Patent Publication Number: US-2022211162-A1

Title: Skin care apparatus

Description:
TECHNICAL FIELD 
     The present invention relates to a skin care apparatus, and in particular, to a skin care apparatus capable of intensive care of eye rims and forehead. 
     BACKGROUND ART 
     With the development of beauty industry, people&#39;s interest is increasing in skin care services for improving skin tone or wrinkles as well as products such as basic cosmetics and color cosmetics. 
     Meanwhile, the effect of skin care generally appears when the skin care is received continuously for a long period of time rather than when the skin care is received for a short period of time. Therefore, it is important to receive continuous skin care in order for a user to acquire effects such as skin tone improvement or wrinkle improvement. 
     However, users have difficulty in continuing to receive skin care due to reasons such as lack of access to places where skin care services are provided and lack of time. 
     Therefore, it is required to develop a skin care apparatus that provides a skin care function at a place desired by the user and at a time desired by the user. 
     DISCLOSURE 
     Technical Problem 
     An object of the present invention is to provide a skin care apparatus that is easy to use. 
     An object of the present invention is to provide a skin care apparatus that cares for the skin such as eye rims, forehead, and the like. 
     An object of the present invention is to provide a skin care apparatus capable of customized care for each skin area such as eye rims, forehead, and the like. 
     An object of the present invention is to provide a skin care apparatus that may be used by adhering a sheet to a face. 
     An object of the present invention is to provide a skin care apparatus capable of not only bringing a sheet into contact with a face, but also giving a heating effect or a vibration effect to a portion of the face with which the sheet is in contact. 
     Technical Solution 
     A skin care apparatus according to an embodiment of the present invention includes a main body, and a mounting body for mounting the main body on a user&#39;s face, wherein the main body is formed with a sheet accommodation part in which a sheet is accommodated, the main body includes at least one first area with which the sheet accommodated in the sheet accommodation part is in contact, and a second area between an edge of the main body and the first area, and a thickness of the first area may be smaller than a thickness of the second area. 
     The thickness of the first area may be an average thickness of the first area, and the thickness of the second area may be an average thickness of the second area. 
     The main body may be formed with an opening corresponding to the user&#39;s eyes, and at least a part of the first area may overlap the opening in a vertical direction. 
     The first area is provided to the main body in pairs, the pair of first areas are spaced apart from each other in left and right directions, and the main body includes a left area including the first area positioned on the left of the pair of first areas, a right area including the first area positioned on the right of the pair of first areas, and a central area between the left area and the right area, wherein an average thickness of the central area may be greater than each of an average thickness of the left area and an average thickness of the right area. 
     The main body may further include an outer body, an inner body disposed on a rear surface of the outer body and having an inner surface facing the user&#39;s face, and a vibration module disposed between the outer body and the inner body. 
     The main body may further include an outer body, an inner body disposed on a rear surface of the outer body and having an inner surface facing the user&#39;s face, and a heat generating module disposed between the outer body and the inner body. 
     A thickness of the inner body may be smaller than a thickness of the outer body. 
     The heat generating module may overlap the first area in a horizontal direction. 
     The sheet accommodation part may further include a rib for guiding the mounting of the sheet. 
     A thickness of the rib may be smaller than a thickness of the sheet. 
     The sheet accommodation part may be formed with a recessed portion for accommodating the sheet. 
     A depth of the recessed portion may be smaller than the thickness of the sheet. 
     The sheet may be detached/attached from/to the sheet accommodation part. 
     The main body may be formed of silicone, thermo plastic elastomer (TPE), or urethane. 
     A skin care apparatus system according to an embodiment of the present invention includes a terminal, and a skin care apparatus including a communication module for transmitting and receiving a signal to and from the terminal, wherein the skin care apparatus includes a main body, and a mounting body for mounting the main body on a user&#39;s face, and the main body is formed with a sheet accommodation part in which a sheet is accommodated, the main body includes at least one first area with which the sheet accommodated in the sheet accommodation part is in contact, and a second area between an edge of the main body and the first area, and a thickness of the first area may be smaller than a thickness of the second area. 
     The skin care apparatus may further include a vibration module mounted on the main body, and a processor for setting an operation method of the vibration module based on a control command received from the terminal. 
     The processor may set vibration intensity of the vibration module disposed at a position corresponding to the first area to be different from vibration intensity of the vibration module disposed at a position corresponding to the second area. 
     The skin care apparatus may further include a heat generating module mounted on the main body, and a processor for setting an operation method of the heat generating module based on a control command received from the terminal. 
     The skin care apparatus may further include a processor for setting an operation method based on at least one piece of environmental information and user information received from the terminal. 
     Advantageous Effects 
     According to the present invention, by forming a thickness of an area with which a sheet is in contact to be smaller than a thickness of an area with which the sheet is not in contact, the area with which the sheet is not in contact prevents a skin care apparatus from being excessively pressed against a face of a user, thereby serving as a frame. In addition, in this case, since a separate additional member for the frame is not required, there is advantage that an assembly process can be simplified and manufacturing costs can be reduced. 
     In addition, since the thickness of the area with which the sheet is in contact is formed to be smaller, vibration or heat generated from a vibration module or a heat generating module disposed around the sheet can be more easily transmitted to the sheet, and accordingly, there is advantage that it is possible to improve a rate at which ingredients contained in the sheet are absorbed by the skin. 
     In addition, since thicknesses of both side areas of a main body are formed to be smaller than a thickness of a central area thereof, the bending of both side areas can be easier than that of the central area, and accordingly, there is an advantage that it is possible to adhere the entire main body to the face regardless of different face shapes and face sizes for each user. 
     It is possible to minimize loss in a process of transferring vibration or heat generated from the vibration module or the heat generating module to the user&#39;s face by forming a thickness of an inner body to be smaller than a thickness of an outer body, and accordingly, there is an advantage that it is possible to protect the vibration module or the heat generating module from the outside. 
     A rib or a recessed portion can guide an attachment position when the user attaches the sheet to a sheet accommodation part, and accordingly, there is an advantage that it is possible to provide convenience. In addition, there is an advantage that it is possible to maximize a contact area between the sheet and the user&#39;s face by forming a thickness of the rib or a depth of the recessed portion to be smaller than a thickness of the sheet. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating a front of a skin care apparatus according to an embodiment of the present invention. 
         FIG. 2  is a perspective view illustrating a rear surface of the skin care apparatus according to the embodiment of the present invention. 
         FIG. 3  is a perspective view illustrating a main body according to an embodiment of the present invention. 
         FIG. 4  is a perspective view illustrating a state in which the main body and a sheet shown in  FIG. 3  are attached. 
         FIG. 5  is a cross-sectional view taken along line A-A′ of  FIG. 3 . 
         FIG. 6  is a cross-sectional view taken along line B-B′ of  FIG. 3 . 
         FIG. 7  is a cross-sectional view taken along line C-C′ of  FIG. 3 . 
         FIG. 8  is a perspective view illustrating a main body according to another embodiment of the present invention. 
         FIG. 9  is a cross-sectional view taken along line D-D′ of  FIG. 8 . 
         FIG. 10  is a view illustrating a main body and a mounting body in which an inner body and an outer body are separated according to the embodiment of the present invention. 
         FIG. 11  is a control block diagram of a skin care apparatus according to an embodiment of the present invention. 
         FIG. 12  is a view illustrating a piezoelectric sensor that may be provided in the skin care apparatus according to the embodiment of the present invention. 
         FIG. 13  is a view illustrating an inner surface of a main body according to another embodiment of the present invention. 
         FIG. 14  is a view illustrating a contact time sensing device that may be provided in a skin care apparatus according to an embodiment of the present invention. 
         FIG. 15  is a view illustrating an optical vibration composite device that may be provided in the skin care apparatus according to the embodiment of the present invention. 
         FIG. 16  is a view illustrating a tunable light emitting module that may be provided in the skin care apparatus according to the embodiment of the present invention. 
         FIG. 17  is a view illustrating a skin thickness measurement device that may be provided in the skin care apparatus according to the embodiment of the present invention. 
         FIGS. 18A to 18B  are views illustrating a linear ultrasound module that may be provided in the skin care apparatus according to the embodiment of the present invention. 
         FIG. 19  is a view illustrating a composite skin thickness measurement device that may be provided in the skin care apparatus according to the embodiment of the present invention. 
         FIG. 20  is a control block diagram of a skin care apparatus system including the skin care apparatus according to the embodiment of the present invention. 
     
    
    
     MODES OF THE INVENTION 
     Hereinafter, the present invention will be described in more detail with reference to the drawings. 
     The suffixes “module” and “part” for the elements used in the following description are given in consideration of only the ease of creating the specification, and do not impart a particularly important meaning or role by themselves. Therefore, the “module” and “part” may be used interchangeably with each other. 
     The terms “first,” “second,” etc. may be used herein to describe various elements, but these elements should not be limited by these terms. These terms are only used to distinguish one element from another. 
     A singular expression includes a plural expression unless the context clearly refers to otherwise. 
     It will be further understood that the terms “comprises,” “comprising,” “includes” and/or “including,” when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
       FIG. 1  is a perspective view illustrating a front of a skin care apparatus according to an embodiment of the present invention.  FIG. 2  is a perspective view illustrating a rear surface of the skin care apparatus according to the embodiment of the present invention. 
     A skin care apparatus  1  according to the embodiment of the present invention may include a main body  100  and a mounting body  200 . 
     At least a portion of the main body  100  may be in contact with a user&#39;s face and provide a skin care function to the user&#39;s face. A stimulation providing unit for providing the skin care function to the user&#39;s face may be disposed on the main body  100 . The stimulation providing unit provides stimulation to the user&#39;s face and the skin of the user. The stimulation providing unit may include a module that generates vibration, light, heat, and the like. 
     In addition, the main body  100  may be provided with a power button  60   a , and a power module  60  may be turned on or off according to an input of pressing the power button  60   a . As the power module  60  is turned on, various components provided in the skin care apparatus  1  may be supplied with power. A shape and position of the power button  60   a  are merely illustrative, and thus the embodiment is not limited thereto. 
     An opening  102  corresponding to the user&#39;s eyes may be formed in the main body  100 . The opening  102  may include a left opening  102   a  corresponding to the user&#39;s left eye and a right opening  102   b  corresponding to the user&#39;s right eye. 
     The opening  102  may secure a field of view of the user mounting the skin care apparatus  1 . 
     The mounting body  200  may be connected to the main body  100 . Meanwhile, according to the embodiment, the skin care apparatus  1  may further include connection bodies  203  and  204  for connecting the main body  100  and the mounting body  200 . 
     The mounting body  200  may mount the main body  100  on the user&#39;s face. 
     According to an embodiment, the mounting body  200  may be connected to both side ends of the main body  100  and may be mounted to surround the head of the user. In this case, the mounting body  200  may be made of a material such as rubber with elasticity and may be formed in a band shape. Therefore, when the skin care apparatus  1  is mounted on the user, the mounting body  200  may closely contact the main body  100  toward the user&#39;s face. 
     The mounting body  200  may include a left mounting member  201  and a right mounting member  202 . The left mounting member  201  may be closely connected to the left opening  102   a  of the left opening  102   a  and the right opening  102   b , and the right mounting member  202  may be closely connected to the right opening  102   b  of the left opening  102   a  and the right opening  102   b.    
     When the skin care apparatus  1  further includes the connecting bodies  203  and  204 , the connecting bodies  203  and  204  may include a left connecting body  203  connecting the left mounting member  201  to the main body  100  and a right connecting body  204  connecting the right mounting member  202  to the main body  100 . 
     Meanwhile, the left connection body  203  and the right connection body  204  may be integrally formed with the main body  100 . 
     Meanwhile, the mounting body  200  may further include a nose mounting portion  210 . The nose mounting portion  210  may be mounted and supported on the user&#39;s nose, and in this case, the main body  100  may be mounted on the user&#39;s face. 
     The nose mounting portion  210  may be formed in a shape in which a lower end of the main body  100  is recessed between the left opening  102   a  and the right opening  102   b . When the skin care apparatus  1  is mounted on the user&#39;s face, the user&#39;s nose may be positioned at a recessed portion between the left opening  102   a  and the right opening  102   b.    
     Meanwhile, the main body  100  may be made of a flexible material. For example, the main body  100  may be formed of a material such as silicone, thermo plastic elastomer (TPE), or urethane, but it is merely illustrative for convenience of description, and the main body  100  may be formed of various materials capable of being adhered to the user&#39;s face. When the main body  100  is formed of a material such as silicone, thermo plastic elastomer (TPE), or urethane, there is advantage that it may be waterproof so that washing with water is easy. 
     Similarly, the mounting body  200  may also be made of a flexible material. As described in the main body  100 , the mounting body  200  may be formed of a material such as silicone, TPE, or urethane, but it is merely illustrative for convenience of description, and thus the embodiment is not limited thereto. 
     The main body  100  may be formed with a sheet accommodation part  110  in which a sheet  2  (see  FIG. 4 ) is accommodated. The sheet  2  may be detached/attached from/to the sheet accommodation part  110 . 
     The sheet accommodation part  110  may be a guide for guiding a position of the sheet  2  when the sheet  2  is attached to the main body  100 . The sheet accommodation part  110  may be a sheet fixing guide for preventing the sheet  2  attached to the main body  100  from moving or falling down. 
     The sheet  2  may be made of a material containing nutrients and moisturizing ingredients for skin care and the material may be made of a nonwoven fabric such as cotton or cloth, or a hydrogel. 
     According to the embodiment, the sheet  2  may include a microneedle containing an effective ingredient. A material of the microneedle may be a solid-type such as a metal material, silicone, and the like, or may be a soluble-type that is dissolved when applied to the skin using a self-degradable material, a biodegradable material, or the like. A wrinkle improvement and whitening efficacy material such as botox, retinol, hyaluronic acid, and the like may be included in the microneedle. When the microneedle is in close contact with the skin, the efficacy material may penetrate deep into the skin. When the skin care apparatus  1  proposed in the present invention is worn on the face, the microneedles may be smoothly attached and absorbed by making the skin care apparatus  1  to be in close contact with and to press the face. 
     Meanwhile, the shape of the sheet  2  may be the same as the shape of the sheet accommodation part  110 . Specifically, a shape of the outer circumference of the sheet  2  may be the same as a shape of the inner circumference of the sheet accommodation part  110 . 
     As described above, the sheet  2  formed in the same shape as the sheet accommodation part  110  may be referred to as a dedicated product used only for the production of the skin care apparatus  1 . 
     In addition, the sheet  2  formed in the same shape as the sheet accommodation part  110  as described above may be referred to as a dedicated product used only for the use of the skin care apparatus  1 . 
     The sheet accommodation part  110  may be formed on a surface that is in contact with the user&#39;s face when the main body  100  is mounted on the user&#39;s face. The sheet accommodation part  110  may be formed on a rear surface of the main body  100 , in particular, on an inner surface  21  of an inner body  20  (see  FIG. 5 ) to be described later. 
     As shown in  FIG. 2 , the sheet accommodation part  110  may be formed below the opening  102 . The sheet accommodation part  110  may include a left sheet accommodation part  110   a  formed below the left opening  102   a  and a right sheet accommodation part  110   b  formed below the right opening  102   b.    
     However, a position of the sheet accommodation part  110  shown in  FIG. 2  is merely illustrative, and the sheet accommodation part  110  may be formed above the opening  102  or formed between the left opening  102   a  and the right opening  102   b.    
       FIG. 3  is a perspective view illustrating a main body according to an embodiment of the present invention,  FIG. 4  is a perspective view illustrating a state in which the main body and a sheet shown in  FIG. 3  are attached,  FIG. 5  is a cross-sectional view taken along line A-A′ of  FIG. 3 ,  FIG. 6  is a cross-sectional view taken along line B-B′ of  FIG. 3 , and  FIG. 7  is a cross-sectional view taken along line C-C′ of  FIG. 3 . 
     The main body  100  may include at least one first area A 1  with which the sheet  2  accommodated in the sheet accommodation part  110  is in contact and a second area A 2  with which the sheet  2  is not in contact. The second area A 2  may be an area between an edge  101  of the main body  100  and the first area A 1 . 
     At least a part of the first area A 1  may overlap the opening  102  in a vertical direction. 
     The first area A 1  may be a surface with which the sheet  2  is in contact and a surface that is waterproofed so that ingredients contained in the sheet  2  are not absorbed into the main body  100 . Alternatively, a material of the first area A 1  and a material of the second area A 2  may be different from each other. 
     According to the embodiment, the sheet accommodation part  110  may include a rib  23  guiding the attachment of the sheet  2 . The rib  23  may be formed in the second area A 2 . The rib  23  may be formed to protrude from the inner surface  21  toward the user&#39;s face. The rib  23  may be formed along the outer circumference of the first area A 1 . 
     A cross-sectional shape of the first area A 1  may be the same as that of the sheet  2 . An area of the first area A 1  may be greater than or equal to an area of the sheet  2 . 
     The sheet  2  may be attached to at least some or all of the first area A 1 . In a state in which the sheet  2  is attached to the first area A 1 , the main body  100  may be mounted on the user&#39;s face, and the sheet  2  may be adhered to the user&#39;s face by the mounting body  200 . 
     The first area may be provided to the main body in pairs, the pair of first areas may be spaced apart from each other in left and right directions. One of the pair of first areas A 1  may be formed in the left sheet accommodation part  110   a , and the other of the pair of first areas A 1  may be formed in the right sheet accommodation part  110   b.    
     Meanwhile, as shown in  FIG. 4 , the main body  100  may be divided into three areas. However, the imaginary line dividing the three areas shown in  FIG. 4  is merely illustrative, and thus the embodiment is not limited thereto. 
     When the main body  100  is divided into three areas, the main body  100  may include a left area L including the first area A 1  positioned on the left of the pair of first areas A 1 , a right area R including the first area A 1  positioned on the right of the pair of first areas A 1 , and a central area C between the left area L and the right area R. 
     In this case, an average thickness of the central area C may be greater than each of an average thickness of the left area L and the average thickness of the right area R. The average thickness of the left area L and the average thickness of the right area R may be the same. When the main body  100  is mounted on the user&#39;s face, the main body  100  may be bent according to the shape of the face and may be adhered to the user&#39;s face. At this time, since a degree of bending of both areas L and R of the main body  100  is greater than a degree of bending of the central area C, the average thickness of both areas L and R is formed smaller than the average thickness of the center area C, and accordingly, there is an advantage that it is possible to provide wearing convenience. 
     For example, the maximum thickness of the central area C may be 5.26 mm, and the maximum thickness of both side areas L and R may be 5.18 mm. 
     Meanwhile, the thickness of the first area A 1  may be smaller than that of the second area A 2 . 
     In particular, the main body  100  may have the central area of the forehead that is formed to be the thickest. A thickness of the central area of the forehead may be 5T (=5 mm) or more. 
     Meanwhile, the main body  100  may include an outer body  10  and an inner body  20 . The main body  100  may be formed in a form in which the outer body  10  and the inner body  20  are coupled. 
     The stimulation providing unit may be disposed on the main body  100 . The stimulation providing unit may include a vibration module  30  (see  FIG. 6 ), and a heat generating module  40  (see  FIG. 7 ) to be described later. At least one of the vibration module  30  (see  FIG. 6 ) and the heat generating module  40  (see  FIG. 7 ) may be disposed between the outer body  10  and the inner body  20 . 
     The outer body  10  may have a rear surface  11  that is at least partially in contact with the inner body  20  and an outer surface  12  that is opposite to the rear surface  11 . When the main body  100  is mounted on the user&#39;s face, the outer surface  12  may be the outermost surface. 
     The inner body  20  may have the inner surface  21  facing the user&#39;s face and a mounting surface  22  that is an opposite surface to the inner surface  21 . At least a portion of the mounting surface  22  may be in contact with the rear surface  11  of the outer body  10 . 
     The stimulation providing unit such as the vibration module  30  may be disposed on the rear surface  11  of the outer body  10  or the mounting surface  22  of the inner body  20 . The stimulation providing unit may include a temperature control module  40 , an ion module  42 , a far-infrared ray module  44 , a light emitting module  46 , and the like that are described later in addition to the vibration module  30 . 
     According to an embodiment, the main body  100  may be manufactured in a manner that the outer body  10  covers the inner body  20  after the vibration module  30  is disposed on the mounting surface  22  of the inner body  20 . According to another embodiment, the main body  100  may be manufactured in a manner that the inner body  20  is coated on the outer body  10  after the vibration module  30  is disposed on the rear surface  11  of the outer body  10 . That is, the vibration module  30  may be disposed at an arbitrary position between the inner body  20  and the outer body  10 . In addition, according to the embodiment, the vibration module  30  may also be mounted on the inner surface  21  of the inner body  20 . 
     Referring to  FIG. 6 , the vibration module  30  may be disposed to protrude from the mounting surface  22  of the inner body  20  toward the outer body  10 . 
     The vibration module  30  may be disposed in at least one of the first area A 1  and the second area A 2 . 
     For example, eight vibration modules  30  may be installed in the skin care apparatus  1 , and first to second vibration modules  30  may be disposed in an area corresponding to the first area A 1  positioned on the left, third to fourth vibration modules  30  may be disposed in the area corresponding to the first area A 1  positioned on the right, and fifth to eighth vibration modules  30  may be disposed in an area corresponding to the second area A 2 . The fifth to eighth vibration modules  30  may be disposed to be spaced apart from each other in the left-right direction in the area corresponding to the second area A 2  and may be disposed side by side in a row. However, the number and position of the vibration modules  30  are merely illustrative, and thus the embodiment is not limited thereto. 
     Meanwhile, a thickness T 1  of the rib  23  may be smaller or equal to a thickness T 2  of the sheet  2 . 
     In particular, as shown in  FIG. 6 , the thickness T 1  of the rib  23  may be smaller than the thickness T 2  of the sheet  2 , and in this case, the effect that the sheet  2  is adhered to the user&#39;s face may be improved. Specifically, when the thickness T 1  of the rib  23  is greater than the thickness T 2  of the sheet  2 , the rib  23  are first in contact with the user&#39;s face, and thus a separate space between the sheet  2  and the user&#39;s face may be formed by the rib  23 . Therefore, the facial adhesion effect of the sheet  2  when the thickness T 1  of the rib  23  is smaller than the thickness T 2  of the sheet  2  may be higher than the facial adhesion effect of the sheet  2  when the thickness T 1  of the rib  23  is greater than the thickness T 2  of the sheet  2 . 
     Meanwhile, a thickness T 3  of the inner body  20  excluding the rib  23  may be smaller than the thickness T 1  of the rib  23  and the thickness T 2  of the sheet  2 . In this case, there is an advantage that the effect of the stimulation providing unit such as the vibration module  30  disposed between the outer body  10  and the inner body  20  may be effectively transmitted to the user&#39;s face. Specifically, since the vibration module  30  is disposed between the outer body  10  and the inner body  20 , vibration generated from the vibration module  30  should pass through the inner body  20  to be transmitted to the user&#39;s face. Therefore, as the thickness T 3  of the inner body  20  is smaller, the effect of the vibration module  30  transmitted to the user&#39;s face may be improved. 
     Meanwhile, the temperature control module  40  may be further disposed on the mounting surface  22  of the inner body  20 . For example, the temperature control module  40  may be disposed to protrude from the mounting surface  22  of the inner body  20  toward the outer body  10 . 
     The temperature control module  40  may be disposed at a position corresponding to eye rims, temples, forehead, an area between eyebrows, acupuncture points, etc. As an example, the temperature control module  40  may be disposed at a position overlapping the first area A 1  in a horizontal direction. For example, two temperature control modules  40  may be installed in the skin care apparatus  1 , and a first temperature control module  40  may be disposed in an area corresponding to the first area A 1  positioned on the left. In addition, a second temperature control module  40  may be disposed in an area corresponding to the first area A 1  positioned on the right. However, the number and positions of the temperature control modules  40  are merely illustrative, and thus the embodiment is not limited thereto. According to the embodiment, the temperature control module  40  may include a heat generating element, and the heat generating element may discharge heat having a heat generation temperature. In this case, the heat generation temperature may be a temperature between 24° C. and 39° C., which is easily absorbed into the skin and may have a temperature at which moisturizing ingredients may be absorbed into the skin. It is possible to promote absorption of nutrients, moisturizing ingredients, and the like contained in the sheet  2  into the user&#39;s face through heat generation. 
     According to another embodiment, the temperature control module  40  may include an element (e.g., a thermoelectric element) that performs a cooling function. In this case, the temperature control module  40  may cool at least one portion of the user&#39;s face. 
     That is, the temperature of the temperature control module  40  may be set differently depending on a function, a skin condition of the user, and an environmental condition (season, etc.). It is possible to generate effects such as alleviating fatigue around the eyes and wrinkles due to a cool-feeling during cooling and to generate effects such as improvement of blood circulation around the eyes and alleviating dark circles during heating. Meanwhile, the temperature control module  40  may operate together with the vibration module  30 , and in this case, there is an advantage that a massage function may also be provided to the user. 
     Since the thickness T 1  of the rib  23 , the thickness T 2  of the sheet  2 , the thickness T 3  of the inner body  20  excluding the rib  23 , etc. are the same as described in  FIG. 6 , duplicated descriptions are will be omitted. 
     In addition, as shown in  FIGS. 6 and 7 , the thickness of the first area A 1  may be smaller than that of the second area A 2 . The thickness of the first area A 1  may be an average thickness of the first area A 1 , and the thickness of the second area A 2  may be an average thickness of the second area A 2 . 
     In the case in which the main body  100  is formed of a flexible material, when the main body  100  is in close contact with the user&#39;s face, a portion of the nose or forehead that is relatively severely flexed or has protruding bones is excessively pressed, and thus a problem that causes inconvenience to the user may occur. 
     Therefore, the present invention has an advantage that may minimize excessive pressing of the main body  100  and protect the face by forming the thickness of the second area A 2  that is in close contact with the nose, forehead, etc. to be greater than the thickness of the first area A 1 . In addition, the present invention has an advantage that may improve the effect of the vibration module  30  and the sheet  2  transmitted to the user&#39;s face by forming the thickness of the first area A 1  to which the sheet  2  is attached to be smaller than the thickness of the second area 
     A 2 . 
     Therefore, since the skin care apparatus  1  according to the embodiment of the present invention does not include a frame, the number of parts may be reduced compared to the case of including the frame inside the main body  100 , and in this case, there is an advantage that may simplify the assembly process and reduce a cost. 
     Meanwhile, unlike shown in  FIGS. 2 to 7 , the sheet accommodation part  110  may not include the rib  23 , and a recessed portion  25  (see  FIG. 8 ) for accommodating the sheet  2  may be formed in the sheet accommodation part  110 . 
       FIG. 8  is a perspective view illustrating a main body according to another embodiment of the present invention, and  FIG. 9  is a cross-sectional view taken along line D-D″ of  FIG. 8 . 
     According to another embodiment of the present invention, the recessed portion  25  in which the sheet  2  is accommodated may be formed in the sheet accommodation part  110 . 
     The recessed portion  25  may be formed to be recessed from the inner surface  21  of the inner body  20 . The sheet  2  may be accommodated in the recessed portion  25  to be attached to the inner body  20 . In this case, as described above, the main body  100  may include the first area A 1  in contact with the sheet  2  and the second area A 2  with which the sheet  2  is not in contact. The second area A 2  may be an area between the edge  101  of the main body  100  and the first area A 1 . 
     The thickness of the first area A 1  with which the sheet  2  accommodated in the sheet accommodation part  110  is in contact may be smaller than the thickness of the second area A 2  with which the sheet  2  is not contact. A detailed description of this is the same as described above, and thus a duplicate description will be omitted. 
     Meanwhile, a depth T 4  of the recessed portion  25  may be smaller than the thickness T 2  of the sheet  2 . In this case, since the sheet  2  protrudes toward the user&#39;s face rather than the inner surface  21  when the sheet  2  is accommodated in the recessed portion  25 , the effect that the ingredients contained in the sheet  2  is absorbed into the face may be promoted. 
       FIG. 10  is a view illustrating a main body and a mounting body in which an inner body and an outer body are separated according to the embodiment of the present invention. 
     An outer openings  102   a - 1  and  102   b - 1  may be formed in the outer body  10 , and an inner openings  102   a - 2  and  102   b - 2  may be formed in the inner body  20 . 
     As shown in  FIG. 10 , the vibration module  30  may be disposed between the outer body  10  and the inner body  20 . For example, the vibration module  30  may be mounted on the mounting surface  22  of the inner body  20 . 
     Meanwhile, the skin care apparatus may further include a circuit board  99 , and the circuit board  99  may be disposed on any one connection body  204  as shown in  FIG. 10 . 
     The circuit board  99  may be a flexible PCB (FPCB). 
     However, a shape and position of the circuit board  99  are merely illustrative. According to the embodiment, the circuit board  99  may be disposed on the mounting surface  22  of the inner body  20 . 
     The circuit board  99  may be connected to the power module  60  and the vibration module  30  through at least one of a power supply line (not shown) and a signal line (not shown). 
     The power module  60  may be connected to the circuit board  99  and the vibration module  30  through the power supply line (not shown) to supply power to the circuit board  99  and the vibration module  30 . 
     The vibration module  30  may be connected to the power module  60  through the power supply line (not shown). 
     The power module  60  may be disposed on the mounting surface  22  of the inner body  20 . The power module  60  may be disposed at a position overlapping the power button  60   a  provided on the outer body  10  in a horizontal direction. 
     Meanwhile, a communication module  50  may be further disposed on the connection bodies  203  and  204 . However, the communication module  50  may be disposed on the mounting surface  22 . 
     The position of the power module  60  and a position of the communication module  50  shown in  FIG. 10  are merely illustrative for convenience of description, and thus the embodiment is not limited thereto. 
     The power module  60  may include a battery connecting part (not shown) from/to which a battery is detached/attached and may supply power supplied from the battery connected to the battery connecting part to the vibration module  30 . 
     As described above, the power module  60  may supplied with power from the outside in various ways. The above example is merely illustrative for convenience of description, and thus it is reasonable that the embodiment is not limited thereto. 
     The power module  60  may be turned on/off by the power button  60   a . The user may turn on or off power of the skin care apparatus  1  through the power button  60   a.    
     The power module  60  may be controlled so as to operate the vibration module  30  when the power of the skin care apparatus  1  is controlled to be turned on through the power button  60   a , and the power module  60  may be controlled so as to stop the operation of the vibration module  30  when the power of the skin care apparatus  1  is controlled to be turned off through the power button  60   a.    
     The vibration module  30  may vibrate for a set time. The vibration module  30  may be in direct/indirect contact with the user&#39;s skin to transmit vibration. The vibration module  30  may induce vibration by a vibrator that vibrates by an electric signal. 
     The skin care apparatus  1  may include a plurality of vibration modules  30 , and when the skin care apparatus  1  includes the plurality of vibration modules  30 , each of the plurality of vibration modules  30  may set individually the vibration intensity and the number of vibrations. Through this, there is an advantage that customized care for each skin region is possible by adjusting at least one of the vibration intensity and the number of vibrations according to the characteristics of the skin on which the vibration module  30  is disposed. 
     For example, it is assumed that the skin care apparatus  1  includes eight vibration modules  30 , four vibration modules  30  are disposed in the first area A 1 , and the remaining four vibration modules  30  are disposed in the second area A 2 . According to an embodiment, the vibration intensity and number of vibrations of the vibration module  30  disposed in the first area A 1  may be set to be the same as the vibration intensity and number of vibrations of the vibration module  30  disposed in the second area A 2 . According to another embodiment, the vibration intensity of the vibration module  30  disposed in the first area A 1  may be set to be smaller than the vibration intensity of the vibration module  30  disposed in the second area A 2 . According to still another embodiment, the number of vibrations of the vibration module  30  disposed in the first area A 1  may be set to be greater than the number of vibrations of the vibration module  30  disposed in the second area A 2 . However, the above-described examples are merely illustrative for convenience of description, and thus the embodiment is not limited thereto. 
     In addition, the skin care apparatus  1  may further include a stimulation providing unit other than the vibration module  30 . This will be described in detail in  FIG. 11 . 
       FIG. 11  is a control block diagram of a skin care apparatus according to an embodiment of the present invention. 
     The skin care apparatus  1  may include at least some or all of the vibration module  30 , the temperature control module  40 , the ion module  42 , the far-infrared ray module  44 , the light emitting module  46 , the communication module  50 , the power module  60 , a measurement module  70 , and a processor  90 . 
     The processor  90  may control at least one of the vibration module  30 , the temperature control module  40 , the ion module  42 , the far-infrared ray module  44 , the light emitting module  46 , the communication module  50 , the power module  60 , and the measurement module  70 . 
     The stimulation providing unit may include the vibration module  30 , the temperature control module  40 , the ion module  42 , the far-infrared ray module  44 , the light emitting module  46 , and the like. However, it is merely illustrative, and the skin care apparatus  1  according to the embodiment of the present invention may further include various modules capable of providing stimulation to the skin. 
     The temperature control module  40 , the ion module  42 , the far-infrared module  44 , the light emitting module  46 , and the like may be disposed between the outer body  10  and the inner body  20 . Alternatively, at least some of the temperature control module  40 , the ion module  42 , and the far-infrared ray module  44  may be disposed on the inner surface  21  of the inner body  20 . 
     The temperature control module  40  may include an element that generates a heating or cooling effect using the power supplied from the power module  60 . 
     For example, the skin care apparatus  1  may include a plurality of temperature control modules  40 . The plurality of temperature control modules  40  may be disposed in the first area A 1 , and when the temperature control module  40  disposed in the first area A 1  generates heat, there is an effect capable of promoting the absorption of the ingredients contained in the sheet  2  in contact with the first area A 1  into the skin. 
     However, it is merely illustrative, and the temperature control module  40  may have various positions as described above and generate a cooling effect as well as a heating effect. The ion module  42  may conduct electricity with the skin to supply at least one of positive and negative ions to the skin. The skin care apparatus  1  may remove skin impurities by supplying positive ions to the skin and circulate blood by supplying negative ions to the skin. 
     The ion module  42  may supply positive ions or negative ions through an alternating current or supply positive ions or negative ions through a galvanic current. In particular, when the ion module  42  supplies positive ions or negative ions to the skin through the galvanic current, there is an advantage of supplying positive ions or negative ions to the skin while minimizing skin irritation. 
     The processor  90  may control so that the ion module  42  generates only positive ions in a positive ion mode, the ion module  42  generates only negative ions in a negative ion mode, and the ion module  42  generates the positive ions and negative ions alternately in a complex mode. 
     In addition, the ion module  42  may further generate galvanic ions. 
     The far-infrared module  44  may emit far-infrared light in a wavelength band having a high transmission performance among infrared rays, and through this, it is possible to transmit light energy of the far-infrared light to the inside of the skin. The far-infrared light may penetrate the skin even though it is not in direct contact with the skin, and thus there is an advantage that the light energy may be effectively transmitted. 
     The light emitting module  46  may include an LED. The light emitting module  46  may differently adjust a color emitted from the LED according to a care mode. For example, the light emitting module  46  may emit red light in a first care mode, emit green light in a second care mode, emit blue light in a third care mode, and sequentially emit red light, green light, and blue light in a fourth care mode. As another example, the light emitting module  46  may emit red light, green light, and blue light individually or in combination. 
     Meanwhile, in the present invention, the temperature control module  40  and the light emitting module  46  have been described as separate configurations, but it is only described separately to distinguish functions, and thus it is reasonable that the embodiment is not limited thereto. 
     The stimulation providing unit may operate by receiving a control signal from a terminal  3  or a server  5  to be described later. 
     The measurement module  70  may include an impedance sensor for measuring moisture and oil of the skin of the user. The measurement module  70  may measure moisture, oil, and the like of the skin of the user through a measured value of the impedance sensor. 
     In addition, the measurement module  70  may further include an ultrasonic transducer and an ultrasonic sensor. The ultrasonic transducer may emit an ultrasonic beam in a form of a pulse and the ultrasonic sensor may sense that a beam emitted by the ultrasonic transducer is reflected at a boundary of the skin tissue to measure the skin thickness. It will be described in more detail in  FIG. 17 . 
     In addition, the measurement module  70  may further include a current sensor that senses an amount of current flowing through one region of the inner surface  21 . The current sensor monitors the amount of current to determine whether the user is mounted with the skin care apparatus  1 . For example, the current sensor may determine that the user has mounted or removed the skin care apparatus  1  when the amount of current is changed to the set value or more. 
     The processor  90  may set and control the vibration intensity and the number of vibrations of each of the plurality of vibration modules  30 . In addition, the processor  90  may set and control the heat generation temperature of each of the temperature control modules  40 . 
     The processor  90  may transmit and receive a signal to and from the terminal  3  or the server  5  to be described later through the communication module  50 . 
     The processor  90  may supply power to the vibration module  30 , the temperature control module  40 , the communication module  50 , and the processor  90  through the power module  60 . 
     Meanwhile, the skin care apparatus  1  may further include other components in addition to the components described in  FIG. 11 . Hereinafter, various components that the skin care apparatus  1  may have will be described. 
     For example, the skin care apparatus  1  may further include a piezoelectric sensor  410 , which will be described in detail with reference to  FIG. 12 . The piezoelectric sensor  410  may be connected to the circuit board  99 . 
       FIG. 12  is a view illustrating a piezoelectric sensor that may be provided in the skin care apparatus according to the embodiment of the present invention. 
     The piezoelectric sensor  410  may include a flexible substrate  410   a , a piezoelectric thin film layer  410   b  on the flexible substrate  410   a , an electrode  410   c  on the piezoelectric thin film layer  410   b , and a protective layer  410   d  on the electrode  410   c.    
     The piezoelectric thin film layer  410   b  may include an inorganic material having a perovskite structure. For example, the piezoelectric thin film layer  410   b  may include a material such as BaTiO3, LiNbO3, LiTaO3, KNbO3, and the like, but the embodiment is not limited thereto. 
     A skin care apparatus according to the related art has a problem that treatment or care is uniformly performed with a function set in the product itself rather than considering skin elasticity of the user to be treated. 
     In particular, in the related art, it is difficult to check in real time how much skin elasticity is improved during skin care. 
     Accordingly, the skin care apparatus  1  according to the present invention includes the piezoelectric sensor  410  having the piezoelectric thin film layer  410   b  disposed on the flexible substrate  410   a , and accordingly, there is a special technical effect that it is possible to measure skin elasticity in real time during skin care. 
     For example, there is a special technical effect that it is possible to measure skin elasticity in real time during skin care by detecting minute changes in skin elasticity through the piezoelectric thin film layer  410   b  and the electrode  410   c.    
     In order to increase the sensitivity of the skin elasticity change, a signal amplifying unit, a signal filtering unit, and the like may be further included. 
       FIG. 13  is a view illustrating an inner surface of a main body according to another embodiment of the present invention. 
     According to the embodiment, an adhesive layer  21   a  may be formed on an edge of inner surface  21 , and in this case, it is possible to increase the effect of skin care by increasing the adhesion between the skin care apparatus  1  and the facial skin. 
     For example, the adhesion to the skin is increased by arranging the adhesive layer  21   a  made of an acrylic monomer with high adhesion and biocompatibility on the edge of the inner surface  21 , and accordingly, the adhesion between the face mask and the facial skin is increased, thereby increasing the effecting of skin care. 
     The sheet  2  is positioned in the sheet accommodation part  110 , but the sheet  2  including a cosmetic formulation is more closely adhered to the face by disposing the adhesive layer  21   a  on the edge of the inner surface  21 , and accordingly, the effect of skin care is increased by active ingredients, and the adhesion between the face mask and the facial skin is increased, thereby increasing the effect of skin care. 
     In addition, the skin care apparatus  1  may further include a contact time sensing device  420 , which will be described in detail with reference to  FIG. 14 . The contact time sensing device  420  may be connected to the circuit board  99 . 
       FIG. 14  is a view illustrating the contact time sensing device that may be provided in the skin care apparatus according to the embodiment of the present invention. 
     The face mask may include the inner surface  21 , in particular, the contact time sensing device  420  disposed on the sheet accommodation part  110 . 
     The contact time sensing device  420  may include a monitor module  421 , a plurality of electrical contacts  422 , and a plurality of ports  423 . The plurality of electrical contacts  422  may be connected to the monitor module  421  by a power line EL. 
     According to the embodiment, face care may be performed using the sheet  3  containing the cosmetic formulation. 
     At this time, the cosmetic formulation contains moisture, and the moisture decreases as it is used. 
     Accordingly, there is a special technical effect that can check in real time the degree of use of the mask sheet  2  and the progress of the skin care time by measuring a moisture content of the cosmetic formulation contained in the sheet  2 . 
     For example, the contact time sensing device  420  may maintain a voltage on a first electrical contact point of the port  423  and detect a short-circuit between the first electrical contact point and a second electrical contact point of the port, and when the monitor module  421  detects the short-circuit, the contact time sensing device  420  may determine that the cosmetic formulation of the sheet  2  remains sufficiently, and when the short-circuit is not detected, the contact time sensing device  420  may determine in real time that the cosmetic formulation is insufficient. 
     Through this, there is a special technical effect that it is possible to check the degree of use of the sheet  2 , the progress of skin care time, and the like in real time by accurately measuring the moisture content of the cosmetic formulation contained in the sheet  2  through the contact time sensing device  420 . 
     Meanwhile, according to the related art, a light emitting device and a vibration device for skin care are applied in a form of individual devices. 
     However, when the light emitting device and the vibration device are disposed as separate devices, there is a technical contradiction that uniform care may not be implemented over the entire face because the light emitting device may not be disposed in an area where the vibration device is disposed. 
     In order to overcome such a technical contradiction, the skin care apparatus  1  may include an optical vibration composite device  430  disposed on the inner surface  21 . The optical vibration composite device  430  may be connected to the circuit board  99 . 
       FIG. 15  is a view illustrating an optical vibration composite device that may be provided in the skin care apparatus according to the embodiment of the present invention. 
     For example, the optical vibration composite device  430  may include a first electrode layer  431  disposed on the inner surface  21 , a flexible light emitting layer  432  disposed on the first electrode layer  431 , a second electrode layer  433  disposed on the flexible light emitting layer  432 , a flexible ultrasonic layer  434  disposed on the second electrode layer  433 , and a third electrode layer  435  disposed on the flexible ultrasonic layer  434 . 
     The first electrode layer  431  and the third electrode layer  435  may be an anode, and the second electrode layer  433  may be a common cathode. 
     DC power may be applied to the flexible light emitting layer  432 , and AC power may be applied to the flexible ultrasonic layer  434 . 
     The flexible light emitting layer  432  may be an OLED, and the flexible ultrasonic layer  434  may be a flexible piezo coating layer, but the embodiment is not limited thereto. 
     There is a technical effect that it is possible to simultaneously implement light and ultrasonic waves for facial care by providing the optical vibration composite device  430  including the flexible light emitting layer  432  and the flexible ultrasonic layer  434 . 
     In particular, as light and ultrasonic waves may be simultaneously implemented by one composite device  430 , the optical vibration composite device  430  may be densely disposed over the entire face, and accordingly, there is a special technical effect that it is possible to implement very uniform care over the entire face. 
     Meanwhile, according to the related art, when an LED is used in a skin care apparatus, a single wavelength LED is used or an LED capable of emitting individual wavelengths is used even though an LED of a plurality of various wavelengths are used. 
     Accordingly, the number of LEDs that may be mounted is limited in the conventional LED mask, and there was a limitation that an emission wavelength may not be used in various ways according to needs of a user. 
       FIG. 16  is a view illustrating a tunable light emitting module that may be provided in the skin care apparatus according to the embodiment of the present invention. 
     The skin care apparatus  1  may include a wavelength tunable light emitting module  440  as shown in  FIG. 16 . The wavelength tunable light emitting module  440  may include a piezoelectric substrate  441  disposed on a circuit board  315  and a wavelength tunable light emitting device  442  disposed on the piezoelectric substrate  441 . 
     For example, the skin elasticity of the user may be measured by including the piezoelectric sensor  410  including the piezoelectric thin film layer  410   b  disposed on the flexible substrate  410   a  described above. 
     There is a special technical effect that enables skin care by a corresponding LED wavelength after measuring the elasticity of the skin of the user through the piezoelectric sensor  410  before skin care and then selecting an appropriate LED wavelength according to the user. 
     Alternatively, it may be varied to an appropriate wavelength according to a care purpose of the user. For example, in the case of atopic dermatitis care, a wavelength of about 617 nm may be effective, and in the case of acne care, a wavelength of 630 nm may be effective. 
     A wavelength of the wavelength tunable light emitting device  442  may be varied according to a change in the phenomenon of the piezoelectric substrate  441 . 
     For example, a voltage is applied to the piezoelectric substrate  441  to generate mechanical stress, and the mechanical stress may change a wavelength of output light of the wavelength tunable light emitting device  442 , and the piezoelectric substrate  441  may use piezoelectric ceramic, crystal, or the like, but the embodiment is not limited thereto. 
     For example, the piezoelectric substrate  441  includes a first piezoelectric layer (not shown) and a second piezoelectric layer (not shown) disposed on the first piezoelectric layer, and when the second piezoelectric layer expands in the horizontal direction in a state in which the first piezoelectric layer is not deformed, the piezoelectric substrate  441  may be bent in a convex shape toward thereabove. 
     Bending occurs also in the wavelength tunable light emitting device  442  disposed thereon by bending the piezoelectric substrate  441  as described above. 
     In this case, an active layer (not shown) is formed on the wavelength tunable light emitting device  442 , and expansion and deformation occurs in the active layer of the light emitting device  442  as well. The light emitting device  442  generates spontaneous polarization according to a stacked structure of atoms composing a compound semiconductor and piezoelectric polarization due to lattice mismatch between a well layer and a barrier layer when the active layer is grown. 
     When expansion and deformation occur in the active layer due to the convex bending, the polarization effect of the active layer decreases and carriers (electrons and holes) capable of emission recombination increase, and accordingly, there is a characteristic that the emission wavelength shifts to a shorter wavelength as the emission energy increases. 
     On the other hand, bending occurs so that the piezoelectric substrate  441  has a convex shape toward therebelow, the active layer of the light emitting device  442  is contracted and deformed in a plane direction, and the polarization phenomenon inside the active layer is intensified and carriers (electrons and holes) capable of emission recombination are reduced, and accordingly, the emission wavelength may shift in a long wavelength direction as the emission energy decreases. 
     There is a special technical effect that it is possible to perform skin care by a corresponding LED wavelength after measuring the skin elasticity of the user through the piezoelectric sensor  410  before skin care and selecting an appropriate LED wavelength according to the user. 
     Meanwhile, the skin care apparatus  1  may further include a skin thickness measurement device  450 . 
       FIG. 17  is a view illustrating a skin thickness measurement device that may be provided in the skin care apparatus according to the embodiment of the present invention. 
     The skin thickness measurement device  450  may include one or more ultrasonic transducers  453  disposed on the inner body  20  and one or more RF electrodes  451  and  452  disposed on both sides of the ultrasonic transducer  453 . 
     A thickness of an adipose tissue layer of the skin of the user may be accurately measured before skin care, and through this, the wavelength tunable light emitting module  440  is organically combined to control an optimal LED wavelength suitable for the user to perform skin care, and accordingly, there is a technical effect that may maximize the effect of skin care. 
     For example, a through-hole (not shown) may be provided in a part of the inner body  20  or the sheet  2  so that the skin thickness measurement device  450  may be in contact with the skin of the user, but the embodiment is not limited thereto. 
     For example, the ultrasonic transducer  453  of the skin thickness measurement device  450  and one or more RF electrodes may be coupled to a surface of a skin layer of the user with a predetermined level of force. 
     For example, electrical impedance of an adipose tissue segment of the skin of the user disposed between a first electrode  451  and a second electrode  452  may be measured by applying a preset voltage between the first electrode  451  and the second electrode  452  placed on the surface of the skin of the user. 
     For example, a current applied to the first electrode  451  forms a current path along each thickness of the skin layer of the user to flow in the skin tissue, and it is possible to determine the conductivity or impedance of the adipose tissue segment of the user by measuring the total current at an electrode-skin surface coupling point, and through this, a skin thickness of an adipose tissue of the user may be measured. 
     Accordingly, the thickness of the adipose tissue layer of the skin of the user may be accurately measured before skin care, and through this, the wavelength tunable light emitting module  440  is organically combined to control the optimal LED wavelength suitable for the user to perform skin care, and accordingly, there is a technical effect that may maximize the effect of skin care. 
     Meanwhile, the skin care apparatus  1  may further include a linear ultrasound module  460 . 
       FIGS. 18A to 18B  are views illustrating a linear ultrasound module that may be provided in the skin care apparatus according to the embodiment of the present invention. 
     For example, the linear ultrasound module  460  may include a cylindrical conversion element  461  disposed on the inner body  20  and an imaging element  464  disposed on the cylindrical conversion element  461 . 
     For example, as described above, the thickness of the adipose tissue layer of the skin of the user may be accurately measured before skin care. 
     Thereafter, since it is possible to generate linear ultrasonic waves using the linear ultrasound module  460 , there is a special technical effect that may exert an intensive and very optimal care effect in consideration of the skin thickness of the user. 
     For example, referring to  FIG. 18A , the linear ultrasound module  460  may include the cylindrical conversion element  461  and the imaging element  464 , and the cylindrical conversion element  461  may have a concave surface  462  and a convex surface  463 . 
     The cylindrical conversion element  461  may be cut opened to show the release of energy from the concave surface  462  to a treatment area  465  in a user skin surface  468 . 
     Referring to  FIG. 18B , the ultrasound generated by the linear ultrasound module  460  may include a spherical shaped bowl shape having at least one of geometrically concentrated concave surface having a predetermined width (X-axis) and height (Y-axis) in a single point treatment area  465  at a focal depth (Z-axis) under the skin surface  468 . 
     The linear ultrasonic waves may be generated using the linear ultrasound module  460 , and after accurately measuring the skin thickness of the user according to the tenth embodiment, the linear ultrasound module  460  is used in consideration of the skin thickness of the user and a depth of treatment or care, and accordingly, there is a special technical effect that may exert an intensive and very optimal care effect. 
     Meanwhile, the skin care apparatus  1  may further include a composite skin thickness measurement device  470 . 
       FIG. 19  is a view illustrating a composite skin thickness measurement device that may be provided in the skin care apparatus according to the embodiment of the present invention. 
     The composite skin thickness measurement device  470  may include an ultrasound module  471  and a light detection module  472 . 
     The ultrasound module  471  may adopt the skin thickness measurement device  450  described above. 
     In addition, the light detection module  472  may include a light emitting part  472   a  and a light sensor  472   b . In addition, the light emitting part  472   a  may be an LED, and the light sensor  472   b  may be a photodiode. 
     The skin thickness may be measured by detecting a time of light reflected from the skin of the user of light emitted from the light emitting part  472   a.    
     The skin thickness of the user may be accurately measured by the ultrasound module  471  and the light detection module  472 , and through this, the wavelength tunable light emitting module  440  is organically combined to control the optimal LED wavelength suitable for the corresponding user and perform skin care, and accordingly, there is a technical effect that may maximize the effect of skin care. 
     In addition, after accurately measuring the skin thickness of the user using the linear ultrasound module  460  and using the linear ultrasound module  460  in consideration of the skin thickness of the user and treatment or care depth, and accordingly, there is a special technical effect that may exert an intensive and very optimal care effect. 
       FIG. 20  is a control block diagram of a skin care apparatus system including the skin care apparatus according to the embodiment of the present invention. 
     The skin care apparatus system may include the skin care apparatus  1 , the terminal  3 , and the server  5 . Each of the skin care apparatus  1 , the terminal  3 , and the server  5  may transmit and receive a signal to and from each other. The skin care apparatus  1  may transmit and receive a signal to and from the terminal  3  or the server  5  through the communication module  50 . 
     The terminal  3  may include a smart phone, a personal computer (PC), a notebook, and the like. 
     Meanwhile, although only one server  5  is shown in  FIG. 20 , the server  5  may be implemented in plural according to a function to be described later. 
     According to the embodiment of the present invention, the server  5  may acquire environmental information. 
     The environmental information may refer to information related to the atmosphere and may include various information that may affect the human skin. For example, the environmental information may include at least one of an ultraviolet index, a temperature, a humidity, an air pollution level, an air pollution position, and the like. 
     The server  5  may acquire a method of operating the skin care apparatus  1  based on the environmental information. The operation method may refer to operation intensity or an operation time of at least one of the vibration module  30  and the temperature control module  40  provided in the skin care apparatus  1 . 
     For example, the server  5  may acquire an operation method of setting the heat generating intensity of the temperature control module  40  to “weak” when the temperature is 30° C. or more, the heat generating intensity of the temperature control module  40  to “medium” when the temperature is 20° C. or more and less than 30° C., and the heat generating intensity of the temperature control module  40  to “strong” when the temperature is less than 20° C. 
     In addition, the skin care apparatus  1  may have a plurality of care modes, and each of the plurality of care modes may set an operation strength or operation time of the vibration module  30  and an operation strength or operation time of the temperature control module  40  to be different. The server  5  may acquire the operation method of the skin care apparatus  1  by determining any one of the plurality of care modes based on the environmental information. 
     The server  5  may transmit the operation method of the skin care apparatus  1  acquired based on the environmental information to the skin care apparatus  1 . 
     Meanwhile, it has been described that a subject that acquires the operation method of the skin care apparatus  1  according to the environmental information is the server  5 , but it is merely illustrative. That is, after the terminal  3  acquires the environmental information, the terminal  3  may acquire the operation method of the skin care apparatus  1  based on the environmental information to transmit the operation method to the skin care apparatus  1 , or the terminal  3  may acquire the operation method of the skin care apparatus  1  based on the environmental information after the skin care apparatus  1  acquires the environmental information. 
     According to another embodiment of the present invention, the terminal  3  may acquire the environmental information and the user information. Since the environmental information is the same as described above, duplicated descriptions will be omitted. 
     The user information refers to information related to the skin and skin care of the user and may include skin information of the user, a user&#39;s usage history of the skin care apparatus, and the like. For example, the skin information may include oil content, moisture content, skin elasticity, wrinkle information, etc. of the skin of the user&#39;s face, and the usage history of the skin care apparatus may include the number of times the skin care apparatus  1  has been used, cycles, a date of recent use, preferred strength and number of times of the vibration module  30 , and preferred strength and time of the temperature control module  40 . 
     The terminal  3  may acquire the operation method of the skin care apparatus  1  by considering the environmental information and the user information together and transmit the acquired operation method to the skin care apparatus  1 . The operation method has been described above, and thus a duplicated description will be omitted. 
     Meanwhile, it has been described that the subject that acquires the operation method of the skin care apparatus  1  according to the environmental information and the user information is the terminal  3 , but it is merely illustrative. That is, after the server  5  acquires the environmental information and the user information, the server  5  may acquire the operation method of the skin care apparatus  1  to transmit the operation method to the skin care apparatus  1 , or the server  5  may acquire the operation method of the skin care apparatus  1  after the skin care apparatus  1  acquires the environmental information and the user information. 
     According to still another embodiment of the present invention, the skin care apparatus  1  may receive an operation command from the terminal  3 . 
     The terminal  3  may include an input unit (not shown) for receiving an operation input from the user, and the terminal  3  may transmit the operation command to the skin care apparatus  1  so that the skin care apparatus  1  operates according to the operation input received from the input unit (not shown). 
     As an example, the terminal  3  may display a plurality of care modes and receive an input for selecting any one of the plurality of care modes through the input unit (not shown). 
     The above-described descriptions are merely illustrative of the technological spirit of the present invention, and various modifications and variations may be made by those having ordinary skill in the art to which the present invention pertains without departing from the essential characteristics of the present invention. 
     Therefore, the embodiments disclosed in the present invention are not intended to limit the technological spirit of the present invention, but the embodiments are intended to describe, and the spirit and scope of the present invention is not limited by such embodiments. 
     The protection scope of the present invention should be construed by the following claims, and all technological spirits within the equivalent scope thereof should be construed as being included in the scope of right of the present invention.