2.2 MHz, the second frequency is set to 1.8 MHz, the third frequency is set to 1.4 MHz, and the fourth frequency is set to 1.0 MHz.

[0017] Specifically, it also includes an acceleration mode, which is used to quickly transfer heat to the skin before starting the above-mentioned first RF mode. The above-mentioned acceleration mode is started by selecting any one level from acceleration level 1, acceleration level 2, and acceleration level 3 set in the order of acceleration time from short to long, and the above-mentioned acceleration mode is supplied with the above-mentioned first frequency current to the above-mentioned third electrode and fourth electrode with a duty cycle of 100%, a negative current is applied to one of the above-mentioned third electrode and fourth electrode, and a positive current is applied to the other electrode.

[0018] Specifically, in the first RF mode, the first RF mode is automatically executed during a specified time period from the time point when the acceleration mode is ended, and when the specified time has passed, the first RF mode is automatically interrupted, and the first RF mode is executed in the following manner divided into step 1 and step 2: when currents of any two frequencies of the first frequency, the second frequency, the third frequency, and the fourth frequency are alternately applied to any two electrodes of the first electrode, the second electrode, the third electrode, and the fourth electrode at a set period, current is not supplied to the other two electrodes.

[0019] Specifically, in the first RF mode, in step 1, currents of the second frequency and the fourth frequency are applied alternately to the first electrode and the second electrode respectively for several to several tens of times with a period of less than 1 second during the first set time, and in step 2, currents of the first frequency and the third frequency are applied alternately to the third electrode and the fourth electrode respectively for several to several tens of times with a period of less than 1 second during the first set time, a negative current is applied to one of the first and second electrodes or the third and fourth electrodes, and a positive current is applied to the other electrode, and step 1 and step 2 are alternately performed with a gap of the second set time during which no current is supplied to the first, second, third and fourth electrodes respectively.

[0020] Specifically, the first set time becomes longer from the acceleration level 1 to the acceleration level 3, and the second set time becomes relatively shorter from the acceleration level 1 to the acceleration level 3.

[0021] Specifically, after the acceleration mode, the first RF mode is repeatedly executed for a predetermined time in the order of step 1 -> step 2 -> step 1 -> step 2.

[0022] Specifically, the first electrode, the second electrode, the third electrode, and the fourth electrode operate in the first EMS mode instead of the first RF mode. In the first EMS mode, the first EMS mode is performed by dividing into step 3, step 4, and step 5 as follows: when a current of the fifth frequency is applied to any two electrodes of the first electrode, the second electrode, the third electrode, and the fourth electrode at a set period, no current is supplied to the other two electrodes. In the step 3, a current of the fifth frequency is applied to the third electrode and the fourth electrode, respectively. In the step 4, a current of the fifth frequency is applied to the first electrode and the fourth electrode, respectively. In the step 5, a current of the fifth frequency is applied to the first electrode and the second electrode, respectively. A negative current is applied to one of the third electrode and the fourth electrode, the first electrode and the fourth electrode, or the first electrode and the second electrode, and a positive current is applied to the other electrode.

[0023] Specifically, in the first EMS mode, in each of the steps 3, 4 and 5, any one of stimulation level 1, stimulation level 2 and stimulation level 3 which are set in order of stimulation time from short to long in a manner that makes the stimulation time different is selected and executed, and between the steps 3, 4 and 5, no current is supplied to the first electrode, the second electrode, the third electrode and the fourth electrode, respectively, during a specified time period.

[0024] Specifically, the first EMS mode is performed by repeating the order of step 3 -> step 4 -> step 5 -> step 4 -> step 3 -> step 4 -> step 5 -> step 4 for a predetermined time.

[0025] Specifically, the first electrode, the second electrode, the third electrode and the fourth electrode work in the RF+EMS mode instead of the first RF mode, so that the second RF mode is executed in any two electrodes of the first electrode, the second electrode, the third electrode and the fourth electrode, and the second EMS mode is executed in the other two electrodes, which is divided into step 6, step 7 and step 8 to execute the RF+EMS mode.

[0026] Specifically, in the above-mentioned step 6, the above-mentioned first electrode and the second electrode execute the above-mentioned second RF mode, and the above-mentioned third electrode and the fourth electrode execute the above-mentioned second EMS mode. In the above-mentioned step 7, the above-mentioned second electrode and the third electrode execute the above-mentioned second RF mode, and the above-mentioned first electrode and the fourth electrode execute the above-mentioned second EMS mode. In the above-mentioned step 8, the above-mentioned third electrode and the fourth electrode execute the above-mentioned second RF mode, and the above-mentioned first electrode and the second electrode execute the above-mentioned second EMS mode.

[0027] Specifically, in the second RF mode, the frequencies used for the first electrode, the second electrode, the third electrode and the fourth electrode are set to four frequencies within the high frequency range of 1 MHz to 3 MHz, and the four frequencies are set to a first frequency, a second frequency, a third frequency and a fourth frequency in order from long to short. In the second EMS mode, the frequencies used for the first electrode, the second electrode, the third electrode and the fourth electrode are set to a fifth frequency within the low frequency range.

[0028] Specifically, it also includes an acceleration mode, which is used to quickly transfer heat to the skin before starting the above-mentioned second RF mode. In the above-mentioned acceleration mode, any one of acceleration level 1, acceleration level 2, and acceleration level 3 set in the order of acceleration time from short to long is selected to work, and the above-mentioned first frequency current is supplied to the above-mentioned third electrode and fourth electrode with a duty cycle of 100%, a negative current is applied to one of the above-mentioned third electrode and fourth electrode, and a positive current is applied to the other electrode.

[0029] Specifically, in the second RF mode, in step 6, during the first set time, currents of the first frequency and the second frequency are applied alternately to the first electrode and the second electrode respectively for several to several tens of times with a period of less than 1 second, in step 7, during the first set time, currents of the second frequency and the third frequency are applied alternately to the second electrode and the third electrode respectively for several to several tens of times with a period of less than 1 second, in step 8, during the first set time, currents of the third frequency and the fourth frequency are applied alternately to the third electrode and the fourth electrode respectively for several to several tens of times with a period of less than 1 second, a negative current is applied to one of the first electrode and the second electrode, the second electrode and the third electrode, or the third electrode and the fourth electrode, and a positive current is applied to the other electrode, and the first electrode and the second electrode are connected to each other through the first electrode and the third electrode. The first electrode, the second electrode, the third electrode, and the fourth electrode respectively perform step 6, step 7, and step 8 alternately with intervals of the second set time during which no current is supplied to the third electrode, the second electrode, the third electrode, and the fourth electrode, respectively. The first set time becomes longer as the acceleration level 1 becomes longer, and the second set time becomes relatively shorter as the acceleration level 1 becomes shorter. In the second EMS mode, in step 6, the current of the fifth frequency is applied to the third electrode and the fourth electrode respectively, in step 7, the current of the fifth frequency is applied to the first electrode and the fourth electrode respectively, and in step 8, the current of the fifth frequency is applied to the first electrode and the second electrode respectively. A negative current is applied to one of the third electrode and the fourth electrode, the first electrode and the fourth electrode, or the first electrode and the second electrode, and a positive current is applied to the other electrode.

[0030] Specifically, in the second EMS mode, in each of the steps 6, 7 and 8, any one of stimulation levels 1, 2 and 3, which are set in order of stimulation time from short to long in a manner that makes the stimulation time different, is selected and executed, and between the steps 6, 7 and 8, no current is supplied to the first electrode, the second electrode, the third electrode and the fourth electrode, respectively, during a specified time period.

[0031] Specifically, in the second RF mode and the second EMS mode, the RF+EMS mode is repeatedly executed for a specified time in the order of step 6 -> step 7 -> step 8 -> step 7 -> step 6 -> step 7 -> step 8 -> step 7.

[0032] Effects of the Invention

[0033] The skin management device of the present invention alternately applies different frequencies to multiple electrodes at a set period, so that high-frequency heat energy is evenly transferred from the upper dermis to the lower dermis in RF mode, which can maximize the skin improvement effect.

[0034] In addition, the skin care device of the present invention forms a movement channel for cosmetics (dosage form) at the inner electrodes among the plurality of electrodes, so that the cosmetics can be evenly spread toward the electrodes along the movement channel during use.

[0035] In addition, the skin care device of the present invention does not form a movement channel on the outermost electrodes among the plurality of electrodes, so that the cosmetics can be evenly spread only on the inner side of the head during use.

[0036] In addition, the skin management device of the present invention combines high frequency and low frequency on multiple electrodes for use. By using electrodes working in RF mode, high-frequency heat energy is evenly transferred from the upper dermis to the lower dermis. By using electrodes working in EMS (Electrical Muscle Stimulation) mode, muscle pain can be eliminated and muscles can be activated, thereby further maximizing the skin improvement effect.

[0037] In addition, the skin management device of the present invention provides light of various wavelength bands to the user's skin through light-emitting elements, thereby not only maximizing cosmetic effects such as inducing collagen formation on the user's skin and reducing fine lines, but also providing therapeutic effects such as calming the area to which light of various wavelength bands is applied or alleviating the inflammation formed.

[0038] In addition, the skin care device of the present invention can remove and assemble a head with multiple electrodes from the main body, so that when the head is damaged or malfunctions, only the head can be replaced, thereby having higher efficiency. In addition, when the user wants to use additional functions in addition to the functions included in the head, there is no need to purchase or possess a skin care device with the additional functions, and the head including the additional functions can be connected to the main body for use, thereby allowing the user to use the skin care device economically and effectively.

[0039] In addition, the skin care device of the present invention can not only supply high-frequency / low-frequency current to multiple electrodes, but also supply at least one current selected from Galvanic current and microcurrent, which can form deep heat in the user's skin, activate muscles, and promote the production of adenosine triphosphate (ATP), thereby effectively delivering cosmetics or drugs to the inside of the skin.

[0040] In addition, in the skin management device of the present invention, the surface of the head of the multiple electrodes that contacts the user's skin is formed into a curved shape, so that it can effectively adhere to relatively curved areas such as the chin, cheeks, and corners of the eyes. As a result, the multiple electrodes will not be separated from the skin, but will effectively contact the skin, thereby effectively massaging the user's skin. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a perspective view of a skin care device according to an embodiment of the present invention.

[0042] Figure 2 It is an exploded perspective view of a skin care device according to an embodiment of the present invention.

[0043] Figure 3 This is a rear perspective view of the head of the skin care device according to one embodiment of the present invention.

[0044] Figure 4 This is a front view of a head portion of a skin care device according to an embodiment of the present invention.

[0045] Figure 5 It is along Figure 4 A cross-sectional view of the head taken along line A-A'.

[0046] Figure 6 It is an exploded perspective view of a head portion of a skin care device according to an embodiment of the present invention.

[0047] Figure 7 1 is a first perspective view of an electrode unit in a skin care device according to an embodiment of the present invention.

[0048] Figure 8This is a second perspective view of the electrode unit in the skin care device according to one embodiment of the present invention.

[0049] Fig. 9 It is an exploded perspective view of an electrode unit in a skin care device according to an embodiment of the present invention.

[0050] Fig.10 This is a front view of a cover of a housing in a skin care device according to an embodiment of the present invention.

[0051] Fig.11 (a) and (b) are diagrams showing a comparison of the heat energy transfer to the dermis layer of the skin care device of the present invention and the skin care device of the comparative invention. DETAILED DESCRIPTION

[0052] The purpose, specific advantages and novel features of the present invention will become more apparent through the following detailed description and preferred embodiments associated with the accompanying drawings. In this specification, when adding symbols to the constituent elements of each figure, the same symbols are added as much as possible for the same constituent elements even if they are illustrated in different drawings. In addition, when describing the present invention, if it is determined that the specific description of the relevant known technology makes the gist of the present invention unclear, its detailed description is omitted.

[0053] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0054] Figure 1 is a three-dimensional diagram of a skin care device according to an embodiment of the present invention, Figure 2 is an exploded perspective view of a skin care device according to an embodiment of the present invention. Figure 3 This is a rear perspective view of the head of the skin care device according to one embodiment of the present invention.

[0055] Reference Figures 1 to 3 A skin care device 1 according to an embodiment of the present invention may include a main body 2 and a head 3 .

[0056] The main body 2 may have a shape that is easy for the user to hold with his hand, and may be connected to the head 3. The main body 2 may have a shape that extends in one direction. For example, the main body 2 may have a shape that extends in a vertical direction. The main body 2 may have a bar or stick shape that extends in one direction, such as a cylinder or a multifaceted prism. Thus, the user can control the position of the skin management device 1 by holding the main body 2 with his hand.

[0057] The main body 2 may include a front cover 21, a rear cover 22, and a groove 23. The main body 2 may have a storage space inside through the front cover 21 and the rear cover 22. Various components that enable the skin management device 1 to work, such as a battery 24, a charging interface 25, a switch 26, a function button 27, an indicator light 28, and a first terminal 29, may be arranged in the storage space of the main body 1.

[0058] The groove 23 may be disposed on one side of the upper portion of the front cover 21 of the main body 2. The groove 23 may be recessed from one side of the front cover 21 of the main body 2 toward the inside of the main body 2, and the head 3 may be configured in a detachable manner.

[0059] The battery 24 can supply power to the skin care device 1. For example, the battery 24 can supply power to the main body 2 and the head 3 connected to the main body 2, respectively. The battery 24 may include a battery selected from primary batteries such as manganese (Mn) batteries, alkaline (Alkaline) batteries, mercury batteries, silver oxide (silveroxide) batteries, etc. In addition, the battery 24 may include a battery selected from secondary batteries such as nickel-cadmium (Ni-Cd) batteries, nickel-metal hydride (Ni-MH) batteries, and lithium-ion (Li-ion) batteries.

[0060] In the case where the skin management device 1 includes a rechargeable battery 24, a cover for removing and installing the battery 24 may be provided on the back cover 22 of the main body 2. In contrast, in the case where the battery 24 is arranged inside the main body 2 and is difficult to remove and install, a charging interface 25 may be provided on the back cover 22 of the skin management device 1. The charging interface 25 is electrically connected to the battery 24 arranged inside the main body 2, and a portion may be exposed to the outside of the back cover 22 of the main body 2. The user can charge the battery 24 by connecting a USB interface, a cable, etc. for charging the battery 24 to the exposed charging interface 25. In contrast, the skin management device 1 may be provided in a manner that allows wireless charging. Specifically, the skin management device 1 may be provided in a manner that allows wireless charging by means of a coil or the like arranged in the main body 2. For example, the skin management device 1 may charge the battery 24 by means of a wireless charging method such as a magnetic resonance method or a magnetic induction method.

[0061] The switch 26 can be provided in a manner of protruding a portion of the front cover 21 of the main body 2. The setting position is not limited, and of course, it can be provided at any position that is convenient for the user to operate. The switch 26 can be a physical switch including an elastic body such as a spring. In addition, the switch 26 can be an electrical switch formed with a touch electrode or the like. The user can start / end the operation of the skin management device 1 through the switch 26.

[0062] The function button 27 can be provided in a manner of partially protruding outward from the front cover 21 of the main body 2. The setting position is not limited, and of course, it can be provided at any position that is convenient for the user to operate. The function button 27 can select the function of the skin management device 1. For example, the function button 27 can select the first RF mode, the first EMS mode, the RF+EMS mode, the light-emitting mode, and other functions.

[0063] The indicator light 28 may be provided in a manner that a portion is exposed to the outside of the front cover 21 of the main body 2. For example, the indicator light 28 may be arranged adjacent to the switch 26 and / or the function button 27, and may display the current state of the skin management device 1, such as the switch state or the functional state of the first RF mode, the first EMS mode, the light-emitting mode, or the like.

[0064] The first terminal 29 may be electrically connected to the battery 24. The first terminal 29 may be electrically connected to the second terminal 34 of the head 3 coupled through the groove 23.

[0065] The head 3 can be connected to the main body 2, and the head 3 can be physically connected to the main body 2. For example, the head 3 can have a shape corresponding to the groove 23 provided in the front cover 21 of the main body 2, and can be inserted into such a groove 23 at a predetermined depth for connection. The head 3 can be configured to be detachable from the main body 2.

[0066] In addition, the head 3 can be electrically connected to the main body 2. For example, the head 3 has a second terminal 34 on the lower surface, and can be electrically connected via the first terminal 29 provided in the internal storage space of the main body 2. Thus, the battery 24 disposed in the main body 2 can supply power to the head 3.

[0067] Below, refer to Figures 4 to 10 The head 3 will be described in detail.

[0068] Figure 4 is a front view of a head portion of a skin care device according to an embodiment of the present invention, Figure 5 It is along Figure 4 The cross-sectional view of the head cut along the line A-A', Figure 6 is an exploded perspective view of a head of a skin care device according to an embodiment of the present invention. Figure 7 is a first stereoscopic view of an electrode unit in a skin care device according to an embodiment of the present invention, Figure 8 is a second stereoscopic view of the electrode portion of the skin care device according to one embodiment of the present invention, Fig. 9 is an exploded perspective view of an electrode portion of a skin care device according to an embodiment of the present invention. Fig.10 This is a front view of a cover of a housing in a skin care device according to an embodiment of the present invention.

[0069] The head 3 may include a housing 31 , a substrate 32 , a light emitting element 33 , a second terminal 34 , and an electrode portion 35 .

[0070] The housing 31 may be composed of an edge 311 and a cover 312 covering the upper portion of the edge 311, whereby the lower portion is opened and a storage space is provided inside. The storage space of the housing 31 may store the substrate 32, the light emitting element 33, the second terminal 34, and the electrode portion 35. The edge 311 may be formed to a size that fixes the edge of the substrate 32 and the electrode portion 35.

[0071] The cover 312 may be disposed on the upper portion of the edge 311. The cover 312 may be a translucent or opaque cover, and may include a material that allows light emitted from the light emitting element 33 to pass through. In addition, the cover 312 may include a material that is lightweight and can prevent damage from external impact or contact. As an example, the cover 312 may include at least one material selected from resin, ceramic, metal, etc., and allows light emitted from the light emitting element 33 to pass through while improving reliability to the external environment.

[0072] The cover 312 has a structure that can be combined with and separated from the edge 311. However, the embodiment is not limited thereto, and the cover 312 and the edge 311 may be integrally formed.

[0073] As described above, the housing 31 composed of the edge 311 and the cover 312 may include a plurality of holes 313a, 313b, 313c, 313d, 313e, 313f, 313g so that a portion is exposed to the outside when the electrode unit 35 is stored. Considering that the plurality of holes 313a, 313b, 313c, 313d, 313e, 313f, 313g are structures related to the electrode unit 35, they will be described later together with the electrode unit 35.

[0074] A substrate 32 may be housed in the housing 31. A plurality of light emitting elements 33 may be disposed on the upper portion of the substrate 32, and a second terminal 34 electrically connected to the first terminal 29 of the main body 2 may be provided on the lower portion of the substrate 32.

[0075] The plurality of light emitting elements 33 may be electrically connected to the substrate 32. The plurality of light emitting elements 33 may be disposed on the upper surface of the substrate 32. The plurality of light emitting elements 33 may be disposed in an edge region of the substrate 32.

[0076] When the light-emitting mode is selected by the function button 27, the plurality of light-emitting elements 33 may emit light in the visible light band. Specifically, the plurality of light-emitting elements 33, as visible light-emitting elements, may emit light having a wavelength of about 400 nm or more. For example, the plurality of light-emitting elements 33 may emit light in at least one wavelength band of green light in the wavelength band of about 450 nm to about 580 nm, orange light in the wavelength band of about 590 nm to about 620 nm, and red light in the wavelength band of about 620 nm to about 750 nm.

[0077] In this embodiment, the light-emitting mode can be used alone or together with the first RF mode, the first EMS mode or the RF+EMS mode. The skin care device 1 of the present invention can activate the light-emitting mode together with the first RF mode, the first EMS mode or the RF+EMS mode.

[0078] The electrode portion 35 may be accommodated inside the housing 31. The electrode portion 35 may be disposed on the substrate 32. The electrode portion 35 may include a material that is harmless to the human body. Specifically, the electrode portion 35 may include a metal material that is conductive and does not deform due to contact pressure with the skin. As an example, the electrode portion 35 may include at least one metal selected from aluminum (Al), copper (Cu), zinc (Zn), iron (Fe), nickel (Ni), chromium (Cr), silver (Ag), gold (Au), platinum (Pt), stainless steel (SUS), and alloys thereof.

[0079] The electrode part 35 is electrically connected to the substrate 32 and can be in contact with the user's skin. The electrode part 35 can provide not only high-frequency / low-frequency current but also at least one of galvanic current and microcurrent to the user's skin.

[0080] The electrode portion 35 may include a plurality of electrodes 351a, 351b, 351c, and 351d. For example, the electrode portion 35 may include a first electrode 351a, a second electrode 351b, a third electrode 351c, and a fourth electrode 351d that are spaced apart from each other.

[0081] The first electrode 351a can be arranged in the center of the head 3, the second electrode 351b can surround the first electrode 351a and be arranged at equal intervals, the third electrode 351c can surround the second electrode 351b and be arranged at equal intervals, and the fourth electrode 351d can surround the third electrode 351c and be arranged at equal intervals.

[0082] The planar shape of the first electrode 351a can be formed into a half square shape, but is not limited thereto, and can of course be formed into various shapes such as a ring shape, various forms of donut shapes, etc. The first electrode 351a can be formed with a first width and a first height, and the cross-sectional shape can have a reversed U-shaped shape. Thus, the weight of the first electrode 351a can be reduced, and the total weight and manufacturing cost of the head 3 can be reduced.

[0083] The first electrode 351a may include a first contact portion 352a and a second contact portion 352b exposed to the outside of the head 3. The first contact portion 352a and the second contact portion 352b may be electrodes that come into contact with the skin of the user.

[0084] The first contact portion 352a and the second contact portion 352b may have shapes corresponding to each other. For example, the cross-sectional shapes of the first contact portion 352a and the second contact portion 352b may have a reversed U-shape.

[0085] The first contact portion 352a and the second contact portion 352b may be spaced apart from each other in the first direction (lateral direction) or symmetrical with respect to each other with respect to an imaginary line in the second direction (longitudinal direction).

[0086] The first contact portion 352a and the second contact portion 352b may include an upper surface that contacts the user's skin. The upper surface of each of the first contact portion 352a and the second contact portion 352b may be arranged above the upper surface of the cover 312 of the housing 31. Thus, the first contact portion 352a and the second contact portion 352b may contact the user's skin, and not only high-frequency / low-frequency currents but also at least one of galvanic currents and microcurrents may be provided to the skin.

[0087] The first electrode 351a may further include a first connection portion 353a and a second connection portion 353b. The first connection portion 353a and the second connection portion 353b may be disposed at two ends of the first contact portion 352a and the second contact portion 352b, respectively, to connect the first contact portion 352a and the second contact portion 352b.

[0088] The first connection portion 353a and the second connection portion 353b may have shapes corresponding to each other. As an example, the first connection portion 353a and the second connection portion 353b may be spaced apart from each other in the second direction (longitudinal direction). In addition, the first connection portion 353a and the second connection portion 353b may be symmetrical with respect to an imaginary line in the first direction (lateral direction).

[0089] The first connection portion 353a and the second connection portion 353b may not be exposed outside the head portion 3. For example, the first connection portion 353a and the second connection portion 353b may be bent and extended toward the substrate 32 at both ends of the first contact portion 352a and the second contact portion 352b.

[0090] The first connection portion 353a and the second connection portion 353b may have a lower height than the first contact portion 352a and the second contact portion 352b. The upper surface of each of the first connection portion 353a and the second connection portion 353b may be arranged below the upper surface of the cover 312. The first connection portion 353a and the second connection portion 353b may be formed in a shape in which both ends of each of the first contact portion 352a and the second contact portion 352b are recessed.

[0091] Such first connection part 353a and second connection part 353b can provide a movement channel for cosmetics (dosage form), and when used, the cosmetics can be evenly spread along the first connection part 353a and the second connection part 353b toward the first electrode 351a.

[0092] In addition, the embodiment may include a first contact portion 354a connecting the first electrode 351a and the substrate 32. The first contact portion 354a may extend toward the substrate 32 in at least one structure of the first contact portion 352a, the second contact portion 352b, the first connection portion 353a, and the second connection portion 353b, and may apply a set current to the first electrode 351a.

[0093] The second electrode 351b may have a shape corresponding to the first electrode 351a. For example, the planar shape of the second electrode 351b may be formed into a half square shape, but is not limited thereto, and may also be formed into various shapes such as a ring shape, a donut shape of various shapes, etc. The second electrode 351b may be formed with a second width and a second height, and the cross-sectional shape may have a reversed U-shaped shape. Thus, the weight of the second electrode 351b may be reduced, and the total weight and manufacturing cost of the head 3 may be reduced.

[0094] The second electrode 351b may include a third contact portion 352c and a fourth contact portion 352d exposed to the outside of the head 3. The third contact portion 352c and the fourth contact portion 352d may be electrodes that come into contact with the user's skin.

[0095] The third contact portion 352c and the fourth contact portion 352d may have shapes corresponding to each other. As an example, the cross-sectional shape of the third contact portion 352c and the fourth contact portion 352d may have a reversed U-shape.

[0096] The third contact portion 352c and the fourth contact portion 352d may be spaced apart from each other in the first direction (lateral direction) or symmetrical with each other with respect to an imaginary line in the second direction (longitudinal direction).

[0097] The third contact portion 352c and the fourth contact portion 352d may include an upper surface that contacts the user's skin. The upper surface of each of the third contact portion 352c and the fourth contact portion 352d may be arranged above the upper surface of the cover 312 of the housing 31. Thus, the third contact portion 352c and the fourth contact portion 352d may contact the user's skin, and not only high-frequency / low-frequency current but also at least one of galvanic current and microcurrent may be provided to the skin.

[0098] The second electrode 351b may further include a third connection portion 353c and a fourth connection portion 353d. The third connection portion 353c and the fourth connection portion 353d may be respectively disposed at two ends of the third contact portion 352c and the fourth contact portion 352d to connect the third contact portion 352c and the fourth contact portion 352d.

[0099] The third connection portion 353c and the fourth connection portion 353d may have shapes corresponding to each other. As an example, the third connection portion 353c and the fourth connection portion 353d may be spaced apart from each other in the second direction (longitudinal direction). In addition, the third connection portion 353c and the fourth connection portion 353d may be symmetrical with respect to an imaginary line in the first direction (lateral direction).

[0100] The third connection portion 353c and the fourth connection portion 353d may not be exposed outside the head portion 3. For example, the third connection portion 353c and the fourth connection portion 353d may be bent and extended toward the substrate 32 at both ends of the third contact portion 352c and the fourth contact portion 352d.

[0101] The third connection portion 353c and the fourth connection portion 353d may have a lower height than the third contact portion 352c and the fourth contact portion 352d. The upper surface of each of the third connection portion 353c and the fourth connection portion 353d may be arranged at a position lower than the upper surface of the cover 312. The third connection portion 353c and the fourth connection portion 353d may be formed in a form in which both ends of each of the third contact portion 352c and the fourth contact portion 352d are recessed.

[0102] Such third connection part 353c and fourth connection part 353d can provide a movement channel for cosmetics (dosage form), and when used, the cosmetics can be evenly spread along the third connection part 353c and the fourth connection part 353d toward the second electrode 351b.

[0103] In addition, the embodiment may further include a second contact portion 354b connecting the second electrode 351b and the substrate 32. The second contact portion 354b may extend toward the substrate 32 on at least one of the third contact portion 352c, the fourth contact portion 352d, the third connection portion 353c, and the fourth connection portion 353d, and may apply a set current to the second electrode 351b.

[0104] The third electrode 351c may have a shape corresponding to the second electrode 351b. For example, the planar shape of the third electrode 351c may be formed into a half square shape, but is not limited thereto, and may also be formed into various shapes such as a ring shape, a donut shape of various shapes, etc. The third electrode 351c may be formed with a third width and a third height, and the cross-sectional shape may have a reversed U-shaped shape. Thus, the weight of the third electrode 351c may be reduced, and the total weight and manufacturing cost of the head 3 may be reduced.

[0105] The third electrode 351c may include a fifth contact portion 352e and a sixth contact portion 352f exposed to the outside of the head 3. The fifth contact portion 352e and the sixth contact portion 352f may be electrodes that come into contact with the skin of the user.

[0106] The fifth contact portion 352e and the sixth contact portion 352f may have shapes corresponding to each other. For example, the cross-sectional shapes of the fifth contact portion 352e and the sixth contact portion 352f may have a reversed U-shape.

[0107] The fifth contact portion 352e and the sixth contact portion 352f may be spaced apart from each other in the first direction (lateral direction) and may be symmetrical with respect to each other with respect to an imaginary line in the second direction (longitudinal direction).

[0108] The fifth contact portion 352e and the sixth contact portion 352f may include an upper surface that contacts the user's skin. The upper surface of each of the fifth contact portion 352e and the sixth contact portion 352f may be disposed at a position higher than the upper surface of the cover 312 of the housing 31. Thus, the fifth contact portion 352e and the sixth contact portion 352f may contact the user's skin, and may provide not only high-frequency / low-frequency current but also at least one of galvanic current and microcurrent to the skin.

[0109] The third electrode 351c may further include a fifth connection portion 353e and a sixth connection portion 353f. The fifth connection portion 353e and the sixth connection portion 353f may be disposed at two ends of the fifth contact portion 352e and the sixth contact portion 352f, respectively, to connect the fifth contact portion 352e and the sixth contact portion 352f.

[0110] The fifth connection portion 353e and the sixth connection portion 353f may have shapes corresponding to each other. As an example, the fifth connection portion 353e and the sixth connection portion 353f may be spaced apart from each other in the second direction (longitudinal direction). In addition, the fifth connection portion 353e and the sixth connection portion 353f may be symmetrical with respect to an imaginary line in the first direction (lateral direction).

[0111] The fifth connection portion 353e and the sixth connection portion 353f may not be exposed outside the head portion 3. For example, the fifth connection portion 353e and the sixth connection portion 353f may be bent and extended toward the substrate 32 at both ends of the fifth contact portion 352e and the sixth contact portion 352f.

[0112] The fifth connection portion 353e and the sixth connection portion 353f may have a height lower than the fifth contact portion 352e and the sixth contact portion 352f. The upper surface of each of the fifth connection portion 353e and the sixth connection portion 353f may be arranged at a position lower than the upper surface of the cover 312. The fifth connection portion 353e and the sixth connection portion 353f may be formed in a form in which both ends of each of the fifth contact portion 352e and the sixth contact portion 352f are recessed.

[0113] Such fifth connection part 353e and sixth connection part 353f can provide a movement channel for cosmetics (dosage form), so that the cosmetics can be evenly spread along the fifth connection part 353e and the sixth connection part 353f toward the third electrode 351c during use.

[0114] In addition, the embodiment may include a third contact portion 354c connecting the third electrode 351c and the substrate 32. The third contact portion 354c may extend toward the substrate 32 in at least one of the fifth contact portion 352e, the sixth contact portion 352f, the fifth connection portion 353e, and the sixth connection portion 353f, and may apply a set current to the third electrode 351c.

[0115] The fourth electrode 351d may have a shape corresponding to the third electrode 351c. For example, the plane shape of the fourth electrode 351d may be formed into a half square shape, but is not limited thereto, and may also be formed into various shapes such as a ring shape, a donut shape of various shapes, etc. The fourth electrode 351d may be formed with a fourth width and a fourth height, and the cross-sectional shape may have a reversed U-shaped shape. Thus, the weight of the fourth electrode 351d may be reduced, and the total weight and manufacturing cost of the head 3 may be reduced.

[0116] In this embodiment, the fourth electrode 351d is different from the first electrode 351a, the second electrode 351b, and the third electrode 351c in that the connection portions 353a, 353b, 353c, 353d, 353e, and 353f are omitted and a common seventh contact portion 352g is included.

[0117] The fourth electrode 351d may include a seventh contact portion 352g exposed to the outside of the head 3. The seventh contact portion 352g may be an electrode that contacts the skin of the user.

[0118] The cross-sectional shape of the seventh contact portion 352g may have a reversed U-shape.

[0119] The seventh contact portion 352g may include an upper surface that contacts the user's skin. The upper surface of the seventh contact portion 352g may be disposed at a position higher than the upper surface of the cover 312 of the housing 31. Thus, the seventh contact portion 352g may contact the user's skin, and may provide not only high-frequency / low-frequency current but also at least one of galvanic current and microcurrent to the skin.

[0120] In this way, the fourth electrode 351d of this embodiment is different from the first electrode 351a, the second electrode 351b, and the third electrode 351c mentioned above, and does not form connecting parts 353a, 353b, 353c, 353d, 353e, and 353f that provide a movement channel for cosmetics, so that the cosmetics are evenly spread only on the inner side of the head 3 when used.

[0121] In addition, the embodiment may include a fourth contact portion 354e connecting the fourth electrode 351d and the substrate 32. At least one fourth contact portion 354e may extend toward the substrate 32 at the seventh contact portion 352g and may apply a set current to the fourth electrode 351d.

[0122] In the present embodiment, the first width of the first electrode 351 a , the second width of the second electrode 351 b , the third width of the third electrode 351 c , and the fourth width of the fourth electrode 351 d may be the same or similar, respectively.

[0123] However, in this embodiment, the first height of the first electrode 351a, the second height of the second electrode 351b, the third height of the third electrode 351c and the fourth height of the fourth electrode 351d may be the same or similar, but are preferably formed into different heights for the following reasons.

[0124] For example, with the horizontal plane as a reference, the first height of the first electrode 351 a disposed at the center of the head 3 may be the highest, and the fourth height of the fourth electrode 351 d disposed at the outermost portion of the head 3 may be the lowest.

[0125] For example, the height difference between adjacent electrodes in the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d may be in the range of 5% to 25%. Preferably, the height difference between adjacent electrodes in the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d may be in the range of 5% to 20%. More preferably, the height difference between adjacent electrodes in the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d may be in the range of 5% to 15%.

[0126] When the height difference between adjacent electrodes among the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d exceeds about 25% or is less than about 5%, the contact characteristics between the user's skin and the contact parts 352a, 352b, 352c, 352d, 352e, 352f, and 352g may be reduced. For example, the skin area of ​​the user is divided into a flat skin area and a curved skin area such as the cheeks, chin, and both corners of the eyes. When the height difference between the adjacent electrodes of the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d exceeds about 25%, the contact characteristics of the contact parts 352a, 352b, 352c, 352d, 352e, 352f, and 352g in the flat skin area are reduced, and when it is less than about 5%, the contact characteristics of the contact parts 352a, 352b, 352c, 352d, 352e, 352f, and 352g in the curved skin area are reduced. In addition, when the height difference between the adjacent electrodes of the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d exceeds about 25%, the cosmetics or drugs placed between the head 3 and the user's skin move to the edge area of ​​the head 3 or to the center area of ​​the head 3.

[0127] As described above, the housing 31 composed of the edge 311 and the cover 312 may include a plurality of holes 313 a , 313 b , 313 c , 313 d , 313 e , 313 f , and 313 g to partially expose the electrode unit 35 to the outside when the electrode unit 35 is housed.

[0128] The cover 312 may include: a first hole 313a and a second hole 313b, which are formed in areas corresponding to the first contact portion 352a and the second contact portion 352b of the first electrode 351a, respectively; a third hole 313c and a fourth hole 313d, which are formed in areas corresponding to the third contact portion 352c and the fourth contact portion 352d of the second electrode 351b, respectively; a fifth hole 313e and a sixth hole 313f, which are formed in areas corresponding to the fifth contact portion 352e and the sixth contact portion 352f of the third electrode 351c, respectively; and a seventh hole 313g, which is formed in an area corresponding to the seventh contact portion 352g of the fourth electrode 351d.

[0129] Specifically, the first hole 313a and the second hole 313b are respectively arranged in the region overlapping with the first contact portion 352a and the second contact portion 352b in the vertical direction, and may have shapes corresponding to the first contact portion 352a and the second contact portion 352b. A portion of the first electrode 351a, such as a portion of the first contact portion 352a, may be inserted into the first hole 313a and arranged, and a portion of the first electrode 351a, such as a portion of the second contact portion 352b, may be inserted into the second hole 313b and arranged.

[0130] At this time, a portion of the first contact portion 352a and the second contact portion 352b are disposed at the lower portion of the cover 312, and the remaining portion of the first contact portion 352a and the second contact portion 352b may protrude from the upper surface of the cover 312 to contact the user's skin.

[0131] In addition, the third hole 313c and the fourth hole 313d are respectively arranged in the region overlapping with the third contact portion 352c and the fourth contact portion 352d in the vertical direction, and may have shapes corresponding to the third contact portion 352c and the fourth contact portion 352d. A portion of the second electrode 351b, such as a portion of the third contact portion 352c, may be inserted into the third hole 313c and arranged, and a portion of the second electrode 351b, such as a portion of the fourth contact portion 352d, may be inserted into the fourth hole 313d and arranged.

[0132] At this time, a portion of the third contact portion 352c and the fourth contact portion 352d may be disposed at the bottom of the cover 312, and the remaining portion of the third contact portion 352c and the fourth contact portion 352d may protrude from the upper surface of the cover 312 to contact the user's skin.

[0133] In addition, the fifth hole 313e and the sixth hole 313f are respectively arranged in the area overlapping with the fifth contact portion 352e and the sixth contact portion 352f in the vertical direction, and can have shapes corresponding to the fifth contact portion 352e and the sixth contact portion 352f. A part of the third electrode 351c, such as a part of the fifth contact portion 352e, can be inserted into the fifth hole 313e and arranged, and a part of the third electrode 351c, such as a part of the sixth contact portion 352f, can be inserted into the sixth hole 313f and arranged.

[0134] At this time, a portion of the fifth contact portion 352e and the sixth contact portion 352f may be disposed at the bottom of the cover 312, and the remaining portion of the fifth contact portion 352e and the sixth contact portion 352f may protrude from the upper surface of the cover 312 to contact the user's skin.

[0135] The seventh hole 313g is disposed in a region vertically overlapping the seventh contact portion 352g and may have a shape corresponding to the seventh contact portion 352g. A portion of the fourth electrode 351d, for example, a portion of the seventh contact portion 352g may be inserted into the seventh hole 313g.

[0136] At this time, a portion of the seventh contact portion 352g may be disposed at the lower portion of the cover 312, and the remaining portion of the seventh contact portion 352g may protrude from the upper surface of the cover 312 to contact the user's skin.

[0137] The skin care device 1 of this embodiment constructed as described above can form a first connection part 353a, a second connection part 353b, a third connection part 353c, a fourth connection part 353d, a fifth connection part 353e, and a sixth connection part 353f on the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d arranged on the inner side of the head 3 as a cosmetic movement channel, so that when used, the cosmetics are evenly dispersed to all the electrodes 351a, 351b, 351c, and 351d along the movement channel, and no connection part is formed on the fourth electrode 351d arranged on the outermost periphery of the head 3 as a movement channel, so that when used, the cosmetics are evenly dispersed only on the inner side of the head.

[0138] Furthermore, the skin management device 1 of this embodiment alternately applies different frequencies to the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d at a set period, so that in the first RF mode, high-frequency heat energy can be evenly transferred from the upper dermis to the lower dermis. In the EMS (Electrical Muscle Stimulation) mode, muscle pain can be eliminated through the low-frequency massage function and muscles can be activated.

[0139] The skin care device 1 of the present invention can apply a current of a selected frequency to at least two electrodes selected from the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d so that it can work in an acceleration mode, a first RF mode, a first EMS mode, and an RF+EMS mode. This will be described with reference to Table 1 below. Here, the acceleration mode may be included in the first RF mode. In this embodiment, the term "acceleration" is a concept of quickly raising the temperature of the skin to a specified level while using the skin care device. Under such a concept, the acceleration mode refers to an acceleration (increase) interval in which a current of a frequency (the first frequency described later; 2.2Mhz) that can heat the skin most quickly is applied at a duty cycle of 100% for a specified time period before performing frequency alternation as a basic action, in order to quickly eliminate the cold feeling felt when the skin is in contact with the metal and cosmetics at the beginning of use and provide a quick warm feeling to the user's skin and transfer heat to the deep part.

[0140]

Table 1

[0141]

[0142] High frequency penetrates into the skin to different depths depending on the wavelength. In this regard, the skin management device 1 of this embodiment sets the frequencies to be used in the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d to four within the range of 1MHz to 3MHz (high frequency) so as to cover deep heat from the upper dermis to the lower dermis in the first RF mode. The four frequencies can be set to the first frequency, the second frequency, the third frequency, and the fourth frequency in order from long to short. For example, the first frequency can be set to 2.2Mhz, the second frequency can be set to 1.8MHz, the third frequency can be set to 1.4MHz, and the fourth frequency can be set to 1.0MHz, but are not limited to this.

[0143] Such first, second, third and fourth frequencies may be selectively used in the acceleration mode for rapid temperature rise and the first RF mode for massaging the head 3 .

[0144] In the accelerated mode, the skin temperature is quickly raised to a prescribed level while the device is in use, thereby increasing the speed at which deep heat is felt.

[0145] The user can start the acceleration mode by selecting one of the acceleration levels 1, 2, and 3 through the function button 27. The acceleration levels 1, 2, and 3 can be set in the order of acceleration time from short to long. For example, the acceleration level 1 can be set to 5 seconds, the acceleration level 2 can be set to 10 seconds, and the acceleration level 3 can be set to 15 seconds.

[0146] In the acceleration mode, current may be supplied to the third electrode 351c and the fourth electrode 351d disposed outside the electrode portion 35 among the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d to accelerate the head 3. At this time, a current of the first frequency of 2.2 MHz with the largest frequency is supplied to the third electrode 351c and the fourth electrode 351d at a duty ratio of 100% to reflect a rapid temperature rise rate relative to the target.

[0147] In the above, a negative current is applied to one of the third electrode 351c and the fourth electrode 351d to which a current of the first frequency 2.2Mhz is applied, and a positive current is applied to the other electrode. For example, a negative current is applied to the third electrode 351c, and a positive current is applied to the fourth electrode 351d.

[0148] The first RF mode is automatically executed for a predetermined time period from the time point when the acceleration mode ends, and the first RF mode is automatically interrupted when the predetermined time has elapsed.

[0149] In the first RF mode, the first RF mode can be performed by dividing it into step 1 and step 2 as follows: any two frequency currents of the first frequency, the second frequency, the third frequency, and the fourth frequency are alternately applied to any two electrodes among the four electrodes of the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d at a set period, and no current is supplied to the other two electrodes.

[0150] For example, in step 1, currents of the second frequency of 1.8 MHz and the fourth frequency of 1.0 MHz may be applied alternately to the first electrode 351a and the second electrode 351b, respectively, with a period of less than 1 second, and currents of the first frequency of 2.2 MHz and the third frequency of 1.4 MHz may be applied alternately to the third electrode 351c and the fourth electrode 351d, respectively, with a period of less than 1 second in step 2. The alternating period may be 1 to 999 ms (milliseconds).

[0151] In the first RF mode, when step 1 is executed, step 2 is not executed, and conversely, when step 2 is executed, step 1 is not executed. Step 1 and step 2 can be executed alternately during a set time period, and when the set time is reached, the first RF mode is automatically terminated. The execution process of step 1 and step 2 is specifically described below.

[0152] In step 1, a current of the second frequency of 1.8 MHz and a current of the fourth frequency of 1.0 MHz may be alternately supplied to the first electrode 351 a and the second electrode 351 b several to several tens of times, respectively, during a first set time.

[0153] In the above, a negative current may be applied to one of the first electrode 351a and the second electrode 351b to which the current of the second frequency and the current of the fourth frequency are applied, and a positive current may be applied to the other electrode. For example, a negative current may be applied to the first electrode 351a, and a positive current may be applied to the second electrode 351b.

[0154] In step 2, a current of a first frequency of 2.2 MHz and a current of a third frequency of 1.4 MHz may be alternately supplied to the third electrode 351 c and the fourth electrode 351 d several to several tens of times, respectively, during a first set time.

[0155] In the above, a negative current may be applied to one of the third electrode 351c and the fourth electrode 351d to which the current of the first frequency and the third frequency is applied, and a positive current may be applied to the other electrode. For example, a negative current may be applied to the third electrode 351c, and a positive current may be applied to the fourth electrode 351d.

[0156] Between the above-mentioned step 1 and step 2, a current of a frequency of 0 MHz is supplied to each of the first electrode 351 a , the second electrode 351 b , the third electrode 351 c , and the fourth electrode 351 d during the second set time (to be in a current-off state).

[0157] In the above description, in the acceleration mode, the first set time and the second set time may be different according to the selected acceleration level.

[0158] For example, in the acceleration mode, when the acceleration level 1 of supplying the current of the first frequency (2.2Mhz) for 5s (seconds) to the third electrode 351c and the fourth electrode 351d is selected, the first set time for executing step 1 or step 2 can be set to 30ms (milliseconds), and the second set time for not executing step 1 and step 2 can be set to 20ms to maintain the acceleration temperature corresponding to the acceleration level 1.

[0159] At this time, a current of a second frequency (1.8 MHz) and a current of a fourth frequency (1.0 MHz) applied to the first electrode 351a and the second electrode 351b, respectively, and a current of a first frequency (2.2 MHz) and a current of a third frequency (1.4 MHz) applied to the third electrode 351c and the fourth electrode 351d, respectively, may be supplied at a duty cycle of 60% to maintain an acceleration temperature corresponding to acceleration level 1, but is not limited thereto.

[0160] In addition, in the acceleration mode, when the acceleration level 2 is selected to supply the third electrode 351c and the fourth electrode 351d with a current of the first frequency (2.2Mhz) for 10 seconds, the first set time for executing step 1 or step 2 can be set to 40ms (milliseconds), and the second set time for not executing step 1 and step 2 can be set to 10ms to maintain the acceleration temperature corresponding to the acceleration level 2.

[0161] At this time, the current of the second frequency (1.8MHz) and the current of the fourth frequency (1.0MHz) applied to the first electrode 351a and the second electrode 351b, respectively, and the current of the first frequency (2.2MHz) and the current of the third frequency (1.4MHz) applied to the third electrode 351c and the fourth electrode 351d, respectively, can be supplied with an 80% duty cycle to maintain the acceleration temperature corresponding to the acceleration level 2, but is not limited to this.

[0162] In addition, in the acceleration mode, when the acceleration level 3 is selected to supply the current of the first frequency (2.2Mhz) for 15s (seconds) to the third electrode 351c and the fourth electrode 351d, the first set time for executing step 1 or step 2 can be set to 45ms (milliseconds), and the second set time for not executing step 1 and step 2 can be set to 5ms to maintain the acceleration temperature corresponding to the acceleration level 3.

[0163] At this time, a current of the second frequency (1.8 MHz) and a current of the fourth frequency (1.0 MHz) applied to the first electrode 351a and the second electrode 351b, respectively, and a current of the first frequency (2.2 MHz) and a current of the third frequency (1.4 MHz) applied to the third electrode 351c and the fourth electrode 351d, respectively, can be provided at a duty cycle of 90% to maintain an acceleration temperature corresponding to acceleration level 3, but is not limited thereto.

[0164] As described above, in the first RF mode of the skin management device 1, any one of the acceleration levels 1, 2, and 3 can be selected, and the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d of step 1 performed in the first RF mode after the acceleration mode can be repeatedly performed in a prescribed order. The first RF mode can be repeatedly performed for a prescribed time in the order of step 1->step 2->step 1->step 2. At this time, for the safety of the user, the total execution time of the first RF mode can be set to about 5 minutes, but is not limited thereto.

[0165] The skin management device 1 of this embodiment can set the frequency to be used in the four electrodes, namely, the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d, to at least one fifth frequency, for example, setting at least one fifth frequency within the range below 150 Hz (low frequency) and setting different execution times to execute the first EMS mode to eliminate muscle pain and activate muscles.

[0166] The first EMS mode can be automatically executed during a prescribed time period from the time point when the acceleration mode is terminated, and the first EMS mode can be automatically interrupted when the prescribed time has passed. In addition, the first EMS mode can of course be executed independently of the acceleration mode.

[0167] The first EMS mode can be performed by distinguishing steps 3, 4, and 5 as follows: when a current of the fifth frequency is applied to any two of the four electrodes, the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d, at a set period, no current is supplied to the other two electrodes. Regarding the skin management device 1 of this embodiment, the fifth frequency is set to 50 Hz, but it is not limited to this.

[0168] For example, in step 3 of the first EMS mode, a current of the fifth frequency (50 Hz) may be applied to the third electrode 351c and the fourth electrode 351d, respectively, and no current is applied to the first electrode 351a and the second electrode 351b. In step 4 of the first EMS mode, a current of the fifth frequency (50 Hz) may be applied to the first electrode 351a and the fourth electrode 351d, respectively, and no current is applied to the second electrode 351b and the third electrode 351c. In step 5 of the first EMS mode, a current of the fifth frequency (50 Hz) may be applied to the first electrode 351a and the second electrode 351b, respectively, and no current is applied to the third electrode 351c and the fourth electrode 351d.

[0169] The fifth frequencies respectively applied in step 3, step 4, and step 5 of the first EMS mode may be the same, but are not limited thereto.

[0170] The first EMS mode described above can be executed by setting the stimulation time to different times in step 3, step 4, and step 5 of applying the fifth frequency. The user can start the first EMS mode by selecting any one of stimulation level 1, stimulation level 2, and stimulation level 3 through the function button 27. Stimulation level 1, stimulation level 2, and stimulation level 3 are distinguished according to the stimulation time, and the stimulation time of stimulation level 1 is the shortest, and the stimulation time of stimulation level 3 is the longest. For example, stimulation level 1 can be set to 10us (microseconds), stimulation level 2 can be set to 12us (microseconds), and stimulation level 3 can be set to 14us (microseconds), but it is not limited thereto.

[0171] In addition, in the first EMS mode, between steps 3, 4, and 5, a current of 0 Hz frequency is supplied to the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d for a specified time, for example, 20 ms (milliseconds) (to become a current-off state).

[0172] A negative current may be applied to one of the third electrode 351c and the fourth electrode 351d, the first electrode 351a and the fourth electrode 351d, or the first electrode 351a and the second electrode 351b to which the current of the fifth frequency is applied, and a positive current may be applied to the other electrode. For example, a negative current may be applied to the former of the two electrodes, and a positive current may be applied to the latter.

[0173] In the first EMS mode, when step 3 is executed, step 4 and step 5 are not executed, when step 4 is executed, step 3 and step 5 are not executed, and when step 5 is executed, step 3 and step 4 are not executed.

[0174] As described above, in the first EMS mode of the skin management device 1, any one of the stimulation levels 1, 2, and 3 can be selected, and the third electrode 351c, the fourth electrode 351d, the first electrode 351a, the fourth electrode 351d, the first electrode 351a, and the second electrode 351b of step 3 performed in the first EMS mode, the first electrode 351a, and the second electrode 351b of step 5 can be repeatedly performed in a prescribed order. The first EMS mode of the skin management device 1 can be repeatedly performed for a prescribed time in the order of step 3->step 4->step 5->step 4->step 3->step 4->step 5->step 4. At this time, for the safety of the user, the total execution time of the first EMS mode can be set to about 5 minutes, but is not limited thereto.

[0175] The RF+EMS mode of the skin care device 1 may be a mode in which the second RF mode and the second EMS mode are combined and executed. The RF+EMS mode may be implemented by executing the second RF mode and the second EMS mode simultaneously or by adding the second EMS mode during the execution of the second RF mode or by adding the second RF mode during the execution of the second EMS mode.

[0176] Regarding the RF+EMS mode of the skin management device 1 of the present embodiment, it can be executed by executing the second RF mode in any two electrodes of the first electrode 351a, the second electrode 351b, the third electrode 351c, and the fourth electrode 351d, and executing the second EMS mode in the other two electrodes, which are divided into steps 6, 7, and 8.

[0177] In step 6 of the RF+EMS mode, the first electrode 351 a and the second electrode 351 b may perform a second RF mode, and the third electrode 351 c and the fourth electrode 351 d may perform a second EMS mode.

[0178] Currents of the first frequency of 2.2 MHz and the second frequency of 1.8 MHz may be applied to the first electrode 351 a and the second electrode 351 b performing the second RF mode at a period of less than 1 second, respectively.

[0179] The third electrode 351c and the fourth electrode 351d performing the second EMS mode may apply a current of the fifth frequency (50 Hz) during a time period of 10 us (microseconds), 12 us (microseconds) or 14 us (microseconds) as stimulation level 1, stimulation level 2 or stimulation level 3 is selected respectively.

[0180] In step 6 of the above-mentioned RF+EMS mode, the second RF mode is different from step 1 of the above-mentioned first RF mode only in that the frequency applied to the first electrode 351a and the second electrode 351b is different, and the remaining conditions are the same or similar. Therefore, in order to avoid repetition, the detailed description is omitted here.

[0181] In addition, in step 6 of the RF+EMS mode, the second EMS mode is compared with step 3 of the first EMS mode mentioned above, not only the electrodes executed are the same, but also the conditions may be the same or similar, so in order to avoid repetition, the detailed description is omitted here.

[0182] In step 7 of the RF+EMS mode, the second electrode 351 b and the third electrode 351 c perform the second RF mode, and the first electrode 351 a and the fourth electrode 351 d perform the second EMS mode.

[0183] Currents of the second frequency 1.8 MHz and the third frequency 1.4 MHz may be alternately applied to the second electrode 351 b and the third electrode 351 c performing the second RF mode, respectively, at a cycle of less than 1 second.

[0184] The first electrode 351a and the fourth electrode 351d performing the second EMS mode may apply a current of the fifth frequency (50 Hz) during a time period of 10 us (microseconds), 12 us (microseconds) or 14 us (microseconds) as stimulation level 1, stimulation level 2 or stimulation level 3 is selected, respectively.

[0185] In step 7 of the above-mentioned RF+EMS mode, the second RF mode is different from step 1 of the above-mentioned first RF mode in that only the frequency applied to the second electrode 351b is different, and the remaining conditions may be the same or similar. Compared with step 2 of the above-mentioned first RF mode, only the frequency applied to the third electrode 351c is different, and the remaining conditions may be the same or similar. Therefore, in order to avoid repetitive description, the detailed description is omitted here.

[0186] In addition, in step 7 of the RF+EMS mode, the second EMS mode is compared with step 4 of the first EMS mode mentioned above, not only the electrodes executed are the same, but also the conditions may be the same or similar, so in order to avoid duplication, the detailed description is omitted here.

[0187] In step 8 of the RF+EMS mode, the third electrode 351 c and the fourth electrode 351 d perform the second RF mode, and the first electrode 351 a and the second electrode 351 b may perform the second EMS mode.

[0188] Currents of the third frequency 1.4 MHz and the fourth frequency 1.0 MHz may be alternately applied to the third electrode 351 c and the fourth electrode 351 d performing the second RF mode, respectively, at a cycle of less than 1 second.

[0189] The first electrode 351a and the second electrode 351b performing the second EMS mode may apply a current of the fifth frequency (50 Hz) for a period of 10 us (microseconds), 12 us (microseconds) or 14 us (microseconds) depending on the selection of stimulation level 1, stimulation level 2 or stimulation level 3, respectively.

[0190] In step 8 of the above-mentioned RF+EMS mode, the second RF mode is different from step 2 of the above-mentioned first RF mode only in that the frequency applied to the third electrode 351c and the fourth electrode 351d is different, and the remaining conditions may be the same or similar. Therefore, in order to avoid repeated description, the detailed description is omitted here.

[0191] In addition, in step 8 of the RF+EMS mode, the second EMS mode is compared with step 5 of the first EMS mode mentioned above, not only the electrodes executed are the same, but also the conditions may be the same or similar, so in order to avoid repetition, the detailed description is omitted here.

[0192] As described above, in the RF+EMS mode of the skin care device 1, the second RF mode of step 6, step 7, and step 8 can be executed corresponding to step 1 and step 2 of the first RF mode. In the RF+EMS mode of the skin care device 1, the second EMS mode of step 6, step 7, and step 8 can be executed corresponding to step 3, step 4, and step 5 of the first EMS mode.

[0193] In the RF+EMS mode of the skin care device 1, the execution process of the above-mentioned steps 1 and 2 of the first RF mode and the execution process of the above-mentioned steps 3, 4, and 5 of the first EMS mode can be combined and executed in steps 6, 7, and 8. However, the execution order may be different.

[0194] That is, in the RF+EMS mode, any one of the acceleration levels 1, 2, and 3 can be selected in the RF mode, and after the acceleration mode, the first electrode 351a, the second electrode 351b, the second electrode 351b, the third electrode 351c, the third electrode 351c, and the fourth electrode 351d of step 6 performed in the second RF mode can be repeatedly performed in a prescribed order. In the RF+EMS mode, the second RF mode can be repeatedly performed in the order of step 6->step 7->step 8->step 7->step 6->step 7->step 8->step 7 for a prescribed time.

[0195] In addition, in the RF+EMS mode, the third electrode 351c and the fourth electrode 351d of step 6, the first electrode 351a and the fourth electrode 351d of step 7, and the first electrode 351a and the second electrode 351b of step 8 performed in the second EMS mode can be repeatedly performed in a prescribed order. In the RF+EMS mode, the second EMS mode can be performed by repeating the order of step 6->step 7->step 8->step 7->step 6->step 7->step 8->step 7 for a prescribed time.

[0196] The results of experiments conducted on a human body using the RF mode of the skin management device 1 of this embodiment are as follows.

[0197] 1. Skin wrinkle analysis

[0198] ① Wrinkles at the corners of the eyes; compared with before using the product, the parameters of overall size, depth and maximum depth showed significant reduction just after using the product and 4 weeks after use (p<0.05), with a reduction rate of 8.87% to 14.52%.

[0199] ② Nasal folds; compared with those before using the product, the parameters of overall size (Overall size), depth (Depth) immediately after using the product and 4 weeks after using the product, and the parameter of width (Width) 4 weeks after using the product showed significant reduction (p<0.05), with a reduction rate of 3.43% to 10.08%.

[0200] ③ Forehead wrinkles: Compared with before using the product, the parameters of overall size and depth showed significant reduction (p<0.05) just after using the product and after using the 4-axis, with a reduction rate of 2.14% to 10.08%.

[0201] ④ Glabellar wrinkles: Compared with before using the product, the parameters of overall size, depth and maximum depth immediately after using the product and 4 weeks after using the product, as well as the parameter of width 4 weeks after using the product showed significant reduction (p<0.05), with a reduction rate of 1.85% to 11.78%.

[0202] 2. Skin pore analysis

[0203] Compared with before using the product, volume, count and density parameters showed significant reduction (p<0.05) at 2 and 4 weeks after using the product, with a reduction rate of 6.79% to 14.66%.

[0204] 3. Skin brightness analysis

[0205] Compared with before using the product, the hyperconcentration parameters of the pigmentation site showed significant reductions after 2 and 4 weeks of using the product, and the affected area parameters after 4 weeks of using the product (p<0.05). The reduction rates of the hyperconcentration parameters were 7.44% and 11.16%, respectively, and the reduction rate of the affected area parameters was 14.07%.

[0206] 4. Analysis of skin indentation elastic recovery

[0207] Compared with before using the product, the elastic recovery force of skin indentation showed a significant increase (p<0.05) after using the product for 2 weeks and 4 weeks, with the increase rates being 12.78% and 21.82%, respectively.

[0208] 5. Skin moisture (density) analysis

[0209] Compared with before using the product, skin moisture (density) showed a significant increase just after using the product and 4 weeks later (p<0.05), with the increase rates being 226.79% and 12.07%, respectively.

[0210] 6. Skin tightness analysis

[0211] Compared with before using the product, skin firmness showed a significant increase (p<0.05) at 2 and 4 weeks after using the product, with the increase rates being 8.60% and 17.90%, respectively.

[0212] 7. Skin firmness analysis

[0213] Compared with before using the product, the volume of the double chin area showed a significant reduction (p<0.05) just after using the product and after 4 weeks of use, with the reduction rates being 10.14% and 21.74%, respectively.

[0214] In addition, referring to the diagram of the method for transmitting heat energy to the dermis through the skin management device 1 of the present invention, Fig.11 (a) and the diagram showing the heat energy transmitted to the dermis by the skin management device of the comparative invention Fig.11 (b) shows that in the case of the skin care device 1 of the present invention, heat energy is uniformly transferred from the upper dermis to the lower dermis, while in the case of the skin care device of the comparative invention, heat energy is not transferred to the lower dermis when heat energy is transferred to the upper dermis. In terms of such heat energy transfer efficiency, the present invention is more excellent. Here, in the case of the skin care device of the comparative invention, a fixed RF frequency electrode is used and the frequency is changed in time units of more than 2 seconds to transfer energy to the epidermis and the lower dermis at the same time, which is one of the products currently sold on the market.

[0215] The features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present invention and need not be limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined into another embodiment or modified into another embodiment by a person skilled in the art for implementation. Therefore, the contents related to such combination and modification are all included in the scope of the present invention.

[0216] In addition, the above description is centered on the embodiment, but this is only for illustration, and the present invention is not limited thereto. A person skilled in the art can make many modifications and applications not shown above within the scope of the essential characteristics of the present embodiment. For example, each component specifically shown in the embodiment can be modified and implemented. Moreover, the differences related to such modifications and applications are all included in the scope of the present invention defined in the claims.

Claims

1. A skin care device, comprising: a main body including a first terminal; and a head connected to the main body and detachable from the main body, The above header includes: a housing including a storage space therein; A substrate, which is disposed in the housing; an electrode portion disposed in the housing and on the substrate; and A second terminal is disposed at the lower portion of the substrate and is electrically connected to the first terminal of the main body. The electrode unit includes: A first electrode disposed at the center of the head; Second electrodes, which surround the first electrodes and are arranged at equal intervals; third electrodes surrounding the second electrodes and arranged at equal intervals; and a fourth electrode surrounding the third electrode and arranged at equal intervals, The first electrode, the second electrode, the third electrode and the fourth electrode operate in a first RF mode. In the first RF mode, different frequencies are applied alternately to any two of the first, second, third and fourth electrodes at a set period, so that high-frequency heat energy is evenly transferred from the upper dermis to the lower dermis.

2. The skin care device according to claim 1, wherein: In the first RF mode, the frequencies to be used for the first electrode, the second electrode, the third electrode, and the fourth electrode are set to four frequencies within a high frequency range of 1 MHz to 3 MHz. The four frequencies are set in order from longest to shortest as a first frequency, a second frequency, a third frequency, and a fourth frequency.

3. The skin care device according to claim 2, wherein: The first frequency is set to 2.2Mhz. The second frequency is set to 1.8 MHz. The third frequency is set to 1.4 MHz. The fourth frequency is set to 1.0 MHz.

4. The skin care device according to claim 2, wherein: The skin management device also includes an acceleration mode for rapidly transferring heat to the skin before starting the first RF mode. Select any one of the acceleration levels 1, 2, and 3, which are set in order of acceleration time from short to long, to start the above acceleration mode. supplying the current of the first frequency to the third electrode and the fourth electrode at a duty ratio of 100%, A negative current is applied to one of the third electrode and the fourth electrode, and a positive current is applied to the other electrode.

5. The skin care device according to claim 4, wherein: In the first RF mode, the first RF mode is automatically executed for a predetermined time period from the time when the acceleration mode is ended, and the first RF mode is automatically interrupted when the predetermined time has passed. The first RF mode is performed by dividing into step 1 and step 2 in the following manner: when currents of any two frequencies of the first frequency, the second frequency, the third frequency, and the fourth frequency are applied alternately to any two electrodes of the first electrode, the second electrode, the third electrode, and the fourth electrode at a set period, no current is supplied to the other two electrodes.

6. The skin care device according to claim 5, wherein: In the first RF mode mentioned above, In the above step 1, during the first set time, the current of the second frequency and the current of the fourth frequency are alternately applied to the first electrode and the second electrode respectively several to several dozen times with a cycle of less than 1 second, In the above step 2, during the above first set time, the currents of the above first frequency and the above third frequency are alternately applied to the above third electrode and the fourth electrode respectively at a period of less than 1 second for several to several dozen times, A negative current is applied to one of the first electrode and the second electrode or the third electrode and the fourth electrode, and a positive current is applied to the other electrode. The step 1 and the step 2 are alternately performed with a second set time interval during which no current is supplied to the first electrode, the second electrode, the third electrode, and the fourth electrode.

7. The skin care device according to claim 6, wherein: The first set time becomes longer from the acceleration level 1 to the acceleration level 3. The second set time is relatively shortened from the acceleration level 1 to the acceleration level 3.

8. The skin care device according to claim 5, wherein: After the acceleration mode, the first RF mode is repeatedly executed for a predetermined time in the order of step 1 -> step 2 -> step 1 -> step 2.

9. The skin care device according to claim 1, wherein: The first electrode, the second electrode, the third electrode, and the fourth electrode operate in a first EMS mode instead of the first RF mode. In the first EMS mode mentioned above, The first EMS mode is performed by dividing into step 3, step 4, and step 5 as follows: when a current of the fifth frequency is applied to any two electrodes of the first electrode, the second electrode, the third electrode, and the fourth electrode at a set period, no current is supplied to the other two electrodes. In the above step 3, the current of the fifth frequency is applied to the third electrode and the fourth electrode respectively. In the above step 4, the current of the fifth frequency is applied to the first electrode and the fourth electrode respectively. In the above step 5, the current of the fifth frequency is applied to the first electrode and the second electrode respectively. A negative current is applied to one of the third electrode and the fourth electrode, the first electrode and the fourth electrode, or the first electrode and the second electrode, and a positive current is applied to the other electrode.

10. The skin care device according to claim 9, wherein: In the first EMS mode mentioned above, In each of the above steps 3, 4, and 5, any one of the stimulation levels 1, 2, and 3 set in order from short to long in a manner that makes the stimulation time different is selected and executed, Between the step 3, the step 4, and the step 5, no current is supplied to the first electrode, the second electrode, the third electrode, and the fourth electrode during a predetermined time period.

11. The skin care device according to claim 9, wherein: The first EMS mode is performed by repeating the order of step 3 -> step 4 -> step 5 -> step 4 -> step 3 -> step 4 -> step 5 -> step 4 for a predetermined time.

12. The skin care device according to claim 1, wherein The first electrode, the second electrode, the third electrode, and the fourth electrode operate in the RF+EMS mode instead of the first RF mode. The RF+EMS mode is performed by performing the second RF mode on any two electrodes among the first electrode, the second electrode, the third electrode and the fourth electrode and performing the second EMS mode on the other two electrodes, divided into steps 6, 7 and 8.

13. The skin care device according to claim 12, wherein: In the above step 6, the above first electrode and the second electrode perform the above second RF mode, and the above third electrode and the fourth electrode perform the second EMS mode. In the above step 7, the second electrode and the third electrode perform the above second RF mode, and the first electrode and the fourth electrode perform the above second EMS mode. In the step 8, the third electrode and the fourth electrode perform the second RF mode, and the first electrode and the second electrode perform the second EMS mode.

14. The skin care device according to claim 13, wherein: In the second RF mode, the frequencies used for the first electrode, the second electrode, the third electrode, and the fourth electrode are set to four frequencies within a high frequency range of 1 MHz to 3 MHz. The four frequencies are set in order from longest to shortest as the first frequency, the second frequency, the third frequency, and the fourth frequency. In the second EMS mode, the frequencies used for the first electrode, the second electrode, the third electrode, and the fourth electrode are set to a fifth frequency within a low frequency range.

15. The skin management device according to claim 14, wherein The skin management device also includes an acceleration mode for rapidly transferring heat to the skin before starting the second RF mode. In the above acceleration mode, Select any one of the acceleration levels 1, 2, and 3, which are set in order of acceleration time from short to long, and operate. supplying the current of the first frequency to the third electrode and the fourth electrode at a duty ratio of 100%, A negative current is applied to one of the third electrode and the fourth electrode, and a positive current is applied to the other electrode.

16. The skin management device according to claim 15, wherein In the above second RF mode, In the step 6, during the first set time, currents of the first frequency and the second frequency are applied alternately to the first electrode and the second electrode several to several dozen times with a cycle of less than 1 second. In the above step 7, during the above first set time, the current of the second frequency and the current of the third frequency are alternately applied to the above second electrode and the third electrode respectively for several to several dozen times with a cycle of less than 1 second. In the step 8, during the first set time, currents of the third frequency and the fourth frequency are applied alternately to the third electrode and the fourth electrode several to several dozen times with a period of less than 1 second. applying a negative current to one of the first electrode and the second electrode, the second electrode and the third electrode, or the third electrode and the fourth electrode, and applying a positive current to the other electrode, Step 6, Step 7, and Step 8 are alternately performed with a second set time interval during which no current is supplied to the first electrode, the second electrode, the third electrode, and the fourth electrode, respectively. The first set time becomes longer from the acceleration level 1 to the acceleration level 3. The second set time becomes relatively shorter from the acceleration level 1 to the acceleration level 3. In the above second EMS mode, In the above step 6, the current of the fifth frequency is applied to the third electrode and the fourth electrode respectively. In the above step 7, the current of the fifth frequency is applied to the above first electrode and the fourth electrode respectively. In the above step 8, the current of the fifth frequency is applied to the first electrode and the second electrode respectively. A negative current is applied to one of the third electrode and the fourth electrode, the first electrode and the fourth electrode, or the first electrode and the second electrode, and a positive current is applied to the other electrode.

17. The skin management device according to claim 16, wherein: In the above second EMS mode, In each of the above steps 6, 7, and 8, any one of stimulation level 1, stimulation level 2, and stimulation level 3, which are set in order from short to long in a manner that the stimulation time is different, is selected and executed, Between step 6, step 7, and step 8, no current is supplied to the first electrode, the second electrode, the third electrode, and the fourth electrode during a predetermined time period.

18. The skin management device according to claim 12, wherein: In the second RF mode and the second EMS mode, the RF+EMS mode is performed by repeating the order of step 6 -> step 7 -> step 8 -> step 7 -> step 6 -> step 7 -> step 8 -> step 7 for a predetermined time.

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