A mask according to an embodiment comprises: a body having a shape corresponding to a user's face; a first recess disposed on one surface of the body, opposite to the user's face; and a piezoelectric part disposed in the first recess, wherein the first recess has a shape recessed outward from the one surface of the body and is disposed in a region corresponding to at least one of the user's brow region and eye rim regions, and the piezoelectric unit protrudes beyond the one surface toward the user.

TECHNICAL FIELD

An embodiment relates to a mask.

BACKGROUND ART

Human skin may be damaged or contaminated depending on external factors such as environmental pollution, ultraviolet rays, stress, and the like, and wrinkles may occur due to internal factors such as aging, hormonal changes, and the like. Recently, as interest in the skin has increased, various devices for skin treatment, beauty, and anti-aging have been developed.

In detail, a device has been developed, which is capable of applying thermal energy to the skin, for example, a device capable of improving skin elasticity by applying infrared energy. In addition, a device using sound waves or light rays has been developed in order to effectively inject cosmetics or drugs into the skin. For example, a device has been developed, which is capable of forming a path through which cosmetics or drugs are injected into the skin using sonophoresis and laserporation. In addition, a device using electric propulsion force has been developed in order to effectively inject cosmetics or drugs into the skin. For example, a device has been developed, which is capable of effectively injecting ionic substances contained in cosmetics or drugs into the skin using iontophoresis, electroporation, and electroosmosis. That is, various devices have been developed, which is capable of caring or treating a user's skin by providing light energy, microcurrent, vibration, or the like to the skin.

In general, the above-described devices may be provided in a form of a patch detachable to the skin, and the devices are attached to a specific skin region to care or treat the skin of the attached region. In addition, the above-described devices are provided in a form of a mask pack disposed to cover the entire user's face to care or treat the facial skin.

However, since the devices are formed to have a predetermined thickness, it may be difficult to effectively adhere to the user's skin.

In addition, the devices are difficult to effectively adhere to the user's skin in curved regions such as both cheeks, nose, and the like. In detail, it may be difficult to effectively adhere to the user's skin due to materials and variable characteristics of the device. Accordingly, the device may be operated in a state in which the device is not completely adhered to the user's skin, and the device may be separated from the user's skin due to the user's movement or vibration of the device during the operation thereof. Accordingly, since ultrasonic energy is not provided to the user's skin, a care or treatment effect using the device may be insignificant.

In addition, there is a problem that an internal electric wiring is damaged due to the deformation of the device that occurs while the device is adhered to the user's skin. In particular, there is a problem that an electric wiring of the device in a region corresponding to a relatively curved skin is disconnected due to deformation of the device that occurs when the device is worn.

In addition, there is a problem that the device is deformed while the device is adhered to the user's skin. Accordingly, there is a problem that impedance characteristics of ultrasonic waves generated from a piezoelectric element of the device are deteriorated. Accordingly, the device has a problem that it is difficult to effectively transmit ultrasonic energy to the user's skin and it is difficult to evenly transmit the ultrasonic energy to the entire skin region.

Therefore, a new mask capable of solving the above-described problem is required.

DISCLOSURE

Technical Problem

An embodiment is to provide a mask that has variability and improved reliability.

In addition, an embodiment is to provide a mask capable of effectively adhering to a user's skin.

In addition, an embodiment is to provide a mask capable of providing uniform ultrasonic energy to a user's skin.

In addition, an embodiment is to provide a mask capable of effectively caring or treating the user's skin in a short time.

Technical Solution

A mask according to an embodiment includes a body having a shape corresponding to a user's face, a first recess disposed on one surface of the body facing the user's face, and a piezoelectric part disposed in the first recess, wherein the first recess has a concave shape from one surface of the body in an outward direction and is disposed in a region corresponding to at least one of the user's brow region and eye rim regions, and the piezoelectric part protrudes further toward the user than one surface of the body.

In addition, a mask according to an embodiment includes a body having a second support member, a third support member on the second support member, and a first support member on the third support member, a first recess disposed on the first support member, and a piezoelectric part disposed in the first recess, wherein the first recess has a concave shape from the first support member toward the second support member, and the third support member includes a material different from the first and second support members, wherein the piezoelectric part includes a first base layer disposed on the second support member, a first wiring disposed on the first base layer, a plurality of piezoelectric elements disposed on the first wiring, a second wiring disposed on the plurality of piezoelectric elements, a second base layer disposed on the second wiring, and a protective layer disposed between the first and second base layers and surrounding the first wiring, the second wiring, and the plurality of piezoelectric elements, wherein an upper surface of the second base layer is disposed above an upper surface of the first support member.

Advantageous Effects

A mask according to an embodiment includes an elastic material and may be elastically deformed depending on a shape of a user's skin. Accordingly, when the user wears the mask, the mask may be deformed into a shape corresponding to the user's skin, so that the mask may be effectively adhered to the skin of the user.

In addition, the mask according to the embodiment may include a piezoelectric part, and the piezoelectric parts may be disposed in a position corresponding to a region where wrinkles are relatively easy to occur, a region where a stratum corneum is easily formed, and a region where effective supply of cosmetics or drugs is required of the user's skin. As an example, the piezoelectric part may be disposed in a region corresponding to the user's brow region and both eye rim regions to provide ultrasonic energy to the region. Accordingly, the mask may crack the stratum corneum of the region to form fine perforations and effectively provide drugs or cosmetics between the piezoelectric part and the skin into the skin.

In addition, the piezoelectric part may include a plurality of piezoelectric elements and may be elastically deformed depending on the shape of the user's skin. Accordingly, the piezoelectric part may be effectively adhered to the user's skin to generate uniform ultrasonic energy on the user's skin. In particular, the plurality of piezoelectric elements may be disposed at different intervals from each other depending on a face shape of the user. For example, the piezoelectric elements disposed in a relatively curved region such as cheekbones, cheeks, and the like and a planar region such as brow of surface regions of the user's skin may be disposed at different intervals from each other. Accordingly, the mask according to the embodiment may provide uniform ultrasound energy to various skin shapes without being limited to the skin type.

MODES OF THE INVENTION

However, the spirit and scope of the present invention is not limited to a part of the embodiments described, and may be implemented in various other forms, and within the spirit and scope of the present invention, one or more of the elements of the embodiments may be selectively combined and replaced.

In addition, unless expressly otherwise defined and described, the terms used in the embodiments of the present invention (including technical and scientific terms may be construed the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms such as those defined in commonly used dictionaries may be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art.

In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular forms may In addition include the plural forms unless In detail stated in the phrase, and may include at least one of all combinations that may be combined in A, B, and C when described in “at least one (or more) of A (and), B. and C”.

In addition, in describing the elements of the embodiments of the present invention, the terms such as first, second, A, B, (A, and (b) may be used. These terms are only used to distinguish the elements from other elements, and the terms are not limited to the essence, order, or order of the elements. Further, when an element is described as being “connected”, “coupled”, or “connected” to another element, it may include not only when the element is directly “connected” to, “coupled” to, or “connected” to other elements, but also when the element is “connected”, “coupled”, or “connected” by another element between the element and other elements.

Further, when described as being formed or disposed “on (over)” or “under (below)” of each element, the “on (over)” or “under (below)” may include not only when two elements are directly connected to each other, but also when one or more other elements are formed or disposed between two elements. Furthermore, when expressed as “on (over)” or “under (below)”, it may include not only the upper direction but also the lower direction based on one element.

In addition, before describing the embodiments of the present invention, a first direction may refer to an x-axis direction shown in the drawings, and a second direction may be a different direction from the first direction. As an example, the second direction may refer to a y-axis direction shown in the drawing in a direction perpendicular to the first direction. In addition, a horizontal direction may refer to the first and second directions, and a vertical direction may refer to a direction perpendicular to at least one of the first and second directions. For example, the horizontal direction may refer to the x-axis and y-axis directions of the drawing, and the vertical direction may be a z-axis direction of the drawing and a direction perpendicular to the x-axis and v-axis directions.

FIG. 1is a perspective view of a mask according to an embodiment,FIG. 2is a front view of the mask according to the embodiment, andFIG. 3is a rear view of the mask according to the embodiment.

Referring toFIGS. 1 to 3, a mask2000according to an embodiment may have a shape corresponding to a human face. The mask2000according to the embodiment may be provided in a predetermined size capable of covering a part or all of a user's face. The mask2000may include one surface facing the user's skin and the other surface opposite to the one surface and facing the outside, and the one surface of the mask2000may be made of a material that is harmless to the human body, so that it is harmless despite being in contact with the user's skin for a long time.

The mask2000may include a body2001having a shape corresponding to the user's face. The body2001may have a shape corresponding to the user's face and include an opening2010and a bending portion2020.

The opening2010may be formed in a region corresponding to the user's eyes. The opening2010may be a region passing through one surface and the other surface of the mask2000. At least one opening2010may be formed on the body2001. As an example, the body2001may include one opening2010. In this case, the opening2010may be formed in a region corresponding to both eyes and a part of the nose of the user. As another example, the body2001may include a plurality of openings2010. In this case, the opening2010may be each formed in the left eye and the right eye of the user. Accordingly, w % ben the user wears the mask2000, a view may be secured through the opening2010.

The bending portion2020may be formed in a region corresponding to the user's nose. The bending portion2020may have a shape corresponding to the user's nose. As an example, the bending portion2020may have a shape bent from one surface of the mask2000toward the other surface, for example, a concave shape for mounting the user's nose. Accordingly, when the user wears the mask2000, the mask2000may be mounted and fixed on the user's nose.

The mask2000may include an extension portion2050that extends from at least one end of the body2001toward the back of the user's head. The extension portion2050may be integrally formed with the body2001. In addition, the extension portion2050may be formed separately from the body2001and may be coupled by a fastening member, but the embodiment is not limited thereto. In addition, the extension portion2050may include the same material as the body2001, but the embodiment is not limited thereto.

As an example, the extension portion2050may include a first extension portion and a second extension portion that extend from both ends of the body2001toward the back of the user's head. The first and second extension portions may extend toward each of the user's left and right ears to overlap in a region behind the user's head.

In this case, a fixing member2070may be disposed on the extension portion2050. In detail, the fixing member2070for fixing the extension portion2050may be disposed on the extension portion2050. For example, the fixing member2070may be each disposed on one surface of the first extension portion facing the second extension portion and one surface of the second extension portion facing the first extension portion. As an example, the fixing member2070may include a Velcro, a hook, a button, a pin, or the like. However, the embodiment is not limited thereto, and the fixing member2070may include various fixing members capable of fixing the first and second extension portions. The first and second extension portions may be fixed to each other by the fixing member2070. Accordingly, when the user wears the mask2000, the mask2000may be disposed on and fixed on the set user's face and may be effectively adhered to the user's skin.

As another example, the first and second extensions may extend to a region adjacent to the user's ears. That is, the user may wear the mask2000like glasses. Therefore, the user may more easily wear and fix the mask and may easily take off the mask2000after use.

As still another example, the extension portion2050may extend from one end of the body2001toward the back of the users head. In detail, the extension portion2050may extend from one end of the body2001toward the back of the user's head and may be connected to the other end of the body2001after wrapping the back of the user's head. Accordingly, when the user wears the mask2000, the mask2000may be disposed on and fixed on the set user's face and may be effectively adhered to the user's skin. In addition, the body2001may include a plurality of support members2100facing the users skin. A structure of the body2001will be described in detail with reference toFIGS. 12 to 15described later.

The mask2000according to the embodiment may include a piezoelectric region2030. The piezoelectric region2030may be a region corresponding to a region of the user's skin where wrinkles are likely to occur. For example, the piezoelectric region2030of the mask2000may include a first region2031defined as a region corresponding to the user's brow region, a second region2033defined as a region corresponding to the user's right eye rim, and a third region2035defined as a region corresponding to the user's left eye rim.

The piezoelectric part1000may be disposed on the body2001. In detail, the piezoelectric part1000may be disposed on one surface of the mask200X) facing the user's skin, for example, on one surface of the body2001.

The piezoelectric part1000may be disposed in the region corresponding to the region of the user's skin where wrinkles are likely to occur. For example, the piezoelectric part1000may be disposed on the piezoelectric region2030of the mask2000. The piezoelectric part1000may be disposed on at least one of the first region2031, the second region2033, and the third region2035. As an example, the piezoelectric part1000may be disposed on the second region2033and the third region2035to provide ultrasonic energy to both eye rim regions of the user. As another example, the piezoelectric part1000may be formed on all of the first to third regions2031,2033, and2035. Accordingly, it is possible to effectively provide ultrasonic energy to the user's eye rim regions and brow region.

That is, the mask2000according to the embodiment may be disposed on the user's skin, for example, on the region where wrinkles are likely to occur to provide ultrasonic energy to the skin. Accordingly, cracks may be formed in a stratum corneum of the user's skin to form a fine perforation, and drugs or cosmetics between the mask2000and the user's skin may be effectively provided to the user.

In addition, the piezoelectric part1000may be disposed on the support member2100of the body2001. An arrangement relationship between the body2001and the piezoelectric part1000will be described in detail with reference toFIGS. 12 to 15described later.

FIG. 4is an exploded perspective view of a piezoelectric part according to an embodiment, andFIG. 5is a top view of the piezoelectric part according to the embodiment. In addition,FIG. 6is another top view of the piezoelectric part according to the embodiment,FIG. 7is a cross-sectional view showing a cross-section A-A′ ofFIG. 6, andFIG. 8is an enlarged view of region A1ofFIG. 7.

The piezoelectric part1000will be described in detail with reference toFIGS. 4 to 8. The piezoelectric part1000may include a first base layer110, a first wiring200, a piezoelectric element400, a second wiring300, and a second base layer120. In detail, the piezoelectric part1000may include the first wiring200, the piezoelectric element400, the second wiring300, and the second base layer120sequentially disposed on the first base layer110.

The first base layer110may include a material harmless to the human body. In addition, the first base layer110may include a material having softness and elasticity. For example, the first base layer110may include at least one material of silicone, a thermoplastic resin, a thermoplastic silicone resin, a thermoplastic elastomer, a polyurethane elastomer, an ethylene vinyl acetate (EVA), a polyvinyl chloride (PVC) in which a harmless plasticizer and a stabilizer are added. Preferably, the first base layer110may include a silicone elastomer that is relatively light, may minimize irritation upon contact with the user's skin, and has a predetermined elasticity.

The first base layer110may reflect wavelengths emitted from the piezoelectric element400to be described later in a direction of one surface of the mask2000. In detail, the first base layer110may reflect the wavelength of the piezoelectric element400toward one surface of the piezoelectric part1000facing the user's skin. That is, the first base layer110may be a reflective layer.

To this end, a thickness t1of the first base layer110may be equal to or smaller than a thickness t2of the second base layer120to be described later. In detail, the thickness t1of the first base layer110may be equal to or smaller than the thickness t2of the second base layer120in order to reflect the wavelengths emitted from the piezoelectric element400toward the first substrate110to the first base layer110. That is, the second base layer120may be a base layer facing the user's skin, and the first base layer110may be a base layer disposed in a region opposite to the second base layer120.

The thickness t1of the first base layer110may be about 50 μm to about 10 mm. When the thickness t1of the first base layer510is less than about 50 μm, the thickness t1of the first base layer510is relatively small, so that components disposed on the first base layer110may not be effectively protected. In detail, when the piezoelectric part1000and the mask2000are elastically deformed and the first base layer110is elastically deformed, the wirings200and300and the piezoelectric element400on the first base layer110may not be effectively protected.

In addition, when the thickness t1of the first base layer110exceeds about 10 mm, a thickness of the piezoelectric part1000and a thickness of the entire mask2000may be increased, and most of the wavelengths emitted from the piezoelectric element400toward the first substrate110pass through the first base layer110, so that an amount of reflection in the direction of one surface of the mask2000may be small.

In addition, when the thickness t1of the first base layer110exceeds about 10 mm, a required thickness of the second base layer120may be increased for reflection in the direction of one surface of the mask2000, and a frequency domain ban of the wavelengths generated from the piezoelectric element400is high for reflection, and thus it may not be suitable for use in the mask2000.

In addition, when the thickness t1of the first base layer110exceeds about 10 mm, elastic deformation characteristics of the piezoelectric part1000and elastic deformation characteristics of the mask2000may be deteriorated. Accordingly, the piezoelectric part1000and the mask2000may not be elastically deformed effectively in a form corresponding to the user's skin, and thus adhesion to the skin may be deteriorated.

Therefore, it is preferable that the thickness t1of the first base layer110satisfies the above-described range in order to prevent the above-described problems. More preferably, the thickness t1of the first base layer110may be about 100 μm to about 1000 μm. That is, it is preferable that the first base layer110has a thickness range of about 100 μm to about 1000 μm in consideration of reliability, reflective properties, variability, thickness, weight, and ultrasonic impedance characteristics of the piezoelectric part1000.

In addition, although not shown in the drawing, the first base layer110may have grooves, pores, or the like formed therein in order to effectively reflect the wavelengths generated from the piezoelectric element400. For example, the grooves and pores may be disposed in a region overlapping the piezoelectric element400for effective reflection, but the embodiment is not limited thereto.

The first wiring200may be disposed on the first base layer110. The first wiring200may be disposed on one surface of the first base layer110facing the piezoelectric element400. The first wiring200may extend in a first direction (x-axis direction) on the first base layer110. The first wiring200may be in direct contact with one surface of the first base layer110. The first wiring200may be formed on one surface of the first base layer110by a process such as deposition, printing, bonding, or the like. The first wiring200may be electrically connected to the piezoelectric element400.

The first wiring200may include a conductive material. As an example, the first wiring200may include at least one metal of aluminum (Al), copper (Cu), silver (Ag), gold (Au), chromium (Cr), nickel (Ni), molybdenum (Mo), titanium (Ti), and alloys thereof. In addition, the first wiring200may include a non-metal such as carbon, and the like, and may include a conductive elastic body.

The first wiring200may have a single layer or a multiple layer structure. As an example, the first wiring200may have a single layer structure including one selected from the above-described materials. In addition, the first wiring200may have a multiple layer structure including a metal material selected from the above-described materials and the conductive elastic body.

The first wiring200may include a plurality of first sub-wirings201disposed on the first base layer110. Each of the plurality of first sub-wirings201may extend in a first direction and may be disposed to be spaced apart from each other in a second direction different from the first direction. The plurality of first sub-wirings201may be electrically connected to each other. Here, the second direction may be a direction different from the first direction and a direction perpendicular to the first direction, but the embodiment is not limited thereto.

A thickness of the first sub-wiring201may be about 2 μm to about 50 μm. In detail, the thickness of the first sub-wiring201may be about 2 μm to about 40 μm. When the thickness of the first sub-wiring201is less than about 2 μm, electrical characteristics may be deteriorated, and it may be difficult to form uniformly. In addition, when the thickness of the first sub-wiring201exceeds about 50 μm, the overall thickness of the piezoelectric part1000and the overall thickness of the mask2000may be increased, and a manufacturing time of the first wiring210may be increased. In addition, the thickness of the first sub-wiring201is too thick, and thus stretchable characteristics may be deteriorated. Preferably, the thickness of the first sub-wiring201may be about 5 μm to about 35 μm or less in consideration of stretchable characteristics in the horizontal direction, reliability, and process efficiency.

In addition, a line width of the first sub-wiring201may be about 50 μm to about 500 μm. In detail, the line width of the first sub-wiring201may be about 100 μm to about 450 μm. The line width of the first sub-wiring201may be greater than the thickness of the first sub-wiring201. When the line width of the first sub-wiring201is less than about 50 μm, the reliability may be deteriorated, and when the line width of the first sub-wiring201exceeds about 500 μm, an elongation may be decreased and the stretchable characteristics may be deteriorated. Preferably, the line width of the first sub-wiring201may be about 100 μm to about 400 μm in consideration of the stretchable characteristics.

The first wiring200may include a first connection portion210and a first extension portion220. For example, one of the first sub-wirings201may include the first connection portion210and the first extension portion220connected to the first connection portion210.

The first connection portion210may be disposed in a region corresponding to a lower surface of the piezoelectric element400. In detail, the first connection portion210may be disposed in a region overlapping the lower surface of the piezoelectric element400in the vertical direction. The first connection portion210may face the lower surface of the piezoelectric element400. The first connection portion210may be provided in a number corresponding to the piezoelectric element400.

The first connection portion210may have a shape corresponding to the lower surface of the piezoelectric element400. The first connection portion210may have a width corresponding to the lower surface of the piezoelectric element400. As an example, a width of the first connection portion210in the horizontal direction may be equal to or smaller than a width of the lower surface of the piezoelectric element400in the horizontal direction. In detail, the width of the first connection portion210in the horizontal direction may be about 50% to about 100% of the width of the lower surface of the piezoelectric element400in the horizontal direction. When the width of the first connection portion210in the horizontal direction is less than about 50%, electrical characteristics between the first wiring200and the piezoelectric element400may be deteriorated. In addition, when the width of the first connection portion210in the horizontal direction is greater than the width of the lower surface of the piezoelectric element400, the transmittance of ultrasonic energy may be deteriorated. Therefore, it is preferable that the width of the first connection portion210in the horizontal direction satisfies the above-described range.

The first extension portion220may extend in the first direction from the first connection portion210. The first extension portion220may be disposed between a plurality of first connection portions210. In detail, the first extension portion220may be disposed between the first connection portions210spaced apart in the first direction. That is, the first extension portion220may connect between adjacent first connection portions210.

The first wiring200may have various shapes. For example, when viewed in a plane, each of the plurality of first sub-wirings201may extend in the first direction in a linear shape as shown inFIG. 5. In detail, the plurality of first sub-wirings201may be spaced apart from the adjacent first sub-wirings201in the second direction at equivalent intervals and may extend in the first direction in the linear shape. That is, the first extension portion220of the first wiring200may have the linear shape extending in the first direction.

Alternatively, when viewed in a plane, each of the plurality of first sub-wirings201may extend in the first direction in a curved shape as shown inFIG. 6. For example, each of the plurality of first sub-wirings201may be provided in a form in which a wavy pattern is repeated. That is, the first extension portion220of the first wiring200may have the curved shape extending in the first direction.

In this case, the first extension portion220may have a curvature pattern of about 3R to about 20R (mm). Accordingly, when the piezoelectric part1000and the mask2000are stretched or contracted in one direction, the first wiring200may have the stretchable characteristics and may not be cut. Preferably, the first extension portion220may have a curvature pattern of about 5R to about 15R (mm). In addition, the first extension portion220may have an elongation of about 10% to about 50%. Accordingly, the first wiring200may have more improved stretchable characteristics, thereby improving reliability and improving adhesion to the user's skin.

Still alternatively, although not shown in the drawing, the first extension portion220may have a shape in which a pattern in which a straight line and a curve extending in the first direction are mixed is repeated. For example, when viewed from a plane, the first extension portion220positioned in a region overlapping a relatively curved region (cheekbones, cheeks, a region between eyes and temples, etc.) of the user's face may be provided in the curved shape, and the first extension portion220positioned in a region overlapping a relatively planar region (brow, etc.) may be provided in the linear shape. Accordingly, when the user wears the mask2000, it is possible to prevent the first wiring200from being damaged due to deformation of the piezoelectric part1000. In addition, the first extension portion220may be provided in a form in which the straight line and the curve are mixed to maintain electrical characteristics and reduce a ratio occupied by the first wiring200. Therefore, the embodiment may reduce manufacturing costs of the first wiring200and minimize the loss of ultrasonic energy emitted from the piezoelectric element400.

The piezoelectric element400may be disposed on the first base layer110. The piezoelectric element400may be disposed on the first wiring200. In detail, the piezoelectric element400may be disposed on the first extension portion220of the first wiring200to be electrically connected to the first wiring200.

The piezoelectric element400may be disposed on the first wiring200in plural. The plurality of piezoelectric elements400may be disposed to be spaced apart from each other on the first sub-wiring201. For example, the plurality of piezoelectric elements400may be disposed on the first connection portion210on the first sub-wiring201. In detail, one piezoelectric element400may be disposed on one first connection portion210. A center of the lower surface of the piezoelectric element400may overlap the first sub-wiring201in the vertical direction. In detail, the center of the lower surface of the piezoelectric element400may overlap the first connection portion210. In more detail, the center of the lower surface of the piezoelectric element400may overlap a center of the first connection portion210.

The plurality of piezoelectric elements400may be spaced apart at equivalent intervals on the first sub-wiring201. For example, the plurality of piezoelectric elements400disposed on one first sub-wiring201may be disposed at equivalent intervals based on the first direction. In addition, the piezoelectric elements400disposed on the adjacent first sub-wirings201may be disposed at equivalent intervals based on the second direction. Accordingly, a virtual line connecting centers of the adjacent plurality of piezoelectric elements400in the first direction and the second direction may have a mesh shape.

In addition, a piezoelectric element400disposed on one first sub-wiring201may overlap or not overlap a piezoelectric element400disposed on the first sub-wiring201closest to the one first sub-wiring201in the second direction. As an example, when viewed in a plane, the piezoelectric element400may be disposed in a zigzag shape on the adjacent first sub-wiring201

In addition, a distance between some of the piezoelectric elements400may be disposed at equivalent intervals, and the remaining piezoelectric elements400may not be disposed at equivalent intervals. For example, the distance between the piezoelectric elements400may be disposed at equivalent intervals in a region overlapping a relatively planar region of a surface of the user's face. However, the distance between the piezoelectric elements400may not be disposed at equivalent intervals in a region overlapping a relatively curved skin region. That is, the distance between the piezoelectric elements400may be relatively narrow or large depending on the degree of curvature of the skin surface. As an example, the distance between the piezoelectric elements400of the region overlapping the curved region such as the cheekbones, the cheeks, the region between eyes and temples, etc. of the user, may be relatively narrow. Accordingly, the piezoelectric part1000according to the embodiment may effectively provide ultrasonic energy even to the curved skin.

The piezoelectric element400may be disposed on the entire region of the piezoelectric part1000to generate evenly the ultrasonic energy. For example, the piezoelectric element400may generate ultrasonic energy of about 1 MHz or less by an applied current. In detail, the piezoelectric element400may generate ultrasonic energy of about 10 KHz to about 1 MHz. In more detail, the piezoelectric element400may generate ultrasonic energy of about 50 KHz to about 800 KHz. The ultrasonic energy generated by the piezoelectric element400may move in a direction of one surface of the piezoelectric part1000, for example, in a direction of one surface of the mask2000and may be transmitted to the user's skin to massage the user's skin.

A thickness of the piezoelectric element400may be about 1500 μm or less. In detail, the thickness of the piezoelectric element400may be about 1200 μm or less. Preferably, the thickness of the piezoelectric element400may be about 1000 μm or less. It is preferable that the thickness of the piezoelectric element400satisfies the above-described range in consideration of the overall thickness and variable characteristics of the piezoelectric part1000.

The piezoelectric element400may have various shapes. For example, the piezoelectric element400may have a polygonal column shape in which lower and upper surfaces are polygonal, and the lower and upper surfaces may have a circular column shape. In addition, the piezoelectric element400may have a pillar shape in which one surface of the lower and upper surfaces is a polygonal and the other surface is circular. As an example, a region of at least one area of the lower surface and the upper surface of the piezoelectric element400may be about 100 mm2or less.

As described above, the piezoelectric element400may have various pillar shapes, and intensity and an oscillation direction of ultrasonic energy generated according to the pillar shape may be controlled. In addition, the intensity of ultrasonic energy transmitted to the user's skin may be adjusted according to a size, arrangement interval, arrangement density, and the like of the piezoelectric element400.

The piezoelectric element400may generate various waves. As an example, the piezoelectric element400may generate at least one wave of a transverse wave in which a traveling direction of wave and a vibration direction of medium are perpendicular, and a longitudinal wave in which the traveling direction of wave and the vibration direction of medium are the same. In addition, the piezoelectric element400may multiple-resonate. For example, the piezoelectric element400may include at least one via hole and may multiple-resonate by the formed via holes. In this case, an upper area of the via holes may be about 10% to about 45% of an area of an upper surface of the piezoelectric element400for multiple resonance. In addition, when the piezoelectric element400multiple-resonates by the via holes, the number of multiple resonant frequency regions may correspond to the number of the via holes. That is, the piezoelectric element400may emit wavelengths of various frequency ranges, for example, ultrasonic energy, as the number of the via holes increases in a set number range of via holes.

The second base layer120may be disposed on the piezoelectric element400. The second base layer120is a portion that may be in contact with the skin while facing the user's skin, and may include a material harmless to the human body. In addition, the second base layer120may include a material having softness and elasticity. For example, the second base layer120may include at least one material of silicone, a thermoplastic resin, a thermoplastic silicone resin, a thermoplastic elastomer, a polyurethane elastomer, an ethylene vinyl acetate (EVA), a polyvinyl chloride (PVC) in which a harmless plasticizer and a stabilizer are added. Preferably, the second base layer120may include a silicone elastomer that is relatively light, may minimize irritation upon contact with the user's skin, and has a predetermined elasticity. The first base layer110may be provided with the same material as the second base layer120.

The second base layer120may pass through the wavelengths emitted from the piezoelectric element400in the direction of one surface of the piezoelectric part1000to transmit the wavelengths to the user's skin. That is, the second base layer120is transmission layer and may be a matching layer.

To this end, the thickness t2of the second base layer120may vary depending on an impedance of the second base layer120and a driving frequency of the piezoelectric element300. In addition, the thickness t2of the second base layer120may be equal to or greater than the thickness of the first base layer110.

As an example, when the driving frequency of the piezoelectric element400is about 1 MHz or less, the thickness t2of the second base layer120may be about 50 μm to about 1 mm. When the thickness t2of the second base layer120is less than about 50 μm, the thickness t2of the second base layer120is relatively small, so that components disposed on the second base layer120may not be effectively protected. In detail, when the mask2000is elastically deformed and the second base layer120is elastically deformed, the wirings200and300and the piezoelectric element400on the second base layer120may not be effectively protected.

In addition, when the thickness t2of the second base layer120exceeds about 10 mm, the overall thickness of the piezoelectric part1000and the overall thickness of the mask2000may be increased. Accordingly, the elastic deformation characteristics of the piezoelectric part1000may be deteriorated, and the mask1000may not be elastically deformed effectively in a form corresponding to the user's skin, and thus adhesion to the skin may be deteriorated.

Therefore, it is preferable that the thickness t2of the second base layer120satisfies the above-described range in order to effectively pass through the wavelengths emitted from the piezoelectric element400. Preferably, the thickness t2of the second base layer120may have a thickness range of 100 μm to about 1000 μm in consideration of reliability, transmission characteristics, variability, thickness, weight, and ultrasonic impedance characteristics of the mask2000to be manufactured.

That is, some of the ultrasonic energy emitted from the piezoelectric element400according to the embodiment may be emitted toward the second base layer120and pass through the second base layer120to be transmitted to the user's skin. In addition, another part of the ultrasonic energy may be emitted toward the first base layer110and reflected toward the second base layer120by the first base layer110. Thereafter, the reflected ultrasonic energy may pass through the second base layer120to be transferred to the user's skin.

The second wiring300may be disposed on the second base layer120. The second wiring300may be disposed on one surface of the second base layer120facing the piezoelectric element400. The second wiring300may extend in a different direction from the first wiring200on the second base layer120. For example, the second wiring300may extend in a second direction (y-axis direction) perpendicular to the first direction. The second wiring300may be in direct contact with one surface of the second base layer120. The second wiring300may be formed on one surface of the second base layer120by a process such as deposition, printing, bonding, or the like. The second wiring300may be electrically connected to the piezoelectric element400.

The second wiring300may include a conductive material. As an example, the second wiring300may include at least one metal of aluminum (Al), copper (Cu), silver (Ag), gold (Au), chromium (Cr), nickel (Ni), molybdenum (Mo), titanium (Ti), and alloys thereof. In addition, the second wiring300may include a non-metal such as carbon, and the like, and may include a conductive elastic body. The second wiring300may include the same material as the first wiring200.

The second wiring300may have a single layer or a multiple layer structure. As an example, the second wiring300may have a single layer structure including one selected from the above-described materials. In addition, the second wiring300may have a multiple layer structure including a metal selected from the above-described materials and the conductive elastic body. The second wiring300may include the same material as the first wiring200.

The second wiring300may include a plurality of second sub-wirings301disposed on the second base layer120. Each of the plurality of second sub-wirings301may extend in the second direction and may be disposed to be spaced apart from each other in the first direction. The plurality of second sub-wirings301may be electrically connected to each other.

A thickness of the second sub-wiring301may be about 2 μm to about 50 μm. In detail, the thickness of the second sub-wiring301may be about 2 μm to about 40 μm. When the thickness of the second sub-wiring301is less than about 2 μm, electrical characteristics may be deteriorated, and it may be difficult to form uniformly. In addition, when the thickness of the second sub-wiring301exceeds about 50 μm, the overall thickness of the piezoelectric part1000and the overall thickness of the mask2000may be increased, and a manufacturing time of the second wire300may be increased. In addition, the thickness of the second sub-wiring301is too thick, and thus stretchable characteristics may be deteriorated. Preferably, the thickness of the second sub-wiring301may be about 5 μm to about 35 μm or less in consideration of stretchable characteristics in the horizontal direction, reliability, and process efficiency.

In addition, a line width of the second sub-wiring301may be about 50 μm to about 500 μm. In detail, the line width of the second sub-wiring301may be about 100 μm to about 450 μm. The line width of the second sub-wiring301may be greater than the thickness of the second sub-wiring301. When the line width of the second sub-wiring301is less than about 50 μm, the reliability may be degraded, and when the line width of the second sub-wiring301exceeds about 500 μm, an elongation may be decreased and the stretchable characteristics may be deteriorated. Preferably, the line width of the second sub-wiring301may be about 100 μm to about 400 μm in consideration of the stretchable characteristics.

The second wiring300may include a second connection portion310and a second extension portion320. For example, one of the second sub-wirings301may include the second connection portion310and the second extension portion320connected to the second connection portion310.

The second connection portion310may be disposed in a region corresponding to an upper surface of the piezoelectric element400. In detail, the second connection portion310may be disposed in a region overlapping the upper surface of the piezoelectric element400in the vertical direction. The second connection portion310may face the upper surface of the piezoelectric element400. The second connection portion310may be provided in a number corresponding to the piezoelectric element400.

The second connection portion310may have a shape corresponding to the upper surface of the piezoelectric element400. The second connection portion310may have a width corresponding to the upper surface of the piezoelectric element400. As an example, a width of the second connection portion310in the horizontal direction may be equal to or smaller than a width of the upper surface of the piezoelectric element400in the horizontal direction. In detail, the width of the second connection portion310in the horizontal direction may be about 50% to about 100% of the width of the upper surface of the piezoelectric element400in the horizontal direction. When the width of the second connection portion310in the horizontal direction is less than about 50%, electrical characteristics between the second wiring300and the piezoelectric element400may be deteriorated. In addition, when the width of the second connection portion310in the horizontal direction is greater than the width of the lower surface of the piezoelectric element400, the transmittance of ultrasonic energy may be deteriorated. Therefore, it is preferable that the width of the second connection portion310in the horizontal direction satisfies the above-described range.

The second extension portion320may extend in the second direction from the second connection portion310. The second extension portion320may be disposed between a plurality of second connection portions310. In detail, the second extension portion320may be disposed between the second connection portions310spaced apart in the second direction. That is, the second extension portion320may connect between adjacent second connection portions310.

The second wiring300may have various shapes. For example, when viewed in a plane, each of the plurality of second sub-wirings301may extend in the second direction in the linear shape as shown inFIG. 5. In detail, the plurality of second sub-wirings301may be spaced apart from the adjacent second sub-wirings301in the first direction at equivalent intervals and may extend in the second direction in the linear shape. That is, the second extension portion320of the second wiring300may have the linear shape extending in the second direction.

Alternatively, when viewed in a plane, each of the plurality of second sub-wirings301may extend in the second direction in the curved shape as shown inFIG. 6. For example, each of the plurality of second sub-wirings301may be provided in a form in which a wavy pattern is repeated. That is, the second extension portion320of the second wiring300may have the curved shape extending in the second direction.

In this case, the second extension portion320may have a curvature pattern of about 3R to about 20R (mm). Accordingly, when the piezoelectric part1000and the mask2000are stretched or contracted in one direction, the second wiring300may have the stretchable characteristics and may not be cut. Preferably, the second extension portion320may have a curvature pattern of about 5R to about 15R (mm). In addition, the second extension portion320may have an elongation of about 10% to about 50%. Accordingly, the second wiring300may have more improved stretchable characteristics, thereby improving reliability and improving adhesion to the user's skin.

Still alternatively, although not shown in the drawing, the second extension portion320may have a shape in which a pattern in which a straight line and a curve extending in the first direction are mixed is repeated. For example, when viewed from a plane, the second extension portion320positioned in a region overlapping a relatively curved region (cheekbones, cheeks, a region between eyes and temples, etc.) of the user's face may be provided in the curved shape, and the second extension portion320positioned in a region overlapping a relatively planar region (brow, etc.) may be provided in the linear shape. Accordingly, when the user wears the mask2000, it is possible to prevent the second wiring300from being damaged due to deformation of the piezoelectric part1000. In addition, the second extension portion320may be provided in a form in which the straight line and the curve are mixed to maintain electrical characteristics and reduce a ratio occupied by the second wiring300. Therefore, the embodiment may reduce manufacturing costs of the second wiring300and minimize the loss of ultrasonic energy emitted from the piezoelectric element400.

The first wiring200and the second wiring300may be disposed to cross each other. In detail, when viewed in a plane as shown inFIGS. 5 and 6, the first sub-wiring201and the second sub-wiring301may be disposed to cross each other in a mesh shape, and, an open region in which the wirings200and300are not disposed may be formed between the sub-wirings201and301.

The piezoelectric element400may be disposed on a region where the first wiring200and the second wiring300cross each other. In detail, a center of the piezoelectric element400may overlap an intersection point of the first sub-wiring201and the second sub-wiring301. In more detail, a center of each of the lower and upper surfaces of the piezoelectric element400may overlap a center of the first connection portion210of the first wiring200and a center of the second connection portion310of the second wiring300.

In addition, although not shown in the drawings, a vibration member (not shown) may be further disposed on the piezoelectric element. In order to improve vibration characteristics of the piezoelectric element400, the vibration member may be further disposed on the upper surface of the piezoelectric element400. For example, the vibration member may be a vibration plate. The vibration member may be disposed between the piezoelectric element400and the second wiring300.

The vibration member may be electrically connected to the piezoelectric element400. The vibration member may include a metal material. As an example, the vibration member may include at least one metal of aluminum (Al), copper (Cu), zinc (Zn), iron (Fe), nickel (Ni), chromium (Cr), silver (Ag), gold (Pt), stainless steel (SUS), and alloys thereof.

The vibration member may have a shape corresponding to the piezoelectric element400. For example, the vibration member may have a planar shape corresponding to the upper surface of the piezoelectric element400. In addition, the vibration member may have a width in the horizontal direction corresponding to the upper surface of the piezoelectric element400.

A thickness of the vibration member may be about 1500 μm or less. In detail, the thickness of the vibration member may be about 1200 μm or less. Preferably, the thickness of the vibration member may be about 1000 μm or less. It is preferable that the thickness of the vibration member satisfies the above-described range in consideration of the deformation characteristics of the piezoelectric part1000and the vibration characteristics of the piezoelectric element400.

The piezoelectric part1000according to the embodiment may include the protective layer550. The protective layer550may be disposed between the first base layer110and the second base layer120. The protective layer550may be disposed in direct contact with one surface of the first base layer110and one surface of the second base layer120.

The protective layer550may be disposed between the first base layer110and the second base laver120to protect the piezoelectric element400. In detail, the protective laver550may be disposed to surround the piezoelectric element400and the wirings200and300between the base layers110and120to protect the components.

The protective layer550may include a material having softness and elasticity. For example, the protective layer550may include at least one material of silicone, a thermoplastic resin, a thermoplastic silicone resin, a thermoplastic elastomer, a polyurethane elastomer, an ethylene vinyl acetate (EVA), a polyvinyl chloride (PVC) in which a harmless plasticizer and a stabilizer are added. The protective layer550may be preferable to include a silicone elastomer that is relatively light, may minimize irritation upon contact with the user's skin, and has a predetermined elasticity.

The protective layer550may be connected to the first base layer110and the second base layer120. For example, the protective layer550may be integrally formed with the first base layer110and the second base layer120. The protective layer550may be physically connected to the first base layer110and the second base layer120to protect components disposed therein.

The protective layer550may include the same material as the first base layer110and the second base layer120. That is, the first base layer110, the second base layer120, and the protective layer550may include the same kind of material, thereby having an improved bonding force.

A connection relationship between the piezoelectric element400, the first wiring200, and the second wiring300will be described in more detail with reference toFIG. 8.

Referring toFIG. 8, the piezoelectric element400may be electrically connected to the first wiring200and the second wiring300. In detail, the piezoelectric element400may include a first electrode410disposed on a lower surface thereof. The first electrode410may be disposed in a region of about 80% or more of the entire region of the lower surface of the piezoelectric element400in consideration of electrical characteristics. The first electrode410may be disposed in a region of about 90% of the entire region of the lower surface of the piezoelectric element400. In addition, the first electrode410may be disposed on the entire region of the lower surface of the piezoelectric element400.

The first electrode410may include a conductive material. As an example, the first electrode410may include a metal material. In detail, the first electrode410may include at least one metal of aluminum (Al), copper (Cu), silver (Ag), gold (Au), chromium (Cr), nickel (Ni), molybdenum (Mo), titanium (Ti), and alloys thereof.

The first electrode410may be disposed facing the first wire200and may be electrically connected to the first wire200. In detail, a first bonding layer451may be disposed between the first electrode410and the first wiring200. The first bonding layer451may physically and electrically connect the first electrode410and the first wiring200. An overlapping ratio between the first bonding layer451and the first wiring200may be about 20% or more in consideration of physical and electrical characteristics. In detail, an overlapping ratio of one surface of the first wiring200facing the piezoelectric element400and the first bonding layer451may be about 20% or more.

The first bonding layer451may include at least one metal of aluminum (Al), copper (Cu), silver (Ag), gold (Au), chromium (Cr), nickel (Ni), molybdenum (Mo), titanium (Ti), and alloys thereof.

A thickness of the first bonding layer451may be about 100 μm or less. In detail, the thickness of the first bonding layer451may be about 20 μm to about 80 μM. Preferably, the thickness of the first bonding layer451may be about 30 μm to about 60 μm.

The first bonding layer451may be disposed between the first electrode410and the first wiring200to serve as a conductive adhesive. As an example, the first bonding layer451may be applied in a form of a paste on the first wiring200, and the piezoelectric element400including the first electrode410may be disposed on the first bonding layer451. Accordingly, the piezoelectric element400may be physically and electrically connected to the first wiring200.

The piezoelectric element400may include a second electrode420disposed on an upper surface thereof. The second electrode420may be disposed in a region of about 80% or more of the entire region of the upper surface of the piezoelectric element400in consideration of electrical characteristics. In detail, the second electrode420may be disposed in a region of about 90% of the entire region of the upper surface of the piezoelectric element400. In addition, the second electrode420may be disposed on the entire region of the lower surface of the piezoelectric element400.

The second electrode420may include a conductive material. As an example, the second electrode420may include a metal material. In detail, the second electrode420may include at least one metal of aluminum (Al), copper (Cu), silver (Ag), gold (Au), chromium (Cr), nickel (Ni), molybdenum (Mo), titanium (Ti), and alloys thereof.

The second electrode420may be disposed facing the second wiring300and may be electrically connected to the second wiring300. In detail, a second bonding layer452may be disposed between the second electrode420and the second wiring300. The second bonding layer452may physically and electrically connect the second electrode420and the second wiring300. An overlapping ratio between the second bonding layer452and the second wiring300may be about 20% or more in consideration of physical and electrical characteristics. In detail, an overlapping ratio between one surface of the second wiring300facing the piezoelectric element400and the second bonding layer452may be about 20% or more.

The second bonding layer452may include at least one metal of aluminum (Al), copper (Cu), silver (Ag), gold (Au), chromium (Cr), nickel (Ni), molybdenum (Mo), titanium (Ti), and alloys thereof.

A thickness of the second bonding layer452may be about 100 μm or less. In detail, the thickness of the second bonding layer452may be about 20 μm to about 80 μm. Preferably, the thickness of the second bonding layer452may be about 30 μm to about 60 μm.

The second bonding layer452may be disposed between the second electrode420and the second wiring300to serve as a conductive adhesive. As an example, the second bonding layer452may be applied in the form of the paste on the second wiring300, and the piezoelectric element400including the second electrode420may be disposed on the second bonding layer452. Accordingly, the piezoelectric element400may be physically and electrically connected to the second wiring300.

The thickness of the first bonding layer451may be the same as or different from the thickness of the second bonding layer452. As an example, the thickness of the first bonding layer451may be provided with the same thickness as the second bonding layer452to improve the variability of the mask2000. As another example, the thickness of the first bonding layer451may be greater than the thickness of the second bonding layer452. Accordingly, the wavelengths emitted from the piezoelectric element400toward the first base layer110may be reflected by the first bonding layer451to move toward the second base layer120.

The protective layer550may be disposed to surround the piezoelectric element400, the first wiring200, the second wiring300, the first electrode410, the second electrode420, the first bonding layer451, and the second bonding layer452, and it is possible to prevent the components from being exposed to the outside.

FIG. 9is another exploded perspective view of a piezoelectric part according to an embodiment, andFIG. 10is a cross-sectional view of the piezoelectric part ofFIG. 9. In the description usingFIGS. 9 and 10, descriptions of configurations the same as or similar to as those of the above-described piezoelectric part are omitted, and the same reference numerals are assigned to the same as or similar to the configurations.

Referring toFIGS. 9 and 10, a piezoelectric part1000according to an embodiment may further include a first substrate510and a second substrate520.

The first substrate510may be disposed on the first base layer110. The first substrate510may be disposed between the first base layer110and the first wiring200. The first substrate510may be in direct contact with one surface of the first base layer110. In this case, the first wiring200may be spaced apart from the first base layer110and may be in direct contact with the first substrate510.

The first substrate510may be transparent and include a material in consideration of moisture barrier properties, thermal stability, and the like. In addition, the first substrate510may include a material that has flexibility and is elastically deformed depending on a shape of the user's skin. As an example, the first substrate510may include a resin material such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), and the like. The first substrate510may be provided in a form of a film.

The first substrate510may have a thickness of about 0.5 μm to about 5 μm or less. When the thickness of the first substrate510is less than about 0.5 μm, there may be a problem that a region of the first substrate510that overlaps the components is sagged by a weight of components disposed on the first substrate510, for example, the piezoelectric element400or the like. Accordingly, reliability of the first substrate510may be deteriorated, and a problem of alignment of the components disposed on the first substrate510may occur. In addition, when the thickness of the first substrate510exceeds about 5 μm, the overall thickness of the piezoelectric part1000and the overall thickness of the mask2000may be increased. Accordingly, there is a problem that the piezoelectric part1000may not be elastically deformed efficiently depending on the shape of the user's skin, so that the piezoelectric part1000may not be effectively adhered to the user's skin. Preferably, the first substrate510may have a thickness of about 0.5 μm to about 3 μm. When the thickness of the first substrate510satisfies the above-described range, the piezoelectric part1000may be elastically deformed efficiently in a form corresponding to the user's skin, and the overall thickness and weight of the mask2000may be decreased while maintaining reliability and alignment characteristics.

The second substrate520may be disposed on the second base layer120. The second substrate520may be disposed between the second base layer120and the second wiring300. The second substrate520may be in direct contact with one surface of the second base layer120. In this case, the second wiring300may be spaced apart from the second base layer120and may be in direct contact with the second substrate520.

The second substrate520may be transparent and include a material in consideration of moisture barrier properties, thermal stability, and the like. In addition, the second substrate520may include a material that has flexibility and is elastically deformed depending on the shape of the user's skin. As an example, the second substrate520may include the resin material such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), and the like. The second substrate520may be provided in a form of a film. The second substrate520may have the same material and shape as the first substrate510, but the embodiment is not limited thereto.

The second substrate520may have a thickness of about 0.5 μm to about 5 μm or less. When the thickness of the second substrate520is less than about 0.5 μm, there may be a problem that a region of the second substrate520that overlaps the components is sagged by a weight of components disposed on the second substrate520, for example, the piezoelectric element400or the like. Accordingly, reliability of the second substrate520may be deteriorated, and a problem of alignment of the components disposed on the second substrate520may occur. In addition, when the thickness of the second substrate520exceeds about 5 μm, the overall thickness of the piezoelectric part1000and the overall thickness of the mask2000may be increased. Accordingly, there is a problem that the piezoelectric part1000may not be elastically deformed efficiently depending on the shape of the user's skin, so that the piezoelectric part1000may not be effectively adhered to the user's skin. Preferably, the second substrate520may have a thickness of about 0.5 μm to about 3 μm. When the thickness of the second substrate520satisfies the above-described range, the piezoelectric part1000may be elastically deformed efficiently in a form corresponding to the user's skin, and the overall thickness and weight of the mask2000may be decreased while maintaining reliability and alignment characteristics. The second substrate520may have the same thickness as the first substrate510, but the embodiment is not limited thereto.

In the embodiment, as the first substrate510and the second substrate520are added, the alignment characteristics of the piezoelectric element400may be improved. In addition, as the first substrate510and the second substrate520are added, an inflow path of moisture and foreign substances introduced from the outside of the piezoelectric part1000to the inside may be increased, so that the piezoelectric part1000may have improved reliability.

FIG. 11is a cross-sectional view showing an example in which a protrusion is provided on a piezoelectric part according to an embodiment. In the description usingFIG. 11, descriptions of configurations the same as or similar to those of the above-described piezoelectric part are omitted, and the same reference numerals are assigned to the same as or similar to the configurations.

Referring toFIG. 11, a plurality of protrusions620may be disposed on one surface of the piezoelectric part1000facing the user's skin. In detail, the protrusion620may be disposed on the other surface of the second base layer120facing the user's skin.

The protrusion620may include a material harmless to the human body. As an example, the protrusion620may include the same maternal as the second base layer120. The protrusion620may be integrally formed with the second base layer120. The protrusion620may be disposed to protrude from the other surface of the second base layer120toward the user's skin. The protrusions620may be disposed on the other surface of the second base layer120in a shape of a plurality of points spaced apart from each other. In addition, the protrusions620may be disposed on the other surface of the second base layer120in a shape of a plurality of straight lines or curved lines spaced apart from each other. In addition, the protrusion620may be disposed on the other surface of the second base layer120in at least one line shape. As an example, the protrusion620may be disposed on the other surface of the second base layer120in at least one spiral shape.

When the user wears the mask2000, the protrusion620may form a predetermined space between the piezoelectric part1000and the user's skin. Accordingly, it is possible to prevent cosmetics or drugs between the piezoelectric part1000and the skin from being pushed out to an edge region of the piezoelectric part1000by the pressure generated when the mask2000are worn and/or the ultrasonic energy generated from the piezoelectric element400. That is, the protrusion620may serve as a partition wall preventing cosmetics or drugs from getting out of the piezoelectric part1000. Therefore, the user may effectively inject cosmetics or drugs into the skin using the mask2000.

FIG. 12is a cross-sectional view of an arrangement relationship between a body and a piezoelectric part according to an embodiment.

Referring toFIG. 12, the piezoelectric part1000may be disposed on the body2001. The body2001may include a plurality of support members2100, and the piezoelectric part1000may be disposed on the support member2100.

The support member2100may include a first support member2110, a second support member2120, and a third support member2130.

The first support member2110may face the user's skin. In detail, an upper surface of the first support member2110may be one surface of the above-described mask2000and may face the user's skin. The upper surface of the first support member2110may be in direct contact with the user's skin.

The first support member2110may include a material harmless to the human body. In addition, the first support member2110may include a material having softness and elasticity. For example, the first support member2110may include at least one material of silicone, a thermoplastic resin, a thermoplastic silicone resin, a thermoplastic elastomer, a polyurethane elastomer, an ethylene vinyl acetate (EVA), a polyvinyl chloride (PVC) in which a harmless plasticizer and a stabilizer are added. Preferably, the first support member2110may include a silicone elastomer that is relatively light, may minimize irritation upon contact with the user's skin, and has a predetermined elasticity. In addition, the first support member2110may be transparent or colored, but the embodiment is not limited thereto.

The first support member2110may include the same material as at least one of the first base layer110, the second base layer120, and the protective layer550of the piezoelectric part1000. As an example, when the first base layer110, the second base layer120, and the protective layer550include the same material, the first support member2110may have the same material as the components to have an improved bonding force.

The first support member2110may have a first thickness defined as a thickness in the vertical direction (z-axis direction). The first thickness may be about 500 μm to about 1.5 mm. In detail, the first thickness may be about 700 μm to about 1.3 mm. In more detail, the first thickness may be about 800 μm to about 1.2 mm. When the first thickness is less than about 500 μm, elastic deformation characteristics of the first support member2110may be deteriorated, and the third support member2130described later may not be effectively protected. In addition, when the first thickness exceeds about 1.5 mm, the overall thickness of the body2001may increase, and a weight of the mask2000may increase. Accordingly, the user wearing the mask2000may easily feel fatigue due to the weight of the mask2000. Preferably, the first thickness may be 950 μm to 1.05 mm in consideration of elastic deformation characteristics, reliability, and weight of the first support member2110.

The second support member2120may be disposed below the first support member2110. The second support member2120may be disposed outside. A lower surface of the second support member2120may be exposed to the outside as the other surface of the mask2000described above. The second support member2120may be spaced apart from the user's skin.

The second support member2120may include a material harmless to the human body. In addition, the second support member2120may include a material having softness and elasticity. For example, the second support member2120may include at least one material of silicone, a thermoplastic resin, a thermoplastic silicone resin, a thermoplastic elastomer, a polyurethane elastomer, an ethylene vinyl acetate (EVA), a polyvinyl chloride (PVC) in which a harmless plasticizer and a stabilizer are added. Preferably, the second support member2120may include a silicone elastomer that is relatively light, may minimize irritation upon contact with the user's skin, and has a predetermined elasticity. In addition, the second support member2120may be transparent or colored, but the embodiment is not limited thereto. As an example, the first support member2110and the second support member2120may be colored so that the third support member2130is not visible to the outside.

The second support member2120may include the same material as at least one of the first base layer110, the second base layer120, and the protective layer550of the piezoelectric part1000. As an example, when the first base layer110, the second base layer120, and the protective layer550include the same material, the second support member2120may include the same material as the components. In addition, the second support member2120may include the same material as the first support member2110. Accordingly, the first support member2110and the second support member2120may have an improved bonding force with the piezoelectric part1000.

The second support member2120may have a second thickness defined as a thickness in the vertical direction (z-axis direction). The second thickness may be about 500 μm to about 1.5 mm. In detail, the second thickness may be about 700 μm to about 1.3 mm. In more detail, the second thickness may be about 800 μm to about 1.2 mm. When the second thickness is less than about 500 μm, elastic deformation characteristics of the second support member2120may be deteriorated, and the third support member2130disposed between the first support member2110and the second support member2120may not be effectively protected. In addition, when the second thickness exceeds about 1.5 mm, the overall thickness of the body2001may increase, and the weight of the mask2000may increase. Accordingly, the user wearing the mask2000may easily feel fatigue due to the weight of the mask2000. Preferably, the second thickness may be 950 μm to 1.05 mm in consideration of elastic deformation characteristics, reliability, and weight of the second support member2120. In addition, the thickness (second thickness) of the second support member2120may be the same as the thickness (first thickness) of the first support member2110. Accordingly, the mask2000may have improved process efficiency.

The third support member2130may be disposed between the first support member2110and the second support member2120. The third support member2130may support the first and second support members2110and2120between the first and second support members2110and2120. An upper surface of the third support member2130may face and be in direct contact with a lower surface of the first support member2110. In addition, a lower surface of the third support member2130may face and be in direct contact with an upper surface of the second support member2120. The first support member2110and the second support member2120may be disposed to surround the outside of the third support member2130. As an example, the drawing shows only a cross section of a partial region of the body2001, but at least one of the first and second support members2110and2120may be disposed on a side surface of the third support member2130. Accordingly, the third support member2130may not be exposed to the outside by the first and second support members2110and2120.

The third support member2130may include a material different from the first support member2110and the second support member2120. In detail, the third support member2130may include a material having a higher strength than the first support member2110and the second support member2120. The third support member2130may include a metal material. For example, the third support member2130may include at least one metal of aluminum (Al), copper (Cu), silver (Ag), gold (Au), platinum (Pt), chromium (Cr), nickel (Ni), molybdenum (Mo), titanium (Ti), tin (Sn), tungsten (W), iron (Fe), and alloys thereof.

The third support member2130may have a third thickness defined as a thickness in the vertical direction (z-axis direction). The third thickness may be smaller than the first and second thicknesses. For example, the third thickness may be about 200 μm to about 1.2 mm. In detail, the third thickness may be about 300 μm to 1.1 mm. When the third thickness is less than about 200 μm, it may be difficult for the third support member2130to effectively support the first and second support members2110and2120. Accordingly, the reliability of the mask2000may be deteriorated, and it may be difficult to maintain a shape of the mask2000. In addition, when the third thickness exceeds about 1.2 mm, elastic deformation characteristics of the body2001may be deteriorated, and a thickness of the body2001, furthermore, the overall thickness and weight of the mask2000may increase. Accordingly, the user wearing the mask2000may easily feel fatigue due to the weight of the mask2000. Preferably, the third thickness may be about 350 μm to about 850 μm in consideration of elastic deformation characteristics, reliability, and weight of the body2001.

The body2001may include a first recess R1. The first recess R1may be disposed on one surface of the body2001facing the user's skin. The first recess R1may have a concave shape from one surface of the body2001toward the other surface, for example, in an outward direction of the body2001.

The first recess R1may be formed in a region corresponding to at least one of the first region2031, the second region2033, and the third region2035of the mask2000described above. For example, the first recess R1on the first region2031may be provided in a shape and a plane area corresponding to the user's brow region. In addition, the first recess R1on the second region2033may be provided in a shape and a plane area corresponding to the right eye rim region of the user. In addition, the first recess R1on the third region2035may be provided in a shape and a plane area corresponding to the left eye rim region of the user.

The first recess R1may be formed on the first support member2110and the third support member2130. The first recess R1may be formed to pass through the first support member2110and the third support member2130. The upper surface of the second support member2120facing the user's skin may be exposed under the first recess R1.

The piezoelectric part1000may be disposed in the first recess R1. The piezoelectric part1000may have a shape corresponding to the first recess R1. As an example, when viewed in a plane, the piezoelectric part1000may have a horizontal width corresponding to the first recess R1. In addition, the piezoelectric part1000may have a plane area corresponding to the first recess R1. The piezoelectric part1000may be inserted and fixed in the first recess R1. In this case, the first base layer110of the piezoelectric part1000may face the upper surface of the second support member2120, and the second base layer120may face the user's skin.

A sidewall of the first recess R1may face a part of a side surface of the piezoelectric part1000. In detail, a side surface of the first support member2110and a side surface of the third support member2130that are exposed by the first recess R1may be in direct contact with a side surface of the piezoelectric part1000.

The piezoelectric part1000may be disposed to be partially or entirely inserted in the first recess R1. For example, when a part of the piezoelectric part1000is disposed in the first recess R1, a height of the first recess R1in the vertical direction (z-axis direction) may be different from a height of the piezoelectric part1000in the vertical direction (z-axis direction). In detail, the height of the first recess R1may be smaller than the height of the piezoelectric part1000. Accordingly, a part of the piezoelectric part1000may be disposed to be inserted in the first recess R1, and the rest of the piezoelectric part1000may have a shape protruding from one surface of the body2001, for example, the upper surface of the first support member2110toward the user's skin. In detail, the piezoelectric part1000may protrude further toward the user than the one surface on one surface of the body2001facing the user's skin. That is, an upper surface of the second base layer120may be disposed above the upper surface of the first support member2110.

In this case, a height of the piezoelectric part1000protruding from one surface of the body2001may be defined as a first height h1, and the first height h1may be about 15% to about 85% of the overall thickness (z-axis direction) of the piezoelectric part1000. In detail, the first height h1may be about 20% to about 80% of the overall thickness of the piezoelectric part1000.

When a ratio of the first height h1to the overall thickness of the piezoelectric part1000is less than 15%, when the user wears the mask2000, the degree to which the piezoelectric part1000protrudes from one surface of the body2001may be small. In this case, the piezoelectric part1000may be spaced apart from the users skin without direct/indirect contact with the user's skin, and thus, it may be difficult to effectively provide ultrasonic energy to the user's skin.

In addition, when the ratio of the first height h1to the overall thickness of the piezoelectric part1000exceeds 85%, the degree to which the piezoelectric part1000protrudes from one surface of the body2001may be too large. In this case, the piezoelectric part1000may be separated from the body2001while the user wears or removes the mask2000or the ultrasonic energy is emitted from the piezoelectric part1000.

Therefore, it is preferable that the height (first height h1) of the piezoelectric part1000exposed on the body2001satisfies the above-described range in consideration of the reliability of the mask2000and ultrasonic energy provided to the skin.

An adhesive member2300may be disposed between the body2001and the piezoelectric part1000. The adhesive member2300may include at least one of acrylic, synthetic rubber, natural rubber, synthetic resin, epoxy, and silicone.

The adhesive member2300may be disposed in the first recess R1. The adhesive member2300may be disposed on the second support member2120exposed under the first recess R1. In detail, the adhesive member2300may be disposed on the upper surface of the second support member2120exposed by the first recess R1. The piezoelectric part1000may be fixed on the body2001by the adhesive member2300.

The adhesive member2300may have a shape corresponding to the first recess R1. When viewed in a plane, a plane area of the adhesive member2300may be less than or equal to the plane area of the first recess R1. For example, the adhesive member2300may be provided in the same plane area as the first recess R1to improve adhesion between the body2001and the piezoelectric part1000.

A thickness (z-axis direction) of the adhesive member2300may be about 20 μm to about 100 μm. In detail, the thickness of the adhesive member2300may be about 30 μm to about 70 μm. When the thickness of the adhesive member2300is less than about 20 μm, the adhesion between the piezoelectric part1000and the body2001may be low. In addition, when the thickness of the adhesive member2300is about 100 μm, elastic deformation characteristic of the mask2000may be deteriorated by the adhesive member2300. Preferably, the thickness of the adhesive member2300may be about 35 μm to about 50 μm in consideration of the adhesion and the elastic deformation characteristics of the mask2000.

FIGS. 13 to 15are other cross-sectional views of an arrangement relationship between a body and a piezoelectric part according to an embodiment. In the description usingFIGS. 13 to 15, descriptions of configurations the same as or similar to those of the above-described mask are omitted, and the same reference numerals are assigned to the same as or similar to the configurations.

First, referring toFIG. 13, the body2001may include a first recess R1. The first recess R1may be disposed on one surface of the body2001facing the user's skin. The first recess R1may have a concave shape from one surface of the body2001toward the other surface of the body2001.

The first recess R1may be formed on the first support member2110. The first recess R1may be formed to pass through the first support member2110. The upper surface of the third support member2130facing the user's skin may be exposed under the first recess R1.

The piezoelectric part1000may be disposed in the first recess R1. In this case, the first base layer110of the piezoelectric part1000may face the upper surface of the third support member2130, and the second base layer120may face the user's skin. In addition, the side surface of the first recess R1may face a part of the side surface of the piezoelectric part1000. In detail, the side surface of the first support member2110exposed by the first recess R1may be in direct contact with the side surface of the piezoelectric part1000.

An adhesive member2300may be disposed between the body2001and the piezoelectric part1000. The adhesive member2300may be disposed in the first recess R1. The adhesive member2300may be disposed on the third support member2130exposed under the first recess R1. In detail, the adhesive member2300may be disposed on the upper surface of the third support member2130exposed by the first recess R1. The piezoelectric part1000may be fixed on the body2001by the adhesive member2300.

Referring toFIG. 14, the body2001may include a first recess R1formed on the first support member2110. The piezoelectric part1000may be disposed in the first recess R1. In this case, the first base layer110of the piezoelectric part1000may face the upper surface of the second support member2120, and the second base layer120may face the user's skin. The piezoelectric part1000may be fixed on the body2001by the adhesive member2300. In detail, the adhesive member2300may be disposed on the upper surface of the third support member2130exposed by the first recess R1, and the piezoelectric part1000may be fixed on the body2001by the third support member2130.

In addition, the body2001may include a second recess R2. The second recess R2may be formed in the first recess R1. The second recess R2may have a concave shape from one surface of the body2001toward the other surface of the body2001.

The second recess R2may be formed on the third support member2130. In detail, the second recess R2may be formed on the third support member2130and the adhesive member2300. The second recess R2may be formed to pass through the third support member2130and the adhesive member2300. That is, a height h2of the second recess R2may correspond to a sum of a thickness of the third support member2130and the thickness of the adhesive member2300. Accordingly, the upper surface of the second support member2120may be exposed under the second recess R2.

The second recess R2may have a planar shape corresponding to the piezoelectric element400. In addition, the second recess R2may be formed in a region corresponding to the piezoelectric part1000. In detail, the second recess R2may be disposed in a region overlapping the piezoelectric element400in the vertical direction. In more detail, a center of the second recess R2may overlap a center of the piezoelectric element400in the vertical direction.

A horizontal width d2of the second recess R2may be smaller than that of the first recess R1. In detail, the horizontal width d2of the second recess R2may be the same as or different from a horizontal width of the piezoelectric element400. For example, when the planar shape of the piezoelectric element400and the second recess R2is circular, a diameter d2of the second recess R2may be about 40% to 160% of a diameter of the piezoelectric element400. In detail, a diameter d2of the second recess R2may be 50% to 150% of the diameter of the piezoelectric element.

As the diameter d2of the second recess R2satisfies the above-described range, wave energy emitted from the piezoelectric element400may be more effectively reflected in an upper direction, for example, toward the second base layer120. Accordingly, the mask2000according to the embodiment may further minimize loss of ultrasonic energy emitted from the piezoelectric part1000and may effectively provide the ultrasonic energy to the user's skin.

Referring toFIG. 15, the body2001may include a plurality of support members2100, and the piezoelectric part1000may be disposed on the support member2100.

The support member2100may further include a fourth support member2140in addition to the first to third support members2110,2120, and2130described above.

The fourth support member2140may be disposed between the first support member2110and the third support member2130. The fourth support member2140may be disposed closer to the first support member2110than the second support member2120. The fourth support member2140may be disposed on a lower surface of the first support member2110.

The fourth support member2140may support the first and second support members2110and2120between the first and second support members2110and2120. The fourth support member2140may include a material having a higher strength than the first and second support members2110and2120. For example, the fourth support member2140may include a metal material. In detail, the fourth support member2140may include at least one metal of aluminum (Al), copper (Cu), silver (Ag), gold (Au), platinum (Pt), chromium (Cr), nickel (Ni), molybdenum (Mo), titanium (Ti), tin (Sn), tungsten (W), iron (Fe), and alloys thereof.

A thickness of the fourth support member2140may be smaller than the thickness of each of the first and second support members2110and2120. For example, the thickness of the fourth support member2140may be about 200 μm to about 1.2 mm. In detail, the thickness of the fourth support member2140may be about 300 μm to 1.1 mm. Preferably, the thickness of the fourth support member2140may be about 350 μm to about 850 μm in consideration of the elastic deformation characteristics, reliability, weight of the body2001. In addition, the thickness of the fourth support member2140may be provided equal to the thickness of the third support member2130. Accordingly, the mask2000may have improved process efficiency.

The body2001may include a first recess R1. The first recess R1may be disposed on one surface of the body2001facing the user's skin. The first recess R1may have a concave shape from one surface of the body2001toward the other surface of the body2001.

The first recess R1may be formed on the first support member2110and the fourth support member2140. The first recess R1may be formed to pass through the first support member2110and the fourth support member2140. The upper surface of the third support member2130may be exposed under the first recess R1.

The piezoelectric part1000may be disposed in the first recess R1. In this case, the first base layer110of the piezoelectric part1000may face the upper surface of the third support member2130, and the second base layer120may face the user's skin. In addition, the side surface of the first recess R1may face a part of the side surface the side surface of the piezoelectric part1000. In detail, the side surface of the first support member2110exposed by the first recess R1and a side surface of the fourth support member may be in direct contact with the side surface of the piezoelectric part1000.

An adhesive member2300may be disposed between the plurality of support members2100. The adhesive member2300may include at least one of acrylic, synthetic rubber, natural rubber, synthetic resin, epoxy, and silicone.

The adhesive member2300may include a first adhesive member2310disposed between the body2001and the piezoelectric part1000. The first adhesive member2310may be disposed in the first recess R1. The first adhesive member2310may be disposed on the third support member2130exposed under the first recess R1. In detail, the first adhesive member2310may be disposed on the upper surface of the third support member2130exposed by the first recess R1. Accordingly, the piezoelectric part1000may be fixed on the body by the first adhesive member2310. In addition, the first adhesive member2310may be disposed between the third support member2130and the fourth support member2140. Accordingly, the first adhesive member2310may adhere the third support member2130and the fourth support member2140to each other.

The adhesive member2300may include a second adhesive member2320disposed between the first support member2110and the fourth support member2140. The second adhesive member2320may adhere the first support member2110and the fourth support member2140to each other. In addition, a side surface of the second adhesive member2320exposed by the first recess R1may be in direct contact with the side surface of the piezoelectric part1000. Therefore, the piezoelectric part1000may be more stably coupled to the body2001. In detail, the first adhesive member2310and the second adhesive member2320are respectively disposed on the side surface and the lower surface of the piezoelectric part1000, so that the piezoelectric part1000may have improved adhesion on the body2001.

In addition, the body2001may include a second recess R2. The second recess R2may be formed in the first recess R1. The second recess R2may have a concave shape from one surface of the body2001toward the other surface of the body2001.

The second recess R2may be formed on the third support member2130. In detail, the second recess R2may be formed on the third support member2130and the adhesive member2300. The second recess R2may be formed to pass through the third support member2130and the adhesive member2300. The upper surface of the second support member2120may be exposed under the second recess R2.

The second recess R2may have a planar shape corresponding to the piezoelectric element400. In addition, the second recess R2may be formed in a region corresponding to the piezoelectric part1000. In detail, the second recess R2may be disposed in a region overlapping the piezoelectric element400in the vertical direction.

A horizontal width of the second recess R2may be smaller than that of the first recess R1. In detail, the horizontal width of the second recess R2may be the same as or different from a horizontal width of the piezoelectric element400. For example, when the planar shape of the piezoelectric element400and the second recess R2is circular, a diameter of the second recess R2may be about 40% to about 160% of a diameter of the piezoelectric element400. In detail, the diameter of the second recess R2may be 50% to 150% of the diameter of the piezoelectric element.

FIG. 16is a front view of a user wearing a mask according to an embodiment, andFIG. 17is a rear view of the user wearing the mask according to the embodiment. In addition,FIG. 18is a view showing an arrangement relationship between a mask and skin according to an embodiment.

Referring to16to18, a user15may wear the mask2000. For example, the user may place the opening2010of the mask2000at a position corresponding to both eyes of the user, and the bending portion2020of the mask2000may be mounted on the nose to set a position of the mask2000. Thereafter, the user may fix the mask2000on the face of the user through the extension portion2050and/or the fixing member2070.

Accordingly, the first to third regions2031,2033, and2035of the mask2000may be disposed to correspond to the blow, right eye rim, and left eye rim regions of the user15, respectively. In addition, the piezoelectric part1000according to the embodiment may be disposed on the first to third regions2031,2033, and2035, and the piezoelectric part1000may be disposed to face the blow, right eye rim, and left eye rim regions of the user15. In this case, the piezoelectric part1000may be in direct contact with a skin15of the blow, right eye rim, and left eye rim regions of the user10and may be in indirect contact with the skin15by cosmetics or drugs between the piezoelectric part1000and the skin15.

In addition, the mask2000according to the embodiment may include a power supply unit (not shown). The power supply unit may be disposed outside the mask2000. For example, the power supply unit may be provided in a form of a terminal on the other surface of the mask2000. The mask2000may receive power by connecting an external power cable or the like to the power supply unit.

The mask2000may be operated by applied power. For example, the piezoelectric part1000may generate ultrasonic energy to power applied through the power supply unit. The ultrasonic energy of the piezoelectric part1000may cause cracks in the stratum corneum of the skin15of the user15to form a fine perforation and may effectively absorb cosmetics or drugs between the mask2000and the skin15of the user15.

In addition, the mask2000may include a deformable member (not shown). The deformable member may be disposed on one surface of the mask2000facing the skin15of the user15. The deformable member may be disposed in a region other than the first to third areas2031,2033, and2035.

The deformable member may include a material of which shape is changed by external pressure. As an example, the deformable member may include a material such as an air gap or a sponge, but the embodiment is not limited thereto, and may include various materials of which shape is changed by external pressure. Accordingly, when the user15wears the mask2000, the deformable member may be deformed into a shape corresponding to a face shape of the user15. Therefore, the mask2000and the skin15of the user15may be effectively adhered to each other. In addition, when a plurality of users wear the mask2000, the deformable member may be deformed to correspond to each face shape, so that the skin15of the user15and the mask2000may be effectively adhered to each other.

That is, the mask2000according to the embodiment may be effectively adhered to the skin15of the user15. In detail, the body2001of the mask2000and the piezoelectric part1000on the body2001may be elastically deformed to correspond to a shape of the skin15of the user15. In addition, the piezoelectric part1000may include a plurality of piezoelectric elements400to provide uniform ultrasonic energy to a skin region corresponding to the piezoelectric part1000. Accordingly, the mask2000may maximize the supply of cosmetics or drugs to a region where wrinkles are relatively easy to occur, a region where a stratum corneum is easily formed, and a region where effective supply of cosmetics or drugs is required of the skin of the user15, it is possible to effectively care or treatment the skin15of the user15in a short time.

Hereinafter, a skin care device including a mask according to an embodiment will be described with reference toFIGS. 19 to 25.

Referring toFIGS. 19 and 20, a skin care device1according to an embodiment may include a mask2000and a controller3000.

The mask2000according to the embodiment may include a first terminal part2090. The first terminal part2090may be disposed on the other surface of the mask2000. In detail, the first terminal part2090may be disposed on an outer surface of the body2001. The first terminal part2090may be spaced apart from the piezoelectric region2030. As an example, the first terminal part2090may be disposed on a relatively flat region, for example, on a region corresponding to a user's temple.

The first terminal part2090may be electrically connected to the piezoelectric part1000and may be connected to a terminal part (a second terminal part3330) of the controller3000described later. The first terminal part2090may provide an electric signal, a control signal, a power signal, and the like that are applied from the controller3000to the piezoelectric part1000of the mask2000. In detail, the first to third piezoelectric parts1000a,1000b, and1000cmay provide the same or different ultrasonic energy to the user's skin by a signal applied from the controller3000.

The controller3000may be connected to the mask2000. The controller3000may be physically and electrically connected to the mask2000. The controller3000may provide a control signal, power, and the like to the mask2000.

The controller3000may include a body3100. The body3100may have a predetermined strength and may include a material harmless to the human body. For example, the body3100may include at least one material of plastic, polypropylene (PP), polyethylene (PE), polycarbonate (PC), polybutylene terephthalate (PBT), acrylonitrile butadiene styrene copolymer (ABS), poly oxy methylene, polyacetal (POM), polyphenylene oxide (PPO) resin, and a modified PPO resin. In addition, the body3100may include glass or metal. As an example, the body3100may include at least one of silver (Ag), chromium (Cr), molybdenum (Mo), nickel (Ni), aluminum (Al), stainless steel, and alloys thereof.

The controller3000may include a connection portion. The connection portion may be disposed between the body3100of the controller3000and the mask2000and may connect the body3100and the body2001of the mask2000.

The connection portion may include a connection wire3310and the second terminal part3330. The connection wire3310may be disposed between the body3100and the second terminal part3330. For example, one end of the connection wire3310may be connected to the body3100of the controller3000, and the other end opposite to one end of the connection wire3310may be connected to the second terminal part3330. The connection wire3310may be electrically connected to components disposed in an accommodation space of the body3100. The connection wire3310may be a wire connecting an electrical signal, power, and the like between the controller3000and the mask2000.

The second terminal part3330of the controller3000may have a shape corresponding to the first terminal part2090and may be connected to the first terminal part2090of the mask2000. The second terminal part3330may be physically and electrically connected to the first terminal part2090. The controller3000may provide the control signal to the piezoelectric part1000of the mask2000through the first terminal part2090and the second terminal part3330.

The body3100may include the accommodation space (not shown) therein. A circuit board (not shown), a power supply unit (not shown), and the like may be disposed in the accommodation space of the body3100.

The circuit board may include at least one of a printed circuit board (PCB) made of a resin material, a metal core PCB (MCPCB), a nonflexible PCB, a flexible PCB (FPCB), and a ceramic material. The circuit board may include a layer of resin material or a ceramic-based layer, and the resin material may be formed of a silicone, an epoxy resin, a thermosetting resin including a plastic material, or a highly heat resistant or highly light resistant material. The ceramic material may include low temperature cofired ceramic (LTCC) or high temperature cofired ceramic (HTCC) that is simultaneously fired. At least one control element for controlling the mask2000and the controller3000may be disposed on the circuit board.

The power supply unit may supply power to the skin care device1. For example, the power supply unit may supply power to each of the controller3000and the mask2000. The power supply unit may include a battery. The battery may include at least one selected from a primary battery such as a manganese (Mn) battery, an alkaline battery, a mercury battery, a silver oxide battery, and the like. In addition, the battery may include at least one selected from a secondary battery such as a nickel cadmium (Ni—Cd) battery, a nickel hydrogen (Ni-MH) battery, and a lithium ion (Li-ion) battery, and the like.

When the power supply unit of the skin care device1includes a rechargeable secondary battery, a charging terminal part (not shown) for charging may be disposed outside the body3100. The charging terminal part may be electrically connected to the power supply unit disposed inside the body3100, and a part of the charging terminal part may be exposed outside the body3100. The user may charge the battery by connecting a charging cable, a USB cable, or the like to the charging terminal part exposed to the outside of the body3100.

A button part3200may be disposed outside the body3100. The button part3200may include at least one physical button for controlling power, operation, intensity, and the like of the skin care device1. In addition, the button part3200may include an electric button on which the touch electrode or the like is formed. The user may control the power, operation mode, and operation intensity of the skin care device1through the button part3200.

The button part3200may be provided outside the body3100in plural. For example, the button part3200may include a first button3211, a second button3212, and a third button3213disposed in a front region of the body3100. The first button3211may be a switch for selecting the first piezoelectric part1000a, the second button3212may be a switch for selecting the second piezoelectric part1000b, and the third button3213may be a switch for selecting the third piezoelectric part1000c. In addition, the button part3200may include a fourth button3214disposed in the front region of the body3100. The fourth button3214may be a switch for selecting all of the first to third piezoelectric parts1000a,1000b, and1000cat once.

The button part3200may include an operation button3230and a stop button3240disposed in the front region of the body3100. The operation button3230may be a switch for starting the operation of the piezoelectric part selected by the first to fourth buttons3211,3212,3213, and3214. In addition, the stop button3240may be a switch for stopping or temporarily stopping the operation of the piezoelectric parts1000a,1000b, and1000cin operation.

The button part3200may include control buttons3221and3222. The control buttons3221and3222may be disposed in a side region of the body3100. The control button may include an upper control button3221and a lower control button3222. The control buttons3221and3222may adjust operation intensity of the piezoelectric part1000within a set range.

A display part3300may be disposed outside the body3100. The display part3300may display a state of the skin care device1. For example, the display part3300may display a connection state, an operation mode, a power state, and the like of the skin care device1. For example, the display part3300may include displays such as LCD, LED, OLED, and QD to provide information to the user. In addition, the display part3300may include an indicator lamp. The indicator lamp may provide information to the user through emission color, emission time, and the like. For example, when the user operates the skin care device1through the button part3200, the indicator lamp may emit light with a set color. In addition, the indicator lamp may emit light in various colors depending on a piezoelectric part operating among the first to third piezoelectric parts1000a,1000b, and1000c. In addition, the indicator lamp may emit light in various colors according to the operation intensity of the piezoelectric part1000. Accordingly, the display part3300may effectively provide information on the state of the skin care device1to the user.

A speaker (not shown) may be disposed in the accommodation space of the body3100. The speaker may output information about a state of the skin care device1, for example, a power state, an operation state, and the like, by sound. For example, when the user operates the skin care device1, the speaker may output a sound for the start of the operation, and when the user stops the operation of the skin care device1or a set time of the skin care device1ends, the speaker may output a sound for the end of the operation.

FIG. 21is a flowchart showing an operation of a skin care device according to an embodiment, andFIG. 22is a block diagram showing a configuration of a skin care device according to an embodiment. In addition,FIGS. 23 to 25are views showing a method of operating first to third piezoelectric parts according to an embodiment.

First, a method of operating the skin care device1according to an embodiment will be described with reference toFIG. 21.

The method of operating of the skin care device1may include supplying power to the skin care device1. The supplying of power may be an operation of supplying power to the mask2000and the controller3000under control of the user. In detail, the supplying of power may be an operation of turning on the power of the skin care device1by the user. For example, the user may control the power of the skin care device1through a separate power switch or the operation button3230disposed on the controller3000.

In addition, the method of operating of the skin care device1may include selecting a region and an intensity. The selecting of the region and intensity may be an operation in which the user selects a region to which ultrasonic energy is applied and selects an intensity of the applied ultrasonic energy. For example, in the operation, the user may select one or more of the first to fourth buttons3211,3212,3213, and3214to select a piezoelectric part to be driven. Thereafter, the user may select an intensity of ultrasonic energy emitted from the selected piezoelectric part by using the control buttons3221and3222.

As an example, in the operation, the user may select the first piezoelectric part1000acorresponding to the user's brow region through the first button3211. In addition, in the operation, the user may select an intensity of ultrasonic energy emitted from the first piezoelectric part1000athrough the control buttons3221and3222of the controller3000. In this case, information on a region and intensity set by the user may be provided on the display part3300.

As another example, in the operation of selecting the region and the intensity, the user may select the second piezoelectric part1000bcorresponding to the user's right eye rim through the second button3212of the controller3000and may select the third piezoelectric part1000ccorresponding to the user's right eye rim through the third button3213. In addition, in the operation, the user may select an intensity of ultrasonic energy emitted from each of the second piezoelectric part1000bor the third piezoelectric part1000cselected through the control buttons3221and3222of the controller3000. In this case, information on the region and intensity set by the user may be provided on the display part3300.

As still another example, in the operation of selecting the region and intensity, the user may select the first to third piezoelectric parts1000a,1000b, and1000ccorresponding to the user's blow, right eye rim, and left eye rim through the fourth button3214of the controller3000. In addition, in the operation, the user may select the intensity of ultrasonic energy emitted from each of the first to third piezoelectric parts1000a,1000b, and1000cthrough the control buttons3221and3222of the controller3000. In this case, information on the region and intensity set by the user may be provided on the display part.

In addition, the method of operating the skin care device1may include an operation of operating. The operation of operating may be an operation of operating in the region and intensity selected in the operation of selecting the region and intensity. For example, the operation of operating may be an operation of operating the mask2000through the operation button3230after the user selects at least one of the first to fourth buttons3211,3212,3213, and3214. That is, the operating of operating may be an operation of providing ultrasonic energy to the user's skin.

Thereafter, the skin care device1may automatically end the operation after the operation for the set time. In addition, the skin care device1may be temporarily stopped or terminated under the user's control during the operation for the set time. For example, the user may temporarily stop or terminate the operation of the mask2000through the stop button3240during the operation of the skin care device1.

That is, the skin care device1according to the embodiment may effectively provide the ultrasonic energy to the user's skin. For example, the user may selectively provide the ultrasonic energy to the user's skin through the skin care device1. In detail, the user may select a region where the ultrasonic energy is provided through the first to fourth buttons3211,3212,3213, and3214and may set the intensity of ultrasonic energy provided through the control buttons3221and3222.

In addition, the skin care device1according to the embodiment may provide different ultrasonic energy depending on the region to minimize stimulation of a relatively sensitive skin region. In detail, the first piezoelectric part1000acorresponding to the user's brow region may provide ultrasonic energy greater than those of the second and third piezoelectric parts1000band1000ccorresponding to both eye rim regions that are relatively sensitive to stimulation.

As an example, each of the first to third piezoelectric parts1000a,1000b, and1000cmay be divided into ten levels of operation intensity by the control buttons3221and3222. In this case, the operation intensity of each operation of the first piezoelectric part1000amay be greater than the operation intensity of each operation of the second and third piezoelectric parts1000band1000ccorresponding thereto.

That is, ultrasonic energy having an intensity smaller than that of the first piezoelectric part1000ais provided to the second and third piezoelectric parts1000band1000ccorresponding to the skin region that is relatively sensitive to stimulation, thereby minimizing the user's skin stimulation and providing optimal ultrasonic energy.

In addition, the skin care device1according to the embodiment may provide uniform ultrasonic energy to the user's skin.

Referring toFIG. 22, the controller3000may include a microcontroller unit (MCU)3010and a switch unit3030. The microcontroller unit3010and the switch unit3030may be connected to the piezoelectric part1000and may control the operation of the piezoelectric part1000.

The microcontroller unit3010may receive information input from the button part3200. The microcontroller unit3010may generate a driving signal corresponding thereto in response to the received information. The microcontroller unit3010may control an operation of the switch unit3030and may control input waveforms applied to the plurality of piezoelectric parts1000. For example, the microcontroller unit3010may control a voltage, a frequency, a pulse width, and the like applied to each of the plurality of piezoelectric parts1000.

The switch unit3030may be disposed between the microcontroller unit3010and the piezoelectric part1000. The switch unit3030may include a switch. For example, the switch unit3030may include one or a plurality of switches selected from single pole single throw (SPST), single pole dual throw (SPDT), dual poles single throw (DPST), dual poles dual throw (DPDT), reversing DPDT, and three and more (multi) poles single throw)), and multi poles dual throw (MPDT).

The switch unit3030may control ON/OFF of the first to third piezoelectric parts1000a,1000b, and1000cbased on a control signal applied from the microcontroller unit3010.

As an example, in the operation of selecting the region and intensity, the user may select one of the first to third buttons3211,3212, and3213. For example, the user may select only the first button3211as shown inFIG. 7. In this case, the switch unit3030may switch the first piezoelectric part1000ato an ON state and may switch the second piezoelectric part1000band the third piezoelectric part1000band1000cto an OFF state. Accordingly, the first piezoelectric part1000amay be provided with at least one operation waveform of a voltage of the intensity set by the user, a frequency, and a pulse width.

In this case, the first piezoelectric part1000amay operate while repeating ON and OFF as shown inFIG. 23A. In detail, the first piezoelectric part1000amay operate for an operating time OT set by the switch unit3030to emit ultrasonic energy and may stop the operation for a waiting time WT set after the operating time OT is terminated. In addition, the first piezoelectric part1000amay repeat a process of operating again during the operating time OT after the waiting time WT and stopping the operation again during the waiting time WT. The first piezoelectric part1000amay repeat the process until the set time of the skin care device1or an end time by the user.

The operating time OT and the waiting time WT may be the same or different from each other. In addition, the waiting time WT may be a very short time. In detail, the waiting time WT may be a time that the user may not recognize. For example, the waiting time WT may be several milliseconds (ms) to several tens of milliseconds. Accordingly, the user using the skin care device1may recognize that ultrasonic energy is continuously provided to the skin region corresponding to the first piezoelectric part1000a.

In addition, the first piezoelectric part1000amay maintain an ON state as shown inFIG. 23B. For example, the first piezoelectric part1000amay maintain the ON state until a set time of the skin care device1or a forced termination time of the user by the switch unit3030.

As another example, in the operation of selecting the region and intensity, the user may select two switches among the first to third buttons3211,3212, and3213. For example, the user may select the first button3211and the third button3213as shown inFIG. 8. In this case, the switch unit3030may switch the first piezoelectric part1000aand the third button3213to an ON state and may switch the second piezoelectric part1000bto an OFF state. Accordingly, an operation waveform such as a voltage of the intensity set by the user, a frequency, and a pulse width may be provided to each of the first piezoelectric part1000aand the third piezoelectric part1000c.

In this case, the first piezoelectric part1000aand the third piezoelectric part1000cmay operate w % bile repeating ON and OFF as shown inFIG. 24. In detail, the first piezoelectric part1000amay operate for a first operating time OT1set by the switch unit3030to emit ultrasonic energy and may stop the operation for a first waiting time WT1set after the first operating time OT1is terminated. In addition, the first piezoelectric part1000amay repeat a process of operating again during the first operating time OT1after the first waiting time WT1and stopping the operation again during the first waiting time WT1.

In addition, the third piezoelectric part1000cmay operate for a third operating time OT3set by the switch unit3030to emit ultrasonic energy and may stop the operation for a third waiting time WT3set after the third operating time OT3is terminated. In addition, the third piezoelectric part1000cmay repeat a process of operating again during the third operating time OT3after the third waiting time WT3and stopping the operation again during the third waiting time WT3.

In this case, the first piezoelectric part1000aand the third piezoelectric part1000cmay be driven individually. For example, the first piezoelectric part1000aand the third piezoelectric part1000cmay not be driven simultaneously by the switch unit3030, but may operate at different times, respectively. In detail, the first piezoelectric part1000amay operate during the third waiting time WT3of the third piezoelectric part1000c, and the third piezoelectric part1000cmay operate during the first waiting time WT1of the first piezoelectric part1000a.

That is, the first piezoelectric part1000aand the third piezoelectric part1000cmay operate in a time region overlapping the waiting time of other piezoelectric parts by the switch unit3030. The first piezoelectric part1000aand the third piezoelectric part1000cmay repeat the process until a set time of the skin care device1or a forced termination time of the user.

The first operating time OT1and the first waiting time WT1may be the same or different from each other. The third operating time OT3and the third waiting time WT3may be the same or different from each other. In addition, the first operating time OT1may be shorter than or equal to the third waiting time WT3, and the third operating time OT3may be shorter or equal to the first waiting time WT1.

The first waiting time WT1and the third waiting time WT3may be very short. In detail, the first waiting time WT1and the third waiting time WT3may be times that the user may not recognize. For example, the first waiting time WT1and the third waiting time WT3may be several milliseconds (ms) to several tens of milliseconds. Accordingly, the user using the skin care device1may recognize that ultrasonic energy is continuously provided to the skin regions corresponding to the first piezoelectric part1000aand the third piezoelectric part1000c.

That is, the skin care device1according to the embodiment may apply an optimal input waveform to each of the piezoelectric parts1000selected by the user. In detail, the skin care device1may independently control each of the piezoelectric parts1000aand1000cselected by a simple structure including one transmission path (TX path) disposed between the microcontroller unit3010and the switch unit3030.

Accordingly, the piezoelectric parts1000aand1000cmay be provided with operation waveforms, such as voltages, frequencies, and pulse widths, which are the same or different from each other. Accordingly, the piezoelectric parts1000aand1000cmay effectively care or treat the skin and minimize skin stimulation by providing optimal ultrasonic energy to the user's skin.

As still another example, in the operation of selecting the region and intensity, the user may select all of the first to third buttons3211,3212, and3213as shown inFIG. 25or select the fourth button3214. In this case, the switch unit3030may switch the first to third piezoelectric parts1000a,10b, and1000cto an ON state. Accordingly, each of the first to third piezoelectric parts1000a,1000b, and1000cmay be provided with an operation waveform such as a voltage of an intensity set by the user, a frequency, and a pulse width.

In this case, the first to third piezoelectric parts1000a,1000b, and1000cmay operate while repeating ON and OFF as shown inFIG. 9. In detail, the first piezoelectric part1000amay be operated for the first operating time OT1set by the switch unit3030to emit ultrasonic energy and may stop the operation for the first waiting time WT1set after the first operating time OT1is terminated. In addition, the first piezoelectric part1000amay repeat a process of operating again during the first operating time OT1after the first waiting time WT1and stopping the operation again during the first waiting time WT1.

In addition, the second piezoelectric part1000bmay operate for a set second operating time OT2set by the switch unit3030to emit ultrasonic energy and may stop the operation for a second waiting time WT2set after the second operating time OT2is terminated. In addition, the second piezoelectric part1000bmay repeat a process of operating again during the second operating time OT2after the second waiting time WT2and stopping the operation again during the second waiting time WT2.

In addition, the third piezoelectric part1000cMay Operate for a third Operating time OT3set by the switch unit3030to emit ultrasonic energy and may stop the operation for a third waiting time WT3set after the third operating time OT3is terminated. In addition, the third piezoelectric part1000cmay repeat a process of operating again during the third operating time OT3after the third waiting time WT3and stopping the operation again during the third waiting time WT3.

In this case, the first to third piezoelectric parts1000a,1000b, and1000cmay be driven individually. For example, the first to third piezoelectric parts1000a,1000b, and1000cmay not be driven simultaneously by the switch unit3030, but may operate at different times, respectively.

In addition, the piezoelectric part1000may operate with an order set by the switch unit3030as one cycle. For example, the piezoelectric part1000may repeatedly operate for a set time with an order of the first piezoelectric part1000a, the second piezoelectric part1000b, and the third piezoelectric part1000cas one cycle.

The first piezoelectric part1000amay operate in a time domain overlapping the second waiting time WT2and the third waiting time WT3. That is, the first operating time OT1of the first piezoelectric part1000amay overlap the second and third waiting times WT2and WT3in the time domain. In addition, the second piezoelectric part1000bmay operate in a time domain overlapping the first waiting time WT1and the third waiting time WT3. That is, the second operating time OT2of the second piezoelectric part1000bmay overlap the first and third waiting times WT1and WT3in the time domain. In addition, the third piezoelectric part1000cmay operate in a time domain overlapping the first waiting time WT1and the second waiting time WT2. That is, the third operating time OT3of the third piezoelectric part1000cmay overlap the first and second waiting times WT1and WT2in the time domain.

In summary, each of the first to third piezoelectric parts1000a,1000b, and1000cmay operate in a time domain overlapping the waiting time of other piezoelectric parts by the switch unit3030. The first to third piezoelectric parts1000a,1000b, and1000cmay repeat the process until a set time of the skin care device1or a forced termination time of the user.

The first operating time OT1may be shorter than or equal to the first waiting time WT1. The second operating time OT2may be shorter than or equal to the second waiting time WT2. The third operating time OT3may be shorter than or equal to the third waiting time WT3. Preferably, the first to third operation times OT1, OT2, and OT3may be shorter than the corresponding first to third waiting times WT1, WT2, and WT3, respectively, for optimal input waveform application.

In addition, the first operating time OT1may be shorter than the second waiting time WT2and the third waiting time WT3. The second operating time OT2may be shorter than the first waiting time WT1and the third waiting time WT3. The third operating time OT3may be shorter than the first waiting time WT1and the second waiting time WT2.

In addition, the first waiting time WT1may correspond to a sum of the second operating time OT2and the third operating time OT3. The second waiting time WT2may correspond to a sum of the first operating time OT1and the third operating time OT3. The third waiting time WT3may correspond to a sum of the first operating time OT1and the second operating time OT2. That is, the waiting time of the selected one piezoelectric part among the plurality of piezoelectric parts1000may correspond to a sum of operation times of the remaining piezoelectric parts in order to optimize the input waveform applied to the piezoelectric part.

In addition, the first to third waiting times WT1, WT2, WT3may be the same as each other in order to apply the optimal input waveform to each of the plurality of piezoelectric parts1000, and the first to third operation times OT1, OT2, and OT3may be the same as each other.

The first waiting time WT1, the second waiting time WT2, and the third waiting time WT3may be very short. In detail, each of the first to third waiting times WT1, WT2, and WT3may be times that the user may not recognize. For example, each of the first to third waiting times WT1, WT2, and WT3may be several milliseconds (ms) to several tens of milliseconds. Accordingly, the user using the skin care device1may recognize that ultrasonic energy is continuously provided to the skin regions corresponding to the first to third piezoelectric parts1000a,1000b, and1000c, respectively.

That is, the skin care device1according to the embodiment may apply the optimal input waveform to each of the piezoelectric parts1000selected by the user. In detail, the skin care device1may independently control each of the piezoelectric parts1000a.1000b, and1000cselected by a simple structure including one transmission path (TX path) disposed between the microcontroller unit3010and the switch unit3030.

Accordingly, it is possible to control operation waveforms such as a voltage, a frequency, and a pulse width applied to each of the piezoelectric parts1000a.1000b, and1000c. In detail, the same or different operation waveforms may be provided to each of the piezoelectric parts1000a,1000b, and1000c.

As another example, some of the piezoelectric parts1000a,1000b, and1000cmay be provided with the same operation waveform, and the remaining piezoelectric parts may be provided with different operation waveforms. For example, the same operation waveforms may be provided to the second and third piezoelectric parts1000band1000ccorresponding to both eye rim regions that are relatively sensitive to stimulation. On the other hand, an operation waveform stronger than those of the second and third piezoelectric parts1000band1000cmay be provided to the first piezoelectric part1000acorresponding to the brow region that is relatively insensitive to stimulation. That is, the first piezoelectric part1000amay provide ultrasonic energy stronger than those of the second and third piezoelectric parts1000band1000cto the user's skin.

Therefore, the skin care device1may effectively care and treat by providing optimal ultrasound energy according to the user's skin region, and may prevent stimulation by applying a relatively strong ultrasound to the skin region sensitive to stimulation.

The characteristics, structures, effects, and the like described in the above-described embodiments are included in at least one embodiment of the present invention, but are not limited to only one embodiment. Furthermore, the characteristic, structure, and effect illustrated in each embodiment may be combined or modified for other embodiments by a person skilled in the art. Therefore, it should be construed that the contents related to such combination and modification are included in the scope of the present invention.

In addition, the above description has been focused on the embodiments, but it is merely illustrative and does not limit the present invention. Those skilled in the art to which the embodiments pertain may appreciate that various modifications and applications not illustrated above are possible without departing from the essential features of the embodiment. For example, each component particularly represented in the embodiments may be modified and realized. In addition, it should be construed that differences related to such a modification and an application are included in the scope of the present invention defined in the appended claims.